SemaDecl.cpp revision 1f15e768983a614e45c3ca01df1ddb3339e746dd
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 "SemaInherit.h" 16#include "clang/AST/APValue.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/Analysis/CFG.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/TargetInfo.h" 27#include "clang/Basic/SourceManager.h" 28// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 29#include "clang/Lex/Preprocessor.h" 30#include "clang/Lex/HeaderSearch.h" 31#include "llvm/ADT/BitVector.h" 32#include "llvm/ADT/SmallSet.h" 33#include "llvm/ADT/STLExtras.h" 34#include <algorithm> 35#include <functional> 36#include <queue> 37using namespace clang; 38 39/// getDeclName - Return a pretty name for the specified decl if possible, or 40/// an empty string if not. This is used for pretty crash reporting. 41std::string Sema::getDeclName(DeclPtrTy d) { 42 Decl *D = d.getAs<Decl>(); 43 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 44 return DN->getQualifiedNameAsString(); 45 return ""; 46} 47 48Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) { 49 return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>())); 50} 51 52/// \brief If the identifier refers to a type name within this scope, 53/// return the declaration of that type. 54/// 55/// This routine performs ordinary name lookup of the identifier II 56/// within the given scope, with optional C++ scope specifier SS, to 57/// determine whether the name refers to a type. If so, returns an 58/// opaque pointer (actually a QualType) corresponding to that 59/// type. Otherwise, returns NULL. 60/// 61/// If name lookup results in an ambiguity, this routine will complain 62/// and then return NULL. 63Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 64 Scope *S, const CXXScopeSpec *SS) { 65 // C++ [temp.res]p3: 66 // A qualified-id that refers to a type and in which the 67 // nested-name-specifier depends on a template-parameter (14.6.2) 68 // shall be prefixed by the keyword typename to indicate that the 69 // qualified-id denotes a type, forming an 70 // elaborated-type-specifier (7.1.5.3). 71 // 72 // We therefore do not perform any name lookup if the result would 73 // refer to a member of an unknown specialization. 74 if (SS && isUnknownSpecialization(*SS)) 75 return 0; 76 77 LookupResult Result 78 = LookupParsedName(S, SS, &II, LookupOrdinaryName, false, false); 79 80 NamedDecl *IIDecl = 0; 81 switch (Result.getKind()) { 82 case LookupResult::NotFound: 83 case LookupResult::FoundOverloaded: 84 return 0; 85 86 case LookupResult::AmbiguousBaseSubobjectTypes: 87 case LookupResult::AmbiguousBaseSubobjects: 88 case LookupResult::AmbiguousReference: { 89 // Look to see if we have a type anywhere in the list of results. 90 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 91 Res != ResEnd; ++Res) { 92 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 93 if (!IIDecl || 94 (*Res)->getLocation().getRawEncoding() < 95 IIDecl->getLocation().getRawEncoding()) 96 IIDecl = *Res; 97 } 98 } 99 100 if (!IIDecl) { 101 // None of the entities we found is a type, so there is no way 102 // to even assume that the result is a type. In this case, don't 103 // complain about the ambiguity. The parser will either try to 104 // perform this lookup again (e.g., as an object name), which 105 // will produce the ambiguity, or will complain that it expected 106 // a type name. 107 Result.Destroy(); 108 return 0; 109 } 110 111 // We found a type within the ambiguous lookup; diagnose the 112 // ambiguity and then return that type. This might be the right 113 // answer, or it might not be, but it suppresses any attempt to 114 // perform the name lookup again. 115 DiagnoseAmbiguousLookup(Result, DeclarationName(&II), NameLoc); 116 break; 117 } 118 119 case LookupResult::Found: 120 IIDecl = Result.getAsDecl(); 121 break; 122 } 123 124 if (IIDecl) { 125 QualType T; 126 127 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 128 // Check whether we can use this type 129 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 130 131 if (getLangOptions().CPlusPlus) { 132 // C++ [temp.local]p2: 133 // Within the scope of a class template specialization or 134 // partial specialization, when the injected-class-name is 135 // not followed by a <, it is equivalent to the 136 // injected-class-name followed by the template-argument s 137 // of the class template specialization or partial 138 // specialization enclosed in <>. 139 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) 140 if (RD->isInjectedClassName()) 141 if (ClassTemplateDecl *Template = RD->getDescribedClassTemplate()) 142 T = Template->getInjectedClassNameType(Context); 143 } 144 145 if (T.isNull()) 146 T = Context.getTypeDeclType(TD); 147 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 148 // Check whether we can use this interface. 149 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 150 151 T = Context.getObjCInterfaceType(IDecl); 152 } else 153 return 0; 154 155 if (SS) 156 T = getQualifiedNameType(*SS, T); 157 158 return T.getAsOpaquePtr(); 159 } 160 161 return 0; 162} 163 164/// isTagName() - This method is called *for error recovery purposes only* 165/// to determine if the specified name is a valid tag name ("struct foo"). If 166/// so, this returns the TST for the tag corresponding to it (TST_enum, 167/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 168/// where the user forgot to specify the tag. 169DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 170 // Do a tag name lookup in this scope. 171 LookupResult R = LookupName(S, &II, LookupTagName, false, false); 172 if (R.getKind() == LookupResult::Found) 173 if (const TagDecl *TD = dyn_cast<TagDecl>(R.getAsDecl())) { 174 switch (TD->getTagKind()) { 175 case TagDecl::TK_struct: return DeclSpec::TST_struct; 176 case TagDecl::TK_union: return DeclSpec::TST_union; 177 case TagDecl::TK_class: return DeclSpec::TST_class; 178 case TagDecl::TK_enum: return DeclSpec::TST_enum; 179 } 180 } 181 182 return DeclSpec::TST_unspecified; 183} 184 185 186 187DeclContext *Sema::getContainingDC(DeclContext *DC) { 188 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) { 189 // A C++ out-of-line method will return to the file declaration context. 190 if (MD->isOutOfLine()) 191 return MD->getLexicalDeclContext(); 192 193 // A C++ inline method is parsed *after* the topmost class it was declared 194 // in is fully parsed (it's "complete"). 195 // The parsing of a C++ inline method happens at the declaration context of 196 // the topmost (non-nested) class it is lexically declared in. 197 assert(isa<CXXRecordDecl>(MD->getParent()) && "C++ method not in Record."); 198 DC = MD->getParent(); 199 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 200 DC = RD; 201 202 // Return the declaration context of the topmost class the inline method is 203 // declared in. 204 return DC; 205 } 206 207 if (isa<ObjCMethodDecl>(DC)) 208 return Context.getTranslationUnitDecl(); 209 210 return DC->getLexicalParent(); 211} 212 213void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 214 assert(getContainingDC(DC) == CurContext && 215 "The next DeclContext should be lexically contained in the current one."); 216 CurContext = DC; 217 S->setEntity(DC); 218} 219 220void Sema::PopDeclContext() { 221 assert(CurContext && "DeclContext imbalance!"); 222 223 CurContext = getContainingDC(CurContext); 224} 225 226/// EnterDeclaratorContext - Used when we must lookup names in the context 227/// of a declarator's nested name specifier. 228void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 229 assert(PreDeclaratorDC == 0 && "Previous declarator context not popped?"); 230 PreDeclaratorDC = static_cast<DeclContext*>(S->getEntity()); 231 CurContext = DC; 232 assert(CurContext && "No context?"); 233 S->setEntity(CurContext); 234} 235 236void Sema::ExitDeclaratorContext(Scope *S) { 237 S->setEntity(PreDeclaratorDC); 238 PreDeclaratorDC = 0; 239 240 // Reset CurContext to the nearest enclosing context. 241 while (!S->getEntity() && S->getParent()) 242 S = S->getParent(); 243 CurContext = static_cast<DeclContext*>(S->getEntity()); 244 assert(CurContext && "No context?"); 245} 246 247/// \brief Determine whether we allow overloading of the function 248/// PrevDecl with another declaration. 249/// 250/// This routine determines whether overloading is possible, not 251/// whether some new function is actually an overload. It will return 252/// true in C++ (where we can always provide overloads) or, as an 253/// extension, in C when the previous function is already an 254/// overloaded function declaration or has the "overloadable" 255/// attribute. 256static bool AllowOverloadingOfFunction(Decl *PrevDecl, ASTContext &Context) { 257 if (Context.getLangOptions().CPlusPlus) 258 return true; 259 260 if (isa<OverloadedFunctionDecl>(PrevDecl)) 261 return true; 262 263 return PrevDecl->getAttr<OverloadableAttr>() != 0; 264} 265 266/// Add this decl to the scope shadowed decl chains. 267void Sema::PushOnScopeChains(NamedDecl *D, Scope *S) { 268 // Move up the scope chain until we find the nearest enclosing 269 // non-transparent context. The declaration will be introduced into this 270 // scope. 271 while (S->getEntity() && 272 ((DeclContext *)S->getEntity())->isTransparentContext()) 273 S = S->getParent(); 274 275 S->AddDecl(DeclPtrTy::make(D)); 276 277 // Add scoped declarations into their context, so that they can be 278 // found later. Declarations without a context won't be inserted 279 // into any context. 280 CurContext->addDecl(D); 281 282 // C++ [basic.scope]p4: 283 // -- exactly one declaration shall declare a class name or 284 // enumeration name that is not a typedef name and the other 285 // declarations shall all refer to the same object or 286 // enumerator, or all refer to functions and function templates; 287 // in this case the class name or enumeration name is hidden. 288 if (TagDecl *TD = dyn_cast<TagDecl>(D)) { 289 // We are pushing the name of a tag (enum or class). 290 if (CurContext->getLookupContext() 291 == TD->getDeclContext()->getLookupContext()) { 292 // We're pushing the tag into the current context, which might 293 // require some reshuffling in the identifier resolver. 294 IdentifierResolver::iterator 295 I = IdResolver.begin(TD->getDeclName()), 296 IEnd = IdResolver.end(); 297 if (I != IEnd && isDeclInScope(*I, CurContext, S)) { 298 NamedDecl *PrevDecl = *I; 299 for (; I != IEnd && isDeclInScope(*I, CurContext, S); 300 PrevDecl = *I, ++I) { 301 if (TD->declarationReplaces(*I)) { 302 // This is a redeclaration. Remove it from the chain and 303 // break out, so that we'll add in the shadowed 304 // declaration. 305 S->RemoveDecl(DeclPtrTy::make(*I)); 306 if (PrevDecl == *I) { 307 IdResolver.RemoveDecl(*I); 308 IdResolver.AddDecl(TD); 309 return; 310 } else { 311 IdResolver.RemoveDecl(*I); 312 break; 313 } 314 } 315 } 316 317 // There is already a declaration with the same name in the same 318 // scope, which is not a tag declaration. It must be found 319 // before we find the new declaration, so insert the new 320 // declaration at the end of the chain. 321 IdResolver.AddShadowedDecl(TD, PrevDecl); 322 323 return; 324 } 325 } 326 } else if ((isa<FunctionDecl>(D) && 327 AllowOverloadingOfFunction(D, Context)) || 328 isa<FunctionTemplateDecl>(D)) { 329 // We are pushing the name of a function or function template, 330 // which might be an overloaded name. 331 IdentifierResolver::iterator Redecl 332 = std::find_if(IdResolver.begin(D->getDeclName()), 333 IdResolver.end(), 334 std::bind1st(std::mem_fun(&NamedDecl::declarationReplaces), 335 D)); 336 if (Redecl != IdResolver.end() && 337 S->isDeclScope(DeclPtrTy::make(*Redecl))) { 338 // There is already a declaration of a function on our 339 // IdResolver chain. Replace it with this declaration. 340 S->RemoveDecl(DeclPtrTy::make(*Redecl)); 341 IdResolver.RemoveDecl(*Redecl); 342 } 343 } else if (isa<ObjCInterfaceDecl>(D)) { 344 // We're pushing an Objective-C interface into the current 345 // context. If there is already an alias declaration, remove it first. 346 for (IdentifierResolver::iterator 347 I = IdResolver.begin(D->getDeclName()), IEnd = IdResolver.end(); 348 I != IEnd; ++I) { 349 if (isa<ObjCCompatibleAliasDecl>(*I)) { 350 S->RemoveDecl(DeclPtrTy::make(*I)); 351 IdResolver.RemoveDecl(*I); 352 break; 353 } 354 } 355 } 356 357 IdResolver.AddDecl(D); 358} 359 360void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 361 if (S->decl_empty()) return; 362 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 363 "Scope shouldn't contain decls!"); 364 365 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 366 I != E; ++I) { 367 Decl *TmpD = (*I).getAs<Decl>(); 368 assert(TmpD && "This decl didn't get pushed??"); 369 370 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 371 NamedDecl *D = cast<NamedDecl>(TmpD); 372 373 if (!D->getDeclName()) continue; 374 375 // Remove this name from our lexical scope. 376 IdResolver.RemoveDecl(D); 377 } 378} 379 380/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 381/// return 0 if one not found. 382ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 383 // The third "scope" argument is 0 since we aren't enabling lazy built-in 384 // creation from this context. 385 NamedDecl *IDecl = LookupName(TUScope, Id, LookupOrdinaryName); 386 387 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 388} 389 390/// getNonFieldDeclScope - Retrieves the innermost scope, starting 391/// from S, where a non-field would be declared. This routine copes 392/// with the difference between C and C++ scoping rules in structs and 393/// unions. For example, the following code is well-formed in C but 394/// ill-formed in C++: 395/// @code 396/// struct S6 { 397/// enum { BAR } e; 398/// }; 399/// 400/// void test_S6() { 401/// struct S6 a; 402/// a.e = BAR; 403/// } 404/// @endcode 405/// For the declaration of BAR, this routine will return a different 406/// scope. The scope S will be the scope of the unnamed enumeration 407/// within S6. In C++, this routine will return the scope associated 408/// with S6, because the enumeration's scope is a transparent 409/// context but structures can contain non-field names. In C, this 410/// routine will return the translation unit scope, since the 411/// enumeration's scope is a transparent context and structures cannot 412/// contain non-field names. 413Scope *Sema::getNonFieldDeclScope(Scope *S) { 414 while (((S->getFlags() & Scope::DeclScope) == 0) || 415 (S->getEntity() && 416 ((DeclContext *)S->getEntity())->isTransparentContext()) || 417 (S->isClassScope() && !getLangOptions().CPlusPlus)) 418 S = S->getParent(); 419 return S; 420} 421 422void Sema::InitBuiltinVaListType() { 423 if (!Context.getBuiltinVaListType().isNull()) 424 return; 425 426 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 427 NamedDecl *VaDecl = LookupName(TUScope, VaIdent, LookupOrdinaryName); 428 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 429 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 430} 431 432/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 433/// file scope. lazily create a decl for it. ForRedeclaration is true 434/// if we're creating this built-in in anticipation of redeclaring the 435/// built-in. 436NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 437 Scope *S, bool ForRedeclaration, 438 SourceLocation Loc) { 439 Builtin::ID BID = (Builtin::ID)bid; 440 441 if (Context.BuiltinInfo.hasVAListUse(BID)) 442 InitBuiltinVaListType(); 443 444 ASTContext::GetBuiltinTypeError Error; 445 QualType R = Context.GetBuiltinType(BID, Error); 446 switch (Error) { 447 case ASTContext::GE_None: 448 // Okay 449 break; 450 451 case ASTContext::GE_Missing_FILE: 452 if (ForRedeclaration) 453 Diag(Loc, diag::err_implicit_decl_requires_stdio) 454 << Context.BuiltinInfo.GetName(BID); 455 return 0; 456 } 457 458 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 459 Diag(Loc, diag::ext_implicit_lib_function_decl) 460 << Context.BuiltinInfo.GetName(BID) 461 << R; 462 if (Context.BuiltinInfo.getHeaderName(BID) && 463 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 464 != Diagnostic::Ignored) 465 Diag(Loc, diag::note_please_include_header) 466 << Context.BuiltinInfo.getHeaderName(BID) 467 << Context.BuiltinInfo.GetName(BID); 468 } 469 470 FunctionDecl *New = FunctionDecl::Create(Context, 471 Context.getTranslationUnitDecl(), 472 Loc, II, R, 473 FunctionDecl::Extern, false, 474 /*hasPrototype=*/true); 475 New->setImplicit(); 476 477 // Create Decl objects for each parameter, adding them to the 478 // FunctionDecl. 479 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 480 llvm::SmallVector<ParmVarDecl*, 16> Params; 481 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 482 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 483 FT->getArgType(i), VarDecl::None, 0)); 484 New->setParams(Context, Params.data(), Params.size()); 485 } 486 487 AddKnownFunctionAttributes(New); 488 489 // TUScope is the translation-unit scope to insert this function into. 490 // FIXME: This is hideous. We need to teach PushOnScopeChains to 491 // relate Scopes to DeclContexts, and probably eliminate CurContext 492 // entirely, but we're not there yet. 493 DeclContext *SavedContext = CurContext; 494 CurContext = Context.getTranslationUnitDecl(); 495 PushOnScopeChains(New, TUScope); 496 CurContext = SavedContext; 497 return New; 498} 499 500/// GetStdNamespace - This method gets the C++ "std" namespace. This is where 501/// everything from the standard library is defined. 502NamespaceDecl *Sema::GetStdNamespace() { 503 if (!StdNamespace) { 504 IdentifierInfo *StdIdent = &PP.getIdentifierTable().get("std"); 505 DeclContext *Global = Context.getTranslationUnitDecl(); 506 Decl *Std = LookupQualifiedName(Global, StdIdent, LookupNamespaceName); 507 StdNamespace = dyn_cast_or_null<NamespaceDecl>(Std); 508 } 509 return StdNamespace; 510} 511 512/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 513/// same name and scope as a previous declaration 'Old'. Figure out 514/// how to resolve this situation, merging decls or emitting 515/// diagnostics as appropriate. If there was an error, set New to be invalid. 516/// 517void Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 518 // If either decl is known invalid already, set the new one to be invalid and 519 // don't bother doing any merging checks. 520 if (New->isInvalidDecl() || OldD->isInvalidDecl()) 521 return New->setInvalidDecl(); 522 523 // Allow multiple definitions for ObjC built-in typedefs. 524 // FIXME: Verify the underlying types are equivalent! 525 if (getLangOptions().ObjC1) { 526 const IdentifierInfo *TypeID = New->getIdentifier(); 527 switch (TypeID->getLength()) { 528 default: break; 529 case 2: 530 if (!TypeID->isStr("id")) 531 break; 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 // Install the built-in type for 'Class', ignoring the current definition. 539 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 540 return; 541 case 3: 542 if (!TypeID->isStr("SEL")) 543 break; 544 Context.setObjCSelType(Context.getTypeDeclType(New)); 545 return; 546 case 8: 547 if (!TypeID->isStr("Protocol")) 548 break; 549 Context.setObjCProtoType(New->getUnderlyingType()); 550 return; 551 } 552 // Fall through - the typedef name was not a builtin type. 553 } 554 // Verify the old decl was also a type. 555 TypeDecl *Old = dyn_cast<TypeDecl>(OldD); 556 if (!Old) { 557 Diag(New->getLocation(), diag::err_redefinition_different_kind) 558 << New->getDeclName(); 559 if (OldD->getLocation().isValid()) 560 Diag(OldD->getLocation(), diag::note_previous_definition); 561 return New->setInvalidDecl(); 562 } 563 564 // Determine the "old" type we'll use for checking and diagnostics. 565 QualType OldType; 566 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 567 OldType = OldTypedef->getUnderlyingType(); 568 else 569 OldType = Context.getTypeDeclType(Old); 570 571 // If the typedef types are not identical, reject them in all languages and 572 // with any extensions enabled. 573 574 if (OldType != New->getUnderlyingType() && 575 Context.getCanonicalType(OldType) != 576 Context.getCanonicalType(New->getUnderlyingType())) { 577 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 578 << New->getUnderlyingType() << OldType; 579 if (Old->getLocation().isValid()) 580 Diag(Old->getLocation(), diag::note_previous_definition); 581 return New->setInvalidDecl(); 582 } 583 584 if (getLangOptions().Microsoft) 585 return; 586 587 // C++ [dcl.typedef]p2: 588 // In a given non-class scope, a typedef specifier can be used to 589 // redefine the name of any type declared in that scope to refer 590 // to the type to which it already refers. 591 if (getLangOptions().CPlusPlus) { 592 if (!isa<CXXRecordDecl>(CurContext)) 593 return; 594 Diag(New->getLocation(), diag::err_redefinition) 595 << New->getDeclName(); 596 Diag(Old->getLocation(), diag::note_previous_definition); 597 return New->setInvalidDecl(); 598 } 599 600 // If we have a redefinition of a typedef in C, emit a warning. This warning 601 // is normally mapped to an error, but can be controlled with 602 // -Wtypedef-redefinition. If either the original or the redefinition is 603 // in a system header, don't emit this for compatibility with GCC. 604 if (PP.getDiagnostics().getSuppressSystemWarnings() && 605 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 606 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 607 return; 608 609 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 610 << New->getDeclName(); 611 Diag(Old->getLocation(), diag::note_previous_definition); 612 return; 613} 614 615/// DeclhasAttr - returns true if decl Declaration already has the target 616/// attribute. 617static bool 618DeclHasAttr(const Decl *decl, const Attr *target) { 619 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 620 if (attr->getKind() == target->getKind()) 621 return true; 622 623 return false; 624} 625 626/// MergeAttributes - append attributes from the Old decl to the New one. 627static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 628 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 629 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 630 Attr *NewAttr = attr->clone(C); 631 NewAttr->setInherited(true); 632 New->addAttr(NewAttr); 633 } 634 } 635} 636 637/// Used in MergeFunctionDecl to keep track of function parameters in 638/// C. 639struct GNUCompatibleParamWarning { 640 ParmVarDecl *OldParm; 641 ParmVarDecl *NewParm; 642 QualType PromotedType; 643}; 644 645/// MergeFunctionDecl - We just parsed a function 'New' from 646/// declarator D which has the same name and scope as a previous 647/// declaration 'Old'. Figure out how to resolve this situation, 648/// merging decls or emitting diagnostics as appropriate. 649/// 650/// In C++, New and Old must be declarations that are not 651/// overloaded. Use IsOverload to determine whether New and Old are 652/// overloaded, and to select the Old declaration that New should be 653/// merged with. 654/// 655/// Returns true if there was an error, false otherwise. 656bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 657 assert(!isa<OverloadedFunctionDecl>(OldD) && 658 "Cannot merge with an overloaded function declaration"); 659 660 // Verify the old decl was also a function. 661 FunctionDecl *Old = 0; 662 if (FunctionTemplateDecl *OldFunctionTemplate 663 = dyn_cast<FunctionTemplateDecl>(OldD)) 664 Old = OldFunctionTemplate->getTemplatedDecl(); 665 else 666 Old = dyn_cast<FunctionDecl>(OldD); 667 if (!Old) { 668 Diag(New->getLocation(), diag::err_redefinition_different_kind) 669 << New->getDeclName(); 670 Diag(OldD->getLocation(), diag::note_previous_definition); 671 return true; 672 } 673 674 // Determine whether the previous declaration was a definition, 675 // implicit declaration, or a declaration. 676 diag::kind PrevDiag; 677 if (Old->isThisDeclarationADefinition()) 678 PrevDiag = diag::note_previous_definition; 679 else if (Old->isImplicit()) 680 PrevDiag = diag::note_previous_implicit_declaration; 681 else 682 PrevDiag = diag::note_previous_declaration; 683 684 QualType OldQType = Context.getCanonicalType(Old->getType()); 685 QualType NewQType = Context.getCanonicalType(New->getType()); 686 687 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 688 New->getStorageClass() == FunctionDecl::Static && 689 Old->getStorageClass() != FunctionDecl::Static) { 690 Diag(New->getLocation(), diag::err_static_non_static) 691 << New; 692 Diag(Old->getLocation(), PrevDiag); 693 return true; 694 } 695 696 if (getLangOptions().CPlusPlus) { 697 // (C++98 13.1p2): 698 // Certain function declarations cannot be overloaded: 699 // -- Function declarations that differ only in the return type 700 // cannot be overloaded. 701 QualType OldReturnType 702 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 703 QualType NewReturnType 704 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 705 if (OldReturnType != NewReturnType) { 706 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 707 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 708 return true; 709 } 710 711 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 712 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 713 if (OldMethod && NewMethod && 714 NewMethod->getLexicalDeclContext()->isRecord()) { 715 // -- Member function declarations with the same name and the 716 // same parameter types cannot be overloaded if any of them 717 // is a static member function declaration. 718 if (OldMethod->isStatic() || NewMethod->isStatic()) { 719 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 720 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 721 return true; 722 } 723 724 // C++ [class.mem]p1: 725 // [...] A member shall not be declared twice in the 726 // member-specification, except that a nested class or member 727 // class template can be declared and then later defined. 728 unsigned NewDiag; 729 if (isa<CXXConstructorDecl>(OldMethod)) 730 NewDiag = diag::err_constructor_redeclared; 731 else if (isa<CXXDestructorDecl>(NewMethod)) 732 NewDiag = diag::err_destructor_redeclared; 733 else if (isa<CXXConversionDecl>(NewMethod)) 734 NewDiag = diag::err_conv_function_redeclared; 735 else 736 NewDiag = diag::err_member_redeclared; 737 738 Diag(New->getLocation(), NewDiag); 739 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 740 } 741 742 // (C++98 8.3.5p3): 743 // All declarations for a function shall agree exactly in both the 744 // return type and the parameter-type-list. 745 if (OldQType == NewQType) 746 return MergeCompatibleFunctionDecls(New, Old); 747 748 // Fall through for conflicting redeclarations and redefinitions. 749 } 750 751 // C: Function types need to be compatible, not identical. This handles 752 // duplicate function decls like "void f(int); void f(enum X);" properly. 753 if (!getLangOptions().CPlusPlus && 754 Context.typesAreCompatible(OldQType, NewQType)) { 755 const FunctionType *OldFuncType = OldQType->getAsFunctionType(); 756 const FunctionType *NewFuncType = NewQType->getAsFunctionType(); 757 const FunctionProtoType *OldProto = 0; 758 if (isa<FunctionNoProtoType>(NewFuncType) && 759 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 760 // The old declaration provided a function prototype, but the 761 // new declaration does not. Merge in the prototype. 762 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 763 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 764 OldProto->arg_type_end()); 765 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 766 ParamTypes.data(), ParamTypes.size(), 767 OldProto->isVariadic(), 768 OldProto->getTypeQuals()); 769 New->setType(NewQType); 770 New->setHasInheritedPrototype(); 771 772 // Synthesize a parameter for each argument type. 773 llvm::SmallVector<ParmVarDecl*, 16> Params; 774 for (FunctionProtoType::arg_type_iterator 775 ParamType = OldProto->arg_type_begin(), 776 ParamEnd = OldProto->arg_type_end(); 777 ParamType != ParamEnd; ++ParamType) { 778 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 779 SourceLocation(), 0, 780 *ParamType, VarDecl::None, 781 0); 782 Param->setImplicit(); 783 Params.push_back(Param); 784 } 785 786 New->setParams(Context, Params.data(), Params.size()); 787 } 788 789 return MergeCompatibleFunctionDecls(New, Old); 790 } 791 792 // GNU C permits a K&R definition to follow a prototype declaration 793 // if the declared types of the parameters in the K&R definition 794 // match the types in the prototype declaration, even when the 795 // promoted types of the parameters from the K&R definition differ 796 // from the types in the prototype. GCC then keeps the types from 797 // the prototype. 798 // 799 // If a variadic prototype is followed by a non-variadic K&R definition, 800 // the K&R definition becomes variadic. This is sort of an edge case, but 801 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 802 // C99 6.9.1p8. 803 if (!getLangOptions().CPlusPlus && 804 Old->hasPrototype() && !New->hasPrototype() && 805 New->getType()->getAsFunctionProtoType() && 806 Old->getNumParams() == New->getNumParams()) { 807 llvm::SmallVector<QualType, 16> ArgTypes; 808 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 809 const FunctionProtoType *OldProto 810 = Old->getType()->getAsFunctionProtoType(); 811 const FunctionProtoType *NewProto 812 = New->getType()->getAsFunctionProtoType(); 813 814 // Determine whether this is the GNU C extension. 815 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 816 NewProto->getResultType()); 817 bool LooseCompatible = !MergedReturn.isNull(); 818 for (unsigned Idx = 0, End = Old->getNumParams(); 819 LooseCompatible && Idx != End; ++Idx) { 820 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 821 ParmVarDecl *NewParm = New->getParamDecl(Idx); 822 if (Context.typesAreCompatible(OldParm->getType(), 823 NewProto->getArgType(Idx))) { 824 ArgTypes.push_back(NewParm->getType()); 825 } else if (Context.typesAreCompatible(OldParm->getType(), 826 NewParm->getType())) { 827 GNUCompatibleParamWarning Warn 828 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 829 Warnings.push_back(Warn); 830 ArgTypes.push_back(NewParm->getType()); 831 } else 832 LooseCompatible = false; 833 } 834 835 if (LooseCompatible) { 836 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 837 Diag(Warnings[Warn].NewParm->getLocation(), 838 diag::ext_param_promoted_not_compatible_with_prototype) 839 << Warnings[Warn].PromotedType 840 << Warnings[Warn].OldParm->getType(); 841 Diag(Warnings[Warn].OldParm->getLocation(), 842 diag::note_previous_declaration); 843 } 844 845 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 846 ArgTypes.size(), 847 OldProto->isVariadic(), 0)); 848 return MergeCompatibleFunctionDecls(New, Old); 849 } 850 851 // Fall through to diagnose conflicting types. 852 } 853 854 // A function that has already been declared has been redeclared or defined 855 // with a different type- show appropriate diagnostic 856 if (unsigned BuiltinID = Old->getBuiltinID(Context)) { 857 // The user has declared a builtin function with an incompatible 858 // signature. 859 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 860 // The function the user is redeclaring is a library-defined 861 // function like 'malloc' or 'printf'. Warn about the 862 // redeclaration, then pretend that we don't know about this 863 // library built-in. 864 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 865 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 866 << Old << Old->getType(); 867 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 868 Old->setInvalidDecl(); 869 return false; 870 } 871 872 PrevDiag = diag::note_previous_builtin_declaration; 873 } 874 875 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 876 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 877 return true; 878} 879 880/// \brief Completes the merge of two function declarations that are 881/// known to be compatible. 882/// 883/// This routine handles the merging of attributes and other 884/// properties of function declarations form the old declaration to 885/// the new declaration, once we know that New is in fact a 886/// redeclaration of Old. 887/// 888/// \returns false 889bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 890 // Merge the attributes 891 MergeAttributes(New, Old, Context); 892 893 // Merge the storage class. 894 if (Old->getStorageClass() != FunctionDecl::Extern) 895 New->setStorageClass(Old->getStorageClass()); 896 897 // Merge "inline" 898 if (Old->isInline()) 899 New->setInline(true); 900 901 // If this function declaration by itself qualifies as a C99 inline 902 // definition (C99 6.7.4p6), but the previous definition did not, 903 // then the function is not a C99 inline definition. 904 if (New->isC99InlineDefinition() && !Old->isC99InlineDefinition()) 905 New->setC99InlineDefinition(false); 906 else if (Old->isC99InlineDefinition() && !New->isC99InlineDefinition()) { 907 // Mark all preceding definitions as not being C99 inline definitions. 908 for (const FunctionDecl *Prev = Old; Prev; 909 Prev = Prev->getPreviousDeclaration()) 910 const_cast<FunctionDecl *>(Prev)->setC99InlineDefinition(false); 911 } 912 913 // Merge "pure" flag. 914 if (Old->isPure()) 915 New->setPure(); 916 917 // Merge the "deleted" flag. 918 if (Old->isDeleted()) 919 New->setDeleted(); 920 921 if (getLangOptions().CPlusPlus) 922 return MergeCXXFunctionDecl(New, Old); 923 924 return false; 925} 926 927/// MergeVarDecl - We just parsed a variable 'New' which has the same name 928/// and scope as a previous declaration 'Old'. Figure out how to resolve this 929/// situation, merging decls or emitting diagnostics as appropriate. 930/// 931/// Tentative definition rules (C99 6.9.2p2) are checked by 932/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 933/// definitions here, since the initializer hasn't been attached. 934/// 935void Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 936 // If either decl is invalid, make sure the new one is marked invalid and 937 // don't do any other checking. 938 if (New->isInvalidDecl() || OldD->isInvalidDecl()) 939 return New->setInvalidDecl(); 940 941 // Verify the old decl was also a variable. 942 VarDecl *Old = dyn_cast<VarDecl>(OldD); 943 if (!Old) { 944 Diag(New->getLocation(), diag::err_redefinition_different_kind) 945 << New->getDeclName(); 946 Diag(OldD->getLocation(), diag::note_previous_definition); 947 return New->setInvalidDecl(); 948 } 949 950 MergeAttributes(New, Old, Context); 951 952 // Merge the types 953 QualType MergedT; 954 if (getLangOptions().CPlusPlus) { 955 if (Context.hasSameType(New->getType(), Old->getType())) 956 MergedT = New->getType(); 957 } else { 958 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 959 } 960 if (MergedT.isNull()) { 961 Diag(New->getLocation(), diag::err_redefinition_different_type) 962 << New->getDeclName(); 963 Diag(Old->getLocation(), diag::note_previous_definition); 964 return New->setInvalidDecl(); 965 } 966 New->setType(MergedT); 967 968 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 969 if (New->getStorageClass() == VarDecl::Static && 970 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 971 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 972 Diag(Old->getLocation(), diag::note_previous_definition); 973 return New->setInvalidDecl(); 974 } 975 // C99 6.2.2p4: 976 // For an identifier declared with the storage-class specifier 977 // extern in a scope in which a prior declaration of that 978 // identifier is visible,23) if the prior declaration specifies 979 // internal or external linkage, the linkage of the identifier at 980 // the later declaration is the same as the linkage specified at 981 // the prior declaration. If no prior declaration is visible, or 982 // if the prior declaration specifies no linkage, then the 983 // identifier has external linkage. 984 if (New->hasExternalStorage() && Old->hasLinkage()) 985 /* Okay */; 986 else if (New->getStorageClass() != VarDecl::Static && 987 Old->getStorageClass() == VarDecl::Static) { 988 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 989 Diag(Old->getLocation(), diag::note_previous_definition); 990 return New->setInvalidDecl(); 991 } 992 993 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 994 995 // FIXME: The test for external storage here seems wrong? We still 996 // need to check for mismatches. 997 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 998 // Don't complain about out-of-line definitions of static members. 999 !(Old->getLexicalDeclContext()->isRecord() && 1000 !New->getLexicalDeclContext()->isRecord())) { 1001 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1002 Diag(Old->getLocation(), diag::note_previous_definition); 1003 return New->setInvalidDecl(); 1004 } 1005 1006 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1007 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1008 Diag(Old->getLocation(), diag::note_previous_definition); 1009 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1010 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1011 Diag(Old->getLocation(), diag::note_previous_definition); 1012 } 1013 1014 // Keep a chain of previous declarations. 1015 New->setPreviousDeclaration(Old); 1016} 1017 1018Sema::ControlFlowKind Sema::CheckFallThrough(Stmt *Root) { 1019 llvm::OwningPtr<CFG> cfg (CFG::buildCFG(Root, &Context)); 1020 1021 // FIXME: They should never return 0, fix that, delete this code. 1022 if (cfg == 0) 1023 return NeverFallThrough; 1024 // The CFG leaves in dead things, run a simple mark and sweep on it 1025 // to weed out the trivially dead things. 1026 std::queue<CFGBlock*> workq; 1027 llvm::BitVector live(cfg->getNumBlockIDs()); 1028 // Prep work queue 1029 workq.push(&cfg->getEntry()); 1030 // Solve 1031 while (!workq.empty()) { 1032 CFGBlock *item = workq.front(); 1033 workq.pop(); 1034 live.set(item->getBlockID()); 1035 CFGBlock::succ_iterator i; 1036 for (i=item->succ_begin(); i != item->succ_end(); ++i) { 1037 if ((*i) && ! live[(*i)->getBlockID()]) { 1038 live.set((*i)->getBlockID()); 1039 workq.push(*i); 1040 } 1041 } 1042 } 1043 1044 CFGBlock::succ_iterator i; 1045 bool HasLiveReturn = false; 1046 bool HasFakeEdge = false; 1047 bool HasPlainEdge = false; 1048 for (i=cfg->getExit().pred_begin(); i != cfg->getExit().pred_end(); ++i) { 1049 if (!live[(*i)->getBlockID()]) 1050 continue; 1051 if ((*i)->size() == 0) { 1052 // A labeled empty statement, or the entry block... 1053 HasPlainEdge = true; 1054 continue; 1055 } 1056 Stmt *S = (**i)[(*i)->size()-1]; 1057 if (isa<ReturnStmt>(S)) { 1058 HasLiveReturn = true; 1059 continue; 1060 } 1061 if (isa<ObjCAtThrowStmt>(S)) { 1062 HasFakeEdge = true; 1063 continue; 1064 } 1065 if (isa<CXXThrowExpr>(S)) { 1066 HasFakeEdge = true; 1067 continue; 1068 } 1069 bool NoReturnEdge = false; 1070 if (CallExpr *C = dyn_cast<CallExpr>(S)) 1071 { 1072 Expr *CEE = C->getCallee()->IgnoreParenCasts(); 1073 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) { 1074 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(DRE->getDecl())) { 1075 if (FD->hasAttr<NoReturnAttr>()) { 1076 NoReturnEdge = true; 1077 HasFakeEdge = true; 1078 } 1079 } 1080 } 1081 } 1082 if (NoReturnEdge == false) 1083 HasPlainEdge = true; 1084 } 1085 if (HasPlainEdge) { 1086 if (HasFakeEdge|HasLiveReturn) 1087 return MaybeFallThrough; 1088 // This says never for calls to functions that are not marked noreturn, that 1089 // don't return. For people that don't like this, we encourage marking the 1090 // functions as noreturn. 1091 return AlwaysFallThrough; 1092 } 1093 return NeverFallThrough; 1094} 1095 1096/// CheckFallThroughForFunctionDef - Check that we don't fall off the end of a 1097/// function that should return a value. 1098/// 1099/// \returns Never iff we can never alter control flow (we always fall off the 1100/// end of the statement, Conditional iff we might or might not alter 1101/// control-flow and Always iff we always alter control flow (we never fall off 1102/// the end of the statement). 1103void Sema::CheckFallThroughForFunctionDef(Decl *D, Stmt *Body) { 1104 // FIXME: Would be nice if we had a better way to control cascding errors, but 1105 // for now, avoid them. 1106 if (getDiagnostics().hasErrorOccurred()) 1107 return; 1108 if (Diags.getDiagnosticLevel(diag::warn_maybe_falloff_nonvoid_function) 1109 == Diagnostic::Ignored) 1110 return; 1111 // FIXME: Funtion try block 1112 if (CompoundStmt *Compound = dyn_cast<CompoundStmt>(Body)) { 1113 switch (CheckFallThrough(Body)) { 1114 case MaybeFallThrough: 1115 Diag(Compound->getRBracLoc(), diag::warn_maybe_falloff_nonvoid_function); 1116 break; 1117 case AlwaysFallThrough: 1118 Diag(Compound->getRBracLoc(), diag::warn_falloff_nonvoid_function); 1119 break; 1120 case NeverFallThrough: 1121 break; 1122 } 1123 } 1124} 1125 1126/// CheckParmsForFunctionDef - Check that the parameters of the given 1127/// function are appropriate for the definition of a function. This 1128/// takes care of any checks that cannot be performed on the 1129/// declaration itself, e.g., that the types of each of the function 1130/// parameters are complete. 1131bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 1132 bool HasInvalidParm = false; 1133 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 1134 ParmVarDecl *Param = FD->getParamDecl(p); 1135 1136 // C99 6.7.5.3p4: the parameters in a parameter type list in a 1137 // function declarator that is part of a function definition of 1138 // that function shall not have incomplete type. 1139 // 1140 // This is also C++ [dcl.fct]p6. 1141 if (!Param->isInvalidDecl() && 1142 RequireCompleteType(Param->getLocation(), Param->getType(), 1143 diag::err_typecheck_decl_incomplete_type)) { 1144 Param->setInvalidDecl(); 1145 HasInvalidParm = true; 1146 } 1147 1148 // C99 6.9.1p5: If the declarator includes a parameter type list, the 1149 // declaration of each parameter shall include an identifier. 1150 if (Param->getIdentifier() == 0 && 1151 !Param->isImplicit() && 1152 !getLangOptions().CPlusPlus) 1153 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 1154 } 1155 1156 return HasInvalidParm; 1157} 1158 1159/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1160/// no declarator (e.g. "struct foo;") is parsed. 1161Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1162 // FIXME: Error on auto/register at file scope 1163 // FIXME: Error on inline/virtual/explicit 1164 // FIXME: Error on invalid restrict 1165 // FIXME: Warn on useless __thread 1166 // FIXME: Warn on useless const/volatile 1167 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1168 // FIXME: Warn on useless attributes 1169 TagDecl *Tag = 0; 1170 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1171 DS.getTypeSpecType() == DeclSpec::TST_struct || 1172 DS.getTypeSpecType() == DeclSpec::TST_union || 1173 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1174 if (!DS.getTypeRep()) // We probably had an error 1175 return DeclPtrTy(); 1176 1177 Tag = dyn_cast<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 1178 } 1179 1180 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1181 if (!Record->getDeclName() && Record->isDefinition() && 1182 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1183 if (getLangOptions().CPlusPlus || 1184 Record->getDeclContext()->isRecord()) 1185 return BuildAnonymousStructOrUnion(S, DS, Record); 1186 1187 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1188 << DS.getSourceRange(); 1189 } 1190 1191 // Microsoft allows unnamed struct/union fields. Don't complain 1192 // about them. 1193 // FIXME: Should we support Microsoft's extensions in this area? 1194 if (Record->getDeclName() && getLangOptions().Microsoft) 1195 return DeclPtrTy::make(Tag); 1196 } 1197 1198 if (!DS.isMissingDeclaratorOk() && 1199 DS.getTypeSpecType() != DeclSpec::TST_error) { 1200 // Warn about typedefs of enums without names, since this is an 1201 // extension in both Microsoft an GNU. 1202 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1203 Tag && isa<EnumDecl>(Tag)) { 1204 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1205 << DS.getSourceRange(); 1206 return DeclPtrTy::make(Tag); 1207 } 1208 1209 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1210 << DS.getSourceRange(); 1211 return DeclPtrTy(); 1212 } 1213 1214 return DeclPtrTy::make(Tag); 1215} 1216 1217/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1218/// anonymous struct or union AnonRecord into the owning context Owner 1219/// and scope S. This routine will be invoked just after we realize 1220/// that an unnamed union or struct is actually an anonymous union or 1221/// struct, e.g., 1222/// 1223/// @code 1224/// union { 1225/// int i; 1226/// float f; 1227/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1228/// // f into the surrounding scope.x 1229/// @endcode 1230/// 1231/// This routine is recursive, injecting the names of nested anonymous 1232/// structs/unions into the owning context and scope as well. 1233bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1234 RecordDecl *AnonRecord) { 1235 bool Invalid = false; 1236 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1237 FEnd = AnonRecord->field_end(); 1238 F != FEnd; ++F) { 1239 if ((*F)->getDeclName()) { 1240 NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 1241 LookupOrdinaryName, true); 1242 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 1243 // C++ [class.union]p2: 1244 // The names of the members of an anonymous union shall be 1245 // distinct from the names of any other entity in the 1246 // scope in which the anonymous union is declared. 1247 unsigned diagKind 1248 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 1249 : diag::err_anonymous_struct_member_redecl; 1250 Diag((*F)->getLocation(), diagKind) 1251 << (*F)->getDeclName(); 1252 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1253 Invalid = true; 1254 } else { 1255 // C++ [class.union]p2: 1256 // For the purpose of name lookup, after the anonymous union 1257 // definition, the members of the anonymous union are 1258 // considered to have been defined in the scope in which the 1259 // anonymous union is declared. 1260 Owner->makeDeclVisibleInContext(*F); 1261 S->AddDecl(DeclPtrTy::make(*F)); 1262 IdResolver.AddDecl(*F); 1263 } 1264 } else if (const RecordType *InnerRecordType 1265 = (*F)->getType()->getAsRecordType()) { 1266 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1267 if (InnerRecord->isAnonymousStructOrUnion()) 1268 Invalid = Invalid || 1269 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1270 } 1271 } 1272 1273 return Invalid; 1274} 1275 1276/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1277/// anonymous structure or union. Anonymous unions are a C++ feature 1278/// (C++ [class.union]) and a GNU C extension; anonymous structures 1279/// are a GNU C and GNU C++ extension. 1280Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1281 RecordDecl *Record) { 1282 DeclContext *Owner = Record->getDeclContext(); 1283 1284 // Diagnose whether this anonymous struct/union is an extension. 1285 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1286 Diag(Record->getLocation(), diag::ext_anonymous_union); 1287 else if (!Record->isUnion()) 1288 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1289 1290 // C and C++ require different kinds of checks for anonymous 1291 // structs/unions. 1292 bool Invalid = false; 1293 if (getLangOptions().CPlusPlus) { 1294 const char* PrevSpec = 0; 1295 // C++ [class.union]p3: 1296 // Anonymous unions declared in a named namespace or in the 1297 // global namespace shall be declared static. 1298 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1299 (isa<TranslationUnitDecl>(Owner) || 1300 (isa<NamespaceDecl>(Owner) && 1301 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1302 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1303 Invalid = true; 1304 1305 // Recover by adding 'static'. 1306 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); 1307 } 1308 // C++ [class.union]p3: 1309 // A storage class is not allowed in a declaration of an 1310 // anonymous union in a class scope. 1311 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1312 isa<RecordDecl>(Owner)) { 1313 Diag(DS.getStorageClassSpecLoc(), 1314 diag::err_anonymous_union_with_storage_spec); 1315 Invalid = true; 1316 1317 // Recover by removing the storage specifier. 1318 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1319 PrevSpec); 1320 } 1321 1322 // C++ [class.union]p2: 1323 // The member-specification of an anonymous union shall only 1324 // define non-static data members. [Note: nested types and 1325 // functions cannot be declared within an anonymous union. ] 1326 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1327 MemEnd = Record->decls_end(); 1328 Mem != MemEnd; ++Mem) { 1329 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1330 // C++ [class.union]p3: 1331 // An anonymous union shall not have private or protected 1332 // members (clause 11). 1333 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1334 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1335 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1336 Invalid = true; 1337 } 1338 } else if ((*Mem)->isImplicit()) { 1339 // Any implicit members are fine. 1340 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1341 // This is a type that showed up in an 1342 // elaborated-type-specifier inside the anonymous struct or 1343 // union, but which actually declares a type outside of the 1344 // anonymous struct or union. It's okay. 1345 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1346 if (!MemRecord->isAnonymousStructOrUnion() && 1347 MemRecord->getDeclName()) { 1348 // This is a nested type declaration. 1349 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1350 << (int)Record->isUnion(); 1351 Invalid = true; 1352 } 1353 } else { 1354 // We have something that isn't a non-static data 1355 // member. Complain about it. 1356 unsigned DK = diag::err_anonymous_record_bad_member; 1357 if (isa<TypeDecl>(*Mem)) 1358 DK = diag::err_anonymous_record_with_type; 1359 else if (isa<FunctionDecl>(*Mem)) 1360 DK = diag::err_anonymous_record_with_function; 1361 else if (isa<VarDecl>(*Mem)) 1362 DK = diag::err_anonymous_record_with_static; 1363 Diag((*Mem)->getLocation(), DK) 1364 << (int)Record->isUnion(); 1365 Invalid = true; 1366 } 1367 } 1368 } 1369 1370 if (!Record->isUnion() && !Owner->isRecord()) { 1371 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1372 << (int)getLangOptions().CPlusPlus; 1373 Invalid = true; 1374 } 1375 1376 // Create a declaration for this anonymous struct/union. 1377 NamedDecl *Anon = 0; 1378 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1379 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1380 /*IdentifierInfo=*/0, 1381 Context.getTypeDeclType(Record), 1382 /*BitWidth=*/0, /*Mutable=*/false, 1383 DS.getSourceRange().getBegin()); 1384 Anon->setAccess(AS_public); 1385 if (getLangOptions().CPlusPlus) 1386 FieldCollector->Add(cast<FieldDecl>(Anon)); 1387 } else { 1388 VarDecl::StorageClass SC; 1389 switch (DS.getStorageClassSpec()) { 1390 default: assert(0 && "Unknown storage class!"); 1391 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1392 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1393 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1394 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1395 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1396 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1397 case DeclSpec::SCS_mutable: 1398 // mutable can only appear on non-static class members, so it's always 1399 // an error here 1400 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1401 Invalid = true; 1402 SC = VarDecl::None; 1403 break; 1404 } 1405 1406 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1407 /*IdentifierInfo=*/0, 1408 Context.getTypeDeclType(Record), 1409 SC, DS.getSourceRange().getBegin()); 1410 } 1411 Anon->setImplicit(); 1412 1413 // Add the anonymous struct/union object to the current 1414 // context. We'll be referencing this object when we refer to one of 1415 // its members. 1416 Owner->addDecl(Anon); 1417 1418 // Inject the members of the anonymous struct/union into the owning 1419 // context and into the identifier resolver chain for name lookup 1420 // purposes. 1421 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1422 Invalid = true; 1423 1424 // Mark this as an anonymous struct/union type. Note that we do not 1425 // do this until after we have already checked and injected the 1426 // members of this anonymous struct/union type, because otherwise 1427 // the members could be injected twice: once by DeclContext when it 1428 // builds its lookup table, and once by 1429 // InjectAnonymousStructOrUnionMembers. 1430 Record->setAnonymousStructOrUnion(true); 1431 1432 if (Invalid) 1433 Anon->setInvalidDecl(); 1434 1435 return DeclPtrTy::make(Anon); 1436} 1437 1438 1439/// GetNameForDeclarator - Determine the full declaration name for the 1440/// given Declarator. 1441DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1442 switch (D.getKind()) { 1443 case Declarator::DK_Abstract: 1444 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 1445 return DeclarationName(); 1446 1447 case Declarator::DK_Normal: 1448 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 1449 return DeclarationName(D.getIdentifier()); 1450 1451 case Declarator::DK_Constructor: { 1452 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1453 Ty = Context.getCanonicalType(Ty); 1454 return Context.DeclarationNames.getCXXConstructorName(Ty); 1455 } 1456 1457 case Declarator::DK_Destructor: { 1458 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1459 Ty = Context.getCanonicalType(Ty); 1460 return Context.DeclarationNames.getCXXDestructorName(Ty); 1461 } 1462 1463 case Declarator::DK_Conversion: { 1464 // FIXME: We'd like to keep the non-canonical type for diagnostics! 1465 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1466 Ty = Context.getCanonicalType(Ty); 1467 return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 1468 } 1469 1470 case Declarator::DK_Operator: 1471 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 1472 return Context.DeclarationNames.getCXXOperatorName( 1473 D.getOverloadedOperator()); 1474 } 1475 1476 assert(false && "Unknown name kind"); 1477 return DeclarationName(); 1478} 1479 1480/// isNearlyMatchingFunction - Determine whether the C++ functions 1481/// Declaration and Definition are "nearly" matching. This heuristic 1482/// is used to improve diagnostics in the case where an out-of-line 1483/// function definition doesn't match any declaration within 1484/// the class or namespace. 1485static bool isNearlyMatchingFunction(ASTContext &Context, 1486 FunctionDecl *Declaration, 1487 FunctionDecl *Definition) { 1488 if (Declaration->param_size() != Definition->param_size()) 1489 return false; 1490 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1491 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1492 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1493 1494 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1495 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 1496 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1497 return false; 1498 } 1499 1500 return true; 1501} 1502 1503Sema::DeclPtrTy 1504Sema::HandleDeclarator(Scope *S, Declarator &D, 1505 MultiTemplateParamsArg TemplateParamLists, 1506 bool IsFunctionDefinition) { 1507 DeclarationName Name = GetNameForDeclarator(D); 1508 1509 // All of these full declarators require an identifier. If it doesn't have 1510 // one, the ParsedFreeStandingDeclSpec action should be used. 1511 if (!Name) { 1512 if (!D.isInvalidType()) // Reject this if we think it is valid. 1513 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1514 diag::err_declarator_need_ident) 1515 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1516 return DeclPtrTy(); 1517 } 1518 1519 // The scope passed in may not be a decl scope. Zip up the scope tree until 1520 // we find one that is. 1521 while ((S->getFlags() & Scope::DeclScope) == 0 || 1522 (S->getFlags() & Scope::TemplateParamScope) != 0) 1523 S = S->getParent(); 1524 1525 DeclContext *DC; 1526 NamedDecl *PrevDecl; 1527 NamedDecl *New; 1528 1529 QualType R = GetTypeForDeclarator(D, S); 1530 1531 // See if this is a redefinition of a variable in the same scope. 1532 if (D.getCXXScopeSpec().isInvalid()) { 1533 DC = CurContext; 1534 PrevDecl = 0; 1535 D.setInvalidType(); 1536 } else if (!D.getCXXScopeSpec().isSet()) { 1537 LookupNameKind NameKind = LookupOrdinaryName; 1538 1539 // If the declaration we're planning to build will be a function 1540 // or object with linkage, then look for another declaration with 1541 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1542 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1543 /* Do nothing*/; 1544 else if (R->isFunctionType()) { 1545 if (CurContext->isFunctionOrMethod() || 1546 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1547 NameKind = LookupRedeclarationWithLinkage; 1548 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1549 NameKind = LookupRedeclarationWithLinkage; 1550 else if (CurContext->getLookupContext()->isTranslationUnit() && 1551 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1552 NameKind = LookupRedeclarationWithLinkage; 1553 1554 DC = CurContext; 1555 PrevDecl = LookupName(S, Name, NameKind, true, 1556 NameKind == LookupRedeclarationWithLinkage, 1557 D.getIdentifierLoc()); 1558 } else { // Something like "int foo::x;" 1559 DC = computeDeclContext(D.getCXXScopeSpec(), true); 1560 // FIXME: RequireCompleteDeclContext(D.getCXXScopeSpec()); ? 1561 PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName, true); 1562 1563 // C++ 7.3.1.2p2: 1564 // Members (including explicit specializations of templates) of a named 1565 // namespace can also be defined outside that namespace by explicit 1566 // qualification of the name being defined, provided that the entity being 1567 // defined was already declared in the namespace and the definition appears 1568 // after the point of declaration in a namespace that encloses the 1569 // declarations namespace. 1570 // 1571 // Note that we only check the context at this point. We don't yet 1572 // have enough information to make sure that PrevDecl is actually 1573 // the declaration we want to match. For example, given: 1574 // 1575 // class X { 1576 // void f(); 1577 // void f(float); 1578 // }; 1579 // 1580 // void X::f(int) { } // ill-formed 1581 // 1582 // In this case, PrevDecl will point to the overload set 1583 // containing the two f's declared in X, but neither of them 1584 // matches. 1585 1586 // First check whether we named the global scope. 1587 if (isa<TranslationUnitDecl>(DC)) { 1588 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1589 << Name << D.getCXXScopeSpec().getRange(); 1590 } else if (!CurContext->Encloses(DC)) { 1591 // The qualifying scope doesn't enclose the original declaration. 1592 // Emit diagnostic based on current scope. 1593 SourceLocation L = D.getIdentifierLoc(); 1594 SourceRange R = D.getCXXScopeSpec().getRange(); 1595 if (isa<FunctionDecl>(CurContext)) 1596 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1597 else 1598 Diag(L, diag::err_invalid_declarator_scope) 1599 << Name << cast<NamedDecl>(DC) << R; 1600 D.setInvalidType(); 1601 } 1602 } 1603 1604 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1605 // Maybe we will complain about the shadowed template parameter. 1606 if (!D.isInvalidType()) 1607 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl)) 1608 D.setInvalidType(); 1609 1610 // Just pretend that we didn't see the previous declaration. 1611 PrevDecl = 0; 1612 } 1613 1614 // In C++, the previous declaration we find might be a tag type 1615 // (class or enum). In this case, the new declaration will hide the 1616 // tag type. Note that this does does not apply if we're declaring a 1617 // typedef (C++ [dcl.typedef]p4). 1618 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 1619 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1620 PrevDecl = 0; 1621 1622 bool Redeclaration = false; 1623 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1624 if (TemplateParamLists.size()) { 1625 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 1626 return DeclPtrTy(); 1627 } 1628 1629 New = ActOnTypedefDeclarator(S, D, DC, R, PrevDecl, Redeclaration); 1630 } else if (R->isFunctionType()) { 1631 New = ActOnFunctionDeclarator(S, D, DC, R, PrevDecl, 1632 move(TemplateParamLists), 1633 IsFunctionDefinition, Redeclaration); 1634 } else { 1635 New = ActOnVariableDeclarator(S, D, DC, R, PrevDecl, 1636 move(TemplateParamLists), 1637 Redeclaration); 1638 } 1639 1640 if (New == 0) 1641 return DeclPtrTy(); 1642 1643 // If this has an identifier and is not an invalid redeclaration, 1644 // add it to the scope stack. 1645 if (Name && !(Redeclaration && New->isInvalidDecl())) 1646 PushOnScopeChains(New, S); 1647 1648 return DeclPtrTy::make(New); 1649} 1650 1651/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 1652/// types into constant array types in certain situations which would otherwise 1653/// be errors (for GCC compatibility). 1654static QualType TryToFixInvalidVariablyModifiedType(QualType T, 1655 ASTContext &Context, 1656 bool &SizeIsNegative) { 1657 // This method tries to turn a variable array into a constant 1658 // array even when the size isn't an ICE. This is necessary 1659 // for compatibility with code that depends on gcc's buggy 1660 // constant expression folding, like struct {char x[(int)(char*)2];} 1661 SizeIsNegative = false; 1662 1663 if (const PointerType* PTy = dyn_cast<PointerType>(T)) { 1664 QualType Pointee = PTy->getPointeeType(); 1665 QualType FixedType = 1666 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 1667 if (FixedType.isNull()) return FixedType; 1668 FixedType = Context.getPointerType(FixedType); 1669 FixedType.setCVRQualifiers(T.getCVRQualifiers()); 1670 return FixedType; 1671 } 1672 1673 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 1674 if (!VLATy) 1675 return QualType(); 1676 // FIXME: We should probably handle this case 1677 if (VLATy->getElementType()->isVariablyModifiedType()) 1678 return QualType(); 1679 1680 Expr::EvalResult EvalResult; 1681 if (!VLATy->getSizeExpr() || 1682 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 1683 !EvalResult.Val.isInt()) 1684 return QualType(); 1685 1686 llvm::APSInt &Res = EvalResult.Val.getInt(); 1687 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 1688 Expr* ArySizeExpr = VLATy->getSizeExpr(); 1689 // FIXME: here we could "steal" (how?) ArySizeExpr from the VLA, 1690 // so as to transfer ownership to the ConstantArrayWithExpr. 1691 // Alternatively, we could "clone" it (how?). 1692 // Since we don't know how to do things above, we just use the 1693 // very same Expr*. 1694 return Context.getConstantArrayWithExprType(VLATy->getElementType(), 1695 Res, ArySizeExpr, 1696 ArrayType::Normal, 0, 1697 VLATy->getBracketsRange()); 1698 } 1699 1700 SizeIsNegative = true; 1701 return QualType(); 1702} 1703 1704/// \brief Register the given locally-scoped external C declaration so 1705/// that it can be found later for redeclarations 1706void 1707Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, NamedDecl *PrevDecl, 1708 Scope *S) { 1709 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 1710 "Decl is not a locally-scoped decl!"); 1711 // Note that we have a locally-scoped external with this name. 1712 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 1713 1714 if (!PrevDecl) 1715 return; 1716 1717 // If there was a previous declaration of this variable, it may be 1718 // in our identifier chain. Update the identifier chain with the new 1719 // declaration. 1720 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 1721 // The previous declaration was found on the identifer resolver 1722 // chain, so remove it from its scope. 1723 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 1724 S = S->getParent(); 1725 1726 if (S) 1727 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 1728 } 1729} 1730 1731/// \brief Diagnose function specifiers on a declaration of an identifier that 1732/// does not identify a function. 1733void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 1734 // FIXME: We should probably indicate the identifier in question to avoid 1735 // confusion for constructs like "inline int a(), b;" 1736 if (D.getDeclSpec().isInlineSpecified()) 1737 Diag(D.getDeclSpec().getInlineSpecLoc(), 1738 diag::err_inline_non_function); 1739 1740 if (D.getDeclSpec().isVirtualSpecified()) 1741 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1742 diag::err_virtual_non_function); 1743 1744 if (D.getDeclSpec().isExplicitSpecified()) 1745 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1746 diag::err_explicit_non_function); 1747} 1748 1749NamedDecl* 1750Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1751 QualType R, Decl* PrevDecl, bool &Redeclaration) { 1752 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1753 if (D.getCXXScopeSpec().isSet()) { 1754 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1755 << D.getCXXScopeSpec().getRange(); 1756 D.setInvalidType(); 1757 // Pretend we didn't see the scope specifier. 1758 DC = 0; 1759 } 1760 1761 if (getLangOptions().CPlusPlus) { 1762 // Check that there are no default arguments (C++ only). 1763 CheckExtraCXXDefaultArguments(D); 1764 } 1765 1766 DiagnoseFunctionSpecifiers(D); 1767 1768 if (D.getDeclSpec().isThreadSpecified()) 1769 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 1770 1771 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R); 1772 if (!NewTD) return 0; 1773 1774 if (D.isInvalidType()) 1775 NewTD->setInvalidDecl(); 1776 1777 // Handle attributes prior to checking for duplicates in MergeVarDecl 1778 ProcessDeclAttributes(S, NewTD, D); 1779 // Merge the decl with the existing one if appropriate. If the decl is 1780 // in an outer scope, it isn't the same thing. 1781 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1782 Redeclaration = true; 1783 MergeTypeDefDecl(NewTD, PrevDecl); 1784 } 1785 1786 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1787 // then it shall have block scope. 1788 QualType T = NewTD->getUnderlyingType(); 1789 if (T->isVariablyModifiedType()) { 1790 CurFunctionNeedsScopeChecking = true; 1791 1792 if (S->getFnParent() == 0) { 1793 bool SizeIsNegative; 1794 QualType FixedTy = 1795 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1796 if (!FixedTy.isNull()) { 1797 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 1798 NewTD->setUnderlyingType(FixedTy); 1799 } else { 1800 if (SizeIsNegative) 1801 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 1802 else if (T->isVariableArrayType()) 1803 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1804 else 1805 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1806 NewTD->setInvalidDecl(); 1807 } 1808 } 1809 } 1810 1811 // If this is the C FILE type, notify the AST context. 1812 if (IdentifierInfo *II = NewTD->getIdentifier()) 1813 if (!NewTD->isInvalidDecl() && 1814 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit() && 1815 II->isStr("FILE")) 1816 Context.setFILEDecl(NewTD); 1817 1818 return NewTD; 1819} 1820 1821/// \brief Determines whether the given declaration is an out-of-scope 1822/// previous declaration. 1823/// 1824/// This routine should be invoked when name lookup has found a 1825/// previous declaration (PrevDecl) that is not in the scope where a 1826/// new declaration by the same name is being introduced. If the new 1827/// declaration occurs in a local scope, previous declarations with 1828/// linkage may still be considered previous declarations (C99 1829/// 6.2.2p4-5, C++ [basic.link]p6). 1830/// 1831/// \param PrevDecl the previous declaration found by name 1832/// lookup 1833/// 1834/// \param DC the context in which the new declaration is being 1835/// declared. 1836/// 1837/// \returns true if PrevDecl is an out-of-scope previous declaration 1838/// for a new delcaration with the same name. 1839static bool 1840isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 1841 ASTContext &Context) { 1842 if (!PrevDecl) 1843 return 0; 1844 1845 // FIXME: PrevDecl could be an OverloadedFunctionDecl, in which 1846 // case we need to check each of the overloaded functions. 1847 if (!PrevDecl->hasLinkage()) 1848 return false; 1849 1850 if (Context.getLangOptions().CPlusPlus) { 1851 // C++ [basic.link]p6: 1852 // If there is a visible declaration of an entity with linkage 1853 // having the same name and type, ignoring entities declared 1854 // outside the innermost enclosing namespace scope, the block 1855 // scope declaration declares that same entity and receives the 1856 // linkage of the previous declaration. 1857 DeclContext *OuterContext = DC->getLookupContext(); 1858 if (!OuterContext->isFunctionOrMethod()) 1859 // This rule only applies to block-scope declarations. 1860 return false; 1861 else { 1862 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 1863 if (PrevOuterContext->isRecord()) 1864 // We found a member function: ignore it. 1865 return false; 1866 else { 1867 // Find the innermost enclosing namespace for the new and 1868 // previous declarations. 1869 while (!OuterContext->isFileContext()) 1870 OuterContext = OuterContext->getParent(); 1871 while (!PrevOuterContext->isFileContext()) 1872 PrevOuterContext = PrevOuterContext->getParent(); 1873 1874 // The previous declaration is in a different namespace, so it 1875 // isn't the same function. 1876 if (OuterContext->getPrimaryContext() != 1877 PrevOuterContext->getPrimaryContext()) 1878 return false; 1879 } 1880 } 1881 } 1882 1883 return true; 1884} 1885 1886NamedDecl* 1887Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1888 QualType R,NamedDecl* PrevDecl, 1889 MultiTemplateParamsArg TemplateParamLists, 1890 bool &Redeclaration) { 1891 DeclarationName Name = GetNameForDeclarator(D); 1892 1893 // Check that there are no default arguments (C++ only). 1894 if (getLangOptions().CPlusPlus) 1895 CheckExtraCXXDefaultArguments(D); 1896 1897 VarDecl *NewVD; 1898 VarDecl::StorageClass SC; 1899 switch (D.getDeclSpec().getStorageClassSpec()) { 1900 default: assert(0 && "Unknown storage class!"); 1901 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1902 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1903 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1904 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1905 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1906 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1907 case DeclSpec::SCS_mutable: 1908 // mutable can only appear on non-static class members, so it's always 1909 // an error here 1910 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1911 D.setInvalidType(); 1912 SC = VarDecl::None; 1913 break; 1914 } 1915 1916 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1917 if (!II) { 1918 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1919 << Name.getAsString(); 1920 return 0; 1921 } 1922 1923 DiagnoseFunctionSpecifiers(D); 1924 1925 if (!DC->isRecord() && S->getFnParent() == 0) { 1926 // C99 6.9p2: The storage-class specifiers auto and register shall not 1927 // appear in the declaration specifiers in an external declaration. 1928 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 1929 1930 // If this is a register variable with an asm label specified, then this 1931 // is a GNU extension. 1932 if (SC == VarDecl::Register && D.getAsmLabel()) 1933 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 1934 else 1935 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 1936 D.setInvalidType(); 1937 } 1938 } 1939 if (DC->isRecord() && !CurContext->isRecord()) { 1940 // This is an out-of-line definition of a static data member. 1941 if (SC == VarDecl::Static) { 1942 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1943 diag::err_static_out_of_line) 1944 << CodeModificationHint::CreateRemoval( 1945 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 1946 } else if (SC == VarDecl::None) 1947 SC = VarDecl::Static; 1948 } 1949 if (SC == VarDecl::Static) { 1950 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 1951 if (RD->isLocalClass()) 1952 Diag(D.getIdentifierLoc(), 1953 diag::err_static_data_member_not_allowed_in_local_class) 1954 << Name << RD->getDeclName(); 1955 } 1956 } 1957 1958 // Check that we can declare a template here. 1959 if (TemplateParamLists.size() && 1960 CheckTemplateDeclScope(S, TemplateParamLists)) 1961 return 0; 1962 1963 // Match up the template parameter lists with the scope specifier, then 1964 // determine whether we have a template or a template specialization. 1965 if (TemplateParameterList *TemplateParams 1966 = MatchTemplateParametersToScopeSpecifier( 1967 D.getDeclSpec().getSourceRange().getBegin(), 1968 D.getCXXScopeSpec(), 1969 (TemplateParameterList**)TemplateParamLists.get(), 1970 TemplateParamLists.size())) { 1971 if (TemplateParams->size() > 0) { 1972 // There is no such thing as a variable template. 1973 Diag(D.getIdentifierLoc(), diag::err_template_variable) 1974 << II 1975 << SourceRange(TemplateParams->getTemplateLoc(), 1976 TemplateParams->getRAngleLoc()); 1977 return 0; 1978 } else { 1979 // There is an extraneous 'template<>' for this variable. Complain 1980 // about it, but allow the declaration of the variable. 1981 Diag(TemplateParams->getTemplateLoc(), 1982 diag::err_template_variable_noparams) 1983 << II 1984 << SourceRange(TemplateParams->getTemplateLoc(), 1985 TemplateParams->getRAngleLoc()); 1986 } 1987 } 1988 1989 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1990 II, R, SC, 1991 // FIXME: Move to DeclGroup... 1992 D.getDeclSpec().getSourceRange().getBegin()); 1993 1994 if (D.isInvalidType()) 1995 NewVD->setInvalidDecl(); 1996 1997 if (D.getDeclSpec().isThreadSpecified()) { 1998 if (NewVD->hasLocalStorage()) 1999 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2000 else if (!Context.Target.isTLSSupported()) 2001 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2002 else 2003 NewVD->setThreadSpecified(true); 2004 } 2005 2006 // Set the lexical context. If the declarator has a C++ scope specifier, the 2007 // lexical context will be different from the semantic context. 2008 NewVD->setLexicalDeclContext(CurContext); 2009 2010 // Handle attributes prior to checking for duplicates in MergeVarDecl 2011 ProcessDeclAttributes(S, NewVD, D); 2012 2013 // Handle GNU asm-label extension (encoded as an attribute). 2014 if (Expr *E = (Expr*) D.getAsmLabel()) { 2015 // The parser guarantees this is a string. 2016 StringLiteral *SE = cast<StringLiteral>(E); 2017 NewVD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 2018 SE->getByteLength()))); 2019 } 2020 2021 // If name lookup finds a previous declaration that is not in the 2022 // same scope as the new declaration, this may still be an 2023 // acceptable redeclaration. 2024 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 2025 !(NewVD->hasLinkage() && 2026 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 2027 PrevDecl = 0; 2028 2029 // Merge the decl with the existing one if appropriate. 2030 if (PrevDecl) { 2031 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 2032 // The user tried to define a non-static data member 2033 // out-of-line (C++ [dcl.meaning]p1). 2034 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2035 << D.getCXXScopeSpec().getRange(); 2036 PrevDecl = 0; 2037 NewVD->setInvalidDecl(); 2038 } 2039 } else if (D.getCXXScopeSpec().isSet()) { 2040 // No previous declaration in the qualifying scope. 2041 Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 2042 << Name << D.getCXXScopeSpec().getRange(); 2043 NewVD->setInvalidDecl(); 2044 } 2045 2046 CheckVariableDeclaration(NewVD, PrevDecl, Redeclaration); 2047 2048 // If this is a locally-scoped extern C variable, update the map of 2049 // such variables. 2050 if (CurContext->isFunctionOrMethod() && NewVD->isExternC(Context) && 2051 !NewVD->isInvalidDecl()) 2052 RegisterLocallyScopedExternCDecl(NewVD, PrevDecl, S); 2053 2054 return NewVD; 2055} 2056 2057/// \brief Perform semantic checking on a newly-created variable 2058/// declaration. 2059/// 2060/// This routine performs all of the type-checking required for a 2061/// variable declaration once it has been built. It is used both to 2062/// check variables after they have been parsed and their declarators 2063/// have been translated into a declaration, and to check variables 2064/// that have been instantiated from a template. 2065/// 2066/// Sets NewVD->isInvalidDecl() if an error was encountered. 2067void Sema::CheckVariableDeclaration(VarDecl *NewVD, NamedDecl *PrevDecl, 2068 bool &Redeclaration) { 2069 // If the decl is already known invalid, don't check it. 2070 if (NewVD->isInvalidDecl()) 2071 return; 2072 2073 QualType T = NewVD->getType(); 2074 2075 if (T->isObjCInterfaceType()) { 2076 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2077 return NewVD->setInvalidDecl(); 2078 } 2079 2080 // The variable can not have an abstract class type. 2081 if (RequireNonAbstractType(NewVD->getLocation(), T, 2082 diag::err_abstract_type_in_decl, 2083 AbstractVariableType)) 2084 return NewVD->setInvalidDecl(); 2085 2086 // Emit an error if an address space was applied to decl with local storage. 2087 // This includes arrays of objects with address space qualifiers, but not 2088 // automatic variables that point to other address spaces. 2089 // ISO/IEC TR 18037 S5.1.2 2090 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2091 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2092 return NewVD->setInvalidDecl(); 2093 } 2094 2095 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2096 && !NewVD->hasAttr<BlocksAttr>()) 2097 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2098 2099 bool isVM = T->isVariablyModifiedType(); 2100 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2101 NewVD->hasAttr<BlocksAttr>()) 2102 CurFunctionNeedsScopeChecking = true; 2103 2104 if ((isVM && NewVD->hasLinkage()) || 2105 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2106 bool SizeIsNegative; 2107 QualType FixedTy = 2108 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2109 2110 if (FixedTy.isNull() && T->isVariableArrayType()) { 2111 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2112 // FIXME: This won't give the correct result for 2113 // int a[10][n]; 2114 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2115 2116 if (NewVD->isFileVarDecl()) 2117 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2118 << SizeRange; 2119 else if (NewVD->getStorageClass() == VarDecl::Static) 2120 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2121 << SizeRange; 2122 else 2123 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2124 << SizeRange; 2125 return NewVD->setInvalidDecl(); 2126 } 2127 2128 if (FixedTy.isNull()) { 2129 if (NewVD->isFileVarDecl()) 2130 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2131 else 2132 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2133 return NewVD->setInvalidDecl(); 2134 } 2135 2136 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2137 NewVD->setType(FixedTy); 2138 } 2139 2140 if (!PrevDecl && NewVD->isExternC(Context)) { 2141 // Since we did not find anything by this name and we're declaring 2142 // an extern "C" variable, look for a non-visible extern "C" 2143 // declaration with the same name. 2144 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2145 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2146 if (Pos != LocallyScopedExternalDecls.end()) 2147 PrevDecl = Pos->second; 2148 } 2149 2150 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2151 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2152 << T; 2153 return NewVD->setInvalidDecl(); 2154 } 2155 2156 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2157 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2158 return NewVD->setInvalidDecl(); 2159 } 2160 2161 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2162 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2163 return NewVD->setInvalidDecl(); 2164 } 2165 2166 if (PrevDecl) { 2167 Redeclaration = true; 2168 MergeVarDecl(NewVD, PrevDecl); 2169 } 2170} 2171 2172NamedDecl* 2173Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2174 QualType R, NamedDecl* PrevDecl, 2175 MultiTemplateParamsArg TemplateParamLists, 2176 bool IsFunctionDefinition, bool &Redeclaration) { 2177 assert(R.getTypePtr()->isFunctionType()); 2178 2179 DeclarationName Name = GetNameForDeclarator(D); 2180 FunctionDecl::StorageClass SC = FunctionDecl::None; 2181 switch (D.getDeclSpec().getStorageClassSpec()) { 2182 default: assert(0 && "Unknown storage class!"); 2183 case DeclSpec::SCS_auto: 2184 case DeclSpec::SCS_register: 2185 case DeclSpec::SCS_mutable: 2186 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2187 diag::err_typecheck_sclass_func); 2188 D.setInvalidType(); 2189 break; 2190 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2191 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2192 case DeclSpec::SCS_static: { 2193 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2194 // C99 6.7.1p5: 2195 // The declaration of an identifier for a function that has 2196 // block scope shall have no explicit storage-class specifier 2197 // other than extern 2198 // See also (C++ [dcl.stc]p4). 2199 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2200 diag::err_static_block_func); 2201 SC = FunctionDecl::None; 2202 } else 2203 SC = FunctionDecl::Static; 2204 break; 2205 } 2206 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2207 } 2208 2209 if (D.getDeclSpec().isThreadSpecified()) 2210 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2211 2212 bool isInline = D.getDeclSpec().isInlineSpecified(); 2213 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2214 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2215 2216 // Check that the return type is not an abstract class type. 2217 // For record types, this is done by the AbstractClassUsageDiagnoser once 2218 // the class has been completely parsed. 2219 if (!DC->isRecord() && 2220 RequireNonAbstractType(D.getIdentifierLoc(), 2221 R->getAsFunctionType()->getResultType(), 2222 diag::err_abstract_type_in_decl, 2223 AbstractReturnType)) 2224 D.setInvalidType(); 2225 2226 // Do not allow returning a objc interface by-value. 2227 if (R->getAsFunctionType()->getResultType()->isObjCInterfaceType()) { 2228 Diag(D.getIdentifierLoc(), 2229 diag::err_object_cannot_be_passed_returned_by_value) << 0 2230 << R->getAsFunctionType()->getResultType(); 2231 D.setInvalidType(); 2232 } 2233 2234 // Check that we can declare a template here. 2235 if (TemplateParamLists.size() && 2236 CheckTemplateDeclScope(S, TemplateParamLists)) 2237 return 0; 2238 2239 bool isVirtualOkay = false; 2240 FunctionDecl *NewFD; 2241 if (D.getKind() == Declarator::DK_Constructor) { 2242 // This is a C++ constructor declaration. 2243 assert(DC->isRecord() && 2244 "Constructors can only be declared in a member context"); 2245 2246 R = CheckConstructorDeclarator(D, R, SC); 2247 2248 // Create the new declaration 2249 NewFD = CXXConstructorDecl::Create(Context, 2250 cast<CXXRecordDecl>(DC), 2251 D.getIdentifierLoc(), Name, R, 2252 isExplicit, isInline, 2253 /*isImplicitlyDeclared=*/false); 2254 } else if (D.getKind() == Declarator::DK_Destructor) { 2255 // This is a C++ destructor declaration. 2256 if (DC->isRecord()) { 2257 R = CheckDestructorDeclarator(D, SC); 2258 2259 NewFD = CXXDestructorDecl::Create(Context, 2260 cast<CXXRecordDecl>(DC), 2261 D.getIdentifierLoc(), Name, R, 2262 isInline, 2263 /*isImplicitlyDeclared=*/false); 2264 2265 isVirtualOkay = true; 2266 } else { 2267 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2268 2269 // Create a FunctionDecl to satisfy the function definition parsing 2270 // code path. 2271 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2272 Name, R, SC, isInline, 2273 /*hasPrototype=*/true, 2274 // FIXME: Move to DeclGroup... 2275 D.getDeclSpec().getSourceRange().getBegin()); 2276 D.setInvalidType(); 2277 } 2278 } else if (D.getKind() == Declarator::DK_Conversion) { 2279 if (!DC->isRecord()) { 2280 Diag(D.getIdentifierLoc(), 2281 diag::err_conv_function_not_member); 2282 return 0; 2283 } 2284 2285 CheckConversionDeclarator(D, R, SC); 2286 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2287 D.getIdentifierLoc(), Name, R, 2288 isInline, isExplicit); 2289 2290 isVirtualOkay = true; 2291 } else if (DC->isRecord()) { 2292 // If the of the function is the same as the name of the record, then this 2293 // must be an invalid constructor that has a return type. 2294 // (The parser checks for a return type and makes the declarator a 2295 // constructor if it has no return type). 2296 // must have an invalid constructor that has a return type 2297 if (Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2298 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2299 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2300 << SourceRange(D.getIdentifierLoc()); 2301 return 0; 2302 } 2303 2304 // This is a C++ method declaration. 2305 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2306 D.getIdentifierLoc(), Name, R, 2307 (SC == FunctionDecl::Static), isInline); 2308 2309 isVirtualOkay = (SC != FunctionDecl::Static); 2310 } else { 2311 // Determine whether the function was written with a 2312 // prototype. This true when: 2313 // - we're in C++ (where every function has a prototype), 2314 // - there is a prototype in the declarator, or 2315 // - the type R of the function is some kind of typedef or other reference 2316 // to a type name (which eventually refers to a function type). 2317 bool HasPrototype = 2318 getLangOptions().CPlusPlus || 2319 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2320 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2321 2322 NewFD = FunctionDecl::Create(Context, DC, 2323 D.getIdentifierLoc(), 2324 Name, R, SC, isInline, HasPrototype, 2325 // FIXME: Move to DeclGroup... 2326 D.getDeclSpec().getSourceRange().getBegin()); 2327 } 2328 2329 if (D.isInvalidType()) 2330 NewFD->setInvalidDecl(); 2331 2332 // Set the lexical context. If the declarator has a C++ 2333 // scope specifier, the lexical context will be different 2334 // from the semantic context. 2335 NewFD->setLexicalDeclContext(CurContext); 2336 2337 // Match up the template parameter lists with the scope specifier, then 2338 // determine whether we have a template or a template specialization. 2339 FunctionTemplateDecl *FunctionTemplate = 0; 2340 if (TemplateParameterList *TemplateParams 2341 = MatchTemplateParametersToScopeSpecifier( 2342 D.getDeclSpec().getSourceRange().getBegin(), 2343 D.getCXXScopeSpec(), 2344 (TemplateParameterList**)TemplateParamLists.get(), 2345 TemplateParamLists.size())) { 2346 if (TemplateParams->size() > 0) { 2347 // This is a function template 2348 FunctionTemplate = FunctionTemplateDecl::Create(Context, CurContext, 2349 NewFD->getLocation(), 2350 Name, TemplateParams, 2351 NewFD); 2352 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 2353 } else { 2354 // FIXME: Handle function template specializations 2355 } 2356 2357 // FIXME: Free this memory properly. 2358 TemplateParamLists.release(); 2359 } 2360 2361 // C++ [dcl.fct.spec]p5: 2362 // The virtual specifier shall only be used in declarations of 2363 // nonstatic class member functions that appear within a 2364 // member-specification of a class declaration; see 10.3. 2365 // 2366 if (isVirtual && !NewFD->isInvalidDecl()) { 2367 if (!isVirtualOkay) { 2368 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2369 diag::err_virtual_non_function); 2370 } else if (!CurContext->isRecord()) { 2371 // 'virtual' was specified outside of the class. 2372 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2373 << CodeModificationHint::CreateRemoval( 2374 SourceRange(D.getDeclSpec().getVirtualSpecLoc())); 2375 } else { 2376 // Okay: Add virtual to the method. 2377 cast<CXXMethodDecl>(NewFD)->setVirtualAsWritten(true); 2378 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2379 CurClass->setAggregate(false); 2380 CurClass->setPOD(false); 2381 CurClass->setPolymorphic(true); 2382 CurClass->setHasTrivialConstructor(false); 2383 CurClass->setHasTrivialCopyConstructor(false); 2384 CurClass->setHasTrivialCopyAssignment(false); 2385 } 2386 } 2387 2388 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) { 2389 // Look for virtual methods in base classes that this method might override. 2390 2391 BasePaths Paths; 2392 if (LookupInBases(cast<CXXRecordDecl>(DC), 2393 MemberLookupCriteria(NewMD), Paths)) { 2394 for (BasePaths::decl_iterator I = Paths.found_decls_begin(), 2395 E = Paths.found_decls_end(); I != E; ++I) { 2396 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2397 if (!CheckOverridingFunctionReturnType(NewMD, OldMD) && 2398 !CheckOverridingFunctionExceptionSpec(NewMD, OldMD)) 2399 NewMD->addOverriddenMethod(OldMD); 2400 } 2401 } 2402 } 2403 } 2404 2405 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 2406 !CurContext->isRecord()) { 2407 // C++ [class.static]p1: 2408 // A data or function member of a class may be declared static 2409 // in a class definition, in which case it is a static member of 2410 // the class. 2411 2412 // Complain about the 'static' specifier if it's on an out-of-line 2413 // member function definition. 2414 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2415 diag::err_static_out_of_line) 2416 << CodeModificationHint::CreateRemoval( 2417 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 2418 } 2419 2420 // Handle GNU asm-label extension (encoded as an attribute). 2421 if (Expr *E = (Expr*) D.getAsmLabel()) { 2422 // The parser guarantees this is a string. 2423 StringLiteral *SE = cast<StringLiteral>(E); 2424 NewFD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 2425 SE->getByteLength()))); 2426 } 2427 2428 // Copy the parameter declarations from the declarator D to the function 2429 // declaration NewFD, if they are available. First scavenge them into Params. 2430 llvm::SmallVector<ParmVarDecl*, 16> Params; 2431 if (D.getNumTypeObjects() > 0) { 2432 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2433 2434 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 2435 // function that takes no arguments, not a function that takes a 2436 // single void argument. 2437 // We let through "const void" here because Sema::GetTypeForDeclarator 2438 // already checks for that case. 2439 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2440 FTI.ArgInfo[0].Param && 2441 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 2442 // Empty arg list, don't push any params. 2443 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 2444 2445 // In C++, the empty parameter-type-list must be spelled "void"; a 2446 // typedef of void is not permitted. 2447 if (getLangOptions().CPlusPlus && 2448 Param->getType().getUnqualifiedType() != Context.VoidTy) 2449 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 2450 // FIXME: Leaks decl? 2451 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 2452 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2453 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 2454 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 2455 Param->setDeclContext(NewFD); 2456 Params.push_back(Param); 2457 } 2458 } 2459 2460 } else if (const FunctionProtoType *FT = R->getAsFunctionProtoType()) { 2461 // When we're declaring a function with a typedef, typeof, etc as in the 2462 // following example, we'll need to synthesize (unnamed) 2463 // parameters for use in the declaration. 2464 // 2465 // @code 2466 // typedef void fn(int); 2467 // fn f; 2468 // @endcode 2469 2470 // Synthesize a parameter for each argument type. 2471 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 2472 AE = FT->arg_type_end(); AI != AE; ++AI) { 2473 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, 2474 SourceLocation(), 0, 2475 *AI, VarDecl::None, 0); 2476 Param->setImplicit(); 2477 Params.push_back(Param); 2478 } 2479 } else { 2480 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 2481 "Should not need args for typedef of non-prototype fn"); 2482 } 2483 // Finally, we know we have the right number of parameters, install them. 2484 NewFD->setParams(Context, Params.data(), Params.size()); 2485 2486 // If name lookup finds a previous declaration that is not in the 2487 // same scope as the new declaration, this may still be an 2488 // acceptable redeclaration. 2489 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 2490 !(NewFD->hasLinkage() && 2491 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 2492 PrevDecl = 0; 2493 2494 // Perform semantic checking on the function declaration. 2495 bool OverloadableAttrRequired = false; // FIXME: HACK! 2496 CheckFunctionDeclaration(NewFD, PrevDecl, Redeclaration, 2497 /*FIXME:*/OverloadableAttrRequired); 2498 2499 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 2500 // An out-of-line member function declaration must also be a 2501 // definition (C++ [dcl.meaning]p1). 2502 if (!IsFunctionDefinition) { 2503 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2504 << D.getCXXScopeSpec().getRange(); 2505 NewFD->setInvalidDecl(); 2506 } else if (!Redeclaration && (!PrevDecl || !isa<UsingDecl>(PrevDecl))) { 2507 // The user tried to provide an out-of-line definition for a 2508 // function that is a member of a class or namespace, but there 2509 // was no such member function declared (C++ [class.mfct]p2, 2510 // C++ [namespace.memdef]p2). For example: 2511 // 2512 // class X { 2513 // void f() const; 2514 // }; 2515 // 2516 // void X::f() { } // ill-formed 2517 // 2518 // Complain about this problem, and attempt to suggest close 2519 // matches (e.g., those that differ only in cv-qualifiers and 2520 // whether the parameter types are references). 2521 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 2522 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 2523 NewFD->setInvalidDecl(); 2524 2525 LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 2526 true); 2527 assert(!Prev.isAmbiguous() && 2528 "Cannot have an ambiguity in previous-declaration lookup"); 2529 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 2530 Func != FuncEnd; ++Func) { 2531 if (isa<FunctionDecl>(*Func) && 2532 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 2533 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 2534 } 2535 2536 PrevDecl = 0; 2537 } 2538 } 2539 2540 // Handle attributes. We need to have merged decls when handling attributes 2541 // (for example to check for conflicts, etc). 2542 // FIXME: This needs to happen before we merge declarations. Then, 2543 // let attribute merging cope with attribute conflicts. 2544 ProcessDeclAttributes(S, NewFD, D); 2545 AddKnownFunctionAttributes(NewFD); 2546 2547 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 2548 // If a function name is overloadable in C, then every function 2549 // with that name must be marked "overloadable". 2550 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 2551 << Redeclaration << NewFD; 2552 if (PrevDecl) 2553 Diag(PrevDecl->getLocation(), 2554 diag::note_attribute_overloadable_prev_overload); 2555 NewFD->addAttr(::new (Context) OverloadableAttr()); 2556 } 2557 2558 // If this is a locally-scoped extern C function, update the 2559 // map of such names. 2560 if (CurContext->isFunctionOrMethod() && NewFD->isExternC(Context) 2561 && !NewFD->isInvalidDecl()) 2562 RegisterLocallyScopedExternCDecl(NewFD, PrevDecl, S); 2563 2564 // Set this FunctionDecl's range up to the right paren. 2565 NewFD->setLocEnd(D.getSourceRange().getEnd()); 2566 2567 if (FunctionTemplate && NewFD->isInvalidDecl()) 2568 FunctionTemplate->setInvalidDecl(); 2569 2570 if (FunctionTemplate) 2571 return FunctionTemplate; 2572 2573 return NewFD; 2574} 2575 2576/// \brief Perform semantic checking of a new function declaration. 2577/// 2578/// Performs semantic analysis of the new function declaration 2579/// NewFD. This routine performs all semantic checking that does not 2580/// require the actual declarator involved in the declaration, and is 2581/// used both for the declaration of functions as they are parsed 2582/// (called via ActOnDeclarator) and for the declaration of functions 2583/// that have been instantiated via C++ template instantiation (called 2584/// via InstantiateDecl). 2585/// 2586/// This sets NewFD->isInvalidDecl() to true if there was an error. 2587void Sema::CheckFunctionDeclaration(FunctionDecl *NewFD, NamedDecl *&PrevDecl, 2588 bool &Redeclaration, 2589 bool &OverloadableAttrRequired) { 2590 // If NewFD is already known erroneous, don't do any of this checking. 2591 if (NewFD->isInvalidDecl()) 2592 return; 2593 2594 if (NewFD->getResultType()->isVariablyModifiedType()) { 2595 // Functions returning a variably modified type violate C99 6.7.5.2p2 2596 // because all functions have linkage. 2597 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 2598 return NewFD->setInvalidDecl(); 2599 } 2600 2601 // Semantic checking for this function declaration (in isolation). 2602 if (getLangOptions().CPlusPlus) { 2603 // C++-specific checks. 2604 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 2605 CheckConstructor(Constructor); 2606 } else if (isa<CXXDestructorDecl>(NewFD)) { 2607 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 2608 QualType ClassType = Context.getTypeDeclType(Record); 2609 if (!ClassType->isDependentType()) { 2610 ClassType = Context.getCanonicalType(ClassType); 2611 DeclarationName Name 2612 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2613 if (NewFD->getDeclName() != Name) { 2614 Diag(NewFD->getLocation(), diag::err_destructor_name); 2615 return NewFD->setInvalidDecl(); 2616 } 2617 } 2618 Record->setUserDeclaredDestructor(true); 2619 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 2620 // user-defined destructor. 2621 Record->setPOD(false); 2622 2623 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 2624 // declared destructor. 2625 // FIXME: C++0x: don't do this for "= default" destructors 2626 Record->setHasTrivialDestructor(false); 2627 } else if (CXXConversionDecl *Conversion 2628 = dyn_cast<CXXConversionDecl>(NewFD)) 2629 ActOnConversionDeclarator(Conversion); 2630 2631 // Extra checking for C++ overloaded operators (C++ [over.oper]). 2632 if (NewFD->isOverloadedOperator() && 2633 CheckOverloadedOperatorDeclaration(NewFD)) 2634 return NewFD->setInvalidDecl(); 2635 } 2636 2637 // C99 6.7.4p6: 2638 // [... ] For a function with external linkage, the following 2639 // restrictions apply: [...] If all of the file scope declarations 2640 // for a function in a translation unit include the inline 2641 // function specifier without extern, then the definition in that 2642 // translation unit is an inline definition. An inline definition 2643 // does not provide an external definition for the function, and 2644 // does not forbid an external definition in another translation 2645 // unit. 2646 // 2647 // Here we determine whether this function, in isolation, would be a 2648 // C99 inline definition. MergeCompatibleFunctionDecls looks at 2649 // previous declarations. 2650 if (NewFD->isInline() && getLangOptions().C99 && 2651 NewFD->getStorageClass() == FunctionDecl::None && 2652 NewFD->getDeclContext()->getLookupContext()->isTranslationUnit()) 2653 NewFD->setC99InlineDefinition(true); 2654 2655 // Check for a previous declaration of this name. 2656 if (!PrevDecl && NewFD->isExternC(Context)) { 2657 // Since we did not find anything by this name and we're declaring 2658 // an extern "C" function, look for a non-visible extern "C" 2659 // declaration with the same name. 2660 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2661 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 2662 if (Pos != LocallyScopedExternalDecls.end()) 2663 PrevDecl = Pos->second; 2664 } 2665 2666 // Merge or overload the declaration with an existing declaration of 2667 // the same name, if appropriate. 2668 if (PrevDecl) { 2669 // Determine whether NewFD is an overload of PrevDecl or 2670 // a declaration that requires merging. If it's an overload, 2671 // there's no more work to do here; we'll just add the new 2672 // function to the scope. 2673 OverloadedFunctionDecl::function_iterator MatchedDecl; 2674 2675 if (!getLangOptions().CPlusPlus && 2676 AllowOverloadingOfFunction(PrevDecl, Context)) { 2677 OverloadableAttrRequired = true; 2678 2679 // Functions marked "overloadable" must have a prototype (that 2680 // we can't get through declaration merging). 2681 if (!NewFD->getType()->getAsFunctionProtoType()) { 2682 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_no_prototype) 2683 << NewFD; 2684 Redeclaration = true; 2685 2686 // Turn this into a variadic function with no parameters. 2687 QualType R = Context.getFunctionType( 2688 NewFD->getType()->getAsFunctionType()->getResultType(), 2689 0, 0, true, 0); 2690 NewFD->setType(R); 2691 return NewFD->setInvalidDecl(); 2692 } 2693 } 2694 2695 if (PrevDecl && 2696 (!AllowOverloadingOfFunction(PrevDecl, Context) || 2697 !IsOverload(NewFD, PrevDecl, MatchedDecl)) && 2698 !isa<UsingDecl>(PrevDecl)) { 2699 Redeclaration = true; 2700 Decl *OldDecl = PrevDecl; 2701 2702 // If PrevDecl was an overloaded function, extract the 2703 // FunctionDecl that matched. 2704 if (isa<OverloadedFunctionDecl>(PrevDecl)) 2705 OldDecl = *MatchedDecl; 2706 2707 // NewFD and OldDecl represent declarations that need to be 2708 // merged. 2709 if (MergeFunctionDecl(NewFD, OldDecl)) 2710 return NewFD->setInvalidDecl(); 2711 2712 if (FunctionTemplateDecl *OldTemplateDecl 2713 = dyn_cast<FunctionTemplateDecl>(OldDecl)) 2714 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 2715 else { 2716 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 2717 NewFD->setAccess(OldDecl->getAccess()); 2718 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 2719 } 2720 } 2721 } 2722 2723 // In C++, check default arguments now that we have merged decls. Unless 2724 // the lexical context is the class, because in this case this is done 2725 // during delayed parsing anyway. 2726 if (getLangOptions().CPlusPlus && !CurContext->isRecord()) 2727 CheckCXXDefaultArguments(NewFD); 2728} 2729 2730bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 2731 // FIXME: Need strict checking. In C89, we need to check for 2732 // any assignment, increment, decrement, function-calls, or 2733 // commas outside of a sizeof. In C99, it's the same list, 2734 // except that the aforementioned are allowed in unevaluated 2735 // expressions. Everything else falls under the 2736 // "may accept other forms of constant expressions" exception. 2737 // (We never end up here for C++, so the constant expression 2738 // rules there don't matter.) 2739 if (Init->isConstantInitializer(Context)) 2740 return false; 2741 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 2742 << Init->getSourceRange(); 2743 return true; 2744} 2745 2746void Sema::AddInitializerToDecl(DeclPtrTy dcl, FullExprArg init) { 2747 AddInitializerToDecl(dcl, init.release(), /*DirectInit=*/false); 2748} 2749 2750/// AddInitializerToDecl - Adds the initializer Init to the 2751/// declaration dcl. If DirectInit is true, this is C++ direct 2752/// initialization rather than copy initialization. 2753void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 2754 Decl *RealDecl = dcl.getAs<Decl>(); 2755 // If there is no declaration, there was an error parsing it. Just ignore 2756 // the initializer. 2757 if (RealDecl == 0) 2758 return; 2759 2760 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 2761 // With declarators parsed the way they are, the parser cannot 2762 // distinguish between a normal initializer and a pure-specifier. 2763 // Thus this grotesque test. 2764 IntegerLiteral *IL; 2765 Expr *Init = static_cast<Expr *>(init.get()); 2766 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 2767 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 2768 if (Method->isVirtualAsWritten()) { 2769 Method->setPure(); 2770 2771 // A class is abstract if at least one function is pure virtual. 2772 cast<CXXRecordDecl>(CurContext)->setAbstract(true); 2773 } else if (!Method->isInvalidDecl()) { 2774 Diag(Method->getLocation(), diag::err_non_virtual_pure) 2775 << Method->getDeclName() << Init->getSourceRange(); 2776 Method->setInvalidDecl(); 2777 } 2778 } else { 2779 Diag(Method->getLocation(), diag::err_member_function_initialization) 2780 << Method->getDeclName() << Init->getSourceRange(); 2781 Method->setInvalidDecl(); 2782 } 2783 return; 2784 } 2785 2786 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2787 if (!VDecl) { 2788 if (getLangOptions().CPlusPlus && 2789 RealDecl->getLexicalDeclContext()->isRecord() && 2790 isa<NamedDecl>(RealDecl)) 2791 Diag(RealDecl->getLocation(), diag::err_member_initialization) 2792 << cast<NamedDecl>(RealDecl)->getDeclName(); 2793 else 2794 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2795 RealDecl->setInvalidDecl(); 2796 return; 2797 } 2798 2799 if (!VDecl->getType()->isArrayType() && 2800 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2801 diag::err_typecheck_decl_incomplete_type)) { 2802 RealDecl->setInvalidDecl(); 2803 return; 2804 } 2805 2806 const VarDecl *Def = 0; 2807 if (VDecl->getDefinition(Def)) { 2808 Diag(VDecl->getLocation(), diag::err_redefinition) 2809 << VDecl->getDeclName(); 2810 Diag(Def->getLocation(), diag::note_previous_definition); 2811 VDecl->setInvalidDecl(); 2812 return; 2813 } 2814 2815 // Take ownership of the expression, now that we're sure we have somewhere 2816 // to put it. 2817 Expr *Init = init.takeAs<Expr>(); 2818 assert(Init && "missing initializer"); 2819 2820 // Get the decls type and save a reference for later, since 2821 // CheckInitializerTypes may change it. 2822 QualType DclT = VDecl->getType(), SavT = DclT; 2823 if (VDecl->isBlockVarDecl()) { 2824 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 2825 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2826 VDecl->setInvalidDecl(); 2827 } else if (!VDecl->isInvalidDecl()) { 2828 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2829 VDecl->getDeclName(), DirectInit)) 2830 VDecl->setInvalidDecl(); 2831 2832 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2833 // Don't check invalid declarations to avoid emitting useless diagnostics. 2834 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2835 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 2836 CheckForConstantInitializer(Init, DclT); 2837 } 2838 } 2839 } else if (VDecl->isStaticDataMember() && 2840 VDecl->getLexicalDeclContext()->isRecord()) { 2841 // This is an in-class initialization for a static data member, e.g., 2842 // 2843 // struct S { 2844 // static const int value = 17; 2845 // }; 2846 2847 // Attach the initializer 2848 VDecl->setInit(Context, Init); 2849 2850 // C++ [class.mem]p4: 2851 // A member-declarator can contain a constant-initializer only 2852 // if it declares a static member (9.4) of const integral or 2853 // const enumeration type, see 9.4.2. 2854 QualType T = VDecl->getType(); 2855 if (!T->isDependentType() && 2856 (!Context.getCanonicalType(T).isConstQualified() || 2857 !T->isIntegralType())) { 2858 Diag(VDecl->getLocation(), diag::err_member_initialization) 2859 << VDecl->getDeclName() << Init->getSourceRange(); 2860 VDecl->setInvalidDecl(); 2861 } else { 2862 // C++ [class.static.data]p4: 2863 // If a static data member is of const integral or const 2864 // enumeration type, its declaration in the class definition 2865 // can specify a constant-initializer which shall be an 2866 // integral constant expression (5.19). 2867 if (!Init->isTypeDependent() && 2868 !Init->getType()->isIntegralType()) { 2869 // We have a non-dependent, non-integral or enumeration type. 2870 Diag(Init->getSourceRange().getBegin(), 2871 diag::err_in_class_initializer_non_integral_type) 2872 << Init->getType() << Init->getSourceRange(); 2873 VDecl->setInvalidDecl(); 2874 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 2875 // Check whether the expression is a constant expression. 2876 llvm::APSInt Value; 2877 SourceLocation Loc; 2878 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 2879 Diag(Loc, diag::err_in_class_initializer_non_constant) 2880 << Init->getSourceRange(); 2881 VDecl->setInvalidDecl(); 2882 } else if (!VDecl->getType()->isDependentType()) 2883 ImpCastExprToType(Init, VDecl->getType()); 2884 } 2885 } 2886 } else if (VDecl->isFileVarDecl()) { 2887 if (VDecl->getStorageClass() == VarDecl::Extern) 2888 Diag(VDecl->getLocation(), diag::warn_extern_init); 2889 if (!VDecl->isInvalidDecl()) 2890 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2891 VDecl->getDeclName(), DirectInit)) 2892 VDecl->setInvalidDecl(); 2893 2894 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2895 // Don't check invalid declarations to avoid emitting useless diagnostics. 2896 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2897 // C99 6.7.8p4. All file scoped initializers need to be constant. 2898 CheckForConstantInitializer(Init, DclT); 2899 } 2900 } 2901 // If the type changed, it means we had an incomplete type that was 2902 // completed by the initializer. For example: 2903 // int ary[] = { 1, 3, 5 }; 2904 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2905 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2906 VDecl->setType(DclT); 2907 Init->setType(DclT); 2908 } 2909 2910 // Attach the initializer to the decl. 2911 VDecl->setInit(Context, Init); 2912 2913 // If the previous declaration of VDecl was a tentative definition, 2914 // remove it from the set of tentative definitions. 2915 if (VDecl->getPreviousDeclaration() && 2916 VDecl->getPreviousDeclaration()->isTentativeDefinition(Context)) { 2917 llvm::DenseMap<DeclarationName, VarDecl *>::iterator Pos 2918 = TentativeDefinitions.find(VDecl->getDeclName()); 2919 assert(Pos != TentativeDefinitions.end() && 2920 "Unrecorded tentative definition?"); 2921 TentativeDefinitions.erase(Pos); 2922 } 2923 2924 return; 2925} 2926 2927void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 2928 bool TypeContainsUndeducedAuto) { 2929 Decl *RealDecl = dcl.getAs<Decl>(); 2930 2931 // If there is no declaration, there was an error parsing it. Just ignore it. 2932 if (RealDecl == 0) 2933 return; 2934 2935 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2936 QualType Type = Var->getType(); 2937 2938 // Record tentative definitions. 2939 if (Var->isTentativeDefinition(Context)) 2940 TentativeDefinitions[Var->getDeclName()] = Var; 2941 2942 // C++ [dcl.init.ref]p3: 2943 // The initializer can be omitted for a reference only in a 2944 // parameter declaration (8.3.5), in the declaration of a 2945 // function return type, in the declaration of a class member 2946 // within its class declaration (9.2), and where the extern 2947 // specifier is explicitly used. 2948 if (Type->isReferenceType() && !Var->hasExternalStorage()) { 2949 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2950 << Var->getDeclName() 2951 << SourceRange(Var->getLocation(), Var->getLocation()); 2952 Var->setInvalidDecl(); 2953 return; 2954 } 2955 2956 // C++0x [dcl.spec.auto]p3 2957 if (TypeContainsUndeducedAuto) { 2958 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 2959 << Var->getDeclName() << Type; 2960 Var->setInvalidDecl(); 2961 return; 2962 } 2963 2964 // C++ [dcl.init]p9: 2965 // 2966 // If no initializer is specified for an object, and the object 2967 // is of (possibly cv-qualified) non-POD class type (or array 2968 // thereof), the object shall be default-initialized; if the 2969 // object is of const-qualified type, the underlying class type 2970 // shall have a user-declared default constructor. 2971 if (getLangOptions().CPlusPlus) { 2972 QualType InitType = Type; 2973 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2974 InitType = Array->getElementType(); 2975 if ((!Var->hasExternalStorage() && !Var->isExternC(Context)) && 2976 InitType->isRecordType() && !InitType->isDependentType()) { 2977 CXXRecordDecl *RD = 2978 cast<CXXRecordDecl>(InitType->getAsRecordType()->getDecl()); 2979 CXXConstructorDecl *Constructor = 0; 2980 if (!RequireCompleteType(Var->getLocation(), InitType, 2981 diag::err_invalid_incomplete_type_use)) 2982 Constructor 2983 = PerformInitializationByConstructor(InitType, 0, 0, 2984 Var->getLocation(), 2985 SourceRange(Var->getLocation(), 2986 Var->getLocation()), 2987 Var->getDeclName(), 2988 IK_Default); 2989 if (!Constructor) 2990 Var->setInvalidDecl(); 2991 else { 2992 if (!RD->hasTrivialConstructor()) 2993 InitializeVarWithConstructor(Var, Constructor, InitType, 0, 0); 2994 // FIXME. Must do all that is needed to destroy the object 2995 // on scope exit. For now, just mark the destructor as used. 2996 MarkDestructorReferenced(Var->getLocation(), InitType); 2997 } 2998 } 2999 } 3000 3001#if 0 3002 // FIXME: Temporarily disabled because we are not properly parsing 3003 // linkage specifications on declarations, e.g., 3004 // 3005 // extern "C" const CGPoint CGPointerZero; 3006 // 3007 // C++ [dcl.init]p9: 3008 // 3009 // If no initializer is specified for an object, and the 3010 // object is of (possibly cv-qualified) non-POD class type (or 3011 // array thereof), the object shall be default-initialized; if 3012 // the object is of const-qualified type, the underlying class 3013 // type shall have a user-declared default 3014 // constructor. Otherwise, if no initializer is specified for 3015 // an object, the object and its subobjects, if any, have an 3016 // indeterminate initial value; if the object or any of its 3017 // subobjects are of const-qualified type, the program is 3018 // ill-formed. 3019 // 3020 // This isn't technically an error in C, so we don't diagnose it. 3021 // 3022 // FIXME: Actually perform the POD/user-defined default 3023 // constructor check. 3024 if (getLangOptions().CPlusPlus && 3025 Context.getCanonicalType(Type).isConstQualified() && 3026 !Var->hasExternalStorage()) 3027 Diag(Var->getLocation(), diag::err_const_var_requires_init) 3028 << Var->getName() 3029 << SourceRange(Var->getLocation(), Var->getLocation()); 3030#endif 3031 } 3032} 3033 3034Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 3035 DeclPtrTy *Group, 3036 unsigned NumDecls) { 3037 llvm::SmallVector<Decl*, 8> Decls; 3038 3039 if (DS.isTypeSpecOwned()) 3040 Decls.push_back((Decl*)DS.getTypeRep()); 3041 3042 for (unsigned i = 0; i != NumDecls; ++i) 3043 if (Decl *D = Group[i].getAs<Decl>()) 3044 Decls.push_back(D); 3045 3046 // Perform semantic analysis that depends on having fully processed both 3047 // the declarator and initializer. 3048 for (unsigned i = 0, e = Decls.size(); i != e; ++i) { 3049 VarDecl *IDecl = dyn_cast<VarDecl>(Decls[i]); 3050 if (!IDecl) 3051 continue; 3052 QualType T = IDecl->getType(); 3053 3054 // Block scope. C99 6.7p7: If an identifier for an object is declared with 3055 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 3056 if (IDecl->isBlockVarDecl() && !IDecl->hasExternalStorage()) { 3057 if (!IDecl->isInvalidDecl() && 3058 RequireCompleteType(IDecl->getLocation(), T, 3059 diag::err_typecheck_decl_incomplete_type)) 3060 IDecl->setInvalidDecl(); 3061 } 3062 // File scope. C99 6.9.2p2: A declaration of an identifier for an 3063 // object that has file scope without an initializer, and without a 3064 // storage-class specifier or with the storage-class specifier "static", 3065 // constitutes a tentative definition. Note: A tentative definition with 3066 // external linkage is valid (C99 6.2.2p5). 3067 if (IDecl->isTentativeDefinition(Context) && !IDecl->isInvalidDecl()) { 3068 if (const IncompleteArrayType *ArrayT 3069 = Context.getAsIncompleteArrayType(T)) { 3070 if (RequireCompleteType(IDecl->getLocation(), 3071 ArrayT->getElementType(), 3072 diag::err_illegal_decl_array_incomplete_type)) 3073 IDecl->setInvalidDecl(); 3074 } 3075 else if (IDecl->getStorageClass() == VarDecl::Static) { 3076 // C99 6.9.2p3: If the declaration of an identifier for an object is 3077 // a tentative definition and has internal linkage (C99 6.2.2p3), the 3078 // declared type shall not be an incomplete type. 3079 // NOTE: code such as the following 3080 // static struct s; 3081 // struct s { int a; }; 3082 // is accepted by gcc. Hence here we issue a warning instead of 3083 // an error and we do not invalidate the static declaration. 3084 // NOTE: to avoid multiple warnings, only check the first declaration. 3085 if (IDecl->getPreviousDeclaration() == 0) 3086 RequireCompleteType(IDecl->getLocation(), T, 3087 diag::ext_typecheck_decl_incomplete_type); 3088 } 3089 } 3090 } 3091 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 3092 Decls.data(), Decls.size())); 3093} 3094 3095 3096/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 3097/// to introduce parameters into function prototype scope. 3098Sema::DeclPtrTy 3099Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 3100 const DeclSpec &DS = D.getDeclSpec(); 3101 3102 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 3103 VarDecl::StorageClass StorageClass = VarDecl::None; 3104 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 3105 StorageClass = VarDecl::Register; 3106 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 3107 Diag(DS.getStorageClassSpecLoc(), 3108 diag::err_invalid_storage_class_in_func_decl); 3109 D.getMutableDeclSpec().ClearStorageClassSpecs(); 3110 } 3111 3112 if (D.getDeclSpec().isThreadSpecified()) 3113 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3114 3115 DiagnoseFunctionSpecifiers(D); 3116 3117 // Check that there are no default arguments inside the type of this 3118 // parameter (C++ only). 3119 if (getLangOptions().CPlusPlus) 3120 CheckExtraCXXDefaultArguments(D); 3121 3122 TagDecl *OwnedDecl = 0; 3123 QualType parmDeclType = GetTypeForDeclarator(D, S, /*Skip=*/0, &OwnedDecl); 3124 3125 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 3126 // C++ [dcl.fct]p6: 3127 // Types shall not be defined in return or parameter types. 3128 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 3129 << Context.getTypeDeclType(OwnedDecl); 3130 } 3131 3132 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 3133 // Can this happen for params? We already checked that they don't conflict 3134 // among each other. Here they can only shadow globals, which is ok. 3135 IdentifierInfo *II = D.getIdentifier(); 3136 if (II) { 3137 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3138 if (PrevDecl->isTemplateParameter()) { 3139 // Maybe we will complain about the shadowed template parameter. 3140 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3141 // Just pretend that we didn't see the previous declaration. 3142 PrevDecl = 0; 3143 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 3144 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 3145 3146 // Recover by removing the name 3147 II = 0; 3148 D.SetIdentifier(0, D.getIdentifierLoc()); 3149 } 3150 } 3151 } 3152 3153 // Parameters can not be abstract class types. 3154 // For record types, this is done by the AbstractClassUsageDiagnoser once 3155 // the class has been completely parsed. 3156 if (!CurContext->isRecord() && 3157 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 3158 diag::err_abstract_type_in_decl, 3159 AbstractParamType)) 3160 D.setInvalidType(true); 3161 3162 QualType T = adjustParameterType(parmDeclType); 3163 3164 ParmVarDecl *New; 3165 if (T == parmDeclType) // parameter type did not need adjustment 3166 New = ParmVarDecl::Create(Context, CurContext, 3167 D.getIdentifierLoc(), II, 3168 parmDeclType, StorageClass, 3169 0); 3170 else // keep track of both the adjusted and unadjusted types 3171 New = OriginalParmVarDecl::Create(Context, CurContext, 3172 D.getIdentifierLoc(), II, T, 3173 parmDeclType, StorageClass, 0); 3174 3175 if (D.isInvalidType()) 3176 New->setInvalidDecl(); 3177 3178 // Parameter declarators cannot be interface types. All ObjC objects are 3179 // passed by reference. 3180 if (T->isObjCInterfaceType()) { 3181 Diag(D.getIdentifierLoc(), 3182 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 3183 New->setInvalidDecl(); 3184 } 3185 3186 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 3187 if (D.getCXXScopeSpec().isSet()) { 3188 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 3189 << D.getCXXScopeSpec().getRange(); 3190 New->setInvalidDecl(); 3191 } 3192 3193 // Add the parameter declaration into this scope. 3194 S->AddDecl(DeclPtrTy::make(New)); 3195 if (II) 3196 IdResolver.AddDecl(New); 3197 3198 ProcessDeclAttributes(S, New, D); 3199 3200 if (New->hasAttr<BlocksAttr>()) { 3201 Diag(New->getLocation(), diag::err_block_on_nonlocal); 3202 } 3203 return DeclPtrTy::make(New); 3204} 3205 3206void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 3207 SourceLocation LocAfterDecls) { 3208 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3209 "Not a function declarator!"); 3210 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3211 3212 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 3213 // for a K&R function. 3214 if (!FTI.hasPrototype) { 3215 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 3216 --i; 3217 if (FTI.ArgInfo[i].Param == 0) { 3218 std::string Code = " int "; 3219 Code += FTI.ArgInfo[i].Ident->getName(); 3220 Code += ";\n"; 3221 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 3222 << FTI.ArgInfo[i].Ident 3223 << CodeModificationHint::CreateInsertion(LocAfterDecls, Code); 3224 3225 // Implicitly declare the argument as type 'int' for lack of a better 3226 // type. 3227 DeclSpec DS; 3228 const char* PrevSpec; // unused 3229 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 3230 PrevSpec); 3231 Declarator ParamD(DS, Declarator::KNRTypeListContext); 3232 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 3233 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 3234 } 3235 } 3236 } 3237} 3238 3239Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 3240 Declarator &D) { 3241 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 3242 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3243 "Not a function declarator!"); 3244 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3245 3246 if (FTI.hasPrototype) { 3247 // FIXME: Diagnose arguments without names in C. 3248 } 3249 3250 Scope *ParentScope = FnBodyScope->getParent(); 3251 3252 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 3253 MultiTemplateParamsArg(*this), 3254 /*IsFunctionDefinition=*/true); 3255 return ActOnStartOfFunctionDef(FnBodyScope, DP); 3256} 3257 3258Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 3259 if (!D) 3260 return D; 3261 FunctionDecl *FD = cast<FunctionDecl>(D.getAs<Decl>()); 3262 3263 CurFunctionNeedsScopeChecking = false; 3264 3265 // See if this is a redefinition. 3266 const FunctionDecl *Definition; 3267 if (FD->getBody(Definition)) { 3268 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 3269 Diag(Definition->getLocation(), diag::note_previous_definition); 3270 } 3271 3272 // Builtin functions cannot be defined. 3273 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 3274 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 3275 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 3276 FD->setInvalidDecl(); 3277 } 3278 } 3279 3280 // The return type of a function definition must be complete 3281 // (C99 6.9.1p3, C++ [dcl.fct]p6). 3282 QualType ResultType = FD->getResultType(); 3283 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 3284 !FD->isInvalidDecl() && 3285 RequireCompleteType(FD->getLocation(), ResultType, 3286 diag::err_func_def_incomplete_result)) 3287 FD->setInvalidDecl(); 3288 3289 // GNU warning -Wmissing-prototypes: 3290 // Warn if a global function is defined without a previous 3291 // prototype declaration. This warning is issued even if the 3292 // definition itself provides a prototype. The aim is to detect 3293 // global functions that fail to be declared in header files. 3294 if (!FD->isInvalidDecl() && FD->isGlobal() && !isa<CXXMethodDecl>(FD) && 3295 !FD->isMain()) { 3296 bool MissingPrototype = true; 3297 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 3298 Prev; Prev = Prev->getPreviousDeclaration()) { 3299 // Ignore any declarations that occur in function or method 3300 // scope, because they aren't visible from the header. 3301 if (Prev->getDeclContext()->isFunctionOrMethod()) 3302 continue; 3303 3304 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 3305 break; 3306 } 3307 3308 if (MissingPrototype) 3309 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 3310 } 3311 3312 if (FnBodyScope) 3313 PushDeclContext(FnBodyScope, FD); 3314 3315 // Check the validity of our function parameters 3316 CheckParmsForFunctionDef(FD); 3317 3318 // Introduce our parameters into the function scope 3319 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 3320 ParmVarDecl *Param = FD->getParamDecl(p); 3321 Param->setOwningFunction(FD); 3322 3323 // If this has an identifier, add it to the scope stack. 3324 if (Param->getIdentifier() && FnBodyScope) 3325 PushOnScopeChains(Param, FnBodyScope); 3326 } 3327 3328 // Checking attributes of current function definition 3329 // dllimport attribute. 3330 if (FD->getAttr<DLLImportAttr>() && 3331 (!FD->getAttr<DLLExportAttr>())) { 3332 // dllimport attribute cannot be applied to definition. 3333 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 3334 Diag(FD->getLocation(), 3335 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 3336 << "dllimport"; 3337 FD->setInvalidDecl(); 3338 return DeclPtrTy::make(FD); 3339 } else { 3340 // If a symbol previously declared dllimport is later defined, the 3341 // attribute is ignored in subsequent references, and a warning is 3342 // emitted. 3343 Diag(FD->getLocation(), 3344 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 3345 << FD->getNameAsCString() << "dllimport"; 3346 } 3347 } 3348 return DeclPtrTy::make(FD); 3349} 3350 3351Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 3352 return ActOnFinishFunctionBody(D, move(BodyArg), false); 3353} 3354 3355Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 3356 bool IsInstantiation) { 3357 Decl *dcl = D.getAs<Decl>(); 3358 Stmt *Body = BodyArg.takeAs<Stmt>(); 3359 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 3360 FD->setBody(Body); 3361 if (!FD->getResultType()->isVoidType() 3362 // C and C++ allow for main to automagically return 0. 3363 && !FD->isMain()) 3364 CheckFallThroughForFunctionDef(FD, Body); 3365 3366 if (!FD->isInvalidDecl()) 3367 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 3368 3369 // C++ [basic.def.odr]p2: 3370 // [...] A virtual member function is used if it is not pure. [...] 3371 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 3372 if (Method->isVirtual() && !Method->isPure()) 3373 MarkDeclarationReferenced(Method->getLocation(), Method); 3374 3375 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 3376 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 3377 assert(MD == getCurMethodDecl() && "Method parsing confused"); 3378 MD->setBody(Body); 3379 if (!MD->getResultType()->isVoidType()) 3380 CheckFallThroughForFunctionDef(MD, Body); 3381 MD->setEndLoc(Body->getLocEnd()); 3382 3383 if (!MD->isInvalidDecl()) 3384 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 3385 } else { 3386 Body->Destroy(Context); 3387 return DeclPtrTy(); 3388 } 3389 if (!IsInstantiation) 3390 PopDeclContext(); 3391 3392 // Verify and clean out per-function state. 3393 3394 assert(&getLabelMap() == &FunctionLabelMap && "Didn't pop block right?"); 3395 3396 // Check goto/label use. 3397 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 3398 I = FunctionLabelMap.begin(), E = FunctionLabelMap.end(); I != E; ++I) { 3399 LabelStmt *L = I->second; 3400 3401 // Verify that we have no forward references left. If so, there was a goto 3402 // or address of a label taken, but no definition of it. Label fwd 3403 // definitions are indicated with a null substmt. 3404 if (L->getSubStmt() != 0) 3405 continue; 3406 3407 // Emit error. 3408 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 3409 3410 // At this point, we have gotos that use the bogus label. Stitch it into 3411 // the function body so that they aren't leaked and that the AST is well 3412 // formed. 3413 if (Body == 0) { 3414 // The whole function wasn't parsed correctly, just delete this. 3415 L->Destroy(Context); 3416 continue; 3417 } 3418 3419 // Otherwise, the body is valid: we want to stitch the label decl into the 3420 // function somewhere so that it is properly owned and so that the goto 3421 // has a valid target. Do this by creating a new compound stmt with the 3422 // label in it. 3423 3424 // Give the label a sub-statement. 3425 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 3426 3427 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 3428 cast<CXXTryStmt>(Body)->getTryBlock() : 3429 cast<CompoundStmt>(Body); 3430 std::vector<Stmt*> Elements(Compound->body_begin(), Compound->body_end()); 3431 Elements.push_back(L); 3432 Compound->setStmts(Context, &Elements[0], Elements.size()); 3433 } 3434 FunctionLabelMap.clear(); 3435 3436 if (!Body) return D; 3437 3438 // Verify that that gotos and switch cases don't jump into scopes illegally. 3439 if (CurFunctionNeedsScopeChecking) 3440 DiagnoseInvalidJumps(Body); 3441 3442 // C++ constructors that have function-try-blocks can't have return 3443 // statements in the handlers of that block. (C++ [except.handle]p14) 3444 // Verify this. 3445 if (isa<CXXConstructorDecl>(dcl) && isa<CXXTryStmt>(Body)) 3446 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 3447 3448 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 3449 Destructor->computeBaseOrMembersToDestroy(Context); 3450 return D; 3451} 3452 3453/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 3454/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 3455NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 3456 IdentifierInfo &II, Scope *S) { 3457 // Before we produce a declaration for an implicitly defined 3458 // function, see whether there was a locally-scoped declaration of 3459 // this name as a function or variable. If so, use that 3460 // (non-visible) declaration, and complain about it. 3461 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3462 = LocallyScopedExternalDecls.find(&II); 3463 if (Pos != LocallyScopedExternalDecls.end()) { 3464 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 3465 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 3466 return Pos->second; 3467 } 3468 3469 // Extension in C99. Legal in C90, but warn about it. 3470 if (getLangOptions().C99) 3471 Diag(Loc, diag::ext_implicit_function_decl) << &II; 3472 else 3473 Diag(Loc, diag::warn_implicit_function_decl) << &II; 3474 3475 // FIXME: handle stuff like: 3476 // void foo() { extern float X(); } 3477 // void bar() { X(); } <-- implicit decl for X in another scope. 3478 3479 // Set a Declarator for the implicit definition: int foo(); 3480 const char *Dummy; 3481 DeclSpec DS; 3482 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 3483 Error = Error; // Silence warning. 3484 assert(!Error && "Error setting up implicit decl!"); 3485 Declarator D(DS, Declarator::BlockContext); 3486 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 3487 0, 0, false, SourceLocation(), 3488 false, 0,0,0, Loc, D), 3489 SourceLocation()); 3490 D.SetIdentifier(&II, Loc); 3491 3492 // Insert this function into translation-unit scope. 3493 3494 DeclContext *PrevDC = CurContext; 3495 CurContext = Context.getTranslationUnitDecl(); 3496 3497 FunctionDecl *FD = 3498 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 3499 FD->setImplicit(); 3500 3501 CurContext = PrevDC; 3502 3503 AddKnownFunctionAttributes(FD); 3504 3505 return FD; 3506} 3507 3508/// \brief Adds any function attributes that we know a priori based on 3509/// the declaration of this function. 3510/// 3511/// These attributes can apply both to implicitly-declared builtins 3512/// (like __builtin___printf_chk) or to library-declared functions 3513/// like NSLog or printf. 3514void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 3515 if (FD->isInvalidDecl()) 3516 return; 3517 3518 // If this is a built-in function, map its builtin attributes to 3519 // actual attributes. 3520 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 3521 // Handle printf-formatting attributes. 3522 unsigned FormatIdx; 3523 bool HasVAListArg; 3524 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 3525 if (!FD->getAttr<FormatAttr>()) 3526 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 3527 HasVAListArg ? 0 : FormatIdx + 2)); 3528 } 3529 3530 // Mark const if we don't care about errno and that is the only 3531 // thing preventing the function from being const. This allows 3532 // IRgen to use LLVM intrinsics for such functions. 3533 if (!getLangOptions().MathErrno && 3534 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 3535 if (!FD->getAttr<ConstAttr>()) 3536 FD->addAttr(::new (Context) ConstAttr()); 3537 } 3538 } 3539 3540 IdentifierInfo *Name = FD->getIdentifier(); 3541 if (!Name) 3542 return; 3543 if ((!getLangOptions().CPlusPlus && 3544 FD->getDeclContext()->isTranslationUnit()) || 3545 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 3546 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 3547 LinkageSpecDecl::lang_c)) { 3548 // Okay: this could be a libc/libm/Objective-C function we know 3549 // about. 3550 } else 3551 return; 3552 3553 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 3554 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 3555 // FIXME: We known better than our headers. 3556 const_cast<FormatAttr *>(Format)->setType("printf"); 3557 } else 3558 FD->addAttr(::new (Context) FormatAttr("printf", 1, 3559 Name->isStr("NSLogv") ? 0 : 2)); 3560 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 3561 if (!FD->getAttr<FormatAttr>()) 3562 FD->addAttr(::new (Context) FormatAttr("printf", 2, 3563 Name->isStr("vasprintf") ? 0 : 3)); 3564 } 3565} 3566 3567TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T) { 3568 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 3569 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3570 3571 // Scope manipulation handled by caller. 3572 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 3573 D.getIdentifierLoc(), 3574 D.getIdentifier(), 3575 T); 3576 3577 if (TagType *TT = dyn_cast<TagType>(T)) { 3578 TagDecl *TD = TT->getDecl(); 3579 3580 // If the TagDecl that the TypedefDecl points to is an anonymous decl 3581 // keep track of the TypedefDecl. 3582 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 3583 TD->setTypedefForAnonDecl(NewTD); 3584 } 3585 3586 if (D.isInvalidType()) 3587 NewTD->setInvalidDecl(); 3588 return NewTD; 3589} 3590 3591 3592/// \brief Determine whether a tag with a given kind is acceptable 3593/// as a redeclaration of the given tag declaration. 3594/// 3595/// \returns true if the new tag kind is acceptable, false otherwise. 3596bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 3597 TagDecl::TagKind NewTag, 3598 SourceLocation NewTagLoc, 3599 const IdentifierInfo &Name) { 3600 // C++ [dcl.type.elab]p3: 3601 // The class-key or enum keyword present in the 3602 // elaborated-type-specifier shall agree in kind with the 3603 // declaration to which the name in theelaborated-type-specifier 3604 // refers. This rule also applies to the form of 3605 // elaborated-type-specifier that declares a class-name or 3606 // friend class since it can be construed as referring to the 3607 // definition of the class. Thus, in any 3608 // elaborated-type-specifier, the enum keyword shall be used to 3609 // refer to an enumeration (7.2), the union class-keyshall be 3610 // used to refer to a union (clause 9), and either the class or 3611 // struct class-key shall be used to refer to a class (clause 9) 3612 // declared using the class or struct class-key. 3613 TagDecl::TagKind OldTag = Previous->getTagKind(); 3614 if (OldTag == NewTag) 3615 return true; 3616 3617 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 3618 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 3619 // Warn about the struct/class tag mismatch. 3620 bool isTemplate = false; 3621 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 3622 isTemplate = Record->getDescribedClassTemplate(); 3623 3624 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 3625 << (NewTag == TagDecl::TK_class) 3626 << isTemplate << &Name 3627 << CodeModificationHint::CreateReplacement(SourceRange(NewTagLoc), 3628 OldTag == TagDecl::TK_class? "class" : "struct"); 3629 Diag(Previous->getLocation(), diag::note_previous_use); 3630 return true; 3631 } 3632 return false; 3633} 3634 3635/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 3636/// former case, Name will be non-null. In the later case, Name will be null. 3637/// TagSpec indicates what kind of tag this is. TK indicates whether this is a 3638/// reference/declaration/definition of a tag. 3639Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, 3640 SourceLocation KWLoc, const CXXScopeSpec &SS, 3641 IdentifierInfo *Name, SourceLocation NameLoc, 3642 AttributeList *Attr, AccessSpecifier AS, 3643 MultiTemplateParamsArg TemplateParameterLists, 3644 bool &OwnedDecl) { 3645 // If this is not a definition, it must have a name. 3646 assert((Name != 0 || TK == TK_Definition) && 3647 "Nameless record must be a definition!"); 3648 3649 OwnedDecl = false; 3650 TagDecl::TagKind Kind; 3651 switch (TagSpec) { 3652 default: assert(0 && "Unknown tag type!"); 3653 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 3654 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 3655 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 3656 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 3657 } 3658 3659 if (TK != TK_Reference) { 3660 if (TemplateParameterList *TemplateParams 3661 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 3662 (TemplateParameterList**)TemplateParameterLists.get(), 3663 TemplateParameterLists.size())) { 3664 if (TemplateParams->size() > 0) { 3665 // This is a declaration or definition of a class template (which may 3666 // be a member of another template). 3667 OwnedDecl = false; 3668 DeclResult Result = ActOnClassTemplate(S, TagSpec, TK, KWLoc, 3669 SS, Name, NameLoc, Attr, 3670 move(TemplateParameterLists), 3671 AS); 3672 return Result.get(); 3673 } else { 3674 // FIXME: diagnose the extraneous 'template<>', once we recover 3675 // slightly better in ParseTemplate.cpp from bogus template 3676 // parameters. 3677 } 3678 } 3679 } 3680 3681 DeclContext *SearchDC = CurContext; 3682 DeclContext *DC = CurContext; 3683 NamedDecl *PrevDecl = 0; 3684 3685 bool Invalid = false; 3686 3687 if (Name && SS.isNotEmpty()) { 3688 // We have a nested-name tag ('struct foo::bar'). 3689 3690 // Check for invalid 'foo::'. 3691 if (SS.isInvalid()) { 3692 Name = 0; 3693 goto CreateNewDecl; 3694 } 3695 3696 if (RequireCompleteDeclContext(SS)) 3697 return DeclPtrTy::make((Decl *)0); 3698 3699 DC = computeDeclContext(SS, true); 3700 SearchDC = DC; 3701 // Look-up name inside 'foo::'. 3702 PrevDecl 3703 = dyn_cast_or_null<TagDecl>( 3704 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 3705 3706 // A tag 'foo::bar' must already exist. 3707 if (PrevDecl == 0) { 3708 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 3709 Name = 0; 3710 Invalid = true; 3711 goto CreateNewDecl; 3712 } 3713 } else if (Name) { 3714 // If this is a named struct, check to see if there was a previous forward 3715 // declaration or definition. 3716 // FIXME: We're looking into outer scopes here, even when we 3717 // shouldn't be. Doing so can result in ambiguities that we 3718 // shouldn't be diagnosing. 3719 LookupResult R = LookupName(S, Name, LookupTagName, 3720 /*RedeclarationOnly=*/(TK != TK_Reference)); 3721 if (R.isAmbiguous()) { 3722 DiagnoseAmbiguousLookup(R, Name, NameLoc); 3723 // FIXME: This is not best way to recover from case like: 3724 // 3725 // struct S s; 3726 // 3727 // causes needless "incomplete type" error later. 3728 Name = 0; 3729 PrevDecl = 0; 3730 Invalid = true; 3731 } 3732 else 3733 PrevDecl = R; 3734 3735 if (!getLangOptions().CPlusPlus && TK != TK_Reference) { 3736 // FIXME: This makes sure that we ignore the contexts associated 3737 // with C structs, unions, and enums when looking for a matching 3738 // tag declaration or definition. See the similar lookup tweak 3739 // in Sema::LookupName; is there a better way to deal with this? 3740 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 3741 SearchDC = SearchDC->getParent(); 3742 } 3743 } 3744 3745 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3746 // Maybe we will complain about the shadowed template parameter. 3747 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 3748 // Just pretend that we didn't see the previous declaration. 3749 PrevDecl = 0; 3750 } 3751 3752 if (PrevDecl) { 3753 // Check whether the previous declaration is usable. 3754 (void)DiagnoseUseOfDecl(PrevDecl, NameLoc); 3755 3756 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 3757 // If this is a use of a previous tag, or if the tag is already declared 3758 // in the same scope (so that the definition/declaration completes or 3759 // rementions the tag), reuse the decl. 3760 if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { 3761 // Make sure that this wasn't declared as an enum and now used as a 3762 // struct or something similar. 3763 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 3764 bool SafeToContinue 3765 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 3766 Kind != TagDecl::TK_enum); 3767 if (SafeToContinue) 3768 Diag(KWLoc, diag::err_use_with_wrong_tag) 3769 << Name 3770 << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), 3771 PrevTagDecl->getKindName()); 3772 else 3773 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 3774 Diag(PrevDecl->getLocation(), diag::note_previous_use); 3775 3776 if (SafeToContinue) 3777 Kind = PrevTagDecl->getTagKind(); 3778 else { 3779 // Recover by making this an anonymous redefinition. 3780 Name = 0; 3781 PrevDecl = 0; 3782 Invalid = true; 3783 } 3784 } 3785 3786 if (!Invalid) { 3787 // If this is a use, just return the declaration we found. 3788 3789 // FIXME: In the future, return a variant or some other clue 3790 // for the consumer of this Decl to know it doesn't own it. 3791 // For our current ASTs this shouldn't be a problem, but will 3792 // need to be changed with DeclGroups. 3793 if (TK == TK_Reference) 3794 return DeclPtrTy::make(PrevDecl); 3795 3796 // Diagnose attempts to redefine a tag. 3797 if (TK == TK_Definition) { 3798 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 3799 Diag(NameLoc, diag::err_redefinition) << Name; 3800 Diag(Def->getLocation(), diag::note_previous_definition); 3801 // If this is a redefinition, recover by making this 3802 // struct be anonymous, which will make any later 3803 // references get the previous definition. 3804 Name = 0; 3805 PrevDecl = 0; 3806 Invalid = true; 3807 } else { 3808 // If the type is currently being defined, complain 3809 // about a nested redefinition. 3810 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 3811 if (Tag->isBeingDefined()) { 3812 Diag(NameLoc, diag::err_nested_redefinition) << Name; 3813 Diag(PrevTagDecl->getLocation(), 3814 diag::note_previous_definition); 3815 Name = 0; 3816 PrevDecl = 0; 3817 Invalid = true; 3818 } 3819 } 3820 3821 // Okay, this is definition of a previously declared or referenced 3822 // tag PrevDecl. We're going to create a new Decl for it. 3823 } 3824 } 3825 // If we get here we have (another) forward declaration or we 3826 // have a definition. Just create a new decl. 3827 } else { 3828 // If we get here, this is a definition of a new tag type in a nested 3829 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 3830 // new decl/type. We set PrevDecl to NULL so that the entities 3831 // have distinct types. 3832 PrevDecl = 0; 3833 } 3834 // If we get here, we're going to create a new Decl. If PrevDecl 3835 // is non-NULL, it's a definition of the tag declared by 3836 // PrevDecl. If it's NULL, we have a new definition. 3837 } else { 3838 // PrevDecl is a namespace, template, or anything else 3839 // that lives in the IDNS_Tag identifier namespace. 3840 if (isDeclInScope(PrevDecl, SearchDC, S)) { 3841 // The tag name clashes with a namespace name, issue an error and 3842 // recover by making this tag be anonymous. 3843 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 3844 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3845 Name = 0; 3846 PrevDecl = 0; 3847 Invalid = true; 3848 } else { 3849 // The existing declaration isn't relevant to us; we're in a 3850 // new scope, so clear out the previous declaration. 3851 PrevDecl = 0; 3852 } 3853 } 3854 } else if (TK == TK_Reference && SS.isEmpty() && Name && 3855 (Kind != TagDecl::TK_enum || !getLangOptions().CPlusPlus)) { 3856 // C++ [basic.scope.pdecl]p5: 3857 // -- for an elaborated-type-specifier of the form 3858 // 3859 // class-key identifier 3860 // 3861 // if the elaborated-type-specifier is used in the 3862 // decl-specifier-seq or parameter-declaration-clause of a 3863 // function defined in namespace scope, the identifier is 3864 // declared as a class-name in the namespace that contains 3865 // the declaration; otherwise, except as a friend 3866 // declaration, the identifier is declared in the smallest 3867 // non-class, non-function-prototype scope that contains the 3868 // declaration. 3869 // 3870 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 3871 // C structs and unions. 3872 // 3873 // GNU C also supports this behavior as part of its incomplete 3874 // enum types extension, while GNU C++ does not. 3875 // 3876 // Find the context where we'll be declaring the tag. 3877 // FIXME: We would like to maintain the current DeclContext as the 3878 // lexical context, 3879 while (SearchDC->isRecord()) 3880 SearchDC = SearchDC->getParent(); 3881 3882 // Find the scope where we'll be declaring the tag. 3883 while (S->isClassScope() || 3884 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 3885 ((S->getFlags() & Scope::DeclScope) == 0) || 3886 (S->getEntity() && 3887 ((DeclContext *)S->getEntity())->isTransparentContext())) 3888 S = S->getParent(); 3889 } 3890 3891CreateNewDecl: 3892 3893 // If there is an identifier, use the location of the identifier as the 3894 // location of the decl, otherwise use the location of the struct/union 3895 // keyword. 3896 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 3897 3898 // Otherwise, create a new declaration. If there is a previous 3899 // declaration of the same entity, the two will be linked via 3900 // PrevDecl. 3901 TagDecl *New; 3902 3903 if (Kind == TagDecl::TK_enum) { 3904 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3905 // enum X { A, B, C } D; D should chain to X. 3906 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 3907 cast_or_null<EnumDecl>(PrevDecl)); 3908 // If this is an undefined enum, warn. 3909 if (TK != TK_Definition && !Invalid) { 3910 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 3911 : diag::ext_forward_ref_enum; 3912 Diag(Loc, DK); 3913 } 3914 } else { 3915 // struct/union/class 3916 3917 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3918 // struct X { int A; } D; D should chain to X. 3919 if (getLangOptions().CPlusPlus) 3920 // FIXME: Look for a way to use RecordDecl for simple structs. 3921 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 3922 cast_or_null<CXXRecordDecl>(PrevDecl)); 3923 else 3924 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 3925 cast_or_null<RecordDecl>(PrevDecl)); 3926 } 3927 3928 if (Kind != TagDecl::TK_enum) { 3929 // Handle #pragma pack: if the #pragma pack stack has non-default 3930 // alignment, make up a packed attribute for this decl. These 3931 // attributes are checked when the ASTContext lays out the 3932 // structure. 3933 // 3934 // It is important for implementing the correct semantics that this 3935 // happen here (in act on tag decl). The #pragma pack stack is 3936 // maintained as a result of parser callbacks which can occur at 3937 // many points during the parsing of a struct declaration (because 3938 // the #pragma tokens are effectively skipped over during the 3939 // parsing of the struct). 3940 if (unsigned Alignment = getPragmaPackAlignment()) 3941 New->addAttr(::new (Context) PackedAttr(Alignment * 8)); 3942 } 3943 3944 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 3945 // C++ [dcl.typedef]p3: 3946 // [...] Similarly, in a given scope, a class or enumeration 3947 // shall not be declared with the same name as a typedef-name 3948 // that is declared in that scope and refers to a type other 3949 // than the class or enumeration itself. 3950 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 3951 TypedefDecl *PrevTypedef = 0; 3952 if (Lookup.getKind() == LookupResult::Found) 3953 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 3954 3955 if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && 3956 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 3957 Context.getCanonicalType(Context.getTypeDeclType(New))) { 3958 Diag(Loc, diag::err_tag_definition_of_typedef) 3959 << Context.getTypeDeclType(New) 3960 << PrevTypedef->getUnderlyingType(); 3961 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 3962 Invalid = true; 3963 } 3964 } 3965 3966 if (Invalid) 3967 New->setInvalidDecl(); 3968 3969 if (Attr) 3970 ProcessDeclAttributeList(S, New, Attr); 3971 3972 // If we're declaring or defining a tag in function prototype scope 3973 // in C, note that this type can only be used within the function. 3974 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 3975 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 3976 3977 // Set the lexical context. If the tag has a C++ scope specifier, the 3978 // lexical context will be different from the semantic context. 3979 New->setLexicalDeclContext(CurContext); 3980 3981 // Set the access specifier. 3982 if (!Invalid) 3983 SetMemberAccessSpecifier(New, PrevDecl, AS); 3984 3985 if (TK == TK_Definition) 3986 New->startDefinition(); 3987 3988 // If this has an identifier, add it to the scope stack. 3989 if (Name) { 3990 S = getNonFieldDeclScope(S); 3991 PushOnScopeChains(New, S); 3992 } else { 3993 CurContext->addDecl(New); 3994 } 3995 3996 // If this is the C FILE type, notify the AST context. 3997 if (IdentifierInfo *II = New->getIdentifier()) 3998 if (!New->isInvalidDecl() && 3999 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 4000 II->isStr("FILE")) 4001 Context.setFILEDecl(New); 4002 4003 OwnedDecl = true; 4004 return DeclPtrTy::make(New); 4005} 4006 4007void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 4008 AdjustDeclIfTemplate(TagD); 4009 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 4010 4011 // Enter the tag context. 4012 PushDeclContext(S, Tag); 4013 4014 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 4015 FieldCollector->StartClass(); 4016 4017 if (Record->getIdentifier()) { 4018 // C++ [class]p2: 4019 // [...] The class-name is also inserted into the scope of the 4020 // class itself; this is known as the injected-class-name. For 4021 // purposes of access checking, the injected-class-name is treated 4022 // as if it were a public member name. 4023 CXXRecordDecl *InjectedClassName 4024 = CXXRecordDecl::Create(Context, Record->getTagKind(), 4025 CurContext, Record->getLocation(), 4026 Record->getIdentifier(), 4027 Record->getTagKeywordLoc(), 4028 Record); 4029 InjectedClassName->setImplicit(); 4030 InjectedClassName->setAccess(AS_public); 4031 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 4032 InjectedClassName->setDescribedClassTemplate(Template); 4033 PushOnScopeChains(InjectedClassName, S); 4034 assert(InjectedClassName->isInjectedClassName() && 4035 "Broken injected-class-name"); 4036 } 4037 } 4038} 4039 4040void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 4041 SourceLocation RBraceLoc) { 4042 AdjustDeclIfTemplate(TagD); 4043 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 4044 Tag->setRBraceLoc(RBraceLoc); 4045 4046 if (isa<CXXRecordDecl>(Tag)) 4047 FieldCollector->FinishClass(); 4048 4049 // Exit this scope of this tag's definition. 4050 PopDeclContext(); 4051 4052 // Notify the consumer that we've defined a tag. 4053 Consumer.HandleTagDeclDefinition(Tag); 4054} 4055 4056// Note that FieldName may be null for anonymous bitfields. 4057bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 4058 QualType FieldTy, const Expr *BitWidth) { 4059 4060 // C99 6.7.2.1p4 - verify the field type. 4061 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 4062 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 4063 // Handle incomplete types with specific error. 4064 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 4065 return true; 4066 if (FieldName) 4067 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 4068 << FieldName << FieldTy << BitWidth->getSourceRange(); 4069 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 4070 << FieldTy << BitWidth->getSourceRange(); 4071 } 4072 4073 // If the bit-width is type- or value-dependent, don't try to check 4074 // it now. 4075 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 4076 return false; 4077 4078 llvm::APSInt Value; 4079 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 4080 return true; 4081 4082 // Zero-width bitfield is ok for anonymous field. 4083 if (Value == 0 && FieldName) 4084 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 4085 4086 if (Value.isSigned() && Value.isNegative()) { 4087 if (FieldName) 4088 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 4089 << FieldName << Value.toString(10); 4090 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 4091 << Value.toString(10); 4092 } 4093 4094 if (!FieldTy->isDependentType()) { 4095 uint64_t TypeSize = Context.getTypeSize(FieldTy); 4096 if (Value.getZExtValue() > TypeSize) { 4097 if (FieldName) 4098 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 4099 << FieldName << (unsigned)TypeSize; 4100 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 4101 << (unsigned)TypeSize; 4102 } 4103 } 4104 4105 return false; 4106} 4107 4108/// ActOnField - Each field of a struct/union/class is passed into this in order 4109/// to create a FieldDecl object for it. 4110Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 4111 SourceLocation DeclStart, 4112 Declarator &D, ExprTy *BitfieldWidth) { 4113 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 4114 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 4115 AS_public); 4116 return DeclPtrTy::make(Res); 4117} 4118 4119/// HandleField - Analyze a field of a C struct or a C++ data member. 4120/// 4121FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 4122 SourceLocation DeclStart, 4123 Declarator &D, Expr *BitWidth, 4124 AccessSpecifier AS) { 4125 IdentifierInfo *II = D.getIdentifier(); 4126 SourceLocation Loc = DeclStart; 4127 if (II) Loc = D.getIdentifierLoc(); 4128 4129 QualType T = GetTypeForDeclarator(D, S); 4130 if (getLangOptions().CPlusPlus) 4131 CheckExtraCXXDefaultArguments(D); 4132 4133 DiagnoseFunctionSpecifiers(D); 4134 4135 if (D.getDeclSpec().isThreadSpecified()) 4136 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4137 4138 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 4139 4140 if (PrevDecl && PrevDecl->isTemplateParameter()) { 4141 // Maybe we will complain about the shadowed template parameter. 4142 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4143 // Just pretend that we didn't see the previous declaration. 4144 PrevDecl = 0; 4145 } 4146 4147 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 4148 PrevDecl = 0; 4149 4150 bool Mutable 4151 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 4152 SourceLocation TSSL = D.getSourceRange().getBegin(); 4153 FieldDecl *NewFD 4154 = CheckFieldDecl(II, T, Record, Loc, Mutable, BitWidth, TSSL, 4155 AS, PrevDecl, &D); 4156 if (NewFD->isInvalidDecl() && PrevDecl) { 4157 // Don't introduce NewFD into scope; there's already something 4158 // with the same name in the same scope. 4159 } else if (II) { 4160 PushOnScopeChains(NewFD, S); 4161 } else 4162 Record->addDecl(NewFD); 4163 4164 return NewFD; 4165} 4166 4167/// \brief Build a new FieldDecl and check its well-formedness. 4168/// 4169/// This routine builds a new FieldDecl given the fields name, type, 4170/// record, etc. \p PrevDecl should refer to any previous declaration 4171/// with the same name and in the same scope as the field to be 4172/// created. 4173/// 4174/// \returns a new FieldDecl. 4175/// 4176/// \todo The Declarator argument is a hack. It will be removed once 4177FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 4178 RecordDecl *Record, SourceLocation Loc, 4179 bool Mutable, Expr *BitWidth, 4180 SourceLocation TSSL, 4181 AccessSpecifier AS, NamedDecl *PrevDecl, 4182 Declarator *D) { 4183 IdentifierInfo *II = Name.getAsIdentifierInfo(); 4184 bool InvalidDecl = false; 4185 if (D) InvalidDecl = D->isInvalidType(); 4186 4187 // If we receive a broken type, recover by assuming 'int' and 4188 // marking this declaration as invalid. 4189 if (T.isNull()) { 4190 InvalidDecl = true; 4191 T = Context.IntTy; 4192 } 4193 4194 // C99 6.7.2.1p8: A member of a structure or union may have any type other 4195 // than a variably modified type. 4196 if (T->isVariablyModifiedType()) { 4197 bool SizeIsNegative; 4198 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 4199 SizeIsNegative); 4200 if (!FixedTy.isNull()) { 4201 Diag(Loc, diag::warn_illegal_constant_array_size); 4202 T = FixedTy; 4203 } else { 4204 if (SizeIsNegative) 4205 Diag(Loc, diag::err_typecheck_negative_array_size); 4206 else 4207 Diag(Loc, diag::err_typecheck_field_variable_size); 4208 InvalidDecl = true; 4209 } 4210 } 4211 4212 // Fields can not have abstract class types 4213 if (RequireNonAbstractType(Loc, T, diag::err_abstract_type_in_decl, 4214 AbstractFieldType)) 4215 InvalidDecl = true; 4216 4217 // If this is declared as a bit-field, check the bit-field. 4218 if (BitWidth && VerifyBitField(Loc, II, T, BitWidth)) { 4219 InvalidDecl = true; 4220 DeleteExpr(BitWidth); 4221 BitWidth = 0; 4222 } 4223 4224 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, BitWidth, 4225 Mutable, TSSL); 4226 if (InvalidDecl) 4227 NewFD->setInvalidDecl(); 4228 4229 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 4230 Diag(Loc, diag::err_duplicate_member) << II; 4231 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4232 NewFD->setInvalidDecl(); 4233 } 4234 4235 if (getLangOptions().CPlusPlus) { 4236 QualType EltTy = T; 4237 while (const ArrayType *AT = Context.getAsArrayType(EltTy)) 4238 EltTy = AT->getElementType(); 4239 4240 if (const RecordType *RT = EltTy->getAsRecordType()) { 4241 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 4242 4243 if (!RDecl->hasTrivialConstructor()) 4244 cast<CXXRecordDecl>(Record)->setHasTrivialConstructor(false); 4245 if (!RDecl->hasTrivialCopyConstructor()) 4246 cast<CXXRecordDecl>(Record)->setHasTrivialCopyConstructor(false); 4247 if (!RDecl->hasTrivialCopyAssignment()) 4248 cast<CXXRecordDecl>(Record)->setHasTrivialCopyAssignment(false); 4249 if (!RDecl->hasTrivialDestructor()) 4250 cast<CXXRecordDecl>(Record)->setHasTrivialDestructor(false); 4251 4252 // C++ 9.5p1: An object of a class with a non-trivial 4253 // constructor, a non-trivial copy constructor, a non-trivial 4254 // destructor, or a non-trivial copy assignment operator 4255 // cannot be a member of a union, nor can an array of such 4256 // objects. 4257 // TODO: C++0x alters this restriction significantly. 4258 if (Record->isUnion()) { 4259 // We check for copy constructors before constructors 4260 // because otherwise we'll never get complaints about 4261 // copy constructors. 4262 4263 const CXXSpecialMember invalid = (CXXSpecialMember) -1; 4264 4265 CXXSpecialMember member; 4266 if (!RDecl->hasTrivialCopyConstructor()) 4267 member = CXXCopyConstructor; 4268 else if (!RDecl->hasTrivialConstructor()) 4269 member = CXXDefaultConstructor; 4270 else if (!RDecl->hasTrivialCopyAssignment()) 4271 member = CXXCopyAssignment; 4272 else if (!RDecl->hasTrivialDestructor()) 4273 member = CXXDestructor; 4274 else 4275 member = invalid; 4276 4277 if (member != invalid) { 4278 Diag(Loc, diag::err_illegal_union_member) << Name << member; 4279 DiagnoseNontrivial(RT, member); 4280 NewFD->setInvalidDecl(); 4281 } 4282 } 4283 } 4284 } 4285 4286 if (getLangOptions().CPlusPlus && !T->isPODType()) 4287 cast<CXXRecordDecl>(Record)->setPOD(false); 4288 4289 // FIXME: We need to pass in the attributes given an AST 4290 // representation, not a parser representation. 4291 if (D) 4292 // FIXME: What to pass instead of TUScope? 4293 ProcessDeclAttributes(TUScope, NewFD, *D); 4294 4295 if (T.isObjCGCWeak()) 4296 Diag(Loc, diag::warn_attribute_weak_on_field); 4297 4298 NewFD->setAccess(AS); 4299 4300 // C++ [dcl.init.aggr]p1: 4301 // An aggregate is an array or a class (clause 9) with [...] no 4302 // private or protected non-static data members (clause 11). 4303 // A POD must be an aggregate. 4304 if (getLangOptions().CPlusPlus && 4305 (AS == AS_private || AS == AS_protected)) { 4306 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 4307 CXXRecord->setAggregate(false); 4308 CXXRecord->setPOD(false); 4309 } 4310 4311 return NewFD; 4312} 4313 4314/// DiagnoseNontrivial - Given that a class has a non-trivial 4315/// special member, figure out why. 4316void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 4317 QualType QT(T, 0U); 4318 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 4319 4320 // Check whether the member was user-declared. 4321 switch (member) { 4322 case CXXDefaultConstructor: 4323 if (RD->hasUserDeclaredConstructor()) { 4324 typedef CXXRecordDecl::ctor_iterator ctor_iter; 4325 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce; ++ci) 4326 if (!ci->isImplicitlyDefined(Context)) { 4327 SourceLocation CtorLoc = ci->getLocation(); 4328 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 4329 return; 4330 } 4331 4332 assert(0 && "found no user-declared constructors"); 4333 return; 4334 } 4335 break; 4336 4337 case CXXCopyConstructor: 4338 if (RD->hasUserDeclaredCopyConstructor()) { 4339 SourceLocation CtorLoc = 4340 RD->getCopyConstructor(Context, 0)->getLocation(); 4341 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 4342 return; 4343 } 4344 break; 4345 4346 case CXXCopyAssignment: 4347 if (RD->hasUserDeclaredCopyAssignment()) { 4348 // FIXME: this should use the location of the copy 4349 // assignment, not the type. 4350 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 4351 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 4352 return; 4353 } 4354 break; 4355 4356 case CXXDestructor: 4357 if (RD->hasUserDeclaredDestructor()) { 4358 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation(); 4359 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 4360 return; 4361 } 4362 break; 4363 } 4364 4365 typedef CXXRecordDecl::base_class_iterator base_iter; 4366 4367 // Virtual bases and members inhibit trivial copying/construction, 4368 // but not trivial destruction. 4369 if (member != CXXDestructor) { 4370 // Check for virtual bases. vbases includes indirect virtual bases, 4371 // so we just iterate through the direct bases. 4372 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 4373 if (bi->isVirtual()) { 4374 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 4375 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 4376 return; 4377 } 4378 4379 // Check for virtual methods. 4380 typedef CXXRecordDecl::method_iterator meth_iter; 4381 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 4382 ++mi) { 4383 if (mi->isVirtual()) { 4384 SourceLocation MLoc = mi->getSourceRange().getBegin(); 4385 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 4386 return; 4387 } 4388 } 4389 } 4390 4391 bool (CXXRecordDecl::*hasTrivial)() const; 4392 switch (member) { 4393 case CXXDefaultConstructor: 4394 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 4395 case CXXCopyConstructor: 4396 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 4397 case CXXCopyAssignment: 4398 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 4399 case CXXDestructor: 4400 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 4401 default: 4402 assert(0 && "unexpected special member"); return; 4403 } 4404 4405 // Check for nontrivial bases (and recurse). 4406 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 4407 const RecordType *BaseRT = bi->getType()->getAsRecordType(); 4408 assert(BaseRT); 4409 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 4410 if (!(BaseRecTy->*hasTrivial)()) { 4411 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 4412 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 4413 DiagnoseNontrivial(BaseRT, member); 4414 return; 4415 } 4416 } 4417 4418 // Check for nontrivial members (and recurse). 4419 typedef RecordDecl::field_iterator field_iter; 4420 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 4421 ++fi) { 4422 QualType EltTy = (*fi)->getType(); 4423 while (const ArrayType *AT = Context.getAsArrayType(EltTy)) 4424 EltTy = AT->getElementType(); 4425 4426 if (const RecordType *EltRT = EltTy->getAsRecordType()) { 4427 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 4428 4429 if (!(EltRD->*hasTrivial)()) { 4430 SourceLocation FLoc = (*fi)->getLocation(); 4431 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 4432 DiagnoseNontrivial(EltRT, member); 4433 return; 4434 } 4435 } 4436 } 4437 4438 assert(0 && "found no explanation for non-trivial member"); 4439} 4440 4441/// TranslateIvarVisibility - Translate visibility from a token ID to an 4442/// AST enum value. 4443static ObjCIvarDecl::AccessControl 4444TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 4445 switch (ivarVisibility) { 4446 default: assert(0 && "Unknown visitibility kind"); 4447 case tok::objc_private: return ObjCIvarDecl::Private; 4448 case tok::objc_public: return ObjCIvarDecl::Public; 4449 case tok::objc_protected: return ObjCIvarDecl::Protected; 4450 case tok::objc_package: return ObjCIvarDecl::Package; 4451 } 4452} 4453 4454/// ActOnIvar - Each ivar field of an objective-c class is passed into this 4455/// in order to create an IvarDecl object for it. 4456Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 4457 SourceLocation DeclStart, 4458 DeclPtrTy IntfDecl, 4459 Declarator &D, ExprTy *BitfieldWidth, 4460 tok::ObjCKeywordKind Visibility) { 4461 4462 IdentifierInfo *II = D.getIdentifier(); 4463 Expr *BitWidth = (Expr*)BitfieldWidth; 4464 SourceLocation Loc = DeclStart; 4465 if (II) Loc = D.getIdentifierLoc(); 4466 4467 // FIXME: Unnamed fields can be handled in various different ways, for 4468 // example, unnamed unions inject all members into the struct namespace! 4469 4470 QualType T = GetTypeForDeclarator(D, S); 4471 4472 if (BitWidth) { 4473 // 6.7.2.1p3, 6.7.2.1p4 4474 if (VerifyBitField(Loc, II, T, BitWidth)) { 4475 D.setInvalidType(); 4476 DeleteExpr(BitWidth); 4477 BitWidth = 0; 4478 } 4479 } else { 4480 // Not a bitfield. 4481 4482 // validate II. 4483 4484 } 4485 4486 // C99 6.7.2.1p8: A member of a structure or union may have any type other 4487 // than a variably modified type. 4488 if (T->isVariablyModifiedType()) { 4489 Diag(Loc, diag::err_typecheck_ivar_variable_size); 4490 D.setInvalidType(); 4491 } 4492 4493 // Get the visibility (access control) for this ivar. 4494 ObjCIvarDecl::AccessControl ac = 4495 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 4496 : ObjCIvarDecl::None; 4497 // Must set ivar's DeclContext to its enclosing interface. 4498 Decl *EnclosingDecl = IntfDecl.getAs<Decl>(); 4499 DeclContext *EnclosingContext; 4500 if (ObjCImplementationDecl *IMPDecl = 4501 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 4502 // Case of ivar declared in an implementation. Context is that of its class. 4503 ObjCInterfaceDecl* IDecl = IMPDecl->getClassInterface(); 4504 assert(IDecl && "No class- ActOnIvar"); 4505 EnclosingContext = cast_or_null<DeclContext>(IDecl); 4506 } 4507 else 4508 EnclosingContext = dyn_cast<DeclContext>(EnclosingDecl); 4509 assert(EnclosingContext && "null DeclContext for ivar - ActOnIvar"); 4510 4511 // Construct the decl. 4512 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 4513 EnclosingContext, Loc, II, T,ac, 4514 (Expr *)BitfieldWidth); 4515 4516 if (II) { 4517 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 4518 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 4519 && !isa<TagDecl>(PrevDecl)) { 4520 Diag(Loc, diag::err_duplicate_member) << II; 4521 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4522 NewID->setInvalidDecl(); 4523 } 4524 } 4525 4526 // Process attributes attached to the ivar. 4527 ProcessDeclAttributes(S, NewID, D); 4528 4529 if (D.isInvalidType()) 4530 NewID->setInvalidDecl(); 4531 4532 if (II) { 4533 // FIXME: When interfaces are DeclContexts, we'll need to add 4534 // these to the interface. 4535 S->AddDecl(DeclPtrTy::make(NewID)); 4536 IdResolver.AddDecl(NewID); 4537 } 4538 4539 return DeclPtrTy::make(NewID); 4540} 4541 4542void Sema::ActOnFields(Scope* S, 4543 SourceLocation RecLoc, DeclPtrTy RecDecl, 4544 DeclPtrTy *Fields, unsigned NumFields, 4545 SourceLocation LBrac, SourceLocation RBrac, 4546 AttributeList *Attr) { 4547 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 4548 assert(EnclosingDecl && "missing record or interface decl"); 4549 4550 // If the decl this is being inserted into is invalid, then it may be a 4551 // redeclaration or some other bogus case. Don't try to add fields to it. 4552 if (EnclosingDecl->isInvalidDecl()) { 4553 // FIXME: Deallocate fields? 4554 return; 4555 } 4556 4557 4558 // Verify that all the fields are okay. 4559 unsigned NumNamedMembers = 0; 4560 llvm::SmallVector<FieldDecl*, 32> RecFields; 4561 4562 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 4563 for (unsigned i = 0; i != NumFields; ++i) { 4564 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 4565 4566 // Get the type for the field. 4567 Type *FDTy = FD->getType().getTypePtr(); 4568 4569 if (!FD->isAnonymousStructOrUnion()) { 4570 // Remember all fields written by the user. 4571 RecFields.push_back(FD); 4572 } 4573 4574 // If the field is already invalid for some reason, don't emit more 4575 // diagnostics about it. 4576 if (FD->isInvalidDecl()) 4577 continue; 4578 4579 // C99 6.7.2.1p2: 4580 // A structure or union shall not contain a member with 4581 // incomplete or function type (hence, a structure shall not 4582 // contain an instance of itself, but may contain a pointer to 4583 // an instance of itself), except that the last member of a 4584 // structure with more than one named member may have incomplete 4585 // array type; such a structure (and any union containing, 4586 // possibly recursively, a member that is such a structure) 4587 // shall not be a member of a structure or an element of an 4588 // array. 4589 if (FDTy->isFunctionType()) { 4590 // Field declared as a function. 4591 Diag(FD->getLocation(), diag::err_field_declared_as_function) 4592 << FD->getDeclName(); 4593 FD->setInvalidDecl(); 4594 EnclosingDecl->setInvalidDecl(); 4595 continue; 4596 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 4597 Record && Record->isStruct()) { 4598 // Flexible array member. 4599 if (NumNamedMembers < 1) { 4600 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 4601 << FD->getDeclName(); 4602 FD->setInvalidDecl(); 4603 EnclosingDecl->setInvalidDecl(); 4604 continue; 4605 } 4606 // Okay, we have a legal flexible array member at the end of the struct. 4607 if (Record) 4608 Record->setHasFlexibleArrayMember(true); 4609 } else if (!FDTy->isDependentType() && 4610 RequireCompleteType(FD->getLocation(), FD->getType(), 4611 diag::err_field_incomplete)) { 4612 // Incomplete type 4613 FD->setInvalidDecl(); 4614 EnclosingDecl->setInvalidDecl(); 4615 continue; 4616 } else if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 4617 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 4618 // If this is a member of a union, then entire union becomes "flexible". 4619 if (Record && Record->isUnion()) { 4620 Record->setHasFlexibleArrayMember(true); 4621 } else { 4622 // If this is a struct/class and this is not the last element, reject 4623 // it. Note that GCC supports variable sized arrays in the middle of 4624 // structures. 4625 if (i != NumFields-1) 4626 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 4627 << FD->getDeclName() << FD->getType(); 4628 else { 4629 // We support flexible arrays at the end of structs in 4630 // other structs as an extension. 4631 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 4632 << FD->getDeclName(); 4633 if (Record) 4634 Record->setHasFlexibleArrayMember(true); 4635 } 4636 } 4637 } 4638 if (Record && FDTTy->getDecl()->hasObjectMember()) 4639 Record->setHasObjectMember(true); 4640 } else if (FDTy->isObjCInterfaceType()) { 4641 /// A field cannot be an Objective-c object 4642 Diag(FD->getLocation(), diag::err_statically_allocated_object); 4643 FD->setInvalidDecl(); 4644 EnclosingDecl->setInvalidDecl(); 4645 continue; 4646 } 4647 else if (getLangOptions().ObjC1 && 4648 getLangOptions().getGCMode() != LangOptions::NonGC && 4649 Record && 4650 (FD->getType()->isObjCObjectPointerType() || 4651 FD->getType().isObjCGCStrong())) 4652 Record->setHasObjectMember(true); 4653 // Keep track of the number of named members. 4654 if (FD->getIdentifier()) 4655 ++NumNamedMembers; 4656 } 4657 4658 // Okay, we successfully defined 'Record'. 4659 if (Record) { 4660 Record->completeDefinition(Context); 4661 } else { 4662 ObjCIvarDecl **ClsFields = 4663 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 4664 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 4665 ID->setIVarList(ClsFields, RecFields.size(), Context); 4666 ID->setLocEnd(RBrac); 4667 // Add ivar's to class's DeclContext. 4668 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 4669 ClsFields[i]->setLexicalDeclContext(ID); 4670 ID->addDecl(ClsFields[i]); 4671 } 4672 // Must enforce the rule that ivars in the base classes may not be 4673 // duplicates. 4674 if (ID->getSuperClass()) { 4675 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 4676 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 4677 ObjCIvarDecl* Ivar = (*IVI); 4678 4679 if (IdentifierInfo *II = Ivar->getIdentifier()) { 4680 ObjCIvarDecl* prevIvar = 4681 ID->getSuperClass()->lookupInstanceVariable(II); 4682 if (prevIvar) { 4683 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 4684 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 4685 } 4686 } 4687 } 4688 } 4689 } else if (ObjCImplementationDecl *IMPDecl = 4690 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 4691 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 4692 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 4693 // Ivar declared in @implementation never belongs to the implementation. 4694 // Only it is in implementation's lexical context. 4695 ClsFields[I]->setLexicalDeclContext(IMPDecl); 4696 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 4697 } 4698 } 4699 4700 if (Attr) 4701 ProcessDeclAttributeList(S, Record, Attr); 4702} 4703 4704EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 4705 EnumConstantDecl *LastEnumConst, 4706 SourceLocation IdLoc, 4707 IdentifierInfo *Id, 4708 ExprArg val) { 4709 Expr *Val = (Expr *)val.get(); 4710 4711 llvm::APSInt EnumVal(32); 4712 QualType EltTy; 4713 if (Val && !Val->isTypeDependent()) { 4714 // Make sure to promote the operand type to int. 4715 UsualUnaryConversions(Val); 4716 if (Val != val.get()) { 4717 val.release(); 4718 val = Val; 4719 } 4720 4721 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 4722 SourceLocation ExpLoc; 4723 if (!Val->isValueDependent() && 4724 VerifyIntegerConstantExpression(Val, &EnumVal)) { 4725 Val = 0; 4726 } else { 4727 EltTy = Val->getType(); 4728 } 4729 } 4730 4731 if (!Val) { 4732 if (LastEnumConst) { 4733 // Assign the last value + 1. 4734 EnumVal = LastEnumConst->getInitVal(); 4735 ++EnumVal; 4736 4737 // Check for overflow on increment. 4738 if (EnumVal < LastEnumConst->getInitVal()) 4739 Diag(IdLoc, diag::warn_enum_value_overflow); 4740 4741 EltTy = LastEnumConst->getType(); 4742 } else { 4743 // First value, set to zero. 4744 EltTy = Context.IntTy; 4745 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 4746 } 4747 } 4748 4749 val.release(); 4750 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 4751 Val, EnumVal); 4752} 4753 4754 4755Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 4756 DeclPtrTy lastEnumConst, 4757 SourceLocation IdLoc, 4758 IdentifierInfo *Id, 4759 SourceLocation EqualLoc, ExprTy *val) { 4760 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 4761 EnumConstantDecl *LastEnumConst = 4762 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 4763 Expr *Val = static_cast<Expr*>(val); 4764 4765 // The scope passed in may not be a decl scope. Zip up the scope tree until 4766 // we find one that is. 4767 S = getNonFieldDeclScope(S); 4768 4769 // Verify that there isn't already something declared with this name in this 4770 // scope. 4771 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 4772 if (PrevDecl && PrevDecl->isTemplateParameter()) { 4773 // Maybe we will complain about the shadowed template parameter. 4774 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 4775 // Just pretend that we didn't see the previous declaration. 4776 PrevDecl = 0; 4777 } 4778 4779 if (PrevDecl) { 4780 // When in C++, we may get a TagDecl with the same name; in this case the 4781 // enum constant will 'hide' the tag. 4782 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 4783 "Received TagDecl when not in C++!"); 4784 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 4785 if (isa<EnumConstantDecl>(PrevDecl)) 4786 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 4787 else 4788 Diag(IdLoc, diag::err_redefinition) << Id; 4789 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4790 if (Val) Val->Destroy(Context); 4791 return DeclPtrTy(); 4792 } 4793 } 4794 4795 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 4796 IdLoc, Id, Owned(Val)); 4797 4798 // Register this decl in the current scope stack. 4799 if (New) 4800 PushOnScopeChains(New, S); 4801 4802 return DeclPtrTy::make(New); 4803} 4804 4805void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 4806 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 4807 DeclPtrTy *Elements, unsigned NumElements) { 4808 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 4809 QualType EnumType = Context.getTypeDeclType(Enum); 4810 4811 // TODO: If the result value doesn't fit in an int, it must be a long or long 4812 // long value. ISO C does not support this, but GCC does as an extension, 4813 // emit a warning. 4814 unsigned IntWidth = Context.Target.getIntWidth(); 4815 4816 // Verify that all the values are okay, compute the size of the values, and 4817 // reverse the list. 4818 unsigned NumNegativeBits = 0; 4819 unsigned NumPositiveBits = 0; 4820 4821 // Keep track of whether all elements have type int. 4822 bool AllElementsInt = true; 4823 4824 for (unsigned i = 0; i != NumElements; ++i) { 4825 EnumConstantDecl *ECD = 4826 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 4827 if (!ECD) continue; // Already issued a diagnostic. 4828 4829 // If the enum value doesn't fit in an int, emit an extension warning. 4830 const llvm::APSInt &InitVal = ECD->getInitVal(); 4831 assert(InitVal.getBitWidth() >= IntWidth && 4832 "Should have promoted value to int"); 4833 if (InitVal.getBitWidth() > IntWidth) { 4834 llvm::APSInt V(InitVal); 4835 V.trunc(IntWidth); 4836 V.extend(InitVal.getBitWidth()); 4837 if (V != InitVal) 4838 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 4839 << InitVal.toString(10); 4840 } 4841 4842 // Keep track of the size of positive and negative values. 4843 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 4844 NumPositiveBits = std::max(NumPositiveBits, 4845 (unsigned)InitVal.getActiveBits()); 4846 else 4847 NumNegativeBits = std::max(NumNegativeBits, 4848 (unsigned)InitVal.getMinSignedBits()); 4849 4850 // Keep track of whether every enum element has type int (very commmon). 4851 if (AllElementsInt) 4852 AllElementsInt = ECD->getType() == Context.IntTy; 4853 } 4854 4855 // Figure out the type that should be used for this enum. 4856 // FIXME: Support attribute(packed) on enums and -fshort-enums. 4857 QualType BestType; 4858 unsigned BestWidth; 4859 4860 if (NumNegativeBits) { 4861 // If there is a negative value, figure out the smallest integer type (of 4862 // int/long/longlong) that fits. 4863 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 4864 BestType = Context.IntTy; 4865 BestWidth = IntWidth; 4866 } else { 4867 BestWidth = Context.Target.getLongWidth(); 4868 4869 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 4870 BestType = Context.LongTy; 4871 else { 4872 BestWidth = Context.Target.getLongLongWidth(); 4873 4874 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 4875 Diag(Enum->getLocation(), diag::warn_enum_too_large); 4876 BestType = Context.LongLongTy; 4877 } 4878 } 4879 } else { 4880 // If there is no negative value, figure out which of uint, ulong, ulonglong 4881 // fits. 4882 if (NumPositiveBits <= IntWidth) { 4883 BestType = Context.UnsignedIntTy; 4884 BestWidth = IntWidth; 4885 } else if (NumPositiveBits <= 4886 (BestWidth = Context.Target.getLongWidth())) { 4887 BestType = Context.UnsignedLongTy; 4888 } else { 4889 BestWidth = Context.Target.getLongLongWidth(); 4890 assert(NumPositiveBits <= BestWidth && 4891 "How could an initializer get larger than ULL?"); 4892 BestType = Context.UnsignedLongLongTy; 4893 } 4894 } 4895 4896 // Loop over all of the enumerator constants, changing their types to match 4897 // the type of the enum if needed. 4898 for (unsigned i = 0; i != NumElements; ++i) { 4899 EnumConstantDecl *ECD = 4900 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 4901 if (!ECD) continue; // Already issued a diagnostic. 4902 4903 // Standard C says the enumerators have int type, but we allow, as an 4904 // extension, the enumerators to be larger than int size. If each 4905 // enumerator value fits in an int, type it as an int, otherwise type it the 4906 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 4907 // that X has type 'int', not 'unsigned'. 4908 if (ECD->getType() == Context.IntTy) { 4909 // Make sure the init value is signed. 4910 llvm::APSInt IV = ECD->getInitVal(); 4911 IV.setIsSigned(true); 4912 ECD->setInitVal(IV); 4913 4914 if (getLangOptions().CPlusPlus) 4915 // C++ [dcl.enum]p4: Following the closing brace of an 4916 // enum-specifier, each enumerator has the type of its 4917 // enumeration. 4918 ECD->setType(EnumType); 4919 continue; // Already int type. 4920 } 4921 4922 // Determine whether the value fits into an int. 4923 llvm::APSInt InitVal = ECD->getInitVal(); 4924 bool FitsInInt; 4925 if (InitVal.isUnsigned() || !InitVal.isNegative()) 4926 FitsInInt = InitVal.getActiveBits() < IntWidth; 4927 else 4928 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 4929 4930 // If it fits into an integer type, force it. Otherwise force it to match 4931 // the enum decl type. 4932 QualType NewTy; 4933 unsigned NewWidth; 4934 bool NewSign; 4935 if (FitsInInt) { 4936 NewTy = Context.IntTy; 4937 NewWidth = IntWidth; 4938 NewSign = true; 4939 } else if (ECD->getType() == BestType) { 4940 // Already the right type! 4941 if (getLangOptions().CPlusPlus) 4942 // C++ [dcl.enum]p4: Following the closing brace of an 4943 // enum-specifier, each enumerator has the type of its 4944 // enumeration. 4945 ECD->setType(EnumType); 4946 continue; 4947 } else { 4948 NewTy = BestType; 4949 NewWidth = BestWidth; 4950 NewSign = BestType->isSignedIntegerType(); 4951 } 4952 4953 // Adjust the APSInt value. 4954 InitVal.extOrTrunc(NewWidth); 4955 InitVal.setIsSigned(NewSign); 4956 ECD->setInitVal(InitVal); 4957 4958 // Adjust the Expr initializer and type. 4959 if (ECD->getInitExpr()) 4960 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), 4961 /*isLvalue=*/false)); 4962 if (getLangOptions().CPlusPlus) 4963 // C++ [dcl.enum]p4: Following the closing brace of an 4964 // enum-specifier, each enumerator has the type of its 4965 // enumeration. 4966 ECD->setType(EnumType); 4967 else 4968 ECD->setType(NewTy); 4969 } 4970 4971 Enum->completeDefinition(Context, BestType); 4972} 4973 4974Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 4975 ExprArg expr) { 4976 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 4977 4978 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 4979 Loc, AsmString); 4980 CurContext->addDecl(New); 4981 return DeclPtrTy::make(New); 4982} 4983 4984void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 4985 SourceLocation PragmaLoc, 4986 SourceLocation NameLoc) { 4987 Decl *PrevDecl = LookupName(TUScope, Name, LookupOrdinaryName); 4988 4989 // FIXME: This implementation is an ugly hack! 4990 if (PrevDecl) { 4991 PrevDecl->addAttr(::new (Context) WeakAttr()); 4992 return; 4993 } 4994 Diag(PragmaLoc, diag::err_unsupported_pragma_weak); 4995 return; 4996} 4997 4998void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 4999 IdentifierInfo* AliasName, 5000 SourceLocation PragmaLoc, 5001 SourceLocation NameLoc, 5002 SourceLocation AliasNameLoc) { 5003 Decl *PrevDecl = LookupName(TUScope, Name, LookupOrdinaryName); 5004 5005 // FIXME: This implementation is an ugly hack! 5006 if (PrevDecl) { 5007 PrevDecl->addAttr(::new (Context) AliasAttr(AliasName->getName())); 5008 PrevDecl->addAttr(::new (Context) WeakAttr()); 5009 return; 5010 } 5011 Diag(PragmaLoc, diag::err_unsupported_pragma_weak); 5012 return; 5013} 5014