SemaDecl.cpp revision f7ed78151d1ca4cf63198b4987bff9bcd650cb40
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 "Sema.h" 15#include "SemaInherit.h" 16#include "clang/AST/APValue.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/DeclObjC.h" 20#include "clang/AST/DeclTemplate.h" 21#include "clang/AST/ExprCXX.h" 22#include "clang/AST/StmtCXX.h" 23#include "clang/Parse/DeclSpec.h" 24#include "clang/Basic/TargetInfo.h" 25#include "clang/Basic/SourceManager.h" 26// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 27#include "clang/Lex/Preprocessor.h" 28#include "clang/Lex/HeaderSearch.h" 29#include "llvm/ADT/SmallSet.h" 30#include "llvm/ADT/STLExtras.h" 31#include <algorithm> 32#include <functional> 33using namespace clang; 34 35/// getDeclName - Return a pretty name for the specified decl if possible, or 36/// an empty string if not. This is used for pretty crash reporting. 37std::string Sema::getDeclName(DeclPtrTy d) { 38 Decl *D = d.getAs<Decl>(); 39 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 40 return DN->getQualifiedNameAsString(); 41 return ""; 42} 43 44Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) { 45 return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>())); 46} 47 48/// \brief If the identifier refers to a type name within this scope, 49/// return the declaration of that type. 50/// 51/// This routine performs ordinary name lookup of the identifier II 52/// within the given scope, with optional C++ scope specifier SS, to 53/// determine whether the name refers to a type. If so, returns an 54/// opaque pointer (actually a QualType) corresponding to that 55/// type. Otherwise, returns NULL. 56/// 57/// If name lookup results in an ambiguity, this routine will complain 58/// and then return NULL. 59Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 60 Scope *S, const CXXScopeSpec *SS) { 61 // C++ [temp.res]p3: 62 // A qualified-id that refers to a type and in which the 63 // nested-name-specifier depends on a template-parameter (14.6.2) 64 // shall be prefixed by the keyword typename to indicate that the 65 // qualified-id denotes a type, forming an 66 // elaborated-type-specifier (7.1.5.3). 67 // 68 // We therefore do not perform any name lookup if the result would 69 // refer to a member of an unknown specialization. 70 if (SS && isUnknownSpecialization(*SS)) 71 return 0; 72 73 LookupResult Result 74 = LookupParsedName(S, SS, &II, LookupOrdinaryName, false, false); 75 76 NamedDecl *IIDecl = 0; 77 switch (Result.getKind()) { 78 case LookupResult::NotFound: 79 case LookupResult::FoundOverloaded: 80 return 0; 81 82 case LookupResult::AmbiguousBaseSubobjectTypes: 83 case LookupResult::AmbiguousBaseSubobjects: 84 case LookupResult::AmbiguousReference: { 85 // Look to see if we have a type anywhere in the list of results. 86 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 87 Res != ResEnd; ++Res) { 88 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 89 if (!IIDecl || 90 (*Res)->getLocation().getRawEncoding() < 91 IIDecl->getLocation().getRawEncoding()) 92 IIDecl = *Res; 93 } 94 } 95 96 if (!IIDecl) { 97 // None of the entities we found is a type, so there is no way 98 // to even assume that the result is a type. In this case, don't 99 // complain about the ambiguity. The parser will either try to 100 // perform this lookup again (e.g., as an object name), which 101 // will produce the ambiguity, or will complain that it expected 102 // a type name. 103 Result.Destroy(); 104 return 0; 105 } 106 107 // We found a type within the ambiguous lookup; diagnose the 108 // ambiguity and then return that type. This might be the right 109 // answer, or it might not be, but it suppresses any attempt to 110 // perform the name lookup again. 111 DiagnoseAmbiguousLookup(Result, DeclarationName(&II), NameLoc); 112 break; 113 } 114 115 case LookupResult::Found: 116 IIDecl = Result.getAsDecl(); 117 break; 118 } 119 120 if (IIDecl) { 121 QualType T; 122 123 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 124 // Check whether we can use this type 125 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 126 127 if (getLangOptions().CPlusPlus) { 128 // C++ [temp.local]p2: 129 // Within the scope of a class template specialization or 130 // partial specialization, when the injected-class-name is 131 // not followed by a <, it is equivalent to the 132 // injected-class-name followed by the template-argument s 133 // of the class template specialization or partial 134 // specialization enclosed in <>. 135 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) 136 if (RD->isInjectedClassName()) 137 if (ClassTemplateDecl *Template = RD->getDescribedClassTemplate()) 138 T = Template->getInjectedClassNameType(Context); 139 } 140 141 if (T.isNull()) 142 T = Context.getTypeDeclType(TD); 143 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 144 // Check whether we can use this interface. 145 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 146 147 T = Context.getObjCInterfaceType(IDecl); 148 } else 149 return 0; 150 151 if (SS) 152 T = getQualifiedNameType(*SS, T); 153 154 return T.getAsOpaquePtr(); 155 } 156 157 return 0; 158} 159 160/// isTagName() - This method is called *for error recovery purposes only* 161/// to determine if the specified name is a valid tag name ("struct foo"). If 162/// so, this returns the TST for the tag corresponding to it (TST_enum, 163/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 164/// where the user forgot to specify the tag. 165DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 166 // Do a tag name lookup in this scope. 167 LookupResult R = LookupName(S, &II, LookupTagName, false, false); 168 if (R.getKind() == LookupResult::Found) 169 if (const TagDecl *TD = dyn_cast<TagDecl>(R.getAsDecl())) { 170 switch (TD->getTagKind()) { 171 case TagDecl::TK_struct: return DeclSpec::TST_struct; 172 case TagDecl::TK_union: return DeclSpec::TST_union; 173 case TagDecl::TK_class: return DeclSpec::TST_class; 174 case TagDecl::TK_enum: return DeclSpec::TST_enum; 175 } 176 } 177 178 return DeclSpec::TST_unspecified; 179} 180 181 182 183DeclContext *Sema::getContainingDC(DeclContext *DC) { 184 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) { 185 // A C++ out-of-line method will return to the file declaration context. 186 if (MD->isOutOfLineDefinition()) 187 return MD->getLexicalDeclContext(); 188 189 // A C++ inline method is parsed *after* the topmost class it was declared 190 // in is fully parsed (it's "complete"). 191 // The parsing of a C++ inline method happens at the declaration context of 192 // the topmost (non-nested) class it is lexically declared in. 193 assert(isa<CXXRecordDecl>(MD->getParent()) && "C++ method not in Record."); 194 DC = MD->getParent(); 195 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 196 DC = RD; 197 198 // Return the declaration context of the topmost class the inline method is 199 // declared in. 200 return DC; 201 } 202 203 if (isa<ObjCMethodDecl>(DC)) 204 return Context.getTranslationUnitDecl(); 205 206 return DC->getLexicalParent(); 207} 208 209void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 210 assert(getContainingDC(DC) == CurContext && 211 "The next DeclContext should be lexically contained in the current one."); 212 CurContext = DC; 213 S->setEntity(DC); 214} 215 216void Sema::PopDeclContext() { 217 assert(CurContext && "DeclContext imbalance!"); 218 219 CurContext = getContainingDC(CurContext); 220} 221 222/// \brief Determine whether we allow overloading of the function 223/// PrevDecl with another declaration. 224/// 225/// This routine determines whether overloading is possible, not 226/// whether some new function is actually an overload. It will return 227/// true in C++ (where we can always provide overloads) or, as an 228/// extension, in C when the previous function is already an 229/// overloaded function declaration or has the "overloadable" 230/// attribute. 231static bool AllowOverloadingOfFunction(Decl *PrevDecl, ASTContext &Context) { 232 if (Context.getLangOptions().CPlusPlus) 233 return true; 234 235 if (isa<OverloadedFunctionDecl>(PrevDecl)) 236 return true; 237 238 return PrevDecl->getAttr<OverloadableAttr>() != 0; 239} 240 241/// Add this decl to the scope shadowed decl chains. 242void Sema::PushOnScopeChains(NamedDecl *D, Scope *S) { 243 // Move up the scope chain until we find the nearest enclosing 244 // non-transparent context. The declaration will be introduced into this 245 // scope. 246 while (S->getEntity() && 247 ((DeclContext *)S->getEntity())->isTransparentContext()) 248 S = S->getParent(); 249 250 S->AddDecl(DeclPtrTy::make(D)); 251 252 // Add scoped declarations into their context, so that they can be 253 // found later. Declarations without a context won't be inserted 254 // into any context. 255 CurContext->addDecl(Context, D); 256 257 // C++ [basic.scope]p4: 258 // -- exactly one declaration shall declare a class name or 259 // enumeration name that is not a typedef name and the other 260 // declarations shall all refer to the same object or 261 // enumerator, or all refer to functions and function templates; 262 // in this case the class name or enumeration name is hidden. 263 if (TagDecl *TD = dyn_cast<TagDecl>(D)) { 264 // We are pushing the name of a tag (enum or class). 265 if (CurContext->getLookupContext() 266 == TD->getDeclContext()->getLookupContext()) { 267 // We're pushing the tag into the current context, which might 268 // require some reshuffling in the identifier resolver. 269 IdentifierResolver::iterator 270 I = IdResolver.begin(TD->getDeclName()), 271 IEnd = IdResolver.end(); 272 if (I != IEnd && isDeclInScope(*I, CurContext, S)) { 273 NamedDecl *PrevDecl = *I; 274 for (; I != IEnd && isDeclInScope(*I, CurContext, S); 275 PrevDecl = *I, ++I) { 276 if (TD->declarationReplaces(*I)) { 277 // This is a redeclaration. Remove it from the chain and 278 // break out, so that we'll add in the shadowed 279 // declaration. 280 S->RemoveDecl(DeclPtrTy::make(*I)); 281 if (PrevDecl == *I) { 282 IdResolver.RemoveDecl(*I); 283 IdResolver.AddDecl(TD); 284 return; 285 } else { 286 IdResolver.RemoveDecl(*I); 287 break; 288 } 289 } 290 } 291 292 // There is already a declaration with the same name in the same 293 // scope, which is not a tag declaration. It must be found 294 // before we find the new declaration, so insert the new 295 // declaration at the end of the chain. 296 IdResolver.AddShadowedDecl(TD, PrevDecl); 297 298 return; 299 } 300 } 301 } else if (isa<FunctionDecl>(D) && 302 AllowOverloadingOfFunction(D, Context)) { 303 // We are pushing the name of a function, which might be an 304 // overloaded name. 305 FunctionDecl *FD = cast<FunctionDecl>(D); 306 IdentifierResolver::iterator Redecl 307 = std::find_if(IdResolver.begin(FD->getDeclName()), 308 IdResolver.end(), 309 std::bind1st(std::mem_fun(&NamedDecl::declarationReplaces), 310 FD)); 311 if (Redecl != IdResolver.end() && 312 S->isDeclScope(DeclPtrTy::make(*Redecl))) { 313 // There is already a declaration of a function on our 314 // IdResolver chain. Replace it with this declaration. 315 S->RemoveDecl(DeclPtrTy::make(*Redecl)); 316 IdResolver.RemoveDecl(*Redecl); 317 } 318 } else if (isa<ObjCInterfaceDecl>(D)) { 319 // We're pushing an Objective-C interface into the current 320 // context. If there is already an alias declaration, remove it first. 321 for (IdentifierResolver::iterator 322 I = IdResolver.begin(D->getDeclName()), IEnd = IdResolver.end(); 323 I != IEnd; ++I) { 324 if (isa<ObjCCompatibleAliasDecl>(*I)) { 325 S->RemoveDecl(DeclPtrTy::make(*I)); 326 IdResolver.RemoveDecl(*I); 327 break; 328 } 329 } 330 } 331 332 IdResolver.AddDecl(D); 333} 334 335void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 336 if (S->decl_empty()) return; 337 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 338 "Scope shouldn't contain decls!"); 339 340 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 341 I != E; ++I) { 342 Decl *TmpD = (*I).getAs<Decl>(); 343 assert(TmpD && "This decl didn't get pushed??"); 344 345 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 346 NamedDecl *D = cast<NamedDecl>(TmpD); 347 348 if (!D->getDeclName()) continue; 349 350 // Remove this name from our lexical scope. 351 IdResolver.RemoveDecl(D); 352 } 353} 354 355/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 356/// return 0 if one not found. 357ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 358 // The third "scope" argument is 0 since we aren't enabling lazy built-in 359 // creation from this context. 360 NamedDecl *IDecl = LookupName(TUScope, Id, LookupOrdinaryName); 361 362 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 363} 364 365/// getNonFieldDeclScope - Retrieves the innermost scope, starting 366/// from S, where a non-field would be declared. This routine copes 367/// with the difference between C and C++ scoping rules in structs and 368/// unions. For example, the following code is well-formed in C but 369/// ill-formed in C++: 370/// @code 371/// struct S6 { 372/// enum { BAR } e; 373/// }; 374/// 375/// void test_S6() { 376/// struct S6 a; 377/// a.e = BAR; 378/// } 379/// @endcode 380/// For the declaration of BAR, this routine will return a different 381/// scope. The scope S will be the scope of the unnamed enumeration 382/// within S6. In C++, this routine will return the scope associated 383/// with S6, because the enumeration's scope is a transparent 384/// context but structures can contain non-field names. In C, this 385/// routine will return the translation unit scope, since the 386/// enumeration's scope is a transparent context and structures cannot 387/// contain non-field names. 388Scope *Sema::getNonFieldDeclScope(Scope *S) { 389 while (((S->getFlags() & Scope::DeclScope) == 0) || 390 (S->getEntity() && 391 ((DeclContext *)S->getEntity())->isTransparentContext()) || 392 (S->isClassScope() && !getLangOptions().CPlusPlus)) 393 S = S->getParent(); 394 return S; 395} 396 397void Sema::InitBuiltinVaListType() { 398 if (!Context.getBuiltinVaListType().isNull()) 399 return; 400 401 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 402 NamedDecl *VaDecl = LookupName(TUScope, VaIdent, LookupOrdinaryName); 403 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 404 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 405} 406 407/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 408/// file scope. lazily create a decl for it. ForRedeclaration is true 409/// if we're creating this built-in in anticipation of redeclaring the 410/// built-in. 411NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 412 Scope *S, bool ForRedeclaration, 413 SourceLocation Loc) { 414 Builtin::ID BID = (Builtin::ID)bid; 415 416 if (Context.BuiltinInfo.hasVAListUse(BID)) 417 InitBuiltinVaListType(); 418 419 Builtin::Context::GetBuiltinTypeError Error; 420 QualType R = Context.BuiltinInfo.GetBuiltinType(BID, Context, Error); 421 switch (Error) { 422 case Builtin::Context::GE_None: 423 // Okay 424 break; 425 426 case Builtin::Context::GE_Missing_FILE: 427 if (ForRedeclaration) 428 Diag(Loc, diag::err_implicit_decl_requires_stdio) 429 << Context.BuiltinInfo.GetName(BID); 430 return 0; 431 } 432 433 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 434 Diag(Loc, diag::ext_implicit_lib_function_decl) 435 << Context.BuiltinInfo.GetName(BID) 436 << R; 437 if (Context.BuiltinInfo.getHeaderName(BID) && 438 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 439 != Diagnostic::Ignored) 440 Diag(Loc, diag::note_please_include_header) 441 << Context.BuiltinInfo.getHeaderName(BID) 442 << Context.BuiltinInfo.GetName(BID); 443 } 444 445 FunctionDecl *New = FunctionDecl::Create(Context, 446 Context.getTranslationUnitDecl(), 447 Loc, II, R, 448 FunctionDecl::Extern, false, 449 /*hasPrototype=*/true); 450 New->setImplicit(); 451 452 // Create Decl objects for each parameter, adding them to the 453 // FunctionDecl. 454 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 455 llvm::SmallVector<ParmVarDecl*, 16> Params; 456 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 457 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 458 FT->getArgType(i), VarDecl::None, 0)); 459 New->setParams(Context, Params.data(), Params.size()); 460 } 461 462 AddKnownFunctionAttributes(New); 463 464 // TUScope is the translation-unit scope to insert this function into. 465 // FIXME: This is hideous. We need to teach PushOnScopeChains to 466 // relate Scopes to DeclContexts, and probably eliminate CurContext 467 // entirely, but we're not there yet. 468 DeclContext *SavedContext = CurContext; 469 CurContext = Context.getTranslationUnitDecl(); 470 PushOnScopeChains(New, TUScope); 471 CurContext = SavedContext; 472 return New; 473} 474 475/// GetStdNamespace - This method gets the C++ "std" namespace. This is where 476/// everything from the standard library is defined. 477NamespaceDecl *Sema::GetStdNamespace() { 478 if (!StdNamespace) { 479 IdentifierInfo *StdIdent = &PP.getIdentifierTable().get("std"); 480 DeclContext *Global = Context.getTranslationUnitDecl(); 481 Decl *Std = LookupQualifiedName(Global, StdIdent, LookupNamespaceName); 482 StdNamespace = dyn_cast_or_null<NamespaceDecl>(Std); 483 } 484 return StdNamespace; 485} 486 487/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 488/// same name and scope as a previous declaration 'Old'. Figure out 489/// how to resolve this situation, merging decls or emitting 490/// diagnostics as appropriate. If there was an error, set New to be invalid. 491/// 492void Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 493 // If either decl is known invalid already, set the new one to be invalid and 494 // don't bother doing any merging checks. 495 if (New->isInvalidDecl() || OldD->isInvalidDecl()) 496 return New->setInvalidDecl(); 497 498 bool objc_types = false; 499 500 // Allow multiple definitions for ObjC built-in typedefs. 501 // FIXME: Verify the underlying types are equivalent! 502 if (getLangOptions().ObjC1) { 503 const IdentifierInfo *TypeID = New->getIdentifier(); 504 switch (TypeID->getLength()) { 505 default: break; 506 case 2: 507 if (!TypeID->isStr("id")) 508 break; 509 Context.setObjCIdType(Context.getTypeDeclType(New)); 510 objc_types = true; 511 break; 512 case 5: 513 if (!TypeID->isStr("Class")) 514 break; 515 Context.setObjCClassType(Context.getTypeDeclType(New)); 516 return; 517 case 3: 518 if (!TypeID->isStr("SEL")) 519 break; 520 Context.setObjCSelType(Context.getTypeDeclType(New)); 521 return; 522 case 8: 523 if (!TypeID->isStr("Protocol")) 524 break; 525 Context.setObjCProtoType(New->getUnderlyingType()); 526 return; 527 } 528 // Fall through - the typedef name was not a builtin type. 529 } 530 // Verify the old decl was also a type. 531 TypeDecl *Old = dyn_cast<TypeDecl>(OldD); 532 if (!Old) { 533 Diag(New->getLocation(), diag::err_redefinition_different_kind) 534 << New->getDeclName(); 535 if (OldD->getLocation().isValid()) 536 Diag(OldD->getLocation(), diag::note_previous_definition); 537 return New->setInvalidDecl(); 538 } 539 540 // Determine the "old" type we'll use for checking and diagnostics. 541 QualType OldType; 542 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 543 OldType = OldTypedef->getUnderlyingType(); 544 else 545 OldType = Context.getTypeDeclType(Old); 546 547 // If the typedef types are not identical, reject them in all languages and 548 // with any extensions enabled. 549 550 if (OldType != New->getUnderlyingType() && 551 Context.getCanonicalType(OldType) != 552 Context.getCanonicalType(New->getUnderlyingType())) { 553 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 554 << New->getUnderlyingType() << OldType; 555 if (Old->getLocation().isValid()) 556 Diag(Old->getLocation(), diag::note_previous_definition); 557 return New->setInvalidDecl(); 558 } 559 560 if (objc_types || getLangOptions().Microsoft) 561 return; 562 563 // C++ [dcl.typedef]p2: 564 // In a given non-class scope, a typedef specifier can be used to 565 // redefine the name of any type declared in that scope to refer 566 // to the type to which it already refers. 567 if (getLangOptions().CPlusPlus) { 568 if (!isa<CXXRecordDecl>(CurContext)) 569 return; 570 Diag(New->getLocation(), diag::err_redefinition) 571 << New->getDeclName(); 572 Diag(Old->getLocation(), diag::note_previous_definition); 573 return New->setInvalidDecl(); 574 } 575 576 // If we have a redefinition of a typedef in C, emit a warning. This warning 577 // is normally mapped to an error, but can be controlled with 578 // -Wtypedef-redefinition. If either the original was in a system header, 579 // don't emit this for compatibility with GCC. 580 if (PP.getDiagnostics().getSuppressSystemWarnings() && 581 Context.getSourceManager().isInSystemHeader(Old->getLocation())) 582 return; 583 584 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 585 << New->getDeclName(); 586 Diag(Old->getLocation(), diag::note_previous_definition); 587 return; 588} 589 590/// DeclhasAttr - returns true if decl Declaration already has the target 591/// attribute. 592static bool DeclHasAttr(const Decl *decl, const Attr *target) { 593 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 594 if (attr->getKind() == target->getKind()) 595 return true; 596 597 return false; 598} 599 600/// MergeAttributes - append attributes from the Old decl to the New one. 601static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 602 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 603 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 604 Attr *NewAttr = attr->clone(C); 605 NewAttr->setInherited(true); 606 New->addAttr(NewAttr); 607 } 608 } 609} 610 611/// Used in MergeFunctionDecl to keep track of function parameters in 612/// C. 613struct GNUCompatibleParamWarning { 614 ParmVarDecl *OldParm; 615 ParmVarDecl *NewParm; 616 QualType PromotedType; 617}; 618 619/// MergeFunctionDecl - We just parsed a function 'New' from 620/// declarator D which has the same name and scope as a previous 621/// declaration 'Old'. Figure out how to resolve this situation, 622/// merging decls or emitting diagnostics as appropriate. 623/// 624/// In C++, New and Old must be declarations that are not 625/// overloaded. Use IsOverload to determine whether New and Old are 626/// overloaded, and to select the Old declaration that New should be 627/// merged with. 628/// 629/// Returns true if there was an error, false otherwise. 630bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 631 assert(!isa<OverloadedFunctionDecl>(OldD) && 632 "Cannot merge with an overloaded function declaration"); 633 634 // Verify the old decl was also a function. 635 FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); 636 if (!Old) { 637 Diag(New->getLocation(), diag::err_redefinition_different_kind) 638 << New->getDeclName(); 639 Diag(OldD->getLocation(), diag::note_previous_definition); 640 return true; 641 } 642 643 // Determine whether the previous declaration was a definition, 644 // implicit declaration, or a declaration. 645 diag::kind PrevDiag; 646 if (Old->isThisDeclarationADefinition()) 647 PrevDiag = diag::note_previous_definition; 648 else if (Old->isImplicit()) 649 PrevDiag = diag::note_previous_implicit_declaration; 650 else 651 PrevDiag = diag::note_previous_declaration; 652 653 QualType OldQType = Context.getCanonicalType(Old->getType()); 654 QualType NewQType = Context.getCanonicalType(New->getType()); 655 656 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 657 New->getStorageClass() == FunctionDecl::Static && 658 Old->getStorageClass() != FunctionDecl::Static) { 659 Diag(New->getLocation(), diag::err_static_non_static) 660 << New; 661 Diag(Old->getLocation(), PrevDiag); 662 return true; 663 } 664 665 if (getLangOptions().CPlusPlus) { 666 // (C++98 13.1p2): 667 // Certain function declarations cannot be overloaded: 668 // -- Function declarations that differ only in the return type 669 // cannot be overloaded. 670 QualType OldReturnType 671 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 672 QualType NewReturnType 673 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 674 if (OldReturnType != NewReturnType) { 675 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 676 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 677 return true; 678 } 679 680 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 681 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 682 if (OldMethod && NewMethod && 683 OldMethod->getLexicalDeclContext() == 684 NewMethod->getLexicalDeclContext()) { 685 // -- Member function declarations with the same name and the 686 // same parameter types cannot be overloaded if any of them 687 // is a static member function declaration. 688 if (OldMethod->isStatic() || NewMethod->isStatic()) { 689 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 690 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 691 return true; 692 } 693 694 // C++ [class.mem]p1: 695 // [...] A member shall not be declared twice in the 696 // member-specification, except that a nested class or member 697 // class template can be declared and then later defined. 698 unsigned NewDiag; 699 if (isa<CXXConstructorDecl>(OldMethod)) 700 NewDiag = diag::err_constructor_redeclared; 701 else if (isa<CXXDestructorDecl>(NewMethod)) 702 NewDiag = diag::err_destructor_redeclared; 703 else if (isa<CXXConversionDecl>(NewMethod)) 704 NewDiag = diag::err_conv_function_redeclared; 705 else 706 NewDiag = diag::err_member_redeclared; 707 708 Diag(New->getLocation(), NewDiag); 709 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 710 } 711 712 // (C++98 8.3.5p3): 713 // All declarations for a function shall agree exactly in both the 714 // return type and the parameter-type-list. 715 if (OldQType == NewQType) 716 return MergeCompatibleFunctionDecls(New, Old); 717 718 // Fall through for conflicting redeclarations and redefinitions. 719 } 720 721 // C: Function types need to be compatible, not identical. This handles 722 // duplicate function decls like "void f(int); void f(enum X);" properly. 723 if (!getLangOptions().CPlusPlus && 724 Context.typesAreCompatible(OldQType, NewQType)) { 725 const FunctionType *OldFuncType = OldQType->getAsFunctionType(); 726 const FunctionType *NewFuncType = NewQType->getAsFunctionType(); 727 const FunctionProtoType *OldProto = 0; 728 if (isa<FunctionNoProtoType>(NewFuncType) && 729 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 730 // The old declaration provided a function prototype, but the 731 // new declaration does not. Merge in the prototype. 732 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 733 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 734 OldProto->arg_type_end()); 735 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 736 ParamTypes.data(), ParamTypes.size(), 737 OldProto->isVariadic(), 738 OldProto->getTypeQuals()); 739 New->setType(NewQType); 740 New->setHasInheritedPrototype(); 741 742 // Synthesize a parameter for each argument type. 743 llvm::SmallVector<ParmVarDecl*, 16> Params; 744 for (FunctionProtoType::arg_type_iterator 745 ParamType = OldProto->arg_type_begin(), 746 ParamEnd = OldProto->arg_type_end(); 747 ParamType != ParamEnd; ++ParamType) { 748 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 749 SourceLocation(), 0, 750 *ParamType, VarDecl::None, 751 0); 752 Param->setImplicit(); 753 Params.push_back(Param); 754 } 755 756 New->setParams(Context, Params.data(), Params.size()); 757 } 758 759 return MergeCompatibleFunctionDecls(New, Old); 760 } 761 762 // GNU C permits a K&R definition to follow a prototype declaration 763 // if the declared types of the parameters in the K&R definition 764 // match the types in the prototype declaration, even when the 765 // promoted types of the parameters from the K&R definition differ 766 // from the types in the prototype. GCC then keeps the types from 767 // the prototype. 768 // 769 // If a variadic prototype is followed by a non-variadic K&R definition, 770 // the K&R definition becomes variadic. This is sort of an edge case, but 771 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 772 // C99 6.9.1p8. 773 if (!getLangOptions().CPlusPlus && 774 Old->hasPrototype() && !New->hasPrototype() && 775 New->getType()->getAsFunctionProtoType() && 776 Old->getNumParams() == New->getNumParams()) { 777 llvm::SmallVector<QualType, 16> ArgTypes; 778 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 779 const FunctionProtoType *OldProto 780 = Old->getType()->getAsFunctionProtoType(); 781 const FunctionProtoType *NewProto 782 = New->getType()->getAsFunctionProtoType(); 783 784 // Determine whether this is the GNU C extension. 785 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 786 NewProto->getResultType()); 787 bool LooseCompatible = !MergedReturn.isNull(); 788 for (unsigned Idx = 0, End = Old->getNumParams(); 789 LooseCompatible && Idx != End; ++Idx) { 790 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 791 ParmVarDecl *NewParm = New->getParamDecl(Idx); 792 if (Context.typesAreCompatible(OldParm->getType(), 793 NewProto->getArgType(Idx))) { 794 ArgTypes.push_back(NewParm->getType()); 795 } else if (Context.typesAreCompatible(OldParm->getType(), 796 NewParm->getType())) { 797 GNUCompatibleParamWarning Warn 798 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 799 Warnings.push_back(Warn); 800 ArgTypes.push_back(NewParm->getType()); 801 } else 802 LooseCompatible = false; 803 } 804 805 if (LooseCompatible) { 806 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 807 Diag(Warnings[Warn].NewParm->getLocation(), 808 diag::ext_param_promoted_not_compatible_with_prototype) 809 << Warnings[Warn].PromotedType 810 << Warnings[Warn].OldParm->getType(); 811 Diag(Warnings[Warn].OldParm->getLocation(), 812 diag::note_previous_declaration); 813 } 814 815 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 816 ArgTypes.size(), 817 OldProto->isVariadic(), 0)); 818 return MergeCompatibleFunctionDecls(New, Old); 819 } 820 821 // Fall through to diagnose conflicting types. 822 } 823 824 // A function that has already been declared has been redeclared or defined 825 // with a different type- show appropriate diagnostic 826 if (unsigned BuiltinID = Old->getBuiltinID(Context)) { 827 // The user has declared a builtin function with an incompatible 828 // signature. 829 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 830 // The function the user is redeclaring is a library-defined 831 // function like 'malloc' or 'printf'. Warn about the 832 // redeclaration, then pretend that we don't know about this 833 // library built-in. 834 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 835 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 836 << Old << Old->getType(); 837 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 838 Old->setInvalidDecl(); 839 return false; 840 } 841 842 PrevDiag = diag::note_previous_builtin_declaration; 843 } 844 845 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 846 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 847 return true; 848} 849 850/// \brief Completes the merge of two function declarations that are 851/// known to be compatible. 852/// 853/// This routine handles the merging of attributes and other 854/// properties of function declarations form the old declaration to 855/// the new declaration, once we know that New is in fact a 856/// redeclaration of Old. 857/// 858/// \returns false 859bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 860 // Merge the attributes 861 MergeAttributes(New, Old, Context); 862 863 // Merge the storage class. 864 if (Old->getStorageClass() != FunctionDecl::Extern) 865 New->setStorageClass(Old->getStorageClass()); 866 867 // Merge "inline" 868 if (Old->isInline()) 869 New->setInline(true); 870 871 // If this function declaration by itself qualifies as a C99 inline 872 // definition (C99 6.7.4p6), but the previous definition did not, 873 // then the function is not a C99 inline definition. 874 if (New->isC99InlineDefinition() && !Old->isC99InlineDefinition()) 875 New->setC99InlineDefinition(false); 876 else if (Old->isC99InlineDefinition() && !New->isC99InlineDefinition()) { 877 // Mark all preceding definitions as not being C99 inline definitions. 878 for (const FunctionDecl *Prev = Old; Prev; 879 Prev = Prev->getPreviousDeclaration()) 880 const_cast<FunctionDecl *>(Prev)->setC99InlineDefinition(false); 881 } 882 883 // Merge "pure" flag. 884 if (Old->isPure()) 885 New->setPure(); 886 887 // Merge the "deleted" flag. 888 if (Old->isDeleted()) 889 New->setDeleted(); 890 891 if (getLangOptions().CPlusPlus) 892 return MergeCXXFunctionDecl(New, Old); 893 894 return false; 895} 896 897/// MergeVarDecl - We just parsed a variable 'New' which has the same name 898/// and scope as a previous declaration 'Old'. Figure out how to resolve this 899/// situation, merging decls or emitting diagnostics as appropriate. 900/// 901/// Tentative definition rules (C99 6.9.2p2) are checked by 902/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 903/// definitions here, since the initializer hasn't been attached. 904/// 905void Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 906 // If either decl is invalid, make sure the new one is marked invalid and 907 // don't do any other checking. 908 if (New->isInvalidDecl() || OldD->isInvalidDecl()) 909 return New->setInvalidDecl(); 910 911 // Verify the old decl was also a variable. 912 VarDecl *Old = dyn_cast<VarDecl>(OldD); 913 if (!Old) { 914 Diag(New->getLocation(), diag::err_redefinition_different_kind) 915 << New->getDeclName(); 916 Diag(OldD->getLocation(), diag::note_previous_definition); 917 return New->setInvalidDecl(); 918 } 919 920 MergeAttributes(New, Old, Context); 921 922 // Merge the types 923 QualType MergedT; 924 if (getLangOptions().CPlusPlus) { 925 if (Context.hasSameType(New->getType(), Old->getType())) 926 MergedT = New->getType(); 927 } else { 928 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 929 } 930 if (MergedT.isNull()) { 931 Diag(New->getLocation(), diag::err_redefinition_different_type) 932 << New->getDeclName(); 933 Diag(Old->getLocation(), diag::note_previous_definition); 934 return New->setInvalidDecl(); 935 } 936 New->setType(MergedT); 937 938 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 939 if (New->getStorageClass() == VarDecl::Static && 940 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 941 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 942 Diag(Old->getLocation(), diag::note_previous_definition); 943 return New->setInvalidDecl(); 944 } 945 // C99 6.2.2p4: 946 // For an identifier declared with the storage-class specifier 947 // extern in a scope in which a prior declaration of that 948 // identifier is visible,23) if the prior declaration specifies 949 // internal or external linkage, the linkage of the identifier at 950 // the later declaration is the same as the linkage specified at 951 // the prior declaration. If no prior declaration is visible, or 952 // if the prior declaration specifies no linkage, then the 953 // identifier has external linkage. 954 if (New->hasExternalStorage() && Old->hasLinkage()) 955 /* Okay */; 956 else if (New->getStorageClass() != VarDecl::Static && 957 Old->getStorageClass() == VarDecl::Static) { 958 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 959 Diag(Old->getLocation(), diag::note_previous_definition); 960 return New->setInvalidDecl(); 961 } 962 963 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 964 965 // FIXME: The test for external storage here seems wrong? We still 966 // need to check for mismatches. 967 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 968 // Don't complain about out-of-line definitions of static members. 969 !(Old->getLexicalDeclContext()->isRecord() && 970 !New->getLexicalDeclContext()->isRecord())) { 971 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 972 Diag(Old->getLocation(), diag::note_previous_definition); 973 return New->setInvalidDecl(); 974 } 975 976 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 977 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 978 Diag(Old->getLocation(), diag::note_previous_definition); 979 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 980 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 981 Diag(Old->getLocation(), diag::note_previous_definition); 982 } 983 984 // Keep a chain of previous declarations. 985 New->setPreviousDeclaration(Old); 986} 987 988/// CheckParmsForFunctionDef - Check that the parameters of the given 989/// function are appropriate for the definition of a function. This 990/// takes care of any checks that cannot be performed on the 991/// declaration itself, e.g., that the types of each of the function 992/// parameters are complete. 993bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 994 bool HasInvalidParm = false; 995 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 996 ParmVarDecl *Param = FD->getParamDecl(p); 997 998 // C99 6.7.5.3p4: the parameters in a parameter type list in a 999 // function declarator that is part of a function definition of 1000 // that function shall not have incomplete type. 1001 // 1002 // This is also C++ [dcl.fct]p6. 1003 if (!Param->isInvalidDecl() && 1004 RequireCompleteType(Param->getLocation(), Param->getType(), 1005 diag::err_typecheck_decl_incomplete_type)) { 1006 Param->setInvalidDecl(); 1007 HasInvalidParm = true; 1008 } 1009 1010 // C99 6.9.1p5: If the declarator includes a parameter type list, the 1011 // declaration of each parameter shall include an identifier. 1012 if (Param->getIdentifier() == 0 && 1013 !Param->isImplicit() && 1014 !getLangOptions().CPlusPlus) 1015 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 1016 } 1017 1018 return HasInvalidParm; 1019} 1020 1021/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1022/// no declarator (e.g. "struct foo;") is parsed. 1023Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1024 // FIXME: Error on auto/register at file scope 1025 // FIXME: Error on inline/virtual/explicit 1026 // FIXME: Error on invalid restrict 1027 // FIXME: Warn on useless __thread 1028 // FIXME: Warn on useless const/volatile 1029 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1030 // FIXME: Warn on useless attributes 1031 TagDecl *Tag = 0; 1032 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1033 DS.getTypeSpecType() == DeclSpec::TST_struct || 1034 DS.getTypeSpecType() == DeclSpec::TST_union || 1035 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1036 if (!DS.getTypeRep()) // We probably had an error 1037 return DeclPtrTy(); 1038 1039 Tag = dyn_cast<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 1040 } 1041 1042 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1043 if (!Record->getDeclName() && Record->isDefinition() && 1044 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1045 if (getLangOptions().CPlusPlus || 1046 Record->getDeclContext()->isRecord()) 1047 return BuildAnonymousStructOrUnion(S, DS, Record); 1048 1049 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1050 << DS.getSourceRange(); 1051 } 1052 1053 // Microsoft allows unnamed struct/union fields. Don't complain 1054 // about them. 1055 // FIXME: Should we support Microsoft's extensions in this area? 1056 if (Record->getDeclName() && getLangOptions().Microsoft) 1057 return DeclPtrTy::make(Tag); 1058 } 1059 1060 if (!DS.isMissingDeclaratorOk() && 1061 DS.getTypeSpecType() != DeclSpec::TST_error) { 1062 // Warn about typedefs of enums without names, since this is an 1063 // extension in both Microsoft an GNU. 1064 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1065 Tag && isa<EnumDecl>(Tag)) { 1066 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1067 << DS.getSourceRange(); 1068 return DeclPtrTy::make(Tag); 1069 } 1070 1071 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1072 << DS.getSourceRange(); 1073 return DeclPtrTy(); 1074 } 1075 1076 return DeclPtrTy::make(Tag); 1077} 1078 1079/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1080/// anonymous struct or union AnonRecord into the owning context Owner 1081/// and scope S. This routine will be invoked just after we realize 1082/// that an unnamed union or struct is actually an anonymous union or 1083/// struct, e.g., 1084/// 1085/// @code 1086/// union { 1087/// int i; 1088/// float f; 1089/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1090/// // f into the surrounding scope.x 1091/// @endcode 1092/// 1093/// This routine is recursive, injecting the names of nested anonymous 1094/// structs/unions into the owning context and scope as well. 1095bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1096 RecordDecl *AnonRecord) { 1097 bool Invalid = false; 1098 for (RecordDecl::field_iterator F = AnonRecord->field_begin(Context), 1099 FEnd = AnonRecord->field_end(Context); 1100 F != FEnd; ++F) { 1101 if ((*F)->getDeclName()) { 1102 NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 1103 LookupOrdinaryName, true); 1104 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 1105 // C++ [class.union]p2: 1106 // The names of the members of an anonymous union shall be 1107 // distinct from the names of any other entity in the 1108 // scope in which the anonymous union is declared. 1109 unsigned diagKind 1110 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 1111 : diag::err_anonymous_struct_member_redecl; 1112 Diag((*F)->getLocation(), diagKind) 1113 << (*F)->getDeclName(); 1114 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1115 Invalid = true; 1116 } else { 1117 // C++ [class.union]p2: 1118 // For the purpose of name lookup, after the anonymous union 1119 // definition, the members of the anonymous union are 1120 // considered to have been defined in the scope in which the 1121 // anonymous union is declared. 1122 Owner->makeDeclVisibleInContext(Context, *F); 1123 S->AddDecl(DeclPtrTy::make(*F)); 1124 IdResolver.AddDecl(*F); 1125 } 1126 } else if (const RecordType *InnerRecordType 1127 = (*F)->getType()->getAsRecordType()) { 1128 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1129 if (InnerRecord->isAnonymousStructOrUnion()) 1130 Invalid = Invalid || 1131 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1132 } 1133 } 1134 1135 return Invalid; 1136} 1137 1138/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1139/// anonymous structure or union. Anonymous unions are a C++ feature 1140/// (C++ [class.union]) and a GNU C extension; anonymous structures 1141/// are a GNU C and GNU C++ extension. 1142Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1143 RecordDecl *Record) { 1144 DeclContext *Owner = Record->getDeclContext(); 1145 1146 // Diagnose whether this anonymous struct/union is an extension. 1147 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1148 Diag(Record->getLocation(), diag::ext_anonymous_union); 1149 else if (!Record->isUnion()) 1150 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1151 1152 // C and C++ require different kinds of checks for anonymous 1153 // structs/unions. 1154 bool Invalid = false; 1155 if (getLangOptions().CPlusPlus) { 1156 const char* PrevSpec = 0; 1157 // C++ [class.union]p3: 1158 // Anonymous unions declared in a named namespace or in the 1159 // global namespace shall be declared static. 1160 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1161 (isa<TranslationUnitDecl>(Owner) || 1162 (isa<NamespaceDecl>(Owner) && 1163 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1164 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1165 Invalid = true; 1166 1167 // Recover by adding 'static'. 1168 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); 1169 } 1170 // C++ [class.union]p3: 1171 // A storage class is not allowed in a declaration of an 1172 // anonymous union in a class scope. 1173 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1174 isa<RecordDecl>(Owner)) { 1175 Diag(DS.getStorageClassSpecLoc(), 1176 diag::err_anonymous_union_with_storage_spec); 1177 Invalid = true; 1178 1179 // Recover by removing the storage specifier. 1180 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1181 PrevSpec); 1182 } 1183 1184 // C++ [class.union]p2: 1185 // The member-specification of an anonymous union shall only 1186 // define non-static data members. [Note: nested types and 1187 // functions cannot be declared within an anonymous union. ] 1188 for (DeclContext::decl_iterator Mem = Record->decls_begin(Context), 1189 MemEnd = Record->decls_end(Context); 1190 Mem != MemEnd; ++Mem) { 1191 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1192 // C++ [class.union]p3: 1193 // An anonymous union shall not have private or protected 1194 // members (clause 11). 1195 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1196 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1197 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1198 Invalid = true; 1199 } 1200 } else if ((*Mem)->isImplicit()) { 1201 // Any implicit members are fine. 1202 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1203 // This is a type that showed up in an 1204 // elaborated-type-specifier inside the anonymous struct or 1205 // union, but which actually declares a type outside of the 1206 // anonymous struct or union. It's okay. 1207 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1208 if (!MemRecord->isAnonymousStructOrUnion() && 1209 MemRecord->getDeclName()) { 1210 // This is a nested type declaration. 1211 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1212 << (int)Record->isUnion(); 1213 Invalid = true; 1214 } 1215 } else { 1216 // We have something that isn't a non-static data 1217 // member. Complain about it. 1218 unsigned DK = diag::err_anonymous_record_bad_member; 1219 if (isa<TypeDecl>(*Mem)) 1220 DK = diag::err_anonymous_record_with_type; 1221 else if (isa<FunctionDecl>(*Mem)) 1222 DK = diag::err_anonymous_record_with_function; 1223 else if (isa<VarDecl>(*Mem)) 1224 DK = diag::err_anonymous_record_with_static; 1225 Diag((*Mem)->getLocation(), DK) 1226 << (int)Record->isUnion(); 1227 Invalid = true; 1228 } 1229 } 1230 } 1231 1232 if (!Record->isUnion() && !Owner->isRecord()) { 1233 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1234 << (int)getLangOptions().CPlusPlus; 1235 Invalid = true; 1236 } 1237 1238 // Create a declaration for this anonymous struct/union. 1239 NamedDecl *Anon = 0; 1240 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1241 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1242 /*IdentifierInfo=*/0, 1243 Context.getTypeDeclType(Record), 1244 /*BitWidth=*/0, /*Mutable=*/false); 1245 Anon->setAccess(AS_public); 1246 if (getLangOptions().CPlusPlus) 1247 FieldCollector->Add(cast<FieldDecl>(Anon)); 1248 } else { 1249 VarDecl::StorageClass SC; 1250 switch (DS.getStorageClassSpec()) { 1251 default: assert(0 && "Unknown storage class!"); 1252 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1253 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1254 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1255 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1256 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1257 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1258 case DeclSpec::SCS_mutable: 1259 // mutable can only appear on non-static class members, so it's always 1260 // an error here 1261 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1262 Invalid = true; 1263 SC = VarDecl::None; 1264 break; 1265 } 1266 1267 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1268 /*IdentifierInfo=*/0, 1269 Context.getTypeDeclType(Record), 1270 SC, DS.getSourceRange().getBegin()); 1271 } 1272 Anon->setImplicit(); 1273 1274 // Add the anonymous struct/union object to the current 1275 // context. We'll be referencing this object when we refer to one of 1276 // its members. 1277 Owner->addDecl(Context, Anon); 1278 1279 // Inject the members of the anonymous struct/union into the owning 1280 // context and into the identifier resolver chain for name lookup 1281 // purposes. 1282 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1283 Invalid = true; 1284 1285 // Mark this as an anonymous struct/union type. Note that we do not 1286 // do this until after we have already checked and injected the 1287 // members of this anonymous struct/union type, because otherwise 1288 // the members could be injected twice: once by DeclContext when it 1289 // builds its lookup table, and once by 1290 // InjectAnonymousStructOrUnionMembers. 1291 Record->setAnonymousStructOrUnion(true); 1292 1293 if (Invalid) 1294 Anon->setInvalidDecl(); 1295 1296 return DeclPtrTy::make(Anon); 1297} 1298 1299 1300/// GetNameForDeclarator - Determine the full declaration name for the 1301/// given Declarator. 1302DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1303 switch (D.getKind()) { 1304 case Declarator::DK_Abstract: 1305 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 1306 return DeclarationName(); 1307 1308 case Declarator::DK_Normal: 1309 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 1310 return DeclarationName(D.getIdentifier()); 1311 1312 case Declarator::DK_Constructor: { 1313 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1314 Ty = Context.getCanonicalType(Ty); 1315 return Context.DeclarationNames.getCXXConstructorName(Ty); 1316 } 1317 1318 case Declarator::DK_Destructor: { 1319 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1320 Ty = Context.getCanonicalType(Ty); 1321 return Context.DeclarationNames.getCXXDestructorName(Ty); 1322 } 1323 1324 case Declarator::DK_Conversion: { 1325 // FIXME: We'd like to keep the non-canonical type for diagnostics! 1326 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1327 Ty = Context.getCanonicalType(Ty); 1328 return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 1329 } 1330 1331 case Declarator::DK_Operator: 1332 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 1333 return Context.DeclarationNames.getCXXOperatorName( 1334 D.getOverloadedOperator()); 1335 } 1336 1337 assert(false && "Unknown name kind"); 1338 return DeclarationName(); 1339} 1340 1341/// isNearlyMatchingFunction - Determine whether the C++ functions 1342/// Declaration and Definition are "nearly" matching. This heuristic 1343/// is used to improve diagnostics in the case where an out-of-line 1344/// function definition doesn't match any declaration within 1345/// the class or namespace. 1346static bool isNearlyMatchingFunction(ASTContext &Context, 1347 FunctionDecl *Declaration, 1348 FunctionDecl *Definition) { 1349 if (Declaration->param_size() != Definition->param_size()) 1350 return false; 1351 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1352 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1353 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1354 1355 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1356 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 1357 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1358 return false; 1359 } 1360 1361 return true; 1362} 1363 1364Sema::DeclPtrTy 1365Sema::ActOnDeclarator(Scope *S, Declarator &D, bool IsFunctionDefinition) { 1366 DeclarationName Name = GetNameForDeclarator(D); 1367 1368 // All of these full declarators require an identifier. If it doesn't have 1369 // one, the ParsedFreeStandingDeclSpec action should be used. 1370 if (!Name) { 1371 if (!D.isInvalidType()) // Reject this if we think it is valid. 1372 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1373 diag::err_declarator_need_ident) 1374 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1375 return DeclPtrTy(); 1376 } 1377 1378 // The scope passed in may not be a decl scope. Zip up the scope tree until 1379 // we find one that is. 1380 while ((S->getFlags() & Scope::DeclScope) == 0 || 1381 (S->getFlags() & Scope::TemplateParamScope) != 0) 1382 S = S->getParent(); 1383 1384 DeclContext *DC; 1385 NamedDecl *PrevDecl; 1386 NamedDecl *New; 1387 1388 QualType R = GetTypeForDeclarator(D, S); 1389 1390 // See if this is a redefinition of a variable in the same scope. 1391 if (D.getCXXScopeSpec().isInvalid()) { 1392 DC = CurContext; 1393 PrevDecl = 0; 1394 D.setInvalidType(); 1395 } else if (!D.getCXXScopeSpec().isSet()) { 1396 LookupNameKind NameKind = LookupOrdinaryName; 1397 1398 // If the declaration we're planning to build will be a function 1399 // or object with linkage, then look for another declaration with 1400 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1401 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1402 /* Do nothing*/; 1403 else if (R->isFunctionType()) { 1404 if (CurContext->isFunctionOrMethod()) 1405 NameKind = LookupRedeclarationWithLinkage; 1406 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1407 NameKind = LookupRedeclarationWithLinkage; 1408 1409 DC = CurContext; 1410 PrevDecl = LookupName(S, Name, NameKind, true, 1411 D.getDeclSpec().getStorageClassSpec() != 1412 DeclSpec::SCS_static, 1413 D.getIdentifierLoc()); 1414 } else { // Something like "int foo::x;" 1415 DC = computeDeclContext(D.getCXXScopeSpec()); 1416 // FIXME: RequireCompleteDeclContext(D.getCXXScopeSpec()); ? 1417 PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName, true); 1418 1419 // C++ 7.3.1.2p2: 1420 // Members (including explicit specializations of templates) of a named 1421 // namespace can also be defined outside that namespace by explicit 1422 // qualification of the name being defined, provided that the entity being 1423 // defined was already declared in the namespace and the definition appears 1424 // after the point of declaration in a namespace that encloses the 1425 // declarations namespace. 1426 // 1427 // Note that we only check the context at this point. We don't yet 1428 // have enough information to make sure that PrevDecl is actually 1429 // the declaration we want to match. For example, given: 1430 // 1431 // class X { 1432 // void f(); 1433 // void f(float); 1434 // }; 1435 // 1436 // void X::f(int) { } // ill-formed 1437 // 1438 // In this case, PrevDecl will point to the overload set 1439 // containing the two f's declared in X, but neither of them 1440 // matches. 1441 1442 // First check whether we named the global scope. 1443 if (isa<TranslationUnitDecl>(DC)) { 1444 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1445 << Name << D.getCXXScopeSpec().getRange(); 1446 } else if (!CurContext->Encloses(DC)) { 1447 // The qualifying scope doesn't enclose the original declaration. 1448 // Emit diagnostic based on current scope. 1449 SourceLocation L = D.getIdentifierLoc(); 1450 SourceRange R = D.getCXXScopeSpec().getRange(); 1451 if (isa<FunctionDecl>(CurContext)) 1452 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1453 else 1454 Diag(L, diag::err_invalid_declarator_scope) 1455 << Name << cast<NamedDecl>(DC) << R; 1456 D.setInvalidType(); 1457 } 1458 } 1459 1460 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1461 // Maybe we will complain about the shadowed template parameter. 1462 if (!D.isInvalidType()) 1463 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl)) 1464 D.setInvalidType(); 1465 1466 // Just pretend that we didn't see the previous declaration. 1467 PrevDecl = 0; 1468 } 1469 1470 // In C++, the previous declaration we find might be a tag type 1471 // (class or enum). In this case, the new declaration will hide the 1472 // tag type. Note that this does does not apply if we're declaring a 1473 // typedef (C++ [dcl.typedef]p4). 1474 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 1475 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1476 PrevDecl = 0; 1477 1478 bool Redeclaration = false; 1479 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1480 New = ActOnTypedefDeclarator(S, D, DC, R, PrevDecl, Redeclaration); 1481 } else if (R->isFunctionType()) { 1482 New = ActOnFunctionDeclarator(S, D, DC, R, PrevDecl, 1483 IsFunctionDefinition, Redeclaration); 1484 } else { 1485 New = ActOnVariableDeclarator(S, D, DC, R, PrevDecl, Redeclaration); 1486 } 1487 1488 if (New == 0) 1489 return DeclPtrTy(); 1490 1491 // If this has an identifier and is not an invalid redeclaration, 1492 // add it to the scope stack. 1493 if (Name && !(Redeclaration && New->isInvalidDecl())) 1494 PushOnScopeChains(New, S); 1495 1496 return DeclPtrTy::make(New); 1497} 1498 1499/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 1500/// types into constant array types in certain situations which would otherwise 1501/// be errors (for GCC compatibility). 1502static QualType TryToFixInvalidVariablyModifiedType(QualType T, 1503 ASTContext &Context, 1504 bool &SizeIsNegative) { 1505 // This method tries to turn a variable array into a constant 1506 // array even when the size isn't an ICE. This is necessary 1507 // for compatibility with code that depends on gcc's buggy 1508 // constant expression folding, like struct {char x[(int)(char*)2];} 1509 SizeIsNegative = false; 1510 1511 if (const PointerType* PTy = dyn_cast<PointerType>(T)) { 1512 QualType Pointee = PTy->getPointeeType(); 1513 QualType FixedType = 1514 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 1515 if (FixedType.isNull()) return FixedType; 1516 FixedType = Context.getPointerType(FixedType); 1517 FixedType.setCVRQualifiers(T.getCVRQualifiers()); 1518 return FixedType; 1519 } 1520 1521 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 1522 if (!VLATy) 1523 return QualType(); 1524 // FIXME: We should probably handle this case 1525 if (VLATy->getElementType()->isVariablyModifiedType()) 1526 return QualType(); 1527 1528 Expr::EvalResult EvalResult; 1529 if (!VLATy->getSizeExpr() || 1530 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 1531 !EvalResult.Val.isInt()) 1532 return QualType(); 1533 1534 llvm::APSInt &Res = EvalResult.Val.getInt(); 1535 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) 1536 return Context.getConstantArrayType(VLATy->getElementType(), 1537 Res, ArrayType::Normal, 0); 1538 1539 SizeIsNegative = true; 1540 return QualType(); 1541} 1542 1543/// \brief Register the given locally-scoped external C declaration so 1544/// that it can be found later for redeclarations 1545void 1546Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, NamedDecl *PrevDecl, 1547 Scope *S) { 1548 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 1549 "Decl is not a locally-scoped decl!"); 1550 // Note that we have a locally-scoped external with this name. 1551 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 1552 1553 if (!PrevDecl) 1554 return; 1555 1556 // If there was a previous declaration of this variable, it may be 1557 // in our identifier chain. Update the identifier chain with the new 1558 // declaration. 1559 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 1560 // The previous declaration was found on the identifer resolver 1561 // chain, so remove it from its scope. 1562 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 1563 S = S->getParent(); 1564 1565 if (S) 1566 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 1567 } 1568} 1569 1570/// \brief Diagnose function specifiers on a declaration of an identifier that 1571/// does not identify a function. 1572void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 1573 // FIXME: We should probably indicate the identifier in question to avoid 1574 // confusion for constructs like "inline int a(), b;" 1575 if (D.getDeclSpec().isInlineSpecified()) 1576 Diag(D.getDeclSpec().getInlineSpecLoc(), 1577 diag::err_inline_non_function); 1578 1579 if (D.getDeclSpec().isVirtualSpecified()) 1580 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1581 diag::err_virtual_non_function); 1582 1583 if (D.getDeclSpec().isExplicitSpecified()) 1584 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1585 diag::err_explicit_non_function); 1586} 1587 1588NamedDecl* 1589Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1590 QualType R, Decl* PrevDecl, bool &Redeclaration) { 1591 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1592 if (D.getCXXScopeSpec().isSet()) { 1593 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1594 << D.getCXXScopeSpec().getRange(); 1595 D.setInvalidType(); 1596 // Pretend we didn't see the scope specifier. 1597 DC = 0; 1598 } 1599 1600 if (getLangOptions().CPlusPlus) { 1601 // Check that there are no default arguments (C++ only). 1602 CheckExtraCXXDefaultArguments(D); 1603 } 1604 1605 DiagnoseFunctionSpecifiers(D); 1606 1607 if (D.getDeclSpec().isThreadSpecified()) 1608 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 1609 1610 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R); 1611 if (!NewTD) return 0; 1612 1613 if (D.isInvalidType()) 1614 NewTD->setInvalidDecl(); 1615 1616 // Handle attributes prior to checking for duplicates in MergeVarDecl 1617 ProcessDeclAttributes(NewTD, D); 1618 // Merge the decl with the existing one if appropriate. If the decl is 1619 // in an outer scope, it isn't the same thing. 1620 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1621 Redeclaration = true; 1622 MergeTypeDefDecl(NewTD, PrevDecl); 1623 } 1624 1625 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1626 // then it shall have block scope. 1627 QualType T = NewTD->getUnderlyingType(); 1628 if (T->isVariablyModifiedType()) { 1629 CurFunctionNeedsScopeChecking = true; 1630 1631 if (S->getFnParent() == 0) { 1632 bool SizeIsNegative; 1633 QualType FixedTy = 1634 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1635 if (!FixedTy.isNull()) { 1636 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 1637 NewTD->setUnderlyingType(FixedTy); 1638 } else { 1639 if (SizeIsNegative) 1640 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 1641 else if (T->isVariableArrayType()) 1642 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1643 else 1644 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1645 NewTD->setInvalidDecl(); 1646 } 1647 } 1648 } 1649 return NewTD; 1650} 1651 1652/// \brief Determines whether the given declaration is an out-of-scope 1653/// previous declaration. 1654/// 1655/// This routine should be invoked when name lookup has found a 1656/// previous declaration (PrevDecl) that is not in the scope where a 1657/// new declaration by the same name is being introduced. If the new 1658/// declaration occurs in a local scope, previous declarations with 1659/// linkage may still be considered previous declarations (C99 1660/// 6.2.2p4-5, C++ [basic.link]p6). 1661/// 1662/// \param PrevDecl the previous declaration found by name 1663/// lookup 1664/// 1665/// \param DC the context in which the new declaration is being 1666/// declared. 1667/// 1668/// \returns true if PrevDecl is an out-of-scope previous declaration 1669/// for a new delcaration with the same name. 1670static bool 1671isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 1672 ASTContext &Context) { 1673 if (!PrevDecl) 1674 return 0; 1675 1676 // FIXME: PrevDecl could be an OverloadedFunctionDecl, in which 1677 // case we need to check each of the overloaded functions. 1678 if (!PrevDecl->hasLinkage()) 1679 return false; 1680 1681 if (Context.getLangOptions().CPlusPlus) { 1682 // C++ [basic.link]p6: 1683 // If there is a visible declaration of an entity with linkage 1684 // having the same name and type, ignoring entities declared 1685 // outside the innermost enclosing namespace scope, the block 1686 // scope declaration declares that same entity and receives the 1687 // linkage of the previous declaration. 1688 DeclContext *OuterContext = DC->getLookupContext(); 1689 if (!OuterContext->isFunctionOrMethod()) 1690 // This rule only applies to block-scope declarations. 1691 return false; 1692 else { 1693 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 1694 if (PrevOuterContext->isRecord()) 1695 // We found a member function: ignore it. 1696 return false; 1697 else { 1698 // Find the innermost enclosing namespace for the new and 1699 // previous declarations. 1700 while (!OuterContext->isFileContext()) 1701 OuterContext = OuterContext->getParent(); 1702 while (!PrevOuterContext->isFileContext()) 1703 PrevOuterContext = PrevOuterContext->getParent(); 1704 1705 // The previous declaration is in a different namespace, so it 1706 // isn't the same function. 1707 if (OuterContext->getPrimaryContext() != 1708 PrevOuterContext->getPrimaryContext()) 1709 return false; 1710 } 1711 } 1712 } 1713 1714 return true; 1715} 1716 1717NamedDecl* 1718Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1719 QualType R,NamedDecl* PrevDecl, 1720 bool &Redeclaration) { 1721 DeclarationName Name = GetNameForDeclarator(D); 1722 1723 // Check that there are no default arguments (C++ only). 1724 if (getLangOptions().CPlusPlus) 1725 CheckExtraCXXDefaultArguments(D); 1726 1727 VarDecl *NewVD; 1728 VarDecl::StorageClass SC; 1729 switch (D.getDeclSpec().getStorageClassSpec()) { 1730 default: assert(0 && "Unknown storage class!"); 1731 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1732 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1733 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1734 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1735 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1736 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1737 case DeclSpec::SCS_mutable: 1738 // mutable can only appear on non-static class members, so it's always 1739 // an error here 1740 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1741 D.setInvalidType(); 1742 SC = VarDecl::None; 1743 break; 1744 } 1745 1746 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1747 if (!II) { 1748 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1749 << Name.getAsString(); 1750 return 0; 1751 } 1752 1753 DiagnoseFunctionSpecifiers(D); 1754 1755 if (!DC->isRecord() && S->getFnParent() == 0) { 1756 // C99 6.9p2: The storage-class specifiers auto and register shall not 1757 // appear in the declaration specifiers in an external declaration. 1758 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 1759 1760 // If this is a register variable with an asm label specified, then this 1761 // is a GNU extension. 1762 if (SC == VarDecl::Register && D.getAsmLabel()) 1763 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 1764 else 1765 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 1766 D.setInvalidType(); 1767 } 1768 } 1769 if (DC->isRecord() && !CurContext->isRecord()) { 1770 // This is an out-of-line definition of a static data member. 1771 if (SC == VarDecl::Static) { 1772 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1773 diag::err_static_out_of_line) 1774 << CodeModificationHint::CreateRemoval( 1775 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 1776 } else if (SC == VarDecl::None) 1777 SC = VarDecl::Static; 1778 } 1779 1780 // The variable can not 1781 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1782 II, R, SC, 1783 // FIXME: Move to DeclGroup... 1784 D.getDeclSpec().getSourceRange().getBegin()); 1785 1786 if (D.isInvalidType()) 1787 NewVD->setInvalidDecl(); 1788 1789 if (D.getDeclSpec().isThreadSpecified()) { 1790 if (NewVD->hasLocalStorage()) 1791 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 1792 else if (!Context.Target.isTLSSupported()) 1793 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 1794 else 1795 NewVD->setThreadSpecified(true); 1796 } 1797 1798 // Set the lexical context. If the declarator has a C++ scope specifier, the 1799 // lexical context will be different from the semantic context. 1800 NewVD->setLexicalDeclContext(CurContext); 1801 1802 // Handle attributes prior to checking for duplicates in MergeVarDecl 1803 ProcessDeclAttributes(NewVD, D); 1804 1805 // Handle GNU asm-label extension (encoded as an attribute). 1806 if (Expr *E = (Expr*) D.getAsmLabel()) { 1807 // The parser guarantees this is a string. 1808 StringLiteral *SE = cast<StringLiteral>(E); 1809 NewVD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 1810 SE->getByteLength()))); 1811 } 1812 1813 // If name lookup finds a previous declaration that is not in the 1814 // same scope as the new declaration, this may still be an 1815 // acceptable redeclaration. 1816 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 1817 !(NewVD->hasLinkage() && 1818 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 1819 PrevDecl = 0; 1820 1821 // Merge the decl with the existing one if appropriate. 1822 if (PrevDecl) { 1823 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 1824 // The user tried to define a non-static data member 1825 // out-of-line (C++ [dcl.meaning]p1). 1826 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 1827 << D.getCXXScopeSpec().getRange(); 1828 PrevDecl = 0; 1829 NewVD->setInvalidDecl(); 1830 } 1831 } else if (D.getCXXScopeSpec().isSet()) { 1832 // No previous declaration in the qualifying scope. 1833 Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 1834 << Name << D.getCXXScopeSpec().getRange(); 1835 NewVD->setInvalidDecl(); 1836 } 1837 1838 CheckVariableDeclaration(NewVD, PrevDecl, Redeclaration); 1839 1840 // If this is a locally-scoped extern C variable, update the map of 1841 // such variables. 1842 if (CurContext->isFunctionOrMethod() && NewVD->isExternC(Context) && 1843 !NewVD->isInvalidDecl()) 1844 RegisterLocallyScopedExternCDecl(NewVD, PrevDecl, S); 1845 1846 return NewVD; 1847} 1848 1849/// \brief Perform semantic checking on a newly-created variable 1850/// declaration. 1851/// 1852/// This routine performs all of the type-checking required for a 1853/// variable declaration once it has been built. It is used both to 1854/// check variables after they have been parsed and their declarators 1855/// have been translated into a declaration, and to check variables 1856/// that have been instantiated from a template. 1857/// 1858/// Sets NewVD->isInvalidDecl() if an error was encountered. 1859void Sema::CheckVariableDeclaration(VarDecl *NewVD, NamedDecl *PrevDecl, 1860 bool &Redeclaration) { 1861 // If the decl is already known invalid, don't check it. 1862 if (NewVD->isInvalidDecl()) 1863 return; 1864 1865 QualType T = NewVD->getType(); 1866 1867 if (T->isObjCInterfaceType()) { 1868 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 1869 return NewVD->setInvalidDecl(); 1870 } 1871 1872 // The variable can not have an abstract class type. 1873 if (RequireNonAbstractType(NewVD->getLocation(), T, 1874 diag::err_abstract_type_in_decl, 1875 AbstractVariableType)) 1876 return NewVD->setInvalidDecl(); 1877 1878 // Emit an error if an address space was applied to decl with local storage. 1879 // This includes arrays of objects with address space qualifiers, but not 1880 // automatic variables that point to other address spaces. 1881 // ISO/IEC TR 18037 S5.1.2 1882 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 1883 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 1884 return NewVD->setInvalidDecl(); 1885 } 1886 1887 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 1888 && !NewVD->hasAttr<BlocksAttr>()) 1889 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 1890 1891 bool isVM = T->isVariablyModifiedType(); 1892 if (isVM || NewVD->hasAttr<CleanupAttr>()) 1893 CurFunctionNeedsScopeChecking = true; 1894 1895 if ((isVM && NewVD->hasLinkage()) || 1896 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 1897 bool SizeIsNegative; 1898 QualType FixedTy = 1899 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1900 1901 if (FixedTy.isNull() && T->isVariableArrayType()) { 1902 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 1903 // FIXME: This won't give the correct result for 1904 // int a[10][n]; 1905 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 1906 1907 if (NewVD->isFileVarDecl()) 1908 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 1909 << SizeRange; 1910 else if (NewVD->getStorageClass() == VarDecl::Static) 1911 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 1912 << SizeRange; 1913 else 1914 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 1915 << SizeRange; 1916 return NewVD->setInvalidDecl(); 1917 } 1918 1919 if (FixedTy.isNull()) { 1920 if (NewVD->isFileVarDecl()) 1921 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 1922 else 1923 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 1924 return NewVD->setInvalidDecl(); 1925 } 1926 1927 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 1928 NewVD->setType(FixedTy); 1929 } 1930 1931 if (!PrevDecl && NewVD->isExternC(Context)) { 1932 // Since we did not find anything by this name and we're declaring 1933 // an extern "C" variable, look for a non-visible extern "C" 1934 // declaration with the same name. 1935 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 1936 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 1937 if (Pos != LocallyScopedExternalDecls.end()) 1938 PrevDecl = Pos->second; 1939 } 1940 1941 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 1942 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 1943 << T; 1944 return NewVD->setInvalidDecl(); 1945 } 1946 1947 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 1948 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 1949 return NewVD->setInvalidDecl(); 1950 } 1951 1952 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 1953 Diag(NewVD->getLocation(), diag::err_block_on_vm); 1954 return NewVD->setInvalidDecl(); 1955 } 1956 1957 if (PrevDecl) { 1958 Redeclaration = true; 1959 MergeVarDecl(NewVD, PrevDecl); 1960 } 1961} 1962 1963NamedDecl* 1964Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1965 QualType R, NamedDecl* PrevDecl, 1966 bool IsFunctionDefinition, bool &Redeclaration) { 1967 assert(R.getTypePtr()->isFunctionType()); 1968 1969 DeclarationName Name = GetNameForDeclarator(D); 1970 FunctionDecl::StorageClass SC = FunctionDecl::None; 1971 switch (D.getDeclSpec().getStorageClassSpec()) { 1972 default: assert(0 && "Unknown storage class!"); 1973 case DeclSpec::SCS_auto: 1974 case DeclSpec::SCS_register: 1975 case DeclSpec::SCS_mutable: 1976 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1977 diag::err_typecheck_sclass_func); 1978 D.setInvalidType(); 1979 break; 1980 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 1981 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 1982 case DeclSpec::SCS_static: { 1983 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 1984 // C99 6.7.1p5: 1985 // The declaration of an identifier for a function that has 1986 // block scope shall have no explicit storage-class specifier 1987 // other than extern 1988 // See also (C++ [dcl.stc]p4). 1989 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1990 diag::err_static_block_func); 1991 SC = FunctionDecl::None; 1992 } else 1993 SC = FunctionDecl::Static; 1994 break; 1995 } 1996 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 1997 } 1998 1999 if (D.getDeclSpec().isThreadSpecified()) 2000 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2001 2002 bool isInline = D.getDeclSpec().isInlineSpecified(); 2003 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2004 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2005 2006 // Check that the return type is not an abstract class type. 2007 // For record types, this is done by the AbstractClassUsageDiagnoser once 2008 // the class has been completely parsed. 2009 if (!DC->isRecord() && 2010 RequireNonAbstractType(D.getIdentifierLoc(), 2011 R->getAsFunctionType()->getResultType(), 2012 diag::err_abstract_type_in_decl, 2013 AbstractReturnType)) 2014 D.setInvalidType(); 2015 2016 // Do not allow returning a objc interface by-value. 2017 if (R->getAsFunctionType()->getResultType()->isObjCInterfaceType()) { 2018 Diag(D.getIdentifierLoc(), 2019 diag::err_object_cannot_be_passed_returned_by_value) << 0 2020 << R->getAsFunctionType()->getResultType(); 2021 D.setInvalidType(); 2022 } 2023 2024 bool isVirtualOkay = false; 2025 FunctionDecl *NewFD; 2026 if (D.getKind() == Declarator::DK_Constructor) { 2027 // This is a C++ constructor declaration. 2028 assert(DC->isRecord() && 2029 "Constructors can only be declared in a member context"); 2030 2031 R = CheckConstructorDeclarator(D, R, SC); 2032 2033 // Create the new declaration 2034 NewFD = CXXConstructorDecl::Create(Context, 2035 cast<CXXRecordDecl>(DC), 2036 D.getIdentifierLoc(), Name, R, 2037 isExplicit, isInline, 2038 /*isImplicitlyDeclared=*/false); 2039 } else if (D.getKind() == Declarator::DK_Destructor) { 2040 // This is a C++ destructor declaration. 2041 if (DC->isRecord()) { 2042 R = CheckDestructorDeclarator(D, SC); 2043 2044 NewFD = CXXDestructorDecl::Create(Context, 2045 cast<CXXRecordDecl>(DC), 2046 D.getIdentifierLoc(), Name, R, 2047 isInline, 2048 /*isImplicitlyDeclared=*/false); 2049 2050 isVirtualOkay = true; 2051 } else { 2052 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2053 2054 // Create a FunctionDecl to satisfy the function definition parsing 2055 // code path. 2056 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2057 Name, R, SC, isInline, 2058 /*hasPrototype=*/true, 2059 // FIXME: Move to DeclGroup... 2060 D.getDeclSpec().getSourceRange().getBegin()); 2061 D.setInvalidType(); 2062 } 2063 } else if (D.getKind() == Declarator::DK_Conversion) { 2064 if (!DC->isRecord()) { 2065 Diag(D.getIdentifierLoc(), 2066 diag::err_conv_function_not_member); 2067 return 0; 2068 } 2069 2070 CheckConversionDeclarator(D, R, SC); 2071 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2072 D.getIdentifierLoc(), Name, R, 2073 isInline, isExplicit); 2074 2075 isVirtualOkay = true; 2076 } else if (DC->isRecord()) { 2077 // If the of the function is the same as the name of the record, then this 2078 // must be an invalid constructor that has a return type. 2079 // (The parser checks for a return type and makes the declarator a 2080 // constructor if it has no return type). 2081 // must have an invalid constructor that has a return type 2082 if (Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2083 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2084 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2085 << SourceRange(D.getIdentifierLoc()); 2086 return 0; 2087 } 2088 2089 // This is a C++ method declaration. 2090 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2091 D.getIdentifierLoc(), Name, R, 2092 (SC == FunctionDecl::Static), isInline); 2093 2094 isVirtualOkay = (SC != FunctionDecl::Static); 2095 } else { 2096 // Determine whether the function was written with a 2097 // prototype. This true when: 2098 // - we're in C++ (where every function has a prototype), 2099 // - there is a prototype in the declarator, or 2100 // - the type R of the function is some kind of typedef or other reference 2101 // to a type name (which eventually refers to a function type). 2102 bool HasPrototype = 2103 getLangOptions().CPlusPlus || 2104 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2105 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2106 2107 NewFD = FunctionDecl::Create(Context, DC, 2108 D.getIdentifierLoc(), 2109 Name, R, SC, isInline, HasPrototype, 2110 // FIXME: Move to DeclGroup... 2111 D.getDeclSpec().getSourceRange().getBegin()); 2112 } 2113 2114 if (D.isInvalidType()) 2115 NewFD->setInvalidDecl(); 2116 2117 // Set the lexical context. If the declarator has a C++ 2118 // scope specifier, the lexical context will be different 2119 // from the semantic context. 2120 NewFD->setLexicalDeclContext(CurContext); 2121 2122 // C++ [dcl.fct.spec]p5: 2123 // The virtual specifier shall only be used in declarations of 2124 // nonstatic class member functions that appear within a 2125 // member-specification of a class declaration; see 10.3. 2126 // 2127 if (isVirtual && !NewFD->isInvalidDecl()) { 2128 if (!isVirtualOkay) { 2129 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2130 diag::err_virtual_non_function); 2131 } else if (!CurContext->isRecord()) { 2132 // 'virtual' was specified outside of the class. 2133 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2134 << CodeModificationHint::CreateRemoval( 2135 SourceRange(D.getDeclSpec().getVirtualSpecLoc())); 2136 } else { 2137 // Okay: Add virtual to the method. 2138 cast<CXXMethodDecl>(NewFD)->setVirtualAsWritten(true); 2139 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2140 CurClass->setAggregate(false); 2141 CurClass->setPOD(false); 2142 CurClass->setPolymorphic(true); 2143 CurClass->setHasTrivialConstructor(false); 2144 } 2145 } 2146 2147 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) { 2148 // Look for virtual methods in base classes that this method might override. 2149 2150 BasePaths Paths; 2151 if (LookupInBases(cast<CXXRecordDecl>(DC), 2152 MemberLookupCriteria(NewMD), Paths)) { 2153 for (BasePaths::decl_iterator I = Paths.found_decls_begin(), 2154 E = Paths.found_decls_end(); I != E; ++I) { 2155 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2156 if (!CheckOverridingFunctionReturnType(NewMD, OldMD)) 2157 NewMD->addOverriddenMethod(OldMD); 2158 } 2159 } 2160 } 2161 } 2162 2163 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 2164 !CurContext->isRecord()) { 2165 // C++ [class.static]p1: 2166 // A data or function member of a class may be declared static 2167 // in a class definition, in which case it is a static member of 2168 // the class. 2169 2170 // Complain about the 'static' specifier if it's on an out-of-line 2171 // member function definition. 2172 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2173 diag::err_static_out_of_line) 2174 << CodeModificationHint::CreateRemoval( 2175 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 2176 } 2177 2178 // Handle GNU asm-label extension (encoded as an attribute). 2179 if (Expr *E = (Expr*) D.getAsmLabel()) { 2180 // The parser guarantees this is a string. 2181 StringLiteral *SE = cast<StringLiteral>(E); 2182 NewFD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 2183 SE->getByteLength()))); 2184 } 2185 2186 // Copy the parameter declarations from the declarator D to the function 2187 // declaration NewFD, if they are available. First scavenge them into Params. 2188 llvm::SmallVector<ParmVarDecl*, 16> Params; 2189 if (D.getNumTypeObjects() > 0) { 2190 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2191 2192 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 2193 // function that takes no arguments, not a function that takes a 2194 // single void argument. 2195 // We let through "const void" here because Sema::GetTypeForDeclarator 2196 // already checks for that case. 2197 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2198 FTI.ArgInfo[0].Param && 2199 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 2200 // Empty arg list, don't push any params. 2201 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 2202 2203 // In C++, the empty parameter-type-list must be spelled "void"; a 2204 // typedef of void is not permitted. 2205 if (getLangOptions().CPlusPlus && 2206 Param->getType().getUnqualifiedType() != Context.VoidTy) 2207 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 2208 // FIXME: Leaks decl? 2209 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 2210 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 2211 Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 2212 } 2213 2214 } else if (const FunctionProtoType *FT = R->getAsFunctionProtoType()) { 2215 // When we're declaring a function with a typedef, typeof, etc as in the 2216 // following example, we'll need to synthesize (unnamed) 2217 // parameters for use in the declaration. 2218 // 2219 // @code 2220 // typedef void fn(int); 2221 // fn f; 2222 // @endcode 2223 2224 // Synthesize a parameter for each argument type. 2225 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 2226 AE = FT->arg_type_end(); AI != AE; ++AI) { 2227 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, 2228 SourceLocation(), 0, 2229 *AI, VarDecl::None, 0); 2230 Param->setImplicit(); 2231 Params.push_back(Param); 2232 } 2233 } else { 2234 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 2235 "Should not need args for typedef of non-prototype fn"); 2236 } 2237 // Finally, we know we have the right number of parameters, install them. 2238 NewFD->setParams(Context, Params.data(), Params.size()); 2239 2240 2241 2242 // If name lookup finds a previous declaration that is not in the 2243 // same scope as the new declaration, this may still be an 2244 // acceptable redeclaration. 2245 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 2246 !(NewFD->hasLinkage() && 2247 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 2248 PrevDecl = 0; 2249 2250 // Perform semantic checking on the function declaration. 2251 bool OverloadableAttrRequired = false; // FIXME: HACK! 2252 CheckFunctionDeclaration(NewFD, PrevDecl, Redeclaration, 2253 /*FIXME:*/OverloadableAttrRequired); 2254 2255 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 2256 // An out-of-line member function declaration must also be a 2257 // definition (C++ [dcl.meaning]p1). 2258 if (!IsFunctionDefinition) { 2259 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2260 << D.getCXXScopeSpec().getRange(); 2261 NewFD->setInvalidDecl(); 2262 } else if (!Redeclaration) { 2263 // The user tried to provide an out-of-line definition for a 2264 // function that is a member of a class or namespace, but there 2265 // was no such member function declared (C++ [class.mfct]p2, 2266 // C++ [namespace.memdef]p2). For example: 2267 // 2268 // class X { 2269 // void f() const; 2270 // }; 2271 // 2272 // void X::f() { } // ill-formed 2273 // 2274 // Complain about this problem, and attempt to suggest close 2275 // matches (e.g., those that differ only in cv-qualifiers and 2276 // whether the parameter types are references). 2277 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 2278 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 2279 NewFD->setInvalidDecl(); 2280 2281 LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 2282 true); 2283 assert(!Prev.isAmbiguous() && 2284 "Cannot have an ambiguity in previous-declaration lookup"); 2285 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 2286 Func != FuncEnd; ++Func) { 2287 if (isa<FunctionDecl>(*Func) && 2288 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 2289 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 2290 } 2291 2292 PrevDecl = 0; 2293 } 2294 } 2295 2296 // Handle attributes. We need to have merged decls when handling attributes 2297 // (for example to check for conflicts, etc). 2298 // FIXME: This needs to happen before we merge declarations. Then, 2299 // let attribute merging cope with attribute conflicts. 2300 ProcessDeclAttributes(NewFD, D); 2301 AddKnownFunctionAttributes(NewFD); 2302 2303 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 2304 // If a function name is overloadable in C, then every function 2305 // with that name must be marked "overloadable". 2306 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 2307 << Redeclaration << NewFD; 2308 if (PrevDecl) 2309 Diag(PrevDecl->getLocation(), 2310 diag::note_attribute_overloadable_prev_overload); 2311 NewFD->addAttr(::new (Context) OverloadableAttr()); 2312 } 2313 2314 // If this is a locally-scoped extern C function, update the 2315 // map of such names. 2316 if (CurContext->isFunctionOrMethod() && NewFD->isExternC(Context) 2317 && !NewFD->isInvalidDecl()) 2318 RegisterLocallyScopedExternCDecl(NewFD, PrevDecl, S); 2319 2320 return NewFD; 2321} 2322 2323/// \brief Perform semantic checking of a new function declaration. 2324/// 2325/// Performs semantic analysis of the new function declaration 2326/// NewFD. This routine performs all semantic checking that does not 2327/// require the actual declarator involved in the declaration, and is 2328/// used both for the declaration of functions as they are parsed 2329/// (called via ActOnDeclarator) and for the declaration of functions 2330/// that have been instantiated via C++ template instantiation (called 2331/// via InstantiateDecl). 2332/// 2333/// This sets NewFD->isInvalidDecl() to true if there was an error. 2334void Sema::CheckFunctionDeclaration(FunctionDecl *NewFD, NamedDecl *&PrevDecl, 2335 bool &Redeclaration, 2336 bool &OverloadableAttrRequired) { 2337 // If NewFD is already known erroneous, don't do any of this checking. 2338 if (NewFD->isInvalidDecl()) 2339 return; 2340 2341 if (NewFD->getResultType()->isVariablyModifiedType()) { 2342 // Functions returning a variably modified type violate C99 6.7.5.2p2 2343 // because all functions have linkage. 2344 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 2345 return NewFD->setInvalidDecl(); 2346 } 2347 2348 // Semantic checking for this function declaration (in isolation). 2349 if (getLangOptions().CPlusPlus) { 2350 // C++-specific checks. 2351 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 2352 CheckConstructor(Constructor); 2353 } else if (isa<CXXDestructorDecl>(NewFD)) { 2354 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 2355 Record->setUserDeclaredDestructor(true); 2356 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 2357 // user-defined destructor. 2358 Record->setPOD(false); 2359 2360 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 2361 // declared destructor. 2362 Record->setHasTrivialDestructor(false); 2363 } else if (CXXConversionDecl *Conversion 2364 = dyn_cast<CXXConversionDecl>(NewFD)) 2365 ActOnConversionDeclarator(Conversion); 2366 2367 // Extra checking for C++ overloaded operators (C++ [over.oper]). 2368 if (NewFD->isOverloadedOperator() && 2369 CheckOverloadedOperatorDeclaration(NewFD)) 2370 return NewFD->setInvalidDecl(); 2371 } 2372 2373 // C99 6.7.4p6: 2374 // [... ] For a function with external linkage, the following 2375 // restrictions apply: [...] If all of the file scope declarations 2376 // for a function in a translation unit include the inline 2377 // function specifier without extern, then the definition in that 2378 // translation unit is an inline definition. An inline definition 2379 // does not provide an external definition for the function, and 2380 // does not forbid an external definition in another translation 2381 // unit. 2382 // 2383 // Here we determine whether this function, in isolation, would be a 2384 // C99 inline definition. MergeCompatibleFunctionDecls looks at 2385 // previous declarations. 2386 if (NewFD->isInline() && getLangOptions().C99 && 2387 NewFD->getStorageClass() == FunctionDecl::None && 2388 NewFD->getDeclContext()->getLookupContext()->isTranslationUnit()) 2389 NewFD->setC99InlineDefinition(true); 2390 2391 // Check for a previous declaration of this name. 2392 if (!PrevDecl && NewFD->isExternC(Context)) { 2393 // Since we did not find anything by this name and we're declaring 2394 // an extern "C" function, look for a non-visible extern "C" 2395 // declaration with the same name. 2396 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2397 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 2398 if (Pos != LocallyScopedExternalDecls.end()) 2399 PrevDecl = Pos->second; 2400 } 2401 2402 // Merge or overload the declaration with an existing declaration of 2403 // the same name, if appropriate. 2404 if (PrevDecl) { 2405 // Determine whether NewFD is an overload of PrevDecl or 2406 // a declaration that requires merging. If it's an overload, 2407 // there's no more work to do here; we'll just add the new 2408 // function to the scope. 2409 OverloadedFunctionDecl::function_iterator MatchedDecl; 2410 2411 if (!getLangOptions().CPlusPlus && 2412 AllowOverloadingOfFunction(PrevDecl, Context)) { 2413 OverloadableAttrRequired = true; 2414 2415 // Functions marked "overloadable" must have a prototype (that 2416 // we can't get through declaration merging). 2417 if (!NewFD->getType()->getAsFunctionProtoType()) { 2418 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_no_prototype) 2419 << NewFD; 2420 Redeclaration = true; 2421 2422 // Turn this into a variadic function with no parameters. 2423 QualType R = Context.getFunctionType( 2424 NewFD->getType()->getAsFunctionType()->getResultType(), 2425 0, 0, true, 0); 2426 NewFD->setType(R); 2427 return NewFD->setInvalidDecl(); 2428 } 2429 } 2430 2431 if (PrevDecl && 2432 (!AllowOverloadingOfFunction(PrevDecl, Context) || 2433 !IsOverload(NewFD, PrevDecl, MatchedDecl))) { 2434 Redeclaration = true; 2435 Decl *OldDecl = PrevDecl; 2436 2437 // If PrevDecl was an overloaded function, extract the 2438 // FunctionDecl that matched. 2439 if (isa<OverloadedFunctionDecl>(PrevDecl)) 2440 OldDecl = *MatchedDecl; 2441 2442 // NewFD and OldDecl represent declarations that need to be 2443 // merged. 2444 if (MergeFunctionDecl(NewFD, OldDecl)) 2445 return NewFD->setInvalidDecl(); 2446 2447 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 2448 } 2449 } 2450 2451 // In C++, check default arguments now that we have merged decls. Unless 2452 // the lexical context is the class, because in this case this is done 2453 // during delayed parsing anyway. 2454 if (getLangOptions().CPlusPlus && !CurContext->isRecord()) 2455 CheckCXXDefaultArguments(NewFD); 2456} 2457 2458bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 2459 // FIXME: Need strict checking. In C89, we need to check for 2460 // any assignment, increment, decrement, function-calls, or 2461 // commas outside of a sizeof. In C99, it's the same list, 2462 // except that the aforementioned are allowed in unevaluated 2463 // expressions. Everything else falls under the 2464 // "may accept other forms of constant expressions" exception. 2465 // (We never end up here for C++, so the constant expression 2466 // rules there don't matter.) 2467 if (Init->isConstantInitializer(Context)) 2468 return false; 2469 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 2470 << Init->getSourceRange(); 2471 return true; 2472} 2473 2474void Sema::AddInitializerToDecl(DeclPtrTy dcl, FullExprArg init) { 2475 AddInitializerToDecl(dcl, init.release(), /*DirectInit=*/false); 2476} 2477 2478/// AddInitializerToDecl - Adds the initializer Init to the 2479/// declaration dcl. If DirectInit is true, this is C++ direct 2480/// initialization rather than copy initialization. 2481void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 2482 Decl *RealDecl = dcl.getAs<Decl>(); 2483 // If there is no declaration, there was an error parsing it. Just ignore 2484 // the initializer. 2485 if (RealDecl == 0) 2486 return; 2487 2488 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 2489 // With declarators parsed the way they are, the parser cannot 2490 // distinguish between a normal initializer and a pure-specifier. 2491 // Thus this grotesque test. 2492 IntegerLiteral *IL; 2493 Expr *Init = static_cast<Expr *>(init.get()); 2494 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 2495 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 2496 if (Method->isVirtualAsWritten()) { 2497 Method->setPure(); 2498 2499 // A class is abstract if at least one function is pure virtual. 2500 cast<CXXRecordDecl>(CurContext)->setAbstract(true); 2501 } else if (!Method->isInvalidDecl()) { 2502 Diag(Method->getLocation(), diag::err_non_virtual_pure) 2503 << Method->getDeclName() << Init->getSourceRange(); 2504 Method->setInvalidDecl(); 2505 } 2506 } else { 2507 Diag(Method->getLocation(), diag::err_member_function_initialization) 2508 << Method->getDeclName() << Init->getSourceRange(); 2509 Method->setInvalidDecl(); 2510 } 2511 return; 2512 } 2513 2514 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2515 if (!VDecl) { 2516 if (getLangOptions().CPlusPlus && 2517 RealDecl->getLexicalDeclContext()->isRecord() && 2518 isa<NamedDecl>(RealDecl)) 2519 Diag(RealDecl->getLocation(), diag::err_member_initialization) 2520 << cast<NamedDecl>(RealDecl)->getDeclName(); 2521 else 2522 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2523 RealDecl->setInvalidDecl(); 2524 return; 2525 } 2526 2527 if (!VDecl->getType()->isArrayType() && 2528 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2529 diag::err_typecheck_decl_incomplete_type)) { 2530 RealDecl->setInvalidDecl(); 2531 return; 2532 } 2533 2534 const VarDecl *Def = 0; 2535 if (VDecl->getDefinition(Def)) { 2536 Diag(VDecl->getLocation(), diag::err_redefinition) 2537 << VDecl->getDeclName(); 2538 Diag(Def->getLocation(), diag::note_previous_definition); 2539 VDecl->setInvalidDecl(); 2540 return; 2541 } 2542 2543 // Take ownership of the expression, now that we're sure we have somewhere 2544 // to put it. 2545 Expr *Init = init.takeAs<Expr>(); 2546 assert(Init && "missing initializer"); 2547 2548 // Get the decls type and save a reference for later, since 2549 // CheckInitializerTypes may change it. 2550 QualType DclT = VDecl->getType(), SavT = DclT; 2551 if (VDecl->isBlockVarDecl()) { 2552 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 2553 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2554 VDecl->setInvalidDecl(); 2555 } else if (!VDecl->isInvalidDecl()) { 2556 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2557 VDecl->getDeclName(), DirectInit)) 2558 VDecl->setInvalidDecl(); 2559 2560 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2561 // Don't check invalid declarations to avoid emitting useless diagnostics. 2562 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2563 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 2564 CheckForConstantInitializer(Init, DclT); 2565 } 2566 } 2567 } else if (VDecl->isStaticDataMember() && 2568 VDecl->getLexicalDeclContext()->isRecord()) { 2569 // This is an in-class initialization for a static data member, e.g., 2570 // 2571 // struct S { 2572 // static const int value = 17; 2573 // }; 2574 2575 // Attach the initializer 2576 VDecl->setInit(Context, Init); 2577 2578 // C++ [class.mem]p4: 2579 // A member-declarator can contain a constant-initializer only 2580 // if it declares a static member (9.4) of const integral or 2581 // const enumeration type, see 9.4.2. 2582 QualType T = VDecl->getType(); 2583 if (!T->isDependentType() && 2584 (!Context.getCanonicalType(T).isConstQualified() || 2585 !T->isIntegralType())) { 2586 Diag(VDecl->getLocation(), diag::err_member_initialization) 2587 << VDecl->getDeclName() << Init->getSourceRange(); 2588 VDecl->setInvalidDecl(); 2589 } else { 2590 // C++ [class.static.data]p4: 2591 // If a static data member is of const integral or const 2592 // enumeration type, its declaration in the class definition 2593 // can specify a constant-initializer which shall be an 2594 // integral constant expression (5.19). 2595 if (!Init->isTypeDependent() && 2596 !Init->getType()->isIntegralType()) { 2597 // We have a non-dependent, non-integral or enumeration type. 2598 Diag(Init->getSourceRange().getBegin(), 2599 diag::err_in_class_initializer_non_integral_type) 2600 << Init->getType() << Init->getSourceRange(); 2601 VDecl->setInvalidDecl(); 2602 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 2603 // Check whether the expression is a constant expression. 2604 llvm::APSInt Value; 2605 SourceLocation Loc; 2606 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 2607 Diag(Loc, diag::err_in_class_initializer_non_constant) 2608 << Init->getSourceRange(); 2609 VDecl->setInvalidDecl(); 2610 } else if (!VDecl->getType()->isDependentType()) 2611 ImpCastExprToType(Init, VDecl->getType()); 2612 } 2613 } 2614 } else if (VDecl->isFileVarDecl()) { 2615 if (VDecl->getStorageClass() == VarDecl::Extern) 2616 Diag(VDecl->getLocation(), diag::warn_extern_init); 2617 if (!VDecl->isInvalidDecl()) 2618 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2619 VDecl->getDeclName(), DirectInit)) 2620 VDecl->setInvalidDecl(); 2621 2622 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2623 // Don't check invalid declarations to avoid emitting useless diagnostics. 2624 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2625 // C99 6.7.8p4. All file scoped initializers need to be constant. 2626 CheckForConstantInitializer(Init, DclT); 2627 } 2628 } 2629 // If the type changed, it means we had an incomplete type that was 2630 // completed by the initializer. For example: 2631 // int ary[] = { 1, 3, 5 }; 2632 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2633 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2634 VDecl->setType(DclT); 2635 Init->setType(DclT); 2636 } 2637 2638 // Attach the initializer to the decl. 2639 VDecl->setInit(Context, Init); 2640 2641 // If the previous declaration of VDecl was a tentative definition, 2642 // remove it from the set of tentative definitions. 2643 if (VDecl->getPreviousDeclaration() && 2644 VDecl->getPreviousDeclaration()->isTentativeDefinition(Context)) { 2645 llvm::DenseMap<DeclarationName, VarDecl *>::iterator Pos 2646 = TentativeDefinitions.find(VDecl->getDeclName()); 2647 assert(Pos != TentativeDefinitions.end() && 2648 "Unrecorded tentative definition?"); 2649 TentativeDefinitions.erase(Pos); 2650 } 2651 2652 return; 2653} 2654 2655void Sema::ActOnUninitializedDecl(DeclPtrTy dcl) { 2656 Decl *RealDecl = dcl.getAs<Decl>(); 2657 2658 // If there is no declaration, there was an error parsing it. Just ignore it. 2659 if (RealDecl == 0) 2660 return; 2661 2662 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2663 QualType Type = Var->getType(); 2664 2665 // Record tentative definitions. 2666 if (Var->isTentativeDefinition(Context)) 2667 TentativeDefinitions[Var->getDeclName()] = Var; 2668 2669 // C++ [dcl.init.ref]p3: 2670 // The initializer can be omitted for a reference only in a 2671 // parameter declaration (8.3.5), in the declaration of a 2672 // function return type, in the declaration of a class member 2673 // within its class declaration (9.2), and where the extern 2674 // specifier is explicitly used. 2675 if (Type->isReferenceType() && !Var->hasExternalStorage()) { 2676 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2677 << Var->getDeclName() 2678 << SourceRange(Var->getLocation(), Var->getLocation()); 2679 Var->setInvalidDecl(); 2680 return; 2681 } 2682 2683 // C++ [dcl.init]p9: 2684 // 2685 // If no initializer is specified for an object, and the object 2686 // is of (possibly cv-qualified) non-POD class type (or array 2687 // thereof), the object shall be default-initialized; if the 2688 // object is of const-qualified type, the underlying class type 2689 // shall have a user-declared default constructor. 2690 if (getLangOptions().CPlusPlus) { 2691 QualType InitType = Type; 2692 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2693 InitType = Array->getElementType(); 2694 if ((!Var->hasExternalStorage() && !Var->isExternC(Context)) && 2695 InitType->isRecordType() && !InitType->isDependentType()) { 2696 CXXRecordDecl *RD = 2697 cast<CXXRecordDecl>(InitType->getAsRecordType()->getDecl()); 2698 CXXConstructorDecl *Constructor = 0; 2699 if (!RequireCompleteType(Var->getLocation(), InitType, 2700 diag::err_invalid_incomplete_type_use)) 2701 Constructor 2702 = PerformInitializationByConstructor(InitType, 0, 0, 2703 Var->getLocation(), 2704 SourceRange(Var->getLocation(), 2705 Var->getLocation()), 2706 Var->getDeclName(), 2707 IK_Default); 2708 if (!Constructor) 2709 Var->setInvalidDecl(); 2710 else if (!RD->hasTrivialConstructor()) 2711 InitializeVarWithConstructor(Var, Constructor, InitType, 0, 0); 2712 } 2713 } 2714 2715#if 0 2716 // FIXME: Temporarily disabled because we are not properly parsing 2717 // linkage specifications on declarations, e.g., 2718 // 2719 // extern "C" const CGPoint CGPointerZero; 2720 // 2721 // C++ [dcl.init]p9: 2722 // 2723 // If no initializer is specified for an object, and the 2724 // object is of (possibly cv-qualified) non-POD class type (or 2725 // array thereof), the object shall be default-initialized; if 2726 // the object is of const-qualified type, the underlying class 2727 // type shall have a user-declared default 2728 // constructor. Otherwise, if no initializer is specified for 2729 // an object, the object and its subobjects, if any, have an 2730 // indeterminate initial value; if the object or any of its 2731 // subobjects are of const-qualified type, the program is 2732 // ill-formed. 2733 // 2734 // This isn't technically an error in C, so we don't diagnose it. 2735 // 2736 // FIXME: Actually perform the POD/user-defined default 2737 // constructor check. 2738 if (getLangOptions().CPlusPlus && 2739 Context.getCanonicalType(Type).isConstQualified() && 2740 !Var->hasExternalStorage()) 2741 Diag(Var->getLocation(), diag::err_const_var_requires_init) 2742 << Var->getName() 2743 << SourceRange(Var->getLocation(), Var->getLocation()); 2744#endif 2745 } 2746} 2747 2748Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 2749 DeclPtrTy *Group, 2750 unsigned NumDecls) { 2751 llvm::SmallVector<Decl*, 8> Decls; 2752 2753 if (DS.isTypeSpecOwned()) 2754 Decls.push_back((Decl*)DS.getTypeRep()); 2755 2756 for (unsigned i = 0; i != NumDecls; ++i) 2757 if (Decl *D = Group[i].getAs<Decl>()) 2758 Decls.push_back(D); 2759 2760 // Perform semantic analysis that depends on having fully processed both 2761 // the declarator and initializer. 2762 for (unsigned i = 0, e = Decls.size(); i != e; ++i) { 2763 VarDecl *IDecl = dyn_cast<VarDecl>(Decls[i]); 2764 if (!IDecl) 2765 continue; 2766 QualType T = IDecl->getType(); 2767 2768 // Block scope. C99 6.7p7: If an identifier for an object is declared with 2769 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 2770 if (IDecl->isBlockVarDecl() && !IDecl->hasExternalStorage()) { 2771 if (!IDecl->isInvalidDecl() && 2772 RequireCompleteType(IDecl->getLocation(), T, 2773 diag::err_typecheck_decl_incomplete_type)) 2774 IDecl->setInvalidDecl(); 2775 } 2776 // File scope. C99 6.9.2p2: A declaration of an identifier for and 2777 // object that has file scope without an initializer, and without a 2778 // storage-class specifier or with the storage-class specifier "static", 2779 // constitutes a tentative definition. Note: A tentative definition with 2780 // external linkage is valid (C99 6.2.2p5). 2781 if (IDecl->isTentativeDefinition(Context)) { 2782 QualType CheckType = T; 2783 unsigned DiagID = diag::err_typecheck_decl_incomplete_type; 2784 2785 const IncompleteArrayType *ArrayT = Context.getAsIncompleteArrayType(T); 2786 if (ArrayT) { 2787 CheckType = ArrayT->getElementType(); 2788 DiagID = diag::err_illegal_decl_array_incomplete_type; 2789 } 2790 2791 if (IDecl->isInvalidDecl()) { 2792 // Do nothing with invalid declarations 2793 } else if ((ArrayT || IDecl->getStorageClass() == VarDecl::Static) && 2794 RequireCompleteType(IDecl->getLocation(), CheckType, DiagID)) { 2795 // C99 6.9.2p3: If the declaration of an identifier for an object is 2796 // a tentative definition and has internal linkage (C99 6.2.2p3), the 2797 // declared type shall not be an incomplete type. 2798 IDecl->setInvalidDecl(); 2799 } 2800 } 2801 } 2802 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 2803 Decls.data(), Decls.size())); 2804} 2805 2806 2807/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 2808/// to introduce parameters into function prototype scope. 2809Sema::DeclPtrTy 2810Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 2811 const DeclSpec &DS = D.getDeclSpec(); 2812 2813 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 2814 VarDecl::StorageClass StorageClass = VarDecl::None; 2815 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2816 StorageClass = VarDecl::Register; 2817 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2818 Diag(DS.getStorageClassSpecLoc(), 2819 diag::err_invalid_storage_class_in_func_decl); 2820 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2821 } 2822 2823 if (D.getDeclSpec().isThreadSpecified()) 2824 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2825 2826 DiagnoseFunctionSpecifiers(D); 2827 2828 // Check that there are no default arguments inside the type of this 2829 // parameter (C++ only). 2830 if (getLangOptions().CPlusPlus) 2831 CheckExtraCXXDefaultArguments(D); 2832 2833 TagDecl *OwnedDecl = 0; 2834 QualType parmDeclType = GetTypeForDeclarator(D, S, /*Skip=*/0, &OwnedDecl); 2835 2836 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 2837 // C++ [dcl.fct]p6: 2838 // Types shall not be defined in return or parameter types. 2839 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 2840 << Context.getTypeDeclType(OwnedDecl); 2841 } 2842 2843 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 2844 // Can this happen for params? We already checked that they don't conflict 2845 // among each other. Here they can only shadow globals, which is ok. 2846 IdentifierInfo *II = D.getIdentifier(); 2847 if (II) { 2848 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2849 if (PrevDecl->isTemplateParameter()) { 2850 // Maybe we will complain about the shadowed template parameter. 2851 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2852 // Just pretend that we didn't see the previous declaration. 2853 PrevDecl = 0; 2854 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 2855 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 2856 2857 // Recover by removing the name 2858 II = 0; 2859 D.SetIdentifier(0, D.getIdentifierLoc()); 2860 } 2861 } 2862 } 2863 2864 // Parameters can not be abstract class types. 2865 // For record types, this is done by the AbstractClassUsageDiagnoser once 2866 // the class has been completely parsed. 2867 if (!CurContext->isRecord() && 2868 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 2869 diag::err_abstract_type_in_decl, 2870 AbstractParamType)) 2871 D.setInvalidType(true); 2872 2873 QualType T = adjustParameterType(parmDeclType); 2874 2875 ParmVarDecl *New; 2876 if (T == parmDeclType) // parameter type did not need adjustment 2877 New = ParmVarDecl::Create(Context, CurContext, 2878 D.getIdentifierLoc(), II, 2879 parmDeclType, StorageClass, 2880 0); 2881 else // keep track of both the adjusted and unadjusted types 2882 New = OriginalParmVarDecl::Create(Context, CurContext, 2883 D.getIdentifierLoc(), II, T, 2884 parmDeclType, StorageClass, 0); 2885 2886 if (D.isInvalidType()) 2887 New->setInvalidDecl(); 2888 2889 // Parameter declarators cannot be interface types. All ObjC objects are 2890 // passed by reference. 2891 if (T->isObjCInterfaceType()) { 2892 Diag(D.getIdentifierLoc(), 2893 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 2894 New->setInvalidDecl(); 2895 } 2896 2897 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 2898 if (D.getCXXScopeSpec().isSet()) { 2899 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 2900 << D.getCXXScopeSpec().getRange(); 2901 New->setInvalidDecl(); 2902 } 2903 2904 // Add the parameter declaration into this scope. 2905 S->AddDecl(DeclPtrTy::make(New)); 2906 if (II) 2907 IdResolver.AddDecl(New); 2908 2909 ProcessDeclAttributes(New, D); 2910 2911 if (New->hasAttr<BlocksAttr>()) { 2912 Diag(New->getLocation(), diag::err_block_on_nonlocal); 2913 } 2914 return DeclPtrTy::make(New); 2915} 2916 2917void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 2918 SourceLocation LocAfterDecls) { 2919 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2920 "Not a function declarator!"); 2921 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2922 2923 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 2924 // for a K&R function. 2925 if (!FTI.hasPrototype) { 2926 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 2927 --i; 2928 if (FTI.ArgInfo[i].Param == 0) { 2929 std::string Code = " int "; 2930 Code += FTI.ArgInfo[i].Ident->getName(); 2931 Code += ";\n"; 2932 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 2933 << FTI.ArgInfo[i].Ident 2934 << CodeModificationHint::CreateInsertion(LocAfterDecls, Code); 2935 2936 // Implicitly declare the argument as type 'int' for lack of a better 2937 // type. 2938 DeclSpec DS; 2939 const char* PrevSpec; // unused 2940 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 2941 PrevSpec); 2942 Declarator ParamD(DS, Declarator::KNRTypeListContext); 2943 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 2944 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 2945 } 2946 } 2947 } 2948} 2949 2950Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 2951 Declarator &D) { 2952 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 2953 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2954 "Not a function declarator!"); 2955 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2956 2957 if (FTI.hasPrototype) { 2958 // FIXME: Diagnose arguments without names in C. 2959 } 2960 2961 Scope *ParentScope = FnBodyScope->getParent(); 2962 2963 DeclPtrTy DP = ActOnDeclarator(ParentScope, D, /*IsFunctionDefinition=*/true); 2964 return ActOnStartOfFunctionDef(FnBodyScope, DP); 2965} 2966 2967Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 2968 FunctionDecl *FD = cast<FunctionDecl>(D.getAs<Decl>()); 2969 2970 CurFunctionNeedsScopeChecking = false; 2971 2972 // See if this is a redefinition. 2973 const FunctionDecl *Definition; 2974 if (FD->getBody(Context, Definition)) { 2975 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 2976 Diag(Definition->getLocation(), diag::note_previous_definition); 2977 } 2978 2979 // Builtin functions cannot be defined. 2980 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 2981 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2982 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 2983 FD->setInvalidDecl(); 2984 } 2985 } 2986 2987 // The return type of a function definition must be complete 2988 // (C99 6.9.1p3, C++ [dcl.fct]p6). 2989 QualType ResultType = FD->getResultType(); 2990 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 2991 !FD->isInvalidDecl() && 2992 RequireCompleteType(FD->getLocation(), ResultType, 2993 diag::err_func_def_incomplete_result)) 2994 FD->setInvalidDecl(); 2995 2996 // GNU warning -Wmissing-prototypes: 2997 // Warn if a global function is defined without a previous 2998 // prototype declaration. This warning is issued even if the 2999 // definition itself provides a prototype. The aim is to detect 3000 // global functions that fail to be declared in header files. 3001 if (!FD->isInvalidDecl() && FD->isGlobal() && !isa<CXXMethodDecl>(FD) && 3002 !FD->isMain()) { 3003 bool MissingPrototype = true; 3004 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 3005 Prev; Prev = Prev->getPreviousDeclaration()) { 3006 // Ignore any declarations that occur in function or method 3007 // scope, because they aren't visible from the header. 3008 if (Prev->getDeclContext()->isFunctionOrMethod()) 3009 continue; 3010 3011 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 3012 break; 3013 } 3014 3015 if (MissingPrototype) 3016 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 3017 } 3018 3019 if (FnBodyScope) 3020 PushDeclContext(FnBodyScope, FD); 3021 3022 // Check the validity of our function parameters 3023 CheckParmsForFunctionDef(FD); 3024 3025 // Introduce our parameters into the function scope 3026 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 3027 ParmVarDecl *Param = FD->getParamDecl(p); 3028 Param->setOwningFunction(FD); 3029 3030 // If this has an identifier, add it to the scope stack. 3031 if (Param->getIdentifier() && FnBodyScope) 3032 PushOnScopeChains(Param, FnBodyScope); 3033 } 3034 3035 // Checking attributes of current function definition 3036 // dllimport attribute. 3037 if (FD->getAttr<DLLImportAttr>() && (!FD->getAttr<DLLExportAttr>())) { 3038 // dllimport attribute cannot be applied to definition. 3039 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 3040 Diag(FD->getLocation(), 3041 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 3042 << "dllimport"; 3043 FD->setInvalidDecl(); 3044 return DeclPtrTy::make(FD); 3045 } else { 3046 // If a symbol previously declared dllimport is later defined, the 3047 // attribute is ignored in subsequent references, and a warning is 3048 // emitted. 3049 Diag(FD->getLocation(), 3050 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 3051 << FD->getNameAsCString() << "dllimport"; 3052 } 3053 } 3054 return DeclPtrTy::make(FD); 3055} 3056 3057Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 3058 return ActOnFinishFunctionBody(D, move(BodyArg), false); 3059} 3060 3061Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 3062 bool IsInstantiation) { 3063 Decl *dcl = D.getAs<Decl>(); 3064 Stmt *Body = BodyArg.takeAs<Stmt>(); 3065 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 3066 FD->setBody(Body); 3067 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 3068 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 3069 assert(MD == getCurMethodDecl() && "Method parsing confused"); 3070 MD->setBody(Body); 3071 } else { 3072 Body->Destroy(Context); 3073 return DeclPtrTy(); 3074 } 3075 if (!IsInstantiation) 3076 PopDeclContext(); 3077 3078 // Verify and clean out per-function state. 3079 3080 assert(&getLabelMap() == &FunctionLabelMap && "Didn't pop block right?"); 3081 3082 // Check goto/label use. 3083 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 3084 I = FunctionLabelMap.begin(), E = FunctionLabelMap.end(); I != E; ++I) { 3085 LabelStmt *L = I->second; 3086 3087 // Verify that we have no forward references left. If so, there was a goto 3088 // or address of a label taken, but no definition of it. Label fwd 3089 // definitions are indicated with a null substmt. 3090 if (L->getSubStmt() != 0) 3091 continue; 3092 3093 // Emit error. 3094 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 3095 3096 // At this point, we have gotos that use the bogus label. Stitch it into 3097 // the function body so that they aren't leaked and that the AST is well 3098 // formed. 3099 if (Body == 0) { 3100 // The whole function wasn't parsed correctly, just delete this. 3101 L->Destroy(Context); 3102 continue; 3103 } 3104 3105 // Otherwise, the body is valid: we want to stitch the label decl into the 3106 // function somewhere so that it is properly owned and so that the goto 3107 // has a valid target. Do this by creating a new compound stmt with the 3108 // label in it. 3109 3110 // Give the label a sub-statement. 3111 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 3112 3113 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 3114 cast<CXXTryStmt>(Body)->getTryBlock() : 3115 cast<CompoundStmt>(Body); 3116 std::vector<Stmt*> Elements(Compound->body_begin(), Compound->body_end()); 3117 Elements.push_back(L); 3118 Compound->setStmts(Context, &Elements[0], Elements.size()); 3119 } 3120 FunctionLabelMap.clear(); 3121 3122 if (!Body) return D; 3123 3124 // Verify that that gotos and switch cases don't jump into scopes illegally. 3125 if (CurFunctionNeedsScopeChecking) 3126 DiagnoseInvalidJumps(Body); 3127 3128 // C++ constructors that have function-try-blocks can't have return statements 3129 // in the handlers of that block. (C++ [except.handle]p14) Verify this. 3130 if (isa<CXXConstructorDecl>(dcl) && isa<CXXTryStmt>(Body)) 3131 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 3132 3133 return D; 3134} 3135 3136/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 3137/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 3138NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 3139 IdentifierInfo &II, Scope *S) { 3140 // Before we produce a declaration for an implicitly defined 3141 // function, see whether there was a locally-scoped declaration of 3142 // this name as a function or variable. If so, use that 3143 // (non-visible) declaration, and complain about it. 3144 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3145 = LocallyScopedExternalDecls.find(&II); 3146 if (Pos != LocallyScopedExternalDecls.end()) { 3147 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 3148 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 3149 return Pos->second; 3150 } 3151 3152 // Extension in C99. Legal in C90, but warn about it. 3153 if (getLangOptions().C99) 3154 Diag(Loc, diag::ext_implicit_function_decl) << &II; 3155 else 3156 Diag(Loc, diag::warn_implicit_function_decl) << &II; 3157 3158 // FIXME: handle stuff like: 3159 // void foo() { extern float X(); } 3160 // void bar() { X(); } <-- implicit decl for X in another scope. 3161 3162 // Set a Declarator for the implicit definition: int foo(); 3163 const char *Dummy; 3164 DeclSpec DS; 3165 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 3166 Error = Error; // Silence warning. 3167 assert(!Error && "Error setting up implicit decl!"); 3168 Declarator D(DS, Declarator::BlockContext); 3169 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 3170 0, 0, false, SourceLocation(), 3171 false, 0,0,0, Loc, D), 3172 SourceLocation()); 3173 D.SetIdentifier(&II, Loc); 3174 3175 // Insert this function into translation-unit scope. 3176 3177 DeclContext *PrevDC = CurContext; 3178 CurContext = Context.getTranslationUnitDecl(); 3179 3180 FunctionDecl *FD = 3181 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D, DeclPtrTy()).getAs<Decl>()); 3182 FD->setImplicit(); 3183 3184 CurContext = PrevDC; 3185 3186 AddKnownFunctionAttributes(FD); 3187 3188 return FD; 3189} 3190 3191/// \brief Adds any function attributes that we know a priori based on 3192/// the declaration of this function. 3193/// 3194/// These attributes can apply both to implicitly-declared builtins 3195/// (like __builtin___printf_chk) or to library-declared functions 3196/// like NSLog or printf. 3197void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 3198 if (FD->isInvalidDecl()) 3199 return; 3200 3201 // If this is a built-in function, map its builtin attributes to 3202 // actual attributes. 3203 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 3204 // Handle printf-formatting attributes. 3205 unsigned FormatIdx; 3206 bool HasVAListArg; 3207 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 3208 if (!FD->getAttr<FormatAttr>()) 3209 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 3210 FormatIdx + 2)); 3211 } 3212 3213 // Mark const if we don't care about errno and that is the only 3214 // thing preventing the function from being const. This allows 3215 // IRgen to use LLVM intrinsics for such functions. 3216 if (!getLangOptions().MathErrno && 3217 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 3218 if (!FD->getAttr<ConstAttr>()) 3219 FD->addAttr(::new (Context) ConstAttr()); 3220 } 3221 } 3222 3223 IdentifierInfo *Name = FD->getIdentifier(); 3224 if (!Name) 3225 return; 3226 if ((!getLangOptions().CPlusPlus && 3227 FD->getDeclContext()->isTranslationUnit()) || 3228 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 3229 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 3230 LinkageSpecDecl::lang_c)) { 3231 // Okay: this could be a libc/libm/Objective-C function we know 3232 // about. 3233 } else 3234 return; 3235 3236 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 3237 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 3238 // FIXME: We known better than our headers. 3239 const_cast<FormatAttr *>(Format)->setType("printf"); 3240 } else 3241 FD->addAttr(::new (Context) FormatAttr("printf", 1, 2)); 3242 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 3243 if (!FD->getAttr<FormatAttr>()) 3244 FD->addAttr(::new (Context) FormatAttr("printf", 2, 3)); 3245 } 3246} 3247 3248TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T) { 3249 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 3250 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3251 3252 // Scope manipulation handled by caller. 3253 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 3254 D.getIdentifierLoc(), 3255 D.getIdentifier(), 3256 T); 3257 3258 if (TagType *TT = dyn_cast<TagType>(T)) { 3259 TagDecl *TD = TT->getDecl(); 3260 3261 // If the TagDecl that the TypedefDecl points to is an anonymous decl 3262 // keep track of the TypedefDecl. 3263 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 3264 TD->setTypedefForAnonDecl(NewTD); 3265 } 3266 3267 if (D.isInvalidType()) 3268 NewTD->setInvalidDecl(); 3269 return NewTD; 3270} 3271 3272 3273/// \brief Determine whether a tag with a given kind is acceptable 3274/// as a redeclaration of the given tag declaration. 3275/// 3276/// \returns true if the new tag kind is acceptable, false otherwise. 3277bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 3278 TagDecl::TagKind NewTag, 3279 SourceLocation NewTagLoc, 3280 const IdentifierInfo &Name) { 3281 // C++ [dcl.type.elab]p3: 3282 // The class-key or enum keyword present in the 3283 // elaborated-type-specifier shall agree in kind with the 3284 // declaration to which the name in theelaborated-type-specifier 3285 // refers. This rule also applies to the form of 3286 // elaborated-type-specifier that declares a class-name or 3287 // friend class since it can be construed as referring to the 3288 // definition of the class. Thus, in any 3289 // elaborated-type-specifier, the enum keyword shall be used to 3290 // refer to an enumeration (7.2), the union class-keyshall be 3291 // used to refer to a union (clause 9), and either the class or 3292 // struct class-key shall be used to refer to a class (clause 9) 3293 // declared using the class or struct class-key. 3294 TagDecl::TagKind OldTag = Previous->getTagKind(); 3295 if (OldTag == NewTag) 3296 return true; 3297 3298 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 3299 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 3300 // Warn about the struct/class tag mismatch. 3301 bool isTemplate = false; 3302 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 3303 isTemplate = Record->getDescribedClassTemplate(); 3304 3305 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 3306 << (NewTag == TagDecl::TK_class) 3307 << isTemplate << &Name 3308 << CodeModificationHint::CreateReplacement(SourceRange(NewTagLoc), 3309 OldTag == TagDecl::TK_class? "class" : "struct"); 3310 Diag(Previous->getLocation(), diag::note_previous_use); 3311 return true; 3312 } 3313 return false; 3314} 3315 3316/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 3317/// former case, Name will be non-null. In the later case, Name will be null. 3318/// TagSpec indicates what kind of tag this is. TK indicates whether this is a 3319/// reference/declaration/definition of a tag. 3320Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, 3321 SourceLocation KWLoc, const CXXScopeSpec &SS, 3322 IdentifierInfo *Name, SourceLocation NameLoc, 3323 AttributeList *Attr, AccessSpecifier AS, 3324 bool &OwnedDecl) { 3325 // If this is not a definition, it must have a name. 3326 assert((Name != 0 || TK == TK_Definition) && 3327 "Nameless record must be a definition!"); 3328 3329 OwnedDecl = false; 3330 TagDecl::TagKind Kind; 3331 switch (TagSpec) { 3332 default: assert(0 && "Unknown tag type!"); 3333 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 3334 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 3335 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 3336 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 3337 } 3338 3339 DeclContext *SearchDC = CurContext; 3340 DeclContext *DC = CurContext; 3341 NamedDecl *PrevDecl = 0; 3342 3343 bool Invalid = false; 3344 3345 if (Name && SS.isNotEmpty()) { 3346 // We have a nested-name tag ('struct foo::bar'). 3347 3348 // Check for invalid 'foo::'. 3349 if (SS.isInvalid()) { 3350 Name = 0; 3351 goto CreateNewDecl; 3352 } 3353 3354 if (RequireCompleteDeclContext(SS)) 3355 return DeclPtrTy::make((Decl *)0); 3356 3357 DC = computeDeclContext(SS); 3358 SearchDC = DC; 3359 // Look-up name inside 'foo::'. 3360 PrevDecl 3361 = dyn_cast_or_null<TagDecl>( 3362 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 3363 3364 // A tag 'foo::bar' must already exist. 3365 if (PrevDecl == 0) { 3366 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 3367 Name = 0; 3368 Invalid = true; 3369 goto CreateNewDecl; 3370 } 3371 } else if (Name) { 3372 // If this is a named struct, check to see if there was a previous forward 3373 // declaration or definition. 3374 // FIXME: We're looking into outer scopes here, even when we 3375 // shouldn't be. Doing so can result in ambiguities that we 3376 // shouldn't be diagnosing. 3377 LookupResult R = LookupName(S, Name, LookupTagName, 3378 /*RedeclarationOnly=*/(TK != TK_Reference)); 3379 if (R.isAmbiguous()) { 3380 DiagnoseAmbiguousLookup(R, Name, NameLoc); 3381 // FIXME: This is not best way to recover from case like: 3382 // 3383 // struct S s; 3384 // 3385 // causes needless "incomplete type" error later. 3386 Name = 0; 3387 PrevDecl = 0; 3388 Invalid = true; 3389 } 3390 else 3391 PrevDecl = R; 3392 3393 if (!getLangOptions().CPlusPlus && TK != TK_Reference) { 3394 // FIXME: This makes sure that we ignore the contexts associated 3395 // with C structs, unions, and enums when looking for a matching 3396 // tag declaration or definition. See the similar lookup tweak 3397 // in Sema::LookupName; is there a better way to deal with this? 3398 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 3399 SearchDC = SearchDC->getParent(); 3400 } 3401 } 3402 3403 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3404 // Maybe we will complain about the shadowed template parameter. 3405 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 3406 // Just pretend that we didn't see the previous declaration. 3407 PrevDecl = 0; 3408 } 3409 3410 if (PrevDecl) { 3411 // Check whether the previous declaration is usable. 3412 (void)DiagnoseUseOfDecl(PrevDecl, NameLoc); 3413 3414 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 3415 // If this is a use of a previous tag, or if the tag is already declared 3416 // in the same scope (so that the definition/declaration completes or 3417 // rementions the tag), reuse the decl. 3418 if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { 3419 // Make sure that this wasn't declared as an enum and now used as a 3420 // struct or something similar. 3421 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 3422 bool SafeToContinue 3423 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 3424 Kind != TagDecl::TK_enum); 3425 if (SafeToContinue) 3426 Diag(KWLoc, diag::err_use_with_wrong_tag) 3427 << Name 3428 << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), 3429 PrevTagDecl->getKindName()); 3430 else 3431 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 3432 Diag(PrevDecl->getLocation(), diag::note_previous_use); 3433 3434 if (SafeToContinue) 3435 Kind = PrevTagDecl->getTagKind(); 3436 else { 3437 // Recover by making this an anonymous redefinition. 3438 Name = 0; 3439 PrevDecl = 0; 3440 Invalid = true; 3441 } 3442 } 3443 3444 if (!Invalid) { 3445 // If this is a use, just return the declaration we found. 3446 3447 // FIXME: In the future, return a variant or some other clue 3448 // for the consumer of this Decl to know it doesn't own it. 3449 // For our current ASTs this shouldn't be a problem, but will 3450 // need to be changed with DeclGroups. 3451 if (TK == TK_Reference) 3452 return DeclPtrTy::make(PrevDecl); 3453 3454 // Diagnose attempts to redefine a tag. 3455 if (TK == TK_Definition) { 3456 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 3457 Diag(NameLoc, diag::err_redefinition) << Name; 3458 Diag(Def->getLocation(), diag::note_previous_definition); 3459 // If this is a redefinition, recover by making this 3460 // struct be anonymous, which will make any later 3461 // references get the previous definition. 3462 Name = 0; 3463 PrevDecl = 0; 3464 Invalid = true; 3465 } else { 3466 // If the type is currently being defined, complain 3467 // about a nested redefinition. 3468 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 3469 if (Tag->isBeingDefined()) { 3470 Diag(NameLoc, diag::err_nested_redefinition) << Name; 3471 Diag(PrevTagDecl->getLocation(), 3472 diag::note_previous_definition); 3473 Name = 0; 3474 PrevDecl = 0; 3475 Invalid = true; 3476 } 3477 } 3478 3479 // Okay, this is definition of a previously declared or referenced 3480 // tag PrevDecl. We're going to create a new Decl for it. 3481 } 3482 } 3483 // If we get here we have (another) forward declaration or we 3484 // have a definition. Just create a new decl. 3485 } else { 3486 // If we get here, this is a definition of a new tag type in a nested 3487 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 3488 // new decl/type. We set PrevDecl to NULL so that the entities 3489 // have distinct types. 3490 PrevDecl = 0; 3491 } 3492 // If we get here, we're going to create a new Decl. If PrevDecl 3493 // is non-NULL, it's a definition of the tag declared by 3494 // PrevDecl. If it's NULL, we have a new definition. 3495 } else { 3496 // PrevDecl is a namespace, template, or anything else 3497 // that lives in the IDNS_Tag identifier namespace. 3498 if (isDeclInScope(PrevDecl, SearchDC, S)) { 3499 // The tag name clashes with a namespace name, issue an error and 3500 // recover by making this tag be anonymous. 3501 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 3502 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3503 Name = 0; 3504 PrevDecl = 0; 3505 Invalid = true; 3506 } else { 3507 // The existing declaration isn't relevant to us; we're in a 3508 // new scope, so clear out the previous declaration. 3509 PrevDecl = 0; 3510 } 3511 } 3512 } else if (TK == TK_Reference && SS.isEmpty() && Name && 3513 (Kind != TagDecl::TK_enum || !getLangOptions().CPlusPlus)) { 3514 // C++ [basic.scope.pdecl]p5: 3515 // -- for an elaborated-type-specifier of the form 3516 // 3517 // class-key identifier 3518 // 3519 // if the elaborated-type-specifier is used in the 3520 // decl-specifier-seq or parameter-declaration-clause of a 3521 // function defined in namespace scope, the identifier is 3522 // declared as a class-name in the namespace that contains 3523 // the declaration; otherwise, except as a friend 3524 // declaration, the identifier is declared in the smallest 3525 // non-class, non-function-prototype scope that contains the 3526 // declaration. 3527 // 3528 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 3529 // C structs and unions. 3530 // 3531 // GNU C also supports this behavior as part of its incomplete 3532 // enum types extension, while GNU C++ does not. 3533 // 3534 // Find the context where we'll be declaring the tag. 3535 // FIXME: We would like to maintain the current DeclContext as the 3536 // lexical context, 3537 while (SearchDC->isRecord()) 3538 SearchDC = SearchDC->getParent(); 3539 3540 // Find the scope where we'll be declaring the tag. 3541 while (S->isClassScope() || 3542 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 3543 ((S->getFlags() & Scope::DeclScope) == 0) || 3544 (S->getEntity() && 3545 ((DeclContext *)S->getEntity())->isTransparentContext())) 3546 S = S->getParent(); 3547 } 3548 3549CreateNewDecl: 3550 3551 // If there is an identifier, use the location of the identifier as the 3552 // location of the decl, otherwise use the location of the struct/union 3553 // keyword. 3554 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 3555 3556 // Otherwise, create a new declaration. If there is a previous 3557 // declaration of the same entity, the two will be linked via 3558 // PrevDecl. 3559 TagDecl *New; 3560 3561 if (Kind == TagDecl::TK_enum) { 3562 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3563 // enum X { A, B, C } D; D should chain to X. 3564 New = EnumDecl::Create(Context, SearchDC, Loc, Name, 3565 cast_or_null<EnumDecl>(PrevDecl)); 3566 // If this is an undefined enum, warn. 3567 if (TK != TK_Definition && !Invalid) { 3568 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 3569 : diag::ext_forward_ref_enum; 3570 Diag(Loc, DK); 3571 } 3572 } else { 3573 // struct/union/class 3574 3575 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3576 // struct X { int A; } D; D should chain to X. 3577 if (getLangOptions().CPlusPlus) 3578 // FIXME: Look for a way to use RecordDecl for simple structs. 3579 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3580 cast_or_null<CXXRecordDecl>(PrevDecl)); 3581 else 3582 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3583 cast_or_null<RecordDecl>(PrevDecl)); 3584 } 3585 3586 if (Kind != TagDecl::TK_enum) { 3587 // Handle #pragma pack: if the #pragma pack stack has non-default 3588 // alignment, make up a packed attribute for this decl. These 3589 // attributes are checked when the ASTContext lays out the 3590 // structure. 3591 // 3592 // It is important for implementing the correct semantics that this 3593 // happen here (in act on tag decl). The #pragma pack stack is 3594 // maintained as a result of parser callbacks which can occur at 3595 // many points during the parsing of a struct declaration (because 3596 // the #pragma tokens are effectively skipped over during the 3597 // parsing of the struct). 3598 if (unsigned Alignment = getPragmaPackAlignment()) 3599 New->addAttr(::new (Context) PackedAttr(Alignment * 8)); 3600 } 3601 3602 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 3603 // C++ [dcl.typedef]p3: 3604 // [...] Similarly, in a given scope, a class or enumeration 3605 // shall not be declared with the same name as a typedef-name 3606 // that is declared in that scope and refers to a type other 3607 // than the class or enumeration itself. 3608 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 3609 TypedefDecl *PrevTypedef = 0; 3610 if (Lookup.getKind() == LookupResult::Found) 3611 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 3612 3613 if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && 3614 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 3615 Context.getCanonicalType(Context.getTypeDeclType(New))) { 3616 Diag(Loc, diag::err_tag_definition_of_typedef) 3617 << Context.getTypeDeclType(New) 3618 << PrevTypedef->getUnderlyingType(); 3619 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 3620 Invalid = true; 3621 } 3622 } 3623 3624 if (Invalid) 3625 New->setInvalidDecl(); 3626 3627 if (Attr) 3628 ProcessDeclAttributeList(New, Attr); 3629 3630 // If we're declaring or defining a tag in function prototype scope 3631 // in C, note that this type can only be used within the function. 3632 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 3633 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 3634 3635 // Set the lexical context. If the tag has a C++ scope specifier, the 3636 // lexical context will be different from the semantic context. 3637 New->setLexicalDeclContext(CurContext); 3638 3639 // Set the access specifier. 3640 if (!Invalid) 3641 SetMemberAccessSpecifier(New, PrevDecl, AS); 3642 3643 if (TK == TK_Definition) 3644 New->startDefinition(); 3645 3646 // If this has an identifier, add it to the scope stack. 3647 if (Name) { 3648 S = getNonFieldDeclScope(S); 3649 PushOnScopeChains(New, S); 3650 } else { 3651 CurContext->addDecl(Context, New); 3652 } 3653 3654 OwnedDecl = true; 3655 return DeclPtrTy::make(New); 3656} 3657 3658void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 3659 AdjustDeclIfTemplate(TagD); 3660 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 3661 3662 // Enter the tag context. 3663 PushDeclContext(S, Tag); 3664 3665 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 3666 FieldCollector->StartClass(); 3667 3668 if (Record->getIdentifier()) { 3669 // C++ [class]p2: 3670 // [...] The class-name is also inserted into the scope of the 3671 // class itself; this is known as the injected-class-name. For 3672 // purposes of access checking, the injected-class-name is treated 3673 // as if it were a public member name. 3674 CXXRecordDecl *InjectedClassName 3675 = CXXRecordDecl::Create(Context, Record->getTagKind(), 3676 CurContext, Record->getLocation(), 3677 Record->getIdentifier(), Record); 3678 InjectedClassName->setImplicit(); 3679 InjectedClassName->setAccess(AS_public); 3680 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 3681 InjectedClassName->setDescribedClassTemplate(Template); 3682 PushOnScopeChains(InjectedClassName, S); 3683 assert(InjectedClassName->isInjectedClassName() && 3684 "Broken injected-class-name"); 3685 } 3686 } 3687} 3688 3689void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD) { 3690 AdjustDeclIfTemplate(TagD); 3691 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 3692 3693 if (isa<CXXRecordDecl>(Tag)) 3694 FieldCollector->FinishClass(); 3695 3696 // Exit this scope of this tag's definition. 3697 PopDeclContext(); 3698 3699 // Notify the consumer that we've defined a tag. 3700 Consumer.HandleTagDeclDefinition(Tag); 3701} 3702 3703// Note that FieldName may be null for anonymous bitfields. 3704bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 3705 QualType FieldTy, const Expr *BitWidth) { 3706 3707 // C99 6.7.2.1p4 - verify the field type. 3708 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 3709 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 3710 // Handle incomplete types with specific error. 3711 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 3712 return true; 3713 if (FieldName) 3714 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 3715 << FieldName << FieldTy << BitWidth->getSourceRange(); 3716 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 3717 << FieldTy << BitWidth->getSourceRange(); 3718 } 3719 3720 // If the bit-width is type- or value-dependent, don't try to check 3721 // it now. 3722 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 3723 return false; 3724 3725 llvm::APSInt Value; 3726 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 3727 return true; 3728 3729 // Zero-width bitfield is ok for anonymous field. 3730 if (Value == 0 && FieldName) 3731 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 3732 3733 if (Value.isSigned() && Value.isNegative()) { 3734 if (FieldName) 3735 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 3736 << FieldName << Value.toString(10); 3737 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 3738 << Value.toString(10); 3739 } 3740 3741 if (!FieldTy->isDependentType()) { 3742 uint64_t TypeSize = Context.getTypeSize(FieldTy); 3743 if (Value.getZExtValue() > TypeSize) { 3744 if (FieldName) 3745 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 3746 << FieldName << (unsigned)TypeSize; 3747 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 3748 << (unsigned)TypeSize; 3749 } 3750 } 3751 3752 return false; 3753} 3754 3755/// ActOnField - Each field of a struct/union/class is passed into this in order 3756/// to create a FieldDecl object for it. 3757Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 3758 SourceLocation DeclStart, 3759 Declarator &D, ExprTy *BitfieldWidth) { 3760 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 3761 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 3762 AS_public); 3763 return DeclPtrTy::make(Res); 3764} 3765 3766/// HandleField - Analyze a field of a C struct or a C++ data member. 3767/// 3768FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 3769 SourceLocation DeclStart, 3770 Declarator &D, Expr *BitWidth, 3771 AccessSpecifier AS) { 3772 IdentifierInfo *II = D.getIdentifier(); 3773 SourceLocation Loc = DeclStart; 3774 if (II) Loc = D.getIdentifierLoc(); 3775 3776 QualType T = GetTypeForDeclarator(D, S); 3777 if (getLangOptions().CPlusPlus) 3778 CheckExtraCXXDefaultArguments(D); 3779 3780 DiagnoseFunctionSpecifiers(D); 3781 3782 if (D.getDeclSpec().isThreadSpecified()) 3783 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3784 3785 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3786 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 3787 PrevDecl = 0; 3788 3789 FieldDecl *NewFD 3790 = CheckFieldDecl(II, T, Record, Loc, 3791 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable, 3792 BitWidth, AS, PrevDecl, &D); 3793 if (NewFD->isInvalidDecl() && PrevDecl) { 3794 // Don't introduce NewFD into scope; there's already something 3795 // with the same name in the same scope. 3796 } else if (II) { 3797 PushOnScopeChains(NewFD, S); 3798 } else 3799 Record->addDecl(Context, NewFD); 3800 3801 return NewFD; 3802} 3803 3804/// \brief Build a new FieldDecl and check its well-formedness. 3805/// 3806/// This routine builds a new FieldDecl given the fields name, type, 3807/// record, etc. \p PrevDecl should refer to any previous declaration 3808/// with the same name and in the same scope as the field to be 3809/// created. 3810/// 3811/// \returns a new FieldDecl. 3812/// 3813/// \todo The Declarator argument is a hack. It will be removed once 3814FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 3815 RecordDecl *Record, SourceLocation Loc, 3816 bool Mutable, Expr *BitWidth, 3817 AccessSpecifier AS, NamedDecl *PrevDecl, 3818 Declarator *D) { 3819 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3820 bool InvalidDecl = false; 3821 if (D) InvalidDecl = D->isInvalidType(); 3822 3823 // If we receive a broken type, recover by assuming 'int' and 3824 // marking this declaration as invalid. 3825 if (T.isNull()) { 3826 InvalidDecl = true; 3827 T = Context.IntTy; 3828 } 3829 3830 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3831 // than a variably modified type. 3832 if (T->isVariablyModifiedType()) { 3833 bool SizeIsNegative; 3834 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 3835 SizeIsNegative); 3836 if (!FixedTy.isNull()) { 3837 Diag(Loc, diag::warn_illegal_constant_array_size); 3838 T = FixedTy; 3839 } else { 3840 if (SizeIsNegative) 3841 Diag(Loc, diag::err_typecheck_negative_array_size); 3842 else 3843 Diag(Loc, diag::err_typecheck_field_variable_size); 3844 T = Context.IntTy; 3845 InvalidDecl = true; 3846 } 3847 } 3848 3849 // Fields can not have abstract class types 3850 if (RequireNonAbstractType(Loc, T, diag::err_abstract_type_in_decl, 3851 AbstractFieldType)) 3852 InvalidDecl = true; 3853 3854 // If this is declared as a bit-field, check the bit-field. 3855 if (BitWidth && VerifyBitField(Loc, II, T, BitWidth)) { 3856 InvalidDecl = true; 3857 DeleteExpr(BitWidth); 3858 BitWidth = 0; 3859 } 3860 3861 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, BitWidth, 3862 Mutable); 3863 if (InvalidDecl) 3864 NewFD->setInvalidDecl(); 3865 3866 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 3867 Diag(Loc, diag::err_duplicate_member) << II; 3868 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3869 NewFD->setInvalidDecl(); 3870 } 3871 3872 if (getLangOptions().CPlusPlus && !T->isPODType()) 3873 cast<CXXRecordDecl>(Record)->setPOD(false); 3874 3875 // FIXME: We need to pass in the attributes given an AST 3876 // representation, not a parser representation. 3877 if (D) 3878 ProcessDeclAttributes(NewFD, *D); 3879 3880 if (T.isObjCGCWeak()) 3881 Diag(Loc, diag::warn_attribute_weak_on_field); 3882 3883 NewFD->setAccess(AS); 3884 3885 // C++ [dcl.init.aggr]p1: 3886 // An aggregate is an array or a class (clause 9) with [...] no 3887 // private or protected non-static data members (clause 11). 3888 // A POD must be an aggregate. 3889 if (getLangOptions().CPlusPlus && 3890 (AS == AS_private || AS == AS_protected)) { 3891 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 3892 CXXRecord->setAggregate(false); 3893 CXXRecord->setPOD(false); 3894 } 3895 3896 return NewFD; 3897} 3898 3899/// TranslateIvarVisibility - Translate visibility from a token ID to an 3900/// AST enum value. 3901static ObjCIvarDecl::AccessControl 3902TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 3903 switch (ivarVisibility) { 3904 default: assert(0 && "Unknown visitibility kind"); 3905 case tok::objc_private: return ObjCIvarDecl::Private; 3906 case tok::objc_public: return ObjCIvarDecl::Public; 3907 case tok::objc_protected: return ObjCIvarDecl::Protected; 3908 case tok::objc_package: return ObjCIvarDecl::Package; 3909 } 3910} 3911 3912/// ActOnIvar - Each ivar field of an objective-c class is passed into this 3913/// in order to create an IvarDecl object for it. 3914Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 3915 SourceLocation DeclStart, 3916 Declarator &D, ExprTy *BitfieldWidth, 3917 tok::ObjCKeywordKind Visibility) { 3918 3919 IdentifierInfo *II = D.getIdentifier(); 3920 Expr *BitWidth = (Expr*)BitfieldWidth; 3921 SourceLocation Loc = DeclStart; 3922 if (II) Loc = D.getIdentifierLoc(); 3923 3924 // FIXME: Unnamed fields can be handled in various different ways, for 3925 // example, unnamed unions inject all members into the struct namespace! 3926 3927 QualType T = GetTypeForDeclarator(D, S); 3928 3929 if (BitWidth) { 3930 // 6.7.2.1p3, 6.7.2.1p4 3931 if (VerifyBitField(Loc, II, T, BitWidth)) { 3932 D.setInvalidType(); 3933 DeleteExpr(BitWidth); 3934 BitWidth = 0; 3935 } 3936 } else { 3937 // Not a bitfield. 3938 3939 // validate II. 3940 3941 } 3942 3943 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3944 // than a variably modified type. 3945 if (T->isVariablyModifiedType()) { 3946 Diag(Loc, diag::err_typecheck_ivar_variable_size); 3947 D.setInvalidType(); 3948 } 3949 3950 // Get the visibility (access control) for this ivar. 3951 ObjCIvarDecl::AccessControl ac = 3952 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 3953 : ObjCIvarDecl::None; 3954 3955 // Construct the decl. 3956 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, CurContext, Loc, II, T,ac, 3957 (Expr *)BitfieldWidth); 3958 3959 if (II) { 3960 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3961 if (PrevDecl && isDeclInScope(PrevDecl, CurContext, S) 3962 && !isa<TagDecl>(PrevDecl)) { 3963 Diag(Loc, diag::err_duplicate_member) << II; 3964 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3965 NewID->setInvalidDecl(); 3966 } 3967 } 3968 3969 // Process attributes attached to the ivar. 3970 ProcessDeclAttributes(NewID, D); 3971 3972 if (D.isInvalidType()) 3973 NewID->setInvalidDecl(); 3974 3975 if (II) { 3976 // FIXME: When interfaces are DeclContexts, we'll need to add 3977 // these to the interface. 3978 S->AddDecl(DeclPtrTy::make(NewID)); 3979 IdResolver.AddDecl(NewID); 3980 } 3981 3982 return DeclPtrTy::make(NewID); 3983} 3984 3985void Sema::ActOnFields(Scope* S, 3986 SourceLocation RecLoc, DeclPtrTy RecDecl, 3987 DeclPtrTy *Fields, unsigned NumFields, 3988 SourceLocation LBrac, SourceLocation RBrac, 3989 AttributeList *Attr) { 3990 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 3991 assert(EnclosingDecl && "missing record or interface decl"); 3992 3993 // If the decl this is being inserted into is invalid, then it may be a 3994 // redeclaration or some other bogus case. Don't try to add fields to it. 3995 if (EnclosingDecl->isInvalidDecl()) { 3996 // FIXME: Deallocate fields? 3997 return; 3998 } 3999 4000 4001 // Verify that all the fields are okay. 4002 unsigned NumNamedMembers = 0; 4003 llvm::SmallVector<FieldDecl*, 32> RecFields; 4004 4005 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 4006 for (unsigned i = 0; i != NumFields; ++i) { 4007 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 4008 4009 // Get the type for the field. 4010 Type *FDTy = FD->getType().getTypePtr(); 4011 4012 if (!FD->isAnonymousStructOrUnion()) { 4013 // Remember all fields written by the user. 4014 RecFields.push_back(FD); 4015 } 4016 4017 // If the field is already invalid for some reason, don't emit more 4018 // diagnostics about it. 4019 if (FD->isInvalidDecl()) 4020 continue; 4021 4022 // C99 6.7.2.1p2: 4023 // A structure or union shall not contain a member with 4024 // incomplete or function type (hence, a structure shall not 4025 // contain an instance of itself, but may contain a pointer to 4026 // an instance of itself), except that the last member of a 4027 // structure with more than one named member may have incomplete 4028 // array type; such a structure (and any union containing, 4029 // possibly recursively, a member that is such a structure) 4030 // shall not be a member of a structure or an element of an 4031 // array. 4032 if (FDTy->isFunctionType()) { 4033 // Field declared as a function. 4034 Diag(FD->getLocation(), diag::err_field_declared_as_function) 4035 << FD->getDeclName(); 4036 FD->setInvalidDecl(); 4037 EnclosingDecl->setInvalidDecl(); 4038 continue; 4039 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 4040 Record && Record->isStruct()) { 4041 // Flexible array member. 4042 if (NumNamedMembers < 1) { 4043 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 4044 << FD->getDeclName(); 4045 FD->setInvalidDecl(); 4046 EnclosingDecl->setInvalidDecl(); 4047 continue; 4048 } 4049 // Okay, we have a legal flexible array member at the end of the struct. 4050 if (Record) 4051 Record->setHasFlexibleArrayMember(true); 4052 } else if (!FDTy->isDependentType() && 4053 RequireCompleteType(FD->getLocation(), FD->getType(), 4054 diag::err_field_incomplete)) { 4055 // Incomplete type 4056 FD->setInvalidDecl(); 4057 EnclosingDecl->setInvalidDecl(); 4058 continue; 4059 } else if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 4060 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 4061 // If this is a member of a union, then entire union becomes "flexible". 4062 if (Record && Record->isUnion()) { 4063 Record->setHasFlexibleArrayMember(true); 4064 } else { 4065 // If this is a struct/class and this is not the last element, reject 4066 // it. Note that GCC supports variable sized arrays in the middle of 4067 // structures. 4068 if (i != NumFields-1) 4069 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 4070 << FD->getDeclName() << FD->getType(); 4071 else { 4072 // We support flexible arrays at the end of structs in 4073 // other structs as an extension. 4074 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 4075 << FD->getDeclName(); 4076 if (Record) 4077 Record->setHasFlexibleArrayMember(true); 4078 } 4079 } 4080 } 4081 } else if (FDTy->isObjCInterfaceType()) { 4082 /// A field cannot be an Objective-c object 4083 Diag(FD->getLocation(), diag::err_statically_allocated_object); 4084 FD->setInvalidDecl(); 4085 EnclosingDecl->setInvalidDecl(); 4086 continue; 4087 } 4088 // Keep track of the number of named members. 4089 if (FD->getIdentifier()) 4090 ++NumNamedMembers; 4091 } 4092 4093 // Okay, we successfully defined 'Record'. 4094 if (Record) { 4095 Record->completeDefinition(Context); 4096 } else { 4097 ObjCIvarDecl **ClsFields = 4098 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 4099 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 4100 ID->setIVarList(ClsFields, RecFields.size(), Context); 4101 ID->setLocEnd(RBrac); 4102 4103 // Must enforce the rule that ivars in the base classes may not be 4104 // duplicates. 4105 if (ID->getSuperClass()) { 4106 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 4107 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 4108 ObjCIvarDecl* Ivar = (*IVI); 4109 4110 if (IdentifierInfo *II = Ivar->getIdentifier()) { 4111 ObjCIvarDecl* prevIvar = 4112 ID->getSuperClass()->lookupInstanceVariable(Context, II); 4113 if (prevIvar) { 4114 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 4115 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 4116 } 4117 } 4118 } 4119 } 4120 } else if (ObjCImplementationDecl *IMPDecl = 4121 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 4122 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 4123 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) { 4124 // FIXME: Set the DeclContext correctly when we build the 4125 // declarations. 4126 ClsFields[I]->setLexicalDeclContext(IMPDecl); 4127 IMPDecl->addDecl(Context, ClsFields[I]); 4128 } 4129 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 4130 } 4131 } 4132 4133 if (Attr) 4134 ProcessDeclAttributeList(Record, Attr); 4135} 4136 4137EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 4138 EnumConstantDecl *LastEnumConst, 4139 SourceLocation IdLoc, 4140 IdentifierInfo *Id, 4141 ExprArg val) { 4142 Expr *Val = (Expr *)val.get(); 4143 4144 llvm::APSInt EnumVal(32); 4145 QualType EltTy; 4146 if (Val && !Val->isTypeDependent()) { 4147 // Make sure to promote the operand type to int. 4148 UsualUnaryConversions(Val); 4149 if (Val != val.get()) { 4150 val.release(); 4151 val = Val; 4152 } 4153 4154 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 4155 SourceLocation ExpLoc; 4156 if (!Val->isValueDependent() && 4157 VerifyIntegerConstantExpression(Val, &EnumVal)) { 4158 Val = 0; 4159 } else { 4160 EltTy = Val->getType(); 4161 } 4162 } 4163 4164 if (!Val) { 4165 if (LastEnumConst) { 4166 // Assign the last value + 1. 4167 EnumVal = LastEnumConst->getInitVal(); 4168 ++EnumVal; 4169 4170 // Check for overflow on increment. 4171 if (EnumVal < LastEnumConst->getInitVal()) 4172 Diag(IdLoc, diag::warn_enum_value_overflow); 4173 4174 EltTy = LastEnumConst->getType(); 4175 } else { 4176 // First value, set to zero. 4177 EltTy = Context.IntTy; 4178 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 4179 } 4180 } 4181 4182 val.release(); 4183 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 4184 Val, EnumVal); 4185} 4186 4187 4188Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 4189 DeclPtrTy lastEnumConst, 4190 SourceLocation IdLoc, 4191 IdentifierInfo *Id, 4192 SourceLocation EqualLoc, ExprTy *val) { 4193 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 4194 EnumConstantDecl *LastEnumConst = 4195 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 4196 Expr *Val = static_cast<Expr*>(val); 4197 4198 // The scope passed in may not be a decl scope. Zip up the scope tree until 4199 // we find one that is. 4200 S = getNonFieldDeclScope(S); 4201 4202 // Verify that there isn't already something declared with this name in this 4203 // scope. 4204 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 4205 if (PrevDecl && PrevDecl->isTemplateParameter()) { 4206 // Maybe we will complain about the shadowed template parameter. 4207 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 4208 // Just pretend that we didn't see the previous declaration. 4209 PrevDecl = 0; 4210 } 4211 4212 if (PrevDecl) { 4213 // When in C++, we may get a TagDecl with the same name; in this case the 4214 // enum constant will 'hide' the tag. 4215 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 4216 "Received TagDecl when not in C++!"); 4217 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 4218 if (isa<EnumConstantDecl>(PrevDecl)) 4219 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 4220 else 4221 Diag(IdLoc, diag::err_redefinition) << Id; 4222 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4223 if (Val) Val->Destroy(Context); 4224 return DeclPtrTy(); 4225 } 4226 } 4227 4228 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 4229 IdLoc, Id, Owned(Val)); 4230 4231 // Register this decl in the current scope stack. 4232 if (New) 4233 PushOnScopeChains(New, S); 4234 4235 return DeclPtrTy::make(New); 4236} 4237 4238void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 4239 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 4240 DeclPtrTy *Elements, unsigned NumElements) { 4241 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 4242 QualType EnumType = Context.getTypeDeclType(Enum); 4243 4244 // TODO: If the result value doesn't fit in an int, it must be a long or long 4245 // long value. ISO C does not support this, but GCC does as an extension, 4246 // emit a warning. 4247 unsigned IntWidth = Context.Target.getIntWidth(); 4248 4249 // Verify that all the values are okay, compute the size of the values, and 4250 // reverse the list. 4251 unsigned NumNegativeBits = 0; 4252 unsigned NumPositiveBits = 0; 4253 4254 // Keep track of whether all elements have type int. 4255 bool AllElementsInt = true; 4256 4257 for (unsigned i = 0; i != NumElements; ++i) { 4258 EnumConstantDecl *ECD = 4259 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 4260 if (!ECD) continue; // Already issued a diagnostic. 4261 4262 // If the enum value doesn't fit in an int, emit an extension warning. 4263 const llvm::APSInt &InitVal = ECD->getInitVal(); 4264 assert(InitVal.getBitWidth() >= IntWidth && 4265 "Should have promoted value to int"); 4266 if (InitVal.getBitWidth() > IntWidth) { 4267 llvm::APSInt V(InitVal); 4268 V.trunc(IntWidth); 4269 V.extend(InitVal.getBitWidth()); 4270 if (V != InitVal) 4271 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 4272 << InitVal.toString(10); 4273 } 4274 4275 // Keep track of the size of positive and negative values. 4276 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 4277 NumPositiveBits = std::max(NumPositiveBits, 4278 (unsigned)InitVal.getActiveBits()); 4279 else 4280 NumNegativeBits = std::max(NumNegativeBits, 4281 (unsigned)InitVal.getMinSignedBits()); 4282 4283 // Keep track of whether every enum element has type int (very commmon). 4284 if (AllElementsInt) 4285 AllElementsInt = ECD->getType() == Context.IntTy; 4286 } 4287 4288 // Figure out the type that should be used for this enum. 4289 // FIXME: Support attribute(packed) on enums and -fshort-enums. 4290 QualType BestType; 4291 unsigned BestWidth; 4292 4293 if (NumNegativeBits) { 4294 // If there is a negative value, figure out the smallest integer type (of 4295 // int/long/longlong) that fits. 4296 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 4297 BestType = Context.IntTy; 4298 BestWidth = IntWidth; 4299 } else { 4300 BestWidth = Context.Target.getLongWidth(); 4301 4302 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 4303 BestType = Context.LongTy; 4304 else { 4305 BestWidth = Context.Target.getLongLongWidth(); 4306 4307 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 4308 Diag(Enum->getLocation(), diag::warn_enum_too_large); 4309 BestType = Context.LongLongTy; 4310 } 4311 } 4312 } else { 4313 // If there is no negative value, figure out which of uint, ulong, ulonglong 4314 // fits. 4315 if (NumPositiveBits <= IntWidth) { 4316 BestType = Context.UnsignedIntTy; 4317 BestWidth = IntWidth; 4318 } else if (NumPositiveBits <= 4319 (BestWidth = Context.Target.getLongWidth())) { 4320 BestType = Context.UnsignedLongTy; 4321 } else { 4322 BestWidth = Context.Target.getLongLongWidth(); 4323 assert(NumPositiveBits <= BestWidth && 4324 "How could an initializer get larger than ULL?"); 4325 BestType = Context.UnsignedLongLongTy; 4326 } 4327 } 4328 4329 // Loop over all of the enumerator constants, changing their types to match 4330 // the type of the enum if needed. 4331 for (unsigned i = 0; i != NumElements; ++i) { 4332 EnumConstantDecl *ECD = 4333 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 4334 if (!ECD) continue; // Already issued a diagnostic. 4335 4336 // Standard C says the enumerators have int type, but we allow, as an 4337 // extension, the enumerators to be larger than int size. If each 4338 // enumerator value fits in an int, type it as an int, otherwise type it the 4339 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 4340 // that X has type 'int', not 'unsigned'. 4341 if (ECD->getType() == Context.IntTy) { 4342 // Make sure the init value is signed. 4343 llvm::APSInt IV = ECD->getInitVal(); 4344 IV.setIsSigned(true); 4345 ECD->setInitVal(IV); 4346 4347 if (getLangOptions().CPlusPlus) 4348 // C++ [dcl.enum]p4: Following the closing brace of an 4349 // enum-specifier, each enumerator has the type of its 4350 // enumeration. 4351 ECD->setType(EnumType); 4352 continue; // Already int type. 4353 } 4354 4355 // Determine whether the value fits into an int. 4356 llvm::APSInt InitVal = ECD->getInitVal(); 4357 bool FitsInInt; 4358 if (InitVal.isUnsigned() || !InitVal.isNegative()) 4359 FitsInInt = InitVal.getActiveBits() < IntWidth; 4360 else 4361 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 4362 4363 // If it fits into an integer type, force it. Otherwise force it to match 4364 // the enum decl type. 4365 QualType NewTy; 4366 unsigned NewWidth; 4367 bool NewSign; 4368 if (FitsInInt) { 4369 NewTy = Context.IntTy; 4370 NewWidth = IntWidth; 4371 NewSign = true; 4372 } else if (ECD->getType() == BestType) { 4373 // Already the right type! 4374 if (getLangOptions().CPlusPlus) 4375 // C++ [dcl.enum]p4: Following the closing brace of an 4376 // enum-specifier, each enumerator has the type of its 4377 // enumeration. 4378 ECD->setType(EnumType); 4379 continue; 4380 } else { 4381 NewTy = BestType; 4382 NewWidth = BestWidth; 4383 NewSign = BestType->isSignedIntegerType(); 4384 } 4385 4386 // Adjust the APSInt value. 4387 InitVal.extOrTrunc(NewWidth); 4388 InitVal.setIsSigned(NewSign); 4389 ECD->setInitVal(InitVal); 4390 4391 // Adjust the Expr initializer and type. 4392 if (ECD->getInitExpr()) 4393 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), 4394 /*isLvalue=*/false)); 4395 if (getLangOptions().CPlusPlus) 4396 // C++ [dcl.enum]p4: Following the closing brace of an 4397 // enum-specifier, each enumerator has the type of its 4398 // enumeration. 4399 ECD->setType(EnumType); 4400 else 4401 ECD->setType(NewTy); 4402 } 4403 4404 Enum->completeDefinition(Context, BestType); 4405} 4406 4407Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 4408 ExprArg expr) { 4409 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 4410 4411 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 4412 Loc, AsmString); 4413 CurContext->addDecl(Context, New); 4414 return DeclPtrTy::make(New); 4415} 4416