SemaDecl.cpp revision 10e975c9a31461b7b5c32725d749a7c6d9b88efa
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/SmallSet.h" 32#include "llvm/ADT/STLExtras.h" 33#include <algorithm> 34#include <functional> 35#include <queue> 36using namespace clang; 37 38/// getDeclName - Return a pretty name for the specified decl if possible, or 39/// an empty string if not. This is used for pretty crash reporting. 40std::string Sema::getDeclName(DeclPtrTy d) { 41 Decl *D = d.getAs<Decl>(); 42 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 43 return DN->getQualifiedNameAsString(); 44 return ""; 45} 46 47Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) { 48 return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>())); 49} 50 51/// \brief If the identifier refers to a type name within this scope, 52/// return the declaration of that type. 53/// 54/// This routine performs ordinary name lookup of the identifier II 55/// within the given scope, with optional C++ scope specifier SS, to 56/// determine whether the name refers to a type. If so, returns an 57/// opaque pointer (actually a QualType) corresponding to that 58/// type. Otherwise, returns NULL. 59/// 60/// If name lookup results in an ambiguity, this routine will complain 61/// and then return NULL. 62Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 63 Scope *S, const CXXScopeSpec *SS) { 64 // C++ [temp.res]p3: 65 // A qualified-id that refers to a type and in which the 66 // nested-name-specifier depends on a template-parameter (14.6.2) 67 // shall be prefixed by the keyword typename to indicate that the 68 // qualified-id denotes a type, forming an 69 // elaborated-type-specifier (7.1.5.3). 70 // 71 // We therefore do not perform any name lookup if the result would 72 // refer to a member of an unknown specialization. 73 if (SS && isUnknownSpecialization(*SS)) 74 return 0; 75 76 LookupResult Result 77 = LookupParsedName(S, SS, &II, LookupOrdinaryName, false, false); 78 79 NamedDecl *IIDecl = 0; 80 switch (Result.getKind()) { 81 case LookupResult::NotFound: 82 case LookupResult::FoundOverloaded: 83 return 0; 84 85 case LookupResult::AmbiguousBaseSubobjectTypes: 86 case LookupResult::AmbiguousBaseSubobjects: 87 case LookupResult::AmbiguousReference: { 88 // Look to see if we have a type anywhere in the list of results. 89 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 90 Res != ResEnd; ++Res) { 91 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 92 if (!IIDecl || 93 (*Res)->getLocation().getRawEncoding() < 94 IIDecl->getLocation().getRawEncoding()) 95 IIDecl = *Res; 96 } 97 } 98 99 if (!IIDecl) { 100 // None of the entities we found is a type, so there is no way 101 // to even assume that the result is a type. In this case, don't 102 // complain about the ambiguity. The parser will either try to 103 // perform this lookup again (e.g., as an object name), which 104 // will produce the ambiguity, or will complain that it expected 105 // a type name. 106 Result.Destroy(); 107 return 0; 108 } 109 110 // We found a type within the ambiguous lookup; diagnose the 111 // ambiguity and then return that type. This might be the right 112 // answer, or it might not be, but it suppresses any attempt to 113 // perform the name lookup again. 114 DiagnoseAmbiguousLookup(Result, DeclarationName(&II), NameLoc); 115 break; 116 } 117 118 case LookupResult::Found: 119 IIDecl = Result.getAsDecl(); 120 break; 121 } 122 123 if (IIDecl) { 124 QualType T; 125 126 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 127 // Check whether we can use this type 128 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 129 130 if (getLangOptions().CPlusPlus) { 131 // C++ [temp.local]p2: 132 // Within the scope of a class template specialization or 133 // partial specialization, when the injected-class-name is 134 // not followed by a <, it is equivalent to the 135 // injected-class-name followed by the template-argument s 136 // of the class template specialization or partial 137 // specialization enclosed in <>. 138 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) 139 if (RD->isInjectedClassName()) 140 if (ClassTemplateDecl *Template = RD->getDescribedClassTemplate()) 141 T = Template->getInjectedClassNameType(Context); 142 } 143 144 if (T.isNull()) 145 T = Context.getTypeDeclType(TD); 146 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 147 // Check whether we can use this interface. 148 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 149 150 T = Context.getObjCInterfaceType(IDecl); 151 } else 152 return 0; 153 154 if (SS) 155 T = getQualifiedNameType(*SS, T); 156 157 return T.getAsOpaquePtr(); 158 } 159 160 return 0; 161} 162 163/// isTagName() - This method is called *for error recovery purposes only* 164/// to determine if the specified name is a valid tag name ("struct foo"). If 165/// so, this returns the TST for the tag corresponding to it (TST_enum, 166/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 167/// where the user forgot to specify the tag. 168DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 169 // Do a tag name lookup in this scope. 170 LookupResult R = LookupName(S, &II, LookupTagName, false, false); 171 if (R.getKind() == LookupResult::Found) 172 if (const TagDecl *TD = dyn_cast<TagDecl>(R.getAsDecl())) { 173 switch (TD->getTagKind()) { 174 case TagDecl::TK_struct: return DeclSpec::TST_struct; 175 case TagDecl::TK_union: return DeclSpec::TST_union; 176 case TagDecl::TK_class: return DeclSpec::TST_class; 177 case TagDecl::TK_enum: return DeclSpec::TST_enum; 178 } 179 } 180 181 return DeclSpec::TST_unspecified; 182} 183 184 185 186DeclContext *Sema::getContainingDC(DeclContext *DC) { 187 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) { 188 // A C++ out-of-line method will return to the file declaration context. 189 if (MD->isOutOfLine()) 190 return MD->getLexicalDeclContext(); 191 192 // A C++ inline method is parsed *after* the topmost class it was declared 193 // in is fully parsed (it's "complete"). 194 // The parsing of a C++ inline method happens at the declaration context of 195 // the topmost (non-nested) class it is lexically declared in. 196 assert(isa<CXXRecordDecl>(MD->getParent()) && "C++ method not in Record."); 197 DC = MD->getParent(); 198 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 199 DC = RD; 200 201 // Return the declaration context of the topmost class the inline method is 202 // declared in. 203 return DC; 204 } 205 206 if (isa<ObjCMethodDecl>(DC)) 207 return Context.getTranslationUnitDecl(); 208 209 return DC->getLexicalParent(); 210} 211 212void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 213 assert(getContainingDC(DC) == CurContext && 214 "The next DeclContext should be lexically contained in the current one."); 215 CurContext = DC; 216 S->setEntity(DC); 217} 218 219void Sema::PopDeclContext() { 220 assert(CurContext && "DeclContext imbalance!"); 221 222 CurContext = getContainingDC(CurContext); 223} 224 225/// EnterDeclaratorContext - Used when we must lookup names in the context 226/// of a declarator's nested name specifier. 227void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 228 assert(PreDeclaratorDC == 0 && "Previous declarator context not popped?"); 229 PreDeclaratorDC = static_cast<DeclContext*>(S->getEntity()); 230 CurContext = DC; 231 assert(CurContext && "No context?"); 232 S->setEntity(CurContext); 233} 234 235void Sema::ExitDeclaratorContext(Scope *S) { 236 S->setEntity(PreDeclaratorDC); 237 PreDeclaratorDC = 0; 238 239 // Reset CurContext to the nearest enclosing context. 240 while (!S->getEntity() && S->getParent()) 241 S = S->getParent(); 242 CurContext = static_cast<DeclContext*>(S->getEntity()); 243 assert(CurContext && "No context?"); 244} 245 246/// \brief Determine whether we allow overloading of the function 247/// PrevDecl with another declaration. 248/// 249/// This routine determines whether overloading is possible, not 250/// whether some new function is actually an overload. It will return 251/// true in C++ (where we can always provide overloads) or, as an 252/// extension, in C when the previous function is already an 253/// overloaded function declaration or has the "overloadable" 254/// attribute. 255static bool AllowOverloadingOfFunction(Decl *PrevDecl, ASTContext &Context) { 256 if (Context.getLangOptions().CPlusPlus) 257 return true; 258 259 if (isa<OverloadedFunctionDecl>(PrevDecl)) 260 return true; 261 262 return PrevDecl->getAttr<OverloadableAttr>() != 0; 263} 264 265/// Add this decl to the scope shadowed decl chains. 266void Sema::PushOnScopeChains(NamedDecl *D, Scope *S) { 267 // Move up the scope chain until we find the nearest enclosing 268 // non-transparent context. The declaration will be introduced into this 269 // scope. 270 while (S->getEntity() && 271 ((DeclContext *)S->getEntity())->isTransparentContext()) 272 S = S->getParent(); 273 274 S->AddDecl(DeclPtrTy::make(D)); 275 276 // Add scoped declarations into their context, so that they can be 277 // found later. Declarations without a context won't be inserted 278 // into any context. 279 CurContext->addDecl(D); 280 281 // C++ [basic.scope]p4: 282 // -- exactly one declaration shall declare a class name or 283 // enumeration name that is not a typedef name and the other 284 // declarations shall all refer to the same object or 285 // enumerator, or all refer to functions and function templates; 286 // in this case the class name or enumeration name is hidden. 287 if (TagDecl *TD = dyn_cast<TagDecl>(D)) { 288 // We are pushing the name of a tag (enum or class). 289 if (CurContext->getLookupContext() 290 == TD->getDeclContext()->getLookupContext()) { 291 // We're pushing the tag into the current context, which might 292 // require some reshuffling in the identifier resolver. 293 IdentifierResolver::iterator 294 I = IdResolver.begin(TD->getDeclName()), 295 IEnd = IdResolver.end(); 296 if (I != IEnd && isDeclInScope(*I, CurContext, S)) { 297 NamedDecl *PrevDecl = *I; 298 for (; I != IEnd && isDeclInScope(*I, CurContext, S); 299 PrevDecl = *I, ++I) { 300 if (TD->declarationReplaces(*I)) { 301 // This is a redeclaration. Remove it from the chain and 302 // break out, so that we'll add in the shadowed 303 // declaration. 304 S->RemoveDecl(DeclPtrTy::make(*I)); 305 if (PrevDecl == *I) { 306 IdResolver.RemoveDecl(*I); 307 IdResolver.AddDecl(TD); 308 return; 309 } else { 310 IdResolver.RemoveDecl(*I); 311 break; 312 } 313 } 314 } 315 316 // There is already a declaration with the same name in the same 317 // scope, which is not a tag declaration. It must be found 318 // before we find the new declaration, so insert the new 319 // declaration at the end of the chain. 320 IdResolver.AddShadowedDecl(TD, PrevDecl); 321 322 return; 323 } 324 } 325 } else if ((isa<FunctionDecl>(D) && 326 AllowOverloadingOfFunction(D, Context)) || 327 isa<FunctionTemplateDecl>(D)) { 328 // We are pushing the name of a function or function template, 329 // which might be an overloaded name. 330 IdentifierResolver::iterator Redecl 331 = std::find_if(IdResolver.begin(D->getDeclName()), 332 IdResolver.end(), 333 std::bind1st(std::mem_fun(&NamedDecl::declarationReplaces), 334 D)); 335 if (Redecl != IdResolver.end() && 336 S->isDeclScope(DeclPtrTy::make(*Redecl))) { 337 // There is already a declaration of a function on our 338 // IdResolver chain. Replace it with this declaration. 339 S->RemoveDecl(DeclPtrTy::make(*Redecl)); 340 IdResolver.RemoveDecl(*Redecl); 341 } 342 } else if (isa<ObjCInterfaceDecl>(D)) { 343 // We're pushing an Objective-C interface into the current 344 // context. If there is already an alias declaration, remove it first. 345 for (IdentifierResolver::iterator 346 I = IdResolver.begin(D->getDeclName()), IEnd = IdResolver.end(); 347 I != IEnd; ++I) { 348 if (isa<ObjCCompatibleAliasDecl>(*I)) { 349 S->RemoveDecl(DeclPtrTy::make(*I)); 350 IdResolver.RemoveDecl(*I); 351 break; 352 } 353 } 354 } 355 356 IdResolver.AddDecl(D); 357} 358 359void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 360 if (S->decl_empty()) return; 361 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 362 "Scope shouldn't contain decls!"); 363 364 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 365 I != E; ++I) { 366 Decl *TmpD = (*I).getAs<Decl>(); 367 assert(TmpD && "This decl didn't get pushed??"); 368 369 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 370 NamedDecl *D = cast<NamedDecl>(TmpD); 371 372 if (!D->getDeclName()) continue; 373 374 // Remove this name from our lexical scope. 375 IdResolver.RemoveDecl(D); 376 } 377} 378 379/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 380/// return 0 if one not found. 381ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 382 // The third "scope" argument is 0 since we aren't enabling lazy built-in 383 // creation from this context. 384 NamedDecl *IDecl = LookupName(TUScope, Id, LookupOrdinaryName); 385 386 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 387} 388 389/// getNonFieldDeclScope - Retrieves the innermost scope, starting 390/// from S, where a non-field would be declared. This routine copes 391/// with the difference between C and C++ scoping rules in structs and 392/// unions. For example, the following code is well-formed in C but 393/// ill-formed in C++: 394/// @code 395/// struct S6 { 396/// enum { BAR } e; 397/// }; 398/// 399/// void test_S6() { 400/// struct S6 a; 401/// a.e = BAR; 402/// } 403/// @endcode 404/// For the declaration of BAR, this routine will return a different 405/// scope. The scope S will be the scope of the unnamed enumeration 406/// within S6. In C++, this routine will return the scope associated 407/// with S6, because the enumeration's scope is a transparent 408/// context but structures can contain non-field names. In C, this 409/// routine will return the translation unit scope, since the 410/// enumeration's scope is a transparent context and structures cannot 411/// contain non-field names. 412Scope *Sema::getNonFieldDeclScope(Scope *S) { 413 while (((S->getFlags() & Scope::DeclScope) == 0) || 414 (S->getEntity() && 415 ((DeclContext *)S->getEntity())->isTransparentContext()) || 416 (S->isClassScope() && !getLangOptions().CPlusPlus)) 417 S = S->getParent(); 418 return S; 419} 420 421void Sema::InitBuiltinVaListType() { 422 if (!Context.getBuiltinVaListType().isNull()) 423 return; 424 425 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 426 NamedDecl *VaDecl = LookupName(TUScope, VaIdent, LookupOrdinaryName); 427 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 428 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 429} 430 431/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 432/// file scope. lazily create a decl for it. ForRedeclaration is true 433/// if we're creating this built-in in anticipation of redeclaring the 434/// built-in. 435NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 436 Scope *S, bool ForRedeclaration, 437 SourceLocation Loc) { 438 Builtin::ID BID = (Builtin::ID)bid; 439 440 if (Context.BuiltinInfo.hasVAListUse(BID)) 441 InitBuiltinVaListType(); 442 443 ASTContext::GetBuiltinTypeError Error; 444 QualType R = Context.GetBuiltinType(BID, Error); 445 switch (Error) { 446 case ASTContext::GE_None: 447 // Okay 448 break; 449 450 case ASTContext::GE_Missing_FILE: 451 if (ForRedeclaration) 452 Diag(Loc, diag::err_implicit_decl_requires_stdio) 453 << Context.BuiltinInfo.GetName(BID); 454 return 0; 455 } 456 457 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 458 Diag(Loc, diag::ext_implicit_lib_function_decl) 459 << Context.BuiltinInfo.GetName(BID) 460 << R; 461 if (Context.BuiltinInfo.getHeaderName(BID) && 462 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 463 != Diagnostic::Ignored) 464 Diag(Loc, diag::note_please_include_header) 465 << Context.BuiltinInfo.getHeaderName(BID) 466 << Context.BuiltinInfo.GetName(BID); 467 } 468 469 FunctionDecl *New = FunctionDecl::Create(Context, 470 Context.getTranslationUnitDecl(), 471 Loc, II, R, 472 FunctionDecl::Extern, false, 473 /*hasPrototype=*/true); 474 New->setImplicit(); 475 476 // Create Decl objects for each parameter, adding them to the 477 // FunctionDecl. 478 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 479 llvm::SmallVector<ParmVarDecl*, 16> Params; 480 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 481 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 482 FT->getArgType(i), VarDecl::None, 0)); 483 New->setParams(Context, Params.data(), Params.size()); 484 } 485 486 AddKnownFunctionAttributes(New); 487 488 // TUScope is the translation-unit scope to insert this function into. 489 // FIXME: This is hideous. We need to teach PushOnScopeChains to 490 // relate Scopes to DeclContexts, and probably eliminate CurContext 491 // entirely, but we're not there yet. 492 DeclContext *SavedContext = CurContext; 493 CurContext = Context.getTranslationUnitDecl(); 494 PushOnScopeChains(New, TUScope); 495 CurContext = SavedContext; 496 return New; 497} 498 499/// GetStdNamespace - This method gets the C++ "std" namespace. This is where 500/// everything from the standard library is defined. 501NamespaceDecl *Sema::GetStdNamespace() { 502 if (!StdNamespace) { 503 IdentifierInfo *StdIdent = &PP.getIdentifierTable().get("std"); 504 DeclContext *Global = Context.getTranslationUnitDecl(); 505 Decl *Std = LookupQualifiedName(Global, StdIdent, LookupNamespaceName); 506 StdNamespace = dyn_cast_or_null<NamespaceDecl>(Std); 507 } 508 return StdNamespace; 509} 510 511/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 512/// same name and scope as a previous declaration 'Old'. Figure out 513/// how to resolve this situation, merging decls or emitting 514/// diagnostics as appropriate. If there was an error, set New to be invalid. 515/// 516void Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 517 // If either decl is known invalid already, set the new one to be invalid and 518 // don't bother doing any merging checks. 519 if (New->isInvalidDecl() || OldD->isInvalidDecl()) 520 return New->setInvalidDecl(); 521 522 // Allow multiple definitions for ObjC built-in typedefs. 523 // FIXME: Verify the underlying types are equivalent! 524 if (getLangOptions().ObjC1) { 525 const IdentifierInfo *TypeID = New->getIdentifier(); 526 switch (TypeID->getLength()) { 527 default: break; 528 case 2: 529 if (!TypeID->isStr("id")) 530 break; 531 // Install the built-in type for 'id', ignoring the current definition. 532 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 533 return; 534 case 5: 535 if (!TypeID->isStr("Class")) 536 break; 537 // Install the built-in type for 'Class', ignoring the current definition. 538 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 539 return; 540 case 3: 541 if (!TypeID->isStr("SEL")) 542 break; 543 Context.setObjCSelType(Context.getTypeDeclType(New)); 544 return; 545 case 8: 546 if (!TypeID->isStr("Protocol")) 547 break; 548 Context.setObjCProtoType(New->getUnderlyingType()); 549 return; 550 } 551 // Fall through - the typedef name was not a builtin type. 552 } 553 // Verify the old decl was also a type. 554 TypeDecl *Old = dyn_cast<TypeDecl>(OldD); 555 if (!Old) { 556 Diag(New->getLocation(), diag::err_redefinition_different_kind) 557 << New->getDeclName(); 558 if (OldD->getLocation().isValid()) 559 Diag(OldD->getLocation(), diag::note_previous_definition); 560 return New->setInvalidDecl(); 561 } 562 563 // Determine the "old" type we'll use for checking and diagnostics. 564 QualType OldType; 565 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 566 OldType = OldTypedef->getUnderlyingType(); 567 else 568 OldType = Context.getTypeDeclType(Old); 569 570 // If the typedef types are not identical, reject them in all languages and 571 // with any extensions enabled. 572 573 if (OldType != New->getUnderlyingType() && 574 Context.getCanonicalType(OldType) != 575 Context.getCanonicalType(New->getUnderlyingType())) { 576 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 577 << New->getUnderlyingType() << OldType; 578 if (Old->getLocation().isValid()) 579 Diag(Old->getLocation(), diag::note_previous_definition); 580 return New->setInvalidDecl(); 581 } 582 583 if (getLangOptions().Microsoft) 584 return; 585 586 // C++ [dcl.typedef]p2: 587 // In a given non-class scope, a typedef specifier can be used to 588 // redefine the name of any type declared in that scope to refer 589 // to the type to which it already refers. 590 if (getLangOptions().CPlusPlus) { 591 if (!isa<CXXRecordDecl>(CurContext)) 592 return; 593 Diag(New->getLocation(), diag::err_redefinition) 594 << New->getDeclName(); 595 Diag(Old->getLocation(), diag::note_previous_definition); 596 return New->setInvalidDecl(); 597 } 598 599 // If we have a redefinition of a typedef in C, emit a warning. This warning 600 // is normally mapped to an error, but can be controlled with 601 // -Wtypedef-redefinition. If either the original or the redefinition is 602 // in a system header, don't emit this for compatibility with GCC. 603 if (PP.getDiagnostics().getSuppressSystemWarnings() && 604 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 605 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 606 return; 607 608 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 609 << New->getDeclName(); 610 Diag(Old->getLocation(), diag::note_previous_definition); 611 return; 612} 613 614/// DeclhasAttr - returns true if decl Declaration already has the target 615/// attribute. 616static bool 617DeclHasAttr(const Decl *decl, const Attr *target) { 618 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 619 if (attr->getKind() == target->getKind()) 620 return true; 621 622 return false; 623} 624 625/// MergeAttributes - append attributes from the Old decl to the New one. 626static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 627 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 628 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 629 Attr *NewAttr = attr->clone(C); 630 NewAttr->setInherited(true); 631 New->addAttr(NewAttr); 632 } 633 } 634} 635 636/// Used in MergeFunctionDecl to keep track of function parameters in 637/// C. 638struct GNUCompatibleParamWarning { 639 ParmVarDecl *OldParm; 640 ParmVarDecl *NewParm; 641 QualType PromotedType; 642}; 643 644/// MergeFunctionDecl - We just parsed a function 'New' from 645/// declarator D which has the same name and scope as a previous 646/// declaration 'Old'. Figure out how to resolve this situation, 647/// merging decls or emitting diagnostics as appropriate. 648/// 649/// In C++, New and Old must be declarations that are not 650/// overloaded. Use IsOverload to determine whether New and Old are 651/// overloaded, and to select the Old declaration that New should be 652/// merged with. 653/// 654/// Returns true if there was an error, false otherwise. 655bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 656 assert(!isa<OverloadedFunctionDecl>(OldD) && 657 "Cannot merge with an overloaded function declaration"); 658 659 // Verify the old decl was also a function. 660 FunctionDecl *Old = 0; 661 if (FunctionTemplateDecl *OldFunctionTemplate 662 = dyn_cast<FunctionTemplateDecl>(OldD)) 663 Old = OldFunctionTemplate->getTemplatedDecl(); 664 else 665 Old = dyn_cast<FunctionDecl>(OldD); 666 if (!Old) { 667 Diag(New->getLocation(), diag::err_redefinition_different_kind) 668 << New->getDeclName(); 669 Diag(OldD->getLocation(), diag::note_previous_definition); 670 return true; 671 } 672 673 // Determine whether the previous declaration was a definition, 674 // implicit declaration, or a declaration. 675 diag::kind PrevDiag; 676 if (Old->isThisDeclarationADefinition()) 677 PrevDiag = diag::note_previous_definition; 678 else if (Old->isImplicit()) 679 PrevDiag = diag::note_previous_implicit_declaration; 680 else 681 PrevDiag = diag::note_previous_declaration; 682 683 QualType OldQType = Context.getCanonicalType(Old->getType()); 684 QualType NewQType = Context.getCanonicalType(New->getType()); 685 686 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 687 New->getStorageClass() == FunctionDecl::Static && 688 Old->getStorageClass() != FunctionDecl::Static) { 689 Diag(New->getLocation(), diag::err_static_non_static) 690 << New; 691 Diag(Old->getLocation(), PrevDiag); 692 return true; 693 } 694 695 if (getLangOptions().CPlusPlus) { 696 // (C++98 13.1p2): 697 // Certain function declarations cannot be overloaded: 698 // -- Function declarations that differ only in the return type 699 // cannot be overloaded. 700 QualType OldReturnType 701 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 702 QualType NewReturnType 703 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 704 if (OldReturnType != NewReturnType) { 705 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 706 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 707 return true; 708 } 709 710 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 711 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 712 if (OldMethod && NewMethod && 713 NewMethod->getLexicalDeclContext()->isRecord()) { 714 // -- Member function declarations with the same name and the 715 // same parameter types cannot be overloaded if any of them 716 // is a static member function declaration. 717 if (OldMethod->isStatic() || NewMethod->isStatic()) { 718 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 719 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 720 return true; 721 } 722 723 // C++ [class.mem]p1: 724 // [...] A member shall not be declared twice in the 725 // member-specification, except that a nested class or member 726 // class template can be declared and then later defined. 727 unsigned NewDiag; 728 if (isa<CXXConstructorDecl>(OldMethod)) 729 NewDiag = diag::err_constructor_redeclared; 730 else if (isa<CXXDestructorDecl>(NewMethod)) 731 NewDiag = diag::err_destructor_redeclared; 732 else if (isa<CXXConversionDecl>(NewMethod)) 733 NewDiag = diag::err_conv_function_redeclared; 734 else 735 NewDiag = diag::err_member_redeclared; 736 737 Diag(New->getLocation(), NewDiag); 738 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 739 } 740 741 // (C++98 8.3.5p3): 742 // All declarations for a function shall agree exactly in both the 743 // return type and the parameter-type-list. 744 if (OldQType == NewQType) 745 return MergeCompatibleFunctionDecls(New, Old); 746 747 // Fall through for conflicting redeclarations and redefinitions. 748 } 749 750 // C: Function types need to be compatible, not identical. This handles 751 // duplicate function decls like "void f(int); void f(enum X);" properly. 752 if (!getLangOptions().CPlusPlus && 753 Context.typesAreCompatible(OldQType, NewQType)) { 754 const FunctionType *OldFuncType = OldQType->getAsFunctionType(); 755 const FunctionType *NewFuncType = NewQType->getAsFunctionType(); 756 const FunctionProtoType *OldProto = 0; 757 if (isa<FunctionNoProtoType>(NewFuncType) && 758 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 759 // The old declaration provided a function prototype, but the 760 // new declaration does not. Merge in the prototype. 761 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 762 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 763 OldProto->arg_type_end()); 764 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 765 ParamTypes.data(), ParamTypes.size(), 766 OldProto->isVariadic(), 767 OldProto->getTypeQuals()); 768 New->setType(NewQType); 769 New->setHasInheritedPrototype(); 770 771 // Synthesize a parameter for each argument type. 772 llvm::SmallVector<ParmVarDecl*, 16> Params; 773 for (FunctionProtoType::arg_type_iterator 774 ParamType = OldProto->arg_type_begin(), 775 ParamEnd = OldProto->arg_type_end(); 776 ParamType != ParamEnd; ++ParamType) { 777 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 778 SourceLocation(), 0, 779 *ParamType, VarDecl::None, 780 0); 781 Param->setImplicit(); 782 Params.push_back(Param); 783 } 784 785 New->setParams(Context, Params.data(), Params.size()); 786 } 787 788 return MergeCompatibleFunctionDecls(New, Old); 789 } 790 791 // GNU C permits a K&R definition to follow a prototype declaration 792 // if the declared types of the parameters in the K&R definition 793 // match the types in the prototype declaration, even when the 794 // promoted types of the parameters from the K&R definition differ 795 // from the types in the prototype. GCC then keeps the types from 796 // the prototype. 797 // 798 // If a variadic prototype is followed by a non-variadic K&R definition, 799 // the K&R definition becomes variadic. This is sort of an edge case, but 800 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 801 // C99 6.9.1p8. 802 if (!getLangOptions().CPlusPlus && 803 Old->hasPrototype() && !New->hasPrototype() && 804 New->getType()->getAsFunctionProtoType() && 805 Old->getNumParams() == New->getNumParams()) { 806 llvm::SmallVector<QualType, 16> ArgTypes; 807 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 808 const FunctionProtoType *OldProto 809 = Old->getType()->getAsFunctionProtoType(); 810 const FunctionProtoType *NewProto 811 = New->getType()->getAsFunctionProtoType(); 812 813 // Determine whether this is the GNU C extension. 814 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 815 NewProto->getResultType()); 816 bool LooseCompatible = !MergedReturn.isNull(); 817 for (unsigned Idx = 0, End = Old->getNumParams(); 818 LooseCompatible && Idx != End; ++Idx) { 819 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 820 ParmVarDecl *NewParm = New->getParamDecl(Idx); 821 if (Context.typesAreCompatible(OldParm->getType(), 822 NewProto->getArgType(Idx))) { 823 ArgTypes.push_back(NewParm->getType()); 824 } else if (Context.typesAreCompatible(OldParm->getType(), 825 NewParm->getType())) { 826 GNUCompatibleParamWarning Warn 827 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 828 Warnings.push_back(Warn); 829 ArgTypes.push_back(NewParm->getType()); 830 } else 831 LooseCompatible = false; 832 } 833 834 if (LooseCompatible) { 835 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 836 Diag(Warnings[Warn].NewParm->getLocation(), 837 diag::ext_param_promoted_not_compatible_with_prototype) 838 << Warnings[Warn].PromotedType 839 << Warnings[Warn].OldParm->getType(); 840 Diag(Warnings[Warn].OldParm->getLocation(), 841 diag::note_previous_declaration); 842 } 843 844 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 845 ArgTypes.size(), 846 OldProto->isVariadic(), 0)); 847 return MergeCompatibleFunctionDecls(New, Old); 848 } 849 850 // Fall through to diagnose conflicting types. 851 } 852 853 // A function that has already been declared has been redeclared or defined 854 // with a different type- show appropriate diagnostic 855 if (unsigned BuiltinID = Old->getBuiltinID(Context)) { 856 // The user has declared a builtin function with an incompatible 857 // signature. 858 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 859 // The function the user is redeclaring is a library-defined 860 // function like 'malloc' or 'printf'. Warn about the 861 // redeclaration, then pretend that we don't know about this 862 // library built-in. 863 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 864 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 865 << Old << Old->getType(); 866 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 867 Old->setInvalidDecl(); 868 return false; 869 } 870 871 PrevDiag = diag::note_previous_builtin_declaration; 872 } 873 874 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 875 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 876 return true; 877} 878 879/// \brief Completes the merge of two function declarations that are 880/// known to be compatible. 881/// 882/// This routine handles the merging of attributes and other 883/// properties of function declarations form the old declaration to 884/// the new declaration, once we know that New is in fact a 885/// redeclaration of Old. 886/// 887/// \returns false 888bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 889 // Merge the attributes 890 MergeAttributes(New, Old, Context); 891 892 // Merge the storage class. 893 if (Old->getStorageClass() != FunctionDecl::Extern) 894 New->setStorageClass(Old->getStorageClass()); 895 896 // Merge "inline" 897 if (Old->isInline()) 898 New->setInline(true); 899 900 // If this function declaration by itself qualifies as a C99 inline 901 // definition (C99 6.7.4p6), but the previous definition did not, 902 // then the function is not a C99 inline definition. 903 if (New->isC99InlineDefinition() && !Old->isC99InlineDefinition()) 904 New->setC99InlineDefinition(false); 905 else if (Old->isC99InlineDefinition() && !New->isC99InlineDefinition()) { 906 // Mark all preceding definitions as not being C99 inline definitions. 907 for (const FunctionDecl *Prev = Old; Prev; 908 Prev = Prev->getPreviousDeclaration()) 909 const_cast<FunctionDecl *>(Prev)->setC99InlineDefinition(false); 910 } 911 912 // Merge "pure" flag. 913 if (Old->isPure()) 914 New->setPure(); 915 916 // Merge the "deleted" flag. 917 if (Old->isDeleted()) 918 New->setDeleted(); 919 920 if (getLangOptions().CPlusPlus) 921 return MergeCXXFunctionDecl(New, Old); 922 923 return false; 924} 925 926/// MergeVarDecl - We just parsed a variable 'New' which has the same name 927/// and scope as a previous declaration 'Old'. Figure out how to resolve this 928/// situation, merging decls or emitting diagnostics as appropriate. 929/// 930/// Tentative definition rules (C99 6.9.2p2) are checked by 931/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 932/// definitions here, since the initializer hasn't been attached. 933/// 934void Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 935 // If either decl is invalid, make sure the new one is marked invalid and 936 // don't do any other checking. 937 if (New->isInvalidDecl() || OldD->isInvalidDecl()) 938 return New->setInvalidDecl(); 939 940 // Verify the old decl was also a variable. 941 VarDecl *Old = dyn_cast<VarDecl>(OldD); 942 if (!Old) { 943 Diag(New->getLocation(), diag::err_redefinition_different_kind) 944 << New->getDeclName(); 945 Diag(OldD->getLocation(), diag::note_previous_definition); 946 return New->setInvalidDecl(); 947 } 948 949 MergeAttributes(New, Old, Context); 950 951 // Merge the types 952 QualType MergedT; 953 if (getLangOptions().CPlusPlus) { 954 if (Context.hasSameType(New->getType(), Old->getType())) 955 MergedT = New->getType(); 956 } else { 957 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 958 } 959 if (MergedT.isNull()) { 960 Diag(New->getLocation(), diag::err_redefinition_different_type) 961 << New->getDeclName(); 962 Diag(Old->getLocation(), diag::note_previous_definition); 963 return New->setInvalidDecl(); 964 } 965 New->setType(MergedT); 966 967 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 968 if (New->getStorageClass() == VarDecl::Static && 969 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 970 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 971 Diag(Old->getLocation(), diag::note_previous_definition); 972 return New->setInvalidDecl(); 973 } 974 // C99 6.2.2p4: 975 // For an identifier declared with the storage-class specifier 976 // extern in a scope in which a prior declaration of that 977 // identifier is visible,23) if the prior declaration specifies 978 // internal or external linkage, the linkage of the identifier at 979 // the later declaration is the same as the linkage specified at 980 // the prior declaration. If no prior declaration is visible, or 981 // if the prior declaration specifies no linkage, then the 982 // identifier has external linkage. 983 if (New->hasExternalStorage() && Old->hasLinkage()) 984 /* Okay */; 985 else if (New->getStorageClass() != VarDecl::Static && 986 Old->getStorageClass() == VarDecl::Static) { 987 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 988 Diag(Old->getLocation(), diag::note_previous_definition); 989 return New->setInvalidDecl(); 990 } 991 992 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 993 994 // FIXME: The test for external storage here seems wrong? We still 995 // need to check for mismatches. 996 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 997 // Don't complain about out-of-line definitions of static members. 998 !(Old->getLexicalDeclContext()->isRecord() && 999 !New->getLexicalDeclContext()->isRecord())) { 1000 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1001 Diag(Old->getLocation(), diag::note_previous_definition); 1002 return New->setInvalidDecl(); 1003 } 1004 1005 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1006 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1007 Diag(Old->getLocation(), diag::note_previous_definition); 1008 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1009 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1010 Diag(Old->getLocation(), diag::note_previous_definition); 1011 } 1012 1013 // Keep a chain of previous declarations. 1014 New->setPreviousDeclaration(Old); 1015} 1016 1017Sema::ControlFlowKind Sema::CheckFallThrough(Stmt *Root) { 1018 llvm::OwningPtr<CFG> cfg (CFG::buildCFG(Root, &Context)); 1019 1020 // FIXME: They should never return 0, fix that, delete this code. 1021 if (cfg == 0) 1022 return NeverFallThrough; 1023 // The CFG leaves in dead things, run a simple mark and sweep on it 1024 // to weed out the trivially dead things. 1025 std::queue<CFGBlock*> workq; 1026 llvm::OwningArrayPtr<char> live(new char[cfg->getNumBlockIDs()]); 1027 // Prep work queue 1028 workq.push(&cfg->getEntry()); 1029 // Solve 1030 while (!workq.empty()) { 1031 CFGBlock *item = workq.front(); 1032 workq.pop(); 1033 live[item->getBlockID()] = 1; 1034 CFGBlock::succ_iterator i; 1035 for (i=item->succ_begin(); i != item->succ_end(); ++i) { 1036 if ((*i) && ! live[(*i)->getBlockID()]) { 1037 live[(*i)->getBlockID()] = 1; 1038 workq.push(*i); 1039 } 1040 } 1041 } 1042 1043 CFGBlock::succ_iterator i; 1044 bool HasLiveReturn = false; 1045 bool HasFakeEdge = false; 1046 bool HasPlainEdge = false; 1047 for (i=cfg->getExit().pred_begin(); i != cfg->getExit().pred_end(); ++i) { 1048 if (!live[(*i)->getBlockID()]) 1049 continue; 1050 if ((*i)->size() == 0) { 1051 // A labeled empty statement, or the entry block... 1052 HasPlainEdge = true; 1053 continue; 1054 } 1055 Stmt *S = (**i)[(*i)->size()-1]; 1056 if (isa<ReturnStmt>(S)) { 1057 HasLiveReturn = true; 1058 continue; 1059 } 1060 if (isa<ObjCAtThrowStmt>(S)) { 1061 HasFakeEdge = true; 1062 continue; 1063 } 1064 if (isa<CXXThrowExpr>(S)) { 1065 HasFakeEdge = true; 1066 continue; 1067 } 1068 bool NoReturnEdge = false; 1069 if (CallExpr *C = dyn_cast<CallExpr>(S)) 1070 { 1071 Expr *CEE = C->getCallee()->IgnoreParenCasts(); 1072 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) { 1073 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(DRE->getDecl())) { 1074 if (FD->hasAttr<NoReturnAttr>()) { 1075 NoReturnEdge = true; 1076 HasFakeEdge = true; 1077 } 1078 } 1079 } 1080 } 1081 if (NoReturnEdge == false) 1082 HasPlainEdge = true; 1083 } 1084 if (HasPlainEdge) { 1085 if (HasFakeEdge|HasLiveReturn) 1086 return MaybeFallThrough; 1087 // This says never for calls to functions that are not marked noreturn, that 1088 // don't return. For people that don't like this, we encourage marking the 1089 // functions as noreturn. 1090 return AlwaysFallThrough; 1091 } 1092 return NeverFallThrough; 1093} 1094 1095/// CheckFallThroughForFunctionDef - Check that we don't fall off the end of a 1096/// function that should return a value. 1097/// 1098/// \returns Never iff we can never alter control flow (we always fall off the 1099/// end of the statement, Conditional iff we might or might not alter 1100/// control-flow and Always iff we always alter control flow (we never fall off 1101/// the end of the statement). 1102void Sema::CheckFallThroughForFunctionDef(Decl *D, Stmt *Body) { 1103 // FIXME: Would be nice if we had a better way to control cascding errors, but 1104 // for now, avoid them. 1105 if (getDiagnostics().hasErrorOccurred()) 1106 return; 1107 if (Diags.getDiagnosticLevel(diag::warn_maybe_falloff_nonvoid_function) 1108 == Diagnostic::Ignored) 1109 return; 1110 // FIXME: Funtion try block 1111 if (CompoundStmt *Compound = dyn_cast<CompoundStmt>(Body)) { 1112 switch (CheckFallThrough(Body)) { 1113 case MaybeFallThrough: 1114 Diag(Compound->getRBracLoc(), diag::warn_maybe_falloff_nonvoid_function); 1115 break; 1116 case AlwaysFallThrough: 1117 Diag(Compound->getRBracLoc(), diag::warn_falloff_nonvoid_function); 1118 break; 1119 case NeverFallThrough: 1120 break; 1121 } 1122 } 1123} 1124 1125/// CheckParmsForFunctionDef - Check that the parameters of the given 1126/// function are appropriate for the definition of a function. This 1127/// takes care of any checks that cannot be performed on the 1128/// declaration itself, e.g., that the types of each of the function 1129/// parameters are complete. 1130bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 1131 bool HasInvalidParm = false; 1132 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 1133 ParmVarDecl *Param = FD->getParamDecl(p); 1134 1135 // C99 6.7.5.3p4: the parameters in a parameter type list in a 1136 // function declarator that is part of a function definition of 1137 // that function shall not have incomplete type. 1138 // 1139 // This is also C++ [dcl.fct]p6. 1140 if (!Param->isInvalidDecl() && 1141 RequireCompleteType(Param->getLocation(), Param->getType(), 1142 diag::err_typecheck_decl_incomplete_type)) { 1143 Param->setInvalidDecl(); 1144 HasInvalidParm = true; 1145 } 1146 1147 // C99 6.9.1p5: If the declarator includes a parameter type list, the 1148 // declaration of each parameter shall include an identifier. 1149 if (Param->getIdentifier() == 0 && 1150 !Param->isImplicit() && 1151 !getLangOptions().CPlusPlus) 1152 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 1153 } 1154 1155 return HasInvalidParm; 1156} 1157 1158/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1159/// no declarator (e.g. "struct foo;") is parsed. 1160Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1161 // FIXME: Error on auto/register at file scope 1162 // FIXME: Error on inline/virtual/explicit 1163 // FIXME: Error on invalid restrict 1164 // FIXME: Warn on useless __thread 1165 // FIXME: Warn on useless const/volatile 1166 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1167 // FIXME: Warn on useless attributes 1168 TagDecl *Tag = 0; 1169 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1170 DS.getTypeSpecType() == DeclSpec::TST_struct || 1171 DS.getTypeSpecType() == DeclSpec::TST_union || 1172 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1173 if (!DS.getTypeRep()) // We probably had an error 1174 return DeclPtrTy(); 1175 1176 Tag = dyn_cast<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 1177 } 1178 1179 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1180 if (!Record->getDeclName() && Record->isDefinition() && 1181 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1182 if (getLangOptions().CPlusPlus || 1183 Record->getDeclContext()->isRecord()) 1184 return BuildAnonymousStructOrUnion(S, DS, Record); 1185 1186 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1187 << DS.getSourceRange(); 1188 } 1189 1190 // Microsoft allows unnamed struct/union fields. Don't complain 1191 // about them. 1192 // FIXME: Should we support Microsoft's extensions in this area? 1193 if (Record->getDeclName() && getLangOptions().Microsoft) 1194 return DeclPtrTy::make(Tag); 1195 } 1196 1197 if (!DS.isMissingDeclaratorOk() && 1198 DS.getTypeSpecType() != DeclSpec::TST_error) { 1199 // Warn about typedefs of enums without names, since this is an 1200 // extension in both Microsoft an GNU. 1201 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1202 Tag && isa<EnumDecl>(Tag)) { 1203 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1204 << DS.getSourceRange(); 1205 return DeclPtrTy::make(Tag); 1206 } 1207 1208 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1209 << DS.getSourceRange(); 1210 return DeclPtrTy(); 1211 } 1212 1213 return DeclPtrTy::make(Tag); 1214} 1215 1216/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1217/// anonymous struct or union AnonRecord into the owning context Owner 1218/// and scope S. This routine will be invoked just after we realize 1219/// that an unnamed union or struct is actually an anonymous union or 1220/// struct, e.g., 1221/// 1222/// @code 1223/// union { 1224/// int i; 1225/// float f; 1226/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1227/// // f into the surrounding scope.x 1228/// @endcode 1229/// 1230/// This routine is recursive, injecting the names of nested anonymous 1231/// structs/unions into the owning context and scope as well. 1232bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1233 RecordDecl *AnonRecord) { 1234 bool Invalid = false; 1235 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1236 FEnd = AnonRecord->field_end(); 1237 F != FEnd; ++F) { 1238 if ((*F)->getDeclName()) { 1239 NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 1240 LookupOrdinaryName, true); 1241 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 1242 // C++ [class.union]p2: 1243 // The names of the members of an anonymous union shall be 1244 // distinct from the names of any other entity in the 1245 // scope in which the anonymous union is declared. 1246 unsigned diagKind 1247 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 1248 : diag::err_anonymous_struct_member_redecl; 1249 Diag((*F)->getLocation(), diagKind) 1250 << (*F)->getDeclName(); 1251 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1252 Invalid = true; 1253 } else { 1254 // C++ [class.union]p2: 1255 // For the purpose of name lookup, after the anonymous union 1256 // definition, the members of the anonymous union are 1257 // considered to have been defined in the scope in which the 1258 // anonymous union is declared. 1259 Owner->makeDeclVisibleInContext(*F); 1260 S->AddDecl(DeclPtrTy::make(*F)); 1261 IdResolver.AddDecl(*F); 1262 } 1263 } else if (const RecordType *InnerRecordType 1264 = (*F)->getType()->getAsRecordType()) { 1265 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1266 if (InnerRecord->isAnonymousStructOrUnion()) 1267 Invalid = Invalid || 1268 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1269 } 1270 } 1271 1272 return Invalid; 1273} 1274 1275/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1276/// anonymous structure or union. Anonymous unions are a C++ feature 1277/// (C++ [class.union]) and a GNU C extension; anonymous structures 1278/// are a GNU C and GNU C++ extension. 1279Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1280 RecordDecl *Record) { 1281 DeclContext *Owner = Record->getDeclContext(); 1282 1283 // Diagnose whether this anonymous struct/union is an extension. 1284 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1285 Diag(Record->getLocation(), diag::ext_anonymous_union); 1286 else if (!Record->isUnion()) 1287 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1288 1289 // C and C++ require different kinds of checks for anonymous 1290 // structs/unions. 1291 bool Invalid = false; 1292 if (getLangOptions().CPlusPlus) { 1293 const char* PrevSpec = 0; 1294 // C++ [class.union]p3: 1295 // Anonymous unions declared in a named namespace or in the 1296 // global namespace shall be declared static. 1297 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1298 (isa<TranslationUnitDecl>(Owner) || 1299 (isa<NamespaceDecl>(Owner) && 1300 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1301 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1302 Invalid = true; 1303 1304 // Recover by adding 'static'. 1305 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); 1306 } 1307 // C++ [class.union]p3: 1308 // A storage class is not allowed in a declaration of an 1309 // anonymous union in a class scope. 1310 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1311 isa<RecordDecl>(Owner)) { 1312 Diag(DS.getStorageClassSpecLoc(), 1313 diag::err_anonymous_union_with_storage_spec); 1314 Invalid = true; 1315 1316 // Recover by removing the storage specifier. 1317 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1318 PrevSpec); 1319 } 1320 1321 // C++ [class.union]p2: 1322 // The member-specification of an anonymous union shall only 1323 // define non-static data members. [Note: nested types and 1324 // functions cannot be declared within an anonymous union. ] 1325 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1326 MemEnd = Record->decls_end(); 1327 Mem != MemEnd; ++Mem) { 1328 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1329 // C++ [class.union]p3: 1330 // An anonymous union shall not have private or protected 1331 // members (clause 11). 1332 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1333 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1334 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1335 Invalid = true; 1336 } 1337 } else if ((*Mem)->isImplicit()) { 1338 // Any implicit members are fine. 1339 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1340 // This is a type that showed up in an 1341 // elaborated-type-specifier inside the anonymous struct or 1342 // union, but which actually declares a type outside of the 1343 // anonymous struct or union. It's okay. 1344 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1345 if (!MemRecord->isAnonymousStructOrUnion() && 1346 MemRecord->getDeclName()) { 1347 // This is a nested type declaration. 1348 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1349 << (int)Record->isUnion(); 1350 Invalid = true; 1351 } 1352 } else { 1353 // We have something that isn't a non-static data 1354 // member. Complain about it. 1355 unsigned DK = diag::err_anonymous_record_bad_member; 1356 if (isa<TypeDecl>(*Mem)) 1357 DK = diag::err_anonymous_record_with_type; 1358 else if (isa<FunctionDecl>(*Mem)) 1359 DK = diag::err_anonymous_record_with_function; 1360 else if (isa<VarDecl>(*Mem)) 1361 DK = diag::err_anonymous_record_with_static; 1362 Diag((*Mem)->getLocation(), DK) 1363 << (int)Record->isUnion(); 1364 Invalid = true; 1365 } 1366 } 1367 } 1368 1369 if (!Record->isUnion() && !Owner->isRecord()) { 1370 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1371 << (int)getLangOptions().CPlusPlus; 1372 Invalid = true; 1373 } 1374 1375 // Create a declaration for this anonymous struct/union. 1376 NamedDecl *Anon = 0; 1377 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1378 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1379 /*IdentifierInfo=*/0, 1380 Context.getTypeDeclType(Record), 1381 /*BitWidth=*/0, /*Mutable=*/false, 1382 DS.getSourceRange().getBegin()); 1383 Anon->setAccess(AS_public); 1384 if (getLangOptions().CPlusPlus) 1385 FieldCollector->Add(cast<FieldDecl>(Anon)); 1386 } else { 1387 VarDecl::StorageClass SC; 1388 switch (DS.getStorageClassSpec()) { 1389 default: assert(0 && "Unknown storage class!"); 1390 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1391 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1392 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1393 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1394 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1395 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1396 case DeclSpec::SCS_mutable: 1397 // mutable can only appear on non-static class members, so it's always 1398 // an error here 1399 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1400 Invalid = true; 1401 SC = VarDecl::None; 1402 break; 1403 } 1404 1405 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1406 /*IdentifierInfo=*/0, 1407 Context.getTypeDeclType(Record), 1408 SC, DS.getSourceRange().getBegin()); 1409 } 1410 Anon->setImplicit(); 1411 1412 // Add the anonymous struct/union object to the current 1413 // context. We'll be referencing this object when we refer to one of 1414 // its members. 1415 Owner->addDecl(Anon); 1416 1417 // Inject the members of the anonymous struct/union into the owning 1418 // context and into the identifier resolver chain for name lookup 1419 // purposes. 1420 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1421 Invalid = true; 1422 1423 // Mark this as an anonymous struct/union type. Note that we do not 1424 // do this until after we have already checked and injected the 1425 // members of this anonymous struct/union type, because otherwise 1426 // the members could be injected twice: once by DeclContext when it 1427 // builds its lookup table, and once by 1428 // InjectAnonymousStructOrUnionMembers. 1429 Record->setAnonymousStructOrUnion(true); 1430 1431 if (Invalid) 1432 Anon->setInvalidDecl(); 1433 1434 return DeclPtrTy::make(Anon); 1435} 1436 1437 1438/// GetNameForDeclarator - Determine the full declaration name for the 1439/// given Declarator. 1440DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1441 switch (D.getKind()) { 1442 case Declarator::DK_Abstract: 1443 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 1444 return DeclarationName(); 1445 1446 case Declarator::DK_Normal: 1447 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 1448 return DeclarationName(D.getIdentifier()); 1449 1450 case Declarator::DK_Constructor: { 1451 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1452 Ty = Context.getCanonicalType(Ty); 1453 return Context.DeclarationNames.getCXXConstructorName(Ty); 1454 } 1455 1456 case Declarator::DK_Destructor: { 1457 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1458 Ty = Context.getCanonicalType(Ty); 1459 return Context.DeclarationNames.getCXXDestructorName(Ty); 1460 } 1461 1462 case Declarator::DK_Conversion: { 1463 // FIXME: We'd like to keep the non-canonical type for diagnostics! 1464 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1465 Ty = Context.getCanonicalType(Ty); 1466 return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 1467 } 1468 1469 case Declarator::DK_Operator: 1470 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 1471 return Context.DeclarationNames.getCXXOperatorName( 1472 D.getOverloadedOperator()); 1473 } 1474 1475 assert(false && "Unknown name kind"); 1476 return DeclarationName(); 1477} 1478 1479/// isNearlyMatchingFunction - Determine whether the C++ functions 1480/// Declaration and Definition are "nearly" matching. This heuristic 1481/// is used to improve diagnostics in the case where an out-of-line 1482/// function definition doesn't match any declaration within 1483/// the class or namespace. 1484static bool isNearlyMatchingFunction(ASTContext &Context, 1485 FunctionDecl *Declaration, 1486 FunctionDecl *Definition) { 1487 if (Declaration->param_size() != Definition->param_size()) 1488 return false; 1489 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1490 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1491 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1492 1493 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1494 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 1495 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1496 return false; 1497 } 1498 1499 return true; 1500} 1501 1502Sema::DeclPtrTy 1503Sema::HandleDeclarator(Scope *S, Declarator &D, 1504 MultiTemplateParamsArg TemplateParamLists, 1505 bool IsFunctionDefinition) { 1506 DeclarationName Name = GetNameForDeclarator(D); 1507 1508 // All of these full declarators require an identifier. If it doesn't have 1509 // one, the ParsedFreeStandingDeclSpec action should be used. 1510 if (!Name) { 1511 if (!D.isInvalidType()) // Reject this if we think it is valid. 1512 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1513 diag::err_declarator_need_ident) 1514 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1515 return DeclPtrTy(); 1516 } 1517 1518 // The scope passed in may not be a decl scope. Zip up the scope tree until 1519 // we find one that is. 1520 while ((S->getFlags() & Scope::DeclScope) == 0 || 1521 (S->getFlags() & Scope::TemplateParamScope) != 0) 1522 S = S->getParent(); 1523 1524 DeclContext *DC; 1525 NamedDecl *PrevDecl; 1526 NamedDecl *New; 1527 1528 QualType R = GetTypeForDeclarator(D, S); 1529 1530 // See if this is a redefinition of a variable in the same scope. 1531 if (D.getCXXScopeSpec().isInvalid()) { 1532 DC = CurContext; 1533 PrevDecl = 0; 1534 D.setInvalidType(); 1535 } else if (!D.getCXXScopeSpec().isSet()) { 1536 LookupNameKind NameKind = LookupOrdinaryName; 1537 1538 // If the declaration we're planning to build will be a function 1539 // or object with linkage, then look for another declaration with 1540 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1541 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1542 /* Do nothing*/; 1543 else if (R->isFunctionType()) { 1544 if (CurContext->isFunctionOrMethod() || 1545 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1546 NameKind = LookupRedeclarationWithLinkage; 1547 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1548 NameKind = LookupRedeclarationWithLinkage; 1549 else if (CurContext->getLookupContext()->isTranslationUnit() && 1550 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1551 NameKind = LookupRedeclarationWithLinkage; 1552 1553 DC = CurContext; 1554 PrevDecl = LookupName(S, Name, NameKind, true, 1555 NameKind == LookupRedeclarationWithLinkage, 1556 D.getIdentifierLoc()); 1557 } else { // Something like "int foo::x;" 1558 DC = computeDeclContext(D.getCXXScopeSpec(), true); 1559 // FIXME: RequireCompleteDeclContext(D.getCXXScopeSpec()); ? 1560 PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName, true); 1561 1562 // C++ 7.3.1.2p2: 1563 // Members (including explicit specializations of templates) of a named 1564 // namespace can also be defined outside that namespace by explicit 1565 // qualification of the name being defined, provided that the entity being 1566 // defined was already declared in the namespace and the definition appears 1567 // after the point of declaration in a namespace that encloses the 1568 // declarations namespace. 1569 // 1570 // Note that we only check the context at this point. We don't yet 1571 // have enough information to make sure that PrevDecl is actually 1572 // the declaration we want to match. For example, given: 1573 // 1574 // class X { 1575 // void f(); 1576 // void f(float); 1577 // }; 1578 // 1579 // void X::f(int) { } // ill-formed 1580 // 1581 // In this case, PrevDecl will point to the overload set 1582 // containing the two f's declared in X, but neither of them 1583 // matches. 1584 1585 // First check whether we named the global scope. 1586 if (isa<TranslationUnitDecl>(DC)) { 1587 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1588 << Name << D.getCXXScopeSpec().getRange(); 1589 } else if (!CurContext->Encloses(DC)) { 1590 // The qualifying scope doesn't enclose the original declaration. 1591 // Emit diagnostic based on current scope. 1592 SourceLocation L = D.getIdentifierLoc(); 1593 SourceRange R = D.getCXXScopeSpec().getRange(); 1594 if (isa<FunctionDecl>(CurContext)) 1595 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1596 else 1597 Diag(L, diag::err_invalid_declarator_scope) 1598 << Name << cast<NamedDecl>(DC) << R; 1599 D.setInvalidType(); 1600 } 1601 } 1602 1603 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1604 // Maybe we will complain about the shadowed template parameter. 1605 if (!D.isInvalidType()) 1606 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl)) 1607 D.setInvalidType(); 1608 1609 // Just pretend that we didn't see the previous declaration. 1610 PrevDecl = 0; 1611 } 1612 1613 // In C++, the previous declaration we find might be a tag type 1614 // (class or enum). In this case, the new declaration will hide the 1615 // tag type. Note that this does does not apply if we're declaring a 1616 // typedef (C++ [dcl.typedef]p4). 1617 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 1618 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1619 PrevDecl = 0; 1620 1621 bool Redeclaration = false; 1622 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1623 if (TemplateParamLists.size()) { 1624 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 1625 return DeclPtrTy(); 1626 } 1627 1628 New = ActOnTypedefDeclarator(S, D, DC, R, PrevDecl, Redeclaration); 1629 } else if (R->isFunctionType()) { 1630 New = ActOnFunctionDeclarator(S, D, DC, R, PrevDecl, 1631 move(TemplateParamLists), 1632 IsFunctionDefinition, Redeclaration); 1633 } else { 1634 New = ActOnVariableDeclarator(S, D, DC, R, PrevDecl, 1635 move(TemplateParamLists), 1636 Redeclaration); 1637 } 1638 1639 if (New == 0) 1640 return DeclPtrTy(); 1641 1642 // If this has an identifier and is not an invalid redeclaration, 1643 // add it to the scope stack. 1644 if (Name && !(Redeclaration && New->isInvalidDecl())) 1645 PushOnScopeChains(New, S); 1646 1647 return DeclPtrTy::make(New); 1648} 1649 1650/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 1651/// types into constant array types in certain situations which would otherwise 1652/// be errors (for GCC compatibility). 1653static QualType TryToFixInvalidVariablyModifiedType(QualType T, 1654 ASTContext &Context, 1655 bool &SizeIsNegative) { 1656 // This method tries to turn a variable array into a constant 1657 // array even when the size isn't an ICE. This is necessary 1658 // for compatibility with code that depends on gcc's buggy 1659 // constant expression folding, like struct {char x[(int)(char*)2];} 1660 SizeIsNegative = false; 1661 1662 if (const PointerType* PTy = dyn_cast<PointerType>(T)) { 1663 QualType Pointee = PTy->getPointeeType(); 1664 QualType FixedType = 1665 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 1666 if (FixedType.isNull()) return FixedType; 1667 FixedType = Context.getPointerType(FixedType); 1668 FixedType.setCVRQualifiers(T.getCVRQualifiers()); 1669 return FixedType; 1670 } 1671 1672 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 1673 if (!VLATy) 1674 return QualType(); 1675 // FIXME: We should probably handle this case 1676 if (VLATy->getElementType()->isVariablyModifiedType()) 1677 return QualType(); 1678 1679 Expr::EvalResult EvalResult; 1680 if (!VLATy->getSizeExpr() || 1681 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 1682 !EvalResult.Val.isInt()) 1683 return QualType(); 1684 1685 llvm::APSInt &Res = EvalResult.Val.getInt(); 1686 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 1687 Expr* ArySizeExpr = VLATy->getSizeExpr(); 1688 // FIXME: here we could "steal" (how?) ArySizeExpr from the VLA, 1689 // so as to transfer ownership to the ConstantArrayWithExpr. 1690 // Alternatively, we could "clone" it (how?). 1691 // Since we don't know how to do things above, we just use the 1692 // very same Expr*. 1693 return Context.getConstantArrayWithExprType(VLATy->getElementType(), 1694 Res, ArySizeExpr, 1695 ArrayType::Normal, 0, 1696 VLATy->getBracketsRange()); 1697 } 1698 1699 SizeIsNegative = true; 1700 return QualType(); 1701} 1702 1703/// \brief Register the given locally-scoped external C declaration so 1704/// that it can be found later for redeclarations 1705void 1706Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, NamedDecl *PrevDecl, 1707 Scope *S) { 1708 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 1709 "Decl is not a locally-scoped decl!"); 1710 // Note that we have a locally-scoped external with this name. 1711 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 1712 1713 if (!PrevDecl) 1714 return; 1715 1716 // If there was a previous declaration of this variable, it may be 1717 // in our identifier chain. Update the identifier chain with the new 1718 // declaration. 1719 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 1720 // The previous declaration was found on the identifer resolver 1721 // chain, so remove it from its scope. 1722 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 1723 S = S->getParent(); 1724 1725 if (S) 1726 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 1727 } 1728} 1729 1730/// \brief Diagnose function specifiers on a declaration of an identifier that 1731/// does not identify a function. 1732void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 1733 // FIXME: We should probably indicate the identifier in question to avoid 1734 // confusion for constructs like "inline int a(), b;" 1735 if (D.getDeclSpec().isInlineSpecified()) 1736 Diag(D.getDeclSpec().getInlineSpecLoc(), 1737 diag::err_inline_non_function); 1738 1739 if (D.getDeclSpec().isVirtualSpecified()) 1740 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1741 diag::err_virtual_non_function); 1742 1743 if (D.getDeclSpec().isExplicitSpecified()) 1744 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1745 diag::err_explicit_non_function); 1746} 1747 1748NamedDecl* 1749Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1750 QualType R, Decl* PrevDecl, bool &Redeclaration) { 1751 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1752 if (D.getCXXScopeSpec().isSet()) { 1753 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1754 << D.getCXXScopeSpec().getRange(); 1755 D.setInvalidType(); 1756 // Pretend we didn't see the scope specifier. 1757 DC = 0; 1758 } 1759 1760 if (getLangOptions().CPlusPlus) { 1761 // Check that there are no default arguments (C++ only). 1762 CheckExtraCXXDefaultArguments(D); 1763 } 1764 1765 DiagnoseFunctionSpecifiers(D); 1766 1767 if (D.getDeclSpec().isThreadSpecified()) 1768 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 1769 1770 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R); 1771 if (!NewTD) return 0; 1772 1773 if (D.isInvalidType()) 1774 NewTD->setInvalidDecl(); 1775 1776 // Handle attributes prior to checking for duplicates in MergeVarDecl 1777 ProcessDeclAttributes(S, NewTD, D); 1778 // Merge the decl with the existing one if appropriate. If the decl is 1779 // in an outer scope, it isn't the same thing. 1780 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1781 Redeclaration = true; 1782 MergeTypeDefDecl(NewTD, PrevDecl); 1783 } 1784 1785 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1786 // then it shall have block scope. 1787 QualType T = NewTD->getUnderlyingType(); 1788 if (T->isVariablyModifiedType()) { 1789 CurFunctionNeedsScopeChecking = true; 1790 1791 if (S->getFnParent() == 0) { 1792 bool SizeIsNegative; 1793 QualType FixedTy = 1794 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1795 if (!FixedTy.isNull()) { 1796 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 1797 NewTD->setUnderlyingType(FixedTy); 1798 } else { 1799 if (SizeIsNegative) 1800 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 1801 else if (T->isVariableArrayType()) 1802 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1803 else 1804 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1805 NewTD->setInvalidDecl(); 1806 } 1807 } 1808 } 1809 1810 // If this is the C FILE type, notify the AST context. 1811 if (IdentifierInfo *II = NewTD->getIdentifier()) 1812 if (!NewTD->isInvalidDecl() && 1813 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit() && 1814 II->isStr("FILE")) 1815 Context.setFILEDecl(NewTD); 1816 1817 return NewTD; 1818} 1819 1820/// \brief Determines whether the given declaration is an out-of-scope 1821/// previous declaration. 1822/// 1823/// This routine should be invoked when name lookup has found a 1824/// previous declaration (PrevDecl) that is not in the scope where a 1825/// new declaration by the same name is being introduced. If the new 1826/// declaration occurs in a local scope, previous declarations with 1827/// linkage may still be considered previous declarations (C99 1828/// 6.2.2p4-5, C++ [basic.link]p6). 1829/// 1830/// \param PrevDecl the previous declaration found by name 1831/// lookup 1832/// 1833/// \param DC the context in which the new declaration is being 1834/// declared. 1835/// 1836/// \returns true if PrevDecl is an out-of-scope previous declaration 1837/// for a new delcaration with the same name. 1838static bool 1839isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 1840 ASTContext &Context) { 1841 if (!PrevDecl) 1842 return 0; 1843 1844 // FIXME: PrevDecl could be an OverloadedFunctionDecl, in which 1845 // case we need to check each of the overloaded functions. 1846 if (!PrevDecl->hasLinkage()) 1847 return false; 1848 1849 if (Context.getLangOptions().CPlusPlus) { 1850 // C++ [basic.link]p6: 1851 // If there is a visible declaration of an entity with linkage 1852 // having the same name and type, ignoring entities declared 1853 // outside the innermost enclosing namespace scope, the block 1854 // scope declaration declares that same entity and receives the 1855 // linkage of the previous declaration. 1856 DeclContext *OuterContext = DC->getLookupContext(); 1857 if (!OuterContext->isFunctionOrMethod()) 1858 // This rule only applies to block-scope declarations. 1859 return false; 1860 else { 1861 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 1862 if (PrevOuterContext->isRecord()) 1863 // We found a member function: ignore it. 1864 return false; 1865 else { 1866 // Find the innermost enclosing namespace for the new and 1867 // previous declarations. 1868 while (!OuterContext->isFileContext()) 1869 OuterContext = OuterContext->getParent(); 1870 while (!PrevOuterContext->isFileContext()) 1871 PrevOuterContext = PrevOuterContext->getParent(); 1872 1873 // The previous declaration is in a different namespace, so it 1874 // isn't the same function. 1875 if (OuterContext->getPrimaryContext() != 1876 PrevOuterContext->getPrimaryContext()) 1877 return false; 1878 } 1879 } 1880 } 1881 1882 return true; 1883} 1884 1885NamedDecl* 1886Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1887 QualType R,NamedDecl* PrevDecl, 1888 MultiTemplateParamsArg TemplateParamLists, 1889 bool &Redeclaration) { 1890 DeclarationName Name = GetNameForDeclarator(D); 1891 1892 // Check that there are no default arguments (C++ only). 1893 if (getLangOptions().CPlusPlus) 1894 CheckExtraCXXDefaultArguments(D); 1895 1896 VarDecl *NewVD; 1897 VarDecl::StorageClass SC; 1898 switch (D.getDeclSpec().getStorageClassSpec()) { 1899 default: assert(0 && "Unknown storage class!"); 1900 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1901 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1902 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1903 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1904 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1905 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1906 case DeclSpec::SCS_mutable: 1907 // mutable can only appear on non-static class members, so it's always 1908 // an error here 1909 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1910 D.setInvalidType(); 1911 SC = VarDecl::None; 1912 break; 1913 } 1914 1915 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1916 if (!II) { 1917 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1918 << Name.getAsString(); 1919 return 0; 1920 } 1921 1922 DiagnoseFunctionSpecifiers(D); 1923 1924 if (!DC->isRecord() && S->getFnParent() == 0) { 1925 // C99 6.9p2: The storage-class specifiers auto and register shall not 1926 // appear in the declaration specifiers in an external declaration. 1927 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 1928 1929 // If this is a register variable with an asm label specified, then this 1930 // is a GNU extension. 1931 if (SC == VarDecl::Register && D.getAsmLabel()) 1932 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 1933 else 1934 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 1935 D.setInvalidType(); 1936 } 1937 } 1938 if (DC->isRecord() && !CurContext->isRecord()) { 1939 // This is an out-of-line definition of a static data member. 1940 if (SC == VarDecl::Static) { 1941 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1942 diag::err_static_out_of_line) 1943 << CodeModificationHint::CreateRemoval( 1944 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 1945 } else if (SC == VarDecl::None) 1946 SC = VarDecl::Static; 1947 } 1948 if (SC == VarDecl::Static) { 1949 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 1950 if (RD->isLocalClass()) 1951 Diag(D.getIdentifierLoc(), 1952 diag::err_static_data_member_not_allowed_in_local_class) 1953 << Name << RD->getDeclName(); 1954 } 1955 } 1956 1957 // Check that we can declare a template here. 1958 if (TemplateParamLists.size() && 1959 CheckTemplateDeclScope(S, TemplateParamLists)) 1960 return 0; 1961 1962 // Match up the template parameter lists with the scope specifier, then 1963 // determine whether we have a template or a template specialization. 1964 if (TemplateParameterList *TemplateParams 1965 = MatchTemplateParametersToScopeSpecifier( 1966 D.getDeclSpec().getSourceRange().getBegin(), 1967 D.getCXXScopeSpec(), 1968 (TemplateParameterList**)TemplateParamLists.get(), 1969 TemplateParamLists.size())) { 1970 if (TemplateParams->size() > 0) { 1971 // There is no such thing as a variable template. 1972 Diag(D.getIdentifierLoc(), diag::err_template_variable) 1973 << II 1974 << SourceRange(TemplateParams->getTemplateLoc(), 1975 TemplateParams->getRAngleLoc()); 1976 return 0; 1977 } else { 1978 // There is an extraneous 'template<>' for this variable. Complain 1979 // about it, but allow the declaration of the variable. 1980 Diag(TemplateParams->getTemplateLoc(), 1981 diag::err_template_variable_noparams) 1982 << II 1983 << SourceRange(TemplateParams->getTemplateLoc(), 1984 TemplateParams->getRAngleLoc()); 1985 } 1986 } 1987 1988 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1989 II, R, SC, 1990 // FIXME: Move to DeclGroup... 1991 D.getDeclSpec().getSourceRange().getBegin()); 1992 1993 if (D.isInvalidType()) 1994 NewVD->setInvalidDecl(); 1995 1996 if (D.getDeclSpec().isThreadSpecified()) { 1997 if (NewVD->hasLocalStorage()) 1998 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 1999 else if (!Context.Target.isTLSSupported()) 2000 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2001 else 2002 NewVD->setThreadSpecified(true); 2003 } 2004 2005 // Set the lexical context. If the declarator has a C++ scope specifier, the 2006 // lexical context will be different from the semantic context. 2007 NewVD->setLexicalDeclContext(CurContext); 2008 2009 // Handle attributes prior to checking for duplicates in MergeVarDecl 2010 ProcessDeclAttributes(S, NewVD, D); 2011 2012 // Handle GNU asm-label extension (encoded as an attribute). 2013 if (Expr *E = (Expr*) D.getAsmLabel()) { 2014 // The parser guarantees this is a string. 2015 StringLiteral *SE = cast<StringLiteral>(E); 2016 NewVD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 2017 SE->getByteLength()))); 2018 } 2019 2020 // If name lookup finds a previous declaration that is not in the 2021 // same scope as the new declaration, this may still be an 2022 // acceptable redeclaration. 2023 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 2024 !(NewVD->hasLinkage() && 2025 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 2026 PrevDecl = 0; 2027 2028 // Merge the decl with the existing one if appropriate. 2029 if (PrevDecl) { 2030 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 2031 // The user tried to define a non-static data member 2032 // out-of-line (C++ [dcl.meaning]p1). 2033 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2034 << D.getCXXScopeSpec().getRange(); 2035 PrevDecl = 0; 2036 NewVD->setInvalidDecl(); 2037 } 2038 } else if (D.getCXXScopeSpec().isSet()) { 2039 // No previous declaration in the qualifying scope. 2040 Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 2041 << Name << D.getCXXScopeSpec().getRange(); 2042 NewVD->setInvalidDecl(); 2043 } 2044 2045 CheckVariableDeclaration(NewVD, PrevDecl, Redeclaration); 2046 2047 // If this is a locally-scoped extern C variable, update the map of 2048 // such variables. 2049 if (CurContext->isFunctionOrMethod() && NewVD->isExternC(Context) && 2050 !NewVD->isInvalidDecl()) 2051 RegisterLocallyScopedExternCDecl(NewVD, PrevDecl, S); 2052 2053 return NewVD; 2054} 2055 2056/// \brief Perform semantic checking on a newly-created variable 2057/// declaration. 2058/// 2059/// This routine performs all of the type-checking required for a 2060/// variable declaration once it has been built. It is used both to 2061/// check variables after they have been parsed and their declarators 2062/// have been translated into a declaration, and to check variables 2063/// that have been instantiated from a template. 2064/// 2065/// Sets NewVD->isInvalidDecl() if an error was encountered. 2066void Sema::CheckVariableDeclaration(VarDecl *NewVD, NamedDecl *PrevDecl, 2067 bool &Redeclaration) { 2068 // If the decl is already known invalid, don't check it. 2069 if (NewVD->isInvalidDecl()) 2070 return; 2071 2072 QualType T = NewVD->getType(); 2073 2074 if (T->isObjCInterfaceType()) { 2075 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2076 return NewVD->setInvalidDecl(); 2077 } 2078 2079 // The variable can not have an abstract class type. 2080 if (RequireNonAbstractType(NewVD->getLocation(), T, 2081 diag::err_abstract_type_in_decl, 2082 AbstractVariableType)) 2083 return NewVD->setInvalidDecl(); 2084 2085 // Emit an error if an address space was applied to decl with local storage. 2086 // This includes arrays of objects with address space qualifiers, but not 2087 // automatic variables that point to other address spaces. 2088 // ISO/IEC TR 18037 S5.1.2 2089 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2090 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2091 return NewVD->setInvalidDecl(); 2092 } 2093 2094 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2095 && !NewVD->hasAttr<BlocksAttr>()) 2096 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2097 2098 bool isVM = T->isVariablyModifiedType(); 2099 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2100 NewVD->hasAttr<BlocksAttr>()) 2101 CurFunctionNeedsScopeChecking = true; 2102 2103 if ((isVM && NewVD->hasLinkage()) || 2104 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2105 bool SizeIsNegative; 2106 QualType FixedTy = 2107 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2108 2109 if (FixedTy.isNull() && T->isVariableArrayType()) { 2110 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2111 // FIXME: This won't give the correct result for 2112 // int a[10][n]; 2113 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2114 2115 if (NewVD->isFileVarDecl()) 2116 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2117 << SizeRange; 2118 else if (NewVD->getStorageClass() == VarDecl::Static) 2119 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2120 << SizeRange; 2121 else 2122 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2123 << SizeRange; 2124 return NewVD->setInvalidDecl(); 2125 } 2126 2127 if (FixedTy.isNull()) { 2128 if (NewVD->isFileVarDecl()) 2129 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2130 else 2131 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2132 return NewVD->setInvalidDecl(); 2133 } 2134 2135 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2136 NewVD->setType(FixedTy); 2137 } 2138 2139 if (!PrevDecl && NewVD->isExternC(Context)) { 2140 // Since we did not find anything by this name and we're declaring 2141 // an extern "C" variable, look for a non-visible extern "C" 2142 // declaration with the same name. 2143 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2144 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2145 if (Pos != LocallyScopedExternalDecls.end()) 2146 PrevDecl = Pos->second; 2147 } 2148 2149 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2150 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2151 << T; 2152 return NewVD->setInvalidDecl(); 2153 } 2154 2155 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2156 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2157 return NewVD->setInvalidDecl(); 2158 } 2159 2160 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2161 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2162 return NewVD->setInvalidDecl(); 2163 } 2164 2165 if (PrevDecl) { 2166 Redeclaration = true; 2167 MergeVarDecl(NewVD, PrevDecl); 2168 } 2169} 2170 2171NamedDecl* 2172Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2173 QualType R, NamedDecl* PrevDecl, 2174 MultiTemplateParamsArg TemplateParamLists, 2175 bool IsFunctionDefinition, bool &Redeclaration) { 2176 assert(R.getTypePtr()->isFunctionType()); 2177 2178 DeclarationName Name = GetNameForDeclarator(D); 2179 FunctionDecl::StorageClass SC = FunctionDecl::None; 2180 switch (D.getDeclSpec().getStorageClassSpec()) { 2181 default: assert(0 && "Unknown storage class!"); 2182 case DeclSpec::SCS_auto: 2183 case DeclSpec::SCS_register: 2184 case DeclSpec::SCS_mutable: 2185 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2186 diag::err_typecheck_sclass_func); 2187 D.setInvalidType(); 2188 break; 2189 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2190 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2191 case DeclSpec::SCS_static: { 2192 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2193 // C99 6.7.1p5: 2194 // The declaration of an identifier for a function that has 2195 // block scope shall have no explicit storage-class specifier 2196 // other than extern 2197 // See also (C++ [dcl.stc]p4). 2198 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2199 diag::err_static_block_func); 2200 SC = FunctionDecl::None; 2201 } else 2202 SC = FunctionDecl::Static; 2203 break; 2204 } 2205 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2206 } 2207 2208 if (D.getDeclSpec().isThreadSpecified()) 2209 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2210 2211 bool isInline = D.getDeclSpec().isInlineSpecified(); 2212 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2213 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2214 2215 // Check that the return type is not an abstract class type. 2216 // For record types, this is done by the AbstractClassUsageDiagnoser once 2217 // the class has been completely parsed. 2218 if (!DC->isRecord() && 2219 RequireNonAbstractType(D.getIdentifierLoc(), 2220 R->getAsFunctionType()->getResultType(), 2221 diag::err_abstract_type_in_decl, 2222 AbstractReturnType)) 2223 D.setInvalidType(); 2224 2225 // Do not allow returning a objc interface by-value. 2226 if (R->getAsFunctionType()->getResultType()->isObjCInterfaceType()) { 2227 Diag(D.getIdentifierLoc(), 2228 diag::err_object_cannot_be_passed_returned_by_value) << 0 2229 << R->getAsFunctionType()->getResultType(); 2230 D.setInvalidType(); 2231 } 2232 2233 // Check that we can declare a template here. 2234 if (TemplateParamLists.size() && 2235 CheckTemplateDeclScope(S, TemplateParamLists)) 2236 return 0; 2237 2238 bool isVirtualOkay = false; 2239 FunctionDecl *NewFD; 2240 if (D.getKind() == Declarator::DK_Constructor) { 2241 // This is a C++ constructor declaration. 2242 assert(DC->isRecord() && 2243 "Constructors can only be declared in a member context"); 2244 2245 R = CheckConstructorDeclarator(D, R, SC); 2246 2247 // Create the new declaration 2248 NewFD = CXXConstructorDecl::Create(Context, 2249 cast<CXXRecordDecl>(DC), 2250 D.getIdentifierLoc(), Name, R, 2251 isExplicit, isInline, 2252 /*isImplicitlyDeclared=*/false); 2253 } else if (D.getKind() == Declarator::DK_Destructor) { 2254 // This is a C++ destructor declaration. 2255 if (DC->isRecord()) { 2256 R = CheckDestructorDeclarator(D, SC); 2257 2258 NewFD = CXXDestructorDecl::Create(Context, 2259 cast<CXXRecordDecl>(DC), 2260 D.getIdentifierLoc(), Name, R, 2261 isInline, 2262 /*isImplicitlyDeclared=*/false); 2263 2264 isVirtualOkay = true; 2265 } else { 2266 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2267 2268 // Create a FunctionDecl to satisfy the function definition parsing 2269 // code path. 2270 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2271 Name, R, SC, isInline, 2272 /*hasPrototype=*/true, 2273 // FIXME: Move to DeclGroup... 2274 D.getDeclSpec().getSourceRange().getBegin()); 2275 D.setInvalidType(); 2276 } 2277 } else if (D.getKind() == Declarator::DK_Conversion) { 2278 if (!DC->isRecord()) { 2279 Diag(D.getIdentifierLoc(), 2280 diag::err_conv_function_not_member); 2281 return 0; 2282 } 2283 2284 CheckConversionDeclarator(D, R, SC); 2285 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2286 D.getIdentifierLoc(), Name, R, 2287 isInline, isExplicit); 2288 2289 isVirtualOkay = true; 2290 } else if (DC->isRecord()) { 2291 // If the of the function is the same as the name of the record, then this 2292 // must be an invalid constructor that has a return type. 2293 // (The parser checks for a return type and makes the declarator a 2294 // constructor if it has no return type). 2295 // must have an invalid constructor that has a return type 2296 if (Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2297 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2298 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2299 << SourceRange(D.getIdentifierLoc()); 2300 return 0; 2301 } 2302 2303 // This is a C++ method declaration. 2304 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2305 D.getIdentifierLoc(), Name, R, 2306 (SC == FunctionDecl::Static), isInline); 2307 2308 isVirtualOkay = (SC != FunctionDecl::Static); 2309 } else { 2310 // Determine whether the function was written with a 2311 // prototype. This true when: 2312 // - we're in C++ (where every function has a prototype), 2313 // - there is a prototype in the declarator, or 2314 // - the type R of the function is some kind of typedef or other reference 2315 // to a type name (which eventually refers to a function type). 2316 bool HasPrototype = 2317 getLangOptions().CPlusPlus || 2318 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2319 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2320 2321 NewFD = FunctionDecl::Create(Context, DC, 2322 D.getIdentifierLoc(), 2323 Name, R, SC, isInline, HasPrototype, 2324 // FIXME: Move to DeclGroup... 2325 D.getDeclSpec().getSourceRange().getBegin()); 2326 } 2327 2328 if (D.isInvalidType()) 2329 NewFD->setInvalidDecl(); 2330 2331 // Set the lexical context. If the declarator has a C++ 2332 // scope specifier, the lexical context will be different 2333 // from the semantic context. 2334 NewFD->setLexicalDeclContext(CurContext); 2335 2336 // Match up the template parameter lists with the scope specifier, then 2337 // determine whether we have a template or a template specialization. 2338 FunctionTemplateDecl *FunctionTemplate = 0; 2339 if (TemplateParameterList *TemplateParams 2340 = MatchTemplateParametersToScopeSpecifier( 2341 D.getDeclSpec().getSourceRange().getBegin(), 2342 D.getCXXScopeSpec(), 2343 (TemplateParameterList**)TemplateParamLists.get(), 2344 TemplateParamLists.size())) { 2345 if (TemplateParams->size() > 0) { 2346 // This is a function template 2347 FunctionTemplate = FunctionTemplateDecl::Create(Context, CurContext, 2348 NewFD->getLocation(), 2349 Name, TemplateParams, 2350 NewFD); 2351 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 2352 } else { 2353 // FIXME: Handle function template specializations 2354 } 2355 2356 // FIXME: Free this memory properly. 2357 TemplateParamLists.release(); 2358 } 2359 2360 // C++ [dcl.fct.spec]p5: 2361 // The virtual specifier shall only be used in declarations of 2362 // nonstatic class member functions that appear within a 2363 // member-specification of a class declaration; see 10.3. 2364 // 2365 if (isVirtual && !NewFD->isInvalidDecl()) { 2366 if (!isVirtualOkay) { 2367 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2368 diag::err_virtual_non_function); 2369 } else if (!CurContext->isRecord()) { 2370 // 'virtual' was specified outside of the class. 2371 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2372 << CodeModificationHint::CreateRemoval( 2373 SourceRange(D.getDeclSpec().getVirtualSpecLoc())); 2374 } else { 2375 // Okay: Add virtual to the method. 2376 cast<CXXMethodDecl>(NewFD)->setVirtualAsWritten(true); 2377 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2378 CurClass->setAggregate(false); 2379 CurClass->setPOD(false); 2380 CurClass->setPolymorphic(true); 2381 CurClass->setHasTrivialConstructor(false); 2382 CurClass->setHasTrivialCopyConstructor(false); 2383 CurClass->setHasTrivialCopyAssignment(false); 2384 } 2385 } 2386 2387 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) { 2388 // Look for virtual methods in base classes that this method might override. 2389 2390 BasePaths Paths; 2391 if (LookupInBases(cast<CXXRecordDecl>(DC), 2392 MemberLookupCriteria(NewMD), Paths)) { 2393 for (BasePaths::decl_iterator I = Paths.found_decls_begin(), 2394 E = Paths.found_decls_end(); I != E; ++I) { 2395 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2396 if (!CheckOverridingFunctionReturnType(NewMD, OldMD) && 2397 !CheckOverridingFunctionExceptionSpec(NewMD, OldMD)) 2398 NewMD->addOverriddenMethod(OldMD); 2399 } 2400 } 2401 } 2402 } 2403 2404 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 2405 !CurContext->isRecord()) { 2406 // C++ [class.static]p1: 2407 // A data or function member of a class may be declared static 2408 // in a class definition, in which case it is a static member of 2409 // the class. 2410 2411 // Complain about the 'static' specifier if it's on an out-of-line 2412 // member function definition. 2413 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2414 diag::err_static_out_of_line) 2415 << CodeModificationHint::CreateRemoval( 2416 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 2417 } 2418 2419 // Handle GNU asm-label extension (encoded as an attribute). 2420 if (Expr *E = (Expr*) D.getAsmLabel()) { 2421 // The parser guarantees this is a string. 2422 StringLiteral *SE = cast<StringLiteral>(E); 2423 NewFD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 2424 SE->getByteLength()))); 2425 } 2426 2427 // Copy the parameter declarations from the declarator D to the function 2428 // declaration NewFD, if they are available. First scavenge them into Params. 2429 llvm::SmallVector<ParmVarDecl*, 16> Params; 2430 if (D.getNumTypeObjects() > 0) { 2431 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2432 2433 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 2434 // function that takes no arguments, not a function that takes a 2435 // single void argument. 2436 // We let through "const void" here because Sema::GetTypeForDeclarator 2437 // already checks for that case. 2438 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2439 FTI.ArgInfo[0].Param && 2440 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 2441 // Empty arg list, don't push any params. 2442 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 2443 2444 // In C++, the empty parameter-type-list must be spelled "void"; a 2445 // typedef of void is not permitted. 2446 if (getLangOptions().CPlusPlus && 2447 Param->getType().getUnqualifiedType() != Context.VoidTy) 2448 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 2449 // FIXME: Leaks decl? 2450 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 2451 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2452 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 2453 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 2454 Param->setDeclContext(NewFD); 2455 Params.push_back(Param); 2456 } 2457 } 2458 2459 } else if (const FunctionProtoType *FT = R->getAsFunctionProtoType()) { 2460 // When we're declaring a function with a typedef, typeof, etc as in the 2461 // following example, we'll need to synthesize (unnamed) 2462 // parameters for use in the declaration. 2463 // 2464 // @code 2465 // typedef void fn(int); 2466 // fn f; 2467 // @endcode 2468 2469 // Synthesize a parameter for each argument type. 2470 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 2471 AE = FT->arg_type_end(); AI != AE; ++AI) { 2472 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, 2473 SourceLocation(), 0, 2474 *AI, VarDecl::None, 0); 2475 Param->setImplicit(); 2476 Params.push_back(Param); 2477 } 2478 } else { 2479 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 2480 "Should not need args for typedef of non-prototype fn"); 2481 } 2482 // Finally, we know we have the right number of parameters, install them. 2483 NewFD->setParams(Context, Params.data(), Params.size()); 2484 2485 // If name lookup finds a previous declaration that is not in the 2486 // same scope as the new declaration, this may still be an 2487 // acceptable redeclaration. 2488 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 2489 !(NewFD->hasLinkage() && 2490 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 2491 PrevDecl = 0; 2492 2493 // Perform semantic checking on the function declaration. 2494 bool OverloadableAttrRequired = false; // FIXME: HACK! 2495 CheckFunctionDeclaration(NewFD, PrevDecl, Redeclaration, 2496 /*FIXME:*/OverloadableAttrRequired); 2497 2498 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 2499 // An out-of-line member function declaration must also be a 2500 // definition (C++ [dcl.meaning]p1). 2501 if (!IsFunctionDefinition) { 2502 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2503 << D.getCXXScopeSpec().getRange(); 2504 NewFD->setInvalidDecl(); 2505 } else if (!Redeclaration && (!PrevDecl || !isa<UsingDecl>(PrevDecl))) { 2506 // The user tried to provide an out-of-line definition for a 2507 // function that is a member of a class or namespace, but there 2508 // was no such member function declared (C++ [class.mfct]p2, 2509 // C++ [namespace.memdef]p2). For example: 2510 // 2511 // class X { 2512 // void f() const; 2513 // }; 2514 // 2515 // void X::f() { } // ill-formed 2516 // 2517 // Complain about this problem, and attempt to suggest close 2518 // matches (e.g., those that differ only in cv-qualifiers and 2519 // whether the parameter types are references). 2520 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 2521 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 2522 NewFD->setInvalidDecl(); 2523 2524 LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 2525 true); 2526 assert(!Prev.isAmbiguous() && 2527 "Cannot have an ambiguity in previous-declaration lookup"); 2528 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 2529 Func != FuncEnd; ++Func) { 2530 if (isa<FunctionDecl>(*Func) && 2531 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 2532 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 2533 } 2534 2535 PrevDecl = 0; 2536 } 2537 } 2538 2539 // Handle attributes. We need to have merged decls when handling attributes 2540 // (for example to check for conflicts, etc). 2541 // FIXME: This needs to happen before we merge declarations. Then, 2542 // let attribute merging cope with attribute conflicts. 2543 ProcessDeclAttributes(S, NewFD, D); 2544 AddKnownFunctionAttributes(NewFD); 2545 2546 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 2547 // If a function name is overloadable in C, then every function 2548 // with that name must be marked "overloadable". 2549 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 2550 << Redeclaration << NewFD; 2551 if (PrevDecl) 2552 Diag(PrevDecl->getLocation(), 2553 diag::note_attribute_overloadable_prev_overload); 2554 NewFD->addAttr(::new (Context) OverloadableAttr()); 2555 } 2556 2557 // If this is a locally-scoped extern C function, update the 2558 // map of such names. 2559 if (CurContext->isFunctionOrMethod() && NewFD->isExternC(Context) 2560 && !NewFD->isInvalidDecl()) 2561 RegisterLocallyScopedExternCDecl(NewFD, PrevDecl, S); 2562 2563 // Set this FunctionDecl's range up to the right paren. 2564 NewFD->setLocEnd(D.getSourceRange().getEnd()); 2565 2566 if (FunctionTemplate && NewFD->isInvalidDecl()) 2567 FunctionTemplate->setInvalidDecl(); 2568 2569 if (FunctionTemplate) 2570 return FunctionTemplate; 2571 2572 return NewFD; 2573} 2574 2575/// \brief Perform semantic checking of a new function declaration. 2576/// 2577/// Performs semantic analysis of the new function declaration 2578/// NewFD. This routine performs all semantic checking that does not 2579/// require the actual declarator involved in the declaration, and is 2580/// used both for the declaration of functions as they are parsed 2581/// (called via ActOnDeclarator) and for the declaration of functions 2582/// that have been instantiated via C++ template instantiation (called 2583/// via InstantiateDecl). 2584/// 2585/// This sets NewFD->isInvalidDecl() to true if there was an error. 2586void Sema::CheckFunctionDeclaration(FunctionDecl *NewFD, NamedDecl *&PrevDecl, 2587 bool &Redeclaration, 2588 bool &OverloadableAttrRequired) { 2589 // If NewFD is already known erroneous, don't do any of this checking. 2590 if (NewFD->isInvalidDecl()) 2591 return; 2592 2593 if (NewFD->getResultType()->isVariablyModifiedType()) { 2594 // Functions returning a variably modified type violate C99 6.7.5.2p2 2595 // because all functions have linkage. 2596 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 2597 return NewFD->setInvalidDecl(); 2598 } 2599 2600 // Semantic checking for this function declaration (in isolation). 2601 if (getLangOptions().CPlusPlus) { 2602 // C++-specific checks. 2603 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 2604 CheckConstructor(Constructor); 2605 } else if (isa<CXXDestructorDecl>(NewFD)) { 2606 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 2607 QualType ClassType = Context.getTypeDeclType(Record); 2608 if (!ClassType->isDependentType()) { 2609 ClassType = Context.getCanonicalType(ClassType); 2610 DeclarationName Name 2611 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2612 if (NewFD->getDeclName() != Name) { 2613 Diag(NewFD->getLocation(), diag::err_destructor_name); 2614 return NewFD->setInvalidDecl(); 2615 } 2616 } 2617 Record->setUserDeclaredDestructor(true); 2618 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 2619 // user-defined destructor. 2620 Record->setPOD(false); 2621 2622 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 2623 // declared destructor. 2624 // FIXME: C++0x: don't do this for "= default" destructors 2625 Record->setHasTrivialDestructor(false); 2626 } else if (CXXConversionDecl *Conversion 2627 = dyn_cast<CXXConversionDecl>(NewFD)) 2628 ActOnConversionDeclarator(Conversion); 2629 2630 // Extra checking for C++ overloaded operators (C++ [over.oper]). 2631 if (NewFD->isOverloadedOperator() && 2632 CheckOverloadedOperatorDeclaration(NewFD)) 2633 return NewFD->setInvalidDecl(); 2634 } 2635 2636 // C99 6.7.4p6: 2637 // [... ] For a function with external linkage, the following 2638 // restrictions apply: [...] If all of the file scope declarations 2639 // for a function in a translation unit include the inline 2640 // function specifier without extern, then the definition in that 2641 // translation unit is an inline definition. An inline definition 2642 // does not provide an external definition for the function, and 2643 // does not forbid an external definition in another translation 2644 // unit. 2645 // 2646 // Here we determine whether this function, in isolation, would be a 2647 // C99 inline definition. MergeCompatibleFunctionDecls looks at 2648 // previous declarations. 2649 if (NewFD->isInline() && getLangOptions().C99 && 2650 NewFD->getStorageClass() == FunctionDecl::None && 2651 NewFD->getDeclContext()->getLookupContext()->isTranslationUnit()) 2652 NewFD->setC99InlineDefinition(true); 2653 2654 // Check for a previous declaration of this name. 2655 if (!PrevDecl && NewFD->isExternC(Context)) { 2656 // Since we did not find anything by this name and we're declaring 2657 // an extern "C" function, look for a non-visible extern "C" 2658 // declaration with the same name. 2659 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2660 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 2661 if (Pos != LocallyScopedExternalDecls.end()) 2662 PrevDecl = Pos->second; 2663 } 2664 2665 // Merge or overload the declaration with an existing declaration of 2666 // the same name, if appropriate. 2667 if (PrevDecl) { 2668 // Determine whether NewFD is an overload of PrevDecl or 2669 // a declaration that requires merging. If it's an overload, 2670 // there's no more work to do here; we'll just add the new 2671 // function to the scope. 2672 OverloadedFunctionDecl::function_iterator MatchedDecl; 2673 2674 if (!getLangOptions().CPlusPlus && 2675 AllowOverloadingOfFunction(PrevDecl, Context)) { 2676 OverloadableAttrRequired = true; 2677 2678 // Functions marked "overloadable" must have a prototype (that 2679 // we can't get through declaration merging). 2680 if (!NewFD->getType()->getAsFunctionProtoType()) { 2681 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_no_prototype) 2682 << NewFD; 2683 Redeclaration = true; 2684 2685 // Turn this into a variadic function with no parameters. 2686 QualType R = Context.getFunctionType( 2687 NewFD->getType()->getAsFunctionType()->getResultType(), 2688 0, 0, true, 0); 2689 NewFD->setType(R); 2690 return NewFD->setInvalidDecl(); 2691 } 2692 } 2693 2694 if (PrevDecl && 2695 (!AllowOverloadingOfFunction(PrevDecl, Context) || 2696 !IsOverload(NewFD, PrevDecl, MatchedDecl)) && 2697 !isa<UsingDecl>(PrevDecl)) { 2698 Redeclaration = true; 2699 Decl *OldDecl = PrevDecl; 2700 2701 // If PrevDecl was an overloaded function, extract the 2702 // FunctionDecl that matched. 2703 if (isa<OverloadedFunctionDecl>(PrevDecl)) 2704 OldDecl = *MatchedDecl; 2705 2706 // NewFD and OldDecl represent declarations that need to be 2707 // merged. 2708 if (MergeFunctionDecl(NewFD, OldDecl)) 2709 return NewFD->setInvalidDecl(); 2710 2711 if (FunctionTemplateDecl *OldTemplateDecl 2712 = dyn_cast<FunctionTemplateDecl>(OldDecl)) 2713 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 2714 else { 2715 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 2716 NewFD->setAccess(OldDecl->getAccess()); 2717 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 2718 } 2719 } 2720 } 2721 2722 // In C++, check default arguments now that we have merged decls. Unless 2723 // the lexical context is the class, because in this case this is done 2724 // during delayed parsing anyway. 2725 if (getLangOptions().CPlusPlus && !CurContext->isRecord()) 2726 CheckCXXDefaultArguments(NewFD); 2727} 2728 2729bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 2730 // FIXME: Need strict checking. In C89, we need to check for 2731 // any assignment, increment, decrement, function-calls, or 2732 // commas outside of a sizeof. In C99, it's the same list, 2733 // except that the aforementioned are allowed in unevaluated 2734 // expressions. Everything else falls under the 2735 // "may accept other forms of constant expressions" exception. 2736 // (We never end up here for C++, so the constant expression 2737 // rules there don't matter.) 2738 if (Init->isConstantInitializer(Context)) 2739 return false; 2740 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 2741 << Init->getSourceRange(); 2742 return true; 2743} 2744 2745void Sema::AddInitializerToDecl(DeclPtrTy dcl, FullExprArg init) { 2746 AddInitializerToDecl(dcl, init.release(), /*DirectInit=*/false); 2747} 2748 2749/// AddInitializerToDecl - Adds the initializer Init to the 2750/// declaration dcl. If DirectInit is true, this is C++ direct 2751/// initialization rather than copy initialization. 2752void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 2753 Decl *RealDecl = dcl.getAs<Decl>(); 2754 // If there is no declaration, there was an error parsing it. Just ignore 2755 // the initializer. 2756 if (RealDecl == 0) 2757 return; 2758 2759 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 2760 // With declarators parsed the way they are, the parser cannot 2761 // distinguish between a normal initializer and a pure-specifier. 2762 // Thus this grotesque test. 2763 IntegerLiteral *IL; 2764 Expr *Init = static_cast<Expr *>(init.get()); 2765 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 2766 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 2767 if (Method->isVirtualAsWritten()) { 2768 Method->setPure(); 2769 2770 // A class is abstract if at least one function is pure virtual. 2771 cast<CXXRecordDecl>(CurContext)->setAbstract(true); 2772 } else if (!Method->isInvalidDecl()) { 2773 Diag(Method->getLocation(), diag::err_non_virtual_pure) 2774 << Method->getDeclName() << Init->getSourceRange(); 2775 Method->setInvalidDecl(); 2776 } 2777 } else { 2778 Diag(Method->getLocation(), diag::err_member_function_initialization) 2779 << Method->getDeclName() << Init->getSourceRange(); 2780 Method->setInvalidDecl(); 2781 } 2782 return; 2783 } 2784 2785 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2786 if (!VDecl) { 2787 if (getLangOptions().CPlusPlus && 2788 RealDecl->getLexicalDeclContext()->isRecord() && 2789 isa<NamedDecl>(RealDecl)) 2790 Diag(RealDecl->getLocation(), diag::err_member_initialization) 2791 << cast<NamedDecl>(RealDecl)->getDeclName(); 2792 else 2793 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2794 RealDecl->setInvalidDecl(); 2795 return; 2796 } 2797 2798 if (!VDecl->getType()->isArrayType() && 2799 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2800 diag::err_typecheck_decl_incomplete_type)) { 2801 RealDecl->setInvalidDecl(); 2802 return; 2803 } 2804 2805 const VarDecl *Def = 0; 2806 if (VDecl->getDefinition(Def)) { 2807 Diag(VDecl->getLocation(), diag::err_redefinition) 2808 << VDecl->getDeclName(); 2809 Diag(Def->getLocation(), diag::note_previous_definition); 2810 VDecl->setInvalidDecl(); 2811 return; 2812 } 2813 2814 // Take ownership of the expression, now that we're sure we have somewhere 2815 // to put it. 2816 Expr *Init = init.takeAs<Expr>(); 2817 assert(Init && "missing initializer"); 2818 2819 // Get the decls type and save a reference for later, since 2820 // CheckInitializerTypes may change it. 2821 QualType DclT = VDecl->getType(), SavT = DclT; 2822 if (VDecl->isBlockVarDecl()) { 2823 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 2824 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2825 VDecl->setInvalidDecl(); 2826 } else if (!VDecl->isInvalidDecl()) { 2827 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2828 VDecl->getDeclName(), DirectInit)) 2829 VDecl->setInvalidDecl(); 2830 2831 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2832 // Don't check invalid declarations to avoid emitting useless diagnostics. 2833 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2834 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 2835 CheckForConstantInitializer(Init, DclT); 2836 } 2837 } 2838 } else if (VDecl->isStaticDataMember() && 2839 VDecl->getLexicalDeclContext()->isRecord()) { 2840 // This is an in-class initialization for a static data member, e.g., 2841 // 2842 // struct S { 2843 // static const int value = 17; 2844 // }; 2845 2846 // Attach the initializer 2847 VDecl->setInit(Context, Init); 2848 2849 // C++ [class.mem]p4: 2850 // A member-declarator can contain a constant-initializer only 2851 // if it declares a static member (9.4) of const integral or 2852 // const enumeration type, see 9.4.2. 2853 QualType T = VDecl->getType(); 2854 if (!T->isDependentType() && 2855 (!Context.getCanonicalType(T).isConstQualified() || 2856 !T->isIntegralType())) { 2857 Diag(VDecl->getLocation(), diag::err_member_initialization) 2858 << VDecl->getDeclName() << Init->getSourceRange(); 2859 VDecl->setInvalidDecl(); 2860 } else { 2861 // C++ [class.static.data]p4: 2862 // If a static data member is of const integral or const 2863 // enumeration type, its declaration in the class definition 2864 // can specify a constant-initializer which shall be an 2865 // integral constant expression (5.19). 2866 if (!Init->isTypeDependent() && 2867 !Init->getType()->isIntegralType()) { 2868 // We have a non-dependent, non-integral or enumeration type. 2869 Diag(Init->getSourceRange().getBegin(), 2870 diag::err_in_class_initializer_non_integral_type) 2871 << Init->getType() << Init->getSourceRange(); 2872 VDecl->setInvalidDecl(); 2873 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 2874 // Check whether the expression is a constant expression. 2875 llvm::APSInt Value; 2876 SourceLocation Loc; 2877 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 2878 Diag(Loc, diag::err_in_class_initializer_non_constant) 2879 << Init->getSourceRange(); 2880 VDecl->setInvalidDecl(); 2881 } else if (!VDecl->getType()->isDependentType()) 2882 ImpCastExprToType(Init, VDecl->getType()); 2883 } 2884 } 2885 } else if (VDecl->isFileVarDecl()) { 2886 if (VDecl->getStorageClass() == VarDecl::Extern) 2887 Diag(VDecl->getLocation(), diag::warn_extern_init); 2888 if (!VDecl->isInvalidDecl()) 2889 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2890 VDecl->getDeclName(), DirectInit)) 2891 VDecl->setInvalidDecl(); 2892 2893 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2894 // Don't check invalid declarations to avoid emitting useless diagnostics. 2895 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2896 // C99 6.7.8p4. All file scoped initializers need to be constant. 2897 CheckForConstantInitializer(Init, DclT); 2898 } 2899 } 2900 // If the type changed, it means we had an incomplete type that was 2901 // completed by the initializer. For example: 2902 // int ary[] = { 1, 3, 5 }; 2903 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2904 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2905 VDecl->setType(DclT); 2906 Init->setType(DclT); 2907 } 2908 2909 // Attach the initializer to the decl. 2910 VDecl->setInit(Context, Init); 2911 2912 // If the previous declaration of VDecl was a tentative definition, 2913 // remove it from the set of tentative definitions. 2914 if (VDecl->getPreviousDeclaration() && 2915 VDecl->getPreviousDeclaration()->isTentativeDefinition(Context)) { 2916 llvm::DenseMap<DeclarationName, VarDecl *>::iterator Pos 2917 = TentativeDefinitions.find(VDecl->getDeclName()); 2918 assert(Pos != TentativeDefinitions.end() && 2919 "Unrecorded tentative definition?"); 2920 TentativeDefinitions.erase(Pos); 2921 } 2922 2923 return; 2924} 2925 2926void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 2927 bool TypeContainsUndeducedAuto) { 2928 Decl *RealDecl = dcl.getAs<Decl>(); 2929 2930 // If there is no declaration, there was an error parsing it. Just ignore it. 2931 if (RealDecl == 0) 2932 return; 2933 2934 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2935 QualType Type = Var->getType(); 2936 2937 // Record tentative definitions. 2938 if (Var->isTentativeDefinition(Context)) 2939 TentativeDefinitions[Var->getDeclName()] = Var; 2940 2941 // C++ [dcl.init.ref]p3: 2942 // The initializer can be omitted for a reference only in a 2943 // parameter declaration (8.3.5), in the declaration of a 2944 // function return type, in the declaration of a class member 2945 // within its class declaration (9.2), and where the extern 2946 // specifier is explicitly used. 2947 if (Type->isReferenceType() && !Var->hasExternalStorage()) { 2948 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2949 << Var->getDeclName() 2950 << SourceRange(Var->getLocation(), Var->getLocation()); 2951 Var->setInvalidDecl(); 2952 return; 2953 } 2954 2955 // C++0x [dcl.spec.auto]p3 2956 if (TypeContainsUndeducedAuto) { 2957 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 2958 << Var->getDeclName() << Type; 2959 Var->setInvalidDecl(); 2960 return; 2961 } 2962 2963 // C++ [dcl.init]p9: 2964 // 2965 // If no initializer is specified for an object, and the object 2966 // is of (possibly cv-qualified) non-POD class type (or array 2967 // thereof), the object shall be default-initialized; if the 2968 // object is of const-qualified type, the underlying class type 2969 // shall have a user-declared default constructor. 2970 if (getLangOptions().CPlusPlus) { 2971 QualType InitType = Type; 2972 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2973 InitType = Array->getElementType(); 2974 if ((!Var->hasExternalStorage() && !Var->isExternC(Context)) && 2975 InitType->isRecordType() && !InitType->isDependentType()) { 2976 CXXRecordDecl *RD = 2977 cast<CXXRecordDecl>(InitType->getAsRecordType()->getDecl()); 2978 CXXConstructorDecl *Constructor = 0; 2979 if (!RequireCompleteType(Var->getLocation(), InitType, 2980 diag::err_invalid_incomplete_type_use)) 2981 Constructor 2982 = PerformInitializationByConstructor(InitType, 0, 0, 2983 Var->getLocation(), 2984 SourceRange(Var->getLocation(), 2985 Var->getLocation()), 2986 Var->getDeclName(), 2987 IK_Default); 2988 if (!Constructor) 2989 Var->setInvalidDecl(); 2990 else { 2991 if (!RD->hasTrivialConstructor()) 2992 InitializeVarWithConstructor(Var, Constructor, InitType, 0, 0); 2993 // FIXME. Must do all that is needed to destroy the object 2994 // on scope exit. For now, just mark the destructor as used. 2995 MarkDestructorReferenced(Var->getLocation(), InitType); 2996 } 2997 } 2998 } 2999 3000#if 0 3001 // FIXME: Temporarily disabled because we are not properly parsing 3002 // linkage specifications on declarations, e.g., 3003 // 3004 // extern "C" const CGPoint CGPointerZero; 3005 // 3006 // C++ [dcl.init]p9: 3007 // 3008 // If no initializer is specified for an object, and the 3009 // object is of (possibly cv-qualified) non-POD class type (or 3010 // array thereof), the object shall be default-initialized; if 3011 // the object is of const-qualified type, the underlying class 3012 // type shall have a user-declared default 3013 // constructor. Otherwise, if no initializer is specified for 3014 // an object, the object and its subobjects, if any, have an 3015 // indeterminate initial value; if the object or any of its 3016 // subobjects are of const-qualified type, the program is 3017 // ill-formed. 3018 // 3019 // This isn't technically an error in C, so we don't diagnose it. 3020 // 3021 // FIXME: Actually perform the POD/user-defined default 3022 // constructor check. 3023 if (getLangOptions().CPlusPlus && 3024 Context.getCanonicalType(Type).isConstQualified() && 3025 !Var->hasExternalStorage()) 3026 Diag(Var->getLocation(), diag::err_const_var_requires_init) 3027 << Var->getName() 3028 << SourceRange(Var->getLocation(), Var->getLocation()); 3029#endif 3030 } 3031} 3032 3033Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 3034 DeclPtrTy *Group, 3035 unsigned NumDecls) { 3036 llvm::SmallVector<Decl*, 8> Decls; 3037 3038 if (DS.isTypeSpecOwned()) 3039 Decls.push_back((Decl*)DS.getTypeRep()); 3040 3041 for (unsigned i = 0; i != NumDecls; ++i) 3042 if (Decl *D = Group[i].getAs<Decl>()) 3043 Decls.push_back(D); 3044 3045 // Perform semantic analysis that depends on having fully processed both 3046 // the declarator and initializer. 3047 for (unsigned i = 0, e = Decls.size(); i != e; ++i) { 3048 VarDecl *IDecl = dyn_cast<VarDecl>(Decls[i]); 3049 if (!IDecl) 3050 continue; 3051 QualType T = IDecl->getType(); 3052 3053 // Block scope. C99 6.7p7: If an identifier for an object is declared with 3054 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 3055 if (IDecl->isBlockVarDecl() && !IDecl->hasExternalStorage()) { 3056 if (!IDecl->isInvalidDecl() && 3057 RequireCompleteType(IDecl->getLocation(), T, 3058 diag::err_typecheck_decl_incomplete_type)) 3059 IDecl->setInvalidDecl(); 3060 } 3061 // File scope. C99 6.9.2p2: A declaration of an identifier for an 3062 // object that has file scope without an initializer, and without a 3063 // storage-class specifier or with the storage-class specifier "static", 3064 // constitutes a tentative definition. Note: A tentative definition with 3065 // external linkage is valid (C99 6.2.2p5). 3066 if (IDecl->isTentativeDefinition(Context) && !IDecl->isInvalidDecl()) { 3067 if (const IncompleteArrayType *ArrayT 3068 = Context.getAsIncompleteArrayType(T)) { 3069 if (RequireCompleteType(IDecl->getLocation(), 3070 ArrayT->getElementType(), 3071 diag::err_illegal_decl_array_incomplete_type)) 3072 IDecl->setInvalidDecl(); 3073 } 3074 else if (IDecl->getStorageClass() == VarDecl::Static) { 3075 // C99 6.9.2p3: If the declaration of an identifier for an object is 3076 // a tentative definition and has internal linkage (C99 6.2.2p3), the 3077 // declared type shall not be an incomplete type. 3078 // NOTE: code such as the following 3079 // static struct s; 3080 // struct s { int a; }; 3081 // is accepted by gcc. Hence here we issue a warning instead of 3082 // an error and we do not invalidate the static declaration. 3083 // NOTE: to avoid multiple warnings, only check the first declaration. 3084 if (IDecl->getPreviousDeclaration() == 0) 3085 RequireCompleteType(IDecl->getLocation(), T, 3086 diag::ext_typecheck_decl_incomplete_type); 3087 } 3088 } 3089 } 3090 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 3091 Decls.data(), Decls.size())); 3092} 3093 3094 3095/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 3096/// to introduce parameters into function prototype scope. 3097Sema::DeclPtrTy 3098Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 3099 const DeclSpec &DS = D.getDeclSpec(); 3100 3101 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 3102 VarDecl::StorageClass StorageClass = VarDecl::None; 3103 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 3104 StorageClass = VarDecl::Register; 3105 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 3106 Diag(DS.getStorageClassSpecLoc(), 3107 diag::err_invalid_storage_class_in_func_decl); 3108 D.getMutableDeclSpec().ClearStorageClassSpecs(); 3109 } 3110 3111 if (D.getDeclSpec().isThreadSpecified()) 3112 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3113 3114 DiagnoseFunctionSpecifiers(D); 3115 3116 // Check that there are no default arguments inside the type of this 3117 // parameter (C++ only). 3118 if (getLangOptions().CPlusPlus) 3119 CheckExtraCXXDefaultArguments(D); 3120 3121 TagDecl *OwnedDecl = 0; 3122 QualType parmDeclType = GetTypeForDeclarator(D, S, /*Skip=*/0, &OwnedDecl); 3123 3124 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 3125 // C++ [dcl.fct]p6: 3126 // Types shall not be defined in return or parameter types. 3127 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 3128 << Context.getTypeDeclType(OwnedDecl); 3129 } 3130 3131 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 3132 // Can this happen for params? We already checked that they don't conflict 3133 // among each other. Here they can only shadow globals, which is ok. 3134 IdentifierInfo *II = D.getIdentifier(); 3135 if (II) { 3136 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3137 if (PrevDecl->isTemplateParameter()) { 3138 // Maybe we will complain about the shadowed template parameter. 3139 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3140 // Just pretend that we didn't see the previous declaration. 3141 PrevDecl = 0; 3142 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 3143 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 3144 3145 // Recover by removing the name 3146 II = 0; 3147 D.SetIdentifier(0, D.getIdentifierLoc()); 3148 } 3149 } 3150 } 3151 3152 // Parameters can not be abstract class types. 3153 // For record types, this is done by the AbstractClassUsageDiagnoser once 3154 // the class has been completely parsed. 3155 if (!CurContext->isRecord() && 3156 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 3157 diag::err_abstract_type_in_decl, 3158 AbstractParamType)) 3159 D.setInvalidType(true); 3160 3161 QualType T = adjustParameterType(parmDeclType); 3162 3163 ParmVarDecl *New; 3164 if (T == parmDeclType) // parameter type did not need adjustment 3165 New = ParmVarDecl::Create(Context, CurContext, 3166 D.getIdentifierLoc(), II, 3167 parmDeclType, StorageClass, 3168 0); 3169 else // keep track of both the adjusted and unadjusted types 3170 New = OriginalParmVarDecl::Create(Context, CurContext, 3171 D.getIdentifierLoc(), II, T, 3172 parmDeclType, StorageClass, 0); 3173 3174 if (D.isInvalidType()) 3175 New->setInvalidDecl(); 3176 3177 // Parameter declarators cannot be interface types. All ObjC objects are 3178 // passed by reference. 3179 if (T->isObjCInterfaceType()) { 3180 Diag(D.getIdentifierLoc(), 3181 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 3182 New->setInvalidDecl(); 3183 } 3184 3185 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 3186 if (D.getCXXScopeSpec().isSet()) { 3187 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 3188 << D.getCXXScopeSpec().getRange(); 3189 New->setInvalidDecl(); 3190 } 3191 3192 // Add the parameter declaration into this scope. 3193 S->AddDecl(DeclPtrTy::make(New)); 3194 if (II) 3195 IdResolver.AddDecl(New); 3196 3197 ProcessDeclAttributes(S, New, D); 3198 3199 if (New->hasAttr<BlocksAttr>()) { 3200 Diag(New->getLocation(), diag::err_block_on_nonlocal); 3201 } 3202 return DeclPtrTy::make(New); 3203} 3204 3205void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 3206 SourceLocation LocAfterDecls) { 3207 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3208 "Not a function declarator!"); 3209 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3210 3211 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 3212 // for a K&R function. 3213 if (!FTI.hasPrototype) { 3214 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 3215 --i; 3216 if (FTI.ArgInfo[i].Param == 0) { 3217 std::string Code = " int "; 3218 Code += FTI.ArgInfo[i].Ident->getName(); 3219 Code += ";\n"; 3220 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 3221 << FTI.ArgInfo[i].Ident 3222 << CodeModificationHint::CreateInsertion(LocAfterDecls, Code); 3223 3224 // Implicitly declare the argument as type 'int' for lack of a better 3225 // type. 3226 DeclSpec DS; 3227 const char* PrevSpec; // unused 3228 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 3229 PrevSpec); 3230 Declarator ParamD(DS, Declarator::KNRTypeListContext); 3231 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 3232 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 3233 } 3234 } 3235 } 3236} 3237 3238Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 3239 Declarator &D) { 3240 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 3241 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3242 "Not a function declarator!"); 3243 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3244 3245 if (FTI.hasPrototype) { 3246 // FIXME: Diagnose arguments without names in C. 3247 } 3248 3249 Scope *ParentScope = FnBodyScope->getParent(); 3250 3251 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 3252 MultiTemplateParamsArg(*this), 3253 /*IsFunctionDefinition=*/true); 3254 return ActOnStartOfFunctionDef(FnBodyScope, DP); 3255} 3256 3257Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 3258 if (!D) 3259 return D; 3260 FunctionDecl *FD = cast<FunctionDecl>(D.getAs<Decl>()); 3261 3262 CurFunctionNeedsScopeChecking = false; 3263 3264 // See if this is a redefinition. 3265 const FunctionDecl *Definition; 3266 if (FD->getBody(Definition)) { 3267 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 3268 Diag(Definition->getLocation(), diag::note_previous_definition); 3269 } 3270 3271 // Builtin functions cannot be defined. 3272 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 3273 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 3274 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 3275 FD->setInvalidDecl(); 3276 } 3277 } 3278 3279 // The return type of a function definition must be complete 3280 // (C99 6.9.1p3, C++ [dcl.fct]p6). 3281 QualType ResultType = FD->getResultType(); 3282 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 3283 !FD->isInvalidDecl() && 3284 RequireCompleteType(FD->getLocation(), ResultType, 3285 diag::err_func_def_incomplete_result)) 3286 FD->setInvalidDecl(); 3287 3288 // GNU warning -Wmissing-prototypes: 3289 // Warn if a global function is defined without a previous 3290 // prototype declaration. This warning is issued even if the 3291 // definition itself provides a prototype. The aim is to detect 3292 // global functions that fail to be declared in header files. 3293 if (!FD->isInvalidDecl() && FD->isGlobal() && !isa<CXXMethodDecl>(FD) && 3294 !FD->isMain()) { 3295 bool MissingPrototype = true; 3296 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 3297 Prev; Prev = Prev->getPreviousDeclaration()) { 3298 // Ignore any declarations that occur in function or method 3299 // scope, because they aren't visible from the header. 3300 if (Prev->getDeclContext()->isFunctionOrMethod()) 3301 continue; 3302 3303 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 3304 break; 3305 } 3306 3307 if (MissingPrototype) 3308 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 3309 } 3310 3311 if (FnBodyScope) 3312 PushDeclContext(FnBodyScope, FD); 3313 3314 // Check the validity of our function parameters 3315 CheckParmsForFunctionDef(FD); 3316 3317 // Introduce our parameters into the function scope 3318 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 3319 ParmVarDecl *Param = FD->getParamDecl(p); 3320 Param->setOwningFunction(FD); 3321 3322 // If this has an identifier, add it to the scope stack. 3323 if (Param->getIdentifier() && FnBodyScope) 3324 PushOnScopeChains(Param, FnBodyScope); 3325 } 3326 3327 // Checking attributes of current function definition 3328 // dllimport attribute. 3329 if (FD->getAttr<DLLImportAttr>() && 3330 (!FD->getAttr<DLLExportAttr>())) { 3331 // dllimport attribute cannot be applied to definition. 3332 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 3333 Diag(FD->getLocation(), 3334 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 3335 << "dllimport"; 3336 FD->setInvalidDecl(); 3337 return DeclPtrTy::make(FD); 3338 } else { 3339 // If a symbol previously declared dllimport is later defined, the 3340 // attribute is ignored in subsequent references, and a warning is 3341 // emitted. 3342 Diag(FD->getLocation(), 3343 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 3344 << FD->getNameAsCString() << "dllimport"; 3345 } 3346 } 3347 return DeclPtrTy::make(FD); 3348} 3349 3350Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 3351 return ActOnFinishFunctionBody(D, move(BodyArg), false); 3352} 3353 3354Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 3355 bool IsInstantiation) { 3356 Decl *dcl = D.getAs<Decl>(); 3357 Stmt *Body = BodyArg.takeAs<Stmt>(); 3358 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 3359 FD->setBody(Body); 3360 if (!FD->getResultType()->isVoidType() 3361 // C and C++ allow for main to automagically return 0. 3362 && !FD->isMain()) 3363 CheckFallThroughForFunctionDef(FD, Body); 3364 3365 if (!FD->isInvalidDecl()) 3366 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 3367 3368 // C++ [basic.def.odr]p2: 3369 // [...] A virtual member function is used if it is not pure. [...] 3370 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 3371 if (Method->isVirtual() && !Method->isPure()) 3372 MarkDeclarationReferenced(Method->getLocation(), Method); 3373 3374 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 3375 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 3376 assert(MD == getCurMethodDecl() && "Method parsing confused"); 3377 MD->setBody(Body); 3378 if (!MD->getResultType()->isVoidType()) 3379 CheckFallThroughForFunctionDef(MD, Body); 3380 MD->setEndLoc(Body->getLocEnd()); 3381 3382 if (!MD->isInvalidDecl()) 3383 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 3384 } else { 3385 Body->Destroy(Context); 3386 return DeclPtrTy(); 3387 } 3388 if (!IsInstantiation) 3389 PopDeclContext(); 3390 3391 // Verify and clean out per-function state. 3392 3393 assert(&getLabelMap() == &FunctionLabelMap && "Didn't pop block right?"); 3394 3395 // Check goto/label use. 3396 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 3397 I = FunctionLabelMap.begin(), E = FunctionLabelMap.end(); I != E; ++I) { 3398 LabelStmt *L = I->second; 3399 3400 // Verify that we have no forward references left. If so, there was a goto 3401 // or address of a label taken, but no definition of it. Label fwd 3402 // definitions are indicated with a null substmt. 3403 if (L->getSubStmt() != 0) 3404 continue; 3405 3406 // Emit error. 3407 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 3408 3409 // At this point, we have gotos that use the bogus label. Stitch it into 3410 // the function body so that they aren't leaked and that the AST is well 3411 // formed. 3412 if (Body == 0) { 3413 // The whole function wasn't parsed correctly, just delete this. 3414 L->Destroy(Context); 3415 continue; 3416 } 3417 3418 // Otherwise, the body is valid: we want to stitch the label decl into the 3419 // function somewhere so that it is properly owned and so that the goto 3420 // has a valid target. Do this by creating a new compound stmt with the 3421 // label in it. 3422 3423 // Give the label a sub-statement. 3424 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 3425 3426 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 3427 cast<CXXTryStmt>(Body)->getTryBlock() : 3428 cast<CompoundStmt>(Body); 3429 std::vector<Stmt*> Elements(Compound->body_begin(), Compound->body_end()); 3430 Elements.push_back(L); 3431 Compound->setStmts(Context, &Elements[0], Elements.size()); 3432 } 3433 FunctionLabelMap.clear(); 3434 3435 if (!Body) return D; 3436 3437 // Verify that that gotos and switch cases don't jump into scopes illegally. 3438 if (CurFunctionNeedsScopeChecking) 3439 DiagnoseInvalidJumps(Body); 3440 3441 // C++ constructors that have function-try-blocks can't have return 3442 // statements in the handlers of that block. (C++ [except.handle]p14) 3443 // Verify this. 3444 if (isa<CXXConstructorDecl>(dcl) && isa<CXXTryStmt>(Body)) 3445 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 3446 3447 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 3448 Destructor->computeBaseOrMembersToDestroy(Context); 3449 return D; 3450} 3451 3452/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 3453/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 3454NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 3455 IdentifierInfo &II, Scope *S) { 3456 // Before we produce a declaration for an implicitly defined 3457 // function, see whether there was a locally-scoped declaration of 3458 // this name as a function or variable. If so, use that 3459 // (non-visible) declaration, and complain about it. 3460 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3461 = LocallyScopedExternalDecls.find(&II); 3462 if (Pos != LocallyScopedExternalDecls.end()) { 3463 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 3464 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 3465 return Pos->second; 3466 } 3467 3468 // Extension in C99. Legal in C90, but warn about it. 3469 if (getLangOptions().C99) 3470 Diag(Loc, diag::ext_implicit_function_decl) << &II; 3471 else 3472 Diag(Loc, diag::warn_implicit_function_decl) << &II; 3473 3474 // FIXME: handle stuff like: 3475 // void foo() { extern float X(); } 3476 // void bar() { X(); } <-- implicit decl for X in another scope. 3477 3478 // Set a Declarator for the implicit definition: int foo(); 3479 const char *Dummy; 3480 DeclSpec DS; 3481 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 3482 Error = Error; // Silence warning. 3483 assert(!Error && "Error setting up implicit decl!"); 3484 Declarator D(DS, Declarator::BlockContext); 3485 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 3486 0, 0, false, SourceLocation(), 3487 false, 0,0,0, Loc, D), 3488 SourceLocation()); 3489 D.SetIdentifier(&II, Loc); 3490 3491 // Insert this function into translation-unit scope. 3492 3493 DeclContext *PrevDC = CurContext; 3494 CurContext = Context.getTranslationUnitDecl(); 3495 3496 FunctionDecl *FD = 3497 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 3498 FD->setImplicit(); 3499 3500 CurContext = PrevDC; 3501 3502 AddKnownFunctionAttributes(FD); 3503 3504 return FD; 3505} 3506 3507/// \brief Adds any function attributes that we know a priori based on 3508/// the declaration of this function. 3509/// 3510/// These attributes can apply both to implicitly-declared builtins 3511/// (like __builtin___printf_chk) or to library-declared functions 3512/// like NSLog or printf. 3513void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 3514 if (FD->isInvalidDecl()) 3515 return; 3516 3517 // If this is a built-in function, map its builtin attributes to 3518 // actual attributes. 3519 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 3520 // Handle printf-formatting attributes. 3521 unsigned FormatIdx; 3522 bool HasVAListArg; 3523 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 3524 if (!FD->getAttr<FormatAttr>()) 3525 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 3526 HasVAListArg ? 0 : FormatIdx + 2)); 3527 } 3528 3529 // Mark const if we don't care about errno and that is the only 3530 // thing preventing the function from being const. This allows 3531 // IRgen to use LLVM intrinsics for such functions. 3532 if (!getLangOptions().MathErrno && 3533 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 3534 if (!FD->getAttr<ConstAttr>()) 3535 FD->addAttr(::new (Context) ConstAttr()); 3536 } 3537 } 3538 3539 IdentifierInfo *Name = FD->getIdentifier(); 3540 if (!Name) 3541 return; 3542 if ((!getLangOptions().CPlusPlus && 3543 FD->getDeclContext()->isTranslationUnit()) || 3544 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 3545 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 3546 LinkageSpecDecl::lang_c)) { 3547 // Okay: this could be a libc/libm/Objective-C function we know 3548 // about. 3549 } else 3550 return; 3551 3552 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 3553 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 3554 // FIXME: We known better than our headers. 3555 const_cast<FormatAttr *>(Format)->setType("printf"); 3556 } else 3557 FD->addAttr(::new (Context) FormatAttr("printf", 1, 3558 Name->isStr("NSLogv") ? 0 : 2)); 3559 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 3560 if (!FD->getAttr<FormatAttr>()) 3561 FD->addAttr(::new (Context) FormatAttr("printf", 2, 3562 Name->isStr("vasprintf") ? 0 : 3)); 3563 } 3564} 3565 3566TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T) { 3567 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 3568 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3569 3570 // Scope manipulation handled by caller. 3571 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 3572 D.getIdentifierLoc(), 3573 D.getIdentifier(), 3574 T); 3575 3576 if (TagType *TT = dyn_cast<TagType>(T)) { 3577 TagDecl *TD = TT->getDecl(); 3578 3579 // If the TagDecl that the TypedefDecl points to is an anonymous decl 3580 // keep track of the TypedefDecl. 3581 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 3582 TD->setTypedefForAnonDecl(NewTD); 3583 } 3584 3585 if (D.isInvalidType()) 3586 NewTD->setInvalidDecl(); 3587 return NewTD; 3588} 3589 3590 3591/// \brief Determine whether a tag with a given kind is acceptable 3592/// as a redeclaration of the given tag declaration. 3593/// 3594/// \returns true if the new tag kind is acceptable, false otherwise. 3595bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 3596 TagDecl::TagKind NewTag, 3597 SourceLocation NewTagLoc, 3598 const IdentifierInfo &Name) { 3599 // C++ [dcl.type.elab]p3: 3600 // The class-key or enum keyword present in the 3601 // elaborated-type-specifier shall agree in kind with the 3602 // declaration to which the name in theelaborated-type-specifier 3603 // refers. This rule also applies to the form of 3604 // elaborated-type-specifier that declares a class-name or 3605 // friend class since it can be construed as referring to the 3606 // definition of the class. Thus, in any 3607 // elaborated-type-specifier, the enum keyword shall be used to 3608 // refer to an enumeration (7.2), the union class-keyshall be 3609 // used to refer to a union (clause 9), and either the class or 3610 // struct class-key shall be used to refer to a class (clause 9) 3611 // declared using the class or struct class-key. 3612 TagDecl::TagKind OldTag = Previous->getTagKind(); 3613 if (OldTag == NewTag) 3614 return true; 3615 3616 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 3617 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 3618 // Warn about the struct/class tag mismatch. 3619 bool isTemplate = false; 3620 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 3621 isTemplate = Record->getDescribedClassTemplate(); 3622 3623 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 3624 << (NewTag == TagDecl::TK_class) 3625 << isTemplate << &Name 3626 << CodeModificationHint::CreateReplacement(SourceRange(NewTagLoc), 3627 OldTag == TagDecl::TK_class? "class" : "struct"); 3628 Diag(Previous->getLocation(), diag::note_previous_use); 3629 return true; 3630 } 3631 return false; 3632} 3633 3634/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 3635/// former case, Name will be non-null. In the later case, Name will be null. 3636/// TagSpec indicates what kind of tag this is. TK indicates whether this is a 3637/// reference/declaration/definition of a tag. 3638Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, 3639 SourceLocation KWLoc, const CXXScopeSpec &SS, 3640 IdentifierInfo *Name, SourceLocation NameLoc, 3641 AttributeList *Attr, AccessSpecifier AS, 3642 MultiTemplateParamsArg TemplateParameterLists, 3643 bool &OwnedDecl) { 3644 // If this is not a definition, it must have a name. 3645 assert((Name != 0 || TK == TK_Definition) && 3646 "Nameless record must be a definition!"); 3647 3648 OwnedDecl = false; 3649 TagDecl::TagKind Kind; 3650 switch (TagSpec) { 3651 default: assert(0 && "Unknown tag type!"); 3652 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 3653 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 3654 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 3655 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 3656 } 3657 3658 if (TK != TK_Reference) { 3659 if (TemplateParameterList *TemplateParams 3660 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 3661 (TemplateParameterList**)TemplateParameterLists.get(), 3662 TemplateParameterLists.size())) { 3663 if (TemplateParams->size() > 0) { 3664 // This is a declaration or definition of a class template (which may 3665 // be a member of another template). 3666 OwnedDecl = false; 3667 DeclResult Result = ActOnClassTemplate(S, TagSpec, TK, KWLoc, 3668 SS, Name, NameLoc, Attr, 3669 move(TemplateParameterLists), 3670 AS); 3671 return Result.get(); 3672 } else { 3673 // FIXME: diagnose the extraneous 'template<>', once we recover 3674 // slightly better in ParseTemplate.cpp from bogus template 3675 // parameters. 3676 } 3677 } 3678 } 3679 3680 DeclContext *SearchDC = CurContext; 3681 DeclContext *DC = CurContext; 3682 NamedDecl *PrevDecl = 0; 3683 3684 bool Invalid = false; 3685 3686 if (Name && SS.isNotEmpty()) { 3687 // We have a nested-name tag ('struct foo::bar'). 3688 3689 // Check for invalid 'foo::'. 3690 if (SS.isInvalid()) { 3691 Name = 0; 3692 goto CreateNewDecl; 3693 } 3694 3695 if (RequireCompleteDeclContext(SS)) 3696 return DeclPtrTy::make((Decl *)0); 3697 3698 DC = computeDeclContext(SS, true); 3699 SearchDC = DC; 3700 // Look-up name inside 'foo::'. 3701 PrevDecl 3702 = dyn_cast_or_null<TagDecl>( 3703 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 3704 3705 // A tag 'foo::bar' must already exist. 3706 if (PrevDecl == 0) { 3707 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 3708 Name = 0; 3709 Invalid = true; 3710 goto CreateNewDecl; 3711 } 3712 } else if (Name) { 3713 // If this is a named struct, check to see if there was a previous forward 3714 // declaration or definition. 3715 // FIXME: We're looking into outer scopes here, even when we 3716 // shouldn't be. Doing so can result in ambiguities that we 3717 // shouldn't be diagnosing. 3718 LookupResult R = LookupName(S, Name, LookupTagName, 3719 /*RedeclarationOnly=*/(TK != TK_Reference)); 3720 if (R.isAmbiguous()) { 3721 DiagnoseAmbiguousLookup(R, Name, NameLoc); 3722 // FIXME: This is not best way to recover from case like: 3723 // 3724 // struct S s; 3725 // 3726 // causes needless "incomplete type" error later. 3727 Name = 0; 3728 PrevDecl = 0; 3729 Invalid = true; 3730 } 3731 else 3732 PrevDecl = R; 3733 3734 if (!getLangOptions().CPlusPlus && TK != TK_Reference) { 3735 // FIXME: This makes sure that we ignore the contexts associated 3736 // with C structs, unions, and enums when looking for a matching 3737 // tag declaration or definition. See the similar lookup tweak 3738 // in Sema::LookupName; is there a better way to deal with this? 3739 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 3740 SearchDC = SearchDC->getParent(); 3741 } 3742 } 3743 3744 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3745 // Maybe we will complain about the shadowed template parameter. 3746 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 3747 // Just pretend that we didn't see the previous declaration. 3748 PrevDecl = 0; 3749 } 3750 3751 if (PrevDecl) { 3752 // Check whether the previous declaration is usable. 3753 (void)DiagnoseUseOfDecl(PrevDecl, NameLoc); 3754 3755 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 3756 // If this is a use of a previous tag, or if the tag is already declared 3757 // in the same scope (so that the definition/declaration completes or 3758 // rementions the tag), reuse the decl. 3759 if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { 3760 // Make sure that this wasn't declared as an enum and now used as a 3761 // struct or something similar. 3762 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 3763 bool SafeToContinue 3764 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 3765 Kind != TagDecl::TK_enum); 3766 if (SafeToContinue) 3767 Diag(KWLoc, diag::err_use_with_wrong_tag) 3768 << Name 3769 << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), 3770 PrevTagDecl->getKindName()); 3771 else 3772 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 3773 Diag(PrevDecl->getLocation(), diag::note_previous_use); 3774 3775 if (SafeToContinue) 3776 Kind = PrevTagDecl->getTagKind(); 3777 else { 3778 // Recover by making this an anonymous redefinition. 3779 Name = 0; 3780 PrevDecl = 0; 3781 Invalid = true; 3782 } 3783 } 3784 3785 if (!Invalid) { 3786 // If this is a use, just return the declaration we found. 3787 3788 // FIXME: In the future, return a variant or some other clue 3789 // for the consumer of this Decl to know it doesn't own it. 3790 // For our current ASTs this shouldn't be a problem, but will 3791 // need to be changed with DeclGroups. 3792 if (TK == TK_Reference) 3793 return DeclPtrTy::make(PrevDecl); 3794 3795 // Diagnose attempts to redefine a tag. 3796 if (TK == TK_Definition) { 3797 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 3798 Diag(NameLoc, diag::err_redefinition) << Name; 3799 Diag(Def->getLocation(), diag::note_previous_definition); 3800 // If this is a redefinition, recover by making this 3801 // struct be anonymous, which will make any later 3802 // references get the previous definition. 3803 Name = 0; 3804 PrevDecl = 0; 3805 Invalid = true; 3806 } else { 3807 // If the type is currently being defined, complain 3808 // about a nested redefinition. 3809 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 3810 if (Tag->isBeingDefined()) { 3811 Diag(NameLoc, diag::err_nested_redefinition) << Name; 3812 Diag(PrevTagDecl->getLocation(), 3813 diag::note_previous_definition); 3814 Name = 0; 3815 PrevDecl = 0; 3816 Invalid = true; 3817 } 3818 } 3819 3820 // Okay, this is definition of a previously declared or referenced 3821 // tag PrevDecl. We're going to create a new Decl for it. 3822 } 3823 } 3824 // If we get here we have (another) forward declaration or we 3825 // have a definition. Just create a new decl. 3826 } else { 3827 // If we get here, this is a definition of a new tag type in a nested 3828 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 3829 // new decl/type. We set PrevDecl to NULL so that the entities 3830 // have distinct types. 3831 PrevDecl = 0; 3832 } 3833 // If we get here, we're going to create a new Decl. If PrevDecl 3834 // is non-NULL, it's a definition of the tag declared by 3835 // PrevDecl. If it's NULL, we have a new definition. 3836 } else { 3837 // PrevDecl is a namespace, template, or anything else 3838 // that lives in the IDNS_Tag identifier namespace. 3839 if (isDeclInScope(PrevDecl, SearchDC, S)) { 3840 // The tag name clashes with a namespace name, issue an error and 3841 // recover by making this tag be anonymous. 3842 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 3843 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3844 Name = 0; 3845 PrevDecl = 0; 3846 Invalid = true; 3847 } else { 3848 // The existing declaration isn't relevant to us; we're in a 3849 // new scope, so clear out the previous declaration. 3850 PrevDecl = 0; 3851 } 3852 } 3853 } else if (TK == TK_Reference && SS.isEmpty() && Name && 3854 (Kind != TagDecl::TK_enum || !getLangOptions().CPlusPlus)) { 3855 // C++ [basic.scope.pdecl]p5: 3856 // -- for an elaborated-type-specifier of the form 3857 // 3858 // class-key identifier 3859 // 3860 // if the elaborated-type-specifier is used in the 3861 // decl-specifier-seq or parameter-declaration-clause of a 3862 // function defined in namespace scope, the identifier is 3863 // declared as a class-name in the namespace that contains 3864 // the declaration; otherwise, except as a friend 3865 // declaration, the identifier is declared in the smallest 3866 // non-class, non-function-prototype scope that contains the 3867 // declaration. 3868 // 3869 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 3870 // C structs and unions. 3871 // 3872 // GNU C also supports this behavior as part of its incomplete 3873 // enum types extension, while GNU C++ does not. 3874 // 3875 // Find the context where we'll be declaring the tag. 3876 // FIXME: We would like to maintain the current DeclContext as the 3877 // lexical context, 3878 while (SearchDC->isRecord()) 3879 SearchDC = SearchDC->getParent(); 3880 3881 // Find the scope where we'll be declaring the tag. 3882 while (S->isClassScope() || 3883 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 3884 ((S->getFlags() & Scope::DeclScope) == 0) || 3885 (S->getEntity() && 3886 ((DeclContext *)S->getEntity())->isTransparentContext())) 3887 S = S->getParent(); 3888 } 3889 3890CreateNewDecl: 3891 3892 // If there is an identifier, use the location of the identifier as the 3893 // location of the decl, otherwise use the location of the struct/union 3894 // keyword. 3895 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 3896 3897 // Otherwise, create a new declaration. If there is a previous 3898 // declaration of the same entity, the two will be linked via 3899 // PrevDecl. 3900 TagDecl *New; 3901 3902 if (Kind == TagDecl::TK_enum) { 3903 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3904 // enum X { A, B, C } D; D should chain to X. 3905 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 3906 cast_or_null<EnumDecl>(PrevDecl)); 3907 // If this is an undefined enum, warn. 3908 if (TK != TK_Definition && !Invalid) { 3909 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 3910 : diag::ext_forward_ref_enum; 3911 Diag(Loc, DK); 3912 } 3913 } else { 3914 // struct/union/class 3915 3916 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3917 // struct X { int A; } D; D should chain to X. 3918 if (getLangOptions().CPlusPlus) 3919 // FIXME: Look for a way to use RecordDecl for simple structs. 3920 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 3921 cast_or_null<CXXRecordDecl>(PrevDecl)); 3922 else 3923 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 3924 cast_or_null<RecordDecl>(PrevDecl)); 3925 } 3926 3927 if (Kind != TagDecl::TK_enum) { 3928 // Handle #pragma pack: if the #pragma pack stack has non-default 3929 // alignment, make up a packed attribute for this decl. These 3930 // attributes are checked when the ASTContext lays out the 3931 // structure. 3932 // 3933 // It is important for implementing the correct semantics that this 3934 // happen here (in act on tag decl). The #pragma pack stack is 3935 // maintained as a result of parser callbacks which can occur at 3936 // many points during the parsing of a struct declaration (because 3937 // the #pragma tokens are effectively skipped over during the 3938 // parsing of the struct). 3939 if (unsigned Alignment = getPragmaPackAlignment()) 3940 New->addAttr(::new (Context) PackedAttr(Alignment * 8)); 3941 } 3942 3943 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 3944 // C++ [dcl.typedef]p3: 3945 // [...] Similarly, in a given scope, a class or enumeration 3946 // shall not be declared with the same name as a typedef-name 3947 // that is declared in that scope and refers to a type other 3948 // than the class or enumeration itself. 3949 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 3950 TypedefDecl *PrevTypedef = 0; 3951 if (Lookup.getKind() == LookupResult::Found) 3952 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 3953 3954 if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && 3955 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 3956 Context.getCanonicalType(Context.getTypeDeclType(New))) { 3957 Diag(Loc, diag::err_tag_definition_of_typedef) 3958 << Context.getTypeDeclType(New) 3959 << PrevTypedef->getUnderlyingType(); 3960 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 3961 Invalid = true; 3962 } 3963 } 3964 3965 if (Invalid) 3966 New->setInvalidDecl(); 3967 3968 if (Attr) 3969 ProcessDeclAttributeList(S, New, Attr); 3970 3971 // If we're declaring or defining a tag in function prototype scope 3972 // in C, note that this type can only be used within the function. 3973 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 3974 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 3975 3976 // Set the lexical context. If the tag has a C++ scope specifier, the 3977 // lexical context will be different from the semantic context. 3978 New->setLexicalDeclContext(CurContext); 3979 3980 // Set the access specifier. 3981 if (!Invalid) 3982 SetMemberAccessSpecifier(New, PrevDecl, AS); 3983 3984 if (TK == TK_Definition) 3985 New->startDefinition(); 3986 3987 // If this has an identifier, add it to the scope stack. 3988 if (Name) { 3989 S = getNonFieldDeclScope(S); 3990 PushOnScopeChains(New, S); 3991 } else { 3992 CurContext->addDecl(New); 3993 } 3994 3995 // If this is the C FILE type, notify the AST context. 3996 if (IdentifierInfo *II = New->getIdentifier()) 3997 if (!New->isInvalidDecl() && 3998 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 3999 II->isStr("FILE")) 4000 Context.setFILEDecl(New); 4001 4002 OwnedDecl = true; 4003 return DeclPtrTy::make(New); 4004} 4005 4006void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 4007 AdjustDeclIfTemplate(TagD); 4008 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 4009 4010 // Enter the tag context. 4011 PushDeclContext(S, Tag); 4012 4013 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 4014 FieldCollector->StartClass(); 4015 4016 if (Record->getIdentifier()) { 4017 // C++ [class]p2: 4018 // [...] The class-name is also inserted into the scope of the 4019 // class itself; this is known as the injected-class-name. For 4020 // purposes of access checking, the injected-class-name is treated 4021 // as if it were a public member name. 4022 CXXRecordDecl *InjectedClassName 4023 = CXXRecordDecl::Create(Context, Record->getTagKind(), 4024 CurContext, Record->getLocation(), 4025 Record->getIdentifier(), 4026 Record->getTagKeywordLoc(), 4027 Record); 4028 InjectedClassName->setImplicit(); 4029 InjectedClassName->setAccess(AS_public); 4030 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 4031 InjectedClassName->setDescribedClassTemplate(Template); 4032 PushOnScopeChains(InjectedClassName, S); 4033 assert(InjectedClassName->isInjectedClassName() && 4034 "Broken injected-class-name"); 4035 } 4036 } 4037} 4038 4039void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 4040 SourceLocation RBraceLoc) { 4041 AdjustDeclIfTemplate(TagD); 4042 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 4043 Tag->setRBraceLoc(RBraceLoc); 4044 4045 if (isa<CXXRecordDecl>(Tag)) 4046 FieldCollector->FinishClass(); 4047 4048 // Exit this scope of this tag's definition. 4049 PopDeclContext(); 4050 4051 // Notify the consumer that we've defined a tag. 4052 Consumer.HandleTagDeclDefinition(Tag); 4053} 4054 4055// Note that FieldName may be null for anonymous bitfields. 4056bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 4057 QualType FieldTy, const Expr *BitWidth) { 4058 4059 // C99 6.7.2.1p4 - verify the field type. 4060 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 4061 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 4062 // Handle incomplete types with specific error. 4063 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 4064 return true; 4065 if (FieldName) 4066 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 4067 << FieldName << FieldTy << BitWidth->getSourceRange(); 4068 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 4069 << FieldTy << BitWidth->getSourceRange(); 4070 } 4071 4072 // If the bit-width is type- or value-dependent, don't try to check 4073 // it now. 4074 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 4075 return false; 4076 4077 llvm::APSInt Value; 4078 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 4079 return true; 4080 4081 // Zero-width bitfield is ok for anonymous field. 4082 if (Value == 0 && FieldName) 4083 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 4084 4085 if (Value.isSigned() && Value.isNegative()) { 4086 if (FieldName) 4087 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 4088 << FieldName << Value.toString(10); 4089 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 4090 << Value.toString(10); 4091 } 4092 4093 if (!FieldTy->isDependentType()) { 4094 uint64_t TypeSize = Context.getTypeSize(FieldTy); 4095 if (Value.getZExtValue() > TypeSize) { 4096 if (FieldName) 4097 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 4098 << FieldName << (unsigned)TypeSize; 4099 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 4100 << (unsigned)TypeSize; 4101 } 4102 } 4103 4104 return false; 4105} 4106 4107/// ActOnField - Each field of a struct/union/class is passed into this in order 4108/// to create a FieldDecl object for it. 4109Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 4110 SourceLocation DeclStart, 4111 Declarator &D, ExprTy *BitfieldWidth) { 4112 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 4113 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 4114 AS_public); 4115 return DeclPtrTy::make(Res); 4116} 4117 4118/// HandleField - Analyze a field of a C struct or a C++ data member. 4119/// 4120FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 4121 SourceLocation DeclStart, 4122 Declarator &D, Expr *BitWidth, 4123 AccessSpecifier AS) { 4124 IdentifierInfo *II = D.getIdentifier(); 4125 SourceLocation Loc = DeclStart; 4126 if (II) Loc = D.getIdentifierLoc(); 4127 4128 QualType T = GetTypeForDeclarator(D, S); 4129 if (getLangOptions().CPlusPlus) 4130 CheckExtraCXXDefaultArguments(D); 4131 4132 DiagnoseFunctionSpecifiers(D); 4133 4134 if (D.getDeclSpec().isThreadSpecified()) 4135 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4136 4137 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 4138 4139 if (PrevDecl && PrevDecl->isTemplateParameter()) { 4140 // Maybe we will complain about the shadowed template parameter. 4141 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4142 // Just pretend that we didn't see the previous declaration. 4143 PrevDecl = 0; 4144 } 4145 4146 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 4147 PrevDecl = 0; 4148 4149 bool Mutable 4150 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 4151 SourceLocation TSSL = D.getSourceRange().getBegin(); 4152 FieldDecl *NewFD 4153 = CheckFieldDecl(II, T, Record, Loc, Mutable, BitWidth, TSSL, 4154 AS, PrevDecl, &D); 4155 if (NewFD->isInvalidDecl() && PrevDecl) { 4156 // Don't introduce NewFD into scope; there's already something 4157 // with the same name in the same scope. 4158 } else if (II) { 4159 PushOnScopeChains(NewFD, S); 4160 } else 4161 Record->addDecl(NewFD); 4162 4163 return NewFD; 4164} 4165 4166/// \brief Build a new FieldDecl and check its well-formedness. 4167/// 4168/// This routine builds a new FieldDecl given the fields name, type, 4169/// record, etc. \p PrevDecl should refer to any previous declaration 4170/// with the same name and in the same scope as the field to be 4171/// created. 4172/// 4173/// \returns a new FieldDecl. 4174/// 4175/// \todo The Declarator argument is a hack. It will be removed once 4176FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 4177 RecordDecl *Record, SourceLocation Loc, 4178 bool Mutable, Expr *BitWidth, 4179 SourceLocation TSSL, 4180 AccessSpecifier AS, NamedDecl *PrevDecl, 4181 Declarator *D) { 4182 IdentifierInfo *II = Name.getAsIdentifierInfo(); 4183 bool InvalidDecl = false; 4184 if (D) InvalidDecl = D->isInvalidType(); 4185 4186 // If we receive a broken type, recover by assuming 'int' and 4187 // marking this declaration as invalid. 4188 if (T.isNull()) { 4189 InvalidDecl = true; 4190 T = Context.IntTy; 4191 } 4192 4193 // C99 6.7.2.1p8: A member of a structure or union may have any type other 4194 // than a variably modified type. 4195 if (T->isVariablyModifiedType()) { 4196 bool SizeIsNegative; 4197 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 4198 SizeIsNegative); 4199 if (!FixedTy.isNull()) { 4200 Diag(Loc, diag::warn_illegal_constant_array_size); 4201 T = FixedTy; 4202 } else { 4203 if (SizeIsNegative) 4204 Diag(Loc, diag::err_typecheck_negative_array_size); 4205 else 4206 Diag(Loc, diag::err_typecheck_field_variable_size); 4207 InvalidDecl = true; 4208 } 4209 } 4210 4211 // Fields can not have abstract class types 4212 if (RequireNonAbstractType(Loc, T, diag::err_abstract_type_in_decl, 4213 AbstractFieldType)) 4214 InvalidDecl = true; 4215 4216 // If this is declared as a bit-field, check the bit-field. 4217 if (BitWidth && VerifyBitField(Loc, II, T, BitWidth)) { 4218 InvalidDecl = true; 4219 DeleteExpr(BitWidth); 4220 BitWidth = 0; 4221 } 4222 4223 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, BitWidth, 4224 Mutable, TSSL); 4225 if (InvalidDecl) 4226 NewFD->setInvalidDecl(); 4227 4228 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 4229 Diag(Loc, diag::err_duplicate_member) << II; 4230 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4231 NewFD->setInvalidDecl(); 4232 } 4233 4234 if (getLangOptions().CPlusPlus) { 4235 QualType EltTy = T; 4236 while (const ArrayType *AT = Context.getAsArrayType(EltTy)) 4237 EltTy = AT->getElementType(); 4238 4239 if (const RecordType *RT = EltTy->getAsRecordType()) { 4240 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 4241 4242 if (!RDecl->hasTrivialConstructor()) 4243 cast<CXXRecordDecl>(Record)->setHasTrivialConstructor(false); 4244 if (!RDecl->hasTrivialCopyConstructor()) 4245 cast<CXXRecordDecl>(Record)->setHasTrivialCopyConstructor(false); 4246 if (!RDecl->hasTrivialCopyAssignment()) 4247 cast<CXXRecordDecl>(Record)->setHasTrivialCopyAssignment(false); 4248 if (!RDecl->hasTrivialDestructor()) 4249 cast<CXXRecordDecl>(Record)->setHasTrivialDestructor(false); 4250 4251 // C++ 9.5p1: An object of a class with a non-trivial 4252 // constructor, a non-trivial copy constructor, a non-trivial 4253 // destructor, or a non-trivial copy assignment operator 4254 // cannot be a member of a union, nor can an array of such 4255 // objects. 4256 // TODO: C++0x alters this restriction significantly. 4257 if (Record->isUnion()) { 4258 // We check for copy constructors before constructors 4259 // because otherwise we'll never get complaints about 4260 // copy constructors. 4261 4262 const CXXSpecialMember invalid = (CXXSpecialMember) -1; 4263 4264 CXXSpecialMember member; 4265 if (!RDecl->hasTrivialCopyConstructor()) 4266 member = CXXCopyConstructor; 4267 else if (!RDecl->hasTrivialConstructor()) 4268 member = CXXDefaultConstructor; 4269 else if (!RDecl->hasTrivialCopyAssignment()) 4270 member = CXXCopyAssignment; 4271 else if (!RDecl->hasTrivialDestructor()) 4272 member = CXXDestructor; 4273 else 4274 member = invalid; 4275 4276 if (member != invalid) { 4277 Diag(Loc, diag::err_illegal_union_member) << Name << member; 4278 DiagnoseNontrivial(RT, member); 4279 NewFD->setInvalidDecl(); 4280 } 4281 } 4282 } 4283 } 4284 4285 if (getLangOptions().CPlusPlus && !T->isPODType()) 4286 cast<CXXRecordDecl>(Record)->setPOD(false); 4287 4288 // FIXME: We need to pass in the attributes given an AST 4289 // representation, not a parser representation. 4290 if (D) 4291 // FIXME: What to pass instead of TUScope? 4292 ProcessDeclAttributes(TUScope, NewFD, *D); 4293 4294 if (T.isObjCGCWeak()) 4295 Diag(Loc, diag::warn_attribute_weak_on_field); 4296 4297 NewFD->setAccess(AS); 4298 4299 // C++ [dcl.init.aggr]p1: 4300 // An aggregate is an array or a class (clause 9) with [...] no 4301 // private or protected non-static data members (clause 11). 4302 // A POD must be an aggregate. 4303 if (getLangOptions().CPlusPlus && 4304 (AS == AS_private || AS == AS_protected)) { 4305 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 4306 CXXRecord->setAggregate(false); 4307 CXXRecord->setPOD(false); 4308 } 4309 4310 return NewFD; 4311} 4312 4313/// DiagnoseNontrivial - Given that a class has a non-trivial 4314/// special member, figure out why. 4315void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 4316 QualType QT(T, 0U); 4317 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 4318 4319 // Check whether the member was user-declared. 4320 switch (member) { 4321 case CXXDefaultConstructor: 4322 if (RD->hasUserDeclaredConstructor()) { 4323 typedef CXXRecordDecl::ctor_iterator ctor_iter; 4324 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce; ++ci) 4325 if (!ci->isImplicitlyDefined(Context)) { 4326 SourceLocation CtorLoc = ci->getLocation(); 4327 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 4328 return; 4329 } 4330 4331 assert(0 && "found no user-declared constructors"); 4332 return; 4333 } 4334 break; 4335 4336 case CXXCopyConstructor: 4337 if (RD->hasUserDeclaredCopyConstructor()) { 4338 SourceLocation CtorLoc = 4339 RD->getCopyConstructor(Context, 0)->getLocation(); 4340 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 4341 return; 4342 } 4343 break; 4344 4345 case CXXCopyAssignment: 4346 if (RD->hasUserDeclaredCopyAssignment()) { 4347 // FIXME: this should use the location of the copy 4348 // assignment, not the type. 4349 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 4350 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 4351 return; 4352 } 4353 break; 4354 4355 case CXXDestructor: 4356 if (RD->hasUserDeclaredDestructor()) { 4357 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation(); 4358 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 4359 return; 4360 } 4361 break; 4362 } 4363 4364 typedef CXXRecordDecl::base_class_iterator base_iter; 4365 4366 // Virtual bases and members inhibit trivial copying/construction, 4367 // but not trivial destruction. 4368 if (member != CXXDestructor) { 4369 // Check for virtual bases. vbases includes indirect virtual bases, 4370 // so we just iterate through the direct bases. 4371 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 4372 if (bi->isVirtual()) { 4373 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 4374 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 4375 return; 4376 } 4377 4378 // Check for virtual methods. 4379 typedef CXXRecordDecl::method_iterator meth_iter; 4380 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 4381 ++mi) { 4382 if (mi->isVirtual()) { 4383 SourceLocation MLoc = mi->getSourceRange().getBegin(); 4384 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 4385 return; 4386 } 4387 } 4388 } 4389 4390 bool (CXXRecordDecl::*hasTrivial)() const; 4391 switch (member) { 4392 case CXXDefaultConstructor: 4393 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 4394 case CXXCopyConstructor: 4395 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 4396 case CXXCopyAssignment: 4397 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 4398 case CXXDestructor: 4399 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 4400 default: 4401 assert(0 && "unexpected special member"); return; 4402 } 4403 4404 // Check for nontrivial bases (and recurse). 4405 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 4406 const RecordType *BaseRT = bi->getType()->getAsRecordType(); 4407 assert(BaseRT); 4408 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 4409 if (!(BaseRecTy->*hasTrivial)()) { 4410 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 4411 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 4412 DiagnoseNontrivial(BaseRT, member); 4413 return; 4414 } 4415 } 4416 4417 // Check for nontrivial members (and recurse). 4418 typedef RecordDecl::field_iterator field_iter; 4419 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 4420 ++fi) { 4421 QualType EltTy = (*fi)->getType(); 4422 while (const ArrayType *AT = Context.getAsArrayType(EltTy)) 4423 EltTy = AT->getElementType(); 4424 4425 if (const RecordType *EltRT = EltTy->getAsRecordType()) { 4426 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 4427 4428 if (!(EltRD->*hasTrivial)()) { 4429 SourceLocation FLoc = (*fi)->getLocation(); 4430 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 4431 DiagnoseNontrivial(EltRT, member); 4432 return; 4433 } 4434 } 4435 } 4436 4437 assert(0 && "found no explanation for non-trivial member"); 4438} 4439 4440/// TranslateIvarVisibility - Translate visibility from a token ID to an 4441/// AST enum value. 4442static ObjCIvarDecl::AccessControl 4443TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 4444 switch (ivarVisibility) { 4445 default: assert(0 && "Unknown visitibility kind"); 4446 case tok::objc_private: return ObjCIvarDecl::Private; 4447 case tok::objc_public: return ObjCIvarDecl::Public; 4448 case tok::objc_protected: return ObjCIvarDecl::Protected; 4449 case tok::objc_package: return ObjCIvarDecl::Package; 4450 } 4451} 4452 4453/// ActOnIvar - Each ivar field of an objective-c class is passed into this 4454/// in order to create an IvarDecl object for it. 4455Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 4456 SourceLocation DeclStart, 4457 DeclPtrTy IntfDecl, 4458 Declarator &D, ExprTy *BitfieldWidth, 4459 tok::ObjCKeywordKind Visibility) { 4460 4461 IdentifierInfo *II = D.getIdentifier(); 4462 Expr *BitWidth = (Expr*)BitfieldWidth; 4463 SourceLocation Loc = DeclStart; 4464 if (II) Loc = D.getIdentifierLoc(); 4465 4466 // FIXME: Unnamed fields can be handled in various different ways, for 4467 // example, unnamed unions inject all members into the struct namespace! 4468 4469 QualType T = GetTypeForDeclarator(D, S); 4470 4471 if (BitWidth) { 4472 // 6.7.2.1p3, 6.7.2.1p4 4473 if (VerifyBitField(Loc, II, T, BitWidth)) { 4474 D.setInvalidType(); 4475 DeleteExpr(BitWidth); 4476 BitWidth = 0; 4477 } 4478 } else { 4479 // Not a bitfield. 4480 4481 // validate II. 4482 4483 } 4484 4485 // C99 6.7.2.1p8: A member of a structure or union may have any type other 4486 // than a variably modified type. 4487 if (T->isVariablyModifiedType()) { 4488 Diag(Loc, diag::err_typecheck_ivar_variable_size); 4489 D.setInvalidType(); 4490 } 4491 4492 // Get the visibility (access control) for this ivar. 4493 ObjCIvarDecl::AccessControl ac = 4494 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 4495 : ObjCIvarDecl::None; 4496 // Must set ivar's DeclContext to its enclosing interface. 4497 Decl *EnclosingDecl = IntfDecl.getAs<Decl>(); 4498 DeclContext *EnclosingContext; 4499 if (ObjCImplementationDecl *IMPDecl = 4500 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 4501 // Case of ivar declared in an implementation. Context is that of its class. 4502 ObjCInterfaceDecl* IDecl = IMPDecl->getClassInterface(); 4503 assert(IDecl && "No class- ActOnIvar"); 4504 EnclosingContext = cast_or_null<DeclContext>(IDecl); 4505 } 4506 else 4507 EnclosingContext = dyn_cast<DeclContext>(EnclosingDecl); 4508 assert(EnclosingContext && "null DeclContext for ivar - ActOnIvar"); 4509 4510 // Construct the decl. 4511 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 4512 EnclosingContext, Loc, II, T,ac, 4513 (Expr *)BitfieldWidth); 4514 4515 if (II) { 4516 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 4517 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 4518 && !isa<TagDecl>(PrevDecl)) { 4519 Diag(Loc, diag::err_duplicate_member) << II; 4520 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4521 NewID->setInvalidDecl(); 4522 } 4523 } 4524 4525 // Process attributes attached to the ivar. 4526 ProcessDeclAttributes(S, NewID, D); 4527 4528 if (D.isInvalidType()) 4529 NewID->setInvalidDecl(); 4530 4531 if (II) { 4532 // FIXME: When interfaces are DeclContexts, we'll need to add 4533 // these to the interface. 4534 S->AddDecl(DeclPtrTy::make(NewID)); 4535 IdResolver.AddDecl(NewID); 4536 } 4537 4538 return DeclPtrTy::make(NewID); 4539} 4540 4541void Sema::ActOnFields(Scope* S, 4542 SourceLocation RecLoc, DeclPtrTy RecDecl, 4543 DeclPtrTy *Fields, unsigned NumFields, 4544 SourceLocation LBrac, SourceLocation RBrac, 4545 AttributeList *Attr) { 4546 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 4547 assert(EnclosingDecl && "missing record or interface decl"); 4548 4549 // If the decl this is being inserted into is invalid, then it may be a 4550 // redeclaration or some other bogus case. Don't try to add fields to it. 4551 if (EnclosingDecl->isInvalidDecl()) { 4552 // FIXME: Deallocate fields? 4553 return; 4554 } 4555 4556 4557 // Verify that all the fields are okay. 4558 unsigned NumNamedMembers = 0; 4559 llvm::SmallVector<FieldDecl*, 32> RecFields; 4560 4561 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 4562 for (unsigned i = 0; i != NumFields; ++i) { 4563 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 4564 4565 // Get the type for the field. 4566 Type *FDTy = FD->getType().getTypePtr(); 4567 4568 if (!FD->isAnonymousStructOrUnion()) { 4569 // Remember all fields written by the user. 4570 RecFields.push_back(FD); 4571 } 4572 4573 // If the field is already invalid for some reason, don't emit more 4574 // diagnostics about it. 4575 if (FD->isInvalidDecl()) 4576 continue; 4577 4578 // C99 6.7.2.1p2: 4579 // A structure or union shall not contain a member with 4580 // incomplete or function type (hence, a structure shall not 4581 // contain an instance of itself, but may contain a pointer to 4582 // an instance of itself), except that the last member of a 4583 // structure with more than one named member may have incomplete 4584 // array type; such a structure (and any union containing, 4585 // possibly recursively, a member that is such a structure) 4586 // shall not be a member of a structure or an element of an 4587 // array. 4588 if (FDTy->isFunctionType()) { 4589 // Field declared as a function. 4590 Diag(FD->getLocation(), diag::err_field_declared_as_function) 4591 << FD->getDeclName(); 4592 FD->setInvalidDecl(); 4593 EnclosingDecl->setInvalidDecl(); 4594 continue; 4595 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 4596 Record && Record->isStruct()) { 4597 // Flexible array member. 4598 if (NumNamedMembers < 1) { 4599 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 4600 << FD->getDeclName(); 4601 FD->setInvalidDecl(); 4602 EnclosingDecl->setInvalidDecl(); 4603 continue; 4604 } 4605 // Okay, we have a legal flexible array member at the end of the struct. 4606 if (Record) 4607 Record->setHasFlexibleArrayMember(true); 4608 } else if (!FDTy->isDependentType() && 4609 RequireCompleteType(FD->getLocation(), FD->getType(), 4610 diag::err_field_incomplete)) { 4611 // Incomplete type 4612 FD->setInvalidDecl(); 4613 EnclosingDecl->setInvalidDecl(); 4614 continue; 4615 } else if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 4616 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 4617 // If this is a member of a union, then entire union becomes "flexible". 4618 if (Record && Record->isUnion()) { 4619 Record->setHasFlexibleArrayMember(true); 4620 } else { 4621 // If this is a struct/class and this is not the last element, reject 4622 // it. Note that GCC supports variable sized arrays in the middle of 4623 // structures. 4624 if (i != NumFields-1) 4625 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 4626 << FD->getDeclName() << FD->getType(); 4627 else { 4628 // We support flexible arrays at the end of structs in 4629 // other structs as an extension. 4630 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 4631 << FD->getDeclName(); 4632 if (Record) 4633 Record->setHasFlexibleArrayMember(true); 4634 } 4635 } 4636 } 4637 if (Record && FDTTy->getDecl()->hasObjectMember()) 4638 Record->setHasObjectMember(true); 4639 } else if (FDTy->isObjCInterfaceType()) { 4640 /// A field cannot be an Objective-c object 4641 Diag(FD->getLocation(), diag::err_statically_allocated_object); 4642 FD->setInvalidDecl(); 4643 EnclosingDecl->setInvalidDecl(); 4644 continue; 4645 } 4646 else if (getLangOptions().ObjC1 && 4647 getLangOptions().getGCMode() != LangOptions::NonGC && 4648 Record && 4649 (FD->getType()->isObjCObjectPointerType() || 4650 FD->getType().isObjCGCStrong())) 4651 Record->setHasObjectMember(true); 4652 // Keep track of the number of named members. 4653 if (FD->getIdentifier()) 4654 ++NumNamedMembers; 4655 } 4656 4657 // Okay, we successfully defined 'Record'. 4658 if (Record) { 4659 Record->completeDefinition(Context); 4660 } else { 4661 ObjCIvarDecl **ClsFields = 4662 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 4663 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 4664 ID->setIVarList(ClsFields, RecFields.size(), Context); 4665 ID->setLocEnd(RBrac); 4666 // Add ivar's to class's DeclContext. 4667 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 4668 ClsFields[i]->setLexicalDeclContext(ID); 4669 ID->addDecl(ClsFields[i]); 4670 } 4671 // Must enforce the rule that ivars in the base classes may not be 4672 // duplicates. 4673 if (ID->getSuperClass()) { 4674 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 4675 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 4676 ObjCIvarDecl* Ivar = (*IVI); 4677 4678 if (IdentifierInfo *II = Ivar->getIdentifier()) { 4679 ObjCIvarDecl* prevIvar = 4680 ID->getSuperClass()->lookupInstanceVariable(II); 4681 if (prevIvar) { 4682 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 4683 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 4684 } 4685 } 4686 } 4687 } 4688 } else if (ObjCImplementationDecl *IMPDecl = 4689 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 4690 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 4691 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 4692 // Ivar declared in @implementation never belongs to the implementation. 4693 // Only it is in implementation's lexical context. 4694 ClsFields[I]->setLexicalDeclContext(IMPDecl); 4695 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 4696 } 4697 } 4698 4699 if (Attr) 4700 ProcessDeclAttributeList(S, Record, Attr); 4701} 4702 4703EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 4704 EnumConstantDecl *LastEnumConst, 4705 SourceLocation IdLoc, 4706 IdentifierInfo *Id, 4707 ExprArg val) { 4708 Expr *Val = (Expr *)val.get(); 4709 4710 llvm::APSInt EnumVal(32); 4711 QualType EltTy; 4712 if (Val && !Val->isTypeDependent()) { 4713 // Make sure to promote the operand type to int. 4714 UsualUnaryConversions(Val); 4715 if (Val != val.get()) { 4716 val.release(); 4717 val = Val; 4718 } 4719 4720 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 4721 SourceLocation ExpLoc; 4722 if (!Val->isValueDependent() && 4723 VerifyIntegerConstantExpression(Val, &EnumVal)) { 4724 Val = 0; 4725 } else { 4726 EltTy = Val->getType(); 4727 } 4728 } 4729 4730 if (!Val) { 4731 if (LastEnumConst) { 4732 // Assign the last value + 1. 4733 EnumVal = LastEnumConst->getInitVal(); 4734 ++EnumVal; 4735 4736 // Check for overflow on increment. 4737 if (EnumVal < LastEnumConst->getInitVal()) 4738 Diag(IdLoc, diag::warn_enum_value_overflow); 4739 4740 EltTy = LastEnumConst->getType(); 4741 } else { 4742 // First value, set to zero. 4743 EltTy = Context.IntTy; 4744 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 4745 } 4746 } 4747 4748 val.release(); 4749 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 4750 Val, EnumVal); 4751} 4752 4753 4754Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 4755 DeclPtrTy lastEnumConst, 4756 SourceLocation IdLoc, 4757 IdentifierInfo *Id, 4758 SourceLocation EqualLoc, ExprTy *val) { 4759 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 4760 EnumConstantDecl *LastEnumConst = 4761 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 4762 Expr *Val = static_cast<Expr*>(val); 4763 4764 // The scope passed in may not be a decl scope. Zip up the scope tree until 4765 // we find one that is. 4766 S = getNonFieldDeclScope(S); 4767 4768 // Verify that there isn't already something declared with this name in this 4769 // scope. 4770 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 4771 if (PrevDecl && PrevDecl->isTemplateParameter()) { 4772 // Maybe we will complain about the shadowed template parameter. 4773 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 4774 // Just pretend that we didn't see the previous declaration. 4775 PrevDecl = 0; 4776 } 4777 4778 if (PrevDecl) { 4779 // When in C++, we may get a TagDecl with the same name; in this case the 4780 // enum constant will 'hide' the tag. 4781 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 4782 "Received TagDecl when not in C++!"); 4783 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 4784 if (isa<EnumConstantDecl>(PrevDecl)) 4785 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 4786 else 4787 Diag(IdLoc, diag::err_redefinition) << Id; 4788 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4789 if (Val) Val->Destroy(Context); 4790 return DeclPtrTy(); 4791 } 4792 } 4793 4794 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 4795 IdLoc, Id, Owned(Val)); 4796 4797 // Register this decl in the current scope stack. 4798 if (New) 4799 PushOnScopeChains(New, S); 4800 4801 return DeclPtrTy::make(New); 4802} 4803 4804void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 4805 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 4806 DeclPtrTy *Elements, unsigned NumElements) { 4807 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 4808 QualType EnumType = Context.getTypeDeclType(Enum); 4809 4810 // TODO: If the result value doesn't fit in an int, it must be a long or long 4811 // long value. ISO C does not support this, but GCC does as an extension, 4812 // emit a warning. 4813 unsigned IntWidth = Context.Target.getIntWidth(); 4814 4815 // Verify that all the values are okay, compute the size of the values, and 4816 // reverse the list. 4817 unsigned NumNegativeBits = 0; 4818 unsigned NumPositiveBits = 0; 4819 4820 // Keep track of whether all elements have type int. 4821 bool AllElementsInt = true; 4822 4823 for (unsigned i = 0; i != NumElements; ++i) { 4824 EnumConstantDecl *ECD = 4825 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 4826 if (!ECD) continue; // Already issued a diagnostic. 4827 4828 // If the enum value doesn't fit in an int, emit an extension warning. 4829 const llvm::APSInt &InitVal = ECD->getInitVal(); 4830 assert(InitVal.getBitWidth() >= IntWidth && 4831 "Should have promoted value to int"); 4832 if (InitVal.getBitWidth() > IntWidth) { 4833 llvm::APSInt V(InitVal); 4834 V.trunc(IntWidth); 4835 V.extend(InitVal.getBitWidth()); 4836 if (V != InitVal) 4837 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 4838 << InitVal.toString(10); 4839 } 4840 4841 // Keep track of the size of positive and negative values. 4842 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 4843 NumPositiveBits = std::max(NumPositiveBits, 4844 (unsigned)InitVal.getActiveBits()); 4845 else 4846 NumNegativeBits = std::max(NumNegativeBits, 4847 (unsigned)InitVal.getMinSignedBits()); 4848 4849 // Keep track of whether every enum element has type int (very commmon). 4850 if (AllElementsInt) 4851 AllElementsInt = ECD->getType() == Context.IntTy; 4852 } 4853 4854 // Figure out the type that should be used for this enum. 4855 // FIXME: Support attribute(packed) on enums and -fshort-enums. 4856 QualType BestType; 4857 unsigned BestWidth; 4858 4859 if (NumNegativeBits) { 4860 // If there is a negative value, figure out the smallest integer type (of 4861 // int/long/longlong) that fits. 4862 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 4863 BestType = Context.IntTy; 4864 BestWidth = IntWidth; 4865 } else { 4866 BestWidth = Context.Target.getLongWidth(); 4867 4868 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 4869 BestType = Context.LongTy; 4870 else { 4871 BestWidth = Context.Target.getLongLongWidth(); 4872 4873 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 4874 Diag(Enum->getLocation(), diag::warn_enum_too_large); 4875 BestType = Context.LongLongTy; 4876 } 4877 } 4878 } else { 4879 // If there is no negative value, figure out which of uint, ulong, ulonglong 4880 // fits. 4881 if (NumPositiveBits <= IntWidth) { 4882 BestType = Context.UnsignedIntTy; 4883 BestWidth = IntWidth; 4884 } else if (NumPositiveBits <= 4885 (BestWidth = Context.Target.getLongWidth())) { 4886 BestType = Context.UnsignedLongTy; 4887 } else { 4888 BestWidth = Context.Target.getLongLongWidth(); 4889 assert(NumPositiveBits <= BestWidth && 4890 "How could an initializer get larger than ULL?"); 4891 BestType = Context.UnsignedLongLongTy; 4892 } 4893 } 4894 4895 // Loop over all of the enumerator constants, changing their types to match 4896 // the type of the enum if needed. 4897 for (unsigned i = 0; i != NumElements; ++i) { 4898 EnumConstantDecl *ECD = 4899 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 4900 if (!ECD) continue; // Already issued a diagnostic. 4901 4902 // Standard C says the enumerators have int type, but we allow, as an 4903 // extension, the enumerators to be larger than int size. If each 4904 // enumerator value fits in an int, type it as an int, otherwise type it the 4905 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 4906 // that X has type 'int', not 'unsigned'. 4907 if (ECD->getType() == Context.IntTy) { 4908 // Make sure the init value is signed. 4909 llvm::APSInt IV = ECD->getInitVal(); 4910 IV.setIsSigned(true); 4911 ECD->setInitVal(IV); 4912 4913 if (getLangOptions().CPlusPlus) 4914 // C++ [dcl.enum]p4: Following the closing brace of an 4915 // enum-specifier, each enumerator has the type of its 4916 // enumeration. 4917 ECD->setType(EnumType); 4918 continue; // Already int type. 4919 } 4920 4921 // Determine whether the value fits into an int. 4922 llvm::APSInt InitVal = ECD->getInitVal(); 4923 bool FitsInInt; 4924 if (InitVal.isUnsigned() || !InitVal.isNegative()) 4925 FitsInInt = InitVal.getActiveBits() < IntWidth; 4926 else 4927 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 4928 4929 // If it fits into an integer type, force it. Otherwise force it to match 4930 // the enum decl type. 4931 QualType NewTy; 4932 unsigned NewWidth; 4933 bool NewSign; 4934 if (FitsInInt) { 4935 NewTy = Context.IntTy; 4936 NewWidth = IntWidth; 4937 NewSign = true; 4938 } else if (ECD->getType() == BestType) { 4939 // Already the right type! 4940 if (getLangOptions().CPlusPlus) 4941 // C++ [dcl.enum]p4: Following the closing brace of an 4942 // enum-specifier, each enumerator has the type of its 4943 // enumeration. 4944 ECD->setType(EnumType); 4945 continue; 4946 } else { 4947 NewTy = BestType; 4948 NewWidth = BestWidth; 4949 NewSign = BestType->isSignedIntegerType(); 4950 } 4951 4952 // Adjust the APSInt value. 4953 InitVal.extOrTrunc(NewWidth); 4954 InitVal.setIsSigned(NewSign); 4955 ECD->setInitVal(InitVal); 4956 4957 // Adjust the Expr initializer and type. 4958 if (ECD->getInitExpr()) 4959 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), 4960 /*isLvalue=*/false)); 4961 if (getLangOptions().CPlusPlus) 4962 // C++ [dcl.enum]p4: Following the closing brace of an 4963 // enum-specifier, each enumerator has the type of its 4964 // enumeration. 4965 ECD->setType(EnumType); 4966 else 4967 ECD->setType(NewTy); 4968 } 4969 4970 Enum->completeDefinition(Context, BestType); 4971} 4972 4973Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 4974 ExprArg expr) { 4975 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 4976 4977 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 4978 Loc, AsmString); 4979 CurContext->addDecl(New); 4980 return DeclPtrTy::make(New); 4981} 4982 4983void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 4984 SourceLocation PragmaLoc, 4985 SourceLocation NameLoc) { 4986 Decl *PrevDecl = LookupName(TUScope, Name, LookupOrdinaryName); 4987 4988 // FIXME: This implementation is an ugly hack! 4989 if (PrevDecl) { 4990 PrevDecl->addAttr(::new (Context) WeakAttr()); 4991 return; 4992 } 4993 Diag(PragmaLoc, diag::err_unsupported_pragma_weak); 4994 return; 4995} 4996 4997void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 4998 IdentifierInfo* AliasName, 4999 SourceLocation PragmaLoc, 5000 SourceLocation NameLoc, 5001 SourceLocation AliasNameLoc) { 5002 Decl *PrevDecl = LookupName(TUScope, Name, LookupOrdinaryName); 5003 5004 // FIXME: This implementation is an ugly hack! 5005 if (PrevDecl) { 5006 PrevDecl->addAttr(::new (Context) AliasAttr(AliasName->getName())); 5007 PrevDecl->addAttr(::new (Context) WeakAttr()); 5008 return; 5009 } 5010 Diag(PragmaLoc, diag::err_unsupported_pragma_weak); 5011 return; 5012} 5013