SemaDecl.cpp revision 509fb3e2cdf31a0be375eb74bedfddeb648f7d36
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 1252void Sema::ActOnStartFunctionDeclarator() { 1253 ++InFunctionDeclarator; 1254} 1255 1256void Sema::ActOnEndFunctionDeclarator() { 1257 assert(InFunctionDeclarator); 1258 --InFunctionDeclarator; 1259} 1260 1261/// \brief Look for an Objective-C class in the translation unit. 1262/// 1263/// \param Id The name of the Objective-C class we're looking for. If 1264/// typo-correction fixes this name, the Id will be updated 1265/// to the fixed name. 1266/// 1267/// \param IdLoc The location of the name in the translation unit. 1268/// 1269/// \param TypoCorrection If true, this routine will attempt typo correction 1270/// if there is no class with the given name. 1271/// 1272/// \returns The declaration of the named Objective-C class, or NULL if the 1273/// class could not be found. 1274ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1275 SourceLocation IdLoc, 1276 bool DoTypoCorrection) { 1277 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1278 // creation from this context. 1279 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1280 1281 if (!IDecl && DoTypoCorrection) { 1282 // Perform typo correction at the given location, but only if we 1283 // find an Objective-C class name. 1284 DeclFilterCCC<ObjCInterfaceDecl> Validator; 1285 if (TypoCorrection C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), 1286 LookupOrdinaryName, TUScope, NULL, 1287 Validator)) { 1288 IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>(); 1289 Diag(IdLoc, diag::err_undef_interface_suggest) 1290 << Id << IDecl->getDeclName() 1291 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1292 Diag(IDecl->getLocation(), diag::note_previous_decl) 1293 << IDecl->getDeclName(); 1294 1295 Id = IDecl->getIdentifier(); 1296 } 1297 } 1298 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1299 // This routine must always return a class definition, if any. 1300 if (Def && Def->getDefinition()) 1301 Def = Def->getDefinition(); 1302 return Def; 1303} 1304 1305/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1306/// from S, where a non-field would be declared. This routine copes 1307/// with the difference between C and C++ scoping rules in structs and 1308/// unions. For example, the following code is well-formed in C but 1309/// ill-formed in C++: 1310/// @code 1311/// struct S6 { 1312/// enum { BAR } e; 1313/// }; 1314/// 1315/// void test_S6() { 1316/// struct S6 a; 1317/// a.e = BAR; 1318/// } 1319/// @endcode 1320/// For the declaration of BAR, this routine will return a different 1321/// scope. The scope S will be the scope of the unnamed enumeration 1322/// within S6. In C++, this routine will return the scope associated 1323/// with S6, because the enumeration's scope is a transparent 1324/// context but structures can contain non-field names. In C, this 1325/// routine will return the translation unit scope, since the 1326/// enumeration's scope is a transparent context and structures cannot 1327/// contain non-field names. 1328Scope *Sema::getNonFieldDeclScope(Scope *S) { 1329 while (((S->getFlags() & Scope::DeclScope) == 0) || 1330 (S->getEntity() && 1331 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1332 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1333 S = S->getParent(); 1334 return S; 1335} 1336 1337/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1338/// file scope. lazily create a decl for it. ForRedeclaration is true 1339/// if we're creating this built-in in anticipation of redeclaring the 1340/// built-in. 1341NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1342 Scope *S, bool ForRedeclaration, 1343 SourceLocation Loc) { 1344 Builtin::ID BID = (Builtin::ID)bid; 1345 1346 ASTContext::GetBuiltinTypeError Error; 1347 QualType R = Context.GetBuiltinType(BID, Error); 1348 switch (Error) { 1349 case ASTContext::GE_None: 1350 // Okay 1351 break; 1352 1353 case ASTContext::GE_Missing_stdio: 1354 if (ForRedeclaration) 1355 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1356 << Context.BuiltinInfo.GetName(BID); 1357 return 0; 1358 1359 case ASTContext::GE_Missing_setjmp: 1360 if (ForRedeclaration) 1361 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1362 << Context.BuiltinInfo.GetName(BID); 1363 return 0; 1364 1365 case ASTContext::GE_Missing_ucontext: 1366 if (ForRedeclaration) 1367 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1368 << Context.BuiltinInfo.GetName(BID); 1369 return 0; 1370 } 1371 1372 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1373 Diag(Loc, diag::ext_implicit_lib_function_decl) 1374 << Context.BuiltinInfo.GetName(BID) 1375 << R; 1376 if (Context.BuiltinInfo.getHeaderName(BID) && 1377 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1378 != DiagnosticsEngine::Ignored) 1379 Diag(Loc, diag::note_please_include_header) 1380 << Context.BuiltinInfo.getHeaderName(BID) 1381 << Context.BuiltinInfo.GetName(BID); 1382 } 1383 1384 FunctionDecl *New = FunctionDecl::Create(Context, 1385 Context.getTranslationUnitDecl(), 1386 Loc, Loc, II, R, /*TInfo=*/0, 1387 SC_Extern, 1388 SC_None, false, 1389 /*hasPrototype=*/true); 1390 New->setImplicit(); 1391 1392 // Create Decl objects for each parameter, adding them to the 1393 // FunctionDecl. 1394 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1395 SmallVector<ParmVarDecl*, 16> Params; 1396 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1397 ParmVarDecl *parm = 1398 ParmVarDecl::Create(Context, New, SourceLocation(), 1399 SourceLocation(), 0, 1400 FT->getArgType(i), /*TInfo=*/0, 1401 SC_None, SC_None, 0); 1402 parm->setScopeInfo(0, i); 1403 Params.push_back(parm); 1404 } 1405 New->setParams(Params); 1406 } 1407 1408 AddKnownFunctionAttributes(New); 1409 1410 // TUScope is the translation-unit scope to insert this function into. 1411 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1412 // relate Scopes to DeclContexts, and probably eliminate CurContext 1413 // entirely, but we're not there yet. 1414 DeclContext *SavedContext = CurContext; 1415 CurContext = Context.getTranslationUnitDecl(); 1416 PushOnScopeChains(New, TUScope); 1417 CurContext = SavedContext; 1418 return New; 1419} 1420 1421bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { 1422 QualType OldType; 1423 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1424 OldType = OldTypedef->getUnderlyingType(); 1425 else 1426 OldType = Context.getTypeDeclType(Old); 1427 QualType NewType = New->getUnderlyingType(); 1428 1429 if (NewType->isVariablyModifiedType()) { 1430 // Must not redefine a typedef with a variably-modified type. 1431 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1432 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef) 1433 << Kind << NewType; 1434 if (Old->getLocation().isValid()) 1435 Diag(Old->getLocation(), diag::note_previous_definition); 1436 New->setInvalidDecl(); 1437 return true; 1438 } 1439 1440 if (OldType != NewType && 1441 !OldType->isDependentType() && 1442 !NewType->isDependentType() && 1443 !Context.hasSameType(OldType, NewType)) { 1444 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1445 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1446 << Kind << NewType << OldType; 1447 if (Old->getLocation().isValid()) 1448 Diag(Old->getLocation(), diag::note_previous_definition); 1449 New->setInvalidDecl(); 1450 return true; 1451 } 1452 return false; 1453} 1454 1455/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1456/// same name and scope as a previous declaration 'Old'. Figure out 1457/// how to resolve this situation, merging decls or emitting 1458/// diagnostics as appropriate. If there was an error, set New to be invalid. 1459/// 1460void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1461 // If the new decl is known invalid already, don't bother doing any 1462 // merging checks. 1463 if (New->isInvalidDecl()) return; 1464 1465 // Allow multiple definitions for ObjC built-in typedefs. 1466 // FIXME: Verify the underlying types are equivalent! 1467 if (getLangOptions().ObjC1) { 1468 const IdentifierInfo *TypeID = New->getIdentifier(); 1469 switch (TypeID->getLength()) { 1470 default: break; 1471 case 2: 1472 if (!TypeID->isStr("id")) 1473 break; 1474 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1475 // Install the built-in type for 'id', ignoring the current definition. 1476 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1477 return; 1478 case 5: 1479 if (!TypeID->isStr("Class")) 1480 break; 1481 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1482 // Install the built-in type for 'Class', ignoring the current definition. 1483 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1484 return; 1485 case 3: 1486 if (!TypeID->isStr("SEL")) 1487 break; 1488 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1489 // Install the built-in type for 'SEL', ignoring the current definition. 1490 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1491 return; 1492 } 1493 // Fall through - the typedef name was not a builtin type. 1494 } 1495 1496 // Verify the old decl was also a type. 1497 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1498 if (!Old) { 1499 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1500 << New->getDeclName(); 1501 1502 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1503 if (OldD->getLocation().isValid()) 1504 Diag(OldD->getLocation(), diag::note_previous_definition); 1505 1506 return New->setInvalidDecl(); 1507 } 1508 1509 // If the old declaration is invalid, just give up here. 1510 if (Old->isInvalidDecl()) 1511 return New->setInvalidDecl(); 1512 1513 // If the typedef types are not identical, reject them in all languages and 1514 // with any extensions enabled. 1515 if (isIncompatibleTypedef(Old, New)) 1516 return; 1517 1518 // The types match. Link up the redeclaration chain if the old 1519 // declaration was a typedef. 1520 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1521 New->setPreviousDeclaration(Typedef); 1522 1523 if (getLangOptions().MicrosoftExt) 1524 return; 1525 1526 if (getLangOptions().CPlusPlus) { 1527 // C++ [dcl.typedef]p2: 1528 // In a given non-class scope, a typedef specifier can be used to 1529 // redefine the name of any type declared in that scope to refer 1530 // to the type to which it already refers. 1531 if (!isa<CXXRecordDecl>(CurContext)) 1532 return; 1533 1534 // C++0x [dcl.typedef]p4: 1535 // In a given class scope, a typedef specifier can be used to redefine 1536 // any class-name declared in that scope that is not also a typedef-name 1537 // to refer to the type to which it already refers. 1538 // 1539 // This wording came in via DR424, which was a correction to the 1540 // wording in DR56, which accidentally banned code like: 1541 // 1542 // struct S { 1543 // typedef struct A { } A; 1544 // }; 1545 // 1546 // in the C++03 standard. We implement the C++0x semantics, which 1547 // allow the above but disallow 1548 // 1549 // struct S { 1550 // typedef int I; 1551 // typedef int I; 1552 // }; 1553 // 1554 // since that was the intent of DR56. 1555 if (!isa<TypedefNameDecl>(Old)) 1556 return; 1557 1558 Diag(New->getLocation(), diag::err_redefinition) 1559 << New->getDeclName(); 1560 Diag(Old->getLocation(), diag::note_previous_definition); 1561 return New->setInvalidDecl(); 1562 } 1563 1564 // Modules always permit redefinition of typedefs, as does C11. 1565 if (getLangOptions().Modules || getLangOptions().C11) 1566 return; 1567 1568 // If we have a redefinition of a typedef in C, emit a warning. This warning 1569 // is normally mapped to an error, but can be controlled with 1570 // -Wtypedef-redefinition. If either the original or the redefinition is 1571 // in a system header, don't emit this for compatibility with GCC. 1572 if (getDiagnostics().getSuppressSystemWarnings() && 1573 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1574 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1575 return; 1576 1577 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1578 << New->getDeclName(); 1579 Diag(Old->getLocation(), diag::note_previous_definition); 1580 return; 1581} 1582 1583/// DeclhasAttr - returns true if decl Declaration already has the target 1584/// attribute. 1585static bool 1586DeclHasAttr(const Decl *D, const Attr *A) { 1587 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1588 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1589 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1590 if ((*i)->getKind() == A->getKind()) { 1591 if (Ann) { 1592 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1593 return true; 1594 continue; 1595 } 1596 // FIXME: Don't hardcode this check 1597 if (OA && isa<OwnershipAttr>(*i)) 1598 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1599 return true; 1600 } 1601 1602 return false; 1603} 1604 1605/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1606void Sema::mergeDeclAttributes(Decl *New, Decl *Old, 1607 bool MergeDeprecation) { 1608 if (!Old->hasAttrs()) 1609 return; 1610 1611 bool foundAny = New->hasAttrs(); 1612 1613 // Ensure that any moving of objects within the allocated map is done before 1614 // we process them. 1615 if (!foundAny) New->setAttrs(AttrVec()); 1616 1617 for (specific_attr_iterator<InheritableAttr> 1618 i = Old->specific_attr_begin<InheritableAttr>(), 1619 e = Old->specific_attr_end<InheritableAttr>(); 1620 i != e; ++i) { 1621 // Ignore deprecated/unavailable/availability attributes if requested. 1622 if (!MergeDeprecation && 1623 (isa<DeprecatedAttr>(*i) || 1624 isa<UnavailableAttr>(*i) || 1625 isa<AvailabilityAttr>(*i))) 1626 continue; 1627 1628 if (!DeclHasAttr(New, *i)) { 1629 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(Context)); 1630 newAttr->setInherited(true); 1631 New->addAttr(newAttr); 1632 foundAny = true; 1633 } 1634 } 1635 1636 if (!foundAny) New->dropAttrs(); 1637} 1638 1639/// mergeParamDeclAttributes - Copy attributes from the old parameter 1640/// to the new one. 1641static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1642 const ParmVarDecl *oldDecl, 1643 ASTContext &C) { 1644 if (!oldDecl->hasAttrs()) 1645 return; 1646 1647 bool foundAny = newDecl->hasAttrs(); 1648 1649 // Ensure that any moving of objects within the allocated map is 1650 // done before we process them. 1651 if (!foundAny) newDecl->setAttrs(AttrVec()); 1652 1653 for (specific_attr_iterator<InheritableParamAttr> 1654 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1655 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1656 if (!DeclHasAttr(newDecl, *i)) { 1657 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1658 newAttr->setInherited(true); 1659 newDecl->addAttr(newAttr); 1660 foundAny = true; 1661 } 1662 } 1663 1664 if (!foundAny) newDecl->dropAttrs(); 1665} 1666 1667namespace { 1668 1669/// Used in MergeFunctionDecl to keep track of function parameters in 1670/// C. 1671struct GNUCompatibleParamWarning { 1672 ParmVarDecl *OldParm; 1673 ParmVarDecl *NewParm; 1674 QualType PromotedType; 1675}; 1676 1677} 1678 1679/// getSpecialMember - get the special member enum for a method. 1680Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1681 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1682 if (Ctor->isDefaultConstructor()) 1683 return Sema::CXXDefaultConstructor; 1684 1685 if (Ctor->isCopyConstructor()) 1686 return Sema::CXXCopyConstructor; 1687 1688 if (Ctor->isMoveConstructor()) 1689 return Sema::CXXMoveConstructor; 1690 } else if (isa<CXXDestructorDecl>(MD)) { 1691 return Sema::CXXDestructor; 1692 } else if (MD->isCopyAssignmentOperator()) { 1693 return Sema::CXXCopyAssignment; 1694 } else if (MD->isMoveAssignmentOperator()) { 1695 return Sema::CXXMoveAssignment; 1696 } 1697 1698 return Sema::CXXInvalid; 1699} 1700 1701/// canRedefineFunction - checks if a function can be redefined. Currently, 1702/// only extern inline functions can be redefined, and even then only in 1703/// GNU89 mode. 1704static bool canRedefineFunction(const FunctionDecl *FD, 1705 const LangOptions& LangOpts) { 1706 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1707 !LangOpts.CPlusPlus && 1708 FD->isInlineSpecified() && 1709 FD->getStorageClass() == SC_Extern); 1710} 1711 1712/// MergeFunctionDecl - We just parsed a function 'New' from 1713/// declarator D which has the same name and scope as a previous 1714/// declaration 'Old'. Figure out how to resolve this situation, 1715/// merging decls or emitting diagnostics as appropriate. 1716/// 1717/// In C++, New and Old must be declarations that are not 1718/// overloaded. Use IsOverload to determine whether New and Old are 1719/// overloaded, and to select the Old declaration that New should be 1720/// merged with. 1721/// 1722/// Returns true if there was an error, false otherwise. 1723bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1724 // Verify the old decl was also a function. 1725 FunctionDecl *Old = 0; 1726 if (FunctionTemplateDecl *OldFunctionTemplate 1727 = dyn_cast<FunctionTemplateDecl>(OldD)) 1728 Old = OldFunctionTemplate->getTemplatedDecl(); 1729 else 1730 Old = dyn_cast<FunctionDecl>(OldD); 1731 if (!Old) { 1732 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1733 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1734 Diag(Shadow->getTargetDecl()->getLocation(), 1735 diag::note_using_decl_target); 1736 Diag(Shadow->getUsingDecl()->getLocation(), 1737 diag::note_using_decl) << 0; 1738 return true; 1739 } 1740 1741 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1742 << New->getDeclName(); 1743 Diag(OldD->getLocation(), diag::note_previous_definition); 1744 return true; 1745 } 1746 1747 // Determine whether the previous declaration was a definition, 1748 // implicit declaration, or a declaration. 1749 diag::kind PrevDiag; 1750 if (Old->isThisDeclarationADefinition()) 1751 PrevDiag = diag::note_previous_definition; 1752 else if (Old->isImplicit()) 1753 PrevDiag = diag::note_previous_implicit_declaration; 1754 else 1755 PrevDiag = diag::note_previous_declaration; 1756 1757 QualType OldQType = Context.getCanonicalType(Old->getType()); 1758 QualType NewQType = Context.getCanonicalType(New->getType()); 1759 1760 // Don't complain about this if we're in GNU89 mode and the old function 1761 // is an extern inline function. 1762 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1763 New->getStorageClass() == SC_Static && 1764 Old->getStorageClass() != SC_Static && 1765 !canRedefineFunction(Old, getLangOptions())) { 1766 if (getLangOptions().MicrosoftExt) { 1767 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1768 Diag(Old->getLocation(), PrevDiag); 1769 } else { 1770 Diag(New->getLocation(), diag::err_static_non_static) << New; 1771 Diag(Old->getLocation(), PrevDiag); 1772 return true; 1773 } 1774 } 1775 1776 // If a function is first declared with a calling convention, but is 1777 // later declared or defined without one, the second decl assumes the 1778 // calling convention of the first. 1779 // 1780 // For the new decl, we have to look at the NON-canonical type to tell the 1781 // difference between a function that really doesn't have a calling 1782 // convention and one that is declared cdecl. That's because in 1783 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1784 // because it is the default calling convention. 1785 // 1786 // Note also that we DO NOT return at this point, because we still have 1787 // other tests to run. 1788 const FunctionType *OldType = cast<FunctionType>(OldQType); 1789 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1790 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1791 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1792 bool RequiresAdjustment = false; 1793 if (OldTypeInfo.getCC() != CC_Default && 1794 NewTypeInfo.getCC() == CC_Default) { 1795 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1796 RequiresAdjustment = true; 1797 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1798 NewTypeInfo.getCC())) { 1799 // Calling conventions really aren't compatible, so complain. 1800 Diag(New->getLocation(), diag::err_cconv_change) 1801 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1802 << (OldTypeInfo.getCC() == CC_Default) 1803 << (OldTypeInfo.getCC() == CC_Default ? "" : 1804 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1805 Diag(Old->getLocation(), diag::note_previous_declaration); 1806 return true; 1807 } 1808 1809 // FIXME: diagnose the other way around? 1810 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1811 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1812 RequiresAdjustment = true; 1813 } 1814 1815 // Merge regparm attribute. 1816 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1817 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1818 if (NewTypeInfo.getHasRegParm()) { 1819 Diag(New->getLocation(), diag::err_regparm_mismatch) 1820 << NewType->getRegParmType() 1821 << OldType->getRegParmType(); 1822 Diag(Old->getLocation(), diag::note_previous_declaration); 1823 return true; 1824 } 1825 1826 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1827 RequiresAdjustment = true; 1828 } 1829 1830 // Merge ns_returns_retained attribute. 1831 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1832 if (NewTypeInfo.getProducesResult()) { 1833 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1834 Diag(Old->getLocation(), diag::note_previous_declaration); 1835 return true; 1836 } 1837 1838 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1839 RequiresAdjustment = true; 1840 } 1841 1842 if (RequiresAdjustment) { 1843 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1844 New->setType(QualType(NewType, 0)); 1845 NewQType = Context.getCanonicalType(New->getType()); 1846 } 1847 1848 if (getLangOptions().CPlusPlus) { 1849 // (C++98 13.1p2): 1850 // Certain function declarations cannot be overloaded: 1851 // -- Function declarations that differ only in the return type 1852 // cannot be overloaded. 1853 QualType OldReturnType = OldType->getResultType(); 1854 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1855 QualType ResQT; 1856 if (OldReturnType != NewReturnType) { 1857 if (NewReturnType->isObjCObjectPointerType() 1858 && OldReturnType->isObjCObjectPointerType()) 1859 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1860 if (ResQT.isNull()) { 1861 if (New->isCXXClassMember() && New->isOutOfLine()) 1862 Diag(New->getLocation(), 1863 diag::err_member_def_does_not_match_ret_type) << New; 1864 else 1865 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1866 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1867 return true; 1868 } 1869 else 1870 NewQType = ResQT; 1871 } 1872 1873 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1874 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1875 if (OldMethod && NewMethod) { 1876 // Preserve triviality. 1877 NewMethod->setTrivial(OldMethod->isTrivial()); 1878 1879 // MSVC allows explicit template specialization at class scope: 1880 // 2 CXMethodDecls referring to the same function will be injected. 1881 // We don't want a redeclartion error. 1882 bool IsClassScopeExplicitSpecialization = 1883 OldMethod->isFunctionTemplateSpecialization() && 1884 NewMethod->isFunctionTemplateSpecialization(); 1885 bool isFriend = NewMethod->getFriendObjectKind(); 1886 1887 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1888 !IsClassScopeExplicitSpecialization) { 1889 // -- Member function declarations with the same name and the 1890 // same parameter types cannot be overloaded if any of them 1891 // is a static member function declaration. 1892 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1893 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1894 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1895 return true; 1896 } 1897 1898 // C++ [class.mem]p1: 1899 // [...] A member shall not be declared twice in the 1900 // member-specification, except that a nested class or member 1901 // class template can be declared and then later defined. 1902 unsigned NewDiag; 1903 if (isa<CXXConstructorDecl>(OldMethod)) 1904 NewDiag = diag::err_constructor_redeclared; 1905 else if (isa<CXXDestructorDecl>(NewMethod)) 1906 NewDiag = diag::err_destructor_redeclared; 1907 else if (isa<CXXConversionDecl>(NewMethod)) 1908 NewDiag = diag::err_conv_function_redeclared; 1909 else 1910 NewDiag = diag::err_member_redeclared; 1911 1912 Diag(New->getLocation(), NewDiag); 1913 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1914 1915 // Complain if this is an explicit declaration of a special 1916 // member that was initially declared implicitly. 1917 // 1918 // As an exception, it's okay to befriend such methods in order 1919 // to permit the implicit constructor/destructor/operator calls. 1920 } else if (OldMethod->isImplicit()) { 1921 if (isFriend) { 1922 NewMethod->setImplicit(); 1923 } else { 1924 Diag(NewMethod->getLocation(), 1925 diag::err_definition_of_implicitly_declared_member) 1926 << New << getSpecialMember(OldMethod); 1927 return true; 1928 } 1929 } else if (OldMethod->isExplicitlyDefaulted()) { 1930 Diag(NewMethod->getLocation(), 1931 diag::err_definition_of_explicitly_defaulted_member) 1932 << getSpecialMember(OldMethod); 1933 return true; 1934 } 1935 } 1936 1937 // (C++98 8.3.5p3): 1938 // All declarations for a function shall agree exactly in both the 1939 // return type and the parameter-type-list. 1940 // We also want to respect all the extended bits except noreturn. 1941 1942 // noreturn should now match unless the old type info didn't have it. 1943 QualType OldQTypeForComparison = OldQType; 1944 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1945 assert(OldQType == QualType(OldType, 0)); 1946 const FunctionType *OldTypeForComparison 1947 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1948 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1949 assert(OldQTypeForComparison.isCanonical()); 1950 } 1951 1952 if (OldQTypeForComparison == NewQType) 1953 return MergeCompatibleFunctionDecls(New, Old); 1954 1955 // Fall through for conflicting redeclarations and redefinitions. 1956 } 1957 1958 // C: Function types need to be compatible, not identical. This handles 1959 // duplicate function decls like "void f(int); void f(enum X);" properly. 1960 if (!getLangOptions().CPlusPlus && 1961 Context.typesAreCompatible(OldQType, NewQType)) { 1962 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1963 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1964 const FunctionProtoType *OldProto = 0; 1965 if (isa<FunctionNoProtoType>(NewFuncType) && 1966 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1967 // The old declaration provided a function prototype, but the 1968 // new declaration does not. Merge in the prototype. 1969 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1970 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1971 OldProto->arg_type_end()); 1972 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1973 ParamTypes.data(), ParamTypes.size(), 1974 OldProto->getExtProtoInfo()); 1975 New->setType(NewQType); 1976 New->setHasInheritedPrototype(); 1977 1978 // Synthesize a parameter for each argument type. 1979 SmallVector<ParmVarDecl*, 16> Params; 1980 for (FunctionProtoType::arg_type_iterator 1981 ParamType = OldProto->arg_type_begin(), 1982 ParamEnd = OldProto->arg_type_end(); 1983 ParamType != ParamEnd; ++ParamType) { 1984 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1985 SourceLocation(), 1986 SourceLocation(), 0, 1987 *ParamType, /*TInfo=*/0, 1988 SC_None, SC_None, 1989 0); 1990 Param->setScopeInfo(0, Params.size()); 1991 Param->setImplicit(); 1992 Params.push_back(Param); 1993 } 1994 1995 New->setParams(Params); 1996 } 1997 1998 return MergeCompatibleFunctionDecls(New, Old); 1999 } 2000 2001 // GNU C permits a K&R definition to follow a prototype declaration 2002 // if the declared types of the parameters in the K&R definition 2003 // match the types in the prototype declaration, even when the 2004 // promoted types of the parameters from the K&R definition differ 2005 // from the types in the prototype. GCC then keeps the types from 2006 // the prototype. 2007 // 2008 // If a variadic prototype is followed by a non-variadic K&R definition, 2009 // the K&R definition becomes variadic. This is sort of an edge case, but 2010 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 2011 // C99 6.9.1p8. 2012 if (!getLangOptions().CPlusPlus && 2013 Old->hasPrototype() && !New->hasPrototype() && 2014 New->getType()->getAs<FunctionProtoType>() && 2015 Old->getNumParams() == New->getNumParams()) { 2016 SmallVector<QualType, 16> ArgTypes; 2017 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 2018 const FunctionProtoType *OldProto 2019 = Old->getType()->getAs<FunctionProtoType>(); 2020 const FunctionProtoType *NewProto 2021 = New->getType()->getAs<FunctionProtoType>(); 2022 2023 // Determine whether this is the GNU C extension. 2024 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 2025 NewProto->getResultType()); 2026 bool LooseCompatible = !MergedReturn.isNull(); 2027 for (unsigned Idx = 0, End = Old->getNumParams(); 2028 LooseCompatible && Idx != End; ++Idx) { 2029 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 2030 ParmVarDecl *NewParm = New->getParamDecl(Idx); 2031 if (Context.typesAreCompatible(OldParm->getType(), 2032 NewProto->getArgType(Idx))) { 2033 ArgTypes.push_back(NewParm->getType()); 2034 } else if (Context.typesAreCompatible(OldParm->getType(), 2035 NewParm->getType(), 2036 /*CompareUnqualified=*/true)) { 2037 GNUCompatibleParamWarning Warn 2038 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 2039 Warnings.push_back(Warn); 2040 ArgTypes.push_back(NewParm->getType()); 2041 } else 2042 LooseCompatible = false; 2043 } 2044 2045 if (LooseCompatible) { 2046 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 2047 Diag(Warnings[Warn].NewParm->getLocation(), 2048 diag::ext_param_promoted_not_compatible_with_prototype) 2049 << Warnings[Warn].PromotedType 2050 << Warnings[Warn].OldParm->getType(); 2051 if (Warnings[Warn].OldParm->getLocation().isValid()) 2052 Diag(Warnings[Warn].OldParm->getLocation(), 2053 diag::note_previous_declaration); 2054 } 2055 2056 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 2057 ArgTypes.size(), 2058 OldProto->getExtProtoInfo())); 2059 return MergeCompatibleFunctionDecls(New, Old); 2060 } 2061 2062 // Fall through to diagnose conflicting types. 2063 } 2064 2065 // A function that has already been declared has been redeclared or defined 2066 // with a different type- show appropriate diagnostic 2067 if (unsigned BuiltinID = Old->getBuiltinID()) { 2068 // The user has declared a builtin function with an incompatible 2069 // signature. 2070 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2071 // The function the user is redeclaring is a library-defined 2072 // function like 'malloc' or 'printf'. Warn about the 2073 // redeclaration, then pretend that we don't know about this 2074 // library built-in. 2075 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2076 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2077 << Old << Old->getType(); 2078 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2079 Old->setInvalidDecl(); 2080 return false; 2081 } 2082 2083 PrevDiag = diag::note_previous_builtin_declaration; 2084 } 2085 2086 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2087 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2088 return true; 2089} 2090 2091/// \brief Completes the merge of two function declarations that are 2092/// known to be compatible. 2093/// 2094/// This routine handles the merging of attributes and other 2095/// properties of function declarations form the old declaration to 2096/// the new declaration, once we know that New is in fact a 2097/// redeclaration of Old. 2098/// 2099/// \returns false 2100bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2101 // Merge the attributes 2102 mergeDeclAttributes(New, Old); 2103 2104 // Merge the storage class. 2105 if (Old->getStorageClass() != SC_Extern && 2106 Old->getStorageClass() != SC_None) 2107 New->setStorageClass(Old->getStorageClass()); 2108 2109 // Merge "pure" flag. 2110 if (Old->isPure()) 2111 New->setPure(); 2112 2113 // Merge attributes from the parameters. These can mismatch with K&R 2114 // declarations. 2115 if (New->getNumParams() == Old->getNumParams()) 2116 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2117 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2118 Context); 2119 2120 if (getLangOptions().CPlusPlus) 2121 return MergeCXXFunctionDecl(New, Old); 2122 2123 return false; 2124} 2125 2126 2127void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2128 ObjCMethodDecl *oldMethod) { 2129 // We don't want to merge unavailable and deprecated attributes 2130 // except from interface to implementation. 2131 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2132 2133 // Merge the attributes. 2134 mergeDeclAttributes(newMethod, oldMethod, mergeDeprecation); 2135 2136 // Merge attributes from the parameters. 2137 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2138 for (ObjCMethodDecl::param_iterator 2139 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2140 ni != ne; ++ni, ++oi) 2141 mergeParamDeclAttributes(*ni, *oi, Context); 2142 2143 CheckObjCMethodOverride(newMethod, oldMethod, true); 2144} 2145 2146/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2147/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2148/// emitting diagnostics as appropriate. 2149/// 2150/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2151/// to here in AddInitializerToDecl. We can't check them before the initializer 2152/// is attached. 2153void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2154 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2155 return; 2156 2157 QualType MergedT; 2158 if (getLangOptions().CPlusPlus) { 2159 AutoType *AT = New->getType()->getContainedAutoType(); 2160 if (AT && !AT->isDeduced()) { 2161 // We don't know what the new type is until the initializer is attached. 2162 return; 2163 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2164 // These could still be something that needs exception specs checked. 2165 return MergeVarDeclExceptionSpecs(New, Old); 2166 } 2167 // C++ [basic.link]p10: 2168 // [...] the types specified by all declarations referring to a given 2169 // object or function shall be identical, except that declarations for an 2170 // array object can specify array types that differ by the presence or 2171 // absence of a major array bound (8.3.4). 2172 else if (Old->getType()->isIncompleteArrayType() && 2173 New->getType()->isArrayType()) { 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 = New->getType(); 2180 } else if (Old->getType()->isArrayType() && 2181 New->getType()->isIncompleteArrayType()) { 2182 CanQual<ArrayType> OldArray 2183 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2184 CanQual<ArrayType> NewArray 2185 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2186 if (OldArray->getElementType() == NewArray->getElementType()) 2187 MergedT = Old->getType(); 2188 } else if (New->getType()->isObjCObjectPointerType() 2189 && Old->getType()->isObjCObjectPointerType()) { 2190 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2191 Old->getType()); 2192 } 2193 } else { 2194 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2195 } 2196 if (MergedT.isNull()) { 2197 Diag(New->getLocation(), diag::err_redefinition_different_type) 2198 << New->getDeclName(); 2199 Diag(Old->getLocation(), diag::note_previous_definition); 2200 return New->setInvalidDecl(); 2201 } 2202 New->setType(MergedT); 2203} 2204 2205/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2206/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2207/// situation, merging decls or emitting diagnostics as appropriate. 2208/// 2209/// Tentative definition rules (C99 6.9.2p2) are checked by 2210/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2211/// definitions here, since the initializer hasn't been attached. 2212/// 2213void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2214 // If the new decl is already invalid, don't do any other checking. 2215 if (New->isInvalidDecl()) 2216 return; 2217 2218 // Verify the old decl was also a variable. 2219 VarDecl *Old = 0; 2220 if (!Previous.isSingleResult() || 2221 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2222 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2223 << New->getDeclName(); 2224 Diag(Previous.getRepresentativeDecl()->getLocation(), 2225 diag::note_previous_definition); 2226 return New->setInvalidDecl(); 2227 } 2228 2229 // C++ [class.mem]p1: 2230 // A member shall not be declared twice in the member-specification [...] 2231 // 2232 // Here, we need only consider static data members. 2233 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2234 Diag(New->getLocation(), diag::err_duplicate_member) 2235 << New->getIdentifier(); 2236 Diag(Old->getLocation(), diag::note_previous_declaration); 2237 New->setInvalidDecl(); 2238 } 2239 2240 mergeDeclAttributes(New, Old); 2241 // Warn if an already-declared variable is made a weak_import in a subsequent 2242 // declaration 2243 if (New->getAttr<WeakImportAttr>() && 2244 Old->getStorageClass() == SC_None && 2245 !Old->getAttr<WeakImportAttr>()) { 2246 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2247 Diag(Old->getLocation(), diag::note_previous_definition); 2248 // Remove weak_import attribute on new declaration. 2249 New->dropAttr<WeakImportAttr>(); 2250 } 2251 2252 // Merge the types. 2253 MergeVarDeclTypes(New, Old); 2254 if (New->isInvalidDecl()) 2255 return; 2256 2257 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2258 if (New->getStorageClass() == SC_Static && 2259 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2260 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2261 Diag(Old->getLocation(), diag::note_previous_definition); 2262 return New->setInvalidDecl(); 2263 } 2264 // C99 6.2.2p4: 2265 // For an identifier declared with the storage-class specifier 2266 // extern in a scope in which a prior declaration of that 2267 // identifier is visible,23) if the prior declaration specifies 2268 // internal or external linkage, the linkage of the identifier at 2269 // the later declaration is the same as the linkage specified at 2270 // the prior declaration. If no prior declaration is visible, or 2271 // if the prior declaration specifies no linkage, then the 2272 // identifier has external linkage. 2273 if (New->hasExternalStorage() && Old->hasLinkage()) 2274 /* Okay */; 2275 else if (New->getStorageClass() != SC_Static && 2276 Old->getStorageClass() == SC_Static) { 2277 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2278 Diag(Old->getLocation(), diag::note_previous_definition); 2279 return New->setInvalidDecl(); 2280 } 2281 2282 // Check if extern is followed by non-extern and vice-versa. 2283 if (New->hasExternalStorage() && 2284 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2285 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2286 Diag(Old->getLocation(), diag::note_previous_definition); 2287 return New->setInvalidDecl(); 2288 } 2289 if (Old->hasExternalStorage() && 2290 !New->hasLinkage() && New->isLocalVarDecl()) { 2291 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2292 Diag(Old->getLocation(), diag::note_previous_definition); 2293 return New->setInvalidDecl(); 2294 } 2295 2296 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2297 2298 // FIXME: The test for external storage here seems wrong? We still 2299 // need to check for mismatches. 2300 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2301 // Don't complain about out-of-line definitions of static members. 2302 !(Old->getLexicalDeclContext()->isRecord() && 2303 !New->getLexicalDeclContext()->isRecord())) { 2304 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2305 Diag(Old->getLocation(), diag::note_previous_definition); 2306 return New->setInvalidDecl(); 2307 } 2308 2309 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2310 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2311 Diag(Old->getLocation(), diag::note_previous_definition); 2312 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2313 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2314 Diag(Old->getLocation(), diag::note_previous_definition); 2315 } 2316 2317 // C++ doesn't have tentative definitions, so go right ahead and check here. 2318 const VarDecl *Def; 2319 if (getLangOptions().CPlusPlus && 2320 New->isThisDeclarationADefinition() == VarDecl::Definition && 2321 (Def = Old->getDefinition())) { 2322 Diag(New->getLocation(), diag::err_redefinition) 2323 << New->getDeclName(); 2324 Diag(Def->getLocation(), diag::note_previous_definition); 2325 New->setInvalidDecl(); 2326 return; 2327 } 2328 // c99 6.2.2 P4. 2329 // For an identifier declared with the storage-class specifier extern in a 2330 // scope in which a prior declaration of that identifier is visible, if 2331 // the prior declaration specifies internal or external linkage, the linkage 2332 // of the identifier at the later declaration is the same as the linkage 2333 // specified at the prior declaration. 2334 // FIXME. revisit this code. 2335 if (New->hasExternalStorage() && 2336 Old->getLinkage() == InternalLinkage && 2337 New->getDeclContext() == Old->getDeclContext()) 2338 New->setStorageClass(Old->getStorageClass()); 2339 2340 // Keep a chain of previous declarations. 2341 New->setPreviousDeclaration(Old); 2342 2343 // Inherit access appropriately. 2344 New->setAccess(Old->getAccess()); 2345} 2346 2347/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2348/// no declarator (e.g. "struct foo;") is parsed. 2349Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2350 DeclSpec &DS) { 2351 return ParsedFreeStandingDeclSpec(S, AS, DS, 2352 MultiTemplateParamsArg(*this, 0, 0)); 2353} 2354 2355/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2356/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2357/// parameters to cope with template friend declarations. 2358Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2359 DeclSpec &DS, 2360 MultiTemplateParamsArg TemplateParams) { 2361 Decl *TagD = 0; 2362 TagDecl *Tag = 0; 2363 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2364 DS.getTypeSpecType() == DeclSpec::TST_struct || 2365 DS.getTypeSpecType() == DeclSpec::TST_union || 2366 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2367 TagD = DS.getRepAsDecl(); 2368 2369 if (!TagD) // We probably had an error 2370 return 0; 2371 2372 // Note that the above type specs guarantee that the 2373 // type rep is a Decl, whereas in many of the others 2374 // it's a Type. 2375 if (isa<TagDecl>(TagD)) 2376 Tag = cast<TagDecl>(TagD); 2377 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2378 Tag = CTD->getTemplatedDecl(); 2379 } 2380 2381 if (Tag) 2382 Tag->setFreeStanding(); 2383 2384 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2385 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2386 // or incomplete types shall not be restrict-qualified." 2387 if (TypeQuals & DeclSpec::TQ_restrict) 2388 Diag(DS.getRestrictSpecLoc(), 2389 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2390 << DS.getSourceRange(); 2391 } 2392 2393 if (DS.isConstexprSpecified()) { 2394 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2395 // and definitions of functions and variables. 2396 if (Tag) 2397 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2398 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2399 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2400 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2401 else 2402 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2403 // Don't emit warnings after this error. 2404 return TagD; 2405 } 2406 2407 if (DS.isFriendSpecified()) { 2408 // If we're dealing with a decl but not a TagDecl, assume that 2409 // whatever routines created it handled the friendship aspect. 2410 if (TagD && !Tag) 2411 return 0; 2412 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2413 } 2414 2415 // Track whether we warned about the fact that there aren't any 2416 // declarators. 2417 bool emittedWarning = false; 2418 2419 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2420 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2421 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2422 if (getLangOptions().CPlusPlus || 2423 Record->getDeclContext()->isRecord()) 2424 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2425 2426 Diag(DS.getLocStart(), diag::ext_no_declarators) 2427 << DS.getSourceRange(); 2428 emittedWarning = true; 2429 } 2430 } 2431 2432 // Check for Microsoft C extension: anonymous struct. 2433 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2434 CurContext->isRecord() && 2435 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2436 // Handle 2 kinds of anonymous struct: 2437 // struct STRUCT; 2438 // and 2439 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2440 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2441 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2442 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2443 DS.getRepAsType().get()->isStructureType())) { 2444 Diag(DS.getLocStart(), diag::ext_ms_anonymous_struct) 2445 << DS.getSourceRange(); 2446 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2447 } 2448 } 2449 2450 if (getLangOptions().CPlusPlus && 2451 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2452 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2453 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2454 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2455 Diag(Enum->getLocation(), diag::ext_no_declarators) 2456 << DS.getSourceRange(); 2457 emittedWarning = true; 2458 } 2459 2460 // Skip all the checks below if we have a type error. 2461 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2462 2463 if (!DS.isMissingDeclaratorOk()) { 2464 // Warn about typedefs of enums without names, since this is an 2465 // extension in both Microsoft and GNU. 2466 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2467 Tag && isa<EnumDecl>(Tag)) { 2468 Diag(DS.getLocStart(), diag::ext_typedef_without_a_name) 2469 << DS.getSourceRange(); 2470 return Tag; 2471 } 2472 2473 Diag(DS.getLocStart(), diag::ext_no_declarators) 2474 << DS.getSourceRange(); 2475 emittedWarning = true; 2476 } 2477 2478 // We're going to complain about a bunch of spurious specifiers; 2479 // only do this if we're declaring a tag, because otherwise we 2480 // should be getting diag::ext_no_declarators. 2481 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2482 return TagD; 2483 2484 // Note that a linkage-specification sets a storage class, but 2485 // 'extern "C" struct foo;' is actually valid and not theoretically 2486 // useless. 2487 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2488 if (!DS.isExternInLinkageSpec()) 2489 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2490 << DeclSpec::getSpecifierName(scs); 2491 2492 if (DS.isThreadSpecified()) 2493 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2494 if (DS.getTypeQualifiers()) { 2495 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2496 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2497 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2498 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2499 // Restrict is covered above. 2500 } 2501 if (DS.isInlineSpecified()) 2502 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2503 if (DS.isVirtualSpecified()) 2504 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2505 if (DS.isExplicitSpecified()) 2506 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2507 2508 if (DS.isModulePrivateSpecified() && 2509 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2510 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2511 << Tag->getTagKind() 2512 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2513 2514 // Warn about ignored type attributes, for example: 2515 // __attribute__((aligned)) struct A; 2516 // Attributes should be placed after tag to apply to type declaration. 2517 if (!DS.getAttributes().empty()) { 2518 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2519 if (TypeSpecType == DeclSpec::TST_class || 2520 TypeSpecType == DeclSpec::TST_struct || 2521 TypeSpecType == DeclSpec::TST_union || 2522 TypeSpecType == DeclSpec::TST_enum) { 2523 AttributeList* attrs = DS.getAttributes().getList(); 2524 while (attrs) { 2525 Diag(attrs->getScopeLoc(), 2526 diag::warn_declspec_attribute_ignored) 2527 << attrs->getName() 2528 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2529 TypeSpecType == DeclSpec::TST_struct ? 1 : 2530 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2531 attrs = attrs->getNext(); 2532 } 2533 } 2534 } 2535 2536 return TagD; 2537} 2538 2539/// We are trying to inject an anonymous member into the given scope; 2540/// check if there's an existing declaration that can't be overloaded. 2541/// 2542/// \return true if this is a forbidden redeclaration 2543static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2544 Scope *S, 2545 DeclContext *Owner, 2546 DeclarationName Name, 2547 SourceLocation NameLoc, 2548 unsigned diagnostic) { 2549 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2550 Sema::ForRedeclaration); 2551 if (!SemaRef.LookupName(R, S)) return false; 2552 2553 if (R.getAsSingle<TagDecl>()) 2554 return false; 2555 2556 // Pick a representative declaration. 2557 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2558 assert(PrevDecl && "Expected a non-null Decl"); 2559 2560 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2561 return false; 2562 2563 SemaRef.Diag(NameLoc, diagnostic) << Name; 2564 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2565 2566 return true; 2567} 2568 2569/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2570/// anonymous struct or union AnonRecord into the owning context Owner 2571/// and scope S. This routine will be invoked just after we realize 2572/// that an unnamed union or struct is actually an anonymous union or 2573/// struct, e.g., 2574/// 2575/// @code 2576/// union { 2577/// int i; 2578/// float f; 2579/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2580/// // f into the surrounding scope.x 2581/// @endcode 2582/// 2583/// This routine is recursive, injecting the names of nested anonymous 2584/// structs/unions into the owning context and scope as well. 2585static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2586 DeclContext *Owner, 2587 RecordDecl *AnonRecord, 2588 AccessSpecifier AS, 2589 SmallVector<NamedDecl*, 2> &Chaining, 2590 bool MSAnonStruct) { 2591 unsigned diagKind 2592 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2593 : diag::err_anonymous_struct_member_redecl; 2594 2595 bool Invalid = false; 2596 2597 // Look every FieldDecl and IndirectFieldDecl with a name. 2598 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2599 DEnd = AnonRecord->decls_end(); 2600 D != DEnd; ++D) { 2601 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2602 cast<NamedDecl>(*D)->getDeclName()) { 2603 ValueDecl *VD = cast<ValueDecl>(*D); 2604 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2605 VD->getLocation(), diagKind)) { 2606 // C++ [class.union]p2: 2607 // The names of the members of an anonymous union shall be 2608 // distinct from the names of any other entity in the 2609 // scope in which the anonymous union is declared. 2610 Invalid = true; 2611 } else { 2612 // C++ [class.union]p2: 2613 // For the purpose of name lookup, after the anonymous union 2614 // definition, the members of the anonymous union are 2615 // considered to have been defined in the scope in which the 2616 // anonymous union is declared. 2617 unsigned OldChainingSize = Chaining.size(); 2618 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2619 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2620 PE = IF->chain_end(); PI != PE; ++PI) 2621 Chaining.push_back(*PI); 2622 else 2623 Chaining.push_back(VD); 2624 2625 assert(Chaining.size() >= 2); 2626 NamedDecl **NamedChain = 2627 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2628 for (unsigned i = 0; i < Chaining.size(); i++) 2629 NamedChain[i] = Chaining[i]; 2630 2631 IndirectFieldDecl* IndirectField = 2632 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2633 VD->getIdentifier(), VD->getType(), 2634 NamedChain, Chaining.size()); 2635 2636 IndirectField->setAccess(AS); 2637 IndirectField->setImplicit(); 2638 SemaRef.PushOnScopeChains(IndirectField, S); 2639 2640 // That includes picking up the appropriate access specifier. 2641 if (AS != AS_none) IndirectField->setAccess(AS); 2642 2643 Chaining.resize(OldChainingSize); 2644 } 2645 } 2646 } 2647 2648 return Invalid; 2649} 2650 2651/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2652/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2653/// illegal input values are mapped to SC_None. 2654static StorageClass 2655StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2656 switch (StorageClassSpec) { 2657 case DeclSpec::SCS_unspecified: return SC_None; 2658 case DeclSpec::SCS_extern: return SC_Extern; 2659 case DeclSpec::SCS_static: return SC_Static; 2660 case DeclSpec::SCS_auto: return SC_Auto; 2661 case DeclSpec::SCS_register: return SC_Register; 2662 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2663 // Illegal SCSs map to None: error reporting is up to the caller. 2664 case DeclSpec::SCS_mutable: // Fall through. 2665 case DeclSpec::SCS_typedef: return SC_None; 2666 } 2667 llvm_unreachable("unknown storage class specifier"); 2668} 2669 2670/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2671/// a StorageClass. Any error reporting is up to the caller: 2672/// illegal input values are mapped to SC_None. 2673static StorageClass 2674StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2675 switch (StorageClassSpec) { 2676 case DeclSpec::SCS_unspecified: return SC_None; 2677 case DeclSpec::SCS_extern: return SC_Extern; 2678 case DeclSpec::SCS_static: return SC_Static; 2679 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2680 // Illegal SCSs map to None: error reporting is up to the caller. 2681 case DeclSpec::SCS_auto: // Fall through. 2682 case DeclSpec::SCS_mutable: // Fall through. 2683 case DeclSpec::SCS_register: // Fall through. 2684 case DeclSpec::SCS_typedef: return SC_None; 2685 } 2686 llvm_unreachable("unknown storage class specifier"); 2687} 2688 2689/// BuildAnonymousStructOrUnion - Handle the declaration of an 2690/// anonymous structure or union. Anonymous unions are a C++ feature 2691/// (C++ [class.union]) and a C11 feature; anonymous structures 2692/// are a C11 feature and GNU C++ extension. 2693Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2694 AccessSpecifier AS, 2695 RecordDecl *Record) { 2696 DeclContext *Owner = Record->getDeclContext(); 2697 2698 // Diagnose whether this anonymous struct/union is an extension. 2699 if (Record->isUnion() && !getLangOptions().CPlusPlus && !getLangOptions().C11) 2700 Diag(Record->getLocation(), diag::ext_anonymous_union); 2701 else if (!Record->isUnion() && getLangOptions().CPlusPlus) 2702 Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct); 2703 else if (!Record->isUnion() && !getLangOptions().C11) 2704 Diag(Record->getLocation(), diag::ext_c11_anonymous_struct); 2705 2706 // C and C++ require different kinds of checks for anonymous 2707 // structs/unions. 2708 bool Invalid = false; 2709 if (getLangOptions().CPlusPlus) { 2710 const char* PrevSpec = 0; 2711 unsigned DiagID; 2712 if (Record->isUnion()) { 2713 // C++ [class.union]p6: 2714 // Anonymous unions declared in a named namespace or in the 2715 // global namespace shall be declared static. 2716 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2717 (isa<TranslationUnitDecl>(Owner) || 2718 (isa<NamespaceDecl>(Owner) && 2719 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2720 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2721 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2722 2723 // Recover by adding 'static'. 2724 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2725 PrevSpec, DiagID); 2726 } 2727 // C++ [class.union]p6: 2728 // A storage class is not allowed in a declaration of an 2729 // anonymous union in a class scope. 2730 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2731 isa<RecordDecl>(Owner)) { 2732 Diag(DS.getStorageClassSpecLoc(), 2733 diag::err_anonymous_union_with_storage_spec) 2734 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2735 2736 // Recover by removing the storage specifier. 2737 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2738 SourceLocation(), 2739 PrevSpec, DiagID); 2740 } 2741 } 2742 2743 // Ignore const/volatile/restrict qualifiers. 2744 if (DS.getTypeQualifiers()) { 2745 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2746 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2747 << Record->isUnion() << 0 2748 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2749 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2750 Diag(DS.getVolatileSpecLoc(), 2751 diag::ext_anonymous_struct_union_qualified) 2752 << Record->isUnion() << 1 2753 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2754 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2755 Diag(DS.getRestrictSpecLoc(), 2756 diag::ext_anonymous_struct_union_qualified) 2757 << Record->isUnion() << 2 2758 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2759 2760 DS.ClearTypeQualifiers(); 2761 } 2762 2763 // C++ [class.union]p2: 2764 // The member-specification of an anonymous union shall only 2765 // define non-static data members. [Note: nested types and 2766 // functions cannot be declared within an anonymous union. ] 2767 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2768 MemEnd = Record->decls_end(); 2769 Mem != MemEnd; ++Mem) { 2770 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2771 // C++ [class.union]p3: 2772 // An anonymous union shall not have private or protected 2773 // members (clause 11). 2774 assert(FD->getAccess() != AS_none); 2775 if (FD->getAccess() != AS_public) { 2776 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2777 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2778 Invalid = true; 2779 } 2780 2781 // C++ [class.union]p1 2782 // An object of a class with a non-trivial constructor, a non-trivial 2783 // copy constructor, a non-trivial destructor, or a non-trivial copy 2784 // assignment operator cannot be a member of a union, nor can an 2785 // array of such objects. 2786 if (CheckNontrivialField(FD)) 2787 Invalid = true; 2788 } else if ((*Mem)->isImplicit()) { 2789 // Any implicit members are fine. 2790 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2791 // This is a type that showed up in an 2792 // elaborated-type-specifier inside the anonymous struct or 2793 // union, but which actually declares a type outside of the 2794 // anonymous struct or union. It's okay. 2795 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2796 if (!MemRecord->isAnonymousStructOrUnion() && 2797 MemRecord->getDeclName()) { 2798 // Visual C++ allows type definition in anonymous struct or union. 2799 if (getLangOptions().MicrosoftExt) 2800 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2801 << (int)Record->isUnion(); 2802 else { 2803 // This is a nested type declaration. 2804 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2805 << (int)Record->isUnion(); 2806 Invalid = true; 2807 } 2808 } 2809 } else if (isa<AccessSpecDecl>(*Mem)) { 2810 // Any access specifier is fine. 2811 } else { 2812 // We have something that isn't a non-static data 2813 // member. Complain about it. 2814 unsigned DK = diag::err_anonymous_record_bad_member; 2815 if (isa<TypeDecl>(*Mem)) 2816 DK = diag::err_anonymous_record_with_type; 2817 else if (isa<FunctionDecl>(*Mem)) 2818 DK = diag::err_anonymous_record_with_function; 2819 else if (isa<VarDecl>(*Mem)) 2820 DK = diag::err_anonymous_record_with_static; 2821 2822 // Visual C++ allows type definition in anonymous struct or union. 2823 if (getLangOptions().MicrosoftExt && 2824 DK == diag::err_anonymous_record_with_type) 2825 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2826 << (int)Record->isUnion(); 2827 else { 2828 Diag((*Mem)->getLocation(), DK) 2829 << (int)Record->isUnion(); 2830 Invalid = true; 2831 } 2832 } 2833 } 2834 } 2835 2836 if (!Record->isUnion() && !Owner->isRecord()) { 2837 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2838 << (int)getLangOptions().CPlusPlus; 2839 Invalid = true; 2840 } 2841 2842 // Mock up a declarator. 2843 Declarator Dc(DS, Declarator::MemberContext); 2844 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2845 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2846 2847 // Create a declaration for this anonymous struct/union. 2848 NamedDecl *Anon = 0; 2849 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2850 Anon = FieldDecl::Create(Context, OwningClass, 2851 DS.getLocStart(), 2852 Record->getLocation(), 2853 /*IdentifierInfo=*/0, 2854 Context.getTypeDeclType(Record), 2855 TInfo, 2856 /*BitWidth=*/0, /*Mutable=*/false, 2857 /*HasInit=*/false); 2858 Anon->setAccess(AS); 2859 if (getLangOptions().CPlusPlus) 2860 FieldCollector->Add(cast<FieldDecl>(Anon)); 2861 } else { 2862 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2863 assert(SCSpec != DeclSpec::SCS_typedef && 2864 "Parser allowed 'typedef' as storage class VarDecl."); 2865 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2866 if (SCSpec == DeclSpec::SCS_mutable) { 2867 // mutable can only appear on non-static class members, so it's always 2868 // an error here 2869 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2870 Invalid = true; 2871 SC = SC_None; 2872 } 2873 SCSpec = DS.getStorageClassSpecAsWritten(); 2874 VarDecl::StorageClass SCAsWritten 2875 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2876 2877 Anon = VarDecl::Create(Context, Owner, 2878 DS.getLocStart(), 2879 Record->getLocation(), /*IdentifierInfo=*/0, 2880 Context.getTypeDeclType(Record), 2881 TInfo, SC, SCAsWritten); 2882 2883 // Default-initialize the implicit variable. This initialization will be 2884 // trivial in almost all cases, except if a union member has an in-class 2885 // initializer: 2886 // union { int n = 0; }; 2887 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2888 } 2889 Anon->setImplicit(); 2890 2891 // Add the anonymous struct/union object to the current 2892 // context. We'll be referencing this object when we refer to one of 2893 // its members. 2894 Owner->addDecl(Anon); 2895 2896 // Inject the members of the anonymous struct/union into the owning 2897 // context and into the identifier resolver chain for name lookup 2898 // purposes. 2899 SmallVector<NamedDecl*, 2> Chain; 2900 Chain.push_back(Anon); 2901 2902 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2903 Chain, false)) 2904 Invalid = true; 2905 2906 // Mark this as an anonymous struct/union type. Note that we do not 2907 // do this until after we have already checked and injected the 2908 // members of this anonymous struct/union type, because otherwise 2909 // the members could be injected twice: once by DeclContext when it 2910 // builds its lookup table, and once by 2911 // InjectAnonymousStructOrUnionMembers. 2912 Record->setAnonymousStructOrUnion(true); 2913 2914 if (Invalid) 2915 Anon->setInvalidDecl(); 2916 2917 return Anon; 2918} 2919 2920/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2921/// Microsoft C anonymous structure. 2922/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2923/// Example: 2924/// 2925/// struct A { int a; }; 2926/// struct B { struct A; int b; }; 2927/// 2928/// void foo() { 2929/// B var; 2930/// var.a = 3; 2931/// } 2932/// 2933Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2934 RecordDecl *Record) { 2935 2936 // If there is no Record, get the record via the typedef. 2937 if (!Record) 2938 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2939 2940 // Mock up a declarator. 2941 Declarator Dc(DS, Declarator::TypeNameContext); 2942 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2943 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2944 2945 // Create a declaration for this anonymous struct. 2946 NamedDecl* Anon = FieldDecl::Create(Context, 2947 cast<RecordDecl>(CurContext), 2948 DS.getLocStart(), 2949 DS.getLocStart(), 2950 /*IdentifierInfo=*/0, 2951 Context.getTypeDeclType(Record), 2952 TInfo, 2953 /*BitWidth=*/0, /*Mutable=*/false, 2954 /*HasInit=*/false); 2955 Anon->setImplicit(); 2956 2957 // Add the anonymous struct object to the current context. 2958 CurContext->addDecl(Anon); 2959 2960 // Inject the members of the anonymous struct into the current 2961 // context and into the identifier resolver chain for name lookup 2962 // purposes. 2963 SmallVector<NamedDecl*, 2> Chain; 2964 Chain.push_back(Anon); 2965 2966 RecordDecl *RecordDef = Record->getDefinition(); 2967 if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2968 RecordDef, AS_none, 2969 Chain, true)) 2970 Anon->setInvalidDecl(); 2971 2972 return Anon; 2973} 2974 2975/// GetNameForDeclarator - Determine the full declaration name for the 2976/// given Declarator. 2977DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2978 return GetNameFromUnqualifiedId(D.getName()); 2979} 2980 2981/// \brief Retrieves the declaration name from a parsed unqualified-id. 2982DeclarationNameInfo 2983Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2984 DeclarationNameInfo NameInfo; 2985 NameInfo.setLoc(Name.StartLocation); 2986 2987 switch (Name.getKind()) { 2988 2989 case UnqualifiedId::IK_ImplicitSelfParam: 2990 case UnqualifiedId::IK_Identifier: 2991 NameInfo.setName(Name.Identifier); 2992 NameInfo.setLoc(Name.StartLocation); 2993 return NameInfo; 2994 2995 case UnqualifiedId::IK_OperatorFunctionId: 2996 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2997 Name.OperatorFunctionId.Operator)); 2998 NameInfo.setLoc(Name.StartLocation); 2999 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 3000 = Name.OperatorFunctionId.SymbolLocations[0]; 3001 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 3002 = Name.EndLocation.getRawEncoding(); 3003 return NameInfo; 3004 3005 case UnqualifiedId::IK_LiteralOperatorId: 3006 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 3007 Name.Identifier)); 3008 NameInfo.setLoc(Name.StartLocation); 3009 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 3010 return NameInfo; 3011 3012 case UnqualifiedId::IK_ConversionFunctionId: { 3013 TypeSourceInfo *TInfo; 3014 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 3015 if (Ty.isNull()) 3016 return DeclarationNameInfo(); 3017 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 3018 Context.getCanonicalType(Ty))); 3019 NameInfo.setLoc(Name.StartLocation); 3020 NameInfo.setNamedTypeInfo(TInfo); 3021 return NameInfo; 3022 } 3023 3024 case UnqualifiedId::IK_ConstructorName: { 3025 TypeSourceInfo *TInfo; 3026 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 3027 if (Ty.isNull()) 3028 return DeclarationNameInfo(); 3029 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3030 Context.getCanonicalType(Ty))); 3031 NameInfo.setLoc(Name.StartLocation); 3032 NameInfo.setNamedTypeInfo(TInfo); 3033 return NameInfo; 3034 } 3035 3036 case UnqualifiedId::IK_ConstructorTemplateId: { 3037 // In well-formed code, we can only have a constructor 3038 // template-id that refers to the current context, so go there 3039 // to find the actual type being constructed. 3040 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 3041 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 3042 return DeclarationNameInfo(); 3043 3044 // Determine the type of the class being constructed. 3045 QualType CurClassType = Context.getTypeDeclType(CurClass); 3046 3047 // FIXME: Check two things: that the template-id names the same type as 3048 // CurClassType, and that the template-id does not occur when the name 3049 // was qualified. 3050 3051 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3052 Context.getCanonicalType(CurClassType))); 3053 NameInfo.setLoc(Name.StartLocation); 3054 // FIXME: should we retrieve TypeSourceInfo? 3055 NameInfo.setNamedTypeInfo(0); 3056 return NameInfo; 3057 } 3058 3059 case UnqualifiedId::IK_DestructorName: { 3060 TypeSourceInfo *TInfo; 3061 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3062 if (Ty.isNull()) 3063 return DeclarationNameInfo(); 3064 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3065 Context.getCanonicalType(Ty))); 3066 NameInfo.setLoc(Name.StartLocation); 3067 NameInfo.setNamedTypeInfo(TInfo); 3068 return NameInfo; 3069 } 3070 3071 case UnqualifiedId::IK_TemplateId: { 3072 TemplateName TName = Name.TemplateId->Template.get(); 3073 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3074 return Context.getNameForTemplate(TName, TNameLoc); 3075 } 3076 3077 } // switch (Name.getKind()) 3078 3079 llvm_unreachable("Unknown name kind"); 3080} 3081 3082static QualType getCoreType(QualType Ty) { 3083 do { 3084 if (Ty->isPointerType() || Ty->isReferenceType()) 3085 Ty = Ty->getPointeeType(); 3086 else if (Ty->isArrayType()) 3087 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3088 else 3089 return Ty.withoutLocalFastQualifiers(); 3090 } while (true); 3091} 3092 3093/// hasSimilarParameters - Determine whether the C++ functions Declaration 3094/// and Definition have "nearly" matching parameters. This heuristic is 3095/// used to improve diagnostics in the case where an out-of-line function 3096/// definition doesn't match any declaration within the class or namespace. 3097/// Also sets Params to the list of indices to the parameters that differ 3098/// between the declaration and the definition. If hasSimilarParameters 3099/// returns true and Params is empty, then all of the parameters match. 3100static bool hasSimilarParameters(ASTContext &Context, 3101 FunctionDecl *Declaration, 3102 FunctionDecl *Definition, 3103 llvm::SmallVectorImpl<unsigned> &Params) { 3104 Params.clear(); 3105 if (Declaration->param_size() != Definition->param_size()) 3106 return false; 3107 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3108 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3109 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3110 3111 // The parameter types are identical 3112 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3113 continue; 3114 3115 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3116 QualType DefParamBaseTy = getCoreType(DefParamTy); 3117 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3118 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3119 3120 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3121 (DeclTyName && DeclTyName == DefTyName)) 3122 Params.push_back(Idx); 3123 else // The two parameters aren't even close 3124 return false; 3125 } 3126 3127 return true; 3128} 3129 3130/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3131/// declarator needs to be rebuilt in the current instantiation. 3132/// Any bits of declarator which appear before the name are valid for 3133/// consideration here. That's specifically the type in the decl spec 3134/// and the base type in any member-pointer chunks. 3135static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3136 DeclarationName Name) { 3137 // The types we specifically need to rebuild are: 3138 // - typenames, typeofs, and decltypes 3139 // - types which will become injected class names 3140 // Of course, we also need to rebuild any type referencing such a 3141 // type. It's safest to just say "dependent", but we call out a 3142 // few cases here. 3143 3144 DeclSpec &DS = D.getMutableDeclSpec(); 3145 switch (DS.getTypeSpecType()) { 3146 case DeclSpec::TST_typename: 3147 case DeclSpec::TST_typeofType: 3148 case DeclSpec::TST_decltype: 3149 case DeclSpec::TST_underlyingType: 3150 case DeclSpec::TST_atomic: { 3151 // Grab the type from the parser. 3152 TypeSourceInfo *TSI = 0; 3153 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3154 if (T.isNull() || !T->isDependentType()) break; 3155 3156 // Make sure there's a type source info. This isn't really much 3157 // of a waste; most dependent types should have type source info 3158 // attached already. 3159 if (!TSI) 3160 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3161 3162 // Rebuild the type in the current instantiation. 3163 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3164 if (!TSI) return true; 3165 3166 // Store the new type back in the decl spec. 3167 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3168 DS.UpdateTypeRep(LocType); 3169 break; 3170 } 3171 3172 case DeclSpec::TST_typeofExpr: { 3173 Expr *E = DS.getRepAsExpr(); 3174 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3175 if (Result.isInvalid()) return true; 3176 DS.UpdateExprRep(Result.get()); 3177 break; 3178 } 3179 3180 default: 3181 // Nothing to do for these decl specs. 3182 break; 3183 } 3184 3185 // It doesn't matter what order we do this in. 3186 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3187 DeclaratorChunk &Chunk = D.getTypeObject(I); 3188 3189 // The only type information in the declarator which can come 3190 // before the declaration name is the base type of a member 3191 // pointer. 3192 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3193 continue; 3194 3195 // Rebuild the scope specifier in-place. 3196 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3197 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3198 return true; 3199 } 3200 3201 return false; 3202} 3203 3204Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3205 D.setFunctionDefinitionKind(FDK_Declaration); 3206 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3207 3208 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3209 Dcl->getDeclContext()->isFileContext()) 3210 Dcl->setTopLevelDeclInObjCContainer(); 3211 3212 return Dcl; 3213} 3214 3215/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3216/// If T is the name of a class, then each of the following shall have a 3217/// name different from T: 3218/// - every static data member of class T; 3219/// - every member function of class T 3220/// - every member of class T that is itself a type; 3221/// \returns true if the declaration name violates these rules. 3222bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3223 DeclarationNameInfo NameInfo) { 3224 DeclarationName Name = NameInfo.getName(); 3225 3226 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3227 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3228 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3229 return true; 3230 } 3231 3232 return false; 3233} 3234 3235Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3236 MultiTemplateParamsArg TemplateParamLists) { 3237 // TODO: consider using NameInfo for diagnostic. 3238 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3239 DeclarationName Name = NameInfo.getName(); 3240 3241 // All of these full declarators require an identifier. If it doesn't have 3242 // one, the ParsedFreeStandingDeclSpec action should be used. 3243 if (!Name) { 3244 if (!D.isInvalidType()) // Reject this if we think it is valid. 3245 Diag(D.getDeclSpec().getLocStart(), 3246 diag::err_declarator_need_ident) 3247 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3248 return 0; 3249 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3250 return 0; 3251 3252 // The scope passed in may not be a decl scope. Zip up the scope tree until 3253 // we find one that is. 3254 while ((S->getFlags() & Scope::DeclScope) == 0 || 3255 (S->getFlags() & Scope::TemplateParamScope) != 0) 3256 S = S->getParent(); 3257 3258 DeclContext *DC = CurContext; 3259 if (D.getCXXScopeSpec().isInvalid()) 3260 D.setInvalidType(); 3261 else if (D.getCXXScopeSpec().isSet()) { 3262 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3263 UPPC_DeclarationQualifier)) 3264 return 0; 3265 3266 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3267 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3268 if (!DC) { 3269 // If we could not compute the declaration context, it's because the 3270 // declaration context is dependent but does not refer to a class, 3271 // class template, or class template partial specialization. Complain 3272 // and return early, to avoid the coming semantic disaster. 3273 Diag(D.getIdentifierLoc(), 3274 diag::err_template_qualified_declarator_no_match) 3275 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3276 << D.getCXXScopeSpec().getRange(); 3277 return 0; 3278 } 3279 bool IsDependentContext = DC->isDependentContext(); 3280 3281 if (!IsDependentContext && 3282 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3283 return 0; 3284 3285 if (isa<CXXRecordDecl>(DC)) { 3286 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3287 Diag(D.getIdentifierLoc(), 3288 diag::err_member_def_undefined_record) 3289 << Name << DC << D.getCXXScopeSpec().getRange(); 3290 D.setInvalidType(); 3291 } else if (isa<CXXRecordDecl>(CurContext) && 3292 !D.getDeclSpec().isFriendSpecified()) { 3293 // The user provided a superfluous scope specifier inside a class 3294 // definition: 3295 // 3296 // class X { 3297 // void X::f(); 3298 // }; 3299 if (CurContext->Equals(DC)) { 3300 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3301 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3302 } else { 3303 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3304 << Name << D.getCXXScopeSpec().getRange(); 3305 3306 // C++ constructors and destructors with incorrect scopes can break 3307 // our AST invariants by having the wrong underlying types. If 3308 // that's the case, then drop this declaration entirely. 3309 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3310 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3311 !Context.hasSameType(Name.getCXXNameType(), 3312 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)))) 3313 return 0; 3314 } 3315 3316 // Pretend that this qualifier was not here. 3317 D.getCXXScopeSpec().clear(); 3318 } 3319 } 3320 3321 // Check whether we need to rebuild the type of the given 3322 // declaration in the current instantiation. 3323 if (EnteringContext && IsDependentContext && 3324 TemplateParamLists.size() != 0) { 3325 ContextRAII SavedContext(*this, DC); 3326 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3327 D.setInvalidType(); 3328 } 3329 } 3330 3331 if (DiagnoseClassNameShadow(DC, NameInfo)) 3332 // If this is a typedef, we'll end up spewing multiple diagnostics. 3333 // Just return early; it's safer. 3334 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3335 return 0; 3336 3337 NamedDecl *New; 3338 3339 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3340 QualType R = TInfo->getType(); 3341 3342 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3343 UPPC_DeclarationType)) 3344 D.setInvalidType(); 3345 3346 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3347 ForRedeclaration); 3348 3349 // See if this is a redefinition of a variable in the same scope. 3350 if (!D.getCXXScopeSpec().isSet()) { 3351 bool IsLinkageLookup = false; 3352 3353 // If the declaration we're planning to build will be a function 3354 // or object with linkage, then look for another declaration with 3355 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3356 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3357 /* Do nothing*/; 3358 else if (R->isFunctionType()) { 3359 if (CurContext->isFunctionOrMethod() || 3360 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3361 IsLinkageLookup = true; 3362 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3363 IsLinkageLookup = true; 3364 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3365 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3366 IsLinkageLookup = true; 3367 3368 if (IsLinkageLookup) 3369 Previous.clear(LookupRedeclarationWithLinkage); 3370 3371 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3372 } else { // Something like "int foo::x;" 3373 LookupQualifiedName(Previous, DC); 3374 3375 // Don't consider using declarations as previous declarations for 3376 // out-of-line members. 3377 RemoveUsingDecls(Previous); 3378 3379 // C++ 7.3.1.2p2: 3380 // Members (including explicit specializations of templates) of a named 3381 // namespace can also be defined outside that namespace by explicit 3382 // qualification of the name being defined, provided that the entity being 3383 // defined was already declared in the namespace and the definition appears 3384 // after the point of declaration in a namespace that encloses the 3385 // declarations namespace. 3386 // 3387 // Note that we only check the context at this point. We don't yet 3388 // have enough information to make sure that PrevDecl is actually 3389 // the declaration we want to match. For example, given: 3390 // 3391 // class X { 3392 // void f(); 3393 // void f(float); 3394 // }; 3395 // 3396 // void X::f(int) { } // ill-formed 3397 // 3398 // In this case, PrevDecl will point to the overload set 3399 // containing the two f's declared in X, but neither of them 3400 // matches. 3401 3402 // First check whether we named the global scope. 3403 if (isa<TranslationUnitDecl>(DC)) { 3404 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3405 << Name << D.getCXXScopeSpec().getRange(); 3406 } else { 3407 DeclContext *Cur = CurContext; 3408 while (isa<LinkageSpecDecl>(Cur)) 3409 Cur = Cur->getParent(); 3410 if (!Cur->Encloses(DC)) { 3411 // The qualifying scope doesn't enclose the original declaration. 3412 // Emit diagnostic based on current scope. 3413 SourceLocation L = D.getIdentifierLoc(); 3414 SourceRange R = D.getCXXScopeSpec().getRange(); 3415 if (isa<FunctionDecl>(Cur)) 3416 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3417 else 3418 Diag(L, diag::err_invalid_declarator_scope) 3419 << Name << cast<NamedDecl>(DC) << R; 3420 D.setInvalidType(); 3421 } 3422 3423 // C++11 8.3p1: 3424 // ... "The nested-name-specifier of the qualified declarator-id shall 3425 // not begin with a decltype-specifer" 3426 NestedNameSpecifierLoc SpecLoc = 3427 D.getCXXScopeSpec().getWithLocInContext(Context); 3428 assert(SpecLoc && "A non-empty CXXScopeSpec should have a non-empty " 3429 "NestedNameSpecifierLoc"); 3430 while (SpecLoc.getPrefix()) 3431 SpecLoc = SpecLoc.getPrefix(); 3432 if (dyn_cast_or_null<DecltypeType>( 3433 SpecLoc.getNestedNameSpecifier()->getAsType())) 3434 Diag(SpecLoc.getBeginLoc(), diag::err_decltype_in_declarator) 3435 << SpecLoc.getTypeLoc().getSourceRange(); 3436 } 3437 } 3438 3439 if (Previous.isSingleResult() && 3440 Previous.getFoundDecl()->isTemplateParameter()) { 3441 // Maybe we will complain about the shadowed template parameter. 3442 if (!D.isInvalidType()) 3443 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3444 Previous.getFoundDecl()); 3445 3446 // Just pretend that we didn't see the previous declaration. 3447 Previous.clear(); 3448 } 3449 3450 // In C++, the previous declaration we find might be a tag type 3451 // (class or enum). In this case, the new declaration will hide the 3452 // tag type. Note that this does does not apply if we're declaring a 3453 // typedef (C++ [dcl.typedef]p4). 3454 if (Previous.isSingleTagDecl() && 3455 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3456 Previous.clear(); 3457 3458 bool AddToScope = true; 3459 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3460 if (TemplateParamLists.size()) { 3461 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3462 return 0; 3463 } 3464 3465 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3466 } else if (R->isFunctionType()) { 3467 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3468 move(TemplateParamLists), 3469 AddToScope); 3470 } else { 3471 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3472 move(TemplateParamLists)); 3473 } 3474 3475 if (New == 0) 3476 return 0; 3477 3478 // If this has an identifier and is not an invalid redeclaration or 3479 // function template specialization, add it to the scope stack. 3480 if (New->getDeclName() && AddToScope && 3481 !(D.isRedeclaration() && New->isInvalidDecl())) 3482 PushOnScopeChains(New, S); 3483 3484 return New; 3485} 3486 3487/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3488/// types into constant array types in certain situations which would otherwise 3489/// be errors (for GCC compatibility). 3490static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3491 ASTContext &Context, 3492 bool &SizeIsNegative, 3493 llvm::APSInt &Oversized) { 3494 // This method tries to turn a variable array into a constant 3495 // array even when the size isn't an ICE. This is necessary 3496 // for compatibility with code that depends on gcc's buggy 3497 // constant expression folding, like struct {char x[(int)(char*)2];} 3498 SizeIsNegative = false; 3499 Oversized = 0; 3500 3501 if (T->isDependentType()) 3502 return QualType(); 3503 3504 QualifierCollector Qs; 3505 const Type *Ty = Qs.strip(T); 3506 3507 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3508 QualType Pointee = PTy->getPointeeType(); 3509 QualType FixedType = 3510 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3511 Oversized); 3512 if (FixedType.isNull()) return FixedType; 3513 FixedType = Context.getPointerType(FixedType); 3514 return Qs.apply(Context, FixedType); 3515 } 3516 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3517 QualType Inner = PTy->getInnerType(); 3518 QualType FixedType = 3519 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3520 Oversized); 3521 if (FixedType.isNull()) return FixedType; 3522 FixedType = Context.getParenType(FixedType); 3523 return Qs.apply(Context, FixedType); 3524 } 3525 3526 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3527 if (!VLATy) 3528 return QualType(); 3529 // FIXME: We should probably handle this case 3530 if (VLATy->getElementType()->isVariablyModifiedType()) 3531 return QualType(); 3532 3533 llvm::APSInt Res; 3534 if (!VLATy->getSizeExpr() || 3535 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3536 return QualType(); 3537 3538 // Check whether the array size is negative. 3539 if (Res.isSigned() && Res.isNegative()) { 3540 SizeIsNegative = true; 3541 return QualType(); 3542 } 3543 3544 // Check whether the array is too large to be addressed. 3545 unsigned ActiveSizeBits 3546 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3547 Res); 3548 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3549 Oversized = Res; 3550 return QualType(); 3551 } 3552 3553 return Context.getConstantArrayType(VLATy->getElementType(), 3554 Res, ArrayType::Normal, 0); 3555} 3556 3557/// \brief Register the given locally-scoped external C declaration so 3558/// that it can be found later for redeclarations 3559void 3560Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3561 const LookupResult &Previous, 3562 Scope *S) { 3563 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3564 "Decl is not a locally-scoped decl!"); 3565 // Note that we have a locally-scoped external with this name. 3566 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3567 3568 if (!Previous.isSingleResult()) 3569 return; 3570 3571 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3572 3573 // If there was a previous declaration of this variable, it may be 3574 // in our identifier chain. Update the identifier chain with the new 3575 // declaration. 3576 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3577 // The previous declaration was found on the identifer resolver 3578 // chain, so remove it from its scope. 3579 3580 if (S->isDeclScope(PrevDecl)) { 3581 // Special case for redeclarations in the SAME scope. 3582 // Because this declaration is going to be added to the identifier chain 3583 // later, we should temporarily take it OFF the chain. 3584 IdResolver.RemoveDecl(ND); 3585 3586 } else { 3587 // Find the scope for the original declaration. 3588 while (S && !S->isDeclScope(PrevDecl)) 3589 S = S->getParent(); 3590 } 3591 3592 if (S) 3593 S->RemoveDecl(PrevDecl); 3594 } 3595} 3596 3597llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3598Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3599 if (ExternalSource) { 3600 // Load locally-scoped external decls from the external source. 3601 SmallVector<NamedDecl *, 4> Decls; 3602 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3603 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3604 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3605 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3606 if (Pos == LocallyScopedExternalDecls.end()) 3607 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3608 } 3609 } 3610 3611 return LocallyScopedExternalDecls.find(Name); 3612} 3613 3614/// \brief Diagnose function specifiers on a declaration of an identifier that 3615/// does not identify a function. 3616void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3617 // FIXME: We should probably indicate the identifier in question to avoid 3618 // confusion for constructs like "inline int a(), b;" 3619 if (D.getDeclSpec().isInlineSpecified()) 3620 Diag(D.getDeclSpec().getInlineSpecLoc(), 3621 diag::err_inline_non_function); 3622 3623 if (D.getDeclSpec().isVirtualSpecified()) 3624 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3625 diag::err_virtual_non_function); 3626 3627 if (D.getDeclSpec().isExplicitSpecified()) 3628 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3629 diag::err_explicit_non_function); 3630} 3631 3632NamedDecl* 3633Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3634 TypeSourceInfo *TInfo, LookupResult &Previous) { 3635 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3636 if (D.getCXXScopeSpec().isSet()) { 3637 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3638 << D.getCXXScopeSpec().getRange(); 3639 D.setInvalidType(); 3640 // Pretend we didn't see the scope specifier. 3641 DC = CurContext; 3642 Previous.clear(); 3643 } 3644 3645 if (getLangOptions().CPlusPlus) { 3646 // Check that there are no default arguments (C++ only). 3647 CheckExtraCXXDefaultArguments(D); 3648 } 3649 3650 DiagnoseFunctionSpecifiers(D); 3651 3652 if (D.getDeclSpec().isThreadSpecified()) 3653 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3654 if (D.getDeclSpec().isConstexprSpecified()) 3655 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3656 << 1; 3657 3658 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3659 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3660 << D.getName().getSourceRange(); 3661 return 0; 3662 } 3663 3664 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3665 if (!NewTD) return 0; 3666 3667 // Handle attributes prior to checking for duplicates in MergeVarDecl 3668 ProcessDeclAttributes(S, NewTD, D); 3669 3670 CheckTypedefForVariablyModifiedType(S, NewTD); 3671 3672 bool Redeclaration = D.isRedeclaration(); 3673 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3674 D.setRedeclaration(Redeclaration); 3675 return ND; 3676} 3677 3678void 3679Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3680 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3681 // then it shall have block scope. 3682 // Note that variably modified types must be fixed before merging the decl so 3683 // that redeclarations will match. 3684 QualType T = NewTD->getUnderlyingType(); 3685 if (T->isVariablyModifiedType()) { 3686 getCurFunction()->setHasBranchProtectedScope(); 3687 3688 if (S->getFnParent() == 0) { 3689 bool SizeIsNegative; 3690 llvm::APSInt Oversized; 3691 QualType FixedTy = 3692 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3693 Oversized); 3694 if (!FixedTy.isNull()) { 3695 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3696 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3697 } else { 3698 if (SizeIsNegative) 3699 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3700 else if (T->isVariableArrayType()) 3701 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3702 else if (Oversized.getBoolValue()) 3703 Diag(NewTD->getLocation(), diag::err_array_too_large) 3704 << Oversized.toString(10); 3705 else 3706 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3707 NewTD->setInvalidDecl(); 3708 } 3709 } 3710 } 3711} 3712 3713 3714/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3715/// declares a typedef-name, either using the 'typedef' type specifier or via 3716/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3717NamedDecl* 3718Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3719 LookupResult &Previous, bool &Redeclaration) { 3720 // Merge the decl with the existing one if appropriate. If the decl is 3721 // in an outer scope, it isn't the same thing. 3722 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3723 /*ExplicitInstantiationOrSpecialization=*/false); 3724 if (!Previous.empty()) { 3725 Redeclaration = true; 3726 MergeTypedefNameDecl(NewTD, Previous); 3727 } 3728 3729 // If this is the C FILE type, notify the AST context. 3730 if (IdentifierInfo *II = NewTD->getIdentifier()) 3731 if (!NewTD->isInvalidDecl() && 3732 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3733 if (II->isStr("FILE")) 3734 Context.setFILEDecl(NewTD); 3735 else if (II->isStr("jmp_buf")) 3736 Context.setjmp_bufDecl(NewTD); 3737 else if (II->isStr("sigjmp_buf")) 3738 Context.setsigjmp_bufDecl(NewTD); 3739 else if (II->isStr("ucontext_t")) 3740 Context.setucontext_tDecl(NewTD); 3741 else if (II->isStr("__builtin_va_list")) 3742 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3743 } 3744 3745 return NewTD; 3746} 3747 3748/// \brief Determines whether the given declaration is an out-of-scope 3749/// previous declaration. 3750/// 3751/// This routine should be invoked when name lookup has found a 3752/// previous declaration (PrevDecl) that is not in the scope where a 3753/// new declaration by the same name is being introduced. If the new 3754/// declaration occurs in a local scope, previous declarations with 3755/// linkage may still be considered previous declarations (C99 3756/// 6.2.2p4-5, C++ [basic.link]p6). 3757/// 3758/// \param PrevDecl the previous declaration found by name 3759/// lookup 3760/// 3761/// \param DC the context in which the new declaration is being 3762/// declared. 3763/// 3764/// \returns true if PrevDecl is an out-of-scope previous declaration 3765/// for a new delcaration with the same name. 3766static bool 3767isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3768 ASTContext &Context) { 3769 if (!PrevDecl) 3770 return false; 3771 3772 if (!PrevDecl->hasLinkage()) 3773 return false; 3774 3775 if (Context.getLangOptions().CPlusPlus) { 3776 // C++ [basic.link]p6: 3777 // If there is a visible declaration of an entity with linkage 3778 // having the same name and type, ignoring entities declared 3779 // outside the innermost enclosing namespace scope, the block 3780 // scope declaration declares that same entity and receives the 3781 // linkage of the previous declaration. 3782 DeclContext *OuterContext = DC->getRedeclContext(); 3783 if (!OuterContext->isFunctionOrMethod()) 3784 // This rule only applies to block-scope declarations. 3785 return false; 3786 3787 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3788 if (PrevOuterContext->isRecord()) 3789 // We found a member function: ignore it. 3790 return false; 3791 3792 // Find the innermost enclosing namespace for the new and 3793 // previous declarations. 3794 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3795 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3796 3797 // The previous declaration is in a different namespace, so it 3798 // isn't the same function. 3799 if (!OuterContext->Equals(PrevOuterContext)) 3800 return false; 3801 } 3802 3803 return true; 3804} 3805 3806static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3807 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3808 if (!SS.isSet()) return; 3809 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3810} 3811 3812bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3813 QualType type = decl->getType(); 3814 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3815 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3816 // Various kinds of declaration aren't allowed to be __autoreleasing. 3817 unsigned kind = -1U; 3818 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3819 if (var->hasAttr<BlocksAttr>()) 3820 kind = 0; // __block 3821 else if (!var->hasLocalStorage()) 3822 kind = 1; // global 3823 } else if (isa<ObjCIvarDecl>(decl)) { 3824 kind = 3; // ivar 3825 } else if (isa<FieldDecl>(decl)) { 3826 kind = 2; // field 3827 } 3828 3829 if (kind != -1U) { 3830 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3831 << kind; 3832 } 3833 } else if (lifetime == Qualifiers::OCL_None) { 3834 // Try to infer lifetime. 3835 if (!type->isObjCLifetimeType()) 3836 return false; 3837 3838 lifetime = type->getObjCARCImplicitLifetime(); 3839 type = Context.getLifetimeQualifiedType(type, lifetime); 3840 decl->setType(type); 3841 } 3842 3843 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3844 // Thread-local variables cannot have lifetime. 3845 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3846 var->isThreadSpecified()) { 3847 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3848 << var->getType(); 3849 return true; 3850 } 3851 } 3852 3853 return false; 3854} 3855 3856NamedDecl* 3857Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3858 TypeSourceInfo *TInfo, LookupResult &Previous, 3859 MultiTemplateParamsArg TemplateParamLists) { 3860 QualType R = TInfo->getType(); 3861 DeclarationName Name = GetNameForDeclarator(D).getName(); 3862 3863 // Check that there are no default arguments (C++ only). 3864 if (getLangOptions().CPlusPlus) 3865 CheckExtraCXXDefaultArguments(D); 3866 3867 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3868 assert(SCSpec != DeclSpec::SCS_typedef && 3869 "Parser allowed 'typedef' as storage class VarDecl."); 3870 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3871 if (SCSpec == DeclSpec::SCS_mutable) { 3872 // mutable can only appear on non-static class members, so it's always 3873 // an error here 3874 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3875 D.setInvalidType(); 3876 SC = SC_None; 3877 } 3878 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3879 VarDecl::StorageClass SCAsWritten 3880 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3881 3882 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3883 if (!II) { 3884 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3885 << Name; 3886 return 0; 3887 } 3888 3889 DiagnoseFunctionSpecifiers(D); 3890 3891 if (!DC->isRecord() && S->getFnParent() == 0) { 3892 // C99 6.9p2: The storage-class specifiers auto and register shall not 3893 // appear in the declaration specifiers in an external declaration. 3894 if (SC == SC_Auto || SC == SC_Register) { 3895 3896 // If this is a register variable with an asm label specified, then this 3897 // is a GNU extension. 3898 if (SC == SC_Register && D.getAsmLabel()) 3899 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3900 else 3901 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3902 D.setInvalidType(); 3903 } 3904 } 3905 3906 if (getLangOptions().OpenCL) { 3907 // Set up the special work-group-local storage class for variables in the 3908 // OpenCL __local address space. 3909 if (R.getAddressSpace() == LangAS::opencl_local) 3910 SC = SC_OpenCLWorkGroupLocal; 3911 } 3912 3913 bool isExplicitSpecialization = false; 3914 VarDecl *NewVD; 3915 if (!getLangOptions().CPlusPlus) { 3916 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 3917 D.getIdentifierLoc(), II, 3918 R, TInfo, SC, SCAsWritten); 3919 3920 if (D.isInvalidType()) 3921 NewVD->setInvalidDecl(); 3922 } else { 3923 if (DC->isRecord() && !CurContext->isRecord()) { 3924 // This is an out-of-line definition of a static data member. 3925 if (SC == SC_Static) { 3926 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3927 diag::err_static_out_of_line) 3928 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3929 } else if (SC == SC_None) 3930 SC = SC_Static; 3931 } 3932 if (SC == SC_Static && CurContext->isRecord()) { 3933 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3934 if (RD->isLocalClass()) 3935 Diag(D.getIdentifierLoc(), 3936 diag::err_static_data_member_not_allowed_in_local_class) 3937 << Name << RD->getDeclName(); 3938 3939 // C++98 [class.union]p1: If a union contains a static data member, 3940 // the program is ill-formed. C++11 drops this restriction. 3941 if (RD->isUnion()) 3942 Diag(D.getIdentifierLoc(), 3943 getLangOptions().CPlusPlus0x 3944 ? diag::warn_cxx98_compat_static_data_member_in_union 3945 : diag::ext_static_data_member_in_union) << Name; 3946 // We conservatively disallow static data members in anonymous structs. 3947 else if (!RD->getDeclName()) 3948 Diag(D.getIdentifierLoc(), 3949 diag::err_static_data_member_not_allowed_in_anon_struct) 3950 << Name << RD->isUnion(); 3951 } 3952 } 3953 3954 // Match up the template parameter lists with the scope specifier, then 3955 // determine whether we have a template or a template specialization. 3956 isExplicitSpecialization = false; 3957 bool Invalid = false; 3958 if (TemplateParameterList *TemplateParams 3959 = MatchTemplateParametersToScopeSpecifier( 3960 D.getDeclSpec().getLocStart(), 3961 D.getIdentifierLoc(), 3962 D.getCXXScopeSpec(), 3963 TemplateParamLists.get(), 3964 TemplateParamLists.size(), 3965 /*never a friend*/ false, 3966 isExplicitSpecialization, 3967 Invalid)) { 3968 if (TemplateParams->size() > 0) { 3969 // There is no such thing as a variable template. 3970 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3971 << II 3972 << SourceRange(TemplateParams->getTemplateLoc(), 3973 TemplateParams->getRAngleLoc()); 3974 return 0; 3975 } else { 3976 // There is an extraneous 'template<>' for this variable. Complain 3977 // about it, but allow the declaration of the variable. 3978 Diag(TemplateParams->getTemplateLoc(), 3979 diag::err_template_variable_noparams) 3980 << II 3981 << SourceRange(TemplateParams->getTemplateLoc(), 3982 TemplateParams->getRAngleLoc()); 3983 } 3984 } 3985 3986 NewVD = VarDecl::Create(Context, DC, D.getLocStart(), 3987 D.getIdentifierLoc(), II, 3988 R, TInfo, SC, SCAsWritten); 3989 3990 // If this decl has an auto type in need of deduction, make a note of the 3991 // Decl so we can diagnose uses of it in its own initializer. 3992 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3993 R->getContainedAutoType()) 3994 ParsingInitForAutoVars.insert(NewVD); 3995 3996 if (D.isInvalidType() || Invalid) 3997 NewVD->setInvalidDecl(); 3998 3999 SetNestedNameSpecifier(NewVD, D); 4000 4001 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 4002 NewVD->setTemplateParameterListsInfo(Context, 4003 TemplateParamLists.size(), 4004 TemplateParamLists.release()); 4005 } 4006 4007 if (D.getDeclSpec().isConstexprSpecified()) 4008 NewVD->setConstexpr(true); 4009 } 4010 4011 // Set the lexical context. If the declarator has a C++ scope specifier, the 4012 // lexical context will be different from the semantic context. 4013 NewVD->setLexicalDeclContext(CurContext); 4014 4015 if (D.getDeclSpec().isThreadSpecified()) { 4016 if (NewVD->hasLocalStorage()) 4017 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 4018 else if (!Context.getTargetInfo().isTLSSupported()) 4019 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 4020 else 4021 NewVD->setThreadSpecified(true); 4022 } 4023 4024 if (D.getDeclSpec().isModulePrivateSpecified()) { 4025 if (isExplicitSpecialization) 4026 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 4027 << 2 4028 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4029 else if (NewVD->hasLocalStorage()) 4030 Diag(NewVD->getLocation(), diag::err_module_private_local) 4031 << 0 << NewVD->getDeclName() 4032 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 4033 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4034 else 4035 NewVD->setModulePrivate(); 4036 } 4037 4038 // Handle attributes prior to checking for duplicates in MergeVarDecl 4039 ProcessDeclAttributes(S, NewVD, D); 4040 4041 // In auto-retain/release, infer strong retension for variables of 4042 // retainable type. 4043 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4044 NewVD->setInvalidDecl(); 4045 4046 // Handle GNU asm-label extension (encoded as an attribute). 4047 if (Expr *E = (Expr*)D.getAsmLabel()) { 4048 // The parser guarantees this is a string. 4049 StringLiteral *SE = cast<StringLiteral>(E); 4050 StringRef Label = SE->getString(); 4051 if (S->getFnParent() != 0) { 4052 switch (SC) { 4053 case SC_None: 4054 case SC_Auto: 4055 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4056 break; 4057 case SC_Register: 4058 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4059 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4060 break; 4061 case SC_Static: 4062 case SC_Extern: 4063 case SC_PrivateExtern: 4064 case SC_OpenCLWorkGroupLocal: 4065 break; 4066 } 4067 } 4068 4069 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4070 Context, Label)); 4071 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 4072 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 4073 ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier()); 4074 if (I != ExtnameUndeclaredIdentifiers.end()) { 4075 NewVD->addAttr(I->second); 4076 ExtnameUndeclaredIdentifiers.erase(I); 4077 } 4078 } 4079 4080 // Diagnose shadowed variables before filtering for scope. 4081 if (!D.getCXXScopeSpec().isSet()) 4082 CheckShadow(S, NewVD, Previous); 4083 4084 // Don't consider existing declarations that are in a different 4085 // scope and are out-of-semantic-context declarations (if the new 4086 // declaration has linkage). 4087 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4088 isExplicitSpecialization); 4089 4090 if (!getLangOptions().CPlusPlus) { 4091 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4092 } else { 4093 // Merge the decl with the existing one if appropriate. 4094 if (!Previous.empty()) { 4095 if (Previous.isSingleResult() && 4096 isa<FieldDecl>(Previous.getFoundDecl()) && 4097 D.getCXXScopeSpec().isSet()) { 4098 // The user tried to define a non-static data member 4099 // out-of-line (C++ [dcl.meaning]p1). 4100 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4101 << D.getCXXScopeSpec().getRange(); 4102 Previous.clear(); 4103 NewVD->setInvalidDecl(); 4104 } 4105 } else if (D.getCXXScopeSpec().isSet()) { 4106 // No previous declaration in the qualifying scope. 4107 Diag(D.getIdentifierLoc(), diag::err_no_member) 4108 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4109 << D.getCXXScopeSpec().getRange(); 4110 NewVD->setInvalidDecl(); 4111 } 4112 4113 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4114 4115 // This is an explicit specialization of a static data member. Check it. 4116 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4117 CheckMemberSpecialization(NewVD, Previous)) 4118 NewVD->setInvalidDecl(); 4119 } 4120 4121 // attributes declared post-definition are currently ignored 4122 // FIXME: This should be handled in attribute merging, not 4123 // here. 4124 if (Previous.isSingleResult()) { 4125 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4126 if (Def && (Def = Def->getDefinition()) && 4127 Def != NewVD && D.hasAttributes()) { 4128 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4129 Diag(Def->getLocation(), diag::note_previous_definition); 4130 } 4131 } 4132 4133 // If this is a locally-scoped extern C variable, update the map of 4134 // such variables. 4135 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4136 !NewVD->isInvalidDecl()) 4137 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4138 4139 // If there's a #pragma GCC visibility in scope, and this isn't a class 4140 // member, set the visibility of this variable. 4141 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4142 AddPushedVisibilityAttribute(NewVD); 4143 4144 MarkUnusedFileScopedDecl(NewVD); 4145 4146 return NewVD; 4147} 4148 4149/// \brief Diagnose variable or built-in function shadowing. Implements 4150/// -Wshadow. 4151/// 4152/// This method is called whenever a VarDecl is added to a "useful" 4153/// scope. 4154/// 4155/// \param S the scope in which the shadowing name is being declared 4156/// \param R the lookup of the name 4157/// 4158void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4159 // Return if warning is ignored. 4160 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4161 DiagnosticsEngine::Ignored) 4162 return; 4163 4164 // Don't diagnose declarations at file scope. 4165 if (D->hasGlobalStorage()) 4166 return; 4167 4168 DeclContext *NewDC = D->getDeclContext(); 4169 4170 // Only diagnose if we're shadowing an unambiguous field or variable. 4171 if (R.getResultKind() != LookupResult::Found) 4172 return; 4173 4174 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4175 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4176 return; 4177 4178 // Fields are not shadowed by variables in C++ static methods. 4179 if (isa<FieldDecl>(ShadowedDecl)) 4180 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4181 if (MD->isStatic()) 4182 return; 4183 4184 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4185 if (shadowedVar->isExternC()) { 4186 // For shadowing external vars, make sure that we point to the global 4187 // declaration, not a locally scoped extern declaration. 4188 for (VarDecl::redecl_iterator 4189 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4190 I != E; ++I) 4191 if (I->isFileVarDecl()) { 4192 ShadowedDecl = *I; 4193 break; 4194 } 4195 } 4196 4197 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4198 4199 // Only warn about certain kinds of shadowing for class members. 4200 if (NewDC && NewDC->isRecord()) { 4201 // In particular, don't warn about shadowing non-class members. 4202 if (!OldDC->isRecord()) 4203 return; 4204 4205 // TODO: should we warn about static data members shadowing 4206 // static data members from base classes? 4207 4208 // TODO: don't diagnose for inaccessible shadowed members. 4209 // This is hard to do perfectly because we might friend the 4210 // shadowing context, but that's just a false negative. 4211 } 4212 4213 // Determine what kind of declaration we're shadowing. 4214 unsigned Kind; 4215 if (isa<RecordDecl>(OldDC)) { 4216 if (isa<FieldDecl>(ShadowedDecl)) 4217 Kind = 3; // field 4218 else 4219 Kind = 2; // static data member 4220 } else if (OldDC->isFileContext()) 4221 Kind = 1; // global 4222 else 4223 Kind = 0; // local 4224 4225 DeclarationName Name = R.getLookupName(); 4226 4227 // Emit warning and note. 4228 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4229 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4230} 4231 4232/// \brief Check -Wshadow without the advantage of a previous lookup. 4233void Sema::CheckShadow(Scope *S, VarDecl *D) { 4234 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4235 DiagnosticsEngine::Ignored) 4236 return; 4237 4238 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4239 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4240 LookupName(R, S); 4241 CheckShadow(S, D, R); 4242} 4243 4244/// \brief Perform semantic checking on a newly-created variable 4245/// declaration. 4246/// 4247/// This routine performs all of the type-checking required for a 4248/// variable declaration once it has been built. It is used both to 4249/// check variables after they have been parsed and their declarators 4250/// have been translated into a declaration, and to check variables 4251/// that have been instantiated from a template. 4252/// 4253/// Sets NewVD->isInvalidDecl() if an error was encountered. 4254/// 4255/// Returns true if the variable declaration is a redeclaration. 4256bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4257 LookupResult &Previous) { 4258 // If the decl is already known invalid, don't check it. 4259 if (NewVD->isInvalidDecl()) 4260 return false; 4261 4262 QualType T = NewVD->getType(); 4263 4264 if (T->isObjCObjectType()) { 4265 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4266 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4267 T = Context.getObjCObjectPointerType(T); 4268 NewVD->setType(T); 4269 } 4270 4271 // Emit an error if an address space was applied to decl with local storage. 4272 // This includes arrays of objects with address space qualifiers, but not 4273 // automatic variables that point to other address spaces. 4274 // ISO/IEC TR 18037 S5.1.2 4275 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4276 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4277 NewVD->setInvalidDecl(); 4278 return false; 4279 } 4280 4281 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4282 && !NewVD->hasAttr<BlocksAttr>()) { 4283 if (getLangOptions().getGC() != LangOptions::NonGC) 4284 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4285 else 4286 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4287 } 4288 4289 bool isVM = T->isVariablyModifiedType(); 4290 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4291 NewVD->hasAttr<BlocksAttr>()) 4292 getCurFunction()->setHasBranchProtectedScope(); 4293 4294 if ((isVM && NewVD->hasLinkage()) || 4295 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4296 bool SizeIsNegative; 4297 llvm::APSInt Oversized; 4298 QualType FixedTy = 4299 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4300 Oversized); 4301 4302 if (FixedTy.isNull() && T->isVariableArrayType()) { 4303 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4304 // FIXME: This won't give the correct result for 4305 // int a[10][n]; 4306 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4307 4308 if (NewVD->isFileVarDecl()) 4309 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4310 << SizeRange; 4311 else if (NewVD->getStorageClass() == SC_Static) 4312 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4313 << SizeRange; 4314 else 4315 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4316 << SizeRange; 4317 NewVD->setInvalidDecl(); 4318 return false; 4319 } 4320 4321 if (FixedTy.isNull()) { 4322 if (NewVD->isFileVarDecl()) 4323 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4324 else 4325 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4326 NewVD->setInvalidDecl(); 4327 return false; 4328 } 4329 4330 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4331 NewVD->setType(FixedTy); 4332 } 4333 4334 if (Previous.empty() && NewVD->isExternC()) { 4335 // Since we did not find anything by this name and we're declaring 4336 // an extern "C" variable, look for a non-visible extern "C" 4337 // declaration with the same name. 4338 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4339 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4340 if (Pos != LocallyScopedExternalDecls.end()) 4341 Previous.addDecl(Pos->second); 4342 } 4343 4344 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4345 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4346 << T; 4347 NewVD->setInvalidDecl(); 4348 return false; 4349 } 4350 4351 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4352 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4353 NewVD->setInvalidDecl(); 4354 return false; 4355 } 4356 4357 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4358 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4359 NewVD->setInvalidDecl(); 4360 return false; 4361 } 4362 4363 if (NewVD->isConstexpr() && !T->isDependentType() && 4364 RequireLiteralType(NewVD->getLocation(), T, 4365 PDiag(diag::err_constexpr_var_non_literal))) { 4366 NewVD->setInvalidDecl(); 4367 return false; 4368 } 4369 4370 if (!Previous.empty()) { 4371 MergeVarDecl(NewVD, Previous); 4372 return true; 4373 } 4374 return false; 4375} 4376 4377/// \brief Data used with FindOverriddenMethod 4378struct FindOverriddenMethodData { 4379 Sema *S; 4380 CXXMethodDecl *Method; 4381}; 4382 4383/// \brief Member lookup function that determines whether a given C++ 4384/// method overrides a method in a base class, to be used with 4385/// CXXRecordDecl::lookupInBases(). 4386static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4387 CXXBasePath &Path, 4388 void *UserData) { 4389 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4390 4391 FindOverriddenMethodData *Data 4392 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4393 4394 DeclarationName Name = Data->Method->getDeclName(); 4395 4396 // FIXME: Do we care about other names here too? 4397 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4398 // We really want to find the base class destructor here. 4399 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4400 CanQualType CT = Data->S->Context.getCanonicalType(T); 4401 4402 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4403 } 4404 4405 for (Path.Decls = BaseRecord->lookup(Name); 4406 Path.Decls.first != Path.Decls.second; 4407 ++Path.Decls.first) { 4408 NamedDecl *D = *Path.Decls.first; 4409 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4410 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4411 return true; 4412 } 4413 } 4414 4415 return false; 4416} 4417 4418/// AddOverriddenMethods - See if a method overrides any in the base classes, 4419/// and if so, check that it's a valid override and remember it. 4420bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4421 // Look for virtual methods in base classes that this method might override. 4422 CXXBasePaths Paths; 4423 FindOverriddenMethodData Data; 4424 Data.Method = MD; 4425 Data.S = this; 4426 bool AddedAny = false; 4427 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4428 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4429 E = Paths.found_decls_end(); I != E; ++I) { 4430 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4431 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4432 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4433 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4434 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4435 AddedAny = true; 4436 } 4437 } 4438 } 4439 } 4440 4441 return AddedAny; 4442} 4443 4444namespace { 4445 // Struct for holding all of the extra arguments needed by 4446 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4447 struct ActOnFDArgs { 4448 Scope *S; 4449 Declarator &D; 4450 MultiTemplateParamsArg TemplateParamLists; 4451 bool AddToScope; 4452 }; 4453} 4454 4455namespace { 4456 4457// Callback to only accept typo corrections that have a non-zero edit distance. 4458// Also only accept corrections that have the same parent decl. 4459class DifferentNameValidatorCCC : public CorrectionCandidateCallback { 4460 public: 4461 DifferentNameValidatorCCC(CXXRecordDecl *Parent) 4462 : ExpectedParent(Parent ? Parent->getCanonicalDecl() : 0) {} 4463 4464 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 4465 if (candidate.getEditDistance() == 0) 4466 return false; 4467 4468 if (CXXMethodDecl *MD = candidate.getCorrectionDeclAs<CXXMethodDecl>()) { 4469 CXXRecordDecl *Parent = MD->getParent(); 4470 return Parent && Parent->getCanonicalDecl() == ExpectedParent; 4471 } 4472 4473 return !ExpectedParent; 4474 } 4475 4476 private: 4477 CXXRecordDecl *ExpectedParent; 4478}; 4479 4480} 4481 4482/// \brief Generate diagnostics for an invalid function redeclaration. 4483/// 4484/// This routine handles generating the diagnostic messages for an invalid 4485/// function redeclaration, including finding possible similar declarations 4486/// or performing typo correction if there are no previous declarations with 4487/// the same name. 4488/// 4489/// Returns a NamedDecl iff typo correction was performed and substituting in 4490/// the new declaration name does not cause new errors. 4491static NamedDecl* DiagnoseInvalidRedeclaration( 4492 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4493 ActOnFDArgs &ExtraArgs) { 4494 NamedDecl *Result = NULL; 4495 DeclarationName Name = NewFD->getDeclName(); 4496 DeclContext *NewDC = NewFD->getDeclContext(); 4497 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4498 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4499 llvm::SmallVector<unsigned, 1> MismatchedParams; 4500 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4501 TypoCorrection Correction; 4502 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4503 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4504 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4505 : diag::err_member_def_does_not_match; 4506 4507 NewFD->setInvalidDecl(); 4508 SemaRef.LookupQualifiedName(Prev, NewDC); 4509 assert(!Prev.isAmbiguous() && 4510 "Cannot have an ambiguity in previous-declaration lookup"); 4511 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 4512 DifferentNameValidatorCCC Validator(MD ? MD->getParent() : 0); 4513 if (!Prev.empty()) { 4514 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4515 Func != FuncEnd; ++Func) { 4516 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4517 if (FD && 4518 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4519 // Add 1 to the index so that 0 can mean the mismatch didn't 4520 // involve a parameter 4521 unsigned ParamNum = 4522 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4523 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4524 } 4525 } 4526 // If the qualified name lookup yielded nothing, try typo correction 4527 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4528 Prev.getLookupKind(), 0, 0, 4529 Validator, NewDC))) { 4530 // Trap errors. 4531 Sema::SFINAETrap Trap(SemaRef); 4532 4533 // Set up everything for the call to ActOnFunctionDeclarator 4534 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4535 ExtraArgs.D.getIdentifierLoc()); 4536 Previous.clear(); 4537 Previous.setLookupName(Correction.getCorrection()); 4538 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4539 CDeclEnd = Correction.end(); 4540 CDecl != CDeclEnd; ++CDecl) { 4541 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4542 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4543 MismatchedParams)) { 4544 Previous.addDecl(FD); 4545 } 4546 } 4547 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4548 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4549 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4550 // eliminate the need for the parameter pack ExtraArgs. 4551 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4552 NewFD->getDeclContext(), 4553 NewFD->getTypeSourceInfo(), 4554 Previous, 4555 ExtraArgs.TemplateParamLists, 4556 ExtraArgs.AddToScope); 4557 if (Trap.hasErrorOccurred()) { 4558 // Pretend the typo correction never occurred 4559 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4560 ExtraArgs.D.getIdentifierLoc()); 4561 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4562 Previous.clear(); 4563 Previous.setLookupName(Name); 4564 Result = NULL; 4565 } else { 4566 for (LookupResult::iterator Func = Previous.begin(), 4567 FuncEnd = Previous.end(); 4568 Func != FuncEnd; ++Func) { 4569 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4570 NearMatches.push_back(std::make_pair(FD, 0)); 4571 } 4572 } 4573 if (NearMatches.empty()) { 4574 // Ignore the correction if it didn't yield any close FunctionDecl matches 4575 Correction = TypoCorrection(); 4576 } else { 4577 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4578 : diag::err_member_def_does_not_match_suggest; 4579 } 4580 } 4581 4582 if (Correction) 4583 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4584 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4585 << FixItHint::CreateReplacement( 4586 NewFD->getLocation(), 4587 Correction.getAsString(SemaRef.getLangOptions())); 4588 else 4589 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4590 << Name << NewDC << NewFD->getLocation(); 4591 4592 bool NewFDisConst = false; 4593 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4594 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4595 4596 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4597 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4598 NearMatch != NearMatchEnd; ++NearMatch) { 4599 FunctionDecl *FD = NearMatch->first; 4600 bool FDisConst = false; 4601 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4602 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4603 4604 if (unsigned Idx = NearMatch->second) { 4605 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4606 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4607 diag::note_member_def_close_param_match) 4608 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4609 } else if (Correction) { 4610 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4611 << Correction.getQuoted(SemaRef.getLangOptions()); 4612 } else if (FDisConst != NewFDisConst) { 4613 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4614 << NewFDisConst << FD->getSourceRange().getEnd(); 4615 } else 4616 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4617 } 4618 return Result; 4619} 4620 4621static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4622 Declarator &D) { 4623 switch (D.getDeclSpec().getStorageClassSpec()) { 4624 default: llvm_unreachable("Unknown storage class!"); 4625 case DeclSpec::SCS_auto: 4626 case DeclSpec::SCS_register: 4627 case DeclSpec::SCS_mutable: 4628 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4629 diag::err_typecheck_sclass_func); 4630 D.setInvalidType(); 4631 break; 4632 case DeclSpec::SCS_unspecified: break; 4633 case DeclSpec::SCS_extern: return SC_Extern; 4634 case DeclSpec::SCS_static: { 4635 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4636 // C99 6.7.1p5: 4637 // The declaration of an identifier for a function that has 4638 // block scope shall have no explicit storage-class specifier 4639 // other than extern 4640 // See also (C++ [dcl.stc]p4). 4641 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4642 diag::err_static_block_func); 4643 break; 4644 } else 4645 return SC_Static; 4646 } 4647 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4648 } 4649 4650 // No explicit storage class has already been returned 4651 return SC_None; 4652} 4653 4654static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4655 DeclContext *DC, QualType &R, 4656 TypeSourceInfo *TInfo, 4657 FunctionDecl::StorageClass SC, 4658 bool &IsVirtualOkay) { 4659 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4660 DeclarationName Name = NameInfo.getName(); 4661 4662 FunctionDecl *NewFD = 0; 4663 bool isInline = D.getDeclSpec().isInlineSpecified(); 4664 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4665 FunctionDecl::StorageClass SCAsWritten 4666 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4667 4668 if (!SemaRef.getLangOptions().CPlusPlus) { 4669 // Determine whether the function was written with a 4670 // prototype. This true when: 4671 // - there is a prototype in the declarator, or 4672 // - the type R of the function is some kind of typedef or other reference 4673 // to a type name (which eventually refers to a function type). 4674 bool HasPrototype = 4675 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4676 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4677 4678 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4679 D.getLocStart(), NameInfo, R, 4680 TInfo, SC, SCAsWritten, isInline, 4681 HasPrototype); 4682 if (D.isInvalidType()) 4683 NewFD->setInvalidDecl(); 4684 4685 // Set the lexical context. 4686 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4687 4688 return NewFD; 4689 } 4690 4691 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4692 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4693 4694 // Check that the return type is not an abstract class type. 4695 // For record types, this is done by the AbstractClassUsageDiagnoser once 4696 // the class has been completely parsed. 4697 if (!DC->isRecord() && 4698 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4699 R->getAs<FunctionType>()->getResultType(), 4700 diag::err_abstract_type_in_decl, 4701 SemaRef.AbstractReturnType)) 4702 D.setInvalidType(); 4703 4704 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4705 // This is a C++ constructor declaration. 4706 assert(DC->isRecord() && 4707 "Constructors can only be declared in a member context"); 4708 4709 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4710 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4711 D.getLocStart(), NameInfo, 4712 R, TInfo, isExplicit, isInline, 4713 /*isImplicitlyDeclared=*/false, 4714 isConstexpr); 4715 4716 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4717 // This is a C++ destructor declaration. 4718 if (DC->isRecord()) { 4719 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4720 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4721 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4722 SemaRef.Context, Record, 4723 D.getLocStart(), 4724 NameInfo, R, TInfo, isInline, 4725 /*isImplicitlyDeclared=*/false); 4726 4727 // If the class is complete, then we now create the implicit exception 4728 // specification. If the class is incomplete or dependent, we can't do 4729 // it yet. 4730 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4731 Record->getDefinition() && !Record->isBeingDefined() && 4732 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4733 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4734 } 4735 4736 IsVirtualOkay = true; 4737 return NewDD; 4738 4739 } else { 4740 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4741 D.setInvalidType(); 4742 4743 // Create a FunctionDecl to satisfy the function definition parsing 4744 // code path. 4745 return FunctionDecl::Create(SemaRef.Context, DC, 4746 D.getLocStart(), 4747 D.getIdentifierLoc(), Name, R, TInfo, 4748 SC, SCAsWritten, isInline, 4749 /*hasPrototype=*/true, isConstexpr); 4750 } 4751 4752 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4753 if (!DC->isRecord()) { 4754 SemaRef.Diag(D.getIdentifierLoc(), 4755 diag::err_conv_function_not_member); 4756 return 0; 4757 } 4758 4759 SemaRef.CheckConversionDeclarator(D, R, SC); 4760 IsVirtualOkay = true; 4761 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4762 D.getLocStart(), NameInfo, 4763 R, TInfo, isInline, isExplicit, 4764 isConstexpr, SourceLocation()); 4765 4766 } else if (DC->isRecord()) { 4767 // If the name of the function is the same as the name of the record, 4768 // then this must be an invalid constructor that has a return type. 4769 // (The parser checks for a return type and makes the declarator a 4770 // constructor if it has no return type). 4771 if (Name.getAsIdentifierInfo() && 4772 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4773 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4774 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4775 << SourceRange(D.getIdentifierLoc()); 4776 return 0; 4777 } 4778 4779 bool isStatic = SC == SC_Static; 4780 4781 // [class.free]p1: 4782 // Any allocation function for a class T is a static member 4783 // (even if not explicitly declared static). 4784 if (Name.getCXXOverloadedOperator() == OO_New || 4785 Name.getCXXOverloadedOperator() == OO_Array_New) 4786 isStatic = true; 4787 4788 // [class.free]p6 Any deallocation function for a class X is a static member 4789 // (even if not explicitly declared static). 4790 if (Name.getCXXOverloadedOperator() == OO_Delete || 4791 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4792 isStatic = true; 4793 4794 IsVirtualOkay = !isStatic; 4795 4796 // This is a C++ method declaration. 4797 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4798 D.getLocStart(), NameInfo, R, 4799 TInfo, isStatic, SCAsWritten, isInline, 4800 isConstexpr, SourceLocation()); 4801 4802 } else { 4803 // Determine whether the function was written with a 4804 // prototype. This true when: 4805 // - we're in C++ (where every function has a prototype), 4806 return FunctionDecl::Create(SemaRef.Context, DC, 4807 D.getLocStart(), 4808 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4809 true/*HasPrototype*/, isConstexpr); 4810 } 4811} 4812 4813NamedDecl* 4814Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4815 TypeSourceInfo *TInfo, LookupResult &Previous, 4816 MultiTemplateParamsArg TemplateParamLists, 4817 bool &AddToScope) { 4818 QualType R = TInfo->getType(); 4819 4820 assert(R.getTypePtr()->isFunctionType()); 4821 4822 // TODO: consider using NameInfo for diagnostic. 4823 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4824 DeclarationName Name = NameInfo.getName(); 4825 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4826 4827 if (D.getDeclSpec().isThreadSpecified()) 4828 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4829 4830 // Do not allow returning a objc interface by-value. 4831 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4832 Diag(D.getIdentifierLoc(), 4833 diag::err_object_cannot_be_passed_returned_by_value) << 0 4834 << R->getAs<FunctionType>()->getResultType() 4835 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4836 4837 QualType T = R->getAs<FunctionType>()->getResultType(); 4838 T = Context.getObjCObjectPointerType(T); 4839 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4840 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4841 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4842 FPT->getNumArgs(), EPI); 4843 } 4844 else if (isa<FunctionNoProtoType>(R)) 4845 R = Context.getFunctionNoProtoType(T); 4846 } 4847 4848 bool isFriend = false; 4849 FunctionTemplateDecl *FunctionTemplate = 0; 4850 bool isExplicitSpecialization = false; 4851 bool isFunctionTemplateSpecialization = false; 4852 bool isDependentClassScopeExplicitSpecialization = false; 4853 bool isVirtualOkay = false; 4854 4855 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4856 isVirtualOkay); 4857 if (!NewFD) return 0; 4858 4859 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 4860 NewFD->setTopLevelDeclInObjCContainer(); 4861 4862 if (getLangOptions().CPlusPlus) { 4863 bool isInline = D.getDeclSpec().isInlineSpecified(); 4864 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4865 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4866 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4867 isFriend = D.getDeclSpec().isFriendSpecified(); 4868 if (isFriend && !isInline && D.isFunctionDefinition()) { 4869 // C++ [class.friend]p5 4870 // A function can be defined in a friend declaration of a 4871 // class . . . . Such a function is implicitly inline. 4872 NewFD->setImplicitlyInline(); 4873 } 4874 4875 SetNestedNameSpecifier(NewFD, D); 4876 isExplicitSpecialization = false; 4877 isFunctionTemplateSpecialization = false; 4878 if (D.isInvalidType()) 4879 NewFD->setInvalidDecl(); 4880 4881 // Set the lexical context. If the declarator has a C++ 4882 // scope specifier, or is the object of a friend declaration, the 4883 // lexical context will be different from the semantic context. 4884 NewFD->setLexicalDeclContext(CurContext); 4885 4886 // Match up the template parameter lists with the scope specifier, then 4887 // determine whether we have a template or a template specialization. 4888 bool Invalid = false; 4889 if (TemplateParameterList *TemplateParams 4890 = MatchTemplateParametersToScopeSpecifier( 4891 D.getDeclSpec().getLocStart(), 4892 D.getIdentifierLoc(), 4893 D.getCXXScopeSpec(), 4894 TemplateParamLists.get(), 4895 TemplateParamLists.size(), 4896 isFriend, 4897 isExplicitSpecialization, 4898 Invalid)) { 4899 if (TemplateParams->size() > 0) { 4900 // This is a function template 4901 4902 // Check that we can declare a template here. 4903 if (CheckTemplateDeclScope(S, TemplateParams)) 4904 return 0; 4905 4906 // A destructor cannot be a template. 4907 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4908 Diag(NewFD->getLocation(), diag::err_destructor_template); 4909 return 0; 4910 } 4911 4912 // If we're adding a template to a dependent context, we may need to 4913 // rebuilding some of the types used within the template parameter list, 4914 // now that we know what the current instantiation is. 4915 if (DC->isDependentContext()) { 4916 ContextRAII SavedContext(*this, DC); 4917 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4918 Invalid = true; 4919 } 4920 4921 4922 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4923 NewFD->getLocation(), 4924 Name, TemplateParams, 4925 NewFD); 4926 FunctionTemplate->setLexicalDeclContext(CurContext); 4927 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4928 4929 // For source fidelity, store the other template param lists. 4930 if (TemplateParamLists.size() > 1) { 4931 NewFD->setTemplateParameterListsInfo(Context, 4932 TemplateParamLists.size() - 1, 4933 TemplateParamLists.release()); 4934 } 4935 } else { 4936 // This is a function template specialization. 4937 isFunctionTemplateSpecialization = true; 4938 // For source fidelity, store all the template param lists. 4939 NewFD->setTemplateParameterListsInfo(Context, 4940 TemplateParamLists.size(), 4941 TemplateParamLists.release()); 4942 4943 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4944 if (isFriend) { 4945 // We want to remove the "template<>", found here. 4946 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4947 4948 // If we remove the template<> and the name is not a 4949 // template-id, we're actually silently creating a problem: 4950 // the friend declaration will refer to an untemplated decl, 4951 // and clearly the user wants a template specialization. So 4952 // we need to insert '<>' after the name. 4953 SourceLocation InsertLoc; 4954 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4955 InsertLoc = D.getName().getSourceRange().getEnd(); 4956 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4957 } 4958 4959 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4960 << Name << RemoveRange 4961 << FixItHint::CreateRemoval(RemoveRange) 4962 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4963 } 4964 } 4965 } 4966 else { 4967 // All template param lists were matched against the scope specifier: 4968 // this is NOT (an explicit specialization of) a template. 4969 if (TemplateParamLists.size() > 0) 4970 // For source fidelity, store all the template param lists. 4971 NewFD->setTemplateParameterListsInfo(Context, 4972 TemplateParamLists.size(), 4973 TemplateParamLists.release()); 4974 } 4975 4976 if (Invalid) { 4977 NewFD->setInvalidDecl(); 4978 if (FunctionTemplate) 4979 FunctionTemplate->setInvalidDecl(); 4980 } 4981 4982 // If we see "T var();" at block scope, where T is a class type, it is 4983 // probably an attempt to initialize a variable, not a function declaration. 4984 // We don't catch this case earlier, since there is no ambiguity here. 4985 if (!FunctionTemplate && D.getFunctionDefinitionKind() == FDK_Declaration && 4986 CurContext->isFunctionOrMethod() && 4987 D.getNumTypeObjects() == 1 && D.isFunctionDeclarator() && 4988 D.getDeclSpec().getStorageClassSpecAsWritten() 4989 == DeclSpec::SCS_unspecified) { 4990 QualType T = R->getAs<FunctionType>()->getResultType(); 4991 DeclaratorChunk &C = D.getTypeObject(0); 4992 if (!T->isVoidType() && C.Fun.NumArgs == 0 && !C.Fun.isVariadic && 4993 !C.Fun.TrailingReturnType && 4994 C.Fun.getExceptionSpecType() == EST_None) { 4995 SourceRange ParenRange(C.Loc, C.EndLoc); 4996 Diag(C.Loc, diag::warn_empty_parens_are_function_decl) << ParenRange; 4997 4998 // If the declaration looks like: 4999 // T var1, 5000 // f(); 5001 // and name lookup finds a function named 'f', then the ',' was 5002 // probably intended to be a ';'. 5003 if (!D.isFirstDeclarator() && D.getIdentifier()) { 5004 FullSourceLoc Comma(D.getCommaLoc(), SourceMgr); 5005 FullSourceLoc Name(D.getIdentifierLoc(), SourceMgr); 5006 if (Comma.getFileID() != Name.getFileID() || 5007 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 5008 LookupResult Result(*this, D.getIdentifier(), SourceLocation(), 5009 LookupOrdinaryName); 5010 if (LookupName(Result, S)) 5011 Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 5012 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") << NewFD; 5013 } 5014 } 5015 const CXXRecordDecl *RD = T->getAsCXXRecordDecl(); 5016 // Empty parens mean value-initialization, and no parens mean default 5017 // initialization. These are equivalent if the default constructor is 5018 // user-provided, or if zero-initialization is a no-op. 5019 if (RD && RD->hasDefinition() && 5020 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 5021 Diag(C.Loc, diag::note_empty_parens_default_ctor) 5022 << FixItHint::CreateRemoval(ParenRange); 5023 else if (const char *Init = getFixItZeroInitializerForType(T)) 5024 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5025 << FixItHint::CreateReplacement(ParenRange, Init); 5026 else if (LangOpts.CPlusPlus0x) 5027 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5028 << FixItHint::CreateReplacement(ParenRange, "{}"); 5029 } 5030 } 5031 5032 // C++ [dcl.fct.spec]p5: 5033 // The virtual specifier shall only be used in declarations of 5034 // nonstatic class member functions that appear within a 5035 // member-specification of a class declaration; see 10.3. 5036 // 5037 if (isVirtual && !NewFD->isInvalidDecl()) { 5038 if (!isVirtualOkay) { 5039 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5040 diag::err_virtual_non_function); 5041 } else if (!CurContext->isRecord()) { 5042 // 'virtual' was specified outside of the class. 5043 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5044 diag::err_virtual_out_of_class) 5045 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5046 } else if (NewFD->getDescribedFunctionTemplate()) { 5047 // C++ [temp.mem]p3: 5048 // A member function template shall not be virtual. 5049 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5050 diag::err_virtual_member_function_template) 5051 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5052 } else { 5053 // Okay: Add virtual to the method. 5054 NewFD->setVirtualAsWritten(true); 5055 } 5056 } 5057 5058 // C++ [dcl.fct.spec]p3: 5059 // The inline specifier shall not appear on a block scope function 5060 // declaration. 5061 if (isInline && !NewFD->isInvalidDecl()) { 5062 if (CurContext->isFunctionOrMethod()) { 5063 // 'inline' is not allowed on block scope function declaration. 5064 Diag(D.getDeclSpec().getInlineSpecLoc(), 5065 diag::err_inline_declaration_block_scope) << Name 5066 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 5067 } 5068 } 5069 5070 // C++ [dcl.fct.spec]p6: 5071 // The explicit specifier shall be used only in the declaration of a 5072 // constructor or conversion function within its class definition; 5073 // see 12.3.1 and 12.3.2. 5074 if (isExplicit && !NewFD->isInvalidDecl()) { 5075 if (!CurContext->isRecord()) { 5076 // 'explicit' was specified outside of the class. 5077 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5078 diag::err_explicit_out_of_class) 5079 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5080 } else if (!isa<CXXConstructorDecl>(NewFD) && 5081 !isa<CXXConversionDecl>(NewFD)) { 5082 // 'explicit' was specified on a function that wasn't a constructor 5083 // or conversion function. 5084 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5085 diag::err_explicit_non_ctor_or_conv_function) 5086 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5087 } 5088 } 5089 5090 if (isConstexpr) { 5091 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 5092 // are implicitly inline. 5093 NewFD->setImplicitlyInline(); 5094 5095 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 5096 // be either constructors or to return a literal type. Therefore, 5097 // destructors cannot be declared constexpr. 5098 if (isa<CXXDestructorDecl>(NewFD)) 5099 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 5100 } 5101 5102 // If __module_private__ was specified, mark the function accordingly. 5103 if (D.getDeclSpec().isModulePrivateSpecified()) { 5104 if (isFunctionTemplateSpecialization) { 5105 SourceLocation ModulePrivateLoc 5106 = D.getDeclSpec().getModulePrivateSpecLoc(); 5107 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5108 << 0 5109 << FixItHint::CreateRemoval(ModulePrivateLoc); 5110 } else { 5111 NewFD->setModulePrivate(); 5112 if (FunctionTemplate) 5113 FunctionTemplate->setModulePrivate(); 5114 } 5115 } 5116 5117 if (isFriend) { 5118 // For now, claim that the objects have no previous declaration. 5119 if (FunctionTemplate) { 5120 FunctionTemplate->setObjectOfFriendDecl(false); 5121 FunctionTemplate->setAccess(AS_public); 5122 } 5123 NewFD->setObjectOfFriendDecl(false); 5124 NewFD->setAccess(AS_public); 5125 } 5126 5127 // If a function is defined as defaulted or deleted, mark it as such now. 5128 switch (D.getFunctionDefinitionKind()) { 5129 case FDK_Declaration: 5130 case FDK_Definition: 5131 break; 5132 5133 case FDK_Defaulted: 5134 NewFD->setDefaulted(); 5135 break; 5136 5137 case FDK_Deleted: 5138 NewFD->setDeletedAsWritten(); 5139 break; 5140 } 5141 5142 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5143 D.isFunctionDefinition()) { 5144 // C++ [class.mfct]p2: 5145 // A member function may be defined (8.4) in its class definition, in 5146 // which case it is an inline member function (7.1.2) 5147 NewFD->setImplicitlyInline(); 5148 } 5149 5150 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5151 !CurContext->isRecord()) { 5152 // C++ [class.static]p1: 5153 // A data or function member of a class may be declared static 5154 // in a class definition, in which case it is a static member of 5155 // the class. 5156 5157 // Complain about the 'static' specifier if it's on an out-of-line 5158 // member function definition. 5159 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5160 diag::err_static_out_of_line) 5161 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5162 } 5163 } 5164 5165 // Filter out previous declarations that don't match the scope. 5166 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5167 isExplicitSpecialization || 5168 isFunctionTemplateSpecialization); 5169 5170 // Handle GNU asm-label extension (encoded as an attribute). 5171 if (Expr *E = (Expr*) D.getAsmLabel()) { 5172 // The parser guarantees this is a string. 5173 StringLiteral *SE = cast<StringLiteral>(E); 5174 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5175 SE->getString())); 5176 } else if (!ExtnameUndeclaredIdentifiers.empty()) { 5177 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I = 5178 ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier()); 5179 if (I != ExtnameUndeclaredIdentifiers.end()) { 5180 NewFD->addAttr(I->second); 5181 ExtnameUndeclaredIdentifiers.erase(I); 5182 } 5183 } 5184 5185 // Copy the parameter declarations from the declarator D to the function 5186 // declaration NewFD, if they are available. First scavenge them into Params. 5187 SmallVector<ParmVarDecl*, 16> Params; 5188 if (D.isFunctionDeclarator()) { 5189 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5190 5191 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5192 // function that takes no arguments, not a function that takes a 5193 // single void argument. 5194 // We let through "const void" here because Sema::GetTypeForDeclarator 5195 // already checks for that case. 5196 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5197 FTI.ArgInfo[0].Param && 5198 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5199 // Empty arg list, don't push any params. 5200 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5201 5202 // In C++, the empty parameter-type-list must be spelled "void"; a 5203 // typedef of void is not permitted. 5204 if (getLangOptions().CPlusPlus && 5205 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5206 bool IsTypeAlias = false; 5207 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5208 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5209 else if (const TemplateSpecializationType *TST = 5210 Param->getType()->getAs<TemplateSpecializationType>()) 5211 IsTypeAlias = TST->isTypeAlias(); 5212 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5213 << IsTypeAlias; 5214 } 5215 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5216 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5217 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5218 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5219 Param->setDeclContext(NewFD); 5220 Params.push_back(Param); 5221 5222 if (Param->isInvalidDecl()) 5223 NewFD->setInvalidDecl(); 5224 } 5225 } 5226 5227 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5228 // When we're declaring a function with a typedef, typeof, etc as in the 5229 // following example, we'll need to synthesize (unnamed) 5230 // parameters for use in the declaration. 5231 // 5232 // @code 5233 // typedef void fn(int); 5234 // fn f; 5235 // @endcode 5236 5237 // Synthesize a parameter for each argument type. 5238 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5239 AE = FT->arg_type_end(); AI != AE; ++AI) { 5240 ParmVarDecl *Param = 5241 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5242 Param->setScopeInfo(0, Params.size()); 5243 Params.push_back(Param); 5244 } 5245 } else { 5246 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5247 "Should not need args for typedef of non-prototype fn"); 5248 } 5249 5250 // Finally, we know we have the right number of parameters, install them. 5251 NewFD->setParams(Params); 5252 5253 // Find all anonymous symbols defined during the declaration of this function 5254 // and add to NewFD. This lets us track decls such 'enum Y' in: 5255 // 5256 // void f(enum Y {AA} x) {} 5257 // 5258 // which would otherwise incorrectly end up in the translation unit scope. 5259 NewFD->setDeclsInPrototypeScope(DeclsInPrototypeScope); 5260 DeclsInPrototypeScope.clear(); 5261 5262 // Process the non-inheritable attributes on this declaration. 5263 ProcessDeclAttributes(S, NewFD, D, 5264 /*NonInheritable=*/true, /*Inheritable=*/false); 5265 5266 if (!getLangOptions().CPlusPlus) { 5267 // Perform semantic checking on the function declaration. 5268 bool isExplicitSpecialization=false; 5269 if (!NewFD->isInvalidDecl()) { 5270 if (NewFD->getResultType()->isVariablyModifiedType()) { 5271 // Functions returning a variably modified type violate C99 6.7.5.2p2 5272 // because all functions have linkage. 5273 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5274 NewFD->setInvalidDecl(); 5275 } else { 5276 if (NewFD->isMain()) 5277 CheckMain(NewFD, D.getDeclSpec()); 5278 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5279 isExplicitSpecialization)); 5280 } 5281 } 5282 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5283 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5284 "previous declaration set still overloaded"); 5285 } else { 5286 // If the declarator is a template-id, translate the parser's template 5287 // argument list into our AST format. 5288 bool HasExplicitTemplateArgs = false; 5289 TemplateArgumentListInfo TemplateArgs; 5290 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5291 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5292 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5293 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5294 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5295 TemplateId->getTemplateArgs(), 5296 TemplateId->NumArgs); 5297 translateTemplateArguments(TemplateArgsPtr, 5298 TemplateArgs); 5299 TemplateArgsPtr.release(); 5300 5301 HasExplicitTemplateArgs = true; 5302 5303 if (NewFD->isInvalidDecl()) { 5304 HasExplicitTemplateArgs = false; 5305 } else if (FunctionTemplate) { 5306 // Function template with explicit template arguments. 5307 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5308 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5309 5310 HasExplicitTemplateArgs = false; 5311 } else if (!isFunctionTemplateSpecialization && 5312 !D.getDeclSpec().isFriendSpecified()) { 5313 // We have encountered something that the user meant to be a 5314 // specialization (because it has explicitly-specified template 5315 // arguments) but that was not introduced with a "template<>" (or had 5316 // too few of them). 5317 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5318 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5319 << FixItHint::CreateInsertion( 5320 D.getDeclSpec().getLocStart(), 5321 "template<> "); 5322 isFunctionTemplateSpecialization = true; 5323 } else { 5324 // "friend void foo<>(int);" is an implicit specialization decl. 5325 isFunctionTemplateSpecialization = true; 5326 } 5327 } else if (isFriend && isFunctionTemplateSpecialization) { 5328 // This combination is only possible in a recovery case; the user 5329 // wrote something like: 5330 // template <> friend void foo(int); 5331 // which we're recovering from as if the user had written: 5332 // friend void foo<>(int); 5333 // Go ahead and fake up a template id. 5334 HasExplicitTemplateArgs = true; 5335 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5336 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5337 } 5338 5339 // If it's a friend (and only if it's a friend), it's possible 5340 // that either the specialized function type or the specialized 5341 // template is dependent, and therefore matching will fail. In 5342 // this case, don't check the specialization yet. 5343 bool InstantiationDependent = false; 5344 if (isFunctionTemplateSpecialization && isFriend && 5345 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5346 TemplateSpecializationType::anyDependentTemplateArguments( 5347 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5348 InstantiationDependent))) { 5349 assert(HasExplicitTemplateArgs && 5350 "friend function specialization without template args"); 5351 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5352 Previous)) 5353 NewFD->setInvalidDecl(); 5354 } else if (isFunctionTemplateSpecialization) { 5355 if (CurContext->isDependentContext() && CurContext->isRecord() 5356 && !isFriend) { 5357 isDependentClassScopeExplicitSpecialization = true; 5358 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5359 diag::ext_function_specialization_in_class : 5360 diag::err_function_specialization_in_class) 5361 << NewFD->getDeclName(); 5362 } else if (CheckFunctionTemplateSpecialization(NewFD, 5363 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5364 Previous)) 5365 NewFD->setInvalidDecl(); 5366 5367 // C++ [dcl.stc]p1: 5368 // A storage-class-specifier shall not be specified in an explicit 5369 // specialization (14.7.3) 5370 if (SC != SC_None) { 5371 if (SC != NewFD->getStorageClass()) 5372 Diag(NewFD->getLocation(), 5373 diag::err_explicit_specialization_inconsistent_storage_class) 5374 << SC 5375 << FixItHint::CreateRemoval( 5376 D.getDeclSpec().getStorageClassSpecLoc()); 5377 5378 else 5379 Diag(NewFD->getLocation(), 5380 diag::ext_explicit_specialization_storage_class) 5381 << FixItHint::CreateRemoval( 5382 D.getDeclSpec().getStorageClassSpecLoc()); 5383 } 5384 5385 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5386 if (CheckMemberSpecialization(NewFD, Previous)) 5387 NewFD->setInvalidDecl(); 5388 } 5389 5390 // Perform semantic checking on the function declaration. 5391 if (!isDependentClassScopeExplicitSpecialization) { 5392 if (NewFD->isInvalidDecl()) { 5393 // If this is a class member, mark the class invalid immediately. 5394 // This avoids some consistency errors later. 5395 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5396 methodDecl->getParent()->setInvalidDecl(); 5397 } else { 5398 if (NewFD->isMain()) 5399 CheckMain(NewFD, D.getDeclSpec()); 5400 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5401 isExplicitSpecialization)); 5402 } 5403 } 5404 5405 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5406 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5407 "previous declaration set still overloaded"); 5408 5409 NamedDecl *PrincipalDecl = (FunctionTemplate 5410 ? cast<NamedDecl>(FunctionTemplate) 5411 : NewFD); 5412 5413 if (isFriend && D.isRedeclaration()) { 5414 AccessSpecifier Access = AS_public; 5415 if (!NewFD->isInvalidDecl()) 5416 Access = NewFD->getPreviousDecl()->getAccess(); 5417 5418 NewFD->setAccess(Access); 5419 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5420 5421 PrincipalDecl->setObjectOfFriendDecl(true); 5422 } 5423 5424 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5425 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5426 PrincipalDecl->setNonMemberOperator(); 5427 5428 // If we have a function template, check the template parameter 5429 // list. This will check and merge default template arguments. 5430 if (FunctionTemplate) { 5431 FunctionTemplateDecl *PrevTemplate = 5432 FunctionTemplate->getPreviousDecl(); 5433 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5434 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5435 D.getDeclSpec().isFriendSpecified() 5436 ? (D.isFunctionDefinition() 5437 ? TPC_FriendFunctionTemplateDefinition 5438 : TPC_FriendFunctionTemplate) 5439 : (D.getCXXScopeSpec().isSet() && 5440 DC && DC->isRecord() && 5441 DC->isDependentContext()) 5442 ? TPC_ClassTemplateMember 5443 : TPC_FunctionTemplate); 5444 } 5445 5446 if (NewFD->isInvalidDecl()) { 5447 // Ignore all the rest of this. 5448 } else if (!D.isRedeclaration()) { 5449 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5450 AddToScope }; 5451 // Fake up an access specifier if it's supposed to be a class member. 5452 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5453 NewFD->setAccess(AS_public); 5454 5455 // Qualified decls generally require a previous declaration. 5456 if (D.getCXXScopeSpec().isSet()) { 5457 // ...with the major exception of templated-scope or 5458 // dependent-scope friend declarations. 5459 5460 // TODO: we currently also suppress this check in dependent 5461 // contexts because (1) the parameter depth will be off when 5462 // matching friend templates and (2) we might actually be 5463 // selecting a friend based on a dependent factor. But there 5464 // are situations where these conditions don't apply and we 5465 // can actually do this check immediately. 5466 if (isFriend && 5467 (TemplateParamLists.size() || 5468 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5469 CurContext->isDependentContext())) { 5470 // ignore these 5471 } else { 5472 // The user tried to provide an out-of-line definition for a 5473 // function that is a member of a class or namespace, but there 5474 // was no such member function declared (C++ [class.mfct]p2, 5475 // C++ [namespace.memdef]p2). For example: 5476 // 5477 // class X { 5478 // void f() const; 5479 // }; 5480 // 5481 // void X::f() { } // ill-formed 5482 // 5483 // Complain about this problem, and attempt to suggest close 5484 // matches (e.g., those that differ only in cv-qualifiers and 5485 // whether the parameter types are references). 5486 5487 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5488 NewFD, 5489 ExtraArgs)) { 5490 AddToScope = ExtraArgs.AddToScope; 5491 return Result; 5492 } 5493 } 5494 5495 // Unqualified local friend declarations are required to resolve 5496 // to something. 5497 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5498 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5499 NewFD, 5500 ExtraArgs)) { 5501 AddToScope = ExtraArgs.AddToScope; 5502 return Result; 5503 } 5504 } 5505 5506 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5507 !isFriend && !isFunctionTemplateSpecialization && 5508 !isExplicitSpecialization) { 5509 // An out-of-line member function declaration must also be a 5510 // definition (C++ [dcl.meaning]p1). 5511 // Note that this is not the case for explicit specializations of 5512 // function templates or member functions of class templates, per 5513 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5514 // extension for compatibility with old SWIG code which likes to 5515 // generate them. 5516 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5517 << D.getCXXScopeSpec().getRange(); 5518 } 5519 } 5520 5521 5522 // Handle attributes. We need to have merged decls when handling attributes 5523 // (for example to check for conflicts, etc). 5524 // FIXME: This needs to happen before we merge declarations. Then, 5525 // let attribute merging cope with attribute conflicts. 5526 ProcessDeclAttributes(S, NewFD, D, 5527 /*NonInheritable=*/false, /*Inheritable=*/true); 5528 5529 // attributes declared post-definition are currently ignored 5530 // FIXME: This should happen during attribute merging 5531 if (D.isRedeclaration() && Previous.isSingleResult()) { 5532 const FunctionDecl *Def; 5533 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5534 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5535 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5536 Diag(Def->getLocation(), diag::note_previous_definition); 5537 } 5538 } 5539 5540 AddKnownFunctionAttributes(NewFD); 5541 5542 if (NewFD->hasAttr<OverloadableAttr>() && 5543 !NewFD->getType()->getAs<FunctionProtoType>()) { 5544 Diag(NewFD->getLocation(), 5545 diag::err_attribute_overloadable_no_prototype) 5546 << NewFD; 5547 5548 // Turn this into a variadic function with no parameters. 5549 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5550 FunctionProtoType::ExtProtoInfo EPI; 5551 EPI.Variadic = true; 5552 EPI.ExtInfo = FT->getExtInfo(); 5553 5554 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5555 NewFD->setType(R); 5556 } 5557 5558 // If there's a #pragma GCC visibility in scope, and this isn't a class 5559 // member, set the visibility of this function. 5560 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5561 AddPushedVisibilityAttribute(NewFD); 5562 5563 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5564 // marking the function. 5565 AddCFAuditedAttribute(NewFD); 5566 5567 // If this is a locally-scoped extern C function, update the 5568 // map of such names. 5569 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5570 && !NewFD->isInvalidDecl()) 5571 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5572 5573 // Set this FunctionDecl's range up to the right paren. 5574 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5575 5576 if (getLangOptions().CPlusPlus) { 5577 if (FunctionTemplate) { 5578 if (NewFD->isInvalidDecl()) 5579 FunctionTemplate->setInvalidDecl(); 5580 return FunctionTemplate; 5581 } 5582 } 5583 5584 MarkUnusedFileScopedDecl(NewFD); 5585 5586 if (getLangOptions().CUDA) 5587 if (IdentifierInfo *II = NewFD->getIdentifier()) 5588 if (!NewFD->isInvalidDecl() && 5589 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5590 if (II->isStr("cudaConfigureCall")) { 5591 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5592 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5593 5594 Context.setcudaConfigureCallDecl(NewFD); 5595 } 5596 } 5597 5598 // Here we have an function template explicit specialization at class scope. 5599 // The actually specialization will be postponed to template instatiation 5600 // time via the ClassScopeFunctionSpecializationDecl node. 5601 if (isDependentClassScopeExplicitSpecialization) { 5602 ClassScopeFunctionSpecializationDecl *NewSpec = 5603 ClassScopeFunctionSpecializationDecl::Create( 5604 Context, CurContext, SourceLocation(), 5605 cast<CXXMethodDecl>(NewFD)); 5606 CurContext->addDecl(NewSpec); 5607 AddToScope = false; 5608 } 5609 5610 return NewFD; 5611} 5612 5613/// \brief Perform semantic checking of a new function declaration. 5614/// 5615/// Performs semantic analysis of the new function declaration 5616/// NewFD. This routine performs all semantic checking that does not 5617/// require the actual declarator involved in the declaration, and is 5618/// used both for the declaration of functions as they are parsed 5619/// (called via ActOnDeclarator) and for the declaration of functions 5620/// that have been instantiated via C++ template instantiation (called 5621/// via InstantiateDecl). 5622/// 5623/// \param IsExplicitSpecialiation whether this new function declaration is 5624/// an explicit specialization of the previous declaration. 5625/// 5626/// This sets NewFD->isInvalidDecl() to true if there was an error. 5627/// 5628/// Returns true if the function declaration is a redeclaration. 5629bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5630 LookupResult &Previous, 5631 bool IsExplicitSpecialization) { 5632 assert(!NewFD->getResultType()->isVariablyModifiedType() 5633 && "Variably modified return types are not handled here"); 5634 5635 // Check for a previous declaration of this name. 5636 if (Previous.empty() && NewFD->isExternC()) { 5637 // Since we did not find anything by this name and we're declaring 5638 // an extern "C" function, look for a non-visible extern "C" 5639 // declaration with the same name. 5640 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5641 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5642 if (Pos != LocallyScopedExternalDecls.end()) 5643 Previous.addDecl(Pos->second); 5644 } 5645 5646 bool Redeclaration = false; 5647 5648 // Merge or overload the declaration with an existing declaration of 5649 // the same name, if appropriate. 5650 if (!Previous.empty()) { 5651 // Determine whether NewFD is an overload of PrevDecl or 5652 // a declaration that requires merging. If it's an overload, 5653 // there's no more work to do here; we'll just add the new 5654 // function to the scope. 5655 5656 NamedDecl *OldDecl = 0; 5657 if (!AllowOverloadingOfFunction(Previous, Context)) { 5658 Redeclaration = true; 5659 OldDecl = Previous.getFoundDecl(); 5660 } else { 5661 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5662 /*NewIsUsingDecl*/ false)) { 5663 case Ovl_Match: 5664 Redeclaration = true; 5665 break; 5666 5667 case Ovl_NonFunction: 5668 Redeclaration = true; 5669 break; 5670 5671 case Ovl_Overload: 5672 Redeclaration = false; 5673 break; 5674 } 5675 5676 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5677 // If a function name is overloadable in C, then every function 5678 // with that name must be marked "overloadable". 5679 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5680 << Redeclaration << NewFD; 5681 NamedDecl *OverloadedDecl = 0; 5682 if (Redeclaration) 5683 OverloadedDecl = OldDecl; 5684 else if (!Previous.empty()) 5685 OverloadedDecl = Previous.getRepresentativeDecl(); 5686 if (OverloadedDecl) 5687 Diag(OverloadedDecl->getLocation(), 5688 diag::note_attribute_overloadable_prev_overload); 5689 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5690 Context)); 5691 } 5692 } 5693 5694 if (Redeclaration) { 5695 // NewFD and OldDecl represent declarations that need to be 5696 // merged. 5697 if (MergeFunctionDecl(NewFD, OldDecl)) { 5698 NewFD->setInvalidDecl(); 5699 return Redeclaration; 5700 } 5701 5702 Previous.clear(); 5703 Previous.addDecl(OldDecl); 5704 5705 if (FunctionTemplateDecl *OldTemplateDecl 5706 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5707 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5708 FunctionTemplateDecl *NewTemplateDecl 5709 = NewFD->getDescribedFunctionTemplate(); 5710 assert(NewTemplateDecl && "Template/non-template mismatch"); 5711 if (CXXMethodDecl *Method 5712 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5713 Method->setAccess(OldTemplateDecl->getAccess()); 5714 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5715 } 5716 5717 // If this is an explicit specialization of a member that is a function 5718 // template, mark it as a member specialization. 5719 if (IsExplicitSpecialization && 5720 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5721 NewTemplateDecl->setMemberSpecialization(); 5722 assert(OldTemplateDecl->isMemberSpecialization()); 5723 } 5724 5725 } else { 5726 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5727 NewFD->setAccess(OldDecl->getAccess()); 5728 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5729 } 5730 } 5731 } 5732 5733 // Semantic checking for this function declaration (in isolation). 5734 if (getLangOptions().CPlusPlus) { 5735 // C++-specific checks. 5736 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5737 CheckConstructor(Constructor); 5738 } else if (CXXDestructorDecl *Destructor = 5739 dyn_cast<CXXDestructorDecl>(NewFD)) { 5740 CXXRecordDecl *Record = Destructor->getParent(); 5741 QualType ClassType = Context.getTypeDeclType(Record); 5742 5743 // FIXME: Shouldn't we be able to perform this check even when the class 5744 // type is dependent? Both gcc and edg can handle that. 5745 if (!ClassType->isDependentType()) { 5746 DeclarationName Name 5747 = Context.DeclarationNames.getCXXDestructorName( 5748 Context.getCanonicalType(ClassType)); 5749 if (NewFD->getDeclName() != Name) { 5750 Diag(NewFD->getLocation(), diag::err_destructor_name); 5751 NewFD->setInvalidDecl(); 5752 return Redeclaration; 5753 } 5754 } 5755 } else if (CXXConversionDecl *Conversion 5756 = dyn_cast<CXXConversionDecl>(NewFD)) { 5757 ActOnConversionDeclarator(Conversion); 5758 } 5759 5760 // Find any virtual functions that this function overrides. 5761 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5762 if (!Method->isFunctionTemplateSpecialization() && 5763 !Method->getDescribedFunctionTemplate()) { 5764 if (AddOverriddenMethods(Method->getParent(), Method)) { 5765 // If the function was marked as "static", we have a problem. 5766 if (NewFD->getStorageClass() == SC_Static) { 5767 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5768 << NewFD->getDeclName(); 5769 for (CXXMethodDecl::method_iterator 5770 Overridden = Method->begin_overridden_methods(), 5771 OverriddenEnd = Method->end_overridden_methods(); 5772 Overridden != OverriddenEnd; 5773 ++Overridden) { 5774 Diag((*Overridden)->getLocation(), 5775 diag::note_overridden_virtual_function); 5776 } 5777 } 5778 } 5779 } 5780 } 5781 5782 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5783 if (NewFD->isOverloadedOperator() && 5784 CheckOverloadedOperatorDeclaration(NewFD)) { 5785 NewFD->setInvalidDecl(); 5786 return Redeclaration; 5787 } 5788 5789 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5790 if (NewFD->getLiteralIdentifier() && 5791 CheckLiteralOperatorDeclaration(NewFD)) { 5792 NewFD->setInvalidDecl(); 5793 return Redeclaration; 5794 } 5795 5796 // In C++, check default arguments now that we have merged decls. Unless 5797 // the lexical context is the class, because in this case this is done 5798 // during delayed parsing anyway. 5799 if (!CurContext->isRecord()) 5800 CheckCXXDefaultArguments(NewFD); 5801 5802 // If this function declares a builtin function, check the type of this 5803 // declaration against the expected type for the builtin. 5804 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5805 ASTContext::GetBuiltinTypeError Error; 5806 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5807 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5808 // The type of this function differs from the type of the builtin, 5809 // so forget about the builtin entirely. 5810 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5811 } 5812 } 5813 5814 // If this function is declared as being extern "C", then check to see if 5815 // the function returns a UDT (class, struct, or union type) that is not C 5816 // compatible, and if it does, warn the user. 5817 if (NewFD->isExternC()) { 5818 QualType R = NewFD->getResultType(); 5819 if (!R.isPODType(Context) && 5820 !R->isVoidType()) 5821 Diag( NewFD->getLocation(), diag::warn_return_value_udt ) 5822 << NewFD << R; 5823 } 5824 } 5825 return Redeclaration; 5826} 5827 5828void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5829 // C++11 [basic.start.main]p3: A program that declares main to be inline, 5830 // static or constexpr is ill-formed. 5831 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5832 // shall not appear in a declaration of main. 5833 // static main is not an error under C99, but we should warn about it. 5834 if (FD->getStorageClass() == SC_Static) 5835 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5836 ? diag::err_static_main : diag::warn_static_main) 5837 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5838 if (FD->isInlineSpecified()) 5839 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5840 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5841 if (FD->isConstexpr()) { 5842 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main) 5843 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc()); 5844 FD->setConstexpr(false); 5845 } 5846 5847 QualType T = FD->getType(); 5848 assert(T->isFunctionType() && "function decl is not of function type"); 5849 const FunctionType* FT = T->castAs<FunctionType>(); 5850 5851 // All the standards say that main() should should return 'int'. 5852 if (Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5853 // In C and C++, main magically returns 0 if you fall off the end; 5854 // set the flag which tells us that. 5855 // This is C++ [basic.start.main]p5 and C99 5.1.2.2.3. 5856 FD->setHasImplicitReturnZero(true); 5857 5858 // In C with GNU extensions we allow main() to have non-integer return 5859 // type, but we should warn about the extension, and we disable the 5860 // implicit-return-zero rule. 5861 } else if (getLangOptions().GNUMode && !getLangOptions().CPlusPlus) { 5862 Diag(FD->getTypeSpecStartLoc(), diag::ext_main_returns_nonint); 5863 5864 // Otherwise, this is just a flat-out error. 5865 } else { 5866 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5867 FD->setInvalidDecl(true); 5868 } 5869 5870 // Treat protoless main() as nullary. 5871 if (isa<FunctionNoProtoType>(FT)) return; 5872 5873 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5874 unsigned nparams = FTP->getNumArgs(); 5875 assert(FD->getNumParams() == nparams); 5876 5877 bool HasExtraParameters = (nparams > 3); 5878 5879 // Darwin passes an undocumented fourth argument of type char**. If 5880 // other platforms start sprouting these, the logic below will start 5881 // getting shifty. 5882 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5883 HasExtraParameters = false; 5884 5885 if (HasExtraParameters) { 5886 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5887 FD->setInvalidDecl(true); 5888 nparams = 3; 5889 } 5890 5891 // FIXME: a lot of the following diagnostics would be improved 5892 // if we had some location information about types. 5893 5894 QualType CharPP = 5895 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5896 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5897 5898 for (unsigned i = 0; i < nparams; ++i) { 5899 QualType AT = FTP->getArgType(i); 5900 5901 bool mismatch = true; 5902 5903 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5904 mismatch = false; 5905 else if (Expected[i] == CharPP) { 5906 // As an extension, the following forms are okay: 5907 // char const ** 5908 // char const * const * 5909 // char * const * 5910 5911 QualifierCollector qs; 5912 const PointerType* PT; 5913 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5914 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5915 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5916 qs.removeConst(); 5917 mismatch = !qs.empty(); 5918 } 5919 } 5920 5921 if (mismatch) { 5922 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5923 // TODO: suggest replacing given type with expected type 5924 FD->setInvalidDecl(true); 5925 } 5926 } 5927 5928 if (nparams == 1 && !FD->isInvalidDecl()) { 5929 Diag(FD->getLocation(), diag::warn_main_one_arg); 5930 } 5931 5932 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5933 Diag(FD->getLocation(), diag::err_main_template_decl); 5934 FD->setInvalidDecl(); 5935 } 5936} 5937 5938bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5939 // FIXME: Need strict checking. In C89, we need to check for 5940 // any assignment, increment, decrement, function-calls, or 5941 // commas outside of a sizeof. In C99, it's the same list, 5942 // except that the aforementioned are allowed in unevaluated 5943 // expressions. Everything else falls under the 5944 // "may accept other forms of constant expressions" exception. 5945 // (We never end up here for C++, so the constant expression 5946 // rules there don't matter.) 5947 if (Init->isConstantInitializer(Context, false)) 5948 return false; 5949 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5950 << Init->getSourceRange(); 5951 return true; 5952} 5953 5954namespace { 5955 // Visits an initialization expression to see if OrigDecl is evaluated in 5956 // its own initialization and throws a warning if it does. 5957 class SelfReferenceChecker 5958 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5959 Sema &S; 5960 Decl *OrigDecl; 5961 bool isRecordType; 5962 bool isPODType; 5963 5964 public: 5965 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5966 5967 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5968 S(S), OrigDecl(OrigDecl) { 5969 isPODType = false; 5970 isRecordType = false; 5971 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5972 isPODType = VD->getType().isPODType(S.Context); 5973 isRecordType = VD->getType()->isRecordType(); 5974 } 5975 } 5976 5977 void VisitExpr(Expr *E) { 5978 if (isa<ObjCMessageExpr>(*E)) return; 5979 if (isRecordType) { 5980 Expr *expr = E; 5981 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5982 ValueDecl *VD = ME->getMemberDecl(); 5983 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5984 expr = ME->getBase(); 5985 } 5986 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5987 HandleDeclRefExpr(DRE); 5988 return; 5989 } 5990 } 5991 Inherited::VisitExpr(E); 5992 } 5993 5994 void VisitMemberExpr(MemberExpr *E) { 5995 if (E->getType()->canDecayToPointerType()) return; 5996 ValueDecl *VD = E->getMemberDecl(); 5997 if (isa<FieldDecl>(VD) || isa<CXXMethodDecl>(VD)) 5998 if (DeclRefExpr *DRE 5999 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 6000 HandleDeclRefExpr(DRE); 6001 return; 6002 } 6003 Inherited::VisitMemberExpr(E); 6004 } 6005 6006 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 6007 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 6008 (isRecordType && E->getCastKind() == CK_NoOp)) { 6009 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 6010 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 6011 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 6012 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 6013 HandleDeclRefExpr(DRE); 6014 return; 6015 } 6016 } 6017 Inherited::VisitImplicitCastExpr(E); 6018 } 6019 6020 void VisitUnaryOperator(UnaryOperator *E) { 6021 // For POD record types, addresses of its own members are well-defined. 6022 if (isRecordType && isPODType) return; 6023 Inherited::VisitUnaryOperator(E); 6024 } 6025 6026 void HandleDeclRefExpr(DeclRefExpr *DRE) { 6027 Decl* ReferenceDecl = DRE->getDecl(); 6028 if (OrigDecl != ReferenceDecl) return; 6029 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 6030 Sema::NotForRedeclaration); 6031 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 6032 S.PDiag(diag::warn_uninit_self_reference_in_init) 6033 << Result.getLookupName() 6034 << OrigDecl->getLocation() 6035 << DRE->getSourceRange()); 6036 } 6037 }; 6038} 6039 6040/// CheckSelfReference - Warns if OrigDecl is used in expression E. 6041void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 6042 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 6043} 6044 6045/// AddInitializerToDecl - Adds the initializer Init to the 6046/// declaration dcl. If DirectInit is true, this is C++ direct 6047/// initialization rather than copy initialization. 6048void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 6049 bool DirectInit, bool TypeMayContainAuto) { 6050 // If there is no declaration, there was an error parsing it. Just ignore 6051 // the initializer. 6052 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 6053 return; 6054 6055 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 6056 // With declarators parsed the way they are, the parser cannot 6057 // distinguish between a normal initializer and a pure-specifier. 6058 // Thus this grotesque test. 6059 IntegerLiteral *IL; 6060 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 6061 Context.getCanonicalType(IL->getType()) == Context.IntTy) 6062 CheckPureMethod(Method, Init->getSourceRange()); 6063 else { 6064 Diag(Method->getLocation(), diag::err_member_function_initialization) 6065 << Method->getDeclName() << Init->getSourceRange(); 6066 Method->setInvalidDecl(); 6067 } 6068 return; 6069 } 6070 6071 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6072 if (!VDecl) { 6073 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 6074 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6075 RealDecl->setInvalidDecl(); 6076 return; 6077 } 6078 6079 // Check for self-references within variable initializers. 6080 // Variables declared within a function/method body are handled 6081 // by a dataflow analysis. 6082 if (!VDecl->hasLocalStorage() && !VDecl->isStaticLocal()) 6083 CheckSelfReference(RealDecl, Init); 6084 6085 ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init); 6086 6087 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6088 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6089 Expr *DeduceInit = Init; 6090 // Initializer could be a C++ direct-initializer. Deduction only works if it 6091 // contains exactly one expression. 6092 if (CXXDirectInit) { 6093 if (CXXDirectInit->getNumExprs() == 0) { 6094 // It isn't possible to write this directly, but it is possible to 6095 // end up in this situation with "auto x(some_pack...);" 6096 Diag(CXXDirectInit->getLocStart(), 6097 diag::err_auto_var_init_no_expression) 6098 << VDecl->getDeclName() << VDecl->getType() 6099 << VDecl->getSourceRange(); 6100 RealDecl->setInvalidDecl(); 6101 return; 6102 } else if (CXXDirectInit->getNumExprs() > 1) { 6103 Diag(CXXDirectInit->getExpr(1)->getLocStart(), 6104 diag::err_auto_var_init_multiple_expressions) 6105 << VDecl->getDeclName() << VDecl->getType() 6106 << VDecl->getSourceRange(); 6107 RealDecl->setInvalidDecl(); 6108 return; 6109 } else { 6110 DeduceInit = CXXDirectInit->getExpr(0); 6111 } 6112 } 6113 TypeSourceInfo *DeducedType = 0; 6114 if (DeduceAutoType(VDecl->getTypeSourceInfo(), DeduceInit, DeducedType) == 6115 DAR_Failed) 6116 DiagnoseAutoDeductionFailure(VDecl, DeduceInit); 6117 if (!DeducedType) { 6118 RealDecl->setInvalidDecl(); 6119 return; 6120 } 6121 VDecl->setTypeSourceInfo(DeducedType); 6122 VDecl->setType(DeducedType->getType()); 6123 VDecl->ClearLinkageCache(); 6124 6125 // In ARC, infer lifetime. 6126 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 6127 VDecl->setInvalidDecl(); 6128 6129 // If this is a redeclaration, check that the type we just deduced matches 6130 // the previously declared type. 6131 if (VarDecl *Old = VDecl->getPreviousDecl()) 6132 MergeVarDeclTypes(VDecl, Old); 6133 } 6134 6135 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 6136 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 6137 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6138 VDecl->setInvalidDecl(); 6139 return; 6140 } 6141 6142 if (!VDecl->getType()->isDependentType()) { 6143 // A definition must end up with a complete type, which means it must be 6144 // complete with the restriction that an array type might be completed by 6145 // the initializer; note that later code assumes this restriction. 6146 QualType BaseDeclType = VDecl->getType(); 6147 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 6148 BaseDeclType = Array->getElementType(); 6149 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 6150 diag::err_typecheck_decl_incomplete_type)) { 6151 RealDecl->setInvalidDecl(); 6152 return; 6153 } 6154 6155 // The variable can not have an abstract class type. 6156 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6157 diag::err_abstract_type_in_decl, 6158 AbstractVariableType)) 6159 VDecl->setInvalidDecl(); 6160 } 6161 6162 const VarDecl *Def; 6163 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6164 Diag(VDecl->getLocation(), diag::err_redefinition) 6165 << VDecl->getDeclName(); 6166 Diag(Def->getLocation(), diag::note_previous_definition); 6167 VDecl->setInvalidDecl(); 6168 return; 6169 } 6170 6171 const VarDecl* PrevInit = 0; 6172 if (getLangOptions().CPlusPlus) { 6173 // C++ [class.static.data]p4 6174 // If a static data member is of const integral or const 6175 // enumeration type, its declaration in the class definition can 6176 // specify a constant-initializer which shall be an integral 6177 // constant expression (5.19). In that case, the member can appear 6178 // in integral constant expressions. The member shall still be 6179 // defined in a namespace scope if it is used in the program and the 6180 // namespace scope definition shall not contain an initializer. 6181 // 6182 // We already performed a redefinition check above, but for static 6183 // data members we also need to check whether there was an in-class 6184 // declaration with an initializer. 6185 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6186 Diag(VDecl->getLocation(), diag::err_redefinition) 6187 << VDecl->getDeclName(); 6188 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6189 return; 6190 } 6191 6192 if (VDecl->hasLocalStorage()) 6193 getCurFunction()->setHasBranchProtectedScope(); 6194 6195 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6196 VDecl->setInvalidDecl(); 6197 return; 6198 } 6199 } 6200 6201 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6202 // a kernel function cannot be initialized." 6203 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6204 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6205 VDecl->setInvalidDecl(); 6206 return; 6207 } 6208 6209 // Get the decls type and save a reference for later, since 6210 // CheckInitializerTypes may change it. 6211 QualType DclT = VDecl->getType(), SavT = DclT; 6212 6213 // Top-level message sends default to 'id' when we're in a debugger 6214 // and we are assigning it to a variable of 'id' type. 6215 if (getLangOptions().DebuggerCastResultToId && DclT->isObjCIdType()) 6216 if (Init->getType() == Context.UnknownAnyTy && isa<ObjCMessageExpr>(Init)) { 6217 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType()); 6218 if (Result.isInvalid()) { 6219 VDecl->setInvalidDecl(); 6220 return; 6221 } 6222 Init = Result.take(); 6223 } 6224 6225 // Perform the initialization. 6226 if (!VDecl->isInvalidDecl()) { 6227 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6228 InitializationKind Kind 6229 = DirectInit ? 6230 CXXDirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6231 Init->getLocStart(), 6232 Init->getLocEnd()) 6233 : InitializationKind::CreateDirectList( 6234 VDecl->getLocation()) 6235 : InitializationKind::CreateCopy(VDecl->getLocation(), 6236 Init->getLocStart()); 6237 6238 Expr **Args = &Init; 6239 unsigned NumArgs = 1; 6240 if (CXXDirectInit) { 6241 Args = CXXDirectInit->getExprs(); 6242 NumArgs = CXXDirectInit->getNumExprs(); 6243 } 6244 InitializationSequence InitSeq(*this, Entity, Kind, Args, NumArgs); 6245 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6246 MultiExprArg(*this, Args,NumArgs), 6247 &DclT); 6248 if (Result.isInvalid()) { 6249 VDecl->setInvalidDecl(); 6250 return; 6251 } 6252 6253 Init = Result.takeAs<Expr>(); 6254 } 6255 6256 // If the type changed, it means we had an incomplete type that was 6257 // completed by the initializer. For example: 6258 // int ary[] = { 1, 3, 5 }; 6259 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6260 if (!VDecl->isInvalidDecl() && (DclT != SavT)) 6261 VDecl->setType(DclT); 6262 6263 // Check any implicit conversions within the expression. 6264 CheckImplicitConversions(Init, VDecl->getLocation()); 6265 6266 if (!VDecl->isInvalidDecl()) 6267 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6268 6269 Init = MaybeCreateExprWithCleanups(Init); 6270 // Attach the initializer to the decl. 6271 VDecl->setInit(Init); 6272 6273 if (VDecl->isLocalVarDecl()) { 6274 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6275 // static storage duration shall be constant expressions or string literals. 6276 // C++ does not have this restriction. 6277 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl() && 6278 VDecl->getStorageClass() == SC_Static) 6279 CheckForConstantInitializer(Init, DclT); 6280 } else if (VDecl->isStaticDataMember() && 6281 VDecl->getLexicalDeclContext()->isRecord()) { 6282 // This is an in-class initialization for a static data member, e.g., 6283 // 6284 // struct S { 6285 // static const int value = 17; 6286 // }; 6287 6288 // C++ [class.mem]p4: 6289 // A member-declarator can contain a constant-initializer only 6290 // if it declares a static member (9.4) of const integral or 6291 // const enumeration type, see 9.4.2. 6292 // 6293 // C++11 [class.static.data]p3: 6294 // If a non-volatile const static data member is of integral or 6295 // enumeration type, its declaration in the class definition can 6296 // specify a brace-or-equal-initializer in which every initalizer-clause 6297 // that is an assignment-expression is a constant expression. A static 6298 // data member of literal type can be declared in the class definition 6299 // with the constexpr specifier; if so, its declaration shall specify a 6300 // brace-or-equal-initializer in which every initializer-clause that is 6301 // an assignment-expression is a constant expression. 6302 6303 // Do nothing on dependent types. 6304 if (DclT->isDependentType()) { 6305 6306 // Allow any 'static constexpr' members, whether or not they are of literal 6307 // type. We separately check that every constexpr variable is of literal 6308 // type. 6309 } else if (VDecl->isConstexpr()) { 6310 6311 // Require constness. 6312 } else if (!DclT.isConstQualified()) { 6313 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6314 << Init->getSourceRange(); 6315 VDecl->setInvalidDecl(); 6316 6317 // We allow integer constant expressions in all cases. 6318 } else if (DclT->isIntegralOrEnumerationType()) { 6319 // Check whether the expression is a constant expression. 6320 SourceLocation Loc; 6321 if (getLangOptions().CPlusPlus0x && DclT.isVolatileQualified()) 6322 // In C++11, a non-constexpr const static data member with an 6323 // in-class initializer cannot be volatile. 6324 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6325 else if (Init->isValueDependent()) 6326 ; // Nothing to check. 6327 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6328 ; // Ok, it's an ICE! 6329 else if (Init->isEvaluatable(Context)) { 6330 // If we can constant fold the initializer through heroics, accept it, 6331 // but report this as a use of an extension for -pedantic. 6332 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6333 << Init->getSourceRange(); 6334 } else { 6335 // Otherwise, this is some crazy unknown case. Report the issue at the 6336 // location provided by the isIntegerConstantExpr failed check. 6337 Diag(Loc, diag::err_in_class_initializer_non_constant) 6338 << Init->getSourceRange(); 6339 VDecl->setInvalidDecl(); 6340 } 6341 6342 // We allow foldable floating-point constants as an extension. 6343 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6344 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6345 << DclT << Init->getSourceRange(); 6346 if (getLangOptions().CPlusPlus0x) 6347 Diag(VDecl->getLocation(), 6348 diag::note_in_class_initializer_float_type_constexpr) 6349 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6350 6351 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6352 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6353 << Init->getSourceRange(); 6354 VDecl->setInvalidDecl(); 6355 } 6356 6357 // Suggest adding 'constexpr' in C++11 for literal types. 6358 } else if (getLangOptions().CPlusPlus0x && DclT->isLiteralType()) { 6359 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6360 << DclT << Init->getSourceRange() 6361 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6362 VDecl->setConstexpr(true); 6363 6364 } else { 6365 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6366 << DclT << Init->getSourceRange(); 6367 VDecl->setInvalidDecl(); 6368 } 6369 } else if (VDecl->isFileVarDecl()) { 6370 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6371 (!getLangOptions().CPlusPlus || 6372 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6373 Diag(VDecl->getLocation(), diag::warn_extern_init); 6374 6375 // C99 6.7.8p4. All file scoped initializers need to be constant. 6376 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) 6377 CheckForConstantInitializer(Init, DclT); 6378 } 6379 6380 // We will represent direct-initialization similarly to copy-initialization: 6381 // int x(1); -as-> int x = 1; 6382 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 6383 // 6384 // Clients that want to distinguish between the two forms, can check for 6385 // direct initializer using VarDecl::getInitStyle(). 6386 // A major benefit is that clients that don't particularly care about which 6387 // exactly form was it (like the CodeGen) can handle both cases without 6388 // special case code. 6389 6390 // C++ 8.5p11: 6391 // The form of initialization (using parentheses or '=') is generally 6392 // insignificant, but does matter when the entity being initialized has a 6393 // class type. 6394 if (CXXDirectInit) { 6395 assert(DirectInit && "Call-style initializer must be direct init."); 6396 VDecl->setInitStyle(VarDecl::CallInit); 6397 } else if (DirectInit) { 6398 // This must be list-initialization. No other way is direct-initialization. 6399 VDecl->setInitStyle(VarDecl::ListInit); 6400 } 6401 6402 CheckCompleteVariableDeclaration(VDecl); 6403} 6404 6405/// ActOnInitializerError - Given that there was an error parsing an 6406/// initializer for the given declaration, try to return to some form 6407/// of sanity. 6408void Sema::ActOnInitializerError(Decl *D) { 6409 // Our main concern here is re-establishing invariants like "a 6410 // variable's type is either dependent or complete". 6411 if (!D || D->isInvalidDecl()) return; 6412 6413 VarDecl *VD = dyn_cast<VarDecl>(D); 6414 if (!VD) return; 6415 6416 // Auto types are meaningless if we can't make sense of the initializer. 6417 if (ParsingInitForAutoVars.count(D)) { 6418 D->setInvalidDecl(); 6419 return; 6420 } 6421 6422 QualType Ty = VD->getType(); 6423 if (Ty->isDependentType()) return; 6424 6425 // Require a complete type. 6426 if (RequireCompleteType(VD->getLocation(), 6427 Context.getBaseElementType(Ty), 6428 diag::err_typecheck_decl_incomplete_type)) { 6429 VD->setInvalidDecl(); 6430 return; 6431 } 6432 6433 // Require an abstract type. 6434 if (RequireNonAbstractType(VD->getLocation(), Ty, 6435 diag::err_abstract_type_in_decl, 6436 AbstractVariableType)) { 6437 VD->setInvalidDecl(); 6438 return; 6439 } 6440 6441 // Don't bother complaining about constructors or destructors, 6442 // though. 6443} 6444 6445void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6446 bool TypeMayContainAuto) { 6447 // If there is no declaration, there was an error parsing it. Just ignore it. 6448 if (RealDecl == 0) 6449 return; 6450 6451 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6452 QualType Type = Var->getType(); 6453 6454 // C++11 [dcl.spec.auto]p3 6455 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6456 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6457 << Var->getDeclName() << Type; 6458 Var->setInvalidDecl(); 6459 return; 6460 } 6461 6462 // C++11 [class.static.data]p3: A static data member can be declared with 6463 // the constexpr specifier; if so, its declaration shall specify 6464 // a brace-or-equal-initializer. 6465 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6466 // the definition of a variable [...] or the declaration of a static data 6467 // member. 6468 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6469 if (Var->isStaticDataMember()) 6470 Diag(Var->getLocation(), 6471 diag::err_constexpr_static_mem_var_requires_init) 6472 << Var->getDeclName(); 6473 else 6474 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6475 Var->setInvalidDecl(); 6476 return; 6477 } 6478 6479 switch (Var->isThisDeclarationADefinition()) { 6480 case VarDecl::Definition: 6481 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6482 break; 6483 6484 // We have an out-of-line definition of a static data member 6485 // that has an in-class initializer, so we type-check this like 6486 // a declaration. 6487 // 6488 // Fall through 6489 6490 case VarDecl::DeclarationOnly: 6491 // It's only a declaration. 6492 6493 // Block scope. C99 6.7p7: If an identifier for an object is 6494 // declared with no linkage (C99 6.2.2p6), the type for the 6495 // object shall be complete. 6496 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6497 !Var->getLinkage() && !Var->isInvalidDecl() && 6498 RequireCompleteType(Var->getLocation(), Type, 6499 diag::err_typecheck_decl_incomplete_type)) 6500 Var->setInvalidDecl(); 6501 6502 // Make sure that the type is not abstract. 6503 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6504 RequireNonAbstractType(Var->getLocation(), Type, 6505 diag::err_abstract_type_in_decl, 6506 AbstractVariableType)) 6507 Var->setInvalidDecl(); 6508 return; 6509 6510 case VarDecl::TentativeDefinition: 6511 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6512 // object that has file scope without an initializer, and without a 6513 // storage-class specifier or with the storage-class specifier "static", 6514 // constitutes a tentative definition. Note: A tentative definition with 6515 // external linkage is valid (C99 6.2.2p5). 6516 if (!Var->isInvalidDecl()) { 6517 if (const IncompleteArrayType *ArrayT 6518 = Context.getAsIncompleteArrayType(Type)) { 6519 if (RequireCompleteType(Var->getLocation(), 6520 ArrayT->getElementType(), 6521 diag::err_illegal_decl_array_incomplete_type)) 6522 Var->setInvalidDecl(); 6523 } else if (Var->getStorageClass() == SC_Static) { 6524 // C99 6.9.2p3: If the declaration of an identifier for an object is 6525 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6526 // declared type shall not be an incomplete type. 6527 // NOTE: code such as the following 6528 // static struct s; 6529 // struct s { int a; }; 6530 // is accepted by gcc. Hence here we issue a warning instead of 6531 // an error and we do not invalidate the static declaration. 6532 // NOTE: to avoid multiple warnings, only check the first declaration. 6533 if (Var->getPreviousDecl() == 0) 6534 RequireCompleteType(Var->getLocation(), Type, 6535 diag::ext_typecheck_decl_incomplete_type); 6536 } 6537 } 6538 6539 // Record the tentative definition; we're done. 6540 if (!Var->isInvalidDecl()) 6541 TentativeDefinitions.push_back(Var); 6542 return; 6543 } 6544 6545 // Provide a specific diagnostic for uninitialized variable 6546 // definitions with incomplete array type. 6547 if (Type->isIncompleteArrayType()) { 6548 Diag(Var->getLocation(), 6549 diag::err_typecheck_incomplete_array_needs_initializer); 6550 Var->setInvalidDecl(); 6551 return; 6552 } 6553 6554 // Provide a specific diagnostic for uninitialized variable 6555 // definitions with reference type. 6556 if (Type->isReferenceType()) { 6557 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6558 << Var->getDeclName() 6559 << SourceRange(Var->getLocation(), Var->getLocation()); 6560 Var->setInvalidDecl(); 6561 return; 6562 } 6563 6564 // Do not attempt to type-check the default initializer for a 6565 // variable with dependent type. 6566 if (Type->isDependentType()) 6567 return; 6568 6569 if (Var->isInvalidDecl()) 6570 return; 6571 6572 if (RequireCompleteType(Var->getLocation(), 6573 Context.getBaseElementType(Type), 6574 diag::err_typecheck_decl_incomplete_type)) { 6575 Var->setInvalidDecl(); 6576 return; 6577 } 6578 6579 // The variable can not have an abstract class type. 6580 if (RequireNonAbstractType(Var->getLocation(), Type, 6581 diag::err_abstract_type_in_decl, 6582 AbstractVariableType)) { 6583 Var->setInvalidDecl(); 6584 return; 6585 } 6586 6587 // Check for jumps past the implicit initializer. C++0x 6588 // clarifies that this applies to a "variable with automatic 6589 // storage duration", not a "local variable". 6590 // C++11 [stmt.dcl]p3 6591 // A program that jumps from a point where a variable with automatic 6592 // storage duration is not in scope to a point where it is in scope is 6593 // ill-formed unless the variable has scalar type, class type with a 6594 // trivial default constructor and a trivial destructor, a cv-qualified 6595 // version of one of these types, or an array of one of the preceding 6596 // types and is declared without an initializer. 6597 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6598 if (const RecordType *Record 6599 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6600 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6601 // Mark the function for further checking even if the looser rules of 6602 // C++11 do not require such checks, so that we can diagnose 6603 // incompatibilities with C++98. 6604 if (!CXXRecord->isPOD()) 6605 getCurFunction()->setHasBranchProtectedScope(); 6606 } 6607 } 6608 6609 // C++03 [dcl.init]p9: 6610 // If no initializer is specified for an object, and the 6611 // object is of (possibly cv-qualified) non-POD class type (or 6612 // array thereof), the object shall be default-initialized; if 6613 // the object is of const-qualified type, the underlying class 6614 // type shall have a user-declared default 6615 // constructor. Otherwise, if no initializer is specified for 6616 // a non- static object, the object and its subobjects, if 6617 // any, have an indeterminate initial value); if the object 6618 // or any of its subobjects are of const-qualified type, the 6619 // program is ill-formed. 6620 // C++0x [dcl.init]p11: 6621 // If no initializer is specified for an object, the object is 6622 // default-initialized; [...]. 6623 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6624 InitializationKind Kind 6625 = InitializationKind::CreateDefault(Var->getLocation()); 6626 6627 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6628 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6629 MultiExprArg(*this, 0, 0)); 6630 if (Init.isInvalid()) 6631 Var->setInvalidDecl(); 6632 else if (Init.get()) { 6633 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6634 // This is important for template substitution. 6635 Var->setInitStyle(VarDecl::CallInit); 6636 } 6637 6638 CheckCompleteVariableDeclaration(Var); 6639 } 6640} 6641 6642void Sema::ActOnCXXForRangeDecl(Decl *D) { 6643 VarDecl *VD = dyn_cast<VarDecl>(D); 6644 if (!VD) { 6645 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6646 D->setInvalidDecl(); 6647 return; 6648 } 6649 6650 VD->setCXXForRangeDecl(true); 6651 6652 // for-range-declaration cannot be given a storage class specifier. 6653 int Error = -1; 6654 switch (VD->getStorageClassAsWritten()) { 6655 case SC_None: 6656 break; 6657 case SC_Extern: 6658 Error = 0; 6659 break; 6660 case SC_Static: 6661 Error = 1; 6662 break; 6663 case SC_PrivateExtern: 6664 Error = 2; 6665 break; 6666 case SC_Auto: 6667 Error = 3; 6668 break; 6669 case SC_Register: 6670 Error = 4; 6671 break; 6672 case SC_OpenCLWorkGroupLocal: 6673 llvm_unreachable("Unexpected storage class"); 6674 } 6675 if (VD->isConstexpr()) 6676 Error = 5; 6677 if (Error != -1) { 6678 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6679 << VD->getDeclName() << Error; 6680 D->setInvalidDecl(); 6681 } 6682} 6683 6684void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6685 if (var->isInvalidDecl()) return; 6686 6687 // In ARC, don't allow jumps past the implicit initialization of a 6688 // local retaining variable. 6689 if (getLangOptions().ObjCAutoRefCount && 6690 var->hasLocalStorage()) { 6691 switch (var->getType().getObjCLifetime()) { 6692 case Qualifiers::OCL_None: 6693 case Qualifiers::OCL_ExplicitNone: 6694 case Qualifiers::OCL_Autoreleasing: 6695 break; 6696 6697 case Qualifiers::OCL_Weak: 6698 case Qualifiers::OCL_Strong: 6699 getCurFunction()->setHasBranchProtectedScope(); 6700 break; 6701 } 6702 } 6703 6704 // All the following checks are C++ only. 6705 if (!getLangOptions().CPlusPlus) return; 6706 6707 QualType baseType = Context.getBaseElementType(var->getType()); 6708 if (baseType->isDependentType()) return; 6709 6710 // __block variables might require us to capture a copy-initializer. 6711 if (var->hasAttr<BlocksAttr>()) { 6712 // It's currently invalid to ever have a __block variable with an 6713 // array type; should we diagnose that here? 6714 6715 // Regardless, we don't want to ignore array nesting when 6716 // constructing this copy. 6717 QualType type = var->getType(); 6718 6719 if (type->isStructureOrClassType()) { 6720 SourceLocation poi = var->getLocation(); 6721 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6722 ExprResult result = 6723 PerformCopyInitialization( 6724 InitializedEntity::InitializeBlock(poi, type, false), 6725 poi, Owned(varRef)); 6726 if (!result.isInvalid()) { 6727 result = MaybeCreateExprWithCleanups(result); 6728 Expr *init = result.takeAs<Expr>(); 6729 Context.setBlockVarCopyInits(var, init); 6730 } 6731 } 6732 } 6733 6734 Expr *Init = var->getInit(); 6735 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6736 6737 if (!var->getDeclContext()->isDependentContext() && Init) { 6738 if (IsGlobal && !var->isConstexpr() && 6739 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6740 var->getLocation()) 6741 != DiagnosticsEngine::Ignored && 6742 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 6743 Diag(var->getLocation(), diag::warn_global_constructor) 6744 << Init->getSourceRange(); 6745 6746 if (var->isConstexpr()) { 6747 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 6748 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 6749 SourceLocation DiagLoc = var->getLocation(); 6750 // If the note doesn't add any useful information other than a source 6751 // location, fold it into the primary diagnostic. 6752 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 6753 diag::note_invalid_subexpr_in_const_expr) { 6754 DiagLoc = Notes[0].first; 6755 Notes.clear(); 6756 } 6757 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 6758 << var << Init->getSourceRange(); 6759 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 6760 Diag(Notes[I].first, Notes[I].second); 6761 } 6762 } else if (var->isUsableInConstantExpressions(Context)) { 6763 // Check whether the initializer of a const variable of integral or 6764 // enumeration type is an ICE now, since we can't tell whether it was 6765 // initialized by a constant expression if we check later. 6766 var->checkInitIsICE(); 6767 } 6768 } 6769 6770 // Require the destructor. 6771 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6772 FinalizeVarWithDestructor(var, recordType); 6773} 6774 6775/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6776/// any semantic actions necessary after any initializer has been attached. 6777void 6778Sema::FinalizeDeclaration(Decl *ThisDecl) { 6779 // Note that we are no longer parsing the initializer for this declaration. 6780 ParsingInitForAutoVars.erase(ThisDecl); 6781} 6782 6783Sema::DeclGroupPtrTy 6784Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6785 Decl **Group, unsigned NumDecls) { 6786 SmallVector<Decl*, 8> Decls; 6787 6788 if (DS.isTypeSpecOwned()) 6789 Decls.push_back(DS.getRepAsDecl()); 6790 6791 for (unsigned i = 0; i != NumDecls; ++i) 6792 if (Decl *D = Group[i]) 6793 Decls.push_back(D); 6794 6795 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6796 DS.getTypeSpecType() == DeclSpec::TST_auto); 6797} 6798 6799/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6800/// group, performing any necessary semantic checking. 6801Sema::DeclGroupPtrTy 6802Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6803 bool TypeMayContainAuto) { 6804 // C++0x [dcl.spec.auto]p7: 6805 // If the type deduced for the template parameter U is not the same in each 6806 // deduction, the program is ill-formed. 6807 // FIXME: When initializer-list support is added, a distinction is needed 6808 // between the deduced type U and the deduced type which 'auto' stands for. 6809 // auto a = 0, b = { 1, 2, 3 }; 6810 // is legal because the deduced type U is 'int' in both cases. 6811 if (TypeMayContainAuto && NumDecls > 1) { 6812 QualType Deduced; 6813 CanQualType DeducedCanon; 6814 VarDecl *DeducedDecl = 0; 6815 for (unsigned i = 0; i != NumDecls; ++i) { 6816 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6817 AutoType *AT = D->getType()->getContainedAutoType(); 6818 // Don't reissue diagnostics when instantiating a template. 6819 if (AT && D->isInvalidDecl()) 6820 break; 6821 if (AT && AT->isDeduced()) { 6822 QualType U = AT->getDeducedType(); 6823 CanQualType UCanon = Context.getCanonicalType(U); 6824 if (Deduced.isNull()) { 6825 Deduced = U; 6826 DeducedCanon = UCanon; 6827 DeducedDecl = D; 6828 } else if (DeducedCanon != UCanon) { 6829 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6830 diag::err_auto_different_deductions) 6831 << Deduced << DeducedDecl->getDeclName() 6832 << U << D->getDeclName() 6833 << DeducedDecl->getInit()->getSourceRange() 6834 << D->getInit()->getSourceRange(); 6835 D->setInvalidDecl(); 6836 break; 6837 } 6838 } 6839 } 6840 } 6841 } 6842 6843 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6844} 6845 6846 6847/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6848/// to introduce parameters into function prototype scope. 6849Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6850 const DeclSpec &DS = D.getDeclSpec(); 6851 6852 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6853 // C++03 [dcl.stc]p2 also permits 'auto'. 6854 VarDecl::StorageClass StorageClass = SC_None; 6855 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6856 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6857 StorageClass = SC_Register; 6858 StorageClassAsWritten = SC_Register; 6859 } else if (getLangOptions().CPlusPlus && 6860 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6861 StorageClass = SC_Auto; 6862 StorageClassAsWritten = SC_Auto; 6863 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6864 Diag(DS.getStorageClassSpecLoc(), 6865 diag::err_invalid_storage_class_in_func_decl); 6866 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6867 } 6868 6869 if (D.getDeclSpec().isThreadSpecified()) 6870 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6871 if (D.getDeclSpec().isConstexprSpecified()) 6872 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6873 << 0; 6874 6875 DiagnoseFunctionSpecifiers(D); 6876 6877 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6878 QualType parmDeclType = TInfo->getType(); 6879 6880 if (getLangOptions().CPlusPlus) { 6881 // Check that there are no default arguments inside the type of this 6882 // parameter. 6883 CheckExtraCXXDefaultArguments(D); 6884 6885 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6886 if (D.getCXXScopeSpec().isSet()) { 6887 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6888 << D.getCXXScopeSpec().getRange(); 6889 D.getCXXScopeSpec().clear(); 6890 } 6891 } 6892 6893 // Ensure we have a valid name 6894 IdentifierInfo *II = 0; 6895 if (D.hasName()) { 6896 II = D.getIdentifier(); 6897 if (!II) { 6898 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6899 << GetNameForDeclarator(D).getName().getAsString(); 6900 D.setInvalidType(true); 6901 } 6902 } 6903 6904 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6905 if (II) { 6906 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6907 ForRedeclaration); 6908 LookupName(R, S); 6909 if (R.isSingleResult()) { 6910 NamedDecl *PrevDecl = R.getFoundDecl(); 6911 if (PrevDecl->isTemplateParameter()) { 6912 // Maybe we will complain about the shadowed template parameter. 6913 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6914 // Just pretend that we didn't see the previous declaration. 6915 PrevDecl = 0; 6916 } else if (S->isDeclScope(PrevDecl)) { 6917 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6918 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6919 6920 // Recover by removing the name 6921 II = 0; 6922 D.SetIdentifier(0, D.getIdentifierLoc()); 6923 D.setInvalidType(true); 6924 } 6925 } 6926 } 6927 6928 // Temporarily put parameter variables in the translation unit, not 6929 // the enclosing context. This prevents them from accidentally 6930 // looking like class members in C++. 6931 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6932 D.getLocStart(), 6933 D.getIdentifierLoc(), II, 6934 parmDeclType, TInfo, 6935 StorageClass, StorageClassAsWritten); 6936 6937 if (D.isInvalidType()) 6938 New->setInvalidDecl(); 6939 6940 assert(S->isFunctionPrototypeScope()); 6941 assert(S->getFunctionPrototypeDepth() >= 1); 6942 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6943 S->getNextFunctionPrototypeIndex()); 6944 6945 // Add the parameter declaration into this scope. 6946 S->AddDecl(New); 6947 if (II) 6948 IdResolver.AddDecl(New); 6949 6950 ProcessDeclAttributes(S, New, D); 6951 6952 if (D.getDeclSpec().isModulePrivateSpecified()) 6953 Diag(New->getLocation(), diag::err_module_private_local) 6954 << 1 << New->getDeclName() 6955 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6956 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6957 6958 if (New->hasAttr<BlocksAttr>()) { 6959 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6960 } 6961 return New; 6962} 6963 6964/// \brief Synthesizes a variable for a parameter arising from a 6965/// typedef. 6966ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6967 SourceLocation Loc, 6968 QualType T) { 6969 /* FIXME: setting StartLoc == Loc. 6970 Would it be worth to modify callers so as to provide proper source 6971 location for the unnamed parameters, embedding the parameter's type? */ 6972 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6973 T, Context.getTrivialTypeSourceInfo(T, Loc), 6974 SC_None, SC_None, 0); 6975 Param->setImplicit(); 6976 return Param; 6977} 6978 6979void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6980 ParmVarDecl * const *ParamEnd) { 6981 // Don't diagnose unused-parameter errors in template instantiations; we 6982 // will already have done so in the template itself. 6983 if (!ActiveTemplateInstantiations.empty()) 6984 return; 6985 6986 for (; Param != ParamEnd; ++Param) { 6987 if (!(*Param)->isReferenced() && (*Param)->getDeclName() && 6988 !(*Param)->hasAttr<UnusedAttr>()) { 6989 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6990 << (*Param)->getDeclName(); 6991 } 6992 } 6993} 6994 6995void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6996 ParmVarDecl * const *ParamEnd, 6997 QualType ReturnTy, 6998 NamedDecl *D) { 6999 if (LangOpts.NumLargeByValueCopy == 0) // No check. 7000 return; 7001 7002 // Warn if the return value is pass-by-value and larger than the specified 7003 // threshold. 7004 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 7005 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 7006 if (Size > LangOpts.NumLargeByValueCopy) 7007 Diag(D->getLocation(), diag::warn_return_value_size) 7008 << D->getDeclName() << Size; 7009 } 7010 7011 // Warn if any parameter is pass-by-value and larger than the specified 7012 // threshold. 7013 for (; Param != ParamEnd; ++Param) { 7014 QualType T = (*Param)->getType(); 7015 if (T->isDependentType() || !T.isPODType(Context)) 7016 continue; 7017 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 7018 if (Size > LangOpts.NumLargeByValueCopy) 7019 Diag((*Param)->getLocation(), diag::warn_parameter_size) 7020 << (*Param)->getDeclName() << Size; 7021 } 7022} 7023 7024ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 7025 SourceLocation NameLoc, IdentifierInfo *Name, 7026 QualType T, TypeSourceInfo *TSInfo, 7027 VarDecl::StorageClass StorageClass, 7028 VarDecl::StorageClass StorageClassAsWritten) { 7029 // In ARC, infer a lifetime qualifier for appropriate parameter types. 7030 if (getLangOptions().ObjCAutoRefCount && 7031 T.getObjCLifetime() == Qualifiers::OCL_None && 7032 T->isObjCLifetimeType()) { 7033 7034 Qualifiers::ObjCLifetime lifetime; 7035 7036 // Special cases for arrays: 7037 // - if it's const, use __unsafe_unretained 7038 // - otherwise, it's an error 7039 if (T->isArrayType()) { 7040 if (!T.isConstQualified()) { 7041 DelayedDiagnostics.add( 7042 sema::DelayedDiagnostic::makeForbiddenType( 7043 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 7044 } 7045 lifetime = Qualifiers::OCL_ExplicitNone; 7046 } else { 7047 lifetime = T->getObjCARCImplicitLifetime(); 7048 } 7049 T = Context.getLifetimeQualifiedType(T, lifetime); 7050 } 7051 7052 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 7053 Context.getAdjustedParameterType(T), 7054 TSInfo, 7055 StorageClass, StorageClassAsWritten, 7056 0); 7057 7058 // Parameters can not be abstract class types. 7059 // For record types, this is done by the AbstractClassUsageDiagnoser once 7060 // the class has been completely parsed. 7061 if (!CurContext->isRecord() && 7062 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 7063 AbstractParamType)) 7064 New->setInvalidDecl(); 7065 7066 // Parameter declarators cannot be interface types. All ObjC objects are 7067 // passed by reference. 7068 if (T->isObjCObjectType()) { 7069 Diag(NameLoc, 7070 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 7071 << FixItHint::CreateInsertion(NameLoc, "*"); 7072 T = Context.getObjCObjectPointerType(T); 7073 New->setType(T); 7074 } 7075 7076 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 7077 // duration shall not be qualified by an address-space qualifier." 7078 // Since all parameters have automatic store duration, they can not have 7079 // an address space. 7080 if (T.getAddressSpace() != 0) { 7081 Diag(NameLoc, diag::err_arg_with_address_space); 7082 New->setInvalidDecl(); 7083 } 7084 7085 return New; 7086} 7087 7088void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 7089 SourceLocation LocAfterDecls) { 7090 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 7091 7092 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 7093 // for a K&R function. 7094 if (!FTI.hasPrototype) { 7095 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 7096 --i; 7097 if (FTI.ArgInfo[i].Param == 0) { 7098 SmallString<256> Code; 7099 llvm::raw_svector_ostream(Code) << " int " 7100 << FTI.ArgInfo[i].Ident->getName() 7101 << ";\n"; 7102 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 7103 << FTI.ArgInfo[i].Ident 7104 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 7105 7106 // Implicitly declare the argument as type 'int' for lack of a better 7107 // type. 7108 AttributeFactory attrs; 7109 DeclSpec DS(attrs); 7110 const char* PrevSpec; // unused 7111 unsigned DiagID; // unused 7112 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 7113 PrevSpec, DiagID); 7114 Declarator ParamD(DS, Declarator::KNRTypeListContext); 7115 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 7116 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 7117 } 7118 } 7119 } 7120} 7121 7122Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 7123 Declarator &D) { 7124 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 7125 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 7126 Scope *ParentScope = FnBodyScope->getParent(); 7127 7128 D.setFunctionDefinitionKind(FDK_Definition); 7129 Decl *DP = HandleDeclarator(ParentScope, D, 7130 MultiTemplateParamsArg(*this)); 7131 return ActOnStartOfFunctionDef(FnBodyScope, DP); 7132} 7133 7134static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 7135 // Don't warn about invalid declarations. 7136 if (FD->isInvalidDecl()) 7137 return false; 7138 7139 // Or declarations that aren't global. 7140 if (!FD->isGlobal()) 7141 return false; 7142 7143 // Don't warn about C++ member functions. 7144 if (isa<CXXMethodDecl>(FD)) 7145 return false; 7146 7147 // Don't warn about 'main'. 7148 if (FD->isMain()) 7149 return false; 7150 7151 // Don't warn about inline functions. 7152 if (FD->isInlined()) 7153 return false; 7154 7155 // Don't warn about function templates. 7156 if (FD->getDescribedFunctionTemplate()) 7157 return false; 7158 7159 // Don't warn about function template specializations. 7160 if (FD->isFunctionTemplateSpecialization()) 7161 return false; 7162 7163 bool MissingPrototype = true; 7164 for (const FunctionDecl *Prev = FD->getPreviousDecl(); 7165 Prev; Prev = Prev->getPreviousDecl()) { 7166 // Ignore any declarations that occur in function or method 7167 // scope, because they aren't visible from the header. 7168 if (Prev->getDeclContext()->isFunctionOrMethod()) 7169 continue; 7170 7171 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 7172 break; 7173 } 7174 7175 return MissingPrototype; 7176} 7177 7178void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 7179 // Don't complain if we're in GNU89 mode and the previous definition 7180 // was an extern inline function. 7181 const FunctionDecl *Definition; 7182 if (FD->isDefined(Definition) && 7183 !canRedefineFunction(Definition, getLangOptions())) { 7184 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 7185 Definition->getStorageClass() == SC_Extern) 7186 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 7187 << FD->getDeclName() << getLangOptions().CPlusPlus; 7188 else 7189 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 7190 Diag(Definition->getLocation(), diag::note_previous_definition); 7191 } 7192} 7193 7194Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 7195 // Clear the last template instantiation error context. 7196 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 7197 7198 if (!D) 7199 return D; 7200 FunctionDecl *FD = 0; 7201 7202 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 7203 FD = FunTmpl->getTemplatedDecl(); 7204 else 7205 FD = cast<FunctionDecl>(D); 7206 7207 // Enter a new function scope 7208 PushFunctionScope(); 7209 7210 // See if this is a redefinition. 7211 if (!FD->isLateTemplateParsed()) 7212 CheckForFunctionRedefinition(FD); 7213 7214 // Builtin functions cannot be defined. 7215 if (unsigned BuiltinID = FD->getBuiltinID()) { 7216 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7217 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7218 FD->setInvalidDecl(); 7219 } 7220 } 7221 7222 // The return type of a function definition must be complete 7223 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7224 QualType ResultType = FD->getResultType(); 7225 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7226 !FD->isInvalidDecl() && 7227 RequireCompleteType(FD->getLocation(), ResultType, 7228 diag::err_func_def_incomplete_result)) 7229 FD->setInvalidDecl(); 7230 7231 // GNU warning -Wmissing-prototypes: 7232 // Warn if a global function is defined without a previous 7233 // prototype declaration. This warning is issued even if the 7234 // definition itself provides a prototype. The aim is to detect 7235 // global functions that fail to be declared in header files. 7236 if (ShouldWarnAboutMissingPrototype(FD)) 7237 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7238 7239 if (FnBodyScope) 7240 PushDeclContext(FnBodyScope, FD); 7241 7242 // Check the validity of our function parameters 7243 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7244 /*CheckParameterNames=*/true); 7245 7246 // Introduce our parameters into the function scope 7247 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7248 ParmVarDecl *Param = FD->getParamDecl(p); 7249 Param->setOwningFunction(FD); 7250 7251 // If this has an identifier, add it to the scope stack. 7252 if (Param->getIdentifier() && FnBodyScope) { 7253 CheckShadow(FnBodyScope, Param); 7254 7255 PushOnScopeChains(Param, FnBodyScope); 7256 } 7257 } 7258 7259 // If we had any tags defined in the function prototype, 7260 // introduce them into the function scope. 7261 if (FnBodyScope) { 7262 for (llvm::ArrayRef<NamedDecl*>::iterator I = FD->getDeclsInPrototypeScope().begin(), 7263 E = FD->getDeclsInPrototypeScope().end(); I != E; ++I) { 7264 NamedDecl *D = *I; 7265 7266 // Some of these decls (like enums) may have been pinned to the translation unit 7267 // for lack of a real context earlier. If so, remove from the translation unit 7268 // and reattach to the current context. 7269 if (D->getLexicalDeclContext() == Context.getTranslationUnitDecl()) { 7270 // Is the decl actually in the context? 7271 for (DeclContext::decl_iterator DI = Context.getTranslationUnitDecl()->decls_begin(), 7272 DE = Context.getTranslationUnitDecl()->decls_end(); DI != DE; ++DI) { 7273 if (*DI == D) { 7274 Context.getTranslationUnitDecl()->removeDecl(D); 7275 break; 7276 } 7277 } 7278 // Either way, reassign the lexical decl context to our FunctionDecl. 7279 D->setLexicalDeclContext(CurContext); 7280 } 7281 7282 // If the decl has a non-null name, make accessible in the current scope. 7283 if (!D->getName().empty()) 7284 PushOnScopeChains(D, FnBodyScope, /*AddToContext=*/false); 7285 7286 // Similarly, dive into enums and fish their constants out, making them 7287 // accessible in this scope. 7288 if (EnumDecl *ED = dyn_cast<EnumDecl>(D)) { 7289 for (EnumDecl::enumerator_iterator EI = ED->enumerator_begin(), 7290 EE = ED->enumerator_end(); EI != EE; ++EI) 7291 PushOnScopeChains(*EI, FnBodyScope, /*AddToContext=*/false); 7292 } 7293 } 7294 } 7295 7296 // Checking attributes of current function definition 7297 // dllimport attribute. 7298 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7299 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7300 // dllimport attribute cannot be directly applied to definition. 7301 // Microsoft accepts dllimport for functions defined within class scope. 7302 if (!DA->isInherited() && 7303 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7304 Diag(FD->getLocation(), 7305 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7306 << "dllimport"; 7307 FD->setInvalidDecl(); 7308 return FD; 7309 } 7310 7311 // Visual C++ appears to not think this is an issue, so only issue 7312 // a warning when Microsoft extensions are disabled. 7313 if (!LangOpts.MicrosoftExt) { 7314 // If a symbol previously declared dllimport is later defined, the 7315 // attribute is ignored in subsequent references, and a warning is 7316 // emitted. 7317 Diag(FD->getLocation(), 7318 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7319 << FD->getName() << "dllimport"; 7320 } 7321 } 7322 return FD; 7323} 7324 7325/// \brief Given the set of return statements within a function body, 7326/// compute the variables that are subject to the named return value 7327/// optimization. 7328/// 7329/// Each of the variables that is subject to the named return value 7330/// optimization will be marked as NRVO variables in the AST, and any 7331/// return statement that has a marked NRVO variable as its NRVO candidate can 7332/// use the named return value optimization. 7333/// 7334/// This function applies a very simplistic algorithm for NRVO: if every return 7335/// statement in the function has the same NRVO candidate, that candidate is 7336/// the NRVO variable. 7337/// 7338/// FIXME: Employ a smarter algorithm that accounts for multiple return 7339/// statements and the lifetimes of the NRVO candidates. We should be able to 7340/// find a maximal set of NRVO variables. 7341void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7342 ReturnStmt **Returns = Scope->Returns.data(); 7343 7344 const VarDecl *NRVOCandidate = 0; 7345 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7346 if (!Returns[I]->getNRVOCandidate()) 7347 return; 7348 7349 if (!NRVOCandidate) 7350 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7351 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7352 return; 7353 } 7354 7355 if (NRVOCandidate) 7356 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7357} 7358 7359Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7360 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7361} 7362 7363Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7364 bool IsInstantiation) { 7365 FunctionDecl *FD = 0; 7366 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7367 if (FunTmpl) 7368 FD = FunTmpl->getTemplatedDecl(); 7369 else 7370 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7371 7372 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7373 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7374 7375 if (FD) { 7376 FD->setBody(Body); 7377 7378 // If the function implicitly returns zero (like 'main') or is naked, 7379 // don't complain about missing return statements. 7380 if (FD->hasImplicitReturnZero() || FD->hasAttr<NakedAttr>()) 7381 WP.disableCheckFallThrough(); 7382 7383 // MSVC permits the use of pure specifier (=0) on function definition, 7384 // defined at class scope, warn about this non standard construct. 7385 if (getLangOptions().MicrosoftExt && FD->isPure()) 7386 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7387 7388 if (!FD->isInvalidDecl()) { 7389 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7390 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7391 FD->getResultType(), FD); 7392 7393 // If this is a constructor, we need a vtable. 7394 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7395 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7396 7397 computeNRVO(Body, getCurFunction()); 7398 } 7399 7400 assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) && 7401 "Function parsing confused"); 7402 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7403 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7404 MD->setBody(Body); 7405 if (Body) 7406 MD->setEndLoc(Body->getLocEnd()); 7407 if (!MD->isInvalidDecl()) { 7408 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7409 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7410 MD->getResultType(), MD); 7411 7412 if (Body) 7413 computeNRVO(Body, getCurFunction()); 7414 } 7415 if (ObjCShouldCallSuperDealloc) { 7416 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7417 ObjCShouldCallSuperDealloc = false; 7418 } 7419 if (ObjCShouldCallSuperFinalize) { 7420 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7421 ObjCShouldCallSuperFinalize = false; 7422 } 7423 } else { 7424 return 0; 7425 } 7426 7427 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7428 "ObjC methods, which should have been handled in the block above."); 7429 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7430 "ObjC methods, which should have been handled in the block above."); 7431 7432 // Verify and clean out per-function state. 7433 if (Body) { 7434 // C++ constructors that have function-try-blocks can't have return 7435 // statements in the handlers of that block. (C++ [except.handle]p14) 7436 // Verify this. 7437 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7438 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7439 7440 // Verify that gotos and switch cases don't jump into scopes illegally. 7441 if (getCurFunction()->NeedsScopeChecking() && 7442 !dcl->isInvalidDecl() && 7443 !hasAnyUnrecoverableErrorsInThisFunction()) 7444 DiagnoseInvalidJumps(Body); 7445 7446 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7447 if (!Destructor->getParent()->isDependentType()) 7448 CheckDestructor(Destructor); 7449 7450 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7451 Destructor->getParent()); 7452 } 7453 7454 // If any errors have occurred, clear out any temporaries that may have 7455 // been leftover. This ensures that these temporaries won't be picked up for 7456 // deletion in some later function. 7457 if (PP.getDiagnostics().hasErrorOccurred() || 7458 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7459 DiscardCleanupsInEvaluationContext(); 7460 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7461 // Since the body is valid, issue any analysis-based warnings that are 7462 // enabled. 7463 ActivePolicy = &WP; 7464 } 7465 7466 if (!IsInstantiation && FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7467 (!CheckConstexprFunctionDecl(FD) || 7468 !CheckConstexprFunctionBody(FD, Body))) 7469 FD->setInvalidDecl(); 7470 7471 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7472 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7473 assert(MaybeODRUseExprs.empty() && 7474 "Leftover expressions for odr-use checking"); 7475 } 7476 7477 if (!IsInstantiation) 7478 PopDeclContext(); 7479 7480 PopFunctionScopeInfo(ActivePolicy, dcl); 7481 7482 // If any errors have occurred, clear out any temporaries that may have 7483 // been leftover. This ensures that these temporaries won't be picked up for 7484 // deletion in some later function. 7485 if (getDiagnostics().hasErrorOccurred()) { 7486 DiscardCleanupsInEvaluationContext(); 7487 } 7488 7489 return dcl; 7490} 7491 7492 7493/// When we finish delayed parsing of an attribute, we must attach it to the 7494/// relevant Decl. 7495void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7496 ParsedAttributes &Attrs) { 7497 // Always attach attributes to the underlying decl. 7498 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) 7499 D = TD->getTemplatedDecl(); 7500 ProcessDeclAttributeList(S, D, Attrs.getList()); 7501} 7502 7503 7504/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7505/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7506NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7507 IdentifierInfo &II, Scope *S) { 7508 // Before we produce a declaration for an implicitly defined 7509 // function, see whether there was a locally-scoped declaration of 7510 // this name as a function or variable. If so, use that 7511 // (non-visible) declaration, and complain about it. 7512 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7513 = findLocallyScopedExternalDecl(&II); 7514 if (Pos != LocallyScopedExternalDecls.end()) { 7515 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7516 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7517 return Pos->second; 7518 } 7519 7520 // Extension in C99. Legal in C90, but warn about it. 7521 unsigned diag_id; 7522 if (II.getName().startswith("__builtin_")) 7523 diag_id = diag::warn_builtin_unknown; 7524 else if (getLangOptions().C99) 7525 diag_id = diag::ext_implicit_function_decl; 7526 else 7527 diag_id = diag::warn_implicit_function_decl; 7528 Diag(Loc, diag_id) << &II; 7529 7530 // Because typo correction is expensive, only do it if the implicit 7531 // function declaration is going to be treated as an error. 7532 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7533 TypoCorrection Corrected; 7534 DeclFilterCCC<FunctionDecl> Validator; 7535 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7536 LookupOrdinaryName, S, 0, Validator))) { 7537 std::string CorrectedStr = Corrected.getAsString(getLangOptions()); 7538 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOptions()); 7539 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>(); 7540 7541 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7542 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7543 7544 if (Func->getLocation().isValid() 7545 && !II.getName().startswith("__builtin_")) 7546 Diag(Func->getLocation(), diag::note_previous_decl) 7547 << CorrectedQuotedStr; 7548 } 7549 } 7550 7551 // Set a Declarator for the implicit definition: int foo(); 7552 const char *Dummy; 7553 AttributeFactory attrFactory; 7554 DeclSpec DS(attrFactory); 7555 unsigned DiagID; 7556 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7557 (void)Error; // Silence warning. 7558 assert(!Error && "Error setting up implicit decl!"); 7559 Declarator D(DS, Declarator::BlockContext); 7560 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7561 0, 0, true, SourceLocation(), 7562 SourceLocation(), SourceLocation(), 7563 SourceLocation(), 7564 EST_None, SourceLocation(), 7565 0, 0, 0, 0, Loc, Loc, D), 7566 DS.getAttributes(), 7567 SourceLocation()); 7568 D.SetIdentifier(&II, Loc); 7569 7570 // Insert this function into translation-unit scope. 7571 7572 DeclContext *PrevDC = CurContext; 7573 CurContext = Context.getTranslationUnitDecl(); 7574 7575 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7576 FD->setImplicit(); 7577 7578 CurContext = PrevDC; 7579 7580 AddKnownFunctionAttributes(FD); 7581 7582 return FD; 7583} 7584 7585/// \brief Adds any function attributes that we know a priori based on 7586/// the declaration of this function. 7587/// 7588/// These attributes can apply both to implicitly-declared builtins 7589/// (like __builtin___printf_chk) or to library-declared functions 7590/// like NSLog or printf. 7591/// 7592/// We need to check for duplicate attributes both here and where user-written 7593/// attributes are applied to declarations. 7594void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7595 if (FD->isInvalidDecl()) 7596 return; 7597 7598 // If this is a built-in function, map its builtin attributes to 7599 // actual attributes. 7600 if (unsigned BuiltinID = FD->getBuiltinID()) { 7601 // Handle printf-formatting attributes. 7602 unsigned FormatIdx; 7603 bool HasVAListArg; 7604 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7605 if (!FD->getAttr<FormatAttr>()) { 7606 const char *fmt = "printf"; 7607 unsigned int NumParams = FD->getNumParams(); 7608 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf) 7609 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType()) 7610 fmt = "NSString"; 7611 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7612 fmt, FormatIdx+1, 7613 HasVAListArg ? 0 : FormatIdx+2)); 7614 } 7615 } 7616 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7617 HasVAListArg)) { 7618 if (!FD->getAttr<FormatAttr>()) 7619 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7620 "scanf", FormatIdx+1, 7621 HasVAListArg ? 0 : FormatIdx+2)); 7622 } 7623 7624 // Mark const if we don't care about errno and that is the only 7625 // thing preventing the function from being const. This allows 7626 // IRgen to use LLVM intrinsics for such functions. 7627 if (!getLangOptions().MathErrno && 7628 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7629 if (!FD->getAttr<ConstAttr>()) 7630 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7631 } 7632 7633 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7634 !FD->getAttr<ReturnsTwiceAttr>()) 7635 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7636 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7637 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7638 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7639 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7640 } 7641 7642 IdentifierInfo *Name = FD->getIdentifier(); 7643 if (!Name) 7644 return; 7645 if ((!getLangOptions().CPlusPlus && 7646 FD->getDeclContext()->isTranslationUnit()) || 7647 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7648 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7649 LinkageSpecDecl::lang_c)) { 7650 // Okay: this could be a libc/libm/Objective-C function we know 7651 // about. 7652 } else 7653 return; 7654 7655 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7656 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7657 // target-specific builtins, perhaps? 7658 if (!FD->getAttr<FormatAttr>()) 7659 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7660 "printf", 2, 7661 Name->isStr("vasprintf") ? 0 : 3)); 7662 } 7663} 7664 7665TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7666 TypeSourceInfo *TInfo) { 7667 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7668 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7669 7670 if (!TInfo) { 7671 assert(D.isInvalidType() && "no declarator info for valid type"); 7672 TInfo = Context.getTrivialTypeSourceInfo(T); 7673 } 7674 7675 // Scope manipulation handled by caller. 7676 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7677 D.getLocStart(), 7678 D.getIdentifierLoc(), 7679 D.getIdentifier(), 7680 TInfo); 7681 7682 // Bail out immediately if we have an invalid declaration. 7683 if (D.isInvalidType()) { 7684 NewTD->setInvalidDecl(); 7685 return NewTD; 7686 } 7687 7688 if (D.getDeclSpec().isModulePrivateSpecified()) { 7689 if (CurContext->isFunctionOrMethod()) 7690 Diag(NewTD->getLocation(), diag::err_module_private_local) 7691 << 2 << NewTD->getDeclName() 7692 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7693 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7694 else 7695 NewTD->setModulePrivate(); 7696 } 7697 7698 // C++ [dcl.typedef]p8: 7699 // If the typedef declaration defines an unnamed class (or 7700 // enum), the first typedef-name declared by the declaration 7701 // to be that class type (or enum type) is used to denote the 7702 // class type (or enum type) for linkage purposes only. 7703 // We need to check whether the type was declared in the declaration. 7704 switch (D.getDeclSpec().getTypeSpecType()) { 7705 case TST_enum: 7706 case TST_struct: 7707 case TST_union: 7708 case TST_class: { 7709 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7710 7711 // Do nothing if the tag is not anonymous or already has an 7712 // associated typedef (from an earlier typedef in this decl group). 7713 if (tagFromDeclSpec->getIdentifier()) break; 7714 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7715 7716 // A well-formed anonymous tag must always be a TUK_Definition. 7717 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7718 7719 // The type must match the tag exactly; no qualifiers allowed. 7720 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7721 break; 7722 7723 // Otherwise, set this is the anon-decl typedef for the tag. 7724 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7725 break; 7726 } 7727 7728 default: 7729 break; 7730 } 7731 7732 return NewTD; 7733} 7734 7735 7736/// \brief Determine whether a tag with a given kind is acceptable 7737/// as a redeclaration of the given tag declaration. 7738/// 7739/// \returns true if the new tag kind is acceptable, false otherwise. 7740bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7741 TagTypeKind NewTag, bool isDefinition, 7742 SourceLocation NewTagLoc, 7743 const IdentifierInfo &Name) { 7744 // C++ [dcl.type.elab]p3: 7745 // The class-key or enum keyword present in the 7746 // elaborated-type-specifier shall agree in kind with the 7747 // declaration to which the name in the elaborated-type-specifier 7748 // refers. This rule also applies to the form of 7749 // elaborated-type-specifier that declares a class-name or 7750 // friend class since it can be construed as referring to the 7751 // definition of the class. Thus, in any 7752 // elaborated-type-specifier, the enum keyword shall be used to 7753 // refer to an enumeration (7.2), the union class-key shall be 7754 // used to refer to a union (clause 9), and either the class or 7755 // struct class-key shall be used to refer to a class (clause 9) 7756 // declared using the class or struct class-key. 7757 TagTypeKind OldTag = Previous->getTagKind(); 7758 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7759 if (OldTag == NewTag) 7760 return true; 7761 7762 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7763 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7764 // Warn about the struct/class tag mismatch. 7765 bool isTemplate = false; 7766 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7767 isTemplate = Record->getDescribedClassTemplate(); 7768 7769 if (!ActiveTemplateInstantiations.empty()) { 7770 // In a template instantiation, do not offer fix-its for tag mismatches 7771 // since they usually mess up the template instead of fixing the problem. 7772 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7773 << (NewTag == TTK_Class) << isTemplate << &Name; 7774 return true; 7775 } 7776 7777 if (isDefinition) { 7778 // On definitions, check previous tags and issue a fix-it for each 7779 // one that doesn't match the current tag. 7780 if (Previous->getDefinition()) { 7781 // Don't suggest fix-its for redefinitions. 7782 return true; 7783 } 7784 7785 bool previousMismatch = false; 7786 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7787 E(Previous->redecls_end()); I != E; ++I) { 7788 if (I->getTagKind() != NewTag) { 7789 if (!previousMismatch) { 7790 previousMismatch = true; 7791 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7792 << (NewTag == TTK_Class) << isTemplate << &Name; 7793 } 7794 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7795 << (NewTag == TTK_Class) 7796 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7797 NewTag == TTK_Class? 7798 "class" : "struct"); 7799 } 7800 } 7801 return true; 7802 } 7803 7804 // Check for a previous definition. If current tag and definition 7805 // are same type, do nothing. If no definition, but disagree with 7806 // with previous tag type, give a warning, but no fix-it. 7807 const TagDecl *Redecl = Previous->getDefinition() ? 7808 Previous->getDefinition() : Previous; 7809 if (Redecl->getTagKind() == NewTag) { 7810 return true; 7811 } 7812 7813 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7814 << (NewTag == TTK_Class) 7815 << isTemplate << &Name; 7816 Diag(Redecl->getLocation(), diag::note_previous_use); 7817 7818 // If there is a previous defintion, suggest a fix-it. 7819 if (Previous->getDefinition()) { 7820 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7821 << (Redecl->getTagKind() == TTK_Class) 7822 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7823 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7824 } 7825 7826 return true; 7827 } 7828 return false; 7829} 7830 7831/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7832/// former case, Name will be non-null. In the later case, Name will be null. 7833/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7834/// reference/declaration/definition of a tag. 7835Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7836 SourceLocation KWLoc, CXXScopeSpec &SS, 7837 IdentifierInfo *Name, SourceLocation NameLoc, 7838 AttributeList *Attr, AccessSpecifier AS, 7839 SourceLocation ModulePrivateLoc, 7840 MultiTemplateParamsArg TemplateParameterLists, 7841 bool &OwnedDecl, bool &IsDependent, 7842 SourceLocation ScopedEnumKWLoc, 7843 bool ScopedEnumUsesClassTag, 7844 TypeResult UnderlyingType) { 7845 // If this is not a definition, it must have a name. 7846 assert((Name != 0 || TUK == TUK_Definition) && 7847 "Nameless record must be a definition!"); 7848 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7849 7850 OwnedDecl = false; 7851 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7852 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 7853 7854 // FIXME: Check explicit specializations more carefully. 7855 bool isExplicitSpecialization = false; 7856 bool Invalid = false; 7857 7858 // We only need to do this matching if we have template parameters 7859 // or a scope specifier, which also conveniently avoids this work 7860 // for non-C++ cases. 7861 if (TemplateParameterLists.size() > 0 || 7862 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7863 if (TemplateParameterList *TemplateParams 7864 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7865 TemplateParameterLists.get(), 7866 TemplateParameterLists.size(), 7867 TUK == TUK_Friend, 7868 isExplicitSpecialization, 7869 Invalid)) { 7870 if (TemplateParams->size() > 0) { 7871 // This is a declaration or definition of a class template (which may 7872 // be a member of another template). 7873 7874 if (Invalid) 7875 return 0; 7876 7877 OwnedDecl = false; 7878 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7879 SS, Name, NameLoc, Attr, 7880 TemplateParams, AS, 7881 ModulePrivateLoc, 7882 TemplateParameterLists.size() - 1, 7883 (TemplateParameterList**) TemplateParameterLists.release()); 7884 return Result.get(); 7885 } else { 7886 // The "template<>" header is extraneous. 7887 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7888 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7889 isExplicitSpecialization = true; 7890 } 7891 } 7892 } 7893 7894 // Figure out the underlying type if this a enum declaration. We need to do 7895 // this early, because it's needed to detect if this is an incompatible 7896 // redeclaration. 7897 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7898 7899 if (Kind == TTK_Enum) { 7900 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7901 // No underlying type explicitly specified, or we failed to parse the 7902 // type, default to int. 7903 EnumUnderlying = Context.IntTy.getTypePtr(); 7904 else if (UnderlyingType.get()) { 7905 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7906 // integral type; any cv-qualification is ignored. 7907 TypeSourceInfo *TI = 0; 7908 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7909 EnumUnderlying = TI; 7910 7911 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7912 7913 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7914 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7915 << T; 7916 // Recover by falling back to int. 7917 EnumUnderlying = Context.IntTy.getTypePtr(); 7918 } 7919 7920 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7921 UPPC_FixedUnderlyingType)) 7922 EnumUnderlying = Context.IntTy.getTypePtr(); 7923 7924 } else if (getLangOptions().MicrosoftMode) 7925 // Microsoft enums are always of int type. 7926 EnumUnderlying = Context.IntTy.getTypePtr(); 7927 } 7928 7929 DeclContext *SearchDC = CurContext; 7930 DeclContext *DC = CurContext; 7931 bool isStdBadAlloc = false; 7932 7933 RedeclarationKind Redecl = ForRedeclaration; 7934 if (TUK == TUK_Friend || TUK == TUK_Reference) 7935 Redecl = NotForRedeclaration; 7936 7937 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7938 7939 if (Name && SS.isNotEmpty()) { 7940 // We have a nested-name tag ('struct foo::bar'). 7941 7942 // Check for invalid 'foo::'. 7943 if (SS.isInvalid()) { 7944 Name = 0; 7945 goto CreateNewDecl; 7946 } 7947 7948 // If this is a friend or a reference to a class in a dependent 7949 // context, don't try to make a decl for it. 7950 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7951 DC = computeDeclContext(SS, false); 7952 if (!DC) { 7953 IsDependent = true; 7954 return 0; 7955 } 7956 } else { 7957 DC = computeDeclContext(SS, true); 7958 if (!DC) { 7959 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7960 << SS.getRange(); 7961 return 0; 7962 } 7963 } 7964 7965 if (RequireCompleteDeclContext(SS, DC)) 7966 return 0; 7967 7968 SearchDC = DC; 7969 // Look-up name inside 'foo::'. 7970 LookupQualifiedName(Previous, DC); 7971 7972 if (Previous.isAmbiguous()) 7973 return 0; 7974 7975 if (Previous.empty()) { 7976 // Name lookup did not find anything. However, if the 7977 // nested-name-specifier refers to the current instantiation, 7978 // and that current instantiation has any dependent base 7979 // classes, we might find something at instantiation time: treat 7980 // this as a dependent elaborated-type-specifier. 7981 // But this only makes any sense for reference-like lookups. 7982 if (Previous.wasNotFoundInCurrentInstantiation() && 7983 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7984 IsDependent = true; 7985 return 0; 7986 } 7987 7988 // A tag 'foo::bar' must already exist. 7989 Diag(NameLoc, diag::err_not_tag_in_scope) 7990 << Kind << Name << DC << SS.getRange(); 7991 Name = 0; 7992 Invalid = true; 7993 goto CreateNewDecl; 7994 } 7995 } else if (Name) { 7996 // If this is a named struct, check to see if there was a previous forward 7997 // declaration or definition. 7998 // FIXME: We're looking into outer scopes here, even when we 7999 // shouldn't be. Doing so can result in ambiguities that we 8000 // shouldn't be diagnosing. 8001 LookupName(Previous, S); 8002 8003 if (Previous.isAmbiguous() && 8004 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 8005 LookupResult::Filter F = Previous.makeFilter(); 8006 while (F.hasNext()) { 8007 NamedDecl *ND = F.next(); 8008 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 8009 F.erase(); 8010 } 8011 F.done(); 8012 } 8013 8014 // Note: there used to be some attempt at recovery here. 8015 if (Previous.isAmbiguous()) 8016 return 0; 8017 8018 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 8019 // FIXME: This makes sure that we ignore the contexts associated 8020 // with C structs, unions, and enums when looking for a matching 8021 // tag declaration or definition. See the similar lookup tweak 8022 // in Sema::LookupName; is there a better way to deal with this? 8023 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 8024 SearchDC = SearchDC->getParent(); 8025 } 8026 } else if (S->isFunctionPrototypeScope()) { 8027 // If this is an enum declaration in function prototype scope, set its 8028 // initial context to the translation unit. 8029 SearchDC = Context.getTranslationUnitDecl(); 8030 } 8031 8032 if (Previous.isSingleResult() && 8033 Previous.getFoundDecl()->isTemplateParameter()) { 8034 // Maybe we will complain about the shadowed template parameter. 8035 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 8036 // Just pretend that we didn't see the previous declaration. 8037 Previous.clear(); 8038 } 8039 8040 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 8041 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 8042 // This is a declaration of or a reference to "std::bad_alloc". 8043 isStdBadAlloc = true; 8044 8045 if (Previous.empty() && StdBadAlloc) { 8046 // std::bad_alloc has been implicitly declared (but made invisible to 8047 // name lookup). Fill in this implicit declaration as the previous 8048 // declaration, so that the declarations get chained appropriately. 8049 Previous.addDecl(getStdBadAlloc()); 8050 } 8051 } 8052 8053 // If we didn't find a previous declaration, and this is a reference 8054 // (or friend reference), move to the correct scope. In C++, we 8055 // also need to do a redeclaration lookup there, just in case 8056 // there's a shadow friend decl. 8057 if (Name && Previous.empty() && 8058 (TUK == TUK_Reference || TUK == TUK_Friend)) { 8059 if (Invalid) goto CreateNewDecl; 8060 assert(SS.isEmpty()); 8061 8062 if (TUK == TUK_Reference) { 8063 // C++ [basic.scope.pdecl]p5: 8064 // -- for an elaborated-type-specifier of the form 8065 // 8066 // class-key identifier 8067 // 8068 // if the elaborated-type-specifier is used in the 8069 // decl-specifier-seq or parameter-declaration-clause of a 8070 // function defined in namespace scope, the identifier is 8071 // declared as a class-name in the namespace that contains 8072 // the declaration; otherwise, except as a friend 8073 // declaration, the identifier is declared in the smallest 8074 // non-class, non-function-prototype scope that contains the 8075 // declaration. 8076 // 8077 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 8078 // C structs and unions. 8079 // 8080 // It is an error in C++ to declare (rather than define) an enum 8081 // type, including via an elaborated type specifier. We'll 8082 // diagnose that later; for now, declare the enum in the same 8083 // scope as we would have picked for any other tag type. 8084 // 8085 // GNU C also supports this behavior as part of its incomplete 8086 // enum types extension, while GNU C++ does not. 8087 // 8088 // Find the context where we'll be declaring the tag. 8089 // FIXME: We would like to maintain the current DeclContext as the 8090 // lexical context, 8091 while (SearchDC->isRecord() || SearchDC->isTransparentContext() || 8092 SearchDC->isObjCContainer()) 8093 SearchDC = SearchDC->getParent(); 8094 8095 // Find the scope where we'll be declaring the tag. 8096 while (S->isClassScope() || 8097 (getLangOptions().CPlusPlus && 8098 S->isFunctionPrototypeScope()) || 8099 ((S->getFlags() & Scope::DeclScope) == 0) || 8100 (S->getEntity() && 8101 ((DeclContext *)S->getEntity())->isTransparentContext())) 8102 S = S->getParent(); 8103 } else { 8104 assert(TUK == TUK_Friend); 8105 // C++ [namespace.memdef]p3: 8106 // If a friend declaration in a non-local class first declares a 8107 // class or function, the friend class or function is a member of 8108 // the innermost enclosing namespace. 8109 SearchDC = SearchDC->getEnclosingNamespaceContext(); 8110 } 8111 8112 // In C++, we need to do a redeclaration lookup to properly 8113 // diagnose some problems. 8114 if (getLangOptions().CPlusPlus) { 8115 Previous.setRedeclarationKind(ForRedeclaration); 8116 LookupQualifiedName(Previous, SearchDC); 8117 } 8118 } 8119 8120 if (!Previous.empty()) { 8121 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 8122 8123 // It's okay to have a tag decl in the same scope as a typedef 8124 // which hides a tag decl in the same scope. Finding this 8125 // insanity with a redeclaration lookup can only actually happen 8126 // in C++. 8127 // 8128 // This is also okay for elaborated-type-specifiers, which is 8129 // technically forbidden by the current standard but which is 8130 // okay according to the likely resolution of an open issue; 8131 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 8132 if (getLangOptions().CPlusPlus) { 8133 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8134 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 8135 TagDecl *Tag = TT->getDecl(); 8136 if (Tag->getDeclName() == Name && 8137 Tag->getDeclContext()->getRedeclContext() 8138 ->Equals(TD->getDeclContext()->getRedeclContext())) { 8139 PrevDecl = Tag; 8140 Previous.clear(); 8141 Previous.addDecl(Tag); 8142 Previous.resolveKind(); 8143 } 8144 } 8145 } 8146 } 8147 8148 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 8149 // If this is a use of a previous tag, or if the tag is already declared 8150 // in the same scope (so that the definition/declaration completes or 8151 // rementions the tag), reuse the decl. 8152 if (TUK == TUK_Reference || TUK == TUK_Friend || 8153 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 8154 // Make sure that this wasn't declared as an enum and now used as a 8155 // struct or something similar. 8156 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 8157 TUK == TUK_Definition, KWLoc, 8158 *Name)) { 8159 bool SafeToContinue 8160 = (PrevTagDecl->getTagKind() != TTK_Enum && 8161 Kind != TTK_Enum); 8162 if (SafeToContinue) 8163 Diag(KWLoc, diag::err_use_with_wrong_tag) 8164 << Name 8165 << FixItHint::CreateReplacement(SourceRange(KWLoc), 8166 PrevTagDecl->getKindName()); 8167 else 8168 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 8169 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8170 8171 if (SafeToContinue) 8172 Kind = PrevTagDecl->getTagKind(); 8173 else { 8174 // Recover by making this an anonymous redefinition. 8175 Name = 0; 8176 Previous.clear(); 8177 Invalid = true; 8178 } 8179 } 8180 8181 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 8182 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 8183 8184 // If this is an elaborated-type-specifier for a scoped enumeration, 8185 // the 'class' keyword is not necessary and not permitted. 8186 if (TUK == TUK_Reference || TUK == TUK_Friend) { 8187 if (ScopedEnum) 8188 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 8189 << PrevEnum->isScoped() 8190 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 8191 return PrevTagDecl; 8192 } 8193 8194 // All conflicts with previous declarations are recovered by 8195 // returning the previous declaration. 8196 if (ScopedEnum != PrevEnum->isScoped()) { 8197 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 8198 << PrevEnum->isScoped(); 8199 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8200 return PrevTagDecl; 8201 } 8202 else if (EnumUnderlying && PrevEnum->isFixed()) { 8203 QualType T; 8204 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8205 T = TI->getType(); 8206 else 8207 T = QualType(EnumUnderlying.get<const Type*>(), 0); 8208 8209 if (!Context.hasSameUnqualifiedType(T, 8210 PrevEnum->getIntegerType())) { 8211 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 8212 diag::err_enum_redeclare_type_mismatch) 8213 << T 8214 << PrevEnum->getIntegerType(); 8215 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8216 return PrevTagDecl; 8217 } 8218 } 8219 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 8220 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 8221 << PrevEnum->isFixed(); 8222 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8223 return PrevTagDecl; 8224 } 8225 } 8226 8227 if (!Invalid) { 8228 // If this is a use, just return the declaration we found. 8229 8230 // FIXME: In the future, return a variant or some other clue 8231 // for the consumer of this Decl to know it doesn't own it. 8232 // For our current ASTs this shouldn't be a problem, but will 8233 // need to be changed with DeclGroups. 8234 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 8235 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 8236 return PrevTagDecl; 8237 8238 // Diagnose attempts to redefine a tag. 8239 if (TUK == TUK_Definition) { 8240 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 8241 // If we're defining a specialization and the previous definition 8242 // is from an implicit instantiation, don't emit an error 8243 // here; we'll catch this in the general case below. 8244 if (!isExplicitSpecialization || 8245 !isa<CXXRecordDecl>(Def) || 8246 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 8247 == TSK_ExplicitSpecialization) { 8248 // A redeclaration in function prototype scope in C isn't 8249 // visible elsewhere, so merely issue a warning. 8250 if (!getLangOptions().CPlusPlus && S->containedInPrototypeScope()) 8251 Diag(NameLoc, diag::warn_redefinition_in_param_list) << Name; 8252 else 8253 Diag(NameLoc, diag::err_redefinition) << Name; 8254 Diag(Def->getLocation(), diag::note_previous_definition); 8255 // If this is a redefinition, recover by making this 8256 // struct be anonymous, which will make any later 8257 // references get the previous definition. 8258 Name = 0; 8259 Previous.clear(); 8260 Invalid = true; 8261 } 8262 } else { 8263 // If the type is currently being defined, complain 8264 // about a nested redefinition. 8265 const TagType *Tag 8266 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8267 if (Tag->isBeingDefined()) { 8268 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8269 Diag(PrevTagDecl->getLocation(), 8270 diag::note_previous_definition); 8271 Name = 0; 8272 Previous.clear(); 8273 Invalid = true; 8274 } 8275 } 8276 8277 // Okay, this is definition of a previously declared or referenced 8278 // tag PrevDecl. We're going to create a new Decl for it. 8279 } 8280 } 8281 // If we get here we have (another) forward declaration or we 8282 // have a definition. Just create a new decl. 8283 8284 } else { 8285 // If we get here, this is a definition of a new tag type in a nested 8286 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8287 // new decl/type. We set PrevDecl to NULL so that the entities 8288 // have distinct types. 8289 Previous.clear(); 8290 } 8291 // If we get here, we're going to create a new Decl. If PrevDecl 8292 // is non-NULL, it's a definition of the tag declared by 8293 // PrevDecl. If it's NULL, we have a new definition. 8294 8295 8296 // Otherwise, PrevDecl is not a tag, but was found with tag 8297 // lookup. This is only actually possible in C++, where a few 8298 // things like templates still live in the tag namespace. 8299 } else { 8300 // Use a better diagnostic if an elaborated-type-specifier 8301 // found the wrong kind of type on the first 8302 // (non-redeclaration) lookup. 8303 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8304 !Previous.isForRedeclaration()) { 8305 unsigned Kind = 0; 8306 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8307 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8308 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8309 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8310 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8311 Invalid = true; 8312 8313 // Otherwise, only diagnose if the declaration is in scope. 8314 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8315 isExplicitSpecialization)) { 8316 // do nothing 8317 8318 // Diagnose implicit declarations introduced by elaborated types. 8319 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8320 unsigned Kind = 0; 8321 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8322 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8323 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8324 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8325 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8326 Invalid = true; 8327 8328 // Otherwise it's a declaration. Call out a particularly common 8329 // case here. 8330 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8331 unsigned Kind = 0; 8332 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8333 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8334 << Name << Kind << TND->getUnderlyingType(); 8335 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8336 Invalid = true; 8337 8338 // Otherwise, diagnose. 8339 } else { 8340 // The tag name clashes with something else in the target scope, 8341 // issue an error and recover by making this tag be anonymous. 8342 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8343 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8344 Name = 0; 8345 Invalid = true; 8346 } 8347 8348 // The existing declaration isn't relevant to us; we're in a 8349 // new scope, so clear out the previous declaration. 8350 Previous.clear(); 8351 } 8352 } 8353 8354CreateNewDecl: 8355 8356 TagDecl *PrevDecl = 0; 8357 if (Previous.isSingleResult()) 8358 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8359 8360 // If there is an identifier, use the location of the identifier as the 8361 // location of the decl, otherwise use the location of the struct/union 8362 // keyword. 8363 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8364 8365 // Otherwise, create a new declaration. If there is a previous 8366 // declaration of the same entity, the two will be linked via 8367 // PrevDecl. 8368 TagDecl *New; 8369 8370 bool IsForwardReference = false; 8371 if (Kind == TTK_Enum) { 8372 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8373 // enum X { A, B, C } D; D should chain to X. 8374 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8375 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8376 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8377 // If this is an undefined enum, warn. 8378 if (TUK != TUK_Definition && !Invalid) { 8379 TagDecl *Def; 8380 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8381 // C++0x: 7.2p2: opaque-enum-declaration. 8382 // Conflicts are diagnosed above. Do nothing. 8383 } 8384 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8385 Diag(Loc, diag::ext_forward_ref_enum_def) 8386 << New; 8387 Diag(Def->getLocation(), diag::note_previous_definition); 8388 } else { 8389 unsigned DiagID = diag::ext_forward_ref_enum; 8390 if (getLangOptions().MicrosoftMode) 8391 DiagID = diag::ext_ms_forward_ref_enum; 8392 else if (getLangOptions().CPlusPlus) 8393 DiagID = diag::err_forward_ref_enum; 8394 Diag(Loc, DiagID); 8395 8396 // If this is a forward-declared reference to an enumeration, make a 8397 // note of it; we won't actually be introducing the declaration into 8398 // the declaration context. 8399 if (TUK == TUK_Reference) 8400 IsForwardReference = true; 8401 } 8402 } 8403 8404 if (EnumUnderlying) { 8405 EnumDecl *ED = cast<EnumDecl>(New); 8406 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8407 ED->setIntegerTypeSourceInfo(TI); 8408 else 8409 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8410 ED->setPromotionType(ED->getIntegerType()); 8411 } 8412 8413 } else { 8414 // struct/union/class 8415 8416 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8417 // struct X { int A; } D; D should chain to X. 8418 if (getLangOptions().CPlusPlus) { 8419 // FIXME: Look for a way to use RecordDecl for simple structs. 8420 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8421 cast_or_null<CXXRecordDecl>(PrevDecl)); 8422 8423 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8424 StdBadAlloc = cast<CXXRecordDecl>(New); 8425 } else 8426 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8427 cast_or_null<RecordDecl>(PrevDecl)); 8428 } 8429 8430 // Maybe add qualifier info. 8431 if (SS.isNotEmpty()) { 8432 if (SS.isSet()) { 8433 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8434 if (TemplateParameterLists.size() > 0) { 8435 New->setTemplateParameterListsInfo(Context, 8436 TemplateParameterLists.size(), 8437 (TemplateParameterList**) TemplateParameterLists.release()); 8438 } 8439 } 8440 else 8441 Invalid = true; 8442 } 8443 8444 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8445 // Add alignment attributes if necessary; these attributes are checked when 8446 // the ASTContext lays out the structure. 8447 // 8448 // It is important for implementing the correct semantics that this 8449 // happen here (in act on tag decl). The #pragma pack stack is 8450 // maintained as a result of parser callbacks which can occur at 8451 // many points during the parsing of a struct declaration (because 8452 // the #pragma tokens are effectively skipped over during the 8453 // parsing of the struct). 8454 AddAlignmentAttributesForRecord(RD); 8455 8456 AddMsStructLayoutForRecord(RD); 8457 } 8458 8459 if (ModulePrivateLoc.isValid()) { 8460 if (isExplicitSpecialization) 8461 Diag(New->getLocation(), diag::err_module_private_specialization) 8462 << 2 8463 << FixItHint::CreateRemoval(ModulePrivateLoc); 8464 // __module_private__ does not apply to local classes. However, we only 8465 // diagnose this as an error when the declaration specifiers are 8466 // freestanding. Here, we just ignore the __module_private__. 8467 else if (!SearchDC->isFunctionOrMethod()) 8468 New->setModulePrivate(); 8469 } 8470 8471 // If this is a specialization of a member class (of a class template), 8472 // check the specialization. 8473 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8474 Invalid = true; 8475 8476 if (Invalid) 8477 New->setInvalidDecl(); 8478 8479 if (Attr) 8480 ProcessDeclAttributeList(S, New, Attr); 8481 8482 // If we're declaring or defining a tag in function prototype scope 8483 // in C, note that this type can only be used within the function. 8484 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8485 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8486 8487 // Set the lexical context. If the tag has a C++ scope specifier, the 8488 // lexical context will be different from the semantic context. 8489 New->setLexicalDeclContext(CurContext); 8490 8491 // Mark this as a friend decl if applicable. 8492 // In Microsoft mode, a friend declaration also acts as a forward 8493 // declaration so we always pass true to setObjectOfFriendDecl to make 8494 // the tag name visible. 8495 if (TUK == TUK_Friend) 8496 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8497 getLangOptions().MicrosoftExt); 8498 8499 // Set the access specifier. 8500 if (!Invalid && SearchDC->isRecord()) 8501 SetMemberAccessSpecifier(New, PrevDecl, AS); 8502 8503 if (TUK == TUK_Definition) 8504 New->startDefinition(); 8505 8506 // If this has an identifier, add it to the scope stack. 8507 if (TUK == TUK_Friend) { 8508 // We might be replacing an existing declaration in the lookup tables; 8509 // if so, borrow its access specifier. 8510 if (PrevDecl) 8511 New->setAccess(PrevDecl->getAccess()); 8512 8513 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8514 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8515 if (Name) // can be null along some error paths 8516 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8517 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8518 } else if (Name) { 8519 S = getNonFieldDeclScope(S); 8520 PushOnScopeChains(New, S, !IsForwardReference); 8521 if (IsForwardReference) 8522 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8523 8524 } else { 8525 CurContext->addDecl(New); 8526 } 8527 8528 // If this is the C FILE type, notify the AST context. 8529 if (IdentifierInfo *II = New->getIdentifier()) 8530 if (!New->isInvalidDecl() && 8531 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8532 II->isStr("FILE")) 8533 Context.setFILEDecl(New); 8534 8535 // If we were in function prototype scope (and not in C++ mode), add this 8536 // tag to the list of decls to inject into the function definition scope. 8537 if (S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus && 8538 InFunctionDeclarator && Name) 8539 DeclsInPrototypeScope.push_back(New); 8540 8541 OwnedDecl = true; 8542 return New; 8543} 8544 8545void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8546 AdjustDeclIfTemplate(TagD); 8547 TagDecl *Tag = cast<TagDecl>(TagD); 8548 8549 // Enter the tag context. 8550 PushDeclContext(S, Tag); 8551} 8552 8553Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8554 assert(isa<ObjCContainerDecl>(IDecl) && 8555 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8556 DeclContext *OCD = cast<DeclContext>(IDecl); 8557 assert(getContainingDC(OCD) == CurContext && 8558 "The next DeclContext should be lexically contained in the current one."); 8559 CurContext = OCD; 8560 return IDecl; 8561} 8562 8563void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8564 SourceLocation FinalLoc, 8565 SourceLocation LBraceLoc) { 8566 AdjustDeclIfTemplate(TagD); 8567 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8568 8569 FieldCollector->StartClass(); 8570 8571 if (!Record->getIdentifier()) 8572 return; 8573 8574 if (FinalLoc.isValid()) 8575 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8576 8577 // C++ [class]p2: 8578 // [...] The class-name is also inserted into the scope of the 8579 // class itself; this is known as the injected-class-name. For 8580 // purposes of access checking, the injected-class-name is treated 8581 // as if it were a public member name. 8582 CXXRecordDecl *InjectedClassName 8583 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8584 Record->getLocStart(), Record->getLocation(), 8585 Record->getIdentifier(), 8586 /*PrevDecl=*/0, 8587 /*DelayTypeCreation=*/true); 8588 Context.getTypeDeclType(InjectedClassName, Record); 8589 InjectedClassName->setImplicit(); 8590 InjectedClassName->setAccess(AS_public); 8591 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8592 InjectedClassName->setDescribedClassTemplate(Template); 8593 PushOnScopeChains(InjectedClassName, S); 8594 assert(InjectedClassName->isInjectedClassName() && 8595 "Broken injected-class-name"); 8596} 8597 8598void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8599 SourceLocation RBraceLoc) { 8600 AdjustDeclIfTemplate(TagD); 8601 TagDecl *Tag = cast<TagDecl>(TagD); 8602 Tag->setRBraceLoc(RBraceLoc); 8603 8604 if (isa<CXXRecordDecl>(Tag)) 8605 FieldCollector->FinishClass(); 8606 8607 // Exit this scope of this tag's definition. 8608 PopDeclContext(); 8609 8610 // Notify the consumer that we've defined a tag. 8611 Consumer.HandleTagDeclDefinition(Tag); 8612} 8613 8614void Sema::ActOnObjCContainerFinishDefinition() { 8615 // Exit this scope of this interface definition. 8616 PopDeclContext(); 8617} 8618 8619void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8620 assert(DC == CurContext && "Mismatch of container contexts"); 8621 OriginalLexicalContext = DC; 8622 ActOnObjCContainerFinishDefinition(); 8623} 8624 8625void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8626 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8627 OriginalLexicalContext = 0; 8628} 8629 8630void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8631 AdjustDeclIfTemplate(TagD); 8632 TagDecl *Tag = cast<TagDecl>(TagD); 8633 Tag->setInvalidDecl(); 8634 8635 // We're undoing ActOnTagStartDefinition here, not 8636 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8637 // the FieldCollector. 8638 8639 PopDeclContext(); 8640} 8641 8642// Note that FieldName may be null for anonymous bitfields. 8643ExprResult Sema::VerifyBitField(SourceLocation FieldLoc, 8644 IdentifierInfo *FieldName, 8645 QualType FieldTy, Expr *BitWidth, 8646 bool *ZeroWidth) { 8647 // Default to true; that shouldn't confuse checks for emptiness 8648 if (ZeroWidth) 8649 *ZeroWidth = true; 8650 8651 // C99 6.7.2.1p4 - verify the field type. 8652 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8653 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8654 // Handle incomplete types with specific error. 8655 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8656 return ExprError(); 8657 if (FieldName) 8658 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8659 << FieldName << FieldTy << BitWidth->getSourceRange(); 8660 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8661 << FieldTy << BitWidth->getSourceRange(); 8662 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8663 UPPC_BitFieldWidth)) 8664 return ExprError(); 8665 8666 // If the bit-width is type- or value-dependent, don't try to check 8667 // it now. 8668 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8669 return Owned(BitWidth); 8670 8671 llvm::APSInt Value; 8672 ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value); 8673 if (ICE.isInvalid()) 8674 return ICE; 8675 BitWidth = ICE.take(); 8676 8677 if (Value != 0 && ZeroWidth) 8678 *ZeroWidth = false; 8679 8680 // Zero-width bitfield is ok for anonymous field. 8681 if (Value == 0 && FieldName) 8682 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8683 8684 if (Value.isSigned() && Value.isNegative()) { 8685 if (FieldName) 8686 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8687 << FieldName << Value.toString(10); 8688 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8689 << Value.toString(10); 8690 } 8691 8692 if (!FieldTy->isDependentType()) { 8693 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8694 if (Value.getZExtValue() > TypeSize) { 8695 if (!getLangOptions().CPlusPlus) { 8696 if (FieldName) 8697 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8698 << FieldName << (unsigned)Value.getZExtValue() 8699 << (unsigned)TypeSize; 8700 8701 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8702 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8703 } 8704 8705 if (FieldName) 8706 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8707 << FieldName << (unsigned)Value.getZExtValue() 8708 << (unsigned)TypeSize; 8709 else 8710 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8711 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8712 } 8713 } 8714 8715 return Owned(BitWidth); 8716} 8717 8718/// ActOnField - Each field of a C struct/union is passed into this in order 8719/// to create a FieldDecl object for it. 8720Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8721 Declarator &D, Expr *BitfieldWidth) { 8722 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8723 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8724 /*HasInit=*/false, AS_public); 8725 return Res; 8726} 8727 8728/// HandleField - Analyze a field of a C struct or a C++ data member. 8729/// 8730FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8731 SourceLocation DeclStart, 8732 Declarator &D, Expr *BitWidth, bool HasInit, 8733 AccessSpecifier AS) { 8734 IdentifierInfo *II = D.getIdentifier(); 8735 SourceLocation Loc = DeclStart; 8736 if (II) Loc = D.getIdentifierLoc(); 8737 8738 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8739 QualType T = TInfo->getType(); 8740 if (getLangOptions().CPlusPlus) { 8741 CheckExtraCXXDefaultArguments(D); 8742 8743 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8744 UPPC_DataMemberType)) { 8745 D.setInvalidType(); 8746 T = Context.IntTy; 8747 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8748 } 8749 } 8750 8751 DiagnoseFunctionSpecifiers(D); 8752 8753 if (D.getDeclSpec().isThreadSpecified()) 8754 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8755 if (D.getDeclSpec().isConstexprSpecified()) 8756 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8757 << 2; 8758 8759 // Check to see if this name was declared as a member previously 8760 NamedDecl *PrevDecl = 0; 8761 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8762 LookupName(Previous, S); 8763 switch (Previous.getResultKind()) { 8764 case LookupResult::Found: 8765 case LookupResult::FoundUnresolvedValue: 8766 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8767 break; 8768 8769 case LookupResult::FoundOverloaded: 8770 PrevDecl = Previous.getRepresentativeDecl(); 8771 break; 8772 8773 case LookupResult::NotFound: 8774 case LookupResult::NotFoundInCurrentInstantiation: 8775 case LookupResult::Ambiguous: 8776 break; 8777 } 8778 Previous.suppressDiagnostics(); 8779 8780 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8781 // Maybe we will complain about the shadowed template parameter. 8782 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8783 // Just pretend that we didn't see the previous declaration. 8784 PrevDecl = 0; 8785 } 8786 8787 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8788 PrevDecl = 0; 8789 8790 bool Mutable 8791 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8792 SourceLocation TSSL = D.getLocStart(); 8793 FieldDecl *NewFD 8794 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8795 TSSL, AS, PrevDecl, &D); 8796 8797 if (NewFD->isInvalidDecl()) 8798 Record->setInvalidDecl(); 8799 8800 if (D.getDeclSpec().isModulePrivateSpecified()) 8801 NewFD->setModulePrivate(); 8802 8803 if (NewFD->isInvalidDecl() && PrevDecl) { 8804 // Don't introduce NewFD into scope; there's already something 8805 // with the same name in the same scope. 8806 } else if (II) { 8807 PushOnScopeChains(NewFD, S); 8808 } else 8809 Record->addDecl(NewFD); 8810 8811 return NewFD; 8812} 8813 8814/// \brief Build a new FieldDecl and check its well-formedness. 8815/// 8816/// This routine builds a new FieldDecl given the fields name, type, 8817/// record, etc. \p PrevDecl should refer to any previous declaration 8818/// with the same name and in the same scope as the field to be 8819/// created. 8820/// 8821/// \returns a new FieldDecl. 8822/// 8823/// \todo The Declarator argument is a hack. It will be removed once 8824FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8825 TypeSourceInfo *TInfo, 8826 RecordDecl *Record, SourceLocation Loc, 8827 bool Mutable, Expr *BitWidth, bool HasInit, 8828 SourceLocation TSSL, 8829 AccessSpecifier AS, NamedDecl *PrevDecl, 8830 Declarator *D) { 8831 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8832 bool InvalidDecl = false; 8833 if (D) InvalidDecl = D->isInvalidType(); 8834 8835 // If we receive a broken type, recover by assuming 'int' and 8836 // marking this declaration as invalid. 8837 if (T.isNull()) { 8838 InvalidDecl = true; 8839 T = Context.IntTy; 8840 } 8841 8842 QualType EltTy = Context.getBaseElementType(T); 8843 if (!EltTy->isDependentType() && 8844 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8845 // Fields of incomplete type force their record to be invalid. 8846 Record->setInvalidDecl(); 8847 InvalidDecl = true; 8848 } 8849 8850 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8851 // than a variably modified type. 8852 if (!InvalidDecl && T->isVariablyModifiedType()) { 8853 bool SizeIsNegative; 8854 llvm::APSInt Oversized; 8855 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8856 SizeIsNegative, 8857 Oversized); 8858 if (!FixedTy.isNull()) { 8859 Diag(Loc, diag::warn_illegal_constant_array_size); 8860 T = FixedTy; 8861 } else { 8862 if (SizeIsNegative) 8863 Diag(Loc, diag::err_typecheck_negative_array_size); 8864 else if (Oversized.getBoolValue()) 8865 Diag(Loc, diag::err_array_too_large) 8866 << Oversized.toString(10); 8867 else 8868 Diag(Loc, diag::err_typecheck_field_variable_size); 8869 InvalidDecl = true; 8870 } 8871 } 8872 8873 // Fields can not have abstract class types 8874 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8875 diag::err_abstract_type_in_decl, 8876 AbstractFieldType)) 8877 InvalidDecl = true; 8878 8879 bool ZeroWidth = false; 8880 // If this is declared as a bit-field, check the bit-field. 8881 if (!InvalidDecl && BitWidth) { 8882 BitWidth = VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth).take(); 8883 if (!BitWidth) { 8884 InvalidDecl = true; 8885 BitWidth = 0; 8886 ZeroWidth = false; 8887 } 8888 } 8889 8890 // Check that 'mutable' is consistent with the type of the declaration. 8891 if (!InvalidDecl && Mutable) { 8892 unsigned DiagID = 0; 8893 if (T->isReferenceType()) 8894 DiagID = diag::err_mutable_reference; 8895 else if (T.isConstQualified()) 8896 DiagID = diag::err_mutable_const; 8897 8898 if (DiagID) { 8899 SourceLocation ErrLoc = Loc; 8900 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8901 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8902 Diag(ErrLoc, DiagID); 8903 Mutable = false; 8904 InvalidDecl = true; 8905 } 8906 } 8907 8908 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8909 BitWidth, Mutable, HasInit); 8910 if (InvalidDecl) 8911 NewFD->setInvalidDecl(); 8912 8913 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8914 Diag(Loc, diag::err_duplicate_member) << II; 8915 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8916 NewFD->setInvalidDecl(); 8917 } 8918 8919 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8920 if (Record->isUnion()) { 8921 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8922 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8923 if (RDecl->getDefinition()) { 8924 // C++ [class.union]p1: An object of a class with a non-trivial 8925 // constructor, a non-trivial copy constructor, a non-trivial 8926 // destructor, or a non-trivial copy assignment operator 8927 // cannot be a member of a union, nor can an array of such 8928 // objects. 8929 if (CheckNontrivialField(NewFD)) 8930 NewFD->setInvalidDecl(); 8931 } 8932 } 8933 8934 // C++ [class.union]p1: If a union contains a member of reference type, 8935 // the program is ill-formed. 8936 if (EltTy->isReferenceType()) { 8937 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8938 << NewFD->getDeclName() << EltTy; 8939 NewFD->setInvalidDecl(); 8940 } 8941 } 8942 } 8943 8944 // FIXME: We need to pass in the attributes given an AST 8945 // representation, not a parser representation. 8946 if (D) 8947 // FIXME: What to pass instead of TUScope? 8948 ProcessDeclAttributes(TUScope, NewFD, *D); 8949 8950 // In auto-retain/release, infer strong retension for fields of 8951 // retainable type. 8952 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8953 NewFD->setInvalidDecl(); 8954 8955 if (T.isObjCGCWeak()) 8956 Diag(Loc, diag::warn_attribute_weak_on_field); 8957 8958 NewFD->setAccess(AS); 8959 return NewFD; 8960} 8961 8962bool Sema::CheckNontrivialField(FieldDecl *FD) { 8963 assert(FD); 8964 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8965 8966 if (FD->isInvalidDecl()) 8967 return true; 8968 8969 QualType EltTy = Context.getBaseElementType(FD->getType()); 8970 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8971 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8972 if (RDecl->getDefinition()) { 8973 // We check for copy constructors before constructors 8974 // because otherwise we'll never get complaints about 8975 // copy constructors. 8976 8977 CXXSpecialMember member = CXXInvalid; 8978 if (!RDecl->hasTrivialCopyConstructor()) 8979 member = CXXCopyConstructor; 8980 else if (!RDecl->hasTrivialDefaultConstructor()) 8981 member = CXXDefaultConstructor; 8982 else if (!RDecl->hasTrivialCopyAssignment()) 8983 member = CXXCopyAssignment; 8984 else if (!RDecl->hasTrivialDestructor()) 8985 member = CXXDestructor; 8986 8987 if (member != CXXInvalid) { 8988 if (!getLangOptions().CPlusPlus0x && 8989 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8990 // Objective-C++ ARC: it is an error to have a non-trivial field of 8991 // a union. However, system headers in Objective-C programs 8992 // occasionally have Objective-C lifetime objects within unions, 8993 // and rather than cause the program to fail, we make those 8994 // members unavailable. 8995 SourceLocation Loc = FD->getLocation(); 8996 if (getSourceManager().isInSystemHeader(Loc)) { 8997 if (!FD->hasAttr<UnavailableAttr>()) 8998 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8999 "this system field has retaining ownership")); 9000 return false; 9001 } 9002 } 9003 9004 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 9005 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 9006 diag::err_illegal_union_or_anon_struct_member) 9007 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 9008 DiagnoseNontrivial(RT, member); 9009 return !getLangOptions().CPlusPlus0x; 9010 } 9011 } 9012 } 9013 9014 return false; 9015} 9016 9017/// If the given constructor is user-provided, produce a diagnostic explaining 9018/// that it makes the class non-trivial. 9019static bool DiagnoseNontrivialUserProvidedCtor(Sema &S, QualType QT, 9020 CXXConstructorDecl *CD, 9021 Sema::CXXSpecialMember CSM) { 9022 if (!CD->isUserProvided()) 9023 return false; 9024 9025 SourceLocation CtorLoc = CD->getLocation(); 9026 S.Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << CSM; 9027 return true; 9028} 9029 9030/// DiagnoseNontrivial - Given that a class has a non-trivial 9031/// special member, figure out why. 9032void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 9033 QualType QT(T, 0U); 9034 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 9035 9036 // Check whether the member was user-declared. 9037 switch (member) { 9038 case CXXInvalid: 9039 break; 9040 9041 case CXXDefaultConstructor: 9042 if (RD->hasUserDeclaredConstructor()) { 9043 typedef CXXRecordDecl::ctor_iterator ctor_iter; 9044 for (ctor_iter CI = RD->ctor_begin(), CE = RD->ctor_end(); CI != CE; ++CI) 9045 if (DiagnoseNontrivialUserProvidedCtor(*this, QT, *CI, member)) 9046 return; 9047 9048 // No user-provided constructors; look for constructor templates. 9049 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 9050 tmpl_iter; 9051 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); 9052 TI != TE; ++TI) { 9053 CXXConstructorDecl *CD = 9054 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl()); 9055 if (CD && DiagnoseNontrivialUserProvidedCtor(*this, QT, CD, member)) 9056 return; 9057 } 9058 } 9059 break; 9060 9061 case CXXCopyConstructor: 9062 if (RD->hasUserDeclaredCopyConstructor()) { 9063 SourceLocation CtorLoc = 9064 RD->getCopyConstructor(0)->getLocation(); 9065 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9066 return; 9067 } 9068 break; 9069 9070 case CXXMoveConstructor: 9071 if (RD->hasUserDeclaredMoveConstructor()) { 9072 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 9073 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9074 return; 9075 } 9076 break; 9077 9078 case CXXCopyAssignment: 9079 if (RD->hasUserDeclaredCopyAssignment()) { 9080 // FIXME: this should use the location of the copy 9081 // assignment, not the type. 9082 SourceLocation TyLoc = RD->getLocStart(); 9083 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 9084 return; 9085 } 9086 break; 9087 9088 case CXXMoveAssignment: 9089 if (RD->hasUserDeclaredMoveAssignment()) { 9090 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 9091 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 9092 return; 9093 } 9094 break; 9095 9096 case CXXDestructor: 9097 if (RD->hasUserDeclaredDestructor()) { 9098 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 9099 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 9100 return; 9101 } 9102 break; 9103 } 9104 9105 typedef CXXRecordDecl::base_class_iterator base_iter; 9106 9107 // Virtual bases and members inhibit trivial copying/construction, 9108 // but not trivial destruction. 9109 if (member != CXXDestructor) { 9110 // Check for virtual bases. vbases includes indirect virtual bases, 9111 // so we just iterate through the direct bases. 9112 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 9113 if (bi->isVirtual()) { 9114 SourceLocation BaseLoc = bi->getLocStart(); 9115 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 9116 return; 9117 } 9118 9119 // Check for virtual methods. 9120 typedef CXXRecordDecl::method_iterator meth_iter; 9121 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 9122 ++mi) { 9123 if (mi->isVirtual()) { 9124 SourceLocation MLoc = mi->getLocStart(); 9125 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 9126 return; 9127 } 9128 } 9129 } 9130 9131 bool (CXXRecordDecl::*hasTrivial)() const; 9132 switch (member) { 9133 case CXXDefaultConstructor: 9134 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 9135 case CXXCopyConstructor: 9136 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 9137 case CXXCopyAssignment: 9138 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 9139 case CXXDestructor: 9140 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 9141 default: 9142 llvm_unreachable("unexpected special member"); 9143 } 9144 9145 // Check for nontrivial bases (and recurse). 9146 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 9147 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 9148 assert(BaseRT && "Don't know how to handle dependent bases"); 9149 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 9150 if (!(BaseRecTy->*hasTrivial)()) { 9151 SourceLocation BaseLoc = bi->getLocStart(); 9152 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 9153 DiagnoseNontrivial(BaseRT, member); 9154 return; 9155 } 9156 } 9157 9158 // Check for nontrivial members (and recurse). 9159 typedef RecordDecl::field_iterator field_iter; 9160 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 9161 ++fi) { 9162 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 9163 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 9164 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 9165 9166 if (!(EltRD->*hasTrivial)()) { 9167 SourceLocation FLoc = (*fi)->getLocation(); 9168 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 9169 DiagnoseNontrivial(EltRT, member); 9170 return; 9171 } 9172 } 9173 9174 if (EltTy->isObjCLifetimeType()) { 9175 switch (EltTy.getObjCLifetime()) { 9176 case Qualifiers::OCL_None: 9177 case Qualifiers::OCL_ExplicitNone: 9178 break; 9179 9180 case Qualifiers::OCL_Autoreleasing: 9181 case Qualifiers::OCL_Weak: 9182 case Qualifiers::OCL_Strong: 9183 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 9184 << QT << EltTy.getObjCLifetime(); 9185 return; 9186 } 9187 } 9188 } 9189 9190 llvm_unreachable("found no explanation for non-trivial member"); 9191} 9192 9193/// TranslateIvarVisibility - Translate visibility from a token ID to an 9194/// AST enum value. 9195static ObjCIvarDecl::AccessControl 9196TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 9197 switch (ivarVisibility) { 9198 default: llvm_unreachable("Unknown visitibility kind"); 9199 case tok::objc_private: return ObjCIvarDecl::Private; 9200 case tok::objc_public: return ObjCIvarDecl::Public; 9201 case tok::objc_protected: return ObjCIvarDecl::Protected; 9202 case tok::objc_package: return ObjCIvarDecl::Package; 9203 } 9204} 9205 9206/// ActOnIvar - Each ivar field of an objective-c class is passed into this 9207/// in order to create an IvarDecl object for it. 9208Decl *Sema::ActOnIvar(Scope *S, 9209 SourceLocation DeclStart, 9210 Declarator &D, Expr *BitfieldWidth, 9211 tok::ObjCKeywordKind Visibility) { 9212 9213 IdentifierInfo *II = D.getIdentifier(); 9214 Expr *BitWidth = (Expr*)BitfieldWidth; 9215 SourceLocation Loc = DeclStart; 9216 if (II) Loc = D.getIdentifierLoc(); 9217 9218 // FIXME: Unnamed fields can be handled in various different ways, for 9219 // example, unnamed unions inject all members into the struct namespace! 9220 9221 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9222 QualType T = TInfo->getType(); 9223 9224 if (BitWidth) { 9225 // 6.7.2.1p3, 6.7.2.1p4 9226 BitWidth = VerifyBitField(Loc, II, T, BitWidth).take(); 9227 if (!BitWidth) 9228 D.setInvalidType(); 9229 } else { 9230 // Not a bitfield. 9231 9232 // validate II. 9233 9234 } 9235 if (T->isReferenceType()) { 9236 Diag(Loc, diag::err_ivar_reference_type); 9237 D.setInvalidType(); 9238 } 9239 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9240 // than a variably modified type. 9241 else if (T->isVariablyModifiedType()) { 9242 Diag(Loc, diag::err_typecheck_ivar_variable_size); 9243 D.setInvalidType(); 9244 } 9245 9246 // Get the visibility (access control) for this ivar. 9247 ObjCIvarDecl::AccessControl ac = 9248 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 9249 : ObjCIvarDecl::None; 9250 // Must set ivar's DeclContext to its enclosing interface. 9251 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 9252 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl()) 9253 return 0; 9254 ObjCContainerDecl *EnclosingContext; 9255 if (ObjCImplementationDecl *IMPDecl = 9256 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9257 if (!LangOpts.ObjCNonFragileABI2) { 9258 // Case of ivar declared in an implementation. Context is that of its class. 9259 EnclosingContext = IMPDecl->getClassInterface(); 9260 assert(EnclosingContext && "Implementation has no class interface!"); 9261 } 9262 else 9263 EnclosingContext = EnclosingDecl; 9264 } else { 9265 if (ObjCCategoryDecl *CDecl = 9266 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9267 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 9268 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 9269 return 0; 9270 } 9271 } 9272 EnclosingContext = EnclosingDecl; 9273 } 9274 9275 // Construct the decl. 9276 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 9277 DeclStart, Loc, II, T, 9278 TInfo, ac, (Expr *)BitfieldWidth); 9279 9280 if (II) { 9281 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 9282 ForRedeclaration); 9283 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9284 && !isa<TagDecl>(PrevDecl)) { 9285 Diag(Loc, diag::err_duplicate_member) << II; 9286 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9287 NewID->setInvalidDecl(); 9288 } 9289 } 9290 9291 // Process attributes attached to the ivar. 9292 ProcessDeclAttributes(S, NewID, D); 9293 9294 if (D.isInvalidType()) 9295 NewID->setInvalidDecl(); 9296 9297 // In ARC, infer 'retaining' for ivars of retainable type. 9298 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9299 NewID->setInvalidDecl(); 9300 9301 if (D.getDeclSpec().isModulePrivateSpecified()) 9302 NewID->setModulePrivate(); 9303 9304 if (II) { 9305 // FIXME: When interfaces are DeclContexts, we'll need to add 9306 // these to the interface. 9307 S->AddDecl(NewID); 9308 IdResolver.AddDecl(NewID); 9309 } 9310 9311 return NewID; 9312} 9313 9314/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9315/// class and class extensions. For every class @interface and class 9316/// extension @interface, if the last ivar is a bitfield of any type, 9317/// then add an implicit `char :0` ivar to the end of that interface. 9318void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9319 SmallVectorImpl<Decl *> &AllIvarDecls) { 9320 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9321 return; 9322 9323 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9324 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9325 9326 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9327 return; 9328 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9329 if (!ID) { 9330 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9331 if (!CD->IsClassExtension()) 9332 return; 9333 } 9334 // No need to add this to end of @implementation. 9335 else 9336 return; 9337 } 9338 // All conditions are met. Add a new bitfield to the tail end of ivars. 9339 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9340 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9341 9342 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9343 DeclLoc, DeclLoc, 0, 9344 Context.CharTy, 9345 Context.getTrivialTypeSourceInfo(Context.CharTy, 9346 DeclLoc), 9347 ObjCIvarDecl::Private, BW, 9348 true); 9349 AllIvarDecls.push_back(Ivar); 9350} 9351 9352void Sema::ActOnFields(Scope* S, 9353 SourceLocation RecLoc, Decl *EnclosingDecl, 9354 llvm::ArrayRef<Decl *> Fields, 9355 SourceLocation LBrac, SourceLocation RBrac, 9356 AttributeList *Attr) { 9357 assert(EnclosingDecl && "missing record or interface decl"); 9358 9359 // If the decl this is being inserted into is invalid, then it may be a 9360 // redeclaration or some other bogus case. Don't try to add fields to it. 9361 if (EnclosingDecl->isInvalidDecl()) 9362 return; 9363 9364 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9365 9366 // Start counting up the number of named members; make sure to include 9367 // members of anonymous structs and unions in the total. 9368 unsigned NumNamedMembers = 0; 9369 if (Record) { 9370 for (RecordDecl::decl_iterator i = Record->decls_begin(), 9371 e = Record->decls_end(); i != e; i++) { 9372 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*i)) 9373 if (IFD->getDeclName()) 9374 ++NumNamedMembers; 9375 } 9376 } 9377 9378 // Verify that all the fields are okay. 9379 SmallVector<FieldDecl*, 32> RecFields; 9380 9381 bool ARCErrReported = false; 9382 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9383 i != end; ++i) { 9384 FieldDecl *FD = cast<FieldDecl>(*i); 9385 9386 // Get the type for the field. 9387 const Type *FDTy = FD->getType().getTypePtr(); 9388 9389 if (!FD->isAnonymousStructOrUnion()) { 9390 // Remember all fields written by the user. 9391 RecFields.push_back(FD); 9392 } 9393 9394 // If the field is already invalid for some reason, don't emit more 9395 // diagnostics about it. 9396 if (FD->isInvalidDecl()) { 9397 EnclosingDecl->setInvalidDecl(); 9398 continue; 9399 } 9400 9401 // C99 6.7.2.1p2: 9402 // A structure or union shall not contain a member with 9403 // incomplete or function type (hence, a structure shall not 9404 // contain an instance of itself, but may contain a pointer to 9405 // an instance of itself), except that the last member of a 9406 // structure with more than one named member may have incomplete 9407 // array type; such a structure (and any union containing, 9408 // possibly recursively, a member that is such a structure) 9409 // shall not be a member of a structure or an element of an 9410 // array. 9411 if (FDTy->isFunctionType()) { 9412 // Field declared as a function. 9413 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9414 << FD->getDeclName(); 9415 FD->setInvalidDecl(); 9416 EnclosingDecl->setInvalidDecl(); 9417 continue; 9418 } else if (FDTy->isIncompleteArrayType() && Record && 9419 ((i + 1 == Fields.end() && !Record->isUnion()) || 9420 ((getLangOptions().MicrosoftExt || 9421 getLangOptions().CPlusPlus) && 9422 (i + 1 == Fields.end() || Record->isUnion())))) { 9423 // Flexible array member. 9424 // Microsoft and g++ is more permissive regarding flexible array. 9425 // It will accept flexible array in union and also 9426 // as the sole element of a struct/class. 9427 if (getLangOptions().MicrosoftExt) { 9428 if (Record->isUnion()) 9429 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9430 << FD->getDeclName(); 9431 else if (Fields.size() == 1) 9432 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9433 << FD->getDeclName() << Record->getTagKind(); 9434 } else if (getLangOptions().CPlusPlus) { 9435 if (Record->isUnion()) 9436 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9437 << FD->getDeclName(); 9438 else if (Fields.size() == 1) 9439 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9440 << FD->getDeclName() << Record->getTagKind(); 9441 } else if (NumNamedMembers < 1) { 9442 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9443 << FD->getDeclName(); 9444 FD->setInvalidDecl(); 9445 EnclosingDecl->setInvalidDecl(); 9446 continue; 9447 } 9448 if (!FD->getType()->isDependentType() && 9449 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9450 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9451 << FD->getDeclName() << FD->getType(); 9452 FD->setInvalidDecl(); 9453 EnclosingDecl->setInvalidDecl(); 9454 continue; 9455 } 9456 // Okay, we have a legal flexible array member at the end of the struct. 9457 if (Record) 9458 Record->setHasFlexibleArrayMember(true); 9459 } else if (!FDTy->isDependentType() && 9460 RequireCompleteType(FD->getLocation(), FD->getType(), 9461 diag::err_field_incomplete)) { 9462 // Incomplete type 9463 FD->setInvalidDecl(); 9464 EnclosingDecl->setInvalidDecl(); 9465 continue; 9466 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9467 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9468 // If this is a member of a union, then entire union becomes "flexible". 9469 if (Record && Record->isUnion()) { 9470 Record->setHasFlexibleArrayMember(true); 9471 } else { 9472 // If this is a struct/class and this is not the last element, reject 9473 // it. Note that GCC supports variable sized arrays in the middle of 9474 // structures. 9475 if (i + 1 != Fields.end()) 9476 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9477 << FD->getDeclName() << FD->getType(); 9478 else { 9479 // We support flexible arrays at the end of structs in 9480 // other structs as an extension. 9481 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9482 << FD->getDeclName(); 9483 if (Record) 9484 Record->setHasFlexibleArrayMember(true); 9485 } 9486 } 9487 } 9488 if (Record && FDTTy->getDecl()->hasObjectMember()) 9489 Record->setHasObjectMember(true); 9490 } else if (FDTy->isObjCObjectType()) { 9491 /// A field cannot be an Objective-c object 9492 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9493 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9494 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9495 FD->setType(T); 9496 } 9497 else if (!getLangOptions().CPlusPlus) { 9498 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9499 // It's an error in ARC if a field has lifetime. 9500 // We don't want to report this in a system header, though, 9501 // so we just make the field unavailable. 9502 // FIXME: that's really not sufficient; we need to make the type 9503 // itself invalid to, say, initialize or copy. 9504 QualType T = FD->getType(); 9505 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9506 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9507 SourceLocation loc = FD->getLocation(); 9508 if (getSourceManager().isInSystemHeader(loc)) { 9509 if (!FD->hasAttr<UnavailableAttr>()) { 9510 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9511 "this system field has retaining ownership")); 9512 } 9513 } else { 9514 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9515 << T->isBlockPointerType(); 9516 } 9517 ARCErrReported = true; 9518 } 9519 } 9520 else if (getLangOptions().ObjC1 && 9521 getLangOptions().getGC() != LangOptions::NonGC && 9522 Record && !Record->hasObjectMember()) { 9523 if (FD->getType()->isObjCObjectPointerType() || 9524 FD->getType().isObjCGCStrong()) 9525 Record->setHasObjectMember(true); 9526 else if (Context.getAsArrayType(FD->getType())) { 9527 QualType BaseType = Context.getBaseElementType(FD->getType()); 9528 if (BaseType->isRecordType() && 9529 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9530 Record->setHasObjectMember(true); 9531 else if (BaseType->isObjCObjectPointerType() || 9532 BaseType.isObjCGCStrong()) 9533 Record->setHasObjectMember(true); 9534 } 9535 } 9536 } 9537 // Keep track of the number of named members. 9538 if (FD->getIdentifier()) 9539 ++NumNamedMembers; 9540 } 9541 9542 // Okay, we successfully defined 'Record'. 9543 if (Record) { 9544 bool Completed = false; 9545 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9546 if (!CXXRecord->isInvalidDecl()) { 9547 // Set access bits correctly on the directly-declared conversions. 9548 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9549 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9550 I != E; ++I) 9551 Convs->setAccess(I, (*I)->getAccess()); 9552 9553 if (!CXXRecord->isDependentType()) { 9554 // Objective-C Automatic Reference Counting: 9555 // If a class has a non-static data member of Objective-C pointer 9556 // type (or array thereof), it is a non-POD type and its 9557 // default constructor (if any), copy constructor, copy assignment 9558 // operator, and destructor are non-trivial. 9559 // 9560 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9561 // However, here we check whether this particular class is only 9562 // non-POD because of the presence of an Objective-C pointer member. 9563 // If so, objects of this type cannot be shared between code compiled 9564 // with instant objects and code compiled with manual retain/release. 9565 if (getLangOptions().ObjCAutoRefCount && 9566 CXXRecord->hasObjectMember() && 9567 CXXRecord->getLinkage() == ExternalLinkage) { 9568 if (CXXRecord->isPOD()) { 9569 Diag(CXXRecord->getLocation(), 9570 diag::warn_arc_non_pod_class_with_object_member) 9571 << CXXRecord; 9572 } else { 9573 // FIXME: Fix-Its would be nice here, but finding a good location 9574 // for them is going to be tricky. 9575 if (CXXRecord->hasTrivialCopyConstructor()) 9576 Diag(CXXRecord->getLocation(), 9577 diag::warn_arc_trivial_member_function_with_object_member) 9578 << CXXRecord << 0; 9579 if (CXXRecord->hasTrivialCopyAssignment()) 9580 Diag(CXXRecord->getLocation(), 9581 diag::warn_arc_trivial_member_function_with_object_member) 9582 << CXXRecord << 1; 9583 if (CXXRecord->hasTrivialDestructor()) 9584 Diag(CXXRecord->getLocation(), 9585 diag::warn_arc_trivial_member_function_with_object_member) 9586 << CXXRecord << 2; 9587 } 9588 } 9589 9590 // Adjust user-defined destructor exception spec. 9591 if (getLangOptions().CPlusPlus0x && 9592 CXXRecord->hasUserDeclaredDestructor()) 9593 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9594 9595 // Add any implicitly-declared members to this class. 9596 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9597 9598 // If we have virtual base classes, we may end up finding multiple 9599 // final overriders for a given virtual function. Check for this 9600 // problem now. 9601 if (CXXRecord->getNumVBases()) { 9602 CXXFinalOverriderMap FinalOverriders; 9603 CXXRecord->getFinalOverriders(FinalOverriders); 9604 9605 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9606 MEnd = FinalOverriders.end(); 9607 M != MEnd; ++M) { 9608 for (OverridingMethods::iterator SO = M->second.begin(), 9609 SOEnd = M->second.end(); 9610 SO != SOEnd; ++SO) { 9611 assert(SO->second.size() > 0 && 9612 "Virtual function without overridding functions?"); 9613 if (SO->second.size() == 1) 9614 continue; 9615 9616 // C++ [class.virtual]p2: 9617 // In a derived class, if a virtual member function of a base 9618 // class subobject has more than one final overrider the 9619 // program is ill-formed. 9620 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9621 << (NamedDecl *)M->first << Record; 9622 Diag(M->first->getLocation(), 9623 diag::note_overridden_virtual_function); 9624 for (OverridingMethods::overriding_iterator 9625 OM = SO->second.begin(), 9626 OMEnd = SO->second.end(); 9627 OM != OMEnd; ++OM) 9628 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9629 << (NamedDecl *)M->first << OM->Method->getParent(); 9630 9631 Record->setInvalidDecl(); 9632 } 9633 } 9634 CXXRecord->completeDefinition(&FinalOverriders); 9635 Completed = true; 9636 } 9637 } 9638 } 9639 } 9640 9641 if (!Completed) 9642 Record->completeDefinition(); 9643 9644 // Now that the record is complete, do any delayed exception spec checks 9645 // we were missing. 9646 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9647 const CXXDestructorDecl *Dtor = 9648 DelayedDestructorExceptionSpecChecks.back().first; 9649 if (Dtor->getParent() != Record) 9650 break; 9651 9652 assert(!Dtor->getParent()->isDependentType() && 9653 "Should not ever add destructors of templates into the list."); 9654 CheckOverridingFunctionExceptionSpec(Dtor, 9655 DelayedDestructorExceptionSpecChecks.back().second); 9656 DelayedDestructorExceptionSpecChecks.pop_back(); 9657 } 9658 9659 } else { 9660 ObjCIvarDecl **ClsFields = 9661 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9662 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9663 ID->setEndOfDefinitionLoc(RBrac); 9664 // Add ivar's to class's DeclContext. 9665 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9666 ClsFields[i]->setLexicalDeclContext(ID); 9667 ID->addDecl(ClsFields[i]); 9668 } 9669 // Must enforce the rule that ivars in the base classes may not be 9670 // duplicates. 9671 if (ID->getSuperClass()) 9672 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9673 } else if (ObjCImplementationDecl *IMPDecl = 9674 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9675 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9676 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9677 // Ivar declared in @implementation never belongs to the implementation. 9678 // Only it is in implementation's lexical context. 9679 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9680 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9681 IMPDecl->setIvarLBraceLoc(LBrac); 9682 IMPDecl->setIvarRBraceLoc(RBrac); 9683 } else if (ObjCCategoryDecl *CDecl = 9684 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9685 // case of ivars in class extension; all other cases have been 9686 // reported as errors elsewhere. 9687 // FIXME. Class extension does not have a LocEnd field. 9688 // CDecl->setLocEnd(RBrac); 9689 // Add ivar's to class extension's DeclContext. 9690 // Diagnose redeclaration of private ivars. 9691 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9692 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9693 if (IDecl) { 9694 if (const ObjCIvarDecl *ClsIvar = 9695 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9696 Diag(ClsFields[i]->getLocation(), 9697 diag::err_duplicate_ivar_declaration); 9698 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9699 continue; 9700 } 9701 for (const ObjCCategoryDecl *ClsExtDecl = 9702 IDecl->getFirstClassExtension(); 9703 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9704 if (const ObjCIvarDecl *ClsExtIvar = 9705 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9706 Diag(ClsFields[i]->getLocation(), 9707 diag::err_duplicate_ivar_declaration); 9708 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9709 continue; 9710 } 9711 } 9712 } 9713 ClsFields[i]->setLexicalDeclContext(CDecl); 9714 CDecl->addDecl(ClsFields[i]); 9715 } 9716 CDecl->setIvarLBraceLoc(LBrac); 9717 CDecl->setIvarRBraceLoc(RBrac); 9718 } 9719 } 9720 9721 if (Attr) 9722 ProcessDeclAttributeList(S, Record, Attr); 9723 9724 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9725 // set the visibility of this record. 9726 if (Record && !Record->getDeclContext()->isRecord()) 9727 AddPushedVisibilityAttribute(Record); 9728} 9729 9730/// \brief Determine whether the given integral value is representable within 9731/// the given type T. 9732static bool isRepresentableIntegerValue(ASTContext &Context, 9733 llvm::APSInt &Value, 9734 QualType T) { 9735 assert(T->isIntegralType(Context) && "Integral type required!"); 9736 unsigned BitWidth = Context.getIntWidth(T); 9737 9738 if (Value.isUnsigned() || Value.isNonNegative()) { 9739 if (T->isSignedIntegerOrEnumerationType()) 9740 --BitWidth; 9741 return Value.getActiveBits() <= BitWidth; 9742 } 9743 return Value.getMinSignedBits() <= BitWidth; 9744} 9745 9746// \brief Given an integral type, return the next larger integral type 9747// (or a NULL type of no such type exists). 9748static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9749 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9750 // enum checking below. 9751 assert(T->isIntegralType(Context) && "Integral type required!"); 9752 const unsigned NumTypes = 4; 9753 QualType SignedIntegralTypes[NumTypes] = { 9754 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9755 }; 9756 QualType UnsignedIntegralTypes[NumTypes] = { 9757 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9758 Context.UnsignedLongLongTy 9759 }; 9760 9761 unsigned BitWidth = Context.getTypeSize(T); 9762 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9763 : UnsignedIntegralTypes; 9764 for (unsigned I = 0; I != NumTypes; ++I) 9765 if (Context.getTypeSize(Types[I]) > BitWidth) 9766 return Types[I]; 9767 9768 return QualType(); 9769} 9770 9771EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9772 EnumConstantDecl *LastEnumConst, 9773 SourceLocation IdLoc, 9774 IdentifierInfo *Id, 9775 Expr *Val) { 9776 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9777 llvm::APSInt EnumVal(IntWidth); 9778 QualType EltTy; 9779 9780 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9781 Val = 0; 9782 9783 if (Val) 9784 Val = DefaultLvalueConversion(Val).take(); 9785 9786 if (Val) { 9787 if (Enum->isDependentType() || Val->isTypeDependent()) 9788 EltTy = Context.DependentTy; 9789 else { 9790 SourceLocation ExpLoc; 9791 if (getLangOptions().CPlusPlus0x && Enum->isFixed() && 9792 !getLangOptions().MicrosoftMode) { 9793 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the 9794 // constant-expression in the enumerator-definition shall be a converted 9795 // constant expression of the underlying type. 9796 EltTy = Enum->getIntegerType(); 9797 ExprResult Converted = 9798 CheckConvertedConstantExpression(Val, EltTy, EnumVal, 9799 CCEK_Enumerator); 9800 if (Converted.isInvalid()) 9801 Val = 0; 9802 else 9803 Val = Converted.take(); 9804 } else if (!Val->isValueDependent() && 9805 !(Val = VerifyIntegerConstantExpression(Val, 9806 &EnumVal).take())) { 9807 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9808 } else { 9809 if (Enum->isFixed()) { 9810 EltTy = Enum->getIntegerType(); 9811 9812 // In Obj-C and Microsoft mode, require the enumeration value to be 9813 // representable in the underlying type of the enumeration. In C++11, 9814 // we perform a non-narrowing conversion as part of converted constant 9815 // expression checking. 9816 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9817 if (getLangOptions().MicrosoftMode) { 9818 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9819 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9820 } else 9821 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy; 9822 } else 9823 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9824 } else if (getLangOptions().CPlusPlus) { 9825 // C++11 [dcl.enum]p5: 9826 // If the underlying type is not fixed, the type of each enumerator 9827 // is the type of its initializing value: 9828 // - If an initializer is specified for an enumerator, the 9829 // initializing value has the same type as the expression. 9830 EltTy = Val->getType(); 9831 } else { 9832 // C99 6.7.2.2p2: 9833 // The expression that defines the value of an enumeration constant 9834 // shall be an integer constant expression that has a value 9835 // representable as an int. 9836 9837 // Complain if the value is not representable in an int. 9838 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9839 Diag(IdLoc, diag::ext_enum_value_not_int) 9840 << EnumVal.toString(10) << Val->getSourceRange() 9841 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9842 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9843 // Force the type of the expression to 'int'. 9844 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9845 } 9846 EltTy = Val->getType(); 9847 } 9848 } 9849 } 9850 } 9851 9852 if (!Val) { 9853 if (Enum->isDependentType()) 9854 EltTy = Context.DependentTy; 9855 else if (!LastEnumConst) { 9856 // C++0x [dcl.enum]p5: 9857 // If the underlying type is not fixed, the type of each enumerator 9858 // is the type of its initializing value: 9859 // - If no initializer is specified for the first enumerator, the 9860 // initializing value has an unspecified integral type. 9861 // 9862 // GCC uses 'int' for its unspecified integral type, as does 9863 // C99 6.7.2.2p3. 9864 if (Enum->isFixed()) { 9865 EltTy = Enum->getIntegerType(); 9866 } 9867 else { 9868 EltTy = Context.IntTy; 9869 } 9870 } else { 9871 // Assign the last value + 1. 9872 EnumVal = LastEnumConst->getInitVal(); 9873 ++EnumVal; 9874 EltTy = LastEnumConst->getType(); 9875 9876 // Check for overflow on increment. 9877 if (EnumVal < LastEnumConst->getInitVal()) { 9878 // C++0x [dcl.enum]p5: 9879 // If the underlying type is not fixed, the type of each enumerator 9880 // is the type of its initializing value: 9881 // 9882 // - Otherwise the type of the initializing value is the same as 9883 // the type of the initializing value of the preceding enumerator 9884 // unless the incremented value is not representable in that type, 9885 // in which case the type is an unspecified integral type 9886 // sufficient to contain the incremented value. If no such type 9887 // exists, the program is ill-formed. 9888 QualType T = getNextLargerIntegralType(Context, EltTy); 9889 if (T.isNull() || Enum->isFixed()) { 9890 // There is no integral type larger enough to represent this 9891 // value. Complain, then allow the value to wrap around. 9892 EnumVal = LastEnumConst->getInitVal(); 9893 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9894 ++EnumVal; 9895 if (Enum->isFixed()) 9896 // When the underlying type is fixed, this is ill-formed. 9897 Diag(IdLoc, diag::err_enumerator_wrapped) 9898 << EnumVal.toString(10) 9899 << EltTy; 9900 else 9901 Diag(IdLoc, diag::warn_enumerator_too_large) 9902 << EnumVal.toString(10); 9903 } else { 9904 EltTy = T; 9905 } 9906 9907 // Retrieve the last enumerator's value, extent that type to the 9908 // type that is supposed to be large enough to represent the incremented 9909 // value, then increment. 9910 EnumVal = LastEnumConst->getInitVal(); 9911 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9912 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9913 ++EnumVal; 9914 9915 // If we're not in C++, diagnose the overflow of enumerator values, 9916 // which in C99 means that the enumerator value is not representable in 9917 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9918 // permits enumerator values that are representable in some larger 9919 // integral type. 9920 if (!getLangOptions().CPlusPlus && !T.isNull()) 9921 Diag(IdLoc, diag::warn_enum_value_overflow); 9922 } else if (!getLangOptions().CPlusPlus && 9923 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9924 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9925 Diag(IdLoc, diag::ext_enum_value_not_int) 9926 << EnumVal.toString(10) << 1; 9927 } 9928 } 9929 } 9930 9931 if (!EltTy->isDependentType()) { 9932 // Make the enumerator value match the signedness and size of the 9933 // enumerator's type. 9934 EnumVal = EnumVal.extOrTrunc(Context.getIntWidth(EltTy)); 9935 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9936 } 9937 9938 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9939 Val, EnumVal); 9940} 9941 9942 9943Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9944 SourceLocation IdLoc, IdentifierInfo *Id, 9945 AttributeList *Attr, 9946 SourceLocation EqualLoc, Expr *Val) { 9947 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9948 EnumConstantDecl *LastEnumConst = 9949 cast_or_null<EnumConstantDecl>(lastEnumConst); 9950 9951 // The scope passed in may not be a decl scope. Zip up the scope tree until 9952 // we find one that is. 9953 S = getNonFieldDeclScope(S); 9954 9955 // Verify that there isn't already something declared with this name in this 9956 // scope. 9957 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9958 ForRedeclaration); 9959 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9960 // Maybe we will complain about the shadowed template parameter. 9961 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9962 // Just pretend that we didn't see the previous declaration. 9963 PrevDecl = 0; 9964 } 9965 9966 if (PrevDecl) { 9967 // When in C++, we may get a TagDecl with the same name; in this case the 9968 // enum constant will 'hide' the tag. 9969 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9970 "Received TagDecl when not in C++!"); 9971 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9972 if (isa<EnumConstantDecl>(PrevDecl)) 9973 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9974 else 9975 Diag(IdLoc, diag::err_redefinition) << Id; 9976 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9977 return 0; 9978 } 9979 } 9980 9981 // C++ [class.mem]p13: 9982 // If T is the name of a class, then each of the following shall have a 9983 // name different from T: 9984 // - every enumerator of every member of class T that is an enumerated 9985 // type 9986 if (CXXRecordDecl *Record 9987 = dyn_cast<CXXRecordDecl>( 9988 TheEnumDecl->getDeclContext()->getRedeclContext())) 9989 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9990 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9991 9992 EnumConstantDecl *New = 9993 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9994 9995 if (New) { 9996 // Process attributes. 9997 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9998 9999 // Register this decl in the current scope stack. 10000 New->setAccess(TheEnumDecl->getAccess()); 10001 PushOnScopeChains(New, S); 10002 } 10003 10004 return New; 10005} 10006 10007void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 10008 SourceLocation RBraceLoc, Decl *EnumDeclX, 10009 Decl **Elements, unsigned NumElements, 10010 Scope *S, AttributeList *Attr) { 10011 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 10012 QualType EnumType = Context.getTypeDeclType(Enum); 10013 10014 if (Attr) 10015 ProcessDeclAttributeList(S, Enum, Attr); 10016 10017 if (Enum->isDependentType()) { 10018 for (unsigned i = 0; i != NumElements; ++i) { 10019 EnumConstantDecl *ECD = 10020 cast_or_null<EnumConstantDecl>(Elements[i]); 10021 if (!ECD) continue; 10022 10023 ECD->setType(EnumType); 10024 } 10025 10026 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 10027 return; 10028 } 10029 10030 // TODO: If the result value doesn't fit in an int, it must be a long or long 10031 // long value. ISO C does not support this, but GCC does as an extension, 10032 // emit a warning. 10033 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 10034 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 10035 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 10036 10037 // Verify that all the values are okay, compute the size of the values, and 10038 // reverse the list. 10039 unsigned NumNegativeBits = 0; 10040 unsigned NumPositiveBits = 0; 10041 10042 // Keep track of whether all elements have type int. 10043 bool AllElementsInt = true; 10044 10045 for (unsigned i = 0; i != NumElements; ++i) { 10046 EnumConstantDecl *ECD = 10047 cast_or_null<EnumConstantDecl>(Elements[i]); 10048 if (!ECD) continue; // Already issued a diagnostic. 10049 10050 const llvm::APSInt &InitVal = ECD->getInitVal(); 10051 10052 // Keep track of the size of positive and negative values. 10053 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 10054 NumPositiveBits = std::max(NumPositiveBits, 10055 (unsigned)InitVal.getActiveBits()); 10056 else 10057 NumNegativeBits = std::max(NumNegativeBits, 10058 (unsigned)InitVal.getMinSignedBits()); 10059 10060 // Keep track of whether every enum element has type int (very commmon). 10061 if (AllElementsInt) 10062 AllElementsInt = ECD->getType() == Context.IntTy; 10063 } 10064 10065 // Figure out the type that should be used for this enum. 10066 QualType BestType; 10067 unsigned BestWidth; 10068 10069 // C++0x N3000 [conv.prom]p3: 10070 // An rvalue of an unscoped enumeration type whose underlying 10071 // type is not fixed can be converted to an rvalue of the first 10072 // of the following types that can represent all the values of 10073 // the enumeration: int, unsigned int, long int, unsigned long 10074 // int, long long int, or unsigned long long int. 10075 // C99 6.4.4.3p2: 10076 // An identifier declared as an enumeration constant has type int. 10077 // The C99 rule is modified by a gcc extension 10078 QualType BestPromotionType; 10079 10080 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 10081 // -fshort-enums is the equivalent to specifying the packed attribute on all 10082 // enum definitions. 10083 if (LangOpts.ShortEnums) 10084 Packed = true; 10085 10086 if (Enum->isFixed()) { 10087 BestType = Enum->getIntegerType(); 10088 if (BestType->isPromotableIntegerType()) 10089 BestPromotionType = Context.getPromotedIntegerType(BestType); 10090 else 10091 BestPromotionType = BestType; 10092 // We don't need to set BestWidth, because BestType is going to be the type 10093 // of the enumerators, but we do anyway because otherwise some compilers 10094 // warn that it might be used uninitialized. 10095 BestWidth = CharWidth; 10096 } 10097 else if (NumNegativeBits) { 10098 // If there is a negative value, figure out the smallest integer type (of 10099 // int/long/longlong) that fits. 10100 // If it's packed, check also if it fits a char or a short. 10101 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 10102 BestType = Context.SignedCharTy; 10103 BestWidth = CharWidth; 10104 } else if (Packed && NumNegativeBits <= ShortWidth && 10105 NumPositiveBits < ShortWidth) { 10106 BestType = Context.ShortTy; 10107 BestWidth = ShortWidth; 10108 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 10109 BestType = Context.IntTy; 10110 BestWidth = IntWidth; 10111 } else { 10112 BestWidth = Context.getTargetInfo().getLongWidth(); 10113 10114 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 10115 BestType = Context.LongTy; 10116 } else { 10117 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10118 10119 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 10120 Diag(Enum->getLocation(), diag::warn_enum_too_large); 10121 BestType = Context.LongLongTy; 10122 } 10123 } 10124 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 10125 } else { 10126 // If there is no negative value, figure out the smallest type that fits 10127 // all of the enumerator values. 10128 // If it's packed, check also if it fits a char or a short. 10129 if (Packed && NumPositiveBits <= CharWidth) { 10130 BestType = Context.UnsignedCharTy; 10131 BestPromotionType = Context.IntTy; 10132 BestWidth = CharWidth; 10133 } else if (Packed && NumPositiveBits <= ShortWidth) { 10134 BestType = Context.UnsignedShortTy; 10135 BestPromotionType = Context.IntTy; 10136 BestWidth = ShortWidth; 10137 } else if (NumPositiveBits <= IntWidth) { 10138 BestType = Context.UnsignedIntTy; 10139 BestWidth = IntWidth; 10140 BestPromotionType 10141 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 10142 ? Context.UnsignedIntTy : Context.IntTy; 10143 } else if (NumPositiveBits <= 10144 (BestWidth = Context.getTargetInfo().getLongWidth())) { 10145 BestType = Context.UnsignedLongTy; 10146 BestPromotionType 10147 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 10148 ? Context.UnsignedLongTy : Context.LongTy; 10149 } else { 10150 BestWidth = Context.getTargetInfo().getLongLongWidth(); 10151 assert(NumPositiveBits <= BestWidth && 10152 "How could an initializer get larger than ULL?"); 10153 BestType = Context.UnsignedLongLongTy; 10154 BestPromotionType 10155 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 10156 ? Context.UnsignedLongLongTy : Context.LongLongTy; 10157 } 10158 } 10159 10160 // Loop over all of the enumerator constants, changing their types to match 10161 // the type of the enum if needed. 10162 for (unsigned i = 0; i != NumElements; ++i) { 10163 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 10164 if (!ECD) continue; // Already issued a diagnostic. 10165 10166 // Standard C says the enumerators have int type, but we allow, as an 10167 // extension, the enumerators to be larger than int size. If each 10168 // enumerator value fits in an int, type it as an int, otherwise type it the 10169 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 10170 // that X has type 'int', not 'unsigned'. 10171 10172 // Determine whether the value fits into an int. 10173 llvm::APSInt InitVal = ECD->getInitVal(); 10174 10175 // If it fits into an integer type, force it. Otherwise force it to match 10176 // the enum decl type. 10177 QualType NewTy; 10178 unsigned NewWidth; 10179 bool NewSign; 10180 if (!getLangOptions().CPlusPlus && 10181 !Enum->isFixed() && 10182 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 10183 NewTy = Context.IntTy; 10184 NewWidth = IntWidth; 10185 NewSign = true; 10186 } else if (ECD->getType() == BestType) { 10187 // Already the right type! 10188 if (getLangOptions().CPlusPlus) 10189 // C++ [dcl.enum]p4: Following the closing brace of an 10190 // enum-specifier, each enumerator has the type of its 10191 // enumeration. 10192 ECD->setType(EnumType); 10193 continue; 10194 } else { 10195 NewTy = BestType; 10196 NewWidth = BestWidth; 10197 NewSign = BestType->isSignedIntegerOrEnumerationType(); 10198 } 10199 10200 // Adjust the APSInt value. 10201 InitVal = InitVal.extOrTrunc(NewWidth); 10202 InitVal.setIsSigned(NewSign); 10203 ECD->setInitVal(InitVal); 10204 10205 // Adjust the Expr initializer and type. 10206 if (ECD->getInitExpr() && 10207 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 10208 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 10209 CK_IntegralCast, 10210 ECD->getInitExpr(), 10211 /*base paths*/ 0, 10212 VK_RValue)); 10213 if (getLangOptions().CPlusPlus) 10214 // C++ [dcl.enum]p4: Following the closing brace of an 10215 // enum-specifier, each enumerator has the type of its 10216 // enumeration. 10217 ECD->setType(EnumType); 10218 else 10219 ECD->setType(NewTy); 10220 } 10221 10222 Enum->completeDefinition(BestType, BestPromotionType, 10223 NumPositiveBits, NumNegativeBits); 10224 10225 // If we're declaring a function, ensure this decl isn't forgotten about - 10226 // it needs to go into the function scope. 10227 if (InFunctionDeclarator) 10228 DeclsInPrototypeScope.push_back(Enum); 10229 10230} 10231 10232Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 10233 SourceLocation StartLoc, 10234 SourceLocation EndLoc) { 10235 StringLiteral *AsmString = cast<StringLiteral>(expr); 10236 10237 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 10238 AsmString, StartLoc, 10239 EndLoc); 10240 CurContext->addDecl(New); 10241 return New; 10242} 10243 10244DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 10245 SourceLocation ImportLoc, 10246 ModuleIdPath Path) { 10247 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 10248 Module::AllVisible, 10249 /*IsIncludeDirective=*/false); 10250 if (!Mod) 10251 return true; 10252 10253 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 10254 Module *ModCheck = Mod; 10255 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 10256 // If we've run out of module parents, just drop the remaining identifiers. 10257 // We need the length to be consistent. 10258 if (!ModCheck) 10259 break; 10260 ModCheck = ModCheck->Parent; 10261 10262 IdentifierLocs.push_back(Path[I].second); 10263 } 10264 10265 ImportDecl *Import = ImportDecl::Create(Context, 10266 Context.getTranslationUnitDecl(), 10267 AtLoc.isValid()? AtLoc : ImportLoc, 10268 Mod, IdentifierLocs); 10269 Context.getTranslationUnitDecl()->addDecl(Import); 10270 return Import; 10271} 10272 10273void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name, 10274 IdentifierInfo* AliasName, 10275 SourceLocation PragmaLoc, 10276 SourceLocation NameLoc, 10277 SourceLocation AliasNameLoc) { 10278 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, 10279 LookupOrdinaryName); 10280 AsmLabelAttr *Attr = 10281 ::new (Context) AsmLabelAttr(AliasNameLoc, Context, AliasName->getName()); 10282 10283 if (PrevDecl) 10284 PrevDecl->addAttr(Attr); 10285 else 10286 (void)ExtnameUndeclaredIdentifiers.insert( 10287 std::pair<IdentifierInfo*,AsmLabelAttr*>(Name, Attr)); 10288} 10289 10290void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 10291 SourceLocation PragmaLoc, 10292 SourceLocation NameLoc) { 10293 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 10294 10295 if (PrevDecl) { 10296 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 10297 } else { 10298 (void)WeakUndeclaredIdentifiers.insert( 10299 std::pair<IdentifierInfo*,WeakInfo> 10300 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 10301 } 10302} 10303 10304void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 10305 IdentifierInfo* AliasName, 10306 SourceLocation PragmaLoc, 10307 SourceLocation NameLoc, 10308 SourceLocation AliasNameLoc) { 10309 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 10310 LookupOrdinaryName); 10311 WeakInfo W = WeakInfo(Name, NameLoc); 10312 10313 if (PrevDecl) { 10314 if (!PrevDecl->hasAttr<AliasAttr>()) 10315 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 10316 DeclApplyPragmaWeak(TUScope, ND, W); 10317 } else { 10318 (void)WeakUndeclaredIdentifiers.insert( 10319 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 10320 } 10321} 10322 10323Decl *Sema::getObjCDeclContext() const { 10324 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 10325} 10326 10327AvailabilityResult Sema::getCurContextAvailability() const { 10328 const Decl *D = cast<Decl>(getCurLexicalContext()); 10329 // A category implicitly has the availability of the interface. 10330 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 10331 D = CatD->getClassInterface(); 10332 10333 return D->getAvailability(); 10334} 10335