SemaDecl.cpp revision 8fe83e1df954d72c0f4ffc15d20a5222ec151c21
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/Sema/CXXFieldCollector.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "TypeLocBuilder.h" 21#include "clang/AST/ASTConsumer.h" 22#include "clang/AST/ASTContext.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclCXX.h" 25#include "clang/AST/DeclObjC.h" 26#include "clang/AST/DeclTemplate.h" 27#include "clang/AST/EvaluatedExprVisitor.h" 28#include "clang/AST/ExprCXX.h" 29#include "clang/AST/StmtCXX.h" 30#include "clang/AST/CharUnits.h" 31#include "clang/Sema/DeclSpec.h" 32#include "clang/Sema/ParsedTemplate.h" 33#include "clang/Parse/ParseDiagnostic.h" 34#include "clang/Basic/PartialDiagnostic.h" 35#include "clang/Sema/DelayedDiagnostic.h" 36#include "clang/Basic/SourceManager.h" 37#include "clang/Basic/TargetInfo.h" 38// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 39#include "clang/Lex/Preprocessor.h" 40#include "clang/Lex/HeaderSearch.h" 41#include "clang/Lex/ModuleLoader.h" 42#include "llvm/ADT/SmallString.h" 43#include "llvm/ADT/Triple.h" 44#include <algorithm> 45#include <cstring> 46#include <functional> 47using namespace clang; 48using namespace sema; 49 50Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 51 if (OwnedType) { 52 Decl *Group[2] = { OwnedType, Ptr }; 53 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 54 } 55 56 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 57} 58 59namespace { 60 61class TypeNameValidatorCCC : public CorrectionCandidateCallback { 62 public: 63 TypeNameValidatorCCC(bool AllowInvalid) : AllowInvalidDecl(AllowInvalid) { 64 WantExpressionKeywords = false; 65 WantCXXNamedCasts = false; 66 WantRemainingKeywords = false; 67 } 68 69 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 70 if (NamedDecl *ND = candidate.getCorrectionDecl()) 71 return (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND)) && 72 (AllowInvalidDecl || !ND->isInvalidDecl()); 73 else 74 return candidate.isKeyword(); 75 } 76 77 private: 78 bool AllowInvalidDecl; 79}; 80 81} 82 83/// \brief If the identifier refers to a type name within this scope, 84/// return the declaration of that type. 85/// 86/// This routine performs ordinary name lookup of the identifier II 87/// within the given scope, with optional C++ scope specifier SS, to 88/// determine whether the name refers to a type. If so, returns an 89/// opaque pointer (actually a QualType) corresponding to that 90/// type. Otherwise, returns NULL. 91/// 92/// If name lookup results in an ambiguity, this routine will complain 93/// and then return NULL. 94ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 95 Scope *S, CXXScopeSpec *SS, 96 bool isClassName, bool HasTrailingDot, 97 ParsedType ObjectTypePtr, 98 bool IsCtorOrDtorName, 99 bool WantNontrivialTypeSourceInfo, 100 IdentifierInfo **CorrectedII) { 101 // Determine where we will perform name lookup. 102 DeclContext *LookupCtx = 0; 103 if (ObjectTypePtr) { 104 QualType ObjectType = ObjectTypePtr.get(); 105 if (ObjectType->isRecordType()) 106 LookupCtx = computeDeclContext(ObjectType); 107 } else if (SS && SS->isNotEmpty()) { 108 LookupCtx = computeDeclContext(*SS, false); 109 110 if (!LookupCtx) { 111 if (isDependentScopeSpecifier(*SS)) { 112 // C++ [temp.res]p3: 113 // A qualified-id that refers to a type and in which the 114 // nested-name-specifier depends on a template-parameter (14.6.2) 115 // shall be prefixed by the keyword typename to indicate that the 116 // qualified-id denotes a type, forming an 117 // elaborated-type-specifier (7.1.5.3). 118 // 119 // We therefore do not perform any name lookup if the result would 120 // refer to a member of an unknown specialization. 121 if (!isClassName) 122 return ParsedType(); 123 124 // We know from the grammar that this name refers to a type, 125 // so build a dependent node to describe the type. 126 if (WantNontrivialTypeSourceInfo) 127 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 128 129 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 130 QualType T = 131 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 132 II, NameLoc); 133 134 return ParsedType::make(T); 135 } 136 137 return ParsedType(); 138 } 139 140 if (!LookupCtx->isDependentContext() && 141 RequireCompleteDeclContext(*SS, LookupCtx)) 142 return ParsedType(); 143 } 144 145 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 146 // lookup for class-names. 147 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 148 LookupOrdinaryName; 149 LookupResult Result(*this, &II, NameLoc, Kind); 150 if (LookupCtx) { 151 // Perform "qualified" name lookup into the declaration context we 152 // computed, which is either the type of the base of a member access 153 // expression or the declaration context associated with a prior 154 // nested-name-specifier. 155 LookupQualifiedName(Result, LookupCtx); 156 157 if (ObjectTypePtr && Result.empty()) { 158 // C++ [basic.lookup.classref]p3: 159 // If the unqualified-id is ~type-name, the type-name is looked up 160 // in the context of the entire postfix-expression. If the type T of 161 // the object expression is of a class type C, the type-name is also 162 // looked up in the scope of class C. At least one of the lookups shall 163 // find a name that refers to (possibly cv-qualified) T. 164 LookupName(Result, S); 165 } 166 } else { 167 // Perform unqualified name lookup. 168 LookupName(Result, S); 169 } 170 171 NamedDecl *IIDecl = 0; 172 switch (Result.getResultKind()) { 173 case LookupResult::NotFound: 174 case LookupResult::NotFoundInCurrentInstantiation: 175 if (CorrectedII) { 176 TypeNameValidatorCCC Validator(true); 177 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), 178 Kind, S, SS, Validator); 179 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); 180 TemplateTy Template; 181 bool MemberOfUnknownSpecialization; 182 UnqualifiedId TemplateName; 183 TemplateName.setIdentifier(NewII, NameLoc); 184 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); 185 CXXScopeSpec NewSS, *NewSSPtr = SS; 186 if (SS && NNS) { 187 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); 188 NewSSPtr = &NewSS; 189 } 190 if (Correction && (NNS || NewII != &II) && 191 // Ignore a correction to a template type as the to-be-corrected 192 // identifier is not a template (typo correction for template names 193 // is handled elsewhere). 194 !(getLangOptions().CPlusPlus && NewSSPtr && 195 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(), 196 false, Template, MemberOfUnknownSpecialization))) { 197 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, 198 isClassName, HasTrailingDot, ObjectTypePtr, 199 IsCtorOrDtorName, 200 WantNontrivialTypeSourceInfo); 201 if (Ty) { 202 std::string CorrectedStr(Correction.getAsString(getLangOptions())); 203 std::string CorrectedQuotedStr( 204 Correction.getQuoted(getLangOptions())); 205 Diag(NameLoc, diag::err_unknown_typename_suggest) 206 << Result.getLookupName() << CorrectedQuotedStr 207 << FixItHint::CreateReplacement(SourceRange(NameLoc), 208 CorrectedStr); 209 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl()) 210 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 211 << CorrectedQuotedStr; 212 213 if (SS && NNS) 214 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); 215 *CorrectedII = NewII; 216 return Ty; 217 } 218 } 219 } 220 // If typo correction failed or was not performed, fall through 221 case LookupResult::FoundOverloaded: 222 case LookupResult::FoundUnresolvedValue: 223 Result.suppressDiagnostics(); 224 return ParsedType(); 225 226 case LookupResult::Ambiguous: 227 // Recover from type-hiding ambiguities by hiding the type. We'll 228 // do the lookup again when looking for an object, and we can 229 // diagnose the error then. If we don't do this, then the error 230 // about hiding the type will be immediately followed by an error 231 // that only makes sense if the identifier was treated like a type. 232 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 233 Result.suppressDiagnostics(); 234 return ParsedType(); 235 } 236 237 // Look to see if we have a type anywhere in the list of results. 238 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 239 Res != ResEnd; ++Res) { 240 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 241 if (!IIDecl || 242 (*Res)->getLocation().getRawEncoding() < 243 IIDecl->getLocation().getRawEncoding()) 244 IIDecl = *Res; 245 } 246 } 247 248 if (!IIDecl) { 249 // None of the entities we found is a type, so there is no way 250 // to even assume that the result is a type. In this case, don't 251 // complain about the ambiguity. The parser will either try to 252 // perform this lookup again (e.g., as an object name), which 253 // will produce the ambiguity, or will complain that it expected 254 // a type name. 255 Result.suppressDiagnostics(); 256 return ParsedType(); 257 } 258 259 // We found a type within the ambiguous lookup; diagnose the 260 // ambiguity and then return that type. This might be the right 261 // answer, or it might not be, but it suppresses any attempt to 262 // perform the name lookup again. 263 break; 264 265 case LookupResult::Found: 266 IIDecl = Result.getFoundDecl(); 267 break; 268 } 269 270 assert(IIDecl && "Didn't find decl"); 271 272 QualType T; 273 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 274 DiagnoseUseOfDecl(IIDecl, NameLoc); 275 276 if (T.isNull()) 277 T = Context.getTypeDeclType(TD); 278 279 // NOTE: avoid constructing an ElaboratedType(Loc) if this is a 280 // constructor or destructor name (in such a case, the scope specifier 281 // will be attached to the enclosing Expr or Decl node). 282 if (SS && SS->isNotEmpty() && !IsCtorOrDtorName) { 283 if (WantNontrivialTypeSourceInfo) { 284 // Construct a type with type-source information. 285 TypeLocBuilder Builder; 286 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 287 288 T = getElaboratedType(ETK_None, *SS, T); 289 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 290 ElabTL.setKeywordLoc(SourceLocation()); 291 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 292 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 293 } else { 294 T = getElaboratedType(ETK_None, *SS, T); 295 } 296 } 297 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 298 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 299 if (!HasTrailingDot) 300 T = Context.getObjCInterfaceType(IDecl); 301 } 302 303 if (T.isNull()) { 304 // If it's not plausibly a type, suppress diagnostics. 305 Result.suppressDiagnostics(); 306 return ParsedType(); 307 } 308 return ParsedType::make(T); 309} 310 311/// isTagName() - This method is called *for error recovery purposes only* 312/// to determine if the specified name is a valid tag name ("struct foo"). If 313/// so, this returns the TST for the tag corresponding to it (TST_enum, 314/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 315/// where the user forgot to specify the tag. 316DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 317 // Do a tag name lookup in this scope. 318 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 319 LookupName(R, S, false); 320 R.suppressDiagnostics(); 321 if (R.getResultKind() == LookupResult::Found) 322 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 323 switch (TD->getTagKind()) { 324 case TTK_Struct: return DeclSpec::TST_struct; 325 case TTK_Union: return DeclSpec::TST_union; 326 case TTK_Class: return DeclSpec::TST_class; 327 case TTK_Enum: return DeclSpec::TST_enum; 328 } 329 } 330 331 return DeclSpec::TST_unspecified; 332} 333 334/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 335/// if a CXXScopeSpec's type is equal to the type of one of the base classes 336/// then downgrade the missing typename error to a warning. 337/// This is needed for MSVC compatibility; Example: 338/// @code 339/// template<class T> class A { 340/// public: 341/// typedef int TYPE; 342/// }; 343/// template<class T> class B : public A<T> { 344/// public: 345/// A<T>::TYPE a; // no typename required because A<T> is a base class. 346/// }; 347/// @endcode 348bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 349 if (CurContext->isRecord()) { 350 const Type *Ty = SS->getScopeRep()->getAsType(); 351 352 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 353 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 354 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 355 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 356 return true; 357 return S->isFunctionPrototypeScope(); 358 } 359 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 360} 361 362bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 363 SourceLocation IILoc, 364 Scope *S, 365 CXXScopeSpec *SS, 366 ParsedType &SuggestedType) { 367 // We don't have anything to suggest (yet). 368 SuggestedType = ParsedType(); 369 370 // There may have been a typo in the name of the type. Look up typo 371 // results, in case we have something that we can suggest. 372 TypeNameValidatorCCC Validator(false); 373 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 374 LookupOrdinaryName, S, SS, 375 Validator)) { 376 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 377 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 378 379 if (Corrected.isKeyword()) { 380 // We corrected to a keyword. 381 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 382 Diag(IILoc, diag::err_unknown_typename_suggest) 383 << &II << CorrectedQuotedStr; 384 } else { 385 NamedDecl *Result = Corrected.getCorrectionDecl(); 386 // We found a similarly-named type or interface; suggest that. 387 if (!SS || !SS->isSet()) 388 Diag(IILoc, diag::err_unknown_typename_suggest) 389 << &II << CorrectedQuotedStr 390 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 391 else if (DeclContext *DC = computeDeclContext(*SS, false)) 392 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 393 << &II << DC << CorrectedQuotedStr << SS->getRange() 394 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 395 else 396 llvm_unreachable("could not have corrected a typo here"); 397 398 Diag(Result->getLocation(), diag::note_previous_decl) 399 << CorrectedQuotedStr; 400 401 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 402 false, false, ParsedType(), 403 /*IsCtorOrDtorName=*/false, 404 /*NonTrivialTypeSourceInfo=*/true); 405 } 406 return true; 407 } 408 409 if (getLangOptions().CPlusPlus) { 410 // See if II is a class template that the user forgot to pass arguments to. 411 UnqualifiedId Name; 412 Name.setIdentifier(&II, IILoc); 413 CXXScopeSpec EmptySS; 414 TemplateTy TemplateResult; 415 bool MemberOfUnknownSpecialization; 416 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 417 Name, ParsedType(), true, TemplateResult, 418 MemberOfUnknownSpecialization) == TNK_Type_template) { 419 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 420 Diag(IILoc, diag::err_template_missing_args) << TplName; 421 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 422 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 423 << TplDecl->getTemplateParameters()->getSourceRange(); 424 } 425 return true; 426 } 427 } 428 429 // FIXME: Should we move the logic that tries to recover from a missing tag 430 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 431 432 if (!SS || (!SS->isSet() && !SS->isInvalid())) 433 Diag(IILoc, diag::err_unknown_typename) << &II; 434 else if (DeclContext *DC = computeDeclContext(*SS, false)) 435 Diag(IILoc, diag::err_typename_nested_not_found) 436 << &II << DC << SS->getRange(); 437 else if (isDependentScopeSpecifier(*SS)) { 438 unsigned DiagID = diag::err_typename_missing; 439 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS, S)) 440 DiagID = diag::warn_typename_missing; 441 442 Diag(SS->getRange().getBegin(), DiagID) 443 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 444 << SourceRange(SS->getRange().getBegin(), IILoc) 445 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 446 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc) 447 .get(); 448 } else { 449 assert(SS && SS->isInvalid() && 450 "Invalid scope specifier has already been diagnosed"); 451 } 452 453 return true; 454} 455 456/// \brief Determine whether the given result set contains either a type name 457/// or 458static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 459 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 460 NextToken.is(tok::less); 461 462 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 463 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 464 return true; 465 466 if (CheckTemplate && isa<TemplateDecl>(*I)) 467 return true; 468 } 469 470 return false; 471} 472 473Sema::NameClassification Sema::ClassifyName(Scope *S, 474 CXXScopeSpec &SS, 475 IdentifierInfo *&Name, 476 SourceLocation NameLoc, 477 const Token &NextToken) { 478 DeclarationNameInfo NameInfo(Name, NameLoc); 479 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 480 481 if (NextToken.is(tok::coloncolon)) { 482 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 483 QualType(), false, SS, 0, false); 484 485 } 486 487 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 488 LookupParsedName(Result, S, &SS, !CurMethod); 489 490 // Perform lookup for Objective-C instance variables (including automatically 491 // synthesized instance variables), if we're in an Objective-C method. 492 // FIXME: This lookup really, really needs to be folded in to the normal 493 // unqualified lookup mechanism. 494 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 495 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 496 if (E.get() || E.isInvalid()) 497 return E; 498 } 499 500 bool SecondTry = false; 501 bool IsFilteredTemplateName = false; 502 503Corrected: 504 switch (Result.getResultKind()) { 505 case LookupResult::NotFound: 506 // If an unqualified-id is followed by a '(', then we have a function 507 // call. 508 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 509 // In C++, this is an ADL-only call. 510 // FIXME: Reference? 511 if (getLangOptions().CPlusPlus) 512 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 513 514 // C90 6.3.2.2: 515 // If the expression that precedes the parenthesized argument list in a 516 // function call consists solely of an identifier, and if no 517 // declaration is visible for this identifier, the identifier is 518 // implicitly declared exactly as if, in the innermost block containing 519 // the function call, the declaration 520 // 521 // extern int identifier (); 522 // 523 // appeared. 524 // 525 // We also allow this in C99 as an extension. 526 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 527 Result.addDecl(D); 528 Result.resolveKind(); 529 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 530 } 531 } 532 533 // In C, we first see whether there is a tag type by the same name, in 534 // which case it's likely that the user just forget to write "enum", 535 // "struct", or "union". 536 if (!getLangOptions().CPlusPlus && !SecondTry) { 537 Result.clear(LookupTagName); 538 LookupParsedName(Result, S, &SS); 539 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 540 const char *TagName = 0; 541 const char *FixItTagName = 0; 542 switch (Tag->getTagKind()) { 543 case TTK_Class: 544 TagName = "class"; 545 FixItTagName = "class "; 546 break; 547 548 case TTK_Enum: 549 TagName = "enum"; 550 FixItTagName = "enum "; 551 break; 552 553 case TTK_Struct: 554 TagName = "struct"; 555 FixItTagName = "struct "; 556 break; 557 558 case TTK_Union: 559 TagName = "union"; 560 FixItTagName = "union "; 561 break; 562 } 563 564 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 565 << Name << TagName << getLangOptions().CPlusPlus 566 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 567 break; 568 } 569 570 Result.clear(LookupOrdinaryName); 571 } 572 573 // Perform typo correction to determine if there is another name that is 574 // close to this name. 575 if (!SecondTry) { 576 SecondTry = true; 577 CorrectionCandidateCallback DefaultValidator; 578 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 579 Result.getLookupKind(), S, 580 &SS, DefaultValidator)) { 581 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 582 unsigned QualifiedDiag = diag::err_no_member_suggest; 583 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 584 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 585 586 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 587 NamedDecl *UnderlyingFirstDecl 588 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 589 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 590 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 591 UnqualifiedDiag = diag::err_no_template_suggest; 592 QualifiedDiag = diag::err_no_member_template_suggest; 593 } else if (UnderlyingFirstDecl && 594 (isa<TypeDecl>(UnderlyingFirstDecl) || 595 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 596 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 597 UnqualifiedDiag = diag::err_unknown_typename_suggest; 598 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 599 } 600 601 if (SS.isEmpty()) 602 Diag(NameLoc, UnqualifiedDiag) 603 << Name << CorrectedQuotedStr 604 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 605 else 606 Diag(NameLoc, QualifiedDiag) 607 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 608 << SS.getRange() 609 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 610 611 // Update the name, so that the caller has the new name. 612 Name = Corrected.getCorrectionAsIdentifierInfo(); 613 614 // Typo correction corrected to a keyword. 615 if (Corrected.isKeyword()) 616 return Corrected.getCorrectionAsIdentifierInfo(); 617 618 // Also update the LookupResult... 619 // FIXME: This should probably go away at some point 620 Result.clear(); 621 Result.setLookupName(Corrected.getCorrection()); 622 if (FirstDecl) { 623 Result.addDecl(FirstDecl); 624 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 625 << CorrectedQuotedStr; 626 } 627 628 // If we found an Objective-C instance variable, let 629 // LookupInObjCMethod build the appropriate expression to 630 // reference the ivar. 631 // FIXME: This is a gross hack. 632 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 633 Result.clear(); 634 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 635 return move(E); 636 } 637 638 goto Corrected; 639 } 640 } 641 642 // We failed to correct; just fall through and let the parser deal with it. 643 Result.suppressDiagnostics(); 644 return NameClassification::Unknown(); 645 646 case LookupResult::NotFoundInCurrentInstantiation: { 647 // We performed name lookup into the current instantiation, and there were 648 // dependent bases, so we treat this result the same way as any other 649 // dependent nested-name-specifier. 650 651 // C++ [temp.res]p2: 652 // A name used in a template declaration or definition and that is 653 // dependent on a template-parameter is assumed not to name a type 654 // unless the applicable name lookup finds a type name or the name is 655 // qualified by the keyword typename. 656 // 657 // FIXME: If the next token is '<', we might want to ask the parser to 658 // perform some heroics to see if we actually have a 659 // template-argument-list, which would indicate a missing 'template' 660 // keyword here. 661 return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(), 662 NameInfo, /*TemplateArgs=*/0); 663 } 664 665 case LookupResult::Found: 666 case LookupResult::FoundOverloaded: 667 case LookupResult::FoundUnresolvedValue: 668 break; 669 670 case LookupResult::Ambiguous: 671 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 672 hasAnyAcceptableTemplateNames(Result)) { 673 // C++ [temp.local]p3: 674 // A lookup that finds an injected-class-name (10.2) can result in an 675 // ambiguity in certain cases (for example, if it is found in more than 676 // one base class). If all of the injected-class-names that are found 677 // refer to specializations of the same class template, and if the name 678 // is followed by a template-argument-list, the reference refers to the 679 // class template itself and not a specialization thereof, and is not 680 // ambiguous. 681 // 682 // This filtering can make an ambiguous result into an unambiguous one, 683 // so try again after filtering out template names. 684 FilterAcceptableTemplateNames(Result); 685 if (!Result.isAmbiguous()) { 686 IsFilteredTemplateName = true; 687 break; 688 } 689 } 690 691 // Diagnose the ambiguity and return an error. 692 return NameClassification::Error(); 693 } 694 695 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 696 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 697 // C++ [temp.names]p3: 698 // After name lookup (3.4) finds that a name is a template-name or that 699 // an operator-function-id or a literal- operator-id refers to a set of 700 // overloaded functions any member of which is a function template if 701 // this is followed by a <, the < is always taken as the delimiter of a 702 // template-argument-list and never as the less-than operator. 703 if (!IsFilteredTemplateName) 704 FilterAcceptableTemplateNames(Result); 705 706 if (!Result.empty()) { 707 bool IsFunctionTemplate; 708 TemplateName Template; 709 if (Result.end() - Result.begin() > 1) { 710 IsFunctionTemplate = true; 711 Template = Context.getOverloadedTemplateName(Result.begin(), 712 Result.end()); 713 } else { 714 TemplateDecl *TD 715 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 716 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 717 718 if (SS.isSet() && !SS.isInvalid()) 719 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 720 /*TemplateKeyword=*/false, 721 TD); 722 else 723 Template = TemplateName(TD); 724 } 725 726 if (IsFunctionTemplate) { 727 // Function templates always go through overload resolution, at which 728 // point we'll perform the various checks (e.g., accessibility) we need 729 // to based on which function we selected. 730 Result.suppressDiagnostics(); 731 732 return NameClassification::FunctionTemplate(Template); 733 } 734 735 return NameClassification::TypeTemplate(Template); 736 } 737 } 738 739 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 740 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 741 DiagnoseUseOfDecl(Type, NameLoc); 742 QualType T = Context.getTypeDeclType(Type); 743 return ParsedType::make(T); 744 } 745 746 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 747 if (!Class) { 748 // FIXME: It's unfortunate that we don't have a Type node for handling this. 749 if (ObjCCompatibleAliasDecl *Alias 750 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 751 Class = Alias->getClassInterface(); 752 } 753 754 if (Class) { 755 DiagnoseUseOfDecl(Class, NameLoc); 756 757 if (NextToken.is(tok::period)) { 758 // Interface. <something> is parsed as a property reference expression. 759 // Just return "unknown" as a fall-through for now. 760 Result.suppressDiagnostics(); 761 return NameClassification::Unknown(); 762 } 763 764 QualType T = Context.getObjCInterfaceType(Class); 765 return ParsedType::make(T); 766 } 767 768 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 769 return BuildPossibleImplicitMemberExpr(SS, SourceLocation(), Result, 0); 770 771 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 772 return BuildDeclarationNameExpr(SS, Result, ADL); 773} 774 775// Determines the context to return to after temporarily entering a 776// context. This depends in an unnecessarily complicated way on the 777// exact ordering of callbacks from the parser. 778DeclContext *Sema::getContainingDC(DeclContext *DC) { 779 780 // Functions defined inline within classes aren't parsed until we've 781 // finished parsing the top-level class, so the top-level class is 782 // the context we'll need to return to. 783 if (isa<FunctionDecl>(DC)) { 784 DC = DC->getLexicalParent(); 785 786 // A function not defined within a class will always return to its 787 // lexical context. 788 if (!isa<CXXRecordDecl>(DC)) 789 return DC; 790 791 // A C++ inline method/friend is parsed *after* the topmost class 792 // it was declared in is fully parsed ("complete"); the topmost 793 // class is the context we need to return to. 794 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 795 DC = RD; 796 797 // Return the declaration context of the topmost class the inline method is 798 // declared in. 799 return DC; 800 } 801 802 return DC->getLexicalParent(); 803} 804 805void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 806 assert(getContainingDC(DC) == CurContext && 807 "The next DeclContext should be lexically contained in the current one."); 808 CurContext = DC; 809 S->setEntity(DC); 810} 811 812void Sema::PopDeclContext() { 813 assert(CurContext && "DeclContext imbalance!"); 814 815 CurContext = getContainingDC(CurContext); 816 assert(CurContext && "Popped translation unit!"); 817} 818 819/// EnterDeclaratorContext - Used when we must lookup names in the context 820/// of a declarator's nested name specifier. 821/// 822void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 823 // C++0x [basic.lookup.unqual]p13: 824 // A name used in the definition of a static data member of class 825 // X (after the qualified-id of the static member) is looked up as 826 // if the name was used in a member function of X. 827 // C++0x [basic.lookup.unqual]p14: 828 // If a variable member of a namespace is defined outside of the 829 // scope of its namespace then any name used in the definition of 830 // the variable member (after the declarator-id) is looked up as 831 // if the definition of the variable member occurred in its 832 // namespace. 833 // Both of these imply that we should push a scope whose context 834 // is the semantic context of the declaration. We can't use 835 // PushDeclContext here because that context is not necessarily 836 // lexically contained in the current context. Fortunately, 837 // the containing scope should have the appropriate information. 838 839 assert(!S->getEntity() && "scope already has entity"); 840 841#ifndef NDEBUG 842 Scope *Ancestor = S->getParent(); 843 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 844 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 845#endif 846 847 CurContext = DC; 848 S->setEntity(DC); 849} 850 851void Sema::ExitDeclaratorContext(Scope *S) { 852 assert(S->getEntity() == CurContext && "Context imbalance!"); 853 854 // Switch back to the lexical context. The safety of this is 855 // enforced by an assert in EnterDeclaratorContext. 856 Scope *Ancestor = S->getParent(); 857 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 858 CurContext = (DeclContext*) Ancestor->getEntity(); 859 860 // We don't need to do anything with the scope, which is going to 861 // disappear. 862} 863 864 865void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 866 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 867 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 868 // We assume that the caller has already called 869 // ActOnReenterTemplateScope 870 FD = TFD->getTemplatedDecl(); 871 } 872 if (!FD) 873 return; 874 875 PushDeclContext(S, FD); 876 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 877 ParmVarDecl *Param = FD->getParamDecl(P); 878 // If the parameter has an identifier, then add it to the scope 879 if (Param->getIdentifier()) { 880 S->AddDecl(Param); 881 IdResolver.AddDecl(Param); 882 } 883 } 884} 885 886 887/// \brief Determine whether we allow overloading of the function 888/// PrevDecl with another declaration. 889/// 890/// This routine determines whether overloading is possible, not 891/// whether some new function is actually an overload. It will return 892/// true in C++ (where we can always provide overloads) or, as an 893/// extension, in C when the previous function is already an 894/// overloaded function declaration or has the "overloadable" 895/// attribute. 896static bool AllowOverloadingOfFunction(LookupResult &Previous, 897 ASTContext &Context) { 898 if (Context.getLangOptions().CPlusPlus) 899 return true; 900 901 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 902 return true; 903 904 return (Previous.getResultKind() == LookupResult::Found 905 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 906} 907 908/// Add this decl to the scope shadowed decl chains. 909void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 910 // Move up the scope chain until we find the nearest enclosing 911 // non-transparent context. The declaration will be introduced into this 912 // scope. 913 while (S->getEntity() && 914 ((DeclContext *)S->getEntity())->isTransparentContext()) 915 S = S->getParent(); 916 917 // Add scoped declarations into their context, so that they can be 918 // found later. Declarations without a context won't be inserted 919 // into any context. 920 if (AddToContext) 921 CurContext->addDecl(D); 922 923 // Out-of-line definitions shouldn't be pushed into scope in C++. 924 // Out-of-line variable and function definitions shouldn't even in C. 925 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 926 D->isOutOfLine() && 927 !D->getDeclContext()->getRedeclContext()->Equals( 928 D->getLexicalDeclContext()->getRedeclContext())) 929 return; 930 931 // Template instantiations should also not be pushed into scope. 932 if (isa<FunctionDecl>(D) && 933 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 934 return; 935 936 // If this replaces anything in the current scope, 937 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 938 IEnd = IdResolver.end(); 939 for (; I != IEnd; ++I) { 940 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 941 S->RemoveDecl(*I); 942 IdResolver.RemoveDecl(*I); 943 944 // Should only need to replace one decl. 945 break; 946 } 947 } 948 949 S->AddDecl(D); 950 951 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 952 // Implicitly-generated labels may end up getting generated in an order that 953 // isn't strictly lexical, which breaks name lookup. Be careful to insert 954 // the label at the appropriate place in the identifier chain. 955 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 956 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 957 if (IDC == CurContext) { 958 if (!S->isDeclScope(*I)) 959 continue; 960 } else if (IDC->Encloses(CurContext)) 961 break; 962 } 963 964 IdResolver.InsertDeclAfter(I, D); 965 } else { 966 IdResolver.AddDecl(D); 967 } 968} 969 970void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) { 971 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope) 972 TUScope->AddDecl(D); 973} 974 975bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 976 bool ExplicitInstantiationOrSpecialization) { 977 return IdResolver.isDeclInScope(D, Ctx, Context, S, 978 ExplicitInstantiationOrSpecialization); 979} 980 981Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 982 DeclContext *TargetDC = DC->getPrimaryContext(); 983 do { 984 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 985 if (ScopeDC->getPrimaryContext() == TargetDC) 986 return S; 987 } while ((S = S->getParent())); 988 989 return 0; 990} 991 992static bool isOutOfScopePreviousDeclaration(NamedDecl *, 993 DeclContext*, 994 ASTContext&); 995 996/// Filters out lookup results that don't fall within the given scope 997/// as determined by isDeclInScope. 998void Sema::FilterLookupForScope(LookupResult &R, 999 DeclContext *Ctx, Scope *S, 1000 bool ConsiderLinkage, 1001 bool ExplicitInstantiationOrSpecialization) { 1002 LookupResult::Filter F = R.makeFilter(); 1003 while (F.hasNext()) { 1004 NamedDecl *D = F.next(); 1005 1006 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 1007 continue; 1008 1009 if (ConsiderLinkage && 1010 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 1011 continue; 1012 1013 F.erase(); 1014 } 1015 1016 F.done(); 1017} 1018 1019static bool isUsingDecl(NamedDecl *D) { 1020 return isa<UsingShadowDecl>(D) || 1021 isa<UnresolvedUsingTypenameDecl>(D) || 1022 isa<UnresolvedUsingValueDecl>(D); 1023} 1024 1025/// Removes using shadow declarations from the lookup results. 1026static void RemoveUsingDecls(LookupResult &R) { 1027 LookupResult::Filter F = R.makeFilter(); 1028 while (F.hasNext()) 1029 if (isUsingDecl(F.next())) 1030 F.erase(); 1031 1032 F.done(); 1033} 1034 1035/// \brief Check for this common pattern: 1036/// @code 1037/// class S { 1038/// S(const S&); // DO NOT IMPLEMENT 1039/// void operator=(const S&); // DO NOT IMPLEMENT 1040/// }; 1041/// @endcode 1042static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1043 // FIXME: Should check for private access too but access is set after we get 1044 // the decl here. 1045 if (D->doesThisDeclarationHaveABody()) 1046 return false; 1047 1048 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1049 return CD->isCopyConstructor(); 1050 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1051 return Method->isCopyAssignmentOperator(); 1052 return false; 1053} 1054 1055bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1056 assert(D); 1057 1058 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1059 return false; 1060 1061 // Ignore class templates. 1062 if (D->getDeclContext()->isDependentContext() || 1063 D->getLexicalDeclContext()->isDependentContext()) 1064 return false; 1065 1066 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1067 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1068 return false; 1069 1070 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1071 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1072 return false; 1073 } else { 1074 // 'static inline' functions are used in headers; don't warn. 1075 if (FD->getStorageClass() == SC_Static && 1076 FD->isInlineSpecified()) 1077 return false; 1078 } 1079 1080 if (FD->doesThisDeclarationHaveABody() && 1081 Context.DeclMustBeEmitted(FD)) 1082 return false; 1083 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1084 if (!VD->isFileVarDecl() || 1085 VD->getType().isConstant(Context) || 1086 Context.DeclMustBeEmitted(VD)) 1087 return false; 1088 1089 if (VD->isStaticDataMember() && 1090 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1091 return false; 1092 1093 } else { 1094 return false; 1095 } 1096 1097 // Only warn for unused decls internal to the translation unit. 1098 if (D->getLinkage() == ExternalLinkage) 1099 return false; 1100 1101 return true; 1102} 1103 1104void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1105 if (!D) 1106 return; 1107 1108 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1109 const FunctionDecl *First = FD->getFirstDeclaration(); 1110 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1111 return; // First should already be in the vector. 1112 } 1113 1114 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1115 const VarDecl *First = VD->getFirstDeclaration(); 1116 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1117 return; // First should already be in the vector. 1118 } 1119 1120 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1121 UnusedFileScopedDecls.push_back(D); 1122 } 1123 1124static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1125 if (D->isInvalidDecl()) 1126 return false; 1127 1128 if (D->isReferenced() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1129 return false; 1130 1131 if (isa<LabelDecl>(D)) 1132 return true; 1133 1134 // White-list anything that isn't a local variable. 1135 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1136 !D->getDeclContext()->isFunctionOrMethod()) 1137 return false; 1138 1139 // Types of valid local variables should be complete, so this should succeed. 1140 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1141 1142 // White-list anything with an __attribute__((unused)) type. 1143 QualType Ty = VD->getType(); 1144 1145 // Only look at the outermost level of typedef. 1146 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1147 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1148 return false; 1149 } 1150 1151 // If we failed to complete the type for some reason, or if the type is 1152 // dependent, don't diagnose the variable. 1153 if (Ty->isIncompleteType() || Ty->isDependentType()) 1154 return false; 1155 1156 if (const TagType *TT = Ty->getAs<TagType>()) { 1157 const TagDecl *Tag = TT->getDecl(); 1158 if (Tag->hasAttr<UnusedAttr>()) 1159 return false; 1160 1161 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1162 if (!RD->hasTrivialDestructor()) 1163 return false; 1164 1165 if (const Expr *Init = VD->getInit()) { 1166 const CXXConstructExpr *Construct = 1167 dyn_cast<CXXConstructExpr>(Init); 1168 if (Construct && !Construct->isElidable()) { 1169 CXXConstructorDecl *CD = Construct->getConstructor(); 1170 if (!CD->isTrivial()) 1171 return false; 1172 } 1173 } 1174 } 1175 } 1176 1177 // TODO: __attribute__((unused)) templates? 1178 } 1179 1180 return true; 1181} 1182 1183static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1184 FixItHint &Hint) { 1185 if (isa<LabelDecl>(D)) { 1186 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1187 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1188 if (AfterColon.isInvalid()) 1189 return; 1190 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1191 getCharRange(D->getLocStart(), AfterColon)); 1192 } 1193 return; 1194} 1195 1196/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1197/// unless they are marked attr(unused). 1198void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1199 FixItHint Hint; 1200 if (!ShouldDiagnoseUnusedDecl(D)) 1201 return; 1202 1203 GenerateFixForUnusedDecl(D, Context, Hint); 1204 1205 unsigned DiagID; 1206 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1207 DiagID = diag::warn_unused_exception_param; 1208 else if (isa<LabelDecl>(D)) 1209 DiagID = diag::warn_unused_label; 1210 else 1211 DiagID = diag::warn_unused_variable; 1212 1213 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1214} 1215 1216static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1217 // Verify that we have no forward references left. If so, there was a goto 1218 // or address of a label taken, but no definition of it. Label fwd 1219 // definitions are indicated with a null substmt. 1220 if (L->getStmt() == 0) 1221 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1222} 1223 1224void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1225 if (S->decl_empty()) return; 1226 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1227 "Scope shouldn't contain decls!"); 1228 1229 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1230 I != E; ++I) { 1231 Decl *TmpD = (*I); 1232 assert(TmpD && "This decl didn't get pushed??"); 1233 1234 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1235 NamedDecl *D = cast<NamedDecl>(TmpD); 1236 1237 if (!D->getDeclName()) continue; 1238 1239 // Diagnose unused variables in this scope. 1240 if (!S->hasErrorOccurred()) 1241 DiagnoseUnusedDecl(D); 1242 1243 // If this was a forward reference to a label, verify it was defined. 1244 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1245 CheckPoppedLabel(LD, *this); 1246 1247 // Remove this name from our lexical scope. 1248 IdResolver.RemoveDecl(D); 1249 } 1250} 1251 1252/// \brief Look for an Objective-C class in the translation unit. 1253/// 1254/// \param Id The name of the Objective-C class we're looking for. If 1255/// typo-correction fixes this name, the Id will be updated 1256/// to the fixed name. 1257/// 1258/// \param IdLoc The location of the name in the translation unit. 1259/// 1260/// \param TypoCorrection If true, this routine will attempt typo correction 1261/// if there is no class with the given name. 1262/// 1263/// \returns The declaration of the named Objective-C class, or NULL if the 1264/// class could not be found. 1265ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1266 SourceLocation IdLoc, 1267 bool DoTypoCorrection) { 1268 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1269 // creation from this context. 1270 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1271 1272 if (!IDecl && DoTypoCorrection) { 1273 // Perform typo correction at the given location, but only if we 1274 // find an Objective-C class name. 1275 DeclFilterCCC<ObjCInterfaceDecl> Validator; 1276 if (TypoCorrection C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), 1277 LookupOrdinaryName, TUScope, NULL, 1278 Validator)) { 1279 IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>(); 1280 Diag(IdLoc, diag::err_undef_interface_suggest) 1281 << Id << IDecl->getDeclName() 1282 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1283 Diag(IDecl->getLocation(), diag::note_previous_decl) 1284 << IDecl->getDeclName(); 1285 1286 Id = IDecl->getIdentifier(); 1287 } 1288 } 1289 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1290 // This routine must always return a class definition, if any. 1291 if (Def && Def->getDefinition()) 1292 Def = Def->getDefinition(); 1293 return Def; 1294} 1295 1296/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1297/// from S, where a non-field would be declared. This routine copes 1298/// with the difference between C and C++ scoping rules in structs and 1299/// unions. For example, the following code is well-formed in C but 1300/// ill-formed in C++: 1301/// @code 1302/// struct S6 { 1303/// enum { BAR } e; 1304/// }; 1305/// 1306/// void test_S6() { 1307/// struct S6 a; 1308/// a.e = BAR; 1309/// } 1310/// @endcode 1311/// For the declaration of BAR, this routine will return a different 1312/// scope. The scope S will be the scope of the unnamed enumeration 1313/// within S6. In C++, this routine will return the scope associated 1314/// with S6, because the enumeration's scope is a transparent 1315/// context but structures can contain non-field names. In C, this 1316/// routine will return the translation unit scope, since the 1317/// enumeration's scope is a transparent context and structures cannot 1318/// contain non-field names. 1319Scope *Sema::getNonFieldDeclScope(Scope *S) { 1320 while (((S->getFlags() & Scope::DeclScope) == 0) || 1321 (S->getEntity() && 1322 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1323 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1324 S = S->getParent(); 1325 return S; 1326} 1327 1328/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1329/// file scope. lazily create a decl for it. ForRedeclaration is true 1330/// if we're creating this built-in in anticipation of redeclaring the 1331/// built-in. 1332NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1333 Scope *S, bool ForRedeclaration, 1334 SourceLocation Loc) { 1335 Builtin::ID BID = (Builtin::ID)bid; 1336 1337 ASTContext::GetBuiltinTypeError Error; 1338 QualType R = Context.GetBuiltinType(BID, Error); 1339 switch (Error) { 1340 case ASTContext::GE_None: 1341 // Okay 1342 break; 1343 1344 case ASTContext::GE_Missing_stdio: 1345 if (ForRedeclaration) 1346 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1347 << Context.BuiltinInfo.GetName(BID); 1348 return 0; 1349 1350 case ASTContext::GE_Missing_setjmp: 1351 if (ForRedeclaration) 1352 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1353 << Context.BuiltinInfo.GetName(BID); 1354 return 0; 1355 1356 case ASTContext::GE_Missing_ucontext: 1357 if (ForRedeclaration) 1358 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1359 << Context.BuiltinInfo.GetName(BID); 1360 return 0; 1361 } 1362 1363 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1364 Diag(Loc, diag::ext_implicit_lib_function_decl) 1365 << Context.BuiltinInfo.GetName(BID) 1366 << R; 1367 if (Context.BuiltinInfo.getHeaderName(BID) && 1368 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1369 != DiagnosticsEngine::Ignored) 1370 Diag(Loc, diag::note_please_include_header) 1371 << Context.BuiltinInfo.getHeaderName(BID) 1372 << Context.BuiltinInfo.GetName(BID); 1373 } 1374 1375 FunctionDecl *New = FunctionDecl::Create(Context, 1376 Context.getTranslationUnitDecl(), 1377 Loc, Loc, II, R, /*TInfo=*/0, 1378 SC_Extern, 1379 SC_None, false, 1380 /*hasPrototype=*/true); 1381 New->setImplicit(); 1382 1383 // Create Decl objects for each parameter, adding them to the 1384 // FunctionDecl. 1385 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1386 SmallVector<ParmVarDecl*, 16> Params; 1387 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1388 ParmVarDecl *parm = 1389 ParmVarDecl::Create(Context, New, SourceLocation(), 1390 SourceLocation(), 0, 1391 FT->getArgType(i), /*TInfo=*/0, 1392 SC_None, SC_None, 0); 1393 parm->setScopeInfo(0, i); 1394 Params.push_back(parm); 1395 } 1396 New->setParams(Params); 1397 } 1398 1399 AddKnownFunctionAttributes(New); 1400 1401 // TUScope is the translation-unit scope to insert this function into. 1402 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1403 // relate Scopes to DeclContexts, and probably eliminate CurContext 1404 // entirely, but we're not there yet. 1405 DeclContext *SavedContext = CurContext; 1406 CurContext = Context.getTranslationUnitDecl(); 1407 PushOnScopeChains(New, TUScope); 1408 CurContext = SavedContext; 1409 return New; 1410} 1411 1412bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { 1413 QualType OldType; 1414 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1415 OldType = OldTypedef->getUnderlyingType(); 1416 else 1417 OldType = Context.getTypeDeclType(Old); 1418 QualType NewType = New->getUnderlyingType(); 1419 1420 if (NewType->isVariablyModifiedType()) { 1421 // Must not redefine a typedef with a variably-modified type. 1422 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1423 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef) 1424 << Kind << NewType; 1425 if (Old->getLocation().isValid()) 1426 Diag(Old->getLocation(), diag::note_previous_definition); 1427 New->setInvalidDecl(); 1428 return true; 1429 } 1430 1431 if (OldType != NewType && 1432 !OldType->isDependentType() && 1433 !NewType->isDependentType() && 1434 !Context.hasSameType(OldType, NewType)) { 1435 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1436 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1437 << Kind << NewType << OldType; 1438 if (Old->getLocation().isValid()) 1439 Diag(Old->getLocation(), diag::note_previous_definition); 1440 New->setInvalidDecl(); 1441 return true; 1442 } 1443 return false; 1444} 1445 1446/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1447/// same name and scope as a previous declaration 'Old'. Figure out 1448/// how to resolve this situation, merging decls or emitting 1449/// diagnostics as appropriate. If there was an error, set New to be invalid. 1450/// 1451void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1452 // If the new decl is known invalid already, don't bother doing any 1453 // merging checks. 1454 if (New->isInvalidDecl()) return; 1455 1456 // Allow multiple definitions for ObjC built-in typedefs. 1457 // FIXME: Verify the underlying types are equivalent! 1458 if (getLangOptions().ObjC1) { 1459 const IdentifierInfo *TypeID = New->getIdentifier(); 1460 switch (TypeID->getLength()) { 1461 default: break; 1462 case 2: 1463 if (!TypeID->isStr("id")) 1464 break; 1465 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1466 // Install the built-in type for 'id', ignoring the current definition. 1467 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1468 return; 1469 case 5: 1470 if (!TypeID->isStr("Class")) 1471 break; 1472 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1473 // Install the built-in type for 'Class', ignoring the current definition. 1474 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1475 return; 1476 case 3: 1477 if (!TypeID->isStr("SEL")) 1478 break; 1479 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1480 // Install the built-in type for 'SEL', ignoring the current definition. 1481 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1482 return; 1483 } 1484 // Fall through - the typedef name was not a builtin type. 1485 } 1486 1487 // Verify the old decl was also a type. 1488 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1489 if (!Old) { 1490 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1491 << New->getDeclName(); 1492 1493 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1494 if (OldD->getLocation().isValid()) 1495 Diag(OldD->getLocation(), diag::note_previous_definition); 1496 1497 return New->setInvalidDecl(); 1498 } 1499 1500 // If the old declaration is invalid, just give up here. 1501 if (Old->isInvalidDecl()) 1502 return New->setInvalidDecl(); 1503 1504 // If the typedef types are not identical, reject them in all languages and 1505 // with any extensions enabled. 1506 if (isIncompatibleTypedef(Old, New)) 1507 return; 1508 1509 // The types match. Link up the redeclaration chain if the old 1510 // declaration was a typedef. 1511 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1512 New->setPreviousDeclaration(Typedef); 1513 1514 if (getLangOptions().MicrosoftExt) 1515 return; 1516 1517 if (getLangOptions().CPlusPlus) { 1518 // C++ [dcl.typedef]p2: 1519 // In a given non-class scope, a typedef specifier can be used to 1520 // redefine the name of any type declared in that scope to refer 1521 // to the type to which it already refers. 1522 if (!isa<CXXRecordDecl>(CurContext)) 1523 return; 1524 1525 // C++0x [dcl.typedef]p4: 1526 // In a given class scope, a typedef specifier can be used to redefine 1527 // any class-name declared in that scope that is not also a typedef-name 1528 // to refer to the type to which it already refers. 1529 // 1530 // This wording came in via DR424, which was a correction to the 1531 // wording in DR56, which accidentally banned code like: 1532 // 1533 // struct S { 1534 // typedef struct A { } A; 1535 // }; 1536 // 1537 // in the C++03 standard. We implement the C++0x semantics, which 1538 // allow the above but disallow 1539 // 1540 // struct S { 1541 // typedef int I; 1542 // typedef int I; 1543 // }; 1544 // 1545 // since that was the intent of DR56. 1546 if (!isa<TypedefNameDecl>(Old)) 1547 return; 1548 1549 Diag(New->getLocation(), diag::err_redefinition) 1550 << New->getDeclName(); 1551 Diag(Old->getLocation(), diag::note_previous_definition); 1552 return New->setInvalidDecl(); 1553 } 1554 1555 // Modules always permit redefinition of typedefs, as does C11. 1556 if (getLangOptions().Modules || getLangOptions().C11) 1557 return; 1558 1559 // If we have a redefinition of a typedef in C, emit a warning. This warning 1560 // is normally mapped to an error, but can be controlled with 1561 // -Wtypedef-redefinition. If either the original or the redefinition is 1562 // in a system header, don't emit this for compatibility with GCC. 1563 if (getDiagnostics().getSuppressSystemWarnings() && 1564 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1565 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1566 return; 1567 1568 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1569 << New->getDeclName(); 1570 Diag(Old->getLocation(), diag::note_previous_definition); 1571 return; 1572} 1573 1574/// DeclhasAttr - returns true if decl Declaration already has the target 1575/// attribute. 1576static bool 1577DeclHasAttr(const Decl *D, const Attr *A) { 1578 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1579 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1580 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1581 if ((*i)->getKind() == A->getKind()) { 1582 if (Ann) { 1583 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1584 return true; 1585 continue; 1586 } 1587 // FIXME: Don't hardcode this check 1588 if (OA && isa<OwnershipAttr>(*i)) 1589 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1590 return true; 1591 } 1592 1593 return false; 1594} 1595 1596/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1597void Sema::mergeDeclAttributes(Decl *New, Decl *Old, 1598 bool MergeDeprecation) { 1599 if (!Old->hasAttrs()) 1600 return; 1601 1602 bool foundAny = New->hasAttrs(); 1603 1604 // Ensure that any moving of objects within the allocated map is done before 1605 // we process them. 1606 if (!foundAny) New->setAttrs(AttrVec()); 1607 1608 for (specific_attr_iterator<InheritableAttr> 1609 i = Old->specific_attr_begin<InheritableAttr>(), 1610 e = Old->specific_attr_end<InheritableAttr>(); 1611 i != e; ++i) { 1612 // Ignore deprecated/unavailable/availability attributes if requested. 1613 if (!MergeDeprecation && 1614 (isa<DeprecatedAttr>(*i) || 1615 isa<UnavailableAttr>(*i) || 1616 isa<AvailabilityAttr>(*i))) 1617 continue; 1618 1619 if (!DeclHasAttr(New, *i)) { 1620 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(Context)); 1621 newAttr->setInherited(true); 1622 New->addAttr(newAttr); 1623 foundAny = true; 1624 } 1625 } 1626 1627 if (!foundAny) New->dropAttrs(); 1628} 1629 1630/// mergeParamDeclAttributes - Copy attributes from the old parameter 1631/// to the new one. 1632static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1633 const ParmVarDecl *oldDecl, 1634 ASTContext &C) { 1635 if (!oldDecl->hasAttrs()) 1636 return; 1637 1638 bool foundAny = newDecl->hasAttrs(); 1639 1640 // Ensure that any moving of objects within the allocated map is 1641 // done before we process them. 1642 if (!foundAny) newDecl->setAttrs(AttrVec()); 1643 1644 for (specific_attr_iterator<InheritableParamAttr> 1645 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1646 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1647 if (!DeclHasAttr(newDecl, *i)) { 1648 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1649 newAttr->setInherited(true); 1650 newDecl->addAttr(newAttr); 1651 foundAny = true; 1652 } 1653 } 1654 1655 if (!foundAny) newDecl->dropAttrs(); 1656} 1657 1658namespace { 1659 1660/// Used in MergeFunctionDecl to keep track of function parameters in 1661/// C. 1662struct GNUCompatibleParamWarning { 1663 ParmVarDecl *OldParm; 1664 ParmVarDecl *NewParm; 1665 QualType PromotedType; 1666}; 1667 1668} 1669 1670/// getSpecialMember - get the special member enum for a method. 1671Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1672 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1673 if (Ctor->isDefaultConstructor()) 1674 return Sema::CXXDefaultConstructor; 1675 1676 if (Ctor->isCopyConstructor()) 1677 return Sema::CXXCopyConstructor; 1678 1679 if (Ctor->isMoveConstructor()) 1680 return Sema::CXXMoveConstructor; 1681 } else if (isa<CXXDestructorDecl>(MD)) { 1682 return Sema::CXXDestructor; 1683 } else if (MD->isCopyAssignmentOperator()) { 1684 return Sema::CXXCopyAssignment; 1685 } else if (MD->isMoveAssignmentOperator()) { 1686 return Sema::CXXMoveAssignment; 1687 } 1688 1689 return Sema::CXXInvalid; 1690} 1691 1692/// canRedefineFunction - checks if a function can be redefined. Currently, 1693/// only extern inline functions can be redefined, and even then only in 1694/// GNU89 mode. 1695static bool canRedefineFunction(const FunctionDecl *FD, 1696 const LangOptions& LangOpts) { 1697 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1698 !LangOpts.CPlusPlus && 1699 FD->isInlineSpecified() && 1700 FD->getStorageClass() == SC_Extern); 1701} 1702 1703/// MergeFunctionDecl - We just parsed a function 'New' from 1704/// declarator D which has the same name and scope as a previous 1705/// declaration 'Old'. Figure out how to resolve this situation, 1706/// merging decls or emitting diagnostics as appropriate. 1707/// 1708/// In C++, New and Old must be declarations that are not 1709/// overloaded. Use IsOverload to determine whether New and Old are 1710/// overloaded, and to select the Old declaration that New should be 1711/// merged with. 1712/// 1713/// Returns true if there was an error, false otherwise. 1714bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1715 // Verify the old decl was also a function. 1716 FunctionDecl *Old = 0; 1717 if (FunctionTemplateDecl *OldFunctionTemplate 1718 = dyn_cast<FunctionTemplateDecl>(OldD)) 1719 Old = OldFunctionTemplate->getTemplatedDecl(); 1720 else 1721 Old = dyn_cast<FunctionDecl>(OldD); 1722 if (!Old) { 1723 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1724 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1725 Diag(Shadow->getTargetDecl()->getLocation(), 1726 diag::note_using_decl_target); 1727 Diag(Shadow->getUsingDecl()->getLocation(), 1728 diag::note_using_decl) << 0; 1729 return true; 1730 } 1731 1732 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1733 << New->getDeclName(); 1734 Diag(OldD->getLocation(), diag::note_previous_definition); 1735 return true; 1736 } 1737 1738 // Determine whether the previous declaration was a definition, 1739 // implicit declaration, or a declaration. 1740 diag::kind PrevDiag; 1741 if (Old->isThisDeclarationADefinition()) 1742 PrevDiag = diag::note_previous_definition; 1743 else if (Old->isImplicit()) 1744 PrevDiag = diag::note_previous_implicit_declaration; 1745 else 1746 PrevDiag = diag::note_previous_declaration; 1747 1748 QualType OldQType = Context.getCanonicalType(Old->getType()); 1749 QualType NewQType = Context.getCanonicalType(New->getType()); 1750 1751 // Don't complain about this if we're in GNU89 mode and the old function 1752 // is an extern inline function. 1753 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1754 New->getStorageClass() == SC_Static && 1755 Old->getStorageClass() != SC_Static && 1756 !canRedefineFunction(Old, getLangOptions())) { 1757 if (getLangOptions().MicrosoftExt) { 1758 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1759 Diag(Old->getLocation(), PrevDiag); 1760 } else { 1761 Diag(New->getLocation(), diag::err_static_non_static) << New; 1762 Diag(Old->getLocation(), PrevDiag); 1763 return true; 1764 } 1765 } 1766 1767 // If a function is first declared with a calling convention, but is 1768 // later declared or defined without one, the second decl assumes the 1769 // calling convention of the first. 1770 // 1771 // For the new decl, we have to look at the NON-canonical type to tell the 1772 // difference between a function that really doesn't have a calling 1773 // convention and one that is declared cdecl. That's because in 1774 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1775 // because it is the default calling convention. 1776 // 1777 // Note also that we DO NOT return at this point, because we still have 1778 // other tests to run. 1779 const FunctionType *OldType = cast<FunctionType>(OldQType); 1780 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1781 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1782 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1783 bool RequiresAdjustment = false; 1784 if (OldTypeInfo.getCC() != CC_Default && 1785 NewTypeInfo.getCC() == CC_Default) { 1786 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1787 RequiresAdjustment = true; 1788 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1789 NewTypeInfo.getCC())) { 1790 // Calling conventions really aren't compatible, so complain. 1791 Diag(New->getLocation(), diag::err_cconv_change) 1792 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1793 << (OldTypeInfo.getCC() == CC_Default) 1794 << (OldTypeInfo.getCC() == CC_Default ? "" : 1795 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1796 Diag(Old->getLocation(), diag::note_previous_declaration); 1797 return true; 1798 } 1799 1800 // FIXME: diagnose the other way around? 1801 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1802 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1803 RequiresAdjustment = true; 1804 } 1805 1806 // Merge regparm attribute. 1807 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1808 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1809 if (NewTypeInfo.getHasRegParm()) { 1810 Diag(New->getLocation(), diag::err_regparm_mismatch) 1811 << NewType->getRegParmType() 1812 << OldType->getRegParmType(); 1813 Diag(Old->getLocation(), diag::note_previous_declaration); 1814 return true; 1815 } 1816 1817 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1818 RequiresAdjustment = true; 1819 } 1820 1821 // Merge ns_returns_retained attribute. 1822 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1823 if (NewTypeInfo.getProducesResult()) { 1824 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1825 Diag(Old->getLocation(), diag::note_previous_declaration); 1826 return true; 1827 } 1828 1829 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1830 RequiresAdjustment = true; 1831 } 1832 1833 if (RequiresAdjustment) { 1834 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1835 New->setType(QualType(NewType, 0)); 1836 NewQType = Context.getCanonicalType(New->getType()); 1837 } 1838 1839 if (getLangOptions().CPlusPlus) { 1840 // (C++98 13.1p2): 1841 // Certain function declarations cannot be overloaded: 1842 // -- Function declarations that differ only in the return type 1843 // cannot be overloaded. 1844 QualType OldReturnType = OldType->getResultType(); 1845 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1846 QualType ResQT; 1847 if (OldReturnType != NewReturnType) { 1848 if (NewReturnType->isObjCObjectPointerType() 1849 && OldReturnType->isObjCObjectPointerType()) 1850 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1851 if (ResQT.isNull()) { 1852 if (New->isCXXClassMember() && New->isOutOfLine()) 1853 Diag(New->getLocation(), 1854 diag::err_member_def_does_not_match_ret_type) << New; 1855 else 1856 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1857 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1858 return true; 1859 } 1860 else 1861 NewQType = ResQT; 1862 } 1863 1864 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1865 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1866 if (OldMethod && NewMethod) { 1867 // Preserve triviality. 1868 NewMethod->setTrivial(OldMethod->isTrivial()); 1869 1870 // MSVC allows explicit template specialization at class scope: 1871 // 2 CXMethodDecls referring to the same function will be injected. 1872 // We don't want a redeclartion error. 1873 bool IsClassScopeExplicitSpecialization = 1874 OldMethod->isFunctionTemplateSpecialization() && 1875 NewMethod->isFunctionTemplateSpecialization(); 1876 bool isFriend = NewMethod->getFriendObjectKind(); 1877 1878 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1879 !IsClassScopeExplicitSpecialization) { 1880 // -- Member function declarations with the same name and the 1881 // same parameter types cannot be overloaded if any of them 1882 // is a static member function declaration. 1883 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1884 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1885 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1886 return true; 1887 } 1888 1889 // C++ [class.mem]p1: 1890 // [...] A member shall not be declared twice in the 1891 // member-specification, except that a nested class or member 1892 // class template can be declared and then later defined. 1893 unsigned NewDiag; 1894 if (isa<CXXConstructorDecl>(OldMethod)) 1895 NewDiag = diag::err_constructor_redeclared; 1896 else if (isa<CXXDestructorDecl>(NewMethod)) 1897 NewDiag = diag::err_destructor_redeclared; 1898 else if (isa<CXXConversionDecl>(NewMethod)) 1899 NewDiag = diag::err_conv_function_redeclared; 1900 else 1901 NewDiag = diag::err_member_redeclared; 1902 1903 Diag(New->getLocation(), NewDiag); 1904 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1905 1906 // Complain if this is an explicit declaration of a special 1907 // member that was initially declared implicitly. 1908 // 1909 // As an exception, it's okay to befriend such methods in order 1910 // to permit the implicit constructor/destructor/operator calls. 1911 } else if (OldMethod->isImplicit()) { 1912 if (isFriend) { 1913 NewMethod->setImplicit(); 1914 } else { 1915 Diag(NewMethod->getLocation(), 1916 diag::err_definition_of_implicitly_declared_member) 1917 << New << getSpecialMember(OldMethod); 1918 return true; 1919 } 1920 } else if (OldMethod->isExplicitlyDefaulted()) { 1921 Diag(NewMethod->getLocation(), 1922 diag::err_definition_of_explicitly_defaulted_member) 1923 << getSpecialMember(OldMethod); 1924 return true; 1925 } 1926 } 1927 1928 // (C++98 8.3.5p3): 1929 // All declarations for a function shall agree exactly in both the 1930 // return type and the parameter-type-list. 1931 // We also want to respect all the extended bits except noreturn. 1932 1933 // noreturn should now match unless the old type info didn't have it. 1934 QualType OldQTypeForComparison = OldQType; 1935 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1936 assert(OldQType == QualType(OldType, 0)); 1937 const FunctionType *OldTypeForComparison 1938 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1939 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1940 assert(OldQTypeForComparison.isCanonical()); 1941 } 1942 1943 if (OldQTypeForComparison == NewQType) 1944 return MergeCompatibleFunctionDecls(New, Old); 1945 1946 // Fall through for conflicting redeclarations and redefinitions. 1947 } 1948 1949 // C: Function types need to be compatible, not identical. This handles 1950 // duplicate function decls like "void f(int); void f(enum X);" properly. 1951 if (!getLangOptions().CPlusPlus && 1952 Context.typesAreCompatible(OldQType, NewQType)) { 1953 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1954 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1955 const FunctionProtoType *OldProto = 0; 1956 if (isa<FunctionNoProtoType>(NewFuncType) && 1957 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1958 // The old declaration provided a function prototype, but the 1959 // new declaration does not. Merge in the prototype. 1960 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1961 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1962 OldProto->arg_type_end()); 1963 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1964 ParamTypes.data(), ParamTypes.size(), 1965 OldProto->getExtProtoInfo()); 1966 New->setType(NewQType); 1967 New->setHasInheritedPrototype(); 1968 1969 // Synthesize a parameter for each argument type. 1970 SmallVector<ParmVarDecl*, 16> Params; 1971 for (FunctionProtoType::arg_type_iterator 1972 ParamType = OldProto->arg_type_begin(), 1973 ParamEnd = OldProto->arg_type_end(); 1974 ParamType != ParamEnd; ++ParamType) { 1975 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1976 SourceLocation(), 1977 SourceLocation(), 0, 1978 *ParamType, /*TInfo=*/0, 1979 SC_None, SC_None, 1980 0); 1981 Param->setScopeInfo(0, Params.size()); 1982 Param->setImplicit(); 1983 Params.push_back(Param); 1984 } 1985 1986 New->setParams(Params); 1987 } 1988 1989 return MergeCompatibleFunctionDecls(New, Old); 1990 } 1991 1992 // GNU C permits a K&R definition to follow a prototype declaration 1993 // if the declared types of the parameters in the K&R definition 1994 // match the types in the prototype declaration, even when the 1995 // promoted types of the parameters from the K&R definition differ 1996 // from the types in the prototype. GCC then keeps the types from 1997 // the prototype. 1998 // 1999 // If a variadic prototype is followed by a non-variadic K&R definition, 2000 // the K&R definition becomes variadic. This is sort of an edge case, but 2001 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 2002 // C99 6.9.1p8. 2003 if (!getLangOptions().CPlusPlus && 2004 Old->hasPrototype() && !New->hasPrototype() && 2005 New->getType()->getAs<FunctionProtoType>() && 2006 Old->getNumParams() == New->getNumParams()) { 2007 SmallVector<QualType, 16> ArgTypes; 2008 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 2009 const FunctionProtoType *OldProto 2010 = Old->getType()->getAs<FunctionProtoType>(); 2011 const FunctionProtoType *NewProto 2012 = New->getType()->getAs<FunctionProtoType>(); 2013 2014 // Determine whether this is the GNU C extension. 2015 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 2016 NewProto->getResultType()); 2017 bool LooseCompatible = !MergedReturn.isNull(); 2018 for (unsigned Idx = 0, End = Old->getNumParams(); 2019 LooseCompatible && Idx != End; ++Idx) { 2020 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 2021 ParmVarDecl *NewParm = New->getParamDecl(Idx); 2022 if (Context.typesAreCompatible(OldParm->getType(), 2023 NewProto->getArgType(Idx))) { 2024 ArgTypes.push_back(NewParm->getType()); 2025 } else if (Context.typesAreCompatible(OldParm->getType(), 2026 NewParm->getType(), 2027 /*CompareUnqualified=*/true)) { 2028 GNUCompatibleParamWarning Warn 2029 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 2030 Warnings.push_back(Warn); 2031 ArgTypes.push_back(NewParm->getType()); 2032 } else 2033 LooseCompatible = false; 2034 } 2035 2036 if (LooseCompatible) { 2037 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 2038 Diag(Warnings[Warn].NewParm->getLocation(), 2039 diag::ext_param_promoted_not_compatible_with_prototype) 2040 << Warnings[Warn].PromotedType 2041 << Warnings[Warn].OldParm->getType(); 2042 if (Warnings[Warn].OldParm->getLocation().isValid()) 2043 Diag(Warnings[Warn].OldParm->getLocation(), 2044 diag::note_previous_declaration); 2045 } 2046 2047 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 2048 ArgTypes.size(), 2049 OldProto->getExtProtoInfo())); 2050 return MergeCompatibleFunctionDecls(New, Old); 2051 } 2052 2053 // Fall through to diagnose conflicting types. 2054 } 2055 2056 // A function that has already been declared has been redeclared or defined 2057 // with a different type- show appropriate diagnostic 2058 if (unsigned BuiltinID = Old->getBuiltinID()) { 2059 // The user has declared a builtin function with an incompatible 2060 // signature. 2061 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2062 // The function the user is redeclaring is a library-defined 2063 // function like 'malloc' or 'printf'. Warn about the 2064 // redeclaration, then pretend that we don't know about this 2065 // library built-in. 2066 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2067 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2068 << Old << Old->getType(); 2069 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2070 Old->setInvalidDecl(); 2071 return false; 2072 } 2073 2074 PrevDiag = diag::note_previous_builtin_declaration; 2075 } 2076 2077 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2078 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2079 return true; 2080} 2081 2082/// \brief Completes the merge of two function declarations that are 2083/// known to be compatible. 2084/// 2085/// This routine handles the merging of attributes and other 2086/// properties of function declarations form the old declaration to 2087/// the new declaration, once we know that New is in fact a 2088/// redeclaration of Old. 2089/// 2090/// \returns false 2091bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2092 // Merge the attributes 2093 mergeDeclAttributes(New, Old); 2094 2095 // Merge the storage class. 2096 if (Old->getStorageClass() != SC_Extern && 2097 Old->getStorageClass() != SC_None) 2098 New->setStorageClass(Old->getStorageClass()); 2099 2100 // Merge "pure" flag. 2101 if (Old->isPure()) 2102 New->setPure(); 2103 2104 // Merge attributes from the parameters. These can mismatch with K&R 2105 // declarations. 2106 if (New->getNumParams() == Old->getNumParams()) 2107 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2108 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2109 Context); 2110 2111 if (getLangOptions().CPlusPlus) 2112 return MergeCXXFunctionDecl(New, Old); 2113 2114 return false; 2115} 2116 2117 2118void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2119 ObjCMethodDecl *oldMethod) { 2120 // We don't want to merge unavailable and deprecated attributes 2121 // except from interface to implementation. 2122 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2123 2124 // Merge the attributes. 2125 mergeDeclAttributes(newMethod, oldMethod, mergeDeprecation); 2126 2127 // Merge attributes from the parameters. 2128 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2129 for (ObjCMethodDecl::param_iterator 2130 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2131 ni != ne; ++ni, ++oi) 2132 mergeParamDeclAttributes(*ni, *oi, Context); 2133 2134 CheckObjCMethodOverride(newMethod, oldMethod, true); 2135} 2136 2137/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2138/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2139/// emitting diagnostics as appropriate. 2140/// 2141/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2142/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2143/// check them before the initializer is attached. 2144/// 2145void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2146 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2147 return; 2148 2149 QualType MergedT; 2150 if (getLangOptions().CPlusPlus) { 2151 AutoType *AT = New->getType()->getContainedAutoType(); 2152 if (AT && !AT->isDeduced()) { 2153 // We don't know what the new type is until the initializer is attached. 2154 return; 2155 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2156 // These could still be something that needs exception specs checked. 2157 return MergeVarDeclExceptionSpecs(New, Old); 2158 } 2159 // C++ [basic.link]p10: 2160 // [...] the types specified by all declarations referring to a given 2161 // object or function shall be identical, except that declarations for an 2162 // array object can specify array types that differ by the presence or 2163 // absence of a major array bound (8.3.4). 2164 else if (Old->getType()->isIncompleteArrayType() && 2165 New->getType()->isArrayType()) { 2166 CanQual<ArrayType> OldArray 2167 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2168 CanQual<ArrayType> NewArray 2169 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2170 if (OldArray->getElementType() == NewArray->getElementType()) 2171 MergedT = New->getType(); 2172 } else if (Old->getType()->isArrayType() && 2173 New->getType()->isIncompleteArrayType()) { 2174 CanQual<ArrayType> OldArray 2175 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2176 CanQual<ArrayType> NewArray 2177 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2178 if (OldArray->getElementType() == NewArray->getElementType()) 2179 MergedT = Old->getType(); 2180 } else if (New->getType()->isObjCObjectPointerType() 2181 && Old->getType()->isObjCObjectPointerType()) { 2182 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2183 Old->getType()); 2184 } 2185 } else { 2186 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2187 } 2188 if (MergedT.isNull()) { 2189 Diag(New->getLocation(), diag::err_redefinition_different_type) 2190 << New->getDeclName(); 2191 Diag(Old->getLocation(), diag::note_previous_definition); 2192 return New->setInvalidDecl(); 2193 } 2194 New->setType(MergedT); 2195} 2196 2197/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2198/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2199/// situation, merging decls or emitting diagnostics as appropriate. 2200/// 2201/// Tentative definition rules (C99 6.9.2p2) are checked by 2202/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2203/// definitions here, since the initializer hasn't been attached. 2204/// 2205void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2206 // If the new decl is already invalid, don't do any other checking. 2207 if (New->isInvalidDecl()) 2208 return; 2209 2210 // Verify the old decl was also a variable. 2211 VarDecl *Old = 0; 2212 if (!Previous.isSingleResult() || 2213 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2214 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2215 << New->getDeclName(); 2216 Diag(Previous.getRepresentativeDecl()->getLocation(), 2217 diag::note_previous_definition); 2218 return New->setInvalidDecl(); 2219 } 2220 2221 // C++ [class.mem]p1: 2222 // A member shall not be declared twice in the member-specification [...] 2223 // 2224 // Here, we need only consider static data members. 2225 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2226 Diag(New->getLocation(), diag::err_duplicate_member) 2227 << New->getIdentifier(); 2228 Diag(Old->getLocation(), diag::note_previous_declaration); 2229 New->setInvalidDecl(); 2230 } 2231 2232 mergeDeclAttributes(New, Old); 2233 // Warn if an already-declared variable is made a weak_import in a subsequent 2234 // declaration 2235 if (New->getAttr<WeakImportAttr>() && 2236 Old->getStorageClass() == SC_None && 2237 !Old->getAttr<WeakImportAttr>()) { 2238 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2239 Diag(Old->getLocation(), diag::note_previous_definition); 2240 // Remove weak_import attribute on new declaration. 2241 New->dropAttr<WeakImportAttr>(); 2242 } 2243 2244 // Merge the types. 2245 MergeVarDeclTypes(New, Old); 2246 if (New->isInvalidDecl()) 2247 return; 2248 2249 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2250 if (New->getStorageClass() == SC_Static && 2251 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2252 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2253 Diag(Old->getLocation(), diag::note_previous_definition); 2254 return New->setInvalidDecl(); 2255 } 2256 // C99 6.2.2p4: 2257 // For an identifier declared with the storage-class specifier 2258 // extern in a scope in which a prior declaration of that 2259 // identifier is visible,23) if the prior declaration specifies 2260 // internal or external linkage, the linkage of the identifier at 2261 // the later declaration is the same as the linkage specified at 2262 // the prior declaration. If no prior declaration is visible, or 2263 // if the prior declaration specifies no linkage, then the 2264 // identifier has external linkage. 2265 if (New->hasExternalStorage() && Old->hasLinkage()) 2266 /* Okay */; 2267 else if (New->getStorageClass() != SC_Static && 2268 Old->getStorageClass() == SC_Static) { 2269 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2270 Diag(Old->getLocation(), diag::note_previous_definition); 2271 return New->setInvalidDecl(); 2272 } 2273 2274 // Check if extern is followed by non-extern and vice-versa. 2275 if (New->hasExternalStorage() && 2276 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2277 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2278 Diag(Old->getLocation(), diag::note_previous_definition); 2279 return New->setInvalidDecl(); 2280 } 2281 if (Old->hasExternalStorage() && 2282 !New->hasLinkage() && New->isLocalVarDecl()) { 2283 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2284 Diag(Old->getLocation(), diag::note_previous_definition); 2285 return New->setInvalidDecl(); 2286 } 2287 2288 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2289 2290 // FIXME: The test for external storage here seems wrong? We still 2291 // need to check for mismatches. 2292 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2293 // Don't complain about out-of-line definitions of static members. 2294 !(Old->getLexicalDeclContext()->isRecord() && 2295 !New->getLexicalDeclContext()->isRecord())) { 2296 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2297 Diag(Old->getLocation(), diag::note_previous_definition); 2298 return New->setInvalidDecl(); 2299 } 2300 2301 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2302 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2303 Diag(Old->getLocation(), diag::note_previous_definition); 2304 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2305 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2306 Diag(Old->getLocation(), diag::note_previous_definition); 2307 } 2308 2309 // C++ doesn't have tentative definitions, so go right ahead and check here. 2310 const VarDecl *Def; 2311 if (getLangOptions().CPlusPlus && 2312 New->isThisDeclarationADefinition() == VarDecl::Definition && 2313 (Def = Old->getDefinition())) { 2314 Diag(New->getLocation(), diag::err_redefinition) 2315 << New->getDeclName(); 2316 Diag(Def->getLocation(), diag::note_previous_definition); 2317 New->setInvalidDecl(); 2318 return; 2319 } 2320 // c99 6.2.2 P4. 2321 // For an identifier declared with the storage-class specifier extern in a 2322 // scope in which a prior declaration of that identifier is visible, if 2323 // the prior declaration specifies internal or external linkage, the linkage 2324 // of the identifier at the later declaration is the same as the linkage 2325 // specified at the prior declaration. 2326 // FIXME. revisit this code. 2327 if (New->hasExternalStorage() && 2328 Old->getLinkage() == InternalLinkage && 2329 New->getDeclContext() == Old->getDeclContext()) 2330 New->setStorageClass(Old->getStorageClass()); 2331 2332 // Keep a chain of previous declarations. 2333 New->setPreviousDeclaration(Old); 2334 2335 // Inherit access appropriately. 2336 New->setAccess(Old->getAccess()); 2337} 2338 2339/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2340/// no declarator (e.g. "struct foo;") is parsed. 2341Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2342 DeclSpec &DS) { 2343 return ParsedFreeStandingDeclSpec(S, AS, DS, 2344 MultiTemplateParamsArg(*this, 0, 0)); 2345} 2346 2347/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2348/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2349/// parameters to cope with template friend declarations. 2350Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2351 DeclSpec &DS, 2352 MultiTemplateParamsArg TemplateParams) { 2353 Decl *TagD = 0; 2354 TagDecl *Tag = 0; 2355 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2356 DS.getTypeSpecType() == DeclSpec::TST_struct || 2357 DS.getTypeSpecType() == DeclSpec::TST_union || 2358 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2359 TagD = DS.getRepAsDecl(); 2360 2361 if (!TagD) // We probably had an error 2362 return 0; 2363 2364 // Note that the above type specs guarantee that the 2365 // type rep is a Decl, whereas in many of the others 2366 // it's a Type. 2367 if (isa<TagDecl>(TagD)) 2368 Tag = cast<TagDecl>(TagD); 2369 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2370 Tag = CTD->getTemplatedDecl(); 2371 } 2372 2373 if (Tag) 2374 Tag->setFreeStanding(); 2375 2376 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2377 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2378 // or incomplete types shall not be restrict-qualified." 2379 if (TypeQuals & DeclSpec::TQ_restrict) 2380 Diag(DS.getRestrictSpecLoc(), 2381 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2382 << DS.getSourceRange(); 2383 } 2384 2385 if (DS.isConstexprSpecified()) { 2386 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2387 // and definitions of functions and variables. 2388 if (Tag) 2389 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2390 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2391 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2392 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2393 else 2394 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2395 // Don't emit warnings after this error. 2396 return TagD; 2397 } 2398 2399 if (DS.isFriendSpecified()) { 2400 // If we're dealing with a decl but not a TagDecl, assume that 2401 // whatever routines created it handled the friendship aspect. 2402 if (TagD && !Tag) 2403 return 0; 2404 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2405 } 2406 2407 // Track whether we warned about the fact that there aren't any 2408 // declarators. 2409 bool emittedWarning = false; 2410 2411 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2412 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2413 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2414 if (getLangOptions().CPlusPlus || 2415 Record->getDeclContext()->isRecord()) 2416 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2417 2418 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2419 << DS.getSourceRange(); 2420 emittedWarning = true; 2421 } 2422 } 2423 2424 // Check for Microsoft C extension: anonymous struct. 2425 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2426 CurContext->isRecord() && 2427 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2428 // Handle 2 kinds of anonymous struct: 2429 // struct STRUCT; 2430 // and 2431 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2432 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2433 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2434 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2435 DS.getRepAsType().get()->isStructureType())) { 2436 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2437 << DS.getSourceRange(); 2438 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2439 } 2440 } 2441 2442 if (getLangOptions().CPlusPlus && 2443 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2444 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2445 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2446 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2447 Diag(Enum->getLocation(), diag::ext_no_declarators) 2448 << DS.getSourceRange(); 2449 emittedWarning = true; 2450 } 2451 2452 // Skip all the checks below if we have a type error. 2453 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2454 2455 if (!DS.isMissingDeclaratorOk()) { 2456 // Warn about typedefs of enums without names, since this is an 2457 // extension in both Microsoft and GNU. 2458 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2459 Tag && isa<EnumDecl>(Tag)) { 2460 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2461 << DS.getSourceRange(); 2462 return Tag; 2463 } 2464 2465 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2466 << DS.getSourceRange(); 2467 emittedWarning = true; 2468 } 2469 2470 // We're going to complain about a bunch of spurious specifiers; 2471 // only do this if we're declaring a tag, because otherwise we 2472 // should be getting diag::ext_no_declarators. 2473 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2474 return TagD; 2475 2476 // Note that a linkage-specification sets a storage class, but 2477 // 'extern "C" struct foo;' is actually valid and not theoretically 2478 // useless. 2479 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2480 if (!DS.isExternInLinkageSpec()) 2481 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2482 << DeclSpec::getSpecifierName(scs); 2483 2484 if (DS.isThreadSpecified()) 2485 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2486 if (DS.getTypeQualifiers()) { 2487 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2488 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2489 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2490 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2491 // Restrict is covered above. 2492 } 2493 if (DS.isInlineSpecified()) 2494 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2495 if (DS.isVirtualSpecified()) 2496 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2497 if (DS.isExplicitSpecified()) 2498 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2499 2500 if (DS.isModulePrivateSpecified() && 2501 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2502 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2503 << Tag->getTagKind() 2504 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2505 2506 // Warn about ignored type attributes, for example: 2507 // __attribute__((aligned)) struct A; 2508 // Attributes should be placed after tag to apply to type declaration. 2509 if (!DS.getAttributes().empty()) { 2510 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2511 if (TypeSpecType == DeclSpec::TST_class || 2512 TypeSpecType == DeclSpec::TST_struct || 2513 TypeSpecType == DeclSpec::TST_union || 2514 TypeSpecType == DeclSpec::TST_enum) { 2515 AttributeList* attrs = DS.getAttributes().getList(); 2516 while (attrs) { 2517 Diag(attrs->getScopeLoc(), 2518 diag::warn_declspec_attribute_ignored) 2519 << attrs->getName() 2520 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2521 TypeSpecType == DeclSpec::TST_struct ? 1 : 2522 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2523 attrs = attrs->getNext(); 2524 } 2525 } 2526 } 2527 2528 return TagD; 2529} 2530 2531/// We are trying to inject an anonymous member into the given scope; 2532/// check if there's an existing declaration that can't be overloaded. 2533/// 2534/// \return true if this is a forbidden redeclaration 2535static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2536 Scope *S, 2537 DeclContext *Owner, 2538 DeclarationName Name, 2539 SourceLocation NameLoc, 2540 unsigned diagnostic) { 2541 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2542 Sema::ForRedeclaration); 2543 if (!SemaRef.LookupName(R, S)) return false; 2544 2545 if (R.getAsSingle<TagDecl>()) 2546 return false; 2547 2548 // Pick a representative declaration. 2549 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2550 assert(PrevDecl && "Expected a non-null Decl"); 2551 2552 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2553 return false; 2554 2555 SemaRef.Diag(NameLoc, diagnostic) << Name; 2556 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2557 2558 return true; 2559} 2560 2561/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2562/// anonymous struct or union AnonRecord into the owning context Owner 2563/// and scope S. This routine will be invoked just after we realize 2564/// that an unnamed union or struct is actually an anonymous union or 2565/// struct, e.g., 2566/// 2567/// @code 2568/// union { 2569/// int i; 2570/// float f; 2571/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2572/// // f into the surrounding scope.x 2573/// @endcode 2574/// 2575/// This routine is recursive, injecting the names of nested anonymous 2576/// structs/unions into the owning context and scope as well. 2577static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2578 DeclContext *Owner, 2579 RecordDecl *AnonRecord, 2580 AccessSpecifier AS, 2581 SmallVector<NamedDecl*, 2> &Chaining, 2582 bool MSAnonStruct) { 2583 unsigned diagKind 2584 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2585 : diag::err_anonymous_struct_member_redecl; 2586 2587 bool Invalid = false; 2588 2589 // Look every FieldDecl and IndirectFieldDecl with a name. 2590 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2591 DEnd = AnonRecord->decls_end(); 2592 D != DEnd; ++D) { 2593 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2594 cast<NamedDecl>(*D)->getDeclName()) { 2595 ValueDecl *VD = cast<ValueDecl>(*D); 2596 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2597 VD->getLocation(), diagKind)) { 2598 // C++ [class.union]p2: 2599 // The names of the members of an anonymous union shall be 2600 // distinct from the names of any other entity in the 2601 // scope in which the anonymous union is declared. 2602 Invalid = true; 2603 } else { 2604 // C++ [class.union]p2: 2605 // For the purpose of name lookup, after the anonymous union 2606 // definition, the members of the anonymous union are 2607 // considered to have been defined in the scope in which the 2608 // anonymous union is declared. 2609 unsigned OldChainingSize = Chaining.size(); 2610 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2611 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2612 PE = IF->chain_end(); PI != PE; ++PI) 2613 Chaining.push_back(*PI); 2614 else 2615 Chaining.push_back(VD); 2616 2617 assert(Chaining.size() >= 2); 2618 NamedDecl **NamedChain = 2619 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2620 for (unsigned i = 0; i < Chaining.size(); i++) 2621 NamedChain[i] = Chaining[i]; 2622 2623 IndirectFieldDecl* IndirectField = 2624 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2625 VD->getIdentifier(), VD->getType(), 2626 NamedChain, Chaining.size()); 2627 2628 IndirectField->setAccess(AS); 2629 IndirectField->setImplicit(); 2630 SemaRef.PushOnScopeChains(IndirectField, S); 2631 2632 // That includes picking up the appropriate access specifier. 2633 if (AS != AS_none) IndirectField->setAccess(AS); 2634 2635 Chaining.resize(OldChainingSize); 2636 } 2637 } 2638 } 2639 2640 return Invalid; 2641} 2642 2643/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2644/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2645/// illegal input values are mapped to SC_None. 2646static StorageClass 2647StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2648 switch (StorageClassSpec) { 2649 case DeclSpec::SCS_unspecified: return SC_None; 2650 case DeclSpec::SCS_extern: return SC_Extern; 2651 case DeclSpec::SCS_static: return SC_Static; 2652 case DeclSpec::SCS_auto: return SC_Auto; 2653 case DeclSpec::SCS_register: return SC_Register; 2654 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2655 // Illegal SCSs map to None: error reporting is up to the caller. 2656 case DeclSpec::SCS_mutable: // Fall through. 2657 case DeclSpec::SCS_typedef: return SC_None; 2658 } 2659 llvm_unreachable("unknown storage class specifier"); 2660} 2661 2662/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2663/// a StorageClass. Any error reporting is up to the caller: 2664/// illegal input values are mapped to SC_None. 2665static StorageClass 2666StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2667 switch (StorageClassSpec) { 2668 case DeclSpec::SCS_unspecified: return SC_None; 2669 case DeclSpec::SCS_extern: return SC_Extern; 2670 case DeclSpec::SCS_static: return SC_Static; 2671 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2672 // Illegal SCSs map to None: error reporting is up to the caller. 2673 case DeclSpec::SCS_auto: // Fall through. 2674 case DeclSpec::SCS_mutable: // Fall through. 2675 case DeclSpec::SCS_register: // Fall through. 2676 case DeclSpec::SCS_typedef: return SC_None; 2677 } 2678 llvm_unreachable("unknown storage class specifier"); 2679} 2680 2681/// BuildAnonymousStructOrUnion - Handle the declaration of an 2682/// anonymous structure or union. Anonymous unions are a C++ feature 2683/// (C++ [class.union]) and a C11 feature; anonymous structures 2684/// are a C11 feature and GNU C++ extension. 2685Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2686 AccessSpecifier AS, 2687 RecordDecl *Record) { 2688 DeclContext *Owner = Record->getDeclContext(); 2689 2690 // Diagnose whether this anonymous struct/union is an extension. 2691 if (Record->isUnion() && !getLangOptions().CPlusPlus && !getLangOptions().C11) 2692 Diag(Record->getLocation(), diag::ext_anonymous_union); 2693 else if (!Record->isUnion() && getLangOptions().CPlusPlus) 2694 Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct); 2695 else if (!Record->isUnion() && !getLangOptions().C11) 2696 Diag(Record->getLocation(), diag::ext_c11_anonymous_struct); 2697 2698 // C and C++ require different kinds of checks for anonymous 2699 // structs/unions. 2700 bool Invalid = false; 2701 if (getLangOptions().CPlusPlus) { 2702 const char* PrevSpec = 0; 2703 unsigned DiagID; 2704 if (Record->isUnion()) { 2705 // C++ [class.union]p6: 2706 // Anonymous unions declared in a named namespace or in the 2707 // global namespace shall be declared static. 2708 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2709 (isa<TranslationUnitDecl>(Owner) || 2710 (isa<NamespaceDecl>(Owner) && 2711 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2712 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2713 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2714 2715 // Recover by adding 'static'. 2716 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2717 PrevSpec, DiagID); 2718 } 2719 // C++ [class.union]p6: 2720 // A storage class is not allowed in a declaration of an 2721 // anonymous union in a class scope. 2722 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2723 isa<RecordDecl>(Owner)) { 2724 Diag(DS.getStorageClassSpecLoc(), 2725 diag::err_anonymous_union_with_storage_spec) 2726 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2727 2728 // Recover by removing the storage specifier. 2729 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2730 SourceLocation(), 2731 PrevSpec, DiagID); 2732 } 2733 } 2734 2735 // Ignore const/volatile/restrict qualifiers. 2736 if (DS.getTypeQualifiers()) { 2737 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2738 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2739 << Record->isUnion() << 0 2740 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2741 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2742 Diag(DS.getVolatileSpecLoc(), 2743 diag::ext_anonymous_struct_union_qualified) 2744 << Record->isUnion() << 1 2745 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2746 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2747 Diag(DS.getRestrictSpecLoc(), 2748 diag::ext_anonymous_struct_union_qualified) 2749 << Record->isUnion() << 2 2750 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2751 2752 DS.ClearTypeQualifiers(); 2753 } 2754 2755 // C++ [class.union]p2: 2756 // The member-specification of an anonymous union shall only 2757 // define non-static data members. [Note: nested types and 2758 // functions cannot be declared within an anonymous union. ] 2759 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2760 MemEnd = Record->decls_end(); 2761 Mem != MemEnd; ++Mem) { 2762 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2763 // C++ [class.union]p3: 2764 // An anonymous union shall not have private or protected 2765 // members (clause 11). 2766 assert(FD->getAccess() != AS_none); 2767 if (FD->getAccess() != AS_public) { 2768 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2769 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2770 Invalid = true; 2771 } 2772 2773 // C++ [class.union]p1 2774 // An object of a class with a non-trivial constructor, a non-trivial 2775 // copy constructor, a non-trivial destructor, or a non-trivial copy 2776 // assignment operator cannot be a member of a union, nor can an 2777 // array of such objects. 2778 if (CheckNontrivialField(FD)) 2779 Invalid = true; 2780 } else if ((*Mem)->isImplicit()) { 2781 // Any implicit members are fine. 2782 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2783 // This is a type that showed up in an 2784 // elaborated-type-specifier inside the anonymous struct or 2785 // union, but which actually declares a type outside of the 2786 // anonymous struct or union. It's okay. 2787 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2788 if (!MemRecord->isAnonymousStructOrUnion() && 2789 MemRecord->getDeclName()) { 2790 // Visual C++ allows type definition in anonymous struct or union. 2791 if (getLangOptions().MicrosoftExt) 2792 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2793 << (int)Record->isUnion(); 2794 else { 2795 // This is a nested type declaration. 2796 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2797 << (int)Record->isUnion(); 2798 Invalid = true; 2799 } 2800 } 2801 } else if (isa<AccessSpecDecl>(*Mem)) { 2802 // Any access specifier is fine. 2803 } else { 2804 // We have something that isn't a non-static data 2805 // member. Complain about it. 2806 unsigned DK = diag::err_anonymous_record_bad_member; 2807 if (isa<TypeDecl>(*Mem)) 2808 DK = diag::err_anonymous_record_with_type; 2809 else if (isa<FunctionDecl>(*Mem)) 2810 DK = diag::err_anonymous_record_with_function; 2811 else if (isa<VarDecl>(*Mem)) 2812 DK = diag::err_anonymous_record_with_static; 2813 2814 // Visual C++ allows type definition in anonymous struct or union. 2815 if (getLangOptions().MicrosoftExt && 2816 DK == diag::err_anonymous_record_with_type) 2817 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2818 << (int)Record->isUnion(); 2819 else { 2820 Diag((*Mem)->getLocation(), DK) 2821 << (int)Record->isUnion(); 2822 Invalid = true; 2823 } 2824 } 2825 } 2826 } 2827 2828 if (!Record->isUnion() && !Owner->isRecord()) { 2829 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2830 << (int)getLangOptions().CPlusPlus; 2831 Invalid = true; 2832 } 2833 2834 // Mock up a declarator. 2835 Declarator Dc(DS, Declarator::MemberContext); 2836 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2837 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2838 2839 // Create a declaration for this anonymous struct/union. 2840 NamedDecl *Anon = 0; 2841 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2842 Anon = FieldDecl::Create(Context, OwningClass, 2843 DS.getSourceRange().getBegin(), 2844 Record->getLocation(), 2845 /*IdentifierInfo=*/0, 2846 Context.getTypeDeclType(Record), 2847 TInfo, 2848 /*BitWidth=*/0, /*Mutable=*/false, 2849 /*HasInit=*/false); 2850 Anon->setAccess(AS); 2851 if (getLangOptions().CPlusPlus) 2852 FieldCollector->Add(cast<FieldDecl>(Anon)); 2853 } else { 2854 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2855 assert(SCSpec != DeclSpec::SCS_typedef && 2856 "Parser allowed 'typedef' as storage class VarDecl."); 2857 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2858 if (SCSpec == DeclSpec::SCS_mutable) { 2859 // mutable can only appear on non-static class members, so it's always 2860 // an error here 2861 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2862 Invalid = true; 2863 SC = SC_None; 2864 } 2865 SCSpec = DS.getStorageClassSpecAsWritten(); 2866 VarDecl::StorageClass SCAsWritten 2867 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2868 2869 Anon = VarDecl::Create(Context, Owner, 2870 DS.getSourceRange().getBegin(), 2871 Record->getLocation(), /*IdentifierInfo=*/0, 2872 Context.getTypeDeclType(Record), 2873 TInfo, SC, SCAsWritten); 2874 2875 // Default-initialize the implicit variable. This initialization will be 2876 // trivial in almost all cases, except if a union member has an in-class 2877 // initializer: 2878 // union { int n = 0; }; 2879 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2880 } 2881 Anon->setImplicit(); 2882 2883 // Add the anonymous struct/union object to the current 2884 // context. We'll be referencing this object when we refer to one of 2885 // its members. 2886 Owner->addDecl(Anon); 2887 2888 // Inject the members of the anonymous struct/union into the owning 2889 // context and into the identifier resolver chain for name lookup 2890 // purposes. 2891 SmallVector<NamedDecl*, 2> Chain; 2892 Chain.push_back(Anon); 2893 2894 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2895 Chain, false)) 2896 Invalid = true; 2897 2898 // Mark this as an anonymous struct/union type. Note that we do not 2899 // do this until after we have already checked and injected the 2900 // members of this anonymous struct/union type, because otherwise 2901 // the members could be injected twice: once by DeclContext when it 2902 // builds its lookup table, and once by 2903 // InjectAnonymousStructOrUnionMembers. 2904 Record->setAnonymousStructOrUnion(true); 2905 2906 if (Invalid) 2907 Anon->setInvalidDecl(); 2908 2909 return Anon; 2910} 2911 2912/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2913/// Microsoft C anonymous structure. 2914/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2915/// Example: 2916/// 2917/// struct A { int a; }; 2918/// struct B { struct A; int b; }; 2919/// 2920/// void foo() { 2921/// B var; 2922/// var.a = 3; 2923/// } 2924/// 2925Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2926 RecordDecl *Record) { 2927 2928 // If there is no Record, get the record via the typedef. 2929 if (!Record) 2930 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2931 2932 // Mock up a declarator. 2933 Declarator Dc(DS, Declarator::TypeNameContext); 2934 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2935 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2936 2937 // Create a declaration for this anonymous struct. 2938 NamedDecl* Anon = FieldDecl::Create(Context, 2939 cast<RecordDecl>(CurContext), 2940 DS.getSourceRange().getBegin(), 2941 DS.getSourceRange().getBegin(), 2942 /*IdentifierInfo=*/0, 2943 Context.getTypeDeclType(Record), 2944 TInfo, 2945 /*BitWidth=*/0, /*Mutable=*/false, 2946 /*HasInit=*/false); 2947 Anon->setImplicit(); 2948 2949 // Add the anonymous struct object to the current context. 2950 CurContext->addDecl(Anon); 2951 2952 // Inject the members of the anonymous struct into the current 2953 // context and into the identifier resolver chain for name lookup 2954 // purposes. 2955 SmallVector<NamedDecl*, 2> Chain; 2956 Chain.push_back(Anon); 2957 2958 RecordDecl *RecordDef = Record->getDefinition(); 2959 if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2960 RecordDef, AS_none, 2961 Chain, true)) 2962 Anon->setInvalidDecl(); 2963 2964 return Anon; 2965} 2966 2967/// GetNameForDeclarator - Determine the full declaration name for the 2968/// given Declarator. 2969DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2970 return GetNameFromUnqualifiedId(D.getName()); 2971} 2972 2973/// \brief Retrieves the declaration name from a parsed unqualified-id. 2974DeclarationNameInfo 2975Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2976 DeclarationNameInfo NameInfo; 2977 NameInfo.setLoc(Name.StartLocation); 2978 2979 switch (Name.getKind()) { 2980 2981 case UnqualifiedId::IK_ImplicitSelfParam: 2982 case UnqualifiedId::IK_Identifier: 2983 NameInfo.setName(Name.Identifier); 2984 NameInfo.setLoc(Name.StartLocation); 2985 return NameInfo; 2986 2987 case UnqualifiedId::IK_OperatorFunctionId: 2988 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2989 Name.OperatorFunctionId.Operator)); 2990 NameInfo.setLoc(Name.StartLocation); 2991 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2992 = Name.OperatorFunctionId.SymbolLocations[0]; 2993 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2994 = Name.EndLocation.getRawEncoding(); 2995 return NameInfo; 2996 2997 case UnqualifiedId::IK_LiteralOperatorId: 2998 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2999 Name.Identifier)); 3000 NameInfo.setLoc(Name.StartLocation); 3001 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 3002 return NameInfo; 3003 3004 case UnqualifiedId::IK_ConversionFunctionId: { 3005 TypeSourceInfo *TInfo; 3006 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 3007 if (Ty.isNull()) 3008 return DeclarationNameInfo(); 3009 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 3010 Context.getCanonicalType(Ty))); 3011 NameInfo.setLoc(Name.StartLocation); 3012 NameInfo.setNamedTypeInfo(TInfo); 3013 return NameInfo; 3014 } 3015 3016 case UnqualifiedId::IK_ConstructorName: { 3017 TypeSourceInfo *TInfo; 3018 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 3019 if (Ty.isNull()) 3020 return DeclarationNameInfo(); 3021 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3022 Context.getCanonicalType(Ty))); 3023 NameInfo.setLoc(Name.StartLocation); 3024 NameInfo.setNamedTypeInfo(TInfo); 3025 return NameInfo; 3026 } 3027 3028 case UnqualifiedId::IK_ConstructorTemplateId: { 3029 // In well-formed code, we can only have a constructor 3030 // template-id that refers to the current context, so go there 3031 // to find the actual type being constructed. 3032 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 3033 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 3034 return DeclarationNameInfo(); 3035 3036 // Determine the type of the class being constructed. 3037 QualType CurClassType = Context.getTypeDeclType(CurClass); 3038 3039 // FIXME: Check two things: that the template-id names the same type as 3040 // CurClassType, and that the template-id does not occur when the name 3041 // was qualified. 3042 3043 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3044 Context.getCanonicalType(CurClassType))); 3045 NameInfo.setLoc(Name.StartLocation); 3046 // FIXME: should we retrieve TypeSourceInfo? 3047 NameInfo.setNamedTypeInfo(0); 3048 return NameInfo; 3049 } 3050 3051 case UnqualifiedId::IK_DestructorName: { 3052 TypeSourceInfo *TInfo; 3053 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3054 if (Ty.isNull()) 3055 return DeclarationNameInfo(); 3056 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3057 Context.getCanonicalType(Ty))); 3058 NameInfo.setLoc(Name.StartLocation); 3059 NameInfo.setNamedTypeInfo(TInfo); 3060 return NameInfo; 3061 } 3062 3063 case UnqualifiedId::IK_TemplateId: { 3064 TemplateName TName = Name.TemplateId->Template.get(); 3065 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3066 return Context.getNameForTemplate(TName, TNameLoc); 3067 } 3068 3069 } // switch (Name.getKind()) 3070 3071 llvm_unreachable("Unknown name kind"); 3072} 3073 3074static QualType getCoreType(QualType Ty) { 3075 do { 3076 if (Ty->isPointerType() || Ty->isReferenceType()) 3077 Ty = Ty->getPointeeType(); 3078 else if (Ty->isArrayType()) 3079 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3080 else 3081 return Ty.withoutLocalFastQualifiers(); 3082 } while (true); 3083} 3084 3085/// hasSimilarParameters - Determine whether the C++ functions Declaration 3086/// and Definition have "nearly" matching parameters. This heuristic is 3087/// used to improve diagnostics in the case where an out-of-line function 3088/// definition doesn't match any declaration within the class or namespace. 3089/// Also sets Params to the list of indices to the parameters that differ 3090/// between the declaration and the definition. If hasSimilarParameters 3091/// returns true and Params is empty, then all of the parameters match. 3092static bool hasSimilarParameters(ASTContext &Context, 3093 FunctionDecl *Declaration, 3094 FunctionDecl *Definition, 3095 llvm::SmallVectorImpl<unsigned> &Params) { 3096 Params.clear(); 3097 if (Declaration->param_size() != Definition->param_size()) 3098 return false; 3099 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3100 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3101 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3102 3103 // The parameter types are identical 3104 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3105 continue; 3106 3107 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3108 QualType DefParamBaseTy = getCoreType(DefParamTy); 3109 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3110 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3111 3112 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3113 (DeclTyName && DeclTyName == DefTyName)) 3114 Params.push_back(Idx); 3115 else // The two parameters aren't even close 3116 return false; 3117 } 3118 3119 return true; 3120} 3121 3122/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3123/// declarator needs to be rebuilt in the current instantiation. 3124/// Any bits of declarator which appear before the name are valid for 3125/// consideration here. That's specifically the type in the decl spec 3126/// and the base type in any member-pointer chunks. 3127static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3128 DeclarationName Name) { 3129 // The types we specifically need to rebuild are: 3130 // - typenames, typeofs, and decltypes 3131 // - types which will become injected class names 3132 // Of course, we also need to rebuild any type referencing such a 3133 // type. It's safest to just say "dependent", but we call out a 3134 // few cases here. 3135 3136 DeclSpec &DS = D.getMutableDeclSpec(); 3137 switch (DS.getTypeSpecType()) { 3138 case DeclSpec::TST_typename: 3139 case DeclSpec::TST_typeofType: 3140 case DeclSpec::TST_decltype: 3141 case DeclSpec::TST_underlyingType: 3142 case DeclSpec::TST_atomic: { 3143 // Grab the type from the parser. 3144 TypeSourceInfo *TSI = 0; 3145 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3146 if (T.isNull() || !T->isDependentType()) break; 3147 3148 // Make sure there's a type source info. This isn't really much 3149 // of a waste; most dependent types should have type source info 3150 // attached already. 3151 if (!TSI) 3152 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3153 3154 // Rebuild the type in the current instantiation. 3155 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3156 if (!TSI) return true; 3157 3158 // Store the new type back in the decl spec. 3159 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3160 DS.UpdateTypeRep(LocType); 3161 break; 3162 } 3163 3164 case DeclSpec::TST_typeofExpr: { 3165 Expr *E = DS.getRepAsExpr(); 3166 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3167 if (Result.isInvalid()) return true; 3168 DS.UpdateExprRep(Result.get()); 3169 break; 3170 } 3171 3172 default: 3173 // Nothing to do for these decl specs. 3174 break; 3175 } 3176 3177 // It doesn't matter what order we do this in. 3178 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3179 DeclaratorChunk &Chunk = D.getTypeObject(I); 3180 3181 // The only type information in the declarator which can come 3182 // before the declaration name is the base type of a member 3183 // pointer. 3184 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3185 continue; 3186 3187 // Rebuild the scope specifier in-place. 3188 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3189 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3190 return true; 3191 } 3192 3193 return false; 3194} 3195 3196Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3197 D.setFunctionDefinitionKind(FDK_Declaration); 3198 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3199 3200 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3201 Dcl->getDeclContext()->isFileContext()) 3202 Dcl->setTopLevelDeclInObjCContainer(); 3203 3204 return Dcl; 3205} 3206 3207/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3208/// If T is the name of a class, then each of the following shall have a 3209/// name different from T: 3210/// - every static data member of class T; 3211/// - every member function of class T 3212/// - every member of class T that is itself a type; 3213/// \returns true if the declaration name violates these rules. 3214bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3215 DeclarationNameInfo NameInfo) { 3216 DeclarationName Name = NameInfo.getName(); 3217 3218 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3219 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3220 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3221 return true; 3222 } 3223 3224 return false; 3225} 3226 3227Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3228 MultiTemplateParamsArg TemplateParamLists) { 3229 // TODO: consider using NameInfo for diagnostic. 3230 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3231 DeclarationName Name = NameInfo.getName(); 3232 3233 // All of these full declarators require an identifier. If it doesn't have 3234 // one, the ParsedFreeStandingDeclSpec action should be used. 3235 if (!Name) { 3236 if (!D.isInvalidType()) // Reject this if we think it is valid. 3237 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3238 diag::err_declarator_need_ident) 3239 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3240 return 0; 3241 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3242 return 0; 3243 3244 // The scope passed in may not be a decl scope. Zip up the scope tree until 3245 // we find one that is. 3246 while ((S->getFlags() & Scope::DeclScope) == 0 || 3247 (S->getFlags() & Scope::TemplateParamScope) != 0) 3248 S = S->getParent(); 3249 3250 DeclContext *DC = CurContext; 3251 if (D.getCXXScopeSpec().isInvalid()) 3252 D.setInvalidType(); 3253 else if (D.getCXXScopeSpec().isSet()) { 3254 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3255 UPPC_DeclarationQualifier)) 3256 return 0; 3257 3258 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3259 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3260 if (!DC) { 3261 // If we could not compute the declaration context, it's because the 3262 // declaration context is dependent but does not refer to a class, 3263 // class template, or class template partial specialization. Complain 3264 // and return early, to avoid the coming semantic disaster. 3265 Diag(D.getIdentifierLoc(), 3266 diag::err_template_qualified_declarator_no_match) 3267 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3268 << D.getCXXScopeSpec().getRange(); 3269 return 0; 3270 } 3271 bool IsDependentContext = DC->isDependentContext(); 3272 3273 if (!IsDependentContext && 3274 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3275 return 0; 3276 3277 if (isa<CXXRecordDecl>(DC)) { 3278 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3279 Diag(D.getIdentifierLoc(), 3280 diag::err_member_def_undefined_record) 3281 << Name << DC << D.getCXXScopeSpec().getRange(); 3282 D.setInvalidType(); 3283 } else if (isa<CXXRecordDecl>(CurContext) && 3284 !D.getDeclSpec().isFriendSpecified()) { 3285 // The user provided a superfluous scope specifier inside a class 3286 // definition: 3287 // 3288 // class X { 3289 // void X::f(); 3290 // }; 3291 if (CurContext->Equals(DC)) { 3292 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3293 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3294 } else { 3295 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3296 << Name << D.getCXXScopeSpec().getRange(); 3297 3298 // C++ constructors and destructors with incorrect scopes can break 3299 // our AST invariants by having the wrong underlying types. If 3300 // that's the case, then drop this declaration entirely. 3301 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3302 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3303 !Context.hasSameType(Name.getCXXNameType(), 3304 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)))) 3305 return 0; 3306 } 3307 3308 // Pretend that this qualifier was not here. 3309 D.getCXXScopeSpec().clear(); 3310 } 3311 } 3312 3313 // Check whether we need to rebuild the type of the given 3314 // declaration in the current instantiation. 3315 if (EnteringContext && IsDependentContext && 3316 TemplateParamLists.size() != 0) { 3317 ContextRAII SavedContext(*this, DC); 3318 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3319 D.setInvalidType(); 3320 } 3321 } 3322 3323 if (DiagnoseClassNameShadow(DC, NameInfo)) 3324 // If this is a typedef, we'll end up spewing multiple diagnostics. 3325 // Just return early; it's safer. 3326 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3327 return 0; 3328 3329 NamedDecl *New; 3330 3331 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3332 QualType R = TInfo->getType(); 3333 3334 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3335 UPPC_DeclarationType)) 3336 D.setInvalidType(); 3337 3338 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3339 ForRedeclaration); 3340 3341 // See if this is a redefinition of a variable in the same scope. 3342 if (!D.getCXXScopeSpec().isSet()) { 3343 bool IsLinkageLookup = false; 3344 3345 // If the declaration we're planning to build will be a function 3346 // or object with linkage, then look for another declaration with 3347 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3348 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3349 /* Do nothing*/; 3350 else if (R->isFunctionType()) { 3351 if (CurContext->isFunctionOrMethod() || 3352 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3353 IsLinkageLookup = true; 3354 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3355 IsLinkageLookup = true; 3356 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3357 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3358 IsLinkageLookup = true; 3359 3360 if (IsLinkageLookup) 3361 Previous.clear(LookupRedeclarationWithLinkage); 3362 3363 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3364 } else { // Something like "int foo::x;" 3365 LookupQualifiedName(Previous, DC); 3366 3367 // Don't consider using declarations as previous declarations for 3368 // out-of-line members. 3369 RemoveUsingDecls(Previous); 3370 3371 // C++ 7.3.1.2p2: 3372 // Members (including explicit specializations of templates) of a named 3373 // namespace can also be defined outside that namespace by explicit 3374 // qualification of the name being defined, provided that the entity being 3375 // defined was already declared in the namespace and the definition appears 3376 // after the point of declaration in a namespace that encloses the 3377 // declarations namespace. 3378 // 3379 // Note that we only check the context at this point. We don't yet 3380 // have enough information to make sure that PrevDecl is actually 3381 // the declaration we want to match. For example, given: 3382 // 3383 // class X { 3384 // void f(); 3385 // void f(float); 3386 // }; 3387 // 3388 // void X::f(int) { } // ill-formed 3389 // 3390 // In this case, PrevDecl will point to the overload set 3391 // containing the two f's declared in X, but neither of them 3392 // matches. 3393 3394 // First check whether we named the global scope. 3395 if (isa<TranslationUnitDecl>(DC)) { 3396 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3397 << Name << D.getCXXScopeSpec().getRange(); 3398 } else { 3399 DeclContext *Cur = CurContext; 3400 while (isa<LinkageSpecDecl>(Cur)) 3401 Cur = Cur->getParent(); 3402 if (!Cur->Encloses(DC)) { 3403 // The qualifying scope doesn't enclose the original declaration. 3404 // Emit diagnostic based on current scope. 3405 SourceLocation L = D.getIdentifierLoc(); 3406 SourceRange R = D.getCXXScopeSpec().getRange(); 3407 if (isa<FunctionDecl>(Cur)) 3408 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3409 else 3410 Diag(L, diag::err_invalid_declarator_scope) 3411 << Name << cast<NamedDecl>(DC) << R; 3412 D.setInvalidType(); 3413 } 3414 3415 // C++11 8.3p1: 3416 // ... "The nested-name-specifier of the qualified declarator-id shall 3417 // not begin with a decltype-specifer" 3418 NestedNameSpecifierLoc SpecLoc = 3419 D.getCXXScopeSpec().getWithLocInContext(Context); 3420 assert(SpecLoc && "A non-empty CXXScopeSpec should have a non-empty " 3421 "NestedNameSpecifierLoc"); 3422 while (SpecLoc.getPrefix()) 3423 SpecLoc = SpecLoc.getPrefix(); 3424 if (dyn_cast_or_null<DecltypeType>( 3425 SpecLoc.getNestedNameSpecifier()->getAsType())) 3426 Diag(SpecLoc.getBeginLoc(), diag::err_decltype_in_declarator) 3427 << SpecLoc.getTypeLoc().getSourceRange(); 3428 } 3429 } 3430 3431 if (Previous.isSingleResult() && 3432 Previous.getFoundDecl()->isTemplateParameter()) { 3433 // Maybe we will complain about the shadowed template parameter. 3434 if (!D.isInvalidType()) 3435 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3436 Previous.getFoundDecl()); 3437 3438 // Just pretend that we didn't see the previous declaration. 3439 Previous.clear(); 3440 } 3441 3442 // In C++, the previous declaration we find might be a tag type 3443 // (class or enum). In this case, the new declaration will hide the 3444 // tag type. Note that this does does not apply if we're declaring a 3445 // typedef (C++ [dcl.typedef]p4). 3446 if (Previous.isSingleTagDecl() && 3447 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3448 Previous.clear(); 3449 3450 bool AddToScope = true; 3451 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3452 if (TemplateParamLists.size()) { 3453 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3454 return 0; 3455 } 3456 3457 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3458 } else if (R->isFunctionType()) { 3459 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3460 move(TemplateParamLists), 3461 AddToScope); 3462 } else { 3463 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3464 move(TemplateParamLists)); 3465 } 3466 3467 if (New == 0) 3468 return 0; 3469 3470 // If this has an identifier and is not an invalid redeclaration or 3471 // function template specialization, add it to the scope stack. 3472 if (New->getDeclName() && AddToScope && 3473 !(D.isRedeclaration() && New->isInvalidDecl())) 3474 PushOnScopeChains(New, S); 3475 3476 return New; 3477} 3478 3479/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3480/// types into constant array types in certain situations which would otherwise 3481/// be errors (for GCC compatibility). 3482static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3483 ASTContext &Context, 3484 bool &SizeIsNegative, 3485 llvm::APSInt &Oversized) { 3486 // This method tries to turn a variable array into a constant 3487 // array even when the size isn't an ICE. This is necessary 3488 // for compatibility with code that depends on gcc's buggy 3489 // constant expression folding, like struct {char x[(int)(char*)2];} 3490 SizeIsNegative = false; 3491 Oversized = 0; 3492 3493 if (T->isDependentType()) 3494 return QualType(); 3495 3496 QualifierCollector Qs; 3497 const Type *Ty = Qs.strip(T); 3498 3499 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3500 QualType Pointee = PTy->getPointeeType(); 3501 QualType FixedType = 3502 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3503 Oversized); 3504 if (FixedType.isNull()) return FixedType; 3505 FixedType = Context.getPointerType(FixedType); 3506 return Qs.apply(Context, FixedType); 3507 } 3508 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3509 QualType Inner = PTy->getInnerType(); 3510 QualType FixedType = 3511 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3512 Oversized); 3513 if (FixedType.isNull()) return FixedType; 3514 FixedType = Context.getParenType(FixedType); 3515 return Qs.apply(Context, FixedType); 3516 } 3517 3518 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3519 if (!VLATy) 3520 return QualType(); 3521 // FIXME: We should probably handle this case 3522 if (VLATy->getElementType()->isVariablyModifiedType()) 3523 return QualType(); 3524 3525 llvm::APSInt Res; 3526 if (!VLATy->getSizeExpr() || 3527 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3528 return QualType(); 3529 3530 // Check whether the array size is negative. 3531 if (Res.isSigned() && Res.isNegative()) { 3532 SizeIsNegative = true; 3533 return QualType(); 3534 } 3535 3536 // Check whether the array is too large to be addressed. 3537 unsigned ActiveSizeBits 3538 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3539 Res); 3540 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3541 Oversized = Res; 3542 return QualType(); 3543 } 3544 3545 return Context.getConstantArrayType(VLATy->getElementType(), 3546 Res, ArrayType::Normal, 0); 3547} 3548 3549/// \brief Register the given locally-scoped external C declaration so 3550/// that it can be found later for redeclarations 3551void 3552Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3553 const LookupResult &Previous, 3554 Scope *S) { 3555 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3556 "Decl is not a locally-scoped decl!"); 3557 // Note that we have a locally-scoped external with this name. 3558 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3559 3560 if (!Previous.isSingleResult()) 3561 return; 3562 3563 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3564 3565 // If there was a previous declaration of this variable, it may be 3566 // in our identifier chain. Update the identifier chain with the new 3567 // declaration. 3568 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3569 // The previous declaration was found on the identifer resolver 3570 // chain, so remove it from its scope. 3571 3572 if (S->isDeclScope(PrevDecl)) { 3573 // Special case for redeclarations in the SAME scope. 3574 // Because this declaration is going to be added to the identifier chain 3575 // later, we should temporarily take it OFF the chain. 3576 IdResolver.RemoveDecl(ND); 3577 3578 } else { 3579 // Find the scope for the original declaration. 3580 while (S && !S->isDeclScope(PrevDecl)) 3581 S = S->getParent(); 3582 } 3583 3584 if (S) 3585 S->RemoveDecl(PrevDecl); 3586 } 3587} 3588 3589llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3590Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3591 if (ExternalSource) { 3592 // Load locally-scoped external decls from the external source. 3593 SmallVector<NamedDecl *, 4> Decls; 3594 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3595 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3596 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3597 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3598 if (Pos == LocallyScopedExternalDecls.end()) 3599 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3600 } 3601 } 3602 3603 return LocallyScopedExternalDecls.find(Name); 3604} 3605 3606/// \brief Diagnose function specifiers on a declaration of an identifier that 3607/// does not identify a function. 3608void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3609 // FIXME: We should probably indicate the identifier in question to avoid 3610 // confusion for constructs like "inline int a(), b;" 3611 if (D.getDeclSpec().isInlineSpecified()) 3612 Diag(D.getDeclSpec().getInlineSpecLoc(), 3613 diag::err_inline_non_function); 3614 3615 if (D.getDeclSpec().isVirtualSpecified()) 3616 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3617 diag::err_virtual_non_function); 3618 3619 if (D.getDeclSpec().isExplicitSpecified()) 3620 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3621 diag::err_explicit_non_function); 3622} 3623 3624NamedDecl* 3625Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3626 TypeSourceInfo *TInfo, LookupResult &Previous) { 3627 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3628 if (D.getCXXScopeSpec().isSet()) { 3629 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3630 << D.getCXXScopeSpec().getRange(); 3631 D.setInvalidType(); 3632 // Pretend we didn't see the scope specifier. 3633 DC = CurContext; 3634 Previous.clear(); 3635 } 3636 3637 if (getLangOptions().CPlusPlus) { 3638 // Check that there are no default arguments (C++ only). 3639 CheckExtraCXXDefaultArguments(D); 3640 } 3641 3642 DiagnoseFunctionSpecifiers(D); 3643 3644 if (D.getDeclSpec().isThreadSpecified()) 3645 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3646 if (D.getDeclSpec().isConstexprSpecified()) 3647 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3648 << 1; 3649 3650 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3651 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3652 << D.getName().getSourceRange(); 3653 return 0; 3654 } 3655 3656 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3657 if (!NewTD) return 0; 3658 3659 // Handle attributes prior to checking for duplicates in MergeVarDecl 3660 ProcessDeclAttributes(S, NewTD, D); 3661 3662 CheckTypedefForVariablyModifiedType(S, NewTD); 3663 3664 bool Redeclaration = D.isRedeclaration(); 3665 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3666 D.setRedeclaration(Redeclaration); 3667 return ND; 3668} 3669 3670void 3671Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3672 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3673 // then it shall have block scope. 3674 // Note that variably modified types must be fixed before merging the decl so 3675 // that redeclarations will match. 3676 QualType T = NewTD->getUnderlyingType(); 3677 if (T->isVariablyModifiedType()) { 3678 getCurFunction()->setHasBranchProtectedScope(); 3679 3680 if (S->getFnParent() == 0) { 3681 bool SizeIsNegative; 3682 llvm::APSInt Oversized; 3683 QualType FixedTy = 3684 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3685 Oversized); 3686 if (!FixedTy.isNull()) { 3687 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3688 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3689 } else { 3690 if (SizeIsNegative) 3691 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3692 else if (T->isVariableArrayType()) 3693 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3694 else if (Oversized.getBoolValue()) 3695 Diag(NewTD->getLocation(), diag::err_array_too_large) 3696 << Oversized.toString(10); 3697 else 3698 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3699 NewTD->setInvalidDecl(); 3700 } 3701 } 3702 } 3703} 3704 3705 3706/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3707/// declares a typedef-name, either using the 'typedef' type specifier or via 3708/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3709NamedDecl* 3710Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3711 LookupResult &Previous, bool &Redeclaration) { 3712 // Merge the decl with the existing one if appropriate. If the decl is 3713 // in an outer scope, it isn't the same thing. 3714 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3715 /*ExplicitInstantiationOrSpecialization=*/false); 3716 if (!Previous.empty()) { 3717 Redeclaration = true; 3718 MergeTypedefNameDecl(NewTD, Previous); 3719 } 3720 3721 // If this is the C FILE type, notify the AST context. 3722 if (IdentifierInfo *II = NewTD->getIdentifier()) 3723 if (!NewTD->isInvalidDecl() && 3724 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3725 if (II->isStr("FILE")) 3726 Context.setFILEDecl(NewTD); 3727 else if (II->isStr("jmp_buf")) 3728 Context.setjmp_bufDecl(NewTD); 3729 else if (II->isStr("sigjmp_buf")) 3730 Context.setsigjmp_bufDecl(NewTD); 3731 else if (II->isStr("ucontext_t")) 3732 Context.setucontext_tDecl(NewTD); 3733 else if (II->isStr("__builtin_va_list")) 3734 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3735 } 3736 3737 return NewTD; 3738} 3739 3740/// \brief Determines whether the given declaration is an out-of-scope 3741/// previous declaration. 3742/// 3743/// This routine should be invoked when name lookup has found a 3744/// previous declaration (PrevDecl) that is not in the scope where a 3745/// new declaration by the same name is being introduced. If the new 3746/// declaration occurs in a local scope, previous declarations with 3747/// linkage may still be considered previous declarations (C99 3748/// 6.2.2p4-5, C++ [basic.link]p6). 3749/// 3750/// \param PrevDecl the previous declaration found by name 3751/// lookup 3752/// 3753/// \param DC the context in which the new declaration is being 3754/// declared. 3755/// 3756/// \returns true if PrevDecl is an out-of-scope previous declaration 3757/// for a new delcaration with the same name. 3758static bool 3759isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3760 ASTContext &Context) { 3761 if (!PrevDecl) 3762 return false; 3763 3764 if (!PrevDecl->hasLinkage()) 3765 return false; 3766 3767 if (Context.getLangOptions().CPlusPlus) { 3768 // C++ [basic.link]p6: 3769 // If there is a visible declaration of an entity with linkage 3770 // having the same name and type, ignoring entities declared 3771 // outside the innermost enclosing namespace scope, the block 3772 // scope declaration declares that same entity and receives the 3773 // linkage of the previous declaration. 3774 DeclContext *OuterContext = DC->getRedeclContext(); 3775 if (!OuterContext->isFunctionOrMethod()) 3776 // This rule only applies to block-scope declarations. 3777 return false; 3778 3779 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3780 if (PrevOuterContext->isRecord()) 3781 // We found a member function: ignore it. 3782 return false; 3783 3784 // Find the innermost enclosing namespace for the new and 3785 // previous declarations. 3786 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3787 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3788 3789 // The previous declaration is in a different namespace, so it 3790 // isn't the same function. 3791 if (!OuterContext->Equals(PrevOuterContext)) 3792 return false; 3793 } 3794 3795 return true; 3796} 3797 3798static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3799 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3800 if (!SS.isSet()) return; 3801 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3802} 3803 3804bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3805 QualType type = decl->getType(); 3806 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3807 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3808 // Various kinds of declaration aren't allowed to be __autoreleasing. 3809 unsigned kind = -1U; 3810 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3811 if (var->hasAttr<BlocksAttr>()) 3812 kind = 0; // __block 3813 else if (!var->hasLocalStorage()) 3814 kind = 1; // global 3815 } else if (isa<ObjCIvarDecl>(decl)) { 3816 kind = 3; // ivar 3817 } else if (isa<FieldDecl>(decl)) { 3818 kind = 2; // field 3819 } 3820 3821 if (kind != -1U) { 3822 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3823 << kind; 3824 } 3825 } else if (lifetime == Qualifiers::OCL_None) { 3826 // Try to infer lifetime. 3827 if (!type->isObjCLifetimeType()) 3828 return false; 3829 3830 lifetime = type->getObjCARCImplicitLifetime(); 3831 type = Context.getLifetimeQualifiedType(type, lifetime); 3832 decl->setType(type); 3833 } 3834 3835 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3836 // Thread-local variables cannot have lifetime. 3837 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3838 var->isThreadSpecified()) { 3839 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3840 << var->getType(); 3841 return true; 3842 } 3843 } 3844 3845 return false; 3846} 3847 3848NamedDecl* 3849Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3850 TypeSourceInfo *TInfo, LookupResult &Previous, 3851 MultiTemplateParamsArg TemplateParamLists) { 3852 QualType R = TInfo->getType(); 3853 DeclarationName Name = GetNameForDeclarator(D).getName(); 3854 3855 // Check that there are no default arguments (C++ only). 3856 if (getLangOptions().CPlusPlus) 3857 CheckExtraCXXDefaultArguments(D); 3858 3859 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3860 assert(SCSpec != DeclSpec::SCS_typedef && 3861 "Parser allowed 'typedef' as storage class VarDecl."); 3862 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3863 if (SCSpec == DeclSpec::SCS_mutable) { 3864 // mutable can only appear on non-static class members, so it's always 3865 // an error here 3866 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3867 D.setInvalidType(); 3868 SC = SC_None; 3869 } 3870 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3871 VarDecl::StorageClass SCAsWritten 3872 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3873 3874 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3875 if (!II) { 3876 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3877 << Name; 3878 return 0; 3879 } 3880 3881 DiagnoseFunctionSpecifiers(D); 3882 3883 if (!DC->isRecord() && S->getFnParent() == 0) { 3884 // C99 6.9p2: The storage-class specifiers auto and register shall not 3885 // appear in the declaration specifiers in an external declaration. 3886 if (SC == SC_Auto || SC == SC_Register) { 3887 3888 // If this is a register variable with an asm label specified, then this 3889 // is a GNU extension. 3890 if (SC == SC_Register && D.getAsmLabel()) 3891 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3892 else 3893 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3894 D.setInvalidType(); 3895 } 3896 } 3897 3898 if (getLangOptions().OpenCL) { 3899 // Set up the special work-group-local storage class for variables in the 3900 // OpenCL __local address space. 3901 if (R.getAddressSpace() == LangAS::opencl_local) 3902 SC = SC_OpenCLWorkGroupLocal; 3903 } 3904 3905 bool isExplicitSpecialization = false; 3906 VarDecl *NewVD; 3907 if (!getLangOptions().CPlusPlus) { 3908 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3909 D.getIdentifierLoc(), II, 3910 R, TInfo, SC, SCAsWritten); 3911 3912 if (D.isInvalidType()) 3913 NewVD->setInvalidDecl(); 3914 } else { 3915 if (DC->isRecord() && !CurContext->isRecord()) { 3916 // This is an out-of-line definition of a static data member. 3917 if (SC == SC_Static) { 3918 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3919 diag::err_static_out_of_line) 3920 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3921 } else if (SC == SC_None) 3922 SC = SC_Static; 3923 } 3924 if (SC == SC_Static) { 3925 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3926 if (RD->isLocalClass()) 3927 Diag(D.getIdentifierLoc(), 3928 diag::err_static_data_member_not_allowed_in_local_class) 3929 << Name << RD->getDeclName(); 3930 3931 // C++ [class.union]p1: If a union contains a static data member, 3932 // the program is ill-formed. 3933 // 3934 // We also disallow static data members in anonymous structs. 3935 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3936 Diag(D.getIdentifierLoc(), 3937 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3938 << Name << RD->isUnion(); 3939 } 3940 } 3941 3942 // Match up the template parameter lists with the scope specifier, then 3943 // determine whether we have a template or a template specialization. 3944 isExplicitSpecialization = false; 3945 bool Invalid = false; 3946 if (TemplateParameterList *TemplateParams 3947 = MatchTemplateParametersToScopeSpecifier( 3948 D.getDeclSpec().getSourceRange().getBegin(), 3949 D.getIdentifierLoc(), 3950 D.getCXXScopeSpec(), 3951 TemplateParamLists.get(), 3952 TemplateParamLists.size(), 3953 /*never a friend*/ false, 3954 isExplicitSpecialization, 3955 Invalid)) { 3956 if (TemplateParams->size() > 0) { 3957 // There is no such thing as a variable template. 3958 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3959 << II 3960 << SourceRange(TemplateParams->getTemplateLoc(), 3961 TemplateParams->getRAngleLoc()); 3962 return 0; 3963 } else { 3964 // There is an extraneous 'template<>' for this variable. Complain 3965 // about it, but allow the declaration of the variable. 3966 Diag(TemplateParams->getTemplateLoc(), 3967 diag::err_template_variable_noparams) 3968 << II 3969 << SourceRange(TemplateParams->getTemplateLoc(), 3970 TemplateParams->getRAngleLoc()); 3971 } 3972 } 3973 3974 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3975 D.getIdentifierLoc(), II, 3976 R, TInfo, SC, SCAsWritten); 3977 3978 // If this decl has an auto type in need of deduction, make a note of the 3979 // Decl so we can diagnose uses of it in its own initializer. 3980 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3981 R->getContainedAutoType()) 3982 ParsingInitForAutoVars.insert(NewVD); 3983 3984 if (D.isInvalidType() || Invalid) 3985 NewVD->setInvalidDecl(); 3986 3987 SetNestedNameSpecifier(NewVD, D); 3988 3989 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3990 NewVD->setTemplateParameterListsInfo(Context, 3991 TemplateParamLists.size(), 3992 TemplateParamLists.release()); 3993 } 3994 3995 if (D.getDeclSpec().isConstexprSpecified()) 3996 NewVD->setConstexpr(true); 3997 } 3998 3999 // Set the lexical context. If the declarator has a C++ scope specifier, the 4000 // lexical context will be different from the semantic context. 4001 NewVD->setLexicalDeclContext(CurContext); 4002 4003 if (D.getDeclSpec().isThreadSpecified()) { 4004 if (NewVD->hasLocalStorage()) 4005 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 4006 else if (!Context.getTargetInfo().isTLSSupported()) 4007 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 4008 else 4009 NewVD->setThreadSpecified(true); 4010 } 4011 4012 if (D.getDeclSpec().isModulePrivateSpecified()) { 4013 if (isExplicitSpecialization) 4014 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 4015 << 2 4016 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4017 else if (NewVD->hasLocalStorage()) 4018 Diag(NewVD->getLocation(), diag::err_module_private_local) 4019 << 0 << NewVD->getDeclName() 4020 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 4021 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4022 else 4023 NewVD->setModulePrivate(); 4024 } 4025 4026 // Handle attributes prior to checking for duplicates in MergeVarDecl 4027 ProcessDeclAttributes(S, NewVD, D); 4028 4029 // In auto-retain/release, infer strong retension for variables of 4030 // retainable type. 4031 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4032 NewVD->setInvalidDecl(); 4033 4034 // Handle GNU asm-label extension (encoded as an attribute). 4035 if (Expr *E = (Expr*)D.getAsmLabel()) { 4036 // The parser guarantees this is a string. 4037 StringLiteral *SE = cast<StringLiteral>(E); 4038 StringRef Label = SE->getString(); 4039 if (S->getFnParent() != 0) { 4040 switch (SC) { 4041 case SC_None: 4042 case SC_Auto: 4043 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4044 break; 4045 case SC_Register: 4046 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4047 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4048 break; 4049 case SC_Static: 4050 case SC_Extern: 4051 case SC_PrivateExtern: 4052 case SC_OpenCLWorkGroupLocal: 4053 break; 4054 } 4055 } 4056 4057 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4058 Context, Label)); 4059 } 4060 4061 // Diagnose shadowed variables before filtering for scope. 4062 if (!D.getCXXScopeSpec().isSet()) 4063 CheckShadow(S, NewVD, Previous); 4064 4065 // Don't consider existing declarations that are in a different 4066 // scope and are out-of-semantic-context declarations (if the new 4067 // declaration has linkage). 4068 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4069 isExplicitSpecialization); 4070 4071 if (!getLangOptions().CPlusPlus) { 4072 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4073 } else { 4074 // Merge the decl with the existing one if appropriate. 4075 if (!Previous.empty()) { 4076 if (Previous.isSingleResult() && 4077 isa<FieldDecl>(Previous.getFoundDecl()) && 4078 D.getCXXScopeSpec().isSet()) { 4079 // The user tried to define a non-static data member 4080 // out-of-line (C++ [dcl.meaning]p1). 4081 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4082 << D.getCXXScopeSpec().getRange(); 4083 Previous.clear(); 4084 NewVD->setInvalidDecl(); 4085 } 4086 } else if (D.getCXXScopeSpec().isSet()) { 4087 // No previous declaration in the qualifying scope. 4088 Diag(D.getIdentifierLoc(), diag::err_no_member) 4089 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4090 << D.getCXXScopeSpec().getRange(); 4091 NewVD->setInvalidDecl(); 4092 } 4093 4094 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4095 4096 // This is an explicit specialization of a static data member. Check it. 4097 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4098 CheckMemberSpecialization(NewVD, Previous)) 4099 NewVD->setInvalidDecl(); 4100 } 4101 4102 // attributes declared post-definition are currently ignored 4103 // FIXME: This should be handled in attribute merging, not 4104 // here. 4105 if (Previous.isSingleResult()) { 4106 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4107 if (Def && (Def = Def->getDefinition()) && 4108 Def != NewVD && D.hasAttributes()) { 4109 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4110 Diag(Def->getLocation(), diag::note_previous_definition); 4111 } 4112 } 4113 4114 // If this is a locally-scoped extern C variable, update the map of 4115 // such variables. 4116 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4117 !NewVD->isInvalidDecl()) 4118 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4119 4120 // If there's a #pragma GCC visibility in scope, and this isn't a class 4121 // member, set the visibility of this variable. 4122 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4123 AddPushedVisibilityAttribute(NewVD); 4124 4125 MarkUnusedFileScopedDecl(NewVD); 4126 4127 return NewVD; 4128} 4129 4130/// \brief Diagnose variable or built-in function shadowing. Implements 4131/// -Wshadow. 4132/// 4133/// This method is called whenever a VarDecl is added to a "useful" 4134/// scope. 4135/// 4136/// \param S the scope in which the shadowing name is being declared 4137/// \param R the lookup of the name 4138/// 4139void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4140 // Return if warning is ignored. 4141 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4142 DiagnosticsEngine::Ignored) 4143 return; 4144 4145 // Don't diagnose declarations at file scope. 4146 if (D->hasGlobalStorage()) 4147 return; 4148 4149 DeclContext *NewDC = D->getDeclContext(); 4150 4151 // Only diagnose if we're shadowing an unambiguous field or variable. 4152 if (R.getResultKind() != LookupResult::Found) 4153 return; 4154 4155 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4156 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4157 return; 4158 4159 // Fields are not shadowed by variables in C++ static methods. 4160 if (isa<FieldDecl>(ShadowedDecl)) 4161 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4162 if (MD->isStatic()) 4163 return; 4164 4165 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4166 if (shadowedVar->isExternC()) { 4167 // For shadowing external vars, make sure that we point to the global 4168 // declaration, not a locally scoped extern declaration. 4169 for (VarDecl::redecl_iterator 4170 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4171 I != E; ++I) 4172 if (I->isFileVarDecl()) { 4173 ShadowedDecl = *I; 4174 break; 4175 } 4176 } 4177 4178 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4179 4180 // Only warn about certain kinds of shadowing for class members. 4181 if (NewDC && NewDC->isRecord()) { 4182 // In particular, don't warn about shadowing non-class members. 4183 if (!OldDC->isRecord()) 4184 return; 4185 4186 // TODO: should we warn about static data members shadowing 4187 // static data members from base classes? 4188 4189 // TODO: don't diagnose for inaccessible shadowed members. 4190 // This is hard to do perfectly because we might friend the 4191 // shadowing context, but that's just a false negative. 4192 } 4193 4194 // Determine what kind of declaration we're shadowing. 4195 unsigned Kind; 4196 if (isa<RecordDecl>(OldDC)) { 4197 if (isa<FieldDecl>(ShadowedDecl)) 4198 Kind = 3; // field 4199 else 4200 Kind = 2; // static data member 4201 } else if (OldDC->isFileContext()) 4202 Kind = 1; // global 4203 else 4204 Kind = 0; // local 4205 4206 DeclarationName Name = R.getLookupName(); 4207 4208 // Emit warning and note. 4209 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4210 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4211} 4212 4213/// \brief Check -Wshadow without the advantage of a previous lookup. 4214void Sema::CheckShadow(Scope *S, VarDecl *D) { 4215 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4216 DiagnosticsEngine::Ignored) 4217 return; 4218 4219 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4220 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4221 LookupName(R, S); 4222 CheckShadow(S, D, R); 4223} 4224 4225/// \brief Perform semantic checking on a newly-created variable 4226/// declaration. 4227/// 4228/// This routine performs all of the type-checking required for a 4229/// variable declaration once it has been built. It is used both to 4230/// check variables after they have been parsed and their declarators 4231/// have been translated into a declaration, and to check variables 4232/// that have been instantiated from a template. 4233/// 4234/// Sets NewVD->isInvalidDecl() if an error was encountered. 4235/// 4236/// Returns true if the variable declaration is a redeclaration. 4237bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4238 LookupResult &Previous) { 4239 // If the decl is already known invalid, don't check it. 4240 if (NewVD->isInvalidDecl()) 4241 return false; 4242 4243 QualType T = NewVD->getType(); 4244 4245 if (T->isObjCObjectType()) { 4246 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4247 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4248 T = Context.getObjCObjectPointerType(T); 4249 NewVD->setType(T); 4250 } 4251 4252 // Emit an error if an address space was applied to decl with local storage. 4253 // This includes arrays of objects with address space qualifiers, but not 4254 // automatic variables that point to other address spaces. 4255 // ISO/IEC TR 18037 S5.1.2 4256 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4257 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4258 NewVD->setInvalidDecl(); 4259 return false; 4260 } 4261 4262 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4263 && !NewVD->hasAttr<BlocksAttr>()) { 4264 if (getLangOptions().getGC() != LangOptions::NonGC) 4265 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4266 else 4267 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4268 } 4269 4270 bool isVM = T->isVariablyModifiedType(); 4271 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4272 NewVD->hasAttr<BlocksAttr>()) 4273 getCurFunction()->setHasBranchProtectedScope(); 4274 4275 if ((isVM && NewVD->hasLinkage()) || 4276 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4277 bool SizeIsNegative; 4278 llvm::APSInt Oversized; 4279 QualType FixedTy = 4280 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4281 Oversized); 4282 4283 if (FixedTy.isNull() && T->isVariableArrayType()) { 4284 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4285 // FIXME: This won't give the correct result for 4286 // int a[10][n]; 4287 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4288 4289 if (NewVD->isFileVarDecl()) 4290 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4291 << SizeRange; 4292 else if (NewVD->getStorageClass() == SC_Static) 4293 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4294 << SizeRange; 4295 else 4296 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4297 << SizeRange; 4298 NewVD->setInvalidDecl(); 4299 return false; 4300 } 4301 4302 if (FixedTy.isNull()) { 4303 if (NewVD->isFileVarDecl()) 4304 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4305 else 4306 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4307 NewVD->setInvalidDecl(); 4308 return false; 4309 } 4310 4311 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4312 NewVD->setType(FixedTy); 4313 } 4314 4315 if (Previous.empty() && NewVD->isExternC()) { 4316 // Since we did not find anything by this name and we're declaring 4317 // an extern "C" variable, look for a non-visible extern "C" 4318 // declaration with the same name. 4319 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4320 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4321 if (Pos != LocallyScopedExternalDecls.end()) 4322 Previous.addDecl(Pos->second); 4323 } 4324 4325 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4326 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4327 << T; 4328 NewVD->setInvalidDecl(); 4329 return false; 4330 } 4331 4332 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4333 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4334 NewVD->setInvalidDecl(); 4335 return false; 4336 } 4337 4338 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4339 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4340 NewVD->setInvalidDecl(); 4341 return false; 4342 } 4343 4344 // Function pointers and references cannot have qualified function type, only 4345 // function pointer-to-members can do that. 4346 QualType Pointee; 4347 unsigned PtrOrRef = 0; 4348 if (const PointerType *Ptr = T->getAs<PointerType>()) 4349 Pointee = Ptr->getPointeeType(); 4350 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4351 Pointee = Ref->getPointeeType(); 4352 PtrOrRef = 1; 4353 } 4354 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4355 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4356 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4357 << PtrOrRef; 4358 NewVD->setInvalidDecl(); 4359 return false; 4360 } 4361 4362 if (!Previous.empty()) { 4363 MergeVarDecl(NewVD, Previous); 4364 return true; 4365 } 4366 return false; 4367} 4368 4369/// \brief Data used with FindOverriddenMethod 4370struct FindOverriddenMethodData { 4371 Sema *S; 4372 CXXMethodDecl *Method; 4373}; 4374 4375/// \brief Member lookup function that determines whether a given C++ 4376/// method overrides a method in a base class, to be used with 4377/// CXXRecordDecl::lookupInBases(). 4378static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4379 CXXBasePath &Path, 4380 void *UserData) { 4381 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4382 4383 FindOverriddenMethodData *Data 4384 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4385 4386 DeclarationName Name = Data->Method->getDeclName(); 4387 4388 // FIXME: Do we care about other names here too? 4389 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4390 // We really want to find the base class destructor here. 4391 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4392 CanQualType CT = Data->S->Context.getCanonicalType(T); 4393 4394 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4395 } 4396 4397 for (Path.Decls = BaseRecord->lookup(Name); 4398 Path.Decls.first != Path.Decls.second; 4399 ++Path.Decls.first) { 4400 NamedDecl *D = *Path.Decls.first; 4401 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4402 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4403 return true; 4404 } 4405 } 4406 4407 return false; 4408} 4409 4410/// AddOverriddenMethods - See if a method overrides any in the base classes, 4411/// and if so, check that it's a valid override and remember it. 4412bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4413 // Look for virtual methods in base classes that this method might override. 4414 CXXBasePaths Paths; 4415 FindOverriddenMethodData Data; 4416 Data.Method = MD; 4417 Data.S = this; 4418 bool AddedAny = false; 4419 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4420 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4421 E = Paths.found_decls_end(); I != E; ++I) { 4422 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4423 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4424 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4425 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4426 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4427 AddedAny = true; 4428 } 4429 } 4430 } 4431 } 4432 4433 return AddedAny; 4434} 4435 4436namespace { 4437 // Struct for holding all of the extra arguments needed by 4438 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4439 struct ActOnFDArgs { 4440 Scope *S; 4441 Declarator &D; 4442 MultiTemplateParamsArg TemplateParamLists; 4443 bool AddToScope; 4444 }; 4445} 4446 4447namespace { 4448 4449// Callback to only accept typo corrections that have a non-zero edit distance. 4450class DifferentNameValidatorCCC : public CorrectionCandidateCallback { 4451 public: 4452 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 4453 return candidate.getEditDistance() > 0; 4454 } 4455}; 4456 4457} 4458 4459/// \brief Generate diagnostics for an invalid function redeclaration. 4460/// 4461/// This routine handles generating the diagnostic messages for an invalid 4462/// function redeclaration, including finding possible similar declarations 4463/// or performing typo correction if there are no previous declarations with 4464/// the same name. 4465/// 4466/// Returns a NamedDecl iff typo correction was performed and substituting in 4467/// the new declaration name does not cause new errors. 4468static NamedDecl* DiagnoseInvalidRedeclaration( 4469 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4470 ActOnFDArgs &ExtraArgs) { 4471 NamedDecl *Result = NULL; 4472 DeclarationName Name = NewFD->getDeclName(); 4473 DeclContext *NewDC = NewFD->getDeclContext(); 4474 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4475 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4476 llvm::SmallVector<unsigned, 1> MismatchedParams; 4477 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4478 TypoCorrection Correction; 4479 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4480 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4481 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4482 : diag::err_member_def_does_not_match; 4483 4484 NewFD->setInvalidDecl(); 4485 SemaRef.LookupQualifiedName(Prev, NewDC); 4486 assert(!Prev.isAmbiguous() && 4487 "Cannot have an ambiguity in previous-declaration lookup"); 4488 DifferentNameValidatorCCC Validator; 4489 if (!Prev.empty()) { 4490 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4491 Func != FuncEnd; ++Func) { 4492 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4493 if (FD && 4494 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4495 // Add 1 to the index so that 0 can mean the mismatch didn't 4496 // involve a parameter 4497 unsigned ParamNum = 4498 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4499 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4500 } 4501 } 4502 // If the qualified name lookup yielded nothing, try typo correction 4503 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4504 Prev.getLookupKind(), 0, 0, 4505 Validator, NewDC))) { 4506 // Trap errors. 4507 Sema::SFINAETrap Trap(SemaRef); 4508 4509 // Set up everything for the call to ActOnFunctionDeclarator 4510 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4511 ExtraArgs.D.getIdentifierLoc()); 4512 Previous.clear(); 4513 Previous.setLookupName(Correction.getCorrection()); 4514 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4515 CDeclEnd = Correction.end(); 4516 CDecl != CDeclEnd; ++CDecl) { 4517 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4518 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4519 MismatchedParams)) { 4520 Previous.addDecl(FD); 4521 } 4522 } 4523 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4524 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4525 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4526 // eliminate the need for the parameter pack ExtraArgs. 4527 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4528 NewFD->getDeclContext(), 4529 NewFD->getTypeSourceInfo(), 4530 Previous, 4531 ExtraArgs.TemplateParamLists, 4532 ExtraArgs.AddToScope); 4533 if (Trap.hasErrorOccurred()) { 4534 // Pretend the typo correction never occurred 4535 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4536 ExtraArgs.D.getIdentifierLoc()); 4537 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4538 Previous.clear(); 4539 Previous.setLookupName(Name); 4540 Result = NULL; 4541 } else { 4542 for (LookupResult::iterator Func = Previous.begin(), 4543 FuncEnd = Previous.end(); 4544 Func != FuncEnd; ++Func) { 4545 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4546 NearMatches.push_back(std::make_pair(FD, 0)); 4547 } 4548 } 4549 if (NearMatches.empty()) { 4550 // Ignore the correction if it didn't yield any close FunctionDecl matches 4551 Correction = TypoCorrection(); 4552 } else { 4553 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4554 : diag::err_member_def_does_not_match_suggest; 4555 } 4556 } 4557 4558 if (Correction) 4559 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4560 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4561 << FixItHint::CreateReplacement( 4562 NewFD->getLocation(), 4563 Correction.getAsString(SemaRef.getLangOptions())); 4564 else 4565 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4566 << Name << NewDC << NewFD->getLocation(); 4567 4568 bool NewFDisConst = false; 4569 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4570 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4571 4572 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4573 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4574 NearMatch != NearMatchEnd; ++NearMatch) { 4575 FunctionDecl *FD = NearMatch->first; 4576 bool FDisConst = false; 4577 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4578 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4579 4580 if (unsigned Idx = NearMatch->second) { 4581 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4582 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4583 diag::note_member_def_close_param_match) 4584 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4585 } else if (Correction) { 4586 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4587 << Correction.getQuoted(SemaRef.getLangOptions()); 4588 } else if (FDisConst != NewFDisConst) { 4589 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4590 << NewFDisConst << FD->getSourceRange().getEnd(); 4591 } else 4592 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4593 } 4594 return Result; 4595} 4596 4597static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4598 Declarator &D) { 4599 switch (D.getDeclSpec().getStorageClassSpec()) { 4600 default: llvm_unreachable("Unknown storage class!"); 4601 case DeclSpec::SCS_auto: 4602 case DeclSpec::SCS_register: 4603 case DeclSpec::SCS_mutable: 4604 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4605 diag::err_typecheck_sclass_func); 4606 D.setInvalidType(); 4607 break; 4608 case DeclSpec::SCS_unspecified: break; 4609 case DeclSpec::SCS_extern: return SC_Extern; 4610 case DeclSpec::SCS_static: { 4611 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4612 // C99 6.7.1p5: 4613 // The declaration of an identifier for a function that has 4614 // block scope shall have no explicit storage-class specifier 4615 // other than extern 4616 // See also (C++ [dcl.stc]p4). 4617 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4618 diag::err_static_block_func); 4619 break; 4620 } else 4621 return SC_Static; 4622 } 4623 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4624 } 4625 4626 // No explicit storage class has already been returned 4627 return SC_None; 4628} 4629 4630static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4631 DeclContext *DC, QualType &R, 4632 TypeSourceInfo *TInfo, 4633 FunctionDecl::StorageClass SC, 4634 bool &IsVirtualOkay) { 4635 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4636 DeclarationName Name = NameInfo.getName(); 4637 4638 FunctionDecl *NewFD = 0; 4639 bool isInline = D.getDeclSpec().isInlineSpecified(); 4640 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4641 FunctionDecl::StorageClass SCAsWritten 4642 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4643 4644 if (!SemaRef.getLangOptions().CPlusPlus) { 4645 // Determine whether the function was written with a 4646 // prototype. This true when: 4647 // - there is a prototype in the declarator, or 4648 // - the type R of the function is some kind of typedef or other reference 4649 // to a type name (which eventually refers to a function type). 4650 bool HasPrototype = 4651 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4652 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4653 4654 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4655 D.getSourceRange().getBegin(), NameInfo, R, 4656 TInfo, SC, SCAsWritten, isInline, 4657 HasPrototype); 4658 if (D.isInvalidType()) 4659 NewFD->setInvalidDecl(); 4660 4661 // Set the lexical context. 4662 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4663 4664 return NewFD; 4665 } 4666 4667 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4668 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4669 4670 // Check that the return type is not an abstract class type. 4671 // For record types, this is done by the AbstractClassUsageDiagnoser once 4672 // the class has been completely parsed. 4673 if (!DC->isRecord() && 4674 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4675 R->getAs<FunctionType>()->getResultType(), 4676 diag::err_abstract_type_in_decl, 4677 SemaRef.AbstractReturnType)) 4678 D.setInvalidType(); 4679 4680 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4681 // This is a C++ constructor declaration. 4682 assert(DC->isRecord() && 4683 "Constructors can only be declared in a member context"); 4684 4685 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4686 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4687 D.getSourceRange().getBegin(), NameInfo, 4688 R, TInfo, isExplicit, isInline, 4689 /*isImplicitlyDeclared=*/false, 4690 isConstexpr); 4691 4692 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4693 // This is a C++ destructor declaration. 4694 if (DC->isRecord()) { 4695 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4696 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4697 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4698 SemaRef.Context, Record, 4699 D.getSourceRange().getBegin(), 4700 NameInfo, R, TInfo, isInline, 4701 /*isImplicitlyDeclared=*/false); 4702 4703 // If the class is complete, then we now create the implicit exception 4704 // specification. If the class is incomplete or dependent, we can't do 4705 // it yet. 4706 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4707 Record->getDefinition() && !Record->isBeingDefined() && 4708 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4709 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4710 } 4711 4712 IsVirtualOkay = true; 4713 return NewDD; 4714 4715 } else { 4716 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4717 D.setInvalidType(); 4718 4719 // Create a FunctionDecl to satisfy the function definition parsing 4720 // code path. 4721 return FunctionDecl::Create(SemaRef.Context, DC, 4722 D.getSourceRange().getBegin(), 4723 D.getIdentifierLoc(), Name, R, TInfo, 4724 SC, SCAsWritten, isInline, 4725 /*hasPrototype=*/true, isConstexpr); 4726 } 4727 4728 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4729 if (!DC->isRecord()) { 4730 SemaRef.Diag(D.getIdentifierLoc(), 4731 diag::err_conv_function_not_member); 4732 return 0; 4733 } 4734 4735 SemaRef.CheckConversionDeclarator(D, R, SC); 4736 IsVirtualOkay = true; 4737 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4738 D.getSourceRange().getBegin(), NameInfo, 4739 R, TInfo, isInline, isExplicit, 4740 isConstexpr, SourceLocation()); 4741 4742 } else if (DC->isRecord()) { 4743 // If the name of the function is the same as the name of the record, 4744 // then this must be an invalid constructor that has a return type. 4745 // (The parser checks for a return type and makes the declarator a 4746 // constructor if it has no return type). 4747 if (Name.getAsIdentifierInfo() && 4748 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4749 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4750 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4751 << SourceRange(D.getIdentifierLoc()); 4752 return 0; 4753 } 4754 4755 bool isStatic = SC == SC_Static; 4756 4757 // [class.free]p1: 4758 // Any allocation function for a class T is a static member 4759 // (even if not explicitly declared static). 4760 if (Name.getCXXOverloadedOperator() == OO_New || 4761 Name.getCXXOverloadedOperator() == OO_Array_New) 4762 isStatic = true; 4763 4764 // [class.free]p6 Any deallocation function for a class X is a static member 4765 // (even if not explicitly declared static). 4766 if (Name.getCXXOverloadedOperator() == OO_Delete || 4767 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4768 isStatic = true; 4769 4770 IsVirtualOkay = !isStatic; 4771 4772 // This is a C++ method declaration. 4773 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4774 D.getSourceRange().getBegin(), NameInfo, R, 4775 TInfo, isStatic, SCAsWritten, isInline, 4776 isConstexpr, SourceLocation()); 4777 4778 } else { 4779 // Determine whether the function was written with a 4780 // prototype. This true when: 4781 // - we're in C++ (where every function has a prototype), 4782 return FunctionDecl::Create(SemaRef.Context, DC, 4783 D.getSourceRange().getBegin(), 4784 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4785 true/*HasPrototype*/, isConstexpr); 4786 } 4787} 4788 4789NamedDecl* 4790Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4791 TypeSourceInfo *TInfo, LookupResult &Previous, 4792 MultiTemplateParamsArg TemplateParamLists, 4793 bool &AddToScope) { 4794 QualType R = TInfo->getType(); 4795 4796 assert(R.getTypePtr()->isFunctionType()); 4797 4798 // TODO: consider using NameInfo for diagnostic. 4799 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4800 DeclarationName Name = NameInfo.getName(); 4801 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4802 4803 if (D.getDeclSpec().isThreadSpecified()) 4804 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4805 4806 // Do not allow returning a objc interface by-value. 4807 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4808 Diag(D.getIdentifierLoc(), 4809 diag::err_object_cannot_be_passed_returned_by_value) << 0 4810 << R->getAs<FunctionType>()->getResultType() 4811 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4812 4813 QualType T = R->getAs<FunctionType>()->getResultType(); 4814 T = Context.getObjCObjectPointerType(T); 4815 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4816 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4817 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4818 FPT->getNumArgs(), EPI); 4819 } 4820 else if (isa<FunctionNoProtoType>(R)) 4821 R = Context.getFunctionNoProtoType(T); 4822 } 4823 4824 bool isFriend = false; 4825 FunctionTemplateDecl *FunctionTemplate = 0; 4826 bool isExplicitSpecialization = false; 4827 bool isFunctionTemplateSpecialization = false; 4828 bool isDependentClassScopeExplicitSpecialization = false; 4829 bool isVirtualOkay = false; 4830 4831 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4832 isVirtualOkay); 4833 if (!NewFD) return 0; 4834 4835 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 4836 NewFD->setTopLevelDeclInObjCContainer(); 4837 4838 if (getLangOptions().CPlusPlus) { 4839 bool isInline = D.getDeclSpec().isInlineSpecified(); 4840 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4841 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4842 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4843 isFriend = D.getDeclSpec().isFriendSpecified(); 4844 if (isFriend && !isInline && D.isFunctionDefinition()) { 4845 // C++ [class.friend]p5 4846 // A function can be defined in a friend declaration of a 4847 // class . . . . Such a function is implicitly inline. 4848 NewFD->setImplicitlyInline(); 4849 } 4850 4851 SetNestedNameSpecifier(NewFD, D); 4852 isExplicitSpecialization = false; 4853 isFunctionTemplateSpecialization = false; 4854 if (D.isInvalidType()) 4855 NewFD->setInvalidDecl(); 4856 4857 // Set the lexical context. If the declarator has a C++ 4858 // scope specifier, or is the object of a friend declaration, the 4859 // lexical context will be different from the semantic context. 4860 NewFD->setLexicalDeclContext(CurContext); 4861 4862 // Match up the template parameter lists with the scope specifier, then 4863 // determine whether we have a template or a template specialization. 4864 bool Invalid = false; 4865 if (TemplateParameterList *TemplateParams 4866 = MatchTemplateParametersToScopeSpecifier( 4867 D.getDeclSpec().getSourceRange().getBegin(), 4868 D.getIdentifierLoc(), 4869 D.getCXXScopeSpec(), 4870 TemplateParamLists.get(), 4871 TemplateParamLists.size(), 4872 isFriend, 4873 isExplicitSpecialization, 4874 Invalid)) { 4875 if (TemplateParams->size() > 0) { 4876 // This is a function template 4877 4878 // Check that we can declare a template here. 4879 if (CheckTemplateDeclScope(S, TemplateParams)) 4880 return 0; 4881 4882 // A destructor cannot be a template. 4883 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4884 Diag(NewFD->getLocation(), diag::err_destructor_template); 4885 return 0; 4886 } 4887 4888 // If we're adding a template to a dependent context, we may need to 4889 // rebuilding some of the types used within the template parameter list, 4890 // now that we know what the current instantiation is. 4891 if (DC->isDependentContext()) { 4892 ContextRAII SavedContext(*this, DC); 4893 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4894 Invalid = true; 4895 } 4896 4897 4898 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4899 NewFD->getLocation(), 4900 Name, TemplateParams, 4901 NewFD); 4902 FunctionTemplate->setLexicalDeclContext(CurContext); 4903 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4904 4905 // For source fidelity, store the other template param lists. 4906 if (TemplateParamLists.size() > 1) { 4907 NewFD->setTemplateParameterListsInfo(Context, 4908 TemplateParamLists.size() - 1, 4909 TemplateParamLists.release()); 4910 } 4911 } else { 4912 // This is a function template specialization. 4913 isFunctionTemplateSpecialization = true; 4914 // For source fidelity, store all the template param lists. 4915 NewFD->setTemplateParameterListsInfo(Context, 4916 TemplateParamLists.size(), 4917 TemplateParamLists.release()); 4918 4919 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4920 if (isFriend) { 4921 // We want to remove the "template<>", found here. 4922 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4923 4924 // If we remove the template<> and the name is not a 4925 // template-id, we're actually silently creating a problem: 4926 // the friend declaration will refer to an untemplated decl, 4927 // and clearly the user wants a template specialization. So 4928 // we need to insert '<>' after the name. 4929 SourceLocation InsertLoc; 4930 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4931 InsertLoc = D.getName().getSourceRange().getEnd(); 4932 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4933 } 4934 4935 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4936 << Name << RemoveRange 4937 << FixItHint::CreateRemoval(RemoveRange) 4938 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4939 } 4940 } 4941 } 4942 else { 4943 // All template param lists were matched against the scope specifier: 4944 // this is NOT (an explicit specialization of) a template. 4945 if (TemplateParamLists.size() > 0) 4946 // For source fidelity, store all the template param lists. 4947 NewFD->setTemplateParameterListsInfo(Context, 4948 TemplateParamLists.size(), 4949 TemplateParamLists.release()); 4950 } 4951 4952 if (Invalid) { 4953 NewFD->setInvalidDecl(); 4954 if (FunctionTemplate) 4955 FunctionTemplate->setInvalidDecl(); 4956 } 4957 4958 // If we see "T var();" at block scope, where T is a class type, it is 4959 // probably an attempt to initialize a variable, not a function declaration. 4960 // We don't catch this case earlier, since there is no ambiguity here. 4961 if (!FunctionTemplate && D.getFunctionDefinitionKind() == FDK_Declaration && 4962 CurContext->isFunctionOrMethod() && 4963 D.getNumTypeObjects() == 1 && D.isFunctionDeclarator() && 4964 D.getDeclSpec().getStorageClassSpecAsWritten() 4965 == DeclSpec::SCS_unspecified) { 4966 QualType T = R->getAs<FunctionType>()->getResultType(); 4967 DeclaratorChunk &C = D.getTypeObject(0); 4968 if (!T->isVoidType() && C.Fun.NumArgs == 0 && !C.Fun.isVariadic && 4969 !C.Fun.TrailingReturnType && 4970 C.Fun.getExceptionSpecType() == EST_None) { 4971 SourceRange ParenRange(C.Loc, C.EndLoc); 4972 Diag(C.Loc, diag::warn_empty_parens_are_function_decl) << ParenRange; 4973 4974 // If the declaration looks like: 4975 // T var1, 4976 // f(); 4977 // and name lookup finds a function named 'f', then the ',' was 4978 // probably intended to be a ';'. 4979 if (!D.isFirstDeclarator() && D.getIdentifier()) { 4980 FullSourceLoc Comma(D.getCommaLoc(), SourceMgr); 4981 FullSourceLoc Name(D.getIdentifierLoc(), SourceMgr); 4982 if (Comma.getFileID() != Name.getFileID() || 4983 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 4984 LookupResult Result(*this, D.getIdentifier(), SourceLocation(), 4985 LookupOrdinaryName); 4986 if (LookupName(Result, S)) 4987 Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 4988 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") << NewFD; 4989 } 4990 } 4991 const CXXRecordDecl *RD = T->getAsCXXRecordDecl(); 4992 // Empty parens mean value-initialization, and no parens mean default 4993 // initialization. These are equivalent if the default constructor is 4994 // user-provided, or if zero-initialization is a no-op. 4995 if (RD && RD->hasDefinition() && 4996 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 4997 Diag(C.Loc, diag::note_empty_parens_default_ctor) 4998 << FixItHint::CreateRemoval(ParenRange); 4999 else if (const char *Init = getFixItZeroInitializerForType(T)) 5000 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5001 << FixItHint::CreateReplacement(ParenRange, Init); 5002 else if (LangOpts.CPlusPlus0x) 5003 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5004 << FixItHint::CreateReplacement(ParenRange, "{}"); 5005 } 5006 } 5007 5008 // C++ [dcl.fct.spec]p5: 5009 // The virtual specifier shall only be used in declarations of 5010 // nonstatic class member functions that appear within a 5011 // member-specification of a class declaration; see 10.3. 5012 // 5013 if (isVirtual && !NewFD->isInvalidDecl()) { 5014 if (!isVirtualOkay) { 5015 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5016 diag::err_virtual_non_function); 5017 } else if (!CurContext->isRecord()) { 5018 // 'virtual' was specified outside of the class. 5019 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5020 diag::err_virtual_out_of_class) 5021 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5022 } else if (NewFD->getDescribedFunctionTemplate()) { 5023 // C++ [temp.mem]p3: 5024 // A member function template shall not be virtual. 5025 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5026 diag::err_virtual_member_function_template) 5027 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5028 } else { 5029 // Okay: Add virtual to the method. 5030 NewFD->setVirtualAsWritten(true); 5031 } 5032 } 5033 5034 // C++ [dcl.fct.spec]p3: 5035 // The inline specifier shall not appear on a block scope function 5036 // declaration. 5037 if (isInline && !NewFD->isInvalidDecl()) { 5038 if (CurContext->isFunctionOrMethod()) { 5039 // 'inline' is not allowed on block scope function declaration. 5040 Diag(D.getDeclSpec().getInlineSpecLoc(), 5041 diag::err_inline_declaration_block_scope) << Name 5042 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 5043 } 5044 } 5045 5046 // C++ [dcl.fct.spec]p6: 5047 // The explicit specifier shall be used only in the declaration of a 5048 // constructor or conversion function within its class definition; 5049 // see 12.3.1 and 12.3.2. 5050 if (isExplicit && !NewFD->isInvalidDecl()) { 5051 if (!CurContext->isRecord()) { 5052 // 'explicit' was specified outside of the class. 5053 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5054 diag::err_explicit_out_of_class) 5055 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5056 } else if (!isa<CXXConstructorDecl>(NewFD) && 5057 !isa<CXXConversionDecl>(NewFD)) { 5058 // 'explicit' was specified on a function that wasn't a constructor 5059 // or conversion function. 5060 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5061 diag::err_explicit_non_ctor_or_conv_function) 5062 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5063 } 5064 } 5065 5066 if (isConstexpr) { 5067 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 5068 // are implicitly inline. 5069 NewFD->setImplicitlyInline(); 5070 5071 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 5072 // be either constructors or to return a literal type. Therefore, 5073 // destructors cannot be declared constexpr. 5074 if (isa<CXXDestructorDecl>(NewFD)) 5075 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 5076 } 5077 5078 // If __module_private__ was specified, mark the function accordingly. 5079 if (D.getDeclSpec().isModulePrivateSpecified()) { 5080 if (isFunctionTemplateSpecialization) { 5081 SourceLocation ModulePrivateLoc 5082 = D.getDeclSpec().getModulePrivateSpecLoc(); 5083 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5084 << 0 5085 << FixItHint::CreateRemoval(ModulePrivateLoc); 5086 } else { 5087 NewFD->setModulePrivate(); 5088 if (FunctionTemplate) 5089 FunctionTemplate->setModulePrivate(); 5090 } 5091 } 5092 5093 if (isFriend) { 5094 // For now, claim that the objects have no previous declaration. 5095 if (FunctionTemplate) { 5096 FunctionTemplate->setObjectOfFriendDecl(false); 5097 FunctionTemplate->setAccess(AS_public); 5098 } 5099 NewFD->setObjectOfFriendDecl(false); 5100 NewFD->setAccess(AS_public); 5101 } 5102 5103 // If a function is defined as defaulted or deleted, mark it as such now. 5104 switch (D.getFunctionDefinitionKind()) { 5105 case FDK_Declaration: 5106 case FDK_Definition: 5107 break; 5108 5109 case FDK_Defaulted: 5110 NewFD->setDefaulted(); 5111 break; 5112 5113 case FDK_Deleted: 5114 NewFD->setDeletedAsWritten(); 5115 break; 5116 } 5117 5118 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5119 D.isFunctionDefinition()) { 5120 // C++ [class.mfct]p2: 5121 // A member function may be defined (8.4) in its class definition, in 5122 // which case it is an inline member function (7.1.2) 5123 NewFD->setImplicitlyInline(); 5124 } 5125 5126 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5127 !CurContext->isRecord()) { 5128 // C++ [class.static]p1: 5129 // A data or function member of a class may be declared static 5130 // in a class definition, in which case it is a static member of 5131 // the class. 5132 5133 // Complain about the 'static' specifier if it's on an out-of-line 5134 // member function definition. 5135 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5136 diag::err_static_out_of_line) 5137 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5138 } 5139 } 5140 5141 // Filter out previous declarations that don't match the scope. 5142 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5143 isExplicitSpecialization || 5144 isFunctionTemplateSpecialization); 5145 5146 // Handle GNU asm-label extension (encoded as an attribute). 5147 if (Expr *E = (Expr*) D.getAsmLabel()) { 5148 // The parser guarantees this is a string. 5149 StringLiteral *SE = cast<StringLiteral>(E); 5150 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5151 SE->getString())); 5152 } 5153 5154 // Copy the parameter declarations from the declarator D to the function 5155 // declaration NewFD, if they are available. First scavenge them into Params. 5156 SmallVector<ParmVarDecl*, 16> Params; 5157 if (D.isFunctionDeclarator()) { 5158 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5159 5160 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5161 // function that takes no arguments, not a function that takes a 5162 // single void argument. 5163 // We let through "const void" here because Sema::GetTypeForDeclarator 5164 // already checks for that case. 5165 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5166 FTI.ArgInfo[0].Param && 5167 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5168 // Empty arg list, don't push any params. 5169 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5170 5171 // In C++, the empty parameter-type-list must be spelled "void"; a 5172 // typedef of void is not permitted. 5173 if (getLangOptions().CPlusPlus && 5174 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5175 bool IsTypeAlias = false; 5176 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5177 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5178 else if (const TemplateSpecializationType *TST = 5179 Param->getType()->getAs<TemplateSpecializationType>()) 5180 IsTypeAlias = TST->isTypeAlias(); 5181 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5182 << IsTypeAlias; 5183 } 5184 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5185 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5186 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5187 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5188 Param->setDeclContext(NewFD); 5189 Params.push_back(Param); 5190 5191 if (Param->isInvalidDecl()) 5192 NewFD->setInvalidDecl(); 5193 } 5194 } 5195 5196 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5197 // When we're declaring a function with a typedef, typeof, etc as in the 5198 // following example, we'll need to synthesize (unnamed) 5199 // parameters for use in the declaration. 5200 // 5201 // @code 5202 // typedef void fn(int); 5203 // fn f; 5204 // @endcode 5205 5206 // Synthesize a parameter for each argument type. 5207 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5208 AE = FT->arg_type_end(); AI != AE; ++AI) { 5209 ParmVarDecl *Param = 5210 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5211 Param->setScopeInfo(0, Params.size()); 5212 Params.push_back(Param); 5213 } 5214 } else { 5215 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5216 "Should not need args for typedef of non-prototype fn"); 5217 } 5218 5219 // Finally, we know we have the right number of parameters, install them. 5220 NewFD->setParams(Params); 5221 5222 // Process the non-inheritable attributes on this declaration. 5223 ProcessDeclAttributes(S, NewFD, D, 5224 /*NonInheritable=*/true, /*Inheritable=*/false); 5225 5226 if (!getLangOptions().CPlusPlus) { 5227 // Perform semantic checking on the function declaration. 5228 bool isExplicitSpecialization=false; 5229 if (!NewFD->isInvalidDecl()) { 5230 if (NewFD->getResultType()->isVariablyModifiedType()) { 5231 // Functions returning a variably modified type violate C99 6.7.5.2p2 5232 // because all functions have linkage. 5233 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5234 NewFD->setInvalidDecl(); 5235 } else { 5236 if (NewFD->isMain()) 5237 CheckMain(NewFD, D.getDeclSpec()); 5238 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5239 isExplicitSpecialization)); 5240 } 5241 } 5242 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5243 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5244 "previous declaration set still overloaded"); 5245 } else { 5246 // If the declarator is a template-id, translate the parser's template 5247 // argument list into our AST format. 5248 bool HasExplicitTemplateArgs = false; 5249 TemplateArgumentListInfo TemplateArgs; 5250 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5251 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5252 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5253 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5254 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5255 TemplateId->getTemplateArgs(), 5256 TemplateId->NumArgs); 5257 translateTemplateArguments(TemplateArgsPtr, 5258 TemplateArgs); 5259 TemplateArgsPtr.release(); 5260 5261 HasExplicitTemplateArgs = true; 5262 5263 if (NewFD->isInvalidDecl()) { 5264 HasExplicitTemplateArgs = false; 5265 } else if (FunctionTemplate) { 5266 // Function template with explicit template arguments. 5267 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5268 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5269 5270 HasExplicitTemplateArgs = false; 5271 } else if (!isFunctionTemplateSpecialization && 5272 !D.getDeclSpec().isFriendSpecified()) { 5273 // We have encountered something that the user meant to be a 5274 // specialization (because it has explicitly-specified template 5275 // arguments) but that was not introduced with a "template<>" (or had 5276 // too few of them). 5277 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5278 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5279 << FixItHint::CreateInsertion( 5280 D.getDeclSpec().getSourceRange().getBegin(), 5281 "template<> "); 5282 isFunctionTemplateSpecialization = true; 5283 } else { 5284 // "friend void foo<>(int);" is an implicit specialization decl. 5285 isFunctionTemplateSpecialization = true; 5286 } 5287 } else if (isFriend && isFunctionTemplateSpecialization) { 5288 // This combination is only possible in a recovery case; the user 5289 // wrote something like: 5290 // template <> friend void foo(int); 5291 // which we're recovering from as if the user had written: 5292 // friend void foo<>(int); 5293 // Go ahead and fake up a template id. 5294 HasExplicitTemplateArgs = true; 5295 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5296 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5297 } 5298 5299 // If it's a friend (and only if it's a friend), it's possible 5300 // that either the specialized function type or the specialized 5301 // template is dependent, and therefore matching will fail. In 5302 // this case, don't check the specialization yet. 5303 bool InstantiationDependent = false; 5304 if (isFunctionTemplateSpecialization && isFriend && 5305 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5306 TemplateSpecializationType::anyDependentTemplateArguments( 5307 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5308 InstantiationDependent))) { 5309 assert(HasExplicitTemplateArgs && 5310 "friend function specialization without template args"); 5311 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5312 Previous)) 5313 NewFD->setInvalidDecl(); 5314 } else if (isFunctionTemplateSpecialization) { 5315 if (CurContext->isDependentContext() && CurContext->isRecord() 5316 && !isFriend) { 5317 isDependentClassScopeExplicitSpecialization = true; 5318 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5319 diag::ext_function_specialization_in_class : 5320 diag::err_function_specialization_in_class) 5321 << NewFD->getDeclName(); 5322 } else if (CheckFunctionTemplateSpecialization(NewFD, 5323 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5324 Previous)) 5325 NewFD->setInvalidDecl(); 5326 5327 // C++ [dcl.stc]p1: 5328 // A storage-class-specifier shall not be specified in an explicit 5329 // specialization (14.7.3) 5330 if (SC != SC_None) { 5331 if (SC != NewFD->getStorageClass()) 5332 Diag(NewFD->getLocation(), 5333 diag::err_explicit_specialization_inconsistent_storage_class) 5334 << SC 5335 << FixItHint::CreateRemoval( 5336 D.getDeclSpec().getStorageClassSpecLoc()); 5337 5338 else 5339 Diag(NewFD->getLocation(), 5340 diag::ext_explicit_specialization_storage_class) 5341 << FixItHint::CreateRemoval( 5342 D.getDeclSpec().getStorageClassSpecLoc()); 5343 } 5344 5345 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5346 if (CheckMemberSpecialization(NewFD, Previous)) 5347 NewFD->setInvalidDecl(); 5348 } 5349 5350 // Perform semantic checking on the function declaration. 5351 if (!isDependentClassScopeExplicitSpecialization) { 5352 if (NewFD->isInvalidDecl()) { 5353 // If this is a class member, mark the class invalid immediately. 5354 // This avoids some consistency errors later. 5355 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5356 methodDecl->getParent()->setInvalidDecl(); 5357 } else { 5358 if (NewFD->isMain()) 5359 CheckMain(NewFD, D.getDeclSpec()); 5360 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5361 isExplicitSpecialization)); 5362 } 5363 } 5364 5365 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5366 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5367 "previous declaration set still overloaded"); 5368 5369 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5370 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5371 NewFD->setInvalidDecl(); 5372 5373 NamedDecl *PrincipalDecl = (FunctionTemplate 5374 ? cast<NamedDecl>(FunctionTemplate) 5375 : NewFD); 5376 5377 if (isFriend && D.isRedeclaration()) { 5378 AccessSpecifier Access = AS_public; 5379 if (!NewFD->isInvalidDecl()) 5380 Access = NewFD->getPreviousDecl()->getAccess(); 5381 5382 NewFD->setAccess(Access); 5383 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5384 5385 PrincipalDecl->setObjectOfFriendDecl(true); 5386 } 5387 5388 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5389 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5390 PrincipalDecl->setNonMemberOperator(); 5391 5392 // If we have a function template, check the template parameter 5393 // list. This will check and merge default template arguments. 5394 if (FunctionTemplate) { 5395 FunctionTemplateDecl *PrevTemplate = 5396 FunctionTemplate->getPreviousDecl(); 5397 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5398 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5399 D.getDeclSpec().isFriendSpecified() 5400 ? (D.isFunctionDefinition() 5401 ? TPC_FriendFunctionTemplateDefinition 5402 : TPC_FriendFunctionTemplate) 5403 : (D.getCXXScopeSpec().isSet() && 5404 DC && DC->isRecord() && 5405 DC->isDependentContext()) 5406 ? TPC_ClassTemplateMember 5407 : TPC_FunctionTemplate); 5408 } 5409 5410 if (NewFD->isInvalidDecl()) { 5411 // Ignore all the rest of this. 5412 } else if (!D.isRedeclaration()) { 5413 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5414 AddToScope }; 5415 // Fake up an access specifier if it's supposed to be a class member. 5416 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5417 NewFD->setAccess(AS_public); 5418 5419 // Qualified decls generally require a previous declaration. 5420 if (D.getCXXScopeSpec().isSet()) { 5421 // ...with the major exception of templated-scope or 5422 // dependent-scope friend declarations. 5423 5424 // TODO: we currently also suppress this check in dependent 5425 // contexts because (1) the parameter depth will be off when 5426 // matching friend templates and (2) we might actually be 5427 // selecting a friend based on a dependent factor. But there 5428 // are situations where these conditions don't apply and we 5429 // can actually do this check immediately. 5430 if (isFriend && 5431 (TemplateParamLists.size() || 5432 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5433 CurContext->isDependentContext())) { 5434 // ignore these 5435 } else { 5436 // The user tried to provide an out-of-line definition for a 5437 // function that is a member of a class or namespace, but there 5438 // was no such member function declared (C++ [class.mfct]p2, 5439 // C++ [namespace.memdef]p2). For example: 5440 // 5441 // class X { 5442 // void f() const; 5443 // }; 5444 // 5445 // void X::f() { } // ill-formed 5446 // 5447 // Complain about this problem, and attempt to suggest close 5448 // matches (e.g., those that differ only in cv-qualifiers and 5449 // whether the parameter types are references). 5450 5451 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5452 NewFD, 5453 ExtraArgs)) { 5454 AddToScope = ExtraArgs.AddToScope; 5455 return Result; 5456 } 5457 } 5458 5459 // Unqualified local friend declarations are required to resolve 5460 // to something. 5461 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5462 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5463 NewFD, 5464 ExtraArgs)) { 5465 AddToScope = ExtraArgs.AddToScope; 5466 return Result; 5467 } 5468 } 5469 5470 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5471 !isFriend && !isFunctionTemplateSpecialization && 5472 !isExplicitSpecialization) { 5473 // An out-of-line member function declaration must also be a 5474 // definition (C++ [dcl.meaning]p1). 5475 // Note that this is not the case for explicit specializations of 5476 // function templates or member functions of class templates, per 5477 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5478 // extension for compatibility with old SWIG code which likes to 5479 // generate them. 5480 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5481 << D.getCXXScopeSpec().getRange(); 5482 } 5483 } 5484 5485 5486 // Handle attributes. We need to have merged decls when handling attributes 5487 // (for example to check for conflicts, etc). 5488 // FIXME: This needs to happen before we merge declarations. Then, 5489 // let attribute merging cope with attribute conflicts. 5490 ProcessDeclAttributes(S, NewFD, D, 5491 /*NonInheritable=*/false, /*Inheritable=*/true); 5492 5493 // attributes declared post-definition are currently ignored 5494 // FIXME: This should happen during attribute merging 5495 if (D.isRedeclaration() && Previous.isSingleResult()) { 5496 const FunctionDecl *Def; 5497 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5498 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5499 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5500 Diag(Def->getLocation(), diag::note_previous_definition); 5501 } 5502 } 5503 5504 AddKnownFunctionAttributes(NewFD); 5505 5506 if (NewFD->hasAttr<OverloadableAttr>() && 5507 !NewFD->getType()->getAs<FunctionProtoType>()) { 5508 Diag(NewFD->getLocation(), 5509 diag::err_attribute_overloadable_no_prototype) 5510 << NewFD; 5511 5512 // Turn this into a variadic function with no parameters. 5513 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5514 FunctionProtoType::ExtProtoInfo EPI; 5515 EPI.Variadic = true; 5516 EPI.ExtInfo = FT->getExtInfo(); 5517 5518 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5519 NewFD->setType(R); 5520 } 5521 5522 // If there's a #pragma GCC visibility in scope, and this isn't a class 5523 // member, set the visibility of this function. 5524 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5525 AddPushedVisibilityAttribute(NewFD); 5526 5527 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5528 // marking the function. 5529 AddCFAuditedAttribute(NewFD); 5530 5531 // If this is a locally-scoped extern C function, update the 5532 // map of such names. 5533 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5534 && !NewFD->isInvalidDecl()) 5535 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5536 5537 // Set this FunctionDecl's range up to the right paren. 5538 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5539 5540 if (getLangOptions().CPlusPlus) { 5541 if (FunctionTemplate) { 5542 if (NewFD->isInvalidDecl()) 5543 FunctionTemplate->setInvalidDecl(); 5544 return FunctionTemplate; 5545 } 5546 } 5547 5548 MarkUnusedFileScopedDecl(NewFD); 5549 5550 if (getLangOptions().CUDA) 5551 if (IdentifierInfo *II = NewFD->getIdentifier()) 5552 if (!NewFD->isInvalidDecl() && 5553 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5554 if (II->isStr("cudaConfigureCall")) { 5555 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5556 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5557 5558 Context.setcudaConfigureCallDecl(NewFD); 5559 } 5560 } 5561 5562 // Here we have an function template explicit specialization at class scope. 5563 // The actually specialization will be postponed to template instatiation 5564 // time via the ClassScopeFunctionSpecializationDecl node. 5565 if (isDependentClassScopeExplicitSpecialization) { 5566 ClassScopeFunctionSpecializationDecl *NewSpec = 5567 ClassScopeFunctionSpecializationDecl::Create( 5568 Context, CurContext, SourceLocation(), 5569 cast<CXXMethodDecl>(NewFD)); 5570 CurContext->addDecl(NewSpec); 5571 AddToScope = false; 5572 } 5573 5574 return NewFD; 5575} 5576 5577/// \brief Perform semantic checking of a new function declaration. 5578/// 5579/// Performs semantic analysis of the new function declaration 5580/// NewFD. This routine performs all semantic checking that does not 5581/// require the actual declarator involved in the declaration, and is 5582/// used both for the declaration of functions as they are parsed 5583/// (called via ActOnDeclarator) and for the declaration of functions 5584/// that have been instantiated via C++ template instantiation (called 5585/// via InstantiateDecl). 5586/// 5587/// \param IsExplicitSpecialiation whether this new function declaration is 5588/// an explicit specialization of the previous declaration. 5589/// 5590/// This sets NewFD->isInvalidDecl() to true if there was an error. 5591/// 5592/// Returns true if the function declaration is a redeclaration. 5593bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5594 LookupResult &Previous, 5595 bool IsExplicitSpecialization) { 5596 assert(!NewFD->getResultType()->isVariablyModifiedType() 5597 && "Variably modified return types are not handled here"); 5598 5599 // Check for a previous declaration of this name. 5600 if (Previous.empty() && NewFD->isExternC()) { 5601 // Since we did not find anything by this name and we're declaring 5602 // an extern "C" function, look for a non-visible extern "C" 5603 // declaration with the same name. 5604 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5605 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5606 if (Pos != LocallyScopedExternalDecls.end()) 5607 Previous.addDecl(Pos->second); 5608 } 5609 5610 bool Redeclaration = false; 5611 5612 // Merge or overload the declaration with an existing declaration of 5613 // the same name, if appropriate. 5614 if (!Previous.empty()) { 5615 // Determine whether NewFD is an overload of PrevDecl or 5616 // a declaration that requires merging. If it's an overload, 5617 // there's no more work to do here; we'll just add the new 5618 // function to the scope. 5619 5620 NamedDecl *OldDecl = 0; 5621 if (!AllowOverloadingOfFunction(Previous, Context)) { 5622 Redeclaration = true; 5623 OldDecl = Previous.getFoundDecl(); 5624 } else { 5625 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5626 /*NewIsUsingDecl*/ false)) { 5627 case Ovl_Match: 5628 Redeclaration = true; 5629 break; 5630 5631 case Ovl_NonFunction: 5632 Redeclaration = true; 5633 break; 5634 5635 case Ovl_Overload: 5636 Redeclaration = false; 5637 break; 5638 } 5639 5640 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5641 // If a function name is overloadable in C, then every function 5642 // with that name must be marked "overloadable". 5643 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5644 << Redeclaration << NewFD; 5645 NamedDecl *OverloadedDecl = 0; 5646 if (Redeclaration) 5647 OverloadedDecl = OldDecl; 5648 else if (!Previous.empty()) 5649 OverloadedDecl = Previous.getRepresentativeDecl(); 5650 if (OverloadedDecl) 5651 Diag(OverloadedDecl->getLocation(), 5652 diag::note_attribute_overloadable_prev_overload); 5653 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5654 Context)); 5655 } 5656 } 5657 5658 if (Redeclaration) { 5659 // NewFD and OldDecl represent declarations that need to be 5660 // merged. 5661 if (MergeFunctionDecl(NewFD, OldDecl)) { 5662 NewFD->setInvalidDecl(); 5663 return Redeclaration; 5664 } 5665 5666 Previous.clear(); 5667 Previous.addDecl(OldDecl); 5668 5669 if (FunctionTemplateDecl *OldTemplateDecl 5670 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5671 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5672 FunctionTemplateDecl *NewTemplateDecl 5673 = NewFD->getDescribedFunctionTemplate(); 5674 assert(NewTemplateDecl && "Template/non-template mismatch"); 5675 if (CXXMethodDecl *Method 5676 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5677 Method->setAccess(OldTemplateDecl->getAccess()); 5678 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5679 } 5680 5681 // If this is an explicit specialization of a member that is a function 5682 // template, mark it as a member specialization. 5683 if (IsExplicitSpecialization && 5684 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5685 NewTemplateDecl->setMemberSpecialization(); 5686 assert(OldTemplateDecl->isMemberSpecialization()); 5687 } 5688 5689 } else { 5690 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5691 NewFD->setAccess(OldDecl->getAccess()); 5692 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5693 } 5694 } 5695 } 5696 5697 // Semantic checking for this function declaration (in isolation). 5698 if (getLangOptions().CPlusPlus) { 5699 // C++-specific checks. 5700 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5701 CheckConstructor(Constructor); 5702 } else if (CXXDestructorDecl *Destructor = 5703 dyn_cast<CXXDestructorDecl>(NewFD)) { 5704 CXXRecordDecl *Record = Destructor->getParent(); 5705 QualType ClassType = Context.getTypeDeclType(Record); 5706 5707 // FIXME: Shouldn't we be able to perform this check even when the class 5708 // type is dependent? Both gcc and edg can handle that. 5709 if (!ClassType->isDependentType()) { 5710 DeclarationName Name 5711 = Context.DeclarationNames.getCXXDestructorName( 5712 Context.getCanonicalType(ClassType)); 5713 if (NewFD->getDeclName() != Name) { 5714 Diag(NewFD->getLocation(), diag::err_destructor_name); 5715 NewFD->setInvalidDecl(); 5716 return Redeclaration; 5717 } 5718 } 5719 } else if (CXXConversionDecl *Conversion 5720 = dyn_cast<CXXConversionDecl>(NewFD)) { 5721 ActOnConversionDeclarator(Conversion); 5722 } 5723 5724 // Find any virtual functions that this function overrides. 5725 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5726 if (!Method->isFunctionTemplateSpecialization() && 5727 !Method->getDescribedFunctionTemplate()) { 5728 if (AddOverriddenMethods(Method->getParent(), Method)) { 5729 // If the function was marked as "static", we have a problem. 5730 if (NewFD->getStorageClass() == SC_Static) { 5731 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5732 << NewFD->getDeclName(); 5733 for (CXXMethodDecl::method_iterator 5734 Overridden = Method->begin_overridden_methods(), 5735 OverriddenEnd = Method->end_overridden_methods(); 5736 Overridden != OverriddenEnd; 5737 ++Overridden) { 5738 Diag((*Overridden)->getLocation(), 5739 diag::note_overridden_virtual_function); 5740 } 5741 } 5742 } 5743 } 5744 } 5745 5746 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5747 if (NewFD->isOverloadedOperator() && 5748 CheckOverloadedOperatorDeclaration(NewFD)) { 5749 NewFD->setInvalidDecl(); 5750 return Redeclaration; 5751 } 5752 5753 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5754 if (NewFD->getLiteralIdentifier() && 5755 CheckLiteralOperatorDeclaration(NewFD)) { 5756 NewFD->setInvalidDecl(); 5757 return Redeclaration; 5758 } 5759 5760 // In C++, check default arguments now that we have merged decls. Unless 5761 // the lexical context is the class, because in this case this is done 5762 // during delayed parsing anyway. 5763 if (!CurContext->isRecord()) 5764 CheckCXXDefaultArguments(NewFD); 5765 5766 // If this function declares a builtin function, check the type of this 5767 // declaration against the expected type for the builtin. 5768 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5769 ASTContext::GetBuiltinTypeError Error; 5770 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5771 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5772 // The type of this function differs from the type of the builtin, 5773 // so forget about the builtin entirely. 5774 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5775 } 5776 } 5777 } 5778 return Redeclaration; 5779} 5780 5781void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5782 // C++11 [basic.start.main]p3: A program that declares main to be inline, 5783 // static or constexpr is ill-formed. 5784 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5785 // shall not appear in a declaration of main. 5786 // static main is not an error under C99, but we should warn about it. 5787 if (FD->getStorageClass() == SC_Static) 5788 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5789 ? diag::err_static_main : diag::warn_static_main) 5790 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5791 if (FD->isInlineSpecified()) 5792 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5793 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5794 if (FD->isConstexpr()) { 5795 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main) 5796 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc()); 5797 FD->setConstexpr(false); 5798 } 5799 5800 QualType T = FD->getType(); 5801 assert(T->isFunctionType() && "function decl is not of function type"); 5802 const FunctionType* FT = T->getAs<FunctionType>(); 5803 5804 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5805 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5806 FD->setInvalidDecl(true); 5807 } 5808 5809 // Treat protoless main() as nullary. 5810 if (isa<FunctionNoProtoType>(FT)) return; 5811 5812 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5813 unsigned nparams = FTP->getNumArgs(); 5814 assert(FD->getNumParams() == nparams); 5815 5816 bool HasExtraParameters = (nparams > 3); 5817 5818 // Darwin passes an undocumented fourth argument of type char**. If 5819 // other platforms start sprouting these, the logic below will start 5820 // getting shifty. 5821 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5822 HasExtraParameters = false; 5823 5824 if (HasExtraParameters) { 5825 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5826 FD->setInvalidDecl(true); 5827 nparams = 3; 5828 } 5829 5830 // FIXME: a lot of the following diagnostics would be improved 5831 // if we had some location information about types. 5832 5833 QualType CharPP = 5834 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5835 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5836 5837 for (unsigned i = 0; i < nparams; ++i) { 5838 QualType AT = FTP->getArgType(i); 5839 5840 bool mismatch = true; 5841 5842 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5843 mismatch = false; 5844 else if (Expected[i] == CharPP) { 5845 // As an extension, the following forms are okay: 5846 // char const ** 5847 // char const * const * 5848 // char * const * 5849 5850 QualifierCollector qs; 5851 const PointerType* PT; 5852 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5853 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5854 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5855 qs.removeConst(); 5856 mismatch = !qs.empty(); 5857 } 5858 } 5859 5860 if (mismatch) { 5861 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5862 // TODO: suggest replacing given type with expected type 5863 FD->setInvalidDecl(true); 5864 } 5865 } 5866 5867 if (nparams == 1 && !FD->isInvalidDecl()) { 5868 Diag(FD->getLocation(), diag::warn_main_one_arg); 5869 } 5870 5871 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5872 Diag(FD->getLocation(), diag::err_main_template_decl); 5873 FD->setInvalidDecl(); 5874 } 5875} 5876 5877bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5878 // FIXME: Need strict checking. In C89, we need to check for 5879 // any assignment, increment, decrement, function-calls, or 5880 // commas outside of a sizeof. In C99, it's the same list, 5881 // except that the aforementioned are allowed in unevaluated 5882 // expressions. Everything else falls under the 5883 // "may accept other forms of constant expressions" exception. 5884 // (We never end up here for C++, so the constant expression 5885 // rules there don't matter.) 5886 if (Init->isConstantInitializer(Context, false)) 5887 return false; 5888 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5889 << Init->getSourceRange(); 5890 return true; 5891} 5892 5893namespace { 5894 // Visits an initialization expression to see if OrigDecl is evaluated in 5895 // its own initialization and throws a warning if it does. 5896 class SelfReferenceChecker 5897 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5898 Sema &S; 5899 Decl *OrigDecl; 5900 bool isRecordType; 5901 bool isPODType; 5902 5903 public: 5904 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5905 5906 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5907 S(S), OrigDecl(OrigDecl) { 5908 isPODType = false; 5909 isRecordType = false; 5910 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5911 isPODType = VD->getType().isPODType(S.Context); 5912 isRecordType = VD->getType()->isRecordType(); 5913 } 5914 } 5915 5916 void VisitExpr(Expr *E) { 5917 if (isa<ObjCMessageExpr>(*E)) return; 5918 if (isRecordType) { 5919 Expr *expr = E; 5920 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5921 ValueDecl *VD = ME->getMemberDecl(); 5922 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5923 expr = ME->getBase(); 5924 } 5925 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5926 HandleDeclRefExpr(DRE); 5927 return; 5928 } 5929 } 5930 Inherited::VisitExpr(E); 5931 } 5932 5933 void VisitMemberExpr(MemberExpr *E) { 5934 if (E->getType()->canDecayToPointerType()) return; 5935 if (isa<FieldDecl>(E->getMemberDecl())) 5936 if (DeclRefExpr *DRE 5937 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5938 HandleDeclRefExpr(DRE); 5939 return; 5940 } 5941 Inherited::VisitMemberExpr(E); 5942 } 5943 5944 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5945 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5946 (isRecordType && E->getCastKind() == CK_NoOp)) { 5947 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5948 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5949 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5950 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5951 HandleDeclRefExpr(DRE); 5952 return; 5953 } 5954 } 5955 Inherited::VisitImplicitCastExpr(E); 5956 } 5957 5958 void VisitUnaryOperator(UnaryOperator *E) { 5959 // For POD record types, addresses of its own members are well-defined. 5960 if (isRecordType && isPODType) return; 5961 Inherited::VisitUnaryOperator(E); 5962 } 5963 5964 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5965 Decl* ReferenceDecl = DRE->getDecl(); 5966 if (OrigDecl != ReferenceDecl) return; 5967 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5968 Sema::NotForRedeclaration); 5969 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5970 S.PDiag(diag::warn_uninit_self_reference_in_init) 5971 << Result.getLookupName() 5972 << OrigDecl->getLocation() 5973 << DRE->getSourceRange()); 5974 } 5975 }; 5976} 5977 5978/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5979void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5980 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5981} 5982 5983/// AddInitializerToDecl - Adds the initializer Init to the 5984/// declaration dcl. If DirectInit is true, this is C++ direct 5985/// initialization rather than copy initialization. 5986void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5987 bool DirectInit, bool TypeMayContainAuto) { 5988 // If there is no declaration, there was an error parsing it. Just ignore 5989 // the initializer. 5990 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5991 return; 5992 5993 // Check for self-references within variable initializers. 5994 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5995 // Variables declared within a function/method body are handled 5996 // by a dataflow analysis. 5997 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5998 CheckSelfReference(RealDecl, Init); 5999 } 6000 else { 6001 CheckSelfReference(RealDecl, Init); 6002 } 6003 6004 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 6005 // With declarators parsed the way they are, the parser cannot 6006 // distinguish between a normal initializer and a pure-specifier. 6007 // Thus this grotesque test. 6008 IntegerLiteral *IL; 6009 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 6010 Context.getCanonicalType(IL->getType()) == Context.IntTy) 6011 CheckPureMethod(Method, Init->getSourceRange()); 6012 else { 6013 Diag(Method->getLocation(), diag::err_member_function_initialization) 6014 << Method->getDeclName() << Init->getSourceRange(); 6015 Method->setInvalidDecl(); 6016 } 6017 return; 6018 } 6019 6020 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6021 if (!VDecl) { 6022 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 6023 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6024 RealDecl->setInvalidDecl(); 6025 return; 6026 } 6027 6028 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6029 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6030 TypeSourceInfo *DeducedType = 0; 6031 if (DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType) == 6032 DAR_Failed) 6033 DiagnoseAutoDeductionFailure(VDecl, Init); 6034 if (!DeducedType) { 6035 RealDecl->setInvalidDecl(); 6036 return; 6037 } 6038 VDecl->setTypeSourceInfo(DeducedType); 6039 VDecl->setType(DeducedType->getType()); 6040 6041 // In ARC, infer lifetime. 6042 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 6043 VDecl->setInvalidDecl(); 6044 6045 // If this is a redeclaration, check that the type we just deduced matches 6046 // the previously declared type. 6047 if (VarDecl *Old = VDecl->getPreviousDecl()) 6048 MergeVarDeclTypes(VDecl, Old); 6049 } 6050 6051 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 6052 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 6053 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6054 VDecl->setInvalidDecl(); 6055 return; 6056 } 6057 6058 6059 // A definition must end up with a complete type, which means it must be 6060 // complete with the restriction that an array type might be completed by the 6061 // initializer; note that later code assumes this restriction. 6062 QualType BaseDeclType = VDecl->getType(); 6063 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 6064 BaseDeclType = Array->getElementType(); 6065 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 6066 diag::err_typecheck_decl_incomplete_type)) { 6067 RealDecl->setInvalidDecl(); 6068 return; 6069 } 6070 6071 // The variable can not have an abstract class type. 6072 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6073 diag::err_abstract_type_in_decl, 6074 AbstractVariableType)) 6075 VDecl->setInvalidDecl(); 6076 6077 const VarDecl *Def; 6078 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6079 Diag(VDecl->getLocation(), diag::err_redefinition) 6080 << VDecl->getDeclName(); 6081 Diag(Def->getLocation(), diag::note_previous_definition); 6082 VDecl->setInvalidDecl(); 6083 return; 6084 } 6085 6086 const VarDecl* PrevInit = 0; 6087 if (getLangOptions().CPlusPlus) { 6088 // C++ [class.static.data]p4 6089 // If a static data member is of const integral or const 6090 // enumeration type, its declaration in the class definition can 6091 // specify a constant-initializer which shall be an integral 6092 // constant expression (5.19). In that case, the member can appear 6093 // in integral constant expressions. The member shall still be 6094 // defined in a namespace scope if it is used in the program and the 6095 // namespace scope definition shall not contain an initializer. 6096 // 6097 // We already performed a redefinition check above, but for static 6098 // data members we also need to check whether there was an in-class 6099 // declaration with an initializer. 6100 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6101 Diag(VDecl->getLocation(), diag::err_redefinition) 6102 << VDecl->getDeclName(); 6103 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6104 return; 6105 } 6106 6107 if (VDecl->hasLocalStorage()) 6108 getCurFunction()->setHasBranchProtectedScope(); 6109 6110 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6111 VDecl->setInvalidDecl(); 6112 return; 6113 } 6114 } 6115 6116 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6117 // a kernel function cannot be initialized." 6118 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6119 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6120 VDecl->setInvalidDecl(); 6121 return; 6122 } 6123 6124 // Get the decls type and save a reference for later, since 6125 // CheckInitializerTypes may change it. 6126 QualType DclT = VDecl->getType(), SavT = DclT; 6127 6128 // Perform the initialization. 6129 if (!VDecl->isInvalidDecl()) { 6130 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6131 InitializationKind Kind 6132 = DirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6133 Init->getLocStart(), 6134 Init->getLocEnd()) 6135 : InitializationKind::CreateCopy(VDecl->getLocation(), 6136 Init->getLocStart()); 6137 6138 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6139 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6140 MultiExprArg(*this, &Init, 1), 6141 &DclT); 6142 if (Result.isInvalid()) { 6143 VDecl->setInvalidDecl(); 6144 return; 6145 } 6146 6147 Init = Result.takeAs<Expr>(); 6148 } 6149 6150 // If the type changed, it means we had an incomplete type that was 6151 // completed by the initializer. For example: 6152 // int ary[] = { 1, 3, 5 }; 6153 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6154 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6155 VDecl->setType(DclT); 6156 Init->setType(DclT.getNonReferenceType()); 6157 } 6158 6159 // Check any implicit conversions within the expression. 6160 CheckImplicitConversions(Init, VDecl->getLocation()); 6161 6162 if (!VDecl->isInvalidDecl()) 6163 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6164 6165 Init = MaybeCreateExprWithCleanups(Init); 6166 // Attach the initializer to the decl. 6167 VDecl->setInit(Init); 6168 6169 if (VDecl->isLocalVarDecl()) { 6170 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6171 // static storage duration shall be constant expressions or string literals. 6172 // C++ does not have this restriction. 6173 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl() && 6174 VDecl->getStorageClass() == SC_Static) 6175 CheckForConstantInitializer(Init, DclT); 6176 } else if (VDecl->isStaticDataMember() && 6177 VDecl->getLexicalDeclContext()->isRecord()) { 6178 // This is an in-class initialization for a static data member, e.g., 6179 // 6180 // struct S { 6181 // static const int value = 17; 6182 // }; 6183 6184 // C++ [class.mem]p4: 6185 // A member-declarator can contain a constant-initializer only 6186 // if it declares a static member (9.4) of const integral or 6187 // const enumeration type, see 9.4.2. 6188 // 6189 // C++11 [class.static.data]p3: 6190 // If a non-volatile const static data member is of integral or 6191 // enumeration type, its declaration in the class definition can 6192 // specify a brace-or-equal-initializer in which every initalizer-clause 6193 // that is an assignment-expression is a constant expression. A static 6194 // data member of literal type can be declared in the class definition 6195 // with the constexpr specifier; if so, its declaration shall specify a 6196 // brace-or-equal-initializer in which every initializer-clause that is 6197 // an assignment-expression is a constant expression. 6198 6199 // Do nothing on dependent types. 6200 if (DclT->isDependentType()) { 6201 6202 // Allow any 'static constexpr' members, whether or not they are of literal 6203 // type. We separately check that the initializer is a constant expression, 6204 // which implicitly requires the member to be of literal type. 6205 } else if (VDecl->isConstexpr()) { 6206 6207 // Require constness. 6208 } else if (!DclT.isConstQualified()) { 6209 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6210 << Init->getSourceRange(); 6211 VDecl->setInvalidDecl(); 6212 6213 // We allow integer constant expressions in all cases. 6214 } else if (DclT->isIntegralOrEnumerationType()) { 6215 // Check whether the expression is a constant expression. 6216 SourceLocation Loc; 6217 if (getLangOptions().CPlusPlus0x && DclT.isVolatileQualified()) 6218 // In C++11, a non-constexpr const static data member with an 6219 // in-class initializer cannot be volatile. 6220 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6221 else if (Init->isValueDependent()) 6222 ; // Nothing to check. 6223 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6224 ; // Ok, it's an ICE! 6225 else if (Init->isEvaluatable(Context)) { 6226 // If we can constant fold the initializer through heroics, accept it, 6227 // but report this as a use of an extension for -pedantic. 6228 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6229 << Init->getSourceRange(); 6230 } else { 6231 // Otherwise, this is some crazy unknown case. Report the issue at the 6232 // location provided by the isIntegerConstantExpr failed check. 6233 Diag(Loc, diag::err_in_class_initializer_non_constant) 6234 << Init->getSourceRange(); 6235 VDecl->setInvalidDecl(); 6236 } 6237 6238 // We allow foldable floating-point constants as an extension. 6239 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6240 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6241 << DclT << Init->getSourceRange(); 6242 if (getLangOptions().CPlusPlus0x) 6243 Diag(VDecl->getLocation(), 6244 diag::note_in_class_initializer_float_type_constexpr) 6245 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6246 6247 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6248 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6249 << Init->getSourceRange(); 6250 VDecl->setInvalidDecl(); 6251 } 6252 6253 // Suggest adding 'constexpr' in C++11 for literal types. 6254 } else if (getLangOptions().CPlusPlus0x && DclT->isLiteralType()) { 6255 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6256 << DclT << Init->getSourceRange() 6257 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6258 VDecl->setConstexpr(true); 6259 6260 } else { 6261 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6262 << DclT << Init->getSourceRange(); 6263 VDecl->setInvalidDecl(); 6264 } 6265 } else if (VDecl->isFileVarDecl()) { 6266 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6267 (!getLangOptions().CPlusPlus || 6268 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6269 Diag(VDecl->getLocation(), diag::warn_extern_init); 6270 6271 // C99 6.7.8p4. All file scoped initializers need to be constant. 6272 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) 6273 CheckForConstantInitializer(Init, DclT); 6274 } 6275 6276 CheckCompleteVariableDeclaration(VDecl); 6277} 6278 6279/// ActOnInitializerError - Given that there was an error parsing an 6280/// initializer for the given declaration, try to return to some form 6281/// of sanity. 6282void Sema::ActOnInitializerError(Decl *D) { 6283 // Our main concern here is re-establishing invariants like "a 6284 // variable's type is either dependent or complete". 6285 if (!D || D->isInvalidDecl()) return; 6286 6287 VarDecl *VD = dyn_cast<VarDecl>(D); 6288 if (!VD) return; 6289 6290 // Auto types are meaningless if we can't make sense of the initializer. 6291 if (ParsingInitForAutoVars.count(D)) { 6292 D->setInvalidDecl(); 6293 return; 6294 } 6295 6296 QualType Ty = VD->getType(); 6297 if (Ty->isDependentType()) return; 6298 6299 // Require a complete type. 6300 if (RequireCompleteType(VD->getLocation(), 6301 Context.getBaseElementType(Ty), 6302 diag::err_typecheck_decl_incomplete_type)) { 6303 VD->setInvalidDecl(); 6304 return; 6305 } 6306 6307 // Require an abstract type. 6308 if (RequireNonAbstractType(VD->getLocation(), Ty, 6309 diag::err_abstract_type_in_decl, 6310 AbstractVariableType)) { 6311 VD->setInvalidDecl(); 6312 return; 6313 } 6314 6315 // Don't bother complaining about constructors or destructors, 6316 // though. 6317} 6318 6319void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6320 bool TypeMayContainAuto) { 6321 // If there is no declaration, there was an error parsing it. Just ignore it. 6322 if (RealDecl == 0) 6323 return; 6324 6325 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6326 QualType Type = Var->getType(); 6327 6328 // C++11 [dcl.spec.auto]p3 6329 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6330 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6331 << Var->getDeclName() << Type; 6332 Var->setInvalidDecl(); 6333 return; 6334 } 6335 6336 // C++11 [class.static.data]p3: A static data member can be declared with 6337 // the constexpr specifier; if so, its declaration shall specify 6338 // a brace-or-equal-initializer. 6339 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6340 // the definition of a variable [...] or the declaration of a static data 6341 // member. 6342 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6343 if (Var->isStaticDataMember()) 6344 Diag(Var->getLocation(), 6345 diag::err_constexpr_static_mem_var_requires_init) 6346 << Var->getDeclName(); 6347 else 6348 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6349 Var->setInvalidDecl(); 6350 return; 6351 } 6352 6353 switch (Var->isThisDeclarationADefinition()) { 6354 case VarDecl::Definition: 6355 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6356 break; 6357 6358 // We have an out-of-line definition of a static data member 6359 // that has an in-class initializer, so we type-check this like 6360 // a declaration. 6361 // 6362 // Fall through 6363 6364 case VarDecl::DeclarationOnly: 6365 // It's only a declaration. 6366 6367 // Block scope. C99 6.7p7: If an identifier for an object is 6368 // declared with no linkage (C99 6.2.2p6), the type for the 6369 // object shall be complete. 6370 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6371 !Var->getLinkage() && !Var->isInvalidDecl() && 6372 RequireCompleteType(Var->getLocation(), Type, 6373 diag::err_typecheck_decl_incomplete_type)) 6374 Var->setInvalidDecl(); 6375 6376 // Make sure that the type is not abstract. 6377 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6378 RequireNonAbstractType(Var->getLocation(), Type, 6379 diag::err_abstract_type_in_decl, 6380 AbstractVariableType)) 6381 Var->setInvalidDecl(); 6382 return; 6383 6384 case VarDecl::TentativeDefinition: 6385 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6386 // object that has file scope without an initializer, and without a 6387 // storage-class specifier or with the storage-class specifier "static", 6388 // constitutes a tentative definition. Note: A tentative definition with 6389 // external linkage is valid (C99 6.2.2p5). 6390 if (!Var->isInvalidDecl()) { 6391 if (const IncompleteArrayType *ArrayT 6392 = Context.getAsIncompleteArrayType(Type)) { 6393 if (RequireCompleteType(Var->getLocation(), 6394 ArrayT->getElementType(), 6395 diag::err_illegal_decl_array_incomplete_type)) 6396 Var->setInvalidDecl(); 6397 } else if (Var->getStorageClass() == SC_Static) { 6398 // C99 6.9.2p3: If the declaration of an identifier for an object is 6399 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6400 // declared type shall not be an incomplete type. 6401 // NOTE: code such as the following 6402 // static struct s; 6403 // struct s { int a; }; 6404 // is accepted by gcc. Hence here we issue a warning instead of 6405 // an error and we do not invalidate the static declaration. 6406 // NOTE: to avoid multiple warnings, only check the first declaration. 6407 if (Var->getPreviousDecl() == 0) 6408 RequireCompleteType(Var->getLocation(), Type, 6409 diag::ext_typecheck_decl_incomplete_type); 6410 } 6411 } 6412 6413 // Record the tentative definition; we're done. 6414 if (!Var->isInvalidDecl()) 6415 TentativeDefinitions.push_back(Var); 6416 return; 6417 } 6418 6419 // Provide a specific diagnostic for uninitialized variable 6420 // definitions with incomplete array type. 6421 if (Type->isIncompleteArrayType()) { 6422 Diag(Var->getLocation(), 6423 diag::err_typecheck_incomplete_array_needs_initializer); 6424 Var->setInvalidDecl(); 6425 return; 6426 } 6427 6428 // Provide a specific diagnostic for uninitialized variable 6429 // definitions with reference type. 6430 if (Type->isReferenceType()) { 6431 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6432 << Var->getDeclName() 6433 << SourceRange(Var->getLocation(), Var->getLocation()); 6434 Var->setInvalidDecl(); 6435 return; 6436 } 6437 6438 // Do not attempt to type-check the default initializer for a 6439 // variable with dependent type. 6440 if (Type->isDependentType()) 6441 return; 6442 6443 if (Var->isInvalidDecl()) 6444 return; 6445 6446 if (RequireCompleteType(Var->getLocation(), 6447 Context.getBaseElementType(Type), 6448 diag::err_typecheck_decl_incomplete_type)) { 6449 Var->setInvalidDecl(); 6450 return; 6451 } 6452 6453 // The variable can not have an abstract class type. 6454 if (RequireNonAbstractType(Var->getLocation(), Type, 6455 diag::err_abstract_type_in_decl, 6456 AbstractVariableType)) { 6457 Var->setInvalidDecl(); 6458 return; 6459 } 6460 6461 // Check for jumps past the implicit initializer. C++0x 6462 // clarifies that this applies to a "variable with automatic 6463 // storage duration", not a "local variable". 6464 // C++11 [stmt.dcl]p3 6465 // A program that jumps from a point where a variable with automatic 6466 // storage duration is not in scope to a point where it is in scope is 6467 // ill-formed unless the variable has scalar type, class type with a 6468 // trivial default constructor and a trivial destructor, a cv-qualified 6469 // version of one of these types, or an array of one of the preceding 6470 // types and is declared without an initializer. 6471 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6472 if (const RecordType *Record 6473 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6474 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6475 // Mark the function for further checking even if the looser rules of 6476 // C++11 do not require such checks, so that we can diagnose 6477 // incompatibilities with C++98. 6478 if (!CXXRecord->isPOD()) 6479 getCurFunction()->setHasBranchProtectedScope(); 6480 } 6481 } 6482 6483 // C++03 [dcl.init]p9: 6484 // If no initializer is specified for an object, and the 6485 // object is of (possibly cv-qualified) non-POD class type (or 6486 // array thereof), the object shall be default-initialized; if 6487 // the object is of const-qualified type, the underlying class 6488 // type shall have a user-declared default 6489 // constructor. Otherwise, if no initializer is specified for 6490 // a non- static object, the object and its subobjects, if 6491 // any, have an indeterminate initial value); if the object 6492 // or any of its subobjects are of const-qualified type, the 6493 // program is ill-formed. 6494 // C++0x [dcl.init]p11: 6495 // If no initializer is specified for an object, the object is 6496 // default-initialized; [...]. 6497 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6498 InitializationKind Kind 6499 = InitializationKind::CreateDefault(Var->getLocation()); 6500 6501 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6502 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6503 MultiExprArg(*this, 0, 0)); 6504 if (Init.isInvalid()) 6505 Var->setInvalidDecl(); 6506 else if (Init.get()) 6507 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6508 6509 CheckCompleteVariableDeclaration(Var); 6510 } 6511} 6512 6513void Sema::ActOnCXXForRangeDecl(Decl *D) { 6514 VarDecl *VD = dyn_cast<VarDecl>(D); 6515 if (!VD) { 6516 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6517 D->setInvalidDecl(); 6518 return; 6519 } 6520 6521 VD->setCXXForRangeDecl(true); 6522 6523 // for-range-declaration cannot be given a storage class specifier. 6524 int Error = -1; 6525 switch (VD->getStorageClassAsWritten()) { 6526 case SC_None: 6527 break; 6528 case SC_Extern: 6529 Error = 0; 6530 break; 6531 case SC_Static: 6532 Error = 1; 6533 break; 6534 case SC_PrivateExtern: 6535 Error = 2; 6536 break; 6537 case SC_Auto: 6538 Error = 3; 6539 break; 6540 case SC_Register: 6541 Error = 4; 6542 break; 6543 case SC_OpenCLWorkGroupLocal: 6544 llvm_unreachable("Unexpected storage class"); 6545 } 6546 if (VD->isConstexpr()) 6547 Error = 5; 6548 if (Error != -1) { 6549 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6550 << VD->getDeclName() << Error; 6551 D->setInvalidDecl(); 6552 } 6553} 6554 6555void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6556 if (var->isInvalidDecl()) return; 6557 6558 // In ARC, don't allow jumps past the implicit initialization of a 6559 // local retaining variable. 6560 if (getLangOptions().ObjCAutoRefCount && 6561 var->hasLocalStorage()) { 6562 switch (var->getType().getObjCLifetime()) { 6563 case Qualifiers::OCL_None: 6564 case Qualifiers::OCL_ExplicitNone: 6565 case Qualifiers::OCL_Autoreleasing: 6566 break; 6567 6568 case Qualifiers::OCL_Weak: 6569 case Qualifiers::OCL_Strong: 6570 getCurFunction()->setHasBranchProtectedScope(); 6571 break; 6572 } 6573 } 6574 6575 // All the following checks are C++ only. 6576 if (!getLangOptions().CPlusPlus) return; 6577 6578 QualType baseType = Context.getBaseElementType(var->getType()); 6579 if (baseType->isDependentType()) return; 6580 6581 // __block variables might require us to capture a copy-initializer. 6582 if (var->hasAttr<BlocksAttr>()) { 6583 // It's currently invalid to ever have a __block variable with an 6584 // array type; should we diagnose that here? 6585 6586 // Regardless, we don't want to ignore array nesting when 6587 // constructing this copy. 6588 QualType type = var->getType(); 6589 6590 if (type->isStructureOrClassType()) { 6591 SourceLocation poi = var->getLocation(); 6592 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6593 ExprResult result = 6594 PerformCopyInitialization( 6595 InitializedEntity::InitializeBlock(poi, type, false), 6596 poi, Owned(varRef)); 6597 if (!result.isInvalid()) { 6598 result = MaybeCreateExprWithCleanups(result); 6599 Expr *init = result.takeAs<Expr>(); 6600 Context.setBlockVarCopyInits(var, init); 6601 } 6602 } 6603 } 6604 6605 Expr *Init = var->getInit(); 6606 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6607 6608 if (!var->getDeclContext()->isDependentContext() && Init) { 6609 if (IsGlobal && !var->isConstexpr() && 6610 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6611 var->getLocation()) 6612 != DiagnosticsEngine::Ignored && 6613 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 6614 Diag(var->getLocation(), diag::warn_global_constructor) 6615 << Init->getSourceRange(); 6616 6617 if (var->isConstexpr()) { 6618 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 6619 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 6620 SourceLocation DiagLoc = var->getLocation(); 6621 // If the note doesn't add any useful information other than a source 6622 // location, fold it into the primary diagnostic. 6623 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 6624 diag::note_invalid_subexpr_in_const_expr) { 6625 DiagLoc = Notes[0].first; 6626 Notes.clear(); 6627 } 6628 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 6629 << var << Init->getSourceRange(); 6630 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 6631 Diag(Notes[I].first, Notes[I].second); 6632 } 6633 } else if (var->isUsableInConstantExpressions()) { 6634 // Check whether the initializer of a const variable of integral or 6635 // enumeration type is an ICE now, since we can't tell whether it was 6636 // initialized by a constant expression if we check later. 6637 var->checkInitIsICE(); 6638 } 6639 } 6640 6641 // Require the destructor. 6642 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6643 FinalizeVarWithDestructor(var, recordType); 6644} 6645 6646/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6647/// any semantic actions necessary after any initializer has been attached. 6648void 6649Sema::FinalizeDeclaration(Decl *ThisDecl) { 6650 // Note that we are no longer parsing the initializer for this declaration. 6651 ParsingInitForAutoVars.erase(ThisDecl); 6652} 6653 6654Sema::DeclGroupPtrTy 6655Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6656 Decl **Group, unsigned NumDecls) { 6657 SmallVector<Decl*, 8> Decls; 6658 6659 if (DS.isTypeSpecOwned()) 6660 Decls.push_back(DS.getRepAsDecl()); 6661 6662 for (unsigned i = 0; i != NumDecls; ++i) 6663 if (Decl *D = Group[i]) 6664 Decls.push_back(D); 6665 6666 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6667 DS.getTypeSpecType() == DeclSpec::TST_auto); 6668} 6669 6670/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6671/// group, performing any necessary semantic checking. 6672Sema::DeclGroupPtrTy 6673Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6674 bool TypeMayContainAuto) { 6675 // C++0x [dcl.spec.auto]p7: 6676 // If the type deduced for the template parameter U is not the same in each 6677 // deduction, the program is ill-formed. 6678 // FIXME: When initializer-list support is added, a distinction is needed 6679 // between the deduced type U and the deduced type which 'auto' stands for. 6680 // auto a = 0, b = { 1, 2, 3 }; 6681 // is legal because the deduced type U is 'int' in both cases. 6682 if (TypeMayContainAuto && NumDecls > 1) { 6683 QualType Deduced; 6684 CanQualType DeducedCanon; 6685 VarDecl *DeducedDecl = 0; 6686 for (unsigned i = 0; i != NumDecls; ++i) { 6687 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6688 AutoType *AT = D->getType()->getContainedAutoType(); 6689 // Don't reissue diagnostics when instantiating a template. 6690 if (AT && D->isInvalidDecl()) 6691 break; 6692 if (AT && AT->isDeduced()) { 6693 QualType U = AT->getDeducedType(); 6694 CanQualType UCanon = Context.getCanonicalType(U); 6695 if (Deduced.isNull()) { 6696 Deduced = U; 6697 DeducedCanon = UCanon; 6698 DeducedDecl = D; 6699 } else if (DeducedCanon != UCanon) { 6700 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6701 diag::err_auto_different_deductions) 6702 << Deduced << DeducedDecl->getDeclName() 6703 << U << D->getDeclName() 6704 << DeducedDecl->getInit()->getSourceRange() 6705 << D->getInit()->getSourceRange(); 6706 D->setInvalidDecl(); 6707 break; 6708 } 6709 } 6710 } 6711 } 6712 } 6713 6714 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6715} 6716 6717 6718/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6719/// to introduce parameters into function prototype scope. 6720Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6721 const DeclSpec &DS = D.getDeclSpec(); 6722 6723 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6724 // C++03 [dcl.stc]p2 also permits 'auto'. 6725 VarDecl::StorageClass StorageClass = SC_None; 6726 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6727 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6728 StorageClass = SC_Register; 6729 StorageClassAsWritten = SC_Register; 6730 } else if (getLangOptions().CPlusPlus && 6731 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6732 StorageClass = SC_Auto; 6733 StorageClassAsWritten = SC_Auto; 6734 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6735 Diag(DS.getStorageClassSpecLoc(), 6736 diag::err_invalid_storage_class_in_func_decl); 6737 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6738 } 6739 6740 if (D.getDeclSpec().isThreadSpecified()) 6741 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6742 if (D.getDeclSpec().isConstexprSpecified()) 6743 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6744 << 0; 6745 6746 DiagnoseFunctionSpecifiers(D); 6747 6748 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6749 QualType parmDeclType = TInfo->getType(); 6750 6751 if (getLangOptions().CPlusPlus) { 6752 // Check that there are no default arguments inside the type of this 6753 // parameter. 6754 CheckExtraCXXDefaultArguments(D); 6755 6756 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6757 if (D.getCXXScopeSpec().isSet()) { 6758 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6759 << D.getCXXScopeSpec().getRange(); 6760 D.getCXXScopeSpec().clear(); 6761 } 6762 } 6763 6764 // Ensure we have a valid name 6765 IdentifierInfo *II = 0; 6766 if (D.hasName()) { 6767 II = D.getIdentifier(); 6768 if (!II) { 6769 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6770 << GetNameForDeclarator(D).getName().getAsString(); 6771 D.setInvalidType(true); 6772 } 6773 } 6774 6775 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6776 if (II) { 6777 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6778 ForRedeclaration); 6779 LookupName(R, S); 6780 if (R.isSingleResult()) { 6781 NamedDecl *PrevDecl = R.getFoundDecl(); 6782 if (PrevDecl->isTemplateParameter()) { 6783 // Maybe we will complain about the shadowed template parameter. 6784 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6785 // Just pretend that we didn't see the previous declaration. 6786 PrevDecl = 0; 6787 } else if (S->isDeclScope(PrevDecl)) { 6788 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6789 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6790 6791 // Recover by removing the name 6792 II = 0; 6793 D.SetIdentifier(0, D.getIdentifierLoc()); 6794 D.setInvalidType(true); 6795 } 6796 } 6797 } 6798 6799 // Temporarily put parameter variables in the translation unit, not 6800 // the enclosing context. This prevents them from accidentally 6801 // looking like class members in C++. 6802 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6803 D.getSourceRange().getBegin(), 6804 D.getIdentifierLoc(), II, 6805 parmDeclType, TInfo, 6806 StorageClass, StorageClassAsWritten); 6807 6808 if (D.isInvalidType()) 6809 New->setInvalidDecl(); 6810 6811 assert(S->isFunctionPrototypeScope()); 6812 assert(S->getFunctionPrototypeDepth() >= 1); 6813 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6814 S->getNextFunctionPrototypeIndex()); 6815 6816 // Add the parameter declaration into this scope. 6817 S->AddDecl(New); 6818 if (II) 6819 IdResolver.AddDecl(New); 6820 6821 ProcessDeclAttributes(S, New, D); 6822 6823 if (D.getDeclSpec().isModulePrivateSpecified()) 6824 Diag(New->getLocation(), diag::err_module_private_local) 6825 << 1 << New->getDeclName() 6826 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6827 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6828 6829 if (New->hasAttr<BlocksAttr>()) { 6830 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6831 } 6832 return New; 6833} 6834 6835/// \brief Synthesizes a variable for a parameter arising from a 6836/// typedef. 6837ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6838 SourceLocation Loc, 6839 QualType T) { 6840 /* FIXME: setting StartLoc == Loc. 6841 Would it be worth to modify callers so as to provide proper source 6842 location for the unnamed parameters, embedding the parameter's type? */ 6843 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6844 T, Context.getTrivialTypeSourceInfo(T, Loc), 6845 SC_None, SC_None, 0); 6846 Param->setImplicit(); 6847 return Param; 6848} 6849 6850void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6851 ParmVarDecl * const *ParamEnd) { 6852 // Don't diagnose unused-parameter errors in template instantiations; we 6853 // will already have done so in the template itself. 6854 if (!ActiveTemplateInstantiations.empty()) 6855 return; 6856 6857 for (; Param != ParamEnd; ++Param) { 6858 if (!(*Param)->isReferenced() && (*Param)->getDeclName() && 6859 !(*Param)->hasAttr<UnusedAttr>()) { 6860 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6861 << (*Param)->getDeclName(); 6862 } 6863 } 6864} 6865 6866void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6867 ParmVarDecl * const *ParamEnd, 6868 QualType ReturnTy, 6869 NamedDecl *D) { 6870 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6871 return; 6872 6873 // Warn if the return value is pass-by-value and larger than the specified 6874 // threshold. 6875 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 6876 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6877 if (Size > LangOpts.NumLargeByValueCopy) 6878 Diag(D->getLocation(), diag::warn_return_value_size) 6879 << D->getDeclName() << Size; 6880 } 6881 6882 // Warn if any parameter is pass-by-value and larger than the specified 6883 // threshold. 6884 for (; Param != ParamEnd; ++Param) { 6885 QualType T = (*Param)->getType(); 6886 if (T->isDependentType() || !T.isPODType(Context)) 6887 continue; 6888 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6889 if (Size > LangOpts.NumLargeByValueCopy) 6890 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6891 << (*Param)->getDeclName() << Size; 6892 } 6893} 6894 6895ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6896 SourceLocation NameLoc, IdentifierInfo *Name, 6897 QualType T, TypeSourceInfo *TSInfo, 6898 VarDecl::StorageClass StorageClass, 6899 VarDecl::StorageClass StorageClassAsWritten) { 6900 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6901 if (getLangOptions().ObjCAutoRefCount && 6902 T.getObjCLifetime() == Qualifiers::OCL_None && 6903 T->isObjCLifetimeType()) { 6904 6905 Qualifiers::ObjCLifetime lifetime; 6906 6907 // Special cases for arrays: 6908 // - if it's const, use __unsafe_unretained 6909 // - otherwise, it's an error 6910 if (T->isArrayType()) { 6911 if (!T.isConstQualified()) { 6912 DelayedDiagnostics.add( 6913 sema::DelayedDiagnostic::makeForbiddenType( 6914 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6915 } 6916 lifetime = Qualifiers::OCL_ExplicitNone; 6917 } else { 6918 lifetime = T->getObjCARCImplicitLifetime(); 6919 } 6920 T = Context.getLifetimeQualifiedType(T, lifetime); 6921 } 6922 6923 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6924 Context.getAdjustedParameterType(T), 6925 TSInfo, 6926 StorageClass, StorageClassAsWritten, 6927 0); 6928 6929 // Parameters can not be abstract class types. 6930 // For record types, this is done by the AbstractClassUsageDiagnoser once 6931 // the class has been completely parsed. 6932 if (!CurContext->isRecord() && 6933 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6934 AbstractParamType)) 6935 New->setInvalidDecl(); 6936 6937 // Parameter declarators cannot be interface types. All ObjC objects are 6938 // passed by reference. 6939 if (T->isObjCObjectType()) { 6940 Diag(NameLoc, 6941 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6942 << FixItHint::CreateInsertion(NameLoc, "*"); 6943 T = Context.getObjCObjectPointerType(T); 6944 New->setType(T); 6945 } 6946 6947 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6948 // duration shall not be qualified by an address-space qualifier." 6949 // Since all parameters have automatic store duration, they can not have 6950 // an address space. 6951 if (T.getAddressSpace() != 0) { 6952 Diag(NameLoc, diag::err_arg_with_address_space); 6953 New->setInvalidDecl(); 6954 } 6955 6956 return New; 6957} 6958 6959void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6960 SourceLocation LocAfterDecls) { 6961 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6962 6963 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6964 // for a K&R function. 6965 if (!FTI.hasPrototype) { 6966 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6967 --i; 6968 if (FTI.ArgInfo[i].Param == 0) { 6969 llvm::SmallString<256> Code; 6970 llvm::raw_svector_ostream(Code) << " int " 6971 << FTI.ArgInfo[i].Ident->getName() 6972 << ";\n"; 6973 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6974 << FTI.ArgInfo[i].Ident 6975 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6976 6977 // Implicitly declare the argument as type 'int' for lack of a better 6978 // type. 6979 AttributeFactory attrs; 6980 DeclSpec DS(attrs); 6981 const char* PrevSpec; // unused 6982 unsigned DiagID; // unused 6983 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6984 PrevSpec, DiagID); 6985 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6986 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6987 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6988 } 6989 } 6990 } 6991} 6992 6993Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6994 Declarator &D) { 6995 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6996 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6997 Scope *ParentScope = FnBodyScope->getParent(); 6998 6999 D.setFunctionDefinitionKind(FDK_Definition); 7000 Decl *DP = HandleDeclarator(ParentScope, D, 7001 MultiTemplateParamsArg(*this)); 7002 return ActOnStartOfFunctionDef(FnBodyScope, DP); 7003} 7004 7005static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 7006 // Don't warn about invalid declarations. 7007 if (FD->isInvalidDecl()) 7008 return false; 7009 7010 // Or declarations that aren't global. 7011 if (!FD->isGlobal()) 7012 return false; 7013 7014 // Don't warn about C++ member functions. 7015 if (isa<CXXMethodDecl>(FD)) 7016 return false; 7017 7018 // Don't warn about 'main'. 7019 if (FD->isMain()) 7020 return false; 7021 7022 // Don't warn about inline functions. 7023 if (FD->isInlined()) 7024 return false; 7025 7026 // Don't warn about function templates. 7027 if (FD->getDescribedFunctionTemplate()) 7028 return false; 7029 7030 // Don't warn about function template specializations. 7031 if (FD->isFunctionTemplateSpecialization()) 7032 return false; 7033 7034 bool MissingPrototype = true; 7035 for (const FunctionDecl *Prev = FD->getPreviousDecl(); 7036 Prev; Prev = Prev->getPreviousDecl()) { 7037 // Ignore any declarations that occur in function or method 7038 // scope, because they aren't visible from the header. 7039 if (Prev->getDeclContext()->isFunctionOrMethod()) 7040 continue; 7041 7042 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 7043 break; 7044 } 7045 7046 return MissingPrototype; 7047} 7048 7049void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 7050 // Don't complain if we're in GNU89 mode and the previous definition 7051 // was an extern inline function. 7052 const FunctionDecl *Definition; 7053 if (FD->isDefined(Definition) && 7054 !canRedefineFunction(Definition, getLangOptions())) { 7055 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 7056 Definition->getStorageClass() == SC_Extern) 7057 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 7058 << FD->getDeclName() << getLangOptions().CPlusPlus; 7059 else 7060 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 7061 Diag(Definition->getLocation(), diag::note_previous_definition); 7062 } 7063} 7064 7065Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 7066 // Clear the last template instantiation error context. 7067 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 7068 7069 if (!D) 7070 return D; 7071 FunctionDecl *FD = 0; 7072 7073 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 7074 FD = FunTmpl->getTemplatedDecl(); 7075 else 7076 FD = cast<FunctionDecl>(D); 7077 7078 // Enter a new function scope 7079 PushFunctionScope(); 7080 7081 // See if this is a redefinition. 7082 if (!FD->isLateTemplateParsed()) 7083 CheckForFunctionRedefinition(FD); 7084 7085 // Builtin functions cannot be defined. 7086 if (unsigned BuiltinID = FD->getBuiltinID()) { 7087 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7088 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7089 FD->setInvalidDecl(); 7090 } 7091 } 7092 7093 // The return type of a function definition must be complete 7094 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7095 QualType ResultType = FD->getResultType(); 7096 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7097 !FD->isInvalidDecl() && 7098 RequireCompleteType(FD->getLocation(), ResultType, 7099 diag::err_func_def_incomplete_result)) 7100 FD->setInvalidDecl(); 7101 7102 // GNU warning -Wmissing-prototypes: 7103 // Warn if a global function is defined without a previous 7104 // prototype declaration. This warning is issued even if the 7105 // definition itself provides a prototype. The aim is to detect 7106 // global functions that fail to be declared in header files. 7107 if (ShouldWarnAboutMissingPrototype(FD)) 7108 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7109 7110 if (FnBodyScope) 7111 PushDeclContext(FnBodyScope, FD); 7112 7113 // Check the validity of our function parameters 7114 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7115 /*CheckParameterNames=*/true); 7116 7117 // Introduce our parameters into the function scope 7118 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7119 ParmVarDecl *Param = FD->getParamDecl(p); 7120 Param->setOwningFunction(FD); 7121 7122 // If this has an identifier, add it to the scope stack. 7123 if (Param->getIdentifier() && FnBodyScope) { 7124 CheckShadow(FnBodyScope, Param); 7125 7126 PushOnScopeChains(Param, FnBodyScope); 7127 } 7128 } 7129 7130 // Checking attributes of current function definition 7131 // dllimport attribute. 7132 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7133 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7134 // dllimport attribute cannot be directly applied to definition. 7135 // Microsoft accepts dllimport for functions defined within class scope. 7136 if (!DA->isInherited() && 7137 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7138 Diag(FD->getLocation(), 7139 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7140 << "dllimport"; 7141 FD->setInvalidDecl(); 7142 return FD; 7143 } 7144 7145 // Visual C++ appears to not think this is an issue, so only issue 7146 // a warning when Microsoft extensions are disabled. 7147 if (!LangOpts.MicrosoftExt) { 7148 // If a symbol previously declared dllimport is later defined, the 7149 // attribute is ignored in subsequent references, and a warning is 7150 // emitted. 7151 Diag(FD->getLocation(), 7152 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7153 << FD->getName() << "dllimport"; 7154 } 7155 } 7156 return FD; 7157} 7158 7159/// \brief Given the set of return statements within a function body, 7160/// compute the variables that are subject to the named return value 7161/// optimization. 7162/// 7163/// Each of the variables that is subject to the named return value 7164/// optimization will be marked as NRVO variables in the AST, and any 7165/// return statement that has a marked NRVO variable as its NRVO candidate can 7166/// use the named return value optimization. 7167/// 7168/// This function applies a very simplistic algorithm for NRVO: if every return 7169/// statement in the function has the same NRVO candidate, that candidate is 7170/// the NRVO variable. 7171/// 7172/// FIXME: Employ a smarter algorithm that accounts for multiple return 7173/// statements and the lifetimes of the NRVO candidates. We should be able to 7174/// find a maximal set of NRVO variables. 7175void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7176 ReturnStmt **Returns = Scope->Returns.data(); 7177 7178 const VarDecl *NRVOCandidate = 0; 7179 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7180 if (!Returns[I]->getNRVOCandidate()) 7181 return; 7182 7183 if (!NRVOCandidate) 7184 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7185 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7186 return; 7187 } 7188 7189 if (NRVOCandidate) 7190 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7191} 7192 7193Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7194 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7195} 7196 7197Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7198 bool IsInstantiation) { 7199 FunctionDecl *FD = 0; 7200 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7201 if (FunTmpl) 7202 FD = FunTmpl->getTemplatedDecl(); 7203 else 7204 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7205 7206 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7207 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7208 7209 if (FD) { 7210 FD->setBody(Body); 7211 if (FD->isMain()) { 7212 // C and C++ allow for main to automagically return 0. 7213 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7214 FD->setHasImplicitReturnZero(true); 7215 WP.disableCheckFallThrough(); 7216 } else if (FD->hasAttr<NakedAttr>()) { 7217 // If the function is marked 'naked', don't complain about missing return 7218 // statements. 7219 WP.disableCheckFallThrough(); 7220 } 7221 7222 // MSVC permits the use of pure specifier (=0) on function definition, 7223 // defined at class scope, warn about this non standard construct. 7224 if (getLangOptions().MicrosoftExt && FD->isPure()) 7225 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7226 7227 if (!FD->isInvalidDecl()) { 7228 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7229 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7230 FD->getResultType(), FD); 7231 7232 // If this is a constructor, we need a vtable. 7233 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7234 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7235 7236 computeNRVO(Body, getCurFunction()); 7237 } 7238 7239 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7240 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7241 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7242 MD->setBody(Body); 7243 if (Body) 7244 MD->setEndLoc(Body->getLocEnd()); 7245 if (!MD->isInvalidDecl()) { 7246 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7247 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7248 MD->getResultType(), MD); 7249 7250 if (Body) 7251 computeNRVO(Body, getCurFunction()); 7252 } 7253 if (ObjCShouldCallSuperDealloc) { 7254 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7255 ObjCShouldCallSuperDealloc = false; 7256 } 7257 if (ObjCShouldCallSuperFinalize) { 7258 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7259 ObjCShouldCallSuperFinalize = false; 7260 } 7261 } else { 7262 return 0; 7263 } 7264 7265 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7266 "ObjC methods, which should have been handled in the block above."); 7267 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7268 "ObjC methods, which should have been handled in the block above."); 7269 7270 // Verify and clean out per-function state. 7271 if (Body) { 7272 // C++ constructors that have function-try-blocks can't have return 7273 // statements in the handlers of that block. (C++ [except.handle]p14) 7274 // Verify this. 7275 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7276 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7277 7278 // Verify that gotos and switch cases don't jump into scopes illegally. 7279 if (getCurFunction()->NeedsScopeChecking() && 7280 !dcl->isInvalidDecl() && 7281 !hasAnyUnrecoverableErrorsInThisFunction()) 7282 DiagnoseInvalidJumps(Body); 7283 7284 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7285 if (!Destructor->getParent()->isDependentType()) 7286 CheckDestructor(Destructor); 7287 7288 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7289 Destructor->getParent()); 7290 } 7291 7292 // If any errors have occurred, clear out any temporaries that may have 7293 // been leftover. This ensures that these temporaries won't be picked up for 7294 // deletion in some later function. 7295 if (PP.getDiagnostics().hasErrorOccurred() || 7296 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7297 DiscardCleanupsInEvaluationContext(); 7298 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7299 // Since the body is valid, issue any analysis-based warnings that are 7300 // enabled. 7301 ActivePolicy = &WP; 7302 } 7303 7304 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7305 !CheckConstexprFunctionBody(FD, Body)) 7306 FD->setInvalidDecl(); 7307 7308 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7309 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7310 assert(MaybeODRUseExprs.empty() && 7311 "Leftover expressions for odr-use checking"); 7312 } 7313 7314 if (!IsInstantiation) 7315 PopDeclContext(); 7316 7317 PopFunctionScopeInfo(ActivePolicy, dcl); 7318 7319 // If any errors have occurred, clear out any temporaries that may have 7320 // been leftover. This ensures that these temporaries won't be picked up for 7321 // deletion in some later function. 7322 if (getDiagnostics().hasErrorOccurred()) { 7323 DiscardCleanupsInEvaluationContext(); 7324 } 7325 7326 return dcl; 7327} 7328 7329 7330/// When we finish delayed parsing of an attribute, we must attach it to the 7331/// relevant Decl. 7332void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7333 ParsedAttributes &Attrs) { 7334 // Always attach attributes to the underlying decl. 7335 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) 7336 D = TD->getTemplatedDecl(); 7337 ProcessDeclAttributeList(S, D, Attrs.getList()); 7338} 7339 7340 7341/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7342/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7343NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7344 IdentifierInfo &II, Scope *S) { 7345 // Before we produce a declaration for an implicitly defined 7346 // function, see whether there was a locally-scoped declaration of 7347 // this name as a function or variable. If so, use that 7348 // (non-visible) declaration, and complain about it. 7349 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7350 = findLocallyScopedExternalDecl(&II); 7351 if (Pos != LocallyScopedExternalDecls.end()) { 7352 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7353 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7354 return Pos->second; 7355 } 7356 7357 // Extension in C99. Legal in C90, but warn about it. 7358 unsigned diag_id; 7359 if (II.getName().startswith("__builtin_")) 7360 diag_id = diag::warn_builtin_unknown; 7361 else if (getLangOptions().C99) 7362 diag_id = diag::ext_implicit_function_decl; 7363 else 7364 diag_id = diag::warn_implicit_function_decl; 7365 Diag(Loc, diag_id) << &II; 7366 7367 // Because typo correction is expensive, only do it if the implicit 7368 // function declaration is going to be treated as an error. 7369 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7370 TypoCorrection Corrected; 7371 DeclFilterCCC<FunctionDecl> Validator; 7372 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7373 LookupOrdinaryName, S, 0, Validator))) { 7374 std::string CorrectedStr = Corrected.getAsString(getLangOptions()); 7375 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOptions()); 7376 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>(); 7377 7378 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7379 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7380 7381 if (Func->getLocation().isValid() 7382 && !II.getName().startswith("__builtin_")) 7383 Diag(Func->getLocation(), diag::note_previous_decl) 7384 << CorrectedQuotedStr; 7385 } 7386 } 7387 7388 // Set a Declarator for the implicit definition: int foo(); 7389 const char *Dummy; 7390 AttributeFactory attrFactory; 7391 DeclSpec DS(attrFactory); 7392 unsigned DiagID; 7393 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7394 (void)Error; // Silence warning. 7395 assert(!Error && "Error setting up implicit decl!"); 7396 Declarator D(DS, Declarator::BlockContext); 7397 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7398 0, 0, true, SourceLocation(), 7399 SourceLocation(), SourceLocation(), 7400 SourceLocation(), 7401 EST_None, SourceLocation(), 7402 0, 0, 0, 0, Loc, Loc, D), 7403 DS.getAttributes(), 7404 SourceLocation()); 7405 D.SetIdentifier(&II, Loc); 7406 7407 // Insert this function into translation-unit scope. 7408 7409 DeclContext *PrevDC = CurContext; 7410 CurContext = Context.getTranslationUnitDecl(); 7411 7412 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7413 FD->setImplicit(); 7414 7415 CurContext = PrevDC; 7416 7417 AddKnownFunctionAttributes(FD); 7418 7419 return FD; 7420} 7421 7422/// \brief Adds any function attributes that we know a priori based on 7423/// the declaration of this function. 7424/// 7425/// These attributes can apply both to implicitly-declared builtins 7426/// (like __builtin___printf_chk) or to library-declared functions 7427/// like NSLog or printf. 7428/// 7429/// We need to check for duplicate attributes both here and where user-written 7430/// attributes are applied to declarations. 7431void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7432 if (FD->isInvalidDecl()) 7433 return; 7434 7435 // If this is a built-in function, map its builtin attributes to 7436 // actual attributes. 7437 if (unsigned BuiltinID = FD->getBuiltinID()) { 7438 // Handle printf-formatting attributes. 7439 unsigned FormatIdx; 7440 bool HasVAListArg; 7441 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7442 if (!FD->getAttr<FormatAttr>()) { 7443 const char *fmt = "printf"; 7444 unsigned int NumParams = FD->getNumParams(); 7445 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf) 7446 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType()) 7447 fmt = "NSString"; 7448 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7449 fmt, FormatIdx+1, 7450 HasVAListArg ? 0 : FormatIdx+2)); 7451 } 7452 } 7453 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7454 HasVAListArg)) { 7455 if (!FD->getAttr<FormatAttr>()) 7456 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7457 "scanf", FormatIdx+1, 7458 HasVAListArg ? 0 : FormatIdx+2)); 7459 } 7460 7461 // Mark const if we don't care about errno and that is the only 7462 // thing preventing the function from being const. This allows 7463 // IRgen to use LLVM intrinsics for such functions. 7464 if (!getLangOptions().MathErrno && 7465 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7466 if (!FD->getAttr<ConstAttr>()) 7467 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7468 } 7469 7470 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7471 !FD->getAttr<ReturnsTwiceAttr>()) 7472 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7473 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7474 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7475 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7476 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7477 } 7478 7479 IdentifierInfo *Name = FD->getIdentifier(); 7480 if (!Name) 7481 return; 7482 if ((!getLangOptions().CPlusPlus && 7483 FD->getDeclContext()->isTranslationUnit()) || 7484 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7485 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7486 LinkageSpecDecl::lang_c)) { 7487 // Okay: this could be a libc/libm/Objective-C function we know 7488 // about. 7489 } else 7490 return; 7491 7492 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7493 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7494 // target-specific builtins, perhaps? 7495 if (!FD->getAttr<FormatAttr>()) 7496 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7497 "printf", 2, 7498 Name->isStr("vasprintf") ? 0 : 3)); 7499 } 7500} 7501 7502TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7503 TypeSourceInfo *TInfo) { 7504 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7505 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7506 7507 if (!TInfo) { 7508 assert(D.isInvalidType() && "no declarator info for valid type"); 7509 TInfo = Context.getTrivialTypeSourceInfo(T); 7510 } 7511 7512 // Scope manipulation handled by caller. 7513 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7514 D.getSourceRange().getBegin(), 7515 D.getIdentifierLoc(), 7516 D.getIdentifier(), 7517 TInfo); 7518 7519 // Bail out immediately if we have an invalid declaration. 7520 if (D.isInvalidType()) { 7521 NewTD->setInvalidDecl(); 7522 return NewTD; 7523 } 7524 7525 if (D.getDeclSpec().isModulePrivateSpecified()) { 7526 if (CurContext->isFunctionOrMethod()) 7527 Diag(NewTD->getLocation(), diag::err_module_private_local) 7528 << 2 << NewTD->getDeclName() 7529 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7530 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7531 else 7532 NewTD->setModulePrivate(); 7533 } 7534 7535 // C++ [dcl.typedef]p8: 7536 // If the typedef declaration defines an unnamed class (or 7537 // enum), the first typedef-name declared by the declaration 7538 // to be that class type (or enum type) is used to denote the 7539 // class type (or enum type) for linkage purposes only. 7540 // We need to check whether the type was declared in the declaration. 7541 switch (D.getDeclSpec().getTypeSpecType()) { 7542 case TST_enum: 7543 case TST_struct: 7544 case TST_union: 7545 case TST_class: { 7546 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7547 7548 // Do nothing if the tag is not anonymous or already has an 7549 // associated typedef (from an earlier typedef in this decl group). 7550 if (tagFromDeclSpec->getIdentifier()) break; 7551 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7552 7553 // A well-formed anonymous tag must always be a TUK_Definition. 7554 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7555 7556 // The type must match the tag exactly; no qualifiers allowed. 7557 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7558 break; 7559 7560 // Otherwise, set this is the anon-decl typedef for the tag. 7561 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7562 break; 7563 } 7564 7565 default: 7566 break; 7567 } 7568 7569 return NewTD; 7570} 7571 7572 7573/// \brief Determine whether a tag with a given kind is acceptable 7574/// as a redeclaration of the given tag declaration. 7575/// 7576/// \returns true if the new tag kind is acceptable, false otherwise. 7577bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7578 TagTypeKind NewTag, bool isDefinition, 7579 SourceLocation NewTagLoc, 7580 const IdentifierInfo &Name) { 7581 // C++ [dcl.type.elab]p3: 7582 // The class-key or enum keyword present in the 7583 // elaborated-type-specifier shall agree in kind with the 7584 // declaration to which the name in the elaborated-type-specifier 7585 // refers. This rule also applies to the form of 7586 // elaborated-type-specifier that declares a class-name or 7587 // friend class since it can be construed as referring to the 7588 // definition of the class. Thus, in any 7589 // elaborated-type-specifier, the enum keyword shall be used to 7590 // refer to an enumeration (7.2), the union class-key shall be 7591 // used to refer to a union (clause 9), and either the class or 7592 // struct class-key shall be used to refer to a class (clause 9) 7593 // declared using the class or struct class-key. 7594 TagTypeKind OldTag = Previous->getTagKind(); 7595 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7596 if (OldTag == NewTag) 7597 return true; 7598 7599 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7600 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7601 // Warn about the struct/class tag mismatch. 7602 bool isTemplate = false; 7603 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7604 isTemplate = Record->getDescribedClassTemplate(); 7605 7606 if (!ActiveTemplateInstantiations.empty()) { 7607 // In a template instantiation, do not offer fix-its for tag mismatches 7608 // since they usually mess up the template instead of fixing the problem. 7609 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7610 << (NewTag == TTK_Class) << isTemplate << &Name; 7611 return true; 7612 } 7613 7614 if (isDefinition) { 7615 // On definitions, check previous tags and issue a fix-it for each 7616 // one that doesn't match the current tag. 7617 if (Previous->getDefinition()) { 7618 // Don't suggest fix-its for redefinitions. 7619 return true; 7620 } 7621 7622 bool previousMismatch = false; 7623 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7624 E(Previous->redecls_end()); I != E; ++I) { 7625 if (I->getTagKind() != NewTag) { 7626 if (!previousMismatch) { 7627 previousMismatch = true; 7628 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7629 << (NewTag == TTK_Class) << isTemplate << &Name; 7630 } 7631 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7632 << (NewTag == TTK_Class) 7633 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7634 NewTag == TTK_Class? 7635 "class" : "struct"); 7636 } 7637 } 7638 return true; 7639 } 7640 7641 // Check for a previous definition. If current tag and definition 7642 // are same type, do nothing. If no definition, but disagree with 7643 // with previous tag type, give a warning, but no fix-it. 7644 const TagDecl *Redecl = Previous->getDefinition() ? 7645 Previous->getDefinition() : Previous; 7646 if (Redecl->getTagKind() == NewTag) { 7647 return true; 7648 } 7649 7650 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7651 << (NewTag == TTK_Class) 7652 << isTemplate << &Name; 7653 Diag(Redecl->getLocation(), diag::note_previous_use); 7654 7655 // If there is a previous defintion, suggest a fix-it. 7656 if (Previous->getDefinition()) { 7657 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7658 << (Redecl->getTagKind() == TTK_Class) 7659 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7660 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7661 } 7662 7663 return true; 7664 } 7665 return false; 7666} 7667 7668/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7669/// former case, Name will be non-null. In the later case, Name will be null. 7670/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7671/// reference/declaration/definition of a tag. 7672Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7673 SourceLocation KWLoc, CXXScopeSpec &SS, 7674 IdentifierInfo *Name, SourceLocation NameLoc, 7675 AttributeList *Attr, AccessSpecifier AS, 7676 SourceLocation ModulePrivateLoc, 7677 MultiTemplateParamsArg TemplateParameterLists, 7678 bool &OwnedDecl, bool &IsDependent, 7679 SourceLocation ScopedEnumKWLoc, 7680 bool ScopedEnumUsesClassTag, 7681 TypeResult UnderlyingType) { 7682 // If this is not a definition, it must have a name. 7683 assert((Name != 0 || TUK == TUK_Definition) && 7684 "Nameless record must be a definition!"); 7685 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7686 7687 OwnedDecl = false; 7688 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7689 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 7690 7691 // FIXME: Check explicit specializations more carefully. 7692 bool isExplicitSpecialization = false; 7693 bool Invalid = false; 7694 7695 // We only need to do this matching if we have template parameters 7696 // or a scope specifier, which also conveniently avoids this work 7697 // for non-C++ cases. 7698 if (TemplateParameterLists.size() > 0 || 7699 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7700 if (TemplateParameterList *TemplateParams 7701 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7702 TemplateParameterLists.get(), 7703 TemplateParameterLists.size(), 7704 TUK == TUK_Friend, 7705 isExplicitSpecialization, 7706 Invalid)) { 7707 if (TemplateParams->size() > 0) { 7708 // This is a declaration or definition of a class template (which may 7709 // be a member of another template). 7710 7711 if (Invalid) 7712 return 0; 7713 7714 OwnedDecl = false; 7715 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7716 SS, Name, NameLoc, Attr, 7717 TemplateParams, AS, 7718 ModulePrivateLoc, 7719 TemplateParameterLists.size() - 1, 7720 (TemplateParameterList**) TemplateParameterLists.release()); 7721 return Result.get(); 7722 } else { 7723 // The "template<>" header is extraneous. 7724 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7725 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7726 isExplicitSpecialization = true; 7727 } 7728 } 7729 } 7730 7731 // Figure out the underlying type if this a enum declaration. We need to do 7732 // this early, because it's needed to detect if this is an incompatible 7733 // redeclaration. 7734 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7735 7736 if (Kind == TTK_Enum) { 7737 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7738 // No underlying type explicitly specified, or we failed to parse the 7739 // type, default to int. 7740 EnumUnderlying = Context.IntTy.getTypePtr(); 7741 else if (UnderlyingType.get()) { 7742 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7743 // integral type; any cv-qualification is ignored. 7744 TypeSourceInfo *TI = 0; 7745 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7746 EnumUnderlying = TI; 7747 7748 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7749 7750 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7751 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7752 << T; 7753 // Recover by falling back to int. 7754 EnumUnderlying = Context.IntTy.getTypePtr(); 7755 } 7756 7757 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7758 UPPC_FixedUnderlyingType)) 7759 EnumUnderlying = Context.IntTy.getTypePtr(); 7760 7761 } else if (getLangOptions().MicrosoftExt) 7762 // Microsoft enums are always of int type. 7763 EnumUnderlying = Context.IntTy.getTypePtr(); 7764 } 7765 7766 DeclContext *SearchDC = CurContext; 7767 DeclContext *DC = CurContext; 7768 bool isStdBadAlloc = false; 7769 7770 RedeclarationKind Redecl = ForRedeclaration; 7771 if (TUK == TUK_Friend || TUK == TUK_Reference) 7772 Redecl = NotForRedeclaration; 7773 7774 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7775 7776 if (Name && SS.isNotEmpty()) { 7777 // We have a nested-name tag ('struct foo::bar'). 7778 7779 // Check for invalid 'foo::'. 7780 if (SS.isInvalid()) { 7781 Name = 0; 7782 goto CreateNewDecl; 7783 } 7784 7785 // If this is a friend or a reference to a class in a dependent 7786 // context, don't try to make a decl for it. 7787 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7788 DC = computeDeclContext(SS, false); 7789 if (!DC) { 7790 IsDependent = true; 7791 return 0; 7792 } 7793 } else { 7794 DC = computeDeclContext(SS, true); 7795 if (!DC) { 7796 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7797 << SS.getRange(); 7798 return 0; 7799 } 7800 } 7801 7802 if (RequireCompleteDeclContext(SS, DC)) 7803 return 0; 7804 7805 SearchDC = DC; 7806 // Look-up name inside 'foo::'. 7807 LookupQualifiedName(Previous, DC); 7808 7809 if (Previous.isAmbiguous()) 7810 return 0; 7811 7812 if (Previous.empty()) { 7813 // Name lookup did not find anything. However, if the 7814 // nested-name-specifier refers to the current instantiation, 7815 // and that current instantiation has any dependent base 7816 // classes, we might find something at instantiation time: treat 7817 // this as a dependent elaborated-type-specifier. 7818 // But this only makes any sense for reference-like lookups. 7819 if (Previous.wasNotFoundInCurrentInstantiation() && 7820 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7821 IsDependent = true; 7822 return 0; 7823 } 7824 7825 // A tag 'foo::bar' must already exist. 7826 Diag(NameLoc, diag::err_not_tag_in_scope) 7827 << Kind << Name << DC << SS.getRange(); 7828 Name = 0; 7829 Invalid = true; 7830 goto CreateNewDecl; 7831 } 7832 } else if (Name) { 7833 // If this is a named struct, check to see if there was a previous forward 7834 // declaration or definition. 7835 // FIXME: We're looking into outer scopes here, even when we 7836 // shouldn't be. Doing so can result in ambiguities that we 7837 // shouldn't be diagnosing. 7838 LookupName(Previous, S); 7839 7840 if (Previous.isAmbiguous() && 7841 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7842 LookupResult::Filter F = Previous.makeFilter(); 7843 while (F.hasNext()) { 7844 NamedDecl *ND = F.next(); 7845 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7846 F.erase(); 7847 } 7848 F.done(); 7849 } 7850 7851 // Note: there used to be some attempt at recovery here. 7852 if (Previous.isAmbiguous()) 7853 return 0; 7854 7855 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7856 // FIXME: This makes sure that we ignore the contexts associated 7857 // with C structs, unions, and enums when looking for a matching 7858 // tag declaration or definition. See the similar lookup tweak 7859 // in Sema::LookupName; is there a better way to deal with this? 7860 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7861 SearchDC = SearchDC->getParent(); 7862 } 7863 } else if (S->isFunctionPrototypeScope()) { 7864 // If this is an enum declaration in function prototype scope, set its 7865 // initial context to the translation unit. 7866 SearchDC = Context.getTranslationUnitDecl(); 7867 } 7868 7869 if (Previous.isSingleResult() && 7870 Previous.getFoundDecl()->isTemplateParameter()) { 7871 // Maybe we will complain about the shadowed template parameter. 7872 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7873 // Just pretend that we didn't see the previous declaration. 7874 Previous.clear(); 7875 } 7876 7877 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7878 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7879 // This is a declaration of or a reference to "std::bad_alloc". 7880 isStdBadAlloc = true; 7881 7882 if (Previous.empty() && StdBadAlloc) { 7883 // std::bad_alloc has been implicitly declared (but made invisible to 7884 // name lookup). Fill in this implicit declaration as the previous 7885 // declaration, so that the declarations get chained appropriately. 7886 Previous.addDecl(getStdBadAlloc()); 7887 } 7888 } 7889 7890 // If we didn't find a previous declaration, and this is a reference 7891 // (or friend reference), move to the correct scope. In C++, we 7892 // also need to do a redeclaration lookup there, just in case 7893 // there's a shadow friend decl. 7894 if (Name && Previous.empty() && 7895 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7896 if (Invalid) goto CreateNewDecl; 7897 assert(SS.isEmpty()); 7898 7899 if (TUK == TUK_Reference) { 7900 // C++ [basic.scope.pdecl]p5: 7901 // -- for an elaborated-type-specifier of the form 7902 // 7903 // class-key identifier 7904 // 7905 // if the elaborated-type-specifier is used in the 7906 // decl-specifier-seq or parameter-declaration-clause of a 7907 // function defined in namespace scope, the identifier is 7908 // declared as a class-name in the namespace that contains 7909 // the declaration; otherwise, except as a friend 7910 // declaration, the identifier is declared in the smallest 7911 // non-class, non-function-prototype scope that contains the 7912 // declaration. 7913 // 7914 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7915 // C structs and unions. 7916 // 7917 // It is an error in C++ to declare (rather than define) an enum 7918 // type, including via an elaborated type specifier. We'll 7919 // diagnose that later; for now, declare the enum in the same 7920 // scope as we would have picked for any other tag type. 7921 // 7922 // GNU C also supports this behavior as part of its incomplete 7923 // enum types extension, while GNU C++ does not. 7924 // 7925 // Find the context where we'll be declaring the tag. 7926 // FIXME: We would like to maintain the current DeclContext as the 7927 // lexical context, 7928 while (SearchDC->isRecord() || SearchDC->isTransparentContext() || 7929 SearchDC->isObjCContainer()) 7930 SearchDC = SearchDC->getParent(); 7931 7932 // Find the scope where we'll be declaring the tag. 7933 while (S->isClassScope() || 7934 (getLangOptions().CPlusPlus && 7935 S->isFunctionPrototypeScope()) || 7936 ((S->getFlags() & Scope::DeclScope) == 0) || 7937 (S->getEntity() && 7938 ((DeclContext *)S->getEntity())->isTransparentContext())) 7939 S = S->getParent(); 7940 } else { 7941 assert(TUK == TUK_Friend); 7942 // C++ [namespace.memdef]p3: 7943 // If a friend declaration in a non-local class first declares a 7944 // class or function, the friend class or function is a member of 7945 // the innermost enclosing namespace. 7946 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7947 } 7948 7949 // In C++, we need to do a redeclaration lookup to properly 7950 // diagnose some problems. 7951 if (getLangOptions().CPlusPlus) { 7952 Previous.setRedeclarationKind(ForRedeclaration); 7953 LookupQualifiedName(Previous, SearchDC); 7954 } 7955 } 7956 7957 if (!Previous.empty()) { 7958 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7959 7960 // It's okay to have a tag decl in the same scope as a typedef 7961 // which hides a tag decl in the same scope. Finding this 7962 // insanity with a redeclaration lookup can only actually happen 7963 // in C++. 7964 // 7965 // This is also okay for elaborated-type-specifiers, which is 7966 // technically forbidden by the current standard but which is 7967 // okay according to the likely resolution of an open issue; 7968 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7969 if (getLangOptions().CPlusPlus) { 7970 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7971 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7972 TagDecl *Tag = TT->getDecl(); 7973 if (Tag->getDeclName() == Name && 7974 Tag->getDeclContext()->getRedeclContext() 7975 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7976 PrevDecl = Tag; 7977 Previous.clear(); 7978 Previous.addDecl(Tag); 7979 Previous.resolveKind(); 7980 } 7981 } 7982 } 7983 } 7984 7985 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7986 // If this is a use of a previous tag, or if the tag is already declared 7987 // in the same scope (so that the definition/declaration completes or 7988 // rementions the tag), reuse the decl. 7989 if (TUK == TUK_Reference || TUK == TUK_Friend || 7990 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7991 // Make sure that this wasn't declared as an enum and now used as a 7992 // struct or something similar. 7993 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7994 TUK == TUK_Definition, KWLoc, 7995 *Name)) { 7996 bool SafeToContinue 7997 = (PrevTagDecl->getTagKind() != TTK_Enum && 7998 Kind != TTK_Enum); 7999 if (SafeToContinue) 8000 Diag(KWLoc, diag::err_use_with_wrong_tag) 8001 << Name 8002 << FixItHint::CreateReplacement(SourceRange(KWLoc), 8003 PrevTagDecl->getKindName()); 8004 else 8005 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 8006 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8007 8008 if (SafeToContinue) 8009 Kind = PrevTagDecl->getTagKind(); 8010 else { 8011 // Recover by making this an anonymous redefinition. 8012 Name = 0; 8013 Previous.clear(); 8014 Invalid = true; 8015 } 8016 } 8017 8018 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 8019 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 8020 8021 // If this is an elaborated-type-specifier for a scoped enumeration, 8022 // the 'class' keyword is not necessary and not permitted. 8023 if (TUK == TUK_Reference || TUK == TUK_Friend) { 8024 if (ScopedEnum) 8025 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 8026 << PrevEnum->isScoped() 8027 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 8028 return PrevTagDecl; 8029 } 8030 8031 // All conflicts with previous declarations are recovered by 8032 // returning the previous declaration. 8033 if (ScopedEnum != PrevEnum->isScoped()) { 8034 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 8035 << PrevEnum->isScoped(); 8036 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8037 return PrevTagDecl; 8038 } 8039 else if (EnumUnderlying && PrevEnum->isFixed()) { 8040 QualType T; 8041 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8042 T = TI->getType(); 8043 else 8044 T = QualType(EnumUnderlying.get<const Type*>(), 0); 8045 8046 if (!Context.hasSameUnqualifiedType(T, 8047 PrevEnum->getIntegerType())) { 8048 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 8049 diag::err_enum_redeclare_type_mismatch) 8050 << T 8051 << PrevEnum->getIntegerType(); 8052 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8053 return PrevTagDecl; 8054 } 8055 } 8056 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 8057 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 8058 << PrevEnum->isFixed(); 8059 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8060 return PrevTagDecl; 8061 } 8062 } 8063 8064 if (!Invalid) { 8065 // If this is a use, just return the declaration we found. 8066 8067 // FIXME: In the future, return a variant or some other clue 8068 // for the consumer of this Decl to know it doesn't own it. 8069 // For our current ASTs this shouldn't be a problem, but will 8070 // need to be changed with DeclGroups. 8071 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 8072 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 8073 return PrevTagDecl; 8074 8075 // Diagnose attempts to redefine a tag. 8076 if (TUK == TUK_Definition) { 8077 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 8078 // If we're defining a specialization and the previous definition 8079 // is from an implicit instantiation, don't emit an error 8080 // here; we'll catch this in the general case below. 8081 if (!isExplicitSpecialization || 8082 !isa<CXXRecordDecl>(Def) || 8083 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 8084 == TSK_ExplicitSpecialization) { 8085 Diag(NameLoc, diag::err_redefinition) << Name; 8086 Diag(Def->getLocation(), diag::note_previous_definition); 8087 // If this is a redefinition, recover by making this 8088 // struct be anonymous, which will make any later 8089 // references get the previous definition. 8090 Name = 0; 8091 Previous.clear(); 8092 Invalid = true; 8093 } 8094 } else { 8095 // If the type is currently being defined, complain 8096 // about a nested redefinition. 8097 const TagType *Tag 8098 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8099 if (Tag->isBeingDefined()) { 8100 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8101 Diag(PrevTagDecl->getLocation(), 8102 diag::note_previous_definition); 8103 Name = 0; 8104 Previous.clear(); 8105 Invalid = true; 8106 } 8107 } 8108 8109 // Okay, this is definition of a previously declared or referenced 8110 // tag PrevDecl. We're going to create a new Decl for it. 8111 } 8112 } 8113 // If we get here we have (another) forward declaration or we 8114 // have a definition. Just create a new decl. 8115 8116 } else { 8117 // If we get here, this is a definition of a new tag type in a nested 8118 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8119 // new decl/type. We set PrevDecl to NULL so that the entities 8120 // have distinct types. 8121 Previous.clear(); 8122 } 8123 // If we get here, we're going to create a new Decl. If PrevDecl 8124 // is non-NULL, it's a definition of the tag declared by 8125 // PrevDecl. If it's NULL, we have a new definition. 8126 8127 8128 // Otherwise, PrevDecl is not a tag, but was found with tag 8129 // lookup. This is only actually possible in C++, where a few 8130 // things like templates still live in the tag namespace. 8131 } else { 8132 // Use a better diagnostic if an elaborated-type-specifier 8133 // found the wrong kind of type on the first 8134 // (non-redeclaration) lookup. 8135 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8136 !Previous.isForRedeclaration()) { 8137 unsigned Kind = 0; 8138 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8139 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8140 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8141 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8142 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8143 Invalid = true; 8144 8145 // Otherwise, only diagnose if the declaration is in scope. 8146 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8147 isExplicitSpecialization)) { 8148 // do nothing 8149 8150 // Diagnose implicit declarations introduced by elaborated types. 8151 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8152 unsigned Kind = 0; 8153 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8154 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8155 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8156 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8157 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8158 Invalid = true; 8159 8160 // Otherwise it's a declaration. Call out a particularly common 8161 // case here. 8162 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8163 unsigned Kind = 0; 8164 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8165 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8166 << Name << Kind << TND->getUnderlyingType(); 8167 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8168 Invalid = true; 8169 8170 // Otherwise, diagnose. 8171 } else { 8172 // The tag name clashes with something else in the target scope, 8173 // issue an error and recover by making this tag be anonymous. 8174 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8175 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8176 Name = 0; 8177 Invalid = true; 8178 } 8179 8180 // The existing declaration isn't relevant to us; we're in a 8181 // new scope, so clear out the previous declaration. 8182 Previous.clear(); 8183 } 8184 } 8185 8186CreateNewDecl: 8187 8188 TagDecl *PrevDecl = 0; 8189 if (Previous.isSingleResult()) 8190 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8191 8192 // If there is an identifier, use the location of the identifier as the 8193 // location of the decl, otherwise use the location of the struct/union 8194 // keyword. 8195 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8196 8197 // Otherwise, create a new declaration. If there is a previous 8198 // declaration of the same entity, the two will be linked via 8199 // PrevDecl. 8200 TagDecl *New; 8201 8202 bool IsForwardReference = false; 8203 if (Kind == TTK_Enum) { 8204 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8205 // enum X { A, B, C } D; D should chain to X. 8206 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8207 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8208 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8209 // If this is an undefined enum, warn. 8210 if (TUK != TUK_Definition && !Invalid) { 8211 TagDecl *Def; 8212 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8213 // C++0x: 7.2p2: opaque-enum-declaration. 8214 // Conflicts are diagnosed above. Do nothing. 8215 } 8216 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8217 Diag(Loc, diag::ext_forward_ref_enum_def) 8218 << New; 8219 Diag(Def->getLocation(), diag::note_previous_definition); 8220 } else { 8221 unsigned DiagID = diag::ext_forward_ref_enum; 8222 if (getLangOptions().MicrosoftExt) 8223 DiagID = diag::ext_ms_forward_ref_enum; 8224 else if (getLangOptions().CPlusPlus) 8225 DiagID = diag::err_forward_ref_enum; 8226 Diag(Loc, DiagID); 8227 8228 // If this is a forward-declared reference to an enumeration, make a 8229 // note of it; we won't actually be introducing the declaration into 8230 // the declaration context. 8231 if (TUK == TUK_Reference) 8232 IsForwardReference = true; 8233 } 8234 } 8235 8236 if (EnumUnderlying) { 8237 EnumDecl *ED = cast<EnumDecl>(New); 8238 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8239 ED->setIntegerTypeSourceInfo(TI); 8240 else 8241 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8242 ED->setPromotionType(ED->getIntegerType()); 8243 } 8244 8245 } else { 8246 // struct/union/class 8247 8248 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8249 // struct X { int A; } D; D should chain to X. 8250 if (getLangOptions().CPlusPlus) { 8251 // FIXME: Look for a way to use RecordDecl for simple structs. 8252 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8253 cast_or_null<CXXRecordDecl>(PrevDecl)); 8254 8255 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8256 StdBadAlloc = cast<CXXRecordDecl>(New); 8257 } else 8258 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8259 cast_or_null<RecordDecl>(PrevDecl)); 8260 } 8261 8262 // Maybe add qualifier info. 8263 if (SS.isNotEmpty()) { 8264 if (SS.isSet()) { 8265 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8266 if (TemplateParameterLists.size() > 0) { 8267 New->setTemplateParameterListsInfo(Context, 8268 TemplateParameterLists.size(), 8269 (TemplateParameterList**) TemplateParameterLists.release()); 8270 } 8271 } 8272 else 8273 Invalid = true; 8274 } 8275 8276 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8277 // Add alignment attributes if necessary; these attributes are checked when 8278 // the ASTContext lays out the structure. 8279 // 8280 // It is important for implementing the correct semantics that this 8281 // happen here (in act on tag decl). The #pragma pack stack is 8282 // maintained as a result of parser callbacks which can occur at 8283 // many points during the parsing of a struct declaration (because 8284 // the #pragma tokens are effectively skipped over during the 8285 // parsing of the struct). 8286 AddAlignmentAttributesForRecord(RD); 8287 8288 AddMsStructLayoutForRecord(RD); 8289 } 8290 8291 if (ModulePrivateLoc.isValid()) { 8292 if (isExplicitSpecialization) 8293 Diag(New->getLocation(), diag::err_module_private_specialization) 8294 << 2 8295 << FixItHint::CreateRemoval(ModulePrivateLoc); 8296 // __module_private__ does not apply to local classes. However, we only 8297 // diagnose this as an error when the declaration specifiers are 8298 // freestanding. Here, we just ignore the __module_private__. 8299 else if (!SearchDC->isFunctionOrMethod()) 8300 New->setModulePrivate(); 8301 } 8302 8303 // If this is a specialization of a member class (of a class template), 8304 // check the specialization. 8305 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8306 Invalid = true; 8307 8308 if (Invalid) 8309 New->setInvalidDecl(); 8310 8311 if (Attr) 8312 ProcessDeclAttributeList(S, New, Attr); 8313 8314 // If we're declaring or defining a tag in function prototype scope 8315 // in C, note that this type can only be used within the function. 8316 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8317 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8318 8319 // Set the lexical context. If the tag has a C++ scope specifier, the 8320 // lexical context will be different from the semantic context. 8321 New->setLexicalDeclContext(CurContext); 8322 8323 // Mark this as a friend decl if applicable. 8324 // In Microsoft mode, a friend declaration also acts as a forward 8325 // declaration so we always pass true to setObjectOfFriendDecl to make 8326 // the tag name visible. 8327 if (TUK == TUK_Friend) 8328 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8329 getLangOptions().MicrosoftExt); 8330 8331 // Set the access specifier. 8332 if (!Invalid && SearchDC->isRecord()) 8333 SetMemberAccessSpecifier(New, PrevDecl, AS); 8334 8335 if (TUK == TUK_Definition) 8336 New->startDefinition(); 8337 8338 // If this has an identifier, add it to the scope stack. 8339 if (TUK == TUK_Friend) { 8340 // We might be replacing an existing declaration in the lookup tables; 8341 // if so, borrow its access specifier. 8342 if (PrevDecl) 8343 New->setAccess(PrevDecl->getAccess()); 8344 8345 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8346 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8347 if (Name) // can be null along some error paths 8348 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8349 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8350 } else if (Name) { 8351 S = getNonFieldDeclScope(S); 8352 PushOnScopeChains(New, S, !IsForwardReference); 8353 if (IsForwardReference) 8354 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8355 8356 } else { 8357 CurContext->addDecl(New); 8358 } 8359 8360 // If this is the C FILE type, notify the AST context. 8361 if (IdentifierInfo *II = New->getIdentifier()) 8362 if (!New->isInvalidDecl() && 8363 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8364 II->isStr("FILE")) 8365 Context.setFILEDecl(New); 8366 8367 OwnedDecl = true; 8368 return New; 8369} 8370 8371void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8372 AdjustDeclIfTemplate(TagD); 8373 TagDecl *Tag = cast<TagDecl>(TagD); 8374 8375 // Enter the tag context. 8376 PushDeclContext(S, Tag); 8377} 8378 8379Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8380 assert(isa<ObjCContainerDecl>(IDecl) && 8381 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8382 DeclContext *OCD = cast<DeclContext>(IDecl); 8383 assert(getContainingDC(OCD) == CurContext && 8384 "The next DeclContext should be lexically contained in the current one."); 8385 CurContext = OCD; 8386 return IDecl; 8387} 8388 8389void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8390 SourceLocation FinalLoc, 8391 SourceLocation LBraceLoc) { 8392 AdjustDeclIfTemplate(TagD); 8393 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8394 8395 FieldCollector->StartClass(); 8396 8397 if (!Record->getIdentifier()) 8398 return; 8399 8400 if (FinalLoc.isValid()) 8401 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8402 8403 // C++ [class]p2: 8404 // [...] The class-name is also inserted into the scope of the 8405 // class itself; this is known as the injected-class-name. For 8406 // purposes of access checking, the injected-class-name is treated 8407 // as if it were a public member name. 8408 CXXRecordDecl *InjectedClassName 8409 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8410 Record->getLocStart(), Record->getLocation(), 8411 Record->getIdentifier(), 8412 /*PrevDecl=*/0, 8413 /*DelayTypeCreation=*/true); 8414 Context.getTypeDeclType(InjectedClassName, Record); 8415 InjectedClassName->setImplicit(); 8416 InjectedClassName->setAccess(AS_public); 8417 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8418 InjectedClassName->setDescribedClassTemplate(Template); 8419 PushOnScopeChains(InjectedClassName, S); 8420 assert(InjectedClassName->isInjectedClassName() && 8421 "Broken injected-class-name"); 8422} 8423 8424void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8425 SourceLocation RBraceLoc) { 8426 AdjustDeclIfTemplate(TagD); 8427 TagDecl *Tag = cast<TagDecl>(TagD); 8428 Tag->setRBraceLoc(RBraceLoc); 8429 8430 if (isa<CXXRecordDecl>(Tag)) 8431 FieldCollector->FinishClass(); 8432 8433 // Exit this scope of this tag's definition. 8434 PopDeclContext(); 8435 8436 // Notify the consumer that we've defined a tag. 8437 Consumer.HandleTagDeclDefinition(Tag); 8438} 8439 8440void Sema::ActOnObjCContainerFinishDefinition() { 8441 // Exit this scope of this interface definition. 8442 PopDeclContext(); 8443} 8444 8445void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8446 assert(DC == CurContext && "Mismatch of container contexts"); 8447 OriginalLexicalContext = DC; 8448 ActOnObjCContainerFinishDefinition(); 8449} 8450 8451void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8452 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8453 OriginalLexicalContext = 0; 8454} 8455 8456void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8457 AdjustDeclIfTemplate(TagD); 8458 TagDecl *Tag = cast<TagDecl>(TagD); 8459 Tag->setInvalidDecl(); 8460 8461 // We're undoing ActOnTagStartDefinition here, not 8462 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8463 // the FieldCollector. 8464 8465 PopDeclContext(); 8466} 8467 8468// Note that FieldName may be null for anonymous bitfields. 8469ExprResult Sema::VerifyBitField(SourceLocation FieldLoc, 8470 IdentifierInfo *FieldName, 8471 QualType FieldTy, Expr *BitWidth, 8472 bool *ZeroWidth) { 8473 // Default to true; that shouldn't confuse checks for emptiness 8474 if (ZeroWidth) 8475 *ZeroWidth = true; 8476 8477 // C99 6.7.2.1p4 - verify the field type. 8478 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8479 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8480 // Handle incomplete types with specific error. 8481 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8482 return ExprError(); 8483 if (FieldName) 8484 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8485 << FieldName << FieldTy << BitWidth->getSourceRange(); 8486 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8487 << FieldTy << BitWidth->getSourceRange(); 8488 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8489 UPPC_BitFieldWidth)) 8490 return ExprError(); 8491 8492 // If the bit-width is type- or value-dependent, don't try to check 8493 // it now. 8494 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8495 return Owned(BitWidth); 8496 8497 llvm::APSInt Value; 8498 ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value); 8499 if (ICE.isInvalid()) 8500 return ICE; 8501 BitWidth = ICE.take(); 8502 8503 if (Value != 0 && ZeroWidth) 8504 *ZeroWidth = false; 8505 8506 // Zero-width bitfield is ok for anonymous field. 8507 if (Value == 0 && FieldName) 8508 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8509 8510 if (Value.isSigned() && Value.isNegative()) { 8511 if (FieldName) 8512 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8513 << FieldName << Value.toString(10); 8514 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8515 << Value.toString(10); 8516 } 8517 8518 if (!FieldTy->isDependentType()) { 8519 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8520 if (Value.getZExtValue() > TypeSize) { 8521 if (!getLangOptions().CPlusPlus) { 8522 if (FieldName) 8523 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8524 << FieldName << (unsigned)Value.getZExtValue() 8525 << (unsigned)TypeSize; 8526 8527 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8528 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8529 } 8530 8531 if (FieldName) 8532 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8533 << FieldName << (unsigned)Value.getZExtValue() 8534 << (unsigned)TypeSize; 8535 else 8536 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8537 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8538 } 8539 } 8540 8541 return Owned(BitWidth); 8542} 8543 8544/// ActOnField - Each field of a C struct/union is passed into this in order 8545/// to create a FieldDecl object for it. 8546Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8547 Declarator &D, Expr *BitfieldWidth) { 8548 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8549 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8550 /*HasInit=*/false, AS_public); 8551 return Res; 8552} 8553 8554/// HandleField - Analyze a field of a C struct or a C++ data member. 8555/// 8556FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8557 SourceLocation DeclStart, 8558 Declarator &D, Expr *BitWidth, bool HasInit, 8559 AccessSpecifier AS) { 8560 IdentifierInfo *II = D.getIdentifier(); 8561 SourceLocation Loc = DeclStart; 8562 if (II) Loc = D.getIdentifierLoc(); 8563 8564 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8565 QualType T = TInfo->getType(); 8566 if (getLangOptions().CPlusPlus) { 8567 CheckExtraCXXDefaultArguments(D); 8568 8569 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8570 UPPC_DataMemberType)) { 8571 D.setInvalidType(); 8572 T = Context.IntTy; 8573 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8574 } 8575 } 8576 8577 DiagnoseFunctionSpecifiers(D); 8578 8579 if (D.getDeclSpec().isThreadSpecified()) 8580 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8581 if (D.getDeclSpec().isConstexprSpecified()) 8582 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8583 << 2; 8584 8585 // Check to see if this name was declared as a member previously 8586 NamedDecl *PrevDecl = 0; 8587 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8588 LookupName(Previous, S); 8589 switch (Previous.getResultKind()) { 8590 case LookupResult::Found: 8591 case LookupResult::FoundUnresolvedValue: 8592 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8593 break; 8594 8595 case LookupResult::FoundOverloaded: 8596 PrevDecl = Previous.getRepresentativeDecl(); 8597 break; 8598 8599 case LookupResult::NotFound: 8600 case LookupResult::NotFoundInCurrentInstantiation: 8601 case LookupResult::Ambiguous: 8602 break; 8603 } 8604 Previous.suppressDiagnostics(); 8605 8606 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8607 // Maybe we will complain about the shadowed template parameter. 8608 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8609 // Just pretend that we didn't see the previous declaration. 8610 PrevDecl = 0; 8611 } 8612 8613 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8614 PrevDecl = 0; 8615 8616 bool Mutable 8617 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8618 SourceLocation TSSL = D.getSourceRange().getBegin(); 8619 FieldDecl *NewFD 8620 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8621 TSSL, AS, PrevDecl, &D); 8622 8623 if (NewFD->isInvalidDecl()) 8624 Record->setInvalidDecl(); 8625 8626 if (D.getDeclSpec().isModulePrivateSpecified()) 8627 NewFD->setModulePrivate(); 8628 8629 if (NewFD->isInvalidDecl() && PrevDecl) { 8630 // Don't introduce NewFD into scope; there's already something 8631 // with the same name in the same scope. 8632 } else if (II) { 8633 PushOnScopeChains(NewFD, S); 8634 } else 8635 Record->addDecl(NewFD); 8636 8637 return NewFD; 8638} 8639 8640/// \brief Build a new FieldDecl and check its well-formedness. 8641/// 8642/// This routine builds a new FieldDecl given the fields name, type, 8643/// record, etc. \p PrevDecl should refer to any previous declaration 8644/// with the same name and in the same scope as the field to be 8645/// created. 8646/// 8647/// \returns a new FieldDecl. 8648/// 8649/// \todo The Declarator argument is a hack. It will be removed once 8650FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8651 TypeSourceInfo *TInfo, 8652 RecordDecl *Record, SourceLocation Loc, 8653 bool Mutable, Expr *BitWidth, bool HasInit, 8654 SourceLocation TSSL, 8655 AccessSpecifier AS, NamedDecl *PrevDecl, 8656 Declarator *D) { 8657 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8658 bool InvalidDecl = false; 8659 if (D) InvalidDecl = D->isInvalidType(); 8660 8661 // If we receive a broken type, recover by assuming 'int' and 8662 // marking this declaration as invalid. 8663 if (T.isNull()) { 8664 InvalidDecl = true; 8665 T = Context.IntTy; 8666 } 8667 8668 QualType EltTy = Context.getBaseElementType(T); 8669 if (!EltTy->isDependentType() && 8670 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8671 // Fields of incomplete type force their record to be invalid. 8672 Record->setInvalidDecl(); 8673 InvalidDecl = true; 8674 } 8675 8676 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8677 // than a variably modified type. 8678 if (!InvalidDecl && T->isVariablyModifiedType()) { 8679 bool SizeIsNegative; 8680 llvm::APSInt Oversized; 8681 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8682 SizeIsNegative, 8683 Oversized); 8684 if (!FixedTy.isNull()) { 8685 Diag(Loc, diag::warn_illegal_constant_array_size); 8686 T = FixedTy; 8687 } else { 8688 if (SizeIsNegative) 8689 Diag(Loc, diag::err_typecheck_negative_array_size); 8690 else if (Oversized.getBoolValue()) 8691 Diag(Loc, diag::err_array_too_large) 8692 << Oversized.toString(10); 8693 else 8694 Diag(Loc, diag::err_typecheck_field_variable_size); 8695 InvalidDecl = true; 8696 } 8697 } 8698 8699 // Fields can not have abstract class types 8700 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8701 diag::err_abstract_type_in_decl, 8702 AbstractFieldType)) 8703 InvalidDecl = true; 8704 8705 bool ZeroWidth = false; 8706 // If this is declared as a bit-field, check the bit-field. 8707 if (!InvalidDecl && BitWidth) { 8708 BitWidth = VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth).take(); 8709 if (!BitWidth) { 8710 InvalidDecl = true; 8711 BitWidth = 0; 8712 ZeroWidth = false; 8713 } 8714 } 8715 8716 // Check that 'mutable' is consistent with the type of the declaration. 8717 if (!InvalidDecl && Mutable) { 8718 unsigned DiagID = 0; 8719 if (T->isReferenceType()) 8720 DiagID = diag::err_mutable_reference; 8721 else if (T.isConstQualified()) 8722 DiagID = diag::err_mutable_const; 8723 8724 if (DiagID) { 8725 SourceLocation ErrLoc = Loc; 8726 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8727 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8728 Diag(ErrLoc, DiagID); 8729 Mutable = false; 8730 InvalidDecl = true; 8731 } 8732 } 8733 8734 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8735 BitWidth, Mutable, HasInit); 8736 if (InvalidDecl) 8737 NewFD->setInvalidDecl(); 8738 8739 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8740 Diag(Loc, diag::err_duplicate_member) << II; 8741 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8742 NewFD->setInvalidDecl(); 8743 } 8744 8745 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8746 if (Record->isUnion()) { 8747 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8748 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8749 if (RDecl->getDefinition()) { 8750 // C++ [class.union]p1: An object of a class with a non-trivial 8751 // constructor, a non-trivial copy constructor, a non-trivial 8752 // destructor, or a non-trivial copy assignment operator 8753 // cannot be a member of a union, nor can an array of such 8754 // objects. 8755 if (CheckNontrivialField(NewFD)) 8756 NewFD->setInvalidDecl(); 8757 } 8758 } 8759 8760 // C++ [class.union]p1: If a union contains a member of reference type, 8761 // the program is ill-formed. 8762 if (EltTy->isReferenceType()) { 8763 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8764 << NewFD->getDeclName() << EltTy; 8765 NewFD->setInvalidDecl(); 8766 } 8767 } 8768 } 8769 8770 // FIXME: We need to pass in the attributes given an AST 8771 // representation, not a parser representation. 8772 if (D) 8773 // FIXME: What to pass instead of TUScope? 8774 ProcessDeclAttributes(TUScope, NewFD, *D); 8775 8776 // In auto-retain/release, infer strong retension for fields of 8777 // retainable type. 8778 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8779 NewFD->setInvalidDecl(); 8780 8781 if (T.isObjCGCWeak()) 8782 Diag(Loc, diag::warn_attribute_weak_on_field); 8783 8784 NewFD->setAccess(AS); 8785 return NewFD; 8786} 8787 8788bool Sema::CheckNontrivialField(FieldDecl *FD) { 8789 assert(FD); 8790 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8791 8792 if (FD->isInvalidDecl()) 8793 return true; 8794 8795 QualType EltTy = Context.getBaseElementType(FD->getType()); 8796 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8797 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8798 if (RDecl->getDefinition()) { 8799 // We check for copy constructors before constructors 8800 // because otherwise we'll never get complaints about 8801 // copy constructors. 8802 8803 CXXSpecialMember member = CXXInvalid; 8804 if (!RDecl->hasTrivialCopyConstructor()) 8805 member = CXXCopyConstructor; 8806 else if (!RDecl->hasTrivialDefaultConstructor()) 8807 member = CXXDefaultConstructor; 8808 else if (!RDecl->hasTrivialCopyAssignment()) 8809 member = CXXCopyAssignment; 8810 else if (!RDecl->hasTrivialDestructor()) 8811 member = CXXDestructor; 8812 8813 if (member != CXXInvalid) { 8814 if (!getLangOptions().CPlusPlus0x && 8815 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8816 // Objective-C++ ARC: it is an error to have a non-trivial field of 8817 // a union. However, system headers in Objective-C programs 8818 // occasionally have Objective-C lifetime objects within unions, 8819 // and rather than cause the program to fail, we make those 8820 // members unavailable. 8821 SourceLocation Loc = FD->getLocation(); 8822 if (getSourceManager().isInSystemHeader(Loc)) { 8823 if (!FD->hasAttr<UnavailableAttr>()) 8824 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8825 "this system field has retaining ownership")); 8826 return false; 8827 } 8828 } 8829 8830 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8831 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8832 diag::err_illegal_union_or_anon_struct_member) 8833 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8834 DiagnoseNontrivial(RT, member); 8835 return !getLangOptions().CPlusPlus0x; 8836 } 8837 } 8838 } 8839 8840 return false; 8841} 8842 8843/// DiagnoseNontrivial - Given that a class has a non-trivial 8844/// special member, figure out why. 8845void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8846 QualType QT(T, 0U); 8847 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8848 8849 // Check whether the member was user-declared. 8850 switch (member) { 8851 case CXXInvalid: 8852 break; 8853 8854 case CXXDefaultConstructor: 8855 if (RD->hasUserDeclaredConstructor()) { 8856 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8857 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8858 const FunctionDecl *body = 0; 8859 ci->hasBody(body); 8860 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8861 SourceLocation CtorLoc = ci->getLocation(); 8862 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8863 return; 8864 } 8865 } 8866 8867 llvm_unreachable("found no user-declared constructors"); 8868 } 8869 break; 8870 8871 case CXXCopyConstructor: 8872 if (RD->hasUserDeclaredCopyConstructor()) { 8873 SourceLocation CtorLoc = 8874 RD->getCopyConstructor(0)->getLocation(); 8875 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8876 return; 8877 } 8878 break; 8879 8880 case CXXMoveConstructor: 8881 if (RD->hasUserDeclaredMoveConstructor()) { 8882 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8883 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8884 return; 8885 } 8886 break; 8887 8888 case CXXCopyAssignment: 8889 if (RD->hasUserDeclaredCopyAssignment()) { 8890 // FIXME: this should use the location of the copy 8891 // assignment, not the type. 8892 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8893 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8894 return; 8895 } 8896 break; 8897 8898 case CXXMoveAssignment: 8899 if (RD->hasUserDeclaredMoveAssignment()) { 8900 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8901 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8902 return; 8903 } 8904 break; 8905 8906 case CXXDestructor: 8907 if (RD->hasUserDeclaredDestructor()) { 8908 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8909 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8910 return; 8911 } 8912 break; 8913 } 8914 8915 typedef CXXRecordDecl::base_class_iterator base_iter; 8916 8917 // Virtual bases and members inhibit trivial copying/construction, 8918 // but not trivial destruction. 8919 if (member != CXXDestructor) { 8920 // Check for virtual bases. vbases includes indirect virtual bases, 8921 // so we just iterate through the direct bases. 8922 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8923 if (bi->isVirtual()) { 8924 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8925 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8926 return; 8927 } 8928 8929 // Check for virtual methods. 8930 typedef CXXRecordDecl::method_iterator meth_iter; 8931 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8932 ++mi) { 8933 if (mi->isVirtual()) { 8934 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8935 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8936 return; 8937 } 8938 } 8939 } 8940 8941 bool (CXXRecordDecl::*hasTrivial)() const; 8942 switch (member) { 8943 case CXXDefaultConstructor: 8944 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8945 case CXXCopyConstructor: 8946 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8947 case CXXCopyAssignment: 8948 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8949 case CXXDestructor: 8950 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8951 default: 8952 llvm_unreachable("unexpected special member"); 8953 } 8954 8955 // Check for nontrivial bases (and recurse). 8956 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8957 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8958 assert(BaseRT && "Don't know how to handle dependent bases"); 8959 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8960 if (!(BaseRecTy->*hasTrivial)()) { 8961 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8962 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8963 DiagnoseNontrivial(BaseRT, member); 8964 return; 8965 } 8966 } 8967 8968 // Check for nontrivial members (and recurse). 8969 typedef RecordDecl::field_iterator field_iter; 8970 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8971 ++fi) { 8972 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8973 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8974 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8975 8976 if (!(EltRD->*hasTrivial)()) { 8977 SourceLocation FLoc = (*fi)->getLocation(); 8978 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8979 DiagnoseNontrivial(EltRT, member); 8980 return; 8981 } 8982 } 8983 8984 if (EltTy->isObjCLifetimeType()) { 8985 switch (EltTy.getObjCLifetime()) { 8986 case Qualifiers::OCL_None: 8987 case Qualifiers::OCL_ExplicitNone: 8988 break; 8989 8990 case Qualifiers::OCL_Autoreleasing: 8991 case Qualifiers::OCL_Weak: 8992 case Qualifiers::OCL_Strong: 8993 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8994 << QT << EltTy.getObjCLifetime(); 8995 return; 8996 } 8997 } 8998 } 8999 9000 llvm_unreachable("found no explanation for non-trivial member"); 9001} 9002 9003/// TranslateIvarVisibility - Translate visibility from a token ID to an 9004/// AST enum value. 9005static ObjCIvarDecl::AccessControl 9006TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 9007 switch (ivarVisibility) { 9008 default: llvm_unreachable("Unknown visitibility kind"); 9009 case tok::objc_private: return ObjCIvarDecl::Private; 9010 case tok::objc_public: return ObjCIvarDecl::Public; 9011 case tok::objc_protected: return ObjCIvarDecl::Protected; 9012 case tok::objc_package: return ObjCIvarDecl::Package; 9013 } 9014} 9015 9016/// ActOnIvar - Each ivar field of an objective-c class is passed into this 9017/// in order to create an IvarDecl object for it. 9018Decl *Sema::ActOnIvar(Scope *S, 9019 SourceLocation DeclStart, 9020 Declarator &D, Expr *BitfieldWidth, 9021 tok::ObjCKeywordKind Visibility) { 9022 9023 IdentifierInfo *II = D.getIdentifier(); 9024 Expr *BitWidth = (Expr*)BitfieldWidth; 9025 SourceLocation Loc = DeclStart; 9026 if (II) Loc = D.getIdentifierLoc(); 9027 9028 // FIXME: Unnamed fields can be handled in various different ways, for 9029 // example, unnamed unions inject all members into the struct namespace! 9030 9031 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9032 QualType T = TInfo->getType(); 9033 9034 if (BitWidth) { 9035 // 6.7.2.1p3, 6.7.2.1p4 9036 BitWidth = VerifyBitField(Loc, II, T, BitWidth).take(); 9037 if (!BitWidth) 9038 D.setInvalidType(); 9039 } else { 9040 // Not a bitfield. 9041 9042 // validate II. 9043 9044 } 9045 if (T->isReferenceType()) { 9046 Diag(Loc, diag::err_ivar_reference_type); 9047 D.setInvalidType(); 9048 } 9049 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9050 // than a variably modified type. 9051 else if (T->isVariablyModifiedType()) { 9052 Diag(Loc, diag::err_typecheck_ivar_variable_size); 9053 D.setInvalidType(); 9054 } 9055 9056 // Get the visibility (access control) for this ivar. 9057 ObjCIvarDecl::AccessControl ac = 9058 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 9059 : ObjCIvarDecl::None; 9060 // Must set ivar's DeclContext to its enclosing interface. 9061 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 9062 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl()) 9063 return 0; 9064 ObjCContainerDecl *EnclosingContext; 9065 if (ObjCImplementationDecl *IMPDecl = 9066 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9067 if (!LangOpts.ObjCNonFragileABI2) { 9068 // Case of ivar declared in an implementation. Context is that of its class. 9069 EnclosingContext = IMPDecl->getClassInterface(); 9070 assert(EnclosingContext && "Implementation has no class interface!"); 9071 } 9072 else 9073 EnclosingContext = EnclosingDecl; 9074 } else { 9075 if (ObjCCategoryDecl *CDecl = 9076 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9077 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 9078 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 9079 return 0; 9080 } 9081 } 9082 EnclosingContext = EnclosingDecl; 9083 } 9084 9085 // Construct the decl. 9086 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 9087 DeclStart, Loc, II, T, 9088 TInfo, ac, (Expr *)BitfieldWidth); 9089 9090 if (II) { 9091 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 9092 ForRedeclaration); 9093 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9094 && !isa<TagDecl>(PrevDecl)) { 9095 Diag(Loc, diag::err_duplicate_member) << II; 9096 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9097 NewID->setInvalidDecl(); 9098 } 9099 } 9100 9101 // Process attributes attached to the ivar. 9102 ProcessDeclAttributes(S, NewID, D); 9103 9104 if (D.isInvalidType()) 9105 NewID->setInvalidDecl(); 9106 9107 // In ARC, infer 'retaining' for ivars of retainable type. 9108 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9109 NewID->setInvalidDecl(); 9110 9111 if (D.getDeclSpec().isModulePrivateSpecified()) 9112 NewID->setModulePrivate(); 9113 9114 if (II) { 9115 // FIXME: When interfaces are DeclContexts, we'll need to add 9116 // these to the interface. 9117 S->AddDecl(NewID); 9118 IdResolver.AddDecl(NewID); 9119 } 9120 9121 return NewID; 9122} 9123 9124/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9125/// class and class extensions. For every class @interface and class 9126/// extension @interface, if the last ivar is a bitfield of any type, 9127/// then add an implicit `char :0` ivar to the end of that interface. 9128void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9129 SmallVectorImpl<Decl *> &AllIvarDecls) { 9130 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9131 return; 9132 9133 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9134 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9135 9136 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9137 return; 9138 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9139 if (!ID) { 9140 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9141 if (!CD->IsClassExtension()) 9142 return; 9143 } 9144 // No need to add this to end of @implementation. 9145 else 9146 return; 9147 } 9148 // All conditions are met. Add a new bitfield to the tail end of ivars. 9149 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9150 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9151 9152 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9153 DeclLoc, DeclLoc, 0, 9154 Context.CharTy, 9155 Context.getTrivialTypeSourceInfo(Context.CharTy, 9156 DeclLoc), 9157 ObjCIvarDecl::Private, BW, 9158 true); 9159 AllIvarDecls.push_back(Ivar); 9160} 9161 9162void Sema::ActOnFields(Scope* S, 9163 SourceLocation RecLoc, Decl *EnclosingDecl, 9164 llvm::ArrayRef<Decl *> Fields, 9165 SourceLocation LBrac, SourceLocation RBrac, 9166 AttributeList *Attr) { 9167 assert(EnclosingDecl && "missing record or interface decl"); 9168 9169 // If the decl this is being inserted into is invalid, then it may be a 9170 // redeclaration or some other bogus case. Don't try to add fields to it. 9171 if (EnclosingDecl->isInvalidDecl()) 9172 return; 9173 9174 // Verify that all the fields are okay. 9175 unsigned NumNamedMembers = 0; 9176 SmallVector<FieldDecl*, 32> RecFields; 9177 9178 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9179 bool ARCErrReported = false; 9180 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9181 i != end; ++i) { 9182 FieldDecl *FD = cast<FieldDecl>(*i); 9183 9184 // Get the type for the field. 9185 const Type *FDTy = FD->getType().getTypePtr(); 9186 9187 if (!FD->isAnonymousStructOrUnion()) { 9188 // Remember all fields written by the user. 9189 RecFields.push_back(FD); 9190 } 9191 9192 // If the field is already invalid for some reason, don't emit more 9193 // diagnostics about it. 9194 if (FD->isInvalidDecl()) { 9195 EnclosingDecl->setInvalidDecl(); 9196 continue; 9197 } 9198 9199 // C99 6.7.2.1p2: 9200 // A structure or union shall not contain a member with 9201 // incomplete or function type (hence, a structure shall not 9202 // contain an instance of itself, but may contain a pointer to 9203 // an instance of itself), except that the last member of a 9204 // structure with more than one named member may have incomplete 9205 // array type; such a structure (and any union containing, 9206 // possibly recursively, a member that is such a structure) 9207 // shall not be a member of a structure or an element of an 9208 // array. 9209 if (FDTy->isFunctionType()) { 9210 // Field declared as a function. 9211 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9212 << FD->getDeclName(); 9213 FD->setInvalidDecl(); 9214 EnclosingDecl->setInvalidDecl(); 9215 continue; 9216 } else if (FDTy->isIncompleteArrayType() && Record && 9217 ((i + 1 == Fields.end() && !Record->isUnion()) || 9218 ((getLangOptions().MicrosoftExt || 9219 getLangOptions().CPlusPlus) && 9220 (i + 1 == Fields.end() || Record->isUnion())))) { 9221 // Flexible array member. 9222 // Microsoft and g++ is more permissive regarding flexible array. 9223 // It will accept flexible array in union and also 9224 // as the sole element of a struct/class. 9225 if (getLangOptions().MicrosoftExt) { 9226 if (Record->isUnion()) 9227 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9228 << FD->getDeclName(); 9229 else if (Fields.size() == 1) 9230 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9231 << FD->getDeclName() << Record->getTagKind(); 9232 } else if (getLangOptions().CPlusPlus) { 9233 if (Record->isUnion()) 9234 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9235 << FD->getDeclName(); 9236 else if (Fields.size() == 1) 9237 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9238 << FD->getDeclName() << Record->getTagKind(); 9239 } else if (NumNamedMembers < 1) { 9240 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9241 << FD->getDeclName(); 9242 FD->setInvalidDecl(); 9243 EnclosingDecl->setInvalidDecl(); 9244 continue; 9245 } 9246 if (!FD->getType()->isDependentType() && 9247 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9248 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9249 << FD->getDeclName() << FD->getType(); 9250 FD->setInvalidDecl(); 9251 EnclosingDecl->setInvalidDecl(); 9252 continue; 9253 } 9254 // Okay, we have a legal flexible array member at the end of the struct. 9255 if (Record) 9256 Record->setHasFlexibleArrayMember(true); 9257 } else if (!FDTy->isDependentType() && 9258 RequireCompleteType(FD->getLocation(), FD->getType(), 9259 diag::err_field_incomplete)) { 9260 // Incomplete type 9261 FD->setInvalidDecl(); 9262 EnclosingDecl->setInvalidDecl(); 9263 continue; 9264 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9265 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9266 // If this is a member of a union, then entire union becomes "flexible". 9267 if (Record && Record->isUnion()) { 9268 Record->setHasFlexibleArrayMember(true); 9269 } else { 9270 // If this is a struct/class and this is not the last element, reject 9271 // it. Note that GCC supports variable sized arrays in the middle of 9272 // structures. 9273 if (i + 1 != Fields.end()) 9274 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9275 << FD->getDeclName() << FD->getType(); 9276 else { 9277 // We support flexible arrays at the end of structs in 9278 // other structs as an extension. 9279 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9280 << FD->getDeclName(); 9281 if (Record) 9282 Record->setHasFlexibleArrayMember(true); 9283 } 9284 } 9285 } 9286 if (Record && FDTTy->getDecl()->hasObjectMember()) 9287 Record->setHasObjectMember(true); 9288 } else if (FDTy->isObjCObjectType()) { 9289 /// A field cannot be an Objective-c object 9290 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9291 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9292 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9293 FD->setType(T); 9294 } 9295 else if (!getLangOptions().CPlusPlus) { 9296 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9297 // It's an error in ARC if a field has lifetime. 9298 // We don't want to report this in a system header, though, 9299 // so we just make the field unavailable. 9300 // FIXME: that's really not sufficient; we need to make the type 9301 // itself invalid to, say, initialize or copy. 9302 QualType T = FD->getType(); 9303 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9304 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9305 SourceLocation loc = FD->getLocation(); 9306 if (getSourceManager().isInSystemHeader(loc)) { 9307 if (!FD->hasAttr<UnavailableAttr>()) { 9308 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9309 "this system field has retaining ownership")); 9310 } 9311 } else { 9312 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9313 << T->isBlockPointerType(); 9314 } 9315 ARCErrReported = true; 9316 } 9317 } 9318 else if (getLangOptions().ObjC1 && 9319 getLangOptions().getGC() != LangOptions::NonGC && 9320 Record && !Record->hasObjectMember()) { 9321 if (FD->getType()->isObjCObjectPointerType() || 9322 FD->getType().isObjCGCStrong()) 9323 Record->setHasObjectMember(true); 9324 else if (Context.getAsArrayType(FD->getType())) { 9325 QualType BaseType = Context.getBaseElementType(FD->getType()); 9326 if (BaseType->isRecordType() && 9327 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9328 Record->setHasObjectMember(true); 9329 else if (BaseType->isObjCObjectPointerType() || 9330 BaseType.isObjCGCStrong()) 9331 Record->setHasObjectMember(true); 9332 } 9333 } 9334 } 9335 // Keep track of the number of named members. 9336 if (FD->getIdentifier()) 9337 ++NumNamedMembers; 9338 } 9339 9340 // Okay, we successfully defined 'Record'. 9341 if (Record) { 9342 bool Completed = false; 9343 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9344 if (!CXXRecord->isInvalidDecl()) { 9345 // Set access bits correctly on the directly-declared conversions. 9346 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9347 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9348 I != E; ++I) 9349 Convs->setAccess(I, (*I)->getAccess()); 9350 9351 if (!CXXRecord->isDependentType()) { 9352 // Objective-C Automatic Reference Counting: 9353 // If a class has a non-static data member of Objective-C pointer 9354 // type (or array thereof), it is a non-POD type and its 9355 // default constructor (if any), copy constructor, copy assignment 9356 // operator, and destructor are non-trivial. 9357 // 9358 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9359 // However, here we check whether this particular class is only 9360 // non-POD because of the presence of an Objective-C pointer member. 9361 // If so, objects of this type cannot be shared between code compiled 9362 // with instant objects and code compiled with manual retain/release. 9363 if (getLangOptions().ObjCAutoRefCount && 9364 CXXRecord->hasObjectMember() && 9365 CXXRecord->getLinkage() == ExternalLinkage) { 9366 if (CXXRecord->isPOD()) { 9367 Diag(CXXRecord->getLocation(), 9368 diag::warn_arc_non_pod_class_with_object_member) 9369 << CXXRecord; 9370 } else { 9371 // FIXME: Fix-Its would be nice here, but finding a good location 9372 // for them is going to be tricky. 9373 if (CXXRecord->hasTrivialCopyConstructor()) 9374 Diag(CXXRecord->getLocation(), 9375 diag::warn_arc_trivial_member_function_with_object_member) 9376 << CXXRecord << 0; 9377 if (CXXRecord->hasTrivialCopyAssignment()) 9378 Diag(CXXRecord->getLocation(), 9379 diag::warn_arc_trivial_member_function_with_object_member) 9380 << CXXRecord << 1; 9381 if (CXXRecord->hasTrivialDestructor()) 9382 Diag(CXXRecord->getLocation(), 9383 diag::warn_arc_trivial_member_function_with_object_member) 9384 << CXXRecord << 2; 9385 } 9386 } 9387 9388 // Adjust user-defined destructor exception spec. 9389 if (getLangOptions().CPlusPlus0x && 9390 CXXRecord->hasUserDeclaredDestructor()) 9391 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9392 9393 // Add any implicitly-declared members to this class. 9394 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9395 9396 // If we have virtual base classes, we may end up finding multiple 9397 // final overriders for a given virtual function. Check for this 9398 // problem now. 9399 if (CXXRecord->getNumVBases()) { 9400 CXXFinalOverriderMap FinalOverriders; 9401 CXXRecord->getFinalOverriders(FinalOverriders); 9402 9403 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9404 MEnd = FinalOverriders.end(); 9405 M != MEnd; ++M) { 9406 for (OverridingMethods::iterator SO = M->second.begin(), 9407 SOEnd = M->second.end(); 9408 SO != SOEnd; ++SO) { 9409 assert(SO->second.size() > 0 && 9410 "Virtual function without overridding functions?"); 9411 if (SO->second.size() == 1) 9412 continue; 9413 9414 // C++ [class.virtual]p2: 9415 // In a derived class, if a virtual member function of a base 9416 // class subobject has more than one final overrider the 9417 // program is ill-formed. 9418 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9419 << (NamedDecl *)M->first << Record; 9420 Diag(M->first->getLocation(), 9421 diag::note_overridden_virtual_function); 9422 for (OverridingMethods::overriding_iterator 9423 OM = SO->second.begin(), 9424 OMEnd = SO->second.end(); 9425 OM != OMEnd; ++OM) 9426 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9427 << (NamedDecl *)M->first << OM->Method->getParent(); 9428 9429 Record->setInvalidDecl(); 9430 } 9431 } 9432 CXXRecord->completeDefinition(&FinalOverriders); 9433 Completed = true; 9434 } 9435 } 9436 } 9437 } 9438 9439 if (!Completed) 9440 Record->completeDefinition(); 9441 9442 // Now that the record is complete, do any delayed exception spec checks 9443 // we were missing. 9444 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9445 const CXXDestructorDecl *Dtor = 9446 DelayedDestructorExceptionSpecChecks.back().first; 9447 if (Dtor->getParent() != Record) 9448 break; 9449 9450 assert(!Dtor->getParent()->isDependentType() && 9451 "Should not ever add destructors of templates into the list."); 9452 CheckOverridingFunctionExceptionSpec(Dtor, 9453 DelayedDestructorExceptionSpecChecks.back().second); 9454 DelayedDestructorExceptionSpecChecks.pop_back(); 9455 } 9456 9457 } else { 9458 ObjCIvarDecl **ClsFields = 9459 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9460 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9461 ID->setEndOfDefinitionLoc(RBrac); 9462 // Add ivar's to class's DeclContext. 9463 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9464 ClsFields[i]->setLexicalDeclContext(ID); 9465 ID->addDecl(ClsFields[i]); 9466 } 9467 // Must enforce the rule that ivars in the base classes may not be 9468 // duplicates. 9469 if (ID->getSuperClass()) 9470 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9471 } else if (ObjCImplementationDecl *IMPDecl = 9472 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9473 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9474 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9475 // Ivar declared in @implementation never belongs to the implementation. 9476 // Only it is in implementation's lexical context. 9477 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9478 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9479 } else if (ObjCCategoryDecl *CDecl = 9480 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9481 // case of ivars in class extension; all other cases have been 9482 // reported as errors elsewhere. 9483 // FIXME. Class extension does not have a LocEnd field. 9484 // CDecl->setLocEnd(RBrac); 9485 // Add ivar's to class extension's DeclContext. 9486 // Diagnose redeclaration of private ivars. 9487 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9488 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9489 if (IDecl) { 9490 if (const ObjCIvarDecl *ClsIvar = 9491 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9492 Diag(ClsFields[i]->getLocation(), 9493 diag::err_duplicate_ivar_declaration); 9494 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9495 continue; 9496 } 9497 for (const ObjCCategoryDecl *ClsExtDecl = 9498 IDecl->getFirstClassExtension(); 9499 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9500 if (const ObjCIvarDecl *ClsExtIvar = 9501 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9502 Diag(ClsFields[i]->getLocation(), 9503 diag::err_duplicate_ivar_declaration); 9504 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9505 continue; 9506 } 9507 } 9508 } 9509 ClsFields[i]->setLexicalDeclContext(CDecl); 9510 CDecl->addDecl(ClsFields[i]); 9511 } 9512 } 9513 } 9514 9515 if (Attr) 9516 ProcessDeclAttributeList(S, Record, Attr); 9517 9518 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9519 // set the visibility of this record. 9520 if (Record && !Record->getDeclContext()->isRecord()) 9521 AddPushedVisibilityAttribute(Record); 9522} 9523 9524/// \brief Determine whether the given integral value is representable within 9525/// the given type T. 9526static bool isRepresentableIntegerValue(ASTContext &Context, 9527 llvm::APSInt &Value, 9528 QualType T) { 9529 assert(T->isIntegralType(Context) && "Integral type required!"); 9530 unsigned BitWidth = Context.getIntWidth(T); 9531 9532 if (Value.isUnsigned() || Value.isNonNegative()) { 9533 if (T->isSignedIntegerOrEnumerationType()) 9534 --BitWidth; 9535 return Value.getActiveBits() <= BitWidth; 9536 } 9537 return Value.getMinSignedBits() <= BitWidth; 9538} 9539 9540// \brief Given an integral type, return the next larger integral type 9541// (or a NULL type of no such type exists). 9542static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9543 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9544 // enum checking below. 9545 assert(T->isIntegralType(Context) && "Integral type required!"); 9546 const unsigned NumTypes = 4; 9547 QualType SignedIntegralTypes[NumTypes] = { 9548 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9549 }; 9550 QualType UnsignedIntegralTypes[NumTypes] = { 9551 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9552 Context.UnsignedLongLongTy 9553 }; 9554 9555 unsigned BitWidth = Context.getTypeSize(T); 9556 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9557 : UnsignedIntegralTypes; 9558 for (unsigned I = 0; I != NumTypes; ++I) 9559 if (Context.getTypeSize(Types[I]) > BitWidth) 9560 return Types[I]; 9561 9562 return QualType(); 9563} 9564 9565EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9566 EnumConstantDecl *LastEnumConst, 9567 SourceLocation IdLoc, 9568 IdentifierInfo *Id, 9569 Expr *Val) { 9570 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9571 llvm::APSInt EnumVal(IntWidth); 9572 QualType EltTy; 9573 9574 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9575 Val = 0; 9576 9577 if (Val) 9578 Val = DefaultLvalueConversion(Val).take(); 9579 9580 if (Val) { 9581 if (Enum->isDependentType() || Val->isTypeDependent()) 9582 EltTy = Context.DependentTy; 9583 else { 9584 SourceLocation ExpLoc; 9585 if (getLangOptions().CPlusPlus0x && Enum->isFixed() && 9586 !getLangOptions().MicrosoftMode) { 9587 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the 9588 // constant-expression in the enumerator-definition shall be a converted 9589 // constant expression of the underlying type. 9590 EltTy = Enum->getIntegerType(); 9591 ExprResult Converted = 9592 CheckConvertedConstantExpression(Val, EltTy, EnumVal, 9593 CCEK_Enumerator); 9594 if (Converted.isInvalid()) 9595 Val = 0; 9596 else 9597 Val = Converted.take(); 9598 } else if (!Val->isValueDependent() && 9599 !(Val = VerifyIntegerConstantExpression(Val, 9600 &EnumVal).take())) { 9601 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9602 } else { 9603 if (!getLangOptions().CPlusPlus) { 9604 // C99 6.7.2.2p2: 9605 // The expression that defines the value of an enumeration constant 9606 // shall be an integer constant expression that has a value 9607 // representable as an int. 9608 9609 // Complain if the value is not representable in an int. 9610 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9611 Diag(IdLoc, diag::ext_enum_value_not_int) 9612 << EnumVal.toString(10) << Val->getSourceRange() 9613 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9614 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9615 // Force the type of the expression to 'int'. 9616 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9617 } 9618 } 9619 9620 if (Enum->isFixed()) { 9621 EltTy = Enum->getIntegerType(); 9622 9623 // In Obj-C and Microsoft mode, require the enumeration value to be 9624 // representable in the underlying type of the enumeration. In C++11, 9625 // we perform a non-narrowing conversion as part of converted constant 9626 // expression checking. 9627 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9628 if (getLangOptions().MicrosoftExt) { 9629 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9630 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9631 } else 9632 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy; 9633 } else 9634 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9635 } else { 9636 // C++11 [dcl.enum]p5: 9637 // If the underlying type is not fixed, the type of each enumerator 9638 // is the type of its initializing value: 9639 // - If an initializer is specified for an enumerator, the 9640 // initializing value has the same type as the expression. 9641 EltTy = Val->getType(); 9642 } 9643 } 9644 } 9645 } 9646 9647 if (!Val) { 9648 if (Enum->isDependentType()) 9649 EltTy = Context.DependentTy; 9650 else if (!LastEnumConst) { 9651 // C++0x [dcl.enum]p5: 9652 // If the underlying type is not fixed, the type of each enumerator 9653 // is the type of its initializing value: 9654 // - If no initializer is specified for the first enumerator, the 9655 // initializing value has an unspecified integral type. 9656 // 9657 // GCC uses 'int' for its unspecified integral type, as does 9658 // C99 6.7.2.2p3. 9659 if (Enum->isFixed()) { 9660 EltTy = Enum->getIntegerType(); 9661 } 9662 else { 9663 EltTy = Context.IntTy; 9664 } 9665 } else { 9666 // Assign the last value + 1. 9667 EnumVal = LastEnumConst->getInitVal(); 9668 ++EnumVal; 9669 EltTy = LastEnumConst->getType(); 9670 9671 // Check for overflow on increment. 9672 if (EnumVal < LastEnumConst->getInitVal()) { 9673 // C++0x [dcl.enum]p5: 9674 // If the underlying type is not fixed, the type of each enumerator 9675 // is the type of its initializing value: 9676 // 9677 // - Otherwise the type of the initializing value is the same as 9678 // the type of the initializing value of the preceding enumerator 9679 // unless the incremented value is not representable in that type, 9680 // in which case the type is an unspecified integral type 9681 // sufficient to contain the incremented value. If no such type 9682 // exists, the program is ill-formed. 9683 QualType T = getNextLargerIntegralType(Context, EltTy); 9684 if (T.isNull() || Enum->isFixed()) { 9685 // There is no integral type larger enough to represent this 9686 // value. Complain, then allow the value to wrap around. 9687 EnumVal = LastEnumConst->getInitVal(); 9688 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9689 ++EnumVal; 9690 if (Enum->isFixed()) 9691 // When the underlying type is fixed, this is ill-formed. 9692 Diag(IdLoc, diag::err_enumerator_wrapped) 9693 << EnumVal.toString(10) 9694 << EltTy; 9695 else 9696 Diag(IdLoc, diag::warn_enumerator_too_large) 9697 << EnumVal.toString(10); 9698 } else { 9699 EltTy = T; 9700 } 9701 9702 // Retrieve the last enumerator's value, extent that type to the 9703 // type that is supposed to be large enough to represent the incremented 9704 // value, then increment. 9705 EnumVal = LastEnumConst->getInitVal(); 9706 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9707 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9708 ++EnumVal; 9709 9710 // If we're not in C++, diagnose the overflow of enumerator values, 9711 // which in C99 means that the enumerator value is not representable in 9712 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9713 // permits enumerator values that are representable in some larger 9714 // integral type. 9715 if (!getLangOptions().CPlusPlus && !T.isNull()) 9716 Diag(IdLoc, diag::warn_enum_value_overflow); 9717 } else if (!getLangOptions().CPlusPlus && 9718 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9719 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9720 Diag(IdLoc, diag::ext_enum_value_not_int) 9721 << EnumVal.toString(10) << 1; 9722 } 9723 } 9724 } 9725 9726 if (!EltTy->isDependentType()) { 9727 // Make the enumerator value match the signedness and size of the 9728 // enumerator's type. 9729 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9730 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9731 } 9732 9733 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9734 Val, EnumVal); 9735} 9736 9737 9738Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9739 SourceLocation IdLoc, IdentifierInfo *Id, 9740 AttributeList *Attr, 9741 SourceLocation EqualLoc, Expr *Val) { 9742 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9743 EnumConstantDecl *LastEnumConst = 9744 cast_or_null<EnumConstantDecl>(lastEnumConst); 9745 9746 // The scope passed in may not be a decl scope. Zip up the scope tree until 9747 // we find one that is. 9748 S = getNonFieldDeclScope(S); 9749 9750 // Verify that there isn't already something declared with this name in this 9751 // scope. 9752 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9753 ForRedeclaration); 9754 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9755 // Maybe we will complain about the shadowed template parameter. 9756 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9757 // Just pretend that we didn't see the previous declaration. 9758 PrevDecl = 0; 9759 } 9760 9761 if (PrevDecl) { 9762 // When in C++, we may get a TagDecl with the same name; in this case the 9763 // enum constant will 'hide' the tag. 9764 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9765 "Received TagDecl when not in C++!"); 9766 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9767 if (isa<EnumConstantDecl>(PrevDecl)) 9768 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9769 else 9770 Diag(IdLoc, diag::err_redefinition) << Id; 9771 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9772 return 0; 9773 } 9774 } 9775 9776 // C++ [class.mem]p13: 9777 // If T is the name of a class, then each of the following shall have a 9778 // name different from T: 9779 // - every enumerator of every member of class T that is an enumerated 9780 // type 9781 if (CXXRecordDecl *Record 9782 = dyn_cast<CXXRecordDecl>( 9783 TheEnumDecl->getDeclContext()->getRedeclContext())) 9784 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9785 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9786 9787 EnumConstantDecl *New = 9788 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9789 9790 if (New) { 9791 // Process attributes. 9792 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9793 9794 // Register this decl in the current scope stack. 9795 New->setAccess(TheEnumDecl->getAccess()); 9796 PushOnScopeChains(New, S); 9797 } 9798 9799 return New; 9800} 9801 9802void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9803 SourceLocation RBraceLoc, Decl *EnumDeclX, 9804 Decl **Elements, unsigned NumElements, 9805 Scope *S, AttributeList *Attr) { 9806 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9807 QualType EnumType = Context.getTypeDeclType(Enum); 9808 9809 if (Attr) 9810 ProcessDeclAttributeList(S, Enum, Attr); 9811 9812 if (Enum->isDependentType()) { 9813 for (unsigned i = 0; i != NumElements; ++i) { 9814 EnumConstantDecl *ECD = 9815 cast_or_null<EnumConstantDecl>(Elements[i]); 9816 if (!ECD) continue; 9817 9818 ECD->setType(EnumType); 9819 } 9820 9821 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9822 return; 9823 } 9824 9825 // TODO: If the result value doesn't fit in an int, it must be a long or long 9826 // long value. ISO C does not support this, but GCC does as an extension, 9827 // emit a warning. 9828 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9829 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9830 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9831 9832 // Verify that all the values are okay, compute the size of the values, and 9833 // reverse the list. 9834 unsigned NumNegativeBits = 0; 9835 unsigned NumPositiveBits = 0; 9836 9837 // Keep track of whether all elements have type int. 9838 bool AllElementsInt = true; 9839 9840 for (unsigned i = 0; i != NumElements; ++i) { 9841 EnumConstantDecl *ECD = 9842 cast_or_null<EnumConstantDecl>(Elements[i]); 9843 if (!ECD) continue; // Already issued a diagnostic. 9844 9845 const llvm::APSInt &InitVal = ECD->getInitVal(); 9846 9847 // Keep track of the size of positive and negative values. 9848 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9849 NumPositiveBits = std::max(NumPositiveBits, 9850 (unsigned)InitVal.getActiveBits()); 9851 else 9852 NumNegativeBits = std::max(NumNegativeBits, 9853 (unsigned)InitVal.getMinSignedBits()); 9854 9855 // Keep track of whether every enum element has type int (very commmon). 9856 if (AllElementsInt) 9857 AllElementsInt = ECD->getType() == Context.IntTy; 9858 } 9859 9860 // Figure out the type that should be used for this enum. 9861 QualType BestType; 9862 unsigned BestWidth; 9863 9864 // C++0x N3000 [conv.prom]p3: 9865 // An rvalue of an unscoped enumeration type whose underlying 9866 // type is not fixed can be converted to an rvalue of the first 9867 // of the following types that can represent all the values of 9868 // the enumeration: int, unsigned int, long int, unsigned long 9869 // int, long long int, or unsigned long long int. 9870 // C99 6.4.4.3p2: 9871 // An identifier declared as an enumeration constant has type int. 9872 // The C99 rule is modified by a gcc extension 9873 QualType BestPromotionType; 9874 9875 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9876 // -fshort-enums is the equivalent to specifying the packed attribute on all 9877 // enum definitions. 9878 if (LangOpts.ShortEnums) 9879 Packed = true; 9880 9881 if (Enum->isFixed()) { 9882 BestType = Enum->getIntegerType(); 9883 if (BestType->isPromotableIntegerType()) 9884 BestPromotionType = Context.getPromotedIntegerType(BestType); 9885 else 9886 BestPromotionType = BestType; 9887 // We don't need to set BestWidth, because BestType is going to be the type 9888 // of the enumerators, but we do anyway because otherwise some compilers 9889 // warn that it might be used uninitialized. 9890 BestWidth = CharWidth; 9891 } 9892 else if (NumNegativeBits) { 9893 // If there is a negative value, figure out the smallest integer type (of 9894 // int/long/longlong) that fits. 9895 // If it's packed, check also if it fits a char or a short. 9896 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9897 BestType = Context.SignedCharTy; 9898 BestWidth = CharWidth; 9899 } else if (Packed && NumNegativeBits <= ShortWidth && 9900 NumPositiveBits < ShortWidth) { 9901 BestType = Context.ShortTy; 9902 BestWidth = ShortWidth; 9903 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9904 BestType = Context.IntTy; 9905 BestWidth = IntWidth; 9906 } else { 9907 BestWidth = Context.getTargetInfo().getLongWidth(); 9908 9909 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9910 BestType = Context.LongTy; 9911 } else { 9912 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9913 9914 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9915 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9916 BestType = Context.LongLongTy; 9917 } 9918 } 9919 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9920 } else { 9921 // If there is no negative value, figure out the smallest type that fits 9922 // all of the enumerator values. 9923 // If it's packed, check also if it fits a char or a short. 9924 if (Packed && NumPositiveBits <= CharWidth) { 9925 BestType = Context.UnsignedCharTy; 9926 BestPromotionType = Context.IntTy; 9927 BestWidth = CharWidth; 9928 } else if (Packed && NumPositiveBits <= ShortWidth) { 9929 BestType = Context.UnsignedShortTy; 9930 BestPromotionType = Context.IntTy; 9931 BestWidth = ShortWidth; 9932 } else if (NumPositiveBits <= IntWidth) { 9933 BestType = Context.UnsignedIntTy; 9934 BestWidth = IntWidth; 9935 BestPromotionType 9936 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9937 ? Context.UnsignedIntTy : Context.IntTy; 9938 } else if (NumPositiveBits <= 9939 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9940 BestType = Context.UnsignedLongTy; 9941 BestPromotionType 9942 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9943 ? Context.UnsignedLongTy : Context.LongTy; 9944 } else { 9945 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9946 assert(NumPositiveBits <= BestWidth && 9947 "How could an initializer get larger than ULL?"); 9948 BestType = Context.UnsignedLongLongTy; 9949 BestPromotionType 9950 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9951 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9952 } 9953 } 9954 9955 // Loop over all of the enumerator constants, changing their types to match 9956 // the type of the enum if needed. 9957 for (unsigned i = 0; i != NumElements; ++i) { 9958 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9959 if (!ECD) continue; // Already issued a diagnostic. 9960 9961 // Standard C says the enumerators have int type, but we allow, as an 9962 // extension, the enumerators to be larger than int size. If each 9963 // enumerator value fits in an int, type it as an int, otherwise type it the 9964 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9965 // that X has type 'int', not 'unsigned'. 9966 9967 // Determine whether the value fits into an int. 9968 llvm::APSInt InitVal = ECD->getInitVal(); 9969 9970 // If it fits into an integer type, force it. Otherwise force it to match 9971 // the enum decl type. 9972 QualType NewTy; 9973 unsigned NewWidth; 9974 bool NewSign; 9975 if (!getLangOptions().CPlusPlus && 9976 !Enum->isFixed() && 9977 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9978 NewTy = Context.IntTy; 9979 NewWidth = IntWidth; 9980 NewSign = true; 9981 } else if (ECD->getType() == BestType) { 9982 // Already the right type! 9983 if (getLangOptions().CPlusPlus) 9984 // C++ [dcl.enum]p4: Following the closing brace of an 9985 // enum-specifier, each enumerator has the type of its 9986 // enumeration. 9987 ECD->setType(EnumType); 9988 continue; 9989 } else { 9990 NewTy = BestType; 9991 NewWidth = BestWidth; 9992 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9993 } 9994 9995 // Adjust the APSInt value. 9996 InitVal = InitVal.extOrTrunc(NewWidth); 9997 InitVal.setIsSigned(NewSign); 9998 ECD->setInitVal(InitVal); 9999 10000 // Adjust the Expr initializer and type. 10001 if (ECD->getInitExpr() && 10002 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 10003 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 10004 CK_IntegralCast, 10005 ECD->getInitExpr(), 10006 /*base paths*/ 0, 10007 VK_RValue)); 10008 if (getLangOptions().CPlusPlus) 10009 // C++ [dcl.enum]p4: Following the closing brace of an 10010 // enum-specifier, each enumerator has the type of its 10011 // enumeration. 10012 ECD->setType(EnumType); 10013 else 10014 ECD->setType(NewTy); 10015 } 10016 10017 Enum->completeDefinition(BestType, BestPromotionType, 10018 NumPositiveBits, NumNegativeBits); 10019} 10020 10021Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 10022 SourceLocation StartLoc, 10023 SourceLocation EndLoc) { 10024 StringLiteral *AsmString = cast<StringLiteral>(expr); 10025 10026 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 10027 AsmString, StartLoc, 10028 EndLoc); 10029 CurContext->addDecl(New); 10030 return New; 10031} 10032 10033DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 10034 SourceLocation ImportLoc, 10035 ModuleIdPath Path) { 10036 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 10037 Module::AllVisible, 10038 /*IsIncludeDirective=*/false); 10039 if (!Mod) 10040 return true; 10041 10042 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 10043 Module *ModCheck = Mod; 10044 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 10045 // If we've run out of module parents, just drop the remaining identifiers. 10046 // We need the length to be consistent. 10047 if (!ModCheck) 10048 break; 10049 ModCheck = ModCheck->Parent; 10050 10051 IdentifierLocs.push_back(Path[I].second); 10052 } 10053 10054 ImportDecl *Import = ImportDecl::Create(Context, 10055 Context.getTranslationUnitDecl(), 10056 AtLoc.isValid()? AtLoc : ImportLoc, 10057 Mod, IdentifierLocs); 10058 Context.getTranslationUnitDecl()->addDecl(Import); 10059 return Import; 10060} 10061 10062void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 10063 SourceLocation PragmaLoc, 10064 SourceLocation NameLoc) { 10065 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 10066 10067 if (PrevDecl) { 10068 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 10069 } else { 10070 (void)WeakUndeclaredIdentifiers.insert( 10071 std::pair<IdentifierInfo*,WeakInfo> 10072 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 10073 } 10074} 10075 10076void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 10077 IdentifierInfo* AliasName, 10078 SourceLocation PragmaLoc, 10079 SourceLocation NameLoc, 10080 SourceLocation AliasNameLoc) { 10081 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 10082 LookupOrdinaryName); 10083 WeakInfo W = WeakInfo(Name, NameLoc); 10084 10085 if (PrevDecl) { 10086 if (!PrevDecl->hasAttr<AliasAttr>()) 10087 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 10088 DeclApplyPragmaWeak(TUScope, ND, W); 10089 } else { 10090 (void)WeakUndeclaredIdentifiers.insert( 10091 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 10092 } 10093} 10094 10095Decl *Sema::getObjCDeclContext() const { 10096 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 10097} 10098 10099AvailabilityResult Sema::getCurContextAvailability() const { 10100 const Decl *D = cast<Decl>(getCurLexicalContext()); 10101 // A category implicitly has the availability of the interface. 10102 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 10103 D = CatD->getClassInterface(); 10104 10105 return D->getAvailability(); 10106} 10107