SemaDecl.cpp revision 319ac896a0fef7365d5589b8021db7e41207fe42
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 "clang/AST/APValue.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclObjC.h" 19#include "clang/AST/DeclTemplate.h" 20#include "clang/AST/ExprCXX.h" 21#include "clang/Parse/DeclSpec.h" 22#include "clang/Basic/TargetInfo.h" 23#include "clang/Basic/SourceManager.h" 24// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 25#include "clang/Lex/Preprocessor.h" 26#include "clang/Lex/HeaderSearch.h" 27#include "llvm/ADT/SmallSet.h" 28#include "llvm/ADT/STLExtras.h" 29#include <algorithm> 30#include <functional> 31using namespace clang; 32 33/// getDeclName - Return a pretty name for the specified decl if possible, or 34/// an empty string if not. This is used for pretty crash reporting. 35std::string Sema::getDeclName(DeclPtrTy d) { 36 Decl *D = d.getAs<Decl>(); 37 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 38 return DN->getQualifiedNameAsString(); 39 return ""; 40} 41 42Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) { 43 return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>())); 44} 45 46/// \brief If the identifier refers to a type name within this scope, 47/// return the declaration of that type. 48/// 49/// This routine performs ordinary name lookup of the identifier II 50/// within the given scope, with optional C++ scope specifier SS, to 51/// determine whether the name refers to a type. If so, returns an 52/// opaque pointer (actually a QualType) corresponding to that 53/// type. Otherwise, returns NULL. 54/// 55/// If name lookup results in an ambiguity, this routine will complain 56/// and then return NULL. 57Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 58 Scope *S, const CXXScopeSpec *SS) { 59 // C++ [temp.res]p3: 60 // A qualified-id that refers to a type and in which the 61 // nested-name-specifier depends on a template-parameter (14.6.2) 62 // shall be prefixed by the keyword typename to indicate that the 63 // qualified-id denotes a type, forming an 64 // elaborated-type-specifier (7.1.5.3). 65 // 66 // We therefore do not perform any name lookup up SS is a dependent 67 // scope name. FIXME: we will need to perform a special kind of 68 // lookup if the scope specifier names a member of the current 69 // instantiation. 70 if (SS && isDependentScopeSpecifier(*SS)) 71 return 0; 72 73 NamedDecl *IIDecl = 0; 74 LookupResult Result = LookupParsedName(S, SS, &II, LookupOrdinaryName, 75 false, false); 76 switch (Result.getKind()) { 77 case LookupResult::NotFound: 78 case LookupResult::FoundOverloaded: 79 return 0; 80 81 case LookupResult::AmbiguousBaseSubobjectTypes: 82 case LookupResult::AmbiguousBaseSubobjects: 83 case LookupResult::AmbiguousReference: { 84 // Look to see if we have a type anywhere in the list of results. 85 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 86 Res != ResEnd; ++Res) { 87 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 88 if (!IIDecl || 89 (*Res)->getLocation().getRawEncoding() < 90 IIDecl->getLocation().getRawEncoding()) 91 IIDecl = *Res; 92 } 93 } 94 95 if (!IIDecl) { 96 // None of the entities we found is a type, so there is no way 97 // to even assume that the result is a type. In this case, don't 98 // complain about the ambiguity. The parser will either try to 99 // perform this lookup again (e.g., as an object name), which 100 // will produce the ambiguity, or will complain that it expected 101 // a type name. 102 Result.Destroy(); 103 return 0; 104 } 105 106 // We found a type within the ambiguous lookup; diagnose the 107 // ambiguity and then return that type. This might be the right 108 // answer, or it might not be, but it suppresses any attempt to 109 // perform the name lookup again. 110 DiagnoseAmbiguousLookup(Result, DeclarationName(&II), NameLoc); 111 break; 112 } 113 114 case LookupResult::Found: 115 IIDecl = Result.getAsDecl(); 116 break; 117 } 118 119 if (IIDecl) { 120 QualType T; 121 122 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 123 // Check whether we can use this type 124 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 125 126 T = Context.getTypeDeclType(TD); 127 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 128 // Check whether we can use this interface. 129 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 130 131 T = Context.getObjCInterfaceType(IDecl); 132 } else 133 return 0; 134 135 if (SS) 136 T = getQualifiedNameType(*SS, T); 137 138 return T.getAsOpaquePtr(); 139 } 140 141 return 0; 142} 143 144/// isTagName() - This method is called *for error recovery purposes only* 145/// to determine if the specified name is a valid tag name ("struct foo"). If 146/// so, this returns the TST for the tag corresponding to it (TST_enum, 147/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 148/// where the user forgot to specify the tag. 149DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 150 // Do a tag name lookup in this scope. 151 LookupResult R = LookupName(S, &II, LookupTagName, false, false); 152 if (R.getKind() == LookupResult::Found) 153 if (const TagDecl *TD = dyn_cast<TagDecl>(R.getAsDecl())) { 154 switch (TD->getTagKind()) { 155 case TagDecl::TK_struct: return DeclSpec::TST_struct; 156 case TagDecl::TK_union: return DeclSpec::TST_union; 157 case TagDecl::TK_class: return DeclSpec::TST_class; 158 case TagDecl::TK_enum: return DeclSpec::TST_enum; 159 } 160 } 161 162 return DeclSpec::TST_unspecified; 163} 164 165 166 167DeclContext *Sema::getContainingDC(DeclContext *DC) { 168 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) { 169 // A C++ out-of-line method will return to the file declaration context. 170 if (MD->isOutOfLineDefinition()) 171 return MD->getLexicalDeclContext(); 172 173 // A C++ inline method is parsed *after* the topmost class it was declared 174 // in is fully parsed (it's "complete"). 175 // The parsing of a C++ inline method happens at the declaration context of 176 // the topmost (non-nested) class it is lexically declared in. 177 assert(isa<CXXRecordDecl>(MD->getParent()) && "C++ method not in Record."); 178 DC = MD->getParent(); 179 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 180 DC = RD; 181 182 // Return the declaration context of the topmost class the inline method is 183 // declared in. 184 return DC; 185 } 186 187 if (isa<ObjCMethodDecl>(DC)) 188 return Context.getTranslationUnitDecl(); 189 190 return DC->getLexicalParent(); 191} 192 193void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 194 assert(getContainingDC(DC) == CurContext && 195 "The next DeclContext should be lexically contained in the current one."); 196 CurContext = DC; 197 S->setEntity(DC); 198} 199 200void Sema::PopDeclContext() { 201 assert(CurContext && "DeclContext imbalance!"); 202 203 CurContext = getContainingDC(CurContext); 204} 205 206/// \brief Determine whether we allow overloading of the function 207/// PrevDecl with another declaration. 208/// 209/// This routine determines whether overloading is possible, not 210/// whether some new function is actually an overload. It will return 211/// true in C++ (where we can always provide overloads) or, as an 212/// extension, in C when the previous function is already an 213/// overloaded function declaration or has the "overloadable" 214/// attribute. 215static bool AllowOverloadingOfFunction(Decl *PrevDecl, ASTContext &Context) { 216 if (Context.getLangOptions().CPlusPlus) 217 return true; 218 219 if (isa<OverloadedFunctionDecl>(PrevDecl)) 220 return true; 221 222 return PrevDecl->getAttr<OverloadableAttr>() != 0; 223} 224 225/// Add this decl to the scope shadowed decl chains. 226void Sema::PushOnScopeChains(NamedDecl *D, Scope *S) { 227 // Move up the scope chain until we find the nearest enclosing 228 // non-transparent context. The declaration will be introduced into this 229 // scope. 230 while (S->getEntity() && 231 ((DeclContext *)S->getEntity())->isTransparentContext()) 232 S = S->getParent(); 233 234 S->AddDecl(DeclPtrTy::make(D)); 235 236 // Add scoped declarations into their context, so that they can be 237 // found later. Declarations without a context won't be inserted 238 // into any context. 239 CurContext->addDecl(Context, D); 240 241 // C++ [basic.scope]p4: 242 // -- exactly one declaration shall declare a class name or 243 // enumeration name that is not a typedef name and the other 244 // declarations shall all refer to the same object or 245 // enumerator, or all refer to functions and function templates; 246 // in this case the class name or enumeration name is hidden. 247 if (TagDecl *TD = dyn_cast<TagDecl>(D)) { 248 // We are pushing the name of a tag (enum or class). 249 if (CurContext->getLookupContext() 250 == TD->getDeclContext()->getLookupContext()) { 251 // We're pushing the tag into the current context, which might 252 // require some reshuffling in the identifier resolver. 253 IdentifierResolver::iterator 254 I = IdResolver.begin(TD->getDeclName()), 255 IEnd = IdResolver.end(); 256 if (I != IEnd && isDeclInScope(*I, CurContext, S)) { 257 NamedDecl *PrevDecl = *I; 258 for (; I != IEnd && isDeclInScope(*I, CurContext, S); 259 PrevDecl = *I, ++I) { 260 if (TD->declarationReplaces(*I)) { 261 // This is a redeclaration. Remove it from the chain and 262 // break out, so that we'll add in the shadowed 263 // declaration. 264 S->RemoveDecl(DeclPtrTy::make(*I)); 265 if (PrevDecl == *I) { 266 IdResolver.RemoveDecl(*I); 267 IdResolver.AddDecl(TD); 268 return; 269 } else { 270 IdResolver.RemoveDecl(*I); 271 break; 272 } 273 } 274 } 275 276 // There is already a declaration with the same name in the same 277 // scope, which is not a tag declaration. It must be found 278 // before we find the new declaration, so insert the new 279 // declaration at the end of the chain. 280 IdResolver.AddShadowedDecl(TD, PrevDecl); 281 282 return; 283 } 284 } 285 } else if (isa<FunctionDecl>(D) && 286 AllowOverloadingOfFunction(D, Context)) { 287 // We are pushing the name of a function, which might be an 288 // overloaded name. 289 FunctionDecl *FD = cast<FunctionDecl>(D); 290 IdentifierResolver::iterator Redecl 291 = std::find_if(IdResolver.begin(FD->getDeclName()), 292 IdResolver.end(), 293 std::bind1st(std::mem_fun(&NamedDecl::declarationReplaces), 294 FD)); 295 if (Redecl != IdResolver.end() && 296 S->isDeclScope(DeclPtrTy::make(*Redecl))) { 297 // There is already a declaration of a function on our 298 // IdResolver chain. Replace it with this declaration. 299 S->RemoveDecl(DeclPtrTy::make(*Redecl)); 300 IdResolver.RemoveDecl(*Redecl); 301 } 302 } 303 304 IdResolver.AddDecl(D); 305} 306 307void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 308 if (S->decl_empty()) return; 309 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 310 "Scope shouldn't contain decls!"); 311 312 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 313 I != E; ++I) { 314 Decl *TmpD = (*I).getAs<Decl>(); 315 assert(TmpD && "This decl didn't get pushed??"); 316 317 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 318 NamedDecl *D = cast<NamedDecl>(TmpD); 319 320 if (!D->getDeclName()) continue; 321 322 // Remove this name from our lexical scope. 323 IdResolver.RemoveDecl(D); 324 } 325} 326 327/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 328/// return 0 if one not found. 329ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 330 // The third "scope" argument is 0 since we aren't enabling lazy built-in 331 // creation from this context. 332 NamedDecl *IDecl = LookupName(TUScope, Id, LookupOrdinaryName); 333 334 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 335} 336 337/// getNonFieldDeclScope - Retrieves the innermost scope, starting 338/// from S, where a non-field would be declared. This routine copes 339/// with the difference between C and C++ scoping rules in structs and 340/// unions. For example, the following code is well-formed in C but 341/// ill-formed in C++: 342/// @code 343/// struct S6 { 344/// enum { BAR } e; 345/// }; 346/// 347/// void test_S6() { 348/// struct S6 a; 349/// a.e = BAR; 350/// } 351/// @endcode 352/// For the declaration of BAR, this routine will return a different 353/// scope. The scope S will be the scope of the unnamed enumeration 354/// within S6. In C++, this routine will return the scope associated 355/// with S6, because the enumeration's scope is a transparent 356/// context but structures can contain non-field names. In C, this 357/// routine will return the translation unit scope, since the 358/// enumeration's scope is a transparent context and structures cannot 359/// contain non-field names. 360Scope *Sema::getNonFieldDeclScope(Scope *S) { 361 while (((S->getFlags() & Scope::DeclScope) == 0) || 362 (S->getEntity() && 363 ((DeclContext *)S->getEntity())->isTransparentContext()) || 364 (S->isClassScope() && !getLangOptions().CPlusPlus)) 365 S = S->getParent(); 366 return S; 367} 368 369void Sema::InitBuiltinVaListType() { 370 if (!Context.getBuiltinVaListType().isNull()) 371 return; 372 373 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 374 NamedDecl *VaDecl = LookupName(TUScope, VaIdent, LookupOrdinaryName); 375 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 376 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 377} 378 379/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 380/// file scope. lazily create a decl for it. ForRedeclaration is true 381/// if we're creating this built-in in anticipation of redeclaring the 382/// built-in. 383NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 384 Scope *S, bool ForRedeclaration, 385 SourceLocation Loc) { 386 Builtin::ID BID = (Builtin::ID)bid; 387 388 if (Context.BuiltinInfo.hasVAListUse(BID)) 389 InitBuiltinVaListType(); 390 391 Builtin::Context::GetBuiltinTypeError Error; 392 QualType R = Context.BuiltinInfo.GetBuiltinType(BID, Context, Error); 393 switch (Error) { 394 case Builtin::Context::GE_None: 395 // Okay 396 break; 397 398 case Builtin::Context::GE_Missing_FILE: 399 if (ForRedeclaration) 400 Diag(Loc, diag::err_implicit_decl_requires_stdio) 401 << Context.BuiltinInfo.GetName(BID); 402 return 0; 403 } 404 405 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 406 Diag(Loc, diag::ext_implicit_lib_function_decl) 407 << Context.BuiltinInfo.GetName(BID) 408 << R; 409 if (Context.BuiltinInfo.getHeaderName(BID) && 410 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 411 != Diagnostic::Ignored) 412 Diag(Loc, diag::note_please_include_header) 413 << Context.BuiltinInfo.getHeaderName(BID) 414 << Context.BuiltinInfo.GetName(BID); 415 } 416 417 FunctionDecl *New = FunctionDecl::Create(Context, 418 Context.getTranslationUnitDecl(), 419 Loc, II, R, 420 FunctionDecl::Extern, false, 421 /*hasPrototype=*/true); 422 New->setImplicit(); 423 424 // Create Decl objects for each parameter, adding them to the 425 // FunctionDecl. 426 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 427 llvm::SmallVector<ParmVarDecl*, 16> Params; 428 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 429 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 430 FT->getArgType(i), VarDecl::None, 0)); 431 New->setParams(Context, &Params[0], Params.size()); 432 } 433 434 AddKnownFunctionAttributes(New); 435 436 // TUScope is the translation-unit scope to insert this function into. 437 // FIXME: This is hideous. We need to teach PushOnScopeChains to 438 // relate Scopes to DeclContexts, and probably eliminate CurContext 439 // entirely, but we're not there yet. 440 DeclContext *SavedContext = CurContext; 441 CurContext = Context.getTranslationUnitDecl(); 442 PushOnScopeChains(New, TUScope); 443 CurContext = SavedContext; 444 return New; 445} 446 447/// GetStdNamespace - This method gets the C++ "std" namespace. This is where 448/// everything from the standard library is defined. 449NamespaceDecl *Sema::GetStdNamespace() { 450 if (!StdNamespace) { 451 IdentifierInfo *StdIdent = &PP.getIdentifierTable().get("std"); 452 DeclContext *Global = Context.getTranslationUnitDecl(); 453 Decl *Std = LookupQualifiedName(Global, StdIdent, LookupNamespaceName); 454 StdNamespace = dyn_cast_or_null<NamespaceDecl>(Std); 455 } 456 return StdNamespace; 457} 458 459/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 460/// same name and scope as a previous declaration 'Old'. Figure out 461/// how to resolve this situation, merging decls or emitting 462/// diagnostics as appropriate. Returns true if there was an error, 463/// false otherwise. 464/// 465bool Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 466 bool objc_types = false; 467 // Allow multiple definitions for ObjC built-in typedefs. 468 // FIXME: Verify the underlying types are equivalent! 469 if (getLangOptions().ObjC1) { 470 const IdentifierInfo *TypeID = New->getIdentifier(); 471 switch (TypeID->getLength()) { 472 default: break; 473 case 2: 474 if (!TypeID->isStr("id")) 475 break; 476 Context.setObjCIdType(Context.getTypeDeclType(New)); 477 objc_types = true; 478 break; 479 case 5: 480 if (!TypeID->isStr("Class")) 481 break; 482 Context.setObjCClassType(Context.getTypeDeclType(New)); 483 objc_types = true; 484 return false; 485 case 3: 486 if (!TypeID->isStr("SEL")) 487 break; 488 Context.setObjCSelType(Context.getTypeDeclType(New)); 489 objc_types = true; 490 return false; 491 case 8: 492 if (!TypeID->isStr("Protocol")) 493 break; 494 Context.setObjCProtoType(New->getUnderlyingType()); 495 objc_types = true; 496 return false; 497 } 498 // Fall through - the typedef name was not a builtin type. 499 } 500 // Verify the old decl was also a type. 501 TypeDecl *Old = dyn_cast<TypeDecl>(OldD); 502 if (!Old) { 503 Diag(New->getLocation(), diag::err_redefinition_different_kind) 504 << New->getDeclName(); 505 if (!objc_types) 506 Diag(OldD->getLocation(), diag::note_previous_definition); 507 return true; 508 } 509 510 // Determine the "old" type we'll use for checking and diagnostics. 511 QualType OldType; 512 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 513 OldType = OldTypedef->getUnderlyingType(); 514 else 515 OldType = Context.getTypeDeclType(Old); 516 517 // If the typedef types are not identical, reject them in all languages and 518 // with any extensions enabled. 519 520 if (OldType != New->getUnderlyingType() && 521 Context.getCanonicalType(OldType) != 522 Context.getCanonicalType(New->getUnderlyingType())) { 523 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 524 << New->getUnderlyingType() << OldType; 525 if (!objc_types) 526 Diag(Old->getLocation(), diag::note_previous_definition); 527 return true; 528 } 529 if (objc_types) return false; 530 if (getLangOptions().Microsoft) return false; 531 532 // C++ [dcl.typedef]p2: 533 // In a given non-class scope, a typedef specifier can be used to 534 // redefine the name of any type declared in that scope to refer 535 // to the type to which it already refers. 536 if (getLangOptions().CPlusPlus) { 537 if (!isa<CXXRecordDecl>(CurContext)) 538 return false; 539 Diag(New->getLocation(), diag::err_redefinition) 540 << New->getDeclName(); 541 Diag(Old->getLocation(), diag::note_previous_definition); 542 return true; 543 } 544 545 // If we have a redefinition of a typedef in C, emit a warning. This warning 546 // is normally mapped to an error, but can be controlled with 547 // -Wtypedef-redefinition. 548 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 549 << New->getDeclName(); 550 Diag(Old->getLocation(), diag::note_previous_definition); 551 return false; 552} 553 554/// DeclhasAttr - returns true if decl Declaration already has the target 555/// attribute. 556static bool DeclHasAttr(const Decl *decl, const Attr *target) { 557 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 558 if (attr->getKind() == target->getKind()) 559 return true; 560 561 return false; 562} 563 564/// MergeAttributes - append attributes from the Old decl to the New one. 565static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 566 Attr *attr = const_cast<Attr*>(Old->getAttrs()); 567 568 while (attr) { 569 Attr *tmp = attr; 570 attr = attr->getNext(); 571 572 if (!DeclHasAttr(New, tmp) && tmp->isMerged()) { 573 tmp->setInherited(true); 574 New->addAttr(tmp); 575 } else { 576 tmp->setNext(0); 577 tmp->Destroy(C); 578 } 579 } 580 581 Old->invalidateAttrs(); 582} 583 584/// Used in MergeFunctionDecl to keep track of function parameters in 585/// C. 586struct GNUCompatibleParamWarning { 587 ParmVarDecl *OldParm; 588 ParmVarDecl *NewParm; 589 QualType PromotedType; 590}; 591 592/// MergeFunctionDecl - We just parsed a function 'New' from 593/// declarator D which has the same name and scope as a previous 594/// declaration 'Old'. Figure out how to resolve this situation, 595/// merging decls or emitting diagnostics as appropriate. 596/// 597/// In C++, New and Old must be declarations that are not 598/// overloaded. Use IsOverload to determine whether New and Old are 599/// overloaded, and to select the Old declaration that New should be 600/// merged with. 601/// 602/// Returns true if there was an error, false otherwise. 603bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 604 assert(!isa<OverloadedFunctionDecl>(OldD) && 605 "Cannot merge with an overloaded function declaration"); 606 607 // Verify the old decl was also a function. 608 FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); 609 if (!Old) { 610 Diag(New->getLocation(), diag::err_redefinition_different_kind) 611 << New->getDeclName(); 612 Diag(OldD->getLocation(), diag::note_previous_definition); 613 return true; 614 } 615 616 // Determine whether the previous declaration was a definition, 617 // implicit declaration, or a declaration. 618 diag::kind PrevDiag; 619 if (Old->isThisDeclarationADefinition()) 620 PrevDiag = diag::note_previous_definition; 621 else if (Old->isImplicit()) 622 PrevDiag = diag::note_previous_implicit_declaration; 623 else 624 PrevDiag = diag::note_previous_declaration; 625 626 QualType OldQType = Context.getCanonicalType(Old->getType()); 627 QualType NewQType = Context.getCanonicalType(New->getType()); 628 629 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 630 New->getStorageClass() == FunctionDecl::Static && 631 Old->getStorageClass() != FunctionDecl::Static) { 632 Diag(New->getLocation(), diag::err_static_non_static) 633 << New; 634 Diag(Old->getLocation(), PrevDiag); 635 return true; 636 } 637 638 if (getLangOptions().CPlusPlus) { 639 // (C++98 13.1p2): 640 // Certain function declarations cannot be overloaded: 641 // -- Function declarations that differ only in the return type 642 // cannot be overloaded. 643 QualType OldReturnType 644 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 645 QualType NewReturnType 646 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 647 if (OldReturnType != NewReturnType) { 648 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 649 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 650 return true; 651 } 652 653 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 654 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 655 if (OldMethod && NewMethod && 656 OldMethod->getLexicalDeclContext() == 657 NewMethod->getLexicalDeclContext()) { 658 // -- Member function declarations with the same name and the 659 // same parameter types cannot be overloaded if any of them 660 // is a static member function declaration. 661 if (OldMethod->isStatic() || NewMethod->isStatic()) { 662 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 663 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 664 return true; 665 } 666 667 // C++ [class.mem]p1: 668 // [...] A member shall not be declared twice in the 669 // member-specification, except that a nested class or member 670 // class template can be declared and then later defined. 671 unsigned NewDiag; 672 if (isa<CXXConstructorDecl>(OldMethod)) 673 NewDiag = diag::err_constructor_redeclared; 674 else if (isa<CXXDestructorDecl>(NewMethod)) 675 NewDiag = diag::err_destructor_redeclared; 676 else if (isa<CXXConversionDecl>(NewMethod)) 677 NewDiag = diag::err_conv_function_redeclared; 678 else 679 NewDiag = diag::err_member_redeclared; 680 681 Diag(New->getLocation(), NewDiag); 682 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 683 } 684 685 // (C++98 8.3.5p3): 686 // All declarations for a function shall agree exactly in both the 687 // return type and the parameter-type-list. 688 if (OldQType == NewQType) 689 return MergeCompatibleFunctionDecls(New, Old); 690 691 // Fall through for conflicting redeclarations and redefinitions. 692 } 693 694 // C: Function types need to be compatible, not identical. This handles 695 // duplicate function decls like "void f(int); void f(enum X);" properly. 696 if (!getLangOptions().CPlusPlus && 697 Context.typesAreCompatible(OldQType, NewQType)) { 698 const FunctionType *OldFuncType = OldQType->getAsFunctionType(); 699 const FunctionType *NewFuncType = NewQType->getAsFunctionType(); 700 const FunctionProtoType *OldProto = 0; 701 if (isa<FunctionNoProtoType>(NewFuncType) && 702 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 703 // The old declaration provided a function prototype, but the 704 // new declaration does not. Merge in the prototype. 705 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 706 OldProto->arg_type_end()); 707 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 708 &ParamTypes[0], ParamTypes.size(), 709 OldProto->isVariadic(), 710 OldProto->getTypeQuals()); 711 New->setType(NewQType); 712 New->setInheritedPrototype(); 713 714 // Synthesize a parameter for each argument type. 715 llvm::SmallVector<ParmVarDecl*, 16> Params; 716 for (FunctionProtoType::arg_type_iterator 717 ParamType = OldProto->arg_type_begin(), 718 ParamEnd = OldProto->arg_type_end(); 719 ParamType != ParamEnd; ++ParamType) { 720 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 721 SourceLocation(), 0, 722 *ParamType, VarDecl::None, 723 0); 724 Param->setImplicit(); 725 Params.push_back(Param); 726 } 727 728 New->setParams(Context, &Params[0], Params.size()); 729 } 730 731 return MergeCompatibleFunctionDecls(New, Old); 732 } 733 734 // GNU C permits a K&R definition to follow a prototype declaration 735 // if the declared types of the parameters in the K&R definition 736 // match the types in the prototype declaration, even when the 737 // promoted types of the parameters from the K&R definition differ 738 // from the types in the prototype. GCC then keeps the types from 739 // the prototype. 740 if (!getLangOptions().CPlusPlus && 741 !getLangOptions().NoExtensions && 742 Old->hasPrototype() && !New->hasPrototype() && 743 New->getType()->getAsFunctionProtoType() && 744 Old->getNumParams() == New->getNumParams()) { 745 llvm::SmallVector<QualType, 16> ArgTypes; 746 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 747 const FunctionProtoType *OldProto 748 = Old->getType()->getAsFunctionProtoType(); 749 const FunctionProtoType *NewProto 750 = New->getType()->getAsFunctionProtoType(); 751 752 // Determine whether this is the GNU C extension. 753 bool GNUCompatible = 754 Context.typesAreCompatible(OldProto->getResultType(), 755 NewProto->getResultType()) && 756 (OldProto->isVariadic() == NewProto->isVariadic()); 757 for (unsigned Idx = 0, End = Old->getNumParams(); 758 GNUCompatible && Idx != End; ++Idx) { 759 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 760 ParmVarDecl *NewParm = New->getParamDecl(Idx); 761 if (Context.typesAreCompatible(OldParm->getType(), 762 NewProto->getArgType(Idx))) { 763 ArgTypes.push_back(NewParm->getType()); 764 } else if (Context.typesAreCompatible(OldParm->getType(), 765 NewParm->getType())) { 766 GNUCompatibleParamWarning Warn 767 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 768 Warnings.push_back(Warn); 769 ArgTypes.push_back(NewParm->getType()); 770 } else 771 GNUCompatible = false; 772 } 773 774 if (GNUCompatible) { 775 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 776 Diag(Warnings[Warn].NewParm->getLocation(), 777 diag::ext_param_promoted_not_compatible_with_prototype) 778 << Warnings[Warn].PromotedType 779 << Warnings[Warn].OldParm->getType(); 780 Diag(Warnings[Warn].OldParm->getLocation(), 781 diag::note_previous_declaration); 782 } 783 784 New->setType(Context.getFunctionType(NewProto->getResultType(), 785 &ArgTypes[0], ArgTypes.size(), 786 NewProto->isVariadic(), 787 NewProto->getTypeQuals())); 788 return MergeCompatibleFunctionDecls(New, Old); 789 } 790 791 // Fall through to diagnose conflicting types. 792 } 793 794 // A function that has already been declared has been redeclared or defined 795 // with a different type- show appropriate diagnostic 796 if (unsigned BuiltinID = Old->getBuiltinID(Context)) { 797 // The user has declared a builtin function with an incompatible 798 // signature. 799 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 800 // The function the user is redeclaring is a library-defined 801 // function like 'malloc' or 'printf'. Warn about the 802 // redeclaration, then pretend that we don't know about this 803 // library built-in. 804 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 805 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 806 << Old << Old->getType(); 807 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 808 Old->setInvalidDecl(); 809 return false; 810 } 811 812 PrevDiag = diag::note_previous_builtin_declaration; 813 } 814 815 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 816 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 817 return true; 818} 819 820/// \brief Completes the merge of two function declarations that are 821/// known to be compatible. 822/// 823/// This routine handles the merging of attributes and other 824/// properties of function declarations form the old declaration to 825/// the new declaration, once we know that New is in fact a 826/// redeclaration of Old. 827/// 828/// \returns false 829bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 830 // Merge the attributes 831 MergeAttributes(New, Old, Context); 832 833 // Merge the storage class. 834 New->setStorageClass(Old->getStorageClass()); 835 836 // Merge "inline" 837 if (Old->isInline()) 838 New->setInline(true); 839 840 // If this function declaration by itself qualifies as a C99 inline 841 // definition (C99 6.7.4p6), but the previous definition did not, 842 // then the function is not a C99 inline definition. 843 if (New->isC99InlineDefinition() && !Old->isC99InlineDefinition()) 844 New->setC99InlineDefinition(false); 845 else if (Old->isC99InlineDefinition() && !New->isC99InlineDefinition()) { 846 // Mark all preceding definitions as not being C99 inline definitions. 847 for (const FunctionDecl *Prev = Old; Prev; 848 Prev = Prev->getPreviousDeclaration()) 849 const_cast<FunctionDecl *>(Prev)->setC99InlineDefinition(false); 850 } 851 852 // Merge "pure" flag. 853 if (Old->isPure()) 854 New->setPure(); 855 856 // Merge the "deleted" flag. 857 if (Old->isDeleted()) 858 New->setDeleted(); 859 860 if (getLangOptions().CPlusPlus) 861 return MergeCXXFunctionDecl(New, Old); 862 863 return false; 864} 865 866/// MergeVarDecl - We just parsed a variable 'New' which has the same name 867/// and scope as a previous declaration 'Old'. Figure out how to resolve this 868/// situation, merging decls or emitting diagnostics as appropriate. 869/// 870/// Tentative definition rules (C99 6.9.2p2) are checked by 871/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 872/// definitions here, since the initializer hasn't been attached. 873/// 874bool Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 875 // Verify the old decl was also a variable. 876 VarDecl *Old = dyn_cast<VarDecl>(OldD); 877 if (!Old) { 878 Diag(New->getLocation(), diag::err_redefinition_different_kind) 879 << New->getDeclName(); 880 Diag(OldD->getLocation(), diag::note_previous_definition); 881 return true; 882 } 883 884 MergeAttributes(New, Old, Context); 885 886 // Merge the types 887 QualType MergedT = Context.mergeTypes(New->getType(), Old->getType()); 888 if (MergedT.isNull()) { 889 Diag(New->getLocation(), diag::err_redefinition_different_type) 890 << New->getDeclName(); 891 Diag(Old->getLocation(), diag::note_previous_definition); 892 return true; 893 } 894 New->setType(MergedT); 895 896 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 897 if (New->getStorageClass() == VarDecl::Static && 898 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 899 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 900 Diag(Old->getLocation(), diag::note_previous_definition); 901 return true; 902 } 903 // C99 6.2.2p4: 904 // For an identifier declared with the storage-class specifier 905 // extern in a scope in which a prior declaration of that 906 // identifier is visible,23) if the prior declaration specifies 907 // internal or external linkage, the linkage of the identifier at 908 // the later declaration is the same as the linkage specified at 909 // the prior declaration. If no prior declaration is visible, or 910 // if the prior declaration specifies no linkage, then the 911 // identifier has external linkage. 912 if (New->hasExternalStorage() && Old->hasLinkage()) 913 /* Okay */; 914 else if (New->getStorageClass() != VarDecl::Static && 915 Old->getStorageClass() == VarDecl::Static) { 916 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 917 Diag(Old->getLocation(), diag::note_previous_definition); 918 return true; 919 } 920 921 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 922 923 // FIXME: The test for external storage here seems wrong? We still 924 // need to check for mismatches. 925 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 926 // Don't complain about out-of-line definitions of static members. 927 !(Old->getLexicalDeclContext()->isRecord() && 928 !New->getLexicalDeclContext()->isRecord())) { 929 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 930 Diag(Old->getLocation(), diag::note_previous_definition); 931 return true; 932 } 933 934 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 935 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 936 Diag(Old->getLocation(), diag::note_previous_definition); 937 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 938 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 939 Diag(Old->getLocation(), diag::note_previous_definition); 940 } 941 942 // Keep a chain of previous declarations. 943 New->setPreviousDeclaration(Old); 944 945 return false; 946} 947 948/// CheckParmsForFunctionDef - Check that the parameters of the given 949/// function are appropriate for the definition of a function. This 950/// takes care of any checks that cannot be performed on the 951/// declaration itself, e.g., that the types of each of the function 952/// parameters are complete. 953bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 954 bool HasInvalidParm = false; 955 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 956 ParmVarDecl *Param = FD->getParamDecl(p); 957 958 // C99 6.7.5.3p4: the parameters in a parameter type list in a 959 // function declarator that is part of a function definition of 960 // that function shall not have incomplete type. 961 // 962 // This is also C++ [dcl.fct]p6. 963 if (!Param->isInvalidDecl() && 964 RequireCompleteType(Param->getLocation(), Param->getType(), 965 diag::err_typecheck_decl_incomplete_type)) { 966 Param->setInvalidDecl(); 967 HasInvalidParm = true; 968 } 969 970 // C99 6.9.1p5: If the declarator includes a parameter type list, the 971 // declaration of each parameter shall include an identifier. 972 if (Param->getIdentifier() == 0 && 973 !Param->isImplicit() && 974 !getLangOptions().CPlusPlus) 975 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 976 } 977 978 return HasInvalidParm; 979} 980 981/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 982/// no declarator (e.g. "struct foo;") is parsed. 983Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 984 // FIXME: Error on auto/register at file scope 985 // FIXME: Error on inline/virtual/explicit 986 // FIXME: Error on invalid restrict 987 // FIXME: Warn on useless __thread 988 // FIXME: Warn on useless const/volatile 989 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 990 // FIXME: Warn on useless attributes 991 992 TagDecl *Tag = 0; 993 if (DS.getTypeSpecType() == DeclSpec::TST_class || 994 DS.getTypeSpecType() == DeclSpec::TST_struct || 995 DS.getTypeSpecType() == DeclSpec::TST_union || 996 DS.getTypeSpecType() == DeclSpec::TST_enum) 997 Tag = dyn_cast<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 998 999 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1000 if (!Record->getDeclName() && Record->isDefinition() && 1001 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1002 if (getLangOptions().CPlusPlus || 1003 Record->getDeclContext()->isRecord()) 1004 return BuildAnonymousStructOrUnion(S, DS, Record); 1005 1006 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1007 << DS.getSourceRange(); 1008 } 1009 1010 // Microsoft allows unnamed struct/union fields. Don't complain 1011 // about them. 1012 // FIXME: Should we support Microsoft's extensions in this area? 1013 if (Record->getDeclName() && getLangOptions().Microsoft) 1014 return DeclPtrTy::make(Tag); 1015 } 1016 1017 if (!DS.isMissingDeclaratorOk() && 1018 DS.getTypeSpecType() != DeclSpec::TST_error) { 1019 // Warn about typedefs of enums without names, since this is an 1020 // extension in both Microsoft an GNU. 1021 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1022 Tag && isa<EnumDecl>(Tag)) { 1023 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1024 << DS.getSourceRange(); 1025 return DeclPtrTy::make(Tag); 1026 } 1027 1028 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1029 << DS.getSourceRange(); 1030 return DeclPtrTy(); 1031 } 1032 1033 return DeclPtrTy::make(Tag); 1034} 1035 1036/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1037/// anonymous struct or union AnonRecord into the owning context Owner 1038/// and scope S. This routine will be invoked just after we realize 1039/// that an unnamed union or struct is actually an anonymous union or 1040/// struct, e.g., 1041/// 1042/// @code 1043/// union { 1044/// int i; 1045/// float f; 1046/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1047/// // f into the surrounding scope.x 1048/// @endcode 1049/// 1050/// This routine is recursive, injecting the names of nested anonymous 1051/// structs/unions into the owning context and scope as well. 1052bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1053 RecordDecl *AnonRecord) { 1054 bool Invalid = false; 1055 for (RecordDecl::field_iterator F = AnonRecord->field_begin(Context), 1056 FEnd = AnonRecord->field_end(Context); 1057 F != FEnd; ++F) { 1058 if ((*F)->getDeclName()) { 1059 NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 1060 LookupOrdinaryName, true); 1061 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 1062 // C++ [class.union]p2: 1063 // The names of the members of an anonymous union shall be 1064 // distinct from the names of any other entity in the 1065 // scope in which the anonymous union is declared. 1066 unsigned diagKind 1067 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 1068 : diag::err_anonymous_struct_member_redecl; 1069 Diag((*F)->getLocation(), diagKind) 1070 << (*F)->getDeclName(); 1071 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1072 Invalid = true; 1073 } else { 1074 // C++ [class.union]p2: 1075 // For the purpose of name lookup, after the anonymous union 1076 // definition, the members of the anonymous union are 1077 // considered to have been defined in the scope in which the 1078 // anonymous union is declared. 1079 Owner->makeDeclVisibleInContext(Context, *F); 1080 S->AddDecl(DeclPtrTy::make(*F)); 1081 IdResolver.AddDecl(*F); 1082 } 1083 } else if (const RecordType *InnerRecordType 1084 = (*F)->getType()->getAsRecordType()) { 1085 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1086 if (InnerRecord->isAnonymousStructOrUnion()) 1087 Invalid = Invalid || 1088 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1089 } 1090 } 1091 1092 return Invalid; 1093} 1094 1095/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1096/// anonymous structure or union. Anonymous unions are a C++ feature 1097/// (C++ [class.union]) and a GNU C extension; anonymous structures 1098/// are a GNU C and GNU C++ extension. 1099Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1100 RecordDecl *Record) { 1101 DeclContext *Owner = Record->getDeclContext(); 1102 1103 // Diagnose whether this anonymous struct/union is an extension. 1104 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1105 Diag(Record->getLocation(), diag::ext_anonymous_union); 1106 else if (!Record->isUnion()) 1107 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1108 1109 // C and C++ require different kinds of checks for anonymous 1110 // structs/unions. 1111 bool Invalid = false; 1112 if (getLangOptions().CPlusPlus) { 1113 const char* PrevSpec = 0; 1114 // C++ [class.union]p3: 1115 // Anonymous unions declared in a named namespace or in the 1116 // global namespace shall be declared static. 1117 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1118 (isa<TranslationUnitDecl>(Owner) || 1119 (isa<NamespaceDecl>(Owner) && 1120 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1121 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1122 Invalid = true; 1123 1124 // Recover by adding 'static'. 1125 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); 1126 } 1127 // C++ [class.union]p3: 1128 // A storage class is not allowed in a declaration of an 1129 // anonymous union in a class scope. 1130 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1131 isa<RecordDecl>(Owner)) { 1132 Diag(DS.getStorageClassSpecLoc(), 1133 diag::err_anonymous_union_with_storage_spec); 1134 Invalid = true; 1135 1136 // Recover by removing the storage specifier. 1137 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1138 PrevSpec); 1139 } 1140 1141 // C++ [class.union]p2: 1142 // The member-specification of an anonymous union shall only 1143 // define non-static data members. [Note: nested types and 1144 // functions cannot be declared within an anonymous union. ] 1145 for (DeclContext::decl_iterator Mem = Record->decls_begin(Context), 1146 MemEnd = Record->decls_end(Context); 1147 Mem != MemEnd; ++Mem) { 1148 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1149 // C++ [class.union]p3: 1150 // An anonymous union shall not have private or protected 1151 // members (clause 11). 1152 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1153 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1154 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1155 Invalid = true; 1156 } 1157 } else if ((*Mem)->isImplicit()) { 1158 // Any implicit members are fine. 1159 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1160 // This is a type that showed up in an 1161 // elaborated-type-specifier inside the anonymous struct or 1162 // union, but which actually declares a type outside of the 1163 // anonymous struct or union. It's okay. 1164 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1165 if (!MemRecord->isAnonymousStructOrUnion() && 1166 MemRecord->getDeclName()) { 1167 // This is a nested type declaration. 1168 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1169 << (int)Record->isUnion(); 1170 Invalid = true; 1171 } 1172 } else { 1173 // We have something that isn't a non-static data 1174 // member. Complain about it. 1175 unsigned DK = diag::err_anonymous_record_bad_member; 1176 if (isa<TypeDecl>(*Mem)) 1177 DK = diag::err_anonymous_record_with_type; 1178 else if (isa<FunctionDecl>(*Mem)) 1179 DK = diag::err_anonymous_record_with_function; 1180 else if (isa<VarDecl>(*Mem)) 1181 DK = diag::err_anonymous_record_with_static; 1182 Diag((*Mem)->getLocation(), DK) 1183 << (int)Record->isUnion(); 1184 Invalid = true; 1185 } 1186 } 1187 } 1188 1189 if (!Record->isUnion() && !Owner->isRecord()) { 1190 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1191 << (int)getLangOptions().CPlusPlus; 1192 Invalid = true; 1193 } 1194 1195 // Create a declaration for this anonymous struct/union. 1196 NamedDecl *Anon = 0; 1197 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1198 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1199 /*IdentifierInfo=*/0, 1200 Context.getTypeDeclType(Record), 1201 /*BitWidth=*/0, /*Mutable=*/false); 1202 Anon->setAccess(AS_public); 1203 if (getLangOptions().CPlusPlus) 1204 FieldCollector->Add(cast<FieldDecl>(Anon)); 1205 } else { 1206 VarDecl::StorageClass SC; 1207 switch (DS.getStorageClassSpec()) { 1208 default: assert(0 && "Unknown storage class!"); 1209 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1210 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1211 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1212 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1213 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1214 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1215 case DeclSpec::SCS_mutable: 1216 // mutable can only appear on non-static class members, so it's always 1217 // an error here 1218 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1219 Invalid = true; 1220 SC = VarDecl::None; 1221 break; 1222 } 1223 1224 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1225 /*IdentifierInfo=*/0, 1226 Context.getTypeDeclType(Record), 1227 SC, DS.getSourceRange().getBegin()); 1228 } 1229 Anon->setImplicit(); 1230 1231 // Add the anonymous struct/union object to the current 1232 // context. We'll be referencing this object when we refer to one of 1233 // its members. 1234 Owner->addDecl(Context, Anon); 1235 1236 // Inject the members of the anonymous struct/union into the owning 1237 // context and into the identifier resolver chain for name lookup 1238 // purposes. 1239 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1240 Invalid = true; 1241 1242 // Mark this as an anonymous struct/union type. Note that we do not 1243 // do this until after we have already checked and injected the 1244 // members of this anonymous struct/union type, because otherwise 1245 // the members could be injected twice: once by DeclContext when it 1246 // builds its lookup table, and once by 1247 // InjectAnonymousStructOrUnionMembers. 1248 Record->setAnonymousStructOrUnion(true); 1249 1250 if (Invalid) 1251 Anon->setInvalidDecl(); 1252 1253 return DeclPtrTy::make(Anon); 1254} 1255 1256 1257/// GetNameForDeclarator - Determine the full declaration name for the 1258/// given Declarator. 1259DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1260 switch (D.getKind()) { 1261 case Declarator::DK_Abstract: 1262 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 1263 return DeclarationName(); 1264 1265 case Declarator::DK_Normal: 1266 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 1267 return DeclarationName(D.getIdentifier()); 1268 1269 case Declarator::DK_Constructor: { 1270 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1271 Ty = Context.getCanonicalType(Ty); 1272 return Context.DeclarationNames.getCXXConstructorName(Ty); 1273 } 1274 1275 case Declarator::DK_Destructor: { 1276 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1277 Ty = Context.getCanonicalType(Ty); 1278 return Context.DeclarationNames.getCXXDestructorName(Ty); 1279 } 1280 1281 case Declarator::DK_Conversion: { 1282 // FIXME: We'd like to keep the non-canonical type for diagnostics! 1283 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1284 Ty = Context.getCanonicalType(Ty); 1285 return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 1286 } 1287 1288 case Declarator::DK_Operator: 1289 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 1290 return Context.DeclarationNames.getCXXOperatorName( 1291 D.getOverloadedOperator()); 1292 } 1293 1294 assert(false && "Unknown name kind"); 1295 return DeclarationName(); 1296} 1297 1298/// isNearlyMatchingFunction - Determine whether the C++ functions 1299/// Declaration and Definition are "nearly" matching. This heuristic 1300/// is used to improve diagnostics in the case where an out-of-line 1301/// function definition doesn't match any declaration within 1302/// the class or namespace. 1303static bool isNearlyMatchingFunction(ASTContext &Context, 1304 FunctionDecl *Declaration, 1305 FunctionDecl *Definition) { 1306 if (Declaration->param_size() != Definition->param_size()) 1307 return false; 1308 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1309 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1310 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1311 1312 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1313 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 1314 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1315 return false; 1316 } 1317 1318 return true; 1319} 1320 1321Sema::DeclPtrTy 1322Sema::ActOnDeclarator(Scope *S, Declarator &D, bool IsFunctionDefinition) { 1323 DeclarationName Name = GetNameForDeclarator(D); 1324 1325 // All of these full declarators require an identifier. If it doesn't have 1326 // one, the ParsedFreeStandingDeclSpec action should be used. 1327 if (!Name) { 1328 if (!D.getInvalidType()) // Reject this if we think it is valid. 1329 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1330 diag::err_declarator_need_ident) 1331 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1332 return DeclPtrTy(); 1333 } 1334 1335 // The scope passed in may not be a decl scope. Zip up the scope tree until 1336 // we find one that is. 1337 while ((S->getFlags() & Scope::DeclScope) == 0 || 1338 (S->getFlags() & Scope::TemplateParamScope) != 0) 1339 S = S->getParent(); 1340 1341 DeclContext *DC; 1342 NamedDecl *PrevDecl; 1343 NamedDecl *New; 1344 bool InvalidDecl = false; 1345 1346 QualType R = GetTypeForDeclarator(D, S); 1347 if (R.isNull()) { 1348 InvalidDecl = true; 1349 R = Context.IntTy; 1350 if (IsFunctionDefinition) // int(...) 1351 R = Context.getFunctionType(R, 0, 0, true, 0); 1352 1353 } 1354 1355 // See if this is a redefinition of a variable in the same scope. 1356 if (D.getCXXScopeSpec().isInvalid()) { 1357 DC = CurContext; 1358 PrevDecl = 0; 1359 InvalidDecl = true; 1360 } else if (!D.getCXXScopeSpec().isSet()) { 1361 LookupNameKind NameKind = LookupOrdinaryName; 1362 1363 // If the declaration we're planning to build will be a function 1364 // or object with linkage, then look for another declaration with 1365 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1366 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1367 /* Do nothing*/; 1368 else if (R->isFunctionType()) { 1369 if (CurContext->isFunctionOrMethod()) 1370 NameKind = LookupRedeclarationWithLinkage; 1371 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1372 NameKind = LookupRedeclarationWithLinkage; 1373 1374 DC = CurContext; 1375 PrevDecl = LookupName(S, Name, NameKind, true, 1376 D.getDeclSpec().getStorageClassSpec() != 1377 DeclSpec::SCS_static, 1378 D.getIdentifierLoc()); 1379 } else { // Something like "int foo::x;" 1380 DC = computeDeclContext(D.getCXXScopeSpec()); 1381 // FIXME: RequireCompleteDeclContext(D.getCXXScopeSpec()); ? 1382 PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName, true); 1383 1384 // C++ 7.3.1.2p2: 1385 // Members (including explicit specializations of templates) of a named 1386 // namespace can also be defined outside that namespace by explicit 1387 // qualification of the name being defined, provided that the entity being 1388 // defined was already declared in the namespace and the definition appears 1389 // after the point of declaration in a namespace that encloses the 1390 // declarations namespace. 1391 // 1392 // Note that we only check the context at this point. We don't yet 1393 // have enough information to make sure that PrevDecl is actually 1394 // the declaration we want to match. For example, given: 1395 // 1396 // class X { 1397 // void f(); 1398 // void f(float); 1399 // }; 1400 // 1401 // void X::f(int) { } // ill-formed 1402 // 1403 // In this case, PrevDecl will point to the overload set 1404 // containing the two f's declared in X, but neither of them 1405 // matches. 1406 1407 // First check whether we named the global scope. 1408 if (isa<TranslationUnitDecl>(DC)) { 1409 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1410 << Name << D.getCXXScopeSpec().getRange(); 1411 } else if (!CurContext->Encloses(DC)) { 1412 // The qualifying scope doesn't enclose the original declaration. 1413 // Emit diagnostic based on current scope. 1414 SourceLocation L = D.getIdentifierLoc(); 1415 SourceRange R = D.getCXXScopeSpec().getRange(); 1416 if (isa<FunctionDecl>(CurContext)) 1417 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1418 else 1419 Diag(L, diag::err_invalid_declarator_scope) 1420 << Name << cast<NamedDecl>(DC) << R; 1421 InvalidDecl = true; 1422 } 1423 } 1424 1425 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1426 // Maybe we will complain about the shadowed template parameter. 1427 InvalidDecl = InvalidDecl 1428 || DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 1429 // Just pretend that we didn't see the previous declaration. 1430 PrevDecl = 0; 1431 } 1432 1433 // In C++, the previous declaration we find might be a tag type 1434 // (class or enum). In this case, the new declaration will hide the 1435 // tag type. Note that this does does not apply if we're declaring a 1436 // typedef (C++ [dcl.typedef]p4). 1437 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 1438 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1439 PrevDecl = 0; 1440 1441 bool Redeclaration = false; 1442 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1443 New = ActOnTypedefDeclarator(S, D, DC, R, PrevDecl, 1444 InvalidDecl, Redeclaration); 1445 } else if (R->isFunctionType()) { 1446 New = ActOnFunctionDeclarator(S, D, DC, R, PrevDecl, 1447 IsFunctionDefinition, InvalidDecl, 1448 Redeclaration); 1449 } else { 1450 New = ActOnVariableDeclarator(S, D, DC, R, PrevDecl, 1451 InvalidDecl, Redeclaration); 1452 } 1453 1454 if (New == 0) 1455 return DeclPtrTy(); 1456 1457 // If this has an identifier and is not an invalid redeclaration, 1458 // add it to the scope stack. 1459 if (Name && !(Redeclaration && InvalidDecl)) 1460 PushOnScopeChains(New, S); 1461 // If any semantic error occurred, mark the decl as invalid. 1462 if (D.getInvalidType() || InvalidDecl) 1463 New->setInvalidDecl(); 1464 1465 return DeclPtrTy::make(New); 1466} 1467 1468/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 1469/// types into constant array types in certain situations which would otherwise 1470/// be errors (for GCC compatibility). 1471static QualType TryToFixInvalidVariablyModifiedType(QualType T, 1472 ASTContext &Context, 1473 bool &SizeIsNegative) { 1474 // This method tries to turn a variable array into a constant 1475 // array even when the size isn't an ICE. This is necessary 1476 // for compatibility with code that depends on gcc's buggy 1477 // constant expression folding, like struct {char x[(int)(char*)2];} 1478 SizeIsNegative = false; 1479 1480 if (const PointerType* PTy = dyn_cast<PointerType>(T)) { 1481 QualType Pointee = PTy->getPointeeType(); 1482 QualType FixedType = 1483 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 1484 if (FixedType.isNull()) return FixedType; 1485 FixedType = Context.getPointerType(FixedType); 1486 FixedType.setCVRQualifiers(T.getCVRQualifiers()); 1487 return FixedType; 1488 } 1489 1490 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 1491 if (!VLATy) 1492 return QualType(); 1493 // FIXME: We should probably handle this case 1494 if (VLATy->getElementType()->isVariablyModifiedType()) 1495 return QualType(); 1496 1497 Expr::EvalResult EvalResult; 1498 if (!VLATy->getSizeExpr() || 1499 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 1500 !EvalResult.Val.isInt()) 1501 return QualType(); 1502 1503 llvm::APSInt &Res = EvalResult.Val.getInt(); 1504 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) 1505 return Context.getConstantArrayType(VLATy->getElementType(), 1506 Res, ArrayType::Normal, 0); 1507 1508 SizeIsNegative = true; 1509 return QualType(); 1510} 1511 1512/// \brief Register the given locally-scoped external C declaration so 1513/// that it can be found later for redeclarations 1514void 1515Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, NamedDecl *PrevDecl, 1516 Scope *S) { 1517 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 1518 "Decl is not a locally-scoped decl!"); 1519 // Note that we have a locally-scoped external with this name. 1520 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 1521 1522 if (!PrevDecl) 1523 return; 1524 1525 // If there was a previous declaration of this variable, it may be 1526 // in our identifier chain. Update the identifier chain with the new 1527 // declaration. 1528 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 1529 // The previous declaration was found on the identifer resolver 1530 // chain, so remove it from its scope. 1531 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 1532 S = S->getParent(); 1533 1534 if (S) 1535 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 1536 } 1537} 1538 1539/// \brief Diagnose function specifiers on a declaration of an identifier that 1540/// does not identify a function. 1541void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 1542 // FIXME: We should probably indicate the identifier in question to avoid 1543 // confusion for constructs like "inline int a(), b;" 1544 if (D.getDeclSpec().isInlineSpecified()) 1545 Diag(D.getDeclSpec().getInlineSpecLoc(), 1546 diag::err_inline_non_function); 1547 1548 if (D.getDeclSpec().isVirtualSpecified()) 1549 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1550 diag::err_virtual_non_function); 1551 1552 if (D.getDeclSpec().isExplicitSpecified()) 1553 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1554 diag::err_explicit_non_function); 1555} 1556 1557NamedDecl* 1558Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1559 QualType R, Decl* PrevDecl, bool& InvalidDecl, 1560 bool &Redeclaration) { 1561 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1562 if (D.getCXXScopeSpec().isSet()) { 1563 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1564 << D.getCXXScopeSpec().getRange(); 1565 InvalidDecl = true; 1566 // Pretend we didn't see the scope specifier. 1567 DC = 0; 1568 } 1569 1570 if (getLangOptions().CPlusPlus) { 1571 // Check that there are no default arguments (C++ only). 1572 CheckExtraCXXDefaultArguments(D); 1573 } 1574 1575 DiagnoseFunctionSpecifiers(D); 1576 1577 if (D.getDeclSpec().isThreadSpecified()) 1578 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 1579 1580 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R); 1581 if (!NewTD) return 0; 1582 1583 // Handle attributes prior to checking for duplicates in MergeVarDecl 1584 ProcessDeclAttributes(NewTD, D); 1585 // Merge the decl with the existing one if appropriate. If the decl is 1586 // in an outer scope, it isn't the same thing. 1587 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1588 Redeclaration = true; 1589 if (MergeTypeDefDecl(NewTD, PrevDecl)) 1590 InvalidDecl = true; 1591 } 1592 1593 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1594 // then it shall have block scope. 1595 QualType T = NewTD->getUnderlyingType(); 1596 if (T->isVariablyModifiedType()) { 1597 CurFunctionNeedsScopeChecking = true; 1598 1599 if (S->getFnParent() == 0) { 1600 bool SizeIsNegative; 1601 QualType FixedTy = 1602 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1603 if (!FixedTy.isNull()) { 1604 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 1605 NewTD->setUnderlyingType(FixedTy); 1606 } else { 1607 if (SizeIsNegative) 1608 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 1609 else if (T->isVariableArrayType()) 1610 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1611 else 1612 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1613 InvalidDecl = true; 1614 } 1615 } 1616 } 1617 return NewTD; 1618} 1619 1620/// \brief Determines whether the given declaration is an out-of-scope 1621/// previous declaration. 1622/// 1623/// This routine should be invoked when name lookup has found a 1624/// previous declaration (PrevDecl) that is not in the scope where a 1625/// new declaration by the same name is being introduced. If the new 1626/// declaration occurs in a local scope, previous declarations with 1627/// linkage may still be considered previous declarations (C99 1628/// 6.2.2p4-5, C++ [basic.link]p6). 1629/// 1630/// \param PrevDecl the previous declaration found by name 1631/// lookup 1632/// 1633/// \param DC the context in which the new declaration is being 1634/// declared. 1635/// 1636/// \returns true if PrevDecl is an out-of-scope previous declaration 1637/// for a new delcaration with the same name. 1638static bool 1639isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 1640 ASTContext &Context) { 1641 if (!PrevDecl) 1642 return 0; 1643 1644 // FIXME: PrevDecl could be an OverloadedFunctionDecl, in which 1645 // case we need to check each of the overloaded functions. 1646 if (!PrevDecl->hasLinkage()) 1647 return false; 1648 1649 if (Context.getLangOptions().CPlusPlus) { 1650 // C++ [basic.link]p6: 1651 // If there is a visible declaration of an entity with linkage 1652 // having the same name and type, ignoring entities declared 1653 // outside the innermost enclosing namespace scope, the block 1654 // scope declaration declares that same entity and receives the 1655 // linkage of the previous declaration. 1656 DeclContext *OuterContext = DC->getLookupContext(); 1657 if (!OuterContext->isFunctionOrMethod()) 1658 // This rule only applies to block-scope declarations. 1659 return false; 1660 else { 1661 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 1662 if (PrevOuterContext->isRecord()) 1663 // We found a member function: ignore it. 1664 return false; 1665 else { 1666 // Find the innermost enclosing namespace for the new and 1667 // previous declarations. 1668 while (!OuterContext->isFileContext()) 1669 OuterContext = OuterContext->getParent(); 1670 while (!PrevOuterContext->isFileContext()) 1671 PrevOuterContext = PrevOuterContext->getParent(); 1672 1673 // The previous declaration is in a different namespace, so it 1674 // isn't the same function. 1675 if (OuterContext->getPrimaryContext() != 1676 PrevOuterContext->getPrimaryContext()) 1677 return false; 1678 } 1679 } 1680 } 1681 1682 return true; 1683} 1684 1685NamedDecl* 1686Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1687 QualType R,NamedDecl* PrevDecl, bool& InvalidDecl, 1688 bool &Redeclaration) { 1689 DeclarationName Name = GetNameForDeclarator(D); 1690 1691 // Check that there are no default arguments (C++ only). 1692 if (getLangOptions().CPlusPlus) 1693 CheckExtraCXXDefaultArguments(D); 1694 1695 VarDecl *NewVD; 1696 VarDecl::StorageClass SC; 1697 switch (D.getDeclSpec().getStorageClassSpec()) { 1698 default: assert(0 && "Unknown storage class!"); 1699 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1700 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1701 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1702 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1703 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1704 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1705 case DeclSpec::SCS_mutable: 1706 // mutable can only appear on non-static class members, so it's always 1707 // an error here 1708 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1709 InvalidDecl = true; 1710 SC = VarDecl::None; 1711 break; 1712 } 1713 1714 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1715 if (!II) { 1716 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1717 << Name.getAsString(); 1718 return 0; 1719 } 1720 1721 DiagnoseFunctionSpecifiers(D); 1722 1723 if (!DC->isRecord() && S->getFnParent() == 0) { 1724 // C99 6.9p2: The storage-class specifiers auto and register shall not 1725 // appear in the declaration specifiers in an external declaration. 1726 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 1727 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 1728 InvalidDecl = true; 1729 } 1730 } 1731 if (DC->isRecord() && !CurContext->isRecord()) { 1732 // This is an out-of-line definition of a static data member. 1733 if (SC == VarDecl::Static) { 1734 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1735 diag::err_static_out_of_line) 1736 << CodeModificationHint::CreateRemoval( 1737 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 1738 } else if (SC == VarDecl::None) 1739 SC = VarDecl::Static; 1740 } 1741 1742 // The variable can not 1743 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1744 II, R, SC, 1745 // FIXME: Move to DeclGroup... 1746 D.getDeclSpec().getSourceRange().getBegin()); 1747 1748 if (D.getDeclSpec().isThreadSpecified()) { 1749 if (NewVD->hasLocalStorage()) 1750 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 1751 else if (!Context.Target.isTLSSupported()) 1752 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 1753 else 1754 NewVD->setThreadSpecified(true); 1755 } 1756 1757 // Set the lexical context. If the declarator has a C++ scope specifier, the 1758 // lexical context will be different from the semantic context. 1759 NewVD->setLexicalDeclContext(CurContext); 1760 1761 // Handle attributes prior to checking for duplicates in MergeVarDecl 1762 ProcessDeclAttributes(NewVD, D); 1763 1764 // Handle GNU asm-label extension (encoded as an attribute). 1765 if (Expr *E = (Expr*) D.getAsmLabel()) { 1766 // The parser guarantees this is a string. 1767 StringLiteral *SE = cast<StringLiteral>(E); 1768 NewVD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 1769 SE->getByteLength()))); 1770 } 1771 1772 // If name lookup finds a previous declaration that is not in the 1773 // same scope as the new declaration, this may still be an 1774 // acceptable redeclaration. 1775 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 1776 !(NewVD->hasLinkage() && 1777 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 1778 PrevDecl = 0; 1779 1780 // Merge the decl with the existing one if appropriate. 1781 if (PrevDecl) { 1782 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 1783 // The user tried to define a non-static data member 1784 // out-of-line (C++ [dcl.meaning]p1). 1785 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 1786 << D.getCXXScopeSpec().getRange(); 1787 PrevDecl = 0; 1788 InvalidDecl = true; 1789 } 1790 } else if (D.getCXXScopeSpec().isSet()) { 1791 // No previous declaration in the qualifying scope. 1792 Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 1793 << Name << D.getCXXScopeSpec().getRange(); 1794 InvalidDecl = true; 1795 } 1796 1797 if (CheckVariableDeclaration(NewVD, PrevDecl, Redeclaration)) 1798 InvalidDecl = true; 1799 1800 // If this is a locally-scoped extern C variable, update the map of 1801 // such variables. 1802 if (CurContext->isFunctionOrMethod() && NewVD->isExternC(Context) && 1803 !InvalidDecl) 1804 RegisterLocallyScopedExternCDecl(NewVD, PrevDecl, S); 1805 1806 return NewVD; 1807} 1808 1809/// \brief Perform semantic checking on a newly-created variable 1810/// declaration. 1811/// 1812/// This routine performs all of the type-checking required for a 1813/// variable declaration once it has been build. It is used both to 1814/// check variables after they have been parsed and their declarators 1815/// have been translated into a declaration, and to check 1816/// 1817/// \returns true if an error was encountered, false otherwise. 1818bool Sema::CheckVariableDeclaration(VarDecl *NewVD, NamedDecl *PrevDecl, 1819 bool &Redeclaration) { 1820 bool Invalid = false; 1821 1822 QualType T = NewVD->getType(); 1823 1824 if (T->isObjCInterfaceType()) { 1825 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 1826 Invalid = true; 1827 } 1828 1829 // The variable can not have an abstract class type. 1830 if (RequireNonAbstractType(NewVD->getLocation(), T, 1831 diag::err_abstract_type_in_decl, 1832 AbstractVariableType)) 1833 Invalid = true; 1834 1835 // Emit an error if an address space was applied to decl with local storage. 1836 // This includes arrays of objects with address space qualifiers, but not 1837 // automatic variables that point to other address spaces. 1838 // ISO/IEC TR 18037 S5.1.2 1839 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 1840 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 1841 Invalid = true; 1842 } 1843 1844 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 1845 && !NewVD->hasAttr<BlocksAttr>()) 1846 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 1847 1848 bool isVM = T->isVariablyModifiedType(); 1849 if (isVM || NewVD->hasAttr<CleanupAttr>()) 1850 CurFunctionNeedsScopeChecking = true; 1851 1852 if ((isVM && NewVD->hasLinkage()) || 1853 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 1854 bool SizeIsNegative; 1855 QualType FixedTy = 1856 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1857 if (!FixedTy.isNull()) { 1858 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 1859 NewVD->setType(FixedTy); 1860 } else if (T->isVariableArrayType()) { 1861 Invalid = true; 1862 1863 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 1864 // FIXME: This won't give the correct result for 1865 // int a[10][n]; 1866 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 1867 1868 if (NewVD->isFileVarDecl()) 1869 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 1870 << SizeRange; 1871 else if (NewVD->getStorageClass() == VarDecl::Static) 1872 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 1873 << SizeRange; 1874 else 1875 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 1876 << SizeRange; 1877 } else { 1878 Invalid = true; 1879 1880 if (NewVD->isFileVarDecl()) 1881 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 1882 else 1883 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 1884 } 1885 } 1886 1887 if (!PrevDecl && NewVD->isExternC(Context)) { 1888 // Since we did not find anything by this name and we're declaring 1889 // an extern "C" variable, look for a non-visible extern "C" 1890 // declaration with the same name. 1891 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 1892 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 1893 if (Pos != LocallyScopedExternalDecls.end()) 1894 PrevDecl = Pos->second; 1895 } 1896 1897 if (!Invalid && T->isVoidType() && !NewVD->hasExternalStorage()) { 1898 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 1899 << T; 1900 Invalid = true; 1901 } 1902 1903 if (PrevDecl) { 1904 Redeclaration = true; 1905 if (MergeVarDecl(NewVD, PrevDecl)) 1906 Invalid = true; 1907 } 1908 1909 return NewVD->isInvalidDecl() || Invalid; 1910} 1911 1912NamedDecl* 1913Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1914 QualType R, NamedDecl* PrevDecl, 1915 bool IsFunctionDefinition, 1916 bool& InvalidDecl, bool &Redeclaration) { 1917 assert(R.getTypePtr()->isFunctionType()); 1918 1919 DeclarationName Name = GetNameForDeclarator(D); 1920 FunctionDecl::StorageClass SC = FunctionDecl::None; 1921 switch (D.getDeclSpec().getStorageClassSpec()) { 1922 default: assert(0 && "Unknown storage class!"); 1923 case DeclSpec::SCS_auto: 1924 case DeclSpec::SCS_register: 1925 case DeclSpec::SCS_mutable: 1926 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1927 diag::err_typecheck_sclass_func); 1928 InvalidDecl = true; 1929 break; 1930 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 1931 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 1932 case DeclSpec::SCS_static: { 1933 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 1934 // C99 6.7.1p5: 1935 // The declaration of an identifier for a function that has 1936 // block scope shall have no explicit storage-class specifier 1937 // other than extern 1938 // See also (C++ [dcl.stc]p4). 1939 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1940 diag::err_static_block_func); 1941 SC = FunctionDecl::None; 1942 } else 1943 SC = FunctionDecl::Static; 1944 break; 1945 } 1946 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 1947 } 1948 1949 if (D.getDeclSpec().isThreadSpecified()) 1950 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 1951 1952 bool isInline = D.getDeclSpec().isInlineSpecified(); 1953 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1954 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 1955 1956 // Check that the return type is not an abstract class type. 1957 // For record types, this is done by the AbstractClassUsageDiagnoser once 1958 // the class has been completely parsed. 1959 if (!DC->isRecord() && 1960 RequireNonAbstractType(D.getIdentifierLoc(), 1961 R->getAsFunctionType()->getResultType(), 1962 diag::err_abstract_type_in_decl, 1963 AbstractReturnType)) 1964 InvalidDecl = true; 1965 1966 // Do not allow returning a objc interface by-value. 1967 if (R->getAsFunctionType()->getResultType()->isObjCInterfaceType()) { 1968 Diag(D.getIdentifierLoc(), 1969 diag::err_object_cannot_be_passed_returned_by_value) << 0 1970 << R->getAsFunctionType()->getResultType(); 1971 InvalidDecl = true; 1972 } 1973 1974 bool isVirtualOkay = false; 1975 FunctionDecl *NewFD; 1976 if (D.getKind() == Declarator::DK_Constructor) { 1977 // This is a C++ constructor declaration. 1978 assert(DC->isRecord() && 1979 "Constructors can only be declared in a member context"); 1980 1981 InvalidDecl = InvalidDecl || CheckConstructorDeclarator(D, R, SC); 1982 1983 // Create the new declaration 1984 NewFD = CXXConstructorDecl::Create(Context, 1985 cast<CXXRecordDecl>(DC), 1986 D.getIdentifierLoc(), Name, R, 1987 isExplicit, isInline, 1988 /*isImplicitlyDeclared=*/false); 1989 1990 if (InvalidDecl) 1991 NewFD->setInvalidDecl(); 1992 } else if (D.getKind() == Declarator::DK_Destructor) { 1993 // This is a C++ destructor declaration. 1994 if (DC->isRecord()) { 1995 InvalidDecl = InvalidDecl || CheckDestructorDeclarator(D, R, SC); 1996 1997 NewFD = CXXDestructorDecl::Create(Context, 1998 cast<CXXRecordDecl>(DC), 1999 D.getIdentifierLoc(), Name, R, 2000 isInline, 2001 /*isImplicitlyDeclared=*/false); 2002 2003 if (InvalidDecl) 2004 NewFD->setInvalidDecl(); 2005 2006 isVirtualOkay = true; 2007 } else { 2008 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2009 2010 // Create a FunctionDecl to satisfy the function definition parsing 2011 // code path. 2012 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2013 Name, R, SC, isInline, 2014 /*hasPrototype=*/true, 2015 // FIXME: Move to DeclGroup... 2016 D.getDeclSpec().getSourceRange().getBegin()); 2017 InvalidDecl = true; 2018 NewFD->setInvalidDecl(); 2019 } 2020 } else if (D.getKind() == Declarator::DK_Conversion) { 2021 if (!DC->isRecord()) { 2022 Diag(D.getIdentifierLoc(), 2023 diag::err_conv_function_not_member); 2024 return 0; 2025 } else { 2026 InvalidDecl = InvalidDecl || CheckConversionDeclarator(D, R, SC); 2027 2028 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2029 D.getIdentifierLoc(), Name, R, 2030 isInline, isExplicit); 2031 2032 if (InvalidDecl) 2033 NewFD->setInvalidDecl(); 2034 2035 isVirtualOkay = true; 2036 } 2037 } else if (DC->isRecord()) { 2038 // This is a C++ method declaration. 2039 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2040 D.getIdentifierLoc(), Name, R, 2041 (SC == FunctionDecl::Static), isInline); 2042 2043 isVirtualOkay = (SC != FunctionDecl::Static); 2044 } else { 2045 // Determine whether the function was written with a 2046 // prototype. This true when: 2047 // - we're in C++ (where every function has a prototype), 2048 // - there is a prototype in the declarator, or 2049 // - the type R of the function is some kind of typedef or other reference 2050 // to a type name (which eventually refers to a function type). 2051 bool HasPrototype = 2052 getLangOptions().CPlusPlus || 2053 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2054 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2055 2056 NewFD = FunctionDecl::Create(Context, DC, 2057 D.getIdentifierLoc(), 2058 Name, R, SC, isInline, HasPrototype, 2059 // FIXME: Move to DeclGroup... 2060 D.getDeclSpec().getSourceRange().getBegin()); 2061 } 2062 2063 // Set the lexical context. If the declarator has a C++ 2064 // scope specifier, the lexical context will be different 2065 // from the semantic context. 2066 NewFD->setLexicalDeclContext(CurContext); 2067 2068 // C++ [dcl.fct.spec]p5: 2069 // The virtual specifier shall only be used in declarations of 2070 // nonstatic class member functions that appear within a 2071 // member-specification of a class declaration; see 10.3. 2072 // 2073 // FIXME: Checking the 'virtual' specifier is not sufficient. A 2074 // function is also virtual if it overrides an already virtual 2075 // function. This is important to do here because it's part of the 2076 // declaration. 2077 if (isVirtual && !InvalidDecl) { 2078 if (!isVirtualOkay) { 2079 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2080 diag::err_virtual_non_function); 2081 } else if (!CurContext->isRecord()) { 2082 // 'virtual' was specified outside of the class. 2083 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2084 << CodeModificationHint::CreateRemoval( 2085 SourceRange(D.getDeclSpec().getVirtualSpecLoc())); 2086 } else { 2087 // Okay: Add virtual to the method. 2088 cast<CXXMethodDecl>(NewFD)->setVirtual(); 2089 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2090 CurClass->setAggregate(false); 2091 CurClass->setPOD(false); 2092 CurClass->setPolymorphic(true); 2093 CurClass->setHasTrivialConstructor(false); 2094 } 2095 } 2096 2097 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 2098 !CurContext->isRecord()) { 2099 // C++ [class.static]p1: 2100 // A data or function member of a class may be declared static 2101 // in a class definition, in which case it is a static member of 2102 // the class. 2103 2104 // Complain about the 'static' specifier if it's on an out-of-line 2105 // member function definition. 2106 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2107 diag::err_static_out_of_line) 2108 << CodeModificationHint::CreateRemoval( 2109 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 2110 } 2111 2112 // Handle GNU asm-label extension (encoded as an attribute). 2113 if (Expr *E = (Expr*) D.getAsmLabel()) { 2114 // The parser guarantees this is a string. 2115 StringLiteral *SE = cast<StringLiteral>(E); 2116 NewFD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 2117 SE->getByteLength()))); 2118 } 2119 2120 // Copy the parameter declarations from the declarator D to 2121 // the function declaration NewFD, if they are available. 2122 if (D.getNumTypeObjects() > 0) { 2123 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2124 2125 // Create Decl objects for each parameter, adding them to the 2126 // FunctionDecl. 2127 llvm::SmallVector<ParmVarDecl*, 16> Params; 2128 2129 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 2130 // function that takes no arguments, not a function that takes a 2131 // single void argument. 2132 // We let through "const void" here because Sema::GetTypeForDeclarator 2133 // already checks for that case. 2134 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2135 FTI.ArgInfo[0].Param && 2136 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 2137 // empty arg list, don't push any params. 2138 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 2139 2140 // In C++, the empty parameter-type-list must be spelled "void"; a 2141 // typedef of void is not permitted. 2142 if (getLangOptions().CPlusPlus && 2143 Param->getType().getUnqualifiedType() != Context.VoidTy) { 2144 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 2145 } 2146 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 2147 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 2148 Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 2149 } 2150 2151 NewFD->setParams(Context, &Params[0], Params.size()); 2152 } else if (R->getAsTypedefType()) { 2153 // When we're declaring a function with a typedef, as in the 2154 // following example, we'll need to synthesize (unnamed) 2155 // parameters for use in the declaration. 2156 // 2157 // @code 2158 // typedef void fn(int); 2159 // fn f; 2160 // @endcode 2161 const FunctionProtoType *FT = R->getAsFunctionProtoType(); 2162 if (!FT) { 2163 // This is a typedef of a function with no prototype, so we 2164 // don't need to do anything. 2165 } else if ((FT->getNumArgs() == 0) || 2166 (FT->getNumArgs() == 1 && !FT->isVariadic() && 2167 FT->getArgType(0)->isVoidType())) { 2168 // This is a zero-argument function. We don't need to do anything. 2169 } else { 2170 // Synthesize a parameter for each argument type. 2171 llvm::SmallVector<ParmVarDecl*, 16> Params; 2172 for (FunctionProtoType::arg_type_iterator ArgType = FT->arg_type_begin(); 2173 ArgType != FT->arg_type_end(); ++ArgType) { 2174 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, 2175 SourceLocation(), 0, 2176 *ArgType, VarDecl::None, 2177 0); 2178 Param->setImplicit(); 2179 Params.push_back(Param); 2180 } 2181 2182 NewFD->setParams(Context, &Params[0], Params.size()); 2183 } 2184 } 2185 2186 // If name lookup finds a previous declaration that is not in the 2187 // same scope as the new declaration, this may still be an 2188 // acceptable redeclaration. 2189 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 2190 !(NewFD->hasLinkage() && 2191 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 2192 PrevDecl = 0; 2193 2194 // FIXME: We need to determine whether the GNU inline attribute will 2195 // be applied to this function declaration, since it affects 2196 // declaration merging. This hack will go away when the FIXME below 2197 // is resolved, since we should be putting *all* attributes onto the 2198 // declaration now. 2199 for (const AttributeList *Attr = D.getDeclSpec().getAttributes(); 2200 Attr; Attr = Attr->getNext()) { 2201 if (Attr->getKind() == AttributeList::AT_gnu_inline) { 2202 NewFD->addAttr(::new (Context) GNUInlineAttr()); 2203 break; 2204 } 2205 } 2206 2207 // Perform semantic checking on the function declaration. 2208 bool OverloadableAttrRequired = false; // FIXME: HACK! 2209 if (CheckFunctionDeclaration(NewFD, PrevDecl, Redeclaration, 2210 /*FIXME:*/OverloadableAttrRequired)) 2211 InvalidDecl = true; 2212 2213 if (D.getCXXScopeSpec().isSet() && !InvalidDecl) { 2214 // An out-of-line member function declaration must also be a 2215 // definition (C++ [dcl.meaning]p1). 2216 if (!IsFunctionDefinition) { 2217 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2218 << D.getCXXScopeSpec().getRange(); 2219 InvalidDecl = true; 2220 } else if (!Redeclaration) { 2221 // The user tried to provide an out-of-line definition for a 2222 // function that is a member of a class or namespace, but there 2223 // was no such member function declared (C++ [class.mfct]p2, 2224 // C++ [namespace.memdef]p2). For example: 2225 // 2226 // class X { 2227 // void f() const; 2228 // }; 2229 // 2230 // void X::f() { } // ill-formed 2231 // 2232 // Complain about this problem, and attempt to suggest close 2233 // matches (e.g., those that differ only in cv-qualifiers and 2234 // whether the parameter types are references). 2235 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 2236 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 2237 InvalidDecl = true; 2238 2239 LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 2240 true); 2241 assert(!Prev.isAmbiguous() && 2242 "Cannot have an ambiguity in previous-declaration lookup"); 2243 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 2244 Func != FuncEnd; ++Func) { 2245 if (isa<FunctionDecl>(*Func) && 2246 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 2247 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 2248 } 2249 2250 PrevDecl = 0; 2251 } 2252 } 2253 2254 // Handle attributes. We need to have merged decls when handling attributes 2255 // (for example to check for conflicts, etc). 2256 // FIXME: This needs to happen before we merge declarations. Then, 2257 // let attribute merging cope with attribute conflicts. 2258 ProcessDeclAttributes(NewFD, D); 2259 AddKnownFunctionAttributes(NewFD); 2260 2261 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 2262 // If a function name is overloadable in C, then every function 2263 // with that name must be marked "overloadable". 2264 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 2265 << Redeclaration << NewFD; 2266 if (PrevDecl) 2267 Diag(PrevDecl->getLocation(), 2268 diag::note_attribute_overloadable_prev_overload); 2269 NewFD->addAttr(::new (Context) OverloadableAttr()); 2270 } 2271 2272 // If this is a locally-scoped extern C function, update the 2273 // map of such names. 2274 if (CurContext->isFunctionOrMethod() && NewFD->isExternC(Context) 2275 && !InvalidDecl) 2276 RegisterLocallyScopedExternCDecl(NewFD, PrevDecl, S); 2277 2278 return NewFD; 2279} 2280 2281/// \brief Perform semantic checking of a new function declaration. 2282/// 2283/// Performs semantic analysis of the new function declaration 2284/// NewFD. This routine performs all semantic checking that does not 2285/// require the actual declarator involved in the declaration, and is 2286/// used both for the declaration of functions as they are parsed 2287/// (called via ActOnDeclarator) and for the declaration of functions 2288/// that have been instantiated via C++ template instantiation (called 2289/// via InstantiateDecl). 2290/// 2291/// \returns true if there was an error, false otherwise. 2292bool Sema::CheckFunctionDeclaration(FunctionDecl *NewFD, NamedDecl *&PrevDecl, 2293 bool &Redeclaration, 2294 bool &OverloadableAttrRequired) { 2295 bool InvalidDecl = false; 2296 2297 // Semantic checking for this function declaration (in isolation). 2298 if (getLangOptions().CPlusPlus) { 2299 // C++-specific checks. 2300 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) 2301 InvalidDecl = InvalidDecl || CheckConstructor(Constructor); 2302 else if (isa<CXXDestructorDecl>(NewFD)) { 2303 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 2304 Record->setUserDeclaredDestructor(true); 2305 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 2306 // user-defined destructor. 2307 Record->setPOD(false); 2308 2309 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 2310 // declared destructor. 2311 Record->setHasTrivialDestructor(false); 2312 } else if (CXXConversionDecl *Conversion 2313 = dyn_cast<CXXConversionDecl>(NewFD)) 2314 ActOnConversionDeclarator(Conversion); 2315 2316 // Extra checking for C++ overloaded operators (C++ [over.oper]). 2317 if (NewFD->isOverloadedOperator() && 2318 CheckOverloadedOperatorDeclaration(NewFD)) 2319 InvalidDecl = true; 2320 } 2321 2322 // C99 6.7.4p6: 2323 // [... ] For a function with external linkage, the following 2324 // restrictions apply: [...] If all of the file scope declarations 2325 // for a function in a translation unit include the inline 2326 // function specifier without extern, then the definition in that 2327 // translation unit is an inline definition. An inline definition 2328 // does not provide an external definition for the function, and 2329 // does not forbid an external definition in another translation 2330 // unit. 2331 // 2332 // Here we determine whether this function, in isolation, would be a 2333 // C99 inline definition. MergeCompatibleFunctionDecls looks at 2334 // previous declarations. 2335 if (NewFD->isInline() && 2336 NewFD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2337 bool GNUInline = NewFD->hasAttr<GNUInlineAttr>() || 2338 (PrevDecl && PrevDecl->hasAttr<GNUInlineAttr>()); 2339 if (GNUInline || (!getLangOptions().CPlusPlus && !getLangOptions().C99)) { 2340 // GNU "extern inline" is the same as "inline" in C99. 2341 if (NewFD->getStorageClass() == FunctionDecl::Extern) 2342 NewFD->setC99InlineDefinition(true); 2343 } else if (getLangOptions().C99 && 2344 NewFD->getStorageClass() == FunctionDecl::None) 2345 NewFD->setC99InlineDefinition(true); 2346 } 2347 2348 // Check for a previous declaration of this name. 2349 if (!PrevDecl && NewFD->isExternC(Context)) { 2350 // Since we did not find anything by this name and we're declaring 2351 // an extern "C" function, look for a non-visible extern "C" 2352 // declaration with the same name. 2353 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2354 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 2355 if (Pos != LocallyScopedExternalDecls.end()) 2356 PrevDecl = Pos->second; 2357 } 2358 2359 // Merge or overload the declaration with an existing declaration of 2360 // the same name, if appropriate. 2361 if (PrevDecl) { 2362 // Determine whether NewFD is an overload of PrevDecl or 2363 // a declaration that requires merging. If it's an overload, 2364 // there's no more work to do here; we'll just add the new 2365 // function to the scope. 2366 OverloadedFunctionDecl::function_iterator MatchedDecl; 2367 2368 if (!getLangOptions().CPlusPlus && 2369 AllowOverloadingOfFunction(PrevDecl, Context)) { 2370 OverloadableAttrRequired = true; 2371 2372 // Functions marked "overloadable" must have a prototype (that 2373 // we can't get through declaration merging). 2374 if (!NewFD->getType()->getAsFunctionProtoType()) { 2375 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_no_prototype) 2376 << NewFD; 2377 InvalidDecl = true; 2378 Redeclaration = true; 2379 2380 // Turn this into a variadic function with no parameters. 2381 QualType R = Context.getFunctionType( 2382 NewFD->getType()->getAsFunctionType()->getResultType(), 2383 0, 0, true, 0); 2384 NewFD->setType(R); 2385 } 2386 } 2387 2388 if (PrevDecl && 2389 (!AllowOverloadingOfFunction(PrevDecl, Context) || 2390 !IsOverload(NewFD, PrevDecl, MatchedDecl))) { 2391 Redeclaration = true; 2392 Decl *OldDecl = PrevDecl; 2393 2394 // If PrevDecl was an overloaded function, extract the 2395 // FunctionDecl that matched. 2396 if (isa<OverloadedFunctionDecl>(PrevDecl)) 2397 OldDecl = *MatchedDecl; 2398 2399 // NewFD and OldDecl represent declarations that need to be 2400 // merged. 2401 if (MergeFunctionDecl(NewFD, OldDecl)) 2402 InvalidDecl = true; 2403 2404 if (!InvalidDecl) 2405 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 2406 } 2407 } 2408 2409 if (getLangOptions().CPlusPlus && !CurContext->isRecord()) { 2410 // In C++, check default arguments now that we have merged decls. Unless 2411 // the lexical context is the class, because in this case this is done 2412 // during delayed parsing anyway. 2413 CheckCXXDefaultArguments(NewFD); 2414 } 2415 2416 return InvalidDecl || NewFD->isInvalidDecl(); 2417} 2418 2419bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 2420 // FIXME: Need strict checking. In C89, we need to check for 2421 // any assignment, increment, decrement, function-calls, or 2422 // commas outside of a sizeof. In C99, it's the same list, 2423 // except that the aforementioned are allowed in unevaluated 2424 // expressions. Everything else falls under the 2425 // "may accept other forms of constant expressions" exception. 2426 // (We never end up here for C++, so the constant expression 2427 // rules there don't matter.) 2428 if (Init->isConstantInitializer(Context)) 2429 return false; 2430 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 2431 << Init->getSourceRange(); 2432 return true; 2433} 2434 2435void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 2436 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 2437} 2438 2439/// AddInitializerToDecl - Adds the initializer Init to the 2440/// declaration dcl. If DirectInit is true, this is C++ direct 2441/// initialization rather than copy initialization. 2442void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 2443 Decl *RealDecl = dcl.getAs<Decl>(); 2444 // If there is no declaration, there was an error parsing it. Just ignore 2445 // the initializer. 2446 if (RealDecl == 0) 2447 return; 2448 2449 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 2450 // With declarators parsed the way they are, the parser cannot 2451 // distinguish between a normal initializer and a pure-specifier. 2452 // Thus this grotesque test. 2453 IntegerLiteral *IL; 2454 Expr *Init = static_cast<Expr *>(init.get()); 2455 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 2456 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 2457 if (Method->isVirtual()) { 2458 Method->setPure(); 2459 2460 // A class is abstract if at least one function is pure virtual. 2461 cast<CXXRecordDecl>(CurContext)->setAbstract(true); 2462 } else if (!Method->isInvalidDecl()) { 2463 Diag(Method->getLocation(), diag::err_non_virtual_pure) 2464 << Method->getDeclName() << Init->getSourceRange(); 2465 Method->setInvalidDecl(); 2466 } 2467 } else { 2468 Diag(Method->getLocation(), diag::err_member_function_initialization) 2469 << Method->getDeclName() << Init->getSourceRange(); 2470 Method->setInvalidDecl(); 2471 } 2472 return; 2473 } 2474 2475 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2476 if (!VDecl) { 2477 if (getLangOptions().CPlusPlus && 2478 RealDecl->getLexicalDeclContext()->isRecord() && 2479 isa<NamedDecl>(RealDecl)) 2480 Diag(RealDecl->getLocation(), diag::err_member_initialization) 2481 << cast<NamedDecl>(RealDecl)->getDeclName(); 2482 else 2483 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2484 RealDecl->setInvalidDecl(); 2485 return; 2486 } 2487 2488 if (!VDecl->getType()->isArrayType() && 2489 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2490 diag::err_typecheck_decl_incomplete_type)) { 2491 RealDecl->setInvalidDecl(); 2492 return; 2493 } 2494 2495 const VarDecl *Def = 0; 2496 if (VDecl->getDefinition(Def)) { 2497 Diag(VDecl->getLocation(), diag::err_redefinition) 2498 << VDecl->getDeclName(); 2499 Diag(Def->getLocation(), diag::note_previous_definition); 2500 VDecl->setInvalidDecl(); 2501 return; 2502 } 2503 2504 // Take ownership of the expression, now that we're sure we have somewhere 2505 // to put it. 2506 Expr *Init = static_cast<Expr *>(init.release()); 2507 assert(Init && "missing initializer"); 2508 2509 // Get the decls type and save a reference for later, since 2510 // CheckInitializerTypes may change it. 2511 QualType DclT = VDecl->getType(), SavT = DclT; 2512 if (VDecl->isBlockVarDecl()) { 2513 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 2514 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2515 VDecl->setInvalidDecl(); 2516 } else if (!VDecl->isInvalidDecl()) { 2517 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2518 VDecl->getDeclName(), DirectInit)) 2519 VDecl->setInvalidDecl(); 2520 2521 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2522 // Don't check invalid declarations to avoid emitting useless diagnostics. 2523 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2524 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 2525 CheckForConstantInitializer(Init, DclT); 2526 } 2527 } 2528 } else if (VDecl->isStaticDataMember() && 2529 VDecl->getLexicalDeclContext()->isRecord()) { 2530 // This is an in-class initialization for a static data member, e.g., 2531 // 2532 // struct S { 2533 // static const int value = 17; 2534 // }; 2535 2536 // Attach the initializer 2537 VDecl->setInit(Init); 2538 2539 // C++ [class.mem]p4: 2540 // A member-declarator can contain a constant-initializer only 2541 // if it declares a static member (9.4) of const integral or 2542 // const enumeration type, see 9.4.2. 2543 QualType T = VDecl->getType(); 2544 if (!T->isDependentType() && 2545 (!Context.getCanonicalType(T).isConstQualified() || 2546 !T->isIntegralType())) { 2547 Diag(VDecl->getLocation(), diag::err_member_initialization) 2548 << VDecl->getDeclName() << Init->getSourceRange(); 2549 VDecl->setInvalidDecl(); 2550 } else { 2551 // C++ [class.static.data]p4: 2552 // If a static data member is of const integral or const 2553 // enumeration type, its declaration in the class definition 2554 // can specify a constant-initializer which shall be an 2555 // integral constant expression (5.19). 2556 if (!Init->isTypeDependent() && 2557 !Init->getType()->isIntegralType()) { 2558 // We have a non-dependent, non-integral or enumeration type. 2559 Diag(Init->getSourceRange().getBegin(), 2560 diag::err_in_class_initializer_non_integral_type) 2561 << Init->getType() << Init->getSourceRange(); 2562 VDecl->setInvalidDecl(); 2563 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 2564 // Check whether the expression is a constant expression. 2565 llvm::APSInt Value; 2566 SourceLocation Loc; 2567 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 2568 Diag(Loc, diag::err_in_class_initializer_non_constant) 2569 << Init->getSourceRange(); 2570 VDecl->setInvalidDecl(); 2571 } else if (!VDecl->getType()->isDependentType()) 2572 ImpCastExprToType(Init, VDecl->getType()); 2573 } 2574 } 2575 } else if (VDecl->isFileVarDecl()) { 2576 if (VDecl->getStorageClass() == VarDecl::Extern) 2577 Diag(VDecl->getLocation(), diag::warn_extern_init); 2578 if (!VDecl->isInvalidDecl()) 2579 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2580 VDecl->getDeclName(), DirectInit)) 2581 VDecl->setInvalidDecl(); 2582 2583 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2584 // Don't check invalid declarations to avoid emitting useless diagnostics. 2585 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2586 // C99 6.7.8p4. All file scoped initializers need to be constant. 2587 CheckForConstantInitializer(Init, DclT); 2588 } 2589 } 2590 // If the type changed, it means we had an incomplete type that was 2591 // completed by the initializer. For example: 2592 // int ary[] = { 1, 3, 5 }; 2593 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2594 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2595 VDecl->setType(DclT); 2596 Init->setType(DclT); 2597 } 2598 2599 // Attach the initializer to the decl. 2600 VDecl->setInit(Init); 2601 2602 // If the previous declaration of VDecl was a tentative definition, 2603 // remove it from the set of tentative definitions. 2604 if (VDecl->getPreviousDeclaration() && 2605 VDecl->getPreviousDeclaration()->isTentativeDefinition(Context)) { 2606 llvm::DenseMap<DeclarationName, VarDecl *>::iterator Pos 2607 = TentativeDefinitions.find(VDecl->getDeclName()); 2608 assert(Pos != TentativeDefinitions.end() && 2609 "Unrecorded tentative definition?"); 2610 TentativeDefinitions.erase(Pos); 2611 } 2612 2613 return; 2614} 2615 2616void Sema::ActOnUninitializedDecl(DeclPtrTy dcl) { 2617 Decl *RealDecl = dcl.getAs<Decl>(); 2618 2619 // If there is no declaration, there was an error parsing it. Just ignore it. 2620 if (RealDecl == 0) 2621 return; 2622 2623 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2624 QualType Type = Var->getType(); 2625 2626 // Record tentative definitions. 2627 if (Var->isTentativeDefinition(Context)) 2628 TentativeDefinitions[Var->getDeclName()] = Var; 2629 2630 // C++ [dcl.init.ref]p3: 2631 // The initializer can be omitted for a reference only in a 2632 // parameter declaration (8.3.5), in the declaration of a 2633 // function return type, in the declaration of a class member 2634 // within its class declaration (9.2), and where the extern 2635 // specifier is explicitly used. 2636 if (Type->isReferenceType() && !Var->hasExternalStorage()) { 2637 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2638 << Var->getDeclName() 2639 << SourceRange(Var->getLocation(), Var->getLocation()); 2640 Var->setInvalidDecl(); 2641 return; 2642 } 2643 2644 // C++ [dcl.init]p9: 2645 // 2646 // If no initializer is specified for an object, and the object 2647 // is of (possibly cv-qualified) non-POD class type (or array 2648 // thereof), the object shall be default-initialized; if the 2649 // object is of const-qualified type, the underlying class type 2650 // shall have a user-declared default constructor. 2651 if (getLangOptions().CPlusPlus) { 2652 QualType InitType = Type; 2653 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2654 InitType = Array->getElementType(); 2655 if (!Var->hasExternalStorage() && InitType->isRecordType()) { 2656 CXXRecordDecl *RD = 2657 cast<CXXRecordDecl>(InitType->getAsRecordType()->getDecl()); 2658 CXXConstructorDecl *Constructor = 0; 2659 if (!RequireCompleteType(Var->getLocation(), InitType, 2660 diag::err_invalid_incomplete_type_use)) 2661 Constructor 2662 = PerformInitializationByConstructor(InitType, 0, 0, 2663 Var->getLocation(), 2664 SourceRange(Var->getLocation(), 2665 Var->getLocation()), 2666 Var->getDeclName(), 2667 IK_Default); 2668 if (!Constructor) 2669 Var->setInvalidDecl(); 2670 else if (!RD->hasTrivialConstructor()) 2671 InitializeVarWithConstructor(Var, Constructor, InitType, 0, 0); 2672 } 2673 } 2674 2675#if 0 2676 // FIXME: Temporarily disabled because we are not properly parsing 2677 // linkage specifications on declarations, e.g., 2678 // 2679 // extern "C" const CGPoint CGPointerZero; 2680 // 2681 // C++ [dcl.init]p9: 2682 // 2683 // If no initializer is specified for an object, and the 2684 // object is of (possibly cv-qualified) non-POD class type (or 2685 // array thereof), the object shall be default-initialized; if 2686 // the object is of const-qualified type, the underlying class 2687 // type shall have a user-declared default 2688 // constructor. Otherwise, if no initializer is specified for 2689 // an object, the object and its subobjects, if any, have an 2690 // indeterminate initial value; if the object or any of its 2691 // subobjects are of const-qualified type, the program is 2692 // ill-formed. 2693 // 2694 // This isn't technically an error in C, so we don't diagnose it. 2695 // 2696 // FIXME: Actually perform the POD/user-defined default 2697 // constructor check. 2698 if (getLangOptions().CPlusPlus && 2699 Context.getCanonicalType(Type).isConstQualified() && 2700 !Var->hasExternalStorage()) 2701 Diag(Var->getLocation(), diag::err_const_var_requires_init) 2702 << Var->getName() 2703 << SourceRange(Var->getLocation(), Var->getLocation()); 2704#endif 2705 } 2706} 2707 2708Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, DeclPtrTy *Group, 2709 unsigned NumDecls) { 2710 llvm::SmallVector<Decl*, 8> Decls; 2711 2712 for (unsigned i = 0; i != NumDecls; ++i) 2713 if (Decl *D = Group[i].getAs<Decl>()) 2714 Decls.push_back(D); 2715 2716 // Perform semantic analysis that depends on having fully processed both 2717 // the declarator and initializer. 2718 for (unsigned i = 0, e = Decls.size(); i != e; ++i) { 2719 VarDecl *IDecl = dyn_cast<VarDecl>(Decls[i]); 2720 if (!IDecl) 2721 continue; 2722 QualType T = IDecl->getType(); 2723 2724 // Block scope. C99 6.7p7: If an identifier for an object is declared with 2725 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 2726 if (IDecl->isBlockVarDecl() && !IDecl->hasExternalStorage()) { 2727 if (!IDecl->isInvalidDecl() && 2728 RequireCompleteType(IDecl->getLocation(), T, 2729 diag::err_typecheck_decl_incomplete_type)) 2730 IDecl->setInvalidDecl(); 2731 } 2732 // File scope. C99 6.9.2p2: A declaration of an identifier for and 2733 // object that has file scope without an initializer, and without a 2734 // storage-class specifier or with the storage-class specifier "static", 2735 // constitutes a tentative definition. Note: A tentative definition with 2736 // external linkage is valid (C99 6.2.2p5). 2737 if (IDecl->isTentativeDefinition(Context)) { 2738 QualType CheckType = T; 2739 unsigned DiagID = diag::err_typecheck_decl_incomplete_type; 2740 2741 const IncompleteArrayType *ArrayT = Context.getAsIncompleteArrayType(T); 2742 if (ArrayT) { 2743 CheckType = ArrayT->getElementType(); 2744 DiagID = diag::err_illegal_decl_array_incomplete_type; 2745 } 2746 2747 if (IDecl->isInvalidDecl()) { 2748 // Do nothing with invalid declarations 2749 } else if ((ArrayT || IDecl->getStorageClass() == VarDecl::Static) && 2750 RequireCompleteType(IDecl->getLocation(), CheckType, DiagID)) { 2751 // C99 6.9.2p3: If the declaration of an identifier for an object is 2752 // a tentative definition and has internal linkage (C99 6.2.2p3), the 2753 // declared type shall not be an incomplete type. 2754 IDecl->setInvalidDecl(); 2755 } 2756 } 2757 } 2758 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 2759 &Decls[0], Decls.size())); 2760} 2761 2762 2763/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 2764/// to introduce parameters into function prototype scope. 2765Sema::DeclPtrTy 2766Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 2767 const DeclSpec &DS = D.getDeclSpec(); 2768 2769 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 2770 VarDecl::StorageClass StorageClass = VarDecl::None; 2771 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2772 StorageClass = VarDecl::Register; 2773 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2774 Diag(DS.getStorageClassSpecLoc(), 2775 diag::err_invalid_storage_class_in_func_decl); 2776 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2777 } 2778 2779 if (D.getDeclSpec().isThreadSpecified()) 2780 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2781 2782 DiagnoseFunctionSpecifiers(D); 2783 2784 // Check that there are no default arguments inside the type of this 2785 // parameter (C++ only). 2786 if (getLangOptions().CPlusPlus) 2787 CheckExtraCXXDefaultArguments(D); 2788 2789 // In this context, we *do not* check D.getInvalidType(). If the declarator 2790 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 2791 // though it will not reflect the user specified type. 2792 QualType parmDeclType = GetTypeForDeclarator(D, S); 2793 if (parmDeclType.isNull()) { 2794 D.setInvalidType(true); 2795 parmDeclType = Context.IntTy; 2796 } 2797 2798 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 2799 // Can this happen for params? We already checked that they don't conflict 2800 // among each other. Here they can only shadow globals, which is ok. 2801 IdentifierInfo *II = D.getIdentifier(); 2802 if (II) { 2803 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2804 if (PrevDecl->isTemplateParameter()) { 2805 // Maybe we will complain about the shadowed template parameter. 2806 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2807 // Just pretend that we didn't see the previous declaration. 2808 PrevDecl = 0; 2809 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 2810 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 2811 2812 // Recover by removing the name 2813 II = 0; 2814 D.SetIdentifier(0, D.getIdentifierLoc()); 2815 } 2816 } 2817 } 2818 2819 // Parameters can not be abstract class types. 2820 // For record types, this is done by the AbstractClassUsageDiagnoser once 2821 // the class has been completely parsed. 2822 if (!CurContext->isRecord() && 2823 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 2824 diag::err_abstract_type_in_decl, 2825 AbstractParamType)) 2826 D.setInvalidType(true); 2827 2828 QualType T = adjustParameterType(parmDeclType); 2829 2830 ParmVarDecl *New; 2831 if (T == parmDeclType) // parameter type did not need adjustment 2832 New = ParmVarDecl::Create(Context, CurContext, 2833 D.getIdentifierLoc(), II, 2834 parmDeclType, StorageClass, 2835 0); 2836 else // keep track of both the adjusted and unadjusted types 2837 New = OriginalParmVarDecl::Create(Context, CurContext, 2838 D.getIdentifierLoc(), II, T, 2839 parmDeclType, StorageClass, 0); 2840 2841 if (D.getInvalidType()) 2842 New->setInvalidDecl(); 2843 2844 // Parameter declarators cannot be interface types. All ObjC objects are 2845 // passed by reference. 2846 if (T->isObjCInterfaceType()) { 2847 Diag(D.getIdentifierLoc(), 2848 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 2849 New->setInvalidDecl(); 2850 } 2851 2852 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 2853 if (D.getCXXScopeSpec().isSet()) { 2854 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 2855 << D.getCXXScopeSpec().getRange(); 2856 New->setInvalidDecl(); 2857 } 2858 2859 // Add the parameter declaration into this scope. 2860 S->AddDecl(DeclPtrTy::make(New)); 2861 if (II) 2862 IdResolver.AddDecl(New); 2863 2864 ProcessDeclAttributes(New, D); 2865 return DeclPtrTy::make(New); 2866} 2867 2868void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 2869 SourceLocation LocAfterDecls) { 2870 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2871 "Not a function declarator!"); 2872 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2873 2874 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 2875 // for a K&R function. 2876 if (!FTI.hasPrototype) { 2877 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 2878 --i; 2879 if (FTI.ArgInfo[i].Param == 0) { 2880 std::string Code = " int "; 2881 Code += FTI.ArgInfo[i].Ident->getName(); 2882 Code += ";\n"; 2883 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 2884 << FTI.ArgInfo[i].Ident 2885 << CodeModificationHint::CreateInsertion(LocAfterDecls, Code); 2886 2887 // Implicitly declare the argument as type 'int' for lack of a better 2888 // type. 2889 DeclSpec DS; 2890 const char* PrevSpec; // unused 2891 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 2892 PrevSpec); 2893 Declarator ParamD(DS, Declarator::KNRTypeListContext); 2894 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 2895 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 2896 } 2897 } 2898 } 2899} 2900 2901Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 2902 Declarator &D) { 2903 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 2904 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2905 "Not a function declarator!"); 2906 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2907 2908 if (FTI.hasPrototype) { 2909 // FIXME: Diagnose arguments without names in C. 2910 } 2911 2912 Scope *ParentScope = FnBodyScope->getParent(); 2913 2914 DeclPtrTy DP = ActOnDeclarator(ParentScope, D, /*IsFunctionDefinition=*/true); 2915 return ActOnStartOfFunctionDef(FnBodyScope, DP); 2916} 2917 2918Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 2919 FunctionDecl *FD = cast<FunctionDecl>(D.getAs<Decl>()); 2920 2921 CurFunctionNeedsScopeChecking = false; 2922 2923 // See if this is a redefinition. 2924 const FunctionDecl *Definition; 2925 if (FD->getBody(Context, Definition)) { 2926 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 2927 Diag(Definition->getLocation(), diag::note_previous_definition); 2928 } 2929 2930 // Builtin functions cannot be defined. 2931 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 2932 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2933 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 2934 FD->setInvalidDecl(); 2935 } 2936 } 2937 2938 // The return type of a function definition must be complete 2939 // (C99 6.9.1p3, C++ [dcl.fct]p6). 2940 QualType ResultType = FD->getResultType(); 2941 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 2942 RequireCompleteType(FD->getLocation(), ResultType, 2943 diag::err_func_def_incomplete_result)) 2944 FD->setInvalidDecl(); 2945 2946 // GNU warning -Wmissing-prototypes: 2947 // Warn if a global function is defined without a previous 2948 // prototype declaration. This warning is issued even if the 2949 // definition itself provides a prototype. The aim is to detect 2950 // global functions that fail to be declared in header files. 2951 if (!FD->isInvalidDecl() && FD->isGlobal() && !isa<CXXMethodDecl>(FD) && 2952 !FD->isMain()) { 2953 bool MissingPrototype = true; 2954 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 2955 Prev; Prev = Prev->getPreviousDeclaration()) { 2956 // Ignore any declarations that occur in function or method 2957 // scope, because they aren't visible from the header. 2958 if (Prev->getDeclContext()->isFunctionOrMethod()) 2959 continue; 2960 2961 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 2962 break; 2963 } 2964 2965 if (MissingPrototype) 2966 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 2967 } 2968 2969 PushDeclContext(FnBodyScope, FD); 2970 2971 // Check the validity of our function parameters 2972 CheckParmsForFunctionDef(FD); 2973 2974 // Introduce our parameters into the function scope 2975 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 2976 ParmVarDecl *Param = FD->getParamDecl(p); 2977 Param->setOwningFunction(FD); 2978 2979 // If this has an identifier, add it to the scope stack. 2980 if (Param->getIdentifier()) 2981 PushOnScopeChains(Param, FnBodyScope); 2982 } 2983 2984 // Checking attributes of current function definition 2985 // dllimport attribute. 2986 if (FD->getAttr<DLLImportAttr>() && (!FD->getAttr<DLLExportAttr>())) { 2987 // dllimport attribute cannot be applied to definition. 2988 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 2989 Diag(FD->getLocation(), 2990 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 2991 << "dllimport"; 2992 FD->setInvalidDecl(); 2993 return DeclPtrTy::make(FD); 2994 } else { 2995 // If a symbol previously declared dllimport is later defined, the 2996 // attribute is ignored in subsequent references, and a warning is 2997 // emitted. 2998 Diag(FD->getLocation(), 2999 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 3000 << FD->getNameAsCString() << "dllimport"; 3001 } 3002 } 3003 return DeclPtrTy::make(FD); 3004} 3005 3006 3007Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 3008 Decl *dcl = D.getAs<Decl>(); 3009 CompoundStmt *Body =cast<CompoundStmt>(static_cast<Stmt*>(BodyArg.release())); 3010 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 3011 FD->setBody(Body); 3012 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 3013 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 3014 assert(MD == getCurMethodDecl() && "Method parsing confused"); 3015 MD->setBody(Body); 3016 } else { 3017 Body->Destroy(Context); 3018 return DeclPtrTy(); 3019 } 3020 PopDeclContext(); 3021 // Verify and clean out per-function state. 3022 3023 assert(&getLabelMap() == &FunctionLabelMap && "Didn't pop block right?"); 3024 3025 // Check goto/label use. 3026 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 3027 I = FunctionLabelMap.begin(), E = FunctionLabelMap.end(); I != E; ++I) { 3028 LabelStmt *L = I->second; 3029 3030 // Verify that we have no forward references left. If so, there was a goto 3031 // or address of a label taken, but no definition of it. Label fwd 3032 // definitions are indicated with a null substmt. 3033 if (L->getSubStmt() != 0) 3034 continue; 3035 3036 // Emit error. 3037 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 3038 3039 // At this point, we have gotos that use the bogus label. Stitch it into 3040 // the function body so that they aren't leaked and that the AST is well 3041 // formed. 3042 if (Body == 0) { 3043 // The whole function wasn't parsed correctly, just delete this. 3044 L->Destroy(Context); 3045 continue; 3046 } 3047 3048 // Otherwise, the body is valid: we want to stitch the label decl into the 3049 // function somewhere so that it is properly owned and so that the goto 3050 // has a valid target. Do this by creating a new compound stmt with the 3051 // label in it. 3052 3053 // Give the label a sub-statement. 3054 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 3055 3056 std::vector<Stmt*> Elements(Body->body_begin(), Body->body_end()); 3057 Elements.push_back(L); 3058 Body->setStmts(Context, &Elements[0], Elements.size()); 3059 } 3060 FunctionLabelMap.clear(); 3061 3062 if (!Body) return D; 3063 3064 // Verify that that gotos and switch cases don't jump into scopes illegally. 3065 if (CurFunctionNeedsScopeChecking) 3066 DiagnoseInvalidJumps(Body); 3067 3068 return D; 3069} 3070 3071/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 3072/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 3073NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 3074 IdentifierInfo &II, Scope *S) { 3075 // Before we produce a declaration for an implicitly defined 3076 // function, see whether there was a locally-scoped declaration of 3077 // this name as a function or variable. If so, use that 3078 // (non-visible) declaration, and complain about it. 3079 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3080 = LocallyScopedExternalDecls.find(&II); 3081 if (Pos != LocallyScopedExternalDecls.end()) { 3082 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 3083 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 3084 return Pos->second; 3085 } 3086 3087 // Extension in C99. Legal in C90, but warn about it. 3088 if (getLangOptions().C99) 3089 Diag(Loc, diag::ext_implicit_function_decl) << &II; 3090 else 3091 Diag(Loc, diag::warn_implicit_function_decl) << &II; 3092 3093 // FIXME: handle stuff like: 3094 // void foo() { extern float X(); } 3095 // void bar() { X(); } <-- implicit decl for X in another scope. 3096 3097 // Set a Declarator for the implicit definition: int foo(); 3098 const char *Dummy; 3099 DeclSpec DS; 3100 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 3101 Error = Error; // Silence warning. 3102 assert(!Error && "Error setting up implicit decl!"); 3103 Declarator D(DS, Declarator::BlockContext); 3104 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 3105 0, 0, 0, Loc, D), 3106 SourceLocation()); 3107 D.SetIdentifier(&II, Loc); 3108 3109 // Insert this function into translation-unit scope. 3110 3111 DeclContext *PrevDC = CurContext; 3112 CurContext = Context.getTranslationUnitDecl(); 3113 3114 FunctionDecl *FD = 3115 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D, DeclPtrTy()).getAs<Decl>()); 3116 FD->setImplicit(); 3117 3118 CurContext = PrevDC; 3119 3120 AddKnownFunctionAttributes(FD); 3121 3122 return FD; 3123} 3124 3125/// \brief Adds any function attributes that we know a priori based on 3126/// the declaration of this function. 3127/// 3128/// These attributes can apply both to implicitly-declared builtins 3129/// (like __builtin___printf_chk) or to library-declared functions 3130/// like NSLog or printf. 3131void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 3132 if (FD->isInvalidDecl()) 3133 return; 3134 3135 // If this is a built-in function, map its builtin attributes to 3136 // actual attributes. 3137 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 3138 // Handle printf-formatting attributes. 3139 unsigned FormatIdx; 3140 bool HasVAListArg; 3141 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 3142 if (!FD->getAttr<FormatAttr>()) 3143 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 3144 FormatIdx + 2)); 3145 } 3146 3147 // Mark const if we don't care about errno and that is the only 3148 // thing preventing the function from being const. This allows 3149 // IRgen to use LLVM intrinsics for such functions. 3150 if (!getLangOptions().MathErrno && 3151 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 3152 if (!FD->getAttr<ConstAttr>()) 3153 FD->addAttr(::new (Context) ConstAttr()); 3154 } 3155 } 3156 3157 IdentifierInfo *Name = FD->getIdentifier(); 3158 if (!Name) 3159 return; 3160 if ((!getLangOptions().CPlusPlus && 3161 FD->getDeclContext()->isTranslationUnit()) || 3162 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 3163 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 3164 LinkageSpecDecl::lang_c)) { 3165 // Okay: this could be a libc/libm/Objective-C function we know 3166 // about. 3167 } else 3168 return; 3169 3170 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 3171 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 3172 // FIXME: We known better than our headers. 3173 const_cast<FormatAttr *>(Format)->setType("printf"); 3174 } else 3175 FD->addAttr(::new (Context) FormatAttr("printf", 1, 2)); 3176 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 3177 if (!FD->getAttr<FormatAttr>()) 3178 FD->addAttr(::new (Context) FormatAttr("printf", 2, 3)); 3179 } 3180} 3181 3182TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T) { 3183 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 3184 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3185 3186 // Scope manipulation handled by caller. 3187 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 3188 D.getIdentifierLoc(), 3189 D.getIdentifier(), 3190 T); 3191 3192 if (TagType *TT = dyn_cast<TagType>(T)) { 3193 TagDecl *TD = TT->getDecl(); 3194 3195 // If the TagDecl that the TypedefDecl points to is an anonymous decl 3196 // keep track of the TypedefDecl. 3197 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 3198 TD->setTypedefForAnonDecl(NewTD); 3199 } 3200 3201 if (D.getInvalidType()) 3202 NewTD->setInvalidDecl(); 3203 return NewTD; 3204} 3205 3206/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 3207/// former case, Name will be non-null. In the later case, Name will be null. 3208/// TagSpec indicates what kind of tag this is. TK indicates whether this is a 3209/// reference/declaration/definition of a tag. 3210Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, 3211 SourceLocation KWLoc, const CXXScopeSpec &SS, 3212 IdentifierInfo *Name, SourceLocation NameLoc, 3213 AttributeList *Attr, AccessSpecifier AS) { 3214 // If this is not a definition, it must have a name. 3215 assert((Name != 0 || TK == TK_Definition) && 3216 "Nameless record must be a definition!"); 3217 3218 TagDecl::TagKind Kind; 3219 switch (TagSpec) { 3220 default: assert(0 && "Unknown tag type!"); 3221 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 3222 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 3223 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 3224 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 3225 } 3226 3227 DeclContext *SearchDC = CurContext; 3228 DeclContext *DC = CurContext; 3229 NamedDecl *PrevDecl = 0; 3230 3231 bool Invalid = false; 3232 3233 if (Name && SS.isNotEmpty()) { 3234 // We have a nested-name tag ('struct foo::bar'). 3235 3236 // Check for invalid 'foo::'. 3237 if (SS.isInvalid()) { 3238 Name = 0; 3239 goto CreateNewDecl; 3240 } 3241 3242 // FIXME: RequireCompleteDeclContext(SS)? 3243 DC = computeDeclContext(SS); 3244 SearchDC = DC; 3245 // Look-up name inside 'foo::'. 3246 PrevDecl = dyn_cast_or_null<TagDecl>( 3247 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 3248 3249 // A tag 'foo::bar' must already exist. 3250 if (PrevDecl == 0) { 3251 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 3252 Name = 0; 3253 goto CreateNewDecl; 3254 } 3255 } else if (Name) { 3256 // If this is a named struct, check to see if there was a previous forward 3257 // declaration or definition. 3258 // FIXME: We're looking into outer scopes here, even when we 3259 // shouldn't be. Doing so can result in ambiguities that we 3260 // shouldn't be diagnosing. 3261 LookupResult R = LookupName(S, Name, LookupTagName, 3262 /*RedeclarationOnly=*/(TK != TK_Reference)); 3263 if (R.isAmbiguous()) { 3264 DiagnoseAmbiguousLookup(R, Name, NameLoc); 3265 // FIXME: This is not best way to recover from case like: 3266 // 3267 // struct S s; 3268 // 3269 // causes needless "incomplete type" error later. 3270 Name = 0; 3271 PrevDecl = 0; 3272 Invalid = true; 3273 } 3274 else 3275 PrevDecl = R; 3276 3277 if (!getLangOptions().CPlusPlus && TK != TK_Reference) { 3278 // FIXME: This makes sure that we ignore the contexts associated 3279 // with C structs, unions, and enums when looking for a matching 3280 // tag declaration or definition. See the similar lookup tweak 3281 // in Sema::LookupName; is there a better way to deal with this? 3282 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 3283 SearchDC = SearchDC->getParent(); 3284 } 3285 } 3286 3287 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3288 // Maybe we will complain about the shadowed template parameter. 3289 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 3290 // Just pretend that we didn't see the previous declaration. 3291 PrevDecl = 0; 3292 } 3293 3294 if (PrevDecl) { 3295 // Check whether the previous declaration is usable. 3296 (void)DiagnoseUseOfDecl(PrevDecl, NameLoc); 3297 3298 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 3299 // If this is a use of a previous tag, or if the tag is already declared 3300 // in the same scope (so that the definition/declaration completes or 3301 // rementions the tag), reuse the decl. 3302 if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { 3303 // Make sure that this wasn't declared as an enum and now used as a 3304 // struct or something similar. 3305 if (PrevTagDecl->getTagKind() != Kind) { 3306 bool SafeToContinue 3307 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 3308 Kind != TagDecl::TK_enum); 3309 if (SafeToContinue) 3310 Diag(KWLoc, diag::err_use_with_wrong_tag) 3311 << Name 3312 << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), 3313 PrevTagDecl->getKindName()); 3314 else 3315 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 3316 Diag(PrevDecl->getLocation(), diag::note_previous_use); 3317 3318 if (SafeToContinue) 3319 Kind = PrevTagDecl->getTagKind(); 3320 else { 3321 // Recover by making this an anonymous redefinition. 3322 Name = 0; 3323 PrevDecl = 0; 3324 Invalid = true; 3325 } 3326 } 3327 3328 if (!Invalid) { 3329 // If this is a use, just return the declaration we found. 3330 3331 // FIXME: In the future, return a variant or some other clue 3332 // for the consumer of this Decl to know it doesn't own it. 3333 // For our current ASTs this shouldn't be a problem, but will 3334 // need to be changed with DeclGroups. 3335 if (TK == TK_Reference) 3336 return DeclPtrTy::make(PrevDecl); 3337 3338 // Diagnose attempts to redefine a tag. 3339 if (TK == TK_Definition) { 3340 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 3341 Diag(NameLoc, diag::err_redefinition) << Name; 3342 Diag(Def->getLocation(), diag::note_previous_definition); 3343 // If this is a redefinition, recover by making this 3344 // struct be anonymous, which will make any later 3345 // references get the previous definition. 3346 Name = 0; 3347 PrevDecl = 0; 3348 Invalid = true; 3349 } else { 3350 // If the type is currently being defined, complain 3351 // about a nested redefinition. 3352 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 3353 if (Tag->isBeingDefined()) { 3354 Diag(NameLoc, diag::err_nested_redefinition) << Name; 3355 Diag(PrevTagDecl->getLocation(), 3356 diag::note_previous_definition); 3357 Name = 0; 3358 PrevDecl = 0; 3359 Invalid = true; 3360 } 3361 } 3362 3363 // Okay, this is definition of a previously declared or referenced 3364 // tag PrevDecl. We're going to create a new Decl for it. 3365 } 3366 } 3367 // If we get here we have (another) forward declaration or we 3368 // have a definition. Just create a new decl. 3369 } else { 3370 // If we get here, this is a definition of a new tag type in a nested 3371 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 3372 // new decl/type. We set PrevDecl to NULL so that the entities 3373 // have distinct types. 3374 PrevDecl = 0; 3375 } 3376 // If we get here, we're going to create a new Decl. If PrevDecl 3377 // is non-NULL, it's a definition of the tag declared by 3378 // PrevDecl. If it's NULL, we have a new definition. 3379 } else { 3380 // PrevDecl is a namespace, template, or anything else 3381 // that lives in the IDNS_Tag identifier namespace. 3382 if (isDeclInScope(PrevDecl, SearchDC, S)) { 3383 // The tag name clashes with a namespace name, issue an error and 3384 // recover by making this tag be anonymous. 3385 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 3386 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3387 Name = 0; 3388 PrevDecl = 0; 3389 Invalid = true; 3390 } else { 3391 // The existing declaration isn't relevant to us; we're in a 3392 // new scope, so clear out the previous declaration. 3393 PrevDecl = 0; 3394 } 3395 } 3396 } else if (TK == TK_Reference && SS.isEmpty() && Name && 3397 (Kind != TagDecl::TK_enum || !getLangOptions().CPlusPlus)) { 3398 // C.scope.pdecl]p5: 3399 // -- for an elaborated-type-specifier of the form 3400 // 3401 // class-key identifier 3402 // 3403 // if the elaborated-type-specifier is used in the 3404 // decl-specifier-seq or parameter-declaration-clause of a 3405 // function defined in namespace scope, the identifier is 3406 // declared as a class-name in the namespace that contains 3407 // the declaration; otherwise, except as a friend 3408 // declaration, the identifier is declared in the smallest 3409 // non-class, non-function-prototype scope that contains the 3410 // declaration. 3411 // 3412 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 3413 // C structs and unions. 3414 // 3415 // GNU C also supports this behavior as part of its incomplete 3416 // enum types extension, while GNU C++ does not. 3417 // 3418 // Find the context where we'll be declaring the tag. 3419 // FIXME: We would like to maintain the current DeclContext as the 3420 // lexical context, 3421 while (SearchDC->isRecord()) 3422 SearchDC = SearchDC->getParent(); 3423 3424 // Find the scope where we'll be declaring the tag. 3425 while (S->isClassScope() || 3426 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 3427 ((S->getFlags() & Scope::DeclScope) == 0) || 3428 (S->getEntity() && 3429 ((DeclContext *)S->getEntity())->isTransparentContext())) 3430 S = S->getParent(); 3431 } 3432 3433CreateNewDecl: 3434 3435 // If there is an identifier, use the location of the identifier as the 3436 // location of the decl, otherwise use the location of the struct/union 3437 // keyword. 3438 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 3439 3440 // Otherwise, create a new declaration. If there is a previous 3441 // declaration of the same entity, the two will be linked via 3442 // PrevDecl. 3443 TagDecl *New; 3444 3445 if (Kind == TagDecl::TK_enum) { 3446 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3447 // enum X { A, B, C } D; D should chain to X. 3448 New = EnumDecl::Create(Context, SearchDC, Loc, Name, 3449 cast_or_null<EnumDecl>(PrevDecl)); 3450 // If this is an undefined enum, warn. 3451 if (TK != TK_Definition && !Invalid) { 3452 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 3453 : diag::ext_forward_ref_enum; 3454 Diag(Loc, DK); 3455 } 3456 } else { 3457 // struct/union/class 3458 3459 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3460 // struct X { int A; } D; D should chain to X. 3461 if (getLangOptions().CPlusPlus) 3462 // FIXME: Look for a way to use RecordDecl for simple structs. 3463 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3464 cast_or_null<CXXRecordDecl>(PrevDecl)); 3465 else 3466 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3467 cast_or_null<RecordDecl>(PrevDecl)); 3468 } 3469 3470 if (Kind != TagDecl::TK_enum) { 3471 // Handle #pragma pack: if the #pragma pack stack has non-default 3472 // alignment, make up a packed attribute for this decl. These 3473 // attributes are checked when the ASTContext lays out the 3474 // structure. 3475 // 3476 // It is important for implementing the correct semantics that this 3477 // happen here (in act on tag decl). The #pragma pack stack is 3478 // maintained as a result of parser callbacks which can occur at 3479 // many points during the parsing of a struct declaration (because 3480 // the #pragma tokens are effectively skipped over during the 3481 // parsing of the struct). 3482 if (unsigned Alignment = getPragmaPackAlignment()) 3483 New->addAttr(::new (Context) PackedAttr(Alignment * 8)); 3484 } 3485 3486 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 3487 // C++ [dcl.typedef]p3: 3488 // [...] Similarly, in a given scope, a class or enumeration 3489 // shall not be declared with the same name as a typedef-name 3490 // that is declared in that scope and refers to a type other 3491 // than the class or enumeration itself. 3492 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 3493 TypedefDecl *PrevTypedef = 0; 3494 if (Lookup.getKind() == LookupResult::Found) 3495 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 3496 3497 if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && 3498 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 3499 Context.getCanonicalType(Context.getTypeDeclType(New))) { 3500 Diag(Loc, diag::err_tag_definition_of_typedef) 3501 << Context.getTypeDeclType(New) 3502 << PrevTypedef->getUnderlyingType(); 3503 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 3504 Invalid = true; 3505 } 3506 } 3507 3508 if (Invalid) 3509 New->setInvalidDecl(); 3510 3511 if (Attr) 3512 ProcessDeclAttributeList(New, Attr); 3513 3514 // If we're declaring or defining a tag in function prototype scope 3515 // in C, note that this type can only be used within the function. 3516 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 3517 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 3518 3519 // Set the lexical context. If the tag has a C++ scope specifier, the 3520 // lexical context will be different from the semantic context. 3521 New->setLexicalDeclContext(CurContext); 3522 3523 // Set the access specifier. 3524 SetMemberAccessSpecifier(New, PrevDecl, AS); 3525 3526 if (TK == TK_Definition) 3527 New->startDefinition(); 3528 3529 // If this has an identifier, add it to the scope stack. 3530 if (Name) { 3531 S = getNonFieldDeclScope(S); 3532 PushOnScopeChains(New, S); 3533 } else { 3534 CurContext->addDecl(Context, New); 3535 } 3536 3537 return DeclPtrTy::make(New); 3538} 3539 3540void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 3541 AdjustDeclIfTemplate(TagD); 3542 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 3543 3544 // Enter the tag context. 3545 PushDeclContext(S, Tag); 3546 3547 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 3548 FieldCollector->StartClass(); 3549 3550 if (Record->getIdentifier()) { 3551 // C++ [class]p2: 3552 // [...] The class-name is also inserted into the scope of the 3553 // class itself; this is known as the injected-class-name. For 3554 // purposes of access checking, the injected-class-name is treated 3555 // as if it were a public member name. 3556 CXXRecordDecl *InjectedClassName 3557 = CXXRecordDecl::Create(Context, Record->getTagKind(), 3558 CurContext, Record->getLocation(), 3559 Record->getIdentifier(), Record); 3560 InjectedClassName->setImplicit(); 3561 InjectedClassName->setAccess(AS_public); 3562 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 3563 InjectedClassName->setDescribedClassTemplate(Template); 3564 PushOnScopeChains(InjectedClassName, S); 3565 assert(InjectedClassName->isInjectedClassName() && 3566 "Broken injected-class-name"); 3567 } 3568 } 3569} 3570 3571void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD) { 3572 AdjustDeclIfTemplate(TagD); 3573 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 3574 3575 if (isa<CXXRecordDecl>(Tag)) 3576 FieldCollector->FinishClass(); 3577 3578 // Exit this scope of this tag's definition. 3579 PopDeclContext(); 3580 3581 // Notify the consumer that we've defined a tag. 3582 Consumer.HandleTagDeclDefinition(Tag); 3583} 3584 3585// Note that FieldName may be null for anonymous bitfields. 3586bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 3587 QualType FieldTy, const Expr *BitWidth) { 3588 3589 // C99 6.7.2.1p4 - verify the field type. 3590 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 3591 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 3592 // Handle incomplete types with specific error. 3593 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 3594 return true; 3595 if (FieldName) 3596 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 3597 << FieldName << FieldTy << BitWidth->getSourceRange(); 3598 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 3599 << FieldTy << BitWidth->getSourceRange(); 3600 } 3601 3602 // If the bit-width is type- or value-dependent, don't try to check 3603 // it now. 3604 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 3605 return false; 3606 3607 llvm::APSInt Value; 3608 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 3609 return true; 3610 3611 // Zero-width bitfield is ok for anonymous field. 3612 if (Value == 0 && FieldName) 3613 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 3614 3615 if (Value.isSigned() && Value.isNegative()) { 3616 if (FieldName) 3617 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 3618 << FieldName << Value.toString(10); 3619 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 3620 << Value.toString(10); 3621 } 3622 3623 if (!FieldTy->isDependentType()) { 3624 uint64_t TypeSize = Context.getTypeSize(FieldTy); 3625 if (Value.getZExtValue() > TypeSize) { 3626 if (FieldName) 3627 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 3628 << FieldName << (unsigned)TypeSize; 3629 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 3630 << (unsigned)TypeSize; 3631 } 3632 } 3633 3634 return false; 3635} 3636 3637/// ActOnField - Each field of a struct/union/class is passed into this in order 3638/// to create a FieldDecl object for it. 3639Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 3640 SourceLocation DeclStart, 3641 Declarator &D, ExprTy *BitfieldWidth) { 3642 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 3643 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 3644 AS_public); 3645 return DeclPtrTy::make(Res); 3646} 3647 3648/// HandleField - Analyze a field of a C struct or a C++ data member. 3649/// 3650FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 3651 SourceLocation DeclStart, 3652 Declarator &D, Expr *BitWidth, 3653 AccessSpecifier AS) { 3654 IdentifierInfo *II = D.getIdentifier(); 3655 SourceLocation Loc = DeclStart; 3656 if (II) Loc = D.getIdentifierLoc(); 3657 3658 QualType T = GetTypeForDeclarator(D, S); 3659 if (getLangOptions().CPlusPlus) 3660 CheckExtraCXXDefaultArguments(D); 3661 3662 DiagnoseFunctionSpecifiers(D); 3663 3664 if (D.getDeclSpec().isThreadSpecified()) 3665 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3666 3667 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3668 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 3669 PrevDecl = 0; 3670 3671 FieldDecl *NewFD 3672 = CheckFieldDecl(II, T, Record, Loc, 3673 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable, 3674 BitWidth, AS, PrevDecl, &D); 3675 if (NewFD->isInvalidDecl() && PrevDecl) { 3676 // Don't introduce NewFD into scope; there's already something 3677 // with the same name in the same scope. 3678 } else if (II) { 3679 PushOnScopeChains(NewFD, S); 3680 } else 3681 Record->addDecl(Context, NewFD); 3682 3683 return NewFD; 3684} 3685 3686/// \brief Build a new FieldDecl and check its well-formedness. 3687/// 3688/// This routine builds a new FieldDecl given the fields name, type, 3689/// record, etc. \p PrevDecl should refer to any previous declaration 3690/// with the same name and in the same scope as the field to be 3691/// created. 3692/// 3693/// \returns a new FieldDecl. 3694/// 3695/// \todo The Declarator argument is a hack. It will be removed once 3696FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 3697 RecordDecl *Record, SourceLocation Loc, 3698 bool Mutable, Expr *BitWidth, 3699 AccessSpecifier AS, NamedDecl *PrevDecl, 3700 Declarator *D) { 3701 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3702 bool InvalidDecl = false; 3703 3704 // If we receive a broken type, recover by assuming 'int' and 3705 // marking this declaration as invalid. 3706 if (T.isNull()) { 3707 InvalidDecl = true; 3708 T = Context.IntTy; 3709 } 3710 3711 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3712 // than a variably modified type. 3713 if (T->isVariablyModifiedType()) { 3714 bool SizeIsNegative; 3715 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 3716 SizeIsNegative); 3717 if (!FixedTy.isNull()) { 3718 Diag(Loc, diag::warn_illegal_constant_array_size); 3719 T = FixedTy; 3720 } else { 3721 if (SizeIsNegative) 3722 Diag(Loc, diag::err_typecheck_negative_array_size); 3723 else 3724 Diag(Loc, diag::err_typecheck_field_variable_size); 3725 T = Context.IntTy; 3726 InvalidDecl = true; 3727 } 3728 } 3729 3730 // Fields can not have abstract class types 3731 if (RequireNonAbstractType(Loc, T, diag::err_abstract_type_in_decl, 3732 AbstractFieldType)) 3733 InvalidDecl = true; 3734 3735 // If this is declared as a bit-field, check the bit-field. 3736 if (BitWidth && VerifyBitField(Loc, II, T, BitWidth)) { 3737 InvalidDecl = true; 3738 DeleteExpr(BitWidth); 3739 BitWidth = 0; 3740 } 3741 3742 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, BitWidth, 3743 Mutable); 3744 3745 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 3746 Diag(Loc, diag::err_duplicate_member) << II; 3747 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3748 NewFD->setInvalidDecl(); 3749 Record->setInvalidDecl(); 3750 } 3751 3752 if (getLangOptions().CPlusPlus && !T->isPODType()) 3753 cast<CXXRecordDecl>(Record)->setPOD(false); 3754 3755 // FIXME: We need to pass in the attributes given an AST 3756 // representation, not a parser representation. 3757 if (D) 3758 ProcessDeclAttributes(NewFD, *D); 3759 3760 if (T.isObjCGCWeak()) 3761 Diag(Loc, diag::warn_attribute_weak_on_field); 3762 3763 if (InvalidDecl) 3764 NewFD->setInvalidDecl(); 3765 3766 NewFD->setAccess(AS); 3767 3768 // C++ [dcl.init.aggr]p1: 3769 // An aggregate is an array or a class (clause 9) with [...] no 3770 // private or protected non-static data members (clause 11). 3771 // A POD must be an aggregate. 3772 if (getLangOptions().CPlusPlus && 3773 (AS == AS_private || AS == AS_protected)) { 3774 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 3775 CXXRecord->setAggregate(false); 3776 CXXRecord->setPOD(false); 3777 } 3778 3779 return NewFD; 3780} 3781 3782/// TranslateIvarVisibility - Translate visibility from a token ID to an 3783/// AST enum value. 3784static ObjCIvarDecl::AccessControl 3785TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 3786 switch (ivarVisibility) { 3787 default: assert(0 && "Unknown visitibility kind"); 3788 case tok::objc_private: return ObjCIvarDecl::Private; 3789 case tok::objc_public: return ObjCIvarDecl::Public; 3790 case tok::objc_protected: return ObjCIvarDecl::Protected; 3791 case tok::objc_package: return ObjCIvarDecl::Package; 3792 } 3793} 3794 3795/// ActOnIvar - Each ivar field of an objective-c class is passed into this 3796/// in order to create an IvarDecl object for it. 3797Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 3798 SourceLocation DeclStart, 3799 Declarator &D, ExprTy *BitfieldWidth, 3800 tok::ObjCKeywordKind Visibility) { 3801 3802 IdentifierInfo *II = D.getIdentifier(); 3803 Expr *BitWidth = (Expr*)BitfieldWidth; 3804 SourceLocation Loc = DeclStart; 3805 if (II) Loc = D.getIdentifierLoc(); 3806 3807 // FIXME: Unnamed fields can be handled in various different ways, for 3808 // example, unnamed unions inject all members into the struct namespace! 3809 3810 QualType T = GetTypeForDeclarator(D, S); 3811 bool InvalidDecl = false; 3812 if (T.isNull()) { 3813 InvalidDecl = true; 3814 T = Context.IntTy; 3815 } 3816 3817 if (BitWidth) { 3818 // 6.7.2.1p3, 6.7.2.1p4 3819 if (VerifyBitField(Loc, II, T, BitWidth)) { 3820 InvalidDecl = true; 3821 DeleteExpr(BitWidth); 3822 BitWidth = 0; 3823 } 3824 } else { 3825 // Not a bitfield. 3826 3827 // validate II. 3828 3829 } 3830 3831 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3832 // than a variably modified type. 3833 if (T->isVariablyModifiedType()) { 3834 Diag(Loc, diag::err_typecheck_ivar_variable_size); 3835 InvalidDecl = true; 3836 } 3837 3838 // Get the visibility (access control) for this ivar. 3839 ObjCIvarDecl::AccessControl ac = 3840 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 3841 : ObjCIvarDecl::None; 3842 3843 // Construct the decl. 3844 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, CurContext, Loc, II, T,ac, 3845 (Expr *)BitfieldWidth); 3846 3847 if (II) { 3848 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3849 if (PrevDecl && isDeclInScope(PrevDecl, CurContext, S) 3850 && !isa<TagDecl>(PrevDecl)) { 3851 Diag(Loc, diag::err_duplicate_member) << II; 3852 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3853 NewID->setInvalidDecl(); 3854 } 3855 } 3856 3857 // Process attributes attached to the ivar. 3858 ProcessDeclAttributes(NewID, D); 3859 3860 if (D.getInvalidType() || InvalidDecl) 3861 NewID->setInvalidDecl(); 3862 3863 if (II) { 3864 // FIXME: When interfaces are DeclContexts, we'll need to add 3865 // these to the interface. 3866 S->AddDecl(DeclPtrTy::make(NewID)); 3867 IdResolver.AddDecl(NewID); 3868 } 3869 3870 return DeclPtrTy::make(NewID); 3871} 3872 3873void Sema::ActOnFields(Scope* S, 3874 SourceLocation RecLoc, DeclPtrTy RecDecl, 3875 DeclPtrTy *Fields, unsigned NumFields, 3876 SourceLocation LBrac, SourceLocation RBrac, 3877 AttributeList *Attr) { 3878 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 3879 assert(EnclosingDecl && "missing record or interface decl"); 3880 3881 // If the decl this is being inserted into is invalid, then it may be a 3882 // redeclaration or some other bogus case. Don't try to add fields to it. 3883 if (EnclosingDecl->isInvalidDecl()) { 3884 // FIXME: Deallocate fields? 3885 return; 3886 } 3887 3888 3889 // Verify that all the fields are okay. 3890 unsigned NumNamedMembers = 0; 3891 llvm::SmallVector<FieldDecl*, 32> RecFields; 3892 3893 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 3894 for (unsigned i = 0; i != NumFields; ++i) { 3895 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 3896 3897 // Get the type for the field. 3898 Type *FDTy = FD->getType().getTypePtr(); 3899 3900 if (!FD->isAnonymousStructOrUnion()) { 3901 // Remember all fields written by the user. 3902 RecFields.push_back(FD); 3903 } 3904 3905 // If the field is already invalid for some reason, don't emit more 3906 // diagnostics about it. 3907 if (FD->isInvalidDecl()) 3908 continue; 3909 3910 // C99 6.7.2.1p2: 3911 // A structure or union shall not contain a member with 3912 // incomplete or function type (hence, a structure shall not 3913 // contain an instance of itself, but may contain a pointer to 3914 // an instance of itself), except that the last member of a 3915 // structure with more than one named member may have incomplete 3916 // array type; such a structure (and any union containing, 3917 // possibly recursively, a member that is such a structure) 3918 // shall not be a member of a structure or an element of an 3919 // array. 3920 if (FDTy->isFunctionType()) { 3921 // Field declared as a function. 3922 Diag(FD->getLocation(), diag::err_field_declared_as_function) 3923 << FD->getDeclName(); 3924 FD->setInvalidDecl(); 3925 EnclosingDecl->setInvalidDecl(); 3926 continue; 3927 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 3928 Record && Record->isStruct()) { 3929 // Flexible array member. 3930 if (NumNamedMembers < 1) { 3931 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 3932 << FD->getDeclName(); 3933 FD->setInvalidDecl(); 3934 EnclosingDecl->setInvalidDecl(); 3935 continue; 3936 } 3937 // Okay, we have a legal flexible array member at the end of the struct. 3938 if (Record) 3939 Record->setHasFlexibleArrayMember(true); 3940 } else if (!FDTy->isDependentType() && 3941 RequireCompleteType(FD->getLocation(), FD->getType(), 3942 diag::err_field_incomplete)) { 3943 // Incomplete type 3944 FD->setInvalidDecl(); 3945 EnclosingDecl->setInvalidDecl(); 3946 continue; 3947 } else if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 3948 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 3949 // If this is a member of a union, then entire union becomes "flexible". 3950 if (Record && Record->isUnion()) { 3951 Record->setHasFlexibleArrayMember(true); 3952 } else { 3953 // If this is a struct/class and this is not the last element, reject 3954 // it. Note that GCC supports variable sized arrays in the middle of 3955 // structures. 3956 if (i != NumFields-1) 3957 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 3958 << FD->getDeclName(); 3959 else { 3960 // We support flexible arrays at the end of structs in 3961 // other structs as an extension. 3962 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 3963 << FD->getDeclName(); 3964 if (Record) 3965 Record->setHasFlexibleArrayMember(true); 3966 } 3967 } 3968 } 3969 } else if (FDTy->isObjCInterfaceType()) { 3970 /// A field cannot be an Objective-c object 3971 Diag(FD->getLocation(), diag::err_statically_allocated_object); 3972 FD->setInvalidDecl(); 3973 EnclosingDecl->setInvalidDecl(); 3974 continue; 3975 } 3976 // Keep track of the number of named members. 3977 if (FD->getIdentifier()) 3978 ++NumNamedMembers; 3979 } 3980 3981 // Okay, we successfully defined 'Record'. 3982 if (Record) { 3983 Record->completeDefinition(Context); 3984 } else { 3985 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 3986 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 3987 ID->setIVarList(ClsFields, RecFields.size(), Context); 3988 ID->setLocEnd(RBrac); 3989 3990 // Must enforce the rule that ivars in the base classes may not be 3991 // duplicates. 3992 if (ID->getSuperClass()) { 3993 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 3994 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 3995 ObjCIvarDecl* Ivar = (*IVI); 3996 IdentifierInfo *II = Ivar->getIdentifier(); 3997 ObjCIvarDecl* prevIvar = 3998 ID->getSuperClass()->lookupInstanceVariable(Context, II); 3999 if (prevIvar) { 4000 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 4001 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 4002 } 4003 } 4004 } 4005 } else if (ObjCImplementationDecl *IMPDecl = 4006 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 4007 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 4008 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) { 4009 // FIXME: Set the DeclContext correctly when we build the 4010 // declarations. 4011 ClsFields[I]->setLexicalDeclContext(IMPDecl); 4012 IMPDecl->addDecl(Context, ClsFields[I]); 4013 } 4014 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 4015 } 4016 } 4017 4018 if (Attr) 4019 ProcessDeclAttributeList(Record, Attr); 4020} 4021 4022EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 4023 EnumConstantDecl *LastEnumConst, 4024 SourceLocation IdLoc, 4025 IdentifierInfo *Id, 4026 ExprArg val) { 4027 Expr *Val = (Expr *)val.get(); 4028 4029 llvm::APSInt EnumVal(32); 4030 QualType EltTy; 4031 if (Val && !Val->isTypeDependent()) { 4032 // Make sure to promote the operand type to int. 4033 UsualUnaryConversions(Val); 4034 if (Val != val.get()) { 4035 val.release(); 4036 val = Val; 4037 } 4038 4039 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 4040 SourceLocation ExpLoc; 4041 if (!Val->isValueDependent() && 4042 VerifyIntegerConstantExpression(Val, &EnumVal)) { 4043 Val = 0; 4044 } else { 4045 EltTy = Val->getType(); 4046 } 4047 } 4048 4049 if (!Val) { 4050 if (LastEnumConst) { 4051 // Assign the last value + 1. 4052 EnumVal = LastEnumConst->getInitVal(); 4053 ++EnumVal; 4054 4055 // Check for overflow on increment. 4056 if (EnumVal < LastEnumConst->getInitVal()) 4057 Diag(IdLoc, diag::warn_enum_value_overflow); 4058 4059 EltTy = LastEnumConst->getType(); 4060 } else { 4061 // First value, set to zero. 4062 EltTy = Context.IntTy; 4063 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 4064 } 4065 } 4066 4067 val.release(); 4068 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 4069 Val, EnumVal); 4070} 4071 4072 4073Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 4074 DeclPtrTy lastEnumConst, 4075 SourceLocation IdLoc, 4076 IdentifierInfo *Id, 4077 SourceLocation EqualLoc, ExprTy *val) { 4078 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 4079 EnumConstantDecl *LastEnumConst = 4080 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 4081 Expr *Val = static_cast<Expr*>(val); 4082 4083 // The scope passed in may not be a decl scope. Zip up the scope tree until 4084 // we find one that is. 4085 S = getNonFieldDeclScope(S); 4086 4087 // Verify that there isn't already something declared with this name in this 4088 // scope. 4089 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 4090 if (PrevDecl && PrevDecl->isTemplateParameter()) { 4091 // Maybe we will complain about the shadowed template parameter. 4092 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 4093 // Just pretend that we didn't see the previous declaration. 4094 PrevDecl = 0; 4095 } 4096 4097 if (PrevDecl) { 4098 // When in C++, we may get a TagDecl with the same name; in this case the 4099 // enum constant will 'hide' the tag. 4100 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 4101 "Received TagDecl when not in C++!"); 4102 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 4103 if (isa<EnumConstantDecl>(PrevDecl)) 4104 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 4105 else 4106 Diag(IdLoc, diag::err_redefinition) << Id; 4107 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4108 if (Val) Val->Destroy(Context); 4109 return DeclPtrTy(); 4110 } 4111 } 4112 4113 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 4114 IdLoc, Id, Owned(Val)); 4115 4116 // Register this decl in the current scope stack. 4117 if (New) 4118 PushOnScopeChains(New, S); 4119 4120 return DeclPtrTy::make(New); 4121} 4122 4123// FIXME: For consistency with ActOnFields(), we should have the parser 4124// pass in the source location for the left/right braces. 4125void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclPtrTy EnumDeclX, 4126 DeclPtrTy *Elements, unsigned NumElements) { 4127 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 4128 QualType EnumType = Context.getTypeDeclType(Enum); 4129 4130 // TODO: If the result value doesn't fit in an int, it must be a long or long 4131 // long value. ISO C does not support this, but GCC does as an extension, 4132 // emit a warning. 4133 unsigned IntWidth = Context.Target.getIntWidth(); 4134 4135 // Verify that all the values are okay, compute the size of the values, and 4136 // reverse the list. 4137 unsigned NumNegativeBits = 0; 4138 unsigned NumPositiveBits = 0; 4139 4140 // Keep track of whether all elements have type int. 4141 bool AllElementsInt = true; 4142 4143 for (unsigned i = 0; i != NumElements; ++i) { 4144 EnumConstantDecl *ECD = 4145 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 4146 if (!ECD) continue; // Already issued a diagnostic. 4147 4148 // If the enum value doesn't fit in an int, emit an extension warning. 4149 const llvm::APSInt &InitVal = ECD->getInitVal(); 4150 assert(InitVal.getBitWidth() >= IntWidth && 4151 "Should have promoted value to int"); 4152 if (InitVal.getBitWidth() > IntWidth) { 4153 llvm::APSInt V(InitVal); 4154 V.trunc(IntWidth); 4155 V.extend(InitVal.getBitWidth()); 4156 if (V != InitVal) 4157 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 4158 << InitVal.toString(10); 4159 } 4160 4161 // Keep track of the size of positive and negative values. 4162 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 4163 NumPositiveBits = std::max(NumPositiveBits, 4164 (unsigned)InitVal.getActiveBits()); 4165 else 4166 NumNegativeBits = std::max(NumNegativeBits, 4167 (unsigned)InitVal.getMinSignedBits()); 4168 4169 // Keep track of whether every enum element has type int (very commmon). 4170 if (AllElementsInt) 4171 AllElementsInt = ECD->getType() == Context.IntTy; 4172 } 4173 4174 // Figure out the type that should be used for this enum. 4175 // FIXME: Support attribute(packed) on enums and -fshort-enums. 4176 QualType BestType; 4177 unsigned BestWidth; 4178 4179 if (NumNegativeBits) { 4180 // If there is a negative value, figure out the smallest integer type (of 4181 // int/long/longlong) that fits. 4182 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 4183 BestType = Context.IntTy; 4184 BestWidth = IntWidth; 4185 } else { 4186 BestWidth = Context.Target.getLongWidth(); 4187 4188 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 4189 BestType = Context.LongTy; 4190 else { 4191 BestWidth = Context.Target.getLongLongWidth(); 4192 4193 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 4194 Diag(Enum->getLocation(), diag::warn_enum_too_large); 4195 BestType = Context.LongLongTy; 4196 } 4197 } 4198 } else { 4199 // If there is no negative value, figure out which of uint, ulong, ulonglong 4200 // fits. 4201 if (NumPositiveBits <= IntWidth) { 4202 BestType = Context.UnsignedIntTy; 4203 BestWidth = IntWidth; 4204 } else if (NumPositiveBits <= 4205 (BestWidth = Context.Target.getLongWidth())) { 4206 BestType = Context.UnsignedLongTy; 4207 } else { 4208 BestWidth = Context.Target.getLongLongWidth(); 4209 assert(NumPositiveBits <= BestWidth && 4210 "How could an initializer get larger than ULL?"); 4211 BestType = Context.UnsignedLongLongTy; 4212 } 4213 } 4214 4215 // Loop over all of the enumerator constants, changing their types to match 4216 // the type of the enum if needed. 4217 for (unsigned i = 0; i != NumElements; ++i) { 4218 EnumConstantDecl *ECD = 4219 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 4220 if (!ECD) continue; // Already issued a diagnostic. 4221 4222 // Standard C says the enumerators have int type, but we allow, as an 4223 // extension, the enumerators to be larger than int size. If each 4224 // enumerator value fits in an int, type it as an int, otherwise type it the 4225 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 4226 // that X has type 'int', not 'unsigned'. 4227 if (ECD->getType() == Context.IntTy) { 4228 // Make sure the init value is signed. 4229 llvm::APSInt IV = ECD->getInitVal(); 4230 IV.setIsSigned(true); 4231 ECD->setInitVal(IV); 4232 4233 if (getLangOptions().CPlusPlus) 4234 // C++ [dcl.enum]p4: Following the closing brace of an 4235 // enum-specifier, each enumerator has the type of its 4236 // enumeration. 4237 ECD->setType(EnumType); 4238 continue; // Already int type. 4239 } 4240 4241 // Determine whether the value fits into an int. 4242 llvm::APSInt InitVal = ECD->getInitVal(); 4243 bool FitsInInt; 4244 if (InitVal.isUnsigned() || !InitVal.isNegative()) 4245 FitsInInt = InitVal.getActiveBits() < IntWidth; 4246 else 4247 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 4248 4249 // If it fits into an integer type, force it. Otherwise force it to match 4250 // the enum decl type. 4251 QualType NewTy; 4252 unsigned NewWidth; 4253 bool NewSign; 4254 if (FitsInInt) { 4255 NewTy = Context.IntTy; 4256 NewWidth = IntWidth; 4257 NewSign = true; 4258 } else if (ECD->getType() == BestType) { 4259 // Already the right type! 4260 if (getLangOptions().CPlusPlus) 4261 // C++ [dcl.enum]p4: Following the closing brace of an 4262 // enum-specifier, each enumerator has the type of its 4263 // enumeration. 4264 ECD->setType(EnumType); 4265 continue; 4266 } else { 4267 NewTy = BestType; 4268 NewWidth = BestWidth; 4269 NewSign = BestType->isSignedIntegerType(); 4270 } 4271 4272 // Adjust the APSInt value. 4273 InitVal.extOrTrunc(NewWidth); 4274 InitVal.setIsSigned(NewSign); 4275 ECD->setInitVal(InitVal); 4276 4277 // Adjust the Expr initializer and type. 4278 if (ECD->getInitExpr()) 4279 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), 4280 /*isLvalue=*/false)); 4281 if (getLangOptions().CPlusPlus) 4282 // C++ [dcl.enum]p4: Following the closing brace of an 4283 // enum-specifier, each enumerator has the type of its 4284 // enumeration. 4285 ECD->setType(EnumType); 4286 else 4287 ECD->setType(NewTy); 4288 } 4289 4290 Enum->completeDefinition(Context, BestType); 4291} 4292 4293Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 4294 ExprArg expr) { 4295 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr.release()); 4296 4297 return DeclPtrTy::make(FileScopeAsmDecl::Create(Context, CurContext, 4298 Loc, AsmString)); 4299} 4300 4301