SemaDecl.cpp revision d37b360bf9f954af119c9805fdc79ab9d30e06c6
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 !(getLangOptions().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(getLangOptions())); 203 std::string CorrectedQuotedStr( 204 Correction.getQuoted(getLangOptions())); 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(getLangOptions())); 377 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 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 (getLangOptions().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 (getLangOptions().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().getLangOptions().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 (getLangOptions().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 (!getLangOptions().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 << getLangOptions().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(getLangOptions())); 584 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 585 586 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 587 NamedDecl *UnderlyingFirstDecl 588 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 589 if (getLangOptions().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 (getLangOptions().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 (getLangOptions().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.getLangOptions().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 ((getLangOptions().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.getLangOptions(), 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 1252/// \brief Look for an Objective-C class in the translation unit. 1253/// 1254/// \param Id The name of the Objective-C class we're looking for. If 1255/// typo-correction fixes this name, the Id will be updated 1256/// to the fixed name. 1257/// 1258/// \param IdLoc The location of the name in the translation unit. 1259/// 1260/// \param TypoCorrection If true, this routine will attempt typo correction 1261/// if there is no class with the given name. 1262/// 1263/// \returns The declaration of the named Objective-C class, or NULL if the 1264/// class could not be found. 1265ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1266 SourceLocation IdLoc, 1267 bool DoTypoCorrection) { 1268 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1269 // creation from this context. 1270 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1271 1272 if (!IDecl && DoTypoCorrection) { 1273 // Perform typo correction at the given location, but only if we 1274 // find an Objective-C class name. 1275 DeclFilterCCC<ObjCInterfaceDecl> Validator; 1276 if (TypoCorrection C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), 1277 LookupOrdinaryName, TUScope, NULL, 1278 Validator)) { 1279 IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>(); 1280 Diag(IdLoc, diag::err_undef_interface_suggest) 1281 << Id << IDecl->getDeclName() 1282 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1283 Diag(IDecl->getLocation(), diag::note_previous_decl) 1284 << IDecl->getDeclName(); 1285 1286 Id = IDecl->getIdentifier(); 1287 } 1288 } 1289 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1290 // This routine must always return a class definition, if any. 1291 if (Def && Def->getDefinition()) 1292 Def = Def->getDefinition(); 1293 return Def; 1294} 1295 1296/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1297/// from S, where a non-field would be declared. This routine copes 1298/// with the difference between C and C++ scoping rules in structs and 1299/// unions. For example, the following code is well-formed in C but 1300/// ill-formed in C++: 1301/// @code 1302/// struct S6 { 1303/// enum { BAR } e; 1304/// }; 1305/// 1306/// void test_S6() { 1307/// struct S6 a; 1308/// a.e = BAR; 1309/// } 1310/// @endcode 1311/// For the declaration of BAR, this routine will return a different 1312/// scope. The scope S will be the scope of the unnamed enumeration 1313/// within S6. In C++, this routine will return the scope associated 1314/// with S6, because the enumeration's scope is a transparent 1315/// context but structures can contain non-field names. In C, this 1316/// routine will return the translation unit scope, since the 1317/// enumeration's scope is a transparent context and structures cannot 1318/// contain non-field names. 1319Scope *Sema::getNonFieldDeclScope(Scope *S) { 1320 while (((S->getFlags() & Scope::DeclScope) == 0) || 1321 (S->getEntity() && 1322 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1323 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1324 S = S->getParent(); 1325 return S; 1326} 1327 1328/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1329/// file scope. lazily create a decl for it. ForRedeclaration is true 1330/// if we're creating this built-in in anticipation of redeclaring the 1331/// built-in. 1332NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1333 Scope *S, bool ForRedeclaration, 1334 SourceLocation Loc) { 1335 Builtin::ID BID = (Builtin::ID)bid; 1336 1337 ASTContext::GetBuiltinTypeError Error; 1338 QualType R = Context.GetBuiltinType(BID, Error); 1339 switch (Error) { 1340 case ASTContext::GE_None: 1341 // Okay 1342 break; 1343 1344 case ASTContext::GE_Missing_stdio: 1345 if (ForRedeclaration) 1346 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1347 << Context.BuiltinInfo.GetName(BID); 1348 return 0; 1349 1350 case ASTContext::GE_Missing_setjmp: 1351 if (ForRedeclaration) 1352 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1353 << Context.BuiltinInfo.GetName(BID); 1354 return 0; 1355 1356 case ASTContext::GE_Missing_ucontext: 1357 if (ForRedeclaration) 1358 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1359 << Context.BuiltinInfo.GetName(BID); 1360 return 0; 1361 } 1362 1363 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1364 Diag(Loc, diag::ext_implicit_lib_function_decl) 1365 << Context.BuiltinInfo.GetName(BID) 1366 << R; 1367 if (Context.BuiltinInfo.getHeaderName(BID) && 1368 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1369 != DiagnosticsEngine::Ignored) 1370 Diag(Loc, diag::note_please_include_header) 1371 << Context.BuiltinInfo.getHeaderName(BID) 1372 << Context.BuiltinInfo.GetName(BID); 1373 } 1374 1375 FunctionDecl *New = FunctionDecl::Create(Context, 1376 Context.getTranslationUnitDecl(), 1377 Loc, Loc, II, R, /*TInfo=*/0, 1378 SC_Extern, 1379 SC_None, false, 1380 /*hasPrototype=*/true); 1381 New->setImplicit(); 1382 1383 // Create Decl objects for each parameter, adding them to the 1384 // FunctionDecl. 1385 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1386 SmallVector<ParmVarDecl*, 16> Params; 1387 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1388 ParmVarDecl *parm = 1389 ParmVarDecl::Create(Context, New, SourceLocation(), 1390 SourceLocation(), 0, 1391 FT->getArgType(i), /*TInfo=*/0, 1392 SC_None, SC_None, 0); 1393 parm->setScopeInfo(0, i); 1394 Params.push_back(parm); 1395 } 1396 New->setParams(Params); 1397 } 1398 1399 AddKnownFunctionAttributes(New); 1400 1401 // TUScope is the translation-unit scope to insert this function into. 1402 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1403 // relate Scopes to DeclContexts, and probably eliminate CurContext 1404 // entirely, but we're not there yet. 1405 DeclContext *SavedContext = CurContext; 1406 CurContext = Context.getTranslationUnitDecl(); 1407 PushOnScopeChains(New, TUScope); 1408 CurContext = SavedContext; 1409 return New; 1410} 1411 1412bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { 1413 QualType OldType; 1414 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1415 OldType = OldTypedef->getUnderlyingType(); 1416 else 1417 OldType = Context.getTypeDeclType(Old); 1418 QualType NewType = New->getUnderlyingType(); 1419 1420 if (NewType->isVariablyModifiedType()) { 1421 // Must not redefine a typedef with a variably-modified type. 1422 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1423 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef) 1424 << Kind << NewType; 1425 if (Old->getLocation().isValid()) 1426 Diag(Old->getLocation(), diag::note_previous_definition); 1427 New->setInvalidDecl(); 1428 return true; 1429 } 1430 1431 if (OldType != NewType && 1432 !OldType->isDependentType() && 1433 !NewType->isDependentType() && 1434 !Context.hasSameType(OldType, NewType)) { 1435 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1436 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1437 << Kind << NewType << OldType; 1438 if (Old->getLocation().isValid()) 1439 Diag(Old->getLocation(), diag::note_previous_definition); 1440 New->setInvalidDecl(); 1441 return true; 1442 } 1443 return false; 1444} 1445 1446/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1447/// same name and scope as a previous declaration 'Old'. Figure out 1448/// how to resolve this situation, merging decls or emitting 1449/// diagnostics as appropriate. If there was an error, set New to be invalid. 1450/// 1451void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1452 // If the new decl is known invalid already, don't bother doing any 1453 // merging checks. 1454 if (New->isInvalidDecl()) return; 1455 1456 // Allow multiple definitions for ObjC built-in typedefs. 1457 // FIXME: Verify the underlying types are equivalent! 1458 if (getLangOptions().ObjC1) { 1459 const IdentifierInfo *TypeID = New->getIdentifier(); 1460 switch (TypeID->getLength()) { 1461 default: break; 1462 case 2: 1463 if (!TypeID->isStr("id")) 1464 break; 1465 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1466 // Install the built-in type for 'id', ignoring the current definition. 1467 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1468 return; 1469 case 5: 1470 if (!TypeID->isStr("Class")) 1471 break; 1472 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1473 // Install the built-in type for 'Class', ignoring the current definition. 1474 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1475 return; 1476 case 3: 1477 if (!TypeID->isStr("SEL")) 1478 break; 1479 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1480 // Install the built-in type for 'SEL', ignoring the current definition. 1481 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1482 return; 1483 } 1484 // Fall through - the typedef name was not a builtin type. 1485 } 1486 1487 // Verify the old decl was also a type. 1488 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1489 if (!Old) { 1490 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1491 << New->getDeclName(); 1492 1493 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1494 if (OldD->getLocation().isValid()) 1495 Diag(OldD->getLocation(), diag::note_previous_definition); 1496 1497 return New->setInvalidDecl(); 1498 } 1499 1500 // If the old declaration is invalid, just give up here. 1501 if (Old->isInvalidDecl()) 1502 return New->setInvalidDecl(); 1503 1504 // If the typedef types are not identical, reject them in all languages and 1505 // with any extensions enabled. 1506 if (isIncompatibleTypedef(Old, New)) 1507 return; 1508 1509 // The types match. Link up the redeclaration chain if the old 1510 // declaration was a typedef. 1511 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1512 New->setPreviousDeclaration(Typedef); 1513 1514 if (getLangOptions().MicrosoftExt) 1515 return; 1516 1517 if (getLangOptions().CPlusPlus) { 1518 // C++ [dcl.typedef]p2: 1519 // In a given non-class scope, a typedef specifier can be used to 1520 // redefine the name of any type declared in that scope to refer 1521 // to the type to which it already refers. 1522 if (!isa<CXXRecordDecl>(CurContext)) 1523 return; 1524 1525 // C++0x [dcl.typedef]p4: 1526 // In a given class scope, a typedef specifier can be used to redefine 1527 // any class-name declared in that scope that is not also a typedef-name 1528 // to refer to the type to which it already refers. 1529 // 1530 // This wording came in via DR424, which was a correction to the 1531 // wording in DR56, which accidentally banned code like: 1532 // 1533 // struct S { 1534 // typedef struct A { } A; 1535 // }; 1536 // 1537 // in the C++03 standard. We implement the C++0x semantics, which 1538 // allow the above but disallow 1539 // 1540 // struct S { 1541 // typedef int I; 1542 // typedef int I; 1543 // }; 1544 // 1545 // since that was the intent of DR56. 1546 if (!isa<TypedefNameDecl>(Old)) 1547 return; 1548 1549 Diag(New->getLocation(), diag::err_redefinition) 1550 << New->getDeclName(); 1551 Diag(Old->getLocation(), diag::note_previous_definition); 1552 return New->setInvalidDecl(); 1553 } 1554 1555 // Modules always permit redefinition of typedefs, as does C11. 1556 if (getLangOptions().Modules || getLangOptions().C11) 1557 return; 1558 1559 // If we have a redefinition of a typedef in C, emit a warning. This warning 1560 // is normally mapped to an error, but can be controlled with 1561 // -Wtypedef-redefinition. If either the original or the redefinition is 1562 // in a system header, don't emit this for compatibility with GCC. 1563 if (getDiagnostics().getSuppressSystemWarnings() && 1564 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1565 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1566 return; 1567 1568 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1569 << New->getDeclName(); 1570 Diag(Old->getLocation(), diag::note_previous_definition); 1571 return; 1572} 1573 1574/// DeclhasAttr - returns true if decl Declaration already has the target 1575/// attribute. 1576static bool 1577DeclHasAttr(const Decl *D, const Attr *A) { 1578 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1579 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1580 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1581 if ((*i)->getKind() == A->getKind()) { 1582 if (Ann) { 1583 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1584 return true; 1585 continue; 1586 } 1587 // FIXME: Don't hardcode this check 1588 if (OA && isa<OwnershipAttr>(*i)) 1589 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1590 return true; 1591 } 1592 1593 return false; 1594} 1595 1596/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1597void Sema::mergeDeclAttributes(Decl *New, Decl *Old, 1598 bool MergeDeprecation) { 1599 if (!Old->hasAttrs()) 1600 return; 1601 1602 bool foundAny = New->hasAttrs(); 1603 1604 // Ensure that any moving of objects within the allocated map is done before 1605 // we process them. 1606 if (!foundAny) New->setAttrs(AttrVec()); 1607 1608 for (specific_attr_iterator<InheritableAttr> 1609 i = Old->specific_attr_begin<InheritableAttr>(), 1610 e = Old->specific_attr_end<InheritableAttr>(); 1611 i != e; ++i) { 1612 // Ignore deprecated/unavailable/availability attributes if requested. 1613 if (!MergeDeprecation && 1614 (isa<DeprecatedAttr>(*i) || 1615 isa<UnavailableAttr>(*i) || 1616 isa<AvailabilityAttr>(*i))) 1617 continue; 1618 1619 if (!DeclHasAttr(New, *i)) { 1620 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(Context)); 1621 newAttr->setInherited(true); 1622 New->addAttr(newAttr); 1623 foundAny = true; 1624 } 1625 } 1626 1627 if (!foundAny) New->dropAttrs(); 1628} 1629 1630/// mergeParamDeclAttributes - Copy attributes from the old parameter 1631/// to the new one. 1632static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1633 const ParmVarDecl *oldDecl, 1634 ASTContext &C) { 1635 if (!oldDecl->hasAttrs()) 1636 return; 1637 1638 bool foundAny = newDecl->hasAttrs(); 1639 1640 // Ensure that any moving of objects within the allocated map is 1641 // done before we process them. 1642 if (!foundAny) newDecl->setAttrs(AttrVec()); 1643 1644 for (specific_attr_iterator<InheritableParamAttr> 1645 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1646 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1647 if (!DeclHasAttr(newDecl, *i)) { 1648 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1649 newAttr->setInherited(true); 1650 newDecl->addAttr(newAttr); 1651 foundAny = true; 1652 } 1653 } 1654 1655 if (!foundAny) newDecl->dropAttrs(); 1656} 1657 1658namespace { 1659 1660/// Used in MergeFunctionDecl to keep track of function parameters in 1661/// C. 1662struct GNUCompatibleParamWarning { 1663 ParmVarDecl *OldParm; 1664 ParmVarDecl *NewParm; 1665 QualType PromotedType; 1666}; 1667 1668} 1669 1670/// getSpecialMember - get the special member enum for a method. 1671Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1672 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1673 if (Ctor->isDefaultConstructor()) 1674 return Sema::CXXDefaultConstructor; 1675 1676 if (Ctor->isCopyConstructor()) 1677 return Sema::CXXCopyConstructor; 1678 1679 if (Ctor->isMoveConstructor()) 1680 return Sema::CXXMoveConstructor; 1681 } else if (isa<CXXDestructorDecl>(MD)) { 1682 return Sema::CXXDestructor; 1683 } else if (MD->isCopyAssignmentOperator()) { 1684 return Sema::CXXCopyAssignment; 1685 } else if (MD->isMoveAssignmentOperator()) { 1686 return Sema::CXXMoveAssignment; 1687 } 1688 1689 return Sema::CXXInvalid; 1690} 1691 1692/// canRedefineFunction - checks if a function can be redefined. Currently, 1693/// only extern inline functions can be redefined, and even then only in 1694/// GNU89 mode. 1695static bool canRedefineFunction(const FunctionDecl *FD, 1696 const LangOptions& LangOpts) { 1697 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1698 !LangOpts.CPlusPlus && 1699 FD->isInlineSpecified() && 1700 FD->getStorageClass() == SC_Extern); 1701} 1702 1703/// MergeFunctionDecl - We just parsed a function 'New' from 1704/// declarator D which has the same name and scope as a previous 1705/// declaration 'Old'. Figure out how to resolve this situation, 1706/// merging decls or emitting diagnostics as appropriate. 1707/// 1708/// In C++, New and Old must be declarations that are not 1709/// overloaded. Use IsOverload to determine whether New and Old are 1710/// overloaded, and to select the Old declaration that New should be 1711/// merged with. 1712/// 1713/// Returns true if there was an error, false otherwise. 1714bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1715 // Verify the old decl was also a function. 1716 FunctionDecl *Old = 0; 1717 if (FunctionTemplateDecl *OldFunctionTemplate 1718 = dyn_cast<FunctionTemplateDecl>(OldD)) 1719 Old = OldFunctionTemplate->getTemplatedDecl(); 1720 else 1721 Old = dyn_cast<FunctionDecl>(OldD); 1722 if (!Old) { 1723 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1724 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1725 Diag(Shadow->getTargetDecl()->getLocation(), 1726 diag::note_using_decl_target); 1727 Diag(Shadow->getUsingDecl()->getLocation(), 1728 diag::note_using_decl) << 0; 1729 return true; 1730 } 1731 1732 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1733 << New->getDeclName(); 1734 Diag(OldD->getLocation(), diag::note_previous_definition); 1735 return true; 1736 } 1737 1738 // Determine whether the previous declaration was a definition, 1739 // implicit declaration, or a declaration. 1740 diag::kind PrevDiag; 1741 if (Old->isThisDeclarationADefinition()) 1742 PrevDiag = diag::note_previous_definition; 1743 else if (Old->isImplicit()) 1744 PrevDiag = diag::note_previous_implicit_declaration; 1745 else 1746 PrevDiag = diag::note_previous_declaration; 1747 1748 QualType OldQType = Context.getCanonicalType(Old->getType()); 1749 QualType NewQType = Context.getCanonicalType(New->getType()); 1750 1751 // Don't complain about this if we're in GNU89 mode and the old function 1752 // is an extern inline function. 1753 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1754 New->getStorageClass() == SC_Static && 1755 Old->getStorageClass() != SC_Static && 1756 !canRedefineFunction(Old, getLangOptions())) { 1757 if (getLangOptions().MicrosoftExt) { 1758 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1759 Diag(Old->getLocation(), PrevDiag); 1760 } else { 1761 Diag(New->getLocation(), diag::err_static_non_static) << New; 1762 Diag(Old->getLocation(), PrevDiag); 1763 return true; 1764 } 1765 } 1766 1767 // If a function is first declared with a calling convention, but is 1768 // later declared or defined without one, the second decl assumes the 1769 // calling convention of the first. 1770 // 1771 // For the new decl, we have to look at the NON-canonical type to tell the 1772 // difference between a function that really doesn't have a calling 1773 // convention and one that is declared cdecl. That's because in 1774 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1775 // because it is the default calling convention. 1776 // 1777 // Note also that we DO NOT return at this point, because we still have 1778 // other tests to run. 1779 const FunctionType *OldType = cast<FunctionType>(OldQType); 1780 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1781 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1782 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1783 bool RequiresAdjustment = false; 1784 if (OldTypeInfo.getCC() != CC_Default && 1785 NewTypeInfo.getCC() == CC_Default) { 1786 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1787 RequiresAdjustment = true; 1788 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1789 NewTypeInfo.getCC())) { 1790 // Calling conventions really aren't compatible, so complain. 1791 Diag(New->getLocation(), diag::err_cconv_change) 1792 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1793 << (OldTypeInfo.getCC() == CC_Default) 1794 << (OldTypeInfo.getCC() == CC_Default ? "" : 1795 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1796 Diag(Old->getLocation(), diag::note_previous_declaration); 1797 return true; 1798 } 1799 1800 // FIXME: diagnose the other way around? 1801 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1802 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1803 RequiresAdjustment = true; 1804 } 1805 1806 // Merge regparm attribute. 1807 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1808 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1809 if (NewTypeInfo.getHasRegParm()) { 1810 Diag(New->getLocation(), diag::err_regparm_mismatch) 1811 << NewType->getRegParmType() 1812 << OldType->getRegParmType(); 1813 Diag(Old->getLocation(), diag::note_previous_declaration); 1814 return true; 1815 } 1816 1817 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1818 RequiresAdjustment = true; 1819 } 1820 1821 // Merge ns_returns_retained attribute. 1822 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1823 if (NewTypeInfo.getProducesResult()) { 1824 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1825 Diag(Old->getLocation(), diag::note_previous_declaration); 1826 return true; 1827 } 1828 1829 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1830 RequiresAdjustment = true; 1831 } 1832 1833 if (RequiresAdjustment) { 1834 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1835 New->setType(QualType(NewType, 0)); 1836 NewQType = Context.getCanonicalType(New->getType()); 1837 } 1838 1839 if (getLangOptions().CPlusPlus) { 1840 // (C++98 13.1p2): 1841 // Certain function declarations cannot be overloaded: 1842 // -- Function declarations that differ only in the return type 1843 // cannot be overloaded. 1844 QualType OldReturnType = OldType->getResultType(); 1845 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1846 QualType ResQT; 1847 if (OldReturnType != NewReturnType) { 1848 if (NewReturnType->isObjCObjectPointerType() 1849 && OldReturnType->isObjCObjectPointerType()) 1850 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1851 if (ResQT.isNull()) { 1852 if (New->isCXXClassMember() && New->isOutOfLine()) 1853 Diag(New->getLocation(), 1854 diag::err_member_def_does_not_match_ret_type) << New; 1855 else 1856 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1857 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1858 return true; 1859 } 1860 else 1861 NewQType = ResQT; 1862 } 1863 1864 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1865 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1866 if (OldMethod && NewMethod) { 1867 // Preserve triviality. 1868 NewMethod->setTrivial(OldMethod->isTrivial()); 1869 1870 // MSVC allows explicit template specialization at class scope: 1871 // 2 CXMethodDecls referring to the same function will be injected. 1872 // We don't want a redeclartion error. 1873 bool IsClassScopeExplicitSpecialization = 1874 OldMethod->isFunctionTemplateSpecialization() && 1875 NewMethod->isFunctionTemplateSpecialization(); 1876 bool isFriend = NewMethod->getFriendObjectKind(); 1877 1878 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1879 !IsClassScopeExplicitSpecialization) { 1880 // -- Member function declarations with the same name and the 1881 // same parameter types cannot be overloaded if any of them 1882 // is a static member function declaration. 1883 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1884 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1885 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1886 return true; 1887 } 1888 1889 // C++ [class.mem]p1: 1890 // [...] A member shall not be declared twice in the 1891 // member-specification, except that a nested class or member 1892 // class template can be declared and then later defined. 1893 unsigned NewDiag; 1894 if (isa<CXXConstructorDecl>(OldMethod)) 1895 NewDiag = diag::err_constructor_redeclared; 1896 else if (isa<CXXDestructorDecl>(NewMethod)) 1897 NewDiag = diag::err_destructor_redeclared; 1898 else if (isa<CXXConversionDecl>(NewMethod)) 1899 NewDiag = diag::err_conv_function_redeclared; 1900 else 1901 NewDiag = diag::err_member_redeclared; 1902 1903 Diag(New->getLocation(), NewDiag); 1904 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1905 1906 // Complain if this is an explicit declaration of a special 1907 // member that was initially declared implicitly. 1908 // 1909 // As an exception, it's okay to befriend such methods in order 1910 // to permit the implicit constructor/destructor/operator calls. 1911 } else if (OldMethod->isImplicit()) { 1912 if (isFriend) { 1913 NewMethod->setImplicit(); 1914 } else { 1915 Diag(NewMethod->getLocation(), 1916 diag::err_definition_of_implicitly_declared_member) 1917 << New << getSpecialMember(OldMethod); 1918 return true; 1919 } 1920 } else if (OldMethod->isExplicitlyDefaulted()) { 1921 Diag(NewMethod->getLocation(), 1922 diag::err_definition_of_explicitly_defaulted_member) 1923 << getSpecialMember(OldMethod); 1924 return true; 1925 } 1926 } 1927 1928 // (C++98 8.3.5p3): 1929 // All declarations for a function shall agree exactly in both the 1930 // return type and the parameter-type-list. 1931 // We also want to respect all the extended bits except noreturn. 1932 1933 // noreturn should now match unless the old type info didn't have it. 1934 QualType OldQTypeForComparison = OldQType; 1935 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1936 assert(OldQType == QualType(OldType, 0)); 1937 const FunctionType *OldTypeForComparison 1938 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1939 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1940 assert(OldQTypeForComparison.isCanonical()); 1941 } 1942 1943 if (OldQTypeForComparison == NewQType) 1944 return MergeCompatibleFunctionDecls(New, Old); 1945 1946 // Fall through for conflicting redeclarations and redefinitions. 1947 } 1948 1949 // C: Function types need to be compatible, not identical. This handles 1950 // duplicate function decls like "void f(int); void f(enum X);" properly. 1951 if (!getLangOptions().CPlusPlus && 1952 Context.typesAreCompatible(OldQType, NewQType)) { 1953 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1954 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1955 const FunctionProtoType *OldProto = 0; 1956 if (isa<FunctionNoProtoType>(NewFuncType) && 1957 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1958 // The old declaration provided a function prototype, but the 1959 // new declaration does not. Merge in the prototype. 1960 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1961 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1962 OldProto->arg_type_end()); 1963 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1964 ParamTypes.data(), ParamTypes.size(), 1965 OldProto->getExtProtoInfo()); 1966 New->setType(NewQType); 1967 New->setHasInheritedPrototype(); 1968 1969 // Synthesize a parameter for each argument type. 1970 SmallVector<ParmVarDecl*, 16> Params; 1971 for (FunctionProtoType::arg_type_iterator 1972 ParamType = OldProto->arg_type_begin(), 1973 ParamEnd = OldProto->arg_type_end(); 1974 ParamType != ParamEnd; ++ParamType) { 1975 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1976 SourceLocation(), 1977 SourceLocation(), 0, 1978 *ParamType, /*TInfo=*/0, 1979 SC_None, SC_None, 1980 0); 1981 Param->setScopeInfo(0, Params.size()); 1982 Param->setImplicit(); 1983 Params.push_back(Param); 1984 } 1985 1986 New->setParams(Params); 1987 } 1988 1989 return MergeCompatibleFunctionDecls(New, Old); 1990 } 1991 1992 // GNU C permits a K&R definition to follow a prototype declaration 1993 // if the declared types of the parameters in the K&R definition 1994 // match the types in the prototype declaration, even when the 1995 // promoted types of the parameters from the K&R definition differ 1996 // from the types in the prototype. GCC then keeps the types from 1997 // the prototype. 1998 // 1999 // If a variadic prototype is followed by a non-variadic K&R definition, 2000 // the K&R definition becomes variadic. This is sort of an edge case, but 2001 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 2002 // C99 6.9.1p8. 2003 if (!getLangOptions().CPlusPlus && 2004 Old->hasPrototype() && !New->hasPrototype() && 2005 New->getType()->getAs<FunctionProtoType>() && 2006 Old->getNumParams() == New->getNumParams()) { 2007 SmallVector<QualType, 16> ArgTypes; 2008 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 2009 const FunctionProtoType *OldProto 2010 = Old->getType()->getAs<FunctionProtoType>(); 2011 const FunctionProtoType *NewProto 2012 = New->getType()->getAs<FunctionProtoType>(); 2013 2014 // Determine whether this is the GNU C extension. 2015 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 2016 NewProto->getResultType()); 2017 bool LooseCompatible = !MergedReturn.isNull(); 2018 for (unsigned Idx = 0, End = Old->getNumParams(); 2019 LooseCompatible && Idx != End; ++Idx) { 2020 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 2021 ParmVarDecl *NewParm = New->getParamDecl(Idx); 2022 if (Context.typesAreCompatible(OldParm->getType(), 2023 NewProto->getArgType(Idx))) { 2024 ArgTypes.push_back(NewParm->getType()); 2025 } else if (Context.typesAreCompatible(OldParm->getType(), 2026 NewParm->getType(), 2027 /*CompareUnqualified=*/true)) { 2028 GNUCompatibleParamWarning Warn 2029 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 2030 Warnings.push_back(Warn); 2031 ArgTypes.push_back(NewParm->getType()); 2032 } else 2033 LooseCompatible = false; 2034 } 2035 2036 if (LooseCompatible) { 2037 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 2038 Diag(Warnings[Warn].NewParm->getLocation(), 2039 diag::ext_param_promoted_not_compatible_with_prototype) 2040 << Warnings[Warn].PromotedType 2041 << Warnings[Warn].OldParm->getType(); 2042 if (Warnings[Warn].OldParm->getLocation().isValid()) 2043 Diag(Warnings[Warn].OldParm->getLocation(), 2044 diag::note_previous_declaration); 2045 } 2046 2047 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 2048 ArgTypes.size(), 2049 OldProto->getExtProtoInfo())); 2050 return MergeCompatibleFunctionDecls(New, Old); 2051 } 2052 2053 // Fall through to diagnose conflicting types. 2054 } 2055 2056 // A function that has already been declared has been redeclared or defined 2057 // with a different type- show appropriate diagnostic 2058 if (unsigned BuiltinID = Old->getBuiltinID()) { 2059 // The user has declared a builtin function with an incompatible 2060 // signature. 2061 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2062 // The function the user is redeclaring is a library-defined 2063 // function like 'malloc' or 'printf'. Warn about the 2064 // redeclaration, then pretend that we don't know about this 2065 // library built-in. 2066 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2067 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2068 << Old << Old->getType(); 2069 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2070 Old->setInvalidDecl(); 2071 return false; 2072 } 2073 2074 PrevDiag = diag::note_previous_builtin_declaration; 2075 } 2076 2077 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2078 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2079 return true; 2080} 2081 2082/// \brief Completes the merge of two function declarations that are 2083/// known to be compatible. 2084/// 2085/// This routine handles the merging of attributes and other 2086/// properties of function declarations form the old declaration to 2087/// the new declaration, once we know that New is in fact a 2088/// redeclaration of Old. 2089/// 2090/// \returns false 2091bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2092 // Merge the attributes 2093 mergeDeclAttributes(New, Old); 2094 2095 // Merge the storage class. 2096 if (Old->getStorageClass() != SC_Extern && 2097 Old->getStorageClass() != SC_None) 2098 New->setStorageClass(Old->getStorageClass()); 2099 2100 // Merge "pure" flag. 2101 if (Old->isPure()) 2102 New->setPure(); 2103 2104 // Merge attributes from the parameters. These can mismatch with K&R 2105 // declarations. 2106 if (New->getNumParams() == Old->getNumParams()) 2107 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2108 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2109 Context); 2110 2111 if (getLangOptions().CPlusPlus) 2112 return MergeCXXFunctionDecl(New, Old); 2113 2114 return false; 2115} 2116 2117 2118void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2119 ObjCMethodDecl *oldMethod) { 2120 // We don't want to merge unavailable and deprecated attributes 2121 // except from interface to implementation. 2122 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2123 2124 // Merge the attributes. 2125 mergeDeclAttributes(newMethod, oldMethod, mergeDeprecation); 2126 2127 // Merge attributes from the parameters. 2128 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2129 for (ObjCMethodDecl::param_iterator 2130 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2131 ni != ne; ++ni, ++oi) 2132 mergeParamDeclAttributes(*ni, *oi, Context); 2133 2134 CheckObjCMethodOverride(newMethod, oldMethod, true); 2135} 2136 2137/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2138/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2139/// emitting diagnostics as appropriate. 2140/// 2141/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2142/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2143/// check them before the initializer is attached. 2144/// 2145void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2146 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2147 return; 2148 2149 QualType MergedT; 2150 if (getLangOptions().CPlusPlus) { 2151 AutoType *AT = New->getType()->getContainedAutoType(); 2152 if (AT && !AT->isDeduced()) { 2153 // We don't know what the new type is until the initializer is attached. 2154 return; 2155 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2156 // These could still be something that needs exception specs checked. 2157 return MergeVarDeclExceptionSpecs(New, Old); 2158 } 2159 // C++ [basic.link]p10: 2160 // [...] the types specified by all declarations referring to a given 2161 // object or function shall be identical, except that declarations for an 2162 // array object can specify array types that differ by the presence or 2163 // absence of a major array bound (8.3.4). 2164 else if (Old->getType()->isIncompleteArrayType() && 2165 New->getType()->isArrayType()) { 2166 CanQual<ArrayType> OldArray 2167 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2168 CanQual<ArrayType> NewArray 2169 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2170 if (OldArray->getElementType() == NewArray->getElementType()) 2171 MergedT = New->getType(); 2172 } else if (Old->getType()->isArrayType() && 2173 New->getType()->isIncompleteArrayType()) { 2174 CanQual<ArrayType> OldArray 2175 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2176 CanQual<ArrayType> NewArray 2177 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2178 if (OldArray->getElementType() == NewArray->getElementType()) 2179 MergedT = Old->getType(); 2180 } else if (New->getType()->isObjCObjectPointerType() 2181 && Old->getType()->isObjCObjectPointerType()) { 2182 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2183 Old->getType()); 2184 } 2185 } else { 2186 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2187 } 2188 if (MergedT.isNull()) { 2189 Diag(New->getLocation(), diag::err_redefinition_different_type) 2190 << New->getDeclName(); 2191 Diag(Old->getLocation(), diag::note_previous_definition); 2192 return New->setInvalidDecl(); 2193 } 2194 New->setType(MergedT); 2195} 2196 2197/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2198/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2199/// situation, merging decls or emitting diagnostics as appropriate. 2200/// 2201/// Tentative definition rules (C99 6.9.2p2) are checked by 2202/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2203/// definitions here, since the initializer hasn't been attached. 2204/// 2205void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2206 // If the new decl is already invalid, don't do any other checking. 2207 if (New->isInvalidDecl()) 2208 return; 2209 2210 // Verify the old decl was also a variable. 2211 VarDecl *Old = 0; 2212 if (!Previous.isSingleResult() || 2213 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2214 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2215 << New->getDeclName(); 2216 Diag(Previous.getRepresentativeDecl()->getLocation(), 2217 diag::note_previous_definition); 2218 return New->setInvalidDecl(); 2219 } 2220 2221 // C++ [class.mem]p1: 2222 // A member shall not be declared twice in the member-specification [...] 2223 // 2224 // Here, we need only consider static data members. 2225 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2226 Diag(New->getLocation(), diag::err_duplicate_member) 2227 << New->getIdentifier(); 2228 Diag(Old->getLocation(), diag::note_previous_declaration); 2229 New->setInvalidDecl(); 2230 } 2231 2232 mergeDeclAttributes(New, Old); 2233 // Warn if an already-declared variable is made a weak_import in a subsequent 2234 // declaration 2235 if (New->getAttr<WeakImportAttr>() && 2236 Old->getStorageClass() == SC_None && 2237 !Old->getAttr<WeakImportAttr>()) { 2238 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2239 Diag(Old->getLocation(), diag::note_previous_definition); 2240 // Remove weak_import attribute on new declaration. 2241 New->dropAttr<WeakImportAttr>(); 2242 } 2243 2244 // Merge the types. 2245 MergeVarDeclTypes(New, Old); 2246 if (New->isInvalidDecl()) 2247 return; 2248 2249 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2250 if (New->getStorageClass() == SC_Static && 2251 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2252 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2253 Diag(Old->getLocation(), diag::note_previous_definition); 2254 return New->setInvalidDecl(); 2255 } 2256 // C99 6.2.2p4: 2257 // For an identifier declared with the storage-class specifier 2258 // extern in a scope in which a prior declaration of that 2259 // identifier is visible,23) if the prior declaration specifies 2260 // internal or external linkage, the linkage of the identifier at 2261 // the later declaration is the same as the linkage specified at 2262 // the prior declaration. If no prior declaration is visible, or 2263 // if the prior declaration specifies no linkage, then the 2264 // identifier has external linkage. 2265 if (New->hasExternalStorage() && Old->hasLinkage()) 2266 /* Okay */; 2267 else if (New->getStorageClass() != SC_Static && 2268 Old->getStorageClass() == SC_Static) { 2269 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2270 Diag(Old->getLocation(), diag::note_previous_definition); 2271 return New->setInvalidDecl(); 2272 } 2273 2274 // Check if extern is followed by non-extern and vice-versa. 2275 if (New->hasExternalStorage() && 2276 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2277 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2278 Diag(Old->getLocation(), diag::note_previous_definition); 2279 return New->setInvalidDecl(); 2280 } 2281 if (Old->hasExternalStorage() && 2282 !New->hasLinkage() && New->isLocalVarDecl()) { 2283 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2284 Diag(Old->getLocation(), diag::note_previous_definition); 2285 return New->setInvalidDecl(); 2286 } 2287 2288 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2289 2290 // FIXME: The test for external storage here seems wrong? We still 2291 // need to check for mismatches. 2292 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2293 // Don't complain about out-of-line definitions of static members. 2294 !(Old->getLexicalDeclContext()->isRecord() && 2295 !New->getLexicalDeclContext()->isRecord())) { 2296 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2297 Diag(Old->getLocation(), diag::note_previous_definition); 2298 return New->setInvalidDecl(); 2299 } 2300 2301 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2302 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2303 Diag(Old->getLocation(), diag::note_previous_definition); 2304 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2305 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2306 Diag(Old->getLocation(), diag::note_previous_definition); 2307 } 2308 2309 // C++ doesn't have tentative definitions, so go right ahead and check here. 2310 const VarDecl *Def; 2311 if (getLangOptions().CPlusPlus && 2312 New->isThisDeclarationADefinition() == VarDecl::Definition && 2313 (Def = Old->getDefinition())) { 2314 Diag(New->getLocation(), diag::err_redefinition) 2315 << New->getDeclName(); 2316 Diag(Def->getLocation(), diag::note_previous_definition); 2317 New->setInvalidDecl(); 2318 return; 2319 } 2320 // c99 6.2.2 P4. 2321 // For an identifier declared with the storage-class specifier extern in a 2322 // scope in which a prior declaration of that identifier is visible, if 2323 // the prior declaration specifies internal or external linkage, the linkage 2324 // of the identifier at the later declaration is the same as the linkage 2325 // specified at the prior declaration. 2326 // FIXME. revisit this code. 2327 if (New->hasExternalStorage() && 2328 Old->getLinkage() == InternalLinkage && 2329 New->getDeclContext() == Old->getDeclContext()) 2330 New->setStorageClass(Old->getStorageClass()); 2331 2332 // Keep a chain of previous declarations. 2333 New->setPreviousDeclaration(Old); 2334 2335 // Inherit access appropriately. 2336 New->setAccess(Old->getAccess()); 2337} 2338 2339/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2340/// no declarator (e.g. "struct foo;") is parsed. 2341Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2342 DeclSpec &DS) { 2343 return ParsedFreeStandingDeclSpec(S, AS, DS, 2344 MultiTemplateParamsArg(*this, 0, 0)); 2345} 2346 2347/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2348/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2349/// parameters to cope with template friend declarations. 2350Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2351 DeclSpec &DS, 2352 MultiTemplateParamsArg TemplateParams) { 2353 Decl *TagD = 0; 2354 TagDecl *Tag = 0; 2355 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2356 DS.getTypeSpecType() == DeclSpec::TST_struct || 2357 DS.getTypeSpecType() == DeclSpec::TST_union || 2358 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2359 TagD = DS.getRepAsDecl(); 2360 2361 if (!TagD) // We probably had an error 2362 return 0; 2363 2364 // Note that the above type specs guarantee that the 2365 // type rep is a Decl, whereas in many of the others 2366 // it's a Type. 2367 if (isa<TagDecl>(TagD)) 2368 Tag = cast<TagDecl>(TagD); 2369 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2370 Tag = CTD->getTemplatedDecl(); 2371 } 2372 2373 if (Tag) 2374 Tag->setFreeStanding(); 2375 2376 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2377 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2378 // or incomplete types shall not be restrict-qualified." 2379 if (TypeQuals & DeclSpec::TQ_restrict) 2380 Diag(DS.getRestrictSpecLoc(), 2381 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2382 << DS.getSourceRange(); 2383 } 2384 2385 if (DS.isConstexprSpecified()) { 2386 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2387 // and definitions of functions and variables. 2388 if (Tag) 2389 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2390 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2391 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2392 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2393 else 2394 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2395 // Don't emit warnings after this error. 2396 return TagD; 2397 } 2398 2399 if (DS.isFriendSpecified()) { 2400 // If we're dealing with a decl but not a TagDecl, assume that 2401 // whatever routines created it handled the friendship aspect. 2402 if (TagD && !Tag) 2403 return 0; 2404 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2405 } 2406 2407 // Track whether we warned about the fact that there aren't any 2408 // declarators. 2409 bool emittedWarning = false; 2410 2411 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2412 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2413 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2414 if (getLangOptions().CPlusPlus || 2415 Record->getDeclContext()->isRecord()) 2416 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2417 2418 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2419 << DS.getSourceRange(); 2420 emittedWarning = true; 2421 } 2422 } 2423 2424 // Check for Microsoft C extension: anonymous struct. 2425 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2426 CurContext->isRecord() && 2427 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2428 // Handle 2 kinds of anonymous struct: 2429 // struct STRUCT; 2430 // and 2431 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2432 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2433 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2434 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2435 DS.getRepAsType().get()->isStructureType())) { 2436 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2437 << DS.getSourceRange(); 2438 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2439 } 2440 } 2441 2442 if (getLangOptions().CPlusPlus && 2443 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2444 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2445 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2446 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2447 Diag(Enum->getLocation(), diag::ext_no_declarators) 2448 << DS.getSourceRange(); 2449 emittedWarning = true; 2450 } 2451 2452 // Skip all the checks below if we have a type error. 2453 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2454 2455 if (!DS.isMissingDeclaratorOk()) { 2456 // Warn about typedefs of enums without names, since this is an 2457 // extension in both Microsoft and GNU. 2458 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2459 Tag && isa<EnumDecl>(Tag)) { 2460 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2461 << DS.getSourceRange(); 2462 return Tag; 2463 } 2464 2465 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2466 << DS.getSourceRange(); 2467 emittedWarning = true; 2468 } 2469 2470 // We're going to complain about a bunch of spurious specifiers; 2471 // only do this if we're declaring a tag, because otherwise we 2472 // should be getting diag::ext_no_declarators. 2473 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2474 return TagD; 2475 2476 // Note that a linkage-specification sets a storage class, but 2477 // 'extern "C" struct foo;' is actually valid and not theoretically 2478 // useless. 2479 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2480 if (!DS.isExternInLinkageSpec()) 2481 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2482 << DeclSpec::getSpecifierName(scs); 2483 2484 if (DS.isThreadSpecified()) 2485 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2486 if (DS.getTypeQualifiers()) { 2487 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2488 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2489 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2490 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2491 // Restrict is covered above. 2492 } 2493 if (DS.isInlineSpecified()) 2494 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2495 if (DS.isVirtualSpecified()) 2496 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2497 if (DS.isExplicitSpecified()) 2498 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2499 2500 if (DS.isModulePrivateSpecified() && 2501 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2502 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2503 << Tag->getTagKind() 2504 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2505 2506 // Warn about ignored type attributes, for example: 2507 // __attribute__((aligned)) struct A; 2508 // Attributes should be placed after tag to apply to type declaration. 2509 if (!DS.getAttributes().empty()) { 2510 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2511 if (TypeSpecType == DeclSpec::TST_class || 2512 TypeSpecType == DeclSpec::TST_struct || 2513 TypeSpecType == DeclSpec::TST_union || 2514 TypeSpecType == DeclSpec::TST_enum) { 2515 AttributeList* attrs = DS.getAttributes().getList(); 2516 while (attrs) { 2517 Diag(attrs->getScopeLoc(), 2518 diag::warn_declspec_attribute_ignored) 2519 << attrs->getName() 2520 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2521 TypeSpecType == DeclSpec::TST_struct ? 1 : 2522 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2523 attrs = attrs->getNext(); 2524 } 2525 } 2526 } 2527 2528 return TagD; 2529} 2530 2531/// We are trying to inject an anonymous member into the given scope; 2532/// check if there's an existing declaration that can't be overloaded. 2533/// 2534/// \return true if this is a forbidden redeclaration 2535static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2536 Scope *S, 2537 DeclContext *Owner, 2538 DeclarationName Name, 2539 SourceLocation NameLoc, 2540 unsigned diagnostic) { 2541 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2542 Sema::ForRedeclaration); 2543 if (!SemaRef.LookupName(R, S)) return false; 2544 2545 if (R.getAsSingle<TagDecl>()) 2546 return false; 2547 2548 // Pick a representative declaration. 2549 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2550 assert(PrevDecl && "Expected a non-null Decl"); 2551 2552 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2553 return false; 2554 2555 SemaRef.Diag(NameLoc, diagnostic) << Name; 2556 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2557 2558 return true; 2559} 2560 2561/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2562/// anonymous struct or union AnonRecord into the owning context Owner 2563/// and scope S. This routine will be invoked just after we realize 2564/// that an unnamed union or struct is actually an anonymous union or 2565/// struct, e.g., 2566/// 2567/// @code 2568/// union { 2569/// int i; 2570/// float f; 2571/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2572/// // f into the surrounding scope.x 2573/// @endcode 2574/// 2575/// This routine is recursive, injecting the names of nested anonymous 2576/// structs/unions into the owning context and scope as well. 2577static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2578 DeclContext *Owner, 2579 RecordDecl *AnonRecord, 2580 AccessSpecifier AS, 2581 SmallVector<NamedDecl*, 2> &Chaining, 2582 bool MSAnonStruct) { 2583 unsigned diagKind 2584 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2585 : diag::err_anonymous_struct_member_redecl; 2586 2587 bool Invalid = false; 2588 2589 // Look every FieldDecl and IndirectFieldDecl with a name. 2590 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2591 DEnd = AnonRecord->decls_end(); 2592 D != DEnd; ++D) { 2593 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2594 cast<NamedDecl>(*D)->getDeclName()) { 2595 ValueDecl *VD = cast<ValueDecl>(*D); 2596 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2597 VD->getLocation(), diagKind)) { 2598 // C++ [class.union]p2: 2599 // The names of the members of an anonymous union shall be 2600 // distinct from the names of any other entity in the 2601 // scope in which the anonymous union is declared. 2602 Invalid = true; 2603 } else { 2604 // C++ [class.union]p2: 2605 // For the purpose of name lookup, after the anonymous union 2606 // definition, the members of the anonymous union are 2607 // considered to have been defined in the scope in which the 2608 // anonymous union is declared. 2609 unsigned OldChainingSize = Chaining.size(); 2610 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2611 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2612 PE = IF->chain_end(); PI != PE; ++PI) 2613 Chaining.push_back(*PI); 2614 else 2615 Chaining.push_back(VD); 2616 2617 assert(Chaining.size() >= 2); 2618 NamedDecl **NamedChain = 2619 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2620 for (unsigned i = 0; i < Chaining.size(); i++) 2621 NamedChain[i] = Chaining[i]; 2622 2623 IndirectFieldDecl* IndirectField = 2624 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2625 VD->getIdentifier(), VD->getType(), 2626 NamedChain, Chaining.size()); 2627 2628 IndirectField->setAccess(AS); 2629 IndirectField->setImplicit(); 2630 SemaRef.PushOnScopeChains(IndirectField, S); 2631 2632 // That includes picking up the appropriate access specifier. 2633 if (AS != AS_none) IndirectField->setAccess(AS); 2634 2635 Chaining.resize(OldChainingSize); 2636 } 2637 } 2638 } 2639 2640 return Invalid; 2641} 2642 2643/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2644/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2645/// illegal input values are mapped to SC_None. 2646static StorageClass 2647StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2648 switch (StorageClassSpec) { 2649 case DeclSpec::SCS_unspecified: return SC_None; 2650 case DeclSpec::SCS_extern: return SC_Extern; 2651 case DeclSpec::SCS_static: return SC_Static; 2652 case DeclSpec::SCS_auto: return SC_Auto; 2653 case DeclSpec::SCS_register: return SC_Register; 2654 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2655 // Illegal SCSs map to None: error reporting is up to the caller. 2656 case DeclSpec::SCS_mutable: // Fall through. 2657 case DeclSpec::SCS_typedef: return SC_None; 2658 } 2659 llvm_unreachable("unknown storage class specifier"); 2660} 2661 2662/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2663/// a StorageClass. Any error reporting is up to the caller: 2664/// illegal input values are mapped to SC_None. 2665static StorageClass 2666StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2667 switch (StorageClassSpec) { 2668 case DeclSpec::SCS_unspecified: return SC_None; 2669 case DeclSpec::SCS_extern: return SC_Extern; 2670 case DeclSpec::SCS_static: return SC_Static; 2671 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2672 // Illegal SCSs map to None: error reporting is up to the caller. 2673 case DeclSpec::SCS_auto: // Fall through. 2674 case DeclSpec::SCS_mutable: // Fall through. 2675 case DeclSpec::SCS_register: // Fall through. 2676 case DeclSpec::SCS_typedef: return SC_None; 2677 } 2678 llvm_unreachable("unknown storage class specifier"); 2679} 2680 2681/// BuildAnonymousStructOrUnion - Handle the declaration of an 2682/// anonymous structure or union. Anonymous unions are a C++ feature 2683/// (C++ [class.union]) and a C11 feature; anonymous structures 2684/// are a C11 feature and GNU C++ extension. 2685Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2686 AccessSpecifier AS, 2687 RecordDecl *Record) { 2688 DeclContext *Owner = Record->getDeclContext(); 2689 2690 // Diagnose whether this anonymous struct/union is an extension. 2691 if (Record->isUnion() && !getLangOptions().CPlusPlus && !getLangOptions().C11) 2692 Diag(Record->getLocation(), diag::ext_anonymous_union); 2693 else if (!Record->isUnion() && getLangOptions().CPlusPlus) 2694 Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct); 2695 else if (!Record->isUnion() && !getLangOptions().C11) 2696 Diag(Record->getLocation(), diag::ext_c11_anonymous_struct); 2697 2698 // C and C++ require different kinds of checks for anonymous 2699 // structs/unions. 2700 bool Invalid = false; 2701 if (getLangOptions().CPlusPlus) { 2702 const char* PrevSpec = 0; 2703 unsigned DiagID; 2704 if (Record->isUnion()) { 2705 // C++ [class.union]p6: 2706 // Anonymous unions declared in a named namespace or in the 2707 // global namespace shall be declared static. 2708 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2709 (isa<TranslationUnitDecl>(Owner) || 2710 (isa<NamespaceDecl>(Owner) && 2711 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2712 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2713 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2714 2715 // Recover by adding 'static'. 2716 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2717 PrevSpec, DiagID); 2718 } 2719 // C++ [class.union]p6: 2720 // A storage class is not allowed in a declaration of an 2721 // anonymous union in a class scope. 2722 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2723 isa<RecordDecl>(Owner)) { 2724 Diag(DS.getStorageClassSpecLoc(), 2725 diag::err_anonymous_union_with_storage_spec) 2726 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2727 2728 // Recover by removing the storage specifier. 2729 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2730 SourceLocation(), 2731 PrevSpec, DiagID); 2732 } 2733 } 2734 2735 // Ignore const/volatile/restrict qualifiers. 2736 if (DS.getTypeQualifiers()) { 2737 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2738 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2739 << Record->isUnion() << 0 2740 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2741 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2742 Diag(DS.getVolatileSpecLoc(), 2743 diag::ext_anonymous_struct_union_qualified) 2744 << Record->isUnion() << 1 2745 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2746 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2747 Diag(DS.getRestrictSpecLoc(), 2748 diag::ext_anonymous_struct_union_qualified) 2749 << Record->isUnion() << 2 2750 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2751 2752 DS.ClearTypeQualifiers(); 2753 } 2754 2755 // C++ [class.union]p2: 2756 // The member-specification of an anonymous union shall only 2757 // define non-static data members. [Note: nested types and 2758 // functions cannot be declared within an anonymous union. ] 2759 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2760 MemEnd = Record->decls_end(); 2761 Mem != MemEnd; ++Mem) { 2762 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2763 // C++ [class.union]p3: 2764 // An anonymous union shall not have private or protected 2765 // members (clause 11). 2766 assert(FD->getAccess() != AS_none); 2767 if (FD->getAccess() != AS_public) { 2768 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2769 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2770 Invalid = true; 2771 } 2772 2773 // C++ [class.union]p1 2774 // An object of a class with a non-trivial constructor, a non-trivial 2775 // copy constructor, a non-trivial destructor, or a non-trivial copy 2776 // assignment operator cannot be a member of a union, nor can an 2777 // array of such objects. 2778 if (CheckNontrivialField(FD)) 2779 Invalid = true; 2780 } else if ((*Mem)->isImplicit()) { 2781 // Any implicit members are fine. 2782 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2783 // This is a type that showed up in an 2784 // elaborated-type-specifier inside the anonymous struct or 2785 // union, but which actually declares a type outside of the 2786 // anonymous struct or union. It's okay. 2787 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2788 if (!MemRecord->isAnonymousStructOrUnion() && 2789 MemRecord->getDeclName()) { 2790 // Visual C++ allows type definition in anonymous struct or union. 2791 if (getLangOptions().MicrosoftExt) 2792 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2793 << (int)Record->isUnion(); 2794 else { 2795 // This is a nested type declaration. 2796 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2797 << (int)Record->isUnion(); 2798 Invalid = true; 2799 } 2800 } 2801 } else if (isa<AccessSpecDecl>(*Mem)) { 2802 // Any access specifier is fine. 2803 } else { 2804 // We have something that isn't a non-static data 2805 // member. Complain about it. 2806 unsigned DK = diag::err_anonymous_record_bad_member; 2807 if (isa<TypeDecl>(*Mem)) 2808 DK = diag::err_anonymous_record_with_type; 2809 else if (isa<FunctionDecl>(*Mem)) 2810 DK = diag::err_anonymous_record_with_function; 2811 else if (isa<VarDecl>(*Mem)) 2812 DK = diag::err_anonymous_record_with_static; 2813 2814 // Visual C++ allows type definition in anonymous struct or union. 2815 if (getLangOptions().MicrosoftExt && 2816 DK == diag::err_anonymous_record_with_type) 2817 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2818 << (int)Record->isUnion(); 2819 else { 2820 Diag((*Mem)->getLocation(), DK) 2821 << (int)Record->isUnion(); 2822 Invalid = true; 2823 } 2824 } 2825 } 2826 } 2827 2828 if (!Record->isUnion() && !Owner->isRecord()) { 2829 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2830 << (int)getLangOptions().CPlusPlus; 2831 Invalid = true; 2832 } 2833 2834 // Mock up a declarator. 2835 Declarator Dc(DS, Declarator::MemberContext); 2836 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2837 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2838 2839 // Create a declaration for this anonymous struct/union. 2840 NamedDecl *Anon = 0; 2841 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2842 Anon = FieldDecl::Create(Context, OwningClass, 2843 DS.getSourceRange().getBegin(), 2844 Record->getLocation(), 2845 /*IdentifierInfo=*/0, 2846 Context.getTypeDeclType(Record), 2847 TInfo, 2848 /*BitWidth=*/0, /*Mutable=*/false, 2849 /*HasInit=*/false); 2850 Anon->setAccess(AS); 2851 if (getLangOptions().CPlusPlus) 2852 FieldCollector->Add(cast<FieldDecl>(Anon)); 2853 } else { 2854 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2855 assert(SCSpec != DeclSpec::SCS_typedef && 2856 "Parser allowed 'typedef' as storage class VarDecl."); 2857 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2858 if (SCSpec == DeclSpec::SCS_mutable) { 2859 // mutable can only appear on non-static class members, so it's always 2860 // an error here 2861 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2862 Invalid = true; 2863 SC = SC_None; 2864 } 2865 SCSpec = DS.getStorageClassSpecAsWritten(); 2866 VarDecl::StorageClass SCAsWritten 2867 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2868 2869 Anon = VarDecl::Create(Context, Owner, 2870 DS.getSourceRange().getBegin(), 2871 Record->getLocation(), /*IdentifierInfo=*/0, 2872 Context.getTypeDeclType(Record), 2873 TInfo, SC, SCAsWritten); 2874 2875 // Default-initialize the implicit variable. This initialization will be 2876 // trivial in almost all cases, except if a union member has an in-class 2877 // initializer: 2878 // union { int n = 0; }; 2879 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2880 } 2881 Anon->setImplicit(); 2882 2883 // Add the anonymous struct/union object to the current 2884 // context. We'll be referencing this object when we refer to one of 2885 // its members. 2886 Owner->addDecl(Anon); 2887 2888 // Inject the members of the anonymous struct/union into the owning 2889 // context and into the identifier resolver chain for name lookup 2890 // purposes. 2891 SmallVector<NamedDecl*, 2> Chain; 2892 Chain.push_back(Anon); 2893 2894 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2895 Chain, false)) 2896 Invalid = true; 2897 2898 // Mark this as an anonymous struct/union type. Note that we do not 2899 // do this until after we have already checked and injected the 2900 // members of this anonymous struct/union type, because otherwise 2901 // the members could be injected twice: once by DeclContext when it 2902 // builds its lookup table, and once by 2903 // InjectAnonymousStructOrUnionMembers. 2904 Record->setAnonymousStructOrUnion(true); 2905 2906 if (Invalid) 2907 Anon->setInvalidDecl(); 2908 2909 return Anon; 2910} 2911 2912/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2913/// Microsoft C anonymous structure. 2914/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2915/// Example: 2916/// 2917/// struct A { int a; }; 2918/// struct B { struct A; int b; }; 2919/// 2920/// void foo() { 2921/// B var; 2922/// var.a = 3; 2923/// } 2924/// 2925Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2926 RecordDecl *Record) { 2927 2928 // If there is no Record, get the record via the typedef. 2929 if (!Record) 2930 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2931 2932 // Mock up a declarator. 2933 Declarator Dc(DS, Declarator::TypeNameContext); 2934 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2935 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2936 2937 // Create a declaration for this anonymous struct. 2938 NamedDecl* Anon = FieldDecl::Create(Context, 2939 cast<RecordDecl>(CurContext), 2940 DS.getSourceRange().getBegin(), 2941 DS.getSourceRange().getBegin(), 2942 /*IdentifierInfo=*/0, 2943 Context.getTypeDeclType(Record), 2944 TInfo, 2945 /*BitWidth=*/0, /*Mutable=*/false, 2946 /*HasInit=*/false); 2947 Anon->setImplicit(); 2948 2949 // Add the anonymous struct object to the current context. 2950 CurContext->addDecl(Anon); 2951 2952 // Inject the members of the anonymous struct into the current 2953 // context and into the identifier resolver chain for name lookup 2954 // purposes. 2955 SmallVector<NamedDecl*, 2> Chain; 2956 Chain.push_back(Anon); 2957 2958 RecordDecl *RecordDef = Record->getDefinition(); 2959 if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2960 RecordDef, AS_none, 2961 Chain, true)) 2962 Anon->setInvalidDecl(); 2963 2964 return Anon; 2965} 2966 2967/// GetNameForDeclarator - Determine the full declaration name for the 2968/// given Declarator. 2969DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2970 return GetNameFromUnqualifiedId(D.getName()); 2971} 2972 2973/// \brief Retrieves the declaration name from a parsed unqualified-id. 2974DeclarationNameInfo 2975Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2976 DeclarationNameInfo NameInfo; 2977 NameInfo.setLoc(Name.StartLocation); 2978 2979 switch (Name.getKind()) { 2980 2981 case UnqualifiedId::IK_ImplicitSelfParam: 2982 case UnqualifiedId::IK_Identifier: 2983 NameInfo.setName(Name.Identifier); 2984 NameInfo.setLoc(Name.StartLocation); 2985 return NameInfo; 2986 2987 case UnqualifiedId::IK_OperatorFunctionId: 2988 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2989 Name.OperatorFunctionId.Operator)); 2990 NameInfo.setLoc(Name.StartLocation); 2991 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2992 = Name.OperatorFunctionId.SymbolLocations[0]; 2993 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2994 = Name.EndLocation.getRawEncoding(); 2995 return NameInfo; 2996 2997 case UnqualifiedId::IK_LiteralOperatorId: 2998 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2999 Name.Identifier)); 3000 NameInfo.setLoc(Name.StartLocation); 3001 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 3002 return NameInfo; 3003 3004 case UnqualifiedId::IK_ConversionFunctionId: { 3005 TypeSourceInfo *TInfo; 3006 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 3007 if (Ty.isNull()) 3008 return DeclarationNameInfo(); 3009 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 3010 Context.getCanonicalType(Ty))); 3011 NameInfo.setLoc(Name.StartLocation); 3012 NameInfo.setNamedTypeInfo(TInfo); 3013 return NameInfo; 3014 } 3015 3016 case UnqualifiedId::IK_ConstructorName: { 3017 TypeSourceInfo *TInfo; 3018 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 3019 if (Ty.isNull()) 3020 return DeclarationNameInfo(); 3021 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3022 Context.getCanonicalType(Ty))); 3023 NameInfo.setLoc(Name.StartLocation); 3024 NameInfo.setNamedTypeInfo(TInfo); 3025 return NameInfo; 3026 } 3027 3028 case UnqualifiedId::IK_ConstructorTemplateId: { 3029 // In well-formed code, we can only have a constructor 3030 // template-id that refers to the current context, so go there 3031 // to find the actual type being constructed. 3032 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 3033 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 3034 return DeclarationNameInfo(); 3035 3036 // Determine the type of the class being constructed. 3037 QualType CurClassType = Context.getTypeDeclType(CurClass); 3038 3039 // FIXME: Check two things: that the template-id names the same type as 3040 // CurClassType, and that the template-id does not occur when the name 3041 // was qualified. 3042 3043 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3044 Context.getCanonicalType(CurClassType))); 3045 NameInfo.setLoc(Name.StartLocation); 3046 // FIXME: should we retrieve TypeSourceInfo? 3047 NameInfo.setNamedTypeInfo(0); 3048 return NameInfo; 3049 } 3050 3051 case UnqualifiedId::IK_DestructorName: { 3052 TypeSourceInfo *TInfo; 3053 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3054 if (Ty.isNull()) 3055 return DeclarationNameInfo(); 3056 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3057 Context.getCanonicalType(Ty))); 3058 NameInfo.setLoc(Name.StartLocation); 3059 NameInfo.setNamedTypeInfo(TInfo); 3060 return NameInfo; 3061 } 3062 3063 case UnqualifiedId::IK_TemplateId: { 3064 TemplateName TName = Name.TemplateId->Template.get(); 3065 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3066 return Context.getNameForTemplate(TName, TNameLoc); 3067 } 3068 3069 } // switch (Name.getKind()) 3070 3071 llvm_unreachable("Unknown name kind"); 3072} 3073 3074static QualType getCoreType(QualType Ty) { 3075 do { 3076 if (Ty->isPointerType() || Ty->isReferenceType()) 3077 Ty = Ty->getPointeeType(); 3078 else if (Ty->isArrayType()) 3079 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3080 else 3081 return Ty.withoutLocalFastQualifiers(); 3082 } while (true); 3083} 3084 3085/// hasSimilarParameters - Determine whether the C++ functions Declaration 3086/// and Definition have "nearly" matching parameters. This heuristic is 3087/// used to improve diagnostics in the case where an out-of-line function 3088/// definition doesn't match any declaration within the class or namespace. 3089/// Also sets Params to the list of indices to the parameters that differ 3090/// between the declaration and the definition. If hasSimilarParameters 3091/// returns true and Params is empty, then all of the parameters match. 3092static bool hasSimilarParameters(ASTContext &Context, 3093 FunctionDecl *Declaration, 3094 FunctionDecl *Definition, 3095 llvm::SmallVectorImpl<unsigned> &Params) { 3096 Params.clear(); 3097 if (Declaration->param_size() != Definition->param_size()) 3098 return false; 3099 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3100 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3101 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3102 3103 // The parameter types are identical 3104 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3105 continue; 3106 3107 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3108 QualType DefParamBaseTy = getCoreType(DefParamTy); 3109 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3110 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3111 3112 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3113 (DeclTyName && DeclTyName == DefTyName)) 3114 Params.push_back(Idx); 3115 else // The two parameters aren't even close 3116 return false; 3117 } 3118 3119 return true; 3120} 3121 3122/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3123/// declarator needs to be rebuilt in the current instantiation. 3124/// Any bits of declarator which appear before the name are valid for 3125/// consideration here. That's specifically the type in the decl spec 3126/// and the base type in any member-pointer chunks. 3127static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3128 DeclarationName Name) { 3129 // The types we specifically need to rebuild are: 3130 // - typenames, typeofs, and decltypes 3131 // - types which will become injected class names 3132 // Of course, we also need to rebuild any type referencing such a 3133 // type. It's safest to just say "dependent", but we call out a 3134 // few cases here. 3135 3136 DeclSpec &DS = D.getMutableDeclSpec(); 3137 switch (DS.getTypeSpecType()) { 3138 case DeclSpec::TST_typename: 3139 case DeclSpec::TST_typeofType: 3140 case DeclSpec::TST_decltype: 3141 case DeclSpec::TST_underlyingType: 3142 case DeclSpec::TST_atomic: { 3143 // Grab the type from the parser. 3144 TypeSourceInfo *TSI = 0; 3145 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3146 if (T.isNull() || !T->isDependentType()) break; 3147 3148 // Make sure there's a type source info. This isn't really much 3149 // of a waste; most dependent types should have type source info 3150 // attached already. 3151 if (!TSI) 3152 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3153 3154 // Rebuild the type in the current instantiation. 3155 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3156 if (!TSI) return true; 3157 3158 // Store the new type back in the decl spec. 3159 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3160 DS.UpdateTypeRep(LocType); 3161 break; 3162 } 3163 3164 case DeclSpec::TST_typeofExpr: { 3165 Expr *E = DS.getRepAsExpr(); 3166 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3167 if (Result.isInvalid()) return true; 3168 DS.UpdateExprRep(Result.get()); 3169 break; 3170 } 3171 3172 default: 3173 // Nothing to do for these decl specs. 3174 break; 3175 } 3176 3177 // It doesn't matter what order we do this in. 3178 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3179 DeclaratorChunk &Chunk = D.getTypeObject(I); 3180 3181 // The only type information in the declarator which can come 3182 // before the declaration name is the base type of a member 3183 // pointer. 3184 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3185 continue; 3186 3187 // Rebuild the scope specifier in-place. 3188 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3189 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3190 return true; 3191 } 3192 3193 return false; 3194} 3195 3196Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3197 D.setFunctionDefinitionKind(FDK_Declaration); 3198 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3199 3200 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3201 Dcl->getDeclContext()->isFileContext()) 3202 Dcl->setTopLevelDeclInObjCContainer(); 3203 3204 return Dcl; 3205} 3206 3207/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3208/// If T is the name of a class, then each of the following shall have a 3209/// name different from T: 3210/// - every static data member of class T; 3211/// - every member function of class T 3212/// - every member of class T that is itself a type; 3213/// \returns true if the declaration name violates these rules. 3214bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3215 DeclarationNameInfo NameInfo) { 3216 DeclarationName Name = NameInfo.getName(); 3217 3218 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3219 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3220 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3221 return true; 3222 } 3223 3224 return false; 3225} 3226 3227Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3228 MultiTemplateParamsArg TemplateParamLists) { 3229 // TODO: consider using NameInfo for diagnostic. 3230 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3231 DeclarationName Name = NameInfo.getName(); 3232 3233 // All of these full declarators require an identifier. If it doesn't have 3234 // one, the ParsedFreeStandingDeclSpec action should be used. 3235 if (!Name) { 3236 if (!D.isInvalidType()) // Reject this if we think it is valid. 3237 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3238 diag::err_declarator_need_ident) 3239 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3240 return 0; 3241 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3242 return 0; 3243 3244 // The scope passed in may not be a decl scope. Zip up the scope tree until 3245 // we find one that is. 3246 while ((S->getFlags() & Scope::DeclScope) == 0 || 3247 (S->getFlags() & Scope::TemplateParamScope) != 0) 3248 S = S->getParent(); 3249 3250 DeclContext *DC = CurContext; 3251 if (D.getCXXScopeSpec().isInvalid()) 3252 D.setInvalidType(); 3253 else if (D.getCXXScopeSpec().isSet()) { 3254 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3255 UPPC_DeclarationQualifier)) 3256 return 0; 3257 3258 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3259 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3260 if (!DC) { 3261 // If we could not compute the declaration context, it's because the 3262 // declaration context is dependent but does not refer to a class, 3263 // class template, or class template partial specialization. Complain 3264 // and return early, to avoid the coming semantic disaster. 3265 Diag(D.getIdentifierLoc(), 3266 diag::err_template_qualified_declarator_no_match) 3267 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3268 << D.getCXXScopeSpec().getRange(); 3269 return 0; 3270 } 3271 bool IsDependentContext = DC->isDependentContext(); 3272 3273 if (!IsDependentContext && 3274 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3275 return 0; 3276 3277 if (isa<CXXRecordDecl>(DC)) { 3278 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3279 Diag(D.getIdentifierLoc(), 3280 diag::err_member_def_undefined_record) 3281 << Name << DC << D.getCXXScopeSpec().getRange(); 3282 D.setInvalidType(); 3283 } else if (isa<CXXRecordDecl>(CurContext) && 3284 !D.getDeclSpec().isFriendSpecified()) { 3285 // The user provided a superfluous scope specifier inside a class 3286 // definition: 3287 // 3288 // class X { 3289 // void X::f(); 3290 // }; 3291 if (CurContext->Equals(DC)) { 3292 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3293 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3294 } else { 3295 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3296 << Name << D.getCXXScopeSpec().getRange(); 3297 3298 // C++ constructors and destructors with incorrect scopes can break 3299 // our AST invariants by having the wrong underlying types. If 3300 // that's the case, then drop this declaration entirely. 3301 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3302 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3303 !Context.hasSameType(Name.getCXXNameType(), 3304 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)))) 3305 return 0; 3306 } 3307 3308 // Pretend that this qualifier was not here. 3309 D.getCXXScopeSpec().clear(); 3310 } 3311 } 3312 3313 // Check whether we need to rebuild the type of the given 3314 // declaration in the current instantiation. 3315 if (EnteringContext && IsDependentContext && 3316 TemplateParamLists.size() != 0) { 3317 ContextRAII SavedContext(*this, DC); 3318 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3319 D.setInvalidType(); 3320 } 3321 } 3322 3323 if (DiagnoseClassNameShadow(DC, NameInfo)) 3324 // If this is a typedef, we'll end up spewing multiple diagnostics. 3325 // Just return early; it's safer. 3326 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3327 return 0; 3328 3329 NamedDecl *New; 3330 3331 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3332 QualType R = TInfo->getType(); 3333 3334 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3335 UPPC_DeclarationType)) 3336 D.setInvalidType(); 3337 3338 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3339 ForRedeclaration); 3340 3341 // See if this is a redefinition of a variable in the same scope. 3342 if (!D.getCXXScopeSpec().isSet()) { 3343 bool IsLinkageLookup = false; 3344 3345 // If the declaration we're planning to build will be a function 3346 // or object with linkage, then look for another declaration with 3347 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3348 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3349 /* Do nothing*/; 3350 else if (R->isFunctionType()) { 3351 if (CurContext->isFunctionOrMethod() || 3352 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3353 IsLinkageLookup = true; 3354 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3355 IsLinkageLookup = true; 3356 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3357 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3358 IsLinkageLookup = true; 3359 3360 if (IsLinkageLookup) 3361 Previous.clear(LookupRedeclarationWithLinkage); 3362 3363 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3364 } else { // Something like "int foo::x;" 3365 LookupQualifiedName(Previous, DC); 3366 3367 // Don't consider using declarations as previous declarations for 3368 // out-of-line members. 3369 RemoveUsingDecls(Previous); 3370 3371 // C++ 7.3.1.2p2: 3372 // Members (including explicit specializations of templates) of a named 3373 // namespace can also be defined outside that namespace by explicit 3374 // qualification of the name being defined, provided that the entity being 3375 // defined was already declared in the namespace and the definition appears 3376 // after the point of declaration in a namespace that encloses the 3377 // declarations namespace. 3378 // 3379 // Note that we only check the context at this point. We don't yet 3380 // have enough information to make sure that PrevDecl is actually 3381 // the declaration we want to match. For example, given: 3382 // 3383 // class X { 3384 // void f(); 3385 // void f(float); 3386 // }; 3387 // 3388 // void X::f(int) { } // ill-formed 3389 // 3390 // In this case, PrevDecl will point to the overload set 3391 // containing the two f's declared in X, but neither of them 3392 // matches. 3393 3394 // First check whether we named the global scope. 3395 if (isa<TranslationUnitDecl>(DC)) { 3396 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3397 << Name << D.getCXXScopeSpec().getRange(); 3398 } else { 3399 DeclContext *Cur = CurContext; 3400 while (isa<LinkageSpecDecl>(Cur)) 3401 Cur = Cur->getParent(); 3402 if (!Cur->Encloses(DC)) { 3403 // The qualifying scope doesn't enclose the original declaration. 3404 // Emit diagnostic based on current scope. 3405 SourceLocation L = D.getIdentifierLoc(); 3406 SourceRange R = D.getCXXScopeSpec().getRange(); 3407 if (isa<FunctionDecl>(Cur)) 3408 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3409 else 3410 Diag(L, diag::err_invalid_declarator_scope) 3411 << Name << cast<NamedDecl>(DC) << R; 3412 D.setInvalidType(); 3413 } 3414 3415 // C++11 8.3p1: 3416 // ... "The nested-name-specifier of the qualified declarator-id shall 3417 // not begin with a decltype-specifer" 3418 NestedNameSpecifierLoc SpecLoc = 3419 D.getCXXScopeSpec().getWithLocInContext(Context); 3420 assert(SpecLoc && "A non-empty CXXScopeSpec should have a non-empty " 3421 "NestedNameSpecifierLoc"); 3422 while (SpecLoc.getPrefix()) 3423 SpecLoc = SpecLoc.getPrefix(); 3424 if (dyn_cast_or_null<DecltypeType>( 3425 SpecLoc.getNestedNameSpecifier()->getAsType())) 3426 Diag(SpecLoc.getBeginLoc(), diag::err_decltype_in_declarator) 3427 << SpecLoc.getTypeLoc().getSourceRange(); 3428 } 3429 } 3430 3431 if (Previous.isSingleResult() && 3432 Previous.getFoundDecl()->isTemplateParameter()) { 3433 // Maybe we will complain about the shadowed template parameter. 3434 if (!D.isInvalidType()) 3435 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3436 Previous.getFoundDecl()); 3437 3438 // Just pretend that we didn't see the previous declaration. 3439 Previous.clear(); 3440 } 3441 3442 // In C++, the previous declaration we find might be a tag type 3443 // (class or enum). In this case, the new declaration will hide the 3444 // tag type. Note that this does does not apply if we're declaring a 3445 // typedef (C++ [dcl.typedef]p4). 3446 if (Previous.isSingleTagDecl() && 3447 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3448 Previous.clear(); 3449 3450 bool AddToScope = true; 3451 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3452 if (TemplateParamLists.size()) { 3453 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3454 return 0; 3455 } 3456 3457 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3458 } else if (R->isFunctionType()) { 3459 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3460 move(TemplateParamLists), 3461 AddToScope); 3462 } else { 3463 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3464 move(TemplateParamLists)); 3465 } 3466 3467 if (New == 0) 3468 return 0; 3469 3470 // If this has an identifier and is not an invalid redeclaration or 3471 // function template specialization, add it to the scope stack. 3472 if (New->getDeclName() && AddToScope && 3473 !(D.isRedeclaration() && New->isInvalidDecl())) 3474 PushOnScopeChains(New, S); 3475 3476 return New; 3477} 3478 3479/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3480/// types into constant array types in certain situations which would otherwise 3481/// be errors (for GCC compatibility). 3482static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3483 ASTContext &Context, 3484 bool &SizeIsNegative, 3485 llvm::APSInt &Oversized) { 3486 // This method tries to turn a variable array into a constant 3487 // array even when the size isn't an ICE. This is necessary 3488 // for compatibility with code that depends on gcc's buggy 3489 // constant expression folding, like struct {char x[(int)(char*)2];} 3490 SizeIsNegative = false; 3491 Oversized = 0; 3492 3493 if (T->isDependentType()) 3494 return QualType(); 3495 3496 QualifierCollector Qs; 3497 const Type *Ty = Qs.strip(T); 3498 3499 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3500 QualType Pointee = PTy->getPointeeType(); 3501 QualType FixedType = 3502 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3503 Oversized); 3504 if (FixedType.isNull()) return FixedType; 3505 FixedType = Context.getPointerType(FixedType); 3506 return Qs.apply(Context, FixedType); 3507 } 3508 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3509 QualType Inner = PTy->getInnerType(); 3510 QualType FixedType = 3511 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3512 Oversized); 3513 if (FixedType.isNull()) return FixedType; 3514 FixedType = Context.getParenType(FixedType); 3515 return Qs.apply(Context, FixedType); 3516 } 3517 3518 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3519 if (!VLATy) 3520 return QualType(); 3521 // FIXME: We should probably handle this case 3522 if (VLATy->getElementType()->isVariablyModifiedType()) 3523 return QualType(); 3524 3525 llvm::APSInt Res; 3526 if (!VLATy->getSizeExpr() || 3527 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3528 return QualType(); 3529 3530 // Check whether the array size is negative. 3531 if (Res.isSigned() && Res.isNegative()) { 3532 SizeIsNegative = true; 3533 return QualType(); 3534 } 3535 3536 // Check whether the array is too large to be addressed. 3537 unsigned ActiveSizeBits 3538 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3539 Res); 3540 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3541 Oversized = Res; 3542 return QualType(); 3543 } 3544 3545 return Context.getConstantArrayType(VLATy->getElementType(), 3546 Res, ArrayType::Normal, 0); 3547} 3548 3549/// \brief Register the given locally-scoped external C declaration so 3550/// that it can be found later for redeclarations 3551void 3552Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3553 const LookupResult &Previous, 3554 Scope *S) { 3555 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3556 "Decl is not a locally-scoped decl!"); 3557 // Note that we have a locally-scoped external with this name. 3558 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3559 3560 if (!Previous.isSingleResult()) 3561 return; 3562 3563 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3564 3565 // If there was a previous declaration of this variable, it may be 3566 // in our identifier chain. Update the identifier chain with the new 3567 // declaration. 3568 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3569 // The previous declaration was found on the identifer resolver 3570 // chain, so remove it from its scope. 3571 3572 if (S->isDeclScope(PrevDecl)) { 3573 // Special case for redeclarations in the SAME scope. 3574 // Because this declaration is going to be added to the identifier chain 3575 // later, we should temporarily take it OFF the chain. 3576 IdResolver.RemoveDecl(ND); 3577 3578 } else { 3579 // Find the scope for the original declaration. 3580 while (S && !S->isDeclScope(PrevDecl)) 3581 S = S->getParent(); 3582 } 3583 3584 if (S) 3585 S->RemoveDecl(PrevDecl); 3586 } 3587} 3588 3589llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3590Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3591 if (ExternalSource) { 3592 // Load locally-scoped external decls from the external source. 3593 SmallVector<NamedDecl *, 4> Decls; 3594 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3595 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3596 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3597 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3598 if (Pos == LocallyScopedExternalDecls.end()) 3599 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3600 } 3601 } 3602 3603 return LocallyScopedExternalDecls.find(Name); 3604} 3605 3606/// \brief Diagnose function specifiers on a declaration of an identifier that 3607/// does not identify a function. 3608void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3609 // FIXME: We should probably indicate the identifier in question to avoid 3610 // confusion for constructs like "inline int a(), b;" 3611 if (D.getDeclSpec().isInlineSpecified()) 3612 Diag(D.getDeclSpec().getInlineSpecLoc(), 3613 diag::err_inline_non_function); 3614 3615 if (D.getDeclSpec().isVirtualSpecified()) 3616 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3617 diag::err_virtual_non_function); 3618 3619 if (D.getDeclSpec().isExplicitSpecified()) 3620 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3621 diag::err_explicit_non_function); 3622} 3623 3624NamedDecl* 3625Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3626 TypeSourceInfo *TInfo, LookupResult &Previous) { 3627 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3628 if (D.getCXXScopeSpec().isSet()) { 3629 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3630 << D.getCXXScopeSpec().getRange(); 3631 D.setInvalidType(); 3632 // Pretend we didn't see the scope specifier. 3633 DC = CurContext; 3634 Previous.clear(); 3635 } 3636 3637 if (getLangOptions().CPlusPlus) { 3638 // Check that there are no default arguments (C++ only). 3639 CheckExtraCXXDefaultArguments(D); 3640 } 3641 3642 DiagnoseFunctionSpecifiers(D); 3643 3644 if (D.getDeclSpec().isThreadSpecified()) 3645 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3646 if (D.getDeclSpec().isConstexprSpecified()) 3647 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3648 << 1; 3649 3650 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3651 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3652 << D.getName().getSourceRange(); 3653 return 0; 3654 } 3655 3656 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3657 if (!NewTD) return 0; 3658 3659 // Handle attributes prior to checking for duplicates in MergeVarDecl 3660 ProcessDeclAttributes(S, NewTD, D); 3661 3662 CheckTypedefForVariablyModifiedType(S, NewTD); 3663 3664 bool Redeclaration = D.isRedeclaration(); 3665 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3666 D.setRedeclaration(Redeclaration); 3667 return ND; 3668} 3669 3670void 3671Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3672 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3673 // then it shall have block scope. 3674 // Note that variably modified types must be fixed before merging the decl so 3675 // that redeclarations will match. 3676 QualType T = NewTD->getUnderlyingType(); 3677 if (T->isVariablyModifiedType()) { 3678 getCurFunction()->setHasBranchProtectedScope(); 3679 3680 if (S->getFnParent() == 0) { 3681 bool SizeIsNegative; 3682 llvm::APSInt Oversized; 3683 QualType FixedTy = 3684 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3685 Oversized); 3686 if (!FixedTy.isNull()) { 3687 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3688 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3689 } else { 3690 if (SizeIsNegative) 3691 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3692 else if (T->isVariableArrayType()) 3693 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3694 else if (Oversized.getBoolValue()) 3695 Diag(NewTD->getLocation(), diag::err_array_too_large) 3696 << Oversized.toString(10); 3697 else 3698 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3699 NewTD->setInvalidDecl(); 3700 } 3701 } 3702 } 3703} 3704 3705 3706/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3707/// declares a typedef-name, either using the 'typedef' type specifier or via 3708/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3709NamedDecl* 3710Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3711 LookupResult &Previous, bool &Redeclaration) { 3712 // Merge the decl with the existing one if appropriate. If the decl is 3713 // in an outer scope, it isn't the same thing. 3714 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3715 /*ExplicitInstantiationOrSpecialization=*/false); 3716 if (!Previous.empty()) { 3717 Redeclaration = true; 3718 MergeTypedefNameDecl(NewTD, Previous); 3719 } 3720 3721 // If this is the C FILE type, notify the AST context. 3722 if (IdentifierInfo *II = NewTD->getIdentifier()) 3723 if (!NewTD->isInvalidDecl() && 3724 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3725 if (II->isStr("FILE")) 3726 Context.setFILEDecl(NewTD); 3727 else if (II->isStr("jmp_buf")) 3728 Context.setjmp_bufDecl(NewTD); 3729 else if (II->isStr("sigjmp_buf")) 3730 Context.setsigjmp_bufDecl(NewTD); 3731 else if (II->isStr("ucontext_t")) 3732 Context.setucontext_tDecl(NewTD); 3733 else if (II->isStr("__builtin_va_list")) 3734 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3735 } 3736 3737 return NewTD; 3738} 3739 3740/// \brief Determines whether the given declaration is an out-of-scope 3741/// previous declaration. 3742/// 3743/// This routine should be invoked when name lookup has found a 3744/// previous declaration (PrevDecl) that is not in the scope where a 3745/// new declaration by the same name is being introduced. If the new 3746/// declaration occurs in a local scope, previous declarations with 3747/// linkage may still be considered previous declarations (C99 3748/// 6.2.2p4-5, C++ [basic.link]p6). 3749/// 3750/// \param PrevDecl the previous declaration found by name 3751/// lookup 3752/// 3753/// \param DC the context in which the new declaration is being 3754/// declared. 3755/// 3756/// \returns true if PrevDecl is an out-of-scope previous declaration 3757/// for a new delcaration with the same name. 3758static bool 3759isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3760 ASTContext &Context) { 3761 if (!PrevDecl) 3762 return false; 3763 3764 if (!PrevDecl->hasLinkage()) 3765 return false; 3766 3767 if (Context.getLangOptions().CPlusPlus) { 3768 // C++ [basic.link]p6: 3769 // If there is a visible declaration of an entity with linkage 3770 // having the same name and type, ignoring entities declared 3771 // outside the innermost enclosing namespace scope, the block 3772 // scope declaration declares that same entity and receives the 3773 // linkage of the previous declaration. 3774 DeclContext *OuterContext = DC->getRedeclContext(); 3775 if (!OuterContext->isFunctionOrMethod()) 3776 // This rule only applies to block-scope declarations. 3777 return false; 3778 3779 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3780 if (PrevOuterContext->isRecord()) 3781 // We found a member function: ignore it. 3782 return false; 3783 3784 // Find the innermost enclosing namespace for the new and 3785 // previous declarations. 3786 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3787 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3788 3789 // The previous declaration is in a different namespace, so it 3790 // isn't the same function. 3791 if (!OuterContext->Equals(PrevOuterContext)) 3792 return false; 3793 } 3794 3795 return true; 3796} 3797 3798static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3799 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3800 if (!SS.isSet()) return; 3801 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3802} 3803 3804bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3805 QualType type = decl->getType(); 3806 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3807 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3808 // Various kinds of declaration aren't allowed to be __autoreleasing. 3809 unsigned kind = -1U; 3810 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3811 if (var->hasAttr<BlocksAttr>()) 3812 kind = 0; // __block 3813 else if (!var->hasLocalStorage()) 3814 kind = 1; // global 3815 } else if (isa<ObjCIvarDecl>(decl)) { 3816 kind = 3; // ivar 3817 } else if (isa<FieldDecl>(decl)) { 3818 kind = 2; // field 3819 } 3820 3821 if (kind != -1U) { 3822 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3823 << kind; 3824 } 3825 } else if (lifetime == Qualifiers::OCL_None) { 3826 // Try to infer lifetime. 3827 if (!type->isObjCLifetimeType()) 3828 return false; 3829 3830 lifetime = type->getObjCARCImplicitLifetime(); 3831 type = Context.getLifetimeQualifiedType(type, lifetime); 3832 decl->setType(type); 3833 } 3834 3835 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3836 // Thread-local variables cannot have lifetime. 3837 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3838 var->isThreadSpecified()) { 3839 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3840 << var->getType(); 3841 return true; 3842 } 3843 } 3844 3845 return false; 3846} 3847 3848NamedDecl* 3849Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3850 TypeSourceInfo *TInfo, LookupResult &Previous, 3851 MultiTemplateParamsArg TemplateParamLists) { 3852 QualType R = TInfo->getType(); 3853 DeclarationName Name = GetNameForDeclarator(D).getName(); 3854 3855 // Check that there are no default arguments (C++ only). 3856 if (getLangOptions().CPlusPlus) 3857 CheckExtraCXXDefaultArguments(D); 3858 3859 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3860 assert(SCSpec != DeclSpec::SCS_typedef && 3861 "Parser allowed 'typedef' as storage class VarDecl."); 3862 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3863 if (SCSpec == DeclSpec::SCS_mutable) { 3864 // mutable can only appear on non-static class members, so it's always 3865 // an error here 3866 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3867 D.setInvalidType(); 3868 SC = SC_None; 3869 } 3870 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3871 VarDecl::StorageClass SCAsWritten 3872 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3873 3874 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3875 if (!II) { 3876 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3877 << Name; 3878 return 0; 3879 } 3880 3881 DiagnoseFunctionSpecifiers(D); 3882 3883 if (!DC->isRecord() && S->getFnParent() == 0) { 3884 // C99 6.9p2: The storage-class specifiers auto and register shall not 3885 // appear in the declaration specifiers in an external declaration. 3886 if (SC == SC_Auto || SC == SC_Register) { 3887 3888 // If this is a register variable with an asm label specified, then this 3889 // is a GNU extension. 3890 if (SC == SC_Register && D.getAsmLabel()) 3891 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3892 else 3893 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3894 D.setInvalidType(); 3895 } 3896 } 3897 3898 if (getLangOptions().OpenCL) { 3899 // Set up the special work-group-local storage class for variables in the 3900 // OpenCL __local address space. 3901 if (R.getAddressSpace() == LangAS::opencl_local) 3902 SC = SC_OpenCLWorkGroupLocal; 3903 } 3904 3905 bool isExplicitSpecialization = false; 3906 VarDecl *NewVD; 3907 if (!getLangOptions().CPlusPlus) { 3908 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3909 D.getIdentifierLoc(), II, 3910 R, TInfo, SC, SCAsWritten); 3911 3912 if (D.isInvalidType()) 3913 NewVD->setInvalidDecl(); 3914 } else { 3915 if (DC->isRecord() && !CurContext->isRecord()) { 3916 // This is an out-of-line definition of a static data member. 3917 if (SC == SC_Static) { 3918 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3919 diag::err_static_out_of_line) 3920 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3921 } else if (SC == SC_None) 3922 SC = SC_Static; 3923 } 3924 if (SC == SC_Static) { 3925 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3926 if (RD->isLocalClass()) 3927 Diag(D.getIdentifierLoc(), 3928 diag::err_static_data_member_not_allowed_in_local_class) 3929 << Name << RD->getDeclName(); 3930 3931 // C++ [class.union]p1: If a union contains a static data member, 3932 // the program is ill-formed. 3933 // 3934 // We also disallow static data members in anonymous structs. 3935 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3936 Diag(D.getIdentifierLoc(), 3937 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3938 << Name << RD->isUnion(); 3939 } 3940 } 3941 3942 // Match up the template parameter lists with the scope specifier, then 3943 // determine whether we have a template or a template specialization. 3944 isExplicitSpecialization = false; 3945 bool Invalid = false; 3946 if (TemplateParameterList *TemplateParams 3947 = MatchTemplateParametersToScopeSpecifier( 3948 D.getDeclSpec().getSourceRange().getBegin(), 3949 D.getIdentifierLoc(), 3950 D.getCXXScopeSpec(), 3951 TemplateParamLists.get(), 3952 TemplateParamLists.size(), 3953 /*never a friend*/ false, 3954 isExplicitSpecialization, 3955 Invalid)) { 3956 if (TemplateParams->size() > 0) { 3957 // There is no such thing as a variable template. 3958 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3959 << II 3960 << SourceRange(TemplateParams->getTemplateLoc(), 3961 TemplateParams->getRAngleLoc()); 3962 return 0; 3963 } else { 3964 // There is an extraneous 'template<>' for this variable. Complain 3965 // about it, but allow the declaration of the variable. 3966 Diag(TemplateParams->getTemplateLoc(), 3967 diag::err_template_variable_noparams) 3968 << II 3969 << SourceRange(TemplateParams->getTemplateLoc(), 3970 TemplateParams->getRAngleLoc()); 3971 } 3972 } 3973 3974 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3975 D.getIdentifierLoc(), II, 3976 R, TInfo, SC, SCAsWritten); 3977 3978 // If this decl has an auto type in need of deduction, make a note of the 3979 // Decl so we can diagnose uses of it in its own initializer. 3980 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3981 R->getContainedAutoType()) 3982 ParsingInitForAutoVars.insert(NewVD); 3983 3984 if (D.isInvalidType() || Invalid) 3985 NewVD->setInvalidDecl(); 3986 3987 SetNestedNameSpecifier(NewVD, D); 3988 3989 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3990 NewVD->setTemplateParameterListsInfo(Context, 3991 TemplateParamLists.size(), 3992 TemplateParamLists.release()); 3993 } 3994 3995 if (D.getDeclSpec().isConstexprSpecified()) 3996 NewVD->setConstexpr(true); 3997 } 3998 3999 // Set the lexical context. If the declarator has a C++ scope specifier, the 4000 // lexical context will be different from the semantic context. 4001 NewVD->setLexicalDeclContext(CurContext); 4002 4003 if (D.getDeclSpec().isThreadSpecified()) { 4004 if (NewVD->hasLocalStorage()) 4005 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 4006 else if (!Context.getTargetInfo().isTLSSupported()) 4007 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 4008 else 4009 NewVD->setThreadSpecified(true); 4010 } 4011 4012 if (D.getDeclSpec().isModulePrivateSpecified()) { 4013 if (isExplicitSpecialization) 4014 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 4015 << 2 4016 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4017 else if (NewVD->hasLocalStorage()) 4018 Diag(NewVD->getLocation(), diag::err_module_private_local) 4019 << 0 << NewVD->getDeclName() 4020 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 4021 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4022 else 4023 NewVD->setModulePrivate(); 4024 } 4025 4026 // Handle attributes prior to checking for duplicates in MergeVarDecl 4027 ProcessDeclAttributes(S, NewVD, D); 4028 4029 // In auto-retain/release, infer strong retension for variables of 4030 // retainable type. 4031 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4032 NewVD->setInvalidDecl(); 4033 4034 // Handle GNU asm-label extension (encoded as an attribute). 4035 if (Expr *E = (Expr*)D.getAsmLabel()) { 4036 // The parser guarantees this is a string. 4037 StringLiteral *SE = cast<StringLiteral>(E); 4038 StringRef Label = SE->getString(); 4039 if (S->getFnParent() != 0) { 4040 switch (SC) { 4041 case SC_None: 4042 case SC_Auto: 4043 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4044 break; 4045 case SC_Register: 4046 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4047 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4048 break; 4049 case SC_Static: 4050 case SC_Extern: 4051 case SC_PrivateExtern: 4052 case SC_OpenCLWorkGroupLocal: 4053 break; 4054 } 4055 } 4056 4057 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4058 Context, Label)); 4059 } 4060 4061 // Diagnose shadowed variables before filtering for scope. 4062 if (!D.getCXXScopeSpec().isSet()) 4063 CheckShadow(S, NewVD, Previous); 4064 4065 // Don't consider existing declarations that are in a different 4066 // scope and are out-of-semantic-context declarations (if the new 4067 // declaration has linkage). 4068 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4069 isExplicitSpecialization); 4070 4071 if (!getLangOptions().CPlusPlus) { 4072 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4073 } else { 4074 // Merge the decl with the existing one if appropriate. 4075 if (!Previous.empty()) { 4076 if (Previous.isSingleResult() && 4077 isa<FieldDecl>(Previous.getFoundDecl()) && 4078 D.getCXXScopeSpec().isSet()) { 4079 // The user tried to define a non-static data member 4080 // out-of-line (C++ [dcl.meaning]p1). 4081 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4082 << D.getCXXScopeSpec().getRange(); 4083 Previous.clear(); 4084 NewVD->setInvalidDecl(); 4085 } 4086 } else if (D.getCXXScopeSpec().isSet()) { 4087 // No previous declaration in the qualifying scope. 4088 Diag(D.getIdentifierLoc(), diag::err_no_member) 4089 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4090 << D.getCXXScopeSpec().getRange(); 4091 NewVD->setInvalidDecl(); 4092 } 4093 4094 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4095 4096 // This is an explicit specialization of a static data member. Check it. 4097 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4098 CheckMemberSpecialization(NewVD, Previous)) 4099 NewVD->setInvalidDecl(); 4100 } 4101 4102 // attributes declared post-definition are currently ignored 4103 // FIXME: This should be handled in attribute merging, not 4104 // here. 4105 if (Previous.isSingleResult()) { 4106 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4107 if (Def && (Def = Def->getDefinition()) && 4108 Def != NewVD && D.hasAttributes()) { 4109 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4110 Diag(Def->getLocation(), diag::note_previous_definition); 4111 } 4112 } 4113 4114 // If this is a locally-scoped extern C variable, update the map of 4115 // such variables. 4116 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4117 !NewVD->isInvalidDecl()) 4118 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4119 4120 // If there's a #pragma GCC visibility in scope, and this isn't a class 4121 // member, set the visibility of this variable. 4122 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4123 AddPushedVisibilityAttribute(NewVD); 4124 4125 MarkUnusedFileScopedDecl(NewVD); 4126 4127 return NewVD; 4128} 4129 4130/// \brief Diagnose variable or built-in function shadowing. Implements 4131/// -Wshadow. 4132/// 4133/// This method is called whenever a VarDecl is added to a "useful" 4134/// scope. 4135/// 4136/// \param S the scope in which the shadowing name is being declared 4137/// \param R the lookup of the name 4138/// 4139void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4140 // Return if warning is ignored. 4141 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4142 DiagnosticsEngine::Ignored) 4143 return; 4144 4145 // Don't diagnose declarations at file scope. 4146 if (D->hasGlobalStorage()) 4147 return; 4148 4149 DeclContext *NewDC = D->getDeclContext(); 4150 4151 // Only diagnose if we're shadowing an unambiguous field or variable. 4152 if (R.getResultKind() != LookupResult::Found) 4153 return; 4154 4155 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4156 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4157 return; 4158 4159 // Fields are not shadowed by variables in C++ static methods. 4160 if (isa<FieldDecl>(ShadowedDecl)) 4161 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4162 if (MD->isStatic()) 4163 return; 4164 4165 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4166 if (shadowedVar->isExternC()) { 4167 // For shadowing external vars, make sure that we point to the global 4168 // declaration, not a locally scoped extern declaration. 4169 for (VarDecl::redecl_iterator 4170 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4171 I != E; ++I) 4172 if (I->isFileVarDecl()) { 4173 ShadowedDecl = *I; 4174 break; 4175 } 4176 } 4177 4178 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4179 4180 // Only warn about certain kinds of shadowing for class members. 4181 if (NewDC && NewDC->isRecord()) { 4182 // In particular, don't warn about shadowing non-class members. 4183 if (!OldDC->isRecord()) 4184 return; 4185 4186 // TODO: should we warn about static data members shadowing 4187 // static data members from base classes? 4188 4189 // TODO: don't diagnose for inaccessible shadowed members. 4190 // This is hard to do perfectly because we might friend the 4191 // shadowing context, but that's just a false negative. 4192 } 4193 4194 // Determine what kind of declaration we're shadowing. 4195 unsigned Kind; 4196 if (isa<RecordDecl>(OldDC)) { 4197 if (isa<FieldDecl>(ShadowedDecl)) 4198 Kind = 3; // field 4199 else 4200 Kind = 2; // static data member 4201 } else if (OldDC->isFileContext()) 4202 Kind = 1; // global 4203 else 4204 Kind = 0; // local 4205 4206 DeclarationName Name = R.getLookupName(); 4207 4208 // Emit warning and note. 4209 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4210 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4211} 4212 4213/// \brief Check -Wshadow without the advantage of a previous lookup. 4214void Sema::CheckShadow(Scope *S, VarDecl *D) { 4215 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4216 DiagnosticsEngine::Ignored) 4217 return; 4218 4219 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4220 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4221 LookupName(R, S); 4222 CheckShadow(S, D, R); 4223} 4224 4225/// \brief Perform semantic checking on a newly-created variable 4226/// declaration. 4227/// 4228/// This routine performs all of the type-checking required for a 4229/// variable declaration once it has been built. It is used both to 4230/// check variables after they have been parsed and their declarators 4231/// have been translated into a declaration, and to check variables 4232/// that have been instantiated from a template. 4233/// 4234/// Sets NewVD->isInvalidDecl() if an error was encountered. 4235/// 4236/// Returns true if the variable declaration is a redeclaration. 4237bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4238 LookupResult &Previous) { 4239 // If the decl is already known invalid, don't check it. 4240 if (NewVD->isInvalidDecl()) 4241 return false; 4242 4243 QualType T = NewVD->getType(); 4244 4245 if (T->isObjCObjectType()) { 4246 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4247 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4248 T = Context.getObjCObjectPointerType(T); 4249 NewVD->setType(T); 4250 } 4251 4252 // Emit an error if an address space was applied to decl with local storage. 4253 // This includes arrays of objects with address space qualifiers, but not 4254 // automatic variables that point to other address spaces. 4255 // ISO/IEC TR 18037 S5.1.2 4256 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4257 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4258 NewVD->setInvalidDecl(); 4259 return false; 4260 } 4261 4262 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4263 && !NewVD->hasAttr<BlocksAttr>()) { 4264 if (getLangOptions().getGC() != LangOptions::NonGC) 4265 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4266 else 4267 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4268 } 4269 4270 bool isVM = T->isVariablyModifiedType(); 4271 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4272 NewVD->hasAttr<BlocksAttr>()) 4273 getCurFunction()->setHasBranchProtectedScope(); 4274 4275 if ((isVM && NewVD->hasLinkage()) || 4276 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4277 bool SizeIsNegative; 4278 llvm::APSInt Oversized; 4279 QualType FixedTy = 4280 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4281 Oversized); 4282 4283 if (FixedTy.isNull() && T->isVariableArrayType()) { 4284 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4285 // FIXME: This won't give the correct result for 4286 // int a[10][n]; 4287 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4288 4289 if (NewVD->isFileVarDecl()) 4290 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4291 << SizeRange; 4292 else if (NewVD->getStorageClass() == SC_Static) 4293 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4294 << SizeRange; 4295 else 4296 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4297 << SizeRange; 4298 NewVD->setInvalidDecl(); 4299 return false; 4300 } 4301 4302 if (FixedTy.isNull()) { 4303 if (NewVD->isFileVarDecl()) 4304 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4305 else 4306 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4307 NewVD->setInvalidDecl(); 4308 return false; 4309 } 4310 4311 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4312 NewVD->setType(FixedTy); 4313 } 4314 4315 if (Previous.empty() && NewVD->isExternC()) { 4316 // Since we did not find anything by this name and we're declaring 4317 // an extern "C" variable, look for a non-visible extern "C" 4318 // declaration with the same name. 4319 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4320 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4321 if (Pos != LocallyScopedExternalDecls.end()) 4322 Previous.addDecl(Pos->second); 4323 } 4324 4325 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4326 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4327 << T; 4328 NewVD->setInvalidDecl(); 4329 return false; 4330 } 4331 4332 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4333 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4334 NewVD->setInvalidDecl(); 4335 return false; 4336 } 4337 4338 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4339 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4340 NewVD->setInvalidDecl(); 4341 return false; 4342 } 4343 4344 if (!Previous.empty()) { 4345 MergeVarDecl(NewVD, Previous); 4346 return true; 4347 } 4348 return false; 4349} 4350 4351/// \brief Data used with FindOverriddenMethod 4352struct FindOverriddenMethodData { 4353 Sema *S; 4354 CXXMethodDecl *Method; 4355}; 4356 4357/// \brief Member lookup function that determines whether a given C++ 4358/// method overrides a method in a base class, to be used with 4359/// CXXRecordDecl::lookupInBases(). 4360static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4361 CXXBasePath &Path, 4362 void *UserData) { 4363 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4364 4365 FindOverriddenMethodData *Data 4366 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4367 4368 DeclarationName Name = Data->Method->getDeclName(); 4369 4370 // FIXME: Do we care about other names here too? 4371 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4372 // We really want to find the base class destructor here. 4373 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4374 CanQualType CT = Data->S->Context.getCanonicalType(T); 4375 4376 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4377 } 4378 4379 for (Path.Decls = BaseRecord->lookup(Name); 4380 Path.Decls.first != Path.Decls.second; 4381 ++Path.Decls.first) { 4382 NamedDecl *D = *Path.Decls.first; 4383 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4384 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4385 return true; 4386 } 4387 } 4388 4389 return false; 4390} 4391 4392/// AddOverriddenMethods - See if a method overrides any in the base classes, 4393/// and if so, check that it's a valid override and remember it. 4394bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4395 // Look for virtual methods in base classes that this method might override. 4396 CXXBasePaths Paths; 4397 FindOverriddenMethodData Data; 4398 Data.Method = MD; 4399 Data.S = this; 4400 bool AddedAny = false; 4401 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4402 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4403 E = Paths.found_decls_end(); I != E; ++I) { 4404 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4405 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4406 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4407 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4408 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4409 AddedAny = true; 4410 } 4411 } 4412 } 4413 } 4414 4415 return AddedAny; 4416} 4417 4418namespace { 4419 // Struct for holding all of the extra arguments needed by 4420 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4421 struct ActOnFDArgs { 4422 Scope *S; 4423 Declarator &D; 4424 MultiTemplateParamsArg TemplateParamLists; 4425 bool AddToScope; 4426 }; 4427} 4428 4429namespace { 4430 4431// Callback to only accept typo corrections that have a non-zero edit distance. 4432class DifferentNameValidatorCCC : public CorrectionCandidateCallback { 4433 public: 4434 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 4435 return candidate.getEditDistance() > 0; 4436 } 4437}; 4438 4439} 4440 4441/// \brief Generate diagnostics for an invalid function redeclaration. 4442/// 4443/// This routine handles generating the diagnostic messages for an invalid 4444/// function redeclaration, including finding possible similar declarations 4445/// or performing typo correction if there are no previous declarations with 4446/// the same name. 4447/// 4448/// Returns a NamedDecl iff typo correction was performed and substituting in 4449/// the new declaration name does not cause new errors. 4450static NamedDecl* DiagnoseInvalidRedeclaration( 4451 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4452 ActOnFDArgs &ExtraArgs) { 4453 NamedDecl *Result = NULL; 4454 DeclarationName Name = NewFD->getDeclName(); 4455 DeclContext *NewDC = NewFD->getDeclContext(); 4456 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4457 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4458 llvm::SmallVector<unsigned, 1> MismatchedParams; 4459 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4460 TypoCorrection Correction; 4461 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4462 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4463 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4464 : diag::err_member_def_does_not_match; 4465 4466 NewFD->setInvalidDecl(); 4467 SemaRef.LookupQualifiedName(Prev, NewDC); 4468 assert(!Prev.isAmbiguous() && 4469 "Cannot have an ambiguity in previous-declaration lookup"); 4470 DifferentNameValidatorCCC Validator; 4471 if (!Prev.empty()) { 4472 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4473 Func != FuncEnd; ++Func) { 4474 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4475 if (FD && 4476 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4477 // Add 1 to the index so that 0 can mean the mismatch didn't 4478 // involve a parameter 4479 unsigned ParamNum = 4480 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4481 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4482 } 4483 } 4484 // If the qualified name lookup yielded nothing, try typo correction 4485 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4486 Prev.getLookupKind(), 0, 0, 4487 Validator, NewDC))) { 4488 // Trap errors. 4489 Sema::SFINAETrap Trap(SemaRef); 4490 4491 // Set up everything for the call to ActOnFunctionDeclarator 4492 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4493 ExtraArgs.D.getIdentifierLoc()); 4494 Previous.clear(); 4495 Previous.setLookupName(Correction.getCorrection()); 4496 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4497 CDeclEnd = Correction.end(); 4498 CDecl != CDeclEnd; ++CDecl) { 4499 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4500 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4501 MismatchedParams)) { 4502 Previous.addDecl(FD); 4503 } 4504 } 4505 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4506 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4507 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4508 // eliminate the need for the parameter pack ExtraArgs. 4509 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4510 NewFD->getDeclContext(), 4511 NewFD->getTypeSourceInfo(), 4512 Previous, 4513 ExtraArgs.TemplateParamLists, 4514 ExtraArgs.AddToScope); 4515 if (Trap.hasErrorOccurred()) { 4516 // Pretend the typo correction never occurred 4517 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4518 ExtraArgs.D.getIdentifierLoc()); 4519 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4520 Previous.clear(); 4521 Previous.setLookupName(Name); 4522 Result = NULL; 4523 } else { 4524 for (LookupResult::iterator Func = Previous.begin(), 4525 FuncEnd = Previous.end(); 4526 Func != FuncEnd; ++Func) { 4527 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4528 NearMatches.push_back(std::make_pair(FD, 0)); 4529 } 4530 } 4531 if (NearMatches.empty()) { 4532 // Ignore the correction if it didn't yield any close FunctionDecl matches 4533 Correction = TypoCorrection(); 4534 } else { 4535 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4536 : diag::err_member_def_does_not_match_suggest; 4537 } 4538 } 4539 4540 if (Correction) 4541 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4542 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4543 << FixItHint::CreateReplacement( 4544 NewFD->getLocation(), 4545 Correction.getAsString(SemaRef.getLangOptions())); 4546 else 4547 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4548 << Name << NewDC << NewFD->getLocation(); 4549 4550 bool NewFDisConst = false; 4551 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4552 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4553 4554 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4555 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4556 NearMatch != NearMatchEnd; ++NearMatch) { 4557 FunctionDecl *FD = NearMatch->first; 4558 bool FDisConst = false; 4559 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4560 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4561 4562 if (unsigned Idx = NearMatch->second) { 4563 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4564 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4565 diag::note_member_def_close_param_match) 4566 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4567 } else if (Correction) { 4568 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4569 << Correction.getQuoted(SemaRef.getLangOptions()); 4570 } else if (FDisConst != NewFDisConst) { 4571 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4572 << NewFDisConst << FD->getSourceRange().getEnd(); 4573 } else 4574 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4575 } 4576 return Result; 4577} 4578 4579static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4580 Declarator &D) { 4581 switch (D.getDeclSpec().getStorageClassSpec()) { 4582 default: llvm_unreachable("Unknown storage class!"); 4583 case DeclSpec::SCS_auto: 4584 case DeclSpec::SCS_register: 4585 case DeclSpec::SCS_mutable: 4586 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4587 diag::err_typecheck_sclass_func); 4588 D.setInvalidType(); 4589 break; 4590 case DeclSpec::SCS_unspecified: break; 4591 case DeclSpec::SCS_extern: return SC_Extern; 4592 case DeclSpec::SCS_static: { 4593 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4594 // C99 6.7.1p5: 4595 // The declaration of an identifier for a function that has 4596 // block scope shall have no explicit storage-class specifier 4597 // other than extern 4598 // See also (C++ [dcl.stc]p4). 4599 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4600 diag::err_static_block_func); 4601 break; 4602 } else 4603 return SC_Static; 4604 } 4605 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4606 } 4607 4608 // No explicit storage class has already been returned 4609 return SC_None; 4610} 4611 4612static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4613 DeclContext *DC, QualType &R, 4614 TypeSourceInfo *TInfo, 4615 FunctionDecl::StorageClass SC, 4616 bool &IsVirtualOkay) { 4617 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4618 DeclarationName Name = NameInfo.getName(); 4619 4620 FunctionDecl *NewFD = 0; 4621 bool isInline = D.getDeclSpec().isInlineSpecified(); 4622 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4623 FunctionDecl::StorageClass SCAsWritten 4624 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4625 4626 if (!SemaRef.getLangOptions().CPlusPlus) { 4627 // Determine whether the function was written with a 4628 // prototype. This true when: 4629 // - there is a prototype in the declarator, or 4630 // - the type R of the function is some kind of typedef or other reference 4631 // to a type name (which eventually refers to a function type). 4632 bool HasPrototype = 4633 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4634 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4635 4636 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4637 D.getSourceRange().getBegin(), NameInfo, R, 4638 TInfo, SC, SCAsWritten, isInline, 4639 HasPrototype); 4640 if (D.isInvalidType()) 4641 NewFD->setInvalidDecl(); 4642 4643 // Set the lexical context. 4644 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4645 4646 return NewFD; 4647 } 4648 4649 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4650 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4651 4652 // Check that the return type is not an abstract class type. 4653 // For record types, this is done by the AbstractClassUsageDiagnoser once 4654 // the class has been completely parsed. 4655 if (!DC->isRecord() && 4656 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4657 R->getAs<FunctionType>()->getResultType(), 4658 diag::err_abstract_type_in_decl, 4659 SemaRef.AbstractReturnType)) 4660 D.setInvalidType(); 4661 4662 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4663 // This is a C++ constructor declaration. 4664 assert(DC->isRecord() && 4665 "Constructors can only be declared in a member context"); 4666 4667 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4668 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4669 D.getSourceRange().getBegin(), NameInfo, 4670 R, TInfo, isExplicit, isInline, 4671 /*isImplicitlyDeclared=*/false, 4672 isConstexpr); 4673 4674 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4675 // This is a C++ destructor declaration. 4676 if (DC->isRecord()) { 4677 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4678 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4679 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4680 SemaRef.Context, Record, 4681 D.getSourceRange().getBegin(), 4682 NameInfo, R, TInfo, isInline, 4683 /*isImplicitlyDeclared=*/false); 4684 4685 // If the class is complete, then we now create the implicit exception 4686 // specification. If the class is incomplete or dependent, we can't do 4687 // it yet. 4688 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4689 Record->getDefinition() && !Record->isBeingDefined() && 4690 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4691 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4692 } 4693 4694 IsVirtualOkay = true; 4695 return NewDD; 4696 4697 } else { 4698 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4699 D.setInvalidType(); 4700 4701 // Create a FunctionDecl to satisfy the function definition parsing 4702 // code path. 4703 return FunctionDecl::Create(SemaRef.Context, DC, 4704 D.getSourceRange().getBegin(), 4705 D.getIdentifierLoc(), Name, R, TInfo, 4706 SC, SCAsWritten, isInline, 4707 /*hasPrototype=*/true, isConstexpr); 4708 } 4709 4710 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4711 if (!DC->isRecord()) { 4712 SemaRef.Diag(D.getIdentifierLoc(), 4713 diag::err_conv_function_not_member); 4714 return 0; 4715 } 4716 4717 SemaRef.CheckConversionDeclarator(D, R, SC); 4718 IsVirtualOkay = true; 4719 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4720 D.getSourceRange().getBegin(), NameInfo, 4721 R, TInfo, isInline, isExplicit, 4722 isConstexpr, SourceLocation()); 4723 4724 } else if (DC->isRecord()) { 4725 // If the name of the function is the same as the name of the record, 4726 // then this must be an invalid constructor that has a return type. 4727 // (The parser checks for a return type and makes the declarator a 4728 // constructor if it has no return type). 4729 if (Name.getAsIdentifierInfo() && 4730 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4731 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4732 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4733 << SourceRange(D.getIdentifierLoc()); 4734 return 0; 4735 } 4736 4737 bool isStatic = SC == SC_Static; 4738 4739 // [class.free]p1: 4740 // Any allocation function for a class T is a static member 4741 // (even if not explicitly declared static). 4742 if (Name.getCXXOverloadedOperator() == OO_New || 4743 Name.getCXXOverloadedOperator() == OO_Array_New) 4744 isStatic = true; 4745 4746 // [class.free]p6 Any deallocation function for a class X is a static member 4747 // (even if not explicitly declared static). 4748 if (Name.getCXXOverloadedOperator() == OO_Delete || 4749 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4750 isStatic = true; 4751 4752 IsVirtualOkay = !isStatic; 4753 4754 // This is a C++ method declaration. 4755 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4756 D.getSourceRange().getBegin(), NameInfo, R, 4757 TInfo, isStatic, SCAsWritten, isInline, 4758 isConstexpr, SourceLocation()); 4759 4760 } else { 4761 // Determine whether the function was written with a 4762 // prototype. This true when: 4763 // - we're in C++ (where every function has a prototype), 4764 return FunctionDecl::Create(SemaRef.Context, DC, 4765 D.getSourceRange().getBegin(), 4766 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4767 true/*HasPrototype*/, isConstexpr); 4768 } 4769} 4770 4771NamedDecl* 4772Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4773 TypeSourceInfo *TInfo, LookupResult &Previous, 4774 MultiTemplateParamsArg TemplateParamLists, 4775 bool &AddToScope) { 4776 QualType R = TInfo->getType(); 4777 4778 assert(R.getTypePtr()->isFunctionType()); 4779 4780 // TODO: consider using NameInfo for diagnostic. 4781 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4782 DeclarationName Name = NameInfo.getName(); 4783 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4784 4785 if (D.getDeclSpec().isThreadSpecified()) 4786 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4787 4788 // Do not allow returning a objc interface by-value. 4789 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4790 Diag(D.getIdentifierLoc(), 4791 diag::err_object_cannot_be_passed_returned_by_value) << 0 4792 << R->getAs<FunctionType>()->getResultType() 4793 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4794 4795 QualType T = R->getAs<FunctionType>()->getResultType(); 4796 T = Context.getObjCObjectPointerType(T); 4797 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4798 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4799 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4800 FPT->getNumArgs(), EPI); 4801 } 4802 else if (isa<FunctionNoProtoType>(R)) 4803 R = Context.getFunctionNoProtoType(T); 4804 } 4805 4806 bool isFriend = false; 4807 FunctionTemplateDecl *FunctionTemplate = 0; 4808 bool isExplicitSpecialization = false; 4809 bool isFunctionTemplateSpecialization = false; 4810 bool isDependentClassScopeExplicitSpecialization = false; 4811 bool isVirtualOkay = false; 4812 4813 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4814 isVirtualOkay); 4815 if (!NewFD) return 0; 4816 4817 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 4818 NewFD->setTopLevelDeclInObjCContainer(); 4819 4820 if (getLangOptions().CPlusPlus) { 4821 bool isInline = D.getDeclSpec().isInlineSpecified(); 4822 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4823 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4824 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4825 isFriend = D.getDeclSpec().isFriendSpecified(); 4826 if (isFriend && !isInline && D.isFunctionDefinition()) { 4827 // C++ [class.friend]p5 4828 // A function can be defined in a friend declaration of a 4829 // class . . . . Such a function is implicitly inline. 4830 NewFD->setImplicitlyInline(); 4831 } 4832 4833 SetNestedNameSpecifier(NewFD, D); 4834 isExplicitSpecialization = false; 4835 isFunctionTemplateSpecialization = false; 4836 if (D.isInvalidType()) 4837 NewFD->setInvalidDecl(); 4838 4839 // Set the lexical context. If the declarator has a C++ 4840 // scope specifier, or is the object of a friend declaration, the 4841 // lexical context will be different from the semantic context. 4842 NewFD->setLexicalDeclContext(CurContext); 4843 4844 // Match up the template parameter lists with the scope specifier, then 4845 // determine whether we have a template or a template specialization. 4846 bool Invalid = false; 4847 if (TemplateParameterList *TemplateParams 4848 = MatchTemplateParametersToScopeSpecifier( 4849 D.getDeclSpec().getSourceRange().getBegin(), 4850 D.getIdentifierLoc(), 4851 D.getCXXScopeSpec(), 4852 TemplateParamLists.get(), 4853 TemplateParamLists.size(), 4854 isFriend, 4855 isExplicitSpecialization, 4856 Invalid)) { 4857 if (TemplateParams->size() > 0) { 4858 // This is a function template 4859 4860 // Check that we can declare a template here. 4861 if (CheckTemplateDeclScope(S, TemplateParams)) 4862 return 0; 4863 4864 // A destructor cannot be a template. 4865 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4866 Diag(NewFD->getLocation(), diag::err_destructor_template); 4867 return 0; 4868 } 4869 4870 // If we're adding a template to a dependent context, we may need to 4871 // rebuilding some of the types used within the template parameter list, 4872 // now that we know what the current instantiation is. 4873 if (DC->isDependentContext()) { 4874 ContextRAII SavedContext(*this, DC); 4875 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4876 Invalid = true; 4877 } 4878 4879 4880 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4881 NewFD->getLocation(), 4882 Name, TemplateParams, 4883 NewFD); 4884 FunctionTemplate->setLexicalDeclContext(CurContext); 4885 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4886 4887 // For source fidelity, store the other template param lists. 4888 if (TemplateParamLists.size() > 1) { 4889 NewFD->setTemplateParameterListsInfo(Context, 4890 TemplateParamLists.size() - 1, 4891 TemplateParamLists.release()); 4892 } 4893 } else { 4894 // This is a function template specialization. 4895 isFunctionTemplateSpecialization = true; 4896 // For source fidelity, store all the template param lists. 4897 NewFD->setTemplateParameterListsInfo(Context, 4898 TemplateParamLists.size(), 4899 TemplateParamLists.release()); 4900 4901 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4902 if (isFriend) { 4903 // We want to remove the "template<>", found here. 4904 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4905 4906 // If we remove the template<> and the name is not a 4907 // template-id, we're actually silently creating a problem: 4908 // the friend declaration will refer to an untemplated decl, 4909 // and clearly the user wants a template specialization. So 4910 // we need to insert '<>' after the name. 4911 SourceLocation InsertLoc; 4912 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4913 InsertLoc = D.getName().getSourceRange().getEnd(); 4914 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4915 } 4916 4917 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4918 << Name << RemoveRange 4919 << FixItHint::CreateRemoval(RemoveRange) 4920 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4921 } 4922 } 4923 } 4924 else { 4925 // All template param lists were matched against the scope specifier: 4926 // this is NOT (an explicit specialization of) a template. 4927 if (TemplateParamLists.size() > 0) 4928 // For source fidelity, store all the template param lists. 4929 NewFD->setTemplateParameterListsInfo(Context, 4930 TemplateParamLists.size(), 4931 TemplateParamLists.release()); 4932 } 4933 4934 if (Invalid) { 4935 NewFD->setInvalidDecl(); 4936 if (FunctionTemplate) 4937 FunctionTemplate->setInvalidDecl(); 4938 } 4939 4940 // If we see "T var();" at block scope, where T is a class type, it is 4941 // probably an attempt to initialize a variable, not a function declaration. 4942 // We don't catch this case earlier, since there is no ambiguity here. 4943 if (!FunctionTemplate && D.getFunctionDefinitionKind() == FDK_Declaration && 4944 CurContext->isFunctionOrMethod() && 4945 D.getNumTypeObjects() == 1 && D.isFunctionDeclarator() && 4946 D.getDeclSpec().getStorageClassSpecAsWritten() 4947 == DeclSpec::SCS_unspecified) { 4948 QualType T = R->getAs<FunctionType>()->getResultType(); 4949 DeclaratorChunk &C = D.getTypeObject(0); 4950 if (!T->isVoidType() && C.Fun.NumArgs == 0 && !C.Fun.isVariadic && 4951 !C.Fun.TrailingReturnType && 4952 C.Fun.getExceptionSpecType() == EST_None) { 4953 SourceRange ParenRange(C.Loc, C.EndLoc); 4954 Diag(C.Loc, diag::warn_empty_parens_are_function_decl) << ParenRange; 4955 4956 // If the declaration looks like: 4957 // T var1, 4958 // f(); 4959 // and name lookup finds a function named 'f', then the ',' was 4960 // probably intended to be a ';'. 4961 if (!D.isFirstDeclarator() && D.getIdentifier()) { 4962 FullSourceLoc Comma(D.getCommaLoc(), SourceMgr); 4963 FullSourceLoc Name(D.getIdentifierLoc(), SourceMgr); 4964 if (Comma.getFileID() != Name.getFileID() || 4965 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 4966 LookupResult Result(*this, D.getIdentifier(), SourceLocation(), 4967 LookupOrdinaryName); 4968 if (LookupName(Result, S)) 4969 Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 4970 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") << NewFD; 4971 } 4972 } 4973 const CXXRecordDecl *RD = T->getAsCXXRecordDecl(); 4974 // Empty parens mean value-initialization, and no parens mean default 4975 // initialization. These are equivalent if the default constructor is 4976 // user-provided, or if zero-initialization is a no-op. 4977 if (RD && RD->hasDefinition() && 4978 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 4979 Diag(C.Loc, diag::note_empty_parens_default_ctor) 4980 << FixItHint::CreateRemoval(ParenRange); 4981 else if (const char *Init = getFixItZeroInitializerForType(T)) 4982 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 4983 << FixItHint::CreateReplacement(ParenRange, Init); 4984 else if (LangOpts.CPlusPlus0x) 4985 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 4986 << FixItHint::CreateReplacement(ParenRange, "{}"); 4987 } 4988 } 4989 4990 // C++ [dcl.fct.spec]p5: 4991 // The virtual specifier shall only be used in declarations of 4992 // nonstatic class member functions that appear within a 4993 // member-specification of a class declaration; see 10.3. 4994 // 4995 if (isVirtual && !NewFD->isInvalidDecl()) { 4996 if (!isVirtualOkay) { 4997 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4998 diag::err_virtual_non_function); 4999 } else if (!CurContext->isRecord()) { 5000 // 'virtual' was specified outside of the class. 5001 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5002 diag::err_virtual_out_of_class) 5003 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5004 } else if (NewFD->getDescribedFunctionTemplate()) { 5005 // C++ [temp.mem]p3: 5006 // A member function template shall not be virtual. 5007 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5008 diag::err_virtual_member_function_template) 5009 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5010 } else { 5011 // Okay: Add virtual to the method. 5012 NewFD->setVirtualAsWritten(true); 5013 } 5014 } 5015 5016 // C++ [dcl.fct.spec]p3: 5017 // The inline specifier shall not appear on a block scope function 5018 // declaration. 5019 if (isInline && !NewFD->isInvalidDecl()) { 5020 if (CurContext->isFunctionOrMethod()) { 5021 // 'inline' is not allowed on block scope function declaration. 5022 Diag(D.getDeclSpec().getInlineSpecLoc(), 5023 diag::err_inline_declaration_block_scope) << Name 5024 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 5025 } 5026 } 5027 5028 // C++ [dcl.fct.spec]p6: 5029 // The explicit specifier shall be used only in the declaration of a 5030 // constructor or conversion function within its class definition; 5031 // see 12.3.1 and 12.3.2. 5032 if (isExplicit && !NewFD->isInvalidDecl()) { 5033 if (!CurContext->isRecord()) { 5034 // 'explicit' was specified outside of the class. 5035 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5036 diag::err_explicit_out_of_class) 5037 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5038 } else if (!isa<CXXConstructorDecl>(NewFD) && 5039 !isa<CXXConversionDecl>(NewFD)) { 5040 // 'explicit' was specified on a function that wasn't a constructor 5041 // or conversion function. 5042 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5043 diag::err_explicit_non_ctor_or_conv_function) 5044 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5045 } 5046 } 5047 5048 if (isConstexpr) { 5049 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 5050 // are implicitly inline. 5051 NewFD->setImplicitlyInline(); 5052 5053 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 5054 // be either constructors or to return a literal type. Therefore, 5055 // destructors cannot be declared constexpr. 5056 if (isa<CXXDestructorDecl>(NewFD)) 5057 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 5058 } 5059 5060 // If __module_private__ was specified, mark the function accordingly. 5061 if (D.getDeclSpec().isModulePrivateSpecified()) { 5062 if (isFunctionTemplateSpecialization) { 5063 SourceLocation ModulePrivateLoc 5064 = D.getDeclSpec().getModulePrivateSpecLoc(); 5065 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5066 << 0 5067 << FixItHint::CreateRemoval(ModulePrivateLoc); 5068 } else { 5069 NewFD->setModulePrivate(); 5070 if (FunctionTemplate) 5071 FunctionTemplate->setModulePrivate(); 5072 } 5073 } 5074 5075 if (isFriend) { 5076 // For now, claim that the objects have no previous declaration. 5077 if (FunctionTemplate) { 5078 FunctionTemplate->setObjectOfFriendDecl(false); 5079 FunctionTemplate->setAccess(AS_public); 5080 } 5081 NewFD->setObjectOfFriendDecl(false); 5082 NewFD->setAccess(AS_public); 5083 } 5084 5085 // If a function is defined as defaulted or deleted, mark it as such now. 5086 switch (D.getFunctionDefinitionKind()) { 5087 case FDK_Declaration: 5088 case FDK_Definition: 5089 break; 5090 5091 case FDK_Defaulted: 5092 NewFD->setDefaulted(); 5093 break; 5094 5095 case FDK_Deleted: 5096 NewFD->setDeletedAsWritten(); 5097 break; 5098 } 5099 5100 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5101 D.isFunctionDefinition()) { 5102 // C++ [class.mfct]p2: 5103 // A member function may be defined (8.4) in its class definition, in 5104 // which case it is an inline member function (7.1.2) 5105 NewFD->setImplicitlyInline(); 5106 } 5107 5108 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5109 !CurContext->isRecord()) { 5110 // C++ [class.static]p1: 5111 // A data or function member of a class may be declared static 5112 // in a class definition, in which case it is a static member of 5113 // the class. 5114 5115 // Complain about the 'static' specifier if it's on an out-of-line 5116 // member function definition. 5117 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5118 diag::err_static_out_of_line) 5119 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5120 } 5121 } 5122 5123 // Filter out previous declarations that don't match the scope. 5124 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5125 isExplicitSpecialization || 5126 isFunctionTemplateSpecialization); 5127 5128 // Handle GNU asm-label extension (encoded as an attribute). 5129 if (Expr *E = (Expr*) D.getAsmLabel()) { 5130 // The parser guarantees this is a string. 5131 StringLiteral *SE = cast<StringLiteral>(E); 5132 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5133 SE->getString())); 5134 } 5135 5136 // Copy the parameter declarations from the declarator D to the function 5137 // declaration NewFD, if they are available. First scavenge them into Params. 5138 SmallVector<ParmVarDecl*, 16> Params; 5139 if (D.isFunctionDeclarator()) { 5140 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5141 5142 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5143 // function that takes no arguments, not a function that takes a 5144 // single void argument. 5145 // We let through "const void" here because Sema::GetTypeForDeclarator 5146 // already checks for that case. 5147 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5148 FTI.ArgInfo[0].Param && 5149 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5150 // Empty arg list, don't push any params. 5151 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5152 5153 // In C++, the empty parameter-type-list must be spelled "void"; a 5154 // typedef of void is not permitted. 5155 if (getLangOptions().CPlusPlus && 5156 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5157 bool IsTypeAlias = false; 5158 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5159 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5160 else if (const TemplateSpecializationType *TST = 5161 Param->getType()->getAs<TemplateSpecializationType>()) 5162 IsTypeAlias = TST->isTypeAlias(); 5163 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5164 << IsTypeAlias; 5165 } 5166 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5167 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5168 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5169 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5170 Param->setDeclContext(NewFD); 5171 Params.push_back(Param); 5172 5173 if (Param->isInvalidDecl()) 5174 NewFD->setInvalidDecl(); 5175 } 5176 } 5177 5178 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5179 // When we're declaring a function with a typedef, typeof, etc as in the 5180 // following example, we'll need to synthesize (unnamed) 5181 // parameters for use in the declaration. 5182 // 5183 // @code 5184 // typedef void fn(int); 5185 // fn f; 5186 // @endcode 5187 5188 // Synthesize a parameter for each argument type. 5189 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5190 AE = FT->arg_type_end(); AI != AE; ++AI) { 5191 ParmVarDecl *Param = 5192 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5193 Param->setScopeInfo(0, Params.size()); 5194 Params.push_back(Param); 5195 } 5196 } else { 5197 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5198 "Should not need args for typedef of non-prototype fn"); 5199 } 5200 5201 // Finally, we know we have the right number of parameters, install them. 5202 NewFD->setParams(Params); 5203 5204 // Process the non-inheritable attributes on this declaration. 5205 ProcessDeclAttributes(S, NewFD, D, 5206 /*NonInheritable=*/true, /*Inheritable=*/false); 5207 5208 if (!getLangOptions().CPlusPlus) { 5209 // Perform semantic checking on the function declaration. 5210 bool isExplicitSpecialization=false; 5211 if (!NewFD->isInvalidDecl()) { 5212 if (NewFD->getResultType()->isVariablyModifiedType()) { 5213 // Functions returning a variably modified type violate C99 6.7.5.2p2 5214 // because all functions have linkage. 5215 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5216 NewFD->setInvalidDecl(); 5217 } else { 5218 if (NewFD->isMain()) 5219 CheckMain(NewFD, D.getDeclSpec()); 5220 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5221 isExplicitSpecialization)); 5222 } 5223 } 5224 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5225 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5226 "previous declaration set still overloaded"); 5227 } else { 5228 // If the declarator is a template-id, translate the parser's template 5229 // argument list into our AST format. 5230 bool HasExplicitTemplateArgs = false; 5231 TemplateArgumentListInfo TemplateArgs; 5232 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5233 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5234 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5235 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5236 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5237 TemplateId->getTemplateArgs(), 5238 TemplateId->NumArgs); 5239 translateTemplateArguments(TemplateArgsPtr, 5240 TemplateArgs); 5241 TemplateArgsPtr.release(); 5242 5243 HasExplicitTemplateArgs = true; 5244 5245 if (NewFD->isInvalidDecl()) { 5246 HasExplicitTemplateArgs = false; 5247 } else if (FunctionTemplate) { 5248 // Function template with explicit template arguments. 5249 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5250 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5251 5252 HasExplicitTemplateArgs = false; 5253 } else if (!isFunctionTemplateSpecialization && 5254 !D.getDeclSpec().isFriendSpecified()) { 5255 // We have encountered something that the user meant to be a 5256 // specialization (because it has explicitly-specified template 5257 // arguments) but that was not introduced with a "template<>" (or had 5258 // too few of them). 5259 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5260 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5261 << FixItHint::CreateInsertion( 5262 D.getDeclSpec().getSourceRange().getBegin(), 5263 "template<> "); 5264 isFunctionTemplateSpecialization = true; 5265 } else { 5266 // "friend void foo<>(int);" is an implicit specialization decl. 5267 isFunctionTemplateSpecialization = true; 5268 } 5269 } else if (isFriend && isFunctionTemplateSpecialization) { 5270 // This combination is only possible in a recovery case; the user 5271 // wrote something like: 5272 // template <> friend void foo(int); 5273 // which we're recovering from as if the user had written: 5274 // friend void foo<>(int); 5275 // Go ahead and fake up a template id. 5276 HasExplicitTemplateArgs = true; 5277 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5278 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5279 } 5280 5281 // If it's a friend (and only if it's a friend), it's possible 5282 // that either the specialized function type or the specialized 5283 // template is dependent, and therefore matching will fail. In 5284 // this case, don't check the specialization yet. 5285 bool InstantiationDependent = false; 5286 if (isFunctionTemplateSpecialization && isFriend && 5287 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5288 TemplateSpecializationType::anyDependentTemplateArguments( 5289 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5290 InstantiationDependent))) { 5291 assert(HasExplicitTemplateArgs && 5292 "friend function specialization without template args"); 5293 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5294 Previous)) 5295 NewFD->setInvalidDecl(); 5296 } else if (isFunctionTemplateSpecialization) { 5297 if (CurContext->isDependentContext() && CurContext->isRecord() 5298 && !isFriend) { 5299 isDependentClassScopeExplicitSpecialization = true; 5300 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5301 diag::ext_function_specialization_in_class : 5302 diag::err_function_specialization_in_class) 5303 << NewFD->getDeclName(); 5304 } else if (CheckFunctionTemplateSpecialization(NewFD, 5305 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5306 Previous)) 5307 NewFD->setInvalidDecl(); 5308 5309 // C++ [dcl.stc]p1: 5310 // A storage-class-specifier shall not be specified in an explicit 5311 // specialization (14.7.3) 5312 if (SC != SC_None) { 5313 if (SC != NewFD->getStorageClass()) 5314 Diag(NewFD->getLocation(), 5315 diag::err_explicit_specialization_inconsistent_storage_class) 5316 << SC 5317 << FixItHint::CreateRemoval( 5318 D.getDeclSpec().getStorageClassSpecLoc()); 5319 5320 else 5321 Diag(NewFD->getLocation(), 5322 diag::ext_explicit_specialization_storage_class) 5323 << FixItHint::CreateRemoval( 5324 D.getDeclSpec().getStorageClassSpecLoc()); 5325 } 5326 5327 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5328 if (CheckMemberSpecialization(NewFD, Previous)) 5329 NewFD->setInvalidDecl(); 5330 } 5331 5332 // Perform semantic checking on the function declaration. 5333 if (!isDependentClassScopeExplicitSpecialization) { 5334 if (NewFD->isInvalidDecl()) { 5335 // If this is a class member, mark the class invalid immediately. 5336 // This avoids some consistency errors later. 5337 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5338 methodDecl->getParent()->setInvalidDecl(); 5339 } else { 5340 if (NewFD->isMain()) 5341 CheckMain(NewFD, D.getDeclSpec()); 5342 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5343 isExplicitSpecialization)); 5344 } 5345 } 5346 5347 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5348 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5349 "previous declaration set still overloaded"); 5350 5351 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5352 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5353 NewFD->setInvalidDecl(); 5354 5355 NamedDecl *PrincipalDecl = (FunctionTemplate 5356 ? cast<NamedDecl>(FunctionTemplate) 5357 : NewFD); 5358 5359 if (isFriend && D.isRedeclaration()) { 5360 AccessSpecifier Access = AS_public; 5361 if (!NewFD->isInvalidDecl()) 5362 Access = NewFD->getPreviousDecl()->getAccess(); 5363 5364 NewFD->setAccess(Access); 5365 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5366 5367 PrincipalDecl->setObjectOfFriendDecl(true); 5368 } 5369 5370 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5371 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5372 PrincipalDecl->setNonMemberOperator(); 5373 5374 // If we have a function template, check the template parameter 5375 // list. This will check and merge default template arguments. 5376 if (FunctionTemplate) { 5377 FunctionTemplateDecl *PrevTemplate = 5378 FunctionTemplate->getPreviousDecl(); 5379 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5380 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5381 D.getDeclSpec().isFriendSpecified() 5382 ? (D.isFunctionDefinition() 5383 ? TPC_FriendFunctionTemplateDefinition 5384 : TPC_FriendFunctionTemplate) 5385 : (D.getCXXScopeSpec().isSet() && 5386 DC && DC->isRecord() && 5387 DC->isDependentContext()) 5388 ? TPC_ClassTemplateMember 5389 : TPC_FunctionTemplate); 5390 } 5391 5392 if (NewFD->isInvalidDecl()) { 5393 // Ignore all the rest of this. 5394 } else if (!D.isRedeclaration()) { 5395 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5396 AddToScope }; 5397 // Fake up an access specifier if it's supposed to be a class member. 5398 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5399 NewFD->setAccess(AS_public); 5400 5401 // Qualified decls generally require a previous declaration. 5402 if (D.getCXXScopeSpec().isSet()) { 5403 // ...with the major exception of templated-scope or 5404 // dependent-scope friend declarations. 5405 5406 // TODO: we currently also suppress this check in dependent 5407 // contexts because (1) the parameter depth will be off when 5408 // matching friend templates and (2) we might actually be 5409 // selecting a friend based on a dependent factor. But there 5410 // are situations where these conditions don't apply and we 5411 // can actually do this check immediately. 5412 if (isFriend && 5413 (TemplateParamLists.size() || 5414 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5415 CurContext->isDependentContext())) { 5416 // ignore these 5417 } else { 5418 // The user tried to provide an out-of-line definition for a 5419 // function that is a member of a class or namespace, but there 5420 // was no such member function declared (C++ [class.mfct]p2, 5421 // C++ [namespace.memdef]p2). For example: 5422 // 5423 // class X { 5424 // void f() const; 5425 // }; 5426 // 5427 // void X::f() { } // ill-formed 5428 // 5429 // Complain about this problem, and attempt to suggest close 5430 // matches (e.g., those that differ only in cv-qualifiers and 5431 // whether the parameter types are references). 5432 5433 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5434 NewFD, 5435 ExtraArgs)) { 5436 AddToScope = ExtraArgs.AddToScope; 5437 return Result; 5438 } 5439 } 5440 5441 // Unqualified local friend declarations are required to resolve 5442 // to something. 5443 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5444 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5445 NewFD, 5446 ExtraArgs)) { 5447 AddToScope = ExtraArgs.AddToScope; 5448 return Result; 5449 } 5450 } 5451 5452 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5453 !isFriend && !isFunctionTemplateSpecialization && 5454 !isExplicitSpecialization) { 5455 // An out-of-line member function declaration must also be a 5456 // definition (C++ [dcl.meaning]p1). 5457 // Note that this is not the case for explicit specializations of 5458 // function templates or member functions of class templates, per 5459 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5460 // extension for compatibility with old SWIG code which likes to 5461 // generate them. 5462 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5463 << D.getCXXScopeSpec().getRange(); 5464 } 5465 } 5466 5467 5468 // Handle attributes. We need to have merged decls when handling attributes 5469 // (for example to check for conflicts, etc). 5470 // FIXME: This needs to happen before we merge declarations. Then, 5471 // let attribute merging cope with attribute conflicts. 5472 ProcessDeclAttributes(S, NewFD, D, 5473 /*NonInheritable=*/false, /*Inheritable=*/true); 5474 5475 // attributes declared post-definition are currently ignored 5476 // FIXME: This should happen during attribute merging 5477 if (D.isRedeclaration() && Previous.isSingleResult()) { 5478 const FunctionDecl *Def; 5479 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5480 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5481 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5482 Diag(Def->getLocation(), diag::note_previous_definition); 5483 } 5484 } 5485 5486 AddKnownFunctionAttributes(NewFD); 5487 5488 if (NewFD->hasAttr<OverloadableAttr>() && 5489 !NewFD->getType()->getAs<FunctionProtoType>()) { 5490 Diag(NewFD->getLocation(), 5491 diag::err_attribute_overloadable_no_prototype) 5492 << NewFD; 5493 5494 // Turn this into a variadic function with no parameters. 5495 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5496 FunctionProtoType::ExtProtoInfo EPI; 5497 EPI.Variadic = true; 5498 EPI.ExtInfo = FT->getExtInfo(); 5499 5500 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5501 NewFD->setType(R); 5502 } 5503 5504 // If there's a #pragma GCC visibility in scope, and this isn't a class 5505 // member, set the visibility of this function. 5506 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5507 AddPushedVisibilityAttribute(NewFD); 5508 5509 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5510 // marking the function. 5511 AddCFAuditedAttribute(NewFD); 5512 5513 // If this is a locally-scoped extern C function, update the 5514 // map of such names. 5515 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5516 && !NewFD->isInvalidDecl()) 5517 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5518 5519 // Set this FunctionDecl's range up to the right paren. 5520 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5521 5522 if (getLangOptions().CPlusPlus) { 5523 if (FunctionTemplate) { 5524 if (NewFD->isInvalidDecl()) 5525 FunctionTemplate->setInvalidDecl(); 5526 return FunctionTemplate; 5527 } 5528 } 5529 5530 MarkUnusedFileScopedDecl(NewFD); 5531 5532 if (getLangOptions().CUDA) 5533 if (IdentifierInfo *II = NewFD->getIdentifier()) 5534 if (!NewFD->isInvalidDecl() && 5535 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5536 if (II->isStr("cudaConfigureCall")) { 5537 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5538 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5539 5540 Context.setcudaConfigureCallDecl(NewFD); 5541 } 5542 } 5543 5544 // Here we have an function template explicit specialization at class scope. 5545 // The actually specialization will be postponed to template instatiation 5546 // time via the ClassScopeFunctionSpecializationDecl node. 5547 if (isDependentClassScopeExplicitSpecialization) { 5548 ClassScopeFunctionSpecializationDecl *NewSpec = 5549 ClassScopeFunctionSpecializationDecl::Create( 5550 Context, CurContext, SourceLocation(), 5551 cast<CXXMethodDecl>(NewFD)); 5552 CurContext->addDecl(NewSpec); 5553 AddToScope = false; 5554 } 5555 5556 return NewFD; 5557} 5558 5559/// \brief Perform semantic checking of a new function declaration. 5560/// 5561/// Performs semantic analysis of the new function declaration 5562/// NewFD. This routine performs all semantic checking that does not 5563/// require the actual declarator involved in the declaration, and is 5564/// used both for the declaration of functions as they are parsed 5565/// (called via ActOnDeclarator) and for the declaration of functions 5566/// that have been instantiated via C++ template instantiation (called 5567/// via InstantiateDecl). 5568/// 5569/// \param IsExplicitSpecialiation whether this new function declaration is 5570/// an explicit specialization of the previous declaration. 5571/// 5572/// This sets NewFD->isInvalidDecl() to true if there was an error. 5573/// 5574/// Returns true if the function declaration is a redeclaration. 5575bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5576 LookupResult &Previous, 5577 bool IsExplicitSpecialization) { 5578 assert(!NewFD->getResultType()->isVariablyModifiedType() 5579 && "Variably modified return types are not handled here"); 5580 5581 // Check for a previous declaration of this name. 5582 if (Previous.empty() && NewFD->isExternC()) { 5583 // Since we did not find anything by this name and we're declaring 5584 // an extern "C" function, look for a non-visible extern "C" 5585 // declaration with the same name. 5586 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5587 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5588 if (Pos != LocallyScopedExternalDecls.end()) 5589 Previous.addDecl(Pos->second); 5590 } 5591 5592 bool Redeclaration = false; 5593 5594 // Merge or overload the declaration with an existing declaration of 5595 // the same name, if appropriate. 5596 if (!Previous.empty()) { 5597 // Determine whether NewFD is an overload of PrevDecl or 5598 // a declaration that requires merging. If it's an overload, 5599 // there's no more work to do here; we'll just add the new 5600 // function to the scope. 5601 5602 NamedDecl *OldDecl = 0; 5603 if (!AllowOverloadingOfFunction(Previous, Context)) { 5604 Redeclaration = true; 5605 OldDecl = Previous.getFoundDecl(); 5606 } else { 5607 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5608 /*NewIsUsingDecl*/ false)) { 5609 case Ovl_Match: 5610 Redeclaration = true; 5611 break; 5612 5613 case Ovl_NonFunction: 5614 Redeclaration = true; 5615 break; 5616 5617 case Ovl_Overload: 5618 Redeclaration = false; 5619 break; 5620 } 5621 5622 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5623 // If a function name is overloadable in C, then every function 5624 // with that name must be marked "overloadable". 5625 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5626 << Redeclaration << NewFD; 5627 NamedDecl *OverloadedDecl = 0; 5628 if (Redeclaration) 5629 OverloadedDecl = OldDecl; 5630 else if (!Previous.empty()) 5631 OverloadedDecl = Previous.getRepresentativeDecl(); 5632 if (OverloadedDecl) 5633 Diag(OverloadedDecl->getLocation(), 5634 diag::note_attribute_overloadable_prev_overload); 5635 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5636 Context)); 5637 } 5638 } 5639 5640 if (Redeclaration) { 5641 // NewFD and OldDecl represent declarations that need to be 5642 // merged. 5643 if (MergeFunctionDecl(NewFD, OldDecl)) { 5644 NewFD->setInvalidDecl(); 5645 return Redeclaration; 5646 } 5647 5648 Previous.clear(); 5649 Previous.addDecl(OldDecl); 5650 5651 if (FunctionTemplateDecl *OldTemplateDecl 5652 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5653 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5654 FunctionTemplateDecl *NewTemplateDecl 5655 = NewFD->getDescribedFunctionTemplate(); 5656 assert(NewTemplateDecl && "Template/non-template mismatch"); 5657 if (CXXMethodDecl *Method 5658 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5659 Method->setAccess(OldTemplateDecl->getAccess()); 5660 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5661 } 5662 5663 // If this is an explicit specialization of a member that is a function 5664 // template, mark it as a member specialization. 5665 if (IsExplicitSpecialization && 5666 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5667 NewTemplateDecl->setMemberSpecialization(); 5668 assert(OldTemplateDecl->isMemberSpecialization()); 5669 } 5670 5671 } else { 5672 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5673 NewFD->setAccess(OldDecl->getAccess()); 5674 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5675 } 5676 } 5677 } 5678 5679 // Semantic checking for this function declaration (in isolation). 5680 if (getLangOptions().CPlusPlus) { 5681 // C++-specific checks. 5682 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5683 CheckConstructor(Constructor); 5684 } else if (CXXDestructorDecl *Destructor = 5685 dyn_cast<CXXDestructorDecl>(NewFD)) { 5686 CXXRecordDecl *Record = Destructor->getParent(); 5687 QualType ClassType = Context.getTypeDeclType(Record); 5688 5689 // FIXME: Shouldn't we be able to perform this check even when the class 5690 // type is dependent? Both gcc and edg can handle that. 5691 if (!ClassType->isDependentType()) { 5692 DeclarationName Name 5693 = Context.DeclarationNames.getCXXDestructorName( 5694 Context.getCanonicalType(ClassType)); 5695 if (NewFD->getDeclName() != Name) { 5696 Diag(NewFD->getLocation(), diag::err_destructor_name); 5697 NewFD->setInvalidDecl(); 5698 return Redeclaration; 5699 } 5700 } 5701 } else if (CXXConversionDecl *Conversion 5702 = dyn_cast<CXXConversionDecl>(NewFD)) { 5703 ActOnConversionDeclarator(Conversion); 5704 } 5705 5706 // Find any virtual functions that this function overrides. 5707 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5708 if (!Method->isFunctionTemplateSpecialization() && 5709 !Method->getDescribedFunctionTemplate()) { 5710 if (AddOverriddenMethods(Method->getParent(), Method)) { 5711 // If the function was marked as "static", we have a problem. 5712 if (NewFD->getStorageClass() == SC_Static) { 5713 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5714 << NewFD->getDeclName(); 5715 for (CXXMethodDecl::method_iterator 5716 Overridden = Method->begin_overridden_methods(), 5717 OverriddenEnd = Method->end_overridden_methods(); 5718 Overridden != OverriddenEnd; 5719 ++Overridden) { 5720 Diag((*Overridden)->getLocation(), 5721 diag::note_overridden_virtual_function); 5722 } 5723 } 5724 } 5725 } 5726 } 5727 5728 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5729 if (NewFD->isOverloadedOperator() && 5730 CheckOverloadedOperatorDeclaration(NewFD)) { 5731 NewFD->setInvalidDecl(); 5732 return Redeclaration; 5733 } 5734 5735 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5736 if (NewFD->getLiteralIdentifier() && 5737 CheckLiteralOperatorDeclaration(NewFD)) { 5738 NewFD->setInvalidDecl(); 5739 return Redeclaration; 5740 } 5741 5742 // In C++, check default arguments now that we have merged decls. Unless 5743 // the lexical context is the class, because in this case this is done 5744 // during delayed parsing anyway. 5745 if (!CurContext->isRecord()) 5746 CheckCXXDefaultArguments(NewFD); 5747 5748 // If this function declares a builtin function, check the type of this 5749 // declaration against the expected type for the builtin. 5750 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5751 ASTContext::GetBuiltinTypeError Error; 5752 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5753 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5754 // The type of this function differs from the type of the builtin, 5755 // so forget about the builtin entirely. 5756 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5757 } 5758 } 5759 5760 // If this function is declared as being extern "C", then check to see if 5761 // the function returns a UDT (class, struct, or union type) that is not C 5762 // compatible, and if it does, warn the user. 5763 if (NewFD->isExternC()) { 5764 QualType R = NewFD->getResultType(); 5765 if (!R.isPODType(Context) && 5766 !R->isVoidType()) 5767 Diag( NewFD->getLocation(), diag::warn_return_value_udt ) 5768 << NewFD << R; 5769 } 5770 } 5771 return Redeclaration; 5772} 5773 5774void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5775 // C++11 [basic.start.main]p3: A program that declares main to be inline, 5776 // static or constexpr is ill-formed. 5777 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5778 // shall not appear in a declaration of main. 5779 // static main is not an error under C99, but we should warn about it. 5780 if (FD->getStorageClass() == SC_Static) 5781 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5782 ? diag::err_static_main : diag::warn_static_main) 5783 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5784 if (FD->isInlineSpecified()) 5785 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5786 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5787 if (FD->isConstexpr()) { 5788 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main) 5789 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc()); 5790 FD->setConstexpr(false); 5791 } 5792 5793 QualType T = FD->getType(); 5794 assert(T->isFunctionType() && "function decl is not of function type"); 5795 const FunctionType* FT = T->getAs<FunctionType>(); 5796 5797 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5798 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5799 FD->setInvalidDecl(true); 5800 } 5801 5802 // Treat protoless main() as nullary. 5803 if (isa<FunctionNoProtoType>(FT)) return; 5804 5805 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5806 unsigned nparams = FTP->getNumArgs(); 5807 assert(FD->getNumParams() == nparams); 5808 5809 bool HasExtraParameters = (nparams > 3); 5810 5811 // Darwin passes an undocumented fourth argument of type char**. If 5812 // other platforms start sprouting these, the logic below will start 5813 // getting shifty. 5814 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5815 HasExtraParameters = false; 5816 5817 if (HasExtraParameters) { 5818 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5819 FD->setInvalidDecl(true); 5820 nparams = 3; 5821 } 5822 5823 // FIXME: a lot of the following diagnostics would be improved 5824 // if we had some location information about types. 5825 5826 QualType CharPP = 5827 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5828 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5829 5830 for (unsigned i = 0; i < nparams; ++i) { 5831 QualType AT = FTP->getArgType(i); 5832 5833 bool mismatch = true; 5834 5835 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5836 mismatch = false; 5837 else if (Expected[i] == CharPP) { 5838 // As an extension, the following forms are okay: 5839 // char const ** 5840 // char const * const * 5841 // char * const * 5842 5843 QualifierCollector qs; 5844 const PointerType* PT; 5845 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5846 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5847 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5848 qs.removeConst(); 5849 mismatch = !qs.empty(); 5850 } 5851 } 5852 5853 if (mismatch) { 5854 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5855 // TODO: suggest replacing given type with expected type 5856 FD->setInvalidDecl(true); 5857 } 5858 } 5859 5860 if (nparams == 1 && !FD->isInvalidDecl()) { 5861 Diag(FD->getLocation(), diag::warn_main_one_arg); 5862 } 5863 5864 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5865 Diag(FD->getLocation(), diag::err_main_template_decl); 5866 FD->setInvalidDecl(); 5867 } 5868} 5869 5870bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5871 // FIXME: Need strict checking. In C89, we need to check for 5872 // any assignment, increment, decrement, function-calls, or 5873 // commas outside of a sizeof. In C99, it's the same list, 5874 // except that the aforementioned are allowed in unevaluated 5875 // expressions. Everything else falls under the 5876 // "may accept other forms of constant expressions" exception. 5877 // (We never end up here for C++, so the constant expression 5878 // rules there don't matter.) 5879 if (Init->isConstantInitializer(Context, false)) 5880 return false; 5881 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5882 << Init->getSourceRange(); 5883 return true; 5884} 5885 5886namespace { 5887 // Visits an initialization expression to see if OrigDecl is evaluated in 5888 // its own initialization and throws a warning if it does. 5889 class SelfReferenceChecker 5890 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5891 Sema &S; 5892 Decl *OrigDecl; 5893 bool isRecordType; 5894 bool isPODType; 5895 5896 public: 5897 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5898 5899 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5900 S(S), OrigDecl(OrigDecl) { 5901 isPODType = false; 5902 isRecordType = false; 5903 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5904 isPODType = VD->getType().isPODType(S.Context); 5905 isRecordType = VD->getType()->isRecordType(); 5906 } 5907 } 5908 5909 void VisitExpr(Expr *E) { 5910 if (isa<ObjCMessageExpr>(*E)) return; 5911 if (isRecordType) { 5912 Expr *expr = E; 5913 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5914 ValueDecl *VD = ME->getMemberDecl(); 5915 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5916 expr = ME->getBase(); 5917 } 5918 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5919 HandleDeclRefExpr(DRE); 5920 return; 5921 } 5922 } 5923 Inherited::VisitExpr(E); 5924 } 5925 5926 void VisitMemberExpr(MemberExpr *E) { 5927 if (E->getType()->canDecayToPointerType()) return; 5928 if (isa<FieldDecl>(E->getMemberDecl())) 5929 if (DeclRefExpr *DRE 5930 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5931 HandleDeclRefExpr(DRE); 5932 return; 5933 } 5934 Inherited::VisitMemberExpr(E); 5935 } 5936 5937 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5938 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5939 (isRecordType && E->getCastKind() == CK_NoOp)) { 5940 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5941 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5942 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5943 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5944 HandleDeclRefExpr(DRE); 5945 return; 5946 } 5947 } 5948 Inherited::VisitImplicitCastExpr(E); 5949 } 5950 5951 void VisitUnaryOperator(UnaryOperator *E) { 5952 // For POD record types, addresses of its own members are well-defined. 5953 if (isRecordType && isPODType) return; 5954 Inherited::VisitUnaryOperator(E); 5955 } 5956 5957 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5958 Decl* ReferenceDecl = DRE->getDecl(); 5959 if (OrigDecl != ReferenceDecl) return; 5960 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5961 Sema::NotForRedeclaration); 5962 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5963 S.PDiag(diag::warn_uninit_self_reference_in_init) 5964 << Result.getLookupName() 5965 << OrigDecl->getLocation() 5966 << DRE->getSourceRange()); 5967 } 5968 }; 5969} 5970 5971/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5972void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5973 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5974} 5975 5976/// AddInitializerToDecl - Adds the initializer Init to the 5977/// declaration dcl. If DirectInit is true, this is C++ direct 5978/// initialization rather than copy initialization. 5979void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5980 bool DirectInit, bool TypeMayContainAuto) { 5981 // If there is no declaration, there was an error parsing it. Just ignore 5982 // the initializer. 5983 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5984 return; 5985 5986 // Check for self-references within variable initializers. 5987 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5988 // Variables declared within a function/method body are handled 5989 // by a dataflow analysis. 5990 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5991 CheckSelfReference(RealDecl, Init); 5992 } 5993 else { 5994 CheckSelfReference(RealDecl, Init); 5995 } 5996 5997 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5998 // With declarators parsed the way they are, the parser cannot 5999 // distinguish between a normal initializer and a pure-specifier. 6000 // Thus this grotesque test. 6001 IntegerLiteral *IL; 6002 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 6003 Context.getCanonicalType(IL->getType()) == Context.IntTy) 6004 CheckPureMethod(Method, Init->getSourceRange()); 6005 else { 6006 Diag(Method->getLocation(), diag::err_member_function_initialization) 6007 << Method->getDeclName() << Init->getSourceRange(); 6008 Method->setInvalidDecl(); 6009 } 6010 return; 6011 } 6012 6013 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6014 if (!VDecl) { 6015 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 6016 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6017 RealDecl->setInvalidDecl(); 6018 return; 6019 } 6020 6021 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6022 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6023 TypeSourceInfo *DeducedType = 0; 6024 if (DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType) == 6025 DAR_Failed) 6026 DiagnoseAutoDeductionFailure(VDecl, Init); 6027 if (!DeducedType) { 6028 RealDecl->setInvalidDecl(); 6029 return; 6030 } 6031 VDecl->setTypeSourceInfo(DeducedType); 6032 VDecl->setType(DeducedType->getType()); 6033 6034 // In ARC, infer lifetime. 6035 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 6036 VDecl->setInvalidDecl(); 6037 6038 // If this is a redeclaration, check that the type we just deduced matches 6039 // the previously declared type. 6040 if (VarDecl *Old = VDecl->getPreviousDecl()) 6041 MergeVarDeclTypes(VDecl, Old); 6042 } 6043 6044 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 6045 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 6046 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6047 VDecl->setInvalidDecl(); 6048 return; 6049 } 6050 6051 6052 // A definition must end up with a complete type, which means it must be 6053 // complete with the restriction that an array type might be completed by the 6054 // initializer; note that later code assumes this restriction. 6055 QualType BaseDeclType = VDecl->getType(); 6056 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 6057 BaseDeclType = Array->getElementType(); 6058 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 6059 diag::err_typecheck_decl_incomplete_type)) { 6060 RealDecl->setInvalidDecl(); 6061 return; 6062 } 6063 6064 // The variable can not have an abstract class type. 6065 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6066 diag::err_abstract_type_in_decl, 6067 AbstractVariableType)) 6068 VDecl->setInvalidDecl(); 6069 6070 const VarDecl *Def; 6071 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6072 Diag(VDecl->getLocation(), diag::err_redefinition) 6073 << VDecl->getDeclName(); 6074 Diag(Def->getLocation(), diag::note_previous_definition); 6075 VDecl->setInvalidDecl(); 6076 return; 6077 } 6078 6079 const VarDecl* PrevInit = 0; 6080 if (getLangOptions().CPlusPlus) { 6081 // C++ [class.static.data]p4 6082 // If a static data member is of const integral or const 6083 // enumeration type, its declaration in the class definition can 6084 // specify a constant-initializer which shall be an integral 6085 // constant expression (5.19). In that case, the member can appear 6086 // in integral constant expressions. The member shall still be 6087 // defined in a namespace scope if it is used in the program and the 6088 // namespace scope definition shall not contain an initializer. 6089 // 6090 // We already performed a redefinition check above, but for static 6091 // data members we also need to check whether there was an in-class 6092 // declaration with an initializer. 6093 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6094 Diag(VDecl->getLocation(), diag::err_redefinition) 6095 << VDecl->getDeclName(); 6096 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6097 return; 6098 } 6099 6100 if (VDecl->hasLocalStorage()) 6101 getCurFunction()->setHasBranchProtectedScope(); 6102 6103 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6104 VDecl->setInvalidDecl(); 6105 return; 6106 } 6107 } 6108 6109 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6110 // a kernel function cannot be initialized." 6111 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6112 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6113 VDecl->setInvalidDecl(); 6114 return; 6115 } 6116 6117 // Get the decls type and save a reference for later, since 6118 // CheckInitializerTypes may change it. 6119 QualType DclT = VDecl->getType(), SavT = DclT; 6120 6121 // Perform the initialization. 6122 if (!VDecl->isInvalidDecl()) { 6123 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6124 InitializationKind Kind 6125 = DirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6126 Init->getLocStart(), 6127 Init->getLocEnd()) 6128 : InitializationKind::CreateCopy(VDecl->getLocation(), 6129 Init->getLocStart()); 6130 6131 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6132 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6133 MultiExprArg(*this, &Init, 1), 6134 &DclT); 6135 if (Result.isInvalid()) { 6136 VDecl->setInvalidDecl(); 6137 return; 6138 } 6139 6140 Init = Result.takeAs<Expr>(); 6141 } 6142 6143 // If the type changed, it means we had an incomplete type that was 6144 // completed by the initializer. For example: 6145 // int ary[] = { 1, 3, 5 }; 6146 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6147 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6148 VDecl->setType(DclT); 6149 Init->setType(DclT.getNonReferenceType()); 6150 } 6151 6152 // Check any implicit conversions within the expression. 6153 CheckImplicitConversions(Init, VDecl->getLocation()); 6154 6155 if (!VDecl->isInvalidDecl()) 6156 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6157 6158 Init = MaybeCreateExprWithCleanups(Init); 6159 // Attach the initializer to the decl. 6160 VDecl->setInit(Init); 6161 6162 if (VDecl->isLocalVarDecl()) { 6163 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6164 // static storage duration shall be constant expressions or string literals. 6165 // C++ does not have this restriction. 6166 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl() && 6167 VDecl->getStorageClass() == SC_Static) 6168 CheckForConstantInitializer(Init, DclT); 6169 } else if (VDecl->isStaticDataMember() && 6170 VDecl->getLexicalDeclContext()->isRecord()) { 6171 // This is an in-class initialization for a static data member, e.g., 6172 // 6173 // struct S { 6174 // static const int value = 17; 6175 // }; 6176 6177 // C++ [class.mem]p4: 6178 // A member-declarator can contain a constant-initializer only 6179 // if it declares a static member (9.4) of const integral or 6180 // const enumeration type, see 9.4.2. 6181 // 6182 // C++11 [class.static.data]p3: 6183 // If a non-volatile const static data member is of integral or 6184 // enumeration type, its declaration in the class definition can 6185 // specify a brace-or-equal-initializer in which every initalizer-clause 6186 // that is an assignment-expression is a constant expression. A static 6187 // data member of literal type can be declared in the class definition 6188 // with the constexpr specifier; if so, its declaration shall specify a 6189 // brace-or-equal-initializer in which every initializer-clause that is 6190 // an assignment-expression is a constant expression. 6191 6192 // Do nothing on dependent types. 6193 if (DclT->isDependentType()) { 6194 6195 // Allow any 'static constexpr' members, whether or not they are of literal 6196 // type. We separately check that the initializer is a constant expression, 6197 // which implicitly requires the member to be of literal type. 6198 } else if (VDecl->isConstexpr()) { 6199 6200 // Require constness. 6201 } else if (!DclT.isConstQualified()) { 6202 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6203 << Init->getSourceRange(); 6204 VDecl->setInvalidDecl(); 6205 6206 // We allow integer constant expressions in all cases. 6207 } else if (DclT->isIntegralOrEnumerationType()) { 6208 // Check whether the expression is a constant expression. 6209 SourceLocation Loc; 6210 if (getLangOptions().CPlusPlus0x && DclT.isVolatileQualified()) 6211 // In C++11, a non-constexpr const static data member with an 6212 // in-class initializer cannot be volatile. 6213 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6214 else if (Init->isValueDependent()) 6215 ; // Nothing to check. 6216 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6217 ; // Ok, it's an ICE! 6218 else if (Init->isEvaluatable(Context)) { 6219 // If we can constant fold the initializer through heroics, accept it, 6220 // but report this as a use of an extension for -pedantic. 6221 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6222 << Init->getSourceRange(); 6223 } else { 6224 // Otherwise, this is some crazy unknown case. Report the issue at the 6225 // location provided by the isIntegerConstantExpr failed check. 6226 Diag(Loc, diag::err_in_class_initializer_non_constant) 6227 << Init->getSourceRange(); 6228 VDecl->setInvalidDecl(); 6229 } 6230 6231 // We allow foldable floating-point constants as an extension. 6232 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6233 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6234 << DclT << Init->getSourceRange(); 6235 if (getLangOptions().CPlusPlus0x) 6236 Diag(VDecl->getLocation(), 6237 diag::note_in_class_initializer_float_type_constexpr) 6238 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6239 6240 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6241 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6242 << Init->getSourceRange(); 6243 VDecl->setInvalidDecl(); 6244 } 6245 6246 // Suggest adding 'constexpr' in C++11 for literal types. 6247 } else if (getLangOptions().CPlusPlus0x && DclT->isLiteralType()) { 6248 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6249 << DclT << Init->getSourceRange() 6250 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6251 VDecl->setConstexpr(true); 6252 6253 } else { 6254 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6255 << DclT << Init->getSourceRange(); 6256 VDecl->setInvalidDecl(); 6257 } 6258 } else if (VDecl->isFileVarDecl()) { 6259 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6260 (!getLangOptions().CPlusPlus || 6261 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6262 Diag(VDecl->getLocation(), diag::warn_extern_init); 6263 6264 // C99 6.7.8p4. All file scoped initializers need to be constant. 6265 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) 6266 CheckForConstantInitializer(Init, DclT); 6267 } 6268 6269 CheckCompleteVariableDeclaration(VDecl); 6270} 6271 6272/// ActOnInitializerError - Given that there was an error parsing an 6273/// initializer for the given declaration, try to return to some form 6274/// of sanity. 6275void Sema::ActOnInitializerError(Decl *D) { 6276 // Our main concern here is re-establishing invariants like "a 6277 // variable's type is either dependent or complete". 6278 if (!D || D->isInvalidDecl()) return; 6279 6280 VarDecl *VD = dyn_cast<VarDecl>(D); 6281 if (!VD) return; 6282 6283 // Auto types are meaningless if we can't make sense of the initializer. 6284 if (ParsingInitForAutoVars.count(D)) { 6285 D->setInvalidDecl(); 6286 return; 6287 } 6288 6289 QualType Ty = VD->getType(); 6290 if (Ty->isDependentType()) return; 6291 6292 // Require a complete type. 6293 if (RequireCompleteType(VD->getLocation(), 6294 Context.getBaseElementType(Ty), 6295 diag::err_typecheck_decl_incomplete_type)) { 6296 VD->setInvalidDecl(); 6297 return; 6298 } 6299 6300 // Require an abstract type. 6301 if (RequireNonAbstractType(VD->getLocation(), Ty, 6302 diag::err_abstract_type_in_decl, 6303 AbstractVariableType)) { 6304 VD->setInvalidDecl(); 6305 return; 6306 } 6307 6308 // Don't bother complaining about constructors or destructors, 6309 // though. 6310} 6311 6312void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6313 bool TypeMayContainAuto) { 6314 // If there is no declaration, there was an error parsing it. Just ignore it. 6315 if (RealDecl == 0) 6316 return; 6317 6318 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6319 QualType Type = Var->getType(); 6320 6321 // C++11 [dcl.spec.auto]p3 6322 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6323 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6324 << Var->getDeclName() << Type; 6325 Var->setInvalidDecl(); 6326 return; 6327 } 6328 6329 // C++11 [class.static.data]p3: A static data member can be declared with 6330 // the constexpr specifier; if so, its declaration shall specify 6331 // a brace-or-equal-initializer. 6332 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6333 // the definition of a variable [...] or the declaration of a static data 6334 // member. 6335 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6336 if (Var->isStaticDataMember()) 6337 Diag(Var->getLocation(), 6338 diag::err_constexpr_static_mem_var_requires_init) 6339 << Var->getDeclName(); 6340 else 6341 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6342 Var->setInvalidDecl(); 6343 return; 6344 } 6345 6346 switch (Var->isThisDeclarationADefinition()) { 6347 case VarDecl::Definition: 6348 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6349 break; 6350 6351 // We have an out-of-line definition of a static data member 6352 // that has an in-class initializer, so we type-check this like 6353 // a declaration. 6354 // 6355 // Fall through 6356 6357 case VarDecl::DeclarationOnly: 6358 // It's only a declaration. 6359 6360 // Block scope. C99 6.7p7: If an identifier for an object is 6361 // declared with no linkage (C99 6.2.2p6), the type for the 6362 // object shall be complete. 6363 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6364 !Var->getLinkage() && !Var->isInvalidDecl() && 6365 RequireCompleteType(Var->getLocation(), Type, 6366 diag::err_typecheck_decl_incomplete_type)) 6367 Var->setInvalidDecl(); 6368 6369 // Make sure that the type is not abstract. 6370 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6371 RequireNonAbstractType(Var->getLocation(), Type, 6372 diag::err_abstract_type_in_decl, 6373 AbstractVariableType)) 6374 Var->setInvalidDecl(); 6375 return; 6376 6377 case VarDecl::TentativeDefinition: 6378 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6379 // object that has file scope without an initializer, and without a 6380 // storage-class specifier or with the storage-class specifier "static", 6381 // constitutes a tentative definition. Note: A tentative definition with 6382 // external linkage is valid (C99 6.2.2p5). 6383 if (!Var->isInvalidDecl()) { 6384 if (const IncompleteArrayType *ArrayT 6385 = Context.getAsIncompleteArrayType(Type)) { 6386 if (RequireCompleteType(Var->getLocation(), 6387 ArrayT->getElementType(), 6388 diag::err_illegal_decl_array_incomplete_type)) 6389 Var->setInvalidDecl(); 6390 } else if (Var->getStorageClass() == SC_Static) { 6391 // C99 6.9.2p3: If the declaration of an identifier for an object is 6392 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6393 // declared type shall not be an incomplete type. 6394 // NOTE: code such as the following 6395 // static struct s; 6396 // struct s { int a; }; 6397 // is accepted by gcc. Hence here we issue a warning instead of 6398 // an error and we do not invalidate the static declaration. 6399 // NOTE: to avoid multiple warnings, only check the first declaration. 6400 if (Var->getPreviousDecl() == 0) 6401 RequireCompleteType(Var->getLocation(), Type, 6402 diag::ext_typecheck_decl_incomplete_type); 6403 } 6404 } 6405 6406 // Record the tentative definition; we're done. 6407 if (!Var->isInvalidDecl()) 6408 TentativeDefinitions.push_back(Var); 6409 return; 6410 } 6411 6412 // Provide a specific diagnostic for uninitialized variable 6413 // definitions with incomplete array type. 6414 if (Type->isIncompleteArrayType()) { 6415 Diag(Var->getLocation(), 6416 diag::err_typecheck_incomplete_array_needs_initializer); 6417 Var->setInvalidDecl(); 6418 return; 6419 } 6420 6421 // Provide a specific diagnostic for uninitialized variable 6422 // definitions with reference type. 6423 if (Type->isReferenceType()) { 6424 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6425 << Var->getDeclName() 6426 << SourceRange(Var->getLocation(), Var->getLocation()); 6427 Var->setInvalidDecl(); 6428 return; 6429 } 6430 6431 // Do not attempt to type-check the default initializer for a 6432 // variable with dependent type. 6433 if (Type->isDependentType()) 6434 return; 6435 6436 if (Var->isInvalidDecl()) 6437 return; 6438 6439 if (RequireCompleteType(Var->getLocation(), 6440 Context.getBaseElementType(Type), 6441 diag::err_typecheck_decl_incomplete_type)) { 6442 Var->setInvalidDecl(); 6443 return; 6444 } 6445 6446 // The variable can not have an abstract class type. 6447 if (RequireNonAbstractType(Var->getLocation(), Type, 6448 diag::err_abstract_type_in_decl, 6449 AbstractVariableType)) { 6450 Var->setInvalidDecl(); 6451 return; 6452 } 6453 6454 // Check for jumps past the implicit initializer. C++0x 6455 // clarifies that this applies to a "variable with automatic 6456 // storage duration", not a "local variable". 6457 // C++11 [stmt.dcl]p3 6458 // A program that jumps from a point where a variable with automatic 6459 // storage duration is not in scope to a point where it is in scope is 6460 // ill-formed unless the variable has scalar type, class type with a 6461 // trivial default constructor and a trivial destructor, a cv-qualified 6462 // version of one of these types, or an array of one of the preceding 6463 // types and is declared without an initializer. 6464 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6465 if (const RecordType *Record 6466 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6467 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6468 // Mark the function for further checking even if the looser rules of 6469 // C++11 do not require such checks, so that we can diagnose 6470 // incompatibilities with C++98. 6471 if (!CXXRecord->isPOD()) 6472 getCurFunction()->setHasBranchProtectedScope(); 6473 } 6474 } 6475 6476 // C++03 [dcl.init]p9: 6477 // If no initializer is specified for an object, and the 6478 // object is of (possibly cv-qualified) non-POD class type (or 6479 // array thereof), the object shall be default-initialized; if 6480 // the object is of const-qualified type, the underlying class 6481 // type shall have a user-declared default 6482 // constructor. Otherwise, if no initializer is specified for 6483 // a non- static object, the object and its subobjects, if 6484 // any, have an indeterminate initial value); if the object 6485 // or any of its subobjects are of const-qualified type, the 6486 // program is ill-formed. 6487 // C++0x [dcl.init]p11: 6488 // If no initializer is specified for an object, the object is 6489 // default-initialized; [...]. 6490 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6491 InitializationKind Kind 6492 = InitializationKind::CreateDefault(Var->getLocation()); 6493 6494 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6495 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6496 MultiExprArg(*this, 0, 0)); 6497 if (Init.isInvalid()) 6498 Var->setInvalidDecl(); 6499 else if (Init.get()) 6500 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6501 6502 CheckCompleteVariableDeclaration(Var); 6503 } 6504} 6505 6506void Sema::ActOnCXXForRangeDecl(Decl *D) { 6507 VarDecl *VD = dyn_cast<VarDecl>(D); 6508 if (!VD) { 6509 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6510 D->setInvalidDecl(); 6511 return; 6512 } 6513 6514 VD->setCXXForRangeDecl(true); 6515 6516 // for-range-declaration cannot be given a storage class specifier. 6517 int Error = -1; 6518 switch (VD->getStorageClassAsWritten()) { 6519 case SC_None: 6520 break; 6521 case SC_Extern: 6522 Error = 0; 6523 break; 6524 case SC_Static: 6525 Error = 1; 6526 break; 6527 case SC_PrivateExtern: 6528 Error = 2; 6529 break; 6530 case SC_Auto: 6531 Error = 3; 6532 break; 6533 case SC_Register: 6534 Error = 4; 6535 break; 6536 case SC_OpenCLWorkGroupLocal: 6537 llvm_unreachable("Unexpected storage class"); 6538 } 6539 if (VD->isConstexpr()) 6540 Error = 5; 6541 if (Error != -1) { 6542 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6543 << VD->getDeclName() << Error; 6544 D->setInvalidDecl(); 6545 } 6546} 6547 6548void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6549 if (var->isInvalidDecl()) return; 6550 6551 // In ARC, don't allow jumps past the implicit initialization of a 6552 // local retaining variable. 6553 if (getLangOptions().ObjCAutoRefCount && 6554 var->hasLocalStorage()) { 6555 switch (var->getType().getObjCLifetime()) { 6556 case Qualifiers::OCL_None: 6557 case Qualifiers::OCL_ExplicitNone: 6558 case Qualifiers::OCL_Autoreleasing: 6559 break; 6560 6561 case Qualifiers::OCL_Weak: 6562 case Qualifiers::OCL_Strong: 6563 getCurFunction()->setHasBranchProtectedScope(); 6564 break; 6565 } 6566 } 6567 6568 // All the following checks are C++ only. 6569 if (!getLangOptions().CPlusPlus) return; 6570 6571 QualType baseType = Context.getBaseElementType(var->getType()); 6572 if (baseType->isDependentType()) return; 6573 6574 // __block variables might require us to capture a copy-initializer. 6575 if (var->hasAttr<BlocksAttr>()) { 6576 // It's currently invalid to ever have a __block variable with an 6577 // array type; should we diagnose that here? 6578 6579 // Regardless, we don't want to ignore array nesting when 6580 // constructing this copy. 6581 QualType type = var->getType(); 6582 6583 if (type->isStructureOrClassType()) { 6584 SourceLocation poi = var->getLocation(); 6585 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6586 ExprResult result = 6587 PerformCopyInitialization( 6588 InitializedEntity::InitializeBlock(poi, type, false), 6589 poi, Owned(varRef)); 6590 if (!result.isInvalid()) { 6591 result = MaybeCreateExprWithCleanups(result); 6592 Expr *init = result.takeAs<Expr>(); 6593 Context.setBlockVarCopyInits(var, init); 6594 } 6595 } 6596 } 6597 6598 Expr *Init = var->getInit(); 6599 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6600 6601 if (!var->getDeclContext()->isDependentContext() && Init) { 6602 if (IsGlobal && !var->isConstexpr() && 6603 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6604 var->getLocation()) 6605 != DiagnosticsEngine::Ignored && 6606 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 6607 Diag(var->getLocation(), diag::warn_global_constructor) 6608 << Init->getSourceRange(); 6609 6610 if (var->isConstexpr()) { 6611 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 6612 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 6613 SourceLocation DiagLoc = var->getLocation(); 6614 // If the note doesn't add any useful information other than a source 6615 // location, fold it into the primary diagnostic. 6616 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 6617 diag::note_invalid_subexpr_in_const_expr) { 6618 DiagLoc = Notes[0].first; 6619 Notes.clear(); 6620 } 6621 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 6622 << var << Init->getSourceRange(); 6623 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 6624 Diag(Notes[I].first, Notes[I].second); 6625 } 6626 } else if (var->isUsableInConstantExpressions()) { 6627 // Check whether the initializer of a const variable of integral or 6628 // enumeration type is an ICE now, since we can't tell whether it was 6629 // initialized by a constant expression if we check later. 6630 var->checkInitIsICE(); 6631 } 6632 } 6633 6634 // Require the destructor. 6635 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6636 FinalizeVarWithDestructor(var, recordType); 6637} 6638 6639/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6640/// any semantic actions necessary after any initializer has been attached. 6641void 6642Sema::FinalizeDeclaration(Decl *ThisDecl) { 6643 // Note that we are no longer parsing the initializer for this declaration. 6644 ParsingInitForAutoVars.erase(ThisDecl); 6645} 6646 6647Sema::DeclGroupPtrTy 6648Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6649 Decl **Group, unsigned NumDecls) { 6650 SmallVector<Decl*, 8> Decls; 6651 6652 if (DS.isTypeSpecOwned()) 6653 Decls.push_back(DS.getRepAsDecl()); 6654 6655 for (unsigned i = 0; i != NumDecls; ++i) 6656 if (Decl *D = Group[i]) 6657 Decls.push_back(D); 6658 6659 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6660 DS.getTypeSpecType() == DeclSpec::TST_auto); 6661} 6662 6663/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6664/// group, performing any necessary semantic checking. 6665Sema::DeclGroupPtrTy 6666Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6667 bool TypeMayContainAuto) { 6668 // C++0x [dcl.spec.auto]p7: 6669 // If the type deduced for the template parameter U is not the same in each 6670 // deduction, the program is ill-formed. 6671 // FIXME: When initializer-list support is added, a distinction is needed 6672 // between the deduced type U and the deduced type which 'auto' stands for. 6673 // auto a = 0, b = { 1, 2, 3 }; 6674 // is legal because the deduced type U is 'int' in both cases. 6675 if (TypeMayContainAuto && NumDecls > 1) { 6676 QualType Deduced; 6677 CanQualType DeducedCanon; 6678 VarDecl *DeducedDecl = 0; 6679 for (unsigned i = 0; i != NumDecls; ++i) { 6680 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6681 AutoType *AT = D->getType()->getContainedAutoType(); 6682 // Don't reissue diagnostics when instantiating a template. 6683 if (AT && D->isInvalidDecl()) 6684 break; 6685 if (AT && AT->isDeduced()) { 6686 QualType U = AT->getDeducedType(); 6687 CanQualType UCanon = Context.getCanonicalType(U); 6688 if (Deduced.isNull()) { 6689 Deduced = U; 6690 DeducedCanon = UCanon; 6691 DeducedDecl = D; 6692 } else if (DeducedCanon != UCanon) { 6693 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6694 diag::err_auto_different_deductions) 6695 << Deduced << DeducedDecl->getDeclName() 6696 << U << D->getDeclName() 6697 << DeducedDecl->getInit()->getSourceRange() 6698 << D->getInit()->getSourceRange(); 6699 D->setInvalidDecl(); 6700 break; 6701 } 6702 } 6703 } 6704 } 6705 } 6706 6707 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6708} 6709 6710 6711/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6712/// to introduce parameters into function prototype scope. 6713Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6714 const DeclSpec &DS = D.getDeclSpec(); 6715 6716 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6717 // C++03 [dcl.stc]p2 also permits 'auto'. 6718 VarDecl::StorageClass StorageClass = SC_None; 6719 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6720 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6721 StorageClass = SC_Register; 6722 StorageClassAsWritten = SC_Register; 6723 } else if (getLangOptions().CPlusPlus && 6724 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6725 StorageClass = SC_Auto; 6726 StorageClassAsWritten = SC_Auto; 6727 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6728 Diag(DS.getStorageClassSpecLoc(), 6729 diag::err_invalid_storage_class_in_func_decl); 6730 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6731 } 6732 6733 if (D.getDeclSpec().isThreadSpecified()) 6734 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6735 if (D.getDeclSpec().isConstexprSpecified()) 6736 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6737 << 0; 6738 6739 DiagnoseFunctionSpecifiers(D); 6740 6741 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6742 QualType parmDeclType = TInfo->getType(); 6743 6744 if (getLangOptions().CPlusPlus) { 6745 // Check that there are no default arguments inside the type of this 6746 // parameter. 6747 CheckExtraCXXDefaultArguments(D); 6748 6749 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6750 if (D.getCXXScopeSpec().isSet()) { 6751 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6752 << D.getCXXScopeSpec().getRange(); 6753 D.getCXXScopeSpec().clear(); 6754 } 6755 } 6756 6757 // Ensure we have a valid name 6758 IdentifierInfo *II = 0; 6759 if (D.hasName()) { 6760 II = D.getIdentifier(); 6761 if (!II) { 6762 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6763 << GetNameForDeclarator(D).getName().getAsString(); 6764 D.setInvalidType(true); 6765 } 6766 } 6767 6768 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6769 if (II) { 6770 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6771 ForRedeclaration); 6772 LookupName(R, S); 6773 if (R.isSingleResult()) { 6774 NamedDecl *PrevDecl = R.getFoundDecl(); 6775 if (PrevDecl->isTemplateParameter()) { 6776 // Maybe we will complain about the shadowed template parameter. 6777 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6778 // Just pretend that we didn't see the previous declaration. 6779 PrevDecl = 0; 6780 } else if (S->isDeclScope(PrevDecl)) { 6781 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6782 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6783 6784 // Recover by removing the name 6785 II = 0; 6786 D.SetIdentifier(0, D.getIdentifierLoc()); 6787 D.setInvalidType(true); 6788 } 6789 } 6790 } 6791 6792 // Temporarily put parameter variables in the translation unit, not 6793 // the enclosing context. This prevents them from accidentally 6794 // looking like class members in C++. 6795 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6796 D.getSourceRange().getBegin(), 6797 D.getIdentifierLoc(), II, 6798 parmDeclType, TInfo, 6799 StorageClass, StorageClassAsWritten); 6800 6801 if (D.isInvalidType()) 6802 New->setInvalidDecl(); 6803 6804 assert(S->isFunctionPrototypeScope()); 6805 assert(S->getFunctionPrototypeDepth() >= 1); 6806 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6807 S->getNextFunctionPrototypeIndex()); 6808 6809 // Add the parameter declaration into this scope. 6810 S->AddDecl(New); 6811 if (II) 6812 IdResolver.AddDecl(New); 6813 6814 ProcessDeclAttributes(S, New, D); 6815 6816 if (D.getDeclSpec().isModulePrivateSpecified()) 6817 Diag(New->getLocation(), diag::err_module_private_local) 6818 << 1 << New->getDeclName() 6819 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6820 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6821 6822 if (New->hasAttr<BlocksAttr>()) { 6823 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6824 } 6825 return New; 6826} 6827 6828/// \brief Synthesizes a variable for a parameter arising from a 6829/// typedef. 6830ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6831 SourceLocation Loc, 6832 QualType T) { 6833 /* FIXME: setting StartLoc == Loc. 6834 Would it be worth to modify callers so as to provide proper source 6835 location for the unnamed parameters, embedding the parameter's type? */ 6836 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6837 T, Context.getTrivialTypeSourceInfo(T, Loc), 6838 SC_None, SC_None, 0); 6839 Param->setImplicit(); 6840 return Param; 6841} 6842 6843void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6844 ParmVarDecl * const *ParamEnd) { 6845 // Don't diagnose unused-parameter errors in template instantiations; we 6846 // will already have done so in the template itself. 6847 if (!ActiveTemplateInstantiations.empty()) 6848 return; 6849 6850 for (; Param != ParamEnd; ++Param) { 6851 if (!(*Param)->isReferenced() && (*Param)->getDeclName() && 6852 !(*Param)->hasAttr<UnusedAttr>()) { 6853 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6854 << (*Param)->getDeclName(); 6855 } 6856 } 6857} 6858 6859void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6860 ParmVarDecl * const *ParamEnd, 6861 QualType ReturnTy, 6862 NamedDecl *D) { 6863 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6864 return; 6865 6866 // Warn if the return value is pass-by-value and larger than the specified 6867 // threshold. 6868 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 6869 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6870 if (Size > LangOpts.NumLargeByValueCopy) 6871 Diag(D->getLocation(), diag::warn_return_value_size) 6872 << D->getDeclName() << Size; 6873 } 6874 6875 // Warn if any parameter is pass-by-value and larger than the specified 6876 // threshold. 6877 for (; Param != ParamEnd; ++Param) { 6878 QualType T = (*Param)->getType(); 6879 if (T->isDependentType() || !T.isPODType(Context)) 6880 continue; 6881 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6882 if (Size > LangOpts.NumLargeByValueCopy) 6883 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6884 << (*Param)->getDeclName() << Size; 6885 } 6886} 6887 6888ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6889 SourceLocation NameLoc, IdentifierInfo *Name, 6890 QualType T, TypeSourceInfo *TSInfo, 6891 VarDecl::StorageClass StorageClass, 6892 VarDecl::StorageClass StorageClassAsWritten) { 6893 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6894 if (getLangOptions().ObjCAutoRefCount && 6895 T.getObjCLifetime() == Qualifiers::OCL_None && 6896 T->isObjCLifetimeType()) { 6897 6898 Qualifiers::ObjCLifetime lifetime; 6899 6900 // Special cases for arrays: 6901 // - if it's const, use __unsafe_unretained 6902 // - otherwise, it's an error 6903 if (T->isArrayType()) { 6904 if (!T.isConstQualified()) { 6905 DelayedDiagnostics.add( 6906 sema::DelayedDiagnostic::makeForbiddenType( 6907 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6908 } 6909 lifetime = Qualifiers::OCL_ExplicitNone; 6910 } else { 6911 lifetime = T->getObjCARCImplicitLifetime(); 6912 } 6913 T = Context.getLifetimeQualifiedType(T, lifetime); 6914 } 6915 6916 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6917 Context.getAdjustedParameterType(T), 6918 TSInfo, 6919 StorageClass, StorageClassAsWritten, 6920 0); 6921 6922 // Parameters can not be abstract class types. 6923 // For record types, this is done by the AbstractClassUsageDiagnoser once 6924 // the class has been completely parsed. 6925 if (!CurContext->isRecord() && 6926 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6927 AbstractParamType)) 6928 New->setInvalidDecl(); 6929 6930 // Parameter declarators cannot be interface types. All ObjC objects are 6931 // passed by reference. 6932 if (T->isObjCObjectType()) { 6933 Diag(NameLoc, 6934 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6935 << FixItHint::CreateInsertion(NameLoc, "*"); 6936 T = Context.getObjCObjectPointerType(T); 6937 New->setType(T); 6938 } 6939 6940 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6941 // duration shall not be qualified by an address-space qualifier." 6942 // Since all parameters have automatic store duration, they can not have 6943 // an address space. 6944 if (T.getAddressSpace() != 0) { 6945 Diag(NameLoc, diag::err_arg_with_address_space); 6946 New->setInvalidDecl(); 6947 } 6948 6949 return New; 6950} 6951 6952void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6953 SourceLocation LocAfterDecls) { 6954 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6955 6956 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6957 // for a K&R function. 6958 if (!FTI.hasPrototype) { 6959 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6960 --i; 6961 if (FTI.ArgInfo[i].Param == 0) { 6962 SmallString<256> Code; 6963 llvm::raw_svector_ostream(Code) << " int " 6964 << FTI.ArgInfo[i].Ident->getName() 6965 << ";\n"; 6966 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6967 << FTI.ArgInfo[i].Ident 6968 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6969 6970 // Implicitly declare the argument as type 'int' for lack of a better 6971 // type. 6972 AttributeFactory attrs; 6973 DeclSpec DS(attrs); 6974 const char* PrevSpec; // unused 6975 unsigned DiagID; // unused 6976 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6977 PrevSpec, DiagID); 6978 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6979 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6980 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6981 } 6982 } 6983 } 6984} 6985 6986Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6987 Declarator &D) { 6988 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6989 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6990 Scope *ParentScope = FnBodyScope->getParent(); 6991 6992 D.setFunctionDefinitionKind(FDK_Definition); 6993 Decl *DP = HandleDeclarator(ParentScope, D, 6994 MultiTemplateParamsArg(*this)); 6995 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6996} 6997 6998static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6999 // Don't warn about invalid declarations. 7000 if (FD->isInvalidDecl()) 7001 return false; 7002 7003 // Or declarations that aren't global. 7004 if (!FD->isGlobal()) 7005 return false; 7006 7007 // Don't warn about C++ member functions. 7008 if (isa<CXXMethodDecl>(FD)) 7009 return false; 7010 7011 // Don't warn about 'main'. 7012 if (FD->isMain()) 7013 return false; 7014 7015 // Don't warn about inline functions. 7016 if (FD->isInlined()) 7017 return false; 7018 7019 // Don't warn about function templates. 7020 if (FD->getDescribedFunctionTemplate()) 7021 return false; 7022 7023 // Don't warn about function template specializations. 7024 if (FD->isFunctionTemplateSpecialization()) 7025 return false; 7026 7027 bool MissingPrototype = true; 7028 for (const FunctionDecl *Prev = FD->getPreviousDecl(); 7029 Prev; Prev = Prev->getPreviousDecl()) { 7030 // Ignore any declarations that occur in function or method 7031 // scope, because they aren't visible from the header. 7032 if (Prev->getDeclContext()->isFunctionOrMethod()) 7033 continue; 7034 7035 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 7036 break; 7037 } 7038 7039 return MissingPrototype; 7040} 7041 7042void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 7043 // Don't complain if we're in GNU89 mode and the previous definition 7044 // was an extern inline function. 7045 const FunctionDecl *Definition; 7046 if (FD->isDefined(Definition) && 7047 !canRedefineFunction(Definition, getLangOptions())) { 7048 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 7049 Definition->getStorageClass() == SC_Extern) 7050 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 7051 << FD->getDeclName() << getLangOptions().CPlusPlus; 7052 else 7053 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 7054 Diag(Definition->getLocation(), diag::note_previous_definition); 7055 } 7056} 7057 7058Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 7059 // Clear the last template instantiation error context. 7060 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 7061 7062 if (!D) 7063 return D; 7064 FunctionDecl *FD = 0; 7065 7066 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 7067 FD = FunTmpl->getTemplatedDecl(); 7068 else 7069 FD = cast<FunctionDecl>(D); 7070 7071 // Enter a new function scope 7072 PushFunctionScope(); 7073 7074 // See if this is a redefinition. 7075 if (!FD->isLateTemplateParsed()) 7076 CheckForFunctionRedefinition(FD); 7077 7078 // Builtin functions cannot be defined. 7079 if (unsigned BuiltinID = FD->getBuiltinID()) { 7080 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7081 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7082 FD->setInvalidDecl(); 7083 } 7084 } 7085 7086 // The return type of a function definition must be complete 7087 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7088 QualType ResultType = FD->getResultType(); 7089 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7090 !FD->isInvalidDecl() && 7091 RequireCompleteType(FD->getLocation(), ResultType, 7092 diag::err_func_def_incomplete_result)) 7093 FD->setInvalidDecl(); 7094 7095 // GNU warning -Wmissing-prototypes: 7096 // Warn if a global function is defined without a previous 7097 // prototype declaration. This warning is issued even if the 7098 // definition itself provides a prototype. The aim is to detect 7099 // global functions that fail to be declared in header files. 7100 if (ShouldWarnAboutMissingPrototype(FD)) 7101 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7102 7103 if (FnBodyScope) 7104 PushDeclContext(FnBodyScope, FD); 7105 7106 // Check the validity of our function parameters 7107 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7108 /*CheckParameterNames=*/true); 7109 7110 // Introduce our parameters into the function scope 7111 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7112 ParmVarDecl *Param = FD->getParamDecl(p); 7113 Param->setOwningFunction(FD); 7114 7115 // If this has an identifier, add it to the scope stack. 7116 if (Param->getIdentifier() && FnBodyScope) { 7117 CheckShadow(FnBodyScope, Param); 7118 7119 PushOnScopeChains(Param, FnBodyScope); 7120 } 7121 } 7122 7123 // Checking attributes of current function definition 7124 // dllimport attribute. 7125 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7126 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7127 // dllimport attribute cannot be directly applied to definition. 7128 // Microsoft accepts dllimport for functions defined within class scope. 7129 if (!DA->isInherited() && 7130 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7131 Diag(FD->getLocation(), 7132 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7133 << "dllimport"; 7134 FD->setInvalidDecl(); 7135 return FD; 7136 } 7137 7138 // Visual C++ appears to not think this is an issue, so only issue 7139 // a warning when Microsoft extensions are disabled. 7140 if (!LangOpts.MicrosoftExt) { 7141 // If a symbol previously declared dllimport is later defined, the 7142 // attribute is ignored in subsequent references, and a warning is 7143 // emitted. 7144 Diag(FD->getLocation(), 7145 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7146 << FD->getName() << "dllimport"; 7147 } 7148 } 7149 return FD; 7150} 7151 7152/// \brief Given the set of return statements within a function body, 7153/// compute the variables that are subject to the named return value 7154/// optimization. 7155/// 7156/// Each of the variables that is subject to the named return value 7157/// optimization will be marked as NRVO variables in the AST, and any 7158/// return statement that has a marked NRVO variable as its NRVO candidate can 7159/// use the named return value optimization. 7160/// 7161/// This function applies a very simplistic algorithm for NRVO: if every return 7162/// statement in the function has the same NRVO candidate, that candidate is 7163/// the NRVO variable. 7164/// 7165/// FIXME: Employ a smarter algorithm that accounts for multiple return 7166/// statements and the lifetimes of the NRVO candidates. We should be able to 7167/// find a maximal set of NRVO variables. 7168void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7169 ReturnStmt **Returns = Scope->Returns.data(); 7170 7171 const VarDecl *NRVOCandidate = 0; 7172 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7173 if (!Returns[I]->getNRVOCandidate()) 7174 return; 7175 7176 if (!NRVOCandidate) 7177 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7178 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7179 return; 7180 } 7181 7182 if (NRVOCandidate) 7183 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7184} 7185 7186Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7187 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7188} 7189 7190Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7191 bool IsInstantiation) { 7192 FunctionDecl *FD = 0; 7193 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7194 if (FunTmpl) 7195 FD = FunTmpl->getTemplatedDecl(); 7196 else 7197 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7198 7199 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7200 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7201 7202 if (FD) { 7203 FD->setBody(Body); 7204 if (FD->isMain()) { 7205 // C and C++ allow for main to automagically return 0. 7206 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7207 FD->setHasImplicitReturnZero(true); 7208 WP.disableCheckFallThrough(); 7209 } else if (FD->hasAttr<NakedAttr>()) { 7210 // If the function is marked 'naked', don't complain about missing return 7211 // statements. 7212 WP.disableCheckFallThrough(); 7213 } 7214 7215 // MSVC permits the use of pure specifier (=0) on function definition, 7216 // defined at class scope, warn about this non standard construct. 7217 if (getLangOptions().MicrosoftExt && FD->isPure()) 7218 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7219 7220 if (!FD->isInvalidDecl()) { 7221 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7222 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7223 FD->getResultType(), FD); 7224 7225 // If this is a constructor, we need a vtable. 7226 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7227 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7228 7229 computeNRVO(Body, getCurFunction()); 7230 } 7231 7232 assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) && 7233 "Function parsing confused"); 7234 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7235 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7236 MD->setBody(Body); 7237 if (Body) 7238 MD->setEndLoc(Body->getLocEnd()); 7239 if (!MD->isInvalidDecl()) { 7240 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7241 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7242 MD->getResultType(), MD); 7243 7244 if (Body) 7245 computeNRVO(Body, getCurFunction()); 7246 } 7247 if (ObjCShouldCallSuperDealloc) { 7248 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7249 ObjCShouldCallSuperDealloc = false; 7250 } 7251 if (ObjCShouldCallSuperFinalize) { 7252 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7253 ObjCShouldCallSuperFinalize = false; 7254 } 7255 } else { 7256 return 0; 7257 } 7258 7259 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7260 "ObjC methods, which should have been handled in the block above."); 7261 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7262 "ObjC methods, which should have been handled in the block above."); 7263 7264 // Verify and clean out per-function state. 7265 if (Body) { 7266 // C++ constructors that have function-try-blocks can't have return 7267 // statements in the handlers of that block. (C++ [except.handle]p14) 7268 // Verify this. 7269 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7270 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7271 7272 // Verify that gotos and switch cases don't jump into scopes illegally. 7273 if (getCurFunction()->NeedsScopeChecking() && 7274 !dcl->isInvalidDecl() && 7275 !hasAnyUnrecoverableErrorsInThisFunction()) 7276 DiagnoseInvalidJumps(Body); 7277 7278 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7279 if (!Destructor->getParent()->isDependentType()) 7280 CheckDestructor(Destructor); 7281 7282 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7283 Destructor->getParent()); 7284 } 7285 7286 // If any errors have occurred, clear out any temporaries that may have 7287 // been leftover. This ensures that these temporaries won't be picked up for 7288 // deletion in some later function. 7289 if (PP.getDiagnostics().hasErrorOccurred() || 7290 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7291 DiscardCleanupsInEvaluationContext(); 7292 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7293 // Since the body is valid, issue any analysis-based warnings that are 7294 // enabled. 7295 ActivePolicy = &WP; 7296 } 7297 7298 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7299 !CheckConstexprFunctionBody(FD, Body, IsInstantiation)) 7300 FD->setInvalidDecl(); 7301 7302 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7303 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7304 assert(MaybeODRUseExprs.empty() && 7305 "Leftover expressions for odr-use checking"); 7306 } 7307 7308 if (!IsInstantiation) 7309 PopDeclContext(); 7310 7311 PopFunctionScopeInfo(ActivePolicy, dcl); 7312 7313 // If any errors have occurred, clear out any temporaries that may have 7314 // been leftover. This ensures that these temporaries won't be picked up for 7315 // deletion in some later function. 7316 if (getDiagnostics().hasErrorOccurred()) { 7317 DiscardCleanupsInEvaluationContext(); 7318 } 7319 7320 return dcl; 7321} 7322 7323 7324/// When we finish delayed parsing of an attribute, we must attach it to the 7325/// relevant Decl. 7326void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7327 ParsedAttributes &Attrs) { 7328 // Always attach attributes to the underlying decl. 7329 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) 7330 D = TD->getTemplatedDecl(); 7331 ProcessDeclAttributeList(S, D, Attrs.getList()); 7332} 7333 7334 7335/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7336/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7337NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7338 IdentifierInfo &II, Scope *S) { 7339 // Before we produce a declaration for an implicitly defined 7340 // function, see whether there was a locally-scoped declaration of 7341 // this name as a function or variable. If so, use that 7342 // (non-visible) declaration, and complain about it. 7343 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7344 = findLocallyScopedExternalDecl(&II); 7345 if (Pos != LocallyScopedExternalDecls.end()) { 7346 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7347 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7348 return Pos->second; 7349 } 7350 7351 // Extension in C99. Legal in C90, but warn about it. 7352 unsigned diag_id; 7353 if (II.getName().startswith("__builtin_")) 7354 diag_id = diag::warn_builtin_unknown; 7355 else if (getLangOptions().C99) 7356 diag_id = diag::ext_implicit_function_decl; 7357 else 7358 diag_id = diag::warn_implicit_function_decl; 7359 Diag(Loc, diag_id) << &II; 7360 7361 // Because typo correction is expensive, only do it if the implicit 7362 // function declaration is going to be treated as an error. 7363 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7364 TypoCorrection Corrected; 7365 DeclFilterCCC<FunctionDecl> Validator; 7366 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7367 LookupOrdinaryName, S, 0, Validator))) { 7368 std::string CorrectedStr = Corrected.getAsString(getLangOptions()); 7369 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOptions()); 7370 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>(); 7371 7372 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7373 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7374 7375 if (Func->getLocation().isValid() 7376 && !II.getName().startswith("__builtin_")) 7377 Diag(Func->getLocation(), diag::note_previous_decl) 7378 << CorrectedQuotedStr; 7379 } 7380 } 7381 7382 // Set a Declarator for the implicit definition: int foo(); 7383 const char *Dummy; 7384 AttributeFactory attrFactory; 7385 DeclSpec DS(attrFactory); 7386 unsigned DiagID; 7387 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7388 (void)Error; // Silence warning. 7389 assert(!Error && "Error setting up implicit decl!"); 7390 Declarator D(DS, Declarator::BlockContext); 7391 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7392 0, 0, true, SourceLocation(), 7393 SourceLocation(), SourceLocation(), 7394 SourceLocation(), 7395 EST_None, SourceLocation(), 7396 0, 0, 0, 0, Loc, Loc, D), 7397 DS.getAttributes(), 7398 SourceLocation()); 7399 D.SetIdentifier(&II, Loc); 7400 7401 // Insert this function into translation-unit scope. 7402 7403 DeclContext *PrevDC = CurContext; 7404 CurContext = Context.getTranslationUnitDecl(); 7405 7406 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7407 FD->setImplicit(); 7408 7409 CurContext = PrevDC; 7410 7411 AddKnownFunctionAttributes(FD); 7412 7413 return FD; 7414} 7415 7416/// \brief Adds any function attributes that we know a priori based on 7417/// the declaration of this function. 7418/// 7419/// These attributes can apply both to implicitly-declared builtins 7420/// (like __builtin___printf_chk) or to library-declared functions 7421/// like NSLog or printf. 7422/// 7423/// We need to check for duplicate attributes both here and where user-written 7424/// attributes are applied to declarations. 7425void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7426 if (FD->isInvalidDecl()) 7427 return; 7428 7429 // If this is a built-in function, map its builtin attributes to 7430 // actual attributes. 7431 if (unsigned BuiltinID = FD->getBuiltinID()) { 7432 // Handle printf-formatting attributes. 7433 unsigned FormatIdx; 7434 bool HasVAListArg; 7435 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7436 if (!FD->getAttr<FormatAttr>()) { 7437 const char *fmt = "printf"; 7438 unsigned int NumParams = FD->getNumParams(); 7439 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf) 7440 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType()) 7441 fmt = "NSString"; 7442 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7443 fmt, FormatIdx+1, 7444 HasVAListArg ? 0 : FormatIdx+2)); 7445 } 7446 } 7447 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7448 HasVAListArg)) { 7449 if (!FD->getAttr<FormatAttr>()) 7450 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7451 "scanf", FormatIdx+1, 7452 HasVAListArg ? 0 : FormatIdx+2)); 7453 } 7454 7455 // Mark const if we don't care about errno and that is the only 7456 // thing preventing the function from being const. This allows 7457 // IRgen to use LLVM intrinsics for such functions. 7458 if (!getLangOptions().MathErrno && 7459 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7460 if (!FD->getAttr<ConstAttr>()) 7461 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7462 } 7463 7464 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7465 !FD->getAttr<ReturnsTwiceAttr>()) 7466 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7467 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7468 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7469 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7470 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7471 } 7472 7473 IdentifierInfo *Name = FD->getIdentifier(); 7474 if (!Name) 7475 return; 7476 if ((!getLangOptions().CPlusPlus && 7477 FD->getDeclContext()->isTranslationUnit()) || 7478 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7479 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7480 LinkageSpecDecl::lang_c)) { 7481 // Okay: this could be a libc/libm/Objective-C function we know 7482 // about. 7483 } else 7484 return; 7485 7486 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7487 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7488 // target-specific builtins, perhaps? 7489 if (!FD->getAttr<FormatAttr>()) 7490 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7491 "printf", 2, 7492 Name->isStr("vasprintf") ? 0 : 3)); 7493 } 7494} 7495 7496TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7497 TypeSourceInfo *TInfo) { 7498 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7499 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7500 7501 if (!TInfo) { 7502 assert(D.isInvalidType() && "no declarator info for valid type"); 7503 TInfo = Context.getTrivialTypeSourceInfo(T); 7504 } 7505 7506 // Scope manipulation handled by caller. 7507 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7508 D.getSourceRange().getBegin(), 7509 D.getIdentifierLoc(), 7510 D.getIdentifier(), 7511 TInfo); 7512 7513 // Bail out immediately if we have an invalid declaration. 7514 if (D.isInvalidType()) { 7515 NewTD->setInvalidDecl(); 7516 return NewTD; 7517 } 7518 7519 if (D.getDeclSpec().isModulePrivateSpecified()) { 7520 if (CurContext->isFunctionOrMethod()) 7521 Diag(NewTD->getLocation(), diag::err_module_private_local) 7522 << 2 << NewTD->getDeclName() 7523 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7524 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7525 else 7526 NewTD->setModulePrivate(); 7527 } 7528 7529 // C++ [dcl.typedef]p8: 7530 // If the typedef declaration defines an unnamed class (or 7531 // enum), the first typedef-name declared by the declaration 7532 // to be that class type (or enum type) is used to denote the 7533 // class type (or enum type) for linkage purposes only. 7534 // We need to check whether the type was declared in the declaration. 7535 switch (D.getDeclSpec().getTypeSpecType()) { 7536 case TST_enum: 7537 case TST_struct: 7538 case TST_union: 7539 case TST_class: { 7540 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7541 7542 // Do nothing if the tag is not anonymous or already has an 7543 // associated typedef (from an earlier typedef in this decl group). 7544 if (tagFromDeclSpec->getIdentifier()) break; 7545 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7546 7547 // A well-formed anonymous tag must always be a TUK_Definition. 7548 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7549 7550 // The type must match the tag exactly; no qualifiers allowed. 7551 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7552 break; 7553 7554 // Otherwise, set this is the anon-decl typedef for the tag. 7555 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7556 break; 7557 } 7558 7559 default: 7560 break; 7561 } 7562 7563 return NewTD; 7564} 7565 7566 7567/// \brief Determine whether a tag with a given kind is acceptable 7568/// as a redeclaration of the given tag declaration. 7569/// 7570/// \returns true if the new tag kind is acceptable, false otherwise. 7571bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7572 TagTypeKind NewTag, bool isDefinition, 7573 SourceLocation NewTagLoc, 7574 const IdentifierInfo &Name) { 7575 // C++ [dcl.type.elab]p3: 7576 // The class-key or enum keyword present in the 7577 // elaborated-type-specifier shall agree in kind with the 7578 // declaration to which the name in the elaborated-type-specifier 7579 // refers. This rule also applies to the form of 7580 // elaborated-type-specifier that declares a class-name or 7581 // friend class since it can be construed as referring to the 7582 // definition of the class. Thus, in any 7583 // elaborated-type-specifier, the enum keyword shall be used to 7584 // refer to an enumeration (7.2), the union class-key shall be 7585 // used to refer to a union (clause 9), and either the class or 7586 // struct class-key shall be used to refer to a class (clause 9) 7587 // declared using the class or struct class-key. 7588 TagTypeKind OldTag = Previous->getTagKind(); 7589 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7590 if (OldTag == NewTag) 7591 return true; 7592 7593 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7594 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7595 // Warn about the struct/class tag mismatch. 7596 bool isTemplate = false; 7597 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7598 isTemplate = Record->getDescribedClassTemplate(); 7599 7600 if (!ActiveTemplateInstantiations.empty()) { 7601 // In a template instantiation, do not offer fix-its for tag mismatches 7602 // since they usually mess up the template instead of fixing the problem. 7603 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7604 << (NewTag == TTK_Class) << isTemplate << &Name; 7605 return true; 7606 } 7607 7608 if (isDefinition) { 7609 // On definitions, check previous tags and issue a fix-it for each 7610 // one that doesn't match the current tag. 7611 if (Previous->getDefinition()) { 7612 // Don't suggest fix-its for redefinitions. 7613 return true; 7614 } 7615 7616 bool previousMismatch = false; 7617 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7618 E(Previous->redecls_end()); I != E; ++I) { 7619 if (I->getTagKind() != NewTag) { 7620 if (!previousMismatch) { 7621 previousMismatch = true; 7622 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7623 << (NewTag == TTK_Class) << isTemplate << &Name; 7624 } 7625 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7626 << (NewTag == TTK_Class) 7627 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7628 NewTag == TTK_Class? 7629 "class" : "struct"); 7630 } 7631 } 7632 return true; 7633 } 7634 7635 // Check for a previous definition. If current tag and definition 7636 // are same type, do nothing. If no definition, but disagree with 7637 // with previous tag type, give a warning, but no fix-it. 7638 const TagDecl *Redecl = Previous->getDefinition() ? 7639 Previous->getDefinition() : Previous; 7640 if (Redecl->getTagKind() == NewTag) { 7641 return true; 7642 } 7643 7644 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7645 << (NewTag == TTK_Class) 7646 << isTemplate << &Name; 7647 Diag(Redecl->getLocation(), diag::note_previous_use); 7648 7649 // If there is a previous defintion, suggest a fix-it. 7650 if (Previous->getDefinition()) { 7651 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7652 << (Redecl->getTagKind() == TTK_Class) 7653 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7654 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7655 } 7656 7657 return true; 7658 } 7659 return false; 7660} 7661 7662/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7663/// former case, Name will be non-null. In the later case, Name will be null. 7664/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7665/// reference/declaration/definition of a tag. 7666Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7667 SourceLocation KWLoc, CXXScopeSpec &SS, 7668 IdentifierInfo *Name, SourceLocation NameLoc, 7669 AttributeList *Attr, AccessSpecifier AS, 7670 SourceLocation ModulePrivateLoc, 7671 MultiTemplateParamsArg TemplateParameterLists, 7672 bool &OwnedDecl, bool &IsDependent, 7673 SourceLocation ScopedEnumKWLoc, 7674 bool ScopedEnumUsesClassTag, 7675 TypeResult UnderlyingType) { 7676 // If this is not a definition, it must have a name. 7677 assert((Name != 0 || TUK == TUK_Definition) && 7678 "Nameless record must be a definition!"); 7679 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7680 7681 OwnedDecl = false; 7682 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7683 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 7684 7685 // FIXME: Check explicit specializations more carefully. 7686 bool isExplicitSpecialization = false; 7687 bool Invalid = false; 7688 7689 // We only need to do this matching if we have template parameters 7690 // or a scope specifier, which also conveniently avoids this work 7691 // for non-C++ cases. 7692 if (TemplateParameterLists.size() > 0 || 7693 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7694 if (TemplateParameterList *TemplateParams 7695 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7696 TemplateParameterLists.get(), 7697 TemplateParameterLists.size(), 7698 TUK == TUK_Friend, 7699 isExplicitSpecialization, 7700 Invalid)) { 7701 if (TemplateParams->size() > 0) { 7702 // This is a declaration or definition of a class template (which may 7703 // be a member of another template). 7704 7705 if (Invalid) 7706 return 0; 7707 7708 OwnedDecl = false; 7709 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7710 SS, Name, NameLoc, Attr, 7711 TemplateParams, AS, 7712 ModulePrivateLoc, 7713 TemplateParameterLists.size() - 1, 7714 (TemplateParameterList**) TemplateParameterLists.release()); 7715 return Result.get(); 7716 } else { 7717 // The "template<>" header is extraneous. 7718 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7719 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7720 isExplicitSpecialization = true; 7721 } 7722 } 7723 } 7724 7725 // Figure out the underlying type if this a enum declaration. We need to do 7726 // this early, because it's needed to detect if this is an incompatible 7727 // redeclaration. 7728 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7729 7730 if (Kind == TTK_Enum) { 7731 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7732 // No underlying type explicitly specified, or we failed to parse the 7733 // type, default to int. 7734 EnumUnderlying = Context.IntTy.getTypePtr(); 7735 else if (UnderlyingType.get()) { 7736 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7737 // integral type; any cv-qualification is ignored. 7738 TypeSourceInfo *TI = 0; 7739 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7740 EnumUnderlying = TI; 7741 7742 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7743 7744 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7745 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7746 << T; 7747 // Recover by falling back to int. 7748 EnumUnderlying = Context.IntTy.getTypePtr(); 7749 } 7750 7751 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7752 UPPC_FixedUnderlyingType)) 7753 EnumUnderlying = Context.IntTy.getTypePtr(); 7754 7755 } else if (getLangOptions().MicrosoftExt) 7756 // Microsoft enums are always of int type. 7757 EnumUnderlying = Context.IntTy.getTypePtr(); 7758 } 7759 7760 DeclContext *SearchDC = CurContext; 7761 DeclContext *DC = CurContext; 7762 bool isStdBadAlloc = false; 7763 7764 RedeclarationKind Redecl = ForRedeclaration; 7765 if (TUK == TUK_Friend || TUK == TUK_Reference) 7766 Redecl = NotForRedeclaration; 7767 7768 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7769 7770 if (Name && SS.isNotEmpty()) { 7771 // We have a nested-name tag ('struct foo::bar'). 7772 7773 // Check for invalid 'foo::'. 7774 if (SS.isInvalid()) { 7775 Name = 0; 7776 goto CreateNewDecl; 7777 } 7778 7779 // If this is a friend or a reference to a class in a dependent 7780 // context, don't try to make a decl for it. 7781 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7782 DC = computeDeclContext(SS, false); 7783 if (!DC) { 7784 IsDependent = true; 7785 return 0; 7786 } 7787 } else { 7788 DC = computeDeclContext(SS, true); 7789 if (!DC) { 7790 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7791 << SS.getRange(); 7792 return 0; 7793 } 7794 } 7795 7796 if (RequireCompleteDeclContext(SS, DC)) 7797 return 0; 7798 7799 SearchDC = DC; 7800 // Look-up name inside 'foo::'. 7801 LookupQualifiedName(Previous, DC); 7802 7803 if (Previous.isAmbiguous()) 7804 return 0; 7805 7806 if (Previous.empty()) { 7807 // Name lookup did not find anything. However, if the 7808 // nested-name-specifier refers to the current instantiation, 7809 // and that current instantiation has any dependent base 7810 // classes, we might find something at instantiation time: treat 7811 // this as a dependent elaborated-type-specifier. 7812 // But this only makes any sense for reference-like lookups. 7813 if (Previous.wasNotFoundInCurrentInstantiation() && 7814 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7815 IsDependent = true; 7816 return 0; 7817 } 7818 7819 // A tag 'foo::bar' must already exist. 7820 Diag(NameLoc, diag::err_not_tag_in_scope) 7821 << Kind << Name << DC << SS.getRange(); 7822 Name = 0; 7823 Invalid = true; 7824 goto CreateNewDecl; 7825 } 7826 } else if (Name) { 7827 // If this is a named struct, check to see if there was a previous forward 7828 // declaration or definition. 7829 // FIXME: We're looking into outer scopes here, even when we 7830 // shouldn't be. Doing so can result in ambiguities that we 7831 // shouldn't be diagnosing. 7832 LookupName(Previous, S); 7833 7834 if (Previous.isAmbiguous() && 7835 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7836 LookupResult::Filter F = Previous.makeFilter(); 7837 while (F.hasNext()) { 7838 NamedDecl *ND = F.next(); 7839 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7840 F.erase(); 7841 } 7842 F.done(); 7843 } 7844 7845 // Note: there used to be some attempt at recovery here. 7846 if (Previous.isAmbiguous()) 7847 return 0; 7848 7849 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7850 // FIXME: This makes sure that we ignore the contexts associated 7851 // with C structs, unions, and enums when looking for a matching 7852 // tag declaration or definition. See the similar lookup tweak 7853 // in Sema::LookupName; is there a better way to deal with this? 7854 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7855 SearchDC = SearchDC->getParent(); 7856 } 7857 } else if (S->isFunctionPrototypeScope()) { 7858 // If this is an enum declaration in function prototype scope, set its 7859 // initial context to the translation unit. 7860 SearchDC = Context.getTranslationUnitDecl(); 7861 } 7862 7863 if (Previous.isSingleResult() && 7864 Previous.getFoundDecl()->isTemplateParameter()) { 7865 // Maybe we will complain about the shadowed template parameter. 7866 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7867 // Just pretend that we didn't see the previous declaration. 7868 Previous.clear(); 7869 } 7870 7871 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7872 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7873 // This is a declaration of or a reference to "std::bad_alloc". 7874 isStdBadAlloc = true; 7875 7876 if (Previous.empty() && StdBadAlloc) { 7877 // std::bad_alloc has been implicitly declared (but made invisible to 7878 // name lookup). Fill in this implicit declaration as the previous 7879 // declaration, so that the declarations get chained appropriately. 7880 Previous.addDecl(getStdBadAlloc()); 7881 } 7882 } 7883 7884 // If we didn't find a previous declaration, and this is a reference 7885 // (or friend reference), move to the correct scope. In C++, we 7886 // also need to do a redeclaration lookup there, just in case 7887 // there's a shadow friend decl. 7888 if (Name && Previous.empty() && 7889 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7890 if (Invalid) goto CreateNewDecl; 7891 assert(SS.isEmpty()); 7892 7893 if (TUK == TUK_Reference) { 7894 // C++ [basic.scope.pdecl]p5: 7895 // -- for an elaborated-type-specifier of the form 7896 // 7897 // class-key identifier 7898 // 7899 // if the elaborated-type-specifier is used in the 7900 // decl-specifier-seq or parameter-declaration-clause of a 7901 // function defined in namespace scope, the identifier is 7902 // declared as a class-name in the namespace that contains 7903 // the declaration; otherwise, except as a friend 7904 // declaration, the identifier is declared in the smallest 7905 // non-class, non-function-prototype scope that contains the 7906 // declaration. 7907 // 7908 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7909 // C structs and unions. 7910 // 7911 // It is an error in C++ to declare (rather than define) an enum 7912 // type, including via an elaborated type specifier. We'll 7913 // diagnose that later; for now, declare the enum in the same 7914 // scope as we would have picked for any other tag type. 7915 // 7916 // GNU C also supports this behavior as part of its incomplete 7917 // enum types extension, while GNU C++ does not. 7918 // 7919 // Find the context where we'll be declaring the tag. 7920 // FIXME: We would like to maintain the current DeclContext as the 7921 // lexical context, 7922 while (SearchDC->isRecord() || SearchDC->isTransparentContext() || 7923 SearchDC->isObjCContainer()) 7924 SearchDC = SearchDC->getParent(); 7925 7926 // Find the scope where we'll be declaring the tag. 7927 while (S->isClassScope() || 7928 (getLangOptions().CPlusPlus && 7929 S->isFunctionPrototypeScope()) || 7930 ((S->getFlags() & Scope::DeclScope) == 0) || 7931 (S->getEntity() && 7932 ((DeclContext *)S->getEntity())->isTransparentContext())) 7933 S = S->getParent(); 7934 } else { 7935 assert(TUK == TUK_Friend); 7936 // C++ [namespace.memdef]p3: 7937 // If a friend declaration in a non-local class first declares a 7938 // class or function, the friend class or function is a member of 7939 // the innermost enclosing namespace. 7940 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7941 } 7942 7943 // In C++, we need to do a redeclaration lookup to properly 7944 // diagnose some problems. 7945 if (getLangOptions().CPlusPlus) { 7946 Previous.setRedeclarationKind(ForRedeclaration); 7947 LookupQualifiedName(Previous, SearchDC); 7948 } 7949 } 7950 7951 if (!Previous.empty()) { 7952 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7953 7954 // It's okay to have a tag decl in the same scope as a typedef 7955 // which hides a tag decl in the same scope. Finding this 7956 // insanity with a redeclaration lookup can only actually happen 7957 // in C++. 7958 // 7959 // This is also okay for elaborated-type-specifiers, which is 7960 // technically forbidden by the current standard but which is 7961 // okay according to the likely resolution of an open issue; 7962 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7963 if (getLangOptions().CPlusPlus) { 7964 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7965 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7966 TagDecl *Tag = TT->getDecl(); 7967 if (Tag->getDeclName() == Name && 7968 Tag->getDeclContext()->getRedeclContext() 7969 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7970 PrevDecl = Tag; 7971 Previous.clear(); 7972 Previous.addDecl(Tag); 7973 Previous.resolveKind(); 7974 } 7975 } 7976 } 7977 } 7978 7979 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7980 // If this is a use of a previous tag, or if the tag is already declared 7981 // in the same scope (so that the definition/declaration completes or 7982 // rementions the tag), reuse the decl. 7983 if (TUK == TUK_Reference || TUK == TUK_Friend || 7984 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7985 // Make sure that this wasn't declared as an enum and now used as a 7986 // struct or something similar. 7987 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7988 TUK == TUK_Definition, KWLoc, 7989 *Name)) { 7990 bool SafeToContinue 7991 = (PrevTagDecl->getTagKind() != TTK_Enum && 7992 Kind != TTK_Enum); 7993 if (SafeToContinue) 7994 Diag(KWLoc, diag::err_use_with_wrong_tag) 7995 << Name 7996 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7997 PrevTagDecl->getKindName()); 7998 else 7999 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 8000 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8001 8002 if (SafeToContinue) 8003 Kind = PrevTagDecl->getTagKind(); 8004 else { 8005 // Recover by making this an anonymous redefinition. 8006 Name = 0; 8007 Previous.clear(); 8008 Invalid = true; 8009 } 8010 } 8011 8012 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 8013 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 8014 8015 // If this is an elaborated-type-specifier for a scoped enumeration, 8016 // the 'class' keyword is not necessary and not permitted. 8017 if (TUK == TUK_Reference || TUK == TUK_Friend) { 8018 if (ScopedEnum) 8019 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 8020 << PrevEnum->isScoped() 8021 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 8022 return PrevTagDecl; 8023 } 8024 8025 // All conflicts with previous declarations are recovered by 8026 // returning the previous declaration. 8027 if (ScopedEnum != PrevEnum->isScoped()) { 8028 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 8029 << PrevEnum->isScoped(); 8030 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8031 return PrevTagDecl; 8032 } 8033 else if (EnumUnderlying && PrevEnum->isFixed()) { 8034 QualType T; 8035 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8036 T = TI->getType(); 8037 else 8038 T = QualType(EnumUnderlying.get<const Type*>(), 0); 8039 8040 if (!Context.hasSameUnqualifiedType(T, 8041 PrevEnum->getIntegerType())) { 8042 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 8043 diag::err_enum_redeclare_type_mismatch) 8044 << T 8045 << PrevEnum->getIntegerType(); 8046 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8047 return PrevTagDecl; 8048 } 8049 } 8050 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 8051 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 8052 << PrevEnum->isFixed(); 8053 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8054 return PrevTagDecl; 8055 } 8056 } 8057 8058 if (!Invalid) { 8059 // If this is a use, just return the declaration we found. 8060 8061 // FIXME: In the future, return a variant or some other clue 8062 // for the consumer of this Decl to know it doesn't own it. 8063 // For our current ASTs this shouldn't be a problem, but will 8064 // need to be changed with DeclGroups. 8065 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 8066 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 8067 return PrevTagDecl; 8068 8069 // Diagnose attempts to redefine a tag. 8070 if (TUK == TUK_Definition) { 8071 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 8072 // If we're defining a specialization and the previous definition 8073 // is from an implicit instantiation, don't emit an error 8074 // here; we'll catch this in the general case below. 8075 if (!isExplicitSpecialization || 8076 !isa<CXXRecordDecl>(Def) || 8077 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 8078 == TSK_ExplicitSpecialization) { 8079 Diag(NameLoc, diag::err_redefinition) << Name; 8080 Diag(Def->getLocation(), diag::note_previous_definition); 8081 // If this is a redefinition, recover by making this 8082 // struct be anonymous, which will make any later 8083 // references get the previous definition. 8084 Name = 0; 8085 Previous.clear(); 8086 Invalid = true; 8087 } 8088 } else { 8089 // If the type is currently being defined, complain 8090 // about a nested redefinition. 8091 const TagType *Tag 8092 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8093 if (Tag->isBeingDefined()) { 8094 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8095 Diag(PrevTagDecl->getLocation(), 8096 diag::note_previous_definition); 8097 Name = 0; 8098 Previous.clear(); 8099 Invalid = true; 8100 } 8101 } 8102 8103 // Okay, this is definition of a previously declared or referenced 8104 // tag PrevDecl. We're going to create a new Decl for it. 8105 } 8106 } 8107 // If we get here we have (another) forward declaration or we 8108 // have a definition. Just create a new decl. 8109 8110 } else { 8111 // If we get here, this is a definition of a new tag type in a nested 8112 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8113 // new decl/type. We set PrevDecl to NULL so that the entities 8114 // have distinct types. 8115 Previous.clear(); 8116 } 8117 // If we get here, we're going to create a new Decl. If PrevDecl 8118 // is non-NULL, it's a definition of the tag declared by 8119 // PrevDecl. If it's NULL, we have a new definition. 8120 8121 8122 // Otherwise, PrevDecl is not a tag, but was found with tag 8123 // lookup. This is only actually possible in C++, where a few 8124 // things like templates still live in the tag namespace. 8125 } else { 8126 // Use a better diagnostic if an elaborated-type-specifier 8127 // found the wrong kind of type on the first 8128 // (non-redeclaration) lookup. 8129 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8130 !Previous.isForRedeclaration()) { 8131 unsigned Kind = 0; 8132 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8133 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8134 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8135 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8136 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8137 Invalid = true; 8138 8139 // Otherwise, only diagnose if the declaration is in scope. 8140 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8141 isExplicitSpecialization)) { 8142 // do nothing 8143 8144 // Diagnose implicit declarations introduced by elaborated types. 8145 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8146 unsigned Kind = 0; 8147 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8148 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8149 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8150 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8151 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8152 Invalid = true; 8153 8154 // Otherwise it's a declaration. Call out a particularly common 8155 // case here. 8156 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8157 unsigned Kind = 0; 8158 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8159 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8160 << Name << Kind << TND->getUnderlyingType(); 8161 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8162 Invalid = true; 8163 8164 // Otherwise, diagnose. 8165 } else { 8166 // The tag name clashes with something else in the target scope, 8167 // issue an error and recover by making this tag be anonymous. 8168 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8169 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8170 Name = 0; 8171 Invalid = true; 8172 } 8173 8174 // The existing declaration isn't relevant to us; we're in a 8175 // new scope, so clear out the previous declaration. 8176 Previous.clear(); 8177 } 8178 } 8179 8180CreateNewDecl: 8181 8182 TagDecl *PrevDecl = 0; 8183 if (Previous.isSingleResult()) 8184 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8185 8186 // If there is an identifier, use the location of the identifier as the 8187 // location of the decl, otherwise use the location of the struct/union 8188 // keyword. 8189 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8190 8191 // Otherwise, create a new declaration. If there is a previous 8192 // declaration of the same entity, the two will be linked via 8193 // PrevDecl. 8194 TagDecl *New; 8195 8196 bool IsForwardReference = false; 8197 if (Kind == TTK_Enum) { 8198 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8199 // enum X { A, B, C } D; D should chain to X. 8200 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8201 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8202 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8203 // If this is an undefined enum, warn. 8204 if (TUK != TUK_Definition && !Invalid) { 8205 TagDecl *Def; 8206 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8207 // C++0x: 7.2p2: opaque-enum-declaration. 8208 // Conflicts are diagnosed above. Do nothing. 8209 } 8210 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8211 Diag(Loc, diag::ext_forward_ref_enum_def) 8212 << New; 8213 Diag(Def->getLocation(), diag::note_previous_definition); 8214 } else { 8215 unsigned DiagID = diag::ext_forward_ref_enum; 8216 if (getLangOptions().MicrosoftExt) 8217 DiagID = diag::ext_ms_forward_ref_enum; 8218 else if (getLangOptions().CPlusPlus) 8219 DiagID = diag::err_forward_ref_enum; 8220 Diag(Loc, DiagID); 8221 8222 // If this is a forward-declared reference to an enumeration, make a 8223 // note of it; we won't actually be introducing the declaration into 8224 // the declaration context. 8225 if (TUK == TUK_Reference) 8226 IsForwardReference = true; 8227 } 8228 } 8229 8230 if (EnumUnderlying) { 8231 EnumDecl *ED = cast<EnumDecl>(New); 8232 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8233 ED->setIntegerTypeSourceInfo(TI); 8234 else 8235 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8236 ED->setPromotionType(ED->getIntegerType()); 8237 } 8238 8239 } else { 8240 // struct/union/class 8241 8242 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8243 // struct X { int A; } D; D should chain to X. 8244 if (getLangOptions().CPlusPlus) { 8245 // FIXME: Look for a way to use RecordDecl for simple structs. 8246 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8247 cast_or_null<CXXRecordDecl>(PrevDecl)); 8248 8249 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8250 StdBadAlloc = cast<CXXRecordDecl>(New); 8251 } else 8252 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8253 cast_or_null<RecordDecl>(PrevDecl)); 8254 } 8255 8256 // Maybe add qualifier info. 8257 if (SS.isNotEmpty()) { 8258 if (SS.isSet()) { 8259 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8260 if (TemplateParameterLists.size() > 0) { 8261 New->setTemplateParameterListsInfo(Context, 8262 TemplateParameterLists.size(), 8263 (TemplateParameterList**) TemplateParameterLists.release()); 8264 } 8265 } 8266 else 8267 Invalid = true; 8268 } 8269 8270 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8271 // Add alignment attributes if necessary; these attributes are checked when 8272 // the ASTContext lays out the structure. 8273 // 8274 // It is important for implementing the correct semantics that this 8275 // happen here (in act on tag decl). The #pragma pack stack is 8276 // maintained as a result of parser callbacks which can occur at 8277 // many points during the parsing of a struct declaration (because 8278 // the #pragma tokens are effectively skipped over during the 8279 // parsing of the struct). 8280 AddAlignmentAttributesForRecord(RD); 8281 8282 AddMsStructLayoutForRecord(RD); 8283 } 8284 8285 if (ModulePrivateLoc.isValid()) { 8286 if (isExplicitSpecialization) 8287 Diag(New->getLocation(), diag::err_module_private_specialization) 8288 << 2 8289 << FixItHint::CreateRemoval(ModulePrivateLoc); 8290 // __module_private__ does not apply to local classes. However, we only 8291 // diagnose this as an error when the declaration specifiers are 8292 // freestanding. Here, we just ignore the __module_private__. 8293 else if (!SearchDC->isFunctionOrMethod()) 8294 New->setModulePrivate(); 8295 } 8296 8297 // If this is a specialization of a member class (of a class template), 8298 // check the specialization. 8299 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8300 Invalid = true; 8301 8302 if (Invalid) 8303 New->setInvalidDecl(); 8304 8305 if (Attr) 8306 ProcessDeclAttributeList(S, New, Attr); 8307 8308 // If we're declaring or defining a tag in function prototype scope 8309 // in C, note that this type can only be used within the function. 8310 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8311 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8312 8313 // Set the lexical context. If the tag has a C++ scope specifier, the 8314 // lexical context will be different from the semantic context. 8315 New->setLexicalDeclContext(CurContext); 8316 8317 // Mark this as a friend decl if applicable. 8318 // In Microsoft mode, a friend declaration also acts as a forward 8319 // declaration so we always pass true to setObjectOfFriendDecl to make 8320 // the tag name visible. 8321 if (TUK == TUK_Friend) 8322 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8323 getLangOptions().MicrosoftExt); 8324 8325 // Set the access specifier. 8326 if (!Invalid && SearchDC->isRecord()) 8327 SetMemberAccessSpecifier(New, PrevDecl, AS); 8328 8329 if (TUK == TUK_Definition) 8330 New->startDefinition(); 8331 8332 // If this has an identifier, add it to the scope stack. 8333 if (TUK == TUK_Friend) { 8334 // We might be replacing an existing declaration in the lookup tables; 8335 // if so, borrow its access specifier. 8336 if (PrevDecl) 8337 New->setAccess(PrevDecl->getAccess()); 8338 8339 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8340 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8341 if (Name) // can be null along some error paths 8342 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8343 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8344 } else if (Name) { 8345 S = getNonFieldDeclScope(S); 8346 PushOnScopeChains(New, S, !IsForwardReference); 8347 if (IsForwardReference) 8348 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8349 8350 } else { 8351 CurContext->addDecl(New); 8352 } 8353 8354 // If this is the C FILE type, notify the AST context. 8355 if (IdentifierInfo *II = New->getIdentifier()) 8356 if (!New->isInvalidDecl() && 8357 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8358 II->isStr("FILE")) 8359 Context.setFILEDecl(New); 8360 8361 OwnedDecl = true; 8362 return New; 8363} 8364 8365void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8366 AdjustDeclIfTemplate(TagD); 8367 TagDecl *Tag = cast<TagDecl>(TagD); 8368 8369 // Enter the tag context. 8370 PushDeclContext(S, Tag); 8371} 8372 8373Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8374 assert(isa<ObjCContainerDecl>(IDecl) && 8375 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8376 DeclContext *OCD = cast<DeclContext>(IDecl); 8377 assert(getContainingDC(OCD) == CurContext && 8378 "The next DeclContext should be lexically contained in the current one."); 8379 CurContext = OCD; 8380 return IDecl; 8381} 8382 8383void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8384 SourceLocation FinalLoc, 8385 SourceLocation LBraceLoc) { 8386 AdjustDeclIfTemplate(TagD); 8387 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8388 8389 FieldCollector->StartClass(); 8390 8391 if (!Record->getIdentifier()) 8392 return; 8393 8394 if (FinalLoc.isValid()) 8395 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8396 8397 // C++ [class]p2: 8398 // [...] The class-name is also inserted into the scope of the 8399 // class itself; this is known as the injected-class-name. For 8400 // purposes of access checking, the injected-class-name is treated 8401 // as if it were a public member name. 8402 CXXRecordDecl *InjectedClassName 8403 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8404 Record->getLocStart(), Record->getLocation(), 8405 Record->getIdentifier(), 8406 /*PrevDecl=*/0, 8407 /*DelayTypeCreation=*/true); 8408 Context.getTypeDeclType(InjectedClassName, Record); 8409 InjectedClassName->setImplicit(); 8410 InjectedClassName->setAccess(AS_public); 8411 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8412 InjectedClassName->setDescribedClassTemplate(Template); 8413 PushOnScopeChains(InjectedClassName, S); 8414 assert(InjectedClassName->isInjectedClassName() && 8415 "Broken injected-class-name"); 8416} 8417 8418void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8419 SourceLocation RBraceLoc) { 8420 AdjustDeclIfTemplate(TagD); 8421 TagDecl *Tag = cast<TagDecl>(TagD); 8422 Tag->setRBraceLoc(RBraceLoc); 8423 8424 if (isa<CXXRecordDecl>(Tag)) 8425 FieldCollector->FinishClass(); 8426 8427 // Exit this scope of this tag's definition. 8428 PopDeclContext(); 8429 8430 // Notify the consumer that we've defined a tag. 8431 Consumer.HandleTagDeclDefinition(Tag); 8432} 8433 8434void Sema::ActOnObjCContainerFinishDefinition() { 8435 // Exit this scope of this interface definition. 8436 PopDeclContext(); 8437} 8438 8439void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8440 assert(DC == CurContext && "Mismatch of container contexts"); 8441 OriginalLexicalContext = DC; 8442 ActOnObjCContainerFinishDefinition(); 8443} 8444 8445void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8446 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8447 OriginalLexicalContext = 0; 8448} 8449 8450void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8451 AdjustDeclIfTemplate(TagD); 8452 TagDecl *Tag = cast<TagDecl>(TagD); 8453 Tag->setInvalidDecl(); 8454 8455 // We're undoing ActOnTagStartDefinition here, not 8456 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8457 // the FieldCollector. 8458 8459 PopDeclContext(); 8460} 8461 8462// Note that FieldName may be null for anonymous bitfields. 8463ExprResult Sema::VerifyBitField(SourceLocation FieldLoc, 8464 IdentifierInfo *FieldName, 8465 QualType FieldTy, Expr *BitWidth, 8466 bool *ZeroWidth) { 8467 // Default to true; that shouldn't confuse checks for emptiness 8468 if (ZeroWidth) 8469 *ZeroWidth = true; 8470 8471 // C99 6.7.2.1p4 - verify the field type. 8472 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8473 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8474 // Handle incomplete types with specific error. 8475 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8476 return ExprError(); 8477 if (FieldName) 8478 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8479 << FieldName << FieldTy << BitWidth->getSourceRange(); 8480 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8481 << FieldTy << BitWidth->getSourceRange(); 8482 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8483 UPPC_BitFieldWidth)) 8484 return ExprError(); 8485 8486 // If the bit-width is type- or value-dependent, don't try to check 8487 // it now. 8488 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8489 return Owned(BitWidth); 8490 8491 llvm::APSInt Value; 8492 ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value); 8493 if (ICE.isInvalid()) 8494 return ICE; 8495 BitWidth = ICE.take(); 8496 8497 if (Value != 0 && ZeroWidth) 8498 *ZeroWidth = false; 8499 8500 // Zero-width bitfield is ok for anonymous field. 8501 if (Value == 0 && FieldName) 8502 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8503 8504 if (Value.isSigned() && Value.isNegative()) { 8505 if (FieldName) 8506 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8507 << FieldName << Value.toString(10); 8508 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8509 << Value.toString(10); 8510 } 8511 8512 if (!FieldTy->isDependentType()) { 8513 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8514 if (Value.getZExtValue() > TypeSize) { 8515 if (!getLangOptions().CPlusPlus) { 8516 if (FieldName) 8517 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8518 << FieldName << (unsigned)Value.getZExtValue() 8519 << (unsigned)TypeSize; 8520 8521 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8522 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8523 } 8524 8525 if (FieldName) 8526 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8527 << FieldName << (unsigned)Value.getZExtValue() 8528 << (unsigned)TypeSize; 8529 else 8530 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8531 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8532 } 8533 } 8534 8535 return Owned(BitWidth); 8536} 8537 8538/// ActOnField - Each field of a C struct/union is passed into this in order 8539/// to create a FieldDecl object for it. 8540Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8541 Declarator &D, Expr *BitfieldWidth) { 8542 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8543 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8544 /*HasInit=*/false, AS_public); 8545 return Res; 8546} 8547 8548/// HandleField - Analyze a field of a C struct or a C++ data member. 8549/// 8550FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8551 SourceLocation DeclStart, 8552 Declarator &D, Expr *BitWidth, bool HasInit, 8553 AccessSpecifier AS) { 8554 IdentifierInfo *II = D.getIdentifier(); 8555 SourceLocation Loc = DeclStart; 8556 if (II) Loc = D.getIdentifierLoc(); 8557 8558 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8559 QualType T = TInfo->getType(); 8560 if (getLangOptions().CPlusPlus) { 8561 CheckExtraCXXDefaultArguments(D); 8562 8563 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8564 UPPC_DataMemberType)) { 8565 D.setInvalidType(); 8566 T = Context.IntTy; 8567 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8568 } 8569 } 8570 8571 DiagnoseFunctionSpecifiers(D); 8572 8573 if (D.getDeclSpec().isThreadSpecified()) 8574 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8575 if (D.getDeclSpec().isConstexprSpecified()) 8576 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8577 << 2; 8578 8579 // Check to see if this name was declared as a member previously 8580 NamedDecl *PrevDecl = 0; 8581 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8582 LookupName(Previous, S); 8583 switch (Previous.getResultKind()) { 8584 case LookupResult::Found: 8585 case LookupResult::FoundUnresolvedValue: 8586 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8587 break; 8588 8589 case LookupResult::FoundOverloaded: 8590 PrevDecl = Previous.getRepresentativeDecl(); 8591 break; 8592 8593 case LookupResult::NotFound: 8594 case LookupResult::NotFoundInCurrentInstantiation: 8595 case LookupResult::Ambiguous: 8596 break; 8597 } 8598 Previous.suppressDiagnostics(); 8599 8600 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8601 // Maybe we will complain about the shadowed template parameter. 8602 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8603 // Just pretend that we didn't see the previous declaration. 8604 PrevDecl = 0; 8605 } 8606 8607 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8608 PrevDecl = 0; 8609 8610 bool Mutable 8611 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8612 SourceLocation TSSL = D.getSourceRange().getBegin(); 8613 FieldDecl *NewFD 8614 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8615 TSSL, AS, PrevDecl, &D); 8616 8617 if (NewFD->isInvalidDecl()) 8618 Record->setInvalidDecl(); 8619 8620 if (D.getDeclSpec().isModulePrivateSpecified()) 8621 NewFD->setModulePrivate(); 8622 8623 if (NewFD->isInvalidDecl() && PrevDecl) { 8624 // Don't introduce NewFD into scope; there's already something 8625 // with the same name in the same scope. 8626 } else if (II) { 8627 PushOnScopeChains(NewFD, S); 8628 } else 8629 Record->addDecl(NewFD); 8630 8631 return NewFD; 8632} 8633 8634/// \brief Build a new FieldDecl and check its well-formedness. 8635/// 8636/// This routine builds a new FieldDecl given the fields name, type, 8637/// record, etc. \p PrevDecl should refer to any previous declaration 8638/// with the same name and in the same scope as the field to be 8639/// created. 8640/// 8641/// \returns a new FieldDecl. 8642/// 8643/// \todo The Declarator argument is a hack. It will be removed once 8644FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8645 TypeSourceInfo *TInfo, 8646 RecordDecl *Record, SourceLocation Loc, 8647 bool Mutable, Expr *BitWidth, bool HasInit, 8648 SourceLocation TSSL, 8649 AccessSpecifier AS, NamedDecl *PrevDecl, 8650 Declarator *D) { 8651 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8652 bool InvalidDecl = false; 8653 if (D) InvalidDecl = D->isInvalidType(); 8654 8655 // If we receive a broken type, recover by assuming 'int' and 8656 // marking this declaration as invalid. 8657 if (T.isNull()) { 8658 InvalidDecl = true; 8659 T = Context.IntTy; 8660 } 8661 8662 QualType EltTy = Context.getBaseElementType(T); 8663 if (!EltTy->isDependentType() && 8664 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8665 // Fields of incomplete type force their record to be invalid. 8666 Record->setInvalidDecl(); 8667 InvalidDecl = true; 8668 } 8669 8670 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8671 // than a variably modified type. 8672 if (!InvalidDecl && T->isVariablyModifiedType()) { 8673 bool SizeIsNegative; 8674 llvm::APSInt Oversized; 8675 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8676 SizeIsNegative, 8677 Oversized); 8678 if (!FixedTy.isNull()) { 8679 Diag(Loc, diag::warn_illegal_constant_array_size); 8680 T = FixedTy; 8681 } else { 8682 if (SizeIsNegative) 8683 Diag(Loc, diag::err_typecheck_negative_array_size); 8684 else if (Oversized.getBoolValue()) 8685 Diag(Loc, diag::err_array_too_large) 8686 << Oversized.toString(10); 8687 else 8688 Diag(Loc, diag::err_typecheck_field_variable_size); 8689 InvalidDecl = true; 8690 } 8691 } 8692 8693 // Fields can not have abstract class types 8694 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8695 diag::err_abstract_type_in_decl, 8696 AbstractFieldType)) 8697 InvalidDecl = true; 8698 8699 bool ZeroWidth = false; 8700 // If this is declared as a bit-field, check the bit-field. 8701 if (!InvalidDecl && BitWidth) { 8702 BitWidth = VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth).take(); 8703 if (!BitWidth) { 8704 InvalidDecl = true; 8705 BitWidth = 0; 8706 ZeroWidth = false; 8707 } 8708 } 8709 8710 // Check that 'mutable' is consistent with the type of the declaration. 8711 if (!InvalidDecl && Mutable) { 8712 unsigned DiagID = 0; 8713 if (T->isReferenceType()) 8714 DiagID = diag::err_mutable_reference; 8715 else if (T.isConstQualified()) 8716 DiagID = diag::err_mutable_const; 8717 8718 if (DiagID) { 8719 SourceLocation ErrLoc = Loc; 8720 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8721 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8722 Diag(ErrLoc, DiagID); 8723 Mutable = false; 8724 InvalidDecl = true; 8725 } 8726 } 8727 8728 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8729 BitWidth, Mutable, HasInit); 8730 if (InvalidDecl) 8731 NewFD->setInvalidDecl(); 8732 8733 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8734 Diag(Loc, diag::err_duplicate_member) << II; 8735 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8736 NewFD->setInvalidDecl(); 8737 } 8738 8739 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8740 if (Record->isUnion()) { 8741 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8742 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8743 if (RDecl->getDefinition()) { 8744 // C++ [class.union]p1: An object of a class with a non-trivial 8745 // constructor, a non-trivial copy constructor, a non-trivial 8746 // destructor, or a non-trivial copy assignment operator 8747 // cannot be a member of a union, nor can an array of such 8748 // objects. 8749 if (CheckNontrivialField(NewFD)) 8750 NewFD->setInvalidDecl(); 8751 } 8752 } 8753 8754 // C++ [class.union]p1: If a union contains a member of reference type, 8755 // the program is ill-formed. 8756 if (EltTy->isReferenceType()) { 8757 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8758 << NewFD->getDeclName() << EltTy; 8759 NewFD->setInvalidDecl(); 8760 } 8761 } 8762 } 8763 8764 // FIXME: We need to pass in the attributes given an AST 8765 // representation, not a parser representation. 8766 if (D) 8767 // FIXME: What to pass instead of TUScope? 8768 ProcessDeclAttributes(TUScope, NewFD, *D); 8769 8770 // In auto-retain/release, infer strong retension for fields of 8771 // retainable type. 8772 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8773 NewFD->setInvalidDecl(); 8774 8775 if (T.isObjCGCWeak()) 8776 Diag(Loc, diag::warn_attribute_weak_on_field); 8777 8778 NewFD->setAccess(AS); 8779 return NewFD; 8780} 8781 8782bool Sema::CheckNontrivialField(FieldDecl *FD) { 8783 assert(FD); 8784 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8785 8786 if (FD->isInvalidDecl()) 8787 return true; 8788 8789 QualType EltTy = Context.getBaseElementType(FD->getType()); 8790 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8791 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8792 if (RDecl->getDefinition()) { 8793 // We check for copy constructors before constructors 8794 // because otherwise we'll never get complaints about 8795 // copy constructors. 8796 8797 CXXSpecialMember member = CXXInvalid; 8798 if (!RDecl->hasTrivialCopyConstructor()) 8799 member = CXXCopyConstructor; 8800 else if (!RDecl->hasTrivialDefaultConstructor()) 8801 member = CXXDefaultConstructor; 8802 else if (!RDecl->hasTrivialCopyAssignment()) 8803 member = CXXCopyAssignment; 8804 else if (!RDecl->hasTrivialDestructor()) 8805 member = CXXDestructor; 8806 8807 if (member != CXXInvalid) { 8808 if (!getLangOptions().CPlusPlus0x && 8809 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8810 // Objective-C++ ARC: it is an error to have a non-trivial field of 8811 // a union. However, system headers in Objective-C programs 8812 // occasionally have Objective-C lifetime objects within unions, 8813 // and rather than cause the program to fail, we make those 8814 // members unavailable. 8815 SourceLocation Loc = FD->getLocation(); 8816 if (getSourceManager().isInSystemHeader(Loc)) { 8817 if (!FD->hasAttr<UnavailableAttr>()) 8818 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8819 "this system field has retaining ownership")); 8820 return false; 8821 } 8822 } 8823 8824 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8825 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8826 diag::err_illegal_union_or_anon_struct_member) 8827 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8828 DiagnoseNontrivial(RT, member); 8829 return !getLangOptions().CPlusPlus0x; 8830 } 8831 } 8832 } 8833 8834 return false; 8835} 8836 8837/// DiagnoseNontrivial - Given that a class has a non-trivial 8838/// special member, figure out why. 8839void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8840 QualType QT(T, 0U); 8841 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8842 8843 // Check whether the member was user-declared. 8844 switch (member) { 8845 case CXXInvalid: 8846 break; 8847 8848 case CXXDefaultConstructor: 8849 if (RD->hasUserDeclaredConstructor()) { 8850 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8851 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8852 const FunctionDecl *body = 0; 8853 ci->hasBody(body); 8854 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8855 SourceLocation CtorLoc = ci->getLocation(); 8856 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8857 return; 8858 } 8859 } 8860 8861 llvm_unreachable("found no user-declared constructors"); 8862 } 8863 break; 8864 8865 case CXXCopyConstructor: 8866 if (RD->hasUserDeclaredCopyConstructor()) { 8867 SourceLocation CtorLoc = 8868 RD->getCopyConstructor(0)->getLocation(); 8869 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8870 return; 8871 } 8872 break; 8873 8874 case CXXMoveConstructor: 8875 if (RD->hasUserDeclaredMoveConstructor()) { 8876 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8877 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8878 return; 8879 } 8880 break; 8881 8882 case CXXCopyAssignment: 8883 if (RD->hasUserDeclaredCopyAssignment()) { 8884 // FIXME: this should use the location of the copy 8885 // assignment, not the type. 8886 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8887 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8888 return; 8889 } 8890 break; 8891 8892 case CXXMoveAssignment: 8893 if (RD->hasUserDeclaredMoveAssignment()) { 8894 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8895 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8896 return; 8897 } 8898 break; 8899 8900 case CXXDestructor: 8901 if (RD->hasUserDeclaredDestructor()) { 8902 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8903 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8904 return; 8905 } 8906 break; 8907 } 8908 8909 typedef CXXRecordDecl::base_class_iterator base_iter; 8910 8911 // Virtual bases and members inhibit trivial copying/construction, 8912 // but not trivial destruction. 8913 if (member != CXXDestructor) { 8914 // Check for virtual bases. vbases includes indirect virtual bases, 8915 // so we just iterate through the direct bases. 8916 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8917 if (bi->isVirtual()) { 8918 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8919 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8920 return; 8921 } 8922 8923 // Check for virtual methods. 8924 typedef CXXRecordDecl::method_iterator meth_iter; 8925 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8926 ++mi) { 8927 if (mi->isVirtual()) { 8928 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8929 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8930 return; 8931 } 8932 } 8933 } 8934 8935 bool (CXXRecordDecl::*hasTrivial)() const; 8936 switch (member) { 8937 case CXXDefaultConstructor: 8938 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8939 case CXXCopyConstructor: 8940 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8941 case CXXCopyAssignment: 8942 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8943 case CXXDestructor: 8944 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8945 default: 8946 llvm_unreachable("unexpected special member"); 8947 } 8948 8949 // Check for nontrivial bases (and recurse). 8950 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8951 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8952 assert(BaseRT && "Don't know how to handle dependent bases"); 8953 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8954 if (!(BaseRecTy->*hasTrivial)()) { 8955 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8956 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8957 DiagnoseNontrivial(BaseRT, member); 8958 return; 8959 } 8960 } 8961 8962 // Check for nontrivial members (and recurse). 8963 typedef RecordDecl::field_iterator field_iter; 8964 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8965 ++fi) { 8966 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8967 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8968 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8969 8970 if (!(EltRD->*hasTrivial)()) { 8971 SourceLocation FLoc = (*fi)->getLocation(); 8972 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8973 DiagnoseNontrivial(EltRT, member); 8974 return; 8975 } 8976 } 8977 8978 if (EltTy->isObjCLifetimeType()) { 8979 switch (EltTy.getObjCLifetime()) { 8980 case Qualifiers::OCL_None: 8981 case Qualifiers::OCL_ExplicitNone: 8982 break; 8983 8984 case Qualifiers::OCL_Autoreleasing: 8985 case Qualifiers::OCL_Weak: 8986 case Qualifiers::OCL_Strong: 8987 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8988 << QT << EltTy.getObjCLifetime(); 8989 return; 8990 } 8991 } 8992 } 8993 8994 llvm_unreachable("found no explanation for non-trivial member"); 8995} 8996 8997/// TranslateIvarVisibility - Translate visibility from a token ID to an 8998/// AST enum value. 8999static ObjCIvarDecl::AccessControl 9000TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 9001 switch (ivarVisibility) { 9002 default: llvm_unreachable("Unknown visitibility kind"); 9003 case tok::objc_private: return ObjCIvarDecl::Private; 9004 case tok::objc_public: return ObjCIvarDecl::Public; 9005 case tok::objc_protected: return ObjCIvarDecl::Protected; 9006 case tok::objc_package: return ObjCIvarDecl::Package; 9007 } 9008} 9009 9010/// ActOnIvar - Each ivar field of an objective-c class is passed into this 9011/// in order to create an IvarDecl object for it. 9012Decl *Sema::ActOnIvar(Scope *S, 9013 SourceLocation DeclStart, 9014 Declarator &D, Expr *BitfieldWidth, 9015 tok::ObjCKeywordKind Visibility) { 9016 9017 IdentifierInfo *II = D.getIdentifier(); 9018 Expr *BitWidth = (Expr*)BitfieldWidth; 9019 SourceLocation Loc = DeclStart; 9020 if (II) Loc = D.getIdentifierLoc(); 9021 9022 // FIXME: Unnamed fields can be handled in various different ways, for 9023 // example, unnamed unions inject all members into the struct namespace! 9024 9025 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9026 QualType T = TInfo->getType(); 9027 9028 if (BitWidth) { 9029 // 6.7.2.1p3, 6.7.2.1p4 9030 BitWidth = VerifyBitField(Loc, II, T, BitWidth).take(); 9031 if (!BitWidth) 9032 D.setInvalidType(); 9033 } else { 9034 // Not a bitfield. 9035 9036 // validate II. 9037 9038 } 9039 if (T->isReferenceType()) { 9040 Diag(Loc, diag::err_ivar_reference_type); 9041 D.setInvalidType(); 9042 } 9043 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9044 // than a variably modified type. 9045 else if (T->isVariablyModifiedType()) { 9046 Diag(Loc, diag::err_typecheck_ivar_variable_size); 9047 D.setInvalidType(); 9048 } 9049 9050 // Get the visibility (access control) for this ivar. 9051 ObjCIvarDecl::AccessControl ac = 9052 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 9053 : ObjCIvarDecl::None; 9054 // Must set ivar's DeclContext to its enclosing interface. 9055 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 9056 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl()) 9057 return 0; 9058 ObjCContainerDecl *EnclosingContext; 9059 if (ObjCImplementationDecl *IMPDecl = 9060 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9061 if (!LangOpts.ObjCNonFragileABI2) { 9062 // Case of ivar declared in an implementation. Context is that of its class. 9063 EnclosingContext = IMPDecl->getClassInterface(); 9064 assert(EnclosingContext && "Implementation has no class interface!"); 9065 } 9066 else 9067 EnclosingContext = EnclosingDecl; 9068 } else { 9069 if (ObjCCategoryDecl *CDecl = 9070 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9071 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 9072 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 9073 return 0; 9074 } 9075 } 9076 EnclosingContext = EnclosingDecl; 9077 } 9078 9079 // Construct the decl. 9080 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 9081 DeclStart, Loc, II, T, 9082 TInfo, ac, (Expr *)BitfieldWidth); 9083 9084 if (II) { 9085 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 9086 ForRedeclaration); 9087 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9088 && !isa<TagDecl>(PrevDecl)) { 9089 Diag(Loc, diag::err_duplicate_member) << II; 9090 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9091 NewID->setInvalidDecl(); 9092 } 9093 } 9094 9095 // Process attributes attached to the ivar. 9096 ProcessDeclAttributes(S, NewID, D); 9097 9098 if (D.isInvalidType()) 9099 NewID->setInvalidDecl(); 9100 9101 // In ARC, infer 'retaining' for ivars of retainable type. 9102 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9103 NewID->setInvalidDecl(); 9104 9105 if (D.getDeclSpec().isModulePrivateSpecified()) 9106 NewID->setModulePrivate(); 9107 9108 if (II) { 9109 // FIXME: When interfaces are DeclContexts, we'll need to add 9110 // these to the interface. 9111 S->AddDecl(NewID); 9112 IdResolver.AddDecl(NewID); 9113 } 9114 9115 return NewID; 9116} 9117 9118/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9119/// class and class extensions. For every class @interface and class 9120/// extension @interface, if the last ivar is a bitfield of any type, 9121/// then add an implicit `char :0` ivar to the end of that interface. 9122void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9123 SmallVectorImpl<Decl *> &AllIvarDecls) { 9124 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9125 return; 9126 9127 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9128 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9129 9130 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9131 return; 9132 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9133 if (!ID) { 9134 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9135 if (!CD->IsClassExtension()) 9136 return; 9137 } 9138 // No need to add this to end of @implementation. 9139 else 9140 return; 9141 } 9142 // All conditions are met. Add a new bitfield to the tail end of ivars. 9143 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9144 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9145 9146 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9147 DeclLoc, DeclLoc, 0, 9148 Context.CharTy, 9149 Context.getTrivialTypeSourceInfo(Context.CharTy, 9150 DeclLoc), 9151 ObjCIvarDecl::Private, BW, 9152 true); 9153 AllIvarDecls.push_back(Ivar); 9154} 9155 9156void Sema::ActOnFields(Scope* S, 9157 SourceLocation RecLoc, Decl *EnclosingDecl, 9158 llvm::ArrayRef<Decl *> Fields, 9159 SourceLocation LBrac, SourceLocation RBrac, 9160 AttributeList *Attr) { 9161 assert(EnclosingDecl && "missing record or interface decl"); 9162 9163 // If the decl this is being inserted into is invalid, then it may be a 9164 // redeclaration or some other bogus case. Don't try to add fields to it. 9165 if (EnclosingDecl->isInvalidDecl()) 9166 return; 9167 9168 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9169 9170 // Start counting up the number of named members; make sure to include 9171 // members of anonymous structs and unions in the total. 9172 unsigned NumNamedMembers = 0; 9173 if (Record) { 9174 for (RecordDecl::decl_iterator i = Record->decls_begin(), 9175 e = Record->decls_end(); i != e; i++) { 9176 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*i)) 9177 if (IFD->getDeclName()) 9178 ++NumNamedMembers; 9179 } 9180 } 9181 9182 // Verify that all the fields are okay. 9183 SmallVector<FieldDecl*, 32> RecFields; 9184 9185 bool ARCErrReported = false; 9186 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9187 i != end; ++i) { 9188 FieldDecl *FD = cast<FieldDecl>(*i); 9189 9190 // Get the type for the field. 9191 const Type *FDTy = FD->getType().getTypePtr(); 9192 9193 if (!FD->isAnonymousStructOrUnion()) { 9194 // Remember all fields written by the user. 9195 RecFields.push_back(FD); 9196 } 9197 9198 // If the field is already invalid for some reason, don't emit more 9199 // diagnostics about it. 9200 if (FD->isInvalidDecl()) { 9201 EnclosingDecl->setInvalidDecl(); 9202 continue; 9203 } 9204 9205 // C99 6.7.2.1p2: 9206 // A structure or union shall not contain a member with 9207 // incomplete or function type (hence, a structure shall not 9208 // contain an instance of itself, but may contain a pointer to 9209 // an instance of itself), except that the last member of a 9210 // structure with more than one named member may have incomplete 9211 // array type; such a structure (and any union containing, 9212 // possibly recursively, a member that is such a structure) 9213 // shall not be a member of a structure or an element of an 9214 // array. 9215 if (FDTy->isFunctionType()) { 9216 // Field declared as a function. 9217 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9218 << FD->getDeclName(); 9219 FD->setInvalidDecl(); 9220 EnclosingDecl->setInvalidDecl(); 9221 continue; 9222 } else if (FDTy->isIncompleteArrayType() && Record && 9223 ((i + 1 == Fields.end() && !Record->isUnion()) || 9224 ((getLangOptions().MicrosoftExt || 9225 getLangOptions().CPlusPlus) && 9226 (i + 1 == Fields.end() || Record->isUnion())))) { 9227 // Flexible array member. 9228 // Microsoft and g++ is more permissive regarding flexible array. 9229 // It will accept flexible array in union and also 9230 // as the sole element of a struct/class. 9231 if (getLangOptions().MicrosoftExt) { 9232 if (Record->isUnion()) 9233 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9234 << FD->getDeclName(); 9235 else if (Fields.size() == 1) 9236 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9237 << FD->getDeclName() << Record->getTagKind(); 9238 } else if (getLangOptions().CPlusPlus) { 9239 if (Record->isUnion()) 9240 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9241 << FD->getDeclName(); 9242 else if (Fields.size() == 1) 9243 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9244 << FD->getDeclName() << Record->getTagKind(); 9245 } else if (NumNamedMembers < 1) { 9246 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9247 << FD->getDeclName(); 9248 FD->setInvalidDecl(); 9249 EnclosingDecl->setInvalidDecl(); 9250 continue; 9251 } 9252 if (!FD->getType()->isDependentType() && 9253 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9254 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9255 << FD->getDeclName() << FD->getType(); 9256 FD->setInvalidDecl(); 9257 EnclosingDecl->setInvalidDecl(); 9258 continue; 9259 } 9260 // Okay, we have a legal flexible array member at the end of the struct. 9261 if (Record) 9262 Record->setHasFlexibleArrayMember(true); 9263 } else if (!FDTy->isDependentType() && 9264 RequireCompleteType(FD->getLocation(), FD->getType(), 9265 diag::err_field_incomplete)) { 9266 // Incomplete type 9267 FD->setInvalidDecl(); 9268 EnclosingDecl->setInvalidDecl(); 9269 continue; 9270 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9271 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9272 // If this is a member of a union, then entire union becomes "flexible". 9273 if (Record && Record->isUnion()) { 9274 Record->setHasFlexibleArrayMember(true); 9275 } else { 9276 // If this is a struct/class and this is not the last element, reject 9277 // it. Note that GCC supports variable sized arrays in the middle of 9278 // structures. 9279 if (i + 1 != Fields.end()) 9280 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9281 << FD->getDeclName() << FD->getType(); 9282 else { 9283 // We support flexible arrays at the end of structs in 9284 // other structs as an extension. 9285 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9286 << FD->getDeclName(); 9287 if (Record) 9288 Record->setHasFlexibleArrayMember(true); 9289 } 9290 } 9291 } 9292 if (Record && FDTTy->getDecl()->hasObjectMember()) 9293 Record->setHasObjectMember(true); 9294 } else if (FDTy->isObjCObjectType()) { 9295 /// A field cannot be an Objective-c object 9296 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9297 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9298 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9299 FD->setType(T); 9300 } 9301 else if (!getLangOptions().CPlusPlus) { 9302 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9303 // It's an error in ARC if a field has lifetime. 9304 // We don't want to report this in a system header, though, 9305 // so we just make the field unavailable. 9306 // FIXME: that's really not sufficient; we need to make the type 9307 // itself invalid to, say, initialize or copy. 9308 QualType T = FD->getType(); 9309 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9310 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9311 SourceLocation loc = FD->getLocation(); 9312 if (getSourceManager().isInSystemHeader(loc)) { 9313 if (!FD->hasAttr<UnavailableAttr>()) { 9314 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9315 "this system field has retaining ownership")); 9316 } 9317 } else { 9318 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9319 << T->isBlockPointerType(); 9320 } 9321 ARCErrReported = true; 9322 } 9323 } 9324 else if (getLangOptions().ObjC1 && 9325 getLangOptions().getGC() != LangOptions::NonGC && 9326 Record && !Record->hasObjectMember()) { 9327 if (FD->getType()->isObjCObjectPointerType() || 9328 FD->getType().isObjCGCStrong()) 9329 Record->setHasObjectMember(true); 9330 else if (Context.getAsArrayType(FD->getType())) { 9331 QualType BaseType = Context.getBaseElementType(FD->getType()); 9332 if (BaseType->isRecordType() && 9333 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9334 Record->setHasObjectMember(true); 9335 else if (BaseType->isObjCObjectPointerType() || 9336 BaseType.isObjCGCStrong()) 9337 Record->setHasObjectMember(true); 9338 } 9339 } 9340 } 9341 // Keep track of the number of named members. 9342 if (FD->getIdentifier()) 9343 ++NumNamedMembers; 9344 } 9345 9346 // Okay, we successfully defined 'Record'. 9347 if (Record) { 9348 bool Completed = false; 9349 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9350 if (!CXXRecord->isInvalidDecl()) { 9351 // Set access bits correctly on the directly-declared conversions. 9352 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9353 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9354 I != E; ++I) 9355 Convs->setAccess(I, (*I)->getAccess()); 9356 9357 if (!CXXRecord->isDependentType()) { 9358 // Objective-C Automatic Reference Counting: 9359 // If a class has a non-static data member of Objective-C pointer 9360 // type (or array thereof), it is a non-POD type and its 9361 // default constructor (if any), copy constructor, copy assignment 9362 // operator, and destructor are non-trivial. 9363 // 9364 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9365 // However, here we check whether this particular class is only 9366 // non-POD because of the presence of an Objective-C pointer member. 9367 // If so, objects of this type cannot be shared between code compiled 9368 // with instant objects and code compiled with manual retain/release. 9369 if (getLangOptions().ObjCAutoRefCount && 9370 CXXRecord->hasObjectMember() && 9371 CXXRecord->getLinkage() == ExternalLinkage) { 9372 if (CXXRecord->isPOD()) { 9373 Diag(CXXRecord->getLocation(), 9374 diag::warn_arc_non_pod_class_with_object_member) 9375 << CXXRecord; 9376 } else { 9377 // FIXME: Fix-Its would be nice here, but finding a good location 9378 // for them is going to be tricky. 9379 if (CXXRecord->hasTrivialCopyConstructor()) 9380 Diag(CXXRecord->getLocation(), 9381 diag::warn_arc_trivial_member_function_with_object_member) 9382 << CXXRecord << 0; 9383 if (CXXRecord->hasTrivialCopyAssignment()) 9384 Diag(CXXRecord->getLocation(), 9385 diag::warn_arc_trivial_member_function_with_object_member) 9386 << CXXRecord << 1; 9387 if (CXXRecord->hasTrivialDestructor()) 9388 Diag(CXXRecord->getLocation(), 9389 diag::warn_arc_trivial_member_function_with_object_member) 9390 << CXXRecord << 2; 9391 } 9392 } 9393 9394 // Adjust user-defined destructor exception spec. 9395 if (getLangOptions().CPlusPlus0x && 9396 CXXRecord->hasUserDeclaredDestructor()) 9397 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9398 9399 // Add any implicitly-declared members to this class. 9400 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9401 9402 // If we have virtual base classes, we may end up finding multiple 9403 // final overriders for a given virtual function. Check for this 9404 // problem now. 9405 if (CXXRecord->getNumVBases()) { 9406 CXXFinalOverriderMap FinalOverriders; 9407 CXXRecord->getFinalOverriders(FinalOverriders); 9408 9409 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9410 MEnd = FinalOverriders.end(); 9411 M != MEnd; ++M) { 9412 for (OverridingMethods::iterator SO = M->second.begin(), 9413 SOEnd = M->second.end(); 9414 SO != SOEnd; ++SO) { 9415 assert(SO->second.size() > 0 && 9416 "Virtual function without overridding functions?"); 9417 if (SO->second.size() == 1) 9418 continue; 9419 9420 // C++ [class.virtual]p2: 9421 // In a derived class, if a virtual member function of a base 9422 // class subobject has more than one final overrider the 9423 // program is ill-formed. 9424 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9425 << (NamedDecl *)M->first << Record; 9426 Diag(M->first->getLocation(), 9427 diag::note_overridden_virtual_function); 9428 for (OverridingMethods::overriding_iterator 9429 OM = SO->second.begin(), 9430 OMEnd = SO->second.end(); 9431 OM != OMEnd; ++OM) 9432 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9433 << (NamedDecl *)M->first << OM->Method->getParent(); 9434 9435 Record->setInvalidDecl(); 9436 } 9437 } 9438 CXXRecord->completeDefinition(&FinalOverriders); 9439 Completed = true; 9440 } 9441 } 9442 } 9443 } 9444 9445 if (!Completed) 9446 Record->completeDefinition(); 9447 9448 // Now that the record is complete, do any delayed exception spec checks 9449 // we were missing. 9450 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9451 const CXXDestructorDecl *Dtor = 9452 DelayedDestructorExceptionSpecChecks.back().first; 9453 if (Dtor->getParent() != Record) 9454 break; 9455 9456 assert(!Dtor->getParent()->isDependentType() && 9457 "Should not ever add destructors of templates into the list."); 9458 CheckOverridingFunctionExceptionSpec(Dtor, 9459 DelayedDestructorExceptionSpecChecks.back().second); 9460 DelayedDestructorExceptionSpecChecks.pop_back(); 9461 } 9462 9463 } else { 9464 ObjCIvarDecl **ClsFields = 9465 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9466 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9467 ID->setEndOfDefinitionLoc(RBrac); 9468 // Add ivar's to class's DeclContext. 9469 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9470 ClsFields[i]->setLexicalDeclContext(ID); 9471 ID->addDecl(ClsFields[i]); 9472 } 9473 // Must enforce the rule that ivars in the base classes may not be 9474 // duplicates. 9475 if (ID->getSuperClass()) 9476 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9477 } else if (ObjCImplementationDecl *IMPDecl = 9478 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9479 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9480 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9481 // Ivar declared in @implementation never belongs to the implementation. 9482 // Only it is in implementation's lexical context. 9483 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9484 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9485 } else if (ObjCCategoryDecl *CDecl = 9486 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9487 // case of ivars in class extension; all other cases have been 9488 // reported as errors elsewhere. 9489 // FIXME. Class extension does not have a LocEnd field. 9490 // CDecl->setLocEnd(RBrac); 9491 // Add ivar's to class extension's DeclContext. 9492 // Diagnose redeclaration of private ivars. 9493 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9494 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9495 if (IDecl) { 9496 if (const ObjCIvarDecl *ClsIvar = 9497 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9498 Diag(ClsFields[i]->getLocation(), 9499 diag::err_duplicate_ivar_declaration); 9500 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9501 continue; 9502 } 9503 for (const ObjCCategoryDecl *ClsExtDecl = 9504 IDecl->getFirstClassExtension(); 9505 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9506 if (const ObjCIvarDecl *ClsExtIvar = 9507 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9508 Diag(ClsFields[i]->getLocation(), 9509 diag::err_duplicate_ivar_declaration); 9510 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9511 continue; 9512 } 9513 } 9514 } 9515 ClsFields[i]->setLexicalDeclContext(CDecl); 9516 CDecl->addDecl(ClsFields[i]); 9517 } 9518 } 9519 } 9520 9521 if (Attr) 9522 ProcessDeclAttributeList(S, Record, Attr); 9523 9524 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9525 // set the visibility of this record. 9526 if (Record && !Record->getDeclContext()->isRecord()) 9527 AddPushedVisibilityAttribute(Record); 9528} 9529 9530/// \brief Determine whether the given integral value is representable within 9531/// the given type T. 9532static bool isRepresentableIntegerValue(ASTContext &Context, 9533 llvm::APSInt &Value, 9534 QualType T) { 9535 assert(T->isIntegralType(Context) && "Integral type required!"); 9536 unsigned BitWidth = Context.getIntWidth(T); 9537 9538 if (Value.isUnsigned() || Value.isNonNegative()) { 9539 if (T->isSignedIntegerOrEnumerationType()) 9540 --BitWidth; 9541 return Value.getActiveBits() <= BitWidth; 9542 } 9543 return Value.getMinSignedBits() <= BitWidth; 9544} 9545 9546// \brief Given an integral type, return the next larger integral type 9547// (or a NULL type of no such type exists). 9548static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9549 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9550 // enum checking below. 9551 assert(T->isIntegralType(Context) && "Integral type required!"); 9552 const unsigned NumTypes = 4; 9553 QualType SignedIntegralTypes[NumTypes] = { 9554 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9555 }; 9556 QualType UnsignedIntegralTypes[NumTypes] = { 9557 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9558 Context.UnsignedLongLongTy 9559 }; 9560 9561 unsigned BitWidth = Context.getTypeSize(T); 9562 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9563 : UnsignedIntegralTypes; 9564 for (unsigned I = 0; I != NumTypes; ++I) 9565 if (Context.getTypeSize(Types[I]) > BitWidth) 9566 return Types[I]; 9567 9568 return QualType(); 9569} 9570 9571EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9572 EnumConstantDecl *LastEnumConst, 9573 SourceLocation IdLoc, 9574 IdentifierInfo *Id, 9575 Expr *Val) { 9576 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9577 llvm::APSInt EnumVal(IntWidth); 9578 QualType EltTy; 9579 9580 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9581 Val = 0; 9582 9583 if (Val) 9584 Val = DefaultLvalueConversion(Val).take(); 9585 9586 if (Val) { 9587 if (Enum->isDependentType() || Val->isTypeDependent()) 9588 EltTy = Context.DependentTy; 9589 else { 9590 SourceLocation ExpLoc; 9591 if (getLangOptions().CPlusPlus0x && Enum->isFixed() && 9592 !getLangOptions().MicrosoftMode) { 9593 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the 9594 // constant-expression in the enumerator-definition shall be a converted 9595 // constant expression of the underlying type. 9596 EltTy = Enum->getIntegerType(); 9597 ExprResult Converted = 9598 CheckConvertedConstantExpression(Val, EltTy, EnumVal, 9599 CCEK_Enumerator); 9600 if (Converted.isInvalid()) 9601 Val = 0; 9602 else 9603 Val = Converted.take(); 9604 } else if (!Val->isValueDependent() && 9605 !(Val = VerifyIntegerConstantExpression(Val, 9606 &EnumVal).take())) { 9607 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9608 } else { 9609 if (Enum->isFixed()) { 9610 EltTy = Enum->getIntegerType(); 9611 9612 // In Obj-C and Microsoft mode, require the enumeration value to be 9613 // representable in the underlying type of the enumeration. In C++11, 9614 // we perform a non-narrowing conversion as part of converted constant 9615 // expression checking. 9616 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9617 if (getLangOptions().MicrosoftExt) { 9618 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9619 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9620 } else 9621 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy; 9622 } else 9623 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9624 } else if (getLangOptions().CPlusPlus) { 9625 // C++11 [dcl.enum]p5: 9626 // If the underlying type is not fixed, the type of each enumerator 9627 // is the type of its initializing value: 9628 // - If an initializer is specified for an enumerator, the 9629 // initializing value has the same type as the expression. 9630 EltTy = Val->getType(); 9631 } else { 9632 // C99 6.7.2.2p2: 9633 // The expression that defines the value of an enumeration constant 9634 // shall be an integer constant expression that has a value 9635 // representable as an int. 9636 9637 // Complain if the value is not representable in an int. 9638 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9639 Diag(IdLoc, diag::ext_enum_value_not_int) 9640 << EnumVal.toString(10) << Val->getSourceRange() 9641 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9642 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9643 // Force the type of the expression to 'int'. 9644 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9645 } 9646 EltTy = Val->getType(); 9647 } 9648 } 9649 } 9650 } 9651 9652 if (!Val) { 9653 if (Enum->isDependentType()) 9654 EltTy = Context.DependentTy; 9655 else if (!LastEnumConst) { 9656 // C++0x [dcl.enum]p5: 9657 // If the underlying type is not fixed, the type of each enumerator 9658 // is the type of its initializing value: 9659 // - If no initializer is specified for the first enumerator, the 9660 // initializing value has an unspecified integral type. 9661 // 9662 // GCC uses 'int' for its unspecified integral type, as does 9663 // C99 6.7.2.2p3. 9664 if (Enum->isFixed()) { 9665 EltTy = Enum->getIntegerType(); 9666 } 9667 else { 9668 EltTy = Context.IntTy; 9669 } 9670 } else { 9671 // Assign the last value + 1. 9672 EnumVal = LastEnumConst->getInitVal(); 9673 ++EnumVal; 9674 EltTy = LastEnumConst->getType(); 9675 9676 // Check for overflow on increment. 9677 if (EnumVal < LastEnumConst->getInitVal()) { 9678 // C++0x [dcl.enum]p5: 9679 // If the underlying type is not fixed, the type of each enumerator 9680 // is the type of its initializing value: 9681 // 9682 // - Otherwise the type of the initializing value is the same as 9683 // the type of the initializing value of the preceding enumerator 9684 // unless the incremented value is not representable in that type, 9685 // in which case the type is an unspecified integral type 9686 // sufficient to contain the incremented value. If no such type 9687 // exists, the program is ill-formed. 9688 QualType T = getNextLargerIntegralType(Context, EltTy); 9689 if (T.isNull() || Enum->isFixed()) { 9690 // There is no integral type larger enough to represent this 9691 // value. Complain, then allow the value to wrap around. 9692 EnumVal = LastEnumConst->getInitVal(); 9693 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9694 ++EnumVal; 9695 if (Enum->isFixed()) 9696 // When the underlying type is fixed, this is ill-formed. 9697 Diag(IdLoc, diag::err_enumerator_wrapped) 9698 << EnumVal.toString(10) 9699 << EltTy; 9700 else 9701 Diag(IdLoc, diag::warn_enumerator_too_large) 9702 << EnumVal.toString(10); 9703 } else { 9704 EltTy = T; 9705 } 9706 9707 // Retrieve the last enumerator's value, extent that type to the 9708 // type that is supposed to be large enough to represent the incremented 9709 // value, then increment. 9710 EnumVal = LastEnumConst->getInitVal(); 9711 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9712 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9713 ++EnumVal; 9714 9715 // If we're not in C++, diagnose the overflow of enumerator values, 9716 // which in C99 means that the enumerator value is not representable in 9717 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9718 // permits enumerator values that are representable in some larger 9719 // integral type. 9720 if (!getLangOptions().CPlusPlus && !T.isNull()) 9721 Diag(IdLoc, diag::warn_enum_value_overflow); 9722 } else if (!getLangOptions().CPlusPlus && 9723 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9724 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9725 Diag(IdLoc, diag::ext_enum_value_not_int) 9726 << EnumVal.toString(10) << 1; 9727 } 9728 } 9729 } 9730 9731 if (!EltTy->isDependentType()) { 9732 // Make the enumerator value match the signedness and size of the 9733 // enumerator's type. 9734 EnumVal = EnumVal.extOrTrunc(Context.getIntWidth(EltTy)); 9735 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9736 } 9737 9738 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9739 Val, EnumVal); 9740} 9741 9742 9743Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9744 SourceLocation IdLoc, IdentifierInfo *Id, 9745 AttributeList *Attr, 9746 SourceLocation EqualLoc, Expr *Val) { 9747 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9748 EnumConstantDecl *LastEnumConst = 9749 cast_or_null<EnumConstantDecl>(lastEnumConst); 9750 9751 // The scope passed in may not be a decl scope. Zip up the scope tree until 9752 // we find one that is. 9753 S = getNonFieldDeclScope(S); 9754 9755 // Verify that there isn't already something declared with this name in this 9756 // scope. 9757 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9758 ForRedeclaration); 9759 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9760 // Maybe we will complain about the shadowed template parameter. 9761 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9762 // Just pretend that we didn't see the previous declaration. 9763 PrevDecl = 0; 9764 } 9765 9766 if (PrevDecl) { 9767 // When in C++, we may get a TagDecl with the same name; in this case the 9768 // enum constant will 'hide' the tag. 9769 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9770 "Received TagDecl when not in C++!"); 9771 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9772 if (isa<EnumConstantDecl>(PrevDecl)) 9773 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9774 else 9775 Diag(IdLoc, diag::err_redefinition) << Id; 9776 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9777 return 0; 9778 } 9779 } 9780 9781 // C++ [class.mem]p13: 9782 // If T is the name of a class, then each of the following shall have a 9783 // name different from T: 9784 // - every enumerator of every member of class T that is an enumerated 9785 // type 9786 if (CXXRecordDecl *Record 9787 = dyn_cast<CXXRecordDecl>( 9788 TheEnumDecl->getDeclContext()->getRedeclContext())) 9789 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9790 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9791 9792 EnumConstantDecl *New = 9793 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9794 9795 if (New) { 9796 // Process attributes. 9797 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9798 9799 // Register this decl in the current scope stack. 9800 New->setAccess(TheEnumDecl->getAccess()); 9801 PushOnScopeChains(New, S); 9802 } 9803 9804 return New; 9805} 9806 9807void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9808 SourceLocation RBraceLoc, Decl *EnumDeclX, 9809 Decl **Elements, unsigned NumElements, 9810 Scope *S, AttributeList *Attr) { 9811 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9812 QualType EnumType = Context.getTypeDeclType(Enum); 9813 9814 if (Attr) 9815 ProcessDeclAttributeList(S, Enum, Attr); 9816 9817 if (Enum->isDependentType()) { 9818 for (unsigned i = 0; i != NumElements; ++i) { 9819 EnumConstantDecl *ECD = 9820 cast_or_null<EnumConstantDecl>(Elements[i]); 9821 if (!ECD) continue; 9822 9823 ECD->setType(EnumType); 9824 } 9825 9826 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9827 return; 9828 } 9829 9830 // TODO: If the result value doesn't fit in an int, it must be a long or long 9831 // long value. ISO C does not support this, but GCC does as an extension, 9832 // emit a warning. 9833 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9834 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9835 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9836 9837 // Verify that all the values are okay, compute the size of the values, and 9838 // reverse the list. 9839 unsigned NumNegativeBits = 0; 9840 unsigned NumPositiveBits = 0; 9841 9842 // Keep track of whether all elements have type int. 9843 bool AllElementsInt = true; 9844 9845 for (unsigned i = 0; i != NumElements; ++i) { 9846 EnumConstantDecl *ECD = 9847 cast_or_null<EnumConstantDecl>(Elements[i]); 9848 if (!ECD) continue; // Already issued a diagnostic. 9849 9850 const llvm::APSInt &InitVal = ECD->getInitVal(); 9851 9852 // Keep track of the size of positive and negative values. 9853 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9854 NumPositiveBits = std::max(NumPositiveBits, 9855 (unsigned)InitVal.getActiveBits()); 9856 else 9857 NumNegativeBits = std::max(NumNegativeBits, 9858 (unsigned)InitVal.getMinSignedBits()); 9859 9860 // Keep track of whether every enum element has type int (very commmon). 9861 if (AllElementsInt) 9862 AllElementsInt = ECD->getType() == Context.IntTy; 9863 } 9864 9865 // Figure out the type that should be used for this enum. 9866 QualType BestType; 9867 unsigned BestWidth; 9868 9869 // C++0x N3000 [conv.prom]p3: 9870 // An rvalue of an unscoped enumeration type whose underlying 9871 // type is not fixed can be converted to an rvalue of the first 9872 // of the following types that can represent all the values of 9873 // the enumeration: int, unsigned int, long int, unsigned long 9874 // int, long long int, or unsigned long long int. 9875 // C99 6.4.4.3p2: 9876 // An identifier declared as an enumeration constant has type int. 9877 // The C99 rule is modified by a gcc extension 9878 QualType BestPromotionType; 9879 9880 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9881 // -fshort-enums is the equivalent to specifying the packed attribute on all 9882 // enum definitions. 9883 if (LangOpts.ShortEnums) 9884 Packed = true; 9885 9886 if (Enum->isFixed()) { 9887 BestType = Enum->getIntegerType(); 9888 if (BestType->isPromotableIntegerType()) 9889 BestPromotionType = Context.getPromotedIntegerType(BestType); 9890 else 9891 BestPromotionType = BestType; 9892 // We don't need to set BestWidth, because BestType is going to be the type 9893 // of the enumerators, but we do anyway because otherwise some compilers 9894 // warn that it might be used uninitialized. 9895 BestWidth = CharWidth; 9896 } 9897 else if (NumNegativeBits) { 9898 // If there is a negative value, figure out the smallest integer type (of 9899 // int/long/longlong) that fits. 9900 // If it's packed, check also if it fits a char or a short. 9901 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9902 BestType = Context.SignedCharTy; 9903 BestWidth = CharWidth; 9904 } else if (Packed && NumNegativeBits <= ShortWidth && 9905 NumPositiveBits < ShortWidth) { 9906 BestType = Context.ShortTy; 9907 BestWidth = ShortWidth; 9908 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9909 BestType = Context.IntTy; 9910 BestWidth = IntWidth; 9911 } else { 9912 BestWidth = Context.getTargetInfo().getLongWidth(); 9913 9914 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9915 BestType = Context.LongTy; 9916 } else { 9917 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9918 9919 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9920 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9921 BestType = Context.LongLongTy; 9922 } 9923 } 9924 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9925 } else { 9926 // If there is no negative value, figure out the smallest type that fits 9927 // all of the enumerator values. 9928 // If it's packed, check also if it fits a char or a short. 9929 if (Packed && NumPositiveBits <= CharWidth) { 9930 BestType = Context.UnsignedCharTy; 9931 BestPromotionType = Context.IntTy; 9932 BestWidth = CharWidth; 9933 } else if (Packed && NumPositiveBits <= ShortWidth) { 9934 BestType = Context.UnsignedShortTy; 9935 BestPromotionType = Context.IntTy; 9936 BestWidth = ShortWidth; 9937 } else if (NumPositiveBits <= IntWidth) { 9938 BestType = Context.UnsignedIntTy; 9939 BestWidth = IntWidth; 9940 BestPromotionType 9941 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9942 ? Context.UnsignedIntTy : Context.IntTy; 9943 } else if (NumPositiveBits <= 9944 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9945 BestType = Context.UnsignedLongTy; 9946 BestPromotionType 9947 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9948 ? Context.UnsignedLongTy : Context.LongTy; 9949 } else { 9950 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9951 assert(NumPositiveBits <= BestWidth && 9952 "How could an initializer get larger than ULL?"); 9953 BestType = Context.UnsignedLongLongTy; 9954 BestPromotionType 9955 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9956 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9957 } 9958 } 9959 9960 // Loop over all of the enumerator constants, changing their types to match 9961 // the type of the enum if needed. 9962 for (unsigned i = 0; i != NumElements; ++i) { 9963 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9964 if (!ECD) continue; // Already issued a diagnostic. 9965 9966 // Standard C says the enumerators have int type, but we allow, as an 9967 // extension, the enumerators to be larger than int size. If each 9968 // enumerator value fits in an int, type it as an int, otherwise type it the 9969 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9970 // that X has type 'int', not 'unsigned'. 9971 9972 // Determine whether the value fits into an int. 9973 llvm::APSInt InitVal = ECD->getInitVal(); 9974 9975 // If it fits into an integer type, force it. Otherwise force it to match 9976 // the enum decl type. 9977 QualType NewTy; 9978 unsigned NewWidth; 9979 bool NewSign; 9980 if (!getLangOptions().CPlusPlus && 9981 !Enum->isFixed() && 9982 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9983 NewTy = Context.IntTy; 9984 NewWidth = IntWidth; 9985 NewSign = true; 9986 } else if (ECD->getType() == BestType) { 9987 // Already the right type! 9988 if (getLangOptions().CPlusPlus) 9989 // C++ [dcl.enum]p4: Following the closing brace of an 9990 // enum-specifier, each enumerator has the type of its 9991 // enumeration. 9992 ECD->setType(EnumType); 9993 continue; 9994 } else { 9995 NewTy = BestType; 9996 NewWidth = BestWidth; 9997 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9998 } 9999 10000 // Adjust the APSInt value. 10001 InitVal = InitVal.extOrTrunc(NewWidth); 10002 InitVal.setIsSigned(NewSign); 10003 ECD->setInitVal(InitVal); 10004 10005 // Adjust the Expr initializer and type. 10006 if (ECD->getInitExpr() && 10007 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 10008 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 10009 CK_IntegralCast, 10010 ECD->getInitExpr(), 10011 /*base paths*/ 0, 10012 VK_RValue)); 10013 if (getLangOptions().CPlusPlus) 10014 // C++ [dcl.enum]p4: Following the closing brace of an 10015 // enum-specifier, each enumerator has the type of its 10016 // enumeration. 10017 ECD->setType(EnumType); 10018 else 10019 ECD->setType(NewTy); 10020 } 10021 10022 Enum->completeDefinition(BestType, BestPromotionType, 10023 NumPositiveBits, NumNegativeBits); 10024} 10025 10026Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 10027 SourceLocation StartLoc, 10028 SourceLocation EndLoc) { 10029 StringLiteral *AsmString = cast<StringLiteral>(expr); 10030 10031 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 10032 AsmString, StartLoc, 10033 EndLoc); 10034 CurContext->addDecl(New); 10035 return New; 10036} 10037 10038DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 10039 SourceLocation ImportLoc, 10040 ModuleIdPath Path) { 10041 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 10042 Module::AllVisible, 10043 /*IsIncludeDirective=*/false); 10044 if (!Mod) 10045 return true; 10046 10047 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 10048 Module *ModCheck = Mod; 10049 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 10050 // If we've run out of module parents, just drop the remaining identifiers. 10051 // We need the length to be consistent. 10052 if (!ModCheck) 10053 break; 10054 ModCheck = ModCheck->Parent; 10055 10056 IdentifierLocs.push_back(Path[I].second); 10057 } 10058 10059 ImportDecl *Import = ImportDecl::Create(Context, 10060 Context.getTranslationUnitDecl(), 10061 AtLoc.isValid()? AtLoc : ImportLoc, 10062 Mod, IdentifierLocs); 10063 Context.getTranslationUnitDecl()->addDecl(Import); 10064 return Import; 10065} 10066 10067void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 10068 SourceLocation PragmaLoc, 10069 SourceLocation NameLoc) { 10070 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 10071 10072 if (PrevDecl) { 10073 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 10074 } else { 10075 (void)WeakUndeclaredIdentifiers.insert( 10076 std::pair<IdentifierInfo*,WeakInfo> 10077 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 10078 } 10079} 10080 10081void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 10082 IdentifierInfo* AliasName, 10083 SourceLocation PragmaLoc, 10084 SourceLocation NameLoc, 10085 SourceLocation AliasNameLoc) { 10086 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 10087 LookupOrdinaryName); 10088 WeakInfo W = WeakInfo(Name, NameLoc); 10089 10090 if (PrevDecl) { 10091 if (!PrevDecl->hasAttr<AliasAttr>()) 10092 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 10093 DeclApplyPragmaWeak(TUScope, ND, W); 10094 } else { 10095 (void)WeakUndeclaredIdentifiers.insert( 10096 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 10097 } 10098} 10099 10100Decl *Sema::getObjCDeclContext() const { 10101 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 10102} 10103 10104AvailabilityResult Sema::getCurContextAvailability() const { 10105 const Decl *D = cast<Decl>(getCurLexicalContext()); 10106 // A category implicitly has the availability of the interface. 10107 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 10108 D = CatD->getClassInterface(); 10109 10110 return D->getAvailability(); 10111} 10112