SemaDecl.cpp revision 0179868cce096101236261ff64eca30224b1f233
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/SmallString.h" 43#include "llvm/ADT/Triple.h" 44#include <algorithm> 45#include <cstring> 46#include <functional> 47using namespace clang; 48using namespace sema; 49 50Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 51 if (OwnedType) { 52 Decl *Group[2] = { OwnedType, Ptr }; 53 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 54 } 55 56 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 57} 58 59namespace { 60 61class TypeNameValidatorCCC : public CorrectionCandidateCallback { 62 public: 63 TypeNameValidatorCCC(bool AllowInvalid) : AllowInvalidDecl(AllowInvalid) { 64 WantExpressionKeywords = false; 65 WantCXXNamedCasts = false; 66 WantRemainingKeywords = false; 67 } 68 69 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 70 if (NamedDecl *ND = candidate.getCorrectionDecl()) 71 return (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND)) && 72 (AllowInvalidDecl || !ND->isInvalidDecl()); 73 else 74 return candidate.isKeyword(); 75 } 76 77 private: 78 bool AllowInvalidDecl; 79}; 80 81} 82 83/// \brief If the identifier refers to a type name within this scope, 84/// return the declaration of that type. 85/// 86/// This routine performs ordinary name lookup of the identifier II 87/// within the given scope, with optional C++ scope specifier SS, to 88/// determine whether the name refers to a type. If so, returns an 89/// opaque pointer (actually a QualType) corresponding to that 90/// type. Otherwise, returns NULL. 91/// 92/// If name lookup results in an ambiguity, this routine will complain 93/// and then return NULL. 94ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 95 Scope *S, CXXScopeSpec *SS, 96 bool isClassName, bool HasTrailingDot, 97 ParsedType ObjectTypePtr, 98 bool IsCtorOrDtorName, 99 bool WantNontrivialTypeSourceInfo, 100 IdentifierInfo **CorrectedII) { 101 // Determine where we will perform name lookup. 102 DeclContext *LookupCtx = 0; 103 if (ObjectTypePtr) { 104 QualType ObjectType = ObjectTypePtr.get(); 105 if (ObjectType->isRecordType()) 106 LookupCtx = computeDeclContext(ObjectType); 107 } else if (SS && SS->isNotEmpty()) { 108 LookupCtx = computeDeclContext(*SS, false); 109 110 if (!LookupCtx) { 111 if (isDependentScopeSpecifier(*SS)) { 112 // C++ [temp.res]p3: 113 // A qualified-id that refers to a type and in which the 114 // nested-name-specifier depends on a template-parameter (14.6.2) 115 // shall be prefixed by the keyword typename to indicate that the 116 // qualified-id denotes a type, forming an 117 // elaborated-type-specifier (7.1.5.3). 118 // 119 // We therefore do not perform any name lookup if the result would 120 // refer to a member of an unknown specialization. 121 if (!isClassName) 122 return ParsedType(); 123 124 // We know from the grammar that this name refers to a type, 125 // so build a dependent node to describe the type. 126 if (WantNontrivialTypeSourceInfo) 127 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 128 129 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 130 QualType T = 131 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 132 II, NameLoc); 133 134 return ParsedType::make(T); 135 } 136 137 return ParsedType(); 138 } 139 140 if (!LookupCtx->isDependentContext() && 141 RequireCompleteDeclContext(*SS, LookupCtx)) 142 return ParsedType(); 143 } 144 145 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 146 // lookup for class-names. 147 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 148 LookupOrdinaryName; 149 LookupResult Result(*this, &II, NameLoc, Kind); 150 if (LookupCtx) { 151 // Perform "qualified" name lookup into the declaration context we 152 // computed, which is either the type of the base of a member access 153 // expression or the declaration context associated with a prior 154 // nested-name-specifier. 155 LookupQualifiedName(Result, LookupCtx); 156 157 if (ObjectTypePtr && Result.empty()) { 158 // C++ [basic.lookup.classref]p3: 159 // If the unqualified-id is ~type-name, the type-name is looked up 160 // in the context of the entire postfix-expression. If the type T of 161 // the object expression is of a class type C, the type-name is also 162 // looked up in the scope of class C. At least one of the lookups shall 163 // find a name that refers to (possibly cv-qualified) T. 164 LookupName(Result, S); 165 } 166 } else { 167 // Perform unqualified name lookup. 168 LookupName(Result, S); 169 } 170 171 NamedDecl *IIDecl = 0; 172 switch (Result.getResultKind()) { 173 case LookupResult::NotFound: 174 case LookupResult::NotFoundInCurrentInstantiation: 175 if (CorrectedII) { 176 TypeNameValidatorCCC Validator(true); 177 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), 178 Kind, S, SS, Validator); 179 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); 180 TemplateTy Template; 181 bool MemberOfUnknownSpecialization; 182 UnqualifiedId TemplateName; 183 TemplateName.setIdentifier(NewII, NameLoc); 184 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); 185 CXXScopeSpec NewSS, *NewSSPtr = SS; 186 if (SS && NNS) { 187 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); 188 NewSSPtr = &NewSS; 189 } 190 if (Correction && (NNS || NewII != &II) && 191 // Ignore a correction to a template type as the to-be-corrected 192 // identifier is not a template (typo correction for template names 193 // is handled elsewhere). 194 !(getLangOpts().CPlusPlus && NewSSPtr && 195 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(), 196 false, Template, MemberOfUnknownSpecialization))) { 197 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, 198 isClassName, HasTrailingDot, ObjectTypePtr, 199 IsCtorOrDtorName, 200 WantNontrivialTypeSourceInfo); 201 if (Ty) { 202 std::string CorrectedStr(Correction.getAsString(getLangOpts())); 203 std::string CorrectedQuotedStr( 204 Correction.getQuoted(getLangOpts())); 205 Diag(NameLoc, diag::err_unknown_typename_suggest) 206 << Result.getLookupName() << CorrectedQuotedStr 207 << FixItHint::CreateReplacement(SourceRange(NameLoc), 208 CorrectedStr); 209 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl()) 210 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 211 << CorrectedQuotedStr; 212 213 if (SS && NNS) 214 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); 215 *CorrectedII = NewII; 216 return Ty; 217 } 218 } 219 } 220 // If typo correction failed or was not performed, fall through 221 case LookupResult::FoundOverloaded: 222 case LookupResult::FoundUnresolvedValue: 223 Result.suppressDiagnostics(); 224 return ParsedType(); 225 226 case LookupResult::Ambiguous: 227 // Recover from type-hiding ambiguities by hiding the type. We'll 228 // do the lookup again when looking for an object, and we can 229 // diagnose the error then. If we don't do this, then the error 230 // about hiding the type will be immediately followed by an error 231 // that only makes sense if the identifier was treated like a type. 232 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 233 Result.suppressDiagnostics(); 234 return ParsedType(); 235 } 236 237 // Look to see if we have a type anywhere in the list of results. 238 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 239 Res != ResEnd; ++Res) { 240 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 241 if (!IIDecl || 242 (*Res)->getLocation().getRawEncoding() < 243 IIDecl->getLocation().getRawEncoding()) 244 IIDecl = *Res; 245 } 246 } 247 248 if (!IIDecl) { 249 // None of the entities we found is a type, so there is no way 250 // to even assume that the result is a type. In this case, don't 251 // complain about the ambiguity. The parser will either try to 252 // perform this lookup again (e.g., as an object name), which 253 // will produce the ambiguity, or will complain that it expected 254 // a type name. 255 Result.suppressDiagnostics(); 256 return ParsedType(); 257 } 258 259 // We found a type within the ambiguous lookup; diagnose the 260 // ambiguity and then return that type. This might be the right 261 // answer, or it might not be, but it suppresses any attempt to 262 // perform the name lookup again. 263 break; 264 265 case LookupResult::Found: 266 IIDecl = Result.getFoundDecl(); 267 break; 268 } 269 270 assert(IIDecl && "Didn't find decl"); 271 272 QualType T; 273 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 274 DiagnoseUseOfDecl(IIDecl, NameLoc); 275 276 if (T.isNull()) 277 T = Context.getTypeDeclType(TD); 278 279 // NOTE: avoid constructing an ElaboratedType(Loc) if this is a 280 // constructor or destructor name (in such a case, the scope specifier 281 // will be attached to the enclosing Expr or Decl node). 282 if (SS && SS->isNotEmpty() && !IsCtorOrDtorName) { 283 if (WantNontrivialTypeSourceInfo) { 284 // Construct a type with type-source information. 285 TypeLocBuilder Builder; 286 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 287 288 T = getElaboratedType(ETK_None, *SS, T); 289 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 290 ElabTL.setElaboratedKeywordLoc(SourceLocation()); 291 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 292 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 293 } else { 294 T = getElaboratedType(ETK_None, *SS, T); 295 } 296 } 297 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 298 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 299 if (!HasTrailingDot) 300 T = Context.getObjCInterfaceType(IDecl); 301 } 302 303 if (T.isNull()) { 304 // If it's not plausibly a type, suppress diagnostics. 305 Result.suppressDiagnostics(); 306 return ParsedType(); 307 } 308 return ParsedType::make(T); 309} 310 311/// isTagName() - This method is called *for error recovery purposes only* 312/// to determine if the specified name is a valid tag name ("struct foo"). If 313/// so, this returns the TST for the tag corresponding to it (TST_enum, 314/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 315/// where the user forgot to specify the tag. 316DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 317 // Do a tag name lookup in this scope. 318 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 319 LookupName(R, S, false); 320 R.suppressDiagnostics(); 321 if (R.getResultKind() == LookupResult::Found) 322 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 323 switch (TD->getTagKind()) { 324 case TTK_Struct: return DeclSpec::TST_struct; 325 case TTK_Union: return DeclSpec::TST_union; 326 case TTK_Class: return DeclSpec::TST_class; 327 case TTK_Enum: return DeclSpec::TST_enum; 328 } 329 } 330 331 return DeclSpec::TST_unspecified; 332} 333 334/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 335/// if a CXXScopeSpec's type is equal to the type of one of the base classes 336/// then downgrade the missing typename error to a warning. 337/// This is needed for MSVC compatibility; Example: 338/// @code 339/// template<class T> class A { 340/// public: 341/// typedef int TYPE; 342/// }; 343/// template<class T> class B : public A<T> { 344/// public: 345/// A<T>::TYPE a; // no typename required because A<T> is a base class. 346/// }; 347/// @endcode 348bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 349 if (CurContext->isRecord()) { 350 const Type *Ty = SS->getScopeRep()->getAsType(); 351 352 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 353 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 354 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 355 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 356 return true; 357 return S->isFunctionPrototypeScope(); 358 } 359 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 360} 361 362bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 363 SourceLocation IILoc, 364 Scope *S, 365 CXXScopeSpec *SS, 366 ParsedType &SuggestedType) { 367 // We don't have anything to suggest (yet). 368 SuggestedType = ParsedType(); 369 370 // There may have been a typo in the name of the type. Look up typo 371 // results, in case we have something that we can suggest. 372 TypeNameValidatorCCC Validator(false); 373 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 374 LookupOrdinaryName, S, SS, 375 Validator)) { 376 std::string CorrectedStr(Corrected.getAsString(getLangOpts())); 377 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts())); 378 379 if (Corrected.isKeyword()) { 380 // We corrected to a keyword. 381 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 382 Diag(IILoc, diag::err_unknown_typename_suggest) 383 << &II << CorrectedQuotedStr; 384 } else { 385 NamedDecl *Result = Corrected.getCorrectionDecl(); 386 // We found a similarly-named type or interface; suggest that. 387 if (!SS || !SS->isSet()) 388 Diag(IILoc, diag::err_unknown_typename_suggest) 389 << &II << CorrectedQuotedStr 390 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 391 else if (DeclContext *DC = computeDeclContext(*SS, false)) 392 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 393 << &II << DC << CorrectedQuotedStr << SS->getRange() 394 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 395 else 396 llvm_unreachable("could not have corrected a typo here"); 397 398 Diag(Result->getLocation(), diag::note_previous_decl) 399 << CorrectedQuotedStr; 400 401 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 402 false, false, ParsedType(), 403 /*IsCtorOrDtorName=*/false, 404 /*NonTrivialTypeSourceInfo=*/true); 405 } 406 return true; 407 } 408 409 if (getLangOpts().CPlusPlus) { 410 // See if II is a class template that the user forgot to pass arguments to. 411 UnqualifiedId Name; 412 Name.setIdentifier(&II, IILoc); 413 CXXScopeSpec EmptySS; 414 TemplateTy TemplateResult; 415 bool MemberOfUnknownSpecialization; 416 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 417 Name, ParsedType(), true, TemplateResult, 418 MemberOfUnknownSpecialization) == TNK_Type_template) { 419 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 420 Diag(IILoc, diag::err_template_missing_args) << TplName; 421 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 422 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 423 << TplDecl->getTemplateParameters()->getSourceRange(); 424 } 425 return true; 426 } 427 } 428 429 // FIXME: Should we move the logic that tries to recover from a missing tag 430 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 431 432 if (!SS || (!SS->isSet() && !SS->isInvalid())) 433 Diag(IILoc, diag::err_unknown_typename) << &II; 434 else if (DeclContext *DC = computeDeclContext(*SS, false)) 435 Diag(IILoc, diag::err_typename_nested_not_found) 436 << &II << DC << SS->getRange(); 437 else if (isDependentScopeSpecifier(*SS)) { 438 unsigned DiagID = diag::err_typename_missing; 439 if (getLangOpts().MicrosoftMode && isMicrosoftMissingTypename(SS, S)) 440 DiagID = diag::warn_typename_missing; 441 442 Diag(SS->getRange().getBegin(), DiagID) 443 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 444 << SourceRange(SS->getRange().getBegin(), IILoc) 445 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 446 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc) 447 .get(); 448 } else { 449 assert(SS && SS->isInvalid() && 450 "Invalid scope specifier has already been diagnosed"); 451 } 452 453 return true; 454} 455 456/// \brief Determine whether the given result set contains either a type name 457/// or 458static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 459 bool CheckTemplate = R.getSema().getLangOpts().CPlusPlus && 460 NextToken.is(tok::less); 461 462 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 463 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 464 return true; 465 466 if (CheckTemplate && isa<TemplateDecl>(*I)) 467 return true; 468 } 469 470 return false; 471} 472 473Sema::NameClassification Sema::ClassifyName(Scope *S, 474 CXXScopeSpec &SS, 475 IdentifierInfo *&Name, 476 SourceLocation NameLoc, 477 const Token &NextToken) { 478 DeclarationNameInfo NameInfo(Name, NameLoc); 479 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 480 481 if (NextToken.is(tok::coloncolon)) { 482 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 483 QualType(), false, SS, 0, false); 484 485 } 486 487 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 488 LookupParsedName(Result, S, &SS, !CurMethod); 489 490 // Perform lookup for Objective-C instance variables (including automatically 491 // synthesized instance variables), if we're in an Objective-C method. 492 // FIXME: This lookup really, really needs to be folded in to the normal 493 // unqualified lookup mechanism. 494 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 495 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 496 if (E.get() || E.isInvalid()) 497 return E; 498 } 499 500 bool SecondTry = false; 501 bool IsFilteredTemplateName = false; 502 503Corrected: 504 switch (Result.getResultKind()) { 505 case LookupResult::NotFound: 506 // If an unqualified-id is followed by a '(', then we have a function 507 // call. 508 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 509 // In C++, this is an ADL-only call. 510 // FIXME: Reference? 511 if (getLangOpts().CPlusPlus) 512 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 513 514 // C90 6.3.2.2: 515 // If the expression that precedes the parenthesized argument list in a 516 // function call consists solely of an identifier, and if no 517 // declaration is visible for this identifier, the identifier is 518 // implicitly declared exactly as if, in the innermost block containing 519 // the function call, the declaration 520 // 521 // extern int identifier (); 522 // 523 // appeared. 524 // 525 // We also allow this in C99 as an extension. 526 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 527 Result.addDecl(D); 528 Result.resolveKind(); 529 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 530 } 531 } 532 533 // In C, we first see whether there is a tag type by the same name, in 534 // which case it's likely that the user just forget to write "enum", 535 // "struct", or "union". 536 if (!getLangOpts().CPlusPlus && !SecondTry) { 537 Result.clear(LookupTagName); 538 LookupParsedName(Result, S, &SS); 539 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 540 const char *TagName = 0; 541 const char *FixItTagName = 0; 542 switch (Tag->getTagKind()) { 543 case TTK_Class: 544 TagName = "class"; 545 FixItTagName = "class "; 546 break; 547 548 case TTK_Enum: 549 TagName = "enum"; 550 FixItTagName = "enum "; 551 break; 552 553 case TTK_Struct: 554 TagName = "struct"; 555 FixItTagName = "struct "; 556 break; 557 558 case TTK_Union: 559 TagName = "union"; 560 FixItTagName = "union "; 561 break; 562 } 563 564 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 565 << Name << TagName << getLangOpts().CPlusPlus 566 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 567 break; 568 } 569 570 Result.clear(LookupOrdinaryName); 571 } 572 573 // Perform typo correction to determine if there is another name that is 574 // close to this name. 575 if (!SecondTry) { 576 SecondTry = true; 577 CorrectionCandidateCallback DefaultValidator; 578 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 579 Result.getLookupKind(), S, 580 &SS, DefaultValidator)) { 581 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 582 unsigned QualifiedDiag = diag::err_no_member_suggest; 583 std::string CorrectedStr(Corrected.getAsString(getLangOpts())); 584 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts())); 585 586 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 587 NamedDecl *UnderlyingFirstDecl 588 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 589 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 590 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 591 UnqualifiedDiag = diag::err_no_template_suggest; 592 QualifiedDiag = diag::err_no_member_template_suggest; 593 } else if (UnderlyingFirstDecl && 594 (isa<TypeDecl>(UnderlyingFirstDecl) || 595 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 596 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 597 UnqualifiedDiag = diag::err_unknown_typename_suggest; 598 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 599 } 600 601 if (SS.isEmpty()) 602 Diag(NameLoc, UnqualifiedDiag) 603 << Name << CorrectedQuotedStr 604 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 605 else 606 Diag(NameLoc, QualifiedDiag) 607 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 608 << SS.getRange() 609 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 610 611 // Update the name, so that the caller has the new name. 612 Name = Corrected.getCorrectionAsIdentifierInfo(); 613 614 // Typo correction corrected to a keyword. 615 if (Corrected.isKeyword()) 616 return Corrected.getCorrectionAsIdentifierInfo(); 617 618 // Also update the LookupResult... 619 // FIXME: This should probably go away at some point 620 Result.clear(); 621 Result.setLookupName(Corrected.getCorrection()); 622 if (FirstDecl) { 623 Result.addDecl(FirstDecl); 624 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 625 << CorrectedQuotedStr; 626 } 627 628 // If we found an Objective-C instance variable, let 629 // LookupInObjCMethod build the appropriate expression to 630 // reference the ivar. 631 // FIXME: This is a gross hack. 632 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 633 Result.clear(); 634 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 635 return move(E); 636 } 637 638 goto Corrected; 639 } 640 } 641 642 // We failed to correct; just fall through and let the parser deal with it. 643 Result.suppressDiagnostics(); 644 return NameClassification::Unknown(); 645 646 case LookupResult::NotFoundInCurrentInstantiation: { 647 // We performed name lookup into the current instantiation, and there were 648 // dependent bases, so we treat this result the same way as any other 649 // dependent nested-name-specifier. 650 651 // C++ [temp.res]p2: 652 // A name used in a template declaration or definition and that is 653 // dependent on a template-parameter is assumed not to name a type 654 // unless the applicable name lookup finds a type name or the name is 655 // qualified by the keyword typename. 656 // 657 // FIXME: If the next token is '<', we might want to ask the parser to 658 // perform some heroics to see if we actually have a 659 // template-argument-list, which would indicate a missing 'template' 660 // keyword here. 661 return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(), 662 NameInfo, /*TemplateArgs=*/0); 663 } 664 665 case LookupResult::Found: 666 case LookupResult::FoundOverloaded: 667 case LookupResult::FoundUnresolvedValue: 668 break; 669 670 case LookupResult::Ambiguous: 671 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 672 hasAnyAcceptableTemplateNames(Result)) { 673 // C++ [temp.local]p3: 674 // A lookup that finds an injected-class-name (10.2) can result in an 675 // ambiguity in certain cases (for example, if it is found in more than 676 // one base class). If all of the injected-class-names that are found 677 // refer to specializations of the same class template, and if the name 678 // is followed by a template-argument-list, the reference refers to the 679 // class template itself and not a specialization thereof, and is not 680 // ambiguous. 681 // 682 // This filtering can make an ambiguous result into an unambiguous one, 683 // so try again after filtering out template names. 684 FilterAcceptableTemplateNames(Result); 685 if (!Result.isAmbiguous()) { 686 IsFilteredTemplateName = true; 687 break; 688 } 689 } 690 691 // Diagnose the ambiguity and return an error. 692 return NameClassification::Error(); 693 } 694 695 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) && 696 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 697 // C++ [temp.names]p3: 698 // After name lookup (3.4) finds that a name is a template-name or that 699 // an operator-function-id or a literal- operator-id refers to a set of 700 // overloaded functions any member of which is a function template if 701 // this is followed by a <, the < is always taken as the delimiter of a 702 // template-argument-list and never as the less-than operator. 703 if (!IsFilteredTemplateName) 704 FilterAcceptableTemplateNames(Result); 705 706 if (!Result.empty()) { 707 bool IsFunctionTemplate; 708 TemplateName Template; 709 if (Result.end() - Result.begin() > 1) { 710 IsFunctionTemplate = true; 711 Template = Context.getOverloadedTemplateName(Result.begin(), 712 Result.end()); 713 } else { 714 TemplateDecl *TD 715 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 716 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 717 718 if (SS.isSet() && !SS.isInvalid()) 719 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 720 /*TemplateKeyword=*/false, 721 TD); 722 else 723 Template = TemplateName(TD); 724 } 725 726 if (IsFunctionTemplate) { 727 // Function templates always go through overload resolution, at which 728 // point we'll perform the various checks (e.g., accessibility) we need 729 // to based on which function we selected. 730 Result.suppressDiagnostics(); 731 732 return NameClassification::FunctionTemplate(Template); 733 } 734 735 return NameClassification::TypeTemplate(Template); 736 } 737 } 738 739 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 740 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 741 DiagnoseUseOfDecl(Type, NameLoc); 742 QualType T = Context.getTypeDeclType(Type); 743 return ParsedType::make(T); 744 } 745 746 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 747 if (!Class) { 748 // FIXME: It's unfortunate that we don't have a Type node for handling this. 749 if (ObjCCompatibleAliasDecl *Alias 750 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 751 Class = Alias->getClassInterface(); 752 } 753 754 if (Class) { 755 DiagnoseUseOfDecl(Class, NameLoc); 756 757 if (NextToken.is(tok::period)) { 758 // Interface. <something> is parsed as a property reference expression. 759 // Just return "unknown" as a fall-through for now. 760 Result.suppressDiagnostics(); 761 return NameClassification::Unknown(); 762 } 763 764 QualType T = Context.getObjCInterfaceType(Class); 765 return ParsedType::make(T); 766 } 767 768 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 769 return BuildPossibleImplicitMemberExpr(SS, SourceLocation(), Result, 0); 770 771 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 772 return BuildDeclarationNameExpr(SS, Result, ADL); 773} 774 775// Determines the context to return to after temporarily entering a 776// context. This depends in an unnecessarily complicated way on the 777// exact ordering of callbacks from the parser. 778DeclContext *Sema::getContainingDC(DeclContext *DC) { 779 780 // Functions defined inline within classes aren't parsed until we've 781 // finished parsing the top-level class, so the top-level class is 782 // the context we'll need to return to. 783 if (isa<FunctionDecl>(DC)) { 784 DC = DC->getLexicalParent(); 785 786 // A function not defined within a class will always return to its 787 // lexical context. 788 if (!isa<CXXRecordDecl>(DC)) 789 return DC; 790 791 // A C++ inline method/friend is parsed *after* the topmost class 792 // it was declared in is fully parsed ("complete"); the topmost 793 // class is the context we need to return to. 794 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 795 DC = RD; 796 797 // Return the declaration context of the topmost class the inline method is 798 // declared in. 799 return DC; 800 } 801 802 return DC->getLexicalParent(); 803} 804 805void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 806 assert(getContainingDC(DC) == CurContext && 807 "The next DeclContext should be lexically contained in the current one."); 808 CurContext = DC; 809 S->setEntity(DC); 810} 811 812void Sema::PopDeclContext() { 813 assert(CurContext && "DeclContext imbalance!"); 814 815 CurContext = getContainingDC(CurContext); 816 assert(CurContext && "Popped translation unit!"); 817} 818 819/// EnterDeclaratorContext - Used when we must lookup names in the context 820/// of a declarator's nested name specifier. 821/// 822void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 823 // C++0x [basic.lookup.unqual]p13: 824 // A name used in the definition of a static data member of class 825 // X (after the qualified-id of the static member) is looked up as 826 // if the name was used in a member function of X. 827 // C++0x [basic.lookup.unqual]p14: 828 // If a variable member of a namespace is defined outside of the 829 // scope of its namespace then any name used in the definition of 830 // the variable member (after the declarator-id) is looked up as 831 // if the definition of the variable member occurred in its 832 // namespace. 833 // Both of these imply that we should push a scope whose context 834 // is the semantic context of the declaration. We can't use 835 // PushDeclContext here because that context is not necessarily 836 // lexically contained in the current context. Fortunately, 837 // the containing scope should have the appropriate information. 838 839 assert(!S->getEntity() && "scope already has entity"); 840 841#ifndef NDEBUG 842 Scope *Ancestor = S->getParent(); 843 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 844 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 845#endif 846 847 CurContext = DC; 848 S->setEntity(DC); 849} 850 851void Sema::ExitDeclaratorContext(Scope *S) { 852 assert(S->getEntity() == CurContext && "Context imbalance!"); 853 854 // Switch back to the lexical context. The safety of this is 855 // enforced by an assert in EnterDeclaratorContext. 856 Scope *Ancestor = S->getParent(); 857 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 858 CurContext = (DeclContext*) Ancestor->getEntity(); 859 860 // We don't need to do anything with the scope, which is going to 861 // disappear. 862} 863 864 865void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 866 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 867 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 868 // We assume that the caller has already called 869 // ActOnReenterTemplateScope 870 FD = TFD->getTemplatedDecl(); 871 } 872 if (!FD) 873 return; 874 875 PushDeclContext(S, FD); 876 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 877 ParmVarDecl *Param = FD->getParamDecl(P); 878 // If the parameter has an identifier, then add it to the scope 879 if (Param->getIdentifier()) { 880 S->AddDecl(Param); 881 IdResolver.AddDecl(Param); 882 } 883 } 884} 885 886 887/// \brief Determine whether we allow overloading of the function 888/// PrevDecl with another declaration. 889/// 890/// This routine determines whether overloading is possible, not 891/// whether some new function is actually an overload. It will return 892/// true in C++ (where we can always provide overloads) or, as an 893/// extension, in C when the previous function is already an 894/// overloaded function declaration or has the "overloadable" 895/// attribute. 896static bool AllowOverloadingOfFunction(LookupResult &Previous, 897 ASTContext &Context) { 898 if (Context.getLangOpts().CPlusPlus) 899 return true; 900 901 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 902 return true; 903 904 return (Previous.getResultKind() == LookupResult::Found 905 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 906} 907 908/// Add this decl to the scope shadowed decl chains. 909void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 910 // Move up the scope chain until we find the nearest enclosing 911 // non-transparent context. The declaration will be introduced into this 912 // scope. 913 while (S->getEntity() && 914 ((DeclContext *)S->getEntity())->isTransparentContext()) 915 S = S->getParent(); 916 917 // Add scoped declarations into their context, so that they can be 918 // found later. Declarations without a context won't be inserted 919 // into any context. 920 if (AddToContext) 921 CurContext->addDecl(D); 922 923 // Out-of-line definitions shouldn't be pushed into scope in C++. 924 // Out-of-line variable and function definitions shouldn't even in C. 925 if ((getLangOpts().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 926 D->isOutOfLine() && 927 !D->getDeclContext()->getRedeclContext()->Equals( 928 D->getLexicalDeclContext()->getRedeclContext())) 929 return; 930 931 // Template instantiations should also not be pushed into scope. 932 if (isa<FunctionDecl>(D) && 933 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 934 return; 935 936 // If this replaces anything in the current scope, 937 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 938 IEnd = IdResolver.end(); 939 for (; I != IEnd; ++I) { 940 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 941 S->RemoveDecl(*I); 942 IdResolver.RemoveDecl(*I); 943 944 // Should only need to replace one decl. 945 break; 946 } 947 } 948 949 S->AddDecl(D); 950 951 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 952 // Implicitly-generated labels may end up getting generated in an order that 953 // isn't strictly lexical, which breaks name lookup. Be careful to insert 954 // the label at the appropriate place in the identifier chain. 955 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 956 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 957 if (IDC == CurContext) { 958 if (!S->isDeclScope(*I)) 959 continue; 960 } else if (IDC->Encloses(CurContext)) 961 break; 962 } 963 964 IdResolver.InsertDeclAfter(I, D); 965 } else { 966 IdResolver.AddDecl(D); 967 } 968} 969 970void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) { 971 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope) 972 TUScope->AddDecl(D); 973} 974 975bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 976 bool ExplicitInstantiationOrSpecialization) { 977 return IdResolver.isDeclInScope(D, Ctx, Context, S, 978 ExplicitInstantiationOrSpecialization); 979} 980 981Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 982 DeclContext *TargetDC = DC->getPrimaryContext(); 983 do { 984 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 985 if (ScopeDC->getPrimaryContext() == TargetDC) 986 return S; 987 } while ((S = S->getParent())); 988 989 return 0; 990} 991 992static bool isOutOfScopePreviousDeclaration(NamedDecl *, 993 DeclContext*, 994 ASTContext&); 995 996/// Filters out lookup results that don't fall within the given scope 997/// as determined by isDeclInScope. 998void Sema::FilterLookupForScope(LookupResult &R, 999 DeclContext *Ctx, Scope *S, 1000 bool ConsiderLinkage, 1001 bool ExplicitInstantiationOrSpecialization) { 1002 LookupResult::Filter F = R.makeFilter(); 1003 while (F.hasNext()) { 1004 NamedDecl *D = F.next(); 1005 1006 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 1007 continue; 1008 1009 if (ConsiderLinkage && 1010 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 1011 continue; 1012 1013 F.erase(); 1014 } 1015 1016 F.done(); 1017} 1018 1019static bool isUsingDecl(NamedDecl *D) { 1020 return isa<UsingShadowDecl>(D) || 1021 isa<UnresolvedUsingTypenameDecl>(D) || 1022 isa<UnresolvedUsingValueDecl>(D); 1023} 1024 1025/// Removes using shadow declarations from the lookup results. 1026static void RemoveUsingDecls(LookupResult &R) { 1027 LookupResult::Filter F = R.makeFilter(); 1028 while (F.hasNext()) 1029 if (isUsingDecl(F.next())) 1030 F.erase(); 1031 1032 F.done(); 1033} 1034 1035/// \brief Check for this common pattern: 1036/// @code 1037/// class S { 1038/// S(const S&); // DO NOT IMPLEMENT 1039/// void operator=(const S&); // DO NOT IMPLEMENT 1040/// }; 1041/// @endcode 1042static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1043 // FIXME: Should check for private access too but access is set after we get 1044 // the decl here. 1045 if (D->doesThisDeclarationHaveABody()) 1046 return false; 1047 1048 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1049 return CD->isCopyConstructor(); 1050 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1051 return Method->isCopyAssignmentOperator(); 1052 return false; 1053} 1054 1055bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1056 assert(D); 1057 1058 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1059 return false; 1060 1061 // Ignore class templates. 1062 if (D->getDeclContext()->isDependentContext() || 1063 D->getLexicalDeclContext()->isDependentContext()) 1064 return false; 1065 1066 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1067 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1068 return false; 1069 1070 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1071 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1072 return false; 1073 } else { 1074 // 'static inline' functions are used in headers; don't warn. 1075 if (FD->getStorageClass() == SC_Static && 1076 FD->isInlineSpecified()) 1077 return false; 1078 } 1079 1080 if (FD->doesThisDeclarationHaveABody() && 1081 Context.DeclMustBeEmitted(FD)) 1082 return false; 1083 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1084 if (!VD->isFileVarDecl() || 1085 VD->getType().isConstant(Context) || 1086 Context.DeclMustBeEmitted(VD)) 1087 return false; 1088 1089 if (VD->isStaticDataMember() && 1090 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1091 return false; 1092 1093 } else { 1094 return false; 1095 } 1096 1097 // Only warn for unused decls internal to the translation unit. 1098 if (D->getLinkage() == ExternalLinkage) 1099 return false; 1100 1101 return true; 1102} 1103 1104void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1105 if (!D) 1106 return; 1107 1108 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1109 const FunctionDecl *First = FD->getFirstDeclaration(); 1110 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1111 return; // First should already be in the vector. 1112 } 1113 1114 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1115 const VarDecl *First = VD->getFirstDeclaration(); 1116 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1117 return; // First should already be in the vector. 1118 } 1119 1120 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1121 UnusedFileScopedDecls.push_back(D); 1122 } 1123 1124static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1125 if (D->isInvalidDecl()) 1126 return false; 1127 1128 if (D->isReferenced() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1129 return false; 1130 1131 if (isa<LabelDecl>(D)) 1132 return true; 1133 1134 // White-list anything that isn't a local variable. 1135 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1136 !D->getDeclContext()->isFunctionOrMethod()) 1137 return false; 1138 1139 // Types of valid local variables should be complete, so this should succeed. 1140 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1141 1142 // White-list anything with an __attribute__((unused)) type. 1143 QualType Ty = VD->getType(); 1144 1145 // Only look at the outermost level of typedef. 1146 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1147 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1148 return false; 1149 } 1150 1151 // If we failed to complete the type for some reason, or if the type is 1152 // dependent, don't diagnose the variable. 1153 if (Ty->isIncompleteType() || Ty->isDependentType()) 1154 return false; 1155 1156 if (const TagType *TT = Ty->getAs<TagType>()) { 1157 const TagDecl *Tag = TT->getDecl(); 1158 if (Tag->hasAttr<UnusedAttr>()) 1159 return false; 1160 1161 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1162 if (!RD->hasTrivialDestructor()) 1163 return false; 1164 1165 if (const Expr *Init = VD->getInit()) { 1166 const CXXConstructExpr *Construct = 1167 dyn_cast<CXXConstructExpr>(Init); 1168 if (Construct && !Construct->isElidable()) { 1169 CXXConstructorDecl *CD = Construct->getConstructor(); 1170 if (!CD->isTrivial()) 1171 return false; 1172 } 1173 } 1174 } 1175 } 1176 1177 // TODO: __attribute__((unused)) templates? 1178 } 1179 1180 return true; 1181} 1182 1183static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1184 FixItHint &Hint) { 1185 if (isa<LabelDecl>(D)) { 1186 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1187 tok::colon, Ctx.getSourceManager(), Ctx.getLangOpts(), true); 1188 if (AfterColon.isInvalid()) 1189 return; 1190 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1191 getCharRange(D->getLocStart(), AfterColon)); 1192 } 1193 return; 1194} 1195 1196/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1197/// unless they are marked attr(unused). 1198void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1199 FixItHint Hint; 1200 if (!ShouldDiagnoseUnusedDecl(D)) 1201 return; 1202 1203 GenerateFixForUnusedDecl(D, Context, Hint); 1204 1205 unsigned DiagID; 1206 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1207 DiagID = diag::warn_unused_exception_param; 1208 else if (isa<LabelDecl>(D)) 1209 DiagID = diag::warn_unused_label; 1210 else 1211 DiagID = diag::warn_unused_variable; 1212 1213 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1214} 1215 1216static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1217 // Verify that we have no forward references left. If so, there was a goto 1218 // or address of a label taken, but no definition of it. Label fwd 1219 // definitions are indicated with a null substmt. 1220 if (L->getStmt() == 0) 1221 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1222} 1223 1224void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1225 if (S->decl_empty()) return; 1226 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1227 "Scope shouldn't contain decls!"); 1228 1229 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1230 I != E; ++I) { 1231 Decl *TmpD = (*I); 1232 assert(TmpD && "This decl didn't get pushed??"); 1233 1234 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1235 NamedDecl *D = cast<NamedDecl>(TmpD); 1236 1237 if (!D->getDeclName()) continue; 1238 1239 // Diagnose unused variables in this scope. 1240 if (!S->hasErrorOccurred()) 1241 DiagnoseUnusedDecl(D); 1242 1243 // If this was a forward reference to a label, verify it was defined. 1244 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1245 CheckPoppedLabel(LD, *this); 1246 1247 // Remove this name from our lexical scope. 1248 IdResolver.RemoveDecl(D); 1249 } 1250} 1251 1252void Sema::ActOnStartFunctionDeclarator() { 1253 ++InFunctionDeclarator; 1254} 1255 1256void Sema::ActOnEndFunctionDeclarator() { 1257 assert(InFunctionDeclarator); 1258 --InFunctionDeclarator; 1259} 1260 1261/// \brief Look for an Objective-C class in the translation unit. 1262/// 1263/// \param Id The name of the Objective-C class we're looking for. If 1264/// typo-correction fixes this name, the Id will be updated 1265/// to the fixed name. 1266/// 1267/// \param IdLoc The location of the name in the translation unit. 1268/// 1269/// \param TypoCorrection If true, this routine will attempt typo correction 1270/// if there is no class with the given name. 1271/// 1272/// \returns The declaration of the named Objective-C class, or NULL if the 1273/// class could not be found. 1274ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1275 SourceLocation IdLoc, 1276 bool DoTypoCorrection) { 1277 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1278 // creation from this context. 1279 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1280 1281 if (!IDecl && DoTypoCorrection) { 1282 // Perform typo correction at the given location, but only if we 1283 // find an Objective-C class name. 1284 DeclFilterCCC<ObjCInterfaceDecl> Validator; 1285 if (TypoCorrection C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), 1286 LookupOrdinaryName, TUScope, NULL, 1287 Validator)) { 1288 IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>(); 1289 Diag(IdLoc, diag::err_undef_interface_suggest) 1290 << Id << IDecl->getDeclName() 1291 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1292 Diag(IDecl->getLocation(), diag::note_previous_decl) 1293 << IDecl->getDeclName(); 1294 1295 Id = IDecl->getIdentifier(); 1296 } 1297 } 1298 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1299 // This routine must always return a class definition, if any. 1300 if (Def && Def->getDefinition()) 1301 Def = Def->getDefinition(); 1302 return Def; 1303} 1304 1305/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1306/// from S, where a non-field would be declared. This routine copes 1307/// with the difference between C and C++ scoping rules in structs and 1308/// unions. For example, the following code is well-formed in C but 1309/// ill-formed in C++: 1310/// @code 1311/// struct S6 { 1312/// enum { BAR } e; 1313/// }; 1314/// 1315/// void test_S6() { 1316/// struct S6 a; 1317/// a.e = BAR; 1318/// } 1319/// @endcode 1320/// For the declaration of BAR, this routine will return a different 1321/// scope. The scope S will be the scope of the unnamed enumeration 1322/// within S6. In C++, this routine will return the scope associated 1323/// with S6, because the enumeration's scope is a transparent 1324/// context but structures can contain non-field names. In C, this 1325/// routine will return the translation unit scope, since the 1326/// enumeration's scope is a transparent context and structures cannot 1327/// contain non-field names. 1328Scope *Sema::getNonFieldDeclScope(Scope *S) { 1329 while (((S->getFlags() & Scope::DeclScope) == 0) || 1330 (S->getEntity() && 1331 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1332 (S->isClassScope() && !getLangOpts().CPlusPlus)) 1333 S = S->getParent(); 1334 return S; 1335} 1336 1337/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1338/// file scope. lazily create a decl for it. ForRedeclaration is true 1339/// if we're creating this built-in in anticipation of redeclaring the 1340/// built-in. 1341NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1342 Scope *S, bool ForRedeclaration, 1343 SourceLocation Loc) { 1344 Builtin::ID BID = (Builtin::ID)bid; 1345 1346 ASTContext::GetBuiltinTypeError Error; 1347 QualType R = Context.GetBuiltinType(BID, Error); 1348 switch (Error) { 1349 case ASTContext::GE_None: 1350 // Okay 1351 break; 1352 1353 case ASTContext::GE_Missing_stdio: 1354 if (ForRedeclaration) 1355 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1356 << Context.BuiltinInfo.GetName(BID); 1357 return 0; 1358 1359 case ASTContext::GE_Missing_setjmp: 1360 if (ForRedeclaration) 1361 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1362 << Context.BuiltinInfo.GetName(BID); 1363 return 0; 1364 1365 case ASTContext::GE_Missing_ucontext: 1366 if (ForRedeclaration) 1367 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1368 << Context.BuiltinInfo.GetName(BID); 1369 return 0; 1370 } 1371 1372 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1373 Diag(Loc, diag::ext_implicit_lib_function_decl) 1374 << Context.BuiltinInfo.GetName(BID) 1375 << R; 1376 if (Context.BuiltinInfo.getHeaderName(BID) && 1377 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1378 != DiagnosticsEngine::Ignored) 1379 Diag(Loc, diag::note_please_include_header) 1380 << Context.BuiltinInfo.getHeaderName(BID) 1381 << Context.BuiltinInfo.GetName(BID); 1382 } 1383 1384 FunctionDecl *New = FunctionDecl::Create(Context, 1385 Context.getTranslationUnitDecl(), 1386 Loc, Loc, II, R, /*TInfo=*/0, 1387 SC_Extern, 1388 SC_None, false, 1389 /*hasPrototype=*/true); 1390 New->setImplicit(); 1391 1392 // Create Decl objects for each parameter, adding them to the 1393 // FunctionDecl. 1394 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1395 SmallVector<ParmVarDecl*, 16> Params; 1396 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1397 ParmVarDecl *parm = 1398 ParmVarDecl::Create(Context, New, SourceLocation(), 1399 SourceLocation(), 0, 1400 FT->getArgType(i), /*TInfo=*/0, 1401 SC_None, SC_None, 0); 1402 parm->setScopeInfo(0, i); 1403 Params.push_back(parm); 1404 } 1405 New->setParams(Params); 1406 } 1407 1408 AddKnownFunctionAttributes(New); 1409 1410 // TUScope is the translation-unit scope to insert this function into. 1411 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1412 // relate Scopes to DeclContexts, and probably eliminate CurContext 1413 // entirely, but we're not there yet. 1414 DeclContext *SavedContext = CurContext; 1415 CurContext = Context.getTranslationUnitDecl(); 1416 PushOnScopeChains(New, TUScope); 1417 CurContext = SavedContext; 1418 return New; 1419} 1420 1421bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { 1422 QualType OldType; 1423 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1424 OldType = OldTypedef->getUnderlyingType(); 1425 else 1426 OldType = Context.getTypeDeclType(Old); 1427 QualType NewType = New->getUnderlyingType(); 1428 1429 if (NewType->isVariablyModifiedType()) { 1430 // Must not redefine a typedef with a variably-modified type. 1431 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1432 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef) 1433 << Kind << NewType; 1434 if (Old->getLocation().isValid()) 1435 Diag(Old->getLocation(), diag::note_previous_definition); 1436 New->setInvalidDecl(); 1437 return true; 1438 } 1439 1440 if (OldType != NewType && 1441 !OldType->isDependentType() && 1442 !NewType->isDependentType() && 1443 !Context.hasSameType(OldType, NewType)) { 1444 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1445 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1446 << Kind << NewType << OldType; 1447 if (Old->getLocation().isValid()) 1448 Diag(Old->getLocation(), diag::note_previous_definition); 1449 New->setInvalidDecl(); 1450 return true; 1451 } 1452 return false; 1453} 1454 1455/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1456/// same name and scope as a previous declaration 'Old'. Figure out 1457/// how to resolve this situation, merging decls or emitting 1458/// diagnostics as appropriate. If there was an error, set New to be invalid. 1459/// 1460void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1461 // If the new decl is known invalid already, don't bother doing any 1462 // merging checks. 1463 if (New->isInvalidDecl()) return; 1464 1465 // Allow multiple definitions for ObjC built-in typedefs. 1466 // FIXME: Verify the underlying types are equivalent! 1467 if (getLangOpts().ObjC1) { 1468 const IdentifierInfo *TypeID = New->getIdentifier(); 1469 switch (TypeID->getLength()) { 1470 default: break; 1471 case 2: 1472 if (!TypeID->isStr("id")) 1473 break; 1474 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1475 // Install the built-in type for 'id', ignoring the current definition. 1476 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1477 return; 1478 case 5: 1479 if (!TypeID->isStr("Class")) 1480 break; 1481 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1482 // Install the built-in type for 'Class', ignoring the current definition. 1483 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1484 return; 1485 case 3: 1486 if (!TypeID->isStr("SEL")) 1487 break; 1488 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1489 // Install the built-in type for 'SEL', ignoring the current definition. 1490 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1491 return; 1492 } 1493 // Fall through - the typedef name was not a builtin type. 1494 } 1495 1496 // Verify the old decl was also a type. 1497 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1498 if (!Old) { 1499 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1500 << New->getDeclName(); 1501 1502 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1503 if (OldD->getLocation().isValid()) 1504 Diag(OldD->getLocation(), diag::note_previous_definition); 1505 1506 return New->setInvalidDecl(); 1507 } 1508 1509 // If the old declaration is invalid, just give up here. 1510 if (Old->isInvalidDecl()) 1511 return New->setInvalidDecl(); 1512 1513 // If the typedef types are not identical, reject them in all languages and 1514 // with any extensions enabled. 1515 if (isIncompatibleTypedef(Old, New)) 1516 return; 1517 1518 // The types match. Link up the redeclaration chain if the old 1519 // declaration was a typedef. 1520 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1521 New->setPreviousDeclaration(Typedef); 1522 1523 if (getLangOpts().MicrosoftExt) 1524 return; 1525 1526 if (getLangOpts().CPlusPlus) { 1527 // C++ [dcl.typedef]p2: 1528 // In a given non-class scope, a typedef specifier can be used to 1529 // redefine the name of any type declared in that scope to refer 1530 // to the type to which it already refers. 1531 if (!isa<CXXRecordDecl>(CurContext)) 1532 return; 1533 1534 // C++0x [dcl.typedef]p4: 1535 // In a given class scope, a typedef specifier can be used to redefine 1536 // any class-name declared in that scope that is not also a typedef-name 1537 // to refer to the type to which it already refers. 1538 // 1539 // This wording came in via DR424, which was a correction to the 1540 // wording in DR56, which accidentally banned code like: 1541 // 1542 // struct S { 1543 // typedef struct A { } A; 1544 // }; 1545 // 1546 // in the C++03 standard. We implement the C++0x semantics, which 1547 // allow the above but disallow 1548 // 1549 // struct S { 1550 // typedef int I; 1551 // typedef int I; 1552 // }; 1553 // 1554 // since that was the intent of DR56. 1555 if (!isa<TypedefNameDecl>(Old)) 1556 return; 1557 1558 Diag(New->getLocation(), diag::err_redefinition) 1559 << New->getDeclName(); 1560 Diag(Old->getLocation(), diag::note_previous_definition); 1561 return New->setInvalidDecl(); 1562 } 1563 1564 // Modules always permit redefinition of typedefs, as does C11. 1565 if (getLangOpts().Modules || getLangOpts().C11) 1566 return; 1567 1568 // If we have a redefinition of a typedef in C, emit a warning. This warning 1569 // is normally mapped to an error, but can be controlled with 1570 // -Wtypedef-redefinition. If either the original or the redefinition is 1571 // in a system header, don't emit this for compatibility with GCC. 1572 if (getDiagnostics().getSuppressSystemWarnings() && 1573 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1574 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1575 return; 1576 1577 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1578 << New->getDeclName(); 1579 Diag(Old->getLocation(), diag::note_previous_definition); 1580 return; 1581} 1582 1583/// DeclhasAttr - returns true if decl Declaration already has the target 1584/// attribute. 1585static bool 1586DeclHasAttr(const Decl *D, const Attr *A) { 1587 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1588 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1589 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1590 if ((*i)->getKind() == A->getKind()) { 1591 if (Ann) { 1592 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1593 return true; 1594 continue; 1595 } 1596 // FIXME: Don't hardcode this check 1597 if (OA && isa<OwnershipAttr>(*i)) 1598 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1599 return true; 1600 } 1601 1602 return false; 1603} 1604 1605/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1606void Sema::mergeDeclAttributes(Decl *New, Decl *Old, 1607 bool MergeDeprecation) { 1608 if (!Old->hasAttrs()) 1609 return; 1610 1611 bool foundAny = New->hasAttrs(); 1612 1613 // Ensure that any moving of objects within the allocated map is done before 1614 // we process them. 1615 if (!foundAny) New->setAttrs(AttrVec()); 1616 1617 for (specific_attr_iterator<InheritableAttr> 1618 i = Old->specific_attr_begin<InheritableAttr>(), 1619 e = Old->specific_attr_end<InheritableAttr>(); 1620 i != e; ++i) { 1621 // Ignore deprecated/unavailable/availability attributes if requested. 1622 if (!MergeDeprecation && 1623 (isa<DeprecatedAttr>(*i) || 1624 isa<UnavailableAttr>(*i) || 1625 isa<AvailabilityAttr>(*i))) 1626 continue; 1627 1628 if (!DeclHasAttr(New, *i)) { 1629 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(Context)); 1630 newAttr->setInherited(true); 1631 New->addAttr(newAttr); 1632 foundAny = true; 1633 } 1634 } 1635 1636 if (!foundAny) New->dropAttrs(); 1637} 1638 1639/// mergeParamDeclAttributes - Copy attributes from the old parameter 1640/// to the new one. 1641static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1642 const ParmVarDecl *oldDecl, 1643 ASTContext &C) { 1644 if (!oldDecl->hasAttrs()) 1645 return; 1646 1647 bool foundAny = newDecl->hasAttrs(); 1648 1649 // Ensure that any moving of objects within the allocated map is 1650 // done before we process them. 1651 if (!foundAny) newDecl->setAttrs(AttrVec()); 1652 1653 for (specific_attr_iterator<InheritableParamAttr> 1654 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1655 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1656 if (!DeclHasAttr(newDecl, *i)) { 1657 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1658 newAttr->setInherited(true); 1659 newDecl->addAttr(newAttr); 1660 foundAny = true; 1661 } 1662 } 1663 1664 if (!foundAny) newDecl->dropAttrs(); 1665} 1666 1667namespace { 1668 1669/// Used in MergeFunctionDecl to keep track of function parameters in 1670/// C. 1671struct GNUCompatibleParamWarning { 1672 ParmVarDecl *OldParm; 1673 ParmVarDecl *NewParm; 1674 QualType PromotedType; 1675}; 1676 1677} 1678 1679/// getSpecialMember - get the special member enum for a method. 1680Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1681 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1682 if (Ctor->isDefaultConstructor()) 1683 return Sema::CXXDefaultConstructor; 1684 1685 if (Ctor->isCopyConstructor()) 1686 return Sema::CXXCopyConstructor; 1687 1688 if (Ctor->isMoveConstructor()) 1689 return Sema::CXXMoveConstructor; 1690 } else if (isa<CXXDestructorDecl>(MD)) { 1691 return Sema::CXXDestructor; 1692 } else if (MD->isCopyAssignmentOperator()) { 1693 return Sema::CXXCopyAssignment; 1694 } else if (MD->isMoveAssignmentOperator()) { 1695 return Sema::CXXMoveAssignment; 1696 } 1697 1698 return Sema::CXXInvalid; 1699} 1700 1701/// canRedefineFunction - checks if a function can be redefined. Currently, 1702/// only extern inline functions can be redefined, and even then only in 1703/// GNU89 mode. 1704static bool canRedefineFunction(const FunctionDecl *FD, 1705 const LangOptions& LangOpts) { 1706 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1707 !LangOpts.CPlusPlus && 1708 FD->isInlineSpecified() && 1709 FD->getStorageClass() == SC_Extern); 1710} 1711 1712/// MergeFunctionDecl - We just parsed a function 'New' from 1713/// declarator D which has the same name and scope as a previous 1714/// declaration 'Old'. Figure out how to resolve this situation, 1715/// merging decls or emitting diagnostics as appropriate. 1716/// 1717/// In C++, New and Old must be declarations that are not 1718/// overloaded. Use IsOverload to determine whether New and Old are 1719/// overloaded, and to select the Old declaration that New should be 1720/// merged with. 1721/// 1722/// Returns true if there was an error, false otherwise. 1723bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD, Scope *S) { 1724 // Verify the old decl was also a function. 1725 FunctionDecl *Old = 0; 1726 if (FunctionTemplateDecl *OldFunctionTemplate 1727 = dyn_cast<FunctionTemplateDecl>(OldD)) 1728 Old = OldFunctionTemplate->getTemplatedDecl(); 1729 else 1730 Old = dyn_cast<FunctionDecl>(OldD); 1731 if (!Old) { 1732 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1733 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1734 Diag(Shadow->getTargetDecl()->getLocation(), 1735 diag::note_using_decl_target); 1736 Diag(Shadow->getUsingDecl()->getLocation(), 1737 diag::note_using_decl) << 0; 1738 return true; 1739 } 1740 1741 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1742 << New->getDeclName(); 1743 Diag(OldD->getLocation(), diag::note_previous_definition); 1744 return true; 1745 } 1746 1747 // Determine whether the previous declaration was a definition, 1748 // implicit declaration, or a declaration. 1749 diag::kind PrevDiag; 1750 if (Old->isThisDeclarationADefinition()) 1751 PrevDiag = diag::note_previous_definition; 1752 else if (Old->isImplicit()) 1753 PrevDiag = diag::note_previous_implicit_declaration; 1754 else 1755 PrevDiag = diag::note_previous_declaration; 1756 1757 QualType OldQType = Context.getCanonicalType(Old->getType()); 1758 QualType NewQType = Context.getCanonicalType(New->getType()); 1759 1760 // Don't complain about this if we're in GNU89 mode and the old function 1761 // is an extern inline function. 1762 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1763 New->getStorageClass() == SC_Static && 1764 Old->getStorageClass() != SC_Static && 1765 !canRedefineFunction(Old, getLangOpts())) { 1766 if (getLangOpts().MicrosoftExt) { 1767 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1768 Diag(Old->getLocation(), PrevDiag); 1769 } else { 1770 Diag(New->getLocation(), diag::err_static_non_static) << New; 1771 Diag(Old->getLocation(), PrevDiag); 1772 return true; 1773 } 1774 } 1775 1776 // If a function is first declared with a calling convention, but is 1777 // later declared or defined without one, the second decl assumes the 1778 // calling convention of the first. 1779 // 1780 // For the new decl, we have to look at the NON-canonical type to tell the 1781 // difference between a function that really doesn't have a calling 1782 // convention and one that is declared cdecl. That's because in 1783 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1784 // because it is the default calling convention. 1785 // 1786 // Note also that we DO NOT return at this point, because we still have 1787 // other tests to run. 1788 const FunctionType *OldType = cast<FunctionType>(OldQType); 1789 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1790 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1791 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1792 bool RequiresAdjustment = false; 1793 if (OldTypeInfo.getCC() != CC_Default && 1794 NewTypeInfo.getCC() == CC_Default) { 1795 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1796 RequiresAdjustment = true; 1797 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1798 NewTypeInfo.getCC())) { 1799 // Calling conventions really aren't compatible, so complain. 1800 Diag(New->getLocation(), diag::err_cconv_change) 1801 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1802 << (OldTypeInfo.getCC() == CC_Default) 1803 << (OldTypeInfo.getCC() == CC_Default ? "" : 1804 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1805 Diag(Old->getLocation(), diag::note_previous_declaration); 1806 return true; 1807 } 1808 1809 // FIXME: diagnose the other way around? 1810 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1811 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1812 RequiresAdjustment = true; 1813 } 1814 1815 // Merge regparm attribute. 1816 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1817 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1818 if (NewTypeInfo.getHasRegParm()) { 1819 Diag(New->getLocation(), diag::err_regparm_mismatch) 1820 << NewType->getRegParmType() 1821 << OldType->getRegParmType(); 1822 Diag(Old->getLocation(), diag::note_previous_declaration); 1823 return true; 1824 } 1825 1826 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1827 RequiresAdjustment = true; 1828 } 1829 1830 // Merge ns_returns_retained attribute. 1831 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1832 if (NewTypeInfo.getProducesResult()) { 1833 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1834 Diag(Old->getLocation(), diag::note_previous_declaration); 1835 return true; 1836 } 1837 1838 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1839 RequiresAdjustment = true; 1840 } 1841 1842 if (RequiresAdjustment) { 1843 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1844 New->setType(QualType(NewType, 0)); 1845 NewQType = Context.getCanonicalType(New->getType()); 1846 } 1847 1848 if (getLangOpts().CPlusPlus) { 1849 // (C++98 13.1p2): 1850 // Certain function declarations cannot be overloaded: 1851 // -- Function declarations that differ only in the return type 1852 // cannot be overloaded. 1853 QualType OldReturnType = OldType->getResultType(); 1854 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1855 QualType ResQT; 1856 if (OldReturnType != NewReturnType) { 1857 if (NewReturnType->isObjCObjectPointerType() 1858 && OldReturnType->isObjCObjectPointerType()) 1859 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1860 if (ResQT.isNull()) { 1861 if (New->isCXXClassMember() && New->isOutOfLine()) 1862 Diag(New->getLocation(), 1863 diag::err_member_def_does_not_match_ret_type) << New; 1864 else 1865 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1866 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1867 return true; 1868 } 1869 else 1870 NewQType = ResQT; 1871 } 1872 1873 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1874 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1875 if (OldMethod && NewMethod) { 1876 // Preserve triviality. 1877 NewMethod->setTrivial(OldMethod->isTrivial()); 1878 1879 // MSVC allows explicit template specialization at class scope: 1880 // 2 CXMethodDecls referring to the same function will be injected. 1881 // We don't want a redeclartion error. 1882 bool IsClassScopeExplicitSpecialization = 1883 OldMethod->isFunctionTemplateSpecialization() && 1884 NewMethod->isFunctionTemplateSpecialization(); 1885 bool isFriend = NewMethod->getFriendObjectKind(); 1886 1887 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1888 !IsClassScopeExplicitSpecialization) { 1889 // -- Member function declarations with the same name and the 1890 // same parameter types cannot be overloaded if any of them 1891 // is a static member function declaration. 1892 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1893 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1894 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1895 return true; 1896 } 1897 1898 // C++ [class.mem]p1: 1899 // [...] A member shall not be declared twice in the 1900 // member-specification, except that a nested class or member 1901 // class template can be declared and then later defined. 1902 unsigned NewDiag; 1903 if (isa<CXXConstructorDecl>(OldMethod)) 1904 NewDiag = diag::err_constructor_redeclared; 1905 else if (isa<CXXDestructorDecl>(NewMethod)) 1906 NewDiag = diag::err_destructor_redeclared; 1907 else if (isa<CXXConversionDecl>(NewMethod)) 1908 NewDiag = diag::err_conv_function_redeclared; 1909 else 1910 NewDiag = diag::err_member_redeclared; 1911 1912 Diag(New->getLocation(), NewDiag); 1913 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1914 1915 // Complain if this is an explicit declaration of a special 1916 // member that was initially declared implicitly. 1917 // 1918 // As an exception, it's okay to befriend such methods in order 1919 // to permit the implicit constructor/destructor/operator calls. 1920 } else if (OldMethod->isImplicit()) { 1921 if (isFriend) { 1922 NewMethod->setImplicit(); 1923 } else { 1924 Diag(NewMethod->getLocation(), 1925 diag::err_definition_of_implicitly_declared_member) 1926 << New << getSpecialMember(OldMethod); 1927 return true; 1928 } 1929 } else if (OldMethod->isExplicitlyDefaulted()) { 1930 Diag(NewMethod->getLocation(), 1931 diag::err_definition_of_explicitly_defaulted_member) 1932 << getSpecialMember(OldMethod); 1933 return true; 1934 } 1935 } 1936 1937 // (C++98 8.3.5p3): 1938 // All declarations for a function shall agree exactly in both the 1939 // return type and the parameter-type-list. 1940 // We also want to respect all the extended bits except noreturn. 1941 1942 // noreturn should now match unless the old type info didn't have it. 1943 QualType OldQTypeForComparison = OldQType; 1944 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1945 assert(OldQType == QualType(OldType, 0)); 1946 const FunctionType *OldTypeForComparison 1947 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1948 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1949 assert(OldQTypeForComparison.isCanonical()); 1950 } 1951 1952 if (OldQTypeForComparison == NewQType) 1953 return MergeCompatibleFunctionDecls(New, Old, S); 1954 1955 // Fall through for conflicting redeclarations and redefinitions. 1956 } 1957 1958 // C: Function types need to be compatible, not identical. This handles 1959 // duplicate function decls like "void f(int); void f(enum X);" properly. 1960 if (!getLangOpts().CPlusPlus && 1961 Context.typesAreCompatible(OldQType, NewQType)) { 1962 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1963 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1964 const FunctionProtoType *OldProto = 0; 1965 if (isa<FunctionNoProtoType>(NewFuncType) && 1966 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1967 // The old declaration provided a function prototype, but the 1968 // new declaration does not. Merge in the prototype. 1969 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1970 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1971 OldProto->arg_type_end()); 1972 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1973 ParamTypes.data(), ParamTypes.size(), 1974 OldProto->getExtProtoInfo()); 1975 New->setType(NewQType); 1976 New->setHasInheritedPrototype(); 1977 1978 // Synthesize a parameter for each argument type. 1979 SmallVector<ParmVarDecl*, 16> Params; 1980 for (FunctionProtoType::arg_type_iterator 1981 ParamType = OldProto->arg_type_begin(), 1982 ParamEnd = OldProto->arg_type_end(); 1983 ParamType != ParamEnd; ++ParamType) { 1984 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1985 SourceLocation(), 1986 SourceLocation(), 0, 1987 *ParamType, /*TInfo=*/0, 1988 SC_None, SC_None, 1989 0); 1990 Param->setScopeInfo(0, Params.size()); 1991 Param->setImplicit(); 1992 Params.push_back(Param); 1993 } 1994 1995 New->setParams(Params); 1996 } 1997 1998 return MergeCompatibleFunctionDecls(New, Old, S); 1999 } 2000 2001 // GNU C permits a K&R definition to follow a prototype declaration 2002 // if the declared types of the parameters in the K&R definition 2003 // match the types in the prototype declaration, even when the 2004 // promoted types of the parameters from the K&R definition differ 2005 // from the types in the prototype. GCC then keeps the types from 2006 // the prototype. 2007 // 2008 // If a variadic prototype is followed by a non-variadic K&R definition, 2009 // the K&R definition becomes variadic. This is sort of an edge case, but 2010 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 2011 // C99 6.9.1p8. 2012 if (!getLangOpts().CPlusPlus && 2013 Old->hasPrototype() && !New->hasPrototype() && 2014 New->getType()->getAs<FunctionProtoType>() && 2015 Old->getNumParams() == New->getNumParams()) { 2016 SmallVector<QualType, 16> ArgTypes; 2017 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 2018 const FunctionProtoType *OldProto 2019 = Old->getType()->getAs<FunctionProtoType>(); 2020 const FunctionProtoType *NewProto 2021 = New->getType()->getAs<FunctionProtoType>(); 2022 2023 // Determine whether this is the GNU C extension. 2024 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 2025 NewProto->getResultType()); 2026 bool LooseCompatible = !MergedReturn.isNull(); 2027 for (unsigned Idx = 0, End = Old->getNumParams(); 2028 LooseCompatible && Idx != End; ++Idx) { 2029 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 2030 ParmVarDecl *NewParm = New->getParamDecl(Idx); 2031 if (Context.typesAreCompatible(OldParm->getType(), 2032 NewProto->getArgType(Idx))) { 2033 ArgTypes.push_back(NewParm->getType()); 2034 } else if (Context.typesAreCompatible(OldParm->getType(), 2035 NewParm->getType(), 2036 /*CompareUnqualified=*/true)) { 2037 GNUCompatibleParamWarning Warn 2038 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 2039 Warnings.push_back(Warn); 2040 ArgTypes.push_back(NewParm->getType()); 2041 } else 2042 LooseCompatible = false; 2043 } 2044 2045 if (LooseCompatible) { 2046 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 2047 Diag(Warnings[Warn].NewParm->getLocation(), 2048 diag::ext_param_promoted_not_compatible_with_prototype) 2049 << Warnings[Warn].PromotedType 2050 << Warnings[Warn].OldParm->getType(); 2051 if (Warnings[Warn].OldParm->getLocation().isValid()) 2052 Diag(Warnings[Warn].OldParm->getLocation(), 2053 diag::note_previous_declaration); 2054 } 2055 2056 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 2057 ArgTypes.size(), 2058 OldProto->getExtProtoInfo())); 2059 return MergeCompatibleFunctionDecls(New, Old, S); 2060 } 2061 2062 // Fall through to diagnose conflicting types. 2063 } 2064 2065 // A function that has already been declared has been redeclared or defined 2066 // with a different type- show appropriate diagnostic 2067 if (unsigned BuiltinID = Old->getBuiltinID()) { 2068 // The user has declared a builtin function with an incompatible 2069 // signature. 2070 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2071 // The function the user is redeclaring is a library-defined 2072 // function like 'malloc' or 'printf'. Warn about the 2073 // redeclaration, then pretend that we don't know about this 2074 // library built-in. 2075 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2076 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2077 << Old << Old->getType(); 2078 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2079 Old->setInvalidDecl(); 2080 return false; 2081 } 2082 2083 PrevDiag = diag::note_previous_builtin_declaration; 2084 } 2085 2086 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2087 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2088 return true; 2089} 2090 2091/// \brief Completes the merge of two function declarations that are 2092/// known to be compatible. 2093/// 2094/// This routine handles the merging of attributes and other 2095/// properties of function declarations form the old declaration to 2096/// the new declaration, once we know that New is in fact a 2097/// redeclaration of Old. 2098/// 2099/// \returns false 2100bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old, 2101 Scope *S) { 2102 // Merge the attributes 2103 mergeDeclAttributes(New, Old); 2104 2105 // Merge the storage class. 2106 if (Old->getStorageClass() != SC_Extern && 2107 Old->getStorageClass() != SC_None) 2108 New->setStorageClass(Old->getStorageClass()); 2109 2110 // Merge "pure" flag. 2111 if (Old->isPure()) 2112 New->setPure(); 2113 2114 // Merge attributes from the parameters. These can mismatch with K&R 2115 // declarations. 2116 if (New->getNumParams() == Old->getNumParams()) 2117 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2118 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2119 Context); 2120 2121 if (getLangOpts().CPlusPlus) 2122 return MergeCXXFunctionDecl(New, Old, S); 2123 2124 return false; 2125} 2126 2127 2128void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2129 ObjCMethodDecl *oldMethod) { 2130 // We don't want to merge unavailable and deprecated attributes 2131 // except from interface to implementation. 2132 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2133 2134 // Merge the attributes. 2135 mergeDeclAttributes(newMethod, oldMethod, mergeDeprecation); 2136 2137 // Merge attributes from the parameters. 2138 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2139 for (ObjCMethodDecl::param_iterator 2140 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2141 ni != ne; ++ni, ++oi) 2142 mergeParamDeclAttributes(*ni, *oi, Context); 2143 2144 CheckObjCMethodOverride(newMethod, oldMethod, true); 2145} 2146 2147/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2148/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2149/// emitting diagnostics as appropriate. 2150/// 2151/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2152/// to here in AddInitializerToDecl. We can't check them before the initializer 2153/// is attached. 2154void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2155 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2156 return; 2157 2158 QualType MergedT; 2159 if (getLangOpts().CPlusPlus) { 2160 AutoType *AT = New->getType()->getContainedAutoType(); 2161 if (AT && !AT->isDeduced()) { 2162 // We don't know what the new type is until the initializer is attached. 2163 return; 2164 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2165 // These could still be something that needs exception specs checked. 2166 return MergeVarDeclExceptionSpecs(New, Old); 2167 } 2168 // C++ [basic.link]p10: 2169 // [...] the types specified by all declarations referring to a given 2170 // object or function shall be identical, except that declarations for an 2171 // array object can specify array types that differ by the presence or 2172 // absence of a major array bound (8.3.4). 2173 else if (Old->getType()->isIncompleteArrayType() && 2174 New->getType()->isArrayType()) { 2175 CanQual<ArrayType> OldArray 2176 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2177 CanQual<ArrayType> NewArray 2178 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2179 if (OldArray->getElementType() == NewArray->getElementType()) 2180 MergedT = New->getType(); 2181 } else if (Old->getType()->isArrayType() && 2182 New->getType()->isIncompleteArrayType()) { 2183 CanQual<ArrayType> OldArray 2184 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2185 CanQual<ArrayType> NewArray 2186 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2187 if (OldArray->getElementType() == NewArray->getElementType()) 2188 MergedT = Old->getType(); 2189 } else if (New->getType()->isObjCObjectPointerType() 2190 && Old->getType()->isObjCObjectPointerType()) { 2191 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2192 Old->getType()); 2193 } 2194 } else { 2195 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2196 } 2197 if (MergedT.isNull()) { 2198 Diag(New->getLocation(), diag::err_redefinition_different_type) 2199 << New->getDeclName(); 2200 Diag(Old->getLocation(), diag::note_previous_definition); 2201 return New->setInvalidDecl(); 2202 } 2203 New->setType(MergedT); 2204} 2205 2206/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2207/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2208/// situation, merging decls or emitting diagnostics as appropriate. 2209/// 2210/// Tentative definition rules (C99 6.9.2p2) are checked by 2211/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2212/// definitions here, since the initializer hasn't been attached. 2213/// 2214void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2215 // If the new decl is already invalid, don't do any other checking. 2216 if (New->isInvalidDecl()) 2217 return; 2218 2219 // Verify the old decl was also a variable. 2220 VarDecl *Old = 0; 2221 if (!Previous.isSingleResult() || 2222 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2223 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2224 << New->getDeclName(); 2225 Diag(Previous.getRepresentativeDecl()->getLocation(), 2226 diag::note_previous_definition); 2227 return New->setInvalidDecl(); 2228 } 2229 2230 // C++ [class.mem]p1: 2231 // A member shall not be declared twice in the member-specification [...] 2232 // 2233 // Here, we need only consider static data members. 2234 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2235 Diag(New->getLocation(), diag::err_duplicate_member) 2236 << New->getIdentifier(); 2237 Diag(Old->getLocation(), diag::note_previous_declaration); 2238 New->setInvalidDecl(); 2239 } 2240 2241 mergeDeclAttributes(New, Old); 2242 // Warn if an already-declared variable is made a weak_import in a subsequent 2243 // declaration 2244 if (New->getAttr<WeakImportAttr>() && 2245 Old->getStorageClass() == SC_None && 2246 !Old->getAttr<WeakImportAttr>()) { 2247 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2248 Diag(Old->getLocation(), diag::note_previous_definition); 2249 // Remove weak_import attribute on new declaration. 2250 New->dropAttr<WeakImportAttr>(); 2251 } 2252 2253 // Merge the types. 2254 MergeVarDeclTypes(New, Old); 2255 if (New->isInvalidDecl()) 2256 return; 2257 2258 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2259 if (New->getStorageClass() == SC_Static && 2260 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2261 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2262 Diag(Old->getLocation(), diag::note_previous_definition); 2263 return New->setInvalidDecl(); 2264 } 2265 // C99 6.2.2p4: 2266 // For an identifier declared with the storage-class specifier 2267 // extern in a scope in which a prior declaration of that 2268 // identifier is visible,23) if the prior declaration specifies 2269 // internal or external linkage, the linkage of the identifier at 2270 // the later declaration is the same as the linkage specified at 2271 // the prior declaration. If no prior declaration is visible, or 2272 // if the prior declaration specifies no linkage, then the 2273 // identifier has external linkage. 2274 if (New->hasExternalStorage() && Old->hasLinkage()) 2275 /* Okay */; 2276 else if (New->getStorageClass() != SC_Static && 2277 Old->getStorageClass() == SC_Static) { 2278 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2279 Diag(Old->getLocation(), diag::note_previous_definition); 2280 return New->setInvalidDecl(); 2281 } 2282 2283 // Check if extern is followed by non-extern and vice-versa. 2284 if (New->hasExternalStorage() && 2285 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2286 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2287 Diag(Old->getLocation(), diag::note_previous_definition); 2288 return New->setInvalidDecl(); 2289 } 2290 if (Old->hasExternalStorage() && 2291 !New->hasLinkage() && New->isLocalVarDecl()) { 2292 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2293 Diag(Old->getLocation(), diag::note_previous_definition); 2294 return New->setInvalidDecl(); 2295 } 2296 2297 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2298 2299 // FIXME: The test for external storage here seems wrong? We still 2300 // need to check for mismatches. 2301 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2302 // Don't complain about out-of-line definitions of static members. 2303 !(Old->getLexicalDeclContext()->isRecord() && 2304 !New->getLexicalDeclContext()->isRecord())) { 2305 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2306 Diag(Old->getLocation(), diag::note_previous_definition); 2307 return New->setInvalidDecl(); 2308 } 2309 2310 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2311 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2312 Diag(Old->getLocation(), diag::note_previous_definition); 2313 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2314 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2315 Diag(Old->getLocation(), diag::note_previous_definition); 2316 } 2317 2318 // C++ doesn't have tentative definitions, so go right ahead and check here. 2319 const VarDecl *Def; 2320 if (getLangOpts().CPlusPlus && 2321 New->isThisDeclarationADefinition() == VarDecl::Definition && 2322 (Def = Old->getDefinition())) { 2323 Diag(New->getLocation(), diag::err_redefinition) 2324 << New->getDeclName(); 2325 Diag(Def->getLocation(), diag::note_previous_definition); 2326 New->setInvalidDecl(); 2327 return; 2328 } 2329 // c99 6.2.2 P4. 2330 // For an identifier declared with the storage-class specifier extern in a 2331 // scope in which a prior declaration of that identifier is visible, if 2332 // the prior declaration specifies internal or external linkage, the linkage 2333 // of the identifier at the later declaration is the same as the linkage 2334 // specified at the prior declaration. 2335 // FIXME. revisit this code. 2336 if (New->hasExternalStorage() && 2337 Old->getLinkage() == InternalLinkage && 2338 New->getDeclContext() == Old->getDeclContext()) 2339 New->setStorageClass(Old->getStorageClass()); 2340 2341 // Keep a chain of previous declarations. 2342 New->setPreviousDeclaration(Old); 2343 2344 // Inherit access appropriately. 2345 New->setAccess(Old->getAccess()); 2346} 2347 2348/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2349/// no declarator (e.g. "struct foo;") is parsed. 2350Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2351 DeclSpec &DS) { 2352 return ParsedFreeStandingDeclSpec(S, AS, DS, 2353 MultiTemplateParamsArg(*this, 0, 0)); 2354} 2355 2356/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2357/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2358/// parameters to cope with template friend declarations. 2359Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2360 DeclSpec &DS, 2361 MultiTemplateParamsArg TemplateParams) { 2362 Decl *TagD = 0; 2363 TagDecl *Tag = 0; 2364 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2365 DS.getTypeSpecType() == DeclSpec::TST_struct || 2366 DS.getTypeSpecType() == DeclSpec::TST_union || 2367 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2368 TagD = DS.getRepAsDecl(); 2369 2370 if (!TagD) // We probably had an error 2371 return 0; 2372 2373 // Note that the above type specs guarantee that the 2374 // type rep is a Decl, whereas in many of the others 2375 // it's a Type. 2376 if (isa<TagDecl>(TagD)) 2377 Tag = cast<TagDecl>(TagD); 2378 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2379 Tag = CTD->getTemplatedDecl(); 2380 } 2381 2382 if (Tag) { 2383 Tag->setFreeStanding(); 2384 if (Tag->isInvalidDecl()) 2385 return Tag; 2386 } 2387 2388 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2389 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2390 // or incomplete types shall not be restrict-qualified." 2391 if (TypeQuals & DeclSpec::TQ_restrict) 2392 Diag(DS.getRestrictSpecLoc(), 2393 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2394 << DS.getSourceRange(); 2395 } 2396 2397 if (DS.isConstexprSpecified()) { 2398 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2399 // and definitions of functions and variables. 2400 if (Tag) 2401 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2402 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2403 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2404 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2405 else 2406 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2407 // Don't emit warnings after this error. 2408 return TagD; 2409 } 2410 2411 if (DS.isFriendSpecified()) { 2412 // If we're dealing with a decl but not a TagDecl, assume that 2413 // whatever routines created it handled the friendship aspect. 2414 if (TagD && !Tag) 2415 return 0; 2416 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2417 } 2418 2419 // Track whether we warned about the fact that there aren't any 2420 // declarators. 2421 bool emittedWarning = false; 2422 2423 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2424 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2425 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2426 if (getLangOpts().CPlusPlus || 2427 Record->getDeclContext()->isRecord()) 2428 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2429 2430 Diag(DS.getLocStart(), diag::ext_no_declarators) 2431 << DS.getSourceRange(); 2432 emittedWarning = true; 2433 } 2434 } 2435 2436 // Check for Microsoft C extension: anonymous struct. 2437 if (getLangOpts().MicrosoftExt && !getLangOpts().CPlusPlus && 2438 CurContext->isRecord() && 2439 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2440 // Handle 2 kinds of anonymous struct: 2441 // struct STRUCT; 2442 // and 2443 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2444 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2445 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2446 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2447 DS.getRepAsType().get()->isStructureType())) { 2448 Diag(DS.getLocStart(), diag::ext_ms_anonymous_struct) 2449 << DS.getSourceRange(); 2450 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2451 } 2452 } 2453 2454 if (getLangOpts().CPlusPlus && 2455 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2456 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2457 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2458 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2459 Diag(Enum->getLocation(), diag::ext_no_declarators) 2460 << DS.getSourceRange(); 2461 emittedWarning = true; 2462 } 2463 2464 // Skip all the checks below if we have a type error. 2465 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2466 2467 if (!DS.isMissingDeclaratorOk()) { 2468 // Warn about typedefs of enums without names, since this is an 2469 // extension in both Microsoft and GNU. 2470 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2471 Tag && isa<EnumDecl>(Tag)) { 2472 Diag(DS.getLocStart(), diag::ext_typedef_without_a_name) 2473 << DS.getSourceRange(); 2474 return Tag; 2475 } 2476 2477 Diag(DS.getLocStart(), diag::ext_no_declarators) 2478 << DS.getSourceRange(); 2479 emittedWarning = true; 2480 } 2481 2482 // We're going to complain about a bunch of spurious specifiers; 2483 // only do this if we're declaring a tag, because otherwise we 2484 // should be getting diag::ext_no_declarators. 2485 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2486 return TagD; 2487 2488 // Note that a linkage-specification sets a storage class, but 2489 // 'extern "C" struct foo;' is actually valid and not theoretically 2490 // useless. 2491 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2492 if (!DS.isExternInLinkageSpec()) 2493 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2494 << DeclSpec::getSpecifierName(scs); 2495 2496 if (DS.isThreadSpecified()) 2497 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2498 if (DS.getTypeQualifiers()) { 2499 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2500 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2501 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2502 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2503 // Restrict is covered above. 2504 } 2505 if (DS.isInlineSpecified()) 2506 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2507 if (DS.isVirtualSpecified()) 2508 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2509 if (DS.isExplicitSpecified()) 2510 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2511 2512 if (DS.isModulePrivateSpecified() && 2513 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2514 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2515 << Tag->getTagKind() 2516 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2517 2518 // Warn about ignored type attributes, for example: 2519 // __attribute__((aligned)) struct A; 2520 // Attributes should be placed after tag to apply to type declaration. 2521 if (!DS.getAttributes().empty()) { 2522 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2523 if (TypeSpecType == DeclSpec::TST_class || 2524 TypeSpecType == DeclSpec::TST_struct || 2525 TypeSpecType == DeclSpec::TST_union || 2526 TypeSpecType == DeclSpec::TST_enum) { 2527 AttributeList* attrs = DS.getAttributes().getList(); 2528 while (attrs) { 2529 Diag(attrs->getScopeLoc(), 2530 diag::warn_declspec_attribute_ignored) 2531 << attrs->getName() 2532 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2533 TypeSpecType == DeclSpec::TST_struct ? 1 : 2534 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2535 attrs = attrs->getNext(); 2536 } 2537 } 2538 } 2539 2540 return TagD; 2541} 2542 2543/// We are trying to inject an anonymous member into the given scope; 2544/// check if there's an existing declaration that can't be overloaded. 2545/// 2546/// \return true if this is a forbidden redeclaration 2547static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2548 Scope *S, 2549 DeclContext *Owner, 2550 DeclarationName Name, 2551 SourceLocation NameLoc, 2552 unsigned diagnostic) { 2553 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2554 Sema::ForRedeclaration); 2555 if (!SemaRef.LookupName(R, S)) return false; 2556 2557 if (R.getAsSingle<TagDecl>()) 2558 return false; 2559 2560 // Pick a representative declaration. 2561 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2562 assert(PrevDecl && "Expected a non-null Decl"); 2563 2564 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2565 return false; 2566 2567 SemaRef.Diag(NameLoc, diagnostic) << Name; 2568 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2569 2570 return true; 2571} 2572 2573/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2574/// anonymous struct or union AnonRecord into the owning context Owner 2575/// and scope S. This routine will be invoked just after we realize 2576/// that an unnamed union or struct is actually an anonymous union or 2577/// struct, e.g., 2578/// 2579/// @code 2580/// union { 2581/// int i; 2582/// float f; 2583/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2584/// // f into the surrounding scope.x 2585/// @endcode 2586/// 2587/// This routine is recursive, injecting the names of nested anonymous 2588/// structs/unions into the owning context and scope as well. 2589static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2590 DeclContext *Owner, 2591 RecordDecl *AnonRecord, 2592 AccessSpecifier AS, 2593 SmallVector<NamedDecl*, 2> &Chaining, 2594 bool MSAnonStruct) { 2595 unsigned diagKind 2596 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2597 : diag::err_anonymous_struct_member_redecl; 2598 2599 bool Invalid = false; 2600 2601 // Look every FieldDecl and IndirectFieldDecl with a name. 2602 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2603 DEnd = AnonRecord->decls_end(); 2604 D != DEnd; ++D) { 2605 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2606 cast<NamedDecl>(*D)->getDeclName()) { 2607 ValueDecl *VD = cast<ValueDecl>(*D); 2608 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2609 VD->getLocation(), diagKind)) { 2610 // C++ [class.union]p2: 2611 // The names of the members of an anonymous union shall be 2612 // distinct from the names of any other entity in the 2613 // scope in which the anonymous union is declared. 2614 Invalid = true; 2615 } else { 2616 // C++ [class.union]p2: 2617 // For the purpose of name lookup, after the anonymous union 2618 // definition, the members of the anonymous union are 2619 // considered to have been defined in the scope in which the 2620 // anonymous union is declared. 2621 unsigned OldChainingSize = Chaining.size(); 2622 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2623 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2624 PE = IF->chain_end(); PI != PE; ++PI) 2625 Chaining.push_back(*PI); 2626 else 2627 Chaining.push_back(VD); 2628 2629 assert(Chaining.size() >= 2); 2630 NamedDecl **NamedChain = 2631 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2632 for (unsigned i = 0; i < Chaining.size(); i++) 2633 NamedChain[i] = Chaining[i]; 2634 2635 IndirectFieldDecl* IndirectField = 2636 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2637 VD->getIdentifier(), VD->getType(), 2638 NamedChain, Chaining.size()); 2639 2640 IndirectField->setAccess(AS); 2641 IndirectField->setImplicit(); 2642 SemaRef.PushOnScopeChains(IndirectField, S); 2643 2644 // That includes picking up the appropriate access specifier. 2645 if (AS != AS_none) IndirectField->setAccess(AS); 2646 2647 Chaining.resize(OldChainingSize); 2648 } 2649 } 2650 } 2651 2652 return Invalid; 2653} 2654 2655/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2656/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2657/// illegal input values are mapped to SC_None. 2658static StorageClass 2659StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2660 switch (StorageClassSpec) { 2661 case DeclSpec::SCS_unspecified: return SC_None; 2662 case DeclSpec::SCS_extern: return SC_Extern; 2663 case DeclSpec::SCS_static: return SC_Static; 2664 case DeclSpec::SCS_auto: return SC_Auto; 2665 case DeclSpec::SCS_register: return SC_Register; 2666 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2667 // Illegal SCSs map to None: error reporting is up to the caller. 2668 case DeclSpec::SCS_mutable: // Fall through. 2669 case DeclSpec::SCS_typedef: return SC_None; 2670 } 2671 llvm_unreachable("unknown storage class specifier"); 2672} 2673 2674/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2675/// a StorageClass. Any error reporting is up to the caller: 2676/// illegal input values are mapped to SC_None. 2677static StorageClass 2678StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2679 switch (StorageClassSpec) { 2680 case DeclSpec::SCS_unspecified: return SC_None; 2681 case DeclSpec::SCS_extern: return SC_Extern; 2682 case DeclSpec::SCS_static: return SC_Static; 2683 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2684 // Illegal SCSs map to None: error reporting is up to the caller. 2685 case DeclSpec::SCS_auto: // Fall through. 2686 case DeclSpec::SCS_mutable: // Fall through. 2687 case DeclSpec::SCS_register: // Fall through. 2688 case DeclSpec::SCS_typedef: return SC_None; 2689 } 2690 llvm_unreachable("unknown storage class specifier"); 2691} 2692 2693/// BuildAnonymousStructOrUnion - Handle the declaration of an 2694/// anonymous structure or union. Anonymous unions are a C++ feature 2695/// (C++ [class.union]) and a C11 feature; anonymous structures 2696/// are a C11 feature and GNU C++ extension. 2697Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2698 AccessSpecifier AS, 2699 RecordDecl *Record) { 2700 DeclContext *Owner = Record->getDeclContext(); 2701 2702 // Diagnose whether this anonymous struct/union is an extension. 2703 if (Record->isUnion() && !getLangOpts().CPlusPlus && !getLangOpts().C11) 2704 Diag(Record->getLocation(), diag::ext_anonymous_union); 2705 else if (!Record->isUnion() && getLangOpts().CPlusPlus) 2706 Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct); 2707 else if (!Record->isUnion() && !getLangOpts().C11) 2708 Diag(Record->getLocation(), diag::ext_c11_anonymous_struct); 2709 2710 // C and C++ require different kinds of checks for anonymous 2711 // structs/unions. 2712 bool Invalid = false; 2713 if (getLangOpts().CPlusPlus) { 2714 const char* PrevSpec = 0; 2715 unsigned DiagID; 2716 if (Record->isUnion()) { 2717 // C++ [class.union]p6: 2718 // Anonymous unions declared in a named namespace or in the 2719 // global namespace shall be declared static. 2720 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2721 (isa<TranslationUnitDecl>(Owner) || 2722 (isa<NamespaceDecl>(Owner) && 2723 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2724 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2725 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2726 2727 // Recover by adding 'static'. 2728 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2729 PrevSpec, DiagID); 2730 } 2731 // C++ [class.union]p6: 2732 // A storage class is not allowed in a declaration of an 2733 // anonymous union in a class scope. 2734 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2735 isa<RecordDecl>(Owner)) { 2736 Diag(DS.getStorageClassSpecLoc(), 2737 diag::err_anonymous_union_with_storage_spec) 2738 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2739 2740 // Recover by removing the storage specifier. 2741 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2742 SourceLocation(), 2743 PrevSpec, DiagID); 2744 } 2745 } 2746 2747 // Ignore const/volatile/restrict qualifiers. 2748 if (DS.getTypeQualifiers()) { 2749 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2750 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2751 << Record->isUnion() << 0 2752 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2753 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2754 Diag(DS.getVolatileSpecLoc(), 2755 diag::ext_anonymous_struct_union_qualified) 2756 << Record->isUnion() << 1 2757 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2758 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2759 Diag(DS.getRestrictSpecLoc(), 2760 diag::ext_anonymous_struct_union_qualified) 2761 << Record->isUnion() << 2 2762 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2763 2764 DS.ClearTypeQualifiers(); 2765 } 2766 2767 // C++ [class.union]p2: 2768 // The member-specification of an anonymous union shall only 2769 // define non-static data members. [Note: nested types and 2770 // functions cannot be declared within an anonymous union. ] 2771 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2772 MemEnd = Record->decls_end(); 2773 Mem != MemEnd; ++Mem) { 2774 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2775 // C++ [class.union]p3: 2776 // An anonymous union shall not have private or protected 2777 // members (clause 11). 2778 assert(FD->getAccess() != AS_none); 2779 if (FD->getAccess() != AS_public) { 2780 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2781 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2782 Invalid = true; 2783 } 2784 2785 // C++ [class.union]p1 2786 // An object of a class with a non-trivial constructor, a non-trivial 2787 // copy constructor, a non-trivial destructor, or a non-trivial copy 2788 // assignment operator cannot be a member of a union, nor can an 2789 // array of such objects. 2790 if (CheckNontrivialField(FD)) 2791 Invalid = true; 2792 } else if ((*Mem)->isImplicit()) { 2793 // Any implicit members are fine. 2794 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2795 // This is a type that showed up in an 2796 // elaborated-type-specifier inside the anonymous struct or 2797 // union, but which actually declares a type outside of the 2798 // anonymous struct or union. It's okay. 2799 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2800 if (!MemRecord->isAnonymousStructOrUnion() && 2801 MemRecord->getDeclName()) { 2802 // Visual C++ allows type definition in anonymous struct or union. 2803 if (getLangOpts().MicrosoftExt) 2804 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2805 << (int)Record->isUnion(); 2806 else { 2807 // This is a nested type declaration. 2808 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2809 << (int)Record->isUnion(); 2810 Invalid = true; 2811 } 2812 } 2813 } else if (isa<AccessSpecDecl>(*Mem)) { 2814 // Any access specifier is fine. 2815 } else { 2816 // We have something that isn't a non-static data 2817 // member. Complain about it. 2818 unsigned DK = diag::err_anonymous_record_bad_member; 2819 if (isa<TypeDecl>(*Mem)) 2820 DK = diag::err_anonymous_record_with_type; 2821 else if (isa<FunctionDecl>(*Mem)) 2822 DK = diag::err_anonymous_record_with_function; 2823 else if (isa<VarDecl>(*Mem)) 2824 DK = diag::err_anonymous_record_with_static; 2825 2826 // Visual C++ allows type definition in anonymous struct or union. 2827 if (getLangOpts().MicrosoftExt && 2828 DK == diag::err_anonymous_record_with_type) 2829 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2830 << (int)Record->isUnion(); 2831 else { 2832 Diag((*Mem)->getLocation(), DK) 2833 << (int)Record->isUnion(); 2834 Invalid = true; 2835 } 2836 } 2837 } 2838 } 2839 2840 if (!Record->isUnion() && !Owner->isRecord()) { 2841 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2842 << (int)getLangOpts().CPlusPlus; 2843 Invalid = true; 2844 } 2845 2846 // Mock up a declarator. 2847 Declarator Dc(DS, Declarator::MemberContext); 2848 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2849 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2850 2851 // Create a declaration for this anonymous struct/union. 2852 NamedDecl *Anon = 0; 2853 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2854 Anon = FieldDecl::Create(Context, OwningClass, 2855 DS.getLocStart(), 2856 Record->getLocation(), 2857 /*IdentifierInfo=*/0, 2858 Context.getTypeDeclType(Record), 2859 TInfo, 2860 /*BitWidth=*/0, /*Mutable=*/false, 2861 /*HasInit=*/false); 2862 Anon->setAccess(AS); 2863 if (getLangOpts().CPlusPlus) 2864 FieldCollector->Add(cast<FieldDecl>(Anon)); 2865 } else { 2866 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2867 assert(SCSpec != DeclSpec::SCS_typedef && 2868 "Parser allowed 'typedef' as storage class VarDecl."); 2869 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2870 if (SCSpec == DeclSpec::SCS_mutable) { 2871 // mutable can only appear on non-static class members, so it's always 2872 // an error here 2873 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2874 Invalid = true; 2875 SC = SC_None; 2876 } 2877 SCSpec = DS.getStorageClassSpecAsWritten(); 2878 VarDecl::StorageClass SCAsWritten 2879 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2880 2881 Anon = VarDecl::Create(Context, Owner, 2882 DS.getLocStart(), 2883 Record->getLocation(), /*IdentifierInfo=*/0, 2884 Context.getTypeDeclType(Record), 2885 TInfo, SC, SCAsWritten); 2886 2887 // Default-initialize the implicit variable. This initialization will be 2888 // trivial in almost all cases, except if a union member has an in-class 2889 // initializer: 2890 // union { int n = 0; }; 2891 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2892 } 2893 Anon->setImplicit(); 2894 2895 // Add the anonymous struct/union object to the current 2896 // context. We'll be referencing this object when we refer to one of 2897 // its members. 2898 Owner->addDecl(Anon); 2899 2900 // Inject the members of the anonymous struct/union into the owning 2901 // context and into the identifier resolver chain for name lookup 2902 // purposes. 2903 SmallVector<NamedDecl*, 2> Chain; 2904 Chain.push_back(Anon); 2905 2906 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2907 Chain, false)) 2908 Invalid = true; 2909 2910 // Mark this as an anonymous struct/union type. Note that we do not 2911 // do this until after we have already checked and injected the 2912 // members of this anonymous struct/union type, because otherwise 2913 // the members could be injected twice: once by DeclContext when it 2914 // builds its lookup table, and once by 2915 // InjectAnonymousStructOrUnionMembers. 2916 Record->setAnonymousStructOrUnion(true); 2917 2918 if (Invalid) 2919 Anon->setInvalidDecl(); 2920 2921 return Anon; 2922} 2923 2924/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2925/// Microsoft C anonymous structure. 2926/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2927/// Example: 2928/// 2929/// struct A { int a; }; 2930/// struct B { struct A; int b; }; 2931/// 2932/// void foo() { 2933/// B var; 2934/// var.a = 3; 2935/// } 2936/// 2937Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2938 RecordDecl *Record) { 2939 2940 // If there is no Record, get the record via the typedef. 2941 if (!Record) 2942 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2943 2944 // Mock up a declarator. 2945 Declarator Dc(DS, Declarator::TypeNameContext); 2946 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2947 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2948 2949 // Create a declaration for this anonymous struct. 2950 NamedDecl* Anon = FieldDecl::Create(Context, 2951 cast<RecordDecl>(CurContext), 2952 DS.getLocStart(), 2953 DS.getLocStart(), 2954 /*IdentifierInfo=*/0, 2955 Context.getTypeDeclType(Record), 2956 TInfo, 2957 /*BitWidth=*/0, /*Mutable=*/false, 2958 /*HasInit=*/false); 2959 Anon->setImplicit(); 2960 2961 // Add the anonymous struct object to the current context. 2962 CurContext->addDecl(Anon); 2963 2964 // Inject the members of the anonymous struct into the current 2965 // context and into the identifier resolver chain for name lookup 2966 // purposes. 2967 SmallVector<NamedDecl*, 2> Chain; 2968 Chain.push_back(Anon); 2969 2970 RecordDecl *RecordDef = Record->getDefinition(); 2971 if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2972 RecordDef, AS_none, 2973 Chain, true)) 2974 Anon->setInvalidDecl(); 2975 2976 return Anon; 2977} 2978 2979/// GetNameForDeclarator - Determine the full declaration name for the 2980/// given Declarator. 2981DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2982 return GetNameFromUnqualifiedId(D.getName()); 2983} 2984 2985/// \brief Retrieves the declaration name from a parsed unqualified-id. 2986DeclarationNameInfo 2987Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2988 DeclarationNameInfo NameInfo; 2989 NameInfo.setLoc(Name.StartLocation); 2990 2991 switch (Name.getKind()) { 2992 2993 case UnqualifiedId::IK_ImplicitSelfParam: 2994 case UnqualifiedId::IK_Identifier: 2995 NameInfo.setName(Name.Identifier); 2996 NameInfo.setLoc(Name.StartLocation); 2997 return NameInfo; 2998 2999 case UnqualifiedId::IK_OperatorFunctionId: 3000 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 3001 Name.OperatorFunctionId.Operator)); 3002 NameInfo.setLoc(Name.StartLocation); 3003 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 3004 = Name.OperatorFunctionId.SymbolLocations[0]; 3005 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 3006 = Name.EndLocation.getRawEncoding(); 3007 return NameInfo; 3008 3009 case UnqualifiedId::IK_LiteralOperatorId: 3010 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 3011 Name.Identifier)); 3012 NameInfo.setLoc(Name.StartLocation); 3013 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 3014 return NameInfo; 3015 3016 case UnqualifiedId::IK_ConversionFunctionId: { 3017 TypeSourceInfo *TInfo; 3018 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 3019 if (Ty.isNull()) 3020 return DeclarationNameInfo(); 3021 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 3022 Context.getCanonicalType(Ty))); 3023 NameInfo.setLoc(Name.StartLocation); 3024 NameInfo.setNamedTypeInfo(TInfo); 3025 return NameInfo; 3026 } 3027 3028 case UnqualifiedId::IK_ConstructorName: { 3029 TypeSourceInfo *TInfo; 3030 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 3031 if (Ty.isNull()) 3032 return DeclarationNameInfo(); 3033 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3034 Context.getCanonicalType(Ty))); 3035 NameInfo.setLoc(Name.StartLocation); 3036 NameInfo.setNamedTypeInfo(TInfo); 3037 return NameInfo; 3038 } 3039 3040 case UnqualifiedId::IK_ConstructorTemplateId: { 3041 // In well-formed code, we can only have a constructor 3042 // template-id that refers to the current context, so go there 3043 // to find the actual type being constructed. 3044 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 3045 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 3046 return DeclarationNameInfo(); 3047 3048 // Determine the type of the class being constructed. 3049 QualType CurClassType = Context.getTypeDeclType(CurClass); 3050 3051 // FIXME: Check two things: that the template-id names the same type as 3052 // CurClassType, and that the template-id does not occur when the name 3053 // was qualified. 3054 3055 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3056 Context.getCanonicalType(CurClassType))); 3057 NameInfo.setLoc(Name.StartLocation); 3058 // FIXME: should we retrieve TypeSourceInfo? 3059 NameInfo.setNamedTypeInfo(0); 3060 return NameInfo; 3061 } 3062 3063 case UnqualifiedId::IK_DestructorName: { 3064 TypeSourceInfo *TInfo; 3065 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3066 if (Ty.isNull()) 3067 return DeclarationNameInfo(); 3068 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3069 Context.getCanonicalType(Ty))); 3070 NameInfo.setLoc(Name.StartLocation); 3071 NameInfo.setNamedTypeInfo(TInfo); 3072 return NameInfo; 3073 } 3074 3075 case UnqualifiedId::IK_TemplateId: { 3076 TemplateName TName = Name.TemplateId->Template.get(); 3077 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3078 return Context.getNameForTemplate(TName, TNameLoc); 3079 } 3080 3081 } // switch (Name.getKind()) 3082 3083 llvm_unreachable("Unknown name kind"); 3084} 3085 3086static QualType getCoreType(QualType Ty) { 3087 do { 3088 if (Ty->isPointerType() || Ty->isReferenceType()) 3089 Ty = Ty->getPointeeType(); 3090 else if (Ty->isArrayType()) 3091 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3092 else 3093 return Ty.withoutLocalFastQualifiers(); 3094 } while (true); 3095} 3096 3097/// hasSimilarParameters - Determine whether the C++ functions Declaration 3098/// and Definition have "nearly" matching parameters. This heuristic is 3099/// used to improve diagnostics in the case where an out-of-line function 3100/// definition doesn't match any declaration within the class or namespace. 3101/// Also sets Params to the list of indices to the parameters that differ 3102/// between the declaration and the definition. If hasSimilarParameters 3103/// returns true and Params is empty, then all of the parameters match. 3104static bool hasSimilarParameters(ASTContext &Context, 3105 FunctionDecl *Declaration, 3106 FunctionDecl *Definition, 3107 llvm::SmallVectorImpl<unsigned> &Params) { 3108 Params.clear(); 3109 if (Declaration->param_size() != Definition->param_size()) 3110 return false; 3111 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3112 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3113 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3114 3115 // The parameter types are identical 3116 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3117 continue; 3118 3119 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3120 QualType DefParamBaseTy = getCoreType(DefParamTy); 3121 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3122 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3123 3124 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3125 (DeclTyName && DeclTyName == DefTyName)) 3126 Params.push_back(Idx); 3127 else // The two parameters aren't even close 3128 return false; 3129 } 3130 3131 return true; 3132} 3133 3134/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3135/// declarator needs to be rebuilt in the current instantiation. 3136/// Any bits of declarator which appear before the name are valid for 3137/// consideration here. That's specifically the type in the decl spec 3138/// and the base type in any member-pointer chunks. 3139static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3140 DeclarationName Name) { 3141 // The types we specifically need to rebuild are: 3142 // - typenames, typeofs, and decltypes 3143 // - types which will become injected class names 3144 // Of course, we also need to rebuild any type referencing such a 3145 // type. It's safest to just say "dependent", but we call out a 3146 // few cases here. 3147 3148 DeclSpec &DS = D.getMutableDeclSpec(); 3149 switch (DS.getTypeSpecType()) { 3150 case DeclSpec::TST_typename: 3151 case DeclSpec::TST_typeofType: 3152 case DeclSpec::TST_decltype: 3153 case DeclSpec::TST_underlyingType: 3154 case DeclSpec::TST_atomic: { 3155 // Grab the type from the parser. 3156 TypeSourceInfo *TSI = 0; 3157 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3158 if (T.isNull() || !T->isDependentType()) break; 3159 3160 // Make sure there's a type source info. This isn't really much 3161 // of a waste; most dependent types should have type source info 3162 // attached already. 3163 if (!TSI) 3164 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3165 3166 // Rebuild the type in the current instantiation. 3167 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3168 if (!TSI) return true; 3169 3170 // Store the new type back in the decl spec. 3171 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3172 DS.UpdateTypeRep(LocType); 3173 break; 3174 } 3175 3176 case DeclSpec::TST_typeofExpr: { 3177 Expr *E = DS.getRepAsExpr(); 3178 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3179 if (Result.isInvalid()) return true; 3180 DS.UpdateExprRep(Result.get()); 3181 break; 3182 } 3183 3184 default: 3185 // Nothing to do for these decl specs. 3186 break; 3187 } 3188 3189 // It doesn't matter what order we do this in. 3190 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3191 DeclaratorChunk &Chunk = D.getTypeObject(I); 3192 3193 // The only type information in the declarator which can come 3194 // before the declaration name is the base type of a member 3195 // pointer. 3196 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3197 continue; 3198 3199 // Rebuild the scope specifier in-place. 3200 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3201 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3202 return true; 3203 } 3204 3205 return false; 3206} 3207 3208Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3209 D.setFunctionDefinitionKind(FDK_Declaration); 3210 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3211 3212 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3213 Dcl->getDeclContext()->isFileContext()) 3214 Dcl->setTopLevelDeclInObjCContainer(); 3215 3216 return Dcl; 3217} 3218 3219/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3220/// If T is the name of a class, then each of the following shall have a 3221/// name different from T: 3222/// - every static data member of class T; 3223/// - every member function of class T 3224/// - every member of class T that is itself a type; 3225/// \returns true if the declaration name violates these rules. 3226bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3227 DeclarationNameInfo NameInfo) { 3228 DeclarationName Name = NameInfo.getName(); 3229 3230 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3231 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3232 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3233 return true; 3234 } 3235 3236 return false; 3237} 3238 3239/// \brief Diagnose a declaration that has a qualified name within a class, 3240/// which is ill-formed but often recoverable. 3241/// 3242/// \returns true if we cannot safely recover from this error, false otherwise. 3243bool Sema::diagnoseQualifiedDeclInClass(CXXScopeSpec &SS, DeclContext *DC, 3244 DeclarationName Name, 3245 SourceLocation Loc) { 3246 // The user provided a superfluous scope specifier inside a class 3247 // definition: 3248 // 3249 // class X { 3250 // void X::f(); 3251 // }; 3252 if (CurContext->Equals(DC)) { 3253 Diag(Loc, diag::warn_member_extra_qualification) 3254 << Name << FixItHint::CreateRemoval(SS.getRange()); 3255 SS.clear(); 3256 return false; 3257 } 3258 3259 Diag(Loc, diag::err_member_qualification) 3260 << Name << SS.getRange(); 3261 SS.clear(); 3262 3263 // C++ constructors and destructors with incorrect scopes can break 3264 // our AST invariants by having the wrong underlying types. If 3265 // that's the case, then drop this declaration entirely. 3266 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3267 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3268 !Context.hasSameType(Name.getCXXNameType(), 3269 Context.getTypeDeclType( 3270 cast<CXXRecordDecl>(CurContext)))) 3271 return true; 3272 3273 return false; 3274} 3275 3276Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3277 MultiTemplateParamsArg TemplateParamLists) { 3278 // TODO: consider using NameInfo for diagnostic. 3279 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3280 DeclarationName Name = NameInfo.getName(); 3281 3282 // All of these full declarators require an identifier. If it doesn't have 3283 // one, the ParsedFreeStandingDeclSpec action should be used. 3284 if (!Name) { 3285 if (!D.isInvalidType()) // Reject this if we think it is valid. 3286 Diag(D.getDeclSpec().getLocStart(), 3287 diag::err_declarator_need_ident) 3288 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3289 return 0; 3290 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3291 return 0; 3292 3293 // The scope passed in may not be a decl scope. Zip up the scope tree until 3294 // we find one that is. 3295 while ((S->getFlags() & Scope::DeclScope) == 0 || 3296 (S->getFlags() & Scope::TemplateParamScope) != 0) 3297 S = S->getParent(); 3298 3299 DeclContext *DC = CurContext; 3300 if (D.getCXXScopeSpec().isInvalid()) 3301 D.setInvalidType(); 3302 else if (D.getCXXScopeSpec().isSet()) { 3303 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3304 UPPC_DeclarationQualifier)) 3305 return 0; 3306 3307 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3308 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3309 if (!DC) { 3310 // If we could not compute the declaration context, it's because the 3311 // declaration context is dependent but does not refer to a class, 3312 // class template, or class template partial specialization. Complain 3313 // and return early, to avoid the coming semantic disaster. 3314 Diag(D.getIdentifierLoc(), 3315 diag::err_template_qualified_declarator_no_match) 3316 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3317 << D.getCXXScopeSpec().getRange(); 3318 return 0; 3319 } 3320 bool IsDependentContext = DC->isDependentContext(); 3321 3322 if (!IsDependentContext && 3323 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3324 return 0; 3325 3326 if (isa<CXXRecordDecl>(DC)) { 3327 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3328 Diag(D.getIdentifierLoc(), 3329 diag::err_member_def_undefined_record) 3330 << Name << DC << D.getCXXScopeSpec().getRange(); 3331 D.setInvalidType(); 3332 } else if (isa<CXXRecordDecl>(CurContext) && 3333 !D.getDeclSpec().isFriendSpecified()) { 3334 if (diagnoseQualifiedDeclInClass(D.getCXXScopeSpec(), DC, 3335 Name, D.getIdentifierLoc())) 3336 return 0; 3337 } 3338 } 3339 3340 // Check whether we need to rebuild the type of the given 3341 // declaration in the current instantiation. 3342 if (EnteringContext && IsDependentContext && 3343 TemplateParamLists.size() != 0) { 3344 ContextRAII SavedContext(*this, DC); 3345 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3346 D.setInvalidType(); 3347 } 3348 } 3349 3350 if (DiagnoseClassNameShadow(DC, NameInfo)) 3351 // If this is a typedef, we'll end up spewing multiple diagnostics. 3352 // Just return early; it's safer. 3353 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3354 return 0; 3355 3356 NamedDecl *New; 3357 3358 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3359 QualType R = TInfo->getType(); 3360 3361 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3362 UPPC_DeclarationType)) 3363 D.setInvalidType(); 3364 3365 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3366 ForRedeclaration); 3367 3368 // See if this is a redefinition of a variable in the same scope. 3369 if (!D.getCXXScopeSpec().isSet()) { 3370 bool IsLinkageLookup = false; 3371 3372 // If the declaration we're planning to build will be a function 3373 // or object with linkage, then look for another declaration with 3374 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3375 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3376 /* Do nothing*/; 3377 else if (R->isFunctionType()) { 3378 if (CurContext->isFunctionOrMethod() || 3379 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3380 IsLinkageLookup = true; 3381 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3382 IsLinkageLookup = true; 3383 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3384 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3385 IsLinkageLookup = true; 3386 3387 if (IsLinkageLookup) 3388 Previous.clear(LookupRedeclarationWithLinkage); 3389 3390 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3391 } else { // Something like "int foo::x;" 3392 LookupQualifiedName(Previous, DC); 3393 3394 // Don't consider using declarations as previous declarations for 3395 // out-of-line members. 3396 RemoveUsingDecls(Previous); 3397 3398 // C++ 7.3.1.2p2: 3399 // Members (including explicit specializations of templates) of a named 3400 // namespace can also be defined outside that namespace by explicit 3401 // qualification of the name being defined, provided that the entity being 3402 // defined was already declared in the namespace and the definition appears 3403 // after the point of declaration in a namespace that encloses the 3404 // declarations namespace. 3405 // 3406 // Note that we only check the context at this point. We don't yet 3407 // have enough information to make sure that PrevDecl is actually 3408 // the declaration we want to match. For example, given: 3409 // 3410 // class X { 3411 // void f(); 3412 // void f(float); 3413 // }; 3414 // 3415 // void X::f(int) { } // ill-formed 3416 // 3417 // In this case, PrevDecl will point to the overload set 3418 // containing the two f's declared in X, but neither of them 3419 // matches. 3420 3421 // First check whether we named the global scope. 3422 if (isa<TranslationUnitDecl>(DC)) { 3423 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3424 << Name << D.getCXXScopeSpec().getRange(); 3425 } else { 3426 DeclContext *Cur = CurContext; 3427 while (isa<LinkageSpecDecl>(Cur)) 3428 Cur = Cur->getParent(); 3429 if (!Cur->Encloses(DC)) { 3430 // The qualifying scope doesn't enclose the original declaration. 3431 // Emit diagnostic based on current scope. 3432 SourceLocation L = D.getIdentifierLoc(); 3433 SourceRange R = D.getCXXScopeSpec().getRange(); 3434 if (isa<FunctionDecl>(Cur)) 3435 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3436 else 3437 Diag(L, diag::err_invalid_declarator_scope) 3438 << Name << cast<NamedDecl>(DC) << R; 3439 D.setInvalidType(); 3440 } 3441 3442 // C++11 8.3p1: 3443 // ... "The nested-name-specifier of the qualified declarator-id shall 3444 // not begin with a decltype-specifer" 3445 NestedNameSpecifierLoc SpecLoc = 3446 D.getCXXScopeSpec().getWithLocInContext(Context); 3447 assert(SpecLoc && "A non-empty CXXScopeSpec should have a non-empty " 3448 "NestedNameSpecifierLoc"); 3449 while (SpecLoc.getPrefix()) 3450 SpecLoc = SpecLoc.getPrefix(); 3451 if (dyn_cast_or_null<DecltypeType>( 3452 SpecLoc.getNestedNameSpecifier()->getAsType())) 3453 Diag(SpecLoc.getBeginLoc(), diag::err_decltype_in_declarator) 3454 << SpecLoc.getTypeLoc().getSourceRange(); 3455 } 3456 } 3457 3458 if (Previous.isSingleResult() && 3459 Previous.getFoundDecl()->isTemplateParameter()) { 3460 // Maybe we will complain about the shadowed template parameter. 3461 if (!D.isInvalidType()) 3462 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3463 Previous.getFoundDecl()); 3464 3465 // Just pretend that we didn't see the previous declaration. 3466 Previous.clear(); 3467 } 3468 3469 // In C++, the previous declaration we find might be a tag type 3470 // (class or enum). In this case, the new declaration will hide the 3471 // tag type. Note that this does does not apply if we're declaring a 3472 // typedef (C++ [dcl.typedef]p4). 3473 if (Previous.isSingleTagDecl() && 3474 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3475 Previous.clear(); 3476 3477 bool AddToScope = true; 3478 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3479 if (TemplateParamLists.size()) { 3480 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3481 return 0; 3482 } 3483 3484 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3485 } else if (R->isFunctionType()) { 3486 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3487 move(TemplateParamLists), 3488 AddToScope); 3489 } else { 3490 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3491 move(TemplateParamLists)); 3492 } 3493 3494 if (New == 0) 3495 return 0; 3496 3497 // If this has an identifier and is not an invalid redeclaration or 3498 // function template specialization, add it to the scope stack. 3499 if (New->getDeclName() && AddToScope && 3500 !(D.isRedeclaration() && New->isInvalidDecl())) 3501 PushOnScopeChains(New, S); 3502 3503 return New; 3504} 3505 3506/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3507/// types into constant array types in certain situations which would otherwise 3508/// be errors (for GCC compatibility). 3509static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3510 ASTContext &Context, 3511 bool &SizeIsNegative, 3512 llvm::APSInt &Oversized) { 3513 // This method tries to turn a variable array into a constant 3514 // array even when the size isn't an ICE. This is necessary 3515 // for compatibility with code that depends on gcc's buggy 3516 // constant expression folding, like struct {char x[(int)(char*)2];} 3517 SizeIsNegative = false; 3518 Oversized = 0; 3519 3520 if (T->isDependentType()) 3521 return QualType(); 3522 3523 QualifierCollector Qs; 3524 const Type *Ty = Qs.strip(T); 3525 3526 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3527 QualType Pointee = PTy->getPointeeType(); 3528 QualType FixedType = 3529 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3530 Oversized); 3531 if (FixedType.isNull()) return FixedType; 3532 FixedType = Context.getPointerType(FixedType); 3533 return Qs.apply(Context, FixedType); 3534 } 3535 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3536 QualType Inner = PTy->getInnerType(); 3537 QualType FixedType = 3538 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3539 Oversized); 3540 if (FixedType.isNull()) return FixedType; 3541 FixedType = Context.getParenType(FixedType); 3542 return Qs.apply(Context, FixedType); 3543 } 3544 3545 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3546 if (!VLATy) 3547 return QualType(); 3548 // FIXME: We should probably handle this case 3549 if (VLATy->getElementType()->isVariablyModifiedType()) 3550 return QualType(); 3551 3552 llvm::APSInt Res; 3553 if (!VLATy->getSizeExpr() || 3554 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3555 return QualType(); 3556 3557 // Check whether the array size is negative. 3558 if (Res.isSigned() && Res.isNegative()) { 3559 SizeIsNegative = true; 3560 return QualType(); 3561 } 3562 3563 // Check whether the array is too large to be addressed. 3564 unsigned ActiveSizeBits 3565 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3566 Res); 3567 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3568 Oversized = Res; 3569 return QualType(); 3570 } 3571 3572 return Context.getConstantArrayType(VLATy->getElementType(), 3573 Res, ArrayType::Normal, 0); 3574} 3575 3576/// \brief Register the given locally-scoped external C declaration so 3577/// that it can be found later for redeclarations 3578void 3579Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3580 const LookupResult &Previous, 3581 Scope *S) { 3582 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3583 "Decl is not a locally-scoped decl!"); 3584 // Note that we have a locally-scoped external with this name. 3585 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3586 3587 if (!Previous.isSingleResult()) 3588 return; 3589 3590 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3591 3592 // If there was a previous declaration of this variable, it may be 3593 // in our identifier chain. Update the identifier chain with the new 3594 // declaration. 3595 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3596 // The previous declaration was found on the identifer resolver 3597 // chain, so remove it from its scope. 3598 3599 if (S->isDeclScope(PrevDecl)) { 3600 // Special case for redeclarations in the SAME scope. 3601 // Because this declaration is going to be added to the identifier chain 3602 // later, we should temporarily take it OFF the chain. 3603 IdResolver.RemoveDecl(ND); 3604 3605 } else { 3606 // Find the scope for the original declaration. 3607 while (S && !S->isDeclScope(PrevDecl)) 3608 S = S->getParent(); 3609 } 3610 3611 if (S) 3612 S->RemoveDecl(PrevDecl); 3613 } 3614} 3615 3616llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3617Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3618 if (ExternalSource) { 3619 // Load locally-scoped external decls from the external source. 3620 SmallVector<NamedDecl *, 4> Decls; 3621 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3622 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3623 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3624 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3625 if (Pos == LocallyScopedExternalDecls.end()) 3626 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3627 } 3628 } 3629 3630 return LocallyScopedExternalDecls.find(Name); 3631} 3632 3633/// \brief Diagnose function specifiers on a declaration of an identifier that 3634/// does not identify a function. 3635void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3636 // FIXME: We should probably indicate the identifier in question to avoid 3637 // confusion for constructs like "inline int a(), b;" 3638 if (D.getDeclSpec().isInlineSpecified()) 3639 Diag(D.getDeclSpec().getInlineSpecLoc(), 3640 diag::err_inline_non_function); 3641 3642 if (D.getDeclSpec().isVirtualSpecified()) 3643 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3644 diag::err_virtual_non_function); 3645 3646 if (D.getDeclSpec().isExplicitSpecified()) 3647 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3648 diag::err_explicit_non_function); 3649} 3650 3651NamedDecl* 3652Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3653 TypeSourceInfo *TInfo, LookupResult &Previous) { 3654 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3655 if (D.getCXXScopeSpec().isSet()) { 3656 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3657 << D.getCXXScopeSpec().getRange(); 3658 D.setInvalidType(); 3659 // Pretend we didn't see the scope specifier. 3660 DC = CurContext; 3661 Previous.clear(); 3662 } 3663 3664 if (getLangOpts().CPlusPlus) { 3665 // Check that there are no default arguments (C++ only). 3666 CheckExtraCXXDefaultArguments(D); 3667 } 3668 3669 DiagnoseFunctionSpecifiers(D); 3670 3671 if (D.getDeclSpec().isThreadSpecified()) 3672 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3673 if (D.getDeclSpec().isConstexprSpecified()) 3674 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3675 << 1; 3676 3677 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3678 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3679 << D.getName().getSourceRange(); 3680 return 0; 3681 } 3682 3683 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3684 if (!NewTD) return 0; 3685 3686 // Handle attributes prior to checking for duplicates in MergeVarDecl 3687 ProcessDeclAttributes(S, NewTD, D); 3688 3689 CheckTypedefForVariablyModifiedType(S, NewTD); 3690 3691 bool Redeclaration = D.isRedeclaration(); 3692 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3693 D.setRedeclaration(Redeclaration); 3694 return ND; 3695} 3696 3697void 3698Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3699 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3700 // then it shall have block scope. 3701 // Note that variably modified types must be fixed before merging the decl so 3702 // that redeclarations will match. 3703 QualType T = NewTD->getUnderlyingType(); 3704 if (T->isVariablyModifiedType()) { 3705 getCurFunction()->setHasBranchProtectedScope(); 3706 3707 if (S->getFnParent() == 0) { 3708 bool SizeIsNegative; 3709 llvm::APSInt Oversized; 3710 QualType FixedTy = 3711 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3712 Oversized); 3713 if (!FixedTy.isNull()) { 3714 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3715 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3716 } else { 3717 if (SizeIsNegative) 3718 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3719 else if (T->isVariableArrayType()) 3720 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3721 else if (Oversized.getBoolValue()) 3722 Diag(NewTD->getLocation(), diag::err_array_too_large) 3723 << Oversized.toString(10); 3724 else 3725 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3726 NewTD->setInvalidDecl(); 3727 } 3728 } 3729 } 3730} 3731 3732 3733/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3734/// declares a typedef-name, either using the 'typedef' type specifier or via 3735/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3736NamedDecl* 3737Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3738 LookupResult &Previous, bool &Redeclaration) { 3739 // Merge the decl with the existing one if appropriate. If the decl is 3740 // in an outer scope, it isn't the same thing. 3741 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3742 /*ExplicitInstantiationOrSpecialization=*/false); 3743 if (!Previous.empty()) { 3744 Redeclaration = true; 3745 MergeTypedefNameDecl(NewTD, Previous); 3746 } 3747 3748 // If this is the C FILE type, notify the AST context. 3749 if (IdentifierInfo *II = NewTD->getIdentifier()) 3750 if (!NewTD->isInvalidDecl() && 3751 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3752 if (II->isStr("FILE")) 3753 Context.setFILEDecl(NewTD); 3754 else if (II->isStr("jmp_buf")) 3755 Context.setjmp_bufDecl(NewTD); 3756 else if (II->isStr("sigjmp_buf")) 3757 Context.setsigjmp_bufDecl(NewTD); 3758 else if (II->isStr("ucontext_t")) 3759 Context.setucontext_tDecl(NewTD); 3760 else if (II->isStr("__builtin_va_list")) 3761 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3762 } 3763 3764 return NewTD; 3765} 3766 3767/// \brief Determines whether the given declaration is an out-of-scope 3768/// previous declaration. 3769/// 3770/// This routine should be invoked when name lookup has found a 3771/// previous declaration (PrevDecl) that is not in the scope where a 3772/// new declaration by the same name is being introduced. If the new 3773/// declaration occurs in a local scope, previous declarations with 3774/// linkage may still be considered previous declarations (C99 3775/// 6.2.2p4-5, C++ [basic.link]p6). 3776/// 3777/// \param PrevDecl the previous declaration found by name 3778/// lookup 3779/// 3780/// \param DC the context in which the new declaration is being 3781/// declared. 3782/// 3783/// \returns true if PrevDecl is an out-of-scope previous declaration 3784/// for a new delcaration with the same name. 3785static bool 3786isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3787 ASTContext &Context) { 3788 if (!PrevDecl) 3789 return false; 3790 3791 if (!PrevDecl->hasLinkage()) 3792 return false; 3793 3794 if (Context.getLangOpts().CPlusPlus) { 3795 // C++ [basic.link]p6: 3796 // If there is a visible declaration of an entity with linkage 3797 // having the same name and type, ignoring entities declared 3798 // outside the innermost enclosing namespace scope, the block 3799 // scope declaration declares that same entity and receives the 3800 // linkage of the previous declaration. 3801 DeclContext *OuterContext = DC->getRedeclContext(); 3802 if (!OuterContext->isFunctionOrMethod()) 3803 // This rule only applies to block-scope declarations. 3804 return false; 3805 3806 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3807 if (PrevOuterContext->isRecord()) 3808 // We found a member function: ignore it. 3809 return false; 3810 3811 // Find the innermost enclosing namespace for the new and 3812 // previous declarations. 3813 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3814 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3815 3816 // The previous declaration is in a different namespace, so it 3817 // isn't the same function. 3818 if (!OuterContext->Equals(PrevOuterContext)) 3819 return false; 3820 } 3821 3822 return true; 3823} 3824 3825static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3826 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3827 if (!SS.isSet()) return; 3828 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3829} 3830 3831bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3832 QualType type = decl->getType(); 3833 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3834 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3835 // Various kinds of declaration aren't allowed to be __autoreleasing. 3836 unsigned kind = -1U; 3837 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3838 if (var->hasAttr<BlocksAttr>()) 3839 kind = 0; // __block 3840 else if (!var->hasLocalStorage()) 3841 kind = 1; // global 3842 } else if (isa<ObjCIvarDecl>(decl)) { 3843 kind = 3; // ivar 3844 } else if (isa<FieldDecl>(decl)) { 3845 kind = 2; // field 3846 } 3847 3848 if (kind != -1U) { 3849 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3850 << kind; 3851 } 3852 } else if (lifetime == Qualifiers::OCL_None) { 3853 // Try to infer lifetime. 3854 if (!type->isObjCLifetimeType()) 3855 return false; 3856 3857 lifetime = type->getObjCARCImplicitLifetime(); 3858 type = Context.getLifetimeQualifiedType(type, lifetime); 3859 decl->setType(type); 3860 } 3861 3862 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3863 // Thread-local variables cannot have lifetime. 3864 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3865 var->isThreadSpecified()) { 3866 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3867 << var->getType(); 3868 return true; 3869 } 3870 } 3871 3872 return false; 3873} 3874 3875NamedDecl* 3876Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3877 TypeSourceInfo *TInfo, LookupResult &Previous, 3878 MultiTemplateParamsArg TemplateParamLists) { 3879 QualType R = TInfo->getType(); 3880 DeclarationName Name = GetNameForDeclarator(D).getName(); 3881 3882 // Check that there are no default arguments (C++ only). 3883 if (getLangOpts().CPlusPlus) 3884 CheckExtraCXXDefaultArguments(D); 3885 3886 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3887 assert(SCSpec != DeclSpec::SCS_typedef && 3888 "Parser allowed 'typedef' as storage class VarDecl."); 3889 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3890 if (SCSpec == DeclSpec::SCS_mutable) { 3891 // mutable can only appear on non-static class members, so it's always 3892 // an error here 3893 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3894 D.setInvalidType(); 3895 SC = SC_None; 3896 } 3897 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3898 VarDecl::StorageClass SCAsWritten 3899 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3900 3901 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3902 if (!II) { 3903 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3904 << Name; 3905 return 0; 3906 } 3907 3908 DiagnoseFunctionSpecifiers(D); 3909 3910 if (!DC->isRecord() && S->getFnParent() == 0) { 3911 // C99 6.9p2: The storage-class specifiers auto and register shall not 3912 // appear in the declaration specifiers in an external declaration. 3913 if (SC == SC_Auto || SC == SC_Register) { 3914 3915 // If this is a register variable with an asm label specified, then this 3916 // is a GNU extension. 3917 if (SC == SC_Register && D.getAsmLabel()) 3918 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3919 else 3920 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3921 D.setInvalidType(); 3922 } 3923 } 3924 3925 if (getLangOpts().OpenCL) { 3926 // Set up the special work-group-local storage class for variables in the 3927 // OpenCL __local address space. 3928 if (R.getAddressSpace() == LangAS::opencl_local) 3929 SC = SC_OpenCLWorkGroupLocal; 3930 } 3931 3932 bool isExplicitSpecialization = false; 3933 VarDecl *NewVD; 3934 if (!getLangOpts().CPlusPlus) { 3935 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 3936 D.getIdentifierLoc(), II, 3937 R, TInfo, SC, SCAsWritten); 3938 3939 if (D.isInvalidType()) 3940 NewVD->setInvalidDecl(); 3941 } else { 3942 if (DC->isRecord() && !CurContext->isRecord()) { 3943 // This is an out-of-line definition of a static data member. 3944 if (SC == SC_Static) { 3945 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3946 diag::err_static_out_of_line) 3947 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3948 } else if (SC == SC_None) 3949 SC = SC_Static; 3950 } 3951 if (SC == SC_Static && CurContext->isRecord()) { 3952 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3953 if (RD->isLocalClass()) 3954 Diag(D.getIdentifierLoc(), 3955 diag::err_static_data_member_not_allowed_in_local_class) 3956 << Name << RD->getDeclName(); 3957 3958 // C++98 [class.union]p1: If a union contains a static data member, 3959 // the program is ill-formed. C++11 drops this restriction. 3960 if (RD->isUnion()) 3961 Diag(D.getIdentifierLoc(), 3962 getLangOpts().CPlusPlus0x 3963 ? diag::warn_cxx98_compat_static_data_member_in_union 3964 : diag::ext_static_data_member_in_union) << Name; 3965 // We conservatively disallow static data members in anonymous structs. 3966 else if (!RD->getDeclName()) 3967 Diag(D.getIdentifierLoc(), 3968 diag::err_static_data_member_not_allowed_in_anon_struct) 3969 << Name << RD->isUnion(); 3970 } 3971 } 3972 3973 // Match up the template parameter lists with the scope specifier, then 3974 // determine whether we have a template or a template specialization. 3975 isExplicitSpecialization = false; 3976 bool Invalid = false; 3977 if (TemplateParameterList *TemplateParams 3978 = MatchTemplateParametersToScopeSpecifier( 3979 D.getDeclSpec().getLocStart(), 3980 D.getIdentifierLoc(), 3981 D.getCXXScopeSpec(), 3982 TemplateParamLists.get(), 3983 TemplateParamLists.size(), 3984 /*never a friend*/ false, 3985 isExplicitSpecialization, 3986 Invalid)) { 3987 if (TemplateParams->size() > 0) { 3988 // There is no such thing as a variable template. 3989 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3990 << II 3991 << SourceRange(TemplateParams->getTemplateLoc(), 3992 TemplateParams->getRAngleLoc()); 3993 return 0; 3994 } else { 3995 // There is an extraneous 'template<>' for this variable. Complain 3996 // about it, but allow the declaration of the variable. 3997 Diag(TemplateParams->getTemplateLoc(), 3998 diag::err_template_variable_noparams) 3999 << II 4000 << SourceRange(TemplateParams->getTemplateLoc(), 4001 TemplateParams->getRAngleLoc()); 4002 } 4003 } 4004 4005 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 4006 D.getIdentifierLoc(), II, 4007 R, TInfo, SC, SCAsWritten); 4008 4009 // If this decl has an auto type in need of deduction, make a note of the 4010 // Decl so we can diagnose uses of it in its own initializer. 4011 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 4012 R->getContainedAutoType()) 4013 ParsingInitForAutoVars.insert(NewVD); 4014 4015 if (D.isInvalidType() || Invalid) 4016 NewVD->setInvalidDecl(); 4017 4018 SetNestedNameSpecifier(NewVD, D); 4019 4020 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 4021 NewVD->setTemplateParameterListsInfo(Context, 4022 TemplateParamLists.size(), 4023 TemplateParamLists.release()); 4024 } 4025 4026 if (D.getDeclSpec().isConstexprSpecified()) 4027 NewVD->setConstexpr(true); 4028 } 4029 4030 // Set the lexical context. If the declarator has a C++ scope specifier, the 4031 // lexical context will be different from the semantic context. 4032 NewVD->setLexicalDeclContext(CurContext); 4033 4034 if (D.getDeclSpec().isThreadSpecified()) { 4035 if (NewVD->hasLocalStorage()) 4036 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 4037 else if (!Context.getTargetInfo().isTLSSupported()) 4038 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 4039 else 4040 NewVD->setThreadSpecified(true); 4041 } 4042 4043 if (D.getDeclSpec().isModulePrivateSpecified()) { 4044 if (isExplicitSpecialization) 4045 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 4046 << 2 4047 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4048 else if (NewVD->hasLocalStorage()) 4049 Diag(NewVD->getLocation(), diag::err_module_private_local) 4050 << 0 << NewVD->getDeclName() 4051 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 4052 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4053 else 4054 NewVD->setModulePrivate(); 4055 } 4056 4057 // Handle attributes prior to checking for duplicates in MergeVarDecl 4058 ProcessDeclAttributes(S, NewVD, D); 4059 4060 // In auto-retain/release, infer strong retension for variables of 4061 // retainable type. 4062 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4063 NewVD->setInvalidDecl(); 4064 4065 // Handle GNU asm-label extension (encoded as an attribute). 4066 if (Expr *E = (Expr*)D.getAsmLabel()) { 4067 // The parser guarantees this is a string. 4068 StringLiteral *SE = cast<StringLiteral>(E); 4069 StringRef Label = SE->getString(); 4070 if (S->getFnParent() != 0) { 4071 switch (SC) { 4072 case SC_None: 4073 case SC_Auto: 4074 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4075 break; 4076 case SC_Register: 4077 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4078 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4079 break; 4080 case SC_Static: 4081 case SC_Extern: 4082 case SC_PrivateExtern: 4083 case SC_OpenCLWorkGroupLocal: 4084 break; 4085 } 4086 } 4087 4088 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4089 Context, Label)); 4090 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 4091 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 4092 ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier()); 4093 if (I != ExtnameUndeclaredIdentifiers.end()) { 4094 NewVD->addAttr(I->second); 4095 ExtnameUndeclaredIdentifiers.erase(I); 4096 } 4097 } 4098 4099 // Diagnose shadowed variables before filtering for scope. 4100 if (!D.getCXXScopeSpec().isSet()) 4101 CheckShadow(S, NewVD, Previous); 4102 4103 // Don't consider existing declarations that are in a different 4104 // scope and are out-of-semantic-context declarations (if the new 4105 // declaration has linkage). 4106 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4107 isExplicitSpecialization); 4108 4109 if (!getLangOpts().CPlusPlus) { 4110 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4111 } else { 4112 // Merge the decl with the existing one if appropriate. 4113 if (!Previous.empty()) { 4114 if (Previous.isSingleResult() && 4115 isa<FieldDecl>(Previous.getFoundDecl()) && 4116 D.getCXXScopeSpec().isSet()) { 4117 // The user tried to define a non-static data member 4118 // out-of-line (C++ [dcl.meaning]p1). 4119 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4120 << D.getCXXScopeSpec().getRange(); 4121 Previous.clear(); 4122 NewVD->setInvalidDecl(); 4123 } 4124 } else if (D.getCXXScopeSpec().isSet()) { 4125 // No previous declaration in the qualifying scope. 4126 Diag(D.getIdentifierLoc(), diag::err_no_member) 4127 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4128 << D.getCXXScopeSpec().getRange(); 4129 NewVD->setInvalidDecl(); 4130 } 4131 4132 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4133 4134 // This is an explicit specialization of a static data member. Check it. 4135 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4136 CheckMemberSpecialization(NewVD, Previous)) 4137 NewVD->setInvalidDecl(); 4138 } 4139 4140 // attributes declared post-definition are currently ignored 4141 // FIXME: This should be handled in attribute merging, not 4142 // here. 4143 if (Previous.isSingleResult()) { 4144 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4145 if (Def && (Def = Def->getDefinition()) && 4146 Def != NewVD && D.hasAttributes()) { 4147 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4148 Diag(Def->getLocation(), diag::note_previous_definition); 4149 } 4150 } 4151 4152 // If this is a locally-scoped extern C variable, update the map of 4153 // such variables. 4154 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4155 !NewVD->isInvalidDecl()) 4156 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4157 4158 // If there's a #pragma GCC visibility in scope, and this isn't a class 4159 // member, set the visibility of this variable. 4160 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4161 AddPushedVisibilityAttribute(NewVD); 4162 4163 MarkUnusedFileScopedDecl(NewVD); 4164 4165 return NewVD; 4166} 4167 4168/// \brief Diagnose variable or built-in function shadowing. Implements 4169/// -Wshadow. 4170/// 4171/// This method is called whenever a VarDecl is added to a "useful" 4172/// scope. 4173/// 4174/// \param S the scope in which the shadowing name is being declared 4175/// \param R the lookup of the name 4176/// 4177void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4178 // Return if warning is ignored. 4179 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4180 DiagnosticsEngine::Ignored) 4181 return; 4182 4183 // Don't diagnose declarations at file scope. 4184 if (D->hasGlobalStorage()) 4185 return; 4186 4187 DeclContext *NewDC = D->getDeclContext(); 4188 4189 // Only diagnose if we're shadowing an unambiguous field or variable. 4190 if (R.getResultKind() != LookupResult::Found) 4191 return; 4192 4193 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4194 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4195 return; 4196 4197 // Fields are not shadowed by variables in C++ static methods. 4198 if (isa<FieldDecl>(ShadowedDecl)) 4199 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4200 if (MD->isStatic()) 4201 return; 4202 4203 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4204 if (shadowedVar->isExternC()) { 4205 // For shadowing external vars, make sure that we point to the global 4206 // declaration, not a locally scoped extern declaration. 4207 for (VarDecl::redecl_iterator 4208 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4209 I != E; ++I) 4210 if (I->isFileVarDecl()) { 4211 ShadowedDecl = *I; 4212 break; 4213 } 4214 } 4215 4216 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4217 4218 // Only warn about certain kinds of shadowing for class members. 4219 if (NewDC && NewDC->isRecord()) { 4220 // In particular, don't warn about shadowing non-class members. 4221 if (!OldDC->isRecord()) 4222 return; 4223 4224 // TODO: should we warn about static data members shadowing 4225 // static data members from base classes? 4226 4227 // TODO: don't diagnose for inaccessible shadowed members. 4228 // This is hard to do perfectly because we might friend the 4229 // shadowing context, but that's just a false negative. 4230 } 4231 4232 // Determine what kind of declaration we're shadowing. 4233 unsigned Kind; 4234 if (isa<RecordDecl>(OldDC)) { 4235 if (isa<FieldDecl>(ShadowedDecl)) 4236 Kind = 3; // field 4237 else 4238 Kind = 2; // static data member 4239 } else if (OldDC->isFileContext()) 4240 Kind = 1; // global 4241 else 4242 Kind = 0; // local 4243 4244 DeclarationName Name = R.getLookupName(); 4245 4246 // Emit warning and note. 4247 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4248 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4249} 4250 4251/// \brief Check -Wshadow without the advantage of a previous lookup. 4252void Sema::CheckShadow(Scope *S, VarDecl *D) { 4253 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4254 DiagnosticsEngine::Ignored) 4255 return; 4256 4257 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4258 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4259 LookupName(R, S); 4260 CheckShadow(S, D, R); 4261} 4262 4263/// \brief Perform semantic checking on a newly-created variable 4264/// declaration. 4265/// 4266/// This routine performs all of the type-checking required for a 4267/// variable declaration once it has been built. It is used both to 4268/// check variables after they have been parsed and their declarators 4269/// have been translated into a declaration, and to check variables 4270/// that have been instantiated from a template. 4271/// 4272/// Sets NewVD->isInvalidDecl() if an error was encountered. 4273/// 4274/// Returns true if the variable declaration is a redeclaration. 4275bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4276 LookupResult &Previous) { 4277 // If the decl is already known invalid, don't check it. 4278 if (NewVD->isInvalidDecl()) 4279 return false; 4280 4281 QualType T = NewVD->getType(); 4282 4283 if (T->isObjCObjectType()) { 4284 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4285 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4286 T = Context.getObjCObjectPointerType(T); 4287 NewVD->setType(T); 4288 } 4289 4290 // Emit an error if an address space was applied to decl with local storage. 4291 // This includes arrays of objects with address space qualifiers, but not 4292 // automatic variables that point to other address spaces. 4293 // ISO/IEC TR 18037 S5.1.2 4294 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4295 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4296 NewVD->setInvalidDecl(); 4297 return false; 4298 } 4299 4300 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4301 && !NewVD->hasAttr<BlocksAttr>()) { 4302 if (getLangOpts().getGC() != LangOptions::NonGC) 4303 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4304 else 4305 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4306 } 4307 4308 bool isVM = T->isVariablyModifiedType(); 4309 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4310 NewVD->hasAttr<BlocksAttr>()) 4311 getCurFunction()->setHasBranchProtectedScope(); 4312 4313 if ((isVM && NewVD->hasLinkage()) || 4314 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4315 bool SizeIsNegative; 4316 llvm::APSInt Oversized; 4317 QualType FixedTy = 4318 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4319 Oversized); 4320 4321 if (FixedTy.isNull() && T->isVariableArrayType()) { 4322 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4323 // FIXME: This won't give the correct result for 4324 // int a[10][n]; 4325 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4326 4327 if (NewVD->isFileVarDecl()) 4328 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4329 << SizeRange; 4330 else if (NewVD->getStorageClass() == SC_Static) 4331 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4332 << SizeRange; 4333 else 4334 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4335 << SizeRange; 4336 NewVD->setInvalidDecl(); 4337 return false; 4338 } 4339 4340 if (FixedTy.isNull()) { 4341 if (NewVD->isFileVarDecl()) 4342 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4343 else 4344 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4345 NewVD->setInvalidDecl(); 4346 return false; 4347 } 4348 4349 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4350 NewVD->setType(FixedTy); 4351 } 4352 4353 if (Previous.empty() && NewVD->isExternC()) { 4354 // Since we did not find anything by this name and we're declaring 4355 // an extern "C" variable, look for a non-visible extern "C" 4356 // declaration with the same name. 4357 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4358 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4359 if (Pos != LocallyScopedExternalDecls.end()) 4360 Previous.addDecl(Pos->second); 4361 } 4362 4363 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4364 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4365 << T; 4366 NewVD->setInvalidDecl(); 4367 return false; 4368 } 4369 4370 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4371 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4372 NewVD->setInvalidDecl(); 4373 return false; 4374 } 4375 4376 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4377 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4378 NewVD->setInvalidDecl(); 4379 return false; 4380 } 4381 4382 if (NewVD->isConstexpr() && !T->isDependentType() && 4383 RequireLiteralType(NewVD->getLocation(), T, 4384 PDiag(diag::err_constexpr_var_non_literal))) { 4385 NewVD->setInvalidDecl(); 4386 return false; 4387 } 4388 4389 if (!Previous.empty()) { 4390 MergeVarDecl(NewVD, Previous); 4391 return true; 4392 } 4393 return false; 4394} 4395 4396/// \brief Data used with FindOverriddenMethod 4397struct FindOverriddenMethodData { 4398 Sema *S; 4399 CXXMethodDecl *Method; 4400}; 4401 4402/// \brief Member lookup function that determines whether a given C++ 4403/// method overrides a method in a base class, to be used with 4404/// CXXRecordDecl::lookupInBases(). 4405static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4406 CXXBasePath &Path, 4407 void *UserData) { 4408 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4409 4410 FindOverriddenMethodData *Data 4411 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4412 4413 DeclarationName Name = Data->Method->getDeclName(); 4414 4415 // FIXME: Do we care about other names here too? 4416 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4417 // We really want to find the base class destructor here. 4418 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4419 CanQualType CT = Data->S->Context.getCanonicalType(T); 4420 4421 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4422 } 4423 4424 for (Path.Decls = BaseRecord->lookup(Name); 4425 Path.Decls.first != Path.Decls.second; 4426 ++Path.Decls.first) { 4427 NamedDecl *D = *Path.Decls.first; 4428 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4429 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4430 return true; 4431 } 4432 } 4433 4434 return false; 4435} 4436 4437/// AddOverriddenMethods - See if a method overrides any in the base classes, 4438/// and if so, check that it's a valid override and remember it. 4439bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4440 // Look for virtual methods in base classes that this method might override. 4441 CXXBasePaths Paths; 4442 FindOverriddenMethodData Data; 4443 Data.Method = MD; 4444 Data.S = this; 4445 bool AddedAny = false; 4446 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4447 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4448 E = Paths.found_decls_end(); I != E; ++I) { 4449 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4450 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4451 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4452 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4453 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4454 AddedAny = true; 4455 } 4456 } 4457 } 4458 } 4459 4460 return AddedAny; 4461} 4462 4463namespace { 4464 // Struct for holding all of the extra arguments needed by 4465 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4466 struct ActOnFDArgs { 4467 Scope *S; 4468 Declarator &D; 4469 MultiTemplateParamsArg TemplateParamLists; 4470 bool AddToScope; 4471 }; 4472} 4473 4474namespace { 4475 4476// Callback to only accept typo corrections that have a non-zero edit distance. 4477// Also only accept corrections that have the same parent decl. 4478class DifferentNameValidatorCCC : public CorrectionCandidateCallback { 4479 public: 4480 DifferentNameValidatorCCC(CXXRecordDecl *Parent) 4481 : ExpectedParent(Parent ? Parent->getCanonicalDecl() : 0) { 4482 // Don't allow any additional qualification. 4483 // FIXME: It would be nice to perform this additional qualification. 4484 // However, DiagnoseInvalidRedeclaration is unable to handle the 4485 // qualification, because it doesn't know how to pass the corrected 4486 // nested-name-specifier through to ActOnFunctionDeclarator. 4487 AllowAddedQualifier = false; 4488 } 4489 4490 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 4491 if (candidate.getEditDistance() == 0) 4492 return false; 4493 4494 if (CXXMethodDecl *MD = candidate.getCorrectionDeclAs<CXXMethodDecl>()) { 4495 CXXRecordDecl *Parent = MD->getParent(); 4496 return Parent && Parent->getCanonicalDecl() == ExpectedParent; 4497 } 4498 4499 return !ExpectedParent; 4500 } 4501 4502 private: 4503 CXXRecordDecl *ExpectedParent; 4504}; 4505 4506} 4507 4508/// \brief Generate diagnostics for an invalid function redeclaration. 4509/// 4510/// This routine handles generating the diagnostic messages for an invalid 4511/// function redeclaration, including finding possible similar declarations 4512/// or performing typo correction if there are no previous declarations with 4513/// the same name. 4514/// 4515/// Returns a NamedDecl iff typo correction was performed and substituting in 4516/// the new declaration name does not cause new errors. 4517static NamedDecl* DiagnoseInvalidRedeclaration( 4518 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4519 ActOnFDArgs &ExtraArgs) { 4520 NamedDecl *Result = NULL; 4521 DeclarationName Name = NewFD->getDeclName(); 4522 DeclContext *NewDC = NewFD->getDeclContext(); 4523 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4524 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4525 llvm::SmallVector<unsigned, 1> MismatchedParams; 4526 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4527 TypoCorrection Correction; 4528 bool isFriendDecl = (SemaRef.getLangOpts().CPlusPlus && 4529 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4530 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4531 : diag::err_member_def_does_not_match; 4532 4533 NewFD->setInvalidDecl(); 4534 SemaRef.LookupQualifiedName(Prev, NewDC); 4535 assert(!Prev.isAmbiguous() && 4536 "Cannot have an ambiguity in previous-declaration lookup"); 4537 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 4538 DifferentNameValidatorCCC Validator(MD ? MD->getParent() : 0); 4539 if (!Prev.empty()) { 4540 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4541 Func != FuncEnd; ++Func) { 4542 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4543 if (FD && 4544 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4545 // Add 1 to the index so that 0 can mean the mismatch didn't 4546 // involve a parameter 4547 unsigned ParamNum = 4548 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4549 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4550 } 4551 } 4552 // If the qualified name lookup yielded nothing, try typo correction 4553 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4554 Prev.getLookupKind(), 0, 0, 4555 Validator, NewDC))) { 4556 // Trap errors. 4557 Sema::SFINAETrap Trap(SemaRef); 4558 4559 // Set up everything for the call to ActOnFunctionDeclarator 4560 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4561 ExtraArgs.D.getIdentifierLoc()); 4562 Previous.clear(); 4563 Previous.setLookupName(Correction.getCorrection()); 4564 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4565 CDeclEnd = Correction.end(); 4566 CDecl != CDeclEnd; ++CDecl) { 4567 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4568 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4569 MismatchedParams)) { 4570 Previous.addDecl(FD); 4571 } 4572 } 4573 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4574 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4575 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4576 // eliminate the need for the parameter pack ExtraArgs. 4577 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4578 NewFD->getDeclContext(), 4579 NewFD->getTypeSourceInfo(), 4580 Previous, 4581 ExtraArgs.TemplateParamLists, 4582 ExtraArgs.AddToScope); 4583 if (Trap.hasErrorOccurred()) { 4584 // Pretend the typo correction never occurred 4585 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4586 ExtraArgs.D.getIdentifierLoc()); 4587 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4588 Previous.clear(); 4589 Previous.setLookupName(Name); 4590 Result = NULL; 4591 } else { 4592 for (LookupResult::iterator Func = Previous.begin(), 4593 FuncEnd = Previous.end(); 4594 Func != FuncEnd; ++Func) { 4595 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4596 NearMatches.push_back(std::make_pair(FD, 0)); 4597 } 4598 } 4599 if (NearMatches.empty()) { 4600 // Ignore the correction if it didn't yield any close FunctionDecl matches 4601 Correction = TypoCorrection(); 4602 } else { 4603 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4604 : diag::err_member_def_does_not_match_suggest; 4605 } 4606 } 4607 4608 if (Correction) 4609 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4610 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOpts()) 4611 << FixItHint::CreateReplacement( 4612 NewFD->getLocation(), 4613 Correction.getAsString(SemaRef.getLangOpts())); 4614 else 4615 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4616 << Name << NewDC << NewFD->getLocation(); 4617 4618 bool NewFDisConst = false; 4619 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4620 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4621 4622 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4623 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4624 NearMatch != NearMatchEnd; ++NearMatch) { 4625 FunctionDecl *FD = NearMatch->first; 4626 bool FDisConst = false; 4627 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4628 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4629 4630 if (unsigned Idx = NearMatch->second) { 4631 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4632 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4633 diag::note_member_def_close_param_match) 4634 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4635 } else if (Correction) { 4636 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4637 << Correction.getQuoted(SemaRef.getLangOpts()); 4638 } else if (FDisConst != NewFDisConst) { 4639 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4640 << NewFDisConst << FD->getSourceRange().getEnd(); 4641 } else 4642 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4643 } 4644 return Result; 4645} 4646 4647static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4648 Declarator &D) { 4649 switch (D.getDeclSpec().getStorageClassSpec()) { 4650 default: llvm_unreachable("Unknown storage class!"); 4651 case DeclSpec::SCS_auto: 4652 case DeclSpec::SCS_register: 4653 case DeclSpec::SCS_mutable: 4654 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4655 diag::err_typecheck_sclass_func); 4656 D.setInvalidType(); 4657 break; 4658 case DeclSpec::SCS_unspecified: break; 4659 case DeclSpec::SCS_extern: return SC_Extern; 4660 case DeclSpec::SCS_static: { 4661 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4662 // C99 6.7.1p5: 4663 // The declaration of an identifier for a function that has 4664 // block scope shall have no explicit storage-class specifier 4665 // other than extern 4666 // See also (C++ [dcl.stc]p4). 4667 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4668 diag::err_static_block_func); 4669 break; 4670 } else 4671 return SC_Static; 4672 } 4673 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4674 } 4675 4676 // No explicit storage class has already been returned 4677 return SC_None; 4678} 4679 4680static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4681 DeclContext *DC, QualType &R, 4682 TypeSourceInfo *TInfo, 4683 FunctionDecl::StorageClass SC, 4684 bool &IsVirtualOkay) { 4685 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4686 DeclarationName Name = NameInfo.getName(); 4687 4688 FunctionDecl *NewFD = 0; 4689 bool isInline = D.getDeclSpec().isInlineSpecified(); 4690 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4691 FunctionDecl::StorageClass SCAsWritten 4692 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4693 4694 if (!SemaRef.getLangOpts().CPlusPlus) { 4695 // Determine whether the function was written with a 4696 // prototype. This true when: 4697 // - there is a prototype in the declarator, or 4698 // - the type R of the function is some kind of typedef or other reference 4699 // to a type name (which eventually refers to a function type). 4700 bool HasPrototype = 4701 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4702 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4703 4704 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4705 D.getLocStart(), NameInfo, R, 4706 TInfo, SC, SCAsWritten, isInline, 4707 HasPrototype); 4708 if (D.isInvalidType()) 4709 NewFD->setInvalidDecl(); 4710 4711 // Set the lexical context. 4712 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4713 4714 return NewFD; 4715 } 4716 4717 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4718 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4719 4720 // Check that the return type is not an abstract class type. 4721 // For record types, this is done by the AbstractClassUsageDiagnoser once 4722 // the class has been completely parsed. 4723 if (!DC->isRecord() && 4724 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4725 R->getAs<FunctionType>()->getResultType(), 4726 diag::err_abstract_type_in_decl, 4727 SemaRef.AbstractReturnType)) 4728 D.setInvalidType(); 4729 4730 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4731 // This is a C++ constructor declaration. 4732 assert(DC->isRecord() && 4733 "Constructors can only be declared in a member context"); 4734 4735 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4736 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4737 D.getLocStart(), NameInfo, 4738 R, TInfo, isExplicit, isInline, 4739 /*isImplicitlyDeclared=*/false, 4740 isConstexpr); 4741 4742 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4743 // This is a C++ destructor declaration. 4744 if (DC->isRecord()) { 4745 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4746 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4747 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4748 SemaRef.Context, Record, 4749 D.getLocStart(), 4750 NameInfo, R, TInfo, isInline, 4751 /*isImplicitlyDeclared=*/false); 4752 4753 // If the class is complete, then we now create the implicit exception 4754 // specification. If the class is incomplete or dependent, we can't do 4755 // it yet. 4756 if (SemaRef.getLangOpts().CPlusPlus0x && !Record->isDependentType() && 4757 Record->getDefinition() && !Record->isBeingDefined() && 4758 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4759 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4760 } 4761 4762 IsVirtualOkay = true; 4763 return NewDD; 4764 4765 } else { 4766 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4767 D.setInvalidType(); 4768 4769 // Create a FunctionDecl to satisfy the function definition parsing 4770 // code path. 4771 return FunctionDecl::Create(SemaRef.Context, DC, 4772 D.getLocStart(), 4773 D.getIdentifierLoc(), Name, R, TInfo, 4774 SC, SCAsWritten, isInline, 4775 /*hasPrototype=*/true, isConstexpr); 4776 } 4777 4778 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4779 if (!DC->isRecord()) { 4780 SemaRef.Diag(D.getIdentifierLoc(), 4781 diag::err_conv_function_not_member); 4782 return 0; 4783 } 4784 4785 SemaRef.CheckConversionDeclarator(D, R, SC); 4786 IsVirtualOkay = true; 4787 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4788 D.getLocStart(), NameInfo, 4789 R, TInfo, isInline, isExplicit, 4790 isConstexpr, SourceLocation()); 4791 4792 } else if (DC->isRecord()) { 4793 // If the name of the function is the same as the name of the record, 4794 // then this must be an invalid constructor that has a return type. 4795 // (The parser checks for a return type and makes the declarator a 4796 // constructor if it has no return type). 4797 if (Name.getAsIdentifierInfo() && 4798 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4799 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4800 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4801 << SourceRange(D.getIdentifierLoc()); 4802 return 0; 4803 } 4804 4805 bool isStatic = SC == SC_Static; 4806 4807 // [class.free]p1: 4808 // Any allocation function for a class T is a static member 4809 // (even if not explicitly declared static). 4810 if (Name.getCXXOverloadedOperator() == OO_New || 4811 Name.getCXXOverloadedOperator() == OO_Array_New) 4812 isStatic = true; 4813 4814 // [class.free]p6 Any deallocation function for a class X is a static member 4815 // (even if not explicitly declared static). 4816 if (Name.getCXXOverloadedOperator() == OO_Delete || 4817 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4818 isStatic = true; 4819 4820 IsVirtualOkay = !isStatic; 4821 4822 // This is a C++ method declaration. 4823 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4824 D.getLocStart(), NameInfo, R, 4825 TInfo, isStatic, SCAsWritten, isInline, 4826 isConstexpr, SourceLocation()); 4827 4828 } else { 4829 // Determine whether the function was written with a 4830 // prototype. This true when: 4831 // - we're in C++ (where every function has a prototype), 4832 return FunctionDecl::Create(SemaRef.Context, DC, 4833 D.getLocStart(), 4834 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4835 true/*HasPrototype*/, isConstexpr); 4836 } 4837} 4838 4839NamedDecl* 4840Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4841 TypeSourceInfo *TInfo, LookupResult &Previous, 4842 MultiTemplateParamsArg TemplateParamLists, 4843 bool &AddToScope) { 4844 QualType R = TInfo->getType(); 4845 4846 assert(R.getTypePtr()->isFunctionType()); 4847 4848 // TODO: consider using NameInfo for diagnostic. 4849 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4850 DeclarationName Name = NameInfo.getName(); 4851 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4852 4853 if (D.getDeclSpec().isThreadSpecified()) 4854 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4855 4856 // Do not allow returning a objc interface by-value. 4857 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4858 Diag(D.getIdentifierLoc(), 4859 diag::err_object_cannot_be_passed_returned_by_value) << 0 4860 << R->getAs<FunctionType>()->getResultType() 4861 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4862 4863 QualType T = R->getAs<FunctionType>()->getResultType(); 4864 T = Context.getObjCObjectPointerType(T); 4865 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4866 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4867 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4868 FPT->getNumArgs(), EPI); 4869 } 4870 else if (isa<FunctionNoProtoType>(R)) 4871 R = Context.getFunctionNoProtoType(T); 4872 } 4873 4874 bool isFriend = false; 4875 FunctionTemplateDecl *FunctionTemplate = 0; 4876 bool isExplicitSpecialization = false; 4877 bool isFunctionTemplateSpecialization = false; 4878 bool isDependentClassScopeExplicitSpecialization = false; 4879 bool isVirtualOkay = false; 4880 4881 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4882 isVirtualOkay); 4883 if (!NewFD) return 0; 4884 4885 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 4886 NewFD->setTopLevelDeclInObjCContainer(); 4887 4888 if (getLangOpts().CPlusPlus) { 4889 bool isInline = D.getDeclSpec().isInlineSpecified(); 4890 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4891 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4892 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4893 isFriend = D.getDeclSpec().isFriendSpecified(); 4894 if (isFriend && !isInline && D.isFunctionDefinition()) { 4895 // C++ [class.friend]p5 4896 // A function can be defined in a friend declaration of a 4897 // class . . . . Such a function is implicitly inline. 4898 NewFD->setImplicitlyInline(); 4899 } 4900 4901 SetNestedNameSpecifier(NewFD, D); 4902 isExplicitSpecialization = false; 4903 isFunctionTemplateSpecialization = false; 4904 if (D.isInvalidType()) 4905 NewFD->setInvalidDecl(); 4906 4907 // Set the lexical context. If the declarator has a C++ 4908 // scope specifier, or is the object of a friend declaration, the 4909 // lexical context will be different from the semantic context. 4910 NewFD->setLexicalDeclContext(CurContext); 4911 4912 // Match up the template parameter lists with the scope specifier, then 4913 // determine whether we have a template or a template specialization. 4914 bool Invalid = false; 4915 if (TemplateParameterList *TemplateParams 4916 = MatchTemplateParametersToScopeSpecifier( 4917 D.getDeclSpec().getLocStart(), 4918 D.getIdentifierLoc(), 4919 D.getCXXScopeSpec(), 4920 TemplateParamLists.get(), 4921 TemplateParamLists.size(), 4922 isFriend, 4923 isExplicitSpecialization, 4924 Invalid)) { 4925 if (TemplateParams->size() > 0) { 4926 // This is a function template 4927 4928 // Check that we can declare a template here. 4929 if (CheckTemplateDeclScope(S, TemplateParams)) 4930 return 0; 4931 4932 // A destructor cannot be a template. 4933 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4934 Diag(NewFD->getLocation(), diag::err_destructor_template); 4935 return 0; 4936 } 4937 4938 // If we're adding a template to a dependent context, we may need to 4939 // rebuilding some of the types used within the template parameter list, 4940 // now that we know what the current instantiation is. 4941 if (DC->isDependentContext()) { 4942 ContextRAII SavedContext(*this, DC); 4943 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4944 Invalid = true; 4945 } 4946 4947 4948 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4949 NewFD->getLocation(), 4950 Name, TemplateParams, 4951 NewFD); 4952 FunctionTemplate->setLexicalDeclContext(CurContext); 4953 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4954 4955 // For source fidelity, store the other template param lists. 4956 if (TemplateParamLists.size() > 1) { 4957 NewFD->setTemplateParameterListsInfo(Context, 4958 TemplateParamLists.size() - 1, 4959 TemplateParamLists.release()); 4960 } 4961 } else { 4962 // This is a function template specialization. 4963 isFunctionTemplateSpecialization = true; 4964 // For source fidelity, store all the template param lists. 4965 NewFD->setTemplateParameterListsInfo(Context, 4966 TemplateParamLists.size(), 4967 TemplateParamLists.release()); 4968 4969 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4970 if (isFriend) { 4971 // We want to remove the "template<>", found here. 4972 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4973 4974 // If we remove the template<> and the name is not a 4975 // template-id, we're actually silently creating a problem: 4976 // the friend declaration will refer to an untemplated decl, 4977 // and clearly the user wants a template specialization. So 4978 // we need to insert '<>' after the name. 4979 SourceLocation InsertLoc; 4980 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4981 InsertLoc = D.getName().getSourceRange().getEnd(); 4982 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4983 } 4984 4985 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4986 << Name << RemoveRange 4987 << FixItHint::CreateRemoval(RemoveRange) 4988 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4989 } 4990 } 4991 } 4992 else { 4993 // All template param lists were matched against the scope specifier: 4994 // this is NOT (an explicit specialization of) a template. 4995 if (TemplateParamLists.size() > 0) 4996 // For source fidelity, store all the template param lists. 4997 NewFD->setTemplateParameterListsInfo(Context, 4998 TemplateParamLists.size(), 4999 TemplateParamLists.release()); 5000 } 5001 5002 if (Invalid) { 5003 NewFD->setInvalidDecl(); 5004 if (FunctionTemplate) 5005 FunctionTemplate->setInvalidDecl(); 5006 } 5007 5008 // If we see "T var();" at block scope, where T is a class type, it is 5009 // probably an attempt to initialize a variable, not a function declaration. 5010 // We don't catch this case earlier, since there is no ambiguity here. 5011 if (!FunctionTemplate && D.getFunctionDefinitionKind() == FDK_Declaration && 5012 CurContext->isFunctionOrMethod() && 5013 D.getNumTypeObjects() == 1 && D.isFunctionDeclarator() && 5014 D.getDeclSpec().getStorageClassSpecAsWritten() 5015 == DeclSpec::SCS_unspecified) { 5016 QualType T = R->getAs<FunctionType>()->getResultType(); 5017 DeclaratorChunk &C = D.getTypeObject(0); 5018 if (!T->isVoidType() && C.Fun.NumArgs == 0 && !C.Fun.isVariadic && 5019 !C.Fun.TrailingReturnType && 5020 C.Fun.getExceptionSpecType() == EST_None) { 5021 SourceRange ParenRange(C.Loc, C.EndLoc); 5022 Diag(C.Loc, diag::warn_empty_parens_are_function_decl) << ParenRange; 5023 5024 // If the declaration looks like: 5025 // T var1, 5026 // f(); 5027 // and name lookup finds a function named 'f', then the ',' was 5028 // probably intended to be a ';'. 5029 if (!D.isFirstDeclarator() && D.getIdentifier()) { 5030 FullSourceLoc Comma(D.getCommaLoc(), SourceMgr); 5031 FullSourceLoc Name(D.getIdentifierLoc(), SourceMgr); 5032 if (Comma.getFileID() != Name.getFileID() || 5033 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 5034 LookupResult Result(*this, D.getIdentifier(), SourceLocation(), 5035 LookupOrdinaryName); 5036 if (LookupName(Result, S)) 5037 Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 5038 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") << NewFD; 5039 } 5040 } 5041 const CXXRecordDecl *RD = T->getAsCXXRecordDecl(); 5042 // Empty parens mean value-initialization, and no parens mean default 5043 // initialization. These are equivalent if the default constructor is 5044 // user-provided, or if zero-initialization is a no-op. 5045 if (RD && RD->hasDefinition() && 5046 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 5047 Diag(C.Loc, diag::note_empty_parens_default_ctor) 5048 << FixItHint::CreateRemoval(ParenRange); 5049 else if (const char *Init = getFixItZeroInitializerForType(T)) 5050 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5051 << FixItHint::CreateReplacement(ParenRange, Init); 5052 else if (LangOpts.CPlusPlus0x) 5053 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5054 << FixItHint::CreateReplacement(ParenRange, "{}"); 5055 } 5056 } 5057 5058 // C++ [dcl.fct.spec]p5: 5059 // The virtual specifier shall only be used in declarations of 5060 // nonstatic class member functions that appear within a 5061 // member-specification of a class declaration; see 10.3. 5062 // 5063 if (isVirtual && !NewFD->isInvalidDecl()) { 5064 if (!isVirtualOkay) { 5065 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5066 diag::err_virtual_non_function); 5067 } else if (!CurContext->isRecord()) { 5068 // 'virtual' was specified outside of the class. 5069 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5070 diag::err_virtual_out_of_class) 5071 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5072 } else if (NewFD->getDescribedFunctionTemplate()) { 5073 // C++ [temp.mem]p3: 5074 // A member function template shall not be virtual. 5075 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5076 diag::err_virtual_member_function_template) 5077 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5078 } else { 5079 // Okay: Add virtual to the method. 5080 NewFD->setVirtualAsWritten(true); 5081 } 5082 } 5083 5084 // C++ [dcl.fct.spec]p3: 5085 // The inline specifier shall not appear on a block scope function 5086 // declaration. 5087 if (isInline && !NewFD->isInvalidDecl()) { 5088 if (CurContext->isFunctionOrMethod()) { 5089 // 'inline' is not allowed on block scope function declaration. 5090 Diag(D.getDeclSpec().getInlineSpecLoc(), 5091 diag::err_inline_declaration_block_scope) << Name 5092 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 5093 } 5094 } 5095 5096 // C++ [dcl.fct.spec]p6: 5097 // The explicit specifier shall be used only in the declaration of a 5098 // constructor or conversion function within its class definition; 5099 // see 12.3.1 and 12.3.2. 5100 if (isExplicit && !NewFD->isInvalidDecl()) { 5101 if (!CurContext->isRecord()) { 5102 // 'explicit' was specified outside of the class. 5103 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5104 diag::err_explicit_out_of_class) 5105 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5106 } else if (!isa<CXXConstructorDecl>(NewFD) && 5107 !isa<CXXConversionDecl>(NewFD)) { 5108 // 'explicit' was specified on a function that wasn't a constructor 5109 // or conversion function. 5110 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5111 diag::err_explicit_non_ctor_or_conv_function) 5112 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5113 } 5114 } 5115 5116 if (isConstexpr) { 5117 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 5118 // are implicitly inline. 5119 NewFD->setImplicitlyInline(); 5120 5121 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 5122 // be either constructors or to return a literal type. Therefore, 5123 // destructors cannot be declared constexpr. 5124 if (isa<CXXDestructorDecl>(NewFD)) 5125 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 5126 } 5127 5128 // If __module_private__ was specified, mark the function accordingly. 5129 if (D.getDeclSpec().isModulePrivateSpecified()) { 5130 if (isFunctionTemplateSpecialization) { 5131 SourceLocation ModulePrivateLoc 5132 = D.getDeclSpec().getModulePrivateSpecLoc(); 5133 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5134 << 0 5135 << FixItHint::CreateRemoval(ModulePrivateLoc); 5136 } else { 5137 NewFD->setModulePrivate(); 5138 if (FunctionTemplate) 5139 FunctionTemplate->setModulePrivate(); 5140 } 5141 } 5142 5143 if (isFriend) { 5144 // For now, claim that the objects have no previous declaration. 5145 if (FunctionTemplate) { 5146 FunctionTemplate->setObjectOfFriendDecl(false); 5147 FunctionTemplate->setAccess(AS_public); 5148 } 5149 NewFD->setObjectOfFriendDecl(false); 5150 NewFD->setAccess(AS_public); 5151 } 5152 5153 // If a function is defined as defaulted or deleted, mark it as such now. 5154 switch (D.getFunctionDefinitionKind()) { 5155 case FDK_Declaration: 5156 case FDK_Definition: 5157 break; 5158 5159 case FDK_Defaulted: 5160 NewFD->setDefaulted(); 5161 break; 5162 5163 case FDK_Deleted: 5164 NewFD->setDeletedAsWritten(); 5165 break; 5166 } 5167 5168 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5169 D.isFunctionDefinition()) { 5170 // C++ [class.mfct]p2: 5171 // A member function may be defined (8.4) in its class definition, in 5172 // which case it is an inline member function (7.1.2) 5173 NewFD->setImplicitlyInline(); 5174 } 5175 5176 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5177 !CurContext->isRecord()) { 5178 // C++ [class.static]p1: 5179 // A data or function member of a class may be declared static 5180 // in a class definition, in which case it is a static member of 5181 // the class. 5182 5183 // Complain about the 'static' specifier if it's on an out-of-line 5184 // member function definition. 5185 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5186 diag::err_static_out_of_line) 5187 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5188 } 5189 } 5190 5191 // Filter out previous declarations that don't match the scope. 5192 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5193 isExplicitSpecialization || 5194 isFunctionTemplateSpecialization); 5195 5196 // Handle GNU asm-label extension (encoded as an attribute). 5197 if (Expr *E = (Expr*) D.getAsmLabel()) { 5198 // The parser guarantees this is a string. 5199 StringLiteral *SE = cast<StringLiteral>(E); 5200 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5201 SE->getString())); 5202 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 5203 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 5204 ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier()); 5205 if (I != ExtnameUndeclaredIdentifiers.end()) { 5206 NewFD->addAttr(I->second); 5207 ExtnameUndeclaredIdentifiers.erase(I); 5208 } 5209 } 5210 5211 // Copy the parameter declarations from the declarator D to the function 5212 // declaration NewFD, if they are available. First scavenge them into Params. 5213 SmallVector<ParmVarDecl*, 16> Params; 5214 if (D.isFunctionDeclarator()) { 5215 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5216 5217 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5218 // function that takes no arguments, not a function that takes a 5219 // single void argument. 5220 // We let through "const void" here because Sema::GetTypeForDeclarator 5221 // already checks for that case. 5222 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5223 FTI.ArgInfo[0].Param && 5224 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5225 // Empty arg list, don't push any params. 5226 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5227 5228 // In C++, the empty parameter-type-list must be spelled "void"; a 5229 // typedef of void is not permitted. 5230 if (getLangOpts().CPlusPlus && 5231 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5232 bool IsTypeAlias = false; 5233 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5234 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5235 else if (const TemplateSpecializationType *TST = 5236 Param->getType()->getAs<TemplateSpecializationType>()) 5237 IsTypeAlias = TST->isTypeAlias(); 5238 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5239 << IsTypeAlias; 5240 } 5241 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5242 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5243 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5244 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5245 Param->setDeclContext(NewFD); 5246 Params.push_back(Param); 5247 5248 if (Param->isInvalidDecl()) 5249 NewFD->setInvalidDecl(); 5250 } 5251 } 5252 5253 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5254 // When we're declaring a function with a typedef, typeof, etc as in the 5255 // following example, we'll need to synthesize (unnamed) 5256 // parameters for use in the declaration. 5257 // 5258 // @code 5259 // typedef void fn(int); 5260 // fn f; 5261 // @endcode 5262 5263 // Synthesize a parameter for each argument type. 5264 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5265 AE = FT->arg_type_end(); AI != AE; ++AI) { 5266 ParmVarDecl *Param = 5267 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5268 Param->setScopeInfo(0, Params.size()); 5269 Params.push_back(Param); 5270 } 5271 } else { 5272 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5273 "Should not need args for typedef of non-prototype fn"); 5274 } 5275 5276 // Finally, we know we have the right number of parameters, install them. 5277 NewFD->setParams(Params); 5278 5279 // Find all anonymous symbols defined during the declaration of this function 5280 // and add to NewFD. This lets us track decls such 'enum Y' in: 5281 // 5282 // void f(enum Y {AA} x) {} 5283 // 5284 // which would otherwise incorrectly end up in the translation unit scope. 5285 NewFD->setDeclsInPrototypeScope(DeclsInPrototypeScope); 5286 DeclsInPrototypeScope.clear(); 5287 5288 // Process the non-inheritable attributes on this declaration. 5289 ProcessDeclAttributes(S, NewFD, D, 5290 /*NonInheritable=*/true, /*Inheritable=*/false); 5291 5292 // Functions returning a variably modified type violate C99 6.7.5.2p2 5293 // because all functions have linkage. 5294 if (!NewFD->isInvalidDecl() && 5295 NewFD->getResultType()->isVariablyModifiedType()) { 5296 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5297 NewFD->setInvalidDecl(); 5298 } 5299 5300 if (!getLangOpts().CPlusPlus) { 5301 // Perform semantic checking on the function declaration. 5302 bool isExplicitSpecialization=false; 5303 if (!NewFD->isInvalidDecl()) { 5304 if (NewFD->isMain()) 5305 CheckMain(NewFD, D.getDeclSpec()); 5306 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5307 isExplicitSpecialization)); 5308 } 5309 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5310 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5311 "previous declaration set still overloaded"); 5312 } else { 5313 // If the declarator is a template-id, translate the parser's template 5314 // argument list into our AST format. 5315 bool HasExplicitTemplateArgs = false; 5316 TemplateArgumentListInfo TemplateArgs; 5317 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5318 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5319 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5320 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5321 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5322 TemplateId->getTemplateArgs(), 5323 TemplateId->NumArgs); 5324 translateTemplateArguments(TemplateArgsPtr, 5325 TemplateArgs); 5326 TemplateArgsPtr.release(); 5327 5328 HasExplicitTemplateArgs = true; 5329 5330 if (NewFD->isInvalidDecl()) { 5331 HasExplicitTemplateArgs = false; 5332 } else if (FunctionTemplate) { 5333 // Function template with explicit template arguments. 5334 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5335 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5336 5337 HasExplicitTemplateArgs = false; 5338 } else if (!isFunctionTemplateSpecialization && 5339 !D.getDeclSpec().isFriendSpecified()) { 5340 // We have encountered something that the user meant to be a 5341 // specialization (because it has explicitly-specified template 5342 // arguments) but that was not introduced with a "template<>" (or had 5343 // too few of them). 5344 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5345 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5346 << FixItHint::CreateInsertion( 5347 D.getDeclSpec().getLocStart(), 5348 "template<> "); 5349 isFunctionTemplateSpecialization = true; 5350 } else { 5351 // "friend void foo<>(int);" is an implicit specialization decl. 5352 isFunctionTemplateSpecialization = true; 5353 } 5354 } else if (isFriend && isFunctionTemplateSpecialization) { 5355 // This combination is only possible in a recovery case; the user 5356 // wrote something like: 5357 // template <> friend void foo(int); 5358 // which we're recovering from as if the user had written: 5359 // friend void foo<>(int); 5360 // Go ahead and fake up a template id. 5361 HasExplicitTemplateArgs = true; 5362 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5363 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5364 } 5365 5366 // If it's a friend (and only if it's a friend), it's possible 5367 // that either the specialized function type or the specialized 5368 // template is dependent, and therefore matching will fail. In 5369 // this case, don't check the specialization yet. 5370 bool InstantiationDependent = false; 5371 if (isFunctionTemplateSpecialization && isFriend && 5372 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5373 TemplateSpecializationType::anyDependentTemplateArguments( 5374 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5375 InstantiationDependent))) { 5376 assert(HasExplicitTemplateArgs && 5377 "friend function specialization without template args"); 5378 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5379 Previous)) 5380 NewFD->setInvalidDecl(); 5381 } else if (isFunctionTemplateSpecialization) { 5382 if (CurContext->isDependentContext() && CurContext->isRecord() 5383 && !isFriend) { 5384 isDependentClassScopeExplicitSpecialization = true; 5385 Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ? 5386 diag::ext_function_specialization_in_class : 5387 diag::err_function_specialization_in_class) 5388 << NewFD->getDeclName(); 5389 } else if (CheckFunctionTemplateSpecialization(NewFD, 5390 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5391 Previous)) 5392 NewFD->setInvalidDecl(); 5393 5394 // C++ [dcl.stc]p1: 5395 // A storage-class-specifier shall not be specified in an explicit 5396 // specialization (14.7.3) 5397 if (SC != SC_None) { 5398 if (SC != NewFD->getStorageClass()) 5399 Diag(NewFD->getLocation(), 5400 diag::err_explicit_specialization_inconsistent_storage_class) 5401 << SC 5402 << FixItHint::CreateRemoval( 5403 D.getDeclSpec().getStorageClassSpecLoc()); 5404 5405 else 5406 Diag(NewFD->getLocation(), 5407 diag::ext_explicit_specialization_storage_class) 5408 << FixItHint::CreateRemoval( 5409 D.getDeclSpec().getStorageClassSpecLoc()); 5410 } 5411 5412 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5413 if (CheckMemberSpecialization(NewFD, Previous)) 5414 NewFD->setInvalidDecl(); 5415 } 5416 5417 // Perform semantic checking on the function declaration. 5418 if (!isDependentClassScopeExplicitSpecialization) { 5419 if (NewFD->isInvalidDecl()) { 5420 // If this is a class member, mark the class invalid immediately. 5421 // This avoids some consistency errors later. 5422 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5423 methodDecl->getParent()->setInvalidDecl(); 5424 } else { 5425 if (NewFD->isMain()) 5426 CheckMain(NewFD, D.getDeclSpec()); 5427 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5428 isExplicitSpecialization)); 5429 } 5430 } 5431 5432 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5433 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5434 "previous declaration set still overloaded"); 5435 5436 NamedDecl *PrincipalDecl = (FunctionTemplate 5437 ? cast<NamedDecl>(FunctionTemplate) 5438 : NewFD); 5439 5440 if (isFriend && D.isRedeclaration()) { 5441 AccessSpecifier Access = AS_public; 5442 if (!NewFD->isInvalidDecl()) 5443 Access = NewFD->getPreviousDecl()->getAccess(); 5444 5445 NewFD->setAccess(Access); 5446 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5447 5448 PrincipalDecl->setObjectOfFriendDecl(true); 5449 } 5450 5451 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5452 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5453 PrincipalDecl->setNonMemberOperator(); 5454 5455 // If we have a function template, check the template parameter 5456 // list. This will check and merge default template arguments. 5457 if (FunctionTemplate) { 5458 FunctionTemplateDecl *PrevTemplate = 5459 FunctionTemplate->getPreviousDecl(); 5460 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5461 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5462 D.getDeclSpec().isFriendSpecified() 5463 ? (D.isFunctionDefinition() 5464 ? TPC_FriendFunctionTemplateDefinition 5465 : TPC_FriendFunctionTemplate) 5466 : (D.getCXXScopeSpec().isSet() && 5467 DC && DC->isRecord() && 5468 DC->isDependentContext()) 5469 ? TPC_ClassTemplateMember 5470 : TPC_FunctionTemplate); 5471 } 5472 5473 if (NewFD->isInvalidDecl()) { 5474 // Ignore all the rest of this. 5475 } else if (!D.isRedeclaration()) { 5476 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5477 AddToScope }; 5478 // Fake up an access specifier if it's supposed to be a class member. 5479 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5480 NewFD->setAccess(AS_public); 5481 5482 // Qualified decls generally require a previous declaration. 5483 if (D.getCXXScopeSpec().isSet()) { 5484 // ...with the major exception of templated-scope or 5485 // dependent-scope friend declarations. 5486 5487 // TODO: we currently also suppress this check in dependent 5488 // contexts because (1) the parameter depth will be off when 5489 // matching friend templates and (2) we might actually be 5490 // selecting a friend based on a dependent factor. But there 5491 // are situations where these conditions don't apply and we 5492 // can actually do this check immediately. 5493 if (isFriend && 5494 (TemplateParamLists.size() || 5495 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5496 CurContext->isDependentContext())) { 5497 // ignore these 5498 } else { 5499 // The user tried to provide an out-of-line definition for a 5500 // function that is a member of a class or namespace, but there 5501 // was no such member function declared (C++ [class.mfct]p2, 5502 // C++ [namespace.memdef]p2). For example: 5503 // 5504 // class X { 5505 // void f() const; 5506 // }; 5507 // 5508 // void X::f() { } // ill-formed 5509 // 5510 // Complain about this problem, and attempt to suggest close 5511 // matches (e.g., those that differ only in cv-qualifiers and 5512 // whether the parameter types are references). 5513 5514 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5515 NewFD, 5516 ExtraArgs)) { 5517 AddToScope = ExtraArgs.AddToScope; 5518 return Result; 5519 } 5520 } 5521 5522 // Unqualified local friend declarations are required to resolve 5523 // to something. 5524 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5525 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5526 NewFD, 5527 ExtraArgs)) { 5528 AddToScope = ExtraArgs.AddToScope; 5529 return Result; 5530 } 5531 } 5532 5533 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5534 !isFriend && !isFunctionTemplateSpecialization && 5535 !isExplicitSpecialization) { 5536 // An out-of-line member function declaration must also be a 5537 // definition (C++ [dcl.meaning]p1). 5538 // Note that this is not the case for explicit specializations of 5539 // function templates or member functions of class templates, per 5540 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5541 // extension for compatibility with old SWIG code which likes to 5542 // generate them. 5543 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5544 << D.getCXXScopeSpec().getRange(); 5545 } 5546 } 5547 5548 5549 // Handle attributes. We need to have merged decls when handling attributes 5550 // (for example to check for conflicts, etc). 5551 // FIXME: This needs to happen before we merge declarations. Then, 5552 // let attribute merging cope with attribute conflicts. 5553 ProcessDeclAttributes(S, NewFD, D, 5554 /*NonInheritable=*/false, /*Inheritable=*/true); 5555 5556 // attributes declared post-definition are currently ignored 5557 // FIXME: This should happen during attribute merging 5558 if (D.isRedeclaration() && Previous.isSingleResult()) { 5559 const FunctionDecl *Def; 5560 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5561 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5562 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5563 Diag(Def->getLocation(), diag::note_previous_definition); 5564 } 5565 } 5566 5567 AddKnownFunctionAttributes(NewFD); 5568 5569 if (NewFD->hasAttr<OverloadableAttr>() && 5570 !NewFD->getType()->getAs<FunctionProtoType>()) { 5571 Diag(NewFD->getLocation(), 5572 diag::err_attribute_overloadable_no_prototype) 5573 << NewFD; 5574 5575 // Turn this into a variadic function with no parameters. 5576 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5577 FunctionProtoType::ExtProtoInfo EPI; 5578 EPI.Variadic = true; 5579 EPI.ExtInfo = FT->getExtInfo(); 5580 5581 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5582 NewFD->setType(R); 5583 } 5584 5585 // If there's a #pragma GCC visibility in scope, and this isn't a class 5586 // member, set the visibility of this function. 5587 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5588 AddPushedVisibilityAttribute(NewFD); 5589 5590 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5591 // marking the function. 5592 AddCFAuditedAttribute(NewFD); 5593 5594 // If this is a locally-scoped extern C function, update the 5595 // map of such names. 5596 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5597 && !NewFD->isInvalidDecl()) 5598 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5599 5600 // Set this FunctionDecl's range up to the right paren. 5601 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5602 5603 if (getLangOpts().CPlusPlus) { 5604 if (FunctionTemplate) { 5605 if (NewFD->isInvalidDecl()) 5606 FunctionTemplate->setInvalidDecl(); 5607 return FunctionTemplate; 5608 } 5609 } 5610 5611 MarkUnusedFileScopedDecl(NewFD); 5612 5613 if (getLangOpts().CUDA) 5614 if (IdentifierInfo *II = NewFD->getIdentifier()) 5615 if (!NewFD->isInvalidDecl() && 5616 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5617 if (II->isStr("cudaConfigureCall")) { 5618 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5619 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5620 5621 Context.setcudaConfigureCallDecl(NewFD); 5622 } 5623 } 5624 5625 // Here we have an function template explicit specialization at class scope. 5626 // The actually specialization will be postponed to template instatiation 5627 // time via the ClassScopeFunctionSpecializationDecl node. 5628 if (isDependentClassScopeExplicitSpecialization) { 5629 ClassScopeFunctionSpecializationDecl *NewSpec = 5630 ClassScopeFunctionSpecializationDecl::Create( 5631 Context, CurContext, SourceLocation(), 5632 cast<CXXMethodDecl>(NewFD)); 5633 CurContext->addDecl(NewSpec); 5634 AddToScope = false; 5635 } 5636 5637 return NewFD; 5638} 5639 5640/// \brief Perform semantic checking of a new function declaration. 5641/// 5642/// Performs semantic analysis of the new function declaration 5643/// NewFD. This routine performs all semantic checking that does not 5644/// require the actual declarator involved in the declaration, and is 5645/// used both for the declaration of functions as they are parsed 5646/// (called via ActOnDeclarator) and for the declaration of functions 5647/// that have been instantiated via C++ template instantiation (called 5648/// via InstantiateDecl). 5649/// 5650/// \param IsExplicitSpecialiation whether this new function declaration is 5651/// an explicit specialization of the previous declaration. 5652/// 5653/// This sets NewFD->isInvalidDecl() to true if there was an error. 5654/// 5655/// Returns true if the function declaration is a redeclaration. 5656bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5657 LookupResult &Previous, 5658 bool IsExplicitSpecialization) { 5659 assert(!NewFD->getResultType()->isVariablyModifiedType() 5660 && "Variably modified return types are not handled here"); 5661 5662 // Check for a previous declaration of this name. 5663 if (Previous.empty() && NewFD->isExternC()) { 5664 // Since we did not find anything by this name and we're declaring 5665 // an extern "C" function, look for a non-visible extern "C" 5666 // declaration with the same name. 5667 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5668 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5669 if (Pos != LocallyScopedExternalDecls.end()) 5670 Previous.addDecl(Pos->second); 5671 } 5672 5673 bool Redeclaration = false; 5674 5675 // Merge or overload the declaration with an existing declaration of 5676 // the same name, if appropriate. 5677 if (!Previous.empty()) { 5678 // Determine whether NewFD is an overload of PrevDecl or 5679 // a declaration that requires merging. If it's an overload, 5680 // there's no more work to do here; we'll just add the new 5681 // function to the scope. 5682 5683 NamedDecl *OldDecl = 0; 5684 if (!AllowOverloadingOfFunction(Previous, Context)) { 5685 Redeclaration = true; 5686 OldDecl = Previous.getFoundDecl(); 5687 } else { 5688 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5689 /*NewIsUsingDecl*/ false)) { 5690 case Ovl_Match: 5691 Redeclaration = true; 5692 break; 5693 5694 case Ovl_NonFunction: 5695 Redeclaration = true; 5696 break; 5697 5698 case Ovl_Overload: 5699 Redeclaration = false; 5700 break; 5701 } 5702 5703 if (!getLangOpts().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5704 // If a function name is overloadable in C, then every function 5705 // with that name must be marked "overloadable". 5706 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5707 << Redeclaration << NewFD; 5708 NamedDecl *OverloadedDecl = 0; 5709 if (Redeclaration) 5710 OverloadedDecl = OldDecl; 5711 else if (!Previous.empty()) 5712 OverloadedDecl = Previous.getRepresentativeDecl(); 5713 if (OverloadedDecl) 5714 Diag(OverloadedDecl->getLocation(), 5715 diag::note_attribute_overloadable_prev_overload); 5716 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5717 Context)); 5718 } 5719 } 5720 5721 if (Redeclaration) { 5722 // NewFD and OldDecl represent declarations that need to be 5723 // merged. 5724 if (MergeFunctionDecl(NewFD, OldDecl, S)) { 5725 NewFD->setInvalidDecl(); 5726 return Redeclaration; 5727 } 5728 5729 Previous.clear(); 5730 Previous.addDecl(OldDecl); 5731 5732 if (FunctionTemplateDecl *OldTemplateDecl 5733 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5734 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5735 FunctionTemplateDecl *NewTemplateDecl 5736 = NewFD->getDescribedFunctionTemplate(); 5737 assert(NewTemplateDecl && "Template/non-template mismatch"); 5738 if (CXXMethodDecl *Method 5739 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5740 Method->setAccess(OldTemplateDecl->getAccess()); 5741 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5742 } 5743 5744 // If this is an explicit specialization of a member that is a function 5745 // template, mark it as a member specialization. 5746 if (IsExplicitSpecialization && 5747 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5748 NewTemplateDecl->setMemberSpecialization(); 5749 assert(OldTemplateDecl->isMemberSpecialization()); 5750 } 5751 5752 } else { 5753 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5754 NewFD->setAccess(OldDecl->getAccess()); 5755 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5756 } 5757 } 5758 } 5759 5760 // Semantic checking for this function declaration (in isolation). 5761 if (getLangOpts().CPlusPlus) { 5762 // C++-specific checks. 5763 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5764 CheckConstructor(Constructor); 5765 } else if (CXXDestructorDecl *Destructor = 5766 dyn_cast<CXXDestructorDecl>(NewFD)) { 5767 CXXRecordDecl *Record = Destructor->getParent(); 5768 QualType ClassType = Context.getTypeDeclType(Record); 5769 5770 // FIXME: Shouldn't we be able to perform this check even when the class 5771 // type is dependent? Both gcc and edg can handle that. 5772 if (!ClassType->isDependentType()) { 5773 DeclarationName Name 5774 = Context.DeclarationNames.getCXXDestructorName( 5775 Context.getCanonicalType(ClassType)); 5776 if (NewFD->getDeclName() != Name) { 5777 Diag(NewFD->getLocation(), diag::err_destructor_name); 5778 NewFD->setInvalidDecl(); 5779 return Redeclaration; 5780 } 5781 } 5782 } else if (CXXConversionDecl *Conversion 5783 = dyn_cast<CXXConversionDecl>(NewFD)) { 5784 ActOnConversionDeclarator(Conversion); 5785 } 5786 5787 // Find any virtual functions that this function overrides. 5788 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5789 if (!Method->isFunctionTemplateSpecialization() && 5790 !Method->getDescribedFunctionTemplate()) { 5791 if (AddOverriddenMethods(Method->getParent(), Method)) { 5792 // If the function was marked as "static", we have a problem. 5793 if (NewFD->getStorageClass() == SC_Static) { 5794 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5795 << NewFD->getDeclName(); 5796 for (CXXMethodDecl::method_iterator 5797 Overridden = Method->begin_overridden_methods(), 5798 OverriddenEnd = Method->end_overridden_methods(); 5799 Overridden != OverriddenEnd; 5800 ++Overridden) { 5801 Diag((*Overridden)->getLocation(), 5802 diag::note_overridden_virtual_function); 5803 } 5804 } 5805 } 5806 } 5807 } 5808 5809 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5810 if (NewFD->isOverloadedOperator() && 5811 CheckOverloadedOperatorDeclaration(NewFD)) { 5812 NewFD->setInvalidDecl(); 5813 return Redeclaration; 5814 } 5815 5816 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5817 if (NewFD->getLiteralIdentifier() && 5818 CheckLiteralOperatorDeclaration(NewFD)) { 5819 NewFD->setInvalidDecl(); 5820 return Redeclaration; 5821 } 5822 5823 // In C++, check default arguments now that we have merged decls. Unless 5824 // the lexical context is the class, because in this case this is done 5825 // during delayed parsing anyway. 5826 if (!CurContext->isRecord()) 5827 CheckCXXDefaultArguments(NewFD); 5828 5829 // If this function declares a builtin function, check the type of this 5830 // declaration against the expected type for the builtin. 5831 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5832 ASTContext::GetBuiltinTypeError Error; 5833 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5834 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5835 // The type of this function differs from the type of the builtin, 5836 // so forget about the builtin entirely. 5837 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5838 } 5839 } 5840 5841 // If this function is declared as being extern "C", then check to see if 5842 // the function returns a UDT (class, struct, or union type) that is not C 5843 // compatible, and if it does, warn the user. 5844 if (NewFD->isExternC()) { 5845 QualType R = NewFD->getResultType(); 5846 if (!R.isPODType(Context) && 5847 !R->isVoidType()) 5848 Diag( NewFD->getLocation(), diag::warn_return_value_udt ) 5849 << NewFD << R; 5850 } 5851 } 5852 return Redeclaration; 5853} 5854 5855void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5856 // C++11 [basic.start.main]p3: A program that declares main to be inline, 5857 // static or constexpr is ill-formed. 5858 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5859 // shall not appear in a declaration of main. 5860 // static main is not an error under C99, but we should warn about it. 5861 if (FD->getStorageClass() == SC_Static) 5862 Diag(DS.getStorageClassSpecLoc(), getLangOpts().CPlusPlus 5863 ? diag::err_static_main : diag::warn_static_main) 5864 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5865 if (FD->isInlineSpecified()) 5866 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5867 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5868 if (FD->isConstexpr()) { 5869 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main) 5870 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc()); 5871 FD->setConstexpr(false); 5872 } 5873 5874 QualType T = FD->getType(); 5875 assert(T->isFunctionType() && "function decl is not of function type"); 5876 const FunctionType* FT = T->castAs<FunctionType>(); 5877 5878 // All the standards say that main() should should return 'int'. 5879 if (Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5880 // In C and C++, main magically returns 0 if you fall off the end; 5881 // set the flag which tells us that. 5882 // This is C++ [basic.start.main]p5 and C99 5.1.2.2.3. 5883 FD->setHasImplicitReturnZero(true); 5884 5885 // In C with GNU extensions we allow main() to have non-integer return 5886 // type, but we should warn about the extension, and we disable the 5887 // implicit-return-zero rule. 5888 } else if (getLangOpts().GNUMode && !getLangOpts().CPlusPlus) { 5889 Diag(FD->getTypeSpecStartLoc(), diag::ext_main_returns_nonint); 5890 5891 // Otherwise, this is just a flat-out error. 5892 } else { 5893 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5894 FD->setInvalidDecl(true); 5895 } 5896 5897 // Treat protoless main() as nullary. 5898 if (isa<FunctionNoProtoType>(FT)) return; 5899 5900 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5901 unsigned nparams = FTP->getNumArgs(); 5902 assert(FD->getNumParams() == nparams); 5903 5904 bool HasExtraParameters = (nparams > 3); 5905 5906 // Darwin passes an undocumented fourth argument of type char**. If 5907 // other platforms start sprouting these, the logic below will start 5908 // getting shifty. 5909 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5910 HasExtraParameters = false; 5911 5912 if (HasExtraParameters) { 5913 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5914 FD->setInvalidDecl(true); 5915 nparams = 3; 5916 } 5917 5918 // FIXME: a lot of the following diagnostics would be improved 5919 // if we had some location information about types. 5920 5921 QualType CharPP = 5922 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5923 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5924 5925 for (unsigned i = 0; i < nparams; ++i) { 5926 QualType AT = FTP->getArgType(i); 5927 5928 bool mismatch = true; 5929 5930 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5931 mismatch = false; 5932 else if (Expected[i] == CharPP) { 5933 // As an extension, the following forms are okay: 5934 // char const ** 5935 // char const * const * 5936 // char * const * 5937 5938 QualifierCollector qs; 5939 const PointerType* PT; 5940 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5941 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5942 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5943 qs.removeConst(); 5944 mismatch = !qs.empty(); 5945 } 5946 } 5947 5948 if (mismatch) { 5949 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5950 // TODO: suggest replacing given type with expected type 5951 FD->setInvalidDecl(true); 5952 } 5953 } 5954 5955 if (nparams == 1 && !FD->isInvalidDecl()) { 5956 Diag(FD->getLocation(), diag::warn_main_one_arg); 5957 } 5958 5959 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5960 Diag(FD->getLocation(), diag::err_main_template_decl); 5961 FD->setInvalidDecl(); 5962 } 5963} 5964 5965bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5966 // FIXME: Need strict checking. In C89, we need to check for 5967 // any assignment, increment, decrement, function-calls, or 5968 // commas outside of a sizeof. In C99, it's the same list, 5969 // except that the aforementioned are allowed in unevaluated 5970 // expressions. Everything else falls under the 5971 // "may accept other forms of constant expressions" exception. 5972 // (We never end up here for C++, so the constant expression 5973 // rules there don't matter.) 5974 if (Init->isConstantInitializer(Context, false)) 5975 return false; 5976 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5977 << Init->getSourceRange(); 5978 return true; 5979} 5980 5981namespace { 5982 // Visits an initialization expression to see if OrigDecl is evaluated in 5983 // its own initialization and throws a warning if it does. 5984 class SelfReferenceChecker 5985 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5986 Sema &S; 5987 Decl *OrigDecl; 5988 bool isRecordType; 5989 bool isPODType; 5990 5991 public: 5992 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5993 5994 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5995 S(S), OrigDecl(OrigDecl) { 5996 isPODType = false; 5997 isRecordType = false; 5998 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5999 isPODType = VD->getType().isPODType(S.Context); 6000 isRecordType = VD->getType()->isRecordType(); 6001 } 6002 } 6003 6004 void VisitExpr(Expr *E) { 6005 if (isa<ObjCMessageExpr>(*E)) return; 6006 if (isRecordType) { 6007 Expr *expr = E; 6008 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 6009 ValueDecl *VD = ME->getMemberDecl(); 6010 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 6011 expr = ME->getBase(); 6012 } 6013 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 6014 HandleDeclRefExpr(DRE); 6015 return; 6016 } 6017 } 6018 Inherited::VisitExpr(E); 6019 } 6020 6021 void VisitMemberExpr(MemberExpr *E) { 6022 if (E->getType()->canDecayToPointerType()) return; 6023 ValueDecl *VD = E->getMemberDecl(); 6024 if (isa<FieldDecl>(VD) || isa<CXXMethodDecl>(VD)) 6025 if (DeclRefExpr *DRE 6026 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 6027 HandleDeclRefExpr(DRE); 6028 return; 6029 } 6030 Inherited::VisitMemberExpr(E); 6031 } 6032 6033 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 6034 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 6035 (isRecordType && E->getCastKind() == CK_NoOp)) { 6036 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 6037 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 6038 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 6039 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 6040 HandleDeclRefExpr(DRE); 6041 return; 6042 } 6043 } 6044 Inherited::VisitImplicitCastExpr(E); 6045 } 6046 6047 void VisitUnaryOperator(UnaryOperator *E) { 6048 // For POD record types, addresses of its own members are well-defined. 6049 if (isRecordType && isPODType) return; 6050 Inherited::VisitUnaryOperator(E); 6051 } 6052 6053 void HandleDeclRefExpr(DeclRefExpr *DRE) { 6054 Decl* ReferenceDecl = DRE->getDecl(); 6055 if (OrigDecl != ReferenceDecl) return; 6056 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 6057 Sema::NotForRedeclaration); 6058 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 6059 S.PDiag(diag::warn_uninit_self_reference_in_init) 6060 << Result.getLookupName() 6061 << OrigDecl->getLocation() 6062 << DRE->getSourceRange()); 6063 } 6064 }; 6065} 6066 6067/// CheckSelfReference - Warns if OrigDecl is used in expression E. 6068void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 6069 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 6070} 6071 6072/// AddInitializerToDecl - Adds the initializer Init to the 6073/// declaration dcl. If DirectInit is true, this is C++ direct 6074/// initialization rather than copy initialization. 6075void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 6076 bool DirectInit, bool TypeMayContainAuto) { 6077 // If there is no declaration, there was an error parsing it. Just ignore 6078 // the initializer. 6079 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 6080 return; 6081 6082 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 6083 // With declarators parsed the way they are, the parser cannot 6084 // distinguish between a normal initializer and a pure-specifier. 6085 // Thus this grotesque test. 6086 IntegerLiteral *IL; 6087 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 6088 Context.getCanonicalType(IL->getType()) == Context.IntTy) 6089 CheckPureMethod(Method, Init->getSourceRange()); 6090 else { 6091 Diag(Method->getLocation(), diag::err_member_function_initialization) 6092 << Method->getDeclName() << Init->getSourceRange(); 6093 Method->setInvalidDecl(); 6094 } 6095 return; 6096 } 6097 6098 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6099 if (!VDecl) { 6100 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 6101 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6102 RealDecl->setInvalidDecl(); 6103 return; 6104 } 6105 6106 // Check for self-references within variable initializers. 6107 // Variables declared within a function/method body are handled 6108 // by a dataflow analysis. 6109 if (!VDecl->hasLocalStorage() && !VDecl->isStaticLocal()) 6110 CheckSelfReference(RealDecl, Init); 6111 6112 ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init); 6113 6114 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6115 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6116 Expr *DeduceInit = Init; 6117 // Initializer could be a C++ direct-initializer. Deduction only works if it 6118 // contains exactly one expression. 6119 if (CXXDirectInit) { 6120 if (CXXDirectInit->getNumExprs() == 0) { 6121 // It isn't possible to write this directly, but it is possible to 6122 // end up in this situation with "auto x(some_pack...);" 6123 Diag(CXXDirectInit->getLocStart(), 6124 diag::err_auto_var_init_no_expression) 6125 << VDecl->getDeclName() << VDecl->getType() 6126 << VDecl->getSourceRange(); 6127 RealDecl->setInvalidDecl(); 6128 return; 6129 } else if (CXXDirectInit->getNumExprs() > 1) { 6130 Diag(CXXDirectInit->getExpr(1)->getLocStart(), 6131 diag::err_auto_var_init_multiple_expressions) 6132 << VDecl->getDeclName() << VDecl->getType() 6133 << VDecl->getSourceRange(); 6134 RealDecl->setInvalidDecl(); 6135 return; 6136 } else { 6137 DeduceInit = CXXDirectInit->getExpr(0); 6138 } 6139 } 6140 TypeSourceInfo *DeducedType = 0; 6141 if (DeduceAutoType(VDecl->getTypeSourceInfo(), DeduceInit, DeducedType) == 6142 DAR_Failed) 6143 DiagnoseAutoDeductionFailure(VDecl, DeduceInit); 6144 if (!DeducedType) { 6145 RealDecl->setInvalidDecl(); 6146 return; 6147 } 6148 VDecl->setTypeSourceInfo(DeducedType); 6149 VDecl->setType(DeducedType->getType()); 6150 VDecl->ClearLinkageCache(); 6151 6152 // In ARC, infer lifetime. 6153 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 6154 VDecl->setInvalidDecl(); 6155 6156 // If this is a redeclaration, check that the type we just deduced matches 6157 // the previously declared type. 6158 if (VarDecl *Old = VDecl->getPreviousDecl()) 6159 MergeVarDeclTypes(VDecl, Old); 6160 } 6161 6162 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 6163 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 6164 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6165 VDecl->setInvalidDecl(); 6166 return; 6167 } 6168 6169 if (!VDecl->getType()->isDependentType()) { 6170 // A definition must end up with a complete type, which means it must be 6171 // complete with the restriction that an array type might be completed by 6172 // the initializer; note that later code assumes this restriction. 6173 QualType BaseDeclType = VDecl->getType(); 6174 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 6175 BaseDeclType = Array->getElementType(); 6176 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 6177 diag::err_typecheck_decl_incomplete_type)) { 6178 RealDecl->setInvalidDecl(); 6179 return; 6180 } 6181 6182 // The variable can not have an abstract class type. 6183 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6184 diag::err_abstract_type_in_decl, 6185 AbstractVariableType)) 6186 VDecl->setInvalidDecl(); 6187 } 6188 6189 const VarDecl *Def; 6190 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6191 Diag(VDecl->getLocation(), diag::err_redefinition) 6192 << VDecl->getDeclName(); 6193 Diag(Def->getLocation(), diag::note_previous_definition); 6194 VDecl->setInvalidDecl(); 6195 return; 6196 } 6197 6198 const VarDecl* PrevInit = 0; 6199 if (getLangOpts().CPlusPlus) { 6200 // C++ [class.static.data]p4 6201 // If a static data member is of const integral or const 6202 // enumeration type, its declaration in the class definition can 6203 // specify a constant-initializer which shall be an integral 6204 // constant expression (5.19). In that case, the member can appear 6205 // in integral constant expressions. The member shall still be 6206 // defined in a namespace scope if it is used in the program and the 6207 // namespace scope definition shall not contain an initializer. 6208 // 6209 // We already performed a redefinition check above, but for static 6210 // data members we also need to check whether there was an in-class 6211 // declaration with an initializer. 6212 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6213 Diag(VDecl->getLocation(), diag::err_redefinition) 6214 << VDecl->getDeclName(); 6215 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6216 return; 6217 } 6218 6219 if (VDecl->hasLocalStorage()) 6220 getCurFunction()->setHasBranchProtectedScope(); 6221 6222 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6223 VDecl->setInvalidDecl(); 6224 return; 6225 } 6226 } 6227 6228 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6229 // a kernel function cannot be initialized." 6230 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6231 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6232 VDecl->setInvalidDecl(); 6233 return; 6234 } 6235 6236 // Get the decls type and save a reference for later, since 6237 // CheckInitializerTypes may change it. 6238 QualType DclT = VDecl->getType(), SavT = DclT; 6239 6240 // Top-level message sends default to 'id' when we're in a debugger 6241 // and we are assigning it to a variable of 'id' type. 6242 if (getLangOpts().DebuggerCastResultToId && DclT->isObjCIdType()) 6243 if (Init->getType() == Context.UnknownAnyTy && isa<ObjCMessageExpr>(Init)) { 6244 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType()); 6245 if (Result.isInvalid()) { 6246 VDecl->setInvalidDecl(); 6247 return; 6248 } 6249 Init = Result.take(); 6250 } 6251 6252 // Perform the initialization. 6253 if (!VDecl->isInvalidDecl()) { 6254 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6255 InitializationKind Kind 6256 = DirectInit ? 6257 CXXDirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6258 Init->getLocStart(), 6259 Init->getLocEnd()) 6260 : InitializationKind::CreateDirectList( 6261 VDecl->getLocation()) 6262 : InitializationKind::CreateCopy(VDecl->getLocation(), 6263 Init->getLocStart()); 6264 6265 Expr **Args = &Init; 6266 unsigned NumArgs = 1; 6267 if (CXXDirectInit) { 6268 Args = CXXDirectInit->getExprs(); 6269 NumArgs = CXXDirectInit->getNumExprs(); 6270 } 6271 InitializationSequence InitSeq(*this, Entity, Kind, Args, NumArgs); 6272 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6273 MultiExprArg(*this, Args,NumArgs), 6274 &DclT); 6275 if (Result.isInvalid()) { 6276 VDecl->setInvalidDecl(); 6277 return; 6278 } 6279 6280 Init = Result.takeAs<Expr>(); 6281 } 6282 6283 // If the type changed, it means we had an incomplete type that was 6284 // completed by the initializer. For example: 6285 // int ary[] = { 1, 3, 5 }; 6286 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6287 if (!VDecl->isInvalidDecl() && (DclT != SavT)) 6288 VDecl->setType(DclT); 6289 6290 // Check any implicit conversions within the expression. 6291 CheckImplicitConversions(Init, VDecl->getLocation()); 6292 6293 if (!VDecl->isInvalidDecl()) 6294 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6295 6296 Init = MaybeCreateExprWithCleanups(Init); 6297 // Attach the initializer to the decl. 6298 VDecl->setInit(Init); 6299 6300 if (VDecl->isLocalVarDecl()) { 6301 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6302 // static storage duration shall be constant expressions or string literals. 6303 // C++ does not have this restriction. 6304 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl() && 6305 VDecl->getStorageClass() == SC_Static) 6306 CheckForConstantInitializer(Init, DclT); 6307 } else if (VDecl->isStaticDataMember() && 6308 VDecl->getLexicalDeclContext()->isRecord()) { 6309 // This is an in-class initialization for a static data member, e.g., 6310 // 6311 // struct S { 6312 // static const int value = 17; 6313 // }; 6314 6315 // C++ [class.mem]p4: 6316 // A member-declarator can contain a constant-initializer only 6317 // if it declares a static member (9.4) of const integral or 6318 // const enumeration type, see 9.4.2. 6319 // 6320 // C++11 [class.static.data]p3: 6321 // If a non-volatile const static data member is of integral or 6322 // enumeration type, its declaration in the class definition can 6323 // specify a brace-or-equal-initializer in which every initalizer-clause 6324 // that is an assignment-expression is a constant expression. A static 6325 // data member of literal type can be declared in the class definition 6326 // with the constexpr specifier; if so, its declaration shall specify a 6327 // brace-or-equal-initializer in which every initializer-clause that is 6328 // an assignment-expression is a constant expression. 6329 6330 // Do nothing on dependent types. 6331 if (DclT->isDependentType()) { 6332 6333 // Allow any 'static constexpr' members, whether or not they are of literal 6334 // type. We separately check that every constexpr variable is of literal 6335 // type. 6336 } else if (VDecl->isConstexpr()) { 6337 6338 // Require constness. 6339 } else if (!DclT.isConstQualified()) { 6340 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6341 << Init->getSourceRange(); 6342 VDecl->setInvalidDecl(); 6343 6344 // We allow integer constant expressions in all cases. 6345 } else if (DclT->isIntegralOrEnumerationType()) { 6346 // Check whether the expression is a constant expression. 6347 SourceLocation Loc; 6348 if (getLangOpts().CPlusPlus0x && DclT.isVolatileQualified()) 6349 // In C++11, a non-constexpr const static data member with an 6350 // in-class initializer cannot be volatile. 6351 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6352 else if (Init->isValueDependent()) 6353 ; // Nothing to check. 6354 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6355 ; // Ok, it's an ICE! 6356 else if (Init->isEvaluatable(Context)) { 6357 // If we can constant fold the initializer through heroics, accept it, 6358 // but report this as a use of an extension for -pedantic. 6359 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6360 << Init->getSourceRange(); 6361 } else { 6362 // Otherwise, this is some crazy unknown case. Report the issue at the 6363 // location provided by the isIntegerConstantExpr failed check. 6364 Diag(Loc, diag::err_in_class_initializer_non_constant) 6365 << Init->getSourceRange(); 6366 VDecl->setInvalidDecl(); 6367 } 6368 6369 // We allow foldable floating-point constants as an extension. 6370 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6371 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6372 << DclT << Init->getSourceRange(); 6373 if (getLangOpts().CPlusPlus0x) 6374 Diag(VDecl->getLocation(), 6375 diag::note_in_class_initializer_float_type_constexpr) 6376 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6377 6378 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6379 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6380 << Init->getSourceRange(); 6381 VDecl->setInvalidDecl(); 6382 } 6383 6384 // Suggest adding 'constexpr' in C++11 for literal types. 6385 } else if (getLangOpts().CPlusPlus0x && DclT->isLiteralType()) { 6386 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6387 << DclT << Init->getSourceRange() 6388 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6389 VDecl->setConstexpr(true); 6390 6391 } else { 6392 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6393 << DclT << Init->getSourceRange(); 6394 VDecl->setInvalidDecl(); 6395 } 6396 } else if (VDecl->isFileVarDecl()) { 6397 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6398 (!getLangOpts().CPlusPlus || 6399 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6400 Diag(VDecl->getLocation(), diag::warn_extern_init); 6401 6402 // C99 6.7.8p4. All file scoped initializers need to be constant. 6403 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl()) 6404 CheckForConstantInitializer(Init, DclT); 6405 } 6406 6407 // We will represent direct-initialization similarly to copy-initialization: 6408 // int x(1); -as-> int x = 1; 6409 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6410 // 6411 // Clients that want to distinguish between the two forms, can check for 6412 // direct initializer using VarDecl::getInitStyle(). 6413 // A major benefit is that clients that don't particularly care about which 6414 // exactly form was it (like the CodeGen) can handle both cases without 6415 // special case code. 6416 6417 // C++ 8.5p11: 6418 // The form of initialization (using parentheses or '=') is generally 6419 // insignificant, but does matter when the entity being initialized has a 6420 // class type. 6421 if (CXXDirectInit) { 6422 assert(DirectInit && "Call-style initializer must be direct init."); 6423 VDecl->setInitStyle(VarDecl::CallInit); 6424 } else if (DirectInit) { 6425 // This must be list-initialization. No other way is direct-initialization. 6426 VDecl->setInitStyle(VarDecl::ListInit); 6427 } 6428 6429 CheckCompleteVariableDeclaration(VDecl); 6430} 6431 6432/// ActOnInitializerError - Given that there was an error parsing an 6433/// initializer for the given declaration, try to return to some form 6434/// of sanity. 6435void Sema::ActOnInitializerError(Decl *D) { 6436 // Our main concern here is re-establishing invariants like "a 6437 // variable's type is either dependent or complete". 6438 if (!D || D->isInvalidDecl()) return; 6439 6440 VarDecl *VD = dyn_cast<VarDecl>(D); 6441 if (!VD) return; 6442 6443 // Auto types are meaningless if we can't make sense of the initializer. 6444 if (ParsingInitForAutoVars.count(D)) { 6445 D->setInvalidDecl(); 6446 return; 6447 } 6448 6449 QualType Ty = VD->getType(); 6450 if (Ty->isDependentType()) return; 6451 6452 // Require a complete type. 6453 if (RequireCompleteType(VD->getLocation(), 6454 Context.getBaseElementType(Ty), 6455 diag::err_typecheck_decl_incomplete_type)) { 6456 VD->setInvalidDecl(); 6457 return; 6458 } 6459 6460 // Require an abstract type. 6461 if (RequireNonAbstractType(VD->getLocation(), Ty, 6462 diag::err_abstract_type_in_decl, 6463 AbstractVariableType)) { 6464 VD->setInvalidDecl(); 6465 return; 6466 } 6467 6468 // Don't bother complaining about constructors or destructors, 6469 // though. 6470} 6471 6472void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6473 bool TypeMayContainAuto) { 6474 // If there is no declaration, there was an error parsing it. Just ignore it. 6475 if (RealDecl == 0) 6476 return; 6477 6478 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6479 QualType Type = Var->getType(); 6480 6481 // C++11 [dcl.spec.auto]p3 6482 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6483 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6484 << Var->getDeclName() << Type; 6485 Var->setInvalidDecl(); 6486 return; 6487 } 6488 6489 // C++11 [class.static.data]p3: A static data member can be declared with 6490 // the constexpr specifier; if so, its declaration shall specify 6491 // a brace-or-equal-initializer. 6492 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6493 // the definition of a variable [...] or the declaration of a static data 6494 // member. 6495 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6496 if (Var->isStaticDataMember()) 6497 Diag(Var->getLocation(), 6498 diag::err_constexpr_static_mem_var_requires_init) 6499 << Var->getDeclName(); 6500 else 6501 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6502 Var->setInvalidDecl(); 6503 return; 6504 } 6505 6506 switch (Var->isThisDeclarationADefinition()) { 6507 case VarDecl::Definition: 6508 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6509 break; 6510 6511 // We have an out-of-line definition of a static data member 6512 // that has an in-class initializer, so we type-check this like 6513 // a declaration. 6514 // 6515 // Fall through 6516 6517 case VarDecl::DeclarationOnly: 6518 // It's only a declaration. 6519 6520 // Block scope. C99 6.7p7: If an identifier for an object is 6521 // declared with no linkage (C99 6.2.2p6), the type for the 6522 // object shall be complete. 6523 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6524 !Var->getLinkage() && !Var->isInvalidDecl() && 6525 RequireCompleteType(Var->getLocation(), Type, 6526 diag::err_typecheck_decl_incomplete_type)) 6527 Var->setInvalidDecl(); 6528 6529 // Make sure that the type is not abstract. 6530 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6531 RequireNonAbstractType(Var->getLocation(), Type, 6532 diag::err_abstract_type_in_decl, 6533 AbstractVariableType)) 6534 Var->setInvalidDecl(); 6535 return; 6536 6537 case VarDecl::TentativeDefinition: 6538 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6539 // object that has file scope without an initializer, and without a 6540 // storage-class specifier or with the storage-class specifier "static", 6541 // constitutes a tentative definition. Note: A tentative definition with 6542 // external linkage is valid (C99 6.2.2p5). 6543 if (!Var->isInvalidDecl()) { 6544 if (const IncompleteArrayType *ArrayT 6545 = Context.getAsIncompleteArrayType(Type)) { 6546 if (RequireCompleteType(Var->getLocation(), 6547 ArrayT->getElementType(), 6548 diag::err_illegal_decl_array_incomplete_type)) 6549 Var->setInvalidDecl(); 6550 } else if (Var->getStorageClass() == SC_Static) { 6551 // C99 6.9.2p3: If the declaration of an identifier for an object is 6552 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6553 // declared type shall not be an incomplete type. 6554 // NOTE: code such as the following 6555 // static struct s; 6556 // struct s { int a; }; 6557 // is accepted by gcc. Hence here we issue a warning instead of 6558 // an error and we do not invalidate the static declaration. 6559 // NOTE: to avoid multiple warnings, only check the first declaration. 6560 if (Var->getPreviousDecl() == 0) 6561 RequireCompleteType(Var->getLocation(), Type, 6562 diag::ext_typecheck_decl_incomplete_type); 6563 } 6564 } 6565 6566 // Record the tentative definition; we're done. 6567 if (!Var->isInvalidDecl()) 6568 TentativeDefinitions.push_back(Var); 6569 return; 6570 } 6571 6572 // Provide a specific diagnostic for uninitialized variable 6573 // definitions with incomplete array type. 6574 if (Type->isIncompleteArrayType()) { 6575 Diag(Var->getLocation(), 6576 diag::err_typecheck_incomplete_array_needs_initializer); 6577 Var->setInvalidDecl(); 6578 return; 6579 } 6580 6581 // Provide a specific diagnostic for uninitialized variable 6582 // definitions with reference type. 6583 if (Type->isReferenceType()) { 6584 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6585 << Var->getDeclName() 6586 << SourceRange(Var->getLocation(), Var->getLocation()); 6587 Var->setInvalidDecl(); 6588 return; 6589 } 6590 6591 // Do not attempt to type-check the default initializer for a 6592 // variable with dependent type. 6593 if (Type->isDependentType()) 6594 return; 6595 6596 if (Var->isInvalidDecl()) 6597 return; 6598 6599 if (RequireCompleteType(Var->getLocation(), 6600 Context.getBaseElementType(Type), 6601 diag::err_typecheck_decl_incomplete_type)) { 6602 Var->setInvalidDecl(); 6603 return; 6604 } 6605 6606 // The variable can not have an abstract class type. 6607 if (RequireNonAbstractType(Var->getLocation(), Type, 6608 diag::err_abstract_type_in_decl, 6609 AbstractVariableType)) { 6610 Var->setInvalidDecl(); 6611 return; 6612 } 6613 6614 // Check for jumps past the implicit initializer. C++0x 6615 // clarifies that this applies to a "variable with automatic 6616 // storage duration", not a "local variable". 6617 // C++11 [stmt.dcl]p3 6618 // A program that jumps from a point where a variable with automatic 6619 // storage duration is not in scope to a point where it is in scope is 6620 // ill-formed unless the variable has scalar type, class type with a 6621 // trivial default constructor and a trivial destructor, a cv-qualified 6622 // version of one of these types, or an array of one of the preceding 6623 // types and is declared without an initializer. 6624 if (getLangOpts().CPlusPlus && Var->hasLocalStorage()) { 6625 if (const RecordType *Record 6626 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6627 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6628 // Mark the function for further checking even if the looser rules of 6629 // C++11 do not require such checks, so that we can diagnose 6630 // incompatibilities with C++98. 6631 if (!CXXRecord->isPOD()) 6632 getCurFunction()->setHasBranchProtectedScope(); 6633 } 6634 } 6635 6636 // C++03 [dcl.init]p9: 6637 // If no initializer is specified for an object, and the 6638 // object is of (possibly cv-qualified) non-POD class type (or 6639 // array thereof), the object shall be default-initialized; if 6640 // the object is of const-qualified type, the underlying class 6641 // type shall have a user-declared default 6642 // constructor. Otherwise, if no initializer is specified for 6643 // a non- static object, the object and its subobjects, if 6644 // any, have an indeterminate initial value); if the object 6645 // or any of its subobjects are of const-qualified type, the 6646 // program is ill-formed. 6647 // C++0x [dcl.init]p11: 6648 // If no initializer is specified for an object, the object is 6649 // default-initialized; [...]. 6650 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6651 InitializationKind Kind 6652 = InitializationKind::CreateDefault(Var->getLocation()); 6653 6654 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6655 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6656 MultiExprArg(*this, 0, 0)); 6657 if (Init.isInvalid()) 6658 Var->setInvalidDecl(); 6659 else if (Init.get()) { 6660 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6661 // This is important for template substitution. 6662 Var->setInitStyle(VarDecl::CallInit); 6663 } 6664 6665 CheckCompleteVariableDeclaration(Var); 6666 } 6667} 6668 6669void Sema::ActOnCXXForRangeDecl(Decl *D) { 6670 VarDecl *VD = dyn_cast<VarDecl>(D); 6671 if (!VD) { 6672 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6673 D->setInvalidDecl(); 6674 return; 6675 } 6676 6677 VD->setCXXForRangeDecl(true); 6678 6679 // for-range-declaration cannot be given a storage class specifier. 6680 int Error = -1; 6681 switch (VD->getStorageClassAsWritten()) { 6682 case SC_None: 6683 break; 6684 case SC_Extern: 6685 Error = 0; 6686 break; 6687 case SC_Static: 6688 Error = 1; 6689 break; 6690 case SC_PrivateExtern: 6691 Error = 2; 6692 break; 6693 case SC_Auto: 6694 Error = 3; 6695 break; 6696 case SC_Register: 6697 Error = 4; 6698 break; 6699 case SC_OpenCLWorkGroupLocal: 6700 llvm_unreachable("Unexpected storage class"); 6701 } 6702 if (VD->isConstexpr()) 6703 Error = 5; 6704 if (Error != -1) { 6705 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6706 << VD->getDeclName() << Error; 6707 D->setInvalidDecl(); 6708 } 6709} 6710 6711void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6712 if (var->isInvalidDecl()) return; 6713 6714 // In ARC, don't allow jumps past the implicit initialization of a 6715 // local retaining variable. 6716 if (getLangOpts().ObjCAutoRefCount && 6717 var->hasLocalStorage()) { 6718 switch (var->getType().getObjCLifetime()) { 6719 case Qualifiers::OCL_None: 6720 case Qualifiers::OCL_ExplicitNone: 6721 case Qualifiers::OCL_Autoreleasing: 6722 break; 6723 6724 case Qualifiers::OCL_Weak: 6725 case Qualifiers::OCL_Strong: 6726 getCurFunction()->setHasBranchProtectedScope(); 6727 break; 6728 } 6729 } 6730 6731 // All the following checks are C++ only. 6732 if (!getLangOpts().CPlusPlus) return; 6733 6734 QualType baseType = Context.getBaseElementType(var->getType()); 6735 if (baseType->isDependentType()) return; 6736 6737 // __block variables might require us to capture a copy-initializer. 6738 if (var->hasAttr<BlocksAttr>()) { 6739 // It's currently invalid to ever have a __block variable with an 6740 // array type; should we diagnose that here? 6741 6742 // Regardless, we don't want to ignore array nesting when 6743 // constructing this copy. 6744 QualType type = var->getType(); 6745 6746 if (type->isStructureOrClassType()) { 6747 SourceLocation poi = var->getLocation(); 6748 Expr *varRef =new (Context) DeclRefExpr(var, false, type, VK_LValue, poi); 6749 ExprResult result = 6750 PerformCopyInitialization( 6751 InitializedEntity::InitializeBlock(poi, type, false), 6752 poi, Owned(varRef)); 6753 if (!result.isInvalid()) { 6754 result = MaybeCreateExprWithCleanups(result); 6755 Expr *init = result.takeAs<Expr>(); 6756 Context.setBlockVarCopyInits(var, init); 6757 } 6758 } 6759 } 6760 6761 Expr *Init = var->getInit(); 6762 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6763 6764 if (!var->getDeclContext()->isDependentContext() && Init) { 6765 if (IsGlobal && !var->isConstexpr() && 6766 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6767 var->getLocation()) 6768 != DiagnosticsEngine::Ignored && 6769 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 6770 Diag(var->getLocation(), diag::warn_global_constructor) 6771 << Init->getSourceRange(); 6772 6773 if (var->isConstexpr()) { 6774 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 6775 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 6776 SourceLocation DiagLoc = var->getLocation(); 6777 // If the note doesn't add any useful information other than a source 6778 // location, fold it into the primary diagnostic. 6779 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 6780 diag::note_invalid_subexpr_in_const_expr) { 6781 DiagLoc = Notes[0].first; 6782 Notes.clear(); 6783 } 6784 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 6785 << var << Init->getSourceRange(); 6786 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 6787 Diag(Notes[I].first, Notes[I].second); 6788 } 6789 } else if (var->isUsableInConstantExpressions(Context)) { 6790 // Check whether the initializer of a const variable of integral or 6791 // enumeration type is an ICE now, since we can't tell whether it was 6792 // initialized by a constant expression if we check later. 6793 var->checkInitIsICE(); 6794 } 6795 } 6796 6797 // Require the destructor. 6798 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6799 FinalizeVarWithDestructor(var, recordType); 6800} 6801 6802/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6803/// any semantic actions necessary after any initializer has been attached. 6804void 6805Sema::FinalizeDeclaration(Decl *ThisDecl) { 6806 // Note that we are no longer parsing the initializer for this declaration. 6807 ParsingInitForAutoVars.erase(ThisDecl); 6808} 6809 6810Sema::DeclGroupPtrTy 6811Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6812 Decl **Group, unsigned NumDecls) { 6813 SmallVector<Decl*, 8> Decls; 6814 6815 if (DS.isTypeSpecOwned()) 6816 Decls.push_back(DS.getRepAsDecl()); 6817 6818 for (unsigned i = 0; i != NumDecls; ++i) 6819 if (Decl *D = Group[i]) 6820 Decls.push_back(D); 6821 6822 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6823 DS.getTypeSpecType() == DeclSpec::TST_auto); 6824} 6825 6826/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6827/// group, performing any necessary semantic checking. 6828Sema::DeclGroupPtrTy 6829Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6830 bool TypeMayContainAuto) { 6831 // C++0x [dcl.spec.auto]p7: 6832 // If the type deduced for the template parameter U is not the same in each 6833 // deduction, the program is ill-formed. 6834 // FIXME: When initializer-list support is added, a distinction is needed 6835 // between the deduced type U and the deduced type which 'auto' stands for. 6836 // auto a = 0, b = { 1, 2, 3 }; 6837 // is legal because the deduced type U is 'int' in both cases. 6838 if (TypeMayContainAuto && NumDecls > 1) { 6839 QualType Deduced; 6840 CanQualType DeducedCanon; 6841 VarDecl *DeducedDecl = 0; 6842 for (unsigned i = 0; i != NumDecls; ++i) { 6843 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6844 AutoType *AT = D->getType()->getContainedAutoType(); 6845 // Don't reissue diagnostics when instantiating a template. 6846 if (AT && D->isInvalidDecl()) 6847 break; 6848 if (AT && AT->isDeduced()) { 6849 QualType U = AT->getDeducedType(); 6850 CanQualType UCanon = Context.getCanonicalType(U); 6851 if (Deduced.isNull()) { 6852 Deduced = U; 6853 DeducedCanon = UCanon; 6854 DeducedDecl = D; 6855 } else if (DeducedCanon != UCanon) { 6856 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6857 diag::err_auto_different_deductions) 6858 << Deduced << DeducedDecl->getDeclName() 6859 << U << D->getDeclName() 6860 << DeducedDecl->getInit()->getSourceRange() 6861 << D->getInit()->getSourceRange(); 6862 D->setInvalidDecl(); 6863 break; 6864 } 6865 } 6866 } 6867 } 6868 } 6869 6870 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6871} 6872 6873 6874/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6875/// to introduce parameters into function prototype scope. 6876Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6877 const DeclSpec &DS = D.getDeclSpec(); 6878 6879 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6880 // C++03 [dcl.stc]p2 also permits 'auto'. 6881 VarDecl::StorageClass StorageClass = SC_None; 6882 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6883 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6884 StorageClass = SC_Register; 6885 StorageClassAsWritten = SC_Register; 6886 } else if (getLangOpts().CPlusPlus && 6887 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6888 StorageClass = SC_Auto; 6889 StorageClassAsWritten = SC_Auto; 6890 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6891 Diag(DS.getStorageClassSpecLoc(), 6892 diag::err_invalid_storage_class_in_func_decl); 6893 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6894 } 6895 6896 if (D.getDeclSpec().isThreadSpecified()) 6897 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6898 if (D.getDeclSpec().isConstexprSpecified()) 6899 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6900 << 0; 6901 6902 DiagnoseFunctionSpecifiers(D); 6903 6904 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6905 QualType parmDeclType = TInfo->getType(); 6906 6907 if (getLangOpts().CPlusPlus) { 6908 // Check that there are no default arguments inside the type of this 6909 // parameter. 6910 CheckExtraCXXDefaultArguments(D); 6911 6912 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6913 if (D.getCXXScopeSpec().isSet()) { 6914 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6915 << D.getCXXScopeSpec().getRange(); 6916 D.getCXXScopeSpec().clear(); 6917 } 6918 } 6919 6920 // Ensure we have a valid name 6921 IdentifierInfo *II = 0; 6922 if (D.hasName()) { 6923 II = D.getIdentifier(); 6924 if (!II) { 6925 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6926 << GetNameForDeclarator(D).getName().getAsString(); 6927 D.setInvalidType(true); 6928 } 6929 } 6930 6931 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6932 if (II) { 6933 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6934 ForRedeclaration); 6935 LookupName(R, S); 6936 if (R.isSingleResult()) { 6937 NamedDecl *PrevDecl = R.getFoundDecl(); 6938 if (PrevDecl->isTemplateParameter()) { 6939 // Maybe we will complain about the shadowed template parameter. 6940 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6941 // Just pretend that we didn't see the previous declaration. 6942 PrevDecl = 0; 6943 } else if (S->isDeclScope(PrevDecl)) { 6944 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6945 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6946 6947 // Recover by removing the name 6948 II = 0; 6949 D.SetIdentifier(0, D.getIdentifierLoc()); 6950 D.setInvalidType(true); 6951 } 6952 } 6953 } 6954 6955 // Temporarily put parameter variables in the translation unit, not 6956 // the enclosing context. This prevents them from accidentally 6957 // looking like class members in C++. 6958 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6959 D.getLocStart(), 6960 D.getIdentifierLoc(), II, 6961 parmDeclType, TInfo, 6962 StorageClass, StorageClassAsWritten); 6963 6964 if (D.isInvalidType()) 6965 New->setInvalidDecl(); 6966 6967 assert(S->isFunctionPrototypeScope()); 6968 assert(S->getFunctionPrototypeDepth() >= 1); 6969 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6970 S->getNextFunctionPrototypeIndex()); 6971 6972 // Add the parameter declaration into this scope. 6973 S->AddDecl(New); 6974 if (II) 6975 IdResolver.AddDecl(New); 6976 6977 ProcessDeclAttributes(S, New, D); 6978 6979 if (D.getDeclSpec().isModulePrivateSpecified()) 6980 Diag(New->getLocation(), diag::err_module_private_local) 6981 << 1 << New->getDeclName() 6982 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6983 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6984 6985 if (New->hasAttr<BlocksAttr>()) { 6986 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6987 } 6988 return New; 6989} 6990 6991/// \brief Synthesizes a variable for a parameter arising from a 6992/// typedef. 6993ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6994 SourceLocation Loc, 6995 QualType T) { 6996 /* FIXME: setting StartLoc == Loc. 6997 Would it be worth to modify callers so as to provide proper source 6998 location for the unnamed parameters, embedding the parameter's type? */ 6999 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 7000 T, Context.getTrivialTypeSourceInfo(T, Loc), 7001 SC_None, SC_None, 0); 7002 Param->setImplicit(); 7003 return Param; 7004} 7005 7006void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 7007 ParmVarDecl * const *ParamEnd) { 7008 // Don't diagnose unused-parameter errors in template instantiations; we 7009 // will already have done so in the template itself. 7010 if (!ActiveTemplateInstantiations.empty()) 7011 return; 7012 7013 for (; Param != ParamEnd; ++Param) { 7014 if (!(*Param)->isReferenced() && (*Param)->getDeclName() && 7015 !(*Param)->hasAttr<UnusedAttr>()) { 7016 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 7017 << (*Param)->getDeclName(); 7018 } 7019 } 7020} 7021 7022void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 7023 ParmVarDecl * const *ParamEnd, 7024 QualType ReturnTy, 7025 NamedDecl *D) { 7026 if (LangOpts.NumLargeByValueCopy == 0) // No check. 7027 return; 7028 7029 // Warn if the return value is pass-by-value and larger than the specified 7030 // threshold. 7031 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 7032 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 7033 if (Size > LangOpts.NumLargeByValueCopy) 7034 Diag(D->getLocation(), diag::warn_return_value_size) 7035 << D->getDeclName() << Size; 7036 } 7037 7038 // Warn if any parameter is pass-by-value and larger than the specified 7039 // threshold. 7040 for (; Param != ParamEnd; ++Param) { 7041 QualType T = (*Param)->getType(); 7042 if (T->isDependentType() || !T.isPODType(Context)) 7043 continue; 7044 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 7045 if (Size > LangOpts.NumLargeByValueCopy) 7046 Diag((*Param)->getLocation(), diag::warn_parameter_size) 7047 << (*Param)->getDeclName() << Size; 7048 } 7049} 7050 7051ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 7052 SourceLocation NameLoc, IdentifierInfo *Name, 7053 QualType T, TypeSourceInfo *TSInfo, 7054 VarDecl::StorageClass StorageClass, 7055 VarDecl::StorageClass StorageClassAsWritten) { 7056 // In ARC, infer a lifetime qualifier for appropriate parameter types. 7057 if (getLangOpts().ObjCAutoRefCount && 7058 T.getObjCLifetime() == Qualifiers::OCL_None && 7059 T->isObjCLifetimeType()) { 7060 7061 Qualifiers::ObjCLifetime lifetime; 7062 7063 // Special cases for arrays: 7064 // - if it's const, use __unsafe_unretained 7065 // - otherwise, it's an error 7066 if (T->isArrayType()) { 7067 if (!T.isConstQualified()) { 7068 DelayedDiagnostics.add( 7069 sema::DelayedDiagnostic::makeForbiddenType( 7070 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 7071 } 7072 lifetime = Qualifiers::OCL_ExplicitNone; 7073 } else { 7074 lifetime = T->getObjCARCImplicitLifetime(); 7075 } 7076 T = Context.getLifetimeQualifiedType(T, lifetime); 7077 } 7078 7079 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 7080 Context.getAdjustedParameterType(T), 7081 TSInfo, 7082 StorageClass, StorageClassAsWritten, 7083 0); 7084 7085 // Parameters can not be abstract class types. 7086 // For record types, this is done by the AbstractClassUsageDiagnoser once 7087 // the class has been completely parsed. 7088 if (!CurContext->isRecord() && 7089 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 7090 AbstractParamType)) 7091 New->setInvalidDecl(); 7092 7093 // Parameter declarators cannot be interface types. All ObjC objects are 7094 // passed by reference. 7095 if (T->isObjCObjectType()) { 7096 Diag(NameLoc, 7097 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 7098 << FixItHint::CreateInsertion(NameLoc, "*"); 7099 T = Context.getObjCObjectPointerType(T); 7100 New->setType(T); 7101 } 7102 7103 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 7104 // duration shall not be qualified by an address-space qualifier." 7105 // Since all parameters have automatic store duration, they can not have 7106 // an address space. 7107 if (T.getAddressSpace() != 0) { 7108 Diag(NameLoc, diag::err_arg_with_address_space); 7109 New->setInvalidDecl(); 7110 } 7111 7112 return New; 7113} 7114 7115void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 7116 SourceLocation LocAfterDecls) { 7117 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 7118 7119 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 7120 // for a K&R function. 7121 if (!FTI.hasPrototype) { 7122 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 7123 --i; 7124 if (FTI.ArgInfo[i].Param == 0) { 7125 SmallString<256> Code; 7126 llvm::raw_svector_ostream(Code) << " int " 7127 << FTI.ArgInfo[i].Ident->getName() 7128 << ";\n"; 7129 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 7130 << FTI.ArgInfo[i].Ident 7131 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 7132 7133 // Implicitly declare the argument as type 'int' for lack of a better 7134 // type. 7135 AttributeFactory attrs; 7136 DeclSpec DS(attrs); 7137 const char* PrevSpec; // unused 7138 unsigned DiagID; // unused 7139 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 7140 PrevSpec, DiagID); 7141 Declarator ParamD(DS, Declarator::KNRTypeListContext); 7142 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 7143 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 7144 } 7145 } 7146 } 7147} 7148 7149Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 7150 Declarator &D) { 7151 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 7152 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 7153 Scope *ParentScope = FnBodyScope->getParent(); 7154 7155 D.setFunctionDefinitionKind(FDK_Definition); 7156 Decl *DP = HandleDeclarator(ParentScope, D, 7157 MultiTemplateParamsArg(*this)); 7158 return ActOnStartOfFunctionDef(FnBodyScope, DP); 7159} 7160 7161static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 7162 // Don't warn about invalid declarations. 7163 if (FD->isInvalidDecl()) 7164 return false; 7165 7166 // Or declarations that aren't global. 7167 if (!FD->isGlobal()) 7168 return false; 7169 7170 // Don't warn about C++ member functions. 7171 if (isa<CXXMethodDecl>(FD)) 7172 return false; 7173 7174 // Don't warn about 'main'. 7175 if (FD->isMain()) 7176 return false; 7177 7178 // Don't warn about inline functions. 7179 if (FD->isInlined()) 7180 return false; 7181 7182 // Don't warn about function templates. 7183 if (FD->getDescribedFunctionTemplate()) 7184 return false; 7185 7186 // Don't warn about function template specializations. 7187 if (FD->isFunctionTemplateSpecialization()) 7188 return false; 7189 7190 bool MissingPrototype = true; 7191 for (const FunctionDecl *Prev = FD->getPreviousDecl(); 7192 Prev; Prev = Prev->getPreviousDecl()) { 7193 // Ignore any declarations that occur in function or method 7194 // scope, because they aren't visible from the header. 7195 if (Prev->getDeclContext()->isFunctionOrMethod()) 7196 continue; 7197 7198 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 7199 break; 7200 } 7201 7202 return MissingPrototype; 7203} 7204 7205void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 7206 // Don't complain if we're in GNU89 mode and the previous definition 7207 // was an extern inline function. 7208 const FunctionDecl *Definition; 7209 if (FD->isDefined(Definition) && 7210 !canRedefineFunction(Definition, getLangOpts())) { 7211 if (getLangOpts().GNUMode && Definition->isInlineSpecified() && 7212 Definition->getStorageClass() == SC_Extern) 7213 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 7214 << FD->getDeclName() << getLangOpts().CPlusPlus; 7215 else 7216 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 7217 Diag(Definition->getLocation(), diag::note_previous_definition); 7218 } 7219} 7220 7221Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 7222 // Clear the last template instantiation error context. 7223 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 7224 7225 if (!D) 7226 return D; 7227 FunctionDecl *FD = 0; 7228 7229 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 7230 FD = FunTmpl->getTemplatedDecl(); 7231 else 7232 FD = cast<FunctionDecl>(D); 7233 7234 // Enter a new function scope 7235 PushFunctionScope(); 7236 7237 // See if this is a redefinition. 7238 if (!FD->isLateTemplateParsed()) 7239 CheckForFunctionRedefinition(FD); 7240 7241 // Builtin functions cannot be defined. 7242 if (unsigned BuiltinID = FD->getBuiltinID()) { 7243 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7244 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7245 FD->setInvalidDecl(); 7246 } 7247 } 7248 7249 // The return type of a function definition must be complete 7250 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7251 QualType ResultType = FD->getResultType(); 7252 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7253 !FD->isInvalidDecl() && 7254 RequireCompleteType(FD->getLocation(), ResultType, 7255 diag::err_func_def_incomplete_result)) 7256 FD->setInvalidDecl(); 7257 7258 // GNU warning -Wmissing-prototypes: 7259 // Warn if a global function is defined without a previous 7260 // prototype declaration. This warning is issued even if the 7261 // definition itself provides a prototype. The aim is to detect 7262 // global functions that fail to be declared in header files. 7263 if (ShouldWarnAboutMissingPrototype(FD)) 7264 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7265 7266 if (FnBodyScope) 7267 PushDeclContext(FnBodyScope, FD); 7268 7269 // Check the validity of our function parameters 7270 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7271 /*CheckParameterNames=*/true); 7272 7273 // Introduce our parameters into the function scope 7274 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7275 ParmVarDecl *Param = FD->getParamDecl(p); 7276 Param->setOwningFunction(FD); 7277 7278 // If this has an identifier, add it to the scope stack. 7279 if (Param->getIdentifier() && FnBodyScope) { 7280 CheckShadow(FnBodyScope, Param); 7281 7282 PushOnScopeChains(Param, FnBodyScope); 7283 } 7284 } 7285 7286 // If we had any tags defined in the function prototype, 7287 // introduce them into the function scope. 7288 if (FnBodyScope) { 7289 for (llvm::ArrayRef<NamedDecl*>::iterator I = FD->getDeclsInPrototypeScope().begin(), 7290 E = FD->getDeclsInPrototypeScope().end(); I != E; ++I) { 7291 NamedDecl *D = *I; 7292 7293 // Some of these decls (like enums) may have been pinned to the translation unit 7294 // for lack of a real context earlier. If so, remove from the translation unit 7295 // and reattach to the current context. 7296 if (D->getLexicalDeclContext() == Context.getTranslationUnitDecl()) { 7297 // Is the decl actually in the context? 7298 for (DeclContext::decl_iterator DI = Context.getTranslationUnitDecl()->decls_begin(), 7299 DE = Context.getTranslationUnitDecl()->decls_end(); DI != DE; ++DI) { 7300 if (*DI == D) { 7301 Context.getTranslationUnitDecl()->removeDecl(D); 7302 break; 7303 } 7304 } 7305 // Either way, reassign the lexical decl context to our FunctionDecl. 7306 D->setLexicalDeclContext(CurContext); 7307 } 7308 7309 // If the decl has a non-null name, make accessible in the current scope. 7310 if (!D->getName().empty()) 7311 PushOnScopeChains(D, FnBodyScope, /*AddToContext=*/false); 7312 7313 // Similarly, dive into enums and fish their constants out, making them 7314 // accessible in this scope. 7315 if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) { 7316 for (EnumDecl::enumerator_iterator EI = ED->enumerator_begin(), 7317 EE = ED->enumerator_end(); EI != EE; ++EI) 7318 PushOnScopeChains(*EI, FnBodyScope, /*AddToContext=*/false); 7319 } 7320 } 7321 } 7322 7323 // Checking attributes of current function definition 7324 // dllimport attribute. 7325 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7326 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7327 // dllimport attribute cannot be directly applied to definition. 7328 // Microsoft accepts dllimport for functions defined within class scope. 7329 if (!DA->isInherited() && 7330 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7331 Diag(FD->getLocation(), 7332 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7333 << "dllimport"; 7334 FD->setInvalidDecl(); 7335 return FD; 7336 } 7337 7338 // Visual C++ appears to not think this is an issue, so only issue 7339 // a warning when Microsoft extensions are disabled. 7340 if (!LangOpts.MicrosoftExt) { 7341 // If a symbol previously declared dllimport is later defined, the 7342 // attribute is ignored in subsequent references, and a warning is 7343 // emitted. 7344 Diag(FD->getLocation(), 7345 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7346 << FD->getName() << "dllimport"; 7347 } 7348 } 7349 return FD; 7350} 7351 7352/// \brief Given the set of return statements within a function body, 7353/// compute the variables that are subject to the named return value 7354/// optimization. 7355/// 7356/// Each of the variables that is subject to the named return value 7357/// optimization will be marked as NRVO variables in the AST, and any 7358/// return statement that has a marked NRVO variable as its NRVO candidate can 7359/// use the named return value optimization. 7360/// 7361/// This function applies a very simplistic algorithm for NRVO: if every return 7362/// statement in the function has the same NRVO candidate, that candidate is 7363/// the NRVO variable. 7364/// 7365/// FIXME: Employ a smarter algorithm that accounts for multiple return 7366/// statements and the lifetimes of the NRVO candidates. We should be able to 7367/// find a maximal set of NRVO variables. 7368void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7369 ReturnStmt **Returns = Scope->Returns.data(); 7370 7371 const VarDecl *NRVOCandidate = 0; 7372 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7373 if (!Returns[I]->getNRVOCandidate()) 7374 return; 7375 7376 if (!NRVOCandidate) 7377 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7378 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7379 return; 7380 } 7381 7382 if (NRVOCandidate) 7383 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7384} 7385 7386Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7387 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7388} 7389 7390Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7391 bool IsInstantiation) { 7392 FunctionDecl *FD = 0; 7393 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7394 if (FunTmpl) 7395 FD = FunTmpl->getTemplatedDecl(); 7396 else 7397 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7398 7399 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7400 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7401 7402 if (FD) { 7403 FD->setBody(Body); 7404 7405 // If the function implicitly returns zero (like 'main') or is naked, 7406 // don't complain about missing return statements. 7407 if (FD->hasImplicitReturnZero() || FD->hasAttr<NakedAttr>()) 7408 WP.disableCheckFallThrough(); 7409 7410 // MSVC permits the use of pure specifier (=0) on function definition, 7411 // defined at class scope, warn about this non standard construct. 7412 if (getLangOpts().MicrosoftExt && FD->isPure()) 7413 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7414 7415 if (!FD->isInvalidDecl()) { 7416 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7417 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7418 FD->getResultType(), FD); 7419 7420 // If this is a constructor, we need a vtable. 7421 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7422 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7423 7424 computeNRVO(Body, getCurFunction()); 7425 } 7426 7427 assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) && 7428 "Function parsing confused"); 7429 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7430 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7431 MD->setBody(Body); 7432 if (Body) 7433 MD->setEndLoc(Body->getLocEnd()); 7434 if (!MD->isInvalidDecl()) { 7435 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7436 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7437 MD->getResultType(), MD); 7438 7439 if (Body) 7440 computeNRVO(Body, getCurFunction()); 7441 } 7442 if (ObjCShouldCallSuperDealloc) { 7443 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7444 ObjCShouldCallSuperDealloc = false; 7445 } 7446 if (ObjCShouldCallSuperFinalize) { 7447 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7448 ObjCShouldCallSuperFinalize = false; 7449 } 7450 } else { 7451 return 0; 7452 } 7453 7454 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7455 "ObjC methods, which should have been handled in the block above."); 7456 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7457 "ObjC methods, which should have been handled in the block above."); 7458 7459 // Verify and clean out per-function state. 7460 if (Body) { 7461 // C++ constructors that have function-try-blocks can't have return 7462 // statements in the handlers of that block. (C++ [except.handle]p14) 7463 // Verify this. 7464 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7465 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7466 7467 // Verify that gotos and switch cases don't jump into scopes illegally. 7468 if (getCurFunction()->NeedsScopeChecking() && 7469 !dcl->isInvalidDecl() && 7470 !hasAnyUnrecoverableErrorsInThisFunction()) 7471 DiagnoseInvalidJumps(Body); 7472 7473 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7474 if (!Destructor->getParent()->isDependentType()) 7475 CheckDestructor(Destructor); 7476 7477 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7478 Destructor->getParent()); 7479 } 7480 7481 // If any errors have occurred, clear out any temporaries that may have 7482 // been leftover. This ensures that these temporaries won't be picked up for 7483 // deletion in some later function. 7484 if (PP.getDiagnostics().hasErrorOccurred() || 7485 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7486 DiscardCleanupsInEvaluationContext(); 7487 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7488 // Since the body is valid, issue any analysis-based warnings that are 7489 // enabled. 7490 ActivePolicy = &WP; 7491 } 7492 7493 if (!IsInstantiation && FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7494 (!CheckConstexprFunctionDecl(FD) || 7495 !CheckConstexprFunctionBody(FD, Body))) 7496 FD->setInvalidDecl(); 7497 7498 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7499 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7500 assert(MaybeODRUseExprs.empty() && 7501 "Leftover expressions for odr-use checking"); 7502 } 7503 7504 if (!IsInstantiation) 7505 PopDeclContext(); 7506 7507 PopFunctionScopeInfo(ActivePolicy, dcl); 7508 7509 // If any errors have occurred, clear out any temporaries that may have 7510 // been leftover. This ensures that these temporaries won't be picked up for 7511 // deletion in some later function. 7512 if (getDiagnostics().hasErrorOccurred()) { 7513 DiscardCleanupsInEvaluationContext(); 7514 } 7515 7516 return dcl; 7517} 7518 7519 7520/// When we finish delayed parsing of an attribute, we must attach it to the 7521/// relevant Decl. 7522void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7523 ParsedAttributes &Attrs) { 7524 // Always attach attributes to the underlying decl. 7525 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) 7526 D = TD->getTemplatedDecl(); 7527 ProcessDeclAttributeList(S, D, Attrs.getList()); 7528} 7529 7530 7531/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7532/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7533NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7534 IdentifierInfo &II, Scope *S) { 7535 // Before we produce a declaration for an implicitly defined 7536 // function, see whether there was a locally-scoped declaration of 7537 // this name as a function or variable. If so, use that 7538 // (non-visible) declaration, and complain about it. 7539 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7540 = findLocallyScopedExternalDecl(&II); 7541 if (Pos != LocallyScopedExternalDecls.end()) { 7542 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7543 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7544 return Pos->second; 7545 } 7546 7547 // Extension in C99. Legal in C90, but warn about it. 7548 unsigned diag_id; 7549 if (II.getName().startswith("__builtin_")) 7550 diag_id = diag::warn_builtin_unknown; 7551 else if (getLangOpts().C99) 7552 diag_id = diag::ext_implicit_function_decl; 7553 else 7554 diag_id = diag::warn_implicit_function_decl; 7555 Diag(Loc, diag_id) << &II; 7556 7557 // Because typo correction is expensive, only do it if the implicit 7558 // function declaration is going to be treated as an error. 7559 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7560 TypoCorrection Corrected; 7561 DeclFilterCCC<FunctionDecl> Validator; 7562 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7563 LookupOrdinaryName, S, 0, Validator))) { 7564 std::string CorrectedStr = Corrected.getAsString(getLangOpts()); 7565 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOpts()); 7566 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>(); 7567 7568 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7569 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7570 7571 if (Func->getLocation().isValid() 7572 && !II.getName().startswith("__builtin_")) 7573 Diag(Func->getLocation(), diag::note_previous_decl) 7574 << CorrectedQuotedStr; 7575 } 7576 } 7577 7578 // Set a Declarator for the implicit definition: int foo(); 7579 const char *Dummy; 7580 AttributeFactory attrFactory; 7581 DeclSpec DS(attrFactory); 7582 unsigned DiagID; 7583 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7584 (void)Error; // Silence warning. 7585 assert(!Error && "Error setting up implicit decl!"); 7586 Declarator D(DS, Declarator::BlockContext); 7587 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7588 0, 0, true, SourceLocation(), 7589 SourceLocation(), SourceLocation(), 7590 SourceLocation(), 7591 EST_None, SourceLocation(), 7592 0, 0, 0, 0, Loc, Loc, D), 7593 DS.getAttributes(), 7594 SourceLocation()); 7595 D.SetIdentifier(&II, Loc); 7596 7597 // Insert this function into translation-unit scope. 7598 7599 DeclContext *PrevDC = CurContext; 7600 CurContext = Context.getTranslationUnitDecl(); 7601 7602 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7603 FD->setImplicit(); 7604 7605 CurContext = PrevDC; 7606 7607 AddKnownFunctionAttributes(FD); 7608 7609 return FD; 7610} 7611 7612/// \brief Adds any function attributes that we know a priori based on 7613/// the declaration of this function. 7614/// 7615/// These attributes can apply both to implicitly-declared builtins 7616/// (like __builtin___printf_chk) or to library-declared functions 7617/// like NSLog or printf. 7618/// 7619/// We need to check for duplicate attributes both here and where user-written 7620/// attributes are applied to declarations. 7621void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7622 if (FD->isInvalidDecl()) 7623 return; 7624 7625 // If this is a built-in function, map its builtin attributes to 7626 // actual attributes. 7627 if (unsigned BuiltinID = FD->getBuiltinID()) { 7628 // Handle printf-formatting attributes. 7629 unsigned FormatIdx; 7630 bool HasVAListArg; 7631 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7632 if (!FD->getAttr<FormatAttr>()) { 7633 const char *fmt = "printf"; 7634 unsigned int NumParams = FD->getNumParams(); 7635 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf) 7636 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType()) 7637 fmt = "NSString"; 7638 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7639 fmt, FormatIdx+1, 7640 HasVAListArg ? 0 : FormatIdx+2)); 7641 } 7642 } 7643 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7644 HasVAListArg)) { 7645 if (!FD->getAttr<FormatAttr>()) 7646 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7647 "scanf", FormatIdx+1, 7648 HasVAListArg ? 0 : FormatIdx+2)); 7649 } 7650 7651 // Mark const if we don't care about errno and that is the only 7652 // thing preventing the function from being const. This allows 7653 // IRgen to use LLVM intrinsics for such functions. 7654 if (!getLangOpts().MathErrno && 7655 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7656 if (!FD->getAttr<ConstAttr>()) 7657 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7658 } 7659 7660 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7661 !FD->getAttr<ReturnsTwiceAttr>()) 7662 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7663 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7664 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7665 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7666 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7667 } 7668 7669 IdentifierInfo *Name = FD->getIdentifier(); 7670 if (!Name) 7671 return; 7672 if ((!getLangOpts().CPlusPlus && 7673 FD->getDeclContext()->isTranslationUnit()) || 7674 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7675 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7676 LinkageSpecDecl::lang_c)) { 7677 // Okay: this could be a libc/libm/Objective-C function we know 7678 // about. 7679 } else 7680 return; 7681 7682 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7683 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7684 // target-specific builtins, perhaps? 7685 if (!FD->getAttr<FormatAttr>()) 7686 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7687 "printf", 2, 7688 Name->isStr("vasprintf") ? 0 : 3)); 7689 } 7690} 7691 7692TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7693 TypeSourceInfo *TInfo) { 7694 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7695 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7696 7697 if (!TInfo) { 7698 assert(D.isInvalidType() && "no declarator info for valid type"); 7699 TInfo = Context.getTrivialTypeSourceInfo(T); 7700 } 7701 7702 // Scope manipulation handled by caller. 7703 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7704 D.getLocStart(), 7705 D.getIdentifierLoc(), 7706 D.getIdentifier(), 7707 TInfo); 7708 7709 // Bail out immediately if we have an invalid declaration. 7710 if (D.isInvalidType()) { 7711 NewTD->setInvalidDecl(); 7712 return NewTD; 7713 } 7714 7715 if (D.getDeclSpec().isModulePrivateSpecified()) { 7716 if (CurContext->isFunctionOrMethod()) 7717 Diag(NewTD->getLocation(), diag::err_module_private_local) 7718 << 2 << NewTD->getDeclName() 7719 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7720 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7721 else 7722 NewTD->setModulePrivate(); 7723 } 7724 7725 // C++ [dcl.typedef]p8: 7726 // If the typedef declaration defines an unnamed class (or 7727 // enum), the first typedef-name declared by the declaration 7728 // to be that class type (or enum type) is used to denote the 7729 // class type (or enum type) for linkage purposes only. 7730 // We need to check whether the type was declared in the declaration. 7731 switch (D.getDeclSpec().getTypeSpecType()) { 7732 case TST_enum: 7733 case TST_struct: 7734 case TST_union: 7735 case TST_class: { 7736 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7737 7738 // Do nothing if the tag is not anonymous or already has an 7739 // associated typedef (from an earlier typedef in this decl group). 7740 if (tagFromDeclSpec->getIdentifier()) break; 7741 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7742 7743 // A well-formed anonymous tag must always be a TUK_Definition. 7744 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7745 7746 // The type must match the tag exactly; no qualifiers allowed. 7747 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7748 break; 7749 7750 // Otherwise, set this is the anon-decl typedef for the tag. 7751 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7752 break; 7753 } 7754 7755 default: 7756 break; 7757 } 7758 7759 return NewTD; 7760} 7761 7762 7763/// \brief Check that this is a valid underlying type for an enum declaration. 7764bool Sema::CheckEnumUnderlyingType(TypeSourceInfo *TI) { 7765 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7766 QualType T = TI->getType(); 7767 7768 if (T->isDependentType() || T->isIntegralType(Context)) 7769 return false; 7770 7771 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) << T; 7772 return true; 7773} 7774 7775/// Check whether this is a valid redeclaration of a previous enumeration. 7776/// \return true if the redeclaration was invalid. 7777bool Sema::CheckEnumRedeclaration(SourceLocation EnumLoc, bool IsScoped, 7778 QualType EnumUnderlyingTy, 7779 const EnumDecl *Prev) { 7780 bool IsFixed = !EnumUnderlyingTy.isNull(); 7781 7782 if (IsScoped != Prev->isScoped()) { 7783 Diag(EnumLoc, diag::err_enum_redeclare_scoped_mismatch) 7784 << Prev->isScoped(); 7785 Diag(Prev->getLocation(), diag::note_previous_use); 7786 return true; 7787 } 7788 7789 if (IsFixed && Prev->isFixed()) { 7790 if (!EnumUnderlyingTy->isDependentType() && 7791 !Prev->getIntegerType()->isDependentType() && 7792 !Context.hasSameUnqualifiedType(EnumUnderlyingTy, 7793 Prev->getIntegerType())) { 7794 Diag(EnumLoc, diag::err_enum_redeclare_type_mismatch) 7795 << EnumUnderlyingTy << Prev->getIntegerType(); 7796 Diag(Prev->getLocation(), diag::note_previous_use); 7797 return true; 7798 } 7799 } else if (IsFixed != Prev->isFixed()) { 7800 Diag(EnumLoc, diag::err_enum_redeclare_fixed_mismatch) 7801 << Prev->isFixed(); 7802 Diag(Prev->getLocation(), diag::note_previous_use); 7803 return true; 7804 } 7805 7806 return false; 7807} 7808 7809/// \brief Determine whether a tag with a given kind is acceptable 7810/// as a redeclaration of the given tag declaration. 7811/// 7812/// \returns true if the new tag kind is acceptable, false otherwise. 7813bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7814 TagTypeKind NewTag, bool isDefinition, 7815 SourceLocation NewTagLoc, 7816 const IdentifierInfo &Name) { 7817 // C++ [dcl.type.elab]p3: 7818 // The class-key or enum keyword present in the 7819 // elaborated-type-specifier shall agree in kind with the 7820 // declaration to which the name in the elaborated-type-specifier 7821 // refers. This rule also applies to the form of 7822 // elaborated-type-specifier that declares a class-name or 7823 // friend class since it can be construed as referring to the 7824 // definition of the class. Thus, in any 7825 // elaborated-type-specifier, the enum keyword shall be used to 7826 // refer to an enumeration (7.2), the union class-key shall be 7827 // used to refer to a union (clause 9), and either the class or 7828 // struct class-key shall be used to refer to a class (clause 9) 7829 // declared using the class or struct class-key. 7830 TagTypeKind OldTag = Previous->getTagKind(); 7831 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7832 if (OldTag == NewTag) 7833 return true; 7834 7835 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7836 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7837 // Warn about the struct/class tag mismatch. 7838 bool isTemplate = false; 7839 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7840 isTemplate = Record->getDescribedClassTemplate(); 7841 7842 if (!ActiveTemplateInstantiations.empty()) { 7843 // In a template instantiation, do not offer fix-its for tag mismatches 7844 // since they usually mess up the template instead of fixing the problem. 7845 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7846 << (NewTag == TTK_Class) << isTemplate << &Name; 7847 return true; 7848 } 7849 7850 if (isDefinition) { 7851 // On definitions, check previous tags and issue a fix-it for each 7852 // one that doesn't match the current tag. 7853 if (Previous->getDefinition()) { 7854 // Don't suggest fix-its for redefinitions. 7855 return true; 7856 } 7857 7858 bool previousMismatch = false; 7859 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7860 E(Previous->redecls_end()); I != E; ++I) { 7861 if (I->getTagKind() != NewTag) { 7862 if (!previousMismatch) { 7863 previousMismatch = true; 7864 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7865 << (NewTag == TTK_Class) << isTemplate << &Name; 7866 } 7867 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7868 << (NewTag == TTK_Class) 7869 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7870 NewTag == TTK_Class? 7871 "class" : "struct"); 7872 } 7873 } 7874 return true; 7875 } 7876 7877 // Check for a previous definition. If current tag and definition 7878 // are same type, do nothing. If no definition, but disagree with 7879 // with previous tag type, give a warning, but no fix-it. 7880 const TagDecl *Redecl = Previous->getDefinition() ? 7881 Previous->getDefinition() : Previous; 7882 if (Redecl->getTagKind() == NewTag) { 7883 return true; 7884 } 7885 7886 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7887 << (NewTag == TTK_Class) 7888 << isTemplate << &Name; 7889 Diag(Redecl->getLocation(), diag::note_previous_use); 7890 7891 // If there is a previous defintion, suggest a fix-it. 7892 if (Previous->getDefinition()) { 7893 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7894 << (Redecl->getTagKind() == TTK_Class) 7895 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7896 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7897 } 7898 7899 return true; 7900 } 7901 return false; 7902} 7903 7904/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7905/// former case, Name will be non-null. In the later case, Name will be null. 7906/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7907/// reference/declaration/definition of a tag. 7908Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7909 SourceLocation KWLoc, CXXScopeSpec &SS, 7910 IdentifierInfo *Name, SourceLocation NameLoc, 7911 AttributeList *Attr, AccessSpecifier AS, 7912 SourceLocation ModulePrivateLoc, 7913 MultiTemplateParamsArg TemplateParameterLists, 7914 bool &OwnedDecl, bool &IsDependent, 7915 SourceLocation ScopedEnumKWLoc, 7916 bool ScopedEnumUsesClassTag, 7917 TypeResult UnderlyingType) { 7918 // If this is not a definition, it must have a name. 7919 assert((Name != 0 || TUK == TUK_Definition) && 7920 "Nameless record must be a definition!"); 7921 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7922 7923 OwnedDecl = false; 7924 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7925 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 7926 7927 // FIXME: Check explicit specializations more carefully. 7928 bool isExplicitSpecialization = false; 7929 bool Invalid = false; 7930 7931 // We only need to do this matching if we have template parameters 7932 // or a scope specifier, which also conveniently avoids this work 7933 // for non-C++ cases. 7934 if (TemplateParameterLists.size() > 0 || 7935 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7936 if (TemplateParameterList *TemplateParams 7937 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7938 TemplateParameterLists.get(), 7939 TemplateParameterLists.size(), 7940 TUK == TUK_Friend, 7941 isExplicitSpecialization, 7942 Invalid)) { 7943 if (TemplateParams->size() > 0) { 7944 // This is a declaration or definition of a class template (which may 7945 // be a member of another template). 7946 7947 if (Invalid) 7948 return 0; 7949 7950 OwnedDecl = false; 7951 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7952 SS, Name, NameLoc, Attr, 7953 TemplateParams, AS, 7954 ModulePrivateLoc, 7955 TemplateParameterLists.size() - 1, 7956 (TemplateParameterList**) TemplateParameterLists.release()); 7957 return Result.get(); 7958 } else { 7959 // The "template<>" header is extraneous. 7960 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7961 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7962 isExplicitSpecialization = true; 7963 } 7964 } 7965 } 7966 7967 // Figure out the underlying type if this a enum declaration. We need to do 7968 // this early, because it's needed to detect if this is an incompatible 7969 // redeclaration. 7970 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7971 7972 if (Kind == TTK_Enum) { 7973 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7974 // No underlying type explicitly specified, or we failed to parse the 7975 // type, default to int. 7976 EnumUnderlying = Context.IntTy.getTypePtr(); 7977 else if (UnderlyingType.get()) { 7978 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7979 // integral type; any cv-qualification is ignored. 7980 TypeSourceInfo *TI = 0; 7981 GetTypeFromParser(UnderlyingType.get(), &TI); 7982 EnumUnderlying = TI; 7983 7984 if (CheckEnumUnderlyingType(TI)) 7985 // Recover by falling back to int. 7986 EnumUnderlying = Context.IntTy.getTypePtr(); 7987 7988 if (DiagnoseUnexpandedParameterPack(TI->getTypeLoc().getBeginLoc(), TI, 7989 UPPC_FixedUnderlyingType)) 7990 EnumUnderlying = Context.IntTy.getTypePtr(); 7991 7992 } else if (getLangOpts().MicrosoftMode) 7993 // Microsoft enums are always of int type. 7994 EnumUnderlying = Context.IntTy.getTypePtr(); 7995 } 7996 7997 DeclContext *SearchDC = CurContext; 7998 DeclContext *DC = CurContext; 7999 bool isStdBadAlloc = false; 8000 8001 RedeclarationKind Redecl = ForRedeclaration; 8002 if (TUK == TUK_Friend || TUK == TUK_Reference) 8003 Redecl = NotForRedeclaration; 8004 8005 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 8006 8007 if (Name && SS.isNotEmpty()) { 8008 // We have a nested-name tag ('struct foo::bar'). 8009 8010 // Check for invalid 'foo::'. 8011 if (SS.isInvalid()) { 8012 Name = 0; 8013 goto CreateNewDecl; 8014 } 8015 8016 // If this is a friend or a reference to a class in a dependent 8017 // context, don't try to make a decl for it. 8018 if (TUK == TUK_Friend || TUK == TUK_Reference) { 8019 DC = computeDeclContext(SS, false); 8020 if (!DC) { 8021 IsDependent = true; 8022 return 0; 8023 } 8024 } else { 8025 DC = computeDeclContext(SS, true); 8026 if (!DC) { 8027 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 8028 << SS.getRange(); 8029 return 0; 8030 } 8031 8032 if (isa<CXXRecordDecl>(CurContext)) 8033 diagnoseQualifiedDeclInClass(SS, DC, Name, NameLoc); 8034 } 8035 8036 if (RequireCompleteDeclContext(SS, DC)) 8037 return 0; 8038 8039 SearchDC = DC; 8040 // Look-up name inside 'foo::'. 8041 LookupQualifiedName(Previous, DC); 8042 8043 if (Previous.isAmbiguous()) 8044 return 0; 8045 8046 if (Previous.empty()) { 8047 // Name lookup did not find anything. However, if the 8048 // nested-name-specifier refers to the current instantiation, 8049 // and that current instantiation has any dependent base 8050 // classes, we might find something at instantiation time: treat 8051 // this as a dependent elaborated-type-specifier. 8052 // But this only makes any sense for reference-like lookups. 8053 if (Previous.wasNotFoundInCurrentInstantiation() && 8054 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8055 IsDependent = true; 8056 return 0; 8057 } 8058 8059 // A tag 'foo::bar' must already exist. 8060 Diag(NameLoc, diag::err_not_tag_in_scope) 8061 << Kind << Name << DC << SS.getRange(); 8062 Name = 0; 8063 Invalid = true; 8064 goto CreateNewDecl; 8065 } 8066 } else if (Name) { 8067 // If this is a named struct, check to see if there was a previous forward 8068 // declaration or definition. 8069 // FIXME: We're looking into outer scopes here, even when we 8070 // shouldn't be. Doing so can result in ambiguities that we 8071 // shouldn't be diagnosing. 8072 LookupName(Previous, S); 8073 8074 if (Previous.isAmbiguous() && 8075 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 8076 LookupResult::Filter F = Previous.makeFilter(); 8077 while (F.hasNext()) { 8078 NamedDecl *ND = F.next(); 8079 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 8080 F.erase(); 8081 } 8082 F.done(); 8083 } 8084 8085 // Note: there used to be some attempt at recovery here. 8086 if (Previous.isAmbiguous()) 8087 return 0; 8088 8089 if (!getLangOpts().CPlusPlus && TUK != TUK_Reference) { 8090 // FIXME: This makes sure that we ignore the contexts associated 8091 // with C structs, unions, and enums when looking for a matching 8092 // tag declaration or definition. See the similar lookup tweak 8093 // in Sema::LookupName; is there a better way to deal with this? 8094 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 8095 SearchDC = SearchDC->getParent(); 8096 } 8097 } else if (S->isFunctionPrototypeScope()) { 8098 // If this is an enum declaration in function prototype scope, set its 8099 // initial context to the translation unit. 8100 // FIXME: [citation needed] 8101 SearchDC = Context.getTranslationUnitDecl(); 8102 } 8103 8104 if (Previous.isSingleResult() && 8105 Previous.getFoundDecl()->isTemplateParameter()) { 8106 // Maybe we will complain about the shadowed template parameter. 8107 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 8108 // Just pretend that we didn't see the previous declaration. 8109 Previous.clear(); 8110 } 8111 8112 if (getLangOpts().CPlusPlus && Name && DC && StdNamespace && 8113 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 8114 // This is a declaration of or a reference to "std::bad_alloc". 8115 isStdBadAlloc = true; 8116 8117 if (Previous.empty() && StdBadAlloc) { 8118 // std::bad_alloc has been implicitly declared (but made invisible to 8119 // name lookup). Fill in this implicit declaration as the previous 8120 // declaration, so that the declarations get chained appropriately. 8121 Previous.addDecl(getStdBadAlloc()); 8122 } 8123 } 8124 8125 // If we didn't find a previous declaration, and this is a reference 8126 // (or friend reference), move to the correct scope. In C++, we 8127 // also need to do a redeclaration lookup there, just in case 8128 // there's a shadow friend decl. 8129 if (Name && Previous.empty() && 8130 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8131 if (Invalid) goto CreateNewDecl; 8132 assert(SS.isEmpty()); 8133 8134 if (TUK == TUK_Reference) { 8135 // C++ [basic.scope.pdecl]p5: 8136 // -- for an elaborated-type-specifier of the form 8137 // 8138 // class-key identifier 8139 // 8140 // if the elaborated-type-specifier is used in the 8141 // decl-specifier-seq or parameter-declaration-clause of a 8142 // function defined in namespace scope, the identifier is 8143 // declared as a class-name in the namespace that contains 8144 // the declaration; otherwise, except as a friend 8145 // declaration, the identifier is declared in the smallest 8146 // non-class, non-function-prototype scope that contains the 8147 // declaration. 8148 // 8149 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 8150 // C structs and unions. 8151 // 8152 // It is an error in C++ to declare (rather than define) an enum 8153 // type, including via an elaborated type specifier. We'll 8154 // diagnose that later; for now, declare the enum in the same 8155 // scope as we would have picked for any other tag type. 8156 // 8157 // GNU C also supports this behavior as part of its incomplete 8158 // enum types extension, while GNU C++ does not. 8159 // 8160 // Find the context where we'll be declaring the tag. 8161 // FIXME: We would like to maintain the current DeclContext as the 8162 // lexical context, 8163 while (!SearchDC->isFileContext() && !SearchDC->isFunctionOrMethod()) 8164 SearchDC = SearchDC->getParent(); 8165 8166 // Find the scope where we'll be declaring the tag. 8167 while (S->isClassScope() || 8168 (getLangOpts().CPlusPlus && 8169 S->isFunctionPrototypeScope()) || 8170 ((S->getFlags() & Scope::DeclScope) == 0) || 8171 (S->getEntity() && 8172 ((DeclContext *)S->getEntity())->isTransparentContext())) 8173 S = S->getParent(); 8174 } else { 8175 assert(TUK == TUK_Friend); 8176 // C++ [namespace.memdef]p3: 8177 // If a friend declaration in a non-local class first declares a 8178 // class or function, the friend class or function is a member of 8179 // the innermost enclosing namespace. 8180 SearchDC = SearchDC->getEnclosingNamespaceContext(); 8181 } 8182 8183 // In C++, we need to do a redeclaration lookup to properly 8184 // diagnose some problems. 8185 if (getLangOpts().CPlusPlus) { 8186 Previous.setRedeclarationKind(ForRedeclaration); 8187 LookupQualifiedName(Previous, SearchDC); 8188 } 8189 } 8190 8191 if (!Previous.empty()) { 8192 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 8193 8194 // It's okay to have a tag decl in the same scope as a typedef 8195 // which hides a tag decl in the same scope. Finding this 8196 // insanity with a redeclaration lookup can only actually happen 8197 // in C++. 8198 // 8199 // This is also okay for elaborated-type-specifiers, which is 8200 // technically forbidden by the current standard but which is 8201 // okay according to the likely resolution of an open issue; 8202 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 8203 if (getLangOpts().CPlusPlus) { 8204 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8205 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 8206 TagDecl *Tag = TT->getDecl(); 8207 if (Tag->getDeclName() == Name && 8208 Tag->getDeclContext()->getRedeclContext() 8209 ->Equals(TD->getDeclContext()->getRedeclContext())) { 8210 PrevDecl = Tag; 8211 Previous.clear(); 8212 Previous.addDecl(Tag); 8213 Previous.resolveKind(); 8214 } 8215 } 8216 } 8217 } 8218 8219 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 8220 // If this is a use of a previous tag, or if the tag is already declared 8221 // in the same scope (so that the definition/declaration completes or 8222 // rementions the tag), reuse the decl. 8223 if (TUK == TUK_Reference || TUK == TUK_Friend || 8224 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 8225 // Make sure that this wasn't declared as an enum and now used as a 8226 // struct or something similar. 8227 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 8228 TUK == TUK_Definition, KWLoc, 8229 *Name)) { 8230 bool SafeToContinue 8231 = (PrevTagDecl->getTagKind() != TTK_Enum && 8232 Kind != TTK_Enum); 8233 if (SafeToContinue) 8234 Diag(KWLoc, diag::err_use_with_wrong_tag) 8235 << Name 8236 << FixItHint::CreateReplacement(SourceRange(KWLoc), 8237 PrevTagDecl->getKindName()); 8238 else 8239 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 8240 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8241 8242 if (SafeToContinue) 8243 Kind = PrevTagDecl->getTagKind(); 8244 else { 8245 // Recover by making this an anonymous redefinition. 8246 Name = 0; 8247 Previous.clear(); 8248 Invalid = true; 8249 } 8250 } 8251 8252 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 8253 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 8254 8255 // If this is an elaborated-type-specifier for a scoped enumeration, 8256 // the 'class' keyword is not necessary and not permitted. 8257 if (TUK == TUK_Reference || TUK == TUK_Friend) { 8258 if (ScopedEnum) 8259 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 8260 << PrevEnum->isScoped() 8261 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 8262 return PrevTagDecl; 8263 } 8264 8265 QualType EnumUnderlyingTy; 8266 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8267 EnumUnderlyingTy = TI->getType(); 8268 else if (const Type *T = EnumUnderlying.dyn_cast<const Type*>()) 8269 EnumUnderlyingTy = QualType(T, 0); 8270 8271 // All conflicts with previous declarations are recovered by 8272 // returning the previous declaration, unless this is a definition, 8273 // in which case we want the caller to bail out. 8274 if (CheckEnumRedeclaration(NameLoc.isValid() ? NameLoc : KWLoc, 8275 ScopedEnum, EnumUnderlyingTy, PrevEnum)) 8276 return TUK == TUK_Declaration ? PrevTagDecl : 0; 8277 } 8278 8279 if (!Invalid) { 8280 // If this is a use, just return the declaration we found. 8281 8282 // FIXME: In the future, return a variant or some other clue 8283 // for the consumer of this Decl to know it doesn't own it. 8284 // For our current ASTs this shouldn't be a problem, but will 8285 // need to be changed with DeclGroups. 8286 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 8287 getLangOpts().MicrosoftExt)) || TUK == TUK_Friend) 8288 return PrevTagDecl; 8289 8290 // Diagnose attempts to redefine a tag. 8291 if (TUK == TUK_Definition) { 8292 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 8293 // If we're defining a specialization and the previous definition 8294 // is from an implicit instantiation, don't emit an error 8295 // here; we'll catch this in the general case below. 8296 bool IsExplicitSpecializationAfterInstantiation = false; 8297 if (isExplicitSpecialization) { 8298 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Def)) 8299 IsExplicitSpecializationAfterInstantiation = 8300 RD->getTemplateSpecializationKind() != 8301 TSK_ExplicitSpecialization; 8302 else if (EnumDecl *ED = dyn_cast<EnumDecl>(Def)) 8303 IsExplicitSpecializationAfterInstantiation = 8304 ED->getTemplateSpecializationKind() != 8305 TSK_ExplicitSpecialization; 8306 } 8307 8308 if (!IsExplicitSpecializationAfterInstantiation) { 8309 // A redeclaration in function prototype scope in C isn't 8310 // visible elsewhere, so merely issue a warning. 8311 if (!getLangOpts().CPlusPlus && S->containedInPrototypeScope()) 8312 Diag(NameLoc, diag::warn_redefinition_in_param_list) << Name; 8313 else 8314 Diag(NameLoc, diag::err_redefinition) << Name; 8315 Diag(Def->getLocation(), diag::note_previous_definition); 8316 // If this is a redefinition, recover by making this 8317 // struct be anonymous, which will make any later 8318 // references get the previous definition. 8319 Name = 0; 8320 Previous.clear(); 8321 Invalid = true; 8322 } 8323 } else { 8324 // If the type is currently being defined, complain 8325 // about a nested redefinition. 8326 const TagType *Tag 8327 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8328 if (Tag->isBeingDefined()) { 8329 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8330 Diag(PrevTagDecl->getLocation(), 8331 diag::note_previous_definition); 8332 Name = 0; 8333 Previous.clear(); 8334 Invalid = true; 8335 } 8336 } 8337 8338 // Okay, this is definition of a previously declared or referenced 8339 // tag PrevDecl. We're going to create a new Decl for it. 8340 } 8341 } 8342 // If we get here we have (another) forward declaration or we 8343 // have a definition. Just create a new decl. 8344 8345 } else { 8346 // If we get here, this is a definition of a new tag type in a nested 8347 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8348 // new decl/type. We set PrevDecl to NULL so that the entities 8349 // have distinct types. 8350 Previous.clear(); 8351 } 8352 // If we get here, we're going to create a new Decl. If PrevDecl 8353 // is non-NULL, it's a definition of the tag declared by 8354 // PrevDecl. If it's NULL, we have a new definition. 8355 8356 8357 // Otherwise, PrevDecl is not a tag, but was found with tag 8358 // lookup. This is only actually possible in C++, where a few 8359 // things like templates still live in the tag namespace. 8360 } else { 8361 // Use a better diagnostic if an elaborated-type-specifier 8362 // found the wrong kind of type on the first 8363 // (non-redeclaration) lookup. 8364 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8365 !Previous.isForRedeclaration()) { 8366 unsigned Kind = 0; 8367 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8368 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8369 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8370 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8371 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8372 Invalid = true; 8373 8374 // Otherwise, only diagnose if the declaration is in scope. 8375 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8376 isExplicitSpecialization)) { 8377 // do nothing 8378 8379 // Diagnose implicit declarations introduced by elaborated types. 8380 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8381 unsigned Kind = 0; 8382 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8383 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8384 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8385 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8386 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8387 Invalid = true; 8388 8389 // Otherwise it's a declaration. Call out a particularly common 8390 // case here. 8391 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8392 unsigned Kind = 0; 8393 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8394 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8395 << Name << Kind << TND->getUnderlyingType(); 8396 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8397 Invalid = true; 8398 8399 // Otherwise, diagnose. 8400 } else { 8401 // The tag name clashes with something else in the target scope, 8402 // issue an error and recover by making this tag be anonymous. 8403 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8404 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8405 Name = 0; 8406 Invalid = true; 8407 } 8408 8409 // The existing declaration isn't relevant to us; we're in a 8410 // new scope, so clear out the previous declaration. 8411 Previous.clear(); 8412 } 8413 } 8414 8415CreateNewDecl: 8416 8417 TagDecl *PrevDecl = 0; 8418 if (Previous.isSingleResult()) 8419 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8420 8421 // If there is an identifier, use the location of the identifier as the 8422 // location of the decl, otherwise use the location of the struct/union 8423 // keyword. 8424 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8425 8426 // Otherwise, create a new declaration. If there is a previous 8427 // declaration of the same entity, the two will be linked via 8428 // PrevDecl. 8429 TagDecl *New; 8430 8431 bool IsForwardReference = false; 8432 if (Kind == TTK_Enum) { 8433 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8434 // enum X { A, B, C } D; D should chain to X. 8435 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8436 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8437 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8438 // If this is an undefined enum, warn. 8439 if (TUK != TUK_Definition && !Invalid) { 8440 TagDecl *Def; 8441 if (getLangOpts().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8442 // C++0x: 7.2p2: opaque-enum-declaration. 8443 // Conflicts are diagnosed above. Do nothing. 8444 } 8445 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8446 Diag(Loc, diag::ext_forward_ref_enum_def) 8447 << New; 8448 Diag(Def->getLocation(), diag::note_previous_definition); 8449 } else { 8450 unsigned DiagID = diag::ext_forward_ref_enum; 8451 if (getLangOpts().MicrosoftMode) 8452 DiagID = diag::ext_ms_forward_ref_enum; 8453 else if (getLangOpts().CPlusPlus) 8454 DiagID = diag::err_forward_ref_enum; 8455 Diag(Loc, DiagID); 8456 8457 // If this is a forward-declared reference to an enumeration, make a 8458 // note of it; we won't actually be introducing the declaration into 8459 // the declaration context. 8460 if (TUK == TUK_Reference) 8461 IsForwardReference = true; 8462 } 8463 } 8464 8465 if (EnumUnderlying) { 8466 EnumDecl *ED = cast<EnumDecl>(New); 8467 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8468 ED->setIntegerTypeSourceInfo(TI); 8469 else 8470 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8471 ED->setPromotionType(ED->getIntegerType()); 8472 } 8473 8474 } else { 8475 // struct/union/class 8476 8477 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8478 // struct X { int A; } D; D should chain to X. 8479 if (getLangOpts().CPlusPlus) { 8480 // FIXME: Look for a way to use RecordDecl for simple structs. 8481 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8482 cast_or_null<CXXRecordDecl>(PrevDecl)); 8483 8484 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8485 StdBadAlloc = cast<CXXRecordDecl>(New); 8486 } else 8487 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8488 cast_or_null<RecordDecl>(PrevDecl)); 8489 } 8490 8491 // Maybe add qualifier info. 8492 if (SS.isNotEmpty()) { 8493 if (SS.isSet()) { 8494 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8495 if (TemplateParameterLists.size() > 0) { 8496 New->setTemplateParameterListsInfo(Context, 8497 TemplateParameterLists.size(), 8498 (TemplateParameterList**) TemplateParameterLists.release()); 8499 } 8500 } 8501 else 8502 Invalid = true; 8503 } 8504 8505 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8506 // Add alignment attributes if necessary; these attributes are checked when 8507 // the ASTContext lays out the structure. 8508 // 8509 // It is important for implementing the correct semantics that this 8510 // happen here (in act on tag decl). The #pragma pack stack is 8511 // maintained as a result of parser callbacks which can occur at 8512 // many points during the parsing of a struct declaration (because 8513 // the #pragma tokens are effectively skipped over during the 8514 // parsing of the struct). 8515 AddAlignmentAttributesForRecord(RD); 8516 8517 AddMsStructLayoutForRecord(RD); 8518 } 8519 8520 if (ModulePrivateLoc.isValid()) { 8521 if (isExplicitSpecialization) 8522 Diag(New->getLocation(), diag::err_module_private_specialization) 8523 << 2 8524 << FixItHint::CreateRemoval(ModulePrivateLoc); 8525 // __module_private__ does not apply to local classes. However, we only 8526 // diagnose this as an error when the declaration specifiers are 8527 // freestanding. Here, we just ignore the __module_private__. 8528 else if (!SearchDC->isFunctionOrMethod()) 8529 New->setModulePrivate(); 8530 } 8531 8532 // If this is a specialization of a member class (of a class template), 8533 // check the specialization. 8534 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8535 Invalid = true; 8536 8537 if (Invalid) 8538 New->setInvalidDecl(); 8539 8540 if (Attr) 8541 ProcessDeclAttributeList(S, New, Attr); 8542 8543 // If we're declaring or defining a tag in function prototype scope 8544 // in C, note that this type can only be used within the function. 8545 if (Name && S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus) 8546 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8547 8548 // Set the lexical context. If the tag has a C++ scope specifier, the 8549 // lexical context will be different from the semantic context. 8550 New->setLexicalDeclContext(CurContext); 8551 8552 // Mark this as a friend decl if applicable. 8553 // In Microsoft mode, a friend declaration also acts as a forward 8554 // declaration so we always pass true to setObjectOfFriendDecl to make 8555 // the tag name visible. 8556 if (TUK == TUK_Friend) 8557 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8558 getLangOpts().MicrosoftExt); 8559 8560 // Set the access specifier. 8561 if (!Invalid && SearchDC->isRecord()) 8562 SetMemberAccessSpecifier(New, PrevDecl, AS); 8563 8564 if (TUK == TUK_Definition) 8565 New->startDefinition(); 8566 8567 // If this has an identifier, add it to the scope stack. 8568 if (TUK == TUK_Friend) { 8569 // We might be replacing an existing declaration in the lookup tables; 8570 // if so, borrow its access specifier. 8571 if (PrevDecl) 8572 New->setAccess(PrevDecl->getAccess()); 8573 8574 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8575 DC->makeDeclVisibleInContext(New); 8576 if (Name) // can be null along some error paths 8577 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8578 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8579 } else if (Name) { 8580 S = getNonFieldDeclScope(S); 8581 PushOnScopeChains(New, S, !IsForwardReference); 8582 if (IsForwardReference) 8583 SearchDC->makeDeclVisibleInContext(New); 8584 8585 } else { 8586 CurContext->addDecl(New); 8587 } 8588 8589 // If this is the C FILE type, notify the AST context. 8590 if (IdentifierInfo *II = New->getIdentifier()) 8591 if (!New->isInvalidDecl() && 8592 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8593 II->isStr("FILE")) 8594 Context.setFILEDecl(New); 8595 8596 // If we were in function prototype scope (and not in C++ mode), add this 8597 // tag to the list of decls to inject into the function definition scope. 8598 if (S->isFunctionPrototypeScope() && !getLangOpts().CPlusPlus && 8599 InFunctionDeclarator && Name) 8600 DeclsInPrototypeScope.push_back(New); 8601 8602 OwnedDecl = true; 8603 return New; 8604} 8605 8606void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8607 AdjustDeclIfTemplate(TagD); 8608 TagDecl *Tag = cast<TagDecl>(TagD); 8609 8610 // Enter the tag context. 8611 PushDeclContext(S, Tag); 8612} 8613 8614Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8615 assert(isa<ObjCContainerDecl>(IDecl) && 8616 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8617 DeclContext *OCD = cast<DeclContext>(IDecl); 8618 assert(getContainingDC(OCD) == CurContext && 8619 "The next DeclContext should be lexically contained in the current one."); 8620 CurContext = OCD; 8621 return IDecl; 8622} 8623 8624void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8625 SourceLocation FinalLoc, 8626 SourceLocation LBraceLoc) { 8627 AdjustDeclIfTemplate(TagD); 8628 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8629 8630 FieldCollector->StartClass(); 8631 8632 if (!Record->getIdentifier()) 8633 return; 8634 8635 if (FinalLoc.isValid()) 8636 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8637 8638 // C++ [class]p2: 8639 // [...] The class-name is also inserted into the scope of the 8640 // class itself; this is known as the injected-class-name. For 8641 // purposes of access checking, the injected-class-name is treated 8642 // as if it were a public member name. 8643 CXXRecordDecl *InjectedClassName 8644 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8645 Record->getLocStart(), Record->getLocation(), 8646 Record->getIdentifier(), 8647 /*PrevDecl=*/0, 8648 /*DelayTypeCreation=*/true); 8649 Context.getTypeDeclType(InjectedClassName, Record); 8650 InjectedClassName->setImplicit(); 8651 InjectedClassName->setAccess(AS_public); 8652 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8653 InjectedClassName->setDescribedClassTemplate(Template); 8654 PushOnScopeChains(InjectedClassName, S); 8655 assert(InjectedClassName->isInjectedClassName() && 8656 "Broken injected-class-name"); 8657} 8658 8659void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8660 SourceLocation RBraceLoc) { 8661 AdjustDeclIfTemplate(TagD); 8662 TagDecl *Tag = cast<TagDecl>(TagD); 8663 Tag->setRBraceLoc(RBraceLoc); 8664 8665 // Make sure we "complete" the definition even it is invalid. 8666 if (Tag->isBeingDefined()) { 8667 assert(Tag->isInvalidDecl() && "We should already have completed it"); 8668 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 8669 RD->completeDefinition(); 8670 } 8671 8672 if (isa<CXXRecordDecl>(Tag)) 8673 FieldCollector->FinishClass(); 8674 8675 // Exit this scope of this tag's definition. 8676 PopDeclContext(); 8677 8678 // Notify the consumer that we've defined a tag. 8679 Consumer.HandleTagDeclDefinition(Tag); 8680} 8681 8682void Sema::ActOnObjCContainerFinishDefinition() { 8683 // Exit this scope of this interface definition. 8684 PopDeclContext(); 8685} 8686 8687void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8688 assert(DC == CurContext && "Mismatch of container contexts"); 8689 OriginalLexicalContext = DC; 8690 ActOnObjCContainerFinishDefinition(); 8691} 8692 8693void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8694 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8695 OriginalLexicalContext = 0; 8696} 8697 8698void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8699 AdjustDeclIfTemplate(TagD); 8700 TagDecl *Tag = cast<TagDecl>(TagD); 8701 Tag->setInvalidDecl(); 8702 8703 // Make sure we "complete" the definition even it is invalid. 8704 if (Tag->isBeingDefined()) { 8705 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) 8706 RD->completeDefinition(); 8707 } 8708 8709 // We're undoing ActOnTagStartDefinition here, not 8710 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8711 // the FieldCollector. 8712 8713 PopDeclContext(); 8714} 8715 8716// Note that FieldName may be null for anonymous bitfields. 8717ExprResult Sema::VerifyBitField(SourceLocation FieldLoc, 8718 IdentifierInfo *FieldName, 8719 QualType FieldTy, Expr *BitWidth, 8720 bool *ZeroWidth) { 8721 // Default to true; that shouldn't confuse checks for emptiness 8722 if (ZeroWidth) 8723 *ZeroWidth = true; 8724 8725 // C99 6.7.2.1p4 - verify the field type. 8726 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8727 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8728 // Handle incomplete types with specific error. 8729 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8730 return ExprError(); 8731 if (FieldName) 8732 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8733 << FieldName << FieldTy << BitWidth->getSourceRange(); 8734 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8735 << FieldTy << BitWidth->getSourceRange(); 8736 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8737 UPPC_BitFieldWidth)) 8738 return ExprError(); 8739 8740 // If the bit-width is type- or value-dependent, don't try to check 8741 // it now. 8742 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8743 return Owned(BitWidth); 8744 8745 llvm::APSInt Value; 8746 ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value); 8747 if (ICE.isInvalid()) 8748 return ICE; 8749 BitWidth = ICE.take(); 8750 8751 if (Value != 0 && ZeroWidth) 8752 *ZeroWidth = false; 8753 8754 // Zero-width bitfield is ok for anonymous field. 8755 if (Value == 0 && FieldName) 8756 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8757 8758 if (Value.isSigned() && Value.isNegative()) { 8759 if (FieldName) 8760 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8761 << FieldName << Value.toString(10); 8762 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8763 << Value.toString(10); 8764 } 8765 8766 if (!FieldTy->isDependentType()) { 8767 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8768 if (Value.getZExtValue() > TypeSize) { 8769 if (!getLangOpts().CPlusPlus) { 8770 if (FieldName) 8771 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8772 << FieldName << (unsigned)Value.getZExtValue() 8773 << (unsigned)TypeSize; 8774 8775 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8776 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8777 } 8778 8779 if (FieldName) 8780 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8781 << FieldName << (unsigned)Value.getZExtValue() 8782 << (unsigned)TypeSize; 8783 else 8784 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8785 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8786 } 8787 } 8788 8789 return Owned(BitWidth); 8790} 8791 8792/// ActOnField - Each field of a C struct/union is passed into this in order 8793/// to create a FieldDecl object for it. 8794Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8795 Declarator &D, Expr *BitfieldWidth) { 8796 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8797 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8798 /*HasInit=*/false, AS_public); 8799 return Res; 8800} 8801 8802/// HandleField - Analyze a field of a C struct or a C++ data member. 8803/// 8804FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8805 SourceLocation DeclStart, 8806 Declarator &D, Expr *BitWidth, bool HasInit, 8807 AccessSpecifier AS) { 8808 IdentifierInfo *II = D.getIdentifier(); 8809 SourceLocation Loc = DeclStart; 8810 if (II) Loc = D.getIdentifierLoc(); 8811 8812 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8813 QualType T = TInfo->getType(); 8814 if (getLangOpts().CPlusPlus) { 8815 CheckExtraCXXDefaultArguments(D); 8816 8817 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8818 UPPC_DataMemberType)) { 8819 D.setInvalidType(); 8820 T = Context.IntTy; 8821 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8822 } 8823 } 8824 8825 DiagnoseFunctionSpecifiers(D); 8826 8827 if (D.getDeclSpec().isThreadSpecified()) 8828 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8829 if (D.getDeclSpec().isConstexprSpecified()) 8830 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8831 << 2; 8832 8833 // Check to see if this name was declared as a member previously 8834 NamedDecl *PrevDecl = 0; 8835 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8836 LookupName(Previous, S); 8837 switch (Previous.getResultKind()) { 8838 case LookupResult::Found: 8839 case LookupResult::FoundUnresolvedValue: 8840 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8841 break; 8842 8843 case LookupResult::FoundOverloaded: 8844 PrevDecl = Previous.getRepresentativeDecl(); 8845 break; 8846 8847 case LookupResult::NotFound: 8848 case LookupResult::NotFoundInCurrentInstantiation: 8849 case LookupResult::Ambiguous: 8850 break; 8851 } 8852 Previous.suppressDiagnostics(); 8853 8854 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8855 // Maybe we will complain about the shadowed template parameter. 8856 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8857 // Just pretend that we didn't see the previous declaration. 8858 PrevDecl = 0; 8859 } 8860 8861 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8862 PrevDecl = 0; 8863 8864 bool Mutable 8865 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8866 SourceLocation TSSL = D.getLocStart(); 8867 FieldDecl *NewFD 8868 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8869 TSSL, AS, PrevDecl, &D); 8870 8871 if (NewFD->isInvalidDecl()) 8872 Record->setInvalidDecl(); 8873 8874 if (D.getDeclSpec().isModulePrivateSpecified()) 8875 NewFD->setModulePrivate(); 8876 8877 if (NewFD->isInvalidDecl() && PrevDecl) { 8878 // Don't introduce NewFD into scope; there's already something 8879 // with the same name in the same scope. 8880 } else if (II) { 8881 PushOnScopeChains(NewFD, S); 8882 } else 8883 Record->addDecl(NewFD); 8884 8885 return NewFD; 8886} 8887 8888/// \brief Build a new FieldDecl and check its well-formedness. 8889/// 8890/// This routine builds a new FieldDecl given the fields name, type, 8891/// record, etc. \p PrevDecl should refer to any previous declaration 8892/// with the same name and in the same scope as the field to be 8893/// created. 8894/// 8895/// \returns a new FieldDecl. 8896/// 8897/// \todo The Declarator argument is a hack. It will be removed once 8898FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8899 TypeSourceInfo *TInfo, 8900 RecordDecl *Record, SourceLocation Loc, 8901 bool Mutable, Expr *BitWidth, bool HasInit, 8902 SourceLocation TSSL, 8903 AccessSpecifier AS, NamedDecl *PrevDecl, 8904 Declarator *D) { 8905 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8906 bool InvalidDecl = false; 8907 if (D) InvalidDecl = D->isInvalidType(); 8908 8909 // If we receive a broken type, recover by assuming 'int' and 8910 // marking this declaration as invalid. 8911 if (T.isNull()) { 8912 InvalidDecl = true; 8913 T = Context.IntTy; 8914 } 8915 8916 QualType EltTy = Context.getBaseElementType(T); 8917 if (!EltTy->isDependentType()) { 8918 if (RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8919 // Fields of incomplete type force their record to be invalid. 8920 Record->setInvalidDecl(); 8921 InvalidDecl = true; 8922 } else { 8923 NamedDecl *Def; 8924 EltTy->isIncompleteType(&Def); 8925 if (Def && Def->isInvalidDecl()) { 8926 Record->setInvalidDecl(); 8927 InvalidDecl = true; 8928 } 8929 } 8930 } 8931 8932 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8933 // than a variably modified type. 8934 if (!InvalidDecl && T->isVariablyModifiedType()) { 8935 bool SizeIsNegative; 8936 llvm::APSInt Oversized; 8937 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8938 SizeIsNegative, 8939 Oversized); 8940 if (!FixedTy.isNull()) { 8941 Diag(Loc, diag::warn_illegal_constant_array_size); 8942 T = FixedTy; 8943 } else { 8944 if (SizeIsNegative) 8945 Diag(Loc, diag::err_typecheck_negative_array_size); 8946 else if (Oversized.getBoolValue()) 8947 Diag(Loc, diag::err_array_too_large) 8948 << Oversized.toString(10); 8949 else 8950 Diag(Loc, diag::err_typecheck_field_variable_size); 8951 InvalidDecl = true; 8952 } 8953 } 8954 8955 // Fields can not have abstract class types 8956 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8957 diag::err_abstract_type_in_decl, 8958 AbstractFieldType)) 8959 InvalidDecl = true; 8960 8961 bool ZeroWidth = false; 8962 // If this is declared as a bit-field, check the bit-field. 8963 if (!InvalidDecl && BitWidth) { 8964 BitWidth = VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth).take(); 8965 if (!BitWidth) { 8966 InvalidDecl = true; 8967 BitWidth = 0; 8968 ZeroWidth = false; 8969 } 8970 } 8971 8972 // Check that 'mutable' is consistent with the type of the declaration. 8973 if (!InvalidDecl && Mutable) { 8974 unsigned DiagID = 0; 8975 if (T->isReferenceType()) 8976 DiagID = diag::err_mutable_reference; 8977 else if (T.isConstQualified()) 8978 DiagID = diag::err_mutable_const; 8979 8980 if (DiagID) { 8981 SourceLocation ErrLoc = Loc; 8982 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8983 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8984 Diag(ErrLoc, DiagID); 8985 Mutable = false; 8986 InvalidDecl = true; 8987 } 8988 } 8989 8990 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8991 BitWidth, Mutable, HasInit); 8992 if (InvalidDecl) 8993 NewFD->setInvalidDecl(); 8994 8995 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8996 Diag(Loc, diag::err_duplicate_member) << II; 8997 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8998 NewFD->setInvalidDecl(); 8999 } 9000 9001 if (!InvalidDecl && getLangOpts().CPlusPlus) { 9002 if (Record->isUnion()) { 9003 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 9004 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 9005 if (RDecl->getDefinition()) { 9006 // C++ [class.union]p1: An object of a class with a non-trivial 9007 // constructor, a non-trivial copy constructor, a non-trivial 9008 // destructor, or a non-trivial copy assignment operator 9009 // cannot be a member of a union, nor can an array of such 9010 // objects. 9011 if (CheckNontrivialField(NewFD)) 9012 NewFD->setInvalidDecl(); 9013 } 9014 } 9015 9016 // C++ [class.union]p1: If a union contains a member of reference type, 9017 // the program is ill-formed. 9018 if (EltTy->isReferenceType()) { 9019 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 9020 << NewFD->getDeclName() << EltTy; 9021 NewFD->setInvalidDecl(); 9022 } 9023 } 9024 } 9025 9026 // FIXME: We need to pass in the attributes given an AST 9027 // representation, not a parser representation. 9028 if (D) 9029 // FIXME: What to pass instead of TUScope? 9030 ProcessDeclAttributes(TUScope, NewFD, *D); 9031 9032 // In auto-retain/release, infer strong retension for fields of 9033 // retainable type. 9034 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 9035 NewFD->setInvalidDecl(); 9036 9037 if (T.isObjCGCWeak()) 9038 Diag(Loc, diag::warn_attribute_weak_on_field); 9039 9040 NewFD->setAccess(AS); 9041 return NewFD; 9042} 9043 9044bool Sema::CheckNontrivialField(FieldDecl *FD) { 9045 assert(FD); 9046 assert(getLangOpts().CPlusPlus && "valid check only for C++"); 9047 9048 if (FD->isInvalidDecl()) 9049 return true; 9050 9051 QualType EltTy = Context.getBaseElementType(FD->getType()); 9052 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 9053 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 9054 if (RDecl->getDefinition()) { 9055 // We check for copy constructors before constructors 9056 // because otherwise we'll never get complaints about 9057 // copy constructors. 9058 9059 CXXSpecialMember member = CXXInvalid; 9060 if (!RDecl->hasTrivialCopyConstructor()) 9061 member = CXXCopyConstructor; 9062 else if (!RDecl->hasTrivialDefaultConstructor()) 9063 member = CXXDefaultConstructor; 9064 else if (!RDecl->hasTrivialCopyAssignment()) 9065 member = CXXCopyAssignment; 9066 else if (!RDecl->hasTrivialDestructor()) 9067 member = CXXDestructor; 9068 9069 if (member != CXXInvalid) { 9070 if (!getLangOpts().CPlusPlus0x && 9071 getLangOpts().ObjCAutoRefCount && RDecl->hasObjectMember()) { 9072 // Objective-C++ ARC: it is an error to have a non-trivial field of 9073 // a union. However, system headers in Objective-C programs 9074 // occasionally have Objective-C lifetime objects within unions, 9075 // and rather than cause the program to fail, we make those 9076 // members unavailable. 9077 SourceLocation Loc = FD->getLocation(); 9078 if (getSourceManager().isInSystemHeader(Loc)) { 9079 if (!FD->hasAttr<UnavailableAttr>()) 9080 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 9081 "this system field has retaining ownership")); 9082 return false; 9083 } 9084 } 9085 9086 Diag(FD->getLocation(), getLangOpts().CPlusPlus0x ? 9087 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 9088 diag::err_illegal_union_or_anon_struct_member) 9089 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 9090 DiagnoseNontrivial(RT, member); 9091 return !getLangOpts().CPlusPlus0x; 9092 } 9093 } 9094 } 9095 9096 return false; 9097} 9098 9099/// If the given constructor is user-provided, produce a diagnostic explaining 9100/// that it makes the class non-trivial. 9101static bool DiagnoseNontrivialUserProvidedCtor(Sema &S, QualType QT, 9102 CXXConstructorDecl *CD, 9103 Sema::CXXSpecialMember CSM) { 9104 if (!CD->isUserProvided()) 9105 return false; 9106 9107 SourceLocation CtorLoc = CD->getLocation(); 9108 S.Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << CSM; 9109 return true; 9110} 9111 9112/// DiagnoseNontrivial - Given that a class has a non-trivial 9113/// special member, figure out why. 9114void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 9115 QualType QT(T, 0U); 9116 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 9117 9118 // Check whether the member was user-declared. 9119 switch (member) { 9120 case CXXInvalid: 9121 break; 9122 9123 case CXXDefaultConstructor: 9124 if (RD->hasUserDeclaredConstructor()) { 9125 typedef CXXRecordDecl::ctor_iterator ctor_iter; 9126 for (ctor_iter CI = RD->ctor_begin(), CE = RD->ctor_end(); CI != CE; ++CI) 9127 if (DiagnoseNontrivialUserProvidedCtor(*this, QT, *CI, member)) 9128 return; 9129 9130 // No user-provided constructors; look for constructor templates. 9131 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 9132 tmpl_iter; 9133 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); 9134 TI != TE; ++TI) { 9135 CXXConstructorDecl *CD = 9136 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl()); 9137 if (CD && DiagnoseNontrivialUserProvidedCtor(*this, QT, CD, member)) 9138 return; 9139 } 9140 } 9141 break; 9142 9143 case CXXCopyConstructor: 9144 if (RD->hasUserDeclaredCopyConstructor()) { 9145 SourceLocation CtorLoc = 9146 RD->getCopyConstructor(0)->getLocation(); 9147 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9148 return; 9149 } 9150 break; 9151 9152 case CXXMoveConstructor: 9153 if (RD->hasUserDeclaredMoveConstructor()) { 9154 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 9155 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9156 return; 9157 } 9158 break; 9159 9160 case CXXCopyAssignment: 9161 if (RD->hasUserDeclaredCopyAssignment()) { 9162 // FIXME: this should use the location of the copy 9163 // assignment, not the type. 9164 SourceLocation TyLoc = RD->getLocStart(); 9165 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 9166 return; 9167 } 9168 break; 9169 9170 case CXXMoveAssignment: 9171 if (RD->hasUserDeclaredMoveAssignment()) { 9172 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 9173 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 9174 return; 9175 } 9176 break; 9177 9178 case CXXDestructor: 9179 if (RD->hasUserDeclaredDestructor()) { 9180 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 9181 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9182 return; 9183 } 9184 break; 9185 } 9186 9187 typedef CXXRecordDecl::base_class_iterator base_iter; 9188 9189 // Virtual bases and members inhibit trivial copying/construction, 9190 // but not trivial destruction. 9191 if (member != CXXDestructor) { 9192 // Check for virtual bases. vbases includes indirect virtual bases, 9193 // so we just iterate through the direct bases. 9194 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 9195 if (bi->isVirtual()) { 9196 SourceLocation BaseLoc = bi->getLocStart(); 9197 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 9198 return; 9199 } 9200 9201 // Check for virtual methods. 9202 typedef CXXRecordDecl::method_iterator meth_iter; 9203 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 9204 ++mi) { 9205 if (mi->isVirtual()) { 9206 SourceLocation MLoc = mi->getLocStart(); 9207 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 9208 return; 9209 } 9210 } 9211 } 9212 9213 bool (CXXRecordDecl::*hasTrivial)() const; 9214 switch (member) { 9215 case CXXDefaultConstructor: 9216 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 9217 case CXXCopyConstructor: 9218 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 9219 case CXXCopyAssignment: 9220 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 9221 case CXXDestructor: 9222 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 9223 default: 9224 llvm_unreachable("unexpected special member"); 9225 } 9226 9227 // Check for nontrivial bases (and recurse). 9228 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 9229 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 9230 assert(BaseRT && "Don't know how to handle dependent bases"); 9231 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 9232 if (!(BaseRecTy->*hasTrivial)()) { 9233 SourceLocation BaseLoc = bi->getLocStart(); 9234 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 9235 DiagnoseNontrivial(BaseRT, member); 9236 return; 9237 } 9238 } 9239 9240 // Check for nontrivial members (and recurse). 9241 typedef RecordDecl::field_iterator field_iter; 9242 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 9243 ++fi) { 9244 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 9245 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 9246 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 9247 9248 if (!(EltRD->*hasTrivial)()) { 9249 SourceLocation FLoc = (*fi)->getLocation(); 9250 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 9251 DiagnoseNontrivial(EltRT, member); 9252 return; 9253 } 9254 } 9255 9256 if (EltTy->isObjCLifetimeType()) { 9257 switch (EltTy.getObjCLifetime()) { 9258 case Qualifiers::OCL_None: 9259 case Qualifiers::OCL_ExplicitNone: 9260 break; 9261 9262 case Qualifiers::OCL_Autoreleasing: 9263 case Qualifiers::OCL_Weak: 9264 case Qualifiers::OCL_Strong: 9265 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 9266 << QT << EltTy.getObjCLifetime(); 9267 return; 9268 } 9269 } 9270 } 9271 9272 llvm_unreachable("found no explanation for non-trivial member"); 9273} 9274 9275/// TranslateIvarVisibility - Translate visibility from a token ID to an 9276/// AST enum value. 9277static ObjCIvarDecl::AccessControl 9278TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 9279 switch (ivarVisibility) { 9280 default: llvm_unreachable("Unknown visitibility kind"); 9281 case tok::objc_private: return ObjCIvarDecl::Private; 9282 case tok::objc_public: return ObjCIvarDecl::Public; 9283 case tok::objc_protected: return ObjCIvarDecl::Protected; 9284 case tok::objc_package: return ObjCIvarDecl::Package; 9285 } 9286} 9287 9288/// ActOnIvar - Each ivar field of an objective-c class is passed into this 9289/// in order to create an IvarDecl object for it. 9290Decl *Sema::ActOnIvar(Scope *S, 9291 SourceLocation DeclStart, 9292 Declarator &D, Expr *BitfieldWidth, 9293 tok::ObjCKeywordKind Visibility) { 9294 9295 IdentifierInfo *II = D.getIdentifier(); 9296 Expr *BitWidth = (Expr*)BitfieldWidth; 9297 SourceLocation Loc = DeclStart; 9298 if (II) Loc = D.getIdentifierLoc(); 9299 9300 // FIXME: Unnamed fields can be handled in various different ways, for 9301 // example, unnamed unions inject all members into the struct namespace! 9302 9303 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9304 QualType T = TInfo->getType(); 9305 9306 if (BitWidth) { 9307 // 6.7.2.1p3, 6.7.2.1p4 9308 BitWidth = VerifyBitField(Loc, II, T, BitWidth).take(); 9309 if (!BitWidth) 9310 D.setInvalidType(); 9311 } else { 9312 // Not a bitfield. 9313 9314 // validate II. 9315 9316 } 9317 if (T->isReferenceType()) { 9318 Diag(Loc, diag::err_ivar_reference_type); 9319 D.setInvalidType(); 9320 } 9321 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9322 // than a variably modified type. 9323 else if (T->isVariablyModifiedType()) { 9324 Diag(Loc, diag::err_typecheck_ivar_variable_size); 9325 D.setInvalidType(); 9326 } 9327 9328 // Get the visibility (access control) for this ivar. 9329 ObjCIvarDecl::AccessControl ac = 9330 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 9331 : ObjCIvarDecl::None; 9332 // Must set ivar's DeclContext to its enclosing interface. 9333 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 9334 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl()) 9335 return 0; 9336 ObjCContainerDecl *EnclosingContext; 9337 if (ObjCImplementationDecl *IMPDecl = 9338 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9339 if (!LangOpts.ObjCNonFragileABI2) { 9340 // Case of ivar declared in an implementation. Context is that of its class. 9341 EnclosingContext = IMPDecl->getClassInterface(); 9342 assert(EnclosingContext && "Implementation has no class interface!"); 9343 } 9344 else 9345 EnclosingContext = EnclosingDecl; 9346 } else { 9347 if (ObjCCategoryDecl *CDecl = 9348 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9349 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 9350 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 9351 return 0; 9352 } 9353 } 9354 EnclosingContext = EnclosingDecl; 9355 } 9356 9357 // Construct the decl. 9358 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 9359 DeclStart, Loc, II, T, 9360 TInfo, ac, (Expr *)BitfieldWidth); 9361 9362 if (II) { 9363 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 9364 ForRedeclaration); 9365 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9366 && !isa<TagDecl>(PrevDecl)) { 9367 Diag(Loc, diag::err_duplicate_member) << II; 9368 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9369 NewID->setInvalidDecl(); 9370 } 9371 } 9372 9373 // Process attributes attached to the ivar. 9374 ProcessDeclAttributes(S, NewID, D); 9375 9376 if (D.isInvalidType()) 9377 NewID->setInvalidDecl(); 9378 9379 // In ARC, infer 'retaining' for ivars of retainable type. 9380 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9381 NewID->setInvalidDecl(); 9382 9383 if (D.getDeclSpec().isModulePrivateSpecified()) 9384 NewID->setModulePrivate(); 9385 9386 if (II) { 9387 // FIXME: When interfaces are DeclContexts, we'll need to add 9388 // these to the interface. 9389 S->AddDecl(NewID); 9390 IdResolver.AddDecl(NewID); 9391 } 9392 9393 return NewID; 9394} 9395 9396/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9397/// class and class extensions. For every class @interface and class 9398/// extension @interface, if the last ivar is a bitfield of any type, 9399/// then add an implicit `char :0` ivar to the end of that interface. 9400void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9401 SmallVectorImpl<Decl *> &AllIvarDecls) { 9402 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9403 return; 9404 9405 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9406 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9407 9408 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9409 return; 9410 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9411 if (!ID) { 9412 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9413 if (!CD->IsClassExtension()) 9414 return; 9415 } 9416 // No need to add this to end of @implementation. 9417 else 9418 return; 9419 } 9420 // All conditions are met. Add a new bitfield to the tail end of ivars. 9421 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9422 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9423 9424 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9425 DeclLoc, DeclLoc, 0, 9426 Context.CharTy, 9427 Context.getTrivialTypeSourceInfo(Context.CharTy, 9428 DeclLoc), 9429 ObjCIvarDecl::Private, BW, 9430 true); 9431 AllIvarDecls.push_back(Ivar); 9432} 9433 9434void Sema::ActOnFields(Scope* S, 9435 SourceLocation RecLoc, Decl *EnclosingDecl, 9436 llvm::ArrayRef<Decl *> Fields, 9437 SourceLocation LBrac, SourceLocation RBrac, 9438 AttributeList *Attr) { 9439 assert(EnclosingDecl && "missing record or interface decl"); 9440 9441 // If the decl this is being inserted into is invalid, then it may be a 9442 // redeclaration or some other bogus case. Don't try to add fields to it. 9443 if (EnclosingDecl->isInvalidDecl()) 9444 return; 9445 9446 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9447 9448 // Start counting up the number of named members; make sure to include 9449 // members of anonymous structs and unions in the total. 9450 unsigned NumNamedMembers = 0; 9451 if (Record) { 9452 for (RecordDecl::decl_iterator i = Record->decls_begin(), 9453 e = Record->decls_end(); i != e; i++) { 9454 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*i)) 9455 if (IFD->getDeclName()) 9456 ++NumNamedMembers; 9457 } 9458 } 9459 9460 // Verify that all the fields are okay. 9461 SmallVector<FieldDecl*, 32> RecFields; 9462 9463 bool ARCErrReported = false; 9464 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9465 i != end; ++i) { 9466 FieldDecl *FD = cast<FieldDecl>(*i); 9467 9468 // Get the type for the field. 9469 const Type *FDTy = FD->getType().getTypePtr(); 9470 9471 if (!FD->isAnonymousStructOrUnion()) { 9472 // Remember all fields written by the user. 9473 RecFields.push_back(FD); 9474 } 9475 9476 // If the field is already invalid for some reason, don't emit more 9477 // diagnostics about it. 9478 if (FD->isInvalidDecl()) { 9479 EnclosingDecl->setInvalidDecl(); 9480 continue; 9481 } 9482 9483 // C99 6.7.2.1p2: 9484 // A structure or union shall not contain a member with 9485 // incomplete or function type (hence, a structure shall not 9486 // contain an instance of itself, but may contain a pointer to 9487 // an instance of itself), except that the last member of a 9488 // structure with more than one named member may have incomplete 9489 // array type; such a structure (and any union containing, 9490 // possibly recursively, a member that is such a structure) 9491 // shall not be a member of a structure or an element of an 9492 // array. 9493 if (FDTy->isFunctionType()) { 9494 // Field declared as a function. 9495 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9496 << FD->getDeclName(); 9497 FD->setInvalidDecl(); 9498 EnclosingDecl->setInvalidDecl(); 9499 continue; 9500 } else if (FDTy->isIncompleteArrayType() && Record && 9501 ((i + 1 == Fields.end() && !Record->isUnion()) || 9502 ((getLangOpts().MicrosoftExt || 9503 getLangOpts().CPlusPlus) && 9504 (i + 1 == Fields.end() || Record->isUnion())))) { 9505 // Flexible array member. 9506 // Microsoft and g++ is more permissive regarding flexible array. 9507 // It will accept flexible array in union and also 9508 // as the sole element of a struct/class. 9509 if (getLangOpts().MicrosoftExt) { 9510 if (Record->isUnion()) 9511 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9512 << FD->getDeclName(); 9513 else if (Fields.size() == 1) 9514 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9515 << FD->getDeclName() << Record->getTagKind(); 9516 } else if (getLangOpts().CPlusPlus) { 9517 if (Record->isUnion()) 9518 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9519 << FD->getDeclName(); 9520 else if (Fields.size() == 1) 9521 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9522 << FD->getDeclName() << Record->getTagKind(); 9523 } else if (!getLangOpts().C99) { 9524 if (Record->isUnion()) 9525 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9526 << FD->getDeclName(); 9527 else 9528 Diag(FD->getLocation(), diag::ext_c99_flexible_array_member) 9529 << FD->getDeclName() << Record->getTagKind(); 9530 } else if (NumNamedMembers < 1) { 9531 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9532 << FD->getDeclName(); 9533 FD->setInvalidDecl(); 9534 EnclosingDecl->setInvalidDecl(); 9535 continue; 9536 } 9537 if (!FD->getType()->isDependentType() && 9538 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9539 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9540 << FD->getDeclName() << FD->getType(); 9541 FD->setInvalidDecl(); 9542 EnclosingDecl->setInvalidDecl(); 9543 continue; 9544 } 9545 // Okay, we have a legal flexible array member at the end of the struct. 9546 if (Record) 9547 Record->setHasFlexibleArrayMember(true); 9548 } else if (!FDTy->isDependentType() && 9549 RequireCompleteType(FD->getLocation(), FD->getType(), 9550 diag::err_field_incomplete)) { 9551 // Incomplete type 9552 FD->setInvalidDecl(); 9553 EnclosingDecl->setInvalidDecl(); 9554 continue; 9555 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9556 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9557 // If this is a member of a union, then entire union becomes "flexible". 9558 if (Record && Record->isUnion()) { 9559 Record->setHasFlexibleArrayMember(true); 9560 } else { 9561 // If this is a struct/class and this is not the last element, reject 9562 // it. Note that GCC supports variable sized arrays in the middle of 9563 // structures. 9564 if (i + 1 != Fields.end()) 9565 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9566 << FD->getDeclName() << FD->getType(); 9567 else { 9568 // We support flexible arrays at the end of structs in 9569 // other structs as an extension. 9570 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9571 << FD->getDeclName(); 9572 if (Record) 9573 Record->setHasFlexibleArrayMember(true); 9574 } 9575 } 9576 } 9577 if (Record && FDTTy->getDecl()->hasObjectMember()) 9578 Record->setHasObjectMember(true); 9579 } else if (FDTy->isObjCObjectType()) { 9580 /// A field cannot be an Objective-c object 9581 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9582 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9583 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9584 FD->setType(T); 9585 } 9586 else if (!getLangOpts().CPlusPlus) { 9587 if (getLangOpts().ObjCAutoRefCount && Record && !ARCErrReported) { 9588 // It's an error in ARC if a field has lifetime. 9589 // We don't want to report this in a system header, though, 9590 // so we just make the field unavailable. 9591 // FIXME: that's really not sufficient; we need to make the type 9592 // itself invalid to, say, initialize or copy. 9593 QualType T = FD->getType(); 9594 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9595 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9596 SourceLocation loc = FD->getLocation(); 9597 if (getSourceManager().isInSystemHeader(loc)) { 9598 if (!FD->hasAttr<UnavailableAttr>()) { 9599 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9600 "this system field has retaining ownership")); 9601 } 9602 } else { 9603 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9604 << T->isBlockPointerType(); 9605 } 9606 ARCErrReported = true; 9607 } 9608 } 9609 else if (getLangOpts().ObjC1 && 9610 getLangOpts().getGC() != LangOptions::NonGC && 9611 Record && !Record->hasObjectMember()) { 9612 if (FD->getType()->isObjCObjectPointerType() || 9613 FD->getType().isObjCGCStrong()) 9614 Record->setHasObjectMember(true); 9615 else if (Context.getAsArrayType(FD->getType())) { 9616 QualType BaseType = Context.getBaseElementType(FD->getType()); 9617 if (BaseType->isRecordType() && 9618 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9619 Record->setHasObjectMember(true); 9620 else if (BaseType->isObjCObjectPointerType() || 9621 BaseType.isObjCGCStrong()) 9622 Record->setHasObjectMember(true); 9623 } 9624 } 9625 } 9626 // Keep track of the number of named members. 9627 if (FD->getIdentifier()) 9628 ++NumNamedMembers; 9629 } 9630 9631 // Okay, we successfully defined 'Record'. 9632 if (Record) { 9633 bool Completed = false; 9634 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9635 if (!CXXRecord->isInvalidDecl()) { 9636 // Set access bits correctly on the directly-declared conversions. 9637 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9638 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9639 I != E; ++I) 9640 Convs->setAccess(I, (*I)->getAccess()); 9641 9642 if (!CXXRecord->isDependentType()) { 9643 // Objective-C Automatic Reference Counting: 9644 // If a class has a non-static data member of Objective-C pointer 9645 // type (or array thereof), it is a non-POD type and its 9646 // default constructor (if any), copy constructor, copy assignment 9647 // operator, and destructor are non-trivial. 9648 // 9649 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9650 // However, here we check whether this particular class is only 9651 // non-POD because of the presence of an Objective-C pointer member. 9652 // If so, objects of this type cannot be shared between code compiled 9653 // with instant objects and code compiled with manual retain/release. 9654 if (getLangOpts().ObjCAutoRefCount && 9655 CXXRecord->hasObjectMember() && 9656 CXXRecord->getLinkage() == ExternalLinkage) { 9657 if (CXXRecord->isPOD()) { 9658 Diag(CXXRecord->getLocation(), 9659 diag::warn_arc_non_pod_class_with_object_member) 9660 << CXXRecord; 9661 } else { 9662 // FIXME: Fix-Its would be nice here, but finding a good location 9663 // for them is going to be tricky. 9664 if (CXXRecord->hasTrivialCopyConstructor()) 9665 Diag(CXXRecord->getLocation(), 9666 diag::warn_arc_trivial_member_function_with_object_member) 9667 << CXXRecord << 0; 9668 if (CXXRecord->hasTrivialCopyAssignment()) 9669 Diag(CXXRecord->getLocation(), 9670 diag::warn_arc_trivial_member_function_with_object_member) 9671 << CXXRecord << 1; 9672 if (CXXRecord->hasTrivialDestructor()) 9673 Diag(CXXRecord->getLocation(), 9674 diag::warn_arc_trivial_member_function_with_object_member) 9675 << CXXRecord << 2; 9676 } 9677 } 9678 9679 // Adjust user-defined destructor exception spec. 9680 if (getLangOpts().CPlusPlus0x && 9681 CXXRecord->hasUserDeclaredDestructor()) 9682 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9683 9684 // Add any implicitly-declared members to this class. 9685 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9686 9687 // If we have virtual base classes, we may end up finding multiple 9688 // final overriders for a given virtual function. Check for this 9689 // problem now. 9690 if (CXXRecord->getNumVBases()) { 9691 CXXFinalOverriderMap FinalOverriders; 9692 CXXRecord->getFinalOverriders(FinalOverriders); 9693 9694 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9695 MEnd = FinalOverriders.end(); 9696 M != MEnd; ++M) { 9697 for (OverridingMethods::iterator SO = M->second.begin(), 9698 SOEnd = M->second.end(); 9699 SO != SOEnd; ++SO) { 9700 assert(SO->second.size() > 0 && 9701 "Virtual function without overridding functions?"); 9702 if (SO->second.size() == 1) 9703 continue; 9704 9705 // C++ [class.virtual]p2: 9706 // In a derived class, if a virtual member function of a base 9707 // class subobject has more than one final overrider the 9708 // program is ill-formed. 9709 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9710 << (NamedDecl *)M->first << Record; 9711 Diag(M->first->getLocation(), 9712 diag::note_overridden_virtual_function); 9713 for (OverridingMethods::overriding_iterator 9714 OM = SO->second.begin(), 9715 OMEnd = SO->second.end(); 9716 OM != OMEnd; ++OM) 9717 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9718 << (NamedDecl *)M->first << OM->Method->getParent(); 9719 9720 Record->setInvalidDecl(); 9721 } 9722 } 9723 CXXRecord->completeDefinition(&FinalOverriders); 9724 Completed = true; 9725 } 9726 } 9727 } 9728 } 9729 9730 if (!Completed) 9731 Record->completeDefinition(); 9732 9733 // Now that the record is complete, do any delayed exception spec checks 9734 // we were missing. 9735 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9736 const CXXDestructorDecl *Dtor = 9737 DelayedDestructorExceptionSpecChecks.back().first; 9738 if (Dtor->getParent() != Record) 9739 break; 9740 9741 assert(!Dtor->getParent()->isDependentType() && 9742 "Should not ever add destructors of templates into the list."); 9743 CheckOverridingFunctionExceptionSpec(Dtor, 9744 DelayedDestructorExceptionSpecChecks.back().second); 9745 DelayedDestructorExceptionSpecChecks.pop_back(); 9746 } 9747 9748 } else { 9749 ObjCIvarDecl **ClsFields = 9750 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9751 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9752 ID->setEndOfDefinitionLoc(RBrac); 9753 // Add ivar's to class's DeclContext. 9754 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9755 ClsFields[i]->setLexicalDeclContext(ID); 9756 ID->addDecl(ClsFields[i]); 9757 } 9758 // Must enforce the rule that ivars in the base classes may not be 9759 // duplicates. 9760 if (ID->getSuperClass()) 9761 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9762 } else if (ObjCImplementationDecl *IMPDecl = 9763 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9764 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9765 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9766 // Ivar declared in @implementation never belongs to the implementation. 9767 // Only it is in implementation's lexical context. 9768 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9769 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9770 IMPDecl->setIvarLBraceLoc(LBrac); 9771 IMPDecl->setIvarRBraceLoc(RBrac); 9772 } else if (ObjCCategoryDecl *CDecl = 9773 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9774 // case of ivars in class extension; all other cases have been 9775 // reported as errors elsewhere. 9776 // FIXME. Class extension does not have a LocEnd field. 9777 // CDecl->setLocEnd(RBrac); 9778 // Add ivar's to class extension's DeclContext. 9779 // Diagnose redeclaration of private ivars. 9780 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9781 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9782 if (IDecl) { 9783 if (const ObjCIvarDecl *ClsIvar = 9784 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9785 Diag(ClsFields[i]->getLocation(), 9786 diag::err_duplicate_ivar_declaration); 9787 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9788 continue; 9789 } 9790 for (const ObjCCategoryDecl *ClsExtDecl = 9791 IDecl->getFirstClassExtension(); 9792 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9793 if (const ObjCIvarDecl *ClsExtIvar = 9794 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9795 Diag(ClsFields[i]->getLocation(), 9796 diag::err_duplicate_ivar_declaration); 9797 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9798 continue; 9799 } 9800 } 9801 } 9802 ClsFields[i]->setLexicalDeclContext(CDecl); 9803 CDecl->addDecl(ClsFields[i]); 9804 } 9805 CDecl->setIvarLBraceLoc(LBrac); 9806 CDecl->setIvarRBraceLoc(RBrac); 9807 } 9808 } 9809 9810 if (Attr) 9811 ProcessDeclAttributeList(S, Record, Attr); 9812 9813 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9814 // set the visibility of this record. 9815 if (Record && !Record->getDeclContext()->isRecord()) 9816 AddPushedVisibilityAttribute(Record); 9817} 9818 9819/// \brief Determine whether the given integral value is representable within 9820/// the given type T. 9821static bool isRepresentableIntegerValue(ASTContext &Context, 9822 llvm::APSInt &Value, 9823 QualType T) { 9824 assert(T->isIntegralType(Context) && "Integral type required!"); 9825 unsigned BitWidth = Context.getIntWidth(T); 9826 9827 if (Value.isUnsigned() || Value.isNonNegative()) { 9828 if (T->isSignedIntegerOrEnumerationType()) 9829 --BitWidth; 9830 return Value.getActiveBits() <= BitWidth; 9831 } 9832 return Value.getMinSignedBits() <= BitWidth; 9833} 9834 9835// \brief Given an integral type, return the next larger integral type 9836// (or a NULL type of no such type exists). 9837static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9838 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9839 // enum checking below. 9840 assert(T->isIntegralType(Context) && "Integral type required!"); 9841 const unsigned NumTypes = 4; 9842 QualType SignedIntegralTypes[NumTypes] = { 9843 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9844 }; 9845 QualType UnsignedIntegralTypes[NumTypes] = { 9846 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9847 Context.UnsignedLongLongTy 9848 }; 9849 9850 unsigned BitWidth = Context.getTypeSize(T); 9851 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9852 : UnsignedIntegralTypes; 9853 for (unsigned I = 0; I != NumTypes; ++I) 9854 if (Context.getTypeSize(Types[I]) > BitWidth) 9855 return Types[I]; 9856 9857 return QualType(); 9858} 9859 9860EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9861 EnumConstantDecl *LastEnumConst, 9862 SourceLocation IdLoc, 9863 IdentifierInfo *Id, 9864 Expr *Val) { 9865 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9866 llvm::APSInt EnumVal(IntWidth); 9867 QualType EltTy; 9868 9869 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9870 Val = 0; 9871 9872 if (Val) 9873 Val = DefaultLvalueConversion(Val).take(); 9874 9875 if (Val) { 9876 if (Enum->isDependentType() || Val->isTypeDependent()) 9877 EltTy = Context.DependentTy; 9878 else { 9879 SourceLocation ExpLoc; 9880 if (getLangOpts().CPlusPlus0x && Enum->isFixed() && 9881 !getLangOpts().MicrosoftMode) { 9882 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the 9883 // constant-expression in the enumerator-definition shall be a converted 9884 // constant expression of the underlying type. 9885 EltTy = Enum->getIntegerType(); 9886 ExprResult Converted = 9887 CheckConvertedConstantExpression(Val, EltTy, EnumVal, 9888 CCEK_Enumerator); 9889 if (Converted.isInvalid()) 9890 Val = 0; 9891 else 9892 Val = Converted.take(); 9893 } else if (!Val->isValueDependent() && 9894 !(Val = VerifyIntegerConstantExpression(Val, 9895 &EnumVal).take())) { 9896 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9897 } else { 9898 if (Enum->isFixed()) { 9899 EltTy = Enum->getIntegerType(); 9900 9901 // In Obj-C and Microsoft mode, require the enumeration value to be 9902 // representable in the underlying type of the enumeration. In C++11, 9903 // we perform a non-narrowing conversion as part of converted constant 9904 // expression checking. 9905 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9906 if (getLangOpts().MicrosoftMode) { 9907 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9908 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9909 } else 9910 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy; 9911 } else 9912 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9913 } else if (getLangOpts().CPlusPlus) { 9914 // C++11 [dcl.enum]p5: 9915 // If the underlying type is not fixed, the type of each enumerator 9916 // is the type of its initializing value: 9917 // - If an initializer is specified for an enumerator, the 9918 // initializing value has the same type as the expression. 9919 EltTy = Val->getType(); 9920 } else { 9921 // C99 6.7.2.2p2: 9922 // The expression that defines the value of an enumeration constant 9923 // shall be an integer constant expression that has a value 9924 // representable as an int. 9925 9926 // Complain if the value is not representable in an int. 9927 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9928 Diag(IdLoc, diag::ext_enum_value_not_int) 9929 << EnumVal.toString(10) << Val->getSourceRange() 9930 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9931 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9932 // Force the type of the expression to 'int'. 9933 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9934 } 9935 EltTy = Val->getType(); 9936 } 9937 } 9938 } 9939 } 9940 9941 if (!Val) { 9942 if (Enum->isDependentType()) 9943 EltTy = Context.DependentTy; 9944 else if (!LastEnumConst) { 9945 // C++0x [dcl.enum]p5: 9946 // If the underlying type is not fixed, the type of each enumerator 9947 // is the type of its initializing value: 9948 // - If no initializer is specified for the first enumerator, the 9949 // initializing value has an unspecified integral type. 9950 // 9951 // GCC uses 'int' for its unspecified integral type, as does 9952 // C99 6.7.2.2p3. 9953 if (Enum->isFixed()) { 9954 EltTy = Enum->getIntegerType(); 9955 } 9956 else { 9957 EltTy = Context.IntTy; 9958 } 9959 } else { 9960 // Assign the last value + 1. 9961 EnumVal = LastEnumConst->getInitVal(); 9962 ++EnumVal; 9963 EltTy = LastEnumConst->getType(); 9964 9965 // Check for overflow on increment. 9966 if (EnumVal < LastEnumConst->getInitVal()) { 9967 // C++0x [dcl.enum]p5: 9968 // If the underlying type is not fixed, the type of each enumerator 9969 // is the type of its initializing value: 9970 // 9971 // - Otherwise the type of the initializing value is the same as 9972 // the type of the initializing value of the preceding enumerator 9973 // unless the incremented value is not representable in that type, 9974 // in which case the type is an unspecified integral type 9975 // sufficient to contain the incremented value. If no such type 9976 // exists, the program is ill-formed. 9977 QualType T = getNextLargerIntegralType(Context, EltTy); 9978 if (T.isNull() || Enum->isFixed()) { 9979 // There is no integral type larger enough to represent this 9980 // value. Complain, then allow the value to wrap around. 9981 EnumVal = LastEnumConst->getInitVal(); 9982 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9983 ++EnumVal; 9984 if (Enum->isFixed()) 9985 // When the underlying type is fixed, this is ill-formed. 9986 Diag(IdLoc, diag::err_enumerator_wrapped) 9987 << EnumVal.toString(10) 9988 << EltTy; 9989 else 9990 Diag(IdLoc, diag::warn_enumerator_too_large) 9991 << EnumVal.toString(10); 9992 } else { 9993 EltTy = T; 9994 } 9995 9996 // Retrieve the last enumerator's value, extent that type to the 9997 // type that is supposed to be large enough to represent the incremented 9998 // value, then increment. 9999 EnumVal = LastEnumConst->getInitVal(); 10000 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 10001 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 10002 ++EnumVal; 10003 10004 // If we're not in C++, diagnose the overflow of enumerator values, 10005 // which in C99 means that the enumerator value is not representable in 10006 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 10007 // permits enumerator values that are representable in some larger 10008 // integral type. 10009 if (!getLangOpts().CPlusPlus && !T.isNull()) 10010 Diag(IdLoc, diag::warn_enum_value_overflow); 10011 } else if (!getLangOpts().CPlusPlus && 10012 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 10013 // Enforce C99 6.7.2.2p2 even when we compute the next value. 10014 Diag(IdLoc, diag::ext_enum_value_not_int) 10015 << EnumVal.toString(10) << 1; 10016 } 10017 } 10018 } 10019 10020 if (!EltTy->isDependentType()) { 10021 // Make the enumerator value match the signedness and size of the 10022 // enumerator's type. 10023 EnumVal = EnumVal.extOrTrunc(Context.getIntWidth(EltTy)); 10024 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 10025 } 10026 10027 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 10028 Val, EnumVal); 10029} 10030 10031 10032Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 10033 SourceLocation IdLoc, IdentifierInfo *Id, 10034 AttributeList *Attr, 10035 SourceLocation EqualLoc, Expr *Val) { 10036 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 10037 EnumConstantDecl *LastEnumConst = 10038 cast_or_null<EnumConstantDecl>(lastEnumConst); 10039 10040 // The scope passed in may not be a decl scope. Zip up the scope tree until 10041 // we find one that is. 10042 S = getNonFieldDeclScope(S); 10043 10044 // Verify that there isn't already something declared with this name in this 10045 // scope. 10046 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 10047 ForRedeclaration); 10048 if (PrevDecl && PrevDecl->isTemplateParameter()) { 10049 // Maybe we will complain about the shadowed template parameter. 10050 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 10051 // Just pretend that we didn't see the previous declaration. 10052 PrevDecl = 0; 10053 } 10054 10055 if (PrevDecl) { 10056 // When in C++, we may get a TagDecl with the same name; in this case the 10057 // enum constant will 'hide' the tag. 10058 assert((getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 10059 "Received TagDecl when not in C++!"); 10060 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 10061 if (isa<EnumConstantDecl>(PrevDecl)) 10062 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 10063 else 10064 Diag(IdLoc, diag::err_redefinition) << Id; 10065 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 10066 return 0; 10067 } 10068 } 10069 10070 // C++ [class.mem]p13: 10071 // If T is the name of a class, then each of the following shall have a 10072 // name different from T: 10073 // - every enumerator of every member of class T that is an enumerated 10074 // type 10075 if (CXXRecordDecl *Record 10076 = dyn_cast<CXXRecordDecl>( 10077 TheEnumDecl->getDeclContext()->getRedeclContext())) 10078 if (Record->getIdentifier() && Record->getIdentifier() == Id) 10079 Diag(IdLoc, diag::err_member_name_of_class) << Id; 10080 10081 EnumConstantDecl *New = 10082 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 10083 10084 if (New) { 10085 // Process attributes. 10086 if (Attr) ProcessDeclAttributeList(S, New, Attr); 10087 10088 // Register this decl in the current scope stack. 10089 New->setAccess(TheEnumDecl->getAccess()); 10090 PushOnScopeChains(New, S); 10091 } 10092 10093 return New; 10094} 10095 10096void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 10097 SourceLocation RBraceLoc, Decl *EnumDeclX, 10098 Decl **Elements, unsigned NumElements, 10099 Scope *S, AttributeList *Attr) { 10100 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 10101 QualType EnumType = Context.getTypeDeclType(Enum); 10102 10103 if (Attr) 10104 ProcessDeclAttributeList(S, Enum, Attr); 10105 10106 if (Enum->isDependentType()) { 10107 for (unsigned i = 0; i != NumElements; ++i) { 10108 EnumConstantDecl *ECD = 10109 cast_or_null<EnumConstantDecl>(Elements[i]); 10110 if (!ECD) continue; 10111 10112 ECD->setType(EnumType); 10113 } 10114 10115 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 10116 return; 10117 } 10118 10119 // TODO: If the result value doesn't fit in an int, it must be a long or long 10120 // long value. ISO C does not support this, but GCC does as an extension, 10121 // emit a warning. 10122 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 10123 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 10124 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 10125 10126 // Verify that all the values are okay, compute the size of the values, and 10127 // reverse the list. 10128 unsigned NumNegativeBits = 0; 10129 unsigned NumPositiveBits = 0; 10130 10131 // Keep track of whether all elements have type int. 10132 bool AllElementsInt = true; 10133 10134 for (unsigned i = 0; i != NumElements; ++i) { 10135 EnumConstantDecl *ECD = 10136 cast_or_null<EnumConstantDecl>(Elements[i]); 10137 if (!ECD) continue; // Already issued a diagnostic. 10138 10139 const llvm::APSInt &InitVal = ECD->getInitVal(); 10140 10141 // Keep track of the size of positive and negative values. 10142 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 10143 NumPositiveBits = std::max(NumPositiveBits, 10144 (unsigned)InitVal.getActiveBits()); 10145 else 10146 NumNegativeBits = std::max(NumNegativeBits, 10147 (unsigned)InitVal.getMinSignedBits()); 10148 10149 // Keep track of whether every enum element has type int (very commmon). 10150 if (AllElementsInt) 10151 AllElementsInt = ECD->getType() == Context.IntTy; 10152 } 10153 10154 // Figure out the type that should be used for this enum. 10155 QualType BestType; 10156 unsigned BestWidth; 10157 10158 // C++0x N3000 [conv.prom]p3: 10159 // An rvalue of an unscoped enumeration type whose underlying 10160 // type is not fixed can be converted to an rvalue of the first 10161 // of the following types that can represent all the values of 10162 // the enumeration: int, unsigned int, long int, unsigned long 10163 // int, long long int, or unsigned long long int. 10164 // C99 6.4.4.3p2: 10165 // An identifier declared as an enumeration constant has type int. 10166 // The C99 rule is modified by a gcc extension 10167 QualType BestPromotionType; 10168 10169 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 10170 // -fshort-enums is the equivalent to specifying the packed attribute on all 10171 // enum definitions. 10172 if (LangOpts.ShortEnums) 10173 Packed = true; 10174 10175 if (Enum->isFixed()) { 10176 BestType = Enum->getIntegerType(); 10177 if (BestType->isPromotableIntegerType()) 10178 BestPromotionType = Context.getPromotedIntegerType(BestType); 10179 else 10180 BestPromotionType = BestType; 10181 // We don't need to set BestWidth, because BestType is going to be the type 10182 // of the enumerators, but we do anyway because otherwise some compilers 10183 // warn that it might be used uninitialized. 10184 BestWidth = CharWidth; 10185 } 10186 else if (NumNegativeBits) { 10187 // If there is a negative value, figure out the smallest integer type (of 10188 // int/long/longlong) that fits. 10189 // If it's packed, check also if it fits a char or a short. 10190 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 10191 BestType = Context.SignedCharTy; 10192 BestWidth = CharWidth; 10193 } else if (Packed && NumNegativeBits <= ShortWidth && 10194 NumPositiveBits < ShortWidth) { 10195 BestType = Context.ShortTy; 10196 BestWidth = ShortWidth; 10197 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 10198 BestType = Context.IntTy; 10199 BestWidth = IntWidth; 10200 } else { 10201 BestWidth = Context.getTargetInfo().getLongWidth(); 10202 10203 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 10204 BestType = Context.LongTy; 10205 } else { 10206 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10207 10208 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 10209 Diag(Enum->getLocation(), diag::warn_enum_too_large); 10210 BestType = Context.LongLongTy; 10211 } 10212 } 10213 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 10214 } else { 10215 // If there is no negative value, figure out the smallest type that fits 10216 // all of the enumerator values. 10217 // If it's packed, check also if it fits a char or a short. 10218 if (Packed && NumPositiveBits <= CharWidth) { 10219 BestType = Context.UnsignedCharTy; 10220 BestPromotionType = Context.IntTy; 10221 BestWidth = CharWidth; 10222 } else if (Packed && NumPositiveBits <= ShortWidth) { 10223 BestType = Context.UnsignedShortTy; 10224 BestPromotionType = Context.IntTy; 10225 BestWidth = ShortWidth; 10226 } else if (NumPositiveBits <= IntWidth) { 10227 BestType = Context.UnsignedIntTy; 10228 BestWidth = IntWidth; 10229 BestPromotionType 10230 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10231 ? Context.UnsignedIntTy : Context.IntTy; 10232 } else if (NumPositiveBits <= 10233 (BestWidth = Context.getTargetInfo().getLongWidth())) { 10234 BestType = Context.UnsignedLongTy; 10235 BestPromotionType 10236 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10237 ? Context.UnsignedLongTy : Context.LongTy; 10238 } else { 10239 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10240 assert(NumPositiveBits <= BestWidth && 10241 "How could an initializer get larger than ULL?"); 10242 BestType = Context.UnsignedLongLongTy; 10243 BestPromotionType 10244 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus) 10245 ? Context.UnsignedLongLongTy : Context.LongLongTy; 10246 } 10247 } 10248 10249 // Loop over all of the enumerator constants, changing their types to match 10250 // the type of the enum if needed. 10251 for (unsigned i = 0; i != NumElements; ++i) { 10252 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 10253 if (!ECD) continue; // Already issued a diagnostic. 10254 10255 // Standard C says the enumerators have int type, but we allow, as an 10256 // extension, the enumerators to be larger than int size. If each 10257 // enumerator value fits in an int, type it as an int, otherwise type it the 10258 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 10259 // that X has type 'int', not 'unsigned'. 10260 10261 // Determine whether the value fits into an int. 10262 llvm::APSInt InitVal = ECD->getInitVal(); 10263 10264 // If it fits into an integer type, force it. Otherwise force it to match 10265 // the enum decl type. 10266 QualType NewTy; 10267 unsigned NewWidth; 10268 bool NewSign; 10269 if (!getLangOpts().CPlusPlus && 10270 !Enum->isFixed() && 10271 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 10272 NewTy = Context.IntTy; 10273 NewWidth = IntWidth; 10274 NewSign = true; 10275 } else if (ECD->getType() == BestType) { 10276 // Already the right type! 10277 if (getLangOpts().CPlusPlus) 10278 // C++ [dcl.enum]p4: Following the closing brace of an 10279 // enum-specifier, each enumerator has the type of its 10280 // enumeration. 10281 ECD->setType(EnumType); 10282 continue; 10283 } else { 10284 NewTy = BestType; 10285 NewWidth = BestWidth; 10286 NewSign = BestType->isSignedIntegerOrEnumerationType(); 10287 } 10288 10289 // Adjust the APSInt value. 10290 InitVal = InitVal.extOrTrunc(NewWidth); 10291 InitVal.setIsSigned(NewSign); 10292 ECD->setInitVal(InitVal); 10293 10294 // Adjust the Expr initializer and type. 10295 if (ECD->getInitExpr() && 10296 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 10297 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 10298 CK_IntegralCast, 10299 ECD->getInitExpr(), 10300 /*base paths*/ 0, 10301 VK_RValue)); 10302 if (getLangOpts().CPlusPlus) 10303 // C++ [dcl.enum]p4: Following the closing brace of an 10304 // enum-specifier, each enumerator has the type of its 10305 // enumeration. 10306 ECD->setType(EnumType); 10307 else 10308 ECD->setType(NewTy); 10309 } 10310 10311 Enum->completeDefinition(BestType, BestPromotionType, 10312 NumPositiveBits, NumNegativeBits); 10313 10314 // If we're declaring a function, ensure this decl isn't forgotten about - 10315 // it needs to go into the function scope. 10316 if (InFunctionDeclarator) 10317 DeclsInPrototypeScope.push_back(Enum); 10318 10319} 10320 10321Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 10322 SourceLocation StartLoc, 10323 SourceLocation EndLoc) { 10324 StringLiteral *AsmString = cast<StringLiteral>(expr); 10325 10326 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 10327 AsmString, StartLoc, 10328 EndLoc); 10329 CurContext->addDecl(New); 10330 return New; 10331} 10332 10333DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 10334 SourceLocation ImportLoc, 10335 ModuleIdPath Path) { 10336 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 10337 Module::AllVisible, 10338 /*IsIncludeDirective=*/false); 10339 if (!Mod) 10340 return true; 10341 10342 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 10343 Module *ModCheck = Mod; 10344 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 10345 // If we've run out of module parents, just drop the remaining identifiers. 10346 // We need the length to be consistent. 10347 if (!ModCheck) 10348 break; 10349 ModCheck = ModCheck->Parent; 10350 10351 IdentifierLocs.push_back(Path[I].second); 10352 } 10353 10354 ImportDecl *Import = ImportDecl::Create(Context, 10355 Context.getTranslationUnitDecl(), 10356 AtLoc.isValid()? AtLoc : ImportLoc, 10357 Mod, IdentifierLocs); 10358 Context.getTranslationUnitDecl()->addDecl(Import); 10359 return Import; 10360} 10361 10362void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name, 10363 IdentifierInfo* AliasName, 10364 SourceLocation PragmaLoc, 10365 SourceLocation NameLoc, 10366 SourceLocation AliasNameLoc) { 10367 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, 10368 LookupOrdinaryName); 10369 AsmLabelAttr *Attr = 10370 ::new (Context) AsmLabelAttr(AliasNameLoc, Context, AliasName->getName()); 10371 10372 if (PrevDecl) 10373 PrevDecl->addAttr(Attr); 10374 else 10375 (void)ExtnameUndeclaredIdentifiers.insert( 10376 std::pair<IdentifierInfo*,AsmLabelAttr*>(Name, Attr)); 10377} 10378 10379void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 10380 SourceLocation PragmaLoc, 10381 SourceLocation NameLoc) { 10382 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 10383 10384 if (PrevDecl) { 10385 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 10386 } else { 10387 (void)WeakUndeclaredIdentifiers.insert( 10388 std::pair<IdentifierInfo*,WeakInfo> 10389 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 10390 } 10391} 10392 10393void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 10394 IdentifierInfo* AliasName, 10395 SourceLocation PragmaLoc, 10396 SourceLocation NameLoc, 10397 SourceLocation AliasNameLoc) { 10398 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 10399 LookupOrdinaryName); 10400 WeakInfo W = WeakInfo(Name, NameLoc); 10401 10402 if (PrevDecl) { 10403 if (!PrevDecl->hasAttr<AliasAttr>()) 10404 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 10405 DeclApplyPragmaWeak(TUScope, ND, W); 10406 } else { 10407 (void)WeakUndeclaredIdentifiers.insert( 10408 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 10409 } 10410} 10411 10412Decl *Sema::getObjCDeclContext() const { 10413 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 10414} 10415 10416AvailabilityResult Sema::getCurContextAvailability() const { 10417 const Decl *D = cast<Decl>(getCurLexicalContext()); 10418 // A category implicitly has the availability of the interface. 10419 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 10420 D = CatD->getClassInterface(); 10421 10422 return D->getAvailability(); 10423} 10424