SemaDecl.cpp revision 11578179e813f5db02e04c626b99fa64b8d4da7e
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 // C++ [temp.res]p3: 56 // A qualified-id that refers to a type and in which the 57 // nested-name-specifier depends on a template-parameter (14.6.2) 58 // shall be prefixed by the keyword typename to indicate that the 59 // qualified-id denotes a type, forming an 60 // elaborated-type-specifier (7.1.5.3). 61 // 62 // We therefore do not perform any name lookup up SS is a dependent 63 // scope name. FIXME: we will need to perform a special kind of 64 // lookup if the scope specifier names a member of the current 65 // instantiation. 66 if (SS && isDependentScopeSpecifier(*SS)) 67 return 0; 68 69 NamedDecl *IIDecl = 0; 70 LookupResult Result = LookupParsedName(S, SS, &II, LookupOrdinaryName, 71 false, false); 72 switch (Result.getKind()) { 73 case LookupResult::NotFound: 74 case LookupResult::FoundOverloaded: 75 return 0; 76 77 case LookupResult::AmbiguousBaseSubobjectTypes: 78 case LookupResult::AmbiguousBaseSubobjects: 79 case LookupResult::AmbiguousReference: 80 DiagnoseAmbiguousLookup(Result, DeclarationName(&II), NameLoc); 81 return 0; 82 83 case LookupResult::Found: 84 IIDecl = Result.getAsDecl(); 85 break; 86 } 87 88 if (IIDecl) { 89 QualType T; 90 91 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 92 // Check whether we can use this type 93 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 94 95 T = Context.getTypeDeclType(TD); 96 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 97 // Check whether we can use this interface. 98 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 99 100 T = Context.getObjCInterfaceType(IDecl); 101 } else 102 return 0; 103 104 if (SS) 105 T = getQualifiedNameType(*SS, T); 106 107 return T.getAsOpaquePtr(); 108 } 109 110 return 0; 111} 112 113DeclContext *Sema::getContainingDC(DeclContext *DC) { 114 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) { 115 // A C++ out-of-line method will return to the file declaration context. 116 if (MD->isOutOfLineDefinition()) 117 return MD->getLexicalDeclContext(); 118 119 // A C++ inline method is parsed *after* the topmost class it was declared 120 // in is fully parsed (it's "complete"). 121 // The parsing of a C++ inline method happens at the declaration context of 122 // the topmost (non-nested) class it is lexically declared in. 123 assert(isa<CXXRecordDecl>(MD->getParent()) && "C++ method not in Record."); 124 DC = MD->getParent(); 125 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 126 DC = RD; 127 128 // Return the declaration context of the topmost class the inline method is 129 // declared in. 130 return DC; 131 } 132 133 if (isa<ObjCMethodDecl>(DC)) 134 return Context.getTranslationUnitDecl(); 135 136 return DC->getLexicalParent(); 137} 138 139void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 140 assert(getContainingDC(DC) == CurContext && 141 "The next DeclContext should be lexically contained in the current one."); 142 CurContext = DC; 143 S->setEntity(DC); 144} 145 146void Sema::PopDeclContext() { 147 assert(CurContext && "DeclContext imbalance!"); 148 149 CurContext = getContainingDC(CurContext); 150} 151 152/// \brief Determine whether we allow overloading of the function 153/// PrevDecl with another declaration. 154/// 155/// This routine determines whether overloading is possible, not 156/// whether some new function is actually an overload. It will return 157/// true in C++ (where we can always provide overloads) or, as an 158/// extension, in C when the previous function is already an 159/// overloaded function declaration or has the "overloadable" 160/// attribute. 161static bool AllowOverloadingOfFunction(Decl *PrevDecl, ASTContext &Context) { 162 if (Context.getLangOptions().CPlusPlus) 163 return true; 164 165 if (isa<OverloadedFunctionDecl>(PrevDecl)) 166 return true; 167 168 return PrevDecl->getAttr<OverloadableAttr>() != 0; 169} 170 171/// Add this decl to the scope shadowed decl chains. 172void Sema::PushOnScopeChains(NamedDecl *D, Scope *S) { 173 // Move up the scope chain until we find the nearest enclosing 174 // non-transparent context. The declaration will be introduced into this 175 // scope. 176 while (S->getEntity() && 177 ((DeclContext *)S->getEntity())->isTransparentContext()) 178 S = S->getParent(); 179 180 S->AddDecl(D); 181 182 // Add scoped declarations into their context, so that they can be 183 // found later. Declarations without a context won't be inserted 184 // into any context. 185 CurContext->addDecl(D); 186 187 // C++ [basic.scope]p4: 188 // -- exactly one declaration shall declare a class name or 189 // enumeration name that is not a typedef name and the other 190 // declarations shall all refer to the same object or 191 // enumerator, or all refer to functions and function templates; 192 // in this case the class name or enumeration name is hidden. 193 if (TagDecl *TD = dyn_cast<TagDecl>(D)) { 194 // We are pushing the name of a tag (enum or class). 195 if (CurContext->getLookupContext() 196 == TD->getDeclContext()->getLookupContext()) { 197 // We're pushing the tag into the current context, which might 198 // require some reshuffling in the identifier resolver. 199 IdentifierResolver::iterator 200 I = IdResolver.begin(TD->getDeclName()), 201 IEnd = IdResolver.end(); 202 if (I != IEnd && isDeclInScope(*I, CurContext, S)) { 203 NamedDecl *PrevDecl = *I; 204 for (; I != IEnd && isDeclInScope(*I, CurContext, S); 205 PrevDecl = *I, ++I) { 206 if (TD->declarationReplaces(*I)) { 207 // This is a redeclaration. Remove it from the chain and 208 // break out, so that we'll add in the shadowed 209 // declaration. 210 S->RemoveDecl(*I); 211 if (PrevDecl == *I) { 212 IdResolver.RemoveDecl(*I); 213 IdResolver.AddDecl(TD); 214 return; 215 } else { 216 IdResolver.RemoveDecl(*I); 217 break; 218 } 219 } 220 } 221 222 // There is already a declaration with the same name in the same 223 // scope, which is not a tag declaration. It must be found 224 // before we find the new declaration, so insert the new 225 // declaration at the end of the chain. 226 IdResolver.AddShadowedDecl(TD, PrevDecl); 227 228 return; 229 } 230 } 231 } else if (isa<FunctionDecl>(D) && 232 AllowOverloadingOfFunction(D, Context)) { 233 // We are pushing the name of a function, which might be an 234 // overloaded name. 235 FunctionDecl *FD = cast<FunctionDecl>(D); 236 IdentifierResolver::iterator Redecl 237 = std::find_if(IdResolver.begin(FD->getDeclName()), 238 IdResolver.end(), 239 std::bind1st(std::mem_fun(&NamedDecl::declarationReplaces), 240 FD)); 241 if (Redecl != IdResolver.end() && S->isDeclScope(*Redecl)) { 242 // There is already a declaration of a function on our 243 // IdResolver chain. Replace it with this declaration. 244 S->RemoveDecl(*Redecl); 245 IdResolver.RemoveDecl(*Redecl); 246 } 247 } 248 249 IdResolver.AddDecl(D); 250} 251 252void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 253 if (S->decl_empty()) return; 254 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 255 "Scope shouldn't contain decls!"); 256 257 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 258 I != E; ++I) { 259 Decl *TmpD = static_cast<Decl*>(*I); 260 assert(TmpD && "This decl didn't get pushed??"); 261 262 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 263 NamedDecl *D = cast<NamedDecl>(TmpD); 264 265 if (!D->getDeclName()) continue; 266 267 // Remove this name from our lexical scope. 268 IdResolver.RemoveDecl(D); 269 } 270} 271 272/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 273/// return 0 if one not found. 274ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 275 // The third "scope" argument is 0 since we aren't enabling lazy built-in 276 // creation from this context. 277 NamedDecl *IDecl = LookupName(TUScope, Id, LookupOrdinaryName); 278 279 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 280} 281 282/// getNonFieldDeclScope - Retrieves the innermost scope, starting 283/// from S, where a non-field would be declared. This routine copes 284/// with the difference between C and C++ scoping rules in structs and 285/// unions. For example, the following code is well-formed in C but 286/// ill-formed in C++: 287/// @code 288/// struct S6 { 289/// enum { BAR } e; 290/// }; 291/// 292/// void test_S6() { 293/// struct S6 a; 294/// a.e = BAR; 295/// } 296/// @endcode 297/// For the declaration of BAR, this routine will return a different 298/// scope. The scope S will be the scope of the unnamed enumeration 299/// within S6. In C++, this routine will return the scope associated 300/// with S6, because the enumeration's scope is a transparent 301/// context but structures can contain non-field names. In C, this 302/// routine will return the translation unit scope, since the 303/// enumeration's scope is a transparent context and structures cannot 304/// contain non-field names. 305Scope *Sema::getNonFieldDeclScope(Scope *S) { 306 while (((S->getFlags() & Scope::DeclScope) == 0) || 307 (S->getEntity() && 308 ((DeclContext *)S->getEntity())->isTransparentContext()) || 309 (S->isClassScope() && !getLangOptions().CPlusPlus)) 310 S = S->getParent(); 311 return S; 312} 313 314void Sema::InitBuiltinVaListType() { 315 if (!Context.getBuiltinVaListType().isNull()) 316 return; 317 318 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 319 NamedDecl *VaDecl = LookupName(TUScope, VaIdent, LookupOrdinaryName); 320 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 321 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 322} 323 324/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 325/// file scope. lazily create a decl for it. ForRedeclaration is true 326/// if we're creating this built-in in anticipation of redeclaring the 327/// built-in. 328NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 329 Scope *S, bool ForRedeclaration, 330 SourceLocation Loc) { 331 Builtin::ID BID = (Builtin::ID)bid; 332 333 if (Context.BuiltinInfo.hasVAListUse(BID)) 334 InitBuiltinVaListType(); 335 336 Builtin::Context::GetBuiltinTypeError Error; 337 QualType R = Context.BuiltinInfo.GetBuiltinType(BID, Context, Error); 338 switch (Error) { 339 case Builtin::Context::GE_None: 340 // Okay 341 break; 342 343 case Builtin::Context::GE_Missing_FILE: 344 if (ForRedeclaration) 345 Diag(Loc, diag::err_implicit_decl_requires_stdio) 346 << Context.BuiltinInfo.GetName(BID); 347 return 0; 348 } 349 350 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 351 Diag(Loc, diag::ext_implicit_lib_function_decl) 352 << Context.BuiltinInfo.GetName(BID) 353 << R; 354 if (Context.BuiltinInfo.getHeaderName(BID) && 355 Diags.getDiagnosticMapping(diag::ext_implicit_lib_function_decl) 356 != diag::MAP_IGNORE) 357 Diag(Loc, diag::note_please_include_header) 358 << Context.BuiltinInfo.getHeaderName(BID) 359 << Context.BuiltinInfo.GetName(BID); 360 } 361 362 FunctionDecl *New = FunctionDecl::Create(Context, 363 Context.getTranslationUnitDecl(), 364 Loc, II, R, 365 FunctionDecl::Extern, false, 366 /*hasPrototype=*/true); 367 New->setImplicit(); 368 369 // Create Decl objects for each parameter, adding them to the 370 // FunctionDecl. 371 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 372 llvm::SmallVector<ParmVarDecl*, 16> Params; 373 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 374 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 375 FT->getArgType(i), VarDecl::None, 0)); 376 New->setParams(Context, &Params[0], Params.size()); 377 } 378 379 AddKnownFunctionAttributes(New); 380 381 // TUScope is the translation-unit scope to insert this function into. 382 // FIXME: This is hideous. We need to teach PushOnScopeChains to 383 // relate Scopes to DeclContexts, and probably eliminate CurContext 384 // entirely, but we're not there yet. 385 DeclContext *SavedContext = CurContext; 386 CurContext = Context.getTranslationUnitDecl(); 387 PushOnScopeChains(New, TUScope); 388 CurContext = SavedContext; 389 return New; 390} 391 392/// GetStdNamespace - This method gets the C++ "std" namespace. This is where 393/// everything from the standard library is defined. 394NamespaceDecl *Sema::GetStdNamespace() { 395 if (!StdNamespace) { 396 IdentifierInfo *StdIdent = &PP.getIdentifierTable().get("std"); 397 DeclContext *Global = Context.getTranslationUnitDecl(); 398 Decl *Std = LookupQualifiedName(Global, StdIdent, LookupNamespaceName); 399 StdNamespace = dyn_cast_or_null<NamespaceDecl>(Std); 400 } 401 return StdNamespace; 402} 403 404/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 405/// same name and scope as a previous declaration 'Old'. Figure out 406/// how to resolve this situation, merging decls or emitting 407/// diagnostics as appropriate. Returns true if there was an error, 408/// false otherwise. 409/// 410bool Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 411 bool objc_types = false; 412 // Allow multiple definitions for ObjC built-in typedefs. 413 // FIXME: Verify the underlying types are equivalent! 414 if (getLangOptions().ObjC1) { 415 const IdentifierInfo *TypeID = New->getIdentifier(); 416 switch (TypeID->getLength()) { 417 default: break; 418 case 2: 419 if (!TypeID->isStr("id")) 420 break; 421 Context.setObjCIdType(New); 422 objc_types = true; 423 break; 424 case 5: 425 if (!TypeID->isStr("Class")) 426 break; 427 Context.setObjCClassType(New); 428 objc_types = true; 429 return false; 430 case 3: 431 if (!TypeID->isStr("SEL")) 432 break; 433 Context.setObjCSelType(New); 434 objc_types = true; 435 return false; 436 case 8: 437 if (!TypeID->isStr("Protocol")) 438 break; 439 Context.setObjCProtoType(New->getUnderlyingType()); 440 objc_types = true; 441 return false; 442 } 443 // Fall through - the typedef name was not a builtin type. 444 } 445 // Verify the old decl was also a type. 446 TypeDecl *Old = dyn_cast<TypeDecl>(OldD); 447 if (!Old) { 448 Diag(New->getLocation(), diag::err_redefinition_different_kind) 449 << New->getDeclName(); 450 if (!objc_types) 451 Diag(OldD->getLocation(), diag::note_previous_definition); 452 return true; 453 } 454 455 // Determine the "old" type we'll use for checking and diagnostics. 456 QualType OldType; 457 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 458 OldType = OldTypedef->getUnderlyingType(); 459 else 460 OldType = Context.getTypeDeclType(Old); 461 462 // If the typedef types are not identical, reject them in all languages and 463 // with any extensions enabled. 464 465 if (OldType != New->getUnderlyingType() && 466 Context.getCanonicalType(OldType) != 467 Context.getCanonicalType(New->getUnderlyingType())) { 468 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 469 << New->getUnderlyingType() << OldType; 470 if (!objc_types) 471 Diag(Old->getLocation(), diag::note_previous_definition); 472 return true; 473 } 474 if (objc_types) return false; 475 if (getLangOptions().Microsoft) return false; 476 477 // C++ [dcl.typedef]p2: 478 // In a given non-class scope, a typedef specifier can be used to 479 // redefine the name of any type declared in that scope to refer 480 // to the type to which it already refers. 481 if (getLangOptions().CPlusPlus && !isa<CXXRecordDecl>(CurContext)) 482 return false; 483 484 // In C, redeclaration of a type is a constraint violation (6.7.2.3p1). 485 // Apparently GCC, Intel, and Sun all silently ignore the redeclaration if 486 // *either* declaration is in a system header. The code below implements 487 // this adhoc compatibility rule. FIXME: The following code will not 488 // work properly when compiling ".i" files (containing preprocessed output). 489 if (PP.getDiagnostics().getSuppressSystemWarnings()) { 490 SourceManager &SrcMgr = Context.getSourceManager(); 491 if (SrcMgr.isInSystemHeader(Old->getLocation())) 492 return false; 493 if (SrcMgr.isInSystemHeader(New->getLocation())) 494 return false; 495 } 496 497 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 498 Diag(Old->getLocation(), diag::note_previous_definition); 499 return true; 500} 501 502/// DeclhasAttr - returns true if decl Declaration already has the target 503/// attribute. 504static bool DeclHasAttr(const Decl *decl, const Attr *target) { 505 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 506 if (attr->getKind() == target->getKind()) 507 return true; 508 509 return false; 510} 511 512/// MergeAttributes - append attributes from the Old decl to the New one. 513static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 514 Attr *attr = const_cast<Attr*>(Old->getAttrs()); 515 516 while (attr) { 517 Attr *tmp = attr; 518 attr = attr->getNext(); 519 520 if (!DeclHasAttr(New, tmp) && tmp->isMerged()) { 521 tmp->setInherited(true); 522 New->addAttr(tmp); 523 } else { 524 tmp->setNext(0); 525 tmp->Destroy(C); 526 } 527 } 528 529 Old->invalidateAttrs(); 530} 531 532/// Used in MergeFunctionDecl to keep track of function parameters in 533/// C. 534struct GNUCompatibleParamWarning { 535 ParmVarDecl *OldParm; 536 ParmVarDecl *NewParm; 537 QualType PromotedType; 538}; 539 540/// MergeFunctionDecl - We just parsed a function 'New' from 541/// declarator D which has the same name and scope as a previous 542/// declaration 'Old'. Figure out how to resolve this situation, 543/// merging decls or emitting diagnostics as appropriate. 544/// 545/// In C++, New and Old must be declarations that are not 546/// overloaded. Use IsOverload to determine whether New and Old are 547/// overloaded, and to select the Old declaration that New should be 548/// merged with. 549/// 550/// Returns true if there was an error, false otherwise. 551bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 552 assert(!isa<OverloadedFunctionDecl>(OldD) && 553 "Cannot merge with an overloaded function declaration"); 554 555 // Verify the old decl was also a function. 556 FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); 557 if (!Old) { 558 Diag(New->getLocation(), diag::err_redefinition_different_kind) 559 << New->getDeclName(); 560 Diag(OldD->getLocation(), diag::note_previous_definition); 561 return true; 562 } 563 564 // Determine whether the previous declaration was a definition, 565 // implicit declaration, or a declaration. 566 diag::kind PrevDiag; 567 if (Old->isThisDeclarationADefinition()) 568 PrevDiag = diag::note_previous_definition; 569 else if (Old->isImplicit()) 570 PrevDiag = diag::note_previous_implicit_declaration; 571 else 572 PrevDiag = diag::note_previous_declaration; 573 574 QualType OldQType = Context.getCanonicalType(Old->getType()); 575 QualType NewQType = Context.getCanonicalType(New->getType()); 576 577 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 578 New->getStorageClass() == FunctionDecl::Static && 579 Old->getStorageClass() != FunctionDecl::Static) { 580 Diag(New->getLocation(), diag::err_static_non_static) 581 << New; 582 Diag(Old->getLocation(), PrevDiag); 583 return true; 584 } 585 586 if (getLangOptions().CPlusPlus) { 587 // (C++98 13.1p2): 588 // Certain function declarations cannot be overloaded: 589 // -- Function declarations that differ only in the return type 590 // cannot be overloaded. 591 QualType OldReturnType 592 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 593 QualType NewReturnType 594 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 595 if (OldReturnType != NewReturnType) { 596 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 597 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 598 return true; 599 } 600 601 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 602 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 603 if (OldMethod && NewMethod && 604 OldMethod->getLexicalDeclContext() == 605 NewMethod->getLexicalDeclContext()) { 606 // -- Member function declarations with the same name and the 607 // same parameter types cannot be overloaded if any of them 608 // is a static member function declaration. 609 if (OldMethod->isStatic() || NewMethod->isStatic()) { 610 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 611 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 612 return true; 613 } 614 615 // C++ [class.mem]p1: 616 // [...] A member shall not be declared twice in the 617 // member-specification, except that a nested class or member 618 // class template can be declared and then later defined. 619 unsigned NewDiag; 620 if (isa<CXXConstructorDecl>(OldMethod)) 621 NewDiag = diag::err_constructor_redeclared; 622 else if (isa<CXXDestructorDecl>(NewMethod)) 623 NewDiag = diag::err_destructor_redeclared; 624 else if (isa<CXXConversionDecl>(NewMethod)) 625 NewDiag = diag::err_conv_function_redeclared; 626 else 627 NewDiag = diag::err_member_redeclared; 628 629 Diag(New->getLocation(), NewDiag); 630 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 631 } 632 633 // (C++98 8.3.5p3): 634 // All declarations for a function shall agree exactly in both the 635 // return type and the parameter-type-list. 636 if (OldQType == NewQType) 637 return MergeCompatibleFunctionDecls(New, Old); 638 639 // Fall through for conflicting redeclarations and redefinitions. 640 } 641 642 // C: Function types need to be compatible, not identical. This handles 643 // duplicate function decls like "void f(int); void f(enum X);" properly. 644 if (!getLangOptions().CPlusPlus && 645 Context.typesAreCompatible(OldQType, NewQType)) { 646 const FunctionType *OldFuncType = OldQType->getAsFunctionType(); 647 const FunctionType *NewFuncType = NewQType->getAsFunctionType(); 648 const FunctionProtoType *OldProto = 0; 649 if (isa<FunctionNoProtoType>(NewFuncType) && 650 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 651 // The old declaration provided a function prototype, but the 652 // new declaration does not. Merge in the prototype. 653 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 654 OldProto->arg_type_end()); 655 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 656 &ParamTypes[0], ParamTypes.size(), 657 OldProto->isVariadic(), 658 OldProto->getTypeQuals()); 659 New->setType(NewQType); 660 New->setInheritedPrototype(); 661 662 // Synthesize a parameter for each argument type. 663 llvm::SmallVector<ParmVarDecl*, 16> Params; 664 for (FunctionProtoType::arg_type_iterator 665 ParamType = OldProto->arg_type_begin(), 666 ParamEnd = OldProto->arg_type_end(); 667 ParamType != ParamEnd; ++ParamType) { 668 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 669 SourceLocation(), 0, 670 *ParamType, VarDecl::None, 671 0); 672 Param->setImplicit(); 673 Params.push_back(Param); 674 } 675 676 New->setParams(Context, &Params[0], Params.size()); 677 } 678 679 return MergeCompatibleFunctionDecls(New, Old); 680 } 681 682 // GNU C permits a K&R definition to follow a prototype declaration 683 // if the declared types of the parameters in the K&R definition 684 // match the types in the prototype declaration, even when the 685 // promoted types of the parameters from the K&R definition differ 686 // from the types in the prototype. GCC then keeps the types from 687 // the prototype. 688 if (!getLangOptions().CPlusPlus && 689 !getLangOptions().NoExtensions && 690 Old->hasPrototype() && !New->hasPrototype() && 691 New->getType()->getAsFunctionProtoType() && 692 Old->getNumParams() == New->getNumParams()) { 693 llvm::SmallVector<QualType, 16> ArgTypes; 694 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 695 const FunctionProtoType *OldProto 696 = Old->getType()->getAsFunctionProtoType(); 697 const FunctionProtoType *NewProto 698 = New->getType()->getAsFunctionProtoType(); 699 700 // Determine whether this is the GNU C extension. 701 bool GNUCompatible = 702 Context.typesAreCompatible(OldProto->getResultType(), 703 NewProto->getResultType()) && 704 (OldProto->isVariadic() == NewProto->isVariadic()); 705 for (unsigned Idx = 0, End = Old->getNumParams(); 706 GNUCompatible && Idx != End; ++Idx) { 707 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 708 ParmVarDecl *NewParm = New->getParamDecl(Idx); 709 if (Context.typesAreCompatible(OldParm->getType(), 710 NewProto->getArgType(Idx))) { 711 ArgTypes.push_back(NewParm->getType()); 712 } else if (Context.typesAreCompatible(OldParm->getType(), 713 NewParm->getType())) { 714 GNUCompatibleParamWarning Warn 715 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 716 Warnings.push_back(Warn); 717 ArgTypes.push_back(NewParm->getType()); 718 } else 719 GNUCompatible = false; 720 } 721 722 if (GNUCompatible) { 723 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 724 Diag(Warnings[Warn].NewParm->getLocation(), 725 diag::ext_param_promoted_not_compatible_with_prototype) 726 << Warnings[Warn].PromotedType 727 << Warnings[Warn].OldParm->getType(); 728 Diag(Warnings[Warn].OldParm->getLocation(), 729 diag::note_previous_declaration); 730 } 731 732 New->setType(Context.getFunctionType(NewProto->getResultType(), 733 &ArgTypes[0], ArgTypes.size(), 734 NewProto->isVariadic(), 735 NewProto->getTypeQuals())); 736 return MergeCompatibleFunctionDecls(New, Old); 737 } 738 739 // Fall through to diagnose conflicting types. 740 } 741 742 // A function that has already been declared has been redeclared or defined 743 // with a different type- show appropriate diagnostic 744 if (unsigned BuiltinID = Old->getBuiltinID(Context)) { 745 // The user has declared a builtin function with an incompatible 746 // signature. 747 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 748 // The function the user is redeclaring is a library-defined 749 // function like 'malloc' or 'printf'. Warn about the 750 // redeclaration, then ignore it. 751 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 752 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 753 << Old << Old->getType(); 754 return true; 755 } 756 757 PrevDiag = diag::note_previous_builtin_declaration; 758 } 759 760 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 761 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 762 return true; 763} 764 765/// \brief Completes the merge of two function declarations that are 766/// known to be compatible. 767/// 768/// This routine handles the merging of attributes and other 769/// properties of function declarations form the old declaration to 770/// the new declaration, once we know that New is in fact a 771/// redeclaration of Old. 772/// 773/// \returns false 774bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 775 // Merge the attributes 776 MergeAttributes(New, Old, Context); 777 778 // Merge the storage class. 779 New->setStorageClass(Old->getStorageClass()); 780 781 // FIXME: need to implement inline semantics 782 783 // Merge "pure" flag. 784 if (Old->isPure()) 785 New->setPure(); 786 787 // Merge the "deleted" flag. 788 if (Old->isDeleted()) 789 New->setDeleted(); 790 791 if (getLangOptions().CPlusPlus) 792 return MergeCXXFunctionDecl(New, Old); 793 794 return false; 795} 796 797/// MergeVarDecl - We just parsed a variable 'New' which has the same name 798/// and scope as a previous declaration 'Old'. Figure out how to resolve this 799/// situation, merging decls or emitting diagnostics as appropriate. 800/// 801/// Tentative definition rules (C99 6.9.2p2) are checked by 802/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 803/// definitions here, since the initializer hasn't been attached. 804/// 805bool Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 806 // Verify the old decl was also a variable. 807 VarDecl *Old = dyn_cast<VarDecl>(OldD); 808 if (!Old) { 809 Diag(New->getLocation(), diag::err_redefinition_different_kind) 810 << New->getDeclName(); 811 Diag(OldD->getLocation(), diag::note_previous_definition); 812 return true; 813 } 814 815 MergeAttributes(New, Old, Context); 816 817 // Merge the types 818 QualType MergedT = Context.mergeTypes(New->getType(), Old->getType()); 819 if (MergedT.isNull()) { 820 Diag(New->getLocation(), diag::err_redefinition_different_type) 821 << New->getDeclName(); 822 Diag(Old->getLocation(), diag::note_previous_definition); 823 return true; 824 } 825 New->setType(MergedT); 826 827 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 828 if (New->getStorageClass() == VarDecl::Static && 829 (Old->getStorageClass() == VarDecl::None || 830 Old->getStorageClass() == VarDecl::Extern)) { 831 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 832 Diag(Old->getLocation(), diag::note_previous_definition); 833 return true; 834 } 835 // C99 6.2.2p4: 836 // For an identifier declared with the storage-class specifier 837 // extern in a scope in which a prior declaration of that 838 // identifier is visible,23) if the prior declaration specifies 839 // internal or external linkage, the linkage of the identifier at 840 // the later declaration is the same as the linkage specified at 841 // the prior declaration. If no prior declaration is visible, or 842 // if the prior declaration specifies no linkage, then the 843 // identifier has external linkage. 844 if (New->hasExternalStorage() && Old->hasLinkage()) 845 /* Okay */; 846 else if (New->getStorageClass() != VarDecl::Static && 847 Old->getStorageClass() == VarDecl::Static) { 848 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 849 Diag(Old->getLocation(), diag::note_previous_definition); 850 return true; 851 } 852 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 853 if (New->getStorageClass() != VarDecl::Extern && !New->isFileVarDecl() && 854 // Don't complain about out-of-line definitions of static members. 855 !(Old->getLexicalDeclContext()->isRecord() && 856 !New->getLexicalDeclContext()->isRecord())) { 857 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 858 Diag(Old->getLocation(), diag::note_previous_definition); 859 return true; 860 } 861 862 // Keep a chain of previous declarations. 863 New->setPreviousDeclaration(Old); 864 865 return false; 866} 867 868/// CheckParmsForFunctionDef - Check that the parameters of the given 869/// function are appropriate for the definition of a function. This 870/// takes care of any checks that cannot be performed on the 871/// declaration itself, e.g., that the types of each of the function 872/// parameters are complete. 873bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 874 bool HasInvalidParm = false; 875 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 876 ParmVarDecl *Param = FD->getParamDecl(p); 877 878 // C99 6.7.5.3p4: the parameters in a parameter type list in a 879 // function declarator that is part of a function definition of 880 // that function shall not have incomplete type. 881 if (!Param->isInvalidDecl() && 882 RequireCompleteType(Param->getLocation(), Param->getType(), 883 diag::err_typecheck_decl_incomplete_type)) { 884 Param->setInvalidDecl(); 885 HasInvalidParm = true; 886 } 887 888 // C99 6.9.1p5: If the declarator includes a parameter type list, the 889 // declaration of each parameter shall include an identifier. 890 if (Param->getIdentifier() == 0 && 891 !Param->isImplicit() && 892 !getLangOptions().CPlusPlus) 893 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 894 } 895 896 return HasInvalidParm; 897} 898 899/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 900/// no declarator (e.g. "struct foo;") is parsed. 901Sema::DeclTy *Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 902 TagDecl *Tag = 0; 903 if (DS.getTypeSpecType() == DeclSpec::TST_class || 904 DS.getTypeSpecType() == DeclSpec::TST_struct || 905 DS.getTypeSpecType() == DeclSpec::TST_union || 906 DS.getTypeSpecType() == DeclSpec::TST_enum) 907 Tag = dyn_cast<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 908 909 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 910 if (!Record->getDeclName() && Record->isDefinition() && 911 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 912 if (getLangOptions().CPlusPlus || 913 Record->getDeclContext()->isRecord()) 914 return BuildAnonymousStructOrUnion(S, DS, Record); 915 916 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 917 << DS.getSourceRange(); 918 } 919 920 // Microsoft allows unnamed struct/union fields. Don't complain 921 // about them. 922 // FIXME: Should we support Microsoft's extensions in this area? 923 if (Record->getDeclName() && getLangOptions().Microsoft) 924 return Tag; 925 } 926 927 if (!DS.isMissingDeclaratorOk() && 928 DS.getTypeSpecType() != DeclSpec::TST_error) { 929 // Warn about typedefs of enums without names, since this is an 930 // extension in both Microsoft an GNU. 931 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 932 Tag && isa<EnumDecl>(Tag)) { 933 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 934 << DS.getSourceRange(); 935 return Tag; 936 } 937 938 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 939 << DS.getSourceRange(); 940 return 0; 941 } 942 943 return Tag; 944} 945 946/// InjectAnonymousStructOrUnionMembers - Inject the members of the 947/// anonymous struct or union AnonRecord into the owning context Owner 948/// and scope S. This routine will be invoked just after we realize 949/// that an unnamed union or struct is actually an anonymous union or 950/// struct, e.g., 951/// 952/// @code 953/// union { 954/// int i; 955/// float f; 956/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 957/// // f into the surrounding scope.x 958/// @endcode 959/// 960/// This routine is recursive, injecting the names of nested anonymous 961/// structs/unions into the owning context and scope as well. 962bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 963 RecordDecl *AnonRecord) { 964 bool Invalid = false; 965 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 966 FEnd = AnonRecord->field_end(); 967 F != FEnd; ++F) { 968 if ((*F)->getDeclName()) { 969 NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 970 LookupOrdinaryName, true); 971 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 972 // C++ [class.union]p2: 973 // The names of the members of an anonymous union shall be 974 // distinct from the names of any other entity in the 975 // scope in which the anonymous union is declared. 976 unsigned diagKind 977 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 978 : diag::err_anonymous_struct_member_redecl; 979 Diag((*F)->getLocation(), diagKind) 980 << (*F)->getDeclName(); 981 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 982 Invalid = true; 983 } else { 984 // C++ [class.union]p2: 985 // For the purpose of name lookup, after the anonymous union 986 // definition, the members of the anonymous union are 987 // considered to have been defined in the scope in which the 988 // anonymous union is declared. 989 Owner->makeDeclVisibleInContext(*F); 990 S->AddDecl(*F); 991 IdResolver.AddDecl(*F); 992 } 993 } else if (const RecordType *InnerRecordType 994 = (*F)->getType()->getAsRecordType()) { 995 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 996 if (InnerRecord->isAnonymousStructOrUnion()) 997 Invalid = Invalid || 998 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 999 } 1000 } 1001 1002 return Invalid; 1003} 1004 1005/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1006/// anonymous structure or union. Anonymous unions are a C++ feature 1007/// (C++ [class.union]) and a GNU C extension; anonymous structures 1008/// are a GNU C and GNU C++ extension. 1009Sema::DeclTy *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1010 RecordDecl *Record) { 1011 DeclContext *Owner = Record->getDeclContext(); 1012 1013 // Diagnose whether this anonymous struct/union is an extension. 1014 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1015 Diag(Record->getLocation(), diag::ext_anonymous_union); 1016 else if (!Record->isUnion()) 1017 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1018 1019 // C and C++ require different kinds of checks for anonymous 1020 // structs/unions. 1021 bool Invalid = false; 1022 if (getLangOptions().CPlusPlus) { 1023 const char* PrevSpec = 0; 1024 // C++ [class.union]p3: 1025 // Anonymous unions declared in a named namespace or in the 1026 // global namespace shall be declared static. 1027 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1028 (isa<TranslationUnitDecl>(Owner) || 1029 (isa<NamespaceDecl>(Owner) && 1030 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1031 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1032 Invalid = true; 1033 1034 // Recover by adding 'static'. 1035 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); 1036 } 1037 // C++ [class.union]p3: 1038 // A storage class is not allowed in a declaration of an 1039 // anonymous union in a class scope. 1040 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1041 isa<RecordDecl>(Owner)) { 1042 Diag(DS.getStorageClassSpecLoc(), 1043 diag::err_anonymous_union_with_storage_spec); 1044 Invalid = true; 1045 1046 // Recover by removing the storage specifier. 1047 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1048 PrevSpec); 1049 } 1050 1051 // C++ [class.union]p2: 1052 // The member-specification of an anonymous union shall only 1053 // define non-static data members. [Note: nested types and 1054 // functions cannot be declared within an anonymous union. ] 1055 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1056 MemEnd = Record->decls_end(); 1057 Mem != MemEnd; ++Mem) { 1058 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1059 // C++ [class.union]p3: 1060 // An anonymous union shall not have private or protected 1061 // members (clause 11). 1062 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1063 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1064 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1065 Invalid = true; 1066 } 1067 } else if ((*Mem)->isImplicit()) { 1068 // Any implicit members are fine. 1069 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1070 // This is a type that showed up in an 1071 // elaborated-type-specifier inside the anonymous struct or 1072 // union, but which actually declares a type outside of the 1073 // anonymous struct or union. It's okay. 1074 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1075 if (!MemRecord->isAnonymousStructOrUnion() && 1076 MemRecord->getDeclName()) { 1077 // This is a nested type declaration. 1078 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1079 << (int)Record->isUnion(); 1080 Invalid = true; 1081 } 1082 } else { 1083 // We have something that isn't a non-static data 1084 // member. Complain about it. 1085 unsigned DK = diag::err_anonymous_record_bad_member; 1086 if (isa<TypeDecl>(*Mem)) 1087 DK = diag::err_anonymous_record_with_type; 1088 else if (isa<FunctionDecl>(*Mem)) 1089 DK = diag::err_anonymous_record_with_function; 1090 else if (isa<VarDecl>(*Mem)) 1091 DK = diag::err_anonymous_record_with_static; 1092 Diag((*Mem)->getLocation(), DK) 1093 << (int)Record->isUnion(); 1094 Invalid = true; 1095 } 1096 } 1097 } 1098 1099 if (!Record->isUnion() && !Owner->isRecord()) { 1100 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1101 << (int)getLangOptions().CPlusPlus; 1102 Invalid = true; 1103 } 1104 1105 // Create a declaration for this anonymous struct/union. 1106 NamedDecl *Anon = 0; 1107 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1108 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1109 /*IdentifierInfo=*/0, 1110 Context.getTypeDeclType(Record), 1111 /*BitWidth=*/0, /*Mutable=*/false); 1112 Anon->setAccess(AS_public); 1113 if (getLangOptions().CPlusPlus) 1114 FieldCollector->Add(cast<FieldDecl>(Anon)); 1115 } else { 1116 VarDecl::StorageClass SC; 1117 switch (DS.getStorageClassSpec()) { 1118 default: assert(0 && "Unknown storage class!"); 1119 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1120 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1121 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1122 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1123 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1124 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1125 case DeclSpec::SCS_mutable: 1126 // mutable can only appear on non-static class members, so it's always 1127 // an error here 1128 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1129 Invalid = true; 1130 SC = VarDecl::None; 1131 break; 1132 } 1133 1134 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1135 /*IdentifierInfo=*/0, 1136 Context.getTypeDeclType(Record), 1137 SC, DS.getSourceRange().getBegin()); 1138 } 1139 Anon->setImplicit(); 1140 1141 // Add the anonymous struct/union object to the current 1142 // context. We'll be referencing this object when we refer to one of 1143 // its members. 1144 Owner->addDecl(Anon); 1145 1146 // Inject the members of the anonymous struct/union into the owning 1147 // context and into the identifier resolver chain for name lookup 1148 // purposes. 1149 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1150 Invalid = true; 1151 1152 // Mark this as an anonymous struct/union type. Note that we do not 1153 // do this until after we have already checked and injected the 1154 // members of this anonymous struct/union type, because otherwise 1155 // the members could be injected twice: once by DeclContext when it 1156 // builds its lookup table, and once by 1157 // InjectAnonymousStructOrUnionMembers. 1158 Record->setAnonymousStructOrUnion(true); 1159 1160 if (Invalid) 1161 Anon->setInvalidDecl(); 1162 1163 return Anon; 1164} 1165 1166 1167/// GetNameForDeclarator - Determine the full declaration name for the 1168/// given Declarator. 1169DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1170 switch (D.getKind()) { 1171 case Declarator::DK_Abstract: 1172 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 1173 return DeclarationName(); 1174 1175 case Declarator::DK_Normal: 1176 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 1177 return DeclarationName(D.getIdentifier()); 1178 1179 case Declarator::DK_Constructor: { 1180 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1181 Ty = Context.getCanonicalType(Ty); 1182 return Context.DeclarationNames.getCXXConstructorName(Ty); 1183 } 1184 1185 case Declarator::DK_Destructor: { 1186 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1187 Ty = Context.getCanonicalType(Ty); 1188 return Context.DeclarationNames.getCXXDestructorName(Ty); 1189 } 1190 1191 case Declarator::DK_Conversion: { 1192 // FIXME: We'd like to keep the non-canonical type for diagnostics! 1193 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1194 Ty = Context.getCanonicalType(Ty); 1195 return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 1196 } 1197 1198 case Declarator::DK_Operator: 1199 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 1200 return Context.DeclarationNames.getCXXOperatorName( 1201 D.getOverloadedOperator()); 1202 } 1203 1204 assert(false && "Unknown name kind"); 1205 return DeclarationName(); 1206} 1207 1208/// isNearlyMatchingFunction - Determine whether the C++ functions 1209/// Declaration and Definition are "nearly" matching. This heuristic 1210/// is used to improve diagnostics in the case where an out-of-line 1211/// function definition doesn't match any declaration within 1212/// the class or namespace. 1213static bool isNearlyMatchingFunction(ASTContext &Context, 1214 FunctionDecl *Declaration, 1215 FunctionDecl *Definition) { 1216 if (Declaration->param_size() != Definition->param_size()) 1217 return false; 1218 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1219 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1220 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1221 1222 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1223 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 1224 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1225 return false; 1226 } 1227 1228 return true; 1229} 1230 1231Sema::DeclTy * 1232Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl, 1233 bool IsFunctionDefinition) { 1234 NamedDecl *LastDeclarator = dyn_cast_or_null<NamedDecl>((Decl *)lastDecl); 1235 DeclarationName Name = GetNameForDeclarator(D); 1236 1237 // All of these full declarators require an identifier. If it doesn't have 1238 // one, the ParsedFreeStandingDeclSpec action should be used. 1239 if (!Name) { 1240 if (!D.getInvalidType()) // Reject this if we think it is valid. 1241 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1242 diag::err_declarator_need_ident) 1243 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1244 return 0; 1245 } 1246 1247 // The scope passed in may not be a decl scope. Zip up the scope tree until 1248 // we find one that is. 1249 while ((S->getFlags() & Scope::DeclScope) == 0 || 1250 (S->getFlags() & Scope::TemplateParamScope) != 0) 1251 S = S->getParent(); 1252 1253 DeclContext *DC; 1254 NamedDecl *PrevDecl; 1255 NamedDecl *New; 1256 bool InvalidDecl = false; 1257 1258 QualType R = GetTypeForDeclarator(D, S); 1259 if (R.isNull()) { 1260 InvalidDecl = true; 1261 R = Context.IntTy; 1262 } 1263 1264 // See if this is a redefinition of a variable in the same scope. 1265 if (D.getCXXScopeSpec().isInvalid()) { 1266 DC = CurContext; 1267 PrevDecl = 0; 1268 InvalidDecl = true; 1269 } else if (!D.getCXXScopeSpec().isSet()) { 1270 LookupNameKind NameKind = LookupOrdinaryName; 1271 1272 // If the declaration we're planning to build will be a function 1273 // or object with linkage, then look for another declaration with 1274 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1275 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1276 /* Do nothing*/; 1277 else if (R->isFunctionType()) { 1278 if (CurContext->isFunctionOrMethod()) 1279 NameKind = LookupRedeclarationWithLinkage; 1280 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1281 NameKind = LookupRedeclarationWithLinkage; 1282 1283 DC = CurContext; 1284 PrevDecl = LookupName(S, Name, NameKind, true, 1285 D.getDeclSpec().getStorageClassSpec() != 1286 DeclSpec::SCS_static, 1287 D.getIdentifierLoc()); 1288 } else { // Something like "int foo::x;" 1289 DC = computeDeclContext(D.getCXXScopeSpec()); 1290 // FIXME: RequireCompleteDeclContext(D.getCXXScopeSpec()); ? 1291 PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName, true); 1292 1293 // C++ 7.3.1.2p2: 1294 // Members (including explicit specializations of templates) of a named 1295 // namespace can also be defined outside that namespace by explicit 1296 // qualification of the name being defined, provided that the entity being 1297 // defined was already declared in the namespace and the definition appears 1298 // after the point of declaration in a namespace that encloses the 1299 // declarations namespace. 1300 // 1301 // Note that we only check the context at this point. We don't yet 1302 // have enough information to make sure that PrevDecl is actually 1303 // the declaration we want to match. For example, given: 1304 // 1305 // class X { 1306 // void f(); 1307 // void f(float); 1308 // }; 1309 // 1310 // void X::f(int) { } // ill-formed 1311 // 1312 // In this case, PrevDecl will point to the overload set 1313 // containing the two f's declared in X, but neither of them 1314 // matches. 1315 1316 // First check whether we named the global scope. 1317 if (isa<TranslationUnitDecl>(DC)) { 1318 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1319 << Name << D.getCXXScopeSpec().getRange(); 1320 } else if (!CurContext->Encloses(DC)) { 1321 // The qualifying scope doesn't enclose the original declaration. 1322 // Emit diagnostic based on current scope. 1323 SourceLocation L = D.getIdentifierLoc(); 1324 SourceRange R = D.getCXXScopeSpec().getRange(); 1325 if (isa<FunctionDecl>(CurContext)) 1326 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1327 else 1328 Diag(L, diag::err_invalid_declarator_scope) 1329 << Name << cast<NamedDecl>(DC) << R; 1330 InvalidDecl = true; 1331 } 1332 } 1333 1334 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1335 // Maybe we will complain about the shadowed template parameter. 1336 InvalidDecl = InvalidDecl 1337 || DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 1338 // Just pretend that we didn't see the previous declaration. 1339 PrevDecl = 0; 1340 } 1341 1342 // In C++, the previous declaration we find might be a tag type 1343 // (class or enum). In this case, the new declaration will hide the 1344 // tag type. Note that this does does not apply if we're declaring a 1345 // typedef (C++ [dcl.typedef]p4). 1346 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 1347 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1348 PrevDecl = 0; 1349 1350 bool Redeclaration = false; 1351 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1352 New = ActOnTypedefDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1353 InvalidDecl, Redeclaration); 1354 } else if (R->isFunctionType()) { 1355 New = ActOnFunctionDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1356 IsFunctionDefinition, InvalidDecl, 1357 Redeclaration); 1358 } else { 1359 New = ActOnVariableDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1360 InvalidDecl, Redeclaration); 1361 } 1362 1363 if (New == 0) 1364 return 0; 1365 1366 // If this has an identifier and is not an invalid redeclaration, 1367 // add it to the scope stack. 1368 if (Name && !(Redeclaration && InvalidDecl)) 1369 PushOnScopeChains(New, S); 1370 // If any semantic error occurred, mark the decl as invalid. 1371 if (D.getInvalidType() || InvalidDecl) 1372 New->setInvalidDecl(); 1373 1374 return New; 1375} 1376 1377/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 1378/// types into constant array types in certain situations which would otherwise 1379/// be errors (for GCC compatibility). 1380static QualType TryToFixInvalidVariablyModifiedType(QualType T, 1381 ASTContext &Context, 1382 bool &SizeIsNegative) { 1383 // This method tries to turn a variable array into a constant 1384 // array even when the size isn't an ICE. This is necessary 1385 // for compatibility with code that depends on gcc's buggy 1386 // constant expression folding, like struct {char x[(int)(char*)2];} 1387 SizeIsNegative = false; 1388 1389 if (const PointerType* PTy = dyn_cast<PointerType>(T)) { 1390 QualType Pointee = PTy->getPointeeType(); 1391 QualType FixedType = 1392 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 1393 if (FixedType.isNull()) return FixedType; 1394 FixedType = Context.getPointerType(FixedType); 1395 FixedType.setCVRQualifiers(T.getCVRQualifiers()); 1396 return FixedType; 1397 } 1398 1399 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 1400 if (!VLATy) 1401 return QualType(); 1402 // FIXME: We should probably handle this case 1403 if (VLATy->getElementType()->isVariablyModifiedType()) 1404 return QualType(); 1405 1406 Expr::EvalResult EvalResult; 1407 if (!VLATy->getSizeExpr() || 1408 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 1409 !EvalResult.Val.isInt()) 1410 return QualType(); 1411 1412 llvm::APSInt &Res = EvalResult.Val.getInt(); 1413 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) 1414 return Context.getConstantArrayType(VLATy->getElementType(), 1415 Res, ArrayType::Normal, 0); 1416 1417 SizeIsNegative = true; 1418 return QualType(); 1419} 1420 1421/// \brief Register the given locally-scoped external C declaration so 1422/// that it can be found later for redeclarations 1423void 1424Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, NamedDecl *PrevDecl, 1425 Scope *S) { 1426 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 1427 "Decl is not a locally-scoped decl!"); 1428 // Note that we have a locally-scoped external with this name. 1429 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 1430 1431 if (!PrevDecl) 1432 return; 1433 1434 // If there was a previous declaration of this variable, it may be 1435 // in our identifier chain. Update the identifier chain with the new 1436 // declaration. 1437 if (IdResolver.ReplaceDecl(PrevDecl, ND)) { 1438 // The previous declaration was found on the identifer resolver 1439 // chain, so remove it from its scope. 1440 while (S && !S->isDeclScope(PrevDecl)) 1441 S = S->getParent(); 1442 1443 if (S) 1444 S->RemoveDecl(PrevDecl); 1445 } 1446} 1447 1448NamedDecl* 1449Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1450 QualType R, Decl* LastDeclarator, 1451 Decl* PrevDecl, bool& InvalidDecl, 1452 bool &Redeclaration) { 1453 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1454 if (D.getCXXScopeSpec().isSet()) { 1455 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1456 << D.getCXXScopeSpec().getRange(); 1457 InvalidDecl = true; 1458 // Pretend we didn't see the scope specifier. 1459 DC = 0; 1460 } 1461 1462 if (getLangOptions().CPlusPlus) { 1463 // Check that there are no default arguments (C++ only). 1464 CheckExtraCXXDefaultArguments(D); 1465 1466 if (D.getDeclSpec().isVirtualSpecified()) 1467 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1468 diag::err_virtual_non_function); 1469 } 1470 1471 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, LastDeclarator); 1472 if (!NewTD) return 0; 1473 1474 // Handle attributes prior to checking for duplicates in MergeVarDecl 1475 ProcessDeclAttributes(NewTD, D); 1476 // Merge the decl with the existing one if appropriate. If the decl is 1477 // in an outer scope, it isn't the same thing. 1478 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1479 Redeclaration = true; 1480 if (MergeTypeDefDecl(NewTD, PrevDecl)) 1481 InvalidDecl = true; 1482 } 1483 1484 if (S->getFnParent() == 0) { 1485 QualType T = NewTD->getUnderlyingType(); 1486 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1487 // then it shall have block scope. 1488 if (T->isVariablyModifiedType()) { 1489 bool SizeIsNegative; 1490 QualType FixedTy = 1491 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1492 if (!FixedTy.isNull()) { 1493 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 1494 NewTD->setUnderlyingType(FixedTy); 1495 } else { 1496 if (SizeIsNegative) 1497 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 1498 else if (T->isVariableArrayType()) 1499 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1500 else 1501 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1502 InvalidDecl = true; 1503 } 1504 } 1505 } 1506 return NewTD; 1507} 1508 1509/// \brief Determines whether the given declaration is an out-of-scope 1510/// previous declaration. 1511/// 1512/// This routine should be invoked when name lookup has found a 1513/// previous declaration (PrevDecl) that is not in the scope where a 1514/// new declaration by the same name is being introduced. If the new 1515/// declaration occurs in a local scope, previous declarations with 1516/// linkage may still be considered previous declarations (C99 1517/// 6.2.2p4-5, C++ [basic.link]p6). 1518/// 1519/// \param PrevDecl the previous declaration found by name 1520/// lookup 1521/// 1522/// \param DC the context in which the new declaration is being 1523/// declared. 1524/// 1525/// \returns true if PrevDecl is an out-of-scope previous declaration 1526/// for a new delcaration with the same name. 1527static bool 1528isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 1529 ASTContext &Context) { 1530 if (!PrevDecl) 1531 return 0; 1532 1533 // FIXME: PrevDecl could be an OverloadedFunctionDecl, in which 1534 // case we need to check each of the overloaded functions. 1535 if (!PrevDecl->hasLinkage()) 1536 return false; 1537 1538 if (Context.getLangOptions().CPlusPlus) { 1539 // C++ [basic.link]p6: 1540 // If there is a visible declaration of an entity with linkage 1541 // having the same name and type, ignoring entities declared 1542 // outside the innermost enclosing namespace scope, the block 1543 // scope declaration declares that same entity and receives the 1544 // linkage of the previous declaration. 1545 DeclContext *OuterContext = DC->getLookupContext(); 1546 if (!OuterContext->isFunctionOrMethod()) 1547 // This rule only applies to block-scope declarations. 1548 return false; 1549 else { 1550 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 1551 if (PrevOuterContext->isRecord()) 1552 // We found a member function: ignore it. 1553 return false; 1554 else { 1555 // Find the innermost enclosing namespace for the new and 1556 // previous declarations. 1557 while (!OuterContext->isFileContext()) 1558 OuterContext = OuterContext->getParent(); 1559 while (!PrevOuterContext->isFileContext()) 1560 PrevOuterContext = PrevOuterContext->getParent(); 1561 1562 // The previous declaration is in a different namespace, so it 1563 // isn't the same function. 1564 if (OuterContext->getPrimaryContext() != 1565 PrevOuterContext->getPrimaryContext()) 1566 return false; 1567 } 1568 } 1569 } 1570 1571 return true; 1572} 1573 1574NamedDecl* 1575Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1576 QualType R, Decl* LastDeclarator, 1577 NamedDecl* PrevDecl, bool& InvalidDecl, 1578 bool &Redeclaration) { 1579 DeclarationName Name = GetNameForDeclarator(D); 1580 1581 // Check that there are no default arguments (C++ only). 1582 if (getLangOptions().CPlusPlus) 1583 CheckExtraCXXDefaultArguments(D); 1584 1585 if (R.getTypePtr()->isObjCInterfaceType()) { 1586 Diag(D.getIdentifierLoc(), diag::err_statically_allocated_object); 1587 InvalidDecl = true; 1588 } 1589 1590 VarDecl *NewVD; 1591 VarDecl::StorageClass SC; 1592 switch (D.getDeclSpec().getStorageClassSpec()) { 1593 default: assert(0 && "Unknown storage class!"); 1594 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1595 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1596 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1597 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1598 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1599 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1600 case DeclSpec::SCS_mutable: 1601 // mutable can only appear on non-static class members, so it's always 1602 // an error here 1603 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1604 InvalidDecl = true; 1605 SC = VarDecl::None; 1606 break; 1607 } 1608 1609 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1610 if (!II) { 1611 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1612 << Name.getAsString(); 1613 return 0; 1614 } 1615 1616 if (D.getDeclSpec().isVirtualSpecified()) 1617 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1618 diag::err_virtual_non_function); 1619 1620 bool ThreadSpecified = D.getDeclSpec().isThreadSpecified(); 1621 if (!DC->isRecord() && S->getFnParent() == 0) { 1622 // C99 6.9p2: The storage-class specifiers auto and register shall not 1623 // appear in the declaration specifiers in an external declaration. 1624 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 1625 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 1626 InvalidDecl = true; 1627 } 1628 } 1629 if (DC->isRecord() && !CurContext->isRecord()) { 1630 // This is an out-of-line definition of a static data member. 1631 if (SC == VarDecl::Static) { 1632 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1633 diag::err_static_out_of_line) 1634 << CodeModificationHint::CreateRemoval( 1635 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 1636 } else if (SC == VarDecl::None) 1637 SC = VarDecl::Static; 1638 } 1639 1640 // The variable can not have an abstract class type. 1641 if (RequireNonAbstractType(D.getIdentifierLoc(), R, 2 /* variable type */)) 1642 InvalidDecl = true; 1643 1644 // The variable can not 1645 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1646 II, R, SC, 1647 // FIXME: Move to DeclGroup... 1648 D.getDeclSpec().getSourceRange().getBegin()); 1649 NewVD->setThreadSpecified(ThreadSpecified); 1650 NewVD->setNextDeclarator(LastDeclarator); 1651 1652 // Set the lexical context. If the declarator has a C++ scope specifier, the 1653 // lexical context will be different from the semantic context. 1654 NewVD->setLexicalDeclContext(CurContext); 1655 1656 // Handle attributes prior to checking for duplicates in MergeVarDecl 1657 ProcessDeclAttributes(NewVD, D); 1658 1659 // Handle GNU asm-label extension (encoded as an attribute). 1660 if (Expr *E = (Expr*) D.getAsmLabel()) { 1661 // The parser guarantees this is a string. 1662 StringLiteral *SE = cast<StringLiteral>(E); 1663 NewVD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 1664 SE->getByteLength()))); 1665 } 1666 1667 // Emit an error if an address space was applied to decl with local storage. 1668 // This includes arrays of objects with address space qualifiers, but not 1669 // automatic variables that point to other address spaces. 1670 // ISO/IEC TR 18037 S5.1.2 1671 if (NewVD->hasLocalStorage() && (NewVD->getType().getAddressSpace() != 0)) { 1672 Diag(D.getIdentifierLoc(), diag::err_as_qualified_auto_decl); 1673 InvalidDecl = true; 1674 } 1675 1676 if (NewVD->hasLocalStorage() && NewVD->getType().isObjCGCWeak()) { 1677 Diag(D.getIdentifierLoc(), diag::warn_attribute_weak_on_local); 1678 } 1679 1680 bool isIllegalVLA = R->isVariableArrayType() && NewVD->hasGlobalStorage(); 1681 bool isIllegalVM = R->isVariablyModifiedType() && NewVD->hasLinkage(); 1682 if (isIllegalVLA || isIllegalVM) { 1683 bool SizeIsNegative; 1684 QualType FixedTy = 1685 TryToFixInvalidVariablyModifiedType(R, Context, SizeIsNegative); 1686 if (!FixedTy.isNull()) { 1687 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 1688 NewVD->setType(FixedTy); 1689 } else if (R->isVariableArrayType()) { 1690 NewVD->setInvalidDecl(); 1691 1692 const VariableArrayType *VAT = Context.getAsVariableArrayType(R); 1693 // FIXME: This won't give the correct result for 1694 // int a[10][n]; 1695 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 1696 1697 if (NewVD->isFileVarDecl()) 1698 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 1699 << SizeRange; 1700 else if (NewVD->getStorageClass() == VarDecl::Static) 1701 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 1702 << SizeRange; 1703 else 1704 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 1705 << SizeRange; 1706 } else { 1707 InvalidDecl = true; 1708 1709 if (NewVD->isFileVarDecl()) 1710 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 1711 else 1712 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 1713 } 1714 } 1715 1716 // If name lookup finds a previous declaration that is not in the 1717 // same scope as the new declaration, this may still be an 1718 // acceptable redeclaration. 1719 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 1720 !(NewVD->hasLinkage() && 1721 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 1722 PrevDecl = 0; 1723 1724 if (!PrevDecl && NewVD->isExternC(Context)) { 1725 // Since we did not find anything by this name and we're declaring 1726 // an extern "C" variable, look for a non-visible extern "C" 1727 // declaration with the same name. 1728 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 1729 = LocallyScopedExternalDecls.find(Name); 1730 if (Pos != LocallyScopedExternalDecls.end()) 1731 PrevDecl = Pos->second; 1732 } 1733 1734 // Merge the decl with the existing one if appropriate. 1735 if (PrevDecl) { 1736 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 1737 // The user tried to define a non-static data member 1738 // out-of-line (C++ [dcl.meaning]p1). 1739 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 1740 << D.getCXXScopeSpec().getRange(); 1741 NewVD->Destroy(Context); 1742 return 0; 1743 } 1744 1745 Redeclaration = true; 1746 if (MergeVarDecl(NewVD, PrevDecl)) 1747 InvalidDecl = true; 1748 } else if (D.getCXXScopeSpec().isSet()) { 1749 // No previous declaration in the qualifying scope. 1750 Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 1751 << Name << D.getCXXScopeSpec().getRange(); 1752 InvalidDecl = true; 1753 } 1754 1755 if (!InvalidDecl && R->isVoidType() && !NewVD->hasExternalStorage()) { 1756 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 1757 << R; 1758 InvalidDecl = true; 1759 } 1760 1761 1762 // If this is a locally-scoped extern C variable, update the map of 1763 // such variables. 1764 if (CurContext->isFunctionOrMethod() && NewVD->isExternC(Context) && 1765 !InvalidDecl) 1766 RegisterLocallyScopedExternCDecl(NewVD, PrevDecl, S); 1767 1768 return NewVD; 1769} 1770 1771NamedDecl* 1772Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1773 QualType R, Decl *LastDeclarator, 1774 NamedDecl* PrevDecl, bool IsFunctionDefinition, 1775 bool& InvalidDecl, bool &Redeclaration) { 1776 assert(R.getTypePtr()->isFunctionType()); 1777 1778 DeclarationName Name = GetNameForDeclarator(D); 1779 FunctionDecl::StorageClass SC = FunctionDecl::None; 1780 switch (D.getDeclSpec().getStorageClassSpec()) { 1781 default: assert(0 && "Unknown storage class!"); 1782 case DeclSpec::SCS_auto: 1783 case DeclSpec::SCS_register: 1784 case DeclSpec::SCS_mutable: 1785 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1786 diag::err_typecheck_sclass_func); 1787 InvalidDecl = true; 1788 break; 1789 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 1790 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 1791 case DeclSpec::SCS_static: { 1792 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 1793 // C99 6.7.1p5: 1794 // The declaration of an identifier for a function that has 1795 // block scope shall have no explicit storage-class specifier 1796 // other than extern 1797 // See also (C++ [dcl.stc]p4). 1798 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1799 diag::err_static_block_func); 1800 SC = FunctionDecl::None; 1801 } else 1802 SC = FunctionDecl::Static; 1803 break; 1804 } 1805 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 1806 } 1807 1808 bool isInline = D.getDeclSpec().isInlineSpecified(); 1809 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1810 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 1811 1812 // Check that the return type is not an abstract class type. 1813 if (RequireNonAbstractType(D.getIdentifierLoc(), 1814 R->getAsFunctionType()->getResultType(), 1815 0 /* return type */)) 1816 InvalidDecl = true; 1817 1818 bool isVirtualOkay = false; 1819 FunctionDecl *NewFD; 1820 if (D.getKind() == Declarator::DK_Constructor) { 1821 // This is a C++ constructor declaration. 1822 assert(DC->isRecord() && 1823 "Constructors can only be declared in a member context"); 1824 1825 InvalidDecl = InvalidDecl || CheckConstructorDeclarator(D, R, SC); 1826 1827 // Create the new declaration 1828 NewFD = CXXConstructorDecl::Create(Context, 1829 cast<CXXRecordDecl>(DC), 1830 D.getIdentifierLoc(), Name, R, 1831 isExplicit, isInline, 1832 /*isImplicitlyDeclared=*/false); 1833 1834 if (InvalidDecl) 1835 NewFD->setInvalidDecl(); 1836 } else if (D.getKind() == Declarator::DK_Destructor) { 1837 // This is a C++ destructor declaration. 1838 if (DC->isRecord()) { 1839 InvalidDecl = InvalidDecl || CheckDestructorDeclarator(D, R, SC); 1840 1841 NewFD = CXXDestructorDecl::Create(Context, 1842 cast<CXXRecordDecl>(DC), 1843 D.getIdentifierLoc(), Name, R, 1844 isInline, 1845 /*isImplicitlyDeclared=*/false); 1846 1847 if (InvalidDecl) 1848 NewFD->setInvalidDecl(); 1849 1850 isVirtualOkay = true; 1851 } else { 1852 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 1853 1854 // Create a FunctionDecl to satisfy the function definition parsing 1855 // code path. 1856 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 1857 Name, R, SC, isInline, 1858 /*hasPrototype=*/true, 1859 // FIXME: Move to DeclGroup... 1860 D.getDeclSpec().getSourceRange().getBegin()); 1861 InvalidDecl = true; 1862 NewFD->setInvalidDecl(); 1863 } 1864 } else if (D.getKind() == Declarator::DK_Conversion) { 1865 if (!DC->isRecord()) { 1866 Diag(D.getIdentifierLoc(), 1867 diag::err_conv_function_not_member); 1868 return 0; 1869 } else { 1870 InvalidDecl = InvalidDecl || CheckConversionDeclarator(D, R, SC); 1871 1872 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 1873 D.getIdentifierLoc(), Name, R, 1874 isInline, isExplicit); 1875 1876 if (InvalidDecl) 1877 NewFD->setInvalidDecl(); 1878 1879 isVirtualOkay = true; 1880 } 1881 } else if (DC->isRecord()) { 1882 // This is a C++ method declaration. 1883 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 1884 D.getIdentifierLoc(), Name, R, 1885 (SC == FunctionDecl::Static), isInline); 1886 1887 isVirtualOkay = (SC != FunctionDecl::Static); 1888 } else { 1889 // Determine whether the function was written with a 1890 // prototype. This true when: 1891 // - we're in C++ (where every function has a prototype), 1892 // - there is a prototype in the declarator, or 1893 // - the type R of the function is some kind of typedef or other reference 1894 // to a type name (which eventually refers to a function type). 1895 bool HasPrototype = 1896 getLangOptions().CPlusPlus || 1897 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 1898 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 1899 1900 NewFD = FunctionDecl::Create(Context, DC, 1901 D.getIdentifierLoc(), 1902 Name, R, SC, isInline, HasPrototype, 1903 // FIXME: Move to DeclGroup... 1904 D.getDeclSpec().getSourceRange().getBegin()); 1905 } 1906 NewFD->setNextDeclarator(LastDeclarator); 1907 1908 // Set the lexical context. If the declarator has a C++ 1909 // scope specifier, the lexical context will be different 1910 // from the semantic context. 1911 NewFD->setLexicalDeclContext(CurContext); 1912 1913 // C++ [dcl.fct.spec]p5: 1914 // The virtual specifier shall only be used in declarations of 1915 // nonstatic class member functions that appear within a 1916 // member-specification of a class declaration; see 10.3. 1917 // 1918 // FIXME: Checking the 'virtual' specifier is not sufficient. A 1919 // function is also virtual if it overrides an already virtual 1920 // function. This is important to do here because it's part of the 1921 // declaration. 1922 if (isVirtual && !InvalidDecl) { 1923 if (!isVirtualOkay) { 1924 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1925 diag::err_virtual_non_function); 1926 } else if (!CurContext->isRecord()) { 1927 // 'virtual' was specified outside of the class. 1928 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 1929 << CodeModificationHint::CreateRemoval( 1930 SourceRange(D.getDeclSpec().getVirtualSpecLoc())); 1931 } else { 1932 // Okay: Add virtual to the method. 1933 cast<CXXMethodDecl>(NewFD)->setVirtual(); 1934 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 1935 CurClass->setAggregate(false); 1936 CurClass->setPOD(false); 1937 CurClass->setPolymorphic(true); 1938 } 1939 } 1940 1941 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 1942 !CurContext->isRecord()) { 1943 // C++ [class.static]p1: 1944 // A data or function member of a class may be declared static 1945 // in a class definition, in which case it is a static member of 1946 // the class. 1947 1948 // Complain about the 'static' specifier if it's on an out-of-line 1949 // member function definition. 1950 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1951 diag::err_static_out_of_line) 1952 << CodeModificationHint::CreateRemoval( 1953 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 1954 } 1955 1956 // Handle GNU asm-label extension (encoded as an attribute). 1957 if (Expr *E = (Expr*) D.getAsmLabel()) { 1958 // The parser guarantees this is a string. 1959 StringLiteral *SE = cast<StringLiteral>(E); 1960 NewFD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 1961 SE->getByteLength()))); 1962 } 1963 1964 // Copy the parameter declarations from the declarator D to 1965 // the function declaration NewFD, if they are available. 1966 if (D.getNumTypeObjects() > 0) { 1967 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1968 1969 // Create Decl objects for each parameter, adding them to the 1970 // FunctionDecl. 1971 llvm::SmallVector<ParmVarDecl*, 16> Params; 1972 1973 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 1974 // function that takes no arguments, not a function that takes a 1975 // single void argument. 1976 // We let through "const void" here because Sema::GetTypeForDeclarator 1977 // already checks for that case. 1978 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1979 FTI.ArgInfo[0].Param && 1980 ((ParmVarDecl*)FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 1981 // empty arg list, don't push any params. 1982 ParmVarDecl *Param = (ParmVarDecl*)FTI.ArgInfo[0].Param; 1983 1984 // In C++, the empty parameter-type-list must be spelled "void"; a 1985 // typedef of void is not permitted. 1986 if (getLangOptions().CPlusPlus && 1987 Param->getType().getUnqualifiedType() != Context.VoidTy) { 1988 Diag(Param->getLocation(), diag::ext_param_typedef_of_void); 1989 } 1990 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 1991 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1992 ParmVarDecl *PVD = (ParmVarDecl *)FTI.ArgInfo[i].Param; 1993 1994 // Function parameters cannot have abstract class types. 1995 if (RequireNonAbstractType(PVD->getLocation(), PVD->getType(), 1996 1 /* parameter type */)) 1997 InvalidDecl = true; 1998 Params.push_back(PVD); 1999 } 2000 } 2001 2002 NewFD->setParams(Context, &Params[0], Params.size()); 2003 } else if (R->getAsTypedefType()) { 2004 // When we're declaring a function with a typedef, as in the 2005 // following example, we'll need to synthesize (unnamed) 2006 // parameters for use in the declaration. 2007 // 2008 // @code 2009 // typedef void fn(int); 2010 // fn f; 2011 // @endcode 2012 const FunctionProtoType *FT = R->getAsFunctionProtoType(); 2013 if (!FT) { 2014 // This is a typedef of a function with no prototype, so we 2015 // don't need to do anything. 2016 } else if ((FT->getNumArgs() == 0) || 2017 (FT->getNumArgs() == 1 && !FT->isVariadic() && 2018 FT->getArgType(0)->isVoidType())) { 2019 // This is a zero-argument function. We don't need to do anything. 2020 } else { 2021 // Synthesize a parameter for each argument type. 2022 llvm::SmallVector<ParmVarDecl*, 16> Params; 2023 for (FunctionProtoType::arg_type_iterator ArgType = FT->arg_type_begin(); 2024 ArgType != FT->arg_type_end(); ++ArgType) { 2025 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, 2026 SourceLocation(), 0, 2027 *ArgType, VarDecl::None, 2028 0); 2029 Param->setImplicit(); 2030 Params.push_back(Param); 2031 } 2032 2033 NewFD->setParams(Context, &Params[0], Params.size()); 2034 } 2035 } 2036 2037 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) 2038 InvalidDecl = InvalidDecl || CheckConstructor(Constructor); 2039 else if (isa<CXXDestructorDecl>(NewFD)) { 2040 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 2041 Record->setUserDeclaredDestructor(true); 2042 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 2043 // user-defined destructor. 2044 Record->setPOD(false); 2045 } else if (CXXConversionDecl *Conversion = 2046 dyn_cast<CXXConversionDecl>(NewFD)) 2047 ActOnConversionDeclarator(Conversion); 2048 2049 // Extra checking for C++ overloaded operators (C++ [over.oper]). 2050 if (NewFD->isOverloadedOperator() && 2051 CheckOverloadedOperatorDeclaration(NewFD)) 2052 NewFD->setInvalidDecl(); 2053 2054 // If name lookup finds a previous declaration that is not in the 2055 // same scope as the new declaration, this may still be an 2056 // acceptable redeclaration. 2057 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 2058 !(NewFD->hasLinkage() && 2059 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 2060 PrevDecl = 0; 2061 2062 if (!PrevDecl && NewFD->isExternC(Context)) { 2063 // Since we did not find anything by this name and we're declaring 2064 // an extern "C" function, look for a non-visible extern "C" 2065 // declaration with the same name. 2066 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2067 = LocallyScopedExternalDecls.find(Name); 2068 if (Pos != LocallyScopedExternalDecls.end()) 2069 PrevDecl = Pos->second; 2070 } 2071 2072 // Merge or overload the declaration with an existing declaration of 2073 // the same name, if appropriate. 2074 bool OverloadableAttrRequired = false; 2075 if (PrevDecl) { 2076 // Determine whether NewFD is an overload of PrevDecl or 2077 // a declaration that requires merging. If it's an overload, 2078 // there's no more work to do here; we'll just add the new 2079 // function to the scope. 2080 OverloadedFunctionDecl::function_iterator MatchedDecl; 2081 2082 if (!getLangOptions().CPlusPlus && 2083 AllowOverloadingOfFunction(PrevDecl, Context)) { 2084 OverloadableAttrRequired = true; 2085 2086 // Functions marked "overloadable" must have a prototype (that 2087 // we can't get through declaration merging). 2088 if (!R->getAsFunctionProtoType()) { 2089 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_no_prototype) 2090 << NewFD; 2091 InvalidDecl = true; 2092 Redeclaration = true; 2093 2094 // Turn this into a variadic function with no parameters. 2095 R = Context.getFunctionType(R->getAsFunctionType()->getResultType(), 2096 0, 0, true, 0); 2097 NewFD->setType(R); 2098 } 2099 } 2100 2101 if (PrevDecl && 2102 (!AllowOverloadingOfFunction(PrevDecl, Context) || 2103 !IsOverload(NewFD, PrevDecl, MatchedDecl))) { 2104 Redeclaration = true; 2105 Decl *OldDecl = PrevDecl; 2106 2107 // If PrevDecl was an overloaded function, extract the 2108 // FunctionDecl that matched. 2109 if (isa<OverloadedFunctionDecl>(PrevDecl)) 2110 OldDecl = *MatchedDecl; 2111 2112 // NewFD and PrevDecl represent declarations that need to be 2113 // merged. 2114 if (MergeFunctionDecl(NewFD, OldDecl)) 2115 InvalidDecl = true; 2116 2117 if (!InvalidDecl) { 2118 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 2119 2120 // An out-of-line member function declaration must also be a 2121 // definition (C++ [dcl.meaning]p1). 2122 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 2123 !InvalidDecl) { 2124 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2125 << D.getCXXScopeSpec().getRange(); 2126 NewFD->setInvalidDecl(); 2127 } 2128 } 2129 } 2130 } 2131 2132 if (D.getCXXScopeSpec().isSet() && 2133 (!PrevDecl || !Redeclaration)) { 2134 // The user tried to provide an out-of-line definition for a 2135 // function that is a member of a class or namespace, but there 2136 // was no such member function declared (C++ [class.mfct]p2, 2137 // C++ [namespace.memdef]p2). For example: 2138 // 2139 // class X { 2140 // void f() const; 2141 // }; 2142 // 2143 // void X::f() { } // ill-formed 2144 // 2145 // Complain about this problem, and attempt to suggest close 2146 // matches (e.g., those that differ only in cv-qualifiers and 2147 // whether the parameter types are references). 2148 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 2149 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 2150 InvalidDecl = true; 2151 2152 LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 2153 true); 2154 assert(!Prev.isAmbiguous() && 2155 "Cannot have an ambiguity in previous-declaration lookup"); 2156 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 2157 Func != FuncEnd; ++Func) { 2158 if (isa<FunctionDecl>(*Func) && 2159 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 2160 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 2161 } 2162 2163 PrevDecl = 0; 2164 } 2165 2166 // Handle attributes. We need to have merged decls when handling attributes 2167 // (for example to check for conflicts, etc). 2168 ProcessDeclAttributes(NewFD, D); 2169 AddKnownFunctionAttributes(NewFD); 2170 2171 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 2172 // If a function name is overloadable in C, then every function 2173 // with that name must be marked "overloadable". 2174 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 2175 << Redeclaration << NewFD; 2176 if (PrevDecl) 2177 Diag(PrevDecl->getLocation(), 2178 diag::note_attribute_overloadable_prev_overload); 2179 NewFD->addAttr(::new (Context) OverloadableAttr()); 2180 } 2181 2182 if (getLangOptions().CPlusPlus) { 2183 // In C++, check default arguments now that we have merged decls. Unless 2184 // the lexical context is the class, because in this case this is done 2185 // during delayed parsing anyway. 2186 if (!CurContext->isRecord()) 2187 CheckCXXDefaultArguments(NewFD); 2188 2189 // An out-of-line member function declaration must also be a 2190 // definition (C++ [dcl.meaning]p1). 2191 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && !InvalidDecl) { 2192 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2193 << D.getCXXScopeSpec().getRange(); 2194 InvalidDecl = true; 2195 } 2196 } 2197 2198 // If this is a locally-scoped extern C function, update the 2199 // map of such names. 2200 if (CurContext->isFunctionOrMethod() && NewFD->isExternC(Context) 2201 && !InvalidDecl) 2202 RegisterLocallyScopedExternCDecl(NewFD, PrevDecl, S); 2203 2204 return NewFD; 2205} 2206 2207bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 2208 // FIXME: Need strict checking. In C89, we need to check for 2209 // any assignment, increment, decrement, function-calls, or 2210 // commas outside of a sizeof. In C99, it's the same list, 2211 // except that the aforementioned are allowed in unevaluated 2212 // expressions. Everything else falls under the 2213 // "may accept other forms of constant expressions" exception. 2214 // (We never end up here for C++, so the constant expression 2215 // rules there don't matter.) 2216 if (Init->isConstantInitializer(Context)) 2217 return false; 2218 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 2219 << Init->getSourceRange(); 2220 return true; 2221} 2222 2223void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init) { 2224 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 2225} 2226 2227/// AddInitializerToDecl - Adds the initializer Init to the 2228/// declaration dcl. If DirectInit is true, this is C++ direct 2229/// initialization rather than copy initialization. 2230void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init, bool DirectInit) { 2231 Decl *RealDecl = static_cast<Decl *>(dcl); 2232 // If there is no declaration, there was an error parsing it. Just ignore 2233 // the initializer. 2234 if (RealDecl == 0) 2235 return; 2236 2237 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 2238 // With declarators parsed the way they are, the parser cannot 2239 // distinguish between a normal initializer and a pure-specifier. 2240 // Thus this grotesque test. 2241 IntegerLiteral *IL; 2242 Expr *Init = static_cast<Expr *>(init.get()); 2243 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 2244 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 2245 if (Method->isVirtual()) { 2246 Method->setPure(); 2247 2248 // A class is abstract if at least one function is pure virtual. 2249 cast<CXXRecordDecl>(CurContext)->setAbstract(true); 2250 } else { 2251 Diag(Method->getLocation(), diag::err_non_virtual_pure) 2252 << Method->getDeclName() << Init->getSourceRange(); 2253 Method->setInvalidDecl(); 2254 } 2255 } else { 2256 Diag(Method->getLocation(), diag::err_member_function_initialization) 2257 << Method->getDeclName() << Init->getSourceRange(); 2258 Method->setInvalidDecl(); 2259 } 2260 return; 2261 } 2262 2263 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2264 if (!VDecl) { 2265 if (getLangOptions().CPlusPlus && 2266 RealDecl->getLexicalDeclContext()->isRecord() && 2267 isa<NamedDecl>(RealDecl)) 2268 Diag(RealDecl->getLocation(), diag::err_member_initialization) 2269 << cast<NamedDecl>(RealDecl)->getDeclName(); 2270 else 2271 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2272 RealDecl->setInvalidDecl(); 2273 return; 2274 } 2275 2276 const VarDecl *Def = 0; 2277 if (VDecl->getDefinition(Def)) { 2278 Diag(VDecl->getLocation(), diag::err_redefinition) 2279 << VDecl->getDeclName(); 2280 Diag(Def->getLocation(), diag::note_previous_definition); 2281 VDecl->setInvalidDecl(); 2282 return; 2283 } 2284 2285 // Take ownership of the expression, now that we're sure we have somewhere 2286 // to put it. 2287 Expr *Init = static_cast<Expr *>(init.release()); 2288 assert(Init && "missing initializer"); 2289 2290 // Get the decls type and save a reference for later, since 2291 // CheckInitializerTypes may change it. 2292 QualType DclT = VDecl->getType(), SavT = DclT; 2293 if (VDecl->isBlockVarDecl()) { 2294 VarDecl::StorageClass SC = VDecl->getStorageClass(); 2295 if (SC == VarDecl::Extern) { // C99 6.7.8p5 2296 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2297 VDecl->setInvalidDecl(); 2298 } else if (!VDecl->isInvalidDecl()) { 2299 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2300 VDecl->getDeclName(), DirectInit)) 2301 VDecl->setInvalidDecl(); 2302 2303 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2304 // Don't check invalid declarations to avoid emitting useless diagnostics. 2305 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2306 if (SC == VarDecl::Static) // C99 6.7.8p4. 2307 CheckForConstantInitializer(Init, DclT); 2308 } 2309 } 2310 } else if (VDecl->isStaticDataMember() && 2311 VDecl->getLexicalDeclContext()->isRecord()) { 2312 // This is an in-class initialization for a static data member, e.g., 2313 // 2314 // struct S { 2315 // static const int value = 17; 2316 // }; 2317 2318 // Attach the initializer 2319 VDecl->setInit(Init); 2320 2321 // C++ [class.mem]p4: 2322 // A member-declarator can contain a constant-initializer only 2323 // if it declares a static member (9.4) of const integral or 2324 // const enumeration type, see 9.4.2. 2325 QualType T = VDecl->getType(); 2326 if (!T->isDependentType() && 2327 (!Context.getCanonicalType(T).isConstQualified() || 2328 !T->isIntegralType())) { 2329 Diag(VDecl->getLocation(), diag::err_member_initialization) 2330 << VDecl->getDeclName() << Init->getSourceRange(); 2331 VDecl->setInvalidDecl(); 2332 } else { 2333 // C++ [class.static.data]p4: 2334 // If a static data member is of const integral or const 2335 // enumeration type, its declaration in the class definition 2336 // can specify a constant-initializer which shall be an 2337 // integral constant expression (5.19). 2338 if (!Init->isTypeDependent() && 2339 !Init->getType()->isIntegralType()) { 2340 // We have a non-dependent, non-integral or enumeration type. 2341 Diag(Init->getSourceRange().getBegin(), 2342 diag::err_in_class_initializer_non_integral_type) 2343 << Init->getType() << Init->getSourceRange(); 2344 VDecl->setInvalidDecl(); 2345 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 2346 // Check whether the expression is a constant expression. 2347 llvm::APSInt Value; 2348 SourceLocation Loc; 2349 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 2350 Diag(Loc, diag::err_in_class_initializer_non_constant) 2351 << Init->getSourceRange(); 2352 VDecl->setInvalidDecl(); 2353 } 2354 } 2355 } 2356 } else if (VDecl->isFileVarDecl()) { 2357 if (VDecl->getStorageClass() == VarDecl::Extern) 2358 Diag(VDecl->getLocation(), diag::warn_extern_init); 2359 if (!VDecl->isInvalidDecl()) 2360 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2361 VDecl->getDeclName(), DirectInit)) 2362 VDecl->setInvalidDecl(); 2363 2364 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2365 // Don't check invalid declarations to avoid emitting useless diagnostics. 2366 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2367 // C99 6.7.8p4. All file scoped initializers need to be constant. 2368 CheckForConstantInitializer(Init, DclT); 2369 } 2370 } 2371 // If the type changed, it means we had an incomplete type that was 2372 // completed by the initializer. For example: 2373 // int ary[] = { 1, 3, 5 }; 2374 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2375 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2376 VDecl->setType(DclT); 2377 Init->setType(DclT); 2378 } 2379 2380 // Attach the initializer to the decl. 2381 VDecl->setInit(Init); 2382 return; 2383} 2384 2385void Sema::ActOnUninitializedDecl(DeclTy *dcl) { 2386 Decl *RealDecl = static_cast<Decl *>(dcl); 2387 2388 // If there is no declaration, there was an error parsing it. Just ignore it. 2389 if (RealDecl == 0) 2390 return; 2391 2392 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2393 QualType Type = Var->getType(); 2394 // C++ [dcl.init.ref]p3: 2395 // The initializer can be omitted for a reference only in a 2396 // parameter declaration (8.3.5), in the declaration of a 2397 // function return type, in the declaration of a class member 2398 // within its class declaration (9.2), and where the extern 2399 // specifier is explicitly used. 2400 if (Type->isReferenceType() && 2401 Var->getStorageClass() != VarDecl::Extern && 2402 Var->getStorageClass() != VarDecl::PrivateExtern) { 2403 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2404 << Var->getDeclName() 2405 << SourceRange(Var->getLocation(), Var->getLocation()); 2406 Var->setInvalidDecl(); 2407 return; 2408 } 2409 2410 // C++ [dcl.init]p9: 2411 // 2412 // If no initializer is specified for an object, and the object 2413 // is of (possibly cv-qualified) non-POD class type (or array 2414 // thereof), the object shall be default-initialized; if the 2415 // object is of const-qualified type, the underlying class type 2416 // shall have a user-declared default constructor. 2417 if (getLangOptions().CPlusPlus) { 2418 QualType InitType = Type; 2419 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2420 InitType = Array->getElementType(); 2421 if (Var->getStorageClass() != VarDecl::Extern && 2422 Var->getStorageClass() != VarDecl::PrivateExtern && 2423 InitType->isRecordType()) { 2424 const CXXConstructorDecl *Constructor = 0; 2425 if (!RequireCompleteType(Var->getLocation(), InitType, 2426 diag::err_invalid_incomplete_type_use)) 2427 Constructor 2428 = PerformInitializationByConstructor(InitType, 0, 0, 2429 Var->getLocation(), 2430 SourceRange(Var->getLocation(), 2431 Var->getLocation()), 2432 Var->getDeclName(), 2433 IK_Default); 2434 if (!Constructor) 2435 Var->setInvalidDecl(); 2436 } 2437 } 2438 2439#if 0 2440 // FIXME: Temporarily disabled because we are not properly parsing 2441 // linkage specifications on declarations, e.g., 2442 // 2443 // extern "C" const CGPoint CGPointerZero; 2444 // 2445 // C++ [dcl.init]p9: 2446 // 2447 // If no initializer is specified for an object, and the 2448 // object is of (possibly cv-qualified) non-POD class type (or 2449 // array thereof), the object shall be default-initialized; if 2450 // the object is of const-qualified type, the underlying class 2451 // type shall have a user-declared default 2452 // constructor. Otherwise, if no initializer is specified for 2453 // an object, the object and its subobjects, if any, have an 2454 // indeterminate initial value; if the object or any of its 2455 // subobjects are of const-qualified type, the program is 2456 // ill-formed. 2457 // 2458 // This isn't technically an error in C, so we don't diagnose it. 2459 // 2460 // FIXME: Actually perform the POD/user-defined default 2461 // constructor check. 2462 if (getLangOptions().CPlusPlus && 2463 Context.getCanonicalType(Type).isConstQualified() && 2464 Var->getStorageClass() != VarDecl::Extern) 2465 Diag(Var->getLocation(), diag::err_const_var_requires_init) 2466 << Var->getName() 2467 << SourceRange(Var->getLocation(), Var->getLocation()); 2468#endif 2469 } 2470} 2471 2472/// The declarators are chained together backwards, reverse the list. 2473Sema::DeclTy *Sema::FinalizeDeclaratorGroup(Scope *S, DeclTy *group) { 2474 // Often we have single declarators, handle them quickly. 2475 Decl *Group = static_cast<Decl*>(group); 2476 if (Group == 0) 2477 return 0; 2478 2479 Decl *NewGroup = 0; 2480 if (Group->getNextDeclarator() == 0) 2481 NewGroup = Group; 2482 else { // reverse the list. 2483 while (Group) { 2484 Decl *Next = Group->getNextDeclarator(); 2485 Group->setNextDeclarator(NewGroup); 2486 NewGroup = Group; 2487 Group = Next; 2488 } 2489 } 2490 // Perform semantic analysis that depends on having fully processed both 2491 // the declarator and initializer. 2492 for (Decl *ID = NewGroup; ID; ID = ID->getNextDeclarator()) { 2493 VarDecl *IDecl = dyn_cast<VarDecl>(ID); 2494 if (!IDecl) 2495 continue; 2496 QualType T = IDecl->getType(); 2497 2498 // Block scope. C99 6.7p7: If an identifier for an object is declared with 2499 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 2500 if (IDecl->isBlockVarDecl() && 2501 IDecl->getStorageClass() != VarDecl::Extern) { 2502 if (!IDecl->isInvalidDecl() && 2503 RequireCompleteType(IDecl->getLocation(), T, 2504 diag::err_typecheck_decl_incomplete_type)) 2505 IDecl->setInvalidDecl(); 2506 } 2507 // File scope. C99 6.9.2p2: A declaration of an identifier for and 2508 // object that has file scope without an initializer, and without a 2509 // storage-class specifier or with the storage-class specifier "static", 2510 // constitutes a tentative definition. Note: A tentative definition with 2511 // external linkage is valid (C99 6.2.2p5). 2512 if (IDecl->isTentativeDefinition(Context)) { 2513 QualType CheckType = T; 2514 unsigned DiagID = diag::err_typecheck_decl_incomplete_type; 2515 2516 const IncompleteArrayType *ArrayT = Context.getAsIncompleteArrayType(T); 2517 if (ArrayT) { 2518 CheckType = ArrayT->getElementType(); 2519 DiagID = diag::err_illegal_decl_array_incomplete_type; 2520 } 2521 2522 if (IDecl->isInvalidDecl()) { 2523 // Do nothing with invalid declarations 2524 } else if ((ArrayT || IDecl->getStorageClass() == VarDecl::Static) && 2525 RequireCompleteType(IDecl->getLocation(), CheckType, DiagID)) { 2526 // C99 6.9.2p3: If the declaration of an identifier for an object is 2527 // a tentative definition and has internal linkage (C99 6.2.2p3), the 2528 // declared type shall not be an incomplete type. 2529 IDecl->setInvalidDecl(); 2530 } 2531 } 2532 } 2533 return NewGroup; 2534} 2535 2536/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 2537/// to introduce parameters into function prototype scope. 2538Sema::DeclTy * 2539Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 2540 const DeclSpec &DS = D.getDeclSpec(); 2541 2542 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 2543 VarDecl::StorageClass StorageClass = VarDecl::None; 2544 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2545 StorageClass = VarDecl::Register; 2546 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2547 Diag(DS.getStorageClassSpecLoc(), 2548 diag::err_invalid_storage_class_in_func_decl); 2549 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2550 } 2551 if (DS.isThreadSpecified()) { 2552 Diag(DS.getThreadSpecLoc(), 2553 diag::err_invalid_storage_class_in_func_decl); 2554 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2555 } 2556 2557 // Check that there are no default arguments inside the type of this 2558 // parameter (C++ only). 2559 if (getLangOptions().CPlusPlus) 2560 CheckExtraCXXDefaultArguments(D); 2561 2562 // In this context, we *do not* check D.getInvalidType(). If the declarator 2563 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 2564 // though it will not reflect the user specified type. 2565 QualType parmDeclType = GetTypeForDeclarator(D, S); 2566 2567 assert(!parmDeclType.isNull() && "GetTypeForDeclarator() returned null type"); 2568 2569 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 2570 // Can this happen for params? We already checked that they don't conflict 2571 // among each other. Here they can only shadow globals, which is ok. 2572 IdentifierInfo *II = D.getIdentifier(); 2573 if (II) { 2574 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2575 if (PrevDecl->isTemplateParameter()) { 2576 // Maybe we will complain about the shadowed template parameter. 2577 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2578 // Just pretend that we didn't see the previous declaration. 2579 PrevDecl = 0; 2580 } else if (S->isDeclScope(PrevDecl)) { 2581 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 2582 2583 // Recover by removing the name 2584 II = 0; 2585 D.SetIdentifier(0, D.getIdentifierLoc()); 2586 } 2587 } 2588 } 2589 2590 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 2591 // Doing the promotion here has a win and a loss. The win is the type for 2592 // both Decl's and DeclRefExpr's will match (a convenient invariant for the 2593 // code generator). The loss is the orginal type isn't preserved. For example: 2594 // 2595 // void func(int parmvardecl[5]) { // convert "int [5]" to "int *" 2596 // int blockvardecl[5]; 2597 // sizeof(parmvardecl); // size == 4 2598 // sizeof(blockvardecl); // size == 20 2599 // } 2600 // 2601 // For expressions, all implicit conversions are captured using the 2602 // ImplicitCastExpr AST node (we have no such mechanism for Decl's). 2603 // 2604 // FIXME: If a source translation tool needs to see the original type, then 2605 // we need to consider storing both types (in ParmVarDecl)... 2606 // 2607 if (parmDeclType->isArrayType()) { 2608 // int x[restrict 4] -> int *restrict 2609 parmDeclType = Context.getArrayDecayedType(parmDeclType); 2610 } else if (parmDeclType->isFunctionType()) 2611 parmDeclType = Context.getPointerType(parmDeclType); 2612 2613 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, 2614 D.getIdentifierLoc(), II, 2615 parmDeclType, StorageClass, 2616 0); 2617 2618 if (D.getInvalidType()) 2619 New->setInvalidDecl(); 2620 2621 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 2622 if (D.getCXXScopeSpec().isSet()) { 2623 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 2624 << D.getCXXScopeSpec().getRange(); 2625 New->setInvalidDecl(); 2626 } 2627 // Parameter declarators cannot be interface types. All ObjC objects are 2628 // passed by reference. 2629 if (parmDeclType->isObjCInterfaceType()) { 2630 Diag(D.getIdentifierLoc(), diag::err_object_cannot_be_by_value) 2631 << "passed"; 2632 New->setInvalidDecl(); 2633 } 2634 2635 // Add the parameter declaration into this scope. 2636 S->AddDecl(New); 2637 if (II) 2638 IdResolver.AddDecl(New); 2639 2640 ProcessDeclAttributes(New, D); 2641 return New; 2642 2643} 2644 2645void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D) { 2646 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2647 "Not a function declarator!"); 2648 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2649 2650 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 2651 // for a K&R function. 2652 if (!FTI.hasPrototype) { 2653 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2654 if (FTI.ArgInfo[i].Param == 0) { 2655 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 2656 << FTI.ArgInfo[i].Ident; 2657 // Implicitly declare the argument as type 'int' for lack of a better 2658 // type. 2659 DeclSpec DS; 2660 const char* PrevSpec; // unused 2661 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 2662 PrevSpec); 2663 Declarator ParamD(DS, Declarator::KNRTypeListContext); 2664 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 2665 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 2666 } 2667 } 2668 } 2669} 2670 2671Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 2672 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 2673 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2674 "Not a function declarator!"); 2675 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2676 2677 if (FTI.hasPrototype) { 2678 // FIXME: Diagnose arguments without names in C. 2679 } 2680 2681 Scope *ParentScope = FnBodyScope->getParent(); 2682 2683 return ActOnStartOfFunctionDef(FnBodyScope, 2684 ActOnDeclarator(ParentScope, D, 0, 2685 /*IsFunctionDefinition=*/true)); 2686} 2687 2688Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclTy *D) { 2689 Decl *decl = static_cast<Decl*>(D); 2690 FunctionDecl *FD = cast<FunctionDecl>(decl); 2691 2692 // See if this is a redefinition. 2693 const FunctionDecl *Definition; 2694 if (FD->getBody(Definition)) { 2695 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 2696 Diag(Definition->getLocation(), diag::note_previous_definition); 2697 } 2698 2699 // Builtin functions cannot be defined. 2700 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 2701 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2702 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 2703 FD->setInvalidDecl(); 2704 } 2705 } 2706 2707 // The return type of a function definition must be complete 2708 // (C99 6.9.1p3) 2709 if (FD->getResultType()->isIncompleteType() && 2710 !FD->getResultType()->isVoidType()) { 2711 Diag(FD->getLocation(), diag::err_func_def_incomplete_result) << FD; 2712 FD->setInvalidDecl(); 2713 } 2714 2715 PushDeclContext(FnBodyScope, FD); 2716 2717 // Check the validity of our function parameters 2718 CheckParmsForFunctionDef(FD); 2719 2720 // Introduce our parameters into the function scope 2721 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 2722 ParmVarDecl *Param = FD->getParamDecl(p); 2723 Param->setOwningFunction(FD); 2724 2725 // If this has an identifier, add it to the scope stack. 2726 if (Param->getIdentifier()) 2727 PushOnScopeChains(Param, FnBodyScope); 2728 } 2729 2730 // Checking attributes of current function definition 2731 // dllimport attribute. 2732 if (FD->getAttr<DLLImportAttr>() && (!FD->getAttr<DLLExportAttr>())) { 2733 // dllimport attribute cannot be applied to definition. 2734 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 2735 Diag(FD->getLocation(), 2736 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 2737 << "dllimport"; 2738 FD->setInvalidDecl(); 2739 return FD; 2740 } else { 2741 // If a symbol previously declared dllimport is later defined, the 2742 // attribute is ignored in subsequent references, and a warning is 2743 // emitted. 2744 Diag(FD->getLocation(), 2745 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 2746 << FD->getNameAsCString() << "dllimport"; 2747 } 2748 } 2749 return FD; 2750} 2751 2752static bool StatementCreatesScope(Stmt* S) { 2753 bool result = false; 2754 if (DeclStmt* DS = dyn_cast<DeclStmt>(S)) { 2755 for (DeclStmt::decl_iterator i = DS->decl_begin(); 2756 i != DS->decl_end(); ++i) { 2757 if (VarDecl* D = dyn_cast<VarDecl>(*i)) { 2758 result |= D->getType()->isVariablyModifiedType(); 2759 result |= !!D->getAttr<CleanupAttr>(); 2760 } else if (TypedefDecl* D = dyn_cast<TypedefDecl>(*i)) { 2761 result |= D->getUnderlyingType()->isVariablyModifiedType(); 2762 } 2763 } 2764 } 2765 2766 return result; 2767} 2768 2769void Sema::RecursiveCalcLabelScopes(llvm::DenseMap<Stmt*, void*>& LabelScopeMap, 2770 llvm::DenseMap<void*, Stmt*>& PopScopeMap, 2771 std::vector<void*>& ScopeStack, 2772 Stmt* CurStmt, 2773 Stmt* ParentCompoundStmt) { 2774 for (Stmt::child_iterator i = CurStmt->child_begin(); 2775 i != CurStmt->child_end(); ++i) { 2776 if (!*i) continue; 2777 if (StatementCreatesScope(*i)) { 2778 ScopeStack.push_back(*i); 2779 PopScopeMap[*i] = ParentCompoundStmt; 2780 } else if (isa<LabelStmt>(CurStmt)) { 2781 LabelScopeMap[CurStmt] = ScopeStack.size() ? ScopeStack.back() : 0; 2782 } 2783 if (isa<DeclStmt>(*i)) continue; 2784 Stmt* CurCompound = isa<CompoundStmt>(*i) ? *i : ParentCompoundStmt; 2785 RecursiveCalcLabelScopes(LabelScopeMap, PopScopeMap, ScopeStack, 2786 *i, CurCompound); 2787 } 2788 2789 while (ScopeStack.size() && PopScopeMap[ScopeStack.back()] == CurStmt) { 2790 ScopeStack.pop_back(); 2791 } 2792} 2793 2794void Sema::RecursiveCalcJumpScopes(llvm::DenseMap<Stmt*, void*>& LabelScopeMap, 2795 llvm::DenseMap<void*, Stmt*>& PopScopeMap, 2796 llvm::DenseMap<Stmt*, void*>& GotoScopeMap, 2797 std::vector<void*>& ScopeStack, 2798 Stmt* CurStmt) { 2799 for (Stmt::child_iterator i = CurStmt->child_begin(); 2800 i != CurStmt->child_end(); ++i) { 2801 if (!*i) continue; 2802 if (StatementCreatesScope(*i)) { 2803 ScopeStack.push_back(*i); 2804 } else if (GotoStmt* GS = dyn_cast<GotoStmt>(*i)) { 2805 void* LScope = LabelScopeMap[GS->getLabel()]; 2806 if (LScope) { 2807 bool foundScopeInStack = false; 2808 for (unsigned i = ScopeStack.size(); i > 0; --i) { 2809 if (LScope == ScopeStack[i-1]) { 2810 foundScopeInStack = true; 2811 break; 2812 } 2813 } 2814 if (!foundScopeInStack) { 2815 Diag(GS->getSourceRange().getBegin(), diag::err_goto_into_scope); 2816 } 2817 } 2818 } 2819 if (isa<DeclStmt>(*i)) continue; 2820 RecursiveCalcJumpScopes(LabelScopeMap, PopScopeMap, GotoScopeMap, 2821 ScopeStack, *i); 2822 } 2823 2824 while (ScopeStack.size() && PopScopeMap[ScopeStack.back()] == CurStmt) { 2825 ScopeStack.pop_back(); 2826 } 2827} 2828 2829Sema::DeclTy *Sema::ActOnFinishFunctionBody(DeclTy *D, StmtArg BodyArg) { 2830 Decl *dcl = static_cast<Decl *>(D); 2831 Stmt *Body = static_cast<Stmt*>(BodyArg.release()); 2832 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 2833 FD->setBody(cast<CompoundStmt>(Body)); 2834 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 2835 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 2836 assert(MD == getCurMethodDecl() && "Method parsing confused"); 2837 MD->setBody(cast<CompoundStmt>(Body)); 2838 } else { 2839 Body->Destroy(Context); 2840 return 0; 2841 } 2842 PopDeclContext(); 2843 // Verify and clean out per-function state. 2844 2845 bool HaveLabels = !LabelMap.empty(); 2846 // Check goto/label use. 2847 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 2848 I = LabelMap.begin(), E = LabelMap.end(); I != E; ++I) { 2849 // Verify that we have no forward references left. If so, there was a goto 2850 // or address of a label taken, but no definition of it. Label fwd 2851 // definitions are indicated with a null substmt. 2852 if (I->second->getSubStmt() == 0) { 2853 LabelStmt *L = I->second; 2854 // Emit error. 2855 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 2856 2857 // At this point, we have gotos that use the bogus label. Stitch it into 2858 // the function body so that they aren't leaked and that the AST is well 2859 // formed. 2860 if (Body) { 2861#if 0 2862 // FIXME: Why do this? Having a 'push_back' in CompoundStmt is ugly, 2863 // and the AST is malformed anyway. We should just blow away 'L'. 2864 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 2865 cast<CompoundStmt>(Body)->push_back(L); 2866#else 2867 L->Destroy(Context); 2868#endif 2869 } else { 2870 // The whole function wasn't parsed correctly, just delete this. 2871 L->Destroy(Context); 2872 } 2873 } 2874 } 2875 LabelMap.clear(); 2876 2877 if (!Body) return D; 2878 2879 if (HaveLabels) { 2880 llvm::DenseMap<Stmt*, void*> LabelScopeMap; 2881 llvm::DenseMap<void*, Stmt*> PopScopeMap; 2882 llvm::DenseMap<Stmt*, void*> GotoScopeMap; 2883 std::vector<void*> ScopeStack; 2884 RecursiveCalcLabelScopes(LabelScopeMap, PopScopeMap, ScopeStack, Body, Body); 2885 RecursiveCalcJumpScopes(LabelScopeMap, PopScopeMap, GotoScopeMap, ScopeStack, Body); 2886 } 2887 2888 return D; 2889} 2890 2891/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 2892/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 2893NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 2894 IdentifierInfo &II, Scope *S) { 2895 // Before we produce a declaration for an implicitly defined 2896 // function, see whether there was a locally-scoped declaration of 2897 // this name as a function or variable. If so, use that 2898 // (non-visible) declaration, and complain about it. 2899 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2900 = LocallyScopedExternalDecls.find(&II); 2901 if (Pos != LocallyScopedExternalDecls.end()) { 2902 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 2903 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 2904 return Pos->second; 2905 } 2906 2907 // Extension in C99. Legal in C90, but warn about it. 2908 if (getLangOptions().C99) 2909 Diag(Loc, diag::ext_implicit_function_decl) << &II; 2910 else 2911 Diag(Loc, diag::warn_implicit_function_decl) << &II; 2912 2913 // FIXME: handle stuff like: 2914 // void foo() { extern float X(); } 2915 // void bar() { X(); } <-- implicit decl for X in another scope. 2916 2917 // Set a Declarator for the implicit definition: int foo(); 2918 const char *Dummy; 2919 DeclSpec DS; 2920 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 2921 Error = Error; // Silence warning. 2922 assert(!Error && "Error setting up implicit decl!"); 2923 Declarator D(DS, Declarator::BlockContext); 2924 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 2925 0, 0, 0, Loc, D), 2926 SourceLocation()); 2927 D.SetIdentifier(&II, Loc); 2928 2929 // Insert this function into translation-unit scope. 2930 2931 DeclContext *PrevDC = CurContext; 2932 CurContext = Context.getTranslationUnitDecl(); 2933 2934 FunctionDecl *FD = 2935 dyn_cast<FunctionDecl>(static_cast<Decl*>(ActOnDeclarator(TUScope, D, 0))); 2936 FD->setImplicit(); 2937 2938 CurContext = PrevDC; 2939 2940 AddKnownFunctionAttributes(FD); 2941 2942 return FD; 2943} 2944 2945/// \brief Adds any function attributes that we know a priori based on 2946/// the declaration of this function. 2947/// 2948/// These attributes can apply both to implicitly-declared builtins 2949/// (like __builtin___printf_chk) or to library-declared functions 2950/// like NSLog or printf. 2951void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 2952 if (FD->isInvalidDecl()) 2953 return; 2954 2955 // If this is a built-in function, map its builtin attributes to 2956 // actual attributes. 2957 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 2958 // Handle printf-formatting attributes. 2959 unsigned FormatIdx; 2960 bool HasVAListArg; 2961 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 2962 if (!FD->getAttr<FormatAttr>()) 2963 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 2964 FormatIdx + 2)); 2965 } 2966 2967 // Mark const if we don't care about errno and that is the only 2968 // thing preventing the function from being const. This allows 2969 // IRgen to use LLVM intrinsics for such functions. 2970 if (!getLangOptions().MathErrno && 2971 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 2972 if (!FD->getAttr<ConstAttr>()) 2973 FD->addAttr(::new (Context) ConstAttr()); 2974 } 2975 } 2976 2977 IdentifierInfo *Name = FD->getIdentifier(); 2978 if (!Name) 2979 return; 2980 if ((!getLangOptions().CPlusPlus && 2981 FD->getDeclContext()->isTranslationUnit()) || 2982 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 2983 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 2984 LinkageSpecDecl::lang_c)) { 2985 // Okay: this could be a libc/libm/Objective-C function we know 2986 // about. 2987 } else 2988 return; 2989 2990 unsigned KnownID; 2991 for (KnownID = 0; KnownID != id_num_known_functions; ++KnownID) 2992 if (KnownFunctionIDs[KnownID] == Name) 2993 break; 2994 2995 switch (KnownID) { 2996 case id_NSLog: 2997 case id_NSLogv: 2998 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 2999 // FIXME: We known better than our headers. 3000 const_cast<FormatAttr *>(Format)->setType("printf"); 3001 } else 3002 FD->addAttr(::new (Context) FormatAttr("printf", 1, 2)); 3003 break; 3004 3005 case id_asprintf: 3006 case id_vasprintf: 3007 if (!FD->getAttr<FormatAttr>()) 3008 FD->addAttr(::new (Context) FormatAttr("printf", 2, 3)); 3009 break; 3010 3011 default: 3012 // Unknown function or known function without any attributes to 3013 // add. Do nothing. 3014 break; 3015 } 3016} 3017 3018TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 3019 Decl *LastDeclarator) { 3020 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 3021 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3022 3023 // Scope manipulation handled by caller. 3024 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 3025 D.getIdentifierLoc(), 3026 D.getIdentifier(), 3027 T); 3028 3029 if (TagType *TT = dyn_cast<TagType>(T)) { 3030 TagDecl *TD = TT->getDecl(); 3031 3032 // If the TagDecl that the TypedefDecl points to is an anonymous decl 3033 // keep track of the TypedefDecl. 3034 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 3035 TD->setTypedefForAnonDecl(NewTD); 3036 } 3037 3038 NewTD->setNextDeclarator(LastDeclarator); 3039 if (D.getInvalidType()) 3040 NewTD->setInvalidDecl(); 3041 return NewTD; 3042} 3043 3044/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 3045/// former case, Name will be non-null. In the later case, Name will be null. 3046/// TagSpec indicates what kind of tag this is. TK indicates whether this is a 3047/// reference/declaration/definition of a tag. 3048Sema::DeclTy *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, 3049 SourceLocation KWLoc, const CXXScopeSpec &SS, 3050 IdentifierInfo *Name, SourceLocation NameLoc, 3051 AttributeList *Attr) { 3052 // If this is not a definition, it must have a name. 3053 assert((Name != 0 || TK == TK_Definition) && 3054 "Nameless record must be a definition!"); 3055 3056 TagDecl::TagKind Kind; 3057 switch (TagSpec) { 3058 default: assert(0 && "Unknown tag type!"); 3059 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 3060 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 3061 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 3062 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 3063 } 3064 3065 DeclContext *SearchDC = CurContext; 3066 DeclContext *DC = CurContext; 3067 NamedDecl *PrevDecl = 0; 3068 3069 bool Invalid = false; 3070 3071 if (Name && SS.isNotEmpty()) { 3072 // We have a nested-name tag ('struct foo::bar'). 3073 3074 // Check for invalid 'foo::'. 3075 if (SS.isInvalid()) { 3076 Name = 0; 3077 goto CreateNewDecl; 3078 } 3079 3080 // FIXME: RequireCompleteDeclContext(SS)? 3081 DC = computeDeclContext(SS); 3082 SearchDC = DC; 3083 // Look-up name inside 'foo::'. 3084 PrevDecl = dyn_cast_or_null<TagDecl>( 3085 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 3086 3087 // A tag 'foo::bar' must already exist. 3088 if (PrevDecl == 0) { 3089 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 3090 Name = 0; 3091 goto CreateNewDecl; 3092 } 3093 } else if (Name) { 3094 // If this is a named struct, check to see if there was a previous forward 3095 // declaration or definition. 3096 // FIXME: We're looking into outer scopes here, even when we 3097 // shouldn't be. Doing so can result in ambiguities that we 3098 // shouldn't be diagnosing. 3099 LookupResult R = LookupName(S, Name, LookupTagName, 3100 /*RedeclarationOnly=*/(TK != TK_Reference)); 3101 if (R.isAmbiguous()) { 3102 DiagnoseAmbiguousLookup(R, Name, NameLoc); 3103 // FIXME: This is not best way to recover from case like: 3104 // 3105 // struct S s; 3106 // 3107 // causes needless err_ovl_no_viable_function_in_init latter. 3108 Name = 0; 3109 PrevDecl = 0; 3110 Invalid = true; 3111 } 3112 else 3113 PrevDecl = R; 3114 3115 if (!getLangOptions().CPlusPlus && TK != TK_Reference) { 3116 // FIXME: This makes sure that we ignore the contexts associated 3117 // with C structs, unions, and enums when looking for a matching 3118 // tag declaration or definition. See the similar lookup tweak 3119 // in Sema::LookupName; is there a better way to deal with this? 3120 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 3121 SearchDC = SearchDC->getParent(); 3122 } 3123 } 3124 3125 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3126 // Maybe we will complain about the shadowed template parameter. 3127 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 3128 // Just pretend that we didn't see the previous declaration. 3129 PrevDecl = 0; 3130 } 3131 3132 if (PrevDecl) { 3133 // Check whether the previous declaration is usable. 3134 (void)DiagnoseUseOfDecl(PrevDecl, NameLoc); 3135 3136 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 3137 // If this is a use of a previous tag, or if the tag is already declared 3138 // in the same scope (so that the definition/declaration completes or 3139 // rementions the tag), reuse the decl. 3140 if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { 3141 // Make sure that this wasn't declared as an enum and now used as a 3142 // struct or something similar. 3143 if (PrevTagDecl->getTagKind() != Kind) { 3144 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 3145 Diag(PrevDecl->getLocation(), diag::note_previous_use); 3146 // Recover by making this an anonymous redefinition. 3147 Name = 0; 3148 PrevDecl = 0; 3149 Invalid = true; 3150 } else { 3151 // If this is a use, just return the declaration we found. 3152 3153 // FIXME: In the future, return a variant or some other clue 3154 // for the consumer of this Decl to know it doesn't own it. 3155 // For our current ASTs this shouldn't be a problem, but will 3156 // need to be changed with DeclGroups. 3157 if (TK == TK_Reference) 3158 return PrevDecl; 3159 3160 // Diagnose attempts to redefine a tag. 3161 if (TK == TK_Definition) { 3162 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 3163 Diag(NameLoc, diag::err_redefinition) << Name; 3164 Diag(Def->getLocation(), diag::note_previous_definition); 3165 // If this is a redefinition, recover by making this 3166 // struct be anonymous, which will make any later 3167 // references get the previous definition. 3168 Name = 0; 3169 PrevDecl = 0; 3170 Invalid = true; 3171 } else { 3172 // If the type is currently being defined, complain 3173 // about a nested redefinition. 3174 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 3175 if (Tag->isBeingDefined()) { 3176 Diag(NameLoc, diag::err_nested_redefinition) << Name; 3177 Diag(PrevTagDecl->getLocation(), 3178 diag::note_previous_definition); 3179 Name = 0; 3180 PrevDecl = 0; 3181 Invalid = true; 3182 } 3183 } 3184 3185 // Okay, this is definition of a previously declared or referenced 3186 // tag PrevDecl. We're going to create a new Decl for it. 3187 } 3188 } 3189 // If we get here we have (another) forward declaration or we 3190 // have a definition. Just create a new decl. 3191 } else { 3192 // If we get here, this is a definition of a new tag type in a nested 3193 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 3194 // new decl/type. We set PrevDecl to NULL so that the entities 3195 // have distinct types. 3196 PrevDecl = 0; 3197 } 3198 // If we get here, we're going to create a new Decl. If PrevDecl 3199 // is non-NULL, it's a definition of the tag declared by 3200 // PrevDecl. If it's NULL, we have a new definition. 3201 } else { 3202 // PrevDecl is a namespace, template, or anything else 3203 // that lives in the IDNS_Tag identifier namespace. 3204 if (isDeclInScope(PrevDecl, SearchDC, S)) { 3205 // The tag name clashes with a namespace name, issue an error and 3206 // recover by making this tag be anonymous. 3207 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 3208 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3209 Name = 0; 3210 PrevDecl = 0; 3211 Invalid = true; 3212 } else { 3213 // The existing declaration isn't relevant to us; we're in a 3214 // new scope, so clear out the previous declaration. 3215 PrevDecl = 0; 3216 } 3217 } 3218 } else if (TK == TK_Reference && SS.isEmpty() && Name && 3219 (Kind != TagDecl::TK_enum || !getLangOptions().CPlusPlus)) { 3220 // C.scope.pdecl]p5: 3221 // -- for an elaborated-type-specifier of the form 3222 // 3223 // class-key identifier 3224 // 3225 // if the elaborated-type-specifier is used in the 3226 // decl-specifier-seq or parameter-declaration-clause of a 3227 // function defined in namespace scope, the identifier is 3228 // declared as a class-name in the namespace that contains 3229 // the declaration; otherwise, except as a friend 3230 // declaration, the identifier is declared in the smallest 3231 // non-class, non-function-prototype scope that contains the 3232 // declaration. 3233 // 3234 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 3235 // C structs and unions. 3236 // 3237 // GNU C also supports this behavior as part of its incomplete 3238 // enum types extension, while GNU C++ does not. 3239 // 3240 // Find the context where we'll be declaring the tag. 3241 // FIXME: We would like to maintain the current DeclContext as the 3242 // lexical context, 3243 while (SearchDC->isRecord()) 3244 SearchDC = SearchDC->getParent(); 3245 3246 // Find the scope where we'll be declaring the tag. 3247 while (S->isClassScope() || 3248 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 3249 ((S->getFlags() & Scope::DeclScope) == 0) || 3250 (S->getEntity() && 3251 ((DeclContext *)S->getEntity())->isTransparentContext())) 3252 S = S->getParent(); 3253 } 3254 3255CreateNewDecl: 3256 3257 // If there is an identifier, use the location of the identifier as the 3258 // location of the decl, otherwise use the location of the struct/union 3259 // keyword. 3260 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 3261 3262 // Otherwise, create a new declaration. If there is a previous 3263 // declaration of the same entity, the two will be linked via 3264 // PrevDecl. 3265 TagDecl *New; 3266 3267 if (Kind == TagDecl::TK_enum) { 3268 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3269 // enum X { A, B, C } D; D should chain to X. 3270 New = EnumDecl::Create(Context, SearchDC, Loc, Name, 3271 cast_or_null<EnumDecl>(PrevDecl)); 3272 // If this is an undefined enum, warn. 3273 if (TK != TK_Definition && !Invalid) { 3274 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 3275 : diag::ext_forward_ref_enum; 3276 Diag(Loc, DK); 3277 } 3278 } else { 3279 // struct/union/class 3280 3281 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3282 // struct X { int A; } D; D should chain to X. 3283 if (getLangOptions().CPlusPlus) 3284 // FIXME: Look for a way to use RecordDecl for simple structs. 3285 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3286 cast_or_null<CXXRecordDecl>(PrevDecl)); 3287 else 3288 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3289 cast_or_null<RecordDecl>(PrevDecl)); 3290 } 3291 3292 if (Kind != TagDecl::TK_enum) { 3293 // Handle #pragma pack: if the #pragma pack stack has non-default 3294 // alignment, make up a packed attribute for this decl. These 3295 // attributes are checked when the ASTContext lays out the 3296 // structure. 3297 // 3298 // It is important for implementing the correct semantics that this 3299 // happen here (in act on tag decl). The #pragma pack stack is 3300 // maintained as a result of parser callbacks which can occur at 3301 // many points during the parsing of a struct declaration (because 3302 // the #pragma tokens are effectively skipped over during the 3303 // parsing of the struct). 3304 if (unsigned Alignment = getPragmaPackAlignment()) 3305 New->addAttr(::new (Context) PackedAttr(Alignment * 8)); 3306 } 3307 3308 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 3309 // C++ [dcl.typedef]p3: 3310 // [...] Similarly, in a given scope, a class or enumeration 3311 // shall not be declared with the same name as a typedef-name 3312 // that is declared in that scope and refers to a type other 3313 // than the class or enumeration itself. 3314 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 3315 TypedefDecl *PrevTypedef = 0; 3316 if (Lookup.getKind() == LookupResult::Found) 3317 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 3318 3319 if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && 3320 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 3321 Context.getCanonicalType(Context.getTypeDeclType(New))) { 3322 Diag(Loc, diag::err_tag_definition_of_typedef) 3323 << Context.getTypeDeclType(New) 3324 << PrevTypedef->getUnderlyingType(); 3325 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 3326 Invalid = true; 3327 } 3328 } 3329 3330 if (Invalid) 3331 New->setInvalidDecl(); 3332 3333 if (Attr) 3334 ProcessDeclAttributeList(New, Attr); 3335 3336 // If we're declaring or defining a tag in function prototype scope 3337 // in C, note that this type can only be used within the function. 3338 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 3339 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 3340 3341 // Set the lexical context. If the tag has a C++ scope specifier, the 3342 // lexical context will be different from the semantic context. 3343 New->setLexicalDeclContext(CurContext); 3344 3345 if (TK == TK_Definition) 3346 New->startDefinition(); 3347 3348 // If this has an identifier, add it to the scope stack. 3349 if (Name) { 3350 S = getNonFieldDeclScope(S); 3351 PushOnScopeChains(New, S); 3352 } else { 3353 CurContext->addDecl(New); 3354 } 3355 3356 return New; 3357} 3358 3359void Sema::ActOnTagStartDefinition(Scope *S, DeclTy *TagD) { 3360 AdjustDeclIfTemplate(TagD); 3361 TagDecl *Tag = cast<TagDecl>((Decl *)TagD); 3362 3363 // Enter the tag context. 3364 PushDeclContext(S, Tag); 3365 3366 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 3367 FieldCollector->StartClass(); 3368 3369 if (Record->getIdentifier()) { 3370 // C++ [class]p2: 3371 // [...] The class-name is also inserted into the scope of the 3372 // class itself; this is known as the injected-class-name. For 3373 // purposes of access checking, the injected-class-name is treated 3374 // as if it were a public member name. 3375 RecordDecl *InjectedClassName 3376 = CXXRecordDecl::Create(Context, Record->getTagKind(), 3377 CurContext, Record->getLocation(), 3378 Record->getIdentifier(), Record); 3379 InjectedClassName->setImplicit(); 3380 PushOnScopeChains(InjectedClassName, S); 3381 } 3382 } 3383} 3384 3385void Sema::ActOnTagFinishDefinition(Scope *S, DeclTy *TagD) { 3386 AdjustDeclIfTemplate(TagD); 3387 TagDecl *Tag = cast<TagDecl>((Decl *)TagD); 3388 3389 if (isa<CXXRecordDecl>(Tag)) 3390 FieldCollector->FinishClass(); 3391 3392 // Exit this scope of this tag's definition. 3393 PopDeclContext(); 3394 3395 // Notify the consumer that we've defined a tag. 3396 Consumer.HandleTagDeclDefinition(Tag); 3397} 3398 3399bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 3400 QualType FieldTy, const Expr *BitWidth) { 3401 // C99 6.7.2.1p4 - verify the field type. 3402 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 3403 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 3404 // Handle incomplete types with specific error. 3405 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 3406 return true; 3407 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 3408 << FieldName << FieldTy << BitWidth->getSourceRange(); 3409 } 3410 3411 // If the bit-width is type- or value-dependent, don't try to check 3412 // it now. 3413 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 3414 return false; 3415 3416 llvm::APSInt Value; 3417 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 3418 return true; 3419 3420 // Zero-width bitfield is ok for anonymous field. 3421 if (Value == 0 && FieldName) 3422 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 3423 3424 if (Value.isSigned() && Value.isNegative()) 3425 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 3426 << FieldName << Value.toString(10); 3427 3428 if (!FieldTy->isDependentType()) { 3429 uint64_t TypeSize = Context.getTypeSize(FieldTy); 3430 // FIXME: We won't need the 0 size once we check that the field type is valid. 3431 if (TypeSize && Value.getZExtValue() > TypeSize) 3432 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 3433 << FieldName << (unsigned)TypeSize; 3434 } 3435 3436 return false; 3437} 3438 3439/// ActOnField - Each field of a struct/union/class is passed into this in order 3440/// to create a FieldDecl object for it. 3441Sema::DeclTy *Sema::ActOnField(Scope *S, DeclTy *TagD, 3442 SourceLocation DeclStart, 3443 Declarator &D, ExprTy *BitfieldWidth) { 3444 3445 return HandleField(S, static_cast<RecordDecl*>(TagD), DeclStart, D, 3446 static_cast<Expr*>(BitfieldWidth), 3447 AS_public); 3448} 3449 3450/// HandleField - Analyze a field of a C struct or a C++ data member. 3451/// 3452FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 3453 SourceLocation DeclStart, 3454 Declarator &D, Expr *BitWidth, 3455 AccessSpecifier AS) { 3456 IdentifierInfo *II = D.getIdentifier(); 3457 SourceLocation Loc = DeclStart; 3458 if (II) Loc = D.getIdentifierLoc(); 3459 3460 QualType T = GetTypeForDeclarator(D, S); 3461 3462 if (getLangOptions().CPlusPlus) { 3463 CheckExtraCXXDefaultArguments(D); 3464 3465 if (D.getDeclSpec().isVirtualSpecified()) 3466 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3467 diag::err_virtual_non_function); 3468 } 3469 3470 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3471 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 3472 PrevDecl = 0; 3473 3474 FieldDecl *NewFD 3475 = CheckFieldDecl(II, T, Record, Loc, 3476 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable, 3477 BitWidth, AS, PrevDecl, &D); 3478 if (NewFD->isInvalidDecl() && PrevDecl) { 3479 // Don't introduce NewFD into scope; there's already something 3480 // with the same name in the same scope. 3481 } else if (II) { 3482 PushOnScopeChains(NewFD, S); 3483 } else 3484 Record->addDecl(NewFD); 3485 3486 return NewFD; 3487} 3488 3489/// \brief Build a new FieldDecl and check its well-formedness. 3490/// 3491/// This routine builds a new FieldDecl given the fields name, type, 3492/// record, etc. \p PrevDecl should refer to any previous declaration 3493/// with the same name and in the same scope as the field to be 3494/// created. 3495/// 3496/// \returns a new FieldDecl. 3497/// 3498/// \todo The Declarator argument is a hack. It will be removed once 3499FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 3500 RecordDecl *Record, SourceLocation Loc, 3501 bool Mutable, Expr *BitWidth, 3502 AccessSpecifier AS, NamedDecl *PrevDecl, 3503 Declarator *D) { 3504 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3505 bool InvalidDecl = false; 3506 3507 // If we receive a broken type, recover by assuming 'int' and 3508 // marking this declaration as invalid. 3509 if (T.isNull()) { 3510 InvalidDecl = true; 3511 T = Context.IntTy; 3512 } 3513 3514 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3515 // than a variably modified type. 3516 if (T->isVariablyModifiedType()) { 3517 bool SizeIsNegative; 3518 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 3519 SizeIsNegative); 3520 if (!FixedTy.isNull()) { 3521 Diag(Loc, diag::warn_illegal_constant_array_size); 3522 T = FixedTy; 3523 } else { 3524 if (SizeIsNegative) 3525 Diag(Loc, diag::err_typecheck_negative_array_size); 3526 else 3527 Diag(Loc, diag::err_typecheck_field_variable_size); 3528 T = Context.IntTy; 3529 InvalidDecl = true; 3530 } 3531 } 3532 3533 // Fields can not have abstract class types 3534 if (RequireNonAbstractType(Loc, T, 3 /* field type */)) 3535 InvalidDecl = true; 3536 3537 // If this is declared as a bit-field, check the bit-field. 3538 if (BitWidth && VerifyBitField(Loc, II, T, BitWidth)) { 3539 InvalidDecl = true; 3540 DeleteExpr(BitWidth); 3541 BitWidth = 0; 3542 } 3543 3544 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, BitWidth, 3545 Mutable); 3546 3547 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 3548 Diag(Loc, diag::err_duplicate_member) << II; 3549 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3550 NewFD->setInvalidDecl(); 3551 Record->setInvalidDecl(); 3552 } 3553 3554 if (getLangOptions().CPlusPlus && !T->isPODType()) 3555 cast<CXXRecordDecl>(Record)->setPOD(false); 3556 3557 // FIXME: We need to pass in the attributes given an AST 3558 // representation, not a parser representation. 3559 if (D) 3560 ProcessDeclAttributes(NewFD, *D); 3561 3562 if (T.isObjCGCWeak()) 3563 Diag(Loc, diag::warn_attribute_weak_on_field); 3564 3565 if (InvalidDecl) 3566 NewFD->setInvalidDecl(); 3567 3568 NewFD->setAccess(AS); 3569 3570 // C++ [dcl.init.aggr]p1: 3571 // An aggregate is an array or a class (clause 9) with [...] no 3572 // private or protected non-static data members (clause 11). 3573 // A POD must be an aggregate. 3574 if (getLangOptions().CPlusPlus && 3575 (AS == AS_private || AS == AS_protected)) { 3576 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 3577 CXXRecord->setAggregate(false); 3578 CXXRecord->setPOD(false); 3579 } 3580 3581 return NewFD; 3582} 3583 3584/// TranslateIvarVisibility - Translate visibility from a token ID to an 3585/// AST enum value. 3586static ObjCIvarDecl::AccessControl 3587TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 3588 switch (ivarVisibility) { 3589 default: assert(0 && "Unknown visitibility kind"); 3590 case tok::objc_private: return ObjCIvarDecl::Private; 3591 case tok::objc_public: return ObjCIvarDecl::Public; 3592 case tok::objc_protected: return ObjCIvarDecl::Protected; 3593 case tok::objc_package: return ObjCIvarDecl::Package; 3594 } 3595} 3596 3597/// ActOnIvar - Each ivar field of an objective-c class is passed into this 3598/// in order to create an IvarDecl object for it. 3599Sema::DeclTy *Sema::ActOnIvar(Scope *S, 3600 SourceLocation DeclStart, 3601 Declarator &D, ExprTy *BitfieldWidth, 3602 tok::ObjCKeywordKind Visibility) { 3603 3604 IdentifierInfo *II = D.getIdentifier(); 3605 Expr *BitWidth = (Expr*)BitfieldWidth; 3606 SourceLocation Loc = DeclStart; 3607 if (II) Loc = D.getIdentifierLoc(); 3608 3609 // FIXME: Unnamed fields can be handled in various different ways, for 3610 // example, unnamed unions inject all members into the struct namespace! 3611 3612 QualType T = GetTypeForDeclarator(D, S); 3613 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3614 bool InvalidDecl = false; 3615 3616 if (BitWidth) { 3617 // 6.7.2.1p3, 6.7.2.1p4 3618 if (VerifyBitField(Loc, II, T, BitWidth)) { 3619 InvalidDecl = true; 3620 DeleteExpr(BitWidth); 3621 BitWidth = 0; 3622 } 3623 } else { 3624 // Not a bitfield. 3625 3626 // validate II. 3627 3628 } 3629 3630 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3631 // than a variably modified type. 3632 if (T->isVariablyModifiedType()) { 3633 Diag(Loc, diag::err_typecheck_ivar_variable_size); 3634 InvalidDecl = true; 3635 } 3636 3637 // Get the visibility (access control) for this ivar. 3638 ObjCIvarDecl::AccessControl ac = 3639 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 3640 : ObjCIvarDecl::None; 3641 3642 // Construct the decl. 3643 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, CurContext, Loc, II, T,ac, 3644 (Expr *)BitfieldWidth); 3645 3646 if (II) { 3647 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3648 if (PrevDecl && isDeclInScope(PrevDecl, CurContext, S) 3649 && !isa<TagDecl>(PrevDecl)) { 3650 Diag(Loc, diag::err_duplicate_member) << II; 3651 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3652 NewID->setInvalidDecl(); 3653 } 3654 } 3655 3656 // Process attributes attached to the ivar. 3657 ProcessDeclAttributes(NewID, D); 3658 3659 if (D.getInvalidType() || InvalidDecl) 3660 NewID->setInvalidDecl(); 3661 3662 if (II) { 3663 // FIXME: When interfaces are DeclContexts, we'll need to add 3664 // these to the interface. 3665 S->AddDecl(NewID); 3666 IdResolver.AddDecl(NewID); 3667 } 3668 3669 return NewID; 3670} 3671 3672void Sema::ActOnFields(Scope* S, 3673 SourceLocation RecLoc, DeclTy *RecDecl, 3674 DeclTy **Fields, unsigned NumFields, 3675 SourceLocation LBrac, SourceLocation RBrac, 3676 AttributeList *Attr) { 3677 Decl *EnclosingDecl = static_cast<Decl*>(RecDecl); 3678 assert(EnclosingDecl && "missing record or interface decl"); 3679 3680 // If the decl this is being inserted into is invalid, then it may be a 3681 // redeclaration or some other bogus case. Don't try to add fields to it. 3682 if (EnclosingDecl->isInvalidDecl()) { 3683 // FIXME: Deallocate fields? 3684 return; 3685 } 3686 3687 3688 // Verify that all the fields are okay. 3689 unsigned NumNamedMembers = 0; 3690 llvm::SmallVector<FieldDecl*, 32> RecFields; 3691 3692 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 3693 for (unsigned i = 0; i != NumFields; ++i) { 3694 FieldDecl *FD = cast_or_null<FieldDecl>(static_cast<Decl*>(Fields[i])); 3695 assert(FD && "missing field decl"); 3696 3697 // Get the type for the field. 3698 Type *FDTy = FD->getType().getTypePtr(); 3699 3700 if (!FD->isAnonymousStructOrUnion()) { 3701 // Remember all fields written by the user. 3702 RecFields.push_back(FD); 3703 } 3704 3705 // If the field is already invalid for some reason, don't emit more 3706 // diagnostics about it. 3707 if (FD->isInvalidDecl()) 3708 continue; 3709 3710 // C99 6.7.2.1p2 - A field may not be a function type. 3711 if (FDTy->isFunctionType()) { 3712 Diag(FD->getLocation(), diag::err_field_declared_as_function) 3713 << FD->getDeclName(); 3714 FD->setInvalidDecl(); 3715 EnclosingDecl->setInvalidDecl(); 3716 continue; 3717 } 3718 // C99 6.7.2.1p2 - A field may not be an incomplete type except... 3719 if (FDTy->isIncompleteType()) { 3720 if (!Record) { // Incomplete ivar type is always an error. 3721 RequireCompleteType(FD->getLocation(), FD->getType(), 3722 diag::err_field_incomplete); 3723 FD->setInvalidDecl(); 3724 EnclosingDecl->setInvalidDecl(); 3725 continue; 3726 } 3727 if (i != NumFields-1 || // ... that the last member ... 3728 !Record->isStruct() || // ... of a structure ... 3729 !FDTy->isArrayType()) { //... may have incomplete array type. 3730 RequireCompleteType(FD->getLocation(), FD->getType(), 3731 diag::err_field_incomplete); 3732 FD->setInvalidDecl(); 3733 EnclosingDecl->setInvalidDecl(); 3734 continue; 3735 } 3736 if (NumNamedMembers < 1) { //... must have more than named member ... 3737 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 3738 << FD->getDeclName(); 3739 FD->setInvalidDecl(); 3740 EnclosingDecl->setInvalidDecl(); 3741 continue; 3742 } 3743 // Okay, we have a legal flexible array member at the end of the struct. 3744 if (Record) 3745 Record->setHasFlexibleArrayMember(true); 3746 } 3747 /// C99 6.7.2.1p2 - a struct ending in a flexible array member cannot be the 3748 /// field of another structure or the element of an array. 3749 if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 3750 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 3751 // If this is a member of a union, then entire union becomes "flexible". 3752 if (Record && Record->isUnion()) { 3753 Record->setHasFlexibleArrayMember(true); 3754 } else { 3755 // If this is a struct/class and this is not the last element, reject 3756 // it. Note that GCC supports variable sized arrays in the middle of 3757 // structures. 3758 if (i != NumFields-1) 3759 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 3760 << FD->getDeclName(); 3761 else { 3762 // We support flexible arrays at the end of structs in 3763 // other structs as an extension. 3764 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 3765 << FD->getDeclName(); 3766 if (Record) 3767 Record->setHasFlexibleArrayMember(true); 3768 } 3769 } 3770 } 3771 } 3772 /// A field cannot be an Objective-c object 3773 if (FDTy->isObjCInterfaceType()) { 3774 Diag(FD->getLocation(), diag::err_statically_allocated_object); 3775 FD->setInvalidDecl(); 3776 EnclosingDecl->setInvalidDecl(); 3777 continue; 3778 } 3779 // Keep track of the number of named members. 3780 if (FD->getIdentifier()) 3781 ++NumNamedMembers; 3782 } 3783 3784 // Okay, we successfully defined 'Record'. 3785 if (Record) { 3786 Record->completeDefinition(Context); 3787 } else { 3788 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 3789 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 3790 ID->setIVarList(ClsFields, RecFields.size(), Context); 3791 ID->setLocEnd(RBrac); 3792 3793 // Must enforce the rule that ivars in the base classes may not be 3794 // duplicates. 3795 if (ID->getSuperClass()) { 3796 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 3797 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 3798 ObjCIvarDecl* Ivar = (*IVI); 3799 IdentifierInfo *II = Ivar->getIdentifier(); 3800 ObjCIvarDecl* prevIvar = 3801 ID->getSuperClass()->lookupInstanceVariable(II); 3802 if (prevIvar) { 3803 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 3804 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 3805 } 3806 } 3807 } 3808 } else if (ObjCImplementationDecl *IMPDecl = 3809 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 3810 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 3811 IMPDecl->setIVarList(ClsFields, RecFields.size(), Context); 3812 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 3813 } 3814 } 3815 3816 if (Attr) 3817 ProcessDeclAttributeList(Record, Attr); 3818} 3819 3820EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 3821 EnumConstantDecl *LastEnumConst, 3822 SourceLocation IdLoc, 3823 IdentifierInfo *Id, 3824 ExprArg val) { 3825 Expr *Val = (Expr *)val.get(); 3826 3827 llvm::APSInt EnumVal(32); 3828 QualType EltTy; 3829 if (Val && !Val->isTypeDependent()) { 3830 // Make sure to promote the operand type to int. 3831 UsualUnaryConversions(Val); 3832 if (Val != val.get()) { 3833 val.release(); 3834 val = Val; 3835 } 3836 3837 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 3838 SourceLocation ExpLoc; 3839 if (!Val->isValueDependent() && 3840 VerifyIntegerConstantExpression(Val, &EnumVal)) { 3841 Val = 0; 3842 } else { 3843 EltTy = Val->getType(); 3844 } 3845 } 3846 3847 if (!Val) { 3848 if (LastEnumConst) { 3849 // Assign the last value + 1. 3850 EnumVal = LastEnumConst->getInitVal(); 3851 ++EnumVal; 3852 3853 // Check for overflow on increment. 3854 if (EnumVal < LastEnumConst->getInitVal()) 3855 Diag(IdLoc, diag::warn_enum_value_overflow); 3856 3857 EltTy = LastEnumConst->getType(); 3858 } else { 3859 // First value, set to zero. 3860 EltTy = Context.IntTy; 3861 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 3862 } 3863 } 3864 3865 val.release(); 3866 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 3867 Val, EnumVal); 3868} 3869 3870 3871Sema::DeclTy *Sema::ActOnEnumConstant(Scope *S, DeclTy *theEnumDecl, 3872 DeclTy *lastEnumConst, 3873 SourceLocation IdLoc, IdentifierInfo *Id, 3874 SourceLocation EqualLoc, ExprTy *val) { 3875 EnumDecl *TheEnumDecl = cast<EnumDecl>(static_cast<Decl*>(theEnumDecl)); 3876 EnumConstantDecl *LastEnumConst = 3877 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(lastEnumConst)); 3878 Expr *Val = static_cast<Expr*>(val); 3879 3880 // The scope passed in may not be a decl scope. Zip up the scope tree until 3881 // we find one that is. 3882 S = getNonFieldDeclScope(S); 3883 3884 // Verify that there isn't already something declared with this name in this 3885 // scope. 3886 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 3887 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3888 // Maybe we will complain about the shadowed template parameter. 3889 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 3890 // Just pretend that we didn't see the previous declaration. 3891 PrevDecl = 0; 3892 } 3893 3894 if (PrevDecl) { 3895 // When in C++, we may get a TagDecl with the same name; in this case the 3896 // enum constant will 'hide' the tag. 3897 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 3898 "Received TagDecl when not in C++!"); 3899 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 3900 if (isa<EnumConstantDecl>(PrevDecl)) 3901 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 3902 else 3903 Diag(IdLoc, diag::err_redefinition) << Id; 3904 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3905 if (Val) Val->Destroy(Context); 3906 return 0; 3907 } 3908 } 3909 3910 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 3911 IdLoc, Id, Owned(Val)); 3912 3913 // Register this decl in the current scope stack. 3914 if (New) 3915 PushOnScopeChains(New, S); 3916 3917 return New; 3918} 3919 3920// FIXME: For consistency with ActOnFields(), we should have the parser 3921// pass in the source location for the left/right braces. 3922void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclTy *EnumDeclX, 3923 DeclTy **Elements, unsigned NumElements) { 3924 EnumDecl *Enum = cast<EnumDecl>(static_cast<Decl*>(EnumDeclX)); 3925 QualType EnumType = Context.getTypeDeclType(Enum); 3926 3927 // TODO: If the result value doesn't fit in an int, it must be a long or long 3928 // long value. ISO C does not support this, but GCC does as an extension, 3929 // emit a warning. 3930 unsigned IntWidth = Context.Target.getIntWidth(); 3931 3932 // Verify that all the values are okay, compute the size of the values, and 3933 // reverse the list. 3934 unsigned NumNegativeBits = 0; 3935 unsigned NumPositiveBits = 0; 3936 3937 // Keep track of whether all elements have type int. 3938 bool AllElementsInt = true; 3939 3940 for (unsigned i = 0; i != NumElements; ++i) { 3941 EnumConstantDecl *ECD = 3942 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3943 if (!ECD) continue; // Already issued a diagnostic. 3944 3945 // If the enum value doesn't fit in an int, emit an extension warning. 3946 const llvm::APSInt &InitVal = ECD->getInitVal(); 3947 assert(InitVal.getBitWidth() >= IntWidth && 3948 "Should have promoted value to int"); 3949 if (InitVal.getBitWidth() > IntWidth) { 3950 llvm::APSInt V(InitVal); 3951 V.trunc(IntWidth); 3952 V.extend(InitVal.getBitWidth()); 3953 if (V != InitVal) 3954 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 3955 << InitVal.toString(10); 3956 } 3957 3958 // Keep track of the size of positive and negative values. 3959 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 3960 NumPositiveBits = std::max(NumPositiveBits, 3961 (unsigned)InitVal.getActiveBits()); 3962 else 3963 NumNegativeBits = std::max(NumNegativeBits, 3964 (unsigned)InitVal.getMinSignedBits()); 3965 3966 // Keep track of whether every enum element has type int (very commmon). 3967 if (AllElementsInt) 3968 AllElementsInt = ECD->getType() == Context.IntTy; 3969 } 3970 3971 // Figure out the type that should be used for this enum. 3972 // FIXME: Support attribute(packed) on enums and -fshort-enums. 3973 QualType BestType; 3974 unsigned BestWidth; 3975 3976 if (NumNegativeBits) { 3977 // If there is a negative value, figure out the smallest integer type (of 3978 // int/long/longlong) that fits. 3979 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 3980 BestType = Context.IntTy; 3981 BestWidth = IntWidth; 3982 } else { 3983 BestWidth = Context.Target.getLongWidth(); 3984 3985 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 3986 BestType = Context.LongTy; 3987 else { 3988 BestWidth = Context.Target.getLongLongWidth(); 3989 3990 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 3991 Diag(Enum->getLocation(), diag::warn_enum_too_large); 3992 BestType = Context.LongLongTy; 3993 } 3994 } 3995 } else { 3996 // If there is no negative value, figure out which of uint, ulong, ulonglong 3997 // fits. 3998 if (NumPositiveBits <= IntWidth) { 3999 BestType = Context.UnsignedIntTy; 4000 BestWidth = IntWidth; 4001 } else if (NumPositiveBits <= 4002 (BestWidth = Context.Target.getLongWidth())) { 4003 BestType = Context.UnsignedLongTy; 4004 } else { 4005 BestWidth = Context.Target.getLongLongWidth(); 4006 assert(NumPositiveBits <= BestWidth && 4007 "How could an initializer get larger than ULL?"); 4008 BestType = Context.UnsignedLongLongTy; 4009 } 4010 } 4011 4012 // Loop over all of the enumerator constants, changing their types to match 4013 // the type of the enum if needed. 4014 for (unsigned i = 0; i != NumElements; ++i) { 4015 EnumConstantDecl *ECD = 4016 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 4017 if (!ECD) continue; // Already issued a diagnostic. 4018 4019 // Standard C says the enumerators have int type, but we allow, as an 4020 // extension, the enumerators to be larger than int size. If each 4021 // enumerator value fits in an int, type it as an int, otherwise type it the 4022 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 4023 // that X has type 'int', not 'unsigned'. 4024 if (ECD->getType() == Context.IntTy) { 4025 // Make sure the init value is signed. 4026 llvm::APSInt IV = ECD->getInitVal(); 4027 IV.setIsSigned(true); 4028 ECD->setInitVal(IV); 4029 4030 if (getLangOptions().CPlusPlus) 4031 // C++ [dcl.enum]p4: Following the closing brace of an 4032 // enum-specifier, each enumerator has the type of its 4033 // enumeration. 4034 ECD->setType(EnumType); 4035 continue; // Already int type. 4036 } 4037 4038 // Determine whether the value fits into an int. 4039 llvm::APSInt InitVal = ECD->getInitVal(); 4040 bool FitsInInt; 4041 if (InitVal.isUnsigned() || !InitVal.isNegative()) 4042 FitsInInt = InitVal.getActiveBits() < IntWidth; 4043 else 4044 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 4045 4046 // If it fits into an integer type, force it. Otherwise force it to match 4047 // the enum decl type. 4048 QualType NewTy; 4049 unsigned NewWidth; 4050 bool NewSign; 4051 if (FitsInInt) { 4052 NewTy = Context.IntTy; 4053 NewWidth = IntWidth; 4054 NewSign = true; 4055 } else if (ECD->getType() == BestType) { 4056 // Already the right type! 4057 if (getLangOptions().CPlusPlus) 4058 // C++ [dcl.enum]p4: Following the closing brace of an 4059 // enum-specifier, each enumerator has the type of its 4060 // enumeration. 4061 ECD->setType(EnumType); 4062 continue; 4063 } else { 4064 NewTy = BestType; 4065 NewWidth = BestWidth; 4066 NewSign = BestType->isSignedIntegerType(); 4067 } 4068 4069 // Adjust the APSInt value. 4070 InitVal.extOrTrunc(NewWidth); 4071 InitVal.setIsSigned(NewSign); 4072 ECD->setInitVal(InitVal); 4073 4074 // Adjust the Expr initializer and type. 4075 if (ECD->getInitExpr()) 4076 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), 4077 /*isLvalue=*/false)); 4078 if (getLangOptions().CPlusPlus) 4079 // C++ [dcl.enum]p4: Following the closing brace of an 4080 // enum-specifier, each enumerator has the type of its 4081 // enumeration. 4082 ECD->setType(EnumType); 4083 else 4084 ECD->setType(NewTy); 4085 } 4086 4087 Enum->completeDefinition(Context, BestType); 4088} 4089 4090Sema::DeclTy *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 4091 ExprArg expr) { 4092 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr.release()); 4093 4094 return FileScopeAsmDecl::Create(Context, CurContext, Loc, AsmString); 4095} 4096 4097