SemaDecl.cpp revision 10620eb5164e31208fcbf0437cd79ae535ed0559
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) { 49 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 50} 51 52/// \brief If the identifier refers to a type name within this scope, 53/// return the declaration of that type. 54/// 55/// This routine performs ordinary name lookup of the identifier II 56/// within the given scope, with optional C++ scope specifier SS, to 57/// determine whether the name refers to a type. If so, returns an 58/// opaque pointer (actually a QualType) corresponding to that 59/// type. Otherwise, returns NULL. 60/// 61/// If name lookup results in an ambiguity, this routine will complain 62/// and then return NULL. 63ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 64 Scope *S, CXXScopeSpec *SS, 65 bool isClassName, bool HasTrailingDot, 66 ParsedType ObjectTypePtr, 67 bool WantNontrivialTypeSourceInfo) { 68 // Determine where we will perform name lookup. 69 DeclContext *LookupCtx = 0; 70 if (ObjectTypePtr) { 71 QualType ObjectType = ObjectTypePtr.get(); 72 if (ObjectType->isRecordType()) 73 LookupCtx = computeDeclContext(ObjectType); 74 } else if (SS && SS->isNotEmpty()) { 75 LookupCtx = computeDeclContext(*SS, false); 76 77 if (!LookupCtx) { 78 if (isDependentScopeSpecifier(*SS)) { 79 // C++ [temp.res]p3: 80 // A qualified-id that refers to a type and in which the 81 // nested-name-specifier depends on a template-parameter (14.6.2) 82 // shall be prefixed by the keyword typename to indicate that the 83 // qualified-id denotes a type, forming an 84 // elaborated-type-specifier (7.1.5.3). 85 // 86 // We therefore do not perform any name lookup if the result would 87 // refer to a member of an unknown specialization. 88 if (!isClassName) 89 return ParsedType(); 90 91 // We know from the grammar that this name refers to a type, 92 // so build a dependent node to describe the type. 93 if (WantNontrivialTypeSourceInfo) 94 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 95 96 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 97 QualType T = 98 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 99 II, NameLoc); 100 101 return ParsedType::make(T); 102 } 103 104 return ParsedType(); 105 } 106 107 if (!LookupCtx->isDependentContext() && 108 RequireCompleteDeclContext(*SS, LookupCtx)) 109 return ParsedType(); 110 } 111 112 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 113 // lookup for class-names. 114 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 115 LookupOrdinaryName; 116 LookupResult Result(*this, &II, NameLoc, Kind); 117 if (LookupCtx) { 118 // Perform "qualified" name lookup into the declaration context we 119 // computed, which is either the type of the base of a member access 120 // expression or the declaration context associated with a prior 121 // nested-name-specifier. 122 LookupQualifiedName(Result, LookupCtx); 123 124 if (ObjectTypePtr && Result.empty()) { 125 // C++ [basic.lookup.classref]p3: 126 // If the unqualified-id is ~type-name, the type-name is looked up 127 // in the context of the entire postfix-expression. If the type T of 128 // the object expression is of a class type C, the type-name is also 129 // looked up in the scope of class C. At least one of the lookups shall 130 // find a name that refers to (possibly cv-qualified) T. 131 LookupName(Result, S); 132 } 133 } else { 134 // Perform unqualified name lookup. 135 LookupName(Result, S); 136 } 137 138 NamedDecl *IIDecl = 0; 139 switch (Result.getResultKind()) { 140 case LookupResult::NotFound: 141 case LookupResult::NotFoundInCurrentInstantiation: 142 case LookupResult::FoundOverloaded: 143 case LookupResult::FoundUnresolvedValue: 144 Result.suppressDiagnostics(); 145 return ParsedType(); 146 147 case LookupResult::Ambiguous: 148 // Recover from type-hiding ambiguities by hiding the type. We'll 149 // do the lookup again when looking for an object, and we can 150 // diagnose the error then. If we don't do this, then the error 151 // about hiding the type will be immediately followed by an error 152 // that only makes sense if the identifier was treated like a type. 153 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 154 Result.suppressDiagnostics(); 155 return ParsedType(); 156 } 157 158 // Look to see if we have a type anywhere in the list of results. 159 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 160 Res != ResEnd; ++Res) { 161 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 162 if (!IIDecl || 163 (*Res)->getLocation().getRawEncoding() < 164 IIDecl->getLocation().getRawEncoding()) 165 IIDecl = *Res; 166 } 167 } 168 169 if (!IIDecl) { 170 // None of the entities we found is a type, so there is no way 171 // to even assume that the result is a type. In this case, don't 172 // complain about the ambiguity. The parser will either try to 173 // perform this lookup again (e.g., as an object name), which 174 // will produce the ambiguity, or will complain that it expected 175 // a type name. 176 Result.suppressDiagnostics(); 177 return ParsedType(); 178 } 179 180 // We found a type within the ambiguous lookup; diagnose the 181 // ambiguity and then return that type. This might be the right 182 // answer, or it might not be, but it suppresses any attempt to 183 // perform the name lookup again. 184 break; 185 186 case LookupResult::Found: 187 IIDecl = Result.getFoundDecl(); 188 break; 189 } 190 191 assert(IIDecl && "Didn't find decl"); 192 193 QualType T; 194 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 195 DiagnoseUseOfDecl(IIDecl, NameLoc); 196 197 if (T.isNull()) 198 T = Context.getTypeDeclType(TD); 199 200 if (SS && SS->isNotEmpty()) { 201 if (WantNontrivialTypeSourceInfo) { 202 // Construct a type with type-source information. 203 TypeLocBuilder Builder; 204 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 205 206 T = getElaboratedType(ETK_None, *SS, T); 207 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 208 ElabTL.setKeywordLoc(SourceLocation()); 209 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 210 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 211 } else { 212 T = getElaboratedType(ETK_None, *SS, T); 213 } 214 } 215 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 216 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 217 if (!HasTrailingDot) 218 T = Context.getObjCInterfaceType(IDecl); 219 } 220 221 if (T.isNull()) { 222 // If it's not plausibly a type, suppress diagnostics. 223 Result.suppressDiagnostics(); 224 return ParsedType(); 225 } 226 return ParsedType::make(T); 227} 228 229/// isTagName() - This method is called *for error recovery purposes only* 230/// to determine if the specified name is a valid tag name ("struct foo"). If 231/// so, this returns the TST for the tag corresponding to it (TST_enum, 232/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 233/// where the user forgot to specify the tag. 234DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 235 // Do a tag name lookup in this scope. 236 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 237 LookupName(R, S, false); 238 R.suppressDiagnostics(); 239 if (R.getResultKind() == LookupResult::Found) 240 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 241 switch (TD->getTagKind()) { 242 default: return DeclSpec::TST_unspecified; 243 case TTK_Struct: return DeclSpec::TST_struct; 244 case TTK_Union: return DeclSpec::TST_union; 245 case TTK_Class: return DeclSpec::TST_class; 246 case TTK_Enum: return DeclSpec::TST_enum; 247 } 248 } 249 250 return DeclSpec::TST_unspecified; 251} 252 253/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 254/// if a CXXScopeSpec's type is equal to the type of one of the base classes 255/// then downgrade the missing typename error to a warning. 256/// This is needed for MSVC compatibility; Example: 257/// @code 258/// template<class T> class A { 259/// public: 260/// typedef int TYPE; 261/// }; 262/// template<class T> class B : public A<T> { 263/// public: 264/// A<T>::TYPE a; // no typename required because A<T> is a base class. 265/// }; 266/// @endcode 267bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS) { 268 if (CurContext->isRecord()) { 269 const Type *Ty = SS->getScopeRep()->getAsType(); 270 271 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 272 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 273 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 274 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 275 return true; 276 } 277 return false; 278} 279 280bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 281 SourceLocation IILoc, 282 Scope *S, 283 CXXScopeSpec *SS, 284 ParsedType &SuggestedType) { 285 // We don't have anything to suggest (yet). 286 SuggestedType = ParsedType(); 287 288 // There may have been a typo in the name of the type. Look up typo 289 // results, in case we have something that we can suggest. 290 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 291 NotForRedeclaration); 292 293 if (DeclarationName Corrected = CorrectTypo(Lookup, S, SS, 0, 0, CTC_Type)) { 294 if (NamedDecl *Result = Lookup.getAsSingle<NamedDecl>()) { 295 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 296 !Result->isInvalidDecl()) { 297 // We found a similarly-named type or interface; suggest that. 298 if (!SS || !SS->isSet()) 299 Diag(IILoc, diag::err_unknown_typename_suggest) 300 << &II << Lookup.getLookupName() 301 << FixItHint::CreateReplacement(SourceRange(IILoc), 302 Result->getNameAsString()); 303 else if (DeclContext *DC = computeDeclContext(*SS, false)) 304 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 305 << &II << DC << Lookup.getLookupName() << SS->getRange() 306 << FixItHint::CreateReplacement(SourceRange(IILoc), 307 Result->getNameAsString()); 308 else 309 llvm_unreachable("could not have corrected a typo here"); 310 311 Diag(Result->getLocation(), diag::note_previous_decl) 312 << Result->getDeclName(); 313 314 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 315 false, false, ParsedType(), 316 /*NonTrivialTypeSourceInfo=*/true); 317 return true; 318 } 319 } else if (Lookup.empty()) { 320 // We corrected to a keyword. 321 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 322 Diag(IILoc, diag::err_unknown_typename_suggest) 323 << &II << Corrected; 324 return true; 325 } 326 } 327 328 if (getLangOptions().CPlusPlus) { 329 // See if II is a class template that the user forgot to pass arguments to. 330 UnqualifiedId Name; 331 Name.setIdentifier(&II, IILoc); 332 CXXScopeSpec EmptySS; 333 TemplateTy TemplateResult; 334 bool MemberOfUnknownSpecialization; 335 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 336 Name, ParsedType(), true, TemplateResult, 337 MemberOfUnknownSpecialization) == TNK_Type_template) { 338 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 339 Diag(IILoc, diag::err_template_missing_args) << TplName; 340 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 341 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 342 << TplDecl->getTemplateParameters()->getSourceRange(); 343 } 344 return true; 345 } 346 } 347 348 // FIXME: Should we move the logic that tries to recover from a missing tag 349 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 350 351 if (!SS || (!SS->isSet() && !SS->isInvalid())) 352 Diag(IILoc, diag::err_unknown_typename) << &II; 353 else if (DeclContext *DC = computeDeclContext(*SS, false)) 354 Diag(IILoc, diag::err_typename_nested_not_found) 355 << &II << DC << SS->getRange(); 356 else if (isDependentScopeSpecifier(*SS)) { 357 unsigned DiagID = diag::err_typename_missing; 358 if (getLangOptions().Microsoft && isMicrosoftMissingTypename(SS)) 359 DiagID = diag::warn_typename_missing; 360 361 Diag(SS->getRange().getBegin(), DiagID) 362 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 363 << SourceRange(SS->getRange().getBegin(), IILoc) 364 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 365 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 366 } else { 367 assert(SS && SS->isInvalid() && 368 "Invalid scope specifier has already been diagnosed"); 369 } 370 371 return true; 372} 373 374/// \brief Determine whether the given result set contains either a type name 375/// or 376static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 377 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 378 NextToken.is(tok::less); 379 380 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 381 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 382 return true; 383 384 if (CheckTemplate && isa<TemplateDecl>(*I)) 385 return true; 386 } 387 388 return false; 389} 390 391Sema::NameClassification Sema::ClassifyName(Scope *S, 392 CXXScopeSpec &SS, 393 IdentifierInfo *&Name, 394 SourceLocation NameLoc, 395 const Token &NextToken) { 396 DeclarationNameInfo NameInfo(Name, NameLoc); 397 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 398 399 if (NextToken.is(tok::coloncolon)) { 400 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 401 QualType(), false, SS, 0, false); 402 403 } 404 405 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 406 LookupParsedName(Result, S, &SS, !CurMethod); 407 408 // Perform lookup for Objective-C instance variables (including automatically 409 // synthesized instance variables), if we're in an Objective-C method. 410 // FIXME: This lookup really, really needs to be folded in to the normal 411 // unqualified lookup mechanism. 412 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 413 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 414 if (E.get() || E.isInvalid()) 415 return E; 416 417 // Synthesize ivars lazily. 418 if (getLangOptions().ObjCDefaultSynthProperties && 419 getLangOptions().ObjCNonFragileABI2) { 420 if (SynthesizeProvisionalIvar(Result, Name, NameLoc)) { 421 if (const ObjCPropertyDecl *Property = 422 canSynthesizeProvisionalIvar(Name)) { 423 Diag(NameLoc, diag::warn_synthesized_ivar_access) << Name; 424 Diag(Property->getLocation(), diag::note_property_declare); 425 } 426 427 // FIXME: This is strange. Shouldn't we just take the ivar returned 428 // from SynthesizeProvisionalIvar and continue with that? 429 E = LookupInObjCMethod(Result, S, Name, true); 430 if (E.get() || E.isInvalid()) 431 return E; 432 } 433 } 434 } 435 436 bool SecondTry = false; 437 bool IsFilteredTemplateName = false; 438 439Corrected: 440 switch (Result.getResultKind()) { 441 case LookupResult::NotFound: 442 // If an unqualified-id is followed by a '(', then we have a function 443 // call. 444 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 445 // In C++, this is an ADL-only call. 446 // FIXME: Reference? 447 if (getLangOptions().CPlusPlus) 448 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 449 450 // C90 6.3.2.2: 451 // If the expression that precedes the parenthesized argument list in a 452 // function call consists solely of an identifier, and if no 453 // declaration is visible for this identifier, the identifier is 454 // implicitly declared exactly as if, in the innermost block containing 455 // the function call, the declaration 456 // 457 // extern int identifier (); 458 // 459 // appeared. 460 // 461 // We also allow this in C99 as an extension. 462 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 463 Result.addDecl(D); 464 Result.resolveKind(); 465 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 466 } 467 } 468 469 // In C, we first see whether there is a tag type by the same name, in 470 // which case it's likely that the user just forget to write "enum", 471 // "struct", or "union". 472 if (!getLangOptions().CPlusPlus && !SecondTry) { 473 Result.clear(LookupTagName); 474 LookupParsedName(Result, S, &SS); 475 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 476 const char *TagName = 0; 477 const char *FixItTagName = 0; 478 switch (Tag->getTagKind()) { 479 case TTK_Class: 480 TagName = "class"; 481 FixItTagName = "class "; 482 break; 483 484 case TTK_Enum: 485 TagName = "enum"; 486 FixItTagName = "enum "; 487 break; 488 489 case TTK_Struct: 490 TagName = "struct"; 491 FixItTagName = "struct "; 492 break; 493 494 case TTK_Union: 495 TagName = "union"; 496 FixItTagName = "union "; 497 break; 498 } 499 500 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 501 << Name << TagName << getLangOptions().CPlusPlus 502 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 503 break; 504 } 505 506 Result.clear(LookupOrdinaryName); 507 } 508 509 // Perform typo correction to determine if there is another name that is 510 // close to this name. 511 if (!SecondTry) { 512 if (DeclarationName Corrected = CorrectTypo(Result, S, &SS)) { 513 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 514 unsigned QualifiedDiag = diag::err_no_member_suggest; 515 516 NamedDecl *FirstDecl = Result.empty()? 0 : *Result.begin(); 517 NamedDecl *UnderlyingFirstDecl 518 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 519 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 520 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 521 UnqualifiedDiag = diag::err_no_template_suggest; 522 QualifiedDiag = diag::err_no_member_template_suggest; 523 } else if (UnderlyingFirstDecl && 524 (isa<TypeDecl>(UnderlyingFirstDecl) || 525 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 526 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 527 UnqualifiedDiag = diag::err_unknown_typename_suggest; 528 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 529 } 530 531 if (SS.isEmpty()) 532 Diag(NameLoc, UnqualifiedDiag) 533 << Name << Corrected 534 << FixItHint::CreateReplacement(NameLoc, Corrected.getAsString()); 535 else 536 Diag(NameLoc, QualifiedDiag) 537 << Name << computeDeclContext(SS, false) << Corrected 538 << SS.getRange() 539 << FixItHint::CreateReplacement(NameLoc, Corrected.getAsString()); 540 541 // Update the name, so that the caller has the new name. 542 Name = Corrected.getAsIdentifierInfo(); 543 544 // Typo correction corrected to a keyword. 545 if (Result.empty()) 546 return Corrected.getAsIdentifierInfo(); 547 548 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 549 << FirstDecl->getDeclName(); 550 551 // If we found an Objective-C instance variable, let 552 // LookupInObjCMethod build the appropriate expression to 553 // reference the ivar. 554 // FIXME: This is a gross hack. 555 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 556 Result.clear(); 557 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 558 return move(E); 559 } 560 561 goto Corrected; 562 } 563 } 564 565 // We failed to correct; just fall through and let the parser deal with it. 566 Result.suppressDiagnostics(); 567 return NameClassification::Unknown(); 568 569 case LookupResult::NotFoundInCurrentInstantiation: 570 // We performed name lookup into the current instantiation, and there were 571 // dependent bases, so we treat this result the same way as any other 572 // dependent nested-name-specifier. 573 574 // C++ [temp.res]p2: 575 // A name used in a template declaration or definition and that is 576 // dependent on a template-parameter is assumed not to name a type 577 // unless the applicable name lookup finds a type name or the name is 578 // qualified by the keyword typename. 579 // 580 // FIXME: If the next token is '<', we might want to ask the parser to 581 // perform some heroics to see if we actually have a 582 // template-argument-list, which would indicate a missing 'template' 583 // keyword here. 584 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 585 586 case LookupResult::Found: 587 case LookupResult::FoundOverloaded: 588 case LookupResult::FoundUnresolvedValue: 589 break; 590 591 case LookupResult::Ambiguous: 592 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 593 hasAnyAcceptableTemplateNames(Result)) { 594 // C++ [temp.local]p3: 595 // A lookup that finds an injected-class-name (10.2) can result in an 596 // ambiguity in certain cases (for example, if it is found in more than 597 // one base class). If all of the injected-class-names that are found 598 // refer to specializations of the same class template, and if the name 599 // is followed by a template-argument-list, the reference refers to the 600 // class template itself and not a specialization thereof, and is not 601 // ambiguous. 602 // 603 // This filtering can make an ambiguous result into an unambiguous one, 604 // so try again after filtering out template names. 605 FilterAcceptableTemplateNames(Result); 606 if (!Result.isAmbiguous()) { 607 IsFilteredTemplateName = true; 608 break; 609 } 610 } 611 612 // Diagnose the ambiguity and return an error. 613 return NameClassification::Error(); 614 } 615 616 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 617 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 618 // C++ [temp.names]p3: 619 // After name lookup (3.4) finds that a name is a template-name or that 620 // an operator-function-id or a literal- operator-id refers to a set of 621 // overloaded functions any member of which is a function template if 622 // this is followed by a <, the < is always taken as the delimiter of a 623 // template-argument-list and never as the less-than operator. 624 if (!IsFilteredTemplateName) 625 FilterAcceptableTemplateNames(Result); 626 627 if (!Result.empty()) { 628 bool IsFunctionTemplate; 629 TemplateName Template; 630 if (Result.end() - Result.begin() > 1) { 631 IsFunctionTemplate = true; 632 Template = Context.getOverloadedTemplateName(Result.begin(), 633 Result.end()); 634 } else { 635 TemplateDecl *TD 636 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 637 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 638 639 if (SS.isSet() && !SS.isInvalid()) 640 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 641 /*TemplateKeyword=*/false, 642 TD); 643 else 644 Template = TemplateName(TD); 645 } 646 647 if (IsFunctionTemplate) { 648 // Function templates always go through overload resolution, at which 649 // point we'll perform the various checks (e.g., accessibility) we need 650 // to based on which function we selected. 651 Result.suppressDiagnostics(); 652 653 return NameClassification::FunctionTemplate(Template); 654 } 655 656 return NameClassification::TypeTemplate(Template); 657 } 658 } 659 660 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 661 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 662 DiagnoseUseOfDecl(Type, NameLoc); 663 QualType T = Context.getTypeDeclType(Type); 664 return ParsedType::make(T); 665 } 666 667 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 668 if (!Class) { 669 // FIXME: It's unfortunate that we don't have a Type node for handling this. 670 if (ObjCCompatibleAliasDecl *Alias 671 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 672 Class = Alias->getClassInterface(); 673 } 674 675 if (Class) { 676 DiagnoseUseOfDecl(Class, NameLoc); 677 678 if (NextToken.is(tok::period)) { 679 // Interface. <something> is parsed as a property reference expression. 680 // Just return "unknown" as a fall-through for now. 681 Result.suppressDiagnostics(); 682 return NameClassification::Unknown(); 683 } 684 685 QualType T = Context.getObjCInterfaceType(Class); 686 return ParsedType::make(T); 687 } 688 689 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 690 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 691 692 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 693 return BuildDeclarationNameExpr(SS, Result, ADL); 694} 695 696// Determines the context to return to after temporarily entering a 697// context. This depends in an unnecessarily complicated way on the 698// exact ordering of callbacks from the parser. 699DeclContext *Sema::getContainingDC(DeclContext *DC) { 700 701 // Functions defined inline within classes aren't parsed until we've 702 // finished parsing the top-level class, so the top-level class is 703 // the context we'll need to return to. 704 if (isa<FunctionDecl>(DC)) { 705 DC = DC->getLexicalParent(); 706 707 // A function not defined within a class will always return to its 708 // lexical context. 709 if (!isa<CXXRecordDecl>(DC)) 710 return DC; 711 712 // A C++ inline method/friend is parsed *after* the topmost class 713 // it was declared in is fully parsed ("complete"); the topmost 714 // class is the context we need to return to. 715 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 716 DC = RD; 717 718 // Return the declaration context of the topmost class the inline method is 719 // declared in. 720 return DC; 721 } 722 723 // ObjCMethodDecls are parsed (for some reason) outside the context 724 // of the class. 725 if (isa<ObjCMethodDecl>(DC)) 726 return DC->getLexicalParent()->getLexicalParent(); 727 728 return DC->getLexicalParent(); 729} 730 731void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 732 assert(getContainingDC(DC) == CurContext && 733 "The next DeclContext should be lexically contained in the current one."); 734 CurContext = DC; 735 S->setEntity(DC); 736} 737 738void Sema::PopDeclContext() { 739 assert(CurContext && "DeclContext imbalance!"); 740 741 CurContext = getContainingDC(CurContext); 742 assert(CurContext && "Popped translation unit!"); 743} 744 745/// EnterDeclaratorContext - Used when we must lookup names in the context 746/// of a declarator's nested name specifier. 747/// 748void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 749 // C++0x [basic.lookup.unqual]p13: 750 // A name used in the definition of a static data member of class 751 // X (after the qualified-id of the static member) is looked up as 752 // if the name was used in a member function of X. 753 // C++0x [basic.lookup.unqual]p14: 754 // If a variable member of a namespace is defined outside of the 755 // scope of its namespace then any name used in the definition of 756 // the variable member (after the declarator-id) is looked up as 757 // if the definition of the variable member occurred in its 758 // namespace. 759 // Both of these imply that we should push a scope whose context 760 // is the semantic context of the declaration. We can't use 761 // PushDeclContext here because that context is not necessarily 762 // lexically contained in the current context. Fortunately, 763 // the containing scope should have the appropriate information. 764 765 assert(!S->getEntity() && "scope already has entity"); 766 767#ifndef NDEBUG 768 Scope *Ancestor = S->getParent(); 769 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 770 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 771#endif 772 773 CurContext = DC; 774 S->setEntity(DC); 775} 776 777void Sema::ExitDeclaratorContext(Scope *S) { 778 assert(S->getEntity() == CurContext && "Context imbalance!"); 779 780 // Switch back to the lexical context. The safety of this is 781 // enforced by an assert in EnterDeclaratorContext. 782 Scope *Ancestor = S->getParent(); 783 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 784 CurContext = (DeclContext*) Ancestor->getEntity(); 785 786 // We don't need to do anything with the scope, which is going to 787 // disappear. 788} 789 790/// \brief Determine whether we allow overloading of the function 791/// PrevDecl with another declaration. 792/// 793/// This routine determines whether overloading is possible, not 794/// whether some new function is actually an overload. It will return 795/// true in C++ (where we can always provide overloads) or, as an 796/// extension, in C when the previous function is already an 797/// overloaded function declaration or has the "overloadable" 798/// attribute. 799static bool AllowOverloadingOfFunction(LookupResult &Previous, 800 ASTContext &Context) { 801 if (Context.getLangOptions().CPlusPlus) 802 return true; 803 804 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 805 return true; 806 807 return (Previous.getResultKind() == LookupResult::Found 808 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 809} 810 811/// Add this decl to the scope shadowed decl chains. 812void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 813 // Move up the scope chain until we find the nearest enclosing 814 // non-transparent context. The declaration will be introduced into this 815 // scope. 816 while (S->getEntity() && 817 ((DeclContext *)S->getEntity())->isTransparentContext()) 818 S = S->getParent(); 819 820 // Add scoped declarations into their context, so that they can be 821 // found later. Declarations without a context won't be inserted 822 // into any context. 823 if (AddToContext) 824 CurContext->addDecl(D); 825 826 // Out-of-line definitions shouldn't be pushed into scope in C++. 827 // Out-of-line variable and function definitions shouldn't even in C. 828 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 829 D->isOutOfLine()) 830 return; 831 832 // Template instantiations should also not be pushed into scope. 833 if (isa<FunctionDecl>(D) && 834 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 835 return; 836 837 // If this replaces anything in the current scope, 838 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 839 IEnd = IdResolver.end(); 840 for (; I != IEnd; ++I) { 841 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 842 S->RemoveDecl(*I); 843 IdResolver.RemoveDecl(*I); 844 845 // Should only need to replace one decl. 846 break; 847 } 848 } 849 850 S->AddDecl(D); 851 852 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 853 // Implicitly-generated labels may end up getting generated in an order that 854 // isn't strictly lexical, which breaks name lookup. Be careful to insert 855 // the label at the appropriate place in the identifier chain. 856 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 857 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 858 if (IDC == CurContext) { 859 if (!S->isDeclScope(*I)) 860 continue; 861 } else if (IDC->Encloses(CurContext)) 862 break; 863 } 864 865 IdResolver.InsertDeclAfter(I, D); 866 } else { 867 IdResolver.AddDecl(D); 868 } 869} 870 871bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 872 bool ExplicitInstantiationOrSpecialization) { 873 return IdResolver.isDeclInScope(D, Ctx, Context, S, 874 ExplicitInstantiationOrSpecialization); 875} 876 877Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 878 DeclContext *TargetDC = DC->getPrimaryContext(); 879 do { 880 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 881 if (ScopeDC->getPrimaryContext() == TargetDC) 882 return S; 883 } while ((S = S->getParent())); 884 885 return 0; 886} 887 888static bool isOutOfScopePreviousDeclaration(NamedDecl *, 889 DeclContext*, 890 ASTContext&); 891 892/// Filters out lookup results that don't fall within the given scope 893/// as determined by isDeclInScope. 894void Sema::FilterLookupForScope(LookupResult &R, 895 DeclContext *Ctx, Scope *S, 896 bool ConsiderLinkage, 897 bool ExplicitInstantiationOrSpecialization) { 898 LookupResult::Filter F = R.makeFilter(); 899 while (F.hasNext()) { 900 NamedDecl *D = F.next(); 901 902 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 903 continue; 904 905 if (ConsiderLinkage && 906 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 907 continue; 908 909 F.erase(); 910 } 911 912 F.done(); 913} 914 915static bool isUsingDecl(NamedDecl *D) { 916 return isa<UsingShadowDecl>(D) || 917 isa<UnresolvedUsingTypenameDecl>(D) || 918 isa<UnresolvedUsingValueDecl>(D); 919} 920 921/// Removes using shadow declarations from the lookup results. 922static void RemoveUsingDecls(LookupResult &R) { 923 LookupResult::Filter F = R.makeFilter(); 924 while (F.hasNext()) 925 if (isUsingDecl(F.next())) 926 F.erase(); 927 928 F.done(); 929} 930 931/// \brief Check for this common pattern: 932/// @code 933/// class S { 934/// S(const S&); // DO NOT IMPLEMENT 935/// void operator=(const S&); // DO NOT IMPLEMENT 936/// }; 937/// @endcode 938static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 939 // FIXME: Should check for private access too but access is set after we get 940 // the decl here. 941 if (D->doesThisDeclarationHaveABody()) 942 return false; 943 944 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 945 return CD->isCopyConstructor(); 946 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 947 return Method->isCopyAssignmentOperator(); 948 return false; 949} 950 951bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 952 assert(D); 953 954 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 955 return false; 956 957 // Ignore class templates. 958 if (D->getDeclContext()->isDependentContext() || 959 D->getLexicalDeclContext()->isDependentContext()) 960 return false; 961 962 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 963 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 964 return false; 965 966 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 967 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 968 return false; 969 } else { 970 // 'static inline' functions are used in headers; don't warn. 971 if (FD->getStorageClass() == SC_Static && 972 FD->isInlineSpecified()) 973 return false; 974 } 975 976 if (FD->doesThisDeclarationHaveABody() && 977 Context.DeclMustBeEmitted(FD)) 978 return false; 979 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 980 if (!VD->isFileVarDecl() || 981 VD->getType().isConstant(Context) || 982 Context.DeclMustBeEmitted(VD)) 983 return false; 984 985 if (VD->isStaticDataMember() && 986 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 987 return false; 988 989 } else { 990 return false; 991 } 992 993 // Only warn for unused decls internal to the translation unit. 994 if (D->getLinkage() == ExternalLinkage) 995 return false; 996 997 return true; 998} 999 1000void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1001 if (!D) 1002 return; 1003 1004 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1005 const FunctionDecl *First = FD->getFirstDeclaration(); 1006 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1007 return; // First should already be in the vector. 1008 } 1009 1010 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1011 const VarDecl *First = VD->getFirstDeclaration(); 1012 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1013 return; // First should already be in the vector. 1014 } 1015 1016 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1017 UnusedFileScopedDecls.push_back(D); 1018 } 1019 1020static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1021 if (D->isInvalidDecl()) 1022 return false; 1023 1024 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1025 return false; 1026 1027 if (isa<LabelDecl>(D)) 1028 return true; 1029 1030 // White-list anything that isn't a local variable. 1031 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1032 !D->getDeclContext()->isFunctionOrMethod()) 1033 return false; 1034 1035 // Types of valid local variables should be complete, so this should succeed. 1036 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1037 1038 // White-list anything with an __attribute__((unused)) type. 1039 QualType Ty = VD->getType(); 1040 1041 // Only look at the outermost level of typedef. 1042 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1043 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1044 return false; 1045 } 1046 1047 // If we failed to complete the type for some reason, or if the type is 1048 // dependent, don't diagnose the variable. 1049 if (Ty->isIncompleteType() || Ty->isDependentType()) 1050 return false; 1051 1052 if (const TagType *TT = Ty->getAs<TagType>()) { 1053 const TagDecl *Tag = TT->getDecl(); 1054 if (Tag->hasAttr<UnusedAttr>()) 1055 return false; 1056 1057 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1058 // FIXME: Checking for the presence of a user-declared constructor 1059 // isn't completely accurate; we'd prefer to check that the initializer 1060 // has no side effects. 1061 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1062 return false; 1063 } 1064 } 1065 1066 // TODO: __attribute__((unused)) templates? 1067 } 1068 1069 return true; 1070} 1071 1072/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1073/// unless they are marked attr(unused). 1074void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1075 if (!ShouldDiagnoseUnusedDecl(D)) 1076 return; 1077 1078 unsigned DiagID; 1079 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1080 DiagID = diag::warn_unused_exception_param; 1081 else if (isa<LabelDecl>(D)) 1082 DiagID = diag::warn_unused_label; 1083 else 1084 DiagID = diag::warn_unused_variable; 1085 1086 Diag(D->getLocation(), DiagID) << D->getDeclName(); 1087} 1088 1089static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1090 // Verify that we have no forward references left. If so, there was a goto 1091 // or address of a label taken, but no definition of it. Label fwd 1092 // definitions are indicated with a null substmt. 1093 if (L->getStmt() == 0) 1094 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1095} 1096 1097void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1098 if (S->decl_empty()) return; 1099 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1100 "Scope shouldn't contain decls!"); 1101 1102 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1103 I != E; ++I) { 1104 Decl *TmpD = (*I); 1105 assert(TmpD && "This decl didn't get pushed??"); 1106 1107 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1108 NamedDecl *D = cast<NamedDecl>(TmpD); 1109 1110 if (!D->getDeclName()) continue; 1111 1112 // Diagnose unused variables in this scope. 1113 if (!S->hasErrorOccurred()) 1114 DiagnoseUnusedDecl(D); 1115 1116 // If this was a forward reference to a label, verify it was defined. 1117 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1118 CheckPoppedLabel(LD, *this); 1119 1120 // Remove this name from our lexical scope. 1121 IdResolver.RemoveDecl(D); 1122 } 1123} 1124 1125/// \brief Look for an Objective-C class in the translation unit. 1126/// 1127/// \param Id The name of the Objective-C class we're looking for. If 1128/// typo-correction fixes this name, the Id will be updated 1129/// to the fixed name. 1130/// 1131/// \param IdLoc The location of the name in the translation unit. 1132/// 1133/// \param TypoCorrection If true, this routine will attempt typo correction 1134/// if there is no class with the given name. 1135/// 1136/// \returns The declaration of the named Objective-C class, or NULL if the 1137/// class could not be found. 1138ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1139 SourceLocation IdLoc, 1140 bool TypoCorrection) { 1141 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1142 // creation from this context. 1143 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1144 1145 if (!IDecl && TypoCorrection) { 1146 // Perform typo correction at the given location, but only if we 1147 // find an Objective-C class name. 1148 LookupResult R(*this, Id, IdLoc, LookupOrdinaryName); 1149 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 1150 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 1151 Diag(IdLoc, diag::err_undef_interface_suggest) 1152 << Id << IDecl->getDeclName() 1153 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1154 Diag(IDecl->getLocation(), diag::note_previous_decl) 1155 << IDecl->getDeclName(); 1156 1157 Id = IDecl->getIdentifier(); 1158 } 1159 } 1160 1161 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1162} 1163 1164/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1165/// from S, where a non-field would be declared. This routine copes 1166/// with the difference between C and C++ scoping rules in structs and 1167/// unions. For example, the following code is well-formed in C but 1168/// ill-formed in C++: 1169/// @code 1170/// struct S6 { 1171/// enum { BAR } e; 1172/// }; 1173/// 1174/// void test_S6() { 1175/// struct S6 a; 1176/// a.e = BAR; 1177/// } 1178/// @endcode 1179/// For the declaration of BAR, this routine will return a different 1180/// scope. The scope S will be the scope of the unnamed enumeration 1181/// within S6. In C++, this routine will return the scope associated 1182/// with S6, because the enumeration's scope is a transparent 1183/// context but structures can contain non-field names. In C, this 1184/// routine will return the translation unit scope, since the 1185/// enumeration's scope is a transparent context and structures cannot 1186/// contain non-field names. 1187Scope *Sema::getNonFieldDeclScope(Scope *S) { 1188 while (((S->getFlags() & Scope::DeclScope) == 0) || 1189 (S->getEntity() && 1190 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1191 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1192 S = S->getParent(); 1193 return S; 1194} 1195 1196/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1197/// file scope. lazily create a decl for it. ForRedeclaration is true 1198/// if we're creating this built-in in anticipation of redeclaring the 1199/// built-in. 1200NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1201 Scope *S, bool ForRedeclaration, 1202 SourceLocation Loc) { 1203 Builtin::ID BID = (Builtin::ID)bid; 1204 1205 ASTContext::GetBuiltinTypeError Error; 1206 QualType R = Context.GetBuiltinType(BID, Error); 1207 switch (Error) { 1208 case ASTContext::GE_None: 1209 // Okay 1210 break; 1211 1212 case ASTContext::GE_Missing_stdio: 1213 if (ForRedeclaration) 1214 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1215 << Context.BuiltinInfo.GetName(BID); 1216 return 0; 1217 1218 case ASTContext::GE_Missing_setjmp: 1219 if (ForRedeclaration) 1220 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1221 << Context.BuiltinInfo.GetName(BID); 1222 return 0; 1223 } 1224 1225 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1226 Diag(Loc, diag::ext_implicit_lib_function_decl) 1227 << Context.BuiltinInfo.GetName(BID) 1228 << R; 1229 if (Context.BuiltinInfo.getHeaderName(BID) && 1230 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1231 != Diagnostic::Ignored) 1232 Diag(Loc, diag::note_please_include_header) 1233 << Context.BuiltinInfo.getHeaderName(BID) 1234 << Context.BuiltinInfo.GetName(BID); 1235 } 1236 1237 FunctionDecl *New = FunctionDecl::Create(Context, 1238 Context.getTranslationUnitDecl(), 1239 Loc, Loc, II, R, /*TInfo=*/0, 1240 SC_Extern, 1241 SC_None, false, 1242 /*hasPrototype=*/true); 1243 New->setImplicit(); 1244 1245 // Create Decl objects for each parameter, adding them to the 1246 // FunctionDecl. 1247 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1248 llvm::SmallVector<ParmVarDecl*, 16> Params; 1249 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1250 ParmVarDecl *parm = 1251 ParmVarDecl::Create(Context, New, SourceLocation(), 1252 SourceLocation(), 0, 1253 FT->getArgType(i), /*TInfo=*/0, 1254 SC_None, SC_None, 0); 1255 parm->setScopeInfo(0, i); 1256 Params.push_back(parm); 1257 } 1258 New->setParams(Params.data(), Params.size()); 1259 } 1260 1261 AddKnownFunctionAttributes(New); 1262 1263 // TUScope is the translation-unit scope to insert this function into. 1264 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1265 // relate Scopes to DeclContexts, and probably eliminate CurContext 1266 // entirely, but we're not there yet. 1267 DeclContext *SavedContext = CurContext; 1268 CurContext = Context.getTranslationUnitDecl(); 1269 PushOnScopeChains(New, TUScope); 1270 CurContext = SavedContext; 1271 return New; 1272} 1273 1274/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1275/// same name and scope as a previous declaration 'Old'. Figure out 1276/// how to resolve this situation, merging decls or emitting 1277/// diagnostics as appropriate. If there was an error, set New to be invalid. 1278/// 1279void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1280 // If the new decl is known invalid already, don't bother doing any 1281 // merging checks. 1282 if (New->isInvalidDecl()) return; 1283 1284 // Allow multiple definitions for ObjC built-in typedefs. 1285 // FIXME: Verify the underlying types are equivalent! 1286 if (getLangOptions().ObjC1) { 1287 const IdentifierInfo *TypeID = New->getIdentifier(); 1288 switch (TypeID->getLength()) { 1289 default: break; 1290 case 2: 1291 if (!TypeID->isStr("id")) 1292 break; 1293 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 1294 // Install the built-in type for 'id', ignoring the current definition. 1295 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1296 return; 1297 case 5: 1298 if (!TypeID->isStr("Class")) 1299 break; 1300 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 1301 // Install the built-in type for 'Class', ignoring the current definition. 1302 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1303 return; 1304 case 3: 1305 if (!TypeID->isStr("SEL")) 1306 break; 1307 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 1308 // Install the built-in type for 'SEL', ignoring the current definition. 1309 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1310 return; 1311 case 8: 1312 if (!TypeID->isStr("Protocol")) 1313 break; 1314 Context.setObjCProtoType(New->getUnderlyingType()); 1315 return; 1316 } 1317 // Fall through - the typedef name was not a builtin type. 1318 } 1319 1320 // Verify the old decl was also a type. 1321 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1322 if (!Old) { 1323 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1324 << New->getDeclName(); 1325 1326 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1327 if (OldD->getLocation().isValid()) 1328 Diag(OldD->getLocation(), diag::note_previous_definition); 1329 1330 return New->setInvalidDecl(); 1331 } 1332 1333 // If the old declaration is invalid, just give up here. 1334 if (Old->isInvalidDecl()) 1335 return New->setInvalidDecl(); 1336 1337 // Determine the "old" type we'll use for checking and diagnostics. 1338 QualType OldType; 1339 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1340 OldType = OldTypedef->getUnderlyingType(); 1341 else 1342 OldType = Context.getTypeDeclType(Old); 1343 1344 // If the typedef types are not identical, reject them in all languages and 1345 // with any extensions enabled. 1346 1347 if (OldType != New->getUnderlyingType() && 1348 Context.getCanonicalType(OldType) != 1349 Context.getCanonicalType(New->getUnderlyingType())) { 1350 int Kind = 0; 1351 if (isa<TypeAliasDecl>(Old)) 1352 Kind = 1; 1353 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1354 << Kind << New->getUnderlyingType() << OldType; 1355 if (Old->getLocation().isValid()) 1356 Diag(Old->getLocation(), diag::note_previous_definition); 1357 return New->setInvalidDecl(); 1358 } 1359 1360 // The types match. Link up the redeclaration chain if the old 1361 // declaration was a typedef. 1362 // FIXME: this is a potential source of wierdness if the type 1363 // spellings don't match exactly. 1364 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1365 New->setPreviousDeclaration(Typedef); 1366 1367 if (getLangOptions().Microsoft) 1368 return; 1369 1370 if (getLangOptions().CPlusPlus) { 1371 // C++ [dcl.typedef]p2: 1372 // In a given non-class scope, a typedef specifier can be used to 1373 // redefine the name of any type declared in that scope to refer 1374 // to the type to which it already refers. 1375 if (!isa<CXXRecordDecl>(CurContext)) 1376 return; 1377 1378 // C++0x [dcl.typedef]p4: 1379 // In a given class scope, a typedef specifier can be used to redefine 1380 // any class-name declared in that scope that is not also a typedef-name 1381 // to refer to the type to which it already refers. 1382 // 1383 // This wording came in via DR424, which was a correction to the 1384 // wording in DR56, which accidentally banned code like: 1385 // 1386 // struct S { 1387 // typedef struct A { } A; 1388 // }; 1389 // 1390 // in the C++03 standard. We implement the C++0x semantics, which 1391 // allow the above but disallow 1392 // 1393 // struct S { 1394 // typedef int I; 1395 // typedef int I; 1396 // }; 1397 // 1398 // since that was the intent of DR56. 1399 if (!isa<TypedefNameDecl>(Old)) 1400 return; 1401 1402 Diag(New->getLocation(), diag::err_redefinition) 1403 << New->getDeclName(); 1404 Diag(Old->getLocation(), diag::note_previous_definition); 1405 return New->setInvalidDecl(); 1406 } 1407 1408 // If we have a redefinition of a typedef in C, emit a warning. This warning 1409 // is normally mapped to an error, but can be controlled with 1410 // -Wtypedef-redefinition. If either the original or the redefinition is 1411 // in a system header, don't emit this for compatibility with GCC. 1412 if (getDiagnostics().getSuppressSystemWarnings() && 1413 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1414 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1415 return; 1416 1417 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1418 << New->getDeclName(); 1419 Diag(Old->getLocation(), diag::note_previous_definition); 1420 return; 1421} 1422 1423/// DeclhasAttr - returns true if decl Declaration already has the target 1424/// attribute. 1425static bool 1426DeclHasAttr(const Decl *D, const Attr *A) { 1427 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1428 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1429 if ((*i)->getKind() == A->getKind()) { 1430 // FIXME: Don't hardcode this check 1431 if (OA && isa<OwnershipAttr>(*i)) 1432 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1433 return true; 1434 } 1435 1436 return false; 1437} 1438 1439/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1440static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1441 ASTContext &C) { 1442 if (!oldDecl->hasAttrs()) 1443 return; 1444 1445 bool foundAny = newDecl->hasAttrs(); 1446 1447 // Ensure that any moving of objects within the allocated map is done before 1448 // we process them. 1449 if (!foundAny) newDecl->setAttrs(AttrVec()); 1450 1451 for (specific_attr_iterator<InheritableAttr> 1452 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1453 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1454 if (!DeclHasAttr(newDecl, *i)) { 1455 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1456 newAttr->setInherited(true); 1457 newDecl->addAttr(newAttr); 1458 foundAny = true; 1459 } 1460 } 1461 1462 if (!foundAny) newDecl->dropAttrs(); 1463} 1464 1465/// mergeParamDeclAttributes - Copy attributes from the old parameter 1466/// to the new one. 1467static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1468 const ParmVarDecl *oldDecl, 1469 ASTContext &C) { 1470 if (!oldDecl->hasAttrs()) 1471 return; 1472 1473 bool foundAny = newDecl->hasAttrs(); 1474 1475 // Ensure that any moving of objects within the allocated map is 1476 // done before we process them. 1477 if (!foundAny) newDecl->setAttrs(AttrVec()); 1478 1479 for (specific_attr_iterator<InheritableParamAttr> 1480 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1481 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1482 if (!DeclHasAttr(newDecl, *i)) { 1483 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1484 newAttr->setInherited(true); 1485 newDecl->addAttr(newAttr); 1486 foundAny = true; 1487 } 1488 } 1489 1490 if (!foundAny) newDecl->dropAttrs(); 1491} 1492 1493namespace { 1494 1495/// Used in MergeFunctionDecl to keep track of function parameters in 1496/// C. 1497struct GNUCompatibleParamWarning { 1498 ParmVarDecl *OldParm; 1499 ParmVarDecl *NewParm; 1500 QualType PromotedType; 1501}; 1502 1503} 1504 1505/// getSpecialMember - get the special member enum for a method. 1506Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1507 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1508 if (Ctor->isCopyConstructor()) 1509 return Sema::CXXCopyConstructor; 1510 1511 return Sema::CXXConstructor; 1512 } 1513 1514 if (isa<CXXDestructorDecl>(MD)) 1515 return Sema::CXXDestructor; 1516 1517 assert(MD->isCopyAssignmentOperator() && 1518 "Must have copy assignment operator"); 1519 return Sema::CXXCopyAssignment; 1520} 1521 1522/// canRedefineFunction - checks if a function can be redefined. Currently, 1523/// only extern inline functions can be redefined, and even then only in 1524/// GNU89 mode. 1525static bool canRedefineFunction(const FunctionDecl *FD, 1526 const LangOptions& LangOpts) { 1527 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 1528 FD->isInlineSpecified() && 1529 FD->getStorageClass() == SC_Extern); 1530} 1531 1532/// MergeFunctionDecl - We just parsed a function 'New' from 1533/// declarator D which has the same name and scope as a previous 1534/// declaration 'Old'. Figure out how to resolve this situation, 1535/// merging decls or emitting diagnostics as appropriate. 1536/// 1537/// In C++, New and Old must be declarations that are not 1538/// overloaded. Use IsOverload to determine whether New and Old are 1539/// overloaded, and to select the Old declaration that New should be 1540/// merged with. 1541/// 1542/// Returns true if there was an error, false otherwise. 1543bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1544 // Verify the old decl was also a function. 1545 FunctionDecl *Old = 0; 1546 if (FunctionTemplateDecl *OldFunctionTemplate 1547 = dyn_cast<FunctionTemplateDecl>(OldD)) 1548 Old = OldFunctionTemplate->getTemplatedDecl(); 1549 else 1550 Old = dyn_cast<FunctionDecl>(OldD); 1551 if (!Old) { 1552 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1553 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1554 Diag(Shadow->getTargetDecl()->getLocation(), 1555 diag::note_using_decl_target); 1556 Diag(Shadow->getUsingDecl()->getLocation(), 1557 diag::note_using_decl) << 0; 1558 return true; 1559 } 1560 1561 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1562 << New->getDeclName(); 1563 Diag(OldD->getLocation(), diag::note_previous_definition); 1564 return true; 1565 } 1566 1567 // Determine whether the previous declaration was a definition, 1568 // implicit declaration, or a declaration. 1569 diag::kind PrevDiag; 1570 if (Old->isThisDeclarationADefinition()) 1571 PrevDiag = diag::note_previous_definition; 1572 else if (Old->isImplicit()) 1573 PrevDiag = diag::note_previous_implicit_declaration; 1574 else 1575 PrevDiag = diag::note_previous_declaration; 1576 1577 QualType OldQType = Context.getCanonicalType(Old->getType()); 1578 QualType NewQType = Context.getCanonicalType(New->getType()); 1579 1580 // Don't complain about this if we're in GNU89 mode and the old function 1581 // is an extern inline function. 1582 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1583 New->getStorageClass() == SC_Static && 1584 Old->getStorageClass() != SC_Static && 1585 !canRedefineFunction(Old, getLangOptions())) { 1586 if (getLangOptions().Microsoft) { 1587 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1588 Diag(Old->getLocation(), PrevDiag); 1589 } else { 1590 Diag(New->getLocation(), diag::err_static_non_static) << New; 1591 Diag(Old->getLocation(), PrevDiag); 1592 return true; 1593 } 1594 } 1595 1596 // If a function is first declared with a calling convention, but is 1597 // later declared or defined without one, the second decl assumes the 1598 // calling convention of the first. 1599 // 1600 // For the new decl, we have to look at the NON-canonical type to tell the 1601 // difference between a function that really doesn't have a calling 1602 // convention and one that is declared cdecl. That's because in 1603 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1604 // because it is the default calling convention. 1605 // 1606 // Note also that we DO NOT return at this point, because we still have 1607 // other tests to run. 1608 const FunctionType *OldType = cast<FunctionType>(OldQType); 1609 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1610 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1611 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1612 bool RequiresAdjustment = false; 1613 if (OldTypeInfo.getCC() != CC_Default && 1614 NewTypeInfo.getCC() == CC_Default) { 1615 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1616 RequiresAdjustment = true; 1617 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1618 NewTypeInfo.getCC())) { 1619 // Calling conventions really aren't compatible, so complain. 1620 Diag(New->getLocation(), diag::err_cconv_change) 1621 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1622 << (OldTypeInfo.getCC() == CC_Default) 1623 << (OldTypeInfo.getCC() == CC_Default ? "" : 1624 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1625 Diag(Old->getLocation(), diag::note_previous_declaration); 1626 return true; 1627 } 1628 1629 // FIXME: diagnose the other way around? 1630 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1631 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1632 RequiresAdjustment = true; 1633 } 1634 1635 // Merge regparm attribute. 1636 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1637 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1638 if (NewTypeInfo.getHasRegParm()) { 1639 Diag(New->getLocation(), diag::err_regparm_mismatch) 1640 << NewType->getRegParmType() 1641 << OldType->getRegParmType(); 1642 Diag(Old->getLocation(), diag::note_previous_declaration); 1643 return true; 1644 } 1645 1646 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1647 RequiresAdjustment = true; 1648 } 1649 1650 if (RequiresAdjustment) { 1651 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1652 New->setType(QualType(NewType, 0)); 1653 NewQType = Context.getCanonicalType(New->getType()); 1654 } 1655 1656 if (getLangOptions().CPlusPlus) { 1657 // (C++98 13.1p2): 1658 // Certain function declarations cannot be overloaded: 1659 // -- Function declarations that differ only in the return type 1660 // cannot be overloaded. 1661 QualType OldReturnType = OldType->getResultType(); 1662 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1663 QualType ResQT; 1664 if (OldReturnType != NewReturnType) { 1665 if (NewReturnType->isObjCObjectPointerType() 1666 && OldReturnType->isObjCObjectPointerType()) 1667 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1668 if (ResQT.isNull()) { 1669 if (New->isCXXClassMember() && New->isOutOfLine()) 1670 Diag(New->getLocation(), 1671 diag::err_member_def_does_not_match_ret_type) << New; 1672 else 1673 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1674 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1675 return true; 1676 } 1677 else 1678 NewQType = ResQT; 1679 } 1680 1681 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1682 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1683 if (OldMethod && NewMethod) { 1684 // Preserve triviality. 1685 NewMethod->setTrivial(OldMethod->isTrivial()); 1686 1687 bool isFriend = NewMethod->getFriendObjectKind(); 1688 1689 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1690 // -- Member function declarations with the same name and the 1691 // same parameter types cannot be overloaded if any of them 1692 // is a static member function declaration. 1693 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1694 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1695 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1696 return true; 1697 } 1698 1699 // C++ [class.mem]p1: 1700 // [...] A member shall not be declared twice in the 1701 // member-specification, except that a nested class or member 1702 // class template can be declared and then later defined. 1703 unsigned NewDiag; 1704 if (isa<CXXConstructorDecl>(OldMethod)) 1705 NewDiag = diag::err_constructor_redeclared; 1706 else if (isa<CXXDestructorDecl>(NewMethod)) 1707 NewDiag = diag::err_destructor_redeclared; 1708 else if (isa<CXXConversionDecl>(NewMethod)) 1709 NewDiag = diag::err_conv_function_redeclared; 1710 else 1711 NewDiag = diag::err_member_redeclared; 1712 1713 Diag(New->getLocation(), NewDiag); 1714 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1715 1716 // Complain if this is an explicit declaration of a special 1717 // member that was initially declared implicitly. 1718 // 1719 // As an exception, it's okay to befriend such methods in order 1720 // to permit the implicit constructor/destructor/operator calls. 1721 } else if (OldMethod->isImplicit()) { 1722 if (isFriend) { 1723 NewMethod->setImplicit(); 1724 } else { 1725 Diag(NewMethod->getLocation(), 1726 diag::err_definition_of_implicitly_declared_member) 1727 << New << getSpecialMember(OldMethod); 1728 return true; 1729 } 1730 } 1731 } 1732 1733 // (C++98 8.3.5p3): 1734 // All declarations for a function shall agree exactly in both the 1735 // return type and the parameter-type-list. 1736 // We also want to respect all the extended bits except noreturn. 1737 1738 // noreturn should now match unless the old type info didn't have it. 1739 QualType OldQTypeForComparison = OldQType; 1740 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1741 assert(OldQType == QualType(OldType, 0)); 1742 const FunctionType *OldTypeForComparison 1743 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1744 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1745 assert(OldQTypeForComparison.isCanonical()); 1746 } 1747 1748 if (OldQTypeForComparison == NewQType) 1749 return MergeCompatibleFunctionDecls(New, Old); 1750 1751 // Fall through for conflicting redeclarations and redefinitions. 1752 } 1753 1754 // C: Function types need to be compatible, not identical. This handles 1755 // duplicate function decls like "void f(int); void f(enum X);" properly. 1756 if (!getLangOptions().CPlusPlus && 1757 Context.typesAreCompatible(OldQType, NewQType)) { 1758 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1759 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1760 const FunctionProtoType *OldProto = 0; 1761 if (isa<FunctionNoProtoType>(NewFuncType) && 1762 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1763 // The old declaration provided a function prototype, but the 1764 // new declaration does not. Merge in the prototype. 1765 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1766 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1767 OldProto->arg_type_end()); 1768 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1769 ParamTypes.data(), ParamTypes.size(), 1770 OldProto->getExtProtoInfo()); 1771 New->setType(NewQType); 1772 New->setHasInheritedPrototype(); 1773 1774 // Synthesize a parameter for each argument type. 1775 llvm::SmallVector<ParmVarDecl*, 16> Params; 1776 for (FunctionProtoType::arg_type_iterator 1777 ParamType = OldProto->arg_type_begin(), 1778 ParamEnd = OldProto->arg_type_end(); 1779 ParamType != ParamEnd; ++ParamType) { 1780 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1781 SourceLocation(), 1782 SourceLocation(), 0, 1783 *ParamType, /*TInfo=*/0, 1784 SC_None, SC_None, 1785 0); 1786 Param->setScopeInfo(0, Params.size()); 1787 Param->setImplicit(); 1788 Params.push_back(Param); 1789 } 1790 1791 New->setParams(Params.data(), Params.size()); 1792 } 1793 1794 return MergeCompatibleFunctionDecls(New, Old); 1795 } 1796 1797 // GNU C permits a K&R definition to follow a prototype declaration 1798 // if the declared types of the parameters in the K&R definition 1799 // match the types in the prototype declaration, even when the 1800 // promoted types of the parameters from the K&R definition differ 1801 // from the types in the prototype. GCC then keeps the types from 1802 // the prototype. 1803 // 1804 // If a variadic prototype is followed by a non-variadic K&R definition, 1805 // the K&R definition becomes variadic. This is sort of an edge case, but 1806 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1807 // C99 6.9.1p8. 1808 if (!getLangOptions().CPlusPlus && 1809 Old->hasPrototype() && !New->hasPrototype() && 1810 New->getType()->getAs<FunctionProtoType>() && 1811 Old->getNumParams() == New->getNumParams()) { 1812 llvm::SmallVector<QualType, 16> ArgTypes; 1813 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1814 const FunctionProtoType *OldProto 1815 = Old->getType()->getAs<FunctionProtoType>(); 1816 const FunctionProtoType *NewProto 1817 = New->getType()->getAs<FunctionProtoType>(); 1818 1819 // Determine whether this is the GNU C extension. 1820 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1821 NewProto->getResultType()); 1822 bool LooseCompatible = !MergedReturn.isNull(); 1823 for (unsigned Idx = 0, End = Old->getNumParams(); 1824 LooseCompatible && Idx != End; ++Idx) { 1825 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1826 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1827 if (Context.typesAreCompatible(OldParm->getType(), 1828 NewProto->getArgType(Idx))) { 1829 ArgTypes.push_back(NewParm->getType()); 1830 } else if (Context.typesAreCompatible(OldParm->getType(), 1831 NewParm->getType(), 1832 /*CompareUnqualified=*/true)) { 1833 GNUCompatibleParamWarning Warn 1834 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1835 Warnings.push_back(Warn); 1836 ArgTypes.push_back(NewParm->getType()); 1837 } else 1838 LooseCompatible = false; 1839 } 1840 1841 if (LooseCompatible) { 1842 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1843 Diag(Warnings[Warn].NewParm->getLocation(), 1844 diag::ext_param_promoted_not_compatible_with_prototype) 1845 << Warnings[Warn].PromotedType 1846 << Warnings[Warn].OldParm->getType(); 1847 if (Warnings[Warn].OldParm->getLocation().isValid()) 1848 Diag(Warnings[Warn].OldParm->getLocation(), 1849 diag::note_previous_declaration); 1850 } 1851 1852 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1853 ArgTypes.size(), 1854 OldProto->getExtProtoInfo())); 1855 return MergeCompatibleFunctionDecls(New, Old); 1856 } 1857 1858 // Fall through to diagnose conflicting types. 1859 } 1860 1861 // A function that has already been declared has been redeclared or defined 1862 // with a different type- show appropriate diagnostic 1863 if (unsigned BuiltinID = Old->getBuiltinID()) { 1864 // The user has declared a builtin function with an incompatible 1865 // signature. 1866 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1867 // The function the user is redeclaring is a library-defined 1868 // function like 'malloc' or 'printf'. Warn about the 1869 // redeclaration, then pretend that we don't know about this 1870 // library built-in. 1871 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1872 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1873 << Old << Old->getType(); 1874 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1875 Old->setInvalidDecl(); 1876 return false; 1877 } 1878 1879 PrevDiag = diag::note_previous_builtin_declaration; 1880 } 1881 1882 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1883 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1884 return true; 1885} 1886 1887/// \brief Completes the merge of two function declarations that are 1888/// known to be compatible. 1889/// 1890/// This routine handles the merging of attributes and other 1891/// properties of function declarations form the old declaration to 1892/// the new declaration, once we know that New is in fact a 1893/// redeclaration of Old. 1894/// 1895/// \returns false 1896bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1897 // Merge the attributes 1898 mergeDeclAttributes(New, Old, Context); 1899 1900 // Merge the storage class. 1901 if (Old->getStorageClass() != SC_Extern && 1902 Old->getStorageClass() != SC_None) 1903 New->setStorageClass(Old->getStorageClass()); 1904 1905 // Merge "pure" flag. 1906 if (Old->isPure()) 1907 New->setPure(); 1908 1909 // Merge attributes from the parameters. These can mismatch with K&R 1910 // declarations. 1911 if (New->getNumParams() == Old->getNumParams()) 1912 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 1913 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 1914 Context); 1915 1916 if (getLangOptions().CPlusPlus) 1917 return MergeCXXFunctionDecl(New, Old); 1918 1919 return false; 1920} 1921 1922void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 1923 const ObjCMethodDecl *oldMethod) { 1924 // Merge the attributes. 1925 mergeDeclAttributes(newMethod, oldMethod, Context); 1926 1927 // Merge attributes from the parameters. 1928 for (ObjCMethodDecl::param_iterator oi = oldMethod->param_begin(), 1929 ni = newMethod->param_begin(), ne = newMethod->param_end(); 1930 ni != ne; ++ni, ++oi) 1931 mergeParamDeclAttributes(*ni, *oi, Context); 1932} 1933 1934/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 1935/// scope as a previous declaration 'Old'. Figure out how to merge their types, 1936/// emitting diagnostics as appropriate. 1937/// 1938/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 1939/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 1940/// check them before the initializer is attached. 1941/// 1942void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 1943 if (New->isInvalidDecl() || Old->isInvalidDecl()) 1944 return; 1945 1946 QualType MergedT; 1947 if (getLangOptions().CPlusPlus) { 1948 AutoType *AT = New->getType()->getContainedAutoType(); 1949 if (AT && !AT->isDeduced()) { 1950 // We don't know what the new type is until the initializer is attached. 1951 return; 1952 } else if (Context.hasSameType(New->getType(), Old->getType())) { 1953 // These could still be something that needs exception specs checked. 1954 return MergeVarDeclExceptionSpecs(New, Old); 1955 } 1956 // C++ [basic.link]p10: 1957 // [...] the types specified by all declarations referring to a given 1958 // object or function shall be identical, except that declarations for an 1959 // array object can specify array types that differ by the presence or 1960 // absence of a major array bound (8.3.4). 1961 else if (Old->getType()->isIncompleteArrayType() && 1962 New->getType()->isArrayType()) { 1963 CanQual<ArrayType> OldArray 1964 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1965 CanQual<ArrayType> NewArray 1966 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1967 if (OldArray->getElementType() == NewArray->getElementType()) 1968 MergedT = New->getType(); 1969 } else if (Old->getType()->isArrayType() && 1970 New->getType()->isIncompleteArrayType()) { 1971 CanQual<ArrayType> OldArray 1972 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1973 CanQual<ArrayType> NewArray 1974 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1975 if (OldArray->getElementType() == NewArray->getElementType()) 1976 MergedT = Old->getType(); 1977 } else if (New->getType()->isObjCObjectPointerType() 1978 && Old->getType()->isObjCObjectPointerType()) { 1979 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 1980 Old->getType()); 1981 } 1982 } else { 1983 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1984 } 1985 if (MergedT.isNull()) { 1986 Diag(New->getLocation(), diag::err_redefinition_different_type) 1987 << New->getDeclName(); 1988 Diag(Old->getLocation(), diag::note_previous_definition); 1989 return New->setInvalidDecl(); 1990 } 1991 New->setType(MergedT); 1992} 1993 1994/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1995/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1996/// situation, merging decls or emitting diagnostics as appropriate. 1997/// 1998/// Tentative definition rules (C99 6.9.2p2) are checked by 1999/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2000/// definitions here, since the initializer hasn't been attached. 2001/// 2002void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2003 // If the new decl is already invalid, don't do any other checking. 2004 if (New->isInvalidDecl()) 2005 return; 2006 2007 // Verify the old decl was also a variable. 2008 VarDecl *Old = 0; 2009 if (!Previous.isSingleResult() || 2010 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2011 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2012 << New->getDeclName(); 2013 Diag(Previous.getRepresentativeDecl()->getLocation(), 2014 diag::note_previous_definition); 2015 return New->setInvalidDecl(); 2016 } 2017 2018 // C++ [class.mem]p1: 2019 // A member shall not be declared twice in the member-specification [...] 2020 // 2021 // Here, we need only consider static data members. 2022 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2023 Diag(New->getLocation(), diag::err_duplicate_member) 2024 << New->getIdentifier(); 2025 Diag(Old->getLocation(), diag::note_previous_declaration); 2026 New->setInvalidDecl(); 2027 } 2028 2029 mergeDeclAttributes(New, Old, Context); 2030 2031 // Merge the types. 2032 MergeVarDeclTypes(New, Old); 2033 if (New->isInvalidDecl()) 2034 return; 2035 2036 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2037 if (New->getStorageClass() == SC_Static && 2038 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2039 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2040 Diag(Old->getLocation(), diag::note_previous_definition); 2041 return New->setInvalidDecl(); 2042 } 2043 // C99 6.2.2p4: 2044 // For an identifier declared with the storage-class specifier 2045 // extern in a scope in which a prior declaration of that 2046 // identifier is visible,23) if the prior declaration specifies 2047 // internal or external linkage, the linkage of the identifier at 2048 // the later declaration is the same as the linkage specified at 2049 // the prior declaration. If no prior declaration is visible, or 2050 // if the prior declaration specifies no linkage, then the 2051 // identifier has external linkage. 2052 if (New->hasExternalStorage() && Old->hasLinkage()) 2053 /* Okay */; 2054 else if (New->getStorageClass() != SC_Static && 2055 Old->getStorageClass() == SC_Static) { 2056 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2057 Diag(Old->getLocation(), diag::note_previous_definition); 2058 return New->setInvalidDecl(); 2059 } 2060 2061 // Check if extern is followed by non-extern and vice-versa. 2062 if (New->hasExternalStorage() && 2063 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2064 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2065 Diag(Old->getLocation(), diag::note_previous_definition); 2066 return New->setInvalidDecl(); 2067 } 2068 if (Old->hasExternalStorage() && 2069 !New->hasLinkage() && New->isLocalVarDecl()) { 2070 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2071 Diag(Old->getLocation(), diag::note_previous_definition); 2072 return New->setInvalidDecl(); 2073 } 2074 2075 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2076 2077 // FIXME: The test for external storage here seems wrong? We still 2078 // need to check for mismatches. 2079 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2080 // Don't complain about out-of-line definitions of static members. 2081 !(Old->getLexicalDeclContext()->isRecord() && 2082 !New->getLexicalDeclContext()->isRecord())) { 2083 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2084 Diag(Old->getLocation(), diag::note_previous_definition); 2085 return New->setInvalidDecl(); 2086 } 2087 2088 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2089 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2090 Diag(Old->getLocation(), diag::note_previous_definition); 2091 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2092 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2093 Diag(Old->getLocation(), diag::note_previous_definition); 2094 } 2095 2096 // C++ doesn't have tentative definitions, so go right ahead and check here. 2097 const VarDecl *Def; 2098 if (getLangOptions().CPlusPlus && 2099 New->isThisDeclarationADefinition() == VarDecl::Definition && 2100 (Def = Old->getDefinition())) { 2101 Diag(New->getLocation(), diag::err_redefinition) 2102 << New->getDeclName(); 2103 Diag(Def->getLocation(), diag::note_previous_definition); 2104 New->setInvalidDecl(); 2105 return; 2106 } 2107 // c99 6.2.2 P4. 2108 // For an identifier declared with the storage-class specifier extern in a 2109 // scope in which a prior declaration of that identifier is visible, if 2110 // the prior declaration specifies internal or external linkage, the linkage 2111 // of the identifier at the later declaration is the same as the linkage 2112 // specified at the prior declaration. 2113 // FIXME. revisit this code. 2114 if (New->hasExternalStorage() && 2115 Old->getLinkage() == InternalLinkage && 2116 New->getDeclContext() == Old->getDeclContext()) 2117 New->setStorageClass(Old->getStorageClass()); 2118 2119 // Keep a chain of previous declarations. 2120 New->setPreviousDeclaration(Old); 2121 2122 // Inherit access appropriately. 2123 New->setAccess(Old->getAccess()); 2124} 2125 2126/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2127/// no declarator (e.g. "struct foo;") is parsed. 2128Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2129 DeclSpec &DS) { 2130 return ParsedFreeStandingDeclSpec(S, AS, DS, 2131 MultiTemplateParamsArg(*this, 0, 0)); 2132} 2133 2134/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2135/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2136/// parameters to cope with template friend declarations. 2137Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2138 DeclSpec &DS, 2139 MultiTemplateParamsArg TemplateParams) { 2140 Decl *TagD = 0; 2141 TagDecl *Tag = 0; 2142 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2143 DS.getTypeSpecType() == DeclSpec::TST_struct || 2144 DS.getTypeSpecType() == DeclSpec::TST_union || 2145 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2146 TagD = DS.getRepAsDecl(); 2147 2148 if (!TagD) // We probably had an error 2149 return 0; 2150 2151 // Note that the above type specs guarantee that the 2152 // type rep is a Decl, whereas in many of the others 2153 // it's a Type. 2154 Tag = dyn_cast<TagDecl>(TagD); 2155 } 2156 2157 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2158 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2159 // or incomplete types shall not be restrict-qualified." 2160 if (TypeQuals & DeclSpec::TQ_restrict) 2161 Diag(DS.getRestrictSpecLoc(), 2162 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2163 << DS.getSourceRange(); 2164 } 2165 2166 if (DS.isFriendSpecified()) { 2167 // If we're dealing with a decl but not a TagDecl, assume that 2168 // whatever routines created it handled the friendship aspect. 2169 if (TagD && !Tag) 2170 return 0; 2171 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2172 } 2173 2174 // Track whether we warned about the fact that there aren't any 2175 // declarators. 2176 bool emittedWarning = false; 2177 2178 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2179 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2180 2181 if (!Record->getDeclName() && Record->isDefinition() && 2182 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2183 if (getLangOptions().CPlusPlus || 2184 Record->getDeclContext()->isRecord()) 2185 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2186 2187 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2188 << DS.getSourceRange(); 2189 emittedWarning = true; 2190 } 2191 } 2192 2193 // Check for Microsoft C extension: anonymous struct. 2194 if (getLangOptions().Microsoft && !getLangOptions().CPlusPlus && 2195 CurContext->isRecord() && 2196 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2197 // Handle 2 kinds of anonymous struct: 2198 // struct STRUCT; 2199 // and 2200 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2201 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2202 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 2203 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2204 DS.getRepAsType().get()->isStructureType())) { 2205 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2206 << DS.getSourceRange(); 2207 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2208 } 2209 } 2210 2211 if (getLangOptions().CPlusPlus && 2212 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2213 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2214 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2215 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2216 Diag(Enum->getLocation(), diag::ext_no_declarators) 2217 << DS.getSourceRange(); 2218 emittedWarning = true; 2219 } 2220 2221 // Skip all the checks below if we have a type error. 2222 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2223 2224 if (!DS.isMissingDeclaratorOk()) { 2225 // Warn about typedefs of enums without names, since this is an 2226 // extension in both Microsoft and GNU. 2227 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2228 Tag && isa<EnumDecl>(Tag)) { 2229 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2230 << DS.getSourceRange(); 2231 return Tag; 2232 } 2233 2234 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2235 << DS.getSourceRange(); 2236 emittedWarning = true; 2237 } 2238 2239 // We're going to complain about a bunch of spurious specifiers; 2240 // only do this if we're declaring a tag, because otherwise we 2241 // should be getting diag::ext_no_declarators. 2242 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2243 return TagD; 2244 2245 // Note that a linkage-specification sets a storage class, but 2246 // 'extern "C" struct foo;' is actually valid and not theoretically 2247 // useless. 2248 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2249 if (!DS.isExternInLinkageSpec()) 2250 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2251 << DeclSpec::getSpecifierName(scs); 2252 2253 if (DS.isThreadSpecified()) 2254 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2255 if (DS.getTypeQualifiers()) { 2256 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2257 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2258 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2259 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2260 // Restrict is covered above. 2261 } 2262 if (DS.isInlineSpecified()) 2263 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2264 if (DS.isVirtualSpecified()) 2265 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2266 if (DS.isExplicitSpecified()) 2267 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2268 2269 // FIXME: Warn on useless attributes 2270 2271 return TagD; 2272} 2273 2274/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2275/// builds a statement for it and returns it so it is evaluated. 2276StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2277 StmtResult R; 2278 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2279 Expr *Exp = DS.getRepAsExpr(); 2280 QualType Ty = Exp->getType(); 2281 if (Ty->isPointerType()) { 2282 do 2283 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2284 while (Ty->isPointerType()); 2285 } 2286 if (Ty->isVariableArrayType()) { 2287 R = ActOnExprStmt(MakeFullExpr(Exp)); 2288 } 2289 } 2290 return R; 2291} 2292 2293/// We are trying to inject an anonymous member into the given scope; 2294/// check if there's an existing declaration that can't be overloaded. 2295/// 2296/// \return true if this is a forbidden redeclaration 2297static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2298 Scope *S, 2299 DeclContext *Owner, 2300 DeclarationName Name, 2301 SourceLocation NameLoc, 2302 unsigned diagnostic) { 2303 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2304 Sema::ForRedeclaration); 2305 if (!SemaRef.LookupName(R, S)) return false; 2306 2307 if (R.getAsSingle<TagDecl>()) 2308 return false; 2309 2310 // Pick a representative declaration. 2311 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2312 assert(PrevDecl && "Expected a non-null Decl"); 2313 2314 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2315 return false; 2316 2317 SemaRef.Diag(NameLoc, diagnostic) << Name; 2318 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2319 2320 return true; 2321} 2322 2323/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2324/// anonymous struct or union AnonRecord into the owning context Owner 2325/// and scope S. This routine will be invoked just after we realize 2326/// that an unnamed union or struct is actually an anonymous union or 2327/// struct, e.g., 2328/// 2329/// @code 2330/// union { 2331/// int i; 2332/// float f; 2333/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2334/// // f into the surrounding scope.x 2335/// @endcode 2336/// 2337/// This routine is recursive, injecting the names of nested anonymous 2338/// structs/unions into the owning context and scope as well. 2339static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2340 DeclContext *Owner, 2341 RecordDecl *AnonRecord, 2342 AccessSpecifier AS, 2343 llvm::SmallVector<NamedDecl*, 2> &Chaining, 2344 bool MSAnonStruct) { 2345 unsigned diagKind 2346 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2347 : diag::err_anonymous_struct_member_redecl; 2348 2349 bool Invalid = false; 2350 2351 // Look every FieldDecl and IndirectFieldDecl with a name. 2352 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2353 DEnd = AnonRecord->decls_end(); 2354 D != DEnd; ++D) { 2355 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2356 cast<NamedDecl>(*D)->getDeclName()) { 2357 ValueDecl *VD = cast<ValueDecl>(*D); 2358 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2359 VD->getLocation(), diagKind)) { 2360 // C++ [class.union]p2: 2361 // The names of the members of an anonymous union shall be 2362 // distinct from the names of any other entity in the 2363 // scope in which the anonymous union is declared. 2364 Invalid = true; 2365 } else { 2366 // C++ [class.union]p2: 2367 // For the purpose of name lookup, after the anonymous union 2368 // definition, the members of the anonymous union are 2369 // considered to have been defined in the scope in which the 2370 // anonymous union is declared. 2371 unsigned OldChainingSize = Chaining.size(); 2372 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2373 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2374 PE = IF->chain_end(); PI != PE; ++PI) 2375 Chaining.push_back(*PI); 2376 else 2377 Chaining.push_back(VD); 2378 2379 assert(Chaining.size() >= 2); 2380 NamedDecl **NamedChain = 2381 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2382 for (unsigned i = 0; i < Chaining.size(); i++) 2383 NamedChain[i] = Chaining[i]; 2384 2385 IndirectFieldDecl* IndirectField = 2386 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2387 VD->getIdentifier(), VD->getType(), 2388 NamedChain, Chaining.size()); 2389 2390 IndirectField->setAccess(AS); 2391 IndirectField->setImplicit(); 2392 SemaRef.PushOnScopeChains(IndirectField, S); 2393 2394 // That includes picking up the appropriate access specifier. 2395 if (AS != AS_none) IndirectField->setAccess(AS); 2396 2397 Chaining.resize(OldChainingSize); 2398 } 2399 } 2400 } 2401 2402 return Invalid; 2403} 2404 2405/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2406/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2407/// illegal input values are mapped to SC_None. 2408static StorageClass 2409StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2410 switch (StorageClassSpec) { 2411 case DeclSpec::SCS_unspecified: return SC_None; 2412 case DeclSpec::SCS_extern: return SC_Extern; 2413 case DeclSpec::SCS_static: return SC_Static; 2414 case DeclSpec::SCS_auto: return SC_Auto; 2415 case DeclSpec::SCS_register: return SC_Register; 2416 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2417 // Illegal SCSs map to None: error reporting is up to the caller. 2418 case DeclSpec::SCS_mutable: // Fall through. 2419 case DeclSpec::SCS_typedef: return SC_None; 2420 } 2421 llvm_unreachable("unknown storage class specifier"); 2422} 2423 2424/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2425/// a StorageClass. Any error reporting is up to the caller: 2426/// illegal input values are mapped to SC_None. 2427static StorageClass 2428StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2429 switch (StorageClassSpec) { 2430 case DeclSpec::SCS_unspecified: return SC_None; 2431 case DeclSpec::SCS_extern: return SC_Extern; 2432 case DeclSpec::SCS_static: return SC_Static; 2433 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2434 // Illegal SCSs map to None: error reporting is up to the caller. 2435 case DeclSpec::SCS_auto: // Fall through. 2436 case DeclSpec::SCS_mutable: // Fall through. 2437 case DeclSpec::SCS_register: // Fall through. 2438 case DeclSpec::SCS_typedef: return SC_None; 2439 } 2440 llvm_unreachable("unknown storage class specifier"); 2441} 2442 2443/// BuildAnonymousStructOrUnion - Handle the declaration of an 2444/// anonymous structure or union. Anonymous unions are a C++ feature 2445/// (C++ [class.union]) and a GNU C extension; anonymous structures 2446/// are a GNU C and GNU C++ extension. 2447Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2448 AccessSpecifier AS, 2449 RecordDecl *Record) { 2450 DeclContext *Owner = Record->getDeclContext(); 2451 2452 // Diagnose whether this anonymous struct/union is an extension. 2453 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2454 Diag(Record->getLocation(), diag::ext_anonymous_union); 2455 else if (!Record->isUnion()) 2456 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2457 2458 // C and C++ require different kinds of checks for anonymous 2459 // structs/unions. 2460 bool Invalid = false; 2461 if (getLangOptions().CPlusPlus) { 2462 const char* PrevSpec = 0; 2463 unsigned DiagID; 2464 // C++ [class.union]p3: 2465 // Anonymous unions declared in a named namespace or in the 2466 // global namespace shall be declared static. 2467 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2468 (isa<TranslationUnitDecl>(Owner) || 2469 (isa<NamespaceDecl>(Owner) && 2470 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2471 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2472 Invalid = true; 2473 2474 // Recover by adding 'static'. 2475 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 2476 PrevSpec, DiagID, getLangOptions()); 2477 } 2478 // C++ [class.union]p3: 2479 // A storage class is not allowed in a declaration of an 2480 // anonymous union in a class scope. 2481 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2482 isa<RecordDecl>(Owner)) { 2483 Diag(DS.getStorageClassSpecLoc(), 2484 diag::err_anonymous_union_with_storage_spec); 2485 Invalid = true; 2486 2487 // Recover by removing the storage specifier. 2488 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 2489 PrevSpec, DiagID, getLangOptions()); 2490 } 2491 2492 // C++ [class.union]p2: 2493 // The member-specification of an anonymous union shall only 2494 // define non-static data members. [Note: nested types and 2495 // functions cannot be declared within an anonymous union. ] 2496 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2497 MemEnd = Record->decls_end(); 2498 Mem != MemEnd; ++Mem) { 2499 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2500 // C++ [class.union]p3: 2501 // An anonymous union shall not have private or protected 2502 // members (clause 11). 2503 assert(FD->getAccess() != AS_none); 2504 if (FD->getAccess() != AS_public) { 2505 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2506 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2507 Invalid = true; 2508 } 2509 2510 if (CheckNontrivialField(FD)) 2511 Invalid = true; 2512 } else if ((*Mem)->isImplicit()) { 2513 // Any implicit members are fine. 2514 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2515 // This is a type that showed up in an 2516 // elaborated-type-specifier inside the anonymous struct or 2517 // union, but which actually declares a type outside of the 2518 // anonymous struct or union. It's okay. 2519 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2520 if (!MemRecord->isAnonymousStructOrUnion() && 2521 MemRecord->getDeclName()) { 2522 // Visual C++ allows type definition in anonymous struct or union. 2523 if (getLangOptions().Microsoft) 2524 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2525 << (int)Record->isUnion(); 2526 else { 2527 // This is a nested type declaration. 2528 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2529 << (int)Record->isUnion(); 2530 Invalid = true; 2531 } 2532 } 2533 } else if (isa<AccessSpecDecl>(*Mem)) { 2534 // Any access specifier is fine. 2535 } else { 2536 // We have something that isn't a non-static data 2537 // member. Complain about it. 2538 unsigned DK = diag::err_anonymous_record_bad_member; 2539 if (isa<TypeDecl>(*Mem)) 2540 DK = diag::err_anonymous_record_with_type; 2541 else if (isa<FunctionDecl>(*Mem)) 2542 DK = diag::err_anonymous_record_with_function; 2543 else if (isa<VarDecl>(*Mem)) 2544 DK = diag::err_anonymous_record_with_static; 2545 2546 // Visual C++ allows type definition in anonymous struct or union. 2547 if (getLangOptions().Microsoft && 2548 DK == diag::err_anonymous_record_with_type) 2549 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2550 << (int)Record->isUnion(); 2551 else { 2552 Diag((*Mem)->getLocation(), DK) 2553 << (int)Record->isUnion(); 2554 Invalid = true; 2555 } 2556 } 2557 } 2558 } 2559 2560 if (!Record->isUnion() && !Owner->isRecord()) { 2561 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2562 << (int)getLangOptions().CPlusPlus; 2563 Invalid = true; 2564 } 2565 2566 // Mock up a declarator. 2567 Declarator Dc(DS, Declarator::TypeNameContext); 2568 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2569 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2570 2571 // Create a declaration for this anonymous struct/union. 2572 NamedDecl *Anon = 0; 2573 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2574 Anon = FieldDecl::Create(Context, OwningClass, 2575 DS.getSourceRange().getBegin(), 2576 Record->getLocation(), 2577 /*IdentifierInfo=*/0, 2578 Context.getTypeDeclType(Record), 2579 TInfo, 2580 /*BitWidth=*/0, /*Mutable=*/false); 2581 Anon->setAccess(AS); 2582 if (getLangOptions().CPlusPlus) 2583 FieldCollector->Add(cast<FieldDecl>(Anon)); 2584 } else { 2585 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2586 assert(SCSpec != DeclSpec::SCS_typedef && 2587 "Parser allowed 'typedef' as storage class VarDecl."); 2588 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2589 if (SCSpec == DeclSpec::SCS_mutable) { 2590 // mutable can only appear on non-static class members, so it's always 2591 // an error here 2592 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2593 Invalid = true; 2594 SC = SC_None; 2595 } 2596 SCSpec = DS.getStorageClassSpecAsWritten(); 2597 VarDecl::StorageClass SCAsWritten 2598 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2599 2600 Anon = VarDecl::Create(Context, Owner, 2601 DS.getSourceRange().getBegin(), 2602 Record->getLocation(), /*IdentifierInfo=*/0, 2603 Context.getTypeDeclType(Record), 2604 TInfo, SC, SCAsWritten); 2605 } 2606 Anon->setImplicit(); 2607 2608 // Add the anonymous struct/union object to the current 2609 // context. We'll be referencing this object when we refer to one of 2610 // its members. 2611 Owner->addDecl(Anon); 2612 2613 // Inject the members of the anonymous struct/union into the owning 2614 // context and into the identifier resolver chain for name lookup 2615 // purposes. 2616 llvm::SmallVector<NamedDecl*, 2> Chain; 2617 Chain.push_back(Anon); 2618 2619 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2620 Chain, false)) 2621 Invalid = true; 2622 2623 // Mark this as an anonymous struct/union type. Note that we do not 2624 // do this until after we have already checked and injected the 2625 // members of this anonymous struct/union type, because otherwise 2626 // the members could be injected twice: once by DeclContext when it 2627 // builds its lookup table, and once by 2628 // InjectAnonymousStructOrUnionMembers. 2629 Record->setAnonymousStructOrUnion(true); 2630 2631 if (Invalid) 2632 Anon->setInvalidDecl(); 2633 2634 return Anon; 2635} 2636 2637/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2638/// Microsoft C anonymous structure. 2639/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2640/// Example: 2641/// 2642/// struct A { int a; }; 2643/// struct B { struct A; int b; }; 2644/// 2645/// void foo() { 2646/// B var; 2647/// var.a = 3; 2648/// } 2649/// 2650Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2651 RecordDecl *Record) { 2652 2653 // If there is no Record, get the record via the typedef. 2654 if (!Record) 2655 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2656 2657 // Mock up a declarator. 2658 Declarator Dc(DS, Declarator::TypeNameContext); 2659 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2660 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2661 2662 // Create a declaration for this anonymous struct. 2663 NamedDecl* Anon = FieldDecl::Create(Context, 2664 cast<RecordDecl>(CurContext), 2665 DS.getSourceRange().getBegin(), 2666 DS.getSourceRange().getBegin(), 2667 /*IdentifierInfo=*/0, 2668 Context.getTypeDeclType(Record), 2669 TInfo, 2670 /*BitWidth=*/0, /*Mutable=*/false); 2671 Anon->setImplicit(); 2672 2673 // Add the anonymous struct object to the current context. 2674 CurContext->addDecl(Anon); 2675 2676 // Inject the members of the anonymous struct into the current 2677 // context and into the identifier resolver chain for name lookup 2678 // purposes. 2679 llvm::SmallVector<NamedDecl*, 2> Chain; 2680 Chain.push_back(Anon); 2681 2682 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2683 Record->getDefinition(), 2684 AS_none, Chain, true)) 2685 Anon->setInvalidDecl(); 2686 2687 return Anon; 2688} 2689 2690/// GetNameForDeclarator - Determine the full declaration name for the 2691/// given Declarator. 2692DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2693 return GetNameFromUnqualifiedId(D.getName()); 2694} 2695 2696/// \brief Retrieves the declaration name from a parsed unqualified-id. 2697DeclarationNameInfo 2698Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2699 DeclarationNameInfo NameInfo; 2700 NameInfo.setLoc(Name.StartLocation); 2701 2702 switch (Name.getKind()) { 2703 2704 case UnqualifiedId::IK_Identifier: 2705 NameInfo.setName(Name.Identifier); 2706 NameInfo.setLoc(Name.StartLocation); 2707 return NameInfo; 2708 2709 case UnqualifiedId::IK_OperatorFunctionId: 2710 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2711 Name.OperatorFunctionId.Operator)); 2712 NameInfo.setLoc(Name.StartLocation); 2713 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2714 = Name.OperatorFunctionId.SymbolLocations[0]; 2715 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2716 = Name.EndLocation.getRawEncoding(); 2717 return NameInfo; 2718 2719 case UnqualifiedId::IK_LiteralOperatorId: 2720 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2721 Name.Identifier)); 2722 NameInfo.setLoc(Name.StartLocation); 2723 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2724 return NameInfo; 2725 2726 case UnqualifiedId::IK_ConversionFunctionId: { 2727 TypeSourceInfo *TInfo; 2728 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2729 if (Ty.isNull()) 2730 return DeclarationNameInfo(); 2731 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2732 Context.getCanonicalType(Ty))); 2733 NameInfo.setLoc(Name.StartLocation); 2734 NameInfo.setNamedTypeInfo(TInfo); 2735 return NameInfo; 2736 } 2737 2738 case UnqualifiedId::IK_ConstructorName: { 2739 TypeSourceInfo *TInfo; 2740 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2741 if (Ty.isNull()) 2742 return DeclarationNameInfo(); 2743 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2744 Context.getCanonicalType(Ty))); 2745 NameInfo.setLoc(Name.StartLocation); 2746 NameInfo.setNamedTypeInfo(TInfo); 2747 return NameInfo; 2748 } 2749 2750 case UnqualifiedId::IK_ConstructorTemplateId: { 2751 // In well-formed code, we can only have a constructor 2752 // template-id that refers to the current context, so go there 2753 // to find the actual type being constructed. 2754 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2755 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2756 return DeclarationNameInfo(); 2757 2758 // Determine the type of the class being constructed. 2759 QualType CurClassType = Context.getTypeDeclType(CurClass); 2760 2761 // FIXME: Check two things: that the template-id names the same type as 2762 // CurClassType, and that the template-id does not occur when the name 2763 // was qualified. 2764 2765 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2766 Context.getCanonicalType(CurClassType))); 2767 NameInfo.setLoc(Name.StartLocation); 2768 // FIXME: should we retrieve TypeSourceInfo? 2769 NameInfo.setNamedTypeInfo(0); 2770 return NameInfo; 2771 } 2772 2773 case UnqualifiedId::IK_DestructorName: { 2774 TypeSourceInfo *TInfo; 2775 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2776 if (Ty.isNull()) 2777 return DeclarationNameInfo(); 2778 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2779 Context.getCanonicalType(Ty))); 2780 NameInfo.setLoc(Name.StartLocation); 2781 NameInfo.setNamedTypeInfo(TInfo); 2782 return NameInfo; 2783 } 2784 2785 case UnqualifiedId::IK_TemplateId: { 2786 TemplateName TName = Name.TemplateId->Template.get(); 2787 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2788 return Context.getNameForTemplate(TName, TNameLoc); 2789 } 2790 2791 } // switch (Name.getKind()) 2792 2793 assert(false && "Unknown name kind"); 2794 return DeclarationNameInfo(); 2795} 2796 2797/// isNearlyMatchingFunction - Determine whether the C++ functions 2798/// Declaration and Definition are "nearly" matching. This heuristic 2799/// is used to improve diagnostics in the case where an out-of-line 2800/// function definition doesn't match any declaration within 2801/// the class or namespace. 2802static bool isNearlyMatchingFunction(ASTContext &Context, 2803 FunctionDecl *Declaration, 2804 FunctionDecl *Definition) { 2805 if (Declaration->param_size() != Definition->param_size()) 2806 return false; 2807 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2808 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2809 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2810 2811 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 2812 DefParamTy.getNonReferenceType())) 2813 return false; 2814 } 2815 2816 return true; 2817} 2818 2819/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2820/// declarator needs to be rebuilt in the current instantiation. 2821/// Any bits of declarator which appear before the name are valid for 2822/// consideration here. That's specifically the type in the decl spec 2823/// and the base type in any member-pointer chunks. 2824static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2825 DeclarationName Name) { 2826 // The types we specifically need to rebuild are: 2827 // - typenames, typeofs, and decltypes 2828 // - types which will become injected class names 2829 // Of course, we also need to rebuild any type referencing such a 2830 // type. It's safest to just say "dependent", but we call out a 2831 // few cases here. 2832 2833 DeclSpec &DS = D.getMutableDeclSpec(); 2834 switch (DS.getTypeSpecType()) { 2835 case DeclSpec::TST_typename: 2836 case DeclSpec::TST_typeofType: 2837 case DeclSpec::TST_decltype: { 2838 // Grab the type from the parser. 2839 TypeSourceInfo *TSI = 0; 2840 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2841 if (T.isNull() || !T->isDependentType()) break; 2842 2843 // Make sure there's a type source info. This isn't really much 2844 // of a waste; most dependent types should have type source info 2845 // attached already. 2846 if (!TSI) 2847 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2848 2849 // Rebuild the type in the current instantiation. 2850 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2851 if (!TSI) return true; 2852 2853 // Store the new type back in the decl spec. 2854 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2855 DS.UpdateTypeRep(LocType); 2856 break; 2857 } 2858 2859 case DeclSpec::TST_typeofExpr: { 2860 Expr *E = DS.getRepAsExpr(); 2861 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2862 if (Result.isInvalid()) return true; 2863 DS.UpdateExprRep(Result.get()); 2864 break; 2865 } 2866 2867 default: 2868 // Nothing to do for these decl specs. 2869 break; 2870 } 2871 2872 // It doesn't matter what order we do this in. 2873 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2874 DeclaratorChunk &Chunk = D.getTypeObject(I); 2875 2876 // The only type information in the declarator which can come 2877 // before the declaration name is the base type of a member 2878 // pointer. 2879 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2880 continue; 2881 2882 // Rebuild the scope specifier in-place. 2883 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2884 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2885 return true; 2886 } 2887 2888 return false; 2889} 2890 2891Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 2892 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), false); 2893} 2894 2895/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 2896/// If T is the name of a class, then each of the following shall have a 2897/// name different from T: 2898/// - every static data member of class T; 2899/// - every member function of class T 2900/// - every member of class T that is itself a type; 2901/// \returns true if the declaration name violates these rules. 2902bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 2903 DeclarationNameInfo NameInfo) { 2904 DeclarationName Name = NameInfo.getName(); 2905 2906 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 2907 if (Record->getIdentifier() && Record->getDeclName() == Name) { 2908 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 2909 return true; 2910 } 2911 2912 return false; 2913} 2914 2915Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 2916 MultiTemplateParamsArg TemplateParamLists, 2917 bool IsFunctionDefinition, 2918 SourceLocation DefLoc) { 2919 // TODO: consider using NameInfo for diagnostic. 2920 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 2921 DeclarationName Name = NameInfo.getName(); 2922 2923 // All of these full declarators require an identifier. If it doesn't have 2924 // one, the ParsedFreeStandingDeclSpec action should be used. 2925 if (!Name) { 2926 if (!D.isInvalidType()) // Reject this if we think it is valid. 2927 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2928 diag::err_declarator_need_ident) 2929 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2930 return 0; 2931 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 2932 return 0; 2933 2934 // The scope passed in may not be a decl scope. Zip up the scope tree until 2935 // we find one that is. 2936 while ((S->getFlags() & Scope::DeclScope) == 0 || 2937 (S->getFlags() & Scope::TemplateParamScope) != 0) 2938 S = S->getParent(); 2939 2940 DeclContext *DC = CurContext; 2941 if (D.getCXXScopeSpec().isInvalid()) 2942 D.setInvalidType(); 2943 else if (D.getCXXScopeSpec().isSet()) { 2944 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 2945 UPPC_DeclarationQualifier)) 2946 return 0; 2947 2948 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2949 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2950 if (!DC) { 2951 // If we could not compute the declaration context, it's because the 2952 // declaration context is dependent but does not refer to a class, 2953 // class template, or class template partial specialization. Complain 2954 // and return early, to avoid the coming semantic disaster. 2955 Diag(D.getIdentifierLoc(), 2956 diag::err_template_qualified_declarator_no_match) 2957 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2958 << D.getCXXScopeSpec().getRange(); 2959 return 0; 2960 } 2961 bool IsDependentContext = DC->isDependentContext(); 2962 2963 if (!IsDependentContext && 2964 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2965 return 0; 2966 2967 if (isa<CXXRecordDecl>(DC)) { 2968 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 2969 Diag(D.getIdentifierLoc(), 2970 diag::err_member_def_undefined_record) 2971 << Name << DC << D.getCXXScopeSpec().getRange(); 2972 D.setInvalidType(); 2973 } else if (isa<CXXRecordDecl>(CurContext) && 2974 !D.getDeclSpec().isFriendSpecified()) { 2975 // The user provided a superfluous scope specifier inside a class 2976 // definition: 2977 // 2978 // class X { 2979 // void X::f(); 2980 // }; 2981 if (CurContext->Equals(DC)) 2982 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 2983 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 2984 else 2985 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 2986 << Name << D.getCXXScopeSpec().getRange(); 2987 2988 // Pretend that this qualifier was not here. 2989 D.getCXXScopeSpec().clear(); 2990 } 2991 } 2992 2993 // Check whether we need to rebuild the type of the given 2994 // declaration in the current instantiation. 2995 if (EnteringContext && IsDependentContext && 2996 TemplateParamLists.size() != 0) { 2997 ContextRAII SavedContext(*this, DC); 2998 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 2999 D.setInvalidType(); 3000 } 3001 } 3002 3003 if (DiagnoseClassNameShadow(DC, NameInfo)) 3004 // If this is a typedef, we'll end up spewing multiple diagnostics. 3005 // Just return early; it's safer. 3006 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3007 return 0; 3008 3009 NamedDecl *New; 3010 3011 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3012 QualType R = TInfo->getType(); 3013 3014 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3015 UPPC_DeclarationType)) 3016 D.setInvalidType(); 3017 3018 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3019 ForRedeclaration); 3020 3021 // See if this is a redefinition of a variable in the same scope. 3022 if (!D.getCXXScopeSpec().isSet()) { 3023 bool IsLinkageLookup = false; 3024 3025 // If the declaration we're planning to build will be a function 3026 // or object with linkage, then look for another declaration with 3027 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3028 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3029 /* Do nothing*/; 3030 else if (R->isFunctionType()) { 3031 if (CurContext->isFunctionOrMethod() || 3032 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3033 IsLinkageLookup = true; 3034 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3035 IsLinkageLookup = true; 3036 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3037 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3038 IsLinkageLookup = true; 3039 3040 if (IsLinkageLookup) 3041 Previous.clear(LookupRedeclarationWithLinkage); 3042 3043 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3044 } else { // Something like "int foo::x;" 3045 LookupQualifiedName(Previous, DC); 3046 3047 // Don't consider using declarations as previous declarations for 3048 // out-of-line members. 3049 RemoveUsingDecls(Previous); 3050 3051 // C++ 7.3.1.2p2: 3052 // Members (including explicit specializations of templates) of a named 3053 // namespace can also be defined outside that namespace by explicit 3054 // qualification of the name being defined, provided that the entity being 3055 // defined was already declared in the namespace and the definition appears 3056 // after the point of declaration in a namespace that encloses the 3057 // declarations namespace. 3058 // 3059 // Note that we only check the context at this point. We don't yet 3060 // have enough information to make sure that PrevDecl is actually 3061 // the declaration we want to match. For example, given: 3062 // 3063 // class X { 3064 // void f(); 3065 // void f(float); 3066 // }; 3067 // 3068 // void X::f(int) { } // ill-formed 3069 // 3070 // In this case, PrevDecl will point to the overload set 3071 // containing the two f's declared in X, but neither of them 3072 // matches. 3073 3074 // First check whether we named the global scope. 3075 if (isa<TranslationUnitDecl>(DC)) { 3076 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3077 << Name << D.getCXXScopeSpec().getRange(); 3078 } else { 3079 DeclContext *Cur = CurContext; 3080 while (isa<LinkageSpecDecl>(Cur)) 3081 Cur = Cur->getParent(); 3082 if (!Cur->Encloses(DC)) { 3083 // The qualifying scope doesn't enclose the original declaration. 3084 // Emit diagnostic based on current scope. 3085 SourceLocation L = D.getIdentifierLoc(); 3086 SourceRange R = D.getCXXScopeSpec().getRange(); 3087 if (isa<FunctionDecl>(Cur)) 3088 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3089 else 3090 Diag(L, diag::err_invalid_declarator_scope) 3091 << Name << cast<NamedDecl>(DC) << R; 3092 D.setInvalidType(); 3093 } 3094 } 3095 } 3096 3097 if (Previous.isSingleResult() && 3098 Previous.getFoundDecl()->isTemplateParameter()) { 3099 // Maybe we will complain about the shadowed template parameter. 3100 if (!D.isInvalidType()) 3101 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3102 Previous.getFoundDecl())) 3103 D.setInvalidType(); 3104 3105 // Just pretend that we didn't see the previous declaration. 3106 Previous.clear(); 3107 } 3108 3109 // In C++, the previous declaration we find might be a tag type 3110 // (class or enum). In this case, the new declaration will hide the 3111 // tag type. Note that this does does not apply if we're declaring a 3112 // typedef (C++ [dcl.typedef]p4). 3113 if (Previous.isSingleTagDecl() && 3114 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3115 Previous.clear(); 3116 3117 bool Redeclaration = false; 3118 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3119 if (DefLoc.isValid()) 3120 Diag(DefLoc, diag::err_default_special_members); 3121 3122 if (TemplateParamLists.size()) { 3123 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3124 return 0; 3125 } 3126 3127 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 3128 } else if (R->isFunctionType()) { 3129 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 3130 move(TemplateParamLists), 3131 IsFunctionDefinition, Redeclaration, DefLoc); 3132 } else { 3133 assert(!DefLoc.isValid() && "We should have caught this in a caller"); 3134 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 3135 move(TemplateParamLists), 3136 Redeclaration); 3137 } 3138 3139 if (New == 0) 3140 return 0; 3141 3142 // If this has an identifier and is not an invalid redeclaration or 3143 // function template specialization, add it to the scope stack. 3144 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl())) 3145 PushOnScopeChains(New, S); 3146 3147 return New; 3148} 3149 3150/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3151/// types into constant array types in certain situations which would otherwise 3152/// be errors (for GCC compatibility). 3153static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3154 ASTContext &Context, 3155 bool &SizeIsNegative, 3156 llvm::APSInt &Oversized) { 3157 // This method tries to turn a variable array into a constant 3158 // array even when the size isn't an ICE. This is necessary 3159 // for compatibility with code that depends on gcc's buggy 3160 // constant expression folding, like struct {char x[(int)(char*)2];} 3161 SizeIsNegative = false; 3162 Oversized = 0; 3163 3164 if (T->isDependentType()) 3165 return QualType(); 3166 3167 QualifierCollector Qs; 3168 const Type *Ty = Qs.strip(T); 3169 3170 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3171 QualType Pointee = PTy->getPointeeType(); 3172 QualType FixedType = 3173 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3174 Oversized); 3175 if (FixedType.isNull()) return FixedType; 3176 FixedType = Context.getPointerType(FixedType); 3177 return Qs.apply(Context, FixedType); 3178 } 3179 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3180 QualType Inner = PTy->getInnerType(); 3181 QualType FixedType = 3182 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3183 Oversized); 3184 if (FixedType.isNull()) return FixedType; 3185 FixedType = Context.getParenType(FixedType); 3186 return Qs.apply(Context, FixedType); 3187 } 3188 3189 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3190 if (!VLATy) 3191 return QualType(); 3192 // FIXME: We should probably handle this case 3193 if (VLATy->getElementType()->isVariablyModifiedType()) 3194 return QualType(); 3195 3196 Expr::EvalResult EvalResult; 3197 if (!VLATy->getSizeExpr() || 3198 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3199 !EvalResult.Val.isInt()) 3200 return QualType(); 3201 3202 // Check whether the array size is negative. 3203 llvm::APSInt &Res = EvalResult.Val.getInt(); 3204 if (Res.isSigned() && Res.isNegative()) { 3205 SizeIsNegative = true; 3206 return QualType(); 3207 } 3208 3209 // Check whether the array is too large to be addressed. 3210 unsigned ActiveSizeBits 3211 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3212 Res); 3213 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3214 Oversized = Res; 3215 return QualType(); 3216 } 3217 3218 return Context.getConstantArrayType(VLATy->getElementType(), 3219 Res, ArrayType::Normal, 0); 3220} 3221 3222/// \brief Register the given locally-scoped external C declaration so 3223/// that it can be found later for redeclarations 3224void 3225Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3226 const LookupResult &Previous, 3227 Scope *S) { 3228 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3229 "Decl is not a locally-scoped decl!"); 3230 // Note that we have a locally-scoped external with this name. 3231 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3232 3233 if (!Previous.isSingleResult()) 3234 return; 3235 3236 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3237 3238 // If there was a previous declaration of this variable, it may be 3239 // in our identifier chain. Update the identifier chain with the new 3240 // declaration. 3241 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3242 // The previous declaration was found on the identifer resolver 3243 // chain, so remove it from its scope. 3244 while (S && !S->isDeclScope(PrevDecl)) 3245 S = S->getParent(); 3246 3247 if (S) 3248 S->RemoveDecl(PrevDecl); 3249 } 3250} 3251 3252/// \brief Diagnose function specifiers on a declaration of an identifier that 3253/// does not identify a function. 3254void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3255 // FIXME: We should probably indicate the identifier in question to avoid 3256 // confusion for constructs like "inline int a(), b;" 3257 if (D.getDeclSpec().isInlineSpecified()) 3258 Diag(D.getDeclSpec().getInlineSpecLoc(), 3259 diag::err_inline_non_function); 3260 3261 if (D.getDeclSpec().isVirtualSpecified()) 3262 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3263 diag::err_virtual_non_function); 3264 3265 if (D.getDeclSpec().isExplicitSpecified()) 3266 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3267 diag::err_explicit_non_function); 3268} 3269 3270NamedDecl* 3271Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3272 QualType R, TypeSourceInfo *TInfo, 3273 LookupResult &Previous, bool &Redeclaration) { 3274 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3275 if (D.getCXXScopeSpec().isSet()) { 3276 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3277 << D.getCXXScopeSpec().getRange(); 3278 D.setInvalidType(); 3279 // Pretend we didn't see the scope specifier. 3280 DC = CurContext; 3281 Previous.clear(); 3282 } 3283 3284 if (getLangOptions().CPlusPlus) { 3285 // Check that there are no default arguments (C++ only). 3286 CheckExtraCXXDefaultArguments(D); 3287 } 3288 3289 DiagnoseFunctionSpecifiers(D); 3290 3291 if (D.getDeclSpec().isThreadSpecified()) 3292 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3293 3294 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3295 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3296 << D.getName().getSourceRange(); 3297 return 0; 3298 } 3299 3300 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 3301 if (!NewTD) return 0; 3302 3303 // Handle attributes prior to checking for duplicates in MergeVarDecl 3304 ProcessDeclAttributes(S, NewTD, D); 3305 3306 CheckTypedefForVariablyModifiedType(S, NewTD); 3307 3308 return ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3309} 3310 3311void 3312Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3313 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3314 // then it shall have block scope. 3315 // Note that variably modified types must be fixed before merging the decl so 3316 // that redeclarations will match. 3317 QualType T = NewTD->getUnderlyingType(); 3318 if (T->isVariablyModifiedType()) { 3319 getCurFunction()->setHasBranchProtectedScope(); 3320 3321 if (S->getFnParent() == 0) { 3322 bool SizeIsNegative; 3323 llvm::APSInt Oversized; 3324 QualType FixedTy = 3325 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3326 Oversized); 3327 if (!FixedTy.isNull()) { 3328 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3329 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3330 } else { 3331 if (SizeIsNegative) 3332 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3333 else if (T->isVariableArrayType()) 3334 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3335 else if (Oversized.getBoolValue()) 3336 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3337 else 3338 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3339 NewTD->setInvalidDecl(); 3340 } 3341 } 3342 } 3343} 3344 3345 3346/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3347/// declares a typedef-name, either using the 'typedef' type specifier or via 3348/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3349NamedDecl* 3350Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3351 LookupResult &Previous, bool &Redeclaration) { 3352 // Merge the decl with the existing one if appropriate. If the decl is 3353 // in an outer scope, it isn't the same thing. 3354 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3355 /*ExplicitInstantiationOrSpecialization=*/false); 3356 if (!Previous.empty()) { 3357 Redeclaration = true; 3358 MergeTypedefNameDecl(NewTD, Previous); 3359 } 3360 3361 // If this is the C FILE type, notify the AST context. 3362 if (IdentifierInfo *II = NewTD->getIdentifier()) 3363 if (!NewTD->isInvalidDecl() && 3364 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3365 if (II->isStr("FILE")) 3366 Context.setFILEDecl(NewTD); 3367 else if (II->isStr("jmp_buf")) 3368 Context.setjmp_bufDecl(NewTD); 3369 else if (II->isStr("sigjmp_buf")) 3370 Context.setsigjmp_bufDecl(NewTD); 3371 else if (II->isStr("__builtin_va_list")) 3372 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3373 } 3374 3375 return NewTD; 3376} 3377 3378/// \brief Determines whether the given declaration is an out-of-scope 3379/// previous declaration. 3380/// 3381/// This routine should be invoked when name lookup has found a 3382/// previous declaration (PrevDecl) that is not in the scope where a 3383/// new declaration by the same name is being introduced. If the new 3384/// declaration occurs in a local scope, previous declarations with 3385/// linkage may still be considered previous declarations (C99 3386/// 6.2.2p4-5, C++ [basic.link]p6). 3387/// 3388/// \param PrevDecl the previous declaration found by name 3389/// lookup 3390/// 3391/// \param DC the context in which the new declaration is being 3392/// declared. 3393/// 3394/// \returns true if PrevDecl is an out-of-scope previous declaration 3395/// for a new delcaration with the same name. 3396static bool 3397isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3398 ASTContext &Context) { 3399 if (!PrevDecl) 3400 return false; 3401 3402 if (!PrevDecl->hasLinkage()) 3403 return false; 3404 3405 if (Context.getLangOptions().CPlusPlus) { 3406 // C++ [basic.link]p6: 3407 // If there is a visible declaration of an entity with linkage 3408 // having the same name and type, ignoring entities declared 3409 // outside the innermost enclosing namespace scope, the block 3410 // scope declaration declares that same entity and receives the 3411 // linkage of the previous declaration. 3412 DeclContext *OuterContext = DC->getRedeclContext(); 3413 if (!OuterContext->isFunctionOrMethod()) 3414 // This rule only applies to block-scope declarations. 3415 return false; 3416 3417 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3418 if (PrevOuterContext->isRecord()) 3419 // We found a member function: ignore it. 3420 return false; 3421 3422 // Find the innermost enclosing namespace for the new and 3423 // previous declarations. 3424 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3425 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3426 3427 // The previous declaration is in a different namespace, so it 3428 // isn't the same function. 3429 if (!OuterContext->Equals(PrevOuterContext)) 3430 return false; 3431 } 3432 3433 return true; 3434} 3435 3436static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3437 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3438 if (!SS.isSet()) return; 3439 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3440} 3441 3442NamedDecl* 3443Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3444 QualType R, TypeSourceInfo *TInfo, 3445 LookupResult &Previous, 3446 MultiTemplateParamsArg TemplateParamLists, 3447 bool &Redeclaration) { 3448 DeclarationName Name = GetNameForDeclarator(D).getName(); 3449 3450 // Check that there are no default arguments (C++ only). 3451 if (getLangOptions().CPlusPlus) 3452 CheckExtraCXXDefaultArguments(D); 3453 3454 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3455 assert(SCSpec != DeclSpec::SCS_typedef && 3456 "Parser allowed 'typedef' as storage class VarDecl."); 3457 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3458 if (SCSpec == DeclSpec::SCS_mutable) { 3459 // mutable can only appear on non-static class members, so it's always 3460 // an error here 3461 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3462 D.setInvalidType(); 3463 SC = SC_None; 3464 } 3465 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3466 VarDecl::StorageClass SCAsWritten 3467 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3468 3469 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3470 if (!II) { 3471 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3472 << Name.getAsString(); 3473 return 0; 3474 } 3475 3476 DiagnoseFunctionSpecifiers(D); 3477 3478 if (!DC->isRecord() && S->getFnParent() == 0) { 3479 // C99 6.9p2: The storage-class specifiers auto and register shall not 3480 // appear in the declaration specifiers in an external declaration. 3481 if (SC == SC_Auto || SC == SC_Register) { 3482 3483 // If this is a register variable with an asm label specified, then this 3484 // is a GNU extension. 3485 if (SC == SC_Register && D.getAsmLabel()) 3486 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3487 else 3488 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3489 D.setInvalidType(); 3490 } 3491 } 3492 3493 bool isExplicitSpecialization = false; 3494 VarDecl *NewVD; 3495 if (!getLangOptions().CPlusPlus) { 3496 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3497 D.getIdentifierLoc(), II, 3498 R, TInfo, SC, SCAsWritten); 3499 3500 if (D.isInvalidType()) 3501 NewVD->setInvalidDecl(); 3502 } else { 3503 if (DC->isRecord() && !CurContext->isRecord()) { 3504 // This is an out-of-line definition of a static data member. 3505 if (SC == SC_Static) { 3506 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3507 diag::err_static_out_of_line) 3508 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3509 } else if (SC == SC_None) 3510 SC = SC_Static; 3511 } 3512 if (SC == SC_Static) { 3513 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3514 if (RD->isLocalClass()) 3515 Diag(D.getIdentifierLoc(), 3516 diag::err_static_data_member_not_allowed_in_local_class) 3517 << Name << RD->getDeclName(); 3518 3519 // C++ [class.union]p1: If a union contains a static data member, 3520 // the program is ill-formed. 3521 // 3522 // We also disallow static data members in anonymous structs. 3523 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3524 Diag(D.getIdentifierLoc(), 3525 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3526 << Name << RD->isUnion(); 3527 } 3528 } 3529 3530 // Match up the template parameter lists with the scope specifier, then 3531 // determine whether we have a template or a template specialization. 3532 isExplicitSpecialization = false; 3533 bool Invalid = false; 3534 if (TemplateParameterList *TemplateParams 3535 = MatchTemplateParametersToScopeSpecifier( 3536 D.getDeclSpec().getSourceRange().getBegin(), 3537 D.getCXXScopeSpec(), 3538 TemplateParamLists.get(), 3539 TemplateParamLists.size(), 3540 /*never a friend*/ false, 3541 isExplicitSpecialization, 3542 Invalid)) { 3543 if (TemplateParams->size() > 0) { 3544 // There is no such thing as a variable template. 3545 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3546 << II 3547 << SourceRange(TemplateParams->getTemplateLoc(), 3548 TemplateParams->getRAngleLoc()); 3549 return 0; 3550 } else { 3551 // There is an extraneous 'template<>' for this variable. Complain 3552 // about it, but allow the declaration of the variable. 3553 Diag(TemplateParams->getTemplateLoc(), 3554 diag::err_template_variable_noparams) 3555 << II 3556 << SourceRange(TemplateParams->getTemplateLoc(), 3557 TemplateParams->getRAngleLoc()); 3558 isExplicitSpecialization = true; 3559 } 3560 } 3561 3562 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3563 D.getIdentifierLoc(), II, 3564 R, TInfo, SC, SCAsWritten); 3565 3566 // If this decl has an auto type in need of deduction, make a note of the 3567 // Decl so we can diagnose uses of it in its own initializer. 3568 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3569 R->getContainedAutoType()) 3570 ParsingInitForAutoVars.insert(NewVD); 3571 3572 if (D.isInvalidType() || Invalid) 3573 NewVD->setInvalidDecl(); 3574 3575 SetNestedNameSpecifier(NewVD, D); 3576 3577 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3578 NewVD->setTemplateParameterListsInfo(Context, 3579 TemplateParamLists.size(), 3580 TemplateParamLists.release()); 3581 } 3582 } 3583 3584 if (D.getDeclSpec().isThreadSpecified()) { 3585 if (NewVD->hasLocalStorage()) 3586 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3587 else if (!Context.Target.isTLSSupported()) 3588 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3589 else 3590 NewVD->setThreadSpecified(true); 3591 } 3592 3593 // Set the lexical context. If the declarator has a C++ scope specifier, the 3594 // lexical context will be different from the semantic context. 3595 NewVD->setLexicalDeclContext(CurContext); 3596 3597 // Handle attributes prior to checking for duplicates in MergeVarDecl 3598 ProcessDeclAttributes(S, NewVD, D); 3599 3600 // Handle GNU asm-label extension (encoded as an attribute). 3601 if (Expr *E = (Expr*)D.getAsmLabel()) { 3602 // The parser guarantees this is a string. 3603 StringLiteral *SE = cast<StringLiteral>(E); 3604 llvm::StringRef Label = SE->getString(); 3605 if (S->getFnParent() != 0) { 3606 switch (SC) { 3607 case SC_None: 3608 case SC_Auto: 3609 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3610 break; 3611 case SC_Register: 3612 if (!Context.Target.isValidGCCRegisterName(Label)) 3613 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3614 break; 3615 case SC_Static: 3616 case SC_Extern: 3617 case SC_PrivateExtern: 3618 break; 3619 } 3620 } 3621 3622 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3623 Context, Label)); 3624 } 3625 3626 // Diagnose shadowed variables before filtering for scope. 3627 if (!D.getCXXScopeSpec().isSet()) 3628 CheckShadow(S, NewVD, Previous); 3629 3630 // Don't consider existing declarations that are in a different 3631 // scope and are out-of-semantic-context declarations (if the new 3632 // declaration has linkage). 3633 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 3634 isExplicitSpecialization); 3635 3636 if (!getLangOptions().CPlusPlus) 3637 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3638 else { 3639 // Merge the decl with the existing one if appropriate. 3640 if (!Previous.empty()) { 3641 if (Previous.isSingleResult() && 3642 isa<FieldDecl>(Previous.getFoundDecl()) && 3643 D.getCXXScopeSpec().isSet()) { 3644 // The user tried to define a non-static data member 3645 // out-of-line (C++ [dcl.meaning]p1). 3646 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3647 << D.getCXXScopeSpec().getRange(); 3648 Previous.clear(); 3649 NewVD->setInvalidDecl(); 3650 } 3651 } else if (D.getCXXScopeSpec().isSet()) { 3652 // No previous declaration in the qualifying scope. 3653 Diag(D.getIdentifierLoc(), diag::err_no_member) 3654 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3655 << D.getCXXScopeSpec().getRange(); 3656 NewVD->setInvalidDecl(); 3657 } 3658 3659 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3660 3661 // This is an explicit specialization of a static data member. Check it. 3662 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3663 CheckMemberSpecialization(NewVD, Previous)) 3664 NewVD->setInvalidDecl(); 3665 } 3666 3667 // attributes declared post-definition are currently ignored 3668 // FIXME: This should be handled in attribute merging, not 3669 // here. 3670 if (Previous.isSingleResult()) { 3671 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3672 if (Def && (Def = Def->getDefinition()) && 3673 Def != NewVD && D.hasAttributes()) { 3674 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3675 Diag(Def->getLocation(), diag::note_previous_definition); 3676 } 3677 } 3678 3679 // If this is a locally-scoped extern C variable, update the map of 3680 // such variables. 3681 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3682 !NewVD->isInvalidDecl()) 3683 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3684 3685 // If there's a #pragma GCC visibility in scope, and this isn't a class 3686 // member, set the visibility of this variable. 3687 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3688 AddPushedVisibilityAttribute(NewVD); 3689 3690 MarkUnusedFileScopedDecl(NewVD); 3691 3692 return NewVD; 3693} 3694 3695/// \brief Diagnose variable or built-in function shadowing. Implements 3696/// -Wshadow. 3697/// 3698/// This method is called whenever a VarDecl is added to a "useful" 3699/// scope. 3700/// 3701/// \param S the scope in which the shadowing name is being declared 3702/// \param R the lookup of the name 3703/// 3704void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 3705 // Return if warning is ignored. 3706 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 3707 Diagnostic::Ignored) 3708 return; 3709 3710 // Don't diagnose declarations at file scope. 3711 if (D->hasGlobalStorage()) 3712 return; 3713 3714 DeclContext *NewDC = D->getDeclContext(); 3715 3716 // Only diagnose if we're shadowing an unambiguous field or variable. 3717 if (R.getResultKind() != LookupResult::Found) 3718 return; 3719 3720 NamedDecl* ShadowedDecl = R.getFoundDecl(); 3721 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 3722 return; 3723 3724 // Fields are not shadowed by variables in C++ static methods. 3725 if (isa<FieldDecl>(ShadowedDecl)) 3726 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 3727 if (MD->isStatic()) 3728 return; 3729 3730 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 3731 if (shadowedVar->isExternC()) { 3732 // For shadowing external vars, make sure that we point to the global 3733 // declaration, not a locally scoped extern declaration. 3734 for (VarDecl::redecl_iterator 3735 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 3736 I != E; ++I) 3737 if (I->isFileVarDecl()) { 3738 ShadowedDecl = *I; 3739 break; 3740 } 3741 } 3742 3743 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 3744 3745 // Only warn about certain kinds of shadowing for class members. 3746 if (NewDC && NewDC->isRecord()) { 3747 // In particular, don't warn about shadowing non-class members. 3748 if (!OldDC->isRecord()) 3749 return; 3750 3751 // TODO: should we warn about static data members shadowing 3752 // static data members from base classes? 3753 3754 // TODO: don't diagnose for inaccessible shadowed members. 3755 // This is hard to do perfectly because we might friend the 3756 // shadowing context, but that's just a false negative. 3757 } 3758 3759 // Determine what kind of declaration we're shadowing. 3760 unsigned Kind; 3761 if (isa<RecordDecl>(OldDC)) { 3762 if (isa<FieldDecl>(ShadowedDecl)) 3763 Kind = 3; // field 3764 else 3765 Kind = 2; // static data member 3766 } else if (OldDC->isFileContext()) 3767 Kind = 1; // global 3768 else 3769 Kind = 0; // local 3770 3771 DeclarationName Name = R.getLookupName(); 3772 3773 // Emit warning and note. 3774 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 3775 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 3776} 3777 3778/// \brief Check -Wshadow without the advantage of a previous lookup. 3779void Sema::CheckShadow(Scope *S, VarDecl *D) { 3780 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 3781 Diagnostic::Ignored) 3782 return; 3783 3784 LookupResult R(*this, D->getDeclName(), D->getLocation(), 3785 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 3786 LookupName(R, S); 3787 CheckShadow(S, D, R); 3788} 3789 3790/// \brief Perform semantic checking on a newly-created variable 3791/// declaration. 3792/// 3793/// This routine performs all of the type-checking required for a 3794/// variable declaration once it has been built. It is used both to 3795/// check variables after they have been parsed and their declarators 3796/// have been translated into a declaration, and to check variables 3797/// that have been instantiated from a template. 3798/// 3799/// Sets NewVD->isInvalidDecl() if an error was encountered. 3800void Sema::CheckVariableDeclaration(VarDecl *NewVD, 3801 LookupResult &Previous, 3802 bool &Redeclaration) { 3803 // If the decl is already known invalid, don't check it. 3804 if (NewVD->isInvalidDecl()) 3805 return; 3806 3807 QualType T = NewVD->getType(); 3808 3809 if (T->isObjCObjectType()) { 3810 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 3811 return NewVD->setInvalidDecl(); 3812 } 3813 3814 // Emit an error if an address space was applied to decl with local storage. 3815 // This includes arrays of objects with address space qualifiers, but not 3816 // automatic variables that point to other address spaces. 3817 // ISO/IEC TR 18037 S5.1.2 3818 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 3819 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 3820 return NewVD->setInvalidDecl(); 3821 } 3822 3823 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 3824 && !NewVD->hasAttr<BlocksAttr>()) 3825 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 3826 3827 bool isVM = T->isVariablyModifiedType(); 3828 if (isVM || NewVD->hasAttr<CleanupAttr>() || 3829 NewVD->hasAttr<BlocksAttr>()) 3830 getCurFunction()->setHasBranchProtectedScope(); 3831 3832 if ((isVM && NewVD->hasLinkage()) || 3833 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 3834 bool SizeIsNegative; 3835 llvm::APSInt Oversized; 3836 QualType FixedTy = 3837 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3838 Oversized); 3839 3840 if (FixedTy.isNull() && T->isVariableArrayType()) { 3841 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 3842 // FIXME: This won't give the correct result for 3843 // int a[10][n]; 3844 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 3845 3846 if (NewVD->isFileVarDecl()) 3847 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 3848 << SizeRange; 3849 else if (NewVD->getStorageClass() == SC_Static) 3850 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 3851 << SizeRange; 3852 else 3853 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 3854 << SizeRange; 3855 return NewVD->setInvalidDecl(); 3856 } 3857 3858 if (FixedTy.isNull()) { 3859 if (NewVD->isFileVarDecl()) 3860 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 3861 else 3862 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 3863 return NewVD->setInvalidDecl(); 3864 } 3865 3866 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 3867 NewVD->setType(FixedTy); 3868 } 3869 3870 if (Previous.empty() && NewVD->isExternC()) { 3871 // Since we did not find anything by this name and we're declaring 3872 // an extern "C" variable, look for a non-visible extern "C" 3873 // declaration with the same name. 3874 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3875 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 3876 if (Pos != LocallyScopedExternalDecls.end()) 3877 Previous.addDecl(Pos->second); 3878 } 3879 3880 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 3881 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 3882 << T; 3883 return NewVD->setInvalidDecl(); 3884 } 3885 3886 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 3887 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 3888 return NewVD->setInvalidDecl(); 3889 } 3890 3891 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 3892 Diag(NewVD->getLocation(), diag::err_block_on_vm); 3893 return NewVD->setInvalidDecl(); 3894 } 3895 3896 // Function pointers and references cannot have qualified function type, only 3897 // function pointer-to-members can do that. 3898 QualType Pointee; 3899 unsigned PtrOrRef = 0; 3900 if (const PointerType *Ptr = T->getAs<PointerType>()) 3901 Pointee = Ptr->getPointeeType(); 3902 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 3903 Pointee = Ref->getPointeeType(); 3904 PtrOrRef = 1; 3905 } 3906 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 3907 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 3908 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 3909 << PtrOrRef; 3910 return NewVD->setInvalidDecl(); 3911 } 3912 3913 if (!Previous.empty()) { 3914 Redeclaration = true; 3915 MergeVarDecl(NewVD, Previous); 3916 } 3917} 3918 3919/// \brief Data used with FindOverriddenMethod 3920struct FindOverriddenMethodData { 3921 Sema *S; 3922 CXXMethodDecl *Method; 3923}; 3924 3925/// \brief Member lookup function that determines whether a given C++ 3926/// method overrides a method in a base class, to be used with 3927/// CXXRecordDecl::lookupInBases(). 3928static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 3929 CXXBasePath &Path, 3930 void *UserData) { 3931 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3932 3933 FindOverriddenMethodData *Data 3934 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 3935 3936 DeclarationName Name = Data->Method->getDeclName(); 3937 3938 // FIXME: Do we care about other names here too? 3939 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3940 // We really want to find the base class destructor here. 3941 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 3942 CanQualType CT = Data->S->Context.getCanonicalType(T); 3943 3944 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 3945 } 3946 3947 for (Path.Decls = BaseRecord->lookup(Name); 3948 Path.Decls.first != Path.Decls.second; 3949 ++Path.Decls.first) { 3950 NamedDecl *D = *Path.Decls.first; 3951 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3952 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 3953 return true; 3954 } 3955 } 3956 3957 return false; 3958} 3959 3960/// AddOverriddenMethods - See if a method overrides any in the base classes, 3961/// and if so, check that it's a valid override and remember it. 3962bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3963 // Look for virtual methods in base classes that this method might override. 3964 CXXBasePaths Paths; 3965 FindOverriddenMethodData Data; 3966 Data.Method = MD; 3967 Data.S = this; 3968 bool AddedAny = false; 3969 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 3970 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 3971 E = Paths.found_decls_end(); I != E; ++I) { 3972 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 3973 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 3974 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 3975 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 3976 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 3977 AddedAny = true; 3978 } 3979 } 3980 } 3981 } 3982 3983 return AddedAny; 3984} 3985 3986static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD) { 3987 LookupResult Prev(S, NewFD->getDeclName(), NewFD->getLocation(), 3988 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 3989 S.LookupQualifiedName(Prev, NewFD->getDeclContext()); 3990 assert(!Prev.isAmbiguous() && 3991 "Cannot have an ambiguity in previous-declaration lookup"); 3992 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3993 Func != FuncEnd; ++Func) { 3994 if (isa<FunctionDecl>(*Func) && 3995 isNearlyMatchingFunction(S.Context, cast<FunctionDecl>(*Func), NewFD)) 3996 S.Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3997 } 3998} 3999 4000NamedDecl* 4001Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 4002 QualType R, TypeSourceInfo *TInfo, 4003 LookupResult &Previous, 4004 MultiTemplateParamsArg TemplateParamLists, 4005 bool IsFunctionDefinition, bool &Redeclaration, 4006 SourceLocation DefLoc) { 4007 assert(R.getTypePtr()->isFunctionType()); 4008 4009 // TODO: consider using NameInfo for diagnostic. 4010 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4011 DeclarationName Name = NameInfo.getName(); 4012 FunctionDecl::StorageClass SC = SC_None; 4013 switch (D.getDeclSpec().getStorageClassSpec()) { 4014 default: assert(0 && "Unknown storage class!"); 4015 case DeclSpec::SCS_auto: 4016 case DeclSpec::SCS_register: 4017 case DeclSpec::SCS_mutable: 4018 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4019 diag::err_typecheck_sclass_func); 4020 D.setInvalidType(); 4021 break; 4022 case DeclSpec::SCS_unspecified: SC = SC_None; break; 4023 case DeclSpec::SCS_extern: SC = SC_Extern; break; 4024 case DeclSpec::SCS_static: { 4025 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 4026 // C99 6.7.1p5: 4027 // The declaration of an identifier for a function that has 4028 // block scope shall have no explicit storage-class specifier 4029 // other than extern 4030 // See also (C++ [dcl.stc]p4). 4031 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4032 diag::err_static_block_func); 4033 SC = SC_None; 4034 } else 4035 SC = SC_Static; 4036 break; 4037 } 4038 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 4039 } 4040 4041 if (D.getDeclSpec().isThreadSpecified()) 4042 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4043 4044 // Do not allow returning a objc interface by-value. 4045 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4046 Diag(D.getIdentifierLoc(), 4047 diag::err_object_cannot_be_passed_returned_by_value) << 0 4048 << R->getAs<FunctionType>()->getResultType(); 4049 D.setInvalidType(); 4050 } 4051 4052 FunctionDecl *NewFD; 4053 bool isInline = D.getDeclSpec().isInlineSpecified(); 4054 bool isFriend = false; 4055 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4056 FunctionDecl::StorageClass SCAsWritten 4057 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4058 FunctionTemplateDecl *FunctionTemplate = 0; 4059 bool isExplicitSpecialization = false; 4060 bool isFunctionTemplateSpecialization = false; 4061 4062 if (!getLangOptions().CPlusPlus) { 4063 assert(!DefLoc.isValid() && "Defaulted functions are a C++ feature"); 4064 4065 // Determine whether the function was written with a 4066 // prototype. This true when: 4067 // - there is a prototype in the declarator, or 4068 // - the type R of the function is some kind of typedef or other reference 4069 // to a type name (which eventually refers to a function type). 4070 bool HasPrototype = 4071 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4072 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4073 4074 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4075 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4076 HasPrototype); 4077 if (D.isInvalidType()) 4078 NewFD->setInvalidDecl(); 4079 4080 // Set the lexical context. 4081 NewFD->setLexicalDeclContext(CurContext); 4082 // Filter out previous declarations that don't match the scope. 4083 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4084 /*ExplicitInstantiationOrSpecialization=*/false); 4085 } else { 4086 isFriend = D.getDeclSpec().isFriendSpecified(); 4087 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4088 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4089 bool isVirtualOkay = false; 4090 4091 // Check that the return type is not an abstract class type. 4092 // For record types, this is done by the AbstractClassUsageDiagnoser once 4093 // the class has been completely parsed. 4094 if (!DC->isRecord() && 4095 RequireNonAbstractType(D.getIdentifierLoc(), 4096 R->getAs<FunctionType>()->getResultType(), 4097 diag::err_abstract_type_in_decl, 4098 AbstractReturnType)) 4099 D.setInvalidType(); 4100 4101 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4102 // This is a C++ constructor declaration. 4103 assert(DC->isRecord() && 4104 "Constructors can only be declared in a member context"); 4105 4106 R = CheckConstructorDeclarator(D, R, SC); 4107 4108 // Create the new declaration 4109 CXXConstructorDecl *NewCD = CXXConstructorDecl::Create( 4110 Context, 4111 cast<CXXRecordDecl>(DC), 4112 D.getSourceRange().getBegin(), 4113 NameInfo, R, TInfo, 4114 isExplicit, isInline, 4115 /*isImplicitlyDeclared=*/false); 4116 4117 NewFD = NewCD; 4118 4119 if (DefLoc.isValid()) { 4120 if (NewCD->isDefaultConstructor() || 4121 NewCD->isCopyOrMoveConstructor()) { 4122 NewFD->setDefaulted(); 4123 NewFD->setExplicitlyDefaulted(); 4124 } else { 4125 Diag(DefLoc, diag::err_default_special_members); 4126 } 4127 } 4128 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4129 // This is a C++ destructor declaration. 4130 if (DC->isRecord()) { 4131 R = CheckDestructorDeclarator(D, R, SC); 4132 4133 NewFD = CXXDestructorDecl::Create(Context, 4134 cast<CXXRecordDecl>(DC), 4135 D.getSourceRange().getBegin(), 4136 NameInfo, R, TInfo, 4137 isInline, 4138 /*isImplicitlyDeclared=*/false); 4139 isVirtualOkay = true; 4140 4141 if (DefLoc.isValid()) { 4142 NewFD->setDefaulted(); 4143 NewFD->setExplicitlyDefaulted(); 4144 } 4145 } else { 4146 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4147 4148 // Create a FunctionDecl to satisfy the function definition parsing 4149 // code path. 4150 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4151 D.getIdentifierLoc(), Name, R, TInfo, 4152 SC, SCAsWritten, isInline, 4153 /*hasPrototype=*/true); 4154 D.setInvalidType(); 4155 } 4156 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4157 if (!DC->isRecord()) { 4158 Diag(D.getIdentifierLoc(), 4159 diag::err_conv_function_not_member); 4160 return 0; 4161 } 4162 4163 if (DefLoc.isValid()) 4164 Diag(DefLoc, diag::err_default_special_members); 4165 4166 CheckConversionDeclarator(D, R, SC); 4167 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 4168 D.getSourceRange().getBegin(), 4169 NameInfo, R, TInfo, 4170 isInline, isExplicit, 4171 SourceLocation()); 4172 4173 isVirtualOkay = true; 4174 } else if (DC->isRecord()) { 4175 // If the of the function is the same as the name of the record, then this 4176 // must be an invalid constructor that has a return type. 4177 // (The parser checks for a return type and makes the declarator a 4178 // constructor if it has no return type). 4179 // must have an invalid constructor that has a return type 4180 if (Name.getAsIdentifierInfo() && 4181 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4182 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4183 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4184 << SourceRange(D.getIdentifierLoc()); 4185 return 0; 4186 } 4187 4188 bool isStatic = SC == SC_Static; 4189 4190 // [class.free]p1: 4191 // Any allocation function for a class T is a static member 4192 // (even if not explicitly declared static). 4193 if (Name.getCXXOverloadedOperator() == OO_New || 4194 Name.getCXXOverloadedOperator() == OO_Array_New) 4195 isStatic = true; 4196 4197 // [class.free]p6 Any deallocation function for a class X is a static member 4198 // (even if not explicitly declared static). 4199 if (Name.getCXXOverloadedOperator() == OO_Delete || 4200 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4201 isStatic = true; 4202 4203 // This is a C++ method declaration. 4204 CXXMethodDecl *NewMD = CXXMethodDecl::Create( 4205 Context, cast<CXXRecordDecl>(DC), 4206 D.getSourceRange().getBegin(), 4207 NameInfo, R, TInfo, 4208 isStatic, SCAsWritten, isInline, 4209 SourceLocation()); 4210 NewFD = NewMD; 4211 4212 isVirtualOkay = !isStatic; 4213 4214 if (DefLoc.isValid()) { 4215 if (NewMD->isCopyAssignmentOperator() /* || 4216 NewMD->isMoveAssignmentOperator() */) { 4217 NewFD->setDefaulted(); 4218 NewFD->setExplicitlyDefaulted(); 4219 } else { 4220 Diag(DefLoc, diag::err_default_special_members); 4221 } 4222 } 4223 } else { 4224 if (DefLoc.isValid()) 4225 Diag(DefLoc, diag::err_default_special_members); 4226 4227 // Determine whether the function was written with a 4228 // prototype. This true when: 4229 // - we're in C++ (where every function has a prototype), 4230 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4231 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4232 true/*HasPrototype*/); 4233 } 4234 4235 if (isFriend && !isInline && IsFunctionDefinition) { 4236 // C++ [class.friend]p5 4237 // A function can be defined in a friend declaration of a 4238 // class . . . . Such a function is implicitly inline. 4239 NewFD->setImplicitlyInline(); 4240 } 4241 4242 SetNestedNameSpecifier(NewFD, D); 4243 isExplicitSpecialization = false; 4244 isFunctionTemplateSpecialization = false; 4245 if (D.isInvalidType()) 4246 NewFD->setInvalidDecl(); 4247 4248 // Set the lexical context. If the declarator has a C++ 4249 // scope specifier, or is the object of a friend declaration, the 4250 // lexical context will be different from the semantic context. 4251 NewFD->setLexicalDeclContext(CurContext); 4252 4253 // Match up the template parameter lists with the scope specifier, then 4254 // determine whether we have a template or a template specialization. 4255 bool Invalid = false; 4256 if (TemplateParameterList *TemplateParams 4257 = MatchTemplateParametersToScopeSpecifier( 4258 D.getDeclSpec().getSourceRange().getBegin(), 4259 D.getCXXScopeSpec(), 4260 TemplateParamLists.get(), 4261 TemplateParamLists.size(), 4262 isFriend, 4263 isExplicitSpecialization, 4264 Invalid)) { 4265 if (TemplateParams->size() > 0) { 4266 // This is a function template 4267 4268 // Check that we can declare a template here. 4269 if (CheckTemplateDeclScope(S, TemplateParams)) 4270 return 0; 4271 4272 // A destructor cannot be a template. 4273 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4274 Diag(NewFD->getLocation(), diag::err_destructor_template); 4275 return 0; 4276 } 4277 4278 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4279 NewFD->getLocation(), 4280 Name, TemplateParams, 4281 NewFD); 4282 FunctionTemplate->setLexicalDeclContext(CurContext); 4283 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4284 4285 // For source fidelity, store the other template param lists. 4286 if (TemplateParamLists.size() > 1) { 4287 NewFD->setTemplateParameterListsInfo(Context, 4288 TemplateParamLists.size() - 1, 4289 TemplateParamLists.release()); 4290 } 4291 } else { 4292 // This is a function template specialization. 4293 isFunctionTemplateSpecialization = true; 4294 // For source fidelity, store all the template param lists. 4295 NewFD->setTemplateParameterListsInfo(Context, 4296 TemplateParamLists.size(), 4297 TemplateParamLists.release()); 4298 4299 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4300 if (isFriend) { 4301 // We want to remove the "template<>", found here. 4302 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4303 4304 // If we remove the template<> and the name is not a 4305 // template-id, we're actually silently creating a problem: 4306 // the friend declaration will refer to an untemplated decl, 4307 // and clearly the user wants a template specialization. So 4308 // we need to insert '<>' after the name. 4309 SourceLocation InsertLoc; 4310 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4311 InsertLoc = D.getName().getSourceRange().getEnd(); 4312 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4313 } 4314 4315 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4316 << Name << RemoveRange 4317 << FixItHint::CreateRemoval(RemoveRange) 4318 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4319 } 4320 } 4321 } 4322 else { 4323 // All template param lists were matched against the scope specifier: 4324 // this is NOT (an explicit specialization of) a template. 4325 if (TemplateParamLists.size() > 0) 4326 // For source fidelity, store all the template param lists. 4327 NewFD->setTemplateParameterListsInfo(Context, 4328 TemplateParamLists.size(), 4329 TemplateParamLists.release()); 4330 } 4331 4332 if (Invalid) { 4333 NewFD->setInvalidDecl(); 4334 if (FunctionTemplate) 4335 FunctionTemplate->setInvalidDecl(); 4336 } 4337 4338 // C++ [dcl.fct.spec]p5: 4339 // The virtual specifier shall only be used in declarations of 4340 // nonstatic class member functions that appear within a 4341 // member-specification of a class declaration; see 10.3. 4342 // 4343 if (isVirtual && !NewFD->isInvalidDecl()) { 4344 if (!isVirtualOkay) { 4345 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4346 diag::err_virtual_non_function); 4347 } else if (!CurContext->isRecord()) { 4348 // 'virtual' was specified outside of the class. 4349 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4350 diag::err_virtual_out_of_class) 4351 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4352 } else if (NewFD->getDescribedFunctionTemplate()) { 4353 // C++ [temp.mem]p3: 4354 // A member function template shall not be virtual. 4355 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4356 diag::err_virtual_member_function_template) 4357 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4358 } else { 4359 // Okay: Add virtual to the method. 4360 NewFD->setVirtualAsWritten(true); 4361 } 4362 } 4363 4364 // C++ [dcl.fct.spec]p3: 4365 // The inline specifier shall not appear on a block scope function declaration. 4366 if (isInline && !NewFD->isInvalidDecl()) { 4367 if (CurContext->isFunctionOrMethod()) { 4368 // 'inline' is not allowed on block scope function declaration. 4369 Diag(D.getDeclSpec().getInlineSpecLoc(), 4370 diag::err_inline_declaration_block_scope) << Name 4371 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4372 } 4373 } 4374 4375 // C++ [dcl.fct.spec]p6: 4376 // The explicit specifier shall be used only in the declaration of a 4377 // constructor or conversion function within its class definition; see 12.3.1 4378 // and 12.3.2. 4379 if (isExplicit && !NewFD->isInvalidDecl()) { 4380 if (!CurContext->isRecord()) { 4381 // 'explicit' was specified outside of the class. 4382 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4383 diag::err_explicit_out_of_class) 4384 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4385 } else if (!isa<CXXConstructorDecl>(NewFD) && 4386 !isa<CXXConversionDecl>(NewFD)) { 4387 // 'explicit' was specified on a function that wasn't a constructor 4388 // or conversion function. 4389 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4390 diag::err_explicit_non_ctor_or_conv_function) 4391 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4392 } 4393 } 4394 4395 // Filter out previous declarations that don't match the scope. 4396 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4397 isExplicitSpecialization || 4398 isFunctionTemplateSpecialization); 4399 4400 if (isFriend) { 4401 // For now, claim that the objects have no previous declaration. 4402 if (FunctionTemplate) { 4403 FunctionTemplate->setObjectOfFriendDecl(false); 4404 FunctionTemplate->setAccess(AS_public); 4405 } 4406 NewFD->setObjectOfFriendDecl(false); 4407 NewFD->setAccess(AS_public); 4408 } 4409 4410 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 4411 // A method is implicitly inline if it's defined in its class 4412 // definition. 4413 NewFD->setImplicitlyInline(); 4414 } 4415 4416 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4417 !CurContext->isRecord()) { 4418 // C++ [class.static]p1: 4419 // A data or function member of a class may be declared static 4420 // in a class definition, in which case it is a static member of 4421 // the class. 4422 4423 // Complain about the 'static' specifier if it's on an out-of-line 4424 // member function definition. 4425 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4426 diag::err_static_out_of_line) 4427 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4428 } 4429 } 4430 4431 // Handle GNU asm-label extension (encoded as an attribute). 4432 if (Expr *E = (Expr*) D.getAsmLabel()) { 4433 // The parser guarantees this is a string. 4434 StringLiteral *SE = cast<StringLiteral>(E); 4435 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 4436 SE->getString())); 4437 } 4438 4439 // Copy the parameter declarations from the declarator D to the function 4440 // declaration NewFD, if they are available. First scavenge them into Params. 4441 llvm::SmallVector<ParmVarDecl*, 16> Params; 4442 if (D.isFunctionDeclarator()) { 4443 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4444 4445 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 4446 // function that takes no arguments, not a function that takes a 4447 // single void argument. 4448 // We let through "const void" here because Sema::GetTypeForDeclarator 4449 // already checks for that case. 4450 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4451 FTI.ArgInfo[0].Param && 4452 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 4453 // Empty arg list, don't push any params. 4454 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 4455 4456 // In C++, the empty parameter-type-list must be spelled "void"; a 4457 // typedef of void is not permitted. 4458 if (getLangOptions().CPlusPlus && 4459 Param->getType().getUnqualifiedType() != Context.VoidTy) { 4460 bool IsTypeAlias = false; 4461 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 4462 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 4463 else if (const TemplateSpecializationType *TST = 4464 Param->getType()->getAs<TemplateSpecializationType>()) 4465 IsTypeAlias = TST->isTypeAlias(); 4466 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 4467 << IsTypeAlias; 4468 } 4469 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 4470 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 4471 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 4472 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 4473 Param->setDeclContext(NewFD); 4474 Params.push_back(Param); 4475 4476 if (Param->isInvalidDecl()) 4477 NewFD->setInvalidDecl(); 4478 } 4479 } 4480 4481 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 4482 // When we're declaring a function with a typedef, typeof, etc as in the 4483 // following example, we'll need to synthesize (unnamed) 4484 // parameters for use in the declaration. 4485 // 4486 // @code 4487 // typedef void fn(int); 4488 // fn f; 4489 // @endcode 4490 4491 // Synthesize a parameter for each argument type. 4492 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 4493 AE = FT->arg_type_end(); AI != AE; ++AI) { 4494 ParmVarDecl *Param = 4495 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 4496 Param->setScopeInfo(0, Params.size()); 4497 Params.push_back(Param); 4498 } 4499 } else { 4500 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 4501 "Should not need args for typedef of non-prototype fn"); 4502 } 4503 // Finally, we know we have the right number of parameters, install them. 4504 NewFD->setParams(Params.data(), Params.size()); 4505 4506 // Process the non-inheritable attributes on this declaration. 4507 ProcessDeclAttributes(S, NewFD, D, 4508 /*NonInheritable=*/true, /*Inheritable=*/false); 4509 4510 if (!getLangOptions().CPlusPlus) { 4511 // Perform semantic checking on the function declaration. 4512 bool isExplctSpecialization=false; 4513 CheckFunctionDeclaration(S, NewFD, Previous, isExplctSpecialization, 4514 Redeclaration); 4515 assert((NewFD->isInvalidDecl() || !Redeclaration || 4516 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4517 "previous declaration set still overloaded"); 4518 } else { 4519 // If the declarator is a template-id, translate the parser's template 4520 // argument list into our AST format. 4521 bool HasExplicitTemplateArgs = false; 4522 TemplateArgumentListInfo TemplateArgs; 4523 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 4524 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 4525 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 4526 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 4527 ASTTemplateArgsPtr TemplateArgsPtr(*this, 4528 TemplateId->getTemplateArgs(), 4529 TemplateId->NumArgs); 4530 translateTemplateArguments(TemplateArgsPtr, 4531 TemplateArgs); 4532 TemplateArgsPtr.release(); 4533 4534 HasExplicitTemplateArgs = true; 4535 4536 if (FunctionTemplate) { 4537 // Function template with explicit template arguments. 4538 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 4539 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 4540 4541 HasExplicitTemplateArgs = false; 4542 } else if (!isFunctionTemplateSpecialization && 4543 !D.getDeclSpec().isFriendSpecified()) { 4544 // We have encountered something that the user meant to be a 4545 // specialization (because it has explicitly-specified template 4546 // arguments) but that was not introduced with a "template<>" (or had 4547 // too few of them). 4548 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 4549 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 4550 << FixItHint::CreateInsertion( 4551 D.getDeclSpec().getSourceRange().getBegin(), 4552 "template<> "); 4553 isFunctionTemplateSpecialization = true; 4554 } else { 4555 // "friend void foo<>(int);" is an implicit specialization decl. 4556 isFunctionTemplateSpecialization = true; 4557 } 4558 } else if (isFriend && isFunctionTemplateSpecialization) { 4559 // This combination is only possible in a recovery case; the user 4560 // wrote something like: 4561 // template <> friend void foo(int); 4562 // which we're recovering from as if the user had written: 4563 // friend void foo<>(int); 4564 // Go ahead and fake up a template id. 4565 HasExplicitTemplateArgs = true; 4566 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 4567 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 4568 } 4569 4570 // If it's a friend (and only if it's a friend), it's possible 4571 // that either the specialized function type or the specialized 4572 // template is dependent, and therefore matching will fail. In 4573 // this case, don't check the specialization yet. 4574 if (isFunctionTemplateSpecialization && isFriend && 4575 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 4576 assert(HasExplicitTemplateArgs && 4577 "friend function specialization without template args"); 4578 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 4579 Previous)) 4580 NewFD->setInvalidDecl(); 4581 } else if (isFunctionTemplateSpecialization) { 4582 if (CurContext->isDependentContext() && CurContext->isRecord() 4583 && !isFriend) { 4584 Diag(NewFD->getLocation(), diag::err_function_specialization_in_class) 4585 << NewFD->getDeclName(); 4586 NewFD->setInvalidDecl(); 4587 return 0; 4588 } else if (CheckFunctionTemplateSpecialization(NewFD, 4589 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 4590 Previous)) 4591 NewFD->setInvalidDecl(); 4592 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 4593 if (CheckMemberSpecialization(NewFD, Previous)) 4594 NewFD->setInvalidDecl(); 4595 } 4596 4597 // Perform semantic checking on the function declaration. 4598 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4599 Redeclaration); 4600 4601 assert((NewFD->isInvalidDecl() || !Redeclaration || 4602 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4603 "previous declaration set still overloaded"); 4604 4605 NamedDecl *PrincipalDecl = (FunctionTemplate 4606 ? cast<NamedDecl>(FunctionTemplate) 4607 : NewFD); 4608 4609 if (isFriend && Redeclaration) { 4610 AccessSpecifier Access = AS_public; 4611 if (!NewFD->isInvalidDecl()) 4612 Access = NewFD->getPreviousDeclaration()->getAccess(); 4613 4614 NewFD->setAccess(Access); 4615 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 4616 4617 PrincipalDecl->setObjectOfFriendDecl(true); 4618 } 4619 4620 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 4621 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 4622 PrincipalDecl->setNonMemberOperator(); 4623 4624 // If we have a function template, check the template parameter 4625 // list. This will check and merge default template arguments. 4626 if (FunctionTemplate) { 4627 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 4628 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 4629 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 4630 D.getDeclSpec().isFriendSpecified() 4631 ? (IsFunctionDefinition 4632 ? TPC_FriendFunctionTemplateDefinition 4633 : TPC_FriendFunctionTemplate) 4634 : (D.getCXXScopeSpec().isSet() && 4635 DC && DC->isRecord() && 4636 DC->isDependentContext()) 4637 ? TPC_ClassTemplateMember 4638 : TPC_FunctionTemplate); 4639 } 4640 4641 if (NewFD->isInvalidDecl()) { 4642 // Ignore all the rest of this. 4643 } else if (!Redeclaration) { 4644 // Fake up an access specifier if it's supposed to be a class member. 4645 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 4646 NewFD->setAccess(AS_public); 4647 4648 // Qualified decls generally require a previous declaration. 4649 if (D.getCXXScopeSpec().isSet()) { 4650 // ...with the major exception of templated-scope or 4651 // dependent-scope friend declarations. 4652 4653 // TODO: we currently also suppress this check in dependent 4654 // contexts because (1) the parameter depth will be off when 4655 // matching friend templates and (2) we might actually be 4656 // selecting a friend based on a dependent factor. But there 4657 // are situations where these conditions don't apply and we 4658 // can actually do this check immediately. 4659 if (isFriend && 4660 (TemplateParamLists.size() || 4661 D.getCXXScopeSpec().getScopeRep()->isDependent() || 4662 CurContext->isDependentContext())) { 4663 // ignore these 4664 } else { 4665 // The user tried to provide an out-of-line definition for a 4666 // function that is a member of a class or namespace, but there 4667 // was no such member function declared (C++ [class.mfct]p2, 4668 // C++ [namespace.memdef]p2). For example: 4669 // 4670 // class X { 4671 // void f() const; 4672 // }; 4673 // 4674 // void X::f() { } // ill-formed 4675 // 4676 // Complain about this problem, and attempt to suggest close 4677 // matches (e.g., those that differ only in cv-qualifiers and 4678 // whether the parameter types are references). 4679 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 4680 << Name << DC << D.getCXXScopeSpec().getRange(); 4681 NewFD->setInvalidDecl(); 4682 4683 DiagnoseInvalidRedeclaration(*this, NewFD); 4684 } 4685 4686 // Unqualified local friend declarations are required to resolve 4687 // to something. 4688 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 4689 Diag(D.getIdentifierLoc(), diag::err_no_matching_local_friend); 4690 NewFD->setInvalidDecl(); 4691 DiagnoseInvalidRedeclaration(*this, NewFD); 4692 } 4693 4694 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 4695 !isFriend && !isFunctionTemplateSpecialization && 4696 !isExplicitSpecialization) { 4697 // An out-of-line member function declaration must also be a 4698 // definition (C++ [dcl.meaning]p1). 4699 // Note that this is not the case for explicit specializations of 4700 // function templates or member functions of class templates, per 4701 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 4702 // for compatibility with old SWIG code which likes to generate them. 4703 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 4704 << D.getCXXScopeSpec().getRange(); 4705 } 4706 } 4707 4708 4709 // Handle attributes. We need to have merged decls when handling attributes 4710 // (for example to check for conflicts, etc). 4711 // FIXME: This needs to happen before we merge declarations. Then, 4712 // let attribute merging cope with attribute conflicts. 4713 ProcessDeclAttributes(S, NewFD, D, 4714 /*NonInheritable=*/false, /*Inheritable=*/true); 4715 4716 // attributes declared post-definition are currently ignored 4717 // FIXME: This should happen during attribute merging 4718 if (Redeclaration && Previous.isSingleResult()) { 4719 const FunctionDecl *Def; 4720 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 4721 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 4722 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 4723 Diag(Def->getLocation(), diag::note_previous_definition); 4724 } 4725 } 4726 4727 AddKnownFunctionAttributes(NewFD); 4728 4729 if (NewFD->hasAttr<OverloadableAttr>() && 4730 !NewFD->getType()->getAs<FunctionProtoType>()) { 4731 Diag(NewFD->getLocation(), 4732 diag::err_attribute_overloadable_no_prototype) 4733 << NewFD; 4734 4735 // Turn this into a variadic function with no parameters. 4736 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 4737 FunctionProtoType::ExtProtoInfo EPI; 4738 EPI.Variadic = true; 4739 EPI.ExtInfo = FT->getExtInfo(); 4740 4741 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 4742 NewFD->setType(R); 4743 } 4744 4745 // If there's a #pragma GCC visibility in scope, and this isn't a class 4746 // member, set the visibility of this function. 4747 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4748 AddPushedVisibilityAttribute(NewFD); 4749 4750 // If this is a locally-scoped extern C function, update the 4751 // map of such names. 4752 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 4753 && !NewFD->isInvalidDecl()) 4754 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 4755 4756 // Set this FunctionDecl's range up to the right paren. 4757 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 4758 4759 if (getLangOptions().CPlusPlus) { 4760 if (FunctionTemplate) { 4761 if (NewFD->isInvalidDecl()) 4762 FunctionTemplate->setInvalidDecl(); 4763 return FunctionTemplate; 4764 } 4765 } 4766 4767 MarkUnusedFileScopedDecl(NewFD); 4768 4769 if (getLangOptions().CUDA) 4770 if (IdentifierInfo *II = NewFD->getIdentifier()) 4771 if (!NewFD->isInvalidDecl() && 4772 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 4773 if (II->isStr("cudaConfigureCall")) { 4774 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 4775 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 4776 4777 Context.setcudaConfigureCallDecl(NewFD); 4778 } 4779 } 4780 4781 return NewFD; 4782} 4783 4784/// \brief Perform semantic checking of a new function declaration. 4785/// 4786/// Performs semantic analysis of the new function declaration 4787/// NewFD. This routine performs all semantic checking that does not 4788/// require the actual declarator involved in the declaration, and is 4789/// used both for the declaration of functions as they are parsed 4790/// (called via ActOnDeclarator) and for the declaration of functions 4791/// that have been instantiated via C++ template instantiation (called 4792/// via InstantiateDecl). 4793/// 4794/// \param IsExplicitSpecialiation whether this new function declaration is 4795/// an explicit specialization of the previous declaration. 4796/// 4797/// This sets NewFD->isInvalidDecl() to true if there was an error. 4798void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 4799 LookupResult &Previous, 4800 bool IsExplicitSpecialization, 4801 bool &Redeclaration) { 4802 // If NewFD is already known erroneous, don't do any of this checking. 4803 if (NewFD->isInvalidDecl()) { 4804 // If this is a class member, mark the class invalid immediately. 4805 // This avoids some consistency errors later. 4806 if (isa<CXXMethodDecl>(NewFD)) 4807 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl(); 4808 4809 return; 4810 } 4811 4812 if (NewFD->getResultType()->isVariablyModifiedType()) { 4813 // Functions returning a variably modified type violate C99 6.7.5.2p2 4814 // because all functions have linkage. 4815 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4816 return NewFD->setInvalidDecl(); 4817 } 4818 4819 if (NewFD->isMain()) 4820 CheckMain(NewFD); 4821 4822 // Check for a previous declaration of this name. 4823 if (Previous.empty() && NewFD->isExternC()) { 4824 // Since we did not find anything by this name and we're declaring 4825 // an extern "C" function, look for a non-visible extern "C" 4826 // declaration with the same name. 4827 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4828 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 4829 if (Pos != LocallyScopedExternalDecls.end()) 4830 Previous.addDecl(Pos->second); 4831 } 4832 4833 // Merge or overload the declaration with an existing declaration of 4834 // the same name, if appropriate. 4835 if (!Previous.empty()) { 4836 // Determine whether NewFD is an overload of PrevDecl or 4837 // a declaration that requires merging. If it's an overload, 4838 // there's no more work to do here; we'll just add the new 4839 // function to the scope. 4840 4841 NamedDecl *OldDecl = 0; 4842 if (!AllowOverloadingOfFunction(Previous, Context)) { 4843 Redeclaration = true; 4844 OldDecl = Previous.getFoundDecl(); 4845 } else { 4846 switch (CheckOverload(S, NewFD, Previous, OldDecl, 4847 /*NewIsUsingDecl*/ false)) { 4848 case Ovl_Match: 4849 Redeclaration = true; 4850 break; 4851 4852 case Ovl_NonFunction: 4853 Redeclaration = true; 4854 break; 4855 4856 case Ovl_Overload: 4857 Redeclaration = false; 4858 break; 4859 } 4860 4861 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 4862 // If a function name is overloadable in C, then every function 4863 // with that name must be marked "overloadable". 4864 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 4865 << Redeclaration << NewFD; 4866 NamedDecl *OverloadedDecl = 0; 4867 if (Redeclaration) 4868 OverloadedDecl = OldDecl; 4869 else if (!Previous.empty()) 4870 OverloadedDecl = Previous.getRepresentativeDecl(); 4871 if (OverloadedDecl) 4872 Diag(OverloadedDecl->getLocation(), 4873 diag::note_attribute_overloadable_prev_overload); 4874 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 4875 Context)); 4876 } 4877 } 4878 4879 if (Redeclaration) { 4880 // NewFD and OldDecl represent declarations that need to be 4881 // merged. 4882 if (MergeFunctionDecl(NewFD, OldDecl)) 4883 return NewFD->setInvalidDecl(); 4884 4885 Previous.clear(); 4886 Previous.addDecl(OldDecl); 4887 4888 if (FunctionTemplateDecl *OldTemplateDecl 4889 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 4890 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 4891 FunctionTemplateDecl *NewTemplateDecl 4892 = NewFD->getDescribedFunctionTemplate(); 4893 assert(NewTemplateDecl && "Template/non-template mismatch"); 4894 if (CXXMethodDecl *Method 4895 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 4896 Method->setAccess(OldTemplateDecl->getAccess()); 4897 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 4898 } 4899 4900 // If this is an explicit specialization of a member that is a function 4901 // template, mark it as a member specialization. 4902 if (IsExplicitSpecialization && 4903 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 4904 NewTemplateDecl->setMemberSpecialization(); 4905 assert(OldTemplateDecl->isMemberSpecialization()); 4906 } 4907 } else { 4908 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 4909 NewFD->setAccess(OldDecl->getAccess()); 4910 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 4911 } 4912 } 4913 } 4914 4915 // Semantic checking for this function declaration (in isolation). 4916 if (getLangOptions().CPlusPlus) { 4917 // C++-specific checks. 4918 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 4919 CheckConstructor(Constructor); 4920 } else if (CXXDestructorDecl *Destructor = 4921 dyn_cast<CXXDestructorDecl>(NewFD)) { 4922 CXXRecordDecl *Record = Destructor->getParent(); 4923 QualType ClassType = Context.getTypeDeclType(Record); 4924 4925 // FIXME: Shouldn't we be able to perform this check even when the class 4926 // type is dependent? Both gcc and edg can handle that. 4927 if (!ClassType->isDependentType()) { 4928 DeclarationName Name 4929 = Context.DeclarationNames.getCXXDestructorName( 4930 Context.getCanonicalType(ClassType)); 4931 if (NewFD->getDeclName() != Name) { 4932 Diag(NewFD->getLocation(), diag::err_destructor_name); 4933 return NewFD->setInvalidDecl(); 4934 } 4935 } 4936 } else if (CXXConversionDecl *Conversion 4937 = dyn_cast<CXXConversionDecl>(NewFD)) { 4938 ActOnConversionDeclarator(Conversion); 4939 } 4940 4941 // Find any virtual functions that this function overrides. 4942 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 4943 if (!Method->isFunctionTemplateSpecialization() && 4944 !Method->getDescribedFunctionTemplate()) { 4945 if (AddOverriddenMethods(Method->getParent(), Method)) { 4946 // If the function was marked as "static", we have a problem. 4947 if (NewFD->getStorageClass() == SC_Static) { 4948 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 4949 << NewFD->getDeclName(); 4950 for (CXXMethodDecl::method_iterator 4951 Overridden = Method->begin_overridden_methods(), 4952 OverriddenEnd = Method->end_overridden_methods(); 4953 Overridden != OverriddenEnd; 4954 ++Overridden) { 4955 Diag((*Overridden)->getLocation(), 4956 diag::note_overridden_virtual_function); 4957 } 4958 } 4959 } 4960 } 4961 } 4962 4963 // Extra checking for C++ overloaded operators (C++ [over.oper]). 4964 if (NewFD->isOverloadedOperator() && 4965 CheckOverloadedOperatorDeclaration(NewFD)) 4966 return NewFD->setInvalidDecl(); 4967 4968 // Extra checking for C++0x literal operators (C++0x [over.literal]). 4969 if (NewFD->getLiteralIdentifier() && 4970 CheckLiteralOperatorDeclaration(NewFD)) 4971 return NewFD->setInvalidDecl(); 4972 4973 // In C++, check default arguments now that we have merged decls. Unless 4974 // the lexical context is the class, because in this case this is done 4975 // during delayed parsing anyway. 4976 if (!CurContext->isRecord()) 4977 CheckCXXDefaultArguments(NewFD); 4978 4979 // If this function declares a builtin function, check the type of this 4980 // declaration against the expected type for the builtin. 4981 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 4982 ASTContext::GetBuiltinTypeError Error; 4983 QualType T = Context.GetBuiltinType(BuiltinID, Error); 4984 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 4985 // The type of this function differs from the type of the builtin, 4986 // so forget about the builtin entirely. 4987 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 4988 } 4989 } 4990 } 4991} 4992 4993void Sema::CheckMain(FunctionDecl* FD) { 4994 // C++ [basic.start.main]p3: A program that declares main to be inline 4995 // or static is ill-formed. 4996 // C99 6.7.4p4: In a hosted environment, the inline function specifier 4997 // shall not appear in a declaration of main. 4998 // static main is not an error under C99, but we should warn about it. 4999 bool isInline = FD->isInlineSpecified(); 5000 bool isStatic = FD->getStorageClass() == SC_Static; 5001 if (isInline || isStatic) { 5002 unsigned diagID = diag::warn_unusual_main_decl; 5003 if (isInline || getLangOptions().CPlusPlus) 5004 diagID = diag::err_unusual_main_decl; 5005 5006 int which = isStatic + (isInline << 1) - 1; 5007 Diag(FD->getLocation(), diagID) << which; 5008 } 5009 5010 QualType T = FD->getType(); 5011 assert(T->isFunctionType() && "function decl is not of function type"); 5012 const FunctionType* FT = T->getAs<FunctionType>(); 5013 5014 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5015 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5016 FD->setInvalidDecl(true); 5017 } 5018 5019 // Treat protoless main() as nullary. 5020 if (isa<FunctionNoProtoType>(FT)) return; 5021 5022 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5023 unsigned nparams = FTP->getNumArgs(); 5024 assert(FD->getNumParams() == nparams); 5025 5026 bool HasExtraParameters = (nparams > 3); 5027 5028 // Darwin passes an undocumented fourth argument of type char**. If 5029 // other platforms start sprouting these, the logic below will start 5030 // getting shifty. 5031 if (nparams == 4 && Context.Target.getTriple().isOSDarwin()) 5032 HasExtraParameters = false; 5033 5034 if (HasExtraParameters) { 5035 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5036 FD->setInvalidDecl(true); 5037 nparams = 3; 5038 } 5039 5040 // FIXME: a lot of the following diagnostics would be improved 5041 // if we had some location information about types. 5042 5043 QualType CharPP = 5044 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5045 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5046 5047 for (unsigned i = 0; i < nparams; ++i) { 5048 QualType AT = FTP->getArgType(i); 5049 5050 bool mismatch = true; 5051 5052 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5053 mismatch = false; 5054 else if (Expected[i] == CharPP) { 5055 // As an extension, the following forms are okay: 5056 // char const ** 5057 // char const * const * 5058 // char * const * 5059 5060 QualifierCollector qs; 5061 const PointerType* PT; 5062 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5063 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5064 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5065 qs.removeConst(); 5066 mismatch = !qs.empty(); 5067 } 5068 } 5069 5070 if (mismatch) { 5071 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5072 // TODO: suggest replacing given type with expected type 5073 FD->setInvalidDecl(true); 5074 } 5075 } 5076 5077 if (nparams == 1 && !FD->isInvalidDecl()) { 5078 Diag(FD->getLocation(), diag::warn_main_one_arg); 5079 } 5080 5081 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5082 Diag(FD->getLocation(), diag::err_main_template_decl); 5083 FD->setInvalidDecl(); 5084 } 5085} 5086 5087bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5088 // FIXME: Need strict checking. In C89, we need to check for 5089 // any assignment, increment, decrement, function-calls, or 5090 // commas outside of a sizeof. In C99, it's the same list, 5091 // except that the aforementioned are allowed in unevaluated 5092 // expressions. Everything else falls under the 5093 // "may accept other forms of constant expressions" exception. 5094 // (We never end up here for C++, so the constant expression 5095 // rules there don't matter.) 5096 if (Init->isConstantInitializer(Context, false)) 5097 return false; 5098 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5099 << Init->getSourceRange(); 5100 return true; 5101} 5102 5103namespace { 5104 // Visits an initialization expression to see if OrigDecl is evaluated in 5105 // its own initialization and throws a warning if it does. 5106 class SelfReferenceChecker 5107 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5108 Sema &S; 5109 Decl *OrigDecl; 5110 5111 public: 5112 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5113 5114 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5115 S(S), OrigDecl(OrigDecl) { } 5116 5117 void VisitExpr(Expr *E) { 5118 if (isa<ObjCMessageExpr>(*E)) return; 5119 Inherited::VisitExpr(E); 5120 } 5121 5122 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5123 CheckForSelfReference(E); 5124 Inherited::VisitImplicitCastExpr(E); 5125 } 5126 5127 void CheckForSelfReference(ImplicitCastExpr *E) { 5128 if (E->getCastKind() != CK_LValueToRValue) return; 5129 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5130 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr); 5131 if (!DRE) return; 5132 Decl* ReferenceDecl = DRE->getDecl(); 5133 if (OrigDecl != ReferenceDecl) return; 5134 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5135 Sema::NotForRedeclaration); 5136 S.Diag(SubExpr->getLocStart(), diag::warn_uninit_self_reference_in_init) 5137 << Result.getLookupName() << OrigDecl->getLocation() 5138 << SubExpr->getSourceRange(); 5139 } 5140 }; 5141} 5142 5143/// AddInitializerToDecl - Adds the initializer Init to the 5144/// declaration dcl. If DirectInit is true, this is C++ direct 5145/// initialization rather than copy initialization. 5146void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5147 bool DirectInit, bool TypeMayContainAuto) { 5148 // If there is no declaration, there was an error parsing it. Just ignore 5149 // the initializer. 5150 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5151 return; 5152 5153 // Check for self-references within variable initializers. 5154 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5155 // Variables declared within a function/method body are handled 5156 // by a dataflow analysis. 5157 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5158 SelfReferenceChecker(*this, RealDecl).VisitExpr(Init); 5159 } 5160 else { 5161 SelfReferenceChecker(*this, RealDecl).VisitExpr(Init); 5162 } 5163 5164 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5165 // With declarators parsed the way they are, the parser cannot 5166 // distinguish between a normal initializer and a pure-specifier. 5167 // Thus this grotesque test. 5168 IntegerLiteral *IL; 5169 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5170 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5171 CheckPureMethod(Method, Init->getSourceRange()); 5172 else { 5173 Diag(Method->getLocation(), diag::err_member_function_initialization) 5174 << Method->getDeclName() << Init->getSourceRange(); 5175 Method->setInvalidDecl(); 5176 } 5177 return; 5178 } 5179 5180 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5181 if (!VDecl) { 5182 if (getLangOptions().CPlusPlus && 5183 RealDecl->getLexicalDeclContext()->isRecord() && 5184 isa<NamedDecl>(RealDecl)) 5185 Diag(RealDecl->getLocation(), diag::err_member_initialization); 5186 else 5187 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5188 RealDecl->setInvalidDecl(); 5189 return; 5190 } 5191 5192 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5193 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5194 TypeSourceInfo *DeducedType = 0; 5195 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5196 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5197 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5198 << Init->getSourceRange(); 5199 if (!DeducedType) { 5200 RealDecl->setInvalidDecl(); 5201 return; 5202 } 5203 VDecl->setTypeSourceInfo(DeducedType); 5204 VDecl->setType(DeducedType->getType()); 5205 5206 // If this is a redeclaration, check that the type we just deduced matches 5207 // the previously declared type. 5208 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5209 MergeVarDeclTypes(VDecl, Old); 5210 } 5211 5212 5213 // A definition must end up with a complete type, which means it must be 5214 // complete with the restriction that an array type might be completed by the 5215 // initializer; note that later code assumes this restriction. 5216 QualType BaseDeclType = VDecl->getType(); 5217 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5218 BaseDeclType = Array->getElementType(); 5219 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5220 diag::err_typecheck_decl_incomplete_type)) { 5221 RealDecl->setInvalidDecl(); 5222 return; 5223 } 5224 5225 // The variable can not have an abstract class type. 5226 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5227 diag::err_abstract_type_in_decl, 5228 AbstractVariableType)) 5229 VDecl->setInvalidDecl(); 5230 5231 const VarDecl *Def; 5232 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5233 Diag(VDecl->getLocation(), diag::err_redefinition) 5234 << VDecl->getDeclName(); 5235 Diag(Def->getLocation(), diag::note_previous_definition); 5236 VDecl->setInvalidDecl(); 5237 return; 5238 } 5239 5240 const VarDecl* PrevInit = 0; 5241 if (getLangOptions().CPlusPlus) { 5242 // C++ [class.static.data]p4 5243 // If a static data member is of const integral or const 5244 // enumeration type, its declaration in the class definition can 5245 // specify a constant-initializer which shall be an integral 5246 // constant expression (5.19). In that case, the member can appear 5247 // in integral constant expressions. The member shall still be 5248 // defined in a namespace scope if it is used in the program and the 5249 // namespace scope definition shall not contain an initializer. 5250 // 5251 // We already performed a redefinition check above, but for static 5252 // data members we also need to check whether there was an in-class 5253 // declaration with an initializer. 5254 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5255 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5256 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5257 return; 5258 } 5259 5260 if (VDecl->hasLocalStorage()) 5261 getCurFunction()->setHasBranchProtectedScope(); 5262 5263 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5264 VDecl->setInvalidDecl(); 5265 return; 5266 } 5267 } 5268 5269 // Capture the variable that is being initialized and the style of 5270 // initialization. 5271 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5272 5273 // FIXME: Poor source location information. 5274 InitializationKind Kind 5275 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5276 Init->getLocStart(), 5277 Init->getLocEnd()) 5278 : InitializationKind::CreateCopy(VDecl->getLocation(), 5279 Init->getLocStart()); 5280 5281 // Get the decls type and save a reference for later, since 5282 // CheckInitializerTypes may change it. 5283 QualType DclT = VDecl->getType(), SavT = DclT; 5284 if (VDecl->isLocalVarDecl()) { 5285 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5286 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5287 VDecl->setInvalidDecl(); 5288 } else if (!VDecl->isInvalidDecl()) { 5289 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5290 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5291 MultiExprArg(*this, &Init, 1), 5292 &DclT); 5293 if (Result.isInvalid()) { 5294 VDecl->setInvalidDecl(); 5295 return; 5296 } 5297 5298 Init = Result.takeAs<Expr>(); 5299 5300 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5301 // Don't check invalid declarations to avoid emitting useless diagnostics. 5302 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5303 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 5304 CheckForConstantInitializer(Init, DclT); 5305 } 5306 } 5307 } else if (VDecl->isStaticDataMember() && 5308 VDecl->getLexicalDeclContext()->isRecord()) { 5309 // This is an in-class initialization for a static data member, e.g., 5310 // 5311 // struct S { 5312 // static const int value = 17; 5313 // }; 5314 5315 // Try to perform the initialization regardless. 5316 if (!VDecl->isInvalidDecl()) { 5317 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5318 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5319 MultiExprArg(*this, &Init, 1), 5320 &DclT); 5321 if (Result.isInvalid()) { 5322 VDecl->setInvalidDecl(); 5323 return; 5324 } 5325 5326 Init = Result.takeAs<Expr>(); 5327 } 5328 5329 // C++ [class.mem]p4: 5330 // A member-declarator can contain a constant-initializer only 5331 // if it declares a static member (9.4) of const integral or 5332 // const enumeration type, see 9.4.2. 5333 QualType T = VDecl->getType(); 5334 5335 // Do nothing on dependent types. 5336 if (T->isDependentType()) { 5337 5338 // Require constness. 5339 } else if (!T.isConstQualified()) { 5340 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 5341 << Init->getSourceRange(); 5342 VDecl->setInvalidDecl(); 5343 5344 // We allow integer constant expressions in all cases. 5345 } else if (T->isIntegralOrEnumerationType()) { 5346 if (!Init->isValueDependent()) { 5347 // Check whether the expression is a constant expression. 5348 llvm::APSInt Value; 5349 SourceLocation Loc; 5350 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 5351 Diag(Loc, diag::err_in_class_initializer_non_constant) 5352 << Init->getSourceRange(); 5353 VDecl->setInvalidDecl(); 5354 } 5355 } 5356 5357 // We allow floating-point constants as an extension in C++03, and 5358 // C++0x has far more complicated rules that we don't really 5359 // implement fully. 5360 } else { 5361 bool Allowed = false; 5362 if (getLangOptions().CPlusPlus0x) { 5363 Allowed = T->isLiteralType(); 5364 } else if (T->isFloatingType()) { // also permits complex, which is ok 5365 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 5366 << T << Init->getSourceRange(); 5367 Allowed = true; 5368 } 5369 5370 if (!Allowed) { 5371 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 5372 << T << Init->getSourceRange(); 5373 VDecl->setInvalidDecl(); 5374 5375 // TODO: there are probably expressions that pass here that shouldn't. 5376 } else if (!Init->isValueDependent() && 5377 !Init->isConstantInitializer(Context, false)) { 5378 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 5379 << Init->getSourceRange(); 5380 VDecl->setInvalidDecl(); 5381 } 5382 } 5383 } else if (VDecl->isFileVarDecl()) { 5384 if (VDecl->getStorageClassAsWritten() == SC_Extern && 5385 (!getLangOptions().CPlusPlus || 5386 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 5387 Diag(VDecl->getLocation(), diag::warn_extern_init); 5388 if (!VDecl->isInvalidDecl()) { 5389 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5390 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5391 MultiExprArg(*this, &Init, 1), 5392 &DclT); 5393 if (Result.isInvalid()) { 5394 VDecl->setInvalidDecl(); 5395 return; 5396 } 5397 5398 Init = Result.takeAs<Expr>(); 5399 } 5400 5401 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5402 // Don't check invalid declarations to avoid emitting useless diagnostics. 5403 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5404 // C99 6.7.8p4. All file scoped initializers need to be constant. 5405 CheckForConstantInitializer(Init, DclT); 5406 } 5407 } 5408 // If the type changed, it means we had an incomplete type that was 5409 // completed by the initializer. For example: 5410 // int ary[] = { 1, 3, 5 }; 5411 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 5412 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 5413 VDecl->setType(DclT); 5414 Init->setType(DclT); 5415 } 5416 5417 5418 // If this variable is a local declaration with record type, make sure it 5419 // doesn't have a flexible member initialization. We only support this as a 5420 // global/static definition. 5421 if (VDecl->hasLocalStorage()) 5422 if (const RecordType *RT = VDecl->getType()->getAs<RecordType>()) 5423 if (RT->getDecl()->hasFlexibleArrayMember()) { 5424 // Check whether the initializer tries to initialize the flexible 5425 // array member itself to anything other than an empty initializer list. 5426 if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) { 5427 unsigned Index = std::distance(RT->getDecl()->field_begin(), 5428 RT->getDecl()->field_end()) - 1; 5429 if (Index < ILE->getNumInits() && 5430 !(isa<InitListExpr>(ILE->getInit(Index)) && 5431 cast<InitListExpr>(ILE->getInit(Index))->getNumInits() == 0)) { 5432 Diag(VDecl->getLocation(), diag::err_nonstatic_flexible_variable); 5433 VDecl->setInvalidDecl(); 5434 } 5435 } 5436 } 5437 5438 // Check any implicit conversions within the expression. 5439 CheckImplicitConversions(Init, VDecl->getLocation()); 5440 5441 Init = MaybeCreateExprWithCleanups(Init); 5442 // Attach the initializer to the decl. 5443 VDecl->setInit(Init); 5444 5445 CheckCompleteVariableDeclaration(VDecl); 5446} 5447 5448/// ActOnInitializerError - Given that there was an error parsing an 5449/// initializer for the given declaration, try to return to some form 5450/// of sanity. 5451void Sema::ActOnInitializerError(Decl *D) { 5452 // Our main concern here is re-establishing invariants like "a 5453 // variable's type is either dependent or complete". 5454 if (!D || D->isInvalidDecl()) return; 5455 5456 VarDecl *VD = dyn_cast<VarDecl>(D); 5457 if (!VD) return; 5458 5459 // Auto types are meaningless if we can't make sense of the initializer. 5460 if (ParsingInitForAutoVars.count(D)) { 5461 D->setInvalidDecl(); 5462 return; 5463 } 5464 5465 QualType Ty = VD->getType(); 5466 if (Ty->isDependentType()) return; 5467 5468 // Require a complete type. 5469 if (RequireCompleteType(VD->getLocation(), 5470 Context.getBaseElementType(Ty), 5471 diag::err_typecheck_decl_incomplete_type)) { 5472 VD->setInvalidDecl(); 5473 return; 5474 } 5475 5476 // Require an abstract type. 5477 if (RequireNonAbstractType(VD->getLocation(), Ty, 5478 diag::err_abstract_type_in_decl, 5479 AbstractVariableType)) { 5480 VD->setInvalidDecl(); 5481 return; 5482 } 5483 5484 // Don't bother complaining about constructors or destructors, 5485 // though. 5486} 5487 5488void Sema::ActOnUninitializedDecl(Decl *RealDecl, 5489 bool TypeMayContainAuto) { 5490 // If there is no declaration, there was an error parsing it. Just ignore it. 5491 if (RealDecl == 0) 5492 return; 5493 5494 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 5495 QualType Type = Var->getType(); 5496 5497 // C++0x [dcl.spec.auto]p3 5498 if (TypeMayContainAuto && Type->getContainedAutoType()) { 5499 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 5500 << Var->getDeclName() << Type; 5501 Var->setInvalidDecl(); 5502 return; 5503 } 5504 5505 switch (Var->isThisDeclarationADefinition()) { 5506 case VarDecl::Definition: 5507 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 5508 break; 5509 5510 // We have an out-of-line definition of a static data member 5511 // that has an in-class initializer, so we type-check this like 5512 // a declaration. 5513 // 5514 // Fall through 5515 5516 case VarDecl::DeclarationOnly: 5517 // It's only a declaration. 5518 5519 // Block scope. C99 6.7p7: If an identifier for an object is 5520 // declared with no linkage (C99 6.2.2p6), the type for the 5521 // object shall be complete. 5522 if (!Type->isDependentType() && Var->isLocalVarDecl() && 5523 !Var->getLinkage() && !Var->isInvalidDecl() && 5524 RequireCompleteType(Var->getLocation(), Type, 5525 diag::err_typecheck_decl_incomplete_type)) 5526 Var->setInvalidDecl(); 5527 5528 // Make sure that the type is not abstract. 5529 if (!Type->isDependentType() && !Var->isInvalidDecl() && 5530 RequireNonAbstractType(Var->getLocation(), Type, 5531 diag::err_abstract_type_in_decl, 5532 AbstractVariableType)) 5533 Var->setInvalidDecl(); 5534 return; 5535 5536 case VarDecl::TentativeDefinition: 5537 // File scope. C99 6.9.2p2: A declaration of an identifier for an 5538 // object that has file scope without an initializer, and without a 5539 // storage-class specifier or with the storage-class specifier "static", 5540 // constitutes a tentative definition. Note: A tentative definition with 5541 // external linkage is valid (C99 6.2.2p5). 5542 if (!Var->isInvalidDecl()) { 5543 if (const IncompleteArrayType *ArrayT 5544 = Context.getAsIncompleteArrayType(Type)) { 5545 if (RequireCompleteType(Var->getLocation(), 5546 ArrayT->getElementType(), 5547 diag::err_illegal_decl_array_incomplete_type)) 5548 Var->setInvalidDecl(); 5549 } else if (Var->getStorageClass() == SC_Static) { 5550 // C99 6.9.2p3: If the declaration of an identifier for an object is 5551 // a tentative definition and has internal linkage (C99 6.2.2p3), the 5552 // declared type shall not be an incomplete type. 5553 // NOTE: code such as the following 5554 // static struct s; 5555 // struct s { int a; }; 5556 // is accepted by gcc. Hence here we issue a warning instead of 5557 // an error and we do not invalidate the static declaration. 5558 // NOTE: to avoid multiple warnings, only check the first declaration. 5559 if (Var->getPreviousDeclaration() == 0) 5560 RequireCompleteType(Var->getLocation(), Type, 5561 diag::ext_typecheck_decl_incomplete_type); 5562 } 5563 } 5564 5565 // Record the tentative definition; we're done. 5566 if (!Var->isInvalidDecl()) 5567 TentativeDefinitions.push_back(Var); 5568 return; 5569 } 5570 5571 // Provide a specific diagnostic for uninitialized variable 5572 // definitions with incomplete array type. 5573 if (Type->isIncompleteArrayType()) { 5574 Diag(Var->getLocation(), 5575 diag::err_typecheck_incomplete_array_needs_initializer); 5576 Var->setInvalidDecl(); 5577 return; 5578 } 5579 5580 // Provide a specific diagnostic for uninitialized variable 5581 // definitions with reference type. 5582 if (Type->isReferenceType()) { 5583 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 5584 << Var->getDeclName() 5585 << SourceRange(Var->getLocation(), Var->getLocation()); 5586 Var->setInvalidDecl(); 5587 return; 5588 } 5589 5590 // Do not attempt to type-check the default initializer for a 5591 // variable with dependent type. 5592 if (Type->isDependentType()) 5593 return; 5594 5595 if (Var->isInvalidDecl()) 5596 return; 5597 5598 if (RequireCompleteType(Var->getLocation(), 5599 Context.getBaseElementType(Type), 5600 diag::err_typecheck_decl_incomplete_type)) { 5601 Var->setInvalidDecl(); 5602 return; 5603 } 5604 5605 // The variable can not have an abstract class type. 5606 if (RequireNonAbstractType(Var->getLocation(), Type, 5607 diag::err_abstract_type_in_decl, 5608 AbstractVariableType)) { 5609 Var->setInvalidDecl(); 5610 return; 5611 } 5612 5613 const RecordType *Record 5614 = Context.getBaseElementType(Type)->getAs<RecordType>(); 5615 if (Record && getLangOptions().CPlusPlus && 5616 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 5617 // C++03 [dcl.init]p9: 5618 // If no initializer is specified for an object, and the 5619 // object is of (possibly cv-qualified) non-POD class type (or 5620 // array thereof), the object shall be default-initialized; if 5621 // the object is of const-qualified type, the underlying class 5622 // type shall have a user-declared default 5623 // constructor. Otherwise, if no initializer is specified for 5624 // a non- static object, the object and its subobjects, if 5625 // any, have an indeterminate initial value); if the object 5626 // or any of its subobjects are of const-qualified type, the 5627 // program is ill-formed. 5628 } else { 5629 // Check for jumps past the implicit initializer. C++0x 5630 // clarifies that this applies to a "variable with automatic 5631 // storage duration", not a "local variable". 5632 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) 5633 getCurFunction()->setHasBranchProtectedScope(); 5634 5635 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 5636 InitializationKind Kind 5637 = InitializationKind::CreateDefault(Var->getLocation()); 5638 5639 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 5640 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 5641 MultiExprArg(*this, 0, 0)); 5642 if (Init.isInvalid()) 5643 Var->setInvalidDecl(); 5644 else if (Init.get()) 5645 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 5646 } 5647 5648 CheckCompleteVariableDeclaration(Var); 5649 } 5650} 5651 5652void Sema::ActOnCXXForRangeDecl(Decl *D) { 5653 VarDecl *VD = dyn_cast<VarDecl>(D); 5654 if (!VD) { 5655 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 5656 D->setInvalidDecl(); 5657 return; 5658 } 5659 5660 VD->setCXXForRangeDecl(true); 5661 5662 // for-range-declaration cannot be given a storage class specifier. 5663 int Error = -1; 5664 switch (VD->getStorageClassAsWritten()) { 5665 case SC_None: 5666 break; 5667 case SC_Extern: 5668 Error = 0; 5669 break; 5670 case SC_Static: 5671 Error = 1; 5672 break; 5673 case SC_PrivateExtern: 5674 Error = 2; 5675 break; 5676 case SC_Auto: 5677 Error = 3; 5678 break; 5679 case SC_Register: 5680 Error = 4; 5681 break; 5682 } 5683 // FIXME: constexpr isn't allowed here. 5684 //if (DS.isConstexprSpecified()) 5685 // Error = 5; 5686 if (Error != -1) { 5687 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 5688 << VD->getDeclName() << Error; 5689 D->setInvalidDecl(); 5690 } 5691} 5692 5693void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 5694 if (var->isInvalidDecl()) return; 5695 5696 // All the following checks are C++ only. 5697 if (!getLangOptions().CPlusPlus) return; 5698 5699 QualType baseType = Context.getBaseElementType(var->getType()); 5700 if (baseType->isDependentType()) return; 5701 5702 // __block variables might require us to capture a copy-initializer. 5703 if (var->hasAttr<BlocksAttr>()) { 5704 // It's currently invalid to ever have a __block variable with an 5705 // array type; should we diagnose that here? 5706 5707 // Regardless, we don't want to ignore array nesting when 5708 // constructing this copy. 5709 QualType type = var->getType(); 5710 5711 if (type->isStructureOrClassType()) { 5712 SourceLocation poi = var->getLocation(); 5713 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 5714 ExprResult result = 5715 PerformCopyInitialization( 5716 InitializedEntity::InitializeBlock(poi, type, false), 5717 poi, Owned(varRef)); 5718 if (!result.isInvalid()) { 5719 result = MaybeCreateExprWithCleanups(result); 5720 Expr *init = result.takeAs<Expr>(); 5721 Context.setBlockVarCopyInits(var, init); 5722 } 5723 } 5724 } 5725 5726 // Check for global constructors. 5727 if (!var->getDeclContext()->isDependentContext() && 5728 var->hasGlobalStorage() && 5729 !var->isStaticLocal() && 5730 var->getInit() && 5731 !var->getInit()->isConstantInitializer(Context, 5732 baseType->isReferenceType())) 5733 Diag(var->getLocation(), diag::warn_global_constructor) 5734 << var->getInit()->getSourceRange(); 5735 5736 // Require the destructor. 5737 if (const RecordType *recordType = baseType->getAs<RecordType>()) 5738 FinalizeVarWithDestructor(var, recordType); 5739} 5740 5741/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 5742/// any semantic actions necessary after any initializer has been attached. 5743void 5744Sema::FinalizeDeclaration(Decl *ThisDecl) { 5745 // Note that we are no longer parsing the initializer for this declaration. 5746 ParsingInitForAutoVars.erase(ThisDecl); 5747} 5748 5749Sema::DeclGroupPtrTy 5750Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 5751 Decl **Group, unsigned NumDecls) { 5752 llvm::SmallVector<Decl*, 8> Decls; 5753 5754 if (DS.isTypeSpecOwned()) 5755 Decls.push_back(DS.getRepAsDecl()); 5756 5757 for (unsigned i = 0; i != NumDecls; ++i) 5758 if (Decl *D = Group[i]) 5759 Decls.push_back(D); 5760 5761 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 5762 DS.getTypeSpecType() == DeclSpec::TST_auto); 5763} 5764 5765/// BuildDeclaratorGroup - convert a list of declarations into a declaration 5766/// group, performing any necessary semantic checking. 5767Sema::DeclGroupPtrTy 5768Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 5769 bool TypeMayContainAuto) { 5770 // C++0x [dcl.spec.auto]p7: 5771 // If the type deduced for the template parameter U is not the same in each 5772 // deduction, the program is ill-formed. 5773 // FIXME: When initializer-list support is added, a distinction is needed 5774 // between the deduced type U and the deduced type which 'auto' stands for. 5775 // auto a = 0, b = { 1, 2, 3 }; 5776 // is legal because the deduced type U is 'int' in both cases. 5777 if (TypeMayContainAuto && NumDecls > 1) { 5778 QualType Deduced; 5779 CanQualType DeducedCanon; 5780 VarDecl *DeducedDecl = 0; 5781 for (unsigned i = 0; i != NumDecls; ++i) { 5782 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 5783 AutoType *AT = D->getType()->getContainedAutoType(); 5784 // Don't reissue diagnostics when instantiating a template. 5785 if (AT && D->isInvalidDecl()) 5786 break; 5787 if (AT && AT->isDeduced()) { 5788 QualType U = AT->getDeducedType(); 5789 CanQualType UCanon = Context.getCanonicalType(U); 5790 if (Deduced.isNull()) { 5791 Deduced = U; 5792 DeducedCanon = UCanon; 5793 DeducedDecl = D; 5794 } else if (DeducedCanon != UCanon) { 5795 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 5796 diag::err_auto_different_deductions) 5797 << Deduced << DeducedDecl->getDeclName() 5798 << U << D->getDeclName() 5799 << DeducedDecl->getInit()->getSourceRange() 5800 << D->getInit()->getSourceRange(); 5801 D->setInvalidDecl(); 5802 break; 5803 } 5804 } 5805 } 5806 } 5807 } 5808 5809 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 5810} 5811 5812 5813/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 5814/// to introduce parameters into function prototype scope. 5815Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 5816 const DeclSpec &DS = D.getDeclSpec(); 5817 5818 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 5819 VarDecl::StorageClass StorageClass = SC_None; 5820 VarDecl::StorageClass StorageClassAsWritten = SC_None; 5821 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 5822 StorageClass = SC_Register; 5823 StorageClassAsWritten = SC_Register; 5824 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 5825 Diag(DS.getStorageClassSpecLoc(), 5826 diag::err_invalid_storage_class_in_func_decl); 5827 D.getMutableDeclSpec().ClearStorageClassSpecs(); 5828 } 5829 5830 if (D.getDeclSpec().isThreadSpecified()) 5831 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5832 5833 DiagnoseFunctionSpecifiers(D); 5834 5835 TagDecl *OwnedDecl = 0; 5836 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 5837 QualType parmDeclType = TInfo->getType(); 5838 5839 if (getLangOptions().CPlusPlus) { 5840 // Check that there are no default arguments inside the type of this 5841 // parameter. 5842 CheckExtraCXXDefaultArguments(D); 5843 5844 if (OwnedDecl && OwnedDecl->isDefinition()) { 5845 // C++ [dcl.fct]p6: 5846 // Types shall not be defined in return or parameter types. 5847 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 5848 << Context.getTypeDeclType(OwnedDecl); 5849 } 5850 5851 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 5852 if (D.getCXXScopeSpec().isSet()) { 5853 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 5854 << D.getCXXScopeSpec().getRange(); 5855 D.getCXXScopeSpec().clear(); 5856 } 5857 } 5858 5859 // Ensure we have a valid name 5860 IdentifierInfo *II = 0; 5861 if (D.hasName()) { 5862 II = D.getIdentifier(); 5863 if (!II) { 5864 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 5865 << GetNameForDeclarator(D).getName().getAsString(); 5866 D.setInvalidType(true); 5867 } 5868 } 5869 5870 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 5871 if (II) { 5872 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 5873 ForRedeclaration); 5874 LookupName(R, S); 5875 if (R.isSingleResult()) { 5876 NamedDecl *PrevDecl = R.getFoundDecl(); 5877 if (PrevDecl->isTemplateParameter()) { 5878 // Maybe we will complain about the shadowed template parameter. 5879 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5880 // Just pretend that we didn't see the previous declaration. 5881 PrevDecl = 0; 5882 } else if (S->isDeclScope(PrevDecl)) { 5883 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 5884 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5885 5886 // Recover by removing the name 5887 II = 0; 5888 D.SetIdentifier(0, D.getIdentifierLoc()); 5889 D.setInvalidType(true); 5890 } 5891 } 5892 } 5893 5894 // Temporarily put parameter variables in the translation unit, not 5895 // the enclosing context. This prevents them from accidentally 5896 // looking like class members in C++. 5897 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 5898 D.getSourceRange().getBegin(), 5899 D.getIdentifierLoc(), II, 5900 parmDeclType, TInfo, 5901 StorageClass, StorageClassAsWritten); 5902 5903 if (D.isInvalidType()) 5904 New->setInvalidDecl(); 5905 5906 assert(S->isFunctionPrototypeScope()); 5907 assert(S->getFunctionPrototypeDepth() >= 1); 5908 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 5909 S->getNextFunctionPrototypeIndex()); 5910 5911 // Add the parameter declaration into this scope. 5912 S->AddDecl(New); 5913 if (II) 5914 IdResolver.AddDecl(New); 5915 5916 ProcessDeclAttributes(S, New, D); 5917 5918 if (New->hasAttr<BlocksAttr>()) { 5919 Diag(New->getLocation(), diag::err_block_on_nonlocal); 5920 } 5921 return New; 5922} 5923 5924/// \brief Synthesizes a variable for a parameter arising from a 5925/// typedef. 5926ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 5927 SourceLocation Loc, 5928 QualType T) { 5929 /* FIXME: setting StartLoc == Loc. 5930 Would it be worth to modify callers so as to provide proper source 5931 location for the unnamed parameters, embedding the parameter's type? */ 5932 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 5933 T, Context.getTrivialTypeSourceInfo(T, Loc), 5934 SC_None, SC_None, 0); 5935 Param->setImplicit(); 5936 return Param; 5937} 5938 5939void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 5940 ParmVarDecl * const *ParamEnd) { 5941 // Don't diagnose unused-parameter errors in template instantiations; we 5942 // will already have done so in the template itself. 5943 if (!ActiveTemplateInstantiations.empty()) 5944 return; 5945 5946 for (; Param != ParamEnd; ++Param) { 5947 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 5948 !(*Param)->hasAttr<UnusedAttr>()) { 5949 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 5950 << (*Param)->getDeclName(); 5951 } 5952 } 5953} 5954 5955void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 5956 ParmVarDecl * const *ParamEnd, 5957 QualType ReturnTy, 5958 NamedDecl *D) { 5959 if (LangOpts.NumLargeByValueCopy == 0) // No check. 5960 return; 5961 5962 // Warn if the return value is pass-by-value and larger than the specified 5963 // threshold. 5964 if (ReturnTy->isPODType()) { 5965 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 5966 if (Size > LangOpts.NumLargeByValueCopy) 5967 Diag(D->getLocation(), diag::warn_return_value_size) 5968 << D->getDeclName() << Size; 5969 } 5970 5971 // Warn if any parameter is pass-by-value and larger than the specified 5972 // threshold. 5973 for (; Param != ParamEnd; ++Param) { 5974 QualType T = (*Param)->getType(); 5975 if (!T->isPODType()) 5976 continue; 5977 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 5978 if (Size > LangOpts.NumLargeByValueCopy) 5979 Diag((*Param)->getLocation(), diag::warn_parameter_size) 5980 << (*Param)->getDeclName() << Size; 5981 } 5982} 5983 5984ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 5985 SourceLocation NameLoc, IdentifierInfo *Name, 5986 QualType T, TypeSourceInfo *TSInfo, 5987 VarDecl::StorageClass StorageClass, 5988 VarDecl::StorageClass StorageClassAsWritten) { 5989 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 5990 adjustParameterType(T), TSInfo, 5991 StorageClass, StorageClassAsWritten, 5992 0); 5993 5994 // Parameters can not be abstract class types. 5995 // For record types, this is done by the AbstractClassUsageDiagnoser once 5996 // the class has been completely parsed. 5997 if (!CurContext->isRecord() && 5998 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 5999 AbstractParamType)) 6000 New->setInvalidDecl(); 6001 6002 // Parameter declarators cannot be interface types. All ObjC objects are 6003 // passed by reference. 6004 if (T->isObjCObjectType()) { 6005 Diag(NameLoc, 6006 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 6007 New->setInvalidDecl(); 6008 } 6009 6010 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6011 // duration shall not be qualified by an address-space qualifier." 6012 // Since all parameters have automatic store duration, they can not have 6013 // an address space. 6014 if (T.getAddressSpace() != 0) { 6015 Diag(NameLoc, diag::err_arg_with_address_space); 6016 New->setInvalidDecl(); 6017 } 6018 6019 return New; 6020} 6021 6022void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6023 SourceLocation LocAfterDecls) { 6024 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6025 6026 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6027 // for a K&R function. 6028 if (!FTI.hasPrototype) { 6029 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6030 --i; 6031 if (FTI.ArgInfo[i].Param == 0) { 6032 llvm::SmallString<256> Code; 6033 llvm::raw_svector_ostream(Code) << " int " 6034 << FTI.ArgInfo[i].Ident->getName() 6035 << ";\n"; 6036 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6037 << FTI.ArgInfo[i].Ident 6038 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6039 6040 // Implicitly declare the argument as type 'int' for lack of a better 6041 // type. 6042 AttributeFactory attrs; 6043 DeclSpec DS(attrs); 6044 const char* PrevSpec; // unused 6045 unsigned DiagID; // unused 6046 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6047 PrevSpec, DiagID); 6048 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6049 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6050 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6051 } 6052 } 6053 } 6054} 6055 6056Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6057 Declarator &D) { 6058 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6059 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6060 Scope *ParentScope = FnBodyScope->getParent(); 6061 6062 Decl *DP = HandleDeclarator(ParentScope, D, 6063 MultiTemplateParamsArg(*this), 6064 /*IsFunctionDefinition=*/true); 6065 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6066} 6067 6068static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6069 // Don't warn about invalid declarations. 6070 if (FD->isInvalidDecl()) 6071 return false; 6072 6073 // Or declarations that aren't global. 6074 if (!FD->isGlobal()) 6075 return false; 6076 6077 // Don't warn about C++ member functions. 6078 if (isa<CXXMethodDecl>(FD)) 6079 return false; 6080 6081 // Don't warn about 'main'. 6082 if (FD->isMain()) 6083 return false; 6084 6085 // Don't warn about inline functions. 6086 if (FD->isInlined()) 6087 return false; 6088 6089 // Don't warn about function templates. 6090 if (FD->getDescribedFunctionTemplate()) 6091 return false; 6092 6093 // Don't warn about function template specializations. 6094 if (FD->isFunctionTemplateSpecialization()) 6095 return false; 6096 6097 bool MissingPrototype = true; 6098 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6099 Prev; Prev = Prev->getPreviousDeclaration()) { 6100 // Ignore any declarations that occur in function or method 6101 // scope, because they aren't visible from the header. 6102 if (Prev->getDeclContext()->isFunctionOrMethod()) 6103 continue; 6104 6105 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6106 break; 6107 } 6108 6109 return MissingPrototype; 6110} 6111 6112void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6113 // Don't complain if we're in GNU89 mode and the previous definition 6114 // was an extern inline function. 6115 const FunctionDecl *Definition; 6116 if (FD->isDefined(Definition) && 6117 !canRedefineFunction(Definition, getLangOptions())) { 6118 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6119 Definition->getStorageClass() == SC_Extern) 6120 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6121 << FD->getDeclName() << getLangOptions().CPlusPlus; 6122 else 6123 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6124 Diag(Definition->getLocation(), diag::note_previous_definition); 6125 } 6126} 6127 6128Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6129 // Clear the last template instantiation error context. 6130 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6131 6132 if (!D) 6133 return D; 6134 FunctionDecl *FD = 0; 6135 6136 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6137 FD = FunTmpl->getTemplatedDecl(); 6138 else 6139 FD = cast<FunctionDecl>(D); 6140 6141 // Enter a new function scope 6142 PushFunctionScope(); 6143 6144 // See if this is a redefinition. 6145 if (!FD->isLateTemplateParsed()) 6146 CheckForFunctionRedefinition(FD); 6147 6148 // Builtin functions cannot be defined. 6149 if (unsigned BuiltinID = FD->getBuiltinID()) { 6150 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6151 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6152 FD->setInvalidDecl(); 6153 } 6154 } 6155 6156 // The return type of a function definition must be complete 6157 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6158 QualType ResultType = FD->getResultType(); 6159 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6160 !FD->isInvalidDecl() && 6161 RequireCompleteType(FD->getLocation(), ResultType, 6162 diag::err_func_def_incomplete_result)) 6163 FD->setInvalidDecl(); 6164 6165 // GNU warning -Wmissing-prototypes: 6166 // Warn if a global function is defined without a previous 6167 // prototype declaration. This warning is issued even if the 6168 // definition itself provides a prototype. The aim is to detect 6169 // global functions that fail to be declared in header files. 6170 if (ShouldWarnAboutMissingPrototype(FD)) 6171 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6172 6173 if (FnBodyScope) 6174 PushDeclContext(FnBodyScope, FD); 6175 6176 // Check the validity of our function parameters 6177 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6178 /*CheckParameterNames=*/true); 6179 6180 // Introduce our parameters into the function scope 6181 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6182 ParmVarDecl *Param = FD->getParamDecl(p); 6183 Param->setOwningFunction(FD); 6184 6185 // If this has an identifier, add it to the scope stack. 6186 if (Param->getIdentifier() && FnBodyScope) { 6187 CheckShadow(FnBodyScope, Param); 6188 6189 PushOnScopeChains(Param, FnBodyScope); 6190 } 6191 } 6192 6193 // Checking attributes of current function definition 6194 // dllimport attribute. 6195 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6196 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6197 // dllimport attribute cannot be directly applied to definition. 6198 // Microsoft accepts dllimport for functions defined within class scope. 6199 if (!DA->isInherited() && 6200 !(LangOpts.Microsoft && FD->getLexicalDeclContext()->isRecord())) { 6201 Diag(FD->getLocation(), 6202 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6203 << "dllimport"; 6204 FD->setInvalidDecl(); 6205 return FD; 6206 } 6207 6208 // Visual C++ appears to not think this is an issue, so only issue 6209 // a warning when Microsoft extensions are disabled. 6210 if (!LangOpts.Microsoft) { 6211 // If a symbol previously declared dllimport is later defined, the 6212 // attribute is ignored in subsequent references, and a warning is 6213 // emitted. 6214 Diag(FD->getLocation(), 6215 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 6216 << FD->getName() << "dllimport"; 6217 } 6218 } 6219 return FD; 6220} 6221 6222/// \brief Given the set of return statements within a function body, 6223/// compute the variables that are subject to the named return value 6224/// optimization. 6225/// 6226/// Each of the variables that is subject to the named return value 6227/// optimization will be marked as NRVO variables in the AST, and any 6228/// return statement that has a marked NRVO variable as its NRVO candidate can 6229/// use the named return value optimization. 6230/// 6231/// This function applies a very simplistic algorithm for NRVO: if every return 6232/// statement in the function has the same NRVO candidate, that candidate is 6233/// the NRVO variable. 6234/// 6235/// FIXME: Employ a smarter algorithm that accounts for multiple return 6236/// statements and the lifetimes of the NRVO candidates. We should be able to 6237/// find a maximal set of NRVO variables. 6238static void ComputeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 6239 ReturnStmt **Returns = Scope->Returns.data(); 6240 6241 const VarDecl *NRVOCandidate = 0; 6242 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 6243 if (!Returns[I]->getNRVOCandidate()) 6244 return; 6245 6246 if (!NRVOCandidate) 6247 NRVOCandidate = Returns[I]->getNRVOCandidate(); 6248 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 6249 return; 6250 } 6251 6252 if (NRVOCandidate) 6253 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 6254} 6255 6256Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 6257 return ActOnFinishFunctionBody(D, move(BodyArg), false); 6258} 6259 6260Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 6261 bool IsInstantiation) { 6262 FunctionDecl *FD = 0; 6263 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 6264 if (FunTmpl) 6265 FD = FunTmpl->getTemplatedDecl(); 6266 else 6267 FD = dyn_cast_or_null<FunctionDecl>(dcl); 6268 6269 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 6270 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 6271 6272 if (FD) { 6273 FD->setBody(Body); 6274 if (FD->isMain()) { 6275 // C and C++ allow for main to automagically return 0. 6276 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6277 FD->setHasImplicitReturnZero(true); 6278 WP.disableCheckFallThrough(); 6279 } 6280 6281 if (!FD->isInvalidDecl()) { 6282 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 6283 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 6284 FD->getResultType(), FD); 6285 6286 // If this is a constructor, we need a vtable. 6287 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 6288 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 6289 6290 ComputeNRVO(Body, getCurFunction()); 6291 } 6292 6293 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 6294 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 6295 assert(MD == getCurMethodDecl() && "Method parsing confused"); 6296 MD->setBody(Body); 6297 if (Body) 6298 MD->setEndLoc(Body->getLocEnd()); 6299 if (!MD->isInvalidDecl()) { 6300 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 6301 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 6302 MD->getResultType(), MD); 6303 } 6304 } else { 6305 return 0; 6306 } 6307 6308 // Verify and clean out per-function state. 6309 if (Body) { 6310 // C++ constructors that have function-try-blocks can't have return 6311 // statements in the handlers of that block. (C++ [except.handle]p14) 6312 // Verify this. 6313 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 6314 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 6315 6316 // Verify that that gotos and switch cases don't jump into scopes illegally. 6317 // Verify that that gotos and switch cases don't jump into scopes illegally. 6318 if (getCurFunction()->NeedsScopeChecking() && 6319 !dcl->isInvalidDecl() && 6320 !hasAnyErrorsInThisFunction()) 6321 DiagnoseInvalidJumps(Body); 6322 6323 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 6324 if (!Destructor->getParent()->isDependentType()) 6325 CheckDestructor(Destructor); 6326 6327 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6328 Destructor->getParent()); 6329 } 6330 6331 // If any errors have occurred, clear out any temporaries that may have 6332 // been leftover. This ensures that these temporaries won't be picked up for 6333 // deletion in some later function. 6334 if (PP.getDiagnostics().hasErrorOccurred() || 6335 PP.getDiagnostics().getSuppressAllDiagnostics()) 6336 ExprTemporaries.clear(); 6337 else if (!isa<FunctionTemplateDecl>(dcl)) { 6338 // Since the body is valid, issue any analysis-based warnings that are 6339 // enabled. 6340 ActivePolicy = &WP; 6341 } 6342 6343 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 6344 } 6345 6346 if (!IsInstantiation) 6347 PopDeclContext(); 6348 6349 PopFunctionOrBlockScope(ActivePolicy, dcl); 6350 6351 // If any errors have occurred, clear out any temporaries that may have 6352 // been leftover. This ensures that these temporaries won't be picked up for 6353 // deletion in some later function. 6354 if (getDiagnostics().hasErrorOccurred()) 6355 ExprTemporaries.clear(); 6356 6357 return dcl; 6358} 6359 6360/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 6361/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 6362NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 6363 IdentifierInfo &II, Scope *S) { 6364 // Before we produce a declaration for an implicitly defined 6365 // function, see whether there was a locally-scoped declaration of 6366 // this name as a function or variable. If so, use that 6367 // (non-visible) declaration, and complain about it. 6368 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 6369 = LocallyScopedExternalDecls.find(&II); 6370 if (Pos != LocallyScopedExternalDecls.end()) { 6371 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 6372 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 6373 return Pos->second; 6374 } 6375 6376 // Extension in C99. Legal in C90, but warn about it. 6377 if (II.getName().startswith("__builtin_")) 6378 Diag(Loc, diag::warn_builtin_unknown) << &II; 6379 else if (getLangOptions().C99) 6380 Diag(Loc, diag::ext_implicit_function_decl) << &II; 6381 else 6382 Diag(Loc, diag::warn_implicit_function_decl) << &II; 6383 6384 // Set a Declarator for the implicit definition: int foo(); 6385 const char *Dummy; 6386 AttributeFactory attrFactory; 6387 DeclSpec DS(attrFactory); 6388 unsigned DiagID; 6389 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 6390 (void)Error; // Silence warning. 6391 assert(!Error && "Error setting up implicit decl!"); 6392 Declarator D(DS, Declarator::BlockContext); 6393 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 6394 0, 0, true, SourceLocation(), 6395 EST_None, SourceLocation(), 6396 0, 0, 0, 0, Loc, Loc, D), 6397 DS.getAttributes(), 6398 SourceLocation()); 6399 D.SetIdentifier(&II, Loc); 6400 6401 // Insert this function into translation-unit scope. 6402 6403 DeclContext *PrevDC = CurContext; 6404 CurContext = Context.getTranslationUnitDecl(); 6405 6406 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 6407 FD->setImplicit(); 6408 6409 CurContext = PrevDC; 6410 6411 AddKnownFunctionAttributes(FD); 6412 6413 return FD; 6414} 6415 6416/// \brief Adds any function attributes that we know a priori based on 6417/// the declaration of this function. 6418/// 6419/// These attributes can apply both to implicitly-declared builtins 6420/// (like __builtin___printf_chk) or to library-declared functions 6421/// like NSLog or printf. 6422void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 6423 if (FD->isInvalidDecl()) 6424 return; 6425 6426 // If this is a built-in function, map its builtin attributes to 6427 // actual attributes. 6428 if (unsigned BuiltinID = FD->getBuiltinID()) { 6429 // Handle printf-formatting attributes. 6430 unsigned FormatIdx; 6431 bool HasVAListArg; 6432 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 6433 if (!FD->getAttr<FormatAttr>()) 6434 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6435 "printf", FormatIdx+1, 6436 HasVAListArg ? 0 : FormatIdx+2)); 6437 } 6438 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 6439 HasVAListArg)) { 6440 if (!FD->getAttr<FormatAttr>()) 6441 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6442 "scanf", FormatIdx+1, 6443 HasVAListArg ? 0 : FormatIdx+2)); 6444 } 6445 6446 // Mark const if we don't care about errno and that is the only 6447 // thing preventing the function from being const. This allows 6448 // IRgen to use LLVM intrinsics for such functions. 6449 if (!getLangOptions().MathErrno && 6450 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 6451 if (!FD->getAttr<ConstAttr>()) 6452 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6453 } 6454 6455 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 6456 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 6457 if (Context.BuiltinInfo.isConst(BuiltinID)) 6458 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6459 } 6460 6461 IdentifierInfo *Name = FD->getIdentifier(); 6462 if (!Name) 6463 return; 6464 if ((!getLangOptions().CPlusPlus && 6465 FD->getDeclContext()->isTranslationUnit()) || 6466 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 6467 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 6468 LinkageSpecDecl::lang_c)) { 6469 // Okay: this could be a libc/libm/Objective-C function we know 6470 // about. 6471 } else 6472 return; 6473 6474 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 6475 // FIXME: NSLog and NSLogv should be target specific 6476 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 6477 // FIXME: We known better than our headers. 6478 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 6479 } else 6480 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6481 "printf", 1, 6482 Name->isStr("NSLogv") ? 0 : 2)); 6483 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 6484 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 6485 // target-specific builtins, perhaps? 6486 if (!FD->getAttr<FormatAttr>()) 6487 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6488 "printf", 2, 6489 Name->isStr("vasprintf") ? 0 : 3)); 6490 } 6491} 6492 6493TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 6494 TypeSourceInfo *TInfo) { 6495 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 6496 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 6497 6498 if (!TInfo) { 6499 assert(D.isInvalidType() && "no declarator info for valid type"); 6500 TInfo = Context.getTrivialTypeSourceInfo(T); 6501 } 6502 6503 // Scope manipulation handled by caller. 6504 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 6505 D.getSourceRange().getBegin(), 6506 D.getIdentifierLoc(), 6507 D.getIdentifier(), 6508 TInfo); 6509 6510 // Bail out immediately if we have an invalid declaration. 6511 if (D.isInvalidType()) { 6512 NewTD->setInvalidDecl(); 6513 return NewTD; 6514 } 6515 6516 // C++ [dcl.typedef]p8: 6517 // If the typedef declaration defines an unnamed class (or 6518 // enum), the first typedef-name declared by the declaration 6519 // to be that class type (or enum type) is used to denote the 6520 // class type (or enum type) for linkage purposes only. 6521 // We need to check whether the type was declared in the declaration. 6522 switch (D.getDeclSpec().getTypeSpecType()) { 6523 case TST_enum: 6524 case TST_struct: 6525 case TST_union: 6526 case TST_class: { 6527 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 6528 6529 // Do nothing if the tag is not anonymous or already has an 6530 // associated typedef (from an earlier typedef in this decl group). 6531 if (tagFromDeclSpec->getIdentifier()) break; 6532 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 6533 6534 // A well-formed anonymous tag must always be a TUK_Definition. 6535 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 6536 6537 // The type must match the tag exactly; no qualifiers allowed. 6538 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 6539 break; 6540 6541 // Otherwise, set this is the anon-decl typedef for the tag. 6542 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 6543 break; 6544 } 6545 6546 default: 6547 break; 6548 } 6549 6550 return NewTD; 6551} 6552 6553 6554/// \brief Determine whether a tag with a given kind is acceptable 6555/// as a redeclaration of the given tag declaration. 6556/// 6557/// \returns true if the new tag kind is acceptable, false otherwise. 6558bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 6559 TagTypeKind NewTag, 6560 SourceLocation NewTagLoc, 6561 const IdentifierInfo &Name) { 6562 // C++ [dcl.type.elab]p3: 6563 // The class-key or enum keyword present in the 6564 // elaborated-type-specifier shall agree in kind with the 6565 // declaration to which the name in the elaborated-type-specifier 6566 // refers. This rule also applies to the form of 6567 // elaborated-type-specifier that declares a class-name or 6568 // friend class since it can be construed as referring to the 6569 // definition of the class. Thus, in any 6570 // elaborated-type-specifier, the enum keyword shall be used to 6571 // refer to an enumeration (7.2), the union class-key shall be 6572 // used to refer to a union (clause 9), and either the class or 6573 // struct class-key shall be used to refer to a class (clause 9) 6574 // declared using the class or struct class-key. 6575 TagTypeKind OldTag = Previous->getTagKind(); 6576 if (OldTag == NewTag) 6577 return true; 6578 6579 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 6580 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 6581 // Warn about the struct/class tag mismatch. 6582 bool isTemplate = false; 6583 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 6584 isTemplate = Record->getDescribedClassTemplate(); 6585 6586 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 6587 << (NewTag == TTK_Class) 6588 << isTemplate << &Name 6589 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 6590 OldTag == TTK_Class? "class" : "struct"); 6591 Diag(Previous->getLocation(), diag::note_previous_use); 6592 return true; 6593 } 6594 return false; 6595} 6596 6597/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 6598/// former case, Name will be non-null. In the later case, Name will be null. 6599/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 6600/// reference/declaration/definition of a tag. 6601Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 6602 SourceLocation KWLoc, CXXScopeSpec &SS, 6603 IdentifierInfo *Name, SourceLocation NameLoc, 6604 AttributeList *Attr, AccessSpecifier AS, 6605 MultiTemplateParamsArg TemplateParameterLists, 6606 bool &OwnedDecl, bool &IsDependent, 6607 bool ScopedEnum, bool ScopedEnumUsesClassTag, 6608 TypeResult UnderlyingType) { 6609 // If this is not a definition, it must have a name. 6610 assert((Name != 0 || TUK == TUK_Definition) && 6611 "Nameless record must be a definition!"); 6612 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 6613 6614 OwnedDecl = false; 6615 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6616 6617 // FIXME: Check explicit specializations more carefully. 6618 bool isExplicitSpecialization = false; 6619 bool Invalid = false; 6620 6621 // We only need to do this matching if we have template parameters 6622 // or a scope specifier, which also conveniently avoids this work 6623 // for non-C++ cases. 6624 if (TemplateParameterLists.size() > 0 || 6625 (SS.isNotEmpty() && TUK != TUK_Reference)) { 6626 if (TemplateParameterList *TemplateParams 6627 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 6628 TemplateParameterLists.get(), 6629 TemplateParameterLists.size(), 6630 TUK == TUK_Friend, 6631 isExplicitSpecialization, 6632 Invalid)) { 6633 if (TemplateParams->size() > 0) { 6634 // This is a declaration or definition of a class template (which may 6635 // be a member of another template). 6636 6637 if (Invalid) 6638 return 0; 6639 6640 OwnedDecl = false; 6641 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 6642 SS, Name, NameLoc, Attr, 6643 TemplateParams, AS, 6644 TemplateParameterLists.size() - 1, 6645 (TemplateParameterList**) TemplateParameterLists.release()); 6646 return Result.get(); 6647 } else { 6648 // The "template<>" header is extraneous. 6649 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6650 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6651 isExplicitSpecialization = true; 6652 } 6653 } 6654 } 6655 6656 // Figure out the underlying type if this a enum declaration. We need to do 6657 // this early, because it's needed to detect if this is an incompatible 6658 // redeclaration. 6659 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 6660 6661 if (Kind == TTK_Enum) { 6662 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 6663 // No underlying type explicitly specified, or we failed to parse the 6664 // type, default to int. 6665 EnumUnderlying = Context.IntTy.getTypePtr(); 6666 else if (UnderlyingType.get()) { 6667 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 6668 // integral type; any cv-qualification is ignored. 6669 TypeSourceInfo *TI = 0; 6670 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 6671 EnumUnderlying = TI; 6672 6673 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 6674 6675 if (!T->isDependentType() && !T->isIntegralType(Context)) { 6676 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 6677 << T; 6678 // Recover by falling back to int. 6679 EnumUnderlying = Context.IntTy.getTypePtr(); 6680 } 6681 6682 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 6683 UPPC_FixedUnderlyingType)) 6684 EnumUnderlying = Context.IntTy.getTypePtr(); 6685 6686 } else if (getLangOptions().Microsoft) 6687 // Microsoft enums are always of int type. 6688 EnumUnderlying = Context.IntTy.getTypePtr(); 6689 } 6690 6691 DeclContext *SearchDC = CurContext; 6692 DeclContext *DC = CurContext; 6693 bool isStdBadAlloc = false; 6694 6695 RedeclarationKind Redecl = ForRedeclaration; 6696 if (TUK == TUK_Friend || TUK == TUK_Reference) 6697 Redecl = NotForRedeclaration; 6698 6699 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 6700 6701 if (Name && SS.isNotEmpty()) { 6702 // We have a nested-name tag ('struct foo::bar'). 6703 6704 // Check for invalid 'foo::'. 6705 if (SS.isInvalid()) { 6706 Name = 0; 6707 goto CreateNewDecl; 6708 } 6709 6710 // If this is a friend or a reference to a class in a dependent 6711 // context, don't try to make a decl for it. 6712 if (TUK == TUK_Friend || TUK == TUK_Reference) { 6713 DC = computeDeclContext(SS, false); 6714 if (!DC) { 6715 IsDependent = true; 6716 return 0; 6717 } 6718 } else { 6719 DC = computeDeclContext(SS, true); 6720 if (!DC) { 6721 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 6722 << SS.getRange(); 6723 return 0; 6724 } 6725 } 6726 6727 if (RequireCompleteDeclContext(SS, DC)) 6728 return 0; 6729 6730 SearchDC = DC; 6731 // Look-up name inside 'foo::'. 6732 LookupQualifiedName(Previous, DC); 6733 6734 if (Previous.isAmbiguous()) 6735 return 0; 6736 6737 if (Previous.empty()) { 6738 // Name lookup did not find anything. However, if the 6739 // nested-name-specifier refers to the current instantiation, 6740 // and that current instantiation has any dependent base 6741 // classes, we might find something at instantiation time: treat 6742 // this as a dependent elaborated-type-specifier. 6743 // But this only makes any sense for reference-like lookups. 6744 if (Previous.wasNotFoundInCurrentInstantiation() && 6745 (TUK == TUK_Reference || TUK == TUK_Friend)) { 6746 IsDependent = true; 6747 return 0; 6748 } 6749 6750 // A tag 'foo::bar' must already exist. 6751 Diag(NameLoc, diag::err_not_tag_in_scope) 6752 << Kind << Name << DC << SS.getRange(); 6753 Name = 0; 6754 Invalid = true; 6755 goto CreateNewDecl; 6756 } 6757 } else if (Name) { 6758 // If this is a named struct, check to see if there was a previous forward 6759 // declaration or definition. 6760 // FIXME: We're looking into outer scopes here, even when we 6761 // shouldn't be. Doing so can result in ambiguities that we 6762 // shouldn't be diagnosing. 6763 LookupName(Previous, S); 6764 6765 if (Previous.isAmbiguous() && TUK == TUK_Definition) { 6766 LookupResult::Filter F = Previous.makeFilter(); 6767 while (F.hasNext()) { 6768 NamedDecl *ND = F.next(); 6769 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 6770 F.erase(); 6771 } 6772 F.done(); 6773 6774 if (Previous.isAmbiguous()) 6775 return 0; 6776 } 6777 6778 // Note: there used to be some attempt at recovery here. 6779 if (Previous.isAmbiguous()) 6780 return 0; 6781 6782 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 6783 // FIXME: This makes sure that we ignore the contexts associated 6784 // with C structs, unions, and enums when looking for a matching 6785 // tag declaration or definition. See the similar lookup tweak 6786 // in Sema::LookupName; is there a better way to deal with this? 6787 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 6788 SearchDC = SearchDC->getParent(); 6789 } 6790 } else if (S->isFunctionPrototypeScope()) { 6791 // If this is an enum declaration in function prototype scope, set its 6792 // initial context to the translation unit. 6793 SearchDC = Context.getTranslationUnitDecl(); 6794 } 6795 6796 if (Previous.isSingleResult() && 6797 Previous.getFoundDecl()->isTemplateParameter()) { 6798 // Maybe we will complain about the shadowed template parameter. 6799 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 6800 // Just pretend that we didn't see the previous declaration. 6801 Previous.clear(); 6802 } 6803 6804 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 6805 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 6806 // This is a declaration of or a reference to "std::bad_alloc". 6807 isStdBadAlloc = true; 6808 6809 if (Previous.empty() && StdBadAlloc) { 6810 // std::bad_alloc has been implicitly declared (but made invisible to 6811 // name lookup). Fill in this implicit declaration as the previous 6812 // declaration, so that the declarations get chained appropriately. 6813 Previous.addDecl(getStdBadAlloc()); 6814 } 6815 } 6816 6817 // If we didn't find a previous declaration, and this is a reference 6818 // (or friend reference), move to the correct scope. In C++, we 6819 // also need to do a redeclaration lookup there, just in case 6820 // there's a shadow friend decl. 6821 if (Name && Previous.empty() && 6822 (TUK == TUK_Reference || TUK == TUK_Friend)) { 6823 if (Invalid) goto CreateNewDecl; 6824 assert(SS.isEmpty()); 6825 6826 if (TUK == TUK_Reference) { 6827 // C++ [basic.scope.pdecl]p5: 6828 // -- for an elaborated-type-specifier of the form 6829 // 6830 // class-key identifier 6831 // 6832 // if the elaborated-type-specifier is used in the 6833 // decl-specifier-seq or parameter-declaration-clause of a 6834 // function defined in namespace scope, the identifier is 6835 // declared as a class-name in the namespace that contains 6836 // the declaration; otherwise, except as a friend 6837 // declaration, the identifier is declared in the smallest 6838 // non-class, non-function-prototype scope that contains the 6839 // declaration. 6840 // 6841 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 6842 // C structs and unions. 6843 // 6844 // It is an error in C++ to declare (rather than define) an enum 6845 // type, including via an elaborated type specifier. We'll 6846 // diagnose that later; for now, declare the enum in the same 6847 // scope as we would have picked for any other tag type. 6848 // 6849 // GNU C also supports this behavior as part of its incomplete 6850 // enum types extension, while GNU C++ does not. 6851 // 6852 // Find the context where we'll be declaring the tag. 6853 // FIXME: We would like to maintain the current DeclContext as the 6854 // lexical context, 6855 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 6856 SearchDC = SearchDC->getParent(); 6857 6858 // Find the scope where we'll be declaring the tag. 6859 while (S->isClassScope() || 6860 (getLangOptions().CPlusPlus && 6861 S->isFunctionPrototypeScope()) || 6862 ((S->getFlags() & Scope::DeclScope) == 0) || 6863 (S->getEntity() && 6864 ((DeclContext *)S->getEntity())->isTransparentContext())) 6865 S = S->getParent(); 6866 } else { 6867 assert(TUK == TUK_Friend); 6868 // C++ [namespace.memdef]p3: 6869 // If a friend declaration in a non-local class first declares a 6870 // class or function, the friend class or function is a member of 6871 // the innermost enclosing namespace. 6872 SearchDC = SearchDC->getEnclosingNamespaceContext(); 6873 } 6874 6875 // In C++, we need to do a redeclaration lookup to properly 6876 // diagnose some problems. 6877 if (getLangOptions().CPlusPlus) { 6878 Previous.setRedeclarationKind(ForRedeclaration); 6879 LookupQualifiedName(Previous, SearchDC); 6880 } 6881 } 6882 6883 if (!Previous.empty()) { 6884 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 6885 6886 // It's okay to have a tag decl in the same scope as a typedef 6887 // which hides a tag decl in the same scope. Finding this 6888 // insanity with a redeclaration lookup can only actually happen 6889 // in C++. 6890 // 6891 // This is also okay for elaborated-type-specifiers, which is 6892 // technically forbidden by the current standard but which is 6893 // okay according to the likely resolution of an open issue; 6894 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 6895 if (getLangOptions().CPlusPlus) { 6896 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 6897 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 6898 TagDecl *Tag = TT->getDecl(); 6899 if (Tag->getDeclName() == Name && 6900 Tag->getDeclContext()->getRedeclContext() 6901 ->Equals(TD->getDeclContext()->getRedeclContext())) { 6902 PrevDecl = Tag; 6903 Previous.clear(); 6904 Previous.addDecl(Tag); 6905 Previous.resolveKind(); 6906 } 6907 } 6908 } 6909 } 6910 6911 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 6912 // If this is a use of a previous tag, or if the tag is already declared 6913 // in the same scope (so that the definition/declaration completes or 6914 // rementions the tag), reuse the decl. 6915 if (TUK == TUK_Reference || TUK == TUK_Friend || 6916 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 6917 // Make sure that this wasn't declared as an enum and now used as a 6918 // struct or something similar. 6919 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 6920 bool SafeToContinue 6921 = (PrevTagDecl->getTagKind() != TTK_Enum && 6922 Kind != TTK_Enum); 6923 if (SafeToContinue) 6924 Diag(KWLoc, diag::err_use_with_wrong_tag) 6925 << Name 6926 << FixItHint::CreateReplacement(SourceRange(KWLoc), 6927 PrevTagDecl->getKindName()); 6928 else 6929 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 6930 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6931 6932 if (SafeToContinue) 6933 Kind = PrevTagDecl->getTagKind(); 6934 else { 6935 // Recover by making this an anonymous redefinition. 6936 Name = 0; 6937 Previous.clear(); 6938 Invalid = true; 6939 } 6940 } 6941 6942 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 6943 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 6944 6945 // All conflicts with previous declarations are recovered by 6946 // returning the previous declaration. 6947 if (ScopedEnum != PrevEnum->isScoped()) { 6948 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 6949 << PrevEnum->isScoped(); 6950 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6951 return PrevTagDecl; 6952 } 6953 else if (EnumUnderlying && PrevEnum->isFixed()) { 6954 QualType T; 6955 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 6956 T = TI->getType(); 6957 else 6958 T = QualType(EnumUnderlying.get<const Type*>(), 0); 6959 6960 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 6961 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 6962 diag::err_enum_redeclare_type_mismatch) 6963 << T 6964 << PrevEnum->getIntegerType(); 6965 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6966 return PrevTagDecl; 6967 } 6968 } 6969 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 6970 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 6971 << PrevEnum->isFixed(); 6972 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6973 return PrevTagDecl; 6974 } 6975 } 6976 6977 if (!Invalid) { 6978 // If this is a use, just return the declaration we found. 6979 6980 // FIXME: In the future, return a variant or some other clue 6981 // for the consumer of this Decl to know it doesn't own it. 6982 // For our current ASTs this shouldn't be a problem, but will 6983 // need to be changed with DeclGroups. 6984 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) || 6985 TUK == TUK_Friend) 6986 return PrevTagDecl; 6987 6988 // Diagnose attempts to redefine a tag. 6989 if (TUK == TUK_Definition) { 6990 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 6991 // If we're defining a specialization and the previous definition 6992 // is from an implicit instantiation, don't emit an error 6993 // here; we'll catch this in the general case below. 6994 if (!isExplicitSpecialization || 6995 !isa<CXXRecordDecl>(Def) || 6996 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 6997 == TSK_ExplicitSpecialization) { 6998 Diag(NameLoc, diag::err_redefinition) << Name; 6999 Diag(Def->getLocation(), diag::note_previous_definition); 7000 // If this is a redefinition, recover by making this 7001 // struct be anonymous, which will make any later 7002 // references get the previous definition. 7003 Name = 0; 7004 Previous.clear(); 7005 Invalid = true; 7006 } 7007 } else { 7008 // If the type is currently being defined, complain 7009 // about a nested redefinition. 7010 const TagType *Tag 7011 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7012 if (Tag->isBeingDefined()) { 7013 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7014 Diag(PrevTagDecl->getLocation(), 7015 diag::note_previous_definition); 7016 Name = 0; 7017 Previous.clear(); 7018 Invalid = true; 7019 } 7020 } 7021 7022 // Okay, this is definition of a previously declared or referenced 7023 // tag PrevDecl. We're going to create a new Decl for it. 7024 } 7025 } 7026 // If we get here we have (another) forward declaration or we 7027 // have a definition. Just create a new decl. 7028 7029 } else { 7030 // If we get here, this is a definition of a new tag type in a nested 7031 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7032 // new decl/type. We set PrevDecl to NULL so that the entities 7033 // have distinct types. 7034 Previous.clear(); 7035 } 7036 // If we get here, we're going to create a new Decl. If PrevDecl 7037 // is non-NULL, it's a definition of the tag declared by 7038 // PrevDecl. If it's NULL, we have a new definition. 7039 7040 7041 // Otherwise, PrevDecl is not a tag, but was found with tag 7042 // lookup. This is only actually possible in C++, where a few 7043 // things like templates still live in the tag namespace. 7044 } else { 7045 assert(getLangOptions().CPlusPlus); 7046 7047 // Use a better diagnostic if an elaborated-type-specifier 7048 // found the wrong kind of type on the first 7049 // (non-redeclaration) lookup. 7050 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7051 !Previous.isForRedeclaration()) { 7052 unsigned Kind = 0; 7053 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7054 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7055 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7056 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7057 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7058 Invalid = true; 7059 7060 // Otherwise, only diagnose if the declaration is in scope. 7061 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7062 isExplicitSpecialization)) { 7063 // do nothing 7064 7065 // Diagnose implicit declarations introduced by elaborated types. 7066 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7067 unsigned Kind = 0; 7068 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7069 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7070 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7071 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7072 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7073 Invalid = true; 7074 7075 // Otherwise it's a declaration. Call out a particularly common 7076 // case here. 7077 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7078 unsigned Kind = 0; 7079 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7080 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7081 << Name << Kind << TND->getUnderlyingType(); 7082 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7083 Invalid = true; 7084 7085 // Otherwise, diagnose. 7086 } else { 7087 // The tag name clashes with something else in the target scope, 7088 // issue an error and recover by making this tag be anonymous. 7089 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7090 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7091 Name = 0; 7092 Invalid = true; 7093 } 7094 7095 // The existing declaration isn't relevant to us; we're in a 7096 // new scope, so clear out the previous declaration. 7097 Previous.clear(); 7098 } 7099 } 7100 7101CreateNewDecl: 7102 7103 TagDecl *PrevDecl = 0; 7104 if (Previous.isSingleResult()) 7105 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 7106 7107 // If there is an identifier, use the location of the identifier as the 7108 // location of the decl, otherwise use the location of the struct/union 7109 // keyword. 7110 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 7111 7112 // Otherwise, create a new declaration. If there is a previous 7113 // declaration of the same entity, the two will be linked via 7114 // PrevDecl. 7115 TagDecl *New; 7116 7117 bool IsForwardReference = false; 7118 if (Kind == TTK_Enum) { 7119 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7120 // enum X { A, B, C } D; D should chain to X. 7121 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 7122 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 7123 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 7124 // If this is an undefined enum, warn. 7125 if (TUK != TUK_Definition && !Invalid) { 7126 TagDecl *Def; 7127 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 7128 // C++0x: 7.2p2: opaque-enum-declaration. 7129 // Conflicts are diagnosed above. Do nothing. 7130 } 7131 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 7132 Diag(Loc, diag::ext_forward_ref_enum_def) 7133 << New; 7134 Diag(Def->getLocation(), diag::note_previous_definition); 7135 } else { 7136 unsigned DiagID = diag::ext_forward_ref_enum; 7137 if (getLangOptions().Microsoft) 7138 DiagID = diag::ext_ms_forward_ref_enum; 7139 else if (getLangOptions().CPlusPlus) 7140 DiagID = diag::err_forward_ref_enum; 7141 Diag(Loc, DiagID); 7142 7143 // If this is a forward-declared reference to an enumeration, make a 7144 // note of it; we won't actually be introducing the declaration into 7145 // the declaration context. 7146 if (TUK == TUK_Reference) 7147 IsForwardReference = true; 7148 } 7149 } 7150 7151 if (EnumUnderlying) { 7152 EnumDecl *ED = cast<EnumDecl>(New); 7153 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7154 ED->setIntegerTypeSourceInfo(TI); 7155 else 7156 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 7157 ED->setPromotionType(ED->getIntegerType()); 7158 } 7159 7160 } else { 7161 // struct/union/class 7162 7163 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7164 // struct X { int A; } D; D should chain to X. 7165 if (getLangOptions().CPlusPlus) { 7166 // FIXME: Look for a way to use RecordDecl for simple structs. 7167 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7168 cast_or_null<CXXRecordDecl>(PrevDecl)); 7169 7170 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 7171 StdBadAlloc = cast<CXXRecordDecl>(New); 7172 } else 7173 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7174 cast_or_null<RecordDecl>(PrevDecl)); 7175 } 7176 7177 // Maybe add qualifier info. 7178 if (SS.isNotEmpty()) { 7179 if (SS.isSet()) { 7180 New->setQualifierInfo(SS.getWithLocInContext(Context)); 7181 if (TemplateParameterLists.size() > 0) { 7182 New->setTemplateParameterListsInfo(Context, 7183 TemplateParameterLists.size(), 7184 (TemplateParameterList**) TemplateParameterLists.release()); 7185 } 7186 } 7187 else 7188 Invalid = true; 7189 } 7190 7191 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 7192 // Add alignment attributes if necessary; these attributes are checked when 7193 // the ASTContext lays out the structure. 7194 // 7195 // It is important for implementing the correct semantics that this 7196 // happen here (in act on tag decl). The #pragma pack stack is 7197 // maintained as a result of parser callbacks which can occur at 7198 // many points during the parsing of a struct declaration (because 7199 // the #pragma tokens are effectively skipped over during the 7200 // parsing of the struct). 7201 AddAlignmentAttributesForRecord(RD); 7202 7203 AddMsStructLayoutForRecord(RD); 7204 } 7205 7206 // If this is a specialization of a member class (of a class template), 7207 // check the specialization. 7208 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 7209 Invalid = true; 7210 7211 if (Invalid) 7212 New->setInvalidDecl(); 7213 7214 if (Attr) 7215 ProcessDeclAttributeList(S, New, Attr); 7216 7217 // If we're declaring or defining a tag in function prototype scope 7218 // in C, note that this type can only be used within the function. 7219 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 7220 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 7221 7222 // Set the lexical context. If the tag has a C++ scope specifier, the 7223 // lexical context will be different from the semantic context. 7224 New->setLexicalDeclContext(CurContext); 7225 7226 // Mark this as a friend decl if applicable. 7227 if (TUK == TUK_Friend) 7228 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 7229 7230 // Set the access specifier. 7231 if (!Invalid && SearchDC->isRecord()) 7232 SetMemberAccessSpecifier(New, PrevDecl, AS); 7233 7234 if (TUK == TUK_Definition) 7235 New->startDefinition(); 7236 7237 // If this has an identifier, add it to the scope stack. 7238 if (TUK == TUK_Friend) { 7239 // We might be replacing an existing declaration in the lookup tables; 7240 // if so, borrow its access specifier. 7241 if (PrevDecl) 7242 New->setAccess(PrevDecl->getAccess()); 7243 7244 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 7245 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7246 if (Name) // can be null along some error paths 7247 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7248 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 7249 } else if (Name) { 7250 S = getNonFieldDeclScope(S); 7251 PushOnScopeChains(New, S, !IsForwardReference); 7252 if (IsForwardReference) 7253 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7254 7255 } else { 7256 CurContext->addDecl(New); 7257 } 7258 7259 // If this is the C FILE type, notify the AST context. 7260 if (IdentifierInfo *II = New->getIdentifier()) 7261 if (!New->isInvalidDecl() && 7262 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 7263 II->isStr("FILE")) 7264 Context.setFILEDecl(New); 7265 7266 OwnedDecl = true; 7267 return New; 7268} 7269 7270void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 7271 AdjustDeclIfTemplate(TagD); 7272 TagDecl *Tag = cast<TagDecl>(TagD); 7273 7274 // Enter the tag context. 7275 PushDeclContext(S, Tag); 7276} 7277 7278void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 7279 SourceLocation FinalLoc, 7280 SourceLocation LBraceLoc) { 7281 AdjustDeclIfTemplate(TagD); 7282 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 7283 7284 FieldCollector->StartClass(); 7285 7286 if (!Record->getIdentifier()) 7287 return; 7288 7289 if (FinalLoc.isValid()) 7290 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 7291 7292 // C++ [class]p2: 7293 // [...] The class-name is also inserted into the scope of the 7294 // class itself; this is known as the injected-class-name. For 7295 // purposes of access checking, the injected-class-name is treated 7296 // as if it were a public member name. 7297 CXXRecordDecl *InjectedClassName 7298 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 7299 Record->getLocStart(), Record->getLocation(), 7300 Record->getIdentifier(), 7301 /*PrevDecl=*/0, 7302 /*DelayTypeCreation=*/true); 7303 Context.getTypeDeclType(InjectedClassName, Record); 7304 InjectedClassName->setImplicit(); 7305 InjectedClassName->setAccess(AS_public); 7306 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 7307 InjectedClassName->setDescribedClassTemplate(Template); 7308 PushOnScopeChains(InjectedClassName, S); 7309 assert(InjectedClassName->isInjectedClassName() && 7310 "Broken injected-class-name"); 7311} 7312 7313void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 7314 SourceLocation RBraceLoc) { 7315 AdjustDeclIfTemplate(TagD); 7316 TagDecl *Tag = cast<TagDecl>(TagD); 7317 Tag->setRBraceLoc(RBraceLoc); 7318 7319 if (isa<CXXRecordDecl>(Tag)) 7320 FieldCollector->FinishClass(); 7321 7322 // Exit this scope of this tag's definition. 7323 PopDeclContext(); 7324 7325 // Notify the consumer that we've defined a tag. 7326 Consumer.HandleTagDeclDefinition(Tag); 7327} 7328 7329void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 7330 AdjustDeclIfTemplate(TagD); 7331 TagDecl *Tag = cast<TagDecl>(TagD); 7332 Tag->setInvalidDecl(); 7333 7334 // We're undoing ActOnTagStartDefinition here, not 7335 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 7336 // the FieldCollector. 7337 7338 PopDeclContext(); 7339} 7340 7341// Note that FieldName may be null for anonymous bitfields. 7342bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 7343 QualType FieldTy, const Expr *BitWidth, 7344 bool *ZeroWidth) { 7345 // Default to true; that shouldn't confuse checks for emptiness 7346 if (ZeroWidth) 7347 *ZeroWidth = true; 7348 7349 // C99 6.7.2.1p4 - verify the field type. 7350 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 7351 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 7352 // Handle incomplete types with specific error. 7353 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 7354 return true; 7355 if (FieldName) 7356 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 7357 << FieldName << FieldTy << BitWidth->getSourceRange(); 7358 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 7359 << FieldTy << BitWidth->getSourceRange(); 7360 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 7361 UPPC_BitFieldWidth)) 7362 return true; 7363 7364 // If the bit-width is type- or value-dependent, don't try to check 7365 // it now. 7366 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 7367 return false; 7368 7369 llvm::APSInt Value; 7370 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 7371 return true; 7372 7373 if (Value != 0 && ZeroWidth) 7374 *ZeroWidth = false; 7375 7376 // Zero-width bitfield is ok for anonymous field. 7377 if (Value == 0 && FieldName) 7378 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 7379 7380 if (Value.isSigned() && Value.isNegative()) { 7381 if (FieldName) 7382 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 7383 << FieldName << Value.toString(10); 7384 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 7385 << Value.toString(10); 7386 } 7387 7388 if (!FieldTy->isDependentType()) { 7389 uint64_t TypeSize = Context.getTypeSize(FieldTy); 7390 if (Value.getZExtValue() > TypeSize) { 7391 if (!getLangOptions().CPlusPlus) { 7392 if (FieldName) 7393 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 7394 << FieldName << (unsigned)Value.getZExtValue() 7395 << (unsigned)TypeSize; 7396 7397 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 7398 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7399 } 7400 7401 if (FieldName) 7402 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 7403 << FieldName << (unsigned)Value.getZExtValue() 7404 << (unsigned)TypeSize; 7405 else 7406 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 7407 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7408 } 7409 } 7410 7411 return false; 7412} 7413 7414/// ActOnField - Each field of a struct/union/class is passed into this in order 7415/// to create a FieldDecl object for it. 7416Decl *Sema::ActOnField(Scope *S, Decl *TagD, 7417 SourceLocation DeclStart, 7418 Declarator &D, ExprTy *BitfieldWidth) { 7419 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 7420 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 7421 AS_public); 7422 return Res; 7423} 7424 7425/// HandleField - Analyze a field of a C struct or a C++ data member. 7426/// 7427FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 7428 SourceLocation DeclStart, 7429 Declarator &D, Expr *BitWidth, 7430 AccessSpecifier AS) { 7431 IdentifierInfo *II = D.getIdentifier(); 7432 SourceLocation Loc = DeclStart; 7433 if (II) Loc = D.getIdentifierLoc(); 7434 7435 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7436 QualType T = TInfo->getType(); 7437 if (getLangOptions().CPlusPlus) { 7438 CheckExtraCXXDefaultArguments(D); 7439 7440 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 7441 UPPC_DataMemberType)) { 7442 D.setInvalidType(); 7443 T = Context.IntTy; 7444 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 7445 } 7446 } 7447 7448 DiagnoseFunctionSpecifiers(D); 7449 7450 if (D.getDeclSpec().isThreadSpecified()) 7451 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 7452 7453 // Check to see if this name was declared as a member previously 7454 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 7455 LookupName(Previous, S); 7456 assert((Previous.empty() || Previous.isOverloadedResult() || 7457 Previous.isSingleResult()) 7458 && "Lookup of member name should be either overloaded, single or null"); 7459 7460 // If the name is overloaded then get any declaration else get the single result 7461 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 7462 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 7463 7464 if (PrevDecl && PrevDecl->isTemplateParameter()) { 7465 // Maybe we will complain about the shadowed template parameter. 7466 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7467 // Just pretend that we didn't see the previous declaration. 7468 PrevDecl = 0; 7469 } 7470 7471 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 7472 PrevDecl = 0; 7473 7474 bool Mutable 7475 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 7476 SourceLocation TSSL = D.getSourceRange().getBegin(); 7477 FieldDecl *NewFD 7478 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 7479 AS, PrevDecl, &D); 7480 7481 if (NewFD->isInvalidDecl()) 7482 Record->setInvalidDecl(); 7483 7484 if (NewFD->isInvalidDecl() && PrevDecl) { 7485 // Don't introduce NewFD into scope; there's already something 7486 // with the same name in the same scope. 7487 } else if (II) { 7488 PushOnScopeChains(NewFD, S); 7489 } else 7490 Record->addDecl(NewFD); 7491 7492 return NewFD; 7493} 7494 7495/// \brief Build a new FieldDecl and check its well-formedness. 7496/// 7497/// This routine builds a new FieldDecl given the fields name, type, 7498/// record, etc. \p PrevDecl should refer to any previous declaration 7499/// with the same name and in the same scope as the field to be 7500/// created. 7501/// 7502/// \returns a new FieldDecl. 7503/// 7504/// \todo The Declarator argument is a hack. It will be removed once 7505FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 7506 TypeSourceInfo *TInfo, 7507 RecordDecl *Record, SourceLocation Loc, 7508 bool Mutable, Expr *BitWidth, 7509 SourceLocation TSSL, 7510 AccessSpecifier AS, NamedDecl *PrevDecl, 7511 Declarator *D) { 7512 IdentifierInfo *II = Name.getAsIdentifierInfo(); 7513 bool InvalidDecl = false; 7514 if (D) InvalidDecl = D->isInvalidType(); 7515 7516 // If we receive a broken type, recover by assuming 'int' and 7517 // marking this declaration as invalid. 7518 if (T.isNull()) { 7519 InvalidDecl = true; 7520 T = Context.IntTy; 7521 } 7522 7523 QualType EltTy = Context.getBaseElementType(T); 7524 if (!EltTy->isDependentType() && 7525 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 7526 // Fields of incomplete type force their record to be invalid. 7527 Record->setInvalidDecl(); 7528 InvalidDecl = true; 7529 } 7530 7531 // C99 6.7.2.1p8: A member of a structure or union may have any type other 7532 // than a variably modified type. 7533 if (!InvalidDecl && T->isVariablyModifiedType()) { 7534 bool SizeIsNegative; 7535 llvm::APSInt Oversized; 7536 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 7537 SizeIsNegative, 7538 Oversized); 7539 if (!FixedTy.isNull()) { 7540 Diag(Loc, diag::warn_illegal_constant_array_size); 7541 T = FixedTy; 7542 } else { 7543 if (SizeIsNegative) 7544 Diag(Loc, diag::err_typecheck_negative_array_size); 7545 else if (Oversized.getBoolValue()) 7546 Diag(Loc, diag::err_array_too_large) 7547 << Oversized.toString(10); 7548 else 7549 Diag(Loc, diag::err_typecheck_field_variable_size); 7550 InvalidDecl = true; 7551 } 7552 } 7553 7554 // Fields can not have abstract class types 7555 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 7556 diag::err_abstract_type_in_decl, 7557 AbstractFieldType)) 7558 InvalidDecl = true; 7559 7560 bool ZeroWidth = false; 7561 // If this is declared as a bit-field, check the bit-field. 7562 if (!InvalidDecl && BitWidth && 7563 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 7564 InvalidDecl = true; 7565 BitWidth = 0; 7566 ZeroWidth = false; 7567 } 7568 7569 // Check that 'mutable' is consistent with the type of the declaration. 7570 if (!InvalidDecl && Mutable) { 7571 unsigned DiagID = 0; 7572 if (T->isReferenceType()) 7573 DiagID = diag::err_mutable_reference; 7574 else if (T.isConstQualified()) 7575 DiagID = diag::err_mutable_const; 7576 7577 if (DiagID) { 7578 SourceLocation ErrLoc = Loc; 7579 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 7580 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 7581 Diag(ErrLoc, DiagID); 7582 Mutable = false; 7583 InvalidDecl = true; 7584 } 7585 } 7586 7587 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 7588 BitWidth, Mutable); 7589 if (InvalidDecl) 7590 NewFD->setInvalidDecl(); 7591 7592 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 7593 Diag(Loc, diag::err_duplicate_member) << II; 7594 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7595 NewFD->setInvalidDecl(); 7596 } 7597 7598 if (!InvalidDecl && getLangOptions().CPlusPlus) { 7599 if (Record->isUnion()) { 7600 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 7601 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 7602 if (RDecl->getDefinition()) { 7603 // C++ [class.union]p1: An object of a class with a non-trivial 7604 // constructor, a non-trivial copy constructor, a non-trivial 7605 // destructor, or a non-trivial copy assignment operator 7606 // cannot be a member of a union, nor can an array of such 7607 // objects. 7608 // TODO: C++0x alters this restriction significantly. 7609 if (CheckNontrivialField(NewFD)) 7610 NewFD->setInvalidDecl(); 7611 } 7612 } 7613 7614 // C++ [class.union]p1: If a union contains a member of reference type, 7615 // the program is ill-formed. 7616 if (EltTy->isReferenceType()) { 7617 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 7618 << NewFD->getDeclName() << EltTy; 7619 NewFD->setInvalidDecl(); 7620 } 7621 } 7622 } 7623 7624 // FIXME: We need to pass in the attributes given an AST 7625 // representation, not a parser representation. 7626 if (D) 7627 // FIXME: What to pass instead of TUScope? 7628 ProcessDeclAttributes(TUScope, NewFD, *D); 7629 7630 if (T.isObjCGCWeak()) 7631 Diag(Loc, diag::warn_attribute_weak_on_field); 7632 7633 NewFD->setAccess(AS); 7634 return NewFD; 7635} 7636 7637bool Sema::CheckNontrivialField(FieldDecl *FD) { 7638 assert(FD); 7639 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 7640 7641 if (FD->isInvalidDecl()) 7642 return true; 7643 7644 QualType EltTy = Context.getBaseElementType(FD->getType()); 7645 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 7646 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 7647 if (RDecl->getDefinition()) { 7648 // We check for copy constructors before constructors 7649 // because otherwise we'll never get complaints about 7650 // copy constructors. 7651 7652 CXXSpecialMember member = CXXInvalid; 7653 if (!RDecl->hasTrivialCopyConstructor()) 7654 member = CXXCopyConstructor; 7655 else if (!RDecl->hasTrivialConstructor()) 7656 member = CXXConstructor; 7657 else if (!RDecl->hasTrivialCopyAssignment()) 7658 member = CXXCopyAssignment; 7659 else if (!RDecl->hasTrivialDestructor()) 7660 member = CXXDestructor; 7661 7662 if (member != CXXInvalid) { 7663 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 7664 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 7665 DiagnoseNontrivial(RT, member); 7666 return true; 7667 } 7668 } 7669 } 7670 7671 return false; 7672} 7673 7674/// DiagnoseNontrivial - Given that a class has a non-trivial 7675/// special member, figure out why. 7676void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 7677 QualType QT(T, 0U); 7678 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 7679 7680 // Check whether the member was user-declared. 7681 switch (member) { 7682 case CXXInvalid: 7683 break; 7684 7685 case CXXConstructor: 7686 if (RD->hasUserDeclaredConstructor()) { 7687 typedef CXXRecordDecl::ctor_iterator ctor_iter; 7688 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 7689 const FunctionDecl *body = 0; 7690 ci->hasBody(body); 7691 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 7692 SourceLocation CtorLoc = ci->getLocation(); 7693 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7694 return; 7695 } 7696 } 7697 7698 assert(0 && "found no user-declared constructors"); 7699 return; 7700 } 7701 break; 7702 7703 case CXXCopyConstructor: 7704 if (RD->hasUserDeclaredCopyConstructor()) { 7705 SourceLocation CtorLoc = 7706 RD->getCopyConstructor(Context, 0)->getLocation(); 7707 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7708 return; 7709 } 7710 break; 7711 7712 case CXXCopyAssignment: 7713 if (RD->hasUserDeclaredCopyAssignment()) { 7714 // FIXME: this should use the location of the copy 7715 // assignment, not the type. 7716 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 7717 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 7718 return; 7719 } 7720 break; 7721 7722 case CXXDestructor: 7723 if (RD->hasUserDeclaredDestructor()) { 7724 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 7725 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7726 return; 7727 } 7728 break; 7729 } 7730 7731 typedef CXXRecordDecl::base_class_iterator base_iter; 7732 7733 // Virtual bases and members inhibit trivial copying/construction, 7734 // but not trivial destruction. 7735 if (member != CXXDestructor) { 7736 // Check for virtual bases. vbases includes indirect virtual bases, 7737 // so we just iterate through the direct bases. 7738 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 7739 if (bi->isVirtual()) { 7740 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 7741 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 7742 return; 7743 } 7744 7745 // Check for virtual methods. 7746 typedef CXXRecordDecl::method_iterator meth_iter; 7747 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 7748 ++mi) { 7749 if (mi->isVirtual()) { 7750 SourceLocation MLoc = mi->getSourceRange().getBegin(); 7751 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 7752 return; 7753 } 7754 } 7755 } 7756 7757 bool (CXXRecordDecl::*hasTrivial)() const; 7758 switch (member) { 7759 case CXXConstructor: 7760 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 7761 case CXXCopyConstructor: 7762 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 7763 case CXXCopyAssignment: 7764 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 7765 case CXXDestructor: 7766 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 7767 default: 7768 assert(0 && "unexpected special member"); return; 7769 } 7770 7771 // Check for nontrivial bases (and recurse). 7772 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 7773 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 7774 assert(BaseRT && "Don't know how to handle dependent bases"); 7775 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 7776 if (!(BaseRecTy->*hasTrivial)()) { 7777 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 7778 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 7779 DiagnoseNontrivial(BaseRT, member); 7780 return; 7781 } 7782 } 7783 7784 // Check for nontrivial members (and recurse). 7785 typedef RecordDecl::field_iterator field_iter; 7786 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 7787 ++fi) { 7788 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 7789 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 7790 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 7791 7792 if (!(EltRD->*hasTrivial)()) { 7793 SourceLocation FLoc = (*fi)->getLocation(); 7794 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 7795 DiagnoseNontrivial(EltRT, member); 7796 return; 7797 } 7798 } 7799 } 7800 7801 assert(0 && "found no explanation for non-trivial member"); 7802} 7803 7804/// TranslateIvarVisibility - Translate visibility from a token ID to an 7805/// AST enum value. 7806static ObjCIvarDecl::AccessControl 7807TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 7808 switch (ivarVisibility) { 7809 default: assert(0 && "Unknown visitibility kind"); 7810 case tok::objc_private: return ObjCIvarDecl::Private; 7811 case tok::objc_public: return ObjCIvarDecl::Public; 7812 case tok::objc_protected: return ObjCIvarDecl::Protected; 7813 case tok::objc_package: return ObjCIvarDecl::Package; 7814 } 7815} 7816 7817/// ActOnIvar - Each ivar field of an objective-c class is passed into this 7818/// in order to create an IvarDecl object for it. 7819Decl *Sema::ActOnIvar(Scope *S, 7820 SourceLocation DeclStart, 7821 Decl *IntfDecl, 7822 Declarator &D, ExprTy *BitfieldWidth, 7823 tok::ObjCKeywordKind Visibility) { 7824 7825 IdentifierInfo *II = D.getIdentifier(); 7826 Expr *BitWidth = (Expr*)BitfieldWidth; 7827 SourceLocation Loc = DeclStart; 7828 if (II) Loc = D.getIdentifierLoc(); 7829 7830 // FIXME: Unnamed fields can be handled in various different ways, for 7831 // example, unnamed unions inject all members into the struct namespace! 7832 7833 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7834 QualType T = TInfo->getType(); 7835 7836 if (BitWidth) { 7837 // 6.7.2.1p3, 6.7.2.1p4 7838 if (VerifyBitField(Loc, II, T, BitWidth)) { 7839 D.setInvalidType(); 7840 BitWidth = 0; 7841 } 7842 } else { 7843 // Not a bitfield. 7844 7845 // validate II. 7846 7847 } 7848 if (T->isReferenceType()) { 7849 Diag(Loc, diag::err_ivar_reference_type); 7850 D.setInvalidType(); 7851 } 7852 // C99 6.7.2.1p8: A member of a structure or union may have any type other 7853 // than a variably modified type. 7854 else if (T->isVariablyModifiedType()) { 7855 Diag(Loc, diag::err_typecheck_ivar_variable_size); 7856 D.setInvalidType(); 7857 } 7858 7859 // Get the visibility (access control) for this ivar. 7860 ObjCIvarDecl::AccessControl ac = 7861 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 7862 : ObjCIvarDecl::None; 7863 // Must set ivar's DeclContext to its enclosing interface. 7864 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(IntfDecl); 7865 ObjCContainerDecl *EnclosingContext; 7866 if (ObjCImplementationDecl *IMPDecl = 7867 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 7868 if (!LangOpts.ObjCNonFragileABI2) { 7869 // Case of ivar declared in an implementation. Context is that of its class. 7870 EnclosingContext = IMPDecl->getClassInterface(); 7871 assert(EnclosingContext && "Implementation has no class interface!"); 7872 } 7873 else 7874 EnclosingContext = EnclosingDecl; 7875 } else { 7876 if (ObjCCategoryDecl *CDecl = 7877 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7878 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 7879 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 7880 return 0; 7881 } 7882 } 7883 EnclosingContext = EnclosingDecl; 7884 } 7885 7886 // Construct the decl. 7887 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 7888 DeclStart, Loc, II, T, 7889 TInfo, ac, (Expr *)BitfieldWidth); 7890 7891 if (II) { 7892 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 7893 ForRedeclaration); 7894 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 7895 && !isa<TagDecl>(PrevDecl)) { 7896 Diag(Loc, diag::err_duplicate_member) << II; 7897 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7898 NewID->setInvalidDecl(); 7899 } 7900 } 7901 7902 // Process attributes attached to the ivar. 7903 ProcessDeclAttributes(S, NewID, D); 7904 7905 if (D.isInvalidType()) 7906 NewID->setInvalidDecl(); 7907 7908 if (II) { 7909 // FIXME: When interfaces are DeclContexts, we'll need to add 7910 // these to the interface. 7911 S->AddDecl(NewID); 7912 IdResolver.AddDecl(NewID); 7913 } 7914 7915 return NewID; 7916} 7917 7918/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 7919/// class and class extensions. For every class @interface and class 7920/// extension @interface, if the last ivar is a bitfield of any type, 7921/// then add an implicit `char :0` ivar to the end of that interface. 7922void Sema::ActOnLastBitfield(SourceLocation DeclLoc, Decl *EnclosingDecl, 7923 llvm::SmallVectorImpl<Decl *> &AllIvarDecls) { 7924 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 7925 return; 7926 7927 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 7928 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 7929 7930 if (!Ivar->isBitField()) 7931 return; 7932 uint64_t BitFieldSize = 7933 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 7934 if (BitFieldSize == 0) 7935 return; 7936 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl); 7937 if (!ID) { 7938 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7939 if (!CD->IsClassExtension()) 7940 return; 7941 } 7942 // No need to add this to end of @implementation. 7943 else 7944 return; 7945 } 7946 // All conditions are met. Add a new bitfield to the tail end of ivars. 7947 llvm::APInt Zero(Context.getTypeSize(Context.CharTy), 0); 7948 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.CharTy, DeclLoc); 7949 7950 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(EnclosingDecl), 7951 DeclLoc, DeclLoc, 0, 7952 Context.CharTy, 7953 Context.CreateTypeSourceInfo(Context.CharTy), 7954 ObjCIvarDecl::Private, BW, 7955 true); 7956 AllIvarDecls.push_back(Ivar); 7957} 7958 7959void Sema::ActOnFields(Scope* S, 7960 SourceLocation RecLoc, Decl *EnclosingDecl, 7961 Decl **Fields, unsigned NumFields, 7962 SourceLocation LBrac, SourceLocation RBrac, 7963 AttributeList *Attr) { 7964 assert(EnclosingDecl && "missing record or interface decl"); 7965 7966 // If the decl this is being inserted into is invalid, then it may be a 7967 // redeclaration or some other bogus case. Don't try to add fields to it. 7968 if (EnclosingDecl->isInvalidDecl()) { 7969 // FIXME: Deallocate fields? 7970 return; 7971 } 7972 7973 7974 // Verify that all the fields are okay. 7975 unsigned NumNamedMembers = 0; 7976 llvm::SmallVector<FieldDecl*, 32> RecFields; 7977 7978 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 7979 for (unsigned i = 0; i != NumFields; ++i) { 7980 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 7981 7982 // Get the type for the field. 7983 const Type *FDTy = FD->getType().getTypePtr(); 7984 7985 if (!FD->isAnonymousStructOrUnion()) { 7986 // Remember all fields written by the user. 7987 RecFields.push_back(FD); 7988 } 7989 7990 // If the field is already invalid for some reason, don't emit more 7991 // diagnostics about it. 7992 if (FD->isInvalidDecl()) { 7993 EnclosingDecl->setInvalidDecl(); 7994 continue; 7995 } 7996 7997 // C99 6.7.2.1p2: 7998 // A structure or union shall not contain a member with 7999 // incomplete or function type (hence, a structure shall not 8000 // contain an instance of itself, but may contain a pointer to 8001 // an instance of itself), except that the last member of a 8002 // structure with more than one named member may have incomplete 8003 // array type; such a structure (and any union containing, 8004 // possibly recursively, a member that is such a structure) 8005 // shall not be a member of a structure or an element of an 8006 // array. 8007 if (FDTy->isFunctionType()) { 8008 // Field declared as a function. 8009 Diag(FD->getLocation(), diag::err_field_declared_as_function) 8010 << FD->getDeclName(); 8011 FD->setInvalidDecl(); 8012 EnclosingDecl->setInvalidDecl(); 8013 continue; 8014 } else if (FDTy->isIncompleteArrayType() && Record && 8015 ((i == NumFields - 1 && !Record->isUnion()) || 8016 ((getLangOptions().Microsoft || getLangOptions().CPlusPlus) && 8017 (i == NumFields - 1 || Record->isUnion())))) { 8018 // Flexible array member. 8019 // Microsoft and g++ is more permissive regarding flexible array. 8020 // It will accept flexible array in union and also 8021 // as the sole element of a struct/class. 8022 if (getLangOptions().Microsoft) { 8023 if (Record->isUnion()) 8024 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 8025 << FD->getDeclName(); 8026 else if (NumFields == 1) 8027 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 8028 << FD->getDeclName() << Record->getTagKind(); 8029 } else if (getLangOptions().CPlusPlus) { 8030 if (Record->isUnion()) 8031 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 8032 << FD->getDeclName(); 8033 else if (NumFields == 1) 8034 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 8035 << FD->getDeclName() << Record->getTagKind(); 8036 } else if (NumNamedMembers < 1) { 8037 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 8038 << FD->getDeclName(); 8039 FD->setInvalidDecl(); 8040 EnclosingDecl->setInvalidDecl(); 8041 continue; 8042 } 8043 if (!FD->getType()->isDependentType() && 8044 !Context.getBaseElementType(FD->getType())->isPODType()) { 8045 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 8046 << FD->getDeclName() << FD->getType(); 8047 FD->setInvalidDecl(); 8048 EnclosingDecl->setInvalidDecl(); 8049 continue; 8050 } 8051 // Okay, we have a legal flexible array member at the end of the struct. 8052 if (Record) 8053 Record->setHasFlexibleArrayMember(true); 8054 } else if (!FDTy->isDependentType() && 8055 RequireCompleteType(FD->getLocation(), FD->getType(), 8056 diag::err_field_incomplete)) { 8057 // Incomplete type 8058 FD->setInvalidDecl(); 8059 EnclosingDecl->setInvalidDecl(); 8060 continue; 8061 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 8062 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 8063 // If this is a member of a union, then entire union becomes "flexible". 8064 if (Record && Record->isUnion()) { 8065 Record->setHasFlexibleArrayMember(true); 8066 } else { 8067 // If this is a struct/class and this is not the last element, reject 8068 // it. Note that GCC supports variable sized arrays in the middle of 8069 // structures. 8070 if (i != NumFields-1) 8071 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 8072 << FD->getDeclName() << FD->getType(); 8073 else { 8074 // We support flexible arrays at the end of structs in 8075 // other structs as an extension. 8076 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 8077 << FD->getDeclName(); 8078 if (Record) 8079 Record->setHasFlexibleArrayMember(true); 8080 } 8081 } 8082 } 8083 if (Record && FDTTy->getDecl()->hasObjectMember()) 8084 Record->setHasObjectMember(true); 8085 } else if (FDTy->isObjCObjectType()) { 8086 /// A field cannot be an Objective-c object 8087 Diag(FD->getLocation(), diag::err_statically_allocated_object); 8088 FD->setInvalidDecl(); 8089 EnclosingDecl->setInvalidDecl(); 8090 continue; 8091 } else if (getLangOptions().ObjC1 && 8092 getLangOptions().getGCMode() != LangOptions::NonGC && 8093 Record && 8094 (FD->getType()->isObjCObjectPointerType() || 8095 FD->getType().isObjCGCStrong())) 8096 Record->setHasObjectMember(true); 8097 else if (Context.getAsArrayType(FD->getType())) { 8098 QualType BaseType = Context.getBaseElementType(FD->getType()); 8099 if (Record && BaseType->isRecordType() && 8100 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 8101 Record->setHasObjectMember(true); 8102 } 8103 // Keep track of the number of named members. 8104 if (FD->getIdentifier()) 8105 ++NumNamedMembers; 8106 } 8107 8108 // Okay, we successfully defined 'Record'. 8109 if (Record) { 8110 bool Completed = false; 8111 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 8112 if (!CXXRecord->isInvalidDecl()) { 8113 // Set access bits correctly on the directly-declared conversions. 8114 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 8115 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 8116 I != E; ++I) 8117 Convs->setAccess(I, (*I)->getAccess()); 8118 8119 if (!CXXRecord->isDependentType()) { 8120 // Add any implicitly-declared members to this class. 8121 AddImplicitlyDeclaredMembersToClass(CXXRecord); 8122 8123 // If we have virtual base classes, we may end up finding multiple 8124 // final overriders for a given virtual function. Check for this 8125 // problem now. 8126 if (CXXRecord->getNumVBases()) { 8127 CXXFinalOverriderMap FinalOverriders; 8128 CXXRecord->getFinalOverriders(FinalOverriders); 8129 8130 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 8131 MEnd = FinalOverriders.end(); 8132 M != MEnd; ++M) { 8133 for (OverridingMethods::iterator SO = M->second.begin(), 8134 SOEnd = M->second.end(); 8135 SO != SOEnd; ++SO) { 8136 assert(SO->second.size() > 0 && 8137 "Virtual function without overridding functions?"); 8138 if (SO->second.size() == 1) 8139 continue; 8140 8141 // C++ [class.virtual]p2: 8142 // In a derived class, if a virtual member function of a base 8143 // class subobject has more than one final overrider the 8144 // program is ill-formed. 8145 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 8146 << (NamedDecl *)M->first << Record; 8147 Diag(M->first->getLocation(), 8148 diag::note_overridden_virtual_function); 8149 for (OverridingMethods::overriding_iterator 8150 OM = SO->second.begin(), 8151 OMEnd = SO->second.end(); 8152 OM != OMEnd; ++OM) 8153 Diag(OM->Method->getLocation(), diag::note_final_overrider) 8154 << (NamedDecl *)M->first << OM->Method->getParent(); 8155 8156 Record->setInvalidDecl(); 8157 } 8158 } 8159 CXXRecord->completeDefinition(&FinalOverriders); 8160 Completed = true; 8161 } 8162 } 8163 } 8164 } 8165 8166 if (!Completed) 8167 Record->completeDefinition(); 8168 } else { 8169 ObjCIvarDecl **ClsFields = 8170 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 8171 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 8172 ID->setLocEnd(RBrac); 8173 // Add ivar's to class's DeclContext. 8174 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8175 ClsFields[i]->setLexicalDeclContext(ID); 8176 ID->addDecl(ClsFields[i]); 8177 } 8178 // Must enforce the rule that ivars in the base classes may not be 8179 // duplicates. 8180 if (ID->getSuperClass()) 8181 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 8182 } else if (ObjCImplementationDecl *IMPDecl = 8183 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8184 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 8185 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 8186 // Ivar declared in @implementation never belongs to the implementation. 8187 // Only it is in implementation's lexical context. 8188 ClsFields[I]->setLexicalDeclContext(IMPDecl); 8189 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 8190 } else if (ObjCCategoryDecl *CDecl = 8191 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8192 // case of ivars in class extension; all other cases have been 8193 // reported as errors elsewhere. 8194 // FIXME. Class extension does not have a LocEnd field. 8195 // CDecl->setLocEnd(RBrac); 8196 // Add ivar's to class extension's DeclContext. 8197 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8198 ClsFields[i]->setLexicalDeclContext(CDecl); 8199 CDecl->addDecl(ClsFields[i]); 8200 } 8201 } 8202 } 8203 8204 if (Attr) 8205 ProcessDeclAttributeList(S, Record, Attr); 8206 8207 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 8208 // set the visibility of this record. 8209 if (Record && !Record->getDeclContext()->isRecord()) 8210 AddPushedVisibilityAttribute(Record); 8211} 8212 8213/// \brief Determine whether the given integral value is representable within 8214/// the given type T. 8215static bool isRepresentableIntegerValue(ASTContext &Context, 8216 llvm::APSInt &Value, 8217 QualType T) { 8218 assert(T->isIntegralType(Context) && "Integral type required!"); 8219 unsigned BitWidth = Context.getIntWidth(T); 8220 8221 if (Value.isUnsigned() || Value.isNonNegative()) { 8222 if (T->isSignedIntegerType()) 8223 --BitWidth; 8224 return Value.getActiveBits() <= BitWidth; 8225 } 8226 return Value.getMinSignedBits() <= BitWidth; 8227} 8228 8229// \brief Given an integral type, return the next larger integral type 8230// (or a NULL type of no such type exists). 8231static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 8232 // FIXME: Int128/UInt128 support, which also needs to be introduced into 8233 // enum checking below. 8234 assert(T->isIntegralType(Context) && "Integral type required!"); 8235 const unsigned NumTypes = 4; 8236 QualType SignedIntegralTypes[NumTypes] = { 8237 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 8238 }; 8239 QualType UnsignedIntegralTypes[NumTypes] = { 8240 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 8241 Context.UnsignedLongLongTy 8242 }; 8243 8244 unsigned BitWidth = Context.getTypeSize(T); 8245 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 8246 : UnsignedIntegralTypes; 8247 for (unsigned I = 0; I != NumTypes; ++I) 8248 if (Context.getTypeSize(Types[I]) > BitWidth) 8249 return Types[I]; 8250 8251 return QualType(); 8252} 8253 8254EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 8255 EnumConstantDecl *LastEnumConst, 8256 SourceLocation IdLoc, 8257 IdentifierInfo *Id, 8258 Expr *Val) { 8259 unsigned IntWidth = Context.Target.getIntWidth(); 8260 llvm::APSInt EnumVal(IntWidth); 8261 QualType EltTy; 8262 8263 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 8264 Val = 0; 8265 8266 if (Val) { 8267 if (Enum->isDependentType() || Val->isTypeDependent()) 8268 EltTy = Context.DependentTy; 8269 else { 8270 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 8271 SourceLocation ExpLoc; 8272 if (!Val->isValueDependent() && 8273 VerifyIntegerConstantExpression(Val, &EnumVal)) { 8274 Val = 0; 8275 } else { 8276 if (!getLangOptions().CPlusPlus) { 8277 // C99 6.7.2.2p2: 8278 // The expression that defines the value of an enumeration constant 8279 // shall be an integer constant expression that has a value 8280 // representable as an int. 8281 8282 // Complain if the value is not representable in an int. 8283 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 8284 Diag(IdLoc, diag::ext_enum_value_not_int) 8285 << EnumVal.toString(10) << Val->getSourceRange() 8286 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 8287 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 8288 // Force the type of the expression to 'int'. 8289 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 8290 } 8291 } 8292 8293 if (Enum->isFixed()) { 8294 EltTy = Enum->getIntegerType(); 8295 8296 // C++0x [dcl.enum]p5: 8297 // ... if the initializing value of an enumerator cannot be 8298 // represented by the underlying type, the program is ill-formed. 8299 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 8300 if (getLangOptions().Microsoft) { 8301 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 8302 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8303 } else 8304 Diag(IdLoc, diag::err_enumerator_too_large) 8305 << EltTy; 8306 } else 8307 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8308 } 8309 else { 8310 // C++0x [dcl.enum]p5: 8311 // If the underlying type is not fixed, the type of each enumerator 8312 // is the type of its initializing value: 8313 // - If an initializer is specified for an enumerator, the 8314 // initializing value has the same type as the expression. 8315 EltTy = Val->getType(); 8316 } 8317 } 8318 } 8319 } 8320 8321 if (!Val) { 8322 if (Enum->isDependentType()) 8323 EltTy = Context.DependentTy; 8324 else if (!LastEnumConst) { 8325 // C++0x [dcl.enum]p5: 8326 // If the underlying type is not fixed, the type of each enumerator 8327 // is the type of its initializing value: 8328 // - If no initializer is specified for the first enumerator, the 8329 // initializing value has an unspecified integral type. 8330 // 8331 // GCC uses 'int' for its unspecified integral type, as does 8332 // C99 6.7.2.2p3. 8333 if (Enum->isFixed()) { 8334 EltTy = Enum->getIntegerType(); 8335 } 8336 else { 8337 EltTy = Context.IntTy; 8338 } 8339 } else { 8340 // Assign the last value + 1. 8341 EnumVal = LastEnumConst->getInitVal(); 8342 ++EnumVal; 8343 EltTy = LastEnumConst->getType(); 8344 8345 // Check for overflow on increment. 8346 if (EnumVal < LastEnumConst->getInitVal()) { 8347 // C++0x [dcl.enum]p5: 8348 // If the underlying type is not fixed, the type of each enumerator 8349 // is the type of its initializing value: 8350 // 8351 // - Otherwise the type of the initializing value is the same as 8352 // the type of the initializing value of the preceding enumerator 8353 // unless the incremented value is not representable in that type, 8354 // in which case the type is an unspecified integral type 8355 // sufficient to contain the incremented value. If no such type 8356 // exists, the program is ill-formed. 8357 QualType T = getNextLargerIntegralType(Context, EltTy); 8358 if (T.isNull() || Enum->isFixed()) { 8359 // There is no integral type larger enough to represent this 8360 // value. Complain, then allow the value to wrap around. 8361 EnumVal = LastEnumConst->getInitVal(); 8362 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 8363 ++EnumVal; 8364 if (Enum->isFixed()) 8365 // When the underlying type is fixed, this is ill-formed. 8366 Diag(IdLoc, diag::err_enumerator_wrapped) 8367 << EnumVal.toString(10) 8368 << EltTy; 8369 else 8370 Diag(IdLoc, diag::warn_enumerator_too_large) 8371 << EnumVal.toString(10); 8372 } else { 8373 EltTy = T; 8374 } 8375 8376 // Retrieve the last enumerator's value, extent that type to the 8377 // type that is supposed to be large enough to represent the incremented 8378 // value, then increment. 8379 EnumVal = LastEnumConst->getInitVal(); 8380 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 8381 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 8382 ++EnumVal; 8383 8384 // If we're not in C++, diagnose the overflow of enumerator values, 8385 // which in C99 means that the enumerator value is not representable in 8386 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 8387 // permits enumerator values that are representable in some larger 8388 // integral type. 8389 if (!getLangOptions().CPlusPlus && !T.isNull()) 8390 Diag(IdLoc, diag::warn_enum_value_overflow); 8391 } else if (!getLangOptions().CPlusPlus && 8392 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 8393 // Enforce C99 6.7.2.2p2 even when we compute the next value. 8394 Diag(IdLoc, diag::ext_enum_value_not_int) 8395 << EnumVal.toString(10) << 1; 8396 } 8397 } 8398 } 8399 8400 if (!EltTy->isDependentType()) { 8401 // Make the enumerator value match the signedness and size of the 8402 // enumerator's type. 8403 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 8404 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 8405 } 8406 8407 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 8408 Val, EnumVal); 8409} 8410 8411 8412Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 8413 SourceLocation IdLoc, IdentifierInfo *Id, 8414 AttributeList *Attr, 8415 SourceLocation EqualLoc, ExprTy *val) { 8416 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 8417 EnumConstantDecl *LastEnumConst = 8418 cast_or_null<EnumConstantDecl>(lastEnumConst); 8419 Expr *Val = static_cast<Expr*>(val); 8420 8421 // The scope passed in may not be a decl scope. Zip up the scope tree until 8422 // we find one that is. 8423 S = getNonFieldDeclScope(S); 8424 8425 // Verify that there isn't already something declared with this name in this 8426 // scope. 8427 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 8428 ForRedeclaration); 8429 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8430 // Maybe we will complain about the shadowed template parameter. 8431 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 8432 // Just pretend that we didn't see the previous declaration. 8433 PrevDecl = 0; 8434 } 8435 8436 if (PrevDecl) { 8437 // When in C++, we may get a TagDecl with the same name; in this case the 8438 // enum constant will 'hide' the tag. 8439 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 8440 "Received TagDecl when not in C++!"); 8441 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 8442 if (isa<EnumConstantDecl>(PrevDecl)) 8443 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 8444 else 8445 Diag(IdLoc, diag::err_redefinition) << Id; 8446 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8447 return 0; 8448 } 8449 } 8450 8451 // C++ [class.mem]p13: 8452 // If T is the name of a class, then each of the following shall have a 8453 // name different from T: 8454 // - every enumerator of every member of class T that is an enumerated 8455 // type 8456 if (CXXRecordDecl *Record 8457 = dyn_cast<CXXRecordDecl>( 8458 TheEnumDecl->getDeclContext()->getRedeclContext())) 8459 if (Record->getIdentifier() && Record->getIdentifier() == Id) 8460 Diag(IdLoc, diag::err_member_name_of_class) << Id; 8461 8462 EnumConstantDecl *New = 8463 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 8464 8465 if (New) { 8466 // Process attributes. 8467 if (Attr) ProcessDeclAttributeList(S, New, Attr); 8468 8469 // Register this decl in the current scope stack. 8470 New->setAccess(TheEnumDecl->getAccess()); 8471 PushOnScopeChains(New, S); 8472 } 8473 8474 return New; 8475} 8476 8477void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 8478 SourceLocation RBraceLoc, Decl *EnumDeclX, 8479 Decl **Elements, unsigned NumElements, 8480 Scope *S, AttributeList *Attr) { 8481 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 8482 QualType EnumType = Context.getTypeDeclType(Enum); 8483 8484 if (Attr) 8485 ProcessDeclAttributeList(S, Enum, Attr); 8486 8487 if (Enum->isDependentType()) { 8488 for (unsigned i = 0; i != NumElements; ++i) { 8489 EnumConstantDecl *ECD = 8490 cast_or_null<EnumConstantDecl>(Elements[i]); 8491 if (!ECD) continue; 8492 8493 ECD->setType(EnumType); 8494 } 8495 8496 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 8497 return; 8498 } 8499 8500 // TODO: If the result value doesn't fit in an int, it must be a long or long 8501 // long value. ISO C does not support this, but GCC does as an extension, 8502 // emit a warning. 8503 unsigned IntWidth = Context.Target.getIntWidth(); 8504 unsigned CharWidth = Context.Target.getCharWidth(); 8505 unsigned ShortWidth = Context.Target.getShortWidth(); 8506 8507 // Verify that all the values are okay, compute the size of the values, and 8508 // reverse the list. 8509 unsigned NumNegativeBits = 0; 8510 unsigned NumPositiveBits = 0; 8511 8512 // Keep track of whether all elements have type int. 8513 bool AllElementsInt = true; 8514 8515 for (unsigned i = 0; i != NumElements; ++i) { 8516 EnumConstantDecl *ECD = 8517 cast_or_null<EnumConstantDecl>(Elements[i]); 8518 if (!ECD) continue; // Already issued a diagnostic. 8519 8520 const llvm::APSInt &InitVal = ECD->getInitVal(); 8521 8522 // Keep track of the size of positive and negative values. 8523 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 8524 NumPositiveBits = std::max(NumPositiveBits, 8525 (unsigned)InitVal.getActiveBits()); 8526 else 8527 NumNegativeBits = std::max(NumNegativeBits, 8528 (unsigned)InitVal.getMinSignedBits()); 8529 8530 // Keep track of whether every enum element has type int (very commmon). 8531 if (AllElementsInt) 8532 AllElementsInt = ECD->getType() == Context.IntTy; 8533 } 8534 8535 // Figure out the type that should be used for this enum. 8536 QualType BestType; 8537 unsigned BestWidth; 8538 8539 // C++0x N3000 [conv.prom]p3: 8540 // An rvalue of an unscoped enumeration type whose underlying 8541 // type is not fixed can be converted to an rvalue of the first 8542 // of the following types that can represent all the values of 8543 // the enumeration: int, unsigned int, long int, unsigned long 8544 // int, long long int, or unsigned long long int. 8545 // C99 6.4.4.3p2: 8546 // An identifier declared as an enumeration constant has type int. 8547 // The C99 rule is modified by a gcc extension 8548 QualType BestPromotionType; 8549 8550 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 8551 // -fshort-enums is the equivalent to specifying the packed attribute on all 8552 // enum definitions. 8553 if (LangOpts.ShortEnums) 8554 Packed = true; 8555 8556 if (Enum->isFixed()) { 8557 BestType = BestPromotionType = Enum->getIntegerType(); 8558 // We don't need to set BestWidth, because BestType is going to be the type 8559 // of the enumerators, but we do anyway because otherwise some compilers 8560 // warn that it might be used uninitialized. 8561 BestWidth = CharWidth; 8562 } 8563 else if (NumNegativeBits) { 8564 // If there is a negative value, figure out the smallest integer type (of 8565 // int/long/longlong) that fits. 8566 // If it's packed, check also if it fits a char or a short. 8567 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 8568 BestType = Context.SignedCharTy; 8569 BestWidth = CharWidth; 8570 } else if (Packed && NumNegativeBits <= ShortWidth && 8571 NumPositiveBits < ShortWidth) { 8572 BestType = Context.ShortTy; 8573 BestWidth = ShortWidth; 8574 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 8575 BestType = Context.IntTy; 8576 BestWidth = IntWidth; 8577 } else { 8578 BestWidth = Context.Target.getLongWidth(); 8579 8580 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 8581 BestType = Context.LongTy; 8582 } else { 8583 BestWidth = Context.Target.getLongLongWidth(); 8584 8585 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 8586 Diag(Enum->getLocation(), diag::warn_enum_too_large); 8587 BestType = Context.LongLongTy; 8588 } 8589 } 8590 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 8591 } else { 8592 // If there is no negative value, figure out the smallest type that fits 8593 // all of the enumerator values. 8594 // If it's packed, check also if it fits a char or a short. 8595 if (Packed && NumPositiveBits <= CharWidth) { 8596 BestType = Context.UnsignedCharTy; 8597 BestPromotionType = Context.IntTy; 8598 BestWidth = CharWidth; 8599 } else if (Packed && NumPositiveBits <= ShortWidth) { 8600 BestType = Context.UnsignedShortTy; 8601 BestPromotionType = Context.IntTy; 8602 BestWidth = ShortWidth; 8603 } else if (NumPositiveBits <= IntWidth) { 8604 BestType = Context.UnsignedIntTy; 8605 BestWidth = IntWidth; 8606 BestPromotionType 8607 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 8608 ? Context.UnsignedIntTy : Context.IntTy; 8609 } else if (NumPositiveBits <= 8610 (BestWidth = Context.Target.getLongWidth())) { 8611 BestType = Context.UnsignedLongTy; 8612 BestPromotionType 8613 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 8614 ? Context.UnsignedLongTy : Context.LongTy; 8615 } else { 8616 BestWidth = Context.Target.getLongLongWidth(); 8617 assert(NumPositiveBits <= BestWidth && 8618 "How could an initializer get larger than ULL?"); 8619 BestType = Context.UnsignedLongLongTy; 8620 BestPromotionType 8621 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 8622 ? Context.UnsignedLongLongTy : Context.LongLongTy; 8623 } 8624 } 8625 8626 // Loop over all of the enumerator constants, changing their types to match 8627 // the type of the enum if needed. 8628 for (unsigned i = 0; i != NumElements; ++i) { 8629 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 8630 if (!ECD) continue; // Already issued a diagnostic. 8631 8632 // Standard C says the enumerators have int type, but we allow, as an 8633 // extension, the enumerators to be larger than int size. If each 8634 // enumerator value fits in an int, type it as an int, otherwise type it the 8635 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 8636 // that X has type 'int', not 'unsigned'. 8637 8638 // Determine whether the value fits into an int. 8639 llvm::APSInt InitVal = ECD->getInitVal(); 8640 8641 // If it fits into an integer type, force it. Otherwise force it to match 8642 // the enum decl type. 8643 QualType NewTy; 8644 unsigned NewWidth; 8645 bool NewSign; 8646 if (!getLangOptions().CPlusPlus && 8647 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 8648 NewTy = Context.IntTy; 8649 NewWidth = IntWidth; 8650 NewSign = true; 8651 } else if (ECD->getType() == BestType) { 8652 // Already the right type! 8653 if (getLangOptions().CPlusPlus) 8654 // C++ [dcl.enum]p4: Following the closing brace of an 8655 // enum-specifier, each enumerator has the type of its 8656 // enumeration. 8657 ECD->setType(EnumType); 8658 continue; 8659 } else { 8660 NewTy = BestType; 8661 NewWidth = BestWidth; 8662 NewSign = BestType->isSignedIntegerType(); 8663 } 8664 8665 // Adjust the APSInt value. 8666 InitVal = InitVal.extOrTrunc(NewWidth); 8667 InitVal.setIsSigned(NewSign); 8668 ECD->setInitVal(InitVal); 8669 8670 // Adjust the Expr initializer and type. 8671 if (ECD->getInitExpr() && 8672 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 8673 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 8674 CK_IntegralCast, 8675 ECD->getInitExpr(), 8676 /*base paths*/ 0, 8677 VK_RValue)); 8678 if (getLangOptions().CPlusPlus) 8679 // C++ [dcl.enum]p4: Following the closing brace of an 8680 // enum-specifier, each enumerator has the type of its 8681 // enumeration. 8682 ECD->setType(EnumType); 8683 else 8684 ECD->setType(NewTy); 8685 } 8686 8687 Enum->completeDefinition(BestType, BestPromotionType, 8688 NumPositiveBits, NumNegativeBits); 8689} 8690 8691Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 8692 SourceLocation StartLoc, 8693 SourceLocation EndLoc) { 8694 StringLiteral *AsmString = cast<StringLiteral>(expr); 8695 8696 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 8697 AsmString, StartLoc, 8698 EndLoc); 8699 CurContext->addDecl(New); 8700 return New; 8701} 8702 8703void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 8704 SourceLocation PragmaLoc, 8705 SourceLocation NameLoc) { 8706 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 8707 8708 if (PrevDecl) { 8709 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 8710 } else { 8711 (void)WeakUndeclaredIdentifiers.insert( 8712 std::pair<IdentifierInfo*,WeakInfo> 8713 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 8714 } 8715} 8716 8717void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 8718 IdentifierInfo* AliasName, 8719 SourceLocation PragmaLoc, 8720 SourceLocation NameLoc, 8721 SourceLocation AliasNameLoc) { 8722 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 8723 LookupOrdinaryName); 8724 WeakInfo W = WeakInfo(Name, NameLoc); 8725 8726 if (PrevDecl) { 8727 if (!PrevDecl->hasAttr<AliasAttr>()) 8728 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 8729 DeclApplyPragmaWeak(TUScope, ND, W); 8730 } else { 8731 (void)WeakUndeclaredIdentifiers.insert( 8732 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 8733 } 8734} 8735