SemaDecl.cpp revision f037541d5c7dcf3553cf26e4b047be869980c23a
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/ASTConsumer.h" 22#include "clang/AST/ASTContext.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclCXX.h" 25#include "clang/AST/DeclObjC.h" 26#include "clang/AST/DeclTemplate.h" 27#include "clang/AST/EvaluatedExprVisitor.h" 28#include "clang/AST/ExprCXX.h" 29#include "clang/AST/StmtCXX.h" 30#include "clang/AST/CharUnits.h" 31#include "clang/Sema/DeclSpec.h" 32#include "clang/Sema/ParsedTemplate.h" 33#include "clang/Parse/ParseDiagnostic.h" 34#include "clang/Basic/PartialDiagnostic.h" 35#include "clang/Sema/DelayedDiagnostic.h" 36#include "clang/Basic/SourceManager.h" 37#include "clang/Basic/TargetInfo.h" 38// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 39#include "clang/Lex/Preprocessor.h" 40#include "clang/Lex/HeaderSearch.h" 41#include "clang/Lex/ModuleLoader.h" 42#include "llvm/ADT/Triple.h" 43#include <algorithm> 44#include <cstring> 45#include <functional> 46using namespace clang; 47using namespace sema; 48 49Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 50 if (OwnedType) { 51 Decl *Group[2] = { OwnedType, Ptr }; 52 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 53 } 54 55 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 56} 57 58/// \brief If the identifier refers to a type name within this scope, 59/// return the declaration of that type. 60/// 61/// This routine performs ordinary name lookup of the identifier II 62/// within the given scope, with optional C++ scope specifier SS, to 63/// determine whether the name refers to a type. If so, returns an 64/// opaque pointer (actually a QualType) corresponding to that 65/// type. Otherwise, returns NULL. 66/// 67/// If name lookup results in an ambiguity, this routine will complain 68/// and then return NULL. 69ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 70 Scope *S, CXXScopeSpec *SS, 71 bool isClassName, bool HasTrailingDot, 72 ParsedType ObjectTypePtr, 73 bool WantNontrivialTypeSourceInfo, 74 IdentifierInfo **CorrectedII) { 75 // Determine where we will perform name lookup. 76 DeclContext *LookupCtx = 0; 77 if (ObjectTypePtr) { 78 QualType ObjectType = ObjectTypePtr.get(); 79 if (ObjectType->isRecordType()) 80 LookupCtx = computeDeclContext(ObjectType); 81 } else if (SS && SS->isNotEmpty()) { 82 LookupCtx = computeDeclContext(*SS, false); 83 84 if (!LookupCtx) { 85 if (isDependentScopeSpecifier(*SS)) { 86 // C++ [temp.res]p3: 87 // A qualified-id that refers to a type and in which the 88 // nested-name-specifier depends on a template-parameter (14.6.2) 89 // shall be prefixed by the keyword typename to indicate that the 90 // qualified-id denotes a type, forming an 91 // elaborated-type-specifier (7.1.5.3). 92 // 93 // We therefore do not perform any name lookup if the result would 94 // refer to a member of an unknown specialization. 95 if (!isClassName) 96 return ParsedType(); 97 98 // We know from the grammar that this name refers to a type, 99 // so build a dependent node to describe the type. 100 if (WantNontrivialTypeSourceInfo) 101 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 102 103 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 104 QualType T = 105 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 106 II, NameLoc); 107 108 return ParsedType::make(T); 109 } 110 111 return ParsedType(); 112 } 113 114 if (!LookupCtx->isDependentContext() && 115 RequireCompleteDeclContext(*SS, LookupCtx)) 116 return ParsedType(); 117 } 118 119 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 120 // lookup for class-names. 121 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 122 LookupOrdinaryName; 123 LookupResult Result(*this, &II, NameLoc, Kind); 124 if (LookupCtx) { 125 // Perform "qualified" name lookup into the declaration context we 126 // computed, which is either the type of the base of a member access 127 // expression or the declaration context associated with a prior 128 // nested-name-specifier. 129 LookupQualifiedName(Result, LookupCtx); 130 131 if (ObjectTypePtr && Result.empty()) { 132 // C++ [basic.lookup.classref]p3: 133 // If the unqualified-id is ~type-name, the type-name is looked up 134 // in the context of the entire postfix-expression. If the type T of 135 // the object expression is of a class type C, the type-name is also 136 // looked up in the scope of class C. At least one of the lookups shall 137 // find a name that refers to (possibly cv-qualified) T. 138 LookupName(Result, S); 139 } 140 } else { 141 // Perform unqualified name lookup. 142 LookupName(Result, S); 143 } 144 145 NamedDecl *IIDecl = 0; 146 switch (Result.getResultKind()) { 147 case LookupResult::NotFound: 148 case LookupResult::NotFoundInCurrentInstantiation: 149 if (CorrectedII) { 150 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), 151 Kind, S, SS, 0, false, 152 Sema::CTC_Type); 153 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); 154 TemplateTy Template; 155 bool MemberOfUnknownSpecialization; 156 UnqualifiedId TemplateName; 157 TemplateName.setIdentifier(NewII, NameLoc); 158 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); 159 CXXScopeSpec NewSS, *NewSSPtr = SS; 160 if (SS && NNS) { 161 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); 162 NewSSPtr = &NewSS; 163 } 164 if (Correction && (NNS || NewII != &II) && 165 // Ignore a correction to a template type as the to-be-corrected 166 // identifier is not a template (typo correction for template names 167 // is handled elsewhere). 168 !(getLangOptions().CPlusPlus && NewSSPtr && 169 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(), 170 false, Template, MemberOfUnknownSpecialization))) { 171 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, 172 isClassName, HasTrailingDot, ObjectTypePtr, 173 WantNontrivialTypeSourceInfo); 174 if (Ty) { 175 std::string CorrectedStr(Correction.getAsString(getLangOptions())); 176 std::string CorrectedQuotedStr( 177 Correction.getQuoted(getLangOptions())); 178 Diag(NameLoc, diag::err_unknown_typename_suggest) 179 << Result.getLookupName() << CorrectedQuotedStr 180 << FixItHint::CreateReplacement(SourceRange(NameLoc), 181 CorrectedStr); 182 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl()) 183 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 184 << CorrectedQuotedStr; 185 186 if (SS && NNS) 187 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); 188 *CorrectedII = NewII; 189 return Ty; 190 } 191 } 192 } 193 // If typo correction failed or was not performed, fall through 194 case LookupResult::FoundOverloaded: 195 case LookupResult::FoundUnresolvedValue: 196 Result.suppressDiagnostics(); 197 return ParsedType(); 198 199 case LookupResult::Ambiguous: 200 // Recover from type-hiding ambiguities by hiding the type. We'll 201 // do the lookup again when looking for an object, and we can 202 // diagnose the error then. If we don't do this, then the error 203 // about hiding the type will be immediately followed by an error 204 // that only makes sense if the identifier was treated like a type. 205 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 206 Result.suppressDiagnostics(); 207 return ParsedType(); 208 } 209 210 // Look to see if we have a type anywhere in the list of results. 211 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 212 Res != ResEnd; ++Res) { 213 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 214 if (!IIDecl || 215 (*Res)->getLocation().getRawEncoding() < 216 IIDecl->getLocation().getRawEncoding()) 217 IIDecl = *Res; 218 } 219 } 220 221 if (!IIDecl) { 222 // None of the entities we found is a type, so there is no way 223 // to even assume that the result is a type. In this case, don't 224 // complain about the ambiguity. The parser will either try to 225 // perform this lookup again (e.g., as an object name), which 226 // will produce the ambiguity, or will complain that it expected 227 // a type name. 228 Result.suppressDiagnostics(); 229 return ParsedType(); 230 } 231 232 // We found a type within the ambiguous lookup; diagnose the 233 // ambiguity and then return that type. This might be the right 234 // answer, or it might not be, but it suppresses any attempt to 235 // perform the name lookup again. 236 break; 237 238 case LookupResult::Found: 239 IIDecl = Result.getFoundDecl(); 240 break; 241 } 242 243 assert(IIDecl && "Didn't find decl"); 244 245 QualType T; 246 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 247 DiagnoseUseOfDecl(IIDecl, NameLoc); 248 249 if (T.isNull()) 250 T = Context.getTypeDeclType(TD); 251 252 if (SS && SS->isNotEmpty()) { 253 if (WantNontrivialTypeSourceInfo) { 254 // Construct a type with type-source information. 255 TypeLocBuilder Builder; 256 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 257 258 T = getElaboratedType(ETK_None, *SS, T); 259 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 260 ElabTL.setKeywordLoc(SourceLocation()); 261 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 262 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 263 } else { 264 T = getElaboratedType(ETK_None, *SS, T); 265 } 266 } 267 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 268 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 269 if (!HasTrailingDot) 270 T = Context.getObjCInterfaceType(IDecl); 271 } 272 273 if (T.isNull()) { 274 // If it's not plausibly a type, suppress diagnostics. 275 Result.suppressDiagnostics(); 276 return ParsedType(); 277 } 278 return ParsedType::make(T); 279} 280 281/// isTagName() - This method is called *for error recovery purposes only* 282/// to determine if the specified name is a valid tag name ("struct foo"). If 283/// so, this returns the TST for the tag corresponding to it (TST_enum, 284/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 285/// where the user forgot to specify the tag. 286DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 287 // Do a tag name lookup in this scope. 288 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 289 LookupName(R, S, false); 290 R.suppressDiagnostics(); 291 if (R.getResultKind() == LookupResult::Found) 292 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 293 switch (TD->getTagKind()) { 294 default: return DeclSpec::TST_unspecified; 295 case TTK_Struct: return DeclSpec::TST_struct; 296 case TTK_Union: return DeclSpec::TST_union; 297 case TTK_Class: return DeclSpec::TST_class; 298 case TTK_Enum: return DeclSpec::TST_enum; 299 } 300 } 301 302 return DeclSpec::TST_unspecified; 303} 304 305/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 306/// if a CXXScopeSpec's type is equal to the type of one of the base classes 307/// then downgrade the missing typename error to a warning. 308/// This is needed for MSVC compatibility; Example: 309/// @code 310/// template<class T> class A { 311/// public: 312/// typedef int TYPE; 313/// }; 314/// template<class T> class B : public A<T> { 315/// public: 316/// A<T>::TYPE a; // no typename required because A<T> is a base class. 317/// }; 318/// @endcode 319bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 320 if (CurContext->isRecord()) { 321 const Type *Ty = SS->getScopeRep()->getAsType(); 322 323 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 324 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 325 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 326 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 327 return true; 328 return S->isFunctionPrototypeScope(); 329 } 330 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 331} 332 333bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 334 SourceLocation IILoc, 335 Scope *S, 336 CXXScopeSpec *SS, 337 ParsedType &SuggestedType) { 338 // We don't have anything to suggest (yet). 339 SuggestedType = ParsedType(); 340 341 // There may have been a typo in the name of the type. Look up typo 342 // results, in case we have something that we can suggest. 343 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 344 LookupOrdinaryName, S, SS, NULL, 345 false, CTC_Type)) { 346 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 347 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 348 349 if (Corrected.isKeyword()) { 350 // We corrected to a keyword. 351 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 352 Diag(IILoc, diag::err_unknown_typename_suggest) 353 << &II << CorrectedQuotedStr; 354 return true; 355 } else { 356 NamedDecl *Result = Corrected.getCorrectionDecl(); 357 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 358 !Result->isInvalidDecl()) { 359 // We found a similarly-named type or interface; suggest that. 360 if (!SS || !SS->isSet()) 361 Diag(IILoc, diag::err_unknown_typename_suggest) 362 << &II << CorrectedQuotedStr 363 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 364 else if (DeclContext *DC = computeDeclContext(*SS, false)) 365 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 366 << &II << DC << CorrectedQuotedStr << SS->getRange() 367 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 368 else 369 llvm_unreachable("could not have corrected a typo here"); 370 371 Diag(Result->getLocation(), diag::note_previous_decl) 372 << CorrectedQuotedStr; 373 374 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 375 false, false, ParsedType(), 376 /*NonTrivialTypeSourceInfo=*/true); 377 return true; 378 } 379 } 380 } 381 382 if (getLangOptions().CPlusPlus) { 383 // See if II is a class template that the user forgot to pass arguments to. 384 UnqualifiedId Name; 385 Name.setIdentifier(&II, IILoc); 386 CXXScopeSpec EmptySS; 387 TemplateTy TemplateResult; 388 bool MemberOfUnknownSpecialization; 389 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 390 Name, ParsedType(), true, TemplateResult, 391 MemberOfUnknownSpecialization) == TNK_Type_template) { 392 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 393 Diag(IILoc, diag::err_template_missing_args) << TplName; 394 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 395 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 396 << TplDecl->getTemplateParameters()->getSourceRange(); 397 } 398 return true; 399 } 400 } 401 402 // FIXME: Should we move the logic that tries to recover from a missing tag 403 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 404 405 if (!SS || (!SS->isSet() && !SS->isInvalid())) 406 Diag(IILoc, diag::err_unknown_typename) << &II; 407 else if (DeclContext *DC = computeDeclContext(*SS, false)) 408 Diag(IILoc, diag::err_typename_nested_not_found) 409 << &II << DC << SS->getRange(); 410 else if (isDependentScopeSpecifier(*SS)) { 411 unsigned DiagID = diag::err_typename_missing; 412 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS, S)) 413 DiagID = diag::warn_typename_missing; 414 415 Diag(SS->getRange().getBegin(), DiagID) 416 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 417 << SourceRange(SS->getRange().getBegin(), IILoc) 418 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 419 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc) 420 .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, 552 &SS)) { 553 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 554 unsigned QualifiedDiag = diag::err_no_member_suggest; 555 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 556 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 557 558 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 559 NamedDecl *UnderlyingFirstDecl 560 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 561 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 562 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 563 UnqualifiedDiag = diag::err_no_template_suggest; 564 QualifiedDiag = diag::err_no_member_template_suggest; 565 } else if (UnderlyingFirstDecl && 566 (isa<TypeDecl>(UnderlyingFirstDecl) || 567 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 568 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 569 UnqualifiedDiag = diag::err_unknown_typename_suggest; 570 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 571 } 572 573 if (SS.isEmpty()) 574 Diag(NameLoc, UnqualifiedDiag) 575 << Name << CorrectedQuotedStr 576 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 577 else 578 Diag(NameLoc, QualifiedDiag) 579 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 580 << SS.getRange() 581 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 582 583 // Update the name, so that the caller has the new name. 584 Name = Corrected.getCorrectionAsIdentifierInfo(); 585 586 // Also update the LookupResult... 587 // FIXME: This should probably go away at some point 588 Result.clear(); 589 Result.setLookupName(Corrected.getCorrection()); 590 if (FirstDecl) Result.addDecl(FirstDecl); 591 592 // Typo correction corrected to a keyword. 593 if (Corrected.isKeyword()) 594 return Corrected.getCorrectionAsIdentifierInfo(); 595 596 if (FirstDecl) 597 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 598 << CorrectedQuotedStr; 599 600 // If we found an Objective-C instance variable, let 601 // LookupInObjCMethod build the appropriate expression to 602 // reference the ivar. 603 // FIXME: This is a gross hack. 604 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 605 Result.clear(); 606 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 607 return move(E); 608 } 609 610 goto Corrected; 611 } 612 } 613 614 // We failed to correct; just fall through and let the parser deal with it. 615 Result.suppressDiagnostics(); 616 return NameClassification::Unknown(); 617 618 case LookupResult::NotFoundInCurrentInstantiation: 619 // We performed name lookup into the current instantiation, and there were 620 // dependent bases, so we treat this result the same way as any other 621 // dependent nested-name-specifier. 622 623 // C++ [temp.res]p2: 624 // A name used in a template declaration or definition and that is 625 // dependent on a template-parameter is assumed not to name a type 626 // unless the applicable name lookup finds a type name or the name is 627 // qualified by the keyword typename. 628 // 629 // FIXME: If the next token is '<', we might want to ask the parser to 630 // perform some heroics to see if we actually have a 631 // template-argument-list, which would indicate a missing 'template' 632 // keyword here. 633 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 634 635 case LookupResult::Found: 636 case LookupResult::FoundOverloaded: 637 case LookupResult::FoundUnresolvedValue: 638 break; 639 640 case LookupResult::Ambiguous: 641 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 642 hasAnyAcceptableTemplateNames(Result)) { 643 // C++ [temp.local]p3: 644 // A lookup that finds an injected-class-name (10.2) can result in an 645 // ambiguity in certain cases (for example, if it is found in more than 646 // one base class). If all of the injected-class-names that are found 647 // refer to specializations of the same class template, and if the name 648 // is followed by a template-argument-list, the reference refers to the 649 // class template itself and not a specialization thereof, and is not 650 // ambiguous. 651 // 652 // This filtering can make an ambiguous result into an unambiguous one, 653 // so try again after filtering out template names. 654 FilterAcceptableTemplateNames(Result); 655 if (!Result.isAmbiguous()) { 656 IsFilteredTemplateName = true; 657 break; 658 } 659 } 660 661 // Diagnose the ambiguity and return an error. 662 return NameClassification::Error(); 663 } 664 665 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 666 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 667 // C++ [temp.names]p3: 668 // After name lookup (3.4) finds that a name is a template-name or that 669 // an operator-function-id or a literal- operator-id refers to a set of 670 // overloaded functions any member of which is a function template if 671 // this is followed by a <, the < is always taken as the delimiter of a 672 // template-argument-list and never as the less-than operator. 673 if (!IsFilteredTemplateName) 674 FilterAcceptableTemplateNames(Result); 675 676 if (!Result.empty()) { 677 bool IsFunctionTemplate; 678 TemplateName Template; 679 if (Result.end() - Result.begin() > 1) { 680 IsFunctionTemplate = true; 681 Template = Context.getOverloadedTemplateName(Result.begin(), 682 Result.end()); 683 } else { 684 TemplateDecl *TD 685 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 686 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 687 688 if (SS.isSet() && !SS.isInvalid()) 689 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 690 /*TemplateKeyword=*/false, 691 TD); 692 else 693 Template = TemplateName(TD); 694 } 695 696 if (IsFunctionTemplate) { 697 // Function templates always go through overload resolution, at which 698 // point we'll perform the various checks (e.g., accessibility) we need 699 // to based on which function we selected. 700 Result.suppressDiagnostics(); 701 702 return NameClassification::FunctionTemplate(Template); 703 } 704 705 return NameClassification::TypeTemplate(Template); 706 } 707 } 708 709 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 710 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 711 DiagnoseUseOfDecl(Type, NameLoc); 712 QualType T = Context.getTypeDeclType(Type); 713 return ParsedType::make(T); 714 } 715 716 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 717 if (!Class) { 718 // FIXME: It's unfortunate that we don't have a Type node for handling this. 719 if (ObjCCompatibleAliasDecl *Alias 720 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 721 Class = Alias->getClassInterface(); 722 } 723 724 if (Class) { 725 DiagnoseUseOfDecl(Class, NameLoc); 726 727 if (NextToken.is(tok::period)) { 728 // Interface. <something> is parsed as a property reference expression. 729 // Just return "unknown" as a fall-through for now. 730 Result.suppressDiagnostics(); 731 return NameClassification::Unknown(); 732 } 733 734 QualType T = Context.getObjCInterfaceType(Class); 735 return ParsedType::make(T); 736 } 737 738 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 739 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 740 741 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 742 return BuildDeclarationNameExpr(SS, Result, ADL); 743} 744 745// Determines the context to return to after temporarily entering a 746// context. This depends in an unnecessarily complicated way on the 747// exact ordering of callbacks from the parser. 748DeclContext *Sema::getContainingDC(DeclContext *DC) { 749 750 // Functions defined inline within classes aren't parsed until we've 751 // finished parsing the top-level class, so the top-level class is 752 // the context we'll need to return to. 753 if (isa<FunctionDecl>(DC)) { 754 DC = DC->getLexicalParent(); 755 756 // A function not defined within a class will always return to its 757 // lexical context. 758 if (!isa<CXXRecordDecl>(DC)) 759 return DC; 760 761 // A C++ inline method/friend is parsed *after* the topmost class 762 // it was declared in is fully parsed ("complete"); the topmost 763 // class is the context we need to return to. 764 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 765 DC = RD; 766 767 // Return the declaration context of the topmost class the inline method is 768 // declared in. 769 return DC; 770 } 771 772 return DC->getLexicalParent(); 773} 774 775void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 776 assert(getContainingDC(DC) == CurContext && 777 "The next DeclContext should be lexically contained in the current one."); 778 CurContext = DC; 779 S->setEntity(DC); 780} 781 782void Sema::PopDeclContext() { 783 assert(CurContext && "DeclContext imbalance!"); 784 785 CurContext = getContainingDC(CurContext); 786 assert(CurContext && "Popped translation unit!"); 787} 788 789/// EnterDeclaratorContext - Used when we must lookup names in the context 790/// of a declarator's nested name specifier. 791/// 792void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 793 // C++0x [basic.lookup.unqual]p13: 794 // A name used in the definition of a static data member of class 795 // X (after the qualified-id of the static member) is looked up as 796 // if the name was used in a member function of X. 797 // C++0x [basic.lookup.unqual]p14: 798 // If a variable member of a namespace is defined outside of the 799 // scope of its namespace then any name used in the definition of 800 // the variable member (after the declarator-id) is looked up as 801 // if the definition of the variable member occurred in its 802 // namespace. 803 // Both of these imply that we should push a scope whose context 804 // is the semantic context of the declaration. We can't use 805 // PushDeclContext here because that context is not necessarily 806 // lexically contained in the current context. Fortunately, 807 // the containing scope should have the appropriate information. 808 809 assert(!S->getEntity() && "scope already has entity"); 810 811#ifndef NDEBUG 812 Scope *Ancestor = S->getParent(); 813 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 814 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 815#endif 816 817 CurContext = DC; 818 S->setEntity(DC); 819} 820 821void Sema::ExitDeclaratorContext(Scope *S) { 822 assert(S->getEntity() == CurContext && "Context imbalance!"); 823 824 // Switch back to the lexical context. The safety of this is 825 // enforced by an assert in EnterDeclaratorContext. 826 Scope *Ancestor = S->getParent(); 827 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 828 CurContext = (DeclContext*) Ancestor->getEntity(); 829 830 // We don't need to do anything with the scope, which is going to 831 // disappear. 832} 833 834 835void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 836 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 837 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 838 // We assume that the caller has already called 839 // ActOnReenterTemplateScope 840 FD = TFD->getTemplatedDecl(); 841 } 842 if (!FD) 843 return; 844 845 PushDeclContext(S, FD); 846 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 847 ParmVarDecl *Param = FD->getParamDecl(P); 848 // If the parameter has an identifier, then add it to the scope 849 if (Param->getIdentifier()) { 850 S->AddDecl(Param); 851 IdResolver.AddDecl(Param); 852 } 853 } 854} 855 856 857/// \brief Determine whether we allow overloading of the function 858/// PrevDecl with another declaration. 859/// 860/// This routine determines whether overloading is possible, not 861/// whether some new function is actually an overload. It will return 862/// true in C++ (where we can always provide overloads) or, as an 863/// extension, in C when the previous function is already an 864/// overloaded function declaration or has the "overloadable" 865/// attribute. 866static bool AllowOverloadingOfFunction(LookupResult &Previous, 867 ASTContext &Context) { 868 if (Context.getLangOptions().CPlusPlus) 869 return true; 870 871 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 872 return true; 873 874 return (Previous.getResultKind() == LookupResult::Found 875 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 876} 877 878/// Add this decl to the scope shadowed decl chains. 879void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 880 // Move up the scope chain until we find the nearest enclosing 881 // non-transparent context. The declaration will be introduced into this 882 // scope. 883 while (S->getEntity() && 884 ((DeclContext *)S->getEntity())->isTransparentContext()) 885 S = S->getParent(); 886 887 // Add scoped declarations into their context, so that they can be 888 // found later. Declarations without a context won't be inserted 889 // into any context. 890 if (AddToContext) 891 CurContext->addDecl(D); 892 893 // Out-of-line definitions shouldn't be pushed into scope in C++. 894 // Out-of-line variable and function definitions shouldn't even in C. 895 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 896 D->isOutOfLine() && 897 !D->getDeclContext()->getRedeclContext()->Equals( 898 D->getLexicalDeclContext()->getRedeclContext())) 899 return; 900 901 // Template instantiations should also not be pushed into scope. 902 if (isa<FunctionDecl>(D) && 903 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 904 return; 905 906 // If this replaces anything in the current scope, 907 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 908 IEnd = IdResolver.end(); 909 for (; I != IEnd; ++I) { 910 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 911 S->RemoveDecl(*I); 912 IdResolver.RemoveDecl(*I); 913 914 // Should only need to replace one decl. 915 break; 916 } 917 } 918 919 S->AddDecl(D); 920 921 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 922 // Implicitly-generated labels may end up getting generated in an order that 923 // isn't strictly lexical, which breaks name lookup. Be careful to insert 924 // the label at the appropriate place in the identifier chain. 925 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 926 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 927 if (IDC == CurContext) { 928 if (!S->isDeclScope(*I)) 929 continue; 930 } else if (IDC->Encloses(CurContext)) 931 break; 932 } 933 934 IdResolver.InsertDeclAfter(I, D); 935 } else { 936 IdResolver.AddDecl(D); 937 } 938} 939 940void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) { 941 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope) 942 TUScope->AddDecl(D); 943} 944 945bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 946 bool ExplicitInstantiationOrSpecialization) { 947 return IdResolver.isDeclInScope(D, Ctx, Context, S, 948 ExplicitInstantiationOrSpecialization); 949} 950 951Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 952 DeclContext *TargetDC = DC->getPrimaryContext(); 953 do { 954 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 955 if (ScopeDC->getPrimaryContext() == TargetDC) 956 return S; 957 } while ((S = S->getParent())); 958 959 return 0; 960} 961 962static bool isOutOfScopePreviousDeclaration(NamedDecl *, 963 DeclContext*, 964 ASTContext&); 965 966/// Filters out lookup results that don't fall within the given scope 967/// as determined by isDeclInScope. 968void Sema::FilterLookupForScope(LookupResult &R, 969 DeclContext *Ctx, Scope *S, 970 bool ConsiderLinkage, 971 bool ExplicitInstantiationOrSpecialization) { 972 LookupResult::Filter F = R.makeFilter(); 973 while (F.hasNext()) { 974 NamedDecl *D = F.next(); 975 976 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 977 continue; 978 979 if (ConsiderLinkage && 980 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 981 continue; 982 983 F.erase(); 984 } 985 986 F.done(); 987} 988 989static bool isUsingDecl(NamedDecl *D) { 990 return isa<UsingShadowDecl>(D) || 991 isa<UnresolvedUsingTypenameDecl>(D) || 992 isa<UnresolvedUsingValueDecl>(D); 993} 994 995/// Removes using shadow declarations from the lookup results. 996static void RemoveUsingDecls(LookupResult &R) { 997 LookupResult::Filter F = R.makeFilter(); 998 while (F.hasNext()) 999 if (isUsingDecl(F.next())) 1000 F.erase(); 1001 1002 F.done(); 1003} 1004 1005/// \brief Check for this common pattern: 1006/// @code 1007/// class S { 1008/// S(const S&); // DO NOT IMPLEMENT 1009/// void operator=(const S&); // DO NOT IMPLEMENT 1010/// }; 1011/// @endcode 1012static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1013 // FIXME: Should check for private access too but access is set after we get 1014 // the decl here. 1015 if (D->doesThisDeclarationHaveABody()) 1016 return false; 1017 1018 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1019 return CD->isCopyConstructor(); 1020 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1021 return Method->isCopyAssignmentOperator(); 1022 return false; 1023} 1024 1025bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1026 assert(D); 1027 1028 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1029 return false; 1030 1031 // Ignore class templates. 1032 if (D->getDeclContext()->isDependentContext() || 1033 D->getLexicalDeclContext()->isDependentContext()) 1034 return false; 1035 1036 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1037 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1038 return false; 1039 1040 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1041 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1042 return false; 1043 } else { 1044 // 'static inline' functions are used in headers; don't warn. 1045 if (FD->getStorageClass() == SC_Static && 1046 FD->isInlineSpecified()) 1047 return false; 1048 } 1049 1050 if (FD->doesThisDeclarationHaveABody() && 1051 Context.DeclMustBeEmitted(FD)) 1052 return false; 1053 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1054 if (!VD->isFileVarDecl() || 1055 VD->getType().isConstant(Context) || 1056 Context.DeclMustBeEmitted(VD)) 1057 return false; 1058 1059 if (VD->isStaticDataMember() && 1060 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1061 return false; 1062 1063 } else { 1064 return false; 1065 } 1066 1067 // Only warn for unused decls internal to the translation unit. 1068 if (D->getLinkage() == ExternalLinkage) 1069 return false; 1070 1071 return true; 1072} 1073 1074void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1075 if (!D) 1076 return; 1077 1078 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1079 const FunctionDecl *First = FD->getFirstDeclaration(); 1080 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1081 return; // First should already be in the vector. 1082 } 1083 1084 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1085 const VarDecl *First = VD->getFirstDeclaration(); 1086 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1087 return; // First should already be in the vector. 1088 } 1089 1090 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1091 UnusedFileScopedDecls.push_back(D); 1092 } 1093 1094static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1095 if (D->isInvalidDecl()) 1096 return false; 1097 1098 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1099 return false; 1100 1101 if (isa<LabelDecl>(D)) 1102 return true; 1103 1104 // White-list anything that isn't a local variable. 1105 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1106 !D->getDeclContext()->isFunctionOrMethod()) 1107 return false; 1108 1109 // Types of valid local variables should be complete, so this should succeed. 1110 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1111 1112 // White-list anything with an __attribute__((unused)) type. 1113 QualType Ty = VD->getType(); 1114 1115 // Only look at the outermost level of typedef. 1116 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1117 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1118 return false; 1119 } 1120 1121 // If we failed to complete the type for some reason, or if the type is 1122 // dependent, don't diagnose the variable. 1123 if (Ty->isIncompleteType() || Ty->isDependentType()) 1124 return false; 1125 1126 if (const TagType *TT = Ty->getAs<TagType>()) { 1127 const TagDecl *Tag = TT->getDecl(); 1128 if (Tag->hasAttr<UnusedAttr>()) 1129 return false; 1130 1131 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1132 if (!RD->hasTrivialDestructor()) 1133 return false; 1134 1135 if (const Expr *Init = VD->getInit()) { 1136 const CXXConstructExpr *Construct = 1137 dyn_cast<CXXConstructExpr>(Init); 1138 if (Construct && !Construct->isElidable()) { 1139 CXXConstructorDecl *CD = Construct->getConstructor(); 1140 if (!CD->isTrivial()) 1141 return false; 1142 } 1143 } 1144 } 1145 } 1146 1147 // TODO: __attribute__((unused)) templates? 1148 } 1149 1150 return true; 1151} 1152 1153static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1154 FixItHint &Hint) { 1155 if (isa<LabelDecl>(D)) { 1156 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1157 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1158 if (AfterColon.isInvalid()) 1159 return; 1160 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1161 getCharRange(D->getLocStart(), AfterColon)); 1162 } 1163 return; 1164} 1165 1166/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1167/// unless they are marked attr(unused). 1168void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1169 FixItHint Hint; 1170 if (!ShouldDiagnoseUnusedDecl(D)) 1171 return; 1172 1173 GenerateFixForUnusedDecl(D, Context, Hint); 1174 1175 unsigned DiagID; 1176 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1177 DiagID = diag::warn_unused_exception_param; 1178 else if (isa<LabelDecl>(D)) 1179 DiagID = diag::warn_unused_label; 1180 else 1181 DiagID = diag::warn_unused_variable; 1182 1183 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1184} 1185 1186static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1187 // Verify that we have no forward references left. If so, there was a goto 1188 // or address of a label taken, but no definition of it. Label fwd 1189 // definitions are indicated with a null substmt. 1190 if (L->getStmt() == 0) 1191 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1192} 1193 1194void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1195 if (S->decl_empty()) return; 1196 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1197 "Scope shouldn't contain decls!"); 1198 1199 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1200 I != E; ++I) { 1201 Decl *TmpD = (*I); 1202 assert(TmpD && "This decl didn't get pushed??"); 1203 1204 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1205 NamedDecl *D = cast<NamedDecl>(TmpD); 1206 1207 if (!D->getDeclName()) continue; 1208 1209 // Diagnose unused variables in this scope. 1210 if (!S->hasErrorOccurred()) 1211 DiagnoseUnusedDecl(D); 1212 1213 // If this was a forward reference to a label, verify it was defined. 1214 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1215 CheckPoppedLabel(LD, *this); 1216 1217 // Remove this name from our lexical scope. 1218 IdResolver.RemoveDecl(D); 1219 } 1220} 1221 1222/// \brief Look for an Objective-C class in the translation unit. 1223/// 1224/// \param Id The name of the Objective-C class we're looking for. If 1225/// typo-correction fixes this name, the Id will be updated 1226/// to the fixed name. 1227/// 1228/// \param IdLoc The location of the name in the translation unit. 1229/// 1230/// \param TypoCorrection If true, this routine will attempt typo correction 1231/// if there is no class with the given name. 1232/// 1233/// \returns The declaration of the named Objective-C class, or NULL if the 1234/// class could not be found. 1235ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1236 SourceLocation IdLoc, 1237 bool DoTypoCorrection) { 1238 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1239 // creation from this context. 1240 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1241 1242 if (!IDecl && DoTypoCorrection) { 1243 // Perform typo correction at the given location, but only if we 1244 // find an Objective-C class name. 1245 TypoCorrection C; 1246 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1247 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1248 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1249 Diag(IdLoc, diag::err_undef_interface_suggest) 1250 << Id << IDecl->getDeclName() 1251 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1252 Diag(IDecl->getLocation(), diag::note_previous_decl) 1253 << IDecl->getDeclName(); 1254 1255 Id = IDecl->getIdentifier(); 1256 } 1257 } 1258 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1259 // This routine must always return a class definition, if any. 1260 if (Def && Def->getDefinition()) 1261 Def = Def->getDefinition(); 1262 return Def; 1263} 1264 1265/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1266/// from S, where a non-field would be declared. This routine copes 1267/// with the difference between C and C++ scoping rules in structs and 1268/// unions. For example, the following code is well-formed in C but 1269/// ill-formed in C++: 1270/// @code 1271/// struct S6 { 1272/// enum { BAR } e; 1273/// }; 1274/// 1275/// void test_S6() { 1276/// struct S6 a; 1277/// a.e = BAR; 1278/// } 1279/// @endcode 1280/// For the declaration of BAR, this routine will return a different 1281/// scope. The scope S will be the scope of the unnamed enumeration 1282/// within S6. In C++, this routine will return the scope associated 1283/// with S6, because the enumeration's scope is a transparent 1284/// context but structures can contain non-field names. In C, this 1285/// routine will return the translation unit scope, since the 1286/// enumeration's scope is a transparent context and structures cannot 1287/// contain non-field names. 1288Scope *Sema::getNonFieldDeclScope(Scope *S) { 1289 while (((S->getFlags() & Scope::DeclScope) == 0) || 1290 (S->getEntity() && 1291 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1292 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1293 S = S->getParent(); 1294 return S; 1295} 1296 1297/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1298/// file scope. lazily create a decl for it. ForRedeclaration is true 1299/// if we're creating this built-in in anticipation of redeclaring the 1300/// built-in. 1301NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1302 Scope *S, bool ForRedeclaration, 1303 SourceLocation Loc) { 1304 Builtin::ID BID = (Builtin::ID)bid; 1305 1306 ASTContext::GetBuiltinTypeError Error; 1307 QualType R = Context.GetBuiltinType(BID, Error); 1308 switch (Error) { 1309 case ASTContext::GE_None: 1310 // Okay 1311 break; 1312 1313 case ASTContext::GE_Missing_stdio: 1314 if (ForRedeclaration) 1315 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1316 << Context.BuiltinInfo.GetName(BID); 1317 return 0; 1318 1319 case ASTContext::GE_Missing_setjmp: 1320 if (ForRedeclaration) 1321 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1322 << Context.BuiltinInfo.GetName(BID); 1323 return 0; 1324 1325 case ASTContext::GE_Missing_ucontext: 1326 if (ForRedeclaration) 1327 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1328 << Context.BuiltinInfo.GetName(BID); 1329 return 0; 1330 } 1331 1332 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1333 Diag(Loc, diag::ext_implicit_lib_function_decl) 1334 << Context.BuiltinInfo.GetName(BID) 1335 << R; 1336 if (Context.BuiltinInfo.getHeaderName(BID) && 1337 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1338 != DiagnosticsEngine::Ignored) 1339 Diag(Loc, diag::note_please_include_header) 1340 << Context.BuiltinInfo.getHeaderName(BID) 1341 << Context.BuiltinInfo.GetName(BID); 1342 } 1343 1344 FunctionDecl *New = FunctionDecl::Create(Context, 1345 Context.getTranslationUnitDecl(), 1346 Loc, Loc, II, R, /*TInfo=*/0, 1347 SC_Extern, 1348 SC_None, false, 1349 /*hasPrototype=*/true); 1350 New->setImplicit(); 1351 1352 // Create Decl objects for each parameter, adding them to the 1353 // FunctionDecl. 1354 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1355 SmallVector<ParmVarDecl*, 16> Params; 1356 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1357 ParmVarDecl *parm = 1358 ParmVarDecl::Create(Context, New, SourceLocation(), 1359 SourceLocation(), 0, 1360 FT->getArgType(i), /*TInfo=*/0, 1361 SC_None, SC_None, 0); 1362 parm->setScopeInfo(0, i); 1363 Params.push_back(parm); 1364 } 1365 New->setParams(Params); 1366 } 1367 1368 AddKnownFunctionAttributes(New); 1369 1370 // TUScope is the translation-unit scope to insert this function into. 1371 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1372 // relate Scopes to DeclContexts, and probably eliminate CurContext 1373 // entirely, but we're not there yet. 1374 DeclContext *SavedContext = CurContext; 1375 CurContext = Context.getTranslationUnitDecl(); 1376 PushOnScopeChains(New, TUScope); 1377 CurContext = SavedContext; 1378 return New; 1379} 1380 1381bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { 1382 QualType OldType; 1383 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1384 OldType = OldTypedef->getUnderlyingType(); 1385 else 1386 OldType = Context.getTypeDeclType(Old); 1387 QualType NewType = New->getUnderlyingType(); 1388 1389 if (NewType->isVariablyModifiedType()) { 1390 // Must not redefine a typedef with a variably-modified type. 1391 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1392 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef) 1393 << Kind << NewType; 1394 if (Old->getLocation().isValid()) 1395 Diag(Old->getLocation(), diag::note_previous_definition); 1396 New->setInvalidDecl(); 1397 return true; 1398 } 1399 1400 if (OldType != NewType && 1401 !OldType->isDependentType() && 1402 !NewType->isDependentType() && 1403 !Context.hasSameType(OldType, NewType)) { 1404 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1405 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1406 << Kind << NewType << OldType; 1407 if (Old->getLocation().isValid()) 1408 Diag(Old->getLocation(), diag::note_previous_definition); 1409 New->setInvalidDecl(); 1410 return true; 1411 } 1412 return false; 1413} 1414 1415/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1416/// same name and scope as a previous declaration 'Old'. Figure out 1417/// how to resolve this situation, merging decls or emitting 1418/// diagnostics as appropriate. If there was an error, set New to be invalid. 1419/// 1420void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1421 // If the new decl is known invalid already, don't bother doing any 1422 // merging checks. 1423 if (New->isInvalidDecl()) return; 1424 1425 // Allow multiple definitions for ObjC built-in typedefs. 1426 // FIXME: Verify the underlying types are equivalent! 1427 if (getLangOptions().ObjC1) { 1428 const IdentifierInfo *TypeID = New->getIdentifier(); 1429 switch (TypeID->getLength()) { 1430 default: break; 1431 case 2: 1432 if (!TypeID->isStr("id")) 1433 break; 1434 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1435 // Install the built-in type for 'id', ignoring the current definition. 1436 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1437 return; 1438 case 5: 1439 if (!TypeID->isStr("Class")) 1440 break; 1441 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1442 // Install the built-in type for 'Class', ignoring the current definition. 1443 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1444 return; 1445 case 3: 1446 if (!TypeID->isStr("SEL")) 1447 break; 1448 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1449 // Install the built-in type for 'SEL', ignoring the current definition. 1450 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1451 return; 1452 } 1453 // Fall through - the typedef name was not a builtin type. 1454 } 1455 1456 // Verify the old decl was also a type. 1457 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1458 if (!Old) { 1459 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1460 << New->getDeclName(); 1461 1462 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1463 if (OldD->getLocation().isValid()) 1464 Diag(OldD->getLocation(), diag::note_previous_definition); 1465 1466 return New->setInvalidDecl(); 1467 } 1468 1469 // If the old declaration is invalid, just give up here. 1470 if (Old->isInvalidDecl()) 1471 return New->setInvalidDecl(); 1472 1473 // If the typedef types are not identical, reject them in all languages and 1474 // with any extensions enabled. 1475 if (isIncompatibleTypedef(Old, New)) 1476 return; 1477 1478 // The types match. Link up the redeclaration chain if the old 1479 // declaration was a typedef. 1480 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1481 New->setPreviousDeclaration(Typedef); 1482 1483 if (getLangOptions().MicrosoftExt) 1484 return; 1485 1486 if (getLangOptions().CPlusPlus) { 1487 // C++ [dcl.typedef]p2: 1488 // In a given non-class scope, a typedef specifier can be used to 1489 // redefine the name of any type declared in that scope to refer 1490 // to the type to which it already refers. 1491 if (!isa<CXXRecordDecl>(CurContext)) 1492 return; 1493 1494 // C++0x [dcl.typedef]p4: 1495 // In a given class scope, a typedef specifier can be used to redefine 1496 // any class-name declared in that scope that is not also a typedef-name 1497 // to refer to the type to which it already refers. 1498 // 1499 // This wording came in via DR424, which was a correction to the 1500 // wording in DR56, which accidentally banned code like: 1501 // 1502 // struct S { 1503 // typedef struct A { } A; 1504 // }; 1505 // 1506 // in the C++03 standard. We implement the C++0x semantics, which 1507 // allow the above but disallow 1508 // 1509 // struct S { 1510 // typedef int I; 1511 // typedef int I; 1512 // }; 1513 // 1514 // since that was the intent of DR56. 1515 if (!isa<TypedefNameDecl>(Old)) 1516 return; 1517 1518 Diag(New->getLocation(), diag::err_redefinition) 1519 << New->getDeclName(); 1520 Diag(Old->getLocation(), diag::note_previous_definition); 1521 return New->setInvalidDecl(); 1522 } 1523 1524 // Modules always permit redefinition of typedefs, as does C11. 1525 if (getLangOptions().Modules || getLangOptions().C11) 1526 return; 1527 1528 // If we have a redefinition of a typedef in C, emit a warning. This warning 1529 // is normally mapped to an error, but can be controlled with 1530 // -Wtypedef-redefinition. If either the original or the redefinition is 1531 // in a system header, don't emit this for compatibility with GCC. 1532 if (getDiagnostics().getSuppressSystemWarnings() && 1533 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1534 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1535 return; 1536 1537 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1538 << New->getDeclName(); 1539 Diag(Old->getLocation(), diag::note_previous_definition); 1540 return; 1541} 1542 1543/// DeclhasAttr - returns true if decl Declaration already has the target 1544/// attribute. 1545static bool 1546DeclHasAttr(const Decl *D, const Attr *A) { 1547 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1548 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1549 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1550 if ((*i)->getKind() == A->getKind()) { 1551 if (Ann) { 1552 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1553 return true; 1554 continue; 1555 } 1556 // FIXME: Don't hardcode this check 1557 if (OA && isa<OwnershipAttr>(*i)) 1558 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1559 return true; 1560 } 1561 1562 return false; 1563} 1564 1565/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1566void Sema::mergeDeclAttributes(Decl *New, Decl *Old, 1567 bool MergeDeprecation) { 1568 if (!Old->hasAttrs()) 1569 return; 1570 1571 bool foundAny = New->hasAttrs(); 1572 1573 // Ensure that any moving of objects within the allocated map is done before 1574 // we process them. 1575 if (!foundAny) New->setAttrs(AttrVec()); 1576 1577 for (specific_attr_iterator<InheritableAttr> 1578 i = Old->specific_attr_begin<InheritableAttr>(), 1579 e = Old->specific_attr_end<InheritableAttr>(); 1580 i != e; ++i) { 1581 // Ignore deprecated/unavailable/availability attributes if requested. 1582 if (!MergeDeprecation && 1583 (isa<DeprecatedAttr>(*i) || 1584 isa<UnavailableAttr>(*i) || 1585 isa<AvailabilityAttr>(*i))) 1586 continue; 1587 1588 if (!DeclHasAttr(New, *i)) { 1589 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(Context)); 1590 newAttr->setInherited(true); 1591 New->addAttr(newAttr); 1592 foundAny = true; 1593 } 1594 } 1595 1596 if (!foundAny) New->dropAttrs(); 1597} 1598 1599/// mergeParamDeclAttributes - Copy attributes from the old parameter 1600/// to the new one. 1601static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1602 const ParmVarDecl *oldDecl, 1603 ASTContext &C) { 1604 if (!oldDecl->hasAttrs()) 1605 return; 1606 1607 bool foundAny = newDecl->hasAttrs(); 1608 1609 // Ensure that any moving of objects within the allocated map is 1610 // done before we process them. 1611 if (!foundAny) newDecl->setAttrs(AttrVec()); 1612 1613 for (specific_attr_iterator<InheritableParamAttr> 1614 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1615 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1616 if (!DeclHasAttr(newDecl, *i)) { 1617 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1618 newAttr->setInherited(true); 1619 newDecl->addAttr(newAttr); 1620 foundAny = true; 1621 } 1622 } 1623 1624 if (!foundAny) newDecl->dropAttrs(); 1625} 1626 1627namespace { 1628 1629/// Used in MergeFunctionDecl to keep track of function parameters in 1630/// C. 1631struct GNUCompatibleParamWarning { 1632 ParmVarDecl *OldParm; 1633 ParmVarDecl *NewParm; 1634 QualType PromotedType; 1635}; 1636 1637} 1638 1639/// getSpecialMember - get the special member enum for a method. 1640Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1641 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1642 if (Ctor->isDefaultConstructor()) 1643 return Sema::CXXDefaultConstructor; 1644 1645 if (Ctor->isCopyConstructor()) 1646 return Sema::CXXCopyConstructor; 1647 1648 if (Ctor->isMoveConstructor()) 1649 return Sema::CXXMoveConstructor; 1650 } else if (isa<CXXDestructorDecl>(MD)) { 1651 return Sema::CXXDestructor; 1652 } else if (MD->isCopyAssignmentOperator()) { 1653 return Sema::CXXCopyAssignment; 1654 } else if (MD->isMoveAssignmentOperator()) { 1655 return Sema::CXXMoveAssignment; 1656 } 1657 1658 return Sema::CXXInvalid; 1659} 1660 1661/// canRedefineFunction - checks if a function can be redefined. Currently, 1662/// only extern inline functions can be redefined, and even then only in 1663/// GNU89 mode. 1664static bool canRedefineFunction(const FunctionDecl *FD, 1665 const LangOptions& LangOpts) { 1666 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1667 !LangOpts.CPlusPlus && 1668 FD->isInlineSpecified() && 1669 FD->getStorageClass() == SC_Extern); 1670} 1671 1672/// MergeFunctionDecl - We just parsed a function 'New' from 1673/// declarator D which has the same name and scope as a previous 1674/// declaration 'Old'. Figure out how to resolve this situation, 1675/// merging decls or emitting diagnostics as appropriate. 1676/// 1677/// In C++, New and Old must be declarations that are not 1678/// overloaded. Use IsOverload to determine whether New and Old are 1679/// overloaded, and to select the Old declaration that New should be 1680/// merged with. 1681/// 1682/// Returns true if there was an error, false otherwise. 1683bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1684 // Verify the old decl was also a function. 1685 FunctionDecl *Old = 0; 1686 if (FunctionTemplateDecl *OldFunctionTemplate 1687 = dyn_cast<FunctionTemplateDecl>(OldD)) 1688 Old = OldFunctionTemplate->getTemplatedDecl(); 1689 else 1690 Old = dyn_cast<FunctionDecl>(OldD); 1691 if (!Old) { 1692 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1693 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1694 Diag(Shadow->getTargetDecl()->getLocation(), 1695 diag::note_using_decl_target); 1696 Diag(Shadow->getUsingDecl()->getLocation(), 1697 diag::note_using_decl) << 0; 1698 return true; 1699 } 1700 1701 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1702 << New->getDeclName(); 1703 Diag(OldD->getLocation(), diag::note_previous_definition); 1704 return true; 1705 } 1706 1707 // Determine whether the previous declaration was a definition, 1708 // implicit declaration, or a declaration. 1709 diag::kind PrevDiag; 1710 if (Old->isThisDeclarationADefinition()) 1711 PrevDiag = diag::note_previous_definition; 1712 else if (Old->isImplicit()) 1713 PrevDiag = diag::note_previous_implicit_declaration; 1714 else 1715 PrevDiag = diag::note_previous_declaration; 1716 1717 QualType OldQType = Context.getCanonicalType(Old->getType()); 1718 QualType NewQType = Context.getCanonicalType(New->getType()); 1719 1720 // Don't complain about this if we're in GNU89 mode and the old function 1721 // is an extern inline function. 1722 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1723 New->getStorageClass() == SC_Static && 1724 Old->getStorageClass() != SC_Static && 1725 !canRedefineFunction(Old, getLangOptions())) { 1726 if (getLangOptions().MicrosoftExt) { 1727 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1728 Diag(Old->getLocation(), PrevDiag); 1729 } else { 1730 Diag(New->getLocation(), diag::err_static_non_static) << New; 1731 Diag(Old->getLocation(), PrevDiag); 1732 return true; 1733 } 1734 } 1735 1736 // If a function is first declared with a calling convention, but is 1737 // later declared or defined without one, the second decl assumes the 1738 // calling convention of the first. 1739 // 1740 // For the new decl, we have to look at the NON-canonical type to tell the 1741 // difference between a function that really doesn't have a calling 1742 // convention and one that is declared cdecl. That's because in 1743 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1744 // because it is the default calling convention. 1745 // 1746 // Note also that we DO NOT return at this point, because we still have 1747 // other tests to run. 1748 const FunctionType *OldType = cast<FunctionType>(OldQType); 1749 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1750 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1751 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1752 bool RequiresAdjustment = false; 1753 if (OldTypeInfo.getCC() != CC_Default && 1754 NewTypeInfo.getCC() == CC_Default) { 1755 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1756 RequiresAdjustment = true; 1757 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1758 NewTypeInfo.getCC())) { 1759 // Calling conventions really aren't compatible, so complain. 1760 Diag(New->getLocation(), diag::err_cconv_change) 1761 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1762 << (OldTypeInfo.getCC() == CC_Default) 1763 << (OldTypeInfo.getCC() == CC_Default ? "" : 1764 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1765 Diag(Old->getLocation(), diag::note_previous_declaration); 1766 return true; 1767 } 1768 1769 // FIXME: diagnose the other way around? 1770 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1771 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1772 RequiresAdjustment = true; 1773 } 1774 1775 // Merge regparm attribute. 1776 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1777 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1778 if (NewTypeInfo.getHasRegParm()) { 1779 Diag(New->getLocation(), diag::err_regparm_mismatch) 1780 << NewType->getRegParmType() 1781 << OldType->getRegParmType(); 1782 Diag(Old->getLocation(), diag::note_previous_declaration); 1783 return true; 1784 } 1785 1786 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1787 RequiresAdjustment = true; 1788 } 1789 1790 // Merge ns_returns_retained attribute. 1791 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1792 if (NewTypeInfo.getProducesResult()) { 1793 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1794 Diag(Old->getLocation(), diag::note_previous_declaration); 1795 return true; 1796 } 1797 1798 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1799 RequiresAdjustment = true; 1800 } 1801 1802 if (RequiresAdjustment) { 1803 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1804 New->setType(QualType(NewType, 0)); 1805 NewQType = Context.getCanonicalType(New->getType()); 1806 } 1807 1808 if (getLangOptions().CPlusPlus) { 1809 // (C++98 13.1p2): 1810 // Certain function declarations cannot be overloaded: 1811 // -- Function declarations that differ only in the return type 1812 // cannot be overloaded. 1813 QualType OldReturnType = OldType->getResultType(); 1814 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1815 QualType ResQT; 1816 if (OldReturnType != NewReturnType) { 1817 if (NewReturnType->isObjCObjectPointerType() 1818 && OldReturnType->isObjCObjectPointerType()) 1819 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1820 if (ResQT.isNull()) { 1821 if (New->isCXXClassMember() && New->isOutOfLine()) 1822 Diag(New->getLocation(), 1823 diag::err_member_def_does_not_match_ret_type) << New; 1824 else 1825 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1826 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1827 return true; 1828 } 1829 else 1830 NewQType = ResQT; 1831 } 1832 1833 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1834 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1835 if (OldMethod && NewMethod) { 1836 // Preserve triviality. 1837 NewMethod->setTrivial(OldMethod->isTrivial()); 1838 1839 // MSVC allows explicit template specialization at class scope: 1840 // 2 CXMethodDecls referring to the same function will be injected. 1841 // We don't want a redeclartion error. 1842 bool IsClassScopeExplicitSpecialization = 1843 OldMethod->isFunctionTemplateSpecialization() && 1844 NewMethod->isFunctionTemplateSpecialization(); 1845 bool isFriend = NewMethod->getFriendObjectKind(); 1846 1847 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1848 !IsClassScopeExplicitSpecialization) { 1849 // -- Member function declarations with the same name and the 1850 // same parameter types cannot be overloaded if any of them 1851 // is a static member function declaration. 1852 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1853 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1854 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1855 return true; 1856 } 1857 1858 // C++ [class.mem]p1: 1859 // [...] A member shall not be declared twice in the 1860 // member-specification, except that a nested class or member 1861 // class template can be declared and then later defined. 1862 unsigned NewDiag; 1863 if (isa<CXXConstructorDecl>(OldMethod)) 1864 NewDiag = diag::err_constructor_redeclared; 1865 else if (isa<CXXDestructorDecl>(NewMethod)) 1866 NewDiag = diag::err_destructor_redeclared; 1867 else if (isa<CXXConversionDecl>(NewMethod)) 1868 NewDiag = diag::err_conv_function_redeclared; 1869 else 1870 NewDiag = diag::err_member_redeclared; 1871 1872 Diag(New->getLocation(), NewDiag); 1873 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1874 1875 // Complain if this is an explicit declaration of a special 1876 // member that was initially declared implicitly. 1877 // 1878 // As an exception, it's okay to befriend such methods in order 1879 // to permit the implicit constructor/destructor/operator calls. 1880 } else if (OldMethod->isImplicit()) { 1881 if (isFriend) { 1882 NewMethod->setImplicit(); 1883 } else { 1884 Diag(NewMethod->getLocation(), 1885 diag::err_definition_of_implicitly_declared_member) 1886 << New << getSpecialMember(OldMethod); 1887 return true; 1888 } 1889 } else if (OldMethod->isExplicitlyDefaulted()) { 1890 Diag(NewMethod->getLocation(), 1891 diag::err_definition_of_explicitly_defaulted_member) 1892 << getSpecialMember(OldMethod); 1893 return true; 1894 } 1895 } 1896 1897 // (C++98 8.3.5p3): 1898 // All declarations for a function shall agree exactly in both the 1899 // return type and the parameter-type-list. 1900 // We also want to respect all the extended bits except noreturn. 1901 1902 // noreturn should now match unless the old type info didn't have it. 1903 QualType OldQTypeForComparison = OldQType; 1904 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1905 assert(OldQType == QualType(OldType, 0)); 1906 const FunctionType *OldTypeForComparison 1907 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1908 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1909 assert(OldQTypeForComparison.isCanonical()); 1910 } 1911 1912 if (OldQTypeForComparison == NewQType) 1913 return MergeCompatibleFunctionDecls(New, Old); 1914 1915 // Fall through for conflicting redeclarations and redefinitions. 1916 } 1917 1918 // C: Function types need to be compatible, not identical. This handles 1919 // duplicate function decls like "void f(int); void f(enum X);" properly. 1920 if (!getLangOptions().CPlusPlus && 1921 Context.typesAreCompatible(OldQType, NewQType)) { 1922 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1923 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1924 const FunctionProtoType *OldProto = 0; 1925 if (isa<FunctionNoProtoType>(NewFuncType) && 1926 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1927 // The old declaration provided a function prototype, but the 1928 // new declaration does not. Merge in the prototype. 1929 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1930 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1931 OldProto->arg_type_end()); 1932 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1933 ParamTypes.data(), ParamTypes.size(), 1934 OldProto->getExtProtoInfo()); 1935 New->setType(NewQType); 1936 New->setHasInheritedPrototype(); 1937 1938 // Synthesize a parameter for each argument type. 1939 SmallVector<ParmVarDecl*, 16> Params; 1940 for (FunctionProtoType::arg_type_iterator 1941 ParamType = OldProto->arg_type_begin(), 1942 ParamEnd = OldProto->arg_type_end(); 1943 ParamType != ParamEnd; ++ParamType) { 1944 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1945 SourceLocation(), 1946 SourceLocation(), 0, 1947 *ParamType, /*TInfo=*/0, 1948 SC_None, SC_None, 1949 0); 1950 Param->setScopeInfo(0, Params.size()); 1951 Param->setImplicit(); 1952 Params.push_back(Param); 1953 } 1954 1955 New->setParams(Params); 1956 } 1957 1958 return MergeCompatibleFunctionDecls(New, Old); 1959 } 1960 1961 // GNU C permits a K&R definition to follow a prototype declaration 1962 // if the declared types of the parameters in the K&R definition 1963 // match the types in the prototype declaration, even when the 1964 // promoted types of the parameters from the K&R definition differ 1965 // from the types in the prototype. GCC then keeps the types from 1966 // the prototype. 1967 // 1968 // If a variadic prototype is followed by a non-variadic K&R definition, 1969 // the K&R definition becomes variadic. This is sort of an edge case, but 1970 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1971 // C99 6.9.1p8. 1972 if (!getLangOptions().CPlusPlus && 1973 Old->hasPrototype() && !New->hasPrototype() && 1974 New->getType()->getAs<FunctionProtoType>() && 1975 Old->getNumParams() == New->getNumParams()) { 1976 SmallVector<QualType, 16> ArgTypes; 1977 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1978 const FunctionProtoType *OldProto 1979 = Old->getType()->getAs<FunctionProtoType>(); 1980 const FunctionProtoType *NewProto 1981 = New->getType()->getAs<FunctionProtoType>(); 1982 1983 // Determine whether this is the GNU C extension. 1984 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1985 NewProto->getResultType()); 1986 bool LooseCompatible = !MergedReturn.isNull(); 1987 for (unsigned Idx = 0, End = Old->getNumParams(); 1988 LooseCompatible && Idx != End; ++Idx) { 1989 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1990 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1991 if (Context.typesAreCompatible(OldParm->getType(), 1992 NewProto->getArgType(Idx))) { 1993 ArgTypes.push_back(NewParm->getType()); 1994 } else if (Context.typesAreCompatible(OldParm->getType(), 1995 NewParm->getType(), 1996 /*CompareUnqualified=*/true)) { 1997 GNUCompatibleParamWarning Warn 1998 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1999 Warnings.push_back(Warn); 2000 ArgTypes.push_back(NewParm->getType()); 2001 } else 2002 LooseCompatible = false; 2003 } 2004 2005 if (LooseCompatible) { 2006 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 2007 Diag(Warnings[Warn].NewParm->getLocation(), 2008 diag::ext_param_promoted_not_compatible_with_prototype) 2009 << Warnings[Warn].PromotedType 2010 << Warnings[Warn].OldParm->getType(); 2011 if (Warnings[Warn].OldParm->getLocation().isValid()) 2012 Diag(Warnings[Warn].OldParm->getLocation(), 2013 diag::note_previous_declaration); 2014 } 2015 2016 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 2017 ArgTypes.size(), 2018 OldProto->getExtProtoInfo())); 2019 return MergeCompatibleFunctionDecls(New, Old); 2020 } 2021 2022 // Fall through to diagnose conflicting types. 2023 } 2024 2025 // A function that has already been declared has been redeclared or defined 2026 // with a different type- show appropriate diagnostic 2027 if (unsigned BuiltinID = Old->getBuiltinID()) { 2028 // The user has declared a builtin function with an incompatible 2029 // signature. 2030 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2031 // The function the user is redeclaring is a library-defined 2032 // function like 'malloc' or 'printf'. Warn about the 2033 // redeclaration, then pretend that we don't know about this 2034 // library built-in. 2035 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2036 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2037 << Old << Old->getType(); 2038 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2039 Old->setInvalidDecl(); 2040 return false; 2041 } 2042 2043 PrevDiag = diag::note_previous_builtin_declaration; 2044 } 2045 2046 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2047 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2048 return true; 2049} 2050 2051/// \brief Completes the merge of two function declarations that are 2052/// known to be compatible. 2053/// 2054/// This routine handles the merging of attributes and other 2055/// properties of function declarations form the old declaration to 2056/// the new declaration, once we know that New is in fact a 2057/// redeclaration of Old. 2058/// 2059/// \returns false 2060bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2061 // Merge the attributes 2062 mergeDeclAttributes(New, Old); 2063 2064 // Merge the storage class. 2065 if (Old->getStorageClass() != SC_Extern && 2066 Old->getStorageClass() != SC_None) 2067 New->setStorageClass(Old->getStorageClass()); 2068 2069 // Merge "pure" flag. 2070 if (Old->isPure()) 2071 New->setPure(); 2072 2073 // Merge attributes from the parameters. These can mismatch with K&R 2074 // declarations. 2075 if (New->getNumParams() == Old->getNumParams()) 2076 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2077 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2078 Context); 2079 2080 if (getLangOptions().CPlusPlus) 2081 return MergeCXXFunctionDecl(New, Old); 2082 2083 return false; 2084} 2085 2086 2087void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2088 ObjCMethodDecl *oldMethod) { 2089 // We don't want to merge unavailable and deprecated attributes 2090 // except from interface to implementation. 2091 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2092 2093 // Merge the attributes. 2094 mergeDeclAttributes(newMethod, oldMethod, mergeDeprecation); 2095 2096 // Merge attributes from the parameters. 2097 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2098 for (ObjCMethodDecl::param_iterator 2099 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2100 ni != ne; ++ni, ++oi) 2101 mergeParamDeclAttributes(*ni, *oi, Context); 2102 2103 CheckObjCMethodOverride(newMethod, oldMethod, true); 2104} 2105 2106/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2107/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2108/// emitting diagnostics as appropriate. 2109/// 2110/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2111/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2112/// check them before the initializer is attached. 2113/// 2114void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2115 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2116 return; 2117 2118 QualType MergedT; 2119 if (getLangOptions().CPlusPlus) { 2120 AutoType *AT = New->getType()->getContainedAutoType(); 2121 if (AT && !AT->isDeduced()) { 2122 // We don't know what the new type is until the initializer is attached. 2123 return; 2124 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2125 // These could still be something that needs exception specs checked. 2126 return MergeVarDeclExceptionSpecs(New, Old); 2127 } 2128 // C++ [basic.link]p10: 2129 // [...] the types specified by all declarations referring to a given 2130 // object or function shall be identical, except that declarations for an 2131 // array object can specify array types that differ by the presence or 2132 // absence of a major array bound (8.3.4). 2133 else if (Old->getType()->isIncompleteArrayType() && 2134 New->getType()->isArrayType()) { 2135 CanQual<ArrayType> OldArray 2136 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2137 CanQual<ArrayType> NewArray 2138 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2139 if (OldArray->getElementType() == NewArray->getElementType()) 2140 MergedT = New->getType(); 2141 } else if (Old->getType()->isArrayType() && 2142 New->getType()->isIncompleteArrayType()) { 2143 CanQual<ArrayType> OldArray 2144 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2145 CanQual<ArrayType> NewArray 2146 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2147 if (OldArray->getElementType() == NewArray->getElementType()) 2148 MergedT = Old->getType(); 2149 } else if (New->getType()->isObjCObjectPointerType() 2150 && Old->getType()->isObjCObjectPointerType()) { 2151 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2152 Old->getType()); 2153 } 2154 } else { 2155 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2156 } 2157 if (MergedT.isNull()) { 2158 Diag(New->getLocation(), diag::err_redefinition_different_type) 2159 << New->getDeclName(); 2160 Diag(Old->getLocation(), diag::note_previous_definition); 2161 return New->setInvalidDecl(); 2162 } 2163 New->setType(MergedT); 2164} 2165 2166/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2167/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2168/// situation, merging decls or emitting diagnostics as appropriate. 2169/// 2170/// Tentative definition rules (C99 6.9.2p2) are checked by 2171/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2172/// definitions here, since the initializer hasn't been attached. 2173/// 2174void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2175 // If the new decl is already invalid, don't do any other checking. 2176 if (New->isInvalidDecl()) 2177 return; 2178 2179 // Verify the old decl was also a variable. 2180 VarDecl *Old = 0; 2181 if (!Previous.isSingleResult() || 2182 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2183 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2184 << New->getDeclName(); 2185 Diag(Previous.getRepresentativeDecl()->getLocation(), 2186 diag::note_previous_definition); 2187 return New->setInvalidDecl(); 2188 } 2189 2190 // C++ [class.mem]p1: 2191 // A member shall not be declared twice in the member-specification [...] 2192 // 2193 // Here, we need only consider static data members. 2194 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2195 Diag(New->getLocation(), diag::err_duplicate_member) 2196 << New->getIdentifier(); 2197 Diag(Old->getLocation(), diag::note_previous_declaration); 2198 New->setInvalidDecl(); 2199 } 2200 2201 mergeDeclAttributes(New, Old); 2202 // Warn if an already-declared variable is made a weak_import in a subsequent 2203 // declaration 2204 if (New->getAttr<WeakImportAttr>() && 2205 Old->getStorageClass() == SC_None && 2206 !Old->getAttr<WeakImportAttr>()) { 2207 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2208 Diag(Old->getLocation(), diag::note_previous_definition); 2209 // Remove weak_import attribute on new declaration. 2210 New->dropAttr<WeakImportAttr>(); 2211 } 2212 2213 // Merge the types. 2214 MergeVarDeclTypes(New, Old); 2215 if (New->isInvalidDecl()) 2216 return; 2217 2218 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2219 if (New->getStorageClass() == SC_Static && 2220 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2221 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2222 Diag(Old->getLocation(), diag::note_previous_definition); 2223 return New->setInvalidDecl(); 2224 } 2225 // C99 6.2.2p4: 2226 // For an identifier declared with the storage-class specifier 2227 // extern in a scope in which a prior declaration of that 2228 // identifier is visible,23) if the prior declaration specifies 2229 // internal or external linkage, the linkage of the identifier at 2230 // the later declaration is the same as the linkage specified at 2231 // the prior declaration. If no prior declaration is visible, or 2232 // if the prior declaration specifies no linkage, then the 2233 // identifier has external linkage. 2234 if (New->hasExternalStorage() && Old->hasLinkage()) 2235 /* Okay */; 2236 else if (New->getStorageClass() != SC_Static && 2237 Old->getStorageClass() == SC_Static) { 2238 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2239 Diag(Old->getLocation(), diag::note_previous_definition); 2240 return New->setInvalidDecl(); 2241 } 2242 2243 // Check if extern is followed by non-extern and vice-versa. 2244 if (New->hasExternalStorage() && 2245 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2246 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2247 Diag(Old->getLocation(), diag::note_previous_definition); 2248 return New->setInvalidDecl(); 2249 } 2250 if (Old->hasExternalStorage() && 2251 !New->hasLinkage() && New->isLocalVarDecl()) { 2252 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2253 Diag(Old->getLocation(), diag::note_previous_definition); 2254 return New->setInvalidDecl(); 2255 } 2256 2257 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2258 2259 // FIXME: The test for external storage here seems wrong? We still 2260 // need to check for mismatches. 2261 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2262 // Don't complain about out-of-line definitions of static members. 2263 !(Old->getLexicalDeclContext()->isRecord() && 2264 !New->getLexicalDeclContext()->isRecord())) { 2265 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2266 Diag(Old->getLocation(), diag::note_previous_definition); 2267 return New->setInvalidDecl(); 2268 } 2269 2270 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2271 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2272 Diag(Old->getLocation(), diag::note_previous_definition); 2273 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2274 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2275 Diag(Old->getLocation(), diag::note_previous_definition); 2276 } 2277 2278 // C++ doesn't have tentative definitions, so go right ahead and check here. 2279 const VarDecl *Def; 2280 if (getLangOptions().CPlusPlus && 2281 New->isThisDeclarationADefinition() == VarDecl::Definition && 2282 (Def = Old->getDefinition())) { 2283 Diag(New->getLocation(), diag::err_redefinition) 2284 << New->getDeclName(); 2285 Diag(Def->getLocation(), diag::note_previous_definition); 2286 New->setInvalidDecl(); 2287 return; 2288 } 2289 // c99 6.2.2 P4. 2290 // For an identifier declared with the storage-class specifier extern in a 2291 // scope in which a prior declaration of that identifier is visible, if 2292 // the prior declaration specifies internal or external linkage, the linkage 2293 // of the identifier at the later declaration is the same as the linkage 2294 // specified at the prior declaration. 2295 // FIXME. revisit this code. 2296 if (New->hasExternalStorage() && 2297 Old->getLinkage() == InternalLinkage && 2298 New->getDeclContext() == Old->getDeclContext()) 2299 New->setStorageClass(Old->getStorageClass()); 2300 2301 // Keep a chain of previous declarations. 2302 New->setPreviousDeclaration(Old); 2303 2304 // Inherit access appropriately. 2305 New->setAccess(Old->getAccess()); 2306} 2307 2308/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2309/// no declarator (e.g. "struct foo;") is parsed. 2310Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2311 DeclSpec &DS) { 2312 return ParsedFreeStandingDeclSpec(S, AS, DS, 2313 MultiTemplateParamsArg(*this, 0, 0)); 2314} 2315 2316/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2317/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2318/// parameters to cope with template friend declarations. 2319Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2320 DeclSpec &DS, 2321 MultiTemplateParamsArg TemplateParams) { 2322 Decl *TagD = 0; 2323 TagDecl *Tag = 0; 2324 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2325 DS.getTypeSpecType() == DeclSpec::TST_struct || 2326 DS.getTypeSpecType() == DeclSpec::TST_union || 2327 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2328 TagD = DS.getRepAsDecl(); 2329 2330 if (!TagD) // We probably had an error 2331 return 0; 2332 2333 // Note that the above type specs guarantee that the 2334 // type rep is a Decl, whereas in many of the others 2335 // it's a Type. 2336 if (isa<TagDecl>(TagD)) 2337 Tag = cast<TagDecl>(TagD); 2338 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2339 Tag = CTD->getTemplatedDecl(); 2340 } 2341 2342 if (Tag) 2343 Tag->setFreeStanding(); 2344 2345 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2346 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2347 // or incomplete types shall not be restrict-qualified." 2348 if (TypeQuals & DeclSpec::TQ_restrict) 2349 Diag(DS.getRestrictSpecLoc(), 2350 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2351 << DS.getSourceRange(); 2352 } 2353 2354 if (DS.isConstexprSpecified()) { 2355 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2356 // and definitions of functions and variables. 2357 if (Tag) 2358 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2359 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2360 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2361 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2362 else 2363 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2364 // Don't emit warnings after this error. 2365 return TagD; 2366 } 2367 2368 if (DS.isFriendSpecified()) { 2369 // If we're dealing with a decl but not a TagDecl, assume that 2370 // whatever routines created it handled the friendship aspect. 2371 if (TagD && !Tag) 2372 return 0; 2373 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2374 } 2375 2376 // Track whether we warned about the fact that there aren't any 2377 // declarators. 2378 bool emittedWarning = false; 2379 2380 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2381 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2382 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2383 if (getLangOptions().CPlusPlus || 2384 Record->getDeclContext()->isRecord()) 2385 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2386 2387 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2388 << DS.getSourceRange(); 2389 emittedWarning = true; 2390 } 2391 } 2392 2393 // Check for Microsoft C extension: anonymous struct. 2394 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2395 CurContext->isRecord() && 2396 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2397 // Handle 2 kinds of anonymous struct: 2398 // struct STRUCT; 2399 // and 2400 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2401 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2402 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2403 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2404 DS.getRepAsType().get()->isStructureType())) { 2405 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2406 << DS.getSourceRange(); 2407 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2408 } 2409 } 2410 2411 if (getLangOptions().CPlusPlus && 2412 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2413 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2414 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2415 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2416 Diag(Enum->getLocation(), diag::ext_no_declarators) 2417 << DS.getSourceRange(); 2418 emittedWarning = true; 2419 } 2420 2421 // Skip all the checks below if we have a type error. 2422 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2423 2424 if (!DS.isMissingDeclaratorOk()) { 2425 // Warn about typedefs of enums without names, since this is an 2426 // extension in both Microsoft and GNU. 2427 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2428 Tag && isa<EnumDecl>(Tag)) { 2429 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2430 << DS.getSourceRange(); 2431 return Tag; 2432 } 2433 2434 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2435 << DS.getSourceRange(); 2436 emittedWarning = true; 2437 } 2438 2439 // We're going to complain about a bunch of spurious specifiers; 2440 // only do this if we're declaring a tag, because otherwise we 2441 // should be getting diag::ext_no_declarators. 2442 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2443 return TagD; 2444 2445 // Note that a linkage-specification sets a storage class, but 2446 // 'extern "C" struct foo;' is actually valid and not theoretically 2447 // useless. 2448 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2449 if (!DS.isExternInLinkageSpec()) 2450 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2451 << DeclSpec::getSpecifierName(scs); 2452 2453 if (DS.isThreadSpecified()) 2454 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2455 if (DS.getTypeQualifiers()) { 2456 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2457 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2458 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2459 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2460 // Restrict is covered above. 2461 } 2462 if (DS.isInlineSpecified()) 2463 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2464 if (DS.isVirtualSpecified()) 2465 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2466 if (DS.isExplicitSpecified()) 2467 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2468 2469 if (DS.isModulePrivateSpecified() && 2470 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2471 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2472 << Tag->getTagKind() 2473 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2474 2475 // Warn about ignored type attributes, for example: 2476 // __attribute__((aligned)) struct A; 2477 // Attributes should be placed after tag to apply to type declaration. 2478 if (!DS.getAttributes().empty()) { 2479 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2480 if (TypeSpecType == DeclSpec::TST_class || 2481 TypeSpecType == DeclSpec::TST_struct || 2482 TypeSpecType == DeclSpec::TST_union || 2483 TypeSpecType == DeclSpec::TST_enum) { 2484 AttributeList* attrs = DS.getAttributes().getList(); 2485 while (attrs) { 2486 Diag(attrs->getScopeLoc(), 2487 diag::warn_declspec_attribute_ignored) 2488 << attrs->getName() 2489 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2490 TypeSpecType == DeclSpec::TST_struct ? 1 : 2491 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2492 attrs = attrs->getNext(); 2493 } 2494 } 2495 } 2496 2497 return TagD; 2498} 2499 2500/// We are trying to inject an anonymous member into the given scope; 2501/// check if there's an existing declaration that can't be overloaded. 2502/// 2503/// \return true if this is a forbidden redeclaration 2504static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2505 Scope *S, 2506 DeclContext *Owner, 2507 DeclarationName Name, 2508 SourceLocation NameLoc, 2509 unsigned diagnostic) { 2510 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2511 Sema::ForRedeclaration); 2512 if (!SemaRef.LookupName(R, S)) return false; 2513 2514 if (R.getAsSingle<TagDecl>()) 2515 return false; 2516 2517 // Pick a representative declaration. 2518 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2519 assert(PrevDecl && "Expected a non-null Decl"); 2520 2521 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2522 return false; 2523 2524 SemaRef.Diag(NameLoc, diagnostic) << Name; 2525 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2526 2527 return true; 2528} 2529 2530/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2531/// anonymous struct or union AnonRecord into the owning context Owner 2532/// and scope S. This routine will be invoked just after we realize 2533/// that an unnamed union or struct is actually an anonymous union or 2534/// struct, e.g., 2535/// 2536/// @code 2537/// union { 2538/// int i; 2539/// float f; 2540/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2541/// // f into the surrounding scope.x 2542/// @endcode 2543/// 2544/// This routine is recursive, injecting the names of nested anonymous 2545/// structs/unions into the owning context and scope as well. 2546static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2547 DeclContext *Owner, 2548 RecordDecl *AnonRecord, 2549 AccessSpecifier AS, 2550 SmallVector<NamedDecl*, 2> &Chaining, 2551 bool MSAnonStruct) { 2552 unsigned diagKind 2553 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2554 : diag::err_anonymous_struct_member_redecl; 2555 2556 bool Invalid = false; 2557 2558 // Look every FieldDecl and IndirectFieldDecl with a name. 2559 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2560 DEnd = AnonRecord->decls_end(); 2561 D != DEnd; ++D) { 2562 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2563 cast<NamedDecl>(*D)->getDeclName()) { 2564 ValueDecl *VD = cast<ValueDecl>(*D); 2565 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2566 VD->getLocation(), diagKind)) { 2567 // C++ [class.union]p2: 2568 // The names of the members of an anonymous union shall be 2569 // distinct from the names of any other entity in the 2570 // scope in which the anonymous union is declared. 2571 Invalid = true; 2572 } else { 2573 // C++ [class.union]p2: 2574 // For the purpose of name lookup, after the anonymous union 2575 // definition, the members of the anonymous union are 2576 // considered to have been defined in the scope in which the 2577 // anonymous union is declared. 2578 unsigned OldChainingSize = Chaining.size(); 2579 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2580 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2581 PE = IF->chain_end(); PI != PE; ++PI) 2582 Chaining.push_back(*PI); 2583 else 2584 Chaining.push_back(VD); 2585 2586 assert(Chaining.size() >= 2); 2587 NamedDecl **NamedChain = 2588 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2589 for (unsigned i = 0; i < Chaining.size(); i++) 2590 NamedChain[i] = Chaining[i]; 2591 2592 IndirectFieldDecl* IndirectField = 2593 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2594 VD->getIdentifier(), VD->getType(), 2595 NamedChain, Chaining.size()); 2596 2597 IndirectField->setAccess(AS); 2598 IndirectField->setImplicit(); 2599 SemaRef.PushOnScopeChains(IndirectField, S); 2600 2601 // That includes picking up the appropriate access specifier. 2602 if (AS != AS_none) IndirectField->setAccess(AS); 2603 2604 Chaining.resize(OldChainingSize); 2605 } 2606 } 2607 } 2608 2609 return Invalid; 2610} 2611 2612/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2613/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2614/// illegal input values are mapped to SC_None. 2615static StorageClass 2616StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2617 switch (StorageClassSpec) { 2618 case DeclSpec::SCS_unspecified: return SC_None; 2619 case DeclSpec::SCS_extern: return SC_Extern; 2620 case DeclSpec::SCS_static: return SC_Static; 2621 case DeclSpec::SCS_auto: return SC_Auto; 2622 case DeclSpec::SCS_register: return SC_Register; 2623 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2624 // Illegal SCSs map to None: error reporting is up to the caller. 2625 case DeclSpec::SCS_mutable: // Fall through. 2626 case DeclSpec::SCS_typedef: return SC_None; 2627 } 2628 llvm_unreachable("unknown storage class specifier"); 2629} 2630 2631/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2632/// a StorageClass. Any error reporting is up to the caller: 2633/// illegal input values are mapped to SC_None. 2634static StorageClass 2635StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2636 switch (StorageClassSpec) { 2637 case DeclSpec::SCS_unspecified: return SC_None; 2638 case DeclSpec::SCS_extern: return SC_Extern; 2639 case DeclSpec::SCS_static: return SC_Static; 2640 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2641 // Illegal SCSs map to None: error reporting is up to the caller. 2642 case DeclSpec::SCS_auto: // Fall through. 2643 case DeclSpec::SCS_mutable: // Fall through. 2644 case DeclSpec::SCS_register: // Fall through. 2645 case DeclSpec::SCS_typedef: return SC_None; 2646 } 2647 llvm_unreachable("unknown storage class specifier"); 2648} 2649 2650/// BuildAnonymousStructOrUnion - Handle the declaration of an 2651/// anonymous structure or union. Anonymous unions are a C++ feature 2652/// (C++ [class.union]) and a GNU C extension; anonymous structures 2653/// are a GNU C and GNU C++ extension. 2654Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2655 AccessSpecifier AS, 2656 RecordDecl *Record) { 2657 DeclContext *Owner = Record->getDeclContext(); 2658 2659 // Diagnose whether this anonymous struct/union is an extension. 2660 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2661 Diag(Record->getLocation(), diag::ext_anonymous_union); 2662 else if (!Record->isUnion()) 2663 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2664 2665 // C and C++ require different kinds of checks for anonymous 2666 // structs/unions. 2667 bool Invalid = false; 2668 if (getLangOptions().CPlusPlus) { 2669 const char* PrevSpec = 0; 2670 unsigned DiagID; 2671 if (Record->isUnion()) { 2672 // C++ [class.union]p6: 2673 // Anonymous unions declared in a named namespace or in the 2674 // global namespace shall be declared static. 2675 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2676 (isa<TranslationUnitDecl>(Owner) || 2677 (isa<NamespaceDecl>(Owner) && 2678 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2679 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2680 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2681 2682 // Recover by adding 'static'. 2683 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2684 PrevSpec, DiagID); 2685 } 2686 // C++ [class.union]p6: 2687 // A storage class is not allowed in a declaration of an 2688 // anonymous union in a class scope. 2689 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2690 isa<RecordDecl>(Owner)) { 2691 Diag(DS.getStorageClassSpecLoc(), 2692 diag::err_anonymous_union_with_storage_spec) 2693 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2694 2695 // Recover by removing the storage specifier. 2696 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2697 SourceLocation(), 2698 PrevSpec, DiagID); 2699 } 2700 } 2701 2702 // Ignore const/volatile/restrict qualifiers. 2703 if (DS.getTypeQualifiers()) { 2704 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2705 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2706 << Record->isUnion() << 0 2707 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2708 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2709 Diag(DS.getVolatileSpecLoc(), 2710 diag::ext_anonymous_struct_union_qualified) 2711 << Record->isUnion() << 1 2712 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2713 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2714 Diag(DS.getRestrictSpecLoc(), 2715 diag::ext_anonymous_struct_union_qualified) 2716 << Record->isUnion() << 2 2717 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2718 2719 DS.ClearTypeQualifiers(); 2720 } 2721 2722 // C++ [class.union]p2: 2723 // The member-specification of an anonymous union shall only 2724 // define non-static data members. [Note: nested types and 2725 // functions cannot be declared within an anonymous union. ] 2726 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2727 MemEnd = Record->decls_end(); 2728 Mem != MemEnd; ++Mem) { 2729 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2730 // C++ [class.union]p3: 2731 // An anonymous union shall not have private or protected 2732 // members (clause 11). 2733 assert(FD->getAccess() != AS_none); 2734 if (FD->getAccess() != AS_public) { 2735 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2736 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2737 Invalid = true; 2738 } 2739 2740 // C++ [class.union]p1 2741 // An object of a class with a non-trivial constructor, a non-trivial 2742 // copy constructor, a non-trivial destructor, or a non-trivial copy 2743 // assignment operator cannot be a member of a union, nor can an 2744 // array of such objects. 2745 if (CheckNontrivialField(FD)) 2746 Invalid = true; 2747 } else if ((*Mem)->isImplicit()) { 2748 // Any implicit members are fine. 2749 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2750 // This is a type that showed up in an 2751 // elaborated-type-specifier inside the anonymous struct or 2752 // union, but which actually declares a type outside of the 2753 // anonymous struct or union. It's okay. 2754 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2755 if (!MemRecord->isAnonymousStructOrUnion() && 2756 MemRecord->getDeclName()) { 2757 // Visual C++ allows type definition in anonymous struct or union. 2758 if (getLangOptions().MicrosoftExt) 2759 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2760 << (int)Record->isUnion(); 2761 else { 2762 // This is a nested type declaration. 2763 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2764 << (int)Record->isUnion(); 2765 Invalid = true; 2766 } 2767 } 2768 } else if (isa<AccessSpecDecl>(*Mem)) { 2769 // Any access specifier is fine. 2770 } else { 2771 // We have something that isn't a non-static data 2772 // member. Complain about it. 2773 unsigned DK = diag::err_anonymous_record_bad_member; 2774 if (isa<TypeDecl>(*Mem)) 2775 DK = diag::err_anonymous_record_with_type; 2776 else if (isa<FunctionDecl>(*Mem)) 2777 DK = diag::err_anonymous_record_with_function; 2778 else if (isa<VarDecl>(*Mem)) 2779 DK = diag::err_anonymous_record_with_static; 2780 2781 // Visual C++ allows type definition in anonymous struct or union. 2782 if (getLangOptions().MicrosoftExt && 2783 DK == diag::err_anonymous_record_with_type) 2784 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2785 << (int)Record->isUnion(); 2786 else { 2787 Diag((*Mem)->getLocation(), DK) 2788 << (int)Record->isUnion(); 2789 Invalid = true; 2790 } 2791 } 2792 } 2793 } 2794 2795 if (!Record->isUnion() && !Owner->isRecord()) { 2796 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2797 << (int)getLangOptions().CPlusPlus; 2798 Invalid = true; 2799 } 2800 2801 // Mock up a declarator. 2802 Declarator Dc(DS, Declarator::MemberContext); 2803 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2804 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2805 2806 // Create a declaration for this anonymous struct/union. 2807 NamedDecl *Anon = 0; 2808 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2809 Anon = FieldDecl::Create(Context, OwningClass, 2810 DS.getSourceRange().getBegin(), 2811 Record->getLocation(), 2812 /*IdentifierInfo=*/0, 2813 Context.getTypeDeclType(Record), 2814 TInfo, 2815 /*BitWidth=*/0, /*Mutable=*/false, 2816 /*HasInit=*/false); 2817 Anon->setAccess(AS); 2818 if (getLangOptions().CPlusPlus) 2819 FieldCollector->Add(cast<FieldDecl>(Anon)); 2820 } else { 2821 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2822 assert(SCSpec != DeclSpec::SCS_typedef && 2823 "Parser allowed 'typedef' as storage class VarDecl."); 2824 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2825 if (SCSpec == DeclSpec::SCS_mutable) { 2826 // mutable can only appear on non-static class members, so it's always 2827 // an error here 2828 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2829 Invalid = true; 2830 SC = SC_None; 2831 } 2832 SCSpec = DS.getStorageClassSpecAsWritten(); 2833 VarDecl::StorageClass SCAsWritten 2834 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2835 2836 Anon = VarDecl::Create(Context, Owner, 2837 DS.getSourceRange().getBegin(), 2838 Record->getLocation(), /*IdentifierInfo=*/0, 2839 Context.getTypeDeclType(Record), 2840 TInfo, SC, SCAsWritten); 2841 2842 // Default-initialize the implicit variable. This initialization will be 2843 // trivial in almost all cases, except if a union member has an in-class 2844 // initializer: 2845 // union { int n = 0; }; 2846 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2847 } 2848 Anon->setImplicit(); 2849 2850 // Add the anonymous struct/union object to the current 2851 // context. We'll be referencing this object when we refer to one of 2852 // its members. 2853 Owner->addDecl(Anon); 2854 2855 // Inject the members of the anonymous struct/union into the owning 2856 // context and into the identifier resolver chain for name lookup 2857 // purposes. 2858 SmallVector<NamedDecl*, 2> Chain; 2859 Chain.push_back(Anon); 2860 2861 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2862 Chain, false)) 2863 Invalid = true; 2864 2865 // Mark this as an anonymous struct/union type. Note that we do not 2866 // do this until after we have already checked and injected the 2867 // members of this anonymous struct/union type, because otherwise 2868 // the members could be injected twice: once by DeclContext when it 2869 // builds its lookup table, and once by 2870 // InjectAnonymousStructOrUnionMembers. 2871 Record->setAnonymousStructOrUnion(true); 2872 2873 if (Invalid) 2874 Anon->setInvalidDecl(); 2875 2876 return Anon; 2877} 2878 2879/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2880/// Microsoft C anonymous structure. 2881/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2882/// Example: 2883/// 2884/// struct A { int a; }; 2885/// struct B { struct A; int b; }; 2886/// 2887/// void foo() { 2888/// B var; 2889/// var.a = 3; 2890/// } 2891/// 2892Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2893 RecordDecl *Record) { 2894 2895 // If there is no Record, get the record via the typedef. 2896 if (!Record) 2897 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2898 2899 // Mock up a declarator. 2900 Declarator Dc(DS, Declarator::TypeNameContext); 2901 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2902 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2903 2904 // Create a declaration for this anonymous struct. 2905 NamedDecl* Anon = FieldDecl::Create(Context, 2906 cast<RecordDecl>(CurContext), 2907 DS.getSourceRange().getBegin(), 2908 DS.getSourceRange().getBegin(), 2909 /*IdentifierInfo=*/0, 2910 Context.getTypeDeclType(Record), 2911 TInfo, 2912 /*BitWidth=*/0, /*Mutable=*/false, 2913 /*HasInit=*/false); 2914 Anon->setImplicit(); 2915 2916 // Add the anonymous struct object to the current context. 2917 CurContext->addDecl(Anon); 2918 2919 // Inject the members of the anonymous struct into the current 2920 // context and into the identifier resolver chain for name lookup 2921 // purposes. 2922 SmallVector<NamedDecl*, 2> Chain; 2923 Chain.push_back(Anon); 2924 2925 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2926 Record->getDefinition(), 2927 AS_none, Chain, true)) 2928 Anon->setInvalidDecl(); 2929 2930 return Anon; 2931} 2932 2933/// GetNameForDeclarator - Determine the full declaration name for the 2934/// given Declarator. 2935DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2936 return GetNameFromUnqualifiedId(D.getName()); 2937} 2938 2939/// \brief Retrieves the declaration name from a parsed unqualified-id. 2940DeclarationNameInfo 2941Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2942 DeclarationNameInfo NameInfo; 2943 NameInfo.setLoc(Name.StartLocation); 2944 2945 switch (Name.getKind()) { 2946 2947 case UnqualifiedId::IK_ImplicitSelfParam: 2948 case UnqualifiedId::IK_Identifier: 2949 NameInfo.setName(Name.Identifier); 2950 NameInfo.setLoc(Name.StartLocation); 2951 return NameInfo; 2952 2953 case UnqualifiedId::IK_OperatorFunctionId: 2954 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2955 Name.OperatorFunctionId.Operator)); 2956 NameInfo.setLoc(Name.StartLocation); 2957 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2958 = Name.OperatorFunctionId.SymbolLocations[0]; 2959 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2960 = Name.EndLocation.getRawEncoding(); 2961 return NameInfo; 2962 2963 case UnqualifiedId::IK_LiteralOperatorId: 2964 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2965 Name.Identifier)); 2966 NameInfo.setLoc(Name.StartLocation); 2967 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2968 return NameInfo; 2969 2970 case UnqualifiedId::IK_ConversionFunctionId: { 2971 TypeSourceInfo *TInfo; 2972 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2973 if (Ty.isNull()) 2974 return DeclarationNameInfo(); 2975 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2976 Context.getCanonicalType(Ty))); 2977 NameInfo.setLoc(Name.StartLocation); 2978 NameInfo.setNamedTypeInfo(TInfo); 2979 return NameInfo; 2980 } 2981 2982 case UnqualifiedId::IK_ConstructorName: { 2983 TypeSourceInfo *TInfo; 2984 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2985 if (Ty.isNull()) 2986 return DeclarationNameInfo(); 2987 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2988 Context.getCanonicalType(Ty))); 2989 NameInfo.setLoc(Name.StartLocation); 2990 NameInfo.setNamedTypeInfo(TInfo); 2991 return NameInfo; 2992 } 2993 2994 case UnqualifiedId::IK_ConstructorTemplateId: { 2995 // In well-formed code, we can only have a constructor 2996 // template-id that refers to the current context, so go there 2997 // to find the actual type being constructed. 2998 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2999 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 3000 return DeclarationNameInfo(); 3001 3002 // Determine the type of the class being constructed. 3003 QualType CurClassType = Context.getTypeDeclType(CurClass); 3004 3005 // FIXME: Check two things: that the template-id names the same type as 3006 // CurClassType, and that the template-id does not occur when the name 3007 // was qualified. 3008 3009 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3010 Context.getCanonicalType(CurClassType))); 3011 NameInfo.setLoc(Name.StartLocation); 3012 // FIXME: should we retrieve TypeSourceInfo? 3013 NameInfo.setNamedTypeInfo(0); 3014 return NameInfo; 3015 } 3016 3017 case UnqualifiedId::IK_DestructorName: { 3018 TypeSourceInfo *TInfo; 3019 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3020 if (Ty.isNull()) 3021 return DeclarationNameInfo(); 3022 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3023 Context.getCanonicalType(Ty))); 3024 NameInfo.setLoc(Name.StartLocation); 3025 NameInfo.setNamedTypeInfo(TInfo); 3026 return NameInfo; 3027 } 3028 3029 case UnqualifiedId::IK_TemplateId: { 3030 TemplateName TName = Name.TemplateId->Template.get(); 3031 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3032 return Context.getNameForTemplate(TName, TNameLoc); 3033 } 3034 3035 } // switch (Name.getKind()) 3036 3037 llvm_unreachable("Unknown name kind"); 3038} 3039 3040static QualType getCoreType(QualType Ty) { 3041 do { 3042 if (Ty->isPointerType() || Ty->isReferenceType()) 3043 Ty = Ty->getPointeeType(); 3044 else if (Ty->isArrayType()) 3045 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3046 else 3047 return Ty.withoutLocalFastQualifiers(); 3048 } while (true); 3049} 3050 3051/// hasSimilarParameters - Determine whether the C++ functions Declaration 3052/// and Definition have "nearly" matching parameters. This heuristic is 3053/// used to improve diagnostics in the case where an out-of-line function 3054/// definition doesn't match any declaration within the class or namespace. 3055/// Also sets Params to the list of indices to the parameters that differ 3056/// between the declaration and the definition. If hasSimilarParameters 3057/// returns true and Params is empty, then all of the parameters match. 3058static bool hasSimilarParameters(ASTContext &Context, 3059 FunctionDecl *Declaration, 3060 FunctionDecl *Definition, 3061 llvm::SmallVectorImpl<unsigned> &Params) { 3062 Params.clear(); 3063 if (Declaration->param_size() != Definition->param_size()) 3064 return false; 3065 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3066 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3067 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3068 3069 // The parameter types are identical 3070 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3071 continue; 3072 3073 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3074 QualType DefParamBaseTy = getCoreType(DefParamTy); 3075 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3076 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3077 3078 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3079 (DeclTyName && DeclTyName == DefTyName)) 3080 Params.push_back(Idx); 3081 else // The two parameters aren't even close 3082 return false; 3083 } 3084 3085 return true; 3086} 3087 3088/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3089/// declarator needs to be rebuilt in the current instantiation. 3090/// Any bits of declarator which appear before the name are valid for 3091/// consideration here. That's specifically the type in the decl spec 3092/// and the base type in any member-pointer chunks. 3093static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3094 DeclarationName Name) { 3095 // The types we specifically need to rebuild are: 3096 // - typenames, typeofs, and decltypes 3097 // - types which will become injected class names 3098 // Of course, we also need to rebuild any type referencing such a 3099 // type. It's safest to just say "dependent", but we call out a 3100 // few cases here. 3101 3102 DeclSpec &DS = D.getMutableDeclSpec(); 3103 switch (DS.getTypeSpecType()) { 3104 case DeclSpec::TST_typename: 3105 case DeclSpec::TST_typeofType: 3106 case DeclSpec::TST_decltype: 3107 case DeclSpec::TST_underlyingType: 3108 case DeclSpec::TST_atomic: { 3109 // Grab the type from the parser. 3110 TypeSourceInfo *TSI = 0; 3111 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3112 if (T.isNull() || !T->isDependentType()) break; 3113 3114 // Make sure there's a type source info. This isn't really much 3115 // of a waste; most dependent types should have type source info 3116 // attached already. 3117 if (!TSI) 3118 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3119 3120 // Rebuild the type in the current instantiation. 3121 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3122 if (!TSI) return true; 3123 3124 // Store the new type back in the decl spec. 3125 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3126 DS.UpdateTypeRep(LocType); 3127 break; 3128 } 3129 3130 case DeclSpec::TST_typeofExpr: { 3131 Expr *E = DS.getRepAsExpr(); 3132 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3133 if (Result.isInvalid()) return true; 3134 DS.UpdateExprRep(Result.get()); 3135 break; 3136 } 3137 3138 default: 3139 // Nothing to do for these decl specs. 3140 break; 3141 } 3142 3143 // It doesn't matter what order we do this in. 3144 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3145 DeclaratorChunk &Chunk = D.getTypeObject(I); 3146 3147 // The only type information in the declarator which can come 3148 // before the declaration name is the base type of a member 3149 // pointer. 3150 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3151 continue; 3152 3153 // Rebuild the scope specifier in-place. 3154 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3155 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3156 return true; 3157 } 3158 3159 return false; 3160} 3161 3162Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3163 D.setFunctionDefinitionKind(FDK_Declaration); 3164 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3165 3166 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3167 Dcl->getDeclContext()->isFileContext()) 3168 Dcl->setTopLevelDeclInObjCContainer(); 3169 3170 return Dcl; 3171} 3172 3173/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3174/// If T is the name of a class, then each of the following shall have a 3175/// name different from T: 3176/// - every static data member of class T; 3177/// - every member function of class T 3178/// - every member of class T that is itself a type; 3179/// \returns true if the declaration name violates these rules. 3180bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3181 DeclarationNameInfo NameInfo) { 3182 DeclarationName Name = NameInfo.getName(); 3183 3184 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3185 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3186 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3187 return true; 3188 } 3189 3190 return false; 3191} 3192 3193Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3194 MultiTemplateParamsArg TemplateParamLists) { 3195 // TODO: consider using NameInfo for diagnostic. 3196 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3197 DeclarationName Name = NameInfo.getName(); 3198 3199 // All of these full declarators require an identifier. If it doesn't have 3200 // one, the ParsedFreeStandingDeclSpec action should be used. 3201 if (!Name) { 3202 if (!D.isInvalidType()) // Reject this if we think it is valid. 3203 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3204 diag::err_declarator_need_ident) 3205 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3206 return 0; 3207 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3208 return 0; 3209 3210 // The scope passed in may not be a decl scope. Zip up the scope tree until 3211 // we find one that is. 3212 while ((S->getFlags() & Scope::DeclScope) == 0 || 3213 (S->getFlags() & Scope::TemplateParamScope) != 0) 3214 S = S->getParent(); 3215 3216 DeclContext *DC = CurContext; 3217 if (D.getCXXScopeSpec().isInvalid()) 3218 D.setInvalidType(); 3219 else if (D.getCXXScopeSpec().isSet()) { 3220 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3221 UPPC_DeclarationQualifier)) 3222 return 0; 3223 3224 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3225 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3226 if (!DC) { 3227 // If we could not compute the declaration context, it's because the 3228 // declaration context is dependent but does not refer to a class, 3229 // class template, or class template partial specialization. Complain 3230 // and return early, to avoid the coming semantic disaster. 3231 Diag(D.getIdentifierLoc(), 3232 diag::err_template_qualified_declarator_no_match) 3233 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3234 << D.getCXXScopeSpec().getRange(); 3235 return 0; 3236 } 3237 bool IsDependentContext = DC->isDependentContext(); 3238 3239 if (!IsDependentContext && 3240 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3241 return 0; 3242 3243 if (isa<CXXRecordDecl>(DC)) { 3244 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3245 Diag(D.getIdentifierLoc(), 3246 diag::err_member_def_undefined_record) 3247 << Name << DC << D.getCXXScopeSpec().getRange(); 3248 D.setInvalidType(); 3249 } else if (isa<CXXRecordDecl>(CurContext) && 3250 !D.getDeclSpec().isFriendSpecified()) { 3251 // The user provided a superfluous scope specifier inside a class 3252 // definition: 3253 // 3254 // class X { 3255 // void X::f(); 3256 // }; 3257 if (CurContext->Equals(DC)) { 3258 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3259 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3260 } else { 3261 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3262 << Name << D.getCXXScopeSpec().getRange(); 3263 3264 // C++ constructors and destructors with incorrect scopes can break 3265 // our AST invariants by having the wrong underlying types. If 3266 // that's the case, then drop this declaration entirely. 3267 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3268 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3269 !Context.hasSameType(Name.getCXXNameType(), 3270 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)))) 3271 return 0; 3272 } 3273 3274 // Pretend that this qualifier was not here. 3275 D.getCXXScopeSpec().clear(); 3276 } 3277 } 3278 3279 // Check whether we need to rebuild the type of the given 3280 // declaration in the current instantiation. 3281 if (EnteringContext && IsDependentContext && 3282 TemplateParamLists.size() != 0) { 3283 ContextRAII SavedContext(*this, DC); 3284 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3285 D.setInvalidType(); 3286 } 3287 } 3288 3289 if (DiagnoseClassNameShadow(DC, NameInfo)) 3290 // If this is a typedef, we'll end up spewing multiple diagnostics. 3291 // Just return early; it's safer. 3292 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3293 return 0; 3294 3295 NamedDecl *New; 3296 3297 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3298 QualType R = TInfo->getType(); 3299 3300 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3301 UPPC_DeclarationType)) 3302 D.setInvalidType(); 3303 3304 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3305 ForRedeclaration); 3306 3307 // See if this is a redefinition of a variable in the same scope. 3308 if (!D.getCXXScopeSpec().isSet()) { 3309 bool IsLinkageLookup = false; 3310 3311 // If the declaration we're planning to build will be a function 3312 // or object with linkage, then look for another declaration with 3313 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3314 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3315 /* Do nothing*/; 3316 else if (R->isFunctionType()) { 3317 if (CurContext->isFunctionOrMethod() || 3318 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3319 IsLinkageLookup = true; 3320 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3321 IsLinkageLookup = true; 3322 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3323 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3324 IsLinkageLookup = true; 3325 3326 if (IsLinkageLookup) 3327 Previous.clear(LookupRedeclarationWithLinkage); 3328 3329 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3330 } else { // Something like "int foo::x;" 3331 LookupQualifiedName(Previous, DC); 3332 3333 // Don't consider using declarations as previous declarations for 3334 // out-of-line members. 3335 RemoveUsingDecls(Previous); 3336 3337 // C++ 7.3.1.2p2: 3338 // Members (including explicit specializations of templates) of a named 3339 // namespace can also be defined outside that namespace by explicit 3340 // qualification of the name being defined, provided that the entity being 3341 // defined was already declared in the namespace and the definition appears 3342 // after the point of declaration in a namespace that encloses the 3343 // declarations namespace. 3344 // 3345 // Note that we only check the context at this point. We don't yet 3346 // have enough information to make sure that PrevDecl is actually 3347 // the declaration we want to match. For example, given: 3348 // 3349 // class X { 3350 // void f(); 3351 // void f(float); 3352 // }; 3353 // 3354 // void X::f(int) { } // ill-formed 3355 // 3356 // In this case, PrevDecl will point to the overload set 3357 // containing the two f's declared in X, but neither of them 3358 // matches. 3359 3360 // First check whether we named the global scope. 3361 if (isa<TranslationUnitDecl>(DC)) { 3362 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3363 << Name << D.getCXXScopeSpec().getRange(); 3364 } else { 3365 DeclContext *Cur = CurContext; 3366 while (isa<LinkageSpecDecl>(Cur)) 3367 Cur = Cur->getParent(); 3368 if (!Cur->Encloses(DC)) { 3369 // The qualifying scope doesn't enclose the original declaration. 3370 // Emit diagnostic based on current scope. 3371 SourceLocation L = D.getIdentifierLoc(); 3372 SourceRange R = D.getCXXScopeSpec().getRange(); 3373 if (isa<FunctionDecl>(Cur)) 3374 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3375 else 3376 Diag(L, diag::err_invalid_declarator_scope) 3377 << Name << cast<NamedDecl>(DC) << R; 3378 D.setInvalidType(); 3379 } 3380 3381 // C++11 8.3p1: 3382 // ... "The nested-name-specifier of the qualified declarator-id shall 3383 // not begin with a decltype-specifer" 3384 NestedNameSpecifierLoc SpecLoc = 3385 D.getCXXScopeSpec().getWithLocInContext(Context); 3386 assert(SpecLoc && "A non-empty CXXScopeSpec should have a non-empty " 3387 "NestedNameSpecifierLoc"); 3388 while (SpecLoc.getPrefix()) 3389 SpecLoc = SpecLoc.getPrefix(); 3390 if (dyn_cast_or_null<DecltypeType>( 3391 SpecLoc.getNestedNameSpecifier()->getAsType())) 3392 Diag(SpecLoc.getBeginLoc(), diag::err_decltype_in_declarator) 3393 << SpecLoc.getTypeLoc().getSourceRange(); 3394 } 3395 } 3396 3397 if (Previous.isSingleResult() && 3398 Previous.getFoundDecl()->isTemplateParameter()) { 3399 // Maybe we will complain about the shadowed template parameter. 3400 if (!D.isInvalidType()) 3401 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3402 Previous.getFoundDecl()); 3403 3404 // Just pretend that we didn't see the previous declaration. 3405 Previous.clear(); 3406 } 3407 3408 // In C++, the previous declaration we find might be a tag type 3409 // (class or enum). In this case, the new declaration will hide the 3410 // tag type. Note that this does does not apply if we're declaring a 3411 // typedef (C++ [dcl.typedef]p4). 3412 if (Previous.isSingleTagDecl() && 3413 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3414 Previous.clear(); 3415 3416 bool AddToScope = true; 3417 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3418 if (TemplateParamLists.size()) { 3419 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3420 return 0; 3421 } 3422 3423 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3424 } else if (R->isFunctionType()) { 3425 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3426 move(TemplateParamLists), 3427 AddToScope); 3428 } else { 3429 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3430 move(TemplateParamLists)); 3431 } 3432 3433 if (New == 0) 3434 return 0; 3435 3436 // If this has an identifier and is not an invalid redeclaration or 3437 // function template specialization, add it to the scope stack. 3438 if (New->getDeclName() && AddToScope && 3439 !(D.isRedeclaration() && New->isInvalidDecl())) 3440 PushOnScopeChains(New, S); 3441 3442 return New; 3443} 3444 3445/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3446/// types into constant array types in certain situations which would otherwise 3447/// be errors (for GCC compatibility). 3448static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3449 ASTContext &Context, 3450 bool &SizeIsNegative, 3451 llvm::APSInt &Oversized) { 3452 // This method tries to turn a variable array into a constant 3453 // array even when the size isn't an ICE. This is necessary 3454 // for compatibility with code that depends on gcc's buggy 3455 // constant expression folding, like struct {char x[(int)(char*)2];} 3456 SizeIsNegative = false; 3457 Oversized = 0; 3458 3459 if (T->isDependentType()) 3460 return QualType(); 3461 3462 QualifierCollector Qs; 3463 const Type *Ty = Qs.strip(T); 3464 3465 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3466 QualType Pointee = PTy->getPointeeType(); 3467 QualType FixedType = 3468 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3469 Oversized); 3470 if (FixedType.isNull()) return FixedType; 3471 FixedType = Context.getPointerType(FixedType); 3472 return Qs.apply(Context, FixedType); 3473 } 3474 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3475 QualType Inner = PTy->getInnerType(); 3476 QualType FixedType = 3477 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3478 Oversized); 3479 if (FixedType.isNull()) return FixedType; 3480 FixedType = Context.getParenType(FixedType); 3481 return Qs.apply(Context, FixedType); 3482 } 3483 3484 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3485 if (!VLATy) 3486 return QualType(); 3487 // FIXME: We should probably handle this case 3488 if (VLATy->getElementType()->isVariablyModifiedType()) 3489 return QualType(); 3490 3491 llvm::APSInt Res; 3492 if (!VLATy->getSizeExpr() || 3493 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3494 return QualType(); 3495 3496 // Check whether the array size is negative. 3497 if (Res.isSigned() && Res.isNegative()) { 3498 SizeIsNegative = true; 3499 return QualType(); 3500 } 3501 3502 // Check whether the array is too large to be addressed. 3503 unsigned ActiveSizeBits 3504 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3505 Res); 3506 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3507 Oversized = Res; 3508 return QualType(); 3509 } 3510 3511 return Context.getConstantArrayType(VLATy->getElementType(), 3512 Res, ArrayType::Normal, 0); 3513} 3514 3515/// \brief Register the given locally-scoped external C declaration so 3516/// that it can be found later for redeclarations 3517void 3518Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3519 const LookupResult &Previous, 3520 Scope *S) { 3521 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3522 "Decl is not a locally-scoped decl!"); 3523 // Note that we have a locally-scoped external with this name. 3524 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3525 3526 if (!Previous.isSingleResult()) 3527 return; 3528 3529 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3530 3531 // If there was a previous declaration of this variable, it may be 3532 // in our identifier chain. Update the identifier chain with the new 3533 // declaration. 3534 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3535 // The previous declaration was found on the identifer resolver 3536 // chain, so remove it from its scope. 3537 3538 if (S->isDeclScope(PrevDecl)) { 3539 // Special case for redeclarations in the SAME scope. 3540 // Because this declaration is going to be added to the identifier chain 3541 // later, we should temporarily take it OFF the chain. 3542 IdResolver.RemoveDecl(ND); 3543 3544 } else { 3545 // Find the scope for the original declaration. 3546 while (S && !S->isDeclScope(PrevDecl)) 3547 S = S->getParent(); 3548 } 3549 3550 if (S) 3551 S->RemoveDecl(PrevDecl); 3552 } 3553} 3554 3555llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3556Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3557 if (ExternalSource) { 3558 // Load locally-scoped external decls from the external source. 3559 SmallVector<NamedDecl *, 4> Decls; 3560 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3561 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3562 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3563 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3564 if (Pos == LocallyScopedExternalDecls.end()) 3565 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3566 } 3567 } 3568 3569 return LocallyScopedExternalDecls.find(Name); 3570} 3571 3572/// \brief Diagnose function specifiers on a declaration of an identifier that 3573/// does not identify a function. 3574void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3575 // FIXME: We should probably indicate the identifier in question to avoid 3576 // confusion for constructs like "inline int a(), b;" 3577 if (D.getDeclSpec().isInlineSpecified()) 3578 Diag(D.getDeclSpec().getInlineSpecLoc(), 3579 diag::err_inline_non_function); 3580 3581 if (D.getDeclSpec().isVirtualSpecified()) 3582 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3583 diag::err_virtual_non_function); 3584 3585 if (D.getDeclSpec().isExplicitSpecified()) 3586 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3587 diag::err_explicit_non_function); 3588} 3589 3590NamedDecl* 3591Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3592 TypeSourceInfo *TInfo, LookupResult &Previous) { 3593 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3594 if (D.getCXXScopeSpec().isSet()) { 3595 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3596 << D.getCXXScopeSpec().getRange(); 3597 D.setInvalidType(); 3598 // Pretend we didn't see the scope specifier. 3599 DC = CurContext; 3600 Previous.clear(); 3601 } 3602 3603 if (getLangOptions().CPlusPlus) { 3604 // Check that there are no default arguments (C++ only). 3605 CheckExtraCXXDefaultArguments(D); 3606 } 3607 3608 DiagnoseFunctionSpecifiers(D); 3609 3610 if (D.getDeclSpec().isThreadSpecified()) 3611 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3612 if (D.getDeclSpec().isConstexprSpecified()) 3613 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3614 << 1; 3615 3616 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3617 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3618 << D.getName().getSourceRange(); 3619 return 0; 3620 } 3621 3622 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3623 if (!NewTD) return 0; 3624 3625 // Handle attributes prior to checking for duplicates in MergeVarDecl 3626 ProcessDeclAttributes(S, NewTD, D); 3627 3628 CheckTypedefForVariablyModifiedType(S, NewTD); 3629 3630 bool Redeclaration = D.isRedeclaration(); 3631 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3632 D.setRedeclaration(Redeclaration); 3633 return ND; 3634} 3635 3636void 3637Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3638 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3639 // then it shall have block scope. 3640 // Note that variably modified types must be fixed before merging the decl so 3641 // that redeclarations will match. 3642 QualType T = NewTD->getUnderlyingType(); 3643 if (T->isVariablyModifiedType()) { 3644 getCurFunction()->setHasBranchProtectedScope(); 3645 3646 if (S->getFnParent() == 0) { 3647 bool SizeIsNegative; 3648 llvm::APSInt Oversized; 3649 QualType FixedTy = 3650 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3651 Oversized); 3652 if (!FixedTy.isNull()) { 3653 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3654 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3655 } else { 3656 if (SizeIsNegative) 3657 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3658 else if (T->isVariableArrayType()) 3659 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3660 else if (Oversized.getBoolValue()) 3661 Diag(NewTD->getLocation(), diag::err_array_too_large) 3662 << Oversized.toString(10); 3663 else 3664 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3665 NewTD->setInvalidDecl(); 3666 } 3667 } 3668 } 3669} 3670 3671 3672/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3673/// declares a typedef-name, either using the 'typedef' type specifier or via 3674/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3675NamedDecl* 3676Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3677 LookupResult &Previous, bool &Redeclaration) { 3678 // Merge the decl with the existing one if appropriate. If the decl is 3679 // in an outer scope, it isn't the same thing. 3680 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3681 /*ExplicitInstantiationOrSpecialization=*/false); 3682 if (!Previous.empty()) { 3683 Redeclaration = true; 3684 MergeTypedefNameDecl(NewTD, Previous); 3685 } 3686 3687 // If this is the C FILE type, notify the AST context. 3688 if (IdentifierInfo *II = NewTD->getIdentifier()) 3689 if (!NewTD->isInvalidDecl() && 3690 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3691 if (II->isStr("FILE")) 3692 Context.setFILEDecl(NewTD); 3693 else if (II->isStr("jmp_buf")) 3694 Context.setjmp_bufDecl(NewTD); 3695 else if (II->isStr("sigjmp_buf")) 3696 Context.setsigjmp_bufDecl(NewTD); 3697 else if (II->isStr("ucontext_t")) 3698 Context.setucontext_tDecl(NewTD); 3699 else if (II->isStr("__builtin_va_list")) 3700 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3701 } 3702 3703 return NewTD; 3704} 3705 3706/// \brief Determines whether the given declaration is an out-of-scope 3707/// previous declaration. 3708/// 3709/// This routine should be invoked when name lookup has found a 3710/// previous declaration (PrevDecl) that is not in the scope where a 3711/// new declaration by the same name is being introduced. If the new 3712/// declaration occurs in a local scope, previous declarations with 3713/// linkage may still be considered previous declarations (C99 3714/// 6.2.2p4-5, C++ [basic.link]p6). 3715/// 3716/// \param PrevDecl the previous declaration found by name 3717/// lookup 3718/// 3719/// \param DC the context in which the new declaration is being 3720/// declared. 3721/// 3722/// \returns true if PrevDecl is an out-of-scope previous declaration 3723/// for a new delcaration with the same name. 3724static bool 3725isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3726 ASTContext &Context) { 3727 if (!PrevDecl) 3728 return false; 3729 3730 if (!PrevDecl->hasLinkage()) 3731 return false; 3732 3733 if (Context.getLangOptions().CPlusPlus) { 3734 // C++ [basic.link]p6: 3735 // If there is a visible declaration of an entity with linkage 3736 // having the same name and type, ignoring entities declared 3737 // outside the innermost enclosing namespace scope, the block 3738 // scope declaration declares that same entity and receives the 3739 // linkage of the previous declaration. 3740 DeclContext *OuterContext = DC->getRedeclContext(); 3741 if (!OuterContext->isFunctionOrMethod()) 3742 // This rule only applies to block-scope declarations. 3743 return false; 3744 3745 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3746 if (PrevOuterContext->isRecord()) 3747 // We found a member function: ignore it. 3748 return false; 3749 3750 // Find the innermost enclosing namespace for the new and 3751 // previous declarations. 3752 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3753 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3754 3755 // The previous declaration is in a different namespace, so it 3756 // isn't the same function. 3757 if (!OuterContext->Equals(PrevOuterContext)) 3758 return false; 3759 } 3760 3761 return true; 3762} 3763 3764static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3765 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3766 if (!SS.isSet()) return; 3767 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3768} 3769 3770bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3771 QualType type = decl->getType(); 3772 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3773 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3774 // Various kinds of declaration aren't allowed to be __autoreleasing. 3775 unsigned kind = -1U; 3776 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3777 if (var->hasAttr<BlocksAttr>()) 3778 kind = 0; // __block 3779 else if (!var->hasLocalStorage()) 3780 kind = 1; // global 3781 } else if (isa<ObjCIvarDecl>(decl)) { 3782 kind = 3; // ivar 3783 } else if (isa<FieldDecl>(decl)) { 3784 kind = 2; // field 3785 } 3786 3787 if (kind != -1U) { 3788 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3789 << kind; 3790 } 3791 } else if (lifetime == Qualifiers::OCL_None) { 3792 // Try to infer lifetime. 3793 if (!type->isObjCLifetimeType()) 3794 return false; 3795 3796 lifetime = type->getObjCARCImplicitLifetime(); 3797 type = Context.getLifetimeQualifiedType(type, lifetime); 3798 decl->setType(type); 3799 } 3800 3801 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3802 // Thread-local variables cannot have lifetime. 3803 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3804 var->isThreadSpecified()) { 3805 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3806 << var->getType(); 3807 return true; 3808 } 3809 } 3810 3811 return false; 3812} 3813 3814NamedDecl* 3815Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3816 TypeSourceInfo *TInfo, LookupResult &Previous, 3817 MultiTemplateParamsArg TemplateParamLists) { 3818 QualType R = TInfo->getType(); 3819 DeclarationName Name = GetNameForDeclarator(D).getName(); 3820 3821 // Check that there are no default arguments (C++ only). 3822 if (getLangOptions().CPlusPlus) 3823 CheckExtraCXXDefaultArguments(D); 3824 3825 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3826 assert(SCSpec != DeclSpec::SCS_typedef && 3827 "Parser allowed 'typedef' as storage class VarDecl."); 3828 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3829 if (SCSpec == DeclSpec::SCS_mutable) { 3830 // mutable can only appear on non-static class members, so it's always 3831 // an error here 3832 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3833 D.setInvalidType(); 3834 SC = SC_None; 3835 } 3836 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3837 VarDecl::StorageClass SCAsWritten 3838 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3839 3840 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3841 if (!II) { 3842 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3843 << Name; 3844 return 0; 3845 } 3846 3847 DiagnoseFunctionSpecifiers(D); 3848 3849 if (!DC->isRecord() && S->getFnParent() == 0) { 3850 // C99 6.9p2: The storage-class specifiers auto and register shall not 3851 // appear in the declaration specifiers in an external declaration. 3852 if (SC == SC_Auto || SC == SC_Register) { 3853 3854 // If this is a register variable with an asm label specified, then this 3855 // is a GNU extension. 3856 if (SC == SC_Register && D.getAsmLabel()) 3857 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3858 else 3859 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3860 D.setInvalidType(); 3861 } 3862 } 3863 3864 if (getLangOptions().OpenCL) { 3865 // Set up the special work-group-local storage class for variables in the 3866 // OpenCL __local address space. 3867 if (R.getAddressSpace() == LangAS::opencl_local) 3868 SC = SC_OpenCLWorkGroupLocal; 3869 } 3870 3871 bool isExplicitSpecialization = false; 3872 VarDecl *NewVD; 3873 if (!getLangOptions().CPlusPlus) { 3874 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3875 D.getIdentifierLoc(), II, 3876 R, TInfo, SC, SCAsWritten); 3877 3878 if (D.isInvalidType()) 3879 NewVD->setInvalidDecl(); 3880 } else { 3881 if (DC->isRecord() && !CurContext->isRecord()) { 3882 // This is an out-of-line definition of a static data member. 3883 if (SC == SC_Static) { 3884 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3885 diag::err_static_out_of_line) 3886 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3887 } else if (SC == SC_None) 3888 SC = SC_Static; 3889 } 3890 if (SC == SC_Static) { 3891 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3892 if (RD->isLocalClass()) 3893 Diag(D.getIdentifierLoc(), 3894 diag::err_static_data_member_not_allowed_in_local_class) 3895 << Name << RD->getDeclName(); 3896 3897 // C++ [class.union]p1: If a union contains a static data member, 3898 // the program is ill-formed. 3899 // 3900 // We also disallow static data members in anonymous structs. 3901 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3902 Diag(D.getIdentifierLoc(), 3903 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3904 << Name << RD->isUnion(); 3905 } 3906 } 3907 3908 // Match up the template parameter lists with the scope specifier, then 3909 // determine whether we have a template or a template specialization. 3910 isExplicitSpecialization = false; 3911 bool Invalid = false; 3912 if (TemplateParameterList *TemplateParams 3913 = MatchTemplateParametersToScopeSpecifier( 3914 D.getDeclSpec().getSourceRange().getBegin(), 3915 D.getIdentifierLoc(), 3916 D.getCXXScopeSpec(), 3917 TemplateParamLists.get(), 3918 TemplateParamLists.size(), 3919 /*never a friend*/ false, 3920 isExplicitSpecialization, 3921 Invalid)) { 3922 if (TemplateParams->size() > 0) { 3923 // There is no such thing as a variable template. 3924 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3925 << II 3926 << SourceRange(TemplateParams->getTemplateLoc(), 3927 TemplateParams->getRAngleLoc()); 3928 return 0; 3929 } else { 3930 // There is an extraneous 'template<>' for this variable. Complain 3931 // about it, but allow the declaration of the variable. 3932 Diag(TemplateParams->getTemplateLoc(), 3933 diag::err_template_variable_noparams) 3934 << II 3935 << SourceRange(TemplateParams->getTemplateLoc(), 3936 TemplateParams->getRAngleLoc()); 3937 } 3938 } 3939 3940 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3941 D.getIdentifierLoc(), II, 3942 R, TInfo, SC, SCAsWritten); 3943 3944 // If this decl has an auto type in need of deduction, make a note of the 3945 // Decl so we can diagnose uses of it in its own initializer. 3946 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3947 R->getContainedAutoType()) 3948 ParsingInitForAutoVars.insert(NewVD); 3949 3950 if (D.isInvalidType() || Invalid) 3951 NewVD->setInvalidDecl(); 3952 3953 SetNestedNameSpecifier(NewVD, D); 3954 3955 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3956 NewVD->setTemplateParameterListsInfo(Context, 3957 TemplateParamLists.size(), 3958 TemplateParamLists.release()); 3959 } 3960 3961 if (D.getDeclSpec().isConstexprSpecified()) 3962 NewVD->setConstexpr(true); 3963 } 3964 3965 // Set the lexical context. If the declarator has a C++ scope specifier, the 3966 // lexical context will be different from the semantic context. 3967 NewVD->setLexicalDeclContext(CurContext); 3968 3969 if (D.getDeclSpec().isThreadSpecified()) { 3970 if (NewVD->hasLocalStorage()) 3971 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3972 else if (!Context.getTargetInfo().isTLSSupported()) 3973 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3974 else 3975 NewVD->setThreadSpecified(true); 3976 } 3977 3978 if (D.getDeclSpec().isModulePrivateSpecified()) { 3979 if (isExplicitSpecialization) 3980 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3981 << 2 3982 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3983 else if (NewVD->hasLocalStorage()) 3984 Diag(NewVD->getLocation(), diag::err_module_private_local) 3985 << 0 << NewVD->getDeclName() 3986 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3987 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3988 else 3989 NewVD->setModulePrivate(); 3990 } 3991 3992 // Handle attributes prior to checking for duplicates in MergeVarDecl 3993 ProcessDeclAttributes(S, NewVD, D); 3994 3995 // In auto-retain/release, infer strong retension for variables of 3996 // retainable type. 3997 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3998 NewVD->setInvalidDecl(); 3999 4000 // Handle GNU asm-label extension (encoded as an attribute). 4001 if (Expr *E = (Expr*)D.getAsmLabel()) { 4002 // The parser guarantees this is a string. 4003 StringLiteral *SE = cast<StringLiteral>(E); 4004 StringRef Label = SE->getString(); 4005 if (S->getFnParent() != 0) { 4006 switch (SC) { 4007 case SC_None: 4008 case SC_Auto: 4009 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4010 break; 4011 case SC_Register: 4012 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4013 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4014 break; 4015 case SC_Static: 4016 case SC_Extern: 4017 case SC_PrivateExtern: 4018 case SC_OpenCLWorkGroupLocal: 4019 break; 4020 } 4021 } 4022 4023 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4024 Context, Label)); 4025 } 4026 4027 // Diagnose shadowed variables before filtering for scope. 4028 if (!D.getCXXScopeSpec().isSet()) 4029 CheckShadow(S, NewVD, Previous); 4030 4031 // Don't consider existing declarations that are in a different 4032 // scope and are out-of-semantic-context declarations (if the new 4033 // declaration has linkage). 4034 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4035 isExplicitSpecialization); 4036 4037 if (!getLangOptions().CPlusPlus) { 4038 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4039 } else { 4040 // Merge the decl with the existing one if appropriate. 4041 if (!Previous.empty()) { 4042 if (Previous.isSingleResult() && 4043 isa<FieldDecl>(Previous.getFoundDecl()) && 4044 D.getCXXScopeSpec().isSet()) { 4045 // The user tried to define a non-static data member 4046 // out-of-line (C++ [dcl.meaning]p1). 4047 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4048 << D.getCXXScopeSpec().getRange(); 4049 Previous.clear(); 4050 NewVD->setInvalidDecl(); 4051 } 4052 } else if (D.getCXXScopeSpec().isSet()) { 4053 // No previous declaration in the qualifying scope. 4054 Diag(D.getIdentifierLoc(), diag::err_no_member) 4055 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4056 << D.getCXXScopeSpec().getRange(); 4057 NewVD->setInvalidDecl(); 4058 } 4059 4060 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4061 4062 // This is an explicit specialization of a static data member. Check it. 4063 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4064 CheckMemberSpecialization(NewVD, Previous)) 4065 NewVD->setInvalidDecl(); 4066 } 4067 4068 // attributes declared post-definition are currently ignored 4069 // FIXME: This should be handled in attribute merging, not 4070 // here. 4071 if (Previous.isSingleResult()) { 4072 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4073 if (Def && (Def = Def->getDefinition()) && 4074 Def != NewVD && D.hasAttributes()) { 4075 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4076 Diag(Def->getLocation(), diag::note_previous_definition); 4077 } 4078 } 4079 4080 // If this is a locally-scoped extern C variable, update the map of 4081 // such variables. 4082 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4083 !NewVD->isInvalidDecl()) 4084 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4085 4086 // If there's a #pragma GCC visibility in scope, and this isn't a class 4087 // member, set the visibility of this variable. 4088 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4089 AddPushedVisibilityAttribute(NewVD); 4090 4091 MarkUnusedFileScopedDecl(NewVD); 4092 4093 return NewVD; 4094} 4095 4096/// \brief Diagnose variable or built-in function shadowing. Implements 4097/// -Wshadow. 4098/// 4099/// This method is called whenever a VarDecl is added to a "useful" 4100/// scope. 4101/// 4102/// \param S the scope in which the shadowing name is being declared 4103/// \param R the lookup of the name 4104/// 4105void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4106 // Return if warning is ignored. 4107 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4108 DiagnosticsEngine::Ignored) 4109 return; 4110 4111 // Don't diagnose declarations at file scope. 4112 if (D->hasGlobalStorage()) 4113 return; 4114 4115 DeclContext *NewDC = D->getDeclContext(); 4116 4117 // Only diagnose if we're shadowing an unambiguous field or variable. 4118 if (R.getResultKind() != LookupResult::Found) 4119 return; 4120 4121 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4122 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4123 return; 4124 4125 // Fields are not shadowed by variables in C++ static methods. 4126 if (isa<FieldDecl>(ShadowedDecl)) 4127 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4128 if (MD->isStatic()) 4129 return; 4130 4131 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4132 if (shadowedVar->isExternC()) { 4133 // For shadowing external vars, make sure that we point to the global 4134 // declaration, not a locally scoped extern declaration. 4135 for (VarDecl::redecl_iterator 4136 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4137 I != E; ++I) 4138 if (I->isFileVarDecl()) { 4139 ShadowedDecl = *I; 4140 break; 4141 } 4142 } 4143 4144 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4145 4146 // Only warn about certain kinds of shadowing for class members. 4147 if (NewDC && NewDC->isRecord()) { 4148 // In particular, don't warn about shadowing non-class members. 4149 if (!OldDC->isRecord()) 4150 return; 4151 4152 // TODO: should we warn about static data members shadowing 4153 // static data members from base classes? 4154 4155 // TODO: don't diagnose for inaccessible shadowed members. 4156 // This is hard to do perfectly because we might friend the 4157 // shadowing context, but that's just a false negative. 4158 } 4159 4160 // Determine what kind of declaration we're shadowing. 4161 unsigned Kind; 4162 if (isa<RecordDecl>(OldDC)) { 4163 if (isa<FieldDecl>(ShadowedDecl)) 4164 Kind = 3; // field 4165 else 4166 Kind = 2; // static data member 4167 } else if (OldDC->isFileContext()) 4168 Kind = 1; // global 4169 else 4170 Kind = 0; // local 4171 4172 DeclarationName Name = R.getLookupName(); 4173 4174 // Emit warning and note. 4175 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4176 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4177} 4178 4179/// \brief Check -Wshadow without the advantage of a previous lookup. 4180void Sema::CheckShadow(Scope *S, VarDecl *D) { 4181 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4182 DiagnosticsEngine::Ignored) 4183 return; 4184 4185 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4186 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4187 LookupName(R, S); 4188 CheckShadow(S, D, R); 4189} 4190 4191/// \brief Perform semantic checking on a newly-created variable 4192/// declaration. 4193/// 4194/// This routine performs all of the type-checking required for a 4195/// variable declaration once it has been built. It is used both to 4196/// check variables after they have been parsed and their declarators 4197/// have been translated into a declaration, and to check variables 4198/// that have been instantiated from a template. 4199/// 4200/// Sets NewVD->isInvalidDecl() if an error was encountered. 4201/// 4202/// Returns true if the variable declaration is a redeclaration. 4203bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4204 LookupResult &Previous) { 4205 // If the decl is already known invalid, don't check it. 4206 if (NewVD->isInvalidDecl()) 4207 return false; 4208 4209 QualType T = NewVD->getType(); 4210 4211 if (T->isObjCObjectType()) { 4212 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4213 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4214 T = Context.getObjCObjectPointerType(T); 4215 NewVD->setType(T); 4216 } 4217 4218 // Emit an error if an address space was applied to decl with local storage. 4219 // This includes arrays of objects with address space qualifiers, but not 4220 // automatic variables that point to other address spaces. 4221 // ISO/IEC TR 18037 S5.1.2 4222 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4223 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4224 NewVD->setInvalidDecl(); 4225 return false; 4226 } 4227 4228 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4229 && !NewVD->hasAttr<BlocksAttr>()) { 4230 if (getLangOptions().getGC() != LangOptions::NonGC) 4231 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4232 else 4233 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4234 } 4235 4236 bool isVM = T->isVariablyModifiedType(); 4237 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4238 NewVD->hasAttr<BlocksAttr>()) 4239 getCurFunction()->setHasBranchProtectedScope(); 4240 4241 if ((isVM && NewVD->hasLinkage()) || 4242 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4243 bool SizeIsNegative; 4244 llvm::APSInt Oversized; 4245 QualType FixedTy = 4246 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4247 Oversized); 4248 4249 if (FixedTy.isNull() && T->isVariableArrayType()) { 4250 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4251 // FIXME: This won't give the correct result for 4252 // int a[10][n]; 4253 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4254 4255 if (NewVD->isFileVarDecl()) 4256 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4257 << SizeRange; 4258 else if (NewVD->getStorageClass() == SC_Static) 4259 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4260 << SizeRange; 4261 else 4262 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4263 << SizeRange; 4264 NewVD->setInvalidDecl(); 4265 return false; 4266 } 4267 4268 if (FixedTy.isNull()) { 4269 if (NewVD->isFileVarDecl()) 4270 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4271 else 4272 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4273 NewVD->setInvalidDecl(); 4274 return false; 4275 } 4276 4277 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4278 NewVD->setType(FixedTy); 4279 } 4280 4281 if (Previous.empty() && NewVD->isExternC()) { 4282 // Since we did not find anything by this name and we're declaring 4283 // an extern "C" variable, look for a non-visible extern "C" 4284 // declaration with the same name. 4285 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4286 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4287 if (Pos != LocallyScopedExternalDecls.end()) 4288 Previous.addDecl(Pos->second); 4289 } 4290 4291 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4292 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4293 << T; 4294 NewVD->setInvalidDecl(); 4295 return false; 4296 } 4297 4298 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4299 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4300 NewVD->setInvalidDecl(); 4301 return false; 4302 } 4303 4304 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4305 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4306 NewVD->setInvalidDecl(); 4307 return false; 4308 } 4309 4310 // Function pointers and references cannot have qualified function type, only 4311 // function pointer-to-members can do that. 4312 QualType Pointee; 4313 unsigned PtrOrRef = 0; 4314 if (const PointerType *Ptr = T->getAs<PointerType>()) 4315 Pointee = Ptr->getPointeeType(); 4316 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4317 Pointee = Ref->getPointeeType(); 4318 PtrOrRef = 1; 4319 } 4320 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4321 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4322 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4323 << PtrOrRef; 4324 NewVD->setInvalidDecl(); 4325 return false; 4326 } 4327 4328 if (!Previous.empty()) { 4329 MergeVarDecl(NewVD, Previous); 4330 return true; 4331 } 4332 return false; 4333} 4334 4335/// \brief Data used with FindOverriddenMethod 4336struct FindOverriddenMethodData { 4337 Sema *S; 4338 CXXMethodDecl *Method; 4339}; 4340 4341/// \brief Member lookup function that determines whether a given C++ 4342/// method overrides a method in a base class, to be used with 4343/// CXXRecordDecl::lookupInBases(). 4344static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4345 CXXBasePath &Path, 4346 void *UserData) { 4347 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4348 4349 FindOverriddenMethodData *Data 4350 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4351 4352 DeclarationName Name = Data->Method->getDeclName(); 4353 4354 // FIXME: Do we care about other names here too? 4355 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4356 // We really want to find the base class destructor here. 4357 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4358 CanQualType CT = Data->S->Context.getCanonicalType(T); 4359 4360 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4361 } 4362 4363 for (Path.Decls = BaseRecord->lookup(Name); 4364 Path.Decls.first != Path.Decls.second; 4365 ++Path.Decls.first) { 4366 NamedDecl *D = *Path.Decls.first; 4367 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4368 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4369 return true; 4370 } 4371 } 4372 4373 return false; 4374} 4375 4376/// AddOverriddenMethods - See if a method overrides any in the base classes, 4377/// and if so, check that it's a valid override and remember it. 4378bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4379 // Look for virtual methods in base classes that this method might override. 4380 CXXBasePaths Paths; 4381 FindOverriddenMethodData Data; 4382 Data.Method = MD; 4383 Data.S = this; 4384 bool AddedAny = false; 4385 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4386 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4387 E = Paths.found_decls_end(); I != E; ++I) { 4388 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4389 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4390 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4391 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4392 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4393 AddedAny = true; 4394 } 4395 } 4396 } 4397 } 4398 4399 return AddedAny; 4400} 4401 4402namespace { 4403 // Struct for holding all of the extra arguments needed by 4404 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4405 struct ActOnFDArgs { 4406 Scope *S; 4407 Declarator &D; 4408 MultiTemplateParamsArg TemplateParamLists; 4409 bool AddToScope; 4410 }; 4411} 4412 4413/// \brief Generate diagnostics for an invalid function redeclaration. 4414/// 4415/// This routine handles generating the diagnostic messages for an invalid 4416/// function redeclaration, including finding possible similar declarations 4417/// or performing typo correction if there are no previous declarations with 4418/// the same name. 4419/// 4420/// Returns a NamedDecl iff typo correction was performed and substituting in 4421/// the new declaration name does not cause new errors. 4422static NamedDecl* DiagnoseInvalidRedeclaration( 4423 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4424 ActOnFDArgs &ExtraArgs) { 4425 NamedDecl *Result = NULL; 4426 DeclarationName Name = NewFD->getDeclName(); 4427 DeclContext *NewDC = NewFD->getDeclContext(); 4428 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4429 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4430 llvm::SmallVector<unsigned, 1> MismatchedParams; 4431 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4432 TypoCorrection Correction; 4433 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4434 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4435 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4436 : diag::err_member_def_does_not_match; 4437 4438 NewFD->setInvalidDecl(); 4439 SemaRef.LookupQualifiedName(Prev, NewDC); 4440 assert(!Prev.isAmbiguous() && 4441 "Cannot have an ambiguity in previous-declaration lookup"); 4442 if (!Prev.empty()) { 4443 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4444 Func != FuncEnd; ++Func) { 4445 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4446 if (FD && 4447 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4448 // Add 1 to the index so that 0 can mean the mismatch didn't 4449 // involve a parameter 4450 unsigned ParamNum = 4451 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4452 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4453 } 4454 } 4455 // If the qualified name lookup yielded nothing, try typo correction 4456 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4457 Prev.getLookupKind(), 0, 0, NewDC)) && 4458 Correction.getCorrection() != Name) { 4459 // Trap errors. 4460 Sema::SFINAETrap Trap(SemaRef); 4461 4462 // Set up everything for the call to ActOnFunctionDeclarator 4463 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4464 ExtraArgs.D.getIdentifierLoc()); 4465 Previous.clear(); 4466 Previous.setLookupName(Correction.getCorrection()); 4467 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4468 CDeclEnd = Correction.end(); 4469 CDecl != CDeclEnd; ++CDecl) { 4470 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4471 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4472 MismatchedParams)) { 4473 Previous.addDecl(FD); 4474 } 4475 } 4476 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4477 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4478 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4479 // eliminate the need for the parameter pack ExtraArgs. 4480 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4481 NewFD->getDeclContext(), 4482 NewFD->getTypeSourceInfo(), 4483 Previous, 4484 ExtraArgs.TemplateParamLists, 4485 ExtraArgs.AddToScope); 4486 if (Trap.hasErrorOccurred()) { 4487 // Pretend the typo correction never occurred 4488 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4489 ExtraArgs.D.getIdentifierLoc()); 4490 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4491 Previous.clear(); 4492 Previous.setLookupName(Name); 4493 Result = NULL; 4494 } else { 4495 for (LookupResult::iterator Func = Previous.begin(), 4496 FuncEnd = Previous.end(); 4497 Func != FuncEnd; ++Func) { 4498 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4499 NearMatches.push_back(std::make_pair(FD, 0)); 4500 } 4501 } 4502 if (NearMatches.empty()) { 4503 // Ignore the correction if it didn't yield any close FunctionDecl matches 4504 Correction = TypoCorrection(); 4505 } else { 4506 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4507 : diag::err_member_def_does_not_match_suggest; 4508 } 4509 } 4510 4511 if (Correction) 4512 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4513 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4514 << FixItHint::CreateReplacement( 4515 NewFD->getLocation(), 4516 Correction.getAsString(SemaRef.getLangOptions())); 4517 else 4518 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4519 << Name << NewDC << NewFD->getLocation(); 4520 4521 bool NewFDisConst = false; 4522 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4523 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4524 4525 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4526 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4527 NearMatch != NearMatchEnd; ++NearMatch) { 4528 FunctionDecl *FD = NearMatch->first; 4529 bool FDisConst = false; 4530 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4531 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4532 4533 if (unsigned Idx = NearMatch->second) { 4534 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4535 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4536 diag::note_member_def_close_param_match) 4537 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4538 } else if (Correction) { 4539 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4540 << Correction.getQuoted(SemaRef.getLangOptions()); 4541 } else if (FDisConst != NewFDisConst) { 4542 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4543 << NewFDisConst << FD->getSourceRange().getEnd(); 4544 } else 4545 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4546 } 4547 return Result; 4548} 4549 4550static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4551 Declarator &D) { 4552 switch (D.getDeclSpec().getStorageClassSpec()) { 4553 default: llvm_unreachable("Unknown storage class!"); 4554 case DeclSpec::SCS_auto: 4555 case DeclSpec::SCS_register: 4556 case DeclSpec::SCS_mutable: 4557 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4558 diag::err_typecheck_sclass_func); 4559 D.setInvalidType(); 4560 break; 4561 case DeclSpec::SCS_unspecified: break; 4562 case DeclSpec::SCS_extern: return SC_Extern; 4563 case DeclSpec::SCS_static: { 4564 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4565 // C99 6.7.1p5: 4566 // The declaration of an identifier for a function that has 4567 // block scope shall have no explicit storage-class specifier 4568 // other than extern 4569 // See also (C++ [dcl.stc]p4). 4570 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4571 diag::err_static_block_func); 4572 break; 4573 } else 4574 return SC_Static; 4575 } 4576 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4577 } 4578 4579 // No explicit storage class has already been returned 4580 return SC_None; 4581} 4582 4583static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4584 DeclContext *DC, QualType &R, 4585 TypeSourceInfo *TInfo, 4586 FunctionDecl::StorageClass SC, 4587 bool &IsVirtualOkay) { 4588 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4589 DeclarationName Name = NameInfo.getName(); 4590 4591 FunctionDecl *NewFD = 0; 4592 bool isInline = D.getDeclSpec().isInlineSpecified(); 4593 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4594 FunctionDecl::StorageClass SCAsWritten 4595 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4596 4597 if (!SemaRef.getLangOptions().CPlusPlus) { 4598 // Determine whether the function was written with a 4599 // prototype. This true when: 4600 // - there is a prototype in the declarator, or 4601 // - the type R of the function is some kind of typedef or other reference 4602 // to a type name (which eventually refers to a function type). 4603 bool HasPrototype = 4604 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4605 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4606 4607 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4608 D.getSourceRange().getBegin(), NameInfo, R, 4609 TInfo, SC, SCAsWritten, isInline, 4610 HasPrototype); 4611 if (D.isInvalidType()) 4612 NewFD->setInvalidDecl(); 4613 4614 // Set the lexical context. 4615 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4616 4617 return NewFD; 4618 } 4619 4620 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4621 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4622 4623 // Check that the return type is not an abstract class type. 4624 // For record types, this is done by the AbstractClassUsageDiagnoser once 4625 // the class has been completely parsed. 4626 if (!DC->isRecord() && 4627 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4628 R->getAs<FunctionType>()->getResultType(), 4629 diag::err_abstract_type_in_decl, 4630 SemaRef.AbstractReturnType)) 4631 D.setInvalidType(); 4632 4633 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4634 // This is a C++ constructor declaration. 4635 assert(DC->isRecord() && 4636 "Constructors can only be declared in a member context"); 4637 4638 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4639 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4640 D.getSourceRange().getBegin(), NameInfo, 4641 R, TInfo, isExplicit, isInline, 4642 /*isImplicitlyDeclared=*/false, 4643 isConstexpr); 4644 4645 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4646 // This is a C++ destructor declaration. 4647 if (DC->isRecord()) { 4648 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4649 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4650 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4651 SemaRef.Context, Record, 4652 D.getSourceRange().getBegin(), 4653 NameInfo, R, TInfo, isInline, 4654 /*isImplicitlyDeclared=*/false); 4655 4656 // If the class is complete, then we now create the implicit exception 4657 // specification. If the class is incomplete or dependent, we can't do 4658 // it yet. 4659 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4660 Record->getDefinition() && !Record->isBeingDefined() && 4661 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4662 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4663 } 4664 4665 IsVirtualOkay = true; 4666 return NewDD; 4667 4668 } else { 4669 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4670 D.setInvalidType(); 4671 4672 // Create a FunctionDecl to satisfy the function definition parsing 4673 // code path. 4674 return FunctionDecl::Create(SemaRef.Context, DC, 4675 D.getSourceRange().getBegin(), 4676 D.getIdentifierLoc(), Name, R, TInfo, 4677 SC, SCAsWritten, isInline, 4678 /*hasPrototype=*/true, isConstexpr); 4679 } 4680 4681 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4682 if (!DC->isRecord()) { 4683 SemaRef.Diag(D.getIdentifierLoc(), 4684 diag::err_conv_function_not_member); 4685 return 0; 4686 } 4687 4688 SemaRef.CheckConversionDeclarator(D, R, SC); 4689 IsVirtualOkay = true; 4690 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4691 D.getSourceRange().getBegin(), NameInfo, 4692 R, TInfo, isInline, isExplicit, 4693 isConstexpr, SourceLocation()); 4694 4695 } else if (DC->isRecord()) { 4696 // If the name of the function is the same as the name of the record, 4697 // then this must be an invalid constructor that has a return type. 4698 // (The parser checks for a return type and makes the declarator a 4699 // constructor if it has no return type). 4700 if (Name.getAsIdentifierInfo() && 4701 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4702 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4703 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4704 << SourceRange(D.getIdentifierLoc()); 4705 return 0; 4706 } 4707 4708 bool isStatic = SC == SC_Static; 4709 4710 // [class.free]p1: 4711 // Any allocation function for a class T is a static member 4712 // (even if not explicitly declared static). 4713 if (Name.getCXXOverloadedOperator() == OO_New || 4714 Name.getCXXOverloadedOperator() == OO_Array_New) 4715 isStatic = true; 4716 4717 // [class.free]p6 Any deallocation function for a class X is a static member 4718 // (even if not explicitly declared static). 4719 if (Name.getCXXOverloadedOperator() == OO_Delete || 4720 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4721 isStatic = true; 4722 4723 IsVirtualOkay = !isStatic; 4724 4725 // This is a C++ method declaration. 4726 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4727 D.getSourceRange().getBegin(), NameInfo, R, 4728 TInfo, isStatic, SCAsWritten, isInline, 4729 isConstexpr, SourceLocation()); 4730 4731 } else { 4732 // Determine whether the function was written with a 4733 // prototype. This true when: 4734 // - we're in C++ (where every function has a prototype), 4735 return FunctionDecl::Create(SemaRef.Context, DC, 4736 D.getSourceRange().getBegin(), 4737 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4738 true/*HasPrototype*/, isConstexpr); 4739 } 4740} 4741 4742NamedDecl* 4743Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4744 TypeSourceInfo *TInfo, LookupResult &Previous, 4745 MultiTemplateParamsArg TemplateParamLists, 4746 bool &AddToScope) { 4747 QualType R = TInfo->getType(); 4748 4749 assert(R.getTypePtr()->isFunctionType()); 4750 4751 // TODO: consider using NameInfo for diagnostic. 4752 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4753 DeclarationName Name = NameInfo.getName(); 4754 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4755 4756 if (D.getDeclSpec().isThreadSpecified()) 4757 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4758 4759 // Do not allow returning a objc interface by-value. 4760 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4761 Diag(D.getIdentifierLoc(), 4762 diag::err_object_cannot_be_passed_returned_by_value) << 0 4763 << R->getAs<FunctionType>()->getResultType() 4764 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4765 4766 QualType T = R->getAs<FunctionType>()->getResultType(); 4767 T = Context.getObjCObjectPointerType(T); 4768 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4769 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4770 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4771 FPT->getNumArgs(), EPI); 4772 } 4773 else if (isa<FunctionNoProtoType>(R)) 4774 R = Context.getFunctionNoProtoType(T); 4775 } 4776 4777 bool isFriend = false; 4778 FunctionTemplateDecl *FunctionTemplate = 0; 4779 bool isExplicitSpecialization = false; 4780 bool isFunctionTemplateSpecialization = false; 4781 bool isDependentClassScopeExplicitSpecialization = false; 4782 bool isVirtualOkay = false; 4783 4784 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4785 isVirtualOkay); 4786 if (!NewFD) return 0; 4787 4788 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 4789 NewFD->setTopLevelDeclInObjCContainer(); 4790 4791 if (getLangOptions().CPlusPlus) { 4792 bool isInline = D.getDeclSpec().isInlineSpecified(); 4793 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4794 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4795 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4796 isFriend = D.getDeclSpec().isFriendSpecified(); 4797 if (isFriend && !isInline && D.isFunctionDefinition()) { 4798 // C++ [class.friend]p5 4799 // A function can be defined in a friend declaration of a 4800 // class . . . . Such a function is implicitly inline. 4801 NewFD->setImplicitlyInline(); 4802 } 4803 4804 SetNestedNameSpecifier(NewFD, D); 4805 isExplicitSpecialization = false; 4806 isFunctionTemplateSpecialization = false; 4807 if (D.isInvalidType()) 4808 NewFD->setInvalidDecl(); 4809 4810 // Set the lexical context. If the declarator has a C++ 4811 // scope specifier, or is the object of a friend declaration, the 4812 // lexical context will be different from the semantic context. 4813 NewFD->setLexicalDeclContext(CurContext); 4814 4815 // Match up the template parameter lists with the scope specifier, then 4816 // determine whether we have a template or a template specialization. 4817 bool Invalid = false; 4818 if (TemplateParameterList *TemplateParams 4819 = MatchTemplateParametersToScopeSpecifier( 4820 D.getDeclSpec().getSourceRange().getBegin(), 4821 D.getIdentifierLoc(), 4822 D.getCXXScopeSpec(), 4823 TemplateParamLists.get(), 4824 TemplateParamLists.size(), 4825 isFriend, 4826 isExplicitSpecialization, 4827 Invalid)) { 4828 if (TemplateParams->size() > 0) { 4829 // This is a function template 4830 4831 // Check that we can declare a template here. 4832 if (CheckTemplateDeclScope(S, TemplateParams)) 4833 return 0; 4834 4835 // A destructor cannot be a template. 4836 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4837 Diag(NewFD->getLocation(), diag::err_destructor_template); 4838 return 0; 4839 } 4840 4841 // If we're adding a template to a dependent context, we may need to 4842 // rebuilding some of the types used within the template parameter list, 4843 // now that we know what the current instantiation is. 4844 if (DC->isDependentContext()) { 4845 ContextRAII SavedContext(*this, DC); 4846 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4847 Invalid = true; 4848 } 4849 4850 4851 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4852 NewFD->getLocation(), 4853 Name, TemplateParams, 4854 NewFD); 4855 FunctionTemplate->setLexicalDeclContext(CurContext); 4856 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4857 4858 // For source fidelity, store the other template param lists. 4859 if (TemplateParamLists.size() > 1) { 4860 NewFD->setTemplateParameterListsInfo(Context, 4861 TemplateParamLists.size() - 1, 4862 TemplateParamLists.release()); 4863 } 4864 } else { 4865 // This is a function template specialization. 4866 isFunctionTemplateSpecialization = true; 4867 // For source fidelity, store all the template param lists. 4868 NewFD->setTemplateParameterListsInfo(Context, 4869 TemplateParamLists.size(), 4870 TemplateParamLists.release()); 4871 4872 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4873 if (isFriend) { 4874 // We want to remove the "template<>", found here. 4875 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4876 4877 // If we remove the template<> and the name is not a 4878 // template-id, we're actually silently creating a problem: 4879 // the friend declaration will refer to an untemplated decl, 4880 // and clearly the user wants a template specialization. So 4881 // we need to insert '<>' after the name. 4882 SourceLocation InsertLoc; 4883 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4884 InsertLoc = D.getName().getSourceRange().getEnd(); 4885 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4886 } 4887 4888 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4889 << Name << RemoveRange 4890 << FixItHint::CreateRemoval(RemoveRange) 4891 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4892 } 4893 } 4894 } 4895 else { 4896 // All template param lists were matched against the scope specifier: 4897 // this is NOT (an explicit specialization of) a template. 4898 if (TemplateParamLists.size() > 0) 4899 // For source fidelity, store all the template param lists. 4900 NewFD->setTemplateParameterListsInfo(Context, 4901 TemplateParamLists.size(), 4902 TemplateParamLists.release()); 4903 } 4904 4905 if (Invalid) { 4906 NewFD->setInvalidDecl(); 4907 if (FunctionTemplate) 4908 FunctionTemplate->setInvalidDecl(); 4909 } 4910 4911 // If we see "T var();" at block scope, where T is a class type, it is 4912 // probably an attempt to initialize a variable, not a function declaration. 4913 // We don't catch this case earlier, since there is no ambiguity here. 4914 if (!FunctionTemplate && D.getFunctionDefinitionKind() == FDK_Declaration && 4915 CurContext->isFunctionOrMethod() && 4916 D.getNumTypeObjects() == 1 && D.isFunctionDeclarator() && 4917 D.getDeclSpec().getStorageClassSpecAsWritten() 4918 == DeclSpec::SCS_unspecified) { 4919 QualType T = R->getAs<FunctionType>()->getResultType(); 4920 DeclaratorChunk &C = D.getTypeObject(0); 4921 if (!T->isVoidType() && C.Fun.NumArgs == 0 && !C.Fun.isVariadic && 4922 !C.Fun.TrailingReturnType && 4923 C.Fun.getExceptionSpecType() == EST_None) { 4924 SourceRange ParenRange(C.Loc, C.EndLoc); 4925 Diag(C.Loc, diag::warn_empty_parens_are_function_decl) << ParenRange; 4926 4927 // If the declaration looks like: 4928 // T var1, 4929 // f(); 4930 // and name lookup finds a function named 'f', then the ',' was 4931 // probably intended to be a ';'. 4932 if (!D.isFirstDeclarator() && D.getIdentifier()) { 4933 FullSourceLoc Comma(D.getCommaLoc(), SourceMgr); 4934 FullSourceLoc Name(D.getIdentifierLoc(), SourceMgr); 4935 if (Comma.getFileID() != Name.getFileID() || 4936 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 4937 LookupResult Result(*this, D.getIdentifier(), SourceLocation(), 4938 LookupOrdinaryName); 4939 if (LookupName(Result, S)) 4940 Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 4941 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") << NewFD; 4942 } 4943 } 4944 const CXXRecordDecl *RD = T->getAsCXXRecordDecl(); 4945 // Empty parens mean value-initialization, and no parens mean default 4946 // initialization. These are equivalent if the default constructor is 4947 // user-provided, or if zero-initialization is a no-op. 4948 if (RD && RD->hasDefinition() && 4949 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 4950 Diag(C.Loc, diag::note_empty_parens_default_ctor) 4951 << FixItHint::CreateRemoval(ParenRange); 4952 else if (const char *Init = getFixItZeroInitializerForType(T)) 4953 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 4954 << FixItHint::CreateReplacement(ParenRange, Init); 4955 else if (LangOpts.CPlusPlus0x) 4956 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 4957 << FixItHint::CreateReplacement(ParenRange, "{}"); 4958 } 4959 } 4960 4961 // C++ [dcl.fct.spec]p5: 4962 // The virtual specifier shall only be used in declarations of 4963 // nonstatic class member functions that appear within a 4964 // member-specification of a class declaration; see 10.3. 4965 // 4966 if (isVirtual && !NewFD->isInvalidDecl()) { 4967 if (!isVirtualOkay) { 4968 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4969 diag::err_virtual_non_function); 4970 } else if (!CurContext->isRecord()) { 4971 // 'virtual' was specified outside of the class. 4972 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4973 diag::err_virtual_out_of_class) 4974 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4975 } else if (NewFD->getDescribedFunctionTemplate()) { 4976 // C++ [temp.mem]p3: 4977 // A member function template shall not be virtual. 4978 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4979 diag::err_virtual_member_function_template) 4980 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4981 } else { 4982 // Okay: Add virtual to the method. 4983 NewFD->setVirtualAsWritten(true); 4984 } 4985 } 4986 4987 // C++ [dcl.fct.spec]p3: 4988 // The inline specifier shall not appear on a block scope function 4989 // declaration. 4990 if (isInline && !NewFD->isInvalidDecl()) { 4991 if (CurContext->isFunctionOrMethod()) { 4992 // 'inline' is not allowed on block scope function declaration. 4993 Diag(D.getDeclSpec().getInlineSpecLoc(), 4994 diag::err_inline_declaration_block_scope) << Name 4995 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4996 } 4997 } 4998 4999 // C++ [dcl.fct.spec]p6: 5000 // The explicit specifier shall be used only in the declaration of a 5001 // constructor or conversion function within its class definition; 5002 // see 12.3.1 and 12.3.2. 5003 if (isExplicit && !NewFD->isInvalidDecl()) { 5004 if (!CurContext->isRecord()) { 5005 // 'explicit' was specified outside of the class. 5006 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5007 diag::err_explicit_out_of_class) 5008 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5009 } else if (!isa<CXXConstructorDecl>(NewFD) && 5010 !isa<CXXConversionDecl>(NewFD)) { 5011 // 'explicit' was specified on a function that wasn't a constructor 5012 // or conversion function. 5013 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5014 diag::err_explicit_non_ctor_or_conv_function) 5015 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5016 } 5017 } 5018 5019 if (isConstexpr) { 5020 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 5021 // are implicitly inline. 5022 NewFD->setImplicitlyInline(); 5023 5024 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 5025 // be either constructors or to return a literal type. Therefore, 5026 // destructors cannot be declared constexpr. 5027 if (isa<CXXDestructorDecl>(NewFD)) 5028 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 5029 } 5030 5031 // If __module_private__ was specified, mark the function accordingly. 5032 if (D.getDeclSpec().isModulePrivateSpecified()) { 5033 if (isFunctionTemplateSpecialization) { 5034 SourceLocation ModulePrivateLoc 5035 = D.getDeclSpec().getModulePrivateSpecLoc(); 5036 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5037 << 0 5038 << FixItHint::CreateRemoval(ModulePrivateLoc); 5039 } else { 5040 NewFD->setModulePrivate(); 5041 if (FunctionTemplate) 5042 FunctionTemplate->setModulePrivate(); 5043 } 5044 } 5045 5046 if (isFriend) { 5047 // For now, claim that the objects have no previous declaration. 5048 if (FunctionTemplate) { 5049 FunctionTemplate->setObjectOfFriendDecl(false); 5050 FunctionTemplate->setAccess(AS_public); 5051 } 5052 NewFD->setObjectOfFriendDecl(false); 5053 NewFD->setAccess(AS_public); 5054 } 5055 5056 // If a function is defined as defaulted or deleted, mark it as such now. 5057 switch (D.getFunctionDefinitionKind()) { 5058 case FDK_Declaration: 5059 case FDK_Definition: 5060 break; 5061 5062 case FDK_Defaulted: 5063 NewFD->setDefaulted(); 5064 break; 5065 5066 case FDK_Deleted: 5067 NewFD->setDeletedAsWritten(); 5068 break; 5069 } 5070 5071 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5072 D.isFunctionDefinition()) { 5073 // C++ [class.mfct]p2: 5074 // A member function may be defined (8.4) in its class definition, in 5075 // which case it is an inline member function (7.1.2) 5076 NewFD->setImplicitlyInline(); 5077 } 5078 5079 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5080 !CurContext->isRecord()) { 5081 // C++ [class.static]p1: 5082 // A data or function member of a class may be declared static 5083 // in a class definition, in which case it is a static member of 5084 // the class. 5085 5086 // Complain about the 'static' specifier if it's on an out-of-line 5087 // member function definition. 5088 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5089 diag::err_static_out_of_line) 5090 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5091 } 5092 } 5093 5094 // Filter out previous declarations that don't match the scope. 5095 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5096 isExplicitSpecialization || 5097 isFunctionTemplateSpecialization); 5098 5099 // Handle GNU asm-label extension (encoded as an attribute). 5100 if (Expr *E = (Expr*) D.getAsmLabel()) { 5101 // The parser guarantees this is a string. 5102 StringLiteral *SE = cast<StringLiteral>(E); 5103 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5104 SE->getString())); 5105 } 5106 5107 // Copy the parameter declarations from the declarator D to the function 5108 // declaration NewFD, if they are available. First scavenge them into Params. 5109 SmallVector<ParmVarDecl*, 16> Params; 5110 if (D.isFunctionDeclarator()) { 5111 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5112 5113 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5114 // function that takes no arguments, not a function that takes a 5115 // single void argument. 5116 // We let through "const void" here because Sema::GetTypeForDeclarator 5117 // already checks for that case. 5118 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5119 FTI.ArgInfo[0].Param && 5120 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5121 // Empty arg list, don't push any params. 5122 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5123 5124 // In C++, the empty parameter-type-list must be spelled "void"; a 5125 // typedef of void is not permitted. 5126 if (getLangOptions().CPlusPlus && 5127 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5128 bool IsTypeAlias = false; 5129 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5130 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5131 else if (const TemplateSpecializationType *TST = 5132 Param->getType()->getAs<TemplateSpecializationType>()) 5133 IsTypeAlias = TST->isTypeAlias(); 5134 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5135 << IsTypeAlias; 5136 } 5137 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5138 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5139 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5140 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5141 Param->setDeclContext(NewFD); 5142 Params.push_back(Param); 5143 5144 if (Param->isInvalidDecl()) 5145 NewFD->setInvalidDecl(); 5146 } 5147 } 5148 5149 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5150 // When we're declaring a function with a typedef, typeof, etc as in the 5151 // following example, we'll need to synthesize (unnamed) 5152 // parameters for use in the declaration. 5153 // 5154 // @code 5155 // typedef void fn(int); 5156 // fn f; 5157 // @endcode 5158 5159 // Synthesize a parameter for each argument type. 5160 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5161 AE = FT->arg_type_end(); AI != AE; ++AI) { 5162 ParmVarDecl *Param = 5163 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5164 Param->setScopeInfo(0, Params.size()); 5165 Params.push_back(Param); 5166 } 5167 } else { 5168 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5169 "Should not need args for typedef of non-prototype fn"); 5170 } 5171 5172 // Finally, we know we have the right number of parameters, install them. 5173 NewFD->setParams(Params); 5174 5175 // Process the non-inheritable attributes on this declaration. 5176 ProcessDeclAttributes(S, NewFD, D, 5177 /*NonInheritable=*/true, /*Inheritable=*/false); 5178 5179 if (!getLangOptions().CPlusPlus) { 5180 // Perform semantic checking on the function declaration. 5181 bool isExplicitSpecialization=false; 5182 if (!NewFD->isInvalidDecl()) { 5183 if (NewFD->getResultType()->isVariablyModifiedType()) { 5184 // Functions returning a variably modified type violate C99 6.7.5.2p2 5185 // because all functions have linkage. 5186 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5187 NewFD->setInvalidDecl(); 5188 } else { 5189 if (NewFD->isMain()) 5190 CheckMain(NewFD, D.getDeclSpec()); 5191 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5192 isExplicitSpecialization)); 5193 } 5194 } 5195 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5196 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5197 "previous declaration set still overloaded"); 5198 } else { 5199 // If the declarator is a template-id, translate the parser's template 5200 // argument list into our AST format. 5201 bool HasExplicitTemplateArgs = false; 5202 TemplateArgumentListInfo TemplateArgs; 5203 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5204 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5205 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5206 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5207 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5208 TemplateId->getTemplateArgs(), 5209 TemplateId->NumArgs); 5210 translateTemplateArguments(TemplateArgsPtr, 5211 TemplateArgs); 5212 TemplateArgsPtr.release(); 5213 5214 HasExplicitTemplateArgs = true; 5215 5216 if (NewFD->isInvalidDecl()) { 5217 HasExplicitTemplateArgs = false; 5218 } else if (FunctionTemplate) { 5219 // Function template with explicit template arguments. 5220 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5221 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5222 5223 HasExplicitTemplateArgs = false; 5224 } else if (!isFunctionTemplateSpecialization && 5225 !D.getDeclSpec().isFriendSpecified()) { 5226 // We have encountered something that the user meant to be a 5227 // specialization (because it has explicitly-specified template 5228 // arguments) but that was not introduced with a "template<>" (or had 5229 // too few of them). 5230 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5231 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5232 << FixItHint::CreateInsertion( 5233 D.getDeclSpec().getSourceRange().getBegin(), 5234 "template<> "); 5235 isFunctionTemplateSpecialization = true; 5236 } else { 5237 // "friend void foo<>(int);" is an implicit specialization decl. 5238 isFunctionTemplateSpecialization = true; 5239 } 5240 } else if (isFriend && isFunctionTemplateSpecialization) { 5241 // This combination is only possible in a recovery case; the user 5242 // wrote something like: 5243 // template <> friend void foo(int); 5244 // which we're recovering from as if the user had written: 5245 // friend void foo<>(int); 5246 // Go ahead and fake up a template id. 5247 HasExplicitTemplateArgs = true; 5248 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5249 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5250 } 5251 5252 // If it's a friend (and only if it's a friend), it's possible 5253 // that either the specialized function type or the specialized 5254 // template is dependent, and therefore matching will fail. In 5255 // this case, don't check the specialization yet. 5256 bool InstantiationDependent = false; 5257 if (isFunctionTemplateSpecialization && isFriend && 5258 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5259 TemplateSpecializationType::anyDependentTemplateArguments( 5260 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5261 InstantiationDependent))) { 5262 assert(HasExplicitTemplateArgs && 5263 "friend function specialization without template args"); 5264 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5265 Previous)) 5266 NewFD->setInvalidDecl(); 5267 } else if (isFunctionTemplateSpecialization) { 5268 if (CurContext->isDependentContext() && CurContext->isRecord() 5269 && !isFriend) { 5270 isDependentClassScopeExplicitSpecialization = true; 5271 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5272 diag::ext_function_specialization_in_class : 5273 diag::err_function_specialization_in_class) 5274 << NewFD->getDeclName(); 5275 } else if (CheckFunctionTemplateSpecialization(NewFD, 5276 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5277 Previous)) 5278 NewFD->setInvalidDecl(); 5279 5280 // C++ [dcl.stc]p1: 5281 // A storage-class-specifier shall not be specified in an explicit 5282 // specialization (14.7.3) 5283 if (SC != SC_None) { 5284 if (SC != NewFD->getStorageClass()) 5285 Diag(NewFD->getLocation(), 5286 diag::err_explicit_specialization_inconsistent_storage_class) 5287 << SC 5288 << FixItHint::CreateRemoval( 5289 D.getDeclSpec().getStorageClassSpecLoc()); 5290 5291 else 5292 Diag(NewFD->getLocation(), 5293 diag::ext_explicit_specialization_storage_class) 5294 << FixItHint::CreateRemoval( 5295 D.getDeclSpec().getStorageClassSpecLoc()); 5296 } 5297 5298 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5299 if (CheckMemberSpecialization(NewFD, Previous)) 5300 NewFD->setInvalidDecl(); 5301 } 5302 5303 // Perform semantic checking on the function declaration. 5304 if (!isDependentClassScopeExplicitSpecialization) { 5305 if (NewFD->isInvalidDecl()) { 5306 // If this is a class member, mark the class invalid immediately. 5307 // This avoids some consistency errors later. 5308 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5309 methodDecl->getParent()->setInvalidDecl(); 5310 } else { 5311 if (NewFD->isMain()) 5312 CheckMain(NewFD, D.getDeclSpec()); 5313 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5314 isExplicitSpecialization)); 5315 } 5316 } 5317 5318 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5319 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5320 "previous declaration set still overloaded"); 5321 5322 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5323 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5324 NewFD->setInvalidDecl(); 5325 5326 NamedDecl *PrincipalDecl = (FunctionTemplate 5327 ? cast<NamedDecl>(FunctionTemplate) 5328 : NewFD); 5329 5330 if (isFriend && D.isRedeclaration()) { 5331 AccessSpecifier Access = AS_public; 5332 if (!NewFD->isInvalidDecl()) 5333 Access = NewFD->getPreviousDeclaration()->getAccess(); 5334 5335 NewFD->setAccess(Access); 5336 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5337 5338 PrincipalDecl->setObjectOfFriendDecl(true); 5339 } 5340 5341 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5342 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5343 PrincipalDecl->setNonMemberOperator(); 5344 5345 // If we have a function template, check the template parameter 5346 // list. This will check and merge default template arguments. 5347 if (FunctionTemplate) { 5348 FunctionTemplateDecl *PrevTemplate = 5349 FunctionTemplate->getPreviousDeclaration(); 5350 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5351 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5352 D.getDeclSpec().isFriendSpecified() 5353 ? (D.isFunctionDefinition() 5354 ? TPC_FriendFunctionTemplateDefinition 5355 : TPC_FriendFunctionTemplate) 5356 : (D.getCXXScopeSpec().isSet() && 5357 DC && DC->isRecord() && 5358 DC->isDependentContext()) 5359 ? TPC_ClassTemplateMember 5360 : TPC_FunctionTemplate); 5361 } 5362 5363 if (NewFD->isInvalidDecl()) { 5364 // Ignore all the rest of this. 5365 } else if (!D.isRedeclaration()) { 5366 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5367 AddToScope }; 5368 // Fake up an access specifier if it's supposed to be a class member. 5369 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5370 NewFD->setAccess(AS_public); 5371 5372 // Qualified decls generally require a previous declaration. 5373 if (D.getCXXScopeSpec().isSet()) { 5374 // ...with the major exception of templated-scope or 5375 // dependent-scope friend declarations. 5376 5377 // TODO: we currently also suppress this check in dependent 5378 // contexts because (1) the parameter depth will be off when 5379 // matching friend templates and (2) we might actually be 5380 // selecting a friend based on a dependent factor. But there 5381 // are situations where these conditions don't apply and we 5382 // can actually do this check immediately. 5383 if (isFriend && 5384 (TemplateParamLists.size() || 5385 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5386 CurContext->isDependentContext())) { 5387 // ignore these 5388 } else { 5389 // The user tried to provide an out-of-line definition for a 5390 // function that is a member of a class or namespace, but there 5391 // was no such member function declared (C++ [class.mfct]p2, 5392 // C++ [namespace.memdef]p2). For example: 5393 // 5394 // class X { 5395 // void f() const; 5396 // }; 5397 // 5398 // void X::f() { } // ill-formed 5399 // 5400 // Complain about this problem, and attempt to suggest close 5401 // matches (e.g., those that differ only in cv-qualifiers and 5402 // whether the parameter types are references). 5403 5404 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5405 NewFD, 5406 ExtraArgs)) { 5407 AddToScope = ExtraArgs.AddToScope; 5408 return Result; 5409 } 5410 } 5411 5412 // Unqualified local friend declarations are required to resolve 5413 // to something. 5414 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5415 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5416 NewFD, 5417 ExtraArgs)) { 5418 AddToScope = ExtraArgs.AddToScope; 5419 return Result; 5420 } 5421 } 5422 5423 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5424 !isFriend && !isFunctionTemplateSpecialization && 5425 !isExplicitSpecialization) { 5426 // An out-of-line member function declaration must also be a 5427 // definition (C++ [dcl.meaning]p1). 5428 // Note that this is not the case for explicit specializations of 5429 // function templates or member functions of class templates, per 5430 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5431 // extension for compatibility with old SWIG code which likes to 5432 // generate them. 5433 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5434 << D.getCXXScopeSpec().getRange(); 5435 } 5436 } 5437 5438 5439 // Handle attributes. We need to have merged decls when handling attributes 5440 // (for example to check for conflicts, etc). 5441 // FIXME: This needs to happen before we merge declarations. Then, 5442 // let attribute merging cope with attribute conflicts. 5443 ProcessDeclAttributes(S, NewFD, D, 5444 /*NonInheritable=*/false, /*Inheritable=*/true); 5445 5446 // attributes declared post-definition are currently ignored 5447 // FIXME: This should happen during attribute merging 5448 if (D.isRedeclaration() && Previous.isSingleResult()) { 5449 const FunctionDecl *Def; 5450 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5451 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5452 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5453 Diag(Def->getLocation(), diag::note_previous_definition); 5454 } 5455 } 5456 5457 AddKnownFunctionAttributes(NewFD); 5458 5459 if (NewFD->hasAttr<OverloadableAttr>() && 5460 !NewFD->getType()->getAs<FunctionProtoType>()) { 5461 Diag(NewFD->getLocation(), 5462 diag::err_attribute_overloadable_no_prototype) 5463 << NewFD; 5464 5465 // Turn this into a variadic function with no parameters. 5466 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5467 FunctionProtoType::ExtProtoInfo EPI; 5468 EPI.Variadic = true; 5469 EPI.ExtInfo = FT->getExtInfo(); 5470 5471 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5472 NewFD->setType(R); 5473 } 5474 5475 // If there's a #pragma GCC visibility in scope, and this isn't a class 5476 // member, set the visibility of this function. 5477 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5478 AddPushedVisibilityAttribute(NewFD); 5479 5480 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5481 // marking the function. 5482 AddCFAuditedAttribute(NewFD); 5483 5484 // If this is a locally-scoped extern C function, update the 5485 // map of such names. 5486 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5487 && !NewFD->isInvalidDecl()) 5488 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5489 5490 // Set this FunctionDecl's range up to the right paren. 5491 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5492 5493 if (getLangOptions().CPlusPlus) { 5494 if (FunctionTemplate) { 5495 if (NewFD->isInvalidDecl()) 5496 FunctionTemplate->setInvalidDecl(); 5497 return FunctionTemplate; 5498 } 5499 } 5500 5501 MarkUnusedFileScopedDecl(NewFD); 5502 5503 if (getLangOptions().CUDA) 5504 if (IdentifierInfo *II = NewFD->getIdentifier()) 5505 if (!NewFD->isInvalidDecl() && 5506 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5507 if (II->isStr("cudaConfigureCall")) { 5508 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5509 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5510 5511 Context.setcudaConfigureCallDecl(NewFD); 5512 } 5513 } 5514 5515 // Here we have an function template explicit specialization at class scope. 5516 // The actually specialization will be postponed to template instatiation 5517 // time via the ClassScopeFunctionSpecializationDecl node. 5518 if (isDependentClassScopeExplicitSpecialization) { 5519 ClassScopeFunctionSpecializationDecl *NewSpec = 5520 ClassScopeFunctionSpecializationDecl::Create( 5521 Context, CurContext, SourceLocation(), 5522 cast<CXXMethodDecl>(NewFD)); 5523 CurContext->addDecl(NewSpec); 5524 AddToScope = false; 5525 } 5526 5527 return NewFD; 5528} 5529 5530/// \brief Perform semantic checking of a new function declaration. 5531/// 5532/// Performs semantic analysis of the new function declaration 5533/// NewFD. This routine performs all semantic checking that does not 5534/// require the actual declarator involved in the declaration, and is 5535/// used both for the declaration of functions as they are parsed 5536/// (called via ActOnDeclarator) and for the declaration of functions 5537/// that have been instantiated via C++ template instantiation (called 5538/// via InstantiateDecl). 5539/// 5540/// \param IsExplicitSpecialiation whether this new function declaration is 5541/// an explicit specialization of the previous declaration. 5542/// 5543/// This sets NewFD->isInvalidDecl() to true if there was an error. 5544/// 5545/// Returns true if the function declaration is a redeclaration. 5546bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5547 LookupResult &Previous, 5548 bool IsExplicitSpecialization) { 5549 assert(!NewFD->getResultType()->isVariablyModifiedType() 5550 && "Variably modified return types are not handled here"); 5551 5552 // Check for a previous declaration of this name. 5553 if (Previous.empty() && NewFD->isExternC()) { 5554 // Since we did not find anything by this name and we're declaring 5555 // an extern "C" function, look for a non-visible extern "C" 5556 // declaration with the same name. 5557 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5558 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5559 if (Pos != LocallyScopedExternalDecls.end()) 5560 Previous.addDecl(Pos->second); 5561 } 5562 5563 bool Redeclaration = false; 5564 5565 // Merge or overload the declaration with an existing declaration of 5566 // the same name, if appropriate. 5567 if (!Previous.empty()) { 5568 // Determine whether NewFD is an overload of PrevDecl or 5569 // a declaration that requires merging. If it's an overload, 5570 // there's no more work to do here; we'll just add the new 5571 // function to the scope. 5572 5573 NamedDecl *OldDecl = 0; 5574 if (!AllowOverloadingOfFunction(Previous, Context)) { 5575 Redeclaration = true; 5576 OldDecl = Previous.getFoundDecl(); 5577 } else { 5578 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5579 /*NewIsUsingDecl*/ false)) { 5580 case Ovl_Match: 5581 Redeclaration = true; 5582 break; 5583 5584 case Ovl_NonFunction: 5585 Redeclaration = true; 5586 break; 5587 5588 case Ovl_Overload: 5589 Redeclaration = false; 5590 break; 5591 } 5592 5593 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5594 // If a function name is overloadable in C, then every function 5595 // with that name must be marked "overloadable". 5596 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5597 << Redeclaration << NewFD; 5598 NamedDecl *OverloadedDecl = 0; 5599 if (Redeclaration) 5600 OverloadedDecl = OldDecl; 5601 else if (!Previous.empty()) 5602 OverloadedDecl = Previous.getRepresentativeDecl(); 5603 if (OverloadedDecl) 5604 Diag(OverloadedDecl->getLocation(), 5605 diag::note_attribute_overloadable_prev_overload); 5606 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5607 Context)); 5608 } 5609 } 5610 5611 if (Redeclaration) { 5612 // NewFD and OldDecl represent declarations that need to be 5613 // merged. 5614 if (MergeFunctionDecl(NewFD, OldDecl)) { 5615 NewFD->setInvalidDecl(); 5616 return Redeclaration; 5617 } 5618 5619 Previous.clear(); 5620 Previous.addDecl(OldDecl); 5621 5622 if (FunctionTemplateDecl *OldTemplateDecl 5623 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5624 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5625 FunctionTemplateDecl *NewTemplateDecl 5626 = NewFD->getDescribedFunctionTemplate(); 5627 assert(NewTemplateDecl && "Template/non-template mismatch"); 5628 if (CXXMethodDecl *Method 5629 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5630 Method->setAccess(OldTemplateDecl->getAccess()); 5631 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5632 } 5633 5634 // If this is an explicit specialization of a member that is a function 5635 // template, mark it as a member specialization. 5636 if (IsExplicitSpecialization && 5637 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5638 NewTemplateDecl->setMemberSpecialization(); 5639 assert(OldTemplateDecl->isMemberSpecialization()); 5640 } 5641 5642 } else { 5643 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5644 NewFD->setAccess(OldDecl->getAccess()); 5645 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5646 } 5647 } 5648 } 5649 5650 // Semantic checking for this function declaration (in isolation). 5651 if (getLangOptions().CPlusPlus) { 5652 // C++-specific checks. 5653 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5654 CheckConstructor(Constructor); 5655 } else if (CXXDestructorDecl *Destructor = 5656 dyn_cast<CXXDestructorDecl>(NewFD)) { 5657 CXXRecordDecl *Record = Destructor->getParent(); 5658 QualType ClassType = Context.getTypeDeclType(Record); 5659 5660 // FIXME: Shouldn't we be able to perform this check even when the class 5661 // type is dependent? Both gcc and edg can handle that. 5662 if (!ClassType->isDependentType()) { 5663 DeclarationName Name 5664 = Context.DeclarationNames.getCXXDestructorName( 5665 Context.getCanonicalType(ClassType)); 5666 if (NewFD->getDeclName() != Name) { 5667 Diag(NewFD->getLocation(), diag::err_destructor_name); 5668 NewFD->setInvalidDecl(); 5669 return Redeclaration; 5670 } 5671 } 5672 } else if (CXXConversionDecl *Conversion 5673 = dyn_cast<CXXConversionDecl>(NewFD)) { 5674 ActOnConversionDeclarator(Conversion); 5675 } 5676 5677 // Find any virtual functions that this function overrides. 5678 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5679 if (!Method->isFunctionTemplateSpecialization() && 5680 !Method->getDescribedFunctionTemplate()) { 5681 if (AddOverriddenMethods(Method->getParent(), Method)) { 5682 // If the function was marked as "static", we have a problem. 5683 if (NewFD->getStorageClass() == SC_Static) { 5684 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5685 << NewFD->getDeclName(); 5686 for (CXXMethodDecl::method_iterator 5687 Overridden = Method->begin_overridden_methods(), 5688 OverriddenEnd = Method->end_overridden_methods(); 5689 Overridden != OverriddenEnd; 5690 ++Overridden) { 5691 Diag((*Overridden)->getLocation(), 5692 diag::note_overridden_virtual_function); 5693 } 5694 } 5695 } 5696 } 5697 } 5698 5699 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5700 if (NewFD->isOverloadedOperator() && 5701 CheckOverloadedOperatorDeclaration(NewFD)) { 5702 NewFD->setInvalidDecl(); 5703 return Redeclaration; 5704 } 5705 5706 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5707 if (NewFD->getLiteralIdentifier() && 5708 CheckLiteralOperatorDeclaration(NewFD)) { 5709 NewFD->setInvalidDecl(); 5710 return Redeclaration; 5711 } 5712 5713 // In C++, check default arguments now that we have merged decls. Unless 5714 // the lexical context is the class, because in this case this is done 5715 // during delayed parsing anyway. 5716 if (!CurContext->isRecord()) 5717 CheckCXXDefaultArguments(NewFD); 5718 5719 // If this function declares a builtin function, check the type of this 5720 // declaration against the expected type for the builtin. 5721 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5722 ASTContext::GetBuiltinTypeError Error; 5723 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5724 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5725 // The type of this function differs from the type of the builtin, 5726 // so forget about the builtin entirely. 5727 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5728 } 5729 } 5730 } 5731 return Redeclaration; 5732} 5733 5734void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5735 // C++ [basic.start.main]p3: A program that declares main to be inline 5736 // or static is ill-formed. 5737 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5738 // shall not appear in a declaration of main. 5739 // static main is not an error under C99, but we should warn about it. 5740 if (FD->getStorageClass() == SC_Static) 5741 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5742 ? diag::err_static_main : diag::warn_static_main) 5743 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5744 if (FD->isInlineSpecified()) 5745 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5746 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5747 5748 QualType T = FD->getType(); 5749 assert(T->isFunctionType() && "function decl is not of function type"); 5750 const FunctionType* FT = T->getAs<FunctionType>(); 5751 5752 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5753 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5754 FD->setInvalidDecl(true); 5755 } 5756 5757 // Treat protoless main() as nullary. 5758 if (isa<FunctionNoProtoType>(FT)) return; 5759 5760 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5761 unsigned nparams = FTP->getNumArgs(); 5762 assert(FD->getNumParams() == nparams); 5763 5764 bool HasExtraParameters = (nparams > 3); 5765 5766 // Darwin passes an undocumented fourth argument of type char**. If 5767 // other platforms start sprouting these, the logic below will start 5768 // getting shifty. 5769 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5770 HasExtraParameters = false; 5771 5772 if (HasExtraParameters) { 5773 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5774 FD->setInvalidDecl(true); 5775 nparams = 3; 5776 } 5777 5778 // FIXME: a lot of the following diagnostics would be improved 5779 // if we had some location information about types. 5780 5781 QualType CharPP = 5782 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5783 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5784 5785 for (unsigned i = 0; i < nparams; ++i) { 5786 QualType AT = FTP->getArgType(i); 5787 5788 bool mismatch = true; 5789 5790 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5791 mismatch = false; 5792 else if (Expected[i] == CharPP) { 5793 // As an extension, the following forms are okay: 5794 // char const ** 5795 // char const * const * 5796 // char * const * 5797 5798 QualifierCollector qs; 5799 const PointerType* PT; 5800 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5801 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5802 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5803 qs.removeConst(); 5804 mismatch = !qs.empty(); 5805 } 5806 } 5807 5808 if (mismatch) { 5809 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5810 // TODO: suggest replacing given type with expected type 5811 FD->setInvalidDecl(true); 5812 } 5813 } 5814 5815 if (nparams == 1 && !FD->isInvalidDecl()) { 5816 Diag(FD->getLocation(), diag::warn_main_one_arg); 5817 } 5818 5819 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5820 Diag(FD->getLocation(), diag::err_main_template_decl); 5821 FD->setInvalidDecl(); 5822 } 5823} 5824 5825bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5826 // FIXME: Need strict checking. In C89, we need to check for 5827 // any assignment, increment, decrement, function-calls, or 5828 // commas outside of a sizeof. In C99, it's the same list, 5829 // except that the aforementioned are allowed in unevaluated 5830 // expressions. Everything else falls under the 5831 // "may accept other forms of constant expressions" exception. 5832 // (We never end up here for C++, so the constant expression 5833 // rules there don't matter.) 5834 if (Init->isConstantInitializer(Context, false)) 5835 return false; 5836 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5837 << Init->getSourceRange(); 5838 return true; 5839} 5840 5841namespace { 5842 // Visits an initialization expression to see if OrigDecl is evaluated in 5843 // its own initialization and throws a warning if it does. 5844 class SelfReferenceChecker 5845 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5846 Sema &S; 5847 Decl *OrigDecl; 5848 bool isRecordType; 5849 bool isPODType; 5850 5851 public: 5852 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5853 5854 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5855 S(S), OrigDecl(OrigDecl) { 5856 isPODType = false; 5857 isRecordType = false; 5858 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5859 isPODType = VD->getType().isPODType(S.Context); 5860 isRecordType = VD->getType()->isRecordType(); 5861 } 5862 } 5863 5864 void VisitExpr(Expr *E) { 5865 if (isa<ObjCMessageExpr>(*E)) return; 5866 if (isRecordType) { 5867 Expr *expr = E; 5868 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5869 ValueDecl *VD = ME->getMemberDecl(); 5870 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5871 expr = ME->getBase(); 5872 } 5873 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5874 HandleDeclRefExpr(DRE); 5875 return; 5876 } 5877 } 5878 Inherited::VisitExpr(E); 5879 } 5880 5881 void VisitMemberExpr(MemberExpr *E) { 5882 if (E->getType()->canDecayToPointerType()) return; 5883 if (isa<FieldDecl>(E->getMemberDecl())) 5884 if (DeclRefExpr *DRE 5885 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5886 HandleDeclRefExpr(DRE); 5887 return; 5888 } 5889 Inherited::VisitMemberExpr(E); 5890 } 5891 5892 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5893 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5894 (isRecordType && E->getCastKind() == CK_NoOp)) { 5895 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5896 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5897 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5898 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5899 HandleDeclRefExpr(DRE); 5900 return; 5901 } 5902 } 5903 Inherited::VisitImplicitCastExpr(E); 5904 } 5905 5906 void VisitUnaryOperator(UnaryOperator *E) { 5907 // For POD record types, addresses of its own members are well-defined. 5908 if (isRecordType && isPODType) return; 5909 Inherited::VisitUnaryOperator(E); 5910 } 5911 5912 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5913 Decl* ReferenceDecl = DRE->getDecl(); 5914 if (OrigDecl != ReferenceDecl) return; 5915 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5916 Sema::NotForRedeclaration); 5917 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5918 S.PDiag(diag::warn_uninit_self_reference_in_init) 5919 << Result.getLookupName() 5920 << OrigDecl->getLocation() 5921 << DRE->getSourceRange()); 5922 } 5923 }; 5924} 5925 5926/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5927void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5928 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5929} 5930 5931/// AddInitializerToDecl - Adds the initializer Init to the 5932/// declaration dcl. If DirectInit is true, this is C++ direct 5933/// initialization rather than copy initialization. 5934void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5935 bool DirectInit, bool TypeMayContainAuto) { 5936 // If there is no declaration, there was an error parsing it. Just ignore 5937 // the initializer. 5938 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5939 return; 5940 5941 // Check for self-references within variable initializers. 5942 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5943 // Variables declared within a function/method body are handled 5944 // by a dataflow analysis. 5945 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5946 CheckSelfReference(RealDecl, Init); 5947 } 5948 else { 5949 CheckSelfReference(RealDecl, Init); 5950 } 5951 5952 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5953 // With declarators parsed the way they are, the parser cannot 5954 // distinguish between a normal initializer and a pure-specifier. 5955 // Thus this grotesque test. 5956 IntegerLiteral *IL; 5957 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5958 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5959 CheckPureMethod(Method, Init->getSourceRange()); 5960 else { 5961 Diag(Method->getLocation(), diag::err_member_function_initialization) 5962 << Method->getDeclName() << Init->getSourceRange(); 5963 Method->setInvalidDecl(); 5964 } 5965 return; 5966 } 5967 5968 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5969 if (!VDecl) { 5970 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5971 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5972 RealDecl->setInvalidDecl(); 5973 return; 5974 } 5975 5976 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5977 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5978 TypeSourceInfo *DeducedType = 0; 5979 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5980 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5981 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5982 << Init->getSourceRange(); 5983 if (!DeducedType) { 5984 RealDecl->setInvalidDecl(); 5985 return; 5986 } 5987 VDecl->setTypeSourceInfo(DeducedType); 5988 VDecl->setType(DeducedType->getType()); 5989 5990 // In ARC, infer lifetime. 5991 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5992 VDecl->setInvalidDecl(); 5993 5994 // If this is a redeclaration, check that the type we just deduced matches 5995 // the previously declared type. 5996 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5997 MergeVarDeclTypes(VDecl, Old); 5998 } 5999 6000 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 6001 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 6002 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6003 VDecl->setInvalidDecl(); 6004 return; 6005 } 6006 6007 6008 // A definition must end up with a complete type, which means it must be 6009 // complete with the restriction that an array type might be completed by the 6010 // initializer; note that later code assumes this restriction. 6011 QualType BaseDeclType = VDecl->getType(); 6012 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 6013 BaseDeclType = Array->getElementType(); 6014 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 6015 diag::err_typecheck_decl_incomplete_type)) { 6016 RealDecl->setInvalidDecl(); 6017 return; 6018 } 6019 6020 // The variable can not have an abstract class type. 6021 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6022 diag::err_abstract_type_in_decl, 6023 AbstractVariableType)) 6024 VDecl->setInvalidDecl(); 6025 6026 const VarDecl *Def; 6027 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6028 Diag(VDecl->getLocation(), diag::err_redefinition) 6029 << VDecl->getDeclName(); 6030 Diag(Def->getLocation(), diag::note_previous_definition); 6031 VDecl->setInvalidDecl(); 6032 return; 6033 } 6034 6035 const VarDecl* PrevInit = 0; 6036 if (getLangOptions().CPlusPlus) { 6037 // C++ [class.static.data]p4 6038 // If a static data member is of const integral or const 6039 // enumeration type, its declaration in the class definition can 6040 // specify a constant-initializer which shall be an integral 6041 // constant expression (5.19). In that case, the member can appear 6042 // in integral constant expressions. The member shall still be 6043 // defined in a namespace scope if it is used in the program and the 6044 // namespace scope definition shall not contain an initializer. 6045 // 6046 // We already performed a redefinition check above, but for static 6047 // data members we also need to check whether there was an in-class 6048 // declaration with an initializer. 6049 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6050 Diag(VDecl->getLocation(), diag::err_redefinition) 6051 << VDecl->getDeclName(); 6052 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6053 return; 6054 } 6055 6056 if (VDecl->hasLocalStorage()) 6057 getCurFunction()->setHasBranchProtectedScope(); 6058 6059 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6060 VDecl->setInvalidDecl(); 6061 return; 6062 } 6063 } 6064 6065 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6066 // a kernel function cannot be initialized." 6067 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6068 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6069 VDecl->setInvalidDecl(); 6070 return; 6071 } 6072 6073 // Get the decls type and save a reference for later, since 6074 // CheckInitializerTypes may change it. 6075 QualType DclT = VDecl->getType(), SavT = DclT; 6076 6077 // Perform the initialization. 6078 if (!VDecl->isInvalidDecl()) { 6079 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6080 InitializationKind Kind 6081 = DirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6082 Init->getLocStart(), 6083 Init->getLocEnd()) 6084 : InitializationKind::CreateCopy(VDecl->getLocation(), 6085 Init->getLocStart()); 6086 6087 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6088 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6089 MultiExprArg(*this, &Init, 1), 6090 &DclT); 6091 if (Result.isInvalid()) { 6092 VDecl->setInvalidDecl(); 6093 return; 6094 } 6095 6096 Init = Result.takeAs<Expr>(); 6097 } 6098 6099 // If the type changed, it means we had an incomplete type that was 6100 // completed by the initializer. For example: 6101 // int ary[] = { 1, 3, 5 }; 6102 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6103 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6104 VDecl->setType(DclT); 6105 Init->setType(DclT.getNonReferenceType()); 6106 } 6107 6108 // Check any implicit conversions within the expression. 6109 CheckImplicitConversions(Init, VDecl->getLocation()); 6110 6111 if (!VDecl->isInvalidDecl()) 6112 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6113 6114 Init = MaybeCreateExprWithCleanups(Init); 6115 // Attach the initializer to the decl. 6116 VDecl->setInit(Init); 6117 6118 if (VDecl->isLocalVarDecl()) { 6119 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6120 // static storage duration shall be constant expressions or string literals. 6121 // C++ does not have this restriction. 6122 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl() && 6123 VDecl->getStorageClass() == SC_Static) 6124 CheckForConstantInitializer(Init, DclT); 6125 } else if (VDecl->isStaticDataMember() && 6126 VDecl->getLexicalDeclContext()->isRecord()) { 6127 // This is an in-class initialization for a static data member, e.g., 6128 // 6129 // struct S { 6130 // static const int value = 17; 6131 // }; 6132 6133 // C++ [class.mem]p4: 6134 // A member-declarator can contain a constant-initializer only 6135 // if it declares a static member (9.4) of const integral or 6136 // const enumeration type, see 9.4.2. 6137 // 6138 // C++11 [class.static.data]p3: 6139 // If a non-volatile const static data member is of integral or 6140 // enumeration type, its declaration in the class definition can 6141 // specify a brace-or-equal-initializer in which every initalizer-clause 6142 // that is an assignment-expression is a constant expression. A static 6143 // data member of literal type can be declared in the class definition 6144 // with the constexpr specifier; if so, its declaration shall specify a 6145 // brace-or-equal-initializer in which every initializer-clause that is 6146 // an assignment-expression is a constant expression. 6147 6148 // Do nothing on dependent types. 6149 if (DclT->isDependentType()) { 6150 6151 // Allow any 'static constexpr' members, whether or not they are of literal 6152 // type. We separately check that the initializer is a constant expression, 6153 // which implicitly requires the member to be of literal type. 6154 } else if (VDecl->isConstexpr()) { 6155 6156 // Require constness. 6157 } else if (!DclT.isConstQualified()) { 6158 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6159 << Init->getSourceRange(); 6160 VDecl->setInvalidDecl(); 6161 6162 // We allow integer constant expressions in all cases. 6163 } else if (DclT->isIntegralOrEnumerationType()) { 6164 // Check whether the expression is a constant expression. 6165 SourceLocation Loc; 6166 if (getLangOptions().CPlusPlus0x && DclT.isVolatileQualified()) 6167 // In C++11, a non-constexpr const static data member with an 6168 // in-class initializer cannot be volatile. 6169 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6170 else if (Init->isValueDependent()) 6171 ; // Nothing to check. 6172 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6173 ; // Ok, it's an ICE! 6174 else if (Init->isEvaluatable(Context)) { 6175 // If we can constant fold the initializer through heroics, accept it, 6176 // but report this as a use of an extension for -pedantic. 6177 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6178 << Init->getSourceRange(); 6179 } else { 6180 // Otherwise, this is some crazy unknown case. Report the issue at the 6181 // location provided by the isIntegerConstantExpr failed check. 6182 Diag(Loc, diag::err_in_class_initializer_non_constant) 6183 << Init->getSourceRange(); 6184 VDecl->setInvalidDecl(); 6185 } 6186 6187 // We allow foldable floating-point constants as an extension. 6188 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6189 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6190 << DclT << Init->getSourceRange(); 6191 if (getLangOptions().CPlusPlus0x) 6192 Diag(VDecl->getLocation(), 6193 diag::note_in_class_initializer_float_type_constexpr) 6194 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6195 6196 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6197 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6198 << Init->getSourceRange(); 6199 VDecl->setInvalidDecl(); 6200 } 6201 6202 // Suggest adding 'constexpr' in C++11 for literal types. 6203 } else if (getLangOptions().CPlusPlus0x && DclT->isLiteralType()) { 6204 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6205 << DclT << Init->getSourceRange() 6206 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6207 VDecl->setConstexpr(true); 6208 6209 } else { 6210 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6211 << DclT << Init->getSourceRange(); 6212 VDecl->setInvalidDecl(); 6213 } 6214 } else if (VDecl->isFileVarDecl()) { 6215 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6216 (!getLangOptions().CPlusPlus || 6217 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6218 Diag(VDecl->getLocation(), diag::warn_extern_init); 6219 6220 // C99 6.7.8p4. All file scoped initializers need to be constant. 6221 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) 6222 CheckForConstantInitializer(Init, DclT); 6223 } 6224 6225 CheckCompleteVariableDeclaration(VDecl); 6226} 6227 6228/// ActOnInitializerError - Given that there was an error parsing an 6229/// initializer for the given declaration, try to return to some form 6230/// of sanity. 6231void Sema::ActOnInitializerError(Decl *D) { 6232 // Our main concern here is re-establishing invariants like "a 6233 // variable's type is either dependent or complete". 6234 if (!D || D->isInvalidDecl()) return; 6235 6236 VarDecl *VD = dyn_cast<VarDecl>(D); 6237 if (!VD) return; 6238 6239 // Auto types are meaningless if we can't make sense of the initializer. 6240 if (ParsingInitForAutoVars.count(D)) { 6241 D->setInvalidDecl(); 6242 return; 6243 } 6244 6245 QualType Ty = VD->getType(); 6246 if (Ty->isDependentType()) return; 6247 6248 // Require a complete type. 6249 if (RequireCompleteType(VD->getLocation(), 6250 Context.getBaseElementType(Ty), 6251 diag::err_typecheck_decl_incomplete_type)) { 6252 VD->setInvalidDecl(); 6253 return; 6254 } 6255 6256 // Require an abstract type. 6257 if (RequireNonAbstractType(VD->getLocation(), Ty, 6258 diag::err_abstract_type_in_decl, 6259 AbstractVariableType)) { 6260 VD->setInvalidDecl(); 6261 return; 6262 } 6263 6264 // Don't bother complaining about constructors or destructors, 6265 // though. 6266} 6267 6268void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6269 bool TypeMayContainAuto) { 6270 // If there is no declaration, there was an error parsing it. Just ignore it. 6271 if (RealDecl == 0) 6272 return; 6273 6274 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6275 QualType Type = Var->getType(); 6276 6277 // C++11 [dcl.spec.auto]p3 6278 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6279 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6280 << Var->getDeclName() << Type; 6281 Var->setInvalidDecl(); 6282 return; 6283 } 6284 6285 // C++11 [class.static.data]p3: A static data member can be declared with 6286 // the constexpr specifier; if so, its declaration shall specify 6287 // a brace-or-equal-initializer. 6288 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6289 // the definition of a variable [...] or the declaration of a static data 6290 // member. 6291 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6292 if (Var->isStaticDataMember()) 6293 Diag(Var->getLocation(), 6294 diag::err_constexpr_static_mem_var_requires_init) 6295 << Var->getDeclName(); 6296 else 6297 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6298 Var->setInvalidDecl(); 6299 return; 6300 } 6301 6302 switch (Var->isThisDeclarationADefinition()) { 6303 case VarDecl::Definition: 6304 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6305 break; 6306 6307 // We have an out-of-line definition of a static data member 6308 // that has an in-class initializer, so we type-check this like 6309 // a declaration. 6310 // 6311 // Fall through 6312 6313 case VarDecl::DeclarationOnly: 6314 // It's only a declaration. 6315 6316 // Block scope. C99 6.7p7: If an identifier for an object is 6317 // declared with no linkage (C99 6.2.2p6), the type for the 6318 // object shall be complete. 6319 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6320 !Var->getLinkage() && !Var->isInvalidDecl() && 6321 RequireCompleteType(Var->getLocation(), Type, 6322 diag::err_typecheck_decl_incomplete_type)) 6323 Var->setInvalidDecl(); 6324 6325 // Make sure that the type is not abstract. 6326 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6327 RequireNonAbstractType(Var->getLocation(), Type, 6328 diag::err_abstract_type_in_decl, 6329 AbstractVariableType)) 6330 Var->setInvalidDecl(); 6331 return; 6332 6333 case VarDecl::TentativeDefinition: 6334 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6335 // object that has file scope without an initializer, and without a 6336 // storage-class specifier or with the storage-class specifier "static", 6337 // constitutes a tentative definition. Note: A tentative definition with 6338 // external linkage is valid (C99 6.2.2p5). 6339 if (!Var->isInvalidDecl()) { 6340 if (const IncompleteArrayType *ArrayT 6341 = Context.getAsIncompleteArrayType(Type)) { 6342 if (RequireCompleteType(Var->getLocation(), 6343 ArrayT->getElementType(), 6344 diag::err_illegal_decl_array_incomplete_type)) 6345 Var->setInvalidDecl(); 6346 } else if (Var->getStorageClass() == SC_Static) { 6347 // C99 6.9.2p3: If the declaration of an identifier for an object is 6348 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6349 // declared type shall not be an incomplete type. 6350 // NOTE: code such as the following 6351 // static struct s; 6352 // struct s { int a; }; 6353 // is accepted by gcc. Hence here we issue a warning instead of 6354 // an error and we do not invalidate the static declaration. 6355 // NOTE: to avoid multiple warnings, only check the first declaration. 6356 if (Var->getPreviousDeclaration() == 0) 6357 RequireCompleteType(Var->getLocation(), Type, 6358 diag::ext_typecheck_decl_incomplete_type); 6359 } 6360 } 6361 6362 // Record the tentative definition; we're done. 6363 if (!Var->isInvalidDecl()) 6364 TentativeDefinitions.push_back(Var); 6365 return; 6366 } 6367 6368 // Provide a specific diagnostic for uninitialized variable 6369 // definitions with incomplete array type. 6370 if (Type->isIncompleteArrayType()) { 6371 Diag(Var->getLocation(), 6372 diag::err_typecheck_incomplete_array_needs_initializer); 6373 Var->setInvalidDecl(); 6374 return; 6375 } 6376 6377 // Provide a specific diagnostic for uninitialized variable 6378 // definitions with reference type. 6379 if (Type->isReferenceType()) { 6380 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6381 << Var->getDeclName() 6382 << SourceRange(Var->getLocation(), Var->getLocation()); 6383 Var->setInvalidDecl(); 6384 return; 6385 } 6386 6387 // Do not attempt to type-check the default initializer for a 6388 // variable with dependent type. 6389 if (Type->isDependentType()) 6390 return; 6391 6392 if (Var->isInvalidDecl()) 6393 return; 6394 6395 if (RequireCompleteType(Var->getLocation(), 6396 Context.getBaseElementType(Type), 6397 diag::err_typecheck_decl_incomplete_type)) { 6398 Var->setInvalidDecl(); 6399 return; 6400 } 6401 6402 // The variable can not have an abstract class type. 6403 if (RequireNonAbstractType(Var->getLocation(), Type, 6404 diag::err_abstract_type_in_decl, 6405 AbstractVariableType)) { 6406 Var->setInvalidDecl(); 6407 return; 6408 } 6409 6410 // Check for jumps past the implicit initializer. C++0x 6411 // clarifies that this applies to a "variable with automatic 6412 // storage duration", not a "local variable". 6413 // C++11 [stmt.dcl]p3 6414 // A program that jumps from a point where a variable with automatic 6415 // storage duration is not in scope to a point where it is in scope is 6416 // ill-formed unless the variable has scalar type, class type with a 6417 // trivial default constructor and a trivial destructor, a cv-qualified 6418 // version of one of these types, or an array of one of the preceding 6419 // types and is declared without an initializer. 6420 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6421 if (const RecordType *Record 6422 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6423 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6424 // Mark the function for further checking even if the looser rules of 6425 // C++11 do not require such checks, so that we can diagnose 6426 // incompatibilities with C++98. 6427 if (!CXXRecord->isPOD()) 6428 getCurFunction()->setHasBranchProtectedScope(); 6429 } 6430 } 6431 6432 // C++03 [dcl.init]p9: 6433 // If no initializer is specified for an object, and the 6434 // object is of (possibly cv-qualified) non-POD class type (or 6435 // array thereof), the object shall be default-initialized; if 6436 // the object is of const-qualified type, the underlying class 6437 // type shall have a user-declared default 6438 // constructor. Otherwise, if no initializer is specified for 6439 // a non- static object, the object and its subobjects, if 6440 // any, have an indeterminate initial value); if the object 6441 // or any of its subobjects are of const-qualified type, the 6442 // program is ill-formed. 6443 // C++0x [dcl.init]p11: 6444 // If no initializer is specified for an object, the object is 6445 // default-initialized; [...]. 6446 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6447 InitializationKind Kind 6448 = InitializationKind::CreateDefault(Var->getLocation()); 6449 6450 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6451 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6452 MultiExprArg(*this, 0, 0)); 6453 if (Init.isInvalid()) 6454 Var->setInvalidDecl(); 6455 else if (Init.get()) 6456 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6457 6458 CheckCompleteVariableDeclaration(Var); 6459 } 6460} 6461 6462void Sema::ActOnCXXForRangeDecl(Decl *D) { 6463 VarDecl *VD = dyn_cast<VarDecl>(D); 6464 if (!VD) { 6465 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6466 D->setInvalidDecl(); 6467 return; 6468 } 6469 6470 VD->setCXXForRangeDecl(true); 6471 6472 // for-range-declaration cannot be given a storage class specifier. 6473 int Error = -1; 6474 switch (VD->getStorageClassAsWritten()) { 6475 case SC_None: 6476 break; 6477 case SC_Extern: 6478 Error = 0; 6479 break; 6480 case SC_Static: 6481 Error = 1; 6482 break; 6483 case SC_PrivateExtern: 6484 Error = 2; 6485 break; 6486 case SC_Auto: 6487 Error = 3; 6488 break; 6489 case SC_Register: 6490 Error = 4; 6491 break; 6492 case SC_OpenCLWorkGroupLocal: 6493 llvm_unreachable("Unexpected storage class"); 6494 } 6495 if (VD->isConstexpr()) 6496 Error = 5; 6497 if (Error != -1) { 6498 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6499 << VD->getDeclName() << Error; 6500 D->setInvalidDecl(); 6501 } 6502} 6503 6504void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6505 if (var->isInvalidDecl()) return; 6506 6507 // In ARC, don't allow jumps past the implicit initialization of a 6508 // local retaining variable. 6509 if (getLangOptions().ObjCAutoRefCount && 6510 var->hasLocalStorage()) { 6511 switch (var->getType().getObjCLifetime()) { 6512 case Qualifiers::OCL_None: 6513 case Qualifiers::OCL_ExplicitNone: 6514 case Qualifiers::OCL_Autoreleasing: 6515 break; 6516 6517 case Qualifiers::OCL_Weak: 6518 case Qualifiers::OCL_Strong: 6519 getCurFunction()->setHasBranchProtectedScope(); 6520 break; 6521 } 6522 } 6523 6524 // All the following checks are C++ only. 6525 if (!getLangOptions().CPlusPlus) return; 6526 6527 QualType baseType = Context.getBaseElementType(var->getType()); 6528 if (baseType->isDependentType()) return; 6529 6530 // __block variables might require us to capture a copy-initializer. 6531 if (var->hasAttr<BlocksAttr>()) { 6532 // It's currently invalid to ever have a __block variable with an 6533 // array type; should we diagnose that here? 6534 6535 // Regardless, we don't want to ignore array nesting when 6536 // constructing this copy. 6537 QualType type = var->getType(); 6538 6539 if (type->isStructureOrClassType()) { 6540 SourceLocation poi = var->getLocation(); 6541 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6542 ExprResult result = 6543 PerformCopyInitialization( 6544 InitializedEntity::InitializeBlock(poi, type, false), 6545 poi, Owned(varRef)); 6546 if (!result.isInvalid()) { 6547 result = MaybeCreateExprWithCleanups(result); 6548 Expr *init = result.takeAs<Expr>(); 6549 Context.setBlockVarCopyInits(var, init); 6550 } 6551 } 6552 } 6553 6554 Expr *Init = var->getInit(); 6555 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6556 6557 if (!var->getDeclContext()->isDependentContext() && Init) { 6558 if (IsGlobal && !var->isConstexpr() && 6559 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6560 var->getLocation()) 6561 != DiagnosticsEngine::Ignored && 6562 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 6563 Diag(var->getLocation(), diag::warn_global_constructor) 6564 << Init->getSourceRange(); 6565 6566 if (var->isConstexpr()) { 6567 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 6568 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 6569 SourceLocation DiagLoc = var->getLocation(); 6570 // If the note doesn't add any useful information other than a source 6571 // location, fold it into the primary diagnostic. 6572 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 6573 diag::note_invalid_subexpr_in_const_expr) { 6574 DiagLoc = Notes[0].first; 6575 Notes.clear(); 6576 } 6577 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 6578 << var << Init->getSourceRange(); 6579 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 6580 Diag(Notes[I].first, Notes[I].second); 6581 } 6582 } else if (var->isUsableInConstantExpressions()) { 6583 // Check whether the initializer of a const variable of integral or 6584 // enumeration type is an ICE now, since we can't tell whether it was 6585 // initialized by a constant expression if we check later. 6586 var->checkInitIsICE(); 6587 } 6588 } 6589 6590 // Require the destructor. 6591 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6592 FinalizeVarWithDestructor(var, recordType); 6593} 6594 6595/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6596/// any semantic actions necessary after any initializer has been attached. 6597void 6598Sema::FinalizeDeclaration(Decl *ThisDecl) { 6599 // Note that we are no longer parsing the initializer for this declaration. 6600 ParsingInitForAutoVars.erase(ThisDecl); 6601} 6602 6603Sema::DeclGroupPtrTy 6604Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6605 Decl **Group, unsigned NumDecls) { 6606 SmallVector<Decl*, 8> Decls; 6607 6608 if (DS.isTypeSpecOwned()) 6609 Decls.push_back(DS.getRepAsDecl()); 6610 6611 for (unsigned i = 0; i != NumDecls; ++i) 6612 if (Decl *D = Group[i]) 6613 Decls.push_back(D); 6614 6615 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6616 DS.getTypeSpecType() == DeclSpec::TST_auto); 6617} 6618 6619/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6620/// group, performing any necessary semantic checking. 6621Sema::DeclGroupPtrTy 6622Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6623 bool TypeMayContainAuto) { 6624 // C++0x [dcl.spec.auto]p7: 6625 // If the type deduced for the template parameter U is not the same in each 6626 // deduction, the program is ill-formed. 6627 // FIXME: When initializer-list support is added, a distinction is needed 6628 // between the deduced type U and the deduced type which 'auto' stands for. 6629 // auto a = 0, b = { 1, 2, 3 }; 6630 // is legal because the deduced type U is 'int' in both cases. 6631 if (TypeMayContainAuto && NumDecls > 1) { 6632 QualType Deduced; 6633 CanQualType DeducedCanon; 6634 VarDecl *DeducedDecl = 0; 6635 for (unsigned i = 0; i != NumDecls; ++i) { 6636 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6637 AutoType *AT = D->getType()->getContainedAutoType(); 6638 // Don't reissue diagnostics when instantiating a template. 6639 if (AT && D->isInvalidDecl()) 6640 break; 6641 if (AT && AT->isDeduced()) { 6642 QualType U = AT->getDeducedType(); 6643 CanQualType UCanon = Context.getCanonicalType(U); 6644 if (Deduced.isNull()) { 6645 Deduced = U; 6646 DeducedCanon = UCanon; 6647 DeducedDecl = D; 6648 } else if (DeducedCanon != UCanon) { 6649 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6650 diag::err_auto_different_deductions) 6651 << Deduced << DeducedDecl->getDeclName() 6652 << U << D->getDeclName() 6653 << DeducedDecl->getInit()->getSourceRange() 6654 << D->getInit()->getSourceRange(); 6655 D->setInvalidDecl(); 6656 break; 6657 } 6658 } 6659 } 6660 } 6661 } 6662 6663 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6664} 6665 6666 6667/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6668/// to introduce parameters into function prototype scope. 6669Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6670 const DeclSpec &DS = D.getDeclSpec(); 6671 6672 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6673 // C++03 [dcl.stc]p2 also permits 'auto'. 6674 VarDecl::StorageClass StorageClass = SC_None; 6675 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6676 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6677 StorageClass = SC_Register; 6678 StorageClassAsWritten = SC_Register; 6679 } else if (getLangOptions().CPlusPlus && 6680 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6681 StorageClass = SC_Auto; 6682 StorageClassAsWritten = SC_Auto; 6683 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6684 Diag(DS.getStorageClassSpecLoc(), 6685 diag::err_invalid_storage_class_in_func_decl); 6686 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6687 } 6688 6689 if (D.getDeclSpec().isThreadSpecified()) 6690 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6691 if (D.getDeclSpec().isConstexprSpecified()) 6692 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6693 << 0; 6694 6695 DiagnoseFunctionSpecifiers(D); 6696 6697 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6698 QualType parmDeclType = TInfo->getType(); 6699 6700 if (getLangOptions().CPlusPlus) { 6701 // Check that there are no default arguments inside the type of this 6702 // parameter. 6703 CheckExtraCXXDefaultArguments(D); 6704 6705 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6706 if (D.getCXXScopeSpec().isSet()) { 6707 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6708 << D.getCXXScopeSpec().getRange(); 6709 D.getCXXScopeSpec().clear(); 6710 } 6711 } 6712 6713 // Ensure we have a valid name 6714 IdentifierInfo *II = 0; 6715 if (D.hasName()) { 6716 II = D.getIdentifier(); 6717 if (!II) { 6718 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6719 << GetNameForDeclarator(D).getName().getAsString(); 6720 D.setInvalidType(true); 6721 } 6722 } 6723 6724 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6725 if (II) { 6726 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6727 ForRedeclaration); 6728 LookupName(R, S); 6729 if (R.isSingleResult()) { 6730 NamedDecl *PrevDecl = R.getFoundDecl(); 6731 if (PrevDecl->isTemplateParameter()) { 6732 // Maybe we will complain about the shadowed template parameter. 6733 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6734 // Just pretend that we didn't see the previous declaration. 6735 PrevDecl = 0; 6736 } else if (S->isDeclScope(PrevDecl)) { 6737 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6738 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6739 6740 // Recover by removing the name 6741 II = 0; 6742 D.SetIdentifier(0, D.getIdentifierLoc()); 6743 D.setInvalidType(true); 6744 } 6745 } 6746 } 6747 6748 // Temporarily put parameter variables in the translation unit, not 6749 // the enclosing context. This prevents them from accidentally 6750 // looking like class members in C++. 6751 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6752 D.getSourceRange().getBegin(), 6753 D.getIdentifierLoc(), II, 6754 parmDeclType, TInfo, 6755 StorageClass, StorageClassAsWritten); 6756 6757 if (D.isInvalidType()) 6758 New->setInvalidDecl(); 6759 6760 assert(S->isFunctionPrototypeScope()); 6761 assert(S->getFunctionPrototypeDepth() >= 1); 6762 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6763 S->getNextFunctionPrototypeIndex()); 6764 6765 // Add the parameter declaration into this scope. 6766 S->AddDecl(New); 6767 if (II) 6768 IdResolver.AddDecl(New); 6769 6770 ProcessDeclAttributes(S, New, D); 6771 6772 if (D.getDeclSpec().isModulePrivateSpecified()) 6773 Diag(New->getLocation(), diag::err_module_private_local) 6774 << 1 << New->getDeclName() 6775 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6776 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6777 6778 if (New->hasAttr<BlocksAttr>()) { 6779 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6780 } 6781 return New; 6782} 6783 6784/// \brief Synthesizes a variable for a parameter arising from a 6785/// typedef. 6786ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6787 SourceLocation Loc, 6788 QualType T) { 6789 /* FIXME: setting StartLoc == Loc. 6790 Would it be worth to modify callers so as to provide proper source 6791 location for the unnamed parameters, embedding the parameter's type? */ 6792 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6793 T, Context.getTrivialTypeSourceInfo(T, Loc), 6794 SC_None, SC_None, 0); 6795 Param->setImplicit(); 6796 return Param; 6797} 6798 6799void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6800 ParmVarDecl * const *ParamEnd) { 6801 // Don't diagnose unused-parameter errors in template instantiations; we 6802 // will already have done so in the template itself. 6803 if (!ActiveTemplateInstantiations.empty()) 6804 return; 6805 6806 for (; Param != ParamEnd; ++Param) { 6807 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6808 !(*Param)->hasAttr<UnusedAttr>()) { 6809 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6810 << (*Param)->getDeclName(); 6811 } 6812 } 6813} 6814 6815void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6816 ParmVarDecl * const *ParamEnd, 6817 QualType ReturnTy, 6818 NamedDecl *D) { 6819 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6820 return; 6821 6822 // Warn if the return value is pass-by-value and larger than the specified 6823 // threshold. 6824 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 6825 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6826 if (Size > LangOpts.NumLargeByValueCopy) 6827 Diag(D->getLocation(), diag::warn_return_value_size) 6828 << D->getDeclName() << Size; 6829 } 6830 6831 // Warn if any parameter is pass-by-value and larger than the specified 6832 // threshold. 6833 for (; Param != ParamEnd; ++Param) { 6834 QualType T = (*Param)->getType(); 6835 if (T->isDependentType() || !T.isPODType(Context)) 6836 continue; 6837 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6838 if (Size > LangOpts.NumLargeByValueCopy) 6839 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6840 << (*Param)->getDeclName() << Size; 6841 } 6842} 6843 6844ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6845 SourceLocation NameLoc, IdentifierInfo *Name, 6846 QualType T, TypeSourceInfo *TSInfo, 6847 VarDecl::StorageClass StorageClass, 6848 VarDecl::StorageClass StorageClassAsWritten) { 6849 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6850 if (getLangOptions().ObjCAutoRefCount && 6851 T.getObjCLifetime() == Qualifiers::OCL_None && 6852 T->isObjCLifetimeType()) { 6853 6854 Qualifiers::ObjCLifetime lifetime; 6855 6856 // Special cases for arrays: 6857 // - if it's const, use __unsafe_unretained 6858 // - otherwise, it's an error 6859 if (T->isArrayType()) { 6860 if (!T.isConstQualified()) { 6861 DelayedDiagnostics.add( 6862 sema::DelayedDiagnostic::makeForbiddenType( 6863 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6864 } 6865 lifetime = Qualifiers::OCL_ExplicitNone; 6866 } else { 6867 lifetime = T->getObjCARCImplicitLifetime(); 6868 } 6869 T = Context.getLifetimeQualifiedType(T, lifetime); 6870 } 6871 6872 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6873 Context.getAdjustedParameterType(T), 6874 TSInfo, 6875 StorageClass, StorageClassAsWritten, 6876 0); 6877 6878 // Parameters can not be abstract class types. 6879 // For record types, this is done by the AbstractClassUsageDiagnoser once 6880 // the class has been completely parsed. 6881 if (!CurContext->isRecord() && 6882 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6883 AbstractParamType)) 6884 New->setInvalidDecl(); 6885 6886 // Parameter declarators cannot be interface types. All ObjC objects are 6887 // passed by reference. 6888 if (T->isObjCObjectType()) { 6889 Diag(NameLoc, 6890 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6891 << FixItHint::CreateInsertion(NameLoc, "*"); 6892 T = Context.getObjCObjectPointerType(T); 6893 New->setType(T); 6894 } 6895 6896 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6897 // duration shall not be qualified by an address-space qualifier." 6898 // Since all parameters have automatic store duration, they can not have 6899 // an address space. 6900 if (T.getAddressSpace() != 0) { 6901 Diag(NameLoc, diag::err_arg_with_address_space); 6902 New->setInvalidDecl(); 6903 } 6904 6905 return New; 6906} 6907 6908void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6909 SourceLocation LocAfterDecls) { 6910 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6911 6912 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6913 // for a K&R function. 6914 if (!FTI.hasPrototype) { 6915 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6916 --i; 6917 if (FTI.ArgInfo[i].Param == 0) { 6918 llvm::SmallString<256> Code; 6919 llvm::raw_svector_ostream(Code) << " int " 6920 << FTI.ArgInfo[i].Ident->getName() 6921 << ";\n"; 6922 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6923 << FTI.ArgInfo[i].Ident 6924 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6925 6926 // Implicitly declare the argument as type 'int' for lack of a better 6927 // type. 6928 AttributeFactory attrs; 6929 DeclSpec DS(attrs); 6930 const char* PrevSpec; // unused 6931 unsigned DiagID; // unused 6932 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6933 PrevSpec, DiagID); 6934 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6935 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6936 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6937 } 6938 } 6939 } 6940} 6941 6942Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6943 Declarator &D) { 6944 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6945 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6946 Scope *ParentScope = FnBodyScope->getParent(); 6947 6948 D.setFunctionDefinitionKind(FDK_Definition); 6949 Decl *DP = HandleDeclarator(ParentScope, D, 6950 MultiTemplateParamsArg(*this)); 6951 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6952} 6953 6954static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6955 // Don't warn about invalid declarations. 6956 if (FD->isInvalidDecl()) 6957 return false; 6958 6959 // Or declarations that aren't global. 6960 if (!FD->isGlobal()) 6961 return false; 6962 6963 // Don't warn about C++ member functions. 6964 if (isa<CXXMethodDecl>(FD)) 6965 return false; 6966 6967 // Don't warn about 'main'. 6968 if (FD->isMain()) 6969 return false; 6970 6971 // Don't warn about inline functions. 6972 if (FD->isInlined()) 6973 return false; 6974 6975 // Don't warn about function templates. 6976 if (FD->getDescribedFunctionTemplate()) 6977 return false; 6978 6979 // Don't warn about function template specializations. 6980 if (FD->isFunctionTemplateSpecialization()) 6981 return false; 6982 6983 bool MissingPrototype = true; 6984 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6985 Prev; Prev = Prev->getPreviousDeclaration()) { 6986 // Ignore any declarations that occur in function or method 6987 // scope, because they aren't visible from the header. 6988 if (Prev->getDeclContext()->isFunctionOrMethod()) 6989 continue; 6990 6991 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6992 break; 6993 } 6994 6995 return MissingPrototype; 6996} 6997 6998void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6999 // Don't complain if we're in GNU89 mode and the previous definition 7000 // was an extern inline function. 7001 const FunctionDecl *Definition; 7002 if (FD->isDefined(Definition) && 7003 !canRedefineFunction(Definition, getLangOptions())) { 7004 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 7005 Definition->getStorageClass() == SC_Extern) 7006 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 7007 << FD->getDeclName() << getLangOptions().CPlusPlus; 7008 else 7009 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 7010 Diag(Definition->getLocation(), diag::note_previous_definition); 7011 } 7012} 7013 7014Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 7015 // Clear the last template instantiation error context. 7016 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 7017 7018 if (!D) 7019 return D; 7020 FunctionDecl *FD = 0; 7021 7022 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 7023 FD = FunTmpl->getTemplatedDecl(); 7024 else 7025 FD = cast<FunctionDecl>(D); 7026 7027 // Enter a new function scope 7028 PushFunctionScope(); 7029 7030 // See if this is a redefinition. 7031 if (!FD->isLateTemplateParsed()) 7032 CheckForFunctionRedefinition(FD); 7033 7034 // Builtin functions cannot be defined. 7035 if (unsigned BuiltinID = FD->getBuiltinID()) { 7036 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7037 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7038 FD->setInvalidDecl(); 7039 } 7040 } 7041 7042 // The return type of a function definition must be complete 7043 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7044 QualType ResultType = FD->getResultType(); 7045 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7046 !FD->isInvalidDecl() && 7047 RequireCompleteType(FD->getLocation(), ResultType, 7048 diag::err_func_def_incomplete_result)) 7049 FD->setInvalidDecl(); 7050 7051 // GNU warning -Wmissing-prototypes: 7052 // Warn if a global function is defined without a previous 7053 // prototype declaration. This warning is issued even if the 7054 // definition itself provides a prototype. The aim is to detect 7055 // global functions that fail to be declared in header files. 7056 if (ShouldWarnAboutMissingPrototype(FD)) 7057 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7058 7059 if (FnBodyScope) 7060 PushDeclContext(FnBodyScope, FD); 7061 7062 // Check the validity of our function parameters 7063 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7064 /*CheckParameterNames=*/true); 7065 7066 // Introduce our parameters into the function scope 7067 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7068 ParmVarDecl *Param = FD->getParamDecl(p); 7069 Param->setOwningFunction(FD); 7070 7071 // If this has an identifier, add it to the scope stack. 7072 if (Param->getIdentifier() && FnBodyScope) { 7073 CheckShadow(FnBodyScope, Param); 7074 7075 PushOnScopeChains(Param, FnBodyScope); 7076 } 7077 } 7078 7079 // Checking attributes of current function definition 7080 // dllimport attribute. 7081 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7082 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7083 // dllimport attribute cannot be directly applied to definition. 7084 // Microsoft accepts dllimport for functions defined within class scope. 7085 if (!DA->isInherited() && 7086 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7087 Diag(FD->getLocation(), 7088 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7089 << "dllimport"; 7090 FD->setInvalidDecl(); 7091 return FD; 7092 } 7093 7094 // Visual C++ appears to not think this is an issue, so only issue 7095 // a warning when Microsoft extensions are disabled. 7096 if (!LangOpts.MicrosoftExt) { 7097 // If a symbol previously declared dllimport is later defined, the 7098 // attribute is ignored in subsequent references, and a warning is 7099 // emitted. 7100 Diag(FD->getLocation(), 7101 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7102 << FD->getName() << "dllimport"; 7103 } 7104 } 7105 return FD; 7106} 7107 7108/// \brief Given the set of return statements within a function body, 7109/// compute the variables that are subject to the named return value 7110/// optimization. 7111/// 7112/// Each of the variables that is subject to the named return value 7113/// optimization will be marked as NRVO variables in the AST, and any 7114/// return statement that has a marked NRVO variable as its NRVO candidate can 7115/// use the named return value optimization. 7116/// 7117/// This function applies a very simplistic algorithm for NRVO: if every return 7118/// statement in the function has the same NRVO candidate, that candidate is 7119/// the NRVO variable. 7120/// 7121/// FIXME: Employ a smarter algorithm that accounts for multiple return 7122/// statements and the lifetimes of the NRVO candidates. We should be able to 7123/// find a maximal set of NRVO variables. 7124void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7125 ReturnStmt **Returns = Scope->Returns.data(); 7126 7127 const VarDecl *NRVOCandidate = 0; 7128 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7129 if (!Returns[I]->getNRVOCandidate()) 7130 return; 7131 7132 if (!NRVOCandidate) 7133 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7134 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7135 return; 7136 } 7137 7138 if (NRVOCandidate) 7139 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7140} 7141 7142Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7143 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7144} 7145 7146Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7147 bool IsInstantiation) { 7148 FunctionDecl *FD = 0; 7149 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7150 if (FunTmpl) 7151 FD = FunTmpl->getTemplatedDecl(); 7152 else 7153 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7154 7155 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7156 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7157 7158 if (FD) { 7159 FD->setBody(Body); 7160 if (FD->isMain()) { 7161 // C and C++ allow for main to automagically return 0. 7162 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7163 FD->setHasImplicitReturnZero(true); 7164 WP.disableCheckFallThrough(); 7165 } else if (FD->hasAttr<NakedAttr>()) { 7166 // If the function is marked 'naked', don't complain about missing return 7167 // statements. 7168 WP.disableCheckFallThrough(); 7169 } 7170 7171 // MSVC permits the use of pure specifier (=0) on function definition, 7172 // defined at class scope, warn about this non standard construct. 7173 if (getLangOptions().MicrosoftExt && FD->isPure()) 7174 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7175 7176 if (!FD->isInvalidDecl()) { 7177 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7178 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7179 FD->getResultType(), FD); 7180 7181 // If this is a constructor, we need a vtable. 7182 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7183 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7184 7185 computeNRVO(Body, getCurFunction()); 7186 } 7187 7188 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7189 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7190 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7191 MD->setBody(Body); 7192 if (Body) 7193 MD->setEndLoc(Body->getLocEnd()); 7194 if (!MD->isInvalidDecl()) { 7195 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7196 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7197 MD->getResultType(), MD); 7198 7199 if (Body) 7200 computeNRVO(Body, getCurFunction()); 7201 } 7202 if (ObjCShouldCallSuperDealloc) { 7203 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7204 ObjCShouldCallSuperDealloc = false; 7205 } 7206 if (ObjCShouldCallSuperFinalize) { 7207 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7208 ObjCShouldCallSuperFinalize = false; 7209 } 7210 } else { 7211 return 0; 7212 } 7213 7214 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7215 "ObjC methods, which should have been handled in the block above."); 7216 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7217 "ObjC methods, which should have been handled in the block above."); 7218 7219 // Verify and clean out per-function state. 7220 if (Body) { 7221 // C++ constructors that have function-try-blocks can't have return 7222 // statements in the handlers of that block. (C++ [except.handle]p14) 7223 // Verify this. 7224 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7225 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7226 7227 // Verify that gotos and switch cases don't jump into scopes illegally. 7228 if (getCurFunction()->NeedsScopeChecking() && 7229 !dcl->isInvalidDecl() && 7230 !hasAnyUnrecoverableErrorsInThisFunction()) 7231 DiagnoseInvalidJumps(Body); 7232 7233 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7234 if (!Destructor->getParent()->isDependentType()) 7235 CheckDestructor(Destructor); 7236 7237 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7238 Destructor->getParent()); 7239 } 7240 7241 // If any errors have occurred, clear out any temporaries that may have 7242 // been leftover. This ensures that these temporaries won't be picked up for 7243 // deletion in some later function. 7244 if (PP.getDiagnostics().hasErrorOccurred() || 7245 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7246 DiscardCleanupsInEvaluationContext(); 7247 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7248 // Since the body is valid, issue any analysis-based warnings that are 7249 // enabled. 7250 ActivePolicy = &WP; 7251 } 7252 7253 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7254 !CheckConstexprFunctionBody(FD, Body)) 7255 FD->setInvalidDecl(); 7256 7257 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7258 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7259 } 7260 7261 if (!IsInstantiation) 7262 PopDeclContext(); 7263 7264 PopFunctionScopeInfo(ActivePolicy, dcl); 7265 7266 // If any errors have occurred, clear out any temporaries that may have 7267 // been leftover. This ensures that these temporaries won't be picked up for 7268 // deletion in some later function. 7269 if (getDiagnostics().hasErrorOccurred()) { 7270 DiscardCleanupsInEvaluationContext(); 7271 } 7272 7273 return dcl; 7274} 7275 7276 7277/// When we finish delayed parsing of an attribute, we must attach it to the 7278/// relevant Decl. 7279void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7280 ParsedAttributes &Attrs) { 7281 ProcessDeclAttributeList(S, D, Attrs.getList()); 7282} 7283 7284 7285/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7286/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7287NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7288 IdentifierInfo &II, Scope *S) { 7289 // Before we produce a declaration for an implicitly defined 7290 // function, see whether there was a locally-scoped declaration of 7291 // this name as a function or variable. If so, use that 7292 // (non-visible) declaration, and complain about it. 7293 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7294 = findLocallyScopedExternalDecl(&II); 7295 if (Pos != LocallyScopedExternalDecls.end()) { 7296 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7297 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7298 return Pos->second; 7299 } 7300 7301 // Extension in C99. Legal in C90, but warn about it. 7302 unsigned diag_id; 7303 if (II.getName().startswith("__builtin_")) 7304 diag_id = diag::warn_builtin_unknown; 7305 else if (getLangOptions().C99) 7306 diag_id = diag::ext_implicit_function_decl; 7307 else 7308 diag_id = diag::warn_implicit_function_decl; 7309 Diag(Loc, diag_id) << &II; 7310 7311 // Because typo correction is expensive, only do it if the implicit 7312 // function declaration is going to be treated as an error. 7313 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7314 TypoCorrection Corrected; 7315 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7316 LookupOrdinaryName, S, 0))) { 7317 NamedDecl *Decl = Corrected.getCorrectionDecl(); 7318 if (FunctionDecl *Func = dyn_cast_or_null<FunctionDecl>(Decl)) { 7319 std::string CorrectedStr = Corrected.getAsString(getLangOptions()); 7320 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOptions()); 7321 7322 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7323 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7324 7325 if (Func->getLocation().isValid() 7326 && !II.getName().startswith("__builtin_")) 7327 Diag(Func->getLocation(), diag::note_previous_decl) 7328 << CorrectedQuotedStr; 7329 } 7330 } 7331 } 7332 7333 // Set a Declarator for the implicit definition: int foo(); 7334 const char *Dummy; 7335 AttributeFactory attrFactory; 7336 DeclSpec DS(attrFactory); 7337 unsigned DiagID; 7338 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7339 (void)Error; // Silence warning. 7340 assert(!Error && "Error setting up implicit decl!"); 7341 Declarator D(DS, Declarator::BlockContext); 7342 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7343 0, 0, true, SourceLocation(), 7344 SourceLocation(), SourceLocation(), 7345 SourceLocation(), 7346 EST_None, SourceLocation(), 7347 0, 0, 0, 0, Loc, Loc, D), 7348 DS.getAttributes(), 7349 SourceLocation()); 7350 D.SetIdentifier(&II, Loc); 7351 7352 // Insert this function into translation-unit scope. 7353 7354 DeclContext *PrevDC = CurContext; 7355 CurContext = Context.getTranslationUnitDecl(); 7356 7357 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7358 FD->setImplicit(); 7359 7360 CurContext = PrevDC; 7361 7362 AddKnownFunctionAttributes(FD); 7363 7364 return FD; 7365} 7366 7367/// \brief Adds any function attributes that we know a priori based on 7368/// the declaration of this function. 7369/// 7370/// These attributes can apply both to implicitly-declared builtins 7371/// (like __builtin___printf_chk) or to library-declared functions 7372/// like NSLog or printf. 7373/// 7374/// We need to check for duplicate attributes both here and where user-written 7375/// attributes are applied to declarations. 7376void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7377 if (FD->isInvalidDecl()) 7378 return; 7379 7380 // If this is a built-in function, map its builtin attributes to 7381 // actual attributes. 7382 if (unsigned BuiltinID = FD->getBuiltinID()) { 7383 // Handle printf-formatting attributes. 7384 unsigned FormatIdx; 7385 bool HasVAListArg; 7386 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7387 if (!FD->getAttr<FormatAttr>()) 7388 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7389 "printf", FormatIdx+1, 7390 HasVAListArg ? 0 : FormatIdx+2)); 7391 } 7392 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7393 HasVAListArg)) { 7394 if (!FD->getAttr<FormatAttr>()) 7395 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7396 "scanf", FormatIdx+1, 7397 HasVAListArg ? 0 : FormatIdx+2)); 7398 } 7399 7400 // Mark const if we don't care about errno and that is the only 7401 // thing preventing the function from being const. This allows 7402 // IRgen to use LLVM intrinsics for such functions. 7403 if (!getLangOptions().MathErrno && 7404 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7405 if (!FD->getAttr<ConstAttr>()) 7406 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7407 } 7408 7409 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7410 !FD->getAttr<ReturnsTwiceAttr>()) 7411 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7412 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7413 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7414 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7415 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7416 } 7417 7418 IdentifierInfo *Name = FD->getIdentifier(); 7419 if (!Name) 7420 return; 7421 if ((!getLangOptions().CPlusPlus && 7422 FD->getDeclContext()->isTranslationUnit()) || 7423 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7424 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7425 LinkageSpecDecl::lang_c)) { 7426 // Okay: this could be a libc/libm/Objective-C function we know 7427 // about. 7428 } else 7429 return; 7430 7431 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7432 // FIXME: NSLog and NSLogv should be target specific 7433 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7434 // FIXME: We known better than our headers. 7435 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7436 } else 7437 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7438 "printf", 1, 7439 Name->isStr("NSLogv") ? 0 : 2)); 7440 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7441 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7442 // target-specific builtins, perhaps? 7443 if (!FD->getAttr<FormatAttr>()) 7444 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7445 "printf", 2, 7446 Name->isStr("vasprintf") ? 0 : 3)); 7447 } 7448} 7449 7450TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7451 TypeSourceInfo *TInfo) { 7452 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7453 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7454 7455 if (!TInfo) { 7456 assert(D.isInvalidType() && "no declarator info for valid type"); 7457 TInfo = Context.getTrivialTypeSourceInfo(T); 7458 } 7459 7460 // Scope manipulation handled by caller. 7461 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7462 D.getSourceRange().getBegin(), 7463 D.getIdentifierLoc(), 7464 D.getIdentifier(), 7465 TInfo); 7466 7467 // Bail out immediately if we have an invalid declaration. 7468 if (D.isInvalidType()) { 7469 NewTD->setInvalidDecl(); 7470 return NewTD; 7471 } 7472 7473 if (D.getDeclSpec().isModulePrivateSpecified()) { 7474 if (CurContext->isFunctionOrMethod()) 7475 Diag(NewTD->getLocation(), diag::err_module_private_local) 7476 << 2 << NewTD->getDeclName() 7477 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7478 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7479 else 7480 NewTD->setModulePrivate(); 7481 } 7482 7483 // C++ [dcl.typedef]p8: 7484 // If the typedef declaration defines an unnamed class (or 7485 // enum), the first typedef-name declared by the declaration 7486 // to be that class type (or enum type) is used to denote the 7487 // class type (or enum type) for linkage purposes only. 7488 // We need to check whether the type was declared in the declaration. 7489 switch (D.getDeclSpec().getTypeSpecType()) { 7490 case TST_enum: 7491 case TST_struct: 7492 case TST_union: 7493 case TST_class: { 7494 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7495 7496 // Do nothing if the tag is not anonymous or already has an 7497 // associated typedef (from an earlier typedef in this decl group). 7498 if (tagFromDeclSpec->getIdentifier()) break; 7499 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7500 7501 // A well-formed anonymous tag must always be a TUK_Definition. 7502 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7503 7504 // The type must match the tag exactly; no qualifiers allowed. 7505 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7506 break; 7507 7508 // Otherwise, set this is the anon-decl typedef for the tag. 7509 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7510 break; 7511 } 7512 7513 default: 7514 break; 7515 } 7516 7517 return NewTD; 7518} 7519 7520 7521/// \brief Determine whether a tag with a given kind is acceptable 7522/// as a redeclaration of the given tag declaration. 7523/// 7524/// \returns true if the new tag kind is acceptable, false otherwise. 7525bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7526 TagTypeKind NewTag, bool isDefinition, 7527 SourceLocation NewTagLoc, 7528 const IdentifierInfo &Name) { 7529 // C++ [dcl.type.elab]p3: 7530 // The class-key or enum keyword present in the 7531 // elaborated-type-specifier shall agree in kind with the 7532 // declaration to which the name in the elaborated-type-specifier 7533 // refers. This rule also applies to the form of 7534 // elaborated-type-specifier that declares a class-name or 7535 // friend class since it can be construed as referring to the 7536 // definition of the class. Thus, in any 7537 // elaborated-type-specifier, the enum keyword shall be used to 7538 // refer to an enumeration (7.2), the union class-key shall be 7539 // used to refer to a union (clause 9), and either the class or 7540 // struct class-key shall be used to refer to a class (clause 9) 7541 // declared using the class or struct class-key. 7542 TagTypeKind OldTag = Previous->getTagKind(); 7543 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7544 if (OldTag == NewTag) 7545 return true; 7546 7547 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7548 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7549 // Warn about the struct/class tag mismatch. 7550 bool isTemplate = false; 7551 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7552 isTemplate = Record->getDescribedClassTemplate(); 7553 7554 if (!ActiveTemplateInstantiations.empty()) { 7555 // In a template instantiation, do not offer fix-its for tag mismatches 7556 // since they usually mess up the template instead of fixing the problem. 7557 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7558 << (NewTag == TTK_Class) << isTemplate << &Name; 7559 return true; 7560 } 7561 7562 if (isDefinition) { 7563 // On definitions, check previous tags and issue a fix-it for each 7564 // one that doesn't match the current tag. 7565 if (Previous->getDefinition()) { 7566 // Don't suggest fix-its for redefinitions. 7567 return true; 7568 } 7569 7570 bool previousMismatch = false; 7571 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7572 E(Previous->redecls_end()); I != E; ++I) { 7573 if (I->getTagKind() != NewTag) { 7574 if (!previousMismatch) { 7575 previousMismatch = true; 7576 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7577 << (NewTag == TTK_Class) << isTemplate << &Name; 7578 } 7579 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7580 << (NewTag == TTK_Class) 7581 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7582 NewTag == TTK_Class? 7583 "class" : "struct"); 7584 } 7585 } 7586 return true; 7587 } 7588 7589 // Check for a previous definition. If current tag and definition 7590 // are same type, do nothing. If no definition, but disagree with 7591 // with previous tag type, give a warning, but no fix-it. 7592 const TagDecl *Redecl = Previous->getDefinition() ? 7593 Previous->getDefinition() : Previous; 7594 if (Redecl->getTagKind() == NewTag) { 7595 return true; 7596 } 7597 7598 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7599 << (NewTag == TTK_Class) 7600 << isTemplate << &Name; 7601 Diag(Redecl->getLocation(), diag::note_previous_use); 7602 7603 // If there is a previous defintion, suggest a fix-it. 7604 if (Previous->getDefinition()) { 7605 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7606 << (Redecl->getTagKind() == TTK_Class) 7607 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7608 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7609 } 7610 7611 return true; 7612 } 7613 return false; 7614} 7615 7616/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7617/// former case, Name will be non-null. In the later case, Name will be null. 7618/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7619/// reference/declaration/definition of a tag. 7620Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7621 SourceLocation KWLoc, CXXScopeSpec &SS, 7622 IdentifierInfo *Name, SourceLocation NameLoc, 7623 AttributeList *Attr, AccessSpecifier AS, 7624 SourceLocation ModulePrivateLoc, 7625 MultiTemplateParamsArg TemplateParameterLists, 7626 bool &OwnedDecl, bool &IsDependent, 7627 SourceLocation ScopedEnumKWLoc, 7628 bool ScopedEnumUsesClassTag, 7629 TypeResult UnderlyingType) { 7630 // If this is not a definition, it must have a name. 7631 assert((Name != 0 || TUK == TUK_Definition) && 7632 "Nameless record must be a definition!"); 7633 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7634 7635 OwnedDecl = false; 7636 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7637 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 7638 7639 // FIXME: Check explicit specializations more carefully. 7640 bool isExplicitSpecialization = false; 7641 bool Invalid = false; 7642 7643 // We only need to do this matching if we have template parameters 7644 // or a scope specifier, which also conveniently avoids this work 7645 // for non-C++ cases. 7646 if (TemplateParameterLists.size() > 0 || 7647 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7648 if (TemplateParameterList *TemplateParams 7649 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7650 TemplateParameterLists.get(), 7651 TemplateParameterLists.size(), 7652 TUK == TUK_Friend, 7653 isExplicitSpecialization, 7654 Invalid)) { 7655 if (TemplateParams->size() > 0) { 7656 // This is a declaration or definition of a class template (which may 7657 // be a member of another template). 7658 7659 if (Invalid) 7660 return 0; 7661 7662 OwnedDecl = false; 7663 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7664 SS, Name, NameLoc, Attr, 7665 TemplateParams, AS, 7666 ModulePrivateLoc, 7667 TemplateParameterLists.size() - 1, 7668 (TemplateParameterList**) TemplateParameterLists.release()); 7669 return Result.get(); 7670 } else { 7671 // The "template<>" header is extraneous. 7672 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7673 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7674 isExplicitSpecialization = true; 7675 } 7676 } 7677 } 7678 7679 // Figure out the underlying type if this a enum declaration. We need to do 7680 // this early, because it's needed to detect if this is an incompatible 7681 // redeclaration. 7682 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7683 7684 if (Kind == TTK_Enum) { 7685 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7686 // No underlying type explicitly specified, or we failed to parse the 7687 // type, default to int. 7688 EnumUnderlying = Context.IntTy.getTypePtr(); 7689 else if (UnderlyingType.get()) { 7690 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7691 // integral type; any cv-qualification is ignored. 7692 TypeSourceInfo *TI = 0; 7693 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7694 EnumUnderlying = TI; 7695 7696 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7697 7698 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7699 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7700 << T; 7701 // Recover by falling back to int. 7702 EnumUnderlying = Context.IntTy.getTypePtr(); 7703 } 7704 7705 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7706 UPPC_FixedUnderlyingType)) 7707 EnumUnderlying = Context.IntTy.getTypePtr(); 7708 7709 } else if (getLangOptions().MicrosoftExt) 7710 // Microsoft enums are always of int type. 7711 EnumUnderlying = Context.IntTy.getTypePtr(); 7712 } 7713 7714 DeclContext *SearchDC = CurContext; 7715 DeclContext *DC = CurContext; 7716 bool isStdBadAlloc = false; 7717 7718 RedeclarationKind Redecl = ForRedeclaration; 7719 if (TUK == TUK_Friend || TUK == TUK_Reference) 7720 Redecl = NotForRedeclaration; 7721 7722 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7723 7724 if (Name && SS.isNotEmpty()) { 7725 // We have a nested-name tag ('struct foo::bar'). 7726 7727 // Check for invalid 'foo::'. 7728 if (SS.isInvalid()) { 7729 Name = 0; 7730 goto CreateNewDecl; 7731 } 7732 7733 // If this is a friend or a reference to a class in a dependent 7734 // context, don't try to make a decl for it. 7735 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7736 DC = computeDeclContext(SS, false); 7737 if (!DC) { 7738 IsDependent = true; 7739 return 0; 7740 } 7741 } else { 7742 DC = computeDeclContext(SS, true); 7743 if (!DC) { 7744 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7745 << SS.getRange(); 7746 return 0; 7747 } 7748 } 7749 7750 if (RequireCompleteDeclContext(SS, DC)) 7751 return 0; 7752 7753 SearchDC = DC; 7754 // Look-up name inside 'foo::'. 7755 LookupQualifiedName(Previous, DC); 7756 7757 if (Previous.isAmbiguous()) 7758 return 0; 7759 7760 if (Previous.empty()) { 7761 // Name lookup did not find anything. However, if the 7762 // nested-name-specifier refers to the current instantiation, 7763 // and that current instantiation has any dependent base 7764 // classes, we might find something at instantiation time: treat 7765 // this as a dependent elaborated-type-specifier. 7766 // But this only makes any sense for reference-like lookups. 7767 if (Previous.wasNotFoundInCurrentInstantiation() && 7768 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7769 IsDependent = true; 7770 return 0; 7771 } 7772 7773 // A tag 'foo::bar' must already exist. 7774 Diag(NameLoc, diag::err_not_tag_in_scope) 7775 << Kind << Name << DC << SS.getRange(); 7776 Name = 0; 7777 Invalid = true; 7778 goto CreateNewDecl; 7779 } 7780 } else if (Name) { 7781 // If this is a named struct, check to see if there was a previous forward 7782 // declaration or definition. 7783 // FIXME: We're looking into outer scopes here, even when we 7784 // shouldn't be. Doing so can result in ambiguities that we 7785 // shouldn't be diagnosing. 7786 LookupName(Previous, S); 7787 7788 if (Previous.isAmbiguous() && 7789 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7790 LookupResult::Filter F = Previous.makeFilter(); 7791 while (F.hasNext()) { 7792 NamedDecl *ND = F.next(); 7793 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7794 F.erase(); 7795 } 7796 F.done(); 7797 } 7798 7799 // Note: there used to be some attempt at recovery here. 7800 if (Previous.isAmbiguous()) 7801 return 0; 7802 7803 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7804 // FIXME: This makes sure that we ignore the contexts associated 7805 // with C structs, unions, and enums when looking for a matching 7806 // tag declaration or definition. See the similar lookup tweak 7807 // in Sema::LookupName; is there a better way to deal with this? 7808 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7809 SearchDC = SearchDC->getParent(); 7810 } 7811 } else if (S->isFunctionPrototypeScope()) { 7812 // If this is an enum declaration in function prototype scope, set its 7813 // initial context to the translation unit. 7814 SearchDC = Context.getTranslationUnitDecl(); 7815 } 7816 7817 if (Previous.isSingleResult() && 7818 Previous.getFoundDecl()->isTemplateParameter()) { 7819 // Maybe we will complain about the shadowed template parameter. 7820 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7821 // Just pretend that we didn't see the previous declaration. 7822 Previous.clear(); 7823 } 7824 7825 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7826 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7827 // This is a declaration of or a reference to "std::bad_alloc". 7828 isStdBadAlloc = true; 7829 7830 if (Previous.empty() && StdBadAlloc) { 7831 // std::bad_alloc has been implicitly declared (but made invisible to 7832 // name lookup). Fill in this implicit declaration as the previous 7833 // declaration, so that the declarations get chained appropriately. 7834 Previous.addDecl(getStdBadAlloc()); 7835 } 7836 } 7837 7838 // If we didn't find a previous declaration, and this is a reference 7839 // (or friend reference), move to the correct scope. In C++, we 7840 // also need to do a redeclaration lookup there, just in case 7841 // there's a shadow friend decl. 7842 if (Name && Previous.empty() && 7843 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7844 if (Invalid) goto CreateNewDecl; 7845 assert(SS.isEmpty()); 7846 7847 if (TUK == TUK_Reference) { 7848 // C++ [basic.scope.pdecl]p5: 7849 // -- for an elaborated-type-specifier of the form 7850 // 7851 // class-key identifier 7852 // 7853 // if the elaborated-type-specifier is used in the 7854 // decl-specifier-seq or parameter-declaration-clause of a 7855 // function defined in namespace scope, the identifier is 7856 // declared as a class-name in the namespace that contains 7857 // the declaration; otherwise, except as a friend 7858 // declaration, the identifier is declared in the smallest 7859 // non-class, non-function-prototype scope that contains the 7860 // declaration. 7861 // 7862 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7863 // C structs and unions. 7864 // 7865 // It is an error in C++ to declare (rather than define) an enum 7866 // type, including via an elaborated type specifier. We'll 7867 // diagnose that later; for now, declare the enum in the same 7868 // scope as we would have picked for any other tag type. 7869 // 7870 // GNU C also supports this behavior as part of its incomplete 7871 // enum types extension, while GNU C++ does not. 7872 // 7873 // Find the context where we'll be declaring the tag. 7874 // FIXME: We would like to maintain the current DeclContext as the 7875 // lexical context, 7876 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7877 SearchDC = SearchDC->getParent(); 7878 7879 // Find the scope where we'll be declaring the tag. 7880 while (S->isClassScope() || 7881 (getLangOptions().CPlusPlus && 7882 S->isFunctionPrototypeScope()) || 7883 ((S->getFlags() & Scope::DeclScope) == 0) || 7884 (S->getEntity() && 7885 ((DeclContext *)S->getEntity())->isTransparentContext())) 7886 S = S->getParent(); 7887 } else { 7888 assert(TUK == TUK_Friend); 7889 // C++ [namespace.memdef]p3: 7890 // If a friend declaration in a non-local class first declares a 7891 // class or function, the friend class or function is a member of 7892 // the innermost enclosing namespace. 7893 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7894 } 7895 7896 // In C++, we need to do a redeclaration lookup to properly 7897 // diagnose some problems. 7898 if (getLangOptions().CPlusPlus) { 7899 Previous.setRedeclarationKind(ForRedeclaration); 7900 LookupQualifiedName(Previous, SearchDC); 7901 } 7902 } 7903 7904 if (!Previous.empty()) { 7905 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7906 7907 // It's okay to have a tag decl in the same scope as a typedef 7908 // which hides a tag decl in the same scope. Finding this 7909 // insanity with a redeclaration lookup can only actually happen 7910 // in C++. 7911 // 7912 // This is also okay for elaborated-type-specifiers, which is 7913 // technically forbidden by the current standard but which is 7914 // okay according to the likely resolution of an open issue; 7915 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7916 if (getLangOptions().CPlusPlus) { 7917 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7918 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7919 TagDecl *Tag = TT->getDecl(); 7920 if (Tag->getDeclName() == Name && 7921 Tag->getDeclContext()->getRedeclContext() 7922 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7923 PrevDecl = Tag; 7924 Previous.clear(); 7925 Previous.addDecl(Tag); 7926 Previous.resolveKind(); 7927 } 7928 } 7929 } 7930 } 7931 7932 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7933 // If this is a use of a previous tag, or if the tag is already declared 7934 // in the same scope (so that the definition/declaration completes or 7935 // rementions the tag), reuse the decl. 7936 if (TUK == TUK_Reference || TUK == TUK_Friend || 7937 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7938 // Make sure that this wasn't declared as an enum and now used as a 7939 // struct or something similar. 7940 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7941 TUK == TUK_Definition, KWLoc, 7942 *Name)) { 7943 bool SafeToContinue 7944 = (PrevTagDecl->getTagKind() != TTK_Enum && 7945 Kind != TTK_Enum); 7946 if (SafeToContinue) 7947 Diag(KWLoc, diag::err_use_with_wrong_tag) 7948 << Name 7949 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7950 PrevTagDecl->getKindName()); 7951 else 7952 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7953 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7954 7955 if (SafeToContinue) 7956 Kind = PrevTagDecl->getTagKind(); 7957 else { 7958 // Recover by making this an anonymous redefinition. 7959 Name = 0; 7960 Previous.clear(); 7961 Invalid = true; 7962 } 7963 } 7964 7965 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7966 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7967 7968 // If this is an elaborated-type-specifier for a scoped enumeration, 7969 // the 'class' keyword is not necessary and not permitted. 7970 if (TUK == TUK_Reference || TUK == TUK_Friend) { 7971 if (ScopedEnum) 7972 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 7973 << PrevEnum->isScoped() 7974 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 7975 return PrevTagDecl; 7976 } 7977 7978 // All conflicts with previous declarations are recovered by 7979 // returning the previous declaration. 7980 if (ScopedEnum != PrevEnum->isScoped()) { 7981 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7982 << PrevEnum->isScoped(); 7983 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7984 return PrevTagDecl; 7985 } 7986 else if (EnumUnderlying && PrevEnum->isFixed()) { 7987 QualType T; 7988 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7989 T = TI->getType(); 7990 else 7991 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7992 7993 if (!Context.hasSameUnqualifiedType(T, 7994 PrevEnum->getIntegerType())) { 7995 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7996 diag::err_enum_redeclare_type_mismatch) 7997 << T 7998 << PrevEnum->getIntegerType(); 7999 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8000 return PrevTagDecl; 8001 } 8002 } 8003 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 8004 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 8005 << PrevEnum->isFixed(); 8006 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8007 return PrevTagDecl; 8008 } 8009 } 8010 8011 if (!Invalid) { 8012 // If this is a use, just return the declaration we found. 8013 8014 // FIXME: In the future, return a variant or some other clue 8015 // for the consumer of this Decl to know it doesn't own it. 8016 // For our current ASTs this shouldn't be a problem, but will 8017 // need to be changed with DeclGroups. 8018 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 8019 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 8020 return PrevTagDecl; 8021 8022 // Diagnose attempts to redefine a tag. 8023 if (TUK == TUK_Definition) { 8024 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 8025 // If we're defining a specialization and the previous definition 8026 // is from an implicit instantiation, don't emit an error 8027 // here; we'll catch this in the general case below. 8028 if (!isExplicitSpecialization || 8029 !isa<CXXRecordDecl>(Def) || 8030 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 8031 == TSK_ExplicitSpecialization) { 8032 Diag(NameLoc, diag::err_redefinition) << Name; 8033 Diag(Def->getLocation(), diag::note_previous_definition); 8034 // If this is a redefinition, recover by making this 8035 // struct be anonymous, which will make any later 8036 // references get the previous definition. 8037 Name = 0; 8038 Previous.clear(); 8039 Invalid = true; 8040 } 8041 } else { 8042 // If the type is currently being defined, complain 8043 // about a nested redefinition. 8044 const TagType *Tag 8045 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8046 if (Tag->isBeingDefined()) { 8047 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8048 Diag(PrevTagDecl->getLocation(), 8049 diag::note_previous_definition); 8050 Name = 0; 8051 Previous.clear(); 8052 Invalid = true; 8053 } 8054 } 8055 8056 // Okay, this is definition of a previously declared or referenced 8057 // tag PrevDecl. We're going to create a new Decl for it. 8058 } 8059 } 8060 // If we get here we have (another) forward declaration or we 8061 // have a definition. Just create a new decl. 8062 8063 } else { 8064 // If we get here, this is a definition of a new tag type in a nested 8065 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8066 // new decl/type. We set PrevDecl to NULL so that the entities 8067 // have distinct types. 8068 Previous.clear(); 8069 } 8070 // If we get here, we're going to create a new Decl. If PrevDecl 8071 // is non-NULL, it's a definition of the tag declared by 8072 // PrevDecl. If it's NULL, we have a new definition. 8073 8074 8075 // Otherwise, PrevDecl is not a tag, but was found with tag 8076 // lookup. This is only actually possible in C++, where a few 8077 // things like templates still live in the tag namespace. 8078 } else { 8079 // Use a better diagnostic if an elaborated-type-specifier 8080 // found the wrong kind of type on the first 8081 // (non-redeclaration) lookup. 8082 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8083 !Previous.isForRedeclaration()) { 8084 unsigned Kind = 0; 8085 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8086 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8087 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8088 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8089 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8090 Invalid = true; 8091 8092 // Otherwise, only diagnose if the declaration is in scope. 8093 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8094 isExplicitSpecialization)) { 8095 // do nothing 8096 8097 // Diagnose implicit declarations introduced by elaborated types. 8098 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8099 unsigned Kind = 0; 8100 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8101 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8102 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8103 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8104 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8105 Invalid = true; 8106 8107 // Otherwise it's a declaration. Call out a particularly common 8108 // case here. 8109 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8110 unsigned Kind = 0; 8111 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8112 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8113 << Name << Kind << TND->getUnderlyingType(); 8114 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8115 Invalid = true; 8116 8117 // Otherwise, diagnose. 8118 } else { 8119 // The tag name clashes with something else in the target scope, 8120 // issue an error and recover by making this tag be anonymous. 8121 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8122 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8123 Name = 0; 8124 Invalid = true; 8125 } 8126 8127 // The existing declaration isn't relevant to us; we're in a 8128 // new scope, so clear out the previous declaration. 8129 Previous.clear(); 8130 } 8131 } 8132 8133CreateNewDecl: 8134 8135 TagDecl *PrevDecl = 0; 8136 if (Previous.isSingleResult()) 8137 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8138 8139 // If there is an identifier, use the location of the identifier as the 8140 // location of the decl, otherwise use the location of the struct/union 8141 // keyword. 8142 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8143 8144 // Otherwise, create a new declaration. If there is a previous 8145 // declaration of the same entity, the two will be linked via 8146 // PrevDecl. 8147 TagDecl *New; 8148 8149 bool IsForwardReference = false; 8150 if (Kind == TTK_Enum) { 8151 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8152 // enum X { A, B, C } D; D should chain to X. 8153 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8154 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8155 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8156 // If this is an undefined enum, warn. 8157 if (TUK != TUK_Definition && !Invalid) { 8158 TagDecl *Def; 8159 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8160 // C++0x: 7.2p2: opaque-enum-declaration. 8161 // Conflicts are diagnosed above. Do nothing. 8162 } 8163 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8164 Diag(Loc, diag::ext_forward_ref_enum_def) 8165 << New; 8166 Diag(Def->getLocation(), diag::note_previous_definition); 8167 } else { 8168 unsigned DiagID = diag::ext_forward_ref_enum; 8169 if (getLangOptions().MicrosoftExt) 8170 DiagID = diag::ext_ms_forward_ref_enum; 8171 else if (getLangOptions().CPlusPlus) 8172 DiagID = diag::err_forward_ref_enum; 8173 Diag(Loc, DiagID); 8174 8175 // If this is a forward-declared reference to an enumeration, make a 8176 // note of it; we won't actually be introducing the declaration into 8177 // the declaration context. 8178 if (TUK == TUK_Reference) 8179 IsForwardReference = true; 8180 } 8181 } 8182 8183 if (EnumUnderlying) { 8184 EnumDecl *ED = cast<EnumDecl>(New); 8185 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8186 ED->setIntegerTypeSourceInfo(TI); 8187 else 8188 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8189 ED->setPromotionType(ED->getIntegerType()); 8190 } 8191 8192 } else { 8193 // struct/union/class 8194 8195 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8196 // struct X { int A; } D; D should chain to X. 8197 if (getLangOptions().CPlusPlus) { 8198 // FIXME: Look for a way to use RecordDecl for simple structs. 8199 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8200 cast_or_null<CXXRecordDecl>(PrevDecl)); 8201 8202 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8203 StdBadAlloc = cast<CXXRecordDecl>(New); 8204 } else 8205 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8206 cast_or_null<RecordDecl>(PrevDecl)); 8207 } 8208 8209 // Maybe add qualifier info. 8210 if (SS.isNotEmpty()) { 8211 if (SS.isSet()) { 8212 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8213 if (TemplateParameterLists.size() > 0) { 8214 New->setTemplateParameterListsInfo(Context, 8215 TemplateParameterLists.size(), 8216 (TemplateParameterList**) TemplateParameterLists.release()); 8217 } 8218 } 8219 else 8220 Invalid = true; 8221 } 8222 8223 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8224 // Add alignment attributes if necessary; these attributes are checked when 8225 // the ASTContext lays out the structure. 8226 // 8227 // It is important for implementing the correct semantics that this 8228 // happen here (in act on tag decl). The #pragma pack stack is 8229 // maintained as a result of parser callbacks which can occur at 8230 // many points during the parsing of a struct declaration (because 8231 // the #pragma tokens are effectively skipped over during the 8232 // parsing of the struct). 8233 AddAlignmentAttributesForRecord(RD); 8234 8235 AddMsStructLayoutForRecord(RD); 8236 } 8237 8238 if (ModulePrivateLoc.isValid()) { 8239 if (isExplicitSpecialization) 8240 Diag(New->getLocation(), diag::err_module_private_specialization) 8241 << 2 8242 << FixItHint::CreateRemoval(ModulePrivateLoc); 8243 // __module_private__ does not apply to local classes. However, we only 8244 // diagnose this as an error when the declaration specifiers are 8245 // freestanding. Here, we just ignore the __module_private__. 8246 else if (!SearchDC->isFunctionOrMethod()) 8247 New->setModulePrivate(); 8248 } 8249 8250 // If this is a specialization of a member class (of a class template), 8251 // check the specialization. 8252 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8253 Invalid = true; 8254 8255 if (Invalid) 8256 New->setInvalidDecl(); 8257 8258 if (Attr) 8259 ProcessDeclAttributeList(S, New, Attr); 8260 8261 // If we're declaring or defining a tag in function prototype scope 8262 // in C, note that this type can only be used within the function. 8263 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8264 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8265 8266 // Set the lexical context. If the tag has a C++ scope specifier, the 8267 // lexical context will be different from the semantic context. 8268 New->setLexicalDeclContext(CurContext); 8269 8270 // Mark this as a friend decl if applicable. 8271 // In Microsoft mode, a friend declaration also acts as a forward 8272 // declaration so we always pass true to setObjectOfFriendDecl to make 8273 // the tag name visible. 8274 if (TUK == TUK_Friend) 8275 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8276 getLangOptions().MicrosoftExt); 8277 8278 // Set the access specifier. 8279 if (!Invalid && SearchDC->isRecord()) 8280 SetMemberAccessSpecifier(New, PrevDecl, AS); 8281 8282 if (TUK == TUK_Definition) 8283 New->startDefinition(); 8284 8285 // If this has an identifier, add it to the scope stack. 8286 if (TUK == TUK_Friend) { 8287 // We might be replacing an existing declaration in the lookup tables; 8288 // if so, borrow its access specifier. 8289 if (PrevDecl) 8290 New->setAccess(PrevDecl->getAccess()); 8291 8292 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8293 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8294 if (Name) // can be null along some error paths 8295 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8296 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8297 } else if (Name) { 8298 S = getNonFieldDeclScope(S); 8299 PushOnScopeChains(New, S, !IsForwardReference); 8300 if (IsForwardReference) 8301 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8302 8303 } else { 8304 CurContext->addDecl(New); 8305 } 8306 8307 // If this is the C FILE type, notify the AST context. 8308 if (IdentifierInfo *II = New->getIdentifier()) 8309 if (!New->isInvalidDecl() && 8310 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8311 II->isStr("FILE")) 8312 Context.setFILEDecl(New); 8313 8314 OwnedDecl = true; 8315 return New; 8316} 8317 8318void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8319 AdjustDeclIfTemplate(TagD); 8320 TagDecl *Tag = cast<TagDecl>(TagD); 8321 8322 // Enter the tag context. 8323 PushDeclContext(S, Tag); 8324} 8325 8326Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8327 assert(isa<ObjCContainerDecl>(IDecl) && 8328 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8329 DeclContext *OCD = cast<DeclContext>(IDecl); 8330 assert(getContainingDC(OCD) == CurContext && 8331 "The next DeclContext should be lexically contained in the current one."); 8332 CurContext = OCD; 8333 return IDecl; 8334} 8335 8336void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8337 SourceLocation FinalLoc, 8338 SourceLocation LBraceLoc) { 8339 AdjustDeclIfTemplate(TagD); 8340 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8341 8342 FieldCollector->StartClass(); 8343 8344 if (!Record->getIdentifier()) 8345 return; 8346 8347 if (FinalLoc.isValid()) 8348 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8349 8350 // C++ [class]p2: 8351 // [...] The class-name is also inserted into the scope of the 8352 // class itself; this is known as the injected-class-name. For 8353 // purposes of access checking, the injected-class-name is treated 8354 // as if it were a public member name. 8355 CXXRecordDecl *InjectedClassName 8356 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8357 Record->getLocStart(), Record->getLocation(), 8358 Record->getIdentifier(), 8359 /*PrevDecl=*/0, 8360 /*DelayTypeCreation=*/true); 8361 Context.getTypeDeclType(InjectedClassName, Record); 8362 InjectedClassName->setImplicit(); 8363 InjectedClassName->setAccess(AS_public); 8364 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8365 InjectedClassName->setDescribedClassTemplate(Template); 8366 PushOnScopeChains(InjectedClassName, S); 8367 assert(InjectedClassName->isInjectedClassName() && 8368 "Broken injected-class-name"); 8369} 8370 8371void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8372 SourceLocation RBraceLoc) { 8373 AdjustDeclIfTemplate(TagD); 8374 TagDecl *Tag = cast<TagDecl>(TagD); 8375 Tag->setRBraceLoc(RBraceLoc); 8376 8377 if (isa<CXXRecordDecl>(Tag)) 8378 FieldCollector->FinishClass(); 8379 8380 // Exit this scope of this tag's definition. 8381 PopDeclContext(); 8382 8383 // Notify the consumer that we've defined a tag. 8384 Consumer.HandleTagDeclDefinition(Tag); 8385} 8386 8387void Sema::ActOnObjCContainerFinishDefinition() { 8388 // Exit this scope of this interface definition. 8389 PopDeclContext(); 8390} 8391 8392void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8393 assert(DC == CurContext && "Mismatch of container contexts"); 8394 OriginalLexicalContext = DC; 8395 ActOnObjCContainerFinishDefinition(); 8396} 8397 8398void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8399 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8400 OriginalLexicalContext = 0; 8401} 8402 8403void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8404 AdjustDeclIfTemplate(TagD); 8405 TagDecl *Tag = cast<TagDecl>(TagD); 8406 Tag->setInvalidDecl(); 8407 8408 // We're undoing ActOnTagStartDefinition here, not 8409 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8410 // the FieldCollector. 8411 8412 PopDeclContext(); 8413} 8414 8415// Note that FieldName may be null for anonymous bitfields. 8416bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8417 QualType FieldTy, const Expr *BitWidth, 8418 bool *ZeroWidth) { 8419 // Default to true; that shouldn't confuse checks for emptiness 8420 if (ZeroWidth) 8421 *ZeroWidth = true; 8422 8423 // C99 6.7.2.1p4 - verify the field type. 8424 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8425 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8426 // Handle incomplete types with specific error. 8427 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8428 return true; 8429 if (FieldName) 8430 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8431 << FieldName << FieldTy << BitWidth->getSourceRange(); 8432 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8433 << FieldTy << BitWidth->getSourceRange(); 8434 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8435 UPPC_BitFieldWidth)) 8436 return true; 8437 8438 // If the bit-width is type- or value-dependent, don't try to check 8439 // it now. 8440 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8441 return false; 8442 8443 llvm::APSInt Value; 8444 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8445 return true; 8446 8447 if (Value != 0 && ZeroWidth) 8448 *ZeroWidth = false; 8449 8450 // Zero-width bitfield is ok for anonymous field. 8451 if (Value == 0 && FieldName) 8452 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8453 8454 if (Value.isSigned() && Value.isNegative()) { 8455 if (FieldName) 8456 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8457 << FieldName << Value.toString(10); 8458 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8459 << Value.toString(10); 8460 } 8461 8462 if (!FieldTy->isDependentType()) { 8463 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8464 if (Value.getZExtValue() > TypeSize) { 8465 if (!getLangOptions().CPlusPlus) { 8466 if (FieldName) 8467 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8468 << FieldName << (unsigned)Value.getZExtValue() 8469 << (unsigned)TypeSize; 8470 8471 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8472 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8473 } 8474 8475 if (FieldName) 8476 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8477 << FieldName << (unsigned)Value.getZExtValue() 8478 << (unsigned)TypeSize; 8479 else 8480 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8481 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8482 } 8483 } 8484 8485 return false; 8486} 8487 8488/// ActOnField - Each field of a C struct/union is passed into this in order 8489/// to create a FieldDecl object for it. 8490Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8491 Declarator &D, Expr *BitfieldWidth) { 8492 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8493 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8494 /*HasInit=*/false, AS_public); 8495 return Res; 8496} 8497 8498/// HandleField - Analyze a field of a C struct or a C++ data member. 8499/// 8500FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8501 SourceLocation DeclStart, 8502 Declarator &D, Expr *BitWidth, bool HasInit, 8503 AccessSpecifier AS) { 8504 IdentifierInfo *II = D.getIdentifier(); 8505 SourceLocation Loc = DeclStart; 8506 if (II) Loc = D.getIdentifierLoc(); 8507 8508 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8509 QualType T = TInfo->getType(); 8510 if (getLangOptions().CPlusPlus) { 8511 CheckExtraCXXDefaultArguments(D); 8512 8513 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8514 UPPC_DataMemberType)) { 8515 D.setInvalidType(); 8516 T = Context.IntTy; 8517 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8518 } 8519 } 8520 8521 DiagnoseFunctionSpecifiers(D); 8522 8523 if (D.getDeclSpec().isThreadSpecified()) 8524 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8525 if (D.getDeclSpec().isConstexprSpecified()) 8526 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8527 << 2; 8528 8529 // Check to see if this name was declared as a member previously 8530 NamedDecl *PrevDecl = 0; 8531 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8532 LookupName(Previous, S); 8533 switch (Previous.getResultKind()) { 8534 case LookupResult::Found: 8535 case LookupResult::FoundUnresolvedValue: 8536 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8537 break; 8538 8539 case LookupResult::FoundOverloaded: 8540 PrevDecl = Previous.getRepresentativeDecl(); 8541 break; 8542 8543 case LookupResult::NotFound: 8544 case LookupResult::NotFoundInCurrentInstantiation: 8545 case LookupResult::Ambiguous: 8546 break; 8547 } 8548 Previous.suppressDiagnostics(); 8549 8550 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8551 // Maybe we will complain about the shadowed template parameter. 8552 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8553 // Just pretend that we didn't see the previous declaration. 8554 PrevDecl = 0; 8555 } 8556 8557 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8558 PrevDecl = 0; 8559 8560 bool Mutable 8561 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8562 SourceLocation TSSL = D.getSourceRange().getBegin(); 8563 FieldDecl *NewFD 8564 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8565 TSSL, AS, PrevDecl, &D); 8566 8567 if (NewFD->isInvalidDecl()) 8568 Record->setInvalidDecl(); 8569 8570 if (D.getDeclSpec().isModulePrivateSpecified()) 8571 NewFD->setModulePrivate(); 8572 8573 if (NewFD->isInvalidDecl() && PrevDecl) { 8574 // Don't introduce NewFD into scope; there's already something 8575 // with the same name in the same scope. 8576 } else if (II) { 8577 PushOnScopeChains(NewFD, S); 8578 } else 8579 Record->addDecl(NewFD); 8580 8581 return NewFD; 8582} 8583 8584/// \brief Build a new FieldDecl and check its well-formedness. 8585/// 8586/// This routine builds a new FieldDecl given the fields name, type, 8587/// record, etc. \p PrevDecl should refer to any previous declaration 8588/// with the same name and in the same scope as the field to be 8589/// created. 8590/// 8591/// \returns a new FieldDecl. 8592/// 8593/// \todo The Declarator argument is a hack. It will be removed once 8594FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8595 TypeSourceInfo *TInfo, 8596 RecordDecl *Record, SourceLocation Loc, 8597 bool Mutable, Expr *BitWidth, bool HasInit, 8598 SourceLocation TSSL, 8599 AccessSpecifier AS, NamedDecl *PrevDecl, 8600 Declarator *D) { 8601 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8602 bool InvalidDecl = false; 8603 if (D) InvalidDecl = D->isInvalidType(); 8604 8605 // If we receive a broken type, recover by assuming 'int' and 8606 // marking this declaration as invalid. 8607 if (T.isNull()) { 8608 InvalidDecl = true; 8609 T = Context.IntTy; 8610 } 8611 8612 QualType EltTy = Context.getBaseElementType(T); 8613 if (!EltTy->isDependentType() && 8614 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8615 // Fields of incomplete type force their record to be invalid. 8616 Record->setInvalidDecl(); 8617 InvalidDecl = true; 8618 } 8619 8620 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8621 // than a variably modified type. 8622 if (!InvalidDecl && T->isVariablyModifiedType()) { 8623 bool SizeIsNegative; 8624 llvm::APSInt Oversized; 8625 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8626 SizeIsNegative, 8627 Oversized); 8628 if (!FixedTy.isNull()) { 8629 Diag(Loc, diag::warn_illegal_constant_array_size); 8630 T = FixedTy; 8631 } else { 8632 if (SizeIsNegative) 8633 Diag(Loc, diag::err_typecheck_negative_array_size); 8634 else if (Oversized.getBoolValue()) 8635 Diag(Loc, diag::err_array_too_large) 8636 << Oversized.toString(10); 8637 else 8638 Diag(Loc, diag::err_typecheck_field_variable_size); 8639 InvalidDecl = true; 8640 } 8641 } 8642 8643 // Fields can not have abstract class types 8644 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8645 diag::err_abstract_type_in_decl, 8646 AbstractFieldType)) 8647 InvalidDecl = true; 8648 8649 bool ZeroWidth = false; 8650 // If this is declared as a bit-field, check the bit-field. 8651 if (!InvalidDecl && BitWidth && 8652 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8653 InvalidDecl = true; 8654 BitWidth = 0; 8655 ZeroWidth = false; 8656 } 8657 8658 // Check that 'mutable' is consistent with the type of the declaration. 8659 if (!InvalidDecl && Mutable) { 8660 unsigned DiagID = 0; 8661 if (T->isReferenceType()) 8662 DiagID = diag::err_mutable_reference; 8663 else if (T.isConstQualified()) 8664 DiagID = diag::err_mutable_const; 8665 8666 if (DiagID) { 8667 SourceLocation ErrLoc = Loc; 8668 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8669 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8670 Diag(ErrLoc, DiagID); 8671 Mutable = false; 8672 InvalidDecl = true; 8673 } 8674 } 8675 8676 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8677 BitWidth, Mutable, HasInit); 8678 if (InvalidDecl) 8679 NewFD->setInvalidDecl(); 8680 8681 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8682 Diag(Loc, diag::err_duplicate_member) << II; 8683 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8684 NewFD->setInvalidDecl(); 8685 } 8686 8687 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8688 if (Record->isUnion()) { 8689 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8690 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8691 if (RDecl->getDefinition()) { 8692 // C++ [class.union]p1: An object of a class with a non-trivial 8693 // constructor, a non-trivial copy constructor, a non-trivial 8694 // destructor, or a non-trivial copy assignment operator 8695 // cannot be a member of a union, nor can an array of such 8696 // objects. 8697 if (CheckNontrivialField(NewFD)) 8698 NewFD->setInvalidDecl(); 8699 } 8700 } 8701 8702 // C++ [class.union]p1: If a union contains a member of reference type, 8703 // the program is ill-formed. 8704 if (EltTy->isReferenceType()) { 8705 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8706 << NewFD->getDeclName() << EltTy; 8707 NewFD->setInvalidDecl(); 8708 } 8709 } 8710 } 8711 8712 // FIXME: We need to pass in the attributes given an AST 8713 // representation, not a parser representation. 8714 if (D) 8715 // FIXME: What to pass instead of TUScope? 8716 ProcessDeclAttributes(TUScope, NewFD, *D); 8717 8718 // In auto-retain/release, infer strong retension for fields of 8719 // retainable type. 8720 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8721 NewFD->setInvalidDecl(); 8722 8723 if (T.isObjCGCWeak()) 8724 Diag(Loc, diag::warn_attribute_weak_on_field); 8725 8726 NewFD->setAccess(AS); 8727 return NewFD; 8728} 8729 8730bool Sema::CheckNontrivialField(FieldDecl *FD) { 8731 assert(FD); 8732 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8733 8734 if (FD->isInvalidDecl()) 8735 return true; 8736 8737 QualType EltTy = Context.getBaseElementType(FD->getType()); 8738 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8739 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8740 if (RDecl->getDefinition()) { 8741 // We check for copy constructors before constructors 8742 // because otherwise we'll never get complaints about 8743 // copy constructors. 8744 8745 CXXSpecialMember member = CXXInvalid; 8746 if (!RDecl->hasTrivialCopyConstructor()) 8747 member = CXXCopyConstructor; 8748 else if (!RDecl->hasTrivialDefaultConstructor()) 8749 member = CXXDefaultConstructor; 8750 else if (!RDecl->hasTrivialCopyAssignment()) 8751 member = CXXCopyAssignment; 8752 else if (!RDecl->hasTrivialDestructor()) 8753 member = CXXDestructor; 8754 8755 if (member != CXXInvalid) { 8756 if (!getLangOptions().CPlusPlus0x && 8757 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8758 // Objective-C++ ARC: it is an error to have a non-trivial field of 8759 // a union. However, system headers in Objective-C programs 8760 // occasionally have Objective-C lifetime objects within unions, 8761 // and rather than cause the program to fail, we make those 8762 // members unavailable. 8763 SourceLocation Loc = FD->getLocation(); 8764 if (getSourceManager().isInSystemHeader(Loc)) { 8765 if (!FD->hasAttr<UnavailableAttr>()) 8766 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8767 "this system field has retaining ownership")); 8768 return false; 8769 } 8770 } 8771 8772 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8773 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8774 diag::err_illegal_union_or_anon_struct_member) 8775 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8776 DiagnoseNontrivial(RT, member); 8777 return !getLangOptions().CPlusPlus0x; 8778 } 8779 } 8780 } 8781 8782 return false; 8783} 8784 8785/// DiagnoseNontrivial - Given that a class has a non-trivial 8786/// special member, figure out why. 8787void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8788 QualType QT(T, 0U); 8789 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8790 8791 // Check whether the member was user-declared. 8792 switch (member) { 8793 case CXXInvalid: 8794 break; 8795 8796 case CXXDefaultConstructor: 8797 if (RD->hasUserDeclaredConstructor()) { 8798 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8799 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8800 const FunctionDecl *body = 0; 8801 ci->hasBody(body); 8802 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8803 SourceLocation CtorLoc = ci->getLocation(); 8804 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8805 return; 8806 } 8807 } 8808 8809 llvm_unreachable("found no user-declared constructors"); 8810 } 8811 break; 8812 8813 case CXXCopyConstructor: 8814 if (RD->hasUserDeclaredCopyConstructor()) { 8815 SourceLocation CtorLoc = 8816 RD->getCopyConstructor(0)->getLocation(); 8817 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8818 return; 8819 } 8820 break; 8821 8822 case CXXMoveConstructor: 8823 if (RD->hasUserDeclaredMoveConstructor()) { 8824 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8825 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8826 return; 8827 } 8828 break; 8829 8830 case CXXCopyAssignment: 8831 if (RD->hasUserDeclaredCopyAssignment()) { 8832 // FIXME: this should use the location of the copy 8833 // assignment, not the type. 8834 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8835 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8836 return; 8837 } 8838 break; 8839 8840 case CXXMoveAssignment: 8841 if (RD->hasUserDeclaredMoveAssignment()) { 8842 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8843 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8844 return; 8845 } 8846 break; 8847 8848 case CXXDestructor: 8849 if (RD->hasUserDeclaredDestructor()) { 8850 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8851 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8852 return; 8853 } 8854 break; 8855 } 8856 8857 typedef CXXRecordDecl::base_class_iterator base_iter; 8858 8859 // Virtual bases and members inhibit trivial copying/construction, 8860 // but not trivial destruction. 8861 if (member != CXXDestructor) { 8862 // Check for virtual bases. vbases includes indirect virtual bases, 8863 // so we just iterate through the direct bases. 8864 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8865 if (bi->isVirtual()) { 8866 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8867 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8868 return; 8869 } 8870 8871 // Check for virtual methods. 8872 typedef CXXRecordDecl::method_iterator meth_iter; 8873 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8874 ++mi) { 8875 if (mi->isVirtual()) { 8876 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8877 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8878 return; 8879 } 8880 } 8881 } 8882 8883 bool (CXXRecordDecl::*hasTrivial)() const; 8884 switch (member) { 8885 case CXXDefaultConstructor: 8886 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8887 case CXXCopyConstructor: 8888 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8889 case CXXCopyAssignment: 8890 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8891 case CXXDestructor: 8892 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8893 default: 8894 llvm_unreachable("unexpected special member"); 8895 } 8896 8897 // Check for nontrivial bases (and recurse). 8898 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8899 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8900 assert(BaseRT && "Don't know how to handle dependent bases"); 8901 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8902 if (!(BaseRecTy->*hasTrivial)()) { 8903 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8904 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8905 DiagnoseNontrivial(BaseRT, member); 8906 return; 8907 } 8908 } 8909 8910 // Check for nontrivial members (and recurse). 8911 typedef RecordDecl::field_iterator field_iter; 8912 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8913 ++fi) { 8914 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8915 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8916 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8917 8918 if (!(EltRD->*hasTrivial)()) { 8919 SourceLocation FLoc = (*fi)->getLocation(); 8920 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8921 DiagnoseNontrivial(EltRT, member); 8922 return; 8923 } 8924 } 8925 8926 if (EltTy->isObjCLifetimeType()) { 8927 switch (EltTy.getObjCLifetime()) { 8928 case Qualifiers::OCL_None: 8929 case Qualifiers::OCL_ExplicitNone: 8930 break; 8931 8932 case Qualifiers::OCL_Autoreleasing: 8933 case Qualifiers::OCL_Weak: 8934 case Qualifiers::OCL_Strong: 8935 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8936 << QT << EltTy.getObjCLifetime(); 8937 return; 8938 } 8939 } 8940 } 8941 8942 llvm_unreachable("found no explanation for non-trivial member"); 8943} 8944 8945/// TranslateIvarVisibility - Translate visibility from a token ID to an 8946/// AST enum value. 8947static ObjCIvarDecl::AccessControl 8948TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8949 switch (ivarVisibility) { 8950 default: llvm_unreachable("Unknown visitibility kind"); 8951 case tok::objc_private: return ObjCIvarDecl::Private; 8952 case tok::objc_public: return ObjCIvarDecl::Public; 8953 case tok::objc_protected: return ObjCIvarDecl::Protected; 8954 case tok::objc_package: return ObjCIvarDecl::Package; 8955 } 8956} 8957 8958/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8959/// in order to create an IvarDecl object for it. 8960Decl *Sema::ActOnIvar(Scope *S, 8961 SourceLocation DeclStart, 8962 Declarator &D, Expr *BitfieldWidth, 8963 tok::ObjCKeywordKind Visibility) { 8964 8965 IdentifierInfo *II = D.getIdentifier(); 8966 Expr *BitWidth = (Expr*)BitfieldWidth; 8967 SourceLocation Loc = DeclStart; 8968 if (II) Loc = D.getIdentifierLoc(); 8969 8970 // FIXME: Unnamed fields can be handled in various different ways, for 8971 // example, unnamed unions inject all members into the struct namespace! 8972 8973 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8974 QualType T = TInfo->getType(); 8975 8976 if (BitWidth) { 8977 // 6.7.2.1p3, 6.7.2.1p4 8978 if (VerifyBitField(Loc, II, T, BitWidth)) { 8979 D.setInvalidType(); 8980 BitWidth = 0; 8981 } 8982 } else { 8983 // Not a bitfield. 8984 8985 // validate II. 8986 8987 } 8988 if (T->isReferenceType()) { 8989 Diag(Loc, diag::err_ivar_reference_type); 8990 D.setInvalidType(); 8991 } 8992 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8993 // than a variably modified type. 8994 else if (T->isVariablyModifiedType()) { 8995 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8996 D.setInvalidType(); 8997 } 8998 8999 // Get the visibility (access control) for this ivar. 9000 ObjCIvarDecl::AccessControl ac = 9001 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 9002 : ObjCIvarDecl::None; 9003 // Must set ivar's DeclContext to its enclosing interface. 9004 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 9005 ObjCContainerDecl *EnclosingContext; 9006 if (ObjCImplementationDecl *IMPDecl = 9007 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9008 if (!LangOpts.ObjCNonFragileABI2) { 9009 // Case of ivar declared in an implementation. Context is that of its class. 9010 EnclosingContext = IMPDecl->getClassInterface(); 9011 assert(EnclosingContext && "Implementation has no class interface!"); 9012 } 9013 else 9014 EnclosingContext = EnclosingDecl; 9015 } else { 9016 if (ObjCCategoryDecl *CDecl = 9017 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9018 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 9019 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 9020 return 0; 9021 } 9022 } 9023 EnclosingContext = EnclosingDecl; 9024 } 9025 9026 // Construct the decl. 9027 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 9028 DeclStart, Loc, II, T, 9029 TInfo, ac, (Expr *)BitfieldWidth); 9030 9031 if (II) { 9032 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 9033 ForRedeclaration); 9034 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9035 && !isa<TagDecl>(PrevDecl)) { 9036 Diag(Loc, diag::err_duplicate_member) << II; 9037 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9038 NewID->setInvalidDecl(); 9039 } 9040 } 9041 9042 // Process attributes attached to the ivar. 9043 ProcessDeclAttributes(S, NewID, D); 9044 9045 if (D.isInvalidType()) 9046 NewID->setInvalidDecl(); 9047 9048 // In ARC, infer 'retaining' for ivars of retainable type. 9049 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9050 NewID->setInvalidDecl(); 9051 9052 if (D.getDeclSpec().isModulePrivateSpecified()) 9053 NewID->setModulePrivate(); 9054 9055 if (II) { 9056 // FIXME: When interfaces are DeclContexts, we'll need to add 9057 // these to the interface. 9058 S->AddDecl(NewID); 9059 IdResolver.AddDecl(NewID); 9060 } 9061 9062 return NewID; 9063} 9064 9065/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9066/// class and class extensions. For every class @interface and class 9067/// extension @interface, if the last ivar is a bitfield of any type, 9068/// then add an implicit `char :0` ivar to the end of that interface. 9069void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9070 SmallVectorImpl<Decl *> &AllIvarDecls) { 9071 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9072 return; 9073 9074 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9075 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9076 9077 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9078 return; 9079 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9080 if (!ID) { 9081 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9082 if (!CD->IsClassExtension()) 9083 return; 9084 } 9085 // No need to add this to end of @implementation. 9086 else 9087 return; 9088 } 9089 // All conditions are met. Add a new bitfield to the tail end of ivars. 9090 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9091 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9092 9093 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9094 DeclLoc, DeclLoc, 0, 9095 Context.CharTy, 9096 Context.getTrivialTypeSourceInfo(Context.CharTy, 9097 DeclLoc), 9098 ObjCIvarDecl::Private, BW, 9099 true); 9100 AllIvarDecls.push_back(Ivar); 9101} 9102 9103void Sema::ActOnFields(Scope* S, 9104 SourceLocation RecLoc, Decl *EnclosingDecl, 9105 llvm::ArrayRef<Decl *> Fields, 9106 SourceLocation LBrac, SourceLocation RBrac, 9107 AttributeList *Attr) { 9108 assert(EnclosingDecl && "missing record or interface decl"); 9109 9110 // If the decl this is being inserted into is invalid, then it may be a 9111 // redeclaration or some other bogus case. Don't try to add fields to it. 9112 if (EnclosingDecl->isInvalidDecl()) 9113 return; 9114 9115 // Verify that all the fields are okay. 9116 unsigned NumNamedMembers = 0; 9117 SmallVector<FieldDecl*, 32> RecFields; 9118 9119 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9120 bool ARCErrReported = false; 9121 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9122 i != end; ++i) { 9123 FieldDecl *FD = cast<FieldDecl>(*i); 9124 9125 // Get the type for the field. 9126 const Type *FDTy = FD->getType().getTypePtr(); 9127 9128 if (!FD->isAnonymousStructOrUnion()) { 9129 // Remember all fields written by the user. 9130 RecFields.push_back(FD); 9131 } 9132 9133 // If the field is already invalid for some reason, don't emit more 9134 // diagnostics about it. 9135 if (FD->isInvalidDecl()) { 9136 EnclosingDecl->setInvalidDecl(); 9137 continue; 9138 } 9139 9140 // C99 6.7.2.1p2: 9141 // A structure or union shall not contain a member with 9142 // incomplete or function type (hence, a structure shall not 9143 // contain an instance of itself, but may contain a pointer to 9144 // an instance of itself), except that the last member of a 9145 // structure with more than one named member may have incomplete 9146 // array type; such a structure (and any union containing, 9147 // possibly recursively, a member that is such a structure) 9148 // shall not be a member of a structure or an element of an 9149 // array. 9150 if (FDTy->isFunctionType()) { 9151 // Field declared as a function. 9152 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9153 << FD->getDeclName(); 9154 FD->setInvalidDecl(); 9155 EnclosingDecl->setInvalidDecl(); 9156 continue; 9157 } else if (FDTy->isIncompleteArrayType() && Record && 9158 ((i + 1 == Fields.end() && !Record->isUnion()) || 9159 ((getLangOptions().MicrosoftExt || 9160 getLangOptions().CPlusPlus) && 9161 (i + 1 == Fields.end() || Record->isUnion())))) { 9162 // Flexible array member. 9163 // Microsoft and g++ is more permissive regarding flexible array. 9164 // It will accept flexible array in union and also 9165 // as the sole element of a struct/class. 9166 if (getLangOptions().MicrosoftExt) { 9167 if (Record->isUnion()) 9168 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9169 << FD->getDeclName(); 9170 else if (Fields.size() == 1) 9171 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9172 << FD->getDeclName() << Record->getTagKind(); 9173 } else if (getLangOptions().CPlusPlus) { 9174 if (Record->isUnion()) 9175 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9176 << FD->getDeclName(); 9177 else if (Fields.size() == 1) 9178 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9179 << FD->getDeclName() << Record->getTagKind(); 9180 } else if (NumNamedMembers < 1) { 9181 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9182 << FD->getDeclName(); 9183 FD->setInvalidDecl(); 9184 EnclosingDecl->setInvalidDecl(); 9185 continue; 9186 } 9187 if (!FD->getType()->isDependentType() && 9188 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9189 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9190 << FD->getDeclName() << FD->getType(); 9191 FD->setInvalidDecl(); 9192 EnclosingDecl->setInvalidDecl(); 9193 continue; 9194 } 9195 // Okay, we have a legal flexible array member at the end of the struct. 9196 if (Record) 9197 Record->setHasFlexibleArrayMember(true); 9198 } else if (!FDTy->isDependentType() && 9199 RequireCompleteType(FD->getLocation(), FD->getType(), 9200 diag::err_field_incomplete)) { 9201 // Incomplete type 9202 FD->setInvalidDecl(); 9203 EnclosingDecl->setInvalidDecl(); 9204 continue; 9205 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9206 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9207 // If this is a member of a union, then entire union becomes "flexible". 9208 if (Record && Record->isUnion()) { 9209 Record->setHasFlexibleArrayMember(true); 9210 } else { 9211 // If this is a struct/class and this is not the last element, reject 9212 // it. Note that GCC supports variable sized arrays in the middle of 9213 // structures. 9214 if (i + 1 != Fields.end()) 9215 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9216 << FD->getDeclName() << FD->getType(); 9217 else { 9218 // We support flexible arrays at the end of structs in 9219 // other structs as an extension. 9220 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9221 << FD->getDeclName(); 9222 if (Record) 9223 Record->setHasFlexibleArrayMember(true); 9224 } 9225 } 9226 } 9227 if (Record && FDTTy->getDecl()->hasObjectMember()) 9228 Record->setHasObjectMember(true); 9229 } else if (FDTy->isObjCObjectType()) { 9230 /// A field cannot be an Objective-c object 9231 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9232 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9233 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9234 FD->setType(T); 9235 } 9236 else if (!getLangOptions().CPlusPlus) { 9237 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9238 // It's an error in ARC if a field has lifetime. 9239 // We don't want to report this in a system header, though, 9240 // so we just make the field unavailable. 9241 // FIXME: that's really not sufficient; we need to make the type 9242 // itself invalid to, say, initialize or copy. 9243 QualType T = FD->getType(); 9244 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9245 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9246 SourceLocation loc = FD->getLocation(); 9247 if (getSourceManager().isInSystemHeader(loc)) { 9248 if (!FD->hasAttr<UnavailableAttr>()) { 9249 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9250 "this system field has retaining ownership")); 9251 } 9252 } else { 9253 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9254 << T->isBlockPointerType(); 9255 } 9256 ARCErrReported = true; 9257 } 9258 } 9259 else if (getLangOptions().ObjC1 && 9260 getLangOptions().getGC() != LangOptions::NonGC && 9261 Record && !Record->hasObjectMember()) { 9262 if (FD->getType()->isObjCObjectPointerType() || 9263 FD->getType().isObjCGCStrong()) 9264 Record->setHasObjectMember(true); 9265 else if (Context.getAsArrayType(FD->getType())) { 9266 QualType BaseType = Context.getBaseElementType(FD->getType()); 9267 if (BaseType->isRecordType() && 9268 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9269 Record->setHasObjectMember(true); 9270 else if (BaseType->isObjCObjectPointerType() || 9271 BaseType.isObjCGCStrong()) 9272 Record->setHasObjectMember(true); 9273 } 9274 } 9275 } 9276 // Keep track of the number of named members. 9277 if (FD->getIdentifier()) 9278 ++NumNamedMembers; 9279 } 9280 9281 // Okay, we successfully defined 'Record'. 9282 if (Record) { 9283 bool Completed = false; 9284 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9285 if (!CXXRecord->isInvalidDecl()) { 9286 // Set access bits correctly on the directly-declared conversions. 9287 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9288 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9289 I != E; ++I) 9290 Convs->setAccess(I, (*I)->getAccess()); 9291 9292 if (!CXXRecord->isDependentType()) { 9293 // Objective-C Automatic Reference Counting: 9294 // If a class has a non-static data member of Objective-C pointer 9295 // type (or array thereof), it is a non-POD type and its 9296 // default constructor (if any), copy constructor, copy assignment 9297 // operator, and destructor are non-trivial. 9298 // 9299 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9300 // However, here we check whether this particular class is only 9301 // non-POD because of the presence of an Objective-C pointer member. 9302 // If so, objects of this type cannot be shared between code compiled 9303 // with instant objects and code compiled with manual retain/release. 9304 if (getLangOptions().ObjCAutoRefCount && 9305 CXXRecord->hasObjectMember() && 9306 CXXRecord->getLinkage() == ExternalLinkage) { 9307 if (CXXRecord->isPOD()) { 9308 Diag(CXXRecord->getLocation(), 9309 diag::warn_arc_non_pod_class_with_object_member) 9310 << CXXRecord; 9311 } else { 9312 // FIXME: Fix-Its would be nice here, but finding a good location 9313 // for them is going to be tricky. 9314 if (CXXRecord->hasTrivialCopyConstructor()) 9315 Diag(CXXRecord->getLocation(), 9316 diag::warn_arc_trivial_member_function_with_object_member) 9317 << CXXRecord << 0; 9318 if (CXXRecord->hasTrivialCopyAssignment()) 9319 Diag(CXXRecord->getLocation(), 9320 diag::warn_arc_trivial_member_function_with_object_member) 9321 << CXXRecord << 1; 9322 if (CXXRecord->hasTrivialDestructor()) 9323 Diag(CXXRecord->getLocation(), 9324 diag::warn_arc_trivial_member_function_with_object_member) 9325 << CXXRecord << 2; 9326 } 9327 } 9328 9329 // Adjust user-defined destructor exception spec. 9330 if (getLangOptions().CPlusPlus0x && 9331 CXXRecord->hasUserDeclaredDestructor()) 9332 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9333 9334 // Add any implicitly-declared members to this class. 9335 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9336 9337 // If we have virtual base classes, we may end up finding multiple 9338 // final overriders for a given virtual function. Check for this 9339 // problem now. 9340 if (CXXRecord->getNumVBases()) { 9341 CXXFinalOverriderMap FinalOverriders; 9342 CXXRecord->getFinalOverriders(FinalOverriders); 9343 9344 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9345 MEnd = FinalOverriders.end(); 9346 M != MEnd; ++M) { 9347 for (OverridingMethods::iterator SO = M->second.begin(), 9348 SOEnd = M->second.end(); 9349 SO != SOEnd; ++SO) { 9350 assert(SO->second.size() > 0 && 9351 "Virtual function without overridding functions?"); 9352 if (SO->second.size() == 1) 9353 continue; 9354 9355 // C++ [class.virtual]p2: 9356 // In a derived class, if a virtual member function of a base 9357 // class subobject has more than one final overrider the 9358 // program is ill-formed. 9359 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9360 << (NamedDecl *)M->first << Record; 9361 Diag(M->first->getLocation(), 9362 diag::note_overridden_virtual_function); 9363 for (OverridingMethods::overriding_iterator 9364 OM = SO->second.begin(), 9365 OMEnd = SO->second.end(); 9366 OM != OMEnd; ++OM) 9367 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9368 << (NamedDecl *)M->first << OM->Method->getParent(); 9369 9370 Record->setInvalidDecl(); 9371 } 9372 } 9373 CXXRecord->completeDefinition(&FinalOverriders); 9374 Completed = true; 9375 } 9376 } 9377 } 9378 } 9379 9380 if (!Completed) 9381 Record->completeDefinition(); 9382 9383 // Now that the record is complete, do any delayed exception spec checks 9384 // we were missing. 9385 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9386 const CXXDestructorDecl *Dtor = 9387 DelayedDestructorExceptionSpecChecks.back().first; 9388 if (Dtor->getParent() != Record) 9389 break; 9390 9391 assert(!Dtor->getParent()->isDependentType() && 9392 "Should not ever add destructors of templates into the list."); 9393 CheckOverridingFunctionExceptionSpec(Dtor, 9394 DelayedDestructorExceptionSpecChecks.back().second); 9395 DelayedDestructorExceptionSpecChecks.pop_back(); 9396 } 9397 9398 } else { 9399 ObjCIvarDecl **ClsFields = 9400 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9401 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9402 ID->setEndOfDefinitionLoc(RBrac); 9403 // Add ivar's to class's DeclContext. 9404 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9405 ClsFields[i]->setLexicalDeclContext(ID); 9406 ID->addDecl(ClsFields[i]); 9407 } 9408 // Must enforce the rule that ivars in the base classes may not be 9409 // duplicates. 9410 if (ID->getSuperClass()) 9411 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9412 } else if (ObjCImplementationDecl *IMPDecl = 9413 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9414 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9415 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9416 // Ivar declared in @implementation never belongs to the implementation. 9417 // Only it is in implementation's lexical context. 9418 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9419 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9420 } else if (ObjCCategoryDecl *CDecl = 9421 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9422 // case of ivars in class extension; all other cases have been 9423 // reported as errors elsewhere. 9424 // FIXME. Class extension does not have a LocEnd field. 9425 // CDecl->setLocEnd(RBrac); 9426 // Add ivar's to class extension's DeclContext. 9427 // Diagnose redeclaration of private ivars. 9428 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9429 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9430 if (IDecl) { 9431 if (const ObjCIvarDecl *ClsIvar = 9432 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9433 Diag(ClsFields[i]->getLocation(), 9434 diag::err_duplicate_ivar_declaration); 9435 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9436 continue; 9437 } 9438 for (const ObjCCategoryDecl *ClsExtDecl = 9439 IDecl->getFirstClassExtension(); 9440 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9441 if (const ObjCIvarDecl *ClsExtIvar = 9442 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9443 Diag(ClsFields[i]->getLocation(), 9444 diag::err_duplicate_ivar_declaration); 9445 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9446 continue; 9447 } 9448 } 9449 } 9450 ClsFields[i]->setLexicalDeclContext(CDecl); 9451 CDecl->addDecl(ClsFields[i]); 9452 } 9453 } 9454 } 9455 9456 if (Attr) 9457 ProcessDeclAttributeList(S, Record, Attr); 9458 9459 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9460 // set the visibility of this record. 9461 if (Record && !Record->getDeclContext()->isRecord()) 9462 AddPushedVisibilityAttribute(Record); 9463} 9464 9465/// \brief Determine whether the given integral value is representable within 9466/// the given type T. 9467static bool isRepresentableIntegerValue(ASTContext &Context, 9468 llvm::APSInt &Value, 9469 QualType T) { 9470 assert(T->isIntegralType(Context) && "Integral type required!"); 9471 unsigned BitWidth = Context.getIntWidth(T); 9472 9473 if (Value.isUnsigned() || Value.isNonNegative()) { 9474 if (T->isSignedIntegerOrEnumerationType()) 9475 --BitWidth; 9476 return Value.getActiveBits() <= BitWidth; 9477 } 9478 return Value.getMinSignedBits() <= BitWidth; 9479} 9480 9481// \brief Given an integral type, return the next larger integral type 9482// (or a NULL type of no such type exists). 9483static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9484 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9485 // enum checking below. 9486 assert(T->isIntegralType(Context) && "Integral type required!"); 9487 const unsigned NumTypes = 4; 9488 QualType SignedIntegralTypes[NumTypes] = { 9489 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9490 }; 9491 QualType UnsignedIntegralTypes[NumTypes] = { 9492 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9493 Context.UnsignedLongLongTy 9494 }; 9495 9496 unsigned BitWidth = Context.getTypeSize(T); 9497 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9498 : UnsignedIntegralTypes; 9499 for (unsigned I = 0; I != NumTypes; ++I) 9500 if (Context.getTypeSize(Types[I]) > BitWidth) 9501 return Types[I]; 9502 9503 return QualType(); 9504} 9505 9506EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9507 EnumConstantDecl *LastEnumConst, 9508 SourceLocation IdLoc, 9509 IdentifierInfo *Id, 9510 Expr *Val) { 9511 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9512 llvm::APSInt EnumVal(IntWidth); 9513 QualType EltTy; 9514 9515 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9516 Val = 0; 9517 9518 if (Val) 9519 Val = DefaultLvalueConversion(Val).take(); 9520 9521 if (Val) { 9522 if (Enum->isDependentType() || Val->isTypeDependent()) 9523 EltTy = Context.DependentTy; 9524 else { 9525 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9526 SourceLocation ExpLoc; 9527 if (!Val->isValueDependent() && 9528 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9529 Val = 0; 9530 } else { 9531 if (!getLangOptions().CPlusPlus) { 9532 // C99 6.7.2.2p2: 9533 // The expression that defines the value of an enumeration constant 9534 // shall be an integer constant expression that has a value 9535 // representable as an int. 9536 9537 // Complain if the value is not representable in an int. 9538 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9539 Diag(IdLoc, diag::ext_enum_value_not_int) 9540 << EnumVal.toString(10) << Val->getSourceRange() 9541 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9542 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9543 // Force the type of the expression to 'int'. 9544 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9545 } 9546 } 9547 9548 if (Enum->isFixed()) { 9549 EltTy = Enum->getIntegerType(); 9550 9551 // C++0x [dcl.enum]p5: 9552 // ... if the initializing value of an enumerator cannot be 9553 // represented by the underlying type, the program is ill-formed. 9554 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9555 if (getLangOptions().MicrosoftExt) { 9556 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9557 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9558 } else 9559 Diag(IdLoc, diag::err_enumerator_too_large) 9560 << EltTy; 9561 } else 9562 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9563 } 9564 else { 9565 // C++0x [dcl.enum]p5: 9566 // If the underlying type is not fixed, the type of each enumerator 9567 // is the type of its initializing value: 9568 // - If an initializer is specified for an enumerator, the 9569 // initializing value has the same type as the expression. 9570 EltTy = Val->getType(); 9571 } 9572 } 9573 } 9574 } 9575 9576 if (!Val) { 9577 if (Enum->isDependentType()) 9578 EltTy = Context.DependentTy; 9579 else if (!LastEnumConst) { 9580 // C++0x [dcl.enum]p5: 9581 // If the underlying type is not fixed, the type of each enumerator 9582 // is the type of its initializing value: 9583 // - If no initializer is specified for the first enumerator, the 9584 // initializing value has an unspecified integral type. 9585 // 9586 // GCC uses 'int' for its unspecified integral type, as does 9587 // C99 6.7.2.2p3. 9588 if (Enum->isFixed()) { 9589 EltTy = Enum->getIntegerType(); 9590 } 9591 else { 9592 EltTy = Context.IntTy; 9593 } 9594 } else { 9595 // Assign the last value + 1. 9596 EnumVal = LastEnumConst->getInitVal(); 9597 ++EnumVal; 9598 EltTy = LastEnumConst->getType(); 9599 9600 // Check for overflow on increment. 9601 if (EnumVal < LastEnumConst->getInitVal()) { 9602 // C++0x [dcl.enum]p5: 9603 // If the underlying type is not fixed, the type of each enumerator 9604 // is the type of its initializing value: 9605 // 9606 // - Otherwise the type of the initializing value is the same as 9607 // the type of the initializing value of the preceding enumerator 9608 // unless the incremented value is not representable in that type, 9609 // in which case the type is an unspecified integral type 9610 // sufficient to contain the incremented value. If no such type 9611 // exists, the program is ill-formed. 9612 QualType T = getNextLargerIntegralType(Context, EltTy); 9613 if (T.isNull() || Enum->isFixed()) { 9614 // There is no integral type larger enough to represent this 9615 // value. Complain, then allow the value to wrap around. 9616 EnumVal = LastEnumConst->getInitVal(); 9617 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9618 ++EnumVal; 9619 if (Enum->isFixed()) 9620 // When the underlying type is fixed, this is ill-formed. 9621 Diag(IdLoc, diag::err_enumerator_wrapped) 9622 << EnumVal.toString(10) 9623 << EltTy; 9624 else 9625 Diag(IdLoc, diag::warn_enumerator_too_large) 9626 << EnumVal.toString(10); 9627 } else { 9628 EltTy = T; 9629 } 9630 9631 // Retrieve the last enumerator's value, extent that type to the 9632 // type that is supposed to be large enough to represent the incremented 9633 // value, then increment. 9634 EnumVal = LastEnumConst->getInitVal(); 9635 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9636 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9637 ++EnumVal; 9638 9639 // If we're not in C++, diagnose the overflow of enumerator values, 9640 // which in C99 means that the enumerator value is not representable in 9641 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9642 // permits enumerator values that are representable in some larger 9643 // integral type. 9644 if (!getLangOptions().CPlusPlus && !T.isNull()) 9645 Diag(IdLoc, diag::warn_enum_value_overflow); 9646 } else if (!getLangOptions().CPlusPlus && 9647 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9648 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9649 Diag(IdLoc, diag::ext_enum_value_not_int) 9650 << EnumVal.toString(10) << 1; 9651 } 9652 } 9653 } 9654 9655 if (!EltTy->isDependentType()) { 9656 // Make the enumerator value match the signedness and size of the 9657 // enumerator's type. 9658 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9659 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9660 } 9661 9662 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9663 Val, EnumVal); 9664} 9665 9666 9667Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9668 SourceLocation IdLoc, IdentifierInfo *Id, 9669 AttributeList *Attr, 9670 SourceLocation EqualLoc, Expr *val) { 9671 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9672 EnumConstantDecl *LastEnumConst = 9673 cast_or_null<EnumConstantDecl>(lastEnumConst); 9674 Expr *Val = static_cast<Expr*>(val); 9675 9676 // The scope passed in may not be a decl scope. Zip up the scope tree until 9677 // we find one that is. 9678 S = getNonFieldDeclScope(S); 9679 9680 // Verify that there isn't already something declared with this name in this 9681 // scope. 9682 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9683 ForRedeclaration); 9684 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9685 // Maybe we will complain about the shadowed template parameter. 9686 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9687 // Just pretend that we didn't see the previous declaration. 9688 PrevDecl = 0; 9689 } 9690 9691 if (PrevDecl) { 9692 // When in C++, we may get a TagDecl with the same name; in this case the 9693 // enum constant will 'hide' the tag. 9694 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9695 "Received TagDecl when not in C++!"); 9696 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9697 if (isa<EnumConstantDecl>(PrevDecl)) 9698 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9699 else 9700 Diag(IdLoc, diag::err_redefinition) << Id; 9701 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9702 return 0; 9703 } 9704 } 9705 9706 // C++ [class.mem]p13: 9707 // If T is the name of a class, then each of the following shall have a 9708 // name different from T: 9709 // - every enumerator of every member of class T that is an enumerated 9710 // type 9711 if (CXXRecordDecl *Record 9712 = dyn_cast<CXXRecordDecl>( 9713 TheEnumDecl->getDeclContext()->getRedeclContext())) 9714 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9715 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9716 9717 EnumConstantDecl *New = 9718 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9719 9720 if (New) { 9721 // Process attributes. 9722 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9723 9724 // Register this decl in the current scope stack. 9725 New->setAccess(TheEnumDecl->getAccess()); 9726 PushOnScopeChains(New, S); 9727 } 9728 9729 return New; 9730} 9731 9732void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9733 SourceLocation RBraceLoc, Decl *EnumDeclX, 9734 Decl **Elements, unsigned NumElements, 9735 Scope *S, AttributeList *Attr) { 9736 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9737 QualType EnumType = Context.getTypeDeclType(Enum); 9738 9739 if (Attr) 9740 ProcessDeclAttributeList(S, Enum, Attr); 9741 9742 if (Enum->isDependentType()) { 9743 for (unsigned i = 0; i != NumElements; ++i) { 9744 EnumConstantDecl *ECD = 9745 cast_or_null<EnumConstantDecl>(Elements[i]); 9746 if (!ECD) continue; 9747 9748 ECD->setType(EnumType); 9749 } 9750 9751 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9752 return; 9753 } 9754 9755 // TODO: If the result value doesn't fit in an int, it must be a long or long 9756 // long value. ISO C does not support this, but GCC does as an extension, 9757 // emit a warning. 9758 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9759 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9760 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9761 9762 // Verify that all the values are okay, compute the size of the values, and 9763 // reverse the list. 9764 unsigned NumNegativeBits = 0; 9765 unsigned NumPositiveBits = 0; 9766 9767 // Keep track of whether all elements have type int. 9768 bool AllElementsInt = true; 9769 9770 for (unsigned i = 0; i != NumElements; ++i) { 9771 EnumConstantDecl *ECD = 9772 cast_or_null<EnumConstantDecl>(Elements[i]); 9773 if (!ECD) continue; // Already issued a diagnostic. 9774 9775 const llvm::APSInt &InitVal = ECD->getInitVal(); 9776 9777 // Keep track of the size of positive and negative values. 9778 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9779 NumPositiveBits = std::max(NumPositiveBits, 9780 (unsigned)InitVal.getActiveBits()); 9781 else 9782 NumNegativeBits = std::max(NumNegativeBits, 9783 (unsigned)InitVal.getMinSignedBits()); 9784 9785 // Keep track of whether every enum element has type int (very commmon). 9786 if (AllElementsInt) 9787 AllElementsInt = ECD->getType() == Context.IntTy; 9788 } 9789 9790 // Figure out the type that should be used for this enum. 9791 QualType BestType; 9792 unsigned BestWidth; 9793 9794 // C++0x N3000 [conv.prom]p3: 9795 // An rvalue of an unscoped enumeration type whose underlying 9796 // type is not fixed can be converted to an rvalue of the first 9797 // of the following types that can represent all the values of 9798 // the enumeration: int, unsigned int, long int, unsigned long 9799 // int, long long int, or unsigned long long int. 9800 // C99 6.4.4.3p2: 9801 // An identifier declared as an enumeration constant has type int. 9802 // The C99 rule is modified by a gcc extension 9803 QualType BestPromotionType; 9804 9805 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9806 // -fshort-enums is the equivalent to specifying the packed attribute on all 9807 // enum definitions. 9808 if (LangOpts.ShortEnums) 9809 Packed = true; 9810 9811 if (Enum->isFixed()) { 9812 BestType = Enum->getIntegerType(); 9813 if (BestType->isPromotableIntegerType()) 9814 BestPromotionType = Context.getPromotedIntegerType(BestType); 9815 else 9816 BestPromotionType = BestType; 9817 // We don't need to set BestWidth, because BestType is going to be the type 9818 // of the enumerators, but we do anyway because otherwise some compilers 9819 // warn that it might be used uninitialized. 9820 BestWidth = CharWidth; 9821 } 9822 else if (NumNegativeBits) { 9823 // If there is a negative value, figure out the smallest integer type (of 9824 // int/long/longlong) that fits. 9825 // If it's packed, check also if it fits a char or a short. 9826 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9827 BestType = Context.SignedCharTy; 9828 BestWidth = CharWidth; 9829 } else if (Packed && NumNegativeBits <= ShortWidth && 9830 NumPositiveBits < ShortWidth) { 9831 BestType = Context.ShortTy; 9832 BestWidth = ShortWidth; 9833 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9834 BestType = Context.IntTy; 9835 BestWidth = IntWidth; 9836 } else { 9837 BestWidth = Context.getTargetInfo().getLongWidth(); 9838 9839 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9840 BestType = Context.LongTy; 9841 } else { 9842 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9843 9844 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9845 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9846 BestType = Context.LongLongTy; 9847 } 9848 } 9849 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9850 } else { 9851 // If there is no negative value, figure out the smallest type that fits 9852 // all of the enumerator values. 9853 // If it's packed, check also if it fits a char or a short. 9854 if (Packed && NumPositiveBits <= CharWidth) { 9855 BestType = Context.UnsignedCharTy; 9856 BestPromotionType = Context.IntTy; 9857 BestWidth = CharWidth; 9858 } else if (Packed && NumPositiveBits <= ShortWidth) { 9859 BestType = Context.UnsignedShortTy; 9860 BestPromotionType = Context.IntTy; 9861 BestWidth = ShortWidth; 9862 } else if (NumPositiveBits <= IntWidth) { 9863 BestType = Context.UnsignedIntTy; 9864 BestWidth = IntWidth; 9865 BestPromotionType 9866 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9867 ? Context.UnsignedIntTy : Context.IntTy; 9868 } else if (NumPositiveBits <= 9869 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9870 BestType = Context.UnsignedLongTy; 9871 BestPromotionType 9872 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9873 ? Context.UnsignedLongTy : Context.LongTy; 9874 } else { 9875 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9876 assert(NumPositiveBits <= BestWidth && 9877 "How could an initializer get larger than ULL?"); 9878 BestType = Context.UnsignedLongLongTy; 9879 BestPromotionType 9880 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9881 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9882 } 9883 } 9884 9885 // Loop over all of the enumerator constants, changing their types to match 9886 // the type of the enum if needed. 9887 for (unsigned i = 0; i != NumElements; ++i) { 9888 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9889 if (!ECD) continue; // Already issued a diagnostic. 9890 9891 // Standard C says the enumerators have int type, but we allow, as an 9892 // extension, the enumerators to be larger than int size. If each 9893 // enumerator value fits in an int, type it as an int, otherwise type it the 9894 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9895 // that X has type 'int', not 'unsigned'. 9896 9897 // Determine whether the value fits into an int. 9898 llvm::APSInt InitVal = ECD->getInitVal(); 9899 9900 // If it fits into an integer type, force it. Otherwise force it to match 9901 // the enum decl type. 9902 QualType NewTy; 9903 unsigned NewWidth; 9904 bool NewSign; 9905 if (!getLangOptions().CPlusPlus && 9906 !Enum->isFixed() && 9907 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9908 NewTy = Context.IntTy; 9909 NewWidth = IntWidth; 9910 NewSign = true; 9911 } else if (ECD->getType() == BestType) { 9912 // Already the right type! 9913 if (getLangOptions().CPlusPlus) 9914 // C++ [dcl.enum]p4: Following the closing brace of an 9915 // enum-specifier, each enumerator has the type of its 9916 // enumeration. 9917 ECD->setType(EnumType); 9918 continue; 9919 } else { 9920 NewTy = BestType; 9921 NewWidth = BestWidth; 9922 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9923 } 9924 9925 // Adjust the APSInt value. 9926 InitVal = InitVal.extOrTrunc(NewWidth); 9927 InitVal.setIsSigned(NewSign); 9928 ECD->setInitVal(InitVal); 9929 9930 // Adjust the Expr initializer and type. 9931 if (ECD->getInitExpr() && 9932 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9933 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9934 CK_IntegralCast, 9935 ECD->getInitExpr(), 9936 /*base paths*/ 0, 9937 VK_RValue)); 9938 if (getLangOptions().CPlusPlus) 9939 // C++ [dcl.enum]p4: Following the closing brace of an 9940 // enum-specifier, each enumerator has the type of its 9941 // enumeration. 9942 ECD->setType(EnumType); 9943 else 9944 ECD->setType(NewTy); 9945 } 9946 9947 Enum->completeDefinition(BestType, BestPromotionType, 9948 NumPositiveBits, NumNegativeBits); 9949} 9950 9951Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9952 SourceLocation StartLoc, 9953 SourceLocation EndLoc) { 9954 StringLiteral *AsmString = cast<StringLiteral>(expr); 9955 9956 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9957 AsmString, StartLoc, 9958 EndLoc); 9959 CurContext->addDecl(New); 9960 return New; 9961} 9962 9963DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 9964 SourceLocation ImportLoc, 9965 ModuleIdPath Path) { 9966 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 9967 Module::AllVisible, 9968 /*IsIncludeDirective=*/false); 9969 if (!Mod) 9970 return true; 9971 9972 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 9973 Module *ModCheck = Mod; 9974 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 9975 // If we've run out of module parents, just drop the remaining identifiers. 9976 // We need the length to be consistent. 9977 if (!ModCheck) 9978 break; 9979 ModCheck = ModCheck->Parent; 9980 9981 IdentifierLocs.push_back(Path[I].second); 9982 } 9983 9984 ImportDecl *Import = ImportDecl::Create(Context, 9985 Context.getTranslationUnitDecl(), 9986 AtLoc.isValid()? AtLoc : ImportLoc, 9987 Mod, IdentifierLocs); 9988 Context.getTranslationUnitDecl()->addDecl(Import); 9989 return Import; 9990} 9991 9992void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9993 SourceLocation PragmaLoc, 9994 SourceLocation NameLoc) { 9995 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9996 9997 if (PrevDecl) { 9998 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9999 } else { 10000 (void)WeakUndeclaredIdentifiers.insert( 10001 std::pair<IdentifierInfo*,WeakInfo> 10002 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 10003 } 10004} 10005 10006void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 10007 IdentifierInfo* AliasName, 10008 SourceLocation PragmaLoc, 10009 SourceLocation NameLoc, 10010 SourceLocation AliasNameLoc) { 10011 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 10012 LookupOrdinaryName); 10013 WeakInfo W = WeakInfo(Name, NameLoc); 10014 10015 if (PrevDecl) { 10016 if (!PrevDecl->hasAttr<AliasAttr>()) 10017 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 10018 DeclApplyPragmaWeak(TUScope, ND, W); 10019 } else { 10020 (void)WeakUndeclaredIdentifiers.insert( 10021 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 10022 } 10023} 10024 10025Decl *Sema::getObjCDeclContext() const { 10026 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 10027} 10028 10029AvailabilityResult Sema::getCurContextAvailability() const { 10030 const Decl *D = cast<Decl>(getCurLexicalContext()); 10031 // A category implicitly has the availability of the interface. 10032 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 10033 D = CatD->getClassInterface(); 10034 10035 return D->getAvailability(); 10036} 10037