SemaDecl.cpp revision d874def0f9003cb8582e97452345b2a3a4a18b6d
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: Check if we have a non-static decl followed by a static. 836 if (New->getStorageClass() != VarDecl::Static && 837 Old->getStorageClass() == VarDecl::Static) { 838 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 839 Diag(Old->getLocation(), diag::note_previous_definition); 840 return true; 841 } 842 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 843 if (New->getStorageClass() != VarDecl::Extern && !New->isFileVarDecl() && 844 // Don't complain about out-of-line definitions of static members. 845 !(Old->getLexicalDeclContext()->isRecord() && 846 !New->getLexicalDeclContext()->isRecord())) { 847 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 848 Diag(Old->getLocation(), diag::note_previous_definition); 849 return true; 850 } 851 852 // Keep a chain of previous declarations. 853 New->setPreviousDeclaration(Old); 854 855 return false; 856} 857 858/// CheckParmsForFunctionDef - Check that the parameters of the given 859/// function are appropriate for the definition of a function. This 860/// takes care of any checks that cannot be performed on the 861/// declaration itself, e.g., that the types of each of the function 862/// parameters are complete. 863bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 864 bool HasInvalidParm = false; 865 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 866 ParmVarDecl *Param = FD->getParamDecl(p); 867 868 // C99 6.7.5.3p4: the parameters in a parameter type list in a 869 // function declarator that is part of a function definition of 870 // that function shall not have incomplete type. 871 if (!Param->isInvalidDecl() && 872 RequireCompleteType(Param->getLocation(), Param->getType(), 873 diag::err_typecheck_decl_incomplete_type)) { 874 Param->setInvalidDecl(); 875 HasInvalidParm = true; 876 } 877 878 // C99 6.9.1p5: If the declarator includes a parameter type list, the 879 // declaration of each parameter shall include an identifier. 880 if (Param->getIdentifier() == 0 && 881 !Param->isImplicit() && 882 !getLangOptions().CPlusPlus) 883 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 884 } 885 886 return HasInvalidParm; 887} 888 889/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 890/// no declarator (e.g. "struct foo;") is parsed. 891Sema::DeclTy *Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 892 TagDecl *Tag = 0; 893 if (DS.getTypeSpecType() == DeclSpec::TST_class || 894 DS.getTypeSpecType() == DeclSpec::TST_struct || 895 DS.getTypeSpecType() == DeclSpec::TST_union || 896 DS.getTypeSpecType() == DeclSpec::TST_enum) 897 Tag = dyn_cast<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 898 899 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 900 if (!Record->getDeclName() && Record->isDefinition() && 901 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 902 if (getLangOptions().CPlusPlus || 903 Record->getDeclContext()->isRecord()) 904 return BuildAnonymousStructOrUnion(S, DS, Record); 905 906 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 907 << DS.getSourceRange(); 908 } 909 910 // Microsoft allows unnamed struct/union fields. Don't complain 911 // about them. 912 // FIXME: Should we support Microsoft's extensions in this area? 913 if (Record->getDeclName() && getLangOptions().Microsoft) 914 return Tag; 915 } 916 917 if (!DS.isMissingDeclaratorOk() && 918 DS.getTypeSpecType() != DeclSpec::TST_error) { 919 // Warn about typedefs of enums without names, since this is an 920 // extension in both Microsoft an GNU. 921 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 922 Tag && isa<EnumDecl>(Tag)) { 923 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 924 << DS.getSourceRange(); 925 return Tag; 926 } 927 928 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 929 << DS.getSourceRange(); 930 return 0; 931 } 932 933 return Tag; 934} 935 936/// InjectAnonymousStructOrUnionMembers - Inject the members of the 937/// anonymous struct or union AnonRecord into the owning context Owner 938/// and scope S. This routine will be invoked just after we realize 939/// that an unnamed union or struct is actually an anonymous union or 940/// struct, e.g., 941/// 942/// @code 943/// union { 944/// int i; 945/// float f; 946/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 947/// // f into the surrounding scope.x 948/// @endcode 949/// 950/// This routine is recursive, injecting the names of nested anonymous 951/// structs/unions into the owning context and scope as well. 952bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 953 RecordDecl *AnonRecord) { 954 bool Invalid = false; 955 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 956 FEnd = AnonRecord->field_end(); 957 F != FEnd; ++F) { 958 if ((*F)->getDeclName()) { 959 NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 960 LookupOrdinaryName, true); 961 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 962 // C++ [class.union]p2: 963 // The names of the members of an anonymous union shall be 964 // distinct from the names of any other entity in the 965 // scope in which the anonymous union is declared. 966 unsigned diagKind 967 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 968 : diag::err_anonymous_struct_member_redecl; 969 Diag((*F)->getLocation(), diagKind) 970 << (*F)->getDeclName(); 971 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 972 Invalid = true; 973 } else { 974 // C++ [class.union]p2: 975 // For the purpose of name lookup, after the anonymous union 976 // definition, the members of the anonymous union are 977 // considered to have been defined in the scope in which the 978 // anonymous union is declared. 979 Owner->makeDeclVisibleInContext(*F); 980 S->AddDecl(*F); 981 IdResolver.AddDecl(*F); 982 } 983 } else if (const RecordType *InnerRecordType 984 = (*F)->getType()->getAsRecordType()) { 985 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 986 if (InnerRecord->isAnonymousStructOrUnion()) 987 Invalid = Invalid || 988 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 989 } 990 } 991 992 return Invalid; 993} 994 995/// ActOnAnonymousStructOrUnion - Handle the declaration of an 996/// anonymous structure or union. Anonymous unions are a C++ feature 997/// (C++ [class.union]) and a GNU C extension; anonymous structures 998/// are a GNU C and GNU C++ extension. 999Sema::DeclTy *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1000 RecordDecl *Record) { 1001 DeclContext *Owner = Record->getDeclContext(); 1002 1003 // Diagnose whether this anonymous struct/union is an extension. 1004 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1005 Diag(Record->getLocation(), diag::ext_anonymous_union); 1006 else if (!Record->isUnion()) 1007 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1008 1009 // C and C++ require different kinds of checks for anonymous 1010 // structs/unions. 1011 bool Invalid = false; 1012 if (getLangOptions().CPlusPlus) { 1013 const char* PrevSpec = 0; 1014 // C++ [class.union]p3: 1015 // Anonymous unions declared in a named namespace or in the 1016 // global namespace shall be declared static. 1017 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1018 (isa<TranslationUnitDecl>(Owner) || 1019 (isa<NamespaceDecl>(Owner) && 1020 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1021 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1022 Invalid = true; 1023 1024 // Recover by adding 'static'. 1025 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); 1026 } 1027 // C++ [class.union]p3: 1028 // A storage class is not allowed in a declaration of an 1029 // anonymous union in a class scope. 1030 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1031 isa<RecordDecl>(Owner)) { 1032 Diag(DS.getStorageClassSpecLoc(), 1033 diag::err_anonymous_union_with_storage_spec); 1034 Invalid = true; 1035 1036 // Recover by removing the storage specifier. 1037 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1038 PrevSpec); 1039 } 1040 1041 // C++ [class.union]p2: 1042 // The member-specification of an anonymous union shall only 1043 // define non-static data members. [Note: nested types and 1044 // functions cannot be declared within an anonymous union. ] 1045 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1046 MemEnd = Record->decls_end(); 1047 Mem != MemEnd; ++Mem) { 1048 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1049 // C++ [class.union]p3: 1050 // An anonymous union shall not have private or protected 1051 // members (clause 11). 1052 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1053 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1054 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1055 Invalid = true; 1056 } 1057 } else if ((*Mem)->isImplicit()) { 1058 // Any implicit members are fine. 1059 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1060 // This is a type that showed up in an 1061 // elaborated-type-specifier inside the anonymous struct or 1062 // union, but which actually declares a type outside of the 1063 // anonymous struct or union. It's okay. 1064 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1065 if (!MemRecord->isAnonymousStructOrUnion() && 1066 MemRecord->getDeclName()) { 1067 // This is a nested type declaration. 1068 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1069 << (int)Record->isUnion(); 1070 Invalid = true; 1071 } 1072 } else { 1073 // We have something that isn't a non-static data 1074 // member. Complain about it. 1075 unsigned DK = diag::err_anonymous_record_bad_member; 1076 if (isa<TypeDecl>(*Mem)) 1077 DK = diag::err_anonymous_record_with_type; 1078 else if (isa<FunctionDecl>(*Mem)) 1079 DK = diag::err_anonymous_record_with_function; 1080 else if (isa<VarDecl>(*Mem)) 1081 DK = diag::err_anonymous_record_with_static; 1082 Diag((*Mem)->getLocation(), DK) 1083 << (int)Record->isUnion(); 1084 Invalid = true; 1085 } 1086 } 1087 } 1088 1089 if (!Record->isUnion() && !Owner->isRecord()) { 1090 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1091 << (int)getLangOptions().CPlusPlus; 1092 Invalid = true; 1093 } 1094 1095 // Create a declaration for this anonymous struct/union. 1096 NamedDecl *Anon = 0; 1097 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1098 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1099 /*IdentifierInfo=*/0, 1100 Context.getTypeDeclType(Record), 1101 /*BitWidth=*/0, /*Mutable=*/false); 1102 Anon->setAccess(AS_public); 1103 if (getLangOptions().CPlusPlus) 1104 FieldCollector->Add(cast<FieldDecl>(Anon)); 1105 } else { 1106 VarDecl::StorageClass SC; 1107 switch (DS.getStorageClassSpec()) { 1108 default: assert(0 && "Unknown storage class!"); 1109 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1110 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1111 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1112 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1113 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1114 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1115 case DeclSpec::SCS_mutable: 1116 // mutable can only appear on non-static class members, so it's always 1117 // an error here 1118 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1119 Invalid = true; 1120 SC = VarDecl::None; 1121 break; 1122 } 1123 1124 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1125 /*IdentifierInfo=*/0, 1126 Context.getTypeDeclType(Record), 1127 SC, DS.getSourceRange().getBegin()); 1128 } 1129 Anon->setImplicit(); 1130 1131 // Add the anonymous struct/union object to the current 1132 // context. We'll be referencing this object when we refer to one of 1133 // its members. 1134 Owner->addDecl(Anon); 1135 1136 // Inject the members of the anonymous struct/union into the owning 1137 // context and into the identifier resolver chain for name lookup 1138 // purposes. 1139 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1140 Invalid = true; 1141 1142 // Mark this as an anonymous struct/union type. Note that we do not 1143 // do this until after we have already checked and injected the 1144 // members of this anonymous struct/union type, because otherwise 1145 // the members could be injected twice: once by DeclContext when it 1146 // builds its lookup table, and once by 1147 // InjectAnonymousStructOrUnionMembers. 1148 Record->setAnonymousStructOrUnion(true); 1149 1150 if (Invalid) 1151 Anon->setInvalidDecl(); 1152 1153 return Anon; 1154} 1155 1156 1157/// GetNameForDeclarator - Determine the full declaration name for the 1158/// given Declarator. 1159DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1160 switch (D.getKind()) { 1161 case Declarator::DK_Abstract: 1162 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 1163 return DeclarationName(); 1164 1165 case Declarator::DK_Normal: 1166 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 1167 return DeclarationName(D.getIdentifier()); 1168 1169 case Declarator::DK_Constructor: { 1170 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1171 Ty = Context.getCanonicalType(Ty); 1172 return Context.DeclarationNames.getCXXConstructorName(Ty); 1173 } 1174 1175 case Declarator::DK_Destructor: { 1176 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1177 Ty = Context.getCanonicalType(Ty); 1178 return Context.DeclarationNames.getCXXDestructorName(Ty); 1179 } 1180 1181 case Declarator::DK_Conversion: { 1182 // FIXME: We'd like to keep the non-canonical type for diagnostics! 1183 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1184 Ty = Context.getCanonicalType(Ty); 1185 return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 1186 } 1187 1188 case Declarator::DK_Operator: 1189 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 1190 return Context.DeclarationNames.getCXXOperatorName( 1191 D.getOverloadedOperator()); 1192 } 1193 1194 assert(false && "Unknown name kind"); 1195 return DeclarationName(); 1196} 1197 1198/// isNearlyMatchingFunction - Determine whether the C++ functions 1199/// Declaration and Definition are "nearly" matching. This heuristic 1200/// is used to improve diagnostics in the case where an out-of-line 1201/// function definition doesn't match any declaration within 1202/// the class or namespace. 1203static bool isNearlyMatchingFunction(ASTContext &Context, 1204 FunctionDecl *Declaration, 1205 FunctionDecl *Definition) { 1206 if (Declaration->param_size() != Definition->param_size()) 1207 return false; 1208 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1209 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1210 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1211 1212 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1213 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 1214 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1215 return false; 1216 } 1217 1218 return true; 1219} 1220 1221Sema::DeclTy * 1222Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl, 1223 bool IsFunctionDefinition) { 1224 NamedDecl *LastDeclarator = dyn_cast_or_null<NamedDecl>((Decl *)lastDecl); 1225 DeclarationName Name = GetNameForDeclarator(D); 1226 1227 // All of these full declarators require an identifier. If it doesn't have 1228 // one, the ParsedFreeStandingDeclSpec action should be used. 1229 if (!Name) { 1230 if (!D.getInvalidType()) // Reject this if we think it is valid. 1231 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1232 diag::err_declarator_need_ident) 1233 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1234 return 0; 1235 } 1236 1237 // The scope passed in may not be a decl scope. Zip up the scope tree until 1238 // we find one that is. 1239 while ((S->getFlags() & Scope::DeclScope) == 0 || 1240 (S->getFlags() & Scope::TemplateParamScope) != 0) 1241 S = S->getParent(); 1242 1243 DeclContext *DC; 1244 NamedDecl *PrevDecl; 1245 NamedDecl *New; 1246 bool InvalidDecl = false; 1247 1248 QualType R = GetTypeForDeclarator(D, S); 1249 if (R.isNull()) { 1250 InvalidDecl = true; 1251 R = Context.IntTy; 1252 } 1253 1254 // See if this is a redefinition of a variable in the same scope. 1255 if (D.getCXXScopeSpec().isInvalid()) { 1256 DC = CurContext; 1257 PrevDecl = 0; 1258 InvalidDecl = true; 1259 } else if (!D.getCXXScopeSpec().isSet()) { 1260 LookupNameKind NameKind = LookupOrdinaryName; 1261 1262 // If the declaration we're planning to build will be a function 1263 // or object with linkage, then look for another declaration with 1264 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1265 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1266 /* Do nothing*/; 1267 else if (R->isFunctionType()) { 1268 if (CurContext->isFunctionOrMethod()) 1269 NameKind = LookupRedeclarationWithLinkage; 1270 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1271 NameKind = LookupRedeclarationWithLinkage; 1272 1273 DC = CurContext; 1274 PrevDecl = LookupName(S, Name, NameKind, true, 1275 D.getDeclSpec().getStorageClassSpec() != 1276 DeclSpec::SCS_static, 1277 D.getIdentifierLoc()); 1278 } else { // Something like "int foo::x;" 1279 DC = computeDeclContext(D.getCXXScopeSpec()); 1280 // FIXME: RequireCompleteDeclContext(D.getCXXScopeSpec()); ? 1281 PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName, true); 1282 1283 // C++ 7.3.1.2p2: 1284 // Members (including explicit specializations of templates) of a named 1285 // namespace can also be defined outside that namespace by explicit 1286 // qualification of the name being defined, provided that the entity being 1287 // defined was already declared in the namespace and the definition appears 1288 // after the point of declaration in a namespace that encloses the 1289 // declarations namespace. 1290 // 1291 // Note that we only check the context at this point. We don't yet 1292 // have enough information to make sure that PrevDecl is actually 1293 // the declaration we want to match. For example, given: 1294 // 1295 // class X { 1296 // void f(); 1297 // void f(float); 1298 // }; 1299 // 1300 // void X::f(int) { } // ill-formed 1301 // 1302 // In this case, PrevDecl will point to the overload set 1303 // containing the two f's declared in X, but neither of them 1304 // matches. 1305 1306 // First check whether we named the global scope. 1307 if (isa<TranslationUnitDecl>(DC)) { 1308 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1309 << Name << D.getCXXScopeSpec().getRange(); 1310 } else if (!CurContext->Encloses(DC)) { 1311 // The qualifying scope doesn't enclose the original declaration. 1312 // Emit diagnostic based on current scope. 1313 SourceLocation L = D.getIdentifierLoc(); 1314 SourceRange R = D.getCXXScopeSpec().getRange(); 1315 if (isa<FunctionDecl>(CurContext)) 1316 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1317 else 1318 Diag(L, diag::err_invalid_declarator_scope) 1319 << Name << cast<NamedDecl>(DC) << R; 1320 InvalidDecl = true; 1321 } 1322 } 1323 1324 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1325 // Maybe we will complain about the shadowed template parameter. 1326 InvalidDecl = InvalidDecl 1327 || DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 1328 // Just pretend that we didn't see the previous declaration. 1329 PrevDecl = 0; 1330 } 1331 1332 // In C++, the previous declaration we find might be a tag type 1333 // (class or enum). In this case, the new declaration will hide the 1334 // tag type. Note that this does does not apply if we're declaring a 1335 // typedef (C++ [dcl.typedef]p4). 1336 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 1337 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1338 PrevDecl = 0; 1339 1340 bool Redeclaration = false; 1341 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1342 New = ActOnTypedefDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1343 InvalidDecl, Redeclaration); 1344 } else if (R->isFunctionType()) { 1345 New = ActOnFunctionDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1346 IsFunctionDefinition, InvalidDecl, 1347 Redeclaration); 1348 } else { 1349 New = ActOnVariableDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1350 InvalidDecl, Redeclaration); 1351 } 1352 1353 if (New == 0) 1354 return 0; 1355 1356 // If this has an identifier and is not an invalid redeclaration, 1357 // add it to the scope stack. 1358 if (Name && !(Redeclaration && InvalidDecl)) 1359 PushOnScopeChains(New, S); 1360 // If any semantic error occurred, mark the decl as invalid. 1361 if (D.getInvalidType() || InvalidDecl) 1362 New->setInvalidDecl(); 1363 1364 return New; 1365} 1366 1367/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 1368/// types into constant array types in certain situations which would otherwise 1369/// be errors (for GCC compatibility). 1370static QualType TryToFixInvalidVariablyModifiedType(QualType T, 1371 ASTContext &Context, 1372 bool &SizeIsNegative) { 1373 // This method tries to turn a variable array into a constant 1374 // array even when the size isn't an ICE. This is necessary 1375 // for compatibility with code that depends on gcc's buggy 1376 // constant expression folding, like struct {char x[(int)(char*)2];} 1377 SizeIsNegative = false; 1378 1379 if (const PointerType* PTy = dyn_cast<PointerType>(T)) { 1380 QualType Pointee = PTy->getPointeeType(); 1381 QualType FixedType = 1382 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 1383 if (FixedType.isNull()) return FixedType; 1384 FixedType = Context.getPointerType(FixedType); 1385 FixedType.setCVRQualifiers(T.getCVRQualifiers()); 1386 return FixedType; 1387 } 1388 1389 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 1390 if (!VLATy) 1391 return QualType(); 1392 // FIXME: We should probably handle this case 1393 if (VLATy->getElementType()->isVariablyModifiedType()) 1394 return QualType(); 1395 1396 Expr::EvalResult EvalResult; 1397 if (!VLATy->getSizeExpr() || 1398 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 1399 !EvalResult.Val.isInt()) 1400 return QualType(); 1401 1402 llvm::APSInt &Res = EvalResult.Val.getInt(); 1403 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) 1404 return Context.getConstantArrayType(VLATy->getElementType(), 1405 Res, ArrayType::Normal, 0); 1406 1407 SizeIsNegative = true; 1408 return QualType(); 1409} 1410 1411/// \brief Register the given locally-scoped external C declaration so 1412/// that it can be found later for redeclarations 1413void 1414Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, NamedDecl *PrevDecl, 1415 Scope *S) { 1416 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 1417 "Decl is not a locally-scoped decl!"); 1418 // Note that we have a locally-scoped external with this name. 1419 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 1420 1421 if (!PrevDecl) 1422 return; 1423 1424 // If there was a previous declaration of this variable, it may be 1425 // in our identifier chain. Update the identifier chain with the new 1426 // declaration. 1427 if (IdResolver.ReplaceDecl(PrevDecl, ND)) { 1428 // The previous declaration was found on the identifer resolver 1429 // chain, so remove it from its scope. 1430 while (S && !S->isDeclScope(PrevDecl)) 1431 S = S->getParent(); 1432 1433 if (S) 1434 S->RemoveDecl(PrevDecl); 1435 } 1436} 1437 1438NamedDecl* 1439Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1440 QualType R, Decl* LastDeclarator, 1441 Decl* PrevDecl, bool& InvalidDecl, 1442 bool &Redeclaration) { 1443 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1444 if (D.getCXXScopeSpec().isSet()) { 1445 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1446 << D.getCXXScopeSpec().getRange(); 1447 InvalidDecl = true; 1448 // Pretend we didn't see the scope specifier. 1449 DC = 0; 1450 } 1451 1452 if (getLangOptions().CPlusPlus) { 1453 // Check that there are no default arguments (C++ only). 1454 CheckExtraCXXDefaultArguments(D); 1455 1456 if (D.getDeclSpec().isVirtualSpecified()) 1457 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1458 diag::err_virtual_non_function); 1459 } 1460 1461 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, LastDeclarator); 1462 if (!NewTD) return 0; 1463 1464 // Handle attributes prior to checking for duplicates in MergeVarDecl 1465 ProcessDeclAttributes(NewTD, D); 1466 // Merge the decl with the existing one if appropriate. If the decl is 1467 // in an outer scope, it isn't the same thing. 1468 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1469 Redeclaration = true; 1470 if (MergeTypeDefDecl(NewTD, PrevDecl)) 1471 InvalidDecl = true; 1472 } 1473 1474 if (S->getFnParent() == 0) { 1475 QualType T = NewTD->getUnderlyingType(); 1476 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1477 // then it shall have block scope. 1478 if (T->isVariablyModifiedType()) { 1479 bool SizeIsNegative; 1480 QualType FixedTy = 1481 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1482 if (!FixedTy.isNull()) { 1483 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 1484 NewTD->setUnderlyingType(FixedTy); 1485 } else { 1486 if (SizeIsNegative) 1487 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 1488 else if (T->isVariableArrayType()) 1489 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1490 else 1491 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1492 InvalidDecl = true; 1493 } 1494 } 1495 } 1496 return NewTD; 1497} 1498 1499/// \brief Determines whether the given declaration is an out-of-scope 1500/// previous declaration. 1501/// 1502/// This routine should be invoked when name lookup has found a 1503/// previous declaration (PrevDecl) that is not in the scope where a 1504/// new declaration by the same name is being introduced. If the new 1505/// declaration occurs in a local scope, previous declarations with 1506/// linkage may still be considered previous declarations (C99 1507/// 6.2.2p4-5, C++ [basic.link]p6). 1508/// 1509/// \param PrevDecl the previous declaration found by name 1510/// lookup 1511/// 1512/// \param DC the context in which the new declaration is being 1513/// declared. 1514/// 1515/// \returns true if PrevDecl is an out-of-scope previous declaration 1516/// for a new delcaration with the same name. 1517static bool 1518isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 1519 ASTContext &Context) { 1520 if (!PrevDecl) 1521 return 0; 1522 1523 // FIXME: PrevDecl could be an OverloadedFunctionDecl, in which 1524 // case we need to check each of the overloaded functions. 1525 if (!PrevDecl->hasLinkage()) 1526 return false; 1527 1528 if (Context.getLangOptions().CPlusPlus) { 1529 // C++ [basic.link]p6: 1530 // If there is a visible declaration of an entity with linkage 1531 // having the same name and type, ignoring entities declared 1532 // outside the innermost enclosing namespace scope, the block 1533 // scope declaration declares that same entity and receives the 1534 // linkage of the previous declaration. 1535 DeclContext *OuterContext = DC->getLookupContext(); 1536 if (!OuterContext->isFunctionOrMethod()) 1537 // This rule only applies to block-scope declarations. 1538 return false; 1539 else { 1540 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 1541 if (PrevOuterContext->isRecord()) 1542 // We found a member function: ignore it. 1543 return false; 1544 else { 1545 // Find the innermost enclosing namespace for the new and 1546 // previous declarations. 1547 while (!OuterContext->isFileContext()) 1548 OuterContext = OuterContext->getParent(); 1549 while (!PrevOuterContext->isFileContext()) 1550 PrevOuterContext = PrevOuterContext->getParent(); 1551 1552 // The previous declaration is in a different namespace, so it 1553 // isn't the same function. 1554 if (OuterContext->getPrimaryContext() != 1555 PrevOuterContext->getPrimaryContext()) 1556 return false; 1557 } 1558 } 1559 } 1560 1561 return true; 1562} 1563 1564NamedDecl* 1565Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1566 QualType R, Decl* LastDeclarator, 1567 NamedDecl* PrevDecl, bool& InvalidDecl, 1568 bool &Redeclaration) { 1569 DeclarationName Name = GetNameForDeclarator(D); 1570 1571 // Check that there are no default arguments (C++ only). 1572 if (getLangOptions().CPlusPlus) 1573 CheckExtraCXXDefaultArguments(D); 1574 1575 if (R.getTypePtr()->isObjCInterfaceType()) { 1576 Diag(D.getIdentifierLoc(), diag::err_statically_allocated_object); 1577 InvalidDecl = true; 1578 } 1579 1580 VarDecl *NewVD; 1581 VarDecl::StorageClass SC; 1582 switch (D.getDeclSpec().getStorageClassSpec()) { 1583 default: assert(0 && "Unknown storage class!"); 1584 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1585 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1586 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1587 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1588 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1589 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1590 case DeclSpec::SCS_mutable: 1591 // mutable can only appear on non-static class members, so it's always 1592 // an error here 1593 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1594 InvalidDecl = true; 1595 SC = VarDecl::None; 1596 break; 1597 } 1598 1599 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1600 if (!II) { 1601 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1602 << Name.getAsString(); 1603 return 0; 1604 } 1605 1606 if (D.getDeclSpec().isVirtualSpecified()) 1607 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1608 diag::err_virtual_non_function); 1609 1610 bool ThreadSpecified = D.getDeclSpec().isThreadSpecified(); 1611 if (!DC->isRecord() && S->getFnParent() == 0) { 1612 // C99 6.9p2: The storage-class specifiers auto and register shall not 1613 // appear in the declaration specifiers in an external declaration. 1614 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 1615 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 1616 InvalidDecl = true; 1617 } 1618 } 1619 if (DC->isRecord() && !CurContext->isRecord()) { 1620 // This is an out-of-line definition of a static data member. 1621 if (SC == VarDecl::Static) { 1622 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1623 diag::err_static_out_of_line) 1624 << CodeModificationHint::CreateRemoval( 1625 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 1626 } else if (SC == VarDecl::None) 1627 SC = VarDecl::Static; 1628 } 1629 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1630 II, R, SC, 1631 // FIXME: Move to DeclGroup... 1632 D.getDeclSpec().getSourceRange().getBegin()); 1633 NewVD->setThreadSpecified(ThreadSpecified); 1634 NewVD->setNextDeclarator(LastDeclarator); 1635 1636 // Set the lexical context. If the declarator has a C++ scope specifier, the 1637 // lexical context will be different from the semantic context. 1638 NewVD->setLexicalDeclContext(CurContext); 1639 1640 // Handle attributes prior to checking for duplicates in MergeVarDecl 1641 ProcessDeclAttributes(NewVD, D); 1642 1643 // Handle GNU asm-label extension (encoded as an attribute). 1644 if (Expr *E = (Expr*) D.getAsmLabel()) { 1645 // The parser guarantees this is a string. 1646 StringLiteral *SE = cast<StringLiteral>(E); 1647 NewVD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 1648 SE->getByteLength()))); 1649 } 1650 1651 // Emit an error if an address space was applied to decl with local storage. 1652 // This includes arrays of objects with address space qualifiers, but not 1653 // automatic variables that point to other address spaces. 1654 // ISO/IEC TR 18037 S5.1.2 1655 if (NewVD->hasLocalStorage() && (NewVD->getType().getAddressSpace() != 0)) { 1656 Diag(D.getIdentifierLoc(), diag::err_as_qualified_auto_decl); 1657 InvalidDecl = true; 1658 } 1659 1660 if (NewVD->hasLocalStorage() && NewVD->getType().isObjCGCWeak()) { 1661 Diag(D.getIdentifierLoc(), diag::warn_attribute_weak_on_local); 1662 } 1663 1664 bool isIllegalVLA = R->isVariableArrayType() && NewVD->hasGlobalStorage(); 1665 bool isIllegalVM = R->isVariablyModifiedType() && NewVD->hasLinkage(); 1666 if (isIllegalVLA || isIllegalVM) { 1667 bool SizeIsNegative; 1668 QualType FixedTy = 1669 TryToFixInvalidVariablyModifiedType(R, Context, SizeIsNegative); 1670 if (!FixedTy.isNull()) { 1671 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 1672 NewVD->setType(FixedTy); 1673 } else if (R->isVariableArrayType()) { 1674 NewVD->setInvalidDecl(); 1675 1676 const VariableArrayType *VAT = Context.getAsVariableArrayType(R); 1677 // FIXME: This won't give the correct result for 1678 // int a[10][n]; 1679 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 1680 1681 if (NewVD->isFileVarDecl()) 1682 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 1683 << SizeRange; 1684 else if (NewVD->getStorageClass() == VarDecl::Static) 1685 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 1686 << SizeRange; 1687 else 1688 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 1689 << SizeRange; 1690 } else { 1691 InvalidDecl = true; 1692 1693 if (NewVD->isFileVarDecl()) 1694 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 1695 else 1696 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 1697 } 1698 } 1699 1700 // If name lookup finds a previous declaration that is not in the 1701 // same scope as the new declaration, this may still be an 1702 // acceptable redeclaration. 1703 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 1704 !(NewVD->hasLinkage() && 1705 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 1706 PrevDecl = 0; 1707 1708 if (!PrevDecl && NewVD->isExternC(Context)) { 1709 // Since we did not find anything by this name and we're declaring 1710 // an extern "C" variable, look for a non-visible extern "C" 1711 // declaration with the same name. 1712 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 1713 = LocallyScopedExternalDecls.find(Name); 1714 if (Pos != LocallyScopedExternalDecls.end()) 1715 PrevDecl = Pos->second; 1716 } 1717 1718 // Merge the decl with the existing one if appropriate. 1719 if (PrevDecl) { 1720 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 1721 // The user tried to define a non-static data member 1722 // out-of-line (C++ [dcl.meaning]p1). 1723 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 1724 << D.getCXXScopeSpec().getRange(); 1725 NewVD->Destroy(Context); 1726 return 0; 1727 } 1728 1729 Redeclaration = true; 1730 if (MergeVarDecl(NewVD, PrevDecl)) 1731 InvalidDecl = true; 1732 } else if (D.getCXXScopeSpec().isSet()) { 1733 // No previous declaration in the qualifying scope. 1734 Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 1735 << Name << D.getCXXScopeSpec().getRange(); 1736 InvalidDecl = true; 1737 } 1738 1739 if (!InvalidDecl && R->isVoidType() && !NewVD->hasExternalStorage()) { 1740 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 1741 << R; 1742 InvalidDecl = true; 1743 } 1744 1745 1746 // If this is a locally-scoped extern C variable, update the map of 1747 // such variables. 1748 if (CurContext->isFunctionOrMethod() && NewVD->isExternC(Context) && 1749 !InvalidDecl) 1750 RegisterLocallyScopedExternCDecl(NewVD, PrevDecl, S); 1751 1752 return NewVD; 1753} 1754 1755NamedDecl* 1756Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1757 QualType R, Decl *LastDeclarator, 1758 NamedDecl* PrevDecl, bool IsFunctionDefinition, 1759 bool& InvalidDecl, bool &Redeclaration) { 1760 assert(R.getTypePtr()->isFunctionType()); 1761 1762 DeclarationName Name = GetNameForDeclarator(D); 1763 FunctionDecl::StorageClass SC = FunctionDecl::None; 1764 switch (D.getDeclSpec().getStorageClassSpec()) { 1765 default: assert(0 && "Unknown storage class!"); 1766 case DeclSpec::SCS_auto: 1767 case DeclSpec::SCS_register: 1768 case DeclSpec::SCS_mutable: 1769 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1770 diag::err_typecheck_sclass_func); 1771 InvalidDecl = true; 1772 break; 1773 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 1774 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 1775 case DeclSpec::SCS_static: { 1776 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 1777 // C99 6.7.1p5: 1778 // The declaration of an identifier for a function that has 1779 // block scope shall have no explicit storage-class specifier 1780 // other than extern 1781 // See also (C++ [dcl.stc]p4). 1782 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1783 diag::err_static_block_func); 1784 SC = FunctionDecl::None; 1785 } else 1786 SC = FunctionDecl::Static; 1787 break; 1788 } 1789 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 1790 } 1791 1792 bool isInline = D.getDeclSpec().isInlineSpecified(); 1793 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1794 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 1795 1796 bool isVirtualOkay = false; 1797 FunctionDecl *NewFD; 1798 if (D.getKind() == Declarator::DK_Constructor) { 1799 // This is a C++ constructor declaration. 1800 assert(DC->isRecord() && 1801 "Constructors can only be declared in a member context"); 1802 1803 InvalidDecl = InvalidDecl || CheckConstructorDeclarator(D, R, SC); 1804 1805 // Create the new declaration 1806 NewFD = CXXConstructorDecl::Create(Context, 1807 cast<CXXRecordDecl>(DC), 1808 D.getIdentifierLoc(), Name, R, 1809 isExplicit, isInline, 1810 /*isImplicitlyDeclared=*/false); 1811 1812 if (InvalidDecl) 1813 NewFD->setInvalidDecl(); 1814 } else if (D.getKind() == Declarator::DK_Destructor) { 1815 // This is a C++ destructor declaration. 1816 if (DC->isRecord()) { 1817 InvalidDecl = InvalidDecl || CheckDestructorDeclarator(D, R, SC); 1818 1819 NewFD = CXXDestructorDecl::Create(Context, 1820 cast<CXXRecordDecl>(DC), 1821 D.getIdentifierLoc(), Name, R, 1822 isInline, 1823 /*isImplicitlyDeclared=*/false); 1824 1825 if (InvalidDecl) 1826 NewFD->setInvalidDecl(); 1827 1828 isVirtualOkay = true; 1829 } else { 1830 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 1831 1832 // Create a FunctionDecl to satisfy the function definition parsing 1833 // code path. 1834 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 1835 Name, R, SC, isInline, 1836 /*hasPrototype=*/true, 1837 // FIXME: Move to DeclGroup... 1838 D.getDeclSpec().getSourceRange().getBegin()); 1839 InvalidDecl = true; 1840 NewFD->setInvalidDecl(); 1841 } 1842 } else if (D.getKind() == Declarator::DK_Conversion) { 1843 if (!DC->isRecord()) { 1844 Diag(D.getIdentifierLoc(), 1845 diag::err_conv_function_not_member); 1846 return 0; 1847 } else { 1848 InvalidDecl = InvalidDecl || CheckConversionDeclarator(D, R, SC); 1849 1850 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 1851 D.getIdentifierLoc(), Name, R, 1852 isInline, isExplicit); 1853 1854 if (InvalidDecl) 1855 NewFD->setInvalidDecl(); 1856 1857 isVirtualOkay = true; 1858 } 1859 } else if (DC->isRecord()) { 1860 // This is a C++ method declaration. 1861 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 1862 D.getIdentifierLoc(), Name, R, 1863 (SC == FunctionDecl::Static), isInline); 1864 1865 isVirtualOkay = (SC != FunctionDecl::Static); 1866 } else { 1867 // Determine whether the function was written with a 1868 // prototype. This true when: 1869 // - we're in C++ (where every function has a prototype), 1870 // - there is a prototype in the declarator, or 1871 // - the type R of the function is some kind of typedef or other reference 1872 // to a type name (which eventually refers to a function type). 1873 bool HasPrototype = 1874 getLangOptions().CPlusPlus || 1875 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 1876 !isa<FunctionType>(R.getTypePtr()); 1877 1878 NewFD = FunctionDecl::Create(Context, DC, 1879 D.getIdentifierLoc(), 1880 Name, R, SC, isInline, HasPrototype, 1881 // FIXME: Move to DeclGroup... 1882 D.getDeclSpec().getSourceRange().getBegin()); 1883 } 1884 NewFD->setNextDeclarator(LastDeclarator); 1885 1886 // Set the lexical context. If the declarator has a C++ 1887 // scope specifier, the lexical context will be different 1888 // from the semantic context. 1889 NewFD->setLexicalDeclContext(CurContext); 1890 1891 // C++ [dcl.fct.spec]p5: 1892 // The virtual specifier shall only be used in declarations of 1893 // nonstatic class member functions that appear within a 1894 // member-specification of a class declaration; see 10.3. 1895 // 1896 // FIXME: Checking the 'virtual' specifier is not sufficient. A 1897 // function is also virtual if it overrides an already virtual 1898 // function. This is important to do here because it's part of the 1899 // declaration. 1900 if (isVirtual && !InvalidDecl) { 1901 if (!isVirtualOkay) { 1902 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1903 diag::err_virtual_non_function); 1904 } else if (!CurContext->isRecord()) { 1905 // 'virtual' was specified outside of the class. 1906 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 1907 << CodeModificationHint::CreateRemoval( 1908 SourceRange(D.getDeclSpec().getVirtualSpecLoc())); 1909 } else { 1910 // Okay: Add virtual to the method. 1911 cast<CXXMethodDecl>(NewFD)->setVirtual(); 1912 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 1913 CurClass->setAggregate(false); 1914 CurClass->setPOD(false); 1915 CurClass->setPolymorphic(true); 1916 } 1917 } 1918 1919 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 1920 !CurContext->isRecord()) { 1921 // C++ [class.static]p1: 1922 // A data or function member of a class may be declared static 1923 // in a class definition, in which case it is a static member of 1924 // the class. 1925 1926 // Complain about the 'static' specifier if it's on an out-of-line 1927 // member function definition. 1928 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1929 diag::err_static_out_of_line) 1930 << CodeModificationHint::CreateRemoval( 1931 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 1932 } 1933 1934 // Handle GNU asm-label extension (encoded as an attribute). 1935 if (Expr *E = (Expr*) D.getAsmLabel()) { 1936 // The parser guarantees this is a string. 1937 StringLiteral *SE = cast<StringLiteral>(E); 1938 NewFD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 1939 SE->getByteLength()))); 1940 } 1941 1942 // Copy the parameter declarations from the declarator D to 1943 // the function declaration NewFD, if they are available. 1944 if (D.getNumTypeObjects() > 0) { 1945 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1946 1947 // Create Decl objects for each parameter, adding them to the 1948 // FunctionDecl. 1949 llvm::SmallVector<ParmVarDecl*, 16> Params; 1950 1951 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 1952 // function that takes no arguments, not a function that takes a 1953 // single void argument. 1954 // We let through "const void" here because Sema::GetTypeForDeclarator 1955 // already checks for that case. 1956 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1957 FTI.ArgInfo[0].Param && 1958 ((ParmVarDecl*)FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 1959 // empty arg list, don't push any params. 1960 ParmVarDecl *Param = (ParmVarDecl*)FTI.ArgInfo[0].Param; 1961 1962 // In C++, the empty parameter-type-list must be spelled "void"; a 1963 // typedef of void is not permitted. 1964 if (getLangOptions().CPlusPlus && 1965 Param->getType().getUnqualifiedType() != Context.VoidTy) { 1966 Diag(Param->getLocation(), diag::ext_param_typedef_of_void); 1967 } 1968 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 1969 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 1970 Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 1971 } 1972 1973 NewFD->setParams(Context, &Params[0], Params.size()); 1974 } else if (R->getAsTypedefType()) { 1975 // When we're declaring a function with a typedef, as in the 1976 // following example, we'll need to synthesize (unnamed) 1977 // parameters for use in the declaration. 1978 // 1979 // @code 1980 // typedef void fn(int); 1981 // fn f; 1982 // @endcode 1983 const FunctionProtoType *FT = R->getAsFunctionProtoType(); 1984 if (!FT) { 1985 // This is a typedef of a function with no prototype, so we 1986 // don't need to do anything. 1987 } else if ((FT->getNumArgs() == 0) || 1988 (FT->getNumArgs() == 1 && !FT->isVariadic() && 1989 FT->getArgType(0)->isVoidType())) { 1990 // This is a zero-argument function. We don't need to do anything. 1991 } else { 1992 // Synthesize a parameter for each argument type. 1993 llvm::SmallVector<ParmVarDecl*, 16> Params; 1994 for (FunctionProtoType::arg_type_iterator ArgType = FT->arg_type_begin(); 1995 ArgType != FT->arg_type_end(); ++ArgType) { 1996 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, 1997 SourceLocation(), 0, 1998 *ArgType, VarDecl::None, 1999 0); 2000 Param->setImplicit(); 2001 Params.push_back(Param); 2002 } 2003 2004 NewFD->setParams(Context, &Params[0], Params.size()); 2005 } 2006 } 2007 2008 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) 2009 InvalidDecl = InvalidDecl || CheckConstructor(Constructor); 2010 else if (isa<CXXDestructorDecl>(NewFD)) { 2011 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 2012 Record->setUserDeclaredDestructor(true); 2013 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 2014 // user-defined destructor. 2015 Record->setPOD(false); 2016 } else if (CXXConversionDecl *Conversion = 2017 dyn_cast<CXXConversionDecl>(NewFD)) 2018 ActOnConversionDeclarator(Conversion); 2019 2020 // Extra checking for C++ overloaded operators (C++ [over.oper]). 2021 if (NewFD->isOverloadedOperator() && 2022 CheckOverloadedOperatorDeclaration(NewFD)) 2023 NewFD->setInvalidDecl(); 2024 2025 // If name lookup finds a previous declaration that is not in the 2026 // same scope as the new declaration, this may still be an 2027 // acceptable redeclaration. 2028 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 2029 !(NewFD->hasLinkage() && 2030 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 2031 PrevDecl = 0; 2032 2033 if (!PrevDecl && NewFD->isExternC(Context)) { 2034 // Since we did not find anything by this name and we're declaring 2035 // an extern "C" function, look for a non-visible extern "C" 2036 // declaration with the same name. 2037 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2038 = LocallyScopedExternalDecls.find(Name); 2039 if (Pos != LocallyScopedExternalDecls.end()) 2040 PrevDecl = Pos->second; 2041 } 2042 2043 // Merge or overload the declaration with an existing declaration of 2044 // the same name, if appropriate. 2045 bool OverloadableAttrRequired = false; 2046 if (PrevDecl) { 2047 // Determine whether NewFD is an overload of PrevDecl or 2048 // a declaration that requires merging. If it's an overload, 2049 // there's no more work to do here; we'll just add the new 2050 // function to the scope. 2051 OverloadedFunctionDecl::function_iterator MatchedDecl; 2052 2053 if (!getLangOptions().CPlusPlus && 2054 AllowOverloadingOfFunction(PrevDecl, Context)) { 2055 OverloadableAttrRequired = true; 2056 2057 // Functions marked "overloadable" must have a prototype (that 2058 // we can't get through declaration merging). 2059 if (!R->getAsFunctionProtoType()) { 2060 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_no_prototype) 2061 << NewFD; 2062 InvalidDecl = true; 2063 Redeclaration = true; 2064 2065 // Turn this into a variadic function with no parameters. 2066 R = Context.getFunctionType(R->getAsFunctionType()->getResultType(), 2067 0, 0, true, 0); 2068 NewFD->setType(R); 2069 } 2070 } 2071 2072 if (PrevDecl && 2073 (!AllowOverloadingOfFunction(PrevDecl, Context) || 2074 !IsOverload(NewFD, PrevDecl, MatchedDecl))) { 2075 Redeclaration = true; 2076 Decl *OldDecl = PrevDecl; 2077 2078 // If PrevDecl was an overloaded function, extract the 2079 // FunctionDecl that matched. 2080 if (isa<OverloadedFunctionDecl>(PrevDecl)) 2081 OldDecl = *MatchedDecl; 2082 2083 // NewFD and PrevDecl represent declarations that need to be 2084 // merged. 2085 if (MergeFunctionDecl(NewFD, OldDecl)) 2086 InvalidDecl = true; 2087 2088 if (!InvalidDecl) { 2089 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 2090 2091 // An out-of-line member function declaration must also be a 2092 // definition (C++ [dcl.meaning]p1). 2093 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 2094 !InvalidDecl) { 2095 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2096 << D.getCXXScopeSpec().getRange(); 2097 NewFD->setInvalidDecl(); 2098 } 2099 } 2100 } 2101 } 2102 2103 if (D.getCXXScopeSpec().isSet() && 2104 (!PrevDecl || !Redeclaration)) { 2105 // The user tried to provide an out-of-line definition for a 2106 // function that is a member of a class or namespace, but there 2107 // was no such member function declared (C++ [class.mfct]p2, 2108 // C++ [namespace.memdef]p2). For example: 2109 // 2110 // class X { 2111 // void f() const; 2112 // }; 2113 // 2114 // void X::f() { } // ill-formed 2115 // 2116 // Complain about this problem, and attempt to suggest close 2117 // matches (e.g., those that differ only in cv-qualifiers and 2118 // whether the parameter types are references). 2119 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 2120 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 2121 InvalidDecl = true; 2122 2123 LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 2124 true); 2125 assert(!Prev.isAmbiguous() && 2126 "Cannot have an ambiguity in previous-declaration lookup"); 2127 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 2128 Func != FuncEnd; ++Func) { 2129 if (isa<FunctionDecl>(*Func) && 2130 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 2131 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 2132 } 2133 2134 PrevDecl = 0; 2135 } 2136 2137 // Handle attributes. We need to have merged decls when handling attributes 2138 // (for example to check for conflicts, etc). 2139 ProcessDeclAttributes(NewFD, D); 2140 AddKnownFunctionAttributes(NewFD); 2141 2142 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 2143 // If a function name is overloadable in C, then every function 2144 // with that name must be marked "overloadable". 2145 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 2146 << Redeclaration << NewFD; 2147 if (PrevDecl) 2148 Diag(PrevDecl->getLocation(), 2149 diag::note_attribute_overloadable_prev_overload); 2150 NewFD->addAttr(::new (Context) OverloadableAttr()); 2151 } 2152 2153 if (getLangOptions().CPlusPlus) { 2154 // In C++, check default arguments now that we have merged decls. Unless 2155 // the lexical context is the class, because in this case this is done 2156 // during delayed parsing anyway. 2157 if (!CurContext->isRecord()) 2158 CheckCXXDefaultArguments(NewFD); 2159 2160 // An out-of-line member function declaration must also be a 2161 // definition (C++ [dcl.meaning]p1). 2162 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && !InvalidDecl) { 2163 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2164 << D.getCXXScopeSpec().getRange(); 2165 InvalidDecl = true; 2166 } 2167 } 2168 2169 // If this is a locally-scoped extern C function, update the 2170 // map of such names. 2171 if (CurContext->isFunctionOrMethod() && NewFD->isExternC(Context) 2172 && !InvalidDecl) 2173 RegisterLocallyScopedExternCDecl(NewFD, PrevDecl, S); 2174 2175 return NewFD; 2176} 2177 2178bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 2179 // FIXME: Need strict checking. In C89, we need to check for 2180 // any assignment, increment, decrement, function-calls, or 2181 // commas outside of a sizeof. In C99, it's the same list, 2182 // except that the aforementioned are allowed in unevaluated 2183 // expressions. Everything else falls under the 2184 // "may accept other forms of constant expressions" exception. 2185 // (We never end up here for C++, so the constant expression 2186 // rules there don't matter.) 2187 if (Init->isConstantInitializer(Context)) 2188 return false; 2189 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 2190 << Init->getSourceRange(); 2191 return true; 2192} 2193 2194void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init) { 2195 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 2196} 2197 2198/// AddInitializerToDecl - Adds the initializer Init to the 2199/// declaration dcl. If DirectInit is true, this is C++ direct 2200/// initialization rather than copy initialization. 2201void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init, bool DirectInit) { 2202 Decl *RealDecl = static_cast<Decl *>(dcl); 2203 // If there is no declaration, there was an error parsing it. Just ignore 2204 // the initializer. 2205 if (RealDecl == 0) 2206 return; 2207 2208 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 2209 // With declarators parsed the way they are, the parser cannot 2210 // distinguish between a normal initializer and a pure-specifier. 2211 // Thus this grotesque test. 2212 IntegerLiteral *IL; 2213 Expr *Init = static_cast<Expr *>(init.get()); 2214 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 2215 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 2216 if (Method->isVirtual()) 2217 Method->setPure(); 2218 else { 2219 Diag(Method->getLocation(), diag::err_non_virtual_pure) 2220 << Method->getDeclName() << Init->getSourceRange(); 2221 Method->setInvalidDecl(); 2222 } 2223 } else { 2224 Diag(Method->getLocation(), diag::err_member_function_initialization) 2225 << Method->getDeclName() << Init->getSourceRange(); 2226 Method->setInvalidDecl(); 2227 } 2228 return; 2229 } 2230 2231 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2232 if (!VDecl) { 2233 if (getLangOptions().CPlusPlus && 2234 RealDecl->getLexicalDeclContext()->isRecord() && 2235 isa<NamedDecl>(RealDecl)) 2236 Diag(RealDecl->getLocation(), diag::err_member_initialization) 2237 << cast<NamedDecl>(RealDecl)->getDeclName(); 2238 else 2239 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2240 RealDecl->setInvalidDecl(); 2241 return; 2242 } 2243 2244 const VarDecl *Def = 0; 2245 if (VDecl->getDefinition(Def)) { 2246 Diag(VDecl->getLocation(), diag::err_redefinition) 2247 << VDecl->getDeclName(); 2248 Diag(Def->getLocation(), diag::note_previous_definition); 2249 VDecl->setInvalidDecl(); 2250 return; 2251 } 2252 2253 // Take ownership of the expression, now that we're sure we have somewhere 2254 // to put it. 2255 Expr *Init = static_cast<Expr *>(init.release()); 2256 assert(Init && "missing initializer"); 2257 2258 // Get the decls type and save a reference for later, since 2259 // CheckInitializerTypes may change it. 2260 QualType DclT = VDecl->getType(), SavT = DclT; 2261 if (VDecl->isBlockVarDecl()) { 2262 VarDecl::StorageClass SC = VDecl->getStorageClass(); 2263 if (SC == VarDecl::Extern) { // C99 6.7.8p5 2264 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2265 VDecl->setInvalidDecl(); 2266 } else if (!VDecl->isInvalidDecl()) { 2267 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2268 VDecl->getDeclName(), DirectInit)) 2269 VDecl->setInvalidDecl(); 2270 2271 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2272 // Don't check invalid declarations to avoid emitting useless diagnostics. 2273 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2274 if (SC == VarDecl::Static) // C99 6.7.8p4. 2275 CheckForConstantInitializer(Init, DclT); 2276 } 2277 } 2278 } else if (VDecl->isStaticDataMember() && 2279 VDecl->getLexicalDeclContext()->isRecord()) { 2280 // This is an in-class initialization for a static data member, e.g., 2281 // 2282 // struct S { 2283 // static const int value = 17; 2284 // }; 2285 2286 // Attach the initializer 2287 VDecl->setInit(Init); 2288 2289 // C++ [class.mem]p4: 2290 // A member-declarator can contain a constant-initializer only 2291 // if it declares a static member (9.4) of const integral or 2292 // const enumeration type, see 9.4.2. 2293 QualType T = VDecl->getType(); 2294 if (!T->isDependentType() && 2295 (!Context.getCanonicalType(T).isConstQualified() || 2296 !T->isIntegralType())) { 2297 Diag(VDecl->getLocation(), diag::err_member_initialization) 2298 << VDecl->getDeclName() << Init->getSourceRange(); 2299 VDecl->setInvalidDecl(); 2300 } else { 2301 // C++ [class.static.data]p4: 2302 // If a static data member is of const integral or const 2303 // enumeration type, its declaration in the class definition 2304 // can specify a constant-initializer which shall be an 2305 // integral constant expression (5.19). 2306 if (!Init->isTypeDependent() && 2307 !Init->getType()->isIntegralType()) { 2308 // We have a non-dependent, non-integral or enumeration type. 2309 Diag(Init->getSourceRange().getBegin(), 2310 diag::err_in_class_initializer_non_integral_type) 2311 << Init->getType() << Init->getSourceRange(); 2312 VDecl->setInvalidDecl(); 2313 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 2314 // Check whether the expression is a constant expression. 2315 llvm::APSInt Value; 2316 SourceLocation Loc; 2317 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 2318 Diag(Loc, diag::err_in_class_initializer_non_constant) 2319 << Init->getSourceRange(); 2320 VDecl->setInvalidDecl(); 2321 } 2322 } 2323 } 2324 } else if (VDecl->isFileVarDecl()) { 2325 if (VDecl->getStorageClass() == VarDecl::Extern) 2326 Diag(VDecl->getLocation(), diag::warn_extern_init); 2327 if (!VDecl->isInvalidDecl()) 2328 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2329 VDecl->getDeclName(), DirectInit)) 2330 VDecl->setInvalidDecl(); 2331 2332 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2333 // Don't check invalid declarations to avoid emitting useless diagnostics. 2334 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2335 // C99 6.7.8p4. All file scoped initializers need to be constant. 2336 CheckForConstantInitializer(Init, DclT); 2337 } 2338 } 2339 // If the type changed, it means we had an incomplete type that was 2340 // completed by the initializer. For example: 2341 // int ary[] = { 1, 3, 5 }; 2342 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2343 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2344 VDecl->setType(DclT); 2345 Init->setType(DclT); 2346 } 2347 2348 // Attach the initializer to the decl. 2349 VDecl->setInit(Init); 2350 return; 2351} 2352 2353void Sema::ActOnUninitializedDecl(DeclTy *dcl) { 2354 Decl *RealDecl = static_cast<Decl *>(dcl); 2355 2356 // If there is no declaration, there was an error parsing it. Just ignore it. 2357 if (RealDecl == 0) 2358 return; 2359 2360 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2361 QualType Type = Var->getType(); 2362 // C++ [dcl.init.ref]p3: 2363 // The initializer can be omitted for a reference only in a 2364 // parameter declaration (8.3.5), in the declaration of a 2365 // function return type, in the declaration of a class member 2366 // within its class declaration (9.2), and where the extern 2367 // specifier is explicitly used. 2368 if (Type->isReferenceType() && 2369 Var->getStorageClass() != VarDecl::Extern && 2370 Var->getStorageClass() != VarDecl::PrivateExtern) { 2371 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2372 << Var->getDeclName() 2373 << SourceRange(Var->getLocation(), Var->getLocation()); 2374 Var->setInvalidDecl(); 2375 return; 2376 } 2377 2378 // C++ [dcl.init]p9: 2379 // 2380 // If no initializer is specified for an object, and the object 2381 // is of (possibly cv-qualified) non-POD class type (or array 2382 // thereof), the object shall be default-initialized; if the 2383 // object is of const-qualified type, the underlying class type 2384 // shall have a user-declared default constructor. 2385 if (getLangOptions().CPlusPlus) { 2386 QualType InitType = Type; 2387 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2388 InitType = Array->getElementType(); 2389 if (Var->getStorageClass() != VarDecl::Extern && 2390 Var->getStorageClass() != VarDecl::PrivateExtern && 2391 InitType->isRecordType()) { 2392 const CXXConstructorDecl *Constructor = 0; 2393 if (!RequireCompleteType(Var->getLocation(), InitType, 2394 diag::err_invalid_incomplete_type_use)) 2395 Constructor 2396 = PerformInitializationByConstructor(InitType, 0, 0, 2397 Var->getLocation(), 2398 SourceRange(Var->getLocation(), 2399 Var->getLocation()), 2400 Var->getDeclName(), 2401 IK_Default); 2402 if (!Constructor) 2403 Var->setInvalidDecl(); 2404 } 2405 } 2406 2407#if 0 2408 // FIXME: Temporarily disabled because we are not properly parsing 2409 // linkage specifications on declarations, e.g., 2410 // 2411 // extern "C" const CGPoint CGPointerZero; 2412 // 2413 // C++ [dcl.init]p9: 2414 // 2415 // If no initializer is specified for an object, and the 2416 // object is of (possibly cv-qualified) non-POD class type (or 2417 // array thereof), the object shall be default-initialized; if 2418 // the object is of const-qualified type, the underlying class 2419 // type shall have a user-declared default 2420 // constructor. Otherwise, if no initializer is specified for 2421 // an object, the object and its subobjects, if any, have an 2422 // indeterminate initial value; if the object or any of its 2423 // subobjects are of const-qualified type, the program is 2424 // ill-formed. 2425 // 2426 // This isn't technically an error in C, so we don't diagnose it. 2427 // 2428 // FIXME: Actually perform the POD/user-defined default 2429 // constructor check. 2430 if (getLangOptions().CPlusPlus && 2431 Context.getCanonicalType(Type).isConstQualified() && 2432 Var->getStorageClass() != VarDecl::Extern) 2433 Diag(Var->getLocation(), diag::err_const_var_requires_init) 2434 << Var->getName() 2435 << SourceRange(Var->getLocation(), Var->getLocation()); 2436#endif 2437 } 2438} 2439 2440/// The declarators are chained together backwards, reverse the list. 2441Sema::DeclTy *Sema::FinalizeDeclaratorGroup(Scope *S, DeclTy *group) { 2442 // Often we have single declarators, handle them quickly. 2443 Decl *Group = static_cast<Decl*>(group); 2444 if (Group == 0) 2445 return 0; 2446 2447 Decl *NewGroup = 0; 2448 if (Group->getNextDeclarator() == 0) 2449 NewGroup = Group; 2450 else { // reverse the list. 2451 while (Group) { 2452 Decl *Next = Group->getNextDeclarator(); 2453 Group->setNextDeclarator(NewGroup); 2454 NewGroup = Group; 2455 Group = Next; 2456 } 2457 } 2458 // Perform semantic analysis that depends on having fully processed both 2459 // the declarator and initializer. 2460 for (Decl *ID = NewGroup; ID; ID = ID->getNextDeclarator()) { 2461 VarDecl *IDecl = dyn_cast<VarDecl>(ID); 2462 if (!IDecl) 2463 continue; 2464 QualType T = IDecl->getType(); 2465 2466 // Block scope. C99 6.7p7: If an identifier for an object is declared with 2467 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 2468 if (IDecl->isBlockVarDecl() && 2469 IDecl->getStorageClass() != VarDecl::Extern) { 2470 if (!IDecl->isInvalidDecl() && 2471 RequireCompleteType(IDecl->getLocation(), T, 2472 diag::err_typecheck_decl_incomplete_type)) 2473 IDecl->setInvalidDecl(); 2474 } 2475 // File scope. C99 6.9.2p2: A declaration of an identifier for and 2476 // object that has file scope without an initializer, and without a 2477 // storage-class specifier or with the storage-class specifier "static", 2478 // constitutes a tentative definition. Note: A tentative definition with 2479 // external linkage is valid (C99 6.2.2p5). 2480 if (IDecl->isTentativeDefinition(Context)) { 2481 QualType CheckType = T; 2482 unsigned DiagID = diag::err_typecheck_decl_incomplete_type; 2483 2484 const IncompleteArrayType *ArrayT = Context.getAsIncompleteArrayType(T); 2485 if (ArrayT) { 2486 CheckType = ArrayT->getElementType(); 2487 DiagID = diag::err_illegal_decl_array_incomplete_type; 2488 } 2489 2490 if (IDecl->isInvalidDecl()) { 2491 // Do nothing with invalid declarations 2492 } else if ((ArrayT || IDecl->getStorageClass() == VarDecl::Static) && 2493 RequireCompleteType(IDecl->getLocation(), CheckType, DiagID)) { 2494 // C99 6.9.2p3: If the declaration of an identifier for an object is 2495 // a tentative definition and has internal linkage (C99 6.2.2p3), the 2496 // declared type shall not be an incomplete type. 2497 IDecl->setInvalidDecl(); 2498 } 2499 } 2500 } 2501 return NewGroup; 2502} 2503 2504/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 2505/// to introduce parameters into function prototype scope. 2506Sema::DeclTy * 2507Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 2508 const DeclSpec &DS = D.getDeclSpec(); 2509 2510 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 2511 VarDecl::StorageClass StorageClass = VarDecl::None; 2512 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2513 StorageClass = VarDecl::Register; 2514 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2515 Diag(DS.getStorageClassSpecLoc(), 2516 diag::err_invalid_storage_class_in_func_decl); 2517 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2518 } 2519 if (DS.isThreadSpecified()) { 2520 Diag(DS.getThreadSpecLoc(), 2521 diag::err_invalid_storage_class_in_func_decl); 2522 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2523 } 2524 2525 // Check that there are no default arguments inside the type of this 2526 // parameter (C++ only). 2527 if (getLangOptions().CPlusPlus) 2528 CheckExtraCXXDefaultArguments(D); 2529 2530 // In this context, we *do not* check D.getInvalidType(). If the declarator 2531 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 2532 // though it will not reflect the user specified type. 2533 QualType parmDeclType = GetTypeForDeclarator(D, S); 2534 2535 assert(!parmDeclType.isNull() && "GetTypeForDeclarator() returned null type"); 2536 2537 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 2538 // Can this happen for params? We already checked that they don't conflict 2539 // among each other. Here they can only shadow globals, which is ok. 2540 IdentifierInfo *II = D.getIdentifier(); 2541 if (II) { 2542 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2543 if (PrevDecl->isTemplateParameter()) { 2544 // Maybe we will complain about the shadowed template parameter. 2545 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2546 // Just pretend that we didn't see the previous declaration. 2547 PrevDecl = 0; 2548 } else if (S->isDeclScope(PrevDecl)) { 2549 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 2550 2551 // Recover by removing the name 2552 II = 0; 2553 D.SetIdentifier(0, D.getIdentifierLoc()); 2554 } 2555 } 2556 } 2557 2558 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 2559 // Doing the promotion here has a win and a loss. The win is the type for 2560 // both Decl's and DeclRefExpr's will match (a convenient invariant for the 2561 // code generator). The loss is the orginal type isn't preserved. For example: 2562 // 2563 // void func(int parmvardecl[5]) { // convert "int [5]" to "int *" 2564 // int blockvardecl[5]; 2565 // sizeof(parmvardecl); // size == 4 2566 // sizeof(blockvardecl); // size == 20 2567 // } 2568 // 2569 // For expressions, all implicit conversions are captured using the 2570 // ImplicitCastExpr AST node (we have no such mechanism for Decl's). 2571 // 2572 // FIXME: If a source translation tool needs to see the original type, then 2573 // we need to consider storing both types (in ParmVarDecl)... 2574 // 2575 if (parmDeclType->isArrayType()) { 2576 // int x[restrict 4] -> int *restrict 2577 parmDeclType = Context.getArrayDecayedType(parmDeclType); 2578 } else if (parmDeclType->isFunctionType()) 2579 parmDeclType = Context.getPointerType(parmDeclType); 2580 2581 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, 2582 D.getIdentifierLoc(), II, 2583 parmDeclType, StorageClass, 2584 0); 2585 2586 if (D.getInvalidType()) 2587 New->setInvalidDecl(); 2588 2589 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 2590 if (D.getCXXScopeSpec().isSet()) { 2591 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 2592 << D.getCXXScopeSpec().getRange(); 2593 New->setInvalidDecl(); 2594 } 2595 // Parameter declarators cannot be interface types. All ObjC objects are 2596 // passed by reference. 2597 if (parmDeclType->isObjCInterfaceType()) { 2598 Diag(D.getIdentifierLoc(), diag::err_object_cannot_be_by_value) 2599 << "passed"; 2600 New->setInvalidDecl(); 2601 } 2602 2603 // Add the parameter declaration into this scope. 2604 S->AddDecl(New); 2605 if (II) 2606 IdResolver.AddDecl(New); 2607 2608 ProcessDeclAttributes(New, D); 2609 return New; 2610 2611} 2612 2613void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D) { 2614 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2615 "Not a function declarator!"); 2616 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2617 2618 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 2619 // for a K&R function. 2620 if (!FTI.hasPrototype) { 2621 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2622 if (FTI.ArgInfo[i].Param == 0) { 2623 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 2624 << FTI.ArgInfo[i].Ident; 2625 // Implicitly declare the argument as type 'int' for lack of a better 2626 // type. 2627 DeclSpec DS; 2628 const char* PrevSpec; // unused 2629 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 2630 PrevSpec); 2631 Declarator ParamD(DS, Declarator::KNRTypeListContext); 2632 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 2633 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 2634 } 2635 } 2636 } 2637} 2638 2639Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 2640 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 2641 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2642 "Not a function declarator!"); 2643 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2644 2645 if (FTI.hasPrototype) { 2646 // FIXME: Diagnose arguments without names in C. 2647 } 2648 2649 Scope *ParentScope = FnBodyScope->getParent(); 2650 2651 return ActOnStartOfFunctionDef(FnBodyScope, 2652 ActOnDeclarator(ParentScope, D, 0, 2653 /*IsFunctionDefinition=*/true)); 2654} 2655 2656Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclTy *D) { 2657 Decl *decl = static_cast<Decl*>(D); 2658 FunctionDecl *FD = cast<FunctionDecl>(decl); 2659 2660 // See if this is a redefinition. 2661 const FunctionDecl *Definition; 2662 if (FD->getBody(Definition)) { 2663 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 2664 Diag(Definition->getLocation(), diag::note_previous_definition); 2665 } 2666 2667 // Builtin functions cannot be defined. 2668 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 2669 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2670 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 2671 FD->setInvalidDecl(); 2672 } 2673 } 2674 2675 // The return type of a function definition must be complete 2676 // (C99 6.9.1p3) 2677 if (FD->getResultType()->isIncompleteType() && 2678 !FD->getResultType()->isVoidType()) { 2679 Diag(FD->getLocation(), diag::err_func_def_incomplete_result) << FD; 2680 FD->setInvalidDecl(); 2681 } 2682 2683 PushDeclContext(FnBodyScope, FD); 2684 2685 // Check the validity of our function parameters 2686 CheckParmsForFunctionDef(FD); 2687 2688 // Introduce our parameters into the function scope 2689 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 2690 ParmVarDecl *Param = FD->getParamDecl(p); 2691 Param->setOwningFunction(FD); 2692 2693 // If this has an identifier, add it to the scope stack. 2694 if (Param->getIdentifier()) 2695 PushOnScopeChains(Param, FnBodyScope); 2696 } 2697 2698 // Checking attributes of current function definition 2699 // dllimport attribute. 2700 if (FD->getAttr<DLLImportAttr>() && (!FD->getAttr<DLLExportAttr>())) { 2701 // dllimport attribute cannot be applied to definition. 2702 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 2703 Diag(FD->getLocation(), 2704 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 2705 << "dllimport"; 2706 FD->setInvalidDecl(); 2707 return FD; 2708 } else { 2709 // If a symbol previously declared dllimport is later defined, the 2710 // attribute is ignored in subsequent references, and a warning is 2711 // emitted. 2712 Diag(FD->getLocation(), 2713 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 2714 << FD->getNameAsCString() << "dllimport"; 2715 } 2716 } 2717 return FD; 2718} 2719 2720static bool StatementCreatesScope(Stmt* S) { 2721 bool result = false; 2722 if (DeclStmt* DS = dyn_cast<DeclStmt>(S)) { 2723 for (DeclStmt::decl_iterator i = DS->decl_begin(); 2724 i != DS->decl_end(); ++i) { 2725 if (VarDecl* D = dyn_cast<VarDecl>(*i)) { 2726 result |= D->getType()->isVariablyModifiedType(); 2727 result |= !!D->getAttr<CleanupAttr>(); 2728 } else if (TypedefDecl* D = dyn_cast<TypedefDecl>(*i)) { 2729 result |= D->getUnderlyingType()->isVariablyModifiedType(); 2730 } 2731 } 2732 } 2733 2734 return result; 2735} 2736 2737void Sema::RecursiveCalcLabelScopes(llvm::DenseMap<Stmt*, void*>& LabelScopeMap, 2738 llvm::DenseMap<void*, Stmt*>& PopScopeMap, 2739 std::vector<void*>& ScopeStack, 2740 Stmt* CurStmt, 2741 Stmt* ParentCompoundStmt) { 2742 for (Stmt::child_iterator i = CurStmt->child_begin(); 2743 i != CurStmt->child_end(); ++i) { 2744 if (!*i) continue; 2745 if (StatementCreatesScope(*i)) { 2746 ScopeStack.push_back(*i); 2747 PopScopeMap[*i] = ParentCompoundStmt; 2748 } else if (isa<LabelStmt>(CurStmt)) { 2749 LabelScopeMap[CurStmt] = ScopeStack.size() ? ScopeStack.back() : 0; 2750 } 2751 if (isa<DeclStmt>(*i)) continue; 2752 Stmt* CurCompound = isa<CompoundStmt>(*i) ? *i : ParentCompoundStmt; 2753 RecursiveCalcLabelScopes(LabelScopeMap, PopScopeMap, ScopeStack, 2754 *i, CurCompound); 2755 } 2756 2757 while (ScopeStack.size() && PopScopeMap[ScopeStack.back()] == CurStmt) { 2758 ScopeStack.pop_back(); 2759 } 2760} 2761 2762void Sema::RecursiveCalcJumpScopes(llvm::DenseMap<Stmt*, void*>& LabelScopeMap, 2763 llvm::DenseMap<void*, Stmt*>& PopScopeMap, 2764 llvm::DenseMap<Stmt*, void*>& GotoScopeMap, 2765 std::vector<void*>& ScopeStack, 2766 Stmt* CurStmt) { 2767 for (Stmt::child_iterator i = CurStmt->child_begin(); 2768 i != CurStmt->child_end(); ++i) { 2769 if (!*i) continue; 2770 if (StatementCreatesScope(*i)) { 2771 ScopeStack.push_back(*i); 2772 } else if (GotoStmt* GS = dyn_cast<GotoStmt>(*i)) { 2773 void* LScope = LabelScopeMap[GS->getLabel()]; 2774 if (LScope) { 2775 bool foundScopeInStack = false; 2776 for (unsigned i = ScopeStack.size(); i > 0; --i) { 2777 if (LScope == ScopeStack[i-1]) { 2778 foundScopeInStack = true; 2779 break; 2780 } 2781 } 2782 if (!foundScopeInStack) { 2783 Diag(GS->getSourceRange().getBegin(), diag::err_goto_into_scope); 2784 } 2785 } 2786 } 2787 if (isa<DeclStmt>(*i)) continue; 2788 RecursiveCalcJumpScopes(LabelScopeMap, PopScopeMap, GotoScopeMap, 2789 ScopeStack, *i); 2790 } 2791 2792 while (ScopeStack.size() && PopScopeMap[ScopeStack.back()] == CurStmt) { 2793 ScopeStack.pop_back(); 2794 } 2795} 2796 2797Sema::DeclTy *Sema::ActOnFinishFunctionBody(DeclTy *D, StmtArg BodyArg) { 2798 Decl *dcl = static_cast<Decl *>(D); 2799 Stmt *Body = static_cast<Stmt*>(BodyArg.release()); 2800 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 2801 FD->setBody(cast<CompoundStmt>(Body)); 2802 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 2803 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 2804 assert(MD == getCurMethodDecl() && "Method parsing confused"); 2805 MD->setBody(cast<CompoundStmt>(Body)); 2806 } else { 2807 Body->Destroy(Context); 2808 return 0; 2809 } 2810 PopDeclContext(); 2811 // Verify and clean out per-function state. 2812 2813 bool HaveLabels = !LabelMap.empty(); 2814 // Check goto/label use. 2815 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 2816 I = LabelMap.begin(), E = LabelMap.end(); I != E; ++I) { 2817 // Verify that we have no forward references left. If so, there was a goto 2818 // or address of a label taken, but no definition of it. Label fwd 2819 // definitions are indicated with a null substmt. 2820 if (I->second->getSubStmt() == 0) { 2821 LabelStmt *L = I->second; 2822 // Emit error. 2823 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 2824 2825 // At this point, we have gotos that use the bogus label. Stitch it into 2826 // the function body so that they aren't leaked and that the AST is well 2827 // formed. 2828 if (Body) { 2829#if 0 2830 // FIXME: Why do this? Having a 'push_back' in CompoundStmt is ugly, 2831 // and the AST is malformed anyway. We should just blow away 'L'. 2832 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 2833 cast<CompoundStmt>(Body)->push_back(L); 2834#else 2835 L->Destroy(Context); 2836#endif 2837 } else { 2838 // The whole function wasn't parsed correctly, just delete this. 2839 L->Destroy(Context); 2840 } 2841 } 2842 } 2843 LabelMap.clear(); 2844 2845 if (!Body) return D; 2846 2847 if (HaveLabels) { 2848 llvm::DenseMap<Stmt*, void*> LabelScopeMap; 2849 llvm::DenseMap<void*, Stmt*> PopScopeMap; 2850 llvm::DenseMap<Stmt*, void*> GotoScopeMap; 2851 std::vector<void*> ScopeStack; 2852 RecursiveCalcLabelScopes(LabelScopeMap, PopScopeMap, ScopeStack, Body, Body); 2853 RecursiveCalcJumpScopes(LabelScopeMap, PopScopeMap, GotoScopeMap, ScopeStack, Body); 2854 } 2855 2856 return D; 2857} 2858 2859/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 2860/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 2861NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 2862 IdentifierInfo &II, Scope *S) { 2863 // Before we produce a declaration for an implicitly defined 2864 // function, see whether there was a locally-scoped declaration of 2865 // this name as a function or variable. If so, use that 2866 // (non-visible) declaration, and complain about it. 2867 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2868 = LocallyScopedExternalDecls.find(&II); 2869 if (Pos != LocallyScopedExternalDecls.end()) { 2870 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 2871 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 2872 return Pos->second; 2873 } 2874 2875 // Extension in C99. Legal in C90, but warn about it. 2876 if (getLangOptions().C99) 2877 Diag(Loc, diag::ext_implicit_function_decl) << &II; 2878 else 2879 Diag(Loc, diag::warn_implicit_function_decl) << &II; 2880 2881 // FIXME: handle stuff like: 2882 // void foo() { extern float X(); } 2883 // void bar() { X(); } <-- implicit decl for X in another scope. 2884 2885 // Set a Declarator for the implicit definition: int foo(); 2886 const char *Dummy; 2887 DeclSpec DS; 2888 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 2889 Error = Error; // Silence warning. 2890 assert(!Error && "Error setting up implicit decl!"); 2891 Declarator D(DS, Declarator::BlockContext); 2892 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 2893 0, 0, 0, Loc, D), 2894 SourceLocation()); 2895 D.SetIdentifier(&II, Loc); 2896 2897 // Insert this function into translation-unit scope. 2898 2899 DeclContext *PrevDC = CurContext; 2900 CurContext = Context.getTranslationUnitDecl(); 2901 2902 FunctionDecl *FD = 2903 dyn_cast<FunctionDecl>(static_cast<Decl*>(ActOnDeclarator(TUScope, D, 0))); 2904 FD->setImplicit(); 2905 2906 CurContext = PrevDC; 2907 2908 AddKnownFunctionAttributes(FD); 2909 2910 return FD; 2911} 2912 2913/// \brief Adds any function attributes that we know a priori based on 2914/// the declaration of this function. 2915/// 2916/// These attributes can apply both to implicitly-declared builtins 2917/// (like __builtin___printf_chk) or to library-declared functions 2918/// like NSLog or printf. 2919void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 2920 if (FD->isInvalidDecl()) 2921 return; 2922 2923 // If this is a built-in function, map its builtin attributes to 2924 // actual attributes. 2925 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 2926 // Handle printf-formatting attributes. 2927 unsigned FormatIdx; 2928 bool HasVAListArg; 2929 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 2930 if (!FD->getAttr<FormatAttr>()) 2931 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 2932 FormatIdx + 2)); 2933 } 2934 2935 // Mark const if we don't care about errno and that is the only 2936 // thing preventing the function from being const. This allows 2937 // IRgen to use LLVM intrinsics for such functions. 2938 if (!getLangOptions().MathErrno && 2939 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 2940 if (!FD->getAttr<ConstAttr>()) 2941 FD->addAttr(::new (Context) ConstAttr()); 2942 } 2943 } 2944 2945 IdentifierInfo *Name = FD->getIdentifier(); 2946 if (!Name) 2947 return; 2948 if ((!getLangOptions().CPlusPlus && 2949 FD->getDeclContext()->isTranslationUnit()) || 2950 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 2951 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 2952 LinkageSpecDecl::lang_c)) { 2953 // Okay: this could be a libc/libm/Objective-C function we know 2954 // about. 2955 } else 2956 return; 2957 2958 unsigned KnownID; 2959 for (KnownID = 0; KnownID != id_num_known_functions; ++KnownID) 2960 if (KnownFunctionIDs[KnownID] == Name) 2961 break; 2962 2963 switch (KnownID) { 2964 case id_NSLog: 2965 case id_NSLogv: 2966 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 2967 // FIXME: We known better than our headers. 2968 const_cast<FormatAttr *>(Format)->setType("printf"); 2969 } else 2970 FD->addAttr(::new (Context) FormatAttr("printf", 1, 2)); 2971 break; 2972 2973 case id_asprintf: 2974 case id_vasprintf: 2975 if (!FD->getAttr<FormatAttr>()) 2976 FD->addAttr(::new (Context) FormatAttr("printf", 2, 3)); 2977 break; 2978 2979 default: 2980 // Unknown function or known function without any attributes to 2981 // add. Do nothing. 2982 break; 2983 } 2984} 2985 2986TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 2987 Decl *LastDeclarator) { 2988 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 2989 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 2990 2991 // Scope manipulation handled by caller. 2992 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 2993 D.getIdentifierLoc(), 2994 D.getIdentifier(), 2995 T); 2996 2997 if (TagType *TT = dyn_cast<TagType>(T)) { 2998 TagDecl *TD = TT->getDecl(); 2999 3000 // If the TagDecl that the TypedefDecl points to is an anonymous decl 3001 // keep track of the TypedefDecl. 3002 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 3003 TD->setTypedefForAnonDecl(NewTD); 3004 } 3005 3006 NewTD->setNextDeclarator(LastDeclarator); 3007 if (D.getInvalidType()) 3008 NewTD->setInvalidDecl(); 3009 return NewTD; 3010} 3011 3012/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 3013/// former case, Name will be non-null. In the later case, Name will be null. 3014/// TagSpec indicates what kind of tag this is. TK indicates whether this is a 3015/// reference/declaration/definition of a tag. 3016Sema::DeclTy *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, 3017 SourceLocation KWLoc, const CXXScopeSpec &SS, 3018 IdentifierInfo *Name, SourceLocation NameLoc, 3019 AttributeList *Attr) { 3020 // If this is not a definition, it must have a name. 3021 assert((Name != 0 || TK == TK_Definition) && 3022 "Nameless record must be a definition!"); 3023 3024 TagDecl::TagKind Kind; 3025 switch (TagSpec) { 3026 default: assert(0 && "Unknown tag type!"); 3027 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 3028 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 3029 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 3030 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 3031 } 3032 3033 DeclContext *SearchDC = CurContext; 3034 DeclContext *DC = CurContext; 3035 NamedDecl *PrevDecl = 0; 3036 3037 bool Invalid = false; 3038 3039 if (Name && SS.isNotEmpty()) { 3040 // We have a nested-name tag ('struct foo::bar'). 3041 3042 // Check for invalid 'foo::'. 3043 if (SS.isInvalid()) { 3044 Name = 0; 3045 goto CreateNewDecl; 3046 } 3047 3048 // FIXME: RequireCompleteDeclContext(SS)? 3049 DC = computeDeclContext(SS); 3050 SearchDC = DC; 3051 // Look-up name inside 'foo::'. 3052 PrevDecl = dyn_cast_or_null<TagDecl>( 3053 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 3054 3055 // A tag 'foo::bar' must already exist. 3056 if (PrevDecl == 0) { 3057 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 3058 Name = 0; 3059 goto CreateNewDecl; 3060 } 3061 } else if (Name) { 3062 // If this is a named struct, check to see if there was a previous forward 3063 // declaration or definition. 3064 // FIXME: We're looking into outer scopes here, even when we 3065 // shouldn't be. Doing so can result in ambiguities that we 3066 // shouldn't be diagnosing. 3067 LookupResult R = LookupName(S, Name, LookupTagName, 3068 /*RedeclarationOnly=*/(TK != TK_Reference)); 3069 if (R.isAmbiguous()) { 3070 DiagnoseAmbiguousLookup(R, Name, NameLoc); 3071 // FIXME: This is not best way to recover from case like: 3072 // 3073 // struct S s; 3074 // 3075 // causes needless err_ovl_no_viable_function_in_init latter. 3076 Name = 0; 3077 PrevDecl = 0; 3078 Invalid = true; 3079 } 3080 else 3081 PrevDecl = R; 3082 3083 if (!getLangOptions().CPlusPlus && TK != TK_Reference) { 3084 // FIXME: This makes sure that we ignore the contexts associated 3085 // with C structs, unions, and enums when looking for a matching 3086 // tag declaration or definition. See the similar lookup tweak 3087 // in Sema::LookupName; is there a better way to deal with this? 3088 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 3089 SearchDC = SearchDC->getParent(); 3090 } 3091 } 3092 3093 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3094 // Maybe we will complain about the shadowed template parameter. 3095 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 3096 // Just pretend that we didn't see the previous declaration. 3097 PrevDecl = 0; 3098 } 3099 3100 if (PrevDecl) { 3101 // Check whether the previous declaration is usable. 3102 (void)DiagnoseUseOfDecl(PrevDecl, NameLoc); 3103 3104 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 3105 // If this is a use of a previous tag, or if the tag is already declared 3106 // in the same scope (so that the definition/declaration completes or 3107 // rementions the tag), reuse the decl. 3108 if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { 3109 // Make sure that this wasn't declared as an enum and now used as a 3110 // struct or something similar. 3111 if (PrevTagDecl->getTagKind() != Kind) { 3112 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 3113 Diag(PrevDecl->getLocation(), diag::note_previous_use); 3114 // Recover by making this an anonymous redefinition. 3115 Name = 0; 3116 PrevDecl = 0; 3117 Invalid = true; 3118 } else { 3119 // If this is a use, just return the declaration we found. 3120 3121 // FIXME: In the future, return a variant or some other clue 3122 // for the consumer of this Decl to know it doesn't own it. 3123 // For our current ASTs this shouldn't be a problem, but will 3124 // need to be changed with DeclGroups. 3125 if (TK == TK_Reference) 3126 return PrevDecl; 3127 3128 // Diagnose attempts to redefine a tag. 3129 if (TK == TK_Definition) { 3130 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 3131 Diag(NameLoc, diag::err_redefinition) << Name; 3132 Diag(Def->getLocation(), diag::note_previous_definition); 3133 // If this is a redefinition, recover by making this 3134 // struct be anonymous, which will make any later 3135 // references get the previous definition. 3136 Name = 0; 3137 PrevDecl = 0; 3138 Invalid = true; 3139 } else { 3140 // If the type is currently being defined, complain 3141 // about a nested redefinition. 3142 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 3143 if (Tag->isBeingDefined()) { 3144 Diag(NameLoc, diag::err_nested_redefinition) << Name; 3145 Diag(PrevTagDecl->getLocation(), 3146 diag::note_previous_definition); 3147 Name = 0; 3148 PrevDecl = 0; 3149 Invalid = true; 3150 } 3151 } 3152 3153 // Okay, this is definition of a previously declared or referenced 3154 // tag PrevDecl. We're going to create a new Decl for it. 3155 } 3156 } 3157 // If we get here we have (another) forward declaration or we 3158 // have a definition. Just create a new decl. 3159 } else { 3160 // If we get here, this is a definition of a new tag type in a nested 3161 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 3162 // new decl/type. We set PrevDecl to NULL so that the entities 3163 // have distinct types. 3164 PrevDecl = 0; 3165 } 3166 // If we get here, we're going to create a new Decl. If PrevDecl 3167 // is non-NULL, it's a definition of the tag declared by 3168 // PrevDecl. If it's NULL, we have a new definition. 3169 } else { 3170 // PrevDecl is a namespace, template, or anything else 3171 // that lives in the IDNS_Tag identifier namespace. 3172 if (isDeclInScope(PrevDecl, SearchDC, S)) { 3173 // The tag name clashes with a namespace name, issue an error and 3174 // recover by making this tag be anonymous. 3175 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 3176 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3177 Name = 0; 3178 PrevDecl = 0; 3179 Invalid = true; 3180 } else { 3181 // The existing declaration isn't relevant to us; we're in a 3182 // new scope, so clear out the previous declaration. 3183 PrevDecl = 0; 3184 } 3185 } 3186 } else if (TK == TK_Reference && SS.isEmpty() && Name && 3187 (Kind != TagDecl::TK_enum || !getLangOptions().CPlusPlus)) { 3188 // C.scope.pdecl]p5: 3189 // -- for an elaborated-type-specifier of the form 3190 // 3191 // class-key identifier 3192 // 3193 // if the elaborated-type-specifier is used in the 3194 // decl-specifier-seq or parameter-declaration-clause of a 3195 // function defined in namespace scope, the identifier is 3196 // declared as a class-name in the namespace that contains 3197 // the declaration; otherwise, except as a friend 3198 // declaration, the identifier is declared in the smallest 3199 // non-class, non-function-prototype scope that contains the 3200 // declaration. 3201 // 3202 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 3203 // C structs and unions. 3204 // 3205 // GNU C also supports this behavior as part of its incomplete 3206 // enum types extension, while GNU C++ does not. 3207 // 3208 // Find the context where we'll be declaring the tag. 3209 // FIXME: We would like to maintain the current DeclContext as the 3210 // lexical context, 3211 while (SearchDC->isRecord()) 3212 SearchDC = SearchDC->getParent(); 3213 3214 // Find the scope where we'll be declaring the tag. 3215 while (S->isClassScope() || 3216 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 3217 ((S->getFlags() & Scope::DeclScope) == 0) || 3218 (S->getEntity() && 3219 ((DeclContext *)S->getEntity())->isTransparentContext())) 3220 S = S->getParent(); 3221 } 3222 3223CreateNewDecl: 3224 3225 // If there is an identifier, use the location of the identifier as the 3226 // location of the decl, otherwise use the location of the struct/union 3227 // keyword. 3228 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 3229 3230 // Otherwise, create a new declaration. If there is a previous 3231 // declaration of the same entity, the two will be linked via 3232 // PrevDecl. 3233 TagDecl *New; 3234 3235 if (Kind == TagDecl::TK_enum) { 3236 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3237 // enum X { A, B, C } D; D should chain to X. 3238 New = EnumDecl::Create(Context, SearchDC, Loc, Name, 3239 cast_or_null<EnumDecl>(PrevDecl)); 3240 // If this is an undefined enum, warn. 3241 if (TK != TK_Definition && !Invalid) { 3242 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 3243 : diag::ext_forward_ref_enum; 3244 Diag(Loc, DK); 3245 } 3246 } else { 3247 // struct/union/class 3248 3249 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3250 // struct X { int A; } D; D should chain to X. 3251 if (getLangOptions().CPlusPlus) 3252 // FIXME: Look for a way to use RecordDecl for simple structs. 3253 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3254 cast_or_null<CXXRecordDecl>(PrevDecl)); 3255 else 3256 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3257 cast_or_null<RecordDecl>(PrevDecl)); 3258 } 3259 3260 if (Kind != TagDecl::TK_enum) { 3261 // Handle #pragma pack: if the #pragma pack stack has non-default 3262 // alignment, make up a packed attribute for this decl. These 3263 // attributes are checked when the ASTContext lays out the 3264 // structure. 3265 // 3266 // It is important for implementing the correct semantics that this 3267 // happen here (in act on tag decl). The #pragma pack stack is 3268 // maintained as a result of parser callbacks which can occur at 3269 // many points during the parsing of a struct declaration (because 3270 // the #pragma tokens are effectively skipped over during the 3271 // parsing of the struct). 3272 if (unsigned Alignment = getPragmaPackAlignment()) 3273 New->addAttr(::new (Context) PackedAttr(Alignment * 8)); 3274 } 3275 3276 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 3277 // C++ [dcl.typedef]p3: 3278 // [...] Similarly, in a given scope, a class or enumeration 3279 // shall not be declared with the same name as a typedef-name 3280 // that is declared in that scope and refers to a type other 3281 // than the class or enumeration itself. 3282 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 3283 TypedefDecl *PrevTypedef = 0; 3284 if (Lookup.getKind() == LookupResult::Found) 3285 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 3286 3287 if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && 3288 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 3289 Context.getCanonicalType(Context.getTypeDeclType(New))) { 3290 Diag(Loc, diag::err_tag_definition_of_typedef) 3291 << Context.getTypeDeclType(New) 3292 << PrevTypedef->getUnderlyingType(); 3293 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 3294 Invalid = true; 3295 } 3296 } 3297 3298 if (Invalid) 3299 New->setInvalidDecl(); 3300 3301 if (Attr) 3302 ProcessDeclAttributeList(New, Attr); 3303 3304 // If we're declaring or defining a tag in function prototype scope 3305 // in C, note that this type can only be used within the function. 3306 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 3307 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 3308 3309 // Set the lexical context. If the tag has a C++ scope specifier, the 3310 // lexical context will be different from the semantic context. 3311 New->setLexicalDeclContext(CurContext); 3312 3313 if (TK == TK_Definition) 3314 New->startDefinition(); 3315 3316 // If this has an identifier, add it to the scope stack. 3317 if (Name) { 3318 S = getNonFieldDeclScope(S); 3319 PushOnScopeChains(New, S); 3320 } else { 3321 CurContext->addDecl(New); 3322 } 3323 3324 return New; 3325} 3326 3327void Sema::ActOnTagStartDefinition(Scope *S, DeclTy *TagD) { 3328 AdjustDeclIfTemplate(TagD); 3329 TagDecl *Tag = cast<TagDecl>((Decl *)TagD); 3330 3331 // Enter the tag context. 3332 PushDeclContext(S, Tag); 3333 3334 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 3335 FieldCollector->StartClass(); 3336 3337 if (Record->getIdentifier()) { 3338 // C++ [class]p2: 3339 // [...] The class-name is also inserted into the scope of the 3340 // class itself; this is known as the injected-class-name. For 3341 // purposes of access checking, the injected-class-name is treated 3342 // as if it were a public member name. 3343 RecordDecl *InjectedClassName 3344 = CXXRecordDecl::Create(Context, Record->getTagKind(), 3345 CurContext, Record->getLocation(), 3346 Record->getIdentifier(), Record); 3347 InjectedClassName->setImplicit(); 3348 PushOnScopeChains(InjectedClassName, S); 3349 } 3350 } 3351} 3352 3353void Sema::ActOnTagFinishDefinition(Scope *S, DeclTy *TagD) { 3354 AdjustDeclIfTemplate(TagD); 3355 TagDecl *Tag = cast<TagDecl>((Decl *)TagD); 3356 3357 if (isa<CXXRecordDecl>(Tag)) 3358 FieldCollector->FinishClass(); 3359 3360 // Exit this scope of this tag's definition. 3361 PopDeclContext(); 3362 3363 // Notify the consumer that we've defined a tag. 3364 Consumer.HandleTagDeclDefinition(Tag); 3365} 3366 3367bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 3368 QualType FieldTy, const Expr *BitWidth) { 3369 // C99 6.7.2.1p4 - verify the field type. 3370 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 3371 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 3372 // Handle incomplete types with specific error. 3373 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 3374 return true; 3375 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 3376 << FieldName << FieldTy << BitWidth->getSourceRange(); 3377 } 3378 3379 // If the bit-width is type- or value-dependent, don't try to check 3380 // it now. 3381 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 3382 return false; 3383 3384 llvm::APSInt Value; 3385 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 3386 return true; 3387 3388 // Zero-width bitfield is ok for anonymous field. 3389 if (Value == 0 && FieldName) 3390 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 3391 3392 if (Value.isSigned() && Value.isNegative()) 3393 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 3394 << FieldName << Value.toString(10); 3395 3396 if (!FieldTy->isDependentType()) { 3397 uint64_t TypeSize = Context.getTypeSize(FieldTy); 3398 // FIXME: We won't need the 0 size once we check that the field type is valid. 3399 if (TypeSize && Value.getZExtValue() > TypeSize) 3400 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 3401 << FieldName << (unsigned)TypeSize; 3402 } 3403 3404 return false; 3405} 3406 3407/// ActOnField - Each field of a struct/union/class is passed into this in order 3408/// to create a FieldDecl object for it. 3409Sema::DeclTy *Sema::ActOnField(Scope *S, DeclTy *TagD, 3410 SourceLocation DeclStart, 3411 Declarator &D, ExprTy *BitfieldWidth) { 3412 3413 return HandleField(S, static_cast<RecordDecl*>(TagD), DeclStart, D, 3414 static_cast<Expr*>(BitfieldWidth), 3415 AS_public); 3416} 3417 3418/// HandleField - Analyze a field of a C struct or a C++ data member. 3419/// 3420FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 3421 SourceLocation DeclStart, 3422 Declarator &D, Expr *BitWidth, 3423 AccessSpecifier AS) { 3424 IdentifierInfo *II = D.getIdentifier(); 3425 SourceLocation Loc = DeclStart; 3426 if (II) Loc = D.getIdentifierLoc(); 3427 3428 QualType T = GetTypeForDeclarator(D, S); 3429 3430 if (getLangOptions().CPlusPlus) { 3431 CheckExtraCXXDefaultArguments(D); 3432 3433 if (D.getDeclSpec().isVirtualSpecified()) 3434 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3435 diag::err_virtual_non_function); 3436 } 3437 3438 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3439 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 3440 PrevDecl = 0; 3441 3442 FieldDecl *NewFD 3443 = CheckFieldDecl(II, T, Record, Loc, 3444 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable, 3445 BitWidth, AS, PrevDecl, &D); 3446 if (NewFD->isInvalidDecl() && PrevDecl) { 3447 // Don't introduce NewFD into scope; there's already something 3448 // with the same name in the same scope. 3449 } else if (II) { 3450 PushOnScopeChains(NewFD, S); 3451 } else 3452 Record->addDecl(NewFD); 3453 3454 return NewFD; 3455} 3456 3457/// \brief Build a new FieldDecl and check its well-formedness. 3458/// 3459/// This routine builds a new FieldDecl given the fields name, type, 3460/// record, etc. \p PrevDecl should refer to any previous declaration 3461/// with the same name and in the same scope as the field to be 3462/// created. 3463/// 3464/// \returns a new FieldDecl. 3465/// 3466/// \todo The Declarator argument is a hack. It will be removed once 3467FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 3468 RecordDecl *Record, SourceLocation Loc, 3469 bool Mutable, Expr *BitWidth, 3470 AccessSpecifier AS, NamedDecl *PrevDecl, 3471 Declarator *D) { 3472 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3473 bool InvalidDecl = false; 3474 3475 // If we receive a broken type, recover by assuming 'int' and 3476 // marking this declaration as invalid. 3477 if (T.isNull()) { 3478 InvalidDecl = true; 3479 T = Context.IntTy; 3480 } 3481 3482 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3483 // than a variably modified type. 3484 if (T->isVariablyModifiedType()) { 3485 bool SizeIsNegative; 3486 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 3487 SizeIsNegative); 3488 if (!FixedTy.isNull()) { 3489 Diag(Loc, diag::warn_illegal_constant_array_size); 3490 T = FixedTy; 3491 } else { 3492 if (SizeIsNegative) 3493 Diag(Loc, diag::err_typecheck_negative_array_size); 3494 else 3495 Diag(Loc, diag::err_typecheck_field_variable_size); 3496 T = Context.IntTy; 3497 InvalidDecl = true; 3498 } 3499 } 3500 3501 // If this is declared as a bit-field, check the bit-field. 3502 if (BitWidth && VerifyBitField(Loc, II, T, BitWidth)) { 3503 InvalidDecl = true; 3504 DeleteExpr(BitWidth); 3505 BitWidth = 0; 3506 } 3507 3508 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, BitWidth, 3509 Mutable); 3510 3511 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 3512 Diag(Loc, diag::err_duplicate_member) << II; 3513 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3514 NewFD->setInvalidDecl(); 3515 Record->setInvalidDecl(); 3516 } 3517 3518 if (getLangOptions().CPlusPlus && !T->isPODType()) 3519 cast<CXXRecordDecl>(Record)->setPOD(false); 3520 3521 // FIXME: We need to pass in the attributes given an AST 3522 // representation, not a parser representation. 3523 if (D) 3524 ProcessDeclAttributes(NewFD, *D); 3525 3526 if (T.isObjCGCWeak()) 3527 Diag(Loc, diag::warn_attribute_weak_on_field); 3528 3529 if (InvalidDecl) 3530 NewFD->setInvalidDecl(); 3531 3532 NewFD->setAccess(AS); 3533 3534 // C++ [dcl.init.aggr]p1: 3535 // An aggregate is an array or a class (clause 9) with [...] no 3536 // private or protected non-static data members (clause 11). 3537 // A POD must be an aggregate. 3538 if (getLangOptions().CPlusPlus && 3539 (AS == AS_private || AS == AS_protected)) { 3540 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 3541 CXXRecord->setAggregate(false); 3542 CXXRecord->setPOD(false); 3543 } 3544 3545 return NewFD; 3546} 3547 3548/// TranslateIvarVisibility - Translate visibility from a token ID to an 3549/// AST enum value. 3550static ObjCIvarDecl::AccessControl 3551TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 3552 switch (ivarVisibility) { 3553 default: assert(0 && "Unknown visitibility kind"); 3554 case tok::objc_private: return ObjCIvarDecl::Private; 3555 case tok::objc_public: return ObjCIvarDecl::Public; 3556 case tok::objc_protected: return ObjCIvarDecl::Protected; 3557 case tok::objc_package: return ObjCIvarDecl::Package; 3558 } 3559} 3560 3561/// ActOnIvar - Each ivar field of an objective-c class is passed into this 3562/// in order to create an IvarDecl object for it. 3563Sema::DeclTy *Sema::ActOnIvar(Scope *S, 3564 SourceLocation DeclStart, 3565 Declarator &D, ExprTy *BitfieldWidth, 3566 tok::ObjCKeywordKind Visibility) { 3567 3568 IdentifierInfo *II = D.getIdentifier(); 3569 Expr *BitWidth = (Expr*)BitfieldWidth; 3570 SourceLocation Loc = DeclStart; 3571 if (II) Loc = D.getIdentifierLoc(); 3572 3573 // FIXME: Unnamed fields can be handled in various different ways, for 3574 // example, unnamed unions inject all members into the struct namespace! 3575 3576 QualType T = GetTypeForDeclarator(D, S); 3577 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3578 bool InvalidDecl = false; 3579 3580 if (BitWidth) { 3581 // 6.7.2.1p3, 6.7.2.1p4 3582 if (VerifyBitField(Loc, II, T, BitWidth)) { 3583 InvalidDecl = true; 3584 DeleteExpr(BitWidth); 3585 BitWidth = 0; 3586 } 3587 } else { 3588 // Not a bitfield. 3589 3590 // validate II. 3591 3592 } 3593 3594 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3595 // than a variably modified type. 3596 if (T->isVariablyModifiedType()) { 3597 Diag(Loc, diag::err_typecheck_ivar_variable_size); 3598 InvalidDecl = true; 3599 } 3600 3601 // Get the visibility (access control) for this ivar. 3602 ObjCIvarDecl::AccessControl ac = 3603 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 3604 : ObjCIvarDecl::None; 3605 3606 // Construct the decl. 3607 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, CurContext, Loc, II, T,ac, 3608 (Expr *)BitfieldWidth); 3609 3610 if (II) { 3611 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3612 if (PrevDecl && isDeclInScope(PrevDecl, CurContext, S) 3613 && !isa<TagDecl>(PrevDecl)) { 3614 Diag(Loc, diag::err_duplicate_member) << II; 3615 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3616 NewID->setInvalidDecl(); 3617 } 3618 } 3619 3620 // Process attributes attached to the ivar. 3621 ProcessDeclAttributes(NewID, D); 3622 3623 if (D.getInvalidType() || InvalidDecl) 3624 NewID->setInvalidDecl(); 3625 3626 if (II) { 3627 // FIXME: When interfaces are DeclContexts, we'll need to add 3628 // these to the interface. 3629 S->AddDecl(NewID); 3630 IdResolver.AddDecl(NewID); 3631 } 3632 3633 return NewID; 3634} 3635 3636void Sema::ActOnFields(Scope* S, 3637 SourceLocation RecLoc, DeclTy *RecDecl, 3638 DeclTy **Fields, unsigned NumFields, 3639 SourceLocation LBrac, SourceLocation RBrac, 3640 AttributeList *Attr) { 3641 Decl *EnclosingDecl = static_cast<Decl*>(RecDecl); 3642 assert(EnclosingDecl && "missing record or interface decl"); 3643 3644 // If the decl this is being inserted into is invalid, then it may be a 3645 // redeclaration or some other bogus case. Don't try to add fields to it. 3646 if (EnclosingDecl->isInvalidDecl()) { 3647 // FIXME: Deallocate fields? 3648 return; 3649 } 3650 3651 3652 // Verify that all the fields are okay. 3653 unsigned NumNamedMembers = 0; 3654 llvm::SmallVector<FieldDecl*, 32> RecFields; 3655 3656 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 3657 for (unsigned i = 0; i != NumFields; ++i) { 3658 FieldDecl *FD = cast_or_null<FieldDecl>(static_cast<Decl*>(Fields[i])); 3659 assert(FD && "missing field decl"); 3660 3661 // Get the type for the field. 3662 Type *FDTy = FD->getType().getTypePtr(); 3663 3664 if (!FD->isAnonymousStructOrUnion()) { 3665 // Remember all fields written by the user. 3666 RecFields.push_back(FD); 3667 } 3668 3669 // If the field is already invalid for some reason, don't emit more 3670 // diagnostics about it. 3671 if (FD->isInvalidDecl()) 3672 continue; 3673 3674 // C99 6.7.2.1p2 - A field may not be a function type. 3675 if (FDTy->isFunctionType()) { 3676 Diag(FD->getLocation(), diag::err_field_declared_as_function) 3677 << FD->getDeclName(); 3678 FD->setInvalidDecl(); 3679 EnclosingDecl->setInvalidDecl(); 3680 continue; 3681 } 3682 // C99 6.7.2.1p2 - A field may not be an incomplete type except... 3683 if (FDTy->isIncompleteType()) { 3684 if (!Record) { // Incomplete ivar type is always an error. 3685 RequireCompleteType(FD->getLocation(), FD->getType(), 3686 diag::err_field_incomplete); 3687 FD->setInvalidDecl(); 3688 EnclosingDecl->setInvalidDecl(); 3689 continue; 3690 } 3691 if (i != NumFields-1 || // ... that the last member ... 3692 !Record->isStruct() || // ... of a structure ... 3693 !FDTy->isArrayType()) { //... may have incomplete array type. 3694 RequireCompleteType(FD->getLocation(), FD->getType(), 3695 diag::err_field_incomplete); 3696 FD->setInvalidDecl(); 3697 EnclosingDecl->setInvalidDecl(); 3698 continue; 3699 } 3700 if (NumNamedMembers < 1) { //... must have more than named member ... 3701 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 3702 << FD->getDeclName(); 3703 FD->setInvalidDecl(); 3704 EnclosingDecl->setInvalidDecl(); 3705 continue; 3706 } 3707 // Okay, we have a legal flexible array member at the end of the struct. 3708 if (Record) 3709 Record->setHasFlexibleArrayMember(true); 3710 } 3711 /// C99 6.7.2.1p2 - a struct ending in a flexible array member cannot be the 3712 /// field of another structure or the element of an array. 3713 if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 3714 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 3715 // If this is a member of a union, then entire union becomes "flexible". 3716 if (Record && Record->isUnion()) { 3717 Record->setHasFlexibleArrayMember(true); 3718 } else { 3719 // If this is a struct/class and this is not the last element, reject 3720 // it. Note that GCC supports variable sized arrays in the middle of 3721 // structures. 3722 if (i != NumFields-1) 3723 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 3724 << FD->getDeclName(); 3725 else { 3726 // We support flexible arrays at the end of structs in 3727 // other structs as an extension. 3728 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 3729 << FD->getDeclName(); 3730 if (Record) 3731 Record->setHasFlexibleArrayMember(true); 3732 } 3733 } 3734 } 3735 } 3736 /// A field cannot be an Objective-c object 3737 if (FDTy->isObjCInterfaceType()) { 3738 Diag(FD->getLocation(), diag::err_statically_allocated_object); 3739 FD->setInvalidDecl(); 3740 EnclosingDecl->setInvalidDecl(); 3741 continue; 3742 } 3743 // Keep track of the number of named members. 3744 if (FD->getIdentifier()) 3745 ++NumNamedMembers; 3746 } 3747 3748 // Okay, we successfully defined 'Record'. 3749 if (Record) { 3750 Record->completeDefinition(Context); 3751 } else { 3752 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 3753 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 3754 ID->setIVarList(ClsFields, RecFields.size(), Context); 3755 ID->setLocEnd(RBrac); 3756 3757 // Must enforce the rule that ivars in the base classes may not be 3758 // duplicates. 3759 if (ID->getSuperClass()) { 3760 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 3761 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 3762 ObjCIvarDecl* Ivar = (*IVI); 3763 IdentifierInfo *II = Ivar->getIdentifier(); 3764 ObjCIvarDecl* prevIvar = 3765 ID->getSuperClass()->lookupInstanceVariable(II); 3766 if (prevIvar) { 3767 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 3768 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 3769 } 3770 } 3771 } 3772 } else if (ObjCImplementationDecl *IMPDecl = 3773 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 3774 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 3775 IMPDecl->setIVarList(ClsFields, RecFields.size(), Context); 3776 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 3777 } 3778 } 3779 3780 if (Attr) 3781 ProcessDeclAttributeList(Record, Attr); 3782} 3783 3784EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 3785 EnumConstantDecl *LastEnumConst, 3786 SourceLocation IdLoc, 3787 IdentifierInfo *Id, 3788 ExprArg val) { 3789 Expr *Val = (Expr *)val.get(); 3790 3791 llvm::APSInt EnumVal(32); 3792 QualType EltTy; 3793 if (Val && !Val->isTypeDependent()) { 3794 // Make sure to promote the operand type to int. 3795 UsualUnaryConversions(Val); 3796 if (Val != val.get()) { 3797 val.release(); 3798 val = Val; 3799 } 3800 3801 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 3802 SourceLocation ExpLoc; 3803 if (!Val->isValueDependent() && 3804 VerifyIntegerConstantExpression(Val, &EnumVal)) { 3805 Val = 0; 3806 } else { 3807 EltTy = Val->getType(); 3808 } 3809 } 3810 3811 if (!Val) { 3812 if (LastEnumConst) { 3813 // Assign the last value + 1. 3814 EnumVal = LastEnumConst->getInitVal(); 3815 ++EnumVal; 3816 3817 // Check for overflow on increment. 3818 if (EnumVal < LastEnumConst->getInitVal()) 3819 Diag(IdLoc, diag::warn_enum_value_overflow); 3820 3821 EltTy = LastEnumConst->getType(); 3822 } else { 3823 // First value, set to zero. 3824 EltTy = Context.IntTy; 3825 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 3826 } 3827 } 3828 3829 val.release(); 3830 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 3831 Val, EnumVal); 3832} 3833 3834 3835Sema::DeclTy *Sema::ActOnEnumConstant(Scope *S, DeclTy *theEnumDecl, 3836 DeclTy *lastEnumConst, 3837 SourceLocation IdLoc, IdentifierInfo *Id, 3838 SourceLocation EqualLoc, ExprTy *val) { 3839 EnumDecl *TheEnumDecl = cast<EnumDecl>(static_cast<Decl*>(theEnumDecl)); 3840 EnumConstantDecl *LastEnumConst = 3841 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(lastEnumConst)); 3842 Expr *Val = static_cast<Expr*>(val); 3843 3844 // The scope passed in may not be a decl scope. Zip up the scope tree until 3845 // we find one that is. 3846 S = getNonFieldDeclScope(S); 3847 3848 // Verify that there isn't already something declared with this name in this 3849 // scope. 3850 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 3851 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3852 // Maybe we will complain about the shadowed template parameter. 3853 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 3854 // Just pretend that we didn't see the previous declaration. 3855 PrevDecl = 0; 3856 } 3857 3858 if (PrevDecl) { 3859 // When in C++, we may get a TagDecl with the same name; in this case the 3860 // enum constant will 'hide' the tag. 3861 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 3862 "Received TagDecl when not in C++!"); 3863 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 3864 if (isa<EnumConstantDecl>(PrevDecl)) 3865 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 3866 else 3867 Diag(IdLoc, diag::err_redefinition) << Id; 3868 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3869 if (Val) Val->Destroy(Context); 3870 return 0; 3871 } 3872 } 3873 3874 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 3875 IdLoc, Id, Owned(Val)); 3876 3877 // Register this decl in the current scope stack. 3878 if (New) 3879 PushOnScopeChains(New, S); 3880 3881 return New; 3882} 3883 3884// FIXME: For consistency with ActOnFields(), we should have the parser 3885// pass in the source location for the left/right braces. 3886void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclTy *EnumDeclX, 3887 DeclTy **Elements, unsigned NumElements) { 3888 EnumDecl *Enum = cast<EnumDecl>(static_cast<Decl*>(EnumDeclX)); 3889 QualType EnumType = Context.getTypeDeclType(Enum); 3890 3891 // TODO: If the result value doesn't fit in an int, it must be a long or long 3892 // long value. ISO C does not support this, but GCC does as an extension, 3893 // emit a warning. 3894 unsigned IntWidth = Context.Target.getIntWidth(); 3895 3896 // Verify that all the values are okay, compute the size of the values, and 3897 // reverse the list. 3898 unsigned NumNegativeBits = 0; 3899 unsigned NumPositiveBits = 0; 3900 3901 // Keep track of whether all elements have type int. 3902 bool AllElementsInt = true; 3903 3904 for (unsigned i = 0; i != NumElements; ++i) { 3905 EnumConstantDecl *ECD = 3906 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3907 if (!ECD) continue; // Already issued a diagnostic. 3908 3909 // If the enum value doesn't fit in an int, emit an extension warning. 3910 const llvm::APSInt &InitVal = ECD->getInitVal(); 3911 assert(InitVal.getBitWidth() >= IntWidth && 3912 "Should have promoted value to int"); 3913 if (InitVal.getBitWidth() > IntWidth) { 3914 llvm::APSInt V(InitVal); 3915 V.trunc(IntWidth); 3916 V.extend(InitVal.getBitWidth()); 3917 if (V != InitVal) 3918 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 3919 << InitVal.toString(10); 3920 } 3921 3922 // Keep track of the size of positive and negative values. 3923 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 3924 NumPositiveBits = std::max(NumPositiveBits, 3925 (unsigned)InitVal.getActiveBits()); 3926 else 3927 NumNegativeBits = std::max(NumNegativeBits, 3928 (unsigned)InitVal.getMinSignedBits()); 3929 3930 // Keep track of whether every enum element has type int (very commmon). 3931 if (AllElementsInt) 3932 AllElementsInt = ECD->getType() == Context.IntTy; 3933 } 3934 3935 // Figure out the type that should be used for this enum. 3936 // FIXME: Support attribute(packed) on enums and -fshort-enums. 3937 QualType BestType; 3938 unsigned BestWidth; 3939 3940 if (NumNegativeBits) { 3941 // If there is a negative value, figure out the smallest integer type (of 3942 // int/long/longlong) that fits. 3943 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 3944 BestType = Context.IntTy; 3945 BestWidth = IntWidth; 3946 } else { 3947 BestWidth = Context.Target.getLongWidth(); 3948 3949 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 3950 BestType = Context.LongTy; 3951 else { 3952 BestWidth = Context.Target.getLongLongWidth(); 3953 3954 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 3955 Diag(Enum->getLocation(), diag::warn_enum_too_large); 3956 BestType = Context.LongLongTy; 3957 } 3958 } 3959 } else { 3960 // If there is no negative value, figure out which of uint, ulong, ulonglong 3961 // fits. 3962 if (NumPositiveBits <= IntWidth) { 3963 BestType = Context.UnsignedIntTy; 3964 BestWidth = IntWidth; 3965 } else if (NumPositiveBits <= 3966 (BestWidth = Context.Target.getLongWidth())) { 3967 BestType = Context.UnsignedLongTy; 3968 } else { 3969 BestWidth = Context.Target.getLongLongWidth(); 3970 assert(NumPositiveBits <= BestWidth && 3971 "How could an initializer get larger than ULL?"); 3972 BestType = Context.UnsignedLongLongTy; 3973 } 3974 } 3975 3976 // Loop over all of the enumerator constants, changing their types to match 3977 // the type of the enum if needed. 3978 for (unsigned i = 0; i != NumElements; ++i) { 3979 EnumConstantDecl *ECD = 3980 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3981 if (!ECD) continue; // Already issued a diagnostic. 3982 3983 // Standard C says the enumerators have int type, but we allow, as an 3984 // extension, the enumerators to be larger than int size. If each 3985 // enumerator value fits in an int, type it as an int, otherwise type it the 3986 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 3987 // that X has type 'int', not 'unsigned'. 3988 if (ECD->getType() == Context.IntTy) { 3989 // Make sure the init value is signed. 3990 llvm::APSInt IV = ECD->getInitVal(); 3991 IV.setIsSigned(true); 3992 ECD->setInitVal(IV); 3993 3994 if (getLangOptions().CPlusPlus) 3995 // C++ [dcl.enum]p4: Following the closing brace of an 3996 // enum-specifier, each enumerator has the type of its 3997 // enumeration. 3998 ECD->setType(EnumType); 3999 continue; // Already int type. 4000 } 4001 4002 // Determine whether the value fits into an int. 4003 llvm::APSInt InitVal = ECD->getInitVal(); 4004 bool FitsInInt; 4005 if (InitVal.isUnsigned() || !InitVal.isNegative()) 4006 FitsInInt = InitVal.getActiveBits() < IntWidth; 4007 else 4008 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 4009 4010 // If it fits into an integer type, force it. Otherwise force it to match 4011 // the enum decl type. 4012 QualType NewTy; 4013 unsigned NewWidth; 4014 bool NewSign; 4015 if (FitsInInt) { 4016 NewTy = Context.IntTy; 4017 NewWidth = IntWidth; 4018 NewSign = true; 4019 } else if (ECD->getType() == BestType) { 4020 // Already the right type! 4021 if (getLangOptions().CPlusPlus) 4022 // C++ [dcl.enum]p4: Following the closing brace of an 4023 // enum-specifier, each enumerator has the type of its 4024 // enumeration. 4025 ECD->setType(EnumType); 4026 continue; 4027 } else { 4028 NewTy = BestType; 4029 NewWidth = BestWidth; 4030 NewSign = BestType->isSignedIntegerType(); 4031 } 4032 4033 // Adjust the APSInt value. 4034 InitVal.extOrTrunc(NewWidth); 4035 InitVal.setIsSigned(NewSign); 4036 ECD->setInitVal(InitVal); 4037 4038 // Adjust the Expr initializer and type. 4039 if (ECD->getInitExpr()) 4040 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), 4041 /*isLvalue=*/false)); 4042 if (getLangOptions().CPlusPlus) 4043 // C++ [dcl.enum]p4: Following the closing brace of an 4044 // enum-specifier, each enumerator has the type of its 4045 // enumeration. 4046 ECD->setType(EnumType); 4047 else 4048 ECD->setType(NewTy); 4049 } 4050 4051 Enum->completeDefinition(Context, BestType); 4052} 4053 4054Sema::DeclTy *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 4055 ExprArg expr) { 4056 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr.release()); 4057 4058 return FileScopeAsmDecl::Create(Context, CurContext, Loc, AsmString); 4059} 4060 4061