SemaDecl.cpp revision 8be0c74e4a779b13c2d8fd8482dcd438eeb089d3
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/APValue.h" 22#include "clang/AST/ASTConsumer.h" 23#include "clang/AST/ASTContext.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclCXX.h" 26#include "clang/AST/DeclObjC.h" 27#include "clang/AST/DeclTemplate.h" 28#include "clang/AST/EvaluatedExprVisitor.h" 29#include "clang/AST/ExprCXX.h" 30#include "clang/AST/StmtCXX.h" 31#include "clang/AST/CharUnits.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/ParsedTemplate.h" 34#include "clang/Parse/ParseDiagnostic.h" 35#include "clang/Basic/PartialDiagnostic.h" 36#include "clang/Basic/SourceManager.h" 37#include "clang/Basic/TargetInfo.h" 38// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 39#include "clang/Lex/Preprocessor.h" 40#include "clang/Lex/HeaderSearch.h" 41#include "clang/Lex/ModuleLoader.h" 42#include "llvm/ADT/Triple.h" 43#include <algorithm> 44#include <cstring> 45#include <functional> 46using namespace clang; 47using namespace sema; 48 49Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 50 if (OwnedType) { 51 Decl *Group[2] = { OwnedType, Ptr }; 52 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 53 } 54 55 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 56} 57 58/// \brief If the identifier refers to a type name within this scope, 59/// return the declaration of that type. 60/// 61/// This routine performs ordinary name lookup of the identifier II 62/// within the given scope, with optional C++ scope specifier SS, to 63/// determine whether the name refers to a type. If so, returns an 64/// opaque pointer (actually a QualType) corresponding to that 65/// type. Otherwise, returns NULL. 66/// 67/// If name lookup results in an ambiguity, this routine will complain 68/// and then return NULL. 69ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 70 Scope *S, CXXScopeSpec *SS, 71 bool isClassName, bool HasTrailingDot, 72 ParsedType ObjectTypePtr, 73 bool WantNontrivialTypeSourceInfo) { 74 // Determine where we will perform name lookup. 75 DeclContext *LookupCtx = 0; 76 if (ObjectTypePtr) { 77 QualType ObjectType = ObjectTypePtr.get(); 78 if (ObjectType->isRecordType()) 79 LookupCtx = computeDeclContext(ObjectType); 80 } else if (SS && SS->isNotEmpty()) { 81 LookupCtx = computeDeclContext(*SS, false); 82 83 if (!LookupCtx) { 84 if (isDependentScopeSpecifier(*SS)) { 85 // C++ [temp.res]p3: 86 // A qualified-id that refers to a type and in which the 87 // nested-name-specifier depends on a template-parameter (14.6.2) 88 // shall be prefixed by the keyword typename to indicate that the 89 // qualified-id denotes a type, forming an 90 // elaborated-type-specifier (7.1.5.3). 91 // 92 // We therefore do not perform any name lookup if the result would 93 // refer to a member of an unknown specialization. 94 if (!isClassName) 95 return ParsedType(); 96 97 // We know from the grammar that this name refers to a type, 98 // so build a dependent node to describe the type. 99 if (WantNontrivialTypeSourceInfo) 100 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 101 102 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 103 QualType T = 104 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 105 II, NameLoc); 106 107 return ParsedType::make(T); 108 } 109 110 return ParsedType(); 111 } 112 113 if (!LookupCtx->isDependentContext() && 114 RequireCompleteDeclContext(*SS, LookupCtx)) 115 return ParsedType(); 116 } 117 118 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 119 // lookup for class-names. 120 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 121 LookupOrdinaryName; 122 LookupResult Result(*this, &II, NameLoc, Kind); 123 if (LookupCtx) { 124 // Perform "qualified" name lookup into the declaration context we 125 // computed, which is either the type of the base of a member access 126 // expression or the declaration context associated with a prior 127 // nested-name-specifier. 128 LookupQualifiedName(Result, LookupCtx); 129 130 if (ObjectTypePtr && Result.empty()) { 131 // C++ [basic.lookup.classref]p3: 132 // If the unqualified-id is ~type-name, the type-name is looked up 133 // in the context of the entire postfix-expression. If the type T of 134 // the object expression is of a class type C, the type-name is also 135 // looked up in the scope of class C. At least one of the lookups shall 136 // find a name that refers to (possibly cv-qualified) T. 137 LookupName(Result, S); 138 } 139 } else { 140 // Perform unqualified name lookup. 141 LookupName(Result, S); 142 } 143 144 NamedDecl *IIDecl = 0; 145 switch (Result.getResultKind()) { 146 case LookupResult::NotFound: 147 case LookupResult::NotFoundInCurrentInstantiation: 148 case LookupResult::FoundOverloaded: 149 case LookupResult::FoundUnresolvedValue: 150 Result.suppressDiagnostics(); 151 return ParsedType(); 152 153 case LookupResult::Ambiguous: 154 // Recover from type-hiding ambiguities by hiding the type. We'll 155 // do the lookup again when looking for an object, and we can 156 // diagnose the error then. If we don't do this, then the error 157 // about hiding the type will be immediately followed by an error 158 // that only makes sense if the identifier was treated like a type. 159 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 160 Result.suppressDiagnostics(); 161 return ParsedType(); 162 } 163 164 // Look to see if we have a type anywhere in the list of results. 165 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 166 Res != ResEnd; ++Res) { 167 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 168 if (!IIDecl || 169 (*Res)->getLocation().getRawEncoding() < 170 IIDecl->getLocation().getRawEncoding()) 171 IIDecl = *Res; 172 } 173 } 174 175 if (!IIDecl) { 176 // None of the entities we found is a type, so there is no way 177 // to even assume that the result is a type. In this case, don't 178 // complain about the ambiguity. The parser will either try to 179 // perform this lookup again (e.g., as an object name), which 180 // will produce the ambiguity, or will complain that it expected 181 // a type name. 182 Result.suppressDiagnostics(); 183 return ParsedType(); 184 } 185 186 // We found a type within the ambiguous lookup; diagnose the 187 // ambiguity and then return that type. This might be the right 188 // answer, or it might not be, but it suppresses any attempt to 189 // perform the name lookup again. 190 break; 191 192 case LookupResult::Found: 193 IIDecl = Result.getFoundDecl(); 194 break; 195 } 196 197 assert(IIDecl && "Didn't find decl"); 198 199 QualType T; 200 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 201 DiagnoseUseOfDecl(IIDecl, NameLoc); 202 203 if (T.isNull()) 204 T = Context.getTypeDeclType(TD); 205 206 if (SS && SS->isNotEmpty()) { 207 if (WantNontrivialTypeSourceInfo) { 208 // Construct a type with type-source information. 209 TypeLocBuilder Builder; 210 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 211 212 T = getElaboratedType(ETK_None, *SS, T); 213 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 214 ElabTL.setKeywordLoc(SourceLocation()); 215 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 216 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 217 } else { 218 T = getElaboratedType(ETK_None, *SS, T); 219 } 220 } 221 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 222 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 223 if (!HasTrailingDot) 224 T = Context.getObjCInterfaceType(IDecl); 225 } 226 227 if (T.isNull()) { 228 // If it's not plausibly a type, suppress diagnostics. 229 Result.suppressDiagnostics(); 230 return ParsedType(); 231 } 232 return ParsedType::make(T); 233} 234 235/// isTagName() - This method is called *for error recovery purposes only* 236/// to determine if the specified name is a valid tag name ("struct foo"). If 237/// so, this returns the TST for the tag corresponding to it (TST_enum, 238/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 239/// where the user forgot to specify the tag. 240DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 241 // Do a tag name lookup in this scope. 242 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 243 LookupName(R, S, false); 244 R.suppressDiagnostics(); 245 if (R.getResultKind() == LookupResult::Found) 246 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 247 switch (TD->getTagKind()) { 248 default: return DeclSpec::TST_unspecified; 249 case TTK_Struct: return DeclSpec::TST_struct; 250 case TTK_Union: return DeclSpec::TST_union; 251 case TTK_Class: return DeclSpec::TST_class; 252 case TTK_Enum: return DeclSpec::TST_enum; 253 } 254 } 255 256 return DeclSpec::TST_unspecified; 257} 258 259/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 260/// if a CXXScopeSpec's type is equal to the type of one of the base classes 261/// then downgrade the missing typename error to a warning. 262/// This is needed for MSVC compatibility; Example: 263/// @code 264/// template<class T> class A { 265/// public: 266/// typedef int TYPE; 267/// }; 268/// template<class T> class B : public A<T> { 269/// public: 270/// A<T>::TYPE a; // no typename required because A<T> is a base class. 271/// }; 272/// @endcode 273bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS) { 274 if (CurContext->isRecord()) { 275 const Type *Ty = SS->getScopeRep()->getAsType(); 276 277 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 278 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 279 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 280 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 281 return true; 282 } 283 return false; 284} 285 286bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 287 SourceLocation IILoc, 288 Scope *S, 289 CXXScopeSpec *SS, 290 ParsedType &SuggestedType) { 291 // We don't have anything to suggest (yet). 292 SuggestedType = ParsedType(); 293 294 // There may have been a typo in the name of the type. Look up typo 295 // results, in case we have something that we can suggest. 296 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 297 LookupOrdinaryName, S, SS, NULL, 298 false, CTC_Type)) { 299 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 300 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 301 302 if (Corrected.isKeyword()) { 303 // We corrected to a keyword. 304 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 305 Diag(IILoc, diag::err_unknown_typename_suggest) 306 << &II << CorrectedQuotedStr; 307 return true; 308 } else { 309 NamedDecl *Result = Corrected.getCorrectionDecl(); 310 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 311 !Result->isInvalidDecl()) { 312 // We found a similarly-named type or interface; suggest that. 313 if (!SS || !SS->isSet()) 314 Diag(IILoc, diag::err_unknown_typename_suggest) 315 << &II << CorrectedQuotedStr 316 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 317 else if (DeclContext *DC = computeDeclContext(*SS, false)) 318 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 319 << &II << DC << CorrectedQuotedStr << SS->getRange() 320 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 321 else 322 llvm_unreachable("could not have corrected a typo here"); 323 324 Diag(Result->getLocation(), diag::note_previous_decl) 325 << CorrectedQuotedStr; 326 327 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 328 false, false, ParsedType(), 329 /*NonTrivialTypeSourceInfo=*/true); 330 return true; 331 } 332 } 333 } 334 335 if (getLangOptions().CPlusPlus) { 336 // See if II is a class template that the user forgot to pass arguments to. 337 UnqualifiedId Name; 338 Name.setIdentifier(&II, IILoc); 339 CXXScopeSpec EmptySS; 340 TemplateTy TemplateResult; 341 bool MemberOfUnknownSpecialization; 342 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 343 Name, ParsedType(), true, TemplateResult, 344 MemberOfUnknownSpecialization) == TNK_Type_template) { 345 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 346 Diag(IILoc, diag::err_template_missing_args) << TplName; 347 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 348 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 349 << TplDecl->getTemplateParameters()->getSourceRange(); 350 } 351 return true; 352 } 353 } 354 355 // FIXME: Should we move the logic that tries to recover from a missing tag 356 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 357 358 if (!SS || (!SS->isSet() && !SS->isInvalid())) 359 Diag(IILoc, diag::err_unknown_typename) << &II; 360 else if (DeclContext *DC = computeDeclContext(*SS, false)) 361 Diag(IILoc, diag::err_typename_nested_not_found) 362 << &II << DC << SS->getRange(); 363 else if (isDependentScopeSpecifier(*SS)) { 364 unsigned DiagID = diag::err_typename_missing; 365 if (getLangOptions().MicrosoftExt && isMicrosoftMissingTypename(SS)) 366 DiagID = diag::warn_typename_missing; 367 368 Diag(SS->getRange().getBegin(), DiagID) 369 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 370 << SourceRange(SS->getRange().getBegin(), IILoc) 371 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 372 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 373 } else { 374 assert(SS && SS->isInvalid() && 375 "Invalid scope specifier has already been diagnosed"); 376 } 377 378 return true; 379} 380 381/// \brief Determine whether the given result set contains either a type name 382/// or 383static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 384 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 385 NextToken.is(tok::less); 386 387 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 388 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 389 return true; 390 391 if (CheckTemplate && isa<TemplateDecl>(*I)) 392 return true; 393 } 394 395 return false; 396} 397 398Sema::NameClassification Sema::ClassifyName(Scope *S, 399 CXXScopeSpec &SS, 400 IdentifierInfo *&Name, 401 SourceLocation NameLoc, 402 const Token &NextToken) { 403 DeclarationNameInfo NameInfo(Name, NameLoc); 404 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 405 406 if (NextToken.is(tok::coloncolon)) { 407 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 408 QualType(), false, SS, 0, false); 409 410 } 411 412 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 413 LookupParsedName(Result, S, &SS, !CurMethod); 414 415 // Perform lookup for Objective-C instance variables (including automatically 416 // synthesized instance variables), if we're in an Objective-C method. 417 // FIXME: This lookup really, really needs to be folded in to the normal 418 // unqualified lookup mechanism. 419 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 420 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 421 if (E.get() || E.isInvalid()) 422 return E; 423 } 424 425 bool SecondTry = false; 426 bool IsFilteredTemplateName = false; 427 428Corrected: 429 switch (Result.getResultKind()) { 430 case LookupResult::NotFound: 431 // If an unqualified-id is followed by a '(', then we have a function 432 // call. 433 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 434 // In C++, this is an ADL-only call. 435 // FIXME: Reference? 436 if (getLangOptions().CPlusPlus) 437 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 438 439 // C90 6.3.2.2: 440 // If the expression that precedes the parenthesized argument list in a 441 // function call consists solely of an identifier, and if no 442 // declaration is visible for this identifier, the identifier is 443 // implicitly declared exactly as if, in the innermost block containing 444 // the function call, the declaration 445 // 446 // extern int identifier (); 447 // 448 // appeared. 449 // 450 // We also allow this in C99 as an extension. 451 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 452 Result.addDecl(D); 453 Result.resolveKind(); 454 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 455 } 456 } 457 458 // In C, we first see whether there is a tag type by the same name, in 459 // which case it's likely that the user just forget to write "enum", 460 // "struct", or "union". 461 if (!getLangOptions().CPlusPlus && !SecondTry) { 462 Result.clear(LookupTagName); 463 LookupParsedName(Result, S, &SS); 464 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 465 const char *TagName = 0; 466 const char *FixItTagName = 0; 467 switch (Tag->getTagKind()) { 468 case TTK_Class: 469 TagName = "class"; 470 FixItTagName = "class "; 471 break; 472 473 case TTK_Enum: 474 TagName = "enum"; 475 FixItTagName = "enum "; 476 break; 477 478 case TTK_Struct: 479 TagName = "struct"; 480 FixItTagName = "struct "; 481 break; 482 483 case TTK_Union: 484 TagName = "union"; 485 FixItTagName = "union "; 486 break; 487 } 488 489 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 490 << Name << TagName << getLangOptions().CPlusPlus 491 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 492 break; 493 } 494 495 Result.clear(LookupOrdinaryName); 496 } 497 498 // Perform typo correction to determine if there is another name that is 499 // close to this name. 500 if (!SecondTry) { 501 SecondTry = true; 502 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 503 Result.getLookupKind(), S, &SS)) { 504 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 505 unsigned QualifiedDiag = diag::err_no_member_suggest; 506 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 507 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 508 509 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 510 NamedDecl *UnderlyingFirstDecl 511 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 512 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 513 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 514 UnqualifiedDiag = diag::err_no_template_suggest; 515 QualifiedDiag = diag::err_no_member_template_suggest; 516 } else if (UnderlyingFirstDecl && 517 (isa<TypeDecl>(UnderlyingFirstDecl) || 518 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 519 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 520 UnqualifiedDiag = diag::err_unknown_typename_suggest; 521 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 522 } 523 524 if (SS.isEmpty()) 525 Diag(NameLoc, UnqualifiedDiag) 526 << Name << CorrectedQuotedStr 527 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 528 else 529 Diag(NameLoc, QualifiedDiag) 530 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 531 << SS.getRange() 532 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 533 534 // Update the name, so that the caller has the new name. 535 Name = Corrected.getCorrectionAsIdentifierInfo(); 536 537 // Also update the LookupResult... 538 // FIXME: This should probably go away at some point 539 Result.clear(); 540 Result.setLookupName(Corrected.getCorrection()); 541 if (FirstDecl) Result.addDecl(FirstDecl); 542 543 // Typo correction corrected to a keyword. 544 if (Corrected.isKeyword()) 545 return Corrected.getCorrectionAsIdentifierInfo(); 546 547 if (FirstDecl) 548 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 549 << CorrectedQuotedStr; 550 551 // If we found an Objective-C instance variable, let 552 // LookupInObjCMethod build the appropriate expression to 553 // reference the ivar. 554 // FIXME: This is a gross hack. 555 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 556 Result.clear(); 557 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 558 return move(E); 559 } 560 561 goto Corrected; 562 } 563 } 564 565 // We failed to correct; just fall through and let the parser deal with it. 566 Result.suppressDiagnostics(); 567 return NameClassification::Unknown(); 568 569 case LookupResult::NotFoundInCurrentInstantiation: 570 // We performed name lookup into the current instantiation, and there were 571 // dependent bases, so we treat this result the same way as any other 572 // dependent nested-name-specifier. 573 574 // C++ [temp.res]p2: 575 // A name used in a template declaration or definition and that is 576 // dependent on a template-parameter is assumed not to name a type 577 // unless the applicable name lookup finds a type name or the name is 578 // qualified by the keyword typename. 579 // 580 // FIXME: If the next token is '<', we might want to ask the parser to 581 // perform some heroics to see if we actually have a 582 // template-argument-list, which would indicate a missing 'template' 583 // keyword here. 584 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 585 586 case LookupResult::Found: 587 case LookupResult::FoundOverloaded: 588 case LookupResult::FoundUnresolvedValue: 589 break; 590 591 case LookupResult::Ambiguous: 592 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 593 hasAnyAcceptableTemplateNames(Result)) { 594 // C++ [temp.local]p3: 595 // A lookup that finds an injected-class-name (10.2) can result in an 596 // ambiguity in certain cases (for example, if it is found in more than 597 // one base class). If all of the injected-class-names that are found 598 // refer to specializations of the same class template, and if the name 599 // is followed by a template-argument-list, the reference refers to the 600 // class template itself and not a specialization thereof, and is not 601 // ambiguous. 602 // 603 // This filtering can make an ambiguous result into an unambiguous one, 604 // so try again after filtering out template names. 605 FilterAcceptableTemplateNames(Result); 606 if (!Result.isAmbiguous()) { 607 IsFilteredTemplateName = true; 608 break; 609 } 610 } 611 612 // Diagnose the ambiguity and return an error. 613 return NameClassification::Error(); 614 } 615 616 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 617 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 618 // C++ [temp.names]p3: 619 // After name lookup (3.4) finds that a name is a template-name or that 620 // an operator-function-id or a literal- operator-id refers to a set of 621 // overloaded functions any member of which is a function template if 622 // this is followed by a <, the < is always taken as the delimiter of a 623 // template-argument-list and never as the less-than operator. 624 if (!IsFilteredTemplateName) 625 FilterAcceptableTemplateNames(Result); 626 627 if (!Result.empty()) { 628 bool IsFunctionTemplate; 629 TemplateName Template; 630 if (Result.end() - Result.begin() > 1) { 631 IsFunctionTemplate = true; 632 Template = Context.getOverloadedTemplateName(Result.begin(), 633 Result.end()); 634 } else { 635 TemplateDecl *TD 636 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 637 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 638 639 if (SS.isSet() && !SS.isInvalid()) 640 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 641 /*TemplateKeyword=*/false, 642 TD); 643 else 644 Template = TemplateName(TD); 645 } 646 647 if (IsFunctionTemplate) { 648 // Function templates always go through overload resolution, at which 649 // point we'll perform the various checks (e.g., accessibility) we need 650 // to based on which function we selected. 651 Result.suppressDiagnostics(); 652 653 return NameClassification::FunctionTemplate(Template); 654 } 655 656 return NameClassification::TypeTemplate(Template); 657 } 658 } 659 660 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 661 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 662 DiagnoseUseOfDecl(Type, NameLoc); 663 QualType T = Context.getTypeDeclType(Type); 664 return ParsedType::make(T); 665 } 666 667 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 668 if (!Class) { 669 // FIXME: It's unfortunate that we don't have a Type node for handling this. 670 if (ObjCCompatibleAliasDecl *Alias 671 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 672 Class = Alias->getClassInterface(); 673 } 674 675 if (Class) { 676 DiagnoseUseOfDecl(Class, NameLoc); 677 678 if (NextToken.is(tok::period)) { 679 // Interface. <something> is parsed as a property reference expression. 680 // Just return "unknown" as a fall-through for now. 681 Result.suppressDiagnostics(); 682 return NameClassification::Unknown(); 683 } 684 685 QualType T = Context.getObjCInterfaceType(Class); 686 return ParsedType::make(T); 687 } 688 689 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 690 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 691 692 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 693 return BuildDeclarationNameExpr(SS, Result, ADL); 694} 695 696// Determines the context to return to after temporarily entering a 697// context. This depends in an unnecessarily complicated way on the 698// exact ordering of callbacks from the parser. 699DeclContext *Sema::getContainingDC(DeclContext *DC) { 700 701 // Functions defined inline within classes aren't parsed until we've 702 // finished parsing the top-level class, so the top-level class is 703 // the context we'll need to return to. 704 if (isa<FunctionDecl>(DC)) { 705 DC = DC->getLexicalParent(); 706 707 // A function not defined within a class will always return to its 708 // lexical context. 709 if (!isa<CXXRecordDecl>(DC)) 710 return DC; 711 712 // A C++ inline method/friend is parsed *after* the topmost class 713 // it was declared in is fully parsed ("complete"); the topmost 714 // class is the context we need to return to. 715 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 716 DC = RD; 717 718 // Return the declaration context of the topmost class the inline method is 719 // declared in. 720 return DC; 721 } 722 723 return DC->getLexicalParent(); 724} 725 726void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 727 assert(getContainingDC(DC) == CurContext && 728 "The next DeclContext should be lexically contained in the current one."); 729 CurContext = DC; 730 S->setEntity(DC); 731} 732 733void Sema::PopDeclContext() { 734 assert(CurContext && "DeclContext imbalance!"); 735 736 CurContext = getContainingDC(CurContext); 737 assert(CurContext && "Popped translation unit!"); 738} 739 740/// EnterDeclaratorContext - Used when we must lookup names in the context 741/// of a declarator's nested name specifier. 742/// 743void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 744 // C++0x [basic.lookup.unqual]p13: 745 // A name used in the definition of a static data member of class 746 // X (after the qualified-id of the static member) is looked up as 747 // if the name was used in a member function of X. 748 // C++0x [basic.lookup.unqual]p14: 749 // If a variable member of a namespace is defined outside of the 750 // scope of its namespace then any name used in the definition of 751 // the variable member (after the declarator-id) is looked up as 752 // if the definition of the variable member occurred in its 753 // namespace. 754 // Both of these imply that we should push a scope whose context 755 // is the semantic context of the declaration. We can't use 756 // PushDeclContext here because that context is not necessarily 757 // lexically contained in the current context. Fortunately, 758 // the containing scope should have the appropriate information. 759 760 assert(!S->getEntity() && "scope already has entity"); 761 762#ifndef NDEBUG 763 Scope *Ancestor = S->getParent(); 764 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 765 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 766#endif 767 768 CurContext = DC; 769 S->setEntity(DC); 770} 771 772void Sema::ExitDeclaratorContext(Scope *S) { 773 assert(S->getEntity() == CurContext && "Context imbalance!"); 774 775 // Switch back to the lexical context. The safety of this is 776 // enforced by an assert in EnterDeclaratorContext. 777 Scope *Ancestor = S->getParent(); 778 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 779 CurContext = (DeclContext*) Ancestor->getEntity(); 780 781 // We don't need to do anything with the scope, which is going to 782 // disappear. 783} 784 785 786void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 787 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 788 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 789 // We assume that the caller has already called 790 // ActOnReenterTemplateScope 791 FD = TFD->getTemplatedDecl(); 792 } 793 if (!FD) 794 return; 795 796 PushDeclContext(S, FD); 797 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 798 ParmVarDecl *Param = FD->getParamDecl(P); 799 // If the parameter has an identifier, then add it to the scope 800 if (Param->getIdentifier()) { 801 S->AddDecl(Param); 802 IdResolver.AddDecl(Param); 803 } 804 } 805} 806 807 808/// \brief Determine whether we allow overloading of the function 809/// PrevDecl with another declaration. 810/// 811/// This routine determines whether overloading is possible, not 812/// whether some new function is actually an overload. It will return 813/// true in C++ (where we can always provide overloads) or, as an 814/// extension, in C when the previous function is already an 815/// overloaded function declaration or has the "overloadable" 816/// attribute. 817static bool AllowOverloadingOfFunction(LookupResult &Previous, 818 ASTContext &Context) { 819 if (Context.getLangOptions().CPlusPlus) 820 return true; 821 822 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 823 return true; 824 825 return (Previous.getResultKind() == LookupResult::Found 826 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 827} 828 829/// Add this decl to the scope shadowed decl chains. 830void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 831 // Move up the scope chain until we find the nearest enclosing 832 // non-transparent context. The declaration will be introduced into this 833 // scope. 834 while (S->getEntity() && 835 ((DeclContext *)S->getEntity())->isTransparentContext()) 836 S = S->getParent(); 837 838 // Add scoped declarations into their context, so that they can be 839 // found later. Declarations without a context won't be inserted 840 // into any context. 841 if (AddToContext) 842 CurContext->addDecl(D); 843 844 // Out-of-line definitions shouldn't be pushed into scope in C++. 845 // Out-of-line variable and function definitions shouldn't even in C. 846 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 847 D->isOutOfLine()) 848 return; 849 850 // Template instantiations should also not be pushed into scope. 851 if (isa<FunctionDecl>(D) && 852 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 853 return; 854 855 // If this replaces anything in the current scope, 856 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 857 IEnd = IdResolver.end(); 858 for (; I != IEnd; ++I) { 859 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 860 S->RemoveDecl(*I); 861 IdResolver.RemoveDecl(*I); 862 863 // Should only need to replace one decl. 864 break; 865 } 866 } 867 868 S->AddDecl(D); 869 870 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 871 // Implicitly-generated labels may end up getting generated in an order that 872 // isn't strictly lexical, which breaks name lookup. Be careful to insert 873 // the label at the appropriate place in the identifier chain. 874 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 875 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 876 if (IDC == CurContext) { 877 if (!S->isDeclScope(*I)) 878 continue; 879 } else if (IDC->Encloses(CurContext)) 880 break; 881 } 882 883 IdResolver.InsertDeclAfter(I, D); 884 } else { 885 IdResolver.AddDecl(D); 886 } 887} 888 889bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 890 bool ExplicitInstantiationOrSpecialization) { 891 return IdResolver.isDeclInScope(D, Ctx, Context, S, 892 ExplicitInstantiationOrSpecialization); 893} 894 895Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 896 DeclContext *TargetDC = DC->getPrimaryContext(); 897 do { 898 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 899 if (ScopeDC->getPrimaryContext() == TargetDC) 900 return S; 901 } while ((S = S->getParent())); 902 903 return 0; 904} 905 906static bool isOutOfScopePreviousDeclaration(NamedDecl *, 907 DeclContext*, 908 ASTContext&); 909 910/// Filters out lookup results that don't fall within the given scope 911/// as determined by isDeclInScope. 912void Sema::FilterLookupForScope(LookupResult &R, 913 DeclContext *Ctx, Scope *S, 914 bool ConsiderLinkage, 915 bool ExplicitInstantiationOrSpecialization) { 916 LookupResult::Filter F = R.makeFilter(); 917 while (F.hasNext()) { 918 NamedDecl *D = F.next(); 919 920 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 921 continue; 922 923 if (ConsiderLinkage && 924 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 925 continue; 926 927 F.erase(); 928 } 929 930 F.done(); 931} 932 933static bool isUsingDecl(NamedDecl *D) { 934 return isa<UsingShadowDecl>(D) || 935 isa<UnresolvedUsingTypenameDecl>(D) || 936 isa<UnresolvedUsingValueDecl>(D); 937} 938 939/// Removes using shadow declarations from the lookup results. 940static void RemoveUsingDecls(LookupResult &R) { 941 LookupResult::Filter F = R.makeFilter(); 942 while (F.hasNext()) 943 if (isUsingDecl(F.next())) 944 F.erase(); 945 946 F.done(); 947} 948 949/// \brief Check for this common pattern: 950/// @code 951/// class S { 952/// S(const S&); // DO NOT IMPLEMENT 953/// void operator=(const S&); // DO NOT IMPLEMENT 954/// }; 955/// @endcode 956static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 957 // FIXME: Should check for private access too but access is set after we get 958 // the decl here. 959 if (D->doesThisDeclarationHaveABody()) 960 return false; 961 962 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 963 return CD->isCopyConstructor(); 964 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 965 return Method->isCopyAssignmentOperator(); 966 return false; 967} 968 969bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 970 assert(D); 971 972 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 973 return false; 974 975 // Ignore class templates. 976 if (D->getDeclContext()->isDependentContext() || 977 D->getLexicalDeclContext()->isDependentContext()) 978 return false; 979 980 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 981 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 982 return false; 983 984 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 985 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 986 return false; 987 } else { 988 // 'static inline' functions are used in headers; don't warn. 989 if (FD->getStorageClass() == SC_Static && 990 FD->isInlineSpecified()) 991 return false; 992 } 993 994 if (FD->doesThisDeclarationHaveABody() && 995 Context.DeclMustBeEmitted(FD)) 996 return false; 997 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 998 if (!VD->isFileVarDecl() || 999 VD->getType().isConstant(Context) || 1000 Context.DeclMustBeEmitted(VD)) 1001 return false; 1002 1003 if (VD->isStaticDataMember() && 1004 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1005 return false; 1006 1007 } else { 1008 return false; 1009 } 1010 1011 // Only warn for unused decls internal to the translation unit. 1012 if (D->getLinkage() == ExternalLinkage) 1013 return false; 1014 1015 return true; 1016} 1017 1018void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1019 if (!D) 1020 return; 1021 1022 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1023 const FunctionDecl *First = FD->getFirstDeclaration(); 1024 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1025 return; // First should already be in the vector. 1026 } 1027 1028 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1029 const VarDecl *First = VD->getFirstDeclaration(); 1030 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1031 return; // First should already be in the vector. 1032 } 1033 1034 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1035 UnusedFileScopedDecls.push_back(D); 1036 } 1037 1038static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1039 if (D->isInvalidDecl()) 1040 return false; 1041 1042 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1043 return false; 1044 1045 if (isa<LabelDecl>(D)) 1046 return true; 1047 1048 // White-list anything that isn't a local variable. 1049 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1050 !D->getDeclContext()->isFunctionOrMethod()) 1051 return false; 1052 1053 // Types of valid local variables should be complete, so this should succeed. 1054 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1055 1056 // White-list anything with an __attribute__((unused)) type. 1057 QualType Ty = VD->getType(); 1058 1059 // Only look at the outermost level of typedef. 1060 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1061 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1062 return false; 1063 } 1064 1065 // If we failed to complete the type for some reason, or if the type is 1066 // dependent, don't diagnose the variable. 1067 if (Ty->isIncompleteType() || Ty->isDependentType()) 1068 return false; 1069 1070 if (const TagType *TT = Ty->getAs<TagType>()) { 1071 const TagDecl *Tag = TT->getDecl(); 1072 if (Tag->hasAttr<UnusedAttr>()) 1073 return false; 1074 1075 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1076 // FIXME: Checking for the presence of a user-declared constructor 1077 // isn't completely accurate; we'd prefer to check that the initializer 1078 // has no side effects. 1079 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1080 return false; 1081 } 1082 } 1083 1084 // TODO: __attribute__((unused)) templates? 1085 } 1086 1087 return true; 1088} 1089 1090static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1091 FixItHint &Hint) { 1092 if (isa<LabelDecl>(D)) { 1093 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1094 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1095 if (AfterColon.isInvalid()) 1096 return; 1097 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1098 getCharRange(D->getLocStart(), AfterColon)); 1099 } 1100 return; 1101} 1102 1103/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1104/// unless they are marked attr(unused). 1105void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1106 FixItHint Hint; 1107 if (!ShouldDiagnoseUnusedDecl(D)) 1108 return; 1109 1110 GenerateFixForUnusedDecl(D, Context, Hint); 1111 1112 unsigned DiagID; 1113 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1114 DiagID = diag::warn_unused_exception_param; 1115 else if (isa<LabelDecl>(D)) 1116 DiagID = diag::warn_unused_label; 1117 else 1118 DiagID = diag::warn_unused_variable; 1119 1120 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1121} 1122 1123static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1124 // Verify that we have no forward references left. If so, there was a goto 1125 // or address of a label taken, but no definition of it. Label fwd 1126 // definitions are indicated with a null substmt. 1127 if (L->getStmt() == 0) 1128 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1129} 1130 1131void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1132 if (S->decl_empty()) return; 1133 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1134 "Scope shouldn't contain decls!"); 1135 1136 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1137 I != E; ++I) { 1138 Decl *TmpD = (*I); 1139 assert(TmpD && "This decl didn't get pushed??"); 1140 1141 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1142 NamedDecl *D = cast<NamedDecl>(TmpD); 1143 1144 if (!D->getDeclName()) continue; 1145 1146 // Diagnose unused variables in this scope. 1147 if (!S->hasErrorOccurred()) 1148 DiagnoseUnusedDecl(D); 1149 1150 // If this was a forward reference to a label, verify it was defined. 1151 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1152 CheckPoppedLabel(LD, *this); 1153 1154 // Remove this name from our lexical scope. 1155 IdResolver.RemoveDecl(D); 1156 } 1157} 1158 1159/// \brief Look for an Objective-C class in the translation unit. 1160/// 1161/// \param Id The name of the Objective-C class we're looking for. If 1162/// typo-correction fixes this name, the Id will be updated 1163/// to the fixed name. 1164/// 1165/// \param IdLoc The location of the name in the translation unit. 1166/// 1167/// \param TypoCorrection If true, this routine will attempt typo correction 1168/// if there is no class with the given name. 1169/// 1170/// \returns The declaration of the named Objective-C class, or NULL if the 1171/// class could not be found. 1172ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1173 SourceLocation IdLoc, 1174 bool DoTypoCorrection) { 1175 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1176 // creation from this context. 1177 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1178 1179 if (!IDecl && DoTypoCorrection) { 1180 // Perform typo correction at the given location, but only if we 1181 // find an Objective-C class name. 1182 TypoCorrection C; 1183 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1184 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1185 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1186 Diag(IdLoc, diag::err_undef_interface_suggest) 1187 << Id << IDecl->getDeclName() 1188 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1189 Diag(IDecl->getLocation(), diag::note_previous_decl) 1190 << IDecl->getDeclName(); 1191 1192 Id = IDecl->getIdentifier(); 1193 } 1194 } 1195 1196 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1197} 1198 1199/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1200/// from S, where a non-field would be declared. This routine copes 1201/// with the difference between C and C++ scoping rules in structs and 1202/// unions. For example, the following code is well-formed in C but 1203/// ill-formed in C++: 1204/// @code 1205/// struct S6 { 1206/// enum { BAR } e; 1207/// }; 1208/// 1209/// void test_S6() { 1210/// struct S6 a; 1211/// a.e = BAR; 1212/// } 1213/// @endcode 1214/// For the declaration of BAR, this routine will return a different 1215/// scope. The scope S will be the scope of the unnamed enumeration 1216/// within S6. In C++, this routine will return the scope associated 1217/// with S6, because the enumeration's scope is a transparent 1218/// context but structures can contain non-field names. In C, this 1219/// routine will return the translation unit scope, since the 1220/// enumeration's scope is a transparent context and structures cannot 1221/// contain non-field names. 1222Scope *Sema::getNonFieldDeclScope(Scope *S) { 1223 while (((S->getFlags() & Scope::DeclScope) == 0) || 1224 (S->getEntity() && 1225 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1226 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1227 S = S->getParent(); 1228 return S; 1229} 1230 1231/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1232/// file scope. lazily create a decl for it. ForRedeclaration is true 1233/// if we're creating this built-in in anticipation of redeclaring the 1234/// built-in. 1235NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1236 Scope *S, bool ForRedeclaration, 1237 SourceLocation Loc) { 1238 Builtin::ID BID = (Builtin::ID)bid; 1239 1240 ASTContext::GetBuiltinTypeError Error; 1241 QualType R = Context.GetBuiltinType(BID, Error); 1242 switch (Error) { 1243 case ASTContext::GE_None: 1244 // Okay 1245 break; 1246 1247 case ASTContext::GE_Missing_stdio: 1248 if (ForRedeclaration) 1249 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1250 << Context.BuiltinInfo.GetName(BID); 1251 return 0; 1252 1253 case ASTContext::GE_Missing_setjmp: 1254 if (ForRedeclaration) 1255 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1256 << Context.BuiltinInfo.GetName(BID); 1257 return 0; 1258 } 1259 1260 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1261 Diag(Loc, diag::ext_implicit_lib_function_decl) 1262 << Context.BuiltinInfo.GetName(BID) 1263 << R; 1264 if (Context.BuiltinInfo.getHeaderName(BID) && 1265 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1266 != Diagnostic::Ignored) 1267 Diag(Loc, diag::note_please_include_header) 1268 << Context.BuiltinInfo.getHeaderName(BID) 1269 << Context.BuiltinInfo.GetName(BID); 1270 } 1271 1272 FunctionDecl *New = FunctionDecl::Create(Context, 1273 Context.getTranslationUnitDecl(), 1274 Loc, Loc, II, R, /*TInfo=*/0, 1275 SC_Extern, 1276 SC_None, false, 1277 /*hasPrototype=*/true); 1278 New->setImplicit(); 1279 1280 // Create Decl objects for each parameter, adding them to the 1281 // FunctionDecl. 1282 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1283 SmallVector<ParmVarDecl*, 16> Params; 1284 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1285 ParmVarDecl *parm = 1286 ParmVarDecl::Create(Context, New, SourceLocation(), 1287 SourceLocation(), 0, 1288 FT->getArgType(i), /*TInfo=*/0, 1289 SC_None, SC_None, 0); 1290 parm->setScopeInfo(0, i); 1291 Params.push_back(parm); 1292 } 1293 New->setParams(Params.data(), Params.size()); 1294 } 1295 1296 AddKnownFunctionAttributes(New); 1297 1298 // TUScope is the translation-unit scope to insert this function into. 1299 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1300 // relate Scopes to DeclContexts, and probably eliminate CurContext 1301 // entirely, but we're not there yet. 1302 DeclContext *SavedContext = CurContext; 1303 CurContext = Context.getTranslationUnitDecl(); 1304 PushOnScopeChains(New, TUScope); 1305 CurContext = SavedContext; 1306 return New; 1307} 1308 1309/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1310/// same name and scope as a previous declaration 'Old'. Figure out 1311/// how to resolve this situation, merging decls or emitting 1312/// diagnostics as appropriate. If there was an error, set New to be invalid. 1313/// 1314void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1315 // If the new decl is known invalid already, don't bother doing any 1316 // merging checks. 1317 if (New->isInvalidDecl()) return; 1318 1319 // Allow multiple definitions for ObjC built-in typedefs. 1320 // FIXME: Verify the underlying types are equivalent! 1321 if (getLangOptions().ObjC1) { 1322 const IdentifierInfo *TypeID = New->getIdentifier(); 1323 switch (TypeID->getLength()) { 1324 default: break; 1325 case 2: 1326 if (!TypeID->isStr("id")) 1327 break; 1328 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1329 // Install the built-in type for 'id', ignoring the current definition. 1330 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1331 return; 1332 case 5: 1333 if (!TypeID->isStr("Class")) 1334 break; 1335 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1336 // Install the built-in type for 'Class', ignoring the current definition. 1337 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1338 return; 1339 case 3: 1340 if (!TypeID->isStr("SEL")) 1341 break; 1342 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1343 // Install the built-in type for 'SEL', ignoring the current definition. 1344 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1345 return; 1346 } 1347 // Fall through - the typedef name was not a builtin type. 1348 } 1349 1350 // Verify the old decl was also a type. 1351 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1352 if (!Old) { 1353 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1354 << New->getDeclName(); 1355 1356 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1357 if (OldD->getLocation().isValid()) 1358 Diag(OldD->getLocation(), diag::note_previous_definition); 1359 1360 return New->setInvalidDecl(); 1361 } 1362 1363 // If the old declaration is invalid, just give up here. 1364 if (Old->isInvalidDecl()) 1365 return New->setInvalidDecl(); 1366 1367 // Determine the "old" type we'll use for checking and diagnostics. 1368 QualType OldType; 1369 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1370 OldType = OldTypedef->getUnderlyingType(); 1371 else 1372 OldType = Context.getTypeDeclType(Old); 1373 1374 // If the typedef types are not identical, reject them in all languages and 1375 // with any extensions enabled. 1376 1377 if (OldType != New->getUnderlyingType() && 1378 Context.getCanonicalType(OldType) != 1379 Context.getCanonicalType(New->getUnderlyingType())) { 1380 int Kind = 0; 1381 if (isa<TypeAliasDecl>(Old)) 1382 Kind = 1; 1383 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1384 << Kind << New->getUnderlyingType() << OldType; 1385 if (Old->getLocation().isValid()) 1386 Diag(Old->getLocation(), diag::note_previous_definition); 1387 return New->setInvalidDecl(); 1388 } 1389 1390 // The types match. Link up the redeclaration chain if the old 1391 // declaration was a typedef. 1392 // FIXME: this is a potential source of weirdness if the type 1393 // spellings don't match exactly. 1394 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1395 New->setPreviousDeclaration(Typedef); 1396 1397 // __module_private__ is propagated to later declarations. 1398 if (Old->isModulePrivate()) 1399 New->setModulePrivate(); 1400 else if (New->isModulePrivate()) 1401 diagnoseModulePrivateRedeclaration(New, Old); 1402 1403 if (getLangOptions().MicrosoftExt) 1404 return; 1405 1406 if (getLangOptions().CPlusPlus) { 1407 // C++ [dcl.typedef]p2: 1408 // In a given non-class scope, a typedef specifier can be used to 1409 // redefine the name of any type declared in that scope to refer 1410 // to the type to which it already refers. 1411 if (!isa<CXXRecordDecl>(CurContext)) 1412 return; 1413 1414 // C++0x [dcl.typedef]p4: 1415 // In a given class scope, a typedef specifier can be used to redefine 1416 // any class-name declared in that scope that is not also a typedef-name 1417 // to refer to the type to which it already refers. 1418 // 1419 // This wording came in via DR424, which was a correction to the 1420 // wording in DR56, which accidentally banned code like: 1421 // 1422 // struct S { 1423 // typedef struct A { } A; 1424 // }; 1425 // 1426 // in the C++03 standard. We implement the C++0x semantics, which 1427 // allow the above but disallow 1428 // 1429 // struct S { 1430 // typedef int I; 1431 // typedef int I; 1432 // }; 1433 // 1434 // since that was the intent of DR56. 1435 if (!isa<TypedefNameDecl>(Old)) 1436 return; 1437 1438 Diag(New->getLocation(), diag::err_redefinition) 1439 << New->getDeclName(); 1440 Diag(Old->getLocation(), diag::note_previous_definition); 1441 return New->setInvalidDecl(); 1442 } 1443 1444 // If we have a redefinition of a typedef in C, emit a warning. This warning 1445 // is normally mapped to an error, but can be controlled with 1446 // -Wtypedef-redefinition. If either the original or the redefinition is 1447 // in a system header, don't emit this for compatibility with GCC. 1448 if (getDiagnostics().getSuppressSystemWarnings() && 1449 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1450 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1451 return; 1452 1453 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1454 << New->getDeclName(); 1455 Diag(Old->getLocation(), diag::note_previous_definition); 1456 return; 1457} 1458 1459/// DeclhasAttr - returns true if decl Declaration already has the target 1460/// attribute. 1461static bool 1462DeclHasAttr(const Decl *D, const Attr *A) { 1463 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1464 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1465 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1466 if ((*i)->getKind() == A->getKind()) { 1467 if (Ann) { 1468 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1469 return true; 1470 continue; 1471 } 1472 // FIXME: Don't hardcode this check 1473 if (OA && isa<OwnershipAttr>(*i)) 1474 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1475 return true; 1476 } 1477 1478 return false; 1479} 1480 1481/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1482static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1483 ASTContext &C, bool mergeDeprecation = true) { 1484 if (!oldDecl->hasAttrs()) 1485 return; 1486 1487 bool foundAny = newDecl->hasAttrs(); 1488 1489 // Ensure that any moving of objects within the allocated map is done before 1490 // we process them. 1491 if (!foundAny) newDecl->setAttrs(AttrVec()); 1492 1493 for (specific_attr_iterator<InheritableAttr> 1494 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1495 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1496 // Ignore deprecated and unavailable attributes if requested. 1497 if (!mergeDeprecation && 1498 (isa<DeprecatedAttr>(*i) || isa<UnavailableAttr>(*i))) 1499 continue; 1500 1501 if (!DeclHasAttr(newDecl, *i)) { 1502 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1503 newAttr->setInherited(true); 1504 newDecl->addAttr(newAttr); 1505 foundAny = true; 1506 } 1507 } 1508 1509 if (!foundAny) newDecl->dropAttrs(); 1510} 1511 1512/// mergeParamDeclAttributes - Copy attributes from the old parameter 1513/// to the new one. 1514static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1515 const ParmVarDecl *oldDecl, 1516 ASTContext &C) { 1517 if (!oldDecl->hasAttrs()) 1518 return; 1519 1520 bool foundAny = newDecl->hasAttrs(); 1521 1522 // Ensure that any moving of objects within the allocated map is 1523 // done before we process them. 1524 if (!foundAny) newDecl->setAttrs(AttrVec()); 1525 1526 for (specific_attr_iterator<InheritableParamAttr> 1527 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1528 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1529 if (!DeclHasAttr(newDecl, *i)) { 1530 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1531 newAttr->setInherited(true); 1532 newDecl->addAttr(newAttr); 1533 foundAny = true; 1534 } 1535 } 1536 1537 if (!foundAny) newDecl->dropAttrs(); 1538} 1539 1540namespace { 1541 1542/// Used in MergeFunctionDecl to keep track of function parameters in 1543/// C. 1544struct GNUCompatibleParamWarning { 1545 ParmVarDecl *OldParm; 1546 ParmVarDecl *NewParm; 1547 QualType PromotedType; 1548}; 1549 1550} 1551 1552/// getSpecialMember - get the special member enum for a method. 1553Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1554 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1555 if (Ctor->isDefaultConstructor()) 1556 return Sema::CXXDefaultConstructor; 1557 1558 if (Ctor->isCopyConstructor()) 1559 return Sema::CXXCopyConstructor; 1560 1561 if (Ctor->isMoveConstructor()) 1562 return Sema::CXXMoveConstructor; 1563 } else if (isa<CXXDestructorDecl>(MD)) { 1564 return Sema::CXXDestructor; 1565 } else if (MD->isCopyAssignmentOperator()) { 1566 return Sema::CXXCopyAssignment; 1567 } else if (MD->isMoveAssignmentOperator()) { 1568 return Sema::CXXMoveAssignment; 1569 } 1570 1571 return Sema::CXXInvalid; 1572} 1573 1574/// canRedefineFunction - checks if a function can be redefined. Currently, 1575/// only extern inline functions can be redefined, and even then only in 1576/// GNU89 mode. 1577static bool canRedefineFunction(const FunctionDecl *FD, 1578 const LangOptions& LangOpts) { 1579 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1580 !LangOpts.CPlusPlus && 1581 FD->isInlineSpecified() && 1582 FD->getStorageClass() == SC_Extern); 1583} 1584 1585/// MergeFunctionDecl - We just parsed a function 'New' from 1586/// declarator D which has the same name and scope as a previous 1587/// declaration 'Old'. Figure out how to resolve this situation, 1588/// merging decls or emitting diagnostics as appropriate. 1589/// 1590/// In C++, New and Old must be declarations that are not 1591/// overloaded. Use IsOverload to determine whether New and Old are 1592/// overloaded, and to select the Old declaration that New should be 1593/// merged with. 1594/// 1595/// Returns true if there was an error, false otherwise. 1596bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1597 // Verify the old decl was also a function. 1598 FunctionDecl *Old = 0; 1599 if (FunctionTemplateDecl *OldFunctionTemplate 1600 = dyn_cast<FunctionTemplateDecl>(OldD)) 1601 Old = OldFunctionTemplate->getTemplatedDecl(); 1602 else 1603 Old = dyn_cast<FunctionDecl>(OldD); 1604 if (!Old) { 1605 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1606 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1607 Diag(Shadow->getTargetDecl()->getLocation(), 1608 diag::note_using_decl_target); 1609 Diag(Shadow->getUsingDecl()->getLocation(), 1610 diag::note_using_decl) << 0; 1611 return true; 1612 } 1613 1614 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1615 << New->getDeclName(); 1616 Diag(OldD->getLocation(), diag::note_previous_definition); 1617 return true; 1618 } 1619 1620 // Determine whether the previous declaration was a definition, 1621 // implicit declaration, or a declaration. 1622 diag::kind PrevDiag; 1623 if (Old->isThisDeclarationADefinition()) 1624 PrevDiag = diag::note_previous_definition; 1625 else if (Old->isImplicit()) 1626 PrevDiag = diag::note_previous_implicit_declaration; 1627 else 1628 PrevDiag = diag::note_previous_declaration; 1629 1630 QualType OldQType = Context.getCanonicalType(Old->getType()); 1631 QualType NewQType = Context.getCanonicalType(New->getType()); 1632 1633 // Don't complain about this if we're in GNU89 mode and the old function 1634 // is an extern inline function. 1635 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1636 New->getStorageClass() == SC_Static && 1637 Old->getStorageClass() != SC_Static && 1638 !canRedefineFunction(Old, getLangOptions())) { 1639 if (getLangOptions().MicrosoftExt) { 1640 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1641 Diag(Old->getLocation(), PrevDiag); 1642 } else { 1643 Diag(New->getLocation(), diag::err_static_non_static) << New; 1644 Diag(Old->getLocation(), PrevDiag); 1645 return true; 1646 } 1647 } 1648 1649 // If a function is first declared with a calling convention, but is 1650 // later declared or defined without one, the second decl assumes the 1651 // calling convention of the first. 1652 // 1653 // For the new decl, we have to look at the NON-canonical type to tell the 1654 // difference between a function that really doesn't have a calling 1655 // convention and one that is declared cdecl. That's because in 1656 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1657 // because it is the default calling convention. 1658 // 1659 // Note also that we DO NOT return at this point, because we still have 1660 // other tests to run. 1661 const FunctionType *OldType = cast<FunctionType>(OldQType); 1662 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1663 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1664 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1665 bool RequiresAdjustment = false; 1666 if (OldTypeInfo.getCC() != CC_Default && 1667 NewTypeInfo.getCC() == CC_Default) { 1668 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1669 RequiresAdjustment = true; 1670 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1671 NewTypeInfo.getCC())) { 1672 // Calling conventions really aren't compatible, so complain. 1673 Diag(New->getLocation(), diag::err_cconv_change) 1674 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1675 << (OldTypeInfo.getCC() == CC_Default) 1676 << (OldTypeInfo.getCC() == CC_Default ? "" : 1677 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1678 Diag(Old->getLocation(), diag::note_previous_declaration); 1679 return true; 1680 } 1681 1682 // FIXME: diagnose the other way around? 1683 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1684 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1685 RequiresAdjustment = true; 1686 } 1687 1688 // Merge regparm attribute. 1689 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1690 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1691 if (NewTypeInfo.getHasRegParm()) { 1692 Diag(New->getLocation(), diag::err_regparm_mismatch) 1693 << NewType->getRegParmType() 1694 << OldType->getRegParmType(); 1695 Diag(Old->getLocation(), diag::note_previous_declaration); 1696 return true; 1697 } 1698 1699 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1700 RequiresAdjustment = true; 1701 } 1702 1703 if (RequiresAdjustment) { 1704 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1705 New->setType(QualType(NewType, 0)); 1706 NewQType = Context.getCanonicalType(New->getType()); 1707 } 1708 1709 if (getLangOptions().CPlusPlus) { 1710 // (C++98 13.1p2): 1711 // Certain function declarations cannot be overloaded: 1712 // -- Function declarations that differ only in the return type 1713 // cannot be overloaded. 1714 QualType OldReturnType = OldType->getResultType(); 1715 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1716 QualType ResQT; 1717 if (OldReturnType != NewReturnType) { 1718 if (NewReturnType->isObjCObjectPointerType() 1719 && OldReturnType->isObjCObjectPointerType()) 1720 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1721 if (ResQT.isNull()) { 1722 if (New->isCXXClassMember() && New->isOutOfLine()) 1723 Diag(New->getLocation(), 1724 diag::err_member_def_does_not_match_ret_type) << New; 1725 else 1726 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1727 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1728 return true; 1729 } 1730 else 1731 NewQType = ResQT; 1732 } 1733 1734 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1735 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1736 if (OldMethod && NewMethod) { 1737 // Preserve triviality. 1738 NewMethod->setTrivial(OldMethod->isTrivial()); 1739 1740 // MSVC allows explicit template specialization at class scope: 1741 // 2 CXMethodDecls referring to the same function will be injected. 1742 // We don't want a redeclartion error. 1743 bool IsClassScopeExplicitSpecialization = 1744 OldMethod->isFunctionTemplateSpecialization() && 1745 NewMethod->isFunctionTemplateSpecialization(); 1746 bool isFriend = NewMethod->getFriendObjectKind(); 1747 1748 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1749 !IsClassScopeExplicitSpecialization) { 1750 // -- Member function declarations with the same name and the 1751 // same parameter types cannot be overloaded if any of them 1752 // is a static member function declaration. 1753 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1754 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1755 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1756 return true; 1757 } 1758 1759 // C++ [class.mem]p1: 1760 // [...] A member shall not be declared twice in the 1761 // member-specification, except that a nested class or member 1762 // class template can be declared and then later defined. 1763 unsigned NewDiag; 1764 if (isa<CXXConstructorDecl>(OldMethod)) 1765 NewDiag = diag::err_constructor_redeclared; 1766 else if (isa<CXXDestructorDecl>(NewMethod)) 1767 NewDiag = diag::err_destructor_redeclared; 1768 else if (isa<CXXConversionDecl>(NewMethod)) 1769 NewDiag = diag::err_conv_function_redeclared; 1770 else 1771 NewDiag = diag::err_member_redeclared; 1772 1773 Diag(New->getLocation(), NewDiag); 1774 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1775 1776 // Complain if this is an explicit declaration of a special 1777 // member that was initially declared implicitly. 1778 // 1779 // As an exception, it's okay to befriend such methods in order 1780 // to permit the implicit constructor/destructor/operator calls. 1781 } else if (OldMethod->isImplicit()) { 1782 if (isFriend) { 1783 NewMethod->setImplicit(); 1784 } else { 1785 Diag(NewMethod->getLocation(), 1786 diag::err_definition_of_implicitly_declared_member) 1787 << New << getSpecialMember(OldMethod); 1788 return true; 1789 } 1790 } else if (OldMethod->isExplicitlyDefaulted()) { 1791 Diag(NewMethod->getLocation(), 1792 diag::err_definition_of_explicitly_defaulted_member) 1793 << getSpecialMember(OldMethod); 1794 return true; 1795 } 1796 } 1797 1798 // (C++98 8.3.5p3): 1799 // All declarations for a function shall agree exactly in both the 1800 // return type and the parameter-type-list. 1801 // We also want to respect all the extended bits except noreturn. 1802 1803 // noreturn should now match unless the old type info didn't have it. 1804 QualType OldQTypeForComparison = OldQType; 1805 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1806 assert(OldQType == QualType(OldType, 0)); 1807 const FunctionType *OldTypeForComparison 1808 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1809 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1810 assert(OldQTypeForComparison.isCanonical()); 1811 } 1812 1813 if (OldQTypeForComparison == NewQType) 1814 return MergeCompatibleFunctionDecls(New, Old); 1815 1816 // Fall through for conflicting redeclarations and redefinitions. 1817 } 1818 1819 // C: Function types need to be compatible, not identical. This handles 1820 // duplicate function decls like "void f(int); void f(enum X);" properly. 1821 if (!getLangOptions().CPlusPlus && 1822 Context.typesAreCompatible(OldQType, NewQType)) { 1823 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1824 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1825 const FunctionProtoType *OldProto = 0; 1826 if (isa<FunctionNoProtoType>(NewFuncType) && 1827 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1828 // The old declaration provided a function prototype, but the 1829 // new declaration does not. Merge in the prototype. 1830 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1831 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1832 OldProto->arg_type_end()); 1833 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1834 ParamTypes.data(), ParamTypes.size(), 1835 OldProto->getExtProtoInfo()); 1836 New->setType(NewQType); 1837 New->setHasInheritedPrototype(); 1838 1839 // Synthesize a parameter for each argument type. 1840 SmallVector<ParmVarDecl*, 16> Params; 1841 for (FunctionProtoType::arg_type_iterator 1842 ParamType = OldProto->arg_type_begin(), 1843 ParamEnd = OldProto->arg_type_end(); 1844 ParamType != ParamEnd; ++ParamType) { 1845 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1846 SourceLocation(), 1847 SourceLocation(), 0, 1848 *ParamType, /*TInfo=*/0, 1849 SC_None, SC_None, 1850 0); 1851 Param->setScopeInfo(0, Params.size()); 1852 Param->setImplicit(); 1853 Params.push_back(Param); 1854 } 1855 1856 New->setParams(Params.data(), Params.size()); 1857 } 1858 1859 return MergeCompatibleFunctionDecls(New, Old); 1860 } 1861 1862 // GNU C permits a K&R definition to follow a prototype declaration 1863 // if the declared types of the parameters in the K&R definition 1864 // match the types in the prototype declaration, even when the 1865 // promoted types of the parameters from the K&R definition differ 1866 // from the types in the prototype. GCC then keeps the types from 1867 // the prototype. 1868 // 1869 // If a variadic prototype is followed by a non-variadic K&R definition, 1870 // the K&R definition becomes variadic. This is sort of an edge case, but 1871 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1872 // C99 6.9.1p8. 1873 if (!getLangOptions().CPlusPlus && 1874 Old->hasPrototype() && !New->hasPrototype() && 1875 New->getType()->getAs<FunctionProtoType>() && 1876 Old->getNumParams() == New->getNumParams()) { 1877 SmallVector<QualType, 16> ArgTypes; 1878 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1879 const FunctionProtoType *OldProto 1880 = Old->getType()->getAs<FunctionProtoType>(); 1881 const FunctionProtoType *NewProto 1882 = New->getType()->getAs<FunctionProtoType>(); 1883 1884 // Determine whether this is the GNU C extension. 1885 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1886 NewProto->getResultType()); 1887 bool LooseCompatible = !MergedReturn.isNull(); 1888 for (unsigned Idx = 0, End = Old->getNumParams(); 1889 LooseCompatible && Idx != End; ++Idx) { 1890 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1891 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1892 if (Context.typesAreCompatible(OldParm->getType(), 1893 NewProto->getArgType(Idx))) { 1894 ArgTypes.push_back(NewParm->getType()); 1895 } else if (Context.typesAreCompatible(OldParm->getType(), 1896 NewParm->getType(), 1897 /*CompareUnqualified=*/true)) { 1898 GNUCompatibleParamWarning Warn 1899 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1900 Warnings.push_back(Warn); 1901 ArgTypes.push_back(NewParm->getType()); 1902 } else 1903 LooseCompatible = false; 1904 } 1905 1906 if (LooseCompatible) { 1907 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1908 Diag(Warnings[Warn].NewParm->getLocation(), 1909 diag::ext_param_promoted_not_compatible_with_prototype) 1910 << Warnings[Warn].PromotedType 1911 << Warnings[Warn].OldParm->getType(); 1912 if (Warnings[Warn].OldParm->getLocation().isValid()) 1913 Diag(Warnings[Warn].OldParm->getLocation(), 1914 diag::note_previous_declaration); 1915 } 1916 1917 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1918 ArgTypes.size(), 1919 OldProto->getExtProtoInfo())); 1920 return MergeCompatibleFunctionDecls(New, Old); 1921 } 1922 1923 // Fall through to diagnose conflicting types. 1924 } 1925 1926 // A function that has already been declared has been redeclared or defined 1927 // with a different type- show appropriate diagnostic 1928 if (unsigned BuiltinID = Old->getBuiltinID()) { 1929 // The user has declared a builtin function with an incompatible 1930 // signature. 1931 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1932 // The function the user is redeclaring is a library-defined 1933 // function like 'malloc' or 'printf'. Warn about the 1934 // redeclaration, then pretend that we don't know about this 1935 // library built-in. 1936 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1937 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1938 << Old << Old->getType(); 1939 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1940 Old->setInvalidDecl(); 1941 return false; 1942 } 1943 1944 PrevDiag = diag::note_previous_builtin_declaration; 1945 } 1946 1947 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1948 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1949 return true; 1950} 1951 1952/// \brief Completes the merge of two function declarations that are 1953/// known to be compatible. 1954/// 1955/// This routine handles the merging of attributes and other 1956/// properties of function declarations form the old declaration to 1957/// the new declaration, once we know that New is in fact a 1958/// redeclaration of Old. 1959/// 1960/// \returns false 1961bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1962 // Merge the attributes 1963 mergeDeclAttributes(New, Old, Context); 1964 1965 // Merge the storage class. 1966 if (Old->getStorageClass() != SC_Extern && 1967 Old->getStorageClass() != SC_None) 1968 New->setStorageClass(Old->getStorageClass()); 1969 1970 // Merge "pure" flag. 1971 if (Old->isPure()) 1972 New->setPure(); 1973 1974 // __module_private__ is propagated to later declarations. 1975 if (Old->isModulePrivate()) 1976 New->setModulePrivate(); 1977 else if (New->isModulePrivate()) 1978 diagnoseModulePrivateRedeclaration(New, Old); 1979 1980 // Merge attributes from the parameters. These can mismatch with K&R 1981 // declarations. 1982 if (New->getNumParams() == Old->getNumParams()) 1983 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 1984 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 1985 Context); 1986 1987 if (getLangOptions().CPlusPlus) 1988 return MergeCXXFunctionDecl(New, Old); 1989 1990 return false; 1991} 1992 1993 1994void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 1995 const ObjCMethodDecl *oldMethod) { 1996 // We don't want to merge unavailable and deprecated attributes 1997 // except from interface to implementation. 1998 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 1999 2000 // Merge the attributes. 2001 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation); 2002 2003 // Merge attributes from the parameters. 2004 for (ObjCMethodDecl::param_iterator oi = oldMethod->param_begin(), 2005 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2006 ni != ne; ++ni, ++oi) 2007 mergeParamDeclAttributes(*ni, *oi, Context); 2008 2009 CheckObjCMethodOverride(newMethod, oldMethod, true); 2010} 2011 2012/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2013/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2014/// emitting diagnostics as appropriate. 2015/// 2016/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2017/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2018/// check them before the initializer is attached. 2019/// 2020void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2021 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2022 return; 2023 2024 QualType MergedT; 2025 if (getLangOptions().CPlusPlus) { 2026 AutoType *AT = New->getType()->getContainedAutoType(); 2027 if (AT && !AT->isDeduced()) { 2028 // We don't know what the new type is until the initializer is attached. 2029 return; 2030 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2031 // These could still be something that needs exception specs checked. 2032 return MergeVarDeclExceptionSpecs(New, Old); 2033 } 2034 // C++ [basic.link]p10: 2035 // [...] the types specified by all declarations referring to a given 2036 // object or function shall be identical, except that declarations for an 2037 // array object can specify array types that differ by the presence or 2038 // absence of a major array bound (8.3.4). 2039 else if (Old->getType()->isIncompleteArrayType() && 2040 New->getType()->isArrayType()) { 2041 CanQual<ArrayType> OldArray 2042 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2043 CanQual<ArrayType> NewArray 2044 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2045 if (OldArray->getElementType() == NewArray->getElementType()) 2046 MergedT = New->getType(); 2047 } else if (Old->getType()->isArrayType() && 2048 New->getType()->isIncompleteArrayType()) { 2049 CanQual<ArrayType> OldArray 2050 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2051 CanQual<ArrayType> NewArray 2052 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2053 if (OldArray->getElementType() == NewArray->getElementType()) 2054 MergedT = Old->getType(); 2055 } else if (New->getType()->isObjCObjectPointerType() 2056 && Old->getType()->isObjCObjectPointerType()) { 2057 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2058 Old->getType()); 2059 } 2060 } else { 2061 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2062 } 2063 if (MergedT.isNull()) { 2064 Diag(New->getLocation(), diag::err_redefinition_different_type) 2065 << New->getDeclName(); 2066 Diag(Old->getLocation(), diag::note_previous_definition); 2067 return New->setInvalidDecl(); 2068 } 2069 New->setType(MergedT); 2070} 2071 2072/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2073/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2074/// situation, merging decls or emitting diagnostics as appropriate. 2075/// 2076/// Tentative definition rules (C99 6.9.2p2) are checked by 2077/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2078/// definitions here, since the initializer hasn't been attached. 2079/// 2080void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2081 // If the new decl is already invalid, don't do any other checking. 2082 if (New->isInvalidDecl()) 2083 return; 2084 2085 // Verify the old decl was also a variable. 2086 VarDecl *Old = 0; 2087 if (!Previous.isSingleResult() || 2088 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2089 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2090 << New->getDeclName(); 2091 Diag(Previous.getRepresentativeDecl()->getLocation(), 2092 diag::note_previous_definition); 2093 return New->setInvalidDecl(); 2094 } 2095 2096 // C++ [class.mem]p1: 2097 // A member shall not be declared twice in the member-specification [...] 2098 // 2099 // Here, we need only consider static data members. 2100 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2101 Diag(New->getLocation(), diag::err_duplicate_member) 2102 << New->getIdentifier(); 2103 Diag(Old->getLocation(), diag::note_previous_declaration); 2104 New->setInvalidDecl(); 2105 } 2106 2107 mergeDeclAttributes(New, Old, Context); 2108 // Warn if an already-declared variable is made a weak_import in a subsequent declaration 2109 if (New->getAttr<WeakImportAttr>() && 2110 Old->getStorageClass() == SC_None && 2111 !Old->getAttr<WeakImportAttr>()) { 2112 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2113 Diag(Old->getLocation(), diag::note_previous_definition); 2114 // Remove weak_import attribute on new declaration. 2115 New->dropAttr<WeakImportAttr>(); 2116 } 2117 2118 // Merge the types. 2119 MergeVarDeclTypes(New, Old); 2120 if (New->isInvalidDecl()) 2121 return; 2122 2123 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2124 if (New->getStorageClass() == SC_Static && 2125 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2126 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2127 Diag(Old->getLocation(), diag::note_previous_definition); 2128 return New->setInvalidDecl(); 2129 } 2130 // C99 6.2.2p4: 2131 // For an identifier declared with the storage-class specifier 2132 // extern in a scope in which a prior declaration of that 2133 // identifier is visible,23) if the prior declaration specifies 2134 // internal or external linkage, the linkage of the identifier at 2135 // the later declaration is the same as the linkage specified at 2136 // the prior declaration. If no prior declaration is visible, or 2137 // if the prior declaration specifies no linkage, then the 2138 // identifier has external linkage. 2139 if (New->hasExternalStorage() && Old->hasLinkage()) 2140 /* Okay */; 2141 else if (New->getStorageClass() != SC_Static && 2142 Old->getStorageClass() == SC_Static) { 2143 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2144 Diag(Old->getLocation(), diag::note_previous_definition); 2145 return New->setInvalidDecl(); 2146 } 2147 2148 // Check if extern is followed by non-extern and vice-versa. 2149 if (New->hasExternalStorage() && 2150 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2151 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2152 Diag(Old->getLocation(), diag::note_previous_definition); 2153 return New->setInvalidDecl(); 2154 } 2155 if (Old->hasExternalStorage() && 2156 !New->hasLinkage() && New->isLocalVarDecl()) { 2157 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2158 Diag(Old->getLocation(), diag::note_previous_definition); 2159 return New->setInvalidDecl(); 2160 } 2161 2162 // __module_private__ is propagated to later declarations. 2163 if (Old->isModulePrivate()) 2164 New->setModulePrivate(); 2165 else if (New->isModulePrivate()) 2166 diagnoseModulePrivateRedeclaration(New, Old); 2167 2168 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2169 2170 // FIXME: The test for external storage here seems wrong? We still 2171 // need to check for mismatches. 2172 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2173 // Don't complain about out-of-line definitions of static members. 2174 !(Old->getLexicalDeclContext()->isRecord() && 2175 !New->getLexicalDeclContext()->isRecord())) { 2176 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2177 Diag(Old->getLocation(), diag::note_previous_definition); 2178 return New->setInvalidDecl(); 2179 } 2180 2181 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2182 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2183 Diag(Old->getLocation(), diag::note_previous_definition); 2184 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2185 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2186 Diag(Old->getLocation(), diag::note_previous_definition); 2187 } 2188 2189 // C++ doesn't have tentative definitions, so go right ahead and check here. 2190 const VarDecl *Def; 2191 if (getLangOptions().CPlusPlus && 2192 New->isThisDeclarationADefinition() == VarDecl::Definition && 2193 (Def = Old->getDefinition())) { 2194 Diag(New->getLocation(), diag::err_redefinition) 2195 << New->getDeclName(); 2196 Diag(Def->getLocation(), diag::note_previous_definition); 2197 New->setInvalidDecl(); 2198 return; 2199 } 2200 // c99 6.2.2 P4. 2201 // For an identifier declared with the storage-class specifier extern in a 2202 // scope in which a prior declaration of that identifier is visible, if 2203 // the prior declaration specifies internal or external linkage, the linkage 2204 // of the identifier at the later declaration is the same as the linkage 2205 // specified at the prior declaration. 2206 // FIXME. revisit this code. 2207 if (New->hasExternalStorage() && 2208 Old->getLinkage() == InternalLinkage && 2209 New->getDeclContext() == Old->getDeclContext()) 2210 New->setStorageClass(Old->getStorageClass()); 2211 2212 // Keep a chain of previous declarations. 2213 New->setPreviousDeclaration(Old); 2214 2215 // Inherit access appropriately. 2216 New->setAccess(Old->getAccess()); 2217} 2218 2219/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2220/// no declarator (e.g. "struct foo;") is parsed. 2221Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2222 DeclSpec &DS) { 2223 return ParsedFreeStandingDeclSpec(S, AS, DS, 2224 MultiTemplateParamsArg(*this, 0, 0)); 2225} 2226 2227/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2228/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2229/// parameters to cope with template friend declarations. 2230Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2231 DeclSpec &DS, 2232 MultiTemplateParamsArg TemplateParams) { 2233 Decl *TagD = 0; 2234 TagDecl *Tag = 0; 2235 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2236 DS.getTypeSpecType() == DeclSpec::TST_struct || 2237 DS.getTypeSpecType() == DeclSpec::TST_union || 2238 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2239 TagD = DS.getRepAsDecl(); 2240 2241 if (!TagD) // We probably had an error 2242 return 0; 2243 2244 // Note that the above type specs guarantee that the 2245 // type rep is a Decl, whereas in many of the others 2246 // it's a Type. 2247 Tag = dyn_cast<TagDecl>(TagD); 2248 } 2249 2250 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2251 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2252 // or incomplete types shall not be restrict-qualified." 2253 if (TypeQuals & DeclSpec::TQ_restrict) 2254 Diag(DS.getRestrictSpecLoc(), 2255 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2256 << DS.getSourceRange(); 2257 } 2258 2259 if (DS.isConstexprSpecified()) { 2260 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2261 // and definitions of functions and variables. 2262 if (Tag) 2263 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2264 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2265 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2266 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2267 else 2268 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2269 // Don't emit warnings after this error. 2270 return TagD; 2271 } 2272 2273 if (DS.isFriendSpecified()) { 2274 // If we're dealing with a decl but not a TagDecl, assume that 2275 // whatever routines created it handled the friendship aspect. 2276 if (TagD && !Tag) 2277 return 0; 2278 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2279 } 2280 2281 // Track whether we warned about the fact that there aren't any 2282 // declarators. 2283 bool emittedWarning = false; 2284 2285 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2286 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2287 2288 if (!Record->getDeclName() && Record->isDefinition() && 2289 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2290 if (getLangOptions().CPlusPlus || 2291 Record->getDeclContext()->isRecord()) 2292 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2293 2294 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2295 << DS.getSourceRange(); 2296 emittedWarning = true; 2297 } 2298 } 2299 2300 // Check for Microsoft C extension: anonymous struct. 2301 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2302 CurContext->isRecord() && 2303 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2304 // Handle 2 kinds of anonymous struct: 2305 // struct STRUCT; 2306 // and 2307 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2308 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2309 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 2310 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2311 DS.getRepAsType().get()->isStructureType())) { 2312 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2313 << DS.getSourceRange(); 2314 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2315 } 2316 } 2317 2318 if (getLangOptions().CPlusPlus && 2319 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2320 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2321 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2322 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2323 Diag(Enum->getLocation(), diag::ext_no_declarators) 2324 << DS.getSourceRange(); 2325 emittedWarning = true; 2326 } 2327 2328 // Skip all the checks below if we have a type error. 2329 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2330 2331 if (!DS.isMissingDeclaratorOk()) { 2332 // Warn about typedefs of enums without names, since this is an 2333 // extension in both Microsoft and GNU. 2334 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2335 Tag && isa<EnumDecl>(Tag)) { 2336 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2337 << DS.getSourceRange(); 2338 return Tag; 2339 } 2340 2341 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2342 << DS.getSourceRange(); 2343 emittedWarning = true; 2344 } 2345 2346 // We're going to complain about a bunch of spurious specifiers; 2347 // only do this if we're declaring a tag, because otherwise we 2348 // should be getting diag::ext_no_declarators. 2349 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2350 return TagD; 2351 2352 // Note that a linkage-specification sets a storage class, but 2353 // 'extern "C" struct foo;' is actually valid and not theoretically 2354 // useless. 2355 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2356 if (!DS.isExternInLinkageSpec()) 2357 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2358 << DeclSpec::getSpecifierName(scs); 2359 2360 if (DS.isThreadSpecified()) 2361 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2362 if (DS.getTypeQualifiers()) { 2363 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2364 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2365 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2366 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2367 // Restrict is covered above. 2368 } 2369 if (DS.isInlineSpecified()) 2370 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2371 if (DS.isVirtualSpecified()) 2372 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2373 if (DS.isExplicitSpecified()) 2374 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2375 2376 if (DS.isModulePrivateSpecified() && 2377 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2378 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2379 << Tag->getTagKind() 2380 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2381 2382 // FIXME: Warn on useless attributes 2383 2384 return TagD; 2385} 2386 2387/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2388/// builds a statement for it and returns it so it is evaluated. 2389StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2390 StmtResult R; 2391 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2392 Expr *Exp = DS.getRepAsExpr(); 2393 QualType Ty = Exp->getType(); 2394 if (Ty->isPointerType()) { 2395 do 2396 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2397 while (Ty->isPointerType()); 2398 } 2399 if (Ty->isVariableArrayType()) { 2400 R = ActOnExprStmt(MakeFullExpr(Exp)); 2401 } 2402 } 2403 return R; 2404} 2405 2406/// We are trying to inject an anonymous member into the given scope; 2407/// check if there's an existing declaration that can't be overloaded. 2408/// 2409/// \return true if this is a forbidden redeclaration 2410static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2411 Scope *S, 2412 DeclContext *Owner, 2413 DeclarationName Name, 2414 SourceLocation NameLoc, 2415 unsigned diagnostic) { 2416 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2417 Sema::ForRedeclaration); 2418 if (!SemaRef.LookupName(R, S)) return false; 2419 2420 if (R.getAsSingle<TagDecl>()) 2421 return false; 2422 2423 // Pick a representative declaration. 2424 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2425 assert(PrevDecl && "Expected a non-null Decl"); 2426 2427 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2428 return false; 2429 2430 SemaRef.Diag(NameLoc, diagnostic) << Name; 2431 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2432 2433 return true; 2434} 2435 2436/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2437/// anonymous struct or union AnonRecord into the owning context Owner 2438/// and scope S. This routine will be invoked just after we realize 2439/// that an unnamed union or struct is actually an anonymous union or 2440/// struct, e.g., 2441/// 2442/// @code 2443/// union { 2444/// int i; 2445/// float f; 2446/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2447/// // f into the surrounding scope.x 2448/// @endcode 2449/// 2450/// This routine is recursive, injecting the names of nested anonymous 2451/// structs/unions into the owning context and scope as well. 2452static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2453 DeclContext *Owner, 2454 RecordDecl *AnonRecord, 2455 AccessSpecifier AS, 2456 SmallVector<NamedDecl*, 2> &Chaining, 2457 bool MSAnonStruct) { 2458 unsigned diagKind 2459 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2460 : diag::err_anonymous_struct_member_redecl; 2461 2462 bool Invalid = false; 2463 2464 // Look every FieldDecl and IndirectFieldDecl with a name. 2465 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2466 DEnd = AnonRecord->decls_end(); 2467 D != DEnd; ++D) { 2468 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2469 cast<NamedDecl>(*D)->getDeclName()) { 2470 ValueDecl *VD = cast<ValueDecl>(*D); 2471 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2472 VD->getLocation(), diagKind)) { 2473 // C++ [class.union]p2: 2474 // The names of the members of an anonymous union shall be 2475 // distinct from the names of any other entity in the 2476 // scope in which the anonymous union is declared. 2477 Invalid = true; 2478 } else { 2479 // C++ [class.union]p2: 2480 // For the purpose of name lookup, after the anonymous union 2481 // definition, the members of the anonymous union are 2482 // considered to have been defined in the scope in which the 2483 // anonymous union is declared. 2484 unsigned OldChainingSize = Chaining.size(); 2485 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2486 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2487 PE = IF->chain_end(); PI != PE; ++PI) 2488 Chaining.push_back(*PI); 2489 else 2490 Chaining.push_back(VD); 2491 2492 assert(Chaining.size() >= 2); 2493 NamedDecl **NamedChain = 2494 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2495 for (unsigned i = 0; i < Chaining.size(); i++) 2496 NamedChain[i] = Chaining[i]; 2497 2498 IndirectFieldDecl* IndirectField = 2499 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2500 VD->getIdentifier(), VD->getType(), 2501 NamedChain, Chaining.size()); 2502 2503 IndirectField->setAccess(AS); 2504 IndirectField->setImplicit(); 2505 SemaRef.PushOnScopeChains(IndirectField, S); 2506 2507 // That includes picking up the appropriate access specifier. 2508 if (AS != AS_none) IndirectField->setAccess(AS); 2509 2510 Chaining.resize(OldChainingSize); 2511 } 2512 } 2513 } 2514 2515 return Invalid; 2516} 2517 2518/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2519/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2520/// illegal input values are mapped to SC_None. 2521static StorageClass 2522StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2523 switch (StorageClassSpec) { 2524 case DeclSpec::SCS_unspecified: return SC_None; 2525 case DeclSpec::SCS_extern: return SC_Extern; 2526 case DeclSpec::SCS_static: return SC_Static; 2527 case DeclSpec::SCS_auto: return SC_Auto; 2528 case DeclSpec::SCS_register: return SC_Register; 2529 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2530 // Illegal SCSs map to None: error reporting is up to the caller. 2531 case DeclSpec::SCS_mutable: // Fall through. 2532 case DeclSpec::SCS_typedef: return SC_None; 2533 } 2534 llvm_unreachable("unknown storage class specifier"); 2535} 2536 2537/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2538/// a StorageClass. Any error reporting is up to the caller: 2539/// illegal input values are mapped to SC_None. 2540static StorageClass 2541StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2542 switch (StorageClassSpec) { 2543 case DeclSpec::SCS_unspecified: return SC_None; 2544 case DeclSpec::SCS_extern: return SC_Extern; 2545 case DeclSpec::SCS_static: return SC_Static; 2546 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2547 // Illegal SCSs map to None: error reporting is up to the caller. 2548 case DeclSpec::SCS_auto: // Fall through. 2549 case DeclSpec::SCS_mutable: // Fall through. 2550 case DeclSpec::SCS_register: // Fall through. 2551 case DeclSpec::SCS_typedef: return SC_None; 2552 } 2553 llvm_unreachable("unknown storage class specifier"); 2554} 2555 2556/// BuildAnonymousStructOrUnion - Handle the declaration of an 2557/// anonymous structure or union. Anonymous unions are a C++ feature 2558/// (C++ [class.union]) and a GNU C extension; anonymous structures 2559/// are a GNU C and GNU C++ extension. 2560Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2561 AccessSpecifier AS, 2562 RecordDecl *Record) { 2563 DeclContext *Owner = Record->getDeclContext(); 2564 2565 // Diagnose whether this anonymous struct/union is an extension. 2566 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2567 Diag(Record->getLocation(), diag::ext_anonymous_union); 2568 else if (!Record->isUnion()) 2569 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2570 2571 // C and C++ require different kinds of checks for anonymous 2572 // structs/unions. 2573 bool Invalid = false; 2574 if (getLangOptions().CPlusPlus) { 2575 const char* PrevSpec = 0; 2576 unsigned DiagID; 2577 // C++ [class.union]p3: 2578 // Anonymous unions declared in a named namespace or in the 2579 // global namespace shall be declared static. 2580 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2581 (isa<TranslationUnitDecl>(Owner) || 2582 (isa<NamespaceDecl>(Owner) && 2583 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2584 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2585 Invalid = true; 2586 2587 // Recover by adding 'static'. 2588 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 2589 PrevSpec, DiagID, getLangOptions()); 2590 } 2591 // C++ [class.union]p3: 2592 // A storage class is not allowed in a declaration of an 2593 // anonymous union in a class scope. 2594 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2595 isa<RecordDecl>(Owner)) { 2596 Diag(DS.getStorageClassSpecLoc(), 2597 diag::err_anonymous_union_with_storage_spec); 2598 Invalid = true; 2599 2600 // Recover by removing the storage specifier. 2601 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 2602 PrevSpec, DiagID, getLangOptions()); 2603 } 2604 2605 // Ignore const/volatile/restrict qualifiers. 2606 if (DS.getTypeQualifiers()) { 2607 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2608 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2609 << Record->isUnion() << 0 2610 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2611 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2612 Diag(DS.getVolatileSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2613 << Record->isUnion() << 1 2614 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2615 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2616 Diag(DS.getRestrictSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2617 << Record->isUnion() << 2 2618 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2619 2620 DS.ClearTypeQualifiers(); 2621 } 2622 2623 // C++ [class.union]p2: 2624 // The member-specification of an anonymous union shall only 2625 // define non-static data members. [Note: nested types and 2626 // functions cannot be declared within an anonymous union. ] 2627 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2628 MemEnd = Record->decls_end(); 2629 Mem != MemEnd; ++Mem) { 2630 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2631 // C++ [class.union]p3: 2632 // An anonymous union shall not have private or protected 2633 // members (clause 11). 2634 assert(FD->getAccess() != AS_none); 2635 if (FD->getAccess() != AS_public) { 2636 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2637 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2638 Invalid = true; 2639 } 2640 2641 // C++ [class.union]p1 2642 // An object of a class with a non-trivial constructor, a non-trivial 2643 // copy constructor, a non-trivial destructor, or a non-trivial copy 2644 // assignment operator cannot be a member of a union, nor can an 2645 // array of such objects. 2646 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(FD)) 2647 Invalid = true; 2648 } else if ((*Mem)->isImplicit()) { 2649 // Any implicit members are fine. 2650 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2651 // This is a type that showed up in an 2652 // elaborated-type-specifier inside the anonymous struct or 2653 // union, but which actually declares a type outside of the 2654 // anonymous struct or union. It's okay. 2655 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2656 if (!MemRecord->isAnonymousStructOrUnion() && 2657 MemRecord->getDeclName()) { 2658 // Visual C++ allows type definition in anonymous struct or union. 2659 if (getLangOptions().MicrosoftExt) 2660 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2661 << (int)Record->isUnion(); 2662 else { 2663 // This is a nested type declaration. 2664 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2665 << (int)Record->isUnion(); 2666 Invalid = true; 2667 } 2668 } 2669 } else if (isa<AccessSpecDecl>(*Mem)) { 2670 // Any access specifier is fine. 2671 } else { 2672 // We have something that isn't a non-static data 2673 // member. Complain about it. 2674 unsigned DK = diag::err_anonymous_record_bad_member; 2675 if (isa<TypeDecl>(*Mem)) 2676 DK = diag::err_anonymous_record_with_type; 2677 else if (isa<FunctionDecl>(*Mem)) 2678 DK = diag::err_anonymous_record_with_function; 2679 else if (isa<VarDecl>(*Mem)) 2680 DK = diag::err_anonymous_record_with_static; 2681 2682 // Visual C++ allows type definition in anonymous struct or union. 2683 if (getLangOptions().MicrosoftExt && 2684 DK == diag::err_anonymous_record_with_type) 2685 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2686 << (int)Record->isUnion(); 2687 else { 2688 Diag((*Mem)->getLocation(), DK) 2689 << (int)Record->isUnion(); 2690 Invalid = true; 2691 } 2692 } 2693 } 2694 } 2695 2696 if (!Record->isUnion() && !Owner->isRecord()) { 2697 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2698 << (int)getLangOptions().CPlusPlus; 2699 Invalid = true; 2700 } 2701 2702 // Mock up a declarator. 2703 Declarator Dc(DS, Declarator::MemberContext); 2704 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2705 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2706 2707 // Create a declaration for this anonymous struct/union. 2708 NamedDecl *Anon = 0; 2709 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2710 Anon = FieldDecl::Create(Context, OwningClass, 2711 DS.getSourceRange().getBegin(), 2712 Record->getLocation(), 2713 /*IdentifierInfo=*/0, 2714 Context.getTypeDeclType(Record), 2715 TInfo, 2716 /*BitWidth=*/0, /*Mutable=*/false, 2717 /*HasInit=*/false); 2718 Anon->setAccess(AS); 2719 if (getLangOptions().CPlusPlus) 2720 FieldCollector->Add(cast<FieldDecl>(Anon)); 2721 } else { 2722 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2723 assert(SCSpec != DeclSpec::SCS_typedef && 2724 "Parser allowed 'typedef' as storage class VarDecl."); 2725 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2726 if (SCSpec == DeclSpec::SCS_mutable) { 2727 // mutable can only appear on non-static class members, so it's always 2728 // an error here 2729 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2730 Invalid = true; 2731 SC = SC_None; 2732 } 2733 SCSpec = DS.getStorageClassSpecAsWritten(); 2734 VarDecl::StorageClass SCAsWritten 2735 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2736 2737 Anon = VarDecl::Create(Context, Owner, 2738 DS.getSourceRange().getBegin(), 2739 Record->getLocation(), /*IdentifierInfo=*/0, 2740 Context.getTypeDeclType(Record), 2741 TInfo, SC, SCAsWritten); 2742 2743 // Default-initialize the implicit variable. This initialization will be 2744 // trivial in almost all cases, except if a union member has an in-class 2745 // initializer: 2746 // union { int n = 0; }; 2747 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2748 } 2749 Anon->setImplicit(); 2750 2751 // Add the anonymous struct/union object to the current 2752 // context. We'll be referencing this object when we refer to one of 2753 // its members. 2754 Owner->addDecl(Anon); 2755 2756 // Inject the members of the anonymous struct/union into the owning 2757 // context and into the identifier resolver chain for name lookup 2758 // purposes. 2759 SmallVector<NamedDecl*, 2> Chain; 2760 Chain.push_back(Anon); 2761 2762 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2763 Chain, false)) 2764 Invalid = true; 2765 2766 // Mark this as an anonymous struct/union type. Note that we do not 2767 // do this until after we have already checked and injected the 2768 // members of this anonymous struct/union type, because otherwise 2769 // the members could be injected twice: once by DeclContext when it 2770 // builds its lookup table, and once by 2771 // InjectAnonymousStructOrUnionMembers. 2772 Record->setAnonymousStructOrUnion(true); 2773 2774 if (Invalid) 2775 Anon->setInvalidDecl(); 2776 2777 return Anon; 2778} 2779 2780/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2781/// Microsoft C anonymous structure. 2782/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2783/// Example: 2784/// 2785/// struct A { int a; }; 2786/// struct B { struct A; int b; }; 2787/// 2788/// void foo() { 2789/// B var; 2790/// var.a = 3; 2791/// } 2792/// 2793Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2794 RecordDecl *Record) { 2795 2796 // If there is no Record, get the record via the typedef. 2797 if (!Record) 2798 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2799 2800 // Mock up a declarator. 2801 Declarator Dc(DS, Declarator::TypeNameContext); 2802 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2803 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2804 2805 // Create a declaration for this anonymous struct. 2806 NamedDecl* Anon = FieldDecl::Create(Context, 2807 cast<RecordDecl>(CurContext), 2808 DS.getSourceRange().getBegin(), 2809 DS.getSourceRange().getBegin(), 2810 /*IdentifierInfo=*/0, 2811 Context.getTypeDeclType(Record), 2812 TInfo, 2813 /*BitWidth=*/0, /*Mutable=*/false, 2814 /*HasInit=*/false); 2815 Anon->setImplicit(); 2816 2817 // Add the anonymous struct object to the current context. 2818 CurContext->addDecl(Anon); 2819 2820 // Inject the members of the anonymous struct into the current 2821 // context and into the identifier resolver chain for name lookup 2822 // purposes. 2823 SmallVector<NamedDecl*, 2> Chain; 2824 Chain.push_back(Anon); 2825 2826 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2827 Record->getDefinition(), 2828 AS_none, Chain, true)) 2829 Anon->setInvalidDecl(); 2830 2831 return Anon; 2832} 2833 2834/// GetNameForDeclarator - Determine the full declaration name for the 2835/// given Declarator. 2836DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2837 return GetNameFromUnqualifiedId(D.getName()); 2838} 2839 2840/// \brief Retrieves the declaration name from a parsed unqualified-id. 2841DeclarationNameInfo 2842Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2843 DeclarationNameInfo NameInfo; 2844 NameInfo.setLoc(Name.StartLocation); 2845 2846 switch (Name.getKind()) { 2847 2848 case UnqualifiedId::IK_ImplicitSelfParam: 2849 case UnqualifiedId::IK_Identifier: 2850 NameInfo.setName(Name.Identifier); 2851 NameInfo.setLoc(Name.StartLocation); 2852 return NameInfo; 2853 2854 case UnqualifiedId::IK_OperatorFunctionId: 2855 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2856 Name.OperatorFunctionId.Operator)); 2857 NameInfo.setLoc(Name.StartLocation); 2858 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2859 = Name.OperatorFunctionId.SymbolLocations[0]; 2860 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2861 = Name.EndLocation.getRawEncoding(); 2862 return NameInfo; 2863 2864 case UnqualifiedId::IK_LiteralOperatorId: 2865 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2866 Name.Identifier)); 2867 NameInfo.setLoc(Name.StartLocation); 2868 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2869 return NameInfo; 2870 2871 case UnqualifiedId::IK_ConversionFunctionId: { 2872 TypeSourceInfo *TInfo; 2873 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2874 if (Ty.isNull()) 2875 return DeclarationNameInfo(); 2876 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2877 Context.getCanonicalType(Ty))); 2878 NameInfo.setLoc(Name.StartLocation); 2879 NameInfo.setNamedTypeInfo(TInfo); 2880 return NameInfo; 2881 } 2882 2883 case UnqualifiedId::IK_ConstructorName: { 2884 TypeSourceInfo *TInfo; 2885 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2886 if (Ty.isNull()) 2887 return DeclarationNameInfo(); 2888 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2889 Context.getCanonicalType(Ty))); 2890 NameInfo.setLoc(Name.StartLocation); 2891 NameInfo.setNamedTypeInfo(TInfo); 2892 return NameInfo; 2893 } 2894 2895 case UnqualifiedId::IK_ConstructorTemplateId: { 2896 // In well-formed code, we can only have a constructor 2897 // template-id that refers to the current context, so go there 2898 // to find the actual type being constructed. 2899 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2900 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2901 return DeclarationNameInfo(); 2902 2903 // Determine the type of the class being constructed. 2904 QualType CurClassType = Context.getTypeDeclType(CurClass); 2905 2906 // FIXME: Check two things: that the template-id names the same type as 2907 // CurClassType, and that the template-id does not occur when the name 2908 // was qualified. 2909 2910 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2911 Context.getCanonicalType(CurClassType))); 2912 NameInfo.setLoc(Name.StartLocation); 2913 // FIXME: should we retrieve TypeSourceInfo? 2914 NameInfo.setNamedTypeInfo(0); 2915 return NameInfo; 2916 } 2917 2918 case UnqualifiedId::IK_DestructorName: { 2919 TypeSourceInfo *TInfo; 2920 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2921 if (Ty.isNull()) 2922 return DeclarationNameInfo(); 2923 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2924 Context.getCanonicalType(Ty))); 2925 NameInfo.setLoc(Name.StartLocation); 2926 NameInfo.setNamedTypeInfo(TInfo); 2927 return NameInfo; 2928 } 2929 2930 case UnqualifiedId::IK_TemplateId: { 2931 TemplateName TName = Name.TemplateId->Template.get(); 2932 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2933 return Context.getNameForTemplate(TName, TNameLoc); 2934 } 2935 2936 } // switch (Name.getKind()) 2937 2938 assert(false && "Unknown name kind"); 2939 return DeclarationNameInfo(); 2940} 2941 2942static QualType getCoreType(QualType Ty) { 2943 do { 2944 if (Ty->isPointerType() || Ty->isReferenceType()) 2945 Ty = Ty->getPointeeType(); 2946 else if (Ty->isArrayType()) 2947 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 2948 else 2949 return Ty.withoutLocalFastQualifiers(); 2950 } while (true); 2951} 2952 2953/// isNearlyMatchingFunction - Determine whether the C++ functions 2954/// Declaration and Definition are "nearly" matching. This heuristic 2955/// is used to improve diagnostics in the case where an out-of-line 2956/// function definition doesn't match any declaration within the class 2957/// or namespace. Also sets Params to the list of indices to the 2958/// parameters that differ between the declaration and the definition. 2959static bool isNearlyMatchingFunction(ASTContext &Context, 2960 FunctionDecl *Declaration, 2961 FunctionDecl *Definition, 2962 llvm::SmallVectorImpl<unsigned> &Params) { 2963 Params.clear(); 2964 if (Declaration->param_size() != Definition->param_size()) 2965 return false; 2966 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2967 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2968 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2969 2970 // The parameter types are identical 2971 if (Context.hasSameType(DefParamTy, DeclParamTy)) 2972 continue; 2973 2974 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 2975 QualType DefParamBaseTy = getCoreType(DefParamTy); 2976 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 2977 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 2978 2979 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 2980 (DeclTyName && DeclTyName == DefTyName)) 2981 Params.push_back(Idx); 2982 else // The two parameters aren't even close 2983 return false; 2984 } 2985 2986 return true; 2987} 2988 2989/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2990/// declarator needs to be rebuilt in the current instantiation. 2991/// Any bits of declarator which appear before the name are valid for 2992/// consideration here. That's specifically the type in the decl spec 2993/// and the base type in any member-pointer chunks. 2994static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2995 DeclarationName Name) { 2996 // The types we specifically need to rebuild are: 2997 // - typenames, typeofs, and decltypes 2998 // - types which will become injected class names 2999 // Of course, we also need to rebuild any type referencing such a 3000 // type. It's safest to just say "dependent", but we call out a 3001 // few cases here. 3002 3003 DeclSpec &DS = D.getMutableDeclSpec(); 3004 switch (DS.getTypeSpecType()) { 3005 case DeclSpec::TST_typename: 3006 case DeclSpec::TST_typeofType: 3007 case DeclSpec::TST_decltype: 3008 case DeclSpec::TST_underlyingType: { 3009 // Grab the type from the parser. 3010 TypeSourceInfo *TSI = 0; 3011 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3012 if (T.isNull() || !T->isDependentType()) break; 3013 3014 // Make sure there's a type source info. This isn't really much 3015 // of a waste; most dependent types should have type source info 3016 // attached already. 3017 if (!TSI) 3018 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3019 3020 // Rebuild the type in the current instantiation. 3021 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3022 if (!TSI) return true; 3023 3024 // Store the new type back in the decl spec. 3025 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3026 DS.UpdateTypeRep(LocType); 3027 break; 3028 } 3029 3030 case DeclSpec::TST_typeofExpr: { 3031 Expr *E = DS.getRepAsExpr(); 3032 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3033 if (Result.isInvalid()) return true; 3034 DS.UpdateExprRep(Result.get()); 3035 break; 3036 } 3037 3038 default: 3039 // Nothing to do for these decl specs. 3040 break; 3041 } 3042 3043 // It doesn't matter what order we do this in. 3044 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3045 DeclaratorChunk &Chunk = D.getTypeObject(I); 3046 3047 // The only type information in the declarator which can come 3048 // before the declaration name is the base type of a member 3049 // pointer. 3050 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3051 continue; 3052 3053 // Rebuild the scope specifier in-place. 3054 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3055 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3056 return true; 3057 } 3058 3059 return false; 3060} 3061 3062Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3063 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), 3064 /*IsFunctionDefinition=*/false); 3065} 3066 3067/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3068/// If T is the name of a class, then each of the following shall have a 3069/// name different from T: 3070/// - every static data member of class T; 3071/// - every member function of class T 3072/// - every member of class T that is itself a type; 3073/// \returns true if the declaration name violates these rules. 3074bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3075 DeclarationNameInfo NameInfo) { 3076 DeclarationName Name = NameInfo.getName(); 3077 3078 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3079 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3080 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3081 return true; 3082 } 3083 3084 return false; 3085} 3086 3087Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3088 MultiTemplateParamsArg TemplateParamLists, 3089 bool IsFunctionDefinition) { 3090 // TODO: consider using NameInfo for diagnostic. 3091 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3092 DeclarationName Name = NameInfo.getName(); 3093 3094 // All of these full declarators require an identifier. If it doesn't have 3095 // one, the ParsedFreeStandingDeclSpec action should be used. 3096 if (!Name) { 3097 if (!D.isInvalidType()) // Reject this if we think it is valid. 3098 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3099 diag::err_declarator_need_ident) 3100 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3101 return 0; 3102 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3103 return 0; 3104 3105 // The scope passed in may not be a decl scope. Zip up the scope tree until 3106 // we find one that is. 3107 while ((S->getFlags() & Scope::DeclScope) == 0 || 3108 (S->getFlags() & Scope::TemplateParamScope) != 0) 3109 S = S->getParent(); 3110 3111 DeclContext *DC = CurContext; 3112 if (D.getCXXScopeSpec().isInvalid()) 3113 D.setInvalidType(); 3114 else if (D.getCXXScopeSpec().isSet()) { 3115 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3116 UPPC_DeclarationQualifier)) 3117 return 0; 3118 3119 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3120 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3121 if (!DC) { 3122 // If we could not compute the declaration context, it's because the 3123 // declaration context is dependent but does not refer to a class, 3124 // class template, or class template partial specialization. Complain 3125 // and return early, to avoid the coming semantic disaster. 3126 Diag(D.getIdentifierLoc(), 3127 diag::err_template_qualified_declarator_no_match) 3128 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3129 << D.getCXXScopeSpec().getRange(); 3130 return 0; 3131 } 3132 bool IsDependentContext = DC->isDependentContext(); 3133 3134 if (!IsDependentContext && 3135 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3136 return 0; 3137 3138 if (isa<CXXRecordDecl>(DC)) { 3139 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3140 Diag(D.getIdentifierLoc(), 3141 diag::err_member_def_undefined_record) 3142 << Name << DC << D.getCXXScopeSpec().getRange(); 3143 D.setInvalidType(); 3144 } else if (isa<CXXRecordDecl>(CurContext) && 3145 !D.getDeclSpec().isFriendSpecified()) { 3146 // The user provided a superfluous scope specifier inside a class 3147 // definition: 3148 // 3149 // class X { 3150 // void X::f(); 3151 // }; 3152 if (CurContext->Equals(DC)) 3153 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3154 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3155 else 3156 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3157 << Name << D.getCXXScopeSpec().getRange(); 3158 3159 // Pretend that this qualifier was not here. 3160 D.getCXXScopeSpec().clear(); 3161 } 3162 } 3163 3164 // Check whether we need to rebuild the type of the given 3165 // declaration in the current instantiation. 3166 if (EnteringContext && IsDependentContext && 3167 TemplateParamLists.size() != 0) { 3168 ContextRAII SavedContext(*this, DC); 3169 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3170 D.setInvalidType(); 3171 } 3172 } 3173 3174 if (DiagnoseClassNameShadow(DC, NameInfo)) 3175 // If this is a typedef, we'll end up spewing multiple diagnostics. 3176 // Just return early; it's safer. 3177 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3178 return 0; 3179 3180 NamedDecl *New; 3181 3182 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3183 QualType R = TInfo->getType(); 3184 3185 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3186 UPPC_DeclarationType)) 3187 D.setInvalidType(); 3188 3189 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3190 ForRedeclaration); 3191 3192 // See if this is a redefinition of a variable in the same scope. 3193 if (!D.getCXXScopeSpec().isSet()) { 3194 bool IsLinkageLookup = false; 3195 3196 // If the declaration we're planning to build will be a function 3197 // or object with linkage, then look for another declaration with 3198 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3199 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3200 /* Do nothing*/; 3201 else if (R->isFunctionType()) { 3202 if (CurContext->isFunctionOrMethod() || 3203 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3204 IsLinkageLookup = true; 3205 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3206 IsLinkageLookup = true; 3207 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3208 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3209 IsLinkageLookup = true; 3210 3211 if (IsLinkageLookup) 3212 Previous.clear(LookupRedeclarationWithLinkage); 3213 3214 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3215 } else { // Something like "int foo::x;" 3216 LookupQualifiedName(Previous, DC); 3217 3218 // Don't consider using declarations as previous declarations for 3219 // out-of-line members. 3220 RemoveUsingDecls(Previous); 3221 3222 // C++ 7.3.1.2p2: 3223 // Members (including explicit specializations of templates) of a named 3224 // namespace can also be defined outside that namespace by explicit 3225 // qualification of the name being defined, provided that the entity being 3226 // defined was already declared in the namespace and the definition appears 3227 // after the point of declaration in a namespace that encloses the 3228 // declarations namespace. 3229 // 3230 // Note that we only check the context at this point. We don't yet 3231 // have enough information to make sure that PrevDecl is actually 3232 // the declaration we want to match. For example, given: 3233 // 3234 // class X { 3235 // void f(); 3236 // void f(float); 3237 // }; 3238 // 3239 // void X::f(int) { } // ill-formed 3240 // 3241 // In this case, PrevDecl will point to the overload set 3242 // containing the two f's declared in X, but neither of them 3243 // matches. 3244 3245 // First check whether we named the global scope. 3246 if (isa<TranslationUnitDecl>(DC)) { 3247 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3248 << Name << D.getCXXScopeSpec().getRange(); 3249 } else { 3250 DeclContext *Cur = CurContext; 3251 while (isa<LinkageSpecDecl>(Cur)) 3252 Cur = Cur->getParent(); 3253 if (!Cur->Encloses(DC)) { 3254 // The qualifying scope doesn't enclose the original declaration. 3255 // Emit diagnostic based on current scope. 3256 SourceLocation L = D.getIdentifierLoc(); 3257 SourceRange R = D.getCXXScopeSpec().getRange(); 3258 if (isa<FunctionDecl>(Cur)) 3259 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3260 else 3261 Diag(L, diag::err_invalid_declarator_scope) 3262 << Name << cast<NamedDecl>(DC) << R; 3263 D.setInvalidType(); 3264 } 3265 } 3266 } 3267 3268 if (Previous.isSingleResult() && 3269 Previous.getFoundDecl()->isTemplateParameter()) { 3270 // Maybe we will complain about the shadowed template parameter. 3271 if (!D.isInvalidType()) 3272 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3273 Previous.getFoundDecl())) 3274 D.setInvalidType(); 3275 3276 // Just pretend that we didn't see the previous declaration. 3277 Previous.clear(); 3278 } 3279 3280 // In C++, the previous declaration we find might be a tag type 3281 // (class or enum). In this case, the new declaration will hide the 3282 // tag type. Note that this does does not apply if we're declaring a 3283 // typedef (C++ [dcl.typedef]p4). 3284 if (Previous.isSingleTagDecl() && 3285 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3286 Previous.clear(); 3287 3288 bool Redeclaration = false; 3289 bool AddToScope = true; 3290 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3291 if (TemplateParamLists.size()) { 3292 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3293 return 0; 3294 } 3295 3296 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 3297 } else if (R->isFunctionType()) { 3298 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 3299 move(TemplateParamLists), 3300 IsFunctionDefinition, Redeclaration, 3301 AddToScope); 3302 } else { 3303 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 3304 move(TemplateParamLists), 3305 Redeclaration); 3306 } 3307 3308 if (New == 0) 3309 return 0; 3310 3311 // If this has an identifier and is not an invalid redeclaration or 3312 // function template specialization, add it to the scope stack. 3313 if (New->getDeclName() && AddToScope && 3314 !(Redeclaration && New->isInvalidDecl())) 3315 PushOnScopeChains(New, S); 3316 3317 return New; 3318} 3319 3320/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3321/// types into constant array types in certain situations which would otherwise 3322/// be errors (for GCC compatibility). 3323static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3324 ASTContext &Context, 3325 bool &SizeIsNegative, 3326 llvm::APSInt &Oversized) { 3327 // This method tries to turn a variable array into a constant 3328 // array even when the size isn't an ICE. This is necessary 3329 // for compatibility with code that depends on gcc's buggy 3330 // constant expression folding, like struct {char x[(int)(char*)2];} 3331 SizeIsNegative = false; 3332 Oversized = 0; 3333 3334 if (T->isDependentType()) 3335 return QualType(); 3336 3337 QualifierCollector Qs; 3338 const Type *Ty = Qs.strip(T); 3339 3340 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3341 QualType Pointee = PTy->getPointeeType(); 3342 QualType FixedType = 3343 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3344 Oversized); 3345 if (FixedType.isNull()) return FixedType; 3346 FixedType = Context.getPointerType(FixedType); 3347 return Qs.apply(Context, FixedType); 3348 } 3349 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3350 QualType Inner = PTy->getInnerType(); 3351 QualType FixedType = 3352 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3353 Oversized); 3354 if (FixedType.isNull()) return FixedType; 3355 FixedType = Context.getParenType(FixedType); 3356 return Qs.apply(Context, FixedType); 3357 } 3358 3359 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3360 if (!VLATy) 3361 return QualType(); 3362 // FIXME: We should probably handle this case 3363 if (VLATy->getElementType()->isVariablyModifiedType()) 3364 return QualType(); 3365 3366 Expr::EvalResult EvalResult; 3367 if (!VLATy->getSizeExpr() || 3368 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3369 !EvalResult.Val.isInt()) 3370 return QualType(); 3371 3372 // Check whether the array size is negative. 3373 llvm::APSInt &Res = EvalResult.Val.getInt(); 3374 if (Res.isSigned() && Res.isNegative()) { 3375 SizeIsNegative = true; 3376 return QualType(); 3377 } 3378 3379 // Check whether the array is too large to be addressed. 3380 unsigned ActiveSizeBits 3381 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3382 Res); 3383 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3384 Oversized = Res; 3385 return QualType(); 3386 } 3387 3388 return Context.getConstantArrayType(VLATy->getElementType(), 3389 Res, ArrayType::Normal, 0); 3390} 3391 3392/// \brief Register the given locally-scoped external C declaration so 3393/// that it can be found later for redeclarations 3394void 3395Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3396 const LookupResult &Previous, 3397 Scope *S) { 3398 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3399 "Decl is not a locally-scoped decl!"); 3400 // Note that we have a locally-scoped external with this name. 3401 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3402 3403 if (!Previous.isSingleResult()) 3404 return; 3405 3406 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3407 3408 // If there was a previous declaration of this variable, it may be 3409 // in our identifier chain. Update the identifier chain with the new 3410 // declaration. 3411 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3412 // The previous declaration was found on the identifer resolver 3413 // chain, so remove it from its scope. 3414 3415 if (S->isDeclScope(PrevDecl)) { 3416 // Special case for redeclarations in the SAME scope. 3417 // Because this declaration is going to be added to the identifier chain 3418 // later, we should temporarily take it OFF the chain. 3419 IdResolver.RemoveDecl(ND); 3420 3421 } else { 3422 // Find the scope for the original declaration. 3423 while (S && !S->isDeclScope(PrevDecl)) 3424 S = S->getParent(); 3425 } 3426 3427 if (S) 3428 S->RemoveDecl(PrevDecl); 3429 } 3430} 3431 3432llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3433Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3434 if (ExternalSource) { 3435 // Load locally-scoped external decls from the external source. 3436 SmallVector<NamedDecl *, 4> Decls; 3437 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3438 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3439 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3440 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3441 if (Pos == LocallyScopedExternalDecls.end()) 3442 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3443 } 3444 } 3445 3446 return LocallyScopedExternalDecls.find(Name); 3447} 3448 3449/// \brief Diagnose function specifiers on a declaration of an identifier that 3450/// does not identify a function. 3451void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3452 // FIXME: We should probably indicate the identifier in question to avoid 3453 // confusion for constructs like "inline int a(), b;" 3454 if (D.getDeclSpec().isInlineSpecified()) 3455 Diag(D.getDeclSpec().getInlineSpecLoc(), 3456 diag::err_inline_non_function); 3457 3458 if (D.getDeclSpec().isVirtualSpecified()) 3459 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3460 diag::err_virtual_non_function); 3461 3462 if (D.getDeclSpec().isExplicitSpecified()) 3463 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3464 diag::err_explicit_non_function); 3465} 3466 3467NamedDecl* 3468Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3469 QualType R, TypeSourceInfo *TInfo, 3470 LookupResult &Previous, bool &Redeclaration) { 3471 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3472 if (D.getCXXScopeSpec().isSet()) { 3473 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3474 << D.getCXXScopeSpec().getRange(); 3475 D.setInvalidType(); 3476 // Pretend we didn't see the scope specifier. 3477 DC = CurContext; 3478 Previous.clear(); 3479 } 3480 3481 if (getLangOptions().CPlusPlus) { 3482 // Check that there are no default arguments (C++ only). 3483 CheckExtraCXXDefaultArguments(D); 3484 } 3485 3486 DiagnoseFunctionSpecifiers(D); 3487 3488 if (D.getDeclSpec().isThreadSpecified()) 3489 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3490 if (D.getDeclSpec().isConstexprSpecified()) 3491 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3492 << 1; 3493 3494 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3495 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3496 << D.getName().getSourceRange(); 3497 return 0; 3498 } 3499 3500 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 3501 if (!NewTD) return 0; 3502 3503 // Handle attributes prior to checking for duplicates in MergeVarDecl 3504 ProcessDeclAttributes(S, NewTD, D); 3505 3506 CheckTypedefForVariablyModifiedType(S, NewTD); 3507 3508 return ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3509} 3510 3511void 3512Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3513 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3514 // then it shall have block scope. 3515 // Note that variably modified types must be fixed before merging the decl so 3516 // that redeclarations will match. 3517 QualType T = NewTD->getUnderlyingType(); 3518 if (T->isVariablyModifiedType()) { 3519 getCurFunction()->setHasBranchProtectedScope(); 3520 3521 if (S->getFnParent() == 0) { 3522 bool SizeIsNegative; 3523 llvm::APSInt Oversized; 3524 QualType FixedTy = 3525 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3526 Oversized); 3527 if (!FixedTy.isNull()) { 3528 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3529 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3530 } else { 3531 if (SizeIsNegative) 3532 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3533 else if (T->isVariableArrayType()) 3534 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3535 else if (Oversized.getBoolValue()) 3536 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3537 else 3538 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3539 NewTD->setInvalidDecl(); 3540 } 3541 } 3542 } 3543} 3544 3545 3546/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3547/// declares a typedef-name, either using the 'typedef' type specifier or via 3548/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3549NamedDecl* 3550Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3551 LookupResult &Previous, bool &Redeclaration) { 3552 // Merge the decl with the existing one if appropriate. If the decl is 3553 // in an outer scope, it isn't the same thing. 3554 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3555 /*ExplicitInstantiationOrSpecialization=*/false); 3556 if (!Previous.empty()) { 3557 Redeclaration = true; 3558 MergeTypedefNameDecl(NewTD, Previous); 3559 } 3560 3561 // If this is the C FILE type, notify the AST context. 3562 if (IdentifierInfo *II = NewTD->getIdentifier()) 3563 if (!NewTD->isInvalidDecl() && 3564 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3565 if (II->isStr("FILE")) 3566 Context.setFILEDecl(NewTD); 3567 else if (II->isStr("jmp_buf")) 3568 Context.setjmp_bufDecl(NewTD); 3569 else if (II->isStr("sigjmp_buf")) 3570 Context.setsigjmp_bufDecl(NewTD); 3571 else if (II->isStr("__builtin_va_list")) 3572 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3573 } 3574 3575 return NewTD; 3576} 3577 3578/// \brief Determines whether the given declaration is an out-of-scope 3579/// previous declaration. 3580/// 3581/// This routine should be invoked when name lookup has found a 3582/// previous declaration (PrevDecl) that is not in the scope where a 3583/// new declaration by the same name is being introduced. If the new 3584/// declaration occurs in a local scope, previous declarations with 3585/// linkage may still be considered previous declarations (C99 3586/// 6.2.2p4-5, C++ [basic.link]p6). 3587/// 3588/// \param PrevDecl the previous declaration found by name 3589/// lookup 3590/// 3591/// \param DC the context in which the new declaration is being 3592/// declared. 3593/// 3594/// \returns true if PrevDecl is an out-of-scope previous declaration 3595/// for a new delcaration with the same name. 3596static bool 3597isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3598 ASTContext &Context) { 3599 if (!PrevDecl) 3600 return false; 3601 3602 if (!PrevDecl->hasLinkage()) 3603 return false; 3604 3605 if (Context.getLangOptions().CPlusPlus) { 3606 // C++ [basic.link]p6: 3607 // If there is a visible declaration of an entity with linkage 3608 // having the same name and type, ignoring entities declared 3609 // outside the innermost enclosing namespace scope, the block 3610 // scope declaration declares that same entity and receives the 3611 // linkage of the previous declaration. 3612 DeclContext *OuterContext = DC->getRedeclContext(); 3613 if (!OuterContext->isFunctionOrMethod()) 3614 // This rule only applies to block-scope declarations. 3615 return false; 3616 3617 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3618 if (PrevOuterContext->isRecord()) 3619 // We found a member function: ignore it. 3620 return false; 3621 3622 // Find the innermost enclosing namespace for the new and 3623 // previous declarations. 3624 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3625 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3626 3627 // The previous declaration is in a different namespace, so it 3628 // isn't the same function. 3629 if (!OuterContext->Equals(PrevOuterContext)) 3630 return false; 3631 } 3632 3633 return true; 3634} 3635 3636static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3637 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3638 if (!SS.isSet()) return; 3639 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3640} 3641 3642bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3643 QualType type = decl->getType(); 3644 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3645 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3646 // Various kinds of declaration aren't allowed to be __autoreleasing. 3647 unsigned kind = -1U; 3648 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3649 if (var->hasAttr<BlocksAttr>()) 3650 kind = 0; // __block 3651 else if (!var->hasLocalStorage()) 3652 kind = 1; // global 3653 } else if (isa<ObjCIvarDecl>(decl)) { 3654 kind = 3; // ivar 3655 } else if (isa<FieldDecl>(decl)) { 3656 kind = 2; // field 3657 } 3658 3659 if (kind != -1U) { 3660 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3661 << kind; 3662 } 3663 } else if (lifetime == Qualifiers::OCL_None) { 3664 // Try to infer lifetime. 3665 if (!type->isObjCLifetimeType()) 3666 return false; 3667 3668 lifetime = type->getObjCARCImplicitLifetime(); 3669 type = Context.getLifetimeQualifiedType(type, lifetime); 3670 decl->setType(type); 3671 } 3672 3673 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3674 // Thread-local variables cannot have lifetime. 3675 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3676 var->isThreadSpecified()) { 3677 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3678 << var->getType(); 3679 return true; 3680 } 3681 } 3682 3683 return false; 3684} 3685 3686NamedDecl* 3687Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3688 QualType R, TypeSourceInfo *TInfo, 3689 LookupResult &Previous, 3690 MultiTemplateParamsArg TemplateParamLists, 3691 bool &Redeclaration) { 3692 DeclarationName Name = GetNameForDeclarator(D).getName(); 3693 3694 // Check that there are no default arguments (C++ only). 3695 if (getLangOptions().CPlusPlus) 3696 CheckExtraCXXDefaultArguments(D); 3697 3698 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3699 assert(SCSpec != DeclSpec::SCS_typedef && 3700 "Parser allowed 'typedef' as storage class VarDecl."); 3701 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3702 if (SCSpec == DeclSpec::SCS_mutable) { 3703 // mutable can only appear on non-static class members, so it's always 3704 // an error here 3705 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3706 D.setInvalidType(); 3707 SC = SC_None; 3708 } 3709 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3710 VarDecl::StorageClass SCAsWritten 3711 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3712 3713 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3714 if (!II) { 3715 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3716 << Name.getAsString(); 3717 return 0; 3718 } 3719 3720 DiagnoseFunctionSpecifiers(D); 3721 3722 if (!DC->isRecord() && S->getFnParent() == 0) { 3723 // C99 6.9p2: The storage-class specifiers auto and register shall not 3724 // appear in the declaration specifiers in an external declaration. 3725 if (SC == SC_Auto || SC == SC_Register) { 3726 3727 // If this is a register variable with an asm label specified, then this 3728 // is a GNU extension. 3729 if (SC == SC_Register && D.getAsmLabel()) 3730 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3731 else 3732 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3733 D.setInvalidType(); 3734 } 3735 } 3736 3737 if (getLangOptions().OpenCL) { 3738 // Set up the special work-group-local storage class for variables in the 3739 // OpenCL __local address space. 3740 if (R.getAddressSpace() == LangAS::opencl_local) 3741 SC = SC_OpenCLWorkGroupLocal; 3742 } 3743 3744 bool isExplicitSpecialization = false; 3745 VarDecl *NewVD; 3746 if (!getLangOptions().CPlusPlus) { 3747 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3748 D.getIdentifierLoc(), II, 3749 R, TInfo, SC, SCAsWritten); 3750 3751 if (D.isInvalidType()) 3752 NewVD->setInvalidDecl(); 3753 } else { 3754 if (DC->isRecord() && !CurContext->isRecord()) { 3755 // This is an out-of-line definition of a static data member. 3756 if (SC == SC_Static) { 3757 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3758 diag::err_static_out_of_line) 3759 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3760 } else if (SC == SC_None) 3761 SC = SC_Static; 3762 } 3763 if (SC == SC_Static) { 3764 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3765 if (RD->isLocalClass()) 3766 Diag(D.getIdentifierLoc(), 3767 diag::err_static_data_member_not_allowed_in_local_class) 3768 << Name << RD->getDeclName(); 3769 3770 // C++ [class.union]p1: If a union contains a static data member, 3771 // the program is ill-formed. 3772 // 3773 // We also disallow static data members in anonymous structs. 3774 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3775 Diag(D.getIdentifierLoc(), 3776 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3777 << Name << RD->isUnion(); 3778 } 3779 } 3780 3781 // Match up the template parameter lists with the scope specifier, then 3782 // determine whether we have a template or a template specialization. 3783 isExplicitSpecialization = false; 3784 bool Invalid = false; 3785 if (TemplateParameterList *TemplateParams 3786 = MatchTemplateParametersToScopeSpecifier( 3787 D.getDeclSpec().getSourceRange().getBegin(), 3788 D.getIdentifierLoc(), 3789 D.getCXXScopeSpec(), 3790 TemplateParamLists.get(), 3791 TemplateParamLists.size(), 3792 /*never a friend*/ false, 3793 isExplicitSpecialization, 3794 Invalid)) { 3795 if (TemplateParams->size() > 0) { 3796 // There is no such thing as a variable template. 3797 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3798 << II 3799 << SourceRange(TemplateParams->getTemplateLoc(), 3800 TemplateParams->getRAngleLoc()); 3801 return 0; 3802 } else { 3803 // There is an extraneous 'template<>' for this variable. Complain 3804 // about it, but allow the declaration of the variable. 3805 Diag(TemplateParams->getTemplateLoc(), 3806 diag::err_template_variable_noparams) 3807 << II 3808 << SourceRange(TemplateParams->getTemplateLoc(), 3809 TemplateParams->getRAngleLoc()); 3810 } 3811 } 3812 3813 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3814 D.getIdentifierLoc(), II, 3815 R, TInfo, SC, SCAsWritten); 3816 3817 // If this decl has an auto type in need of deduction, make a note of the 3818 // Decl so we can diagnose uses of it in its own initializer. 3819 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3820 R->getContainedAutoType()) 3821 ParsingInitForAutoVars.insert(NewVD); 3822 3823 if (D.isInvalidType() || Invalid) 3824 NewVD->setInvalidDecl(); 3825 3826 SetNestedNameSpecifier(NewVD, D); 3827 3828 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3829 NewVD->setTemplateParameterListsInfo(Context, 3830 TemplateParamLists.size(), 3831 TemplateParamLists.release()); 3832 } 3833 3834 if (D.getDeclSpec().isConstexprSpecified()) { 3835 // FIXME: check this is a valid use of constexpr. 3836 NewVD->setConstexpr(true); 3837 } 3838 } 3839 3840 // Set the lexical context. If the declarator has a C++ scope specifier, the 3841 // lexical context will be different from the semantic context. 3842 NewVD->setLexicalDeclContext(CurContext); 3843 3844 if (D.getDeclSpec().isThreadSpecified()) { 3845 if (NewVD->hasLocalStorage()) 3846 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3847 else if (!Context.getTargetInfo().isTLSSupported()) 3848 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3849 else 3850 NewVD->setThreadSpecified(true); 3851 } 3852 3853 if (D.getDeclSpec().isModulePrivateSpecified()) { 3854 if (isExplicitSpecialization) 3855 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3856 << 2 3857 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3858 else if (NewVD->hasLocalStorage()) 3859 Diag(NewVD->getLocation(), diag::err_module_private_local) 3860 << 0 << NewVD->getDeclName() 3861 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3862 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3863 else 3864 NewVD->setModulePrivate(); 3865 } 3866 3867 // Handle attributes prior to checking for duplicates in MergeVarDecl 3868 ProcessDeclAttributes(S, NewVD, D); 3869 3870 // In auto-retain/release, infer strong retension for variables of 3871 // retainable type. 3872 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3873 NewVD->setInvalidDecl(); 3874 3875 // Handle GNU asm-label extension (encoded as an attribute). 3876 if (Expr *E = (Expr*)D.getAsmLabel()) { 3877 // The parser guarantees this is a string. 3878 StringLiteral *SE = cast<StringLiteral>(E); 3879 StringRef Label = SE->getString(); 3880 if (S->getFnParent() != 0) { 3881 switch (SC) { 3882 case SC_None: 3883 case SC_Auto: 3884 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3885 break; 3886 case SC_Register: 3887 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 3888 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3889 break; 3890 case SC_Static: 3891 case SC_Extern: 3892 case SC_PrivateExtern: 3893 case SC_OpenCLWorkGroupLocal: 3894 break; 3895 } 3896 } 3897 3898 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3899 Context, Label)); 3900 } 3901 3902 // Diagnose shadowed variables before filtering for scope. 3903 if (!D.getCXXScopeSpec().isSet()) 3904 CheckShadow(S, NewVD, Previous); 3905 3906 // Don't consider existing declarations that are in a different 3907 // scope and are out-of-semantic-context declarations (if the new 3908 // declaration has linkage). 3909 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 3910 isExplicitSpecialization); 3911 3912 if (!getLangOptions().CPlusPlus) 3913 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3914 else { 3915 // Merge the decl with the existing one if appropriate. 3916 if (!Previous.empty()) { 3917 if (Previous.isSingleResult() && 3918 isa<FieldDecl>(Previous.getFoundDecl()) && 3919 D.getCXXScopeSpec().isSet()) { 3920 // The user tried to define a non-static data member 3921 // out-of-line (C++ [dcl.meaning]p1). 3922 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3923 << D.getCXXScopeSpec().getRange(); 3924 Previous.clear(); 3925 NewVD->setInvalidDecl(); 3926 } 3927 } else if (D.getCXXScopeSpec().isSet()) { 3928 // No previous declaration in the qualifying scope. 3929 Diag(D.getIdentifierLoc(), diag::err_no_member) 3930 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3931 << D.getCXXScopeSpec().getRange(); 3932 NewVD->setInvalidDecl(); 3933 } 3934 3935 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3936 3937 // This is an explicit specialization of a static data member. Check it. 3938 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3939 CheckMemberSpecialization(NewVD, Previous)) 3940 NewVD->setInvalidDecl(); 3941 } 3942 3943 // attributes declared post-definition are currently ignored 3944 // FIXME: This should be handled in attribute merging, not 3945 // here. 3946 if (Previous.isSingleResult()) { 3947 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3948 if (Def && (Def = Def->getDefinition()) && 3949 Def != NewVD && D.hasAttributes()) { 3950 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3951 Diag(Def->getLocation(), diag::note_previous_definition); 3952 } 3953 } 3954 3955 // If this is a locally-scoped extern C variable, update the map of 3956 // such variables. 3957 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3958 !NewVD->isInvalidDecl()) 3959 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3960 3961 // If there's a #pragma GCC visibility in scope, and this isn't a class 3962 // member, set the visibility of this variable. 3963 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3964 AddPushedVisibilityAttribute(NewVD); 3965 3966 MarkUnusedFileScopedDecl(NewVD); 3967 3968 return NewVD; 3969} 3970 3971/// \brief Diagnose variable or built-in function shadowing. Implements 3972/// -Wshadow. 3973/// 3974/// This method is called whenever a VarDecl is added to a "useful" 3975/// scope. 3976/// 3977/// \param S the scope in which the shadowing name is being declared 3978/// \param R the lookup of the name 3979/// 3980void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 3981 // Return if warning is ignored. 3982 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 3983 Diagnostic::Ignored) 3984 return; 3985 3986 // Don't diagnose declarations at file scope. 3987 if (D->hasGlobalStorage()) 3988 return; 3989 3990 DeclContext *NewDC = D->getDeclContext(); 3991 3992 // Only diagnose if we're shadowing an unambiguous field or variable. 3993 if (R.getResultKind() != LookupResult::Found) 3994 return; 3995 3996 NamedDecl* ShadowedDecl = R.getFoundDecl(); 3997 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 3998 return; 3999 4000 // Fields are not shadowed by variables in C++ static methods. 4001 if (isa<FieldDecl>(ShadowedDecl)) 4002 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4003 if (MD->isStatic()) 4004 return; 4005 4006 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4007 if (shadowedVar->isExternC()) { 4008 // For shadowing external vars, make sure that we point to the global 4009 // declaration, not a locally scoped extern declaration. 4010 for (VarDecl::redecl_iterator 4011 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4012 I != E; ++I) 4013 if (I->isFileVarDecl()) { 4014 ShadowedDecl = *I; 4015 break; 4016 } 4017 } 4018 4019 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4020 4021 // Only warn about certain kinds of shadowing for class members. 4022 if (NewDC && NewDC->isRecord()) { 4023 // In particular, don't warn about shadowing non-class members. 4024 if (!OldDC->isRecord()) 4025 return; 4026 4027 // TODO: should we warn about static data members shadowing 4028 // static data members from base classes? 4029 4030 // TODO: don't diagnose for inaccessible shadowed members. 4031 // This is hard to do perfectly because we might friend the 4032 // shadowing context, but that's just a false negative. 4033 } 4034 4035 // Determine what kind of declaration we're shadowing. 4036 unsigned Kind; 4037 if (isa<RecordDecl>(OldDC)) { 4038 if (isa<FieldDecl>(ShadowedDecl)) 4039 Kind = 3; // field 4040 else 4041 Kind = 2; // static data member 4042 } else if (OldDC->isFileContext()) 4043 Kind = 1; // global 4044 else 4045 Kind = 0; // local 4046 4047 DeclarationName Name = R.getLookupName(); 4048 4049 // Emit warning and note. 4050 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4051 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4052} 4053 4054/// \brief Check -Wshadow without the advantage of a previous lookup. 4055void Sema::CheckShadow(Scope *S, VarDecl *D) { 4056 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4057 Diagnostic::Ignored) 4058 return; 4059 4060 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4061 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4062 LookupName(R, S); 4063 CheckShadow(S, D, R); 4064} 4065 4066/// \brief Perform semantic checking on a newly-created variable 4067/// declaration. 4068/// 4069/// This routine performs all of the type-checking required for a 4070/// variable declaration once it has been built. It is used both to 4071/// check variables after they have been parsed and their declarators 4072/// have been translated into a declaration, and to check variables 4073/// that have been instantiated from a template. 4074/// 4075/// Sets NewVD->isInvalidDecl() if an error was encountered. 4076void Sema::CheckVariableDeclaration(VarDecl *NewVD, 4077 LookupResult &Previous, 4078 bool &Redeclaration) { 4079 // If the decl is already known invalid, don't check it. 4080 if (NewVD->isInvalidDecl()) 4081 return; 4082 4083 QualType T = NewVD->getType(); 4084 4085 if (T->isObjCObjectType()) { 4086 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4087 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4088 T = Context.getObjCObjectPointerType(T); 4089 NewVD->setType(T); 4090 } 4091 4092 // Emit an error if an address space was applied to decl with local storage. 4093 // This includes arrays of objects with address space qualifiers, but not 4094 // automatic variables that point to other address spaces. 4095 // ISO/IEC TR 18037 S5.1.2 4096 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4097 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4098 return NewVD->setInvalidDecl(); 4099 } 4100 4101 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4102 && !NewVD->hasAttr<BlocksAttr>()) { 4103 if (getLangOptions().getGC() != LangOptions::NonGC) 4104 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4105 else 4106 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4107 } 4108 4109 bool isVM = T->isVariablyModifiedType(); 4110 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4111 NewVD->hasAttr<BlocksAttr>()) 4112 getCurFunction()->setHasBranchProtectedScope(); 4113 4114 if ((isVM && NewVD->hasLinkage()) || 4115 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4116 bool SizeIsNegative; 4117 llvm::APSInt Oversized; 4118 QualType FixedTy = 4119 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4120 Oversized); 4121 4122 if (FixedTy.isNull() && T->isVariableArrayType()) { 4123 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4124 // FIXME: This won't give the correct result for 4125 // int a[10][n]; 4126 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4127 4128 if (NewVD->isFileVarDecl()) 4129 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4130 << SizeRange; 4131 else if (NewVD->getStorageClass() == SC_Static) 4132 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4133 << SizeRange; 4134 else 4135 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4136 << SizeRange; 4137 return NewVD->setInvalidDecl(); 4138 } 4139 4140 if (FixedTy.isNull()) { 4141 if (NewVD->isFileVarDecl()) 4142 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4143 else 4144 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4145 return NewVD->setInvalidDecl(); 4146 } 4147 4148 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4149 NewVD->setType(FixedTy); 4150 } 4151 4152 if (Previous.empty() && NewVD->isExternC()) { 4153 // Since we did not find anything by this name and we're declaring 4154 // an extern "C" variable, look for a non-visible extern "C" 4155 // declaration with the same name. 4156 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4157 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4158 if (Pos != LocallyScopedExternalDecls.end()) 4159 Previous.addDecl(Pos->second); 4160 } 4161 4162 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4163 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4164 << T; 4165 return NewVD->setInvalidDecl(); 4166 } 4167 4168 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4169 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4170 return NewVD->setInvalidDecl(); 4171 } 4172 4173 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4174 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4175 return NewVD->setInvalidDecl(); 4176 } 4177 4178 // Function pointers and references cannot have qualified function type, only 4179 // function pointer-to-members can do that. 4180 QualType Pointee; 4181 unsigned PtrOrRef = 0; 4182 if (const PointerType *Ptr = T->getAs<PointerType>()) 4183 Pointee = Ptr->getPointeeType(); 4184 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4185 Pointee = Ref->getPointeeType(); 4186 PtrOrRef = 1; 4187 } 4188 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4189 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4190 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4191 << PtrOrRef; 4192 return NewVD->setInvalidDecl(); 4193 } 4194 4195 if (!Previous.empty()) { 4196 Redeclaration = true; 4197 MergeVarDecl(NewVD, Previous); 4198 } 4199} 4200 4201/// \brief Data used with FindOverriddenMethod 4202struct FindOverriddenMethodData { 4203 Sema *S; 4204 CXXMethodDecl *Method; 4205}; 4206 4207/// \brief Member lookup function that determines whether a given C++ 4208/// method overrides a method in a base class, to be used with 4209/// CXXRecordDecl::lookupInBases(). 4210static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4211 CXXBasePath &Path, 4212 void *UserData) { 4213 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4214 4215 FindOverriddenMethodData *Data 4216 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4217 4218 DeclarationName Name = Data->Method->getDeclName(); 4219 4220 // FIXME: Do we care about other names here too? 4221 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4222 // We really want to find the base class destructor here. 4223 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4224 CanQualType CT = Data->S->Context.getCanonicalType(T); 4225 4226 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4227 } 4228 4229 for (Path.Decls = BaseRecord->lookup(Name); 4230 Path.Decls.first != Path.Decls.second; 4231 ++Path.Decls.first) { 4232 NamedDecl *D = *Path.Decls.first; 4233 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4234 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4235 return true; 4236 } 4237 } 4238 4239 return false; 4240} 4241 4242/// AddOverriddenMethods - See if a method overrides any in the base classes, 4243/// and if so, check that it's a valid override and remember it. 4244bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4245 // Look for virtual methods in base classes that this method might override. 4246 CXXBasePaths Paths; 4247 FindOverriddenMethodData Data; 4248 Data.Method = MD; 4249 Data.S = this; 4250 bool AddedAny = false; 4251 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4252 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4253 E = Paths.found_decls_end(); I != E; ++I) { 4254 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4255 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4256 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4257 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4258 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4259 AddedAny = true; 4260 } 4261 } 4262 } 4263 } 4264 4265 return AddedAny; 4266} 4267 4268static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD, 4269 bool isFriendDecl) { 4270 DeclarationName Name = NewFD->getDeclName(); 4271 DeclContext *DC = NewFD->getDeclContext(); 4272 LookupResult Prev(S, Name, NewFD->getLocation(), 4273 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4274 llvm::SmallVector<unsigned, 1> MismatchedParams; 4275 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4276 TypoCorrection Correction; 4277 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4278 : diag::err_member_def_does_not_match; 4279 4280 NewFD->setInvalidDecl(); 4281 S.LookupQualifiedName(Prev, DC); 4282 assert(!Prev.isAmbiguous() && 4283 "Cannot have an ambiguity in previous-declaration lookup"); 4284 if (!Prev.empty()) { 4285 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4286 Func != FuncEnd; ++Func) { 4287 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4288 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4289 MismatchedParams)) { 4290 // Add 1 to the index so that 0 can mean the mismatch didn't 4291 // involve a parameter 4292 unsigned ParamNum = 4293 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4294 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4295 } 4296 } 4297 // If the qualified name lookup yielded nothing, try typo correction 4298 } else if ((Correction = S.CorrectTypo(Prev.getLookupNameInfo(), 4299 Prev.getLookupKind(), 0, 0, DC)) && 4300 Correction.getCorrection() != Name) { 4301 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4302 CDeclEnd = Correction.end(); 4303 CDecl != CDeclEnd; ++CDecl) { 4304 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4305 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4306 MismatchedParams)) { 4307 // Add 1 to the index so that 0 can mean the mismatch didn't 4308 // involve a parameter 4309 unsigned ParamNum = 4310 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4311 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4312 } 4313 } 4314 if (!NearMatches.empty()) 4315 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4316 : diag::err_member_def_does_not_match_suggest; 4317 } 4318 4319 // Ignore the correction if it didn't yield any close FunctionDecl matches 4320 if (Correction && NearMatches.empty()) 4321 Correction = TypoCorrection(); 4322 4323 if (Correction) 4324 S.Diag(NewFD->getLocation(), DiagMsg) 4325 << Name << DC << Correction.getQuoted(S.getLangOptions()) 4326 << FixItHint::CreateReplacement( 4327 NewFD->getLocation(), Correction.getAsString(S.getLangOptions())); 4328 else 4329 S.Diag(NewFD->getLocation(), DiagMsg) << Name << DC << NewFD->getLocation(); 4330 4331 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4332 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4333 NearMatch != NearMatchEnd; ++NearMatch) { 4334 FunctionDecl *FD = NearMatch->first; 4335 4336 if (unsigned Idx = NearMatch->second) { 4337 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4338 S.Diag(FDParam->getTypeSpecStartLoc(), 4339 diag::note_member_def_close_param_match) 4340 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4341 } else if (Correction) { 4342 S.Diag(FD->getLocation(), diag::note_previous_decl) 4343 << Correction.getQuoted(S.getLangOptions()); 4344 } else 4345 S.Diag(FD->getLocation(), diag::note_member_def_close_match); 4346 } 4347} 4348 4349NamedDecl* 4350Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4351 QualType R, TypeSourceInfo *TInfo, 4352 LookupResult &Previous, 4353 MultiTemplateParamsArg TemplateParamLists, 4354 bool IsFunctionDefinition, bool &Redeclaration, 4355 bool &AddToScope) { 4356 assert(R.getTypePtr()->isFunctionType()); 4357 4358 // TODO: consider using NameInfo for diagnostic. 4359 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4360 DeclarationName Name = NameInfo.getName(); 4361 FunctionDecl::StorageClass SC = SC_None; 4362 switch (D.getDeclSpec().getStorageClassSpec()) { 4363 default: assert(0 && "Unknown storage class!"); 4364 case DeclSpec::SCS_auto: 4365 case DeclSpec::SCS_register: 4366 case DeclSpec::SCS_mutable: 4367 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4368 diag::err_typecheck_sclass_func); 4369 D.setInvalidType(); 4370 break; 4371 case DeclSpec::SCS_unspecified: SC = SC_None; break; 4372 case DeclSpec::SCS_extern: SC = SC_Extern; break; 4373 case DeclSpec::SCS_static: { 4374 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 4375 // C99 6.7.1p5: 4376 // The declaration of an identifier for a function that has 4377 // block scope shall have no explicit storage-class specifier 4378 // other than extern 4379 // See also (C++ [dcl.stc]p4). 4380 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4381 diag::err_static_block_func); 4382 SC = SC_None; 4383 } else 4384 SC = SC_Static; 4385 break; 4386 } 4387 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 4388 } 4389 4390 if (D.getDeclSpec().isThreadSpecified()) 4391 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4392 4393 // Do not allow returning a objc interface by-value. 4394 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4395 Diag(D.getIdentifierLoc(), 4396 diag::err_object_cannot_be_passed_returned_by_value) << 0 4397 << R->getAs<FunctionType>()->getResultType() 4398 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4399 4400 QualType T = R->getAs<FunctionType>()->getResultType(); 4401 T = Context.getObjCObjectPointerType(T); 4402 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4403 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4404 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4405 FPT->getNumArgs(), EPI); 4406 } 4407 else if (isa<FunctionNoProtoType>(R)) 4408 R = Context.getFunctionNoProtoType(T); 4409 } 4410 4411 FunctionDecl *NewFD; 4412 bool isInline = D.getDeclSpec().isInlineSpecified(); 4413 bool isFriend = false; 4414 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4415 FunctionDecl::StorageClass SCAsWritten 4416 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4417 FunctionTemplateDecl *FunctionTemplate = 0; 4418 bool isExplicitSpecialization = false; 4419 bool isFunctionTemplateSpecialization = false; 4420 bool isDependentClassScopeExplicitSpecialization = false; 4421 4422 if (!getLangOptions().CPlusPlus) { 4423 // Determine whether the function was written with a 4424 // prototype. This true when: 4425 // - there is a prototype in the declarator, or 4426 // - the type R of the function is some kind of typedef or other reference 4427 // to a type name (which eventually refers to a function type). 4428 bool HasPrototype = 4429 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4430 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4431 4432 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4433 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4434 HasPrototype); 4435 if (D.isInvalidType()) 4436 NewFD->setInvalidDecl(); 4437 4438 // Set the lexical context. 4439 NewFD->setLexicalDeclContext(CurContext); 4440 // Filter out previous declarations that don't match the scope. 4441 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4442 /*ExplicitInstantiationOrSpecialization=*/false); 4443 } else { 4444 isFriend = D.getDeclSpec().isFriendSpecified(); 4445 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4446 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4447 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4448 bool isVirtualOkay = false; 4449 4450 // Check that the return type is not an abstract class type. 4451 // For record types, this is done by the AbstractClassUsageDiagnoser once 4452 // the class has been completely parsed. 4453 if (!DC->isRecord() && 4454 RequireNonAbstractType(D.getIdentifierLoc(), 4455 R->getAs<FunctionType>()->getResultType(), 4456 diag::err_abstract_type_in_decl, 4457 AbstractReturnType)) 4458 D.setInvalidType(); 4459 4460 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4461 // This is a C++ constructor declaration. 4462 assert(DC->isRecord() && 4463 "Constructors can only be declared in a member context"); 4464 4465 R = CheckConstructorDeclarator(D, R, SC); 4466 4467 // Create the new declaration 4468 CXXConstructorDecl *NewCD = CXXConstructorDecl::Create( 4469 Context, 4470 cast<CXXRecordDecl>(DC), 4471 D.getSourceRange().getBegin(), 4472 NameInfo, R, TInfo, 4473 isExplicit, isInline, 4474 /*isImplicitlyDeclared=*/false, 4475 isConstexpr); 4476 4477 NewFD = NewCD; 4478 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4479 // This is a C++ destructor declaration. 4480 if (DC->isRecord()) { 4481 R = CheckDestructorDeclarator(D, R, SC); 4482 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4483 4484 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(Context, Record, 4485 D.getSourceRange().getBegin(), 4486 NameInfo, R, TInfo, 4487 isInline, 4488 /*isImplicitlyDeclared=*/false); 4489 NewFD = NewDD; 4490 isVirtualOkay = true; 4491 4492 // If the class is complete, then we now create the implicit exception 4493 // specification. If the class is incomplete or dependent, we can't do 4494 // it yet. 4495 if (getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4496 Record->getDefinition() && !Record->isBeingDefined() && 4497 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4498 AdjustDestructorExceptionSpec(Record, NewDD); 4499 } 4500 4501 } else { 4502 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4503 4504 // Create a FunctionDecl to satisfy the function definition parsing 4505 // code path. 4506 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4507 D.getIdentifierLoc(), Name, R, TInfo, 4508 SC, SCAsWritten, isInline, 4509 /*hasPrototype=*/true, isConstexpr); 4510 D.setInvalidType(); 4511 } 4512 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4513 if (!DC->isRecord()) { 4514 Diag(D.getIdentifierLoc(), 4515 diag::err_conv_function_not_member); 4516 return 0; 4517 } 4518 4519 CheckConversionDeclarator(D, R, SC); 4520 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 4521 D.getSourceRange().getBegin(), 4522 NameInfo, R, TInfo, 4523 isInline, isExplicit, isConstexpr, 4524 SourceLocation()); 4525 4526 isVirtualOkay = true; 4527 } else if (DC->isRecord()) { 4528 // If the name of the function is the same as the name of the record, 4529 // then this must be an invalid constructor that has a return type. 4530 // (The parser checks for a return type and makes the declarator a 4531 // constructor if it has no return type). 4532 if (Name.getAsIdentifierInfo() && 4533 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4534 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4535 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4536 << SourceRange(D.getIdentifierLoc()); 4537 return 0; 4538 } 4539 4540 bool isStatic = SC == SC_Static; 4541 4542 // [class.free]p1: 4543 // Any allocation function for a class T is a static member 4544 // (even if not explicitly declared static). 4545 if (Name.getCXXOverloadedOperator() == OO_New || 4546 Name.getCXXOverloadedOperator() == OO_Array_New) 4547 isStatic = true; 4548 4549 // [class.free]p6 Any deallocation function for a class X is a static member 4550 // (even if not explicitly declared static). 4551 if (Name.getCXXOverloadedOperator() == OO_Delete || 4552 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4553 isStatic = true; 4554 4555 // This is a C++ method declaration. 4556 CXXMethodDecl *NewMD = CXXMethodDecl::Create( 4557 Context, cast<CXXRecordDecl>(DC), 4558 D.getSourceRange().getBegin(), 4559 NameInfo, R, TInfo, 4560 isStatic, SCAsWritten, isInline, 4561 isConstexpr, 4562 SourceLocation()); 4563 NewFD = NewMD; 4564 4565 isVirtualOkay = !isStatic; 4566 } else { 4567 // Determine whether the function was written with a 4568 // prototype. This true when: 4569 // - we're in C++ (where every function has a prototype), 4570 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4571 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4572 true/*HasPrototype*/, isConstexpr); 4573 } 4574 4575 if (isFriend && !isInline && IsFunctionDefinition) { 4576 // C++ [class.friend]p5 4577 // A function can be defined in a friend declaration of a 4578 // class . . . . Such a function is implicitly inline. 4579 NewFD->setImplicitlyInline(); 4580 } 4581 4582 SetNestedNameSpecifier(NewFD, D); 4583 isExplicitSpecialization = false; 4584 isFunctionTemplateSpecialization = false; 4585 if (D.isInvalidType()) 4586 NewFD->setInvalidDecl(); 4587 4588 // Set the lexical context. If the declarator has a C++ 4589 // scope specifier, or is the object of a friend declaration, the 4590 // lexical context will be different from the semantic context. 4591 NewFD->setLexicalDeclContext(CurContext); 4592 4593 // Match up the template parameter lists with the scope specifier, then 4594 // determine whether we have a template or a template specialization. 4595 bool Invalid = false; 4596 if (TemplateParameterList *TemplateParams 4597 = MatchTemplateParametersToScopeSpecifier( 4598 D.getDeclSpec().getSourceRange().getBegin(), 4599 D.getIdentifierLoc(), 4600 D.getCXXScopeSpec(), 4601 TemplateParamLists.get(), 4602 TemplateParamLists.size(), 4603 isFriend, 4604 isExplicitSpecialization, 4605 Invalid)) { 4606 if (TemplateParams->size() > 0) { 4607 // This is a function template 4608 4609 // Check that we can declare a template here. 4610 if (CheckTemplateDeclScope(S, TemplateParams)) 4611 return 0; 4612 4613 // A destructor cannot be a template. 4614 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4615 Diag(NewFD->getLocation(), diag::err_destructor_template); 4616 return 0; 4617 } 4618 4619 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4620 NewFD->getLocation(), 4621 Name, TemplateParams, 4622 NewFD); 4623 FunctionTemplate->setLexicalDeclContext(CurContext); 4624 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4625 4626 // For source fidelity, store the other template param lists. 4627 if (TemplateParamLists.size() > 1) { 4628 NewFD->setTemplateParameterListsInfo(Context, 4629 TemplateParamLists.size() - 1, 4630 TemplateParamLists.release()); 4631 } 4632 } else { 4633 // This is a function template specialization. 4634 isFunctionTemplateSpecialization = true; 4635 // For source fidelity, store all the template param lists. 4636 NewFD->setTemplateParameterListsInfo(Context, 4637 TemplateParamLists.size(), 4638 TemplateParamLists.release()); 4639 4640 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4641 if (isFriend) { 4642 // We want to remove the "template<>", found here. 4643 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4644 4645 // If we remove the template<> and the name is not a 4646 // template-id, we're actually silently creating a problem: 4647 // the friend declaration will refer to an untemplated decl, 4648 // and clearly the user wants a template specialization. So 4649 // we need to insert '<>' after the name. 4650 SourceLocation InsertLoc; 4651 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4652 InsertLoc = D.getName().getSourceRange().getEnd(); 4653 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4654 } 4655 4656 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4657 << Name << RemoveRange 4658 << FixItHint::CreateRemoval(RemoveRange) 4659 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4660 } 4661 } 4662 } 4663 else { 4664 // All template param lists were matched against the scope specifier: 4665 // this is NOT (an explicit specialization of) a template. 4666 if (TemplateParamLists.size() > 0) 4667 // For source fidelity, store all the template param lists. 4668 NewFD->setTemplateParameterListsInfo(Context, 4669 TemplateParamLists.size(), 4670 TemplateParamLists.release()); 4671 } 4672 4673 if (Invalid) { 4674 NewFD->setInvalidDecl(); 4675 if (FunctionTemplate) 4676 FunctionTemplate->setInvalidDecl(); 4677 } 4678 4679 // C++ [dcl.fct.spec]p5: 4680 // The virtual specifier shall only be used in declarations of 4681 // nonstatic class member functions that appear within a 4682 // member-specification of a class declaration; see 10.3. 4683 // 4684 if (isVirtual && !NewFD->isInvalidDecl()) { 4685 if (!isVirtualOkay) { 4686 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4687 diag::err_virtual_non_function); 4688 } else if (!CurContext->isRecord()) { 4689 // 'virtual' was specified outside of the class. 4690 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4691 diag::err_virtual_out_of_class) 4692 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4693 } else if (NewFD->getDescribedFunctionTemplate()) { 4694 // C++ [temp.mem]p3: 4695 // A member function template shall not be virtual. 4696 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4697 diag::err_virtual_member_function_template) 4698 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4699 } else { 4700 // Okay: Add virtual to the method. 4701 NewFD->setVirtualAsWritten(true); 4702 } 4703 } 4704 4705 // C++ [dcl.fct.spec]p3: 4706 // The inline specifier shall not appear on a block scope function declaration. 4707 if (isInline && !NewFD->isInvalidDecl()) { 4708 if (CurContext->isFunctionOrMethod()) { 4709 // 'inline' is not allowed on block scope function declaration. 4710 Diag(D.getDeclSpec().getInlineSpecLoc(), 4711 diag::err_inline_declaration_block_scope) << Name 4712 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4713 } 4714 } 4715 4716 // C++ [dcl.fct.spec]p6: 4717 // The explicit specifier shall be used only in the declaration of a 4718 // constructor or conversion function within its class definition; see 12.3.1 4719 // and 12.3.2. 4720 if (isExplicit && !NewFD->isInvalidDecl()) { 4721 if (!CurContext->isRecord()) { 4722 // 'explicit' was specified outside of the class. 4723 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4724 diag::err_explicit_out_of_class) 4725 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4726 } else if (!isa<CXXConstructorDecl>(NewFD) && 4727 !isa<CXXConversionDecl>(NewFD)) { 4728 // 'explicit' was specified on a function that wasn't a constructor 4729 // or conversion function. 4730 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4731 diag::err_explicit_non_ctor_or_conv_function) 4732 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4733 } 4734 } 4735 4736 if (isConstexpr) { 4737 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4738 // are implicitly inline. 4739 NewFD->setImplicitlyInline(); 4740 4741 // FIXME: If this is a redeclaration, check the original declaration was 4742 // marked constepr. 4743 4744 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4745 // be either constructors or to return a literal type. Therefore, 4746 // destructors cannot be declared constexpr. 4747 if (isa<CXXDestructorDecl>(NewFD)) 4748 Diag(D.getDeclSpec().getConstexprSpecLoc(), 4749 diag::err_constexpr_dtor); 4750 } 4751 4752 // If __module_private__ was specified, mark the function accordingly. 4753 if (D.getDeclSpec().isModulePrivateSpecified()) { 4754 if (isFunctionTemplateSpecialization) { 4755 SourceLocation ModulePrivateLoc 4756 = D.getDeclSpec().getModulePrivateSpecLoc(); 4757 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4758 << 0 4759 << FixItHint::CreateRemoval(ModulePrivateLoc); 4760 } else { 4761 NewFD->setModulePrivate(); 4762 if (FunctionTemplate) 4763 FunctionTemplate->setModulePrivate(); 4764 } 4765 } 4766 4767 // Filter out previous declarations that don't match the scope. 4768 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4769 isExplicitSpecialization || 4770 isFunctionTemplateSpecialization); 4771 4772 if (isFriend) { 4773 // For now, claim that the objects have no previous declaration. 4774 if (FunctionTemplate) { 4775 FunctionTemplate->setObjectOfFriendDecl(false); 4776 FunctionTemplate->setAccess(AS_public); 4777 } 4778 NewFD->setObjectOfFriendDecl(false); 4779 NewFD->setAccess(AS_public); 4780 } 4781 4782 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 4783 // A method is implicitly inline if it's defined in its class 4784 // definition. 4785 NewFD->setImplicitlyInline(); 4786 } 4787 4788 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4789 !CurContext->isRecord()) { 4790 // C++ [class.static]p1: 4791 // A data or function member of a class may be declared static 4792 // in a class definition, in which case it is a static member of 4793 // the class. 4794 4795 // Complain about the 'static' specifier if it's on an out-of-line 4796 // member function definition. 4797 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4798 diag::err_static_out_of_line) 4799 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4800 } 4801 } 4802 4803 // Handle GNU asm-label extension (encoded as an attribute). 4804 if (Expr *E = (Expr*) D.getAsmLabel()) { 4805 // The parser guarantees this is a string. 4806 StringLiteral *SE = cast<StringLiteral>(E); 4807 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 4808 SE->getString())); 4809 } 4810 4811 // Copy the parameter declarations from the declarator D to the function 4812 // declaration NewFD, if they are available. First scavenge them into Params. 4813 SmallVector<ParmVarDecl*, 16> Params; 4814 if (D.isFunctionDeclarator()) { 4815 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4816 4817 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 4818 // function that takes no arguments, not a function that takes a 4819 // single void argument. 4820 // We let through "const void" here because Sema::GetTypeForDeclarator 4821 // already checks for that case. 4822 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4823 FTI.ArgInfo[0].Param && 4824 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 4825 // Empty arg list, don't push any params. 4826 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 4827 4828 // In C++, the empty parameter-type-list must be spelled "void"; a 4829 // typedef of void is not permitted. 4830 if (getLangOptions().CPlusPlus && 4831 Param->getType().getUnqualifiedType() != Context.VoidTy) { 4832 bool IsTypeAlias = false; 4833 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 4834 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 4835 else if (const TemplateSpecializationType *TST = 4836 Param->getType()->getAs<TemplateSpecializationType>()) 4837 IsTypeAlias = TST->isTypeAlias(); 4838 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 4839 << IsTypeAlias; 4840 } 4841 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 4842 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 4843 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 4844 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 4845 Param->setDeclContext(NewFD); 4846 Params.push_back(Param); 4847 4848 if (Param->isInvalidDecl()) 4849 NewFD->setInvalidDecl(); 4850 } 4851 } 4852 4853 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 4854 // When we're declaring a function with a typedef, typeof, etc as in the 4855 // following example, we'll need to synthesize (unnamed) 4856 // parameters for use in the declaration. 4857 // 4858 // @code 4859 // typedef void fn(int); 4860 // fn f; 4861 // @endcode 4862 4863 // Synthesize a parameter for each argument type. 4864 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 4865 AE = FT->arg_type_end(); AI != AE; ++AI) { 4866 ParmVarDecl *Param = 4867 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 4868 Param->setScopeInfo(0, Params.size()); 4869 Params.push_back(Param); 4870 } 4871 } else { 4872 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 4873 "Should not need args for typedef of non-prototype fn"); 4874 } 4875 // Finally, we know we have the right number of parameters, install them. 4876 NewFD->setParams(Params.data(), Params.size()); 4877 4878 // Process the non-inheritable attributes on this declaration. 4879 ProcessDeclAttributes(S, NewFD, D, 4880 /*NonInheritable=*/true, /*Inheritable=*/false); 4881 4882 if (!getLangOptions().CPlusPlus) { 4883 // Perform semantic checking on the function declaration. 4884 bool isExplicitSpecialization=false; 4885 if (!NewFD->isInvalidDecl()) { 4886 if (NewFD->getResultType()->isVariablyModifiedType()) { 4887 // Functions returning a variably modified type violate C99 6.7.5.2p2 4888 // because all functions have linkage. 4889 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4890 NewFD->setInvalidDecl(); 4891 } else { 4892 if (NewFD->isMain()) 4893 CheckMain(NewFD, D.getDeclSpec()); 4894 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4895 Redeclaration); 4896 } 4897 } 4898 assert((NewFD->isInvalidDecl() || !Redeclaration || 4899 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4900 "previous declaration set still overloaded"); 4901 } else { 4902 // If the declarator is a template-id, translate the parser's template 4903 // argument list into our AST format. 4904 bool HasExplicitTemplateArgs = false; 4905 TemplateArgumentListInfo TemplateArgs; 4906 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 4907 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 4908 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 4909 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 4910 ASTTemplateArgsPtr TemplateArgsPtr(*this, 4911 TemplateId->getTemplateArgs(), 4912 TemplateId->NumArgs); 4913 translateTemplateArguments(TemplateArgsPtr, 4914 TemplateArgs); 4915 TemplateArgsPtr.release(); 4916 4917 HasExplicitTemplateArgs = true; 4918 4919 if (NewFD->isInvalidDecl()) { 4920 HasExplicitTemplateArgs = false; 4921 } else if (FunctionTemplate) { 4922 // Function template with explicit template arguments. 4923 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 4924 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 4925 4926 HasExplicitTemplateArgs = false; 4927 } else if (!isFunctionTemplateSpecialization && 4928 !D.getDeclSpec().isFriendSpecified()) { 4929 // We have encountered something that the user meant to be a 4930 // specialization (because it has explicitly-specified template 4931 // arguments) but that was not introduced with a "template<>" (or had 4932 // too few of them). 4933 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 4934 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 4935 << FixItHint::CreateInsertion( 4936 D.getDeclSpec().getSourceRange().getBegin(), 4937 "template<> "); 4938 isFunctionTemplateSpecialization = true; 4939 } else { 4940 // "friend void foo<>(int);" is an implicit specialization decl. 4941 isFunctionTemplateSpecialization = true; 4942 } 4943 } else if (isFriend && isFunctionTemplateSpecialization) { 4944 // This combination is only possible in a recovery case; the user 4945 // wrote something like: 4946 // template <> friend void foo(int); 4947 // which we're recovering from as if the user had written: 4948 // friend void foo<>(int); 4949 // Go ahead and fake up a template id. 4950 HasExplicitTemplateArgs = true; 4951 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 4952 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 4953 } 4954 4955 // If it's a friend (and only if it's a friend), it's possible 4956 // that either the specialized function type or the specialized 4957 // template is dependent, and therefore matching will fail. In 4958 // this case, don't check the specialization yet. 4959 if (isFunctionTemplateSpecialization && isFriend && 4960 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 4961 assert(HasExplicitTemplateArgs && 4962 "friend function specialization without template args"); 4963 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 4964 Previous)) 4965 NewFD->setInvalidDecl(); 4966 } else if (isFunctionTemplateSpecialization) { 4967 if (CurContext->isDependentContext() && CurContext->isRecord() 4968 && !isFriend) { 4969 isDependentClassScopeExplicitSpecialization = true; 4970 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 4971 diag::ext_function_specialization_in_class : 4972 diag::err_function_specialization_in_class) 4973 << NewFD->getDeclName(); 4974 } else if (CheckFunctionTemplateSpecialization(NewFD, 4975 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 4976 Previous)) 4977 NewFD->setInvalidDecl(); 4978 4979 // C++ [dcl.stc]p1: 4980 // A storage-class-specifier shall not be specified in an explicit 4981 // specialization (14.7.3) 4982 if (SC != SC_None) { 4983 if (SC != NewFD->getStorageClass()) 4984 Diag(NewFD->getLocation(), 4985 diag::err_explicit_specialization_inconsistent_storage_class) 4986 << SC 4987 << FixItHint::CreateRemoval( 4988 D.getDeclSpec().getStorageClassSpecLoc()); 4989 4990 else 4991 Diag(NewFD->getLocation(), 4992 diag::ext_explicit_specialization_storage_class) 4993 << FixItHint::CreateRemoval( 4994 D.getDeclSpec().getStorageClassSpecLoc()); 4995 } 4996 4997 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 4998 if (CheckMemberSpecialization(NewFD, Previous)) 4999 NewFD->setInvalidDecl(); 5000 } 5001 5002 // Perform semantic checking on the function declaration. 5003 if (!isDependentClassScopeExplicitSpecialization) { 5004 if (NewFD->isInvalidDecl()) { 5005 // If this is a class member, mark the class invalid immediately. 5006 // This avoids some consistency errors later. 5007 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5008 methodDecl->getParent()->setInvalidDecl(); 5009 } else { 5010 if (NewFD->isMain()) 5011 CheckMain(NewFD, D.getDeclSpec()); 5012 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 5013 Redeclaration); 5014 } 5015 } 5016 5017 assert((NewFD->isInvalidDecl() || !Redeclaration || 5018 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5019 "previous declaration set still overloaded"); 5020 5021 NamedDecl *PrincipalDecl = (FunctionTemplate 5022 ? cast<NamedDecl>(FunctionTemplate) 5023 : NewFD); 5024 5025 if (isFriend && Redeclaration) { 5026 AccessSpecifier Access = AS_public; 5027 if (!NewFD->isInvalidDecl()) 5028 Access = NewFD->getPreviousDeclaration()->getAccess(); 5029 5030 NewFD->setAccess(Access); 5031 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5032 5033 PrincipalDecl->setObjectOfFriendDecl(true); 5034 } 5035 5036 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5037 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5038 PrincipalDecl->setNonMemberOperator(); 5039 5040 // If we have a function template, check the template parameter 5041 // list. This will check and merge default template arguments. 5042 if (FunctionTemplate) { 5043 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 5044 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5045 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 5046 D.getDeclSpec().isFriendSpecified() 5047 ? (IsFunctionDefinition 5048 ? TPC_FriendFunctionTemplateDefinition 5049 : TPC_FriendFunctionTemplate) 5050 : (D.getCXXScopeSpec().isSet() && 5051 DC && DC->isRecord() && 5052 DC->isDependentContext()) 5053 ? TPC_ClassTemplateMember 5054 : TPC_FunctionTemplate); 5055 } 5056 5057 if (NewFD->isInvalidDecl()) { 5058 // Ignore all the rest of this. 5059 } else if (!Redeclaration) { 5060 // Fake up an access specifier if it's supposed to be a class member. 5061 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5062 NewFD->setAccess(AS_public); 5063 5064 // Qualified decls generally require a previous declaration. 5065 if (D.getCXXScopeSpec().isSet()) { 5066 // ...with the major exception of templated-scope or 5067 // dependent-scope friend declarations. 5068 5069 // TODO: we currently also suppress this check in dependent 5070 // contexts because (1) the parameter depth will be off when 5071 // matching friend templates and (2) we might actually be 5072 // selecting a friend based on a dependent factor. But there 5073 // are situations where these conditions don't apply and we 5074 // can actually do this check immediately. 5075 if (isFriend && 5076 (TemplateParamLists.size() || 5077 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5078 CurContext->isDependentContext())) { 5079 // ignore these 5080 } else { 5081 // The user tried to provide an out-of-line definition for a 5082 // function that is a member of a class or namespace, but there 5083 // was no such member function declared (C++ [class.mfct]p2, 5084 // C++ [namespace.memdef]p2). For example: 5085 // 5086 // class X { 5087 // void f() const; 5088 // }; 5089 // 5090 // void X::f() { } // ill-formed 5091 // 5092 // Complain about this problem, and attempt to suggest close 5093 // matches (e.g., those that differ only in cv-qualifiers and 5094 // whether the parameter types are references). 5095 5096 DiagnoseInvalidRedeclaration(*this, NewFD, false); 5097 } 5098 5099 // Unqualified local friend declarations are required to resolve 5100 // to something. 5101 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5102 DiagnoseInvalidRedeclaration(*this, NewFD, true); 5103 } 5104 5105 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 5106 !isFriend && !isFunctionTemplateSpecialization && 5107 !isExplicitSpecialization) { 5108 // An out-of-line member function declaration must also be a 5109 // definition (C++ [dcl.meaning]p1). 5110 // Note that this is not the case for explicit specializations of 5111 // function templates or member functions of class templates, per 5112 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 5113 // for compatibility with old SWIG code which likes to generate them. 5114 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5115 << D.getCXXScopeSpec().getRange(); 5116 } 5117 } 5118 5119 5120 // Handle attributes. We need to have merged decls when handling attributes 5121 // (for example to check for conflicts, etc). 5122 // FIXME: This needs to happen before we merge declarations. Then, 5123 // let attribute merging cope with attribute conflicts. 5124 ProcessDeclAttributes(S, NewFD, D, 5125 /*NonInheritable=*/false, /*Inheritable=*/true); 5126 5127 // attributes declared post-definition are currently ignored 5128 // FIXME: This should happen during attribute merging 5129 if (Redeclaration && Previous.isSingleResult()) { 5130 const FunctionDecl *Def; 5131 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5132 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5133 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5134 Diag(Def->getLocation(), diag::note_previous_definition); 5135 } 5136 } 5137 5138 AddKnownFunctionAttributes(NewFD); 5139 5140 if (NewFD->hasAttr<OverloadableAttr>() && 5141 !NewFD->getType()->getAs<FunctionProtoType>()) { 5142 Diag(NewFD->getLocation(), 5143 diag::err_attribute_overloadable_no_prototype) 5144 << NewFD; 5145 5146 // Turn this into a variadic function with no parameters. 5147 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5148 FunctionProtoType::ExtProtoInfo EPI; 5149 EPI.Variadic = true; 5150 EPI.ExtInfo = FT->getExtInfo(); 5151 5152 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5153 NewFD->setType(R); 5154 } 5155 5156 // If there's a #pragma GCC visibility in scope, and this isn't a class 5157 // member, set the visibility of this function. 5158 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5159 AddPushedVisibilityAttribute(NewFD); 5160 5161 // If this is a locally-scoped extern C function, update the 5162 // map of such names. 5163 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5164 && !NewFD->isInvalidDecl()) 5165 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5166 5167 // Set this FunctionDecl's range up to the right paren. 5168 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5169 5170 if (getLangOptions().CPlusPlus) { 5171 if (FunctionTemplate) { 5172 if (NewFD->isInvalidDecl()) 5173 FunctionTemplate->setInvalidDecl(); 5174 return FunctionTemplate; 5175 } 5176 } 5177 5178 MarkUnusedFileScopedDecl(NewFD); 5179 5180 if (getLangOptions().CUDA) 5181 if (IdentifierInfo *II = NewFD->getIdentifier()) 5182 if (!NewFD->isInvalidDecl() && 5183 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5184 if (II->isStr("cudaConfigureCall")) { 5185 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5186 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5187 5188 Context.setcudaConfigureCallDecl(NewFD); 5189 } 5190 } 5191 5192 // Here we have an function template explicit specialization at class scope. 5193 // The actually specialization will be postponed to template instatiation 5194 // time via the ClassScopeFunctionSpecializationDecl node. 5195 if (isDependentClassScopeExplicitSpecialization) { 5196 ClassScopeFunctionSpecializationDecl *NewSpec = 5197 ClassScopeFunctionSpecializationDecl::Create( 5198 Context, CurContext, SourceLocation(), 5199 cast<CXXMethodDecl>(NewFD)); 5200 CurContext->addDecl(NewSpec); 5201 AddToScope = false; 5202 } 5203 5204 return NewFD; 5205} 5206 5207/// \brief Perform semantic checking of a new function declaration. 5208/// 5209/// Performs semantic analysis of the new function declaration 5210/// NewFD. This routine performs all semantic checking that does not 5211/// require the actual declarator involved in the declaration, and is 5212/// used both for the declaration of functions as they are parsed 5213/// (called via ActOnDeclarator) and for the declaration of functions 5214/// that have been instantiated via C++ template instantiation (called 5215/// via InstantiateDecl). 5216/// 5217/// \param IsExplicitSpecialiation whether this new function declaration is 5218/// an explicit specialization of the previous declaration. 5219/// 5220/// This sets NewFD->isInvalidDecl() to true if there was an error. 5221void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5222 LookupResult &Previous, 5223 bool IsExplicitSpecialization, 5224 bool &Redeclaration) { 5225 assert(!NewFD->getResultType()->isVariablyModifiedType() 5226 && "Variably modified return types are not handled here"); 5227 5228 // Check for a previous declaration of this name. 5229 if (Previous.empty() && NewFD->isExternC()) { 5230 // Since we did not find anything by this name and we're declaring 5231 // an extern "C" function, look for a non-visible extern "C" 5232 // declaration with the same name. 5233 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5234 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5235 if (Pos != LocallyScopedExternalDecls.end()) 5236 Previous.addDecl(Pos->second); 5237 } 5238 5239 // Merge or overload the declaration with an existing declaration of 5240 // the same name, if appropriate. 5241 if (!Previous.empty()) { 5242 // Determine whether NewFD is an overload of PrevDecl or 5243 // a declaration that requires merging. If it's an overload, 5244 // there's no more work to do here; we'll just add the new 5245 // function to the scope. 5246 5247 NamedDecl *OldDecl = 0; 5248 if (!AllowOverloadingOfFunction(Previous, Context)) { 5249 Redeclaration = true; 5250 OldDecl = Previous.getFoundDecl(); 5251 } else { 5252 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5253 /*NewIsUsingDecl*/ false)) { 5254 case Ovl_Match: 5255 Redeclaration = true; 5256 break; 5257 5258 case Ovl_NonFunction: 5259 Redeclaration = true; 5260 break; 5261 5262 case Ovl_Overload: 5263 Redeclaration = false; 5264 break; 5265 } 5266 5267 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5268 // If a function name is overloadable in C, then every function 5269 // with that name must be marked "overloadable". 5270 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5271 << Redeclaration << NewFD; 5272 NamedDecl *OverloadedDecl = 0; 5273 if (Redeclaration) 5274 OverloadedDecl = OldDecl; 5275 else if (!Previous.empty()) 5276 OverloadedDecl = Previous.getRepresentativeDecl(); 5277 if (OverloadedDecl) 5278 Diag(OverloadedDecl->getLocation(), 5279 diag::note_attribute_overloadable_prev_overload); 5280 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5281 Context)); 5282 } 5283 } 5284 5285 if (Redeclaration) { 5286 // NewFD and OldDecl represent declarations that need to be 5287 // merged. 5288 if (MergeFunctionDecl(NewFD, OldDecl)) 5289 return NewFD->setInvalidDecl(); 5290 5291 Previous.clear(); 5292 Previous.addDecl(OldDecl); 5293 5294 if (FunctionTemplateDecl *OldTemplateDecl 5295 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5296 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5297 FunctionTemplateDecl *NewTemplateDecl 5298 = NewFD->getDescribedFunctionTemplate(); 5299 assert(NewTemplateDecl && "Template/non-template mismatch"); 5300 if (CXXMethodDecl *Method 5301 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5302 Method->setAccess(OldTemplateDecl->getAccess()); 5303 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5304 } 5305 5306 // If this is an explicit specialization of a member that is a function 5307 // template, mark it as a member specialization. 5308 if (IsExplicitSpecialization && 5309 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5310 NewTemplateDecl->setMemberSpecialization(); 5311 assert(OldTemplateDecl->isMemberSpecialization()); 5312 } 5313 5314 if (OldTemplateDecl->isModulePrivate()) 5315 NewTemplateDecl->setModulePrivate(); 5316 5317 } else { 5318 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5319 NewFD->setAccess(OldDecl->getAccess()); 5320 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5321 } 5322 } 5323 } 5324 5325 // Semantic checking for this function declaration (in isolation). 5326 if (getLangOptions().CPlusPlus) { 5327 // C++-specific checks. 5328 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5329 CheckConstructor(Constructor); 5330 } else if (CXXDestructorDecl *Destructor = 5331 dyn_cast<CXXDestructorDecl>(NewFD)) { 5332 CXXRecordDecl *Record = Destructor->getParent(); 5333 QualType ClassType = Context.getTypeDeclType(Record); 5334 5335 // FIXME: Shouldn't we be able to perform this check even when the class 5336 // type is dependent? Both gcc and edg can handle that. 5337 if (!ClassType->isDependentType()) { 5338 DeclarationName Name 5339 = Context.DeclarationNames.getCXXDestructorName( 5340 Context.getCanonicalType(ClassType)); 5341 if (NewFD->getDeclName() != Name) { 5342 Diag(NewFD->getLocation(), diag::err_destructor_name); 5343 return NewFD->setInvalidDecl(); 5344 } 5345 } 5346 } else if (CXXConversionDecl *Conversion 5347 = dyn_cast<CXXConversionDecl>(NewFD)) { 5348 ActOnConversionDeclarator(Conversion); 5349 } 5350 5351 // Find any virtual functions that this function overrides. 5352 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5353 if (!Method->isFunctionTemplateSpecialization() && 5354 !Method->getDescribedFunctionTemplate()) { 5355 if (AddOverriddenMethods(Method->getParent(), Method)) { 5356 // If the function was marked as "static", we have a problem. 5357 if (NewFD->getStorageClass() == SC_Static) { 5358 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5359 << NewFD->getDeclName(); 5360 for (CXXMethodDecl::method_iterator 5361 Overridden = Method->begin_overridden_methods(), 5362 OverriddenEnd = Method->end_overridden_methods(); 5363 Overridden != OverriddenEnd; 5364 ++Overridden) { 5365 Diag((*Overridden)->getLocation(), 5366 diag::note_overridden_virtual_function); 5367 } 5368 } 5369 } 5370 } 5371 } 5372 5373 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5374 if (NewFD->isOverloadedOperator() && 5375 CheckOverloadedOperatorDeclaration(NewFD)) 5376 return NewFD->setInvalidDecl(); 5377 5378 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5379 if (NewFD->getLiteralIdentifier() && 5380 CheckLiteralOperatorDeclaration(NewFD)) 5381 return NewFD->setInvalidDecl(); 5382 5383 // In C++, check default arguments now that we have merged decls. Unless 5384 // the lexical context is the class, because in this case this is done 5385 // during delayed parsing anyway. 5386 if (!CurContext->isRecord()) 5387 CheckCXXDefaultArguments(NewFD); 5388 5389 // If this function declares a builtin function, check the type of this 5390 // declaration against the expected type for the builtin. 5391 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5392 ASTContext::GetBuiltinTypeError Error; 5393 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5394 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5395 // The type of this function differs from the type of the builtin, 5396 // so forget about the builtin entirely. 5397 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5398 } 5399 } 5400 } 5401} 5402 5403void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5404 // C++ [basic.start.main]p3: A program that declares main to be inline 5405 // or static is ill-formed. 5406 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5407 // shall not appear in a declaration of main. 5408 // static main is not an error under C99, but we should warn about it. 5409 if (FD->getStorageClass() == SC_Static) 5410 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5411 ? diag::err_static_main : diag::warn_static_main) 5412 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5413 if (FD->isInlineSpecified()) 5414 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5415 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5416 5417 QualType T = FD->getType(); 5418 assert(T->isFunctionType() && "function decl is not of function type"); 5419 const FunctionType* FT = T->getAs<FunctionType>(); 5420 5421 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5422 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5423 FD->setInvalidDecl(true); 5424 } 5425 5426 // Treat protoless main() as nullary. 5427 if (isa<FunctionNoProtoType>(FT)) return; 5428 5429 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5430 unsigned nparams = FTP->getNumArgs(); 5431 assert(FD->getNumParams() == nparams); 5432 5433 bool HasExtraParameters = (nparams > 3); 5434 5435 // Darwin passes an undocumented fourth argument of type char**. If 5436 // other platforms start sprouting these, the logic below will start 5437 // getting shifty. 5438 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5439 HasExtraParameters = false; 5440 5441 if (HasExtraParameters) { 5442 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5443 FD->setInvalidDecl(true); 5444 nparams = 3; 5445 } 5446 5447 // FIXME: a lot of the following diagnostics would be improved 5448 // if we had some location information about types. 5449 5450 QualType CharPP = 5451 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5452 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5453 5454 for (unsigned i = 0; i < nparams; ++i) { 5455 QualType AT = FTP->getArgType(i); 5456 5457 bool mismatch = true; 5458 5459 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5460 mismatch = false; 5461 else if (Expected[i] == CharPP) { 5462 // As an extension, the following forms are okay: 5463 // char const ** 5464 // char const * const * 5465 // char * const * 5466 5467 QualifierCollector qs; 5468 const PointerType* PT; 5469 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5470 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5471 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5472 qs.removeConst(); 5473 mismatch = !qs.empty(); 5474 } 5475 } 5476 5477 if (mismatch) { 5478 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5479 // TODO: suggest replacing given type with expected type 5480 FD->setInvalidDecl(true); 5481 } 5482 } 5483 5484 if (nparams == 1 && !FD->isInvalidDecl()) { 5485 Diag(FD->getLocation(), diag::warn_main_one_arg); 5486 } 5487 5488 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5489 Diag(FD->getLocation(), diag::err_main_template_decl); 5490 FD->setInvalidDecl(); 5491 } 5492} 5493 5494bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5495 // FIXME: Need strict checking. In C89, we need to check for 5496 // any assignment, increment, decrement, function-calls, or 5497 // commas outside of a sizeof. In C99, it's the same list, 5498 // except that the aforementioned are allowed in unevaluated 5499 // expressions. Everything else falls under the 5500 // "may accept other forms of constant expressions" exception. 5501 // (We never end up here for C++, so the constant expression 5502 // rules there don't matter.) 5503 if (Init->isConstantInitializer(Context, false)) 5504 return false; 5505 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5506 << Init->getSourceRange(); 5507 return true; 5508} 5509 5510namespace { 5511 // Visits an initialization expression to see if OrigDecl is evaluated in 5512 // its own initialization and throws a warning if it does. 5513 class SelfReferenceChecker 5514 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5515 Sema &S; 5516 Decl *OrigDecl; 5517 bool isRecordType; 5518 bool isPODType; 5519 5520 public: 5521 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5522 5523 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5524 S(S), OrigDecl(OrigDecl) { 5525 isPODType = false; 5526 isRecordType = false; 5527 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5528 isPODType = VD->getType().isPODType(S.Context); 5529 isRecordType = VD->getType()->isRecordType(); 5530 } 5531 } 5532 5533 void VisitExpr(Expr *E) { 5534 if (isa<ObjCMessageExpr>(*E)) return; 5535 if (isRecordType) { 5536 Expr *expr = E; 5537 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5538 ValueDecl *VD = ME->getMemberDecl(); 5539 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5540 expr = ME->getBase(); 5541 } 5542 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5543 HandleDeclRefExpr(DRE); 5544 return; 5545 } 5546 } 5547 Inherited::VisitExpr(E); 5548 } 5549 5550 void VisitMemberExpr(MemberExpr *E) { 5551 if (E->getType()->canDecayToPointerType()) return; 5552 if (isa<FieldDecl>(E->getMemberDecl())) 5553 if (DeclRefExpr *DRE 5554 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5555 HandleDeclRefExpr(DRE); 5556 return; 5557 } 5558 Inherited::VisitMemberExpr(E); 5559 } 5560 5561 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5562 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5563 (isRecordType && E->getCastKind() == CK_NoOp)) { 5564 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5565 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5566 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5567 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5568 HandleDeclRefExpr(DRE); 5569 return; 5570 } 5571 } 5572 Inherited::VisitImplicitCastExpr(E); 5573 } 5574 5575 void VisitUnaryOperator(UnaryOperator *E) { 5576 // For POD record types, addresses of its own members are well-defined. 5577 if (isRecordType && isPODType) return; 5578 Inherited::VisitUnaryOperator(E); 5579 } 5580 5581 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5582 Decl* ReferenceDecl = DRE->getDecl(); 5583 if (OrigDecl != ReferenceDecl) return; 5584 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5585 Sema::NotForRedeclaration); 5586 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5587 S.PDiag(diag::warn_uninit_self_reference_in_init) 5588 << Result.getLookupName() 5589 << OrigDecl->getLocation() 5590 << DRE->getSourceRange()); 5591 } 5592 }; 5593} 5594 5595/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5596void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5597 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5598} 5599 5600/// AddInitializerToDecl - Adds the initializer Init to the 5601/// declaration dcl. If DirectInit is true, this is C++ direct 5602/// initialization rather than copy initialization. 5603void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5604 bool DirectInit, bool TypeMayContainAuto) { 5605 // If there is no declaration, there was an error parsing it. Just ignore 5606 // the initializer. 5607 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5608 return; 5609 5610 // Check for self-references within variable initializers. 5611 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5612 // Variables declared within a function/method body are handled 5613 // by a dataflow analysis. 5614 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5615 CheckSelfReference(RealDecl, Init); 5616 } 5617 else { 5618 CheckSelfReference(RealDecl, Init); 5619 } 5620 5621 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5622 // With declarators parsed the way they are, the parser cannot 5623 // distinguish between a normal initializer and a pure-specifier. 5624 // Thus this grotesque test. 5625 IntegerLiteral *IL; 5626 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5627 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5628 CheckPureMethod(Method, Init->getSourceRange()); 5629 else { 5630 Diag(Method->getLocation(), diag::err_member_function_initialization) 5631 << Method->getDeclName() << Init->getSourceRange(); 5632 Method->setInvalidDecl(); 5633 } 5634 return; 5635 } 5636 5637 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5638 if (!VDecl) { 5639 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5640 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5641 RealDecl->setInvalidDecl(); 5642 return; 5643 } 5644 5645 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5646 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5647 TypeSourceInfo *DeducedType = 0; 5648 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5649 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5650 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5651 << Init->getSourceRange(); 5652 if (!DeducedType) { 5653 RealDecl->setInvalidDecl(); 5654 return; 5655 } 5656 VDecl->setTypeSourceInfo(DeducedType); 5657 VDecl->setType(DeducedType->getType()); 5658 5659 // In ARC, infer lifetime. 5660 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5661 VDecl->setInvalidDecl(); 5662 5663 // If this is a redeclaration, check that the type we just deduced matches 5664 // the previously declared type. 5665 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5666 MergeVarDeclTypes(VDecl, Old); 5667 } 5668 5669 5670 // A definition must end up with a complete type, which means it must be 5671 // complete with the restriction that an array type might be completed by the 5672 // initializer; note that later code assumes this restriction. 5673 QualType BaseDeclType = VDecl->getType(); 5674 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5675 BaseDeclType = Array->getElementType(); 5676 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5677 diag::err_typecheck_decl_incomplete_type)) { 5678 RealDecl->setInvalidDecl(); 5679 return; 5680 } 5681 5682 // The variable can not have an abstract class type. 5683 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5684 diag::err_abstract_type_in_decl, 5685 AbstractVariableType)) 5686 VDecl->setInvalidDecl(); 5687 5688 const VarDecl *Def; 5689 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5690 Diag(VDecl->getLocation(), diag::err_redefinition) 5691 << VDecl->getDeclName(); 5692 Diag(Def->getLocation(), diag::note_previous_definition); 5693 VDecl->setInvalidDecl(); 5694 return; 5695 } 5696 5697 const VarDecl* PrevInit = 0; 5698 if (getLangOptions().CPlusPlus) { 5699 // C++ [class.static.data]p4 5700 // If a static data member is of const integral or const 5701 // enumeration type, its declaration in the class definition can 5702 // specify a constant-initializer which shall be an integral 5703 // constant expression (5.19). In that case, the member can appear 5704 // in integral constant expressions. The member shall still be 5705 // defined in a namespace scope if it is used in the program and the 5706 // namespace scope definition shall not contain an initializer. 5707 // 5708 // We already performed a redefinition check above, but for static 5709 // data members we also need to check whether there was an in-class 5710 // declaration with an initializer. 5711 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5712 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5713 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5714 return; 5715 } 5716 5717 if (VDecl->hasLocalStorage()) 5718 getCurFunction()->setHasBranchProtectedScope(); 5719 5720 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5721 VDecl->setInvalidDecl(); 5722 return; 5723 } 5724 } 5725 5726 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 5727 // a kernel function cannot be initialized." 5728 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 5729 Diag(VDecl->getLocation(), diag::err_local_cant_init); 5730 VDecl->setInvalidDecl(); 5731 return; 5732 } 5733 5734 // Capture the variable that is being initialized and the style of 5735 // initialization. 5736 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5737 5738 // FIXME: Poor source location information. 5739 InitializationKind Kind 5740 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5741 Init->getLocStart(), 5742 Init->getLocEnd()) 5743 : InitializationKind::CreateCopy(VDecl->getLocation(), 5744 Init->getLocStart()); 5745 5746 // Get the decls type and save a reference for later, since 5747 // CheckInitializerTypes may change it. 5748 QualType DclT = VDecl->getType(), SavT = DclT; 5749 if (VDecl->isLocalVarDecl()) { 5750 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5751 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5752 VDecl->setInvalidDecl(); 5753 } else if (!VDecl->isInvalidDecl()) { 5754 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5755 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5756 MultiExprArg(*this, &Init, 1), 5757 &DclT); 5758 if (Result.isInvalid()) { 5759 VDecl->setInvalidDecl(); 5760 return; 5761 } 5762 5763 Init = Result.takeAs<Expr>(); 5764 5765 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5766 // Don't check invalid declarations to avoid emitting useless diagnostics. 5767 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5768 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 5769 CheckForConstantInitializer(Init, DclT); 5770 } 5771 } 5772 } else if (VDecl->isStaticDataMember() && 5773 VDecl->getLexicalDeclContext()->isRecord()) { 5774 // This is an in-class initialization for a static data member, e.g., 5775 // 5776 // struct S { 5777 // static const int value = 17; 5778 // }; 5779 5780 // Try to perform the initialization regardless. 5781 if (!VDecl->isInvalidDecl()) { 5782 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5783 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5784 MultiExprArg(*this, &Init, 1), 5785 &DclT); 5786 if (Result.isInvalid()) { 5787 VDecl->setInvalidDecl(); 5788 return; 5789 } 5790 5791 Init = Result.takeAs<Expr>(); 5792 } 5793 5794 // C++ [class.mem]p4: 5795 // A member-declarator can contain a constant-initializer only 5796 // if it declares a static member (9.4) of const integral or 5797 // const enumeration type, see 9.4.2. 5798 QualType T = VDecl->getType(); 5799 5800 // Do nothing on dependent types. 5801 if (T->isDependentType()) { 5802 5803 // Require constness. 5804 } else if (!T.isConstQualified()) { 5805 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 5806 << Init->getSourceRange(); 5807 VDecl->setInvalidDecl(); 5808 5809 // We allow integer constant expressions in all cases. 5810 } else if (T->isIntegralOrEnumerationType()) { 5811 // Check whether the expression is a constant expression. 5812 SourceLocation Loc; 5813 if (Init->isValueDependent()) 5814 ; // Nothing to check. 5815 else if (Init->isIntegerConstantExpr(Context, &Loc)) 5816 ; // Ok, it's an ICE! 5817 else if (Init->isEvaluatable(Context)) { 5818 // If we can constant fold the initializer through heroics, accept it, 5819 // but report this as a use of an extension for -pedantic. 5820 Diag(Loc, diag::ext_in_class_initializer_non_constant) 5821 << Init->getSourceRange(); 5822 } else { 5823 // Otherwise, this is some crazy unknown case. Report the issue at the 5824 // location provided by the isIntegerConstantExpr failed check. 5825 Diag(Loc, diag::err_in_class_initializer_non_constant) 5826 << Init->getSourceRange(); 5827 VDecl->setInvalidDecl(); 5828 } 5829 5830 // We allow floating-point constants as an extension in C++03, and 5831 // C++0x has far more complicated rules that we don't really 5832 // implement fully. 5833 } else { 5834 bool Allowed = false; 5835 if (getLangOptions().CPlusPlus0x) { 5836 Allowed = T->isLiteralType(); 5837 } else if (T->isFloatingType()) { // also permits complex, which is ok 5838 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 5839 << T << Init->getSourceRange(); 5840 Allowed = true; 5841 } 5842 5843 if (!Allowed) { 5844 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 5845 << T << Init->getSourceRange(); 5846 VDecl->setInvalidDecl(); 5847 5848 // TODO: there are probably expressions that pass here that shouldn't. 5849 } else if (!Init->isValueDependent() && 5850 !Init->isConstantInitializer(Context, false)) { 5851 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 5852 << Init->getSourceRange(); 5853 VDecl->setInvalidDecl(); 5854 } 5855 } 5856 } else if (VDecl->isFileVarDecl()) { 5857 if (VDecl->getStorageClassAsWritten() == SC_Extern && 5858 (!getLangOptions().CPlusPlus || 5859 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 5860 Diag(VDecl->getLocation(), diag::warn_extern_init); 5861 if (!VDecl->isInvalidDecl()) { 5862 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5863 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5864 MultiExprArg(*this, &Init, 1), 5865 &DclT); 5866 if (Result.isInvalid()) { 5867 VDecl->setInvalidDecl(); 5868 return; 5869 } 5870 5871 Init = Result.takeAs<Expr>(); 5872 } 5873 5874 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5875 // Don't check invalid declarations to avoid emitting useless diagnostics. 5876 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5877 // C99 6.7.8p4. All file scoped initializers need to be constant. 5878 CheckForConstantInitializer(Init, DclT); 5879 } 5880 } 5881 // If the type changed, it means we had an incomplete type that was 5882 // completed by the initializer. For example: 5883 // int ary[] = { 1, 3, 5 }; 5884 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 5885 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 5886 VDecl->setType(DclT); 5887 Init->setType(DclT); 5888 } 5889 5890 // Check any implicit conversions within the expression. 5891 CheckImplicitConversions(Init, VDecl->getLocation()); 5892 5893 if (!VDecl->isInvalidDecl()) 5894 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 5895 5896 Init = MaybeCreateExprWithCleanups(Init); 5897 // Attach the initializer to the decl. 5898 VDecl->setInit(Init); 5899 5900 CheckCompleteVariableDeclaration(VDecl); 5901} 5902 5903/// ActOnInitializerError - Given that there was an error parsing an 5904/// initializer for the given declaration, try to return to some form 5905/// of sanity. 5906void Sema::ActOnInitializerError(Decl *D) { 5907 // Our main concern here is re-establishing invariants like "a 5908 // variable's type is either dependent or complete". 5909 if (!D || D->isInvalidDecl()) return; 5910 5911 VarDecl *VD = dyn_cast<VarDecl>(D); 5912 if (!VD) return; 5913 5914 // Auto types are meaningless if we can't make sense of the initializer. 5915 if (ParsingInitForAutoVars.count(D)) { 5916 D->setInvalidDecl(); 5917 return; 5918 } 5919 5920 QualType Ty = VD->getType(); 5921 if (Ty->isDependentType()) return; 5922 5923 // Require a complete type. 5924 if (RequireCompleteType(VD->getLocation(), 5925 Context.getBaseElementType(Ty), 5926 diag::err_typecheck_decl_incomplete_type)) { 5927 VD->setInvalidDecl(); 5928 return; 5929 } 5930 5931 // Require an abstract type. 5932 if (RequireNonAbstractType(VD->getLocation(), Ty, 5933 diag::err_abstract_type_in_decl, 5934 AbstractVariableType)) { 5935 VD->setInvalidDecl(); 5936 return; 5937 } 5938 5939 // Don't bother complaining about constructors or destructors, 5940 // though. 5941} 5942 5943void Sema::ActOnUninitializedDecl(Decl *RealDecl, 5944 bool TypeMayContainAuto) { 5945 // If there is no declaration, there was an error parsing it. Just ignore it. 5946 if (RealDecl == 0) 5947 return; 5948 5949 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 5950 QualType Type = Var->getType(); 5951 5952 // C++0x [dcl.spec.auto]p3 5953 if (TypeMayContainAuto && Type->getContainedAutoType()) { 5954 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 5955 << Var->getDeclName() << Type; 5956 Var->setInvalidDecl(); 5957 return; 5958 } 5959 5960 switch (Var->isThisDeclarationADefinition()) { 5961 case VarDecl::Definition: 5962 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 5963 break; 5964 5965 // We have an out-of-line definition of a static data member 5966 // that has an in-class initializer, so we type-check this like 5967 // a declaration. 5968 // 5969 // Fall through 5970 5971 case VarDecl::DeclarationOnly: 5972 // It's only a declaration. 5973 5974 // Block scope. C99 6.7p7: If an identifier for an object is 5975 // declared with no linkage (C99 6.2.2p6), the type for the 5976 // object shall be complete. 5977 if (!Type->isDependentType() && Var->isLocalVarDecl() && 5978 !Var->getLinkage() && !Var->isInvalidDecl() && 5979 RequireCompleteType(Var->getLocation(), Type, 5980 diag::err_typecheck_decl_incomplete_type)) 5981 Var->setInvalidDecl(); 5982 5983 // Make sure that the type is not abstract. 5984 if (!Type->isDependentType() && !Var->isInvalidDecl() && 5985 RequireNonAbstractType(Var->getLocation(), Type, 5986 diag::err_abstract_type_in_decl, 5987 AbstractVariableType)) 5988 Var->setInvalidDecl(); 5989 return; 5990 5991 case VarDecl::TentativeDefinition: 5992 // File scope. C99 6.9.2p2: A declaration of an identifier for an 5993 // object that has file scope without an initializer, and without a 5994 // storage-class specifier or with the storage-class specifier "static", 5995 // constitutes a tentative definition. Note: A tentative definition with 5996 // external linkage is valid (C99 6.2.2p5). 5997 if (!Var->isInvalidDecl()) { 5998 if (const IncompleteArrayType *ArrayT 5999 = Context.getAsIncompleteArrayType(Type)) { 6000 if (RequireCompleteType(Var->getLocation(), 6001 ArrayT->getElementType(), 6002 diag::err_illegal_decl_array_incomplete_type)) 6003 Var->setInvalidDecl(); 6004 } else if (Var->getStorageClass() == SC_Static) { 6005 // C99 6.9.2p3: If the declaration of an identifier for an object is 6006 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6007 // declared type shall not be an incomplete type. 6008 // NOTE: code such as the following 6009 // static struct s; 6010 // struct s { int a; }; 6011 // is accepted by gcc. Hence here we issue a warning instead of 6012 // an error and we do not invalidate the static declaration. 6013 // NOTE: to avoid multiple warnings, only check the first declaration. 6014 if (Var->getPreviousDeclaration() == 0) 6015 RequireCompleteType(Var->getLocation(), Type, 6016 diag::ext_typecheck_decl_incomplete_type); 6017 } 6018 } 6019 6020 // Record the tentative definition; we're done. 6021 if (!Var->isInvalidDecl()) 6022 TentativeDefinitions.push_back(Var); 6023 return; 6024 } 6025 6026 // Provide a specific diagnostic for uninitialized variable 6027 // definitions with incomplete array type. 6028 if (Type->isIncompleteArrayType()) { 6029 Diag(Var->getLocation(), 6030 diag::err_typecheck_incomplete_array_needs_initializer); 6031 Var->setInvalidDecl(); 6032 return; 6033 } 6034 6035 // Provide a specific diagnostic for uninitialized variable 6036 // definitions with reference type. 6037 if (Type->isReferenceType()) { 6038 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6039 << Var->getDeclName() 6040 << SourceRange(Var->getLocation(), Var->getLocation()); 6041 Var->setInvalidDecl(); 6042 return; 6043 } 6044 6045 // Do not attempt to type-check the default initializer for a 6046 // variable with dependent type. 6047 if (Type->isDependentType()) 6048 return; 6049 6050 if (Var->isInvalidDecl()) 6051 return; 6052 6053 if (RequireCompleteType(Var->getLocation(), 6054 Context.getBaseElementType(Type), 6055 diag::err_typecheck_decl_incomplete_type)) { 6056 Var->setInvalidDecl(); 6057 return; 6058 } 6059 6060 // The variable can not have an abstract class type. 6061 if (RequireNonAbstractType(Var->getLocation(), Type, 6062 diag::err_abstract_type_in_decl, 6063 AbstractVariableType)) { 6064 Var->setInvalidDecl(); 6065 return; 6066 } 6067 6068 // Check for jumps past the implicit initializer. C++0x 6069 // clarifies that this applies to a "variable with automatic 6070 // storage duration", not a "local variable". 6071 // C++0x [stmt.dcl]p3 6072 // A program that jumps from a point where a variable with automatic 6073 // storage duration is not in scope to a point where it is in scope is 6074 // ill-formed unless the variable has scalar type, class type with a 6075 // trivial default constructor and a trivial destructor, a cv-qualified 6076 // version of one of these types, or an array of one of the preceding 6077 // types and is declared without an initializer. 6078 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6079 if (const RecordType *Record 6080 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6081 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6082 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) || 6083 (getLangOptions().CPlusPlus0x && 6084 (!CXXRecord->hasTrivialDefaultConstructor() || 6085 !CXXRecord->hasTrivialDestructor()))) 6086 getCurFunction()->setHasBranchProtectedScope(); 6087 } 6088 } 6089 6090 // C++03 [dcl.init]p9: 6091 // If no initializer is specified for an object, and the 6092 // object is of (possibly cv-qualified) non-POD class type (or 6093 // array thereof), the object shall be default-initialized; if 6094 // the object is of const-qualified type, the underlying class 6095 // type shall have a user-declared default 6096 // constructor. Otherwise, if no initializer is specified for 6097 // a non- static object, the object and its subobjects, if 6098 // any, have an indeterminate initial value); if the object 6099 // or any of its subobjects are of const-qualified type, the 6100 // program is ill-formed. 6101 // C++0x [dcl.init]p11: 6102 // If no initializer is specified for an object, the object is 6103 // default-initialized; [...]. 6104 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6105 InitializationKind Kind 6106 = InitializationKind::CreateDefault(Var->getLocation()); 6107 6108 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6109 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6110 MultiExprArg(*this, 0, 0)); 6111 if (Init.isInvalid()) 6112 Var->setInvalidDecl(); 6113 else if (Init.get()) 6114 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6115 6116 CheckCompleteVariableDeclaration(Var); 6117 } 6118} 6119 6120void Sema::ActOnCXXForRangeDecl(Decl *D) { 6121 VarDecl *VD = dyn_cast<VarDecl>(D); 6122 if (!VD) { 6123 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6124 D->setInvalidDecl(); 6125 return; 6126 } 6127 6128 VD->setCXXForRangeDecl(true); 6129 6130 // for-range-declaration cannot be given a storage class specifier. 6131 int Error = -1; 6132 switch (VD->getStorageClassAsWritten()) { 6133 case SC_None: 6134 break; 6135 case SC_Extern: 6136 Error = 0; 6137 break; 6138 case SC_Static: 6139 Error = 1; 6140 break; 6141 case SC_PrivateExtern: 6142 Error = 2; 6143 break; 6144 case SC_Auto: 6145 Error = 3; 6146 break; 6147 case SC_Register: 6148 Error = 4; 6149 break; 6150 case SC_OpenCLWorkGroupLocal: 6151 llvm_unreachable("Unexpected storage class"); 6152 } 6153 // FIXME: constexpr isn't allowed here. 6154 //if (DS.isConstexprSpecified()) 6155 // Error = 5; 6156 if (Error != -1) { 6157 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6158 << VD->getDeclName() << Error; 6159 D->setInvalidDecl(); 6160 } 6161} 6162 6163void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6164 if (var->isInvalidDecl()) return; 6165 6166 // In ARC, don't allow jumps past the implicit initialization of a 6167 // local retaining variable. 6168 if (getLangOptions().ObjCAutoRefCount && 6169 var->hasLocalStorage()) { 6170 switch (var->getType().getObjCLifetime()) { 6171 case Qualifiers::OCL_None: 6172 case Qualifiers::OCL_ExplicitNone: 6173 case Qualifiers::OCL_Autoreleasing: 6174 break; 6175 6176 case Qualifiers::OCL_Weak: 6177 case Qualifiers::OCL_Strong: 6178 getCurFunction()->setHasBranchProtectedScope(); 6179 break; 6180 } 6181 } 6182 6183 // All the following checks are C++ only. 6184 if (!getLangOptions().CPlusPlus) return; 6185 6186 QualType baseType = Context.getBaseElementType(var->getType()); 6187 if (baseType->isDependentType()) return; 6188 6189 // __block variables might require us to capture a copy-initializer. 6190 if (var->hasAttr<BlocksAttr>()) { 6191 // It's currently invalid to ever have a __block variable with an 6192 // array type; should we diagnose that here? 6193 6194 // Regardless, we don't want to ignore array nesting when 6195 // constructing this copy. 6196 QualType type = var->getType(); 6197 6198 if (type->isStructureOrClassType()) { 6199 SourceLocation poi = var->getLocation(); 6200 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6201 ExprResult result = 6202 PerformCopyInitialization( 6203 InitializedEntity::InitializeBlock(poi, type, false), 6204 poi, Owned(varRef)); 6205 if (!result.isInvalid()) { 6206 result = MaybeCreateExprWithCleanups(result); 6207 Expr *init = result.takeAs<Expr>(); 6208 Context.setBlockVarCopyInits(var, init); 6209 } 6210 } 6211 } 6212 6213 // Check for global constructors. 6214 if (!var->getDeclContext()->isDependentContext() && 6215 var->hasGlobalStorage() && 6216 !var->isStaticLocal() && 6217 var->getInit() && 6218 !var->getInit()->isConstantInitializer(Context, 6219 baseType->isReferenceType())) 6220 Diag(var->getLocation(), diag::warn_global_constructor) 6221 << var->getInit()->getSourceRange(); 6222 6223 // Require the destructor. 6224 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6225 FinalizeVarWithDestructor(var, recordType); 6226} 6227 6228/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6229/// any semantic actions necessary after any initializer has been attached. 6230void 6231Sema::FinalizeDeclaration(Decl *ThisDecl) { 6232 // Note that we are no longer parsing the initializer for this declaration. 6233 ParsingInitForAutoVars.erase(ThisDecl); 6234} 6235 6236Sema::DeclGroupPtrTy 6237Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6238 Decl **Group, unsigned NumDecls) { 6239 SmallVector<Decl*, 8> Decls; 6240 6241 if (DS.isTypeSpecOwned()) 6242 Decls.push_back(DS.getRepAsDecl()); 6243 6244 for (unsigned i = 0; i != NumDecls; ++i) 6245 if (Decl *D = Group[i]) 6246 Decls.push_back(D); 6247 6248 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6249 DS.getTypeSpecType() == DeclSpec::TST_auto); 6250} 6251 6252/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6253/// group, performing any necessary semantic checking. 6254Sema::DeclGroupPtrTy 6255Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6256 bool TypeMayContainAuto) { 6257 // C++0x [dcl.spec.auto]p7: 6258 // If the type deduced for the template parameter U is not the same in each 6259 // deduction, the program is ill-formed. 6260 // FIXME: When initializer-list support is added, a distinction is needed 6261 // between the deduced type U and the deduced type which 'auto' stands for. 6262 // auto a = 0, b = { 1, 2, 3 }; 6263 // is legal because the deduced type U is 'int' in both cases. 6264 if (TypeMayContainAuto && NumDecls > 1) { 6265 QualType Deduced; 6266 CanQualType DeducedCanon; 6267 VarDecl *DeducedDecl = 0; 6268 for (unsigned i = 0; i != NumDecls; ++i) { 6269 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6270 AutoType *AT = D->getType()->getContainedAutoType(); 6271 // Don't reissue diagnostics when instantiating a template. 6272 if (AT && D->isInvalidDecl()) 6273 break; 6274 if (AT && AT->isDeduced()) { 6275 QualType U = AT->getDeducedType(); 6276 CanQualType UCanon = Context.getCanonicalType(U); 6277 if (Deduced.isNull()) { 6278 Deduced = U; 6279 DeducedCanon = UCanon; 6280 DeducedDecl = D; 6281 } else if (DeducedCanon != UCanon) { 6282 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6283 diag::err_auto_different_deductions) 6284 << Deduced << DeducedDecl->getDeclName() 6285 << U << D->getDeclName() 6286 << DeducedDecl->getInit()->getSourceRange() 6287 << D->getInit()->getSourceRange(); 6288 D->setInvalidDecl(); 6289 break; 6290 } 6291 } 6292 } 6293 } 6294 } 6295 6296 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6297} 6298 6299 6300/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6301/// to introduce parameters into function prototype scope. 6302Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6303 const DeclSpec &DS = D.getDeclSpec(); 6304 6305 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6306 VarDecl::StorageClass StorageClass = SC_None; 6307 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6308 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6309 StorageClass = SC_Register; 6310 StorageClassAsWritten = SC_Register; 6311 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6312 Diag(DS.getStorageClassSpecLoc(), 6313 diag::err_invalid_storage_class_in_func_decl); 6314 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6315 } 6316 6317 if (D.getDeclSpec().isThreadSpecified()) 6318 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6319 if (D.getDeclSpec().isConstexprSpecified()) 6320 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6321 << 0; 6322 6323 DiagnoseFunctionSpecifiers(D); 6324 6325 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6326 QualType parmDeclType = TInfo->getType(); 6327 6328 if (getLangOptions().CPlusPlus) { 6329 // Check that there are no default arguments inside the type of this 6330 // parameter. 6331 CheckExtraCXXDefaultArguments(D); 6332 6333 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6334 if (D.getCXXScopeSpec().isSet()) { 6335 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6336 << D.getCXXScopeSpec().getRange(); 6337 D.getCXXScopeSpec().clear(); 6338 } 6339 } 6340 6341 // Ensure we have a valid name 6342 IdentifierInfo *II = 0; 6343 if (D.hasName()) { 6344 II = D.getIdentifier(); 6345 if (!II) { 6346 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6347 << GetNameForDeclarator(D).getName().getAsString(); 6348 D.setInvalidType(true); 6349 } 6350 } 6351 6352 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6353 if (II) { 6354 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6355 ForRedeclaration); 6356 LookupName(R, S); 6357 if (R.isSingleResult()) { 6358 NamedDecl *PrevDecl = R.getFoundDecl(); 6359 if (PrevDecl->isTemplateParameter()) { 6360 // Maybe we will complain about the shadowed template parameter. 6361 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6362 // Just pretend that we didn't see the previous declaration. 6363 PrevDecl = 0; 6364 } else if (S->isDeclScope(PrevDecl)) { 6365 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6366 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6367 6368 // Recover by removing the name 6369 II = 0; 6370 D.SetIdentifier(0, D.getIdentifierLoc()); 6371 D.setInvalidType(true); 6372 } 6373 } 6374 } 6375 6376 // Temporarily put parameter variables in the translation unit, not 6377 // the enclosing context. This prevents them from accidentally 6378 // looking like class members in C++. 6379 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6380 D.getSourceRange().getBegin(), 6381 D.getIdentifierLoc(), II, 6382 parmDeclType, TInfo, 6383 StorageClass, StorageClassAsWritten); 6384 6385 if (D.isInvalidType()) 6386 New->setInvalidDecl(); 6387 6388 assert(S->isFunctionPrototypeScope()); 6389 assert(S->getFunctionPrototypeDepth() >= 1); 6390 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6391 S->getNextFunctionPrototypeIndex()); 6392 6393 // Add the parameter declaration into this scope. 6394 S->AddDecl(New); 6395 if (II) 6396 IdResolver.AddDecl(New); 6397 6398 ProcessDeclAttributes(S, New, D); 6399 6400 if (D.getDeclSpec().isModulePrivateSpecified()) 6401 Diag(New->getLocation(), diag::err_module_private_local) 6402 << 1 << New->getDeclName() 6403 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6404 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6405 6406 if (New->hasAttr<BlocksAttr>()) { 6407 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6408 } 6409 return New; 6410} 6411 6412/// \brief Synthesizes a variable for a parameter arising from a 6413/// typedef. 6414ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6415 SourceLocation Loc, 6416 QualType T) { 6417 /* FIXME: setting StartLoc == Loc. 6418 Would it be worth to modify callers so as to provide proper source 6419 location for the unnamed parameters, embedding the parameter's type? */ 6420 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6421 T, Context.getTrivialTypeSourceInfo(T, Loc), 6422 SC_None, SC_None, 0); 6423 Param->setImplicit(); 6424 return Param; 6425} 6426 6427void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6428 ParmVarDecl * const *ParamEnd) { 6429 // Don't diagnose unused-parameter errors in template instantiations; we 6430 // will already have done so in the template itself. 6431 if (!ActiveTemplateInstantiations.empty()) 6432 return; 6433 6434 for (; Param != ParamEnd; ++Param) { 6435 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6436 !(*Param)->hasAttr<UnusedAttr>()) { 6437 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6438 << (*Param)->getDeclName(); 6439 } 6440 } 6441} 6442 6443void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6444 ParmVarDecl * const *ParamEnd, 6445 QualType ReturnTy, 6446 NamedDecl *D) { 6447 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6448 return; 6449 6450 // Warn if the return value is pass-by-value and larger than the specified 6451 // threshold. 6452 if (ReturnTy.isPODType(Context)) { 6453 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6454 if (Size > LangOpts.NumLargeByValueCopy) 6455 Diag(D->getLocation(), diag::warn_return_value_size) 6456 << D->getDeclName() << Size; 6457 } 6458 6459 // Warn if any parameter is pass-by-value and larger than the specified 6460 // threshold. 6461 for (; Param != ParamEnd; ++Param) { 6462 QualType T = (*Param)->getType(); 6463 if (!T.isPODType(Context)) 6464 continue; 6465 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6466 if (Size > LangOpts.NumLargeByValueCopy) 6467 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6468 << (*Param)->getDeclName() << Size; 6469 } 6470} 6471 6472ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6473 SourceLocation NameLoc, IdentifierInfo *Name, 6474 QualType T, TypeSourceInfo *TSInfo, 6475 VarDecl::StorageClass StorageClass, 6476 VarDecl::StorageClass StorageClassAsWritten) { 6477 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6478 if (getLangOptions().ObjCAutoRefCount && 6479 T.getObjCLifetime() == Qualifiers::OCL_None && 6480 T->isObjCLifetimeType()) { 6481 6482 Qualifiers::ObjCLifetime lifetime; 6483 6484 // Special cases for arrays: 6485 // - if it's const, use __unsafe_unretained 6486 // - otherwise, it's an error 6487 if (T->isArrayType()) { 6488 if (!T.isConstQualified()) { 6489 Diag(NameLoc, diag::err_arc_array_param_no_ownership) 6490 << TSInfo->getTypeLoc().getSourceRange(); 6491 } 6492 lifetime = Qualifiers::OCL_ExplicitNone; 6493 } else { 6494 lifetime = T->getObjCARCImplicitLifetime(); 6495 } 6496 T = Context.getLifetimeQualifiedType(T, lifetime); 6497 } 6498 6499 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6500 Context.getAdjustedParameterType(T), 6501 TSInfo, 6502 StorageClass, StorageClassAsWritten, 6503 0); 6504 6505 // Parameters can not be abstract class types. 6506 // For record types, this is done by the AbstractClassUsageDiagnoser once 6507 // the class has been completely parsed. 6508 if (!CurContext->isRecord() && 6509 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6510 AbstractParamType)) 6511 New->setInvalidDecl(); 6512 6513 // Parameter declarators cannot be interface types. All ObjC objects are 6514 // passed by reference. 6515 if (T->isObjCObjectType()) { 6516 Diag(NameLoc, 6517 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6518 << FixItHint::CreateInsertion(NameLoc, "*"); 6519 T = Context.getObjCObjectPointerType(T); 6520 New->setType(T); 6521 } 6522 6523 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6524 // duration shall not be qualified by an address-space qualifier." 6525 // Since all parameters have automatic store duration, they can not have 6526 // an address space. 6527 if (T.getAddressSpace() != 0) { 6528 Diag(NameLoc, diag::err_arg_with_address_space); 6529 New->setInvalidDecl(); 6530 } 6531 6532 return New; 6533} 6534 6535void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6536 SourceLocation LocAfterDecls) { 6537 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6538 6539 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6540 // for a K&R function. 6541 if (!FTI.hasPrototype) { 6542 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6543 --i; 6544 if (FTI.ArgInfo[i].Param == 0) { 6545 llvm::SmallString<256> Code; 6546 llvm::raw_svector_ostream(Code) << " int " 6547 << FTI.ArgInfo[i].Ident->getName() 6548 << ";\n"; 6549 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6550 << FTI.ArgInfo[i].Ident 6551 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6552 6553 // Implicitly declare the argument as type 'int' for lack of a better 6554 // type. 6555 AttributeFactory attrs; 6556 DeclSpec DS(attrs); 6557 const char* PrevSpec; // unused 6558 unsigned DiagID; // unused 6559 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6560 PrevSpec, DiagID); 6561 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6562 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6563 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6564 } 6565 } 6566 } 6567} 6568 6569Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6570 Declarator &D) { 6571 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6572 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6573 Scope *ParentScope = FnBodyScope->getParent(); 6574 6575 Decl *DP = HandleDeclarator(ParentScope, D, 6576 MultiTemplateParamsArg(*this), 6577 /*IsFunctionDefinition=*/true); 6578 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6579} 6580 6581static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6582 // Don't warn about invalid declarations. 6583 if (FD->isInvalidDecl()) 6584 return false; 6585 6586 // Or declarations that aren't global. 6587 if (!FD->isGlobal()) 6588 return false; 6589 6590 // Don't warn about C++ member functions. 6591 if (isa<CXXMethodDecl>(FD)) 6592 return false; 6593 6594 // Don't warn about 'main'. 6595 if (FD->isMain()) 6596 return false; 6597 6598 // Don't warn about inline functions. 6599 if (FD->isInlined()) 6600 return false; 6601 6602 // Don't warn about function templates. 6603 if (FD->getDescribedFunctionTemplate()) 6604 return false; 6605 6606 // Don't warn about function template specializations. 6607 if (FD->isFunctionTemplateSpecialization()) 6608 return false; 6609 6610 bool MissingPrototype = true; 6611 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6612 Prev; Prev = Prev->getPreviousDeclaration()) { 6613 // Ignore any declarations that occur in function or method 6614 // scope, because they aren't visible from the header. 6615 if (Prev->getDeclContext()->isFunctionOrMethod()) 6616 continue; 6617 6618 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6619 break; 6620 } 6621 6622 return MissingPrototype; 6623} 6624 6625void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6626 // Don't complain if we're in GNU89 mode and the previous definition 6627 // was an extern inline function. 6628 const FunctionDecl *Definition; 6629 if (FD->isDefined(Definition) && 6630 !canRedefineFunction(Definition, getLangOptions())) { 6631 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6632 Definition->getStorageClass() == SC_Extern) 6633 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6634 << FD->getDeclName() << getLangOptions().CPlusPlus; 6635 else 6636 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6637 Diag(Definition->getLocation(), diag::note_previous_definition); 6638 } 6639} 6640 6641Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6642 // Clear the last template instantiation error context. 6643 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6644 6645 if (!D) 6646 return D; 6647 FunctionDecl *FD = 0; 6648 6649 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6650 FD = FunTmpl->getTemplatedDecl(); 6651 else 6652 FD = cast<FunctionDecl>(D); 6653 6654 // Enter a new function scope 6655 PushFunctionScope(); 6656 6657 // See if this is a redefinition. 6658 if (!FD->isLateTemplateParsed()) 6659 CheckForFunctionRedefinition(FD); 6660 6661 // Builtin functions cannot be defined. 6662 if (unsigned BuiltinID = FD->getBuiltinID()) { 6663 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6664 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6665 FD->setInvalidDecl(); 6666 } 6667 } 6668 6669 // The return type of a function definition must be complete 6670 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6671 QualType ResultType = FD->getResultType(); 6672 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6673 !FD->isInvalidDecl() && 6674 RequireCompleteType(FD->getLocation(), ResultType, 6675 diag::err_func_def_incomplete_result)) 6676 FD->setInvalidDecl(); 6677 6678 // GNU warning -Wmissing-prototypes: 6679 // Warn if a global function is defined without a previous 6680 // prototype declaration. This warning is issued even if the 6681 // definition itself provides a prototype. The aim is to detect 6682 // global functions that fail to be declared in header files. 6683 if (ShouldWarnAboutMissingPrototype(FD)) 6684 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6685 6686 if (FnBodyScope) 6687 PushDeclContext(FnBodyScope, FD); 6688 6689 // Check the validity of our function parameters 6690 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6691 /*CheckParameterNames=*/true); 6692 6693 // Introduce our parameters into the function scope 6694 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6695 ParmVarDecl *Param = FD->getParamDecl(p); 6696 Param->setOwningFunction(FD); 6697 6698 // If this has an identifier, add it to the scope stack. 6699 if (Param->getIdentifier() && FnBodyScope) { 6700 CheckShadow(FnBodyScope, Param); 6701 6702 PushOnScopeChains(Param, FnBodyScope); 6703 } 6704 } 6705 6706 // Checking attributes of current function definition 6707 // dllimport attribute. 6708 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6709 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6710 // dllimport attribute cannot be directly applied to definition. 6711 // Microsoft accepts dllimport for functions defined within class scope. 6712 if (!DA->isInherited() && 6713 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 6714 Diag(FD->getLocation(), 6715 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6716 << "dllimport"; 6717 FD->setInvalidDecl(); 6718 return FD; 6719 } 6720 6721 // Visual C++ appears to not think this is an issue, so only issue 6722 // a warning when Microsoft extensions are disabled. 6723 if (!LangOpts.MicrosoftExt) { 6724 // If a symbol previously declared dllimport is later defined, the 6725 // attribute is ignored in subsequent references, and a warning is 6726 // emitted. 6727 Diag(FD->getLocation(), 6728 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 6729 << FD->getName() << "dllimport"; 6730 } 6731 } 6732 return FD; 6733} 6734 6735/// \brief Given the set of return statements within a function body, 6736/// compute the variables that are subject to the named return value 6737/// optimization. 6738/// 6739/// Each of the variables that is subject to the named return value 6740/// optimization will be marked as NRVO variables in the AST, and any 6741/// return statement that has a marked NRVO variable as its NRVO candidate can 6742/// use the named return value optimization. 6743/// 6744/// This function applies a very simplistic algorithm for NRVO: if every return 6745/// statement in the function has the same NRVO candidate, that candidate is 6746/// the NRVO variable. 6747/// 6748/// FIXME: Employ a smarter algorithm that accounts for multiple return 6749/// statements and the lifetimes of the NRVO candidates. We should be able to 6750/// find a maximal set of NRVO variables. 6751void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 6752 ReturnStmt **Returns = Scope->Returns.data(); 6753 6754 const VarDecl *NRVOCandidate = 0; 6755 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 6756 if (!Returns[I]->getNRVOCandidate()) 6757 return; 6758 6759 if (!NRVOCandidate) 6760 NRVOCandidate = Returns[I]->getNRVOCandidate(); 6761 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 6762 return; 6763 } 6764 6765 if (NRVOCandidate) 6766 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 6767} 6768 6769Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 6770 return ActOnFinishFunctionBody(D, move(BodyArg), false); 6771} 6772 6773Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 6774 bool IsInstantiation) { 6775 FunctionDecl *FD = 0; 6776 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 6777 if (FunTmpl) 6778 FD = FunTmpl->getTemplatedDecl(); 6779 else 6780 FD = dyn_cast_or_null<FunctionDecl>(dcl); 6781 6782 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 6783 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 6784 6785 if (FD) { 6786 FD->setBody(Body); 6787 if (FD->isMain()) { 6788 // C and C++ allow for main to automagically return 0. 6789 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6790 FD->setHasImplicitReturnZero(true); 6791 WP.disableCheckFallThrough(); 6792 } else if (FD->hasAttr<NakedAttr>()) { 6793 // If the function is marked 'naked', don't complain about missing return 6794 // statements. 6795 WP.disableCheckFallThrough(); 6796 } 6797 6798 // MSVC permits the use of pure specifier (=0) on function definition, 6799 // defined at class scope, warn about this non standard construct. 6800 if (getLangOptions().MicrosoftExt && FD->isPure()) 6801 Diag(FD->getLocation(), diag::warn_pure_function_definition); 6802 6803 if (!FD->isInvalidDecl()) { 6804 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 6805 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 6806 FD->getResultType(), FD); 6807 6808 // If this is a constructor, we need a vtable. 6809 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 6810 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 6811 6812 computeNRVO(Body, getCurFunction()); 6813 } 6814 6815 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 6816 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 6817 assert(MD == getCurMethodDecl() && "Method parsing confused"); 6818 MD->setBody(Body); 6819 if (Body) 6820 MD->setEndLoc(Body->getLocEnd()); 6821 if (!MD->isInvalidDecl()) { 6822 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 6823 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 6824 MD->getResultType(), MD); 6825 6826 if (Body) 6827 computeNRVO(Body, getCurFunction()); 6828 } 6829 if (ObjCShouldCallSuperDealloc) { 6830 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 6831 ObjCShouldCallSuperDealloc = false; 6832 } 6833 if (ObjCShouldCallSuperFinalize) { 6834 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 6835 ObjCShouldCallSuperFinalize = false; 6836 } 6837 } else { 6838 return 0; 6839 } 6840 6841 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 6842 "ObjC methods, which should have been handled in the block above."); 6843 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 6844 "ObjC methods, which should have been handled in the block above."); 6845 6846 // Verify and clean out per-function state. 6847 if (Body) { 6848 // C++ constructors that have function-try-blocks can't have return 6849 // statements in the handlers of that block. (C++ [except.handle]p14) 6850 // Verify this. 6851 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 6852 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 6853 6854 // Verify that gotos and switch cases don't jump into scopes illegally. 6855 if (getCurFunction()->NeedsScopeChecking() && 6856 !dcl->isInvalidDecl() && 6857 !hasAnyUnrecoverableErrorsInThisFunction()) 6858 DiagnoseInvalidJumps(Body); 6859 6860 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 6861 if (!Destructor->getParent()->isDependentType()) 6862 CheckDestructor(Destructor); 6863 6864 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6865 Destructor->getParent()); 6866 } 6867 6868 // If any errors have occurred, clear out any temporaries that may have 6869 // been leftover. This ensures that these temporaries won't be picked up for 6870 // deletion in some later function. 6871 if (PP.getDiagnostics().hasErrorOccurred() || 6872 PP.getDiagnostics().getSuppressAllDiagnostics()) { 6873 ExprTemporaries.clear(); 6874 ExprNeedsCleanups = false; 6875 } else if (!isa<FunctionTemplateDecl>(dcl)) { 6876 // Since the body is valid, issue any analysis-based warnings that are 6877 // enabled. 6878 ActivePolicy = &WP; 6879 } 6880 6881 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 6882 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 6883 } 6884 6885 if (!IsInstantiation) 6886 PopDeclContext(); 6887 6888 PopFunctionOrBlockScope(ActivePolicy, dcl); 6889 6890 // If any errors have occurred, clear out any temporaries that may have 6891 // been leftover. This ensures that these temporaries won't be picked up for 6892 // deletion in some later function. 6893 if (getDiagnostics().hasErrorOccurred()) { 6894 ExprTemporaries.clear(); 6895 ExprNeedsCleanups = false; 6896 } 6897 6898 return dcl; 6899} 6900 6901 6902/// When we finish delayed parsing of an attribute, we must attach it to the 6903/// relevant Decl. 6904void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 6905 ParsedAttributes &Attrs) { 6906 ProcessDeclAttributeList(S, D, Attrs.getList()); 6907} 6908 6909 6910/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 6911/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 6912NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 6913 IdentifierInfo &II, Scope *S) { 6914 // Before we produce a declaration for an implicitly defined 6915 // function, see whether there was a locally-scoped declaration of 6916 // this name as a function or variable. If so, use that 6917 // (non-visible) declaration, and complain about it. 6918 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 6919 = findLocallyScopedExternalDecl(&II); 6920 if (Pos != LocallyScopedExternalDecls.end()) { 6921 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 6922 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 6923 return Pos->second; 6924 } 6925 6926 // Extension in C99. Legal in C90, but warn about it. 6927 if (II.getName().startswith("__builtin_")) 6928 Diag(Loc, diag::warn_builtin_unknown) << &II; 6929 else if (getLangOptions().C99) 6930 Diag(Loc, diag::ext_implicit_function_decl) << &II; 6931 else 6932 Diag(Loc, diag::warn_implicit_function_decl) << &II; 6933 6934 // Set a Declarator for the implicit definition: int foo(); 6935 const char *Dummy; 6936 AttributeFactory attrFactory; 6937 DeclSpec DS(attrFactory); 6938 unsigned DiagID; 6939 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 6940 (void)Error; // Silence warning. 6941 assert(!Error && "Error setting up implicit decl!"); 6942 Declarator D(DS, Declarator::BlockContext); 6943 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 6944 0, 0, true, SourceLocation(), 6945 SourceLocation(), 6946 EST_None, SourceLocation(), 6947 0, 0, 0, 0, Loc, Loc, D), 6948 DS.getAttributes(), 6949 SourceLocation()); 6950 D.SetIdentifier(&II, Loc); 6951 6952 // Insert this function into translation-unit scope. 6953 6954 DeclContext *PrevDC = CurContext; 6955 CurContext = Context.getTranslationUnitDecl(); 6956 6957 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 6958 FD->setImplicit(); 6959 6960 CurContext = PrevDC; 6961 6962 AddKnownFunctionAttributes(FD); 6963 6964 return FD; 6965} 6966 6967/// \brief Adds any function attributes that we know a priori based on 6968/// the declaration of this function. 6969/// 6970/// These attributes can apply both to implicitly-declared builtins 6971/// (like __builtin___printf_chk) or to library-declared functions 6972/// like NSLog or printf. 6973/// 6974/// We need to check for duplicate attributes both here and where user-written 6975/// attributes are applied to declarations. 6976void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 6977 if (FD->isInvalidDecl()) 6978 return; 6979 6980 // If this is a built-in function, map its builtin attributes to 6981 // actual attributes. 6982 if (unsigned BuiltinID = FD->getBuiltinID()) { 6983 // Handle printf-formatting attributes. 6984 unsigned FormatIdx; 6985 bool HasVAListArg; 6986 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 6987 if (!FD->getAttr<FormatAttr>()) 6988 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6989 "printf", FormatIdx+1, 6990 HasVAListArg ? 0 : FormatIdx+2)); 6991 } 6992 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 6993 HasVAListArg)) { 6994 if (!FD->getAttr<FormatAttr>()) 6995 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6996 "scanf", FormatIdx+1, 6997 HasVAListArg ? 0 : FormatIdx+2)); 6998 } 6999 7000 // Mark const if we don't care about errno and that is the only 7001 // thing preventing the function from being const. This allows 7002 // IRgen to use LLVM intrinsics for such functions. 7003 if (!getLangOptions().MathErrno && 7004 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7005 if (!FD->getAttr<ConstAttr>()) 7006 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7007 } 7008 7009 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7010 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7011 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7012 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7013 } 7014 7015 IdentifierInfo *Name = FD->getIdentifier(); 7016 if (!Name) 7017 return; 7018 if ((!getLangOptions().CPlusPlus && 7019 FD->getDeclContext()->isTranslationUnit()) || 7020 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7021 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7022 LinkageSpecDecl::lang_c)) { 7023 // Okay: this could be a libc/libm/Objective-C function we know 7024 // about. 7025 } else 7026 return; 7027 7028 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7029 // FIXME: NSLog and NSLogv should be target specific 7030 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7031 // FIXME: We known better than our headers. 7032 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7033 } else 7034 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7035 "printf", 1, 7036 Name->isStr("NSLogv") ? 0 : 2)); 7037 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7038 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7039 // target-specific builtins, perhaps? 7040 if (!FD->getAttr<FormatAttr>()) 7041 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7042 "printf", 2, 7043 Name->isStr("vasprintf") ? 0 : 3)); 7044 } 7045} 7046 7047TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7048 TypeSourceInfo *TInfo) { 7049 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7050 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7051 7052 if (!TInfo) { 7053 assert(D.isInvalidType() && "no declarator info for valid type"); 7054 TInfo = Context.getTrivialTypeSourceInfo(T); 7055 } 7056 7057 // Scope manipulation handled by caller. 7058 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7059 D.getSourceRange().getBegin(), 7060 D.getIdentifierLoc(), 7061 D.getIdentifier(), 7062 TInfo); 7063 7064 // Bail out immediately if we have an invalid declaration. 7065 if (D.isInvalidType()) { 7066 NewTD->setInvalidDecl(); 7067 return NewTD; 7068 } 7069 7070 if (D.getDeclSpec().isModulePrivateSpecified()) { 7071 if (CurContext->isFunctionOrMethod()) 7072 Diag(NewTD->getLocation(), diag::err_module_private_local) 7073 << 2 << NewTD->getDeclName() 7074 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7075 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7076 else 7077 NewTD->setModulePrivate(); 7078 } 7079 7080 // C++ [dcl.typedef]p8: 7081 // If the typedef declaration defines an unnamed class (or 7082 // enum), the first typedef-name declared by the declaration 7083 // to be that class type (or enum type) is used to denote the 7084 // class type (or enum type) for linkage purposes only. 7085 // We need to check whether the type was declared in the declaration. 7086 switch (D.getDeclSpec().getTypeSpecType()) { 7087 case TST_enum: 7088 case TST_struct: 7089 case TST_union: 7090 case TST_class: { 7091 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7092 7093 // Do nothing if the tag is not anonymous or already has an 7094 // associated typedef (from an earlier typedef in this decl group). 7095 if (tagFromDeclSpec->getIdentifier()) break; 7096 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7097 7098 // A well-formed anonymous tag must always be a TUK_Definition. 7099 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7100 7101 // The type must match the tag exactly; no qualifiers allowed. 7102 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7103 break; 7104 7105 // Otherwise, set this is the anon-decl typedef for the tag. 7106 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7107 break; 7108 } 7109 7110 default: 7111 break; 7112 } 7113 7114 return NewTD; 7115} 7116 7117 7118/// \brief Determine whether a tag with a given kind is acceptable 7119/// as a redeclaration of the given tag declaration. 7120/// 7121/// \returns true if the new tag kind is acceptable, false otherwise. 7122bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7123 TagTypeKind NewTag, bool isDefinition, 7124 SourceLocation NewTagLoc, 7125 const IdentifierInfo &Name) { 7126 // C++ [dcl.type.elab]p3: 7127 // The class-key or enum keyword present in the 7128 // elaborated-type-specifier shall agree in kind with the 7129 // declaration to which the name in the elaborated-type-specifier 7130 // refers. This rule also applies to the form of 7131 // elaborated-type-specifier that declares a class-name or 7132 // friend class since it can be construed as referring to the 7133 // definition of the class. Thus, in any 7134 // elaborated-type-specifier, the enum keyword shall be used to 7135 // refer to an enumeration (7.2), the union class-key shall be 7136 // used to refer to a union (clause 9), and either the class or 7137 // struct class-key shall be used to refer to a class (clause 9) 7138 // declared using the class or struct class-key. 7139 TagTypeKind OldTag = Previous->getTagKind(); 7140 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7141 if (OldTag == NewTag) 7142 return true; 7143 7144 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7145 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7146 // Warn about the struct/class tag mismatch. 7147 bool isTemplate = false; 7148 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7149 isTemplate = Record->getDescribedClassTemplate(); 7150 7151 if (!ActiveTemplateInstantiations.empty()) { 7152 // In a template instantiation, do not offer fix-its for tag mismatches 7153 // since they usually mess up the template instead of fixing the problem. 7154 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7155 << (NewTag == TTK_Class) << isTemplate << &Name; 7156 return true; 7157 } 7158 7159 if (isDefinition) { 7160 // On definitions, check previous tags and issue a fix-it for each 7161 // one that doesn't match the current tag. 7162 if (Previous->getDefinition()) { 7163 // Don't suggest fix-its for redefinitions. 7164 return true; 7165 } 7166 7167 bool previousMismatch = false; 7168 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7169 E(Previous->redecls_end()); I != E; ++I) { 7170 if (I->getTagKind() != NewTag) { 7171 if (!previousMismatch) { 7172 previousMismatch = true; 7173 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7174 << (NewTag == TTK_Class) << isTemplate << &Name; 7175 } 7176 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7177 << (NewTag == TTK_Class) 7178 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7179 NewTag == TTK_Class? 7180 "class" : "struct"); 7181 } 7182 } 7183 return true; 7184 } 7185 7186 // Check for a previous definition. If current tag and definition 7187 // are same type, do nothing. If no definition, but disagree with 7188 // with previous tag type, give a warning, but no fix-it. 7189 const TagDecl *Redecl = Previous->getDefinition() ? 7190 Previous->getDefinition() : Previous; 7191 if (Redecl->getTagKind() == NewTag) { 7192 return true; 7193 } 7194 7195 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7196 << (NewTag == TTK_Class) 7197 << isTemplate << &Name; 7198 Diag(Redecl->getLocation(), diag::note_previous_use); 7199 7200 // If there is a previous defintion, suggest a fix-it. 7201 if (Previous->getDefinition()) { 7202 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7203 << (Redecl->getTagKind() == TTK_Class) 7204 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7205 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7206 } 7207 7208 return true; 7209 } 7210 return false; 7211} 7212 7213/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7214/// former case, Name will be non-null. In the later case, Name will be null. 7215/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7216/// reference/declaration/definition of a tag. 7217Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7218 SourceLocation KWLoc, CXXScopeSpec &SS, 7219 IdentifierInfo *Name, SourceLocation NameLoc, 7220 AttributeList *Attr, AccessSpecifier AS, 7221 SourceLocation ModulePrivateLoc, 7222 MultiTemplateParamsArg TemplateParameterLists, 7223 bool &OwnedDecl, bool &IsDependent, 7224 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7225 TypeResult UnderlyingType) { 7226 // If this is not a definition, it must have a name. 7227 assert((Name != 0 || TUK == TUK_Definition) && 7228 "Nameless record must be a definition!"); 7229 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7230 7231 OwnedDecl = false; 7232 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7233 7234 // FIXME: Check explicit specializations more carefully. 7235 bool isExplicitSpecialization = false; 7236 bool Invalid = false; 7237 7238 // We only need to do this matching if we have template parameters 7239 // or a scope specifier, which also conveniently avoids this work 7240 // for non-C++ cases. 7241 if (TemplateParameterLists.size() > 0 || 7242 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7243 if (TemplateParameterList *TemplateParams 7244 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7245 TemplateParameterLists.get(), 7246 TemplateParameterLists.size(), 7247 TUK == TUK_Friend, 7248 isExplicitSpecialization, 7249 Invalid)) { 7250 if (TemplateParams->size() > 0) { 7251 // This is a declaration or definition of a class template (which may 7252 // be a member of another template). 7253 7254 if (Invalid) 7255 return 0; 7256 7257 OwnedDecl = false; 7258 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7259 SS, Name, NameLoc, Attr, 7260 TemplateParams, AS, 7261 ModulePrivateLoc, 7262 TemplateParameterLists.size() - 1, 7263 (TemplateParameterList**) TemplateParameterLists.release()); 7264 return Result.get(); 7265 } else { 7266 // The "template<>" header is extraneous. 7267 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7268 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7269 isExplicitSpecialization = true; 7270 } 7271 } 7272 } 7273 7274 // Figure out the underlying type if this a enum declaration. We need to do 7275 // this early, because it's needed to detect if this is an incompatible 7276 // redeclaration. 7277 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7278 7279 if (Kind == TTK_Enum) { 7280 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7281 // No underlying type explicitly specified, or we failed to parse the 7282 // type, default to int. 7283 EnumUnderlying = Context.IntTy.getTypePtr(); 7284 else if (UnderlyingType.get()) { 7285 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7286 // integral type; any cv-qualification is ignored. 7287 TypeSourceInfo *TI = 0; 7288 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7289 EnumUnderlying = TI; 7290 7291 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7292 7293 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7294 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7295 << T; 7296 // Recover by falling back to int. 7297 EnumUnderlying = Context.IntTy.getTypePtr(); 7298 } 7299 7300 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7301 UPPC_FixedUnderlyingType)) 7302 EnumUnderlying = Context.IntTy.getTypePtr(); 7303 7304 } else if (getLangOptions().MicrosoftExt) 7305 // Microsoft enums are always of int type. 7306 EnumUnderlying = Context.IntTy.getTypePtr(); 7307 } 7308 7309 DeclContext *SearchDC = CurContext; 7310 DeclContext *DC = CurContext; 7311 bool isStdBadAlloc = false; 7312 7313 RedeclarationKind Redecl = ForRedeclaration; 7314 if (TUK == TUK_Friend || TUK == TUK_Reference) 7315 Redecl = NotForRedeclaration; 7316 7317 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7318 7319 if (Name && SS.isNotEmpty()) { 7320 // We have a nested-name tag ('struct foo::bar'). 7321 7322 // Check for invalid 'foo::'. 7323 if (SS.isInvalid()) { 7324 Name = 0; 7325 goto CreateNewDecl; 7326 } 7327 7328 // If this is a friend or a reference to a class in a dependent 7329 // context, don't try to make a decl for it. 7330 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7331 DC = computeDeclContext(SS, false); 7332 if (!DC) { 7333 IsDependent = true; 7334 return 0; 7335 } 7336 } else { 7337 DC = computeDeclContext(SS, true); 7338 if (!DC) { 7339 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7340 << SS.getRange(); 7341 return 0; 7342 } 7343 } 7344 7345 if (RequireCompleteDeclContext(SS, DC)) 7346 return 0; 7347 7348 SearchDC = DC; 7349 // Look-up name inside 'foo::'. 7350 LookupQualifiedName(Previous, DC); 7351 7352 if (Previous.isAmbiguous()) 7353 return 0; 7354 7355 if (Previous.empty()) { 7356 // Name lookup did not find anything. However, if the 7357 // nested-name-specifier refers to the current instantiation, 7358 // and that current instantiation has any dependent base 7359 // classes, we might find something at instantiation time: treat 7360 // this as a dependent elaborated-type-specifier. 7361 // But this only makes any sense for reference-like lookups. 7362 if (Previous.wasNotFoundInCurrentInstantiation() && 7363 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7364 IsDependent = true; 7365 return 0; 7366 } 7367 7368 // A tag 'foo::bar' must already exist. 7369 Diag(NameLoc, diag::err_not_tag_in_scope) 7370 << Kind << Name << DC << SS.getRange(); 7371 Name = 0; 7372 Invalid = true; 7373 goto CreateNewDecl; 7374 } 7375 } else if (Name) { 7376 // If this is a named struct, check to see if there was a previous forward 7377 // declaration or definition. 7378 // FIXME: We're looking into outer scopes here, even when we 7379 // shouldn't be. Doing so can result in ambiguities that we 7380 // shouldn't be diagnosing. 7381 LookupName(Previous, S); 7382 7383 if (Previous.isAmbiguous() && 7384 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7385 LookupResult::Filter F = Previous.makeFilter(); 7386 while (F.hasNext()) { 7387 NamedDecl *ND = F.next(); 7388 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7389 F.erase(); 7390 } 7391 F.done(); 7392 } 7393 7394 // Note: there used to be some attempt at recovery here. 7395 if (Previous.isAmbiguous()) 7396 return 0; 7397 7398 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7399 // FIXME: This makes sure that we ignore the contexts associated 7400 // with C structs, unions, and enums when looking for a matching 7401 // tag declaration or definition. See the similar lookup tweak 7402 // in Sema::LookupName; is there a better way to deal with this? 7403 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7404 SearchDC = SearchDC->getParent(); 7405 } 7406 } else if (S->isFunctionPrototypeScope()) { 7407 // If this is an enum declaration in function prototype scope, set its 7408 // initial context to the translation unit. 7409 SearchDC = Context.getTranslationUnitDecl(); 7410 } 7411 7412 if (Previous.isSingleResult() && 7413 Previous.getFoundDecl()->isTemplateParameter()) { 7414 // Maybe we will complain about the shadowed template parameter. 7415 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7416 // Just pretend that we didn't see the previous declaration. 7417 Previous.clear(); 7418 } 7419 7420 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7421 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7422 // This is a declaration of or a reference to "std::bad_alloc". 7423 isStdBadAlloc = true; 7424 7425 if (Previous.empty() && StdBadAlloc) { 7426 // std::bad_alloc has been implicitly declared (but made invisible to 7427 // name lookup). Fill in this implicit declaration as the previous 7428 // declaration, so that the declarations get chained appropriately. 7429 Previous.addDecl(getStdBadAlloc()); 7430 } 7431 } 7432 7433 // If we didn't find a previous declaration, and this is a reference 7434 // (or friend reference), move to the correct scope. In C++, we 7435 // also need to do a redeclaration lookup there, just in case 7436 // there's a shadow friend decl. 7437 if (Name && Previous.empty() && 7438 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7439 if (Invalid) goto CreateNewDecl; 7440 assert(SS.isEmpty()); 7441 7442 if (TUK == TUK_Reference) { 7443 // C++ [basic.scope.pdecl]p5: 7444 // -- for an elaborated-type-specifier of the form 7445 // 7446 // class-key identifier 7447 // 7448 // if the elaborated-type-specifier is used in the 7449 // decl-specifier-seq or parameter-declaration-clause of a 7450 // function defined in namespace scope, the identifier is 7451 // declared as a class-name in the namespace that contains 7452 // the declaration; otherwise, except as a friend 7453 // declaration, the identifier is declared in the smallest 7454 // non-class, non-function-prototype scope that contains the 7455 // declaration. 7456 // 7457 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7458 // C structs and unions. 7459 // 7460 // It is an error in C++ to declare (rather than define) an enum 7461 // type, including via an elaborated type specifier. We'll 7462 // diagnose that later; for now, declare the enum in the same 7463 // scope as we would have picked for any other tag type. 7464 // 7465 // GNU C also supports this behavior as part of its incomplete 7466 // enum types extension, while GNU C++ does not. 7467 // 7468 // Find the context where we'll be declaring the tag. 7469 // FIXME: We would like to maintain the current DeclContext as the 7470 // lexical context, 7471 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7472 SearchDC = SearchDC->getParent(); 7473 7474 // Find the scope where we'll be declaring the tag. 7475 while (S->isClassScope() || 7476 (getLangOptions().CPlusPlus && 7477 S->isFunctionPrototypeScope()) || 7478 ((S->getFlags() & Scope::DeclScope) == 0) || 7479 (S->getEntity() && 7480 ((DeclContext *)S->getEntity())->isTransparentContext())) 7481 S = S->getParent(); 7482 } else { 7483 assert(TUK == TUK_Friend); 7484 // C++ [namespace.memdef]p3: 7485 // If a friend declaration in a non-local class first declares a 7486 // class or function, the friend class or function is a member of 7487 // the innermost enclosing namespace. 7488 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7489 } 7490 7491 // In C++, we need to do a redeclaration lookup to properly 7492 // diagnose some problems. 7493 if (getLangOptions().CPlusPlus) { 7494 Previous.setRedeclarationKind(ForRedeclaration); 7495 LookupQualifiedName(Previous, SearchDC); 7496 } 7497 } 7498 7499 if (!Previous.empty()) { 7500 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7501 7502 // It's okay to have a tag decl in the same scope as a typedef 7503 // which hides a tag decl in the same scope. Finding this 7504 // insanity with a redeclaration lookup can only actually happen 7505 // in C++. 7506 // 7507 // This is also okay for elaborated-type-specifiers, which is 7508 // technically forbidden by the current standard but which is 7509 // okay according to the likely resolution of an open issue; 7510 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7511 if (getLangOptions().CPlusPlus) { 7512 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7513 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7514 TagDecl *Tag = TT->getDecl(); 7515 if (Tag->getDeclName() == Name && 7516 Tag->getDeclContext()->getRedeclContext() 7517 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7518 PrevDecl = Tag; 7519 Previous.clear(); 7520 Previous.addDecl(Tag); 7521 Previous.resolveKind(); 7522 } 7523 } 7524 } 7525 } 7526 7527 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7528 // If this is a use of a previous tag, or if the tag is already declared 7529 // in the same scope (so that the definition/declaration completes or 7530 // rementions the tag), reuse the decl. 7531 if (TUK == TUK_Reference || TUK == TUK_Friend || 7532 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7533 // Make sure that this wasn't declared as an enum and now used as a 7534 // struct or something similar. 7535 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7536 TUK == TUK_Definition, KWLoc, 7537 *Name)) { 7538 bool SafeToContinue 7539 = (PrevTagDecl->getTagKind() != TTK_Enum && 7540 Kind != TTK_Enum); 7541 if (SafeToContinue) 7542 Diag(KWLoc, diag::err_use_with_wrong_tag) 7543 << Name 7544 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7545 PrevTagDecl->getKindName()); 7546 else 7547 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7548 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7549 7550 if (SafeToContinue) 7551 Kind = PrevTagDecl->getTagKind(); 7552 else { 7553 // Recover by making this an anonymous redefinition. 7554 Name = 0; 7555 Previous.clear(); 7556 Invalid = true; 7557 } 7558 } 7559 7560 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7561 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7562 7563 // All conflicts with previous declarations are recovered by 7564 // returning the previous declaration. 7565 if (ScopedEnum != PrevEnum->isScoped()) { 7566 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7567 << PrevEnum->isScoped(); 7568 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7569 return PrevTagDecl; 7570 } 7571 else if (EnumUnderlying && PrevEnum->isFixed()) { 7572 QualType T; 7573 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7574 T = TI->getType(); 7575 else 7576 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7577 7578 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 7579 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7580 diag::err_enum_redeclare_type_mismatch) 7581 << T 7582 << PrevEnum->getIntegerType(); 7583 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7584 return PrevTagDecl; 7585 } 7586 } 7587 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7588 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7589 << PrevEnum->isFixed(); 7590 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7591 return PrevTagDecl; 7592 } 7593 } 7594 7595 if (!Invalid) { 7596 // If this is a use, just return the declaration we found. 7597 7598 // FIXME: In the future, return a variant or some other clue 7599 // for the consumer of this Decl to know it doesn't own it. 7600 // For our current ASTs this shouldn't be a problem, but will 7601 // need to be changed with DeclGroups. 7602 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7603 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7604 return PrevTagDecl; 7605 7606 // Diagnose attempts to redefine a tag. 7607 if (TUK == TUK_Definition) { 7608 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7609 // If we're defining a specialization and the previous definition 7610 // is from an implicit instantiation, don't emit an error 7611 // here; we'll catch this in the general case below. 7612 if (!isExplicitSpecialization || 7613 !isa<CXXRecordDecl>(Def) || 7614 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7615 == TSK_ExplicitSpecialization) { 7616 Diag(NameLoc, diag::err_redefinition) << Name; 7617 Diag(Def->getLocation(), diag::note_previous_definition); 7618 // If this is a redefinition, recover by making this 7619 // struct be anonymous, which will make any later 7620 // references get the previous definition. 7621 Name = 0; 7622 Previous.clear(); 7623 Invalid = true; 7624 } 7625 } else { 7626 // If the type is currently being defined, complain 7627 // about a nested redefinition. 7628 const TagType *Tag 7629 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7630 if (Tag->isBeingDefined()) { 7631 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7632 Diag(PrevTagDecl->getLocation(), 7633 diag::note_previous_definition); 7634 Name = 0; 7635 Previous.clear(); 7636 Invalid = true; 7637 } 7638 } 7639 7640 // Okay, this is definition of a previously declared or referenced 7641 // tag PrevDecl. We're going to create a new Decl for it. 7642 } 7643 } 7644 // If we get here we have (another) forward declaration or we 7645 // have a definition. Just create a new decl. 7646 7647 } else { 7648 // If we get here, this is a definition of a new tag type in a nested 7649 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7650 // new decl/type. We set PrevDecl to NULL so that the entities 7651 // have distinct types. 7652 Previous.clear(); 7653 } 7654 // If we get here, we're going to create a new Decl. If PrevDecl 7655 // is non-NULL, it's a definition of the tag declared by 7656 // PrevDecl. If it's NULL, we have a new definition. 7657 7658 7659 // Otherwise, PrevDecl is not a tag, but was found with tag 7660 // lookup. This is only actually possible in C++, where a few 7661 // things like templates still live in the tag namespace. 7662 } else { 7663 assert(getLangOptions().CPlusPlus); 7664 7665 // Use a better diagnostic if an elaborated-type-specifier 7666 // found the wrong kind of type on the first 7667 // (non-redeclaration) lookup. 7668 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7669 !Previous.isForRedeclaration()) { 7670 unsigned Kind = 0; 7671 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7672 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7673 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7674 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7675 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7676 Invalid = true; 7677 7678 // Otherwise, only diagnose if the declaration is in scope. 7679 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7680 isExplicitSpecialization)) { 7681 // do nothing 7682 7683 // Diagnose implicit declarations introduced by elaborated types. 7684 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7685 unsigned Kind = 0; 7686 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7687 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7688 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7689 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7690 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7691 Invalid = true; 7692 7693 // Otherwise it's a declaration. Call out a particularly common 7694 // case here. 7695 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7696 unsigned Kind = 0; 7697 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7698 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7699 << Name << Kind << TND->getUnderlyingType(); 7700 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7701 Invalid = true; 7702 7703 // Otherwise, diagnose. 7704 } else { 7705 // The tag name clashes with something else in the target scope, 7706 // issue an error and recover by making this tag be anonymous. 7707 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7708 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7709 Name = 0; 7710 Invalid = true; 7711 } 7712 7713 // The existing declaration isn't relevant to us; we're in a 7714 // new scope, so clear out the previous declaration. 7715 Previous.clear(); 7716 } 7717 } 7718 7719CreateNewDecl: 7720 7721 TagDecl *PrevDecl = 0; 7722 if (Previous.isSingleResult()) 7723 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 7724 7725 // If there is an identifier, use the location of the identifier as the 7726 // location of the decl, otherwise use the location of the struct/union 7727 // keyword. 7728 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 7729 7730 // Otherwise, create a new declaration. If there is a previous 7731 // declaration of the same entity, the two will be linked via 7732 // PrevDecl. 7733 TagDecl *New; 7734 7735 bool IsForwardReference = false; 7736 if (Kind == TTK_Enum) { 7737 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7738 // enum X { A, B, C } D; D should chain to X. 7739 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 7740 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 7741 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 7742 // If this is an undefined enum, warn. 7743 if (TUK != TUK_Definition && !Invalid) { 7744 TagDecl *Def; 7745 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 7746 // C++0x: 7.2p2: opaque-enum-declaration. 7747 // Conflicts are diagnosed above. Do nothing. 7748 } 7749 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 7750 Diag(Loc, diag::ext_forward_ref_enum_def) 7751 << New; 7752 Diag(Def->getLocation(), diag::note_previous_definition); 7753 } else { 7754 unsigned DiagID = diag::ext_forward_ref_enum; 7755 if (getLangOptions().MicrosoftExt) 7756 DiagID = diag::ext_ms_forward_ref_enum; 7757 else if (getLangOptions().CPlusPlus) 7758 DiagID = diag::err_forward_ref_enum; 7759 Diag(Loc, DiagID); 7760 7761 // If this is a forward-declared reference to an enumeration, make a 7762 // note of it; we won't actually be introducing the declaration into 7763 // the declaration context. 7764 if (TUK == TUK_Reference) 7765 IsForwardReference = true; 7766 } 7767 } 7768 7769 if (EnumUnderlying) { 7770 EnumDecl *ED = cast<EnumDecl>(New); 7771 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7772 ED->setIntegerTypeSourceInfo(TI); 7773 else 7774 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 7775 ED->setPromotionType(ED->getIntegerType()); 7776 } 7777 7778 } else { 7779 // struct/union/class 7780 7781 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7782 // struct X { int A; } D; D should chain to X. 7783 if (getLangOptions().CPlusPlus) { 7784 // FIXME: Look for a way to use RecordDecl for simple structs. 7785 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7786 cast_or_null<CXXRecordDecl>(PrevDecl)); 7787 7788 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 7789 StdBadAlloc = cast<CXXRecordDecl>(New); 7790 } else 7791 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7792 cast_or_null<RecordDecl>(PrevDecl)); 7793 } 7794 7795 // Maybe add qualifier info. 7796 if (SS.isNotEmpty()) { 7797 if (SS.isSet()) { 7798 New->setQualifierInfo(SS.getWithLocInContext(Context)); 7799 if (TemplateParameterLists.size() > 0) { 7800 New->setTemplateParameterListsInfo(Context, 7801 TemplateParameterLists.size(), 7802 (TemplateParameterList**) TemplateParameterLists.release()); 7803 } 7804 } 7805 else 7806 Invalid = true; 7807 } 7808 7809 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 7810 // Add alignment attributes if necessary; these attributes are checked when 7811 // the ASTContext lays out the structure. 7812 // 7813 // It is important for implementing the correct semantics that this 7814 // happen here (in act on tag decl). The #pragma pack stack is 7815 // maintained as a result of parser callbacks which can occur at 7816 // many points during the parsing of a struct declaration (because 7817 // the #pragma tokens are effectively skipped over during the 7818 // parsing of the struct). 7819 AddAlignmentAttributesForRecord(RD); 7820 7821 AddMsStructLayoutForRecord(RD); 7822 } 7823 7824 if (PrevDecl && PrevDecl->isModulePrivate()) 7825 New->setModulePrivate(); 7826 else if (ModulePrivateLoc.isValid()) { 7827 if (isExplicitSpecialization) 7828 Diag(New->getLocation(), diag::err_module_private_specialization) 7829 << 2 7830 << FixItHint::CreateRemoval(ModulePrivateLoc); 7831 else if (PrevDecl && !PrevDecl->isModulePrivate()) 7832 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc); 7833 // __module_private__ does not apply to local classes. However, we only 7834 // diagnose this as an error when the declaration specifiers are 7835 // freestanding. Here, we just ignore the __module_private__. 7836 // foobar 7837 else if (!SearchDC->isFunctionOrMethod()) 7838 New->setModulePrivate(); 7839 } 7840 7841 // If this is a specialization of a member class (of a class template), 7842 // check the specialization. 7843 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 7844 Invalid = true; 7845 7846 if (Invalid) 7847 New->setInvalidDecl(); 7848 7849 if (Attr) 7850 ProcessDeclAttributeList(S, New, Attr); 7851 7852 // If we're declaring or defining a tag in function prototype scope 7853 // in C, note that this type can only be used within the function. 7854 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 7855 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 7856 7857 // Set the lexical context. If the tag has a C++ scope specifier, the 7858 // lexical context will be different from the semantic context. 7859 New->setLexicalDeclContext(CurContext); 7860 7861 // Mark this as a friend decl if applicable. 7862 // In Microsoft mode, a friend declaration also acts as a forward 7863 // declaration so we always pass true to setObjectOfFriendDecl to make 7864 // the tag name visible. 7865 if (TUK == TUK_Friend) 7866 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 7867 getLangOptions().MicrosoftExt); 7868 7869 // Set the access specifier. 7870 if (!Invalid && SearchDC->isRecord()) 7871 SetMemberAccessSpecifier(New, PrevDecl, AS); 7872 7873 if (TUK == TUK_Definition) 7874 New->startDefinition(); 7875 7876 // If this has an identifier, add it to the scope stack. 7877 if (TUK == TUK_Friend) { 7878 // We might be replacing an existing declaration in the lookup tables; 7879 // if so, borrow its access specifier. 7880 if (PrevDecl) 7881 New->setAccess(PrevDecl->getAccess()); 7882 7883 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 7884 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7885 if (Name) // can be null along some error paths 7886 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7887 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 7888 } else if (Name) { 7889 S = getNonFieldDeclScope(S); 7890 PushOnScopeChains(New, S, !IsForwardReference); 7891 if (IsForwardReference) 7892 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7893 7894 } else { 7895 CurContext->addDecl(New); 7896 } 7897 7898 // If this is the C FILE type, notify the AST context. 7899 if (IdentifierInfo *II = New->getIdentifier()) 7900 if (!New->isInvalidDecl() && 7901 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 7902 II->isStr("FILE")) 7903 Context.setFILEDecl(New); 7904 7905 OwnedDecl = true; 7906 return New; 7907} 7908 7909void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 7910 AdjustDeclIfTemplate(TagD); 7911 TagDecl *Tag = cast<TagDecl>(TagD); 7912 7913 // Enter the tag context. 7914 PushDeclContext(S, Tag); 7915} 7916 7917void Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 7918 assert(isa<ObjCContainerDecl>(IDecl) && 7919 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 7920 DeclContext *OCD = cast<DeclContext>(IDecl); 7921 assert(getContainingDC(OCD) == CurContext && 7922 "The next DeclContext should be lexically contained in the current one."); 7923 CurContext = OCD; 7924} 7925 7926void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 7927 SourceLocation FinalLoc, 7928 SourceLocation LBraceLoc) { 7929 AdjustDeclIfTemplate(TagD); 7930 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 7931 7932 FieldCollector->StartClass(); 7933 7934 if (!Record->getIdentifier()) 7935 return; 7936 7937 if (FinalLoc.isValid()) 7938 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 7939 7940 // C++ [class]p2: 7941 // [...] The class-name is also inserted into the scope of the 7942 // class itself; this is known as the injected-class-name. For 7943 // purposes of access checking, the injected-class-name is treated 7944 // as if it were a public member name. 7945 CXXRecordDecl *InjectedClassName 7946 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 7947 Record->getLocStart(), Record->getLocation(), 7948 Record->getIdentifier(), 7949 /*PrevDecl=*/0, 7950 /*DelayTypeCreation=*/true); 7951 Context.getTypeDeclType(InjectedClassName, Record); 7952 InjectedClassName->setImplicit(); 7953 InjectedClassName->setAccess(AS_public); 7954 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 7955 InjectedClassName->setDescribedClassTemplate(Template); 7956 PushOnScopeChains(InjectedClassName, S); 7957 assert(InjectedClassName->isInjectedClassName() && 7958 "Broken injected-class-name"); 7959} 7960 7961void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 7962 SourceLocation RBraceLoc) { 7963 AdjustDeclIfTemplate(TagD); 7964 TagDecl *Tag = cast<TagDecl>(TagD); 7965 Tag->setRBraceLoc(RBraceLoc); 7966 7967 if (isa<CXXRecordDecl>(Tag)) 7968 FieldCollector->FinishClass(); 7969 7970 // Exit this scope of this tag's definition. 7971 PopDeclContext(); 7972 7973 // Notify the consumer that we've defined a tag. 7974 Consumer.HandleTagDeclDefinition(Tag); 7975} 7976 7977void Sema::ActOnObjCContainerFinishDefinition() { 7978 // Exit this scope of this interface definition. 7979 PopDeclContext(); 7980} 7981 7982void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 7983 AdjustDeclIfTemplate(TagD); 7984 TagDecl *Tag = cast<TagDecl>(TagD); 7985 Tag->setInvalidDecl(); 7986 7987 // We're undoing ActOnTagStartDefinition here, not 7988 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 7989 // the FieldCollector. 7990 7991 PopDeclContext(); 7992} 7993 7994// Note that FieldName may be null for anonymous bitfields. 7995bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 7996 QualType FieldTy, const Expr *BitWidth, 7997 bool *ZeroWidth) { 7998 // Default to true; that shouldn't confuse checks for emptiness 7999 if (ZeroWidth) 8000 *ZeroWidth = true; 8001 8002 // C99 6.7.2.1p4 - verify the field type. 8003 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8004 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8005 // Handle incomplete types with specific error. 8006 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8007 return true; 8008 if (FieldName) 8009 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8010 << FieldName << FieldTy << BitWidth->getSourceRange(); 8011 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8012 << FieldTy << BitWidth->getSourceRange(); 8013 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8014 UPPC_BitFieldWidth)) 8015 return true; 8016 8017 // If the bit-width is type- or value-dependent, don't try to check 8018 // it now. 8019 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8020 return false; 8021 8022 llvm::APSInt Value; 8023 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8024 return true; 8025 8026 if (Value != 0 && ZeroWidth) 8027 *ZeroWidth = false; 8028 8029 // Zero-width bitfield is ok for anonymous field. 8030 if (Value == 0 && FieldName) 8031 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8032 8033 if (Value.isSigned() && Value.isNegative()) { 8034 if (FieldName) 8035 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8036 << FieldName << Value.toString(10); 8037 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8038 << Value.toString(10); 8039 } 8040 8041 if (!FieldTy->isDependentType()) { 8042 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8043 if (Value.getZExtValue() > TypeSize) { 8044 if (!getLangOptions().CPlusPlus) { 8045 if (FieldName) 8046 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8047 << FieldName << (unsigned)Value.getZExtValue() 8048 << (unsigned)TypeSize; 8049 8050 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8051 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8052 } 8053 8054 if (FieldName) 8055 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8056 << FieldName << (unsigned)Value.getZExtValue() 8057 << (unsigned)TypeSize; 8058 else 8059 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8060 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8061 } 8062 } 8063 8064 return false; 8065} 8066 8067/// ActOnField - Each field of a C struct/union is passed into this in order 8068/// to create a FieldDecl object for it. 8069Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8070 Declarator &D, Expr *BitfieldWidth) { 8071 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8072 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8073 /*HasInit=*/false, AS_public); 8074 return Res; 8075} 8076 8077/// HandleField - Analyze a field of a C struct or a C++ data member. 8078/// 8079FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8080 SourceLocation DeclStart, 8081 Declarator &D, Expr *BitWidth, bool HasInit, 8082 AccessSpecifier AS) { 8083 IdentifierInfo *II = D.getIdentifier(); 8084 SourceLocation Loc = DeclStart; 8085 if (II) Loc = D.getIdentifierLoc(); 8086 8087 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8088 QualType T = TInfo->getType(); 8089 if (getLangOptions().CPlusPlus) { 8090 CheckExtraCXXDefaultArguments(D); 8091 8092 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8093 UPPC_DataMemberType)) { 8094 D.setInvalidType(); 8095 T = Context.IntTy; 8096 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8097 } 8098 } 8099 8100 DiagnoseFunctionSpecifiers(D); 8101 8102 if (D.getDeclSpec().isThreadSpecified()) 8103 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8104 if (D.getDeclSpec().isConstexprSpecified()) 8105 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8106 << 2; 8107 8108 // Check to see if this name was declared as a member previously 8109 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8110 LookupName(Previous, S); 8111 assert((Previous.empty() || Previous.isOverloadedResult() || 8112 Previous.isSingleResult()) 8113 && "Lookup of member name should be either overloaded, single or null"); 8114 8115 // If the name is overloaded then get any declaration else get the single result 8116 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 8117 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 8118 8119 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8120 // Maybe we will complain about the shadowed template parameter. 8121 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8122 // Just pretend that we didn't see the previous declaration. 8123 PrevDecl = 0; 8124 } 8125 8126 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8127 PrevDecl = 0; 8128 8129 bool Mutable 8130 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8131 SourceLocation TSSL = D.getSourceRange().getBegin(); 8132 FieldDecl *NewFD 8133 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8134 TSSL, AS, PrevDecl, &D); 8135 8136 if (NewFD->isInvalidDecl()) 8137 Record->setInvalidDecl(); 8138 8139 if (D.getDeclSpec().isModulePrivateSpecified()) 8140 NewFD->setModulePrivate(); 8141 8142 if (NewFD->isInvalidDecl() && PrevDecl) { 8143 // Don't introduce NewFD into scope; there's already something 8144 // with the same name in the same scope. 8145 } else if (II) { 8146 PushOnScopeChains(NewFD, S); 8147 } else 8148 Record->addDecl(NewFD); 8149 8150 return NewFD; 8151} 8152 8153/// \brief Build a new FieldDecl and check its well-formedness. 8154/// 8155/// This routine builds a new FieldDecl given the fields name, type, 8156/// record, etc. \p PrevDecl should refer to any previous declaration 8157/// with the same name and in the same scope as the field to be 8158/// created. 8159/// 8160/// \returns a new FieldDecl. 8161/// 8162/// \todo The Declarator argument is a hack. It will be removed once 8163FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8164 TypeSourceInfo *TInfo, 8165 RecordDecl *Record, SourceLocation Loc, 8166 bool Mutable, Expr *BitWidth, bool HasInit, 8167 SourceLocation TSSL, 8168 AccessSpecifier AS, NamedDecl *PrevDecl, 8169 Declarator *D) { 8170 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8171 bool InvalidDecl = false; 8172 if (D) InvalidDecl = D->isInvalidType(); 8173 8174 // If we receive a broken type, recover by assuming 'int' and 8175 // marking this declaration as invalid. 8176 if (T.isNull()) { 8177 InvalidDecl = true; 8178 T = Context.IntTy; 8179 } 8180 8181 QualType EltTy = Context.getBaseElementType(T); 8182 if (!EltTy->isDependentType() && 8183 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8184 // Fields of incomplete type force their record to be invalid. 8185 Record->setInvalidDecl(); 8186 InvalidDecl = true; 8187 } 8188 8189 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8190 // than a variably modified type. 8191 if (!InvalidDecl && T->isVariablyModifiedType()) { 8192 bool SizeIsNegative; 8193 llvm::APSInt Oversized; 8194 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8195 SizeIsNegative, 8196 Oversized); 8197 if (!FixedTy.isNull()) { 8198 Diag(Loc, diag::warn_illegal_constant_array_size); 8199 T = FixedTy; 8200 } else { 8201 if (SizeIsNegative) 8202 Diag(Loc, diag::err_typecheck_negative_array_size); 8203 else if (Oversized.getBoolValue()) 8204 Diag(Loc, diag::err_array_too_large) 8205 << Oversized.toString(10); 8206 else 8207 Diag(Loc, diag::err_typecheck_field_variable_size); 8208 InvalidDecl = true; 8209 } 8210 } 8211 8212 // Fields can not have abstract class types 8213 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8214 diag::err_abstract_type_in_decl, 8215 AbstractFieldType)) 8216 InvalidDecl = true; 8217 8218 bool ZeroWidth = false; 8219 // If this is declared as a bit-field, check the bit-field. 8220 if (!InvalidDecl && BitWidth && 8221 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8222 InvalidDecl = true; 8223 BitWidth = 0; 8224 ZeroWidth = false; 8225 } 8226 8227 // Check that 'mutable' is consistent with the type of the declaration. 8228 if (!InvalidDecl && Mutable) { 8229 unsigned DiagID = 0; 8230 if (T->isReferenceType()) 8231 DiagID = diag::err_mutable_reference; 8232 else if (T.isConstQualified()) 8233 DiagID = diag::err_mutable_const; 8234 8235 if (DiagID) { 8236 SourceLocation ErrLoc = Loc; 8237 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8238 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8239 Diag(ErrLoc, DiagID); 8240 Mutable = false; 8241 InvalidDecl = true; 8242 } 8243 } 8244 8245 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8246 BitWidth, Mutable, HasInit); 8247 if (InvalidDecl) 8248 NewFD->setInvalidDecl(); 8249 8250 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8251 Diag(Loc, diag::err_duplicate_member) << II; 8252 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8253 NewFD->setInvalidDecl(); 8254 } 8255 8256 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8257 if (Record->isUnion()) { 8258 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8259 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8260 if (RDecl->getDefinition()) { 8261 // C++ [class.union]p1: An object of a class with a non-trivial 8262 // constructor, a non-trivial copy constructor, a non-trivial 8263 // destructor, or a non-trivial copy assignment operator 8264 // cannot be a member of a union, nor can an array of such 8265 // objects. 8266 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(NewFD)) 8267 NewFD->setInvalidDecl(); 8268 } 8269 } 8270 8271 // C++ [class.union]p1: If a union contains a member of reference type, 8272 // the program is ill-formed. 8273 if (EltTy->isReferenceType()) { 8274 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8275 << NewFD->getDeclName() << EltTy; 8276 NewFD->setInvalidDecl(); 8277 } 8278 } 8279 } 8280 8281 // FIXME: We need to pass in the attributes given an AST 8282 // representation, not a parser representation. 8283 if (D) 8284 // FIXME: What to pass instead of TUScope? 8285 ProcessDeclAttributes(TUScope, NewFD, *D); 8286 8287 // In auto-retain/release, infer strong retension for fields of 8288 // retainable type. 8289 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8290 NewFD->setInvalidDecl(); 8291 8292 if (T.isObjCGCWeak()) 8293 Diag(Loc, diag::warn_attribute_weak_on_field); 8294 8295 NewFD->setAccess(AS); 8296 return NewFD; 8297} 8298 8299bool Sema::CheckNontrivialField(FieldDecl *FD) { 8300 assert(FD); 8301 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8302 8303 if (FD->isInvalidDecl()) 8304 return true; 8305 8306 QualType EltTy = Context.getBaseElementType(FD->getType()); 8307 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8308 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8309 if (RDecl->getDefinition()) { 8310 // We check for copy constructors before constructors 8311 // because otherwise we'll never get complaints about 8312 // copy constructors. 8313 8314 CXXSpecialMember member = CXXInvalid; 8315 if (!RDecl->hasTrivialCopyConstructor()) 8316 member = CXXCopyConstructor; 8317 else if (!RDecl->hasTrivialDefaultConstructor()) 8318 member = CXXDefaultConstructor; 8319 else if (!RDecl->hasTrivialCopyAssignment()) 8320 member = CXXCopyAssignment; 8321 else if (!RDecl->hasTrivialDestructor()) 8322 member = CXXDestructor; 8323 8324 if (member != CXXInvalid) { 8325 if (getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8326 // Objective-C++ ARC: it is an error to have a non-trivial field of 8327 // a union. However, system headers in Objective-C programs 8328 // occasionally have Objective-C lifetime objects within unions, 8329 // and rather than cause the program to fail, we make those 8330 // members unavailable. 8331 SourceLocation Loc = FD->getLocation(); 8332 if (getSourceManager().isInSystemHeader(Loc)) { 8333 if (!FD->hasAttr<UnavailableAttr>()) 8334 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8335 "this system field has retaining ownership")); 8336 return false; 8337 } 8338 } 8339 8340 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 8341 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8342 DiagnoseNontrivial(RT, member); 8343 return true; 8344 } 8345 } 8346 } 8347 8348 return false; 8349} 8350 8351/// DiagnoseNontrivial - Given that a class has a non-trivial 8352/// special member, figure out why. 8353void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8354 QualType QT(T, 0U); 8355 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8356 8357 // Check whether the member was user-declared. 8358 switch (member) { 8359 case CXXInvalid: 8360 break; 8361 8362 case CXXDefaultConstructor: 8363 if (RD->hasUserDeclaredConstructor()) { 8364 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8365 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8366 const FunctionDecl *body = 0; 8367 ci->hasBody(body); 8368 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8369 SourceLocation CtorLoc = ci->getLocation(); 8370 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8371 return; 8372 } 8373 } 8374 8375 assert(0 && "found no user-declared constructors"); 8376 return; 8377 } 8378 break; 8379 8380 case CXXCopyConstructor: 8381 if (RD->hasUserDeclaredCopyConstructor()) { 8382 SourceLocation CtorLoc = 8383 RD->getCopyConstructor(0)->getLocation(); 8384 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8385 return; 8386 } 8387 break; 8388 8389 case CXXMoveConstructor: 8390 if (RD->hasUserDeclaredMoveConstructor()) { 8391 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8392 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8393 return; 8394 } 8395 break; 8396 8397 case CXXCopyAssignment: 8398 if (RD->hasUserDeclaredCopyAssignment()) { 8399 // FIXME: this should use the location of the copy 8400 // assignment, not the type. 8401 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8402 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8403 return; 8404 } 8405 break; 8406 8407 case CXXMoveAssignment: 8408 if (RD->hasUserDeclaredMoveAssignment()) { 8409 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8410 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8411 return; 8412 } 8413 break; 8414 8415 case CXXDestructor: 8416 if (RD->hasUserDeclaredDestructor()) { 8417 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8418 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8419 return; 8420 } 8421 break; 8422 } 8423 8424 typedef CXXRecordDecl::base_class_iterator base_iter; 8425 8426 // Virtual bases and members inhibit trivial copying/construction, 8427 // but not trivial destruction. 8428 if (member != CXXDestructor) { 8429 // Check for virtual bases. vbases includes indirect virtual bases, 8430 // so we just iterate through the direct bases. 8431 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8432 if (bi->isVirtual()) { 8433 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8434 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8435 return; 8436 } 8437 8438 // Check for virtual methods. 8439 typedef CXXRecordDecl::method_iterator meth_iter; 8440 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8441 ++mi) { 8442 if (mi->isVirtual()) { 8443 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8444 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8445 return; 8446 } 8447 } 8448 } 8449 8450 bool (CXXRecordDecl::*hasTrivial)() const; 8451 switch (member) { 8452 case CXXDefaultConstructor: 8453 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8454 case CXXCopyConstructor: 8455 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8456 case CXXCopyAssignment: 8457 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8458 case CXXDestructor: 8459 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8460 default: 8461 assert(0 && "unexpected special member"); return; 8462 } 8463 8464 // Check for nontrivial bases (and recurse). 8465 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8466 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8467 assert(BaseRT && "Don't know how to handle dependent bases"); 8468 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8469 if (!(BaseRecTy->*hasTrivial)()) { 8470 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8471 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8472 DiagnoseNontrivial(BaseRT, member); 8473 return; 8474 } 8475 } 8476 8477 // Check for nontrivial members (and recurse). 8478 typedef RecordDecl::field_iterator field_iter; 8479 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8480 ++fi) { 8481 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8482 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8483 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8484 8485 if (!(EltRD->*hasTrivial)()) { 8486 SourceLocation FLoc = (*fi)->getLocation(); 8487 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8488 DiagnoseNontrivial(EltRT, member); 8489 return; 8490 } 8491 } 8492 8493 if (EltTy->isObjCLifetimeType()) { 8494 switch (EltTy.getObjCLifetime()) { 8495 case Qualifiers::OCL_None: 8496 case Qualifiers::OCL_ExplicitNone: 8497 break; 8498 8499 case Qualifiers::OCL_Autoreleasing: 8500 case Qualifiers::OCL_Weak: 8501 case Qualifiers::OCL_Strong: 8502 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8503 << QT << EltTy.getObjCLifetime(); 8504 return; 8505 } 8506 } 8507 } 8508 8509 assert(0 && "found no explanation for non-trivial member"); 8510} 8511 8512/// TranslateIvarVisibility - Translate visibility from a token ID to an 8513/// AST enum value. 8514static ObjCIvarDecl::AccessControl 8515TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8516 switch (ivarVisibility) { 8517 default: assert(0 && "Unknown visitibility kind"); 8518 case tok::objc_private: return ObjCIvarDecl::Private; 8519 case tok::objc_public: return ObjCIvarDecl::Public; 8520 case tok::objc_protected: return ObjCIvarDecl::Protected; 8521 case tok::objc_package: return ObjCIvarDecl::Package; 8522 } 8523} 8524 8525/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8526/// in order to create an IvarDecl object for it. 8527Decl *Sema::ActOnIvar(Scope *S, 8528 SourceLocation DeclStart, 8529 Declarator &D, Expr *BitfieldWidth, 8530 tok::ObjCKeywordKind Visibility) { 8531 8532 IdentifierInfo *II = D.getIdentifier(); 8533 Expr *BitWidth = (Expr*)BitfieldWidth; 8534 SourceLocation Loc = DeclStart; 8535 if (II) Loc = D.getIdentifierLoc(); 8536 8537 // FIXME: Unnamed fields can be handled in various different ways, for 8538 // example, unnamed unions inject all members into the struct namespace! 8539 8540 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8541 QualType T = TInfo->getType(); 8542 8543 if (BitWidth) { 8544 // 6.7.2.1p3, 6.7.2.1p4 8545 if (VerifyBitField(Loc, II, T, BitWidth)) { 8546 D.setInvalidType(); 8547 BitWidth = 0; 8548 } 8549 } else { 8550 // Not a bitfield. 8551 8552 // validate II. 8553 8554 } 8555 if (T->isReferenceType()) { 8556 Diag(Loc, diag::err_ivar_reference_type); 8557 D.setInvalidType(); 8558 } 8559 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8560 // than a variably modified type. 8561 else if (T->isVariablyModifiedType()) { 8562 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8563 D.setInvalidType(); 8564 } 8565 8566 // Get the visibility (access control) for this ivar. 8567 ObjCIvarDecl::AccessControl ac = 8568 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8569 : ObjCIvarDecl::None; 8570 // Must set ivar's DeclContext to its enclosing interface. 8571 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8572 ObjCContainerDecl *EnclosingContext; 8573 if (ObjCImplementationDecl *IMPDecl = 8574 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8575 if (!LangOpts.ObjCNonFragileABI2) { 8576 // Case of ivar declared in an implementation. Context is that of its class. 8577 EnclosingContext = IMPDecl->getClassInterface(); 8578 assert(EnclosingContext && "Implementation has no class interface!"); 8579 } 8580 else 8581 EnclosingContext = EnclosingDecl; 8582 } else { 8583 if (ObjCCategoryDecl *CDecl = 8584 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8585 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8586 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8587 return 0; 8588 } 8589 } 8590 EnclosingContext = EnclosingDecl; 8591 } 8592 8593 // Construct the decl. 8594 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8595 DeclStart, Loc, II, T, 8596 TInfo, ac, (Expr *)BitfieldWidth); 8597 8598 if (II) { 8599 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8600 ForRedeclaration); 8601 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8602 && !isa<TagDecl>(PrevDecl)) { 8603 Diag(Loc, diag::err_duplicate_member) << II; 8604 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8605 NewID->setInvalidDecl(); 8606 } 8607 } 8608 8609 // Process attributes attached to the ivar. 8610 ProcessDeclAttributes(S, NewID, D); 8611 8612 if (D.isInvalidType()) 8613 NewID->setInvalidDecl(); 8614 8615 // In ARC, infer 'retaining' for ivars of retainable type. 8616 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8617 NewID->setInvalidDecl(); 8618 8619 if (D.getDeclSpec().isModulePrivateSpecified()) 8620 NewID->setModulePrivate(); 8621 8622 if (II) { 8623 // FIXME: When interfaces are DeclContexts, we'll need to add 8624 // these to the interface. 8625 S->AddDecl(NewID); 8626 IdResolver.AddDecl(NewID); 8627 } 8628 8629 return NewID; 8630} 8631 8632/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8633/// class and class extensions. For every class @interface and class 8634/// extension @interface, if the last ivar is a bitfield of any type, 8635/// then add an implicit `char :0` ivar to the end of that interface. 8636void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8637 SmallVectorImpl<Decl *> &AllIvarDecls) { 8638 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8639 return; 8640 8641 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8642 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8643 8644 if (!Ivar->isBitField()) 8645 return; 8646 uint64_t BitFieldSize = 8647 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 8648 if (BitFieldSize == 0) 8649 return; 8650 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 8651 if (!ID) { 8652 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 8653 if (!CD->IsClassExtension()) 8654 return; 8655 } 8656 // No need to add this to end of @implementation. 8657 else 8658 return; 8659 } 8660 // All conditions are met. Add a new bitfield to the tail end of ivars. 8661 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 8662 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 8663 8664 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 8665 DeclLoc, DeclLoc, 0, 8666 Context.CharTy, 8667 Context.getTrivialTypeSourceInfo(Context.CharTy, 8668 DeclLoc), 8669 ObjCIvarDecl::Private, BW, 8670 true); 8671 AllIvarDecls.push_back(Ivar); 8672} 8673 8674void Sema::ActOnFields(Scope* S, 8675 SourceLocation RecLoc, Decl *EnclosingDecl, 8676 Decl **Fields, unsigned NumFields, 8677 SourceLocation LBrac, SourceLocation RBrac, 8678 AttributeList *Attr) { 8679 assert(EnclosingDecl && "missing record or interface decl"); 8680 8681 // If the decl this is being inserted into is invalid, then it may be a 8682 // redeclaration or some other bogus case. Don't try to add fields to it. 8683 if (EnclosingDecl->isInvalidDecl()) 8684 return; 8685 8686 // Verify that all the fields are okay. 8687 unsigned NumNamedMembers = 0; 8688 SmallVector<FieldDecl*, 32> RecFields; 8689 8690 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 8691 bool ARCErrReported = false; 8692 for (unsigned i = 0; i != NumFields; ++i) { 8693 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 8694 8695 // Get the type for the field. 8696 const Type *FDTy = FD->getType().getTypePtr(); 8697 8698 if (!FD->isAnonymousStructOrUnion()) { 8699 // Remember all fields written by the user. 8700 RecFields.push_back(FD); 8701 } 8702 8703 // If the field is already invalid for some reason, don't emit more 8704 // diagnostics about it. 8705 if (FD->isInvalidDecl()) { 8706 EnclosingDecl->setInvalidDecl(); 8707 continue; 8708 } 8709 8710 // C99 6.7.2.1p2: 8711 // A structure or union shall not contain a member with 8712 // incomplete or function type (hence, a structure shall not 8713 // contain an instance of itself, but may contain a pointer to 8714 // an instance of itself), except that the last member of a 8715 // structure with more than one named member may have incomplete 8716 // array type; such a structure (and any union containing, 8717 // possibly recursively, a member that is such a structure) 8718 // shall not be a member of a structure or an element of an 8719 // array. 8720 if (FDTy->isFunctionType()) { 8721 // Field declared as a function. 8722 Diag(FD->getLocation(), diag::err_field_declared_as_function) 8723 << FD->getDeclName(); 8724 FD->setInvalidDecl(); 8725 EnclosingDecl->setInvalidDecl(); 8726 continue; 8727 } else if (FDTy->isIncompleteArrayType() && Record && 8728 ((i == NumFields - 1 && !Record->isUnion()) || 8729 ((getLangOptions().MicrosoftExt || 8730 getLangOptions().CPlusPlus) && 8731 (i == NumFields - 1 || Record->isUnion())))) { 8732 // Flexible array member. 8733 // Microsoft and g++ is more permissive regarding flexible array. 8734 // It will accept flexible array in union and also 8735 // as the sole element of a struct/class. 8736 if (getLangOptions().MicrosoftExt) { 8737 if (Record->isUnion()) 8738 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 8739 << FD->getDeclName(); 8740 else if (NumFields == 1) 8741 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 8742 << FD->getDeclName() << Record->getTagKind(); 8743 } else if (getLangOptions().CPlusPlus) { 8744 if (Record->isUnion()) 8745 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 8746 << FD->getDeclName(); 8747 else if (NumFields == 1) 8748 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 8749 << FD->getDeclName() << Record->getTagKind(); 8750 } else if (NumNamedMembers < 1) { 8751 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 8752 << FD->getDeclName(); 8753 FD->setInvalidDecl(); 8754 EnclosingDecl->setInvalidDecl(); 8755 continue; 8756 } 8757 if (!FD->getType()->isDependentType() && 8758 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 8759 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 8760 << FD->getDeclName() << FD->getType(); 8761 FD->setInvalidDecl(); 8762 EnclosingDecl->setInvalidDecl(); 8763 continue; 8764 } 8765 // Okay, we have a legal flexible array member at the end of the struct. 8766 if (Record) 8767 Record->setHasFlexibleArrayMember(true); 8768 } else if (!FDTy->isDependentType() && 8769 RequireCompleteType(FD->getLocation(), FD->getType(), 8770 diag::err_field_incomplete)) { 8771 // Incomplete type 8772 FD->setInvalidDecl(); 8773 EnclosingDecl->setInvalidDecl(); 8774 continue; 8775 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 8776 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 8777 // If this is a member of a union, then entire union becomes "flexible". 8778 if (Record && Record->isUnion()) { 8779 Record->setHasFlexibleArrayMember(true); 8780 } else { 8781 // If this is a struct/class and this is not the last element, reject 8782 // it. Note that GCC supports variable sized arrays in the middle of 8783 // structures. 8784 if (i != NumFields-1) 8785 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 8786 << FD->getDeclName() << FD->getType(); 8787 else { 8788 // We support flexible arrays at the end of structs in 8789 // other structs as an extension. 8790 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 8791 << FD->getDeclName(); 8792 if (Record) 8793 Record->setHasFlexibleArrayMember(true); 8794 } 8795 } 8796 } 8797 if (Record && FDTTy->getDecl()->hasObjectMember()) 8798 Record->setHasObjectMember(true); 8799 } else if (FDTy->isObjCObjectType()) { 8800 /// A field cannot be an Objective-c object 8801 Diag(FD->getLocation(), diag::err_statically_allocated_object) 8802 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 8803 QualType T = Context.getObjCObjectPointerType(FD->getType()); 8804 FD->setType(T); 8805 } 8806 else if (!getLangOptions().CPlusPlus) { 8807 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 8808 // It's an error in ARC if a field has lifetime. 8809 // We don't want to report this in a system header, though, 8810 // so we just make the field unavailable. 8811 // FIXME: that's really not sufficient; we need to make the type 8812 // itself invalid to, say, initialize or copy. 8813 QualType T = FD->getType(); 8814 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 8815 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 8816 SourceLocation loc = FD->getLocation(); 8817 if (getSourceManager().isInSystemHeader(loc)) { 8818 if (!FD->hasAttr<UnavailableAttr>()) { 8819 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 8820 "this system field has retaining ownership")); 8821 } 8822 } else { 8823 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 8824 } 8825 ARCErrReported = true; 8826 } 8827 } 8828 else if (getLangOptions().ObjC1 && 8829 getLangOptions().getGC() != LangOptions::NonGC && 8830 Record && !Record->hasObjectMember()) { 8831 if (FD->getType()->isObjCObjectPointerType() || 8832 FD->getType().isObjCGCStrong()) 8833 Record->setHasObjectMember(true); 8834 else if (Context.getAsArrayType(FD->getType())) { 8835 QualType BaseType = Context.getBaseElementType(FD->getType()); 8836 if (BaseType->isRecordType() && 8837 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 8838 Record->setHasObjectMember(true); 8839 else if (BaseType->isObjCObjectPointerType() || 8840 BaseType.isObjCGCStrong()) 8841 Record->setHasObjectMember(true); 8842 } 8843 } 8844 } 8845 // Keep track of the number of named members. 8846 if (FD->getIdentifier()) 8847 ++NumNamedMembers; 8848 } 8849 8850 // Okay, we successfully defined 'Record'. 8851 if (Record) { 8852 bool Completed = false; 8853 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 8854 if (!CXXRecord->isInvalidDecl()) { 8855 // Set access bits correctly on the directly-declared conversions. 8856 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 8857 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 8858 I != E; ++I) 8859 Convs->setAccess(I, (*I)->getAccess()); 8860 8861 if (!CXXRecord->isDependentType()) { 8862 // Objective-C Automatic Reference Counting: 8863 // If a class has a non-static data member of Objective-C pointer 8864 // type (or array thereof), it is a non-POD type and its 8865 // default constructor (if any), copy constructor, copy assignment 8866 // operator, and destructor are non-trivial. 8867 // 8868 // This rule is also handled by CXXRecordDecl::completeDefinition(). 8869 // However, here we check whether this particular class is only 8870 // non-POD because of the presence of an Objective-C pointer member. 8871 // If so, objects of this type cannot be shared between code compiled 8872 // with instant objects and code compiled with manual retain/release. 8873 if (getLangOptions().ObjCAutoRefCount && 8874 CXXRecord->hasObjectMember() && 8875 CXXRecord->getLinkage() == ExternalLinkage) { 8876 if (CXXRecord->isPOD()) { 8877 Diag(CXXRecord->getLocation(), 8878 diag::warn_arc_non_pod_class_with_object_member) 8879 << CXXRecord; 8880 } else { 8881 // FIXME: Fix-Its would be nice here, but finding a good location 8882 // for them is going to be tricky. 8883 if (CXXRecord->hasTrivialCopyConstructor()) 8884 Diag(CXXRecord->getLocation(), 8885 diag::warn_arc_trivial_member_function_with_object_member) 8886 << CXXRecord << 0; 8887 if (CXXRecord->hasTrivialCopyAssignment()) 8888 Diag(CXXRecord->getLocation(), 8889 diag::warn_arc_trivial_member_function_with_object_member) 8890 << CXXRecord << 1; 8891 if (CXXRecord->hasTrivialDestructor()) 8892 Diag(CXXRecord->getLocation(), 8893 diag::warn_arc_trivial_member_function_with_object_member) 8894 << CXXRecord << 2; 8895 } 8896 } 8897 8898 // Adjust user-defined destructor exception spec. 8899 if (getLangOptions().CPlusPlus0x && 8900 CXXRecord->hasUserDeclaredDestructor()) 8901 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 8902 8903 // Add any implicitly-declared members to this class. 8904 AddImplicitlyDeclaredMembersToClass(CXXRecord); 8905 8906 // If we have virtual base classes, we may end up finding multiple 8907 // final overriders for a given virtual function. Check for this 8908 // problem now. 8909 if (CXXRecord->getNumVBases()) { 8910 CXXFinalOverriderMap FinalOverriders; 8911 CXXRecord->getFinalOverriders(FinalOverriders); 8912 8913 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 8914 MEnd = FinalOverriders.end(); 8915 M != MEnd; ++M) { 8916 for (OverridingMethods::iterator SO = M->second.begin(), 8917 SOEnd = M->second.end(); 8918 SO != SOEnd; ++SO) { 8919 assert(SO->second.size() > 0 && 8920 "Virtual function without overridding functions?"); 8921 if (SO->second.size() == 1) 8922 continue; 8923 8924 // C++ [class.virtual]p2: 8925 // In a derived class, if a virtual member function of a base 8926 // class subobject has more than one final overrider the 8927 // program is ill-formed. 8928 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 8929 << (NamedDecl *)M->first << Record; 8930 Diag(M->first->getLocation(), 8931 diag::note_overridden_virtual_function); 8932 for (OverridingMethods::overriding_iterator 8933 OM = SO->second.begin(), 8934 OMEnd = SO->second.end(); 8935 OM != OMEnd; ++OM) 8936 Diag(OM->Method->getLocation(), diag::note_final_overrider) 8937 << (NamedDecl *)M->first << OM->Method->getParent(); 8938 8939 Record->setInvalidDecl(); 8940 } 8941 } 8942 CXXRecord->completeDefinition(&FinalOverriders); 8943 Completed = true; 8944 } 8945 } 8946 } 8947 } 8948 8949 if (!Completed) 8950 Record->completeDefinition(); 8951 8952 // Now that the record is complete, do any delayed exception spec checks 8953 // we were missing. 8954 while (!DelayedDestructorExceptionSpecChecks.empty()) { 8955 const CXXDestructorDecl *Dtor = 8956 DelayedDestructorExceptionSpecChecks.back().first; 8957 if (Dtor->getParent() != Record) 8958 break; 8959 8960 assert(!Dtor->getParent()->isDependentType() && 8961 "Should not ever add destructors of templates into the list."); 8962 CheckOverridingFunctionExceptionSpec(Dtor, 8963 DelayedDestructorExceptionSpecChecks.back().second); 8964 DelayedDestructorExceptionSpecChecks.pop_back(); 8965 } 8966 8967 } else { 8968 ObjCIvarDecl **ClsFields = 8969 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 8970 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 8971 ID->setLocEnd(RBrac); 8972 // Add ivar's to class's DeclContext. 8973 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8974 ClsFields[i]->setLexicalDeclContext(ID); 8975 ID->addDecl(ClsFields[i]); 8976 } 8977 // Must enforce the rule that ivars in the base classes may not be 8978 // duplicates. 8979 if (ID->getSuperClass()) 8980 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 8981 } else if (ObjCImplementationDecl *IMPDecl = 8982 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8983 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 8984 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 8985 // Ivar declared in @implementation never belongs to the implementation. 8986 // Only it is in implementation's lexical context. 8987 ClsFields[I]->setLexicalDeclContext(IMPDecl); 8988 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 8989 } else if (ObjCCategoryDecl *CDecl = 8990 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8991 // case of ivars in class extension; all other cases have been 8992 // reported as errors elsewhere. 8993 // FIXME. Class extension does not have a LocEnd field. 8994 // CDecl->setLocEnd(RBrac); 8995 // Add ivar's to class extension's DeclContext. 8996 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8997 ClsFields[i]->setLexicalDeclContext(CDecl); 8998 CDecl->addDecl(ClsFields[i]); 8999 } 9000 } 9001 } 9002 9003 if (Attr) 9004 ProcessDeclAttributeList(S, Record, Attr); 9005 9006 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9007 // set the visibility of this record. 9008 if (Record && !Record->getDeclContext()->isRecord()) 9009 AddPushedVisibilityAttribute(Record); 9010} 9011 9012/// \brief Determine whether the given integral value is representable within 9013/// the given type T. 9014static bool isRepresentableIntegerValue(ASTContext &Context, 9015 llvm::APSInt &Value, 9016 QualType T) { 9017 assert(T->isIntegralType(Context) && "Integral type required!"); 9018 unsigned BitWidth = Context.getIntWidth(T); 9019 9020 if (Value.isUnsigned() || Value.isNonNegative()) { 9021 if (T->isSignedIntegerOrEnumerationType()) 9022 --BitWidth; 9023 return Value.getActiveBits() <= BitWidth; 9024 } 9025 return Value.getMinSignedBits() <= BitWidth; 9026} 9027 9028// \brief Given an integral type, return the next larger integral type 9029// (or a NULL type of no such type exists). 9030static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9031 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9032 // enum checking below. 9033 assert(T->isIntegralType(Context) && "Integral type required!"); 9034 const unsigned NumTypes = 4; 9035 QualType SignedIntegralTypes[NumTypes] = { 9036 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9037 }; 9038 QualType UnsignedIntegralTypes[NumTypes] = { 9039 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9040 Context.UnsignedLongLongTy 9041 }; 9042 9043 unsigned BitWidth = Context.getTypeSize(T); 9044 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9045 : UnsignedIntegralTypes; 9046 for (unsigned I = 0; I != NumTypes; ++I) 9047 if (Context.getTypeSize(Types[I]) > BitWidth) 9048 return Types[I]; 9049 9050 return QualType(); 9051} 9052 9053EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9054 EnumConstantDecl *LastEnumConst, 9055 SourceLocation IdLoc, 9056 IdentifierInfo *Id, 9057 Expr *Val) { 9058 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9059 llvm::APSInt EnumVal(IntWidth); 9060 QualType EltTy; 9061 9062 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9063 Val = 0; 9064 9065 if (Val) { 9066 if (Enum->isDependentType() || Val->isTypeDependent()) 9067 EltTy = Context.DependentTy; 9068 else { 9069 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9070 SourceLocation ExpLoc; 9071 if (!Val->isValueDependent() && 9072 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9073 Val = 0; 9074 } else { 9075 if (!getLangOptions().CPlusPlus) { 9076 // C99 6.7.2.2p2: 9077 // The expression that defines the value of an enumeration constant 9078 // shall be an integer constant expression that has a value 9079 // representable as an int. 9080 9081 // Complain if the value is not representable in an int. 9082 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9083 Diag(IdLoc, diag::ext_enum_value_not_int) 9084 << EnumVal.toString(10) << Val->getSourceRange() 9085 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9086 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9087 // Force the type of the expression to 'int'. 9088 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9089 } 9090 } 9091 9092 if (Enum->isFixed()) { 9093 EltTy = Enum->getIntegerType(); 9094 9095 // C++0x [dcl.enum]p5: 9096 // ... if the initializing value of an enumerator cannot be 9097 // represented by the underlying type, the program is ill-formed. 9098 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9099 if (getLangOptions().MicrosoftExt) { 9100 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9101 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9102 } else 9103 Diag(IdLoc, diag::err_enumerator_too_large) 9104 << EltTy; 9105 } else 9106 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9107 } 9108 else { 9109 // C++0x [dcl.enum]p5: 9110 // If the underlying type is not fixed, the type of each enumerator 9111 // is the type of its initializing value: 9112 // - If an initializer is specified for an enumerator, the 9113 // initializing value has the same type as the expression. 9114 EltTy = Val->getType(); 9115 } 9116 } 9117 } 9118 } 9119 9120 if (!Val) { 9121 if (Enum->isDependentType()) 9122 EltTy = Context.DependentTy; 9123 else if (!LastEnumConst) { 9124 // C++0x [dcl.enum]p5: 9125 // If the underlying type is not fixed, the type of each enumerator 9126 // is the type of its initializing value: 9127 // - If no initializer is specified for the first enumerator, the 9128 // initializing value has an unspecified integral type. 9129 // 9130 // GCC uses 'int' for its unspecified integral type, as does 9131 // C99 6.7.2.2p3. 9132 if (Enum->isFixed()) { 9133 EltTy = Enum->getIntegerType(); 9134 } 9135 else { 9136 EltTy = Context.IntTy; 9137 } 9138 } else { 9139 // Assign the last value + 1. 9140 EnumVal = LastEnumConst->getInitVal(); 9141 ++EnumVal; 9142 EltTy = LastEnumConst->getType(); 9143 9144 // Check for overflow on increment. 9145 if (EnumVal < LastEnumConst->getInitVal()) { 9146 // C++0x [dcl.enum]p5: 9147 // If the underlying type is not fixed, the type of each enumerator 9148 // is the type of its initializing value: 9149 // 9150 // - Otherwise the type of the initializing value is the same as 9151 // the type of the initializing value of the preceding enumerator 9152 // unless the incremented value is not representable in that type, 9153 // in which case the type is an unspecified integral type 9154 // sufficient to contain the incremented value. If no such type 9155 // exists, the program is ill-formed. 9156 QualType T = getNextLargerIntegralType(Context, EltTy); 9157 if (T.isNull() || Enum->isFixed()) { 9158 // There is no integral type larger enough to represent this 9159 // value. Complain, then allow the value to wrap around. 9160 EnumVal = LastEnumConst->getInitVal(); 9161 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9162 ++EnumVal; 9163 if (Enum->isFixed()) 9164 // When the underlying type is fixed, this is ill-formed. 9165 Diag(IdLoc, diag::err_enumerator_wrapped) 9166 << EnumVal.toString(10) 9167 << EltTy; 9168 else 9169 Diag(IdLoc, diag::warn_enumerator_too_large) 9170 << EnumVal.toString(10); 9171 } else { 9172 EltTy = T; 9173 } 9174 9175 // Retrieve the last enumerator's value, extent that type to the 9176 // type that is supposed to be large enough to represent the incremented 9177 // value, then increment. 9178 EnumVal = LastEnumConst->getInitVal(); 9179 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9180 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9181 ++EnumVal; 9182 9183 // If we're not in C++, diagnose the overflow of enumerator values, 9184 // which in C99 means that the enumerator value is not representable in 9185 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9186 // permits enumerator values that are representable in some larger 9187 // integral type. 9188 if (!getLangOptions().CPlusPlus && !T.isNull()) 9189 Diag(IdLoc, diag::warn_enum_value_overflow); 9190 } else if (!getLangOptions().CPlusPlus && 9191 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9192 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9193 Diag(IdLoc, diag::ext_enum_value_not_int) 9194 << EnumVal.toString(10) << 1; 9195 } 9196 } 9197 } 9198 9199 if (!EltTy->isDependentType()) { 9200 // Make the enumerator value match the signedness and size of the 9201 // enumerator's type. 9202 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9203 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9204 } 9205 9206 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9207 Val, EnumVal); 9208} 9209 9210 9211Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9212 SourceLocation IdLoc, IdentifierInfo *Id, 9213 AttributeList *Attr, 9214 SourceLocation EqualLoc, Expr *val) { 9215 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9216 EnumConstantDecl *LastEnumConst = 9217 cast_or_null<EnumConstantDecl>(lastEnumConst); 9218 Expr *Val = static_cast<Expr*>(val); 9219 9220 // The scope passed in may not be a decl scope. Zip up the scope tree until 9221 // we find one that is. 9222 S = getNonFieldDeclScope(S); 9223 9224 // Verify that there isn't already something declared with this name in this 9225 // scope. 9226 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9227 ForRedeclaration); 9228 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9229 // Maybe we will complain about the shadowed template parameter. 9230 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9231 // Just pretend that we didn't see the previous declaration. 9232 PrevDecl = 0; 9233 } 9234 9235 if (PrevDecl) { 9236 // When in C++, we may get a TagDecl with the same name; in this case the 9237 // enum constant will 'hide' the tag. 9238 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9239 "Received TagDecl when not in C++!"); 9240 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9241 if (isa<EnumConstantDecl>(PrevDecl)) 9242 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9243 else 9244 Diag(IdLoc, diag::err_redefinition) << Id; 9245 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9246 return 0; 9247 } 9248 } 9249 9250 // C++ [class.mem]p13: 9251 // If T is the name of a class, then each of the following shall have a 9252 // name different from T: 9253 // - every enumerator of every member of class T that is an enumerated 9254 // type 9255 if (CXXRecordDecl *Record 9256 = dyn_cast<CXXRecordDecl>( 9257 TheEnumDecl->getDeclContext()->getRedeclContext())) 9258 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9259 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9260 9261 EnumConstantDecl *New = 9262 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9263 9264 if (New) { 9265 // Process attributes. 9266 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9267 9268 // Register this decl in the current scope stack. 9269 New->setAccess(TheEnumDecl->getAccess()); 9270 PushOnScopeChains(New, S); 9271 } 9272 9273 return New; 9274} 9275 9276void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9277 SourceLocation RBraceLoc, Decl *EnumDeclX, 9278 Decl **Elements, unsigned NumElements, 9279 Scope *S, AttributeList *Attr) { 9280 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9281 QualType EnumType = Context.getTypeDeclType(Enum); 9282 9283 if (Attr) 9284 ProcessDeclAttributeList(S, Enum, Attr); 9285 9286 if (Enum->isDependentType()) { 9287 for (unsigned i = 0; i != NumElements; ++i) { 9288 EnumConstantDecl *ECD = 9289 cast_or_null<EnumConstantDecl>(Elements[i]); 9290 if (!ECD) continue; 9291 9292 ECD->setType(EnumType); 9293 } 9294 9295 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9296 return; 9297 } 9298 9299 // TODO: If the result value doesn't fit in an int, it must be a long or long 9300 // long value. ISO C does not support this, but GCC does as an extension, 9301 // emit a warning. 9302 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9303 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9304 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9305 9306 // Verify that all the values are okay, compute the size of the values, and 9307 // reverse the list. 9308 unsigned NumNegativeBits = 0; 9309 unsigned NumPositiveBits = 0; 9310 9311 // Keep track of whether all elements have type int. 9312 bool AllElementsInt = true; 9313 9314 for (unsigned i = 0; i != NumElements; ++i) { 9315 EnumConstantDecl *ECD = 9316 cast_or_null<EnumConstantDecl>(Elements[i]); 9317 if (!ECD) continue; // Already issued a diagnostic. 9318 9319 const llvm::APSInt &InitVal = ECD->getInitVal(); 9320 9321 // Keep track of the size of positive and negative values. 9322 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9323 NumPositiveBits = std::max(NumPositiveBits, 9324 (unsigned)InitVal.getActiveBits()); 9325 else 9326 NumNegativeBits = std::max(NumNegativeBits, 9327 (unsigned)InitVal.getMinSignedBits()); 9328 9329 // Keep track of whether every enum element has type int (very commmon). 9330 if (AllElementsInt) 9331 AllElementsInt = ECD->getType() == Context.IntTy; 9332 } 9333 9334 // Figure out the type that should be used for this enum. 9335 QualType BestType; 9336 unsigned BestWidth; 9337 9338 // C++0x N3000 [conv.prom]p3: 9339 // An rvalue of an unscoped enumeration type whose underlying 9340 // type is not fixed can be converted to an rvalue of the first 9341 // of the following types that can represent all the values of 9342 // the enumeration: int, unsigned int, long int, unsigned long 9343 // int, long long int, or unsigned long long int. 9344 // C99 6.4.4.3p2: 9345 // An identifier declared as an enumeration constant has type int. 9346 // The C99 rule is modified by a gcc extension 9347 QualType BestPromotionType; 9348 9349 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9350 // -fshort-enums is the equivalent to specifying the packed attribute on all 9351 // enum definitions. 9352 if (LangOpts.ShortEnums) 9353 Packed = true; 9354 9355 if (Enum->isFixed()) { 9356 BestType = BestPromotionType = Enum->getIntegerType(); 9357 // We don't need to set BestWidth, because BestType is going to be the type 9358 // of the enumerators, but we do anyway because otherwise some compilers 9359 // warn that it might be used uninitialized. 9360 BestWidth = CharWidth; 9361 } 9362 else if (NumNegativeBits) { 9363 // If there is a negative value, figure out the smallest integer type (of 9364 // int/long/longlong) that fits. 9365 // If it's packed, check also if it fits a char or a short. 9366 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9367 BestType = Context.SignedCharTy; 9368 BestWidth = CharWidth; 9369 } else if (Packed && NumNegativeBits <= ShortWidth && 9370 NumPositiveBits < ShortWidth) { 9371 BestType = Context.ShortTy; 9372 BestWidth = ShortWidth; 9373 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9374 BestType = Context.IntTy; 9375 BestWidth = IntWidth; 9376 } else { 9377 BestWidth = Context.getTargetInfo().getLongWidth(); 9378 9379 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9380 BestType = Context.LongTy; 9381 } else { 9382 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9383 9384 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9385 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9386 BestType = Context.LongLongTy; 9387 } 9388 } 9389 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9390 } else { 9391 // If there is no negative value, figure out the smallest type that fits 9392 // all of the enumerator values. 9393 // If it's packed, check also if it fits a char or a short. 9394 if (Packed && NumPositiveBits <= CharWidth) { 9395 BestType = Context.UnsignedCharTy; 9396 BestPromotionType = Context.IntTy; 9397 BestWidth = CharWidth; 9398 } else if (Packed && NumPositiveBits <= ShortWidth) { 9399 BestType = Context.UnsignedShortTy; 9400 BestPromotionType = Context.IntTy; 9401 BestWidth = ShortWidth; 9402 } else if (NumPositiveBits <= IntWidth) { 9403 BestType = Context.UnsignedIntTy; 9404 BestWidth = IntWidth; 9405 BestPromotionType 9406 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9407 ? Context.UnsignedIntTy : Context.IntTy; 9408 } else if (NumPositiveBits <= 9409 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9410 BestType = Context.UnsignedLongTy; 9411 BestPromotionType 9412 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9413 ? Context.UnsignedLongTy : Context.LongTy; 9414 } else { 9415 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9416 assert(NumPositiveBits <= BestWidth && 9417 "How could an initializer get larger than ULL?"); 9418 BestType = Context.UnsignedLongLongTy; 9419 BestPromotionType 9420 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9421 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9422 } 9423 } 9424 9425 // Loop over all of the enumerator constants, changing their types to match 9426 // the type of the enum if needed. 9427 for (unsigned i = 0; i != NumElements; ++i) { 9428 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9429 if (!ECD) continue; // Already issued a diagnostic. 9430 9431 // Standard C says the enumerators have int type, but we allow, as an 9432 // extension, the enumerators to be larger than int size. If each 9433 // enumerator value fits in an int, type it as an int, otherwise type it the 9434 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9435 // that X has type 'int', not 'unsigned'. 9436 9437 // Determine whether the value fits into an int. 9438 llvm::APSInt InitVal = ECD->getInitVal(); 9439 9440 // If it fits into an integer type, force it. Otherwise force it to match 9441 // the enum decl type. 9442 QualType NewTy; 9443 unsigned NewWidth; 9444 bool NewSign; 9445 if (!getLangOptions().CPlusPlus && 9446 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9447 NewTy = Context.IntTy; 9448 NewWidth = IntWidth; 9449 NewSign = true; 9450 } else if (ECD->getType() == BestType) { 9451 // Already the right type! 9452 if (getLangOptions().CPlusPlus) 9453 // C++ [dcl.enum]p4: Following the closing brace of an 9454 // enum-specifier, each enumerator has the type of its 9455 // enumeration. 9456 ECD->setType(EnumType); 9457 continue; 9458 } else { 9459 NewTy = BestType; 9460 NewWidth = BestWidth; 9461 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9462 } 9463 9464 // Adjust the APSInt value. 9465 InitVal = InitVal.extOrTrunc(NewWidth); 9466 InitVal.setIsSigned(NewSign); 9467 ECD->setInitVal(InitVal); 9468 9469 // Adjust the Expr initializer and type. 9470 if (ECD->getInitExpr() && 9471 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9472 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9473 CK_IntegralCast, 9474 ECD->getInitExpr(), 9475 /*base paths*/ 0, 9476 VK_RValue)); 9477 if (getLangOptions().CPlusPlus) 9478 // C++ [dcl.enum]p4: Following the closing brace of an 9479 // enum-specifier, each enumerator has the type of its 9480 // enumeration. 9481 ECD->setType(EnumType); 9482 else 9483 ECD->setType(NewTy); 9484 } 9485 9486 Enum->completeDefinition(BestType, BestPromotionType, 9487 NumPositiveBits, NumNegativeBits); 9488} 9489 9490Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9491 SourceLocation StartLoc, 9492 SourceLocation EndLoc) { 9493 StringLiteral *AsmString = cast<StringLiteral>(expr); 9494 9495 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9496 AsmString, StartLoc, 9497 EndLoc); 9498 CurContext->addDecl(New); 9499 return New; 9500} 9501 9502DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, 9503 IdentifierInfo &ModuleName, 9504 SourceLocation ModuleNameLoc) { 9505 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc, 9506 ModuleName, ModuleNameLoc); 9507 if (!Module) 9508 return true; 9509 9510 // FIXME: Actually create a declaration to describe the module import. 9511 (void)Module; 9512 return DeclResult((Decl *)0); 9513} 9514 9515void 9516Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old, 9517 SourceLocation ModulePrivateKeyword) { 9518 assert(!Old->isModulePrivate() && "Old is module-private!"); 9519 9520 Diag(New->getLocation(), diag::err_module_private_follows_public) 9521 << New->getDeclName() << SourceRange(ModulePrivateKeyword); 9522 Diag(Old->getLocation(), diag::note_previous_declaration) 9523 << Old->getDeclName(); 9524 9525 // Drop the __module_private__ from the new declaration, since it's invalid. 9526 New->setModulePrivate(false); 9527} 9528 9529void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9530 SourceLocation PragmaLoc, 9531 SourceLocation NameLoc) { 9532 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9533 9534 if (PrevDecl) { 9535 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9536 } else { 9537 (void)WeakUndeclaredIdentifiers.insert( 9538 std::pair<IdentifierInfo*,WeakInfo> 9539 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9540 } 9541} 9542 9543void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9544 IdentifierInfo* AliasName, 9545 SourceLocation PragmaLoc, 9546 SourceLocation NameLoc, 9547 SourceLocation AliasNameLoc) { 9548 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9549 LookupOrdinaryName); 9550 WeakInfo W = WeakInfo(Name, NameLoc); 9551 9552 if (PrevDecl) { 9553 if (!PrevDecl->hasAttr<AliasAttr>()) 9554 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9555 DeclApplyPragmaWeak(TUScope, ND, W); 9556 } else { 9557 (void)WeakUndeclaredIdentifiers.insert( 9558 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9559 } 9560} 9561 9562Decl *Sema::getObjCDeclContext() const { 9563 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9564} 9565