SemaDecl.cpp revision 021c3b372c58f5423b4fa2a5be6933d1c7ecc663
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 // -- Member function declarations with the same name and the 586 // same parameter types cannot be overloaded if any of them 587 // is a static member function declaration. 588 if (OldMethod->isStatic() || NewMethod->isStatic()) { 589 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 590 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 591 return true; 592 } 593 594 // C++ [class.mem]p1: 595 // [...] A member shall not be declared twice in the 596 // member-specification, except that a nested class or member 597 // class template can be declared and then later defined. 598 if (OldMethod->getLexicalDeclContext() == 599 NewMethod->getLexicalDeclContext()) { 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 } 614 615 // (C++98 8.3.5p3): 616 // All declarations for a function shall agree exactly in both the 617 // return type and the parameter-type-list. 618 if (OldQType == NewQType) 619 return MergeCompatibleFunctionDecls(New, Old); 620 621 // Fall through for conflicting redeclarations and redefinitions. 622 } 623 624 // C: Function types need to be compatible, not identical. This handles 625 // duplicate function decls like "void f(int); void f(enum X);" properly. 626 if (!getLangOptions().CPlusPlus && 627 Context.typesAreCompatible(OldQType, NewQType)) { 628 const FunctionType *OldFuncType = OldQType->getAsFunctionType(); 629 const FunctionType *NewFuncType = NewQType->getAsFunctionType(); 630 const FunctionProtoType *OldProto = 0; 631 if (isa<FunctionNoProtoType>(NewFuncType) && 632 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 633 // The old declaration provided a function prototype, but the 634 // new declaration does not. Merge in the prototype. 635 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 636 OldProto->arg_type_end()); 637 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 638 &ParamTypes[0], ParamTypes.size(), 639 OldProto->isVariadic(), 640 OldProto->getTypeQuals()); 641 New->setType(NewQType); 642 New->setInheritedPrototype(); 643 644 // Synthesize a parameter for each argument type. 645 llvm::SmallVector<ParmVarDecl*, 16> Params; 646 for (FunctionProtoType::arg_type_iterator 647 ParamType = OldProto->arg_type_begin(), 648 ParamEnd = OldProto->arg_type_end(); 649 ParamType != ParamEnd; ++ParamType) { 650 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 651 SourceLocation(), 0, 652 *ParamType, VarDecl::None, 653 0); 654 Param->setImplicit(); 655 Params.push_back(Param); 656 } 657 658 New->setParams(Context, &Params[0], Params.size()); 659 } 660 661 return MergeCompatibleFunctionDecls(New, Old); 662 } 663 664 // GNU C permits a K&R definition to follow a prototype declaration 665 // if the declared types of the parameters in the K&R definition 666 // match the types in the prototype declaration, even when the 667 // promoted types of the parameters from the K&R definition differ 668 // from the types in the prototype. GCC then keeps the types from 669 // the prototype. 670 if (!getLangOptions().CPlusPlus && 671 !getLangOptions().NoExtensions && 672 Old->hasPrototype() && !New->hasPrototype() && 673 New->getType()->getAsFunctionProtoType() && 674 Old->getNumParams() == New->getNumParams()) { 675 llvm::SmallVector<QualType, 16> ArgTypes; 676 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 677 const FunctionProtoType *OldProto 678 = Old->getType()->getAsFunctionProtoType(); 679 const FunctionProtoType *NewProto 680 = New->getType()->getAsFunctionProtoType(); 681 682 // Determine whether this is the GNU C extension. 683 bool GNUCompatible = 684 Context.typesAreCompatible(OldProto->getResultType(), 685 NewProto->getResultType()) && 686 (OldProto->isVariadic() == NewProto->isVariadic()); 687 for (unsigned Idx = 0, End = Old->getNumParams(); 688 GNUCompatible && Idx != End; ++Idx) { 689 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 690 ParmVarDecl *NewParm = New->getParamDecl(Idx); 691 if (Context.typesAreCompatible(OldParm->getType(), 692 NewProto->getArgType(Idx))) { 693 ArgTypes.push_back(NewParm->getType()); 694 } else if (Context.typesAreCompatible(OldParm->getType(), 695 NewParm->getType())) { 696 GNUCompatibleParamWarning Warn 697 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 698 Warnings.push_back(Warn); 699 ArgTypes.push_back(NewParm->getType()); 700 } else 701 GNUCompatible = false; 702 } 703 704 if (GNUCompatible) { 705 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 706 Diag(Warnings[Warn].NewParm->getLocation(), 707 diag::ext_param_promoted_not_compatible_with_prototype) 708 << Warnings[Warn].PromotedType 709 << Warnings[Warn].OldParm->getType(); 710 Diag(Warnings[Warn].OldParm->getLocation(), 711 diag::note_previous_declaration); 712 } 713 714 New->setType(Context.getFunctionType(NewProto->getResultType(), 715 &ArgTypes[0], ArgTypes.size(), 716 NewProto->isVariadic(), 717 NewProto->getTypeQuals())); 718 return MergeCompatibleFunctionDecls(New, Old); 719 } 720 721 // Fall through to diagnose conflicting types. 722 } 723 724 // A function that has already been declared has been redeclared or defined 725 // with a different type- show appropriate diagnostic 726 if (unsigned BuiltinID = Old->getBuiltinID(Context)) { 727 // The user has declared a builtin function with an incompatible 728 // signature. 729 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 730 // The function the user is redeclaring is a library-defined 731 // function like 'malloc' or 'printf'. Warn about the 732 // redeclaration, then ignore it. 733 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 734 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 735 << Old << Old->getType(); 736 return true; 737 } 738 739 PrevDiag = diag::note_previous_builtin_declaration; 740 } 741 742 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 743 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 744 return true; 745} 746 747/// \brief Completes the merge of two function declarations that are 748/// known to be compatible. 749/// 750/// This routine handles the merging of attributes and other 751/// properties of function declarations form the old declaration to 752/// the new declaration, once we know that New is in fact a 753/// redeclaration of Old. 754/// 755/// \returns false 756bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 757 // Merge the attributes 758 MergeAttributes(New, Old, Context); 759 760 // Merge the storage class. 761 New->setStorageClass(Old->getStorageClass()); 762 763 // FIXME: need to implement inline semantics 764 765 // Merge "pure" flag. 766 if (Old->isPure()) 767 New->setPure(); 768 769 // Merge the "deleted" flag. 770 if (Old->isDeleted()) 771 New->setDeleted(); 772 773 if (getLangOptions().CPlusPlus) 774 return MergeCXXFunctionDecl(New, Old); 775 776 return false; 777} 778 779/// MergeVarDecl - We just parsed a variable 'New' which has the same name 780/// and scope as a previous declaration 'Old'. Figure out how to resolve this 781/// situation, merging decls or emitting diagnostics as appropriate. 782/// 783/// Tentative definition rules (C99 6.9.2p2) are checked by 784/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 785/// definitions here, since the initializer hasn't been attached. 786/// 787bool Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 788 // Verify the old decl was also a variable. 789 VarDecl *Old = dyn_cast<VarDecl>(OldD); 790 if (!Old) { 791 Diag(New->getLocation(), diag::err_redefinition_different_kind) 792 << New->getDeclName(); 793 Diag(OldD->getLocation(), diag::note_previous_definition); 794 return true; 795 } 796 797 MergeAttributes(New, Old, Context); 798 799 // Merge the types 800 QualType MergedT = Context.mergeTypes(New->getType(), Old->getType()); 801 if (MergedT.isNull()) { 802 Diag(New->getLocation(), diag::err_redefinition_different_type) 803 << New->getDeclName(); 804 Diag(Old->getLocation(), diag::note_previous_definition); 805 return true; 806 } 807 New->setType(MergedT); 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 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 826 Diag(Old->getLocation(), diag::note_previous_definition); 827 return true; 828 } 829 830 // Keep a chain of previous declarations. 831 New->setPreviousDeclaration(Old); 832 833 return false; 834} 835 836/// CheckParmsForFunctionDef - Check that the parameters of the given 837/// function are appropriate for the definition of a function. This 838/// takes care of any checks that cannot be performed on the 839/// declaration itself, e.g., that the types of each of the function 840/// parameters are complete. 841bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 842 bool HasInvalidParm = false; 843 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 844 ParmVarDecl *Param = FD->getParamDecl(p); 845 846 // C99 6.7.5.3p4: the parameters in a parameter type list in a 847 // function declarator that is part of a function definition of 848 // that function shall not have incomplete type. 849 if (!Param->isInvalidDecl() && 850 RequireCompleteType(Param->getLocation(), Param->getType(), 851 diag::err_typecheck_decl_incomplete_type)) { 852 Param->setInvalidDecl(); 853 HasInvalidParm = true; 854 } 855 856 // C99 6.9.1p5: If the declarator includes a parameter type list, the 857 // declaration of each parameter shall include an identifier. 858 if (Param->getIdentifier() == 0 && 859 !Param->isImplicit() && 860 !getLangOptions().CPlusPlus) 861 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 862 } 863 864 return HasInvalidParm; 865} 866 867/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 868/// no declarator (e.g. "struct foo;") is parsed. 869Sema::DeclTy *Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 870 TagDecl *Tag = 0; 871 if (DS.getTypeSpecType() == DeclSpec::TST_class || 872 DS.getTypeSpecType() == DeclSpec::TST_struct || 873 DS.getTypeSpecType() == DeclSpec::TST_union || 874 DS.getTypeSpecType() == DeclSpec::TST_enum) 875 Tag = dyn_cast<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 876 877 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 878 if (!Record->getDeclName() && Record->isDefinition() && 879 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 880 if (getLangOptions().CPlusPlus || 881 Record->getDeclContext()->isRecord()) 882 return BuildAnonymousStructOrUnion(S, DS, Record); 883 884 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 885 << DS.getSourceRange(); 886 } 887 888 // Microsoft allows unnamed struct/union fields. Don't complain 889 // about them. 890 // FIXME: Should we support Microsoft's extensions in this area? 891 if (Record->getDeclName() && getLangOptions().Microsoft) 892 return Tag; 893 } 894 895 if (!DS.isMissingDeclaratorOk() && 896 DS.getTypeSpecType() != DeclSpec::TST_error) { 897 // Warn about typedefs of enums without names, since this is an 898 // extension in both Microsoft an GNU. 899 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 900 Tag && isa<EnumDecl>(Tag)) { 901 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 902 << DS.getSourceRange(); 903 return Tag; 904 } 905 906 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 907 << DS.getSourceRange(); 908 return 0; 909 } 910 911 return Tag; 912} 913 914/// InjectAnonymousStructOrUnionMembers - Inject the members of the 915/// anonymous struct or union AnonRecord into the owning context Owner 916/// and scope S. This routine will be invoked just after we realize 917/// that an unnamed union or struct is actually an anonymous union or 918/// struct, e.g., 919/// 920/// @code 921/// union { 922/// int i; 923/// float f; 924/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 925/// // f into the surrounding scope.x 926/// @endcode 927/// 928/// This routine is recursive, injecting the names of nested anonymous 929/// structs/unions into the owning context and scope as well. 930bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 931 RecordDecl *AnonRecord) { 932 bool Invalid = false; 933 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 934 FEnd = AnonRecord->field_end(); 935 F != FEnd; ++F) { 936 if ((*F)->getDeclName()) { 937 NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 938 LookupOrdinaryName, true); 939 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 940 // C++ [class.union]p2: 941 // The names of the members of an anonymous union shall be 942 // distinct from the names of any other entity in the 943 // scope in which the anonymous union is declared. 944 unsigned diagKind 945 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 946 : diag::err_anonymous_struct_member_redecl; 947 Diag((*F)->getLocation(), diagKind) 948 << (*F)->getDeclName(); 949 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 950 Invalid = true; 951 } else { 952 // C++ [class.union]p2: 953 // For the purpose of name lookup, after the anonymous union 954 // definition, the members of the anonymous union are 955 // considered to have been defined in the scope in which the 956 // anonymous union is declared. 957 Owner->makeDeclVisibleInContext(*F); 958 S->AddDecl(*F); 959 IdResolver.AddDecl(*F); 960 } 961 } else if (const RecordType *InnerRecordType 962 = (*F)->getType()->getAsRecordType()) { 963 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 964 if (InnerRecord->isAnonymousStructOrUnion()) 965 Invalid = Invalid || 966 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 967 } 968 } 969 970 return Invalid; 971} 972 973/// ActOnAnonymousStructOrUnion - Handle the declaration of an 974/// anonymous structure or union. Anonymous unions are a C++ feature 975/// (C++ [class.union]) and a GNU C extension; anonymous structures 976/// are a GNU C and GNU C++ extension. 977Sema::DeclTy *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 978 RecordDecl *Record) { 979 DeclContext *Owner = Record->getDeclContext(); 980 981 // Diagnose whether this anonymous struct/union is an extension. 982 if (Record->isUnion() && !getLangOptions().CPlusPlus) 983 Diag(Record->getLocation(), diag::ext_anonymous_union); 984 else if (!Record->isUnion()) 985 Diag(Record->getLocation(), diag::ext_anonymous_struct); 986 987 // C and C++ require different kinds of checks for anonymous 988 // structs/unions. 989 bool Invalid = false; 990 if (getLangOptions().CPlusPlus) { 991 const char* PrevSpec = 0; 992 // C++ [class.union]p3: 993 // Anonymous unions declared in a named namespace or in the 994 // global namespace shall be declared static. 995 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 996 (isa<TranslationUnitDecl>(Owner) || 997 (isa<NamespaceDecl>(Owner) && 998 cast<NamespaceDecl>(Owner)->getDeclName()))) { 999 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1000 Invalid = true; 1001 1002 // Recover by adding 'static'. 1003 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); 1004 } 1005 // C++ [class.union]p3: 1006 // A storage class is not allowed in a declaration of an 1007 // anonymous union in a class scope. 1008 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1009 isa<RecordDecl>(Owner)) { 1010 Diag(DS.getStorageClassSpecLoc(), 1011 diag::err_anonymous_union_with_storage_spec); 1012 Invalid = true; 1013 1014 // Recover by removing the storage specifier. 1015 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1016 PrevSpec); 1017 } 1018 1019 // C++ [class.union]p2: 1020 // The member-specification of an anonymous union shall only 1021 // define non-static data members. [Note: nested types and 1022 // functions cannot be declared within an anonymous union. ] 1023 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1024 MemEnd = Record->decls_end(); 1025 Mem != MemEnd; ++Mem) { 1026 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1027 // C++ [class.union]p3: 1028 // An anonymous union shall not have private or protected 1029 // members (clause 11). 1030 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1031 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1032 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1033 Invalid = true; 1034 } 1035 } else if ((*Mem)->isImplicit()) { 1036 // Any implicit members are fine. 1037 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1038 // This is a type that showed up in an 1039 // elaborated-type-specifier inside the anonymous struct or 1040 // union, but which actually declares a type outside of the 1041 // anonymous struct or union. It's okay. 1042 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1043 if (!MemRecord->isAnonymousStructOrUnion() && 1044 MemRecord->getDeclName()) { 1045 // This is a nested type declaration. 1046 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1047 << (int)Record->isUnion(); 1048 Invalid = true; 1049 } 1050 } else { 1051 // We have something that isn't a non-static data 1052 // member. Complain about it. 1053 unsigned DK = diag::err_anonymous_record_bad_member; 1054 if (isa<TypeDecl>(*Mem)) 1055 DK = diag::err_anonymous_record_with_type; 1056 else if (isa<FunctionDecl>(*Mem)) 1057 DK = diag::err_anonymous_record_with_function; 1058 else if (isa<VarDecl>(*Mem)) 1059 DK = diag::err_anonymous_record_with_static; 1060 Diag((*Mem)->getLocation(), DK) 1061 << (int)Record->isUnion(); 1062 Invalid = true; 1063 } 1064 } 1065 } 1066 1067 if (!Record->isUnion() && !Owner->isRecord()) { 1068 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1069 << (int)getLangOptions().CPlusPlus; 1070 Invalid = true; 1071 } 1072 1073 // Create a declaration for this anonymous struct/union. 1074 NamedDecl *Anon = 0; 1075 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1076 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1077 /*IdentifierInfo=*/0, 1078 Context.getTypeDeclType(Record), 1079 /*BitWidth=*/0, /*Mutable=*/false); 1080 Anon->setAccess(AS_public); 1081 if (getLangOptions().CPlusPlus) 1082 FieldCollector->Add(cast<FieldDecl>(Anon)); 1083 } else { 1084 VarDecl::StorageClass SC; 1085 switch (DS.getStorageClassSpec()) { 1086 default: assert(0 && "Unknown storage class!"); 1087 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1088 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1089 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1090 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1091 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1092 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1093 case DeclSpec::SCS_mutable: 1094 // mutable can only appear on non-static class members, so it's always 1095 // an error here 1096 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1097 Invalid = true; 1098 SC = VarDecl::None; 1099 break; 1100 } 1101 1102 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1103 /*IdentifierInfo=*/0, 1104 Context.getTypeDeclType(Record), 1105 SC, DS.getSourceRange().getBegin()); 1106 } 1107 Anon->setImplicit(); 1108 1109 // Add the anonymous struct/union object to the current 1110 // context. We'll be referencing this object when we refer to one of 1111 // its members. 1112 Owner->addDecl(Anon); 1113 1114 // Inject the members of the anonymous struct/union into the owning 1115 // context and into the identifier resolver chain for name lookup 1116 // purposes. 1117 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1118 Invalid = true; 1119 1120 // Mark this as an anonymous struct/union type. Note that we do not 1121 // do this until after we have already checked and injected the 1122 // members of this anonymous struct/union type, because otherwise 1123 // the members could be injected twice: once by DeclContext when it 1124 // builds its lookup table, and once by 1125 // InjectAnonymousStructOrUnionMembers. 1126 Record->setAnonymousStructOrUnion(true); 1127 1128 if (Invalid) 1129 Anon->setInvalidDecl(); 1130 1131 return Anon; 1132} 1133 1134 1135/// GetNameForDeclarator - Determine the full declaration name for the 1136/// given Declarator. 1137DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1138 switch (D.getKind()) { 1139 case Declarator::DK_Abstract: 1140 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 1141 return DeclarationName(); 1142 1143 case Declarator::DK_Normal: 1144 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 1145 return DeclarationName(D.getIdentifier()); 1146 1147 case Declarator::DK_Constructor: { 1148 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1149 Ty = Context.getCanonicalType(Ty); 1150 return Context.DeclarationNames.getCXXConstructorName(Ty); 1151 } 1152 1153 case Declarator::DK_Destructor: { 1154 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1155 Ty = Context.getCanonicalType(Ty); 1156 return Context.DeclarationNames.getCXXDestructorName(Ty); 1157 } 1158 1159 case Declarator::DK_Conversion: { 1160 // FIXME: We'd like to keep the non-canonical type for diagnostics! 1161 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1162 Ty = Context.getCanonicalType(Ty); 1163 return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 1164 } 1165 1166 case Declarator::DK_Operator: 1167 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 1168 return Context.DeclarationNames.getCXXOperatorName( 1169 D.getOverloadedOperator()); 1170 } 1171 1172 assert(false && "Unknown name kind"); 1173 return DeclarationName(); 1174} 1175 1176/// isNearlyMatchingFunction - Determine whether the C++ functions 1177/// Declaration and Definition are "nearly" matching. This heuristic 1178/// is used to improve diagnostics in the case where an out-of-line 1179/// function definition doesn't match any declaration within 1180/// the class or namespace. 1181static bool isNearlyMatchingFunction(ASTContext &Context, 1182 FunctionDecl *Declaration, 1183 FunctionDecl *Definition) { 1184 if (Declaration->param_size() != Definition->param_size()) 1185 return false; 1186 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1187 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1188 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1189 1190 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1191 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 1192 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1193 return false; 1194 } 1195 1196 return true; 1197} 1198 1199Sema::DeclTy * 1200Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl, 1201 bool IsFunctionDefinition) { 1202 NamedDecl *LastDeclarator = dyn_cast_or_null<NamedDecl>((Decl *)lastDecl); 1203 DeclarationName Name = GetNameForDeclarator(D); 1204 1205 // All of these full declarators require an identifier. If it doesn't have 1206 // one, the ParsedFreeStandingDeclSpec action should be used. 1207 if (!Name) { 1208 if (!D.getInvalidType()) // Reject this if we think it is valid. 1209 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1210 diag::err_declarator_need_ident) 1211 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1212 return 0; 1213 } 1214 1215 // The scope passed in may not be a decl scope. Zip up the scope tree until 1216 // we find one that is. 1217 while ((S->getFlags() & Scope::DeclScope) == 0 || 1218 (S->getFlags() & Scope::TemplateParamScope) != 0) 1219 S = S->getParent(); 1220 1221 DeclContext *DC; 1222 NamedDecl *PrevDecl; 1223 NamedDecl *New; 1224 bool InvalidDecl = false; 1225 1226 QualType R = GetTypeForDeclarator(D, S); 1227 if (R.isNull()) { 1228 InvalidDecl = true; 1229 R = Context.IntTy; 1230 } 1231 1232 // See if this is a redefinition of a variable in the same scope. 1233 if (D.getCXXScopeSpec().isInvalid()) { 1234 DC = CurContext; 1235 PrevDecl = 0; 1236 InvalidDecl = true; 1237 } else if (!D.getCXXScopeSpec().isSet()) { 1238 LookupNameKind NameKind = LookupOrdinaryName; 1239 1240 // If the declaration we're planning to build will be a function 1241 // or object with linkage, then look for another declaration with 1242 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1243 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1244 /* Do nothing*/; 1245 else if (R->isFunctionType()) { 1246 if (CurContext->isFunctionOrMethod()) 1247 NameKind = LookupRedeclarationWithLinkage; 1248 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1249 NameKind = LookupRedeclarationWithLinkage; 1250 1251 DC = CurContext; 1252 PrevDecl = LookupName(S, Name, NameKind, true, 1253 D.getDeclSpec().getStorageClassSpec() != 1254 DeclSpec::SCS_static, 1255 D.getIdentifierLoc()); 1256 } else { // Something like "int foo::x;" 1257 DC = static_cast<DeclContext*>(D.getCXXScopeSpec().getScopeRep()); 1258 // FIXME: RequireCompleteDeclContext(D.getCXXScopeSpec()); ? 1259 PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName, true); 1260 1261 // C++ 7.3.1.2p2: 1262 // Members (including explicit specializations of templates) of a named 1263 // namespace can also be defined outside that namespace by explicit 1264 // qualification of the name being defined, provided that the entity being 1265 // defined was already declared in the namespace and the definition appears 1266 // after the point of declaration in a namespace that encloses the 1267 // declarations namespace. 1268 // 1269 // Note that we only check the context at this point. We don't yet 1270 // have enough information to make sure that PrevDecl is actually 1271 // the declaration we want to match. For example, given: 1272 // 1273 // class X { 1274 // void f(); 1275 // void f(float); 1276 // }; 1277 // 1278 // void X::f(int) { } // ill-formed 1279 // 1280 // In this case, PrevDecl will point to the overload set 1281 // containing the two f's declared in X, but neither of them 1282 // matches. 1283 1284 // First check whether we named the global scope. 1285 if (isa<TranslationUnitDecl>(DC)) { 1286 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1287 << Name << D.getCXXScopeSpec().getRange(); 1288 } else if (!CurContext->Encloses(DC)) { 1289 // The qualifying scope doesn't enclose the original declaration. 1290 // Emit diagnostic based on current scope. 1291 SourceLocation L = D.getIdentifierLoc(); 1292 SourceRange R = D.getCXXScopeSpec().getRange(); 1293 if (isa<FunctionDecl>(CurContext)) 1294 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1295 else 1296 Diag(L, diag::err_invalid_declarator_scope) 1297 << Name << cast<NamedDecl>(DC) << R; 1298 InvalidDecl = true; 1299 } 1300 } 1301 1302 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1303 // Maybe we will complain about the shadowed template parameter. 1304 InvalidDecl = InvalidDecl 1305 || DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 1306 // Just pretend that we didn't see the previous declaration. 1307 PrevDecl = 0; 1308 } 1309 1310 // In C++, the previous declaration we find might be a tag type 1311 // (class or enum). In this case, the new declaration will hide the 1312 // tag type. Note that this does does not apply if we're declaring a 1313 // typedef (C++ [dcl.typedef]p4). 1314 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 1315 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1316 PrevDecl = 0; 1317 1318 bool Redeclaration = false; 1319 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1320 New = ActOnTypedefDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1321 InvalidDecl, Redeclaration); 1322 } else if (R->isFunctionType()) { 1323 New = ActOnFunctionDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1324 IsFunctionDefinition, InvalidDecl, 1325 Redeclaration); 1326 } else { 1327 New = ActOnVariableDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1328 InvalidDecl, Redeclaration); 1329 } 1330 1331 if (New == 0) 1332 return 0; 1333 1334 // Set the lexical context. If the declarator has a C++ scope specifier, the 1335 // lexical context will be different from the semantic context. 1336 New->setLexicalDeclContext(CurContext); 1337 1338 // If this has an identifier and is not an invalid redeclaration, 1339 // add it to the scope stack. 1340 if (Name && !(Redeclaration && InvalidDecl)) 1341 PushOnScopeChains(New, S); 1342 // If any semantic error occurred, mark the decl as invalid. 1343 if (D.getInvalidType() || InvalidDecl) 1344 New->setInvalidDecl(); 1345 1346 return New; 1347} 1348 1349/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 1350/// types into constant array types in certain situations which would otherwise 1351/// be errors (for GCC compatibility). 1352static QualType TryToFixInvalidVariablyModifiedType(QualType T, 1353 ASTContext &Context, 1354 bool &SizeIsNegative) { 1355 // This method tries to turn a variable array into a constant 1356 // array even when the size isn't an ICE. This is necessary 1357 // for compatibility with code that depends on gcc's buggy 1358 // constant expression folding, like struct {char x[(int)(char*)2];} 1359 SizeIsNegative = false; 1360 1361 if (const PointerType* PTy = dyn_cast<PointerType>(T)) { 1362 QualType Pointee = PTy->getPointeeType(); 1363 QualType FixedType = 1364 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 1365 if (FixedType.isNull()) return FixedType; 1366 FixedType = Context.getPointerType(FixedType); 1367 FixedType.setCVRQualifiers(T.getCVRQualifiers()); 1368 return FixedType; 1369 } 1370 1371 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 1372 if (!VLATy) 1373 return QualType(); 1374 // FIXME: We should probably handle this case 1375 if (VLATy->getElementType()->isVariablyModifiedType()) 1376 return QualType(); 1377 1378 Expr::EvalResult EvalResult; 1379 if (!VLATy->getSizeExpr() || 1380 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 1381 !EvalResult.Val.isInt()) 1382 return QualType(); 1383 1384 llvm::APSInt &Res = EvalResult.Val.getInt(); 1385 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) 1386 return Context.getConstantArrayType(VLATy->getElementType(), 1387 Res, ArrayType::Normal, 0); 1388 1389 SizeIsNegative = true; 1390 return QualType(); 1391} 1392 1393/// \brief Register the given locally-scoped external C declaration so 1394/// that it can be found later for redeclarations 1395void 1396Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, NamedDecl *PrevDecl, 1397 Scope *S) { 1398 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 1399 "Decl is not a locally-scoped decl!"); 1400 // Note that we have a locally-scoped external with this name. 1401 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 1402 1403 if (!PrevDecl) 1404 return; 1405 1406 // If there was a previous declaration of this variable, it may be 1407 // in our identifier chain. Update the identifier chain with the new 1408 // declaration. 1409 if (IdResolver.ReplaceDecl(PrevDecl, ND)) { 1410 // The previous declaration was found on the identifer resolver 1411 // chain, so remove it from its scope. 1412 while (S && !S->isDeclScope(PrevDecl)) 1413 S = S->getParent(); 1414 1415 if (S) 1416 S->RemoveDecl(PrevDecl); 1417 } 1418} 1419 1420NamedDecl* 1421Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1422 QualType R, Decl* LastDeclarator, 1423 Decl* PrevDecl, bool& InvalidDecl, 1424 bool &Redeclaration) { 1425 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1426 if (D.getCXXScopeSpec().isSet()) { 1427 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1428 << D.getCXXScopeSpec().getRange(); 1429 InvalidDecl = true; 1430 // Pretend we didn't see the scope specifier. 1431 DC = 0; 1432 } 1433 1434 if (getLangOptions().CPlusPlus) { 1435 // Check that there are no default arguments (C++ only). 1436 CheckExtraCXXDefaultArguments(D); 1437 1438 if (D.getDeclSpec().isVirtualSpecified()) 1439 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1440 diag::err_virtual_non_function); 1441 } 1442 1443 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, LastDeclarator); 1444 if (!NewTD) return 0; 1445 1446 // Handle attributes prior to checking for duplicates in MergeVarDecl 1447 ProcessDeclAttributes(NewTD, D); 1448 // Merge the decl with the existing one if appropriate. If the decl is 1449 // in an outer scope, it isn't the same thing. 1450 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1451 Redeclaration = true; 1452 if (MergeTypeDefDecl(NewTD, PrevDecl)) 1453 InvalidDecl = true; 1454 } 1455 1456 if (S->getFnParent() == 0) { 1457 QualType T = NewTD->getUnderlyingType(); 1458 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1459 // then it shall have block scope. 1460 if (T->isVariablyModifiedType()) { 1461 bool SizeIsNegative; 1462 QualType FixedTy = 1463 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1464 if (!FixedTy.isNull()) { 1465 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 1466 NewTD->setUnderlyingType(FixedTy); 1467 } else { 1468 if (SizeIsNegative) 1469 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 1470 else if (T->isVariableArrayType()) 1471 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1472 else 1473 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1474 InvalidDecl = true; 1475 } 1476 } 1477 } 1478 return NewTD; 1479} 1480 1481/// \brief Determines whether the given declaration is an out-of-scope 1482/// previous declaration. 1483/// 1484/// This routine should be invoked when name lookup has found a 1485/// previous declaration (PrevDecl) that is not in the scope where a 1486/// new declaration by the same name is being introduced. If the new 1487/// declaration occurs in a local scope, previous declarations with 1488/// linkage may still be considered previous declarations (C99 1489/// 6.2.2p4-5, C++ [basic.link]p6). 1490/// 1491/// \param PrevDecl the previous declaration found by name 1492/// lookup 1493/// 1494/// \param DC the context in which the new declaration is being 1495/// declared. 1496/// 1497/// \returns true if PrevDecl is an out-of-scope previous declaration 1498/// for a new delcaration with the same name. 1499static bool 1500isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 1501 ASTContext &Context) { 1502 if (!PrevDecl) 1503 return 0; 1504 1505 // FIXME: PrevDecl could be an OverloadedFunctionDecl, in which 1506 // case we need to check each of the overloaded functions. 1507 if (!PrevDecl->hasLinkage()) 1508 return false; 1509 1510 if (Context.getLangOptions().CPlusPlus) { 1511 // C++ [basic.link]p6: 1512 // If there is a visible declaration of an entity with linkage 1513 // having the same name and type, ignoring entities declared 1514 // outside the innermost enclosing namespace scope, the block 1515 // scope declaration declares that same entity and receives the 1516 // linkage of the previous declaration. 1517 DeclContext *OuterContext = DC->getLookupContext(); 1518 if (!OuterContext->isFunctionOrMethod()) 1519 // This rule only applies to block-scope declarations. 1520 return false; 1521 else { 1522 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 1523 if (PrevOuterContext->isRecord()) 1524 // We found a member function: ignore it. 1525 return false; 1526 else { 1527 // Find the innermost enclosing namespace for the new and 1528 // previous declarations. 1529 while (!OuterContext->isFileContext()) 1530 OuterContext = OuterContext->getParent(); 1531 while (!PrevOuterContext->isFileContext()) 1532 PrevOuterContext = PrevOuterContext->getParent(); 1533 1534 // The previous declaration is in a different namespace, so it 1535 // isn't the same function. 1536 if (OuterContext->getPrimaryContext() != 1537 PrevOuterContext->getPrimaryContext()) 1538 return false; 1539 } 1540 } 1541 } 1542 1543 return true; 1544} 1545 1546NamedDecl* 1547Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1548 QualType R, Decl* LastDeclarator, 1549 NamedDecl* PrevDecl, bool& InvalidDecl, 1550 bool &Redeclaration) { 1551 DeclarationName Name = GetNameForDeclarator(D); 1552 1553 // Check that there are no default arguments (C++ only). 1554 if (getLangOptions().CPlusPlus) 1555 CheckExtraCXXDefaultArguments(D); 1556 1557 if (R.getTypePtr()->isObjCInterfaceType()) { 1558 Diag(D.getIdentifierLoc(), diag::err_statically_allocated_object); 1559 InvalidDecl = true; 1560 } 1561 1562 VarDecl *NewVD; 1563 VarDecl::StorageClass SC; 1564 switch (D.getDeclSpec().getStorageClassSpec()) { 1565 default: assert(0 && "Unknown storage class!"); 1566 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1567 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1568 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1569 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1570 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1571 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1572 case DeclSpec::SCS_mutable: 1573 // mutable can only appear on non-static class members, so it's always 1574 // an error here 1575 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1576 InvalidDecl = true; 1577 SC = VarDecl::None; 1578 break; 1579 } 1580 1581 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1582 if (!II) { 1583 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1584 << Name.getAsString(); 1585 return 0; 1586 } 1587 1588 if (D.getDeclSpec().isVirtualSpecified()) 1589 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1590 diag::err_virtual_non_function); 1591 1592 bool ThreadSpecified = D.getDeclSpec().isThreadSpecified(); 1593 if (!DC->isRecord() && S->getFnParent() == 0) { 1594 // C99 6.9p2: The storage-class specifiers auto and register shall not 1595 // appear in the declaration specifiers in an external declaration. 1596 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 1597 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 1598 InvalidDecl = true; 1599 } 1600 } 1601 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1602 II, R, SC, 1603 // FIXME: Move to DeclGroup... 1604 D.getDeclSpec().getSourceRange().getBegin()); 1605 NewVD->setThreadSpecified(ThreadSpecified); 1606 NewVD->setNextDeclarator(LastDeclarator); 1607 1608 // Handle attributes prior to checking for duplicates in MergeVarDecl 1609 ProcessDeclAttributes(NewVD, D); 1610 1611 // Handle GNU asm-label extension (encoded as an attribute). 1612 if (Expr *E = (Expr*) D.getAsmLabel()) { 1613 // The parser guarantees this is a string. 1614 StringLiteral *SE = cast<StringLiteral>(E); 1615 NewVD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 1616 SE->getByteLength()))); 1617 } 1618 1619 // Emit an error if an address space was applied to decl with local storage. 1620 // This includes arrays of objects with address space qualifiers, but not 1621 // automatic variables that point to other address spaces. 1622 // ISO/IEC TR 18037 S5.1.2 1623 if (NewVD->hasLocalStorage() && (NewVD->getType().getAddressSpace() != 0)) { 1624 Diag(D.getIdentifierLoc(), diag::err_as_qualified_auto_decl); 1625 InvalidDecl = true; 1626 } 1627 1628 if (NewVD->hasLocalStorage() && NewVD->getType().isObjCGCWeak()) { 1629 Diag(D.getIdentifierLoc(), diag::warn_attribute_weak_on_local); 1630 } 1631 1632 bool isIllegalVLA = R->isVariableArrayType() && NewVD->hasGlobalStorage(); 1633 bool isIllegalVM = R->isVariablyModifiedType() && NewVD->hasLinkage(); 1634 if (isIllegalVLA || isIllegalVM) { 1635 bool SizeIsNegative; 1636 QualType FixedTy = 1637 TryToFixInvalidVariablyModifiedType(R, Context, SizeIsNegative); 1638 if (!FixedTy.isNull()) { 1639 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 1640 NewVD->setType(FixedTy); 1641 } else if (R->isVariableArrayType()) { 1642 NewVD->setInvalidDecl(); 1643 1644 const VariableArrayType *VAT = Context.getAsVariableArrayType(R); 1645 // FIXME: This won't give the correct result for 1646 // int a[10][n]; 1647 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 1648 1649 if (NewVD->isFileVarDecl()) 1650 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 1651 << SizeRange; 1652 else if (NewVD->getStorageClass() == VarDecl::Static) 1653 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 1654 << SizeRange; 1655 else 1656 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 1657 << SizeRange; 1658 } else { 1659 InvalidDecl = true; 1660 1661 if (NewVD->isFileVarDecl()) 1662 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 1663 else 1664 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 1665 } 1666 } 1667 1668 // If name lookup finds a previous declaration that is not in the 1669 // same scope as the new declaration, this may still be an 1670 // acceptable redeclaration. 1671 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 1672 !(NewVD->hasLinkage() && 1673 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 1674 PrevDecl = 0; 1675 1676 if (!PrevDecl && NewVD->isExternC(Context)) { 1677 // Since we did not find anything by this name and we're declaring 1678 // an extern "C" variable, look for a non-visible extern "C" 1679 // declaration with the same name. 1680 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 1681 = LocallyScopedExternalDecls.find(Name); 1682 if (Pos != LocallyScopedExternalDecls.end()) 1683 PrevDecl = Pos->second; 1684 } 1685 1686 // Merge the decl with the existing one if appropriate. 1687 if (PrevDecl) { 1688 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 1689 // The user tried to define a non-static data member 1690 // out-of-line (C++ [dcl.meaning]p1). 1691 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 1692 << D.getCXXScopeSpec().getRange(); 1693 NewVD->Destroy(Context); 1694 return 0; 1695 } 1696 1697 Redeclaration = true; 1698 if (MergeVarDecl(NewVD, PrevDecl)) 1699 InvalidDecl = true; 1700 1701 if (D.getCXXScopeSpec().isSet()) { 1702 // No previous declaration in the qualifying scope. 1703 Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 1704 << Name << D.getCXXScopeSpec().getRange(); 1705 InvalidDecl = true; 1706 } 1707 } 1708 1709 if (!InvalidDecl && R->isVoidType() && !NewVD->hasExternalStorage()) { 1710 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 1711 << R; 1712 InvalidDecl = true; 1713 } 1714 1715 1716 // If this is a locally-scoped extern C variable, update the map of 1717 // such variables. 1718 if (CurContext->isFunctionOrMethod() && NewVD->isExternC(Context) && 1719 !InvalidDecl) 1720 RegisterLocallyScopedExternCDecl(NewVD, PrevDecl, S); 1721 1722 return NewVD; 1723} 1724 1725NamedDecl* 1726Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1727 QualType R, Decl *LastDeclarator, 1728 NamedDecl* PrevDecl, bool IsFunctionDefinition, 1729 bool& InvalidDecl, bool &Redeclaration) { 1730 assert(R.getTypePtr()->isFunctionType()); 1731 1732 DeclarationName Name = GetNameForDeclarator(D); 1733 FunctionDecl::StorageClass SC = FunctionDecl::None; 1734 switch (D.getDeclSpec().getStorageClassSpec()) { 1735 default: assert(0 && "Unknown storage class!"); 1736 case DeclSpec::SCS_auto: 1737 case DeclSpec::SCS_register: 1738 case DeclSpec::SCS_mutable: 1739 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1740 diag::err_typecheck_sclass_func); 1741 InvalidDecl = true; 1742 break; 1743 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 1744 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 1745 case DeclSpec::SCS_static: { 1746 if (DC->getLookupContext()->isFunctionOrMethod()) { 1747 // C99 6.7.1p5: 1748 // The declaration of an identifier for a function that has 1749 // block scope shall have no explicit storage-class specifier 1750 // other than extern 1751 // See also (C++ [dcl.stc]p4). 1752 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1753 diag::err_static_block_func); 1754 SC = FunctionDecl::None; 1755 } else 1756 SC = FunctionDecl::Static; 1757 break; 1758 } 1759 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 1760 } 1761 1762 bool isInline = D.getDeclSpec().isInlineSpecified(); 1763 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1764 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 1765 1766 bool isVirtualOkay = false; 1767 FunctionDecl *NewFD; 1768 if (D.getKind() == Declarator::DK_Constructor) { 1769 // This is a C++ constructor declaration. 1770 assert(DC->isRecord() && 1771 "Constructors can only be declared in a member context"); 1772 1773 InvalidDecl = InvalidDecl || CheckConstructorDeclarator(D, R, SC); 1774 1775 // Create the new declaration 1776 NewFD = CXXConstructorDecl::Create(Context, 1777 cast<CXXRecordDecl>(DC), 1778 D.getIdentifierLoc(), Name, R, 1779 isExplicit, isInline, 1780 /*isImplicitlyDeclared=*/false); 1781 1782 if (InvalidDecl) 1783 NewFD->setInvalidDecl(); 1784 } else if (D.getKind() == Declarator::DK_Destructor) { 1785 // This is a C++ destructor declaration. 1786 if (DC->isRecord()) { 1787 InvalidDecl = InvalidDecl || CheckDestructorDeclarator(D, R, SC); 1788 1789 NewFD = CXXDestructorDecl::Create(Context, 1790 cast<CXXRecordDecl>(DC), 1791 D.getIdentifierLoc(), Name, R, 1792 isInline, 1793 /*isImplicitlyDeclared=*/false); 1794 1795 if (InvalidDecl) 1796 NewFD->setInvalidDecl(); 1797 1798 isVirtualOkay = true; 1799 } else { 1800 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 1801 1802 // Create a FunctionDecl to satisfy the function definition parsing 1803 // code path. 1804 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 1805 Name, R, SC, isInline, 1806 /*hasPrototype=*/true, 1807 // FIXME: Move to DeclGroup... 1808 D.getDeclSpec().getSourceRange().getBegin()); 1809 InvalidDecl = true; 1810 NewFD->setInvalidDecl(); 1811 } 1812 } else if (D.getKind() == Declarator::DK_Conversion) { 1813 if (!DC->isRecord()) { 1814 Diag(D.getIdentifierLoc(), 1815 diag::err_conv_function_not_member); 1816 return 0; 1817 } else { 1818 InvalidDecl = InvalidDecl || CheckConversionDeclarator(D, R, SC); 1819 1820 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 1821 D.getIdentifierLoc(), Name, R, 1822 isInline, isExplicit); 1823 1824 if (InvalidDecl) 1825 NewFD->setInvalidDecl(); 1826 1827 isVirtualOkay = true; 1828 } 1829 } else if (DC->isRecord()) { 1830 // This is a C++ method declaration. 1831 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 1832 D.getIdentifierLoc(), Name, R, 1833 (SC == FunctionDecl::Static), isInline); 1834 1835 isVirtualOkay = (SC != FunctionDecl::Static); 1836 } else { 1837 NewFD = FunctionDecl::Create(Context, DC, 1838 D.getIdentifierLoc(), 1839 Name, R, SC, isInline, 1840 /*hasPrototype=*/ 1841 (getLangOptions().CPlusPlus || 1842 (D.getNumTypeObjects() && 1843 D.getTypeObject(0).Fun.hasPrototype)), 1844 // FIXME: Move to DeclGroup... 1845 D.getDeclSpec().getSourceRange().getBegin()); 1846 } 1847 NewFD->setNextDeclarator(LastDeclarator); 1848 1849 // Set the lexical context. If the declarator has a C++ 1850 // scope specifier, the lexical context will be different 1851 // from the semantic context. 1852 NewFD->setLexicalDeclContext(CurContext); 1853 1854 // C++ [dcl.fct.spec]p5: 1855 // The virtual specifier shall only be used in declarations of 1856 // nonstatic class member functions that appear within a 1857 // member-specification of a class declaration; see 10.3. 1858 // 1859 // FIXME: Checking the 'virtual' specifier is not sufficient. A 1860 // function is also virtual if it overrides an already virtual 1861 // function. This is important to do here because it's part of the 1862 // declaration. 1863 if (isVirtual && !InvalidDecl) { 1864 if (!isVirtualOkay) { 1865 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1866 diag::err_virtual_non_function); 1867 } else if (!CurContext->isRecord()) { 1868 // 'virtual' was specified outside of the class. 1869 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 1870 << CodeModificationHint::CreateRemoval( 1871 SourceRange(D.getDeclSpec().getVirtualSpecLoc())); 1872 } else { 1873 // Okay: Add virtual to the method. 1874 cast<CXXMethodDecl>(NewFD)->setVirtual(); 1875 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 1876 CurClass->setAggregate(false); 1877 CurClass->setPOD(false); 1878 CurClass->setPolymorphic(true); 1879 } 1880 } 1881 1882 // Handle GNU asm-label extension (encoded as an attribute). 1883 if (Expr *E = (Expr*) D.getAsmLabel()) { 1884 // The parser guarantees this is a string. 1885 StringLiteral *SE = cast<StringLiteral>(E); 1886 NewFD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 1887 SE->getByteLength()))); 1888 } 1889 1890 // Copy the parameter declarations from the declarator D to 1891 // the function declaration NewFD, if they are available. 1892 if (D.getNumTypeObjects() > 0) { 1893 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1894 1895 // Create Decl objects for each parameter, adding them to the 1896 // FunctionDecl. 1897 llvm::SmallVector<ParmVarDecl*, 16> Params; 1898 1899 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 1900 // function that takes no arguments, not a function that takes a 1901 // single void argument. 1902 // We let through "const void" here because Sema::GetTypeForDeclarator 1903 // already checks for that case. 1904 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1905 FTI.ArgInfo[0].Param && 1906 ((ParmVarDecl*)FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 1907 // empty arg list, don't push any params. 1908 ParmVarDecl *Param = (ParmVarDecl*)FTI.ArgInfo[0].Param; 1909 1910 // In C++, the empty parameter-type-list must be spelled "void"; a 1911 // typedef of void is not permitted. 1912 if (getLangOptions().CPlusPlus && 1913 Param->getType().getUnqualifiedType() != Context.VoidTy) { 1914 Diag(Param->getLocation(), diag::ext_param_typedef_of_void); 1915 } 1916 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 1917 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 1918 Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 1919 } 1920 1921 NewFD->setParams(Context, &Params[0], Params.size()); 1922 } else if (R->getAsTypedefType()) { 1923 // When we're declaring a function with a typedef, as in the 1924 // following example, we'll need to synthesize (unnamed) 1925 // parameters for use in the declaration. 1926 // 1927 // @code 1928 // typedef void fn(int); 1929 // fn f; 1930 // @endcode 1931 const FunctionProtoType *FT = R->getAsFunctionProtoType(); 1932 if (!FT) { 1933 // This is a typedef of a function with no prototype, so we 1934 // don't need to do anything. 1935 } else if ((FT->getNumArgs() == 0) || 1936 (FT->getNumArgs() == 1 && !FT->isVariadic() && 1937 FT->getArgType(0)->isVoidType())) { 1938 // This is a zero-argument function. We don't need to do anything. 1939 } else { 1940 // Synthesize a parameter for each argument type. 1941 llvm::SmallVector<ParmVarDecl*, 16> Params; 1942 for (FunctionProtoType::arg_type_iterator ArgType = FT->arg_type_begin(); 1943 ArgType != FT->arg_type_end(); ++ArgType) { 1944 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, 1945 SourceLocation(), 0, 1946 *ArgType, VarDecl::None, 1947 0); 1948 Param->setImplicit(); 1949 Params.push_back(Param); 1950 } 1951 1952 NewFD->setParams(Context, &Params[0], Params.size()); 1953 } 1954 } 1955 1956 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) 1957 InvalidDecl = InvalidDecl || CheckConstructor(Constructor); 1958 else if (isa<CXXDestructorDecl>(NewFD)) { 1959 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 1960 Record->setUserDeclaredDestructor(true); 1961 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 1962 // user-defined destructor. 1963 Record->setPOD(false); 1964 } else if (CXXConversionDecl *Conversion = 1965 dyn_cast<CXXConversionDecl>(NewFD)) 1966 ActOnConversionDeclarator(Conversion); 1967 1968 // Extra checking for C++ overloaded operators (C++ [over.oper]). 1969 if (NewFD->isOverloadedOperator() && 1970 CheckOverloadedOperatorDeclaration(NewFD)) 1971 NewFD->setInvalidDecl(); 1972 1973 // If name lookup finds a previous declaration that is not in the 1974 // same scope as the new declaration, this may still be an 1975 // acceptable redeclaration. 1976 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 1977 !(NewFD->hasLinkage() && 1978 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 1979 PrevDecl = 0; 1980 1981 if (!PrevDecl && NewFD->isExternC(Context)) { 1982 // Since we did not find anything by this name and we're declaring 1983 // an extern "C" function, look for a non-visible extern "C" 1984 // declaration with the same name. 1985 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 1986 = LocallyScopedExternalDecls.find(Name); 1987 if (Pos != LocallyScopedExternalDecls.end()) 1988 PrevDecl = Pos->second; 1989 } 1990 1991 // Merge or overload the declaration with an existing declaration of 1992 // the same name, if appropriate. 1993 bool OverloadableAttrRequired = false; 1994 if (PrevDecl) { 1995 // Determine whether NewFD is an overload of PrevDecl or 1996 // a declaration that requires merging. If it's an overload, 1997 // there's no more work to do here; we'll just add the new 1998 // function to the scope. 1999 OverloadedFunctionDecl::function_iterator MatchedDecl; 2000 2001 if (!getLangOptions().CPlusPlus && 2002 AllowOverloadingOfFunction(PrevDecl, Context)) { 2003 OverloadableAttrRequired = true; 2004 2005 // Functions marked "overloadable" must have a prototype (that 2006 // we can't get through declaration merging). 2007 if (!R->getAsFunctionProtoType()) { 2008 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_no_prototype) 2009 << NewFD; 2010 InvalidDecl = true; 2011 Redeclaration = true; 2012 2013 // Turn this into a variadic function with no parameters. 2014 R = Context.getFunctionType(R->getAsFunctionType()->getResultType(), 2015 0, 0, true, 0); 2016 NewFD->setType(R); 2017 } 2018 } 2019 2020 if (PrevDecl && 2021 (!AllowOverloadingOfFunction(PrevDecl, Context) || 2022 !IsOverload(NewFD, PrevDecl, MatchedDecl))) { 2023 Redeclaration = true; 2024 Decl *OldDecl = PrevDecl; 2025 2026 // If PrevDecl was an overloaded function, extract the 2027 // FunctionDecl that matched. 2028 if (isa<OverloadedFunctionDecl>(PrevDecl)) 2029 OldDecl = *MatchedDecl; 2030 2031 // NewFD and PrevDecl represent declarations that need to be 2032 // merged. 2033 if (MergeFunctionDecl(NewFD, OldDecl)) 2034 InvalidDecl = true; 2035 2036 if (!InvalidDecl) { 2037 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 2038 2039 // An out-of-line member function declaration must also be a 2040 // definition (C++ [dcl.meaning]p1). 2041 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 2042 !InvalidDecl) { 2043 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2044 << D.getCXXScopeSpec().getRange(); 2045 NewFD->setInvalidDecl(); 2046 } 2047 } 2048 } 2049 } 2050 2051 if (D.getCXXScopeSpec().isSet() && 2052 (!PrevDecl || !Redeclaration)) { 2053 // The user tried to provide an out-of-line definition for a 2054 // function that is a member of a class or namespace, but there 2055 // was no such member function declared (C++ [class.mfct]p2, 2056 // C++ [namespace.memdef]p2). For example: 2057 // 2058 // class X { 2059 // void f() const; 2060 // }; 2061 // 2062 // void X::f() { } // ill-formed 2063 // 2064 // Complain about this problem, and attempt to suggest close 2065 // matches (e.g., those that differ only in cv-qualifiers and 2066 // whether the parameter types are references). 2067 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 2068 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 2069 InvalidDecl = true; 2070 2071 LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 2072 true); 2073 assert(!Prev.isAmbiguous() && 2074 "Cannot have an ambiguity in previous-declaration lookup"); 2075 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 2076 Func != FuncEnd; ++Func) { 2077 if (isa<FunctionDecl>(*Func) && 2078 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 2079 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 2080 } 2081 2082 PrevDecl = 0; 2083 } 2084 2085 // Handle attributes. We need to have merged decls when handling attributes 2086 // (for example to check for conflicts, etc). 2087 ProcessDeclAttributes(NewFD, D); 2088 AddKnownFunctionAttributes(NewFD); 2089 2090 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 2091 // If a function name is overloadable in C, then every function 2092 // with that name must be marked "overloadable". 2093 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 2094 << Redeclaration << NewFD; 2095 if (PrevDecl) 2096 Diag(PrevDecl->getLocation(), 2097 diag::note_attribute_overloadable_prev_overload); 2098 NewFD->addAttr(::new (Context) OverloadableAttr()); 2099 } 2100 2101 if (getLangOptions().CPlusPlus) { 2102 // In C++, check default arguments now that we have merged decls. Unless 2103 // the lexical context is the class, because in this case this is done 2104 // during delayed parsing anyway. 2105 if (!CurContext->isRecord()) 2106 CheckCXXDefaultArguments(NewFD); 2107 2108 // An out-of-line member function declaration must also be a 2109 // definition (C++ [dcl.meaning]p1). 2110 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && !InvalidDecl) { 2111 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2112 << D.getCXXScopeSpec().getRange(); 2113 InvalidDecl = true; 2114 } 2115 } 2116 2117 // If this is a locally-scoped extern C function, update the 2118 // map of such names. 2119 if (CurContext->isFunctionOrMethod() && NewFD->isExternC(Context) 2120 && !InvalidDecl) 2121 RegisterLocallyScopedExternCDecl(NewFD, PrevDecl, S); 2122 2123 return NewFD; 2124} 2125 2126bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 2127 // FIXME: Need strict checking. In C89, we need to check for 2128 // any assignment, increment, decrement, function-calls, or 2129 // commas outside of a sizeof. In C99, it's the same list, 2130 // except that the aforementioned are allowed in unevaluated 2131 // expressions. Everything else falls under the 2132 // "may accept other forms of constant expressions" exception. 2133 // (We never end up here for C++, so the constant expression 2134 // rules there don't matter.) 2135 if (Init->isConstantInitializer(Context)) 2136 return false; 2137 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 2138 << Init->getSourceRange(); 2139 return true; 2140} 2141 2142void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init) { 2143 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 2144} 2145 2146/// AddInitializerToDecl - Adds the initializer Init to the 2147/// declaration dcl. If DirectInit is true, this is C++ direct 2148/// initialization rather than copy initialization. 2149void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init, bool DirectInit) { 2150 Decl *RealDecl = static_cast<Decl *>(dcl); 2151 // If there is no declaration, there was an error parsing it. Just ignore 2152 // the initializer. 2153 if (RealDecl == 0) 2154 return; 2155 2156 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 2157 // With declarators parsed the way they are, the parser cannot 2158 // distinguish between a normal initializer and a pure-specifier. 2159 // Thus this grotesque test. 2160 IntegerLiteral *IL; 2161 Expr *Init = static_cast<Expr *>(init.get()); 2162 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 2163 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 2164 if (Method->isVirtual()) 2165 Method->setPure(); 2166 else { 2167 Diag(Method->getLocation(), diag::err_non_virtual_pure) 2168 << Method->getDeclName() << Init->getSourceRange(); 2169 Method->setInvalidDecl(); 2170 } 2171 } else { 2172 Diag(Method->getLocation(), diag::err_member_function_initialization) 2173 << Method->getDeclName() << Init->getSourceRange(); 2174 Method->setInvalidDecl(); 2175 } 2176 return; 2177 } 2178 2179 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2180 if (!VDecl) { 2181 if (getLangOptions().CPlusPlus && 2182 RealDecl->getLexicalDeclContext()->isRecord() && 2183 isa<NamedDecl>(RealDecl)) 2184 Diag(RealDecl->getLocation(), diag::err_member_initialization) 2185 << cast<NamedDecl>(RealDecl)->getDeclName(); 2186 else 2187 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2188 RealDecl->setInvalidDecl(); 2189 return; 2190 } 2191 2192 const VarDecl *Def = 0; 2193 if (VDecl->getDefinition(Def)) { 2194 Diag(VDecl->getLocation(), diag::err_redefinition) 2195 << VDecl->getDeclName(); 2196 Diag(Def->getLocation(), diag::note_previous_definition); 2197 VDecl->setInvalidDecl(); 2198 return; 2199 } 2200 2201 // Take ownership of the expression, now that we're sure we have somewhere 2202 // to put it. 2203 Expr *Init = static_cast<Expr *>(init.release()); 2204 assert(Init && "missing initializer"); 2205 2206 // Get the decls type and save a reference for later, since 2207 // CheckInitializerTypes may change it. 2208 QualType DclT = VDecl->getType(), SavT = DclT; 2209 if (VDecl->isBlockVarDecl()) { 2210 VarDecl::StorageClass SC = VDecl->getStorageClass(); 2211 if (SC == VarDecl::Extern) { // C99 6.7.8p5 2212 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2213 VDecl->setInvalidDecl(); 2214 } else if (!VDecl->isInvalidDecl()) { 2215 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2216 VDecl->getDeclName(), DirectInit)) 2217 VDecl->setInvalidDecl(); 2218 2219 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2220 // Don't check invalid declarations to avoid emitting useless diagnostics. 2221 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2222 if (SC == VarDecl::Static) // C99 6.7.8p4. 2223 CheckForConstantInitializer(Init, DclT); 2224 } 2225 } 2226 } else if (VDecl->isStaticDataMember() && 2227 VDecl->getLexicalDeclContext()->isRecord()) { 2228 // This is an in-class initialization for a static data member, e.g., 2229 // 2230 // struct S { 2231 // static const int value = 17; 2232 // }; 2233 2234 // Attach the initializer 2235 VDecl->setInit(Init); 2236 2237 // C++ [class.mem]p4: 2238 // A member-declarator can contain a constant-initializer only 2239 // if it declares a static member (9.4) of const integral or 2240 // const enumeration type, see 9.4.2. 2241 QualType T = VDecl->getType(); 2242 if (!T->isDependentType() && 2243 (!Context.getCanonicalType(T).isConstQualified() || 2244 !T->isIntegralType())) { 2245 Diag(VDecl->getLocation(), diag::err_member_initialization) 2246 << VDecl->getDeclName() << Init->getSourceRange(); 2247 VDecl->setInvalidDecl(); 2248 } else { 2249 // C++ [class.static.data]p4: 2250 // If a static data member is of const integral or const 2251 // enumeration type, its declaration in the class definition 2252 // can specify a constant-initializer which shall be an 2253 // integral constant expression (5.19). 2254 if (!Init->isTypeDependent() && 2255 !Init->getType()->isIntegralType()) { 2256 // We have a non-dependent, non-integral or enumeration type. 2257 Diag(Init->getSourceRange().getBegin(), 2258 diag::err_in_class_initializer_non_integral_type) 2259 << Init->getType() << Init->getSourceRange(); 2260 VDecl->setInvalidDecl(); 2261 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 2262 // Check whether the expression is a constant expression. 2263 llvm::APSInt Value; 2264 SourceLocation Loc; 2265 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 2266 Diag(Loc, diag::err_in_class_initializer_non_constant) 2267 << Init->getSourceRange(); 2268 VDecl->setInvalidDecl(); 2269 } 2270 } 2271 } 2272 } else if (VDecl->isFileVarDecl()) { 2273 if (VDecl->getStorageClass() == VarDecl::Extern) 2274 Diag(VDecl->getLocation(), diag::warn_extern_init); 2275 if (!VDecl->isInvalidDecl()) 2276 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2277 VDecl->getDeclName(), DirectInit)) 2278 VDecl->setInvalidDecl(); 2279 2280 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2281 // Don't check invalid declarations to avoid emitting useless diagnostics. 2282 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2283 // C99 6.7.8p4. All file scoped initializers need to be constant. 2284 CheckForConstantInitializer(Init, DclT); 2285 } 2286 } 2287 // If the type changed, it means we had an incomplete type that was 2288 // completed by the initializer. For example: 2289 // int ary[] = { 1, 3, 5 }; 2290 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2291 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2292 VDecl->setType(DclT); 2293 Init->setType(DclT); 2294 } 2295 2296 // Attach the initializer to the decl. 2297 VDecl->setInit(Init); 2298 return; 2299} 2300 2301void Sema::ActOnUninitializedDecl(DeclTy *dcl) { 2302 Decl *RealDecl = static_cast<Decl *>(dcl); 2303 2304 // If there is no declaration, there was an error parsing it. Just ignore it. 2305 if (RealDecl == 0) 2306 return; 2307 2308 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2309 QualType Type = Var->getType(); 2310 // C++ [dcl.init.ref]p3: 2311 // The initializer can be omitted for a reference only in a 2312 // parameter declaration (8.3.5), in the declaration of a 2313 // function return type, in the declaration of a class member 2314 // within its class declaration (9.2), and where the extern 2315 // specifier is explicitly used. 2316 if (Type->isReferenceType() && 2317 Var->getStorageClass() != VarDecl::Extern && 2318 Var->getStorageClass() != VarDecl::PrivateExtern) { 2319 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2320 << Var->getDeclName() 2321 << SourceRange(Var->getLocation(), Var->getLocation()); 2322 Var->setInvalidDecl(); 2323 return; 2324 } 2325 2326 // C++ [dcl.init]p9: 2327 // 2328 // If no initializer is specified for an object, and the object 2329 // is of (possibly cv-qualified) non-POD class type (or array 2330 // thereof), the object shall be default-initialized; if the 2331 // object is of const-qualified type, the underlying class type 2332 // shall have a user-declared default constructor. 2333 if (getLangOptions().CPlusPlus) { 2334 QualType InitType = Type; 2335 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2336 InitType = Array->getElementType(); 2337 if (Var->getStorageClass() != VarDecl::Extern && 2338 Var->getStorageClass() != VarDecl::PrivateExtern && 2339 InitType->isRecordType()) { 2340 const CXXConstructorDecl *Constructor = 0; 2341 if (!RequireCompleteType(Var->getLocation(), InitType, 2342 diag::err_invalid_incomplete_type_use)) 2343 Constructor 2344 = PerformInitializationByConstructor(InitType, 0, 0, 2345 Var->getLocation(), 2346 SourceRange(Var->getLocation(), 2347 Var->getLocation()), 2348 Var->getDeclName(), 2349 IK_Default); 2350 if (!Constructor) 2351 Var->setInvalidDecl(); 2352 } 2353 } 2354 2355#if 0 2356 // FIXME: Temporarily disabled because we are not properly parsing 2357 // linkage specifications on declarations, e.g., 2358 // 2359 // extern "C" const CGPoint CGPointerZero; 2360 // 2361 // C++ [dcl.init]p9: 2362 // 2363 // If no initializer is specified for an object, and the 2364 // object is of (possibly cv-qualified) non-POD class type (or 2365 // array thereof), the object shall be default-initialized; if 2366 // the object is of const-qualified type, the underlying class 2367 // type shall have a user-declared default 2368 // constructor. Otherwise, if no initializer is specified for 2369 // an object, the object and its subobjects, if any, have an 2370 // indeterminate initial value; if the object or any of its 2371 // subobjects are of const-qualified type, the program is 2372 // ill-formed. 2373 // 2374 // This isn't technically an error in C, so we don't diagnose it. 2375 // 2376 // FIXME: Actually perform the POD/user-defined default 2377 // constructor check. 2378 if (getLangOptions().CPlusPlus && 2379 Context.getCanonicalType(Type).isConstQualified() && 2380 Var->getStorageClass() != VarDecl::Extern) 2381 Diag(Var->getLocation(), diag::err_const_var_requires_init) 2382 << Var->getName() 2383 << SourceRange(Var->getLocation(), Var->getLocation()); 2384#endif 2385 } 2386} 2387 2388/// The declarators are chained together backwards, reverse the list. 2389Sema::DeclTy *Sema::FinalizeDeclaratorGroup(Scope *S, DeclTy *group) { 2390 // Often we have single declarators, handle them quickly. 2391 Decl *Group = static_cast<Decl*>(group); 2392 if (Group == 0) 2393 return 0; 2394 2395 Decl *NewGroup = 0; 2396 if (Group->getNextDeclarator() == 0) 2397 NewGroup = Group; 2398 else { // reverse the list. 2399 while (Group) { 2400 Decl *Next = Group->getNextDeclarator(); 2401 Group->setNextDeclarator(NewGroup); 2402 NewGroup = Group; 2403 Group = Next; 2404 } 2405 } 2406 // Perform semantic analysis that depends on having fully processed both 2407 // the declarator and initializer. 2408 for (Decl *ID = NewGroup; ID; ID = ID->getNextDeclarator()) { 2409 VarDecl *IDecl = dyn_cast<VarDecl>(ID); 2410 if (!IDecl) 2411 continue; 2412 QualType T = IDecl->getType(); 2413 2414 // Block scope. C99 6.7p7: If an identifier for an object is declared with 2415 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 2416 if (IDecl->isBlockVarDecl() && 2417 IDecl->getStorageClass() != VarDecl::Extern) { 2418 if (!IDecl->isInvalidDecl() && 2419 RequireCompleteType(IDecl->getLocation(), T, 2420 diag::err_typecheck_decl_incomplete_type)) 2421 IDecl->setInvalidDecl(); 2422 } 2423 // File scope. C99 6.9.2p2: A declaration of an identifier for and 2424 // object that has file scope without an initializer, and without a 2425 // storage-class specifier or with the storage-class specifier "static", 2426 // constitutes a tentative definition. Note: A tentative definition with 2427 // external linkage is valid (C99 6.2.2p5). 2428 if (IDecl->isTentativeDefinition(Context)) { 2429 QualType CheckType = T; 2430 unsigned DiagID = diag::err_typecheck_decl_incomplete_type; 2431 2432 const IncompleteArrayType *ArrayT = Context.getAsIncompleteArrayType(T); 2433 if (ArrayT) { 2434 CheckType = ArrayT->getElementType(); 2435 DiagID = diag::err_illegal_decl_array_incomplete_type; 2436 } 2437 2438 if (IDecl->isInvalidDecl()) { 2439 // Do nothing with invalid declarations 2440 } else if ((ArrayT || IDecl->getStorageClass() == VarDecl::Static) && 2441 RequireCompleteType(IDecl->getLocation(), CheckType, DiagID)) { 2442 // C99 6.9.2p3: If the declaration of an identifier for an object is 2443 // a tentative definition and has internal linkage (C99 6.2.2p3), the 2444 // declared type shall not be an incomplete type. 2445 IDecl->setInvalidDecl(); 2446 } 2447 } 2448 } 2449 return NewGroup; 2450} 2451 2452/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 2453/// to introduce parameters into function prototype scope. 2454Sema::DeclTy * 2455Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 2456 const DeclSpec &DS = D.getDeclSpec(); 2457 2458 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 2459 VarDecl::StorageClass StorageClass = VarDecl::None; 2460 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2461 StorageClass = VarDecl::Register; 2462 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2463 Diag(DS.getStorageClassSpecLoc(), 2464 diag::err_invalid_storage_class_in_func_decl); 2465 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2466 } 2467 if (DS.isThreadSpecified()) { 2468 Diag(DS.getThreadSpecLoc(), 2469 diag::err_invalid_storage_class_in_func_decl); 2470 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2471 } 2472 2473 // Check that there are no default arguments inside the type of this 2474 // parameter (C++ only). 2475 if (getLangOptions().CPlusPlus) 2476 CheckExtraCXXDefaultArguments(D); 2477 2478 // In this context, we *do not* check D.getInvalidType(). If the declarator 2479 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 2480 // though it will not reflect the user specified type. 2481 QualType parmDeclType = GetTypeForDeclarator(D, S); 2482 2483 assert(!parmDeclType.isNull() && "GetTypeForDeclarator() returned null type"); 2484 2485 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 2486 // Can this happen for params? We already checked that they don't conflict 2487 // among each other. Here they can only shadow globals, which is ok. 2488 IdentifierInfo *II = D.getIdentifier(); 2489 if (II) { 2490 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2491 if (PrevDecl->isTemplateParameter()) { 2492 // Maybe we will complain about the shadowed template parameter. 2493 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2494 // Just pretend that we didn't see the previous declaration. 2495 PrevDecl = 0; 2496 } else if (S->isDeclScope(PrevDecl)) { 2497 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 2498 2499 // Recover by removing the name 2500 II = 0; 2501 D.SetIdentifier(0, D.getIdentifierLoc()); 2502 } 2503 } 2504 } 2505 2506 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 2507 // Doing the promotion here has a win and a loss. The win is the type for 2508 // both Decl's and DeclRefExpr's will match (a convenient invariant for the 2509 // code generator). The loss is the orginal type isn't preserved. For example: 2510 // 2511 // void func(int parmvardecl[5]) { // convert "int [5]" to "int *" 2512 // int blockvardecl[5]; 2513 // sizeof(parmvardecl); // size == 4 2514 // sizeof(blockvardecl); // size == 20 2515 // } 2516 // 2517 // For expressions, all implicit conversions are captured using the 2518 // ImplicitCastExpr AST node (we have no such mechanism for Decl's). 2519 // 2520 // FIXME: If a source translation tool needs to see the original type, then 2521 // we need to consider storing both types (in ParmVarDecl)... 2522 // 2523 if (parmDeclType->isArrayType()) { 2524 // int x[restrict 4] -> int *restrict 2525 parmDeclType = Context.getArrayDecayedType(parmDeclType); 2526 } else if (parmDeclType->isFunctionType()) 2527 parmDeclType = Context.getPointerType(parmDeclType); 2528 2529 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, 2530 D.getIdentifierLoc(), II, 2531 parmDeclType, StorageClass, 2532 0); 2533 2534 if (D.getInvalidType()) 2535 New->setInvalidDecl(); 2536 2537 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 2538 if (D.getCXXScopeSpec().isSet()) { 2539 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 2540 << D.getCXXScopeSpec().getRange(); 2541 New->setInvalidDecl(); 2542 } 2543 // Parameter declarators cannot be interface types. All ObjC objects are 2544 // passed by reference. 2545 if (parmDeclType->isObjCInterfaceType()) { 2546 Diag(D.getIdentifierLoc(), diag::err_object_cannot_be_by_value) 2547 << "passed"; 2548 New->setInvalidDecl(); 2549 } 2550 2551 // Add the parameter declaration into this scope. 2552 S->AddDecl(New); 2553 if (II) 2554 IdResolver.AddDecl(New); 2555 2556 ProcessDeclAttributes(New, D); 2557 return New; 2558 2559} 2560 2561void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D) { 2562 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2563 "Not a function declarator!"); 2564 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2565 2566 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 2567 // for a K&R function. 2568 if (!FTI.hasPrototype) { 2569 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2570 if (FTI.ArgInfo[i].Param == 0) { 2571 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 2572 << FTI.ArgInfo[i].Ident; 2573 // Implicitly declare the argument as type 'int' for lack of a better 2574 // type. 2575 DeclSpec DS; 2576 const char* PrevSpec; // unused 2577 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 2578 PrevSpec); 2579 Declarator ParamD(DS, Declarator::KNRTypeListContext); 2580 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 2581 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 2582 } 2583 } 2584 } 2585} 2586 2587Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 2588 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 2589 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2590 "Not a function declarator!"); 2591 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2592 2593 if (FTI.hasPrototype) { 2594 // FIXME: Diagnose arguments without names in C. 2595 } 2596 2597 Scope *ParentScope = FnBodyScope->getParent(); 2598 2599 return ActOnStartOfFunctionDef(FnBodyScope, 2600 ActOnDeclarator(ParentScope, D, 0, 2601 /*IsFunctionDefinition=*/true)); 2602} 2603 2604Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclTy *D) { 2605 Decl *decl = static_cast<Decl*>(D); 2606 FunctionDecl *FD = cast<FunctionDecl>(decl); 2607 2608 ActiveScope = FnBodyScope; 2609 2610 // See if this is a redefinition. 2611 const FunctionDecl *Definition; 2612 if (FD->getBody(Definition)) { 2613 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 2614 Diag(Definition->getLocation(), diag::note_previous_definition); 2615 } 2616 2617 // Builtin functions cannot be defined. 2618 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 2619 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2620 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 2621 FD->setInvalidDecl(); 2622 } 2623 } 2624 2625 // The return type of a function definition must be complete 2626 // (C99 6.9.1p3) 2627 if (FD->getResultType()->isIncompleteType() && 2628 !FD->getResultType()->isVoidType()) { 2629 Diag(FD->getLocation(), diag::err_func_def_incomplete_result) << FD; 2630 FD->setInvalidDecl(); 2631 } 2632 2633 PushDeclContext(FnBodyScope, FD); 2634 2635 // Check the validity of our function parameters 2636 CheckParmsForFunctionDef(FD); 2637 2638 // Introduce our parameters into the function scope 2639 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 2640 ParmVarDecl *Param = FD->getParamDecl(p); 2641 Param->setOwningFunction(FD); 2642 2643 // If this has an identifier, add it to the scope stack. 2644 if (Param->getIdentifier()) 2645 PushOnScopeChains(Param, FnBodyScope); 2646 } 2647 2648 // Checking attributes of current function definition 2649 // dllimport attribute. 2650 if (FD->getAttr<DLLImportAttr>() && (!FD->getAttr<DLLExportAttr>())) { 2651 // dllimport attribute cannot be applied to definition. 2652 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 2653 Diag(FD->getLocation(), 2654 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 2655 << "dllimport"; 2656 FD->setInvalidDecl(); 2657 return FD; 2658 } else { 2659 // If a symbol previously declared dllimport is later defined, the 2660 // attribute is ignored in subsequent references, and a warning is 2661 // emitted. 2662 Diag(FD->getLocation(), 2663 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 2664 << FD->getNameAsCString() << "dllimport"; 2665 } 2666 } 2667 return FD; 2668} 2669 2670static bool StatementCreatesScope(Stmt* S) { 2671 bool result = false; 2672 if (DeclStmt* DS = dyn_cast<DeclStmt>(S)) { 2673 for (DeclStmt::decl_iterator i = DS->decl_begin(); 2674 i != DS->decl_end(); ++i) { 2675 if (VarDecl* D = dyn_cast<VarDecl>(*i)) { 2676 result |= D->getType()->isVariablyModifiedType(); 2677 result |= !!D->getAttr<CleanupAttr>(); 2678 } else if (TypedefDecl* D = dyn_cast<TypedefDecl>(*i)) { 2679 result |= D->getUnderlyingType()->isVariablyModifiedType(); 2680 } 2681 } 2682 } 2683 2684 return result; 2685} 2686 2687void Sema::RecursiveCalcLabelScopes(llvm::DenseMap<Stmt*, void*>& LabelScopeMap, 2688 llvm::DenseMap<void*, Stmt*>& PopScopeMap, 2689 std::vector<void*>& ScopeStack, 2690 Stmt* CurStmt, 2691 Stmt* ParentCompoundStmt) { 2692 for (Stmt::child_iterator i = CurStmt->child_begin(); 2693 i != CurStmt->child_end(); ++i) { 2694 if (!*i) continue; 2695 if (StatementCreatesScope(*i)) { 2696 ScopeStack.push_back(*i); 2697 PopScopeMap[*i] = ParentCompoundStmt; 2698 } else if (isa<LabelStmt>(CurStmt)) { 2699 LabelScopeMap[CurStmt] = ScopeStack.size() ? ScopeStack.back() : 0; 2700 } 2701 if (isa<DeclStmt>(*i)) continue; 2702 Stmt* CurCompound = isa<CompoundStmt>(*i) ? *i : ParentCompoundStmt; 2703 RecursiveCalcLabelScopes(LabelScopeMap, PopScopeMap, ScopeStack, 2704 *i, CurCompound); 2705 } 2706 2707 while (ScopeStack.size() && PopScopeMap[ScopeStack.back()] == CurStmt) { 2708 ScopeStack.pop_back(); 2709 } 2710} 2711 2712void Sema::RecursiveCalcJumpScopes(llvm::DenseMap<Stmt*, void*>& LabelScopeMap, 2713 llvm::DenseMap<void*, Stmt*>& PopScopeMap, 2714 llvm::DenseMap<Stmt*, void*>& GotoScopeMap, 2715 std::vector<void*>& ScopeStack, 2716 Stmt* CurStmt) { 2717 for (Stmt::child_iterator i = CurStmt->child_begin(); 2718 i != CurStmt->child_end(); ++i) { 2719 if (!*i) continue; 2720 if (StatementCreatesScope(*i)) { 2721 ScopeStack.push_back(*i); 2722 } else if (GotoStmt* GS = dyn_cast<GotoStmt>(*i)) { 2723 void* LScope = LabelScopeMap[GS->getLabel()]; 2724 if (LScope) { 2725 bool foundScopeInStack = false; 2726 for (unsigned i = ScopeStack.size(); i > 0; --i) { 2727 if (LScope == ScopeStack[i-1]) { 2728 foundScopeInStack = true; 2729 break; 2730 } 2731 } 2732 if (!foundScopeInStack) { 2733 Diag(GS->getSourceRange().getBegin(), diag::err_goto_into_scope); 2734 } 2735 } 2736 } 2737 if (isa<DeclStmt>(*i)) continue; 2738 RecursiveCalcJumpScopes(LabelScopeMap, PopScopeMap, GotoScopeMap, 2739 ScopeStack, *i); 2740 } 2741 2742 while (ScopeStack.size() && PopScopeMap[ScopeStack.back()] == CurStmt) { 2743 ScopeStack.pop_back(); 2744 } 2745} 2746 2747Sema::DeclTy *Sema::ActOnFinishFunctionBody(DeclTy *D, StmtArg BodyArg) { 2748 Decl *dcl = static_cast<Decl *>(D); 2749 Stmt *Body = static_cast<Stmt*>(BodyArg.release()); 2750 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 2751 FD->setBody(Body); 2752 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 2753 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 2754 assert(MD == getCurMethodDecl() && "Method parsing confused"); 2755 MD->setBody((Stmt*)Body); 2756 } else { 2757 Body->Destroy(Context); 2758 return 0; 2759 } 2760 PopDeclContext(); 2761 2762 // FIXME: Temporary hack to workaround nested C++ functions. For example: 2763 // class C2 { 2764 // void f() { 2765 // class LC1 { 2766 // int m() { return 1; } 2767 // }; 2768 // } 2769 // }; 2770 if (ActiveScope == 0) 2771 return D; 2772 2773 // Verify and clean out per-function state. 2774 2775 bool HaveLabels = !ActiveScope->LabelMap.empty(); 2776 // Check goto/label use. 2777 for (Scope::LabelMapTy::iterator I = ActiveScope->LabelMap.begin(), 2778 E = ActiveScope->LabelMap.end(); I != E; ++I) { 2779 // Verify that we have no forward references left. If so, there was a goto 2780 // or address of a label taken, but no definition of it. Label fwd 2781 // definitions are indicated with a null substmt. 2782 LabelStmt *L = static_cast<LabelStmt*>(I->second); 2783 if (L->getSubStmt() == 0) { 2784 // Emit error. 2785 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 2786 2787 // At this point, we have gotos that use the bogus label. Stitch it into 2788 // the function body so that they aren't leaked and that the AST is well 2789 // formed. 2790 if (Body) { 2791#if 0 2792 // FIXME: Why do this? Having a 'push_back' in CompoundStmt is ugly, 2793 // and the AST is malformed anyway. We should just blow away 'L'. 2794 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 2795 cast<CompoundStmt>(Body)->push_back(L); 2796#else 2797 L->Destroy(Context); 2798#endif 2799 } else { 2800 // The whole function wasn't parsed correctly, just delete this. 2801 L->Destroy(Context); 2802 } 2803 } 2804 } 2805 // This reset is for both functions and methods. 2806 ActiveScope = 0; 2807 2808 if (!Body) return D; 2809 2810 if (HaveLabels) { 2811 llvm::DenseMap<Stmt*, void*> LabelScopeMap; 2812 llvm::DenseMap<void*, Stmt*> PopScopeMap; 2813 llvm::DenseMap<Stmt*, void*> GotoScopeMap; 2814 std::vector<void*> ScopeStack; 2815 RecursiveCalcLabelScopes(LabelScopeMap, PopScopeMap, ScopeStack, Body, Body); 2816 RecursiveCalcJumpScopes(LabelScopeMap, PopScopeMap, GotoScopeMap, ScopeStack, Body); 2817 } 2818 2819 return D; 2820} 2821 2822/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 2823/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 2824NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 2825 IdentifierInfo &II, Scope *S) { 2826 // Before we produce a declaration for an implicitly defined 2827 // function, see whether there was a locally-scoped declaration of 2828 // this name as a function or variable. If so, use that 2829 // (non-visible) declaration, and complain about it. 2830 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2831 = LocallyScopedExternalDecls.find(&II); 2832 if (Pos != LocallyScopedExternalDecls.end()) { 2833 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 2834 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 2835 return Pos->second; 2836 } 2837 2838 // Extension in C99. Legal in C90, but warn about it. 2839 if (getLangOptions().C99) 2840 Diag(Loc, diag::ext_implicit_function_decl) << &II; 2841 else 2842 Diag(Loc, diag::warn_implicit_function_decl) << &II; 2843 2844 // FIXME: handle stuff like: 2845 // void foo() { extern float X(); } 2846 // void bar() { X(); } <-- implicit decl for X in another scope. 2847 2848 // Set a Declarator for the implicit definition: int foo(); 2849 const char *Dummy; 2850 DeclSpec DS; 2851 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 2852 Error = Error; // Silence warning. 2853 assert(!Error && "Error setting up implicit decl!"); 2854 Declarator D(DS, Declarator::BlockContext); 2855 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 2856 0, 0, 0, Loc, D), 2857 SourceLocation()); 2858 D.SetIdentifier(&II, Loc); 2859 2860 // Insert this function into translation-unit scope. 2861 2862 DeclContext *PrevDC = CurContext; 2863 CurContext = Context.getTranslationUnitDecl(); 2864 2865 FunctionDecl *FD = 2866 dyn_cast<FunctionDecl>(static_cast<Decl*>(ActOnDeclarator(TUScope, D, 0))); 2867 FD->setImplicit(); 2868 2869 CurContext = PrevDC; 2870 2871 AddKnownFunctionAttributes(FD); 2872 2873 return FD; 2874} 2875 2876/// \brief Adds any function attributes that we know a priori based on 2877/// the declaration of this function. 2878/// 2879/// These attributes can apply both to implicitly-declared builtins 2880/// (like __builtin___printf_chk) or to library-declared functions 2881/// like NSLog or printf. 2882void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 2883 if (FD->isInvalidDecl()) 2884 return; 2885 2886 // If this is a built-in function, map its builtin attributes to 2887 // actual attributes. 2888 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 2889 // Handle printf-formatting attributes. 2890 unsigned FormatIdx; 2891 bool HasVAListArg; 2892 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 2893 if (!FD->getAttr<FormatAttr>()) 2894 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 2895 FormatIdx + 2)); 2896 } 2897 2898 // Mark const if we don't care about errno and that is the only 2899 // thing preventing the function from being const. This allows 2900 // IRgen to use LLVM intrinsics for such functions. 2901 if (!getLangOptions().MathErrno && 2902 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 2903 if (!FD->getAttr<ConstAttr>()) 2904 FD->addAttr(::new (Context) ConstAttr()); 2905 } 2906 } 2907 2908 IdentifierInfo *Name = FD->getIdentifier(); 2909 if (!Name) 2910 return; 2911 if ((!getLangOptions().CPlusPlus && 2912 FD->getDeclContext()->isTranslationUnit()) || 2913 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 2914 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 2915 LinkageSpecDecl::lang_c)) { 2916 // Okay: this could be a libc/libm/Objective-C function we know 2917 // about. 2918 } else 2919 return; 2920 2921 unsigned KnownID; 2922 for (KnownID = 0; KnownID != id_num_known_functions; ++KnownID) 2923 if (KnownFunctionIDs[KnownID] == Name) 2924 break; 2925 2926 switch (KnownID) { 2927 case id_NSLog: 2928 case id_NSLogv: 2929 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 2930 // FIXME: We known better than our headers. 2931 const_cast<FormatAttr *>(Format)->setType("printf"); 2932 } else 2933 FD->addAttr(::new (Context) FormatAttr("printf", 1, 2)); 2934 break; 2935 2936 case id_asprintf: 2937 case id_vasprintf: 2938 if (!FD->getAttr<FormatAttr>()) 2939 FD->addAttr(::new (Context) FormatAttr("printf", 2, 3)); 2940 break; 2941 2942 default: 2943 // Unknown function or known function without any attributes to 2944 // add. Do nothing. 2945 break; 2946 } 2947} 2948 2949TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 2950 Decl *LastDeclarator) { 2951 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 2952 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 2953 2954 // Scope manipulation handled by caller. 2955 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 2956 D.getIdentifierLoc(), 2957 D.getIdentifier(), 2958 T); 2959 2960 if (TagType *TT = dyn_cast<TagType>(T)) { 2961 TagDecl *TD = TT->getDecl(); 2962 2963 // If the TagDecl that the TypedefDecl points to is an anonymous decl 2964 // keep track of the TypedefDecl. 2965 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 2966 TD->setTypedefForAnonDecl(NewTD); 2967 } 2968 2969 NewTD->setNextDeclarator(LastDeclarator); 2970 if (D.getInvalidType()) 2971 NewTD->setInvalidDecl(); 2972 return NewTD; 2973} 2974 2975/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 2976/// former case, Name will be non-null. In the later case, Name will be null. 2977/// TagSpec indicates what kind of tag this is. TK indicates whether this is a 2978/// reference/declaration/definition of a tag. 2979Sema::DeclTy *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, 2980 SourceLocation KWLoc, const CXXScopeSpec &SS, 2981 IdentifierInfo *Name, SourceLocation NameLoc, 2982 AttributeList *Attr) { 2983 // If this is not a definition, it must have a name. 2984 assert((Name != 0 || TK == TK_Definition) && 2985 "Nameless record must be a definition!"); 2986 2987 TagDecl::TagKind Kind; 2988 switch (TagSpec) { 2989 default: assert(0 && "Unknown tag type!"); 2990 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 2991 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 2992 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 2993 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 2994 } 2995 2996 DeclContext *SearchDC = CurContext; 2997 DeclContext *DC = CurContext; 2998 NamedDecl *PrevDecl = 0; 2999 3000 bool Invalid = false; 3001 3002 if (Name && SS.isNotEmpty()) { 3003 // We have a nested-name tag ('struct foo::bar'). 3004 3005 // Check for invalid 'foo::'. 3006 if (SS.isInvalid()) { 3007 Name = 0; 3008 goto CreateNewDecl; 3009 } 3010 3011 // FIXME: RequireCompleteDeclContext(SS)? 3012 DC = static_cast<DeclContext*>(SS.getScopeRep()); 3013 SearchDC = DC; 3014 // Look-up name inside 'foo::'. 3015 PrevDecl = dyn_cast_or_null<TagDecl>( 3016 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 3017 3018 // A tag 'foo::bar' must already exist. 3019 if (PrevDecl == 0) { 3020 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 3021 Name = 0; 3022 goto CreateNewDecl; 3023 } 3024 } else if (Name) { 3025 // If this is a named struct, check to see if there was a previous forward 3026 // declaration or definition. 3027 // FIXME: We're looking into outer scopes here, even when we 3028 // shouldn't be. Doing so can result in ambiguities that we 3029 // shouldn't be diagnosing. 3030 LookupResult R = LookupName(S, Name, LookupTagName, 3031 /*RedeclarationOnly=*/(TK != TK_Reference)); 3032 if (R.isAmbiguous()) { 3033 DiagnoseAmbiguousLookup(R, Name, NameLoc); 3034 // FIXME: This is not best way to recover from case like: 3035 // 3036 // struct S s; 3037 // 3038 // causes needless err_ovl_no_viable_function_in_init latter. 3039 Name = 0; 3040 PrevDecl = 0; 3041 Invalid = true; 3042 } 3043 else 3044 PrevDecl = R; 3045 3046 if (!getLangOptions().CPlusPlus && TK != TK_Reference) { 3047 // FIXME: This makes sure that we ignore the contexts associated 3048 // with C structs, unions, and enums when looking for a matching 3049 // tag declaration or definition. See the similar lookup tweak 3050 // in Sema::LookupName; is there a better way to deal with this? 3051 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 3052 SearchDC = SearchDC->getParent(); 3053 } 3054 } 3055 3056 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3057 // Maybe we will complain about the shadowed template parameter. 3058 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 3059 // Just pretend that we didn't see the previous declaration. 3060 PrevDecl = 0; 3061 } 3062 3063 if (PrevDecl) { 3064 // Check whether the previous declaration is usable. 3065 (void)DiagnoseUseOfDecl(PrevDecl, NameLoc); 3066 3067 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 3068 // If this is a use of a previous tag, or if the tag is already declared 3069 // in the same scope (so that the definition/declaration completes or 3070 // rementions the tag), reuse the decl. 3071 if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { 3072 // Make sure that this wasn't declared as an enum and now used as a 3073 // struct or something similar. 3074 if (PrevTagDecl->getTagKind() != Kind) { 3075 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 3076 Diag(PrevDecl->getLocation(), diag::note_previous_use); 3077 // Recover by making this an anonymous redefinition. 3078 Name = 0; 3079 PrevDecl = 0; 3080 Invalid = true; 3081 } else { 3082 // If this is a use, just return the declaration we found. 3083 3084 // FIXME: In the future, return a variant or some other clue 3085 // for the consumer of this Decl to know it doesn't own it. 3086 // For our current ASTs this shouldn't be a problem, but will 3087 // need to be changed with DeclGroups. 3088 if (TK == TK_Reference) 3089 return PrevDecl; 3090 3091 // Diagnose attempts to redefine a tag. 3092 if (TK == TK_Definition) { 3093 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 3094 Diag(NameLoc, diag::err_redefinition) << Name; 3095 Diag(Def->getLocation(), diag::note_previous_definition); 3096 // If this is a redefinition, recover by making this 3097 // struct be anonymous, which will make any later 3098 // references get the previous definition. 3099 Name = 0; 3100 PrevDecl = 0; 3101 Invalid = true; 3102 } else { 3103 // If the type is currently being defined, complain 3104 // about a nested redefinition. 3105 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 3106 if (Tag->isBeingDefined()) { 3107 Diag(NameLoc, diag::err_nested_redefinition) << Name; 3108 Diag(PrevTagDecl->getLocation(), 3109 diag::note_previous_definition); 3110 Name = 0; 3111 PrevDecl = 0; 3112 Invalid = true; 3113 } 3114 } 3115 3116 // Okay, this is definition of a previously declared or referenced 3117 // tag PrevDecl. We're going to create a new Decl for it. 3118 } 3119 } 3120 // If we get here we have (another) forward declaration or we 3121 // have a definition. Just create a new decl. 3122 } else { 3123 // If we get here, this is a definition of a new tag type in a nested 3124 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 3125 // new decl/type. We set PrevDecl to NULL so that the entities 3126 // have distinct types. 3127 PrevDecl = 0; 3128 } 3129 // If we get here, we're going to create a new Decl. If PrevDecl 3130 // is non-NULL, it's a definition of the tag declared by 3131 // PrevDecl. If it's NULL, we have a new definition. 3132 } else { 3133 // PrevDecl is a namespace, template, or anything else 3134 // that lives in the IDNS_Tag identifier namespace. 3135 if (isDeclInScope(PrevDecl, SearchDC, S)) { 3136 // The tag name clashes with a namespace name, issue an error and 3137 // recover by making this tag be anonymous. 3138 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 3139 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3140 Name = 0; 3141 PrevDecl = 0; 3142 Invalid = true; 3143 } else { 3144 // The existing declaration isn't relevant to us; we're in a 3145 // new scope, so clear out the previous declaration. 3146 PrevDecl = 0; 3147 } 3148 } 3149 } else if (TK == TK_Reference && SS.isEmpty() && Name && 3150 (Kind != TagDecl::TK_enum || !getLangOptions().CPlusPlus)) { 3151 // C.scope.pdecl]p5: 3152 // -- for an elaborated-type-specifier of the form 3153 // 3154 // class-key identifier 3155 // 3156 // if the elaborated-type-specifier is used in the 3157 // decl-specifier-seq or parameter-declaration-clause of a 3158 // function defined in namespace scope, the identifier is 3159 // declared as a class-name in the namespace that contains 3160 // the declaration; otherwise, except as a friend 3161 // declaration, the identifier is declared in the smallest 3162 // non-class, non-function-prototype scope that contains the 3163 // declaration. 3164 // 3165 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 3166 // C structs and unions. 3167 // 3168 // GNU C also supports this behavior as part of its incomplete 3169 // enum types extension, while GNU C++ does not. 3170 // 3171 // Find the context where we'll be declaring the tag. 3172 // FIXME: We would like to maintain the current DeclContext as the 3173 // lexical context, 3174 while (SearchDC->isRecord()) 3175 SearchDC = SearchDC->getParent(); 3176 3177 // Find the scope where we'll be declaring the tag. 3178 while (S->isClassScope() || 3179 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 3180 ((S->getFlags() & Scope::DeclScope) == 0) || 3181 (S->getEntity() && 3182 ((DeclContext *)S->getEntity())->isTransparentContext())) 3183 S = S->getParent(); 3184 } 3185 3186CreateNewDecl: 3187 3188 // If there is an identifier, use the location of the identifier as the 3189 // location of the decl, otherwise use the location of the struct/union 3190 // keyword. 3191 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 3192 3193 // Otherwise, create a new declaration. If there is a previous 3194 // declaration of the same entity, the two will be linked via 3195 // PrevDecl. 3196 TagDecl *New; 3197 3198 if (Kind == TagDecl::TK_enum) { 3199 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3200 // enum X { A, B, C } D; D should chain to X. 3201 New = EnumDecl::Create(Context, SearchDC, Loc, Name, 3202 cast_or_null<EnumDecl>(PrevDecl)); 3203 // If this is an undefined enum, warn. 3204 if (TK != TK_Definition && !Invalid) { 3205 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 3206 : diag::ext_forward_ref_enum; 3207 Diag(Loc, DK); 3208 } 3209 } else { 3210 // struct/union/class 3211 3212 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3213 // struct X { int A; } D; D should chain to X. 3214 if (getLangOptions().CPlusPlus) 3215 // FIXME: Look for a way to use RecordDecl for simple structs. 3216 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3217 cast_or_null<CXXRecordDecl>(PrevDecl)); 3218 else 3219 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3220 cast_or_null<RecordDecl>(PrevDecl)); 3221 } 3222 3223 if (Kind != TagDecl::TK_enum) { 3224 // Handle #pragma pack: if the #pragma pack stack has non-default 3225 // alignment, make up a packed attribute for this decl. These 3226 // attributes are checked when the ASTContext lays out the 3227 // structure. 3228 // 3229 // It is important for implementing the correct semantics that this 3230 // happen here (in act on tag decl). The #pragma pack stack is 3231 // maintained as a result of parser callbacks which can occur at 3232 // many points during the parsing of a struct declaration (because 3233 // the #pragma tokens are effectively skipped over during the 3234 // parsing of the struct). 3235 if (unsigned Alignment = getPragmaPackAlignment()) 3236 New->addAttr(::new (Context) PackedAttr(Alignment * 8)); 3237 } 3238 3239 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 3240 // C++ [dcl.typedef]p3: 3241 // [...] Similarly, in a given scope, a class or enumeration 3242 // shall not be declared with the same name as a typedef-name 3243 // that is declared in that scope and refers to a type other 3244 // than the class or enumeration itself. 3245 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 3246 TypedefDecl *PrevTypedef = 0; 3247 if (Lookup.getKind() == LookupResult::Found) 3248 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 3249 3250 if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && 3251 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 3252 Context.getCanonicalType(Context.getTypeDeclType(New))) { 3253 Diag(Loc, diag::err_tag_definition_of_typedef) 3254 << Context.getTypeDeclType(New) 3255 << PrevTypedef->getUnderlyingType(); 3256 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 3257 Invalid = true; 3258 } 3259 } 3260 3261 if (Invalid) 3262 New->setInvalidDecl(); 3263 3264 if (Attr) 3265 ProcessDeclAttributeList(New, Attr); 3266 3267 // If we're declaring or defining a tag in function prototype scope 3268 // in C, note that this type can only be used within the function. 3269 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 3270 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 3271 3272 // Set the lexical context. If the tag has a C++ scope specifier, the 3273 // lexical context will be different from the semantic context. 3274 New->setLexicalDeclContext(CurContext); 3275 3276 if (TK == TK_Definition) 3277 New->startDefinition(); 3278 3279 // If this has an identifier, add it to the scope stack. 3280 if (Name) { 3281 S = getNonFieldDeclScope(S); 3282 PushOnScopeChains(New, S); 3283 } else { 3284 CurContext->addDecl(New); 3285 } 3286 3287 return New; 3288} 3289 3290void Sema::ActOnTagStartDefinition(Scope *S, DeclTy *TagD) { 3291 AdjustDeclIfTemplate(TagD); 3292 TagDecl *Tag = cast<TagDecl>((Decl *)TagD); 3293 3294 // Enter the tag context. 3295 PushDeclContext(S, Tag); 3296 3297 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 3298 FieldCollector->StartClass(); 3299 3300 if (Record->getIdentifier()) { 3301 // C++ [class]p2: 3302 // [...] The class-name is also inserted into the scope of the 3303 // class itself; this is known as the injected-class-name. For 3304 // purposes of access checking, the injected-class-name is treated 3305 // as if it were a public member name. 3306 RecordDecl *InjectedClassName 3307 = CXXRecordDecl::Create(Context, Record->getTagKind(), 3308 CurContext, Record->getLocation(), 3309 Record->getIdentifier(), Record); 3310 InjectedClassName->setImplicit(); 3311 PushOnScopeChains(InjectedClassName, S); 3312 } 3313 } 3314} 3315 3316void Sema::ActOnTagFinishDefinition(Scope *S, DeclTy *TagD) { 3317 AdjustDeclIfTemplate(TagD); 3318 TagDecl *Tag = cast<TagDecl>((Decl *)TagD); 3319 3320 if (isa<CXXRecordDecl>(Tag)) 3321 FieldCollector->FinishClass(); 3322 3323 // Exit this scope of this tag's definition. 3324 PopDeclContext(); 3325 3326 // Notify the consumer that we've defined a tag. 3327 Consumer.HandleTagDeclDefinition(Tag); 3328} 3329 3330bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 3331 QualType FieldTy, const Expr *BitWidth) { 3332 // C99 6.7.2.1p4 - verify the field type. 3333 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 3334 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 3335 // Handle incomplete types with specific error. 3336 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 3337 return true; 3338 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 3339 << FieldName << FieldTy << BitWidth->getSourceRange(); 3340 } 3341 3342 // If the bit-width is type- or value-dependent, don't try to check 3343 // it now. 3344 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 3345 return false; 3346 3347 llvm::APSInt Value; 3348 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 3349 return true; 3350 3351 // Zero-width bitfield is ok for anonymous field. 3352 if (Value == 0 && FieldName) 3353 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 3354 3355 if (Value.isNegative()) 3356 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) << FieldName; 3357 3358 if (!FieldTy->isDependentType()) { 3359 uint64_t TypeSize = Context.getTypeSize(FieldTy); 3360 // FIXME: We won't need the 0 size once we check that the field type is valid. 3361 if (TypeSize && Value.getZExtValue() > TypeSize) 3362 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 3363 << FieldName << (unsigned)TypeSize; 3364 } 3365 3366 return false; 3367} 3368 3369/// ActOnField - Each field of a struct/union/class is passed into this in order 3370/// to create a FieldDecl object for it. 3371Sema::DeclTy *Sema::ActOnField(Scope *S, DeclTy *TagD, 3372 SourceLocation DeclStart, 3373 Declarator &D, ExprTy *BitfieldWidth) { 3374 3375 return HandleField(S, static_cast<RecordDecl*>(TagD), DeclStart, D, 3376 static_cast<Expr*>(BitfieldWidth), 3377 AS_public); 3378} 3379 3380/// HandleField - Analyze a field of a C struct or a C++ data member. 3381/// 3382FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 3383 SourceLocation DeclStart, 3384 Declarator &D, Expr *BitWidth, 3385 AccessSpecifier AS) { 3386 IdentifierInfo *II = D.getIdentifier(); 3387 SourceLocation Loc = DeclStart; 3388 if (II) Loc = D.getIdentifierLoc(); 3389 3390 QualType T = GetTypeForDeclarator(D, S); 3391 3392 if (getLangOptions().CPlusPlus) { 3393 CheckExtraCXXDefaultArguments(D); 3394 3395 if (D.getDeclSpec().isVirtualSpecified()) 3396 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3397 diag::err_virtual_non_function); 3398 } 3399 3400 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3401 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 3402 PrevDecl = 0; 3403 3404 FieldDecl *NewFD 3405 = CheckFieldDecl(II, T, Record, Loc, 3406 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable, 3407 BitWidth, AS, PrevDecl, &D); 3408 if (NewFD->isInvalidDecl() && PrevDecl) { 3409 // Don't introduce NewFD into scope; there's already something 3410 // with the same name in the same scope. 3411 } else if (II) { 3412 PushOnScopeChains(NewFD, S); 3413 } else 3414 Record->addDecl(NewFD); 3415 3416 return NewFD; 3417} 3418 3419/// \brief Build a new FieldDecl and check its well-formedness. 3420/// 3421/// This routine builds a new FieldDecl given the fields name, type, 3422/// record, etc. \p PrevDecl should refer to any previous declaration 3423/// with the same name and in the same scope as the field to be 3424/// created. 3425/// 3426/// \returns a new FieldDecl. 3427/// 3428/// \todo The Declarator argument is a hack. It will be removed once 3429FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 3430 RecordDecl *Record, SourceLocation Loc, 3431 bool Mutable, Expr *BitWidth, 3432 AccessSpecifier AS, NamedDecl *PrevDecl, 3433 Declarator *D) { 3434 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3435 bool InvalidDecl = false; 3436 3437 // If we receive a broken type, recover by assuming 'int' and 3438 // marking this declaration as invalid. 3439 if (T.isNull()) { 3440 InvalidDecl = true; 3441 T = Context.IntTy; 3442 } 3443 3444 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3445 // than a variably modified type. 3446 if (T->isVariablyModifiedType()) { 3447 bool SizeIsNegative; 3448 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 3449 SizeIsNegative); 3450 if (!FixedTy.isNull()) { 3451 Diag(Loc, diag::warn_illegal_constant_array_size); 3452 T = FixedTy; 3453 } else { 3454 if (SizeIsNegative) 3455 Diag(Loc, diag::err_typecheck_negative_array_size); 3456 else 3457 Diag(Loc, diag::err_typecheck_field_variable_size); 3458 T = Context.IntTy; 3459 InvalidDecl = true; 3460 } 3461 } 3462 3463 // If this is declared as a bit-field, check the bit-field. 3464 if (BitWidth && VerifyBitField(Loc, II, T, BitWidth)) { 3465 InvalidDecl = true; 3466 DeleteExpr(BitWidth); 3467 BitWidth = 0; 3468 } 3469 3470 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, BitWidth, 3471 Mutable); 3472 3473 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 3474 Diag(Loc, diag::err_duplicate_member) << II; 3475 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3476 NewFD->setInvalidDecl(); 3477 Record->setInvalidDecl(); 3478 } 3479 3480 if (getLangOptions().CPlusPlus && !T->isPODType()) 3481 cast<CXXRecordDecl>(Record)->setPOD(false); 3482 3483 // FIXME: We need to pass in the attributes given an AST 3484 // representation, not a parser representation. 3485 if (D) 3486 ProcessDeclAttributes(NewFD, *D); 3487 3488 if (T.isObjCGCWeak()) 3489 Diag(Loc, diag::warn_attribute_weak_on_field); 3490 3491 if (InvalidDecl) 3492 NewFD->setInvalidDecl(); 3493 3494 NewFD->setAccess(AS); 3495 3496 // C++ [dcl.init.aggr]p1: 3497 // An aggregate is an array or a class (clause 9) with [...] no 3498 // private or protected non-static data members (clause 11). 3499 // A POD must be an aggregate. 3500 if (getLangOptions().CPlusPlus && 3501 (AS == AS_private || AS == AS_protected)) { 3502 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 3503 CXXRecord->setAggregate(false); 3504 CXXRecord->setPOD(false); 3505 } 3506 3507 return NewFD; 3508} 3509 3510/// TranslateIvarVisibility - Translate visibility from a token ID to an 3511/// AST enum value. 3512static ObjCIvarDecl::AccessControl 3513TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 3514 switch (ivarVisibility) { 3515 default: assert(0 && "Unknown visitibility kind"); 3516 case tok::objc_private: return ObjCIvarDecl::Private; 3517 case tok::objc_public: return ObjCIvarDecl::Public; 3518 case tok::objc_protected: return ObjCIvarDecl::Protected; 3519 case tok::objc_package: return ObjCIvarDecl::Package; 3520 } 3521} 3522 3523/// ActOnIvar - Each ivar field of an objective-c class is passed into this 3524/// in order to create an IvarDecl object for it. 3525Sema::DeclTy *Sema::ActOnIvar(Scope *S, 3526 SourceLocation DeclStart, 3527 Declarator &D, ExprTy *BitfieldWidth, 3528 tok::ObjCKeywordKind Visibility) { 3529 3530 IdentifierInfo *II = D.getIdentifier(); 3531 Expr *BitWidth = (Expr*)BitfieldWidth; 3532 SourceLocation Loc = DeclStart; 3533 if (II) Loc = D.getIdentifierLoc(); 3534 3535 // FIXME: Unnamed fields can be handled in various different ways, for 3536 // example, unnamed unions inject all members into the struct namespace! 3537 3538 QualType T = GetTypeForDeclarator(D, S); 3539 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3540 bool InvalidDecl = false; 3541 3542 if (BitWidth) { 3543 // 6.7.2.1p3, 6.7.2.1p4 3544 if (VerifyBitField(Loc, II, T, BitWidth)) { 3545 InvalidDecl = true; 3546 DeleteExpr(BitWidth); 3547 BitWidth = 0; 3548 } 3549 } else { 3550 // Not a bitfield. 3551 3552 // validate II. 3553 3554 } 3555 3556 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3557 // than a variably modified type. 3558 if (T->isVariablyModifiedType()) { 3559 Diag(Loc, diag::err_typecheck_ivar_variable_size); 3560 InvalidDecl = true; 3561 } 3562 3563 // Get the visibility (access control) for this ivar. 3564 ObjCIvarDecl::AccessControl ac = 3565 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 3566 : ObjCIvarDecl::None; 3567 3568 // Construct the decl. 3569 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, CurContext, Loc, II, T,ac, 3570 (Expr *)BitfieldWidth); 3571 3572 if (II) { 3573 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3574 if (PrevDecl && isDeclInScope(PrevDecl, CurContext, S) 3575 && !isa<TagDecl>(PrevDecl)) { 3576 Diag(Loc, diag::err_duplicate_member) << II; 3577 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3578 NewID->setInvalidDecl(); 3579 } 3580 } 3581 3582 // Process attributes attached to the ivar. 3583 ProcessDeclAttributes(NewID, D); 3584 3585 if (D.getInvalidType() || InvalidDecl) 3586 NewID->setInvalidDecl(); 3587 3588 if (II) { 3589 // FIXME: When interfaces are DeclContexts, we'll need to add 3590 // these to the interface. 3591 S->AddDecl(NewID); 3592 IdResolver.AddDecl(NewID); 3593 } 3594 3595 return NewID; 3596} 3597 3598void Sema::ActOnFields(Scope* S, 3599 SourceLocation RecLoc, DeclTy *RecDecl, 3600 DeclTy **Fields, unsigned NumFields, 3601 SourceLocation LBrac, SourceLocation RBrac, 3602 AttributeList *Attr) { 3603 Decl *EnclosingDecl = static_cast<Decl*>(RecDecl); 3604 assert(EnclosingDecl && "missing record or interface decl"); 3605 3606 // If the decl this is being inserted into is invalid, then it may be a 3607 // redeclaration or some other bogus case. Don't try to add fields to it. 3608 if (EnclosingDecl->isInvalidDecl()) { 3609 // FIXME: Deallocate fields? 3610 return; 3611 } 3612 3613 3614 // Verify that all the fields are okay. 3615 unsigned NumNamedMembers = 0; 3616 llvm::SmallVector<FieldDecl*, 32> RecFields; 3617 3618 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 3619 for (unsigned i = 0; i != NumFields; ++i) { 3620 FieldDecl *FD = cast_or_null<FieldDecl>(static_cast<Decl*>(Fields[i])); 3621 assert(FD && "missing field decl"); 3622 3623 // Get the type for the field. 3624 Type *FDTy = FD->getType().getTypePtr(); 3625 3626 if (!FD->isAnonymousStructOrUnion()) { 3627 // Remember all fields written by the user. 3628 RecFields.push_back(FD); 3629 } 3630 3631 // If the field is already invalid for some reason, don't emit more 3632 // diagnostics about it. 3633 if (FD->isInvalidDecl()) 3634 continue; 3635 3636 // C99 6.7.2.1p2 - A field may not be a function type. 3637 if (FDTy->isFunctionType()) { 3638 Diag(FD->getLocation(), diag::err_field_declared_as_function) 3639 << FD->getDeclName(); 3640 FD->setInvalidDecl(); 3641 EnclosingDecl->setInvalidDecl(); 3642 continue; 3643 } 3644 // C99 6.7.2.1p2 - A field may not be an incomplete type except... 3645 if (FDTy->isIncompleteType()) { 3646 if (!Record) { // Incomplete ivar type is always an error. 3647 RequireCompleteType(FD->getLocation(), FD->getType(), 3648 diag::err_field_incomplete); 3649 FD->setInvalidDecl(); 3650 EnclosingDecl->setInvalidDecl(); 3651 continue; 3652 } 3653 if (i != NumFields-1 || // ... that the last member ... 3654 !Record->isStruct() || // ... of a structure ... 3655 !FDTy->isArrayType()) { //... may have incomplete array type. 3656 RequireCompleteType(FD->getLocation(), FD->getType(), 3657 diag::err_field_incomplete); 3658 FD->setInvalidDecl(); 3659 EnclosingDecl->setInvalidDecl(); 3660 continue; 3661 } 3662 if (NumNamedMembers < 1) { //... must have more than named member ... 3663 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 3664 << FD->getDeclName(); 3665 FD->setInvalidDecl(); 3666 EnclosingDecl->setInvalidDecl(); 3667 continue; 3668 } 3669 // Okay, we have a legal flexible array member at the end of the struct. 3670 if (Record) 3671 Record->setHasFlexibleArrayMember(true); 3672 } 3673 /// C99 6.7.2.1p2 - a struct ending in a flexible array member cannot be the 3674 /// field of another structure or the element of an array. 3675 if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 3676 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 3677 // If this is a member of a union, then entire union becomes "flexible". 3678 if (Record && Record->isUnion()) { 3679 Record->setHasFlexibleArrayMember(true); 3680 } else { 3681 // If this is a struct/class and this is not the last element, reject 3682 // it. Note that GCC supports variable sized arrays in the middle of 3683 // structures. 3684 if (i != NumFields-1) 3685 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 3686 << FD->getDeclName(); 3687 else { 3688 // We support flexible arrays at the end of structs in 3689 // other structs as an extension. 3690 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 3691 << FD->getDeclName(); 3692 if (Record) 3693 Record->setHasFlexibleArrayMember(true); 3694 } 3695 } 3696 } 3697 } 3698 /// A field cannot be an Objective-c object 3699 if (FDTy->isObjCInterfaceType()) { 3700 Diag(FD->getLocation(), diag::err_statically_allocated_object); 3701 FD->setInvalidDecl(); 3702 EnclosingDecl->setInvalidDecl(); 3703 continue; 3704 } 3705 // Keep track of the number of named members. 3706 if (FD->getIdentifier()) 3707 ++NumNamedMembers; 3708 } 3709 3710 // Okay, we successfully defined 'Record'. 3711 if (Record) { 3712 Record->completeDefinition(Context); 3713 } else { 3714 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 3715 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 3716 ID->setIVarList(ClsFields, RecFields.size(), Context); 3717 ID->setLocEnd(RBrac); 3718 3719 // Must enforce the rule that ivars in the base classes may not be 3720 // duplicates. 3721 if (ID->getSuperClass()) { 3722 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 3723 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 3724 ObjCIvarDecl* Ivar = (*IVI); 3725 IdentifierInfo *II = Ivar->getIdentifier(); 3726 ObjCIvarDecl* prevIvar = 3727 ID->getSuperClass()->lookupInstanceVariable(II); 3728 if (prevIvar) { 3729 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 3730 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 3731 } 3732 } 3733 } 3734 } else if (ObjCImplementationDecl *IMPDecl = 3735 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 3736 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 3737 IMPDecl->setIVarList(ClsFields, RecFields.size(), Context); 3738 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 3739 } 3740 } 3741 3742 if (Attr) 3743 ProcessDeclAttributeList(Record, Attr); 3744} 3745 3746Sema::DeclTy *Sema::ActOnEnumConstant(Scope *S, DeclTy *theEnumDecl, 3747 DeclTy *lastEnumConst, 3748 SourceLocation IdLoc, IdentifierInfo *Id, 3749 SourceLocation EqualLoc, ExprTy *val) { 3750 EnumDecl *TheEnumDecl = cast<EnumDecl>(static_cast<Decl*>(theEnumDecl)); 3751 EnumConstantDecl *LastEnumConst = 3752 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(lastEnumConst)); 3753 Expr *Val = static_cast<Expr*>(val); 3754 3755 // The scope passed in may not be a decl scope. Zip up the scope tree until 3756 // we find one that is. 3757 S = getNonFieldDeclScope(S); 3758 3759 // Verify that there isn't already something declared with this name in this 3760 // scope. 3761 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 3762 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3763 // Maybe we will complain about the shadowed template parameter. 3764 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 3765 // Just pretend that we didn't see the previous declaration. 3766 PrevDecl = 0; 3767 } 3768 3769 if (PrevDecl) { 3770 // When in C++, we may get a TagDecl with the same name; in this case the 3771 // enum constant will 'hide' the tag. 3772 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 3773 "Received TagDecl when not in C++!"); 3774 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 3775 if (isa<EnumConstantDecl>(PrevDecl)) 3776 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 3777 else 3778 Diag(IdLoc, diag::err_redefinition) << Id; 3779 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3780 if (Val) Val->Destroy(Context); 3781 return 0; 3782 } 3783 } 3784 3785 llvm::APSInt EnumVal(32); 3786 QualType EltTy; 3787 if (Val) { 3788 // Make sure to promote the operand type to int. 3789 UsualUnaryConversions(Val); 3790 3791 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 3792 SourceLocation ExpLoc; 3793 if (VerifyIntegerConstantExpression(Val, &EnumVal)) { 3794 Val->Destroy(Context); 3795 Val = 0; // Just forget about it. 3796 } else { 3797 EltTy = Val->getType(); 3798 } 3799 } 3800 3801 if (!Val) { 3802 if (LastEnumConst) { 3803 // Assign the last value + 1. 3804 EnumVal = LastEnumConst->getInitVal(); 3805 ++EnumVal; 3806 3807 // Check for overflow on increment. 3808 if (EnumVal < LastEnumConst->getInitVal()) 3809 Diag(IdLoc, diag::warn_enum_value_overflow); 3810 3811 EltTy = LastEnumConst->getType(); 3812 } else { 3813 // First value, set to zero. 3814 EltTy = Context.IntTy; 3815 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 3816 } 3817 } 3818 3819 EnumConstantDecl *New = 3820 EnumConstantDecl::Create(Context, TheEnumDecl, IdLoc, Id, EltTy, 3821 Val, EnumVal); 3822 3823 // Register this decl in the current scope stack. 3824 PushOnScopeChains(New, S); 3825 3826 return New; 3827} 3828 3829// FIXME: For consistency with ActOnFields(), we should have the parser 3830// pass in the source location for the left/right braces. 3831void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclTy *EnumDeclX, 3832 DeclTy **Elements, unsigned NumElements) { 3833 EnumDecl *Enum = cast<EnumDecl>(static_cast<Decl*>(EnumDeclX)); 3834 QualType EnumType = Context.getTypeDeclType(Enum); 3835 3836 // TODO: If the result value doesn't fit in an int, it must be a long or long 3837 // long value. ISO C does not support this, but GCC does as an extension, 3838 // emit a warning. 3839 unsigned IntWidth = Context.Target.getIntWidth(); 3840 3841 // Verify that all the values are okay, compute the size of the values, and 3842 // reverse the list. 3843 unsigned NumNegativeBits = 0; 3844 unsigned NumPositiveBits = 0; 3845 3846 // Keep track of whether all elements have type int. 3847 bool AllElementsInt = true; 3848 3849 for (unsigned i = 0; i != NumElements; ++i) { 3850 EnumConstantDecl *ECD = 3851 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3852 if (!ECD) continue; // Already issued a diagnostic. 3853 3854 // If the enum value doesn't fit in an int, emit an extension warning. 3855 const llvm::APSInt &InitVal = ECD->getInitVal(); 3856 assert(InitVal.getBitWidth() >= IntWidth && 3857 "Should have promoted value to int"); 3858 if (InitVal.getBitWidth() > IntWidth) { 3859 llvm::APSInt V(InitVal); 3860 V.trunc(IntWidth); 3861 V.extend(InitVal.getBitWidth()); 3862 if (V != InitVal) 3863 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 3864 << InitVal.toString(10); 3865 } 3866 3867 // Keep track of the size of positive and negative values. 3868 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 3869 NumPositiveBits = std::max(NumPositiveBits, 3870 (unsigned)InitVal.getActiveBits()); 3871 else 3872 NumNegativeBits = std::max(NumNegativeBits, 3873 (unsigned)InitVal.getMinSignedBits()); 3874 3875 // Keep track of whether every enum element has type int (very commmon). 3876 if (AllElementsInt) 3877 AllElementsInt = ECD->getType() == Context.IntTy; 3878 } 3879 3880 // Figure out the type that should be used for this enum. 3881 // FIXME: Support attribute(packed) on enums and -fshort-enums. 3882 QualType BestType; 3883 unsigned BestWidth; 3884 3885 if (NumNegativeBits) { 3886 // If there is a negative value, figure out the smallest integer type (of 3887 // int/long/longlong) that fits. 3888 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 3889 BestType = Context.IntTy; 3890 BestWidth = IntWidth; 3891 } else { 3892 BestWidth = Context.Target.getLongWidth(); 3893 3894 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 3895 BestType = Context.LongTy; 3896 else { 3897 BestWidth = Context.Target.getLongLongWidth(); 3898 3899 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 3900 Diag(Enum->getLocation(), diag::warn_enum_too_large); 3901 BestType = Context.LongLongTy; 3902 } 3903 } 3904 } else { 3905 // If there is no negative value, figure out which of uint, ulong, ulonglong 3906 // fits. 3907 if (NumPositiveBits <= IntWidth) { 3908 BestType = Context.UnsignedIntTy; 3909 BestWidth = IntWidth; 3910 } else if (NumPositiveBits <= 3911 (BestWidth = Context.Target.getLongWidth())) { 3912 BestType = Context.UnsignedLongTy; 3913 } else { 3914 BestWidth = Context.Target.getLongLongWidth(); 3915 assert(NumPositiveBits <= BestWidth && 3916 "How could an initializer get larger than ULL?"); 3917 BestType = Context.UnsignedLongLongTy; 3918 } 3919 } 3920 3921 // Loop over all of the enumerator constants, changing their types to match 3922 // the type of the enum if needed. 3923 for (unsigned i = 0; i != NumElements; ++i) { 3924 EnumConstantDecl *ECD = 3925 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3926 if (!ECD) continue; // Already issued a diagnostic. 3927 3928 // Standard C says the enumerators have int type, but we allow, as an 3929 // extension, the enumerators to be larger than int size. If each 3930 // enumerator value fits in an int, type it as an int, otherwise type it the 3931 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 3932 // that X has type 'int', not 'unsigned'. 3933 if (ECD->getType() == Context.IntTy) { 3934 // Make sure the init value is signed. 3935 llvm::APSInt IV = ECD->getInitVal(); 3936 IV.setIsSigned(true); 3937 ECD->setInitVal(IV); 3938 3939 if (getLangOptions().CPlusPlus) 3940 // C++ [dcl.enum]p4: Following the closing brace of an 3941 // enum-specifier, each enumerator has the type of its 3942 // enumeration. 3943 ECD->setType(EnumType); 3944 continue; // Already int type. 3945 } 3946 3947 // Determine whether the value fits into an int. 3948 llvm::APSInt InitVal = ECD->getInitVal(); 3949 bool FitsInInt; 3950 if (InitVal.isUnsigned() || !InitVal.isNegative()) 3951 FitsInInt = InitVal.getActiveBits() < IntWidth; 3952 else 3953 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 3954 3955 // If it fits into an integer type, force it. Otherwise force it to match 3956 // the enum decl type. 3957 QualType NewTy; 3958 unsigned NewWidth; 3959 bool NewSign; 3960 if (FitsInInt) { 3961 NewTy = Context.IntTy; 3962 NewWidth = IntWidth; 3963 NewSign = true; 3964 } else if (ECD->getType() == BestType) { 3965 // Already the right type! 3966 if (getLangOptions().CPlusPlus) 3967 // C++ [dcl.enum]p4: Following the closing brace of an 3968 // enum-specifier, each enumerator has the type of its 3969 // enumeration. 3970 ECD->setType(EnumType); 3971 continue; 3972 } else { 3973 NewTy = BestType; 3974 NewWidth = BestWidth; 3975 NewSign = BestType->isSignedIntegerType(); 3976 } 3977 3978 // Adjust the APSInt value. 3979 InitVal.extOrTrunc(NewWidth); 3980 InitVal.setIsSigned(NewSign); 3981 ECD->setInitVal(InitVal); 3982 3983 // Adjust the Expr initializer and type. 3984 if (ECD->getInitExpr()) 3985 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), 3986 /*isLvalue=*/false)); 3987 if (getLangOptions().CPlusPlus) 3988 // C++ [dcl.enum]p4: Following the closing brace of an 3989 // enum-specifier, each enumerator has the type of its 3990 // enumeration. 3991 ECD->setType(EnumType); 3992 else 3993 ECD->setType(NewTy); 3994 } 3995 3996 Enum->completeDefinition(Context, BestType); 3997} 3998 3999Sema::DeclTy *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 4000 ExprArg expr) { 4001 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr.release()); 4002 4003 return FileScopeAsmDecl::Create(Context, CurContext, Loc, AsmString); 4004} 4005 4006