SemaDecl.cpp revision 8499f3f5ff8d5f95ece8047780030a3daad1b6fa
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 DiagnoseAmbiguousLookup(Result, DeclarationName(&II), NameLoc); 85 return 0; 86 87 case LookupResult::Found: 88 IIDecl = Result.getAsDecl(); 89 break; 90 } 91 92 if (IIDecl) { 93 QualType T; 94 95 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 96 // Check whether we can use this type 97 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 98 99 T = Context.getTypeDeclType(TD); 100 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 101 // Check whether we can use this interface. 102 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 103 104 T = Context.getObjCInterfaceType(IDecl); 105 } else 106 return 0; 107 108 if (SS) 109 T = getQualifiedNameType(*SS, T); 110 111 return T.getAsOpaquePtr(); 112 } 113 114 return 0; 115} 116 117DeclContext *Sema::getContainingDC(DeclContext *DC) { 118 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) { 119 // A C++ out-of-line method will return to the file declaration context. 120 if (MD->isOutOfLineDefinition()) 121 return MD->getLexicalDeclContext(); 122 123 // A C++ inline method is parsed *after* the topmost class it was declared 124 // in is fully parsed (it's "complete"). 125 // The parsing of a C++ inline method happens at the declaration context of 126 // the topmost (non-nested) class it is lexically declared in. 127 assert(isa<CXXRecordDecl>(MD->getParent()) && "C++ method not in Record."); 128 DC = MD->getParent(); 129 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 130 DC = RD; 131 132 // Return the declaration context of the topmost class the inline method is 133 // declared in. 134 return DC; 135 } 136 137 if (isa<ObjCMethodDecl>(DC)) 138 return Context.getTranslationUnitDecl(); 139 140 return DC->getLexicalParent(); 141} 142 143void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 144 assert(getContainingDC(DC) == CurContext && 145 "The next DeclContext should be lexically contained in the current one."); 146 CurContext = DC; 147 S->setEntity(DC); 148} 149 150void Sema::PopDeclContext() { 151 assert(CurContext && "DeclContext imbalance!"); 152 153 CurContext = getContainingDC(CurContext); 154} 155 156/// \brief Determine whether we allow overloading of the function 157/// PrevDecl with another declaration. 158/// 159/// This routine determines whether overloading is possible, not 160/// whether some new function is actually an overload. It will return 161/// true in C++ (where we can always provide overloads) or, as an 162/// extension, in C when the previous function is already an 163/// overloaded function declaration or has the "overloadable" 164/// attribute. 165static bool AllowOverloadingOfFunction(Decl *PrevDecl, ASTContext &Context) { 166 if (Context.getLangOptions().CPlusPlus) 167 return true; 168 169 if (isa<OverloadedFunctionDecl>(PrevDecl)) 170 return true; 171 172 return PrevDecl->getAttr<OverloadableAttr>() != 0; 173} 174 175/// Add this decl to the scope shadowed decl chains. 176void Sema::PushOnScopeChains(NamedDecl *D, Scope *S) { 177 // Move up the scope chain until we find the nearest enclosing 178 // non-transparent context. The declaration will be introduced into this 179 // scope. 180 while (S->getEntity() && 181 ((DeclContext *)S->getEntity())->isTransparentContext()) 182 S = S->getParent(); 183 184 S->AddDecl(DeclPtrTy::make(D)); 185 186 // Add scoped declarations into their context, so that they can be 187 // found later. Declarations without a context won't be inserted 188 // into any context. 189 CurContext->addDecl(D); 190 191 // C++ [basic.scope]p4: 192 // -- exactly one declaration shall declare a class name or 193 // enumeration name that is not a typedef name and the other 194 // declarations shall all refer to the same object or 195 // enumerator, or all refer to functions and function templates; 196 // in this case the class name or enumeration name is hidden. 197 if (TagDecl *TD = dyn_cast<TagDecl>(D)) { 198 // We are pushing the name of a tag (enum or class). 199 if (CurContext->getLookupContext() 200 == TD->getDeclContext()->getLookupContext()) { 201 // We're pushing the tag into the current context, which might 202 // require some reshuffling in the identifier resolver. 203 IdentifierResolver::iterator 204 I = IdResolver.begin(TD->getDeclName()), 205 IEnd = IdResolver.end(); 206 if (I != IEnd && isDeclInScope(*I, CurContext, S)) { 207 NamedDecl *PrevDecl = *I; 208 for (; I != IEnd && isDeclInScope(*I, CurContext, S); 209 PrevDecl = *I, ++I) { 210 if (TD->declarationReplaces(*I)) { 211 // This is a redeclaration. Remove it from the chain and 212 // break out, so that we'll add in the shadowed 213 // declaration. 214 S->RemoveDecl(DeclPtrTy::make(*I)); 215 if (PrevDecl == *I) { 216 IdResolver.RemoveDecl(*I); 217 IdResolver.AddDecl(TD); 218 return; 219 } else { 220 IdResolver.RemoveDecl(*I); 221 break; 222 } 223 } 224 } 225 226 // There is already a declaration with the same name in the same 227 // scope, which is not a tag declaration. It must be found 228 // before we find the new declaration, so insert the new 229 // declaration at the end of the chain. 230 IdResolver.AddShadowedDecl(TD, PrevDecl); 231 232 return; 233 } 234 } 235 } else if (isa<FunctionDecl>(D) && 236 AllowOverloadingOfFunction(D, Context)) { 237 // We are pushing the name of a function, which might be an 238 // overloaded name. 239 FunctionDecl *FD = cast<FunctionDecl>(D); 240 IdentifierResolver::iterator Redecl 241 = std::find_if(IdResolver.begin(FD->getDeclName()), 242 IdResolver.end(), 243 std::bind1st(std::mem_fun(&NamedDecl::declarationReplaces), 244 FD)); 245 if (Redecl != IdResolver.end() && 246 S->isDeclScope(DeclPtrTy::make(*Redecl))) { 247 // There is already a declaration of a function on our 248 // IdResolver chain. Replace it with this declaration. 249 S->RemoveDecl(DeclPtrTy::make(*Redecl)); 250 IdResolver.RemoveDecl(*Redecl); 251 } 252 } 253 254 IdResolver.AddDecl(D); 255} 256 257void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 258 if (S->decl_empty()) return; 259 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 260 "Scope shouldn't contain decls!"); 261 262 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 263 I != E; ++I) { 264 Decl *TmpD = (*I).getAs<Decl>(); 265 assert(TmpD && "This decl didn't get pushed??"); 266 267 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 268 NamedDecl *D = cast<NamedDecl>(TmpD); 269 270 if (!D->getDeclName()) continue; 271 272 // Remove this name from our lexical scope. 273 IdResolver.RemoveDecl(D); 274 } 275} 276 277/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 278/// return 0 if one not found. 279ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 280 // The third "scope" argument is 0 since we aren't enabling lazy built-in 281 // creation from this context. 282 NamedDecl *IDecl = LookupName(TUScope, Id, LookupOrdinaryName); 283 284 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 285} 286 287/// getNonFieldDeclScope - Retrieves the innermost scope, starting 288/// from S, where a non-field would be declared. This routine copes 289/// with the difference between C and C++ scoping rules in structs and 290/// unions. For example, the following code is well-formed in C but 291/// ill-formed in C++: 292/// @code 293/// struct S6 { 294/// enum { BAR } e; 295/// }; 296/// 297/// void test_S6() { 298/// struct S6 a; 299/// a.e = BAR; 300/// } 301/// @endcode 302/// For the declaration of BAR, this routine will return a different 303/// scope. The scope S will be the scope of the unnamed enumeration 304/// within S6. In C++, this routine will return the scope associated 305/// with S6, because the enumeration's scope is a transparent 306/// context but structures can contain non-field names. In C, this 307/// routine will return the translation unit scope, since the 308/// enumeration's scope is a transparent context and structures cannot 309/// contain non-field names. 310Scope *Sema::getNonFieldDeclScope(Scope *S) { 311 while (((S->getFlags() & Scope::DeclScope) == 0) || 312 (S->getEntity() && 313 ((DeclContext *)S->getEntity())->isTransparentContext()) || 314 (S->isClassScope() && !getLangOptions().CPlusPlus)) 315 S = S->getParent(); 316 return S; 317} 318 319void Sema::InitBuiltinVaListType() { 320 if (!Context.getBuiltinVaListType().isNull()) 321 return; 322 323 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 324 NamedDecl *VaDecl = LookupName(TUScope, VaIdent, LookupOrdinaryName); 325 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 326 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 327} 328 329/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 330/// file scope. lazily create a decl for it. ForRedeclaration is true 331/// if we're creating this built-in in anticipation of redeclaring the 332/// built-in. 333NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 334 Scope *S, bool ForRedeclaration, 335 SourceLocation Loc) { 336 Builtin::ID BID = (Builtin::ID)bid; 337 338 if (Context.BuiltinInfo.hasVAListUse(BID)) 339 InitBuiltinVaListType(); 340 341 Builtin::Context::GetBuiltinTypeError Error; 342 QualType R = Context.BuiltinInfo.GetBuiltinType(BID, Context, Error); 343 switch (Error) { 344 case Builtin::Context::GE_None: 345 // Okay 346 break; 347 348 case Builtin::Context::GE_Missing_FILE: 349 if (ForRedeclaration) 350 Diag(Loc, diag::err_implicit_decl_requires_stdio) 351 << Context.BuiltinInfo.GetName(BID); 352 return 0; 353 } 354 355 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 356 Diag(Loc, diag::ext_implicit_lib_function_decl) 357 << Context.BuiltinInfo.GetName(BID) 358 << R; 359 if (Context.BuiltinInfo.getHeaderName(BID) && 360 Diags.getDiagnosticMapping(diag::ext_implicit_lib_function_decl) 361 != diag::MAP_IGNORE) 362 Diag(Loc, diag::note_please_include_header) 363 << Context.BuiltinInfo.getHeaderName(BID) 364 << Context.BuiltinInfo.GetName(BID); 365 } 366 367 FunctionDecl *New = FunctionDecl::Create(Context, 368 Context.getTranslationUnitDecl(), 369 Loc, II, R, 370 FunctionDecl::Extern, false, 371 /*hasPrototype=*/true); 372 New->setImplicit(); 373 374 // Create Decl objects for each parameter, adding them to the 375 // FunctionDecl. 376 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 377 llvm::SmallVector<ParmVarDecl*, 16> Params; 378 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 379 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 380 FT->getArgType(i), VarDecl::None, 0)); 381 New->setParams(Context, &Params[0], Params.size()); 382 } 383 384 AddKnownFunctionAttributes(New); 385 386 // TUScope is the translation-unit scope to insert this function into. 387 // FIXME: This is hideous. We need to teach PushOnScopeChains to 388 // relate Scopes to DeclContexts, and probably eliminate CurContext 389 // entirely, but we're not there yet. 390 DeclContext *SavedContext = CurContext; 391 CurContext = Context.getTranslationUnitDecl(); 392 PushOnScopeChains(New, TUScope); 393 CurContext = SavedContext; 394 return New; 395} 396 397/// GetStdNamespace - This method gets the C++ "std" namespace. This is where 398/// everything from the standard library is defined. 399NamespaceDecl *Sema::GetStdNamespace() { 400 if (!StdNamespace) { 401 IdentifierInfo *StdIdent = &PP.getIdentifierTable().get("std"); 402 DeclContext *Global = Context.getTranslationUnitDecl(); 403 Decl *Std = LookupQualifiedName(Global, StdIdent, LookupNamespaceName); 404 StdNamespace = dyn_cast_or_null<NamespaceDecl>(Std); 405 } 406 return StdNamespace; 407} 408 409/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 410/// same name and scope as a previous declaration 'Old'. Figure out 411/// how to resolve this situation, merging decls or emitting 412/// diagnostics as appropriate. Returns true if there was an error, 413/// false otherwise. 414/// 415bool Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 416 bool objc_types = false; 417 // Allow multiple definitions for ObjC built-in typedefs. 418 // FIXME: Verify the underlying types are equivalent! 419 if (getLangOptions().ObjC1) { 420 const IdentifierInfo *TypeID = New->getIdentifier(); 421 switch (TypeID->getLength()) { 422 default: break; 423 case 2: 424 if (!TypeID->isStr("id")) 425 break; 426 Context.setObjCIdType(New); 427 objc_types = true; 428 break; 429 case 5: 430 if (!TypeID->isStr("Class")) 431 break; 432 Context.setObjCClassType(New); 433 objc_types = true; 434 return false; 435 case 3: 436 if (!TypeID->isStr("SEL")) 437 break; 438 Context.setObjCSelType(New); 439 objc_types = true; 440 return false; 441 case 8: 442 if (!TypeID->isStr("Protocol")) 443 break; 444 Context.setObjCProtoType(New->getUnderlyingType()); 445 objc_types = true; 446 return false; 447 } 448 // Fall through - the typedef name was not a builtin type. 449 } 450 // Verify the old decl was also a type. 451 TypeDecl *Old = dyn_cast<TypeDecl>(OldD); 452 if (!Old) { 453 Diag(New->getLocation(), diag::err_redefinition_different_kind) 454 << New->getDeclName(); 455 if (!objc_types) 456 Diag(OldD->getLocation(), diag::note_previous_definition); 457 return true; 458 } 459 460 // Determine the "old" type we'll use for checking and diagnostics. 461 QualType OldType; 462 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 463 OldType = OldTypedef->getUnderlyingType(); 464 else 465 OldType = Context.getTypeDeclType(Old); 466 467 // If the typedef types are not identical, reject them in all languages and 468 // with any extensions enabled. 469 470 if (OldType != New->getUnderlyingType() && 471 Context.getCanonicalType(OldType) != 472 Context.getCanonicalType(New->getUnderlyingType())) { 473 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 474 << New->getUnderlyingType() << OldType; 475 if (!objc_types) 476 Diag(Old->getLocation(), diag::note_previous_definition); 477 return true; 478 } 479 if (objc_types) return false; 480 if (getLangOptions().Microsoft) return false; 481 482 // C++ [dcl.typedef]p2: 483 // In a given non-class scope, a typedef specifier can be used to 484 // redefine the name of any type declared in that scope to refer 485 // to the type to which it already refers. 486 if (getLangOptions().CPlusPlus && !isa<CXXRecordDecl>(CurContext)) 487 return false; 488 489 // In C, redeclaration of a type is a constraint violation (6.7.2.3p1). 490 // Apparently GCC, Intel, and Sun all silently ignore the redeclaration if 491 // *either* declaration is in a system header. The code below implements 492 // this adhoc compatibility rule. FIXME: The following code will not 493 // work properly when compiling ".i" files (containing preprocessed output). 494 if (PP.getDiagnostics().getSuppressSystemWarnings()) { 495 SourceManager &SrcMgr = Context.getSourceManager(); 496 if (SrcMgr.isInSystemHeader(Old->getLocation())) 497 return false; 498 if (SrcMgr.isInSystemHeader(New->getLocation())) 499 return false; 500 } 501 502 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 503 Diag(Old->getLocation(), diag::note_previous_definition); 504 return true; 505} 506 507/// DeclhasAttr - returns true if decl Declaration already has the target 508/// attribute. 509static bool DeclHasAttr(const Decl *decl, const Attr *target) { 510 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 511 if (attr->getKind() == target->getKind()) 512 return true; 513 514 return false; 515} 516 517/// MergeAttributes - append attributes from the Old decl to the New one. 518static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 519 Attr *attr = const_cast<Attr*>(Old->getAttrs()); 520 521 while (attr) { 522 Attr *tmp = attr; 523 attr = attr->getNext(); 524 525 if (!DeclHasAttr(New, tmp) && tmp->isMerged()) { 526 tmp->setInherited(true); 527 New->addAttr(tmp); 528 } else { 529 tmp->setNext(0); 530 tmp->Destroy(C); 531 } 532 } 533 534 Old->invalidateAttrs(); 535} 536 537/// Used in MergeFunctionDecl to keep track of function parameters in 538/// C. 539struct GNUCompatibleParamWarning { 540 ParmVarDecl *OldParm; 541 ParmVarDecl *NewParm; 542 QualType PromotedType; 543}; 544 545/// MergeFunctionDecl - We just parsed a function 'New' from 546/// declarator D which has the same name and scope as a previous 547/// declaration 'Old'. Figure out how to resolve this situation, 548/// merging decls or emitting diagnostics as appropriate. 549/// 550/// In C++, New and Old must be declarations that are not 551/// overloaded. Use IsOverload to determine whether New and Old are 552/// overloaded, and to select the Old declaration that New should be 553/// merged with. 554/// 555/// Returns true if there was an error, false otherwise. 556bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 557 assert(!isa<OverloadedFunctionDecl>(OldD) && 558 "Cannot merge with an overloaded function declaration"); 559 560 // Verify the old decl was also a function. 561 FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); 562 if (!Old) { 563 Diag(New->getLocation(), diag::err_redefinition_different_kind) 564 << New->getDeclName(); 565 Diag(OldD->getLocation(), diag::note_previous_definition); 566 return true; 567 } 568 569 // Determine whether the previous declaration was a definition, 570 // implicit declaration, or a declaration. 571 diag::kind PrevDiag; 572 if (Old->isThisDeclarationADefinition()) 573 PrevDiag = diag::note_previous_definition; 574 else if (Old->isImplicit()) 575 PrevDiag = diag::note_previous_implicit_declaration; 576 else 577 PrevDiag = diag::note_previous_declaration; 578 579 QualType OldQType = Context.getCanonicalType(Old->getType()); 580 QualType NewQType = Context.getCanonicalType(New->getType()); 581 582 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 583 New->getStorageClass() == FunctionDecl::Static && 584 Old->getStorageClass() != FunctionDecl::Static) { 585 Diag(New->getLocation(), diag::err_static_non_static) 586 << New; 587 Diag(Old->getLocation(), PrevDiag); 588 return true; 589 } 590 591 if (getLangOptions().CPlusPlus) { 592 // (C++98 13.1p2): 593 // Certain function declarations cannot be overloaded: 594 // -- Function declarations that differ only in the return type 595 // cannot be overloaded. 596 QualType OldReturnType 597 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 598 QualType NewReturnType 599 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 600 if (OldReturnType != NewReturnType) { 601 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 602 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 603 return true; 604 } 605 606 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 607 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 608 if (OldMethod && NewMethod && 609 OldMethod->getLexicalDeclContext() == 610 NewMethod->getLexicalDeclContext()) { 611 // -- Member function declarations with the same name and the 612 // same parameter types cannot be overloaded if any of them 613 // is a static member function declaration. 614 if (OldMethod->isStatic() || NewMethod->isStatic()) { 615 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 616 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 617 return true; 618 } 619 620 // C++ [class.mem]p1: 621 // [...] A member shall not be declared twice in the 622 // member-specification, except that a nested class or member 623 // class template can be declared and then later defined. 624 unsigned NewDiag; 625 if (isa<CXXConstructorDecl>(OldMethod)) 626 NewDiag = diag::err_constructor_redeclared; 627 else if (isa<CXXDestructorDecl>(NewMethod)) 628 NewDiag = diag::err_destructor_redeclared; 629 else if (isa<CXXConversionDecl>(NewMethod)) 630 NewDiag = diag::err_conv_function_redeclared; 631 else 632 NewDiag = diag::err_member_redeclared; 633 634 Diag(New->getLocation(), NewDiag); 635 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 636 } 637 638 // (C++98 8.3.5p3): 639 // All declarations for a function shall agree exactly in both the 640 // return type and the parameter-type-list. 641 if (OldQType == NewQType) 642 return MergeCompatibleFunctionDecls(New, Old); 643 644 // Fall through for conflicting redeclarations and redefinitions. 645 } 646 647 // C: Function types need to be compatible, not identical. This handles 648 // duplicate function decls like "void f(int); void f(enum X);" properly. 649 if (!getLangOptions().CPlusPlus && 650 Context.typesAreCompatible(OldQType, NewQType)) { 651 const FunctionType *OldFuncType = OldQType->getAsFunctionType(); 652 const FunctionType *NewFuncType = NewQType->getAsFunctionType(); 653 const FunctionProtoType *OldProto = 0; 654 if (isa<FunctionNoProtoType>(NewFuncType) && 655 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 656 // The old declaration provided a function prototype, but the 657 // new declaration does not. Merge in the prototype. 658 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 659 OldProto->arg_type_end()); 660 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 661 &ParamTypes[0], ParamTypes.size(), 662 OldProto->isVariadic(), 663 OldProto->getTypeQuals()); 664 New->setType(NewQType); 665 New->setInheritedPrototype(); 666 667 // Synthesize a parameter for each argument type. 668 llvm::SmallVector<ParmVarDecl*, 16> Params; 669 for (FunctionProtoType::arg_type_iterator 670 ParamType = OldProto->arg_type_begin(), 671 ParamEnd = OldProto->arg_type_end(); 672 ParamType != ParamEnd; ++ParamType) { 673 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 674 SourceLocation(), 0, 675 *ParamType, VarDecl::None, 676 0); 677 Param->setImplicit(); 678 Params.push_back(Param); 679 } 680 681 New->setParams(Context, &Params[0], Params.size()); 682 } 683 684 return MergeCompatibleFunctionDecls(New, Old); 685 } 686 687 // GNU C permits a K&R definition to follow a prototype declaration 688 // if the declared types of the parameters in the K&R definition 689 // match the types in the prototype declaration, even when the 690 // promoted types of the parameters from the K&R definition differ 691 // from the types in the prototype. GCC then keeps the types from 692 // the prototype. 693 if (!getLangOptions().CPlusPlus && 694 !getLangOptions().NoExtensions && 695 Old->hasPrototype() && !New->hasPrototype() && 696 New->getType()->getAsFunctionProtoType() && 697 Old->getNumParams() == New->getNumParams()) { 698 llvm::SmallVector<QualType, 16> ArgTypes; 699 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 700 const FunctionProtoType *OldProto 701 = Old->getType()->getAsFunctionProtoType(); 702 const FunctionProtoType *NewProto 703 = New->getType()->getAsFunctionProtoType(); 704 705 // Determine whether this is the GNU C extension. 706 bool GNUCompatible = 707 Context.typesAreCompatible(OldProto->getResultType(), 708 NewProto->getResultType()) && 709 (OldProto->isVariadic() == NewProto->isVariadic()); 710 for (unsigned Idx = 0, End = Old->getNumParams(); 711 GNUCompatible && Idx != End; ++Idx) { 712 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 713 ParmVarDecl *NewParm = New->getParamDecl(Idx); 714 if (Context.typesAreCompatible(OldParm->getType(), 715 NewProto->getArgType(Idx))) { 716 ArgTypes.push_back(NewParm->getType()); 717 } else if (Context.typesAreCompatible(OldParm->getType(), 718 NewParm->getType())) { 719 GNUCompatibleParamWarning Warn 720 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 721 Warnings.push_back(Warn); 722 ArgTypes.push_back(NewParm->getType()); 723 } else 724 GNUCompatible = false; 725 } 726 727 if (GNUCompatible) { 728 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 729 Diag(Warnings[Warn].NewParm->getLocation(), 730 diag::ext_param_promoted_not_compatible_with_prototype) 731 << Warnings[Warn].PromotedType 732 << Warnings[Warn].OldParm->getType(); 733 Diag(Warnings[Warn].OldParm->getLocation(), 734 diag::note_previous_declaration); 735 } 736 737 New->setType(Context.getFunctionType(NewProto->getResultType(), 738 &ArgTypes[0], ArgTypes.size(), 739 NewProto->isVariadic(), 740 NewProto->getTypeQuals())); 741 return MergeCompatibleFunctionDecls(New, Old); 742 } 743 744 // Fall through to diagnose conflicting types. 745 } 746 747 // A function that has already been declared has been redeclared or defined 748 // with a different type- show appropriate diagnostic 749 if (unsigned BuiltinID = Old->getBuiltinID(Context)) { 750 // The user has declared a builtin function with an incompatible 751 // signature. 752 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 753 // The function the user is redeclaring is a library-defined 754 // function like 'malloc' or 'printf'. Warn about the 755 // redeclaration, then pretend that we don't know about this 756 // library built-in. 757 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 758 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 759 << Old << Old->getType(); 760 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 761 Old->setInvalidDecl(); 762 return false; 763 } 764 765 PrevDiag = diag::note_previous_builtin_declaration; 766 } 767 768 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 769 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 770 return true; 771} 772 773/// \brief Completes the merge of two function declarations that are 774/// known to be compatible. 775/// 776/// This routine handles the merging of attributes and other 777/// properties of function declarations form the old declaration to 778/// the new declaration, once we know that New is in fact a 779/// redeclaration of Old. 780/// 781/// \returns false 782bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 783 // Merge the attributes 784 MergeAttributes(New, Old, Context); 785 786 // Merge the storage class. 787 New->setStorageClass(Old->getStorageClass()); 788 789 // FIXME: need to implement inline semantics 790 791 // Merge "pure" flag. 792 if (Old->isPure()) 793 New->setPure(); 794 795 // Merge the "deleted" flag. 796 if (Old->isDeleted()) 797 New->setDeleted(); 798 799 if (getLangOptions().CPlusPlus) 800 return MergeCXXFunctionDecl(New, Old); 801 802 return false; 803} 804 805/// MergeVarDecl - We just parsed a variable 'New' which has the same name 806/// and scope as a previous declaration 'Old'. Figure out how to resolve this 807/// situation, merging decls or emitting diagnostics as appropriate. 808/// 809/// Tentative definition rules (C99 6.9.2p2) are checked by 810/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 811/// definitions here, since the initializer hasn't been attached. 812/// 813bool Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 814 // Verify the old decl was also a variable. 815 VarDecl *Old = dyn_cast<VarDecl>(OldD); 816 if (!Old) { 817 Diag(New->getLocation(), diag::err_redefinition_different_kind) 818 << New->getDeclName(); 819 Diag(OldD->getLocation(), diag::note_previous_definition); 820 return true; 821 } 822 823 MergeAttributes(New, Old, Context); 824 825 // Merge the types 826 QualType MergedT = Context.mergeTypes(New->getType(), Old->getType()); 827 if (MergedT.isNull()) { 828 Diag(New->getLocation(), diag::err_redefinition_different_type) 829 << New->getDeclName(); 830 Diag(Old->getLocation(), diag::note_previous_definition); 831 return true; 832 } 833 New->setType(MergedT); 834 835 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 836 if (New->getStorageClass() == VarDecl::Static && 837 (Old->getStorageClass() == VarDecl::None || 838 Old->getStorageClass() == VarDecl::Extern)) { 839 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 840 Diag(Old->getLocation(), diag::note_previous_definition); 841 return true; 842 } 843 // C99 6.2.2p4: 844 // For an identifier declared with the storage-class specifier 845 // extern in a scope in which a prior declaration of that 846 // identifier is visible,23) if the prior declaration specifies 847 // internal or external linkage, the linkage of the identifier at 848 // the later declaration is the same as the linkage specified at 849 // the prior declaration. If no prior declaration is visible, or 850 // if the prior declaration specifies no linkage, then the 851 // identifier has external linkage. 852 if (New->hasExternalStorage() && Old->hasLinkage()) 853 /* Okay */; 854 else if (New->getStorageClass() != VarDecl::Static && 855 Old->getStorageClass() == VarDecl::Static) { 856 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 857 Diag(Old->getLocation(), diag::note_previous_definition); 858 return true; 859 } 860 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 861 if (New->getStorageClass() != VarDecl::Extern && !New->isFileVarDecl() && 862 // Don't complain about out-of-line definitions of static members. 863 !(Old->getLexicalDeclContext()->isRecord() && 864 !New->getLexicalDeclContext()->isRecord())) { 865 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 866 Diag(Old->getLocation(), diag::note_previous_definition); 867 return true; 868 } 869 870 // Keep a chain of previous declarations. 871 New->setPreviousDeclaration(Old); 872 873 return false; 874} 875 876/// CheckParmsForFunctionDef - Check that the parameters of the given 877/// function are appropriate for the definition of a function. This 878/// takes care of any checks that cannot be performed on the 879/// declaration itself, e.g., that the types of each of the function 880/// parameters are complete. 881bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 882 bool HasInvalidParm = false; 883 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 884 ParmVarDecl *Param = FD->getParamDecl(p); 885 886 // C99 6.7.5.3p4: the parameters in a parameter type list in a 887 // function declarator that is part of a function definition of 888 // that function shall not have incomplete type. 889 // 890 // This is also C++ [dcl.fct]p6. 891 if (!Param->isInvalidDecl() && 892 RequireCompleteType(Param->getLocation(), Param->getType(), 893 diag::err_typecheck_decl_incomplete_type)) { 894 Param->setInvalidDecl(); 895 HasInvalidParm = true; 896 } 897 898 // C99 6.9.1p5: If the declarator includes a parameter type list, the 899 // declaration of each parameter shall include an identifier. 900 if (Param->getIdentifier() == 0 && 901 !Param->isImplicit() && 902 !getLangOptions().CPlusPlus) 903 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 904 } 905 906 return HasInvalidParm; 907} 908 909/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 910/// no declarator (e.g. "struct foo;") is parsed. 911Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 912 TagDecl *Tag = 0; 913 if (DS.getTypeSpecType() == DeclSpec::TST_class || 914 DS.getTypeSpecType() == DeclSpec::TST_struct || 915 DS.getTypeSpecType() == DeclSpec::TST_union || 916 DS.getTypeSpecType() == DeclSpec::TST_enum) 917 Tag = dyn_cast<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 918 919 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 920 if (!Record->getDeclName() && Record->isDefinition() && 921 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 922 if (getLangOptions().CPlusPlus || 923 Record->getDeclContext()->isRecord()) 924 return BuildAnonymousStructOrUnion(S, DS, Record); 925 926 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 927 << DS.getSourceRange(); 928 } 929 930 // Microsoft allows unnamed struct/union fields. Don't complain 931 // about them. 932 // FIXME: Should we support Microsoft's extensions in this area? 933 if (Record->getDeclName() && getLangOptions().Microsoft) 934 return DeclPtrTy::make(Tag); 935 } 936 937 if (!DS.isMissingDeclaratorOk() && 938 DS.getTypeSpecType() != DeclSpec::TST_error) { 939 // Warn about typedefs of enums without names, since this is an 940 // extension in both Microsoft an GNU. 941 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 942 Tag && isa<EnumDecl>(Tag)) { 943 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 944 << DS.getSourceRange(); 945 return DeclPtrTy::make(Tag); 946 } 947 948 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 949 << DS.getSourceRange(); 950 return DeclPtrTy(); 951 } 952 953 return DeclPtrTy::make(Tag); 954} 955 956/// InjectAnonymousStructOrUnionMembers - Inject the members of the 957/// anonymous struct or union AnonRecord into the owning context Owner 958/// and scope S. This routine will be invoked just after we realize 959/// that an unnamed union or struct is actually an anonymous union or 960/// struct, e.g., 961/// 962/// @code 963/// union { 964/// int i; 965/// float f; 966/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 967/// // f into the surrounding scope.x 968/// @endcode 969/// 970/// This routine is recursive, injecting the names of nested anonymous 971/// structs/unions into the owning context and scope as well. 972bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 973 RecordDecl *AnonRecord) { 974 bool Invalid = false; 975 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 976 FEnd = AnonRecord->field_end(); 977 F != FEnd; ++F) { 978 if ((*F)->getDeclName()) { 979 NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 980 LookupOrdinaryName, true); 981 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 982 // C++ [class.union]p2: 983 // The names of the members of an anonymous union shall be 984 // distinct from the names of any other entity in the 985 // scope in which the anonymous union is declared. 986 unsigned diagKind 987 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 988 : diag::err_anonymous_struct_member_redecl; 989 Diag((*F)->getLocation(), diagKind) 990 << (*F)->getDeclName(); 991 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 992 Invalid = true; 993 } else { 994 // C++ [class.union]p2: 995 // For the purpose of name lookup, after the anonymous union 996 // definition, the members of the anonymous union are 997 // considered to have been defined in the scope in which the 998 // anonymous union is declared. 999 Owner->makeDeclVisibleInContext(*F); 1000 S->AddDecl(DeclPtrTy::make(*F)); 1001 IdResolver.AddDecl(*F); 1002 } 1003 } else if (const RecordType *InnerRecordType 1004 = (*F)->getType()->getAsRecordType()) { 1005 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1006 if (InnerRecord->isAnonymousStructOrUnion()) 1007 Invalid = Invalid || 1008 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1009 } 1010 } 1011 1012 return Invalid; 1013} 1014 1015/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1016/// anonymous structure or union. Anonymous unions are a C++ feature 1017/// (C++ [class.union]) and a GNU C extension; anonymous structures 1018/// are a GNU C and GNU C++ extension. 1019Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1020 RecordDecl *Record) { 1021 DeclContext *Owner = Record->getDeclContext(); 1022 1023 // Diagnose whether this anonymous struct/union is an extension. 1024 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1025 Diag(Record->getLocation(), diag::ext_anonymous_union); 1026 else if (!Record->isUnion()) 1027 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1028 1029 // C and C++ require different kinds of checks for anonymous 1030 // structs/unions. 1031 bool Invalid = false; 1032 if (getLangOptions().CPlusPlus) { 1033 const char* PrevSpec = 0; 1034 // C++ [class.union]p3: 1035 // Anonymous unions declared in a named namespace or in the 1036 // global namespace shall be declared static. 1037 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1038 (isa<TranslationUnitDecl>(Owner) || 1039 (isa<NamespaceDecl>(Owner) && 1040 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1041 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1042 Invalid = true; 1043 1044 // Recover by adding 'static'. 1045 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); 1046 } 1047 // C++ [class.union]p3: 1048 // A storage class is not allowed in a declaration of an 1049 // anonymous union in a class scope. 1050 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1051 isa<RecordDecl>(Owner)) { 1052 Diag(DS.getStorageClassSpecLoc(), 1053 diag::err_anonymous_union_with_storage_spec); 1054 Invalid = true; 1055 1056 // Recover by removing the storage specifier. 1057 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1058 PrevSpec); 1059 } 1060 1061 // C++ [class.union]p2: 1062 // The member-specification of an anonymous union shall only 1063 // define non-static data members. [Note: nested types and 1064 // functions cannot be declared within an anonymous union. ] 1065 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1066 MemEnd = Record->decls_end(); 1067 Mem != MemEnd; ++Mem) { 1068 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1069 // C++ [class.union]p3: 1070 // An anonymous union shall not have private or protected 1071 // members (clause 11). 1072 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1073 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1074 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1075 Invalid = true; 1076 } 1077 } else if ((*Mem)->isImplicit()) { 1078 // Any implicit members are fine. 1079 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1080 // This is a type that showed up in an 1081 // elaborated-type-specifier inside the anonymous struct or 1082 // union, but which actually declares a type outside of the 1083 // anonymous struct or union. It's okay. 1084 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1085 if (!MemRecord->isAnonymousStructOrUnion() && 1086 MemRecord->getDeclName()) { 1087 // This is a nested type declaration. 1088 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1089 << (int)Record->isUnion(); 1090 Invalid = true; 1091 } 1092 } else { 1093 // We have something that isn't a non-static data 1094 // member. Complain about it. 1095 unsigned DK = diag::err_anonymous_record_bad_member; 1096 if (isa<TypeDecl>(*Mem)) 1097 DK = diag::err_anonymous_record_with_type; 1098 else if (isa<FunctionDecl>(*Mem)) 1099 DK = diag::err_anonymous_record_with_function; 1100 else if (isa<VarDecl>(*Mem)) 1101 DK = diag::err_anonymous_record_with_static; 1102 Diag((*Mem)->getLocation(), DK) 1103 << (int)Record->isUnion(); 1104 Invalid = true; 1105 } 1106 } 1107 } 1108 1109 if (!Record->isUnion() && !Owner->isRecord()) { 1110 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1111 << (int)getLangOptions().CPlusPlus; 1112 Invalid = true; 1113 } 1114 1115 // Create a declaration for this anonymous struct/union. 1116 NamedDecl *Anon = 0; 1117 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1118 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1119 /*IdentifierInfo=*/0, 1120 Context.getTypeDeclType(Record), 1121 /*BitWidth=*/0, /*Mutable=*/false); 1122 Anon->setAccess(AS_public); 1123 if (getLangOptions().CPlusPlus) 1124 FieldCollector->Add(cast<FieldDecl>(Anon)); 1125 } else { 1126 VarDecl::StorageClass SC; 1127 switch (DS.getStorageClassSpec()) { 1128 default: assert(0 && "Unknown storage class!"); 1129 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1130 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1131 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1132 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1133 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1134 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1135 case DeclSpec::SCS_mutable: 1136 // mutable can only appear on non-static class members, so it's always 1137 // an error here 1138 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1139 Invalid = true; 1140 SC = VarDecl::None; 1141 break; 1142 } 1143 1144 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1145 /*IdentifierInfo=*/0, 1146 Context.getTypeDeclType(Record), 1147 SC, DS.getSourceRange().getBegin()); 1148 } 1149 Anon->setImplicit(); 1150 1151 // Add the anonymous struct/union object to the current 1152 // context. We'll be referencing this object when we refer to one of 1153 // its members. 1154 Owner->addDecl(Anon); 1155 1156 // Inject the members of the anonymous struct/union into the owning 1157 // context and into the identifier resolver chain for name lookup 1158 // purposes. 1159 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1160 Invalid = true; 1161 1162 // Mark this as an anonymous struct/union type. Note that we do not 1163 // do this until after we have already checked and injected the 1164 // members of this anonymous struct/union type, because otherwise 1165 // the members could be injected twice: once by DeclContext when it 1166 // builds its lookup table, and once by 1167 // InjectAnonymousStructOrUnionMembers. 1168 Record->setAnonymousStructOrUnion(true); 1169 1170 if (Invalid) 1171 Anon->setInvalidDecl(); 1172 1173 return DeclPtrTy::make(Anon); 1174} 1175 1176 1177/// GetNameForDeclarator - Determine the full declaration name for the 1178/// given Declarator. 1179DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1180 switch (D.getKind()) { 1181 case Declarator::DK_Abstract: 1182 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 1183 return DeclarationName(); 1184 1185 case Declarator::DK_Normal: 1186 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 1187 return DeclarationName(D.getIdentifier()); 1188 1189 case Declarator::DK_Constructor: { 1190 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1191 Ty = Context.getCanonicalType(Ty); 1192 return Context.DeclarationNames.getCXXConstructorName(Ty); 1193 } 1194 1195 case Declarator::DK_Destructor: { 1196 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1197 Ty = Context.getCanonicalType(Ty); 1198 return Context.DeclarationNames.getCXXDestructorName(Ty); 1199 } 1200 1201 case Declarator::DK_Conversion: { 1202 // FIXME: We'd like to keep the non-canonical type for diagnostics! 1203 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1204 Ty = Context.getCanonicalType(Ty); 1205 return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 1206 } 1207 1208 case Declarator::DK_Operator: 1209 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 1210 return Context.DeclarationNames.getCXXOperatorName( 1211 D.getOverloadedOperator()); 1212 } 1213 1214 assert(false && "Unknown name kind"); 1215 return DeclarationName(); 1216} 1217 1218/// isNearlyMatchingFunction - Determine whether the C++ functions 1219/// Declaration and Definition are "nearly" matching. This heuristic 1220/// is used to improve diagnostics in the case where an out-of-line 1221/// function definition doesn't match any declaration within 1222/// the class or namespace. 1223static bool isNearlyMatchingFunction(ASTContext &Context, 1224 FunctionDecl *Declaration, 1225 FunctionDecl *Definition) { 1226 if (Declaration->param_size() != Definition->param_size()) 1227 return false; 1228 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1229 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1230 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1231 1232 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1233 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 1234 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1235 return false; 1236 } 1237 1238 return true; 1239} 1240 1241Sema::DeclPtrTy 1242Sema::ActOnDeclarator(Scope *S, Declarator &D, bool IsFunctionDefinition) { 1243 DeclarationName Name = GetNameForDeclarator(D); 1244 1245 // All of these full declarators require an identifier. If it doesn't have 1246 // one, the ParsedFreeStandingDeclSpec action should be used. 1247 if (!Name) { 1248 if (!D.getInvalidType()) // Reject this if we think it is valid. 1249 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1250 diag::err_declarator_need_ident) 1251 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1252 return DeclPtrTy(); 1253 } 1254 1255 // The scope passed in may not be a decl scope. Zip up the scope tree until 1256 // we find one that is. 1257 while ((S->getFlags() & Scope::DeclScope) == 0 || 1258 (S->getFlags() & Scope::TemplateParamScope) != 0) 1259 S = S->getParent(); 1260 1261 DeclContext *DC; 1262 NamedDecl *PrevDecl; 1263 NamedDecl *New; 1264 bool InvalidDecl = false; 1265 1266 QualType R = GetTypeForDeclarator(D, S); 1267 if (R.isNull()) { 1268 InvalidDecl = true; 1269 R = Context.IntTy; 1270 } 1271 1272 // See if this is a redefinition of a variable in the same scope. 1273 if (D.getCXXScopeSpec().isInvalid()) { 1274 DC = CurContext; 1275 PrevDecl = 0; 1276 InvalidDecl = true; 1277 } else if (!D.getCXXScopeSpec().isSet()) { 1278 LookupNameKind NameKind = LookupOrdinaryName; 1279 1280 // If the declaration we're planning to build will be a function 1281 // or object with linkage, then look for another declaration with 1282 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1283 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1284 /* Do nothing*/; 1285 else if (R->isFunctionType()) { 1286 if (CurContext->isFunctionOrMethod()) 1287 NameKind = LookupRedeclarationWithLinkage; 1288 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1289 NameKind = LookupRedeclarationWithLinkage; 1290 1291 DC = CurContext; 1292 PrevDecl = LookupName(S, Name, NameKind, true, 1293 D.getDeclSpec().getStorageClassSpec() != 1294 DeclSpec::SCS_static, 1295 D.getIdentifierLoc()); 1296 } else { // Something like "int foo::x;" 1297 DC = computeDeclContext(D.getCXXScopeSpec()); 1298 // FIXME: RequireCompleteDeclContext(D.getCXXScopeSpec()); ? 1299 PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName, true); 1300 1301 // C++ 7.3.1.2p2: 1302 // Members (including explicit specializations of templates) of a named 1303 // namespace can also be defined outside that namespace by explicit 1304 // qualification of the name being defined, provided that the entity being 1305 // defined was already declared in the namespace and the definition appears 1306 // after the point of declaration in a namespace that encloses the 1307 // declarations namespace. 1308 // 1309 // Note that we only check the context at this point. We don't yet 1310 // have enough information to make sure that PrevDecl is actually 1311 // the declaration we want to match. For example, given: 1312 // 1313 // class X { 1314 // void f(); 1315 // void f(float); 1316 // }; 1317 // 1318 // void X::f(int) { } // ill-formed 1319 // 1320 // In this case, PrevDecl will point to the overload set 1321 // containing the two f's declared in X, but neither of them 1322 // matches. 1323 1324 // First check whether we named the global scope. 1325 if (isa<TranslationUnitDecl>(DC)) { 1326 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1327 << Name << D.getCXXScopeSpec().getRange(); 1328 } else if (!CurContext->Encloses(DC)) { 1329 // The qualifying scope doesn't enclose the original declaration. 1330 // Emit diagnostic based on current scope. 1331 SourceLocation L = D.getIdentifierLoc(); 1332 SourceRange R = D.getCXXScopeSpec().getRange(); 1333 if (isa<FunctionDecl>(CurContext)) 1334 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1335 else 1336 Diag(L, diag::err_invalid_declarator_scope) 1337 << Name << cast<NamedDecl>(DC) << R; 1338 InvalidDecl = true; 1339 } 1340 } 1341 1342 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1343 // Maybe we will complain about the shadowed template parameter. 1344 InvalidDecl = InvalidDecl 1345 || DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 1346 // Just pretend that we didn't see the previous declaration. 1347 PrevDecl = 0; 1348 } 1349 1350 // In C++, the previous declaration we find might be a tag type 1351 // (class or enum). In this case, the new declaration will hide the 1352 // tag type. Note that this does does not apply if we're declaring a 1353 // typedef (C++ [dcl.typedef]p4). 1354 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 1355 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1356 PrevDecl = 0; 1357 1358 bool Redeclaration = false; 1359 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1360 New = ActOnTypedefDeclarator(S, D, DC, R, PrevDecl, 1361 InvalidDecl, Redeclaration); 1362 } else if (R->isFunctionType()) { 1363 New = ActOnFunctionDeclarator(S, D, DC, R, PrevDecl, 1364 IsFunctionDefinition, InvalidDecl, 1365 Redeclaration); 1366 } else { 1367 New = ActOnVariableDeclarator(S, D, DC, R, PrevDecl, 1368 InvalidDecl, Redeclaration); 1369 } 1370 1371 if (New == 0) 1372 return DeclPtrTy(); 1373 1374 // If this has an identifier and is not an invalid redeclaration, 1375 // add it to the scope stack. 1376 if (Name && !(Redeclaration && InvalidDecl)) 1377 PushOnScopeChains(New, S); 1378 // If any semantic error occurred, mark the decl as invalid. 1379 if (D.getInvalidType() || InvalidDecl) 1380 New->setInvalidDecl(); 1381 1382 return DeclPtrTy::make(New); 1383} 1384 1385/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 1386/// types into constant array types in certain situations which would otherwise 1387/// be errors (for GCC compatibility). 1388static QualType TryToFixInvalidVariablyModifiedType(QualType T, 1389 ASTContext &Context, 1390 bool &SizeIsNegative) { 1391 // This method tries to turn a variable array into a constant 1392 // array even when the size isn't an ICE. This is necessary 1393 // for compatibility with code that depends on gcc's buggy 1394 // constant expression folding, like struct {char x[(int)(char*)2];} 1395 SizeIsNegative = false; 1396 1397 if (const PointerType* PTy = dyn_cast<PointerType>(T)) { 1398 QualType Pointee = PTy->getPointeeType(); 1399 QualType FixedType = 1400 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 1401 if (FixedType.isNull()) return FixedType; 1402 FixedType = Context.getPointerType(FixedType); 1403 FixedType.setCVRQualifiers(T.getCVRQualifiers()); 1404 return FixedType; 1405 } 1406 1407 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 1408 if (!VLATy) 1409 return QualType(); 1410 // FIXME: We should probably handle this case 1411 if (VLATy->getElementType()->isVariablyModifiedType()) 1412 return QualType(); 1413 1414 Expr::EvalResult EvalResult; 1415 if (!VLATy->getSizeExpr() || 1416 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 1417 !EvalResult.Val.isInt()) 1418 return QualType(); 1419 1420 llvm::APSInt &Res = EvalResult.Val.getInt(); 1421 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) 1422 return Context.getConstantArrayType(VLATy->getElementType(), 1423 Res, ArrayType::Normal, 0); 1424 1425 SizeIsNegative = true; 1426 return QualType(); 1427} 1428 1429/// \brief Register the given locally-scoped external C declaration so 1430/// that it can be found later for redeclarations 1431void 1432Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, NamedDecl *PrevDecl, 1433 Scope *S) { 1434 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 1435 "Decl is not a locally-scoped decl!"); 1436 // Note that we have a locally-scoped external with this name. 1437 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 1438 1439 if (!PrevDecl) 1440 return; 1441 1442 // If there was a previous declaration of this variable, it may be 1443 // in our identifier chain. Update the identifier chain with the new 1444 // declaration. 1445 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 1446 // The previous declaration was found on the identifer resolver 1447 // chain, so remove it from its scope. 1448 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 1449 S = S->getParent(); 1450 1451 if (S) 1452 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 1453 } 1454} 1455 1456NamedDecl* 1457Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1458 QualType R, Decl* PrevDecl, bool& InvalidDecl, 1459 bool &Redeclaration) { 1460 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1461 if (D.getCXXScopeSpec().isSet()) { 1462 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1463 << D.getCXXScopeSpec().getRange(); 1464 InvalidDecl = true; 1465 // Pretend we didn't see the scope specifier. 1466 DC = 0; 1467 } 1468 1469 if (getLangOptions().CPlusPlus) { 1470 // Check that there are no default arguments (C++ only). 1471 CheckExtraCXXDefaultArguments(D); 1472 1473 if (D.getDeclSpec().isVirtualSpecified()) 1474 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1475 diag::err_virtual_non_function); 1476 } 1477 1478 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R); 1479 if (!NewTD) return 0; 1480 1481 // Handle attributes prior to checking for duplicates in MergeVarDecl 1482 ProcessDeclAttributes(NewTD, D); 1483 // Merge the decl with the existing one if appropriate. If the decl is 1484 // in an outer scope, it isn't the same thing. 1485 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1486 Redeclaration = true; 1487 if (MergeTypeDefDecl(NewTD, PrevDecl)) 1488 InvalidDecl = true; 1489 } 1490 1491 if (S->getFnParent() == 0) { 1492 QualType T = NewTD->getUnderlyingType(); 1493 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1494 // then it shall have block scope. 1495 if (T->isVariablyModifiedType()) { 1496 bool SizeIsNegative; 1497 QualType FixedTy = 1498 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1499 if (!FixedTy.isNull()) { 1500 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 1501 NewTD->setUnderlyingType(FixedTy); 1502 } else { 1503 if (SizeIsNegative) 1504 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 1505 else if (T->isVariableArrayType()) 1506 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1507 else 1508 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1509 InvalidDecl = true; 1510 } 1511 } 1512 } 1513 return NewTD; 1514} 1515 1516/// \brief Determines whether the given declaration is an out-of-scope 1517/// previous declaration. 1518/// 1519/// This routine should be invoked when name lookup has found a 1520/// previous declaration (PrevDecl) that is not in the scope where a 1521/// new declaration by the same name is being introduced. If the new 1522/// declaration occurs in a local scope, previous declarations with 1523/// linkage may still be considered previous declarations (C99 1524/// 6.2.2p4-5, C++ [basic.link]p6). 1525/// 1526/// \param PrevDecl the previous declaration found by name 1527/// lookup 1528/// 1529/// \param DC the context in which the new declaration is being 1530/// declared. 1531/// 1532/// \returns true if PrevDecl is an out-of-scope previous declaration 1533/// for a new delcaration with the same name. 1534static bool 1535isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 1536 ASTContext &Context) { 1537 if (!PrevDecl) 1538 return 0; 1539 1540 // FIXME: PrevDecl could be an OverloadedFunctionDecl, in which 1541 // case we need to check each of the overloaded functions. 1542 if (!PrevDecl->hasLinkage()) 1543 return false; 1544 1545 if (Context.getLangOptions().CPlusPlus) { 1546 // C++ [basic.link]p6: 1547 // If there is a visible declaration of an entity with linkage 1548 // having the same name and type, ignoring entities declared 1549 // outside the innermost enclosing namespace scope, the block 1550 // scope declaration declares that same entity and receives the 1551 // linkage of the previous declaration. 1552 DeclContext *OuterContext = DC->getLookupContext(); 1553 if (!OuterContext->isFunctionOrMethod()) 1554 // This rule only applies to block-scope declarations. 1555 return false; 1556 else { 1557 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 1558 if (PrevOuterContext->isRecord()) 1559 // We found a member function: ignore it. 1560 return false; 1561 else { 1562 // Find the innermost enclosing namespace for the new and 1563 // previous declarations. 1564 while (!OuterContext->isFileContext()) 1565 OuterContext = OuterContext->getParent(); 1566 while (!PrevOuterContext->isFileContext()) 1567 PrevOuterContext = PrevOuterContext->getParent(); 1568 1569 // The previous declaration is in a different namespace, so it 1570 // isn't the same function. 1571 if (OuterContext->getPrimaryContext() != 1572 PrevOuterContext->getPrimaryContext()) 1573 return false; 1574 } 1575 } 1576 } 1577 1578 return true; 1579} 1580 1581NamedDecl* 1582Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1583 QualType R,NamedDecl* PrevDecl, bool& InvalidDecl, 1584 bool &Redeclaration) { 1585 DeclarationName Name = GetNameForDeclarator(D); 1586 1587 // Check that there are no default arguments (C++ only). 1588 if (getLangOptions().CPlusPlus) 1589 CheckExtraCXXDefaultArguments(D); 1590 1591 VarDecl *NewVD; 1592 VarDecl::StorageClass SC; 1593 switch (D.getDeclSpec().getStorageClassSpec()) { 1594 default: assert(0 && "Unknown storage class!"); 1595 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1596 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1597 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1598 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1599 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1600 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1601 case DeclSpec::SCS_mutable: 1602 // mutable can only appear on non-static class members, so it's always 1603 // an error here 1604 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1605 InvalidDecl = true; 1606 SC = VarDecl::None; 1607 break; 1608 } 1609 1610 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1611 if (!II) { 1612 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1613 << Name.getAsString(); 1614 return 0; 1615 } 1616 1617 if (D.getDeclSpec().isVirtualSpecified()) 1618 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1619 diag::err_virtual_non_function); 1620 1621 bool ThreadSpecified = D.getDeclSpec().isThreadSpecified(); 1622 if (!DC->isRecord() && S->getFnParent() == 0) { 1623 // C99 6.9p2: The storage-class specifiers auto and register shall not 1624 // appear in the declaration specifiers in an external declaration. 1625 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 1626 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 1627 InvalidDecl = true; 1628 } 1629 } 1630 if (DC->isRecord() && !CurContext->isRecord()) { 1631 // This is an out-of-line definition of a static data member. 1632 if (SC == VarDecl::Static) { 1633 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1634 diag::err_static_out_of_line) 1635 << CodeModificationHint::CreateRemoval( 1636 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 1637 } else if (SC == VarDecl::None) 1638 SC = VarDecl::Static; 1639 } 1640 1641 // The variable can not 1642 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1643 II, R, SC, 1644 // FIXME: Move to DeclGroup... 1645 D.getDeclSpec().getSourceRange().getBegin()); 1646 NewVD->setThreadSpecified(ThreadSpecified); 1647 1648 // Set the lexical context. If the declarator has a C++ scope specifier, the 1649 // lexical context will be different from the semantic context. 1650 NewVD->setLexicalDeclContext(CurContext); 1651 1652 // Handle attributes prior to checking for duplicates in MergeVarDecl 1653 ProcessDeclAttributes(NewVD, D); 1654 1655 // Handle GNU asm-label extension (encoded as an attribute). 1656 if (Expr *E = (Expr*) D.getAsmLabel()) { 1657 // The parser guarantees this is a string. 1658 StringLiteral *SE = cast<StringLiteral>(E); 1659 NewVD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 1660 SE->getByteLength()))); 1661 } 1662 1663 // If name lookup finds a previous declaration that is not in the 1664 // same scope as the new declaration, this may still be an 1665 // acceptable redeclaration. 1666 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 1667 !(NewVD->hasLinkage() && 1668 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 1669 PrevDecl = 0; 1670 1671 // Merge the decl with the existing one if appropriate. 1672 if (PrevDecl) { 1673 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 1674 // The user tried to define a non-static data member 1675 // out-of-line (C++ [dcl.meaning]p1). 1676 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 1677 << D.getCXXScopeSpec().getRange(); 1678 PrevDecl = 0; 1679 InvalidDecl = true; 1680 } 1681 } else if (D.getCXXScopeSpec().isSet()) { 1682 // No previous declaration in the qualifying scope. 1683 Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 1684 << Name << D.getCXXScopeSpec().getRange(); 1685 InvalidDecl = true; 1686 } 1687 1688 if (CheckVariableDeclaration(NewVD, PrevDecl, Redeclaration)) 1689 InvalidDecl = true; 1690 1691 // If this is a locally-scoped extern C variable, update the map of 1692 // such variables. 1693 if (CurContext->isFunctionOrMethod() && NewVD->isExternC(Context) && 1694 !InvalidDecl) 1695 RegisterLocallyScopedExternCDecl(NewVD, PrevDecl, S); 1696 1697 return NewVD; 1698} 1699 1700/// \brief Perform semantic checking on a newly-created variable 1701/// declaration. 1702/// 1703/// This routine performs all of the type-checking required for a 1704/// variable declaration once it has been build. It is used both to 1705/// check variables after they have been parsed and their declarators 1706/// have been translated into a declaration, and to check 1707/// 1708/// \returns true if an error was encountered, false otherwise. 1709bool Sema::CheckVariableDeclaration(VarDecl *NewVD, NamedDecl *PrevDecl, 1710 bool &Redeclaration) { 1711 bool Invalid = false; 1712 1713 QualType T = NewVD->getType(); 1714 1715 if (T->isObjCInterfaceType()) { 1716 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 1717 Invalid = true; 1718 } 1719 1720 // The variable can not have an abstract class type. 1721 if (RequireNonAbstractType(NewVD->getLocation(), T, 1722 diag::err_abstract_type_in_decl, 1723 AbstractVariableType)) 1724 Invalid = true; 1725 1726 // Emit an error if an address space was applied to decl with local storage. 1727 // This includes arrays of objects with address space qualifiers, but not 1728 // automatic variables that point to other address spaces. 1729 // ISO/IEC TR 18037 S5.1.2 1730 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 1731 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 1732 Invalid = true; 1733 } 1734 1735 if (NewVD->hasLocalStorage() && T.isObjCGCWeak()) 1736 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 1737 1738 bool isIllegalVLA = T->isVariableArrayType() && NewVD->hasGlobalStorage(); 1739 bool isIllegalVM = T->isVariablyModifiedType() && NewVD->hasLinkage(); 1740 if (isIllegalVLA || isIllegalVM) { 1741 bool SizeIsNegative; 1742 QualType FixedTy = 1743 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1744 if (!FixedTy.isNull()) { 1745 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 1746 NewVD->setType(FixedTy); 1747 } else if (T->isVariableArrayType()) { 1748 Invalid = true; 1749 1750 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 1751 // FIXME: This won't give the correct result for 1752 // int a[10][n]; 1753 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 1754 1755 if (NewVD->isFileVarDecl()) 1756 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 1757 << SizeRange; 1758 else if (NewVD->getStorageClass() == VarDecl::Static) 1759 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 1760 << SizeRange; 1761 else 1762 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 1763 << SizeRange; 1764 } else { 1765 Invalid = true; 1766 1767 if (NewVD->isFileVarDecl()) 1768 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 1769 else 1770 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 1771 } 1772 } 1773 1774 if (!PrevDecl && NewVD->isExternC(Context)) { 1775 // Since we did not find anything by this name and we're declaring 1776 // an extern "C" variable, look for a non-visible extern "C" 1777 // declaration with the same name. 1778 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 1779 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 1780 if (Pos != LocallyScopedExternalDecls.end()) 1781 PrevDecl = Pos->second; 1782 } 1783 1784 if (!Invalid && T->isVoidType() && !NewVD->hasExternalStorage()) { 1785 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 1786 << T; 1787 Invalid = true; 1788 } 1789 1790 if (PrevDecl) { 1791 Redeclaration = true; 1792 if (MergeVarDecl(NewVD, PrevDecl)) 1793 Invalid = true; 1794 } 1795 1796 return NewVD->isInvalidDecl() || Invalid; 1797} 1798 1799NamedDecl* 1800Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1801 QualType R, NamedDecl* PrevDecl, 1802 bool IsFunctionDefinition, 1803 bool& InvalidDecl, bool &Redeclaration) { 1804 assert(R.getTypePtr()->isFunctionType()); 1805 1806 DeclarationName Name = GetNameForDeclarator(D); 1807 FunctionDecl::StorageClass SC = FunctionDecl::None; 1808 switch (D.getDeclSpec().getStorageClassSpec()) { 1809 default: assert(0 && "Unknown storage class!"); 1810 case DeclSpec::SCS_auto: 1811 case DeclSpec::SCS_register: 1812 case DeclSpec::SCS_mutable: 1813 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1814 diag::err_typecheck_sclass_func); 1815 InvalidDecl = true; 1816 break; 1817 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 1818 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 1819 case DeclSpec::SCS_static: { 1820 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 1821 // C99 6.7.1p5: 1822 // The declaration of an identifier for a function that has 1823 // block scope shall have no explicit storage-class specifier 1824 // other than extern 1825 // See also (C++ [dcl.stc]p4). 1826 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1827 diag::err_static_block_func); 1828 SC = FunctionDecl::None; 1829 } else 1830 SC = FunctionDecl::Static; 1831 break; 1832 } 1833 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 1834 } 1835 1836 bool isInline = D.getDeclSpec().isInlineSpecified(); 1837 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1838 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 1839 1840 // Check that the return type is not an abstract class type. 1841 // For record types, this is done by the AbstractClassUsageDiagnoser once 1842 // the class has been completely parsed. 1843 if (!DC->isRecord() && 1844 RequireNonAbstractType(D.getIdentifierLoc(), 1845 R->getAsFunctionType()->getResultType(), 1846 diag::err_abstract_type_in_decl, 1847 AbstractReturnType)) 1848 InvalidDecl = true; 1849 1850 bool isVirtualOkay = false; 1851 FunctionDecl *NewFD; 1852 if (D.getKind() == Declarator::DK_Constructor) { 1853 // This is a C++ constructor declaration. 1854 assert(DC->isRecord() && 1855 "Constructors can only be declared in a member context"); 1856 1857 InvalidDecl = InvalidDecl || CheckConstructorDeclarator(D, R, SC); 1858 1859 // Create the new declaration 1860 NewFD = CXXConstructorDecl::Create(Context, 1861 cast<CXXRecordDecl>(DC), 1862 D.getIdentifierLoc(), Name, R, 1863 isExplicit, isInline, 1864 /*isImplicitlyDeclared=*/false); 1865 1866 if (InvalidDecl) 1867 NewFD->setInvalidDecl(); 1868 } else if (D.getKind() == Declarator::DK_Destructor) { 1869 // This is a C++ destructor declaration. 1870 if (DC->isRecord()) { 1871 InvalidDecl = InvalidDecl || CheckDestructorDeclarator(D, R, SC); 1872 1873 NewFD = CXXDestructorDecl::Create(Context, 1874 cast<CXXRecordDecl>(DC), 1875 D.getIdentifierLoc(), Name, R, 1876 isInline, 1877 /*isImplicitlyDeclared=*/false); 1878 1879 if (InvalidDecl) 1880 NewFD->setInvalidDecl(); 1881 1882 isVirtualOkay = true; 1883 } else { 1884 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 1885 1886 // Create a FunctionDecl to satisfy the function definition parsing 1887 // code path. 1888 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 1889 Name, R, SC, isInline, 1890 /*hasPrototype=*/true, 1891 // FIXME: Move to DeclGroup... 1892 D.getDeclSpec().getSourceRange().getBegin()); 1893 InvalidDecl = true; 1894 NewFD->setInvalidDecl(); 1895 } 1896 } else if (D.getKind() == Declarator::DK_Conversion) { 1897 if (!DC->isRecord()) { 1898 Diag(D.getIdentifierLoc(), 1899 diag::err_conv_function_not_member); 1900 return 0; 1901 } else { 1902 InvalidDecl = InvalidDecl || CheckConversionDeclarator(D, R, SC); 1903 1904 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 1905 D.getIdentifierLoc(), Name, R, 1906 isInline, isExplicit); 1907 1908 if (InvalidDecl) 1909 NewFD->setInvalidDecl(); 1910 1911 isVirtualOkay = true; 1912 } 1913 } else if (DC->isRecord()) { 1914 // This is a C++ method declaration. 1915 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 1916 D.getIdentifierLoc(), Name, R, 1917 (SC == FunctionDecl::Static), isInline); 1918 1919 isVirtualOkay = (SC != FunctionDecl::Static); 1920 } else { 1921 // Determine whether the function was written with a 1922 // prototype. This true when: 1923 // - we're in C++ (where every function has a prototype), 1924 // - there is a prototype in the declarator, or 1925 // - the type R of the function is some kind of typedef or other reference 1926 // to a type name (which eventually refers to a function type). 1927 bool HasPrototype = 1928 getLangOptions().CPlusPlus || 1929 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 1930 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 1931 1932 NewFD = FunctionDecl::Create(Context, DC, 1933 D.getIdentifierLoc(), 1934 Name, R, SC, isInline, HasPrototype, 1935 // FIXME: Move to DeclGroup... 1936 D.getDeclSpec().getSourceRange().getBegin()); 1937 } 1938 1939 // Set the lexical context. If the declarator has a C++ 1940 // scope specifier, the lexical context will be different 1941 // from the semantic context. 1942 NewFD->setLexicalDeclContext(CurContext); 1943 1944 // C++ [dcl.fct.spec]p5: 1945 // The virtual specifier shall only be used in declarations of 1946 // nonstatic class member functions that appear within a 1947 // member-specification of a class declaration; see 10.3. 1948 // 1949 // FIXME: Checking the 'virtual' specifier is not sufficient. A 1950 // function is also virtual if it overrides an already virtual 1951 // function. This is important to do here because it's part of the 1952 // declaration. 1953 if (isVirtual && !InvalidDecl) { 1954 if (!isVirtualOkay) { 1955 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1956 diag::err_virtual_non_function); 1957 } else if (!CurContext->isRecord()) { 1958 // 'virtual' was specified outside of the class. 1959 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 1960 << CodeModificationHint::CreateRemoval( 1961 SourceRange(D.getDeclSpec().getVirtualSpecLoc())); 1962 } else { 1963 // Okay: Add virtual to the method. 1964 cast<CXXMethodDecl>(NewFD)->setVirtual(); 1965 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 1966 CurClass->setAggregate(false); 1967 CurClass->setPOD(false); 1968 CurClass->setPolymorphic(true); 1969 } 1970 } 1971 1972 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 1973 !CurContext->isRecord()) { 1974 // C++ [class.static]p1: 1975 // A data or function member of a class may be declared static 1976 // in a class definition, in which case it is a static member of 1977 // the class. 1978 1979 // Complain about the 'static' specifier if it's on an out-of-line 1980 // member function definition. 1981 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1982 diag::err_static_out_of_line) 1983 << CodeModificationHint::CreateRemoval( 1984 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 1985 } 1986 1987 // Handle GNU asm-label extension (encoded as an attribute). 1988 if (Expr *E = (Expr*) D.getAsmLabel()) { 1989 // The parser guarantees this is a string. 1990 StringLiteral *SE = cast<StringLiteral>(E); 1991 NewFD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 1992 SE->getByteLength()))); 1993 } 1994 1995 // Copy the parameter declarations from the declarator D to 1996 // the function declaration NewFD, if they are available. 1997 if (D.getNumTypeObjects() > 0) { 1998 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1999 2000 // Create Decl objects for each parameter, adding them to the 2001 // FunctionDecl. 2002 llvm::SmallVector<ParmVarDecl*, 16> Params; 2003 2004 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 2005 // function that takes no arguments, not a function that takes a 2006 // single void argument. 2007 // We let through "const void" here because Sema::GetTypeForDeclarator 2008 // already checks for that case. 2009 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2010 FTI.ArgInfo[0].Param && 2011 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 2012 // empty arg list, don't push any params. 2013 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 2014 2015 // In C++, the empty parameter-type-list must be spelled "void"; a 2016 // typedef of void is not permitted. 2017 if (getLangOptions().CPlusPlus && 2018 Param->getType().getUnqualifiedType() != Context.VoidTy) { 2019 Diag(Param->getLocation(), diag::ext_param_typedef_of_void); 2020 } 2021 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 2022 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 2023 Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 2024 } 2025 2026 NewFD->setParams(Context, &Params[0], Params.size()); 2027 } else if (R->getAsTypedefType()) { 2028 // When we're declaring a function with a typedef, as in the 2029 // following example, we'll need to synthesize (unnamed) 2030 // parameters for use in the declaration. 2031 // 2032 // @code 2033 // typedef void fn(int); 2034 // fn f; 2035 // @endcode 2036 const FunctionProtoType *FT = R->getAsFunctionProtoType(); 2037 if (!FT) { 2038 // This is a typedef of a function with no prototype, so we 2039 // don't need to do anything. 2040 } else if ((FT->getNumArgs() == 0) || 2041 (FT->getNumArgs() == 1 && !FT->isVariadic() && 2042 FT->getArgType(0)->isVoidType())) { 2043 // This is a zero-argument function. We don't need to do anything. 2044 } else { 2045 // Synthesize a parameter for each argument type. 2046 llvm::SmallVector<ParmVarDecl*, 16> Params; 2047 for (FunctionProtoType::arg_type_iterator ArgType = FT->arg_type_begin(); 2048 ArgType != FT->arg_type_end(); ++ArgType) { 2049 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, 2050 SourceLocation(), 0, 2051 *ArgType, VarDecl::None, 2052 0); 2053 Param->setImplicit(); 2054 Params.push_back(Param); 2055 } 2056 2057 NewFD->setParams(Context, &Params[0], Params.size()); 2058 } 2059 } 2060 2061 // If name lookup finds a previous declaration that is not in the 2062 // same scope as the new declaration, this may still be an 2063 // acceptable redeclaration. 2064 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 2065 !(NewFD->hasLinkage() && 2066 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 2067 PrevDecl = 0; 2068 2069 // Perform semantic checking on the function declaration. 2070 bool OverloadableAttrRequired = false; // FIXME: HACK! 2071 if (CheckFunctionDeclaration(NewFD, PrevDecl, Redeclaration, 2072 /*FIXME:*/OverloadableAttrRequired)) 2073 InvalidDecl = true; 2074 2075 if (D.getCXXScopeSpec().isSet() && !InvalidDecl) { 2076 // An out-of-line member function declaration must also be a 2077 // definition (C++ [dcl.meaning]p1). 2078 if (!IsFunctionDefinition) { 2079 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2080 << D.getCXXScopeSpec().getRange(); 2081 InvalidDecl = true; 2082 } else if (!Redeclaration) { 2083 // The user tried to provide an out-of-line definition for a 2084 // function that is a member of a class or namespace, but there 2085 // was no such member function declared (C++ [class.mfct]p2, 2086 // C++ [namespace.memdef]p2). For example: 2087 // 2088 // class X { 2089 // void f() const; 2090 // }; 2091 // 2092 // void X::f() { } // ill-formed 2093 // 2094 // Complain about this problem, and attempt to suggest close 2095 // matches (e.g., those that differ only in cv-qualifiers and 2096 // whether the parameter types are references). 2097 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 2098 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 2099 InvalidDecl = true; 2100 2101 LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 2102 true); 2103 assert(!Prev.isAmbiguous() && 2104 "Cannot have an ambiguity in previous-declaration lookup"); 2105 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 2106 Func != FuncEnd; ++Func) { 2107 if (isa<FunctionDecl>(*Func) && 2108 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 2109 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 2110 } 2111 2112 PrevDecl = 0; 2113 } 2114 } 2115 2116 // Handle attributes. We need to have merged decls when handling attributes 2117 // (for example to check for conflicts, etc). 2118 // FIXME: This needs to happen before we merge declarations. Then, 2119 // let attribute merging cope with attribute conflicts. 2120 ProcessDeclAttributes(NewFD, D); 2121 AddKnownFunctionAttributes(NewFD); 2122 2123 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 2124 // If a function name is overloadable in C, then every function 2125 // with that name must be marked "overloadable". 2126 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 2127 << Redeclaration << NewFD; 2128 if (PrevDecl) 2129 Diag(PrevDecl->getLocation(), 2130 diag::note_attribute_overloadable_prev_overload); 2131 NewFD->addAttr(::new (Context) OverloadableAttr()); 2132 } 2133 2134 // If this is a locally-scoped extern C function, update the 2135 // map of such names. 2136 if (CurContext->isFunctionOrMethod() && NewFD->isExternC(Context) 2137 && !InvalidDecl) 2138 RegisterLocallyScopedExternCDecl(NewFD, PrevDecl, S); 2139 2140 return NewFD; 2141} 2142 2143/// \brief Perform semantic checking of a new function declaration. 2144/// 2145/// Performs semantic analysis of the new function declaration 2146/// NewFD. This routine performs all semantic checking that does not 2147/// require the actual declarator involved in the declaration, and is 2148/// used both for the declaration of functions as they are parsed 2149/// (called via ActOnDeclarator) and for the declaration of functions 2150/// that have been instantiated via C++ template instantiation (called 2151/// via InstantiateDecl). 2152/// 2153/// \returns true if there was an error, false otherwise. 2154bool Sema::CheckFunctionDeclaration(FunctionDecl *NewFD, NamedDecl *&PrevDecl, 2155 bool &Redeclaration, 2156 bool &OverloadableAttrRequired) { 2157 bool InvalidDecl = false; 2158 2159 // Semantic checking for this function declaration (in isolation). 2160 if (getLangOptions().CPlusPlus) { 2161 // C++-specific checks. 2162 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) 2163 InvalidDecl = InvalidDecl || CheckConstructor(Constructor); 2164 else if (isa<CXXDestructorDecl>(NewFD)) { 2165 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 2166 Record->setUserDeclaredDestructor(true); 2167 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 2168 // user-defined destructor. 2169 Record->setPOD(false); 2170 } else if (CXXConversionDecl *Conversion 2171 = dyn_cast<CXXConversionDecl>(NewFD)) 2172 ActOnConversionDeclarator(Conversion); 2173 2174 // Extra checking for C++ overloaded operators (C++ [over.oper]). 2175 if (NewFD->isOverloadedOperator() && 2176 CheckOverloadedOperatorDeclaration(NewFD)) 2177 InvalidDecl = true; 2178 } 2179 2180 // Check for a previous declaration of this name. 2181 if (!PrevDecl && NewFD->isExternC(Context)) { 2182 // Since we did not find anything by this name and we're declaring 2183 // an extern "C" function, look for a non-visible extern "C" 2184 // declaration with the same name. 2185 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2186 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 2187 if (Pos != LocallyScopedExternalDecls.end()) 2188 PrevDecl = Pos->second; 2189 } 2190 2191 // Merge or overload the declaration with an existing declaration of 2192 // the same name, if appropriate. 2193 if (PrevDecl) { 2194 // Determine whether NewFD is an overload of PrevDecl or 2195 // a declaration that requires merging. If it's an overload, 2196 // there's no more work to do here; we'll just add the new 2197 // function to the scope. 2198 OverloadedFunctionDecl::function_iterator MatchedDecl; 2199 2200 if (!getLangOptions().CPlusPlus && 2201 AllowOverloadingOfFunction(PrevDecl, Context)) { 2202 OverloadableAttrRequired = true; 2203 2204 // Functions marked "overloadable" must have a prototype (that 2205 // we can't get through declaration merging). 2206 if (!NewFD->getType()->getAsFunctionProtoType()) { 2207 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_no_prototype) 2208 << NewFD; 2209 InvalidDecl = true; 2210 Redeclaration = true; 2211 2212 // Turn this into a variadic function with no parameters. 2213 QualType R = Context.getFunctionType( 2214 NewFD->getType()->getAsFunctionType()->getResultType(), 2215 0, 0, true, 0); 2216 NewFD->setType(R); 2217 } 2218 } 2219 2220 if (PrevDecl && 2221 (!AllowOverloadingOfFunction(PrevDecl, Context) || 2222 !IsOverload(NewFD, PrevDecl, MatchedDecl))) { 2223 Redeclaration = true; 2224 Decl *OldDecl = PrevDecl; 2225 2226 // If PrevDecl was an overloaded function, extract the 2227 // FunctionDecl that matched. 2228 if (isa<OverloadedFunctionDecl>(PrevDecl)) 2229 OldDecl = *MatchedDecl; 2230 2231 // NewFD and OldDecl represent declarations that need to be 2232 // merged. 2233 if (MergeFunctionDecl(NewFD, OldDecl)) 2234 InvalidDecl = true; 2235 2236 if (!InvalidDecl) 2237 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 2238 } 2239 } 2240 2241 if (getLangOptions().CPlusPlus && !CurContext->isRecord()) { 2242 // In C++, check default arguments now that we have merged decls. Unless 2243 // the lexical context is the class, because in this case this is done 2244 // during delayed parsing anyway. 2245 CheckCXXDefaultArguments(NewFD); 2246 } 2247 2248 return InvalidDecl || NewFD->isInvalidDecl(); 2249} 2250 2251bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 2252 // FIXME: Need strict checking. In C89, we need to check for 2253 // any assignment, increment, decrement, function-calls, or 2254 // commas outside of a sizeof. In C99, it's the same list, 2255 // except that the aforementioned are allowed in unevaluated 2256 // expressions. Everything else falls under the 2257 // "may accept other forms of constant expressions" exception. 2258 // (We never end up here for C++, so the constant expression 2259 // rules there don't matter.) 2260 if (Init->isConstantInitializer(Context)) 2261 return false; 2262 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 2263 << Init->getSourceRange(); 2264 return true; 2265} 2266 2267void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 2268 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 2269} 2270 2271/// AddInitializerToDecl - Adds the initializer Init to the 2272/// declaration dcl. If DirectInit is true, this is C++ direct 2273/// initialization rather than copy initialization. 2274void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 2275 Decl *RealDecl = dcl.getAs<Decl>(); 2276 // If there is no declaration, there was an error parsing it. Just ignore 2277 // the initializer. 2278 if (RealDecl == 0) 2279 return; 2280 2281 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 2282 // With declarators parsed the way they are, the parser cannot 2283 // distinguish between a normal initializer and a pure-specifier. 2284 // Thus this grotesque test. 2285 IntegerLiteral *IL; 2286 Expr *Init = static_cast<Expr *>(init.get()); 2287 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 2288 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 2289 if (Method->isVirtual()) { 2290 Method->setPure(); 2291 2292 // A class is abstract if at least one function is pure virtual. 2293 cast<CXXRecordDecl>(CurContext)->setAbstract(true); 2294 } else if (!Method->isInvalidDecl()) { 2295 Diag(Method->getLocation(), diag::err_non_virtual_pure) 2296 << Method->getDeclName() << Init->getSourceRange(); 2297 Method->setInvalidDecl(); 2298 } 2299 } else { 2300 Diag(Method->getLocation(), diag::err_member_function_initialization) 2301 << Method->getDeclName() << Init->getSourceRange(); 2302 Method->setInvalidDecl(); 2303 } 2304 return; 2305 } 2306 2307 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2308 if (!VDecl) { 2309 if (getLangOptions().CPlusPlus && 2310 RealDecl->getLexicalDeclContext()->isRecord() && 2311 isa<NamedDecl>(RealDecl)) 2312 Diag(RealDecl->getLocation(), diag::err_member_initialization) 2313 << cast<NamedDecl>(RealDecl)->getDeclName(); 2314 else 2315 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2316 RealDecl->setInvalidDecl(); 2317 return; 2318 } 2319 2320 const VarDecl *Def = 0; 2321 if (VDecl->getDefinition(Def)) { 2322 Diag(VDecl->getLocation(), diag::err_redefinition) 2323 << VDecl->getDeclName(); 2324 Diag(Def->getLocation(), diag::note_previous_definition); 2325 VDecl->setInvalidDecl(); 2326 return; 2327 } 2328 2329 // Take ownership of the expression, now that we're sure we have somewhere 2330 // to put it. 2331 Expr *Init = static_cast<Expr *>(init.release()); 2332 assert(Init && "missing initializer"); 2333 2334 // Get the decls type and save a reference for later, since 2335 // CheckInitializerTypes may change it. 2336 QualType DclT = VDecl->getType(), SavT = DclT; 2337 if (VDecl->isBlockVarDecl()) { 2338 VarDecl::StorageClass SC = VDecl->getStorageClass(); 2339 if (SC == VarDecl::Extern) { // C99 6.7.8p5 2340 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2341 VDecl->setInvalidDecl(); 2342 } else if (!VDecl->isInvalidDecl()) { 2343 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2344 VDecl->getDeclName(), DirectInit)) 2345 VDecl->setInvalidDecl(); 2346 2347 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2348 // Don't check invalid declarations to avoid emitting useless diagnostics. 2349 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2350 if (SC == VarDecl::Static) // C99 6.7.8p4. 2351 CheckForConstantInitializer(Init, DclT); 2352 } 2353 } 2354 } else if (VDecl->isStaticDataMember() && 2355 VDecl->getLexicalDeclContext()->isRecord()) { 2356 // This is an in-class initialization for a static data member, e.g., 2357 // 2358 // struct S { 2359 // static const int value = 17; 2360 // }; 2361 2362 // Attach the initializer 2363 VDecl->setInit(Init); 2364 2365 // C++ [class.mem]p4: 2366 // A member-declarator can contain a constant-initializer only 2367 // if it declares a static member (9.4) of const integral or 2368 // const enumeration type, see 9.4.2. 2369 QualType T = VDecl->getType(); 2370 if (!T->isDependentType() && 2371 (!Context.getCanonicalType(T).isConstQualified() || 2372 !T->isIntegralType())) { 2373 Diag(VDecl->getLocation(), diag::err_member_initialization) 2374 << VDecl->getDeclName() << Init->getSourceRange(); 2375 VDecl->setInvalidDecl(); 2376 } else { 2377 // C++ [class.static.data]p4: 2378 // If a static data member is of const integral or const 2379 // enumeration type, its declaration in the class definition 2380 // can specify a constant-initializer which shall be an 2381 // integral constant expression (5.19). 2382 if (!Init->isTypeDependent() && 2383 !Init->getType()->isIntegralType()) { 2384 // We have a non-dependent, non-integral or enumeration type. 2385 Diag(Init->getSourceRange().getBegin(), 2386 diag::err_in_class_initializer_non_integral_type) 2387 << Init->getType() << Init->getSourceRange(); 2388 VDecl->setInvalidDecl(); 2389 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 2390 // Check whether the expression is a constant expression. 2391 llvm::APSInt Value; 2392 SourceLocation Loc; 2393 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 2394 Diag(Loc, diag::err_in_class_initializer_non_constant) 2395 << Init->getSourceRange(); 2396 VDecl->setInvalidDecl(); 2397 } else if (!VDecl->getType()->isDependentType()) 2398 ImpCastExprToType(Init, VDecl->getType()); 2399 } 2400 } 2401 } else if (VDecl->isFileVarDecl()) { 2402 if (VDecl->getStorageClass() == VarDecl::Extern) 2403 Diag(VDecl->getLocation(), diag::warn_extern_init); 2404 if (!VDecl->isInvalidDecl()) 2405 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2406 VDecl->getDeclName(), DirectInit)) 2407 VDecl->setInvalidDecl(); 2408 2409 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2410 // Don't check invalid declarations to avoid emitting useless diagnostics. 2411 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2412 // C99 6.7.8p4. All file scoped initializers need to be constant. 2413 CheckForConstantInitializer(Init, DclT); 2414 } 2415 } 2416 // If the type changed, it means we had an incomplete type that was 2417 // completed by the initializer. For example: 2418 // int ary[] = { 1, 3, 5 }; 2419 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2420 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2421 VDecl->setType(DclT); 2422 Init->setType(DclT); 2423 } 2424 2425 // Attach the initializer to the decl. 2426 VDecl->setInit(Init); 2427 return; 2428} 2429 2430void Sema::ActOnUninitializedDecl(DeclPtrTy dcl) { 2431 Decl *RealDecl = dcl.getAs<Decl>(); 2432 2433 // If there is no declaration, there was an error parsing it. Just ignore it. 2434 if (RealDecl == 0) 2435 return; 2436 2437 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2438 QualType Type = Var->getType(); 2439 // C++ [dcl.init.ref]p3: 2440 // The initializer can be omitted for a reference only in a 2441 // parameter declaration (8.3.5), in the declaration of a 2442 // function return type, in the declaration of a class member 2443 // within its class declaration (9.2), and where the extern 2444 // specifier is explicitly used. 2445 if (Type->isReferenceType() && 2446 Var->getStorageClass() != VarDecl::Extern && 2447 Var->getStorageClass() != VarDecl::PrivateExtern) { 2448 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2449 << Var->getDeclName() 2450 << SourceRange(Var->getLocation(), Var->getLocation()); 2451 Var->setInvalidDecl(); 2452 return; 2453 } 2454 2455 // C++ [dcl.init]p9: 2456 // 2457 // If no initializer is specified for an object, and the object 2458 // is of (possibly cv-qualified) non-POD class type (or array 2459 // thereof), the object shall be default-initialized; if the 2460 // object is of const-qualified type, the underlying class type 2461 // shall have a user-declared default constructor. 2462 if (getLangOptions().CPlusPlus) { 2463 QualType InitType = Type; 2464 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2465 InitType = Array->getElementType(); 2466 if (Var->getStorageClass() != VarDecl::Extern && 2467 Var->getStorageClass() != VarDecl::PrivateExtern && 2468 InitType->isRecordType()) { 2469 const CXXConstructorDecl *Constructor = 0; 2470 if (!RequireCompleteType(Var->getLocation(), InitType, 2471 diag::err_invalid_incomplete_type_use)) 2472 Constructor 2473 = PerformInitializationByConstructor(InitType, 0, 0, 2474 Var->getLocation(), 2475 SourceRange(Var->getLocation(), 2476 Var->getLocation()), 2477 Var->getDeclName(), 2478 IK_Default); 2479 if (!Constructor) 2480 Var->setInvalidDecl(); 2481 } 2482 } 2483 2484#if 0 2485 // FIXME: Temporarily disabled because we are not properly parsing 2486 // linkage specifications on declarations, e.g., 2487 // 2488 // extern "C" const CGPoint CGPointerZero; 2489 // 2490 // C++ [dcl.init]p9: 2491 // 2492 // If no initializer is specified for an object, and the 2493 // object is of (possibly cv-qualified) non-POD class type (or 2494 // array thereof), the object shall be default-initialized; if 2495 // the object is of const-qualified type, the underlying class 2496 // type shall have a user-declared default 2497 // constructor. Otherwise, if no initializer is specified for 2498 // an object, the object and its subobjects, if any, have an 2499 // indeterminate initial value; if the object or any of its 2500 // subobjects are of const-qualified type, the program is 2501 // ill-formed. 2502 // 2503 // This isn't technically an error in C, so we don't diagnose it. 2504 // 2505 // FIXME: Actually perform the POD/user-defined default 2506 // constructor check. 2507 if (getLangOptions().CPlusPlus && 2508 Context.getCanonicalType(Type).isConstQualified() && 2509 Var->getStorageClass() != VarDecl::Extern) 2510 Diag(Var->getLocation(), diag::err_const_var_requires_init) 2511 << Var->getName() 2512 << SourceRange(Var->getLocation(), Var->getLocation()); 2513#endif 2514 } 2515} 2516 2517Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, DeclPtrTy *Group, 2518 unsigned NumDecls) { 2519 llvm::SmallVector<Decl*, 8> Decls; 2520 2521 for (unsigned i = 0; i != NumDecls; ++i) 2522 if (Decl *D = Group[i].getAs<Decl>()) 2523 Decls.push_back(D); 2524 2525 // Perform semantic analysis that depends on having fully processed both 2526 // the declarator and initializer. 2527 for (unsigned i = 0, e = Decls.size(); i != e; ++i) { 2528 VarDecl *IDecl = dyn_cast<VarDecl>(Decls[i]); 2529 if (!IDecl) 2530 continue; 2531 QualType T = IDecl->getType(); 2532 2533 // Block scope. C99 6.7p7: If an identifier for an object is declared with 2534 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 2535 if (IDecl->isBlockVarDecl() && 2536 IDecl->getStorageClass() != VarDecl::Extern) { 2537 if (!IDecl->isInvalidDecl() && 2538 RequireCompleteType(IDecl->getLocation(), T, 2539 diag::err_typecheck_decl_incomplete_type)) 2540 IDecl->setInvalidDecl(); 2541 } 2542 // File scope. C99 6.9.2p2: A declaration of an identifier for and 2543 // object that has file scope without an initializer, and without a 2544 // storage-class specifier or with the storage-class specifier "static", 2545 // constitutes a tentative definition. Note: A tentative definition with 2546 // external linkage is valid (C99 6.2.2p5). 2547 if (IDecl->isTentativeDefinition(Context)) { 2548 QualType CheckType = T; 2549 unsigned DiagID = diag::err_typecheck_decl_incomplete_type; 2550 2551 const IncompleteArrayType *ArrayT = Context.getAsIncompleteArrayType(T); 2552 if (ArrayT) { 2553 CheckType = ArrayT->getElementType(); 2554 DiagID = diag::err_illegal_decl_array_incomplete_type; 2555 } 2556 2557 if (IDecl->isInvalidDecl()) { 2558 // Do nothing with invalid declarations 2559 } else if ((ArrayT || IDecl->getStorageClass() == VarDecl::Static) && 2560 RequireCompleteType(IDecl->getLocation(), CheckType, DiagID)) { 2561 // C99 6.9.2p3: If the declaration of an identifier for an object is 2562 // a tentative definition and has internal linkage (C99 6.2.2p3), the 2563 // declared type shall not be an incomplete type. 2564 IDecl->setInvalidDecl(); 2565 } 2566 } 2567 } 2568 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 2569 &Decls[0], NumDecls)); 2570} 2571 2572 2573/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 2574/// to introduce parameters into function prototype scope. 2575Sema::DeclPtrTy 2576Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 2577 const DeclSpec &DS = D.getDeclSpec(); 2578 2579 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 2580 VarDecl::StorageClass StorageClass = VarDecl::None; 2581 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2582 StorageClass = VarDecl::Register; 2583 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2584 Diag(DS.getStorageClassSpecLoc(), 2585 diag::err_invalid_storage_class_in_func_decl); 2586 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2587 } 2588 if (DS.isThreadSpecified()) { 2589 Diag(DS.getThreadSpecLoc(), 2590 diag::err_invalid_storage_class_in_func_decl); 2591 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2592 } 2593 2594 // Check that there are no default arguments inside the type of this 2595 // parameter (C++ only). 2596 if (getLangOptions().CPlusPlus) 2597 CheckExtraCXXDefaultArguments(D); 2598 2599 // In this context, we *do not* check D.getInvalidType(). If the declarator 2600 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 2601 // though it will not reflect the user specified type. 2602 QualType parmDeclType = GetTypeForDeclarator(D, S); 2603 2604 assert(!parmDeclType.isNull() && "GetTypeForDeclarator() returned null type"); 2605 2606 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 2607 // Can this happen for params? We already checked that they don't conflict 2608 // among each other. Here they can only shadow globals, which is ok. 2609 IdentifierInfo *II = D.getIdentifier(); 2610 if (II) { 2611 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2612 if (PrevDecl->isTemplateParameter()) { 2613 // Maybe we will complain about the shadowed template parameter. 2614 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2615 // Just pretend that we didn't see the previous declaration. 2616 PrevDecl = 0; 2617 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 2618 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 2619 2620 // Recover by removing the name 2621 II = 0; 2622 D.SetIdentifier(0, D.getIdentifierLoc()); 2623 } 2624 } 2625 } 2626 2627 // Parameters can not be abstract class types. 2628 // For record types, this is done by the AbstractClassUsageDiagnoser once 2629 // the class has been completely parsed. 2630 if (!CurContext->isRecord() && 2631 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 2632 diag::err_abstract_type_in_decl, 2633 AbstractParamType)) 2634 D.setInvalidType(true); 2635 2636 QualType T = adjustParameterType(parmDeclType); 2637 2638 ParmVarDecl *New; 2639 if (T == parmDeclType) // parameter type did not need adjustment 2640 New = ParmVarDecl::Create(Context, CurContext, 2641 D.getIdentifierLoc(), II, 2642 parmDeclType, StorageClass, 2643 0); 2644 else // keep track of both the adjusted and unadjusted types 2645 New = OriginalParmVarDecl::Create(Context, CurContext, 2646 D.getIdentifierLoc(), II, T, 2647 parmDeclType, StorageClass, 0); 2648 2649 if (D.getInvalidType()) 2650 New->setInvalidDecl(); 2651 2652 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 2653 if (D.getCXXScopeSpec().isSet()) { 2654 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 2655 << D.getCXXScopeSpec().getRange(); 2656 New->setInvalidDecl(); 2657 } 2658 // Parameter declarators cannot be interface types. All ObjC objects are 2659 // passed by reference. 2660 if (T->isObjCInterfaceType()) { 2661 Diag(D.getIdentifierLoc(), diag::err_object_cannot_be_by_value) 2662 << "passed"; 2663 New->setInvalidDecl(); 2664 } 2665 2666 // Add the parameter declaration into this scope. 2667 S->AddDecl(DeclPtrTy::make(New)); 2668 if (II) 2669 IdResolver.AddDecl(New); 2670 2671 ProcessDeclAttributes(New, D); 2672 return DeclPtrTy::make(New); 2673} 2674 2675void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D) { 2676 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2677 "Not a function declarator!"); 2678 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2679 2680 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 2681 // for a K&R function. 2682 if (!FTI.hasPrototype) { 2683 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2684 if (FTI.ArgInfo[i].Param == 0) { 2685 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 2686 << FTI.ArgInfo[i].Ident; 2687 // Implicitly declare the argument as type 'int' for lack of a better 2688 // type. 2689 DeclSpec DS; 2690 const char* PrevSpec; // unused 2691 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 2692 PrevSpec); 2693 Declarator ParamD(DS, Declarator::KNRTypeListContext); 2694 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 2695 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 2696 } 2697 } 2698 } 2699} 2700 2701Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 2702 Declarator &D) { 2703 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 2704 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2705 "Not a function declarator!"); 2706 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2707 2708 if (FTI.hasPrototype) { 2709 // FIXME: Diagnose arguments without names in C. 2710 } 2711 2712 Scope *ParentScope = FnBodyScope->getParent(); 2713 2714 DeclPtrTy DP = ActOnDeclarator(ParentScope, D, /*IsFunctionDefinition=*/true); 2715 return ActOnStartOfFunctionDef(FnBodyScope, DP); 2716} 2717 2718Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 2719 FunctionDecl *FD = cast<FunctionDecl>(D.getAs<Decl>()); 2720 2721 // See if this is a redefinition. 2722 const FunctionDecl *Definition; 2723 if (FD->getBody(Definition)) { 2724 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 2725 Diag(Definition->getLocation(), diag::note_previous_definition); 2726 } 2727 2728 // Builtin functions cannot be defined. 2729 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 2730 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2731 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 2732 FD->setInvalidDecl(); 2733 } 2734 } 2735 2736 // The return type of a function definition must be complete 2737 // (C99 6.9.1p3, C++ [dcl.fct]p6). 2738 QualType ResultType = FD->getResultType(); 2739 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 2740 RequireCompleteType(FD->getLocation(), ResultType, 2741 diag::err_func_def_incomplete_result)) 2742 FD->setInvalidDecl(); 2743 2744 // GNU warning -Wmissing-prototypes: 2745 // Warn if a global function is defined without a previous 2746 // prototype declaration. This warning is issued even if the 2747 // definition itself provides a prototype. The aim is to detect 2748 // global functions that fail to be declared in header files. 2749 if (!FD->isInvalidDecl() && FD->isGlobal() && !isa<CXXMethodDecl>(FD)) { 2750 bool MissingPrototype = true; 2751 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 2752 Prev; Prev = Prev->getPreviousDeclaration()) { 2753 // Ignore any declarations that occur in function or method 2754 // scope, because they aren't visible from the header. 2755 if (Prev->getDeclContext()->isFunctionOrMethod()) 2756 continue; 2757 2758 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 2759 break; 2760 } 2761 2762 if (MissingPrototype) 2763 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 2764 } 2765 2766 PushDeclContext(FnBodyScope, FD); 2767 2768 // Check the validity of our function parameters 2769 CheckParmsForFunctionDef(FD); 2770 2771 // Introduce our parameters into the function scope 2772 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 2773 ParmVarDecl *Param = FD->getParamDecl(p); 2774 Param->setOwningFunction(FD); 2775 2776 // If this has an identifier, add it to the scope stack. 2777 if (Param->getIdentifier()) 2778 PushOnScopeChains(Param, FnBodyScope); 2779 } 2780 2781 // Checking attributes of current function definition 2782 // dllimport attribute. 2783 if (FD->getAttr<DLLImportAttr>() && (!FD->getAttr<DLLExportAttr>())) { 2784 // dllimport attribute cannot be applied to definition. 2785 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 2786 Diag(FD->getLocation(), 2787 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 2788 << "dllimport"; 2789 FD->setInvalidDecl(); 2790 return DeclPtrTy::make(FD); 2791 } else { 2792 // If a symbol previously declared dllimport is later defined, the 2793 // attribute is ignored in subsequent references, and a warning is 2794 // emitted. 2795 Diag(FD->getLocation(), 2796 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 2797 << FD->getNameAsCString() << "dllimport"; 2798 } 2799 } 2800 return DeclPtrTy::make(FD); 2801} 2802 2803static bool StatementCreatesScope(Stmt* S) { 2804 bool result = false; 2805 if (DeclStmt* DS = dyn_cast<DeclStmt>(S)) { 2806 for (DeclStmt::decl_iterator i = DS->decl_begin(); 2807 i != DS->decl_end(); ++i) { 2808 if (VarDecl* D = dyn_cast<VarDecl>(*i)) { 2809 result |= D->getType()->isVariablyModifiedType(); 2810 result |= !!D->getAttr<CleanupAttr>(); 2811 } else if (TypedefDecl* D = dyn_cast<TypedefDecl>(*i)) { 2812 result |= D->getUnderlyingType()->isVariablyModifiedType(); 2813 } 2814 } 2815 } 2816 2817 return result; 2818} 2819 2820void Sema::RecursiveCalcLabelScopes(llvm::DenseMap<Stmt*, void*>& LabelScopeMap, 2821 llvm::DenseMap<void*, Stmt*>& PopScopeMap, 2822 std::vector<void*>& ScopeStack, 2823 Stmt* CurStmt, 2824 Stmt* ParentCompoundStmt) { 2825 for (Stmt::child_iterator i = CurStmt->child_begin(); 2826 i != CurStmt->child_end(); ++i) { 2827 if (!*i) continue; 2828 if (StatementCreatesScope(*i)) { 2829 ScopeStack.push_back(*i); 2830 PopScopeMap[*i] = ParentCompoundStmt; 2831 } else if (isa<LabelStmt>(CurStmt)) { 2832 LabelScopeMap[CurStmt] = ScopeStack.size() ? ScopeStack.back() : 0; 2833 } 2834 if (isa<DeclStmt>(*i)) continue; 2835 Stmt* CurCompound = isa<CompoundStmt>(*i) ? *i : ParentCompoundStmt; 2836 RecursiveCalcLabelScopes(LabelScopeMap, PopScopeMap, ScopeStack, 2837 *i, CurCompound); 2838 } 2839 2840 while (ScopeStack.size() && PopScopeMap[ScopeStack.back()] == CurStmt) { 2841 ScopeStack.pop_back(); 2842 } 2843} 2844 2845void Sema::RecursiveCalcJumpScopes(llvm::DenseMap<Stmt*, void*>& LabelScopeMap, 2846 llvm::DenseMap<void*, Stmt*>& PopScopeMap, 2847 llvm::DenseMap<Stmt*, void*>& GotoScopeMap, 2848 std::vector<void*>& ScopeStack, 2849 Stmt* CurStmt) { 2850 for (Stmt::child_iterator i = CurStmt->child_begin(); 2851 i != CurStmt->child_end(); ++i) { 2852 if (!*i) continue; 2853 if (StatementCreatesScope(*i)) { 2854 ScopeStack.push_back(*i); 2855 } else if (GotoStmt* GS = dyn_cast<GotoStmt>(*i)) { 2856 void* LScope = LabelScopeMap[GS->getLabel()]; 2857 if (LScope) { 2858 bool foundScopeInStack = false; 2859 for (unsigned i = ScopeStack.size(); i > 0; --i) { 2860 if (LScope == ScopeStack[i-1]) { 2861 foundScopeInStack = true; 2862 break; 2863 } 2864 } 2865 if (!foundScopeInStack) { 2866 Diag(GS->getSourceRange().getBegin(), diag::err_goto_into_scope); 2867 } 2868 } 2869 } 2870 if (isa<DeclStmt>(*i)) continue; 2871 RecursiveCalcJumpScopes(LabelScopeMap, PopScopeMap, GotoScopeMap, 2872 ScopeStack, *i); 2873 } 2874 2875 while (ScopeStack.size() && PopScopeMap[ScopeStack.back()] == CurStmt) { 2876 ScopeStack.pop_back(); 2877 } 2878} 2879 2880Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 2881 Decl *dcl = D.getAs<Decl>(); 2882 Stmt *Body = static_cast<Stmt*>(BodyArg.release()); 2883 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 2884 FD->setBody(cast<CompoundStmt>(Body)); 2885 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 2886 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 2887 assert(MD == getCurMethodDecl() && "Method parsing confused"); 2888 MD->setBody(cast<CompoundStmt>(Body)); 2889 } else { 2890 Body->Destroy(Context); 2891 return DeclPtrTy(); 2892 } 2893 PopDeclContext(); 2894 // Verify and clean out per-function state. 2895 2896 bool HaveLabels = !LabelMap.empty(); 2897 // Check goto/label use. 2898 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 2899 I = LabelMap.begin(), E = LabelMap.end(); I != E; ++I) { 2900 // Verify that we have no forward references left. If so, there was a goto 2901 // or address of a label taken, but no definition of it. Label fwd 2902 // definitions are indicated with a null substmt. 2903 if (I->second->getSubStmt() == 0) { 2904 LabelStmt *L = I->second; 2905 // Emit error. 2906 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 2907 2908 // At this point, we have gotos that use the bogus label. Stitch it into 2909 // the function body so that they aren't leaked and that the AST is well 2910 // formed. 2911 if (Body) { 2912#if 0 2913 // FIXME: Why do this? Having a 'push_back' in CompoundStmt is ugly, 2914 // and the AST is malformed anyway. We should just blow away 'L'. 2915 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 2916 cast<CompoundStmt>(Body)->push_back(L); 2917#else 2918 L->Destroy(Context); 2919#endif 2920 } else { 2921 // The whole function wasn't parsed correctly, just delete this. 2922 L->Destroy(Context); 2923 } 2924 } 2925 } 2926 LabelMap.clear(); 2927 2928 if (!Body) return D; 2929 2930 if (HaveLabels) { 2931 llvm::DenseMap<Stmt*, void*> LabelScopeMap; 2932 llvm::DenseMap<void*, Stmt*> PopScopeMap; 2933 llvm::DenseMap<Stmt*, void*> GotoScopeMap; 2934 std::vector<void*> ScopeStack; 2935 RecursiveCalcLabelScopes(LabelScopeMap, PopScopeMap, ScopeStack, Body, Body); 2936 RecursiveCalcJumpScopes(LabelScopeMap, PopScopeMap, GotoScopeMap, ScopeStack, Body); 2937 } 2938 2939 return D; 2940} 2941 2942/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 2943/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 2944NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 2945 IdentifierInfo &II, Scope *S) { 2946 // Before we produce a declaration for an implicitly defined 2947 // function, see whether there was a locally-scoped declaration of 2948 // this name as a function or variable. If so, use that 2949 // (non-visible) declaration, and complain about it. 2950 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2951 = LocallyScopedExternalDecls.find(&II); 2952 if (Pos != LocallyScopedExternalDecls.end()) { 2953 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 2954 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 2955 return Pos->second; 2956 } 2957 2958 // Extension in C99. Legal in C90, but warn about it. 2959 if (getLangOptions().C99) 2960 Diag(Loc, diag::ext_implicit_function_decl) << &II; 2961 else 2962 Diag(Loc, diag::warn_implicit_function_decl) << &II; 2963 2964 // FIXME: handle stuff like: 2965 // void foo() { extern float X(); } 2966 // void bar() { X(); } <-- implicit decl for X in another scope. 2967 2968 // Set a Declarator for the implicit definition: int foo(); 2969 const char *Dummy; 2970 DeclSpec DS; 2971 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 2972 Error = Error; // Silence warning. 2973 assert(!Error && "Error setting up implicit decl!"); 2974 Declarator D(DS, Declarator::BlockContext); 2975 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 2976 0, 0, 0, Loc, D), 2977 SourceLocation()); 2978 D.SetIdentifier(&II, Loc); 2979 2980 // Insert this function into translation-unit scope. 2981 2982 DeclContext *PrevDC = CurContext; 2983 CurContext = Context.getTranslationUnitDecl(); 2984 2985 FunctionDecl *FD = 2986 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D, DeclPtrTy()).getAs<Decl>()); 2987 FD->setImplicit(); 2988 2989 CurContext = PrevDC; 2990 2991 AddKnownFunctionAttributes(FD); 2992 2993 return FD; 2994} 2995 2996/// \brief Adds any function attributes that we know a priori based on 2997/// the declaration of this function. 2998/// 2999/// These attributes can apply both to implicitly-declared builtins 3000/// (like __builtin___printf_chk) or to library-declared functions 3001/// like NSLog or printf. 3002void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 3003 if (FD->isInvalidDecl()) 3004 return; 3005 3006 // If this is a built-in function, map its builtin attributes to 3007 // actual attributes. 3008 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 3009 // Handle printf-formatting attributes. 3010 unsigned FormatIdx; 3011 bool HasVAListArg; 3012 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 3013 if (!FD->getAttr<FormatAttr>()) 3014 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 3015 FormatIdx + 2)); 3016 } 3017 3018 // Mark const if we don't care about errno and that is the only 3019 // thing preventing the function from being const. This allows 3020 // IRgen to use LLVM intrinsics for such functions. 3021 if (!getLangOptions().MathErrno && 3022 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 3023 if (!FD->getAttr<ConstAttr>()) 3024 FD->addAttr(::new (Context) ConstAttr()); 3025 } 3026 } 3027 3028 IdentifierInfo *Name = FD->getIdentifier(); 3029 if (!Name) 3030 return; 3031 if ((!getLangOptions().CPlusPlus && 3032 FD->getDeclContext()->isTranslationUnit()) || 3033 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 3034 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 3035 LinkageSpecDecl::lang_c)) { 3036 // Okay: this could be a libc/libm/Objective-C function we know 3037 // about. 3038 } else 3039 return; 3040 3041 unsigned KnownID; 3042 for (KnownID = 0; KnownID != id_num_known_functions; ++KnownID) 3043 if (KnownFunctionIDs[KnownID] == Name) 3044 break; 3045 3046 switch (KnownID) { 3047 case id_NSLog: 3048 case id_NSLogv: 3049 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 3050 // FIXME: We known better than our headers. 3051 const_cast<FormatAttr *>(Format)->setType("printf"); 3052 } else 3053 FD->addAttr(::new (Context) FormatAttr("printf", 1, 2)); 3054 break; 3055 3056 case id_asprintf: 3057 case id_vasprintf: 3058 if (!FD->getAttr<FormatAttr>()) 3059 FD->addAttr(::new (Context) FormatAttr("printf", 2, 3)); 3060 break; 3061 3062 default: 3063 // Unknown function or known function without any attributes to 3064 // add. Do nothing. 3065 break; 3066 } 3067} 3068 3069TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T) { 3070 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 3071 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3072 3073 // Scope manipulation handled by caller. 3074 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 3075 D.getIdentifierLoc(), 3076 D.getIdentifier(), 3077 T); 3078 3079 if (TagType *TT = dyn_cast<TagType>(T)) { 3080 TagDecl *TD = TT->getDecl(); 3081 3082 // If the TagDecl that the TypedefDecl points to is an anonymous decl 3083 // keep track of the TypedefDecl. 3084 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 3085 TD->setTypedefForAnonDecl(NewTD); 3086 } 3087 3088 if (D.getInvalidType()) 3089 NewTD->setInvalidDecl(); 3090 return NewTD; 3091} 3092 3093/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 3094/// former case, Name will be non-null. In the later case, Name will be null. 3095/// TagSpec indicates what kind of tag this is. TK indicates whether this is a 3096/// reference/declaration/definition of a tag. 3097Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, 3098 SourceLocation KWLoc, const CXXScopeSpec &SS, 3099 IdentifierInfo *Name, SourceLocation NameLoc, 3100 AttributeList *Attr, AccessSpecifier AS) { 3101 // If this is not a definition, it must have a name. 3102 assert((Name != 0 || TK == TK_Definition) && 3103 "Nameless record must be a definition!"); 3104 3105 TagDecl::TagKind Kind; 3106 switch (TagSpec) { 3107 default: assert(0 && "Unknown tag type!"); 3108 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 3109 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 3110 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 3111 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 3112 } 3113 3114 DeclContext *SearchDC = CurContext; 3115 DeclContext *DC = CurContext; 3116 NamedDecl *PrevDecl = 0; 3117 3118 bool Invalid = false; 3119 3120 if (Name && SS.isNotEmpty()) { 3121 // We have a nested-name tag ('struct foo::bar'). 3122 3123 // Check for invalid 'foo::'. 3124 if (SS.isInvalid()) { 3125 Name = 0; 3126 goto CreateNewDecl; 3127 } 3128 3129 // FIXME: RequireCompleteDeclContext(SS)? 3130 DC = computeDeclContext(SS); 3131 SearchDC = DC; 3132 // Look-up name inside 'foo::'. 3133 PrevDecl = dyn_cast_or_null<TagDecl>( 3134 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 3135 3136 // A tag 'foo::bar' must already exist. 3137 if (PrevDecl == 0) { 3138 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 3139 Name = 0; 3140 goto CreateNewDecl; 3141 } 3142 } else if (Name) { 3143 // If this is a named struct, check to see if there was a previous forward 3144 // declaration or definition. 3145 // FIXME: We're looking into outer scopes here, even when we 3146 // shouldn't be. Doing so can result in ambiguities that we 3147 // shouldn't be diagnosing. 3148 LookupResult R = LookupName(S, Name, LookupTagName, 3149 /*RedeclarationOnly=*/(TK != TK_Reference)); 3150 if (R.isAmbiguous()) { 3151 DiagnoseAmbiguousLookup(R, Name, NameLoc); 3152 // FIXME: This is not best way to recover from case like: 3153 // 3154 // struct S s; 3155 // 3156 // causes needless err_ovl_no_viable_function_in_init latter. 3157 Name = 0; 3158 PrevDecl = 0; 3159 Invalid = true; 3160 } 3161 else 3162 PrevDecl = R; 3163 3164 if (!getLangOptions().CPlusPlus && TK != TK_Reference) { 3165 // FIXME: This makes sure that we ignore the contexts associated 3166 // with C structs, unions, and enums when looking for a matching 3167 // tag declaration or definition. See the similar lookup tweak 3168 // in Sema::LookupName; is there a better way to deal with this? 3169 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 3170 SearchDC = SearchDC->getParent(); 3171 } 3172 } 3173 3174 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3175 // Maybe we will complain about the shadowed template parameter. 3176 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 3177 // Just pretend that we didn't see the previous declaration. 3178 PrevDecl = 0; 3179 } 3180 3181 if (PrevDecl) { 3182 // Check whether the previous declaration is usable. 3183 (void)DiagnoseUseOfDecl(PrevDecl, NameLoc); 3184 3185 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 3186 // If this is a use of a previous tag, or if the tag is already declared 3187 // in the same scope (so that the definition/declaration completes or 3188 // rementions the tag), reuse the decl. 3189 if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { 3190 // Make sure that this wasn't declared as an enum and now used as a 3191 // struct or something similar. 3192 if (PrevTagDecl->getTagKind() != Kind) { 3193 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 3194 Diag(PrevDecl->getLocation(), diag::note_previous_use); 3195 // Recover by making this an anonymous redefinition. 3196 Name = 0; 3197 PrevDecl = 0; 3198 Invalid = true; 3199 } else { 3200 // If this is a use, just return the declaration we found. 3201 3202 // FIXME: In the future, return a variant or some other clue 3203 // for the consumer of this Decl to know it doesn't own it. 3204 // For our current ASTs this shouldn't be a problem, but will 3205 // need to be changed with DeclGroups. 3206 if (TK == TK_Reference) 3207 return DeclPtrTy::make(PrevDecl); 3208 3209 // Diagnose attempts to redefine a tag. 3210 if (TK == TK_Definition) { 3211 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 3212 Diag(NameLoc, diag::err_redefinition) << Name; 3213 Diag(Def->getLocation(), diag::note_previous_definition); 3214 // If this is a redefinition, recover by making this 3215 // struct be anonymous, which will make any later 3216 // references get the previous definition. 3217 Name = 0; 3218 PrevDecl = 0; 3219 Invalid = true; 3220 } else { 3221 // If the type is currently being defined, complain 3222 // about a nested redefinition. 3223 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 3224 if (Tag->isBeingDefined()) { 3225 Diag(NameLoc, diag::err_nested_redefinition) << Name; 3226 Diag(PrevTagDecl->getLocation(), 3227 diag::note_previous_definition); 3228 Name = 0; 3229 PrevDecl = 0; 3230 Invalid = true; 3231 } 3232 } 3233 3234 // Okay, this is definition of a previously declared or referenced 3235 // tag PrevDecl. We're going to create a new Decl for it. 3236 } 3237 } 3238 // If we get here we have (another) forward declaration or we 3239 // have a definition. Just create a new decl. 3240 } else { 3241 // If we get here, this is a definition of a new tag type in a nested 3242 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 3243 // new decl/type. We set PrevDecl to NULL so that the entities 3244 // have distinct types. 3245 PrevDecl = 0; 3246 } 3247 // If we get here, we're going to create a new Decl. If PrevDecl 3248 // is non-NULL, it's a definition of the tag declared by 3249 // PrevDecl. If it's NULL, we have a new definition. 3250 } else { 3251 // PrevDecl is a namespace, template, or anything else 3252 // that lives in the IDNS_Tag identifier namespace. 3253 if (isDeclInScope(PrevDecl, SearchDC, S)) { 3254 // The tag name clashes with a namespace name, issue an error and 3255 // recover by making this tag be anonymous. 3256 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 3257 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3258 Name = 0; 3259 PrevDecl = 0; 3260 Invalid = true; 3261 } else { 3262 // The existing declaration isn't relevant to us; we're in a 3263 // new scope, so clear out the previous declaration. 3264 PrevDecl = 0; 3265 } 3266 } 3267 } else if (TK == TK_Reference && SS.isEmpty() && Name && 3268 (Kind != TagDecl::TK_enum || !getLangOptions().CPlusPlus)) { 3269 // C.scope.pdecl]p5: 3270 // -- for an elaborated-type-specifier of the form 3271 // 3272 // class-key identifier 3273 // 3274 // if the elaborated-type-specifier is used in the 3275 // decl-specifier-seq or parameter-declaration-clause of a 3276 // function defined in namespace scope, the identifier is 3277 // declared as a class-name in the namespace that contains 3278 // the declaration; otherwise, except as a friend 3279 // declaration, the identifier is declared in the smallest 3280 // non-class, non-function-prototype scope that contains the 3281 // declaration. 3282 // 3283 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 3284 // C structs and unions. 3285 // 3286 // GNU C also supports this behavior as part of its incomplete 3287 // enum types extension, while GNU C++ does not. 3288 // 3289 // Find the context where we'll be declaring the tag. 3290 // FIXME: We would like to maintain the current DeclContext as the 3291 // lexical context, 3292 while (SearchDC->isRecord()) 3293 SearchDC = SearchDC->getParent(); 3294 3295 // Find the scope where we'll be declaring the tag. 3296 while (S->isClassScope() || 3297 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 3298 ((S->getFlags() & Scope::DeclScope) == 0) || 3299 (S->getEntity() && 3300 ((DeclContext *)S->getEntity())->isTransparentContext())) 3301 S = S->getParent(); 3302 } 3303 3304CreateNewDecl: 3305 3306 // If there is an identifier, use the location of the identifier as the 3307 // location of the decl, otherwise use the location of the struct/union 3308 // keyword. 3309 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 3310 3311 // Otherwise, create a new declaration. If there is a previous 3312 // declaration of the same entity, the two will be linked via 3313 // PrevDecl. 3314 TagDecl *New; 3315 3316 if (Kind == TagDecl::TK_enum) { 3317 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3318 // enum X { A, B, C } D; D should chain to X. 3319 New = EnumDecl::Create(Context, SearchDC, Loc, Name, 3320 cast_or_null<EnumDecl>(PrevDecl)); 3321 // If this is an undefined enum, warn. 3322 if (TK != TK_Definition && !Invalid) { 3323 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 3324 : diag::ext_forward_ref_enum; 3325 Diag(Loc, DK); 3326 } 3327 } else { 3328 // struct/union/class 3329 3330 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3331 // struct X { int A; } D; D should chain to X. 3332 if (getLangOptions().CPlusPlus) 3333 // FIXME: Look for a way to use RecordDecl for simple structs. 3334 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3335 cast_or_null<CXXRecordDecl>(PrevDecl)); 3336 else 3337 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3338 cast_or_null<RecordDecl>(PrevDecl)); 3339 } 3340 3341 if (Kind != TagDecl::TK_enum) { 3342 // Handle #pragma pack: if the #pragma pack stack has non-default 3343 // alignment, make up a packed attribute for this decl. These 3344 // attributes are checked when the ASTContext lays out the 3345 // structure. 3346 // 3347 // It is important for implementing the correct semantics that this 3348 // happen here (in act on tag decl). The #pragma pack stack is 3349 // maintained as a result of parser callbacks which can occur at 3350 // many points during the parsing of a struct declaration (because 3351 // the #pragma tokens are effectively skipped over during the 3352 // parsing of the struct). 3353 if (unsigned Alignment = getPragmaPackAlignment()) 3354 New->addAttr(::new (Context) PackedAttr(Alignment * 8)); 3355 } 3356 3357 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 3358 // C++ [dcl.typedef]p3: 3359 // [...] Similarly, in a given scope, a class or enumeration 3360 // shall not be declared with the same name as a typedef-name 3361 // that is declared in that scope and refers to a type other 3362 // than the class or enumeration itself. 3363 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 3364 TypedefDecl *PrevTypedef = 0; 3365 if (Lookup.getKind() == LookupResult::Found) 3366 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 3367 3368 if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && 3369 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 3370 Context.getCanonicalType(Context.getTypeDeclType(New))) { 3371 Diag(Loc, diag::err_tag_definition_of_typedef) 3372 << Context.getTypeDeclType(New) 3373 << PrevTypedef->getUnderlyingType(); 3374 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 3375 Invalid = true; 3376 } 3377 } 3378 3379 if (Invalid) 3380 New->setInvalidDecl(); 3381 3382 if (Attr) 3383 ProcessDeclAttributeList(New, Attr); 3384 3385 // If we're declaring or defining a tag in function prototype scope 3386 // in C, note that this type can only be used within the function. 3387 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 3388 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 3389 3390 // Set the lexical context. If the tag has a C++ scope specifier, the 3391 // lexical context will be different from the semantic context. 3392 New->setLexicalDeclContext(CurContext); 3393 3394 // Set the access specifier. 3395 SetMemberAccessSpecifier(New, PrevDecl, AS); 3396 3397 if (TK == TK_Definition) 3398 New->startDefinition(); 3399 3400 // If this has an identifier, add it to the scope stack. 3401 if (Name) { 3402 S = getNonFieldDeclScope(S); 3403 PushOnScopeChains(New, S); 3404 } else { 3405 CurContext->addDecl(New); 3406 } 3407 3408 return DeclPtrTy::make(New); 3409} 3410 3411void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 3412 AdjustDeclIfTemplate(TagD); 3413 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 3414 3415 // Enter the tag context. 3416 PushDeclContext(S, Tag); 3417 3418 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 3419 FieldCollector->StartClass(); 3420 3421 if (Record->getIdentifier()) { 3422 // C++ [class]p2: 3423 // [...] The class-name is also inserted into the scope of the 3424 // class itself; this is known as the injected-class-name. For 3425 // purposes of access checking, the injected-class-name is treated 3426 // as if it were a public member name. 3427 CXXRecordDecl *InjectedClassName 3428 = CXXRecordDecl::Create(Context, Record->getTagKind(), 3429 CurContext, Record->getLocation(), 3430 Record->getIdentifier(), Record); 3431 InjectedClassName->setImplicit(); 3432 InjectedClassName->setAccess(AS_public); 3433 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 3434 InjectedClassName->setDescribedClassTemplate(Template); 3435 PushOnScopeChains(InjectedClassName, S); 3436 assert(InjectedClassName->isInjectedClassName() && 3437 "Broken injected-class-name"); 3438 } 3439 } 3440} 3441 3442void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD) { 3443 AdjustDeclIfTemplate(TagD); 3444 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 3445 3446 if (isa<CXXRecordDecl>(Tag)) 3447 FieldCollector->FinishClass(); 3448 3449 // Exit this scope of this tag's definition. 3450 PopDeclContext(); 3451 3452 // Notify the consumer that we've defined a tag. 3453 Consumer.HandleTagDeclDefinition(Tag); 3454} 3455 3456bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 3457 QualType FieldTy, const Expr *BitWidth) { 3458 // C99 6.7.2.1p4 - verify the field type. 3459 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 3460 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 3461 // Handle incomplete types with specific error. 3462 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 3463 return true; 3464 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 3465 << FieldName << FieldTy << BitWidth->getSourceRange(); 3466 } 3467 3468 // If the bit-width is type- or value-dependent, don't try to check 3469 // it now. 3470 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 3471 return false; 3472 3473 llvm::APSInt Value; 3474 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 3475 return true; 3476 3477 // Zero-width bitfield is ok for anonymous field. 3478 if (Value == 0 && FieldName) 3479 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 3480 3481 if (Value.isSigned() && Value.isNegative()) 3482 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 3483 << FieldName << Value.toString(10); 3484 3485 if (!FieldTy->isDependentType()) { 3486 uint64_t TypeSize = Context.getTypeSize(FieldTy); 3487 // FIXME: We won't need the 0 size once we check that the field type is valid. 3488 if (TypeSize && Value.getZExtValue() > TypeSize) 3489 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 3490 << FieldName << (unsigned)TypeSize; 3491 } 3492 3493 return false; 3494} 3495 3496/// ActOnField - Each field of a struct/union/class is passed into this in order 3497/// to create a FieldDecl object for it. 3498Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 3499 SourceLocation DeclStart, 3500 Declarator &D, ExprTy *BitfieldWidth) { 3501 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 3502 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 3503 AS_public); 3504 return DeclPtrTy::make(Res); 3505} 3506 3507/// HandleField - Analyze a field of a C struct or a C++ data member. 3508/// 3509FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 3510 SourceLocation DeclStart, 3511 Declarator &D, Expr *BitWidth, 3512 AccessSpecifier AS) { 3513 IdentifierInfo *II = D.getIdentifier(); 3514 SourceLocation Loc = DeclStart; 3515 if (II) Loc = D.getIdentifierLoc(); 3516 3517 QualType T = GetTypeForDeclarator(D, S); 3518 3519 if (getLangOptions().CPlusPlus) { 3520 CheckExtraCXXDefaultArguments(D); 3521 3522 if (D.getDeclSpec().isVirtualSpecified()) 3523 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3524 diag::err_virtual_non_function); 3525 } 3526 3527 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3528 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 3529 PrevDecl = 0; 3530 3531 FieldDecl *NewFD 3532 = CheckFieldDecl(II, T, Record, Loc, 3533 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable, 3534 BitWidth, AS, PrevDecl, &D); 3535 if (NewFD->isInvalidDecl() && PrevDecl) { 3536 // Don't introduce NewFD into scope; there's already something 3537 // with the same name in the same scope. 3538 } else if (II) { 3539 PushOnScopeChains(NewFD, S); 3540 } else 3541 Record->addDecl(NewFD); 3542 3543 return NewFD; 3544} 3545 3546/// \brief Build a new FieldDecl and check its well-formedness. 3547/// 3548/// This routine builds a new FieldDecl given the fields name, type, 3549/// record, etc. \p PrevDecl should refer to any previous declaration 3550/// with the same name and in the same scope as the field to be 3551/// created. 3552/// 3553/// \returns a new FieldDecl. 3554/// 3555/// \todo The Declarator argument is a hack. It will be removed once 3556FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 3557 RecordDecl *Record, SourceLocation Loc, 3558 bool Mutable, Expr *BitWidth, 3559 AccessSpecifier AS, NamedDecl *PrevDecl, 3560 Declarator *D) { 3561 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3562 bool InvalidDecl = false; 3563 3564 // If we receive a broken type, recover by assuming 'int' and 3565 // marking this declaration as invalid. 3566 if (T.isNull()) { 3567 InvalidDecl = true; 3568 T = Context.IntTy; 3569 } 3570 3571 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3572 // than a variably modified type. 3573 if (T->isVariablyModifiedType()) { 3574 bool SizeIsNegative; 3575 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 3576 SizeIsNegative); 3577 if (!FixedTy.isNull()) { 3578 Diag(Loc, diag::warn_illegal_constant_array_size); 3579 T = FixedTy; 3580 } else { 3581 if (SizeIsNegative) 3582 Diag(Loc, diag::err_typecheck_negative_array_size); 3583 else 3584 Diag(Loc, diag::err_typecheck_field_variable_size); 3585 T = Context.IntTy; 3586 InvalidDecl = true; 3587 } 3588 } 3589 3590 // Fields can not have abstract class types 3591 if (RequireNonAbstractType(Loc, T, diag::err_abstract_type_in_decl, 3592 AbstractFieldType)) 3593 InvalidDecl = true; 3594 3595 // If this is declared as a bit-field, check the bit-field. 3596 if (BitWidth && VerifyBitField(Loc, II, T, BitWidth)) { 3597 InvalidDecl = true; 3598 DeleteExpr(BitWidth); 3599 BitWidth = 0; 3600 } 3601 3602 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, BitWidth, 3603 Mutable); 3604 3605 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 3606 Diag(Loc, diag::err_duplicate_member) << II; 3607 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3608 NewFD->setInvalidDecl(); 3609 Record->setInvalidDecl(); 3610 } 3611 3612 if (getLangOptions().CPlusPlus && !T->isPODType()) 3613 cast<CXXRecordDecl>(Record)->setPOD(false); 3614 3615 // FIXME: We need to pass in the attributes given an AST 3616 // representation, not a parser representation. 3617 if (D) 3618 ProcessDeclAttributes(NewFD, *D); 3619 3620 if (T.isObjCGCWeak()) 3621 Diag(Loc, diag::warn_attribute_weak_on_field); 3622 3623 if (InvalidDecl) 3624 NewFD->setInvalidDecl(); 3625 3626 NewFD->setAccess(AS); 3627 3628 // C++ [dcl.init.aggr]p1: 3629 // An aggregate is an array or a class (clause 9) with [...] no 3630 // private or protected non-static data members (clause 11). 3631 // A POD must be an aggregate. 3632 if (getLangOptions().CPlusPlus && 3633 (AS == AS_private || AS == AS_protected)) { 3634 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 3635 CXXRecord->setAggregate(false); 3636 CXXRecord->setPOD(false); 3637 } 3638 3639 return NewFD; 3640} 3641 3642/// TranslateIvarVisibility - Translate visibility from a token ID to an 3643/// AST enum value. 3644static ObjCIvarDecl::AccessControl 3645TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 3646 switch (ivarVisibility) { 3647 default: assert(0 && "Unknown visitibility kind"); 3648 case tok::objc_private: return ObjCIvarDecl::Private; 3649 case tok::objc_public: return ObjCIvarDecl::Public; 3650 case tok::objc_protected: return ObjCIvarDecl::Protected; 3651 case tok::objc_package: return ObjCIvarDecl::Package; 3652 } 3653} 3654 3655/// ActOnIvar - Each ivar field of an objective-c class is passed into this 3656/// in order to create an IvarDecl object for it. 3657Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 3658 SourceLocation DeclStart, 3659 Declarator &D, ExprTy *BitfieldWidth, 3660 tok::ObjCKeywordKind Visibility) { 3661 3662 IdentifierInfo *II = D.getIdentifier(); 3663 Expr *BitWidth = (Expr*)BitfieldWidth; 3664 SourceLocation Loc = DeclStart; 3665 if (II) Loc = D.getIdentifierLoc(); 3666 3667 // FIXME: Unnamed fields can be handled in various different ways, for 3668 // example, unnamed unions inject all members into the struct namespace! 3669 3670 QualType T = GetTypeForDeclarator(D, S); 3671 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3672 bool InvalidDecl = false; 3673 3674 if (BitWidth) { 3675 // 6.7.2.1p3, 6.7.2.1p4 3676 if (VerifyBitField(Loc, II, T, BitWidth)) { 3677 InvalidDecl = true; 3678 DeleteExpr(BitWidth); 3679 BitWidth = 0; 3680 } 3681 } else { 3682 // Not a bitfield. 3683 3684 // validate II. 3685 3686 } 3687 3688 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3689 // than a variably modified type. 3690 if (T->isVariablyModifiedType()) { 3691 Diag(Loc, diag::err_typecheck_ivar_variable_size); 3692 InvalidDecl = true; 3693 } 3694 3695 // Get the visibility (access control) for this ivar. 3696 ObjCIvarDecl::AccessControl ac = 3697 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 3698 : ObjCIvarDecl::None; 3699 3700 // Construct the decl. 3701 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, CurContext, Loc, II, T,ac, 3702 (Expr *)BitfieldWidth); 3703 3704 if (II) { 3705 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3706 if (PrevDecl && isDeclInScope(PrevDecl, CurContext, S) 3707 && !isa<TagDecl>(PrevDecl)) { 3708 Diag(Loc, diag::err_duplicate_member) << II; 3709 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3710 NewID->setInvalidDecl(); 3711 } 3712 } 3713 3714 // Process attributes attached to the ivar. 3715 ProcessDeclAttributes(NewID, D); 3716 3717 if (D.getInvalidType() || InvalidDecl) 3718 NewID->setInvalidDecl(); 3719 3720 if (II) { 3721 // FIXME: When interfaces are DeclContexts, we'll need to add 3722 // these to the interface. 3723 S->AddDecl(DeclPtrTy::make(NewID)); 3724 IdResolver.AddDecl(NewID); 3725 } 3726 3727 return DeclPtrTy::make(NewID); 3728} 3729 3730void Sema::ActOnFields(Scope* S, 3731 SourceLocation RecLoc, DeclPtrTy RecDecl, 3732 DeclPtrTy *Fields, unsigned NumFields, 3733 SourceLocation LBrac, SourceLocation RBrac, 3734 AttributeList *Attr) { 3735 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 3736 assert(EnclosingDecl && "missing record or interface decl"); 3737 3738 // If the decl this is being inserted into is invalid, then it may be a 3739 // redeclaration or some other bogus case. Don't try to add fields to it. 3740 if (EnclosingDecl->isInvalidDecl()) { 3741 // FIXME: Deallocate fields? 3742 return; 3743 } 3744 3745 3746 // Verify that all the fields are okay. 3747 unsigned NumNamedMembers = 0; 3748 llvm::SmallVector<FieldDecl*, 32> RecFields; 3749 3750 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 3751 for (unsigned i = 0; i != NumFields; ++i) { 3752 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 3753 3754 // Get the type for the field. 3755 Type *FDTy = FD->getType().getTypePtr(); 3756 3757 if (!FD->isAnonymousStructOrUnion()) { 3758 // Remember all fields written by the user. 3759 RecFields.push_back(FD); 3760 } 3761 3762 // If the field is already invalid for some reason, don't emit more 3763 // diagnostics about it. 3764 if (FD->isInvalidDecl()) 3765 continue; 3766 3767 // C99 6.7.2.1p2: 3768 // A structure or union shall not contain a member with 3769 // incomplete or function type (hence, a structure shall not 3770 // contain an instance of itself, but may contain a pointer to 3771 // an instance of itself), except that the last member of a 3772 // structure with more than one named member may have incomplete 3773 // array type; such a structure (and any union containing, 3774 // possibly recursively, a member that is such a structure) 3775 // shall not be a member of a structure or an element of an 3776 // array. 3777 if (FDTy->isFunctionType()) { 3778 // Field declared as a function. 3779 Diag(FD->getLocation(), diag::err_field_declared_as_function) 3780 << FD->getDeclName(); 3781 FD->setInvalidDecl(); 3782 EnclosingDecl->setInvalidDecl(); 3783 continue; 3784 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 3785 Record && Record->isStruct()) { 3786 // Flexible array member. 3787 if (NumNamedMembers < 1) { 3788 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 3789 << FD->getDeclName(); 3790 FD->setInvalidDecl(); 3791 EnclosingDecl->setInvalidDecl(); 3792 continue; 3793 } 3794 // Okay, we have a legal flexible array member at the end of the struct. 3795 if (Record) 3796 Record->setHasFlexibleArrayMember(true); 3797 } else if (!FDTy->isDependentType() && 3798 RequireCompleteType(FD->getLocation(), FD->getType(), 3799 diag::err_field_incomplete)) { 3800 // Incomplete type 3801 FD->setInvalidDecl(); 3802 EnclosingDecl->setInvalidDecl(); 3803 continue; 3804 } else if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 3805 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 3806 // If this is a member of a union, then entire union becomes "flexible". 3807 if (Record && Record->isUnion()) { 3808 Record->setHasFlexibleArrayMember(true); 3809 } else { 3810 // If this is a struct/class and this is not the last element, reject 3811 // it. Note that GCC supports variable sized arrays in the middle of 3812 // structures. 3813 if (i != NumFields-1) 3814 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 3815 << FD->getDeclName(); 3816 else { 3817 // We support flexible arrays at the end of structs in 3818 // other structs as an extension. 3819 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 3820 << FD->getDeclName(); 3821 if (Record) 3822 Record->setHasFlexibleArrayMember(true); 3823 } 3824 } 3825 } 3826 } else if (FDTy->isObjCInterfaceType()) { 3827 /// A field cannot be an Objective-c object 3828 Diag(FD->getLocation(), diag::err_statically_allocated_object); 3829 FD->setInvalidDecl(); 3830 EnclosingDecl->setInvalidDecl(); 3831 continue; 3832 } 3833 // Keep track of the number of named members. 3834 if (FD->getIdentifier()) 3835 ++NumNamedMembers; 3836 } 3837 3838 // Okay, we successfully defined 'Record'. 3839 if (Record) { 3840 Record->completeDefinition(Context); 3841 } else { 3842 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 3843 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 3844 ID->setIVarList(ClsFields, RecFields.size(), Context); 3845 ID->setLocEnd(RBrac); 3846 3847 // Must enforce the rule that ivars in the base classes may not be 3848 // duplicates. 3849 if (ID->getSuperClass()) { 3850 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 3851 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 3852 ObjCIvarDecl* Ivar = (*IVI); 3853 IdentifierInfo *II = Ivar->getIdentifier(); 3854 ObjCIvarDecl* prevIvar = 3855 ID->getSuperClass()->lookupInstanceVariable(II); 3856 if (prevIvar) { 3857 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 3858 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 3859 } 3860 } 3861 } 3862 } else if (ObjCImplementationDecl *IMPDecl = 3863 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 3864 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 3865 IMPDecl->setIVarList(ClsFields, RecFields.size(), Context); 3866 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 3867 } 3868 } 3869 3870 if (Attr) 3871 ProcessDeclAttributeList(Record, Attr); 3872} 3873 3874EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 3875 EnumConstantDecl *LastEnumConst, 3876 SourceLocation IdLoc, 3877 IdentifierInfo *Id, 3878 ExprArg val) { 3879 Expr *Val = (Expr *)val.get(); 3880 3881 llvm::APSInt EnumVal(32); 3882 QualType EltTy; 3883 if (Val && !Val->isTypeDependent()) { 3884 // Make sure to promote the operand type to int. 3885 UsualUnaryConversions(Val); 3886 if (Val != val.get()) { 3887 val.release(); 3888 val = Val; 3889 } 3890 3891 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 3892 SourceLocation ExpLoc; 3893 if (!Val->isValueDependent() && 3894 VerifyIntegerConstantExpression(Val, &EnumVal)) { 3895 Val = 0; 3896 } else { 3897 EltTy = Val->getType(); 3898 } 3899 } 3900 3901 if (!Val) { 3902 if (LastEnumConst) { 3903 // Assign the last value + 1. 3904 EnumVal = LastEnumConst->getInitVal(); 3905 ++EnumVal; 3906 3907 // Check for overflow on increment. 3908 if (EnumVal < LastEnumConst->getInitVal()) 3909 Diag(IdLoc, diag::warn_enum_value_overflow); 3910 3911 EltTy = LastEnumConst->getType(); 3912 } else { 3913 // First value, set to zero. 3914 EltTy = Context.IntTy; 3915 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 3916 } 3917 } 3918 3919 val.release(); 3920 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 3921 Val, EnumVal); 3922} 3923 3924 3925Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 3926 DeclPtrTy lastEnumConst, 3927 SourceLocation IdLoc, 3928 IdentifierInfo *Id, 3929 SourceLocation EqualLoc, ExprTy *val) { 3930 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 3931 EnumConstantDecl *LastEnumConst = 3932 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 3933 Expr *Val = static_cast<Expr*>(val); 3934 3935 // The scope passed in may not be a decl scope. Zip up the scope tree until 3936 // we find one that is. 3937 S = getNonFieldDeclScope(S); 3938 3939 // Verify that there isn't already something declared with this name in this 3940 // scope. 3941 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 3942 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3943 // Maybe we will complain about the shadowed template parameter. 3944 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 3945 // Just pretend that we didn't see the previous declaration. 3946 PrevDecl = 0; 3947 } 3948 3949 if (PrevDecl) { 3950 // When in C++, we may get a TagDecl with the same name; in this case the 3951 // enum constant will 'hide' the tag. 3952 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 3953 "Received TagDecl when not in C++!"); 3954 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 3955 if (isa<EnumConstantDecl>(PrevDecl)) 3956 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 3957 else 3958 Diag(IdLoc, diag::err_redefinition) << Id; 3959 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3960 if (Val) Val->Destroy(Context); 3961 return DeclPtrTy(); 3962 } 3963 } 3964 3965 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 3966 IdLoc, Id, Owned(Val)); 3967 3968 // Register this decl in the current scope stack. 3969 if (New) 3970 PushOnScopeChains(New, S); 3971 3972 return DeclPtrTy::make(New); 3973} 3974 3975// FIXME: For consistency with ActOnFields(), we should have the parser 3976// pass in the source location for the left/right braces. 3977void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclPtrTy EnumDeclX, 3978 DeclPtrTy *Elements, unsigned NumElements) { 3979 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 3980 QualType EnumType = Context.getTypeDeclType(Enum); 3981 3982 // TODO: If the result value doesn't fit in an int, it must be a long or long 3983 // long value. ISO C does not support this, but GCC does as an extension, 3984 // emit a warning. 3985 unsigned IntWidth = Context.Target.getIntWidth(); 3986 3987 // Verify that all the values are okay, compute the size of the values, and 3988 // reverse the list. 3989 unsigned NumNegativeBits = 0; 3990 unsigned NumPositiveBits = 0; 3991 3992 // Keep track of whether all elements have type int. 3993 bool AllElementsInt = true; 3994 3995 for (unsigned i = 0; i != NumElements; ++i) { 3996 EnumConstantDecl *ECD = 3997 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 3998 if (!ECD) continue; // Already issued a diagnostic. 3999 4000 // If the enum value doesn't fit in an int, emit an extension warning. 4001 const llvm::APSInt &InitVal = ECD->getInitVal(); 4002 assert(InitVal.getBitWidth() >= IntWidth && 4003 "Should have promoted value to int"); 4004 if (InitVal.getBitWidth() > IntWidth) { 4005 llvm::APSInt V(InitVal); 4006 V.trunc(IntWidth); 4007 V.extend(InitVal.getBitWidth()); 4008 if (V != InitVal) 4009 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 4010 << InitVal.toString(10); 4011 } 4012 4013 // Keep track of the size of positive and negative values. 4014 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 4015 NumPositiveBits = std::max(NumPositiveBits, 4016 (unsigned)InitVal.getActiveBits()); 4017 else 4018 NumNegativeBits = std::max(NumNegativeBits, 4019 (unsigned)InitVal.getMinSignedBits()); 4020 4021 // Keep track of whether every enum element has type int (very commmon). 4022 if (AllElementsInt) 4023 AllElementsInt = ECD->getType() == Context.IntTy; 4024 } 4025 4026 // Figure out the type that should be used for this enum. 4027 // FIXME: Support attribute(packed) on enums and -fshort-enums. 4028 QualType BestType; 4029 unsigned BestWidth; 4030 4031 if (NumNegativeBits) { 4032 // If there is a negative value, figure out the smallest integer type (of 4033 // int/long/longlong) that fits. 4034 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 4035 BestType = Context.IntTy; 4036 BestWidth = IntWidth; 4037 } else { 4038 BestWidth = Context.Target.getLongWidth(); 4039 4040 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 4041 BestType = Context.LongTy; 4042 else { 4043 BestWidth = Context.Target.getLongLongWidth(); 4044 4045 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 4046 Diag(Enum->getLocation(), diag::warn_enum_too_large); 4047 BestType = Context.LongLongTy; 4048 } 4049 } 4050 } else { 4051 // If there is no negative value, figure out which of uint, ulong, ulonglong 4052 // fits. 4053 if (NumPositiveBits <= IntWidth) { 4054 BestType = Context.UnsignedIntTy; 4055 BestWidth = IntWidth; 4056 } else if (NumPositiveBits <= 4057 (BestWidth = Context.Target.getLongWidth())) { 4058 BestType = Context.UnsignedLongTy; 4059 } else { 4060 BestWidth = Context.Target.getLongLongWidth(); 4061 assert(NumPositiveBits <= BestWidth && 4062 "How could an initializer get larger than ULL?"); 4063 BestType = Context.UnsignedLongLongTy; 4064 } 4065 } 4066 4067 // Loop over all of the enumerator constants, changing their types to match 4068 // the type of the enum if needed. 4069 for (unsigned i = 0; i != NumElements; ++i) { 4070 EnumConstantDecl *ECD = 4071 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 4072 if (!ECD) continue; // Already issued a diagnostic. 4073 4074 // Standard C says the enumerators have int type, but we allow, as an 4075 // extension, the enumerators to be larger than int size. If each 4076 // enumerator value fits in an int, type it as an int, otherwise type it the 4077 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 4078 // that X has type 'int', not 'unsigned'. 4079 if (ECD->getType() == Context.IntTy) { 4080 // Make sure the init value is signed. 4081 llvm::APSInt IV = ECD->getInitVal(); 4082 IV.setIsSigned(true); 4083 ECD->setInitVal(IV); 4084 4085 if (getLangOptions().CPlusPlus) 4086 // C++ [dcl.enum]p4: Following the closing brace of an 4087 // enum-specifier, each enumerator has the type of its 4088 // enumeration. 4089 ECD->setType(EnumType); 4090 continue; // Already int type. 4091 } 4092 4093 // Determine whether the value fits into an int. 4094 llvm::APSInt InitVal = ECD->getInitVal(); 4095 bool FitsInInt; 4096 if (InitVal.isUnsigned() || !InitVal.isNegative()) 4097 FitsInInt = InitVal.getActiveBits() < IntWidth; 4098 else 4099 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 4100 4101 // If it fits into an integer type, force it. Otherwise force it to match 4102 // the enum decl type. 4103 QualType NewTy; 4104 unsigned NewWidth; 4105 bool NewSign; 4106 if (FitsInInt) { 4107 NewTy = Context.IntTy; 4108 NewWidth = IntWidth; 4109 NewSign = true; 4110 } else if (ECD->getType() == BestType) { 4111 // Already the right type! 4112 if (getLangOptions().CPlusPlus) 4113 // C++ [dcl.enum]p4: Following the closing brace of an 4114 // enum-specifier, each enumerator has the type of its 4115 // enumeration. 4116 ECD->setType(EnumType); 4117 continue; 4118 } else { 4119 NewTy = BestType; 4120 NewWidth = BestWidth; 4121 NewSign = BestType->isSignedIntegerType(); 4122 } 4123 4124 // Adjust the APSInt value. 4125 InitVal.extOrTrunc(NewWidth); 4126 InitVal.setIsSigned(NewSign); 4127 ECD->setInitVal(InitVal); 4128 4129 // Adjust the Expr initializer and type. 4130 if (ECD->getInitExpr()) 4131 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), 4132 /*isLvalue=*/false)); 4133 if (getLangOptions().CPlusPlus) 4134 // C++ [dcl.enum]p4: Following the closing brace of an 4135 // enum-specifier, each enumerator has the type of its 4136 // enumeration. 4137 ECD->setType(EnumType); 4138 else 4139 ECD->setType(NewTy); 4140 } 4141 4142 Enum->completeDefinition(Context, BestType); 4143} 4144 4145Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 4146 ExprArg expr) { 4147 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr.release()); 4148 4149 return DeclPtrTy::make(FileScopeAsmDecl::Create(Context, CurContext, 4150 Loc, AsmString)); 4151} 4152 4153