SemaDecl.cpp revision a28948f34817476d02412fa204cae038e228c827
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 "llvm/ADT/Triple.h" 42#include <algorithm> 43#include <cstring> 44#include <functional> 45using namespace clang; 46using namespace sema; 47 48Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 49 if (OwnedType) { 50 Decl *Group[2] = { OwnedType, Ptr }; 51 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 52 } 53 54 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 55} 56 57/// \brief If the identifier refers to a type name within this scope, 58/// return the declaration of that type. 59/// 60/// This routine performs ordinary name lookup of the identifier II 61/// within the given scope, with optional C++ scope specifier SS, to 62/// determine whether the name refers to a type. If so, returns an 63/// opaque pointer (actually a QualType) corresponding to that 64/// type. Otherwise, returns NULL. 65/// 66/// If name lookup results in an ambiguity, this routine will complain 67/// and then return NULL. 68ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 69 Scope *S, CXXScopeSpec *SS, 70 bool isClassName, bool HasTrailingDot, 71 ParsedType ObjectTypePtr, 72 bool WantNontrivialTypeSourceInfo) { 73 // Determine where we will perform name lookup. 74 DeclContext *LookupCtx = 0; 75 if (ObjectTypePtr) { 76 QualType ObjectType = ObjectTypePtr.get(); 77 if (ObjectType->isRecordType()) 78 LookupCtx = computeDeclContext(ObjectType); 79 } else if (SS && SS->isNotEmpty()) { 80 LookupCtx = computeDeclContext(*SS, false); 81 82 if (!LookupCtx) { 83 if (isDependentScopeSpecifier(*SS)) { 84 // C++ [temp.res]p3: 85 // A qualified-id that refers to a type and in which the 86 // nested-name-specifier depends on a template-parameter (14.6.2) 87 // shall be prefixed by the keyword typename to indicate that the 88 // qualified-id denotes a type, forming an 89 // elaborated-type-specifier (7.1.5.3). 90 // 91 // We therefore do not perform any name lookup if the result would 92 // refer to a member of an unknown specialization. 93 if (!isClassName) 94 return ParsedType(); 95 96 // We know from the grammar that this name refers to a type, 97 // so build a dependent node to describe the type. 98 if (WantNontrivialTypeSourceInfo) 99 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 100 101 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 102 QualType T = 103 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 104 II, NameLoc); 105 106 return ParsedType::make(T); 107 } 108 109 return ParsedType(); 110 } 111 112 if (!LookupCtx->isDependentContext() && 113 RequireCompleteDeclContext(*SS, LookupCtx)) 114 return ParsedType(); 115 } 116 117 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 118 // lookup for class-names. 119 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 120 LookupOrdinaryName; 121 LookupResult Result(*this, &II, NameLoc, Kind); 122 if (LookupCtx) { 123 // Perform "qualified" name lookup into the declaration context we 124 // computed, which is either the type of the base of a member access 125 // expression or the declaration context associated with a prior 126 // nested-name-specifier. 127 LookupQualifiedName(Result, LookupCtx); 128 129 if (ObjectTypePtr && Result.empty()) { 130 // C++ [basic.lookup.classref]p3: 131 // If the unqualified-id is ~type-name, the type-name is looked up 132 // in the context of the entire postfix-expression. If the type T of 133 // the object expression is of a class type C, the type-name is also 134 // looked up in the scope of class C. At least one of the lookups shall 135 // find a name that refers to (possibly cv-qualified) T. 136 LookupName(Result, S); 137 } 138 } else { 139 // Perform unqualified name lookup. 140 LookupName(Result, S); 141 } 142 143 NamedDecl *IIDecl = 0; 144 switch (Result.getResultKind()) { 145 case LookupResult::NotFound: 146 case LookupResult::NotFoundInCurrentInstantiation: 147 case LookupResult::FoundOverloaded: 148 case LookupResult::FoundUnresolvedValue: 149 Result.suppressDiagnostics(); 150 return ParsedType(); 151 152 case LookupResult::Ambiguous: 153 // Recover from type-hiding ambiguities by hiding the type. We'll 154 // do the lookup again when looking for an object, and we can 155 // diagnose the error then. If we don't do this, then the error 156 // about hiding the type will be immediately followed by an error 157 // that only makes sense if the identifier was treated like a type. 158 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 159 Result.suppressDiagnostics(); 160 return ParsedType(); 161 } 162 163 // Look to see if we have a type anywhere in the list of results. 164 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 165 Res != ResEnd; ++Res) { 166 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 167 if (!IIDecl || 168 (*Res)->getLocation().getRawEncoding() < 169 IIDecl->getLocation().getRawEncoding()) 170 IIDecl = *Res; 171 } 172 } 173 174 if (!IIDecl) { 175 // None of the entities we found is a type, so there is no way 176 // to even assume that the result is a type. In this case, don't 177 // complain about the ambiguity. The parser will either try to 178 // perform this lookup again (e.g., as an object name), which 179 // will produce the ambiguity, or will complain that it expected 180 // a type name. 181 Result.suppressDiagnostics(); 182 return ParsedType(); 183 } 184 185 // We found a type within the ambiguous lookup; diagnose the 186 // ambiguity and then return that type. This might be the right 187 // answer, or it might not be, but it suppresses any attempt to 188 // perform the name lookup again. 189 break; 190 191 case LookupResult::Found: 192 IIDecl = Result.getFoundDecl(); 193 break; 194 } 195 196 assert(IIDecl && "Didn't find decl"); 197 198 QualType T; 199 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 200 DiagnoseUseOfDecl(IIDecl, NameLoc); 201 202 if (T.isNull()) 203 T = Context.getTypeDeclType(TD); 204 205 if (SS && SS->isNotEmpty()) { 206 if (WantNontrivialTypeSourceInfo) { 207 // Construct a type with type-source information. 208 TypeLocBuilder Builder; 209 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 210 211 T = getElaboratedType(ETK_None, *SS, T); 212 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 213 ElabTL.setKeywordLoc(SourceLocation()); 214 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 215 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 216 } else { 217 T = getElaboratedType(ETK_None, *SS, T); 218 } 219 } 220 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 221 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 222 if (!HasTrailingDot) 223 T = Context.getObjCInterfaceType(IDecl); 224 } 225 226 if (T.isNull()) { 227 // If it's not plausibly a type, suppress diagnostics. 228 Result.suppressDiagnostics(); 229 return ParsedType(); 230 } 231 return ParsedType::make(T); 232} 233 234/// isTagName() - This method is called *for error recovery purposes only* 235/// to determine if the specified name is a valid tag name ("struct foo"). If 236/// so, this returns the TST for the tag corresponding to it (TST_enum, 237/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 238/// where the user forgot to specify the tag. 239DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 240 // Do a tag name lookup in this scope. 241 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 242 LookupName(R, S, false); 243 R.suppressDiagnostics(); 244 if (R.getResultKind() == LookupResult::Found) 245 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 246 switch (TD->getTagKind()) { 247 default: return DeclSpec::TST_unspecified; 248 case TTK_Struct: return DeclSpec::TST_struct; 249 case TTK_Union: return DeclSpec::TST_union; 250 case TTK_Class: return DeclSpec::TST_class; 251 case TTK_Enum: return DeclSpec::TST_enum; 252 } 253 } 254 255 return DeclSpec::TST_unspecified; 256} 257 258/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 259/// if a CXXScopeSpec's type is equal to the type of one of the base classes 260/// then downgrade the missing typename error to a warning. 261/// This is needed for MSVC compatibility; Example: 262/// @code 263/// template<class T> class A { 264/// public: 265/// typedef int TYPE; 266/// }; 267/// template<class T> class B : public A<T> { 268/// public: 269/// A<T>::TYPE a; // no typename required because A<T> is a base class. 270/// }; 271/// @endcode 272bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS) { 273 if (CurContext->isRecord()) { 274 const Type *Ty = SS->getScopeRep()->getAsType(); 275 276 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 277 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 278 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 279 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 280 return true; 281 } 282 return false; 283} 284 285bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 286 SourceLocation IILoc, 287 Scope *S, 288 CXXScopeSpec *SS, 289 ParsedType &SuggestedType) { 290 // We don't have anything to suggest (yet). 291 SuggestedType = ParsedType(); 292 293 // There may have been a typo in the name of the type. Look up typo 294 // results, in case we have something that we can suggest. 295 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 296 LookupOrdinaryName, S, SS, NULL, 297 false, CTC_Type)) { 298 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 299 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 300 301 if (Corrected.isKeyword()) { 302 // We corrected to a keyword. 303 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 304 Diag(IILoc, diag::err_unknown_typename_suggest) 305 << &II << CorrectedQuotedStr; 306 return true; 307 } else { 308 NamedDecl *Result = Corrected.getCorrectionDecl(); 309 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 310 !Result->isInvalidDecl()) { 311 // We found a similarly-named type or interface; suggest that. 312 if (!SS || !SS->isSet()) 313 Diag(IILoc, diag::err_unknown_typename_suggest) 314 << &II << CorrectedQuotedStr 315 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 316 else if (DeclContext *DC = computeDeclContext(*SS, false)) 317 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 318 << &II << DC << CorrectedQuotedStr << SS->getRange() 319 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 320 else 321 llvm_unreachable("could not have corrected a typo here"); 322 323 Diag(Result->getLocation(), diag::note_previous_decl) 324 << CorrectedQuotedStr; 325 326 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 327 false, false, ParsedType(), 328 /*NonTrivialTypeSourceInfo=*/true); 329 return true; 330 } 331 } 332 } 333 334 if (getLangOptions().CPlusPlus) { 335 // See if II is a class template that the user forgot to pass arguments to. 336 UnqualifiedId Name; 337 Name.setIdentifier(&II, IILoc); 338 CXXScopeSpec EmptySS; 339 TemplateTy TemplateResult; 340 bool MemberOfUnknownSpecialization; 341 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 342 Name, ParsedType(), true, TemplateResult, 343 MemberOfUnknownSpecialization) == TNK_Type_template) { 344 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 345 Diag(IILoc, diag::err_template_missing_args) << TplName; 346 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 347 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 348 << TplDecl->getTemplateParameters()->getSourceRange(); 349 } 350 return true; 351 } 352 } 353 354 // FIXME: Should we move the logic that tries to recover from a missing tag 355 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 356 357 if (!SS || (!SS->isSet() && !SS->isInvalid())) 358 Diag(IILoc, diag::err_unknown_typename) << &II; 359 else if (DeclContext *DC = computeDeclContext(*SS, false)) 360 Diag(IILoc, diag::err_typename_nested_not_found) 361 << &II << DC << SS->getRange(); 362 else if (isDependentScopeSpecifier(*SS)) { 363 unsigned DiagID = diag::err_typename_missing; 364 if (getLangOptions().Microsoft && isMicrosoftMissingTypename(SS)) 365 DiagID = diag::warn_typename_missing; 366 367 Diag(SS->getRange().getBegin(), DiagID) 368 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 369 << SourceRange(SS->getRange().getBegin(), IILoc) 370 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 371 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 372 } else { 373 assert(SS && SS->isInvalid() && 374 "Invalid scope specifier has already been diagnosed"); 375 } 376 377 return true; 378} 379 380/// \brief Determine whether the given result set contains either a type name 381/// or 382static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 383 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 384 NextToken.is(tok::less); 385 386 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 387 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 388 return true; 389 390 if (CheckTemplate && isa<TemplateDecl>(*I)) 391 return true; 392 } 393 394 return false; 395} 396 397Sema::NameClassification Sema::ClassifyName(Scope *S, 398 CXXScopeSpec &SS, 399 IdentifierInfo *&Name, 400 SourceLocation NameLoc, 401 const Token &NextToken) { 402 DeclarationNameInfo NameInfo(Name, NameLoc); 403 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 404 405 if (NextToken.is(tok::coloncolon)) { 406 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 407 QualType(), false, SS, 0, false); 408 409 } 410 411 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 412 LookupParsedName(Result, S, &SS, !CurMethod); 413 414 // Perform lookup for Objective-C instance variables (including automatically 415 // synthesized instance variables), if we're in an Objective-C method. 416 // FIXME: This lookup really, really needs to be folded in to the normal 417 // unqualified lookup mechanism. 418 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 419 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 420 if (E.get() || E.isInvalid()) 421 return E; 422 423 // Synthesize ivars lazily. 424 if (getLangOptions().ObjCDefaultSynthProperties && 425 getLangOptions().ObjCNonFragileABI2) { 426 if (SynthesizeProvisionalIvar(Result, Name, NameLoc)) { 427 if (const ObjCPropertyDecl *Property = 428 canSynthesizeProvisionalIvar(Name)) { 429 Diag(NameLoc, diag::warn_synthesized_ivar_access) << Name; 430 Diag(Property->getLocation(), diag::note_property_declare); 431 } 432 433 // FIXME: This is strange. Shouldn't we just take the ivar returned 434 // from SynthesizeProvisionalIvar and continue with that? 435 E = LookupInObjCMethod(Result, S, Name, true); 436 if (E.get() || E.isInvalid()) 437 return E; 438 } 439 } 440 } 441 442 bool SecondTry = false; 443 bool IsFilteredTemplateName = false; 444 445Corrected: 446 switch (Result.getResultKind()) { 447 case LookupResult::NotFound: 448 // If an unqualified-id is followed by a '(', then we have a function 449 // call. 450 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 451 // In C++, this is an ADL-only call. 452 // FIXME: Reference? 453 if (getLangOptions().CPlusPlus) 454 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 455 456 // C90 6.3.2.2: 457 // If the expression that precedes the parenthesized argument list in a 458 // function call consists solely of an identifier, and if no 459 // declaration is visible for this identifier, the identifier is 460 // implicitly declared exactly as if, in the innermost block containing 461 // the function call, the declaration 462 // 463 // extern int identifier (); 464 // 465 // appeared. 466 // 467 // We also allow this in C99 as an extension. 468 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 469 Result.addDecl(D); 470 Result.resolveKind(); 471 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 472 } 473 } 474 475 // In C, we first see whether there is a tag type by the same name, in 476 // which case it's likely that the user just forget to write "enum", 477 // "struct", or "union". 478 if (!getLangOptions().CPlusPlus && !SecondTry) { 479 Result.clear(LookupTagName); 480 LookupParsedName(Result, S, &SS); 481 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 482 const char *TagName = 0; 483 const char *FixItTagName = 0; 484 switch (Tag->getTagKind()) { 485 case TTK_Class: 486 TagName = "class"; 487 FixItTagName = "class "; 488 break; 489 490 case TTK_Enum: 491 TagName = "enum"; 492 FixItTagName = "enum "; 493 break; 494 495 case TTK_Struct: 496 TagName = "struct"; 497 FixItTagName = "struct "; 498 break; 499 500 case TTK_Union: 501 TagName = "union"; 502 FixItTagName = "union "; 503 break; 504 } 505 506 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 507 << Name << TagName << getLangOptions().CPlusPlus 508 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 509 break; 510 } 511 512 Result.clear(LookupOrdinaryName); 513 } 514 515 // Perform typo correction to determine if there is another name that is 516 // close to this name. 517 if (!SecondTry) { 518 SecondTry = true; 519 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 520 Result.getLookupKind(), S, &SS)) { 521 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 522 unsigned QualifiedDiag = diag::err_no_member_suggest; 523 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 524 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 525 526 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 527 NamedDecl *UnderlyingFirstDecl 528 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 529 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 530 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 531 UnqualifiedDiag = diag::err_no_template_suggest; 532 QualifiedDiag = diag::err_no_member_template_suggest; 533 } else if (UnderlyingFirstDecl && 534 (isa<TypeDecl>(UnderlyingFirstDecl) || 535 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 536 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 537 UnqualifiedDiag = diag::err_unknown_typename_suggest; 538 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 539 } 540 541 if (SS.isEmpty()) 542 Diag(NameLoc, UnqualifiedDiag) 543 << Name << CorrectedQuotedStr 544 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 545 else 546 Diag(NameLoc, QualifiedDiag) 547 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 548 << SS.getRange() 549 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 550 551 // Update the name, so that the caller has the new name. 552 Name = Corrected.getCorrectionAsIdentifierInfo(); 553 554 // Also update the LookupResult... 555 // FIXME: This should probably go away at some point 556 Result.clear(); 557 Result.setLookupName(Corrected.getCorrection()); 558 if (FirstDecl) Result.addDecl(FirstDecl); 559 560 // Typo correction corrected to a keyword. 561 if (Corrected.isKeyword()) 562 return Corrected.getCorrectionAsIdentifierInfo(); 563 564 if (FirstDecl) 565 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 566 << CorrectedQuotedStr; 567 568 // If we found an Objective-C instance variable, let 569 // LookupInObjCMethod build the appropriate expression to 570 // reference the ivar. 571 // FIXME: This is a gross hack. 572 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 573 Result.clear(); 574 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 575 return move(E); 576 } 577 578 goto Corrected; 579 } 580 } 581 582 // We failed to correct; just fall through and let the parser deal with it. 583 Result.suppressDiagnostics(); 584 return NameClassification::Unknown(); 585 586 case LookupResult::NotFoundInCurrentInstantiation: 587 // We performed name lookup into the current instantiation, and there were 588 // dependent bases, so we treat this result the same way as any other 589 // dependent nested-name-specifier. 590 591 // C++ [temp.res]p2: 592 // A name used in a template declaration or definition and that is 593 // dependent on a template-parameter is assumed not to name a type 594 // unless the applicable name lookup finds a type name or the name is 595 // qualified by the keyword typename. 596 // 597 // FIXME: If the next token is '<', we might want to ask the parser to 598 // perform some heroics to see if we actually have a 599 // template-argument-list, which would indicate a missing 'template' 600 // keyword here. 601 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 602 603 case LookupResult::Found: 604 case LookupResult::FoundOverloaded: 605 case LookupResult::FoundUnresolvedValue: 606 break; 607 608 case LookupResult::Ambiguous: 609 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 610 hasAnyAcceptableTemplateNames(Result)) { 611 // C++ [temp.local]p3: 612 // A lookup that finds an injected-class-name (10.2) can result in an 613 // ambiguity in certain cases (for example, if it is found in more than 614 // one base class). If all of the injected-class-names that are found 615 // refer to specializations of the same class template, and if the name 616 // is followed by a template-argument-list, the reference refers to the 617 // class template itself and not a specialization thereof, and is not 618 // ambiguous. 619 // 620 // This filtering can make an ambiguous result into an unambiguous one, 621 // so try again after filtering out template names. 622 FilterAcceptableTemplateNames(Result); 623 if (!Result.isAmbiguous()) { 624 IsFilteredTemplateName = true; 625 break; 626 } 627 } 628 629 // Diagnose the ambiguity and return an error. 630 return NameClassification::Error(); 631 } 632 633 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 634 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 635 // C++ [temp.names]p3: 636 // After name lookup (3.4) finds that a name is a template-name or that 637 // an operator-function-id or a literal- operator-id refers to a set of 638 // overloaded functions any member of which is a function template if 639 // this is followed by a <, the < is always taken as the delimiter of a 640 // template-argument-list and never as the less-than operator. 641 if (!IsFilteredTemplateName) 642 FilterAcceptableTemplateNames(Result); 643 644 if (!Result.empty()) { 645 bool IsFunctionTemplate; 646 TemplateName Template; 647 if (Result.end() - Result.begin() > 1) { 648 IsFunctionTemplate = true; 649 Template = Context.getOverloadedTemplateName(Result.begin(), 650 Result.end()); 651 } else { 652 TemplateDecl *TD 653 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 654 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 655 656 if (SS.isSet() && !SS.isInvalid()) 657 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 658 /*TemplateKeyword=*/false, 659 TD); 660 else 661 Template = TemplateName(TD); 662 } 663 664 if (IsFunctionTemplate) { 665 // Function templates always go through overload resolution, at which 666 // point we'll perform the various checks (e.g., accessibility) we need 667 // to based on which function we selected. 668 Result.suppressDiagnostics(); 669 670 return NameClassification::FunctionTemplate(Template); 671 } 672 673 return NameClassification::TypeTemplate(Template); 674 } 675 } 676 677 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 678 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 679 DiagnoseUseOfDecl(Type, NameLoc); 680 QualType T = Context.getTypeDeclType(Type); 681 return ParsedType::make(T); 682 } 683 684 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 685 if (!Class) { 686 // FIXME: It's unfortunate that we don't have a Type node for handling this. 687 if (ObjCCompatibleAliasDecl *Alias 688 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 689 Class = Alias->getClassInterface(); 690 } 691 692 if (Class) { 693 DiagnoseUseOfDecl(Class, NameLoc); 694 695 if (NextToken.is(tok::period)) { 696 // Interface. <something> is parsed as a property reference expression. 697 // Just return "unknown" as a fall-through for now. 698 Result.suppressDiagnostics(); 699 return NameClassification::Unknown(); 700 } 701 702 QualType T = Context.getObjCInterfaceType(Class); 703 return ParsedType::make(T); 704 } 705 706 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 707 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 708 709 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 710 return BuildDeclarationNameExpr(SS, Result, ADL); 711} 712 713// Determines the context to return to after temporarily entering a 714// context. This depends in an unnecessarily complicated way on the 715// exact ordering of callbacks from the parser. 716DeclContext *Sema::getContainingDC(DeclContext *DC) { 717 718 // Functions defined inline within classes aren't parsed until we've 719 // finished parsing the top-level class, so the top-level class is 720 // the context we'll need to return to. 721 if (isa<FunctionDecl>(DC)) { 722 DC = DC->getLexicalParent(); 723 724 // A function not defined within a class will always return to its 725 // lexical context. 726 if (!isa<CXXRecordDecl>(DC)) 727 return DC; 728 729 // A C++ inline method/friend is parsed *after* the topmost class 730 // it was declared in is fully parsed ("complete"); the topmost 731 // class is the context we need to return to. 732 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 733 DC = RD; 734 735 // Return the declaration context of the topmost class the inline method is 736 // declared in. 737 return DC; 738 } 739 740 return DC->getLexicalParent(); 741} 742 743void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 744 assert(getContainingDC(DC) == CurContext && 745 "The next DeclContext should be lexically contained in the current one."); 746 CurContext = DC; 747 S->setEntity(DC); 748} 749 750void Sema::PopDeclContext() { 751 assert(CurContext && "DeclContext imbalance!"); 752 753 CurContext = getContainingDC(CurContext); 754 assert(CurContext && "Popped translation unit!"); 755} 756 757/// EnterDeclaratorContext - Used when we must lookup names in the context 758/// of a declarator's nested name specifier. 759/// 760void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 761 // C++0x [basic.lookup.unqual]p13: 762 // A name used in the definition of a static data member of class 763 // X (after the qualified-id of the static member) is looked up as 764 // if the name was used in a member function of X. 765 // C++0x [basic.lookup.unqual]p14: 766 // If a variable member of a namespace is defined outside of the 767 // scope of its namespace then any name used in the definition of 768 // the variable member (after the declarator-id) is looked up as 769 // if the definition of the variable member occurred in its 770 // namespace. 771 // Both of these imply that we should push a scope whose context 772 // is the semantic context of the declaration. We can't use 773 // PushDeclContext here because that context is not necessarily 774 // lexically contained in the current context. Fortunately, 775 // the containing scope should have the appropriate information. 776 777 assert(!S->getEntity() && "scope already has entity"); 778 779#ifndef NDEBUG 780 Scope *Ancestor = S->getParent(); 781 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 782 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 783#endif 784 785 CurContext = DC; 786 S->setEntity(DC); 787} 788 789void Sema::ExitDeclaratorContext(Scope *S) { 790 assert(S->getEntity() == CurContext && "Context imbalance!"); 791 792 // Switch back to the lexical context. The safety of this is 793 // enforced by an assert in EnterDeclaratorContext. 794 Scope *Ancestor = S->getParent(); 795 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 796 CurContext = (DeclContext*) Ancestor->getEntity(); 797 798 // We don't need to do anything with the scope, which is going to 799 // disappear. 800} 801 802/// \brief Determine whether we allow overloading of the function 803/// PrevDecl with another declaration. 804/// 805/// This routine determines whether overloading is possible, not 806/// whether some new function is actually an overload. It will return 807/// true in C++ (where we can always provide overloads) or, as an 808/// extension, in C when the previous function is already an 809/// overloaded function declaration or has the "overloadable" 810/// attribute. 811static bool AllowOverloadingOfFunction(LookupResult &Previous, 812 ASTContext &Context) { 813 if (Context.getLangOptions().CPlusPlus) 814 return true; 815 816 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 817 return true; 818 819 return (Previous.getResultKind() == LookupResult::Found 820 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 821} 822 823/// Add this decl to the scope shadowed decl chains. 824void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 825 // Move up the scope chain until we find the nearest enclosing 826 // non-transparent context. The declaration will be introduced into this 827 // scope. 828 while (S->getEntity() && 829 ((DeclContext *)S->getEntity())->isTransparentContext()) 830 S = S->getParent(); 831 832 // Add scoped declarations into their context, so that they can be 833 // found later. Declarations without a context won't be inserted 834 // into any context. 835 if (AddToContext) 836 CurContext->addDecl(D); 837 838 // Out-of-line definitions shouldn't be pushed into scope in C++. 839 // Out-of-line variable and function definitions shouldn't even in C. 840 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 841 D->isOutOfLine()) 842 return; 843 844 // Template instantiations should also not be pushed into scope. 845 if (isa<FunctionDecl>(D) && 846 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 847 return; 848 849 // If this replaces anything in the current scope, 850 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 851 IEnd = IdResolver.end(); 852 for (; I != IEnd; ++I) { 853 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 854 S->RemoveDecl(*I); 855 IdResolver.RemoveDecl(*I); 856 857 // Should only need to replace one decl. 858 break; 859 } 860 } 861 862 S->AddDecl(D); 863 864 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 865 // Implicitly-generated labels may end up getting generated in an order that 866 // isn't strictly lexical, which breaks name lookup. Be careful to insert 867 // the label at the appropriate place in the identifier chain. 868 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 869 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 870 if (IDC == CurContext) { 871 if (!S->isDeclScope(*I)) 872 continue; 873 } else if (IDC->Encloses(CurContext)) 874 break; 875 } 876 877 IdResolver.InsertDeclAfter(I, D); 878 } else { 879 IdResolver.AddDecl(D); 880 } 881} 882 883bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 884 bool ExplicitInstantiationOrSpecialization) { 885 return IdResolver.isDeclInScope(D, Ctx, Context, S, 886 ExplicitInstantiationOrSpecialization); 887} 888 889Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 890 DeclContext *TargetDC = DC->getPrimaryContext(); 891 do { 892 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 893 if (ScopeDC->getPrimaryContext() == TargetDC) 894 return S; 895 } while ((S = S->getParent())); 896 897 return 0; 898} 899 900static bool isOutOfScopePreviousDeclaration(NamedDecl *, 901 DeclContext*, 902 ASTContext&); 903 904/// Filters out lookup results that don't fall within the given scope 905/// as determined by isDeclInScope. 906void Sema::FilterLookupForScope(LookupResult &R, 907 DeclContext *Ctx, Scope *S, 908 bool ConsiderLinkage, 909 bool ExplicitInstantiationOrSpecialization) { 910 LookupResult::Filter F = R.makeFilter(); 911 while (F.hasNext()) { 912 NamedDecl *D = F.next(); 913 914 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 915 continue; 916 917 if (ConsiderLinkage && 918 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 919 continue; 920 921 F.erase(); 922 } 923 924 F.done(); 925} 926 927static bool isUsingDecl(NamedDecl *D) { 928 return isa<UsingShadowDecl>(D) || 929 isa<UnresolvedUsingTypenameDecl>(D) || 930 isa<UnresolvedUsingValueDecl>(D); 931} 932 933/// Removes using shadow declarations from the lookup results. 934static void RemoveUsingDecls(LookupResult &R) { 935 LookupResult::Filter F = R.makeFilter(); 936 while (F.hasNext()) 937 if (isUsingDecl(F.next())) 938 F.erase(); 939 940 F.done(); 941} 942 943/// \brief Check for this common pattern: 944/// @code 945/// class S { 946/// S(const S&); // DO NOT IMPLEMENT 947/// void operator=(const S&); // DO NOT IMPLEMENT 948/// }; 949/// @endcode 950static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 951 // FIXME: Should check for private access too but access is set after we get 952 // the decl here. 953 if (D->doesThisDeclarationHaveABody()) 954 return false; 955 956 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 957 return CD->isCopyConstructor(); 958 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 959 return Method->isCopyAssignmentOperator(); 960 return false; 961} 962 963bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 964 assert(D); 965 966 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 967 return false; 968 969 // Ignore class templates. 970 if (D->getDeclContext()->isDependentContext() || 971 D->getLexicalDeclContext()->isDependentContext()) 972 return false; 973 974 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 975 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 976 return false; 977 978 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 979 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 980 return false; 981 } else { 982 // 'static inline' functions are used in headers; don't warn. 983 if (FD->getStorageClass() == SC_Static && 984 FD->isInlineSpecified()) 985 return false; 986 } 987 988 if (FD->doesThisDeclarationHaveABody() && 989 Context.DeclMustBeEmitted(FD)) 990 return false; 991 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 992 if (!VD->isFileVarDecl() || 993 VD->getType().isConstant(Context) || 994 Context.DeclMustBeEmitted(VD)) 995 return false; 996 997 if (VD->isStaticDataMember() && 998 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 999 return false; 1000 1001 } else { 1002 return false; 1003 } 1004 1005 // Only warn for unused decls internal to the translation unit. 1006 if (D->getLinkage() == ExternalLinkage) 1007 return false; 1008 1009 return true; 1010} 1011 1012void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1013 if (!D) 1014 return; 1015 1016 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1017 const FunctionDecl *First = FD->getFirstDeclaration(); 1018 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1019 return; // First should already be in the vector. 1020 } 1021 1022 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1023 const VarDecl *First = VD->getFirstDeclaration(); 1024 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1025 return; // First should already be in the vector. 1026 } 1027 1028 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1029 UnusedFileScopedDecls.push_back(D); 1030 } 1031 1032static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1033 if (D->isInvalidDecl()) 1034 return false; 1035 1036 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1037 return false; 1038 1039 if (isa<LabelDecl>(D)) 1040 return true; 1041 1042 // White-list anything that isn't a local variable. 1043 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1044 !D->getDeclContext()->isFunctionOrMethod()) 1045 return false; 1046 1047 // Types of valid local variables should be complete, so this should succeed. 1048 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1049 1050 // White-list anything with an __attribute__((unused)) type. 1051 QualType Ty = VD->getType(); 1052 1053 // Only look at the outermost level of typedef. 1054 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1055 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1056 return false; 1057 } 1058 1059 // If we failed to complete the type for some reason, or if the type is 1060 // dependent, don't diagnose the variable. 1061 if (Ty->isIncompleteType() || Ty->isDependentType()) 1062 return false; 1063 1064 if (const TagType *TT = Ty->getAs<TagType>()) { 1065 const TagDecl *Tag = TT->getDecl(); 1066 if (Tag->hasAttr<UnusedAttr>()) 1067 return false; 1068 1069 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1070 // FIXME: Checking for the presence of a user-declared constructor 1071 // isn't completely accurate; we'd prefer to check that the initializer 1072 // has no side effects. 1073 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1074 return false; 1075 } 1076 } 1077 1078 // TODO: __attribute__((unused)) templates? 1079 } 1080 1081 return true; 1082} 1083 1084static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1085 FixItHint &Hint) { 1086 if (isa<LabelDecl>(D)) { 1087 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1088 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1089 if (AfterColon.isInvalid()) 1090 return; 1091 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1092 getCharRange(D->getLocStart(), AfterColon)); 1093 } 1094 return; 1095} 1096 1097/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1098/// unless they are marked attr(unused). 1099void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1100 FixItHint Hint; 1101 if (!ShouldDiagnoseUnusedDecl(D)) 1102 return; 1103 1104 GenerateFixForUnusedDecl(D, Context, Hint); 1105 1106 unsigned DiagID; 1107 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1108 DiagID = diag::warn_unused_exception_param; 1109 else if (isa<LabelDecl>(D)) 1110 DiagID = diag::warn_unused_label; 1111 else 1112 DiagID = diag::warn_unused_variable; 1113 1114 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1115} 1116 1117static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1118 // Verify that we have no forward references left. If so, there was a goto 1119 // or address of a label taken, but no definition of it. Label fwd 1120 // definitions are indicated with a null substmt. 1121 if (L->getStmt() == 0) 1122 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1123} 1124 1125void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1126 if (S->decl_empty()) return; 1127 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1128 "Scope shouldn't contain decls!"); 1129 1130 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1131 I != E; ++I) { 1132 Decl *TmpD = (*I); 1133 assert(TmpD && "This decl didn't get pushed??"); 1134 1135 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1136 NamedDecl *D = cast<NamedDecl>(TmpD); 1137 1138 if (!D->getDeclName()) continue; 1139 1140 // Diagnose unused variables in this scope. 1141 if (!S->hasErrorOccurred()) 1142 DiagnoseUnusedDecl(D); 1143 1144 // If this was a forward reference to a label, verify it was defined. 1145 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1146 CheckPoppedLabel(LD, *this); 1147 1148 // Remove this name from our lexical scope. 1149 IdResolver.RemoveDecl(D); 1150 } 1151} 1152 1153/// \brief Look for an Objective-C class in the translation unit. 1154/// 1155/// \param Id The name of the Objective-C class we're looking for. If 1156/// typo-correction fixes this name, the Id will be updated 1157/// to the fixed name. 1158/// 1159/// \param IdLoc The location of the name in the translation unit. 1160/// 1161/// \param TypoCorrection If true, this routine will attempt typo correction 1162/// if there is no class with the given name. 1163/// 1164/// \returns The declaration of the named Objective-C class, or NULL if the 1165/// class could not be found. 1166ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1167 SourceLocation IdLoc, 1168 bool DoTypoCorrection) { 1169 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1170 // creation from this context. 1171 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1172 1173 if (!IDecl && DoTypoCorrection) { 1174 // Perform typo correction at the given location, but only if we 1175 // find an Objective-C class name. 1176 TypoCorrection C; 1177 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1178 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1179 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1180 Diag(IdLoc, diag::err_undef_interface_suggest) 1181 << Id << IDecl->getDeclName() 1182 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1183 Diag(IDecl->getLocation(), diag::note_previous_decl) 1184 << IDecl->getDeclName(); 1185 1186 Id = IDecl->getIdentifier(); 1187 } 1188 } 1189 1190 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1191} 1192 1193/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1194/// from S, where a non-field would be declared. This routine copes 1195/// with the difference between C and C++ scoping rules in structs and 1196/// unions. For example, the following code is well-formed in C but 1197/// ill-formed in C++: 1198/// @code 1199/// struct S6 { 1200/// enum { BAR } e; 1201/// }; 1202/// 1203/// void test_S6() { 1204/// struct S6 a; 1205/// a.e = BAR; 1206/// } 1207/// @endcode 1208/// For the declaration of BAR, this routine will return a different 1209/// scope. The scope S will be the scope of the unnamed enumeration 1210/// within S6. In C++, this routine will return the scope associated 1211/// with S6, because the enumeration's scope is a transparent 1212/// context but structures can contain non-field names. In C, this 1213/// routine will return the translation unit scope, since the 1214/// enumeration's scope is a transparent context and structures cannot 1215/// contain non-field names. 1216Scope *Sema::getNonFieldDeclScope(Scope *S) { 1217 while (((S->getFlags() & Scope::DeclScope) == 0) || 1218 (S->getEntity() && 1219 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1220 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1221 S = S->getParent(); 1222 return S; 1223} 1224 1225/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1226/// file scope. lazily create a decl for it. ForRedeclaration is true 1227/// if we're creating this built-in in anticipation of redeclaring the 1228/// built-in. 1229NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1230 Scope *S, bool ForRedeclaration, 1231 SourceLocation Loc) { 1232 Builtin::ID BID = (Builtin::ID)bid; 1233 1234 ASTContext::GetBuiltinTypeError Error; 1235 QualType R = Context.GetBuiltinType(BID, Error); 1236 switch (Error) { 1237 case ASTContext::GE_None: 1238 // Okay 1239 break; 1240 1241 case ASTContext::GE_Missing_stdio: 1242 if (ForRedeclaration) 1243 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1244 << Context.BuiltinInfo.GetName(BID); 1245 return 0; 1246 1247 case ASTContext::GE_Missing_setjmp: 1248 if (ForRedeclaration) 1249 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1250 << Context.BuiltinInfo.GetName(BID); 1251 return 0; 1252 } 1253 1254 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1255 Diag(Loc, diag::ext_implicit_lib_function_decl) 1256 << Context.BuiltinInfo.GetName(BID) 1257 << R; 1258 if (Context.BuiltinInfo.getHeaderName(BID) && 1259 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1260 != Diagnostic::Ignored) 1261 Diag(Loc, diag::note_please_include_header) 1262 << Context.BuiltinInfo.getHeaderName(BID) 1263 << Context.BuiltinInfo.GetName(BID); 1264 } 1265 1266 FunctionDecl *New = FunctionDecl::Create(Context, 1267 Context.getTranslationUnitDecl(), 1268 Loc, Loc, II, R, /*TInfo=*/0, 1269 SC_Extern, 1270 SC_None, false, 1271 /*hasPrototype=*/true); 1272 New->setImplicit(); 1273 1274 // Create Decl objects for each parameter, adding them to the 1275 // FunctionDecl. 1276 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1277 SmallVector<ParmVarDecl*, 16> Params; 1278 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1279 ParmVarDecl *parm = 1280 ParmVarDecl::Create(Context, New, SourceLocation(), 1281 SourceLocation(), 0, 1282 FT->getArgType(i), /*TInfo=*/0, 1283 SC_None, SC_None, 0); 1284 parm->setScopeInfo(0, i); 1285 Params.push_back(parm); 1286 } 1287 New->setParams(Params.data(), Params.size()); 1288 } 1289 1290 AddKnownFunctionAttributes(New); 1291 1292 // TUScope is the translation-unit scope to insert this function into. 1293 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1294 // relate Scopes to DeclContexts, and probably eliminate CurContext 1295 // entirely, but we're not there yet. 1296 DeclContext *SavedContext = CurContext; 1297 CurContext = Context.getTranslationUnitDecl(); 1298 PushOnScopeChains(New, TUScope); 1299 CurContext = SavedContext; 1300 return New; 1301} 1302 1303/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1304/// same name and scope as a previous declaration 'Old'. Figure out 1305/// how to resolve this situation, merging decls or emitting 1306/// diagnostics as appropriate. If there was an error, set New to be invalid. 1307/// 1308void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1309 // If the new decl is known invalid already, don't bother doing any 1310 // merging checks. 1311 if (New->isInvalidDecl()) return; 1312 1313 // Allow multiple definitions for ObjC built-in typedefs. 1314 // FIXME: Verify the underlying types are equivalent! 1315 if (getLangOptions().ObjC1) { 1316 const IdentifierInfo *TypeID = New->getIdentifier(); 1317 switch (TypeID->getLength()) { 1318 default: break; 1319 case 2: 1320 if (!TypeID->isStr("id")) 1321 break; 1322 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1323 // Install the built-in type for 'id', ignoring the current definition. 1324 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1325 return; 1326 case 5: 1327 if (!TypeID->isStr("Class")) 1328 break; 1329 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1330 // Install the built-in type for 'Class', ignoring the current definition. 1331 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1332 return; 1333 case 3: 1334 if (!TypeID->isStr("SEL")) 1335 break; 1336 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1337 // Install the built-in type for 'SEL', ignoring the current definition. 1338 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1339 return; 1340 } 1341 // Fall through - the typedef name was not a builtin type. 1342 } 1343 1344 // Verify the old decl was also a type. 1345 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1346 if (!Old) { 1347 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1348 << New->getDeclName(); 1349 1350 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1351 if (OldD->getLocation().isValid()) 1352 Diag(OldD->getLocation(), diag::note_previous_definition); 1353 1354 return New->setInvalidDecl(); 1355 } 1356 1357 // If the old declaration is invalid, just give up here. 1358 if (Old->isInvalidDecl()) 1359 return New->setInvalidDecl(); 1360 1361 // Determine the "old" type we'll use for checking and diagnostics. 1362 QualType OldType; 1363 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1364 OldType = OldTypedef->getUnderlyingType(); 1365 else 1366 OldType = Context.getTypeDeclType(Old); 1367 1368 // If the typedef types are not identical, reject them in all languages and 1369 // with any extensions enabled. 1370 1371 if (OldType != New->getUnderlyingType() && 1372 Context.getCanonicalType(OldType) != 1373 Context.getCanonicalType(New->getUnderlyingType())) { 1374 int Kind = 0; 1375 if (isa<TypeAliasDecl>(Old)) 1376 Kind = 1; 1377 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1378 << Kind << New->getUnderlyingType() << OldType; 1379 if (Old->getLocation().isValid()) 1380 Diag(Old->getLocation(), diag::note_previous_definition); 1381 return New->setInvalidDecl(); 1382 } 1383 1384 // The types match. Link up the redeclaration chain if the old 1385 // declaration was a typedef. 1386 // FIXME: this is a potential source of weirdness if the type 1387 // spellings don't match exactly. 1388 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1389 New->setPreviousDeclaration(Typedef); 1390 1391 if (getLangOptions().Microsoft) 1392 return; 1393 1394 if (getLangOptions().CPlusPlus) { 1395 // C++ [dcl.typedef]p2: 1396 // In a given non-class scope, a typedef specifier can be used to 1397 // redefine the name of any type declared in that scope to refer 1398 // to the type to which it already refers. 1399 if (!isa<CXXRecordDecl>(CurContext)) 1400 return; 1401 1402 // C++0x [dcl.typedef]p4: 1403 // In a given class scope, a typedef specifier can be used to redefine 1404 // any class-name declared in that scope that is not also a typedef-name 1405 // to refer to the type to which it already refers. 1406 // 1407 // This wording came in via DR424, which was a correction to the 1408 // wording in DR56, which accidentally banned code like: 1409 // 1410 // struct S { 1411 // typedef struct A { } A; 1412 // }; 1413 // 1414 // in the C++03 standard. We implement the C++0x semantics, which 1415 // allow the above but disallow 1416 // 1417 // struct S { 1418 // typedef int I; 1419 // typedef int I; 1420 // }; 1421 // 1422 // since that was the intent of DR56. 1423 if (!isa<TypedefNameDecl>(Old)) 1424 return; 1425 1426 Diag(New->getLocation(), diag::err_redefinition) 1427 << New->getDeclName(); 1428 Diag(Old->getLocation(), diag::note_previous_definition); 1429 return New->setInvalidDecl(); 1430 } 1431 1432 // If we have a redefinition of a typedef in C, emit a warning. This warning 1433 // is normally mapped to an error, but can be controlled with 1434 // -Wtypedef-redefinition. If either the original or the redefinition is 1435 // in a system header, don't emit this for compatibility with GCC. 1436 if (getDiagnostics().getSuppressSystemWarnings() && 1437 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1438 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1439 return; 1440 1441 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1442 << New->getDeclName(); 1443 Diag(Old->getLocation(), diag::note_previous_definition); 1444 return; 1445} 1446 1447/// DeclhasAttr - returns true if decl Declaration already has the target 1448/// attribute. 1449static bool 1450DeclHasAttr(const Decl *D, const Attr *A) { 1451 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1452 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1453 if ((*i)->getKind() == A->getKind()) { 1454 // FIXME: Don't hardcode this check 1455 if (OA && isa<OwnershipAttr>(*i)) 1456 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1457 return true; 1458 } 1459 1460 return false; 1461} 1462 1463/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1464static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1465 ASTContext &C, bool mergeDeprecation = true) { 1466 if (!oldDecl->hasAttrs()) 1467 return; 1468 1469 bool foundAny = newDecl->hasAttrs(); 1470 1471 // Ensure that any moving of objects within the allocated map is done before 1472 // we process them. 1473 if (!foundAny) newDecl->setAttrs(AttrVec()); 1474 1475 for (specific_attr_iterator<InheritableAttr> 1476 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1477 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1478 // Ignore deprecated and unavailable attributes if requested. 1479 if (!mergeDeprecation && 1480 (isa<DeprecatedAttr>(*i) || isa<UnavailableAttr>(*i))) 1481 continue; 1482 1483 if (!DeclHasAttr(newDecl, *i)) { 1484 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1485 newAttr->setInherited(true); 1486 newDecl->addAttr(newAttr); 1487 foundAny = true; 1488 } 1489 } 1490 1491 if (!foundAny) newDecl->dropAttrs(); 1492} 1493 1494/// mergeParamDeclAttributes - Copy attributes from the old parameter 1495/// to the new one. 1496static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1497 const ParmVarDecl *oldDecl, 1498 ASTContext &C) { 1499 if (!oldDecl->hasAttrs()) 1500 return; 1501 1502 bool foundAny = newDecl->hasAttrs(); 1503 1504 // Ensure that any moving of objects within the allocated map is 1505 // done before we process them. 1506 if (!foundAny) newDecl->setAttrs(AttrVec()); 1507 1508 for (specific_attr_iterator<InheritableParamAttr> 1509 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1510 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1511 if (!DeclHasAttr(newDecl, *i)) { 1512 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1513 newAttr->setInherited(true); 1514 newDecl->addAttr(newAttr); 1515 foundAny = true; 1516 } 1517 } 1518 1519 if (!foundAny) newDecl->dropAttrs(); 1520} 1521 1522namespace { 1523 1524/// Used in MergeFunctionDecl to keep track of function parameters in 1525/// C. 1526struct GNUCompatibleParamWarning { 1527 ParmVarDecl *OldParm; 1528 ParmVarDecl *NewParm; 1529 QualType PromotedType; 1530}; 1531 1532} 1533 1534/// getSpecialMember - get the special member enum for a method. 1535Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1536 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1537 if (Ctor->isDefaultConstructor()) 1538 return Sema::CXXDefaultConstructor; 1539 1540 if (Ctor->isCopyConstructor()) 1541 return Sema::CXXCopyConstructor; 1542 1543 if (Ctor->isMoveConstructor()) 1544 return Sema::CXXMoveConstructor; 1545 } else if (isa<CXXDestructorDecl>(MD)) { 1546 return Sema::CXXDestructor; 1547 } else if (MD->isCopyAssignmentOperator()) { 1548 return Sema::CXXCopyAssignment; 1549 } 1550 1551 return Sema::CXXInvalid; 1552} 1553 1554/// canRedefineFunction - checks if a function can be redefined. Currently, 1555/// only extern inline functions can be redefined, and even then only in 1556/// GNU89 mode. 1557static bool canRedefineFunction(const FunctionDecl *FD, 1558 const LangOptions& LangOpts) { 1559 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1560 !LangOpts.CPlusPlus && 1561 FD->isInlineSpecified() && 1562 FD->getStorageClass() == SC_Extern); 1563} 1564 1565/// MergeFunctionDecl - We just parsed a function 'New' from 1566/// declarator D which has the same name and scope as a previous 1567/// declaration 'Old'. Figure out how to resolve this situation, 1568/// merging decls or emitting diagnostics as appropriate. 1569/// 1570/// In C++, New and Old must be declarations that are not 1571/// overloaded. Use IsOverload to determine whether New and Old are 1572/// overloaded, and to select the Old declaration that New should be 1573/// merged with. 1574/// 1575/// Returns true if there was an error, false otherwise. 1576bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1577 // Verify the old decl was also a function. 1578 FunctionDecl *Old = 0; 1579 if (FunctionTemplateDecl *OldFunctionTemplate 1580 = dyn_cast<FunctionTemplateDecl>(OldD)) 1581 Old = OldFunctionTemplate->getTemplatedDecl(); 1582 else 1583 Old = dyn_cast<FunctionDecl>(OldD); 1584 if (!Old) { 1585 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1586 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1587 Diag(Shadow->getTargetDecl()->getLocation(), 1588 diag::note_using_decl_target); 1589 Diag(Shadow->getUsingDecl()->getLocation(), 1590 diag::note_using_decl) << 0; 1591 return true; 1592 } 1593 1594 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1595 << New->getDeclName(); 1596 Diag(OldD->getLocation(), diag::note_previous_definition); 1597 return true; 1598 } 1599 1600 // Determine whether the previous declaration was a definition, 1601 // implicit declaration, or a declaration. 1602 diag::kind PrevDiag; 1603 if (Old->isThisDeclarationADefinition()) 1604 PrevDiag = diag::note_previous_definition; 1605 else if (Old->isImplicit()) 1606 PrevDiag = diag::note_previous_implicit_declaration; 1607 else 1608 PrevDiag = diag::note_previous_declaration; 1609 1610 QualType OldQType = Context.getCanonicalType(Old->getType()); 1611 QualType NewQType = Context.getCanonicalType(New->getType()); 1612 1613 // Don't complain about this if we're in GNU89 mode and the old function 1614 // is an extern inline function. 1615 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1616 New->getStorageClass() == SC_Static && 1617 Old->getStorageClass() != SC_Static && 1618 !canRedefineFunction(Old, getLangOptions())) { 1619 if (getLangOptions().Microsoft) { 1620 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1621 Diag(Old->getLocation(), PrevDiag); 1622 } else { 1623 Diag(New->getLocation(), diag::err_static_non_static) << New; 1624 Diag(Old->getLocation(), PrevDiag); 1625 return true; 1626 } 1627 } 1628 1629 // If a function is first declared with a calling convention, but is 1630 // later declared or defined without one, the second decl assumes the 1631 // calling convention of the first. 1632 // 1633 // For the new decl, we have to look at the NON-canonical type to tell the 1634 // difference between a function that really doesn't have a calling 1635 // convention and one that is declared cdecl. That's because in 1636 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1637 // because it is the default calling convention. 1638 // 1639 // Note also that we DO NOT return at this point, because we still have 1640 // other tests to run. 1641 const FunctionType *OldType = cast<FunctionType>(OldQType); 1642 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1643 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1644 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1645 bool RequiresAdjustment = false; 1646 if (OldTypeInfo.getCC() != CC_Default && 1647 NewTypeInfo.getCC() == CC_Default) { 1648 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1649 RequiresAdjustment = true; 1650 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1651 NewTypeInfo.getCC())) { 1652 // Calling conventions really aren't compatible, so complain. 1653 Diag(New->getLocation(), diag::err_cconv_change) 1654 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1655 << (OldTypeInfo.getCC() == CC_Default) 1656 << (OldTypeInfo.getCC() == CC_Default ? "" : 1657 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1658 Diag(Old->getLocation(), diag::note_previous_declaration); 1659 return true; 1660 } 1661 1662 // FIXME: diagnose the other way around? 1663 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1664 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1665 RequiresAdjustment = true; 1666 } 1667 1668 // Merge regparm attribute. 1669 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1670 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1671 if (NewTypeInfo.getHasRegParm()) { 1672 Diag(New->getLocation(), diag::err_regparm_mismatch) 1673 << NewType->getRegParmType() 1674 << OldType->getRegParmType(); 1675 Diag(Old->getLocation(), diag::note_previous_declaration); 1676 return true; 1677 } 1678 1679 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1680 RequiresAdjustment = true; 1681 } 1682 1683 if (RequiresAdjustment) { 1684 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1685 New->setType(QualType(NewType, 0)); 1686 NewQType = Context.getCanonicalType(New->getType()); 1687 } 1688 1689 if (getLangOptions().CPlusPlus) { 1690 // (C++98 13.1p2): 1691 // Certain function declarations cannot be overloaded: 1692 // -- Function declarations that differ only in the return type 1693 // cannot be overloaded. 1694 QualType OldReturnType = OldType->getResultType(); 1695 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1696 QualType ResQT; 1697 if (OldReturnType != NewReturnType) { 1698 if (NewReturnType->isObjCObjectPointerType() 1699 && OldReturnType->isObjCObjectPointerType()) 1700 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1701 if (ResQT.isNull()) { 1702 if (New->isCXXClassMember() && New->isOutOfLine()) 1703 Diag(New->getLocation(), 1704 diag::err_member_def_does_not_match_ret_type) << New; 1705 else 1706 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1707 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1708 return true; 1709 } 1710 else 1711 NewQType = ResQT; 1712 } 1713 1714 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1715 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1716 if (OldMethod && NewMethod) { 1717 // Preserve triviality. 1718 NewMethod->setTrivial(OldMethod->isTrivial()); 1719 1720 // MSVC allows explicit template specialization at class scope: 1721 // 2 CXMethodDecls referring to the same function will be injected. 1722 // We don't want a redeclartion error. 1723 bool IsClassScopeExplicitSpecialization = 1724 OldMethod->isFunctionTemplateSpecialization() && 1725 NewMethod->isFunctionTemplateSpecialization(); 1726 bool isFriend = NewMethod->getFriendObjectKind(); 1727 1728 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1729 !IsClassScopeExplicitSpecialization) { 1730 // -- Member function declarations with the same name and the 1731 // same parameter types cannot be overloaded if any of them 1732 // is a static member function declaration. 1733 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1734 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1735 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1736 return true; 1737 } 1738 1739 // C++ [class.mem]p1: 1740 // [...] A member shall not be declared twice in the 1741 // member-specification, except that a nested class or member 1742 // class template can be declared and then later defined. 1743 unsigned NewDiag; 1744 if (isa<CXXConstructorDecl>(OldMethod)) 1745 NewDiag = diag::err_constructor_redeclared; 1746 else if (isa<CXXDestructorDecl>(NewMethod)) 1747 NewDiag = diag::err_destructor_redeclared; 1748 else if (isa<CXXConversionDecl>(NewMethod)) 1749 NewDiag = diag::err_conv_function_redeclared; 1750 else 1751 NewDiag = diag::err_member_redeclared; 1752 1753 Diag(New->getLocation(), NewDiag); 1754 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1755 1756 // Complain if this is an explicit declaration of a special 1757 // member that was initially declared implicitly. 1758 // 1759 // As an exception, it's okay to befriend such methods in order 1760 // to permit the implicit constructor/destructor/operator calls. 1761 } else if (OldMethod->isImplicit()) { 1762 if (isFriend) { 1763 NewMethod->setImplicit(); 1764 } else { 1765 Diag(NewMethod->getLocation(), 1766 diag::err_definition_of_implicitly_declared_member) 1767 << New << getSpecialMember(OldMethod); 1768 return true; 1769 } 1770 } else if (OldMethod->isExplicitlyDefaulted()) { 1771 Diag(NewMethod->getLocation(), 1772 diag::err_definition_of_explicitly_defaulted_member) 1773 << getSpecialMember(OldMethod); 1774 return true; 1775 } 1776 } 1777 1778 // (C++98 8.3.5p3): 1779 // All declarations for a function shall agree exactly in both the 1780 // return type and the parameter-type-list. 1781 // We also want to respect all the extended bits except noreturn. 1782 1783 // noreturn should now match unless the old type info didn't have it. 1784 QualType OldQTypeForComparison = OldQType; 1785 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1786 assert(OldQType == QualType(OldType, 0)); 1787 const FunctionType *OldTypeForComparison 1788 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1789 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1790 assert(OldQTypeForComparison.isCanonical()); 1791 } 1792 1793 if (OldQTypeForComparison == NewQType) 1794 return MergeCompatibleFunctionDecls(New, Old); 1795 1796 // Fall through for conflicting redeclarations and redefinitions. 1797 } 1798 1799 // C: Function types need to be compatible, not identical. This handles 1800 // duplicate function decls like "void f(int); void f(enum X);" properly. 1801 if (!getLangOptions().CPlusPlus && 1802 Context.typesAreCompatible(OldQType, NewQType)) { 1803 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1804 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1805 const FunctionProtoType *OldProto = 0; 1806 if (isa<FunctionNoProtoType>(NewFuncType) && 1807 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1808 // The old declaration provided a function prototype, but the 1809 // new declaration does not. Merge in the prototype. 1810 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1811 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1812 OldProto->arg_type_end()); 1813 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1814 ParamTypes.data(), ParamTypes.size(), 1815 OldProto->getExtProtoInfo()); 1816 New->setType(NewQType); 1817 New->setHasInheritedPrototype(); 1818 1819 // Synthesize a parameter for each argument type. 1820 SmallVector<ParmVarDecl*, 16> Params; 1821 for (FunctionProtoType::arg_type_iterator 1822 ParamType = OldProto->arg_type_begin(), 1823 ParamEnd = OldProto->arg_type_end(); 1824 ParamType != ParamEnd; ++ParamType) { 1825 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1826 SourceLocation(), 1827 SourceLocation(), 0, 1828 *ParamType, /*TInfo=*/0, 1829 SC_None, SC_None, 1830 0); 1831 Param->setScopeInfo(0, Params.size()); 1832 Param->setImplicit(); 1833 Params.push_back(Param); 1834 } 1835 1836 New->setParams(Params.data(), Params.size()); 1837 } 1838 1839 return MergeCompatibleFunctionDecls(New, Old); 1840 } 1841 1842 // GNU C permits a K&R definition to follow a prototype declaration 1843 // if the declared types of the parameters in the K&R definition 1844 // match the types in the prototype declaration, even when the 1845 // promoted types of the parameters from the K&R definition differ 1846 // from the types in the prototype. GCC then keeps the types from 1847 // the prototype. 1848 // 1849 // If a variadic prototype is followed by a non-variadic K&R definition, 1850 // the K&R definition becomes variadic. This is sort of an edge case, but 1851 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1852 // C99 6.9.1p8. 1853 if (!getLangOptions().CPlusPlus && 1854 Old->hasPrototype() && !New->hasPrototype() && 1855 New->getType()->getAs<FunctionProtoType>() && 1856 Old->getNumParams() == New->getNumParams()) { 1857 SmallVector<QualType, 16> ArgTypes; 1858 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1859 const FunctionProtoType *OldProto 1860 = Old->getType()->getAs<FunctionProtoType>(); 1861 const FunctionProtoType *NewProto 1862 = New->getType()->getAs<FunctionProtoType>(); 1863 1864 // Determine whether this is the GNU C extension. 1865 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1866 NewProto->getResultType()); 1867 bool LooseCompatible = !MergedReturn.isNull(); 1868 for (unsigned Idx = 0, End = Old->getNumParams(); 1869 LooseCompatible && Idx != End; ++Idx) { 1870 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1871 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1872 if (Context.typesAreCompatible(OldParm->getType(), 1873 NewProto->getArgType(Idx))) { 1874 ArgTypes.push_back(NewParm->getType()); 1875 } else if (Context.typesAreCompatible(OldParm->getType(), 1876 NewParm->getType(), 1877 /*CompareUnqualified=*/true)) { 1878 GNUCompatibleParamWarning Warn 1879 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1880 Warnings.push_back(Warn); 1881 ArgTypes.push_back(NewParm->getType()); 1882 } else 1883 LooseCompatible = false; 1884 } 1885 1886 if (LooseCompatible) { 1887 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1888 Diag(Warnings[Warn].NewParm->getLocation(), 1889 diag::ext_param_promoted_not_compatible_with_prototype) 1890 << Warnings[Warn].PromotedType 1891 << Warnings[Warn].OldParm->getType(); 1892 if (Warnings[Warn].OldParm->getLocation().isValid()) 1893 Diag(Warnings[Warn].OldParm->getLocation(), 1894 diag::note_previous_declaration); 1895 } 1896 1897 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1898 ArgTypes.size(), 1899 OldProto->getExtProtoInfo())); 1900 return MergeCompatibleFunctionDecls(New, Old); 1901 } 1902 1903 // Fall through to diagnose conflicting types. 1904 } 1905 1906 // A function that has already been declared has been redeclared or defined 1907 // with a different type- show appropriate diagnostic 1908 if (unsigned BuiltinID = Old->getBuiltinID()) { 1909 // The user has declared a builtin function with an incompatible 1910 // signature. 1911 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1912 // The function the user is redeclaring is a library-defined 1913 // function like 'malloc' or 'printf'. Warn about the 1914 // redeclaration, then pretend that we don't know about this 1915 // library built-in. 1916 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1917 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1918 << Old << Old->getType(); 1919 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1920 Old->setInvalidDecl(); 1921 return false; 1922 } 1923 1924 PrevDiag = diag::note_previous_builtin_declaration; 1925 } 1926 1927 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1928 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1929 return true; 1930} 1931 1932/// \brief Completes the merge of two function declarations that are 1933/// known to be compatible. 1934/// 1935/// This routine handles the merging of attributes and other 1936/// properties of function declarations form the old declaration to 1937/// the new declaration, once we know that New is in fact a 1938/// redeclaration of Old. 1939/// 1940/// \returns false 1941bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1942 // Merge the attributes 1943 mergeDeclAttributes(New, Old, Context); 1944 1945 // Merge the storage class. 1946 if (Old->getStorageClass() != SC_Extern && 1947 Old->getStorageClass() != SC_None) 1948 New->setStorageClass(Old->getStorageClass()); 1949 1950 // Merge "pure" flag. 1951 if (Old->isPure()) 1952 New->setPure(); 1953 1954 // Merge attributes from the parameters. These can mismatch with K&R 1955 // declarations. 1956 if (New->getNumParams() == Old->getNumParams()) 1957 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 1958 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 1959 Context); 1960 1961 if (getLangOptions().CPlusPlus) 1962 return MergeCXXFunctionDecl(New, Old); 1963 1964 return false; 1965} 1966 1967 1968void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 1969 const ObjCMethodDecl *oldMethod) { 1970 // We don't want to merge unavailable and deprecated attributes 1971 // except from interface to implementation. 1972 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 1973 1974 // Merge the attributes. 1975 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation); 1976 1977 // Merge attributes from the parameters. 1978 for (ObjCMethodDecl::param_iterator oi = oldMethod->param_begin(), 1979 ni = newMethod->param_begin(), ne = newMethod->param_end(); 1980 ni != ne; ++ni, ++oi) 1981 mergeParamDeclAttributes(*ni, *oi, Context); 1982 1983 CheckObjCMethodOverride(newMethod, oldMethod, true); 1984} 1985 1986/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 1987/// scope as a previous declaration 'Old'. Figure out how to merge their types, 1988/// emitting diagnostics as appropriate. 1989/// 1990/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 1991/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 1992/// check them before the initializer is attached. 1993/// 1994void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 1995 if (New->isInvalidDecl() || Old->isInvalidDecl()) 1996 return; 1997 1998 QualType MergedT; 1999 if (getLangOptions().CPlusPlus) { 2000 AutoType *AT = New->getType()->getContainedAutoType(); 2001 if (AT && !AT->isDeduced()) { 2002 // We don't know what the new type is until the initializer is attached. 2003 return; 2004 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2005 // These could still be something that needs exception specs checked. 2006 return MergeVarDeclExceptionSpecs(New, Old); 2007 } 2008 // C++ [basic.link]p10: 2009 // [...] the types specified by all declarations referring to a given 2010 // object or function shall be identical, except that declarations for an 2011 // array object can specify array types that differ by the presence or 2012 // absence of a major array bound (8.3.4). 2013 else if (Old->getType()->isIncompleteArrayType() && 2014 New->getType()->isArrayType()) { 2015 CanQual<ArrayType> OldArray 2016 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2017 CanQual<ArrayType> NewArray 2018 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2019 if (OldArray->getElementType() == NewArray->getElementType()) 2020 MergedT = New->getType(); 2021 } else if (Old->getType()->isArrayType() && 2022 New->getType()->isIncompleteArrayType()) { 2023 CanQual<ArrayType> OldArray 2024 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2025 CanQual<ArrayType> NewArray 2026 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2027 if (OldArray->getElementType() == NewArray->getElementType()) 2028 MergedT = Old->getType(); 2029 } else if (New->getType()->isObjCObjectPointerType() 2030 && Old->getType()->isObjCObjectPointerType()) { 2031 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2032 Old->getType()); 2033 } 2034 } else { 2035 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2036 } 2037 if (MergedT.isNull()) { 2038 Diag(New->getLocation(), diag::err_redefinition_different_type) 2039 << New->getDeclName(); 2040 Diag(Old->getLocation(), diag::note_previous_definition); 2041 return New->setInvalidDecl(); 2042 } 2043 New->setType(MergedT); 2044} 2045 2046/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2047/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2048/// situation, merging decls or emitting diagnostics as appropriate. 2049/// 2050/// Tentative definition rules (C99 6.9.2p2) are checked by 2051/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2052/// definitions here, since the initializer hasn't been attached. 2053/// 2054void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2055 // If the new decl is already invalid, don't do any other checking. 2056 if (New->isInvalidDecl()) 2057 return; 2058 2059 // Verify the old decl was also a variable. 2060 VarDecl *Old = 0; 2061 if (!Previous.isSingleResult() || 2062 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2063 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2064 << New->getDeclName(); 2065 Diag(Previous.getRepresentativeDecl()->getLocation(), 2066 diag::note_previous_definition); 2067 return New->setInvalidDecl(); 2068 } 2069 2070 // C++ [class.mem]p1: 2071 // A member shall not be declared twice in the member-specification [...] 2072 // 2073 // Here, we need only consider static data members. 2074 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2075 Diag(New->getLocation(), diag::err_duplicate_member) 2076 << New->getIdentifier(); 2077 Diag(Old->getLocation(), diag::note_previous_declaration); 2078 New->setInvalidDecl(); 2079 } 2080 2081 mergeDeclAttributes(New, Old, Context); 2082 // Warn if an already-declared variable is made a weak_import in a subsequent declaration 2083 if (New->getAttr<WeakImportAttr>() && 2084 Old->getStorageClass() == SC_None && 2085 !Old->getAttr<WeakImportAttr>()) { 2086 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2087 Diag(Old->getLocation(), diag::note_previous_definition); 2088 // Remove weak_import attribute on new declaration. 2089 New->dropAttr<WeakImportAttr>(); 2090 } 2091 2092 // Merge the types. 2093 MergeVarDeclTypes(New, Old); 2094 if (New->isInvalidDecl()) 2095 return; 2096 2097 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2098 if (New->getStorageClass() == SC_Static && 2099 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2100 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2101 Diag(Old->getLocation(), diag::note_previous_definition); 2102 return New->setInvalidDecl(); 2103 } 2104 // C99 6.2.2p4: 2105 // For an identifier declared with the storage-class specifier 2106 // extern in a scope in which a prior declaration of that 2107 // identifier is visible,23) if the prior declaration specifies 2108 // internal or external linkage, the linkage of the identifier at 2109 // the later declaration is the same as the linkage specified at 2110 // the prior declaration. If no prior declaration is visible, or 2111 // if the prior declaration specifies no linkage, then the 2112 // identifier has external linkage. 2113 if (New->hasExternalStorage() && Old->hasLinkage()) 2114 /* Okay */; 2115 else if (New->getStorageClass() != SC_Static && 2116 Old->getStorageClass() == SC_Static) { 2117 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2118 Diag(Old->getLocation(), diag::note_previous_definition); 2119 return New->setInvalidDecl(); 2120 } 2121 2122 // Check if extern is followed by non-extern and vice-versa. 2123 if (New->hasExternalStorage() && 2124 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2125 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2126 Diag(Old->getLocation(), diag::note_previous_definition); 2127 return New->setInvalidDecl(); 2128 } 2129 if (Old->hasExternalStorage() && 2130 !New->hasLinkage() && New->isLocalVarDecl()) { 2131 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2132 Diag(Old->getLocation(), diag::note_previous_definition); 2133 return New->setInvalidDecl(); 2134 } 2135 2136 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2137 2138 // FIXME: The test for external storage here seems wrong? We still 2139 // need to check for mismatches. 2140 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2141 // Don't complain about out-of-line definitions of static members. 2142 !(Old->getLexicalDeclContext()->isRecord() && 2143 !New->getLexicalDeclContext()->isRecord())) { 2144 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2145 Diag(Old->getLocation(), diag::note_previous_definition); 2146 return New->setInvalidDecl(); 2147 } 2148 2149 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2150 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2151 Diag(Old->getLocation(), diag::note_previous_definition); 2152 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2153 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2154 Diag(Old->getLocation(), diag::note_previous_definition); 2155 } 2156 2157 // C++ doesn't have tentative definitions, so go right ahead and check here. 2158 const VarDecl *Def; 2159 if (getLangOptions().CPlusPlus && 2160 New->isThisDeclarationADefinition() == VarDecl::Definition && 2161 (Def = Old->getDefinition())) { 2162 Diag(New->getLocation(), diag::err_redefinition) 2163 << New->getDeclName(); 2164 Diag(Def->getLocation(), diag::note_previous_definition); 2165 New->setInvalidDecl(); 2166 return; 2167 } 2168 // c99 6.2.2 P4. 2169 // For an identifier declared with the storage-class specifier extern in a 2170 // scope in which a prior declaration of that identifier is visible, if 2171 // the prior declaration specifies internal or external linkage, the linkage 2172 // of the identifier at the later declaration is the same as the linkage 2173 // specified at the prior declaration. 2174 // FIXME. revisit this code. 2175 if (New->hasExternalStorage() && 2176 Old->getLinkage() == InternalLinkage && 2177 New->getDeclContext() == Old->getDeclContext()) 2178 New->setStorageClass(Old->getStorageClass()); 2179 2180 // Keep a chain of previous declarations. 2181 New->setPreviousDeclaration(Old); 2182 2183 // Inherit access appropriately. 2184 New->setAccess(Old->getAccess()); 2185} 2186 2187/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2188/// no declarator (e.g. "struct foo;") is parsed. 2189Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2190 DeclSpec &DS) { 2191 return ParsedFreeStandingDeclSpec(S, AS, DS, 2192 MultiTemplateParamsArg(*this, 0, 0)); 2193} 2194 2195/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2196/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2197/// parameters to cope with template friend declarations. 2198Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2199 DeclSpec &DS, 2200 MultiTemplateParamsArg TemplateParams) { 2201 Decl *TagD = 0; 2202 TagDecl *Tag = 0; 2203 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2204 DS.getTypeSpecType() == DeclSpec::TST_struct || 2205 DS.getTypeSpecType() == DeclSpec::TST_union || 2206 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2207 TagD = DS.getRepAsDecl(); 2208 2209 if (!TagD) // We probably had an error 2210 return 0; 2211 2212 // Note that the above type specs guarantee that the 2213 // type rep is a Decl, whereas in many of the others 2214 // it's a Type. 2215 Tag = dyn_cast<TagDecl>(TagD); 2216 } 2217 2218 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2219 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2220 // or incomplete types shall not be restrict-qualified." 2221 if (TypeQuals & DeclSpec::TQ_restrict) 2222 Diag(DS.getRestrictSpecLoc(), 2223 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2224 << DS.getSourceRange(); 2225 } 2226 2227 if (DS.isConstexprSpecified()) { 2228 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2229 // and definitions of functions and variables. 2230 if (Tag) 2231 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2232 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2233 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2234 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2235 else 2236 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2237 // Don't emit warnings after this error. 2238 return TagD; 2239 } 2240 2241 if (DS.isFriendSpecified()) { 2242 // If we're dealing with a decl but not a TagDecl, assume that 2243 // whatever routines created it handled the friendship aspect. 2244 if (TagD && !Tag) 2245 return 0; 2246 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2247 } 2248 2249 // Track whether we warned about the fact that there aren't any 2250 // declarators. 2251 bool emittedWarning = false; 2252 2253 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2254 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2255 2256 if (!Record->getDeclName() && Record->isDefinition() && 2257 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2258 if (getLangOptions().CPlusPlus || 2259 Record->getDeclContext()->isRecord()) 2260 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2261 2262 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2263 << DS.getSourceRange(); 2264 emittedWarning = true; 2265 } 2266 } 2267 2268 // Check for Microsoft C extension: anonymous struct. 2269 if (getLangOptions().Microsoft && !getLangOptions().CPlusPlus && 2270 CurContext->isRecord() && 2271 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2272 // Handle 2 kinds of anonymous struct: 2273 // struct STRUCT; 2274 // and 2275 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2276 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2277 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 2278 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2279 DS.getRepAsType().get()->isStructureType())) { 2280 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2281 << DS.getSourceRange(); 2282 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2283 } 2284 } 2285 2286 if (getLangOptions().CPlusPlus && 2287 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2288 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2289 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2290 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2291 Diag(Enum->getLocation(), diag::ext_no_declarators) 2292 << DS.getSourceRange(); 2293 emittedWarning = true; 2294 } 2295 2296 // Skip all the checks below if we have a type error. 2297 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2298 2299 if (!DS.isMissingDeclaratorOk()) { 2300 // Warn about typedefs of enums without names, since this is an 2301 // extension in both Microsoft and GNU. 2302 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2303 Tag && isa<EnumDecl>(Tag)) { 2304 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2305 << DS.getSourceRange(); 2306 return Tag; 2307 } 2308 2309 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2310 << DS.getSourceRange(); 2311 emittedWarning = true; 2312 } 2313 2314 // We're going to complain about a bunch of spurious specifiers; 2315 // only do this if we're declaring a tag, because otherwise we 2316 // should be getting diag::ext_no_declarators. 2317 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2318 return TagD; 2319 2320 // Note that a linkage-specification sets a storage class, but 2321 // 'extern "C" struct foo;' is actually valid and not theoretically 2322 // useless. 2323 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2324 if (!DS.isExternInLinkageSpec()) 2325 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2326 << DeclSpec::getSpecifierName(scs); 2327 2328 if (DS.isThreadSpecified()) 2329 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2330 if (DS.getTypeQualifiers()) { 2331 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2332 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2333 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2334 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2335 // Restrict is covered above. 2336 } 2337 if (DS.isInlineSpecified()) 2338 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2339 if (DS.isVirtualSpecified()) 2340 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2341 if (DS.isExplicitSpecified()) 2342 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2343 2344 // FIXME: Warn on useless attributes 2345 2346 return TagD; 2347} 2348 2349/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2350/// builds a statement for it and returns it so it is evaluated. 2351StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2352 StmtResult R; 2353 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2354 Expr *Exp = DS.getRepAsExpr(); 2355 QualType Ty = Exp->getType(); 2356 if (Ty->isPointerType()) { 2357 do 2358 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2359 while (Ty->isPointerType()); 2360 } 2361 if (Ty->isVariableArrayType()) { 2362 R = ActOnExprStmt(MakeFullExpr(Exp)); 2363 } 2364 } 2365 return R; 2366} 2367 2368/// We are trying to inject an anonymous member into the given scope; 2369/// check if there's an existing declaration that can't be overloaded. 2370/// 2371/// \return true if this is a forbidden redeclaration 2372static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2373 Scope *S, 2374 DeclContext *Owner, 2375 DeclarationName Name, 2376 SourceLocation NameLoc, 2377 unsigned diagnostic) { 2378 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2379 Sema::ForRedeclaration); 2380 if (!SemaRef.LookupName(R, S)) return false; 2381 2382 if (R.getAsSingle<TagDecl>()) 2383 return false; 2384 2385 // Pick a representative declaration. 2386 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2387 assert(PrevDecl && "Expected a non-null Decl"); 2388 2389 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2390 return false; 2391 2392 SemaRef.Diag(NameLoc, diagnostic) << Name; 2393 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2394 2395 return true; 2396} 2397 2398/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2399/// anonymous struct or union AnonRecord into the owning context Owner 2400/// and scope S. This routine will be invoked just after we realize 2401/// that an unnamed union or struct is actually an anonymous union or 2402/// struct, e.g., 2403/// 2404/// @code 2405/// union { 2406/// int i; 2407/// float f; 2408/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2409/// // f into the surrounding scope.x 2410/// @endcode 2411/// 2412/// This routine is recursive, injecting the names of nested anonymous 2413/// structs/unions into the owning context and scope as well. 2414static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2415 DeclContext *Owner, 2416 RecordDecl *AnonRecord, 2417 AccessSpecifier AS, 2418 SmallVector<NamedDecl*, 2> &Chaining, 2419 bool MSAnonStruct) { 2420 unsigned diagKind 2421 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2422 : diag::err_anonymous_struct_member_redecl; 2423 2424 bool Invalid = false; 2425 2426 // Look every FieldDecl and IndirectFieldDecl with a name. 2427 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2428 DEnd = AnonRecord->decls_end(); 2429 D != DEnd; ++D) { 2430 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2431 cast<NamedDecl>(*D)->getDeclName()) { 2432 ValueDecl *VD = cast<ValueDecl>(*D); 2433 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2434 VD->getLocation(), diagKind)) { 2435 // C++ [class.union]p2: 2436 // The names of the members of an anonymous union shall be 2437 // distinct from the names of any other entity in the 2438 // scope in which the anonymous union is declared. 2439 Invalid = true; 2440 } else { 2441 // C++ [class.union]p2: 2442 // For the purpose of name lookup, after the anonymous union 2443 // definition, the members of the anonymous union are 2444 // considered to have been defined in the scope in which the 2445 // anonymous union is declared. 2446 unsigned OldChainingSize = Chaining.size(); 2447 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2448 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2449 PE = IF->chain_end(); PI != PE; ++PI) 2450 Chaining.push_back(*PI); 2451 else 2452 Chaining.push_back(VD); 2453 2454 assert(Chaining.size() >= 2); 2455 NamedDecl **NamedChain = 2456 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2457 for (unsigned i = 0; i < Chaining.size(); i++) 2458 NamedChain[i] = Chaining[i]; 2459 2460 IndirectFieldDecl* IndirectField = 2461 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2462 VD->getIdentifier(), VD->getType(), 2463 NamedChain, Chaining.size()); 2464 2465 IndirectField->setAccess(AS); 2466 IndirectField->setImplicit(); 2467 SemaRef.PushOnScopeChains(IndirectField, S); 2468 2469 // That includes picking up the appropriate access specifier. 2470 if (AS != AS_none) IndirectField->setAccess(AS); 2471 2472 Chaining.resize(OldChainingSize); 2473 } 2474 } 2475 } 2476 2477 return Invalid; 2478} 2479 2480/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2481/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2482/// illegal input values are mapped to SC_None. 2483static StorageClass 2484StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2485 switch (StorageClassSpec) { 2486 case DeclSpec::SCS_unspecified: return SC_None; 2487 case DeclSpec::SCS_extern: return SC_Extern; 2488 case DeclSpec::SCS_static: return SC_Static; 2489 case DeclSpec::SCS_auto: return SC_Auto; 2490 case DeclSpec::SCS_register: return SC_Register; 2491 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2492 // Illegal SCSs map to None: error reporting is up to the caller. 2493 case DeclSpec::SCS_mutable: // Fall through. 2494 case DeclSpec::SCS_typedef: return SC_None; 2495 } 2496 llvm_unreachable("unknown storage class specifier"); 2497} 2498 2499/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2500/// a StorageClass. Any error reporting is up to the caller: 2501/// illegal input values are mapped to SC_None. 2502static StorageClass 2503StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2504 switch (StorageClassSpec) { 2505 case DeclSpec::SCS_unspecified: return SC_None; 2506 case DeclSpec::SCS_extern: return SC_Extern; 2507 case DeclSpec::SCS_static: return SC_Static; 2508 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2509 // Illegal SCSs map to None: error reporting is up to the caller. 2510 case DeclSpec::SCS_auto: // Fall through. 2511 case DeclSpec::SCS_mutable: // Fall through. 2512 case DeclSpec::SCS_register: // Fall through. 2513 case DeclSpec::SCS_typedef: return SC_None; 2514 } 2515 llvm_unreachable("unknown storage class specifier"); 2516} 2517 2518/// BuildAnonymousStructOrUnion - Handle the declaration of an 2519/// anonymous structure or union. Anonymous unions are a C++ feature 2520/// (C++ [class.union]) and a GNU C extension; anonymous structures 2521/// are a GNU C and GNU C++ extension. 2522Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2523 AccessSpecifier AS, 2524 RecordDecl *Record) { 2525 DeclContext *Owner = Record->getDeclContext(); 2526 2527 // Diagnose whether this anonymous struct/union is an extension. 2528 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2529 Diag(Record->getLocation(), diag::ext_anonymous_union); 2530 else if (!Record->isUnion()) 2531 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2532 2533 // C and C++ require different kinds of checks for anonymous 2534 // structs/unions. 2535 bool Invalid = false; 2536 if (getLangOptions().CPlusPlus) { 2537 const char* PrevSpec = 0; 2538 unsigned DiagID; 2539 // C++ [class.union]p3: 2540 // Anonymous unions declared in a named namespace or in the 2541 // global namespace shall be declared static. 2542 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2543 (isa<TranslationUnitDecl>(Owner) || 2544 (isa<NamespaceDecl>(Owner) && 2545 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2546 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2547 Invalid = true; 2548 2549 // Recover by adding 'static'. 2550 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 2551 PrevSpec, DiagID, getLangOptions()); 2552 } 2553 // C++ [class.union]p3: 2554 // A storage class is not allowed in a declaration of an 2555 // anonymous union in a class scope. 2556 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2557 isa<RecordDecl>(Owner)) { 2558 Diag(DS.getStorageClassSpecLoc(), 2559 diag::err_anonymous_union_with_storage_spec); 2560 Invalid = true; 2561 2562 // Recover by removing the storage specifier. 2563 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 2564 PrevSpec, DiagID, getLangOptions()); 2565 } 2566 2567 // Ignore const/volatile/restrict qualifiers. 2568 if (DS.getTypeQualifiers()) { 2569 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2570 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2571 << Record->isUnion() << 0 2572 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2573 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2574 Diag(DS.getVolatileSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2575 << Record->isUnion() << 1 2576 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2577 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2578 Diag(DS.getRestrictSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2579 << Record->isUnion() << 2 2580 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2581 2582 DS.ClearTypeQualifiers(); 2583 } 2584 2585 // C++ [class.union]p2: 2586 // The member-specification of an anonymous union shall only 2587 // define non-static data members. [Note: nested types and 2588 // functions cannot be declared within an anonymous union. ] 2589 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2590 MemEnd = Record->decls_end(); 2591 Mem != MemEnd; ++Mem) { 2592 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2593 // C++ [class.union]p3: 2594 // An anonymous union shall not have private or protected 2595 // members (clause 11). 2596 assert(FD->getAccess() != AS_none); 2597 if (FD->getAccess() != AS_public) { 2598 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2599 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2600 Invalid = true; 2601 } 2602 2603 // C++ [class.union]p1 2604 // An object of a class with a non-trivial constructor, a non-trivial 2605 // copy constructor, a non-trivial destructor, or a non-trivial copy 2606 // assignment operator cannot be a member of a union, nor can an 2607 // array of such objects. 2608 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(FD)) 2609 Invalid = true; 2610 } else if ((*Mem)->isImplicit()) { 2611 // Any implicit members are fine. 2612 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2613 // This is a type that showed up in an 2614 // elaborated-type-specifier inside the anonymous struct or 2615 // union, but which actually declares a type outside of the 2616 // anonymous struct or union. It's okay. 2617 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2618 if (!MemRecord->isAnonymousStructOrUnion() && 2619 MemRecord->getDeclName()) { 2620 // Visual C++ allows type definition in anonymous struct or union. 2621 if (getLangOptions().Microsoft) 2622 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2623 << (int)Record->isUnion(); 2624 else { 2625 // This is a nested type declaration. 2626 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2627 << (int)Record->isUnion(); 2628 Invalid = true; 2629 } 2630 } 2631 } else if (isa<AccessSpecDecl>(*Mem)) { 2632 // Any access specifier is fine. 2633 } else { 2634 // We have something that isn't a non-static data 2635 // member. Complain about it. 2636 unsigned DK = diag::err_anonymous_record_bad_member; 2637 if (isa<TypeDecl>(*Mem)) 2638 DK = diag::err_anonymous_record_with_type; 2639 else if (isa<FunctionDecl>(*Mem)) 2640 DK = diag::err_anonymous_record_with_function; 2641 else if (isa<VarDecl>(*Mem)) 2642 DK = diag::err_anonymous_record_with_static; 2643 2644 // Visual C++ allows type definition in anonymous struct or union. 2645 if (getLangOptions().Microsoft && 2646 DK == diag::err_anonymous_record_with_type) 2647 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2648 << (int)Record->isUnion(); 2649 else { 2650 Diag((*Mem)->getLocation(), DK) 2651 << (int)Record->isUnion(); 2652 Invalid = true; 2653 } 2654 } 2655 } 2656 } 2657 2658 if (!Record->isUnion() && !Owner->isRecord()) { 2659 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2660 << (int)getLangOptions().CPlusPlus; 2661 Invalid = true; 2662 } 2663 2664 // Mock up a declarator. 2665 Declarator Dc(DS, Declarator::MemberContext); 2666 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2667 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2668 2669 // Create a declaration for this anonymous struct/union. 2670 NamedDecl *Anon = 0; 2671 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2672 Anon = FieldDecl::Create(Context, OwningClass, 2673 DS.getSourceRange().getBegin(), 2674 Record->getLocation(), 2675 /*IdentifierInfo=*/0, 2676 Context.getTypeDeclType(Record), 2677 TInfo, 2678 /*BitWidth=*/0, /*Mutable=*/false, 2679 /*HasInit=*/false); 2680 Anon->setAccess(AS); 2681 if (getLangOptions().CPlusPlus) 2682 FieldCollector->Add(cast<FieldDecl>(Anon)); 2683 } else { 2684 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2685 assert(SCSpec != DeclSpec::SCS_typedef && 2686 "Parser allowed 'typedef' as storage class VarDecl."); 2687 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2688 if (SCSpec == DeclSpec::SCS_mutable) { 2689 // mutable can only appear on non-static class members, so it's always 2690 // an error here 2691 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2692 Invalid = true; 2693 SC = SC_None; 2694 } 2695 SCSpec = DS.getStorageClassSpecAsWritten(); 2696 VarDecl::StorageClass SCAsWritten 2697 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2698 2699 Anon = VarDecl::Create(Context, Owner, 2700 DS.getSourceRange().getBegin(), 2701 Record->getLocation(), /*IdentifierInfo=*/0, 2702 Context.getTypeDeclType(Record), 2703 TInfo, SC, SCAsWritten); 2704 } 2705 Anon->setImplicit(); 2706 2707 // Add the anonymous struct/union object to the current 2708 // context. We'll be referencing this object when we refer to one of 2709 // its members. 2710 Owner->addDecl(Anon); 2711 2712 // Inject the members of the anonymous struct/union into the owning 2713 // context and into the identifier resolver chain for name lookup 2714 // purposes. 2715 SmallVector<NamedDecl*, 2> Chain; 2716 Chain.push_back(Anon); 2717 2718 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2719 Chain, false)) 2720 Invalid = true; 2721 2722 // Mark this as an anonymous struct/union type. Note that we do not 2723 // do this until after we have already checked and injected the 2724 // members of this anonymous struct/union type, because otherwise 2725 // the members could be injected twice: once by DeclContext when it 2726 // builds its lookup table, and once by 2727 // InjectAnonymousStructOrUnionMembers. 2728 Record->setAnonymousStructOrUnion(true); 2729 2730 if (Invalid) 2731 Anon->setInvalidDecl(); 2732 2733 return Anon; 2734} 2735 2736/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2737/// Microsoft C anonymous structure. 2738/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2739/// Example: 2740/// 2741/// struct A { int a; }; 2742/// struct B { struct A; int b; }; 2743/// 2744/// void foo() { 2745/// B var; 2746/// var.a = 3; 2747/// } 2748/// 2749Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2750 RecordDecl *Record) { 2751 2752 // If there is no Record, get the record via the typedef. 2753 if (!Record) 2754 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2755 2756 // Mock up a declarator. 2757 Declarator Dc(DS, Declarator::TypeNameContext); 2758 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2759 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2760 2761 // Create a declaration for this anonymous struct. 2762 NamedDecl* Anon = FieldDecl::Create(Context, 2763 cast<RecordDecl>(CurContext), 2764 DS.getSourceRange().getBegin(), 2765 DS.getSourceRange().getBegin(), 2766 /*IdentifierInfo=*/0, 2767 Context.getTypeDeclType(Record), 2768 TInfo, 2769 /*BitWidth=*/0, /*Mutable=*/false, 2770 /*HasInit=*/false); 2771 Anon->setImplicit(); 2772 2773 // Add the anonymous struct object to the current context. 2774 CurContext->addDecl(Anon); 2775 2776 // Inject the members of the anonymous struct into the current 2777 // context and into the identifier resolver chain for name lookup 2778 // purposes. 2779 SmallVector<NamedDecl*, 2> Chain; 2780 Chain.push_back(Anon); 2781 2782 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2783 Record->getDefinition(), 2784 AS_none, Chain, true)) 2785 Anon->setInvalidDecl(); 2786 2787 return Anon; 2788} 2789 2790/// GetNameForDeclarator - Determine the full declaration name for the 2791/// given Declarator. 2792DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2793 return GetNameFromUnqualifiedId(D.getName()); 2794} 2795 2796/// \brief Retrieves the declaration name from a parsed unqualified-id. 2797DeclarationNameInfo 2798Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2799 DeclarationNameInfo NameInfo; 2800 NameInfo.setLoc(Name.StartLocation); 2801 2802 switch (Name.getKind()) { 2803 2804 case UnqualifiedId::IK_ImplicitSelfParam: 2805 case UnqualifiedId::IK_Identifier: 2806 NameInfo.setName(Name.Identifier); 2807 NameInfo.setLoc(Name.StartLocation); 2808 return NameInfo; 2809 2810 case UnqualifiedId::IK_OperatorFunctionId: 2811 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2812 Name.OperatorFunctionId.Operator)); 2813 NameInfo.setLoc(Name.StartLocation); 2814 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2815 = Name.OperatorFunctionId.SymbolLocations[0]; 2816 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2817 = Name.EndLocation.getRawEncoding(); 2818 return NameInfo; 2819 2820 case UnqualifiedId::IK_LiteralOperatorId: 2821 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2822 Name.Identifier)); 2823 NameInfo.setLoc(Name.StartLocation); 2824 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2825 return NameInfo; 2826 2827 case UnqualifiedId::IK_ConversionFunctionId: { 2828 TypeSourceInfo *TInfo; 2829 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2830 if (Ty.isNull()) 2831 return DeclarationNameInfo(); 2832 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2833 Context.getCanonicalType(Ty))); 2834 NameInfo.setLoc(Name.StartLocation); 2835 NameInfo.setNamedTypeInfo(TInfo); 2836 return NameInfo; 2837 } 2838 2839 case UnqualifiedId::IK_ConstructorName: { 2840 TypeSourceInfo *TInfo; 2841 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2842 if (Ty.isNull()) 2843 return DeclarationNameInfo(); 2844 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2845 Context.getCanonicalType(Ty))); 2846 NameInfo.setLoc(Name.StartLocation); 2847 NameInfo.setNamedTypeInfo(TInfo); 2848 return NameInfo; 2849 } 2850 2851 case UnqualifiedId::IK_ConstructorTemplateId: { 2852 // In well-formed code, we can only have a constructor 2853 // template-id that refers to the current context, so go there 2854 // to find the actual type being constructed. 2855 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2856 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2857 return DeclarationNameInfo(); 2858 2859 // Determine the type of the class being constructed. 2860 QualType CurClassType = Context.getTypeDeclType(CurClass); 2861 2862 // FIXME: Check two things: that the template-id names the same type as 2863 // CurClassType, and that the template-id does not occur when the name 2864 // was qualified. 2865 2866 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2867 Context.getCanonicalType(CurClassType))); 2868 NameInfo.setLoc(Name.StartLocation); 2869 // FIXME: should we retrieve TypeSourceInfo? 2870 NameInfo.setNamedTypeInfo(0); 2871 return NameInfo; 2872 } 2873 2874 case UnqualifiedId::IK_DestructorName: { 2875 TypeSourceInfo *TInfo; 2876 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2877 if (Ty.isNull()) 2878 return DeclarationNameInfo(); 2879 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2880 Context.getCanonicalType(Ty))); 2881 NameInfo.setLoc(Name.StartLocation); 2882 NameInfo.setNamedTypeInfo(TInfo); 2883 return NameInfo; 2884 } 2885 2886 case UnqualifiedId::IK_TemplateId: { 2887 TemplateName TName = Name.TemplateId->Template.get(); 2888 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2889 return Context.getNameForTemplate(TName, TNameLoc); 2890 } 2891 2892 } // switch (Name.getKind()) 2893 2894 assert(false && "Unknown name kind"); 2895 return DeclarationNameInfo(); 2896} 2897 2898static QualType getCoreType(QualType Ty) { 2899 do { 2900 if (Ty->isPointerType() || Ty->isReferenceType()) 2901 Ty = Ty->getPointeeType(); 2902 else if (Ty->isArrayType()) 2903 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 2904 else 2905 return Ty.withoutLocalFastQualifiers(); 2906 } while (true); 2907} 2908 2909/// isNearlyMatchingFunction - Determine whether the C++ functions 2910/// Declaration and Definition are "nearly" matching. This heuristic 2911/// is used to improve diagnostics in the case where an out-of-line 2912/// function definition doesn't match any declaration within the class 2913/// or namespace. Also sets Params to the list of indices to the 2914/// parameters that differ between the declaration and the definition. 2915static bool isNearlyMatchingFunction(ASTContext &Context, 2916 FunctionDecl *Declaration, 2917 FunctionDecl *Definition, 2918 llvm::SmallVectorImpl<unsigned> &Params) { 2919 Params.clear(); 2920 if (Declaration->param_size() != Definition->param_size()) 2921 return false; 2922 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2923 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2924 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2925 2926 // The parameter types are identical 2927 if (DefParamTy == DeclParamTy) 2928 continue; 2929 2930 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 2931 QualType DefParamBaseTy = getCoreType(DefParamTy); 2932 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 2933 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 2934 2935 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 2936 (DeclTyName && DeclTyName == DefTyName)) 2937 Params.push_back(Idx); 2938 else // The two parameters aren't even close 2939 return false; 2940 } 2941 2942 return true; 2943} 2944 2945/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2946/// declarator needs to be rebuilt in the current instantiation. 2947/// Any bits of declarator which appear before the name are valid for 2948/// consideration here. That's specifically the type in the decl spec 2949/// and the base type in any member-pointer chunks. 2950static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2951 DeclarationName Name) { 2952 // The types we specifically need to rebuild are: 2953 // - typenames, typeofs, and decltypes 2954 // - types which will become injected class names 2955 // Of course, we also need to rebuild any type referencing such a 2956 // type. It's safest to just say "dependent", but we call out a 2957 // few cases here. 2958 2959 DeclSpec &DS = D.getMutableDeclSpec(); 2960 switch (DS.getTypeSpecType()) { 2961 case DeclSpec::TST_typename: 2962 case DeclSpec::TST_typeofType: 2963 case DeclSpec::TST_decltype: 2964 case DeclSpec::TST_underlyingType: { 2965 // Grab the type from the parser. 2966 TypeSourceInfo *TSI = 0; 2967 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2968 if (T.isNull() || !T->isDependentType()) break; 2969 2970 // Make sure there's a type source info. This isn't really much 2971 // of a waste; most dependent types should have type source info 2972 // attached already. 2973 if (!TSI) 2974 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2975 2976 // Rebuild the type in the current instantiation. 2977 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2978 if (!TSI) return true; 2979 2980 // Store the new type back in the decl spec. 2981 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2982 DS.UpdateTypeRep(LocType); 2983 break; 2984 } 2985 2986 case DeclSpec::TST_typeofExpr: { 2987 Expr *E = DS.getRepAsExpr(); 2988 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2989 if (Result.isInvalid()) return true; 2990 DS.UpdateExprRep(Result.get()); 2991 break; 2992 } 2993 2994 default: 2995 // Nothing to do for these decl specs. 2996 break; 2997 } 2998 2999 // It doesn't matter what order we do this in. 3000 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3001 DeclaratorChunk &Chunk = D.getTypeObject(I); 3002 3003 // The only type information in the declarator which can come 3004 // before the declaration name is the base type of a member 3005 // pointer. 3006 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3007 continue; 3008 3009 // Rebuild the scope specifier in-place. 3010 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3011 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3012 return true; 3013 } 3014 3015 return false; 3016} 3017 3018Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3019 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), 3020 /*IsFunctionDefinition=*/false); 3021} 3022 3023/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3024/// If T is the name of a class, then each of the following shall have a 3025/// name different from T: 3026/// - every static data member of class T; 3027/// - every member function of class T 3028/// - every member of class T that is itself a type; 3029/// \returns true if the declaration name violates these rules. 3030bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3031 DeclarationNameInfo NameInfo) { 3032 DeclarationName Name = NameInfo.getName(); 3033 3034 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3035 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3036 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3037 return true; 3038 } 3039 3040 return false; 3041} 3042 3043Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3044 MultiTemplateParamsArg TemplateParamLists, 3045 bool IsFunctionDefinition) { 3046 // TODO: consider using NameInfo for diagnostic. 3047 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3048 DeclarationName Name = NameInfo.getName(); 3049 3050 // All of these full declarators require an identifier. If it doesn't have 3051 // one, the ParsedFreeStandingDeclSpec action should be used. 3052 if (!Name) { 3053 if (!D.isInvalidType()) // Reject this if we think it is valid. 3054 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3055 diag::err_declarator_need_ident) 3056 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3057 return 0; 3058 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3059 return 0; 3060 3061 // The scope passed in may not be a decl scope. Zip up the scope tree until 3062 // we find one that is. 3063 while ((S->getFlags() & Scope::DeclScope) == 0 || 3064 (S->getFlags() & Scope::TemplateParamScope) != 0) 3065 S = S->getParent(); 3066 3067 DeclContext *DC = CurContext; 3068 if (D.getCXXScopeSpec().isInvalid()) 3069 D.setInvalidType(); 3070 else if (D.getCXXScopeSpec().isSet()) { 3071 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3072 UPPC_DeclarationQualifier)) 3073 return 0; 3074 3075 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3076 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3077 if (!DC) { 3078 // If we could not compute the declaration context, it's because the 3079 // declaration context is dependent but does not refer to a class, 3080 // class template, or class template partial specialization. Complain 3081 // and return early, to avoid the coming semantic disaster. 3082 Diag(D.getIdentifierLoc(), 3083 diag::err_template_qualified_declarator_no_match) 3084 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3085 << D.getCXXScopeSpec().getRange(); 3086 return 0; 3087 } 3088 bool IsDependentContext = DC->isDependentContext(); 3089 3090 if (!IsDependentContext && 3091 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3092 return 0; 3093 3094 if (isa<CXXRecordDecl>(DC)) { 3095 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3096 Diag(D.getIdentifierLoc(), 3097 diag::err_member_def_undefined_record) 3098 << Name << DC << D.getCXXScopeSpec().getRange(); 3099 D.setInvalidType(); 3100 } else if (isa<CXXRecordDecl>(CurContext) && 3101 !D.getDeclSpec().isFriendSpecified()) { 3102 // The user provided a superfluous scope specifier inside a class 3103 // definition: 3104 // 3105 // class X { 3106 // void X::f(); 3107 // }; 3108 if (CurContext->Equals(DC)) 3109 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3110 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3111 else 3112 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3113 << Name << D.getCXXScopeSpec().getRange(); 3114 3115 // Pretend that this qualifier was not here. 3116 D.getCXXScopeSpec().clear(); 3117 } 3118 } 3119 3120 // Check whether we need to rebuild the type of the given 3121 // declaration in the current instantiation. 3122 if (EnteringContext && IsDependentContext && 3123 TemplateParamLists.size() != 0) { 3124 ContextRAII SavedContext(*this, DC); 3125 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3126 D.setInvalidType(); 3127 } 3128 } 3129 3130 if (DiagnoseClassNameShadow(DC, NameInfo)) 3131 // If this is a typedef, we'll end up spewing multiple diagnostics. 3132 // Just return early; it's safer. 3133 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3134 return 0; 3135 3136 NamedDecl *New; 3137 3138 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3139 QualType R = TInfo->getType(); 3140 3141 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3142 UPPC_DeclarationType)) 3143 D.setInvalidType(); 3144 3145 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3146 ForRedeclaration); 3147 3148 // See if this is a redefinition of a variable in the same scope. 3149 if (!D.getCXXScopeSpec().isSet()) { 3150 bool IsLinkageLookup = false; 3151 3152 // If the declaration we're planning to build will be a function 3153 // or object with linkage, then look for another declaration with 3154 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3155 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3156 /* Do nothing*/; 3157 else if (R->isFunctionType()) { 3158 if (CurContext->isFunctionOrMethod() || 3159 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3160 IsLinkageLookup = true; 3161 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3162 IsLinkageLookup = true; 3163 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3164 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3165 IsLinkageLookup = true; 3166 3167 if (IsLinkageLookup) 3168 Previous.clear(LookupRedeclarationWithLinkage); 3169 3170 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3171 } else { // Something like "int foo::x;" 3172 LookupQualifiedName(Previous, DC); 3173 3174 // Don't consider using declarations as previous declarations for 3175 // out-of-line members. 3176 RemoveUsingDecls(Previous); 3177 3178 // C++ 7.3.1.2p2: 3179 // Members (including explicit specializations of templates) of a named 3180 // namespace can also be defined outside that namespace by explicit 3181 // qualification of the name being defined, provided that the entity being 3182 // defined was already declared in the namespace and the definition appears 3183 // after the point of declaration in a namespace that encloses the 3184 // declarations namespace. 3185 // 3186 // Note that we only check the context at this point. We don't yet 3187 // have enough information to make sure that PrevDecl is actually 3188 // the declaration we want to match. For example, given: 3189 // 3190 // class X { 3191 // void f(); 3192 // void f(float); 3193 // }; 3194 // 3195 // void X::f(int) { } // ill-formed 3196 // 3197 // In this case, PrevDecl will point to the overload set 3198 // containing the two f's declared in X, but neither of them 3199 // matches. 3200 3201 // First check whether we named the global scope. 3202 if (isa<TranslationUnitDecl>(DC)) { 3203 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3204 << Name << D.getCXXScopeSpec().getRange(); 3205 } else { 3206 DeclContext *Cur = CurContext; 3207 while (isa<LinkageSpecDecl>(Cur)) 3208 Cur = Cur->getParent(); 3209 if (!Cur->Encloses(DC)) { 3210 // The qualifying scope doesn't enclose the original declaration. 3211 // Emit diagnostic based on current scope. 3212 SourceLocation L = D.getIdentifierLoc(); 3213 SourceRange R = D.getCXXScopeSpec().getRange(); 3214 if (isa<FunctionDecl>(Cur)) 3215 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3216 else 3217 Diag(L, diag::err_invalid_declarator_scope) 3218 << Name << cast<NamedDecl>(DC) << R; 3219 D.setInvalidType(); 3220 } 3221 } 3222 } 3223 3224 if (Previous.isSingleResult() && 3225 Previous.getFoundDecl()->isTemplateParameter()) { 3226 // Maybe we will complain about the shadowed template parameter. 3227 if (!D.isInvalidType()) 3228 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3229 Previous.getFoundDecl())) 3230 D.setInvalidType(); 3231 3232 // Just pretend that we didn't see the previous declaration. 3233 Previous.clear(); 3234 } 3235 3236 // In C++, the previous declaration we find might be a tag type 3237 // (class or enum). In this case, the new declaration will hide the 3238 // tag type. Note that this does does not apply if we're declaring a 3239 // typedef (C++ [dcl.typedef]p4). 3240 if (Previous.isSingleTagDecl() && 3241 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3242 Previous.clear(); 3243 3244 bool Redeclaration = false; 3245 bool AddToScope = true; 3246 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3247 if (TemplateParamLists.size()) { 3248 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3249 return 0; 3250 } 3251 3252 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 3253 } else if (R->isFunctionType()) { 3254 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 3255 move(TemplateParamLists), 3256 IsFunctionDefinition, Redeclaration, 3257 AddToScope); 3258 } else { 3259 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 3260 move(TemplateParamLists), 3261 Redeclaration); 3262 } 3263 3264 if (New == 0) 3265 return 0; 3266 3267 // If this has an identifier and is not an invalid redeclaration or 3268 // function template specialization, add it to the scope stack. 3269 if (New->getDeclName() && AddToScope && 3270 !(Redeclaration && New->isInvalidDecl())) 3271 PushOnScopeChains(New, S); 3272 3273 return New; 3274} 3275 3276/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3277/// types into constant array types in certain situations which would otherwise 3278/// be errors (for GCC compatibility). 3279static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3280 ASTContext &Context, 3281 bool &SizeIsNegative, 3282 llvm::APSInt &Oversized) { 3283 // This method tries to turn a variable array into a constant 3284 // array even when the size isn't an ICE. This is necessary 3285 // for compatibility with code that depends on gcc's buggy 3286 // constant expression folding, like struct {char x[(int)(char*)2];} 3287 SizeIsNegative = false; 3288 Oversized = 0; 3289 3290 if (T->isDependentType()) 3291 return QualType(); 3292 3293 QualifierCollector Qs; 3294 const Type *Ty = Qs.strip(T); 3295 3296 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3297 QualType Pointee = PTy->getPointeeType(); 3298 QualType FixedType = 3299 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3300 Oversized); 3301 if (FixedType.isNull()) return FixedType; 3302 FixedType = Context.getPointerType(FixedType); 3303 return Qs.apply(Context, FixedType); 3304 } 3305 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3306 QualType Inner = PTy->getInnerType(); 3307 QualType FixedType = 3308 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3309 Oversized); 3310 if (FixedType.isNull()) return FixedType; 3311 FixedType = Context.getParenType(FixedType); 3312 return Qs.apply(Context, FixedType); 3313 } 3314 3315 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3316 if (!VLATy) 3317 return QualType(); 3318 // FIXME: We should probably handle this case 3319 if (VLATy->getElementType()->isVariablyModifiedType()) 3320 return QualType(); 3321 3322 Expr::EvalResult EvalResult; 3323 if (!VLATy->getSizeExpr() || 3324 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3325 !EvalResult.Val.isInt()) 3326 return QualType(); 3327 3328 // Check whether the array size is negative. 3329 llvm::APSInt &Res = EvalResult.Val.getInt(); 3330 if (Res.isSigned() && Res.isNegative()) { 3331 SizeIsNegative = true; 3332 return QualType(); 3333 } 3334 3335 // Check whether the array is too large to be addressed. 3336 unsigned ActiveSizeBits 3337 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3338 Res); 3339 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3340 Oversized = Res; 3341 return QualType(); 3342 } 3343 3344 return Context.getConstantArrayType(VLATy->getElementType(), 3345 Res, ArrayType::Normal, 0); 3346} 3347 3348/// \brief Register the given locally-scoped external C declaration so 3349/// that it can be found later for redeclarations 3350void 3351Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3352 const LookupResult &Previous, 3353 Scope *S) { 3354 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3355 "Decl is not a locally-scoped decl!"); 3356 // Note that we have a locally-scoped external with this name. 3357 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3358 3359 if (!Previous.isSingleResult()) 3360 return; 3361 3362 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3363 3364 // If there was a previous declaration of this variable, it may be 3365 // in our identifier chain. Update the identifier chain with the new 3366 // declaration. 3367 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3368 // The previous declaration was found on the identifer resolver 3369 // chain, so remove it from its scope. 3370 3371 if (S->isDeclScope(PrevDecl)) { 3372 // Special case for redeclarations in the SAME scope. 3373 // Because this declaration is going to be added to the identifier chain 3374 // later, we should temporarily take it OFF the chain. 3375 IdResolver.RemoveDecl(ND); 3376 3377 } else { 3378 // Find the scope for the original declaration. 3379 while (S && !S->isDeclScope(PrevDecl)) 3380 S = S->getParent(); 3381 } 3382 3383 if (S) 3384 S->RemoveDecl(PrevDecl); 3385 } 3386} 3387 3388llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3389Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3390 if (ExternalSource) { 3391 // Load locally-scoped external decls from the external source. 3392 SmallVector<NamedDecl *, 4> Decls; 3393 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3394 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3395 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3396 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3397 if (Pos == LocallyScopedExternalDecls.end()) 3398 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3399 } 3400 } 3401 3402 return LocallyScopedExternalDecls.find(Name); 3403} 3404 3405/// \brief Diagnose function specifiers on a declaration of an identifier that 3406/// does not identify a function. 3407void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3408 // FIXME: We should probably indicate the identifier in question to avoid 3409 // confusion for constructs like "inline int a(), b;" 3410 if (D.getDeclSpec().isInlineSpecified()) 3411 Diag(D.getDeclSpec().getInlineSpecLoc(), 3412 diag::err_inline_non_function); 3413 3414 if (D.getDeclSpec().isVirtualSpecified()) 3415 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3416 diag::err_virtual_non_function); 3417 3418 if (D.getDeclSpec().isExplicitSpecified()) 3419 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3420 diag::err_explicit_non_function); 3421} 3422 3423NamedDecl* 3424Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3425 QualType R, TypeSourceInfo *TInfo, 3426 LookupResult &Previous, bool &Redeclaration) { 3427 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3428 if (D.getCXXScopeSpec().isSet()) { 3429 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3430 << D.getCXXScopeSpec().getRange(); 3431 D.setInvalidType(); 3432 // Pretend we didn't see the scope specifier. 3433 DC = CurContext; 3434 Previous.clear(); 3435 } 3436 3437 if (getLangOptions().CPlusPlus) { 3438 // Check that there are no default arguments (C++ only). 3439 CheckExtraCXXDefaultArguments(D); 3440 } 3441 3442 DiagnoseFunctionSpecifiers(D); 3443 3444 if (D.getDeclSpec().isThreadSpecified()) 3445 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3446 if (D.getDeclSpec().isConstexprSpecified()) 3447 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3448 << 1; 3449 3450 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3451 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3452 << D.getName().getSourceRange(); 3453 return 0; 3454 } 3455 3456 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 3457 if (!NewTD) return 0; 3458 3459 // Handle attributes prior to checking for duplicates in MergeVarDecl 3460 ProcessDeclAttributes(S, NewTD, D); 3461 3462 CheckTypedefForVariablyModifiedType(S, NewTD); 3463 3464 return ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3465} 3466 3467void 3468Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3469 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3470 // then it shall have block scope. 3471 // Note that variably modified types must be fixed before merging the decl so 3472 // that redeclarations will match. 3473 QualType T = NewTD->getUnderlyingType(); 3474 if (T->isVariablyModifiedType()) { 3475 getCurFunction()->setHasBranchProtectedScope(); 3476 3477 if (S->getFnParent() == 0) { 3478 bool SizeIsNegative; 3479 llvm::APSInt Oversized; 3480 QualType FixedTy = 3481 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3482 Oversized); 3483 if (!FixedTy.isNull()) { 3484 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3485 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3486 } else { 3487 if (SizeIsNegative) 3488 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3489 else if (T->isVariableArrayType()) 3490 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3491 else if (Oversized.getBoolValue()) 3492 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3493 else 3494 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3495 NewTD->setInvalidDecl(); 3496 } 3497 } 3498 } 3499} 3500 3501 3502/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3503/// declares a typedef-name, either using the 'typedef' type specifier or via 3504/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3505NamedDecl* 3506Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3507 LookupResult &Previous, bool &Redeclaration) { 3508 // Merge the decl with the existing one if appropriate. If the decl is 3509 // in an outer scope, it isn't the same thing. 3510 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3511 /*ExplicitInstantiationOrSpecialization=*/false); 3512 if (!Previous.empty()) { 3513 Redeclaration = true; 3514 MergeTypedefNameDecl(NewTD, Previous); 3515 } 3516 3517 // If this is the C FILE type, notify the AST context. 3518 if (IdentifierInfo *II = NewTD->getIdentifier()) 3519 if (!NewTD->isInvalidDecl() && 3520 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3521 if (II->isStr("FILE")) 3522 Context.setFILEDecl(NewTD); 3523 else if (II->isStr("jmp_buf")) 3524 Context.setjmp_bufDecl(NewTD); 3525 else if (II->isStr("sigjmp_buf")) 3526 Context.setsigjmp_bufDecl(NewTD); 3527 else if (II->isStr("__builtin_va_list")) 3528 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3529 } 3530 3531 return NewTD; 3532} 3533 3534/// \brief Determines whether the given declaration is an out-of-scope 3535/// previous declaration. 3536/// 3537/// This routine should be invoked when name lookup has found a 3538/// previous declaration (PrevDecl) that is not in the scope where a 3539/// new declaration by the same name is being introduced. If the new 3540/// declaration occurs in a local scope, previous declarations with 3541/// linkage may still be considered previous declarations (C99 3542/// 6.2.2p4-5, C++ [basic.link]p6). 3543/// 3544/// \param PrevDecl the previous declaration found by name 3545/// lookup 3546/// 3547/// \param DC the context in which the new declaration is being 3548/// declared. 3549/// 3550/// \returns true if PrevDecl is an out-of-scope previous declaration 3551/// for a new delcaration with the same name. 3552static bool 3553isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3554 ASTContext &Context) { 3555 if (!PrevDecl) 3556 return false; 3557 3558 if (!PrevDecl->hasLinkage()) 3559 return false; 3560 3561 if (Context.getLangOptions().CPlusPlus) { 3562 // C++ [basic.link]p6: 3563 // If there is a visible declaration of an entity with linkage 3564 // having the same name and type, ignoring entities declared 3565 // outside the innermost enclosing namespace scope, the block 3566 // scope declaration declares that same entity and receives the 3567 // linkage of the previous declaration. 3568 DeclContext *OuterContext = DC->getRedeclContext(); 3569 if (!OuterContext->isFunctionOrMethod()) 3570 // This rule only applies to block-scope declarations. 3571 return false; 3572 3573 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3574 if (PrevOuterContext->isRecord()) 3575 // We found a member function: ignore it. 3576 return false; 3577 3578 // Find the innermost enclosing namespace for the new and 3579 // previous declarations. 3580 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3581 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3582 3583 // The previous declaration is in a different namespace, so it 3584 // isn't the same function. 3585 if (!OuterContext->Equals(PrevOuterContext)) 3586 return false; 3587 } 3588 3589 return true; 3590} 3591 3592static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3593 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3594 if (!SS.isSet()) return; 3595 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3596} 3597 3598bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3599 QualType type = decl->getType(); 3600 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3601 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3602 // Various kinds of declaration aren't allowed to be __autoreleasing. 3603 unsigned kind = -1U; 3604 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3605 if (var->hasAttr<BlocksAttr>()) 3606 kind = 0; // __block 3607 else if (!var->hasLocalStorage()) 3608 kind = 1; // global 3609 } else if (isa<ObjCIvarDecl>(decl)) { 3610 kind = 3; // ivar 3611 } else if (isa<FieldDecl>(decl)) { 3612 kind = 2; // field 3613 } 3614 3615 if (kind != -1U) { 3616 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3617 << kind; 3618 } 3619 } else if (lifetime == Qualifiers::OCL_None) { 3620 // Try to infer lifetime. 3621 if (!type->isObjCLifetimeType()) 3622 return false; 3623 3624 lifetime = type->getObjCARCImplicitLifetime(); 3625 type = Context.getLifetimeQualifiedType(type, lifetime); 3626 decl->setType(type); 3627 } 3628 3629 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3630 // Thread-local variables cannot have lifetime. 3631 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3632 var->isThreadSpecified()) { 3633 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3634 << var->getType(); 3635 return true; 3636 } 3637 } 3638 3639 return false; 3640} 3641 3642NamedDecl* 3643Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3644 QualType R, TypeSourceInfo *TInfo, 3645 LookupResult &Previous, 3646 MultiTemplateParamsArg TemplateParamLists, 3647 bool &Redeclaration) { 3648 DeclarationName Name = GetNameForDeclarator(D).getName(); 3649 3650 // Check that there are no default arguments (C++ only). 3651 if (getLangOptions().CPlusPlus) 3652 CheckExtraCXXDefaultArguments(D); 3653 3654 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3655 assert(SCSpec != DeclSpec::SCS_typedef && 3656 "Parser allowed 'typedef' as storage class VarDecl."); 3657 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3658 if (SCSpec == DeclSpec::SCS_mutable) { 3659 // mutable can only appear on non-static class members, so it's always 3660 // an error here 3661 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3662 D.setInvalidType(); 3663 SC = SC_None; 3664 } 3665 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3666 VarDecl::StorageClass SCAsWritten 3667 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3668 3669 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3670 if (!II) { 3671 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3672 << Name.getAsString(); 3673 return 0; 3674 } 3675 3676 DiagnoseFunctionSpecifiers(D); 3677 3678 if (!DC->isRecord() && S->getFnParent() == 0) { 3679 // C99 6.9p2: The storage-class specifiers auto and register shall not 3680 // appear in the declaration specifiers in an external declaration. 3681 if (SC == SC_Auto || SC == SC_Register) { 3682 3683 // If this is a register variable with an asm label specified, then this 3684 // is a GNU extension. 3685 if (SC == SC_Register && D.getAsmLabel()) 3686 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3687 else 3688 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3689 D.setInvalidType(); 3690 } 3691 } 3692 3693 bool isExplicitSpecialization = false; 3694 VarDecl *NewVD; 3695 if (!getLangOptions().CPlusPlus) { 3696 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3697 D.getIdentifierLoc(), II, 3698 R, TInfo, SC, SCAsWritten); 3699 3700 if (D.isInvalidType()) 3701 NewVD->setInvalidDecl(); 3702 } else { 3703 if (DC->isRecord() && !CurContext->isRecord()) { 3704 // This is an out-of-line definition of a static data member. 3705 if (SC == SC_Static) { 3706 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3707 diag::err_static_out_of_line) 3708 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3709 } else if (SC == SC_None) 3710 SC = SC_Static; 3711 } 3712 if (SC == SC_Static) { 3713 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3714 if (RD->isLocalClass()) 3715 Diag(D.getIdentifierLoc(), 3716 diag::err_static_data_member_not_allowed_in_local_class) 3717 << Name << RD->getDeclName(); 3718 3719 // C++ [class.union]p1: If a union contains a static data member, 3720 // the program is ill-formed. 3721 // 3722 // We also disallow static data members in anonymous structs. 3723 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3724 Diag(D.getIdentifierLoc(), 3725 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3726 << Name << RD->isUnion(); 3727 } 3728 } 3729 3730 // Match up the template parameter lists with the scope specifier, then 3731 // determine whether we have a template or a template specialization. 3732 isExplicitSpecialization = false; 3733 bool Invalid = false; 3734 if (TemplateParameterList *TemplateParams 3735 = MatchTemplateParametersToScopeSpecifier( 3736 D.getDeclSpec().getSourceRange().getBegin(), 3737 D.getIdentifierLoc(), 3738 D.getCXXScopeSpec(), 3739 TemplateParamLists.get(), 3740 TemplateParamLists.size(), 3741 /*never a friend*/ false, 3742 isExplicitSpecialization, 3743 Invalid)) { 3744 if (TemplateParams->size() > 0) { 3745 // There is no such thing as a variable template. 3746 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3747 << II 3748 << SourceRange(TemplateParams->getTemplateLoc(), 3749 TemplateParams->getRAngleLoc()); 3750 return 0; 3751 } else { 3752 // There is an extraneous 'template<>' for this variable. Complain 3753 // about it, but allow the declaration of the variable. 3754 Diag(TemplateParams->getTemplateLoc(), 3755 diag::err_template_variable_noparams) 3756 << II 3757 << SourceRange(TemplateParams->getTemplateLoc(), 3758 TemplateParams->getRAngleLoc()); 3759 } 3760 } 3761 3762 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3763 D.getIdentifierLoc(), II, 3764 R, TInfo, SC, SCAsWritten); 3765 3766 // If this decl has an auto type in need of deduction, make a note of the 3767 // Decl so we can diagnose uses of it in its own initializer. 3768 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3769 R->getContainedAutoType()) 3770 ParsingInitForAutoVars.insert(NewVD); 3771 3772 if (D.isInvalidType() || Invalid) 3773 NewVD->setInvalidDecl(); 3774 3775 SetNestedNameSpecifier(NewVD, D); 3776 3777 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3778 NewVD->setTemplateParameterListsInfo(Context, 3779 TemplateParamLists.size(), 3780 TemplateParamLists.release()); 3781 } 3782 3783 if (D.getDeclSpec().isConstexprSpecified()) { 3784 // FIXME: check this is a valid use of constexpr. 3785 NewVD->setConstexpr(true); 3786 } 3787 } 3788 3789 if (D.getDeclSpec().isThreadSpecified()) { 3790 if (NewVD->hasLocalStorage()) 3791 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3792 else if (!Context.Target.isTLSSupported()) 3793 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3794 else 3795 NewVD->setThreadSpecified(true); 3796 } 3797 3798 // Set the lexical context. If the declarator has a C++ scope specifier, the 3799 // lexical context will be different from the semantic context. 3800 NewVD->setLexicalDeclContext(CurContext); 3801 3802 // Handle attributes prior to checking for duplicates in MergeVarDecl 3803 ProcessDeclAttributes(S, NewVD, D); 3804 3805 // In auto-retain/release, infer strong retension for variables of 3806 // retainable type. 3807 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3808 NewVD->setInvalidDecl(); 3809 3810 // Handle GNU asm-label extension (encoded as an attribute). 3811 if (Expr *E = (Expr*)D.getAsmLabel()) { 3812 // The parser guarantees this is a string. 3813 StringLiteral *SE = cast<StringLiteral>(E); 3814 StringRef Label = SE->getString(); 3815 if (S->getFnParent() != 0) { 3816 switch (SC) { 3817 case SC_None: 3818 case SC_Auto: 3819 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3820 break; 3821 case SC_Register: 3822 if (!Context.Target.isValidGCCRegisterName(Label)) 3823 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3824 break; 3825 case SC_Static: 3826 case SC_Extern: 3827 case SC_PrivateExtern: 3828 break; 3829 } 3830 } 3831 3832 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3833 Context, Label)); 3834 } 3835 3836 // Diagnose shadowed variables before filtering for scope. 3837 if (!D.getCXXScopeSpec().isSet()) 3838 CheckShadow(S, NewVD, Previous); 3839 3840 // Don't consider existing declarations that are in a different 3841 // scope and are out-of-semantic-context declarations (if the new 3842 // declaration has linkage). 3843 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 3844 isExplicitSpecialization); 3845 3846 if (!getLangOptions().CPlusPlus) 3847 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3848 else { 3849 // Merge the decl with the existing one if appropriate. 3850 if (!Previous.empty()) { 3851 if (Previous.isSingleResult() && 3852 isa<FieldDecl>(Previous.getFoundDecl()) && 3853 D.getCXXScopeSpec().isSet()) { 3854 // The user tried to define a non-static data member 3855 // out-of-line (C++ [dcl.meaning]p1). 3856 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3857 << D.getCXXScopeSpec().getRange(); 3858 Previous.clear(); 3859 NewVD->setInvalidDecl(); 3860 } 3861 } else if (D.getCXXScopeSpec().isSet()) { 3862 // No previous declaration in the qualifying scope. 3863 Diag(D.getIdentifierLoc(), diag::err_no_member) 3864 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3865 << D.getCXXScopeSpec().getRange(); 3866 NewVD->setInvalidDecl(); 3867 } 3868 3869 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3870 3871 // This is an explicit specialization of a static data member. Check it. 3872 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3873 CheckMemberSpecialization(NewVD, Previous)) 3874 NewVD->setInvalidDecl(); 3875 } 3876 3877 // attributes declared post-definition are currently ignored 3878 // FIXME: This should be handled in attribute merging, not 3879 // here. 3880 if (Previous.isSingleResult()) { 3881 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3882 if (Def && (Def = Def->getDefinition()) && 3883 Def != NewVD && D.hasAttributes()) { 3884 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3885 Diag(Def->getLocation(), diag::note_previous_definition); 3886 } 3887 } 3888 3889 // If this is a locally-scoped extern C variable, update the map of 3890 // such variables. 3891 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3892 !NewVD->isInvalidDecl()) 3893 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3894 3895 // If there's a #pragma GCC visibility in scope, and this isn't a class 3896 // member, set the visibility of this variable. 3897 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3898 AddPushedVisibilityAttribute(NewVD); 3899 3900 MarkUnusedFileScopedDecl(NewVD); 3901 3902 return NewVD; 3903} 3904 3905/// \brief Diagnose variable or built-in function shadowing. Implements 3906/// -Wshadow. 3907/// 3908/// This method is called whenever a VarDecl is added to a "useful" 3909/// scope. 3910/// 3911/// \param S the scope in which the shadowing name is being declared 3912/// \param R the lookup of the name 3913/// 3914void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 3915 // Return if warning is ignored. 3916 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 3917 Diagnostic::Ignored) 3918 return; 3919 3920 // Don't diagnose declarations at file scope. 3921 if (D->hasGlobalStorage()) 3922 return; 3923 3924 DeclContext *NewDC = D->getDeclContext(); 3925 3926 // Only diagnose if we're shadowing an unambiguous field or variable. 3927 if (R.getResultKind() != LookupResult::Found) 3928 return; 3929 3930 NamedDecl* ShadowedDecl = R.getFoundDecl(); 3931 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 3932 return; 3933 3934 // Fields are not shadowed by variables in C++ static methods. 3935 if (isa<FieldDecl>(ShadowedDecl)) 3936 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 3937 if (MD->isStatic()) 3938 return; 3939 3940 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 3941 if (shadowedVar->isExternC()) { 3942 // For shadowing external vars, make sure that we point to the global 3943 // declaration, not a locally scoped extern declaration. 3944 for (VarDecl::redecl_iterator 3945 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 3946 I != E; ++I) 3947 if (I->isFileVarDecl()) { 3948 ShadowedDecl = *I; 3949 break; 3950 } 3951 } 3952 3953 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 3954 3955 // Only warn about certain kinds of shadowing for class members. 3956 if (NewDC && NewDC->isRecord()) { 3957 // In particular, don't warn about shadowing non-class members. 3958 if (!OldDC->isRecord()) 3959 return; 3960 3961 // TODO: should we warn about static data members shadowing 3962 // static data members from base classes? 3963 3964 // TODO: don't diagnose for inaccessible shadowed members. 3965 // This is hard to do perfectly because we might friend the 3966 // shadowing context, but that's just a false negative. 3967 } 3968 3969 // Determine what kind of declaration we're shadowing. 3970 unsigned Kind; 3971 if (isa<RecordDecl>(OldDC)) { 3972 if (isa<FieldDecl>(ShadowedDecl)) 3973 Kind = 3; // field 3974 else 3975 Kind = 2; // static data member 3976 } else if (OldDC->isFileContext()) 3977 Kind = 1; // global 3978 else 3979 Kind = 0; // local 3980 3981 DeclarationName Name = R.getLookupName(); 3982 3983 // Emit warning and note. 3984 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 3985 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 3986} 3987 3988/// \brief Check -Wshadow without the advantage of a previous lookup. 3989void Sema::CheckShadow(Scope *S, VarDecl *D) { 3990 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 3991 Diagnostic::Ignored) 3992 return; 3993 3994 LookupResult R(*this, D->getDeclName(), D->getLocation(), 3995 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 3996 LookupName(R, S); 3997 CheckShadow(S, D, R); 3998} 3999 4000/// \brief Perform semantic checking on a newly-created variable 4001/// declaration. 4002/// 4003/// This routine performs all of the type-checking required for a 4004/// variable declaration once it has been built. It is used both to 4005/// check variables after they have been parsed and their declarators 4006/// have been translated into a declaration, and to check variables 4007/// that have been instantiated from a template. 4008/// 4009/// Sets NewVD->isInvalidDecl() if an error was encountered. 4010void Sema::CheckVariableDeclaration(VarDecl *NewVD, 4011 LookupResult &Previous, 4012 bool &Redeclaration) { 4013 // If the decl is already known invalid, don't check it. 4014 if (NewVD->isInvalidDecl()) 4015 return; 4016 4017 QualType T = NewVD->getType(); 4018 4019 if (T->isObjCObjectType()) { 4020 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4021 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4022 T = Context.getObjCObjectPointerType(T); 4023 NewVD->setType(T); 4024 } 4025 4026 // Emit an error if an address space was applied to decl with local storage. 4027 // This includes arrays of objects with address space qualifiers, but not 4028 // automatic variables that point to other address spaces. 4029 // ISO/IEC TR 18037 S5.1.2 4030 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4031 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4032 return NewVD->setInvalidDecl(); 4033 } 4034 4035 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4036 && !NewVD->hasAttr<BlocksAttr>()) { 4037 if (getLangOptions().getGCMode() != LangOptions::NonGC) 4038 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4039 else 4040 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4041 } 4042 4043 bool isVM = T->isVariablyModifiedType(); 4044 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4045 NewVD->hasAttr<BlocksAttr>()) 4046 getCurFunction()->setHasBranchProtectedScope(); 4047 4048 if ((isVM && NewVD->hasLinkage()) || 4049 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4050 bool SizeIsNegative; 4051 llvm::APSInt Oversized; 4052 QualType FixedTy = 4053 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4054 Oversized); 4055 4056 if (FixedTy.isNull() && T->isVariableArrayType()) { 4057 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4058 // FIXME: This won't give the correct result for 4059 // int a[10][n]; 4060 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4061 4062 if (NewVD->isFileVarDecl()) 4063 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4064 << SizeRange; 4065 else if (NewVD->getStorageClass() == SC_Static) 4066 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4067 << SizeRange; 4068 else 4069 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4070 << SizeRange; 4071 return NewVD->setInvalidDecl(); 4072 } 4073 4074 if (FixedTy.isNull()) { 4075 if (NewVD->isFileVarDecl()) 4076 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4077 else 4078 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4079 return NewVD->setInvalidDecl(); 4080 } 4081 4082 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4083 NewVD->setType(FixedTy); 4084 } 4085 4086 if (Previous.empty() && NewVD->isExternC()) { 4087 // Since we did not find anything by this name and we're declaring 4088 // an extern "C" variable, look for a non-visible extern "C" 4089 // declaration with the same name. 4090 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4091 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4092 if (Pos != LocallyScopedExternalDecls.end()) 4093 Previous.addDecl(Pos->second); 4094 } 4095 4096 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4097 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4098 << T; 4099 return NewVD->setInvalidDecl(); 4100 } 4101 4102 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4103 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4104 return NewVD->setInvalidDecl(); 4105 } 4106 4107 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4108 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4109 return NewVD->setInvalidDecl(); 4110 } 4111 4112 // Function pointers and references cannot have qualified function type, only 4113 // function pointer-to-members can do that. 4114 QualType Pointee; 4115 unsigned PtrOrRef = 0; 4116 if (const PointerType *Ptr = T->getAs<PointerType>()) 4117 Pointee = Ptr->getPointeeType(); 4118 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4119 Pointee = Ref->getPointeeType(); 4120 PtrOrRef = 1; 4121 } 4122 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4123 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4124 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4125 << PtrOrRef; 4126 return NewVD->setInvalidDecl(); 4127 } 4128 4129 if (!Previous.empty()) { 4130 Redeclaration = true; 4131 MergeVarDecl(NewVD, Previous); 4132 } 4133} 4134 4135/// \brief Data used with FindOverriddenMethod 4136struct FindOverriddenMethodData { 4137 Sema *S; 4138 CXXMethodDecl *Method; 4139}; 4140 4141/// \brief Member lookup function that determines whether a given C++ 4142/// method overrides a method in a base class, to be used with 4143/// CXXRecordDecl::lookupInBases(). 4144static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4145 CXXBasePath &Path, 4146 void *UserData) { 4147 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4148 4149 FindOverriddenMethodData *Data 4150 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4151 4152 DeclarationName Name = Data->Method->getDeclName(); 4153 4154 // FIXME: Do we care about other names here too? 4155 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4156 // We really want to find the base class destructor here. 4157 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4158 CanQualType CT = Data->S->Context.getCanonicalType(T); 4159 4160 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4161 } 4162 4163 for (Path.Decls = BaseRecord->lookup(Name); 4164 Path.Decls.first != Path.Decls.second; 4165 ++Path.Decls.first) { 4166 NamedDecl *D = *Path.Decls.first; 4167 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4168 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4169 return true; 4170 } 4171 } 4172 4173 return false; 4174} 4175 4176/// AddOverriddenMethods - See if a method overrides any in the base classes, 4177/// and if so, check that it's a valid override and remember it. 4178bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4179 // Look for virtual methods in base classes that this method might override. 4180 CXXBasePaths Paths; 4181 FindOverriddenMethodData Data; 4182 Data.Method = MD; 4183 Data.S = this; 4184 bool AddedAny = false; 4185 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4186 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4187 E = Paths.found_decls_end(); I != E; ++I) { 4188 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4189 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4190 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4191 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4192 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4193 AddedAny = true; 4194 } 4195 } 4196 } 4197 } 4198 4199 return AddedAny; 4200} 4201 4202static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD, 4203 bool isFriendDecl) { 4204 DeclarationName Name = NewFD->getDeclName(); 4205 DeclContext *DC = NewFD->getDeclContext(); 4206 LookupResult Prev(S, Name, NewFD->getLocation(), 4207 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4208 llvm::SmallVector<unsigned, 1> MismatchedParams; 4209 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4210 TypoCorrection Correction; 4211 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4212 : diag::err_member_def_does_not_match; 4213 4214 NewFD->setInvalidDecl(); 4215 S.LookupQualifiedName(Prev, DC); 4216 assert(!Prev.isAmbiguous() && 4217 "Cannot have an ambiguity in previous-declaration lookup"); 4218 if (!Prev.empty()) { 4219 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4220 Func != FuncEnd; ++Func) { 4221 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4222 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4223 MismatchedParams)) { 4224 // Add 1 to the index so that 0 can mean the mismatch didn't 4225 // involve a parameter 4226 unsigned ParamNum = 4227 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4228 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4229 } 4230 } 4231 // If the qualified name lookup yielded nothing, try typo correction 4232 } else if ((Correction = S.CorrectTypo(Prev.getLookupNameInfo(), 4233 Prev.getLookupKind(), 0, 0, DC)) && 4234 Correction.getCorrection() != Name) { 4235 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4236 : diag::err_member_def_does_not_match_suggest; 4237 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4238 CDeclEnd = Correction.end(); 4239 CDecl != CDeclEnd; ++CDecl) { 4240 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4241 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4242 MismatchedParams)) { 4243 // Add 1 to the index so that 0 can mean the mismatch didn't 4244 // involve a parameter 4245 unsigned ParamNum = 4246 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4247 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4248 } 4249 } 4250 } 4251 4252 if (Correction) 4253 S.Diag(NewFD->getLocation(), DiagMsg) 4254 << Name << DC << Correction.getQuoted(S.getLangOptions()) 4255 << FixItHint::CreateReplacement( 4256 NewFD->getLocation(), Correction.getAsString(S.getLangOptions())); 4257 else 4258 S.Diag(NewFD->getLocation(), DiagMsg) << Name << DC << NewFD->getLocation(); 4259 4260 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4261 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4262 NearMatch != NearMatchEnd; ++NearMatch) { 4263 FunctionDecl *FD = NearMatch->first; 4264 4265 if (unsigned Idx = NearMatch->second) { 4266 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4267 S.Diag(FDParam->getTypeSpecStartLoc(), 4268 diag::note_member_def_close_param_match) 4269 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4270 } else if (Correction) { 4271 S.Diag(FD->getLocation(), diag::note_previous_decl) 4272 << Correction.getQuoted(S.getLangOptions()); 4273 } else 4274 S.Diag(FD->getLocation(), diag::note_member_def_close_match); 4275 } 4276} 4277 4278NamedDecl* 4279Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4280 QualType R, TypeSourceInfo *TInfo, 4281 LookupResult &Previous, 4282 MultiTemplateParamsArg TemplateParamLists, 4283 bool IsFunctionDefinition, bool &Redeclaration, 4284 bool &AddToScope) { 4285 assert(R.getTypePtr()->isFunctionType()); 4286 4287 // TODO: consider using NameInfo for diagnostic. 4288 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4289 DeclarationName Name = NameInfo.getName(); 4290 FunctionDecl::StorageClass SC = SC_None; 4291 switch (D.getDeclSpec().getStorageClassSpec()) { 4292 default: assert(0 && "Unknown storage class!"); 4293 case DeclSpec::SCS_auto: 4294 case DeclSpec::SCS_register: 4295 case DeclSpec::SCS_mutable: 4296 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4297 diag::err_typecheck_sclass_func); 4298 D.setInvalidType(); 4299 break; 4300 case DeclSpec::SCS_unspecified: SC = SC_None; break; 4301 case DeclSpec::SCS_extern: SC = SC_Extern; break; 4302 case DeclSpec::SCS_static: { 4303 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 4304 // C99 6.7.1p5: 4305 // The declaration of an identifier for a function that has 4306 // block scope shall have no explicit storage-class specifier 4307 // other than extern 4308 // See also (C++ [dcl.stc]p4). 4309 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4310 diag::err_static_block_func); 4311 SC = SC_None; 4312 } else 4313 SC = SC_Static; 4314 break; 4315 } 4316 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 4317 } 4318 4319 if (D.getDeclSpec().isThreadSpecified()) 4320 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4321 4322 // Do not allow returning a objc interface by-value. 4323 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4324 Diag(D.getIdentifierLoc(), 4325 diag::err_object_cannot_be_passed_returned_by_value) << 0 4326 << R->getAs<FunctionType>()->getResultType() 4327 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4328 4329 QualType T = R->getAs<FunctionType>()->getResultType(); 4330 T = Context.getObjCObjectPointerType(T); 4331 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4332 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4333 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4334 FPT->getNumArgs(), EPI); 4335 } 4336 else if (isa<FunctionNoProtoType>(R)) 4337 R = Context.getFunctionNoProtoType(T); 4338 } 4339 4340 FunctionDecl *NewFD; 4341 bool isInline = D.getDeclSpec().isInlineSpecified(); 4342 bool isFriend = false; 4343 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4344 FunctionDecl::StorageClass SCAsWritten 4345 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4346 FunctionTemplateDecl *FunctionTemplate = 0; 4347 bool isExplicitSpecialization = false; 4348 bool isFunctionTemplateSpecialization = false; 4349 bool isDependentClassScopeExplicitSpecialization = false; 4350 4351 if (!getLangOptions().CPlusPlus) { 4352 // Determine whether the function was written with a 4353 // prototype. This true when: 4354 // - there is a prototype in the declarator, or 4355 // - the type R of the function is some kind of typedef or other reference 4356 // to a type name (which eventually refers to a function type). 4357 bool HasPrototype = 4358 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4359 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4360 4361 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4362 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4363 HasPrototype); 4364 if (D.isInvalidType()) 4365 NewFD->setInvalidDecl(); 4366 4367 // Set the lexical context. 4368 NewFD->setLexicalDeclContext(CurContext); 4369 // Filter out previous declarations that don't match the scope. 4370 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4371 /*ExplicitInstantiationOrSpecialization=*/false); 4372 } else { 4373 isFriend = D.getDeclSpec().isFriendSpecified(); 4374 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4375 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4376 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4377 bool isVirtualOkay = false; 4378 4379 // Check that the return type is not an abstract class type. 4380 // For record types, this is done by the AbstractClassUsageDiagnoser once 4381 // the class has been completely parsed. 4382 if (!DC->isRecord() && 4383 RequireNonAbstractType(D.getIdentifierLoc(), 4384 R->getAs<FunctionType>()->getResultType(), 4385 diag::err_abstract_type_in_decl, 4386 AbstractReturnType)) 4387 D.setInvalidType(); 4388 4389 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4390 // This is a C++ constructor declaration. 4391 assert(DC->isRecord() && 4392 "Constructors can only be declared in a member context"); 4393 4394 R = CheckConstructorDeclarator(D, R, SC); 4395 4396 // Create the new declaration 4397 CXXConstructorDecl *NewCD = CXXConstructorDecl::Create( 4398 Context, 4399 cast<CXXRecordDecl>(DC), 4400 D.getSourceRange().getBegin(), 4401 NameInfo, R, TInfo, 4402 isExplicit, isInline, 4403 /*isImplicitlyDeclared=*/false, 4404 isConstexpr); 4405 4406 NewFD = NewCD; 4407 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4408 // This is a C++ destructor declaration. 4409 if (DC->isRecord()) { 4410 R = CheckDestructorDeclarator(D, R, SC); 4411 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4412 4413 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(Context, Record, 4414 D.getSourceRange().getBegin(), 4415 NameInfo, R, TInfo, 4416 isInline, 4417 /*isImplicitlyDeclared=*/false); 4418 NewFD = NewDD; 4419 isVirtualOkay = true; 4420 4421 // If the class is complete, then we now create the implicit exception 4422 // specification. If the class is incomplete or dependent, we can't do 4423 // it yet. 4424 if (getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4425 Record->getDefinition() && !Record->isBeingDefined() && 4426 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4427 AdjustDestructorExceptionSpec(Record, NewDD); 4428 } 4429 4430 } else { 4431 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4432 4433 // Create a FunctionDecl to satisfy the function definition parsing 4434 // code path. 4435 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4436 D.getIdentifierLoc(), Name, R, TInfo, 4437 SC, SCAsWritten, isInline, 4438 /*hasPrototype=*/true, isConstexpr); 4439 D.setInvalidType(); 4440 } 4441 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4442 if (!DC->isRecord()) { 4443 Diag(D.getIdentifierLoc(), 4444 diag::err_conv_function_not_member); 4445 return 0; 4446 } 4447 4448 CheckConversionDeclarator(D, R, SC); 4449 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 4450 D.getSourceRange().getBegin(), 4451 NameInfo, R, TInfo, 4452 isInline, isExplicit, isConstexpr, 4453 SourceLocation()); 4454 4455 isVirtualOkay = true; 4456 } else if (DC->isRecord()) { 4457 // If the name of the function is the same as the name of the record, 4458 // then this must be an invalid constructor that has a return type. 4459 // (The parser checks for a return type and makes the declarator a 4460 // constructor if it has no return type). 4461 if (Name.getAsIdentifierInfo() && 4462 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4463 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4464 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4465 << SourceRange(D.getIdentifierLoc()); 4466 return 0; 4467 } 4468 4469 bool isStatic = SC == SC_Static; 4470 4471 // [class.free]p1: 4472 // Any allocation function for a class T is a static member 4473 // (even if not explicitly declared static). 4474 if (Name.getCXXOverloadedOperator() == OO_New || 4475 Name.getCXXOverloadedOperator() == OO_Array_New) 4476 isStatic = true; 4477 4478 // [class.free]p6 Any deallocation function for a class X is a static member 4479 // (even if not explicitly declared static). 4480 if (Name.getCXXOverloadedOperator() == OO_Delete || 4481 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4482 isStatic = true; 4483 4484 // This is a C++ method declaration. 4485 CXXMethodDecl *NewMD = CXXMethodDecl::Create( 4486 Context, cast<CXXRecordDecl>(DC), 4487 D.getSourceRange().getBegin(), 4488 NameInfo, R, TInfo, 4489 isStatic, SCAsWritten, isInline, 4490 isConstexpr, 4491 SourceLocation()); 4492 NewFD = NewMD; 4493 4494 isVirtualOkay = !isStatic; 4495 } else { 4496 // Determine whether the function was written with a 4497 // prototype. This true when: 4498 // - we're in C++ (where every function has a prototype), 4499 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4500 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4501 true/*HasPrototype*/, isConstexpr); 4502 } 4503 4504 if (isFriend && !isInline && IsFunctionDefinition) { 4505 // C++ [class.friend]p5 4506 // A function can be defined in a friend declaration of a 4507 // class . . . . Such a function is implicitly inline. 4508 NewFD->setImplicitlyInline(); 4509 } 4510 4511 SetNestedNameSpecifier(NewFD, D); 4512 isExplicitSpecialization = false; 4513 isFunctionTemplateSpecialization = false; 4514 if (D.isInvalidType()) 4515 NewFD->setInvalidDecl(); 4516 4517 // Set the lexical context. If the declarator has a C++ 4518 // scope specifier, or is the object of a friend declaration, the 4519 // lexical context will be different from the semantic context. 4520 NewFD->setLexicalDeclContext(CurContext); 4521 4522 // Match up the template parameter lists with the scope specifier, then 4523 // determine whether we have a template or a template specialization. 4524 bool Invalid = false; 4525 if (TemplateParameterList *TemplateParams 4526 = MatchTemplateParametersToScopeSpecifier( 4527 D.getDeclSpec().getSourceRange().getBegin(), 4528 D.getIdentifierLoc(), 4529 D.getCXXScopeSpec(), 4530 TemplateParamLists.get(), 4531 TemplateParamLists.size(), 4532 isFriend, 4533 isExplicitSpecialization, 4534 Invalid)) { 4535 if (TemplateParams->size() > 0) { 4536 // This is a function template 4537 4538 // Check that we can declare a template here. 4539 if (CheckTemplateDeclScope(S, TemplateParams)) 4540 return 0; 4541 4542 // A destructor cannot be a template. 4543 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4544 Diag(NewFD->getLocation(), diag::err_destructor_template); 4545 return 0; 4546 } 4547 4548 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4549 NewFD->getLocation(), 4550 Name, TemplateParams, 4551 NewFD); 4552 FunctionTemplate->setLexicalDeclContext(CurContext); 4553 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4554 4555 // For source fidelity, store the other template param lists. 4556 if (TemplateParamLists.size() > 1) { 4557 NewFD->setTemplateParameterListsInfo(Context, 4558 TemplateParamLists.size() - 1, 4559 TemplateParamLists.release()); 4560 } 4561 } else { 4562 // This is a function template specialization. 4563 isFunctionTemplateSpecialization = true; 4564 // For source fidelity, store all the template param lists. 4565 NewFD->setTemplateParameterListsInfo(Context, 4566 TemplateParamLists.size(), 4567 TemplateParamLists.release()); 4568 4569 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4570 if (isFriend) { 4571 // We want to remove the "template<>", found here. 4572 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4573 4574 // If we remove the template<> and the name is not a 4575 // template-id, we're actually silently creating a problem: 4576 // the friend declaration will refer to an untemplated decl, 4577 // and clearly the user wants a template specialization. So 4578 // we need to insert '<>' after the name. 4579 SourceLocation InsertLoc; 4580 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4581 InsertLoc = D.getName().getSourceRange().getEnd(); 4582 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4583 } 4584 4585 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4586 << Name << RemoveRange 4587 << FixItHint::CreateRemoval(RemoveRange) 4588 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4589 } 4590 } 4591 } 4592 else { 4593 // All template param lists were matched against the scope specifier: 4594 // this is NOT (an explicit specialization of) a template. 4595 if (TemplateParamLists.size() > 0) 4596 // For source fidelity, store all the template param lists. 4597 NewFD->setTemplateParameterListsInfo(Context, 4598 TemplateParamLists.size(), 4599 TemplateParamLists.release()); 4600 } 4601 4602 if (Invalid) { 4603 NewFD->setInvalidDecl(); 4604 if (FunctionTemplate) 4605 FunctionTemplate->setInvalidDecl(); 4606 } 4607 4608 // C++ [dcl.fct.spec]p5: 4609 // The virtual specifier shall only be used in declarations of 4610 // nonstatic class member functions that appear within a 4611 // member-specification of a class declaration; see 10.3. 4612 // 4613 if (isVirtual && !NewFD->isInvalidDecl()) { 4614 if (!isVirtualOkay) { 4615 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4616 diag::err_virtual_non_function); 4617 } else if (!CurContext->isRecord()) { 4618 // 'virtual' was specified outside of the class. 4619 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4620 diag::err_virtual_out_of_class) 4621 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4622 } else if (NewFD->getDescribedFunctionTemplate()) { 4623 // C++ [temp.mem]p3: 4624 // A member function template shall not be virtual. 4625 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4626 diag::err_virtual_member_function_template) 4627 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4628 } else { 4629 // Okay: Add virtual to the method. 4630 NewFD->setVirtualAsWritten(true); 4631 } 4632 } 4633 4634 // C++ [dcl.fct.spec]p3: 4635 // The inline specifier shall not appear on a block scope function declaration. 4636 if (isInline && !NewFD->isInvalidDecl()) { 4637 if (CurContext->isFunctionOrMethod()) { 4638 // 'inline' is not allowed on block scope function declaration. 4639 Diag(D.getDeclSpec().getInlineSpecLoc(), 4640 diag::err_inline_declaration_block_scope) << Name 4641 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4642 } 4643 } 4644 4645 // C++ [dcl.fct.spec]p6: 4646 // The explicit specifier shall be used only in the declaration of a 4647 // constructor or conversion function within its class definition; see 12.3.1 4648 // and 12.3.2. 4649 if (isExplicit && !NewFD->isInvalidDecl()) { 4650 if (!CurContext->isRecord()) { 4651 // 'explicit' was specified outside of the class. 4652 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4653 diag::err_explicit_out_of_class) 4654 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4655 } else if (!isa<CXXConstructorDecl>(NewFD) && 4656 !isa<CXXConversionDecl>(NewFD)) { 4657 // 'explicit' was specified on a function that wasn't a constructor 4658 // or conversion function. 4659 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4660 diag::err_explicit_non_ctor_or_conv_function) 4661 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4662 } 4663 } 4664 4665 if (isConstexpr) { 4666 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4667 // are implicitly inline. 4668 NewFD->setImplicitlyInline(); 4669 4670 // FIXME: If this is a redeclaration, check the original declaration was 4671 // marked constepr. 4672 4673 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4674 // be either constructors or to return a literal type. Therefore, 4675 // destructors cannot be declared constexpr. 4676 if (isa<CXXDestructorDecl>(NewFD)) 4677 Diag(D.getDeclSpec().getConstexprSpecLoc(), 4678 diag::err_constexpr_dtor); 4679 } 4680 4681 4682 // Filter out previous declarations that don't match the scope. 4683 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4684 isExplicitSpecialization || 4685 isFunctionTemplateSpecialization); 4686 4687 if (isFriend) { 4688 // For now, claim that the objects have no previous declaration. 4689 if (FunctionTemplate) { 4690 FunctionTemplate->setObjectOfFriendDecl(false); 4691 FunctionTemplate->setAccess(AS_public); 4692 } 4693 NewFD->setObjectOfFriendDecl(false); 4694 NewFD->setAccess(AS_public); 4695 } 4696 4697 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 4698 // A method is implicitly inline if it's defined in its class 4699 // definition. 4700 NewFD->setImplicitlyInline(); 4701 } 4702 4703 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4704 !CurContext->isRecord()) { 4705 // C++ [class.static]p1: 4706 // A data or function member of a class may be declared static 4707 // in a class definition, in which case it is a static member of 4708 // the class. 4709 4710 // Complain about the 'static' specifier if it's on an out-of-line 4711 // member function definition. 4712 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4713 diag::err_static_out_of_line) 4714 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4715 } 4716 } 4717 4718 // Handle GNU asm-label extension (encoded as an attribute). 4719 if (Expr *E = (Expr*) D.getAsmLabel()) { 4720 // The parser guarantees this is a string. 4721 StringLiteral *SE = cast<StringLiteral>(E); 4722 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 4723 SE->getString())); 4724 } 4725 4726 // Copy the parameter declarations from the declarator D to the function 4727 // declaration NewFD, if they are available. First scavenge them into Params. 4728 SmallVector<ParmVarDecl*, 16> Params; 4729 if (D.isFunctionDeclarator()) { 4730 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4731 4732 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 4733 // function that takes no arguments, not a function that takes a 4734 // single void argument. 4735 // We let through "const void" here because Sema::GetTypeForDeclarator 4736 // already checks for that case. 4737 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4738 FTI.ArgInfo[0].Param && 4739 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 4740 // Empty arg list, don't push any params. 4741 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 4742 4743 // In C++, the empty parameter-type-list must be spelled "void"; a 4744 // typedef of void is not permitted. 4745 if (getLangOptions().CPlusPlus && 4746 Param->getType().getUnqualifiedType() != Context.VoidTy) { 4747 bool IsTypeAlias = false; 4748 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 4749 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 4750 else if (const TemplateSpecializationType *TST = 4751 Param->getType()->getAs<TemplateSpecializationType>()) 4752 IsTypeAlias = TST->isTypeAlias(); 4753 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 4754 << IsTypeAlias; 4755 } 4756 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 4757 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 4758 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 4759 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 4760 Param->setDeclContext(NewFD); 4761 Params.push_back(Param); 4762 4763 if (Param->isInvalidDecl()) 4764 NewFD->setInvalidDecl(); 4765 } 4766 } 4767 4768 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 4769 // When we're declaring a function with a typedef, typeof, etc as in the 4770 // following example, we'll need to synthesize (unnamed) 4771 // parameters for use in the declaration. 4772 // 4773 // @code 4774 // typedef void fn(int); 4775 // fn f; 4776 // @endcode 4777 4778 // Synthesize a parameter for each argument type. 4779 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 4780 AE = FT->arg_type_end(); AI != AE; ++AI) { 4781 ParmVarDecl *Param = 4782 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 4783 Param->setScopeInfo(0, Params.size()); 4784 Params.push_back(Param); 4785 } 4786 } else { 4787 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 4788 "Should not need args for typedef of non-prototype fn"); 4789 } 4790 // Finally, we know we have the right number of parameters, install them. 4791 NewFD->setParams(Params.data(), Params.size()); 4792 4793 // Process the non-inheritable attributes on this declaration. 4794 ProcessDeclAttributes(S, NewFD, D, 4795 /*NonInheritable=*/true, /*Inheritable=*/false); 4796 4797 if (!getLangOptions().CPlusPlus) { 4798 // Perform semantic checking on the function declaration. 4799 bool isExplicitSpecialization=false; 4800 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4801 Redeclaration); 4802 assert((NewFD->isInvalidDecl() || !Redeclaration || 4803 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4804 "previous declaration set still overloaded"); 4805 } else { 4806 // If the declarator is a template-id, translate the parser's template 4807 // argument list into our AST format. 4808 bool HasExplicitTemplateArgs = false; 4809 TemplateArgumentListInfo TemplateArgs; 4810 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 4811 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 4812 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 4813 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 4814 ASTTemplateArgsPtr TemplateArgsPtr(*this, 4815 TemplateId->getTemplateArgs(), 4816 TemplateId->NumArgs); 4817 translateTemplateArguments(TemplateArgsPtr, 4818 TemplateArgs); 4819 TemplateArgsPtr.release(); 4820 4821 HasExplicitTemplateArgs = true; 4822 4823 if (NewFD->isInvalidDecl()) { 4824 HasExplicitTemplateArgs = false; 4825 } else if (FunctionTemplate) { 4826 // Function template with explicit template arguments. 4827 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 4828 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 4829 4830 HasExplicitTemplateArgs = false; 4831 } else if (!isFunctionTemplateSpecialization && 4832 !D.getDeclSpec().isFriendSpecified()) { 4833 // We have encountered something that the user meant to be a 4834 // specialization (because it has explicitly-specified template 4835 // arguments) but that was not introduced with a "template<>" (or had 4836 // too few of them). 4837 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 4838 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 4839 << FixItHint::CreateInsertion( 4840 D.getDeclSpec().getSourceRange().getBegin(), 4841 "template<> "); 4842 isFunctionTemplateSpecialization = true; 4843 } else { 4844 // "friend void foo<>(int);" is an implicit specialization decl. 4845 isFunctionTemplateSpecialization = true; 4846 } 4847 } else if (isFriend && isFunctionTemplateSpecialization) { 4848 // This combination is only possible in a recovery case; the user 4849 // wrote something like: 4850 // template <> friend void foo(int); 4851 // which we're recovering from as if the user had written: 4852 // friend void foo<>(int); 4853 // Go ahead and fake up a template id. 4854 HasExplicitTemplateArgs = true; 4855 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 4856 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 4857 } 4858 4859 // If it's a friend (and only if it's a friend), it's possible 4860 // that either the specialized function type or the specialized 4861 // template is dependent, and therefore matching will fail. In 4862 // this case, don't check the specialization yet. 4863 if (isFunctionTemplateSpecialization && isFriend && 4864 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 4865 assert(HasExplicitTemplateArgs && 4866 "friend function specialization without template args"); 4867 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 4868 Previous)) 4869 NewFD->setInvalidDecl(); 4870 } else if (isFunctionTemplateSpecialization) { 4871 if (CurContext->isDependentContext() && CurContext->isRecord() 4872 && !isFriend) { 4873 isDependentClassScopeExplicitSpecialization = true; 4874 Diag(NewFD->getLocation(), getLangOptions().Microsoft ? 4875 diag::ext_function_specialization_in_class : 4876 diag::err_function_specialization_in_class) 4877 << NewFD->getDeclName(); 4878 } else if (CheckFunctionTemplateSpecialization(NewFD, 4879 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 4880 Previous)) 4881 NewFD->setInvalidDecl(); 4882 4883 // C++ [dcl.stc]p1: 4884 // A storage-class-specifier shall not be specified in an explicit 4885 // specialization (14.7.3) 4886 if (SC != SC_None) { 4887 if (SC != NewFD->getStorageClass()) 4888 Diag(NewFD->getLocation(), 4889 diag::err_explicit_specialization_inconsistent_storage_class) 4890 << SC 4891 << FixItHint::CreateRemoval( 4892 D.getDeclSpec().getStorageClassSpecLoc()); 4893 4894 else 4895 Diag(NewFD->getLocation(), 4896 diag::ext_explicit_specialization_storage_class) 4897 << FixItHint::CreateRemoval( 4898 D.getDeclSpec().getStorageClassSpecLoc()); 4899 } 4900 4901 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 4902 if (CheckMemberSpecialization(NewFD, Previous)) 4903 NewFD->setInvalidDecl(); 4904 } 4905 4906 // Perform semantic checking on the function declaration. 4907 if (!isDependentClassScopeExplicitSpecialization) 4908 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4909 Redeclaration); 4910 4911 assert((NewFD->isInvalidDecl() || !Redeclaration || 4912 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4913 "previous declaration set still overloaded"); 4914 4915 NamedDecl *PrincipalDecl = (FunctionTemplate 4916 ? cast<NamedDecl>(FunctionTemplate) 4917 : NewFD); 4918 4919 if (isFriend && Redeclaration) { 4920 AccessSpecifier Access = AS_public; 4921 if (!NewFD->isInvalidDecl()) 4922 Access = NewFD->getPreviousDeclaration()->getAccess(); 4923 4924 NewFD->setAccess(Access); 4925 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 4926 4927 PrincipalDecl->setObjectOfFriendDecl(true); 4928 } 4929 4930 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 4931 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 4932 PrincipalDecl->setNonMemberOperator(); 4933 4934 // If we have a function template, check the template parameter 4935 // list. This will check and merge default template arguments. 4936 if (FunctionTemplate) { 4937 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 4938 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 4939 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 4940 D.getDeclSpec().isFriendSpecified() 4941 ? (IsFunctionDefinition 4942 ? TPC_FriendFunctionTemplateDefinition 4943 : TPC_FriendFunctionTemplate) 4944 : (D.getCXXScopeSpec().isSet() && 4945 DC && DC->isRecord() && 4946 DC->isDependentContext()) 4947 ? TPC_ClassTemplateMember 4948 : TPC_FunctionTemplate); 4949 } 4950 4951 if (NewFD->isInvalidDecl()) { 4952 // Ignore all the rest of this. 4953 } else if (!Redeclaration) { 4954 // Fake up an access specifier if it's supposed to be a class member. 4955 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 4956 NewFD->setAccess(AS_public); 4957 4958 // Qualified decls generally require a previous declaration. 4959 if (D.getCXXScopeSpec().isSet()) { 4960 // ...with the major exception of templated-scope or 4961 // dependent-scope friend declarations. 4962 4963 // TODO: we currently also suppress this check in dependent 4964 // contexts because (1) the parameter depth will be off when 4965 // matching friend templates and (2) we might actually be 4966 // selecting a friend based on a dependent factor. But there 4967 // are situations where these conditions don't apply and we 4968 // can actually do this check immediately. 4969 if (isFriend && 4970 (TemplateParamLists.size() || 4971 D.getCXXScopeSpec().getScopeRep()->isDependent() || 4972 CurContext->isDependentContext())) { 4973 // ignore these 4974 } else { 4975 // The user tried to provide an out-of-line definition for a 4976 // function that is a member of a class or namespace, but there 4977 // was no such member function declared (C++ [class.mfct]p2, 4978 // C++ [namespace.memdef]p2). For example: 4979 // 4980 // class X { 4981 // void f() const; 4982 // }; 4983 // 4984 // void X::f() { } // ill-formed 4985 // 4986 // Complain about this problem, and attempt to suggest close 4987 // matches (e.g., those that differ only in cv-qualifiers and 4988 // whether the parameter types are references). 4989 4990 DiagnoseInvalidRedeclaration(*this, NewFD, false); 4991 } 4992 4993 // Unqualified local friend declarations are required to resolve 4994 // to something. 4995 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 4996 DiagnoseInvalidRedeclaration(*this, NewFD, true); 4997 } 4998 4999 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 5000 !isFriend && !isFunctionTemplateSpecialization && 5001 !isExplicitSpecialization) { 5002 // An out-of-line member function declaration must also be a 5003 // definition (C++ [dcl.meaning]p1). 5004 // Note that this is not the case for explicit specializations of 5005 // function templates or member functions of class templates, per 5006 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 5007 // for compatibility with old SWIG code which likes to generate them. 5008 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5009 << D.getCXXScopeSpec().getRange(); 5010 } 5011 } 5012 5013 5014 // Handle attributes. We need to have merged decls when handling attributes 5015 // (for example to check for conflicts, etc). 5016 // FIXME: This needs to happen before we merge declarations. Then, 5017 // let attribute merging cope with attribute conflicts. 5018 ProcessDeclAttributes(S, NewFD, D, 5019 /*NonInheritable=*/false, /*Inheritable=*/true); 5020 5021 // attributes declared post-definition are currently ignored 5022 // FIXME: This should happen during attribute merging 5023 if (Redeclaration && Previous.isSingleResult()) { 5024 const FunctionDecl *Def; 5025 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5026 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5027 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5028 Diag(Def->getLocation(), diag::note_previous_definition); 5029 } 5030 } 5031 5032 AddKnownFunctionAttributes(NewFD); 5033 5034 if (NewFD->hasAttr<OverloadableAttr>() && 5035 !NewFD->getType()->getAs<FunctionProtoType>()) { 5036 Diag(NewFD->getLocation(), 5037 diag::err_attribute_overloadable_no_prototype) 5038 << NewFD; 5039 5040 // Turn this into a variadic function with no parameters. 5041 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5042 FunctionProtoType::ExtProtoInfo EPI; 5043 EPI.Variadic = true; 5044 EPI.ExtInfo = FT->getExtInfo(); 5045 5046 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5047 NewFD->setType(R); 5048 } 5049 5050 // If there's a #pragma GCC visibility in scope, and this isn't a class 5051 // member, set the visibility of this function. 5052 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5053 AddPushedVisibilityAttribute(NewFD); 5054 5055 // If this is a locally-scoped extern C function, update the 5056 // map of such names. 5057 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5058 && !NewFD->isInvalidDecl()) 5059 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5060 5061 // Set this FunctionDecl's range up to the right paren. 5062 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5063 5064 if (getLangOptions().CPlusPlus) { 5065 if (FunctionTemplate) { 5066 if (NewFD->isInvalidDecl()) 5067 FunctionTemplate->setInvalidDecl(); 5068 return FunctionTemplate; 5069 } 5070 } 5071 5072 MarkUnusedFileScopedDecl(NewFD); 5073 5074 if (getLangOptions().CUDA) 5075 if (IdentifierInfo *II = NewFD->getIdentifier()) 5076 if (!NewFD->isInvalidDecl() && 5077 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5078 if (II->isStr("cudaConfigureCall")) { 5079 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5080 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5081 5082 Context.setcudaConfigureCallDecl(NewFD); 5083 } 5084 } 5085 5086 // Here we have an function template explicit specialization at class scope. 5087 // The actually specialization will be postponed to template instatiation 5088 // time via the ClassScopeFunctionSpecializationDecl node. 5089 if (isDependentClassScopeExplicitSpecialization) { 5090 ClassScopeFunctionSpecializationDecl *NewSpec = 5091 ClassScopeFunctionSpecializationDecl::Create( 5092 Context, CurContext, SourceLocation(), 5093 cast<CXXMethodDecl>(NewFD)); 5094 CurContext->addDecl(NewSpec); 5095 AddToScope = false; 5096 } 5097 5098 return NewFD; 5099} 5100 5101/// \brief Perform semantic checking of a new function declaration. 5102/// 5103/// Performs semantic analysis of the new function declaration 5104/// NewFD. This routine performs all semantic checking that does not 5105/// require the actual declarator involved in the declaration, and is 5106/// used both for the declaration of functions as they are parsed 5107/// (called via ActOnDeclarator) and for the declaration of functions 5108/// that have been instantiated via C++ template instantiation (called 5109/// via InstantiateDecl). 5110/// 5111/// \param IsExplicitSpecialiation whether this new function declaration is 5112/// an explicit specialization of the previous declaration. 5113/// 5114/// This sets NewFD->isInvalidDecl() to true if there was an error. 5115void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5116 LookupResult &Previous, 5117 bool IsExplicitSpecialization, 5118 bool &Redeclaration) { 5119 // If NewFD is already known erroneous, don't do any of this checking. 5120 if (NewFD->isInvalidDecl()) { 5121 // If this is a class member, mark the class invalid immediately. 5122 // This avoids some consistency errors later. 5123 if (isa<CXXMethodDecl>(NewFD)) 5124 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl(); 5125 5126 return; 5127 } 5128 5129 if (NewFD->getResultType()->isVariablyModifiedType()) { 5130 // Functions returning a variably modified type violate C99 6.7.5.2p2 5131 // because all functions have linkage. 5132 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5133 return NewFD->setInvalidDecl(); 5134 } 5135 5136 if (NewFD->isMain()) 5137 CheckMain(NewFD); 5138 5139 // Check for a previous declaration of this name. 5140 if (Previous.empty() && NewFD->isExternC()) { 5141 // Since we did not find anything by this name and we're declaring 5142 // an extern "C" function, look for a non-visible extern "C" 5143 // declaration with the same name. 5144 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5145 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5146 if (Pos != LocallyScopedExternalDecls.end()) 5147 Previous.addDecl(Pos->second); 5148 } 5149 5150 // Merge or overload the declaration with an existing declaration of 5151 // the same name, if appropriate. 5152 if (!Previous.empty()) { 5153 // Determine whether NewFD is an overload of PrevDecl or 5154 // a declaration that requires merging. If it's an overload, 5155 // there's no more work to do here; we'll just add the new 5156 // function to the scope. 5157 5158 NamedDecl *OldDecl = 0; 5159 if (!AllowOverloadingOfFunction(Previous, Context)) { 5160 Redeclaration = true; 5161 OldDecl = Previous.getFoundDecl(); 5162 } else { 5163 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5164 /*NewIsUsingDecl*/ false)) { 5165 case Ovl_Match: 5166 Redeclaration = true; 5167 break; 5168 5169 case Ovl_NonFunction: 5170 Redeclaration = true; 5171 break; 5172 5173 case Ovl_Overload: 5174 Redeclaration = false; 5175 break; 5176 } 5177 5178 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5179 // If a function name is overloadable in C, then every function 5180 // with that name must be marked "overloadable". 5181 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5182 << Redeclaration << NewFD; 5183 NamedDecl *OverloadedDecl = 0; 5184 if (Redeclaration) 5185 OverloadedDecl = OldDecl; 5186 else if (!Previous.empty()) 5187 OverloadedDecl = Previous.getRepresentativeDecl(); 5188 if (OverloadedDecl) 5189 Diag(OverloadedDecl->getLocation(), 5190 diag::note_attribute_overloadable_prev_overload); 5191 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5192 Context)); 5193 } 5194 } 5195 5196 if (Redeclaration) { 5197 // NewFD and OldDecl represent declarations that need to be 5198 // merged. 5199 if (MergeFunctionDecl(NewFD, OldDecl)) 5200 return NewFD->setInvalidDecl(); 5201 5202 Previous.clear(); 5203 Previous.addDecl(OldDecl); 5204 5205 if (FunctionTemplateDecl *OldTemplateDecl 5206 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5207 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5208 FunctionTemplateDecl *NewTemplateDecl 5209 = NewFD->getDescribedFunctionTemplate(); 5210 assert(NewTemplateDecl && "Template/non-template mismatch"); 5211 if (CXXMethodDecl *Method 5212 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5213 Method->setAccess(OldTemplateDecl->getAccess()); 5214 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5215 } 5216 5217 // If this is an explicit specialization of a member that is a function 5218 // template, mark it as a member specialization. 5219 if (IsExplicitSpecialization && 5220 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5221 NewTemplateDecl->setMemberSpecialization(); 5222 assert(OldTemplateDecl->isMemberSpecialization()); 5223 } 5224 } else { 5225 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5226 NewFD->setAccess(OldDecl->getAccess()); 5227 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5228 } 5229 } 5230 } 5231 5232 // Semantic checking for this function declaration (in isolation). 5233 if (getLangOptions().CPlusPlus) { 5234 // C++-specific checks. 5235 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5236 CheckConstructor(Constructor); 5237 } else if (CXXDestructorDecl *Destructor = 5238 dyn_cast<CXXDestructorDecl>(NewFD)) { 5239 CXXRecordDecl *Record = Destructor->getParent(); 5240 QualType ClassType = Context.getTypeDeclType(Record); 5241 5242 // FIXME: Shouldn't we be able to perform this check even when the class 5243 // type is dependent? Both gcc and edg can handle that. 5244 if (!ClassType->isDependentType()) { 5245 DeclarationName Name 5246 = Context.DeclarationNames.getCXXDestructorName( 5247 Context.getCanonicalType(ClassType)); 5248 if (NewFD->getDeclName() != Name) { 5249 Diag(NewFD->getLocation(), diag::err_destructor_name); 5250 return NewFD->setInvalidDecl(); 5251 } 5252 } 5253 } else if (CXXConversionDecl *Conversion 5254 = dyn_cast<CXXConversionDecl>(NewFD)) { 5255 ActOnConversionDeclarator(Conversion); 5256 } 5257 5258 // Find any virtual functions that this function overrides. 5259 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5260 if (!Method->isFunctionTemplateSpecialization() && 5261 !Method->getDescribedFunctionTemplate()) { 5262 if (AddOverriddenMethods(Method->getParent(), Method)) { 5263 // If the function was marked as "static", we have a problem. 5264 if (NewFD->getStorageClass() == SC_Static) { 5265 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5266 << NewFD->getDeclName(); 5267 for (CXXMethodDecl::method_iterator 5268 Overridden = Method->begin_overridden_methods(), 5269 OverriddenEnd = Method->end_overridden_methods(); 5270 Overridden != OverriddenEnd; 5271 ++Overridden) { 5272 Diag((*Overridden)->getLocation(), 5273 diag::note_overridden_virtual_function); 5274 } 5275 } 5276 } 5277 } 5278 } 5279 5280 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5281 if (NewFD->isOverloadedOperator() && 5282 CheckOverloadedOperatorDeclaration(NewFD)) 5283 return NewFD->setInvalidDecl(); 5284 5285 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5286 if (NewFD->getLiteralIdentifier() && 5287 CheckLiteralOperatorDeclaration(NewFD)) 5288 return NewFD->setInvalidDecl(); 5289 5290 // In C++, check default arguments now that we have merged decls. Unless 5291 // the lexical context is the class, because in this case this is done 5292 // during delayed parsing anyway. 5293 if (!CurContext->isRecord()) 5294 CheckCXXDefaultArguments(NewFD); 5295 5296 // If this function declares a builtin function, check the type of this 5297 // declaration against the expected type for the builtin. 5298 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5299 ASTContext::GetBuiltinTypeError Error; 5300 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5301 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5302 // The type of this function differs from the type of the builtin, 5303 // so forget about the builtin entirely. 5304 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5305 } 5306 } 5307 } 5308} 5309 5310void Sema::CheckMain(FunctionDecl* FD) { 5311 // C++ [basic.start.main]p3: A program that declares main to be inline 5312 // or static is ill-formed. 5313 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5314 // shall not appear in a declaration of main. 5315 // static main is not an error under C99, but we should warn about it. 5316 bool isInline = FD->isInlineSpecified(); 5317 bool isStatic = FD->getStorageClass() == SC_Static; 5318 if (isInline || isStatic) { 5319 unsigned diagID = diag::warn_unusual_main_decl; 5320 if (isInline || getLangOptions().CPlusPlus) 5321 diagID = diag::err_unusual_main_decl; 5322 5323 int which = isStatic + (isInline << 1) - 1; 5324 Diag(FD->getLocation(), diagID) << which; 5325 } 5326 5327 QualType T = FD->getType(); 5328 assert(T->isFunctionType() && "function decl is not of function type"); 5329 const FunctionType* FT = T->getAs<FunctionType>(); 5330 5331 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5332 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5333 FD->setInvalidDecl(true); 5334 } 5335 5336 // Treat protoless main() as nullary. 5337 if (isa<FunctionNoProtoType>(FT)) return; 5338 5339 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5340 unsigned nparams = FTP->getNumArgs(); 5341 assert(FD->getNumParams() == nparams); 5342 5343 bool HasExtraParameters = (nparams > 3); 5344 5345 // Darwin passes an undocumented fourth argument of type char**. If 5346 // other platforms start sprouting these, the logic below will start 5347 // getting shifty. 5348 if (nparams == 4 && Context.Target.getTriple().isOSDarwin()) 5349 HasExtraParameters = false; 5350 5351 if (HasExtraParameters) { 5352 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5353 FD->setInvalidDecl(true); 5354 nparams = 3; 5355 } 5356 5357 // FIXME: a lot of the following diagnostics would be improved 5358 // if we had some location information about types. 5359 5360 QualType CharPP = 5361 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5362 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5363 5364 for (unsigned i = 0; i < nparams; ++i) { 5365 QualType AT = FTP->getArgType(i); 5366 5367 bool mismatch = true; 5368 5369 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5370 mismatch = false; 5371 else if (Expected[i] == CharPP) { 5372 // As an extension, the following forms are okay: 5373 // char const ** 5374 // char const * const * 5375 // char * const * 5376 5377 QualifierCollector qs; 5378 const PointerType* PT; 5379 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5380 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5381 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5382 qs.removeConst(); 5383 mismatch = !qs.empty(); 5384 } 5385 } 5386 5387 if (mismatch) { 5388 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5389 // TODO: suggest replacing given type with expected type 5390 FD->setInvalidDecl(true); 5391 } 5392 } 5393 5394 if (nparams == 1 && !FD->isInvalidDecl()) { 5395 Diag(FD->getLocation(), diag::warn_main_one_arg); 5396 } 5397 5398 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5399 Diag(FD->getLocation(), diag::err_main_template_decl); 5400 FD->setInvalidDecl(); 5401 } 5402} 5403 5404bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5405 // FIXME: Need strict checking. In C89, we need to check for 5406 // any assignment, increment, decrement, function-calls, or 5407 // commas outside of a sizeof. In C99, it's the same list, 5408 // except that the aforementioned are allowed in unevaluated 5409 // expressions. Everything else falls under the 5410 // "may accept other forms of constant expressions" exception. 5411 // (We never end up here for C++, so the constant expression 5412 // rules there don't matter.) 5413 if (Init->isConstantInitializer(Context, false)) 5414 return false; 5415 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5416 << Init->getSourceRange(); 5417 return true; 5418} 5419 5420namespace { 5421 // Visits an initialization expression to see if OrigDecl is evaluated in 5422 // its own initialization and throws a warning if it does. 5423 class SelfReferenceChecker 5424 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5425 Sema &S; 5426 Decl *OrigDecl; 5427 5428 public: 5429 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5430 5431 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5432 S(S), OrigDecl(OrigDecl) { } 5433 5434 void VisitExpr(Expr *E) { 5435 if (isa<ObjCMessageExpr>(*E)) return; 5436 Inherited::VisitExpr(E); 5437 } 5438 5439 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5440 CheckForSelfReference(E); 5441 Inherited::VisitImplicitCastExpr(E); 5442 } 5443 5444 void CheckForSelfReference(ImplicitCastExpr *E) { 5445 if (E->getCastKind() != CK_LValueToRValue) return; 5446 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5447 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr); 5448 if (!DRE) return; 5449 Decl* ReferenceDecl = DRE->getDecl(); 5450 if (OrigDecl != ReferenceDecl) return; 5451 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5452 Sema::NotForRedeclaration); 5453 S.DiagRuntimeBehavior(SubExpr->getLocStart(), SubExpr, 5454 S.PDiag(diag::warn_uninit_self_reference_in_init) 5455 << Result.getLookupName() 5456 << OrigDecl->getLocation() 5457 << SubExpr->getSourceRange()); 5458 } 5459 }; 5460} 5461 5462/// AddInitializerToDecl - Adds the initializer Init to the 5463/// declaration dcl. If DirectInit is true, this is C++ direct 5464/// initialization rather than copy initialization. 5465void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5466 bool DirectInit, bool TypeMayContainAuto) { 5467 // If there is no declaration, there was an error parsing it. Just ignore 5468 // the initializer. 5469 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5470 return; 5471 5472 // Check for self-references within variable initializers. 5473 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5474 // Variables declared within a function/method body are handled 5475 // by a dataflow analysis. 5476 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5477 SelfReferenceChecker(*this, RealDecl).VisitExpr(Init); 5478 } 5479 else { 5480 SelfReferenceChecker(*this, RealDecl).VisitExpr(Init); 5481 } 5482 5483 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5484 // With declarators parsed the way they are, the parser cannot 5485 // distinguish between a normal initializer and a pure-specifier. 5486 // Thus this grotesque test. 5487 IntegerLiteral *IL; 5488 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5489 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5490 CheckPureMethod(Method, Init->getSourceRange()); 5491 else { 5492 Diag(Method->getLocation(), diag::err_member_function_initialization) 5493 << Method->getDeclName() << Init->getSourceRange(); 5494 Method->setInvalidDecl(); 5495 } 5496 return; 5497 } 5498 5499 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5500 if (!VDecl) { 5501 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5502 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5503 RealDecl->setInvalidDecl(); 5504 return; 5505 } 5506 5507 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5508 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5509 TypeSourceInfo *DeducedType = 0; 5510 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5511 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5512 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5513 << Init->getSourceRange(); 5514 if (!DeducedType) { 5515 RealDecl->setInvalidDecl(); 5516 return; 5517 } 5518 VDecl->setTypeSourceInfo(DeducedType); 5519 VDecl->setType(DeducedType->getType()); 5520 5521 // In ARC, infer lifetime. 5522 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5523 VDecl->setInvalidDecl(); 5524 5525 // If this is a redeclaration, check that the type we just deduced matches 5526 // the previously declared type. 5527 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5528 MergeVarDeclTypes(VDecl, Old); 5529 } 5530 5531 5532 // A definition must end up with a complete type, which means it must be 5533 // complete with the restriction that an array type might be completed by the 5534 // initializer; note that later code assumes this restriction. 5535 QualType BaseDeclType = VDecl->getType(); 5536 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5537 BaseDeclType = Array->getElementType(); 5538 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5539 diag::err_typecheck_decl_incomplete_type)) { 5540 RealDecl->setInvalidDecl(); 5541 return; 5542 } 5543 5544 // The variable can not have an abstract class type. 5545 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5546 diag::err_abstract_type_in_decl, 5547 AbstractVariableType)) 5548 VDecl->setInvalidDecl(); 5549 5550 const VarDecl *Def; 5551 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5552 Diag(VDecl->getLocation(), diag::err_redefinition) 5553 << VDecl->getDeclName(); 5554 Diag(Def->getLocation(), diag::note_previous_definition); 5555 VDecl->setInvalidDecl(); 5556 return; 5557 } 5558 5559 const VarDecl* PrevInit = 0; 5560 if (getLangOptions().CPlusPlus) { 5561 // C++ [class.static.data]p4 5562 // If a static data member is of const integral or const 5563 // enumeration type, its declaration in the class definition can 5564 // specify a constant-initializer which shall be an integral 5565 // constant expression (5.19). In that case, the member can appear 5566 // in integral constant expressions. The member shall still be 5567 // defined in a namespace scope if it is used in the program and the 5568 // namespace scope definition shall not contain an initializer. 5569 // 5570 // We already performed a redefinition check above, but for static 5571 // data members we also need to check whether there was an in-class 5572 // declaration with an initializer. 5573 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5574 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5575 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5576 return; 5577 } 5578 5579 if (VDecl->hasLocalStorage()) 5580 getCurFunction()->setHasBranchProtectedScope(); 5581 5582 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5583 VDecl->setInvalidDecl(); 5584 return; 5585 } 5586 } 5587 5588 // Capture the variable that is being initialized and the style of 5589 // initialization. 5590 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5591 5592 // FIXME: Poor source location information. 5593 InitializationKind Kind 5594 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5595 Init->getLocStart(), 5596 Init->getLocEnd()) 5597 : InitializationKind::CreateCopy(VDecl->getLocation(), 5598 Init->getLocStart()); 5599 5600 // Get the decls type and save a reference for later, since 5601 // CheckInitializerTypes may change it. 5602 QualType DclT = VDecl->getType(), SavT = DclT; 5603 if (VDecl->isLocalVarDecl()) { 5604 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5605 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5606 VDecl->setInvalidDecl(); 5607 } else if (!VDecl->isInvalidDecl()) { 5608 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5609 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5610 MultiExprArg(*this, &Init, 1), 5611 &DclT); 5612 if (Result.isInvalid()) { 5613 VDecl->setInvalidDecl(); 5614 return; 5615 } 5616 5617 Init = Result.takeAs<Expr>(); 5618 5619 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5620 // Don't check invalid declarations to avoid emitting useless diagnostics. 5621 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5622 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 5623 CheckForConstantInitializer(Init, DclT); 5624 } 5625 } 5626 } else if (VDecl->isStaticDataMember() && 5627 VDecl->getLexicalDeclContext()->isRecord()) { 5628 // This is an in-class initialization for a static data member, e.g., 5629 // 5630 // struct S { 5631 // static const int value = 17; 5632 // }; 5633 5634 // Try to perform the initialization regardless. 5635 if (!VDecl->isInvalidDecl()) { 5636 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5637 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5638 MultiExprArg(*this, &Init, 1), 5639 &DclT); 5640 if (Result.isInvalid()) { 5641 VDecl->setInvalidDecl(); 5642 return; 5643 } 5644 5645 Init = Result.takeAs<Expr>(); 5646 } 5647 5648 // C++ [class.mem]p4: 5649 // A member-declarator can contain a constant-initializer only 5650 // if it declares a static member (9.4) of const integral or 5651 // const enumeration type, see 9.4.2. 5652 QualType T = VDecl->getType(); 5653 5654 // Do nothing on dependent types. 5655 if (T->isDependentType()) { 5656 5657 // Require constness. 5658 } else if (!T.isConstQualified()) { 5659 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 5660 << Init->getSourceRange(); 5661 VDecl->setInvalidDecl(); 5662 5663 // We allow integer constant expressions in all cases. 5664 } else if (T->isIntegralOrEnumerationType()) { 5665 // Check whether the expression is a constant expression. 5666 SourceLocation Loc; 5667 if (Init->isValueDependent()) 5668 ; // Nothing to check. 5669 else if (Init->isIntegerConstantExpr(Context, &Loc)) 5670 ; // Ok, it's an ICE! 5671 else if (Init->isEvaluatable(Context)) { 5672 // If we can constant fold the initializer through heroics, accept it, 5673 // but report this as a use of an extension for -pedantic. 5674 Diag(Loc, diag::ext_in_class_initializer_non_constant) 5675 << Init->getSourceRange(); 5676 } else { 5677 // Otherwise, this is some crazy unknown case. Report the issue at the 5678 // location provided by the isIntegerConstantExpr failed check. 5679 Diag(Loc, diag::err_in_class_initializer_non_constant) 5680 << Init->getSourceRange(); 5681 VDecl->setInvalidDecl(); 5682 } 5683 5684 // We allow floating-point constants as an extension in C++03, and 5685 // C++0x has far more complicated rules that we don't really 5686 // implement fully. 5687 } else { 5688 bool Allowed = false; 5689 if (getLangOptions().CPlusPlus0x) { 5690 Allowed = T->isLiteralType(); 5691 } else if (T->isFloatingType()) { // also permits complex, which is ok 5692 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 5693 << T << Init->getSourceRange(); 5694 Allowed = true; 5695 } 5696 5697 if (!Allowed) { 5698 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 5699 << T << Init->getSourceRange(); 5700 VDecl->setInvalidDecl(); 5701 5702 // TODO: there are probably expressions that pass here that shouldn't. 5703 } else if (!Init->isValueDependent() && 5704 !Init->isConstantInitializer(Context, false)) { 5705 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 5706 << Init->getSourceRange(); 5707 VDecl->setInvalidDecl(); 5708 } 5709 } 5710 } else if (VDecl->isFileVarDecl()) { 5711 if (VDecl->getStorageClassAsWritten() == SC_Extern && 5712 (!getLangOptions().CPlusPlus || 5713 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 5714 Diag(VDecl->getLocation(), diag::warn_extern_init); 5715 if (!VDecl->isInvalidDecl()) { 5716 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5717 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5718 MultiExprArg(*this, &Init, 1), 5719 &DclT); 5720 if (Result.isInvalid()) { 5721 VDecl->setInvalidDecl(); 5722 return; 5723 } 5724 5725 Init = Result.takeAs<Expr>(); 5726 } 5727 5728 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5729 // Don't check invalid declarations to avoid emitting useless diagnostics. 5730 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5731 // C99 6.7.8p4. All file scoped initializers need to be constant. 5732 CheckForConstantInitializer(Init, DclT); 5733 } 5734 } 5735 // If the type changed, it means we had an incomplete type that was 5736 // completed by the initializer. For example: 5737 // int ary[] = { 1, 3, 5 }; 5738 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 5739 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 5740 VDecl->setType(DclT); 5741 Init->setType(DclT); 5742 } 5743 5744 5745 // If this variable is a local declaration with record type, make sure it 5746 // doesn't have a flexible member initialization. We only support this as a 5747 // global/static definition. 5748 if (VDecl->hasLocalStorage()) 5749 if (const RecordType *RT = VDecl->getType()->getAs<RecordType>()) 5750 if (RT->getDecl()->hasFlexibleArrayMember()) { 5751 // Check whether the initializer tries to initialize the flexible 5752 // array member itself to anything other than an empty initializer list. 5753 if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) { 5754 unsigned Index = std::distance(RT->getDecl()->field_begin(), 5755 RT->getDecl()->field_end()) - 1; 5756 if (Index < ILE->getNumInits() && 5757 !(isa<InitListExpr>(ILE->getInit(Index)) && 5758 cast<InitListExpr>(ILE->getInit(Index))->getNumInits() == 0)) { 5759 Diag(VDecl->getLocation(), diag::err_nonstatic_flexible_variable); 5760 VDecl->setInvalidDecl(); 5761 } 5762 } 5763 } 5764 5765 // Check any implicit conversions within the expression. 5766 CheckImplicitConversions(Init, VDecl->getLocation()); 5767 5768 if (!VDecl->isInvalidDecl()) 5769 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 5770 5771 Init = MaybeCreateExprWithCleanups(Init); 5772 // Attach the initializer to the decl. 5773 VDecl->setInit(Init); 5774 5775 CheckCompleteVariableDeclaration(VDecl); 5776} 5777 5778/// ActOnInitializerError - Given that there was an error parsing an 5779/// initializer for the given declaration, try to return to some form 5780/// of sanity. 5781void Sema::ActOnInitializerError(Decl *D) { 5782 // Our main concern here is re-establishing invariants like "a 5783 // variable's type is either dependent or complete". 5784 if (!D || D->isInvalidDecl()) return; 5785 5786 VarDecl *VD = dyn_cast<VarDecl>(D); 5787 if (!VD) return; 5788 5789 // Auto types are meaningless if we can't make sense of the initializer. 5790 if (ParsingInitForAutoVars.count(D)) { 5791 D->setInvalidDecl(); 5792 return; 5793 } 5794 5795 QualType Ty = VD->getType(); 5796 if (Ty->isDependentType()) return; 5797 5798 // Require a complete type. 5799 if (RequireCompleteType(VD->getLocation(), 5800 Context.getBaseElementType(Ty), 5801 diag::err_typecheck_decl_incomplete_type)) { 5802 VD->setInvalidDecl(); 5803 return; 5804 } 5805 5806 // Require an abstract type. 5807 if (RequireNonAbstractType(VD->getLocation(), Ty, 5808 diag::err_abstract_type_in_decl, 5809 AbstractVariableType)) { 5810 VD->setInvalidDecl(); 5811 return; 5812 } 5813 5814 // Don't bother complaining about constructors or destructors, 5815 // though. 5816} 5817 5818void Sema::ActOnUninitializedDecl(Decl *RealDecl, 5819 bool TypeMayContainAuto) { 5820 // If there is no declaration, there was an error parsing it. Just ignore it. 5821 if (RealDecl == 0) 5822 return; 5823 5824 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 5825 QualType Type = Var->getType(); 5826 5827 // C++0x [dcl.spec.auto]p3 5828 if (TypeMayContainAuto && Type->getContainedAutoType()) { 5829 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 5830 << Var->getDeclName() << Type; 5831 Var->setInvalidDecl(); 5832 return; 5833 } 5834 5835 switch (Var->isThisDeclarationADefinition()) { 5836 case VarDecl::Definition: 5837 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 5838 break; 5839 5840 // We have an out-of-line definition of a static data member 5841 // that has an in-class initializer, so we type-check this like 5842 // a declaration. 5843 // 5844 // Fall through 5845 5846 case VarDecl::DeclarationOnly: 5847 // It's only a declaration. 5848 5849 // Block scope. C99 6.7p7: If an identifier for an object is 5850 // declared with no linkage (C99 6.2.2p6), the type for the 5851 // object shall be complete. 5852 if (!Type->isDependentType() && Var->isLocalVarDecl() && 5853 !Var->getLinkage() && !Var->isInvalidDecl() && 5854 RequireCompleteType(Var->getLocation(), Type, 5855 diag::err_typecheck_decl_incomplete_type)) 5856 Var->setInvalidDecl(); 5857 5858 // Make sure that the type is not abstract. 5859 if (!Type->isDependentType() && !Var->isInvalidDecl() && 5860 RequireNonAbstractType(Var->getLocation(), Type, 5861 diag::err_abstract_type_in_decl, 5862 AbstractVariableType)) 5863 Var->setInvalidDecl(); 5864 return; 5865 5866 case VarDecl::TentativeDefinition: 5867 // File scope. C99 6.9.2p2: A declaration of an identifier for an 5868 // object that has file scope without an initializer, and without a 5869 // storage-class specifier or with the storage-class specifier "static", 5870 // constitutes a tentative definition. Note: A tentative definition with 5871 // external linkage is valid (C99 6.2.2p5). 5872 if (!Var->isInvalidDecl()) { 5873 if (const IncompleteArrayType *ArrayT 5874 = Context.getAsIncompleteArrayType(Type)) { 5875 if (RequireCompleteType(Var->getLocation(), 5876 ArrayT->getElementType(), 5877 diag::err_illegal_decl_array_incomplete_type)) 5878 Var->setInvalidDecl(); 5879 } else if (Var->getStorageClass() == SC_Static) { 5880 // C99 6.9.2p3: If the declaration of an identifier for an object is 5881 // a tentative definition and has internal linkage (C99 6.2.2p3), the 5882 // declared type shall not be an incomplete type. 5883 // NOTE: code such as the following 5884 // static struct s; 5885 // struct s { int a; }; 5886 // is accepted by gcc. Hence here we issue a warning instead of 5887 // an error and we do not invalidate the static declaration. 5888 // NOTE: to avoid multiple warnings, only check the first declaration. 5889 if (Var->getPreviousDeclaration() == 0) 5890 RequireCompleteType(Var->getLocation(), Type, 5891 diag::ext_typecheck_decl_incomplete_type); 5892 } 5893 } 5894 5895 // Record the tentative definition; we're done. 5896 if (!Var->isInvalidDecl()) 5897 TentativeDefinitions.push_back(Var); 5898 return; 5899 } 5900 5901 // Provide a specific diagnostic for uninitialized variable 5902 // definitions with incomplete array type. 5903 if (Type->isIncompleteArrayType()) { 5904 Diag(Var->getLocation(), 5905 diag::err_typecheck_incomplete_array_needs_initializer); 5906 Var->setInvalidDecl(); 5907 return; 5908 } 5909 5910 // Provide a specific diagnostic for uninitialized variable 5911 // definitions with reference type. 5912 if (Type->isReferenceType()) { 5913 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 5914 << Var->getDeclName() 5915 << SourceRange(Var->getLocation(), Var->getLocation()); 5916 Var->setInvalidDecl(); 5917 return; 5918 } 5919 5920 // Do not attempt to type-check the default initializer for a 5921 // variable with dependent type. 5922 if (Type->isDependentType()) 5923 return; 5924 5925 if (Var->isInvalidDecl()) 5926 return; 5927 5928 if (RequireCompleteType(Var->getLocation(), 5929 Context.getBaseElementType(Type), 5930 diag::err_typecheck_decl_incomplete_type)) { 5931 Var->setInvalidDecl(); 5932 return; 5933 } 5934 5935 // The variable can not have an abstract class type. 5936 if (RequireNonAbstractType(Var->getLocation(), Type, 5937 diag::err_abstract_type_in_decl, 5938 AbstractVariableType)) { 5939 Var->setInvalidDecl(); 5940 return; 5941 } 5942 5943 // Check for jumps past the implicit initializer. C++0x 5944 // clarifies that this applies to a "variable with automatic 5945 // storage duration", not a "local variable". 5946 // C++0x [stmt.dcl]p3 5947 // A program that jumps from a point where a variable with automatic 5948 // storage duration is not in scope to a point where it is in scope is 5949 // ill-formed unless the variable has scalar type, class type with a 5950 // trivial default constructor and a trivial destructor, a cv-qualified 5951 // version of one of these types, or an array of one of the preceding 5952 // types and is declared without an initializer. 5953 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 5954 if (const RecordType *Record 5955 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 5956 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 5957 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) || 5958 (getLangOptions().CPlusPlus0x && 5959 (!CXXRecord->hasTrivialDefaultConstructor() || 5960 !CXXRecord->hasTrivialDestructor()))) 5961 getCurFunction()->setHasBranchProtectedScope(); 5962 } 5963 } 5964 5965 // C++03 [dcl.init]p9: 5966 // If no initializer is specified for an object, and the 5967 // object is of (possibly cv-qualified) non-POD class type (or 5968 // array thereof), the object shall be default-initialized; if 5969 // the object is of const-qualified type, the underlying class 5970 // type shall have a user-declared default 5971 // constructor. Otherwise, if no initializer is specified for 5972 // a non- static object, the object and its subobjects, if 5973 // any, have an indeterminate initial value); if the object 5974 // or any of its subobjects are of const-qualified type, the 5975 // program is ill-formed. 5976 // C++0x [dcl.init]p11: 5977 // If no initializer is specified for an object, the object is 5978 // default-initialized; [...]. 5979 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 5980 InitializationKind Kind 5981 = InitializationKind::CreateDefault(Var->getLocation()); 5982 5983 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 5984 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 5985 MultiExprArg(*this, 0, 0)); 5986 if (Init.isInvalid()) 5987 Var->setInvalidDecl(); 5988 else if (Init.get()) 5989 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 5990 5991 CheckCompleteVariableDeclaration(Var); 5992 } 5993} 5994 5995void Sema::ActOnCXXForRangeDecl(Decl *D) { 5996 VarDecl *VD = dyn_cast<VarDecl>(D); 5997 if (!VD) { 5998 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 5999 D->setInvalidDecl(); 6000 return; 6001 } 6002 6003 VD->setCXXForRangeDecl(true); 6004 6005 // for-range-declaration cannot be given a storage class specifier. 6006 int Error = -1; 6007 switch (VD->getStorageClassAsWritten()) { 6008 case SC_None: 6009 break; 6010 case SC_Extern: 6011 Error = 0; 6012 break; 6013 case SC_Static: 6014 Error = 1; 6015 break; 6016 case SC_PrivateExtern: 6017 Error = 2; 6018 break; 6019 case SC_Auto: 6020 Error = 3; 6021 break; 6022 case SC_Register: 6023 Error = 4; 6024 break; 6025 } 6026 // FIXME: constexpr isn't allowed here. 6027 //if (DS.isConstexprSpecified()) 6028 // Error = 5; 6029 if (Error != -1) { 6030 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6031 << VD->getDeclName() << Error; 6032 D->setInvalidDecl(); 6033 } 6034} 6035 6036void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6037 if (var->isInvalidDecl()) return; 6038 6039 // In ARC, don't allow jumps past the implicit initialization of a 6040 // local retaining variable. 6041 if (getLangOptions().ObjCAutoRefCount && 6042 var->hasLocalStorage()) { 6043 switch (var->getType().getObjCLifetime()) { 6044 case Qualifiers::OCL_None: 6045 case Qualifiers::OCL_ExplicitNone: 6046 case Qualifiers::OCL_Autoreleasing: 6047 break; 6048 6049 case Qualifiers::OCL_Weak: 6050 case Qualifiers::OCL_Strong: 6051 getCurFunction()->setHasBranchProtectedScope(); 6052 break; 6053 } 6054 } 6055 6056 // All the following checks are C++ only. 6057 if (!getLangOptions().CPlusPlus) return; 6058 6059 QualType baseType = Context.getBaseElementType(var->getType()); 6060 if (baseType->isDependentType()) return; 6061 6062 // __block variables might require us to capture a copy-initializer. 6063 if (var->hasAttr<BlocksAttr>()) { 6064 // It's currently invalid to ever have a __block variable with an 6065 // array type; should we diagnose that here? 6066 6067 // Regardless, we don't want to ignore array nesting when 6068 // constructing this copy. 6069 QualType type = var->getType(); 6070 6071 if (type->isStructureOrClassType()) { 6072 SourceLocation poi = var->getLocation(); 6073 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6074 ExprResult result = 6075 PerformCopyInitialization( 6076 InitializedEntity::InitializeBlock(poi, type, false), 6077 poi, Owned(varRef)); 6078 if (!result.isInvalid()) { 6079 result = MaybeCreateExprWithCleanups(result); 6080 Expr *init = result.takeAs<Expr>(); 6081 Context.setBlockVarCopyInits(var, init); 6082 } 6083 } 6084 } 6085 6086 // Check for global constructors. 6087 if (!var->getDeclContext()->isDependentContext() && 6088 var->hasGlobalStorage() && 6089 !var->isStaticLocal() && 6090 var->getInit() && 6091 !var->getInit()->isConstantInitializer(Context, 6092 baseType->isReferenceType())) 6093 Diag(var->getLocation(), diag::warn_global_constructor) 6094 << var->getInit()->getSourceRange(); 6095 6096 // Require the destructor. 6097 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6098 FinalizeVarWithDestructor(var, recordType); 6099} 6100 6101/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6102/// any semantic actions necessary after any initializer has been attached. 6103void 6104Sema::FinalizeDeclaration(Decl *ThisDecl) { 6105 // Note that we are no longer parsing the initializer for this declaration. 6106 ParsingInitForAutoVars.erase(ThisDecl); 6107} 6108 6109Sema::DeclGroupPtrTy 6110Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6111 Decl **Group, unsigned NumDecls) { 6112 SmallVector<Decl*, 8> Decls; 6113 6114 if (DS.isTypeSpecOwned()) 6115 Decls.push_back(DS.getRepAsDecl()); 6116 6117 for (unsigned i = 0; i != NumDecls; ++i) 6118 if (Decl *D = Group[i]) 6119 Decls.push_back(D); 6120 6121 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6122 DS.getTypeSpecType() == DeclSpec::TST_auto); 6123} 6124 6125/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6126/// group, performing any necessary semantic checking. 6127Sema::DeclGroupPtrTy 6128Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6129 bool TypeMayContainAuto) { 6130 // C++0x [dcl.spec.auto]p7: 6131 // If the type deduced for the template parameter U is not the same in each 6132 // deduction, the program is ill-formed. 6133 // FIXME: When initializer-list support is added, a distinction is needed 6134 // between the deduced type U and the deduced type which 'auto' stands for. 6135 // auto a = 0, b = { 1, 2, 3 }; 6136 // is legal because the deduced type U is 'int' in both cases. 6137 if (TypeMayContainAuto && NumDecls > 1) { 6138 QualType Deduced; 6139 CanQualType DeducedCanon; 6140 VarDecl *DeducedDecl = 0; 6141 for (unsigned i = 0; i != NumDecls; ++i) { 6142 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6143 AutoType *AT = D->getType()->getContainedAutoType(); 6144 // Don't reissue diagnostics when instantiating a template. 6145 if (AT && D->isInvalidDecl()) 6146 break; 6147 if (AT && AT->isDeduced()) { 6148 QualType U = AT->getDeducedType(); 6149 CanQualType UCanon = Context.getCanonicalType(U); 6150 if (Deduced.isNull()) { 6151 Deduced = U; 6152 DeducedCanon = UCanon; 6153 DeducedDecl = D; 6154 } else if (DeducedCanon != UCanon) { 6155 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6156 diag::err_auto_different_deductions) 6157 << Deduced << DeducedDecl->getDeclName() 6158 << U << D->getDeclName() 6159 << DeducedDecl->getInit()->getSourceRange() 6160 << D->getInit()->getSourceRange(); 6161 D->setInvalidDecl(); 6162 break; 6163 } 6164 } 6165 } 6166 } 6167 } 6168 6169 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6170} 6171 6172 6173/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6174/// to introduce parameters into function prototype scope. 6175Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6176 const DeclSpec &DS = D.getDeclSpec(); 6177 6178 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6179 VarDecl::StorageClass StorageClass = SC_None; 6180 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6181 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6182 StorageClass = SC_Register; 6183 StorageClassAsWritten = SC_Register; 6184 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6185 Diag(DS.getStorageClassSpecLoc(), 6186 diag::err_invalid_storage_class_in_func_decl); 6187 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6188 } 6189 6190 if (D.getDeclSpec().isThreadSpecified()) 6191 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6192 if (D.getDeclSpec().isConstexprSpecified()) 6193 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6194 << 0; 6195 6196 DiagnoseFunctionSpecifiers(D); 6197 6198 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6199 QualType parmDeclType = TInfo->getType(); 6200 6201 if (getLangOptions().CPlusPlus) { 6202 // Check that there are no default arguments inside the type of this 6203 // parameter. 6204 CheckExtraCXXDefaultArguments(D); 6205 6206 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6207 if (D.getCXXScopeSpec().isSet()) { 6208 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6209 << D.getCXXScopeSpec().getRange(); 6210 D.getCXXScopeSpec().clear(); 6211 } 6212 } 6213 6214 // Ensure we have a valid name 6215 IdentifierInfo *II = 0; 6216 if (D.hasName()) { 6217 II = D.getIdentifier(); 6218 if (!II) { 6219 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6220 << GetNameForDeclarator(D).getName().getAsString(); 6221 D.setInvalidType(true); 6222 } 6223 } 6224 6225 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6226 if (II) { 6227 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6228 ForRedeclaration); 6229 LookupName(R, S); 6230 if (R.isSingleResult()) { 6231 NamedDecl *PrevDecl = R.getFoundDecl(); 6232 if (PrevDecl->isTemplateParameter()) { 6233 // Maybe we will complain about the shadowed template parameter. 6234 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6235 // Just pretend that we didn't see the previous declaration. 6236 PrevDecl = 0; 6237 } else if (S->isDeclScope(PrevDecl)) { 6238 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6239 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6240 6241 // Recover by removing the name 6242 II = 0; 6243 D.SetIdentifier(0, D.getIdentifierLoc()); 6244 D.setInvalidType(true); 6245 } 6246 } 6247 } 6248 6249 // Temporarily put parameter variables in the translation unit, not 6250 // the enclosing context. This prevents them from accidentally 6251 // looking like class members in C++. 6252 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6253 D.getSourceRange().getBegin(), 6254 D.getIdentifierLoc(), II, 6255 parmDeclType, TInfo, 6256 StorageClass, StorageClassAsWritten); 6257 6258 if (D.isInvalidType()) 6259 New->setInvalidDecl(); 6260 6261 assert(S->isFunctionPrototypeScope()); 6262 assert(S->getFunctionPrototypeDepth() >= 1); 6263 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6264 S->getNextFunctionPrototypeIndex()); 6265 6266 // Add the parameter declaration into this scope. 6267 S->AddDecl(New); 6268 if (II) 6269 IdResolver.AddDecl(New); 6270 6271 ProcessDeclAttributes(S, New, D); 6272 6273 if (New->hasAttr<BlocksAttr>()) { 6274 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6275 } 6276 return New; 6277} 6278 6279/// \brief Synthesizes a variable for a parameter arising from a 6280/// typedef. 6281ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6282 SourceLocation Loc, 6283 QualType T) { 6284 /* FIXME: setting StartLoc == Loc. 6285 Would it be worth to modify callers so as to provide proper source 6286 location for the unnamed parameters, embedding the parameter's type? */ 6287 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6288 T, Context.getTrivialTypeSourceInfo(T, Loc), 6289 SC_None, SC_None, 0); 6290 Param->setImplicit(); 6291 return Param; 6292} 6293 6294void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6295 ParmVarDecl * const *ParamEnd) { 6296 // Don't diagnose unused-parameter errors in template instantiations; we 6297 // will already have done so in the template itself. 6298 if (!ActiveTemplateInstantiations.empty()) 6299 return; 6300 6301 for (; Param != ParamEnd; ++Param) { 6302 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6303 !(*Param)->hasAttr<UnusedAttr>()) { 6304 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6305 << (*Param)->getDeclName(); 6306 } 6307 } 6308} 6309 6310void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6311 ParmVarDecl * const *ParamEnd, 6312 QualType ReturnTy, 6313 NamedDecl *D) { 6314 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6315 return; 6316 6317 // Warn if the return value is pass-by-value and larger than the specified 6318 // threshold. 6319 if (ReturnTy.isPODType(Context)) { 6320 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6321 if (Size > LangOpts.NumLargeByValueCopy) 6322 Diag(D->getLocation(), diag::warn_return_value_size) 6323 << D->getDeclName() << Size; 6324 } 6325 6326 // Warn if any parameter is pass-by-value and larger than the specified 6327 // threshold. 6328 for (; Param != ParamEnd; ++Param) { 6329 QualType T = (*Param)->getType(); 6330 if (!T.isPODType(Context)) 6331 continue; 6332 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6333 if (Size > LangOpts.NumLargeByValueCopy) 6334 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6335 << (*Param)->getDeclName() << Size; 6336 } 6337} 6338 6339ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6340 SourceLocation NameLoc, IdentifierInfo *Name, 6341 QualType T, TypeSourceInfo *TSInfo, 6342 VarDecl::StorageClass StorageClass, 6343 VarDecl::StorageClass StorageClassAsWritten) { 6344 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6345 if (getLangOptions().ObjCAutoRefCount && 6346 T.getObjCLifetime() == Qualifiers::OCL_None && 6347 T->isObjCLifetimeType()) { 6348 6349 Qualifiers::ObjCLifetime lifetime; 6350 6351 // Special cases for arrays: 6352 // - if it's const, use __unsafe_unretained 6353 // - otherwise, it's an error 6354 if (T->isArrayType()) { 6355 if (!T.isConstQualified()) { 6356 Diag(NameLoc, diag::err_arc_array_param_no_ownership) 6357 << TSInfo->getTypeLoc().getSourceRange(); 6358 } 6359 lifetime = Qualifiers::OCL_ExplicitNone; 6360 } else { 6361 lifetime = T->getObjCARCImplicitLifetime(); 6362 } 6363 T = Context.getLifetimeQualifiedType(T, lifetime); 6364 } 6365 6366 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6367 Context.getAdjustedParameterType(T), 6368 TSInfo, 6369 StorageClass, StorageClassAsWritten, 6370 0); 6371 6372 // Parameters can not be abstract class types. 6373 // For record types, this is done by the AbstractClassUsageDiagnoser once 6374 // the class has been completely parsed. 6375 if (!CurContext->isRecord() && 6376 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6377 AbstractParamType)) 6378 New->setInvalidDecl(); 6379 6380 // Parameter declarators cannot be interface types. All ObjC objects are 6381 // passed by reference. 6382 if (T->isObjCObjectType()) { 6383 Diag(NameLoc, 6384 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6385 << FixItHint::CreateInsertion(NameLoc, "*"); 6386 T = Context.getObjCObjectPointerType(T); 6387 New->setType(T); 6388 } 6389 6390 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6391 // duration shall not be qualified by an address-space qualifier." 6392 // Since all parameters have automatic store duration, they can not have 6393 // an address space. 6394 if (T.getAddressSpace() != 0) { 6395 Diag(NameLoc, diag::err_arg_with_address_space); 6396 New->setInvalidDecl(); 6397 } 6398 6399 return New; 6400} 6401 6402void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6403 SourceLocation LocAfterDecls) { 6404 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6405 6406 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6407 // for a K&R function. 6408 if (!FTI.hasPrototype) { 6409 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6410 --i; 6411 if (FTI.ArgInfo[i].Param == 0) { 6412 llvm::SmallString<256> Code; 6413 llvm::raw_svector_ostream(Code) << " int " 6414 << FTI.ArgInfo[i].Ident->getName() 6415 << ";\n"; 6416 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6417 << FTI.ArgInfo[i].Ident 6418 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6419 6420 // Implicitly declare the argument as type 'int' for lack of a better 6421 // type. 6422 AttributeFactory attrs; 6423 DeclSpec DS(attrs); 6424 const char* PrevSpec; // unused 6425 unsigned DiagID; // unused 6426 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6427 PrevSpec, DiagID); 6428 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6429 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6430 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6431 } 6432 } 6433 } 6434} 6435 6436Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6437 Declarator &D) { 6438 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6439 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6440 Scope *ParentScope = FnBodyScope->getParent(); 6441 6442 Decl *DP = HandleDeclarator(ParentScope, D, 6443 MultiTemplateParamsArg(*this), 6444 /*IsFunctionDefinition=*/true); 6445 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6446} 6447 6448static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6449 // Don't warn about invalid declarations. 6450 if (FD->isInvalidDecl()) 6451 return false; 6452 6453 // Or declarations that aren't global. 6454 if (!FD->isGlobal()) 6455 return false; 6456 6457 // Don't warn about C++ member functions. 6458 if (isa<CXXMethodDecl>(FD)) 6459 return false; 6460 6461 // Don't warn about 'main'. 6462 if (FD->isMain()) 6463 return false; 6464 6465 // Don't warn about inline functions. 6466 if (FD->isInlined()) 6467 return false; 6468 6469 // Don't warn about function templates. 6470 if (FD->getDescribedFunctionTemplate()) 6471 return false; 6472 6473 // Don't warn about function template specializations. 6474 if (FD->isFunctionTemplateSpecialization()) 6475 return false; 6476 6477 bool MissingPrototype = true; 6478 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6479 Prev; Prev = Prev->getPreviousDeclaration()) { 6480 // Ignore any declarations that occur in function or method 6481 // scope, because they aren't visible from the header. 6482 if (Prev->getDeclContext()->isFunctionOrMethod()) 6483 continue; 6484 6485 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6486 break; 6487 } 6488 6489 return MissingPrototype; 6490} 6491 6492void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6493 // Don't complain if we're in GNU89 mode and the previous definition 6494 // was an extern inline function. 6495 const FunctionDecl *Definition; 6496 if (FD->isDefined(Definition) && 6497 !canRedefineFunction(Definition, getLangOptions())) { 6498 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6499 Definition->getStorageClass() == SC_Extern) 6500 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6501 << FD->getDeclName() << getLangOptions().CPlusPlus; 6502 else 6503 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6504 Diag(Definition->getLocation(), diag::note_previous_definition); 6505 } 6506} 6507 6508Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6509 // Clear the last template instantiation error context. 6510 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6511 6512 if (!D) 6513 return D; 6514 FunctionDecl *FD = 0; 6515 6516 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6517 FD = FunTmpl->getTemplatedDecl(); 6518 else 6519 FD = cast<FunctionDecl>(D); 6520 6521 // Enter a new function scope 6522 PushFunctionScope(); 6523 6524 // See if this is a redefinition. 6525 if (!FD->isLateTemplateParsed()) 6526 CheckForFunctionRedefinition(FD); 6527 6528 // Builtin functions cannot be defined. 6529 if (unsigned BuiltinID = FD->getBuiltinID()) { 6530 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6531 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6532 FD->setInvalidDecl(); 6533 } 6534 } 6535 6536 // The return type of a function definition must be complete 6537 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6538 QualType ResultType = FD->getResultType(); 6539 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6540 !FD->isInvalidDecl() && 6541 RequireCompleteType(FD->getLocation(), ResultType, 6542 diag::err_func_def_incomplete_result)) 6543 FD->setInvalidDecl(); 6544 6545 // GNU warning -Wmissing-prototypes: 6546 // Warn if a global function is defined without a previous 6547 // prototype declaration. This warning is issued even if the 6548 // definition itself provides a prototype. The aim is to detect 6549 // global functions that fail to be declared in header files. 6550 if (ShouldWarnAboutMissingPrototype(FD)) 6551 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6552 6553 if (FnBodyScope) 6554 PushDeclContext(FnBodyScope, FD); 6555 6556 // Check the validity of our function parameters 6557 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6558 /*CheckParameterNames=*/true); 6559 6560 // Introduce our parameters into the function scope 6561 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6562 ParmVarDecl *Param = FD->getParamDecl(p); 6563 Param->setOwningFunction(FD); 6564 6565 // If this has an identifier, add it to the scope stack. 6566 if (Param->getIdentifier() && FnBodyScope) { 6567 CheckShadow(FnBodyScope, Param); 6568 6569 PushOnScopeChains(Param, FnBodyScope); 6570 } 6571 } 6572 6573 // Checking attributes of current function definition 6574 // dllimport attribute. 6575 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6576 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6577 // dllimport attribute cannot be directly applied to definition. 6578 // Microsoft accepts dllimport for functions defined within class scope. 6579 if (!DA->isInherited() && 6580 !(LangOpts.Microsoft && FD->getLexicalDeclContext()->isRecord())) { 6581 Diag(FD->getLocation(), 6582 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6583 << "dllimport"; 6584 FD->setInvalidDecl(); 6585 return FD; 6586 } 6587 6588 // Visual C++ appears to not think this is an issue, so only issue 6589 // a warning when Microsoft extensions are disabled. 6590 if (!LangOpts.Microsoft) { 6591 // If a symbol previously declared dllimport is later defined, the 6592 // attribute is ignored in subsequent references, and a warning is 6593 // emitted. 6594 Diag(FD->getLocation(), 6595 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 6596 << FD->getName() << "dllimport"; 6597 } 6598 } 6599 return FD; 6600} 6601 6602/// \brief Given the set of return statements within a function body, 6603/// compute the variables that are subject to the named return value 6604/// optimization. 6605/// 6606/// Each of the variables that is subject to the named return value 6607/// optimization will be marked as NRVO variables in the AST, and any 6608/// return statement that has a marked NRVO variable as its NRVO candidate can 6609/// use the named return value optimization. 6610/// 6611/// This function applies a very simplistic algorithm for NRVO: if every return 6612/// statement in the function has the same NRVO candidate, that candidate is 6613/// the NRVO variable. 6614/// 6615/// FIXME: Employ a smarter algorithm that accounts for multiple return 6616/// statements and the lifetimes of the NRVO candidates. We should be able to 6617/// find a maximal set of NRVO variables. 6618static void ComputeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 6619 ReturnStmt **Returns = Scope->Returns.data(); 6620 6621 const VarDecl *NRVOCandidate = 0; 6622 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 6623 if (!Returns[I]->getNRVOCandidate()) 6624 return; 6625 6626 if (!NRVOCandidate) 6627 NRVOCandidate = Returns[I]->getNRVOCandidate(); 6628 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 6629 return; 6630 } 6631 6632 if (NRVOCandidate) 6633 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 6634} 6635 6636Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 6637 return ActOnFinishFunctionBody(D, move(BodyArg), false); 6638} 6639 6640Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 6641 bool IsInstantiation) { 6642 FunctionDecl *FD = 0; 6643 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 6644 if (FunTmpl) 6645 FD = FunTmpl->getTemplatedDecl(); 6646 else 6647 FD = dyn_cast_or_null<FunctionDecl>(dcl); 6648 6649 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 6650 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 6651 6652 if (FD) { 6653 FD->setBody(Body); 6654 if (FD->isMain()) { 6655 // C and C++ allow for main to automagically return 0. 6656 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6657 FD->setHasImplicitReturnZero(true); 6658 WP.disableCheckFallThrough(); 6659 } else if (FD->hasAttr<NakedAttr>()) { 6660 // If the function is marked 'naked', don't complain about missing return 6661 // statements. 6662 WP.disableCheckFallThrough(); 6663 } 6664 6665 // MSVC permits the use of pure specifier (=0) on function definition, 6666 // defined at class scope, warn about this non standard construct. 6667 if (getLangOptions().Microsoft && FD->isPure()) 6668 Diag(FD->getLocation(), diag::warn_pure_function_definition); 6669 6670 if (!FD->isInvalidDecl()) { 6671 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 6672 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 6673 FD->getResultType(), FD); 6674 6675 // If this is a constructor, we need a vtable. 6676 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 6677 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 6678 6679 ComputeNRVO(Body, getCurFunction()); 6680 } 6681 6682 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 6683 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 6684 assert(MD == getCurMethodDecl() && "Method parsing confused"); 6685 MD->setBody(Body); 6686 if (Body) 6687 MD->setEndLoc(Body->getLocEnd()); 6688 if (!MD->isInvalidDecl()) { 6689 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 6690 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 6691 MD->getResultType(), MD); 6692 } 6693 } else { 6694 return 0; 6695 } 6696 6697 // Verify and clean out per-function state. 6698 if (Body) { 6699 // C++ constructors that have function-try-blocks can't have return 6700 // statements in the handlers of that block. (C++ [except.handle]p14) 6701 // Verify this. 6702 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 6703 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 6704 6705 // Verify that gotos and switch cases don't jump into scopes illegally. 6706 if (getCurFunction()->NeedsScopeChecking() && 6707 !dcl->isInvalidDecl() && 6708 !hasAnyUnrecoverableErrorsInThisFunction()) 6709 DiagnoseInvalidJumps(Body); 6710 6711 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 6712 if (!Destructor->getParent()->isDependentType()) 6713 CheckDestructor(Destructor); 6714 6715 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6716 Destructor->getParent()); 6717 } 6718 6719 // If any errors have occurred, clear out any temporaries that may have 6720 // been leftover. This ensures that these temporaries won't be picked up for 6721 // deletion in some later function. 6722 if (PP.getDiagnostics().hasErrorOccurred() || 6723 PP.getDiagnostics().getSuppressAllDiagnostics()) { 6724 ExprTemporaries.clear(); 6725 ExprNeedsCleanups = false; 6726 } else if (!isa<FunctionTemplateDecl>(dcl)) { 6727 // Since the body is valid, issue any analysis-based warnings that are 6728 // enabled. 6729 ActivePolicy = &WP; 6730 } 6731 6732 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 6733 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 6734 } 6735 6736 if (!IsInstantiation) 6737 PopDeclContext(); 6738 6739 PopFunctionOrBlockScope(ActivePolicy, dcl); 6740 6741 // If any errors have occurred, clear out any temporaries that may have 6742 // been leftover. This ensures that these temporaries won't be picked up for 6743 // deletion in some later function. 6744 if (getDiagnostics().hasErrorOccurred()) { 6745 ExprTemporaries.clear(); 6746 ExprNeedsCleanups = false; 6747 } 6748 6749 return dcl; 6750} 6751 6752/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 6753/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 6754NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 6755 IdentifierInfo &II, Scope *S) { 6756 // Before we produce a declaration for an implicitly defined 6757 // function, see whether there was a locally-scoped declaration of 6758 // this name as a function or variable. If so, use that 6759 // (non-visible) declaration, and complain about it. 6760 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 6761 = findLocallyScopedExternalDecl(&II); 6762 if (Pos != LocallyScopedExternalDecls.end()) { 6763 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 6764 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 6765 return Pos->second; 6766 } 6767 6768 // Extension in C99. Legal in C90, but warn about it. 6769 if (II.getName().startswith("__builtin_")) 6770 Diag(Loc, diag::warn_builtin_unknown) << &II; 6771 else if (getLangOptions().C99) 6772 Diag(Loc, diag::ext_implicit_function_decl) << &II; 6773 else 6774 Diag(Loc, diag::warn_implicit_function_decl) << &II; 6775 6776 // Set a Declarator for the implicit definition: int foo(); 6777 const char *Dummy; 6778 AttributeFactory attrFactory; 6779 DeclSpec DS(attrFactory); 6780 unsigned DiagID; 6781 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 6782 (void)Error; // Silence warning. 6783 assert(!Error && "Error setting up implicit decl!"); 6784 Declarator D(DS, Declarator::BlockContext); 6785 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 6786 0, 0, true, SourceLocation(), 6787 SourceLocation(), 6788 EST_None, SourceLocation(), 6789 0, 0, 0, 0, Loc, Loc, D), 6790 DS.getAttributes(), 6791 SourceLocation()); 6792 D.SetIdentifier(&II, Loc); 6793 6794 // Insert this function into translation-unit scope. 6795 6796 DeclContext *PrevDC = CurContext; 6797 CurContext = Context.getTranslationUnitDecl(); 6798 6799 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 6800 FD->setImplicit(); 6801 6802 CurContext = PrevDC; 6803 6804 AddKnownFunctionAttributes(FD); 6805 6806 return FD; 6807} 6808 6809/// \brief Adds any function attributes that we know a priori based on 6810/// the declaration of this function. 6811/// 6812/// These attributes can apply both to implicitly-declared builtins 6813/// (like __builtin___printf_chk) or to library-declared functions 6814/// like NSLog or printf. 6815/// 6816/// We need to check for duplicate attributes both here and where user-written 6817/// attributes are applied to declarations. 6818void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 6819 if (FD->isInvalidDecl()) 6820 return; 6821 6822 // If this is a built-in function, map its builtin attributes to 6823 // actual attributes. 6824 if (unsigned BuiltinID = FD->getBuiltinID()) { 6825 // Handle printf-formatting attributes. 6826 unsigned FormatIdx; 6827 bool HasVAListArg; 6828 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 6829 if (!FD->getAttr<FormatAttr>()) 6830 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6831 "printf", FormatIdx+1, 6832 HasVAListArg ? 0 : FormatIdx+2)); 6833 } 6834 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 6835 HasVAListArg)) { 6836 if (!FD->getAttr<FormatAttr>()) 6837 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6838 "scanf", FormatIdx+1, 6839 HasVAListArg ? 0 : FormatIdx+2)); 6840 } 6841 6842 // Mark const if we don't care about errno and that is the only 6843 // thing preventing the function from being const. This allows 6844 // IRgen to use LLVM intrinsics for such functions. 6845 if (!getLangOptions().MathErrno && 6846 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 6847 if (!FD->getAttr<ConstAttr>()) 6848 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6849 } 6850 6851 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 6852 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 6853 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 6854 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6855 } 6856 6857 IdentifierInfo *Name = FD->getIdentifier(); 6858 if (!Name) 6859 return; 6860 if ((!getLangOptions().CPlusPlus && 6861 FD->getDeclContext()->isTranslationUnit()) || 6862 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 6863 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 6864 LinkageSpecDecl::lang_c)) { 6865 // Okay: this could be a libc/libm/Objective-C function we know 6866 // about. 6867 } else 6868 return; 6869 6870 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 6871 // FIXME: NSLog and NSLogv should be target specific 6872 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 6873 // FIXME: We known better than our headers. 6874 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 6875 } else 6876 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6877 "printf", 1, 6878 Name->isStr("NSLogv") ? 0 : 2)); 6879 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 6880 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 6881 // target-specific builtins, perhaps? 6882 if (!FD->getAttr<FormatAttr>()) 6883 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6884 "printf", 2, 6885 Name->isStr("vasprintf") ? 0 : 3)); 6886 } 6887} 6888 6889TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 6890 TypeSourceInfo *TInfo) { 6891 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 6892 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 6893 6894 if (!TInfo) { 6895 assert(D.isInvalidType() && "no declarator info for valid type"); 6896 TInfo = Context.getTrivialTypeSourceInfo(T); 6897 } 6898 6899 // Scope manipulation handled by caller. 6900 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 6901 D.getSourceRange().getBegin(), 6902 D.getIdentifierLoc(), 6903 D.getIdentifier(), 6904 TInfo); 6905 6906 // Bail out immediately if we have an invalid declaration. 6907 if (D.isInvalidType()) { 6908 NewTD->setInvalidDecl(); 6909 return NewTD; 6910 } 6911 6912 // C++ [dcl.typedef]p8: 6913 // If the typedef declaration defines an unnamed class (or 6914 // enum), the first typedef-name declared by the declaration 6915 // to be that class type (or enum type) is used to denote the 6916 // class type (or enum type) for linkage purposes only. 6917 // We need to check whether the type was declared in the declaration. 6918 switch (D.getDeclSpec().getTypeSpecType()) { 6919 case TST_enum: 6920 case TST_struct: 6921 case TST_union: 6922 case TST_class: { 6923 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 6924 6925 // Do nothing if the tag is not anonymous or already has an 6926 // associated typedef (from an earlier typedef in this decl group). 6927 if (tagFromDeclSpec->getIdentifier()) break; 6928 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 6929 6930 // A well-formed anonymous tag must always be a TUK_Definition. 6931 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 6932 6933 // The type must match the tag exactly; no qualifiers allowed. 6934 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 6935 break; 6936 6937 // Otherwise, set this is the anon-decl typedef for the tag. 6938 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 6939 break; 6940 } 6941 6942 default: 6943 break; 6944 } 6945 6946 return NewTD; 6947} 6948 6949 6950/// \brief Determine whether a tag with a given kind is acceptable 6951/// as a redeclaration of the given tag declaration. 6952/// 6953/// \returns true if the new tag kind is acceptable, false otherwise. 6954bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 6955 TagTypeKind NewTag, bool isDefinition, 6956 SourceLocation NewTagLoc, 6957 const IdentifierInfo &Name) { 6958 // C++ [dcl.type.elab]p3: 6959 // The class-key or enum keyword present in the 6960 // elaborated-type-specifier shall agree in kind with the 6961 // declaration to which the name in the elaborated-type-specifier 6962 // refers. This rule also applies to the form of 6963 // elaborated-type-specifier that declares a class-name or 6964 // friend class since it can be construed as referring to the 6965 // definition of the class. Thus, in any 6966 // elaborated-type-specifier, the enum keyword shall be used to 6967 // refer to an enumeration (7.2), the union class-key shall be 6968 // used to refer to a union (clause 9), and either the class or 6969 // struct class-key shall be used to refer to a class (clause 9) 6970 // declared using the class or struct class-key. 6971 TagTypeKind OldTag = Previous->getTagKind(); 6972 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 6973 if (OldTag == NewTag) 6974 return true; 6975 6976 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 6977 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 6978 // Warn about the struct/class tag mismatch. 6979 bool isTemplate = false; 6980 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 6981 isTemplate = Record->getDescribedClassTemplate(); 6982 6983 if (!ActiveTemplateInstantiations.empty()) { 6984 // In a template instantiation, do not offer fix-its for tag mismatches 6985 // since they usually mess up the template instead of fixing the problem. 6986 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 6987 << (NewTag == TTK_Class) << isTemplate << &Name; 6988 return true; 6989 } 6990 6991 if (isDefinition) { 6992 // On definitions, check previous tags and issue a fix-it for each 6993 // one that doesn't match the current tag. 6994 if (Previous->getDefinition()) { 6995 // Don't suggest fix-its for redefinitions. 6996 return true; 6997 } 6998 6999 bool previousMismatch = false; 7000 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7001 E(Previous->redecls_end()); I != E; ++I) { 7002 if (I->getTagKind() != NewTag) { 7003 if (!previousMismatch) { 7004 previousMismatch = true; 7005 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7006 << (NewTag == TTK_Class) << isTemplate << &Name; 7007 } 7008 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7009 << (NewTag == TTK_Class) 7010 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7011 NewTag == TTK_Class? 7012 "class" : "struct"); 7013 } 7014 } 7015 return true; 7016 } 7017 7018 // Check for a previous definition. If current tag and definition 7019 // are same type, do nothing. If no definition, but disagree with 7020 // with previous tag type, give a warning, but no fix-it. 7021 const TagDecl *Redecl = Previous->getDefinition() ? 7022 Previous->getDefinition() : Previous; 7023 if (Redecl->getTagKind() == NewTag) { 7024 return true; 7025 } 7026 7027 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7028 << (NewTag == TTK_Class) 7029 << isTemplate << &Name; 7030 Diag(Redecl->getLocation(), diag::note_previous_use); 7031 7032 // If there is a previous defintion, suggest a fix-it. 7033 if (Previous->getDefinition()) { 7034 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7035 << (Redecl->getTagKind() == TTK_Class) 7036 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7037 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7038 } 7039 7040 return true; 7041 } 7042 return false; 7043} 7044 7045/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7046/// former case, Name will be non-null. In the later case, Name will be null. 7047/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7048/// reference/declaration/definition of a tag. 7049Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7050 SourceLocation KWLoc, CXXScopeSpec &SS, 7051 IdentifierInfo *Name, SourceLocation NameLoc, 7052 AttributeList *Attr, AccessSpecifier AS, 7053 MultiTemplateParamsArg TemplateParameterLists, 7054 bool &OwnedDecl, bool &IsDependent, 7055 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7056 TypeResult UnderlyingType) { 7057 // If this is not a definition, it must have a name. 7058 assert((Name != 0 || TUK == TUK_Definition) && 7059 "Nameless record must be a definition!"); 7060 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7061 7062 OwnedDecl = false; 7063 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7064 7065 // FIXME: Check explicit specializations more carefully. 7066 bool isExplicitSpecialization = false; 7067 bool Invalid = false; 7068 7069 // We only need to do this matching if we have template parameters 7070 // or a scope specifier, which also conveniently avoids this work 7071 // for non-C++ cases. 7072 if (TemplateParameterLists.size() > 0 || 7073 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7074 if (TemplateParameterList *TemplateParams 7075 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7076 TemplateParameterLists.get(), 7077 TemplateParameterLists.size(), 7078 TUK == TUK_Friend, 7079 isExplicitSpecialization, 7080 Invalid)) { 7081 if (TemplateParams->size() > 0) { 7082 // This is a declaration or definition of a class template (which may 7083 // be a member of another template). 7084 7085 if (Invalid) 7086 return 0; 7087 7088 OwnedDecl = false; 7089 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7090 SS, Name, NameLoc, Attr, 7091 TemplateParams, AS, 7092 TemplateParameterLists.size() - 1, 7093 (TemplateParameterList**) TemplateParameterLists.release()); 7094 return Result.get(); 7095 } else { 7096 // The "template<>" header is extraneous. 7097 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7098 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7099 isExplicitSpecialization = true; 7100 } 7101 } 7102 } 7103 7104 // Figure out the underlying type if this a enum declaration. We need to do 7105 // this early, because it's needed to detect if this is an incompatible 7106 // redeclaration. 7107 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7108 7109 if (Kind == TTK_Enum) { 7110 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7111 // No underlying type explicitly specified, or we failed to parse the 7112 // type, default to int. 7113 EnumUnderlying = Context.IntTy.getTypePtr(); 7114 else if (UnderlyingType.get()) { 7115 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7116 // integral type; any cv-qualification is ignored. 7117 TypeSourceInfo *TI = 0; 7118 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7119 EnumUnderlying = TI; 7120 7121 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7122 7123 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7124 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7125 << T; 7126 // Recover by falling back to int. 7127 EnumUnderlying = Context.IntTy.getTypePtr(); 7128 } 7129 7130 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7131 UPPC_FixedUnderlyingType)) 7132 EnumUnderlying = Context.IntTy.getTypePtr(); 7133 7134 } else if (getLangOptions().Microsoft) 7135 // Microsoft enums are always of int type. 7136 EnumUnderlying = Context.IntTy.getTypePtr(); 7137 } 7138 7139 DeclContext *SearchDC = CurContext; 7140 DeclContext *DC = CurContext; 7141 bool isStdBadAlloc = false; 7142 7143 RedeclarationKind Redecl = ForRedeclaration; 7144 if (TUK == TUK_Friend || TUK == TUK_Reference) 7145 Redecl = NotForRedeclaration; 7146 7147 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7148 7149 if (Name && SS.isNotEmpty()) { 7150 // We have a nested-name tag ('struct foo::bar'). 7151 7152 // Check for invalid 'foo::'. 7153 if (SS.isInvalid()) { 7154 Name = 0; 7155 goto CreateNewDecl; 7156 } 7157 7158 // If this is a friend or a reference to a class in a dependent 7159 // context, don't try to make a decl for it. 7160 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7161 DC = computeDeclContext(SS, false); 7162 if (!DC) { 7163 IsDependent = true; 7164 return 0; 7165 } 7166 } else { 7167 DC = computeDeclContext(SS, true); 7168 if (!DC) { 7169 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7170 << SS.getRange(); 7171 return 0; 7172 } 7173 } 7174 7175 if (RequireCompleteDeclContext(SS, DC)) 7176 return 0; 7177 7178 SearchDC = DC; 7179 // Look-up name inside 'foo::'. 7180 LookupQualifiedName(Previous, DC); 7181 7182 if (Previous.isAmbiguous()) 7183 return 0; 7184 7185 if (Previous.empty()) { 7186 // Name lookup did not find anything. However, if the 7187 // nested-name-specifier refers to the current instantiation, 7188 // and that current instantiation has any dependent base 7189 // classes, we might find something at instantiation time: treat 7190 // this as a dependent elaborated-type-specifier. 7191 // But this only makes any sense for reference-like lookups. 7192 if (Previous.wasNotFoundInCurrentInstantiation() && 7193 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7194 IsDependent = true; 7195 return 0; 7196 } 7197 7198 // A tag 'foo::bar' must already exist. 7199 Diag(NameLoc, diag::err_not_tag_in_scope) 7200 << Kind << Name << DC << SS.getRange(); 7201 Name = 0; 7202 Invalid = true; 7203 goto CreateNewDecl; 7204 } 7205 } else if (Name) { 7206 // If this is a named struct, check to see if there was a previous forward 7207 // declaration or definition. 7208 // FIXME: We're looking into outer scopes here, even when we 7209 // shouldn't be. Doing so can result in ambiguities that we 7210 // shouldn't be diagnosing. 7211 LookupName(Previous, S); 7212 7213 if (Previous.isAmbiguous() && 7214 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7215 LookupResult::Filter F = Previous.makeFilter(); 7216 while (F.hasNext()) { 7217 NamedDecl *ND = F.next(); 7218 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7219 F.erase(); 7220 } 7221 F.done(); 7222 } 7223 7224 // Note: there used to be some attempt at recovery here. 7225 if (Previous.isAmbiguous()) 7226 return 0; 7227 7228 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7229 // FIXME: This makes sure that we ignore the contexts associated 7230 // with C structs, unions, and enums when looking for a matching 7231 // tag declaration or definition. See the similar lookup tweak 7232 // in Sema::LookupName; is there a better way to deal with this? 7233 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7234 SearchDC = SearchDC->getParent(); 7235 } 7236 } else if (S->isFunctionPrototypeScope()) { 7237 // If this is an enum declaration in function prototype scope, set its 7238 // initial context to the translation unit. 7239 SearchDC = Context.getTranslationUnitDecl(); 7240 } 7241 7242 if (Previous.isSingleResult() && 7243 Previous.getFoundDecl()->isTemplateParameter()) { 7244 // Maybe we will complain about the shadowed template parameter. 7245 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7246 // Just pretend that we didn't see the previous declaration. 7247 Previous.clear(); 7248 } 7249 7250 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7251 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7252 // This is a declaration of or a reference to "std::bad_alloc". 7253 isStdBadAlloc = true; 7254 7255 if (Previous.empty() && StdBadAlloc) { 7256 // std::bad_alloc has been implicitly declared (but made invisible to 7257 // name lookup). Fill in this implicit declaration as the previous 7258 // declaration, so that the declarations get chained appropriately. 7259 Previous.addDecl(getStdBadAlloc()); 7260 } 7261 } 7262 7263 // If we didn't find a previous declaration, and this is a reference 7264 // (or friend reference), move to the correct scope. In C++, we 7265 // also need to do a redeclaration lookup there, just in case 7266 // there's a shadow friend decl. 7267 if (Name && Previous.empty() && 7268 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7269 if (Invalid) goto CreateNewDecl; 7270 assert(SS.isEmpty()); 7271 7272 if (TUK == TUK_Reference) { 7273 // C++ [basic.scope.pdecl]p5: 7274 // -- for an elaborated-type-specifier of the form 7275 // 7276 // class-key identifier 7277 // 7278 // if the elaborated-type-specifier is used in the 7279 // decl-specifier-seq or parameter-declaration-clause of a 7280 // function defined in namespace scope, the identifier is 7281 // declared as a class-name in the namespace that contains 7282 // the declaration; otherwise, except as a friend 7283 // declaration, the identifier is declared in the smallest 7284 // non-class, non-function-prototype scope that contains the 7285 // declaration. 7286 // 7287 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7288 // C structs and unions. 7289 // 7290 // It is an error in C++ to declare (rather than define) an enum 7291 // type, including via an elaborated type specifier. We'll 7292 // diagnose that later; for now, declare the enum in the same 7293 // scope as we would have picked for any other tag type. 7294 // 7295 // GNU C also supports this behavior as part of its incomplete 7296 // enum types extension, while GNU C++ does not. 7297 // 7298 // Find the context where we'll be declaring the tag. 7299 // FIXME: We would like to maintain the current DeclContext as the 7300 // lexical context, 7301 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7302 SearchDC = SearchDC->getParent(); 7303 7304 // Find the scope where we'll be declaring the tag. 7305 while (S->isClassScope() || 7306 (getLangOptions().CPlusPlus && 7307 S->isFunctionPrototypeScope()) || 7308 ((S->getFlags() & Scope::DeclScope) == 0) || 7309 (S->getEntity() && 7310 ((DeclContext *)S->getEntity())->isTransparentContext())) 7311 S = S->getParent(); 7312 } else { 7313 assert(TUK == TUK_Friend); 7314 // C++ [namespace.memdef]p3: 7315 // If a friend declaration in a non-local class first declares a 7316 // class or function, the friend class or function is a member of 7317 // the innermost enclosing namespace. 7318 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7319 } 7320 7321 // In C++, we need to do a redeclaration lookup to properly 7322 // diagnose some problems. 7323 if (getLangOptions().CPlusPlus) { 7324 Previous.setRedeclarationKind(ForRedeclaration); 7325 LookupQualifiedName(Previous, SearchDC); 7326 } 7327 } 7328 7329 if (!Previous.empty()) { 7330 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7331 7332 // It's okay to have a tag decl in the same scope as a typedef 7333 // which hides a tag decl in the same scope. Finding this 7334 // insanity with a redeclaration lookup can only actually happen 7335 // in C++. 7336 // 7337 // This is also okay for elaborated-type-specifiers, which is 7338 // technically forbidden by the current standard but which is 7339 // okay according to the likely resolution of an open issue; 7340 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7341 if (getLangOptions().CPlusPlus) { 7342 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7343 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7344 TagDecl *Tag = TT->getDecl(); 7345 if (Tag->getDeclName() == Name && 7346 Tag->getDeclContext()->getRedeclContext() 7347 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7348 PrevDecl = Tag; 7349 Previous.clear(); 7350 Previous.addDecl(Tag); 7351 Previous.resolveKind(); 7352 } 7353 } 7354 } 7355 } 7356 7357 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7358 // If this is a use of a previous tag, or if the tag is already declared 7359 // in the same scope (so that the definition/declaration completes or 7360 // rementions the tag), reuse the decl. 7361 if (TUK == TUK_Reference || TUK == TUK_Friend || 7362 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7363 // Make sure that this wasn't declared as an enum and now used as a 7364 // struct or something similar. 7365 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7366 TUK == TUK_Definition, KWLoc, 7367 *Name)) { 7368 bool SafeToContinue 7369 = (PrevTagDecl->getTagKind() != TTK_Enum && 7370 Kind != TTK_Enum); 7371 if (SafeToContinue) 7372 Diag(KWLoc, diag::err_use_with_wrong_tag) 7373 << Name 7374 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7375 PrevTagDecl->getKindName()); 7376 else 7377 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7378 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7379 7380 if (SafeToContinue) 7381 Kind = PrevTagDecl->getTagKind(); 7382 else { 7383 // Recover by making this an anonymous redefinition. 7384 Name = 0; 7385 Previous.clear(); 7386 Invalid = true; 7387 } 7388 } 7389 7390 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7391 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7392 7393 // All conflicts with previous declarations are recovered by 7394 // returning the previous declaration. 7395 if (ScopedEnum != PrevEnum->isScoped()) { 7396 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7397 << PrevEnum->isScoped(); 7398 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7399 return PrevTagDecl; 7400 } 7401 else if (EnumUnderlying && PrevEnum->isFixed()) { 7402 QualType T; 7403 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7404 T = TI->getType(); 7405 else 7406 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7407 7408 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 7409 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7410 diag::err_enum_redeclare_type_mismatch) 7411 << T 7412 << PrevEnum->getIntegerType(); 7413 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7414 return PrevTagDecl; 7415 } 7416 } 7417 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7418 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7419 << PrevEnum->isFixed(); 7420 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7421 return PrevTagDecl; 7422 } 7423 } 7424 7425 if (!Invalid) { 7426 // If this is a use, just return the declaration we found. 7427 7428 // FIXME: In the future, return a variant or some other clue 7429 // for the consumer of this Decl to know it doesn't own it. 7430 // For our current ASTs this shouldn't be a problem, but will 7431 // need to be changed with DeclGroups. 7432 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7433 getLangOptions().Microsoft)) || TUK == TUK_Friend) 7434 return PrevTagDecl; 7435 7436 // Diagnose attempts to redefine a tag. 7437 if (TUK == TUK_Definition) { 7438 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7439 // If we're defining a specialization and the previous definition 7440 // is from an implicit instantiation, don't emit an error 7441 // here; we'll catch this in the general case below. 7442 if (!isExplicitSpecialization || 7443 !isa<CXXRecordDecl>(Def) || 7444 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7445 == TSK_ExplicitSpecialization) { 7446 Diag(NameLoc, diag::err_redefinition) << Name; 7447 Diag(Def->getLocation(), diag::note_previous_definition); 7448 // If this is a redefinition, recover by making this 7449 // struct be anonymous, which will make any later 7450 // references get the previous definition. 7451 Name = 0; 7452 Previous.clear(); 7453 Invalid = true; 7454 } 7455 } else { 7456 // If the type is currently being defined, complain 7457 // about a nested redefinition. 7458 const TagType *Tag 7459 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7460 if (Tag->isBeingDefined()) { 7461 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7462 Diag(PrevTagDecl->getLocation(), 7463 diag::note_previous_definition); 7464 Name = 0; 7465 Previous.clear(); 7466 Invalid = true; 7467 } 7468 } 7469 7470 // Okay, this is definition of a previously declared or referenced 7471 // tag PrevDecl. We're going to create a new Decl for it. 7472 } 7473 } 7474 // If we get here we have (another) forward declaration or we 7475 // have a definition. Just create a new decl. 7476 7477 } else { 7478 // If we get here, this is a definition of a new tag type in a nested 7479 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7480 // new decl/type. We set PrevDecl to NULL so that the entities 7481 // have distinct types. 7482 Previous.clear(); 7483 } 7484 // If we get here, we're going to create a new Decl. If PrevDecl 7485 // is non-NULL, it's a definition of the tag declared by 7486 // PrevDecl. If it's NULL, we have a new definition. 7487 7488 7489 // Otherwise, PrevDecl is not a tag, but was found with tag 7490 // lookup. This is only actually possible in C++, where a few 7491 // things like templates still live in the tag namespace. 7492 } else { 7493 assert(getLangOptions().CPlusPlus); 7494 7495 // Use a better diagnostic if an elaborated-type-specifier 7496 // found the wrong kind of type on the first 7497 // (non-redeclaration) lookup. 7498 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7499 !Previous.isForRedeclaration()) { 7500 unsigned Kind = 0; 7501 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7502 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7503 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7504 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7505 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7506 Invalid = true; 7507 7508 // Otherwise, only diagnose if the declaration is in scope. 7509 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7510 isExplicitSpecialization)) { 7511 // do nothing 7512 7513 // Diagnose implicit declarations introduced by elaborated types. 7514 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7515 unsigned Kind = 0; 7516 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7517 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7518 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7519 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7520 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7521 Invalid = true; 7522 7523 // Otherwise it's a declaration. Call out a particularly common 7524 // case here. 7525 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7526 unsigned Kind = 0; 7527 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7528 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7529 << Name << Kind << TND->getUnderlyingType(); 7530 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7531 Invalid = true; 7532 7533 // Otherwise, diagnose. 7534 } else { 7535 // The tag name clashes with something else in the target scope, 7536 // issue an error and recover by making this tag be anonymous. 7537 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7538 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7539 Name = 0; 7540 Invalid = true; 7541 } 7542 7543 // The existing declaration isn't relevant to us; we're in a 7544 // new scope, so clear out the previous declaration. 7545 Previous.clear(); 7546 } 7547 } 7548 7549CreateNewDecl: 7550 7551 TagDecl *PrevDecl = 0; 7552 if (Previous.isSingleResult()) 7553 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 7554 7555 // If there is an identifier, use the location of the identifier as the 7556 // location of the decl, otherwise use the location of the struct/union 7557 // keyword. 7558 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 7559 7560 // Otherwise, create a new declaration. If there is a previous 7561 // declaration of the same entity, the two will be linked via 7562 // PrevDecl. 7563 TagDecl *New; 7564 7565 bool IsForwardReference = false; 7566 if (Kind == TTK_Enum) { 7567 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7568 // enum X { A, B, C } D; D should chain to X. 7569 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 7570 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 7571 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 7572 // If this is an undefined enum, warn. 7573 if (TUK != TUK_Definition && !Invalid) { 7574 TagDecl *Def; 7575 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 7576 // C++0x: 7.2p2: opaque-enum-declaration. 7577 // Conflicts are diagnosed above. Do nothing. 7578 } 7579 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 7580 Diag(Loc, diag::ext_forward_ref_enum_def) 7581 << New; 7582 Diag(Def->getLocation(), diag::note_previous_definition); 7583 } else { 7584 unsigned DiagID = diag::ext_forward_ref_enum; 7585 if (getLangOptions().Microsoft) 7586 DiagID = diag::ext_ms_forward_ref_enum; 7587 else if (getLangOptions().CPlusPlus) 7588 DiagID = diag::err_forward_ref_enum; 7589 Diag(Loc, DiagID); 7590 7591 // If this is a forward-declared reference to an enumeration, make a 7592 // note of it; we won't actually be introducing the declaration into 7593 // the declaration context. 7594 if (TUK == TUK_Reference) 7595 IsForwardReference = true; 7596 } 7597 } 7598 7599 if (EnumUnderlying) { 7600 EnumDecl *ED = cast<EnumDecl>(New); 7601 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7602 ED->setIntegerTypeSourceInfo(TI); 7603 else 7604 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 7605 ED->setPromotionType(ED->getIntegerType()); 7606 } 7607 7608 } else { 7609 // struct/union/class 7610 7611 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7612 // struct X { int A; } D; D should chain to X. 7613 if (getLangOptions().CPlusPlus) { 7614 // FIXME: Look for a way to use RecordDecl for simple structs. 7615 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7616 cast_or_null<CXXRecordDecl>(PrevDecl)); 7617 7618 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 7619 StdBadAlloc = cast<CXXRecordDecl>(New); 7620 } else 7621 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7622 cast_or_null<RecordDecl>(PrevDecl)); 7623 } 7624 7625 // Maybe add qualifier info. 7626 if (SS.isNotEmpty()) { 7627 if (SS.isSet()) { 7628 New->setQualifierInfo(SS.getWithLocInContext(Context)); 7629 if (TemplateParameterLists.size() > 0) { 7630 New->setTemplateParameterListsInfo(Context, 7631 TemplateParameterLists.size(), 7632 (TemplateParameterList**) TemplateParameterLists.release()); 7633 } 7634 } 7635 else 7636 Invalid = true; 7637 } 7638 7639 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 7640 // Add alignment attributes if necessary; these attributes are checked when 7641 // the ASTContext lays out the structure. 7642 // 7643 // It is important for implementing the correct semantics that this 7644 // happen here (in act on tag decl). The #pragma pack stack is 7645 // maintained as a result of parser callbacks which can occur at 7646 // many points during the parsing of a struct declaration (because 7647 // the #pragma tokens are effectively skipped over during the 7648 // parsing of the struct). 7649 AddAlignmentAttributesForRecord(RD); 7650 7651 AddMsStructLayoutForRecord(RD); 7652 } 7653 7654 // If this is a specialization of a member class (of a class template), 7655 // check the specialization. 7656 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 7657 Invalid = true; 7658 7659 if (Invalid) 7660 New->setInvalidDecl(); 7661 7662 if (Attr) 7663 ProcessDeclAttributeList(S, New, Attr); 7664 7665 // If we're declaring or defining a tag in function prototype scope 7666 // in C, note that this type can only be used within the function. 7667 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 7668 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 7669 7670 // Set the lexical context. If the tag has a C++ scope specifier, the 7671 // lexical context will be different from the semantic context. 7672 New->setLexicalDeclContext(CurContext); 7673 7674 // Mark this as a friend decl if applicable. 7675 // In Microsoft mode, a friend declaration also acts as a forward 7676 // declaration so we always pass true to setObjectOfFriendDecl to make 7677 // the tag name visible. 7678 if (TUK == TUK_Friend) 7679 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 7680 getLangOptions().Microsoft); 7681 7682 // Set the access specifier. 7683 if (!Invalid && SearchDC->isRecord()) 7684 SetMemberAccessSpecifier(New, PrevDecl, AS); 7685 7686 if (TUK == TUK_Definition) 7687 New->startDefinition(); 7688 7689 // If this has an identifier, add it to the scope stack. 7690 if (TUK == TUK_Friend) { 7691 // We might be replacing an existing declaration in the lookup tables; 7692 // if so, borrow its access specifier. 7693 if (PrevDecl) 7694 New->setAccess(PrevDecl->getAccess()); 7695 7696 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 7697 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7698 if (Name) // can be null along some error paths 7699 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7700 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 7701 } else if (Name) { 7702 S = getNonFieldDeclScope(S); 7703 PushOnScopeChains(New, S, !IsForwardReference); 7704 if (IsForwardReference) 7705 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7706 7707 } else { 7708 CurContext->addDecl(New); 7709 } 7710 7711 // If this is the C FILE type, notify the AST context. 7712 if (IdentifierInfo *II = New->getIdentifier()) 7713 if (!New->isInvalidDecl() && 7714 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 7715 II->isStr("FILE")) 7716 Context.setFILEDecl(New); 7717 7718 OwnedDecl = true; 7719 return New; 7720} 7721 7722void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 7723 AdjustDeclIfTemplate(TagD); 7724 TagDecl *Tag = cast<TagDecl>(TagD); 7725 7726 // Enter the tag context. 7727 PushDeclContext(S, Tag); 7728} 7729 7730void Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 7731 assert(isa<ObjCContainerDecl>(IDecl) && 7732 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 7733 DeclContext *OCD = cast<DeclContext>(IDecl); 7734 assert(getContainingDC(OCD) == CurContext && 7735 "The next DeclContext should be lexically contained in the current one."); 7736 CurContext = OCD; 7737} 7738 7739void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 7740 SourceLocation FinalLoc, 7741 SourceLocation LBraceLoc) { 7742 AdjustDeclIfTemplate(TagD); 7743 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 7744 7745 FieldCollector->StartClass(); 7746 7747 if (!Record->getIdentifier()) 7748 return; 7749 7750 if (FinalLoc.isValid()) 7751 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 7752 7753 // C++ [class]p2: 7754 // [...] The class-name is also inserted into the scope of the 7755 // class itself; this is known as the injected-class-name. For 7756 // purposes of access checking, the injected-class-name is treated 7757 // as if it were a public member name. 7758 CXXRecordDecl *InjectedClassName 7759 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 7760 Record->getLocStart(), Record->getLocation(), 7761 Record->getIdentifier(), 7762 /*PrevDecl=*/0, 7763 /*DelayTypeCreation=*/true); 7764 Context.getTypeDeclType(InjectedClassName, Record); 7765 InjectedClassName->setImplicit(); 7766 InjectedClassName->setAccess(AS_public); 7767 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 7768 InjectedClassName->setDescribedClassTemplate(Template); 7769 PushOnScopeChains(InjectedClassName, S); 7770 assert(InjectedClassName->isInjectedClassName() && 7771 "Broken injected-class-name"); 7772} 7773 7774void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 7775 SourceLocation RBraceLoc) { 7776 AdjustDeclIfTemplate(TagD); 7777 TagDecl *Tag = cast<TagDecl>(TagD); 7778 Tag->setRBraceLoc(RBraceLoc); 7779 7780 if (isa<CXXRecordDecl>(Tag)) 7781 FieldCollector->FinishClass(); 7782 7783 // Exit this scope of this tag's definition. 7784 PopDeclContext(); 7785 7786 // Notify the consumer that we've defined a tag. 7787 Consumer.HandleTagDeclDefinition(Tag); 7788} 7789 7790void Sema::ActOnObjCContainerFinishDefinition(Decl *IDecl) { 7791 // Exit this scope of this interface definition. 7792 PopDeclContext(); 7793} 7794 7795void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 7796 AdjustDeclIfTemplate(TagD); 7797 TagDecl *Tag = cast<TagDecl>(TagD); 7798 Tag->setInvalidDecl(); 7799 7800 // We're undoing ActOnTagStartDefinition here, not 7801 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 7802 // the FieldCollector. 7803 7804 PopDeclContext(); 7805} 7806 7807// Note that FieldName may be null for anonymous bitfields. 7808bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 7809 QualType FieldTy, const Expr *BitWidth, 7810 bool *ZeroWidth) { 7811 // Default to true; that shouldn't confuse checks for emptiness 7812 if (ZeroWidth) 7813 *ZeroWidth = true; 7814 7815 // C99 6.7.2.1p4 - verify the field type. 7816 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 7817 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 7818 // Handle incomplete types with specific error. 7819 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 7820 return true; 7821 if (FieldName) 7822 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 7823 << FieldName << FieldTy << BitWidth->getSourceRange(); 7824 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 7825 << FieldTy << BitWidth->getSourceRange(); 7826 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 7827 UPPC_BitFieldWidth)) 7828 return true; 7829 7830 // If the bit-width is type- or value-dependent, don't try to check 7831 // it now. 7832 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 7833 return false; 7834 7835 llvm::APSInt Value; 7836 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 7837 return true; 7838 7839 if (Value != 0 && ZeroWidth) 7840 *ZeroWidth = false; 7841 7842 // Zero-width bitfield is ok for anonymous field. 7843 if (Value == 0 && FieldName) 7844 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 7845 7846 if (Value.isSigned() && Value.isNegative()) { 7847 if (FieldName) 7848 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 7849 << FieldName << Value.toString(10); 7850 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 7851 << Value.toString(10); 7852 } 7853 7854 if (!FieldTy->isDependentType()) { 7855 uint64_t TypeSize = Context.getTypeSize(FieldTy); 7856 if (Value.getZExtValue() > TypeSize) { 7857 if (!getLangOptions().CPlusPlus) { 7858 if (FieldName) 7859 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 7860 << FieldName << (unsigned)Value.getZExtValue() 7861 << (unsigned)TypeSize; 7862 7863 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 7864 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7865 } 7866 7867 if (FieldName) 7868 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 7869 << FieldName << (unsigned)Value.getZExtValue() 7870 << (unsigned)TypeSize; 7871 else 7872 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 7873 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7874 } 7875 } 7876 7877 return false; 7878} 7879 7880/// ActOnField - Each field of a C struct/union is passed into this in order 7881/// to create a FieldDecl object for it. 7882Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 7883 Declarator &D, ExprTy *BitfieldWidth) { 7884 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 7885 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 7886 /*HasInit=*/false, AS_public); 7887 return Res; 7888} 7889 7890/// HandleField - Analyze a field of a C struct or a C++ data member. 7891/// 7892FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 7893 SourceLocation DeclStart, 7894 Declarator &D, Expr *BitWidth, bool HasInit, 7895 AccessSpecifier AS) { 7896 IdentifierInfo *II = D.getIdentifier(); 7897 SourceLocation Loc = DeclStart; 7898 if (II) Loc = D.getIdentifierLoc(); 7899 7900 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7901 QualType T = TInfo->getType(); 7902 if (getLangOptions().CPlusPlus) { 7903 CheckExtraCXXDefaultArguments(D); 7904 7905 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 7906 UPPC_DataMemberType)) { 7907 D.setInvalidType(); 7908 T = Context.IntTy; 7909 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 7910 } 7911 } 7912 7913 DiagnoseFunctionSpecifiers(D); 7914 7915 if (D.getDeclSpec().isThreadSpecified()) 7916 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 7917 if (D.getDeclSpec().isConstexprSpecified()) 7918 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 7919 << 2; 7920 7921 // Check to see if this name was declared as a member previously 7922 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 7923 LookupName(Previous, S); 7924 assert((Previous.empty() || Previous.isOverloadedResult() || 7925 Previous.isSingleResult()) 7926 && "Lookup of member name should be either overloaded, single or null"); 7927 7928 // If the name is overloaded then get any declaration else get the single result 7929 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 7930 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 7931 7932 if (PrevDecl && PrevDecl->isTemplateParameter()) { 7933 // Maybe we will complain about the shadowed template parameter. 7934 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7935 // Just pretend that we didn't see the previous declaration. 7936 PrevDecl = 0; 7937 } 7938 7939 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 7940 PrevDecl = 0; 7941 7942 bool Mutable 7943 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 7944 SourceLocation TSSL = D.getSourceRange().getBegin(); 7945 FieldDecl *NewFD 7946 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 7947 TSSL, AS, PrevDecl, &D); 7948 7949 if (NewFD->isInvalidDecl()) 7950 Record->setInvalidDecl(); 7951 7952 if (NewFD->isInvalidDecl() && PrevDecl) { 7953 // Don't introduce NewFD into scope; there's already something 7954 // with the same name in the same scope. 7955 } else if (II) { 7956 PushOnScopeChains(NewFD, S); 7957 } else 7958 Record->addDecl(NewFD); 7959 7960 return NewFD; 7961} 7962 7963/// \brief Build a new FieldDecl and check its well-formedness. 7964/// 7965/// This routine builds a new FieldDecl given the fields name, type, 7966/// record, etc. \p PrevDecl should refer to any previous declaration 7967/// with the same name and in the same scope as the field to be 7968/// created. 7969/// 7970/// \returns a new FieldDecl. 7971/// 7972/// \todo The Declarator argument is a hack. It will be removed once 7973FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 7974 TypeSourceInfo *TInfo, 7975 RecordDecl *Record, SourceLocation Loc, 7976 bool Mutable, Expr *BitWidth, bool HasInit, 7977 SourceLocation TSSL, 7978 AccessSpecifier AS, NamedDecl *PrevDecl, 7979 Declarator *D) { 7980 IdentifierInfo *II = Name.getAsIdentifierInfo(); 7981 bool InvalidDecl = false; 7982 if (D) InvalidDecl = D->isInvalidType(); 7983 7984 // If we receive a broken type, recover by assuming 'int' and 7985 // marking this declaration as invalid. 7986 if (T.isNull()) { 7987 InvalidDecl = true; 7988 T = Context.IntTy; 7989 } 7990 7991 QualType EltTy = Context.getBaseElementType(T); 7992 if (!EltTy->isDependentType() && 7993 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 7994 // Fields of incomplete type force their record to be invalid. 7995 Record->setInvalidDecl(); 7996 InvalidDecl = true; 7997 } 7998 7999 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8000 // than a variably modified type. 8001 if (!InvalidDecl && T->isVariablyModifiedType()) { 8002 bool SizeIsNegative; 8003 llvm::APSInt Oversized; 8004 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8005 SizeIsNegative, 8006 Oversized); 8007 if (!FixedTy.isNull()) { 8008 Diag(Loc, diag::warn_illegal_constant_array_size); 8009 T = FixedTy; 8010 } else { 8011 if (SizeIsNegative) 8012 Diag(Loc, diag::err_typecheck_negative_array_size); 8013 else if (Oversized.getBoolValue()) 8014 Diag(Loc, diag::err_array_too_large) 8015 << Oversized.toString(10); 8016 else 8017 Diag(Loc, diag::err_typecheck_field_variable_size); 8018 InvalidDecl = true; 8019 } 8020 } 8021 8022 // Fields can not have abstract class types 8023 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8024 diag::err_abstract_type_in_decl, 8025 AbstractFieldType)) 8026 InvalidDecl = true; 8027 8028 bool ZeroWidth = false; 8029 // If this is declared as a bit-field, check the bit-field. 8030 if (!InvalidDecl && BitWidth && 8031 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8032 InvalidDecl = true; 8033 BitWidth = 0; 8034 ZeroWidth = false; 8035 } 8036 8037 // Check that 'mutable' is consistent with the type of the declaration. 8038 if (!InvalidDecl && Mutable) { 8039 unsigned DiagID = 0; 8040 if (T->isReferenceType()) 8041 DiagID = diag::err_mutable_reference; 8042 else if (T.isConstQualified()) 8043 DiagID = diag::err_mutable_const; 8044 8045 if (DiagID) { 8046 SourceLocation ErrLoc = Loc; 8047 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8048 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8049 Diag(ErrLoc, DiagID); 8050 Mutable = false; 8051 InvalidDecl = true; 8052 } 8053 } 8054 8055 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8056 BitWidth, Mutable, HasInit); 8057 if (InvalidDecl) 8058 NewFD->setInvalidDecl(); 8059 8060 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8061 Diag(Loc, diag::err_duplicate_member) << II; 8062 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8063 NewFD->setInvalidDecl(); 8064 } 8065 8066 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8067 if (Record->isUnion()) { 8068 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8069 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8070 if (RDecl->getDefinition()) { 8071 // C++ [class.union]p1: An object of a class with a non-trivial 8072 // constructor, a non-trivial copy constructor, a non-trivial 8073 // destructor, or a non-trivial copy assignment operator 8074 // cannot be a member of a union, nor can an array of such 8075 // objects. 8076 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(NewFD)) 8077 NewFD->setInvalidDecl(); 8078 } 8079 } 8080 8081 // C++ [class.union]p1: If a union contains a member of reference type, 8082 // the program is ill-formed. 8083 if (EltTy->isReferenceType()) { 8084 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8085 << NewFD->getDeclName() << EltTy; 8086 NewFD->setInvalidDecl(); 8087 } 8088 } 8089 } 8090 8091 // FIXME: We need to pass in the attributes given an AST 8092 // representation, not a parser representation. 8093 if (D) 8094 // FIXME: What to pass instead of TUScope? 8095 ProcessDeclAttributes(TUScope, NewFD, *D); 8096 8097 // In auto-retain/release, infer strong retension for fields of 8098 // retainable type. 8099 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8100 NewFD->setInvalidDecl(); 8101 8102 if (T.isObjCGCWeak()) 8103 Diag(Loc, diag::warn_attribute_weak_on_field); 8104 8105 NewFD->setAccess(AS); 8106 return NewFD; 8107} 8108 8109bool Sema::CheckNontrivialField(FieldDecl *FD) { 8110 assert(FD); 8111 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8112 8113 if (FD->isInvalidDecl()) 8114 return true; 8115 8116 QualType EltTy = Context.getBaseElementType(FD->getType()); 8117 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8118 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8119 if (RDecl->getDefinition()) { 8120 // We check for copy constructors before constructors 8121 // because otherwise we'll never get complaints about 8122 // copy constructors. 8123 8124 CXXSpecialMember member = CXXInvalid; 8125 if (!RDecl->hasTrivialCopyConstructor()) 8126 member = CXXCopyConstructor; 8127 else if (!RDecl->hasTrivialDefaultConstructor()) 8128 member = CXXDefaultConstructor; 8129 else if (!RDecl->hasTrivialCopyAssignment()) 8130 member = CXXCopyAssignment; 8131 else if (!RDecl->hasTrivialDestructor()) 8132 member = CXXDestructor; 8133 8134 if (member != CXXInvalid) { 8135 if (getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8136 // Objective-C++ ARC: it is an error to have a non-trivial field of 8137 // a union. However, system headers in Objective-C programs 8138 // occasionally have Objective-C lifetime objects within unions, 8139 // and rather than cause the program to fail, we make those 8140 // members unavailable. 8141 SourceLocation Loc = FD->getLocation(); 8142 if (getSourceManager().isInSystemHeader(Loc)) { 8143 if (!FD->hasAttr<UnavailableAttr>()) 8144 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8145 "this system field has retaining ownership")); 8146 return false; 8147 } 8148 } 8149 8150 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 8151 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8152 DiagnoseNontrivial(RT, member); 8153 return true; 8154 } 8155 } 8156 } 8157 8158 return false; 8159} 8160 8161/// DiagnoseNontrivial - Given that a class has a non-trivial 8162/// special member, figure out why. 8163void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8164 QualType QT(T, 0U); 8165 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8166 8167 // Check whether the member was user-declared. 8168 switch (member) { 8169 case CXXInvalid: 8170 break; 8171 8172 case CXXDefaultConstructor: 8173 if (RD->hasUserDeclaredConstructor()) { 8174 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8175 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8176 const FunctionDecl *body = 0; 8177 ci->hasBody(body); 8178 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8179 SourceLocation CtorLoc = ci->getLocation(); 8180 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8181 return; 8182 } 8183 } 8184 8185 assert(0 && "found no user-declared constructors"); 8186 return; 8187 } 8188 break; 8189 8190 case CXXCopyConstructor: 8191 if (RD->hasUserDeclaredCopyConstructor()) { 8192 SourceLocation CtorLoc = 8193 RD->getCopyConstructor(0)->getLocation(); 8194 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8195 return; 8196 } 8197 break; 8198 8199 case CXXMoveConstructor: 8200 if (RD->hasUserDeclaredMoveConstructor()) { 8201 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8202 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8203 return; 8204 } 8205 break; 8206 8207 case CXXCopyAssignment: 8208 if (RD->hasUserDeclaredCopyAssignment()) { 8209 // FIXME: this should use the location of the copy 8210 // assignment, not the type. 8211 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8212 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8213 return; 8214 } 8215 break; 8216 8217 case CXXMoveAssignment: 8218 if (RD->hasUserDeclaredMoveAssignment()) { 8219 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8220 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8221 return; 8222 } 8223 break; 8224 8225 case CXXDestructor: 8226 if (RD->hasUserDeclaredDestructor()) { 8227 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8228 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8229 return; 8230 } 8231 break; 8232 } 8233 8234 typedef CXXRecordDecl::base_class_iterator base_iter; 8235 8236 // Virtual bases and members inhibit trivial copying/construction, 8237 // but not trivial destruction. 8238 if (member != CXXDestructor) { 8239 // Check for virtual bases. vbases includes indirect virtual bases, 8240 // so we just iterate through the direct bases. 8241 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8242 if (bi->isVirtual()) { 8243 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8244 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8245 return; 8246 } 8247 8248 // Check for virtual methods. 8249 typedef CXXRecordDecl::method_iterator meth_iter; 8250 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8251 ++mi) { 8252 if (mi->isVirtual()) { 8253 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8254 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8255 return; 8256 } 8257 } 8258 } 8259 8260 bool (CXXRecordDecl::*hasTrivial)() const; 8261 switch (member) { 8262 case CXXDefaultConstructor: 8263 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8264 case CXXCopyConstructor: 8265 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8266 case CXXCopyAssignment: 8267 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8268 case CXXDestructor: 8269 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8270 default: 8271 assert(0 && "unexpected special member"); return; 8272 } 8273 8274 // Check for nontrivial bases (and recurse). 8275 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8276 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8277 assert(BaseRT && "Don't know how to handle dependent bases"); 8278 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8279 if (!(BaseRecTy->*hasTrivial)()) { 8280 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8281 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8282 DiagnoseNontrivial(BaseRT, member); 8283 return; 8284 } 8285 } 8286 8287 // Check for nontrivial members (and recurse). 8288 typedef RecordDecl::field_iterator field_iter; 8289 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8290 ++fi) { 8291 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8292 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8293 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8294 8295 if (!(EltRD->*hasTrivial)()) { 8296 SourceLocation FLoc = (*fi)->getLocation(); 8297 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8298 DiagnoseNontrivial(EltRT, member); 8299 return; 8300 } 8301 } 8302 8303 if (EltTy->isObjCLifetimeType()) { 8304 switch (EltTy.getObjCLifetime()) { 8305 case Qualifiers::OCL_None: 8306 case Qualifiers::OCL_ExplicitNone: 8307 break; 8308 8309 case Qualifiers::OCL_Autoreleasing: 8310 case Qualifiers::OCL_Weak: 8311 case Qualifiers::OCL_Strong: 8312 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8313 << QT << EltTy.getObjCLifetime(); 8314 return; 8315 } 8316 } 8317 } 8318 8319 assert(0 && "found no explanation for non-trivial member"); 8320} 8321 8322/// TranslateIvarVisibility - Translate visibility from a token ID to an 8323/// AST enum value. 8324static ObjCIvarDecl::AccessControl 8325TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8326 switch (ivarVisibility) { 8327 default: assert(0 && "Unknown visitibility kind"); 8328 case tok::objc_private: return ObjCIvarDecl::Private; 8329 case tok::objc_public: return ObjCIvarDecl::Public; 8330 case tok::objc_protected: return ObjCIvarDecl::Protected; 8331 case tok::objc_package: return ObjCIvarDecl::Package; 8332 } 8333} 8334 8335/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8336/// in order to create an IvarDecl object for it. 8337Decl *Sema::ActOnIvar(Scope *S, 8338 SourceLocation DeclStart, 8339 Declarator &D, ExprTy *BitfieldWidth, 8340 tok::ObjCKeywordKind Visibility) { 8341 8342 IdentifierInfo *II = D.getIdentifier(); 8343 Expr *BitWidth = (Expr*)BitfieldWidth; 8344 SourceLocation Loc = DeclStart; 8345 if (II) Loc = D.getIdentifierLoc(); 8346 8347 // FIXME: Unnamed fields can be handled in various different ways, for 8348 // example, unnamed unions inject all members into the struct namespace! 8349 8350 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8351 QualType T = TInfo->getType(); 8352 8353 if (BitWidth) { 8354 // 6.7.2.1p3, 6.7.2.1p4 8355 if (VerifyBitField(Loc, II, T, BitWidth)) { 8356 D.setInvalidType(); 8357 BitWidth = 0; 8358 } 8359 } else { 8360 // Not a bitfield. 8361 8362 // validate II. 8363 8364 } 8365 if (T->isReferenceType()) { 8366 Diag(Loc, diag::err_ivar_reference_type); 8367 D.setInvalidType(); 8368 } 8369 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8370 // than a variably modified type. 8371 else if (T->isVariablyModifiedType()) { 8372 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8373 D.setInvalidType(); 8374 } 8375 8376 // Get the visibility (access control) for this ivar. 8377 ObjCIvarDecl::AccessControl ac = 8378 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8379 : ObjCIvarDecl::None; 8380 // Must set ivar's DeclContext to its enclosing interface. 8381 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8382 ObjCContainerDecl *EnclosingContext; 8383 if (ObjCImplementationDecl *IMPDecl = 8384 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8385 if (!LangOpts.ObjCNonFragileABI2) { 8386 // Case of ivar declared in an implementation. Context is that of its class. 8387 EnclosingContext = IMPDecl->getClassInterface(); 8388 assert(EnclosingContext && "Implementation has no class interface!"); 8389 } 8390 else 8391 EnclosingContext = EnclosingDecl; 8392 } else { 8393 if (ObjCCategoryDecl *CDecl = 8394 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8395 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8396 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8397 return 0; 8398 } 8399 } 8400 EnclosingContext = EnclosingDecl; 8401 } 8402 8403 // Construct the decl. 8404 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8405 DeclStart, Loc, II, T, 8406 TInfo, ac, (Expr *)BitfieldWidth); 8407 8408 if (II) { 8409 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8410 ForRedeclaration); 8411 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8412 && !isa<TagDecl>(PrevDecl)) { 8413 Diag(Loc, diag::err_duplicate_member) << II; 8414 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8415 NewID->setInvalidDecl(); 8416 } 8417 } 8418 8419 // Process attributes attached to the ivar. 8420 ProcessDeclAttributes(S, NewID, D); 8421 8422 if (D.isInvalidType()) 8423 NewID->setInvalidDecl(); 8424 8425 // In ARC, infer 'retaining' for ivars of retainable type. 8426 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8427 NewID->setInvalidDecl(); 8428 8429 if (II) { 8430 // FIXME: When interfaces are DeclContexts, we'll need to add 8431 // these to the interface. 8432 S->AddDecl(NewID); 8433 IdResolver.AddDecl(NewID); 8434 } 8435 8436 return NewID; 8437} 8438 8439/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8440/// class and class extensions. For every class @interface and class 8441/// extension @interface, if the last ivar is a bitfield of any type, 8442/// then add an implicit `char :0` ivar to the end of that interface. 8443void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8444 SmallVectorImpl<Decl *> &AllIvarDecls) { 8445 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8446 return; 8447 8448 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8449 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8450 8451 if (!Ivar->isBitField()) 8452 return; 8453 uint64_t BitFieldSize = 8454 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 8455 if (BitFieldSize == 0) 8456 return; 8457 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 8458 if (!ID) { 8459 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 8460 if (!CD->IsClassExtension()) 8461 return; 8462 } 8463 // No need to add this to end of @implementation. 8464 else 8465 return; 8466 } 8467 // All conditions are met. Add a new bitfield to the tail end of ivars. 8468 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 8469 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 8470 8471 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 8472 DeclLoc, DeclLoc, 0, 8473 Context.CharTy, 8474 Context.getTrivialTypeSourceInfo(Context.CharTy, 8475 DeclLoc), 8476 ObjCIvarDecl::Private, BW, 8477 true); 8478 AllIvarDecls.push_back(Ivar); 8479} 8480 8481void Sema::ActOnFields(Scope* S, 8482 SourceLocation RecLoc, Decl *EnclosingDecl, 8483 Decl **Fields, unsigned NumFields, 8484 SourceLocation LBrac, SourceLocation RBrac, 8485 AttributeList *Attr) { 8486 assert(EnclosingDecl && "missing record or interface decl"); 8487 8488 // If the decl this is being inserted into is invalid, then it may be a 8489 // redeclaration or some other bogus case. Don't try to add fields to it. 8490 if (EnclosingDecl->isInvalidDecl()) { 8491 // FIXME: Deallocate fields? 8492 return; 8493 } 8494 8495 8496 // Verify that all the fields are okay. 8497 unsigned NumNamedMembers = 0; 8498 SmallVector<FieldDecl*, 32> RecFields; 8499 8500 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 8501 bool ARCErrReported = false; 8502 for (unsigned i = 0; i != NumFields; ++i) { 8503 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 8504 8505 // Get the type for the field. 8506 const Type *FDTy = FD->getType().getTypePtr(); 8507 8508 if (!FD->isAnonymousStructOrUnion()) { 8509 // Remember all fields written by the user. 8510 RecFields.push_back(FD); 8511 } 8512 8513 // If the field is already invalid for some reason, don't emit more 8514 // diagnostics about it. 8515 if (FD->isInvalidDecl()) { 8516 EnclosingDecl->setInvalidDecl(); 8517 continue; 8518 } 8519 8520 // C99 6.7.2.1p2: 8521 // A structure or union shall not contain a member with 8522 // incomplete or function type (hence, a structure shall not 8523 // contain an instance of itself, but may contain a pointer to 8524 // an instance of itself), except that the last member of a 8525 // structure with more than one named member may have incomplete 8526 // array type; such a structure (and any union containing, 8527 // possibly recursively, a member that is such a structure) 8528 // shall not be a member of a structure or an element of an 8529 // array. 8530 if (FDTy->isFunctionType()) { 8531 // Field declared as a function. 8532 Diag(FD->getLocation(), diag::err_field_declared_as_function) 8533 << FD->getDeclName(); 8534 FD->setInvalidDecl(); 8535 EnclosingDecl->setInvalidDecl(); 8536 continue; 8537 } else if (FDTy->isIncompleteArrayType() && Record && 8538 ((i == NumFields - 1 && !Record->isUnion()) || 8539 ((getLangOptions().Microsoft || getLangOptions().CPlusPlus) && 8540 (i == NumFields - 1 || Record->isUnion())))) { 8541 // Flexible array member. 8542 // Microsoft and g++ is more permissive regarding flexible array. 8543 // It will accept flexible array in union and also 8544 // as the sole element of a struct/class. 8545 if (getLangOptions().Microsoft) { 8546 if (Record->isUnion()) 8547 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 8548 << FD->getDeclName(); 8549 else if (NumFields == 1) 8550 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 8551 << FD->getDeclName() << Record->getTagKind(); 8552 } else if (getLangOptions().CPlusPlus) { 8553 if (Record->isUnion()) 8554 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 8555 << FD->getDeclName(); 8556 else if (NumFields == 1) 8557 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 8558 << FD->getDeclName() << Record->getTagKind(); 8559 } else if (NumNamedMembers < 1) { 8560 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 8561 << FD->getDeclName(); 8562 FD->setInvalidDecl(); 8563 EnclosingDecl->setInvalidDecl(); 8564 continue; 8565 } 8566 if (!FD->getType()->isDependentType() && 8567 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 8568 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 8569 << FD->getDeclName() << FD->getType(); 8570 FD->setInvalidDecl(); 8571 EnclosingDecl->setInvalidDecl(); 8572 continue; 8573 } 8574 // Okay, we have a legal flexible array member at the end of the struct. 8575 if (Record) 8576 Record->setHasFlexibleArrayMember(true); 8577 } else if (!FDTy->isDependentType() && 8578 RequireCompleteType(FD->getLocation(), FD->getType(), 8579 diag::err_field_incomplete)) { 8580 // Incomplete type 8581 FD->setInvalidDecl(); 8582 EnclosingDecl->setInvalidDecl(); 8583 continue; 8584 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 8585 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 8586 // If this is a member of a union, then entire union becomes "flexible". 8587 if (Record && Record->isUnion()) { 8588 Record->setHasFlexibleArrayMember(true); 8589 } else { 8590 // If this is a struct/class and this is not the last element, reject 8591 // it. Note that GCC supports variable sized arrays in the middle of 8592 // structures. 8593 if (i != NumFields-1) 8594 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 8595 << FD->getDeclName() << FD->getType(); 8596 else { 8597 // We support flexible arrays at the end of structs in 8598 // other structs as an extension. 8599 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 8600 << FD->getDeclName(); 8601 if (Record) 8602 Record->setHasFlexibleArrayMember(true); 8603 } 8604 } 8605 } 8606 if (Record && FDTTy->getDecl()->hasObjectMember()) 8607 Record->setHasObjectMember(true); 8608 } else if (FDTy->isObjCObjectType()) { 8609 /// A field cannot be an Objective-c object 8610 Diag(FD->getLocation(), diag::err_statically_allocated_object) 8611 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 8612 QualType T = Context.getObjCObjectPointerType(FD->getType()); 8613 FD->setType(T); 8614 } 8615 else if (!getLangOptions().CPlusPlus) { 8616 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 8617 // It's an error in ARC if a field has lifetime. 8618 // We don't want to report this in a system header, though, 8619 // so we just make the field unavailable. 8620 // FIXME: that's really not sufficient; we need to make the type 8621 // itself invalid to, say, initialize or copy. 8622 QualType T = FD->getType(); 8623 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 8624 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 8625 SourceLocation loc = FD->getLocation(); 8626 if (getSourceManager().isInSystemHeader(loc)) { 8627 if (!FD->hasAttr<UnavailableAttr>()) { 8628 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 8629 "this system field has retaining ownership")); 8630 } 8631 } else { 8632 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 8633 } 8634 ARCErrReported = true; 8635 } 8636 } 8637 else if (getLangOptions().ObjC1 && 8638 getLangOptions().getGCMode() != LangOptions::NonGC && 8639 Record && !Record->hasObjectMember()) { 8640 if (FD->getType()->isObjCObjectPointerType() || 8641 FD->getType().isObjCGCStrong()) 8642 Record->setHasObjectMember(true); 8643 else if (Context.getAsArrayType(FD->getType())) { 8644 QualType BaseType = Context.getBaseElementType(FD->getType()); 8645 if (BaseType->isRecordType() && 8646 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 8647 Record->setHasObjectMember(true); 8648 else if (BaseType->isObjCObjectPointerType() || 8649 BaseType.isObjCGCStrong()) 8650 Record->setHasObjectMember(true); 8651 } 8652 } 8653 } 8654 // Keep track of the number of named members. 8655 if (FD->getIdentifier()) 8656 ++NumNamedMembers; 8657 } 8658 8659 // Okay, we successfully defined 'Record'. 8660 if (Record) { 8661 bool Completed = false; 8662 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 8663 if (!CXXRecord->isInvalidDecl()) { 8664 // Set access bits correctly on the directly-declared conversions. 8665 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 8666 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 8667 I != E; ++I) 8668 Convs->setAccess(I, (*I)->getAccess()); 8669 8670 if (!CXXRecord->isDependentType()) { 8671 // Objective-C Automatic Reference Counting: 8672 // If a class has a non-static data member of Objective-C pointer 8673 // type (or array thereof), it is a non-POD type and its 8674 // default constructor (if any), copy constructor, copy assignment 8675 // operator, and destructor are non-trivial. 8676 // 8677 // This rule is also handled by CXXRecordDecl::completeDefinition(). 8678 // However, here we check whether this particular class is only 8679 // non-POD because of the presence of an Objective-C pointer member. 8680 // If so, objects of this type cannot be shared between code compiled 8681 // with instant objects and code compiled with manual retain/release. 8682 if (getLangOptions().ObjCAutoRefCount && 8683 CXXRecord->hasObjectMember() && 8684 CXXRecord->getLinkage() == ExternalLinkage) { 8685 if (CXXRecord->isPOD()) { 8686 Diag(CXXRecord->getLocation(), 8687 diag::warn_arc_non_pod_class_with_object_member) 8688 << CXXRecord; 8689 } else { 8690 // FIXME: Fix-Its would be nice here, but finding a good location 8691 // for them is going to be tricky. 8692 if (CXXRecord->hasTrivialCopyConstructor()) 8693 Diag(CXXRecord->getLocation(), 8694 diag::warn_arc_trivial_member_function_with_object_member) 8695 << CXXRecord << 0; 8696 if (CXXRecord->hasTrivialCopyAssignment()) 8697 Diag(CXXRecord->getLocation(), 8698 diag::warn_arc_trivial_member_function_with_object_member) 8699 << CXXRecord << 1; 8700 if (CXXRecord->hasTrivialDestructor()) 8701 Diag(CXXRecord->getLocation(), 8702 diag::warn_arc_trivial_member_function_with_object_member) 8703 << CXXRecord << 2; 8704 } 8705 } 8706 8707 // Adjust user-defined destructor exception spec. 8708 if (getLangOptions().CPlusPlus0x && 8709 CXXRecord->hasUserDeclaredDestructor()) 8710 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 8711 8712 // Add any implicitly-declared members to this class. 8713 AddImplicitlyDeclaredMembersToClass(CXXRecord); 8714 8715 // If we have virtual base classes, we may end up finding multiple 8716 // final overriders for a given virtual function. Check for this 8717 // problem now. 8718 if (CXXRecord->getNumVBases()) { 8719 CXXFinalOverriderMap FinalOverriders; 8720 CXXRecord->getFinalOverriders(FinalOverriders); 8721 8722 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 8723 MEnd = FinalOverriders.end(); 8724 M != MEnd; ++M) { 8725 for (OverridingMethods::iterator SO = M->second.begin(), 8726 SOEnd = M->second.end(); 8727 SO != SOEnd; ++SO) { 8728 assert(SO->second.size() > 0 && 8729 "Virtual function without overridding functions?"); 8730 if (SO->second.size() == 1) 8731 continue; 8732 8733 // C++ [class.virtual]p2: 8734 // In a derived class, if a virtual member function of a base 8735 // class subobject has more than one final overrider the 8736 // program is ill-formed. 8737 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 8738 << (NamedDecl *)M->first << Record; 8739 Diag(M->first->getLocation(), 8740 diag::note_overridden_virtual_function); 8741 for (OverridingMethods::overriding_iterator 8742 OM = SO->second.begin(), 8743 OMEnd = SO->second.end(); 8744 OM != OMEnd; ++OM) 8745 Diag(OM->Method->getLocation(), diag::note_final_overrider) 8746 << (NamedDecl *)M->first << OM->Method->getParent(); 8747 8748 Record->setInvalidDecl(); 8749 } 8750 } 8751 CXXRecord->completeDefinition(&FinalOverriders); 8752 Completed = true; 8753 } 8754 } 8755 } 8756 } 8757 8758 if (!Completed) 8759 Record->completeDefinition(); 8760 8761 // Now that the record is complete, do any delayed exception spec checks 8762 // we were missing. 8763 while (!DelayedDestructorExceptionSpecChecks.empty()) { 8764 const CXXDestructorDecl *Dtor = 8765 DelayedDestructorExceptionSpecChecks.back().first; 8766 if (Dtor->getParent() != Record) 8767 break; 8768 8769 assert(!Dtor->getParent()->isDependentType() && 8770 "Should not ever add destructors of templates into the list."); 8771 CheckOverridingFunctionExceptionSpec(Dtor, 8772 DelayedDestructorExceptionSpecChecks.back().second); 8773 DelayedDestructorExceptionSpecChecks.pop_back(); 8774 } 8775 8776 } else { 8777 ObjCIvarDecl **ClsFields = 8778 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 8779 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 8780 ID->setLocEnd(RBrac); 8781 // Add ivar's to class's DeclContext. 8782 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8783 ClsFields[i]->setLexicalDeclContext(ID); 8784 ID->addDecl(ClsFields[i]); 8785 } 8786 // Must enforce the rule that ivars in the base classes may not be 8787 // duplicates. 8788 if (ID->getSuperClass()) 8789 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 8790 } else if (ObjCImplementationDecl *IMPDecl = 8791 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8792 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 8793 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 8794 // Ivar declared in @implementation never belongs to the implementation. 8795 // Only it is in implementation's lexical context. 8796 ClsFields[I]->setLexicalDeclContext(IMPDecl); 8797 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 8798 } else if (ObjCCategoryDecl *CDecl = 8799 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8800 // case of ivars in class extension; all other cases have been 8801 // reported as errors elsewhere. 8802 // FIXME. Class extension does not have a LocEnd field. 8803 // CDecl->setLocEnd(RBrac); 8804 // Add ivar's to class extension's DeclContext. 8805 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8806 ClsFields[i]->setLexicalDeclContext(CDecl); 8807 CDecl->addDecl(ClsFields[i]); 8808 } 8809 } 8810 } 8811 8812 if (Attr) 8813 ProcessDeclAttributeList(S, Record, Attr); 8814 8815 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 8816 // set the visibility of this record. 8817 if (Record && !Record->getDeclContext()->isRecord()) 8818 AddPushedVisibilityAttribute(Record); 8819} 8820 8821/// \brief Determine whether the given integral value is representable within 8822/// the given type T. 8823static bool isRepresentableIntegerValue(ASTContext &Context, 8824 llvm::APSInt &Value, 8825 QualType T) { 8826 assert(T->isIntegralType(Context) && "Integral type required!"); 8827 unsigned BitWidth = Context.getIntWidth(T); 8828 8829 if (Value.isUnsigned() || Value.isNonNegative()) { 8830 if (T->isSignedIntegerOrEnumerationType()) 8831 --BitWidth; 8832 return Value.getActiveBits() <= BitWidth; 8833 } 8834 return Value.getMinSignedBits() <= BitWidth; 8835} 8836 8837// \brief Given an integral type, return the next larger integral type 8838// (or a NULL type of no such type exists). 8839static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 8840 // FIXME: Int128/UInt128 support, which also needs to be introduced into 8841 // enum checking below. 8842 assert(T->isIntegralType(Context) && "Integral type required!"); 8843 const unsigned NumTypes = 4; 8844 QualType SignedIntegralTypes[NumTypes] = { 8845 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 8846 }; 8847 QualType UnsignedIntegralTypes[NumTypes] = { 8848 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 8849 Context.UnsignedLongLongTy 8850 }; 8851 8852 unsigned BitWidth = Context.getTypeSize(T); 8853 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 8854 : UnsignedIntegralTypes; 8855 for (unsigned I = 0; I != NumTypes; ++I) 8856 if (Context.getTypeSize(Types[I]) > BitWidth) 8857 return Types[I]; 8858 8859 return QualType(); 8860} 8861 8862EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 8863 EnumConstantDecl *LastEnumConst, 8864 SourceLocation IdLoc, 8865 IdentifierInfo *Id, 8866 Expr *Val) { 8867 unsigned IntWidth = Context.Target.getIntWidth(); 8868 llvm::APSInt EnumVal(IntWidth); 8869 QualType EltTy; 8870 8871 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 8872 Val = 0; 8873 8874 if (Val) { 8875 if (Enum->isDependentType() || Val->isTypeDependent()) 8876 EltTy = Context.DependentTy; 8877 else { 8878 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 8879 SourceLocation ExpLoc; 8880 if (!Val->isValueDependent() && 8881 VerifyIntegerConstantExpression(Val, &EnumVal)) { 8882 Val = 0; 8883 } else { 8884 if (!getLangOptions().CPlusPlus) { 8885 // C99 6.7.2.2p2: 8886 // The expression that defines the value of an enumeration constant 8887 // shall be an integer constant expression that has a value 8888 // representable as an int. 8889 8890 // Complain if the value is not representable in an int. 8891 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 8892 Diag(IdLoc, diag::ext_enum_value_not_int) 8893 << EnumVal.toString(10) << Val->getSourceRange() 8894 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 8895 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 8896 // Force the type of the expression to 'int'. 8897 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 8898 } 8899 } 8900 8901 if (Enum->isFixed()) { 8902 EltTy = Enum->getIntegerType(); 8903 8904 // C++0x [dcl.enum]p5: 8905 // ... if the initializing value of an enumerator cannot be 8906 // represented by the underlying type, the program is ill-formed. 8907 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 8908 if (getLangOptions().Microsoft) { 8909 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 8910 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8911 } else 8912 Diag(IdLoc, diag::err_enumerator_too_large) 8913 << EltTy; 8914 } else 8915 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8916 } 8917 else { 8918 // C++0x [dcl.enum]p5: 8919 // If the underlying type is not fixed, the type of each enumerator 8920 // is the type of its initializing value: 8921 // - If an initializer is specified for an enumerator, the 8922 // initializing value has the same type as the expression. 8923 EltTy = Val->getType(); 8924 } 8925 } 8926 } 8927 } 8928 8929 if (!Val) { 8930 if (Enum->isDependentType()) 8931 EltTy = Context.DependentTy; 8932 else if (!LastEnumConst) { 8933 // C++0x [dcl.enum]p5: 8934 // If the underlying type is not fixed, the type of each enumerator 8935 // is the type of its initializing value: 8936 // - If no initializer is specified for the first enumerator, the 8937 // initializing value has an unspecified integral type. 8938 // 8939 // GCC uses 'int' for its unspecified integral type, as does 8940 // C99 6.7.2.2p3. 8941 if (Enum->isFixed()) { 8942 EltTy = Enum->getIntegerType(); 8943 } 8944 else { 8945 EltTy = Context.IntTy; 8946 } 8947 } else { 8948 // Assign the last value + 1. 8949 EnumVal = LastEnumConst->getInitVal(); 8950 ++EnumVal; 8951 EltTy = LastEnumConst->getType(); 8952 8953 // Check for overflow on increment. 8954 if (EnumVal < LastEnumConst->getInitVal()) { 8955 // C++0x [dcl.enum]p5: 8956 // If the underlying type is not fixed, the type of each enumerator 8957 // is the type of its initializing value: 8958 // 8959 // - Otherwise the type of the initializing value is the same as 8960 // the type of the initializing value of the preceding enumerator 8961 // unless the incremented value is not representable in that type, 8962 // in which case the type is an unspecified integral type 8963 // sufficient to contain the incremented value. If no such type 8964 // exists, the program is ill-formed. 8965 QualType T = getNextLargerIntegralType(Context, EltTy); 8966 if (T.isNull() || Enum->isFixed()) { 8967 // There is no integral type larger enough to represent this 8968 // value. Complain, then allow the value to wrap around. 8969 EnumVal = LastEnumConst->getInitVal(); 8970 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 8971 ++EnumVal; 8972 if (Enum->isFixed()) 8973 // When the underlying type is fixed, this is ill-formed. 8974 Diag(IdLoc, diag::err_enumerator_wrapped) 8975 << EnumVal.toString(10) 8976 << EltTy; 8977 else 8978 Diag(IdLoc, diag::warn_enumerator_too_large) 8979 << EnumVal.toString(10); 8980 } else { 8981 EltTy = T; 8982 } 8983 8984 // Retrieve the last enumerator's value, extent that type to the 8985 // type that is supposed to be large enough to represent the incremented 8986 // value, then increment. 8987 EnumVal = LastEnumConst->getInitVal(); 8988 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 8989 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 8990 ++EnumVal; 8991 8992 // If we're not in C++, diagnose the overflow of enumerator values, 8993 // which in C99 means that the enumerator value is not representable in 8994 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 8995 // permits enumerator values that are representable in some larger 8996 // integral type. 8997 if (!getLangOptions().CPlusPlus && !T.isNull()) 8998 Diag(IdLoc, diag::warn_enum_value_overflow); 8999 } else if (!getLangOptions().CPlusPlus && 9000 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9001 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9002 Diag(IdLoc, diag::ext_enum_value_not_int) 9003 << EnumVal.toString(10) << 1; 9004 } 9005 } 9006 } 9007 9008 if (!EltTy->isDependentType()) { 9009 // Make the enumerator value match the signedness and size of the 9010 // enumerator's type. 9011 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9012 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9013 } 9014 9015 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9016 Val, EnumVal); 9017} 9018 9019 9020Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9021 SourceLocation IdLoc, IdentifierInfo *Id, 9022 AttributeList *Attr, 9023 SourceLocation EqualLoc, ExprTy *val) { 9024 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9025 EnumConstantDecl *LastEnumConst = 9026 cast_or_null<EnumConstantDecl>(lastEnumConst); 9027 Expr *Val = static_cast<Expr*>(val); 9028 9029 // The scope passed in may not be a decl scope. Zip up the scope tree until 9030 // we find one that is. 9031 S = getNonFieldDeclScope(S); 9032 9033 // Verify that there isn't already something declared with this name in this 9034 // scope. 9035 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9036 ForRedeclaration); 9037 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9038 // Maybe we will complain about the shadowed template parameter. 9039 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9040 // Just pretend that we didn't see the previous declaration. 9041 PrevDecl = 0; 9042 } 9043 9044 if (PrevDecl) { 9045 // When in C++, we may get a TagDecl with the same name; in this case the 9046 // enum constant will 'hide' the tag. 9047 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9048 "Received TagDecl when not in C++!"); 9049 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9050 if (isa<EnumConstantDecl>(PrevDecl)) 9051 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9052 else 9053 Diag(IdLoc, diag::err_redefinition) << Id; 9054 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9055 return 0; 9056 } 9057 } 9058 9059 // C++ [class.mem]p13: 9060 // If T is the name of a class, then each of the following shall have a 9061 // name different from T: 9062 // - every enumerator of every member of class T that is an enumerated 9063 // type 9064 if (CXXRecordDecl *Record 9065 = dyn_cast<CXXRecordDecl>( 9066 TheEnumDecl->getDeclContext()->getRedeclContext())) 9067 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9068 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9069 9070 EnumConstantDecl *New = 9071 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9072 9073 if (New) { 9074 // Process attributes. 9075 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9076 9077 // Register this decl in the current scope stack. 9078 New->setAccess(TheEnumDecl->getAccess()); 9079 PushOnScopeChains(New, S); 9080 } 9081 9082 return New; 9083} 9084 9085void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9086 SourceLocation RBraceLoc, Decl *EnumDeclX, 9087 Decl **Elements, unsigned NumElements, 9088 Scope *S, AttributeList *Attr) { 9089 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9090 QualType EnumType = Context.getTypeDeclType(Enum); 9091 9092 if (Attr) 9093 ProcessDeclAttributeList(S, Enum, Attr); 9094 9095 if (Enum->isDependentType()) { 9096 for (unsigned i = 0; i != NumElements; ++i) { 9097 EnumConstantDecl *ECD = 9098 cast_or_null<EnumConstantDecl>(Elements[i]); 9099 if (!ECD) continue; 9100 9101 ECD->setType(EnumType); 9102 } 9103 9104 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9105 return; 9106 } 9107 9108 // TODO: If the result value doesn't fit in an int, it must be a long or long 9109 // long value. ISO C does not support this, but GCC does as an extension, 9110 // emit a warning. 9111 unsigned IntWidth = Context.Target.getIntWidth(); 9112 unsigned CharWidth = Context.Target.getCharWidth(); 9113 unsigned ShortWidth = Context.Target.getShortWidth(); 9114 9115 // Verify that all the values are okay, compute the size of the values, and 9116 // reverse the list. 9117 unsigned NumNegativeBits = 0; 9118 unsigned NumPositiveBits = 0; 9119 9120 // Keep track of whether all elements have type int. 9121 bool AllElementsInt = true; 9122 9123 for (unsigned i = 0; i != NumElements; ++i) { 9124 EnumConstantDecl *ECD = 9125 cast_or_null<EnumConstantDecl>(Elements[i]); 9126 if (!ECD) continue; // Already issued a diagnostic. 9127 9128 const llvm::APSInt &InitVal = ECD->getInitVal(); 9129 9130 // Keep track of the size of positive and negative values. 9131 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9132 NumPositiveBits = std::max(NumPositiveBits, 9133 (unsigned)InitVal.getActiveBits()); 9134 else 9135 NumNegativeBits = std::max(NumNegativeBits, 9136 (unsigned)InitVal.getMinSignedBits()); 9137 9138 // Keep track of whether every enum element has type int (very commmon). 9139 if (AllElementsInt) 9140 AllElementsInt = ECD->getType() == Context.IntTy; 9141 } 9142 9143 // Figure out the type that should be used for this enum. 9144 QualType BestType; 9145 unsigned BestWidth; 9146 9147 // C++0x N3000 [conv.prom]p3: 9148 // An rvalue of an unscoped enumeration type whose underlying 9149 // type is not fixed can be converted to an rvalue of the first 9150 // of the following types that can represent all the values of 9151 // the enumeration: int, unsigned int, long int, unsigned long 9152 // int, long long int, or unsigned long long int. 9153 // C99 6.4.4.3p2: 9154 // An identifier declared as an enumeration constant has type int. 9155 // The C99 rule is modified by a gcc extension 9156 QualType BestPromotionType; 9157 9158 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9159 // -fshort-enums is the equivalent to specifying the packed attribute on all 9160 // enum definitions. 9161 if (LangOpts.ShortEnums) 9162 Packed = true; 9163 9164 if (Enum->isFixed()) { 9165 BestType = BestPromotionType = Enum->getIntegerType(); 9166 // We don't need to set BestWidth, because BestType is going to be the type 9167 // of the enumerators, but we do anyway because otherwise some compilers 9168 // warn that it might be used uninitialized. 9169 BestWidth = CharWidth; 9170 } 9171 else if (NumNegativeBits) { 9172 // If there is a negative value, figure out the smallest integer type (of 9173 // int/long/longlong) that fits. 9174 // If it's packed, check also if it fits a char or a short. 9175 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9176 BestType = Context.SignedCharTy; 9177 BestWidth = CharWidth; 9178 } else if (Packed && NumNegativeBits <= ShortWidth && 9179 NumPositiveBits < ShortWidth) { 9180 BestType = Context.ShortTy; 9181 BestWidth = ShortWidth; 9182 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9183 BestType = Context.IntTy; 9184 BestWidth = IntWidth; 9185 } else { 9186 BestWidth = Context.Target.getLongWidth(); 9187 9188 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9189 BestType = Context.LongTy; 9190 } else { 9191 BestWidth = Context.Target.getLongLongWidth(); 9192 9193 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9194 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9195 BestType = Context.LongLongTy; 9196 } 9197 } 9198 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9199 } else { 9200 // If there is no negative value, figure out the smallest type that fits 9201 // all of the enumerator values. 9202 // If it's packed, check also if it fits a char or a short. 9203 if (Packed && NumPositiveBits <= CharWidth) { 9204 BestType = Context.UnsignedCharTy; 9205 BestPromotionType = Context.IntTy; 9206 BestWidth = CharWidth; 9207 } else if (Packed && NumPositiveBits <= ShortWidth) { 9208 BestType = Context.UnsignedShortTy; 9209 BestPromotionType = Context.IntTy; 9210 BestWidth = ShortWidth; 9211 } else if (NumPositiveBits <= IntWidth) { 9212 BestType = Context.UnsignedIntTy; 9213 BestWidth = IntWidth; 9214 BestPromotionType 9215 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9216 ? Context.UnsignedIntTy : Context.IntTy; 9217 } else if (NumPositiveBits <= 9218 (BestWidth = Context.Target.getLongWidth())) { 9219 BestType = Context.UnsignedLongTy; 9220 BestPromotionType 9221 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9222 ? Context.UnsignedLongTy : Context.LongTy; 9223 } else { 9224 BestWidth = Context.Target.getLongLongWidth(); 9225 assert(NumPositiveBits <= BestWidth && 9226 "How could an initializer get larger than ULL?"); 9227 BestType = Context.UnsignedLongLongTy; 9228 BestPromotionType 9229 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9230 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9231 } 9232 } 9233 9234 // Loop over all of the enumerator constants, changing their types to match 9235 // the type of the enum if needed. 9236 for (unsigned i = 0; i != NumElements; ++i) { 9237 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9238 if (!ECD) continue; // Already issued a diagnostic. 9239 9240 // Standard C says the enumerators have int type, but we allow, as an 9241 // extension, the enumerators to be larger than int size. If each 9242 // enumerator value fits in an int, type it as an int, otherwise type it the 9243 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9244 // that X has type 'int', not 'unsigned'. 9245 9246 // Determine whether the value fits into an int. 9247 llvm::APSInt InitVal = ECD->getInitVal(); 9248 9249 // If it fits into an integer type, force it. Otherwise force it to match 9250 // the enum decl type. 9251 QualType NewTy; 9252 unsigned NewWidth; 9253 bool NewSign; 9254 if (!getLangOptions().CPlusPlus && 9255 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9256 NewTy = Context.IntTy; 9257 NewWidth = IntWidth; 9258 NewSign = true; 9259 } else if (ECD->getType() == BestType) { 9260 // Already the right type! 9261 if (getLangOptions().CPlusPlus) 9262 // C++ [dcl.enum]p4: Following the closing brace of an 9263 // enum-specifier, each enumerator has the type of its 9264 // enumeration. 9265 ECD->setType(EnumType); 9266 continue; 9267 } else { 9268 NewTy = BestType; 9269 NewWidth = BestWidth; 9270 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9271 } 9272 9273 // Adjust the APSInt value. 9274 InitVal = InitVal.extOrTrunc(NewWidth); 9275 InitVal.setIsSigned(NewSign); 9276 ECD->setInitVal(InitVal); 9277 9278 // Adjust the Expr initializer and type. 9279 if (ECD->getInitExpr() && 9280 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9281 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9282 CK_IntegralCast, 9283 ECD->getInitExpr(), 9284 /*base paths*/ 0, 9285 VK_RValue)); 9286 if (getLangOptions().CPlusPlus) 9287 // C++ [dcl.enum]p4: Following the closing brace of an 9288 // enum-specifier, each enumerator has the type of its 9289 // enumeration. 9290 ECD->setType(EnumType); 9291 else 9292 ECD->setType(NewTy); 9293 } 9294 9295 Enum->completeDefinition(BestType, BestPromotionType, 9296 NumPositiveBits, NumNegativeBits); 9297} 9298 9299Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9300 SourceLocation StartLoc, 9301 SourceLocation EndLoc) { 9302 StringLiteral *AsmString = cast<StringLiteral>(expr); 9303 9304 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9305 AsmString, StartLoc, 9306 EndLoc); 9307 CurContext->addDecl(New); 9308 return New; 9309} 9310 9311void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9312 SourceLocation PragmaLoc, 9313 SourceLocation NameLoc) { 9314 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9315 9316 if (PrevDecl) { 9317 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9318 } else { 9319 (void)WeakUndeclaredIdentifiers.insert( 9320 std::pair<IdentifierInfo*,WeakInfo> 9321 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9322 } 9323} 9324 9325void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9326 IdentifierInfo* AliasName, 9327 SourceLocation PragmaLoc, 9328 SourceLocation NameLoc, 9329 SourceLocation AliasNameLoc) { 9330 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9331 LookupOrdinaryName); 9332 WeakInfo W = WeakInfo(Name, NameLoc); 9333 9334 if (PrevDecl) { 9335 if (!PrevDecl->hasAttr<AliasAttr>()) 9336 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9337 DeclApplyPragmaWeak(TUScope, ND, W); 9338 } else { 9339 (void)WeakUndeclaredIdentifiers.insert( 9340 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9341 } 9342} 9343 9344Decl *Sema::getObjCDeclContext() const { 9345 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9346} 9347