SemaDecl.cpp revision c645ddf240efb112ff8f17371811deb3ebc1a5b5
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/Sema/CXXFieldCollector.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "TypeLocBuilder.h" 21#include "clang/AST/ASTConsumer.h" 22#include "clang/AST/ASTContext.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclCXX.h" 25#include "clang/AST/DeclObjC.h" 26#include "clang/AST/DeclTemplate.h" 27#include "clang/AST/EvaluatedExprVisitor.h" 28#include "clang/AST/ExprCXX.h" 29#include "clang/AST/StmtCXX.h" 30#include "clang/AST/CharUnits.h" 31#include "clang/Sema/DeclSpec.h" 32#include "clang/Sema/ParsedTemplate.h" 33#include "clang/Parse/ParseDiagnostic.h" 34#include "clang/Basic/PartialDiagnostic.h" 35#include "clang/Sema/DelayedDiagnostic.h" 36#include "clang/Basic/SourceManager.h" 37#include "clang/Basic/TargetInfo.h" 38// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 39#include "clang/Lex/Preprocessor.h" 40#include "clang/Lex/HeaderSearch.h" 41#include "clang/Lex/ModuleLoader.h" 42#include "llvm/ADT/Triple.h" 43#include <algorithm> 44#include <cstring> 45#include <functional> 46using namespace clang; 47using namespace sema; 48 49Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 50 if (OwnedType) { 51 Decl *Group[2] = { OwnedType, Ptr }; 52 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 53 } 54 55 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 56} 57 58namespace { 59 60class TypeNameValidatorCCC : public CorrectionCandidateCallback { 61 public: 62 TypeNameValidatorCCC(bool AllowInvalid) : AllowInvalidDecl(AllowInvalid) { 63 WantExpressionKeywords = false; 64 WantCXXNamedCasts = false; 65 WantRemainingKeywords = false; 66 } 67 68 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 69 if (NamedDecl *ND = candidate.getCorrectionDecl()) 70 return (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND)) && 71 (AllowInvalidDecl || !ND->isInvalidDecl()); 72 else 73 return candidate.isKeyword(); 74 } 75 76 private: 77 bool AllowInvalidDecl; 78}; 79 80} 81 82/// \brief If the identifier refers to a type name within this scope, 83/// return the declaration of that type. 84/// 85/// This routine performs ordinary name lookup of the identifier II 86/// within the given scope, with optional C++ scope specifier SS, to 87/// determine whether the name refers to a type. If so, returns an 88/// opaque pointer (actually a QualType) corresponding to that 89/// type. Otherwise, returns NULL. 90/// 91/// If name lookup results in an ambiguity, this routine will complain 92/// and then return NULL. 93ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 94 Scope *S, CXXScopeSpec *SS, 95 bool isClassName, bool HasTrailingDot, 96 ParsedType ObjectTypePtr, 97 bool IsCtorOrDtorName, 98 bool WantNontrivialTypeSourceInfo, 99 IdentifierInfo **CorrectedII) { 100 // Determine where we will perform name lookup. 101 DeclContext *LookupCtx = 0; 102 if (ObjectTypePtr) { 103 QualType ObjectType = ObjectTypePtr.get(); 104 if (ObjectType->isRecordType()) 105 LookupCtx = computeDeclContext(ObjectType); 106 } else if (SS && SS->isNotEmpty()) { 107 LookupCtx = computeDeclContext(*SS, false); 108 109 if (!LookupCtx) { 110 if (isDependentScopeSpecifier(*SS)) { 111 // C++ [temp.res]p3: 112 // A qualified-id that refers to a type and in which the 113 // nested-name-specifier depends on a template-parameter (14.6.2) 114 // shall be prefixed by the keyword typename to indicate that the 115 // qualified-id denotes a type, forming an 116 // elaborated-type-specifier (7.1.5.3). 117 // 118 // We therefore do not perform any name lookup if the result would 119 // refer to a member of an unknown specialization. 120 if (!isClassName) 121 return ParsedType(); 122 123 // We know from the grammar that this name refers to a type, 124 // so build a dependent node to describe the type. 125 if (WantNontrivialTypeSourceInfo) 126 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 127 128 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 129 QualType T = 130 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 131 II, NameLoc); 132 133 return ParsedType::make(T); 134 } 135 136 return ParsedType(); 137 } 138 139 if (!LookupCtx->isDependentContext() && 140 RequireCompleteDeclContext(*SS, LookupCtx)) 141 return ParsedType(); 142 } 143 144 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 145 // lookup for class-names. 146 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 147 LookupOrdinaryName; 148 LookupResult Result(*this, &II, NameLoc, Kind); 149 if (LookupCtx) { 150 // Perform "qualified" name lookup into the declaration context we 151 // computed, which is either the type of the base of a member access 152 // expression or the declaration context associated with a prior 153 // nested-name-specifier. 154 LookupQualifiedName(Result, LookupCtx); 155 156 if (ObjectTypePtr && Result.empty()) { 157 // C++ [basic.lookup.classref]p3: 158 // If the unqualified-id is ~type-name, the type-name is looked up 159 // in the context of the entire postfix-expression. If the type T of 160 // the object expression is of a class type C, the type-name is also 161 // looked up in the scope of class C. At least one of the lookups shall 162 // find a name that refers to (possibly cv-qualified) T. 163 LookupName(Result, S); 164 } 165 } else { 166 // Perform unqualified name lookup. 167 LookupName(Result, S); 168 } 169 170 NamedDecl *IIDecl = 0; 171 switch (Result.getResultKind()) { 172 case LookupResult::NotFound: 173 case LookupResult::NotFoundInCurrentInstantiation: 174 if (CorrectedII) { 175 TypeNameValidatorCCC Validator(true); 176 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), 177 Kind, S, SS, Validator); 178 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); 179 TemplateTy Template; 180 bool MemberOfUnknownSpecialization; 181 UnqualifiedId TemplateName; 182 TemplateName.setIdentifier(NewII, NameLoc); 183 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); 184 CXXScopeSpec NewSS, *NewSSPtr = SS; 185 if (SS && NNS) { 186 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); 187 NewSSPtr = &NewSS; 188 } 189 if (Correction && (NNS || NewII != &II) && 190 // Ignore a correction to a template type as the to-be-corrected 191 // identifier is not a template (typo correction for template names 192 // is handled elsewhere). 193 !(getLangOptions().CPlusPlus && NewSSPtr && 194 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(), 195 false, Template, MemberOfUnknownSpecialization))) { 196 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, 197 isClassName, HasTrailingDot, ObjectTypePtr, 198 IsCtorOrDtorName, 199 WantNontrivialTypeSourceInfo); 200 if (Ty) { 201 std::string CorrectedStr(Correction.getAsString(getLangOptions())); 202 std::string CorrectedQuotedStr( 203 Correction.getQuoted(getLangOptions())); 204 Diag(NameLoc, diag::err_unknown_typename_suggest) 205 << Result.getLookupName() << CorrectedQuotedStr 206 << FixItHint::CreateReplacement(SourceRange(NameLoc), 207 CorrectedStr); 208 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl()) 209 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 210 << CorrectedQuotedStr; 211 212 if (SS && NNS) 213 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); 214 *CorrectedII = NewII; 215 return Ty; 216 } 217 } 218 } 219 // If typo correction failed or was not performed, fall through 220 case LookupResult::FoundOverloaded: 221 case LookupResult::FoundUnresolvedValue: 222 Result.suppressDiagnostics(); 223 return ParsedType(); 224 225 case LookupResult::Ambiguous: 226 // Recover from type-hiding ambiguities by hiding the type. We'll 227 // do the lookup again when looking for an object, and we can 228 // diagnose the error then. If we don't do this, then the error 229 // about hiding the type will be immediately followed by an error 230 // that only makes sense if the identifier was treated like a type. 231 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 232 Result.suppressDiagnostics(); 233 return ParsedType(); 234 } 235 236 // Look to see if we have a type anywhere in the list of results. 237 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 238 Res != ResEnd; ++Res) { 239 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 240 if (!IIDecl || 241 (*Res)->getLocation().getRawEncoding() < 242 IIDecl->getLocation().getRawEncoding()) 243 IIDecl = *Res; 244 } 245 } 246 247 if (!IIDecl) { 248 // None of the entities we found is a type, so there is no way 249 // to even assume that the result is a type. In this case, don't 250 // complain about the ambiguity. The parser will either try to 251 // perform this lookup again (e.g., as an object name), which 252 // will produce the ambiguity, or will complain that it expected 253 // a type name. 254 Result.suppressDiagnostics(); 255 return ParsedType(); 256 } 257 258 // We found a type within the ambiguous lookup; diagnose the 259 // ambiguity and then return that type. This might be the right 260 // answer, or it might not be, but it suppresses any attempt to 261 // perform the name lookup again. 262 break; 263 264 case LookupResult::Found: 265 IIDecl = Result.getFoundDecl(); 266 break; 267 } 268 269 assert(IIDecl && "Didn't find decl"); 270 271 QualType T; 272 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 273 DiagnoseUseOfDecl(IIDecl, NameLoc); 274 275 if (T.isNull()) 276 T = Context.getTypeDeclType(TD); 277 278 // NOTE: avoid constructing an ElaboratedType(Loc) if this is a 279 // constructor or destructor name (in such a case, the scope specifier 280 // will be attached to the enclosing Expr or Decl node). 281 if (SS && SS->isNotEmpty() && !IsCtorOrDtorName) { 282 if (WantNontrivialTypeSourceInfo) { 283 // Construct a type with type-source information. 284 TypeLocBuilder Builder; 285 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 286 287 T = getElaboratedType(ETK_None, *SS, T); 288 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 289 ElabTL.setKeywordLoc(SourceLocation()); 290 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 291 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 292 } else { 293 T = getElaboratedType(ETK_None, *SS, T); 294 } 295 } 296 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 297 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 298 if (!HasTrailingDot) 299 T = Context.getObjCInterfaceType(IDecl); 300 } 301 302 if (T.isNull()) { 303 // If it's not plausibly a type, suppress diagnostics. 304 Result.suppressDiagnostics(); 305 return ParsedType(); 306 } 307 return ParsedType::make(T); 308} 309 310/// isTagName() - This method is called *for error recovery purposes only* 311/// to determine if the specified name is a valid tag name ("struct foo"). If 312/// so, this returns the TST for the tag corresponding to it (TST_enum, 313/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 314/// where the user forgot to specify the tag. 315DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 316 // Do a tag name lookup in this scope. 317 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 318 LookupName(R, S, false); 319 R.suppressDiagnostics(); 320 if (R.getResultKind() == LookupResult::Found) 321 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 322 switch (TD->getTagKind()) { 323 case TTK_Struct: return DeclSpec::TST_struct; 324 case TTK_Union: return DeclSpec::TST_union; 325 case TTK_Class: return DeclSpec::TST_class; 326 case TTK_Enum: return DeclSpec::TST_enum; 327 } 328 } 329 330 return DeclSpec::TST_unspecified; 331} 332 333/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 334/// if a CXXScopeSpec's type is equal to the type of one of the base classes 335/// then downgrade the missing typename error to a warning. 336/// This is needed for MSVC compatibility; Example: 337/// @code 338/// template<class T> class A { 339/// public: 340/// typedef int TYPE; 341/// }; 342/// template<class T> class B : public A<T> { 343/// public: 344/// A<T>::TYPE a; // no typename required because A<T> is a base class. 345/// }; 346/// @endcode 347bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 348 if (CurContext->isRecord()) { 349 const Type *Ty = SS->getScopeRep()->getAsType(); 350 351 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 352 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 353 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 354 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 355 return true; 356 return S->isFunctionPrototypeScope(); 357 } 358 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 359} 360 361bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 362 SourceLocation IILoc, 363 Scope *S, 364 CXXScopeSpec *SS, 365 ParsedType &SuggestedType) { 366 // We don't have anything to suggest (yet). 367 SuggestedType = ParsedType(); 368 369 // There may have been a typo in the name of the type. Look up typo 370 // results, in case we have something that we can suggest. 371 TypeNameValidatorCCC Validator(false); 372 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 373 LookupOrdinaryName, S, SS, 374 Validator)) { 375 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 376 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 377 378 if (Corrected.isKeyword()) { 379 // We corrected to a keyword. 380 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 381 Diag(IILoc, diag::err_unknown_typename_suggest) 382 << &II << CorrectedQuotedStr; 383 } else { 384 NamedDecl *Result = Corrected.getCorrectionDecl(); 385 // We found a similarly-named type or interface; suggest that. 386 if (!SS || !SS->isSet()) 387 Diag(IILoc, diag::err_unknown_typename_suggest) 388 << &II << CorrectedQuotedStr 389 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 390 else if (DeclContext *DC = computeDeclContext(*SS, false)) 391 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 392 << &II << DC << CorrectedQuotedStr << SS->getRange() 393 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 394 else 395 llvm_unreachable("could not have corrected a typo here"); 396 397 Diag(Result->getLocation(), diag::note_previous_decl) 398 << CorrectedQuotedStr; 399 400 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 401 false, false, ParsedType(), 402 /*IsCtorOrDtorName=*/false, 403 /*NonTrivialTypeSourceInfo=*/true); 404 } 405 return true; 406 } 407 408 if (getLangOptions().CPlusPlus) { 409 // See if II is a class template that the user forgot to pass arguments to. 410 UnqualifiedId Name; 411 Name.setIdentifier(&II, IILoc); 412 CXXScopeSpec EmptySS; 413 TemplateTy TemplateResult; 414 bool MemberOfUnknownSpecialization; 415 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 416 Name, ParsedType(), true, TemplateResult, 417 MemberOfUnknownSpecialization) == TNK_Type_template) { 418 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 419 Diag(IILoc, diag::err_template_missing_args) << TplName; 420 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 421 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 422 << TplDecl->getTemplateParameters()->getSourceRange(); 423 } 424 return true; 425 } 426 } 427 428 // FIXME: Should we move the logic that tries to recover from a missing tag 429 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 430 431 if (!SS || (!SS->isSet() && !SS->isInvalid())) 432 Diag(IILoc, diag::err_unknown_typename) << &II; 433 else if (DeclContext *DC = computeDeclContext(*SS, false)) 434 Diag(IILoc, diag::err_typename_nested_not_found) 435 << &II << DC << SS->getRange(); 436 else if (isDependentScopeSpecifier(*SS)) { 437 unsigned DiagID = diag::err_typename_missing; 438 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS, S)) 439 DiagID = diag::warn_typename_missing; 440 441 Diag(SS->getRange().getBegin(), DiagID) 442 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 443 << SourceRange(SS->getRange().getBegin(), IILoc) 444 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 445 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc) 446 .get(); 447 } else { 448 assert(SS && SS->isInvalid() && 449 "Invalid scope specifier has already been diagnosed"); 450 } 451 452 return true; 453} 454 455/// \brief Determine whether the given result set contains either a type name 456/// or 457static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 458 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 459 NextToken.is(tok::less); 460 461 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 462 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 463 return true; 464 465 if (CheckTemplate && isa<TemplateDecl>(*I)) 466 return true; 467 } 468 469 return false; 470} 471 472Sema::NameClassification Sema::ClassifyName(Scope *S, 473 CXXScopeSpec &SS, 474 IdentifierInfo *&Name, 475 SourceLocation NameLoc, 476 const Token &NextToken) { 477 DeclarationNameInfo NameInfo(Name, NameLoc); 478 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 479 480 if (NextToken.is(tok::coloncolon)) { 481 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 482 QualType(), false, SS, 0, false); 483 484 } 485 486 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 487 LookupParsedName(Result, S, &SS, !CurMethod); 488 489 // Perform lookup for Objective-C instance variables (including automatically 490 // synthesized instance variables), if we're in an Objective-C method. 491 // FIXME: This lookup really, really needs to be folded in to the normal 492 // unqualified lookup mechanism. 493 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 494 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 495 if (E.get() || E.isInvalid()) 496 return E; 497 } 498 499 bool SecondTry = false; 500 bool IsFilteredTemplateName = false; 501 502Corrected: 503 switch (Result.getResultKind()) { 504 case LookupResult::NotFound: 505 // If an unqualified-id is followed by a '(', then we have a function 506 // call. 507 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 508 // In C++, this is an ADL-only call. 509 // FIXME: Reference? 510 if (getLangOptions().CPlusPlus) 511 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 512 513 // C90 6.3.2.2: 514 // If the expression that precedes the parenthesized argument list in a 515 // function call consists solely of an identifier, and if no 516 // declaration is visible for this identifier, the identifier is 517 // implicitly declared exactly as if, in the innermost block containing 518 // the function call, the declaration 519 // 520 // extern int identifier (); 521 // 522 // appeared. 523 // 524 // We also allow this in C99 as an extension. 525 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 526 Result.addDecl(D); 527 Result.resolveKind(); 528 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 529 } 530 } 531 532 // In C, we first see whether there is a tag type by the same name, in 533 // which case it's likely that the user just forget to write "enum", 534 // "struct", or "union". 535 if (!getLangOptions().CPlusPlus && !SecondTry) { 536 Result.clear(LookupTagName); 537 LookupParsedName(Result, S, &SS); 538 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 539 const char *TagName = 0; 540 const char *FixItTagName = 0; 541 switch (Tag->getTagKind()) { 542 case TTK_Class: 543 TagName = "class"; 544 FixItTagName = "class "; 545 break; 546 547 case TTK_Enum: 548 TagName = "enum"; 549 FixItTagName = "enum "; 550 break; 551 552 case TTK_Struct: 553 TagName = "struct"; 554 FixItTagName = "struct "; 555 break; 556 557 case TTK_Union: 558 TagName = "union"; 559 FixItTagName = "union "; 560 break; 561 } 562 563 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 564 << Name << TagName << getLangOptions().CPlusPlus 565 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 566 break; 567 } 568 569 Result.clear(LookupOrdinaryName); 570 } 571 572 // Perform typo correction to determine if there is another name that is 573 // close to this name. 574 if (!SecondTry) { 575 SecondTry = true; 576 CorrectionCandidateCallback DefaultValidator; 577 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 578 Result.getLookupKind(), S, 579 &SS, DefaultValidator)) { 580 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 581 unsigned QualifiedDiag = diag::err_no_member_suggest; 582 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 583 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 584 585 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 586 NamedDecl *UnderlyingFirstDecl 587 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 588 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 589 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 590 UnqualifiedDiag = diag::err_no_template_suggest; 591 QualifiedDiag = diag::err_no_member_template_suggest; 592 } else if (UnderlyingFirstDecl && 593 (isa<TypeDecl>(UnderlyingFirstDecl) || 594 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 595 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 596 UnqualifiedDiag = diag::err_unknown_typename_suggest; 597 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 598 } 599 600 if (SS.isEmpty()) 601 Diag(NameLoc, UnqualifiedDiag) 602 << Name << CorrectedQuotedStr 603 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 604 else 605 Diag(NameLoc, QualifiedDiag) 606 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 607 << SS.getRange() 608 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 609 610 // Update the name, so that the caller has the new name. 611 Name = Corrected.getCorrectionAsIdentifierInfo(); 612 613 // Typo correction corrected to a keyword. 614 if (Corrected.isKeyword()) 615 return Corrected.getCorrectionAsIdentifierInfo(); 616 617 // Also update the LookupResult... 618 // FIXME: This should probably go away at some point 619 Result.clear(); 620 Result.setLookupName(Corrected.getCorrection()); 621 if (FirstDecl) { 622 Result.addDecl(FirstDecl); 623 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 624 << CorrectedQuotedStr; 625 } 626 627 // If we found an Objective-C instance variable, let 628 // LookupInObjCMethod build the appropriate expression to 629 // reference the ivar. 630 // FIXME: This is a gross hack. 631 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 632 Result.clear(); 633 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 634 return move(E); 635 } 636 637 goto Corrected; 638 } 639 } 640 641 // We failed to correct; just fall through and let the parser deal with it. 642 Result.suppressDiagnostics(); 643 return NameClassification::Unknown(); 644 645 case LookupResult::NotFoundInCurrentInstantiation: { 646 // We performed name lookup into the current instantiation, and there were 647 // dependent bases, so we treat this result the same way as any other 648 // dependent nested-name-specifier. 649 650 // C++ [temp.res]p2: 651 // A name used in a template declaration or definition and that is 652 // dependent on a template-parameter is assumed not to name a type 653 // unless the applicable name lookup finds a type name or the name is 654 // qualified by the keyword typename. 655 // 656 // FIXME: If the next token is '<', we might want to ask the parser to 657 // perform some heroics to see if we actually have a 658 // template-argument-list, which would indicate a missing 'template' 659 // keyword here. 660 return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(), 661 NameInfo, /*TemplateArgs=*/0); 662 } 663 664 case LookupResult::Found: 665 case LookupResult::FoundOverloaded: 666 case LookupResult::FoundUnresolvedValue: 667 break; 668 669 case LookupResult::Ambiguous: 670 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 671 hasAnyAcceptableTemplateNames(Result)) { 672 // C++ [temp.local]p3: 673 // A lookup that finds an injected-class-name (10.2) can result in an 674 // ambiguity in certain cases (for example, if it is found in more than 675 // one base class). If all of the injected-class-names that are found 676 // refer to specializations of the same class template, and if the name 677 // is followed by a template-argument-list, the reference refers to the 678 // class template itself and not a specialization thereof, and is not 679 // ambiguous. 680 // 681 // This filtering can make an ambiguous result into an unambiguous one, 682 // so try again after filtering out template names. 683 FilterAcceptableTemplateNames(Result); 684 if (!Result.isAmbiguous()) { 685 IsFilteredTemplateName = true; 686 break; 687 } 688 } 689 690 // Diagnose the ambiguity and return an error. 691 return NameClassification::Error(); 692 } 693 694 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 695 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 696 // C++ [temp.names]p3: 697 // After name lookup (3.4) finds that a name is a template-name or that 698 // an operator-function-id or a literal- operator-id refers to a set of 699 // overloaded functions any member of which is a function template if 700 // this is followed by a <, the < is always taken as the delimiter of a 701 // template-argument-list and never as the less-than operator. 702 if (!IsFilteredTemplateName) 703 FilterAcceptableTemplateNames(Result); 704 705 if (!Result.empty()) { 706 bool IsFunctionTemplate; 707 TemplateName Template; 708 if (Result.end() - Result.begin() > 1) { 709 IsFunctionTemplate = true; 710 Template = Context.getOverloadedTemplateName(Result.begin(), 711 Result.end()); 712 } else { 713 TemplateDecl *TD 714 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 715 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 716 717 if (SS.isSet() && !SS.isInvalid()) 718 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 719 /*TemplateKeyword=*/false, 720 TD); 721 else 722 Template = TemplateName(TD); 723 } 724 725 if (IsFunctionTemplate) { 726 // Function templates always go through overload resolution, at which 727 // point we'll perform the various checks (e.g., accessibility) we need 728 // to based on which function we selected. 729 Result.suppressDiagnostics(); 730 731 return NameClassification::FunctionTemplate(Template); 732 } 733 734 return NameClassification::TypeTemplate(Template); 735 } 736 } 737 738 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 739 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 740 DiagnoseUseOfDecl(Type, NameLoc); 741 QualType T = Context.getTypeDeclType(Type); 742 return ParsedType::make(T); 743 } 744 745 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 746 if (!Class) { 747 // FIXME: It's unfortunate that we don't have a Type node for handling this. 748 if (ObjCCompatibleAliasDecl *Alias 749 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 750 Class = Alias->getClassInterface(); 751 } 752 753 if (Class) { 754 DiagnoseUseOfDecl(Class, NameLoc); 755 756 if (NextToken.is(tok::period)) { 757 // Interface. <something> is parsed as a property reference expression. 758 // Just return "unknown" as a fall-through for now. 759 Result.suppressDiagnostics(); 760 return NameClassification::Unknown(); 761 } 762 763 QualType T = Context.getObjCInterfaceType(Class); 764 return ParsedType::make(T); 765 } 766 767 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 768 return BuildPossibleImplicitMemberExpr(SS, SourceLocation(), Result, 0); 769 770 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 771 return BuildDeclarationNameExpr(SS, Result, ADL); 772} 773 774// Determines the context to return to after temporarily entering a 775// context. This depends in an unnecessarily complicated way on the 776// exact ordering of callbacks from the parser. 777DeclContext *Sema::getContainingDC(DeclContext *DC) { 778 779 // Functions defined inline within classes aren't parsed until we've 780 // finished parsing the top-level class, so the top-level class is 781 // the context we'll need to return to. 782 if (isa<FunctionDecl>(DC)) { 783 DC = DC->getLexicalParent(); 784 785 // A function not defined within a class will always return to its 786 // lexical context. 787 if (!isa<CXXRecordDecl>(DC)) 788 return DC; 789 790 // A C++ inline method/friend is parsed *after* the topmost class 791 // it was declared in is fully parsed ("complete"); the topmost 792 // class is the context we need to return to. 793 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 794 DC = RD; 795 796 // Return the declaration context of the topmost class the inline method is 797 // declared in. 798 return DC; 799 } 800 801 return DC->getLexicalParent(); 802} 803 804void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 805 assert(getContainingDC(DC) == CurContext && 806 "The next DeclContext should be lexically contained in the current one."); 807 CurContext = DC; 808 S->setEntity(DC); 809} 810 811void Sema::PopDeclContext() { 812 assert(CurContext && "DeclContext imbalance!"); 813 814 CurContext = getContainingDC(CurContext); 815 assert(CurContext && "Popped translation unit!"); 816} 817 818/// EnterDeclaratorContext - Used when we must lookup names in the context 819/// of a declarator's nested name specifier. 820/// 821void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 822 // C++0x [basic.lookup.unqual]p13: 823 // A name used in the definition of a static data member of class 824 // X (after the qualified-id of the static member) is looked up as 825 // if the name was used in a member function of X. 826 // C++0x [basic.lookup.unqual]p14: 827 // If a variable member of a namespace is defined outside of the 828 // scope of its namespace then any name used in the definition of 829 // the variable member (after the declarator-id) is looked up as 830 // if the definition of the variable member occurred in its 831 // namespace. 832 // Both of these imply that we should push a scope whose context 833 // is the semantic context of the declaration. We can't use 834 // PushDeclContext here because that context is not necessarily 835 // lexically contained in the current context. Fortunately, 836 // the containing scope should have the appropriate information. 837 838 assert(!S->getEntity() && "scope already has entity"); 839 840#ifndef NDEBUG 841 Scope *Ancestor = S->getParent(); 842 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 843 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 844#endif 845 846 CurContext = DC; 847 S->setEntity(DC); 848} 849 850void Sema::ExitDeclaratorContext(Scope *S) { 851 assert(S->getEntity() == CurContext && "Context imbalance!"); 852 853 // Switch back to the lexical context. The safety of this is 854 // enforced by an assert in EnterDeclaratorContext. 855 Scope *Ancestor = S->getParent(); 856 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 857 CurContext = (DeclContext*) Ancestor->getEntity(); 858 859 // We don't need to do anything with the scope, which is going to 860 // disappear. 861} 862 863 864void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 865 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 866 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 867 // We assume that the caller has already called 868 // ActOnReenterTemplateScope 869 FD = TFD->getTemplatedDecl(); 870 } 871 if (!FD) 872 return; 873 874 PushDeclContext(S, FD); 875 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 876 ParmVarDecl *Param = FD->getParamDecl(P); 877 // If the parameter has an identifier, then add it to the scope 878 if (Param->getIdentifier()) { 879 S->AddDecl(Param); 880 IdResolver.AddDecl(Param); 881 } 882 } 883} 884 885 886/// \brief Determine whether we allow overloading of the function 887/// PrevDecl with another declaration. 888/// 889/// This routine determines whether overloading is possible, not 890/// whether some new function is actually an overload. It will return 891/// true in C++ (where we can always provide overloads) or, as an 892/// extension, in C when the previous function is already an 893/// overloaded function declaration or has the "overloadable" 894/// attribute. 895static bool AllowOverloadingOfFunction(LookupResult &Previous, 896 ASTContext &Context) { 897 if (Context.getLangOptions().CPlusPlus) 898 return true; 899 900 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 901 return true; 902 903 return (Previous.getResultKind() == LookupResult::Found 904 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 905} 906 907/// Add this decl to the scope shadowed decl chains. 908void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 909 // Move up the scope chain until we find the nearest enclosing 910 // non-transparent context. The declaration will be introduced into this 911 // scope. 912 while (S->getEntity() && 913 ((DeclContext *)S->getEntity())->isTransparentContext()) 914 S = S->getParent(); 915 916 // Add scoped declarations into their context, so that they can be 917 // found later. Declarations without a context won't be inserted 918 // into any context. 919 if (AddToContext) 920 CurContext->addDecl(D); 921 922 // Out-of-line definitions shouldn't be pushed into scope in C++. 923 // Out-of-line variable and function definitions shouldn't even in C. 924 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 925 D->isOutOfLine() && 926 !D->getDeclContext()->getRedeclContext()->Equals( 927 D->getLexicalDeclContext()->getRedeclContext())) 928 return; 929 930 // Template instantiations should also not be pushed into scope. 931 if (isa<FunctionDecl>(D) && 932 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 933 return; 934 935 // If this replaces anything in the current scope, 936 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 937 IEnd = IdResolver.end(); 938 for (; I != IEnd; ++I) { 939 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 940 S->RemoveDecl(*I); 941 IdResolver.RemoveDecl(*I); 942 943 // Should only need to replace one decl. 944 break; 945 } 946 } 947 948 S->AddDecl(D); 949 950 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 951 // Implicitly-generated labels may end up getting generated in an order that 952 // isn't strictly lexical, which breaks name lookup. Be careful to insert 953 // the label at the appropriate place in the identifier chain. 954 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 955 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 956 if (IDC == CurContext) { 957 if (!S->isDeclScope(*I)) 958 continue; 959 } else if (IDC->Encloses(CurContext)) 960 break; 961 } 962 963 IdResolver.InsertDeclAfter(I, D); 964 } else { 965 IdResolver.AddDecl(D); 966 } 967} 968 969void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) { 970 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope) 971 TUScope->AddDecl(D); 972} 973 974bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 975 bool ExplicitInstantiationOrSpecialization) { 976 return IdResolver.isDeclInScope(D, Ctx, Context, S, 977 ExplicitInstantiationOrSpecialization); 978} 979 980Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 981 DeclContext *TargetDC = DC->getPrimaryContext(); 982 do { 983 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 984 if (ScopeDC->getPrimaryContext() == TargetDC) 985 return S; 986 } while ((S = S->getParent())); 987 988 return 0; 989} 990 991static bool isOutOfScopePreviousDeclaration(NamedDecl *, 992 DeclContext*, 993 ASTContext&); 994 995/// Filters out lookup results that don't fall within the given scope 996/// as determined by isDeclInScope. 997void Sema::FilterLookupForScope(LookupResult &R, 998 DeclContext *Ctx, Scope *S, 999 bool ConsiderLinkage, 1000 bool ExplicitInstantiationOrSpecialization) { 1001 LookupResult::Filter F = R.makeFilter(); 1002 while (F.hasNext()) { 1003 NamedDecl *D = F.next(); 1004 1005 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 1006 continue; 1007 1008 if (ConsiderLinkage && 1009 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 1010 continue; 1011 1012 F.erase(); 1013 } 1014 1015 F.done(); 1016} 1017 1018static bool isUsingDecl(NamedDecl *D) { 1019 return isa<UsingShadowDecl>(D) || 1020 isa<UnresolvedUsingTypenameDecl>(D) || 1021 isa<UnresolvedUsingValueDecl>(D); 1022} 1023 1024/// Removes using shadow declarations from the lookup results. 1025static void RemoveUsingDecls(LookupResult &R) { 1026 LookupResult::Filter F = R.makeFilter(); 1027 while (F.hasNext()) 1028 if (isUsingDecl(F.next())) 1029 F.erase(); 1030 1031 F.done(); 1032} 1033 1034/// \brief Check for this common pattern: 1035/// @code 1036/// class S { 1037/// S(const S&); // DO NOT IMPLEMENT 1038/// void operator=(const S&); // DO NOT IMPLEMENT 1039/// }; 1040/// @endcode 1041static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1042 // FIXME: Should check for private access too but access is set after we get 1043 // the decl here. 1044 if (D->doesThisDeclarationHaveABody()) 1045 return false; 1046 1047 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1048 return CD->isCopyConstructor(); 1049 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1050 return Method->isCopyAssignmentOperator(); 1051 return false; 1052} 1053 1054bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1055 assert(D); 1056 1057 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1058 return false; 1059 1060 // Ignore class templates. 1061 if (D->getDeclContext()->isDependentContext() || 1062 D->getLexicalDeclContext()->isDependentContext()) 1063 return false; 1064 1065 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1066 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1067 return false; 1068 1069 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1070 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1071 return false; 1072 } else { 1073 // 'static inline' functions are used in headers; don't warn. 1074 if (FD->getStorageClass() == SC_Static && 1075 FD->isInlineSpecified()) 1076 return false; 1077 } 1078 1079 if (FD->doesThisDeclarationHaveABody() && 1080 Context.DeclMustBeEmitted(FD)) 1081 return false; 1082 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1083 if (!VD->isFileVarDecl() || 1084 VD->getType().isConstant(Context) || 1085 Context.DeclMustBeEmitted(VD)) 1086 return false; 1087 1088 if (VD->isStaticDataMember() && 1089 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1090 return false; 1091 1092 } else { 1093 return false; 1094 } 1095 1096 // Only warn for unused decls internal to the translation unit. 1097 if (D->getLinkage() == ExternalLinkage) 1098 return false; 1099 1100 return true; 1101} 1102 1103void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1104 if (!D) 1105 return; 1106 1107 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1108 const FunctionDecl *First = FD->getFirstDeclaration(); 1109 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1110 return; // First should already be in the vector. 1111 } 1112 1113 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1114 const VarDecl *First = VD->getFirstDeclaration(); 1115 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1116 return; // First should already be in the vector. 1117 } 1118 1119 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1120 UnusedFileScopedDecls.push_back(D); 1121 } 1122 1123static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1124 if (D->isInvalidDecl()) 1125 return false; 1126 1127 if (D->isReferenced() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1128 return false; 1129 1130 if (isa<LabelDecl>(D)) 1131 return true; 1132 1133 // White-list anything that isn't a local variable. 1134 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1135 !D->getDeclContext()->isFunctionOrMethod()) 1136 return false; 1137 1138 // Types of valid local variables should be complete, so this should succeed. 1139 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1140 1141 // White-list anything with an __attribute__((unused)) type. 1142 QualType Ty = VD->getType(); 1143 1144 // Only look at the outermost level of typedef. 1145 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1146 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1147 return false; 1148 } 1149 1150 // If we failed to complete the type for some reason, or if the type is 1151 // dependent, don't diagnose the variable. 1152 if (Ty->isIncompleteType() || Ty->isDependentType()) 1153 return false; 1154 1155 if (const TagType *TT = Ty->getAs<TagType>()) { 1156 const TagDecl *Tag = TT->getDecl(); 1157 if (Tag->hasAttr<UnusedAttr>()) 1158 return false; 1159 1160 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1161 if (!RD->hasTrivialDestructor()) 1162 return false; 1163 1164 if (const Expr *Init = VD->getInit()) { 1165 const CXXConstructExpr *Construct = 1166 dyn_cast<CXXConstructExpr>(Init); 1167 if (Construct && !Construct->isElidable()) { 1168 CXXConstructorDecl *CD = Construct->getConstructor(); 1169 if (!CD->isTrivial()) 1170 return false; 1171 } 1172 } 1173 } 1174 } 1175 1176 // TODO: __attribute__((unused)) templates? 1177 } 1178 1179 return true; 1180} 1181 1182static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1183 FixItHint &Hint) { 1184 if (isa<LabelDecl>(D)) { 1185 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1186 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1187 if (AfterColon.isInvalid()) 1188 return; 1189 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1190 getCharRange(D->getLocStart(), AfterColon)); 1191 } 1192 return; 1193} 1194 1195/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1196/// unless they are marked attr(unused). 1197void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1198 FixItHint Hint; 1199 if (!ShouldDiagnoseUnusedDecl(D)) 1200 return; 1201 1202 GenerateFixForUnusedDecl(D, Context, Hint); 1203 1204 unsigned DiagID; 1205 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1206 DiagID = diag::warn_unused_exception_param; 1207 else if (isa<LabelDecl>(D)) 1208 DiagID = diag::warn_unused_label; 1209 else 1210 DiagID = diag::warn_unused_variable; 1211 1212 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1213} 1214 1215static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1216 // Verify that we have no forward references left. If so, there was a goto 1217 // or address of a label taken, but no definition of it. Label fwd 1218 // definitions are indicated with a null substmt. 1219 if (L->getStmt() == 0) 1220 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1221} 1222 1223void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1224 if (S->decl_empty()) return; 1225 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1226 "Scope shouldn't contain decls!"); 1227 1228 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1229 I != E; ++I) { 1230 Decl *TmpD = (*I); 1231 assert(TmpD && "This decl didn't get pushed??"); 1232 1233 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1234 NamedDecl *D = cast<NamedDecl>(TmpD); 1235 1236 if (!D->getDeclName()) continue; 1237 1238 // Diagnose unused variables in this scope. 1239 if (!S->hasErrorOccurred()) 1240 DiagnoseUnusedDecl(D); 1241 1242 // If this was a forward reference to a label, verify it was defined. 1243 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1244 CheckPoppedLabel(LD, *this); 1245 1246 // Remove this name from our lexical scope. 1247 IdResolver.RemoveDecl(D); 1248 } 1249} 1250 1251/// \brief Look for an Objective-C class in the translation unit. 1252/// 1253/// \param Id The name of the Objective-C class we're looking for. If 1254/// typo-correction fixes this name, the Id will be updated 1255/// to the fixed name. 1256/// 1257/// \param IdLoc The location of the name in the translation unit. 1258/// 1259/// \param TypoCorrection If true, this routine will attempt typo correction 1260/// if there is no class with the given name. 1261/// 1262/// \returns The declaration of the named Objective-C class, or NULL if the 1263/// class could not be found. 1264ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1265 SourceLocation IdLoc, 1266 bool DoTypoCorrection) { 1267 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1268 // creation from this context. 1269 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1270 1271 if (!IDecl && DoTypoCorrection) { 1272 // Perform typo correction at the given location, but only if we 1273 // find an Objective-C class name. 1274 DeclFilterCCC<ObjCInterfaceDecl> Validator; 1275 if (TypoCorrection C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), 1276 LookupOrdinaryName, TUScope, NULL, 1277 Validator)) { 1278 IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>(); 1279 Diag(IdLoc, diag::err_undef_interface_suggest) 1280 << Id << IDecl->getDeclName() 1281 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1282 Diag(IDecl->getLocation(), diag::note_previous_decl) 1283 << IDecl->getDeclName(); 1284 1285 Id = IDecl->getIdentifier(); 1286 } 1287 } 1288 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1289 // This routine must always return a class definition, if any. 1290 if (Def && Def->getDefinition()) 1291 Def = Def->getDefinition(); 1292 return Def; 1293} 1294 1295/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1296/// from S, where a non-field would be declared. This routine copes 1297/// with the difference between C and C++ scoping rules in structs and 1298/// unions. For example, the following code is well-formed in C but 1299/// ill-formed in C++: 1300/// @code 1301/// struct S6 { 1302/// enum { BAR } e; 1303/// }; 1304/// 1305/// void test_S6() { 1306/// struct S6 a; 1307/// a.e = BAR; 1308/// } 1309/// @endcode 1310/// For the declaration of BAR, this routine will return a different 1311/// scope. The scope S will be the scope of the unnamed enumeration 1312/// within S6. In C++, this routine will return the scope associated 1313/// with S6, because the enumeration's scope is a transparent 1314/// context but structures can contain non-field names. In C, this 1315/// routine will return the translation unit scope, since the 1316/// enumeration's scope is a transparent context and structures cannot 1317/// contain non-field names. 1318Scope *Sema::getNonFieldDeclScope(Scope *S) { 1319 while (((S->getFlags() & Scope::DeclScope) == 0) || 1320 (S->getEntity() && 1321 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1322 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1323 S = S->getParent(); 1324 return S; 1325} 1326 1327/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1328/// file scope. lazily create a decl for it. ForRedeclaration is true 1329/// if we're creating this built-in in anticipation of redeclaring the 1330/// built-in. 1331NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1332 Scope *S, bool ForRedeclaration, 1333 SourceLocation Loc) { 1334 Builtin::ID BID = (Builtin::ID)bid; 1335 1336 ASTContext::GetBuiltinTypeError Error; 1337 QualType R = Context.GetBuiltinType(BID, Error); 1338 switch (Error) { 1339 case ASTContext::GE_None: 1340 // Okay 1341 break; 1342 1343 case ASTContext::GE_Missing_stdio: 1344 if (ForRedeclaration) 1345 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1346 << Context.BuiltinInfo.GetName(BID); 1347 return 0; 1348 1349 case ASTContext::GE_Missing_setjmp: 1350 if (ForRedeclaration) 1351 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1352 << Context.BuiltinInfo.GetName(BID); 1353 return 0; 1354 1355 case ASTContext::GE_Missing_ucontext: 1356 if (ForRedeclaration) 1357 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1358 << Context.BuiltinInfo.GetName(BID); 1359 return 0; 1360 } 1361 1362 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1363 Diag(Loc, diag::ext_implicit_lib_function_decl) 1364 << Context.BuiltinInfo.GetName(BID) 1365 << R; 1366 if (Context.BuiltinInfo.getHeaderName(BID) && 1367 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1368 != DiagnosticsEngine::Ignored) 1369 Diag(Loc, diag::note_please_include_header) 1370 << Context.BuiltinInfo.getHeaderName(BID) 1371 << Context.BuiltinInfo.GetName(BID); 1372 } 1373 1374 FunctionDecl *New = FunctionDecl::Create(Context, 1375 Context.getTranslationUnitDecl(), 1376 Loc, Loc, II, R, /*TInfo=*/0, 1377 SC_Extern, 1378 SC_None, false, 1379 /*hasPrototype=*/true); 1380 New->setImplicit(); 1381 1382 // Create Decl objects for each parameter, adding them to the 1383 // FunctionDecl. 1384 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1385 SmallVector<ParmVarDecl*, 16> Params; 1386 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1387 ParmVarDecl *parm = 1388 ParmVarDecl::Create(Context, New, SourceLocation(), 1389 SourceLocation(), 0, 1390 FT->getArgType(i), /*TInfo=*/0, 1391 SC_None, SC_None, 0); 1392 parm->setScopeInfo(0, i); 1393 Params.push_back(parm); 1394 } 1395 New->setParams(Params); 1396 } 1397 1398 AddKnownFunctionAttributes(New); 1399 1400 // TUScope is the translation-unit scope to insert this function into. 1401 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1402 // relate Scopes to DeclContexts, and probably eliminate CurContext 1403 // entirely, but we're not there yet. 1404 DeclContext *SavedContext = CurContext; 1405 CurContext = Context.getTranslationUnitDecl(); 1406 PushOnScopeChains(New, TUScope); 1407 CurContext = SavedContext; 1408 return New; 1409} 1410 1411bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { 1412 QualType OldType; 1413 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1414 OldType = OldTypedef->getUnderlyingType(); 1415 else 1416 OldType = Context.getTypeDeclType(Old); 1417 QualType NewType = New->getUnderlyingType(); 1418 1419 if (NewType->isVariablyModifiedType()) { 1420 // Must not redefine a typedef with a variably-modified type. 1421 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1422 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef) 1423 << Kind << NewType; 1424 if (Old->getLocation().isValid()) 1425 Diag(Old->getLocation(), diag::note_previous_definition); 1426 New->setInvalidDecl(); 1427 return true; 1428 } 1429 1430 if (OldType != NewType && 1431 !OldType->isDependentType() && 1432 !NewType->isDependentType() && 1433 !Context.hasSameType(OldType, NewType)) { 1434 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1435 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1436 << Kind << NewType << OldType; 1437 if (Old->getLocation().isValid()) 1438 Diag(Old->getLocation(), diag::note_previous_definition); 1439 New->setInvalidDecl(); 1440 return true; 1441 } 1442 return false; 1443} 1444 1445/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1446/// same name and scope as a previous declaration 'Old'. Figure out 1447/// how to resolve this situation, merging decls or emitting 1448/// diagnostics as appropriate. If there was an error, set New to be invalid. 1449/// 1450void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1451 // If the new decl is known invalid already, don't bother doing any 1452 // merging checks. 1453 if (New->isInvalidDecl()) return; 1454 1455 // Allow multiple definitions for ObjC built-in typedefs. 1456 // FIXME: Verify the underlying types are equivalent! 1457 if (getLangOptions().ObjC1) { 1458 const IdentifierInfo *TypeID = New->getIdentifier(); 1459 switch (TypeID->getLength()) { 1460 default: break; 1461 case 2: 1462 if (!TypeID->isStr("id")) 1463 break; 1464 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1465 // Install the built-in type for 'id', ignoring the current definition. 1466 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1467 return; 1468 case 5: 1469 if (!TypeID->isStr("Class")) 1470 break; 1471 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1472 // Install the built-in type for 'Class', ignoring the current definition. 1473 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1474 return; 1475 case 3: 1476 if (!TypeID->isStr("SEL")) 1477 break; 1478 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1479 // Install the built-in type for 'SEL', ignoring the current definition. 1480 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1481 return; 1482 } 1483 // Fall through - the typedef name was not a builtin type. 1484 } 1485 1486 // Verify the old decl was also a type. 1487 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1488 if (!Old) { 1489 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1490 << New->getDeclName(); 1491 1492 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1493 if (OldD->getLocation().isValid()) 1494 Diag(OldD->getLocation(), diag::note_previous_definition); 1495 1496 return New->setInvalidDecl(); 1497 } 1498 1499 // If the old declaration is invalid, just give up here. 1500 if (Old->isInvalidDecl()) 1501 return New->setInvalidDecl(); 1502 1503 // If the typedef types are not identical, reject them in all languages and 1504 // with any extensions enabled. 1505 if (isIncompatibleTypedef(Old, New)) 1506 return; 1507 1508 // The types match. Link up the redeclaration chain if the old 1509 // declaration was a typedef. 1510 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1511 New->setPreviousDeclaration(Typedef); 1512 1513 if (getLangOptions().MicrosoftExt) 1514 return; 1515 1516 if (getLangOptions().CPlusPlus) { 1517 // C++ [dcl.typedef]p2: 1518 // In a given non-class scope, a typedef specifier can be used to 1519 // redefine the name of any type declared in that scope to refer 1520 // to the type to which it already refers. 1521 if (!isa<CXXRecordDecl>(CurContext)) 1522 return; 1523 1524 // C++0x [dcl.typedef]p4: 1525 // In a given class scope, a typedef specifier can be used to redefine 1526 // any class-name declared in that scope that is not also a typedef-name 1527 // to refer to the type to which it already refers. 1528 // 1529 // This wording came in via DR424, which was a correction to the 1530 // wording in DR56, which accidentally banned code like: 1531 // 1532 // struct S { 1533 // typedef struct A { } A; 1534 // }; 1535 // 1536 // in the C++03 standard. We implement the C++0x semantics, which 1537 // allow the above but disallow 1538 // 1539 // struct S { 1540 // typedef int I; 1541 // typedef int I; 1542 // }; 1543 // 1544 // since that was the intent of DR56. 1545 if (!isa<TypedefNameDecl>(Old)) 1546 return; 1547 1548 Diag(New->getLocation(), diag::err_redefinition) 1549 << New->getDeclName(); 1550 Diag(Old->getLocation(), diag::note_previous_definition); 1551 return New->setInvalidDecl(); 1552 } 1553 1554 // Modules always permit redefinition of typedefs, as does C11. 1555 if (getLangOptions().Modules || getLangOptions().C11) 1556 return; 1557 1558 // If we have a redefinition of a typedef in C, emit a warning. This warning 1559 // is normally mapped to an error, but can be controlled with 1560 // -Wtypedef-redefinition. If either the original or the redefinition is 1561 // in a system header, don't emit this for compatibility with GCC. 1562 if (getDiagnostics().getSuppressSystemWarnings() && 1563 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1564 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1565 return; 1566 1567 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1568 << New->getDeclName(); 1569 Diag(Old->getLocation(), diag::note_previous_definition); 1570 return; 1571} 1572 1573/// DeclhasAttr - returns true if decl Declaration already has the target 1574/// attribute. 1575static bool 1576DeclHasAttr(const Decl *D, const Attr *A) { 1577 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1578 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1579 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1580 if ((*i)->getKind() == A->getKind()) { 1581 if (Ann) { 1582 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1583 return true; 1584 continue; 1585 } 1586 // FIXME: Don't hardcode this check 1587 if (OA && isa<OwnershipAttr>(*i)) 1588 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1589 return true; 1590 } 1591 1592 return false; 1593} 1594 1595/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1596void Sema::mergeDeclAttributes(Decl *New, Decl *Old, 1597 bool MergeDeprecation) { 1598 if (!Old->hasAttrs()) 1599 return; 1600 1601 bool foundAny = New->hasAttrs(); 1602 1603 // Ensure that any moving of objects within the allocated map is done before 1604 // we process them. 1605 if (!foundAny) New->setAttrs(AttrVec()); 1606 1607 for (specific_attr_iterator<InheritableAttr> 1608 i = Old->specific_attr_begin<InheritableAttr>(), 1609 e = Old->specific_attr_end<InheritableAttr>(); 1610 i != e; ++i) { 1611 // Ignore deprecated/unavailable/availability attributes if requested. 1612 if (!MergeDeprecation && 1613 (isa<DeprecatedAttr>(*i) || 1614 isa<UnavailableAttr>(*i) || 1615 isa<AvailabilityAttr>(*i))) 1616 continue; 1617 1618 if (!DeclHasAttr(New, *i)) { 1619 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(Context)); 1620 newAttr->setInherited(true); 1621 New->addAttr(newAttr); 1622 foundAny = true; 1623 } 1624 } 1625 1626 if (!foundAny) New->dropAttrs(); 1627} 1628 1629/// mergeParamDeclAttributes - Copy attributes from the old parameter 1630/// to the new one. 1631static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1632 const ParmVarDecl *oldDecl, 1633 ASTContext &C) { 1634 if (!oldDecl->hasAttrs()) 1635 return; 1636 1637 bool foundAny = newDecl->hasAttrs(); 1638 1639 // Ensure that any moving of objects within the allocated map is 1640 // done before we process them. 1641 if (!foundAny) newDecl->setAttrs(AttrVec()); 1642 1643 for (specific_attr_iterator<InheritableParamAttr> 1644 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1645 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1646 if (!DeclHasAttr(newDecl, *i)) { 1647 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1648 newAttr->setInherited(true); 1649 newDecl->addAttr(newAttr); 1650 foundAny = true; 1651 } 1652 } 1653 1654 if (!foundAny) newDecl->dropAttrs(); 1655} 1656 1657namespace { 1658 1659/// Used in MergeFunctionDecl to keep track of function parameters in 1660/// C. 1661struct GNUCompatibleParamWarning { 1662 ParmVarDecl *OldParm; 1663 ParmVarDecl *NewParm; 1664 QualType PromotedType; 1665}; 1666 1667} 1668 1669/// getSpecialMember - get the special member enum for a method. 1670Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1671 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1672 if (Ctor->isDefaultConstructor()) 1673 return Sema::CXXDefaultConstructor; 1674 1675 if (Ctor->isCopyConstructor()) 1676 return Sema::CXXCopyConstructor; 1677 1678 if (Ctor->isMoveConstructor()) 1679 return Sema::CXXMoveConstructor; 1680 } else if (isa<CXXDestructorDecl>(MD)) { 1681 return Sema::CXXDestructor; 1682 } else if (MD->isCopyAssignmentOperator()) { 1683 return Sema::CXXCopyAssignment; 1684 } else if (MD->isMoveAssignmentOperator()) { 1685 return Sema::CXXMoveAssignment; 1686 } 1687 1688 return Sema::CXXInvalid; 1689} 1690 1691/// canRedefineFunction - checks if a function can be redefined. Currently, 1692/// only extern inline functions can be redefined, and even then only in 1693/// GNU89 mode. 1694static bool canRedefineFunction(const FunctionDecl *FD, 1695 const LangOptions& LangOpts) { 1696 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1697 !LangOpts.CPlusPlus && 1698 FD->isInlineSpecified() && 1699 FD->getStorageClass() == SC_Extern); 1700} 1701 1702/// MergeFunctionDecl - We just parsed a function 'New' from 1703/// declarator D which has the same name and scope as a previous 1704/// declaration 'Old'. Figure out how to resolve this situation, 1705/// merging decls or emitting diagnostics as appropriate. 1706/// 1707/// In C++, New and Old must be declarations that are not 1708/// overloaded. Use IsOverload to determine whether New and Old are 1709/// overloaded, and to select the Old declaration that New should be 1710/// merged with. 1711/// 1712/// Returns true if there was an error, false otherwise. 1713bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1714 // Verify the old decl was also a function. 1715 FunctionDecl *Old = 0; 1716 if (FunctionTemplateDecl *OldFunctionTemplate 1717 = dyn_cast<FunctionTemplateDecl>(OldD)) 1718 Old = OldFunctionTemplate->getTemplatedDecl(); 1719 else 1720 Old = dyn_cast<FunctionDecl>(OldD); 1721 if (!Old) { 1722 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1723 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1724 Diag(Shadow->getTargetDecl()->getLocation(), 1725 diag::note_using_decl_target); 1726 Diag(Shadow->getUsingDecl()->getLocation(), 1727 diag::note_using_decl) << 0; 1728 return true; 1729 } 1730 1731 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1732 << New->getDeclName(); 1733 Diag(OldD->getLocation(), diag::note_previous_definition); 1734 return true; 1735 } 1736 1737 // Determine whether the previous declaration was a definition, 1738 // implicit declaration, or a declaration. 1739 diag::kind PrevDiag; 1740 if (Old->isThisDeclarationADefinition()) 1741 PrevDiag = diag::note_previous_definition; 1742 else if (Old->isImplicit()) 1743 PrevDiag = diag::note_previous_implicit_declaration; 1744 else 1745 PrevDiag = diag::note_previous_declaration; 1746 1747 QualType OldQType = Context.getCanonicalType(Old->getType()); 1748 QualType NewQType = Context.getCanonicalType(New->getType()); 1749 1750 // Don't complain about this if we're in GNU89 mode and the old function 1751 // is an extern inline function. 1752 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1753 New->getStorageClass() == SC_Static && 1754 Old->getStorageClass() != SC_Static && 1755 !canRedefineFunction(Old, getLangOptions())) { 1756 if (getLangOptions().MicrosoftExt) { 1757 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1758 Diag(Old->getLocation(), PrevDiag); 1759 } else { 1760 Diag(New->getLocation(), diag::err_static_non_static) << New; 1761 Diag(Old->getLocation(), PrevDiag); 1762 return true; 1763 } 1764 } 1765 1766 // If a function is first declared with a calling convention, but is 1767 // later declared or defined without one, the second decl assumes the 1768 // calling convention of the first. 1769 // 1770 // For the new decl, we have to look at the NON-canonical type to tell the 1771 // difference between a function that really doesn't have a calling 1772 // convention and one that is declared cdecl. That's because in 1773 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1774 // because it is the default calling convention. 1775 // 1776 // Note also that we DO NOT return at this point, because we still have 1777 // other tests to run. 1778 const FunctionType *OldType = cast<FunctionType>(OldQType); 1779 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1780 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1781 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1782 bool RequiresAdjustment = false; 1783 if (OldTypeInfo.getCC() != CC_Default && 1784 NewTypeInfo.getCC() == CC_Default) { 1785 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1786 RequiresAdjustment = true; 1787 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1788 NewTypeInfo.getCC())) { 1789 // Calling conventions really aren't compatible, so complain. 1790 Diag(New->getLocation(), diag::err_cconv_change) 1791 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1792 << (OldTypeInfo.getCC() == CC_Default) 1793 << (OldTypeInfo.getCC() == CC_Default ? "" : 1794 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1795 Diag(Old->getLocation(), diag::note_previous_declaration); 1796 return true; 1797 } 1798 1799 // FIXME: diagnose the other way around? 1800 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1801 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1802 RequiresAdjustment = true; 1803 } 1804 1805 // Merge regparm attribute. 1806 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1807 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1808 if (NewTypeInfo.getHasRegParm()) { 1809 Diag(New->getLocation(), diag::err_regparm_mismatch) 1810 << NewType->getRegParmType() 1811 << OldType->getRegParmType(); 1812 Diag(Old->getLocation(), diag::note_previous_declaration); 1813 return true; 1814 } 1815 1816 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1817 RequiresAdjustment = true; 1818 } 1819 1820 // Merge ns_returns_retained attribute. 1821 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1822 if (NewTypeInfo.getProducesResult()) { 1823 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1824 Diag(Old->getLocation(), diag::note_previous_declaration); 1825 return true; 1826 } 1827 1828 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1829 RequiresAdjustment = true; 1830 } 1831 1832 if (RequiresAdjustment) { 1833 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1834 New->setType(QualType(NewType, 0)); 1835 NewQType = Context.getCanonicalType(New->getType()); 1836 } 1837 1838 if (getLangOptions().CPlusPlus) { 1839 // (C++98 13.1p2): 1840 // Certain function declarations cannot be overloaded: 1841 // -- Function declarations that differ only in the return type 1842 // cannot be overloaded. 1843 QualType OldReturnType = OldType->getResultType(); 1844 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1845 QualType ResQT; 1846 if (OldReturnType != NewReturnType) { 1847 if (NewReturnType->isObjCObjectPointerType() 1848 && OldReturnType->isObjCObjectPointerType()) 1849 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1850 if (ResQT.isNull()) { 1851 if (New->isCXXClassMember() && New->isOutOfLine()) 1852 Diag(New->getLocation(), 1853 diag::err_member_def_does_not_match_ret_type) << New; 1854 else 1855 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1856 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1857 return true; 1858 } 1859 else 1860 NewQType = ResQT; 1861 } 1862 1863 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1864 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1865 if (OldMethod && NewMethod) { 1866 // Preserve triviality. 1867 NewMethod->setTrivial(OldMethod->isTrivial()); 1868 1869 // MSVC allows explicit template specialization at class scope: 1870 // 2 CXMethodDecls referring to the same function will be injected. 1871 // We don't want a redeclartion error. 1872 bool IsClassScopeExplicitSpecialization = 1873 OldMethod->isFunctionTemplateSpecialization() && 1874 NewMethod->isFunctionTemplateSpecialization(); 1875 bool isFriend = NewMethod->getFriendObjectKind(); 1876 1877 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1878 !IsClassScopeExplicitSpecialization) { 1879 // -- Member function declarations with the same name and the 1880 // same parameter types cannot be overloaded if any of them 1881 // is a static member function declaration. 1882 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1883 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1884 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1885 return true; 1886 } 1887 1888 // C++ [class.mem]p1: 1889 // [...] A member shall not be declared twice in the 1890 // member-specification, except that a nested class or member 1891 // class template can be declared and then later defined. 1892 unsigned NewDiag; 1893 if (isa<CXXConstructorDecl>(OldMethod)) 1894 NewDiag = diag::err_constructor_redeclared; 1895 else if (isa<CXXDestructorDecl>(NewMethod)) 1896 NewDiag = diag::err_destructor_redeclared; 1897 else if (isa<CXXConversionDecl>(NewMethod)) 1898 NewDiag = diag::err_conv_function_redeclared; 1899 else 1900 NewDiag = diag::err_member_redeclared; 1901 1902 Diag(New->getLocation(), NewDiag); 1903 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1904 1905 // Complain if this is an explicit declaration of a special 1906 // member that was initially declared implicitly. 1907 // 1908 // As an exception, it's okay to befriend such methods in order 1909 // to permit the implicit constructor/destructor/operator calls. 1910 } else if (OldMethod->isImplicit()) { 1911 if (isFriend) { 1912 NewMethod->setImplicit(); 1913 } else { 1914 Diag(NewMethod->getLocation(), 1915 diag::err_definition_of_implicitly_declared_member) 1916 << New << getSpecialMember(OldMethod); 1917 return true; 1918 } 1919 } else if (OldMethod->isExplicitlyDefaulted()) { 1920 Diag(NewMethod->getLocation(), 1921 diag::err_definition_of_explicitly_defaulted_member) 1922 << getSpecialMember(OldMethod); 1923 return true; 1924 } 1925 } 1926 1927 // (C++98 8.3.5p3): 1928 // All declarations for a function shall agree exactly in both the 1929 // return type and the parameter-type-list. 1930 // We also want to respect all the extended bits except noreturn. 1931 1932 // noreturn should now match unless the old type info didn't have it. 1933 QualType OldQTypeForComparison = OldQType; 1934 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1935 assert(OldQType == QualType(OldType, 0)); 1936 const FunctionType *OldTypeForComparison 1937 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1938 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1939 assert(OldQTypeForComparison.isCanonical()); 1940 } 1941 1942 if (OldQTypeForComparison == NewQType) 1943 return MergeCompatibleFunctionDecls(New, Old); 1944 1945 // Fall through for conflicting redeclarations and redefinitions. 1946 } 1947 1948 // C: Function types need to be compatible, not identical. This handles 1949 // duplicate function decls like "void f(int); void f(enum X);" properly. 1950 if (!getLangOptions().CPlusPlus && 1951 Context.typesAreCompatible(OldQType, NewQType)) { 1952 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1953 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1954 const FunctionProtoType *OldProto = 0; 1955 if (isa<FunctionNoProtoType>(NewFuncType) && 1956 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1957 // The old declaration provided a function prototype, but the 1958 // new declaration does not. Merge in the prototype. 1959 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1960 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1961 OldProto->arg_type_end()); 1962 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1963 ParamTypes.data(), ParamTypes.size(), 1964 OldProto->getExtProtoInfo()); 1965 New->setType(NewQType); 1966 New->setHasInheritedPrototype(); 1967 1968 // Synthesize a parameter for each argument type. 1969 SmallVector<ParmVarDecl*, 16> Params; 1970 for (FunctionProtoType::arg_type_iterator 1971 ParamType = OldProto->arg_type_begin(), 1972 ParamEnd = OldProto->arg_type_end(); 1973 ParamType != ParamEnd; ++ParamType) { 1974 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1975 SourceLocation(), 1976 SourceLocation(), 0, 1977 *ParamType, /*TInfo=*/0, 1978 SC_None, SC_None, 1979 0); 1980 Param->setScopeInfo(0, Params.size()); 1981 Param->setImplicit(); 1982 Params.push_back(Param); 1983 } 1984 1985 New->setParams(Params); 1986 } 1987 1988 return MergeCompatibleFunctionDecls(New, Old); 1989 } 1990 1991 // GNU C permits a K&R definition to follow a prototype declaration 1992 // if the declared types of the parameters in the K&R definition 1993 // match the types in the prototype declaration, even when the 1994 // promoted types of the parameters from the K&R definition differ 1995 // from the types in the prototype. GCC then keeps the types from 1996 // the prototype. 1997 // 1998 // If a variadic prototype is followed by a non-variadic K&R definition, 1999 // the K&R definition becomes variadic. This is sort of an edge case, but 2000 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 2001 // C99 6.9.1p8. 2002 if (!getLangOptions().CPlusPlus && 2003 Old->hasPrototype() && !New->hasPrototype() && 2004 New->getType()->getAs<FunctionProtoType>() && 2005 Old->getNumParams() == New->getNumParams()) { 2006 SmallVector<QualType, 16> ArgTypes; 2007 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 2008 const FunctionProtoType *OldProto 2009 = Old->getType()->getAs<FunctionProtoType>(); 2010 const FunctionProtoType *NewProto 2011 = New->getType()->getAs<FunctionProtoType>(); 2012 2013 // Determine whether this is the GNU C extension. 2014 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 2015 NewProto->getResultType()); 2016 bool LooseCompatible = !MergedReturn.isNull(); 2017 for (unsigned Idx = 0, End = Old->getNumParams(); 2018 LooseCompatible && Idx != End; ++Idx) { 2019 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 2020 ParmVarDecl *NewParm = New->getParamDecl(Idx); 2021 if (Context.typesAreCompatible(OldParm->getType(), 2022 NewProto->getArgType(Idx))) { 2023 ArgTypes.push_back(NewParm->getType()); 2024 } else if (Context.typesAreCompatible(OldParm->getType(), 2025 NewParm->getType(), 2026 /*CompareUnqualified=*/true)) { 2027 GNUCompatibleParamWarning Warn 2028 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 2029 Warnings.push_back(Warn); 2030 ArgTypes.push_back(NewParm->getType()); 2031 } else 2032 LooseCompatible = false; 2033 } 2034 2035 if (LooseCompatible) { 2036 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 2037 Diag(Warnings[Warn].NewParm->getLocation(), 2038 diag::ext_param_promoted_not_compatible_with_prototype) 2039 << Warnings[Warn].PromotedType 2040 << Warnings[Warn].OldParm->getType(); 2041 if (Warnings[Warn].OldParm->getLocation().isValid()) 2042 Diag(Warnings[Warn].OldParm->getLocation(), 2043 diag::note_previous_declaration); 2044 } 2045 2046 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 2047 ArgTypes.size(), 2048 OldProto->getExtProtoInfo())); 2049 return MergeCompatibleFunctionDecls(New, Old); 2050 } 2051 2052 // Fall through to diagnose conflicting types. 2053 } 2054 2055 // A function that has already been declared has been redeclared or defined 2056 // with a different type- show appropriate diagnostic 2057 if (unsigned BuiltinID = Old->getBuiltinID()) { 2058 // The user has declared a builtin function with an incompatible 2059 // signature. 2060 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2061 // The function the user is redeclaring is a library-defined 2062 // function like 'malloc' or 'printf'. Warn about the 2063 // redeclaration, then pretend that we don't know about this 2064 // library built-in. 2065 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2066 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2067 << Old << Old->getType(); 2068 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2069 Old->setInvalidDecl(); 2070 return false; 2071 } 2072 2073 PrevDiag = diag::note_previous_builtin_declaration; 2074 } 2075 2076 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2077 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2078 return true; 2079} 2080 2081/// \brief Completes the merge of two function declarations that are 2082/// known to be compatible. 2083/// 2084/// This routine handles the merging of attributes and other 2085/// properties of function declarations form the old declaration to 2086/// the new declaration, once we know that New is in fact a 2087/// redeclaration of Old. 2088/// 2089/// \returns false 2090bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2091 // Merge the attributes 2092 mergeDeclAttributes(New, Old); 2093 2094 // Merge the storage class. 2095 if (Old->getStorageClass() != SC_Extern && 2096 Old->getStorageClass() != SC_None) 2097 New->setStorageClass(Old->getStorageClass()); 2098 2099 // Merge "pure" flag. 2100 if (Old->isPure()) 2101 New->setPure(); 2102 2103 // Merge attributes from the parameters. These can mismatch with K&R 2104 // declarations. 2105 if (New->getNumParams() == Old->getNumParams()) 2106 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2107 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2108 Context); 2109 2110 if (getLangOptions().CPlusPlus) 2111 return MergeCXXFunctionDecl(New, Old); 2112 2113 return false; 2114} 2115 2116 2117void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2118 ObjCMethodDecl *oldMethod) { 2119 // We don't want to merge unavailable and deprecated attributes 2120 // except from interface to implementation. 2121 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2122 2123 // Merge the attributes. 2124 mergeDeclAttributes(newMethod, oldMethod, mergeDeprecation); 2125 2126 // Merge attributes from the parameters. 2127 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2128 for (ObjCMethodDecl::param_iterator 2129 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2130 ni != ne; ++ni, ++oi) 2131 mergeParamDeclAttributes(*ni, *oi, Context); 2132 2133 CheckObjCMethodOverride(newMethod, oldMethod, true); 2134} 2135 2136/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2137/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2138/// emitting diagnostics as appropriate. 2139/// 2140/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2141/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2142/// check them before the initializer is attached. 2143/// 2144void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2145 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2146 return; 2147 2148 QualType MergedT; 2149 if (getLangOptions().CPlusPlus) { 2150 AutoType *AT = New->getType()->getContainedAutoType(); 2151 if (AT && !AT->isDeduced()) { 2152 // We don't know what the new type is until the initializer is attached. 2153 return; 2154 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2155 // These could still be something that needs exception specs checked. 2156 return MergeVarDeclExceptionSpecs(New, Old); 2157 } 2158 // C++ [basic.link]p10: 2159 // [...] the types specified by all declarations referring to a given 2160 // object or function shall be identical, except that declarations for an 2161 // array object can specify array types that differ by the presence or 2162 // absence of a major array bound (8.3.4). 2163 else if (Old->getType()->isIncompleteArrayType() && 2164 New->getType()->isArrayType()) { 2165 CanQual<ArrayType> OldArray 2166 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2167 CanQual<ArrayType> NewArray 2168 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2169 if (OldArray->getElementType() == NewArray->getElementType()) 2170 MergedT = New->getType(); 2171 } else if (Old->getType()->isArrayType() && 2172 New->getType()->isIncompleteArrayType()) { 2173 CanQual<ArrayType> OldArray 2174 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2175 CanQual<ArrayType> NewArray 2176 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2177 if (OldArray->getElementType() == NewArray->getElementType()) 2178 MergedT = Old->getType(); 2179 } else if (New->getType()->isObjCObjectPointerType() 2180 && Old->getType()->isObjCObjectPointerType()) { 2181 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2182 Old->getType()); 2183 } 2184 } else { 2185 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2186 } 2187 if (MergedT.isNull()) { 2188 Diag(New->getLocation(), diag::err_redefinition_different_type) 2189 << New->getDeclName(); 2190 Diag(Old->getLocation(), diag::note_previous_definition); 2191 return New->setInvalidDecl(); 2192 } 2193 New->setType(MergedT); 2194} 2195 2196/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2197/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2198/// situation, merging decls or emitting diagnostics as appropriate. 2199/// 2200/// Tentative definition rules (C99 6.9.2p2) are checked by 2201/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2202/// definitions here, since the initializer hasn't been attached. 2203/// 2204void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2205 // If the new decl is already invalid, don't do any other checking. 2206 if (New->isInvalidDecl()) 2207 return; 2208 2209 // Verify the old decl was also a variable. 2210 VarDecl *Old = 0; 2211 if (!Previous.isSingleResult() || 2212 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2213 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2214 << New->getDeclName(); 2215 Diag(Previous.getRepresentativeDecl()->getLocation(), 2216 diag::note_previous_definition); 2217 return New->setInvalidDecl(); 2218 } 2219 2220 // C++ [class.mem]p1: 2221 // A member shall not be declared twice in the member-specification [...] 2222 // 2223 // Here, we need only consider static data members. 2224 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2225 Diag(New->getLocation(), diag::err_duplicate_member) 2226 << New->getIdentifier(); 2227 Diag(Old->getLocation(), diag::note_previous_declaration); 2228 New->setInvalidDecl(); 2229 } 2230 2231 mergeDeclAttributes(New, Old); 2232 // Warn if an already-declared variable is made a weak_import in a subsequent 2233 // declaration 2234 if (New->getAttr<WeakImportAttr>() && 2235 Old->getStorageClass() == SC_None && 2236 !Old->getAttr<WeakImportAttr>()) { 2237 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2238 Diag(Old->getLocation(), diag::note_previous_definition); 2239 // Remove weak_import attribute on new declaration. 2240 New->dropAttr<WeakImportAttr>(); 2241 } 2242 2243 // Merge the types. 2244 MergeVarDeclTypes(New, Old); 2245 if (New->isInvalidDecl()) 2246 return; 2247 2248 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2249 if (New->getStorageClass() == SC_Static && 2250 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2251 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2252 Diag(Old->getLocation(), diag::note_previous_definition); 2253 return New->setInvalidDecl(); 2254 } 2255 // C99 6.2.2p4: 2256 // For an identifier declared with the storage-class specifier 2257 // extern in a scope in which a prior declaration of that 2258 // identifier is visible,23) if the prior declaration specifies 2259 // internal or external linkage, the linkage of the identifier at 2260 // the later declaration is the same as the linkage specified at 2261 // the prior declaration. If no prior declaration is visible, or 2262 // if the prior declaration specifies no linkage, then the 2263 // identifier has external linkage. 2264 if (New->hasExternalStorage() && Old->hasLinkage()) 2265 /* Okay */; 2266 else if (New->getStorageClass() != SC_Static && 2267 Old->getStorageClass() == SC_Static) { 2268 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2269 Diag(Old->getLocation(), diag::note_previous_definition); 2270 return New->setInvalidDecl(); 2271 } 2272 2273 // Check if extern is followed by non-extern and vice-versa. 2274 if (New->hasExternalStorage() && 2275 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2276 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2277 Diag(Old->getLocation(), diag::note_previous_definition); 2278 return New->setInvalidDecl(); 2279 } 2280 if (Old->hasExternalStorage() && 2281 !New->hasLinkage() && New->isLocalVarDecl()) { 2282 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2283 Diag(Old->getLocation(), diag::note_previous_definition); 2284 return New->setInvalidDecl(); 2285 } 2286 2287 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2288 2289 // FIXME: The test for external storage here seems wrong? We still 2290 // need to check for mismatches. 2291 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2292 // Don't complain about out-of-line definitions of static members. 2293 !(Old->getLexicalDeclContext()->isRecord() && 2294 !New->getLexicalDeclContext()->isRecord())) { 2295 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2296 Diag(Old->getLocation(), diag::note_previous_definition); 2297 return New->setInvalidDecl(); 2298 } 2299 2300 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2301 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2302 Diag(Old->getLocation(), diag::note_previous_definition); 2303 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2304 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2305 Diag(Old->getLocation(), diag::note_previous_definition); 2306 } 2307 2308 // C++ doesn't have tentative definitions, so go right ahead and check here. 2309 const VarDecl *Def; 2310 if (getLangOptions().CPlusPlus && 2311 New->isThisDeclarationADefinition() == VarDecl::Definition && 2312 (Def = Old->getDefinition())) { 2313 Diag(New->getLocation(), diag::err_redefinition) 2314 << New->getDeclName(); 2315 Diag(Def->getLocation(), diag::note_previous_definition); 2316 New->setInvalidDecl(); 2317 return; 2318 } 2319 // c99 6.2.2 P4. 2320 // For an identifier declared with the storage-class specifier extern in a 2321 // scope in which a prior declaration of that identifier is visible, if 2322 // the prior declaration specifies internal or external linkage, the linkage 2323 // of the identifier at the later declaration is the same as the linkage 2324 // specified at the prior declaration. 2325 // FIXME. revisit this code. 2326 if (New->hasExternalStorage() && 2327 Old->getLinkage() == InternalLinkage && 2328 New->getDeclContext() == Old->getDeclContext()) 2329 New->setStorageClass(Old->getStorageClass()); 2330 2331 // Keep a chain of previous declarations. 2332 New->setPreviousDeclaration(Old); 2333 2334 // Inherit access appropriately. 2335 New->setAccess(Old->getAccess()); 2336} 2337 2338/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2339/// no declarator (e.g. "struct foo;") is parsed. 2340Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2341 DeclSpec &DS) { 2342 return ParsedFreeStandingDeclSpec(S, AS, DS, 2343 MultiTemplateParamsArg(*this, 0, 0)); 2344} 2345 2346/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2347/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2348/// parameters to cope with template friend declarations. 2349Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2350 DeclSpec &DS, 2351 MultiTemplateParamsArg TemplateParams) { 2352 Decl *TagD = 0; 2353 TagDecl *Tag = 0; 2354 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2355 DS.getTypeSpecType() == DeclSpec::TST_struct || 2356 DS.getTypeSpecType() == DeclSpec::TST_union || 2357 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2358 TagD = DS.getRepAsDecl(); 2359 2360 if (!TagD) // We probably had an error 2361 return 0; 2362 2363 // Note that the above type specs guarantee that the 2364 // type rep is a Decl, whereas in many of the others 2365 // it's a Type. 2366 if (isa<TagDecl>(TagD)) 2367 Tag = cast<TagDecl>(TagD); 2368 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2369 Tag = CTD->getTemplatedDecl(); 2370 } 2371 2372 if (Tag) 2373 Tag->setFreeStanding(); 2374 2375 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2376 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2377 // or incomplete types shall not be restrict-qualified." 2378 if (TypeQuals & DeclSpec::TQ_restrict) 2379 Diag(DS.getRestrictSpecLoc(), 2380 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2381 << DS.getSourceRange(); 2382 } 2383 2384 if (DS.isConstexprSpecified()) { 2385 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2386 // and definitions of functions and variables. 2387 if (Tag) 2388 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2389 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2390 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2391 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2392 else 2393 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2394 // Don't emit warnings after this error. 2395 return TagD; 2396 } 2397 2398 if (DS.isFriendSpecified()) { 2399 // If we're dealing with a decl but not a TagDecl, assume that 2400 // whatever routines created it handled the friendship aspect. 2401 if (TagD && !Tag) 2402 return 0; 2403 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2404 } 2405 2406 // Track whether we warned about the fact that there aren't any 2407 // declarators. 2408 bool emittedWarning = false; 2409 2410 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2411 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2412 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2413 if (getLangOptions().CPlusPlus || 2414 Record->getDeclContext()->isRecord()) 2415 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2416 2417 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2418 << DS.getSourceRange(); 2419 emittedWarning = true; 2420 } 2421 } 2422 2423 // Check for Microsoft C extension: anonymous struct. 2424 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2425 CurContext->isRecord() && 2426 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2427 // Handle 2 kinds of anonymous struct: 2428 // struct STRUCT; 2429 // and 2430 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2431 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2432 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2433 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2434 DS.getRepAsType().get()->isStructureType())) { 2435 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2436 << DS.getSourceRange(); 2437 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2438 } 2439 } 2440 2441 if (getLangOptions().CPlusPlus && 2442 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2443 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2444 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2445 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2446 Diag(Enum->getLocation(), diag::ext_no_declarators) 2447 << DS.getSourceRange(); 2448 emittedWarning = true; 2449 } 2450 2451 // Skip all the checks below if we have a type error. 2452 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2453 2454 if (!DS.isMissingDeclaratorOk()) { 2455 // Warn about typedefs of enums without names, since this is an 2456 // extension in both Microsoft and GNU. 2457 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2458 Tag && isa<EnumDecl>(Tag)) { 2459 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2460 << DS.getSourceRange(); 2461 return Tag; 2462 } 2463 2464 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2465 << DS.getSourceRange(); 2466 emittedWarning = true; 2467 } 2468 2469 // We're going to complain about a bunch of spurious specifiers; 2470 // only do this if we're declaring a tag, because otherwise we 2471 // should be getting diag::ext_no_declarators. 2472 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2473 return TagD; 2474 2475 // Note that a linkage-specification sets a storage class, but 2476 // 'extern "C" struct foo;' is actually valid and not theoretically 2477 // useless. 2478 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2479 if (!DS.isExternInLinkageSpec()) 2480 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2481 << DeclSpec::getSpecifierName(scs); 2482 2483 if (DS.isThreadSpecified()) 2484 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2485 if (DS.getTypeQualifiers()) { 2486 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2487 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2488 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2489 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2490 // Restrict is covered above. 2491 } 2492 if (DS.isInlineSpecified()) 2493 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2494 if (DS.isVirtualSpecified()) 2495 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2496 if (DS.isExplicitSpecified()) 2497 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2498 2499 if (DS.isModulePrivateSpecified() && 2500 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2501 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2502 << Tag->getTagKind() 2503 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2504 2505 // Warn about ignored type attributes, for example: 2506 // __attribute__((aligned)) struct A; 2507 // Attributes should be placed after tag to apply to type declaration. 2508 if (!DS.getAttributes().empty()) { 2509 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2510 if (TypeSpecType == DeclSpec::TST_class || 2511 TypeSpecType == DeclSpec::TST_struct || 2512 TypeSpecType == DeclSpec::TST_union || 2513 TypeSpecType == DeclSpec::TST_enum) { 2514 AttributeList* attrs = DS.getAttributes().getList(); 2515 while (attrs) { 2516 Diag(attrs->getScopeLoc(), 2517 diag::warn_declspec_attribute_ignored) 2518 << attrs->getName() 2519 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2520 TypeSpecType == DeclSpec::TST_struct ? 1 : 2521 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2522 attrs = attrs->getNext(); 2523 } 2524 } 2525 } 2526 2527 return TagD; 2528} 2529 2530/// We are trying to inject an anonymous member into the given scope; 2531/// check if there's an existing declaration that can't be overloaded. 2532/// 2533/// \return true if this is a forbidden redeclaration 2534static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2535 Scope *S, 2536 DeclContext *Owner, 2537 DeclarationName Name, 2538 SourceLocation NameLoc, 2539 unsigned diagnostic) { 2540 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2541 Sema::ForRedeclaration); 2542 if (!SemaRef.LookupName(R, S)) return false; 2543 2544 if (R.getAsSingle<TagDecl>()) 2545 return false; 2546 2547 // Pick a representative declaration. 2548 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2549 assert(PrevDecl && "Expected a non-null Decl"); 2550 2551 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2552 return false; 2553 2554 SemaRef.Diag(NameLoc, diagnostic) << Name; 2555 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2556 2557 return true; 2558} 2559 2560/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2561/// anonymous struct or union AnonRecord into the owning context Owner 2562/// and scope S. This routine will be invoked just after we realize 2563/// that an unnamed union or struct is actually an anonymous union or 2564/// struct, e.g., 2565/// 2566/// @code 2567/// union { 2568/// int i; 2569/// float f; 2570/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2571/// // f into the surrounding scope.x 2572/// @endcode 2573/// 2574/// This routine is recursive, injecting the names of nested anonymous 2575/// structs/unions into the owning context and scope as well. 2576static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2577 DeclContext *Owner, 2578 RecordDecl *AnonRecord, 2579 AccessSpecifier AS, 2580 SmallVector<NamedDecl*, 2> &Chaining, 2581 bool MSAnonStruct) { 2582 unsigned diagKind 2583 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2584 : diag::err_anonymous_struct_member_redecl; 2585 2586 bool Invalid = false; 2587 2588 // Look every FieldDecl and IndirectFieldDecl with a name. 2589 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2590 DEnd = AnonRecord->decls_end(); 2591 D != DEnd; ++D) { 2592 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2593 cast<NamedDecl>(*D)->getDeclName()) { 2594 ValueDecl *VD = cast<ValueDecl>(*D); 2595 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2596 VD->getLocation(), diagKind)) { 2597 // C++ [class.union]p2: 2598 // The names of the members of an anonymous union shall be 2599 // distinct from the names of any other entity in the 2600 // scope in which the anonymous union is declared. 2601 Invalid = true; 2602 } else { 2603 // C++ [class.union]p2: 2604 // For the purpose of name lookup, after the anonymous union 2605 // definition, the members of the anonymous union are 2606 // considered to have been defined in the scope in which the 2607 // anonymous union is declared. 2608 unsigned OldChainingSize = Chaining.size(); 2609 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2610 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2611 PE = IF->chain_end(); PI != PE; ++PI) 2612 Chaining.push_back(*PI); 2613 else 2614 Chaining.push_back(VD); 2615 2616 assert(Chaining.size() >= 2); 2617 NamedDecl **NamedChain = 2618 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2619 for (unsigned i = 0; i < Chaining.size(); i++) 2620 NamedChain[i] = Chaining[i]; 2621 2622 IndirectFieldDecl* IndirectField = 2623 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2624 VD->getIdentifier(), VD->getType(), 2625 NamedChain, Chaining.size()); 2626 2627 IndirectField->setAccess(AS); 2628 IndirectField->setImplicit(); 2629 SemaRef.PushOnScopeChains(IndirectField, S); 2630 2631 // That includes picking up the appropriate access specifier. 2632 if (AS != AS_none) IndirectField->setAccess(AS); 2633 2634 Chaining.resize(OldChainingSize); 2635 } 2636 } 2637 } 2638 2639 return Invalid; 2640} 2641 2642/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2643/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2644/// illegal input values are mapped to SC_None. 2645static StorageClass 2646StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2647 switch (StorageClassSpec) { 2648 case DeclSpec::SCS_unspecified: return SC_None; 2649 case DeclSpec::SCS_extern: return SC_Extern; 2650 case DeclSpec::SCS_static: return SC_Static; 2651 case DeclSpec::SCS_auto: return SC_Auto; 2652 case DeclSpec::SCS_register: return SC_Register; 2653 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2654 // Illegal SCSs map to None: error reporting is up to the caller. 2655 case DeclSpec::SCS_mutable: // Fall through. 2656 case DeclSpec::SCS_typedef: return SC_None; 2657 } 2658 llvm_unreachable("unknown storage class specifier"); 2659} 2660 2661/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2662/// a StorageClass. Any error reporting is up to the caller: 2663/// illegal input values are mapped to SC_None. 2664static StorageClass 2665StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2666 switch (StorageClassSpec) { 2667 case DeclSpec::SCS_unspecified: return SC_None; 2668 case DeclSpec::SCS_extern: return SC_Extern; 2669 case DeclSpec::SCS_static: return SC_Static; 2670 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2671 // Illegal SCSs map to None: error reporting is up to the caller. 2672 case DeclSpec::SCS_auto: // Fall through. 2673 case DeclSpec::SCS_mutable: // Fall through. 2674 case DeclSpec::SCS_register: // Fall through. 2675 case DeclSpec::SCS_typedef: return SC_None; 2676 } 2677 llvm_unreachable("unknown storage class specifier"); 2678} 2679 2680/// BuildAnonymousStructOrUnion - Handle the declaration of an 2681/// anonymous structure or union. Anonymous unions are a C++ feature 2682/// (C++ [class.union]) and a GNU C extension; anonymous structures 2683/// are a GNU C and GNU C++ extension. 2684Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2685 AccessSpecifier AS, 2686 RecordDecl *Record) { 2687 DeclContext *Owner = Record->getDeclContext(); 2688 2689 // Diagnose whether this anonymous struct/union is an extension. 2690 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2691 Diag(Record->getLocation(), diag::ext_anonymous_union); 2692 else if (!Record->isUnion()) 2693 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2694 2695 // C and C++ require different kinds of checks for anonymous 2696 // structs/unions. 2697 bool Invalid = false; 2698 if (getLangOptions().CPlusPlus) { 2699 const char* PrevSpec = 0; 2700 unsigned DiagID; 2701 if (Record->isUnion()) { 2702 // C++ [class.union]p6: 2703 // Anonymous unions declared in a named namespace or in the 2704 // global namespace shall be declared static. 2705 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2706 (isa<TranslationUnitDecl>(Owner) || 2707 (isa<NamespaceDecl>(Owner) && 2708 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2709 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2710 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2711 2712 // Recover by adding 'static'. 2713 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2714 PrevSpec, DiagID); 2715 } 2716 // C++ [class.union]p6: 2717 // A storage class is not allowed in a declaration of an 2718 // anonymous union in a class scope. 2719 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2720 isa<RecordDecl>(Owner)) { 2721 Diag(DS.getStorageClassSpecLoc(), 2722 diag::err_anonymous_union_with_storage_spec) 2723 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2724 2725 // Recover by removing the storage specifier. 2726 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2727 SourceLocation(), 2728 PrevSpec, DiagID); 2729 } 2730 } 2731 2732 // Ignore const/volatile/restrict qualifiers. 2733 if (DS.getTypeQualifiers()) { 2734 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2735 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2736 << Record->isUnion() << 0 2737 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2738 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2739 Diag(DS.getVolatileSpecLoc(), 2740 diag::ext_anonymous_struct_union_qualified) 2741 << Record->isUnion() << 1 2742 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2743 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2744 Diag(DS.getRestrictSpecLoc(), 2745 diag::ext_anonymous_struct_union_qualified) 2746 << Record->isUnion() << 2 2747 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2748 2749 DS.ClearTypeQualifiers(); 2750 } 2751 2752 // C++ [class.union]p2: 2753 // The member-specification of an anonymous union shall only 2754 // define non-static data members. [Note: nested types and 2755 // functions cannot be declared within an anonymous union. ] 2756 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2757 MemEnd = Record->decls_end(); 2758 Mem != MemEnd; ++Mem) { 2759 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2760 // C++ [class.union]p3: 2761 // An anonymous union shall not have private or protected 2762 // members (clause 11). 2763 assert(FD->getAccess() != AS_none); 2764 if (FD->getAccess() != AS_public) { 2765 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2766 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2767 Invalid = true; 2768 } 2769 2770 // C++ [class.union]p1 2771 // An object of a class with a non-trivial constructor, a non-trivial 2772 // copy constructor, a non-trivial destructor, or a non-trivial copy 2773 // assignment operator cannot be a member of a union, nor can an 2774 // array of such objects. 2775 if (CheckNontrivialField(FD)) 2776 Invalid = true; 2777 } else if ((*Mem)->isImplicit()) { 2778 // Any implicit members are fine. 2779 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2780 // This is a type that showed up in an 2781 // elaborated-type-specifier inside the anonymous struct or 2782 // union, but which actually declares a type outside of the 2783 // anonymous struct or union. It's okay. 2784 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2785 if (!MemRecord->isAnonymousStructOrUnion() && 2786 MemRecord->getDeclName()) { 2787 // Visual C++ allows type definition in anonymous struct or union. 2788 if (getLangOptions().MicrosoftExt) 2789 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2790 << (int)Record->isUnion(); 2791 else { 2792 // This is a nested type declaration. 2793 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2794 << (int)Record->isUnion(); 2795 Invalid = true; 2796 } 2797 } 2798 } else if (isa<AccessSpecDecl>(*Mem)) { 2799 // Any access specifier is fine. 2800 } else { 2801 // We have something that isn't a non-static data 2802 // member. Complain about it. 2803 unsigned DK = diag::err_anonymous_record_bad_member; 2804 if (isa<TypeDecl>(*Mem)) 2805 DK = diag::err_anonymous_record_with_type; 2806 else if (isa<FunctionDecl>(*Mem)) 2807 DK = diag::err_anonymous_record_with_function; 2808 else if (isa<VarDecl>(*Mem)) 2809 DK = diag::err_anonymous_record_with_static; 2810 2811 // Visual C++ allows type definition in anonymous struct or union. 2812 if (getLangOptions().MicrosoftExt && 2813 DK == diag::err_anonymous_record_with_type) 2814 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2815 << (int)Record->isUnion(); 2816 else { 2817 Diag((*Mem)->getLocation(), DK) 2818 << (int)Record->isUnion(); 2819 Invalid = true; 2820 } 2821 } 2822 } 2823 } 2824 2825 if (!Record->isUnion() && !Owner->isRecord()) { 2826 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2827 << (int)getLangOptions().CPlusPlus; 2828 Invalid = true; 2829 } 2830 2831 // Mock up a declarator. 2832 Declarator Dc(DS, Declarator::MemberContext); 2833 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2834 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2835 2836 // Create a declaration for this anonymous struct/union. 2837 NamedDecl *Anon = 0; 2838 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2839 Anon = FieldDecl::Create(Context, OwningClass, 2840 DS.getSourceRange().getBegin(), 2841 Record->getLocation(), 2842 /*IdentifierInfo=*/0, 2843 Context.getTypeDeclType(Record), 2844 TInfo, 2845 /*BitWidth=*/0, /*Mutable=*/false, 2846 /*HasInit=*/false); 2847 Anon->setAccess(AS); 2848 if (getLangOptions().CPlusPlus) 2849 FieldCollector->Add(cast<FieldDecl>(Anon)); 2850 } else { 2851 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2852 assert(SCSpec != DeclSpec::SCS_typedef && 2853 "Parser allowed 'typedef' as storage class VarDecl."); 2854 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2855 if (SCSpec == DeclSpec::SCS_mutable) { 2856 // mutable can only appear on non-static class members, so it's always 2857 // an error here 2858 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2859 Invalid = true; 2860 SC = SC_None; 2861 } 2862 SCSpec = DS.getStorageClassSpecAsWritten(); 2863 VarDecl::StorageClass SCAsWritten 2864 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2865 2866 Anon = VarDecl::Create(Context, Owner, 2867 DS.getSourceRange().getBegin(), 2868 Record->getLocation(), /*IdentifierInfo=*/0, 2869 Context.getTypeDeclType(Record), 2870 TInfo, SC, SCAsWritten); 2871 2872 // Default-initialize the implicit variable. This initialization will be 2873 // trivial in almost all cases, except if a union member has an in-class 2874 // initializer: 2875 // union { int n = 0; }; 2876 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2877 } 2878 Anon->setImplicit(); 2879 2880 // Add the anonymous struct/union object to the current 2881 // context. We'll be referencing this object when we refer to one of 2882 // its members. 2883 Owner->addDecl(Anon); 2884 2885 // Inject the members of the anonymous struct/union into the owning 2886 // context and into the identifier resolver chain for name lookup 2887 // purposes. 2888 SmallVector<NamedDecl*, 2> Chain; 2889 Chain.push_back(Anon); 2890 2891 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2892 Chain, false)) 2893 Invalid = true; 2894 2895 // Mark this as an anonymous struct/union type. Note that we do not 2896 // do this until after we have already checked and injected the 2897 // members of this anonymous struct/union type, because otherwise 2898 // the members could be injected twice: once by DeclContext when it 2899 // builds its lookup table, and once by 2900 // InjectAnonymousStructOrUnionMembers. 2901 Record->setAnonymousStructOrUnion(true); 2902 2903 if (Invalid) 2904 Anon->setInvalidDecl(); 2905 2906 return Anon; 2907} 2908 2909/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2910/// Microsoft C anonymous structure. 2911/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2912/// Example: 2913/// 2914/// struct A { int a; }; 2915/// struct B { struct A; int b; }; 2916/// 2917/// void foo() { 2918/// B var; 2919/// var.a = 3; 2920/// } 2921/// 2922Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2923 RecordDecl *Record) { 2924 2925 // If there is no Record, get the record via the typedef. 2926 if (!Record) 2927 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2928 2929 // Mock up a declarator. 2930 Declarator Dc(DS, Declarator::TypeNameContext); 2931 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2932 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2933 2934 // Create a declaration for this anonymous struct. 2935 NamedDecl* Anon = FieldDecl::Create(Context, 2936 cast<RecordDecl>(CurContext), 2937 DS.getSourceRange().getBegin(), 2938 DS.getSourceRange().getBegin(), 2939 /*IdentifierInfo=*/0, 2940 Context.getTypeDeclType(Record), 2941 TInfo, 2942 /*BitWidth=*/0, /*Mutable=*/false, 2943 /*HasInit=*/false); 2944 Anon->setImplicit(); 2945 2946 // Add the anonymous struct object to the current context. 2947 CurContext->addDecl(Anon); 2948 2949 // Inject the members of the anonymous struct into the current 2950 // context and into the identifier resolver chain for name lookup 2951 // purposes. 2952 SmallVector<NamedDecl*, 2> Chain; 2953 Chain.push_back(Anon); 2954 2955 RecordDecl *RecordDef = Record->getDefinition(); 2956 if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2957 RecordDef, AS_none, 2958 Chain, true)) 2959 Anon->setInvalidDecl(); 2960 2961 return Anon; 2962} 2963 2964/// GetNameForDeclarator - Determine the full declaration name for the 2965/// given Declarator. 2966DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2967 return GetNameFromUnqualifiedId(D.getName()); 2968} 2969 2970/// \brief Retrieves the declaration name from a parsed unqualified-id. 2971DeclarationNameInfo 2972Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2973 DeclarationNameInfo NameInfo; 2974 NameInfo.setLoc(Name.StartLocation); 2975 2976 switch (Name.getKind()) { 2977 2978 case UnqualifiedId::IK_ImplicitSelfParam: 2979 case UnqualifiedId::IK_Identifier: 2980 NameInfo.setName(Name.Identifier); 2981 NameInfo.setLoc(Name.StartLocation); 2982 return NameInfo; 2983 2984 case UnqualifiedId::IK_OperatorFunctionId: 2985 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2986 Name.OperatorFunctionId.Operator)); 2987 NameInfo.setLoc(Name.StartLocation); 2988 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2989 = Name.OperatorFunctionId.SymbolLocations[0]; 2990 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2991 = Name.EndLocation.getRawEncoding(); 2992 return NameInfo; 2993 2994 case UnqualifiedId::IK_LiteralOperatorId: 2995 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2996 Name.Identifier)); 2997 NameInfo.setLoc(Name.StartLocation); 2998 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2999 return NameInfo; 3000 3001 case UnqualifiedId::IK_ConversionFunctionId: { 3002 TypeSourceInfo *TInfo; 3003 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 3004 if (Ty.isNull()) 3005 return DeclarationNameInfo(); 3006 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 3007 Context.getCanonicalType(Ty))); 3008 NameInfo.setLoc(Name.StartLocation); 3009 NameInfo.setNamedTypeInfo(TInfo); 3010 return NameInfo; 3011 } 3012 3013 case UnqualifiedId::IK_ConstructorName: { 3014 TypeSourceInfo *TInfo; 3015 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 3016 if (Ty.isNull()) 3017 return DeclarationNameInfo(); 3018 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3019 Context.getCanonicalType(Ty))); 3020 NameInfo.setLoc(Name.StartLocation); 3021 NameInfo.setNamedTypeInfo(TInfo); 3022 return NameInfo; 3023 } 3024 3025 case UnqualifiedId::IK_ConstructorTemplateId: { 3026 // In well-formed code, we can only have a constructor 3027 // template-id that refers to the current context, so go there 3028 // to find the actual type being constructed. 3029 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 3030 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 3031 return DeclarationNameInfo(); 3032 3033 // Determine the type of the class being constructed. 3034 QualType CurClassType = Context.getTypeDeclType(CurClass); 3035 3036 // FIXME: Check two things: that the template-id names the same type as 3037 // CurClassType, and that the template-id does not occur when the name 3038 // was qualified. 3039 3040 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3041 Context.getCanonicalType(CurClassType))); 3042 NameInfo.setLoc(Name.StartLocation); 3043 // FIXME: should we retrieve TypeSourceInfo? 3044 NameInfo.setNamedTypeInfo(0); 3045 return NameInfo; 3046 } 3047 3048 case UnqualifiedId::IK_DestructorName: { 3049 TypeSourceInfo *TInfo; 3050 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3051 if (Ty.isNull()) 3052 return DeclarationNameInfo(); 3053 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3054 Context.getCanonicalType(Ty))); 3055 NameInfo.setLoc(Name.StartLocation); 3056 NameInfo.setNamedTypeInfo(TInfo); 3057 return NameInfo; 3058 } 3059 3060 case UnqualifiedId::IK_TemplateId: { 3061 TemplateName TName = Name.TemplateId->Template.get(); 3062 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3063 return Context.getNameForTemplate(TName, TNameLoc); 3064 } 3065 3066 } // switch (Name.getKind()) 3067 3068 llvm_unreachable("Unknown name kind"); 3069} 3070 3071static QualType getCoreType(QualType Ty) { 3072 do { 3073 if (Ty->isPointerType() || Ty->isReferenceType()) 3074 Ty = Ty->getPointeeType(); 3075 else if (Ty->isArrayType()) 3076 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3077 else 3078 return Ty.withoutLocalFastQualifiers(); 3079 } while (true); 3080} 3081 3082/// hasSimilarParameters - Determine whether the C++ functions Declaration 3083/// and Definition have "nearly" matching parameters. This heuristic is 3084/// used to improve diagnostics in the case where an out-of-line function 3085/// definition doesn't match any declaration within the class or namespace. 3086/// Also sets Params to the list of indices to the parameters that differ 3087/// between the declaration and the definition. If hasSimilarParameters 3088/// returns true and Params is empty, then all of the parameters match. 3089static bool hasSimilarParameters(ASTContext &Context, 3090 FunctionDecl *Declaration, 3091 FunctionDecl *Definition, 3092 llvm::SmallVectorImpl<unsigned> &Params) { 3093 Params.clear(); 3094 if (Declaration->param_size() != Definition->param_size()) 3095 return false; 3096 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3097 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3098 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3099 3100 // The parameter types are identical 3101 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3102 continue; 3103 3104 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3105 QualType DefParamBaseTy = getCoreType(DefParamTy); 3106 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3107 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3108 3109 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3110 (DeclTyName && DeclTyName == DefTyName)) 3111 Params.push_back(Idx); 3112 else // The two parameters aren't even close 3113 return false; 3114 } 3115 3116 return true; 3117} 3118 3119/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3120/// declarator needs to be rebuilt in the current instantiation. 3121/// Any bits of declarator which appear before the name are valid for 3122/// consideration here. That's specifically the type in the decl spec 3123/// and the base type in any member-pointer chunks. 3124static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3125 DeclarationName Name) { 3126 // The types we specifically need to rebuild are: 3127 // - typenames, typeofs, and decltypes 3128 // - types which will become injected class names 3129 // Of course, we also need to rebuild any type referencing such a 3130 // type. It's safest to just say "dependent", but we call out a 3131 // few cases here. 3132 3133 DeclSpec &DS = D.getMutableDeclSpec(); 3134 switch (DS.getTypeSpecType()) { 3135 case DeclSpec::TST_typename: 3136 case DeclSpec::TST_typeofType: 3137 case DeclSpec::TST_decltype: 3138 case DeclSpec::TST_underlyingType: 3139 case DeclSpec::TST_atomic: { 3140 // Grab the type from the parser. 3141 TypeSourceInfo *TSI = 0; 3142 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3143 if (T.isNull() || !T->isDependentType()) break; 3144 3145 // Make sure there's a type source info. This isn't really much 3146 // of a waste; most dependent types should have type source info 3147 // attached already. 3148 if (!TSI) 3149 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3150 3151 // Rebuild the type in the current instantiation. 3152 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3153 if (!TSI) return true; 3154 3155 // Store the new type back in the decl spec. 3156 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3157 DS.UpdateTypeRep(LocType); 3158 break; 3159 } 3160 3161 case DeclSpec::TST_typeofExpr: { 3162 Expr *E = DS.getRepAsExpr(); 3163 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3164 if (Result.isInvalid()) return true; 3165 DS.UpdateExprRep(Result.get()); 3166 break; 3167 } 3168 3169 default: 3170 // Nothing to do for these decl specs. 3171 break; 3172 } 3173 3174 // It doesn't matter what order we do this in. 3175 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3176 DeclaratorChunk &Chunk = D.getTypeObject(I); 3177 3178 // The only type information in the declarator which can come 3179 // before the declaration name is the base type of a member 3180 // pointer. 3181 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3182 continue; 3183 3184 // Rebuild the scope specifier in-place. 3185 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3186 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3187 return true; 3188 } 3189 3190 return false; 3191} 3192 3193Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3194 D.setFunctionDefinitionKind(FDK_Declaration); 3195 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3196 3197 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3198 Dcl->getDeclContext()->isFileContext()) 3199 Dcl->setTopLevelDeclInObjCContainer(); 3200 3201 return Dcl; 3202} 3203 3204/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3205/// If T is the name of a class, then each of the following shall have a 3206/// name different from T: 3207/// - every static data member of class T; 3208/// - every member function of class T 3209/// - every member of class T that is itself a type; 3210/// \returns true if the declaration name violates these rules. 3211bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3212 DeclarationNameInfo NameInfo) { 3213 DeclarationName Name = NameInfo.getName(); 3214 3215 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3216 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3217 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3218 return true; 3219 } 3220 3221 return false; 3222} 3223 3224Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3225 MultiTemplateParamsArg TemplateParamLists) { 3226 // TODO: consider using NameInfo for diagnostic. 3227 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3228 DeclarationName Name = NameInfo.getName(); 3229 3230 // All of these full declarators require an identifier. If it doesn't have 3231 // one, the ParsedFreeStandingDeclSpec action should be used. 3232 if (!Name) { 3233 if (!D.isInvalidType()) // Reject this if we think it is valid. 3234 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3235 diag::err_declarator_need_ident) 3236 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3237 return 0; 3238 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3239 return 0; 3240 3241 // The scope passed in may not be a decl scope. Zip up the scope tree until 3242 // we find one that is. 3243 while ((S->getFlags() & Scope::DeclScope) == 0 || 3244 (S->getFlags() & Scope::TemplateParamScope) != 0) 3245 S = S->getParent(); 3246 3247 DeclContext *DC = CurContext; 3248 if (D.getCXXScopeSpec().isInvalid()) 3249 D.setInvalidType(); 3250 else if (D.getCXXScopeSpec().isSet()) { 3251 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3252 UPPC_DeclarationQualifier)) 3253 return 0; 3254 3255 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3256 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3257 if (!DC) { 3258 // If we could not compute the declaration context, it's because the 3259 // declaration context is dependent but does not refer to a class, 3260 // class template, or class template partial specialization. Complain 3261 // and return early, to avoid the coming semantic disaster. 3262 Diag(D.getIdentifierLoc(), 3263 diag::err_template_qualified_declarator_no_match) 3264 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3265 << D.getCXXScopeSpec().getRange(); 3266 return 0; 3267 } 3268 bool IsDependentContext = DC->isDependentContext(); 3269 3270 if (!IsDependentContext && 3271 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3272 return 0; 3273 3274 if (isa<CXXRecordDecl>(DC)) { 3275 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3276 Diag(D.getIdentifierLoc(), 3277 diag::err_member_def_undefined_record) 3278 << Name << DC << D.getCXXScopeSpec().getRange(); 3279 D.setInvalidType(); 3280 } else if (isa<CXXRecordDecl>(CurContext) && 3281 !D.getDeclSpec().isFriendSpecified()) { 3282 // The user provided a superfluous scope specifier inside a class 3283 // definition: 3284 // 3285 // class X { 3286 // void X::f(); 3287 // }; 3288 if (CurContext->Equals(DC)) { 3289 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3290 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3291 } else { 3292 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3293 << Name << D.getCXXScopeSpec().getRange(); 3294 3295 // C++ constructors and destructors with incorrect scopes can break 3296 // our AST invariants by having the wrong underlying types. If 3297 // that's the case, then drop this declaration entirely. 3298 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3299 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3300 !Context.hasSameType(Name.getCXXNameType(), 3301 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)))) 3302 return 0; 3303 } 3304 3305 // Pretend that this qualifier was not here. 3306 D.getCXXScopeSpec().clear(); 3307 } 3308 } 3309 3310 // Check whether we need to rebuild the type of the given 3311 // declaration in the current instantiation. 3312 if (EnteringContext && IsDependentContext && 3313 TemplateParamLists.size() != 0) { 3314 ContextRAII SavedContext(*this, DC); 3315 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3316 D.setInvalidType(); 3317 } 3318 } 3319 3320 if (DiagnoseClassNameShadow(DC, NameInfo)) 3321 // If this is a typedef, we'll end up spewing multiple diagnostics. 3322 // Just return early; it's safer. 3323 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3324 return 0; 3325 3326 NamedDecl *New; 3327 3328 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3329 QualType R = TInfo->getType(); 3330 3331 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3332 UPPC_DeclarationType)) 3333 D.setInvalidType(); 3334 3335 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3336 ForRedeclaration); 3337 3338 // See if this is a redefinition of a variable in the same scope. 3339 if (!D.getCXXScopeSpec().isSet()) { 3340 bool IsLinkageLookup = false; 3341 3342 // If the declaration we're planning to build will be a function 3343 // or object with linkage, then look for another declaration with 3344 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3345 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3346 /* Do nothing*/; 3347 else if (R->isFunctionType()) { 3348 if (CurContext->isFunctionOrMethod() || 3349 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3350 IsLinkageLookup = true; 3351 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3352 IsLinkageLookup = true; 3353 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3354 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3355 IsLinkageLookup = true; 3356 3357 if (IsLinkageLookup) 3358 Previous.clear(LookupRedeclarationWithLinkage); 3359 3360 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3361 } else { // Something like "int foo::x;" 3362 LookupQualifiedName(Previous, DC); 3363 3364 // Don't consider using declarations as previous declarations for 3365 // out-of-line members. 3366 RemoveUsingDecls(Previous); 3367 3368 // C++ 7.3.1.2p2: 3369 // Members (including explicit specializations of templates) of a named 3370 // namespace can also be defined outside that namespace by explicit 3371 // qualification of the name being defined, provided that the entity being 3372 // defined was already declared in the namespace and the definition appears 3373 // after the point of declaration in a namespace that encloses the 3374 // declarations namespace. 3375 // 3376 // Note that we only check the context at this point. We don't yet 3377 // have enough information to make sure that PrevDecl is actually 3378 // the declaration we want to match. For example, given: 3379 // 3380 // class X { 3381 // void f(); 3382 // void f(float); 3383 // }; 3384 // 3385 // void X::f(int) { } // ill-formed 3386 // 3387 // In this case, PrevDecl will point to the overload set 3388 // containing the two f's declared in X, but neither of them 3389 // matches. 3390 3391 // First check whether we named the global scope. 3392 if (isa<TranslationUnitDecl>(DC)) { 3393 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3394 << Name << D.getCXXScopeSpec().getRange(); 3395 } else { 3396 DeclContext *Cur = CurContext; 3397 while (isa<LinkageSpecDecl>(Cur)) 3398 Cur = Cur->getParent(); 3399 if (!Cur->Encloses(DC)) { 3400 // The qualifying scope doesn't enclose the original declaration. 3401 // Emit diagnostic based on current scope. 3402 SourceLocation L = D.getIdentifierLoc(); 3403 SourceRange R = D.getCXXScopeSpec().getRange(); 3404 if (isa<FunctionDecl>(Cur)) 3405 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3406 else 3407 Diag(L, diag::err_invalid_declarator_scope) 3408 << Name << cast<NamedDecl>(DC) << R; 3409 D.setInvalidType(); 3410 } 3411 3412 // C++11 8.3p1: 3413 // ... "The nested-name-specifier of the qualified declarator-id shall 3414 // not begin with a decltype-specifer" 3415 NestedNameSpecifierLoc SpecLoc = 3416 D.getCXXScopeSpec().getWithLocInContext(Context); 3417 assert(SpecLoc && "A non-empty CXXScopeSpec should have a non-empty " 3418 "NestedNameSpecifierLoc"); 3419 while (SpecLoc.getPrefix()) 3420 SpecLoc = SpecLoc.getPrefix(); 3421 if (dyn_cast_or_null<DecltypeType>( 3422 SpecLoc.getNestedNameSpecifier()->getAsType())) 3423 Diag(SpecLoc.getBeginLoc(), diag::err_decltype_in_declarator) 3424 << SpecLoc.getTypeLoc().getSourceRange(); 3425 } 3426 } 3427 3428 if (Previous.isSingleResult() && 3429 Previous.getFoundDecl()->isTemplateParameter()) { 3430 // Maybe we will complain about the shadowed template parameter. 3431 if (!D.isInvalidType()) 3432 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3433 Previous.getFoundDecl()); 3434 3435 // Just pretend that we didn't see the previous declaration. 3436 Previous.clear(); 3437 } 3438 3439 // In C++, the previous declaration we find might be a tag type 3440 // (class or enum). In this case, the new declaration will hide the 3441 // tag type. Note that this does does not apply if we're declaring a 3442 // typedef (C++ [dcl.typedef]p4). 3443 if (Previous.isSingleTagDecl() && 3444 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3445 Previous.clear(); 3446 3447 bool AddToScope = true; 3448 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3449 if (TemplateParamLists.size()) { 3450 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3451 return 0; 3452 } 3453 3454 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3455 } else if (R->isFunctionType()) { 3456 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3457 move(TemplateParamLists), 3458 AddToScope); 3459 } else { 3460 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3461 move(TemplateParamLists)); 3462 } 3463 3464 if (New == 0) 3465 return 0; 3466 3467 // If this has an identifier and is not an invalid redeclaration or 3468 // function template specialization, add it to the scope stack. 3469 if (New->getDeclName() && AddToScope && 3470 !(D.isRedeclaration() && New->isInvalidDecl())) 3471 PushOnScopeChains(New, S); 3472 3473 return New; 3474} 3475 3476/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3477/// types into constant array types in certain situations which would otherwise 3478/// be errors (for GCC compatibility). 3479static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3480 ASTContext &Context, 3481 bool &SizeIsNegative, 3482 llvm::APSInt &Oversized) { 3483 // This method tries to turn a variable array into a constant 3484 // array even when the size isn't an ICE. This is necessary 3485 // for compatibility with code that depends on gcc's buggy 3486 // constant expression folding, like struct {char x[(int)(char*)2];} 3487 SizeIsNegative = false; 3488 Oversized = 0; 3489 3490 if (T->isDependentType()) 3491 return QualType(); 3492 3493 QualifierCollector Qs; 3494 const Type *Ty = Qs.strip(T); 3495 3496 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3497 QualType Pointee = PTy->getPointeeType(); 3498 QualType FixedType = 3499 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3500 Oversized); 3501 if (FixedType.isNull()) return FixedType; 3502 FixedType = Context.getPointerType(FixedType); 3503 return Qs.apply(Context, FixedType); 3504 } 3505 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3506 QualType Inner = PTy->getInnerType(); 3507 QualType FixedType = 3508 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3509 Oversized); 3510 if (FixedType.isNull()) return FixedType; 3511 FixedType = Context.getParenType(FixedType); 3512 return Qs.apply(Context, FixedType); 3513 } 3514 3515 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3516 if (!VLATy) 3517 return QualType(); 3518 // FIXME: We should probably handle this case 3519 if (VLATy->getElementType()->isVariablyModifiedType()) 3520 return QualType(); 3521 3522 llvm::APSInt Res; 3523 if (!VLATy->getSizeExpr() || 3524 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3525 return QualType(); 3526 3527 // Check whether the array size is negative. 3528 if (Res.isSigned() && Res.isNegative()) { 3529 SizeIsNegative = true; 3530 return QualType(); 3531 } 3532 3533 // Check whether the array is too large to be addressed. 3534 unsigned ActiveSizeBits 3535 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3536 Res); 3537 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3538 Oversized = Res; 3539 return QualType(); 3540 } 3541 3542 return Context.getConstantArrayType(VLATy->getElementType(), 3543 Res, ArrayType::Normal, 0); 3544} 3545 3546/// \brief Register the given locally-scoped external C declaration so 3547/// that it can be found later for redeclarations 3548void 3549Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3550 const LookupResult &Previous, 3551 Scope *S) { 3552 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3553 "Decl is not a locally-scoped decl!"); 3554 // Note that we have a locally-scoped external with this name. 3555 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3556 3557 if (!Previous.isSingleResult()) 3558 return; 3559 3560 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3561 3562 // If there was a previous declaration of this variable, it may be 3563 // in our identifier chain. Update the identifier chain with the new 3564 // declaration. 3565 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3566 // The previous declaration was found on the identifer resolver 3567 // chain, so remove it from its scope. 3568 3569 if (S->isDeclScope(PrevDecl)) { 3570 // Special case for redeclarations in the SAME scope. 3571 // Because this declaration is going to be added to the identifier chain 3572 // later, we should temporarily take it OFF the chain. 3573 IdResolver.RemoveDecl(ND); 3574 3575 } else { 3576 // Find the scope for the original declaration. 3577 while (S && !S->isDeclScope(PrevDecl)) 3578 S = S->getParent(); 3579 } 3580 3581 if (S) 3582 S->RemoveDecl(PrevDecl); 3583 } 3584} 3585 3586llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3587Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3588 if (ExternalSource) { 3589 // Load locally-scoped external decls from the external source. 3590 SmallVector<NamedDecl *, 4> Decls; 3591 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3592 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3593 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3594 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3595 if (Pos == LocallyScopedExternalDecls.end()) 3596 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3597 } 3598 } 3599 3600 return LocallyScopedExternalDecls.find(Name); 3601} 3602 3603/// \brief Diagnose function specifiers on a declaration of an identifier that 3604/// does not identify a function. 3605void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3606 // FIXME: We should probably indicate the identifier in question to avoid 3607 // confusion for constructs like "inline int a(), b;" 3608 if (D.getDeclSpec().isInlineSpecified()) 3609 Diag(D.getDeclSpec().getInlineSpecLoc(), 3610 diag::err_inline_non_function); 3611 3612 if (D.getDeclSpec().isVirtualSpecified()) 3613 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3614 diag::err_virtual_non_function); 3615 3616 if (D.getDeclSpec().isExplicitSpecified()) 3617 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3618 diag::err_explicit_non_function); 3619} 3620 3621NamedDecl* 3622Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3623 TypeSourceInfo *TInfo, LookupResult &Previous) { 3624 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3625 if (D.getCXXScopeSpec().isSet()) { 3626 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3627 << D.getCXXScopeSpec().getRange(); 3628 D.setInvalidType(); 3629 // Pretend we didn't see the scope specifier. 3630 DC = CurContext; 3631 Previous.clear(); 3632 } 3633 3634 if (getLangOptions().CPlusPlus) { 3635 // Check that there are no default arguments (C++ only). 3636 CheckExtraCXXDefaultArguments(D); 3637 } 3638 3639 DiagnoseFunctionSpecifiers(D); 3640 3641 if (D.getDeclSpec().isThreadSpecified()) 3642 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3643 if (D.getDeclSpec().isConstexprSpecified()) 3644 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3645 << 1; 3646 3647 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3648 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3649 << D.getName().getSourceRange(); 3650 return 0; 3651 } 3652 3653 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3654 if (!NewTD) return 0; 3655 3656 // Handle attributes prior to checking for duplicates in MergeVarDecl 3657 ProcessDeclAttributes(S, NewTD, D); 3658 3659 CheckTypedefForVariablyModifiedType(S, NewTD); 3660 3661 bool Redeclaration = D.isRedeclaration(); 3662 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3663 D.setRedeclaration(Redeclaration); 3664 return ND; 3665} 3666 3667void 3668Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3669 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3670 // then it shall have block scope. 3671 // Note that variably modified types must be fixed before merging the decl so 3672 // that redeclarations will match. 3673 QualType T = NewTD->getUnderlyingType(); 3674 if (T->isVariablyModifiedType()) { 3675 getCurFunction()->setHasBranchProtectedScope(); 3676 3677 if (S->getFnParent() == 0) { 3678 bool SizeIsNegative; 3679 llvm::APSInt Oversized; 3680 QualType FixedTy = 3681 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3682 Oversized); 3683 if (!FixedTy.isNull()) { 3684 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3685 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3686 } else { 3687 if (SizeIsNegative) 3688 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3689 else if (T->isVariableArrayType()) 3690 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3691 else if (Oversized.getBoolValue()) 3692 Diag(NewTD->getLocation(), diag::err_array_too_large) 3693 << Oversized.toString(10); 3694 else 3695 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3696 NewTD->setInvalidDecl(); 3697 } 3698 } 3699 } 3700} 3701 3702 3703/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3704/// declares a typedef-name, either using the 'typedef' type specifier or via 3705/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3706NamedDecl* 3707Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3708 LookupResult &Previous, bool &Redeclaration) { 3709 // Merge the decl with the existing one if appropriate. If the decl is 3710 // in an outer scope, it isn't the same thing. 3711 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3712 /*ExplicitInstantiationOrSpecialization=*/false); 3713 if (!Previous.empty()) { 3714 Redeclaration = true; 3715 MergeTypedefNameDecl(NewTD, Previous); 3716 } 3717 3718 // If this is the C FILE type, notify the AST context. 3719 if (IdentifierInfo *II = NewTD->getIdentifier()) 3720 if (!NewTD->isInvalidDecl() && 3721 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3722 if (II->isStr("FILE")) 3723 Context.setFILEDecl(NewTD); 3724 else if (II->isStr("jmp_buf")) 3725 Context.setjmp_bufDecl(NewTD); 3726 else if (II->isStr("sigjmp_buf")) 3727 Context.setsigjmp_bufDecl(NewTD); 3728 else if (II->isStr("ucontext_t")) 3729 Context.setucontext_tDecl(NewTD); 3730 else if (II->isStr("__builtin_va_list")) 3731 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3732 } 3733 3734 return NewTD; 3735} 3736 3737/// \brief Determines whether the given declaration is an out-of-scope 3738/// previous declaration. 3739/// 3740/// This routine should be invoked when name lookup has found a 3741/// previous declaration (PrevDecl) that is not in the scope where a 3742/// new declaration by the same name is being introduced. If the new 3743/// declaration occurs in a local scope, previous declarations with 3744/// linkage may still be considered previous declarations (C99 3745/// 6.2.2p4-5, C++ [basic.link]p6). 3746/// 3747/// \param PrevDecl the previous declaration found by name 3748/// lookup 3749/// 3750/// \param DC the context in which the new declaration is being 3751/// declared. 3752/// 3753/// \returns true if PrevDecl is an out-of-scope previous declaration 3754/// for a new delcaration with the same name. 3755static bool 3756isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3757 ASTContext &Context) { 3758 if (!PrevDecl) 3759 return false; 3760 3761 if (!PrevDecl->hasLinkage()) 3762 return false; 3763 3764 if (Context.getLangOptions().CPlusPlus) { 3765 // C++ [basic.link]p6: 3766 // If there is a visible declaration of an entity with linkage 3767 // having the same name and type, ignoring entities declared 3768 // outside the innermost enclosing namespace scope, the block 3769 // scope declaration declares that same entity and receives the 3770 // linkage of the previous declaration. 3771 DeclContext *OuterContext = DC->getRedeclContext(); 3772 if (!OuterContext->isFunctionOrMethod()) 3773 // This rule only applies to block-scope declarations. 3774 return false; 3775 3776 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3777 if (PrevOuterContext->isRecord()) 3778 // We found a member function: ignore it. 3779 return false; 3780 3781 // Find the innermost enclosing namespace for the new and 3782 // previous declarations. 3783 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3784 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3785 3786 // The previous declaration is in a different namespace, so it 3787 // isn't the same function. 3788 if (!OuterContext->Equals(PrevOuterContext)) 3789 return false; 3790 } 3791 3792 return true; 3793} 3794 3795static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3796 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3797 if (!SS.isSet()) return; 3798 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3799} 3800 3801bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3802 QualType type = decl->getType(); 3803 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3804 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3805 // Various kinds of declaration aren't allowed to be __autoreleasing. 3806 unsigned kind = -1U; 3807 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3808 if (var->hasAttr<BlocksAttr>()) 3809 kind = 0; // __block 3810 else if (!var->hasLocalStorage()) 3811 kind = 1; // global 3812 } else if (isa<ObjCIvarDecl>(decl)) { 3813 kind = 3; // ivar 3814 } else if (isa<FieldDecl>(decl)) { 3815 kind = 2; // field 3816 } 3817 3818 if (kind != -1U) { 3819 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3820 << kind; 3821 } 3822 } else if (lifetime == Qualifiers::OCL_None) { 3823 // Try to infer lifetime. 3824 if (!type->isObjCLifetimeType()) 3825 return false; 3826 3827 lifetime = type->getObjCARCImplicitLifetime(); 3828 type = Context.getLifetimeQualifiedType(type, lifetime); 3829 decl->setType(type); 3830 } 3831 3832 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3833 // Thread-local variables cannot have lifetime. 3834 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3835 var->isThreadSpecified()) { 3836 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3837 << var->getType(); 3838 return true; 3839 } 3840 } 3841 3842 return false; 3843} 3844 3845NamedDecl* 3846Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3847 TypeSourceInfo *TInfo, LookupResult &Previous, 3848 MultiTemplateParamsArg TemplateParamLists) { 3849 QualType R = TInfo->getType(); 3850 DeclarationName Name = GetNameForDeclarator(D).getName(); 3851 3852 // Check that there are no default arguments (C++ only). 3853 if (getLangOptions().CPlusPlus) 3854 CheckExtraCXXDefaultArguments(D); 3855 3856 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3857 assert(SCSpec != DeclSpec::SCS_typedef && 3858 "Parser allowed 'typedef' as storage class VarDecl."); 3859 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3860 if (SCSpec == DeclSpec::SCS_mutable) { 3861 // mutable can only appear on non-static class members, so it's always 3862 // an error here 3863 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3864 D.setInvalidType(); 3865 SC = SC_None; 3866 } 3867 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3868 VarDecl::StorageClass SCAsWritten 3869 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3870 3871 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3872 if (!II) { 3873 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3874 << Name; 3875 return 0; 3876 } 3877 3878 DiagnoseFunctionSpecifiers(D); 3879 3880 if (!DC->isRecord() && S->getFnParent() == 0) { 3881 // C99 6.9p2: The storage-class specifiers auto and register shall not 3882 // appear in the declaration specifiers in an external declaration. 3883 if (SC == SC_Auto || SC == SC_Register) { 3884 3885 // If this is a register variable with an asm label specified, then this 3886 // is a GNU extension. 3887 if (SC == SC_Register && D.getAsmLabel()) 3888 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3889 else 3890 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3891 D.setInvalidType(); 3892 } 3893 } 3894 3895 if (getLangOptions().OpenCL) { 3896 // Set up the special work-group-local storage class for variables in the 3897 // OpenCL __local address space. 3898 if (R.getAddressSpace() == LangAS::opencl_local) 3899 SC = SC_OpenCLWorkGroupLocal; 3900 } 3901 3902 bool isExplicitSpecialization = false; 3903 VarDecl *NewVD; 3904 if (!getLangOptions().CPlusPlus) { 3905 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3906 D.getIdentifierLoc(), II, 3907 R, TInfo, SC, SCAsWritten); 3908 3909 if (D.isInvalidType()) 3910 NewVD->setInvalidDecl(); 3911 } else { 3912 if (DC->isRecord() && !CurContext->isRecord()) { 3913 // This is an out-of-line definition of a static data member. 3914 if (SC == SC_Static) { 3915 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3916 diag::err_static_out_of_line) 3917 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3918 } else if (SC == SC_None) 3919 SC = SC_Static; 3920 } 3921 if (SC == SC_Static) { 3922 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3923 if (RD->isLocalClass()) 3924 Diag(D.getIdentifierLoc(), 3925 diag::err_static_data_member_not_allowed_in_local_class) 3926 << Name << RD->getDeclName(); 3927 3928 // C++ [class.union]p1: If a union contains a static data member, 3929 // the program is ill-formed. 3930 // 3931 // We also disallow static data members in anonymous structs. 3932 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3933 Diag(D.getIdentifierLoc(), 3934 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3935 << Name << RD->isUnion(); 3936 } 3937 } 3938 3939 // Match up the template parameter lists with the scope specifier, then 3940 // determine whether we have a template or a template specialization. 3941 isExplicitSpecialization = false; 3942 bool Invalid = false; 3943 if (TemplateParameterList *TemplateParams 3944 = MatchTemplateParametersToScopeSpecifier( 3945 D.getDeclSpec().getSourceRange().getBegin(), 3946 D.getIdentifierLoc(), 3947 D.getCXXScopeSpec(), 3948 TemplateParamLists.get(), 3949 TemplateParamLists.size(), 3950 /*never a friend*/ false, 3951 isExplicitSpecialization, 3952 Invalid)) { 3953 if (TemplateParams->size() > 0) { 3954 // There is no such thing as a variable template. 3955 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3956 << II 3957 << SourceRange(TemplateParams->getTemplateLoc(), 3958 TemplateParams->getRAngleLoc()); 3959 return 0; 3960 } else { 3961 // There is an extraneous 'template<>' for this variable. Complain 3962 // about it, but allow the declaration of the variable. 3963 Diag(TemplateParams->getTemplateLoc(), 3964 diag::err_template_variable_noparams) 3965 << II 3966 << SourceRange(TemplateParams->getTemplateLoc(), 3967 TemplateParams->getRAngleLoc()); 3968 } 3969 } 3970 3971 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3972 D.getIdentifierLoc(), II, 3973 R, TInfo, SC, SCAsWritten); 3974 3975 // If this decl has an auto type in need of deduction, make a note of the 3976 // Decl so we can diagnose uses of it in its own initializer. 3977 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3978 R->getContainedAutoType()) 3979 ParsingInitForAutoVars.insert(NewVD); 3980 3981 if (D.isInvalidType() || Invalid) 3982 NewVD->setInvalidDecl(); 3983 3984 SetNestedNameSpecifier(NewVD, D); 3985 3986 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3987 NewVD->setTemplateParameterListsInfo(Context, 3988 TemplateParamLists.size(), 3989 TemplateParamLists.release()); 3990 } 3991 3992 if (D.getDeclSpec().isConstexprSpecified()) 3993 NewVD->setConstexpr(true); 3994 } 3995 3996 // Set the lexical context. If the declarator has a C++ scope specifier, the 3997 // lexical context will be different from the semantic context. 3998 NewVD->setLexicalDeclContext(CurContext); 3999 4000 if (D.getDeclSpec().isThreadSpecified()) { 4001 if (NewVD->hasLocalStorage()) 4002 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 4003 else if (!Context.getTargetInfo().isTLSSupported()) 4004 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 4005 else 4006 NewVD->setThreadSpecified(true); 4007 } 4008 4009 if (D.getDeclSpec().isModulePrivateSpecified()) { 4010 if (isExplicitSpecialization) 4011 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 4012 << 2 4013 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4014 else if (NewVD->hasLocalStorage()) 4015 Diag(NewVD->getLocation(), diag::err_module_private_local) 4016 << 0 << NewVD->getDeclName() 4017 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 4018 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4019 else 4020 NewVD->setModulePrivate(); 4021 } 4022 4023 // Handle attributes prior to checking for duplicates in MergeVarDecl 4024 ProcessDeclAttributes(S, NewVD, D); 4025 4026 // In auto-retain/release, infer strong retension for variables of 4027 // retainable type. 4028 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4029 NewVD->setInvalidDecl(); 4030 4031 // Handle GNU asm-label extension (encoded as an attribute). 4032 if (Expr *E = (Expr*)D.getAsmLabel()) { 4033 // The parser guarantees this is a string. 4034 StringLiteral *SE = cast<StringLiteral>(E); 4035 StringRef Label = SE->getString(); 4036 if (S->getFnParent() != 0) { 4037 switch (SC) { 4038 case SC_None: 4039 case SC_Auto: 4040 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4041 break; 4042 case SC_Register: 4043 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4044 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4045 break; 4046 case SC_Static: 4047 case SC_Extern: 4048 case SC_PrivateExtern: 4049 case SC_OpenCLWorkGroupLocal: 4050 break; 4051 } 4052 } 4053 4054 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4055 Context, Label)); 4056 } 4057 4058 // Diagnose shadowed variables before filtering for scope. 4059 if (!D.getCXXScopeSpec().isSet()) 4060 CheckShadow(S, NewVD, Previous); 4061 4062 // Don't consider existing declarations that are in a different 4063 // scope and are out-of-semantic-context declarations (if the new 4064 // declaration has linkage). 4065 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4066 isExplicitSpecialization); 4067 4068 if (!getLangOptions().CPlusPlus) { 4069 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4070 } else { 4071 // Merge the decl with the existing one if appropriate. 4072 if (!Previous.empty()) { 4073 if (Previous.isSingleResult() && 4074 isa<FieldDecl>(Previous.getFoundDecl()) && 4075 D.getCXXScopeSpec().isSet()) { 4076 // The user tried to define a non-static data member 4077 // out-of-line (C++ [dcl.meaning]p1). 4078 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4079 << D.getCXXScopeSpec().getRange(); 4080 Previous.clear(); 4081 NewVD->setInvalidDecl(); 4082 } 4083 } else if (D.getCXXScopeSpec().isSet()) { 4084 // No previous declaration in the qualifying scope. 4085 Diag(D.getIdentifierLoc(), diag::err_no_member) 4086 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4087 << D.getCXXScopeSpec().getRange(); 4088 NewVD->setInvalidDecl(); 4089 } 4090 4091 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4092 4093 // This is an explicit specialization of a static data member. Check it. 4094 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4095 CheckMemberSpecialization(NewVD, Previous)) 4096 NewVD->setInvalidDecl(); 4097 } 4098 4099 // attributes declared post-definition are currently ignored 4100 // FIXME: This should be handled in attribute merging, not 4101 // here. 4102 if (Previous.isSingleResult()) { 4103 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4104 if (Def && (Def = Def->getDefinition()) && 4105 Def != NewVD && D.hasAttributes()) { 4106 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4107 Diag(Def->getLocation(), diag::note_previous_definition); 4108 } 4109 } 4110 4111 // If this is a locally-scoped extern C variable, update the map of 4112 // such variables. 4113 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4114 !NewVD->isInvalidDecl()) 4115 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4116 4117 // If there's a #pragma GCC visibility in scope, and this isn't a class 4118 // member, set the visibility of this variable. 4119 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4120 AddPushedVisibilityAttribute(NewVD); 4121 4122 MarkUnusedFileScopedDecl(NewVD); 4123 4124 return NewVD; 4125} 4126 4127/// \brief Diagnose variable or built-in function shadowing. Implements 4128/// -Wshadow. 4129/// 4130/// This method is called whenever a VarDecl is added to a "useful" 4131/// scope. 4132/// 4133/// \param S the scope in which the shadowing name is being declared 4134/// \param R the lookup of the name 4135/// 4136void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4137 // Return if warning is ignored. 4138 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4139 DiagnosticsEngine::Ignored) 4140 return; 4141 4142 // Don't diagnose declarations at file scope. 4143 if (D->hasGlobalStorage()) 4144 return; 4145 4146 DeclContext *NewDC = D->getDeclContext(); 4147 4148 // Only diagnose if we're shadowing an unambiguous field or variable. 4149 if (R.getResultKind() != LookupResult::Found) 4150 return; 4151 4152 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4153 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4154 return; 4155 4156 // Fields are not shadowed by variables in C++ static methods. 4157 if (isa<FieldDecl>(ShadowedDecl)) 4158 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4159 if (MD->isStatic()) 4160 return; 4161 4162 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4163 if (shadowedVar->isExternC()) { 4164 // For shadowing external vars, make sure that we point to the global 4165 // declaration, not a locally scoped extern declaration. 4166 for (VarDecl::redecl_iterator 4167 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4168 I != E; ++I) 4169 if (I->isFileVarDecl()) { 4170 ShadowedDecl = *I; 4171 break; 4172 } 4173 } 4174 4175 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4176 4177 // Only warn about certain kinds of shadowing for class members. 4178 if (NewDC && NewDC->isRecord()) { 4179 // In particular, don't warn about shadowing non-class members. 4180 if (!OldDC->isRecord()) 4181 return; 4182 4183 // TODO: should we warn about static data members shadowing 4184 // static data members from base classes? 4185 4186 // TODO: don't diagnose for inaccessible shadowed members. 4187 // This is hard to do perfectly because we might friend the 4188 // shadowing context, but that's just a false negative. 4189 } 4190 4191 // Determine what kind of declaration we're shadowing. 4192 unsigned Kind; 4193 if (isa<RecordDecl>(OldDC)) { 4194 if (isa<FieldDecl>(ShadowedDecl)) 4195 Kind = 3; // field 4196 else 4197 Kind = 2; // static data member 4198 } else if (OldDC->isFileContext()) 4199 Kind = 1; // global 4200 else 4201 Kind = 0; // local 4202 4203 DeclarationName Name = R.getLookupName(); 4204 4205 // Emit warning and note. 4206 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4207 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4208} 4209 4210/// \brief Check -Wshadow without the advantage of a previous lookup. 4211void Sema::CheckShadow(Scope *S, VarDecl *D) { 4212 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4213 DiagnosticsEngine::Ignored) 4214 return; 4215 4216 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4217 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4218 LookupName(R, S); 4219 CheckShadow(S, D, R); 4220} 4221 4222/// \brief Perform semantic checking on a newly-created variable 4223/// declaration. 4224/// 4225/// This routine performs all of the type-checking required for a 4226/// variable declaration once it has been built. It is used both to 4227/// check variables after they have been parsed and their declarators 4228/// have been translated into a declaration, and to check variables 4229/// that have been instantiated from a template. 4230/// 4231/// Sets NewVD->isInvalidDecl() if an error was encountered. 4232/// 4233/// Returns true if the variable declaration is a redeclaration. 4234bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4235 LookupResult &Previous) { 4236 // If the decl is already known invalid, don't check it. 4237 if (NewVD->isInvalidDecl()) 4238 return false; 4239 4240 QualType T = NewVD->getType(); 4241 4242 if (T->isObjCObjectType()) { 4243 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4244 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4245 T = Context.getObjCObjectPointerType(T); 4246 NewVD->setType(T); 4247 } 4248 4249 // Emit an error if an address space was applied to decl with local storage. 4250 // This includes arrays of objects with address space qualifiers, but not 4251 // automatic variables that point to other address spaces. 4252 // ISO/IEC TR 18037 S5.1.2 4253 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4254 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4255 NewVD->setInvalidDecl(); 4256 return false; 4257 } 4258 4259 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4260 && !NewVD->hasAttr<BlocksAttr>()) { 4261 if (getLangOptions().getGC() != LangOptions::NonGC) 4262 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4263 else 4264 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4265 } 4266 4267 bool isVM = T->isVariablyModifiedType(); 4268 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4269 NewVD->hasAttr<BlocksAttr>()) 4270 getCurFunction()->setHasBranchProtectedScope(); 4271 4272 if ((isVM && NewVD->hasLinkage()) || 4273 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4274 bool SizeIsNegative; 4275 llvm::APSInt Oversized; 4276 QualType FixedTy = 4277 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4278 Oversized); 4279 4280 if (FixedTy.isNull() && T->isVariableArrayType()) { 4281 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4282 // FIXME: This won't give the correct result for 4283 // int a[10][n]; 4284 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4285 4286 if (NewVD->isFileVarDecl()) 4287 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4288 << SizeRange; 4289 else if (NewVD->getStorageClass() == SC_Static) 4290 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4291 << SizeRange; 4292 else 4293 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4294 << SizeRange; 4295 NewVD->setInvalidDecl(); 4296 return false; 4297 } 4298 4299 if (FixedTy.isNull()) { 4300 if (NewVD->isFileVarDecl()) 4301 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4302 else 4303 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4304 NewVD->setInvalidDecl(); 4305 return false; 4306 } 4307 4308 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4309 NewVD->setType(FixedTy); 4310 } 4311 4312 if (Previous.empty() && NewVD->isExternC()) { 4313 // Since we did not find anything by this name and we're declaring 4314 // an extern "C" variable, look for a non-visible extern "C" 4315 // declaration with the same name. 4316 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4317 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4318 if (Pos != LocallyScopedExternalDecls.end()) 4319 Previous.addDecl(Pos->second); 4320 } 4321 4322 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4323 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4324 << T; 4325 NewVD->setInvalidDecl(); 4326 return false; 4327 } 4328 4329 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4330 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4331 NewVD->setInvalidDecl(); 4332 return false; 4333 } 4334 4335 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4336 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4337 NewVD->setInvalidDecl(); 4338 return false; 4339 } 4340 4341 // Function pointers and references cannot have qualified function type, only 4342 // function pointer-to-members can do that. 4343 QualType Pointee; 4344 unsigned PtrOrRef = 0; 4345 if (const PointerType *Ptr = T->getAs<PointerType>()) 4346 Pointee = Ptr->getPointeeType(); 4347 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4348 Pointee = Ref->getPointeeType(); 4349 PtrOrRef = 1; 4350 } 4351 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4352 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4353 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4354 << PtrOrRef; 4355 NewVD->setInvalidDecl(); 4356 return false; 4357 } 4358 4359 if (!Previous.empty()) { 4360 MergeVarDecl(NewVD, Previous); 4361 return true; 4362 } 4363 return false; 4364} 4365 4366/// \brief Data used with FindOverriddenMethod 4367struct FindOverriddenMethodData { 4368 Sema *S; 4369 CXXMethodDecl *Method; 4370}; 4371 4372/// \brief Member lookup function that determines whether a given C++ 4373/// method overrides a method in a base class, to be used with 4374/// CXXRecordDecl::lookupInBases(). 4375static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4376 CXXBasePath &Path, 4377 void *UserData) { 4378 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4379 4380 FindOverriddenMethodData *Data 4381 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4382 4383 DeclarationName Name = Data->Method->getDeclName(); 4384 4385 // FIXME: Do we care about other names here too? 4386 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4387 // We really want to find the base class destructor here. 4388 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4389 CanQualType CT = Data->S->Context.getCanonicalType(T); 4390 4391 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4392 } 4393 4394 for (Path.Decls = BaseRecord->lookup(Name); 4395 Path.Decls.first != Path.Decls.second; 4396 ++Path.Decls.first) { 4397 NamedDecl *D = *Path.Decls.first; 4398 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4399 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4400 return true; 4401 } 4402 } 4403 4404 return false; 4405} 4406 4407/// AddOverriddenMethods - See if a method overrides any in the base classes, 4408/// and if so, check that it's a valid override and remember it. 4409bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4410 // Look for virtual methods in base classes that this method might override. 4411 CXXBasePaths Paths; 4412 FindOverriddenMethodData Data; 4413 Data.Method = MD; 4414 Data.S = this; 4415 bool AddedAny = false; 4416 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4417 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4418 E = Paths.found_decls_end(); I != E; ++I) { 4419 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4420 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4421 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4422 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4423 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4424 AddedAny = true; 4425 } 4426 } 4427 } 4428 } 4429 4430 return AddedAny; 4431} 4432 4433namespace { 4434 // Struct for holding all of the extra arguments needed by 4435 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4436 struct ActOnFDArgs { 4437 Scope *S; 4438 Declarator &D; 4439 MultiTemplateParamsArg TemplateParamLists; 4440 bool AddToScope; 4441 }; 4442} 4443 4444namespace { 4445 4446// Callback to only accept typo corrections that have a non-zero edit distance. 4447class DifferentNameValidatorCCC : public CorrectionCandidateCallback { 4448 public: 4449 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 4450 return candidate.getEditDistance() > 0; 4451 } 4452}; 4453 4454} 4455 4456/// \brief Generate diagnostics for an invalid function redeclaration. 4457/// 4458/// This routine handles generating the diagnostic messages for an invalid 4459/// function redeclaration, including finding possible similar declarations 4460/// or performing typo correction if there are no previous declarations with 4461/// the same name. 4462/// 4463/// Returns a NamedDecl iff typo correction was performed and substituting in 4464/// the new declaration name does not cause new errors. 4465static NamedDecl* DiagnoseInvalidRedeclaration( 4466 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4467 ActOnFDArgs &ExtraArgs) { 4468 NamedDecl *Result = NULL; 4469 DeclarationName Name = NewFD->getDeclName(); 4470 DeclContext *NewDC = NewFD->getDeclContext(); 4471 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4472 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4473 llvm::SmallVector<unsigned, 1> MismatchedParams; 4474 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4475 TypoCorrection Correction; 4476 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4477 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4478 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4479 : diag::err_member_def_does_not_match; 4480 4481 NewFD->setInvalidDecl(); 4482 SemaRef.LookupQualifiedName(Prev, NewDC); 4483 assert(!Prev.isAmbiguous() && 4484 "Cannot have an ambiguity in previous-declaration lookup"); 4485 DifferentNameValidatorCCC Validator; 4486 if (!Prev.empty()) { 4487 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4488 Func != FuncEnd; ++Func) { 4489 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4490 if (FD && 4491 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4492 // Add 1 to the index so that 0 can mean the mismatch didn't 4493 // involve a parameter 4494 unsigned ParamNum = 4495 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4496 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4497 } 4498 } 4499 // If the qualified name lookup yielded nothing, try typo correction 4500 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4501 Prev.getLookupKind(), 0, 0, 4502 Validator, NewDC))) { 4503 // Trap errors. 4504 Sema::SFINAETrap Trap(SemaRef); 4505 4506 // Set up everything for the call to ActOnFunctionDeclarator 4507 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4508 ExtraArgs.D.getIdentifierLoc()); 4509 Previous.clear(); 4510 Previous.setLookupName(Correction.getCorrection()); 4511 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4512 CDeclEnd = Correction.end(); 4513 CDecl != CDeclEnd; ++CDecl) { 4514 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4515 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4516 MismatchedParams)) { 4517 Previous.addDecl(FD); 4518 } 4519 } 4520 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4521 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4522 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4523 // eliminate the need for the parameter pack ExtraArgs. 4524 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4525 NewFD->getDeclContext(), 4526 NewFD->getTypeSourceInfo(), 4527 Previous, 4528 ExtraArgs.TemplateParamLists, 4529 ExtraArgs.AddToScope); 4530 if (Trap.hasErrorOccurred()) { 4531 // Pretend the typo correction never occurred 4532 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4533 ExtraArgs.D.getIdentifierLoc()); 4534 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4535 Previous.clear(); 4536 Previous.setLookupName(Name); 4537 Result = NULL; 4538 } else { 4539 for (LookupResult::iterator Func = Previous.begin(), 4540 FuncEnd = Previous.end(); 4541 Func != FuncEnd; ++Func) { 4542 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4543 NearMatches.push_back(std::make_pair(FD, 0)); 4544 } 4545 } 4546 if (NearMatches.empty()) { 4547 // Ignore the correction if it didn't yield any close FunctionDecl matches 4548 Correction = TypoCorrection(); 4549 } else { 4550 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4551 : diag::err_member_def_does_not_match_suggest; 4552 } 4553 } 4554 4555 if (Correction) 4556 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4557 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4558 << FixItHint::CreateReplacement( 4559 NewFD->getLocation(), 4560 Correction.getAsString(SemaRef.getLangOptions())); 4561 else 4562 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4563 << Name << NewDC << NewFD->getLocation(); 4564 4565 bool NewFDisConst = false; 4566 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4567 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4568 4569 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4570 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4571 NearMatch != NearMatchEnd; ++NearMatch) { 4572 FunctionDecl *FD = NearMatch->first; 4573 bool FDisConst = false; 4574 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4575 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4576 4577 if (unsigned Idx = NearMatch->second) { 4578 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4579 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4580 diag::note_member_def_close_param_match) 4581 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4582 } else if (Correction) { 4583 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4584 << Correction.getQuoted(SemaRef.getLangOptions()); 4585 } else if (FDisConst != NewFDisConst) { 4586 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4587 << NewFDisConst << FD->getSourceRange().getEnd(); 4588 } else 4589 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4590 } 4591 return Result; 4592} 4593 4594static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4595 Declarator &D) { 4596 switch (D.getDeclSpec().getStorageClassSpec()) { 4597 default: llvm_unreachable("Unknown storage class!"); 4598 case DeclSpec::SCS_auto: 4599 case DeclSpec::SCS_register: 4600 case DeclSpec::SCS_mutable: 4601 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4602 diag::err_typecheck_sclass_func); 4603 D.setInvalidType(); 4604 break; 4605 case DeclSpec::SCS_unspecified: break; 4606 case DeclSpec::SCS_extern: return SC_Extern; 4607 case DeclSpec::SCS_static: { 4608 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4609 // C99 6.7.1p5: 4610 // The declaration of an identifier for a function that has 4611 // block scope shall have no explicit storage-class specifier 4612 // other than extern 4613 // See also (C++ [dcl.stc]p4). 4614 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4615 diag::err_static_block_func); 4616 break; 4617 } else 4618 return SC_Static; 4619 } 4620 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4621 } 4622 4623 // No explicit storage class has already been returned 4624 return SC_None; 4625} 4626 4627static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4628 DeclContext *DC, QualType &R, 4629 TypeSourceInfo *TInfo, 4630 FunctionDecl::StorageClass SC, 4631 bool &IsVirtualOkay) { 4632 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4633 DeclarationName Name = NameInfo.getName(); 4634 4635 FunctionDecl *NewFD = 0; 4636 bool isInline = D.getDeclSpec().isInlineSpecified(); 4637 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4638 FunctionDecl::StorageClass SCAsWritten 4639 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4640 4641 if (!SemaRef.getLangOptions().CPlusPlus) { 4642 // Determine whether the function was written with a 4643 // prototype. This true when: 4644 // - there is a prototype in the declarator, or 4645 // - the type R of the function is some kind of typedef or other reference 4646 // to a type name (which eventually refers to a function type). 4647 bool HasPrototype = 4648 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4649 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4650 4651 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4652 D.getSourceRange().getBegin(), NameInfo, R, 4653 TInfo, SC, SCAsWritten, isInline, 4654 HasPrototype); 4655 if (D.isInvalidType()) 4656 NewFD->setInvalidDecl(); 4657 4658 // Set the lexical context. 4659 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4660 4661 return NewFD; 4662 } 4663 4664 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4665 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4666 4667 // Check that the return type is not an abstract class type. 4668 // For record types, this is done by the AbstractClassUsageDiagnoser once 4669 // the class has been completely parsed. 4670 if (!DC->isRecord() && 4671 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4672 R->getAs<FunctionType>()->getResultType(), 4673 diag::err_abstract_type_in_decl, 4674 SemaRef.AbstractReturnType)) 4675 D.setInvalidType(); 4676 4677 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4678 // This is a C++ constructor declaration. 4679 assert(DC->isRecord() && 4680 "Constructors can only be declared in a member context"); 4681 4682 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4683 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4684 D.getSourceRange().getBegin(), NameInfo, 4685 R, TInfo, isExplicit, isInline, 4686 /*isImplicitlyDeclared=*/false, 4687 isConstexpr); 4688 4689 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4690 // This is a C++ destructor declaration. 4691 if (DC->isRecord()) { 4692 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4693 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4694 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4695 SemaRef.Context, Record, 4696 D.getSourceRange().getBegin(), 4697 NameInfo, R, TInfo, isInline, 4698 /*isImplicitlyDeclared=*/false); 4699 4700 // If the class is complete, then we now create the implicit exception 4701 // specification. If the class is incomplete or dependent, we can't do 4702 // it yet. 4703 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4704 Record->getDefinition() && !Record->isBeingDefined() && 4705 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4706 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4707 } 4708 4709 IsVirtualOkay = true; 4710 return NewDD; 4711 4712 } else { 4713 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4714 D.setInvalidType(); 4715 4716 // Create a FunctionDecl to satisfy the function definition parsing 4717 // code path. 4718 return FunctionDecl::Create(SemaRef.Context, DC, 4719 D.getSourceRange().getBegin(), 4720 D.getIdentifierLoc(), Name, R, TInfo, 4721 SC, SCAsWritten, isInline, 4722 /*hasPrototype=*/true, isConstexpr); 4723 } 4724 4725 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4726 if (!DC->isRecord()) { 4727 SemaRef.Diag(D.getIdentifierLoc(), 4728 diag::err_conv_function_not_member); 4729 return 0; 4730 } 4731 4732 SemaRef.CheckConversionDeclarator(D, R, SC); 4733 IsVirtualOkay = true; 4734 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4735 D.getSourceRange().getBegin(), NameInfo, 4736 R, TInfo, isInline, isExplicit, 4737 isConstexpr, SourceLocation()); 4738 4739 } else if (DC->isRecord()) { 4740 // If the name of the function is the same as the name of the record, 4741 // then this must be an invalid constructor that has a return type. 4742 // (The parser checks for a return type and makes the declarator a 4743 // constructor if it has no return type). 4744 if (Name.getAsIdentifierInfo() && 4745 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4746 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4747 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4748 << SourceRange(D.getIdentifierLoc()); 4749 return 0; 4750 } 4751 4752 bool isStatic = SC == SC_Static; 4753 4754 // [class.free]p1: 4755 // Any allocation function for a class T is a static member 4756 // (even if not explicitly declared static). 4757 if (Name.getCXXOverloadedOperator() == OO_New || 4758 Name.getCXXOverloadedOperator() == OO_Array_New) 4759 isStatic = true; 4760 4761 // [class.free]p6 Any deallocation function for a class X is a static member 4762 // (even if not explicitly declared static). 4763 if (Name.getCXXOverloadedOperator() == OO_Delete || 4764 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4765 isStatic = true; 4766 4767 IsVirtualOkay = !isStatic; 4768 4769 // This is a C++ method declaration. 4770 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4771 D.getSourceRange().getBegin(), NameInfo, R, 4772 TInfo, isStatic, SCAsWritten, isInline, 4773 isConstexpr, SourceLocation()); 4774 4775 } else { 4776 // Determine whether the function was written with a 4777 // prototype. This true when: 4778 // - we're in C++ (where every function has a prototype), 4779 return FunctionDecl::Create(SemaRef.Context, DC, 4780 D.getSourceRange().getBegin(), 4781 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4782 true/*HasPrototype*/, isConstexpr); 4783 } 4784} 4785 4786NamedDecl* 4787Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4788 TypeSourceInfo *TInfo, LookupResult &Previous, 4789 MultiTemplateParamsArg TemplateParamLists, 4790 bool &AddToScope) { 4791 QualType R = TInfo->getType(); 4792 4793 assert(R.getTypePtr()->isFunctionType()); 4794 4795 // TODO: consider using NameInfo for diagnostic. 4796 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4797 DeclarationName Name = NameInfo.getName(); 4798 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4799 4800 if (D.getDeclSpec().isThreadSpecified()) 4801 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4802 4803 // Do not allow returning a objc interface by-value. 4804 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4805 Diag(D.getIdentifierLoc(), 4806 diag::err_object_cannot_be_passed_returned_by_value) << 0 4807 << R->getAs<FunctionType>()->getResultType() 4808 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4809 4810 QualType T = R->getAs<FunctionType>()->getResultType(); 4811 T = Context.getObjCObjectPointerType(T); 4812 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4813 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4814 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4815 FPT->getNumArgs(), EPI); 4816 } 4817 else if (isa<FunctionNoProtoType>(R)) 4818 R = Context.getFunctionNoProtoType(T); 4819 } 4820 4821 bool isFriend = false; 4822 FunctionTemplateDecl *FunctionTemplate = 0; 4823 bool isExplicitSpecialization = false; 4824 bool isFunctionTemplateSpecialization = false; 4825 bool isDependentClassScopeExplicitSpecialization = false; 4826 bool isVirtualOkay = false; 4827 4828 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4829 isVirtualOkay); 4830 if (!NewFD) return 0; 4831 4832 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 4833 NewFD->setTopLevelDeclInObjCContainer(); 4834 4835 if (getLangOptions().CPlusPlus) { 4836 bool isInline = D.getDeclSpec().isInlineSpecified(); 4837 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4838 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4839 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4840 isFriend = D.getDeclSpec().isFriendSpecified(); 4841 if (isFriend && !isInline && D.isFunctionDefinition()) { 4842 // C++ [class.friend]p5 4843 // A function can be defined in a friend declaration of a 4844 // class . . . . Such a function is implicitly inline. 4845 NewFD->setImplicitlyInline(); 4846 } 4847 4848 SetNestedNameSpecifier(NewFD, D); 4849 isExplicitSpecialization = false; 4850 isFunctionTemplateSpecialization = false; 4851 if (D.isInvalidType()) 4852 NewFD->setInvalidDecl(); 4853 4854 // Set the lexical context. If the declarator has a C++ 4855 // scope specifier, or is the object of a friend declaration, the 4856 // lexical context will be different from the semantic context. 4857 NewFD->setLexicalDeclContext(CurContext); 4858 4859 // Match up the template parameter lists with the scope specifier, then 4860 // determine whether we have a template or a template specialization. 4861 bool Invalid = false; 4862 if (TemplateParameterList *TemplateParams 4863 = MatchTemplateParametersToScopeSpecifier( 4864 D.getDeclSpec().getSourceRange().getBegin(), 4865 D.getIdentifierLoc(), 4866 D.getCXXScopeSpec(), 4867 TemplateParamLists.get(), 4868 TemplateParamLists.size(), 4869 isFriend, 4870 isExplicitSpecialization, 4871 Invalid)) { 4872 if (TemplateParams->size() > 0) { 4873 // This is a function template 4874 4875 // Check that we can declare a template here. 4876 if (CheckTemplateDeclScope(S, TemplateParams)) 4877 return 0; 4878 4879 // A destructor cannot be a template. 4880 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4881 Diag(NewFD->getLocation(), diag::err_destructor_template); 4882 return 0; 4883 } 4884 4885 // If we're adding a template to a dependent context, we may need to 4886 // rebuilding some of the types used within the template parameter list, 4887 // now that we know what the current instantiation is. 4888 if (DC->isDependentContext()) { 4889 ContextRAII SavedContext(*this, DC); 4890 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4891 Invalid = true; 4892 } 4893 4894 4895 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4896 NewFD->getLocation(), 4897 Name, TemplateParams, 4898 NewFD); 4899 FunctionTemplate->setLexicalDeclContext(CurContext); 4900 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4901 4902 // For source fidelity, store the other template param lists. 4903 if (TemplateParamLists.size() > 1) { 4904 NewFD->setTemplateParameterListsInfo(Context, 4905 TemplateParamLists.size() - 1, 4906 TemplateParamLists.release()); 4907 } 4908 } else { 4909 // This is a function template specialization. 4910 isFunctionTemplateSpecialization = true; 4911 // For source fidelity, store all the template param lists. 4912 NewFD->setTemplateParameterListsInfo(Context, 4913 TemplateParamLists.size(), 4914 TemplateParamLists.release()); 4915 4916 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4917 if (isFriend) { 4918 // We want to remove the "template<>", found here. 4919 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4920 4921 // If we remove the template<> and the name is not a 4922 // template-id, we're actually silently creating a problem: 4923 // the friend declaration will refer to an untemplated decl, 4924 // and clearly the user wants a template specialization. So 4925 // we need to insert '<>' after the name. 4926 SourceLocation InsertLoc; 4927 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4928 InsertLoc = D.getName().getSourceRange().getEnd(); 4929 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4930 } 4931 4932 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4933 << Name << RemoveRange 4934 << FixItHint::CreateRemoval(RemoveRange) 4935 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4936 } 4937 } 4938 } 4939 else { 4940 // All template param lists were matched against the scope specifier: 4941 // this is NOT (an explicit specialization of) a template. 4942 if (TemplateParamLists.size() > 0) 4943 // For source fidelity, store all the template param lists. 4944 NewFD->setTemplateParameterListsInfo(Context, 4945 TemplateParamLists.size(), 4946 TemplateParamLists.release()); 4947 } 4948 4949 if (Invalid) { 4950 NewFD->setInvalidDecl(); 4951 if (FunctionTemplate) 4952 FunctionTemplate->setInvalidDecl(); 4953 } 4954 4955 // If we see "T var();" at block scope, where T is a class type, it is 4956 // probably an attempt to initialize a variable, not a function declaration. 4957 // We don't catch this case earlier, since there is no ambiguity here. 4958 if (!FunctionTemplate && D.getFunctionDefinitionKind() == FDK_Declaration && 4959 CurContext->isFunctionOrMethod() && 4960 D.getNumTypeObjects() == 1 && D.isFunctionDeclarator() && 4961 D.getDeclSpec().getStorageClassSpecAsWritten() 4962 == DeclSpec::SCS_unspecified) { 4963 QualType T = R->getAs<FunctionType>()->getResultType(); 4964 DeclaratorChunk &C = D.getTypeObject(0); 4965 if (!T->isVoidType() && C.Fun.NumArgs == 0 && !C.Fun.isVariadic && 4966 !C.Fun.TrailingReturnType && 4967 C.Fun.getExceptionSpecType() == EST_None) { 4968 SourceRange ParenRange(C.Loc, C.EndLoc); 4969 Diag(C.Loc, diag::warn_empty_parens_are_function_decl) << ParenRange; 4970 4971 // If the declaration looks like: 4972 // T var1, 4973 // f(); 4974 // and name lookup finds a function named 'f', then the ',' was 4975 // probably intended to be a ';'. 4976 if (!D.isFirstDeclarator() && D.getIdentifier()) { 4977 FullSourceLoc Comma(D.getCommaLoc(), SourceMgr); 4978 FullSourceLoc Name(D.getIdentifierLoc(), SourceMgr); 4979 if (Comma.getFileID() != Name.getFileID() || 4980 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 4981 LookupResult Result(*this, D.getIdentifier(), SourceLocation(), 4982 LookupOrdinaryName); 4983 if (LookupName(Result, S)) 4984 Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 4985 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") << NewFD; 4986 } 4987 } 4988 const CXXRecordDecl *RD = T->getAsCXXRecordDecl(); 4989 // Empty parens mean value-initialization, and no parens mean default 4990 // initialization. These are equivalent if the default constructor is 4991 // user-provided, or if zero-initialization is a no-op. 4992 if (RD && RD->hasDefinition() && 4993 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 4994 Diag(C.Loc, diag::note_empty_parens_default_ctor) 4995 << FixItHint::CreateRemoval(ParenRange); 4996 else if (const char *Init = getFixItZeroInitializerForType(T)) 4997 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 4998 << FixItHint::CreateReplacement(ParenRange, Init); 4999 else if (LangOpts.CPlusPlus0x) 5000 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5001 << FixItHint::CreateReplacement(ParenRange, "{}"); 5002 } 5003 } 5004 5005 // C++ [dcl.fct.spec]p5: 5006 // The virtual specifier shall only be used in declarations of 5007 // nonstatic class member functions that appear within a 5008 // member-specification of a class declaration; see 10.3. 5009 // 5010 if (isVirtual && !NewFD->isInvalidDecl()) { 5011 if (!isVirtualOkay) { 5012 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5013 diag::err_virtual_non_function); 5014 } else if (!CurContext->isRecord()) { 5015 // 'virtual' was specified outside of the class. 5016 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5017 diag::err_virtual_out_of_class) 5018 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5019 } else if (NewFD->getDescribedFunctionTemplate()) { 5020 // C++ [temp.mem]p3: 5021 // A member function template shall not be virtual. 5022 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5023 diag::err_virtual_member_function_template) 5024 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5025 } else { 5026 // Okay: Add virtual to the method. 5027 NewFD->setVirtualAsWritten(true); 5028 } 5029 } 5030 5031 // C++ [dcl.fct.spec]p3: 5032 // The inline specifier shall not appear on a block scope function 5033 // declaration. 5034 if (isInline && !NewFD->isInvalidDecl()) { 5035 if (CurContext->isFunctionOrMethod()) { 5036 // 'inline' is not allowed on block scope function declaration. 5037 Diag(D.getDeclSpec().getInlineSpecLoc(), 5038 diag::err_inline_declaration_block_scope) << Name 5039 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 5040 } 5041 } 5042 5043 // C++ [dcl.fct.spec]p6: 5044 // The explicit specifier shall be used only in the declaration of a 5045 // constructor or conversion function within its class definition; 5046 // see 12.3.1 and 12.3.2. 5047 if (isExplicit && !NewFD->isInvalidDecl()) { 5048 if (!CurContext->isRecord()) { 5049 // 'explicit' was specified outside of the class. 5050 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5051 diag::err_explicit_out_of_class) 5052 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5053 } else if (!isa<CXXConstructorDecl>(NewFD) && 5054 !isa<CXXConversionDecl>(NewFD)) { 5055 // 'explicit' was specified on a function that wasn't a constructor 5056 // or conversion function. 5057 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5058 diag::err_explicit_non_ctor_or_conv_function) 5059 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5060 } 5061 } 5062 5063 if (isConstexpr) { 5064 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 5065 // are implicitly inline. 5066 NewFD->setImplicitlyInline(); 5067 5068 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 5069 // be either constructors or to return a literal type. Therefore, 5070 // destructors cannot be declared constexpr. 5071 if (isa<CXXDestructorDecl>(NewFD)) 5072 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 5073 } 5074 5075 // If __module_private__ was specified, mark the function accordingly. 5076 if (D.getDeclSpec().isModulePrivateSpecified()) { 5077 if (isFunctionTemplateSpecialization) { 5078 SourceLocation ModulePrivateLoc 5079 = D.getDeclSpec().getModulePrivateSpecLoc(); 5080 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5081 << 0 5082 << FixItHint::CreateRemoval(ModulePrivateLoc); 5083 } else { 5084 NewFD->setModulePrivate(); 5085 if (FunctionTemplate) 5086 FunctionTemplate->setModulePrivate(); 5087 } 5088 } 5089 5090 if (isFriend) { 5091 // For now, claim that the objects have no previous declaration. 5092 if (FunctionTemplate) { 5093 FunctionTemplate->setObjectOfFriendDecl(false); 5094 FunctionTemplate->setAccess(AS_public); 5095 } 5096 NewFD->setObjectOfFriendDecl(false); 5097 NewFD->setAccess(AS_public); 5098 } 5099 5100 // If a function is defined as defaulted or deleted, mark it as such now. 5101 switch (D.getFunctionDefinitionKind()) { 5102 case FDK_Declaration: 5103 case FDK_Definition: 5104 break; 5105 5106 case FDK_Defaulted: 5107 NewFD->setDefaulted(); 5108 break; 5109 5110 case FDK_Deleted: 5111 NewFD->setDeletedAsWritten(); 5112 break; 5113 } 5114 5115 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5116 D.isFunctionDefinition()) { 5117 // C++ [class.mfct]p2: 5118 // A member function may be defined (8.4) in its class definition, in 5119 // which case it is an inline member function (7.1.2) 5120 NewFD->setImplicitlyInline(); 5121 } 5122 5123 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5124 !CurContext->isRecord()) { 5125 // C++ [class.static]p1: 5126 // A data or function member of a class may be declared static 5127 // in a class definition, in which case it is a static member of 5128 // the class. 5129 5130 // Complain about the 'static' specifier if it's on an out-of-line 5131 // member function definition. 5132 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5133 diag::err_static_out_of_line) 5134 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5135 } 5136 } 5137 5138 // Filter out previous declarations that don't match the scope. 5139 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5140 isExplicitSpecialization || 5141 isFunctionTemplateSpecialization); 5142 5143 // Handle GNU asm-label extension (encoded as an attribute). 5144 if (Expr *E = (Expr*) D.getAsmLabel()) { 5145 // The parser guarantees this is a string. 5146 StringLiteral *SE = cast<StringLiteral>(E); 5147 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5148 SE->getString())); 5149 } 5150 5151 // Copy the parameter declarations from the declarator D to the function 5152 // declaration NewFD, if they are available. First scavenge them into Params. 5153 SmallVector<ParmVarDecl*, 16> Params; 5154 if (D.isFunctionDeclarator()) { 5155 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5156 5157 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5158 // function that takes no arguments, not a function that takes a 5159 // single void argument. 5160 // We let through "const void" here because Sema::GetTypeForDeclarator 5161 // already checks for that case. 5162 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5163 FTI.ArgInfo[0].Param && 5164 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5165 // Empty arg list, don't push any params. 5166 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5167 5168 // In C++, the empty parameter-type-list must be spelled "void"; a 5169 // typedef of void is not permitted. 5170 if (getLangOptions().CPlusPlus && 5171 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5172 bool IsTypeAlias = false; 5173 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5174 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5175 else if (const TemplateSpecializationType *TST = 5176 Param->getType()->getAs<TemplateSpecializationType>()) 5177 IsTypeAlias = TST->isTypeAlias(); 5178 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5179 << IsTypeAlias; 5180 } 5181 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5182 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5183 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5184 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5185 Param->setDeclContext(NewFD); 5186 Params.push_back(Param); 5187 5188 if (Param->isInvalidDecl()) 5189 NewFD->setInvalidDecl(); 5190 } 5191 } 5192 5193 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5194 // When we're declaring a function with a typedef, typeof, etc as in the 5195 // following example, we'll need to synthesize (unnamed) 5196 // parameters for use in the declaration. 5197 // 5198 // @code 5199 // typedef void fn(int); 5200 // fn f; 5201 // @endcode 5202 5203 // Synthesize a parameter for each argument type. 5204 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5205 AE = FT->arg_type_end(); AI != AE; ++AI) { 5206 ParmVarDecl *Param = 5207 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5208 Param->setScopeInfo(0, Params.size()); 5209 Params.push_back(Param); 5210 } 5211 } else { 5212 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5213 "Should not need args for typedef of non-prototype fn"); 5214 } 5215 5216 // Finally, we know we have the right number of parameters, install them. 5217 NewFD->setParams(Params); 5218 5219 // Process the non-inheritable attributes on this declaration. 5220 ProcessDeclAttributes(S, NewFD, D, 5221 /*NonInheritable=*/true, /*Inheritable=*/false); 5222 5223 if (!getLangOptions().CPlusPlus) { 5224 // Perform semantic checking on the function declaration. 5225 bool isExplicitSpecialization=false; 5226 if (!NewFD->isInvalidDecl()) { 5227 if (NewFD->getResultType()->isVariablyModifiedType()) { 5228 // Functions returning a variably modified type violate C99 6.7.5.2p2 5229 // because all functions have linkage. 5230 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5231 NewFD->setInvalidDecl(); 5232 } else { 5233 if (NewFD->isMain()) 5234 CheckMain(NewFD, D.getDeclSpec()); 5235 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5236 isExplicitSpecialization)); 5237 } 5238 } 5239 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5240 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5241 "previous declaration set still overloaded"); 5242 } else { 5243 // If the declarator is a template-id, translate the parser's template 5244 // argument list into our AST format. 5245 bool HasExplicitTemplateArgs = false; 5246 TemplateArgumentListInfo TemplateArgs; 5247 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5248 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5249 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5250 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5251 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5252 TemplateId->getTemplateArgs(), 5253 TemplateId->NumArgs); 5254 translateTemplateArguments(TemplateArgsPtr, 5255 TemplateArgs); 5256 TemplateArgsPtr.release(); 5257 5258 HasExplicitTemplateArgs = true; 5259 5260 if (NewFD->isInvalidDecl()) { 5261 HasExplicitTemplateArgs = false; 5262 } else if (FunctionTemplate) { 5263 // Function template with explicit template arguments. 5264 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5265 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5266 5267 HasExplicitTemplateArgs = false; 5268 } else if (!isFunctionTemplateSpecialization && 5269 !D.getDeclSpec().isFriendSpecified()) { 5270 // We have encountered something that the user meant to be a 5271 // specialization (because it has explicitly-specified template 5272 // arguments) but that was not introduced with a "template<>" (or had 5273 // too few of them). 5274 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5275 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5276 << FixItHint::CreateInsertion( 5277 D.getDeclSpec().getSourceRange().getBegin(), 5278 "template<> "); 5279 isFunctionTemplateSpecialization = true; 5280 } else { 5281 // "friend void foo<>(int);" is an implicit specialization decl. 5282 isFunctionTemplateSpecialization = true; 5283 } 5284 } else if (isFriend && isFunctionTemplateSpecialization) { 5285 // This combination is only possible in a recovery case; the user 5286 // wrote something like: 5287 // template <> friend void foo(int); 5288 // which we're recovering from as if the user had written: 5289 // friend void foo<>(int); 5290 // Go ahead and fake up a template id. 5291 HasExplicitTemplateArgs = true; 5292 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5293 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5294 } 5295 5296 // If it's a friend (and only if it's a friend), it's possible 5297 // that either the specialized function type or the specialized 5298 // template is dependent, and therefore matching will fail. In 5299 // this case, don't check the specialization yet. 5300 bool InstantiationDependent = false; 5301 if (isFunctionTemplateSpecialization && isFriend && 5302 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5303 TemplateSpecializationType::anyDependentTemplateArguments( 5304 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5305 InstantiationDependent))) { 5306 assert(HasExplicitTemplateArgs && 5307 "friend function specialization without template args"); 5308 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5309 Previous)) 5310 NewFD->setInvalidDecl(); 5311 } else if (isFunctionTemplateSpecialization) { 5312 if (CurContext->isDependentContext() && CurContext->isRecord() 5313 && !isFriend) { 5314 isDependentClassScopeExplicitSpecialization = true; 5315 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5316 diag::ext_function_specialization_in_class : 5317 diag::err_function_specialization_in_class) 5318 << NewFD->getDeclName(); 5319 } else if (CheckFunctionTemplateSpecialization(NewFD, 5320 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5321 Previous)) 5322 NewFD->setInvalidDecl(); 5323 5324 // C++ [dcl.stc]p1: 5325 // A storage-class-specifier shall not be specified in an explicit 5326 // specialization (14.7.3) 5327 if (SC != SC_None) { 5328 if (SC != NewFD->getStorageClass()) 5329 Diag(NewFD->getLocation(), 5330 diag::err_explicit_specialization_inconsistent_storage_class) 5331 << SC 5332 << FixItHint::CreateRemoval( 5333 D.getDeclSpec().getStorageClassSpecLoc()); 5334 5335 else 5336 Diag(NewFD->getLocation(), 5337 diag::ext_explicit_specialization_storage_class) 5338 << FixItHint::CreateRemoval( 5339 D.getDeclSpec().getStorageClassSpecLoc()); 5340 } 5341 5342 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5343 if (CheckMemberSpecialization(NewFD, Previous)) 5344 NewFD->setInvalidDecl(); 5345 } 5346 5347 // Perform semantic checking on the function declaration. 5348 if (!isDependentClassScopeExplicitSpecialization) { 5349 if (NewFD->isInvalidDecl()) { 5350 // If this is a class member, mark the class invalid immediately. 5351 // This avoids some consistency errors later. 5352 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5353 methodDecl->getParent()->setInvalidDecl(); 5354 } else { 5355 if (NewFD->isMain()) 5356 CheckMain(NewFD, D.getDeclSpec()); 5357 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5358 isExplicitSpecialization)); 5359 } 5360 } 5361 5362 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5363 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5364 "previous declaration set still overloaded"); 5365 5366 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5367 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5368 NewFD->setInvalidDecl(); 5369 5370 NamedDecl *PrincipalDecl = (FunctionTemplate 5371 ? cast<NamedDecl>(FunctionTemplate) 5372 : NewFD); 5373 5374 if (isFriend && D.isRedeclaration()) { 5375 AccessSpecifier Access = AS_public; 5376 if (!NewFD->isInvalidDecl()) 5377 Access = NewFD->getPreviousDecl()->getAccess(); 5378 5379 NewFD->setAccess(Access); 5380 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5381 5382 PrincipalDecl->setObjectOfFriendDecl(true); 5383 } 5384 5385 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5386 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5387 PrincipalDecl->setNonMemberOperator(); 5388 5389 // If we have a function template, check the template parameter 5390 // list. This will check and merge default template arguments. 5391 if (FunctionTemplate) { 5392 FunctionTemplateDecl *PrevTemplate = 5393 FunctionTemplate->getPreviousDecl(); 5394 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5395 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5396 D.getDeclSpec().isFriendSpecified() 5397 ? (D.isFunctionDefinition() 5398 ? TPC_FriendFunctionTemplateDefinition 5399 : TPC_FriendFunctionTemplate) 5400 : (D.getCXXScopeSpec().isSet() && 5401 DC && DC->isRecord() && 5402 DC->isDependentContext()) 5403 ? TPC_ClassTemplateMember 5404 : TPC_FunctionTemplate); 5405 } 5406 5407 if (NewFD->isInvalidDecl()) { 5408 // Ignore all the rest of this. 5409 } else if (!D.isRedeclaration()) { 5410 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5411 AddToScope }; 5412 // Fake up an access specifier if it's supposed to be a class member. 5413 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5414 NewFD->setAccess(AS_public); 5415 5416 // Qualified decls generally require a previous declaration. 5417 if (D.getCXXScopeSpec().isSet()) { 5418 // ...with the major exception of templated-scope or 5419 // dependent-scope friend declarations. 5420 5421 // TODO: we currently also suppress this check in dependent 5422 // contexts because (1) the parameter depth will be off when 5423 // matching friend templates and (2) we might actually be 5424 // selecting a friend based on a dependent factor. But there 5425 // are situations where these conditions don't apply and we 5426 // can actually do this check immediately. 5427 if (isFriend && 5428 (TemplateParamLists.size() || 5429 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5430 CurContext->isDependentContext())) { 5431 // ignore these 5432 } else { 5433 // The user tried to provide an out-of-line definition for a 5434 // function that is a member of a class or namespace, but there 5435 // was no such member function declared (C++ [class.mfct]p2, 5436 // C++ [namespace.memdef]p2). For example: 5437 // 5438 // class X { 5439 // void f() const; 5440 // }; 5441 // 5442 // void X::f() { } // ill-formed 5443 // 5444 // Complain about this problem, and attempt to suggest close 5445 // matches (e.g., those that differ only in cv-qualifiers and 5446 // whether the parameter types are references). 5447 5448 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5449 NewFD, 5450 ExtraArgs)) { 5451 AddToScope = ExtraArgs.AddToScope; 5452 return Result; 5453 } 5454 } 5455 5456 // Unqualified local friend declarations are required to resolve 5457 // to something. 5458 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5459 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5460 NewFD, 5461 ExtraArgs)) { 5462 AddToScope = ExtraArgs.AddToScope; 5463 return Result; 5464 } 5465 } 5466 5467 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5468 !isFriend && !isFunctionTemplateSpecialization && 5469 !isExplicitSpecialization) { 5470 // An out-of-line member function declaration must also be a 5471 // definition (C++ [dcl.meaning]p1). 5472 // Note that this is not the case for explicit specializations of 5473 // function templates or member functions of class templates, per 5474 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5475 // extension for compatibility with old SWIG code which likes to 5476 // generate them. 5477 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5478 << D.getCXXScopeSpec().getRange(); 5479 } 5480 } 5481 5482 5483 // Handle attributes. We need to have merged decls when handling attributes 5484 // (for example to check for conflicts, etc). 5485 // FIXME: This needs to happen before we merge declarations. Then, 5486 // let attribute merging cope with attribute conflicts. 5487 ProcessDeclAttributes(S, NewFD, D, 5488 /*NonInheritable=*/false, /*Inheritable=*/true); 5489 5490 // attributes declared post-definition are currently ignored 5491 // FIXME: This should happen during attribute merging 5492 if (D.isRedeclaration() && Previous.isSingleResult()) { 5493 const FunctionDecl *Def; 5494 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5495 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5496 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5497 Diag(Def->getLocation(), diag::note_previous_definition); 5498 } 5499 } 5500 5501 AddKnownFunctionAttributes(NewFD); 5502 5503 if (NewFD->hasAttr<OverloadableAttr>() && 5504 !NewFD->getType()->getAs<FunctionProtoType>()) { 5505 Diag(NewFD->getLocation(), 5506 diag::err_attribute_overloadable_no_prototype) 5507 << NewFD; 5508 5509 // Turn this into a variadic function with no parameters. 5510 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5511 FunctionProtoType::ExtProtoInfo EPI; 5512 EPI.Variadic = true; 5513 EPI.ExtInfo = FT->getExtInfo(); 5514 5515 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5516 NewFD->setType(R); 5517 } 5518 5519 // If there's a #pragma GCC visibility in scope, and this isn't a class 5520 // member, set the visibility of this function. 5521 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5522 AddPushedVisibilityAttribute(NewFD); 5523 5524 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5525 // marking the function. 5526 AddCFAuditedAttribute(NewFD); 5527 5528 // If this is a locally-scoped extern C function, update the 5529 // map of such names. 5530 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5531 && !NewFD->isInvalidDecl()) 5532 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5533 5534 // Set this FunctionDecl's range up to the right paren. 5535 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5536 5537 if (getLangOptions().CPlusPlus) { 5538 if (FunctionTemplate) { 5539 if (NewFD->isInvalidDecl()) 5540 FunctionTemplate->setInvalidDecl(); 5541 return FunctionTemplate; 5542 } 5543 } 5544 5545 MarkUnusedFileScopedDecl(NewFD); 5546 5547 if (getLangOptions().CUDA) 5548 if (IdentifierInfo *II = NewFD->getIdentifier()) 5549 if (!NewFD->isInvalidDecl() && 5550 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5551 if (II->isStr("cudaConfigureCall")) { 5552 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5553 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5554 5555 Context.setcudaConfigureCallDecl(NewFD); 5556 } 5557 } 5558 5559 // Here we have an function template explicit specialization at class scope. 5560 // The actually specialization will be postponed to template instatiation 5561 // time via the ClassScopeFunctionSpecializationDecl node. 5562 if (isDependentClassScopeExplicitSpecialization) { 5563 ClassScopeFunctionSpecializationDecl *NewSpec = 5564 ClassScopeFunctionSpecializationDecl::Create( 5565 Context, CurContext, SourceLocation(), 5566 cast<CXXMethodDecl>(NewFD)); 5567 CurContext->addDecl(NewSpec); 5568 AddToScope = false; 5569 } 5570 5571 return NewFD; 5572} 5573 5574/// \brief Perform semantic checking of a new function declaration. 5575/// 5576/// Performs semantic analysis of the new function declaration 5577/// NewFD. This routine performs all semantic checking that does not 5578/// require the actual declarator involved in the declaration, and is 5579/// used both for the declaration of functions as they are parsed 5580/// (called via ActOnDeclarator) and for the declaration of functions 5581/// that have been instantiated via C++ template instantiation (called 5582/// via InstantiateDecl). 5583/// 5584/// \param IsExplicitSpecialiation whether this new function declaration is 5585/// an explicit specialization of the previous declaration. 5586/// 5587/// This sets NewFD->isInvalidDecl() to true if there was an error. 5588/// 5589/// Returns true if the function declaration is a redeclaration. 5590bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5591 LookupResult &Previous, 5592 bool IsExplicitSpecialization) { 5593 assert(!NewFD->getResultType()->isVariablyModifiedType() 5594 && "Variably modified return types are not handled here"); 5595 5596 // Check for a previous declaration of this name. 5597 if (Previous.empty() && NewFD->isExternC()) { 5598 // Since we did not find anything by this name and we're declaring 5599 // an extern "C" function, look for a non-visible extern "C" 5600 // declaration with the same name. 5601 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5602 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5603 if (Pos != LocallyScopedExternalDecls.end()) 5604 Previous.addDecl(Pos->second); 5605 } 5606 5607 bool Redeclaration = false; 5608 5609 // Merge or overload the declaration with an existing declaration of 5610 // the same name, if appropriate. 5611 if (!Previous.empty()) { 5612 // Determine whether NewFD is an overload of PrevDecl or 5613 // a declaration that requires merging. If it's an overload, 5614 // there's no more work to do here; we'll just add the new 5615 // function to the scope. 5616 5617 NamedDecl *OldDecl = 0; 5618 if (!AllowOverloadingOfFunction(Previous, Context)) { 5619 Redeclaration = true; 5620 OldDecl = Previous.getFoundDecl(); 5621 } else { 5622 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5623 /*NewIsUsingDecl*/ false)) { 5624 case Ovl_Match: 5625 Redeclaration = true; 5626 break; 5627 5628 case Ovl_NonFunction: 5629 Redeclaration = true; 5630 break; 5631 5632 case Ovl_Overload: 5633 Redeclaration = false; 5634 break; 5635 } 5636 5637 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5638 // If a function name is overloadable in C, then every function 5639 // with that name must be marked "overloadable". 5640 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5641 << Redeclaration << NewFD; 5642 NamedDecl *OverloadedDecl = 0; 5643 if (Redeclaration) 5644 OverloadedDecl = OldDecl; 5645 else if (!Previous.empty()) 5646 OverloadedDecl = Previous.getRepresentativeDecl(); 5647 if (OverloadedDecl) 5648 Diag(OverloadedDecl->getLocation(), 5649 diag::note_attribute_overloadable_prev_overload); 5650 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5651 Context)); 5652 } 5653 } 5654 5655 if (Redeclaration) { 5656 // NewFD and OldDecl represent declarations that need to be 5657 // merged. 5658 if (MergeFunctionDecl(NewFD, OldDecl)) { 5659 NewFD->setInvalidDecl(); 5660 return Redeclaration; 5661 } 5662 5663 Previous.clear(); 5664 Previous.addDecl(OldDecl); 5665 5666 if (FunctionTemplateDecl *OldTemplateDecl 5667 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5668 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5669 FunctionTemplateDecl *NewTemplateDecl 5670 = NewFD->getDescribedFunctionTemplate(); 5671 assert(NewTemplateDecl && "Template/non-template mismatch"); 5672 if (CXXMethodDecl *Method 5673 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5674 Method->setAccess(OldTemplateDecl->getAccess()); 5675 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5676 } 5677 5678 // If this is an explicit specialization of a member that is a function 5679 // template, mark it as a member specialization. 5680 if (IsExplicitSpecialization && 5681 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5682 NewTemplateDecl->setMemberSpecialization(); 5683 assert(OldTemplateDecl->isMemberSpecialization()); 5684 } 5685 5686 } else { 5687 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5688 NewFD->setAccess(OldDecl->getAccess()); 5689 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5690 } 5691 } 5692 } 5693 5694 // Semantic checking for this function declaration (in isolation). 5695 if (getLangOptions().CPlusPlus) { 5696 // C++-specific checks. 5697 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5698 CheckConstructor(Constructor); 5699 } else if (CXXDestructorDecl *Destructor = 5700 dyn_cast<CXXDestructorDecl>(NewFD)) { 5701 CXXRecordDecl *Record = Destructor->getParent(); 5702 QualType ClassType = Context.getTypeDeclType(Record); 5703 5704 // FIXME: Shouldn't we be able to perform this check even when the class 5705 // type is dependent? Both gcc and edg can handle that. 5706 if (!ClassType->isDependentType()) { 5707 DeclarationName Name 5708 = Context.DeclarationNames.getCXXDestructorName( 5709 Context.getCanonicalType(ClassType)); 5710 if (NewFD->getDeclName() != Name) { 5711 Diag(NewFD->getLocation(), diag::err_destructor_name); 5712 NewFD->setInvalidDecl(); 5713 return Redeclaration; 5714 } 5715 } 5716 } else if (CXXConversionDecl *Conversion 5717 = dyn_cast<CXXConversionDecl>(NewFD)) { 5718 ActOnConversionDeclarator(Conversion); 5719 } 5720 5721 // Find any virtual functions that this function overrides. 5722 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5723 if (!Method->isFunctionTemplateSpecialization() && 5724 !Method->getDescribedFunctionTemplate()) { 5725 if (AddOverriddenMethods(Method->getParent(), Method)) { 5726 // If the function was marked as "static", we have a problem. 5727 if (NewFD->getStorageClass() == SC_Static) { 5728 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5729 << NewFD->getDeclName(); 5730 for (CXXMethodDecl::method_iterator 5731 Overridden = Method->begin_overridden_methods(), 5732 OverriddenEnd = Method->end_overridden_methods(); 5733 Overridden != OverriddenEnd; 5734 ++Overridden) { 5735 Diag((*Overridden)->getLocation(), 5736 diag::note_overridden_virtual_function); 5737 } 5738 } 5739 } 5740 } 5741 } 5742 5743 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5744 if (NewFD->isOverloadedOperator() && 5745 CheckOverloadedOperatorDeclaration(NewFD)) { 5746 NewFD->setInvalidDecl(); 5747 return Redeclaration; 5748 } 5749 5750 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5751 if (NewFD->getLiteralIdentifier() && 5752 CheckLiteralOperatorDeclaration(NewFD)) { 5753 NewFD->setInvalidDecl(); 5754 return Redeclaration; 5755 } 5756 5757 // In C++, check default arguments now that we have merged decls. Unless 5758 // the lexical context is the class, because in this case this is done 5759 // during delayed parsing anyway. 5760 if (!CurContext->isRecord()) 5761 CheckCXXDefaultArguments(NewFD); 5762 5763 // If this function declares a builtin function, check the type of this 5764 // declaration against the expected type for the builtin. 5765 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5766 ASTContext::GetBuiltinTypeError Error; 5767 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5768 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5769 // The type of this function differs from the type of the builtin, 5770 // so forget about the builtin entirely. 5771 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5772 } 5773 } 5774 } 5775 return Redeclaration; 5776} 5777 5778void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5779 // C++ [basic.start.main]p3: A program that declares main to be inline 5780 // or static is ill-formed. 5781 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5782 // shall not appear in a declaration of main. 5783 // static main is not an error under C99, but we should warn about it. 5784 if (FD->getStorageClass() == SC_Static) 5785 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5786 ? diag::err_static_main : diag::warn_static_main) 5787 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5788 if (FD->isInlineSpecified()) 5789 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5790 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5791 5792 QualType T = FD->getType(); 5793 assert(T->isFunctionType() && "function decl is not of function type"); 5794 const FunctionType* FT = T->getAs<FunctionType>(); 5795 5796 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5797 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5798 FD->setInvalidDecl(true); 5799 } 5800 5801 // Treat protoless main() as nullary. 5802 if (isa<FunctionNoProtoType>(FT)) return; 5803 5804 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5805 unsigned nparams = FTP->getNumArgs(); 5806 assert(FD->getNumParams() == nparams); 5807 5808 bool HasExtraParameters = (nparams > 3); 5809 5810 // Darwin passes an undocumented fourth argument of type char**. If 5811 // other platforms start sprouting these, the logic below will start 5812 // getting shifty. 5813 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5814 HasExtraParameters = false; 5815 5816 if (HasExtraParameters) { 5817 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5818 FD->setInvalidDecl(true); 5819 nparams = 3; 5820 } 5821 5822 // FIXME: a lot of the following diagnostics would be improved 5823 // if we had some location information about types. 5824 5825 QualType CharPP = 5826 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5827 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5828 5829 for (unsigned i = 0; i < nparams; ++i) { 5830 QualType AT = FTP->getArgType(i); 5831 5832 bool mismatch = true; 5833 5834 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5835 mismatch = false; 5836 else if (Expected[i] == CharPP) { 5837 // As an extension, the following forms are okay: 5838 // char const ** 5839 // char const * const * 5840 // char * const * 5841 5842 QualifierCollector qs; 5843 const PointerType* PT; 5844 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5845 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5846 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5847 qs.removeConst(); 5848 mismatch = !qs.empty(); 5849 } 5850 } 5851 5852 if (mismatch) { 5853 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5854 // TODO: suggest replacing given type with expected type 5855 FD->setInvalidDecl(true); 5856 } 5857 } 5858 5859 if (nparams == 1 && !FD->isInvalidDecl()) { 5860 Diag(FD->getLocation(), diag::warn_main_one_arg); 5861 } 5862 5863 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5864 Diag(FD->getLocation(), diag::err_main_template_decl); 5865 FD->setInvalidDecl(); 5866 } 5867} 5868 5869bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5870 // FIXME: Need strict checking. In C89, we need to check for 5871 // any assignment, increment, decrement, function-calls, or 5872 // commas outside of a sizeof. In C99, it's the same list, 5873 // except that the aforementioned are allowed in unevaluated 5874 // expressions. Everything else falls under the 5875 // "may accept other forms of constant expressions" exception. 5876 // (We never end up here for C++, so the constant expression 5877 // rules there don't matter.) 5878 if (Init->isConstantInitializer(Context, false)) 5879 return false; 5880 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5881 << Init->getSourceRange(); 5882 return true; 5883} 5884 5885namespace { 5886 // Visits an initialization expression to see if OrigDecl is evaluated in 5887 // its own initialization and throws a warning if it does. 5888 class SelfReferenceChecker 5889 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5890 Sema &S; 5891 Decl *OrigDecl; 5892 bool isRecordType; 5893 bool isPODType; 5894 5895 public: 5896 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5897 5898 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5899 S(S), OrigDecl(OrigDecl) { 5900 isPODType = false; 5901 isRecordType = false; 5902 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5903 isPODType = VD->getType().isPODType(S.Context); 5904 isRecordType = VD->getType()->isRecordType(); 5905 } 5906 } 5907 5908 void VisitExpr(Expr *E) { 5909 if (isa<ObjCMessageExpr>(*E)) return; 5910 if (isRecordType) { 5911 Expr *expr = E; 5912 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5913 ValueDecl *VD = ME->getMemberDecl(); 5914 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5915 expr = ME->getBase(); 5916 } 5917 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5918 HandleDeclRefExpr(DRE); 5919 return; 5920 } 5921 } 5922 Inherited::VisitExpr(E); 5923 } 5924 5925 void VisitMemberExpr(MemberExpr *E) { 5926 if (E->getType()->canDecayToPointerType()) return; 5927 if (isa<FieldDecl>(E->getMemberDecl())) 5928 if (DeclRefExpr *DRE 5929 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5930 HandleDeclRefExpr(DRE); 5931 return; 5932 } 5933 Inherited::VisitMemberExpr(E); 5934 } 5935 5936 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5937 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5938 (isRecordType && E->getCastKind() == CK_NoOp)) { 5939 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5940 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5941 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5942 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5943 HandleDeclRefExpr(DRE); 5944 return; 5945 } 5946 } 5947 Inherited::VisitImplicitCastExpr(E); 5948 } 5949 5950 void VisitUnaryOperator(UnaryOperator *E) { 5951 // For POD record types, addresses of its own members are well-defined. 5952 if (isRecordType && isPODType) return; 5953 Inherited::VisitUnaryOperator(E); 5954 } 5955 5956 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5957 Decl* ReferenceDecl = DRE->getDecl(); 5958 if (OrigDecl != ReferenceDecl) return; 5959 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5960 Sema::NotForRedeclaration); 5961 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5962 S.PDiag(diag::warn_uninit_self_reference_in_init) 5963 << Result.getLookupName() 5964 << OrigDecl->getLocation() 5965 << DRE->getSourceRange()); 5966 } 5967 }; 5968} 5969 5970/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5971void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5972 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5973} 5974 5975/// AddInitializerToDecl - Adds the initializer Init to the 5976/// declaration dcl. If DirectInit is true, this is C++ direct 5977/// initialization rather than copy initialization. 5978void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5979 bool DirectInit, bool TypeMayContainAuto) { 5980 // If there is no declaration, there was an error parsing it. Just ignore 5981 // the initializer. 5982 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5983 return; 5984 5985 // Check for self-references within variable initializers. 5986 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5987 // Variables declared within a function/method body are handled 5988 // by a dataflow analysis. 5989 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5990 CheckSelfReference(RealDecl, Init); 5991 } 5992 else { 5993 CheckSelfReference(RealDecl, Init); 5994 } 5995 5996 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5997 // With declarators parsed the way they are, the parser cannot 5998 // distinguish between a normal initializer and a pure-specifier. 5999 // Thus this grotesque test. 6000 IntegerLiteral *IL; 6001 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 6002 Context.getCanonicalType(IL->getType()) == Context.IntTy) 6003 CheckPureMethod(Method, Init->getSourceRange()); 6004 else { 6005 Diag(Method->getLocation(), diag::err_member_function_initialization) 6006 << Method->getDeclName() << Init->getSourceRange(); 6007 Method->setInvalidDecl(); 6008 } 6009 return; 6010 } 6011 6012 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6013 if (!VDecl) { 6014 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 6015 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6016 RealDecl->setInvalidDecl(); 6017 return; 6018 } 6019 6020 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6021 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6022 TypeSourceInfo *DeducedType = 0; 6023 if (DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType) == 6024 DAR_Failed) 6025 DiagnoseAutoDeductionFailure(VDecl, Init); 6026 if (!DeducedType) { 6027 RealDecl->setInvalidDecl(); 6028 return; 6029 } 6030 VDecl->setTypeSourceInfo(DeducedType); 6031 VDecl->setType(DeducedType->getType()); 6032 6033 // In ARC, infer lifetime. 6034 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 6035 VDecl->setInvalidDecl(); 6036 6037 // If this is a redeclaration, check that the type we just deduced matches 6038 // the previously declared type. 6039 if (VarDecl *Old = VDecl->getPreviousDecl()) 6040 MergeVarDeclTypes(VDecl, Old); 6041 } 6042 6043 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 6044 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 6045 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6046 VDecl->setInvalidDecl(); 6047 return; 6048 } 6049 6050 6051 // A definition must end up with a complete type, which means it must be 6052 // complete with the restriction that an array type might be completed by the 6053 // initializer; note that later code assumes this restriction. 6054 QualType BaseDeclType = VDecl->getType(); 6055 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 6056 BaseDeclType = Array->getElementType(); 6057 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 6058 diag::err_typecheck_decl_incomplete_type)) { 6059 RealDecl->setInvalidDecl(); 6060 return; 6061 } 6062 6063 // The variable can not have an abstract class type. 6064 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6065 diag::err_abstract_type_in_decl, 6066 AbstractVariableType)) 6067 VDecl->setInvalidDecl(); 6068 6069 const VarDecl *Def; 6070 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6071 Diag(VDecl->getLocation(), diag::err_redefinition) 6072 << VDecl->getDeclName(); 6073 Diag(Def->getLocation(), diag::note_previous_definition); 6074 VDecl->setInvalidDecl(); 6075 return; 6076 } 6077 6078 const VarDecl* PrevInit = 0; 6079 if (getLangOptions().CPlusPlus) { 6080 // C++ [class.static.data]p4 6081 // If a static data member is of const integral or const 6082 // enumeration type, its declaration in the class definition can 6083 // specify a constant-initializer which shall be an integral 6084 // constant expression (5.19). In that case, the member can appear 6085 // in integral constant expressions. The member shall still be 6086 // defined in a namespace scope if it is used in the program and the 6087 // namespace scope definition shall not contain an initializer. 6088 // 6089 // We already performed a redefinition check above, but for static 6090 // data members we also need to check whether there was an in-class 6091 // declaration with an initializer. 6092 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6093 Diag(VDecl->getLocation(), diag::err_redefinition) 6094 << VDecl->getDeclName(); 6095 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6096 return; 6097 } 6098 6099 if (VDecl->hasLocalStorage()) 6100 getCurFunction()->setHasBranchProtectedScope(); 6101 6102 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6103 VDecl->setInvalidDecl(); 6104 return; 6105 } 6106 } 6107 6108 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6109 // a kernel function cannot be initialized." 6110 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6111 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6112 VDecl->setInvalidDecl(); 6113 return; 6114 } 6115 6116 // Get the decls type and save a reference for later, since 6117 // CheckInitializerTypes may change it. 6118 QualType DclT = VDecl->getType(), SavT = DclT; 6119 6120 // Perform the initialization. 6121 if (!VDecl->isInvalidDecl()) { 6122 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6123 InitializationKind Kind 6124 = DirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6125 Init->getLocStart(), 6126 Init->getLocEnd()) 6127 : InitializationKind::CreateCopy(VDecl->getLocation(), 6128 Init->getLocStart()); 6129 6130 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6131 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6132 MultiExprArg(*this, &Init, 1), 6133 &DclT); 6134 if (Result.isInvalid()) { 6135 VDecl->setInvalidDecl(); 6136 return; 6137 } 6138 6139 Init = Result.takeAs<Expr>(); 6140 } 6141 6142 // If the type changed, it means we had an incomplete type that was 6143 // completed by the initializer. For example: 6144 // int ary[] = { 1, 3, 5 }; 6145 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6146 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6147 VDecl->setType(DclT); 6148 Init->setType(DclT.getNonReferenceType()); 6149 } 6150 6151 // Check any implicit conversions within the expression. 6152 CheckImplicitConversions(Init, VDecl->getLocation()); 6153 6154 if (!VDecl->isInvalidDecl()) 6155 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6156 6157 Init = MaybeCreateExprWithCleanups(Init); 6158 // Attach the initializer to the decl. 6159 VDecl->setInit(Init); 6160 6161 if (VDecl->isLocalVarDecl()) { 6162 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6163 // static storage duration shall be constant expressions or string literals. 6164 // C++ does not have this restriction. 6165 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl() && 6166 VDecl->getStorageClass() == SC_Static) 6167 CheckForConstantInitializer(Init, DclT); 6168 } else if (VDecl->isStaticDataMember() && 6169 VDecl->getLexicalDeclContext()->isRecord()) { 6170 // This is an in-class initialization for a static data member, e.g., 6171 // 6172 // struct S { 6173 // static const int value = 17; 6174 // }; 6175 6176 // C++ [class.mem]p4: 6177 // A member-declarator can contain a constant-initializer only 6178 // if it declares a static member (9.4) of const integral or 6179 // const enumeration type, see 9.4.2. 6180 // 6181 // C++11 [class.static.data]p3: 6182 // If a non-volatile const static data member is of integral or 6183 // enumeration type, its declaration in the class definition can 6184 // specify a brace-or-equal-initializer in which every initalizer-clause 6185 // that is an assignment-expression is a constant expression. A static 6186 // data member of literal type can be declared in the class definition 6187 // with the constexpr specifier; if so, its declaration shall specify a 6188 // brace-or-equal-initializer in which every initializer-clause that is 6189 // an assignment-expression is a constant expression. 6190 6191 // Do nothing on dependent types. 6192 if (DclT->isDependentType()) { 6193 6194 // Allow any 'static constexpr' members, whether or not they are of literal 6195 // type. We separately check that the initializer is a constant expression, 6196 // which implicitly requires the member to be of literal type. 6197 } else if (VDecl->isConstexpr()) { 6198 6199 // Require constness. 6200 } else if (!DclT.isConstQualified()) { 6201 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6202 << Init->getSourceRange(); 6203 VDecl->setInvalidDecl(); 6204 6205 // We allow integer constant expressions in all cases. 6206 } else if (DclT->isIntegralOrEnumerationType()) { 6207 // Check whether the expression is a constant expression. 6208 SourceLocation Loc; 6209 if (getLangOptions().CPlusPlus0x && DclT.isVolatileQualified()) 6210 // In C++11, a non-constexpr const static data member with an 6211 // in-class initializer cannot be volatile. 6212 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6213 else if (Init->isValueDependent()) 6214 ; // Nothing to check. 6215 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6216 ; // Ok, it's an ICE! 6217 else if (Init->isEvaluatable(Context)) { 6218 // If we can constant fold the initializer through heroics, accept it, 6219 // but report this as a use of an extension for -pedantic. 6220 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6221 << Init->getSourceRange(); 6222 } else { 6223 // Otherwise, this is some crazy unknown case. Report the issue at the 6224 // location provided by the isIntegerConstantExpr failed check. 6225 Diag(Loc, diag::err_in_class_initializer_non_constant) 6226 << Init->getSourceRange(); 6227 VDecl->setInvalidDecl(); 6228 } 6229 6230 // We allow foldable floating-point constants as an extension. 6231 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6232 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6233 << DclT << Init->getSourceRange(); 6234 if (getLangOptions().CPlusPlus0x) 6235 Diag(VDecl->getLocation(), 6236 diag::note_in_class_initializer_float_type_constexpr) 6237 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6238 6239 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6240 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6241 << Init->getSourceRange(); 6242 VDecl->setInvalidDecl(); 6243 } 6244 6245 // Suggest adding 'constexpr' in C++11 for literal types. 6246 } else if (getLangOptions().CPlusPlus0x && DclT->isLiteralType()) { 6247 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6248 << DclT << Init->getSourceRange() 6249 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6250 VDecl->setConstexpr(true); 6251 6252 } else { 6253 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6254 << DclT << Init->getSourceRange(); 6255 VDecl->setInvalidDecl(); 6256 } 6257 } else if (VDecl->isFileVarDecl()) { 6258 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6259 (!getLangOptions().CPlusPlus || 6260 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6261 Diag(VDecl->getLocation(), diag::warn_extern_init); 6262 6263 // C99 6.7.8p4. All file scoped initializers need to be constant. 6264 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) 6265 CheckForConstantInitializer(Init, DclT); 6266 } 6267 6268 CheckCompleteVariableDeclaration(VDecl); 6269} 6270 6271/// ActOnInitializerError - Given that there was an error parsing an 6272/// initializer for the given declaration, try to return to some form 6273/// of sanity. 6274void Sema::ActOnInitializerError(Decl *D) { 6275 // Our main concern here is re-establishing invariants like "a 6276 // variable's type is either dependent or complete". 6277 if (!D || D->isInvalidDecl()) return; 6278 6279 VarDecl *VD = dyn_cast<VarDecl>(D); 6280 if (!VD) return; 6281 6282 // Auto types are meaningless if we can't make sense of the initializer. 6283 if (ParsingInitForAutoVars.count(D)) { 6284 D->setInvalidDecl(); 6285 return; 6286 } 6287 6288 QualType Ty = VD->getType(); 6289 if (Ty->isDependentType()) return; 6290 6291 // Require a complete type. 6292 if (RequireCompleteType(VD->getLocation(), 6293 Context.getBaseElementType(Ty), 6294 diag::err_typecheck_decl_incomplete_type)) { 6295 VD->setInvalidDecl(); 6296 return; 6297 } 6298 6299 // Require an abstract type. 6300 if (RequireNonAbstractType(VD->getLocation(), Ty, 6301 diag::err_abstract_type_in_decl, 6302 AbstractVariableType)) { 6303 VD->setInvalidDecl(); 6304 return; 6305 } 6306 6307 // Don't bother complaining about constructors or destructors, 6308 // though. 6309} 6310 6311void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6312 bool TypeMayContainAuto) { 6313 // If there is no declaration, there was an error parsing it. Just ignore it. 6314 if (RealDecl == 0) 6315 return; 6316 6317 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6318 QualType Type = Var->getType(); 6319 6320 // C++11 [dcl.spec.auto]p3 6321 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6322 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6323 << Var->getDeclName() << Type; 6324 Var->setInvalidDecl(); 6325 return; 6326 } 6327 6328 // C++11 [class.static.data]p3: A static data member can be declared with 6329 // the constexpr specifier; if so, its declaration shall specify 6330 // a brace-or-equal-initializer. 6331 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6332 // the definition of a variable [...] or the declaration of a static data 6333 // member. 6334 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6335 if (Var->isStaticDataMember()) 6336 Diag(Var->getLocation(), 6337 diag::err_constexpr_static_mem_var_requires_init) 6338 << Var->getDeclName(); 6339 else 6340 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6341 Var->setInvalidDecl(); 6342 return; 6343 } 6344 6345 switch (Var->isThisDeclarationADefinition()) { 6346 case VarDecl::Definition: 6347 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6348 break; 6349 6350 // We have an out-of-line definition of a static data member 6351 // that has an in-class initializer, so we type-check this like 6352 // a declaration. 6353 // 6354 // Fall through 6355 6356 case VarDecl::DeclarationOnly: 6357 // It's only a declaration. 6358 6359 // Block scope. C99 6.7p7: If an identifier for an object is 6360 // declared with no linkage (C99 6.2.2p6), the type for the 6361 // object shall be complete. 6362 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6363 !Var->getLinkage() && !Var->isInvalidDecl() && 6364 RequireCompleteType(Var->getLocation(), Type, 6365 diag::err_typecheck_decl_incomplete_type)) 6366 Var->setInvalidDecl(); 6367 6368 // Make sure that the type is not abstract. 6369 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6370 RequireNonAbstractType(Var->getLocation(), Type, 6371 diag::err_abstract_type_in_decl, 6372 AbstractVariableType)) 6373 Var->setInvalidDecl(); 6374 return; 6375 6376 case VarDecl::TentativeDefinition: 6377 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6378 // object that has file scope without an initializer, and without a 6379 // storage-class specifier or with the storage-class specifier "static", 6380 // constitutes a tentative definition. Note: A tentative definition with 6381 // external linkage is valid (C99 6.2.2p5). 6382 if (!Var->isInvalidDecl()) { 6383 if (const IncompleteArrayType *ArrayT 6384 = Context.getAsIncompleteArrayType(Type)) { 6385 if (RequireCompleteType(Var->getLocation(), 6386 ArrayT->getElementType(), 6387 diag::err_illegal_decl_array_incomplete_type)) 6388 Var->setInvalidDecl(); 6389 } else if (Var->getStorageClass() == SC_Static) { 6390 // C99 6.9.2p3: If the declaration of an identifier for an object is 6391 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6392 // declared type shall not be an incomplete type. 6393 // NOTE: code such as the following 6394 // static struct s; 6395 // struct s { int a; }; 6396 // is accepted by gcc. Hence here we issue a warning instead of 6397 // an error and we do not invalidate the static declaration. 6398 // NOTE: to avoid multiple warnings, only check the first declaration. 6399 if (Var->getPreviousDecl() == 0) 6400 RequireCompleteType(Var->getLocation(), Type, 6401 diag::ext_typecheck_decl_incomplete_type); 6402 } 6403 } 6404 6405 // Record the tentative definition; we're done. 6406 if (!Var->isInvalidDecl()) 6407 TentativeDefinitions.push_back(Var); 6408 return; 6409 } 6410 6411 // Provide a specific diagnostic for uninitialized variable 6412 // definitions with incomplete array type. 6413 if (Type->isIncompleteArrayType()) { 6414 Diag(Var->getLocation(), 6415 diag::err_typecheck_incomplete_array_needs_initializer); 6416 Var->setInvalidDecl(); 6417 return; 6418 } 6419 6420 // Provide a specific diagnostic for uninitialized variable 6421 // definitions with reference type. 6422 if (Type->isReferenceType()) { 6423 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6424 << Var->getDeclName() 6425 << SourceRange(Var->getLocation(), Var->getLocation()); 6426 Var->setInvalidDecl(); 6427 return; 6428 } 6429 6430 // Do not attempt to type-check the default initializer for a 6431 // variable with dependent type. 6432 if (Type->isDependentType()) 6433 return; 6434 6435 if (Var->isInvalidDecl()) 6436 return; 6437 6438 if (RequireCompleteType(Var->getLocation(), 6439 Context.getBaseElementType(Type), 6440 diag::err_typecheck_decl_incomplete_type)) { 6441 Var->setInvalidDecl(); 6442 return; 6443 } 6444 6445 // The variable can not have an abstract class type. 6446 if (RequireNonAbstractType(Var->getLocation(), Type, 6447 diag::err_abstract_type_in_decl, 6448 AbstractVariableType)) { 6449 Var->setInvalidDecl(); 6450 return; 6451 } 6452 6453 // Check for jumps past the implicit initializer. C++0x 6454 // clarifies that this applies to a "variable with automatic 6455 // storage duration", not a "local variable". 6456 // C++11 [stmt.dcl]p3 6457 // A program that jumps from a point where a variable with automatic 6458 // storage duration is not in scope to a point where it is in scope is 6459 // ill-formed unless the variable has scalar type, class type with a 6460 // trivial default constructor and a trivial destructor, a cv-qualified 6461 // version of one of these types, or an array of one of the preceding 6462 // types and is declared without an initializer. 6463 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6464 if (const RecordType *Record 6465 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6466 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6467 // Mark the function for further checking even if the looser rules of 6468 // C++11 do not require such checks, so that we can diagnose 6469 // incompatibilities with C++98. 6470 if (!CXXRecord->isPOD()) 6471 getCurFunction()->setHasBranchProtectedScope(); 6472 } 6473 } 6474 6475 // C++03 [dcl.init]p9: 6476 // If no initializer is specified for an object, and the 6477 // object is of (possibly cv-qualified) non-POD class type (or 6478 // array thereof), the object shall be default-initialized; if 6479 // the object is of const-qualified type, the underlying class 6480 // type shall have a user-declared default 6481 // constructor. Otherwise, if no initializer is specified for 6482 // a non- static object, the object and its subobjects, if 6483 // any, have an indeterminate initial value); if the object 6484 // or any of its subobjects are of const-qualified type, the 6485 // program is ill-formed. 6486 // C++0x [dcl.init]p11: 6487 // If no initializer is specified for an object, the object is 6488 // default-initialized; [...]. 6489 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6490 InitializationKind Kind 6491 = InitializationKind::CreateDefault(Var->getLocation()); 6492 6493 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6494 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6495 MultiExprArg(*this, 0, 0)); 6496 if (Init.isInvalid()) 6497 Var->setInvalidDecl(); 6498 else if (Init.get()) 6499 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6500 6501 CheckCompleteVariableDeclaration(Var); 6502 } 6503} 6504 6505void Sema::ActOnCXXForRangeDecl(Decl *D) { 6506 VarDecl *VD = dyn_cast<VarDecl>(D); 6507 if (!VD) { 6508 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6509 D->setInvalidDecl(); 6510 return; 6511 } 6512 6513 VD->setCXXForRangeDecl(true); 6514 6515 // for-range-declaration cannot be given a storage class specifier. 6516 int Error = -1; 6517 switch (VD->getStorageClassAsWritten()) { 6518 case SC_None: 6519 break; 6520 case SC_Extern: 6521 Error = 0; 6522 break; 6523 case SC_Static: 6524 Error = 1; 6525 break; 6526 case SC_PrivateExtern: 6527 Error = 2; 6528 break; 6529 case SC_Auto: 6530 Error = 3; 6531 break; 6532 case SC_Register: 6533 Error = 4; 6534 break; 6535 case SC_OpenCLWorkGroupLocal: 6536 llvm_unreachable("Unexpected storage class"); 6537 } 6538 if (VD->isConstexpr()) 6539 Error = 5; 6540 if (Error != -1) { 6541 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6542 << VD->getDeclName() << Error; 6543 D->setInvalidDecl(); 6544 } 6545} 6546 6547void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6548 if (var->isInvalidDecl()) return; 6549 6550 // In ARC, don't allow jumps past the implicit initialization of a 6551 // local retaining variable. 6552 if (getLangOptions().ObjCAutoRefCount && 6553 var->hasLocalStorage()) { 6554 switch (var->getType().getObjCLifetime()) { 6555 case Qualifiers::OCL_None: 6556 case Qualifiers::OCL_ExplicitNone: 6557 case Qualifiers::OCL_Autoreleasing: 6558 break; 6559 6560 case Qualifiers::OCL_Weak: 6561 case Qualifiers::OCL_Strong: 6562 getCurFunction()->setHasBranchProtectedScope(); 6563 break; 6564 } 6565 } 6566 6567 // All the following checks are C++ only. 6568 if (!getLangOptions().CPlusPlus) return; 6569 6570 QualType baseType = Context.getBaseElementType(var->getType()); 6571 if (baseType->isDependentType()) return; 6572 6573 // __block variables might require us to capture a copy-initializer. 6574 if (var->hasAttr<BlocksAttr>()) { 6575 // It's currently invalid to ever have a __block variable with an 6576 // array type; should we diagnose that here? 6577 6578 // Regardless, we don't want to ignore array nesting when 6579 // constructing this copy. 6580 QualType type = var->getType(); 6581 6582 if (type->isStructureOrClassType()) { 6583 SourceLocation poi = var->getLocation(); 6584 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6585 ExprResult result = 6586 PerformCopyInitialization( 6587 InitializedEntity::InitializeBlock(poi, type, false), 6588 poi, Owned(varRef)); 6589 if (!result.isInvalid()) { 6590 result = MaybeCreateExprWithCleanups(result); 6591 Expr *init = result.takeAs<Expr>(); 6592 Context.setBlockVarCopyInits(var, init); 6593 } 6594 } 6595 } 6596 6597 Expr *Init = var->getInit(); 6598 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6599 6600 if (!var->getDeclContext()->isDependentContext() && Init) { 6601 if (IsGlobal && !var->isConstexpr() && 6602 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6603 var->getLocation()) 6604 != DiagnosticsEngine::Ignored && 6605 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 6606 Diag(var->getLocation(), diag::warn_global_constructor) 6607 << Init->getSourceRange(); 6608 6609 if (var->isConstexpr()) { 6610 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 6611 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 6612 SourceLocation DiagLoc = var->getLocation(); 6613 // If the note doesn't add any useful information other than a source 6614 // location, fold it into the primary diagnostic. 6615 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 6616 diag::note_invalid_subexpr_in_const_expr) { 6617 DiagLoc = Notes[0].first; 6618 Notes.clear(); 6619 } 6620 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 6621 << var << Init->getSourceRange(); 6622 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 6623 Diag(Notes[I].first, Notes[I].second); 6624 } 6625 } else if (var->isUsableInConstantExpressions()) { 6626 // Check whether the initializer of a const variable of integral or 6627 // enumeration type is an ICE now, since we can't tell whether it was 6628 // initialized by a constant expression if we check later. 6629 var->checkInitIsICE(); 6630 } 6631 } 6632 6633 // Require the destructor. 6634 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6635 FinalizeVarWithDestructor(var, recordType); 6636} 6637 6638/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6639/// any semantic actions necessary after any initializer has been attached. 6640void 6641Sema::FinalizeDeclaration(Decl *ThisDecl) { 6642 // Note that we are no longer parsing the initializer for this declaration. 6643 ParsingInitForAutoVars.erase(ThisDecl); 6644} 6645 6646Sema::DeclGroupPtrTy 6647Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6648 Decl **Group, unsigned NumDecls) { 6649 SmallVector<Decl*, 8> Decls; 6650 6651 if (DS.isTypeSpecOwned()) 6652 Decls.push_back(DS.getRepAsDecl()); 6653 6654 for (unsigned i = 0; i != NumDecls; ++i) 6655 if (Decl *D = Group[i]) 6656 Decls.push_back(D); 6657 6658 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6659 DS.getTypeSpecType() == DeclSpec::TST_auto); 6660} 6661 6662/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6663/// group, performing any necessary semantic checking. 6664Sema::DeclGroupPtrTy 6665Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6666 bool TypeMayContainAuto) { 6667 // C++0x [dcl.spec.auto]p7: 6668 // If the type deduced for the template parameter U is not the same in each 6669 // deduction, the program is ill-formed. 6670 // FIXME: When initializer-list support is added, a distinction is needed 6671 // between the deduced type U and the deduced type which 'auto' stands for. 6672 // auto a = 0, b = { 1, 2, 3 }; 6673 // is legal because the deduced type U is 'int' in both cases. 6674 if (TypeMayContainAuto && NumDecls > 1) { 6675 QualType Deduced; 6676 CanQualType DeducedCanon; 6677 VarDecl *DeducedDecl = 0; 6678 for (unsigned i = 0; i != NumDecls; ++i) { 6679 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6680 AutoType *AT = D->getType()->getContainedAutoType(); 6681 // Don't reissue diagnostics when instantiating a template. 6682 if (AT && D->isInvalidDecl()) 6683 break; 6684 if (AT && AT->isDeduced()) { 6685 QualType U = AT->getDeducedType(); 6686 CanQualType UCanon = Context.getCanonicalType(U); 6687 if (Deduced.isNull()) { 6688 Deduced = U; 6689 DeducedCanon = UCanon; 6690 DeducedDecl = D; 6691 } else if (DeducedCanon != UCanon) { 6692 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6693 diag::err_auto_different_deductions) 6694 << Deduced << DeducedDecl->getDeclName() 6695 << U << D->getDeclName() 6696 << DeducedDecl->getInit()->getSourceRange() 6697 << D->getInit()->getSourceRange(); 6698 D->setInvalidDecl(); 6699 break; 6700 } 6701 } 6702 } 6703 } 6704 } 6705 6706 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6707} 6708 6709 6710/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6711/// to introduce parameters into function prototype scope. 6712Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6713 const DeclSpec &DS = D.getDeclSpec(); 6714 6715 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6716 // C++03 [dcl.stc]p2 also permits 'auto'. 6717 VarDecl::StorageClass StorageClass = SC_None; 6718 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6719 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6720 StorageClass = SC_Register; 6721 StorageClassAsWritten = SC_Register; 6722 } else if (getLangOptions().CPlusPlus && 6723 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6724 StorageClass = SC_Auto; 6725 StorageClassAsWritten = SC_Auto; 6726 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6727 Diag(DS.getStorageClassSpecLoc(), 6728 diag::err_invalid_storage_class_in_func_decl); 6729 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6730 } 6731 6732 if (D.getDeclSpec().isThreadSpecified()) 6733 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6734 if (D.getDeclSpec().isConstexprSpecified()) 6735 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6736 << 0; 6737 6738 DiagnoseFunctionSpecifiers(D); 6739 6740 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6741 QualType parmDeclType = TInfo->getType(); 6742 6743 if (getLangOptions().CPlusPlus) { 6744 // Check that there are no default arguments inside the type of this 6745 // parameter. 6746 CheckExtraCXXDefaultArguments(D); 6747 6748 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6749 if (D.getCXXScopeSpec().isSet()) { 6750 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6751 << D.getCXXScopeSpec().getRange(); 6752 D.getCXXScopeSpec().clear(); 6753 } 6754 } 6755 6756 // Ensure we have a valid name 6757 IdentifierInfo *II = 0; 6758 if (D.hasName()) { 6759 II = D.getIdentifier(); 6760 if (!II) { 6761 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6762 << GetNameForDeclarator(D).getName().getAsString(); 6763 D.setInvalidType(true); 6764 } 6765 } 6766 6767 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6768 if (II) { 6769 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6770 ForRedeclaration); 6771 LookupName(R, S); 6772 if (R.isSingleResult()) { 6773 NamedDecl *PrevDecl = R.getFoundDecl(); 6774 if (PrevDecl->isTemplateParameter()) { 6775 // Maybe we will complain about the shadowed template parameter. 6776 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6777 // Just pretend that we didn't see the previous declaration. 6778 PrevDecl = 0; 6779 } else if (S->isDeclScope(PrevDecl)) { 6780 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6781 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6782 6783 // Recover by removing the name 6784 II = 0; 6785 D.SetIdentifier(0, D.getIdentifierLoc()); 6786 D.setInvalidType(true); 6787 } 6788 } 6789 } 6790 6791 // Temporarily put parameter variables in the translation unit, not 6792 // the enclosing context. This prevents them from accidentally 6793 // looking like class members in C++. 6794 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6795 D.getSourceRange().getBegin(), 6796 D.getIdentifierLoc(), II, 6797 parmDeclType, TInfo, 6798 StorageClass, StorageClassAsWritten); 6799 6800 if (D.isInvalidType()) 6801 New->setInvalidDecl(); 6802 6803 assert(S->isFunctionPrototypeScope()); 6804 assert(S->getFunctionPrototypeDepth() >= 1); 6805 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6806 S->getNextFunctionPrototypeIndex()); 6807 6808 // Add the parameter declaration into this scope. 6809 S->AddDecl(New); 6810 if (II) 6811 IdResolver.AddDecl(New); 6812 6813 ProcessDeclAttributes(S, New, D); 6814 6815 if (D.getDeclSpec().isModulePrivateSpecified()) 6816 Diag(New->getLocation(), diag::err_module_private_local) 6817 << 1 << New->getDeclName() 6818 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6819 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6820 6821 if (New->hasAttr<BlocksAttr>()) { 6822 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6823 } 6824 return New; 6825} 6826 6827/// \brief Synthesizes a variable for a parameter arising from a 6828/// typedef. 6829ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6830 SourceLocation Loc, 6831 QualType T) { 6832 /* FIXME: setting StartLoc == Loc. 6833 Would it be worth to modify callers so as to provide proper source 6834 location for the unnamed parameters, embedding the parameter's type? */ 6835 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6836 T, Context.getTrivialTypeSourceInfo(T, Loc), 6837 SC_None, SC_None, 0); 6838 Param->setImplicit(); 6839 return Param; 6840} 6841 6842void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6843 ParmVarDecl * const *ParamEnd) { 6844 // Don't diagnose unused-parameter errors in template instantiations; we 6845 // will already have done so in the template itself. 6846 if (!ActiveTemplateInstantiations.empty()) 6847 return; 6848 6849 for (; Param != ParamEnd; ++Param) { 6850 if (!(*Param)->isReferenced() && (*Param)->getDeclName() && 6851 !(*Param)->hasAttr<UnusedAttr>()) { 6852 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6853 << (*Param)->getDeclName(); 6854 } 6855 } 6856} 6857 6858void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6859 ParmVarDecl * const *ParamEnd, 6860 QualType ReturnTy, 6861 NamedDecl *D) { 6862 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6863 return; 6864 6865 // Warn if the return value is pass-by-value and larger than the specified 6866 // threshold. 6867 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 6868 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6869 if (Size > LangOpts.NumLargeByValueCopy) 6870 Diag(D->getLocation(), diag::warn_return_value_size) 6871 << D->getDeclName() << Size; 6872 } 6873 6874 // Warn if any parameter is pass-by-value and larger than the specified 6875 // threshold. 6876 for (; Param != ParamEnd; ++Param) { 6877 QualType T = (*Param)->getType(); 6878 if (T->isDependentType() || !T.isPODType(Context)) 6879 continue; 6880 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6881 if (Size > LangOpts.NumLargeByValueCopy) 6882 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6883 << (*Param)->getDeclName() << Size; 6884 } 6885} 6886 6887ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6888 SourceLocation NameLoc, IdentifierInfo *Name, 6889 QualType T, TypeSourceInfo *TSInfo, 6890 VarDecl::StorageClass StorageClass, 6891 VarDecl::StorageClass StorageClassAsWritten) { 6892 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6893 if (getLangOptions().ObjCAutoRefCount && 6894 T.getObjCLifetime() == Qualifiers::OCL_None && 6895 T->isObjCLifetimeType()) { 6896 6897 Qualifiers::ObjCLifetime lifetime; 6898 6899 // Special cases for arrays: 6900 // - if it's const, use __unsafe_unretained 6901 // - otherwise, it's an error 6902 if (T->isArrayType()) { 6903 if (!T.isConstQualified()) { 6904 DelayedDiagnostics.add( 6905 sema::DelayedDiagnostic::makeForbiddenType( 6906 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6907 } 6908 lifetime = Qualifiers::OCL_ExplicitNone; 6909 } else { 6910 lifetime = T->getObjCARCImplicitLifetime(); 6911 } 6912 T = Context.getLifetimeQualifiedType(T, lifetime); 6913 } 6914 6915 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6916 Context.getAdjustedParameterType(T), 6917 TSInfo, 6918 StorageClass, StorageClassAsWritten, 6919 0); 6920 6921 // Parameters can not be abstract class types. 6922 // For record types, this is done by the AbstractClassUsageDiagnoser once 6923 // the class has been completely parsed. 6924 if (!CurContext->isRecord() && 6925 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6926 AbstractParamType)) 6927 New->setInvalidDecl(); 6928 6929 // Parameter declarators cannot be interface types. All ObjC objects are 6930 // passed by reference. 6931 if (T->isObjCObjectType()) { 6932 Diag(NameLoc, 6933 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6934 << FixItHint::CreateInsertion(NameLoc, "*"); 6935 T = Context.getObjCObjectPointerType(T); 6936 New->setType(T); 6937 } 6938 6939 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6940 // duration shall not be qualified by an address-space qualifier." 6941 // Since all parameters have automatic store duration, they can not have 6942 // an address space. 6943 if (T.getAddressSpace() != 0) { 6944 Diag(NameLoc, diag::err_arg_with_address_space); 6945 New->setInvalidDecl(); 6946 } 6947 6948 return New; 6949} 6950 6951void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6952 SourceLocation LocAfterDecls) { 6953 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6954 6955 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6956 // for a K&R function. 6957 if (!FTI.hasPrototype) { 6958 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6959 --i; 6960 if (FTI.ArgInfo[i].Param == 0) { 6961 llvm::SmallString<256> Code; 6962 llvm::raw_svector_ostream(Code) << " int " 6963 << FTI.ArgInfo[i].Ident->getName() 6964 << ";\n"; 6965 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6966 << FTI.ArgInfo[i].Ident 6967 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6968 6969 // Implicitly declare the argument as type 'int' for lack of a better 6970 // type. 6971 AttributeFactory attrs; 6972 DeclSpec DS(attrs); 6973 const char* PrevSpec; // unused 6974 unsigned DiagID; // unused 6975 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6976 PrevSpec, DiagID); 6977 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6978 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6979 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6980 } 6981 } 6982 } 6983} 6984 6985Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6986 Declarator &D) { 6987 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6988 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6989 Scope *ParentScope = FnBodyScope->getParent(); 6990 6991 D.setFunctionDefinitionKind(FDK_Definition); 6992 Decl *DP = HandleDeclarator(ParentScope, D, 6993 MultiTemplateParamsArg(*this)); 6994 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6995} 6996 6997static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6998 // Don't warn about invalid declarations. 6999 if (FD->isInvalidDecl()) 7000 return false; 7001 7002 // Or declarations that aren't global. 7003 if (!FD->isGlobal()) 7004 return false; 7005 7006 // Don't warn about C++ member functions. 7007 if (isa<CXXMethodDecl>(FD)) 7008 return false; 7009 7010 // Don't warn about 'main'. 7011 if (FD->isMain()) 7012 return false; 7013 7014 // Don't warn about inline functions. 7015 if (FD->isInlined()) 7016 return false; 7017 7018 // Don't warn about function templates. 7019 if (FD->getDescribedFunctionTemplate()) 7020 return false; 7021 7022 // Don't warn about function template specializations. 7023 if (FD->isFunctionTemplateSpecialization()) 7024 return false; 7025 7026 bool MissingPrototype = true; 7027 for (const FunctionDecl *Prev = FD->getPreviousDecl(); 7028 Prev; Prev = Prev->getPreviousDecl()) { 7029 // Ignore any declarations that occur in function or method 7030 // scope, because they aren't visible from the header. 7031 if (Prev->getDeclContext()->isFunctionOrMethod()) 7032 continue; 7033 7034 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 7035 break; 7036 } 7037 7038 return MissingPrototype; 7039} 7040 7041void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 7042 // Don't complain if we're in GNU89 mode and the previous definition 7043 // was an extern inline function. 7044 const FunctionDecl *Definition; 7045 if (FD->isDefined(Definition) && 7046 !canRedefineFunction(Definition, getLangOptions())) { 7047 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 7048 Definition->getStorageClass() == SC_Extern) 7049 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 7050 << FD->getDeclName() << getLangOptions().CPlusPlus; 7051 else 7052 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 7053 Diag(Definition->getLocation(), diag::note_previous_definition); 7054 } 7055} 7056 7057Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 7058 // Clear the last template instantiation error context. 7059 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 7060 7061 if (!D) 7062 return D; 7063 FunctionDecl *FD = 0; 7064 7065 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 7066 FD = FunTmpl->getTemplatedDecl(); 7067 else 7068 FD = cast<FunctionDecl>(D); 7069 7070 // Enter a new function scope 7071 PushFunctionScope(); 7072 7073 // See if this is a redefinition. 7074 if (!FD->isLateTemplateParsed()) 7075 CheckForFunctionRedefinition(FD); 7076 7077 // Builtin functions cannot be defined. 7078 if (unsigned BuiltinID = FD->getBuiltinID()) { 7079 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7080 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7081 FD->setInvalidDecl(); 7082 } 7083 } 7084 7085 // The return type of a function definition must be complete 7086 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7087 QualType ResultType = FD->getResultType(); 7088 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7089 !FD->isInvalidDecl() && 7090 RequireCompleteType(FD->getLocation(), ResultType, 7091 diag::err_func_def_incomplete_result)) 7092 FD->setInvalidDecl(); 7093 7094 // GNU warning -Wmissing-prototypes: 7095 // Warn if a global function is defined without a previous 7096 // prototype declaration. This warning is issued even if the 7097 // definition itself provides a prototype. The aim is to detect 7098 // global functions that fail to be declared in header files. 7099 if (ShouldWarnAboutMissingPrototype(FD)) 7100 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7101 7102 if (FnBodyScope) 7103 PushDeclContext(FnBodyScope, FD); 7104 7105 // Check the validity of our function parameters 7106 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7107 /*CheckParameterNames=*/true); 7108 7109 // Introduce our parameters into the function scope 7110 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7111 ParmVarDecl *Param = FD->getParamDecl(p); 7112 Param->setOwningFunction(FD); 7113 7114 // If this has an identifier, add it to the scope stack. 7115 if (Param->getIdentifier() && FnBodyScope) { 7116 CheckShadow(FnBodyScope, Param); 7117 7118 PushOnScopeChains(Param, FnBodyScope); 7119 } 7120 } 7121 7122 // Checking attributes of current function definition 7123 // dllimport attribute. 7124 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7125 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7126 // dllimport attribute cannot be directly applied to definition. 7127 // Microsoft accepts dllimport for functions defined within class scope. 7128 if (!DA->isInherited() && 7129 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7130 Diag(FD->getLocation(), 7131 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7132 << "dllimport"; 7133 FD->setInvalidDecl(); 7134 return FD; 7135 } 7136 7137 // Visual C++ appears to not think this is an issue, so only issue 7138 // a warning when Microsoft extensions are disabled. 7139 if (!LangOpts.MicrosoftExt) { 7140 // If a symbol previously declared dllimport is later defined, the 7141 // attribute is ignored in subsequent references, and a warning is 7142 // emitted. 7143 Diag(FD->getLocation(), 7144 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7145 << FD->getName() << "dllimport"; 7146 } 7147 } 7148 return FD; 7149} 7150 7151/// \brief Given the set of return statements within a function body, 7152/// compute the variables that are subject to the named return value 7153/// optimization. 7154/// 7155/// Each of the variables that is subject to the named return value 7156/// optimization will be marked as NRVO variables in the AST, and any 7157/// return statement that has a marked NRVO variable as its NRVO candidate can 7158/// use the named return value optimization. 7159/// 7160/// This function applies a very simplistic algorithm for NRVO: if every return 7161/// statement in the function has the same NRVO candidate, that candidate is 7162/// the NRVO variable. 7163/// 7164/// FIXME: Employ a smarter algorithm that accounts for multiple return 7165/// statements and the lifetimes of the NRVO candidates. We should be able to 7166/// find a maximal set of NRVO variables. 7167void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7168 ReturnStmt **Returns = Scope->Returns.data(); 7169 7170 const VarDecl *NRVOCandidate = 0; 7171 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7172 if (!Returns[I]->getNRVOCandidate()) 7173 return; 7174 7175 if (!NRVOCandidate) 7176 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7177 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7178 return; 7179 } 7180 7181 if (NRVOCandidate) 7182 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7183} 7184 7185Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7186 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7187} 7188 7189Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7190 bool IsInstantiation) { 7191 FunctionDecl *FD = 0; 7192 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7193 if (FunTmpl) 7194 FD = FunTmpl->getTemplatedDecl(); 7195 else 7196 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7197 7198 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7199 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7200 7201 if (FD) { 7202 FD->setBody(Body); 7203 if (FD->isMain()) { 7204 // C and C++ allow for main to automagically return 0. 7205 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7206 FD->setHasImplicitReturnZero(true); 7207 WP.disableCheckFallThrough(); 7208 } else if (FD->hasAttr<NakedAttr>()) { 7209 // If the function is marked 'naked', don't complain about missing return 7210 // statements. 7211 WP.disableCheckFallThrough(); 7212 } 7213 7214 // MSVC permits the use of pure specifier (=0) on function definition, 7215 // defined at class scope, warn about this non standard construct. 7216 if (getLangOptions().MicrosoftExt && FD->isPure()) 7217 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7218 7219 if (!FD->isInvalidDecl()) { 7220 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7221 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7222 FD->getResultType(), FD); 7223 7224 // If this is a constructor, we need a vtable. 7225 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7226 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7227 7228 computeNRVO(Body, getCurFunction()); 7229 } 7230 7231 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7232 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7233 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7234 MD->setBody(Body); 7235 if (Body) 7236 MD->setEndLoc(Body->getLocEnd()); 7237 if (!MD->isInvalidDecl()) { 7238 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7239 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7240 MD->getResultType(), MD); 7241 7242 if (Body) 7243 computeNRVO(Body, getCurFunction()); 7244 } 7245 if (ObjCShouldCallSuperDealloc) { 7246 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7247 ObjCShouldCallSuperDealloc = false; 7248 } 7249 if (ObjCShouldCallSuperFinalize) { 7250 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7251 ObjCShouldCallSuperFinalize = false; 7252 } 7253 } else { 7254 return 0; 7255 } 7256 7257 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7258 "ObjC methods, which should have been handled in the block above."); 7259 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7260 "ObjC methods, which should have been handled in the block above."); 7261 7262 // Verify and clean out per-function state. 7263 if (Body) { 7264 // C++ constructors that have function-try-blocks can't have return 7265 // statements in the handlers of that block. (C++ [except.handle]p14) 7266 // Verify this. 7267 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7268 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7269 7270 // Verify that gotos and switch cases don't jump into scopes illegally. 7271 if (getCurFunction()->NeedsScopeChecking() && 7272 !dcl->isInvalidDecl() && 7273 !hasAnyUnrecoverableErrorsInThisFunction()) 7274 DiagnoseInvalidJumps(Body); 7275 7276 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7277 if (!Destructor->getParent()->isDependentType()) 7278 CheckDestructor(Destructor); 7279 7280 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7281 Destructor->getParent()); 7282 } 7283 7284 // If any errors have occurred, clear out any temporaries that may have 7285 // been leftover. This ensures that these temporaries won't be picked up for 7286 // deletion in some later function. 7287 if (PP.getDiagnostics().hasErrorOccurred() || 7288 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7289 DiscardCleanupsInEvaluationContext(); 7290 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7291 // Since the body is valid, issue any analysis-based warnings that are 7292 // enabled. 7293 ActivePolicy = &WP; 7294 } 7295 7296 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7297 !CheckConstexprFunctionBody(FD, Body)) 7298 FD->setInvalidDecl(); 7299 7300 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7301 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7302 } 7303 7304 if (!IsInstantiation) 7305 PopDeclContext(); 7306 7307 PopFunctionScopeInfo(ActivePolicy, dcl); 7308 7309 // If any errors have occurred, clear out any temporaries that may have 7310 // been leftover. This ensures that these temporaries won't be picked up for 7311 // deletion in some later function. 7312 if (getDiagnostics().hasErrorOccurred()) { 7313 DiscardCleanupsInEvaluationContext(); 7314 } 7315 7316 return dcl; 7317} 7318 7319 7320/// When we finish delayed parsing of an attribute, we must attach it to the 7321/// relevant Decl. 7322void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7323 ParsedAttributes &Attrs) { 7324 // Always attach attributes to the underlying decl. 7325 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) 7326 D = TD->getTemplatedDecl(); 7327 ProcessDeclAttributeList(S, D, Attrs.getList()); 7328} 7329 7330 7331/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7332/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7333NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7334 IdentifierInfo &II, Scope *S) { 7335 // Before we produce a declaration for an implicitly defined 7336 // function, see whether there was a locally-scoped declaration of 7337 // this name as a function or variable. If so, use that 7338 // (non-visible) declaration, and complain about it. 7339 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7340 = findLocallyScopedExternalDecl(&II); 7341 if (Pos != LocallyScopedExternalDecls.end()) { 7342 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7343 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7344 return Pos->second; 7345 } 7346 7347 // Extension in C99. Legal in C90, but warn about it. 7348 unsigned diag_id; 7349 if (II.getName().startswith("__builtin_")) 7350 diag_id = diag::warn_builtin_unknown; 7351 else if (getLangOptions().C99) 7352 diag_id = diag::ext_implicit_function_decl; 7353 else 7354 diag_id = diag::warn_implicit_function_decl; 7355 Diag(Loc, diag_id) << &II; 7356 7357 // Because typo correction is expensive, only do it if the implicit 7358 // function declaration is going to be treated as an error. 7359 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7360 TypoCorrection Corrected; 7361 DeclFilterCCC<FunctionDecl> Validator; 7362 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7363 LookupOrdinaryName, S, 0, Validator))) { 7364 std::string CorrectedStr = Corrected.getAsString(getLangOptions()); 7365 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOptions()); 7366 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>(); 7367 7368 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7369 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7370 7371 if (Func->getLocation().isValid() 7372 && !II.getName().startswith("__builtin_")) 7373 Diag(Func->getLocation(), diag::note_previous_decl) 7374 << CorrectedQuotedStr; 7375 } 7376 } 7377 7378 // Set a Declarator for the implicit definition: int foo(); 7379 const char *Dummy; 7380 AttributeFactory attrFactory; 7381 DeclSpec DS(attrFactory); 7382 unsigned DiagID; 7383 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7384 (void)Error; // Silence warning. 7385 assert(!Error && "Error setting up implicit decl!"); 7386 Declarator D(DS, Declarator::BlockContext); 7387 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7388 0, 0, true, SourceLocation(), 7389 SourceLocation(), SourceLocation(), 7390 SourceLocation(), 7391 EST_None, SourceLocation(), 7392 0, 0, 0, 0, Loc, Loc, D), 7393 DS.getAttributes(), 7394 SourceLocation()); 7395 D.SetIdentifier(&II, Loc); 7396 7397 // Insert this function into translation-unit scope. 7398 7399 DeclContext *PrevDC = CurContext; 7400 CurContext = Context.getTranslationUnitDecl(); 7401 7402 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7403 FD->setImplicit(); 7404 7405 CurContext = PrevDC; 7406 7407 AddKnownFunctionAttributes(FD); 7408 7409 return FD; 7410} 7411 7412/// \brief Adds any function attributes that we know a priori based on 7413/// the declaration of this function. 7414/// 7415/// These attributes can apply both to implicitly-declared builtins 7416/// (like __builtin___printf_chk) or to library-declared functions 7417/// like NSLog or printf. 7418/// 7419/// We need to check for duplicate attributes both here and where user-written 7420/// attributes are applied to declarations. 7421void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7422 if (FD->isInvalidDecl()) 7423 return; 7424 7425 // If this is a built-in function, map its builtin attributes to 7426 // actual attributes. 7427 if (unsigned BuiltinID = FD->getBuiltinID()) { 7428 // Handle printf-formatting attributes. 7429 unsigned FormatIdx; 7430 bool HasVAListArg; 7431 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7432 if (!FD->getAttr<FormatAttr>()) { 7433 const char *fmt = "printf"; 7434 unsigned int NumParams = FD->getNumParams(); 7435 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf) 7436 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType()) 7437 fmt = "NSString"; 7438 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7439 fmt, FormatIdx+1, 7440 HasVAListArg ? 0 : FormatIdx+2)); 7441 } 7442 } 7443 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7444 HasVAListArg)) { 7445 if (!FD->getAttr<FormatAttr>()) 7446 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7447 "scanf", FormatIdx+1, 7448 HasVAListArg ? 0 : FormatIdx+2)); 7449 } 7450 7451 // Mark const if we don't care about errno and that is the only 7452 // thing preventing the function from being const. This allows 7453 // IRgen to use LLVM intrinsics for such functions. 7454 if (!getLangOptions().MathErrno && 7455 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7456 if (!FD->getAttr<ConstAttr>()) 7457 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7458 } 7459 7460 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7461 !FD->getAttr<ReturnsTwiceAttr>()) 7462 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7463 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7464 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7465 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7466 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7467 } 7468 7469 IdentifierInfo *Name = FD->getIdentifier(); 7470 if (!Name) 7471 return; 7472 if ((!getLangOptions().CPlusPlus && 7473 FD->getDeclContext()->isTranslationUnit()) || 7474 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7475 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7476 LinkageSpecDecl::lang_c)) { 7477 // Okay: this could be a libc/libm/Objective-C function we know 7478 // about. 7479 } else 7480 return; 7481 7482 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7483 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7484 // target-specific builtins, perhaps? 7485 if (!FD->getAttr<FormatAttr>()) 7486 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7487 "printf", 2, 7488 Name->isStr("vasprintf") ? 0 : 3)); 7489 } 7490} 7491 7492TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7493 TypeSourceInfo *TInfo) { 7494 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7495 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7496 7497 if (!TInfo) { 7498 assert(D.isInvalidType() && "no declarator info for valid type"); 7499 TInfo = Context.getTrivialTypeSourceInfo(T); 7500 } 7501 7502 // Scope manipulation handled by caller. 7503 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7504 D.getSourceRange().getBegin(), 7505 D.getIdentifierLoc(), 7506 D.getIdentifier(), 7507 TInfo); 7508 7509 // Bail out immediately if we have an invalid declaration. 7510 if (D.isInvalidType()) { 7511 NewTD->setInvalidDecl(); 7512 return NewTD; 7513 } 7514 7515 if (D.getDeclSpec().isModulePrivateSpecified()) { 7516 if (CurContext->isFunctionOrMethod()) 7517 Diag(NewTD->getLocation(), diag::err_module_private_local) 7518 << 2 << NewTD->getDeclName() 7519 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7520 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7521 else 7522 NewTD->setModulePrivate(); 7523 } 7524 7525 // C++ [dcl.typedef]p8: 7526 // If the typedef declaration defines an unnamed class (or 7527 // enum), the first typedef-name declared by the declaration 7528 // to be that class type (or enum type) is used to denote the 7529 // class type (or enum type) for linkage purposes only. 7530 // We need to check whether the type was declared in the declaration. 7531 switch (D.getDeclSpec().getTypeSpecType()) { 7532 case TST_enum: 7533 case TST_struct: 7534 case TST_union: 7535 case TST_class: { 7536 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7537 7538 // Do nothing if the tag is not anonymous or already has an 7539 // associated typedef (from an earlier typedef in this decl group). 7540 if (tagFromDeclSpec->getIdentifier()) break; 7541 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7542 7543 // A well-formed anonymous tag must always be a TUK_Definition. 7544 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7545 7546 // The type must match the tag exactly; no qualifiers allowed. 7547 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7548 break; 7549 7550 // Otherwise, set this is the anon-decl typedef for the tag. 7551 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7552 break; 7553 } 7554 7555 default: 7556 break; 7557 } 7558 7559 return NewTD; 7560} 7561 7562 7563/// \brief Determine whether a tag with a given kind is acceptable 7564/// as a redeclaration of the given tag declaration. 7565/// 7566/// \returns true if the new tag kind is acceptable, false otherwise. 7567bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7568 TagTypeKind NewTag, bool isDefinition, 7569 SourceLocation NewTagLoc, 7570 const IdentifierInfo &Name) { 7571 // C++ [dcl.type.elab]p3: 7572 // The class-key or enum keyword present in the 7573 // elaborated-type-specifier shall agree in kind with the 7574 // declaration to which the name in the elaborated-type-specifier 7575 // refers. This rule also applies to the form of 7576 // elaborated-type-specifier that declares a class-name or 7577 // friend class since it can be construed as referring to the 7578 // definition of the class. Thus, in any 7579 // elaborated-type-specifier, the enum keyword shall be used to 7580 // refer to an enumeration (7.2), the union class-key shall be 7581 // used to refer to a union (clause 9), and either the class or 7582 // struct class-key shall be used to refer to a class (clause 9) 7583 // declared using the class or struct class-key. 7584 TagTypeKind OldTag = Previous->getTagKind(); 7585 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7586 if (OldTag == NewTag) 7587 return true; 7588 7589 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7590 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7591 // Warn about the struct/class tag mismatch. 7592 bool isTemplate = false; 7593 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7594 isTemplate = Record->getDescribedClassTemplate(); 7595 7596 if (!ActiveTemplateInstantiations.empty()) { 7597 // In a template instantiation, do not offer fix-its for tag mismatches 7598 // since they usually mess up the template instead of fixing the problem. 7599 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7600 << (NewTag == TTK_Class) << isTemplate << &Name; 7601 return true; 7602 } 7603 7604 if (isDefinition) { 7605 // On definitions, check previous tags and issue a fix-it for each 7606 // one that doesn't match the current tag. 7607 if (Previous->getDefinition()) { 7608 // Don't suggest fix-its for redefinitions. 7609 return true; 7610 } 7611 7612 bool previousMismatch = false; 7613 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7614 E(Previous->redecls_end()); I != E; ++I) { 7615 if (I->getTagKind() != NewTag) { 7616 if (!previousMismatch) { 7617 previousMismatch = true; 7618 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7619 << (NewTag == TTK_Class) << isTemplate << &Name; 7620 } 7621 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7622 << (NewTag == TTK_Class) 7623 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7624 NewTag == TTK_Class? 7625 "class" : "struct"); 7626 } 7627 } 7628 return true; 7629 } 7630 7631 // Check for a previous definition. If current tag and definition 7632 // are same type, do nothing. If no definition, but disagree with 7633 // with previous tag type, give a warning, but no fix-it. 7634 const TagDecl *Redecl = Previous->getDefinition() ? 7635 Previous->getDefinition() : Previous; 7636 if (Redecl->getTagKind() == NewTag) { 7637 return true; 7638 } 7639 7640 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7641 << (NewTag == TTK_Class) 7642 << isTemplate << &Name; 7643 Diag(Redecl->getLocation(), diag::note_previous_use); 7644 7645 // If there is a previous defintion, suggest a fix-it. 7646 if (Previous->getDefinition()) { 7647 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7648 << (Redecl->getTagKind() == TTK_Class) 7649 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7650 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7651 } 7652 7653 return true; 7654 } 7655 return false; 7656} 7657 7658/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7659/// former case, Name will be non-null. In the later case, Name will be null. 7660/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7661/// reference/declaration/definition of a tag. 7662Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7663 SourceLocation KWLoc, CXXScopeSpec &SS, 7664 IdentifierInfo *Name, SourceLocation NameLoc, 7665 AttributeList *Attr, AccessSpecifier AS, 7666 SourceLocation ModulePrivateLoc, 7667 MultiTemplateParamsArg TemplateParameterLists, 7668 bool &OwnedDecl, bool &IsDependent, 7669 SourceLocation ScopedEnumKWLoc, 7670 bool ScopedEnumUsesClassTag, 7671 TypeResult UnderlyingType) { 7672 // If this is not a definition, it must have a name. 7673 assert((Name != 0 || TUK == TUK_Definition) && 7674 "Nameless record must be a definition!"); 7675 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7676 7677 OwnedDecl = false; 7678 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7679 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 7680 7681 // FIXME: Check explicit specializations more carefully. 7682 bool isExplicitSpecialization = false; 7683 bool Invalid = false; 7684 7685 // We only need to do this matching if we have template parameters 7686 // or a scope specifier, which also conveniently avoids this work 7687 // for non-C++ cases. 7688 if (TemplateParameterLists.size() > 0 || 7689 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7690 if (TemplateParameterList *TemplateParams 7691 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7692 TemplateParameterLists.get(), 7693 TemplateParameterLists.size(), 7694 TUK == TUK_Friend, 7695 isExplicitSpecialization, 7696 Invalid)) { 7697 if (TemplateParams->size() > 0) { 7698 // This is a declaration or definition of a class template (which may 7699 // be a member of another template). 7700 7701 if (Invalid) 7702 return 0; 7703 7704 OwnedDecl = false; 7705 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7706 SS, Name, NameLoc, Attr, 7707 TemplateParams, AS, 7708 ModulePrivateLoc, 7709 TemplateParameterLists.size() - 1, 7710 (TemplateParameterList**) TemplateParameterLists.release()); 7711 return Result.get(); 7712 } else { 7713 // The "template<>" header is extraneous. 7714 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7715 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7716 isExplicitSpecialization = true; 7717 } 7718 } 7719 } 7720 7721 // Figure out the underlying type if this a enum declaration. We need to do 7722 // this early, because it's needed to detect if this is an incompatible 7723 // redeclaration. 7724 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7725 7726 if (Kind == TTK_Enum) { 7727 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7728 // No underlying type explicitly specified, or we failed to parse the 7729 // type, default to int. 7730 EnumUnderlying = Context.IntTy.getTypePtr(); 7731 else if (UnderlyingType.get()) { 7732 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7733 // integral type; any cv-qualification is ignored. 7734 TypeSourceInfo *TI = 0; 7735 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7736 EnumUnderlying = TI; 7737 7738 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7739 7740 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7741 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7742 << T; 7743 // Recover by falling back to int. 7744 EnumUnderlying = Context.IntTy.getTypePtr(); 7745 } 7746 7747 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7748 UPPC_FixedUnderlyingType)) 7749 EnumUnderlying = Context.IntTy.getTypePtr(); 7750 7751 } else if (getLangOptions().MicrosoftExt) 7752 // Microsoft enums are always of int type. 7753 EnumUnderlying = Context.IntTy.getTypePtr(); 7754 } 7755 7756 DeclContext *SearchDC = CurContext; 7757 DeclContext *DC = CurContext; 7758 bool isStdBadAlloc = false; 7759 7760 RedeclarationKind Redecl = ForRedeclaration; 7761 if (TUK == TUK_Friend || TUK == TUK_Reference) 7762 Redecl = NotForRedeclaration; 7763 7764 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7765 7766 if (Name && SS.isNotEmpty()) { 7767 // We have a nested-name tag ('struct foo::bar'). 7768 7769 // Check for invalid 'foo::'. 7770 if (SS.isInvalid()) { 7771 Name = 0; 7772 goto CreateNewDecl; 7773 } 7774 7775 // If this is a friend or a reference to a class in a dependent 7776 // context, don't try to make a decl for it. 7777 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7778 DC = computeDeclContext(SS, false); 7779 if (!DC) { 7780 IsDependent = true; 7781 return 0; 7782 } 7783 } else { 7784 DC = computeDeclContext(SS, true); 7785 if (!DC) { 7786 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7787 << SS.getRange(); 7788 return 0; 7789 } 7790 } 7791 7792 if (RequireCompleteDeclContext(SS, DC)) 7793 return 0; 7794 7795 SearchDC = DC; 7796 // Look-up name inside 'foo::'. 7797 LookupQualifiedName(Previous, DC); 7798 7799 if (Previous.isAmbiguous()) 7800 return 0; 7801 7802 if (Previous.empty()) { 7803 // Name lookup did not find anything. However, if the 7804 // nested-name-specifier refers to the current instantiation, 7805 // and that current instantiation has any dependent base 7806 // classes, we might find something at instantiation time: treat 7807 // this as a dependent elaborated-type-specifier. 7808 // But this only makes any sense for reference-like lookups. 7809 if (Previous.wasNotFoundInCurrentInstantiation() && 7810 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7811 IsDependent = true; 7812 return 0; 7813 } 7814 7815 // A tag 'foo::bar' must already exist. 7816 Diag(NameLoc, diag::err_not_tag_in_scope) 7817 << Kind << Name << DC << SS.getRange(); 7818 Name = 0; 7819 Invalid = true; 7820 goto CreateNewDecl; 7821 } 7822 } else if (Name) { 7823 // If this is a named struct, check to see if there was a previous forward 7824 // declaration or definition. 7825 // FIXME: We're looking into outer scopes here, even when we 7826 // shouldn't be. Doing so can result in ambiguities that we 7827 // shouldn't be diagnosing. 7828 LookupName(Previous, S); 7829 7830 if (Previous.isAmbiguous() && 7831 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7832 LookupResult::Filter F = Previous.makeFilter(); 7833 while (F.hasNext()) { 7834 NamedDecl *ND = F.next(); 7835 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7836 F.erase(); 7837 } 7838 F.done(); 7839 } 7840 7841 // Note: there used to be some attempt at recovery here. 7842 if (Previous.isAmbiguous()) 7843 return 0; 7844 7845 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7846 // FIXME: This makes sure that we ignore the contexts associated 7847 // with C structs, unions, and enums when looking for a matching 7848 // tag declaration or definition. See the similar lookup tweak 7849 // in Sema::LookupName; is there a better way to deal with this? 7850 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7851 SearchDC = SearchDC->getParent(); 7852 } 7853 } else if (S->isFunctionPrototypeScope()) { 7854 // If this is an enum declaration in function prototype scope, set its 7855 // initial context to the translation unit. 7856 SearchDC = Context.getTranslationUnitDecl(); 7857 } 7858 7859 if (Previous.isSingleResult() && 7860 Previous.getFoundDecl()->isTemplateParameter()) { 7861 // Maybe we will complain about the shadowed template parameter. 7862 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7863 // Just pretend that we didn't see the previous declaration. 7864 Previous.clear(); 7865 } 7866 7867 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7868 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7869 // This is a declaration of or a reference to "std::bad_alloc". 7870 isStdBadAlloc = true; 7871 7872 if (Previous.empty() && StdBadAlloc) { 7873 // std::bad_alloc has been implicitly declared (but made invisible to 7874 // name lookup). Fill in this implicit declaration as the previous 7875 // declaration, so that the declarations get chained appropriately. 7876 Previous.addDecl(getStdBadAlloc()); 7877 } 7878 } 7879 7880 // If we didn't find a previous declaration, and this is a reference 7881 // (or friend reference), move to the correct scope. In C++, we 7882 // also need to do a redeclaration lookup there, just in case 7883 // there's a shadow friend decl. 7884 if (Name && Previous.empty() && 7885 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7886 if (Invalid) goto CreateNewDecl; 7887 assert(SS.isEmpty()); 7888 7889 if (TUK == TUK_Reference) { 7890 // C++ [basic.scope.pdecl]p5: 7891 // -- for an elaborated-type-specifier of the form 7892 // 7893 // class-key identifier 7894 // 7895 // if the elaborated-type-specifier is used in the 7896 // decl-specifier-seq or parameter-declaration-clause of a 7897 // function defined in namespace scope, the identifier is 7898 // declared as a class-name in the namespace that contains 7899 // the declaration; otherwise, except as a friend 7900 // declaration, the identifier is declared in the smallest 7901 // non-class, non-function-prototype scope that contains the 7902 // declaration. 7903 // 7904 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7905 // C structs and unions. 7906 // 7907 // It is an error in C++ to declare (rather than define) an enum 7908 // type, including via an elaborated type specifier. We'll 7909 // diagnose that later; for now, declare the enum in the same 7910 // scope as we would have picked for any other tag type. 7911 // 7912 // GNU C also supports this behavior as part of its incomplete 7913 // enum types extension, while GNU C++ does not. 7914 // 7915 // Find the context where we'll be declaring the tag. 7916 // FIXME: We would like to maintain the current DeclContext as the 7917 // lexical context, 7918 while (SearchDC->isRecord() || SearchDC->isTransparentContext() || 7919 SearchDC->isObjCContainer()) 7920 SearchDC = SearchDC->getParent(); 7921 7922 // Find the scope where we'll be declaring the tag. 7923 while (S->isClassScope() || 7924 (getLangOptions().CPlusPlus && 7925 S->isFunctionPrototypeScope()) || 7926 ((S->getFlags() & Scope::DeclScope) == 0) || 7927 (S->getEntity() && 7928 ((DeclContext *)S->getEntity())->isTransparentContext())) 7929 S = S->getParent(); 7930 } else { 7931 assert(TUK == TUK_Friend); 7932 // C++ [namespace.memdef]p3: 7933 // If a friend declaration in a non-local class first declares a 7934 // class or function, the friend class or function is a member of 7935 // the innermost enclosing namespace. 7936 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7937 } 7938 7939 // In C++, we need to do a redeclaration lookup to properly 7940 // diagnose some problems. 7941 if (getLangOptions().CPlusPlus) { 7942 Previous.setRedeclarationKind(ForRedeclaration); 7943 LookupQualifiedName(Previous, SearchDC); 7944 } 7945 } 7946 7947 if (!Previous.empty()) { 7948 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7949 7950 // It's okay to have a tag decl in the same scope as a typedef 7951 // which hides a tag decl in the same scope. Finding this 7952 // insanity with a redeclaration lookup can only actually happen 7953 // in C++. 7954 // 7955 // This is also okay for elaborated-type-specifiers, which is 7956 // technically forbidden by the current standard but which is 7957 // okay according to the likely resolution of an open issue; 7958 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7959 if (getLangOptions().CPlusPlus) { 7960 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7961 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7962 TagDecl *Tag = TT->getDecl(); 7963 if (Tag->getDeclName() == Name && 7964 Tag->getDeclContext()->getRedeclContext() 7965 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7966 PrevDecl = Tag; 7967 Previous.clear(); 7968 Previous.addDecl(Tag); 7969 Previous.resolveKind(); 7970 } 7971 } 7972 } 7973 } 7974 7975 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7976 // If this is a use of a previous tag, or if the tag is already declared 7977 // in the same scope (so that the definition/declaration completes or 7978 // rementions the tag), reuse the decl. 7979 if (TUK == TUK_Reference || TUK == TUK_Friend || 7980 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7981 // Make sure that this wasn't declared as an enum and now used as a 7982 // struct or something similar. 7983 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7984 TUK == TUK_Definition, KWLoc, 7985 *Name)) { 7986 bool SafeToContinue 7987 = (PrevTagDecl->getTagKind() != TTK_Enum && 7988 Kind != TTK_Enum); 7989 if (SafeToContinue) 7990 Diag(KWLoc, diag::err_use_with_wrong_tag) 7991 << Name 7992 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7993 PrevTagDecl->getKindName()); 7994 else 7995 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7996 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7997 7998 if (SafeToContinue) 7999 Kind = PrevTagDecl->getTagKind(); 8000 else { 8001 // Recover by making this an anonymous redefinition. 8002 Name = 0; 8003 Previous.clear(); 8004 Invalid = true; 8005 } 8006 } 8007 8008 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 8009 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 8010 8011 // If this is an elaborated-type-specifier for a scoped enumeration, 8012 // the 'class' keyword is not necessary and not permitted. 8013 if (TUK == TUK_Reference || TUK == TUK_Friend) { 8014 if (ScopedEnum) 8015 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 8016 << PrevEnum->isScoped() 8017 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 8018 return PrevTagDecl; 8019 } 8020 8021 // All conflicts with previous declarations are recovered by 8022 // returning the previous declaration. 8023 if (ScopedEnum != PrevEnum->isScoped()) { 8024 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 8025 << PrevEnum->isScoped(); 8026 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8027 return PrevTagDecl; 8028 } 8029 else if (EnumUnderlying && PrevEnum->isFixed()) { 8030 QualType T; 8031 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8032 T = TI->getType(); 8033 else 8034 T = QualType(EnumUnderlying.get<const Type*>(), 0); 8035 8036 if (!Context.hasSameUnqualifiedType(T, 8037 PrevEnum->getIntegerType())) { 8038 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 8039 diag::err_enum_redeclare_type_mismatch) 8040 << T 8041 << PrevEnum->getIntegerType(); 8042 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8043 return PrevTagDecl; 8044 } 8045 } 8046 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 8047 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 8048 << PrevEnum->isFixed(); 8049 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8050 return PrevTagDecl; 8051 } 8052 } 8053 8054 if (!Invalid) { 8055 // If this is a use, just return the declaration we found. 8056 8057 // FIXME: In the future, return a variant or some other clue 8058 // for the consumer of this Decl to know it doesn't own it. 8059 // For our current ASTs this shouldn't be a problem, but will 8060 // need to be changed with DeclGroups. 8061 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 8062 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 8063 return PrevTagDecl; 8064 8065 // Diagnose attempts to redefine a tag. 8066 if (TUK == TUK_Definition) { 8067 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 8068 // If we're defining a specialization and the previous definition 8069 // is from an implicit instantiation, don't emit an error 8070 // here; we'll catch this in the general case below. 8071 if (!isExplicitSpecialization || 8072 !isa<CXXRecordDecl>(Def) || 8073 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 8074 == TSK_ExplicitSpecialization) { 8075 Diag(NameLoc, diag::err_redefinition) << Name; 8076 Diag(Def->getLocation(), diag::note_previous_definition); 8077 // If this is a redefinition, recover by making this 8078 // struct be anonymous, which will make any later 8079 // references get the previous definition. 8080 Name = 0; 8081 Previous.clear(); 8082 Invalid = true; 8083 } 8084 } else { 8085 // If the type is currently being defined, complain 8086 // about a nested redefinition. 8087 const TagType *Tag 8088 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8089 if (Tag->isBeingDefined()) { 8090 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8091 Diag(PrevTagDecl->getLocation(), 8092 diag::note_previous_definition); 8093 Name = 0; 8094 Previous.clear(); 8095 Invalid = true; 8096 } 8097 } 8098 8099 // Okay, this is definition of a previously declared or referenced 8100 // tag PrevDecl. We're going to create a new Decl for it. 8101 } 8102 } 8103 // If we get here we have (another) forward declaration or we 8104 // have a definition. Just create a new decl. 8105 8106 } else { 8107 // If we get here, this is a definition of a new tag type in a nested 8108 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8109 // new decl/type. We set PrevDecl to NULL so that the entities 8110 // have distinct types. 8111 Previous.clear(); 8112 } 8113 // If we get here, we're going to create a new Decl. If PrevDecl 8114 // is non-NULL, it's a definition of the tag declared by 8115 // PrevDecl. If it's NULL, we have a new definition. 8116 8117 8118 // Otherwise, PrevDecl is not a tag, but was found with tag 8119 // lookup. This is only actually possible in C++, where a few 8120 // things like templates still live in the tag namespace. 8121 } else { 8122 // Use a better diagnostic if an elaborated-type-specifier 8123 // found the wrong kind of type on the first 8124 // (non-redeclaration) lookup. 8125 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8126 !Previous.isForRedeclaration()) { 8127 unsigned Kind = 0; 8128 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8129 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8130 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8131 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8132 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8133 Invalid = true; 8134 8135 // Otherwise, only diagnose if the declaration is in scope. 8136 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8137 isExplicitSpecialization)) { 8138 // do nothing 8139 8140 // Diagnose implicit declarations introduced by elaborated types. 8141 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8142 unsigned Kind = 0; 8143 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8144 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8145 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8146 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8147 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8148 Invalid = true; 8149 8150 // Otherwise it's a declaration. Call out a particularly common 8151 // case here. 8152 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8153 unsigned Kind = 0; 8154 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8155 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8156 << Name << Kind << TND->getUnderlyingType(); 8157 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8158 Invalid = true; 8159 8160 // Otherwise, diagnose. 8161 } else { 8162 // The tag name clashes with something else in the target scope, 8163 // issue an error and recover by making this tag be anonymous. 8164 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8165 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8166 Name = 0; 8167 Invalid = true; 8168 } 8169 8170 // The existing declaration isn't relevant to us; we're in a 8171 // new scope, so clear out the previous declaration. 8172 Previous.clear(); 8173 } 8174 } 8175 8176CreateNewDecl: 8177 8178 TagDecl *PrevDecl = 0; 8179 if (Previous.isSingleResult()) 8180 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8181 8182 // If there is an identifier, use the location of the identifier as the 8183 // location of the decl, otherwise use the location of the struct/union 8184 // keyword. 8185 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8186 8187 // Otherwise, create a new declaration. If there is a previous 8188 // declaration of the same entity, the two will be linked via 8189 // PrevDecl. 8190 TagDecl *New; 8191 8192 bool IsForwardReference = false; 8193 if (Kind == TTK_Enum) { 8194 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8195 // enum X { A, B, C } D; D should chain to X. 8196 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8197 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8198 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8199 // If this is an undefined enum, warn. 8200 if (TUK != TUK_Definition && !Invalid) { 8201 TagDecl *Def; 8202 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8203 // C++0x: 7.2p2: opaque-enum-declaration. 8204 // Conflicts are diagnosed above. Do nothing. 8205 } 8206 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8207 Diag(Loc, diag::ext_forward_ref_enum_def) 8208 << New; 8209 Diag(Def->getLocation(), diag::note_previous_definition); 8210 } else { 8211 unsigned DiagID = diag::ext_forward_ref_enum; 8212 if (getLangOptions().MicrosoftExt) 8213 DiagID = diag::ext_ms_forward_ref_enum; 8214 else if (getLangOptions().CPlusPlus) 8215 DiagID = diag::err_forward_ref_enum; 8216 Diag(Loc, DiagID); 8217 8218 // If this is a forward-declared reference to an enumeration, make a 8219 // note of it; we won't actually be introducing the declaration into 8220 // the declaration context. 8221 if (TUK == TUK_Reference) 8222 IsForwardReference = true; 8223 } 8224 } 8225 8226 if (EnumUnderlying) { 8227 EnumDecl *ED = cast<EnumDecl>(New); 8228 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8229 ED->setIntegerTypeSourceInfo(TI); 8230 else 8231 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8232 ED->setPromotionType(ED->getIntegerType()); 8233 } 8234 8235 } else { 8236 // struct/union/class 8237 8238 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8239 // struct X { int A; } D; D should chain to X. 8240 if (getLangOptions().CPlusPlus) { 8241 // FIXME: Look for a way to use RecordDecl for simple structs. 8242 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8243 cast_or_null<CXXRecordDecl>(PrevDecl)); 8244 8245 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8246 StdBadAlloc = cast<CXXRecordDecl>(New); 8247 } else 8248 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8249 cast_or_null<RecordDecl>(PrevDecl)); 8250 } 8251 8252 // Maybe add qualifier info. 8253 if (SS.isNotEmpty()) { 8254 if (SS.isSet()) { 8255 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8256 if (TemplateParameterLists.size() > 0) { 8257 New->setTemplateParameterListsInfo(Context, 8258 TemplateParameterLists.size(), 8259 (TemplateParameterList**) TemplateParameterLists.release()); 8260 } 8261 } 8262 else 8263 Invalid = true; 8264 } 8265 8266 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8267 // Add alignment attributes if necessary; these attributes are checked when 8268 // the ASTContext lays out the structure. 8269 // 8270 // It is important for implementing the correct semantics that this 8271 // happen here (in act on tag decl). The #pragma pack stack is 8272 // maintained as a result of parser callbacks which can occur at 8273 // many points during the parsing of a struct declaration (because 8274 // the #pragma tokens are effectively skipped over during the 8275 // parsing of the struct). 8276 AddAlignmentAttributesForRecord(RD); 8277 8278 AddMsStructLayoutForRecord(RD); 8279 } 8280 8281 if (ModulePrivateLoc.isValid()) { 8282 if (isExplicitSpecialization) 8283 Diag(New->getLocation(), diag::err_module_private_specialization) 8284 << 2 8285 << FixItHint::CreateRemoval(ModulePrivateLoc); 8286 // __module_private__ does not apply to local classes. However, we only 8287 // diagnose this as an error when the declaration specifiers are 8288 // freestanding. Here, we just ignore the __module_private__. 8289 else if (!SearchDC->isFunctionOrMethod()) 8290 New->setModulePrivate(); 8291 } 8292 8293 // If this is a specialization of a member class (of a class template), 8294 // check the specialization. 8295 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8296 Invalid = true; 8297 8298 if (Invalid) 8299 New->setInvalidDecl(); 8300 8301 if (Attr) 8302 ProcessDeclAttributeList(S, New, Attr); 8303 8304 // If we're declaring or defining a tag in function prototype scope 8305 // in C, note that this type can only be used within the function. 8306 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8307 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8308 8309 // Set the lexical context. If the tag has a C++ scope specifier, the 8310 // lexical context will be different from the semantic context. 8311 New->setLexicalDeclContext(CurContext); 8312 8313 // Mark this as a friend decl if applicable. 8314 // In Microsoft mode, a friend declaration also acts as a forward 8315 // declaration so we always pass true to setObjectOfFriendDecl to make 8316 // the tag name visible. 8317 if (TUK == TUK_Friend) 8318 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8319 getLangOptions().MicrosoftExt); 8320 8321 // Set the access specifier. 8322 if (!Invalid && SearchDC->isRecord()) 8323 SetMemberAccessSpecifier(New, PrevDecl, AS); 8324 8325 if (TUK == TUK_Definition) 8326 New->startDefinition(); 8327 8328 // If this has an identifier, add it to the scope stack. 8329 if (TUK == TUK_Friend) { 8330 // We might be replacing an existing declaration in the lookup tables; 8331 // if so, borrow its access specifier. 8332 if (PrevDecl) 8333 New->setAccess(PrevDecl->getAccess()); 8334 8335 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8336 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8337 if (Name) // can be null along some error paths 8338 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8339 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8340 } else if (Name) { 8341 S = getNonFieldDeclScope(S); 8342 PushOnScopeChains(New, S, !IsForwardReference); 8343 if (IsForwardReference) 8344 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8345 8346 } else { 8347 CurContext->addDecl(New); 8348 } 8349 8350 // If this is the C FILE type, notify the AST context. 8351 if (IdentifierInfo *II = New->getIdentifier()) 8352 if (!New->isInvalidDecl() && 8353 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8354 II->isStr("FILE")) 8355 Context.setFILEDecl(New); 8356 8357 OwnedDecl = true; 8358 return New; 8359} 8360 8361void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8362 AdjustDeclIfTemplate(TagD); 8363 TagDecl *Tag = cast<TagDecl>(TagD); 8364 8365 // Enter the tag context. 8366 PushDeclContext(S, Tag); 8367} 8368 8369Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8370 assert(isa<ObjCContainerDecl>(IDecl) && 8371 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8372 DeclContext *OCD = cast<DeclContext>(IDecl); 8373 assert(getContainingDC(OCD) == CurContext && 8374 "The next DeclContext should be lexically contained in the current one."); 8375 CurContext = OCD; 8376 return IDecl; 8377} 8378 8379void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8380 SourceLocation FinalLoc, 8381 SourceLocation LBraceLoc) { 8382 AdjustDeclIfTemplate(TagD); 8383 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8384 8385 FieldCollector->StartClass(); 8386 8387 if (!Record->getIdentifier()) 8388 return; 8389 8390 if (FinalLoc.isValid()) 8391 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8392 8393 // C++ [class]p2: 8394 // [...] The class-name is also inserted into the scope of the 8395 // class itself; this is known as the injected-class-name. For 8396 // purposes of access checking, the injected-class-name is treated 8397 // as if it were a public member name. 8398 CXXRecordDecl *InjectedClassName 8399 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8400 Record->getLocStart(), Record->getLocation(), 8401 Record->getIdentifier(), 8402 /*PrevDecl=*/0, 8403 /*DelayTypeCreation=*/true); 8404 Context.getTypeDeclType(InjectedClassName, Record); 8405 InjectedClassName->setImplicit(); 8406 InjectedClassName->setAccess(AS_public); 8407 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8408 InjectedClassName->setDescribedClassTemplate(Template); 8409 PushOnScopeChains(InjectedClassName, S); 8410 assert(InjectedClassName->isInjectedClassName() && 8411 "Broken injected-class-name"); 8412} 8413 8414void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8415 SourceLocation RBraceLoc) { 8416 AdjustDeclIfTemplate(TagD); 8417 TagDecl *Tag = cast<TagDecl>(TagD); 8418 Tag->setRBraceLoc(RBraceLoc); 8419 8420 if (isa<CXXRecordDecl>(Tag)) 8421 FieldCollector->FinishClass(); 8422 8423 // Exit this scope of this tag's definition. 8424 PopDeclContext(); 8425 8426 // Notify the consumer that we've defined a tag. 8427 Consumer.HandleTagDeclDefinition(Tag); 8428} 8429 8430void Sema::ActOnObjCContainerFinishDefinition() { 8431 // Exit this scope of this interface definition. 8432 PopDeclContext(); 8433} 8434 8435void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8436 assert(DC == CurContext && "Mismatch of container contexts"); 8437 OriginalLexicalContext = DC; 8438 ActOnObjCContainerFinishDefinition(); 8439} 8440 8441void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8442 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8443 OriginalLexicalContext = 0; 8444} 8445 8446void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8447 AdjustDeclIfTemplate(TagD); 8448 TagDecl *Tag = cast<TagDecl>(TagD); 8449 Tag->setInvalidDecl(); 8450 8451 // We're undoing ActOnTagStartDefinition here, not 8452 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8453 // the FieldCollector. 8454 8455 PopDeclContext(); 8456} 8457 8458// Note that FieldName may be null for anonymous bitfields. 8459bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8460 QualType FieldTy, const Expr *BitWidth, 8461 bool *ZeroWidth) { 8462 // Default to true; that shouldn't confuse checks for emptiness 8463 if (ZeroWidth) 8464 *ZeroWidth = true; 8465 8466 // C99 6.7.2.1p4 - verify the field type. 8467 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8468 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8469 // Handle incomplete types with specific error. 8470 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8471 return true; 8472 if (FieldName) 8473 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8474 << FieldName << FieldTy << BitWidth->getSourceRange(); 8475 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8476 << FieldTy << BitWidth->getSourceRange(); 8477 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8478 UPPC_BitFieldWidth)) 8479 return true; 8480 8481 // If the bit-width is type- or value-dependent, don't try to check 8482 // it now. 8483 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8484 return false; 8485 8486 llvm::APSInt Value; 8487 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8488 return true; 8489 8490 if (Value != 0 && ZeroWidth) 8491 *ZeroWidth = false; 8492 8493 // Zero-width bitfield is ok for anonymous field. 8494 if (Value == 0 && FieldName) 8495 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8496 8497 if (Value.isSigned() && Value.isNegative()) { 8498 if (FieldName) 8499 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8500 << FieldName << Value.toString(10); 8501 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8502 << Value.toString(10); 8503 } 8504 8505 if (!FieldTy->isDependentType()) { 8506 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8507 if (Value.getZExtValue() > TypeSize) { 8508 if (!getLangOptions().CPlusPlus) { 8509 if (FieldName) 8510 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8511 << FieldName << (unsigned)Value.getZExtValue() 8512 << (unsigned)TypeSize; 8513 8514 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8515 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8516 } 8517 8518 if (FieldName) 8519 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8520 << FieldName << (unsigned)Value.getZExtValue() 8521 << (unsigned)TypeSize; 8522 else 8523 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8524 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8525 } 8526 } 8527 8528 return false; 8529} 8530 8531/// ActOnField - Each field of a C struct/union is passed into this in order 8532/// to create a FieldDecl object for it. 8533Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8534 Declarator &D, Expr *BitfieldWidth) { 8535 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8536 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8537 /*HasInit=*/false, AS_public); 8538 return Res; 8539} 8540 8541/// HandleField - Analyze a field of a C struct or a C++ data member. 8542/// 8543FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8544 SourceLocation DeclStart, 8545 Declarator &D, Expr *BitWidth, bool HasInit, 8546 AccessSpecifier AS) { 8547 IdentifierInfo *II = D.getIdentifier(); 8548 SourceLocation Loc = DeclStart; 8549 if (II) Loc = D.getIdentifierLoc(); 8550 8551 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8552 QualType T = TInfo->getType(); 8553 if (getLangOptions().CPlusPlus) { 8554 CheckExtraCXXDefaultArguments(D); 8555 8556 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8557 UPPC_DataMemberType)) { 8558 D.setInvalidType(); 8559 T = Context.IntTy; 8560 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8561 } 8562 } 8563 8564 DiagnoseFunctionSpecifiers(D); 8565 8566 if (D.getDeclSpec().isThreadSpecified()) 8567 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8568 if (D.getDeclSpec().isConstexprSpecified()) 8569 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8570 << 2; 8571 8572 // Check to see if this name was declared as a member previously 8573 NamedDecl *PrevDecl = 0; 8574 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8575 LookupName(Previous, S); 8576 switch (Previous.getResultKind()) { 8577 case LookupResult::Found: 8578 case LookupResult::FoundUnresolvedValue: 8579 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8580 break; 8581 8582 case LookupResult::FoundOverloaded: 8583 PrevDecl = Previous.getRepresentativeDecl(); 8584 break; 8585 8586 case LookupResult::NotFound: 8587 case LookupResult::NotFoundInCurrentInstantiation: 8588 case LookupResult::Ambiguous: 8589 break; 8590 } 8591 Previous.suppressDiagnostics(); 8592 8593 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8594 // Maybe we will complain about the shadowed template parameter. 8595 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8596 // Just pretend that we didn't see the previous declaration. 8597 PrevDecl = 0; 8598 } 8599 8600 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8601 PrevDecl = 0; 8602 8603 bool Mutable 8604 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8605 SourceLocation TSSL = D.getSourceRange().getBegin(); 8606 FieldDecl *NewFD 8607 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8608 TSSL, AS, PrevDecl, &D); 8609 8610 if (NewFD->isInvalidDecl()) 8611 Record->setInvalidDecl(); 8612 8613 if (D.getDeclSpec().isModulePrivateSpecified()) 8614 NewFD->setModulePrivate(); 8615 8616 if (NewFD->isInvalidDecl() && PrevDecl) { 8617 // Don't introduce NewFD into scope; there's already something 8618 // with the same name in the same scope. 8619 } else if (II) { 8620 PushOnScopeChains(NewFD, S); 8621 } else 8622 Record->addDecl(NewFD); 8623 8624 return NewFD; 8625} 8626 8627/// \brief Build a new FieldDecl and check its well-formedness. 8628/// 8629/// This routine builds a new FieldDecl given the fields name, type, 8630/// record, etc. \p PrevDecl should refer to any previous declaration 8631/// with the same name and in the same scope as the field to be 8632/// created. 8633/// 8634/// \returns a new FieldDecl. 8635/// 8636/// \todo The Declarator argument is a hack. It will be removed once 8637FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8638 TypeSourceInfo *TInfo, 8639 RecordDecl *Record, SourceLocation Loc, 8640 bool Mutable, Expr *BitWidth, bool HasInit, 8641 SourceLocation TSSL, 8642 AccessSpecifier AS, NamedDecl *PrevDecl, 8643 Declarator *D) { 8644 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8645 bool InvalidDecl = false; 8646 if (D) InvalidDecl = D->isInvalidType(); 8647 8648 // If we receive a broken type, recover by assuming 'int' and 8649 // marking this declaration as invalid. 8650 if (T.isNull()) { 8651 InvalidDecl = true; 8652 T = Context.IntTy; 8653 } 8654 8655 QualType EltTy = Context.getBaseElementType(T); 8656 if (!EltTy->isDependentType() && 8657 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8658 // Fields of incomplete type force their record to be invalid. 8659 Record->setInvalidDecl(); 8660 InvalidDecl = true; 8661 } 8662 8663 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8664 // than a variably modified type. 8665 if (!InvalidDecl && T->isVariablyModifiedType()) { 8666 bool SizeIsNegative; 8667 llvm::APSInt Oversized; 8668 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8669 SizeIsNegative, 8670 Oversized); 8671 if (!FixedTy.isNull()) { 8672 Diag(Loc, diag::warn_illegal_constant_array_size); 8673 T = FixedTy; 8674 } else { 8675 if (SizeIsNegative) 8676 Diag(Loc, diag::err_typecheck_negative_array_size); 8677 else if (Oversized.getBoolValue()) 8678 Diag(Loc, diag::err_array_too_large) 8679 << Oversized.toString(10); 8680 else 8681 Diag(Loc, diag::err_typecheck_field_variable_size); 8682 InvalidDecl = true; 8683 } 8684 } 8685 8686 // Fields can not have abstract class types 8687 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8688 diag::err_abstract_type_in_decl, 8689 AbstractFieldType)) 8690 InvalidDecl = true; 8691 8692 bool ZeroWidth = false; 8693 // If this is declared as a bit-field, check the bit-field. 8694 if (!InvalidDecl && BitWidth && 8695 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8696 InvalidDecl = true; 8697 BitWidth = 0; 8698 ZeroWidth = false; 8699 } 8700 8701 // Check that 'mutable' is consistent with the type of the declaration. 8702 if (!InvalidDecl && Mutable) { 8703 unsigned DiagID = 0; 8704 if (T->isReferenceType()) 8705 DiagID = diag::err_mutable_reference; 8706 else if (T.isConstQualified()) 8707 DiagID = diag::err_mutable_const; 8708 8709 if (DiagID) { 8710 SourceLocation ErrLoc = Loc; 8711 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8712 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8713 Diag(ErrLoc, DiagID); 8714 Mutable = false; 8715 InvalidDecl = true; 8716 } 8717 } 8718 8719 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8720 BitWidth, Mutable, HasInit); 8721 if (InvalidDecl) 8722 NewFD->setInvalidDecl(); 8723 8724 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8725 Diag(Loc, diag::err_duplicate_member) << II; 8726 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8727 NewFD->setInvalidDecl(); 8728 } 8729 8730 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8731 if (Record->isUnion()) { 8732 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8733 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8734 if (RDecl->getDefinition()) { 8735 // C++ [class.union]p1: An object of a class with a non-trivial 8736 // constructor, a non-trivial copy constructor, a non-trivial 8737 // destructor, or a non-trivial copy assignment operator 8738 // cannot be a member of a union, nor can an array of such 8739 // objects. 8740 if (CheckNontrivialField(NewFD)) 8741 NewFD->setInvalidDecl(); 8742 } 8743 } 8744 8745 // C++ [class.union]p1: If a union contains a member of reference type, 8746 // the program is ill-formed. 8747 if (EltTy->isReferenceType()) { 8748 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8749 << NewFD->getDeclName() << EltTy; 8750 NewFD->setInvalidDecl(); 8751 } 8752 } 8753 } 8754 8755 // FIXME: We need to pass in the attributes given an AST 8756 // representation, not a parser representation. 8757 if (D) 8758 // FIXME: What to pass instead of TUScope? 8759 ProcessDeclAttributes(TUScope, NewFD, *D); 8760 8761 // In auto-retain/release, infer strong retension for fields of 8762 // retainable type. 8763 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8764 NewFD->setInvalidDecl(); 8765 8766 if (T.isObjCGCWeak()) 8767 Diag(Loc, diag::warn_attribute_weak_on_field); 8768 8769 NewFD->setAccess(AS); 8770 return NewFD; 8771} 8772 8773bool Sema::CheckNontrivialField(FieldDecl *FD) { 8774 assert(FD); 8775 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8776 8777 if (FD->isInvalidDecl()) 8778 return true; 8779 8780 QualType EltTy = Context.getBaseElementType(FD->getType()); 8781 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8782 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8783 if (RDecl->getDefinition()) { 8784 // We check for copy constructors before constructors 8785 // because otherwise we'll never get complaints about 8786 // copy constructors. 8787 8788 CXXSpecialMember member = CXXInvalid; 8789 if (!RDecl->hasTrivialCopyConstructor()) 8790 member = CXXCopyConstructor; 8791 else if (!RDecl->hasTrivialDefaultConstructor()) 8792 member = CXXDefaultConstructor; 8793 else if (!RDecl->hasTrivialCopyAssignment()) 8794 member = CXXCopyAssignment; 8795 else if (!RDecl->hasTrivialDestructor()) 8796 member = CXXDestructor; 8797 8798 if (member != CXXInvalid) { 8799 if (!getLangOptions().CPlusPlus0x && 8800 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8801 // Objective-C++ ARC: it is an error to have a non-trivial field of 8802 // a union. However, system headers in Objective-C programs 8803 // occasionally have Objective-C lifetime objects within unions, 8804 // and rather than cause the program to fail, we make those 8805 // members unavailable. 8806 SourceLocation Loc = FD->getLocation(); 8807 if (getSourceManager().isInSystemHeader(Loc)) { 8808 if (!FD->hasAttr<UnavailableAttr>()) 8809 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8810 "this system field has retaining ownership")); 8811 return false; 8812 } 8813 } 8814 8815 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8816 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8817 diag::err_illegal_union_or_anon_struct_member) 8818 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8819 DiagnoseNontrivial(RT, member); 8820 return !getLangOptions().CPlusPlus0x; 8821 } 8822 } 8823 } 8824 8825 return false; 8826} 8827 8828/// DiagnoseNontrivial - Given that a class has a non-trivial 8829/// special member, figure out why. 8830void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8831 QualType QT(T, 0U); 8832 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8833 8834 // Check whether the member was user-declared. 8835 switch (member) { 8836 case CXXInvalid: 8837 break; 8838 8839 case CXXDefaultConstructor: 8840 if (RD->hasUserDeclaredConstructor()) { 8841 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8842 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8843 const FunctionDecl *body = 0; 8844 ci->hasBody(body); 8845 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8846 SourceLocation CtorLoc = ci->getLocation(); 8847 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8848 return; 8849 } 8850 } 8851 8852 llvm_unreachable("found no user-declared constructors"); 8853 } 8854 break; 8855 8856 case CXXCopyConstructor: 8857 if (RD->hasUserDeclaredCopyConstructor()) { 8858 SourceLocation CtorLoc = 8859 RD->getCopyConstructor(0)->getLocation(); 8860 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8861 return; 8862 } 8863 break; 8864 8865 case CXXMoveConstructor: 8866 if (RD->hasUserDeclaredMoveConstructor()) { 8867 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8868 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8869 return; 8870 } 8871 break; 8872 8873 case CXXCopyAssignment: 8874 if (RD->hasUserDeclaredCopyAssignment()) { 8875 // FIXME: this should use the location of the copy 8876 // assignment, not the type. 8877 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8878 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8879 return; 8880 } 8881 break; 8882 8883 case CXXMoveAssignment: 8884 if (RD->hasUserDeclaredMoveAssignment()) { 8885 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8886 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8887 return; 8888 } 8889 break; 8890 8891 case CXXDestructor: 8892 if (RD->hasUserDeclaredDestructor()) { 8893 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8894 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8895 return; 8896 } 8897 break; 8898 } 8899 8900 typedef CXXRecordDecl::base_class_iterator base_iter; 8901 8902 // Virtual bases and members inhibit trivial copying/construction, 8903 // but not trivial destruction. 8904 if (member != CXXDestructor) { 8905 // Check for virtual bases. vbases includes indirect virtual bases, 8906 // so we just iterate through the direct bases. 8907 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8908 if (bi->isVirtual()) { 8909 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8910 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8911 return; 8912 } 8913 8914 // Check for virtual methods. 8915 typedef CXXRecordDecl::method_iterator meth_iter; 8916 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8917 ++mi) { 8918 if (mi->isVirtual()) { 8919 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8920 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8921 return; 8922 } 8923 } 8924 } 8925 8926 bool (CXXRecordDecl::*hasTrivial)() const; 8927 switch (member) { 8928 case CXXDefaultConstructor: 8929 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8930 case CXXCopyConstructor: 8931 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8932 case CXXCopyAssignment: 8933 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8934 case CXXDestructor: 8935 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8936 default: 8937 llvm_unreachable("unexpected special member"); 8938 } 8939 8940 // Check for nontrivial bases (and recurse). 8941 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8942 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8943 assert(BaseRT && "Don't know how to handle dependent bases"); 8944 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8945 if (!(BaseRecTy->*hasTrivial)()) { 8946 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8947 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8948 DiagnoseNontrivial(BaseRT, member); 8949 return; 8950 } 8951 } 8952 8953 // Check for nontrivial members (and recurse). 8954 typedef RecordDecl::field_iterator field_iter; 8955 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8956 ++fi) { 8957 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8958 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8959 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8960 8961 if (!(EltRD->*hasTrivial)()) { 8962 SourceLocation FLoc = (*fi)->getLocation(); 8963 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8964 DiagnoseNontrivial(EltRT, member); 8965 return; 8966 } 8967 } 8968 8969 if (EltTy->isObjCLifetimeType()) { 8970 switch (EltTy.getObjCLifetime()) { 8971 case Qualifiers::OCL_None: 8972 case Qualifiers::OCL_ExplicitNone: 8973 break; 8974 8975 case Qualifiers::OCL_Autoreleasing: 8976 case Qualifiers::OCL_Weak: 8977 case Qualifiers::OCL_Strong: 8978 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8979 << QT << EltTy.getObjCLifetime(); 8980 return; 8981 } 8982 } 8983 } 8984 8985 llvm_unreachable("found no explanation for non-trivial member"); 8986} 8987 8988/// TranslateIvarVisibility - Translate visibility from a token ID to an 8989/// AST enum value. 8990static ObjCIvarDecl::AccessControl 8991TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8992 switch (ivarVisibility) { 8993 default: llvm_unreachable("Unknown visitibility kind"); 8994 case tok::objc_private: return ObjCIvarDecl::Private; 8995 case tok::objc_public: return ObjCIvarDecl::Public; 8996 case tok::objc_protected: return ObjCIvarDecl::Protected; 8997 case tok::objc_package: return ObjCIvarDecl::Package; 8998 } 8999} 9000 9001/// ActOnIvar - Each ivar field of an objective-c class is passed into this 9002/// in order to create an IvarDecl object for it. 9003Decl *Sema::ActOnIvar(Scope *S, 9004 SourceLocation DeclStart, 9005 Declarator &D, Expr *BitfieldWidth, 9006 tok::ObjCKeywordKind Visibility) { 9007 9008 IdentifierInfo *II = D.getIdentifier(); 9009 Expr *BitWidth = (Expr*)BitfieldWidth; 9010 SourceLocation Loc = DeclStart; 9011 if (II) Loc = D.getIdentifierLoc(); 9012 9013 // FIXME: Unnamed fields can be handled in various different ways, for 9014 // example, unnamed unions inject all members into the struct namespace! 9015 9016 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9017 QualType T = TInfo->getType(); 9018 9019 if (BitWidth) { 9020 // 6.7.2.1p3, 6.7.2.1p4 9021 if (VerifyBitField(Loc, II, T, BitWidth)) { 9022 D.setInvalidType(); 9023 BitWidth = 0; 9024 } 9025 } else { 9026 // Not a bitfield. 9027 9028 // validate II. 9029 9030 } 9031 if (T->isReferenceType()) { 9032 Diag(Loc, diag::err_ivar_reference_type); 9033 D.setInvalidType(); 9034 } 9035 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9036 // than a variably modified type. 9037 else if (T->isVariablyModifiedType()) { 9038 Diag(Loc, diag::err_typecheck_ivar_variable_size); 9039 D.setInvalidType(); 9040 } 9041 9042 // Get the visibility (access control) for this ivar. 9043 ObjCIvarDecl::AccessControl ac = 9044 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 9045 : ObjCIvarDecl::None; 9046 // Must set ivar's DeclContext to its enclosing interface. 9047 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 9048 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl()) 9049 return 0; 9050 ObjCContainerDecl *EnclosingContext; 9051 if (ObjCImplementationDecl *IMPDecl = 9052 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9053 if (!LangOpts.ObjCNonFragileABI2) { 9054 // Case of ivar declared in an implementation. Context is that of its class. 9055 EnclosingContext = IMPDecl->getClassInterface(); 9056 assert(EnclosingContext && "Implementation has no class interface!"); 9057 } 9058 else 9059 EnclosingContext = EnclosingDecl; 9060 } else { 9061 if (ObjCCategoryDecl *CDecl = 9062 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9063 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 9064 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 9065 return 0; 9066 } 9067 } 9068 EnclosingContext = EnclosingDecl; 9069 } 9070 9071 // Construct the decl. 9072 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 9073 DeclStart, Loc, II, T, 9074 TInfo, ac, (Expr *)BitfieldWidth); 9075 9076 if (II) { 9077 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 9078 ForRedeclaration); 9079 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9080 && !isa<TagDecl>(PrevDecl)) { 9081 Diag(Loc, diag::err_duplicate_member) << II; 9082 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9083 NewID->setInvalidDecl(); 9084 } 9085 } 9086 9087 // Process attributes attached to the ivar. 9088 ProcessDeclAttributes(S, NewID, D); 9089 9090 if (D.isInvalidType()) 9091 NewID->setInvalidDecl(); 9092 9093 // In ARC, infer 'retaining' for ivars of retainable type. 9094 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9095 NewID->setInvalidDecl(); 9096 9097 if (D.getDeclSpec().isModulePrivateSpecified()) 9098 NewID->setModulePrivate(); 9099 9100 if (II) { 9101 // FIXME: When interfaces are DeclContexts, we'll need to add 9102 // these to the interface. 9103 S->AddDecl(NewID); 9104 IdResolver.AddDecl(NewID); 9105 } 9106 9107 return NewID; 9108} 9109 9110/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9111/// class and class extensions. For every class @interface and class 9112/// extension @interface, if the last ivar is a bitfield of any type, 9113/// then add an implicit `char :0` ivar to the end of that interface. 9114void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9115 SmallVectorImpl<Decl *> &AllIvarDecls) { 9116 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9117 return; 9118 9119 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9120 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9121 9122 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9123 return; 9124 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9125 if (!ID) { 9126 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9127 if (!CD->IsClassExtension()) 9128 return; 9129 } 9130 // No need to add this to end of @implementation. 9131 else 9132 return; 9133 } 9134 // All conditions are met. Add a new bitfield to the tail end of ivars. 9135 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9136 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9137 9138 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9139 DeclLoc, DeclLoc, 0, 9140 Context.CharTy, 9141 Context.getTrivialTypeSourceInfo(Context.CharTy, 9142 DeclLoc), 9143 ObjCIvarDecl::Private, BW, 9144 true); 9145 AllIvarDecls.push_back(Ivar); 9146} 9147 9148void Sema::ActOnFields(Scope* S, 9149 SourceLocation RecLoc, Decl *EnclosingDecl, 9150 llvm::ArrayRef<Decl *> Fields, 9151 SourceLocation LBrac, SourceLocation RBrac, 9152 AttributeList *Attr) { 9153 assert(EnclosingDecl && "missing record or interface decl"); 9154 9155 // If the decl this is being inserted into is invalid, then it may be a 9156 // redeclaration or some other bogus case. Don't try to add fields to it. 9157 if (EnclosingDecl->isInvalidDecl()) 9158 return; 9159 9160 // Verify that all the fields are okay. 9161 unsigned NumNamedMembers = 0; 9162 SmallVector<FieldDecl*, 32> RecFields; 9163 9164 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9165 bool ARCErrReported = false; 9166 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9167 i != end; ++i) { 9168 FieldDecl *FD = cast<FieldDecl>(*i); 9169 9170 // Get the type for the field. 9171 const Type *FDTy = FD->getType().getTypePtr(); 9172 9173 if (!FD->isAnonymousStructOrUnion()) { 9174 // Remember all fields written by the user. 9175 RecFields.push_back(FD); 9176 } 9177 9178 // If the field is already invalid for some reason, don't emit more 9179 // diagnostics about it. 9180 if (FD->isInvalidDecl()) { 9181 EnclosingDecl->setInvalidDecl(); 9182 continue; 9183 } 9184 9185 // C99 6.7.2.1p2: 9186 // A structure or union shall not contain a member with 9187 // incomplete or function type (hence, a structure shall not 9188 // contain an instance of itself, but may contain a pointer to 9189 // an instance of itself), except that the last member of a 9190 // structure with more than one named member may have incomplete 9191 // array type; such a structure (and any union containing, 9192 // possibly recursively, a member that is such a structure) 9193 // shall not be a member of a structure or an element of an 9194 // array. 9195 if (FDTy->isFunctionType()) { 9196 // Field declared as a function. 9197 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9198 << FD->getDeclName(); 9199 FD->setInvalidDecl(); 9200 EnclosingDecl->setInvalidDecl(); 9201 continue; 9202 } else if (FDTy->isIncompleteArrayType() && Record && 9203 ((i + 1 == Fields.end() && !Record->isUnion()) || 9204 ((getLangOptions().MicrosoftExt || 9205 getLangOptions().CPlusPlus) && 9206 (i + 1 == Fields.end() || Record->isUnion())))) { 9207 // Flexible array member. 9208 // Microsoft and g++ is more permissive regarding flexible array. 9209 // It will accept flexible array in union and also 9210 // as the sole element of a struct/class. 9211 if (getLangOptions().MicrosoftExt) { 9212 if (Record->isUnion()) 9213 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9214 << FD->getDeclName(); 9215 else if (Fields.size() == 1) 9216 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9217 << FD->getDeclName() << Record->getTagKind(); 9218 } else if (getLangOptions().CPlusPlus) { 9219 if (Record->isUnion()) 9220 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9221 << FD->getDeclName(); 9222 else if (Fields.size() == 1) 9223 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9224 << FD->getDeclName() << Record->getTagKind(); 9225 } else if (NumNamedMembers < 1) { 9226 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9227 << FD->getDeclName(); 9228 FD->setInvalidDecl(); 9229 EnclosingDecl->setInvalidDecl(); 9230 continue; 9231 } 9232 if (!FD->getType()->isDependentType() && 9233 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9234 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9235 << FD->getDeclName() << FD->getType(); 9236 FD->setInvalidDecl(); 9237 EnclosingDecl->setInvalidDecl(); 9238 continue; 9239 } 9240 // Okay, we have a legal flexible array member at the end of the struct. 9241 if (Record) 9242 Record->setHasFlexibleArrayMember(true); 9243 } else if (!FDTy->isDependentType() && 9244 RequireCompleteType(FD->getLocation(), FD->getType(), 9245 diag::err_field_incomplete)) { 9246 // Incomplete type 9247 FD->setInvalidDecl(); 9248 EnclosingDecl->setInvalidDecl(); 9249 continue; 9250 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9251 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9252 // If this is a member of a union, then entire union becomes "flexible". 9253 if (Record && Record->isUnion()) { 9254 Record->setHasFlexibleArrayMember(true); 9255 } else { 9256 // If this is a struct/class and this is not the last element, reject 9257 // it. Note that GCC supports variable sized arrays in the middle of 9258 // structures. 9259 if (i + 1 != Fields.end()) 9260 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9261 << FD->getDeclName() << FD->getType(); 9262 else { 9263 // We support flexible arrays at the end of structs in 9264 // other structs as an extension. 9265 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9266 << FD->getDeclName(); 9267 if (Record) 9268 Record->setHasFlexibleArrayMember(true); 9269 } 9270 } 9271 } 9272 if (Record && FDTTy->getDecl()->hasObjectMember()) 9273 Record->setHasObjectMember(true); 9274 } else if (FDTy->isObjCObjectType()) { 9275 /// A field cannot be an Objective-c object 9276 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9277 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9278 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9279 FD->setType(T); 9280 } 9281 else if (!getLangOptions().CPlusPlus) { 9282 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9283 // It's an error in ARC if a field has lifetime. 9284 // We don't want to report this in a system header, though, 9285 // so we just make the field unavailable. 9286 // FIXME: that's really not sufficient; we need to make the type 9287 // itself invalid to, say, initialize or copy. 9288 QualType T = FD->getType(); 9289 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9290 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9291 SourceLocation loc = FD->getLocation(); 9292 if (getSourceManager().isInSystemHeader(loc)) { 9293 if (!FD->hasAttr<UnavailableAttr>()) { 9294 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9295 "this system field has retaining ownership")); 9296 } 9297 } else { 9298 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9299 << T->isBlockPointerType(); 9300 } 9301 ARCErrReported = true; 9302 } 9303 } 9304 else if (getLangOptions().ObjC1 && 9305 getLangOptions().getGC() != LangOptions::NonGC && 9306 Record && !Record->hasObjectMember()) { 9307 if (FD->getType()->isObjCObjectPointerType() || 9308 FD->getType().isObjCGCStrong()) 9309 Record->setHasObjectMember(true); 9310 else if (Context.getAsArrayType(FD->getType())) { 9311 QualType BaseType = Context.getBaseElementType(FD->getType()); 9312 if (BaseType->isRecordType() && 9313 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9314 Record->setHasObjectMember(true); 9315 else if (BaseType->isObjCObjectPointerType() || 9316 BaseType.isObjCGCStrong()) 9317 Record->setHasObjectMember(true); 9318 } 9319 } 9320 } 9321 // Keep track of the number of named members. 9322 if (FD->getIdentifier()) 9323 ++NumNamedMembers; 9324 } 9325 9326 // Okay, we successfully defined 'Record'. 9327 if (Record) { 9328 bool Completed = false; 9329 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9330 if (!CXXRecord->isInvalidDecl()) { 9331 // Set access bits correctly on the directly-declared conversions. 9332 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9333 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9334 I != E; ++I) 9335 Convs->setAccess(I, (*I)->getAccess()); 9336 9337 if (!CXXRecord->isDependentType()) { 9338 // Objective-C Automatic Reference Counting: 9339 // If a class has a non-static data member of Objective-C pointer 9340 // type (or array thereof), it is a non-POD type and its 9341 // default constructor (if any), copy constructor, copy assignment 9342 // operator, and destructor are non-trivial. 9343 // 9344 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9345 // However, here we check whether this particular class is only 9346 // non-POD because of the presence of an Objective-C pointer member. 9347 // If so, objects of this type cannot be shared between code compiled 9348 // with instant objects and code compiled with manual retain/release. 9349 if (getLangOptions().ObjCAutoRefCount && 9350 CXXRecord->hasObjectMember() && 9351 CXXRecord->getLinkage() == ExternalLinkage) { 9352 if (CXXRecord->isPOD()) { 9353 Diag(CXXRecord->getLocation(), 9354 diag::warn_arc_non_pod_class_with_object_member) 9355 << CXXRecord; 9356 } else { 9357 // FIXME: Fix-Its would be nice here, but finding a good location 9358 // for them is going to be tricky. 9359 if (CXXRecord->hasTrivialCopyConstructor()) 9360 Diag(CXXRecord->getLocation(), 9361 diag::warn_arc_trivial_member_function_with_object_member) 9362 << CXXRecord << 0; 9363 if (CXXRecord->hasTrivialCopyAssignment()) 9364 Diag(CXXRecord->getLocation(), 9365 diag::warn_arc_trivial_member_function_with_object_member) 9366 << CXXRecord << 1; 9367 if (CXXRecord->hasTrivialDestructor()) 9368 Diag(CXXRecord->getLocation(), 9369 diag::warn_arc_trivial_member_function_with_object_member) 9370 << CXXRecord << 2; 9371 } 9372 } 9373 9374 // Adjust user-defined destructor exception spec. 9375 if (getLangOptions().CPlusPlus0x && 9376 CXXRecord->hasUserDeclaredDestructor()) 9377 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9378 9379 // Add any implicitly-declared members to this class. 9380 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9381 9382 // If we have virtual base classes, we may end up finding multiple 9383 // final overriders for a given virtual function. Check for this 9384 // problem now. 9385 if (CXXRecord->getNumVBases()) { 9386 CXXFinalOverriderMap FinalOverriders; 9387 CXXRecord->getFinalOverriders(FinalOverriders); 9388 9389 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9390 MEnd = FinalOverriders.end(); 9391 M != MEnd; ++M) { 9392 for (OverridingMethods::iterator SO = M->second.begin(), 9393 SOEnd = M->second.end(); 9394 SO != SOEnd; ++SO) { 9395 assert(SO->second.size() > 0 && 9396 "Virtual function without overridding functions?"); 9397 if (SO->second.size() == 1) 9398 continue; 9399 9400 // C++ [class.virtual]p2: 9401 // In a derived class, if a virtual member function of a base 9402 // class subobject has more than one final overrider the 9403 // program is ill-formed. 9404 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9405 << (NamedDecl *)M->first << Record; 9406 Diag(M->first->getLocation(), 9407 diag::note_overridden_virtual_function); 9408 for (OverridingMethods::overriding_iterator 9409 OM = SO->second.begin(), 9410 OMEnd = SO->second.end(); 9411 OM != OMEnd; ++OM) 9412 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9413 << (NamedDecl *)M->first << OM->Method->getParent(); 9414 9415 Record->setInvalidDecl(); 9416 } 9417 } 9418 CXXRecord->completeDefinition(&FinalOverriders); 9419 Completed = true; 9420 } 9421 } 9422 } 9423 } 9424 9425 if (!Completed) 9426 Record->completeDefinition(); 9427 9428 // Now that the record is complete, do any delayed exception spec checks 9429 // we were missing. 9430 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9431 const CXXDestructorDecl *Dtor = 9432 DelayedDestructorExceptionSpecChecks.back().first; 9433 if (Dtor->getParent() != Record) 9434 break; 9435 9436 assert(!Dtor->getParent()->isDependentType() && 9437 "Should not ever add destructors of templates into the list."); 9438 CheckOverridingFunctionExceptionSpec(Dtor, 9439 DelayedDestructorExceptionSpecChecks.back().second); 9440 DelayedDestructorExceptionSpecChecks.pop_back(); 9441 } 9442 9443 } else { 9444 ObjCIvarDecl **ClsFields = 9445 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9446 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9447 ID->setEndOfDefinitionLoc(RBrac); 9448 // Add ivar's to class's DeclContext. 9449 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9450 ClsFields[i]->setLexicalDeclContext(ID); 9451 ID->addDecl(ClsFields[i]); 9452 } 9453 // Must enforce the rule that ivars in the base classes may not be 9454 // duplicates. 9455 if (ID->getSuperClass()) 9456 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9457 } else if (ObjCImplementationDecl *IMPDecl = 9458 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9459 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9460 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9461 // Ivar declared in @implementation never belongs to the implementation. 9462 // Only it is in implementation's lexical context. 9463 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9464 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9465 } else if (ObjCCategoryDecl *CDecl = 9466 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9467 // case of ivars in class extension; all other cases have been 9468 // reported as errors elsewhere. 9469 // FIXME. Class extension does not have a LocEnd field. 9470 // CDecl->setLocEnd(RBrac); 9471 // Add ivar's to class extension's DeclContext. 9472 // Diagnose redeclaration of private ivars. 9473 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9474 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9475 if (IDecl) { 9476 if (const ObjCIvarDecl *ClsIvar = 9477 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9478 Diag(ClsFields[i]->getLocation(), 9479 diag::err_duplicate_ivar_declaration); 9480 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9481 continue; 9482 } 9483 for (const ObjCCategoryDecl *ClsExtDecl = 9484 IDecl->getFirstClassExtension(); 9485 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9486 if (const ObjCIvarDecl *ClsExtIvar = 9487 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9488 Diag(ClsFields[i]->getLocation(), 9489 diag::err_duplicate_ivar_declaration); 9490 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9491 continue; 9492 } 9493 } 9494 } 9495 ClsFields[i]->setLexicalDeclContext(CDecl); 9496 CDecl->addDecl(ClsFields[i]); 9497 } 9498 } 9499 } 9500 9501 if (Attr) 9502 ProcessDeclAttributeList(S, Record, Attr); 9503 9504 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9505 // set the visibility of this record. 9506 if (Record && !Record->getDeclContext()->isRecord()) 9507 AddPushedVisibilityAttribute(Record); 9508} 9509 9510/// \brief Determine whether the given integral value is representable within 9511/// the given type T. 9512static bool isRepresentableIntegerValue(ASTContext &Context, 9513 llvm::APSInt &Value, 9514 QualType T) { 9515 assert(T->isIntegralType(Context) && "Integral type required!"); 9516 unsigned BitWidth = Context.getIntWidth(T); 9517 9518 if (Value.isUnsigned() || Value.isNonNegative()) { 9519 if (T->isSignedIntegerOrEnumerationType()) 9520 --BitWidth; 9521 return Value.getActiveBits() <= BitWidth; 9522 } 9523 return Value.getMinSignedBits() <= BitWidth; 9524} 9525 9526// \brief Given an integral type, return the next larger integral type 9527// (or a NULL type of no such type exists). 9528static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9529 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9530 // enum checking below. 9531 assert(T->isIntegralType(Context) && "Integral type required!"); 9532 const unsigned NumTypes = 4; 9533 QualType SignedIntegralTypes[NumTypes] = { 9534 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9535 }; 9536 QualType UnsignedIntegralTypes[NumTypes] = { 9537 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9538 Context.UnsignedLongLongTy 9539 }; 9540 9541 unsigned BitWidth = Context.getTypeSize(T); 9542 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9543 : UnsignedIntegralTypes; 9544 for (unsigned I = 0; I != NumTypes; ++I) 9545 if (Context.getTypeSize(Types[I]) > BitWidth) 9546 return Types[I]; 9547 9548 return QualType(); 9549} 9550 9551EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9552 EnumConstantDecl *LastEnumConst, 9553 SourceLocation IdLoc, 9554 IdentifierInfo *Id, 9555 Expr *Val) { 9556 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9557 llvm::APSInt EnumVal(IntWidth); 9558 QualType EltTy; 9559 9560 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9561 Val = 0; 9562 9563 if (Val) 9564 Val = DefaultLvalueConversion(Val).take(); 9565 9566 if (Val) { 9567 if (Enum->isDependentType() || Val->isTypeDependent()) 9568 EltTy = Context.DependentTy; 9569 else { 9570 SourceLocation ExpLoc; 9571 if (getLangOptions().CPlusPlus0x && Enum->isFixed() && 9572 !getLangOptions().MicrosoftMode) { 9573 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the 9574 // constant-expression in the enumerator-definition shall be a converted 9575 // constant expression of the underlying type. 9576 EltTy = Enum->getIntegerType(); 9577 ExprResult Converted = 9578 CheckConvertedConstantExpression(Val, EltTy, EnumVal, 9579 CCEK_Enumerator); 9580 if (Converted.isInvalid()) 9581 Val = 0; 9582 else 9583 Val = Converted.take(); 9584 } else if (!Val->isValueDependent() && 9585 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9586 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9587 Val = 0; 9588 } else { 9589 if (!getLangOptions().CPlusPlus) { 9590 // C99 6.7.2.2p2: 9591 // The expression that defines the value of an enumeration constant 9592 // shall be an integer constant expression that has a value 9593 // representable as an int. 9594 9595 // Complain if the value is not representable in an int. 9596 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9597 Diag(IdLoc, diag::ext_enum_value_not_int) 9598 << EnumVal.toString(10) << Val->getSourceRange() 9599 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9600 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9601 // Force the type of the expression to 'int'. 9602 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9603 } 9604 } 9605 9606 if (Enum->isFixed()) { 9607 EltTy = Enum->getIntegerType(); 9608 9609 // In Obj-C and Microsoft mode, require the enumeration value to be 9610 // representable in the underlying type of the enumeration. In C++11, 9611 // we perform a non-narrowing conversion as part of converted constant 9612 // expression checking. 9613 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9614 if (getLangOptions().MicrosoftExt) { 9615 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9616 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9617 } else 9618 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy; 9619 } else 9620 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9621 } else { 9622 // C++11 [dcl.enum]p5: 9623 // If the underlying type is not fixed, the type of each enumerator 9624 // is the type of its initializing value: 9625 // - If an initializer is specified for an enumerator, the 9626 // initializing value has the same type as the expression. 9627 EltTy = Val->getType(); 9628 } 9629 } 9630 } 9631 } 9632 9633 if (!Val) { 9634 if (Enum->isDependentType()) 9635 EltTy = Context.DependentTy; 9636 else if (!LastEnumConst) { 9637 // C++0x [dcl.enum]p5: 9638 // If the underlying type is not fixed, the type of each enumerator 9639 // is the type of its initializing value: 9640 // - If no initializer is specified for the first enumerator, the 9641 // initializing value has an unspecified integral type. 9642 // 9643 // GCC uses 'int' for its unspecified integral type, as does 9644 // C99 6.7.2.2p3. 9645 if (Enum->isFixed()) { 9646 EltTy = Enum->getIntegerType(); 9647 } 9648 else { 9649 EltTy = Context.IntTy; 9650 } 9651 } else { 9652 // Assign the last value + 1. 9653 EnumVal = LastEnumConst->getInitVal(); 9654 ++EnumVal; 9655 EltTy = LastEnumConst->getType(); 9656 9657 // Check for overflow on increment. 9658 if (EnumVal < LastEnumConst->getInitVal()) { 9659 // C++0x [dcl.enum]p5: 9660 // If the underlying type is not fixed, the type of each enumerator 9661 // is the type of its initializing value: 9662 // 9663 // - Otherwise the type of the initializing value is the same as 9664 // the type of the initializing value of the preceding enumerator 9665 // unless the incremented value is not representable in that type, 9666 // in which case the type is an unspecified integral type 9667 // sufficient to contain the incremented value. If no such type 9668 // exists, the program is ill-formed. 9669 QualType T = getNextLargerIntegralType(Context, EltTy); 9670 if (T.isNull() || Enum->isFixed()) { 9671 // There is no integral type larger enough to represent this 9672 // value. Complain, then allow the value to wrap around. 9673 EnumVal = LastEnumConst->getInitVal(); 9674 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9675 ++EnumVal; 9676 if (Enum->isFixed()) 9677 // When the underlying type is fixed, this is ill-formed. 9678 Diag(IdLoc, diag::err_enumerator_wrapped) 9679 << EnumVal.toString(10) 9680 << EltTy; 9681 else 9682 Diag(IdLoc, diag::warn_enumerator_too_large) 9683 << EnumVal.toString(10); 9684 } else { 9685 EltTy = T; 9686 } 9687 9688 // Retrieve the last enumerator's value, extent that type to the 9689 // type that is supposed to be large enough to represent the incremented 9690 // value, then increment. 9691 EnumVal = LastEnumConst->getInitVal(); 9692 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9693 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9694 ++EnumVal; 9695 9696 // If we're not in C++, diagnose the overflow of enumerator values, 9697 // which in C99 means that the enumerator value is not representable in 9698 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9699 // permits enumerator values that are representable in some larger 9700 // integral type. 9701 if (!getLangOptions().CPlusPlus && !T.isNull()) 9702 Diag(IdLoc, diag::warn_enum_value_overflow); 9703 } else if (!getLangOptions().CPlusPlus && 9704 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9705 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9706 Diag(IdLoc, diag::ext_enum_value_not_int) 9707 << EnumVal.toString(10) << 1; 9708 } 9709 } 9710 } 9711 9712 if (!EltTy->isDependentType()) { 9713 // Make the enumerator value match the signedness and size of the 9714 // enumerator's type. 9715 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9716 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9717 } 9718 9719 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9720 Val, EnumVal); 9721} 9722 9723 9724Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9725 SourceLocation IdLoc, IdentifierInfo *Id, 9726 AttributeList *Attr, 9727 SourceLocation EqualLoc, Expr *Val) { 9728 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9729 EnumConstantDecl *LastEnumConst = 9730 cast_or_null<EnumConstantDecl>(lastEnumConst); 9731 9732 // The scope passed in may not be a decl scope. Zip up the scope tree until 9733 // we find one that is. 9734 S = getNonFieldDeclScope(S); 9735 9736 // Verify that there isn't already something declared with this name in this 9737 // scope. 9738 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9739 ForRedeclaration); 9740 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9741 // Maybe we will complain about the shadowed template parameter. 9742 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9743 // Just pretend that we didn't see the previous declaration. 9744 PrevDecl = 0; 9745 } 9746 9747 if (PrevDecl) { 9748 // When in C++, we may get a TagDecl with the same name; in this case the 9749 // enum constant will 'hide' the tag. 9750 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9751 "Received TagDecl when not in C++!"); 9752 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9753 if (isa<EnumConstantDecl>(PrevDecl)) 9754 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9755 else 9756 Diag(IdLoc, diag::err_redefinition) << Id; 9757 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9758 return 0; 9759 } 9760 } 9761 9762 // C++ [class.mem]p13: 9763 // If T is the name of a class, then each of the following shall have a 9764 // name different from T: 9765 // - every enumerator of every member of class T that is an enumerated 9766 // type 9767 if (CXXRecordDecl *Record 9768 = dyn_cast<CXXRecordDecl>( 9769 TheEnumDecl->getDeclContext()->getRedeclContext())) 9770 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9771 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9772 9773 EnumConstantDecl *New = 9774 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9775 9776 if (New) { 9777 // Process attributes. 9778 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9779 9780 // Register this decl in the current scope stack. 9781 New->setAccess(TheEnumDecl->getAccess()); 9782 PushOnScopeChains(New, S); 9783 } 9784 9785 return New; 9786} 9787 9788void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9789 SourceLocation RBraceLoc, Decl *EnumDeclX, 9790 Decl **Elements, unsigned NumElements, 9791 Scope *S, AttributeList *Attr) { 9792 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9793 QualType EnumType = Context.getTypeDeclType(Enum); 9794 9795 if (Attr) 9796 ProcessDeclAttributeList(S, Enum, Attr); 9797 9798 if (Enum->isDependentType()) { 9799 for (unsigned i = 0; i != NumElements; ++i) { 9800 EnumConstantDecl *ECD = 9801 cast_or_null<EnumConstantDecl>(Elements[i]); 9802 if (!ECD) continue; 9803 9804 ECD->setType(EnumType); 9805 } 9806 9807 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9808 return; 9809 } 9810 9811 // TODO: If the result value doesn't fit in an int, it must be a long or long 9812 // long value. ISO C does not support this, but GCC does as an extension, 9813 // emit a warning. 9814 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9815 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9816 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9817 9818 // Verify that all the values are okay, compute the size of the values, and 9819 // reverse the list. 9820 unsigned NumNegativeBits = 0; 9821 unsigned NumPositiveBits = 0; 9822 9823 // Keep track of whether all elements have type int. 9824 bool AllElementsInt = true; 9825 9826 for (unsigned i = 0; i != NumElements; ++i) { 9827 EnumConstantDecl *ECD = 9828 cast_or_null<EnumConstantDecl>(Elements[i]); 9829 if (!ECD) continue; // Already issued a diagnostic. 9830 9831 const llvm::APSInt &InitVal = ECD->getInitVal(); 9832 9833 // Keep track of the size of positive and negative values. 9834 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9835 NumPositiveBits = std::max(NumPositiveBits, 9836 (unsigned)InitVal.getActiveBits()); 9837 else 9838 NumNegativeBits = std::max(NumNegativeBits, 9839 (unsigned)InitVal.getMinSignedBits()); 9840 9841 // Keep track of whether every enum element has type int (very commmon). 9842 if (AllElementsInt) 9843 AllElementsInt = ECD->getType() == Context.IntTy; 9844 } 9845 9846 // Figure out the type that should be used for this enum. 9847 QualType BestType; 9848 unsigned BestWidth; 9849 9850 // C++0x N3000 [conv.prom]p3: 9851 // An rvalue of an unscoped enumeration type whose underlying 9852 // type is not fixed can be converted to an rvalue of the first 9853 // of the following types that can represent all the values of 9854 // the enumeration: int, unsigned int, long int, unsigned long 9855 // int, long long int, or unsigned long long int. 9856 // C99 6.4.4.3p2: 9857 // An identifier declared as an enumeration constant has type int. 9858 // The C99 rule is modified by a gcc extension 9859 QualType BestPromotionType; 9860 9861 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9862 // -fshort-enums is the equivalent to specifying the packed attribute on all 9863 // enum definitions. 9864 if (LangOpts.ShortEnums) 9865 Packed = true; 9866 9867 if (Enum->isFixed()) { 9868 BestType = Enum->getIntegerType(); 9869 if (BestType->isPromotableIntegerType()) 9870 BestPromotionType = Context.getPromotedIntegerType(BestType); 9871 else 9872 BestPromotionType = BestType; 9873 // We don't need to set BestWidth, because BestType is going to be the type 9874 // of the enumerators, but we do anyway because otherwise some compilers 9875 // warn that it might be used uninitialized. 9876 BestWidth = CharWidth; 9877 } 9878 else if (NumNegativeBits) { 9879 // If there is a negative value, figure out the smallest integer type (of 9880 // int/long/longlong) that fits. 9881 // If it's packed, check also if it fits a char or a short. 9882 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9883 BestType = Context.SignedCharTy; 9884 BestWidth = CharWidth; 9885 } else if (Packed && NumNegativeBits <= ShortWidth && 9886 NumPositiveBits < ShortWidth) { 9887 BestType = Context.ShortTy; 9888 BestWidth = ShortWidth; 9889 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9890 BestType = Context.IntTy; 9891 BestWidth = IntWidth; 9892 } else { 9893 BestWidth = Context.getTargetInfo().getLongWidth(); 9894 9895 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9896 BestType = Context.LongTy; 9897 } else { 9898 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9899 9900 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9901 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9902 BestType = Context.LongLongTy; 9903 } 9904 } 9905 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9906 } else { 9907 // If there is no negative value, figure out the smallest type that fits 9908 // all of the enumerator values. 9909 // If it's packed, check also if it fits a char or a short. 9910 if (Packed && NumPositiveBits <= CharWidth) { 9911 BestType = Context.UnsignedCharTy; 9912 BestPromotionType = Context.IntTy; 9913 BestWidth = CharWidth; 9914 } else if (Packed && NumPositiveBits <= ShortWidth) { 9915 BestType = Context.UnsignedShortTy; 9916 BestPromotionType = Context.IntTy; 9917 BestWidth = ShortWidth; 9918 } else if (NumPositiveBits <= IntWidth) { 9919 BestType = Context.UnsignedIntTy; 9920 BestWidth = IntWidth; 9921 BestPromotionType 9922 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9923 ? Context.UnsignedIntTy : Context.IntTy; 9924 } else if (NumPositiveBits <= 9925 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9926 BestType = Context.UnsignedLongTy; 9927 BestPromotionType 9928 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9929 ? Context.UnsignedLongTy : Context.LongTy; 9930 } else { 9931 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9932 assert(NumPositiveBits <= BestWidth && 9933 "How could an initializer get larger than ULL?"); 9934 BestType = Context.UnsignedLongLongTy; 9935 BestPromotionType 9936 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9937 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9938 } 9939 } 9940 9941 // Loop over all of the enumerator constants, changing their types to match 9942 // the type of the enum if needed. 9943 for (unsigned i = 0; i != NumElements; ++i) { 9944 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9945 if (!ECD) continue; // Already issued a diagnostic. 9946 9947 // Standard C says the enumerators have int type, but we allow, as an 9948 // extension, the enumerators to be larger than int size. If each 9949 // enumerator value fits in an int, type it as an int, otherwise type it the 9950 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9951 // that X has type 'int', not 'unsigned'. 9952 9953 // Determine whether the value fits into an int. 9954 llvm::APSInt InitVal = ECD->getInitVal(); 9955 9956 // If it fits into an integer type, force it. Otherwise force it to match 9957 // the enum decl type. 9958 QualType NewTy; 9959 unsigned NewWidth; 9960 bool NewSign; 9961 if (!getLangOptions().CPlusPlus && 9962 !Enum->isFixed() && 9963 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9964 NewTy = Context.IntTy; 9965 NewWidth = IntWidth; 9966 NewSign = true; 9967 } else if (ECD->getType() == BestType) { 9968 // Already the right type! 9969 if (getLangOptions().CPlusPlus) 9970 // C++ [dcl.enum]p4: Following the closing brace of an 9971 // enum-specifier, each enumerator has the type of its 9972 // enumeration. 9973 ECD->setType(EnumType); 9974 continue; 9975 } else { 9976 NewTy = BestType; 9977 NewWidth = BestWidth; 9978 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9979 } 9980 9981 // Adjust the APSInt value. 9982 InitVal = InitVal.extOrTrunc(NewWidth); 9983 InitVal.setIsSigned(NewSign); 9984 ECD->setInitVal(InitVal); 9985 9986 // Adjust the Expr initializer and type. 9987 if (ECD->getInitExpr() && 9988 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9989 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9990 CK_IntegralCast, 9991 ECD->getInitExpr(), 9992 /*base paths*/ 0, 9993 VK_RValue)); 9994 if (getLangOptions().CPlusPlus) 9995 // C++ [dcl.enum]p4: Following the closing brace of an 9996 // enum-specifier, each enumerator has the type of its 9997 // enumeration. 9998 ECD->setType(EnumType); 9999 else 10000 ECD->setType(NewTy); 10001 } 10002 10003 Enum->completeDefinition(BestType, BestPromotionType, 10004 NumPositiveBits, NumNegativeBits); 10005} 10006 10007Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 10008 SourceLocation StartLoc, 10009 SourceLocation EndLoc) { 10010 StringLiteral *AsmString = cast<StringLiteral>(expr); 10011 10012 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 10013 AsmString, StartLoc, 10014 EndLoc); 10015 CurContext->addDecl(New); 10016 return New; 10017} 10018 10019DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 10020 SourceLocation ImportLoc, 10021 ModuleIdPath Path) { 10022 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 10023 Module::AllVisible, 10024 /*IsIncludeDirective=*/false); 10025 if (!Mod) 10026 return true; 10027 10028 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 10029 Module *ModCheck = Mod; 10030 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 10031 // If we've run out of module parents, just drop the remaining identifiers. 10032 // We need the length to be consistent. 10033 if (!ModCheck) 10034 break; 10035 ModCheck = ModCheck->Parent; 10036 10037 IdentifierLocs.push_back(Path[I].second); 10038 } 10039 10040 ImportDecl *Import = ImportDecl::Create(Context, 10041 Context.getTranslationUnitDecl(), 10042 AtLoc.isValid()? AtLoc : ImportLoc, 10043 Mod, IdentifierLocs); 10044 Context.getTranslationUnitDecl()->addDecl(Import); 10045 return Import; 10046} 10047 10048void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 10049 SourceLocation PragmaLoc, 10050 SourceLocation NameLoc) { 10051 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 10052 10053 if (PrevDecl) { 10054 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 10055 } else { 10056 (void)WeakUndeclaredIdentifiers.insert( 10057 std::pair<IdentifierInfo*,WeakInfo> 10058 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 10059 } 10060} 10061 10062void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 10063 IdentifierInfo* AliasName, 10064 SourceLocation PragmaLoc, 10065 SourceLocation NameLoc, 10066 SourceLocation AliasNameLoc) { 10067 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 10068 LookupOrdinaryName); 10069 WeakInfo W = WeakInfo(Name, NameLoc); 10070 10071 if (PrevDecl) { 10072 if (!PrevDecl->hasAttr<AliasAttr>()) 10073 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 10074 DeclApplyPragmaWeak(TUScope, ND, W); 10075 } else { 10076 (void)WeakUndeclaredIdentifiers.insert( 10077 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 10078 } 10079} 10080 10081Decl *Sema::getObjCDeclContext() const { 10082 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 10083} 10084 10085AvailabilityResult Sema::getCurContextAvailability() const { 10086 const Decl *D = cast<Decl>(getCurLexicalContext()); 10087 // A category implicitly has the availability of the interface. 10088 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 10089 D = CatD->getClassInterface(); 10090 10091 return D->getAvailability(); 10092} 10093