SemaDecl.cpp revision eaab20669b6a9910a5deb0110fdd8f7581d86a36
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(DeclTy *d) { 36 Decl *D = static_cast<Decl *>(d); 37 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 38 return DN->getQualifiedNameAsString(); 39 return ""; 40} 41 42/// \brief If the identifier refers to a type name within this scope, 43/// return the declaration of that type. 44/// 45/// This routine performs ordinary name lookup of the identifier II 46/// within the given scope, with optional C++ scope specifier SS, to 47/// determine whether the name refers to a type. If so, returns an 48/// opaque pointer (actually a QualType) corresponding to that 49/// type. Otherwise, returns NULL. 50/// 51/// If name lookup results in an ambiguity, this routine will complain 52/// and then return NULL. 53Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 54 Scope *S, const CXXScopeSpec *SS) { 55 NamedDecl *IIDecl = 0; 56 LookupResult Result = LookupParsedName(S, SS, &II, LookupOrdinaryName, 57 false, false); 58 switch (Result.getKind()) { 59 case LookupResult::NotFound: 60 case LookupResult::FoundOverloaded: 61 return 0; 62 63 case LookupResult::AmbiguousBaseSubobjectTypes: 64 case LookupResult::AmbiguousBaseSubobjects: 65 case LookupResult::AmbiguousReference: 66 DiagnoseAmbiguousLookup(Result, DeclarationName(&II), NameLoc); 67 return 0; 68 69 case LookupResult::Found: 70 IIDecl = Result.getAsDecl(); 71 break; 72 } 73 74 if (IIDecl) { 75 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 76 // Check whether we can use this type 77 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 78 79 return Context.getTypeDeclType(TD).getAsOpaquePtr(); 80 } 81 82 if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 83 // Check whether we can use this interface. 84 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 85 86 return Context.getObjCInterfaceType(IDecl).getAsOpaquePtr(); 87 } 88 89 // Otherwise, could be a variable, function etc. 90 } 91 return 0; 92} 93 94DeclContext *Sema::getContainingDC(DeclContext *DC) { 95 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) { 96 // A C++ out-of-line method will return to the file declaration context. 97 if (MD->isOutOfLineDefinition()) 98 return MD->getLexicalDeclContext(); 99 100 // A C++ inline method is parsed *after* the topmost class it was declared 101 // in is fully parsed (it's "complete"). 102 // The parsing of a C++ inline method happens at the declaration context of 103 // the topmost (non-nested) class it is lexically declared in. 104 assert(isa<CXXRecordDecl>(MD->getParent()) && "C++ method not in Record."); 105 DC = MD->getParent(); 106 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 107 DC = RD; 108 109 // Return the declaration context of the topmost class the inline method is 110 // declared in. 111 return DC; 112 } 113 114 if (isa<ObjCMethodDecl>(DC)) 115 return Context.getTranslationUnitDecl(); 116 117 return DC->getLexicalParent(); 118} 119 120void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 121 assert(getContainingDC(DC) == CurContext && 122 "The next DeclContext should be lexically contained in the current one."); 123 CurContext = DC; 124 S->setEntity(DC); 125} 126 127void Sema::PopDeclContext() { 128 assert(CurContext && "DeclContext imbalance!"); 129 130 CurContext = getContainingDC(CurContext); 131} 132 133/// \brief Determine whether we allow overloading of the function 134/// PrevDecl with another declaration. 135/// 136/// This routine determines whether overloading is possible, not 137/// whether some new function is actually an overload. It will return 138/// true in C++ (where we can always provide overloads) or, as an 139/// extension, in C when the previous function is already an 140/// overloaded function declaration or has the "overloadable" 141/// attribute. 142static bool AllowOverloadingOfFunction(Decl *PrevDecl, ASTContext &Context) { 143 if (Context.getLangOptions().CPlusPlus) 144 return true; 145 146 if (isa<OverloadedFunctionDecl>(PrevDecl)) 147 return true; 148 149 return PrevDecl->getAttr<OverloadableAttr>() != 0; 150} 151 152/// Add this decl to the scope shadowed decl chains. 153void Sema::PushOnScopeChains(NamedDecl *D, Scope *S) { 154 // Move up the scope chain until we find the nearest enclosing 155 // non-transparent context. The declaration will be introduced into this 156 // scope. 157 while (S->getEntity() && 158 ((DeclContext *)S->getEntity())->isTransparentContext()) 159 S = S->getParent(); 160 161 S->AddDecl(D); 162 163 // Add scoped declarations into their context, so that they can be 164 // found later. Declarations without a context won't be inserted 165 // into any context. 166 CurContext->addDecl(D); 167 168 // C++ [basic.scope]p4: 169 // -- exactly one declaration shall declare a class name or 170 // enumeration name that is not a typedef name and the other 171 // declarations shall all refer to the same object or 172 // enumerator, or all refer to functions and function templates; 173 // in this case the class name or enumeration name is hidden. 174 if (TagDecl *TD = dyn_cast<TagDecl>(D)) { 175 // We are pushing the name of a tag (enum or class). 176 if (CurContext->getLookupContext() 177 == TD->getDeclContext()->getLookupContext()) { 178 // We're pushing the tag into the current context, which might 179 // require some reshuffling in the identifier resolver. 180 IdentifierResolver::iterator 181 I = IdResolver.begin(TD->getDeclName()), 182 IEnd = IdResolver.end(); 183 if (I != IEnd && isDeclInScope(*I, CurContext, S)) { 184 NamedDecl *PrevDecl = *I; 185 for (; I != IEnd && isDeclInScope(*I, CurContext, S); 186 PrevDecl = *I, ++I) { 187 if (TD->declarationReplaces(*I)) { 188 // This is a redeclaration. Remove it from the chain and 189 // break out, so that we'll add in the shadowed 190 // declaration. 191 S->RemoveDecl(*I); 192 if (PrevDecl == *I) { 193 IdResolver.RemoveDecl(*I); 194 IdResolver.AddDecl(TD); 195 return; 196 } else { 197 IdResolver.RemoveDecl(*I); 198 break; 199 } 200 } 201 } 202 203 // There is already a declaration with the same name in the same 204 // scope, which is not a tag declaration. It must be found 205 // before we find the new declaration, so insert the new 206 // declaration at the end of the chain. 207 IdResolver.AddShadowedDecl(TD, PrevDecl); 208 209 return; 210 } 211 } 212 } else if (isa<FunctionDecl>(D) && 213 AllowOverloadingOfFunction(D, Context)) { 214 // We are pushing the name of a function, which might be an 215 // overloaded name. 216 FunctionDecl *FD = cast<FunctionDecl>(D); 217 IdentifierResolver::iterator Redecl 218 = std::find_if(IdResolver.begin(FD->getDeclName()), 219 IdResolver.end(), 220 std::bind1st(std::mem_fun(&NamedDecl::declarationReplaces), 221 FD)); 222 if (Redecl != IdResolver.end() && S->isDeclScope(*Redecl)) { 223 // There is already a declaration of a function on our 224 // IdResolver chain. Replace it with this declaration. 225 S->RemoveDecl(*Redecl); 226 IdResolver.RemoveDecl(*Redecl); 227 } 228 } 229 230 IdResolver.AddDecl(D); 231} 232 233void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 234 if (S->decl_empty()) return; 235 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 236 "Scope shouldn't contain decls!"); 237 238 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 239 I != E; ++I) { 240 Decl *TmpD = static_cast<Decl*>(*I); 241 assert(TmpD && "This decl didn't get pushed??"); 242 243 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 244 NamedDecl *D = cast<NamedDecl>(TmpD); 245 246 if (!D->getDeclName()) continue; 247 248 // Remove this name from our lexical scope. 249 IdResolver.RemoveDecl(D); 250 } 251} 252 253/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 254/// return 0 if one not found. 255ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 256 // The third "scope" argument is 0 since we aren't enabling lazy built-in 257 // creation from this context. 258 NamedDecl *IDecl = LookupName(TUScope, Id, LookupOrdinaryName); 259 260 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 261} 262 263/// getNonFieldDeclScope - Retrieves the innermost scope, starting 264/// from S, where a non-field would be declared. This routine copes 265/// with the difference between C and C++ scoping rules in structs and 266/// unions. For example, the following code is well-formed in C but 267/// ill-formed in C++: 268/// @code 269/// struct S6 { 270/// enum { BAR } e; 271/// }; 272/// 273/// void test_S6() { 274/// struct S6 a; 275/// a.e = BAR; 276/// } 277/// @endcode 278/// For the declaration of BAR, this routine will return a different 279/// scope. The scope S will be the scope of the unnamed enumeration 280/// within S6. In C++, this routine will return the scope associated 281/// with S6, because the enumeration's scope is a transparent 282/// context but structures can contain non-field names. In C, this 283/// routine will return the translation unit scope, since the 284/// enumeration's scope is a transparent context and structures cannot 285/// contain non-field names. 286Scope *Sema::getNonFieldDeclScope(Scope *S) { 287 while (((S->getFlags() & Scope::DeclScope) == 0) || 288 (S->getEntity() && 289 ((DeclContext *)S->getEntity())->isTransparentContext()) || 290 (S->isClassScope() && !getLangOptions().CPlusPlus)) 291 S = S->getParent(); 292 return S; 293} 294 295void Sema::InitBuiltinVaListType() { 296 if (!Context.getBuiltinVaListType().isNull()) 297 return; 298 299 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 300 NamedDecl *VaDecl = LookupName(TUScope, VaIdent, LookupOrdinaryName); 301 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 302 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 303} 304 305/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 306/// file scope. lazily create a decl for it. ForRedeclaration is true 307/// if we're creating this built-in in anticipation of redeclaring the 308/// built-in. 309NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 310 Scope *S, bool ForRedeclaration, 311 SourceLocation Loc) { 312 Builtin::ID BID = (Builtin::ID)bid; 313 314 if (Context.BuiltinInfo.hasVAListUse(BID)) 315 InitBuiltinVaListType(); 316 317 Builtin::Context::GetBuiltinTypeError Error; 318 QualType R = Context.BuiltinInfo.GetBuiltinType(BID, Context, Error); 319 switch (Error) { 320 case Builtin::Context::GE_None: 321 // Okay 322 break; 323 324 case Builtin::Context::GE_Missing_FILE: 325 if (ForRedeclaration) 326 Diag(Loc, diag::err_implicit_decl_requires_stdio) 327 << Context.BuiltinInfo.GetName(BID); 328 return 0; 329 } 330 331 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 332 Diag(Loc, diag::ext_implicit_lib_function_decl) 333 << Context.BuiltinInfo.GetName(BID) 334 << R; 335 if (Context.BuiltinInfo.getHeaderName(BID) && 336 Diags.getDiagnosticMapping(diag::ext_implicit_lib_function_decl) 337 != diag::MAP_IGNORE) 338 Diag(Loc, diag::note_please_include_header) 339 << Context.BuiltinInfo.getHeaderName(BID) 340 << Context.BuiltinInfo.GetName(BID); 341 } 342 343 FunctionDecl *New = FunctionDecl::Create(Context, 344 Context.getTranslationUnitDecl(), 345 Loc, II, R, 346 FunctionDecl::Extern, false, 347 /*hasPrototype=*/true); 348 New->setImplicit(); 349 350 // Create Decl objects for each parameter, adding them to the 351 // FunctionDecl. 352 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 353 llvm::SmallVector<ParmVarDecl*, 16> Params; 354 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 355 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 356 FT->getArgType(i), VarDecl::None, 0)); 357 New->setParams(Context, &Params[0], Params.size()); 358 } 359 360 AddKnownFunctionAttributes(New); 361 362 // TUScope is the translation-unit scope to insert this function into. 363 // FIXME: This is hideous. We need to teach PushOnScopeChains to 364 // relate Scopes to DeclContexts, and probably eliminate CurContext 365 // entirely, but we're not there yet. 366 DeclContext *SavedContext = CurContext; 367 CurContext = Context.getTranslationUnitDecl(); 368 PushOnScopeChains(New, TUScope); 369 CurContext = SavedContext; 370 return New; 371} 372 373/// GetStdNamespace - This method gets the C++ "std" namespace. This is where 374/// everything from the standard library is defined. 375NamespaceDecl *Sema::GetStdNamespace() { 376 if (!StdNamespace) { 377 IdentifierInfo *StdIdent = &PP.getIdentifierTable().get("std"); 378 DeclContext *Global = Context.getTranslationUnitDecl(); 379 Decl *Std = LookupQualifiedName(Global, StdIdent, LookupNamespaceName); 380 StdNamespace = dyn_cast_or_null<NamespaceDecl>(Std); 381 } 382 return StdNamespace; 383} 384 385/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 386/// same name and scope as a previous declaration 'Old'. Figure out 387/// how to resolve this situation, merging decls or emitting 388/// diagnostics as appropriate. Returns true if there was an error, 389/// false otherwise. 390/// 391bool Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 392 bool objc_types = false; 393 // Allow multiple definitions for ObjC built-in typedefs. 394 // FIXME: Verify the underlying types are equivalent! 395 if (getLangOptions().ObjC1) { 396 const IdentifierInfo *TypeID = New->getIdentifier(); 397 switch (TypeID->getLength()) { 398 default: break; 399 case 2: 400 if (!TypeID->isStr("id")) 401 break; 402 Context.setObjCIdType(New); 403 objc_types = true; 404 break; 405 case 5: 406 if (!TypeID->isStr("Class")) 407 break; 408 Context.setObjCClassType(New); 409 objc_types = true; 410 return false; 411 case 3: 412 if (!TypeID->isStr("SEL")) 413 break; 414 Context.setObjCSelType(New); 415 objc_types = true; 416 return false; 417 case 8: 418 if (!TypeID->isStr("Protocol")) 419 break; 420 Context.setObjCProtoType(New->getUnderlyingType()); 421 objc_types = true; 422 return false; 423 } 424 // Fall through - the typedef name was not a builtin type. 425 } 426 // Verify the old decl was also a type. 427 TypeDecl *Old = dyn_cast<TypeDecl>(OldD); 428 if (!Old) { 429 Diag(New->getLocation(), diag::err_redefinition_different_kind) 430 << New->getDeclName(); 431 if (!objc_types) 432 Diag(OldD->getLocation(), diag::note_previous_definition); 433 return true; 434 } 435 436 // Determine the "old" type we'll use for checking and diagnostics. 437 QualType OldType; 438 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 439 OldType = OldTypedef->getUnderlyingType(); 440 else 441 OldType = Context.getTypeDeclType(Old); 442 443 // If the typedef types are not identical, reject them in all languages and 444 // with any extensions enabled. 445 446 if (OldType != New->getUnderlyingType() && 447 Context.getCanonicalType(OldType) != 448 Context.getCanonicalType(New->getUnderlyingType())) { 449 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 450 << New->getUnderlyingType() << OldType; 451 if (!objc_types) 452 Diag(Old->getLocation(), diag::note_previous_definition); 453 return true; 454 } 455 if (objc_types) return false; 456 if (getLangOptions().Microsoft) return false; 457 458 // C++ [dcl.typedef]p2: 459 // In a given non-class scope, a typedef specifier can be used to 460 // redefine the name of any type declared in that scope to refer 461 // to the type to which it already refers. 462 if (getLangOptions().CPlusPlus && !isa<CXXRecordDecl>(CurContext)) 463 return false; 464 465 // In C, redeclaration of a type is a constraint violation (6.7.2.3p1). 466 // Apparently GCC, Intel, and Sun all silently ignore the redeclaration if 467 // *either* declaration is in a system header. The code below implements 468 // this adhoc compatibility rule. FIXME: The following code will not 469 // work properly when compiling ".i" files (containing preprocessed output). 470 if (PP.getDiagnostics().getSuppressSystemWarnings()) { 471 SourceManager &SrcMgr = Context.getSourceManager(); 472 if (SrcMgr.isInSystemHeader(Old->getLocation())) 473 return false; 474 if (SrcMgr.isInSystemHeader(New->getLocation())) 475 return false; 476 } 477 478 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 479 Diag(Old->getLocation(), diag::note_previous_definition); 480 return true; 481} 482 483/// DeclhasAttr - returns true if decl Declaration already has the target 484/// attribute. 485static bool DeclHasAttr(const Decl *decl, const Attr *target) { 486 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 487 if (attr->getKind() == target->getKind()) 488 return true; 489 490 return false; 491} 492 493/// MergeAttributes - append attributes from the Old decl to the New one. 494static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 495 Attr *attr = const_cast<Attr*>(Old->getAttrs()); 496 497 while (attr) { 498 Attr *tmp = attr; 499 attr = attr->getNext(); 500 501 if (!DeclHasAttr(New, tmp) && tmp->isMerged()) { 502 tmp->setInherited(true); 503 New->addAttr(tmp); 504 } else { 505 tmp->setNext(0); 506 tmp->Destroy(C); 507 } 508 } 509 510 Old->invalidateAttrs(); 511} 512 513/// Used in MergeFunctionDecl to keep track of function parameters in 514/// C. 515struct GNUCompatibleParamWarning { 516 ParmVarDecl *OldParm; 517 ParmVarDecl *NewParm; 518 QualType PromotedType; 519}; 520 521/// MergeFunctionDecl - We just parsed a function 'New' from 522/// declarator D which has the same name and scope as a previous 523/// declaration 'Old'. Figure out how to resolve this situation, 524/// merging decls or emitting diagnostics as appropriate. 525/// 526/// In C++, New and Old must be declarations that are not 527/// overloaded. Use IsOverload to determine whether New and Old are 528/// overloaded, and to select the Old declaration that New should be 529/// merged with. 530/// 531/// Returns true if there was an error, false otherwise. 532bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 533 assert(!isa<OverloadedFunctionDecl>(OldD) && 534 "Cannot merge with an overloaded function declaration"); 535 536 // Verify the old decl was also a function. 537 FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); 538 if (!Old) { 539 Diag(New->getLocation(), diag::err_redefinition_different_kind) 540 << New->getDeclName(); 541 Diag(OldD->getLocation(), diag::note_previous_definition); 542 return true; 543 } 544 545 // Determine whether the previous declaration was a definition, 546 // implicit declaration, or a declaration. 547 diag::kind PrevDiag; 548 if (Old->isThisDeclarationADefinition()) 549 PrevDiag = diag::note_previous_definition; 550 else if (Old->isImplicit()) 551 PrevDiag = diag::note_previous_implicit_declaration; 552 else 553 PrevDiag = diag::note_previous_declaration; 554 555 QualType OldQType = Context.getCanonicalType(Old->getType()); 556 QualType NewQType = Context.getCanonicalType(New->getType()); 557 558 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 559 New->getStorageClass() == FunctionDecl::Static && 560 Old->getStorageClass() != FunctionDecl::Static) { 561 Diag(New->getLocation(), diag::err_static_non_static) 562 << New; 563 Diag(Old->getLocation(), PrevDiag); 564 return true; 565 } 566 567 if (getLangOptions().CPlusPlus) { 568 // (C++98 13.1p2): 569 // Certain function declarations cannot be overloaded: 570 // -- Function declarations that differ only in the return type 571 // cannot be overloaded. 572 QualType OldReturnType 573 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 574 QualType NewReturnType 575 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 576 if (OldReturnType != NewReturnType) { 577 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 578 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 579 return true; 580 } 581 582 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 583 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 584 if (OldMethod && NewMethod && 585 OldMethod->getLexicalDeclContext() == 586 NewMethod->getLexicalDeclContext()) { 587 // -- Member function declarations with the same name and the 588 // same parameter types cannot be overloaded if any of them 589 // is a static member function declaration. 590 if (OldMethod->isStatic() || NewMethod->isStatic()) { 591 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 592 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 593 return true; 594 } 595 596 // C++ [class.mem]p1: 597 // [...] A member shall not be declared twice in the 598 // member-specification, except that a nested class or member 599 // class template can be declared and then later defined. 600 unsigned NewDiag; 601 if (isa<CXXConstructorDecl>(OldMethod)) 602 NewDiag = diag::err_constructor_redeclared; 603 else if (isa<CXXDestructorDecl>(NewMethod)) 604 NewDiag = diag::err_destructor_redeclared; 605 else if (isa<CXXConversionDecl>(NewMethod)) 606 NewDiag = diag::err_conv_function_redeclared; 607 else 608 NewDiag = diag::err_member_redeclared; 609 610 Diag(New->getLocation(), NewDiag); 611 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 612 } 613 614 // (C++98 8.3.5p3): 615 // All declarations for a function shall agree exactly in both the 616 // return type and the parameter-type-list. 617 if (OldQType == NewQType) 618 return MergeCompatibleFunctionDecls(New, Old); 619 620 // Fall through for conflicting redeclarations and redefinitions. 621 } 622 623 // C: Function types need to be compatible, not identical. This handles 624 // duplicate function decls like "void f(int); void f(enum X);" properly. 625 if (!getLangOptions().CPlusPlus && 626 Context.typesAreCompatible(OldQType, NewQType)) { 627 const FunctionType *OldFuncType = OldQType->getAsFunctionType(); 628 const FunctionType *NewFuncType = NewQType->getAsFunctionType(); 629 const FunctionProtoType *OldProto = 0; 630 if (isa<FunctionNoProtoType>(NewFuncType) && 631 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 632 // The old declaration provided a function prototype, but the 633 // new declaration does not. Merge in the prototype. 634 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 635 OldProto->arg_type_end()); 636 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 637 &ParamTypes[0], ParamTypes.size(), 638 OldProto->isVariadic(), 639 OldProto->getTypeQuals()); 640 New->setType(NewQType); 641 New->setInheritedPrototype(); 642 643 // Synthesize a parameter for each argument type. 644 llvm::SmallVector<ParmVarDecl*, 16> Params; 645 for (FunctionProtoType::arg_type_iterator 646 ParamType = OldProto->arg_type_begin(), 647 ParamEnd = OldProto->arg_type_end(); 648 ParamType != ParamEnd; ++ParamType) { 649 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 650 SourceLocation(), 0, 651 *ParamType, VarDecl::None, 652 0); 653 Param->setImplicit(); 654 Params.push_back(Param); 655 } 656 657 New->setParams(Context, &Params[0], Params.size()); 658 } 659 660 return MergeCompatibleFunctionDecls(New, Old); 661 } 662 663 // GNU C permits a K&R definition to follow a prototype declaration 664 // if the declared types of the parameters in the K&R definition 665 // match the types in the prototype declaration, even when the 666 // promoted types of the parameters from the K&R definition differ 667 // from the types in the prototype. GCC then keeps the types from 668 // the prototype. 669 if (!getLangOptions().CPlusPlus && 670 !getLangOptions().NoExtensions && 671 Old->hasPrototype() && !New->hasPrototype() && 672 New->getType()->getAsFunctionProtoType() && 673 Old->getNumParams() == New->getNumParams()) { 674 llvm::SmallVector<QualType, 16> ArgTypes; 675 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 676 const FunctionProtoType *OldProto 677 = Old->getType()->getAsFunctionProtoType(); 678 const FunctionProtoType *NewProto 679 = New->getType()->getAsFunctionProtoType(); 680 681 // Determine whether this is the GNU C extension. 682 bool GNUCompatible = 683 Context.typesAreCompatible(OldProto->getResultType(), 684 NewProto->getResultType()) && 685 (OldProto->isVariadic() == NewProto->isVariadic()); 686 for (unsigned Idx = 0, End = Old->getNumParams(); 687 GNUCompatible && Idx != End; ++Idx) { 688 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 689 ParmVarDecl *NewParm = New->getParamDecl(Idx); 690 if (Context.typesAreCompatible(OldParm->getType(), 691 NewProto->getArgType(Idx))) { 692 ArgTypes.push_back(NewParm->getType()); 693 } else if (Context.typesAreCompatible(OldParm->getType(), 694 NewParm->getType())) { 695 GNUCompatibleParamWarning Warn 696 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 697 Warnings.push_back(Warn); 698 ArgTypes.push_back(NewParm->getType()); 699 } else 700 GNUCompatible = false; 701 } 702 703 if (GNUCompatible) { 704 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 705 Diag(Warnings[Warn].NewParm->getLocation(), 706 diag::ext_param_promoted_not_compatible_with_prototype) 707 << Warnings[Warn].PromotedType 708 << Warnings[Warn].OldParm->getType(); 709 Diag(Warnings[Warn].OldParm->getLocation(), 710 diag::note_previous_declaration); 711 } 712 713 New->setType(Context.getFunctionType(NewProto->getResultType(), 714 &ArgTypes[0], ArgTypes.size(), 715 NewProto->isVariadic(), 716 NewProto->getTypeQuals())); 717 return MergeCompatibleFunctionDecls(New, Old); 718 } 719 720 // Fall through to diagnose conflicting types. 721 } 722 723 // A function that has already been declared has been redeclared or defined 724 // with a different type- show appropriate diagnostic 725 if (unsigned BuiltinID = Old->getBuiltinID(Context)) { 726 // The user has declared a builtin function with an incompatible 727 // signature. 728 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 729 // The function the user is redeclaring is a library-defined 730 // function like 'malloc' or 'printf'. Warn about the 731 // redeclaration, then ignore it. 732 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 733 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 734 << Old << Old->getType(); 735 return true; 736 } 737 738 PrevDiag = diag::note_previous_builtin_declaration; 739 } 740 741 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 742 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 743 return true; 744} 745 746/// \brief Completes the merge of two function declarations that are 747/// known to be compatible. 748/// 749/// This routine handles the merging of attributes and other 750/// properties of function declarations form the old declaration to 751/// the new declaration, once we know that New is in fact a 752/// redeclaration of Old. 753/// 754/// \returns false 755bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 756 // Merge the attributes 757 MergeAttributes(New, Old, Context); 758 759 // Merge the storage class. 760 New->setStorageClass(Old->getStorageClass()); 761 762 // FIXME: need to implement inline semantics 763 764 // Merge "pure" flag. 765 if (Old->isPure()) 766 New->setPure(); 767 768 // Merge the "deleted" flag. 769 if (Old->isDeleted()) 770 New->setDeleted(); 771 772 if (getLangOptions().CPlusPlus) 773 return MergeCXXFunctionDecl(New, Old); 774 775 return false; 776} 777 778/// MergeVarDecl - We just parsed a variable 'New' which has the same name 779/// and scope as a previous declaration 'Old'. Figure out how to resolve this 780/// situation, merging decls or emitting diagnostics as appropriate. 781/// 782/// Tentative definition rules (C99 6.9.2p2) are checked by 783/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 784/// definitions here, since the initializer hasn't been attached. 785/// 786bool Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 787 // Verify the old decl was also a variable. 788 VarDecl *Old = dyn_cast<VarDecl>(OldD); 789 if (!Old) { 790 Diag(New->getLocation(), diag::err_redefinition_different_kind) 791 << New->getDeclName(); 792 Diag(OldD->getLocation(), diag::note_previous_definition); 793 return true; 794 } 795 796 MergeAttributes(New, Old, Context); 797 798 // Merge the types 799 QualType MergedT = Context.mergeTypes(New->getType(), Old->getType()); 800 if (MergedT.isNull()) { 801 Diag(New->getLocation(), diag::err_redefinition_different_type) 802 << New->getDeclName(); 803 Diag(Old->getLocation(), diag::note_previous_definition); 804 return true; 805 } 806 New->setType(MergedT); 807 808 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 809 if (New->getStorageClass() == VarDecl::Static && 810 (Old->getStorageClass() == VarDecl::None || 811 Old->getStorageClass() == VarDecl::Extern)) { 812 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 813 Diag(Old->getLocation(), diag::note_previous_definition); 814 return true; 815 } 816 // C99 6.2.2p4: Check if we have a non-static decl followed by a static. 817 if (New->getStorageClass() != VarDecl::Static && 818 Old->getStorageClass() == VarDecl::Static) { 819 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 820 Diag(Old->getLocation(), diag::note_previous_definition); 821 return true; 822 } 823 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 824 if (New->getStorageClass() != VarDecl::Extern && !New->isFileVarDecl() && 825 // Don't complain about out-of-line definitions of static members. 826 !(Old->getLexicalDeclContext()->isRecord() && 827 !New->getLexicalDeclContext()->isRecord())) { 828 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 829 Diag(Old->getLocation(), diag::note_previous_definition); 830 return true; 831 } 832 833 // Keep a chain of previous declarations. 834 New->setPreviousDeclaration(Old); 835 836 return false; 837} 838 839/// CheckParmsForFunctionDef - Check that the parameters of the given 840/// function are appropriate for the definition of a function. This 841/// takes care of any checks that cannot be performed on the 842/// declaration itself, e.g., that the types of each of the function 843/// parameters are complete. 844bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 845 bool HasInvalidParm = false; 846 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 847 ParmVarDecl *Param = FD->getParamDecl(p); 848 849 // C99 6.7.5.3p4: the parameters in a parameter type list in a 850 // function declarator that is part of a function definition of 851 // that function shall not have incomplete type. 852 if (!Param->isInvalidDecl() && 853 RequireCompleteType(Param->getLocation(), Param->getType(), 854 diag::err_typecheck_decl_incomplete_type)) { 855 Param->setInvalidDecl(); 856 HasInvalidParm = true; 857 } 858 859 // C99 6.9.1p5: If the declarator includes a parameter type list, the 860 // declaration of each parameter shall include an identifier. 861 if (Param->getIdentifier() == 0 && 862 !Param->isImplicit() && 863 !getLangOptions().CPlusPlus) 864 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 865 } 866 867 return HasInvalidParm; 868} 869 870/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 871/// no declarator (e.g. "struct foo;") is parsed. 872Sema::DeclTy *Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 873 TagDecl *Tag = 0; 874 if (DS.getTypeSpecType() == DeclSpec::TST_class || 875 DS.getTypeSpecType() == DeclSpec::TST_struct || 876 DS.getTypeSpecType() == DeclSpec::TST_union || 877 DS.getTypeSpecType() == DeclSpec::TST_enum) 878 Tag = dyn_cast<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 879 880 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 881 if (!Record->getDeclName() && Record->isDefinition() && 882 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 883 if (getLangOptions().CPlusPlus || 884 Record->getDeclContext()->isRecord()) 885 return BuildAnonymousStructOrUnion(S, DS, Record); 886 887 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 888 << DS.getSourceRange(); 889 } 890 891 // Microsoft allows unnamed struct/union fields. Don't complain 892 // about them. 893 // FIXME: Should we support Microsoft's extensions in this area? 894 if (Record->getDeclName() && getLangOptions().Microsoft) 895 return Tag; 896 } 897 898 if (!DS.isMissingDeclaratorOk() && 899 DS.getTypeSpecType() != DeclSpec::TST_error) { 900 // Warn about typedefs of enums without names, since this is an 901 // extension in both Microsoft an GNU. 902 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 903 Tag && isa<EnumDecl>(Tag)) { 904 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 905 << DS.getSourceRange(); 906 return Tag; 907 } 908 909 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 910 << DS.getSourceRange(); 911 return 0; 912 } 913 914 return Tag; 915} 916 917/// InjectAnonymousStructOrUnionMembers - Inject the members of the 918/// anonymous struct or union AnonRecord into the owning context Owner 919/// and scope S. This routine will be invoked just after we realize 920/// that an unnamed union or struct is actually an anonymous union or 921/// struct, e.g., 922/// 923/// @code 924/// union { 925/// int i; 926/// float f; 927/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 928/// // f into the surrounding scope.x 929/// @endcode 930/// 931/// This routine is recursive, injecting the names of nested anonymous 932/// structs/unions into the owning context and scope as well. 933bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 934 RecordDecl *AnonRecord) { 935 bool Invalid = false; 936 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 937 FEnd = AnonRecord->field_end(); 938 F != FEnd; ++F) { 939 if ((*F)->getDeclName()) { 940 NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 941 LookupOrdinaryName, true); 942 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 943 // C++ [class.union]p2: 944 // The names of the members of an anonymous union shall be 945 // distinct from the names of any other entity in the 946 // scope in which the anonymous union is declared. 947 unsigned diagKind 948 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 949 : diag::err_anonymous_struct_member_redecl; 950 Diag((*F)->getLocation(), diagKind) 951 << (*F)->getDeclName(); 952 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 953 Invalid = true; 954 } else { 955 // C++ [class.union]p2: 956 // For the purpose of name lookup, after the anonymous union 957 // definition, the members of the anonymous union are 958 // considered to have been defined in the scope in which the 959 // anonymous union is declared. 960 Owner->makeDeclVisibleInContext(*F); 961 S->AddDecl(*F); 962 IdResolver.AddDecl(*F); 963 } 964 } else if (const RecordType *InnerRecordType 965 = (*F)->getType()->getAsRecordType()) { 966 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 967 if (InnerRecord->isAnonymousStructOrUnion()) 968 Invalid = Invalid || 969 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 970 } 971 } 972 973 return Invalid; 974} 975 976/// ActOnAnonymousStructOrUnion - Handle the declaration of an 977/// anonymous structure or union. Anonymous unions are a C++ feature 978/// (C++ [class.union]) and a GNU C extension; anonymous structures 979/// are a GNU C and GNU C++ extension. 980Sema::DeclTy *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 981 RecordDecl *Record) { 982 DeclContext *Owner = Record->getDeclContext(); 983 984 // Diagnose whether this anonymous struct/union is an extension. 985 if (Record->isUnion() && !getLangOptions().CPlusPlus) 986 Diag(Record->getLocation(), diag::ext_anonymous_union); 987 else if (!Record->isUnion()) 988 Diag(Record->getLocation(), diag::ext_anonymous_struct); 989 990 // C and C++ require different kinds of checks for anonymous 991 // structs/unions. 992 bool Invalid = false; 993 if (getLangOptions().CPlusPlus) { 994 const char* PrevSpec = 0; 995 // C++ [class.union]p3: 996 // Anonymous unions declared in a named namespace or in the 997 // global namespace shall be declared static. 998 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 999 (isa<TranslationUnitDecl>(Owner) || 1000 (isa<NamespaceDecl>(Owner) && 1001 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1002 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1003 Invalid = true; 1004 1005 // Recover by adding 'static'. 1006 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); 1007 } 1008 // C++ [class.union]p3: 1009 // A storage class is not allowed in a declaration of an 1010 // anonymous union in a class scope. 1011 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1012 isa<RecordDecl>(Owner)) { 1013 Diag(DS.getStorageClassSpecLoc(), 1014 diag::err_anonymous_union_with_storage_spec); 1015 Invalid = true; 1016 1017 // Recover by removing the storage specifier. 1018 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1019 PrevSpec); 1020 } 1021 1022 // C++ [class.union]p2: 1023 // The member-specification of an anonymous union shall only 1024 // define non-static data members. [Note: nested types and 1025 // functions cannot be declared within an anonymous union. ] 1026 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1027 MemEnd = Record->decls_end(); 1028 Mem != MemEnd; ++Mem) { 1029 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1030 // C++ [class.union]p3: 1031 // An anonymous union shall not have private or protected 1032 // members (clause 11). 1033 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1034 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1035 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1036 Invalid = true; 1037 } 1038 } else if ((*Mem)->isImplicit()) { 1039 // Any implicit members are fine. 1040 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1041 // This is a type that showed up in an 1042 // elaborated-type-specifier inside the anonymous struct or 1043 // union, but which actually declares a type outside of the 1044 // anonymous struct or union. It's okay. 1045 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1046 if (!MemRecord->isAnonymousStructOrUnion() && 1047 MemRecord->getDeclName()) { 1048 // This is a nested type declaration. 1049 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1050 << (int)Record->isUnion(); 1051 Invalid = true; 1052 } 1053 } else { 1054 // We have something that isn't a non-static data 1055 // member. Complain about it. 1056 unsigned DK = diag::err_anonymous_record_bad_member; 1057 if (isa<TypeDecl>(*Mem)) 1058 DK = diag::err_anonymous_record_with_type; 1059 else if (isa<FunctionDecl>(*Mem)) 1060 DK = diag::err_anonymous_record_with_function; 1061 else if (isa<VarDecl>(*Mem)) 1062 DK = diag::err_anonymous_record_with_static; 1063 Diag((*Mem)->getLocation(), DK) 1064 << (int)Record->isUnion(); 1065 Invalid = true; 1066 } 1067 } 1068 } 1069 1070 if (!Record->isUnion() && !Owner->isRecord()) { 1071 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1072 << (int)getLangOptions().CPlusPlus; 1073 Invalid = true; 1074 } 1075 1076 // Create a declaration for this anonymous struct/union. 1077 NamedDecl *Anon = 0; 1078 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1079 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1080 /*IdentifierInfo=*/0, 1081 Context.getTypeDeclType(Record), 1082 /*BitWidth=*/0, /*Mutable=*/false); 1083 Anon->setAccess(AS_public); 1084 if (getLangOptions().CPlusPlus) 1085 FieldCollector->Add(cast<FieldDecl>(Anon)); 1086 } else { 1087 VarDecl::StorageClass SC; 1088 switch (DS.getStorageClassSpec()) { 1089 default: assert(0 && "Unknown storage class!"); 1090 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1091 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1092 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1093 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1094 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1095 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1096 case DeclSpec::SCS_mutable: 1097 // mutable can only appear on non-static class members, so it's always 1098 // an error here 1099 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1100 Invalid = true; 1101 SC = VarDecl::None; 1102 break; 1103 } 1104 1105 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1106 /*IdentifierInfo=*/0, 1107 Context.getTypeDeclType(Record), 1108 SC, DS.getSourceRange().getBegin()); 1109 } 1110 Anon->setImplicit(); 1111 1112 // Add the anonymous struct/union object to the current 1113 // context. We'll be referencing this object when we refer to one of 1114 // its members. 1115 Owner->addDecl(Anon); 1116 1117 // Inject the members of the anonymous struct/union into the owning 1118 // context and into the identifier resolver chain for name lookup 1119 // purposes. 1120 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1121 Invalid = true; 1122 1123 // Mark this as an anonymous struct/union type. Note that we do not 1124 // do this until after we have already checked and injected the 1125 // members of this anonymous struct/union type, because otherwise 1126 // the members could be injected twice: once by DeclContext when it 1127 // builds its lookup table, and once by 1128 // InjectAnonymousStructOrUnionMembers. 1129 Record->setAnonymousStructOrUnion(true); 1130 1131 if (Invalid) 1132 Anon->setInvalidDecl(); 1133 1134 return Anon; 1135} 1136 1137 1138/// GetNameForDeclarator - Determine the full declaration name for the 1139/// given Declarator. 1140DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1141 switch (D.getKind()) { 1142 case Declarator::DK_Abstract: 1143 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 1144 return DeclarationName(); 1145 1146 case Declarator::DK_Normal: 1147 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 1148 return DeclarationName(D.getIdentifier()); 1149 1150 case Declarator::DK_Constructor: { 1151 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1152 Ty = Context.getCanonicalType(Ty); 1153 return Context.DeclarationNames.getCXXConstructorName(Ty); 1154 } 1155 1156 case Declarator::DK_Destructor: { 1157 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1158 Ty = Context.getCanonicalType(Ty); 1159 return Context.DeclarationNames.getCXXDestructorName(Ty); 1160 } 1161 1162 case Declarator::DK_Conversion: { 1163 // FIXME: We'd like to keep the non-canonical type for diagnostics! 1164 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1165 Ty = Context.getCanonicalType(Ty); 1166 return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 1167 } 1168 1169 case Declarator::DK_Operator: 1170 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 1171 return Context.DeclarationNames.getCXXOperatorName( 1172 D.getOverloadedOperator()); 1173 } 1174 1175 assert(false && "Unknown name kind"); 1176 return DeclarationName(); 1177} 1178 1179/// isNearlyMatchingFunction - Determine whether the C++ functions 1180/// Declaration and Definition are "nearly" matching. This heuristic 1181/// is used to improve diagnostics in the case where an out-of-line 1182/// function definition doesn't match any declaration within 1183/// the class or namespace. 1184static bool isNearlyMatchingFunction(ASTContext &Context, 1185 FunctionDecl *Declaration, 1186 FunctionDecl *Definition) { 1187 if (Declaration->param_size() != Definition->param_size()) 1188 return false; 1189 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1190 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1191 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1192 1193 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1194 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 1195 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1196 return false; 1197 } 1198 1199 return true; 1200} 1201 1202Sema::DeclTy * 1203Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl, 1204 bool IsFunctionDefinition) { 1205 NamedDecl *LastDeclarator = dyn_cast_or_null<NamedDecl>((Decl *)lastDecl); 1206 DeclarationName Name = GetNameForDeclarator(D); 1207 1208 // All of these full declarators require an identifier. If it doesn't have 1209 // one, the ParsedFreeStandingDeclSpec action should be used. 1210 if (!Name) { 1211 if (!D.getInvalidType()) // Reject this if we think it is valid. 1212 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1213 diag::err_declarator_need_ident) 1214 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1215 return 0; 1216 } 1217 1218 // The scope passed in may not be a decl scope. Zip up the scope tree until 1219 // we find one that is. 1220 while ((S->getFlags() & Scope::DeclScope) == 0 || 1221 (S->getFlags() & Scope::TemplateParamScope) != 0) 1222 S = S->getParent(); 1223 1224 DeclContext *DC; 1225 NamedDecl *PrevDecl; 1226 NamedDecl *New; 1227 bool InvalidDecl = false; 1228 1229 QualType R = GetTypeForDeclarator(D, S); 1230 if (R.isNull()) { 1231 InvalidDecl = true; 1232 R = Context.IntTy; 1233 } 1234 1235 // See if this is a redefinition of a variable in the same scope. 1236 if (D.getCXXScopeSpec().isInvalid()) { 1237 DC = CurContext; 1238 PrevDecl = 0; 1239 InvalidDecl = true; 1240 } else if (!D.getCXXScopeSpec().isSet()) { 1241 LookupNameKind NameKind = LookupOrdinaryName; 1242 1243 // If the declaration we're planning to build will be a function 1244 // or object with linkage, then look for another declaration with 1245 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1246 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1247 /* Do nothing*/; 1248 else if (R->isFunctionType()) { 1249 if (CurContext->isFunctionOrMethod()) 1250 NameKind = LookupRedeclarationWithLinkage; 1251 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1252 NameKind = LookupRedeclarationWithLinkage; 1253 1254 DC = CurContext; 1255 PrevDecl = LookupName(S, Name, NameKind, true, 1256 D.getDeclSpec().getStorageClassSpec() != 1257 DeclSpec::SCS_static, 1258 D.getIdentifierLoc()); 1259 } else { // Something like "int foo::x;" 1260 DC = static_cast<DeclContext*>(D.getCXXScopeSpec().getScopeRep()); 1261 // FIXME: RequireCompleteDeclContext(D.getCXXScopeSpec()); ? 1262 PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName, true); 1263 1264 // C++ 7.3.1.2p2: 1265 // Members (including explicit specializations of templates) of a named 1266 // namespace can also be defined outside that namespace by explicit 1267 // qualification of the name being defined, provided that the entity being 1268 // defined was already declared in the namespace and the definition appears 1269 // after the point of declaration in a namespace that encloses the 1270 // declarations namespace. 1271 // 1272 // Note that we only check the context at this point. We don't yet 1273 // have enough information to make sure that PrevDecl is actually 1274 // the declaration we want to match. For example, given: 1275 // 1276 // class X { 1277 // void f(); 1278 // void f(float); 1279 // }; 1280 // 1281 // void X::f(int) { } // ill-formed 1282 // 1283 // In this case, PrevDecl will point to the overload set 1284 // containing the two f's declared in X, but neither of them 1285 // matches. 1286 1287 // First check whether we named the global scope. 1288 if (isa<TranslationUnitDecl>(DC)) { 1289 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1290 << Name << D.getCXXScopeSpec().getRange(); 1291 } else if (!CurContext->Encloses(DC)) { 1292 // The qualifying scope doesn't enclose the original declaration. 1293 // Emit diagnostic based on current scope. 1294 SourceLocation L = D.getIdentifierLoc(); 1295 SourceRange R = D.getCXXScopeSpec().getRange(); 1296 if (isa<FunctionDecl>(CurContext)) 1297 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1298 else 1299 Diag(L, diag::err_invalid_declarator_scope) 1300 << Name << cast<NamedDecl>(DC) << R; 1301 InvalidDecl = true; 1302 } 1303 } 1304 1305 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1306 // Maybe we will complain about the shadowed template parameter. 1307 InvalidDecl = InvalidDecl 1308 || DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 1309 // Just pretend that we didn't see the previous declaration. 1310 PrevDecl = 0; 1311 } 1312 1313 // In C++, the previous declaration we find might be a tag type 1314 // (class or enum). In this case, the new declaration will hide the 1315 // tag type. Note that this does does not apply if we're declaring a 1316 // typedef (C++ [dcl.typedef]p4). 1317 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 1318 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1319 PrevDecl = 0; 1320 1321 bool Redeclaration = false; 1322 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1323 New = ActOnTypedefDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1324 InvalidDecl, Redeclaration); 1325 } else if (R->isFunctionType()) { 1326 New = ActOnFunctionDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1327 IsFunctionDefinition, InvalidDecl, 1328 Redeclaration); 1329 } else { 1330 New = ActOnVariableDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1331 InvalidDecl, Redeclaration); 1332 } 1333 1334 if (New == 0) 1335 return 0; 1336 1337 // If this has an identifier and is not an invalid redeclaration, 1338 // add it to the scope stack. 1339 if (Name && !(Redeclaration && InvalidDecl)) 1340 PushOnScopeChains(New, S); 1341 // If any semantic error occurred, mark the decl as invalid. 1342 if (D.getInvalidType() || InvalidDecl) 1343 New->setInvalidDecl(); 1344 1345 return New; 1346} 1347 1348/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 1349/// types into constant array types in certain situations which would otherwise 1350/// be errors (for GCC compatibility). 1351static QualType TryToFixInvalidVariablyModifiedType(QualType T, 1352 ASTContext &Context, 1353 bool &SizeIsNegative) { 1354 // This method tries to turn a variable array into a constant 1355 // array even when the size isn't an ICE. This is necessary 1356 // for compatibility with code that depends on gcc's buggy 1357 // constant expression folding, like struct {char x[(int)(char*)2];} 1358 SizeIsNegative = false; 1359 1360 if (const PointerType* PTy = dyn_cast<PointerType>(T)) { 1361 QualType Pointee = PTy->getPointeeType(); 1362 QualType FixedType = 1363 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 1364 if (FixedType.isNull()) return FixedType; 1365 FixedType = Context.getPointerType(FixedType); 1366 FixedType.setCVRQualifiers(T.getCVRQualifiers()); 1367 return FixedType; 1368 } 1369 1370 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 1371 if (!VLATy) 1372 return QualType(); 1373 // FIXME: We should probably handle this case 1374 if (VLATy->getElementType()->isVariablyModifiedType()) 1375 return QualType(); 1376 1377 Expr::EvalResult EvalResult; 1378 if (!VLATy->getSizeExpr() || 1379 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 1380 !EvalResult.Val.isInt()) 1381 return QualType(); 1382 1383 llvm::APSInt &Res = EvalResult.Val.getInt(); 1384 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) 1385 return Context.getConstantArrayType(VLATy->getElementType(), 1386 Res, ArrayType::Normal, 0); 1387 1388 SizeIsNegative = true; 1389 return QualType(); 1390} 1391 1392/// \brief Register the given locally-scoped external C declaration so 1393/// that it can be found later for redeclarations 1394void 1395Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, NamedDecl *PrevDecl, 1396 Scope *S) { 1397 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 1398 "Decl is not a locally-scoped decl!"); 1399 // Note that we have a locally-scoped external with this name. 1400 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 1401 1402 if (!PrevDecl) 1403 return; 1404 1405 // If there was a previous declaration of this variable, it may be 1406 // in our identifier chain. Update the identifier chain with the new 1407 // declaration. 1408 if (IdResolver.ReplaceDecl(PrevDecl, ND)) { 1409 // The previous declaration was found on the identifer resolver 1410 // chain, so remove it from its scope. 1411 while (S && !S->isDeclScope(PrevDecl)) 1412 S = S->getParent(); 1413 1414 if (S) 1415 S->RemoveDecl(PrevDecl); 1416 } 1417} 1418 1419NamedDecl* 1420Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1421 QualType R, Decl* LastDeclarator, 1422 Decl* PrevDecl, bool& InvalidDecl, 1423 bool &Redeclaration) { 1424 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1425 if (D.getCXXScopeSpec().isSet()) { 1426 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1427 << D.getCXXScopeSpec().getRange(); 1428 InvalidDecl = true; 1429 // Pretend we didn't see the scope specifier. 1430 DC = 0; 1431 } 1432 1433 if (getLangOptions().CPlusPlus) { 1434 // Check that there are no default arguments (C++ only). 1435 CheckExtraCXXDefaultArguments(D); 1436 1437 if (D.getDeclSpec().isVirtualSpecified()) 1438 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1439 diag::err_virtual_non_function); 1440 } 1441 1442 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, LastDeclarator); 1443 if (!NewTD) return 0; 1444 1445 // Handle attributes prior to checking for duplicates in MergeVarDecl 1446 ProcessDeclAttributes(NewTD, D); 1447 // Merge the decl with the existing one if appropriate. If the decl is 1448 // in an outer scope, it isn't the same thing. 1449 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1450 Redeclaration = true; 1451 if (MergeTypeDefDecl(NewTD, PrevDecl)) 1452 InvalidDecl = true; 1453 } 1454 1455 if (S->getFnParent() == 0) { 1456 QualType T = NewTD->getUnderlyingType(); 1457 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1458 // then it shall have block scope. 1459 if (T->isVariablyModifiedType()) { 1460 bool SizeIsNegative; 1461 QualType FixedTy = 1462 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1463 if (!FixedTy.isNull()) { 1464 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 1465 NewTD->setUnderlyingType(FixedTy); 1466 } else { 1467 if (SizeIsNegative) 1468 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 1469 else if (T->isVariableArrayType()) 1470 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1471 else 1472 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1473 InvalidDecl = true; 1474 } 1475 } 1476 } 1477 return NewTD; 1478} 1479 1480/// \brief Determines whether the given declaration is an out-of-scope 1481/// previous declaration. 1482/// 1483/// This routine should be invoked when name lookup has found a 1484/// previous declaration (PrevDecl) that is not in the scope where a 1485/// new declaration by the same name is being introduced. If the new 1486/// declaration occurs in a local scope, previous declarations with 1487/// linkage may still be considered previous declarations (C99 1488/// 6.2.2p4-5, C++ [basic.link]p6). 1489/// 1490/// \param PrevDecl the previous declaration found by name 1491/// lookup 1492/// 1493/// \param DC the context in which the new declaration is being 1494/// declared. 1495/// 1496/// \returns true if PrevDecl is an out-of-scope previous declaration 1497/// for a new delcaration with the same name. 1498static bool 1499isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 1500 ASTContext &Context) { 1501 if (!PrevDecl) 1502 return 0; 1503 1504 // FIXME: PrevDecl could be an OverloadedFunctionDecl, in which 1505 // case we need to check each of the overloaded functions. 1506 if (!PrevDecl->hasLinkage()) 1507 return false; 1508 1509 if (Context.getLangOptions().CPlusPlus) { 1510 // C++ [basic.link]p6: 1511 // If there is a visible declaration of an entity with linkage 1512 // having the same name and type, ignoring entities declared 1513 // outside the innermost enclosing namespace scope, the block 1514 // scope declaration declares that same entity and receives the 1515 // linkage of the previous declaration. 1516 DeclContext *OuterContext = DC->getLookupContext(); 1517 if (!OuterContext->isFunctionOrMethod()) 1518 // This rule only applies to block-scope declarations. 1519 return false; 1520 else { 1521 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 1522 if (PrevOuterContext->isRecord()) 1523 // We found a member function: ignore it. 1524 return false; 1525 else { 1526 // Find the innermost enclosing namespace for the new and 1527 // previous declarations. 1528 while (!OuterContext->isFileContext()) 1529 OuterContext = OuterContext->getParent(); 1530 while (!PrevOuterContext->isFileContext()) 1531 PrevOuterContext = PrevOuterContext->getParent(); 1532 1533 // The previous declaration is in a different namespace, so it 1534 // isn't the same function. 1535 if (OuterContext->getPrimaryContext() != 1536 PrevOuterContext->getPrimaryContext()) 1537 return false; 1538 } 1539 } 1540 } 1541 1542 return true; 1543} 1544 1545NamedDecl* 1546Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1547 QualType R, Decl* LastDeclarator, 1548 NamedDecl* PrevDecl, bool& InvalidDecl, 1549 bool &Redeclaration) { 1550 DeclarationName Name = GetNameForDeclarator(D); 1551 1552 // Check that there are no default arguments (C++ only). 1553 if (getLangOptions().CPlusPlus) 1554 CheckExtraCXXDefaultArguments(D); 1555 1556 if (R.getTypePtr()->isObjCInterfaceType()) { 1557 Diag(D.getIdentifierLoc(), diag::err_statically_allocated_object); 1558 InvalidDecl = true; 1559 } 1560 1561 VarDecl *NewVD; 1562 VarDecl::StorageClass SC; 1563 switch (D.getDeclSpec().getStorageClassSpec()) { 1564 default: assert(0 && "Unknown storage class!"); 1565 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1566 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1567 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1568 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1569 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1570 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1571 case DeclSpec::SCS_mutable: 1572 // mutable can only appear on non-static class members, so it's always 1573 // an error here 1574 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1575 InvalidDecl = true; 1576 SC = VarDecl::None; 1577 break; 1578 } 1579 1580 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1581 if (!II) { 1582 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1583 << Name.getAsString(); 1584 return 0; 1585 } 1586 1587 if (D.getDeclSpec().isVirtualSpecified()) 1588 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1589 diag::err_virtual_non_function); 1590 1591 bool ThreadSpecified = D.getDeclSpec().isThreadSpecified(); 1592 if (!DC->isRecord() && S->getFnParent() == 0) { 1593 // C99 6.9p2: The storage-class specifiers auto and register shall not 1594 // appear in the declaration specifiers in an external declaration. 1595 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 1596 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 1597 InvalidDecl = true; 1598 } 1599 } 1600 if (DC->isRecord() && !CurContext->isRecord()) { 1601 // This is an out-of-line definition of a static data member. 1602 if (SC == VarDecl::Static) { 1603 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1604 diag::err_static_out_of_line) 1605 << CodeModificationHint::CreateRemoval( 1606 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 1607 } else if (SC == VarDecl::None) 1608 SC = VarDecl::Static; 1609 } 1610 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1611 II, R, SC, 1612 // FIXME: Move to DeclGroup... 1613 D.getDeclSpec().getSourceRange().getBegin()); 1614 NewVD->setThreadSpecified(ThreadSpecified); 1615 NewVD->setNextDeclarator(LastDeclarator); 1616 1617 // Set the lexical context. If the declarator has a C++ scope specifier, the 1618 // lexical context will be different from the semantic context. 1619 NewVD->setLexicalDeclContext(CurContext); 1620 1621 // Handle attributes prior to checking for duplicates in MergeVarDecl 1622 ProcessDeclAttributes(NewVD, D); 1623 1624 // Handle GNU asm-label extension (encoded as an attribute). 1625 if (Expr *E = (Expr*) D.getAsmLabel()) { 1626 // The parser guarantees this is a string. 1627 StringLiteral *SE = cast<StringLiteral>(E); 1628 NewVD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 1629 SE->getByteLength()))); 1630 } 1631 1632 // Emit an error if an address space was applied to decl with local storage. 1633 // This includes arrays of objects with address space qualifiers, but not 1634 // automatic variables that point to other address spaces. 1635 // ISO/IEC TR 18037 S5.1.2 1636 if (NewVD->hasLocalStorage() && (NewVD->getType().getAddressSpace() != 0)) { 1637 Diag(D.getIdentifierLoc(), diag::err_as_qualified_auto_decl); 1638 InvalidDecl = true; 1639 } 1640 1641 if (NewVD->hasLocalStorage() && NewVD->getType().isObjCGCWeak()) { 1642 Diag(D.getIdentifierLoc(), diag::warn_attribute_weak_on_local); 1643 } 1644 1645 bool isIllegalVLA = R->isVariableArrayType() && NewVD->hasGlobalStorage(); 1646 bool isIllegalVM = R->isVariablyModifiedType() && NewVD->hasLinkage(); 1647 if (isIllegalVLA || isIllegalVM) { 1648 bool SizeIsNegative; 1649 QualType FixedTy = 1650 TryToFixInvalidVariablyModifiedType(R, Context, SizeIsNegative); 1651 if (!FixedTy.isNull()) { 1652 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 1653 NewVD->setType(FixedTy); 1654 } else if (R->isVariableArrayType()) { 1655 NewVD->setInvalidDecl(); 1656 1657 const VariableArrayType *VAT = Context.getAsVariableArrayType(R); 1658 // FIXME: This won't give the correct result for 1659 // int a[10][n]; 1660 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 1661 1662 if (NewVD->isFileVarDecl()) 1663 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 1664 << SizeRange; 1665 else if (NewVD->getStorageClass() == VarDecl::Static) 1666 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 1667 << SizeRange; 1668 else 1669 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 1670 << SizeRange; 1671 } else { 1672 InvalidDecl = true; 1673 1674 if (NewVD->isFileVarDecl()) 1675 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 1676 else 1677 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 1678 } 1679 } 1680 1681 // If name lookup finds a previous declaration that is not in the 1682 // same scope as the new declaration, this may still be an 1683 // acceptable redeclaration. 1684 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 1685 !(NewVD->hasLinkage() && 1686 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 1687 PrevDecl = 0; 1688 1689 if (!PrevDecl && NewVD->isExternC(Context)) { 1690 // Since we did not find anything by this name and we're declaring 1691 // an extern "C" variable, look for a non-visible extern "C" 1692 // declaration with the same name. 1693 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 1694 = LocallyScopedExternalDecls.find(Name); 1695 if (Pos != LocallyScopedExternalDecls.end()) 1696 PrevDecl = Pos->second; 1697 } 1698 1699 // Merge the decl with the existing one if appropriate. 1700 if (PrevDecl) { 1701 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 1702 // The user tried to define a non-static data member 1703 // out-of-line (C++ [dcl.meaning]p1). 1704 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 1705 << D.getCXXScopeSpec().getRange(); 1706 NewVD->Destroy(Context); 1707 return 0; 1708 } 1709 1710 Redeclaration = true; 1711 if (MergeVarDecl(NewVD, PrevDecl)) 1712 InvalidDecl = true; 1713 } else if (D.getCXXScopeSpec().isSet()) { 1714 // No previous declaration in the qualifying scope. 1715 Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 1716 << Name << D.getCXXScopeSpec().getRange(); 1717 InvalidDecl = true; 1718 } 1719 1720 if (!InvalidDecl && R->isVoidType() && !NewVD->hasExternalStorage()) { 1721 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 1722 << R; 1723 InvalidDecl = true; 1724 } 1725 1726 1727 // If this is a locally-scoped extern C variable, update the map of 1728 // such variables. 1729 if (CurContext->isFunctionOrMethod() && NewVD->isExternC(Context) && 1730 !InvalidDecl) 1731 RegisterLocallyScopedExternCDecl(NewVD, PrevDecl, S); 1732 1733 return NewVD; 1734} 1735 1736NamedDecl* 1737Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1738 QualType R, Decl *LastDeclarator, 1739 NamedDecl* PrevDecl, bool IsFunctionDefinition, 1740 bool& InvalidDecl, bool &Redeclaration) { 1741 assert(R.getTypePtr()->isFunctionType()); 1742 1743 DeclarationName Name = GetNameForDeclarator(D); 1744 FunctionDecl::StorageClass SC = FunctionDecl::None; 1745 switch (D.getDeclSpec().getStorageClassSpec()) { 1746 default: assert(0 && "Unknown storage class!"); 1747 case DeclSpec::SCS_auto: 1748 case DeclSpec::SCS_register: 1749 case DeclSpec::SCS_mutable: 1750 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1751 diag::err_typecheck_sclass_func); 1752 InvalidDecl = true; 1753 break; 1754 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 1755 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 1756 case DeclSpec::SCS_static: { 1757 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 1758 // C99 6.7.1p5: 1759 // The declaration of an identifier for a function that has 1760 // block scope shall have no explicit storage-class specifier 1761 // other than extern 1762 // See also (C++ [dcl.stc]p4). 1763 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1764 diag::err_static_block_func); 1765 SC = FunctionDecl::None; 1766 } else 1767 SC = FunctionDecl::Static; 1768 break; 1769 } 1770 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 1771 } 1772 1773 bool isInline = D.getDeclSpec().isInlineSpecified(); 1774 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1775 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 1776 1777 bool isVirtualOkay = false; 1778 FunctionDecl *NewFD; 1779 if (D.getKind() == Declarator::DK_Constructor) { 1780 // This is a C++ constructor declaration. 1781 assert(DC->isRecord() && 1782 "Constructors can only be declared in a member context"); 1783 1784 InvalidDecl = InvalidDecl || CheckConstructorDeclarator(D, R, SC); 1785 1786 // Create the new declaration 1787 NewFD = CXXConstructorDecl::Create(Context, 1788 cast<CXXRecordDecl>(DC), 1789 D.getIdentifierLoc(), Name, R, 1790 isExplicit, isInline, 1791 /*isImplicitlyDeclared=*/false); 1792 1793 if (InvalidDecl) 1794 NewFD->setInvalidDecl(); 1795 } else if (D.getKind() == Declarator::DK_Destructor) { 1796 // This is a C++ destructor declaration. 1797 if (DC->isRecord()) { 1798 InvalidDecl = InvalidDecl || CheckDestructorDeclarator(D, R, SC); 1799 1800 NewFD = CXXDestructorDecl::Create(Context, 1801 cast<CXXRecordDecl>(DC), 1802 D.getIdentifierLoc(), Name, R, 1803 isInline, 1804 /*isImplicitlyDeclared=*/false); 1805 1806 if (InvalidDecl) 1807 NewFD->setInvalidDecl(); 1808 1809 isVirtualOkay = true; 1810 } else { 1811 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 1812 1813 // Create a FunctionDecl to satisfy the function definition parsing 1814 // code path. 1815 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 1816 Name, R, SC, isInline, 1817 /*hasPrototype=*/true, 1818 // FIXME: Move to DeclGroup... 1819 D.getDeclSpec().getSourceRange().getBegin()); 1820 InvalidDecl = true; 1821 NewFD->setInvalidDecl(); 1822 } 1823 } else if (D.getKind() == Declarator::DK_Conversion) { 1824 if (!DC->isRecord()) { 1825 Diag(D.getIdentifierLoc(), 1826 diag::err_conv_function_not_member); 1827 return 0; 1828 } else { 1829 InvalidDecl = InvalidDecl || CheckConversionDeclarator(D, R, SC); 1830 1831 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 1832 D.getIdentifierLoc(), Name, R, 1833 isInline, isExplicit); 1834 1835 if (InvalidDecl) 1836 NewFD->setInvalidDecl(); 1837 1838 isVirtualOkay = true; 1839 } 1840 } else if (DC->isRecord()) { 1841 // This is a C++ method declaration. 1842 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 1843 D.getIdentifierLoc(), Name, R, 1844 (SC == FunctionDecl::Static), isInline); 1845 1846 isVirtualOkay = (SC != FunctionDecl::Static); 1847 } else { 1848 NewFD = FunctionDecl::Create(Context, DC, 1849 D.getIdentifierLoc(), 1850 Name, R, SC, isInline, 1851 /*hasPrototype=*/ 1852 (getLangOptions().CPlusPlus || 1853 (D.getNumTypeObjects() && 1854 D.getTypeObject(0).Fun.hasPrototype)), 1855 // FIXME: Move to DeclGroup... 1856 D.getDeclSpec().getSourceRange().getBegin()); 1857 } 1858 NewFD->setNextDeclarator(LastDeclarator); 1859 1860 // Set the lexical context. If the declarator has a C++ 1861 // scope specifier, the lexical context will be different 1862 // from the semantic context. 1863 NewFD->setLexicalDeclContext(CurContext); 1864 1865 // C++ [dcl.fct.spec]p5: 1866 // The virtual specifier shall only be used in declarations of 1867 // nonstatic class member functions that appear within a 1868 // member-specification of a class declaration; see 10.3. 1869 // 1870 // FIXME: Checking the 'virtual' specifier is not sufficient. A 1871 // function is also virtual if it overrides an already virtual 1872 // function. This is important to do here because it's part of the 1873 // declaration. 1874 if (isVirtual && !InvalidDecl) { 1875 if (!isVirtualOkay) { 1876 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1877 diag::err_virtual_non_function); 1878 } else if (!CurContext->isRecord()) { 1879 // 'virtual' was specified outside of the class. 1880 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 1881 << CodeModificationHint::CreateRemoval( 1882 SourceRange(D.getDeclSpec().getVirtualSpecLoc())); 1883 } else { 1884 // Okay: Add virtual to the method. 1885 cast<CXXMethodDecl>(NewFD)->setVirtual(); 1886 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 1887 CurClass->setAggregate(false); 1888 CurClass->setPOD(false); 1889 CurClass->setPolymorphic(true); 1890 } 1891 } 1892 1893 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 1894 !CurContext->isRecord()) { 1895 // C++ [class.static]p1: 1896 // A data or function member of a class may be declared static 1897 // in a class definition, in which case it is a static member of 1898 // the class. 1899 1900 // Complain about the 'static' specifier if it's on an out-of-line 1901 // member function definition. 1902 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1903 diag::err_static_out_of_line) 1904 << CodeModificationHint::CreateRemoval( 1905 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 1906 } 1907 1908 // Handle GNU asm-label extension (encoded as an attribute). 1909 if (Expr *E = (Expr*) D.getAsmLabel()) { 1910 // The parser guarantees this is a string. 1911 StringLiteral *SE = cast<StringLiteral>(E); 1912 NewFD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 1913 SE->getByteLength()))); 1914 } 1915 1916 // Copy the parameter declarations from the declarator D to 1917 // the function declaration NewFD, if they are available. 1918 if (D.getNumTypeObjects() > 0) { 1919 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1920 1921 // Create Decl objects for each parameter, adding them to the 1922 // FunctionDecl. 1923 llvm::SmallVector<ParmVarDecl*, 16> Params; 1924 1925 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 1926 // function that takes no arguments, not a function that takes a 1927 // single void argument. 1928 // We let through "const void" here because Sema::GetTypeForDeclarator 1929 // already checks for that case. 1930 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1931 FTI.ArgInfo[0].Param && 1932 ((ParmVarDecl*)FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 1933 // empty arg list, don't push any params. 1934 ParmVarDecl *Param = (ParmVarDecl*)FTI.ArgInfo[0].Param; 1935 1936 // In C++, the empty parameter-type-list must be spelled "void"; a 1937 // typedef of void is not permitted. 1938 if (getLangOptions().CPlusPlus && 1939 Param->getType().getUnqualifiedType() != Context.VoidTy) { 1940 Diag(Param->getLocation(), diag::ext_param_typedef_of_void); 1941 } 1942 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 1943 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 1944 Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 1945 } 1946 1947 NewFD->setParams(Context, &Params[0], Params.size()); 1948 } else if (R->getAsTypedefType()) { 1949 // When we're declaring a function with a typedef, as in the 1950 // following example, we'll need to synthesize (unnamed) 1951 // parameters for use in the declaration. 1952 // 1953 // @code 1954 // typedef void fn(int); 1955 // fn f; 1956 // @endcode 1957 const FunctionProtoType *FT = R->getAsFunctionProtoType(); 1958 if (!FT) { 1959 // This is a typedef of a function with no prototype, so we 1960 // don't need to do anything. 1961 } else if ((FT->getNumArgs() == 0) || 1962 (FT->getNumArgs() == 1 && !FT->isVariadic() && 1963 FT->getArgType(0)->isVoidType())) { 1964 // This is a zero-argument function. We don't need to do anything. 1965 } else { 1966 // Synthesize a parameter for each argument type. 1967 llvm::SmallVector<ParmVarDecl*, 16> Params; 1968 for (FunctionProtoType::arg_type_iterator ArgType = FT->arg_type_begin(); 1969 ArgType != FT->arg_type_end(); ++ArgType) { 1970 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, 1971 SourceLocation(), 0, 1972 *ArgType, VarDecl::None, 1973 0); 1974 Param->setImplicit(); 1975 Params.push_back(Param); 1976 } 1977 1978 NewFD->setParams(Context, &Params[0], Params.size()); 1979 } 1980 } 1981 1982 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) 1983 InvalidDecl = InvalidDecl || CheckConstructor(Constructor); 1984 else if (isa<CXXDestructorDecl>(NewFD)) { 1985 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 1986 Record->setUserDeclaredDestructor(true); 1987 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 1988 // user-defined destructor. 1989 Record->setPOD(false); 1990 } else if (CXXConversionDecl *Conversion = 1991 dyn_cast<CXXConversionDecl>(NewFD)) 1992 ActOnConversionDeclarator(Conversion); 1993 1994 // Extra checking for C++ overloaded operators (C++ [over.oper]). 1995 if (NewFD->isOverloadedOperator() && 1996 CheckOverloadedOperatorDeclaration(NewFD)) 1997 NewFD->setInvalidDecl(); 1998 1999 // If name lookup finds a previous declaration that is not in the 2000 // same scope as the new declaration, this may still be an 2001 // acceptable redeclaration. 2002 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 2003 !(NewFD->hasLinkage() && 2004 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 2005 PrevDecl = 0; 2006 2007 if (!PrevDecl && NewFD->isExternC(Context)) { 2008 // Since we did not find anything by this name and we're declaring 2009 // an extern "C" function, look for a non-visible extern "C" 2010 // declaration with the same name. 2011 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2012 = LocallyScopedExternalDecls.find(Name); 2013 if (Pos != LocallyScopedExternalDecls.end()) 2014 PrevDecl = Pos->second; 2015 } 2016 2017 // Merge or overload the declaration with an existing declaration of 2018 // the same name, if appropriate. 2019 bool OverloadableAttrRequired = false; 2020 if (PrevDecl) { 2021 // Determine whether NewFD is an overload of PrevDecl or 2022 // a declaration that requires merging. If it's an overload, 2023 // there's no more work to do here; we'll just add the new 2024 // function to the scope. 2025 OverloadedFunctionDecl::function_iterator MatchedDecl; 2026 2027 if (!getLangOptions().CPlusPlus && 2028 AllowOverloadingOfFunction(PrevDecl, Context)) { 2029 OverloadableAttrRequired = true; 2030 2031 // Functions marked "overloadable" must have a prototype (that 2032 // we can't get through declaration merging). 2033 if (!R->getAsFunctionProtoType()) { 2034 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_no_prototype) 2035 << NewFD; 2036 InvalidDecl = true; 2037 Redeclaration = true; 2038 2039 // Turn this into a variadic function with no parameters. 2040 R = Context.getFunctionType(R->getAsFunctionType()->getResultType(), 2041 0, 0, true, 0); 2042 NewFD->setType(R); 2043 } 2044 } 2045 2046 if (PrevDecl && 2047 (!AllowOverloadingOfFunction(PrevDecl, Context) || 2048 !IsOverload(NewFD, PrevDecl, MatchedDecl))) { 2049 Redeclaration = true; 2050 Decl *OldDecl = PrevDecl; 2051 2052 // If PrevDecl was an overloaded function, extract the 2053 // FunctionDecl that matched. 2054 if (isa<OverloadedFunctionDecl>(PrevDecl)) 2055 OldDecl = *MatchedDecl; 2056 2057 // NewFD and PrevDecl represent declarations that need to be 2058 // merged. 2059 if (MergeFunctionDecl(NewFD, OldDecl)) 2060 InvalidDecl = true; 2061 2062 if (!InvalidDecl) { 2063 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 2064 2065 // An out-of-line member function declaration must also be a 2066 // definition (C++ [dcl.meaning]p1). 2067 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 2068 !InvalidDecl) { 2069 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2070 << D.getCXXScopeSpec().getRange(); 2071 NewFD->setInvalidDecl(); 2072 } 2073 } 2074 } 2075 } 2076 2077 if (D.getCXXScopeSpec().isSet() && 2078 (!PrevDecl || !Redeclaration)) { 2079 // The user tried to provide an out-of-line definition for a 2080 // function that is a member of a class or namespace, but there 2081 // was no such member function declared (C++ [class.mfct]p2, 2082 // C++ [namespace.memdef]p2). For example: 2083 // 2084 // class X { 2085 // void f() const; 2086 // }; 2087 // 2088 // void X::f() { } // ill-formed 2089 // 2090 // Complain about this problem, and attempt to suggest close 2091 // matches (e.g., those that differ only in cv-qualifiers and 2092 // whether the parameter types are references). 2093 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 2094 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 2095 InvalidDecl = true; 2096 2097 LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 2098 true); 2099 assert(!Prev.isAmbiguous() && 2100 "Cannot have an ambiguity in previous-declaration lookup"); 2101 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 2102 Func != FuncEnd; ++Func) { 2103 if (isa<FunctionDecl>(*Func) && 2104 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 2105 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 2106 } 2107 2108 PrevDecl = 0; 2109 } 2110 2111 // Handle attributes. We need to have merged decls when handling attributes 2112 // (for example to check for conflicts, etc). 2113 ProcessDeclAttributes(NewFD, D); 2114 AddKnownFunctionAttributes(NewFD); 2115 2116 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 2117 // If a function name is overloadable in C, then every function 2118 // with that name must be marked "overloadable". 2119 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 2120 << Redeclaration << NewFD; 2121 if (PrevDecl) 2122 Diag(PrevDecl->getLocation(), 2123 diag::note_attribute_overloadable_prev_overload); 2124 NewFD->addAttr(::new (Context) OverloadableAttr()); 2125 } 2126 2127 if (getLangOptions().CPlusPlus) { 2128 // In C++, check default arguments now that we have merged decls. Unless 2129 // the lexical context is the class, because in this case this is done 2130 // during delayed parsing anyway. 2131 if (!CurContext->isRecord()) 2132 CheckCXXDefaultArguments(NewFD); 2133 2134 // An out-of-line member function declaration must also be a 2135 // definition (C++ [dcl.meaning]p1). 2136 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && !InvalidDecl) { 2137 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2138 << D.getCXXScopeSpec().getRange(); 2139 InvalidDecl = true; 2140 } 2141 } 2142 2143 // If this is a locally-scoped extern C function, update the 2144 // map of such names. 2145 if (CurContext->isFunctionOrMethod() && NewFD->isExternC(Context) 2146 && !InvalidDecl) 2147 RegisterLocallyScopedExternCDecl(NewFD, PrevDecl, S); 2148 2149 return NewFD; 2150} 2151 2152bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 2153 // FIXME: Need strict checking. In C89, we need to check for 2154 // any assignment, increment, decrement, function-calls, or 2155 // commas outside of a sizeof. In C99, it's the same list, 2156 // except that the aforementioned are allowed in unevaluated 2157 // expressions. Everything else falls under the 2158 // "may accept other forms of constant expressions" exception. 2159 // (We never end up here for C++, so the constant expression 2160 // rules there don't matter.) 2161 if (Init->isConstantInitializer(Context)) 2162 return false; 2163 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 2164 << Init->getSourceRange(); 2165 return true; 2166} 2167 2168void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init) { 2169 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 2170} 2171 2172/// AddInitializerToDecl - Adds the initializer Init to the 2173/// declaration dcl. If DirectInit is true, this is C++ direct 2174/// initialization rather than copy initialization. 2175void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init, bool DirectInit) { 2176 Decl *RealDecl = static_cast<Decl *>(dcl); 2177 // If there is no declaration, there was an error parsing it. Just ignore 2178 // the initializer. 2179 if (RealDecl == 0) 2180 return; 2181 2182 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 2183 // With declarators parsed the way they are, the parser cannot 2184 // distinguish between a normal initializer and a pure-specifier. 2185 // Thus this grotesque test. 2186 IntegerLiteral *IL; 2187 Expr *Init = static_cast<Expr *>(init.get()); 2188 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 2189 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 2190 if (Method->isVirtual()) 2191 Method->setPure(); 2192 else { 2193 Diag(Method->getLocation(), diag::err_non_virtual_pure) 2194 << Method->getDeclName() << Init->getSourceRange(); 2195 Method->setInvalidDecl(); 2196 } 2197 } else { 2198 Diag(Method->getLocation(), diag::err_member_function_initialization) 2199 << Method->getDeclName() << Init->getSourceRange(); 2200 Method->setInvalidDecl(); 2201 } 2202 return; 2203 } 2204 2205 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2206 if (!VDecl) { 2207 if (getLangOptions().CPlusPlus && 2208 RealDecl->getLexicalDeclContext()->isRecord() && 2209 isa<NamedDecl>(RealDecl)) 2210 Diag(RealDecl->getLocation(), diag::err_member_initialization) 2211 << cast<NamedDecl>(RealDecl)->getDeclName(); 2212 else 2213 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2214 RealDecl->setInvalidDecl(); 2215 return; 2216 } 2217 2218 const VarDecl *Def = 0; 2219 if (VDecl->getDefinition(Def)) { 2220 Diag(VDecl->getLocation(), diag::err_redefinition) 2221 << VDecl->getDeclName(); 2222 Diag(Def->getLocation(), diag::note_previous_definition); 2223 VDecl->setInvalidDecl(); 2224 return; 2225 } 2226 2227 // Take ownership of the expression, now that we're sure we have somewhere 2228 // to put it. 2229 Expr *Init = static_cast<Expr *>(init.release()); 2230 assert(Init && "missing initializer"); 2231 2232 // Get the decls type and save a reference for later, since 2233 // CheckInitializerTypes may change it. 2234 QualType DclT = VDecl->getType(), SavT = DclT; 2235 if (VDecl->isBlockVarDecl()) { 2236 VarDecl::StorageClass SC = VDecl->getStorageClass(); 2237 if (SC == VarDecl::Extern) { // C99 6.7.8p5 2238 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2239 VDecl->setInvalidDecl(); 2240 } else if (!VDecl->isInvalidDecl()) { 2241 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2242 VDecl->getDeclName(), DirectInit)) 2243 VDecl->setInvalidDecl(); 2244 2245 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2246 // Don't check invalid declarations to avoid emitting useless diagnostics. 2247 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2248 if (SC == VarDecl::Static) // C99 6.7.8p4. 2249 CheckForConstantInitializer(Init, DclT); 2250 } 2251 } 2252 } else if (VDecl->isStaticDataMember() && 2253 VDecl->getLexicalDeclContext()->isRecord()) { 2254 // This is an in-class initialization for a static data member, e.g., 2255 // 2256 // struct S { 2257 // static const int value = 17; 2258 // }; 2259 2260 // Attach the initializer 2261 VDecl->setInit(Init); 2262 2263 // C++ [class.mem]p4: 2264 // A member-declarator can contain a constant-initializer only 2265 // if it declares a static member (9.4) of const integral or 2266 // const enumeration type, see 9.4.2. 2267 QualType T = VDecl->getType(); 2268 if (!T->isDependentType() && 2269 (!Context.getCanonicalType(T).isConstQualified() || 2270 !T->isIntegralType())) { 2271 Diag(VDecl->getLocation(), diag::err_member_initialization) 2272 << VDecl->getDeclName() << Init->getSourceRange(); 2273 VDecl->setInvalidDecl(); 2274 } else { 2275 // C++ [class.static.data]p4: 2276 // If a static data member is of const integral or const 2277 // enumeration type, its declaration in the class definition 2278 // can specify a constant-initializer which shall be an 2279 // integral constant expression (5.19). 2280 if (!Init->isTypeDependent() && 2281 !Init->getType()->isIntegralType()) { 2282 // We have a non-dependent, non-integral or enumeration type. 2283 Diag(Init->getSourceRange().getBegin(), 2284 diag::err_in_class_initializer_non_integral_type) 2285 << Init->getType() << Init->getSourceRange(); 2286 VDecl->setInvalidDecl(); 2287 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 2288 // Check whether the expression is a constant expression. 2289 llvm::APSInt Value; 2290 SourceLocation Loc; 2291 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 2292 Diag(Loc, diag::err_in_class_initializer_non_constant) 2293 << Init->getSourceRange(); 2294 VDecl->setInvalidDecl(); 2295 } 2296 } 2297 } 2298 } else if (VDecl->isFileVarDecl()) { 2299 if (VDecl->getStorageClass() == VarDecl::Extern) 2300 Diag(VDecl->getLocation(), diag::warn_extern_init); 2301 if (!VDecl->isInvalidDecl()) 2302 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2303 VDecl->getDeclName(), DirectInit)) 2304 VDecl->setInvalidDecl(); 2305 2306 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2307 // Don't check invalid declarations to avoid emitting useless diagnostics. 2308 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2309 // C99 6.7.8p4. All file scoped initializers need to be constant. 2310 CheckForConstantInitializer(Init, DclT); 2311 } 2312 } 2313 // If the type changed, it means we had an incomplete type that was 2314 // completed by the initializer. For example: 2315 // int ary[] = { 1, 3, 5 }; 2316 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2317 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2318 VDecl->setType(DclT); 2319 Init->setType(DclT); 2320 } 2321 2322 // Attach the initializer to the decl. 2323 VDecl->setInit(Init); 2324 return; 2325} 2326 2327void Sema::ActOnUninitializedDecl(DeclTy *dcl) { 2328 Decl *RealDecl = static_cast<Decl *>(dcl); 2329 2330 // If there is no declaration, there was an error parsing it. Just ignore it. 2331 if (RealDecl == 0) 2332 return; 2333 2334 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2335 QualType Type = Var->getType(); 2336 // C++ [dcl.init.ref]p3: 2337 // The initializer can be omitted for a reference only in a 2338 // parameter declaration (8.3.5), in the declaration of a 2339 // function return type, in the declaration of a class member 2340 // within its class declaration (9.2), and where the extern 2341 // specifier is explicitly used. 2342 if (Type->isReferenceType() && 2343 Var->getStorageClass() != VarDecl::Extern && 2344 Var->getStorageClass() != VarDecl::PrivateExtern) { 2345 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2346 << Var->getDeclName() 2347 << SourceRange(Var->getLocation(), Var->getLocation()); 2348 Var->setInvalidDecl(); 2349 return; 2350 } 2351 2352 // C++ [dcl.init]p9: 2353 // 2354 // If no initializer is specified for an object, and the object 2355 // is of (possibly cv-qualified) non-POD class type (or array 2356 // thereof), the object shall be default-initialized; if the 2357 // object is of const-qualified type, the underlying class type 2358 // shall have a user-declared default constructor. 2359 if (getLangOptions().CPlusPlus) { 2360 QualType InitType = Type; 2361 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2362 InitType = Array->getElementType(); 2363 if (Var->getStorageClass() != VarDecl::Extern && 2364 Var->getStorageClass() != VarDecl::PrivateExtern && 2365 InitType->isRecordType()) { 2366 const CXXConstructorDecl *Constructor = 0; 2367 if (!RequireCompleteType(Var->getLocation(), InitType, 2368 diag::err_invalid_incomplete_type_use)) 2369 Constructor 2370 = PerformInitializationByConstructor(InitType, 0, 0, 2371 Var->getLocation(), 2372 SourceRange(Var->getLocation(), 2373 Var->getLocation()), 2374 Var->getDeclName(), 2375 IK_Default); 2376 if (!Constructor) 2377 Var->setInvalidDecl(); 2378 } 2379 } 2380 2381#if 0 2382 // FIXME: Temporarily disabled because we are not properly parsing 2383 // linkage specifications on declarations, e.g., 2384 // 2385 // extern "C" const CGPoint CGPointerZero; 2386 // 2387 // C++ [dcl.init]p9: 2388 // 2389 // If no initializer is specified for an object, and the 2390 // object is of (possibly cv-qualified) non-POD class type (or 2391 // array thereof), the object shall be default-initialized; if 2392 // the object is of const-qualified type, the underlying class 2393 // type shall have a user-declared default 2394 // constructor. Otherwise, if no initializer is specified for 2395 // an object, the object and its subobjects, if any, have an 2396 // indeterminate initial value; if the object or any of its 2397 // subobjects are of const-qualified type, the program is 2398 // ill-formed. 2399 // 2400 // This isn't technically an error in C, so we don't diagnose it. 2401 // 2402 // FIXME: Actually perform the POD/user-defined default 2403 // constructor check. 2404 if (getLangOptions().CPlusPlus && 2405 Context.getCanonicalType(Type).isConstQualified() && 2406 Var->getStorageClass() != VarDecl::Extern) 2407 Diag(Var->getLocation(), diag::err_const_var_requires_init) 2408 << Var->getName() 2409 << SourceRange(Var->getLocation(), Var->getLocation()); 2410#endif 2411 } 2412} 2413 2414/// The declarators are chained together backwards, reverse the list. 2415Sema::DeclTy *Sema::FinalizeDeclaratorGroup(Scope *S, DeclTy *group) { 2416 // Often we have single declarators, handle them quickly. 2417 Decl *Group = static_cast<Decl*>(group); 2418 if (Group == 0) 2419 return 0; 2420 2421 Decl *NewGroup = 0; 2422 if (Group->getNextDeclarator() == 0) 2423 NewGroup = Group; 2424 else { // reverse the list. 2425 while (Group) { 2426 Decl *Next = Group->getNextDeclarator(); 2427 Group->setNextDeclarator(NewGroup); 2428 NewGroup = Group; 2429 Group = Next; 2430 } 2431 } 2432 // Perform semantic analysis that depends on having fully processed both 2433 // the declarator and initializer. 2434 for (Decl *ID = NewGroup; ID; ID = ID->getNextDeclarator()) { 2435 VarDecl *IDecl = dyn_cast<VarDecl>(ID); 2436 if (!IDecl) 2437 continue; 2438 QualType T = IDecl->getType(); 2439 2440 // Block scope. C99 6.7p7: If an identifier for an object is declared with 2441 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 2442 if (IDecl->isBlockVarDecl() && 2443 IDecl->getStorageClass() != VarDecl::Extern) { 2444 if (!IDecl->isInvalidDecl() && 2445 RequireCompleteType(IDecl->getLocation(), T, 2446 diag::err_typecheck_decl_incomplete_type)) 2447 IDecl->setInvalidDecl(); 2448 } 2449 // File scope. C99 6.9.2p2: A declaration of an identifier for and 2450 // object that has file scope without an initializer, and without a 2451 // storage-class specifier or with the storage-class specifier "static", 2452 // constitutes a tentative definition. Note: A tentative definition with 2453 // external linkage is valid (C99 6.2.2p5). 2454 if (IDecl->isTentativeDefinition(Context)) { 2455 QualType CheckType = T; 2456 unsigned DiagID = diag::err_typecheck_decl_incomplete_type; 2457 2458 const IncompleteArrayType *ArrayT = Context.getAsIncompleteArrayType(T); 2459 if (ArrayT) { 2460 CheckType = ArrayT->getElementType(); 2461 DiagID = diag::err_illegal_decl_array_incomplete_type; 2462 } 2463 2464 if (IDecl->isInvalidDecl()) { 2465 // Do nothing with invalid declarations 2466 } else if ((ArrayT || IDecl->getStorageClass() == VarDecl::Static) && 2467 RequireCompleteType(IDecl->getLocation(), CheckType, DiagID)) { 2468 // C99 6.9.2p3: If the declaration of an identifier for an object is 2469 // a tentative definition and has internal linkage (C99 6.2.2p3), the 2470 // declared type shall not be an incomplete type. 2471 IDecl->setInvalidDecl(); 2472 } 2473 } 2474 } 2475 return NewGroup; 2476} 2477 2478/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 2479/// to introduce parameters into function prototype scope. 2480Sema::DeclTy * 2481Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 2482 const DeclSpec &DS = D.getDeclSpec(); 2483 2484 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 2485 VarDecl::StorageClass StorageClass = VarDecl::None; 2486 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2487 StorageClass = VarDecl::Register; 2488 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2489 Diag(DS.getStorageClassSpecLoc(), 2490 diag::err_invalid_storage_class_in_func_decl); 2491 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2492 } 2493 if (DS.isThreadSpecified()) { 2494 Diag(DS.getThreadSpecLoc(), 2495 diag::err_invalid_storage_class_in_func_decl); 2496 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2497 } 2498 2499 // Check that there are no default arguments inside the type of this 2500 // parameter (C++ only). 2501 if (getLangOptions().CPlusPlus) 2502 CheckExtraCXXDefaultArguments(D); 2503 2504 // In this context, we *do not* check D.getInvalidType(). If the declarator 2505 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 2506 // though it will not reflect the user specified type. 2507 QualType parmDeclType = GetTypeForDeclarator(D, S); 2508 2509 assert(!parmDeclType.isNull() && "GetTypeForDeclarator() returned null type"); 2510 2511 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 2512 // Can this happen for params? We already checked that they don't conflict 2513 // among each other. Here they can only shadow globals, which is ok. 2514 IdentifierInfo *II = D.getIdentifier(); 2515 if (II) { 2516 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2517 if (PrevDecl->isTemplateParameter()) { 2518 // Maybe we will complain about the shadowed template parameter. 2519 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2520 // Just pretend that we didn't see the previous declaration. 2521 PrevDecl = 0; 2522 } else if (S->isDeclScope(PrevDecl)) { 2523 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 2524 2525 // Recover by removing the name 2526 II = 0; 2527 D.SetIdentifier(0, D.getIdentifierLoc()); 2528 } 2529 } 2530 } 2531 2532 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 2533 // Doing the promotion here has a win and a loss. The win is the type for 2534 // both Decl's and DeclRefExpr's will match (a convenient invariant for the 2535 // code generator). The loss is the orginal type isn't preserved. For example: 2536 // 2537 // void func(int parmvardecl[5]) { // convert "int [5]" to "int *" 2538 // int blockvardecl[5]; 2539 // sizeof(parmvardecl); // size == 4 2540 // sizeof(blockvardecl); // size == 20 2541 // } 2542 // 2543 // For expressions, all implicit conversions are captured using the 2544 // ImplicitCastExpr AST node (we have no such mechanism for Decl's). 2545 // 2546 // FIXME: If a source translation tool needs to see the original type, then 2547 // we need to consider storing both types (in ParmVarDecl)... 2548 // 2549 if (parmDeclType->isArrayType()) { 2550 // int x[restrict 4] -> int *restrict 2551 parmDeclType = Context.getArrayDecayedType(parmDeclType); 2552 } else if (parmDeclType->isFunctionType()) 2553 parmDeclType = Context.getPointerType(parmDeclType); 2554 2555 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, 2556 D.getIdentifierLoc(), II, 2557 parmDeclType, StorageClass, 2558 0); 2559 2560 if (D.getInvalidType()) 2561 New->setInvalidDecl(); 2562 2563 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 2564 if (D.getCXXScopeSpec().isSet()) { 2565 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 2566 << D.getCXXScopeSpec().getRange(); 2567 New->setInvalidDecl(); 2568 } 2569 // Parameter declarators cannot be interface types. All ObjC objects are 2570 // passed by reference. 2571 if (parmDeclType->isObjCInterfaceType()) { 2572 Diag(D.getIdentifierLoc(), diag::err_object_cannot_be_by_value) 2573 << "passed"; 2574 New->setInvalidDecl(); 2575 } 2576 2577 // Add the parameter declaration into this scope. 2578 S->AddDecl(New); 2579 if (II) 2580 IdResolver.AddDecl(New); 2581 2582 ProcessDeclAttributes(New, D); 2583 return New; 2584 2585} 2586 2587void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D) { 2588 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2589 "Not a function declarator!"); 2590 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2591 2592 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 2593 // for a K&R function. 2594 if (!FTI.hasPrototype) { 2595 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2596 if (FTI.ArgInfo[i].Param == 0) { 2597 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 2598 << FTI.ArgInfo[i].Ident; 2599 // Implicitly declare the argument as type 'int' for lack of a better 2600 // type. 2601 DeclSpec DS; 2602 const char* PrevSpec; // unused 2603 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 2604 PrevSpec); 2605 Declarator ParamD(DS, Declarator::KNRTypeListContext); 2606 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 2607 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 2608 } 2609 } 2610 } 2611} 2612 2613Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 2614 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 2615 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2616 "Not a function declarator!"); 2617 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2618 2619 if (FTI.hasPrototype) { 2620 // FIXME: Diagnose arguments without names in C. 2621 } 2622 2623 Scope *ParentScope = FnBodyScope->getParent(); 2624 2625 return ActOnStartOfFunctionDef(FnBodyScope, 2626 ActOnDeclarator(ParentScope, D, 0, 2627 /*IsFunctionDefinition=*/true)); 2628} 2629 2630Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclTy *D) { 2631 Decl *decl = static_cast<Decl*>(D); 2632 FunctionDecl *FD = cast<FunctionDecl>(decl); 2633 2634 ActiveScope = FnBodyScope; 2635 2636 // See if this is a redefinition. 2637 const FunctionDecl *Definition; 2638 if (FD->getBody(Definition)) { 2639 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 2640 Diag(Definition->getLocation(), diag::note_previous_definition); 2641 } 2642 2643 // Builtin functions cannot be defined. 2644 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 2645 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2646 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 2647 FD->setInvalidDecl(); 2648 } 2649 } 2650 2651 // The return type of a function definition must be complete 2652 // (C99 6.9.1p3) 2653 if (FD->getResultType()->isIncompleteType() && 2654 !FD->getResultType()->isVoidType()) { 2655 Diag(FD->getLocation(), diag::err_func_def_incomplete_result) << FD; 2656 FD->setInvalidDecl(); 2657 } 2658 2659 PushDeclContext(FnBodyScope, FD); 2660 2661 // Check the validity of our function parameters 2662 CheckParmsForFunctionDef(FD); 2663 2664 // Introduce our parameters into the function scope 2665 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 2666 ParmVarDecl *Param = FD->getParamDecl(p); 2667 Param->setOwningFunction(FD); 2668 2669 // If this has an identifier, add it to the scope stack. 2670 if (Param->getIdentifier()) 2671 PushOnScopeChains(Param, FnBodyScope); 2672 } 2673 2674 // Checking attributes of current function definition 2675 // dllimport attribute. 2676 if (FD->getAttr<DLLImportAttr>() && (!FD->getAttr<DLLExportAttr>())) { 2677 // dllimport attribute cannot be applied to definition. 2678 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 2679 Diag(FD->getLocation(), 2680 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 2681 << "dllimport"; 2682 FD->setInvalidDecl(); 2683 return FD; 2684 } else { 2685 // If a symbol previously declared dllimport is later defined, the 2686 // attribute is ignored in subsequent references, and a warning is 2687 // emitted. 2688 Diag(FD->getLocation(), 2689 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 2690 << FD->getNameAsCString() << "dllimport"; 2691 } 2692 } 2693 return FD; 2694} 2695 2696static bool StatementCreatesScope(Stmt* S) { 2697 bool result = false; 2698 if (DeclStmt* DS = dyn_cast<DeclStmt>(S)) { 2699 for (DeclStmt::decl_iterator i = DS->decl_begin(); 2700 i != DS->decl_end(); ++i) { 2701 if (VarDecl* D = dyn_cast<VarDecl>(*i)) { 2702 result |= D->getType()->isVariablyModifiedType(); 2703 result |= !!D->getAttr<CleanupAttr>(); 2704 } else if (TypedefDecl* D = dyn_cast<TypedefDecl>(*i)) { 2705 result |= D->getUnderlyingType()->isVariablyModifiedType(); 2706 } 2707 } 2708 } 2709 2710 return result; 2711} 2712 2713void Sema::RecursiveCalcLabelScopes(llvm::DenseMap<Stmt*, void*>& LabelScopeMap, 2714 llvm::DenseMap<void*, Stmt*>& PopScopeMap, 2715 std::vector<void*>& ScopeStack, 2716 Stmt* CurStmt, 2717 Stmt* ParentCompoundStmt) { 2718 for (Stmt::child_iterator i = CurStmt->child_begin(); 2719 i != CurStmt->child_end(); ++i) { 2720 if (!*i) continue; 2721 if (StatementCreatesScope(*i)) { 2722 ScopeStack.push_back(*i); 2723 PopScopeMap[*i] = ParentCompoundStmt; 2724 } else if (isa<LabelStmt>(CurStmt)) { 2725 LabelScopeMap[CurStmt] = ScopeStack.size() ? ScopeStack.back() : 0; 2726 } 2727 if (isa<DeclStmt>(*i)) continue; 2728 Stmt* CurCompound = isa<CompoundStmt>(*i) ? *i : ParentCompoundStmt; 2729 RecursiveCalcLabelScopes(LabelScopeMap, PopScopeMap, ScopeStack, 2730 *i, CurCompound); 2731 } 2732 2733 while (ScopeStack.size() && PopScopeMap[ScopeStack.back()] == CurStmt) { 2734 ScopeStack.pop_back(); 2735 } 2736} 2737 2738void Sema::RecursiveCalcJumpScopes(llvm::DenseMap<Stmt*, void*>& LabelScopeMap, 2739 llvm::DenseMap<void*, Stmt*>& PopScopeMap, 2740 llvm::DenseMap<Stmt*, void*>& GotoScopeMap, 2741 std::vector<void*>& ScopeStack, 2742 Stmt* CurStmt) { 2743 for (Stmt::child_iterator i = CurStmt->child_begin(); 2744 i != CurStmt->child_end(); ++i) { 2745 if (!*i) continue; 2746 if (StatementCreatesScope(*i)) { 2747 ScopeStack.push_back(*i); 2748 } else if (GotoStmt* GS = dyn_cast<GotoStmt>(*i)) { 2749 void* LScope = LabelScopeMap[GS->getLabel()]; 2750 if (LScope) { 2751 bool foundScopeInStack = false; 2752 for (unsigned i = ScopeStack.size(); i > 0; --i) { 2753 if (LScope == ScopeStack[i-1]) { 2754 foundScopeInStack = true; 2755 break; 2756 } 2757 } 2758 if (!foundScopeInStack) { 2759 Diag(GS->getSourceRange().getBegin(), diag::err_goto_into_scope); 2760 } 2761 } 2762 } 2763 if (isa<DeclStmt>(*i)) continue; 2764 RecursiveCalcJumpScopes(LabelScopeMap, PopScopeMap, GotoScopeMap, 2765 ScopeStack, *i); 2766 } 2767 2768 while (ScopeStack.size() && PopScopeMap[ScopeStack.back()] == CurStmt) { 2769 ScopeStack.pop_back(); 2770 } 2771} 2772 2773Sema::DeclTy *Sema::ActOnFinishFunctionBody(DeclTy *D, StmtArg BodyArg) { 2774 Decl *dcl = static_cast<Decl *>(D); 2775 Stmt *Body = static_cast<Stmt*>(BodyArg.release()); 2776 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 2777 FD->setBody(cast<CompoundStmt>(Body)); 2778 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 2779 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 2780 assert(MD == getCurMethodDecl() && "Method parsing confused"); 2781 MD->setBody(cast<CompoundStmt>(Body)); 2782 } else { 2783 Body->Destroy(Context); 2784 return 0; 2785 } 2786 PopDeclContext(); 2787 2788 // FIXME: Temporary hack to workaround nested C++ functions. For example: 2789 // class C2 { 2790 // void f() { 2791 // class LC1 { 2792 // int m() { return 1; } 2793 // }; 2794 // } 2795 // }; 2796 if (ActiveScope == 0) 2797 return D; 2798 2799 // Verify and clean out per-function state. 2800 2801 bool HaveLabels = !ActiveScope->LabelMap.empty(); 2802 // Check goto/label use. 2803 for (Scope::LabelMapTy::iterator I = ActiveScope->LabelMap.begin(), 2804 E = ActiveScope->LabelMap.end(); I != E; ++I) { 2805 // Verify that we have no forward references left. If so, there was a goto 2806 // or address of a label taken, but no definition of it. Label fwd 2807 // definitions are indicated with a null substmt. 2808 LabelStmt *L = static_cast<LabelStmt*>(I->second); 2809 if (L->getSubStmt() == 0) { 2810 // Emit error. 2811 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 2812 2813 // At this point, we have gotos that use the bogus label. Stitch it into 2814 // the function body so that they aren't leaked and that the AST is well 2815 // formed. 2816 if (Body) { 2817#if 0 2818 // FIXME: Why do this? Having a 'push_back' in CompoundStmt is ugly, 2819 // and the AST is malformed anyway. We should just blow away 'L'. 2820 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 2821 cast<CompoundStmt>(Body)->push_back(L); 2822#else 2823 L->Destroy(Context); 2824#endif 2825 } else { 2826 // The whole function wasn't parsed correctly, just delete this. 2827 L->Destroy(Context); 2828 } 2829 } 2830 } 2831 // This reset is for both functions and methods. 2832 ActiveScope = 0; 2833 2834 if (!Body) return D; 2835 2836 if (HaveLabels) { 2837 llvm::DenseMap<Stmt*, void*> LabelScopeMap; 2838 llvm::DenseMap<void*, Stmt*> PopScopeMap; 2839 llvm::DenseMap<Stmt*, void*> GotoScopeMap; 2840 std::vector<void*> ScopeStack; 2841 RecursiveCalcLabelScopes(LabelScopeMap, PopScopeMap, ScopeStack, Body, Body); 2842 RecursiveCalcJumpScopes(LabelScopeMap, PopScopeMap, GotoScopeMap, ScopeStack, Body); 2843 } 2844 2845 return D; 2846} 2847 2848/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 2849/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 2850NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 2851 IdentifierInfo &II, Scope *S) { 2852 // Before we produce a declaration for an implicitly defined 2853 // function, see whether there was a locally-scoped declaration of 2854 // this name as a function or variable. If so, use that 2855 // (non-visible) declaration, and complain about it. 2856 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2857 = LocallyScopedExternalDecls.find(&II); 2858 if (Pos != LocallyScopedExternalDecls.end()) { 2859 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 2860 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 2861 return Pos->second; 2862 } 2863 2864 // Extension in C99. Legal in C90, but warn about it. 2865 if (getLangOptions().C99) 2866 Diag(Loc, diag::ext_implicit_function_decl) << &II; 2867 else 2868 Diag(Loc, diag::warn_implicit_function_decl) << &II; 2869 2870 // FIXME: handle stuff like: 2871 // void foo() { extern float X(); } 2872 // void bar() { X(); } <-- implicit decl for X in another scope. 2873 2874 // Set a Declarator for the implicit definition: int foo(); 2875 const char *Dummy; 2876 DeclSpec DS; 2877 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 2878 Error = Error; // Silence warning. 2879 assert(!Error && "Error setting up implicit decl!"); 2880 Declarator D(DS, Declarator::BlockContext); 2881 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 2882 0, 0, 0, Loc, D), 2883 SourceLocation()); 2884 D.SetIdentifier(&II, Loc); 2885 2886 // Insert this function into translation-unit scope. 2887 2888 DeclContext *PrevDC = CurContext; 2889 CurContext = Context.getTranslationUnitDecl(); 2890 2891 FunctionDecl *FD = 2892 dyn_cast<FunctionDecl>(static_cast<Decl*>(ActOnDeclarator(TUScope, D, 0))); 2893 FD->setImplicit(); 2894 2895 CurContext = PrevDC; 2896 2897 AddKnownFunctionAttributes(FD); 2898 2899 return FD; 2900} 2901 2902/// \brief Adds any function attributes that we know a priori based on 2903/// the declaration of this function. 2904/// 2905/// These attributes can apply both to implicitly-declared builtins 2906/// (like __builtin___printf_chk) or to library-declared functions 2907/// like NSLog or printf. 2908void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 2909 if (FD->isInvalidDecl()) 2910 return; 2911 2912 // If this is a built-in function, map its builtin attributes to 2913 // actual attributes. 2914 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 2915 // Handle printf-formatting attributes. 2916 unsigned FormatIdx; 2917 bool HasVAListArg; 2918 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 2919 if (!FD->getAttr<FormatAttr>()) 2920 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 2921 FormatIdx + 2)); 2922 } 2923 2924 // Mark const if we don't care about errno and that is the only 2925 // thing preventing the function from being const. This allows 2926 // IRgen to use LLVM intrinsics for such functions. 2927 if (!getLangOptions().MathErrno && 2928 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 2929 if (!FD->getAttr<ConstAttr>()) 2930 FD->addAttr(::new (Context) ConstAttr()); 2931 } 2932 } 2933 2934 IdentifierInfo *Name = FD->getIdentifier(); 2935 if (!Name) 2936 return; 2937 if ((!getLangOptions().CPlusPlus && 2938 FD->getDeclContext()->isTranslationUnit()) || 2939 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 2940 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 2941 LinkageSpecDecl::lang_c)) { 2942 // Okay: this could be a libc/libm/Objective-C function we know 2943 // about. 2944 } else 2945 return; 2946 2947 unsigned KnownID; 2948 for (KnownID = 0; KnownID != id_num_known_functions; ++KnownID) 2949 if (KnownFunctionIDs[KnownID] == Name) 2950 break; 2951 2952 switch (KnownID) { 2953 case id_NSLog: 2954 case id_NSLogv: 2955 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 2956 // FIXME: We known better than our headers. 2957 const_cast<FormatAttr *>(Format)->setType("printf"); 2958 } else 2959 FD->addAttr(::new (Context) FormatAttr("printf", 1, 2)); 2960 break; 2961 2962 case id_asprintf: 2963 case id_vasprintf: 2964 if (!FD->getAttr<FormatAttr>()) 2965 FD->addAttr(::new (Context) FormatAttr("printf", 2, 3)); 2966 break; 2967 2968 default: 2969 // Unknown function or known function without any attributes to 2970 // add. Do nothing. 2971 break; 2972 } 2973} 2974 2975TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 2976 Decl *LastDeclarator) { 2977 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 2978 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 2979 2980 // Scope manipulation handled by caller. 2981 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 2982 D.getIdentifierLoc(), 2983 D.getIdentifier(), 2984 T); 2985 2986 if (TagType *TT = dyn_cast<TagType>(T)) { 2987 TagDecl *TD = TT->getDecl(); 2988 2989 // If the TagDecl that the TypedefDecl points to is an anonymous decl 2990 // keep track of the TypedefDecl. 2991 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 2992 TD->setTypedefForAnonDecl(NewTD); 2993 } 2994 2995 NewTD->setNextDeclarator(LastDeclarator); 2996 if (D.getInvalidType()) 2997 NewTD->setInvalidDecl(); 2998 return NewTD; 2999} 3000 3001/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 3002/// former case, Name will be non-null. In the later case, Name will be null. 3003/// TagSpec indicates what kind of tag this is. TK indicates whether this is a 3004/// reference/declaration/definition of a tag. 3005Sema::DeclTy *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, 3006 SourceLocation KWLoc, const CXXScopeSpec &SS, 3007 IdentifierInfo *Name, SourceLocation NameLoc, 3008 AttributeList *Attr) { 3009 // If this is not a definition, it must have a name. 3010 assert((Name != 0 || TK == TK_Definition) && 3011 "Nameless record must be a definition!"); 3012 3013 TagDecl::TagKind Kind; 3014 switch (TagSpec) { 3015 default: assert(0 && "Unknown tag type!"); 3016 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 3017 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 3018 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 3019 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 3020 } 3021 3022 DeclContext *SearchDC = CurContext; 3023 DeclContext *DC = CurContext; 3024 NamedDecl *PrevDecl = 0; 3025 3026 bool Invalid = false; 3027 3028 if (Name && SS.isNotEmpty()) { 3029 // We have a nested-name tag ('struct foo::bar'). 3030 3031 // Check for invalid 'foo::'. 3032 if (SS.isInvalid()) { 3033 Name = 0; 3034 goto CreateNewDecl; 3035 } 3036 3037 // FIXME: RequireCompleteDeclContext(SS)? 3038 DC = static_cast<DeclContext*>(SS.getScopeRep()); 3039 SearchDC = DC; 3040 // Look-up name inside 'foo::'. 3041 PrevDecl = dyn_cast_or_null<TagDecl>( 3042 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 3043 3044 // A tag 'foo::bar' must already exist. 3045 if (PrevDecl == 0) { 3046 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 3047 Name = 0; 3048 goto CreateNewDecl; 3049 } 3050 } else if (Name) { 3051 // If this is a named struct, check to see if there was a previous forward 3052 // declaration or definition. 3053 // FIXME: We're looking into outer scopes here, even when we 3054 // shouldn't be. Doing so can result in ambiguities that we 3055 // shouldn't be diagnosing. 3056 LookupResult R = LookupName(S, Name, LookupTagName, 3057 /*RedeclarationOnly=*/(TK != TK_Reference)); 3058 if (R.isAmbiguous()) { 3059 DiagnoseAmbiguousLookup(R, Name, NameLoc); 3060 // FIXME: This is not best way to recover from case like: 3061 // 3062 // struct S s; 3063 // 3064 // causes needless err_ovl_no_viable_function_in_init latter. 3065 Name = 0; 3066 PrevDecl = 0; 3067 Invalid = true; 3068 } 3069 else 3070 PrevDecl = R; 3071 3072 if (!getLangOptions().CPlusPlus && TK != TK_Reference) { 3073 // FIXME: This makes sure that we ignore the contexts associated 3074 // with C structs, unions, and enums when looking for a matching 3075 // tag declaration or definition. See the similar lookup tweak 3076 // in Sema::LookupName; is there a better way to deal with this? 3077 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 3078 SearchDC = SearchDC->getParent(); 3079 } 3080 } 3081 3082 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3083 // Maybe we will complain about the shadowed template parameter. 3084 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 3085 // Just pretend that we didn't see the previous declaration. 3086 PrevDecl = 0; 3087 } 3088 3089 if (PrevDecl) { 3090 // Check whether the previous declaration is usable. 3091 (void)DiagnoseUseOfDecl(PrevDecl, NameLoc); 3092 3093 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 3094 // If this is a use of a previous tag, or if the tag is already declared 3095 // in the same scope (so that the definition/declaration completes or 3096 // rementions the tag), reuse the decl. 3097 if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { 3098 // Make sure that this wasn't declared as an enum and now used as a 3099 // struct or something similar. 3100 if (PrevTagDecl->getTagKind() != Kind) { 3101 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 3102 Diag(PrevDecl->getLocation(), diag::note_previous_use); 3103 // Recover by making this an anonymous redefinition. 3104 Name = 0; 3105 PrevDecl = 0; 3106 Invalid = true; 3107 } else { 3108 // If this is a use, just return the declaration we found. 3109 3110 // FIXME: In the future, return a variant or some other clue 3111 // for the consumer of this Decl to know it doesn't own it. 3112 // For our current ASTs this shouldn't be a problem, but will 3113 // need to be changed with DeclGroups. 3114 if (TK == TK_Reference) 3115 return PrevDecl; 3116 3117 // Diagnose attempts to redefine a tag. 3118 if (TK == TK_Definition) { 3119 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 3120 Diag(NameLoc, diag::err_redefinition) << Name; 3121 Diag(Def->getLocation(), diag::note_previous_definition); 3122 // If this is a redefinition, recover by making this 3123 // struct be anonymous, which will make any later 3124 // references get the previous definition. 3125 Name = 0; 3126 PrevDecl = 0; 3127 Invalid = true; 3128 } else { 3129 // If the type is currently being defined, complain 3130 // about a nested redefinition. 3131 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 3132 if (Tag->isBeingDefined()) { 3133 Diag(NameLoc, diag::err_nested_redefinition) << Name; 3134 Diag(PrevTagDecl->getLocation(), 3135 diag::note_previous_definition); 3136 Name = 0; 3137 PrevDecl = 0; 3138 Invalid = true; 3139 } 3140 } 3141 3142 // Okay, this is definition of a previously declared or referenced 3143 // tag PrevDecl. We're going to create a new Decl for it. 3144 } 3145 } 3146 // If we get here we have (another) forward declaration or we 3147 // have a definition. Just create a new decl. 3148 } else { 3149 // If we get here, this is a definition of a new tag type in a nested 3150 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 3151 // new decl/type. We set PrevDecl to NULL so that the entities 3152 // have distinct types. 3153 PrevDecl = 0; 3154 } 3155 // If we get here, we're going to create a new Decl. If PrevDecl 3156 // is non-NULL, it's a definition of the tag declared by 3157 // PrevDecl. If it's NULL, we have a new definition. 3158 } else { 3159 // PrevDecl is a namespace, template, or anything else 3160 // that lives in the IDNS_Tag identifier namespace. 3161 if (isDeclInScope(PrevDecl, SearchDC, S)) { 3162 // The tag name clashes with a namespace name, issue an error and 3163 // recover by making this tag be anonymous. 3164 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 3165 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3166 Name = 0; 3167 PrevDecl = 0; 3168 Invalid = true; 3169 } else { 3170 // The existing declaration isn't relevant to us; we're in a 3171 // new scope, so clear out the previous declaration. 3172 PrevDecl = 0; 3173 } 3174 } 3175 } else if (TK == TK_Reference && SS.isEmpty() && Name && 3176 (Kind != TagDecl::TK_enum || !getLangOptions().CPlusPlus)) { 3177 // C.scope.pdecl]p5: 3178 // -- for an elaborated-type-specifier of the form 3179 // 3180 // class-key identifier 3181 // 3182 // if the elaborated-type-specifier is used in the 3183 // decl-specifier-seq or parameter-declaration-clause of a 3184 // function defined in namespace scope, the identifier is 3185 // declared as a class-name in the namespace that contains 3186 // the declaration; otherwise, except as a friend 3187 // declaration, the identifier is declared in the smallest 3188 // non-class, non-function-prototype scope that contains the 3189 // declaration. 3190 // 3191 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 3192 // C structs and unions. 3193 // 3194 // GNU C also supports this behavior as part of its incomplete 3195 // enum types extension, while GNU C++ does not. 3196 // 3197 // Find the context where we'll be declaring the tag. 3198 // FIXME: We would like to maintain the current DeclContext as the 3199 // lexical context, 3200 while (SearchDC->isRecord()) 3201 SearchDC = SearchDC->getParent(); 3202 3203 // Find the scope where we'll be declaring the tag. 3204 while (S->isClassScope() || 3205 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 3206 ((S->getFlags() & Scope::DeclScope) == 0) || 3207 (S->getEntity() && 3208 ((DeclContext *)S->getEntity())->isTransparentContext())) 3209 S = S->getParent(); 3210 } 3211 3212CreateNewDecl: 3213 3214 // If there is an identifier, use the location of the identifier as the 3215 // location of the decl, otherwise use the location of the struct/union 3216 // keyword. 3217 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 3218 3219 // Otherwise, create a new declaration. If there is a previous 3220 // declaration of the same entity, the two will be linked via 3221 // PrevDecl. 3222 TagDecl *New; 3223 3224 if (Kind == TagDecl::TK_enum) { 3225 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3226 // enum X { A, B, C } D; D should chain to X. 3227 New = EnumDecl::Create(Context, SearchDC, Loc, Name, 3228 cast_or_null<EnumDecl>(PrevDecl)); 3229 // If this is an undefined enum, warn. 3230 if (TK != TK_Definition && !Invalid) { 3231 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 3232 : diag::ext_forward_ref_enum; 3233 Diag(Loc, DK); 3234 } 3235 } else { 3236 // struct/union/class 3237 3238 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3239 // struct X { int A; } D; D should chain to X. 3240 if (getLangOptions().CPlusPlus) 3241 // FIXME: Look for a way to use RecordDecl for simple structs. 3242 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3243 cast_or_null<CXXRecordDecl>(PrevDecl)); 3244 else 3245 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3246 cast_or_null<RecordDecl>(PrevDecl)); 3247 } 3248 3249 if (Kind != TagDecl::TK_enum) { 3250 // Handle #pragma pack: if the #pragma pack stack has non-default 3251 // alignment, make up a packed attribute for this decl. These 3252 // attributes are checked when the ASTContext lays out the 3253 // structure. 3254 // 3255 // It is important for implementing the correct semantics that this 3256 // happen here (in act on tag decl). The #pragma pack stack is 3257 // maintained as a result of parser callbacks which can occur at 3258 // many points during the parsing of a struct declaration (because 3259 // the #pragma tokens are effectively skipped over during the 3260 // parsing of the struct). 3261 if (unsigned Alignment = getPragmaPackAlignment()) 3262 New->addAttr(::new (Context) PackedAttr(Alignment * 8)); 3263 } 3264 3265 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 3266 // C++ [dcl.typedef]p3: 3267 // [...] Similarly, in a given scope, a class or enumeration 3268 // shall not be declared with the same name as a typedef-name 3269 // that is declared in that scope and refers to a type other 3270 // than the class or enumeration itself. 3271 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 3272 TypedefDecl *PrevTypedef = 0; 3273 if (Lookup.getKind() == LookupResult::Found) 3274 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 3275 3276 if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && 3277 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 3278 Context.getCanonicalType(Context.getTypeDeclType(New))) { 3279 Diag(Loc, diag::err_tag_definition_of_typedef) 3280 << Context.getTypeDeclType(New) 3281 << PrevTypedef->getUnderlyingType(); 3282 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 3283 Invalid = true; 3284 } 3285 } 3286 3287 if (Invalid) 3288 New->setInvalidDecl(); 3289 3290 if (Attr) 3291 ProcessDeclAttributeList(New, Attr); 3292 3293 // If we're declaring or defining a tag in function prototype scope 3294 // in C, note that this type can only be used within the function. 3295 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 3296 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 3297 3298 // Set the lexical context. If the tag has a C++ scope specifier, the 3299 // lexical context will be different from the semantic context. 3300 New->setLexicalDeclContext(CurContext); 3301 3302 if (TK == TK_Definition) 3303 New->startDefinition(); 3304 3305 // If this has an identifier, add it to the scope stack. 3306 if (Name) { 3307 S = getNonFieldDeclScope(S); 3308 PushOnScopeChains(New, S); 3309 } else { 3310 CurContext->addDecl(New); 3311 } 3312 3313 return New; 3314} 3315 3316void Sema::ActOnTagStartDefinition(Scope *S, DeclTy *TagD) { 3317 AdjustDeclIfTemplate(TagD); 3318 TagDecl *Tag = cast<TagDecl>((Decl *)TagD); 3319 3320 // Enter the tag context. 3321 PushDeclContext(S, Tag); 3322 3323 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 3324 FieldCollector->StartClass(); 3325 3326 if (Record->getIdentifier()) { 3327 // C++ [class]p2: 3328 // [...] The class-name is also inserted into the scope of the 3329 // class itself; this is known as the injected-class-name. For 3330 // purposes of access checking, the injected-class-name is treated 3331 // as if it were a public member name. 3332 RecordDecl *InjectedClassName 3333 = CXXRecordDecl::Create(Context, Record->getTagKind(), 3334 CurContext, Record->getLocation(), 3335 Record->getIdentifier(), Record); 3336 InjectedClassName->setImplicit(); 3337 PushOnScopeChains(InjectedClassName, S); 3338 } 3339 } 3340} 3341 3342void Sema::ActOnTagFinishDefinition(Scope *S, DeclTy *TagD) { 3343 AdjustDeclIfTemplate(TagD); 3344 TagDecl *Tag = cast<TagDecl>((Decl *)TagD); 3345 3346 if (isa<CXXRecordDecl>(Tag)) 3347 FieldCollector->FinishClass(); 3348 3349 // Exit this scope of this tag's definition. 3350 PopDeclContext(); 3351 3352 // Notify the consumer that we've defined a tag. 3353 Consumer.HandleTagDeclDefinition(Tag); 3354} 3355 3356bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 3357 QualType FieldTy, const Expr *BitWidth) { 3358 // C99 6.7.2.1p4 - verify the field type. 3359 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 3360 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 3361 // Handle incomplete types with specific error. 3362 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 3363 return true; 3364 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 3365 << FieldName << FieldTy << BitWidth->getSourceRange(); 3366 } 3367 3368 // If the bit-width is type- or value-dependent, don't try to check 3369 // it now. 3370 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 3371 return false; 3372 3373 llvm::APSInt Value; 3374 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 3375 return true; 3376 3377 // Zero-width bitfield is ok for anonymous field. 3378 if (Value == 0 && FieldName) 3379 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 3380 3381 if (Value.isNegative()) 3382 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) << FieldName; 3383 3384 if (!FieldTy->isDependentType()) { 3385 uint64_t TypeSize = Context.getTypeSize(FieldTy); 3386 // FIXME: We won't need the 0 size once we check that the field type is valid. 3387 if (TypeSize && Value.getZExtValue() > TypeSize) 3388 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 3389 << FieldName << (unsigned)TypeSize; 3390 } 3391 3392 return false; 3393} 3394 3395/// ActOnField - Each field of a struct/union/class is passed into this in order 3396/// to create a FieldDecl object for it. 3397Sema::DeclTy *Sema::ActOnField(Scope *S, DeclTy *TagD, 3398 SourceLocation DeclStart, 3399 Declarator &D, ExprTy *BitfieldWidth) { 3400 3401 return HandleField(S, static_cast<RecordDecl*>(TagD), DeclStart, D, 3402 static_cast<Expr*>(BitfieldWidth), 3403 AS_public); 3404} 3405 3406/// HandleField - Analyze a field of a C struct or a C++ data member. 3407/// 3408FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 3409 SourceLocation DeclStart, 3410 Declarator &D, Expr *BitWidth, 3411 AccessSpecifier AS) { 3412 IdentifierInfo *II = D.getIdentifier(); 3413 SourceLocation Loc = DeclStart; 3414 if (II) Loc = D.getIdentifierLoc(); 3415 3416 QualType T = GetTypeForDeclarator(D, S); 3417 3418 if (getLangOptions().CPlusPlus) { 3419 CheckExtraCXXDefaultArguments(D); 3420 3421 if (D.getDeclSpec().isVirtualSpecified()) 3422 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3423 diag::err_virtual_non_function); 3424 } 3425 3426 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3427 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 3428 PrevDecl = 0; 3429 3430 FieldDecl *NewFD 3431 = CheckFieldDecl(II, T, Record, Loc, 3432 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable, 3433 BitWidth, AS, PrevDecl, &D); 3434 if (NewFD->isInvalidDecl() && PrevDecl) { 3435 // Don't introduce NewFD into scope; there's already something 3436 // with the same name in the same scope. 3437 } else if (II) { 3438 PushOnScopeChains(NewFD, S); 3439 } else 3440 Record->addDecl(NewFD); 3441 3442 return NewFD; 3443} 3444 3445/// \brief Build a new FieldDecl and check its well-formedness. 3446/// 3447/// This routine builds a new FieldDecl given the fields name, type, 3448/// record, etc. \p PrevDecl should refer to any previous declaration 3449/// with the same name and in the same scope as the field to be 3450/// created. 3451/// 3452/// \returns a new FieldDecl. 3453/// 3454/// \todo The Declarator argument is a hack. It will be removed once 3455FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 3456 RecordDecl *Record, SourceLocation Loc, 3457 bool Mutable, Expr *BitWidth, 3458 AccessSpecifier AS, NamedDecl *PrevDecl, 3459 Declarator *D) { 3460 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3461 bool InvalidDecl = false; 3462 3463 // If we receive a broken type, recover by assuming 'int' and 3464 // marking this declaration as invalid. 3465 if (T.isNull()) { 3466 InvalidDecl = true; 3467 T = Context.IntTy; 3468 } 3469 3470 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3471 // than a variably modified type. 3472 if (T->isVariablyModifiedType()) { 3473 bool SizeIsNegative; 3474 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 3475 SizeIsNegative); 3476 if (!FixedTy.isNull()) { 3477 Diag(Loc, diag::warn_illegal_constant_array_size); 3478 T = FixedTy; 3479 } else { 3480 if (SizeIsNegative) 3481 Diag(Loc, diag::err_typecheck_negative_array_size); 3482 else 3483 Diag(Loc, diag::err_typecheck_field_variable_size); 3484 T = Context.IntTy; 3485 InvalidDecl = true; 3486 } 3487 } 3488 3489 // If this is declared as a bit-field, check the bit-field. 3490 if (BitWidth && VerifyBitField(Loc, II, T, BitWidth)) { 3491 InvalidDecl = true; 3492 DeleteExpr(BitWidth); 3493 BitWidth = 0; 3494 } 3495 3496 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, BitWidth, 3497 Mutable); 3498 3499 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 3500 Diag(Loc, diag::err_duplicate_member) << II; 3501 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3502 NewFD->setInvalidDecl(); 3503 Record->setInvalidDecl(); 3504 } 3505 3506 if (getLangOptions().CPlusPlus && !T->isPODType()) 3507 cast<CXXRecordDecl>(Record)->setPOD(false); 3508 3509 // FIXME: We need to pass in the attributes given an AST 3510 // representation, not a parser representation. 3511 if (D) 3512 ProcessDeclAttributes(NewFD, *D); 3513 3514 if (T.isObjCGCWeak()) 3515 Diag(Loc, diag::warn_attribute_weak_on_field); 3516 3517 if (InvalidDecl) 3518 NewFD->setInvalidDecl(); 3519 3520 NewFD->setAccess(AS); 3521 3522 // C++ [dcl.init.aggr]p1: 3523 // An aggregate is an array or a class (clause 9) with [...] no 3524 // private or protected non-static data members (clause 11). 3525 // A POD must be an aggregate. 3526 if (getLangOptions().CPlusPlus && 3527 (AS == AS_private || AS == AS_protected)) { 3528 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 3529 CXXRecord->setAggregate(false); 3530 CXXRecord->setPOD(false); 3531 } 3532 3533 return NewFD; 3534} 3535 3536/// TranslateIvarVisibility - Translate visibility from a token ID to an 3537/// AST enum value. 3538static ObjCIvarDecl::AccessControl 3539TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 3540 switch (ivarVisibility) { 3541 default: assert(0 && "Unknown visitibility kind"); 3542 case tok::objc_private: return ObjCIvarDecl::Private; 3543 case tok::objc_public: return ObjCIvarDecl::Public; 3544 case tok::objc_protected: return ObjCIvarDecl::Protected; 3545 case tok::objc_package: return ObjCIvarDecl::Package; 3546 } 3547} 3548 3549/// ActOnIvar - Each ivar field of an objective-c class is passed into this 3550/// in order to create an IvarDecl object for it. 3551Sema::DeclTy *Sema::ActOnIvar(Scope *S, 3552 SourceLocation DeclStart, 3553 Declarator &D, ExprTy *BitfieldWidth, 3554 tok::ObjCKeywordKind Visibility) { 3555 3556 IdentifierInfo *II = D.getIdentifier(); 3557 Expr *BitWidth = (Expr*)BitfieldWidth; 3558 SourceLocation Loc = DeclStart; 3559 if (II) Loc = D.getIdentifierLoc(); 3560 3561 // FIXME: Unnamed fields can be handled in various different ways, for 3562 // example, unnamed unions inject all members into the struct namespace! 3563 3564 QualType T = GetTypeForDeclarator(D, S); 3565 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3566 bool InvalidDecl = false; 3567 3568 if (BitWidth) { 3569 // 6.7.2.1p3, 6.7.2.1p4 3570 if (VerifyBitField(Loc, II, T, BitWidth)) { 3571 InvalidDecl = true; 3572 DeleteExpr(BitWidth); 3573 BitWidth = 0; 3574 } 3575 } else { 3576 // Not a bitfield. 3577 3578 // validate II. 3579 3580 } 3581 3582 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3583 // than a variably modified type. 3584 if (T->isVariablyModifiedType()) { 3585 Diag(Loc, diag::err_typecheck_ivar_variable_size); 3586 InvalidDecl = true; 3587 } 3588 3589 // Get the visibility (access control) for this ivar. 3590 ObjCIvarDecl::AccessControl ac = 3591 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 3592 : ObjCIvarDecl::None; 3593 3594 // Construct the decl. 3595 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, CurContext, Loc, II, T,ac, 3596 (Expr *)BitfieldWidth); 3597 3598 if (II) { 3599 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3600 if (PrevDecl && isDeclInScope(PrevDecl, CurContext, S) 3601 && !isa<TagDecl>(PrevDecl)) { 3602 Diag(Loc, diag::err_duplicate_member) << II; 3603 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3604 NewID->setInvalidDecl(); 3605 } 3606 } 3607 3608 // Process attributes attached to the ivar. 3609 ProcessDeclAttributes(NewID, D); 3610 3611 if (D.getInvalidType() || InvalidDecl) 3612 NewID->setInvalidDecl(); 3613 3614 if (II) { 3615 // FIXME: When interfaces are DeclContexts, we'll need to add 3616 // these to the interface. 3617 S->AddDecl(NewID); 3618 IdResolver.AddDecl(NewID); 3619 } 3620 3621 return NewID; 3622} 3623 3624void Sema::ActOnFields(Scope* S, 3625 SourceLocation RecLoc, DeclTy *RecDecl, 3626 DeclTy **Fields, unsigned NumFields, 3627 SourceLocation LBrac, SourceLocation RBrac, 3628 AttributeList *Attr) { 3629 Decl *EnclosingDecl = static_cast<Decl*>(RecDecl); 3630 assert(EnclosingDecl && "missing record or interface decl"); 3631 3632 // If the decl this is being inserted into is invalid, then it may be a 3633 // redeclaration or some other bogus case. Don't try to add fields to it. 3634 if (EnclosingDecl->isInvalidDecl()) { 3635 // FIXME: Deallocate fields? 3636 return; 3637 } 3638 3639 3640 // Verify that all the fields are okay. 3641 unsigned NumNamedMembers = 0; 3642 llvm::SmallVector<FieldDecl*, 32> RecFields; 3643 3644 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 3645 for (unsigned i = 0; i != NumFields; ++i) { 3646 FieldDecl *FD = cast_or_null<FieldDecl>(static_cast<Decl*>(Fields[i])); 3647 assert(FD && "missing field decl"); 3648 3649 // Get the type for the field. 3650 Type *FDTy = FD->getType().getTypePtr(); 3651 3652 if (!FD->isAnonymousStructOrUnion()) { 3653 // Remember all fields written by the user. 3654 RecFields.push_back(FD); 3655 } 3656 3657 // If the field is already invalid for some reason, don't emit more 3658 // diagnostics about it. 3659 if (FD->isInvalidDecl()) 3660 continue; 3661 3662 // C99 6.7.2.1p2 - A field may not be a function type. 3663 if (FDTy->isFunctionType()) { 3664 Diag(FD->getLocation(), diag::err_field_declared_as_function) 3665 << FD->getDeclName(); 3666 FD->setInvalidDecl(); 3667 EnclosingDecl->setInvalidDecl(); 3668 continue; 3669 } 3670 // C99 6.7.2.1p2 - A field may not be an incomplete type except... 3671 if (FDTy->isIncompleteType()) { 3672 if (!Record) { // Incomplete ivar type is always an error. 3673 RequireCompleteType(FD->getLocation(), FD->getType(), 3674 diag::err_field_incomplete); 3675 FD->setInvalidDecl(); 3676 EnclosingDecl->setInvalidDecl(); 3677 continue; 3678 } 3679 if (i != NumFields-1 || // ... that the last member ... 3680 !Record->isStruct() || // ... of a structure ... 3681 !FDTy->isArrayType()) { //... may have incomplete array type. 3682 RequireCompleteType(FD->getLocation(), FD->getType(), 3683 diag::err_field_incomplete); 3684 FD->setInvalidDecl(); 3685 EnclosingDecl->setInvalidDecl(); 3686 continue; 3687 } 3688 if (NumNamedMembers < 1) { //... must have more than named member ... 3689 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 3690 << FD->getDeclName(); 3691 FD->setInvalidDecl(); 3692 EnclosingDecl->setInvalidDecl(); 3693 continue; 3694 } 3695 // Okay, we have a legal flexible array member at the end of the struct. 3696 if (Record) 3697 Record->setHasFlexibleArrayMember(true); 3698 } 3699 /// C99 6.7.2.1p2 - a struct ending in a flexible array member cannot be the 3700 /// field of another structure or the element of an array. 3701 if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 3702 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 3703 // If this is a member of a union, then entire union becomes "flexible". 3704 if (Record && Record->isUnion()) { 3705 Record->setHasFlexibleArrayMember(true); 3706 } else { 3707 // If this is a struct/class and this is not the last element, reject 3708 // it. Note that GCC supports variable sized arrays in the middle of 3709 // structures. 3710 if (i != NumFields-1) 3711 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 3712 << FD->getDeclName(); 3713 else { 3714 // We support flexible arrays at the end of structs in 3715 // other structs as an extension. 3716 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 3717 << FD->getDeclName(); 3718 if (Record) 3719 Record->setHasFlexibleArrayMember(true); 3720 } 3721 } 3722 } 3723 } 3724 /// A field cannot be an Objective-c object 3725 if (FDTy->isObjCInterfaceType()) { 3726 Diag(FD->getLocation(), diag::err_statically_allocated_object); 3727 FD->setInvalidDecl(); 3728 EnclosingDecl->setInvalidDecl(); 3729 continue; 3730 } 3731 // Keep track of the number of named members. 3732 if (FD->getIdentifier()) 3733 ++NumNamedMembers; 3734 } 3735 3736 // Okay, we successfully defined 'Record'. 3737 if (Record) { 3738 Record->completeDefinition(Context); 3739 } else { 3740 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 3741 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 3742 ID->setIVarList(ClsFields, RecFields.size(), Context); 3743 ID->setLocEnd(RBrac); 3744 3745 // Must enforce the rule that ivars in the base classes may not be 3746 // duplicates. 3747 if (ID->getSuperClass()) { 3748 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 3749 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 3750 ObjCIvarDecl* Ivar = (*IVI); 3751 IdentifierInfo *II = Ivar->getIdentifier(); 3752 ObjCIvarDecl* prevIvar = 3753 ID->getSuperClass()->lookupInstanceVariable(II); 3754 if (prevIvar) { 3755 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 3756 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 3757 } 3758 } 3759 } 3760 } else if (ObjCImplementationDecl *IMPDecl = 3761 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 3762 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 3763 IMPDecl->setIVarList(ClsFields, RecFields.size(), Context); 3764 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 3765 } 3766 } 3767 3768 if (Attr) 3769 ProcessDeclAttributeList(Record, Attr); 3770} 3771 3772Sema::DeclTy *Sema::ActOnEnumConstant(Scope *S, DeclTy *theEnumDecl, 3773 DeclTy *lastEnumConst, 3774 SourceLocation IdLoc, IdentifierInfo *Id, 3775 SourceLocation EqualLoc, ExprTy *val) { 3776 EnumDecl *TheEnumDecl = cast<EnumDecl>(static_cast<Decl*>(theEnumDecl)); 3777 EnumConstantDecl *LastEnumConst = 3778 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(lastEnumConst)); 3779 Expr *Val = static_cast<Expr*>(val); 3780 3781 // The scope passed in may not be a decl scope. Zip up the scope tree until 3782 // we find one that is. 3783 S = getNonFieldDeclScope(S); 3784 3785 // Verify that there isn't already something declared with this name in this 3786 // scope. 3787 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 3788 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3789 // Maybe we will complain about the shadowed template parameter. 3790 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 3791 // Just pretend that we didn't see the previous declaration. 3792 PrevDecl = 0; 3793 } 3794 3795 if (PrevDecl) { 3796 // When in C++, we may get a TagDecl with the same name; in this case the 3797 // enum constant will 'hide' the tag. 3798 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 3799 "Received TagDecl when not in C++!"); 3800 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 3801 if (isa<EnumConstantDecl>(PrevDecl)) 3802 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 3803 else 3804 Diag(IdLoc, diag::err_redefinition) << Id; 3805 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3806 if (Val) Val->Destroy(Context); 3807 return 0; 3808 } 3809 } 3810 3811 llvm::APSInt EnumVal(32); 3812 QualType EltTy; 3813 if (Val) { 3814 // Make sure to promote the operand type to int. 3815 UsualUnaryConversions(Val); 3816 3817 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 3818 SourceLocation ExpLoc; 3819 if (VerifyIntegerConstantExpression(Val, &EnumVal)) { 3820 Val->Destroy(Context); 3821 Val = 0; // Just forget about it. 3822 } else { 3823 EltTy = Val->getType(); 3824 } 3825 } 3826 3827 if (!Val) { 3828 if (LastEnumConst) { 3829 // Assign the last value + 1. 3830 EnumVal = LastEnumConst->getInitVal(); 3831 ++EnumVal; 3832 3833 // Check for overflow on increment. 3834 if (EnumVal < LastEnumConst->getInitVal()) 3835 Diag(IdLoc, diag::warn_enum_value_overflow); 3836 3837 EltTy = LastEnumConst->getType(); 3838 } else { 3839 // First value, set to zero. 3840 EltTy = Context.IntTy; 3841 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 3842 } 3843 } 3844 3845 EnumConstantDecl *New = 3846 EnumConstantDecl::Create(Context, TheEnumDecl, IdLoc, Id, EltTy, 3847 Val, EnumVal); 3848 3849 // Register this decl in the current scope stack. 3850 PushOnScopeChains(New, S); 3851 3852 return New; 3853} 3854 3855// FIXME: For consistency with ActOnFields(), we should have the parser 3856// pass in the source location for the left/right braces. 3857void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclTy *EnumDeclX, 3858 DeclTy **Elements, unsigned NumElements) { 3859 EnumDecl *Enum = cast<EnumDecl>(static_cast<Decl*>(EnumDeclX)); 3860 QualType EnumType = Context.getTypeDeclType(Enum); 3861 3862 // TODO: If the result value doesn't fit in an int, it must be a long or long 3863 // long value. ISO C does not support this, but GCC does as an extension, 3864 // emit a warning. 3865 unsigned IntWidth = Context.Target.getIntWidth(); 3866 3867 // Verify that all the values are okay, compute the size of the values, and 3868 // reverse the list. 3869 unsigned NumNegativeBits = 0; 3870 unsigned NumPositiveBits = 0; 3871 3872 // Keep track of whether all elements have type int. 3873 bool AllElementsInt = true; 3874 3875 for (unsigned i = 0; i != NumElements; ++i) { 3876 EnumConstantDecl *ECD = 3877 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3878 if (!ECD) continue; // Already issued a diagnostic. 3879 3880 // If the enum value doesn't fit in an int, emit an extension warning. 3881 const llvm::APSInt &InitVal = ECD->getInitVal(); 3882 assert(InitVal.getBitWidth() >= IntWidth && 3883 "Should have promoted value to int"); 3884 if (InitVal.getBitWidth() > IntWidth) { 3885 llvm::APSInt V(InitVal); 3886 V.trunc(IntWidth); 3887 V.extend(InitVal.getBitWidth()); 3888 if (V != InitVal) 3889 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 3890 << InitVal.toString(10); 3891 } 3892 3893 // Keep track of the size of positive and negative values. 3894 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 3895 NumPositiveBits = std::max(NumPositiveBits, 3896 (unsigned)InitVal.getActiveBits()); 3897 else 3898 NumNegativeBits = std::max(NumNegativeBits, 3899 (unsigned)InitVal.getMinSignedBits()); 3900 3901 // Keep track of whether every enum element has type int (very commmon). 3902 if (AllElementsInt) 3903 AllElementsInt = ECD->getType() == Context.IntTy; 3904 } 3905 3906 // Figure out the type that should be used for this enum. 3907 // FIXME: Support attribute(packed) on enums and -fshort-enums. 3908 QualType BestType; 3909 unsigned BestWidth; 3910 3911 if (NumNegativeBits) { 3912 // If there is a negative value, figure out the smallest integer type (of 3913 // int/long/longlong) that fits. 3914 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 3915 BestType = Context.IntTy; 3916 BestWidth = IntWidth; 3917 } else { 3918 BestWidth = Context.Target.getLongWidth(); 3919 3920 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 3921 BestType = Context.LongTy; 3922 else { 3923 BestWidth = Context.Target.getLongLongWidth(); 3924 3925 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 3926 Diag(Enum->getLocation(), diag::warn_enum_too_large); 3927 BestType = Context.LongLongTy; 3928 } 3929 } 3930 } else { 3931 // If there is no negative value, figure out which of uint, ulong, ulonglong 3932 // fits. 3933 if (NumPositiveBits <= IntWidth) { 3934 BestType = Context.UnsignedIntTy; 3935 BestWidth = IntWidth; 3936 } else if (NumPositiveBits <= 3937 (BestWidth = Context.Target.getLongWidth())) { 3938 BestType = Context.UnsignedLongTy; 3939 } else { 3940 BestWidth = Context.Target.getLongLongWidth(); 3941 assert(NumPositiveBits <= BestWidth && 3942 "How could an initializer get larger than ULL?"); 3943 BestType = Context.UnsignedLongLongTy; 3944 } 3945 } 3946 3947 // Loop over all of the enumerator constants, changing their types to match 3948 // the type of the enum if needed. 3949 for (unsigned i = 0; i != NumElements; ++i) { 3950 EnumConstantDecl *ECD = 3951 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3952 if (!ECD) continue; // Already issued a diagnostic. 3953 3954 // Standard C says the enumerators have int type, but we allow, as an 3955 // extension, the enumerators to be larger than int size. If each 3956 // enumerator value fits in an int, type it as an int, otherwise type it the 3957 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 3958 // that X has type 'int', not 'unsigned'. 3959 if (ECD->getType() == Context.IntTy) { 3960 // Make sure the init value is signed. 3961 llvm::APSInt IV = ECD->getInitVal(); 3962 IV.setIsSigned(true); 3963 ECD->setInitVal(IV); 3964 3965 if (getLangOptions().CPlusPlus) 3966 // C++ [dcl.enum]p4: Following the closing brace of an 3967 // enum-specifier, each enumerator has the type of its 3968 // enumeration. 3969 ECD->setType(EnumType); 3970 continue; // Already int type. 3971 } 3972 3973 // Determine whether the value fits into an int. 3974 llvm::APSInt InitVal = ECD->getInitVal(); 3975 bool FitsInInt; 3976 if (InitVal.isUnsigned() || !InitVal.isNegative()) 3977 FitsInInt = InitVal.getActiveBits() < IntWidth; 3978 else 3979 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 3980 3981 // If it fits into an integer type, force it. Otherwise force it to match 3982 // the enum decl type. 3983 QualType NewTy; 3984 unsigned NewWidth; 3985 bool NewSign; 3986 if (FitsInInt) { 3987 NewTy = Context.IntTy; 3988 NewWidth = IntWidth; 3989 NewSign = true; 3990 } else if (ECD->getType() == BestType) { 3991 // Already the right type! 3992 if (getLangOptions().CPlusPlus) 3993 // C++ [dcl.enum]p4: Following the closing brace of an 3994 // enum-specifier, each enumerator has the type of its 3995 // enumeration. 3996 ECD->setType(EnumType); 3997 continue; 3998 } else { 3999 NewTy = BestType; 4000 NewWidth = BestWidth; 4001 NewSign = BestType->isSignedIntegerType(); 4002 } 4003 4004 // Adjust the APSInt value. 4005 InitVal.extOrTrunc(NewWidth); 4006 InitVal.setIsSigned(NewSign); 4007 ECD->setInitVal(InitVal); 4008 4009 // Adjust the Expr initializer and type. 4010 if (ECD->getInitExpr()) 4011 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), 4012 /*isLvalue=*/false)); 4013 if (getLangOptions().CPlusPlus) 4014 // C++ [dcl.enum]p4: Following the closing brace of an 4015 // enum-specifier, each enumerator has the type of its 4016 // enumeration. 4017 ECD->setType(EnumType); 4018 else 4019 ECD->setType(NewTy); 4020 } 4021 4022 Enum->completeDefinition(Context, BestType); 4023} 4024 4025Sema::DeclTy *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 4026 ExprArg expr) { 4027 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr.release()); 4028 4029 return FileScopeAsmDecl::Create(Context, CurContext, Loc, AsmString); 4030} 4031 4032