SemaDecl.cpp revision f36e02d4aff98bf2e52e342e0038d4172fbb5e64
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/Analysis/CFG.h" 19#include "clang/AST/CXXInheritance.h" 20#include "clang/AST/DeclObjC.h" 21#include "clang/AST/DeclTemplate.h" 22#include "clang/AST/ExprCXX.h" 23#include "clang/AST/StmtCXX.h" 24#include "clang/AST/StmtObjC.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Basic/PartialDiagnostic.h" 27#include "clang/Basic/SourceManager.h" 28#include "clang/Basic/TargetInfo.h" 29// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 30#include "clang/Lex/Preprocessor.h" 31#include "clang/Lex/HeaderSearch.h" 32#include "llvm/ADT/BitVector.h" 33#include "llvm/ADT/STLExtras.h" 34#include <algorithm> 35#include <cstring> 36#include <functional> 37#include <queue> 38using namespace clang; 39 40/// getDeclName - Return a pretty name for the specified decl if possible, or 41/// an empty string if not. This is used for pretty crash reporting. 42std::string Sema::getDeclName(DeclPtrTy d) { 43 Decl *D = d.getAs<Decl>(); 44 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 45 return DN->getQualifiedNameAsString(); 46 return ""; 47} 48 49Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) { 50 return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>())); 51} 52 53/// \brief If the identifier refers to a type name within this scope, 54/// return the declaration of that type. 55/// 56/// This routine performs ordinary name lookup of the identifier II 57/// within the given scope, with optional C++ scope specifier SS, to 58/// determine whether the name refers to a type. If so, returns an 59/// opaque pointer (actually a QualType) corresponding to that 60/// type. Otherwise, returns NULL. 61/// 62/// If name lookup results in an ambiguity, this routine will complain 63/// and then return NULL. 64Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 65 Scope *S, const CXXScopeSpec *SS, 66 bool isClassName) { 67 // C++ [temp.res]p3: 68 // A qualified-id that refers to a type and in which the 69 // nested-name-specifier depends on a template-parameter (14.6.2) 70 // shall be prefixed by the keyword typename to indicate that the 71 // qualified-id denotes a type, forming an 72 // elaborated-type-specifier (7.1.5.3). 73 // 74 // We therefore do not perform any name lookup if the result would 75 // refer to a member of an unknown specialization. 76 if (SS && isUnknownSpecialization(*SS)) { 77 if (!isClassName) 78 return 0; 79 80 // We know from the grammar that this name refers to a type, so build a 81 // TypenameType node to describe the type. 82 // FIXME: Record somewhere that this TypenameType node has no "typename" 83 // keyword associated with it. 84 return CheckTypenameType((NestedNameSpecifier *)SS->getScopeRep(), 85 II, SS->getRange()).getAsOpaquePtr(); 86 } 87 88 LookupResult Result; 89 LookupParsedName(Result, S, SS, &II, LookupOrdinaryName, false, false); 90 91 NamedDecl *IIDecl = 0; 92 switch (Result.getKind()) { 93 case LookupResult::NotFound: 94 case LookupResult::FoundOverloaded: 95 return 0; 96 97 case LookupResult::AmbiguousBaseSubobjectTypes: 98 case LookupResult::AmbiguousBaseSubobjects: 99 case LookupResult::AmbiguousReference: { 100 // Look to see if we have a type anywhere in the list of results. 101 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 102 Res != ResEnd; ++Res) { 103 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 104 if (!IIDecl || 105 (*Res)->getLocation().getRawEncoding() < 106 IIDecl->getLocation().getRawEncoding()) 107 IIDecl = *Res; 108 } 109 } 110 111 if (!IIDecl) { 112 // None of the entities we found is a type, so there is no way 113 // to even assume that the result is a type. In this case, don't 114 // complain about the ambiguity. The parser will either try to 115 // perform this lookup again (e.g., as an object name), which 116 // will produce the ambiguity, or will complain that it expected 117 // a type name. 118 return 0; 119 } 120 121 // We found a type within the ambiguous lookup; diagnose the 122 // ambiguity and then return that type. This might be the right 123 // answer, or it might not be, but it suppresses any attempt to 124 // perform the name lookup again. 125 DiagnoseAmbiguousLookup(Result, DeclarationName(&II), NameLoc); 126 break; 127 } 128 129 case LookupResult::Found: 130 IIDecl = Result.getFoundDecl(); 131 break; 132 } 133 134 if (IIDecl) { 135 QualType T; 136 137 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 138 // Check whether we can use this type 139 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 140 141 if (getLangOptions().CPlusPlus) { 142 // C++ [temp.local]p2: 143 // Within the scope of a class template specialization or 144 // partial specialization, when the injected-class-name is 145 // not followed by a <, it is equivalent to the 146 // injected-class-name followed by the template-argument s 147 // of the class template specialization or partial 148 // specialization enclosed in <>. 149 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) 150 if (RD->isInjectedClassName()) 151 if (ClassTemplateDecl *Template = RD->getDescribedClassTemplate()) 152 T = Template->getInjectedClassNameType(Context); 153 } 154 155 if (T.isNull()) 156 T = Context.getTypeDeclType(TD); 157 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 158 // Check whether we can use this interface. 159 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 160 161 T = Context.getObjCInterfaceType(IDecl); 162 } else 163 return 0; 164 165 if (SS) 166 T = getQualifiedNameType(*SS, T); 167 168 return T.getAsOpaquePtr(); 169 } 170 171 return 0; 172} 173 174/// isTagName() - This method is called *for error recovery purposes only* 175/// to determine if the specified name is a valid tag name ("struct foo"). If 176/// so, this returns the TST for the tag corresponding to it (TST_enum, 177/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 178/// where the user forgot to specify the tag. 179DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 180 // Do a tag name lookup in this scope. 181 LookupResult R; 182 LookupName(R, S, &II, LookupTagName, false, false); 183 if (R.getKind() == LookupResult::Found) 184 if (const TagDecl *TD = dyn_cast<TagDecl>(R.getAsSingleDecl(Context))) { 185 switch (TD->getTagKind()) { 186 case TagDecl::TK_struct: return DeclSpec::TST_struct; 187 case TagDecl::TK_union: return DeclSpec::TST_union; 188 case TagDecl::TK_class: return DeclSpec::TST_class; 189 case TagDecl::TK_enum: return DeclSpec::TST_enum; 190 } 191 } 192 193 return DeclSpec::TST_unspecified; 194} 195 196 197// Determines the context to return to after temporarily entering a 198// context. This depends in an unnecessarily complicated way on the 199// exact ordering of callbacks from the parser. 200DeclContext *Sema::getContainingDC(DeclContext *DC) { 201 202 // Functions defined inline within classes aren't parsed until we've 203 // finished parsing the top-level class, so the top-level class is 204 // the context we'll need to return to. 205 if (isa<FunctionDecl>(DC)) { 206 DC = DC->getLexicalParent(); 207 208 // A function not defined within a class will always return to its 209 // lexical context. 210 if (!isa<CXXRecordDecl>(DC)) 211 return DC; 212 213 // A C++ inline method/friend is parsed *after* the topmost class 214 // it was declared in is fully parsed ("complete"); the topmost 215 // class is the context we need to return to. 216 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 217 DC = RD; 218 219 // Return the declaration context of the topmost class the inline method is 220 // declared in. 221 return DC; 222 } 223 224 if (isa<ObjCMethodDecl>(DC)) 225 return Context.getTranslationUnitDecl(); 226 227 return DC->getLexicalParent(); 228} 229 230void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 231 assert(getContainingDC(DC) == CurContext && 232 "The next DeclContext should be lexically contained in the current one."); 233 CurContext = DC; 234 S->setEntity(DC); 235} 236 237void Sema::PopDeclContext() { 238 assert(CurContext && "DeclContext imbalance!"); 239 240 CurContext = getContainingDC(CurContext); 241} 242 243/// EnterDeclaratorContext - Used when we must lookup names in the context 244/// of a declarator's nested name specifier. 245void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 246 assert(PreDeclaratorDC == 0 && "Previous declarator context not popped?"); 247 PreDeclaratorDC = static_cast<DeclContext*>(S->getEntity()); 248 CurContext = DC; 249 assert(CurContext && "No context?"); 250 S->setEntity(CurContext); 251} 252 253void Sema::ExitDeclaratorContext(Scope *S) { 254 S->setEntity(PreDeclaratorDC); 255 PreDeclaratorDC = 0; 256 257 // Reset CurContext to the nearest enclosing context. 258 while (!S->getEntity() && S->getParent()) 259 S = S->getParent(); 260 CurContext = static_cast<DeclContext*>(S->getEntity()); 261 assert(CurContext && "No context?"); 262} 263 264/// \brief Determine whether we allow overloading of the function 265/// PrevDecl with another declaration. 266/// 267/// This routine determines whether overloading is possible, not 268/// whether some new function is actually an overload. It will return 269/// true in C++ (where we can always provide overloads) or, as an 270/// extension, in C when the previous function is already an 271/// overloaded function declaration or has the "overloadable" 272/// attribute. 273static bool AllowOverloadingOfFunction(Decl *PrevDecl, ASTContext &Context) { 274 if (Context.getLangOptions().CPlusPlus) 275 return true; 276 277 if (isa<OverloadedFunctionDecl>(PrevDecl)) 278 return true; 279 280 return PrevDecl->getAttr<OverloadableAttr>() != 0; 281} 282 283/// Add this decl to the scope shadowed decl chains. 284void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 285 // Move up the scope chain until we find the nearest enclosing 286 // non-transparent context. The declaration will be introduced into this 287 // scope. 288 while (S->getEntity() && 289 ((DeclContext *)S->getEntity())->isTransparentContext()) 290 S = S->getParent(); 291 292 // Add scoped declarations into their context, so that they can be 293 // found later. Declarations without a context won't be inserted 294 // into any context. 295 if (AddToContext) 296 CurContext->addDecl(D); 297 298 // Out-of-line function and variable definitions should not be pushed into 299 // scope. 300 if ((isa<FunctionTemplateDecl>(D) && 301 cast<FunctionTemplateDecl>(D)->getTemplatedDecl()->isOutOfLine()) || 302 (isa<FunctionDecl>(D) && cast<FunctionDecl>(D)->isOutOfLine()) || 303 (isa<VarDecl>(D) && cast<VarDecl>(D)->isOutOfLine())) 304 return; 305 306 // If this replaces anything in the current scope, 307 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 308 IEnd = IdResolver.end(); 309 for (; I != IEnd; ++I) { 310 if (S->isDeclScope(DeclPtrTy::make(*I)) && D->declarationReplaces(*I)) { 311 S->RemoveDecl(DeclPtrTy::make(*I)); 312 IdResolver.RemoveDecl(*I); 313 314 // Should only need to replace one decl. 315 break; 316 } 317 } 318 319 S->AddDecl(DeclPtrTy::make(D)); 320 IdResolver.AddDecl(D); 321} 322 323bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) { 324 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) { 325 // Look inside the overload set to determine if any of the declarations 326 // are in scope. (Possibly) build a new overload set containing only 327 // those declarations that are in scope. 328 OverloadedFunctionDecl *NewOvl = 0; 329 bool FoundInScope = false; 330 for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), 331 FEnd = Ovl->function_end(); 332 F != FEnd; ++F) { 333 NamedDecl *FD = F->get(); 334 if (!isDeclInScope(FD, Ctx, S)) { 335 if (!NewOvl && F != Ovl->function_begin()) { 336 NewOvl = OverloadedFunctionDecl::Create(Context, 337 F->get()->getDeclContext(), 338 F->get()->getDeclName()); 339 D = NewOvl; 340 for (OverloadedFunctionDecl::function_iterator 341 First = Ovl->function_begin(); 342 First != F; ++First) 343 NewOvl->addOverload(*First); 344 } 345 } else { 346 FoundInScope = true; 347 if (NewOvl) 348 NewOvl->addOverload(*F); 349 } 350 } 351 352 return FoundInScope; 353 } 354 355 return IdResolver.isDeclInScope(D, Ctx, Context, S); 356} 357 358void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 359 if (S->decl_empty()) return; 360 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 361 "Scope shouldn't contain decls!"); 362 363 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 364 I != E; ++I) { 365 Decl *TmpD = (*I).getAs<Decl>(); 366 assert(TmpD && "This decl didn't get pushed??"); 367 368 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 369 NamedDecl *D = cast<NamedDecl>(TmpD); 370 371 if (!D->getDeclName()) continue; 372 373 // Diagnose unused variables in this scope. 374 if (!D->isUsed() && !D->hasAttr<UnusedAttr>() && isa<VarDecl>(D) && 375 !isa<ParmVarDecl>(D) && !isa<ImplicitParamDecl>(D) && 376 D->getDeclContext()->isFunctionOrMethod()) 377 Diag(D->getLocation(), diag::warn_unused_variable) << D->getDeclName(); 378 379 // Remove this name from our lexical scope. 380 IdResolver.RemoveDecl(D); 381 } 382} 383 384/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 385/// return 0 if one not found. 386ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 387 // The third "scope" argument is 0 since we aren't enabling lazy built-in 388 // creation from this context. 389 NamedDecl *IDecl = LookupSingleName(TUScope, Id, LookupOrdinaryName); 390 391 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 392} 393 394/// getNonFieldDeclScope - Retrieves the innermost scope, starting 395/// from S, where a non-field would be declared. This routine copes 396/// with the difference between C and C++ scoping rules in structs and 397/// unions. For example, the following code is well-formed in C but 398/// ill-formed in C++: 399/// @code 400/// struct S6 { 401/// enum { BAR } e; 402/// }; 403/// 404/// void test_S6() { 405/// struct S6 a; 406/// a.e = BAR; 407/// } 408/// @endcode 409/// For the declaration of BAR, this routine will return a different 410/// scope. The scope S will be the scope of the unnamed enumeration 411/// within S6. In C++, this routine will return the scope associated 412/// with S6, because the enumeration's scope is a transparent 413/// context but structures can contain non-field names. In C, this 414/// routine will return the translation unit scope, since the 415/// enumeration's scope is a transparent context and structures cannot 416/// contain non-field names. 417Scope *Sema::getNonFieldDeclScope(Scope *S) { 418 while (((S->getFlags() & Scope::DeclScope) == 0) || 419 (S->getEntity() && 420 ((DeclContext *)S->getEntity())->isTransparentContext()) || 421 (S->isClassScope() && !getLangOptions().CPlusPlus)) 422 S = S->getParent(); 423 return S; 424} 425 426void Sema::InitBuiltinVaListType() { 427 if (!Context.getBuiltinVaListType().isNull()) 428 return; 429 430 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 431 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, LookupOrdinaryName); 432 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 433 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 434} 435 436/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 437/// file scope. lazily create a decl for it. ForRedeclaration is true 438/// if we're creating this built-in in anticipation of redeclaring the 439/// built-in. 440NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 441 Scope *S, bool ForRedeclaration, 442 SourceLocation Loc) { 443 Builtin::ID BID = (Builtin::ID)bid; 444 445 if (Context.BuiltinInfo.hasVAListUse(BID)) 446 InitBuiltinVaListType(); 447 448 ASTContext::GetBuiltinTypeError Error; 449 QualType R = Context.GetBuiltinType(BID, Error); 450 switch (Error) { 451 case ASTContext::GE_None: 452 // Okay 453 break; 454 455 case ASTContext::GE_Missing_stdio: 456 if (ForRedeclaration) 457 Diag(Loc, diag::err_implicit_decl_requires_stdio) 458 << Context.BuiltinInfo.GetName(BID); 459 return 0; 460 461 case ASTContext::GE_Missing_setjmp: 462 if (ForRedeclaration) 463 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 464 << Context.BuiltinInfo.GetName(BID); 465 return 0; 466 } 467 468 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 469 Diag(Loc, diag::ext_implicit_lib_function_decl) 470 << Context.BuiltinInfo.GetName(BID) 471 << R; 472 if (Context.BuiltinInfo.getHeaderName(BID) && 473 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 474 != Diagnostic::Ignored) 475 Diag(Loc, diag::note_please_include_header) 476 << Context.BuiltinInfo.getHeaderName(BID) 477 << Context.BuiltinInfo.GetName(BID); 478 } 479 480 FunctionDecl *New = FunctionDecl::Create(Context, 481 Context.getTranslationUnitDecl(), 482 Loc, II, R, /*DInfo=*/0, 483 FunctionDecl::Extern, false, 484 /*hasPrototype=*/true); 485 New->setImplicit(); 486 487 // Create Decl objects for each parameter, adding them to the 488 // FunctionDecl. 489 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 490 llvm::SmallVector<ParmVarDecl*, 16> Params; 491 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 492 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 493 FT->getArgType(i), /*DInfo=*/0, 494 VarDecl::None, 0)); 495 New->setParams(Context, Params.data(), Params.size()); 496 } 497 498 AddKnownFunctionAttributes(New); 499 500 // TUScope is the translation-unit scope to insert this function into. 501 // FIXME: This is hideous. We need to teach PushOnScopeChains to 502 // relate Scopes to DeclContexts, and probably eliminate CurContext 503 // entirely, but we're not there yet. 504 DeclContext *SavedContext = CurContext; 505 CurContext = Context.getTranslationUnitDecl(); 506 PushOnScopeChains(New, TUScope); 507 CurContext = SavedContext; 508 return New; 509} 510 511/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 512/// same name and scope as a previous declaration 'Old'. Figure out 513/// how to resolve this situation, merging decls or emitting 514/// diagnostics as appropriate. If there was an error, set New to be invalid. 515/// 516void Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 517 // If either decl is known invalid already, set the new one to be invalid and 518 // don't bother doing any merging checks. 519 if (New->isInvalidDecl() || OldD->isInvalidDecl()) 520 return New->setInvalidDecl(); 521 522 // Allow multiple definitions for ObjC built-in typedefs. 523 // FIXME: Verify the underlying types are equivalent! 524 if (getLangOptions().ObjC1) { 525 const IdentifierInfo *TypeID = New->getIdentifier(); 526 switch (TypeID->getLength()) { 527 default: break; 528 case 2: 529 if (!TypeID->isStr("id")) 530 break; 531 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 532 // Install the built-in type for 'id', ignoring the current definition. 533 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 534 return; 535 case 5: 536 if (!TypeID->isStr("Class")) 537 break; 538 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 539 // Install the built-in type for 'Class', ignoring the current definition. 540 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 541 return; 542 case 3: 543 if (!TypeID->isStr("SEL")) 544 break; 545 Context.setObjCSelType(Context.getTypeDeclType(New)); 546 return; 547 case 8: 548 if (!TypeID->isStr("Protocol")) 549 break; 550 Context.setObjCProtoType(New->getUnderlyingType()); 551 return; 552 } 553 // Fall through - the typedef name was not a builtin type. 554 } 555 // Verify the old decl was also a type. 556 TypeDecl *Old = dyn_cast<TypeDecl>(OldD); 557 if (!Old) { 558 Diag(New->getLocation(), diag::err_redefinition_different_kind) 559 << New->getDeclName(); 560 if (OldD->getLocation().isValid()) 561 Diag(OldD->getLocation(), diag::note_previous_definition); 562 return New->setInvalidDecl(); 563 } 564 565 // Determine the "old" type we'll use for checking and diagnostics. 566 QualType OldType; 567 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 568 OldType = OldTypedef->getUnderlyingType(); 569 else 570 OldType = Context.getTypeDeclType(Old); 571 572 // If the typedef types are not identical, reject them in all languages and 573 // with any extensions enabled. 574 575 if (OldType != New->getUnderlyingType() && 576 Context.getCanonicalType(OldType) != 577 Context.getCanonicalType(New->getUnderlyingType())) { 578 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 579 << New->getUnderlyingType() << OldType; 580 if (Old->getLocation().isValid()) 581 Diag(Old->getLocation(), diag::note_previous_definition); 582 return New->setInvalidDecl(); 583 } 584 585 if (getLangOptions().Microsoft) 586 return; 587 588 // C++ [dcl.typedef]p2: 589 // In a given non-class scope, a typedef specifier can be used to 590 // redefine the name of any type declared in that scope to refer 591 // to the type to which it already refers. 592 if (getLangOptions().CPlusPlus) { 593 if (!isa<CXXRecordDecl>(CurContext)) 594 return; 595 Diag(New->getLocation(), diag::err_redefinition) 596 << New->getDeclName(); 597 Diag(Old->getLocation(), diag::note_previous_definition); 598 return New->setInvalidDecl(); 599 } 600 601 // If we have a redefinition of a typedef in C, emit a warning. This warning 602 // is normally mapped to an error, but can be controlled with 603 // -Wtypedef-redefinition. If either the original or the redefinition is 604 // in a system header, don't emit this for compatibility with GCC. 605 if (PP.getDiagnostics().getSuppressSystemWarnings() && 606 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 607 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 608 return; 609 610 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 611 << New->getDeclName(); 612 Diag(Old->getLocation(), diag::note_previous_definition); 613 return; 614} 615 616/// DeclhasAttr - returns true if decl Declaration already has the target 617/// attribute. 618static bool 619DeclHasAttr(const Decl *decl, const Attr *target) { 620 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 621 if (attr->getKind() == target->getKind()) 622 return true; 623 624 return false; 625} 626 627/// MergeAttributes - append attributes from the Old decl to the New one. 628static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 629 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 630 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 631 Attr *NewAttr = attr->clone(C); 632 NewAttr->setInherited(true); 633 New->addAttr(NewAttr); 634 } 635 } 636} 637 638/// Used in MergeFunctionDecl to keep track of function parameters in 639/// C. 640struct GNUCompatibleParamWarning { 641 ParmVarDecl *OldParm; 642 ParmVarDecl *NewParm; 643 QualType PromotedType; 644}; 645 646/// MergeFunctionDecl - We just parsed a function 'New' from 647/// declarator D which has the same name and scope as a previous 648/// declaration 'Old'. Figure out how to resolve this situation, 649/// merging decls or emitting diagnostics as appropriate. 650/// 651/// In C++, New and Old must be declarations that are not 652/// overloaded. Use IsOverload to determine whether New and Old are 653/// overloaded, and to select the Old declaration that New should be 654/// merged with. 655/// 656/// Returns true if there was an error, false otherwise. 657bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 658 assert(!isa<OverloadedFunctionDecl>(OldD) && 659 "Cannot merge with an overloaded function declaration"); 660 661 // Verify the old decl was also a function. 662 FunctionDecl *Old = 0; 663 if (FunctionTemplateDecl *OldFunctionTemplate 664 = dyn_cast<FunctionTemplateDecl>(OldD)) 665 Old = OldFunctionTemplate->getTemplatedDecl(); 666 else 667 Old = dyn_cast<FunctionDecl>(OldD); 668 if (!Old) { 669 Diag(New->getLocation(), diag::err_redefinition_different_kind) 670 << New->getDeclName(); 671 Diag(OldD->getLocation(), diag::note_previous_definition); 672 return true; 673 } 674 675 // Determine whether the previous declaration was a definition, 676 // implicit declaration, or a declaration. 677 diag::kind PrevDiag; 678 if (Old->isThisDeclarationADefinition()) 679 PrevDiag = diag::note_previous_definition; 680 else if (Old->isImplicit()) 681 PrevDiag = diag::note_previous_implicit_declaration; 682 else 683 PrevDiag = diag::note_previous_declaration; 684 685 QualType OldQType = Context.getCanonicalType(Old->getType()); 686 QualType NewQType = Context.getCanonicalType(New->getType()); 687 688 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 689 New->getStorageClass() == FunctionDecl::Static && 690 Old->getStorageClass() != FunctionDecl::Static) { 691 Diag(New->getLocation(), diag::err_static_non_static) 692 << New; 693 Diag(Old->getLocation(), PrevDiag); 694 return true; 695 } 696 697 if (getLangOptions().CPlusPlus) { 698 // (C++98 13.1p2): 699 // Certain function declarations cannot be overloaded: 700 // -- Function declarations that differ only in the return type 701 // cannot be overloaded. 702 QualType OldReturnType 703 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 704 QualType NewReturnType 705 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 706 if (OldReturnType != NewReturnType) { 707 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 708 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 709 return true; 710 } 711 712 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 713 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 714 if (OldMethod && NewMethod && !NewMethod->getFriendObjectKind() && 715 NewMethod->getLexicalDeclContext()->isRecord()) { 716 // -- Member function declarations with the same name and the 717 // same parameter types cannot be overloaded if any of them 718 // is a static member function declaration. 719 if (OldMethod->isStatic() || NewMethod->isStatic()) { 720 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 721 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 722 return true; 723 } 724 725 // C++ [class.mem]p1: 726 // [...] A member shall not be declared twice in the 727 // member-specification, except that a nested class or member 728 // class template can be declared and then later defined. 729 unsigned NewDiag; 730 if (isa<CXXConstructorDecl>(OldMethod)) 731 NewDiag = diag::err_constructor_redeclared; 732 else if (isa<CXXDestructorDecl>(NewMethod)) 733 NewDiag = diag::err_destructor_redeclared; 734 else if (isa<CXXConversionDecl>(NewMethod)) 735 NewDiag = diag::err_conv_function_redeclared; 736 else 737 NewDiag = diag::err_member_redeclared; 738 739 Diag(New->getLocation(), NewDiag); 740 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 741 } 742 743 // (C++98 8.3.5p3): 744 // All declarations for a function shall agree exactly in both the 745 // return type and the parameter-type-list. 746 if (OldQType == NewQType) 747 return MergeCompatibleFunctionDecls(New, Old); 748 749 // Fall through for conflicting redeclarations and redefinitions. 750 } 751 752 // C: Function types need to be compatible, not identical. This handles 753 // duplicate function decls like "void f(int); void f(enum X);" properly. 754 if (!getLangOptions().CPlusPlus && 755 Context.typesAreCompatible(OldQType, NewQType)) { 756 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 757 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 758 const FunctionProtoType *OldProto = 0; 759 if (isa<FunctionNoProtoType>(NewFuncType) && 760 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 761 // The old declaration provided a function prototype, but the 762 // new declaration does not. Merge in the prototype. 763 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 764 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 765 OldProto->arg_type_end()); 766 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 767 ParamTypes.data(), ParamTypes.size(), 768 OldProto->isVariadic(), 769 OldProto->getTypeQuals()); 770 New->setType(NewQType); 771 New->setHasInheritedPrototype(); 772 773 // Synthesize a parameter for each argument type. 774 llvm::SmallVector<ParmVarDecl*, 16> Params; 775 for (FunctionProtoType::arg_type_iterator 776 ParamType = OldProto->arg_type_begin(), 777 ParamEnd = OldProto->arg_type_end(); 778 ParamType != ParamEnd; ++ParamType) { 779 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 780 SourceLocation(), 0, 781 *ParamType, /*DInfo=*/0, 782 VarDecl::None, 0); 783 Param->setImplicit(); 784 Params.push_back(Param); 785 } 786 787 New->setParams(Context, Params.data(), Params.size()); 788 } 789 790 return MergeCompatibleFunctionDecls(New, Old); 791 } 792 793 // GNU C permits a K&R definition to follow a prototype declaration 794 // if the declared types of the parameters in the K&R definition 795 // match the types in the prototype declaration, even when the 796 // promoted types of the parameters from the K&R definition differ 797 // from the types in the prototype. GCC then keeps the types from 798 // the prototype. 799 // 800 // If a variadic prototype is followed by a non-variadic K&R definition, 801 // the K&R definition becomes variadic. This is sort of an edge case, but 802 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 803 // C99 6.9.1p8. 804 if (!getLangOptions().CPlusPlus && 805 Old->hasPrototype() && !New->hasPrototype() && 806 New->getType()->getAs<FunctionProtoType>() && 807 Old->getNumParams() == New->getNumParams()) { 808 llvm::SmallVector<QualType, 16> ArgTypes; 809 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 810 const FunctionProtoType *OldProto 811 = Old->getType()->getAs<FunctionProtoType>(); 812 const FunctionProtoType *NewProto 813 = New->getType()->getAs<FunctionProtoType>(); 814 815 // Determine whether this is the GNU C extension. 816 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 817 NewProto->getResultType()); 818 bool LooseCompatible = !MergedReturn.isNull(); 819 for (unsigned Idx = 0, End = Old->getNumParams(); 820 LooseCompatible && Idx != End; ++Idx) { 821 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 822 ParmVarDecl *NewParm = New->getParamDecl(Idx); 823 if (Context.typesAreCompatible(OldParm->getType(), 824 NewProto->getArgType(Idx))) { 825 ArgTypes.push_back(NewParm->getType()); 826 } else if (Context.typesAreCompatible(OldParm->getType(), 827 NewParm->getType())) { 828 GNUCompatibleParamWarning Warn 829 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 830 Warnings.push_back(Warn); 831 ArgTypes.push_back(NewParm->getType()); 832 } else 833 LooseCompatible = false; 834 } 835 836 if (LooseCompatible) { 837 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 838 Diag(Warnings[Warn].NewParm->getLocation(), 839 diag::ext_param_promoted_not_compatible_with_prototype) 840 << Warnings[Warn].PromotedType 841 << Warnings[Warn].OldParm->getType(); 842 Diag(Warnings[Warn].OldParm->getLocation(), 843 diag::note_previous_declaration); 844 } 845 846 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 847 ArgTypes.size(), 848 OldProto->isVariadic(), 0)); 849 return MergeCompatibleFunctionDecls(New, Old); 850 } 851 852 // Fall through to diagnose conflicting types. 853 } 854 855 // A function that has already been declared has been redeclared or defined 856 // with a different type- show appropriate diagnostic 857 if (unsigned BuiltinID = Old->getBuiltinID()) { 858 // The user has declared a builtin function with an incompatible 859 // signature. 860 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 861 // The function the user is redeclaring is a library-defined 862 // function like 'malloc' or 'printf'. Warn about the 863 // redeclaration, then pretend that we don't know about this 864 // library built-in. 865 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 866 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 867 << Old << Old->getType(); 868 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 869 Old->setInvalidDecl(); 870 return false; 871 } 872 873 PrevDiag = diag::note_previous_builtin_declaration; 874 } 875 876 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 877 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 878 return true; 879} 880 881/// \brief Completes the merge of two function declarations that are 882/// known to be compatible. 883/// 884/// This routine handles the merging of attributes and other 885/// properties of function declarations form the old declaration to 886/// the new declaration, once we know that New is in fact a 887/// redeclaration of Old. 888/// 889/// \returns false 890bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 891 // Merge the attributes 892 MergeAttributes(New, Old, Context); 893 894 // Merge the storage class. 895 if (Old->getStorageClass() != FunctionDecl::Extern && 896 Old->getStorageClass() != FunctionDecl::None) 897 New->setStorageClass(Old->getStorageClass()); 898 899 // Merge "pure" flag. 900 if (Old->isPure()) 901 New->setPure(); 902 903 // Merge the "deleted" flag. 904 if (Old->isDeleted()) 905 New->setDeleted(); 906 907 if (getLangOptions().CPlusPlus) 908 return MergeCXXFunctionDecl(New, Old); 909 910 return false; 911} 912 913/// MergeVarDecl - We just parsed a variable 'New' which has the same name 914/// and scope as a previous declaration 'Old'. Figure out how to resolve this 915/// situation, merging decls or emitting diagnostics as appropriate. 916/// 917/// Tentative definition rules (C99 6.9.2p2) are checked by 918/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 919/// definitions here, since the initializer hasn't been attached. 920/// 921void Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 922 // If either decl is invalid, make sure the new one is marked invalid and 923 // don't do any other checking. 924 if (New->isInvalidDecl() || OldD->isInvalidDecl()) 925 return New->setInvalidDecl(); 926 927 // Verify the old decl was also a variable. 928 VarDecl *Old = dyn_cast<VarDecl>(OldD); 929 if (!Old) { 930 Diag(New->getLocation(), diag::err_redefinition_different_kind) 931 << New->getDeclName(); 932 Diag(OldD->getLocation(), diag::note_previous_definition); 933 return New->setInvalidDecl(); 934 } 935 936 MergeAttributes(New, Old, Context); 937 938 // Merge the types 939 QualType MergedT; 940 if (getLangOptions().CPlusPlus) { 941 if (Context.hasSameType(New->getType(), Old->getType())) 942 MergedT = New->getType(); 943 // C++ [basic.types]p7: 944 // [...] The declared type of an array object might be an array of 945 // unknown size and therefore be incomplete at one point in a 946 // translation unit and complete later on; [...] 947 else if (Old->getType()->isIncompleteArrayType() && 948 New->getType()->isArrayType()) { 949 CanQual<ArrayType> OldArray 950 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 951 CanQual<ArrayType> NewArray 952 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 953 if (OldArray->getElementType() == NewArray->getElementType()) 954 MergedT = New->getType(); 955 } 956 } else { 957 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 958 } 959 if (MergedT.isNull()) { 960 Diag(New->getLocation(), diag::err_redefinition_different_type) 961 << New->getDeclName(); 962 Diag(Old->getLocation(), diag::note_previous_definition); 963 return New->setInvalidDecl(); 964 } 965 New->setType(MergedT); 966 967 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 968 if (New->getStorageClass() == VarDecl::Static && 969 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 970 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 971 Diag(Old->getLocation(), diag::note_previous_definition); 972 return New->setInvalidDecl(); 973 } 974 // C99 6.2.2p4: 975 // For an identifier declared with the storage-class specifier 976 // extern in a scope in which a prior declaration of that 977 // identifier is visible,23) if the prior declaration specifies 978 // internal or external linkage, the linkage of the identifier at 979 // the later declaration is the same as the linkage specified at 980 // the prior declaration. If no prior declaration is visible, or 981 // if the prior declaration specifies no linkage, then the 982 // identifier has external linkage. 983 if (New->hasExternalStorage() && Old->hasLinkage()) 984 /* Okay */; 985 else if (New->getStorageClass() != VarDecl::Static && 986 Old->getStorageClass() == VarDecl::Static) { 987 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 988 Diag(Old->getLocation(), diag::note_previous_definition); 989 return New->setInvalidDecl(); 990 } 991 992 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 993 994 // FIXME: The test for external storage here seems wrong? We still 995 // need to check for mismatches. 996 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 997 // Don't complain about out-of-line definitions of static members. 998 !(Old->getLexicalDeclContext()->isRecord() && 999 !New->getLexicalDeclContext()->isRecord())) { 1000 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1001 Diag(Old->getLocation(), diag::note_previous_definition); 1002 return New->setInvalidDecl(); 1003 } 1004 1005 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1006 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1007 Diag(Old->getLocation(), diag::note_previous_definition); 1008 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1009 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1010 Diag(Old->getLocation(), diag::note_previous_definition); 1011 } 1012 1013 // Keep a chain of previous declarations. 1014 New->setPreviousDeclaration(Old); 1015} 1016 1017/// CheckFallThrough - Check that we don't fall off the end of a 1018/// Statement that should return a value. 1019/// 1020/// \returns AlwaysFallThrough iff we always fall off the end of the statement, 1021/// MaybeFallThrough iff we might or might not fall off the end and 1022/// NeverFallThrough iff we never fall off the end of the statement. We assume 1023/// that functions not marked noreturn will return. 1024Sema::ControlFlowKind Sema::CheckFallThrough(Stmt *Root) { 1025 llvm::OwningPtr<CFG> cfg (CFG::buildCFG(Root, &Context)); 1026 1027 // FIXME: They should never return 0, fix that, delete this code. 1028 if (cfg == 0) 1029 return NeverFallThrough; 1030 // The CFG leaves in dead things, and we don't want to dead code paths to 1031 // confuse us, so we mark all live things first. 1032 std::queue<CFGBlock*> workq; 1033 llvm::BitVector live(cfg->getNumBlockIDs()); 1034 // Prep work queue 1035 workq.push(&cfg->getEntry()); 1036 // Solve 1037 while (!workq.empty()) { 1038 CFGBlock *item = workq.front(); 1039 workq.pop(); 1040 live.set(item->getBlockID()); 1041 for (CFGBlock::succ_iterator I=item->succ_begin(), 1042 E=item->succ_end(); 1043 I != E; 1044 ++I) { 1045 if ((*I) && !live[(*I)->getBlockID()]) { 1046 live.set((*I)->getBlockID()); 1047 workq.push(*I); 1048 } 1049 } 1050 } 1051 1052 // Now we know what is live, we check the live precessors of the exit block 1053 // and look for fall through paths, being careful to ignore normal returns, 1054 // and exceptional paths. 1055 bool HasLiveReturn = false; 1056 bool HasFakeEdge = false; 1057 bool HasPlainEdge = false; 1058 for (CFGBlock::succ_iterator I=cfg->getExit().pred_begin(), 1059 E = cfg->getExit().pred_end(); 1060 I != E; 1061 ++I) { 1062 CFGBlock& B = **I; 1063 if (!live[B.getBlockID()]) 1064 continue; 1065 if (B.size() == 0) { 1066 // A labeled empty statement, or the entry block... 1067 HasPlainEdge = true; 1068 continue; 1069 } 1070 Stmt *S = B[B.size()-1]; 1071 if (isa<ReturnStmt>(S)) { 1072 HasLiveReturn = true; 1073 continue; 1074 } 1075 if (isa<ObjCAtThrowStmt>(S)) { 1076 HasFakeEdge = true; 1077 continue; 1078 } 1079 if (isa<CXXThrowExpr>(S)) { 1080 HasFakeEdge = true; 1081 continue; 1082 } 1083 bool NoReturnEdge = false; 1084 if (CallExpr *C = dyn_cast<CallExpr>(S)) { 1085 Expr *CEE = C->getCallee()->IgnoreParenCasts(); 1086 if (CEE->getType().getNoReturnAttr()) { 1087 NoReturnEdge = true; 1088 HasFakeEdge = true; 1089 } else if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) { 1090 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(DRE->getDecl())) { 1091 if (FD->hasAttr<NoReturnAttr>()) { 1092 NoReturnEdge = true; 1093 HasFakeEdge = true; 1094 } 1095 } 1096 } 1097 } 1098 // FIXME: Add noreturn message sends. 1099 if (NoReturnEdge == false) 1100 HasPlainEdge = true; 1101 } 1102 if (!HasPlainEdge) 1103 return NeverFallThrough; 1104 if (HasFakeEdge || HasLiveReturn) 1105 return MaybeFallThrough; 1106 // This says AlwaysFallThrough for calls to functions that are not marked 1107 // noreturn, that don't return. If people would like this warning to be more 1108 // accurate, such functions should be marked as noreturn. 1109 return AlwaysFallThrough; 1110} 1111 1112/// CheckFallThroughForFunctionDef - Check that we don't fall off the end of a 1113/// function that should return a value. Check that we don't fall off the end 1114/// of a noreturn function. We assume that functions and blocks not marked 1115/// noreturn will return. 1116void Sema::CheckFallThroughForFunctionDef(Decl *D, Stmt *Body) { 1117 // FIXME: Would be nice if we had a better way to control cascading errors, 1118 // but for now, avoid them. The problem is that when Parse sees: 1119 // int foo() { return a; } 1120 // The return is eaten and the Sema code sees just: 1121 // int foo() { } 1122 // which this code would then warn about. 1123 if (getDiagnostics().hasErrorOccurred()) 1124 return; 1125 bool ReturnsVoid = false; 1126 bool HasNoReturn = false; 1127 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1128 // If the result type of the function is a dependent type, we don't know 1129 // whether it will be void or not, so don't 1130 if (FD->getResultType()->isDependentType()) 1131 return; 1132 if (FD->getResultType()->isVoidType()) 1133 ReturnsVoid = true; 1134 if (FD->hasAttr<NoReturnAttr>()) 1135 HasNoReturn = true; 1136 } else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) { 1137 if (MD->getResultType()->isVoidType()) 1138 ReturnsVoid = true; 1139 if (MD->hasAttr<NoReturnAttr>()) 1140 HasNoReturn = true; 1141 } 1142 1143 // Short circuit for compilation speed. 1144 if ((Diags.getDiagnosticLevel(diag::warn_maybe_falloff_nonvoid_function) 1145 == Diagnostic::Ignored || ReturnsVoid) 1146 && (Diags.getDiagnosticLevel(diag::warn_noreturn_function_has_return_expr) 1147 == Diagnostic::Ignored || !HasNoReturn) 1148 && (Diags.getDiagnosticLevel(diag::warn_suggest_noreturn_block) 1149 == Diagnostic::Ignored || !ReturnsVoid)) 1150 return; 1151 // FIXME: Function try block 1152 if (CompoundStmt *Compound = dyn_cast<CompoundStmt>(Body)) { 1153 switch (CheckFallThrough(Body)) { 1154 case MaybeFallThrough: 1155 if (HasNoReturn) 1156 Diag(Compound->getRBracLoc(), diag::warn_falloff_noreturn_function); 1157 else if (!ReturnsVoid) 1158 Diag(Compound->getRBracLoc(),diag::warn_maybe_falloff_nonvoid_function); 1159 break; 1160 case AlwaysFallThrough: 1161 if (HasNoReturn) 1162 Diag(Compound->getRBracLoc(), diag::warn_falloff_noreturn_function); 1163 else if (!ReturnsVoid) 1164 Diag(Compound->getRBracLoc(), diag::warn_falloff_nonvoid_function); 1165 break; 1166 case NeverFallThrough: 1167 if (ReturnsVoid) 1168 Diag(Compound->getLBracLoc(), diag::warn_suggest_noreturn_function); 1169 break; 1170 } 1171 } 1172} 1173 1174/// CheckFallThroughForBlock - Check that we don't fall off the end of a block 1175/// that should return a value. Check that we don't fall off the end of a 1176/// noreturn block. We assume that functions and blocks not marked noreturn 1177/// will return. 1178void Sema::CheckFallThroughForBlock(QualType BlockTy, Stmt *Body) { 1179 // FIXME: Would be nice if we had a better way to control cascading errors, 1180 // but for now, avoid them. The problem is that when Parse sees: 1181 // int foo() { return a; } 1182 // The return is eaten and the Sema code sees just: 1183 // int foo() { } 1184 // which this code would then warn about. 1185 if (getDiagnostics().hasErrorOccurred()) 1186 return; 1187 bool ReturnsVoid = false; 1188 bool HasNoReturn = false; 1189 if (const FunctionType *FT = BlockTy->getPointeeType()->getAs<FunctionType>()) { 1190 if (FT->getResultType()->isVoidType()) 1191 ReturnsVoid = true; 1192 if (FT->getNoReturnAttr()) 1193 HasNoReturn = true; 1194 } 1195 1196 // Short circuit for compilation speed. 1197 if (ReturnsVoid 1198 && !HasNoReturn 1199 && (Diags.getDiagnosticLevel(diag::warn_suggest_noreturn_block) 1200 == Diagnostic::Ignored || !ReturnsVoid)) 1201 return; 1202 // FIXME: Funtion try block 1203 if (CompoundStmt *Compound = dyn_cast<CompoundStmt>(Body)) { 1204 switch (CheckFallThrough(Body)) { 1205 case MaybeFallThrough: 1206 if (HasNoReturn) 1207 Diag(Compound->getRBracLoc(), diag::err_noreturn_block_has_return_expr); 1208 else if (!ReturnsVoid) 1209 Diag(Compound->getRBracLoc(), diag::err_maybe_falloff_nonvoid_block); 1210 break; 1211 case AlwaysFallThrough: 1212 if (HasNoReturn) 1213 Diag(Compound->getRBracLoc(), diag::err_noreturn_block_has_return_expr); 1214 else if (!ReturnsVoid) 1215 Diag(Compound->getRBracLoc(), diag::err_falloff_nonvoid_block); 1216 break; 1217 case NeverFallThrough: 1218 if (ReturnsVoid) 1219 Diag(Compound->getLBracLoc(), diag::warn_suggest_noreturn_block); 1220 break; 1221 } 1222 } 1223} 1224 1225/// CheckParmsForFunctionDef - Check that the parameters of the given 1226/// function are appropriate for the definition of a function. This 1227/// takes care of any checks that cannot be performed on the 1228/// declaration itself, e.g., that the types of each of the function 1229/// parameters are complete. 1230bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 1231 bool HasInvalidParm = false; 1232 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 1233 ParmVarDecl *Param = FD->getParamDecl(p); 1234 1235 // C99 6.7.5.3p4: the parameters in a parameter type list in a 1236 // function declarator that is part of a function definition of 1237 // that function shall not have incomplete type. 1238 // 1239 // This is also C++ [dcl.fct]p6. 1240 if (!Param->isInvalidDecl() && 1241 RequireCompleteType(Param->getLocation(), Param->getType(), 1242 diag::err_typecheck_decl_incomplete_type)) { 1243 Param->setInvalidDecl(); 1244 HasInvalidParm = true; 1245 } 1246 1247 // C99 6.9.1p5: If the declarator includes a parameter type list, the 1248 // declaration of each parameter shall include an identifier. 1249 if (Param->getIdentifier() == 0 && 1250 !Param->isImplicit() && 1251 !getLangOptions().CPlusPlus) 1252 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 1253 } 1254 1255 return HasInvalidParm; 1256} 1257 1258/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1259/// no declarator (e.g. "struct foo;") is parsed. 1260Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1261 // FIXME: Error on auto/register at file scope 1262 // FIXME: Error on inline/virtual/explicit 1263 // FIXME: Error on invalid restrict 1264 // FIXME: Warn on useless __thread 1265 // FIXME: Warn on useless const/volatile 1266 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1267 // FIXME: Warn on useless attributes 1268 Decl *TagD = 0; 1269 TagDecl *Tag = 0; 1270 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1271 DS.getTypeSpecType() == DeclSpec::TST_struct || 1272 DS.getTypeSpecType() == DeclSpec::TST_union || 1273 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1274 TagD = static_cast<Decl *>(DS.getTypeRep()); 1275 1276 if (!TagD) // We probably had an error 1277 return DeclPtrTy(); 1278 1279 // Note that the above type specs guarantee that the 1280 // type rep is a Decl, whereas in many of the others 1281 // it's a Type. 1282 Tag = dyn_cast<TagDecl>(TagD); 1283 } 1284 1285 if (DS.isFriendSpecified()) { 1286 // If we're dealing with a class template decl, assume that the 1287 // template routines are handling it. 1288 if (TagD && isa<ClassTemplateDecl>(TagD)) 1289 return DeclPtrTy(); 1290 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1291 } 1292 1293 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1294 if (!Record->getDeclName() && Record->isDefinition() && 1295 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1296 if (getLangOptions().CPlusPlus || 1297 Record->getDeclContext()->isRecord()) 1298 return BuildAnonymousStructOrUnion(S, DS, Record); 1299 1300 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1301 << DS.getSourceRange(); 1302 } 1303 1304 // Microsoft allows unnamed struct/union fields. Don't complain 1305 // about them. 1306 // FIXME: Should we support Microsoft's extensions in this area? 1307 if (Record->getDeclName() && getLangOptions().Microsoft) 1308 return DeclPtrTy::make(Tag); 1309 } 1310 1311 if (!DS.isMissingDeclaratorOk() && 1312 DS.getTypeSpecType() != DeclSpec::TST_error) { 1313 // Warn about typedefs of enums without names, since this is an 1314 // extension in both Microsoft an GNU. 1315 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1316 Tag && isa<EnumDecl>(Tag)) { 1317 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1318 << DS.getSourceRange(); 1319 return DeclPtrTy::make(Tag); 1320 } 1321 1322 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1323 << DS.getSourceRange(); 1324 return DeclPtrTy(); 1325 } 1326 1327 return DeclPtrTy::make(Tag); 1328} 1329 1330/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1331/// anonymous struct or union AnonRecord into the owning context Owner 1332/// and scope S. This routine will be invoked just after we realize 1333/// that an unnamed union or struct is actually an anonymous union or 1334/// struct, e.g., 1335/// 1336/// @code 1337/// union { 1338/// int i; 1339/// float f; 1340/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1341/// // f into the surrounding scope.x 1342/// @endcode 1343/// 1344/// This routine is recursive, injecting the names of nested anonymous 1345/// structs/unions into the owning context and scope as well. 1346bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1347 RecordDecl *AnonRecord) { 1348 bool Invalid = false; 1349 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1350 FEnd = AnonRecord->field_end(); 1351 F != FEnd; ++F) { 1352 if ((*F)->getDeclName()) { 1353 LookupResult R; 1354 LookupQualifiedName(R, Owner, (*F)->getDeclName(), 1355 LookupOrdinaryName, true); 1356 NamedDecl *PrevDecl = R.getAsSingleDecl(Context); 1357 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 1358 // C++ [class.union]p2: 1359 // The names of the members of an anonymous union shall be 1360 // distinct from the names of any other entity in the 1361 // scope in which the anonymous union is declared. 1362 unsigned diagKind 1363 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 1364 : diag::err_anonymous_struct_member_redecl; 1365 Diag((*F)->getLocation(), diagKind) 1366 << (*F)->getDeclName(); 1367 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1368 Invalid = true; 1369 } else { 1370 // C++ [class.union]p2: 1371 // For the purpose of name lookup, after the anonymous union 1372 // definition, the members of the anonymous union are 1373 // considered to have been defined in the scope in which the 1374 // anonymous union is declared. 1375 Owner->makeDeclVisibleInContext(*F); 1376 S->AddDecl(DeclPtrTy::make(*F)); 1377 IdResolver.AddDecl(*F); 1378 } 1379 } else if (const RecordType *InnerRecordType 1380 = (*F)->getType()->getAs<RecordType>()) { 1381 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1382 if (InnerRecord->isAnonymousStructOrUnion()) 1383 Invalid = Invalid || 1384 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1385 } 1386 } 1387 1388 return Invalid; 1389} 1390 1391/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1392/// anonymous structure or union. Anonymous unions are a C++ feature 1393/// (C++ [class.union]) and a GNU C extension; anonymous structures 1394/// are a GNU C and GNU C++ extension. 1395Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1396 RecordDecl *Record) { 1397 DeclContext *Owner = Record->getDeclContext(); 1398 1399 // Diagnose whether this anonymous struct/union is an extension. 1400 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1401 Diag(Record->getLocation(), diag::ext_anonymous_union); 1402 else if (!Record->isUnion()) 1403 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1404 1405 // C and C++ require different kinds of checks for anonymous 1406 // structs/unions. 1407 bool Invalid = false; 1408 if (getLangOptions().CPlusPlus) { 1409 const char* PrevSpec = 0; 1410 unsigned DiagID; 1411 // C++ [class.union]p3: 1412 // Anonymous unions declared in a named namespace or in the 1413 // global namespace shall be declared static. 1414 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1415 (isa<TranslationUnitDecl>(Owner) || 1416 (isa<NamespaceDecl>(Owner) && 1417 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1418 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1419 Invalid = true; 1420 1421 // Recover by adding 'static'. 1422 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1423 PrevSpec, DiagID); 1424 } 1425 // C++ [class.union]p3: 1426 // A storage class is not allowed in a declaration of an 1427 // anonymous union in a class scope. 1428 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1429 isa<RecordDecl>(Owner)) { 1430 Diag(DS.getStorageClassSpecLoc(), 1431 diag::err_anonymous_union_with_storage_spec); 1432 Invalid = true; 1433 1434 // Recover by removing the storage specifier. 1435 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1436 PrevSpec, DiagID); 1437 } 1438 1439 // C++ [class.union]p2: 1440 // The member-specification of an anonymous union shall only 1441 // define non-static data members. [Note: nested types and 1442 // functions cannot be declared within an anonymous union. ] 1443 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1444 MemEnd = Record->decls_end(); 1445 Mem != MemEnd; ++Mem) { 1446 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1447 // C++ [class.union]p3: 1448 // An anonymous union shall not have private or protected 1449 // members (clause 11). 1450 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1451 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1452 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1453 Invalid = true; 1454 } 1455 } else if ((*Mem)->isImplicit()) { 1456 // Any implicit members are fine. 1457 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1458 // This is a type that showed up in an 1459 // elaborated-type-specifier inside the anonymous struct or 1460 // union, but which actually declares a type outside of the 1461 // anonymous struct or union. It's okay. 1462 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1463 if (!MemRecord->isAnonymousStructOrUnion() && 1464 MemRecord->getDeclName()) { 1465 // This is a nested type declaration. 1466 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1467 << (int)Record->isUnion(); 1468 Invalid = true; 1469 } 1470 } else { 1471 // We have something that isn't a non-static data 1472 // member. Complain about it. 1473 unsigned DK = diag::err_anonymous_record_bad_member; 1474 if (isa<TypeDecl>(*Mem)) 1475 DK = diag::err_anonymous_record_with_type; 1476 else if (isa<FunctionDecl>(*Mem)) 1477 DK = diag::err_anonymous_record_with_function; 1478 else if (isa<VarDecl>(*Mem)) 1479 DK = diag::err_anonymous_record_with_static; 1480 Diag((*Mem)->getLocation(), DK) 1481 << (int)Record->isUnion(); 1482 Invalid = true; 1483 } 1484 } 1485 } 1486 1487 if (!Record->isUnion() && !Owner->isRecord()) { 1488 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1489 << (int)getLangOptions().CPlusPlus; 1490 Invalid = true; 1491 } 1492 1493 // Create a declaration for this anonymous struct/union. 1494 NamedDecl *Anon = 0; 1495 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1496 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1497 /*IdentifierInfo=*/0, 1498 Context.getTypeDeclType(Record), 1499 // FIXME: Type source info. 1500 /*DInfo=*/0, 1501 /*BitWidth=*/0, /*Mutable=*/false); 1502 Anon->setAccess(AS_public); 1503 if (getLangOptions().CPlusPlus) 1504 FieldCollector->Add(cast<FieldDecl>(Anon)); 1505 } else { 1506 VarDecl::StorageClass SC; 1507 switch (DS.getStorageClassSpec()) { 1508 default: assert(0 && "Unknown storage class!"); 1509 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1510 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1511 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1512 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1513 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1514 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1515 case DeclSpec::SCS_mutable: 1516 // mutable can only appear on non-static class members, so it's always 1517 // an error here 1518 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1519 Invalid = true; 1520 SC = VarDecl::None; 1521 break; 1522 } 1523 1524 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1525 /*IdentifierInfo=*/0, 1526 Context.getTypeDeclType(Record), 1527 // FIXME: Type source info. 1528 /*DInfo=*/0, 1529 SC); 1530 } 1531 Anon->setImplicit(); 1532 1533 // Add the anonymous struct/union object to the current 1534 // context. We'll be referencing this object when we refer to one of 1535 // its members. 1536 Owner->addDecl(Anon); 1537 1538 // Inject the members of the anonymous struct/union into the owning 1539 // context and into the identifier resolver chain for name lookup 1540 // purposes. 1541 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1542 Invalid = true; 1543 1544 // Mark this as an anonymous struct/union type. Note that we do not 1545 // do this until after we have already checked and injected the 1546 // members of this anonymous struct/union type, because otherwise 1547 // the members could be injected twice: once by DeclContext when it 1548 // builds its lookup table, and once by 1549 // InjectAnonymousStructOrUnionMembers. 1550 Record->setAnonymousStructOrUnion(true); 1551 1552 if (Invalid) 1553 Anon->setInvalidDecl(); 1554 1555 return DeclPtrTy::make(Anon); 1556} 1557 1558 1559/// GetNameForDeclarator - Determine the full declaration name for the 1560/// given Declarator. 1561DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1562 switch (D.getKind()) { 1563 case Declarator::DK_Abstract: 1564 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 1565 return DeclarationName(); 1566 1567 case Declarator::DK_Normal: 1568 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 1569 return DeclarationName(D.getIdentifier()); 1570 1571 case Declarator::DK_Constructor: { 1572 QualType Ty = GetTypeFromParser(D.getDeclaratorIdType()); 1573 return Context.DeclarationNames.getCXXConstructorName( 1574 Context.getCanonicalType(Ty)); 1575 } 1576 1577 case Declarator::DK_Destructor: { 1578 QualType Ty = GetTypeFromParser(D.getDeclaratorIdType()); 1579 return Context.DeclarationNames.getCXXDestructorName( 1580 Context.getCanonicalType(Ty)); 1581 } 1582 1583 case Declarator::DK_Conversion: { 1584 // FIXME: We'd like to keep the non-canonical type for diagnostics! 1585 QualType Ty = GetTypeFromParser(D.getDeclaratorIdType()); 1586 return Context.DeclarationNames.getCXXConversionFunctionName( 1587 Context.getCanonicalType(Ty)); 1588 } 1589 1590 case Declarator::DK_Operator: 1591 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 1592 return Context.DeclarationNames.getCXXOperatorName( 1593 D.getOverloadedOperator()); 1594 1595 case Declarator::DK_TemplateId: { 1596 TemplateName Name 1597 = TemplateName::getFromVoidPointer(D.getTemplateId()->Template); 1598 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 1599 return Template->getDeclName(); 1600 if (OverloadedFunctionDecl *Ovl = Name.getAsOverloadedFunctionDecl()) 1601 return Ovl->getDeclName(); 1602 1603 return DeclarationName(); 1604 } 1605 } 1606 1607 assert(false && "Unknown name kind"); 1608 return DeclarationName(); 1609} 1610 1611/// isNearlyMatchingFunction - Determine whether the C++ functions 1612/// Declaration and Definition are "nearly" matching. This heuristic 1613/// is used to improve diagnostics in the case where an out-of-line 1614/// function definition doesn't match any declaration within 1615/// the class or namespace. 1616static bool isNearlyMatchingFunction(ASTContext &Context, 1617 FunctionDecl *Declaration, 1618 FunctionDecl *Definition) { 1619 if (Declaration->param_size() != Definition->param_size()) 1620 return false; 1621 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1622 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1623 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1624 1625 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1626 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 1627 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1628 return false; 1629 } 1630 1631 return true; 1632} 1633 1634Sema::DeclPtrTy 1635Sema::HandleDeclarator(Scope *S, Declarator &D, 1636 MultiTemplateParamsArg TemplateParamLists, 1637 bool IsFunctionDefinition) { 1638 DeclarationName Name = GetNameForDeclarator(D); 1639 1640 // All of these full declarators require an identifier. If it doesn't have 1641 // one, the ParsedFreeStandingDeclSpec action should be used. 1642 if (!Name) { 1643 if (!D.isInvalidType()) // Reject this if we think it is valid. 1644 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1645 diag::err_declarator_need_ident) 1646 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1647 return DeclPtrTy(); 1648 } 1649 1650 // The scope passed in may not be a decl scope. Zip up the scope tree until 1651 // we find one that is. 1652 while ((S->getFlags() & Scope::DeclScope) == 0 || 1653 (S->getFlags() & Scope::TemplateParamScope) != 0) 1654 S = S->getParent(); 1655 1656 // If this is an out-of-line definition of a member of a class template 1657 // or class template partial specialization, we may need to rebuild the 1658 // type specifier in the declarator. See RebuildTypeInCurrentInstantiation() 1659 // for more information. 1660 // FIXME: cope with decltype(expr) and typeof(expr) once the rebuilder can 1661 // handle expressions properly. 1662 DeclSpec &DS = const_cast<DeclSpec&>(D.getDeclSpec()); 1663 if (D.getCXXScopeSpec().isSet() && !D.getCXXScopeSpec().isInvalid() && 1664 isDependentScopeSpecifier(D.getCXXScopeSpec()) && 1665 (DS.getTypeSpecType() == DeclSpec::TST_typename || 1666 DS.getTypeSpecType() == DeclSpec::TST_typeofType || 1667 DS.getTypeSpecType() == DeclSpec::TST_typeofExpr || 1668 DS.getTypeSpecType() == DeclSpec::TST_decltype)) { 1669 if (DeclContext *DC = computeDeclContext(D.getCXXScopeSpec(), true)) { 1670 // FIXME: Preserve type source info. 1671 QualType T = GetTypeFromParser(DS.getTypeRep()); 1672 EnterDeclaratorContext(S, DC); 1673 T = RebuildTypeInCurrentInstantiation(T, D.getIdentifierLoc(), Name); 1674 ExitDeclaratorContext(S); 1675 if (T.isNull()) 1676 return DeclPtrTy(); 1677 DS.UpdateTypeRep(T.getAsOpaquePtr()); 1678 } 1679 } 1680 1681 DeclContext *DC; 1682 NamedDecl *PrevDecl; 1683 NamedDecl *New; 1684 1685 DeclaratorInfo *DInfo = 0; 1686 QualType R = GetTypeForDeclarator(D, S, &DInfo); 1687 1688 // See if this is a redefinition of a variable in the same scope. 1689 if (D.getCXXScopeSpec().isInvalid()) { 1690 DC = CurContext; 1691 PrevDecl = 0; 1692 D.setInvalidType(); 1693 } else if (!D.getCXXScopeSpec().isSet()) { 1694 LookupNameKind NameKind = LookupOrdinaryName; 1695 1696 // If the declaration we're planning to build will be a function 1697 // or object with linkage, then look for another declaration with 1698 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1699 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1700 /* Do nothing*/; 1701 else if (R->isFunctionType()) { 1702 if (CurContext->isFunctionOrMethod() || 1703 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1704 NameKind = LookupRedeclarationWithLinkage; 1705 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1706 NameKind = LookupRedeclarationWithLinkage; 1707 else if (CurContext->getLookupContext()->isTranslationUnit() && 1708 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1709 NameKind = LookupRedeclarationWithLinkage; 1710 1711 DC = CurContext; 1712 LookupResult R; 1713 LookupName(R, S, Name, NameKind, true, 1714 NameKind == LookupRedeclarationWithLinkage, 1715 D.getIdentifierLoc()); 1716 PrevDecl = R.getAsSingleDecl(Context); 1717 } else { // Something like "int foo::x;" 1718 DC = computeDeclContext(D.getCXXScopeSpec(), true); 1719 1720 if (!DC) { 1721 // If we could not compute the declaration context, it's because the 1722 // declaration context is dependent but does not refer to a class, 1723 // class template, or class template partial specialization. Complain 1724 // and return early, to avoid the coming semantic disaster. 1725 Diag(D.getIdentifierLoc(), 1726 diag::err_template_qualified_declarator_no_match) 1727 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 1728 << D.getCXXScopeSpec().getRange(); 1729 return DeclPtrTy(); 1730 } 1731 1732 LookupResult Res; 1733 LookupQualifiedName(Res, DC, Name, LookupOrdinaryName, true); 1734 PrevDecl = Res.getAsSingleDecl(Context); 1735 1736 // C++ 7.3.1.2p2: 1737 // Members (including explicit specializations of templates) of a named 1738 // namespace can also be defined outside that namespace by explicit 1739 // qualification of the name being defined, provided that the entity being 1740 // defined was already declared in the namespace and the definition appears 1741 // after the point of declaration in a namespace that encloses the 1742 // declarations namespace. 1743 // 1744 // Note that we only check the context at this point. We don't yet 1745 // have enough information to make sure that PrevDecl is actually 1746 // the declaration we want to match. For example, given: 1747 // 1748 // class X { 1749 // void f(); 1750 // void f(float); 1751 // }; 1752 // 1753 // void X::f(int) { } // ill-formed 1754 // 1755 // In this case, PrevDecl will point to the overload set 1756 // containing the two f's declared in X, but neither of them 1757 // matches. 1758 1759 // First check whether we named the global scope. 1760 if (isa<TranslationUnitDecl>(DC)) { 1761 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1762 << Name << D.getCXXScopeSpec().getRange(); 1763 } else if (!CurContext->Encloses(DC)) { 1764 // The qualifying scope doesn't enclose the original declaration. 1765 // Emit diagnostic based on current scope. 1766 SourceLocation L = D.getIdentifierLoc(); 1767 SourceRange R = D.getCXXScopeSpec().getRange(); 1768 if (isa<FunctionDecl>(CurContext)) 1769 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1770 else 1771 Diag(L, diag::err_invalid_declarator_scope) 1772 << Name << cast<NamedDecl>(DC) << R; 1773 D.setInvalidType(); 1774 } 1775 } 1776 1777 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1778 // Maybe we will complain about the shadowed template parameter. 1779 if (!D.isInvalidType()) 1780 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl)) 1781 D.setInvalidType(); 1782 1783 // Just pretend that we didn't see the previous declaration. 1784 PrevDecl = 0; 1785 } 1786 1787 // In C++, the previous declaration we find might be a tag type 1788 // (class or enum). In this case, the new declaration will hide the 1789 // tag type. Note that this does does not apply if we're declaring a 1790 // typedef (C++ [dcl.typedef]p4). 1791 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 1792 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1793 PrevDecl = 0; 1794 1795 bool Redeclaration = false; 1796 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1797 if (TemplateParamLists.size()) { 1798 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 1799 return DeclPtrTy(); 1800 } 1801 1802 New = ActOnTypedefDeclarator(S, D, DC, R, DInfo, PrevDecl, Redeclaration); 1803 } else if (R->isFunctionType()) { 1804 New = ActOnFunctionDeclarator(S, D, DC, R, DInfo, PrevDecl, 1805 move(TemplateParamLists), 1806 IsFunctionDefinition, Redeclaration); 1807 } else { 1808 New = ActOnVariableDeclarator(S, D, DC, R, DInfo, PrevDecl, 1809 move(TemplateParamLists), 1810 Redeclaration); 1811 } 1812 1813 if (New == 0) 1814 return DeclPtrTy(); 1815 1816 // If this has an identifier and is not an invalid redeclaration or 1817 // function template specialization, add it to the scope stack. 1818 if (Name && !(Redeclaration && New->isInvalidDecl()) && 1819 !(isa<FunctionDecl>(New) && 1820 cast<FunctionDecl>(New)->isFunctionTemplateSpecialization())) 1821 PushOnScopeChains(New, S); 1822 1823 return DeclPtrTy::make(New); 1824} 1825 1826/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 1827/// types into constant array types in certain situations which would otherwise 1828/// be errors (for GCC compatibility). 1829static QualType TryToFixInvalidVariablyModifiedType(QualType T, 1830 ASTContext &Context, 1831 bool &SizeIsNegative) { 1832 // This method tries to turn a variable array into a constant 1833 // array even when the size isn't an ICE. This is necessary 1834 // for compatibility with code that depends on gcc's buggy 1835 // constant expression folding, like struct {char x[(int)(char*)2];} 1836 SizeIsNegative = false; 1837 1838 QualifierCollector Qs; 1839 const Type *Ty = Qs.strip(T); 1840 1841 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 1842 QualType Pointee = PTy->getPointeeType(); 1843 QualType FixedType = 1844 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 1845 if (FixedType.isNull()) return FixedType; 1846 FixedType = Context.getPointerType(FixedType); 1847 return Qs.apply(FixedType); 1848 } 1849 1850 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 1851 if (!VLATy) 1852 return QualType(); 1853 // FIXME: We should probably handle this case 1854 if (VLATy->getElementType()->isVariablyModifiedType()) 1855 return QualType(); 1856 1857 Expr::EvalResult EvalResult; 1858 if (!VLATy->getSizeExpr() || 1859 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 1860 !EvalResult.Val.isInt()) 1861 return QualType(); 1862 1863 llvm::APSInt &Res = EvalResult.Val.getInt(); 1864 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 1865 Expr* ArySizeExpr = VLATy->getSizeExpr(); 1866 // FIXME: here we could "steal" (how?) ArySizeExpr from the VLA, 1867 // so as to transfer ownership to the ConstantArrayWithExpr. 1868 // Alternatively, we could "clone" it (how?). 1869 // Since we don't know how to do things above, we just use the 1870 // very same Expr*. 1871 return Context.getConstantArrayWithExprType(VLATy->getElementType(), 1872 Res, ArySizeExpr, 1873 ArrayType::Normal, 0, 1874 VLATy->getBracketsRange()); 1875 } 1876 1877 SizeIsNegative = true; 1878 return QualType(); 1879} 1880 1881/// \brief Register the given locally-scoped external C declaration so 1882/// that it can be found later for redeclarations 1883void 1884Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, NamedDecl *PrevDecl, 1885 Scope *S) { 1886 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 1887 "Decl is not a locally-scoped decl!"); 1888 // Note that we have a locally-scoped external with this name. 1889 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 1890 1891 if (!PrevDecl) 1892 return; 1893 1894 // If there was a previous declaration of this variable, it may be 1895 // in our identifier chain. Update the identifier chain with the new 1896 // declaration. 1897 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 1898 // The previous declaration was found on the identifer resolver 1899 // chain, so remove it from its scope. 1900 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 1901 S = S->getParent(); 1902 1903 if (S) 1904 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 1905 } 1906} 1907 1908/// \brief Diagnose function specifiers on a declaration of an identifier that 1909/// does not identify a function. 1910void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 1911 // FIXME: We should probably indicate the identifier in question to avoid 1912 // confusion for constructs like "inline int a(), b;" 1913 if (D.getDeclSpec().isInlineSpecified()) 1914 Diag(D.getDeclSpec().getInlineSpecLoc(), 1915 diag::err_inline_non_function); 1916 1917 if (D.getDeclSpec().isVirtualSpecified()) 1918 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1919 diag::err_virtual_non_function); 1920 1921 if (D.getDeclSpec().isExplicitSpecified()) 1922 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1923 diag::err_explicit_non_function); 1924} 1925 1926NamedDecl* 1927Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1928 QualType R, DeclaratorInfo *DInfo, 1929 NamedDecl* PrevDecl, bool &Redeclaration) { 1930 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1931 if (D.getCXXScopeSpec().isSet()) { 1932 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1933 << D.getCXXScopeSpec().getRange(); 1934 D.setInvalidType(); 1935 // Pretend we didn't see the scope specifier. 1936 DC = 0; 1937 } 1938 1939 if (getLangOptions().CPlusPlus) { 1940 // Check that there are no default arguments (C++ only). 1941 CheckExtraCXXDefaultArguments(D); 1942 } 1943 1944 DiagnoseFunctionSpecifiers(D); 1945 1946 if (D.getDeclSpec().isThreadSpecified()) 1947 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 1948 1949 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R); 1950 if (!NewTD) return 0; 1951 1952 if (D.isInvalidType()) 1953 NewTD->setInvalidDecl(); 1954 1955 // Handle attributes prior to checking for duplicates in MergeVarDecl 1956 ProcessDeclAttributes(S, NewTD, D); 1957 // Merge the decl with the existing one if appropriate. If the decl is 1958 // in an outer scope, it isn't the same thing. 1959 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1960 Redeclaration = true; 1961 MergeTypeDefDecl(NewTD, PrevDecl); 1962 } 1963 1964 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1965 // then it shall have block scope. 1966 QualType T = NewTD->getUnderlyingType(); 1967 if (T->isVariablyModifiedType()) { 1968 CurFunctionNeedsScopeChecking = true; 1969 1970 if (S->getFnParent() == 0) { 1971 bool SizeIsNegative; 1972 QualType FixedTy = 1973 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1974 if (!FixedTy.isNull()) { 1975 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 1976 NewTD->setUnderlyingType(FixedTy); 1977 } else { 1978 if (SizeIsNegative) 1979 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 1980 else if (T->isVariableArrayType()) 1981 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1982 else 1983 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1984 NewTD->setInvalidDecl(); 1985 } 1986 } 1987 } 1988 1989 // If this is the C FILE type, notify the AST context. 1990 if (IdentifierInfo *II = NewTD->getIdentifier()) 1991 if (!NewTD->isInvalidDecl() && 1992 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 1993 if (II->isStr("FILE")) 1994 Context.setFILEDecl(NewTD); 1995 else if (II->isStr("jmp_buf")) 1996 Context.setjmp_bufDecl(NewTD); 1997 else if (II->isStr("sigjmp_buf")) 1998 Context.setsigjmp_bufDecl(NewTD); 1999 } 2000 2001 return NewTD; 2002} 2003 2004/// \brief Determines whether the given declaration is an out-of-scope 2005/// previous declaration. 2006/// 2007/// This routine should be invoked when name lookup has found a 2008/// previous declaration (PrevDecl) that is not in the scope where a 2009/// new declaration by the same name is being introduced. If the new 2010/// declaration occurs in a local scope, previous declarations with 2011/// linkage may still be considered previous declarations (C99 2012/// 6.2.2p4-5, C++ [basic.link]p6). 2013/// 2014/// \param PrevDecl the previous declaration found by name 2015/// lookup 2016/// 2017/// \param DC the context in which the new declaration is being 2018/// declared. 2019/// 2020/// \returns true if PrevDecl is an out-of-scope previous declaration 2021/// for a new delcaration with the same name. 2022static bool 2023isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2024 ASTContext &Context) { 2025 if (!PrevDecl) 2026 return 0; 2027 2028 // FIXME: PrevDecl could be an OverloadedFunctionDecl, in which 2029 // case we need to check each of the overloaded functions. 2030 if (!PrevDecl->hasLinkage()) 2031 return false; 2032 2033 if (Context.getLangOptions().CPlusPlus) { 2034 // C++ [basic.link]p6: 2035 // If there is a visible declaration of an entity with linkage 2036 // having the same name and type, ignoring entities declared 2037 // outside the innermost enclosing namespace scope, the block 2038 // scope declaration declares that same entity and receives the 2039 // linkage of the previous declaration. 2040 DeclContext *OuterContext = DC->getLookupContext(); 2041 if (!OuterContext->isFunctionOrMethod()) 2042 // This rule only applies to block-scope declarations. 2043 return false; 2044 else { 2045 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2046 if (PrevOuterContext->isRecord()) 2047 // We found a member function: ignore it. 2048 return false; 2049 else { 2050 // Find the innermost enclosing namespace for the new and 2051 // previous declarations. 2052 while (!OuterContext->isFileContext()) 2053 OuterContext = OuterContext->getParent(); 2054 while (!PrevOuterContext->isFileContext()) 2055 PrevOuterContext = PrevOuterContext->getParent(); 2056 2057 // The previous declaration is in a different namespace, so it 2058 // isn't the same function. 2059 if (OuterContext->getPrimaryContext() != 2060 PrevOuterContext->getPrimaryContext()) 2061 return false; 2062 } 2063 } 2064 } 2065 2066 return true; 2067} 2068 2069NamedDecl* 2070Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2071 QualType R, DeclaratorInfo *DInfo, 2072 NamedDecl* PrevDecl, 2073 MultiTemplateParamsArg TemplateParamLists, 2074 bool &Redeclaration) { 2075 DeclarationName Name = GetNameForDeclarator(D); 2076 2077 // Check that there are no default arguments (C++ only). 2078 if (getLangOptions().CPlusPlus) 2079 CheckExtraCXXDefaultArguments(D); 2080 2081 VarDecl *NewVD; 2082 VarDecl::StorageClass SC; 2083 switch (D.getDeclSpec().getStorageClassSpec()) { 2084 default: assert(0 && "Unknown storage class!"); 2085 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 2086 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 2087 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 2088 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 2089 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 2090 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 2091 case DeclSpec::SCS_mutable: 2092 // mutable can only appear on non-static class members, so it's always 2093 // an error here 2094 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2095 D.setInvalidType(); 2096 SC = VarDecl::None; 2097 break; 2098 } 2099 2100 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2101 if (!II) { 2102 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2103 << Name.getAsString(); 2104 return 0; 2105 } 2106 2107 DiagnoseFunctionSpecifiers(D); 2108 2109 if (!DC->isRecord() && S->getFnParent() == 0) { 2110 // C99 6.9p2: The storage-class specifiers auto and register shall not 2111 // appear in the declaration specifiers in an external declaration. 2112 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2113 2114 // If this is a register variable with an asm label specified, then this 2115 // is a GNU extension. 2116 if (SC == VarDecl::Register && D.getAsmLabel()) 2117 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2118 else 2119 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2120 D.setInvalidType(); 2121 } 2122 } 2123 if (DC->isRecord() && !CurContext->isRecord()) { 2124 // This is an out-of-line definition of a static data member. 2125 if (SC == VarDecl::Static) { 2126 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2127 diag::err_static_out_of_line) 2128 << CodeModificationHint::CreateRemoval( 2129 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 2130 } else if (SC == VarDecl::None) 2131 SC = VarDecl::Static; 2132 } 2133 if (SC == VarDecl::Static) { 2134 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2135 if (RD->isLocalClass()) 2136 Diag(D.getIdentifierLoc(), 2137 diag::err_static_data_member_not_allowed_in_local_class) 2138 << Name << RD->getDeclName(); 2139 } 2140 } 2141 2142 // Match up the template parameter lists with the scope specifier, then 2143 // determine whether we have a template or a template specialization. 2144 bool isExplicitSpecialization = false; 2145 if (TemplateParameterList *TemplateParams 2146 = MatchTemplateParametersToScopeSpecifier( 2147 D.getDeclSpec().getSourceRange().getBegin(), 2148 D.getCXXScopeSpec(), 2149 (TemplateParameterList**)TemplateParamLists.get(), 2150 TemplateParamLists.size(), 2151 isExplicitSpecialization)) { 2152 if (TemplateParams->size() > 0) { 2153 // There is no such thing as a variable template. 2154 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2155 << II 2156 << SourceRange(TemplateParams->getTemplateLoc(), 2157 TemplateParams->getRAngleLoc()); 2158 return 0; 2159 } else { 2160 // There is an extraneous 'template<>' for this variable. Complain 2161 // about it, but allow the declaration of the variable. 2162 Diag(TemplateParams->getTemplateLoc(), 2163 diag::err_template_variable_noparams) 2164 << II 2165 << SourceRange(TemplateParams->getTemplateLoc(), 2166 TemplateParams->getRAngleLoc()); 2167 2168 isExplicitSpecialization = true; 2169 } 2170 } 2171 2172 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2173 II, R, DInfo, SC); 2174 2175 if (D.isInvalidType()) 2176 NewVD->setInvalidDecl(); 2177 2178 if (D.getDeclSpec().isThreadSpecified()) { 2179 if (NewVD->hasLocalStorage()) 2180 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2181 else if (!Context.Target.isTLSSupported()) 2182 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2183 else 2184 NewVD->setThreadSpecified(true); 2185 } 2186 2187 // Set the lexical context. If the declarator has a C++ scope specifier, the 2188 // lexical context will be different from the semantic context. 2189 NewVD->setLexicalDeclContext(CurContext); 2190 2191 // Handle attributes prior to checking for duplicates in MergeVarDecl 2192 ProcessDeclAttributes(S, NewVD, D); 2193 2194 // Handle GNU asm-label extension (encoded as an attribute). 2195 if (Expr *E = (Expr*) D.getAsmLabel()) { 2196 // The parser guarantees this is a string. 2197 StringLiteral *SE = cast<StringLiteral>(E); 2198 NewVD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 2199 SE->getByteLength()))); 2200 } 2201 2202 // If name lookup finds a previous declaration that is not in the 2203 // same scope as the new declaration, this may still be an 2204 // acceptable redeclaration. 2205 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 2206 !(NewVD->hasLinkage() && 2207 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 2208 PrevDecl = 0; 2209 2210 // Merge the decl with the existing one if appropriate. 2211 if (PrevDecl) { 2212 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 2213 // The user tried to define a non-static data member 2214 // out-of-line (C++ [dcl.meaning]p1). 2215 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2216 << D.getCXXScopeSpec().getRange(); 2217 PrevDecl = 0; 2218 NewVD->setInvalidDecl(); 2219 } 2220 } else if (D.getCXXScopeSpec().isSet()) { 2221 // No previous declaration in the qualifying scope. 2222 NestedNameSpecifier *NNS = 2223 (NestedNameSpecifier *)D.getCXXScopeSpec().getScopeRep(); 2224 DiagnoseMissingMember(D.getIdentifierLoc(), Name, NNS, 2225 D.getCXXScopeSpec().getRange()); 2226 NewVD->setInvalidDecl(); 2227 } 2228 2229 CheckVariableDeclaration(NewVD, PrevDecl, Redeclaration); 2230 2231 // This is an explicit specialization of a static data member. Check it. 2232 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2233 CheckMemberSpecialization(NewVD, PrevDecl)) 2234 NewVD->setInvalidDecl(); 2235 2236 // attributes declared post-definition are currently ignored 2237 if (PrevDecl) { 2238 const VarDecl *Def = 0, *PrevVD = dyn_cast<VarDecl>(PrevDecl); 2239 if (PrevVD->getDefinition(Def) && D.hasAttributes()) { 2240 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2241 Diag(Def->getLocation(), diag::note_previous_definition); 2242 } 2243 } 2244 2245 // If this is a locally-scoped extern C variable, update the map of 2246 // such variables. 2247 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2248 !NewVD->isInvalidDecl()) 2249 RegisterLocallyScopedExternCDecl(NewVD, PrevDecl, S); 2250 2251 return NewVD; 2252} 2253 2254/// \brief Perform semantic checking on a newly-created variable 2255/// declaration. 2256/// 2257/// This routine performs all of the type-checking required for a 2258/// variable declaration once it has been built. It is used both to 2259/// check variables after they have been parsed and their declarators 2260/// have been translated into a declaration, and to check variables 2261/// that have been instantiated from a template. 2262/// 2263/// Sets NewVD->isInvalidDecl() if an error was encountered. 2264void Sema::CheckVariableDeclaration(VarDecl *NewVD, NamedDecl *PrevDecl, 2265 bool &Redeclaration) { 2266 // If the decl is already known invalid, don't check it. 2267 if (NewVD->isInvalidDecl()) 2268 return; 2269 2270 QualType T = NewVD->getType(); 2271 2272 if (T->isObjCInterfaceType()) { 2273 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2274 return NewVD->setInvalidDecl(); 2275 } 2276 2277 // The variable can not have an abstract class type. 2278 if (RequireNonAbstractType(NewVD->getLocation(), T, 2279 diag::err_abstract_type_in_decl, 2280 AbstractVariableType)) 2281 return NewVD->setInvalidDecl(); 2282 2283 // Emit an error if an address space was applied to decl with local storage. 2284 // This includes arrays of objects with address space qualifiers, but not 2285 // automatic variables that point to other address spaces. 2286 // ISO/IEC TR 18037 S5.1.2 2287 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2288 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2289 return NewVD->setInvalidDecl(); 2290 } 2291 2292 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2293 && !NewVD->hasAttr<BlocksAttr>()) 2294 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2295 2296 bool isVM = T->isVariablyModifiedType(); 2297 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2298 NewVD->hasAttr<BlocksAttr>()) 2299 CurFunctionNeedsScopeChecking = true; 2300 2301 if ((isVM && NewVD->hasLinkage()) || 2302 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2303 bool SizeIsNegative; 2304 QualType FixedTy = 2305 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2306 2307 if (FixedTy.isNull() && T->isVariableArrayType()) { 2308 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2309 // FIXME: This won't give the correct result for 2310 // int a[10][n]; 2311 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2312 2313 if (NewVD->isFileVarDecl()) 2314 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2315 << SizeRange; 2316 else if (NewVD->getStorageClass() == VarDecl::Static) 2317 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2318 << SizeRange; 2319 else 2320 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2321 << SizeRange; 2322 return NewVD->setInvalidDecl(); 2323 } 2324 2325 if (FixedTy.isNull()) { 2326 if (NewVD->isFileVarDecl()) 2327 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2328 else 2329 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2330 return NewVD->setInvalidDecl(); 2331 } 2332 2333 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2334 NewVD->setType(FixedTy); 2335 } 2336 2337 if (!PrevDecl && NewVD->isExternC()) { 2338 // Since we did not find anything by this name and we're declaring 2339 // an extern "C" variable, look for a non-visible extern "C" 2340 // declaration with the same name. 2341 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2342 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2343 if (Pos != LocallyScopedExternalDecls.end()) 2344 PrevDecl = Pos->second; 2345 } 2346 2347 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2348 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2349 << T; 2350 return NewVD->setInvalidDecl(); 2351 } 2352 2353 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2354 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2355 return NewVD->setInvalidDecl(); 2356 } 2357 2358 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2359 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2360 return NewVD->setInvalidDecl(); 2361 } 2362 2363 if (PrevDecl) { 2364 Redeclaration = true; 2365 MergeVarDecl(NewVD, PrevDecl); 2366 } 2367} 2368 2369static bool isUsingDecl(Decl *D) { 2370 return isa<UsingDecl>(D) || isa<UnresolvedUsingDecl>(D); 2371} 2372 2373/// \brief Data used with FindOverriddenMethod 2374struct FindOverriddenMethodData { 2375 Sema *S; 2376 CXXMethodDecl *Method; 2377}; 2378 2379/// \brief Member lookup function that determines whether a given C++ 2380/// method overrides a method in a base class, to be used with 2381/// CXXRecordDecl::lookupInBases(). 2382static bool FindOverriddenMethod(CXXBaseSpecifier *Specifier, 2383 CXXBasePath &Path, 2384 void *UserData) { 2385 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2386 2387 FindOverriddenMethodData *Data 2388 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 2389 for (Path.Decls = BaseRecord->lookup(Data->Method->getDeclName()); 2390 Path.Decls.first != Path.Decls.second; 2391 ++Path.Decls.first) { 2392 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*Path.Decls.first)) { 2393 OverloadedFunctionDecl::function_iterator MatchedDecl; 2394 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, MatchedDecl)) 2395 return true; 2396 } 2397 } 2398 2399 return false; 2400} 2401 2402NamedDecl* 2403Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2404 QualType R, DeclaratorInfo *DInfo, 2405 NamedDecl* PrevDecl, 2406 MultiTemplateParamsArg TemplateParamLists, 2407 bool IsFunctionDefinition, bool &Redeclaration) { 2408 assert(R.getTypePtr()->isFunctionType()); 2409 2410 DeclarationName Name = GetNameForDeclarator(D); 2411 FunctionDecl::StorageClass SC = FunctionDecl::None; 2412 switch (D.getDeclSpec().getStorageClassSpec()) { 2413 default: assert(0 && "Unknown storage class!"); 2414 case DeclSpec::SCS_auto: 2415 case DeclSpec::SCS_register: 2416 case DeclSpec::SCS_mutable: 2417 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2418 diag::err_typecheck_sclass_func); 2419 D.setInvalidType(); 2420 break; 2421 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2422 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2423 case DeclSpec::SCS_static: { 2424 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2425 // C99 6.7.1p5: 2426 // The declaration of an identifier for a function that has 2427 // block scope shall have no explicit storage-class specifier 2428 // other than extern 2429 // See also (C++ [dcl.stc]p4). 2430 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2431 diag::err_static_block_func); 2432 SC = FunctionDecl::None; 2433 } else 2434 SC = FunctionDecl::Static; 2435 break; 2436 } 2437 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2438 } 2439 2440 if (D.getDeclSpec().isThreadSpecified()) 2441 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2442 2443 bool isFriend = D.getDeclSpec().isFriendSpecified(); 2444 bool isInline = D.getDeclSpec().isInlineSpecified(); 2445 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2446 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2447 2448 // Check that the return type is not an abstract class type. 2449 // For record types, this is done by the AbstractClassUsageDiagnoser once 2450 // the class has been completely parsed. 2451 if (!DC->isRecord() && 2452 RequireNonAbstractType(D.getIdentifierLoc(), 2453 R->getAs<FunctionType>()->getResultType(), 2454 diag::err_abstract_type_in_decl, 2455 AbstractReturnType)) 2456 D.setInvalidType(); 2457 2458 // Do not allow returning a objc interface by-value. 2459 if (R->getAs<FunctionType>()->getResultType()->isObjCInterfaceType()) { 2460 Diag(D.getIdentifierLoc(), 2461 diag::err_object_cannot_be_passed_returned_by_value) << 0 2462 << R->getAs<FunctionType>()->getResultType(); 2463 D.setInvalidType(); 2464 } 2465 2466 bool isVirtualOkay = false; 2467 FunctionDecl *NewFD; 2468 2469 if (isFriend) { 2470 // DC is the namespace in which the function is being declared. 2471 assert((DC->isFileContext() || PrevDecl) && "previously-undeclared " 2472 "friend function being created in a non-namespace context"); 2473 2474 // C++ [class.friend]p5 2475 // A function can be defined in a friend declaration of a 2476 // class . . . . Such a function is implicitly inline. 2477 isInline |= IsFunctionDefinition; 2478 } 2479 2480 if (D.getKind() == Declarator::DK_Constructor) { 2481 // This is a C++ constructor declaration. 2482 assert(DC->isRecord() && 2483 "Constructors can only be declared in a member context"); 2484 2485 R = CheckConstructorDeclarator(D, R, SC); 2486 2487 // Create the new declaration 2488 NewFD = CXXConstructorDecl::Create(Context, 2489 cast<CXXRecordDecl>(DC), 2490 D.getIdentifierLoc(), Name, R, DInfo, 2491 isExplicit, isInline, 2492 /*isImplicitlyDeclared=*/false); 2493 } else if (D.getKind() == Declarator::DK_Destructor) { 2494 // This is a C++ destructor declaration. 2495 if (DC->isRecord()) { 2496 R = CheckDestructorDeclarator(D, SC); 2497 2498 NewFD = CXXDestructorDecl::Create(Context, 2499 cast<CXXRecordDecl>(DC), 2500 D.getIdentifierLoc(), Name, R, 2501 isInline, 2502 /*isImplicitlyDeclared=*/false); 2503 2504 isVirtualOkay = true; 2505 } else { 2506 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2507 2508 // Create a FunctionDecl to satisfy the function definition parsing 2509 // code path. 2510 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2511 Name, R, DInfo, SC, isInline, 2512 /*hasPrototype=*/true); 2513 D.setInvalidType(); 2514 } 2515 } else if (D.getKind() == Declarator::DK_Conversion) { 2516 if (!DC->isRecord()) { 2517 Diag(D.getIdentifierLoc(), 2518 diag::err_conv_function_not_member); 2519 return 0; 2520 } 2521 2522 CheckConversionDeclarator(D, R, SC); 2523 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2524 D.getIdentifierLoc(), Name, R, DInfo, 2525 isInline, isExplicit); 2526 2527 isVirtualOkay = true; 2528 } else if (DC->isRecord()) { 2529 // If the of the function is the same as the name of the record, then this 2530 // must be an invalid constructor that has a return type. 2531 // (The parser checks for a return type and makes the declarator a 2532 // constructor if it has no return type). 2533 // must have an invalid constructor that has a return type 2534 if (Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2535 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2536 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2537 << SourceRange(D.getIdentifierLoc()); 2538 return 0; 2539 } 2540 2541 // This is a C++ method declaration. 2542 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2543 D.getIdentifierLoc(), Name, R, DInfo, 2544 (SC == FunctionDecl::Static), isInline); 2545 2546 isVirtualOkay = (SC != FunctionDecl::Static); 2547 } else { 2548 // Determine whether the function was written with a 2549 // prototype. This true when: 2550 // - we're in C++ (where every function has a prototype), 2551 // - there is a prototype in the declarator, or 2552 // - the type R of the function is some kind of typedef or other reference 2553 // to a type name (which eventually refers to a function type). 2554 bool HasPrototype = 2555 getLangOptions().CPlusPlus || 2556 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2557 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2558 2559 NewFD = FunctionDecl::Create(Context, DC, 2560 D.getIdentifierLoc(), 2561 Name, R, DInfo, SC, isInline, HasPrototype); 2562 } 2563 2564 if (D.isInvalidType()) 2565 NewFD->setInvalidDecl(); 2566 2567 // Set the lexical context. If the declarator has a C++ 2568 // scope specifier, or is the object of a friend declaration, the 2569 // lexical context will be different from the semantic context. 2570 NewFD->setLexicalDeclContext(CurContext); 2571 2572 if (isFriend) 2573 NewFD->setObjectOfFriendDecl(/* PreviouslyDeclared= */ PrevDecl != NULL); 2574 2575 // Match up the template parameter lists with the scope specifier, then 2576 // determine whether we have a template or a template specialization. 2577 FunctionTemplateDecl *FunctionTemplate = 0; 2578 bool isExplicitSpecialization = false; 2579 bool isFunctionTemplateSpecialization = false; 2580 if (TemplateParameterList *TemplateParams 2581 = MatchTemplateParametersToScopeSpecifier( 2582 D.getDeclSpec().getSourceRange().getBegin(), 2583 D.getCXXScopeSpec(), 2584 (TemplateParameterList**)TemplateParamLists.get(), 2585 TemplateParamLists.size(), 2586 isExplicitSpecialization)) { 2587 if (TemplateParams->size() > 0) { 2588 // This is a function template 2589 2590 // Check that we can declare a template here. 2591 if (CheckTemplateDeclScope(S, TemplateParams)) 2592 return 0; 2593 2594 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 2595 NewFD->getLocation(), 2596 Name, TemplateParams, 2597 NewFD); 2598 FunctionTemplate->setLexicalDeclContext(CurContext); 2599 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 2600 } else { 2601 // This is a function template specialization. 2602 isFunctionTemplateSpecialization = true; 2603 } 2604 2605 // FIXME: Free this memory properly. 2606 TemplateParamLists.release(); 2607 } 2608 2609 // C++ [dcl.fct.spec]p5: 2610 // The virtual specifier shall only be used in declarations of 2611 // nonstatic class member functions that appear within a 2612 // member-specification of a class declaration; see 10.3. 2613 // 2614 if (isVirtual && !NewFD->isInvalidDecl()) { 2615 if (!isVirtualOkay) { 2616 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2617 diag::err_virtual_non_function); 2618 } else if (!CurContext->isRecord()) { 2619 // 'virtual' was specified outside of the class. 2620 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2621 << CodeModificationHint::CreateRemoval( 2622 SourceRange(D.getDeclSpec().getVirtualSpecLoc())); 2623 } else { 2624 // Okay: Add virtual to the method. 2625 cast<CXXMethodDecl>(NewFD)->setVirtualAsWritten(true); 2626 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2627 CurClass->setAggregate(false); 2628 CurClass->setPOD(false); 2629 CurClass->setEmpty(false); 2630 CurClass->setPolymorphic(true); 2631 CurClass->setHasTrivialConstructor(false); 2632 CurClass->setHasTrivialCopyConstructor(false); 2633 CurClass->setHasTrivialCopyAssignment(false); 2634 } 2635 } 2636 2637 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) { 2638 // Look for virtual methods in base classes that this method might override. 2639 CXXBasePaths Paths; 2640 FindOverriddenMethodData Data; 2641 Data.Method = NewMD; 2642 Data.S = this; 2643 if (cast<CXXRecordDecl>(DC)->lookupInBases(&FindOverriddenMethod, &Data, 2644 Paths)) { 2645 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 2646 E = Paths.found_decls_end(); I != E; ++I) { 2647 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2648 if (!CheckOverridingFunctionReturnType(NewMD, OldMD) && 2649 !CheckOverridingFunctionExceptionSpec(NewMD, OldMD)) 2650 NewMD->addOverriddenMethod(OldMD); 2651 } 2652 } 2653 } 2654 } 2655 2656 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 2657 !CurContext->isRecord()) { 2658 // C++ [class.static]p1: 2659 // A data or function member of a class may be declared static 2660 // in a class definition, in which case it is a static member of 2661 // the class. 2662 2663 // Complain about the 'static' specifier if it's on an out-of-line 2664 // member function definition. 2665 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2666 diag::err_static_out_of_line) 2667 << CodeModificationHint::CreateRemoval( 2668 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 2669 } 2670 2671 // Handle GNU asm-label extension (encoded as an attribute). 2672 if (Expr *E = (Expr*) D.getAsmLabel()) { 2673 // The parser guarantees this is a string. 2674 StringLiteral *SE = cast<StringLiteral>(E); 2675 NewFD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 2676 SE->getByteLength()))); 2677 } 2678 2679 // Copy the parameter declarations from the declarator D to the function 2680 // declaration NewFD, if they are available. First scavenge them into Params. 2681 llvm::SmallVector<ParmVarDecl*, 16> Params; 2682 if (D.getNumTypeObjects() > 0) { 2683 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2684 2685 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 2686 // function that takes no arguments, not a function that takes a 2687 // single void argument. 2688 // We let through "const void" here because Sema::GetTypeForDeclarator 2689 // already checks for that case. 2690 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2691 FTI.ArgInfo[0].Param && 2692 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 2693 // Empty arg list, don't push any params. 2694 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 2695 2696 // In C++, the empty parameter-type-list must be spelled "void"; a 2697 // typedef of void is not permitted. 2698 if (getLangOptions().CPlusPlus && 2699 Param->getType().getUnqualifiedType() != Context.VoidTy) 2700 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 2701 // FIXME: Leaks decl? 2702 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 2703 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2704 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 2705 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 2706 Param->setDeclContext(NewFD); 2707 Params.push_back(Param); 2708 } 2709 } 2710 2711 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 2712 // When we're declaring a function with a typedef, typeof, etc as in the 2713 // following example, we'll need to synthesize (unnamed) 2714 // parameters for use in the declaration. 2715 // 2716 // @code 2717 // typedef void fn(int); 2718 // fn f; 2719 // @endcode 2720 2721 // Synthesize a parameter for each argument type. 2722 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 2723 AE = FT->arg_type_end(); AI != AE; ++AI) { 2724 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, 2725 SourceLocation(), 0, 2726 *AI, /*DInfo=*/0, 2727 VarDecl::None, 0); 2728 Param->setImplicit(); 2729 Params.push_back(Param); 2730 } 2731 } else { 2732 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 2733 "Should not need args for typedef of non-prototype fn"); 2734 } 2735 // Finally, we know we have the right number of parameters, install them. 2736 NewFD->setParams(Context, Params.data(), Params.size()); 2737 2738 // If name lookup finds a previous declaration that is not in the 2739 // same scope as the new declaration, this may still be an 2740 // acceptable redeclaration. 2741 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 2742 !(NewFD->hasLinkage() && 2743 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 2744 PrevDecl = 0; 2745 2746 // If the declarator is a template-id, translate the parser's template 2747 // argument list into our AST format. 2748 bool HasExplicitTemplateArgs = false; 2749 llvm::SmallVector<TemplateArgument, 16> TemplateArgs; 2750 SourceLocation LAngleLoc, RAngleLoc; 2751 if (D.getKind() == Declarator::DK_TemplateId) { 2752 TemplateIdAnnotation *TemplateId = D.getTemplateId(); 2753 ASTTemplateArgsPtr TemplateArgsPtr(*this, 2754 TemplateId->getTemplateArgs(), 2755 TemplateId->getTemplateArgIsType(), 2756 TemplateId->NumArgs); 2757 translateTemplateArguments(TemplateArgsPtr, 2758 TemplateId->getTemplateArgLocations(), 2759 TemplateArgs); 2760 TemplateArgsPtr.release(); 2761 2762 HasExplicitTemplateArgs = true; 2763 LAngleLoc = TemplateId->LAngleLoc; 2764 RAngleLoc = TemplateId->RAngleLoc; 2765 2766 if (FunctionTemplate) { 2767 // FIXME: Diagnose function template with explicit template 2768 // arguments. 2769 HasExplicitTemplateArgs = false; 2770 } else if (!isFunctionTemplateSpecialization && 2771 !D.getDeclSpec().isFriendSpecified()) { 2772 // We have encountered something that the user meant to be a 2773 // specialization (because it has explicitly-specified template 2774 // arguments) but that was not introduced with a "template<>" (or had 2775 // too few of them). 2776 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 2777 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 2778 << CodeModificationHint::CreateInsertion( 2779 D.getDeclSpec().getSourceRange().getBegin(), 2780 "template<> "); 2781 isFunctionTemplateSpecialization = true; 2782 } 2783 } 2784 2785 if (isFunctionTemplateSpecialization) { 2786 if (CheckFunctionTemplateSpecialization(NewFD, HasExplicitTemplateArgs, 2787 LAngleLoc, TemplateArgs.data(), 2788 TemplateArgs.size(), RAngleLoc, 2789 PrevDecl)) 2790 NewFD->setInvalidDecl(); 2791 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD) && 2792 CheckMemberSpecialization(NewFD, PrevDecl)) 2793 NewFD->setInvalidDecl(); 2794 2795 // Perform semantic checking on the function declaration. 2796 bool OverloadableAttrRequired = false; // FIXME: HACK! 2797 CheckFunctionDeclaration(NewFD, PrevDecl, Redeclaration, 2798 /*FIXME:*/OverloadableAttrRequired); 2799 2800 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 2801 // An out-of-line member function declaration must also be a 2802 // definition (C++ [dcl.meaning]p1). 2803 // Note that this is not the case for explicit specializations of 2804 // function templates or member functions of class templates, per 2805 // C++ [temp.expl.spec]p2. 2806 if (!IsFunctionDefinition && !isFriend && 2807 NewFD->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) { 2808 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2809 << D.getCXXScopeSpec().getRange(); 2810 NewFD->setInvalidDecl(); 2811 } else if (!Redeclaration && (!PrevDecl || !isUsingDecl(PrevDecl))) { 2812 // The user tried to provide an out-of-line definition for a 2813 // function that is a member of a class or namespace, but there 2814 // was no such member function declared (C++ [class.mfct]p2, 2815 // C++ [namespace.memdef]p2). For example: 2816 // 2817 // class X { 2818 // void f() const; 2819 // }; 2820 // 2821 // void X::f() { } // ill-formed 2822 // 2823 // Complain about this problem, and attempt to suggest close 2824 // matches (e.g., those that differ only in cv-qualifiers and 2825 // whether the parameter types are references). 2826 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 2827 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 2828 NewFD->setInvalidDecl(); 2829 2830 LookupResult Prev; 2831 LookupQualifiedName(Prev, DC, Name, LookupOrdinaryName, true); 2832 assert(!Prev.isAmbiguous() && 2833 "Cannot have an ambiguity in previous-declaration lookup"); 2834 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 2835 Func != FuncEnd; ++Func) { 2836 if (isa<FunctionDecl>(*Func) && 2837 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 2838 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 2839 } 2840 2841 PrevDecl = 0; 2842 } 2843 } 2844 2845 // Handle attributes. We need to have merged decls when handling attributes 2846 // (for example to check for conflicts, etc). 2847 // FIXME: This needs to happen before we merge declarations. Then, 2848 // let attribute merging cope with attribute conflicts. 2849 ProcessDeclAttributes(S, NewFD, D); 2850 2851 // attributes declared post-definition are currently ignored 2852 if (Redeclaration && PrevDecl) { 2853 const FunctionDecl *Def, *PrevFD = dyn_cast<FunctionDecl>(PrevDecl); 2854 if (PrevFD && PrevFD->getBody(Def) && D.hasAttributes()) { 2855 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 2856 Diag(Def->getLocation(), diag::note_previous_definition); 2857 } 2858 } 2859 2860 AddKnownFunctionAttributes(NewFD); 2861 2862 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 2863 // If a function name is overloadable in C, then every function 2864 // with that name must be marked "overloadable". 2865 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 2866 << Redeclaration << NewFD; 2867 if (PrevDecl) 2868 Diag(PrevDecl->getLocation(), 2869 diag::note_attribute_overloadable_prev_overload); 2870 NewFD->addAttr(::new (Context) OverloadableAttr()); 2871 } 2872 2873 // If this is a locally-scoped extern C function, update the 2874 // map of such names. 2875 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 2876 && !NewFD->isInvalidDecl()) 2877 RegisterLocallyScopedExternCDecl(NewFD, PrevDecl, S); 2878 2879 // Set this FunctionDecl's range up to the right paren. 2880 NewFD->setLocEnd(D.getSourceRange().getEnd()); 2881 2882 if (FunctionTemplate && NewFD->isInvalidDecl()) 2883 FunctionTemplate->setInvalidDecl(); 2884 2885 if (FunctionTemplate) 2886 return FunctionTemplate; 2887 2888 return NewFD; 2889} 2890 2891/// \brief Perform semantic checking of a new function declaration. 2892/// 2893/// Performs semantic analysis of the new function declaration 2894/// NewFD. This routine performs all semantic checking that does not 2895/// require the actual declarator involved in the declaration, and is 2896/// used both for the declaration of functions as they are parsed 2897/// (called via ActOnDeclarator) and for the declaration of functions 2898/// that have been instantiated via C++ template instantiation (called 2899/// via InstantiateDecl). 2900/// 2901/// This sets NewFD->isInvalidDecl() to true if there was an error. 2902void Sema::CheckFunctionDeclaration(FunctionDecl *NewFD, NamedDecl *&PrevDecl, 2903 bool &Redeclaration, 2904 bool &OverloadableAttrRequired) { 2905 // If NewFD is already known erroneous, don't do any of this checking. 2906 if (NewFD->isInvalidDecl()) 2907 return; 2908 2909 if (NewFD->getResultType()->isVariablyModifiedType()) { 2910 // Functions returning a variably modified type violate C99 6.7.5.2p2 2911 // because all functions have linkage. 2912 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 2913 return NewFD->setInvalidDecl(); 2914 } 2915 2916 if (NewFD->isMain()) 2917 CheckMain(NewFD); 2918 2919 // Check for a previous declaration of this name. 2920 if (!PrevDecl && NewFD->isExternC()) { 2921 // Since we did not find anything by this name and we're declaring 2922 // an extern "C" function, look for a non-visible extern "C" 2923 // declaration with the same name. 2924 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2925 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 2926 if (Pos != LocallyScopedExternalDecls.end()) 2927 PrevDecl = Pos->second; 2928 } 2929 2930 // Merge or overload the declaration with an existing declaration of 2931 // the same name, if appropriate. 2932 if (PrevDecl) { 2933 // Determine whether NewFD is an overload of PrevDecl or 2934 // a declaration that requires merging. If it's an overload, 2935 // there's no more work to do here; we'll just add the new 2936 // function to the scope. 2937 OverloadedFunctionDecl::function_iterator MatchedDecl; 2938 2939 if (!getLangOptions().CPlusPlus && 2940 AllowOverloadingOfFunction(PrevDecl, Context)) { 2941 OverloadableAttrRequired = true; 2942 2943 // Functions marked "overloadable" must have a prototype (that 2944 // we can't get through declaration merging). 2945 if (!NewFD->getType()->getAs<FunctionProtoType>()) { 2946 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_no_prototype) 2947 << NewFD; 2948 Redeclaration = true; 2949 2950 // Turn this into a variadic function with no parameters. 2951 QualType R = Context.getFunctionType( 2952 NewFD->getType()->getAs<FunctionType>()->getResultType(), 2953 0, 0, true, 0); 2954 NewFD->setType(R); 2955 return NewFD->setInvalidDecl(); 2956 } 2957 } 2958 2959 if (PrevDecl && 2960 (!AllowOverloadingOfFunction(PrevDecl, Context) || 2961 !IsOverload(NewFD, PrevDecl, MatchedDecl)) && !isUsingDecl(PrevDecl)) { 2962 Redeclaration = true; 2963 Decl *OldDecl = PrevDecl; 2964 2965 // If PrevDecl was an overloaded function, extract the 2966 // FunctionDecl that matched. 2967 if (isa<OverloadedFunctionDecl>(PrevDecl)) 2968 OldDecl = *MatchedDecl; 2969 2970 // NewFD and OldDecl represent declarations that need to be 2971 // merged. 2972 if (MergeFunctionDecl(NewFD, OldDecl)) 2973 return NewFD->setInvalidDecl(); 2974 2975 if (FunctionTemplateDecl *OldTemplateDecl 2976 = dyn_cast<FunctionTemplateDecl>(OldDecl)) 2977 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 2978 else { 2979 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 2980 NewFD->setAccess(OldDecl->getAccess()); 2981 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 2982 } 2983 } 2984 } 2985 2986 // Semantic checking for this function declaration (in isolation). 2987 if (getLangOptions().CPlusPlus) { 2988 // C++-specific checks. 2989 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 2990 CheckConstructor(Constructor); 2991 } else if (isa<CXXDestructorDecl>(NewFD)) { 2992 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 2993 QualType ClassType = Context.getTypeDeclType(Record); 2994 if (!ClassType->isDependentType()) { 2995 DeclarationName Name 2996 = Context.DeclarationNames.getCXXDestructorName( 2997 Context.getCanonicalType(ClassType)); 2998 if (NewFD->getDeclName() != Name) { 2999 Diag(NewFD->getLocation(), diag::err_destructor_name); 3000 return NewFD->setInvalidDecl(); 3001 } 3002 } 3003 Record->setUserDeclaredDestructor(true); 3004 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3005 // user-defined destructor. 3006 Record->setPOD(false); 3007 3008 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3009 // declared destructor. 3010 // FIXME: C++0x: don't do this for "= default" destructors 3011 Record->setHasTrivialDestructor(false); 3012 } else if (CXXConversionDecl *Conversion 3013 = dyn_cast<CXXConversionDecl>(NewFD)) 3014 ActOnConversionDeclarator(Conversion); 3015 3016 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3017 if (NewFD->isOverloadedOperator() && 3018 CheckOverloadedOperatorDeclaration(NewFD)) 3019 return NewFD->setInvalidDecl(); 3020 3021 // In C++, check default arguments now that we have merged decls. Unless 3022 // the lexical context is the class, because in this case this is done 3023 // during delayed parsing anyway. 3024 if (!CurContext->isRecord()) 3025 CheckCXXDefaultArguments(NewFD); 3026 } 3027} 3028 3029void Sema::CheckMain(FunctionDecl* FD) { 3030 // C++ [basic.start.main]p3: A program that declares main to be inline 3031 // or static is ill-formed. 3032 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3033 // shall not appear in a declaration of main. 3034 // static main is not an error under C99, but we should warn about it. 3035 bool isInline = FD->isInline(); 3036 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3037 if (isInline || isStatic) { 3038 unsigned diagID = diag::warn_unusual_main_decl; 3039 if (isInline || getLangOptions().CPlusPlus) 3040 diagID = diag::err_unusual_main_decl; 3041 3042 int which = isStatic + (isInline << 1) - 1; 3043 Diag(FD->getLocation(), diagID) << which; 3044 } 3045 3046 QualType T = FD->getType(); 3047 assert(T->isFunctionType() && "function decl is not of function type"); 3048 const FunctionType* FT = T->getAs<FunctionType>(); 3049 3050 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3051 // TODO: add a replacement fixit to turn the return type into 'int'. 3052 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3053 FD->setInvalidDecl(true); 3054 } 3055 3056 // Treat protoless main() as nullary. 3057 if (isa<FunctionNoProtoType>(FT)) return; 3058 3059 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3060 unsigned nparams = FTP->getNumArgs(); 3061 assert(FD->getNumParams() == nparams); 3062 3063 if (nparams > 3) { 3064 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 3065 FD->setInvalidDecl(true); 3066 nparams = 3; 3067 } 3068 3069 // FIXME: a lot of the following diagnostics would be improved 3070 // if we had some location information about types. 3071 3072 QualType CharPP = 3073 Context.getPointerType(Context.getPointerType(Context.CharTy)); 3074 QualType Expected[] = { Context.IntTy, CharPP, CharPP }; 3075 3076 for (unsigned i = 0; i < nparams; ++i) { 3077 QualType AT = FTP->getArgType(i); 3078 3079 bool mismatch = true; 3080 3081 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 3082 mismatch = false; 3083 else if (Expected[i] == CharPP) { 3084 // As an extension, the following forms are okay: 3085 // char const ** 3086 // char const * const * 3087 // char * const * 3088 3089 QualifierCollector qs; 3090 const PointerType* PT; 3091 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 3092 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 3093 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 3094 qs.removeConst(); 3095 mismatch = !qs.empty(); 3096 } 3097 } 3098 3099 if (mismatch) { 3100 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 3101 // TODO: suggest replacing given type with expected type 3102 FD->setInvalidDecl(true); 3103 } 3104 } 3105 3106 if (nparams == 1 && !FD->isInvalidDecl()) { 3107 Diag(FD->getLocation(), diag::warn_main_one_arg); 3108 } 3109} 3110 3111bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 3112 // FIXME: Need strict checking. In C89, we need to check for 3113 // any assignment, increment, decrement, function-calls, or 3114 // commas outside of a sizeof. In C99, it's the same list, 3115 // except that the aforementioned are allowed in unevaluated 3116 // expressions. Everything else falls under the 3117 // "may accept other forms of constant expressions" exception. 3118 // (We never end up here for C++, so the constant expression 3119 // rules there don't matter.) 3120 if (Init->isConstantInitializer(Context)) 3121 return false; 3122 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 3123 << Init->getSourceRange(); 3124 return true; 3125} 3126 3127void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 3128 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 3129} 3130 3131/// AddInitializerToDecl - Adds the initializer Init to the 3132/// declaration dcl. If DirectInit is true, this is C++ direct 3133/// initialization rather than copy initialization. 3134void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 3135 Decl *RealDecl = dcl.getAs<Decl>(); 3136 // If there is no declaration, there was an error parsing it. Just ignore 3137 // the initializer. 3138 if (RealDecl == 0) 3139 return; 3140 3141 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 3142 // With declarators parsed the way they are, the parser cannot 3143 // distinguish between a normal initializer and a pure-specifier. 3144 // Thus this grotesque test. 3145 IntegerLiteral *IL; 3146 Expr *Init = static_cast<Expr *>(init.get()); 3147 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 3148 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 3149 if (Method->isVirtualAsWritten()) { 3150 Method->setPure(); 3151 3152 // A class is abstract if at least one function is pure virtual. 3153 cast<CXXRecordDecl>(CurContext)->setAbstract(true); 3154 } else if (!Method->isInvalidDecl()) { 3155 Diag(Method->getLocation(), diag::err_non_virtual_pure) 3156 << Method->getDeclName() << Init->getSourceRange(); 3157 Method->setInvalidDecl(); 3158 } 3159 } else { 3160 Diag(Method->getLocation(), diag::err_member_function_initialization) 3161 << Method->getDeclName() << Init->getSourceRange(); 3162 Method->setInvalidDecl(); 3163 } 3164 return; 3165 } 3166 3167 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3168 if (!VDecl) { 3169 if (getLangOptions().CPlusPlus && 3170 RealDecl->getLexicalDeclContext()->isRecord() && 3171 isa<NamedDecl>(RealDecl)) 3172 Diag(RealDecl->getLocation(), diag::err_member_initialization) 3173 << cast<NamedDecl>(RealDecl)->getDeclName(); 3174 else 3175 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3176 RealDecl->setInvalidDecl(); 3177 return; 3178 } 3179 3180 if (!VDecl->getType()->isArrayType() && 3181 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 3182 diag::err_typecheck_decl_incomplete_type)) { 3183 RealDecl->setInvalidDecl(); 3184 return; 3185 } 3186 3187 const VarDecl *Def = 0; 3188 if (VDecl->getDefinition(Def)) { 3189 Diag(VDecl->getLocation(), diag::err_redefinition) 3190 << VDecl->getDeclName(); 3191 Diag(Def->getLocation(), diag::note_previous_definition); 3192 VDecl->setInvalidDecl(); 3193 return; 3194 } 3195 3196 // Take ownership of the expression, now that we're sure we have somewhere 3197 // to put it. 3198 Expr *Init = init.takeAs<Expr>(); 3199 assert(Init && "missing initializer"); 3200 3201 // Get the decls type and save a reference for later, since 3202 // CheckInitializerTypes may change it. 3203 QualType DclT = VDecl->getType(), SavT = DclT; 3204 if (VDecl->isBlockVarDecl()) { 3205 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 3206 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 3207 VDecl->setInvalidDecl(); 3208 } else if (!VDecl->isInvalidDecl()) { 3209 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 3210 VDecl->getDeclName(), DirectInit)) 3211 VDecl->setInvalidDecl(); 3212 3213 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3214 // Don't check invalid declarations to avoid emitting useless diagnostics. 3215 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3216 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 3217 CheckForConstantInitializer(Init, DclT); 3218 } 3219 } 3220 } else if (VDecl->isStaticDataMember() && 3221 VDecl->getLexicalDeclContext()->isRecord()) { 3222 // This is an in-class initialization for a static data member, e.g., 3223 // 3224 // struct S { 3225 // static const int value = 17; 3226 // }; 3227 3228 // Attach the initializer 3229 VDecl->setInit(Context, Init); 3230 3231 // C++ [class.mem]p4: 3232 // A member-declarator can contain a constant-initializer only 3233 // if it declares a static member (9.4) of const integral or 3234 // const enumeration type, see 9.4.2. 3235 QualType T = VDecl->getType(); 3236 if (!T->isDependentType() && 3237 (!Context.getCanonicalType(T).isConstQualified() || 3238 !T->isIntegralType())) { 3239 Diag(VDecl->getLocation(), diag::err_member_initialization) 3240 << VDecl->getDeclName() << Init->getSourceRange(); 3241 VDecl->setInvalidDecl(); 3242 } else { 3243 // C++ [class.static.data]p4: 3244 // If a static data member is of const integral or const 3245 // enumeration type, its declaration in the class definition 3246 // can specify a constant-initializer which shall be an 3247 // integral constant expression (5.19). 3248 if (!Init->isTypeDependent() && 3249 !Init->getType()->isIntegralType()) { 3250 // We have a non-dependent, non-integral or enumeration type. 3251 Diag(Init->getSourceRange().getBegin(), 3252 diag::err_in_class_initializer_non_integral_type) 3253 << Init->getType() << Init->getSourceRange(); 3254 VDecl->setInvalidDecl(); 3255 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 3256 // Check whether the expression is a constant expression. 3257 llvm::APSInt Value; 3258 SourceLocation Loc; 3259 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 3260 Diag(Loc, diag::err_in_class_initializer_non_constant) 3261 << Init->getSourceRange(); 3262 VDecl->setInvalidDecl(); 3263 } else if (!VDecl->getType()->isDependentType()) 3264 ImpCastExprToType(Init, VDecl->getType()); 3265 } 3266 } 3267 } else if (VDecl->isFileVarDecl()) { 3268 if (VDecl->getStorageClass() == VarDecl::Extern) 3269 Diag(VDecl->getLocation(), diag::warn_extern_init); 3270 if (!VDecl->isInvalidDecl()) 3271 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 3272 VDecl->getDeclName(), DirectInit)) 3273 VDecl->setInvalidDecl(); 3274 3275 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3276 // Don't check invalid declarations to avoid emitting useless diagnostics. 3277 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3278 // C99 6.7.8p4. All file scoped initializers need to be constant. 3279 CheckForConstantInitializer(Init, DclT); 3280 } 3281 } 3282 // If the type changed, it means we had an incomplete type that was 3283 // completed by the initializer. For example: 3284 // int ary[] = { 1, 3, 5 }; 3285 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 3286 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 3287 VDecl->setType(DclT); 3288 Init->setType(DclT); 3289 } 3290 3291 Init = MaybeCreateCXXExprWithTemporaries(Init, 3292 /*ShouldDestroyTemporaries=*/true); 3293 // Attach the initializer to the decl. 3294 VDecl->setInit(Context, Init); 3295 3296 // If the previous declaration of VDecl was a tentative definition, 3297 // remove it from the set of tentative definitions. 3298 if (VDecl->getPreviousDeclaration() && 3299 VDecl->getPreviousDeclaration()->isTentativeDefinition(Context)) { 3300 bool Deleted = TentativeDefinitions.erase(VDecl->getDeclName()); 3301 assert(Deleted && "Unrecorded tentative definition?"); Deleted=Deleted; 3302 } 3303 3304 return; 3305} 3306 3307void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 3308 bool TypeContainsUndeducedAuto) { 3309 Decl *RealDecl = dcl.getAs<Decl>(); 3310 3311 // If there is no declaration, there was an error parsing it. Just ignore it. 3312 if (RealDecl == 0) 3313 return; 3314 3315 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 3316 QualType Type = Var->getType(); 3317 3318 // Record tentative definitions. 3319 if (Var->isTentativeDefinition(Context)) { 3320 std::pair<llvm::DenseMap<DeclarationName, VarDecl *>::iterator, bool> 3321 InsertPair = 3322 TentativeDefinitions.insert(std::make_pair(Var->getDeclName(), Var)); 3323 3324 // Keep the latest definition in the map. If we see 'int i; int i;' we 3325 // want the second one in the map. 3326 InsertPair.first->second = Var; 3327 3328 // However, for the list, we don't care about the order, just make sure 3329 // that there are no dupes for a given declaration name. 3330 if (InsertPair.second) 3331 TentativeDefinitionList.push_back(Var->getDeclName()); 3332 } 3333 3334 // C++ [dcl.init.ref]p3: 3335 // The initializer can be omitted for a reference only in a 3336 // parameter declaration (8.3.5), in the declaration of a 3337 // function return type, in the declaration of a class member 3338 // within its class declaration (9.2), and where the extern 3339 // specifier is explicitly used. 3340 if (Type->isReferenceType() && !Var->hasExternalStorage()) { 3341 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 3342 << Var->getDeclName() 3343 << SourceRange(Var->getLocation(), Var->getLocation()); 3344 Var->setInvalidDecl(); 3345 return; 3346 } 3347 3348 // C++0x [dcl.spec.auto]p3 3349 if (TypeContainsUndeducedAuto) { 3350 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 3351 << Var->getDeclName() << Type; 3352 Var->setInvalidDecl(); 3353 return; 3354 } 3355 3356 // C++ [temp.expl.spec]p15: 3357 // An explicit specialization of a static data member of a template is a 3358 // definition if the declaration includes an initializer; otherwise, it 3359 // is a declaration. 3360 if (Var->isStaticDataMember() && 3361 Var->getInstantiatedFromStaticDataMember() && 3362 Var->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) 3363 return; 3364 3365 // C++ [dcl.init]p9: 3366 // If no initializer is specified for an object, and the object 3367 // is of (possibly cv-qualified) non-POD class type (or array 3368 // thereof), the object shall be default-initialized; if the 3369 // object is of const-qualified type, the underlying class type 3370 // shall have a user-declared default constructor. 3371 // 3372 // FIXME: Diagnose the "user-declared default constructor" bit. 3373 if (getLangOptions().CPlusPlus) { 3374 QualType InitType = Type; 3375 if (const ArrayType *Array = Context.getAsArrayType(Type)) 3376 InitType = Array->getElementType(); 3377 if ((!Var->hasExternalStorage() && !Var->isExternC()) && 3378 InitType->isRecordType() && !InitType->isDependentType()) { 3379 if (!RequireCompleteType(Var->getLocation(), InitType, 3380 diag::err_invalid_incomplete_type_use)) { 3381 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 3382 3383 CXXConstructorDecl *Constructor 3384 = PerformInitializationByConstructor(InitType, 3385 MultiExprArg(*this, 0, 0), 3386 Var->getLocation(), 3387 SourceRange(Var->getLocation(), 3388 Var->getLocation()), 3389 Var->getDeclName(), 3390 IK_Default, 3391 ConstructorArgs); 3392 3393 // FIXME: Location info for the variable initialization? 3394 if (!Constructor) 3395 Var->setInvalidDecl(); 3396 else { 3397 // FIXME: Cope with initialization of arrays 3398 if (!Constructor->isTrivial() && 3399 InitializeVarWithConstructor(Var, Constructor, InitType, 3400 move_arg(ConstructorArgs))) 3401 Var->setInvalidDecl(); 3402 3403 FinalizeVarWithDestructor(Var, InitType); 3404 } 3405 } else { 3406 Var->setInvalidDecl(); 3407 } 3408 } 3409 } 3410 3411#if 0 3412 // FIXME: Temporarily disabled because we are not properly parsing 3413 // linkage specifications on declarations, e.g., 3414 // 3415 // extern "C" const CGPoint CGPointerZero; 3416 // 3417 // C++ [dcl.init]p9: 3418 // 3419 // If no initializer is specified for an object, and the 3420 // object is of (possibly cv-qualified) non-POD class type (or 3421 // array thereof), the object shall be default-initialized; if 3422 // the object is of const-qualified type, the underlying class 3423 // type shall have a user-declared default 3424 // constructor. Otherwise, if no initializer is specified for 3425 // an object, the object and its subobjects, if any, have an 3426 // indeterminate initial value; if the object or any of its 3427 // subobjects are of const-qualified type, the program is 3428 // ill-formed. 3429 // 3430 // This isn't technically an error in C, so we don't diagnose it. 3431 // 3432 // FIXME: Actually perform the POD/user-defined default 3433 // constructor check. 3434 if (getLangOptions().CPlusPlus && 3435 Context.getCanonicalType(Type).isConstQualified() && 3436 !Var->hasExternalStorage()) 3437 Diag(Var->getLocation(), diag::err_const_var_requires_init) 3438 << Var->getName() 3439 << SourceRange(Var->getLocation(), Var->getLocation()); 3440#endif 3441 } 3442} 3443 3444Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 3445 DeclPtrTy *Group, 3446 unsigned NumDecls) { 3447 llvm::SmallVector<Decl*, 8> Decls; 3448 3449 if (DS.isTypeSpecOwned()) 3450 Decls.push_back((Decl*)DS.getTypeRep()); 3451 3452 for (unsigned i = 0; i != NumDecls; ++i) 3453 if (Decl *D = Group[i].getAs<Decl>()) 3454 Decls.push_back(D); 3455 3456 // Perform semantic analysis that depends on having fully processed both 3457 // the declarator and initializer. 3458 for (unsigned i = 0, e = Decls.size(); i != e; ++i) { 3459 VarDecl *IDecl = dyn_cast<VarDecl>(Decls[i]); 3460 if (!IDecl) 3461 continue; 3462 QualType T = IDecl->getType(); 3463 3464 // Block scope. C99 6.7p7: If an identifier for an object is declared with 3465 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 3466 if (IDecl->isBlockVarDecl() && !IDecl->hasExternalStorage()) { 3467 if (!IDecl->isInvalidDecl() && 3468 RequireCompleteType(IDecl->getLocation(), T, 3469 diag::err_typecheck_decl_incomplete_type)) 3470 IDecl->setInvalidDecl(); 3471 } 3472 // File scope. C99 6.9.2p2: A declaration of an identifier for an 3473 // object that has file scope without an initializer, and without a 3474 // storage-class specifier or with the storage-class specifier "static", 3475 // constitutes a tentative definition. Note: A tentative definition with 3476 // external linkage is valid (C99 6.2.2p5). 3477 if (IDecl->isTentativeDefinition(Context) && !IDecl->isInvalidDecl()) { 3478 if (const IncompleteArrayType *ArrayT 3479 = Context.getAsIncompleteArrayType(T)) { 3480 if (RequireCompleteType(IDecl->getLocation(), 3481 ArrayT->getElementType(), 3482 diag::err_illegal_decl_array_incomplete_type)) 3483 IDecl->setInvalidDecl(); 3484 } else if (IDecl->getStorageClass() == VarDecl::Static) { 3485 // C99 6.9.2p3: If the declaration of an identifier for an object is 3486 // a tentative definition and has internal linkage (C99 6.2.2p3), the 3487 // declared type shall not be an incomplete type. 3488 // NOTE: code such as the following 3489 // static struct s; 3490 // struct s { int a; }; 3491 // is accepted by gcc. Hence here we issue a warning instead of 3492 // an error and we do not invalidate the static declaration. 3493 // NOTE: to avoid multiple warnings, only check the first declaration. 3494 if (IDecl->getPreviousDeclaration() == 0) 3495 RequireCompleteType(IDecl->getLocation(), T, 3496 diag::ext_typecheck_decl_incomplete_type); 3497 } 3498 } 3499 } 3500 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 3501 Decls.data(), Decls.size())); 3502} 3503 3504 3505/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 3506/// to introduce parameters into function prototype scope. 3507Sema::DeclPtrTy 3508Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 3509 const DeclSpec &DS = D.getDeclSpec(); 3510 3511 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 3512 VarDecl::StorageClass StorageClass = VarDecl::None; 3513 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 3514 StorageClass = VarDecl::Register; 3515 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 3516 Diag(DS.getStorageClassSpecLoc(), 3517 diag::err_invalid_storage_class_in_func_decl); 3518 D.getMutableDeclSpec().ClearStorageClassSpecs(); 3519 } 3520 3521 if (D.getDeclSpec().isThreadSpecified()) 3522 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3523 3524 DiagnoseFunctionSpecifiers(D); 3525 3526 // Check that there are no default arguments inside the type of this 3527 // parameter (C++ only). 3528 if (getLangOptions().CPlusPlus) 3529 CheckExtraCXXDefaultArguments(D); 3530 3531 DeclaratorInfo *DInfo = 0; 3532 TagDecl *OwnedDecl = 0; 3533 QualType parmDeclType = GetTypeForDeclarator(D, S, &DInfo, /*Skip=*/0, 3534 &OwnedDecl); 3535 3536 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 3537 // C++ [dcl.fct]p6: 3538 // Types shall not be defined in return or parameter types. 3539 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 3540 << Context.getTypeDeclType(OwnedDecl); 3541 } 3542 3543 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 3544 // Can this happen for params? We already checked that they don't conflict 3545 // among each other. Here they can only shadow globals, which is ok. 3546 IdentifierInfo *II = D.getIdentifier(); 3547 if (II) { 3548 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 3549 if (PrevDecl->isTemplateParameter()) { 3550 // Maybe we will complain about the shadowed template parameter. 3551 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3552 // Just pretend that we didn't see the previous declaration. 3553 PrevDecl = 0; 3554 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 3555 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 3556 3557 // Recover by removing the name 3558 II = 0; 3559 D.SetIdentifier(0, D.getIdentifierLoc()); 3560 } 3561 } 3562 } 3563 3564 // Parameters can not be abstract class types. 3565 // For record types, this is done by the AbstractClassUsageDiagnoser once 3566 // the class has been completely parsed. 3567 if (!CurContext->isRecord() && 3568 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 3569 diag::err_abstract_type_in_decl, 3570 AbstractParamType)) 3571 D.setInvalidType(true); 3572 3573 QualType T = adjustParameterType(parmDeclType); 3574 3575 ParmVarDecl *New; 3576 if (T == parmDeclType) // parameter type did not need adjustment 3577 New = ParmVarDecl::Create(Context, CurContext, 3578 D.getIdentifierLoc(), II, 3579 parmDeclType, DInfo, StorageClass, 3580 0); 3581 else // keep track of both the adjusted and unadjusted types 3582 New = OriginalParmVarDecl::Create(Context, CurContext, 3583 D.getIdentifierLoc(), II, T, DInfo, 3584 parmDeclType, StorageClass, 0); 3585 3586 if (D.isInvalidType()) 3587 New->setInvalidDecl(); 3588 3589 // Parameter declarators cannot be interface types. All ObjC objects are 3590 // passed by reference. 3591 if (T->isObjCInterfaceType()) { 3592 Diag(D.getIdentifierLoc(), 3593 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 3594 New->setInvalidDecl(); 3595 } 3596 3597 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 3598 if (D.getCXXScopeSpec().isSet()) { 3599 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 3600 << D.getCXXScopeSpec().getRange(); 3601 New->setInvalidDecl(); 3602 } 3603 3604 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 3605 // duration shall not be qualified by an address-space qualifier." 3606 // Since all parameters have automatic store duration, they can not have 3607 // an address space. 3608 if (T.getAddressSpace() != 0) { 3609 Diag(D.getIdentifierLoc(), 3610 diag::err_arg_with_address_space); 3611 New->setInvalidDecl(); 3612 } 3613 3614 3615 // Add the parameter declaration into this scope. 3616 S->AddDecl(DeclPtrTy::make(New)); 3617 if (II) 3618 IdResolver.AddDecl(New); 3619 3620 ProcessDeclAttributes(S, New, D); 3621 3622 if (New->hasAttr<BlocksAttr>()) { 3623 Diag(New->getLocation(), diag::err_block_on_nonlocal); 3624 } 3625 return DeclPtrTy::make(New); 3626} 3627 3628void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 3629 SourceLocation LocAfterDecls) { 3630 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3631 "Not a function declarator!"); 3632 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3633 3634 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 3635 // for a K&R function. 3636 if (!FTI.hasPrototype) { 3637 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 3638 --i; 3639 if (FTI.ArgInfo[i].Param == 0) { 3640 std::string Code = " int "; 3641 Code += FTI.ArgInfo[i].Ident->getName(); 3642 Code += ";\n"; 3643 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 3644 << FTI.ArgInfo[i].Ident 3645 << CodeModificationHint::CreateInsertion(LocAfterDecls, Code); 3646 3647 // Implicitly declare the argument as type 'int' for lack of a better 3648 // type. 3649 DeclSpec DS; 3650 const char* PrevSpec; // unused 3651 unsigned DiagID; // unused 3652 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 3653 PrevSpec, DiagID); 3654 Declarator ParamD(DS, Declarator::KNRTypeListContext); 3655 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 3656 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 3657 } 3658 } 3659 } 3660} 3661 3662Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 3663 Declarator &D) { 3664 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 3665 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3666 "Not a function declarator!"); 3667 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3668 3669 if (FTI.hasPrototype) { 3670 // FIXME: Diagnose arguments without names in C. 3671 } 3672 3673 Scope *ParentScope = FnBodyScope->getParent(); 3674 3675 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 3676 MultiTemplateParamsArg(*this), 3677 /*IsFunctionDefinition=*/true); 3678 return ActOnStartOfFunctionDef(FnBodyScope, DP); 3679} 3680 3681Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 3682 if (!D) 3683 return D; 3684 FunctionDecl *FD = 0; 3685 3686 if (FunctionTemplateDecl *FunTmpl 3687 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>())) 3688 FD = FunTmpl->getTemplatedDecl(); 3689 else 3690 FD = cast<FunctionDecl>(D.getAs<Decl>()); 3691 3692 CurFunctionNeedsScopeChecking = false; 3693 3694 // See if this is a redefinition. 3695 const FunctionDecl *Definition; 3696 if (FD->getBody(Definition)) { 3697 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 3698 Diag(Definition->getLocation(), diag::note_previous_definition); 3699 } 3700 3701 // Builtin functions cannot be defined. 3702 if (unsigned BuiltinID = FD->getBuiltinID()) { 3703 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 3704 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 3705 FD->setInvalidDecl(); 3706 } 3707 } 3708 3709 // The return type of a function definition must be complete 3710 // (C99 6.9.1p3, C++ [dcl.fct]p6). 3711 QualType ResultType = FD->getResultType(); 3712 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 3713 !FD->isInvalidDecl() && 3714 RequireCompleteType(FD->getLocation(), ResultType, 3715 diag::err_func_def_incomplete_result)) 3716 FD->setInvalidDecl(); 3717 3718 // GNU warning -Wmissing-prototypes: 3719 // Warn if a global function is defined without a previous 3720 // prototype declaration. This warning is issued even if the 3721 // definition itself provides a prototype. The aim is to detect 3722 // global functions that fail to be declared in header files. 3723 if (!FD->isInvalidDecl() && FD->isGlobal() && !isa<CXXMethodDecl>(FD) && 3724 !FD->isMain()) { 3725 bool MissingPrototype = true; 3726 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 3727 Prev; Prev = Prev->getPreviousDeclaration()) { 3728 // Ignore any declarations that occur in function or method 3729 // scope, because they aren't visible from the header. 3730 if (Prev->getDeclContext()->isFunctionOrMethod()) 3731 continue; 3732 3733 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 3734 break; 3735 } 3736 3737 if (MissingPrototype) 3738 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 3739 } 3740 3741 if (FnBodyScope) 3742 PushDeclContext(FnBodyScope, FD); 3743 3744 // Check the validity of our function parameters 3745 CheckParmsForFunctionDef(FD); 3746 3747 // Introduce our parameters into the function scope 3748 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 3749 ParmVarDecl *Param = FD->getParamDecl(p); 3750 Param->setOwningFunction(FD); 3751 3752 // If this has an identifier, add it to the scope stack. 3753 if (Param->getIdentifier() && FnBodyScope) 3754 PushOnScopeChains(Param, FnBodyScope); 3755 } 3756 3757 // Checking attributes of current function definition 3758 // dllimport attribute. 3759 if (FD->getAttr<DLLImportAttr>() && 3760 (!FD->getAttr<DLLExportAttr>())) { 3761 // dllimport attribute cannot be applied to definition. 3762 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 3763 Diag(FD->getLocation(), 3764 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 3765 << "dllimport"; 3766 FD->setInvalidDecl(); 3767 return DeclPtrTy::make(FD); 3768 } else { 3769 // If a symbol previously declared dllimport is later defined, the 3770 // attribute is ignored in subsequent references, and a warning is 3771 // emitted. 3772 Diag(FD->getLocation(), 3773 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 3774 << FD->getNameAsCString() << "dllimport"; 3775 } 3776 } 3777 return DeclPtrTy::make(FD); 3778} 3779 3780Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 3781 return ActOnFinishFunctionBody(D, move(BodyArg), false); 3782} 3783 3784Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 3785 bool IsInstantiation) { 3786 Decl *dcl = D.getAs<Decl>(); 3787 Stmt *Body = BodyArg.takeAs<Stmt>(); 3788 3789 FunctionDecl *FD = 0; 3790 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 3791 if (FunTmpl) 3792 FD = FunTmpl->getTemplatedDecl(); 3793 else 3794 FD = dyn_cast_or_null<FunctionDecl>(dcl); 3795 3796 if (FD) { 3797 FD->setBody(Body); 3798 if (FD->isMain()) 3799 // C and C++ allow for main to automagically return 0. 3800 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 3801 FD->setHasImplicitReturnZero(true); 3802 else 3803 CheckFallThroughForFunctionDef(FD, Body); 3804 3805 if (!FD->isInvalidDecl()) 3806 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 3807 3808 // C++ [basic.def.odr]p2: 3809 // [...] A virtual member function is used if it is not pure. [...] 3810 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 3811 if (Method->isVirtual() && !Method->isPure()) 3812 MarkDeclarationReferenced(Method->getLocation(), Method); 3813 3814 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 3815 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 3816 assert(MD == getCurMethodDecl() && "Method parsing confused"); 3817 MD->setBody(Body); 3818 CheckFallThroughForFunctionDef(MD, Body); 3819 MD->setEndLoc(Body->getLocEnd()); 3820 3821 if (!MD->isInvalidDecl()) 3822 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 3823 } else { 3824 Body->Destroy(Context); 3825 return DeclPtrTy(); 3826 } 3827 if (!IsInstantiation) 3828 PopDeclContext(); 3829 3830 // Verify and clean out per-function state. 3831 3832 assert(&getLabelMap() == &FunctionLabelMap && "Didn't pop block right?"); 3833 3834 // Check goto/label use. 3835 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 3836 I = FunctionLabelMap.begin(), E = FunctionLabelMap.end(); I != E; ++I) { 3837 LabelStmt *L = I->second; 3838 3839 // Verify that we have no forward references left. If so, there was a goto 3840 // or address of a label taken, but no definition of it. Label fwd 3841 // definitions are indicated with a null substmt. 3842 if (L->getSubStmt() != 0) 3843 continue; 3844 3845 // Emit error. 3846 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 3847 3848 // At this point, we have gotos that use the bogus label. Stitch it into 3849 // the function body so that they aren't leaked and that the AST is well 3850 // formed. 3851 if (Body == 0) { 3852 // The whole function wasn't parsed correctly, just delete this. 3853 L->Destroy(Context); 3854 continue; 3855 } 3856 3857 // Otherwise, the body is valid: we want to stitch the label decl into the 3858 // function somewhere so that it is properly owned and so that the goto 3859 // has a valid target. Do this by creating a new compound stmt with the 3860 // label in it. 3861 3862 // Give the label a sub-statement. 3863 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 3864 3865 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 3866 cast<CXXTryStmt>(Body)->getTryBlock() : 3867 cast<CompoundStmt>(Body); 3868 std::vector<Stmt*> Elements(Compound->body_begin(), Compound->body_end()); 3869 Elements.push_back(L); 3870 Compound->setStmts(Context, &Elements[0], Elements.size()); 3871 } 3872 FunctionLabelMap.clear(); 3873 3874 if (!Body) return D; 3875 3876 // Verify that that gotos and switch cases don't jump into scopes illegally. 3877 if (CurFunctionNeedsScopeChecking) 3878 DiagnoseInvalidJumps(Body); 3879 3880 // C++ constructors that have function-try-blocks can't have return 3881 // statements in the handlers of that block. (C++ [except.handle]p14) 3882 // Verify this. 3883 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 3884 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 3885 3886 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 3887 computeBaseOrMembersToDestroy(Destructor); 3888 return D; 3889} 3890 3891/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 3892/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 3893NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 3894 IdentifierInfo &II, Scope *S) { 3895 // Before we produce a declaration for an implicitly defined 3896 // function, see whether there was a locally-scoped declaration of 3897 // this name as a function or variable. If so, use that 3898 // (non-visible) declaration, and complain about it. 3899 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3900 = LocallyScopedExternalDecls.find(&II); 3901 if (Pos != LocallyScopedExternalDecls.end()) { 3902 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 3903 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 3904 return Pos->second; 3905 } 3906 3907 // Extension in C99. Legal in C90, but warn about it. 3908 static const unsigned int BuiltinLen = strlen("__builtin_"); 3909 if (II.getLength() > BuiltinLen && 3910 std::equal(II.getName(), II.getName() + BuiltinLen, "__builtin_")) 3911 Diag(Loc, diag::warn_builtin_unknown) << &II; 3912 else if (getLangOptions().C99) 3913 Diag(Loc, diag::ext_implicit_function_decl) << &II; 3914 else 3915 Diag(Loc, diag::warn_implicit_function_decl) << &II; 3916 3917 // Set a Declarator for the implicit definition: int foo(); 3918 const char *Dummy; 3919 DeclSpec DS; 3920 unsigned DiagID; 3921 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 3922 Error = Error; // Silence warning. 3923 assert(!Error && "Error setting up implicit decl!"); 3924 Declarator D(DS, Declarator::BlockContext); 3925 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 3926 0, 0, false, SourceLocation(), 3927 false, 0,0,0, Loc, Loc, D), 3928 SourceLocation()); 3929 D.SetIdentifier(&II, Loc); 3930 3931 // Insert this function into translation-unit scope. 3932 3933 DeclContext *PrevDC = CurContext; 3934 CurContext = Context.getTranslationUnitDecl(); 3935 3936 FunctionDecl *FD = 3937 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 3938 FD->setImplicit(); 3939 3940 CurContext = PrevDC; 3941 3942 AddKnownFunctionAttributes(FD); 3943 3944 return FD; 3945} 3946 3947/// \brief Adds any function attributes that we know a priori based on 3948/// the declaration of this function. 3949/// 3950/// These attributes can apply both to implicitly-declared builtins 3951/// (like __builtin___printf_chk) or to library-declared functions 3952/// like NSLog or printf. 3953void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 3954 if (FD->isInvalidDecl()) 3955 return; 3956 3957 // If this is a built-in function, map its builtin attributes to 3958 // actual attributes. 3959 if (unsigned BuiltinID = FD->getBuiltinID()) { 3960 // Handle printf-formatting attributes. 3961 unsigned FormatIdx; 3962 bool HasVAListArg; 3963 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 3964 if (!FD->getAttr<FormatAttr>()) 3965 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 3966 HasVAListArg ? 0 : FormatIdx + 2)); 3967 } 3968 3969 // Mark const if we don't care about errno and that is the only 3970 // thing preventing the function from being const. This allows 3971 // IRgen to use LLVM intrinsics for such functions. 3972 if (!getLangOptions().MathErrno && 3973 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 3974 if (!FD->getAttr<ConstAttr>()) 3975 FD->addAttr(::new (Context) ConstAttr()); 3976 } 3977 3978 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 3979 FD->addAttr(::new (Context) NoReturnAttr()); 3980 } 3981 3982 IdentifierInfo *Name = FD->getIdentifier(); 3983 if (!Name) 3984 return; 3985 if ((!getLangOptions().CPlusPlus && 3986 FD->getDeclContext()->isTranslationUnit()) || 3987 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 3988 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 3989 LinkageSpecDecl::lang_c)) { 3990 // Okay: this could be a libc/libm/Objective-C function we know 3991 // about. 3992 } else 3993 return; 3994 3995 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 3996 // FIXME: NSLog and NSLogv should be target specific 3997 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 3998 // FIXME: We known better than our headers. 3999 const_cast<FormatAttr *>(Format)->setType("printf"); 4000 } else 4001 FD->addAttr(::new (Context) FormatAttr("printf", 1, 4002 Name->isStr("NSLogv") ? 0 : 2)); 4003 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 4004 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 4005 // target-specific builtins, perhaps? 4006 if (!FD->getAttr<FormatAttr>()) 4007 FD->addAttr(::new (Context) FormatAttr("printf", 2, 4008 Name->isStr("vasprintf") ? 0 : 3)); 4009 } 4010} 4011 4012TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T) { 4013 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 4014 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 4015 4016 // Scope manipulation handled by caller. 4017 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 4018 D.getIdentifierLoc(), 4019 D.getIdentifier(), 4020 T); 4021 4022 if (const TagType *TT = T->getAs<TagType>()) { 4023 TagDecl *TD = TT->getDecl(); 4024 4025 // If the TagDecl that the TypedefDecl points to is an anonymous decl 4026 // keep track of the TypedefDecl. 4027 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 4028 TD->setTypedefForAnonDecl(NewTD); 4029 } 4030 4031 if (D.isInvalidType()) 4032 NewTD->setInvalidDecl(); 4033 return NewTD; 4034} 4035 4036 4037/// \brief Determine whether a tag with a given kind is acceptable 4038/// as a redeclaration of the given tag declaration. 4039/// 4040/// \returns true if the new tag kind is acceptable, false otherwise. 4041bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 4042 TagDecl::TagKind NewTag, 4043 SourceLocation NewTagLoc, 4044 const IdentifierInfo &Name) { 4045 // C++ [dcl.type.elab]p3: 4046 // The class-key or enum keyword present in the 4047 // elaborated-type-specifier shall agree in kind with the 4048 // declaration to which the name in theelaborated-type-specifier 4049 // refers. This rule also applies to the form of 4050 // elaborated-type-specifier that declares a class-name or 4051 // friend class since it can be construed as referring to the 4052 // definition of the class. Thus, in any 4053 // elaborated-type-specifier, the enum keyword shall be used to 4054 // refer to an enumeration (7.2), the union class-keyshall be 4055 // used to refer to a union (clause 9), and either the class or 4056 // struct class-key shall be used to refer to a class (clause 9) 4057 // declared using the class or struct class-key. 4058 TagDecl::TagKind OldTag = Previous->getTagKind(); 4059 if (OldTag == NewTag) 4060 return true; 4061 4062 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 4063 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 4064 // Warn about the struct/class tag mismatch. 4065 bool isTemplate = false; 4066 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 4067 isTemplate = Record->getDescribedClassTemplate(); 4068 4069 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 4070 << (NewTag == TagDecl::TK_class) 4071 << isTemplate << &Name 4072 << CodeModificationHint::CreateReplacement(SourceRange(NewTagLoc), 4073 OldTag == TagDecl::TK_class? "class" : "struct"); 4074 Diag(Previous->getLocation(), diag::note_previous_use); 4075 return true; 4076 } 4077 return false; 4078} 4079 4080/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 4081/// former case, Name will be non-null. In the later case, Name will be null. 4082/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 4083/// reference/declaration/definition of a tag. 4084Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 4085 SourceLocation KWLoc, const CXXScopeSpec &SS, 4086 IdentifierInfo *Name, SourceLocation NameLoc, 4087 AttributeList *Attr, AccessSpecifier AS, 4088 MultiTemplateParamsArg TemplateParameterLists, 4089 bool &OwnedDecl, bool &IsDependent) { 4090 // If this is not a definition, it must have a name. 4091 assert((Name != 0 || TUK == TUK_Definition) && 4092 "Nameless record must be a definition!"); 4093 4094 OwnedDecl = false; 4095 TagDecl::TagKind Kind = TagDecl::getTagKindForTypeSpec(TagSpec); 4096 4097 // FIXME: Check explicit specializations more carefully. 4098 bool isExplicitSpecialization = false; 4099 if (TUK != TUK_Reference) { 4100 if (TemplateParameterList *TemplateParams 4101 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 4102 (TemplateParameterList**)TemplateParameterLists.get(), 4103 TemplateParameterLists.size(), 4104 isExplicitSpecialization)) { 4105 if (TemplateParams->size() > 0) { 4106 // This is a declaration or definition of a class template (which may 4107 // be a member of another template). 4108 OwnedDecl = false; 4109 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 4110 SS, Name, NameLoc, Attr, 4111 TemplateParams, 4112 AS); 4113 TemplateParameterLists.release(); 4114 return Result.get(); 4115 } else { 4116 // The "template<>" header is extraneous. 4117 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 4118 << ElaboratedType::getNameForTagKind(Kind) << Name; 4119 isExplicitSpecialization = true; 4120 } 4121 } 4122 4123 TemplateParameterLists.release(); 4124 } 4125 4126 DeclContext *SearchDC = CurContext; 4127 DeclContext *DC = CurContext; 4128 NamedDecl *PrevDecl = 0; 4129 bool isStdBadAlloc = false; 4130 bool Invalid = false; 4131 4132 if (Name && SS.isNotEmpty()) { 4133 // We have a nested-name tag ('struct foo::bar'). 4134 4135 // Check for invalid 'foo::'. 4136 if (SS.isInvalid()) { 4137 Name = 0; 4138 goto CreateNewDecl; 4139 } 4140 4141 // If this is a friend or a reference to a class in a dependent 4142 // context, don't try to make a decl for it. 4143 if (TUK == TUK_Friend || TUK == TUK_Reference) { 4144 DC = computeDeclContext(SS, false); 4145 if (!DC) { 4146 IsDependent = true; 4147 return DeclPtrTy(); 4148 } 4149 } 4150 4151 if (RequireCompleteDeclContext(SS)) 4152 return DeclPtrTy::make((Decl *)0); 4153 4154 DC = computeDeclContext(SS, true); 4155 SearchDC = DC; 4156 // Look-up name inside 'foo::'. 4157 LookupResult R; 4158 LookupQualifiedName(R, DC, Name, LookupTagName, true); 4159 PrevDecl = dyn_cast_or_null<TagDecl>(R.getAsSingleDecl(Context)); 4160 4161 // A tag 'foo::bar' must already exist. 4162 if (PrevDecl == 0) { 4163 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 4164 Name = 0; 4165 Invalid = true; 4166 goto CreateNewDecl; 4167 } 4168 } else if (Name) { 4169 // If this is a named struct, check to see if there was a previous forward 4170 // declaration or definition. 4171 // FIXME: We're looking into outer scopes here, even when we 4172 // shouldn't be. Doing so can result in ambiguities that we 4173 // shouldn't be diagnosing. 4174 LookupResult R; 4175 LookupName(R, S, Name, LookupTagName, 4176 /*RedeclarationOnly=*/(TUK != TUK_Reference)); 4177 if (R.isAmbiguous()) { 4178 DiagnoseAmbiguousLookup(R, Name, NameLoc); 4179 // FIXME: This is not best way to recover from case like: 4180 // 4181 // struct S s; 4182 // 4183 // causes needless "incomplete type" error later. 4184 Name = 0; 4185 PrevDecl = 0; 4186 Invalid = true; 4187 } else 4188 PrevDecl = R.getAsSingleDecl(Context); 4189 4190 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 4191 // FIXME: This makes sure that we ignore the contexts associated 4192 // with C structs, unions, and enums when looking for a matching 4193 // tag declaration or definition. See the similar lookup tweak 4194 // in Sema::LookupName; is there a better way to deal with this? 4195 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 4196 SearchDC = SearchDC->getParent(); 4197 } 4198 } 4199 4200 if (PrevDecl && PrevDecl->isTemplateParameter()) { 4201 // Maybe we will complain about the shadowed template parameter. 4202 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 4203 // Just pretend that we didn't see the previous declaration. 4204 PrevDecl = 0; 4205 } 4206 4207 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 4208 DC->Equals(StdNamespace) && Name->isStr("bad_alloc")) { 4209 // This is a declaration of or a reference to "std::bad_alloc". 4210 isStdBadAlloc = true; 4211 4212 if (!PrevDecl && StdBadAlloc) { 4213 // std::bad_alloc has been implicitly declared (but made invisible to 4214 // name lookup). Fill in this implicit declaration as the previous 4215 // declaration, so that the declarations get chained appropriately. 4216 PrevDecl = StdBadAlloc; 4217 } 4218 } 4219 4220 if (PrevDecl) { 4221 // Check whether the previous declaration is usable. 4222 (void)DiagnoseUseOfDecl(PrevDecl, NameLoc); 4223 4224 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 4225 // If this is a use of a previous tag, or if the tag is already declared 4226 // in the same scope (so that the definition/declaration completes or 4227 // rementions the tag), reuse the decl. 4228 if (TUK == TUK_Reference || TUK == TUK_Friend || 4229 isDeclInScope(PrevDecl, SearchDC, S)) { 4230 // Make sure that this wasn't declared as an enum and now used as a 4231 // struct or something similar. 4232 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 4233 bool SafeToContinue 4234 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 4235 Kind != TagDecl::TK_enum); 4236 if (SafeToContinue) 4237 Diag(KWLoc, diag::err_use_with_wrong_tag) 4238 << Name 4239 << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), 4240 PrevTagDecl->getKindName()); 4241 else 4242 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 4243 Diag(PrevDecl->getLocation(), diag::note_previous_use); 4244 4245 if (SafeToContinue) 4246 Kind = PrevTagDecl->getTagKind(); 4247 else { 4248 // Recover by making this an anonymous redefinition. 4249 Name = 0; 4250 PrevDecl = 0; 4251 Invalid = true; 4252 } 4253 } 4254 4255 if (!Invalid) { 4256 // If this is a use, just return the declaration we found. 4257 4258 // FIXME: In the future, return a variant or some other clue 4259 // for the consumer of this Decl to know it doesn't own it. 4260 // For our current ASTs this shouldn't be a problem, but will 4261 // need to be changed with DeclGroups. 4262 if (TUK == TUK_Reference || TUK == TUK_Friend) 4263 return DeclPtrTy::make(PrevDecl); 4264 4265 // Diagnose attempts to redefine a tag. 4266 if (TUK == TUK_Definition) { 4267 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 4268 Diag(NameLoc, diag::err_redefinition) << Name; 4269 Diag(Def->getLocation(), diag::note_previous_definition); 4270 // If this is a redefinition, recover by making this 4271 // struct be anonymous, which will make any later 4272 // references get the previous definition. 4273 Name = 0; 4274 PrevDecl = 0; 4275 Invalid = true; 4276 } else { 4277 // If the type is currently being defined, complain 4278 // about a nested redefinition. 4279 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 4280 if (Tag->isBeingDefined()) { 4281 Diag(NameLoc, diag::err_nested_redefinition) << Name; 4282 Diag(PrevTagDecl->getLocation(), 4283 diag::note_previous_definition); 4284 Name = 0; 4285 PrevDecl = 0; 4286 Invalid = true; 4287 } 4288 } 4289 4290 // Okay, this is definition of a previously declared or referenced 4291 // tag PrevDecl. We're going to create a new Decl for it. 4292 } 4293 } 4294 // If we get here we have (another) forward declaration or we 4295 // have a definition. Just create a new decl. 4296 4297 } else { 4298 // If we get here, this is a definition of a new tag type in a nested 4299 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 4300 // new decl/type. We set PrevDecl to NULL so that the entities 4301 // have distinct types. 4302 PrevDecl = 0; 4303 } 4304 // If we get here, we're going to create a new Decl. If PrevDecl 4305 // is non-NULL, it's a definition of the tag declared by 4306 // PrevDecl. If it's NULL, we have a new definition. 4307 } else { 4308 // PrevDecl is a namespace, template, or anything else 4309 // that lives in the IDNS_Tag identifier namespace. 4310 if (isDeclInScope(PrevDecl, SearchDC, S)) { 4311 // The tag name clashes with a namespace name, issue an error and 4312 // recover by making this tag be anonymous. 4313 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 4314 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4315 Name = 0; 4316 PrevDecl = 0; 4317 Invalid = true; 4318 } else { 4319 // The existing declaration isn't relevant to us; we're in a 4320 // new scope, so clear out the previous declaration. 4321 PrevDecl = 0; 4322 } 4323 } 4324 } else if (TUK == TUK_Reference && SS.isEmpty() && Name && 4325 (Kind != TagDecl::TK_enum || !getLangOptions().CPlusPlus)) { 4326 // C++ [basic.scope.pdecl]p5: 4327 // -- for an elaborated-type-specifier of the form 4328 // 4329 // class-key identifier 4330 // 4331 // if the elaborated-type-specifier is used in the 4332 // decl-specifier-seq or parameter-declaration-clause of a 4333 // function defined in namespace scope, the identifier is 4334 // declared as a class-name in the namespace that contains 4335 // the declaration; otherwise, except as a friend 4336 // declaration, the identifier is declared in the smallest 4337 // non-class, non-function-prototype scope that contains the 4338 // declaration. 4339 // 4340 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 4341 // C structs and unions. 4342 // 4343 // GNU C also supports this behavior as part of its incomplete 4344 // enum types extension, while GNU C++ does not. 4345 // 4346 // Find the context where we'll be declaring the tag. 4347 // FIXME: We would like to maintain the current DeclContext as the 4348 // lexical context, 4349 while (SearchDC->isRecord()) 4350 SearchDC = SearchDC->getParent(); 4351 4352 // Find the scope where we'll be declaring the tag. 4353 while (S->isClassScope() || 4354 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 4355 ((S->getFlags() & Scope::DeclScope) == 0) || 4356 (S->getEntity() && 4357 ((DeclContext *)S->getEntity())->isTransparentContext())) 4358 S = S->getParent(); 4359 4360 } else if (TUK == TUK_Friend && SS.isEmpty() && Name) { 4361 // C++ [namespace.memdef]p3: 4362 // If a friend declaration in a non-local class first declares a 4363 // class or function, the friend class or function is a member of 4364 // the innermost enclosing namespace. 4365 while (!SearchDC->isFileContext()) 4366 SearchDC = SearchDC->getParent(); 4367 4368 // The entity of a decl scope is a DeclContext; see PushDeclContext. 4369 while (S->getEntity() != SearchDC) 4370 S = S->getParent(); 4371 } 4372 4373CreateNewDecl: 4374 4375 // If there is an identifier, use the location of the identifier as the 4376 // location of the decl, otherwise use the location of the struct/union 4377 // keyword. 4378 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 4379 4380 // Otherwise, create a new declaration. If there is a previous 4381 // declaration of the same entity, the two will be linked via 4382 // PrevDecl. 4383 TagDecl *New; 4384 4385 if (Kind == TagDecl::TK_enum) { 4386 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4387 // enum X { A, B, C } D; D should chain to X. 4388 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 4389 cast_or_null<EnumDecl>(PrevDecl)); 4390 // If this is an undefined enum, warn. 4391 if (TUK != TUK_Definition && !Invalid) { 4392 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 4393 : diag::ext_forward_ref_enum; 4394 Diag(Loc, DK); 4395 } 4396 } else { 4397 // struct/union/class 4398 4399 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4400 // struct X { int A; } D; D should chain to X. 4401 if (getLangOptions().CPlusPlus) { 4402 // FIXME: Look for a way to use RecordDecl for simple structs. 4403 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4404 cast_or_null<CXXRecordDecl>(PrevDecl)); 4405 4406 if (isStdBadAlloc && (!StdBadAlloc || StdBadAlloc->isImplicit())) 4407 StdBadAlloc = cast<CXXRecordDecl>(New); 4408 } else 4409 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4410 cast_or_null<RecordDecl>(PrevDecl)); 4411 } 4412 4413 if (Kind != TagDecl::TK_enum) { 4414 // Handle #pragma pack: if the #pragma pack stack has non-default 4415 // alignment, make up a packed attribute for this decl. These 4416 // attributes are checked when the ASTContext lays out the 4417 // structure. 4418 // 4419 // It is important for implementing the correct semantics that this 4420 // happen here (in act on tag decl). The #pragma pack stack is 4421 // maintained as a result of parser callbacks which can occur at 4422 // many points during the parsing of a struct declaration (because 4423 // the #pragma tokens are effectively skipped over during the 4424 // parsing of the struct). 4425 if (unsigned Alignment = getPragmaPackAlignment()) 4426 New->addAttr(::new (Context) PragmaPackAttr(Alignment * 8)); 4427 } 4428 4429 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 4430 // C++ [dcl.typedef]p3: 4431 // [...] Similarly, in a given scope, a class or enumeration 4432 // shall not be declared with the same name as a typedef-name 4433 // that is declared in that scope and refers to a type other 4434 // than the class or enumeration itself. 4435 LookupResult Lookup; 4436 LookupName(Lookup, S, Name, LookupOrdinaryName, true); 4437 TypedefDecl *PrevTypedef = 0; 4438 if (NamedDecl *Prev = Lookup.getAsSingleDecl(Context)) 4439 PrevTypedef = dyn_cast<TypedefDecl>(Prev); 4440 4441 NamedDecl *PrevTypedefNamed = PrevTypedef; 4442 if (PrevTypedef && isDeclInScope(PrevTypedefNamed, SearchDC, S) && 4443 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 4444 Context.getCanonicalType(Context.getTypeDeclType(New))) { 4445 Diag(Loc, diag::err_tag_definition_of_typedef) 4446 << Context.getTypeDeclType(New) 4447 << PrevTypedef->getUnderlyingType(); 4448 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 4449 Invalid = true; 4450 } 4451 } 4452 4453 // If this is a specialization of a member class (of a class template), 4454 // check the specialization. 4455 if (isExplicitSpecialization && CheckMemberSpecialization(New, PrevDecl)) 4456 Invalid = true; 4457 4458 if (Invalid) 4459 New->setInvalidDecl(); 4460 4461 if (Attr) 4462 ProcessDeclAttributeList(S, New, Attr); 4463 4464 // If we're declaring or defining a tag in function prototype scope 4465 // in C, note that this type can only be used within the function. 4466 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 4467 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 4468 4469 // Set the lexical context. If the tag has a C++ scope specifier, the 4470 // lexical context will be different from the semantic context. 4471 New->setLexicalDeclContext(CurContext); 4472 4473 // Mark this as a friend decl if applicable. 4474 if (TUK == TUK_Friend) 4475 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ PrevDecl != NULL); 4476 4477 // Set the access specifier. 4478 if (!Invalid && TUK != TUK_Friend) 4479 SetMemberAccessSpecifier(New, PrevDecl, AS); 4480 4481 if (TUK == TUK_Definition) 4482 New->startDefinition(); 4483 4484 // If this has an identifier, add it to the scope stack. 4485 if (TUK == TUK_Friend) { 4486 // We might be replacing an existing declaration in the lookup tables; 4487 // if so, borrow its access specifier. 4488 if (PrevDecl) 4489 New->setAccess(PrevDecl->getAccess()); 4490 4491 // Friend tag decls are visible in fairly strange ways. 4492 if (!CurContext->isDependentContext()) { 4493 DeclContext *DC = New->getDeclContext()->getLookupContext(); 4494 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 4495 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4496 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 4497 } 4498 } else if (Name) { 4499 S = getNonFieldDeclScope(S); 4500 PushOnScopeChains(New, S); 4501 } else { 4502 CurContext->addDecl(New); 4503 } 4504 4505 // If this is the C FILE type, notify the AST context. 4506 if (IdentifierInfo *II = New->getIdentifier()) 4507 if (!New->isInvalidDecl() && 4508 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 4509 II->isStr("FILE")) 4510 Context.setFILEDecl(New); 4511 4512 OwnedDecl = true; 4513 return DeclPtrTy::make(New); 4514} 4515 4516void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 4517 AdjustDeclIfTemplate(TagD); 4518 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 4519 4520 // Enter the tag context. 4521 PushDeclContext(S, Tag); 4522 4523 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 4524 FieldCollector->StartClass(); 4525 4526 if (Record->getIdentifier()) { 4527 // C++ [class]p2: 4528 // [...] The class-name is also inserted into the scope of the 4529 // class itself; this is known as the injected-class-name. For 4530 // purposes of access checking, the injected-class-name is treated 4531 // as if it were a public member name. 4532 CXXRecordDecl *InjectedClassName 4533 = CXXRecordDecl::Create(Context, Record->getTagKind(), 4534 CurContext, Record->getLocation(), 4535 Record->getIdentifier(), 4536 Record->getTagKeywordLoc(), 4537 Record); 4538 InjectedClassName->setImplicit(); 4539 InjectedClassName->setAccess(AS_public); 4540 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 4541 InjectedClassName->setDescribedClassTemplate(Template); 4542 PushOnScopeChains(InjectedClassName, S); 4543 assert(InjectedClassName->isInjectedClassName() && 4544 "Broken injected-class-name"); 4545 } 4546 } 4547} 4548 4549void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 4550 SourceLocation RBraceLoc) { 4551 AdjustDeclIfTemplate(TagD); 4552 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 4553 Tag->setRBraceLoc(RBraceLoc); 4554 4555 if (isa<CXXRecordDecl>(Tag)) 4556 FieldCollector->FinishClass(); 4557 4558 // Exit this scope of this tag's definition. 4559 PopDeclContext(); 4560 4561 // Notify the consumer that we've defined a tag. 4562 Consumer.HandleTagDeclDefinition(Tag); 4563} 4564 4565// Note that FieldName may be null for anonymous bitfields. 4566bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 4567 QualType FieldTy, const Expr *BitWidth, 4568 bool *ZeroWidth) { 4569 // Default to true; that shouldn't confuse checks for emptiness 4570 if (ZeroWidth) 4571 *ZeroWidth = true; 4572 4573 // C99 6.7.2.1p4 - verify the field type. 4574 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 4575 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 4576 // Handle incomplete types with specific error. 4577 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 4578 return true; 4579 if (FieldName) 4580 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 4581 << FieldName << FieldTy << BitWidth->getSourceRange(); 4582 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 4583 << FieldTy << BitWidth->getSourceRange(); 4584 } 4585 4586 // If the bit-width is type- or value-dependent, don't try to check 4587 // it now. 4588 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 4589 return false; 4590 4591 llvm::APSInt Value; 4592 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 4593 return true; 4594 4595 if (Value != 0 && ZeroWidth) 4596 *ZeroWidth = false; 4597 4598 // Zero-width bitfield is ok for anonymous field. 4599 if (Value == 0 && FieldName) 4600 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 4601 4602 if (Value.isSigned() && Value.isNegative()) { 4603 if (FieldName) 4604 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 4605 << FieldName << Value.toString(10); 4606 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 4607 << Value.toString(10); 4608 } 4609 4610 if (!FieldTy->isDependentType()) { 4611 uint64_t TypeSize = Context.getTypeSize(FieldTy); 4612 if (Value.getZExtValue() > TypeSize) { 4613 if (FieldName) 4614 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 4615 << FieldName << (unsigned)TypeSize; 4616 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 4617 << (unsigned)TypeSize; 4618 } 4619 } 4620 4621 return false; 4622} 4623 4624/// ActOnField - Each field of a struct/union/class is passed into this in order 4625/// to create a FieldDecl object for it. 4626Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 4627 SourceLocation DeclStart, 4628 Declarator &D, ExprTy *BitfieldWidth) { 4629 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 4630 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 4631 AS_public); 4632 return DeclPtrTy::make(Res); 4633} 4634 4635/// HandleField - Analyze a field of a C struct or a C++ data member. 4636/// 4637FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 4638 SourceLocation DeclStart, 4639 Declarator &D, Expr *BitWidth, 4640 AccessSpecifier AS) { 4641 IdentifierInfo *II = D.getIdentifier(); 4642 SourceLocation Loc = DeclStart; 4643 if (II) Loc = D.getIdentifierLoc(); 4644 4645 DeclaratorInfo *DInfo = 0; 4646 QualType T = GetTypeForDeclarator(D, S, &DInfo); 4647 if (getLangOptions().CPlusPlus) 4648 CheckExtraCXXDefaultArguments(D); 4649 4650 DiagnoseFunctionSpecifiers(D); 4651 4652 if (D.getDeclSpec().isThreadSpecified()) 4653 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4654 4655 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, true); 4656 4657 if (PrevDecl && PrevDecl->isTemplateParameter()) { 4658 // Maybe we will complain about the shadowed template parameter. 4659 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4660 // Just pretend that we didn't see the previous declaration. 4661 PrevDecl = 0; 4662 } 4663 4664 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 4665 PrevDecl = 0; 4666 4667 bool Mutable 4668 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 4669 SourceLocation TSSL = D.getSourceRange().getBegin(); 4670 FieldDecl *NewFD 4671 = CheckFieldDecl(II, T, DInfo, Record, Loc, Mutable, BitWidth, TSSL, 4672 AS, PrevDecl, &D); 4673 if (NewFD->isInvalidDecl() && PrevDecl) { 4674 // Don't introduce NewFD into scope; there's already something 4675 // with the same name in the same scope. 4676 } else if (II) { 4677 PushOnScopeChains(NewFD, S); 4678 } else 4679 Record->addDecl(NewFD); 4680 4681 return NewFD; 4682} 4683 4684/// \brief Build a new FieldDecl and check its well-formedness. 4685/// 4686/// This routine builds a new FieldDecl given the fields name, type, 4687/// record, etc. \p PrevDecl should refer to any previous declaration 4688/// with the same name and in the same scope as the field to be 4689/// created. 4690/// 4691/// \returns a new FieldDecl. 4692/// 4693/// \todo The Declarator argument is a hack. It will be removed once 4694FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 4695 DeclaratorInfo *DInfo, 4696 RecordDecl *Record, SourceLocation Loc, 4697 bool Mutable, Expr *BitWidth, 4698 SourceLocation TSSL, 4699 AccessSpecifier AS, NamedDecl *PrevDecl, 4700 Declarator *D) { 4701 IdentifierInfo *II = Name.getAsIdentifierInfo(); 4702 bool InvalidDecl = false; 4703 if (D) InvalidDecl = D->isInvalidType(); 4704 4705 // If we receive a broken type, recover by assuming 'int' and 4706 // marking this declaration as invalid. 4707 if (T.isNull()) { 4708 InvalidDecl = true; 4709 T = Context.IntTy; 4710 } 4711 4712 // C99 6.7.2.1p8: A member of a structure or union may have any type other 4713 // than a variably modified type. 4714 if (T->isVariablyModifiedType()) { 4715 bool SizeIsNegative; 4716 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 4717 SizeIsNegative); 4718 if (!FixedTy.isNull()) { 4719 Diag(Loc, diag::warn_illegal_constant_array_size); 4720 T = FixedTy; 4721 } else { 4722 if (SizeIsNegative) 4723 Diag(Loc, diag::err_typecheck_negative_array_size); 4724 else 4725 Diag(Loc, diag::err_typecheck_field_variable_size); 4726 InvalidDecl = true; 4727 } 4728 } 4729 4730 // Fields can not have abstract class types 4731 if (RequireNonAbstractType(Loc, T, diag::err_abstract_type_in_decl, 4732 AbstractFieldType)) 4733 InvalidDecl = true; 4734 4735 bool ZeroWidth = false; 4736 // If this is declared as a bit-field, check the bit-field. 4737 if (BitWidth && VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 4738 InvalidDecl = true; 4739 DeleteExpr(BitWidth); 4740 BitWidth = 0; 4741 ZeroWidth = false; 4742 } 4743 4744 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, DInfo, 4745 BitWidth, Mutable); 4746 if (InvalidDecl) 4747 NewFD->setInvalidDecl(); 4748 4749 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 4750 Diag(Loc, diag::err_duplicate_member) << II; 4751 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4752 NewFD->setInvalidDecl(); 4753 } 4754 4755 if (getLangOptions().CPlusPlus) { 4756 QualType EltTy = Context.getBaseElementType(T); 4757 4758 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 4759 4760 if (!T->isPODType()) 4761 CXXRecord->setPOD(false); 4762 if (!ZeroWidth) 4763 CXXRecord->setEmpty(false); 4764 4765 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 4766 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 4767 4768 if (!RDecl->hasTrivialConstructor()) 4769 CXXRecord->setHasTrivialConstructor(false); 4770 if (!RDecl->hasTrivialCopyConstructor()) 4771 CXXRecord->setHasTrivialCopyConstructor(false); 4772 if (!RDecl->hasTrivialCopyAssignment()) 4773 CXXRecord->setHasTrivialCopyAssignment(false); 4774 if (!RDecl->hasTrivialDestructor()) 4775 CXXRecord->setHasTrivialDestructor(false); 4776 4777 // C++ 9.5p1: An object of a class with a non-trivial 4778 // constructor, a non-trivial copy constructor, a non-trivial 4779 // destructor, or a non-trivial copy assignment operator 4780 // cannot be a member of a union, nor can an array of such 4781 // objects. 4782 // TODO: C++0x alters this restriction significantly. 4783 if (Record->isUnion()) { 4784 // We check for copy constructors before constructors 4785 // because otherwise we'll never get complaints about 4786 // copy constructors. 4787 4788 const CXXSpecialMember invalid = (CXXSpecialMember) -1; 4789 4790 CXXSpecialMember member; 4791 if (!RDecl->hasTrivialCopyConstructor()) 4792 member = CXXCopyConstructor; 4793 else if (!RDecl->hasTrivialConstructor()) 4794 member = CXXDefaultConstructor; 4795 else if (!RDecl->hasTrivialCopyAssignment()) 4796 member = CXXCopyAssignment; 4797 else if (!RDecl->hasTrivialDestructor()) 4798 member = CXXDestructor; 4799 else 4800 member = invalid; 4801 4802 if (member != invalid) { 4803 Diag(Loc, diag::err_illegal_union_member) << Name << member; 4804 DiagnoseNontrivial(RT, member); 4805 NewFD->setInvalidDecl(); 4806 } 4807 } 4808 } 4809 } 4810 4811 // FIXME: We need to pass in the attributes given an AST 4812 // representation, not a parser representation. 4813 if (D) 4814 // FIXME: What to pass instead of TUScope? 4815 ProcessDeclAttributes(TUScope, NewFD, *D); 4816 4817 if (T.isObjCGCWeak()) 4818 Diag(Loc, diag::warn_attribute_weak_on_field); 4819 4820 NewFD->setAccess(AS); 4821 4822 // C++ [dcl.init.aggr]p1: 4823 // An aggregate is an array or a class (clause 9) with [...] no 4824 // private or protected non-static data members (clause 11). 4825 // A POD must be an aggregate. 4826 if (getLangOptions().CPlusPlus && 4827 (AS == AS_private || AS == AS_protected)) { 4828 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 4829 CXXRecord->setAggregate(false); 4830 CXXRecord->setPOD(false); 4831 } 4832 4833 return NewFD; 4834} 4835 4836/// DiagnoseNontrivial - Given that a class has a non-trivial 4837/// special member, figure out why. 4838void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 4839 QualType QT(T, 0U); 4840 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 4841 4842 // Check whether the member was user-declared. 4843 switch (member) { 4844 case CXXDefaultConstructor: 4845 if (RD->hasUserDeclaredConstructor()) { 4846 typedef CXXRecordDecl::ctor_iterator ctor_iter; 4847 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce; ++ci) 4848 if (!ci->isImplicitlyDefined(Context)) { 4849 SourceLocation CtorLoc = ci->getLocation(); 4850 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 4851 return; 4852 } 4853 4854 assert(0 && "found no user-declared constructors"); 4855 return; 4856 } 4857 break; 4858 4859 case CXXCopyConstructor: 4860 if (RD->hasUserDeclaredCopyConstructor()) { 4861 SourceLocation CtorLoc = 4862 RD->getCopyConstructor(Context, 0)->getLocation(); 4863 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 4864 return; 4865 } 4866 break; 4867 4868 case CXXCopyAssignment: 4869 if (RD->hasUserDeclaredCopyAssignment()) { 4870 // FIXME: this should use the location of the copy 4871 // assignment, not the type. 4872 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 4873 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 4874 return; 4875 } 4876 break; 4877 4878 case CXXDestructor: 4879 if (RD->hasUserDeclaredDestructor()) { 4880 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation(); 4881 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 4882 return; 4883 } 4884 break; 4885 } 4886 4887 typedef CXXRecordDecl::base_class_iterator base_iter; 4888 4889 // Virtual bases and members inhibit trivial copying/construction, 4890 // but not trivial destruction. 4891 if (member != CXXDestructor) { 4892 // Check for virtual bases. vbases includes indirect virtual bases, 4893 // so we just iterate through the direct bases. 4894 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 4895 if (bi->isVirtual()) { 4896 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 4897 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 4898 return; 4899 } 4900 4901 // Check for virtual methods. 4902 typedef CXXRecordDecl::method_iterator meth_iter; 4903 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 4904 ++mi) { 4905 if (mi->isVirtual()) { 4906 SourceLocation MLoc = mi->getSourceRange().getBegin(); 4907 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 4908 return; 4909 } 4910 } 4911 } 4912 4913 bool (CXXRecordDecl::*hasTrivial)() const; 4914 switch (member) { 4915 case CXXDefaultConstructor: 4916 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 4917 case CXXCopyConstructor: 4918 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 4919 case CXXCopyAssignment: 4920 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 4921 case CXXDestructor: 4922 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 4923 default: 4924 assert(0 && "unexpected special member"); return; 4925 } 4926 4927 // Check for nontrivial bases (and recurse). 4928 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 4929 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 4930 assert(BaseRT); 4931 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 4932 if (!(BaseRecTy->*hasTrivial)()) { 4933 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 4934 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 4935 DiagnoseNontrivial(BaseRT, member); 4936 return; 4937 } 4938 } 4939 4940 // Check for nontrivial members (and recurse). 4941 typedef RecordDecl::field_iterator field_iter; 4942 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 4943 ++fi) { 4944 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 4945 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 4946 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 4947 4948 if (!(EltRD->*hasTrivial)()) { 4949 SourceLocation FLoc = (*fi)->getLocation(); 4950 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 4951 DiagnoseNontrivial(EltRT, member); 4952 return; 4953 } 4954 } 4955 } 4956 4957 assert(0 && "found no explanation for non-trivial member"); 4958} 4959 4960/// TranslateIvarVisibility - Translate visibility from a token ID to an 4961/// AST enum value. 4962static ObjCIvarDecl::AccessControl 4963TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 4964 switch (ivarVisibility) { 4965 default: assert(0 && "Unknown visitibility kind"); 4966 case tok::objc_private: return ObjCIvarDecl::Private; 4967 case tok::objc_public: return ObjCIvarDecl::Public; 4968 case tok::objc_protected: return ObjCIvarDecl::Protected; 4969 case tok::objc_package: return ObjCIvarDecl::Package; 4970 } 4971} 4972 4973/// ActOnIvar - Each ivar field of an objective-c class is passed into this 4974/// in order to create an IvarDecl object for it. 4975Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 4976 SourceLocation DeclStart, 4977 DeclPtrTy IntfDecl, 4978 Declarator &D, ExprTy *BitfieldWidth, 4979 tok::ObjCKeywordKind Visibility) { 4980 4981 IdentifierInfo *II = D.getIdentifier(); 4982 Expr *BitWidth = (Expr*)BitfieldWidth; 4983 SourceLocation Loc = DeclStart; 4984 if (II) Loc = D.getIdentifierLoc(); 4985 4986 // FIXME: Unnamed fields can be handled in various different ways, for 4987 // example, unnamed unions inject all members into the struct namespace! 4988 4989 DeclaratorInfo *DInfo = 0; 4990 QualType T = GetTypeForDeclarator(D, S, &DInfo); 4991 4992 if (BitWidth) { 4993 // 6.7.2.1p3, 6.7.2.1p4 4994 if (VerifyBitField(Loc, II, T, BitWidth)) { 4995 D.setInvalidType(); 4996 DeleteExpr(BitWidth); 4997 BitWidth = 0; 4998 } 4999 } else { 5000 // Not a bitfield. 5001 5002 // validate II. 5003 5004 } 5005 5006 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5007 // than a variably modified type. 5008 if (T->isVariablyModifiedType()) { 5009 Diag(Loc, diag::err_typecheck_ivar_variable_size); 5010 D.setInvalidType(); 5011 } 5012 5013 // Get the visibility (access control) for this ivar. 5014 ObjCIvarDecl::AccessControl ac = 5015 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 5016 : ObjCIvarDecl::None; 5017 // Must set ivar's DeclContext to its enclosing interface. 5018 Decl *EnclosingDecl = IntfDecl.getAs<Decl>(); 5019 DeclContext *EnclosingContext; 5020 if (ObjCImplementationDecl *IMPDecl = 5021 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5022 // Case of ivar declared in an implementation. Context is that of its class. 5023 ObjCInterfaceDecl* IDecl = IMPDecl->getClassInterface(); 5024 assert(IDecl && "No class- ActOnIvar"); 5025 EnclosingContext = cast_or_null<DeclContext>(IDecl); 5026 } else 5027 EnclosingContext = dyn_cast<DeclContext>(EnclosingDecl); 5028 assert(EnclosingContext && "null DeclContext for ivar - ActOnIvar"); 5029 5030 // Construct the decl. 5031 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 5032 EnclosingContext, Loc, II, T, 5033 DInfo, ac, (Expr *)BitfieldWidth); 5034 5035 if (II) { 5036 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, true); 5037 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 5038 && !isa<TagDecl>(PrevDecl)) { 5039 Diag(Loc, diag::err_duplicate_member) << II; 5040 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5041 NewID->setInvalidDecl(); 5042 } 5043 } 5044 5045 // Process attributes attached to the ivar. 5046 ProcessDeclAttributes(S, NewID, D); 5047 5048 if (D.isInvalidType()) 5049 NewID->setInvalidDecl(); 5050 5051 if (II) { 5052 // FIXME: When interfaces are DeclContexts, we'll need to add 5053 // these to the interface. 5054 S->AddDecl(DeclPtrTy::make(NewID)); 5055 IdResolver.AddDecl(NewID); 5056 } 5057 5058 return DeclPtrTy::make(NewID); 5059} 5060 5061void Sema::ActOnFields(Scope* S, 5062 SourceLocation RecLoc, DeclPtrTy RecDecl, 5063 DeclPtrTy *Fields, unsigned NumFields, 5064 SourceLocation LBrac, SourceLocation RBrac, 5065 AttributeList *Attr) { 5066 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 5067 assert(EnclosingDecl && "missing record or interface decl"); 5068 5069 // If the decl this is being inserted into is invalid, then it may be a 5070 // redeclaration or some other bogus case. Don't try to add fields to it. 5071 if (EnclosingDecl->isInvalidDecl()) { 5072 // FIXME: Deallocate fields? 5073 return; 5074 } 5075 5076 5077 // Verify that all the fields are okay. 5078 unsigned NumNamedMembers = 0; 5079 llvm::SmallVector<FieldDecl*, 32> RecFields; 5080 5081 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 5082 for (unsigned i = 0; i != NumFields; ++i) { 5083 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 5084 5085 // Get the type for the field. 5086 Type *FDTy = FD->getType().getTypePtr(); 5087 5088 if (!FD->isAnonymousStructOrUnion()) { 5089 // Remember all fields written by the user. 5090 RecFields.push_back(FD); 5091 } 5092 5093 // If the field is already invalid for some reason, don't emit more 5094 // diagnostics about it. 5095 if (FD->isInvalidDecl()) 5096 continue; 5097 5098 // C99 6.7.2.1p2: 5099 // A structure or union shall not contain a member with 5100 // incomplete or function type (hence, a structure shall not 5101 // contain an instance of itself, but may contain a pointer to 5102 // an instance of itself), except that the last member of a 5103 // structure with more than one named member may have incomplete 5104 // array type; such a structure (and any union containing, 5105 // possibly recursively, a member that is such a structure) 5106 // shall not be a member of a structure or an element of an 5107 // array. 5108 if (FDTy->isFunctionType()) { 5109 // Field declared as a function. 5110 Diag(FD->getLocation(), diag::err_field_declared_as_function) 5111 << FD->getDeclName(); 5112 FD->setInvalidDecl(); 5113 EnclosingDecl->setInvalidDecl(); 5114 continue; 5115 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 5116 Record && Record->isStruct()) { 5117 // Flexible array member. 5118 if (NumNamedMembers < 1) { 5119 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 5120 << FD->getDeclName(); 5121 FD->setInvalidDecl(); 5122 EnclosingDecl->setInvalidDecl(); 5123 continue; 5124 } 5125 // Okay, we have a legal flexible array member at the end of the struct. 5126 if (Record) 5127 Record->setHasFlexibleArrayMember(true); 5128 } else if (!FDTy->isDependentType() && 5129 RequireCompleteType(FD->getLocation(), FD->getType(), 5130 diag::err_field_incomplete)) { 5131 // Incomplete type 5132 FD->setInvalidDecl(); 5133 EnclosingDecl->setInvalidDecl(); 5134 continue; 5135 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 5136 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 5137 // If this is a member of a union, then entire union becomes "flexible". 5138 if (Record && Record->isUnion()) { 5139 Record->setHasFlexibleArrayMember(true); 5140 } else { 5141 // If this is a struct/class and this is not the last element, reject 5142 // it. Note that GCC supports variable sized arrays in the middle of 5143 // structures. 5144 if (i != NumFields-1) 5145 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 5146 << FD->getDeclName() << FD->getType(); 5147 else { 5148 // We support flexible arrays at the end of structs in 5149 // other structs as an extension. 5150 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 5151 << FD->getDeclName(); 5152 if (Record) 5153 Record->setHasFlexibleArrayMember(true); 5154 } 5155 } 5156 } 5157 if (Record && FDTTy->getDecl()->hasObjectMember()) 5158 Record->setHasObjectMember(true); 5159 } else if (FDTy->isObjCInterfaceType()) { 5160 /// A field cannot be an Objective-c object 5161 Diag(FD->getLocation(), diag::err_statically_allocated_object); 5162 FD->setInvalidDecl(); 5163 EnclosingDecl->setInvalidDecl(); 5164 continue; 5165 } else if (getLangOptions().ObjC1 && 5166 getLangOptions().getGCMode() != LangOptions::NonGC && 5167 Record && 5168 (FD->getType()->isObjCObjectPointerType() || 5169 FD->getType().isObjCGCStrong())) 5170 Record->setHasObjectMember(true); 5171 // Keep track of the number of named members. 5172 if (FD->getIdentifier()) 5173 ++NumNamedMembers; 5174 } 5175 5176 // Okay, we successfully defined 'Record'. 5177 if (Record) { 5178 Record->completeDefinition(Context); 5179 } else { 5180 ObjCIvarDecl **ClsFields = 5181 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 5182 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 5183 ID->setIVarList(ClsFields, RecFields.size(), Context); 5184 ID->setLocEnd(RBrac); 5185 // Add ivar's to class's DeclContext. 5186 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5187 ClsFields[i]->setLexicalDeclContext(ID); 5188 ID->addDecl(ClsFields[i]); 5189 } 5190 // Must enforce the rule that ivars in the base classes may not be 5191 // duplicates. 5192 if (ID->getSuperClass()) { 5193 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 5194 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 5195 ObjCIvarDecl* Ivar = (*IVI); 5196 5197 if (IdentifierInfo *II = Ivar->getIdentifier()) { 5198 ObjCIvarDecl* prevIvar = 5199 ID->getSuperClass()->lookupInstanceVariable(II); 5200 if (prevIvar) { 5201 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 5202 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 5203 } 5204 } 5205 } 5206 } 5207 } else if (ObjCImplementationDecl *IMPDecl = 5208 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5209 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 5210 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 5211 // Ivar declared in @implementation never belongs to the implementation. 5212 // Only it is in implementation's lexical context. 5213 ClsFields[I]->setLexicalDeclContext(IMPDecl); 5214 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 5215 } 5216 } 5217 5218 if (Attr) 5219 ProcessDeclAttributeList(S, Record, Attr); 5220} 5221 5222EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 5223 EnumConstantDecl *LastEnumConst, 5224 SourceLocation IdLoc, 5225 IdentifierInfo *Id, 5226 ExprArg val) { 5227 Expr *Val = (Expr *)val.get(); 5228 5229 llvm::APSInt EnumVal(32); 5230 QualType EltTy; 5231 if (Val && !Val->isTypeDependent()) { 5232 // Make sure to promote the operand type to int. 5233 UsualUnaryConversions(Val); 5234 if (Val != val.get()) { 5235 val.release(); 5236 val = Val; 5237 } 5238 5239 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 5240 SourceLocation ExpLoc; 5241 if (!Val->isValueDependent() && 5242 VerifyIntegerConstantExpression(Val, &EnumVal)) { 5243 Val = 0; 5244 } else { 5245 EltTy = Val->getType(); 5246 } 5247 } 5248 5249 if (!Val) { 5250 if (LastEnumConst) { 5251 // Assign the last value + 1. 5252 EnumVal = LastEnumConst->getInitVal(); 5253 ++EnumVal; 5254 5255 // Check for overflow on increment. 5256 if (EnumVal < LastEnumConst->getInitVal()) 5257 Diag(IdLoc, diag::warn_enum_value_overflow); 5258 5259 EltTy = LastEnumConst->getType(); 5260 } else { 5261 // First value, set to zero. 5262 EltTy = Context.IntTy; 5263 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 5264 } 5265 } 5266 5267 val.release(); 5268 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 5269 Val, EnumVal); 5270} 5271 5272 5273Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 5274 DeclPtrTy lastEnumConst, 5275 SourceLocation IdLoc, 5276 IdentifierInfo *Id, 5277 SourceLocation EqualLoc, ExprTy *val) { 5278 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 5279 EnumConstantDecl *LastEnumConst = 5280 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 5281 Expr *Val = static_cast<Expr*>(val); 5282 5283 // The scope passed in may not be a decl scope. Zip up the scope tree until 5284 // we find one that is. 5285 S = getNonFieldDeclScope(S); 5286 5287 // Verify that there isn't already something declared with this name in this 5288 // scope. 5289 NamedDecl *PrevDecl = LookupSingleName(S, Id, LookupOrdinaryName); 5290 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5291 // Maybe we will complain about the shadowed template parameter. 5292 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 5293 // Just pretend that we didn't see the previous declaration. 5294 PrevDecl = 0; 5295 } 5296 5297 if (PrevDecl) { 5298 // When in C++, we may get a TagDecl with the same name; in this case the 5299 // enum constant will 'hide' the tag. 5300 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 5301 "Received TagDecl when not in C++!"); 5302 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 5303 if (isa<EnumConstantDecl>(PrevDecl)) 5304 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 5305 else 5306 Diag(IdLoc, diag::err_redefinition) << Id; 5307 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5308 if (Val) Val->Destroy(Context); 5309 return DeclPtrTy(); 5310 } 5311 } 5312 5313 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 5314 IdLoc, Id, Owned(Val)); 5315 5316 // Register this decl in the current scope stack. 5317 if (New) 5318 PushOnScopeChains(New, S); 5319 5320 return DeclPtrTy::make(New); 5321} 5322 5323void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 5324 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 5325 DeclPtrTy *Elements, unsigned NumElements, 5326 Scope *S, AttributeList *Attr) { 5327 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 5328 QualType EnumType = Context.getTypeDeclType(Enum); 5329 5330 if (Attr) 5331 ProcessDeclAttributeList(S, Enum, Attr); 5332 5333 // TODO: If the result value doesn't fit in an int, it must be a long or long 5334 // long value. ISO C does not support this, but GCC does as an extension, 5335 // emit a warning. 5336 unsigned IntWidth = Context.Target.getIntWidth(); 5337 unsigned CharWidth = Context.Target.getCharWidth(); 5338 unsigned ShortWidth = Context.Target.getShortWidth(); 5339 5340 // Verify that all the values are okay, compute the size of the values, and 5341 // reverse the list. 5342 unsigned NumNegativeBits = 0; 5343 unsigned NumPositiveBits = 0; 5344 5345 // Keep track of whether all elements have type int. 5346 bool AllElementsInt = true; 5347 5348 for (unsigned i = 0; i != NumElements; ++i) { 5349 EnumConstantDecl *ECD = 5350 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5351 if (!ECD) continue; // Already issued a diagnostic. 5352 5353 // If the enum value doesn't fit in an int, emit an extension warning. 5354 const llvm::APSInt &InitVal = ECD->getInitVal(); 5355 assert(InitVal.getBitWidth() >= IntWidth && 5356 "Should have promoted value to int"); 5357 if (InitVal.getBitWidth() > IntWidth) { 5358 llvm::APSInt V(InitVal); 5359 V.trunc(IntWidth); 5360 V.extend(InitVal.getBitWidth()); 5361 if (V != InitVal) 5362 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 5363 << InitVal.toString(10); 5364 } 5365 5366 // Keep track of the size of positive and negative values. 5367 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 5368 NumPositiveBits = std::max(NumPositiveBits, 5369 (unsigned)InitVal.getActiveBits()); 5370 else 5371 NumNegativeBits = std::max(NumNegativeBits, 5372 (unsigned)InitVal.getMinSignedBits()); 5373 5374 // Keep track of whether every enum element has type int (very commmon). 5375 if (AllElementsInt) 5376 AllElementsInt = ECD->getType() == Context.IntTy; 5377 } 5378 5379 // Figure out the type that should be used for this enum. 5380 // FIXME: Support -fshort-enums. 5381 QualType BestType; 5382 unsigned BestWidth; 5383 5384 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 5385 5386 if (NumNegativeBits) { 5387 // If there is a negative value, figure out the smallest integer type (of 5388 // int/long/longlong) that fits. 5389 // If it's packed, check also if it fits a char or a short. 5390 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 5391 BestType = Context.SignedCharTy; 5392 BestWidth = CharWidth; 5393 } else if (Packed && NumNegativeBits <= ShortWidth && 5394 NumPositiveBits < ShortWidth) { 5395 BestType = Context.ShortTy; 5396 BestWidth = ShortWidth; 5397 } 5398 else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 5399 BestType = Context.IntTy; 5400 BestWidth = IntWidth; 5401 } else { 5402 BestWidth = Context.Target.getLongWidth(); 5403 5404 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 5405 BestType = Context.LongTy; 5406 else { 5407 BestWidth = Context.Target.getLongLongWidth(); 5408 5409 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 5410 Diag(Enum->getLocation(), diag::warn_enum_too_large); 5411 BestType = Context.LongLongTy; 5412 } 5413 } 5414 } else { 5415 // If there is no negative value, figure out which of uint, ulong, ulonglong 5416 // fits. 5417 // If it's packed, check also if it fits a char or a short. 5418 if (Packed && NumPositiveBits <= CharWidth) { 5419 BestType = Context.UnsignedCharTy; 5420 BestWidth = CharWidth; 5421 } else if (Packed && NumPositiveBits <= ShortWidth) { 5422 BestType = Context.UnsignedShortTy; 5423 BestWidth = ShortWidth; 5424 } 5425 else if (NumPositiveBits <= IntWidth) { 5426 BestType = Context.UnsignedIntTy; 5427 BestWidth = IntWidth; 5428 } else if (NumPositiveBits <= 5429 (BestWidth = Context.Target.getLongWidth())) { 5430 BestType = Context.UnsignedLongTy; 5431 } else { 5432 BestWidth = Context.Target.getLongLongWidth(); 5433 assert(NumPositiveBits <= BestWidth && 5434 "How could an initializer get larger than ULL?"); 5435 BestType = Context.UnsignedLongLongTy; 5436 } 5437 } 5438 5439 // Loop over all of the enumerator constants, changing their types to match 5440 // the type of the enum if needed. 5441 for (unsigned i = 0; i != NumElements; ++i) { 5442 EnumConstantDecl *ECD = 5443 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5444 if (!ECD) continue; // Already issued a diagnostic. 5445 5446 // Standard C says the enumerators have int type, but we allow, as an 5447 // extension, the enumerators to be larger than int size. If each 5448 // enumerator value fits in an int, type it as an int, otherwise type it the 5449 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 5450 // that X has type 'int', not 'unsigned'. 5451 if (ECD->getType() == Context.IntTy) { 5452 // Make sure the init value is signed. 5453 llvm::APSInt IV = ECD->getInitVal(); 5454 IV.setIsSigned(true); 5455 ECD->setInitVal(IV); 5456 5457 if (getLangOptions().CPlusPlus) 5458 // C++ [dcl.enum]p4: Following the closing brace of an 5459 // enum-specifier, each enumerator has the type of its 5460 // enumeration. 5461 ECD->setType(EnumType); 5462 continue; // Already int type. 5463 } 5464 5465 // Determine whether the value fits into an int. 5466 llvm::APSInt InitVal = ECD->getInitVal(); 5467 bool FitsInInt; 5468 if (InitVal.isUnsigned() || !InitVal.isNegative()) 5469 FitsInInt = InitVal.getActiveBits() < IntWidth; 5470 else 5471 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 5472 5473 // If it fits into an integer type, force it. Otherwise force it to match 5474 // the enum decl type. 5475 QualType NewTy; 5476 unsigned NewWidth; 5477 bool NewSign; 5478 if (FitsInInt) { 5479 NewTy = Context.IntTy; 5480 NewWidth = IntWidth; 5481 NewSign = true; 5482 } else if (ECD->getType() == BestType) { 5483 // Already the right type! 5484 if (getLangOptions().CPlusPlus) 5485 // C++ [dcl.enum]p4: Following the closing brace of an 5486 // enum-specifier, each enumerator has the type of its 5487 // enumeration. 5488 ECD->setType(EnumType); 5489 continue; 5490 } else { 5491 NewTy = BestType; 5492 NewWidth = BestWidth; 5493 NewSign = BestType->isSignedIntegerType(); 5494 } 5495 5496 // Adjust the APSInt value. 5497 InitVal.extOrTrunc(NewWidth); 5498 InitVal.setIsSigned(NewSign); 5499 ECD->setInitVal(InitVal); 5500 5501 // Adjust the Expr initializer and type. 5502 if (ECD->getInitExpr()) 5503 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, 5504 CastExpr::CK_Unknown, 5505 ECD->getInitExpr(), 5506 /*isLvalue=*/false)); 5507 if (getLangOptions().CPlusPlus) 5508 // C++ [dcl.enum]p4: Following the closing brace of an 5509 // enum-specifier, each enumerator has the type of its 5510 // enumeration. 5511 ECD->setType(EnumType); 5512 else 5513 ECD->setType(NewTy); 5514 } 5515 5516 Enum->completeDefinition(Context, BestType); 5517} 5518 5519Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 5520 ExprArg expr) { 5521 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 5522 5523 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 5524 Loc, AsmString); 5525 CurContext->addDecl(New); 5526 return DeclPtrTy::make(New); 5527} 5528 5529void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 5530 SourceLocation PragmaLoc, 5531 SourceLocation NameLoc) { 5532 Decl *PrevDecl = LookupSingleName(TUScope, Name, LookupOrdinaryName); 5533 5534 if (PrevDecl) { 5535 PrevDecl->addAttr(::new (Context) WeakAttr()); 5536 } else { 5537 (void)WeakUndeclaredIdentifiers.insert( 5538 std::pair<IdentifierInfo*,WeakInfo> 5539 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 5540 } 5541} 5542 5543void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 5544 IdentifierInfo* AliasName, 5545 SourceLocation PragmaLoc, 5546 SourceLocation NameLoc, 5547 SourceLocation AliasNameLoc) { 5548 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, LookupOrdinaryName); 5549 WeakInfo W = WeakInfo(Name, NameLoc); 5550 5551 if (PrevDecl) { 5552 if (!PrevDecl->hasAttr<AliasAttr>()) 5553 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 5554 DeclApplyPragmaWeak(TUScope, ND, W); 5555 } else { 5556 (void)WeakUndeclaredIdentifiers.insert( 5557 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 5558 } 5559} 5560