SemaDecl.cpp revision 00d50747e8442a4d0daf2dfc226aec354fd3441e
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/APValue.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclObjC.h" 19#include "clang/AST/DeclTemplate.h" 20#include "clang/AST/ExprCXX.h" 21#include "clang/Parse/DeclSpec.h" 22#include "clang/Basic/TargetInfo.h" 23#include "clang/Basic/SourceManager.h" 24// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 25#include "clang/Lex/Preprocessor.h" 26#include "clang/Lex/HeaderSearch.h" 27#include "llvm/ADT/SmallSet.h" 28#include "llvm/ADT/STLExtras.h" 29#include <algorithm> 30#include <functional> 31 32using namespace clang; 33 34/// \brief If the identifier refers to a type name within this scope, 35/// return the declaration of that type. 36/// 37/// This routine performs ordinary name lookup of the identifier II 38/// within the given scope, with optional C++ scope specifier SS, to 39/// determine whether the name refers to a type. If so, returns the 40/// declaration corresponding to that type. Otherwise, returns NULL. 41/// 42/// If name lookup results in an ambiguity, this routine will complain 43/// and then return NULL. 44Sema::DeclTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 45 Scope *S, const CXXScopeSpec *SS) { 46 Decl *IIDecl = 0; 47 LookupResult Result = LookupParsedName(S, SS, &II, LookupOrdinaryName, false); 48 switch (Result.getKind()) { 49 case LookupResult::NotFound: 50 case LookupResult::FoundOverloaded: 51 return 0; 52 53 case LookupResult::AmbiguousBaseSubobjectTypes: 54 case LookupResult::AmbiguousBaseSubobjects: 55 case LookupResult::AmbiguousReference: 56 DiagnoseAmbiguousLookup(Result, DeclarationName(&II), NameLoc); 57 return 0; 58 59 case LookupResult::Found: 60 IIDecl = Result.getAsDecl(); 61 break; 62 } 63 64 if (IIDecl) { 65 if (isa<TypedefDecl>(IIDecl) || 66 isa<ObjCInterfaceDecl>(IIDecl) || 67 isa<TagDecl>(IIDecl) || 68 isa<TemplateTypeParmDecl>(IIDecl)) 69 return IIDecl; 70 } 71 return 0; 72} 73 74DeclContext *Sema::getContainingDC(DeclContext *DC) { 75 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) { 76 // A C++ out-of-line method will return to the file declaration context. 77 if (MD->isOutOfLineDefinition()) 78 return MD->getLexicalDeclContext(); 79 80 // A C++ inline method is parsed *after* the topmost class it was declared in 81 // is fully parsed (it's "complete"). 82 // The parsing of a C++ inline method happens at the declaration context of 83 // the topmost (non-nested) class it is lexically declared in. 84 assert(isa<CXXRecordDecl>(MD->getParent()) && "C++ method not in Record."); 85 DC = MD->getParent(); 86 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 87 DC = RD; 88 89 // Return the declaration context of the topmost class the inline method is 90 // declared in. 91 return DC; 92 } 93 94 if (isa<ObjCMethodDecl>(DC)) 95 return Context.getTranslationUnitDecl(); 96 97 if (Decl *D = dyn_cast<Decl>(DC)) 98 return D->getLexicalDeclContext(); 99 100 return DC->getLexicalParent(); 101} 102 103void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 104 assert(getContainingDC(DC) == CurContext && 105 "The next DeclContext should be lexically contained in the current one."); 106 CurContext = DC; 107 S->setEntity(DC); 108} 109 110void Sema::PopDeclContext() { 111 assert(CurContext && "DeclContext imbalance!"); 112 113 CurContext = getContainingDC(CurContext); 114} 115 116/// Add this decl to the scope shadowed decl chains. 117void Sema::PushOnScopeChains(NamedDecl *D, Scope *S) { 118 // Move up the scope chain until we find the nearest enclosing 119 // non-transparent context. The declaration will be introduced into this 120 // scope. 121 while (S->getEntity() && 122 ((DeclContext *)S->getEntity())->isTransparentContext()) 123 S = S->getParent(); 124 125 S->AddDecl(D); 126 127 // Add scoped declarations into their context, so that they can be 128 // found later. Declarations without a context won't be inserted 129 // into any context. 130 CurContext->addDecl(D); 131 132 // C++ [basic.scope]p4: 133 // -- exactly one declaration shall declare a class name or 134 // enumeration name that is not a typedef name and the other 135 // declarations shall all refer to the same object or 136 // enumerator, or all refer to functions and function templates; 137 // in this case the class name or enumeration name is hidden. 138 if (TagDecl *TD = dyn_cast<TagDecl>(D)) { 139 // We are pushing the name of a tag (enum or class). 140 if (CurContext->getLookupContext() 141 == TD->getDeclContext()->getLookupContext()) { 142 // We're pushing the tag into the current context, which might 143 // require some reshuffling in the identifier resolver. 144 IdentifierResolver::iterator 145 I = IdResolver.begin(TD->getDeclName()), 146 IEnd = IdResolver.end(); 147 if (I != IEnd && isDeclInScope(*I, CurContext, S)) { 148 NamedDecl *PrevDecl = *I; 149 for (; I != IEnd && isDeclInScope(*I, CurContext, S); 150 PrevDecl = *I, ++I) { 151 if (TD->declarationReplaces(*I)) { 152 // This is a redeclaration. Remove it from the chain and 153 // break out, so that we'll add in the shadowed 154 // declaration. 155 S->RemoveDecl(*I); 156 if (PrevDecl == *I) { 157 IdResolver.RemoveDecl(*I); 158 IdResolver.AddDecl(TD); 159 return; 160 } else { 161 IdResolver.RemoveDecl(*I); 162 break; 163 } 164 } 165 } 166 167 // There is already a declaration with the same name in the same 168 // scope, which is not a tag declaration. It must be found 169 // before we find the new declaration, so insert the new 170 // declaration at the end of the chain. 171 IdResolver.AddShadowedDecl(TD, PrevDecl); 172 173 return; 174 } 175 } 176 } else if (getLangOptions().CPlusPlus && isa<FunctionDecl>(D)) { 177 // We are pushing the name of a function, which might be an 178 // overloaded name. 179 FunctionDecl *FD = cast<FunctionDecl>(D); 180 IdentifierResolver::iterator Redecl 181 = std::find_if(IdResolver.begin(FD->getDeclName()), 182 IdResolver.end(), 183 std::bind1st(std::mem_fun(&NamedDecl::declarationReplaces), 184 FD)); 185 if (Redecl != IdResolver.end()) { 186 // There is already a declaration of a function on our 187 // IdResolver chain. Replace it with this declaration. 188 S->RemoveDecl(*Redecl); 189 IdResolver.RemoveDecl(*Redecl); 190 } 191 } 192 193 IdResolver.AddDecl(D); 194} 195 196void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 197 if (S->decl_empty()) return; 198 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 199 "Scope shouldn't contain decls!"); 200 201 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 202 I != E; ++I) { 203 Decl *TmpD = static_cast<Decl*>(*I); 204 assert(TmpD && "This decl didn't get pushed??"); 205 206 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 207 NamedDecl *D = cast<NamedDecl>(TmpD); 208 209 if (!D->getDeclName()) continue; 210 211 // Remove this name from our lexical scope. 212 IdResolver.RemoveDecl(D); 213 } 214} 215 216/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 217/// return 0 if one not found. 218ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 219 // The third "scope" argument is 0 since we aren't enabling lazy built-in 220 // creation from this context. 221 NamedDecl *IDecl = LookupName(TUScope, Id, LookupOrdinaryName); 222 223 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 224} 225 226/// getNonFieldDeclScope - Retrieves the innermost scope, starting 227/// from S, where a non-field would be declared. This routine copes 228/// with the difference between C and C++ scoping rules in structs and 229/// unions. For example, the following code is well-formed in C but 230/// ill-formed in C++: 231/// @code 232/// struct S6 { 233/// enum { BAR } e; 234/// }; 235/// 236/// void test_S6() { 237/// struct S6 a; 238/// a.e = BAR; 239/// } 240/// @endcode 241/// For the declaration of BAR, this routine will return a different 242/// scope. The scope S will be the scope of the unnamed enumeration 243/// within S6. In C++, this routine will return the scope associated 244/// with S6, because the enumeration's scope is a transparent 245/// context but structures can contain non-field names. In C, this 246/// routine will return the translation unit scope, since the 247/// enumeration's scope is a transparent context and structures cannot 248/// contain non-field names. 249Scope *Sema::getNonFieldDeclScope(Scope *S) { 250 while (((S->getFlags() & Scope::DeclScope) == 0) || 251 (S->getEntity() && 252 ((DeclContext *)S->getEntity())->isTransparentContext()) || 253 (S->isClassScope() && !getLangOptions().CPlusPlus)) 254 S = S->getParent(); 255 return S; 256} 257 258void Sema::InitBuiltinVaListType() { 259 if (!Context.getBuiltinVaListType().isNull()) 260 return; 261 262 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 263 NamedDecl *VaDecl = LookupName(TUScope, VaIdent, LookupOrdinaryName); 264 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 265 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 266} 267 268/// LazilyCreateBuiltin - The specified Builtin-ID was first used at file scope. 269/// lazily create a decl for it. 270NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 271 Scope *S) { 272 Builtin::ID BID = (Builtin::ID)bid; 273 274 if (Context.BuiltinInfo.hasVAListUse(BID)) 275 InitBuiltinVaListType(); 276 277 QualType R = Context.BuiltinInfo.GetBuiltinType(BID, Context); 278 FunctionDecl *New = FunctionDecl::Create(Context, 279 Context.getTranslationUnitDecl(), 280 SourceLocation(), II, R, 281 FunctionDecl::Extern, false); 282 283 // Create Decl objects for each parameter, adding them to the 284 // FunctionDecl. 285 if (FunctionTypeProto *FT = dyn_cast<FunctionTypeProto>(R)) { 286 llvm::SmallVector<ParmVarDecl*, 16> Params; 287 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 288 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 289 FT->getArgType(i), VarDecl::None, 0)); 290 New->setParams(Context, &Params[0], Params.size()); 291 } 292 293 294 295 // TUScope is the translation-unit scope to insert this function into. 296 // FIXME: This is hideous. We need to teach PushOnScopeChains to 297 // relate Scopes to DeclContexts, and probably eliminate CurContext 298 // entirely, but we're not there yet. 299 DeclContext *SavedContext = CurContext; 300 CurContext = Context.getTranslationUnitDecl(); 301 PushOnScopeChains(New, TUScope); 302 CurContext = SavedContext; 303 return New; 304} 305 306/// GetStdNamespace - This method gets the C++ "std" namespace. This is where 307/// everything from the standard library is defined. 308NamespaceDecl *Sema::GetStdNamespace() { 309 if (!StdNamespace) { 310 IdentifierInfo *StdIdent = &PP.getIdentifierTable().get("std"); 311 DeclContext *Global = Context.getTranslationUnitDecl(); 312 Decl *Std = LookupQualifiedName(Global, StdIdent, LookupNamespaceName); 313 StdNamespace = dyn_cast_or_null<NamespaceDecl>(Std); 314 } 315 return StdNamespace; 316} 317 318/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the same name 319/// and scope as a previous declaration 'Old'. Figure out how to resolve this 320/// situation, merging decls or emitting diagnostics as appropriate. 321/// 322TypedefDecl *Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 323 bool objc_types = false; 324 // Allow multiple definitions for ObjC built-in typedefs. 325 // FIXME: Verify the underlying types are equivalent! 326 if (getLangOptions().ObjC1) { 327 const IdentifierInfo *TypeID = New->getIdentifier(); 328 switch (TypeID->getLength()) { 329 default: break; 330 case 2: 331 if (!TypeID->isStr("id")) 332 break; 333 Context.setObjCIdType(New); 334 objc_types = true; 335 break; 336 case 5: 337 if (!TypeID->isStr("Class")) 338 break; 339 Context.setObjCClassType(New); 340 objc_types = true; 341 return New; 342 case 3: 343 if (!TypeID->isStr("SEL")) 344 break; 345 Context.setObjCSelType(New); 346 objc_types = true; 347 return New; 348 case 8: 349 if (!TypeID->isStr("Protocol")) 350 break; 351 Context.setObjCProtoType(New->getUnderlyingType()); 352 objc_types = true; 353 return New; 354 } 355 // Fall through - the typedef name was not a builtin type. 356 } 357 // Verify the old decl was also a type. 358 TypeDecl *Old = dyn_cast<TypeDecl>(OldD); 359 if (!Old) { 360 Diag(New->getLocation(), diag::err_redefinition_different_kind) 361 << New->getDeclName(); 362 if (!objc_types) 363 Diag(OldD->getLocation(), diag::note_previous_definition); 364 return New; 365 } 366 367 // Determine the "old" type we'll use for checking and diagnostics. 368 QualType OldType; 369 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 370 OldType = OldTypedef->getUnderlyingType(); 371 else 372 OldType = Context.getTypeDeclType(Old); 373 374 // If the typedef types are not identical, reject them in all languages and 375 // with any extensions enabled. 376 377 if (OldType != New->getUnderlyingType() && 378 Context.getCanonicalType(OldType) != 379 Context.getCanonicalType(New->getUnderlyingType())) { 380 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 381 << New->getUnderlyingType() << OldType; 382 if (!objc_types) 383 Diag(Old->getLocation(), diag::note_previous_definition); 384 return New; 385 } 386 if (objc_types) return New; 387 if (getLangOptions().Microsoft) return New; 388 389 // C++ [dcl.typedef]p2: 390 // In a given non-class scope, a typedef specifier can be used to 391 // redefine the name of any type declared in that scope to refer 392 // to the type to which it already refers. 393 if (getLangOptions().CPlusPlus && !isa<CXXRecordDecl>(CurContext)) 394 return New; 395 396 // In C, redeclaration of a type is a constraint violation (6.7.2.3p1). 397 // Apparently GCC, Intel, and Sun all silently ignore the redeclaration if 398 // *either* declaration is in a system header. The code below implements 399 // this adhoc compatibility rule. FIXME: The following code will not 400 // work properly when compiling ".i" files (containing preprocessed output). 401 if (PP.getDiagnostics().getSuppressSystemWarnings()) { 402 SourceManager &SrcMgr = Context.getSourceManager(); 403 if (SrcMgr.isInSystemHeader(Old->getLocation())) 404 return New; 405 if (SrcMgr.isInSystemHeader(New->getLocation())) 406 return New; 407 } 408 409 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 410 Diag(Old->getLocation(), diag::note_previous_definition); 411 return New; 412} 413 414/// DeclhasAttr - returns true if decl Declaration already has the target 415/// attribute. 416static bool DeclHasAttr(const Decl *decl, const Attr *target) { 417 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 418 if (attr->getKind() == target->getKind()) 419 return true; 420 421 return false; 422} 423 424/// MergeAttributes - append attributes from the Old decl to the New one. 425static void MergeAttributes(Decl *New, Decl *Old) { 426 Attr *attr = const_cast<Attr*>(Old->getAttrs()), *tmp; 427 428 while (attr) { 429 tmp = attr; 430 attr = attr->getNext(); 431 432 if (!DeclHasAttr(New, tmp)) { 433 tmp->setInherited(true); 434 New->addAttr(tmp); 435 } else { 436 tmp->setNext(0); 437 delete(tmp); 438 } 439 } 440 441 Old->invalidateAttrs(); 442} 443 444/// MergeFunctionDecl - We just parsed a function 'New' from 445/// declarator D which has the same name and scope as a previous 446/// declaration 'Old'. Figure out how to resolve this situation, 447/// merging decls or emitting diagnostics as appropriate. 448/// Redeclaration will be set true if this New is a redeclaration OldD. 449/// 450/// In C++, New and Old must be declarations that are not 451/// overloaded. Use IsOverload to determine whether New and Old are 452/// overloaded, and to select the Old declaration that New should be 453/// merged with. 454FunctionDecl * 455Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD, bool &Redeclaration) { 456 assert(!isa<OverloadedFunctionDecl>(OldD) && 457 "Cannot merge with an overloaded function declaration"); 458 459 Redeclaration = false; 460 // Verify the old decl was also a function. 461 FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); 462 if (!Old) { 463 Diag(New->getLocation(), diag::err_redefinition_different_kind) 464 << New->getDeclName(); 465 Diag(OldD->getLocation(), diag::note_previous_definition); 466 return New; 467 } 468 469 // Determine whether the previous declaration was a definition, 470 // implicit declaration, or a declaration. 471 diag::kind PrevDiag; 472 if (Old->isThisDeclarationADefinition()) 473 PrevDiag = diag::note_previous_definition; 474 else if (Old->isImplicit()) 475 PrevDiag = diag::note_previous_implicit_declaration; 476 else 477 PrevDiag = diag::note_previous_declaration; 478 479 QualType OldQType = Context.getCanonicalType(Old->getType()); 480 QualType NewQType = Context.getCanonicalType(New->getType()); 481 482 if (getLangOptions().CPlusPlus) { 483 // (C++98 13.1p2): 484 // Certain function declarations cannot be overloaded: 485 // -- Function declarations that differ only in the return type 486 // cannot be overloaded. 487 QualType OldReturnType 488 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 489 QualType NewReturnType 490 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 491 if (OldReturnType != NewReturnType) { 492 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 493 Diag(Old->getLocation(), PrevDiag); 494 Redeclaration = true; 495 return New; 496 } 497 498 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 499 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 500 if (OldMethod && NewMethod) { 501 // -- Member function declarations with the same name and the 502 // same parameter types cannot be overloaded if any of them 503 // is a static member function declaration. 504 if (OldMethod->isStatic() || NewMethod->isStatic()) { 505 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 506 Diag(Old->getLocation(), PrevDiag); 507 return New; 508 } 509 510 // C++ [class.mem]p1: 511 // [...] A member shall not be declared twice in the 512 // member-specification, except that a nested class or member 513 // class template can be declared and then later defined. 514 if (OldMethod->getLexicalDeclContext() == 515 NewMethod->getLexicalDeclContext()) { 516 unsigned NewDiag; 517 if (isa<CXXConstructorDecl>(OldMethod)) 518 NewDiag = diag::err_constructor_redeclared; 519 else if (isa<CXXDestructorDecl>(NewMethod)) 520 NewDiag = diag::err_destructor_redeclared; 521 else if (isa<CXXConversionDecl>(NewMethod)) 522 NewDiag = diag::err_conv_function_redeclared; 523 else 524 NewDiag = diag::err_member_redeclared; 525 526 Diag(New->getLocation(), NewDiag); 527 Diag(Old->getLocation(), PrevDiag); 528 } 529 } 530 531 // (C++98 8.3.5p3): 532 // All declarations for a function shall agree exactly in both the 533 // return type and the parameter-type-list. 534 if (OldQType == NewQType) { 535 // We have a redeclaration. 536 MergeAttributes(New, Old); 537 Redeclaration = true; 538 return MergeCXXFunctionDecl(New, Old); 539 } 540 541 // Fall through for conflicting redeclarations and redefinitions. 542 } 543 544 // C: Function types need to be compatible, not identical. This handles 545 // duplicate function decls like "void f(int); void f(enum X);" properly. 546 if (!getLangOptions().CPlusPlus && 547 Context.typesAreCompatible(OldQType, NewQType)) { 548 MergeAttributes(New, Old); 549 Redeclaration = true; 550 return New; 551 } 552 553 // A function that has already been declared has been redeclared or defined 554 // with a different type- show appropriate diagnostic 555 556 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 557 // TODO: This is totally simplistic. It should handle merging functions 558 // together etc, merging extern int X; int X; ... 559 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 560 Diag(Old->getLocation(), PrevDiag); 561 return New; 562} 563 564/// Predicate for C "tentative" external object definitions (C99 6.9.2). 565static bool isTentativeDefinition(VarDecl *VD) { 566 if (VD->isFileVarDecl()) 567 return (!VD->getInit() && 568 (VD->getStorageClass() == VarDecl::None || 569 VD->getStorageClass() == VarDecl::Static)); 570 return false; 571} 572 573/// CheckForFileScopedRedefinitions - Make sure we forgo redefinition errors 574/// when dealing with C "tentative" external object definitions (C99 6.9.2). 575void Sema::CheckForFileScopedRedefinitions(Scope *S, VarDecl *VD) { 576 bool VDIsTentative = isTentativeDefinition(VD); 577 bool VDIsIncompleteArray = VD->getType()->isIncompleteArrayType(); 578 579 // FIXME: I don't think this will actually see all of the 580 // redefinitions. Can't we check this property on-the-fly? 581 for (IdentifierResolver::iterator I = IdResolver.begin(VD->getIdentifier()), 582 E = IdResolver.end(); 583 I != E; ++I) { 584 if (*I != VD && isDeclInScope(*I, VD->getDeclContext(), S)) { 585 VarDecl *OldDecl = dyn_cast<VarDecl>(*I); 586 587 // Handle the following case: 588 // int a[10]; 589 // int a[]; - the code below makes sure we set the correct type. 590 // int a[11]; - this is an error, size isn't 10. 591 if (OldDecl && VDIsTentative && VDIsIncompleteArray && 592 OldDecl->getType()->isConstantArrayType()) 593 VD->setType(OldDecl->getType()); 594 595 // Check for "tentative" definitions. We can't accomplish this in 596 // MergeVarDecl since the initializer hasn't been attached. 597 if (!OldDecl || isTentativeDefinition(OldDecl) || VDIsTentative) 598 continue; 599 600 // Handle __private_extern__ just like extern. 601 if (OldDecl->getStorageClass() != VarDecl::Extern && 602 OldDecl->getStorageClass() != VarDecl::PrivateExtern && 603 VD->getStorageClass() != VarDecl::Extern && 604 VD->getStorageClass() != VarDecl::PrivateExtern) { 605 Diag(VD->getLocation(), diag::err_redefinition) << VD->getDeclName(); 606 Diag(OldDecl->getLocation(), diag::note_previous_definition); 607 // One redefinition error is enough. 608 break; 609 } 610 } 611 } 612} 613 614/// MergeVarDecl - We just parsed a variable 'New' which has the same name 615/// and scope as a previous declaration 'Old'. Figure out how to resolve this 616/// situation, merging decls or emitting diagnostics as appropriate. 617/// 618/// Tentative definition rules (C99 6.9.2p2) are checked by 619/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 620/// definitions here, since the initializer hasn't been attached. 621/// 622VarDecl *Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 623 // Verify the old decl was also a variable. 624 VarDecl *Old = dyn_cast<VarDecl>(OldD); 625 if (!Old) { 626 Diag(New->getLocation(), diag::err_redefinition_different_kind) 627 << New->getDeclName(); 628 Diag(OldD->getLocation(), diag::note_previous_definition); 629 return New; 630 } 631 632 MergeAttributes(New, Old); 633 634 // Merge the types 635 QualType MergedT = Context.mergeTypes(New->getType(), Old->getType()); 636 if (MergedT.isNull()) { 637 Diag(New->getLocation(), diag::err_redefinition_different_type) 638 << New->getDeclName(); 639 Diag(Old->getLocation(), diag::note_previous_definition); 640 return New; 641 } 642 New->setType(MergedT); 643 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 644 if (New->getStorageClass() == VarDecl::Static && 645 (Old->getStorageClass() == VarDecl::None || 646 Old->getStorageClass() == VarDecl::Extern)) { 647 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 648 Diag(Old->getLocation(), diag::note_previous_definition); 649 return New; 650 } 651 // C99 6.2.2p4: Check if we have a non-static decl followed by a static. 652 if (New->getStorageClass() != VarDecl::Static && 653 Old->getStorageClass() == VarDecl::Static) { 654 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 655 Diag(Old->getLocation(), diag::note_previous_definition); 656 return New; 657 } 658 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 659 if (New->getStorageClass() != VarDecl::Extern && !New->isFileVarDecl()) { 660 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 661 Diag(Old->getLocation(), diag::note_previous_definition); 662 } 663 return New; 664} 665 666/// CheckParmsForFunctionDef - Check that the parameters of the given 667/// function are appropriate for the definition of a function. This 668/// takes care of any checks that cannot be performed on the 669/// declaration itself, e.g., that the types of each of the function 670/// parameters are complete. 671bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 672 bool HasInvalidParm = false; 673 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 674 ParmVarDecl *Param = FD->getParamDecl(p); 675 676 // C99 6.7.5.3p4: the parameters in a parameter type list in a 677 // function declarator that is part of a function definition of 678 // that function shall not have incomplete type. 679 if (!Param->isInvalidDecl() && 680 DiagnoseIncompleteType(Param->getLocation(), Param->getType(), 681 diag::err_typecheck_decl_incomplete_type)) { 682 Param->setInvalidDecl(); 683 HasInvalidParm = true; 684 } 685 686 // C99 6.9.1p5: If the declarator includes a parameter type list, the 687 // declaration of each parameter shall include an identifier. 688 if (Param->getIdentifier() == 0 && !getLangOptions().CPlusPlus) 689 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 690 } 691 692 return HasInvalidParm; 693} 694 695/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 696/// no declarator (e.g. "struct foo;") is parsed. 697Sema::DeclTy *Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 698 TagDecl *Tag 699 = dyn_cast_or_null<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 700 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 701 if (!Record->getDeclName() && Record->isDefinition() && 702 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 703 return BuildAnonymousStructOrUnion(S, DS, Record); 704 705 // Microsoft allows unnamed struct/union fields. Don't complain 706 // about them. 707 // FIXME: Should we support Microsoft's extensions in this area? 708 if (Record->getDeclName() && getLangOptions().Microsoft) 709 return Tag; 710 } 711 712 if (!DS.isMissingDeclaratorOk() && 713 DS.getTypeSpecType() != DeclSpec::TST_error) { 714 // Warn about typedefs of enums without names, since this is an 715 // extension in both Microsoft an GNU. 716 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 717 Tag && isa<EnumDecl>(Tag)) { 718 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 719 << DS.getSourceRange(); 720 return Tag; 721 } 722 723 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 724 << DS.getSourceRange(); 725 return 0; 726 } 727 728 return Tag; 729} 730 731/// InjectAnonymousStructOrUnionMembers - Inject the members of the 732/// anonymous struct or union AnonRecord into the owning context Owner 733/// and scope S. This routine will be invoked just after we realize 734/// that an unnamed union or struct is actually an anonymous union or 735/// struct, e.g., 736/// 737/// @code 738/// union { 739/// int i; 740/// float f; 741/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 742/// // f into the surrounding scope.x 743/// @endcode 744/// 745/// This routine is recursive, injecting the names of nested anonymous 746/// structs/unions into the owning context and scope as well. 747bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 748 RecordDecl *AnonRecord) { 749 bool Invalid = false; 750 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 751 FEnd = AnonRecord->field_end(); 752 F != FEnd; ++F) { 753 if ((*F)->getDeclName()) { 754 NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 755 LookupOrdinaryName, true); 756 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 757 // C++ [class.union]p2: 758 // The names of the members of an anonymous union shall be 759 // distinct from the names of any other entity in the 760 // scope in which the anonymous union is declared. 761 unsigned diagKind 762 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 763 : diag::err_anonymous_struct_member_redecl; 764 Diag((*F)->getLocation(), diagKind) 765 << (*F)->getDeclName(); 766 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 767 Invalid = true; 768 } else { 769 // C++ [class.union]p2: 770 // For the purpose of name lookup, after the anonymous union 771 // definition, the members of the anonymous union are 772 // considered to have been defined in the scope in which the 773 // anonymous union is declared. 774 Owner->makeDeclVisibleInContext(*F); 775 S->AddDecl(*F); 776 IdResolver.AddDecl(*F); 777 } 778 } else if (const RecordType *InnerRecordType 779 = (*F)->getType()->getAsRecordType()) { 780 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 781 if (InnerRecord->isAnonymousStructOrUnion()) 782 Invalid = Invalid || 783 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 784 } 785 } 786 787 return Invalid; 788} 789 790/// ActOnAnonymousStructOrUnion - Handle the declaration of an 791/// anonymous structure or union. Anonymous unions are a C++ feature 792/// (C++ [class.union]) and a GNU C extension; anonymous structures 793/// are a GNU C and GNU C++ extension. 794Sema::DeclTy *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 795 RecordDecl *Record) { 796 DeclContext *Owner = Record->getDeclContext(); 797 798 // Diagnose whether this anonymous struct/union is an extension. 799 if (Record->isUnion() && !getLangOptions().CPlusPlus) 800 Diag(Record->getLocation(), diag::ext_anonymous_union); 801 else if (!Record->isUnion()) 802 Diag(Record->getLocation(), diag::ext_anonymous_struct); 803 804 // C and C++ require different kinds of checks for anonymous 805 // structs/unions. 806 bool Invalid = false; 807 if (getLangOptions().CPlusPlus) { 808 const char* PrevSpec = 0; 809 // C++ [class.union]p3: 810 // Anonymous unions declared in a named namespace or in the 811 // global namespace shall be declared static. 812 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 813 (isa<TranslationUnitDecl>(Owner) || 814 (isa<NamespaceDecl>(Owner) && 815 cast<NamespaceDecl>(Owner)->getDeclName()))) { 816 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 817 Invalid = true; 818 819 // Recover by adding 'static'. 820 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); 821 } 822 // C++ [class.union]p3: 823 // A storage class is not allowed in a declaration of an 824 // anonymous union in a class scope. 825 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 826 isa<RecordDecl>(Owner)) { 827 Diag(DS.getStorageClassSpecLoc(), 828 diag::err_anonymous_union_with_storage_spec); 829 Invalid = true; 830 831 // Recover by removing the storage specifier. 832 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 833 PrevSpec); 834 } 835 836 // C++ [class.union]p2: 837 // The member-specification of an anonymous union shall only 838 // define non-static data members. [Note: nested types and 839 // functions cannot be declared within an anonymous union. ] 840 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 841 MemEnd = Record->decls_end(); 842 Mem != MemEnd; ++Mem) { 843 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 844 // C++ [class.union]p3: 845 // An anonymous union shall not have private or protected 846 // members (clause 11). 847 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 848 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 849 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 850 Invalid = true; 851 } 852 } else if ((*Mem)->isImplicit()) { 853 // Any implicit members are fine. 854 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 855 // This is a type that showed up in an 856 // elaborated-type-specifier inside the anonymous struct or 857 // union, but which actually declares a type outside of the 858 // anonymous struct or union. It's okay. 859 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 860 if (!MemRecord->isAnonymousStructOrUnion() && 861 MemRecord->getDeclName()) { 862 // This is a nested type declaration. 863 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 864 << (int)Record->isUnion(); 865 Invalid = true; 866 } 867 } else { 868 // We have something that isn't a non-static data 869 // member. Complain about it. 870 unsigned DK = diag::err_anonymous_record_bad_member; 871 if (isa<TypeDecl>(*Mem)) 872 DK = diag::err_anonymous_record_with_type; 873 else if (isa<FunctionDecl>(*Mem)) 874 DK = diag::err_anonymous_record_with_function; 875 else if (isa<VarDecl>(*Mem)) 876 DK = diag::err_anonymous_record_with_static; 877 Diag((*Mem)->getLocation(), DK) 878 << (int)Record->isUnion(); 879 Invalid = true; 880 } 881 } 882 } else { 883 // FIXME: Check GNU C semantics 884 if (Record->isUnion() && !Owner->isRecord()) { 885 Diag(Record->getLocation(), diag::err_anonymous_union_not_member) 886 << (int)getLangOptions().CPlusPlus; 887 Invalid = true; 888 } 889 } 890 891 if (!Record->isUnion() && !Owner->isRecord()) { 892 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 893 << (int)getLangOptions().CPlusPlus; 894 Invalid = true; 895 } 896 897 // Create a declaration for this anonymous struct/union. 898 NamedDecl *Anon = 0; 899 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 900 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 901 /*IdentifierInfo=*/0, 902 Context.getTypeDeclType(Record), 903 /*BitWidth=*/0, /*Mutable=*/false); 904 Anon->setAccess(AS_public); 905 if (getLangOptions().CPlusPlus) 906 FieldCollector->Add(cast<FieldDecl>(Anon)); 907 } else { 908 VarDecl::StorageClass SC; 909 switch (DS.getStorageClassSpec()) { 910 default: assert(0 && "Unknown storage class!"); 911 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 912 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 913 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 914 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 915 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 916 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 917 case DeclSpec::SCS_mutable: 918 // mutable can only appear on non-static class members, so it's always 919 // an error here 920 Diag(Record->getLocation(), diag::err_mutable_nonmember); 921 Invalid = true; 922 SC = VarDecl::None; 923 break; 924 } 925 926 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 927 /*IdentifierInfo=*/0, 928 Context.getTypeDeclType(Record), 929 SC, DS.getSourceRange().getBegin()); 930 } 931 Anon->setImplicit(); 932 933 // Add the anonymous struct/union object to the current 934 // context. We'll be referencing this object when we refer to one of 935 // its members. 936 Owner->addDecl(Anon); 937 938 // Inject the members of the anonymous struct/union into the owning 939 // context and into the identifier resolver chain for name lookup 940 // purposes. 941 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 942 Invalid = true; 943 944 // Mark this as an anonymous struct/union type. Note that we do not 945 // do this until after we have already checked and injected the 946 // members of this anonymous struct/union type, because otherwise 947 // the members could be injected twice: once by DeclContext when it 948 // builds its lookup table, and once by 949 // InjectAnonymousStructOrUnionMembers. 950 Record->setAnonymousStructOrUnion(true); 951 952 if (Invalid) 953 Anon->setInvalidDecl(); 954 955 return Anon; 956} 957 958bool Sema::CheckSingleInitializer(Expr *&Init, QualType DeclType, 959 bool DirectInit) { 960 // Get the type before calling CheckSingleAssignmentConstraints(), since 961 // it can promote the expression. 962 QualType InitType = Init->getType(); 963 964 if (getLangOptions().CPlusPlus) { 965 // FIXME: I dislike this error message. A lot. 966 if (PerformImplicitConversion(Init, DeclType, "initializing", DirectInit)) 967 return Diag(Init->getSourceRange().getBegin(), 968 diag::err_typecheck_convert_incompatible) 969 << DeclType << Init->getType() << "initializing" 970 << Init->getSourceRange(); 971 972 return false; 973 } 974 975 AssignConvertType ConvTy = CheckSingleAssignmentConstraints(DeclType, Init); 976 return DiagnoseAssignmentResult(ConvTy, Init->getLocStart(), DeclType, 977 InitType, Init, "initializing"); 978} 979 980bool Sema::CheckStringLiteralInit(StringLiteral *strLiteral, QualType &DeclT) { 981 const ArrayType *AT = Context.getAsArrayType(DeclT); 982 983 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) { 984 // C99 6.7.8p14. We have an array of character type with unknown size 985 // being initialized to a string literal. 986 llvm::APSInt ConstVal(32); 987 ConstVal = strLiteral->getByteLength() + 1; 988 // Return a new array type (C99 6.7.8p22). 989 DeclT = Context.getConstantArrayType(IAT->getElementType(), ConstVal, 990 ArrayType::Normal, 0); 991 } else { 992 const ConstantArrayType *CAT = cast<ConstantArrayType>(AT); 993 // C99 6.7.8p14. We have an array of character type with known size. 994 // FIXME: Avoid truncation for 64-bit length strings. 995 if (strLiteral->getByteLength() > (unsigned)CAT->getSize().getZExtValue()) 996 Diag(strLiteral->getSourceRange().getBegin(), 997 diag::warn_initializer_string_for_char_array_too_long) 998 << strLiteral->getSourceRange(); 999 } 1000 // Set type from "char *" to "constant array of char". 1001 strLiteral->setType(DeclT); 1002 // For now, we always return false (meaning success). 1003 return false; 1004} 1005 1006StringLiteral *Sema::IsStringLiteralInit(Expr *Init, QualType DeclType) { 1007 const ArrayType *AT = Context.getAsArrayType(DeclType); 1008 if (AT && AT->getElementType()->isCharType()) { 1009 return dyn_cast<StringLiteral>(Init->IgnoreParens()); 1010 } 1011 return 0; 1012} 1013 1014bool Sema::CheckInitializerTypes(Expr *&Init, QualType &DeclType, 1015 SourceLocation InitLoc, 1016 DeclarationName InitEntity, 1017 bool DirectInit) { 1018 if (DeclType->isDependentType() || Init->isTypeDependent()) 1019 return false; 1020 1021 // C++ [dcl.init.ref]p1: 1022 // A variable declared to be a T&, that is "reference to type T" 1023 // (8.3.2), shall be initialized by an object, or function, of 1024 // type T or by an object that can be converted into a T. 1025 if (DeclType->isReferenceType()) 1026 return CheckReferenceInit(Init, DeclType, 0, false, DirectInit); 1027 1028 // C99 6.7.8p3: The type of the entity to be initialized shall be an array 1029 // of unknown size ("[]") or an object type that is not a variable array type. 1030 if (const VariableArrayType *VAT = Context.getAsVariableArrayType(DeclType)) 1031 return Diag(InitLoc, diag::err_variable_object_no_init) 1032 << VAT->getSizeExpr()->getSourceRange(); 1033 1034 InitListExpr *InitList = dyn_cast<InitListExpr>(Init); 1035 if (!InitList) { 1036 // FIXME: Handle wide strings 1037 if (StringLiteral *strLiteral = IsStringLiteralInit(Init, DeclType)) 1038 return CheckStringLiteralInit(strLiteral, DeclType); 1039 1040 // C++ [dcl.init]p14: 1041 // -- If the destination type is a (possibly cv-qualified) class 1042 // type: 1043 if (getLangOptions().CPlusPlus && DeclType->isRecordType()) { 1044 QualType DeclTypeC = Context.getCanonicalType(DeclType); 1045 QualType InitTypeC = Context.getCanonicalType(Init->getType()); 1046 1047 // -- If the initialization is direct-initialization, or if it is 1048 // copy-initialization where the cv-unqualified version of the 1049 // source type is the same class as, or a derived class of, the 1050 // class of the destination, constructors are considered. 1051 if ((DeclTypeC.getUnqualifiedType() == InitTypeC.getUnqualifiedType()) || 1052 IsDerivedFrom(InitTypeC, DeclTypeC)) { 1053 CXXConstructorDecl *Constructor 1054 = PerformInitializationByConstructor(DeclType, &Init, 1, 1055 InitLoc, Init->getSourceRange(), 1056 InitEntity, 1057 DirectInit? IK_Direct : IK_Copy); 1058 return Constructor == 0; 1059 } 1060 1061 // -- Otherwise (i.e., for the remaining copy-initialization 1062 // cases), user-defined conversion sequences that can 1063 // convert from the source type to the destination type or 1064 // (when a conversion function is used) to a derived class 1065 // thereof are enumerated as described in 13.3.1.4, and the 1066 // best one is chosen through overload resolution 1067 // (13.3). If the conversion cannot be done or is 1068 // ambiguous, the initialization is ill-formed. The 1069 // function selected is called with the initializer 1070 // expression as its argument; if the function is a 1071 // constructor, the call initializes a temporary of the 1072 // destination type. 1073 // FIXME: We're pretending to do copy elision here; return to 1074 // this when we have ASTs for such things. 1075 if (!PerformImplicitConversion(Init, DeclType, "initializing")) 1076 return false; 1077 1078 if (InitEntity) 1079 return Diag(InitLoc, diag::err_cannot_initialize_decl) 1080 << InitEntity << (int)(Init->isLvalue(Context) == Expr::LV_Valid) 1081 << Init->getType() << Init->getSourceRange(); 1082 else 1083 return Diag(InitLoc, diag::err_cannot_initialize_decl_noname) 1084 << DeclType << (int)(Init->isLvalue(Context) == Expr::LV_Valid) 1085 << Init->getType() << Init->getSourceRange(); 1086 } 1087 1088 // C99 6.7.8p16. 1089 if (DeclType->isArrayType()) 1090 return Diag(Init->getLocStart(), diag::err_array_init_list_required) 1091 << Init->getSourceRange(); 1092 1093 return CheckSingleInitializer(Init, DeclType, DirectInit); 1094 } 1095 1096 bool hadError = CheckInitList(InitList, DeclType); 1097 Init = InitList; 1098 return hadError; 1099} 1100 1101/// GetNameForDeclarator - Determine the full declaration name for the 1102/// given Declarator. 1103DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1104 switch (D.getKind()) { 1105 case Declarator::DK_Abstract: 1106 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 1107 return DeclarationName(); 1108 1109 case Declarator::DK_Normal: 1110 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 1111 return DeclarationName(D.getIdentifier()); 1112 1113 case Declarator::DK_Constructor: { 1114 QualType Ty = Context.getTypeDeclType((TypeDecl *)D.getDeclaratorIdType()); 1115 Ty = Context.getCanonicalType(Ty); 1116 return Context.DeclarationNames.getCXXConstructorName(Ty); 1117 } 1118 1119 case Declarator::DK_Destructor: { 1120 QualType Ty = Context.getTypeDeclType((TypeDecl *)D.getDeclaratorIdType()); 1121 Ty = Context.getCanonicalType(Ty); 1122 return Context.DeclarationNames.getCXXDestructorName(Ty); 1123 } 1124 1125 case Declarator::DK_Conversion: { 1126 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1127 Ty = Context.getCanonicalType(Ty); 1128 return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 1129 } 1130 1131 case Declarator::DK_Operator: 1132 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 1133 return Context.DeclarationNames.getCXXOperatorName( 1134 D.getOverloadedOperator()); 1135 } 1136 1137 assert(false && "Unknown name kind"); 1138 return DeclarationName(); 1139} 1140 1141/// isNearlyMatchingFunction - Determine whether the C++ functions 1142/// Declaration and Definition are "nearly" matching. This heuristic 1143/// is used to improve diagnostics in the case where an out-of-line 1144/// function definition doesn't match any declaration within 1145/// the class or namespace. 1146static bool isNearlyMatchingFunction(ASTContext &Context, 1147 FunctionDecl *Declaration, 1148 FunctionDecl *Definition) { 1149 if (Declaration->param_size() != Definition->param_size()) 1150 return false; 1151 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1152 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1153 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1154 1155 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1156 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 1157 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1158 return false; 1159 } 1160 1161 return true; 1162} 1163 1164Sema::DeclTy * 1165Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl, 1166 bool IsFunctionDefinition) { 1167 NamedDecl *LastDeclarator = dyn_cast_or_null<NamedDecl>((Decl *)lastDecl); 1168 DeclarationName Name = GetNameForDeclarator(D); 1169 1170 // All of these full declarators require an identifier. If it doesn't have 1171 // one, the ParsedFreeStandingDeclSpec action should be used. 1172 if (!Name) { 1173 if (!D.getInvalidType()) // Reject this if we think it is valid. 1174 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1175 diag::err_declarator_need_ident) 1176 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1177 return 0; 1178 } 1179 1180 // The scope passed in may not be a decl scope. Zip up the scope tree until 1181 // we find one that is. 1182 while ((S->getFlags() & Scope::DeclScope) == 0 || 1183 (S->getFlags() & Scope::TemplateParamScope) != 0) 1184 S = S->getParent(); 1185 1186 DeclContext *DC; 1187 NamedDecl *PrevDecl; 1188 NamedDecl *New; 1189 bool InvalidDecl = false; 1190 1191 // See if this is a redefinition of a variable in the same scope. 1192 if (!D.getCXXScopeSpec().isSet() && !D.getCXXScopeSpec().isInvalid()) { 1193 DC = CurContext; 1194 PrevDecl = LookupName(S, Name, LookupOrdinaryName); 1195 } else { // Something like "int foo::x;" 1196 DC = static_cast<DeclContext*>(D.getCXXScopeSpec().getScopeRep()); 1197 PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName); 1198 1199 // C++ 7.3.1.2p2: 1200 // Members (including explicit specializations of templates) of a named 1201 // namespace can also be defined outside that namespace by explicit 1202 // qualification of the name being defined, provided that the entity being 1203 // defined was already declared in the namespace and the definition appears 1204 // after the point of declaration in a namespace that encloses the 1205 // declarations namespace. 1206 // 1207 // Note that we only check the context at this point. We don't yet 1208 // have enough information to make sure that PrevDecl is actually 1209 // the declaration we want to match. For example, given: 1210 // 1211 // class X { 1212 // void f(); 1213 // void f(float); 1214 // }; 1215 // 1216 // void X::f(int) { } // ill-formed 1217 // 1218 // In this case, PrevDecl will point to the overload set 1219 // containing the two f's declared in X, but neither of them 1220 // matches. 1221 1222 // First check whether we named the global scope. 1223 if (isa<TranslationUnitDecl>(DC)) { 1224 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1225 << Name << D.getCXXScopeSpec().getRange(); 1226 } else if (!CurContext->Encloses(DC)) { 1227 // The qualifying scope doesn't enclose the original declaration. 1228 // Emit diagnostic based on current scope. 1229 SourceLocation L = D.getIdentifierLoc(); 1230 SourceRange R = D.getCXXScopeSpec().getRange(); 1231 if (isa<FunctionDecl>(CurContext)) 1232 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1233 else 1234 Diag(L, diag::err_invalid_declarator_scope) 1235 << Name << cast<NamedDecl>(DC) << R; 1236 InvalidDecl = true; 1237 } 1238 } 1239 1240 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1241 // Maybe we will complain about the shadowed template parameter. 1242 InvalidDecl = InvalidDecl 1243 || DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 1244 // Just pretend that we didn't see the previous declaration. 1245 PrevDecl = 0; 1246 } 1247 1248 // In C++, the previous declaration we find might be a tag type 1249 // (class or enum). In this case, the new declaration will hide the 1250 // tag type. Note that this does does not apply if we're declaring a 1251 // typedef (C++ [dcl.typedef]p4). 1252 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 1253 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1254 PrevDecl = 0; 1255 1256 QualType R = GetTypeForDeclarator(D, S); 1257 assert(!R.isNull() && "GetTypeForDeclarator() returned null type"); 1258 1259 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1260 New = ActOnTypedefDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1261 InvalidDecl); 1262 } else if (R.getTypePtr()->isFunctionType()) { 1263 New = ActOnFunctionDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1264 IsFunctionDefinition, InvalidDecl); 1265 } else { 1266 New = ActOnVariableDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1267 InvalidDecl); 1268 } 1269 1270 if (New == 0) 1271 return 0; 1272 1273 // Set the lexical context. If the declarator has a C++ scope specifier, the 1274 // lexical context will be different from the semantic context. 1275 New->setLexicalDeclContext(CurContext); 1276 1277 // If this has an identifier, add it to the scope stack. 1278 if (Name) 1279 PushOnScopeChains(New, S); 1280 // If any semantic error occurred, mark the decl as invalid. 1281 if (D.getInvalidType() || InvalidDecl) 1282 New->setInvalidDecl(); 1283 1284 return New; 1285} 1286 1287NamedDecl* 1288Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1289 QualType R, Decl* LastDeclarator, 1290 Decl* PrevDecl, bool& InvalidDecl) { 1291 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1292 if (D.getCXXScopeSpec().isSet()) { 1293 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1294 << D.getCXXScopeSpec().getRange(); 1295 InvalidDecl = true; 1296 // Pretend we didn't see the scope specifier. 1297 DC = 0; 1298 } 1299 1300 // Check that there are no default arguments (C++ only). 1301 if (getLangOptions().CPlusPlus) 1302 CheckExtraCXXDefaultArguments(D); 1303 1304 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, LastDeclarator); 1305 if (!NewTD) return 0; 1306 1307 // Handle attributes prior to checking for duplicates in MergeVarDecl 1308 ProcessDeclAttributes(NewTD, D); 1309 // Merge the decl with the existing one if appropriate. If the decl is 1310 // in an outer scope, it isn't the same thing. 1311 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1312 NewTD = MergeTypeDefDecl(NewTD, PrevDecl); 1313 if (NewTD == 0) return 0; 1314 } 1315 1316 if (S->getFnParent() == 0) { 1317 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1318 // then it shall have block scope. 1319 if (NewTD->getUnderlyingType()->isVariablyModifiedType()) { 1320 if (NewTD->getUnderlyingType()->isVariableArrayType()) 1321 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1322 else 1323 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1324 1325 InvalidDecl = true; 1326 } 1327 } 1328 return NewTD; 1329} 1330 1331NamedDecl* 1332Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1333 QualType R, Decl* LastDeclarator, 1334 Decl* PrevDecl, bool& InvalidDecl) { 1335 DeclarationName Name = GetNameForDeclarator(D); 1336 1337 // Check that there are no default arguments (C++ only). 1338 if (getLangOptions().CPlusPlus) 1339 CheckExtraCXXDefaultArguments(D); 1340 1341 if (R.getTypePtr()->isObjCInterfaceType()) { 1342 Diag(D.getIdentifierLoc(), diag::err_statically_allocated_object) 1343 << D.getIdentifier(); 1344 InvalidDecl = true; 1345 } 1346 1347 VarDecl *NewVD; 1348 VarDecl::StorageClass SC; 1349 switch (D.getDeclSpec().getStorageClassSpec()) { 1350 default: assert(0 && "Unknown storage class!"); 1351 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1352 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1353 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1354 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1355 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1356 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1357 case DeclSpec::SCS_mutable: 1358 // mutable can only appear on non-static class members, so it's always 1359 // an error here 1360 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1361 InvalidDecl = true; 1362 SC = VarDecl::None; 1363 break; 1364 } 1365 1366 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1367 if (!II) { 1368 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1369 << Name.getAsString(); 1370 return 0; 1371 } 1372 1373 if (DC->isRecord()) { 1374 // This is a static data member for a C++ class. 1375 NewVD = CXXClassVarDecl::Create(Context, cast<CXXRecordDecl>(DC), 1376 D.getIdentifierLoc(), II, 1377 R); 1378 } else { 1379 bool ThreadSpecified = D.getDeclSpec().isThreadSpecified(); 1380 if (S->getFnParent() == 0) { 1381 // C99 6.9p2: The storage-class specifiers auto and register shall not 1382 // appear in the declaration specifiers in an external declaration. 1383 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 1384 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 1385 InvalidDecl = true; 1386 } 1387 } 1388 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1389 II, R, SC, 1390 // FIXME: Move to DeclGroup... 1391 D.getDeclSpec().getSourceRange().getBegin()); 1392 NewVD->setThreadSpecified(ThreadSpecified); 1393 } 1394 NewVD->setNextDeclarator(LastDeclarator); 1395 1396 // Handle attributes prior to checking for duplicates in MergeVarDecl 1397 ProcessDeclAttributes(NewVD, D); 1398 1399 // Handle GNU asm-label extension (encoded as an attribute). 1400 if (Expr *E = (Expr*) D.getAsmLabel()) { 1401 // The parser guarantees this is a string. 1402 StringLiteral *SE = cast<StringLiteral>(E); 1403 NewVD->addAttr(new AsmLabelAttr(std::string(SE->getStrData(), 1404 SE->getByteLength()))); 1405 } 1406 1407 // Emit an error if an address space was applied to decl with local storage. 1408 // This includes arrays of objects with address space qualifiers, but not 1409 // automatic variables that point to other address spaces. 1410 // ISO/IEC TR 18037 S5.1.2 1411 if (NewVD->hasLocalStorage() && (NewVD->getType().getAddressSpace() != 0)) { 1412 Diag(D.getIdentifierLoc(), diag::err_as_qualified_auto_decl); 1413 InvalidDecl = true; 1414 } 1415 // Merge the decl with the existing one if appropriate. If the decl is 1416 // in an outer scope, it isn't the same thing. 1417 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1418 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 1419 // The user tried to define a non-static data member 1420 // out-of-line (C++ [dcl.meaning]p1). 1421 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 1422 << D.getCXXScopeSpec().getRange(); 1423 NewVD->Destroy(Context); 1424 return 0; 1425 } 1426 1427 NewVD = MergeVarDecl(NewVD, PrevDecl); 1428 if (NewVD == 0) return 0; 1429 1430 if (D.getCXXScopeSpec().isSet()) { 1431 // No previous declaration in the qualifying scope. 1432 Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 1433 << Name << D.getCXXScopeSpec().getRange(); 1434 InvalidDecl = true; 1435 } 1436 } 1437 return NewVD; 1438} 1439 1440NamedDecl* 1441Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1442 QualType R, Decl *LastDeclarator, 1443 Decl* PrevDecl, bool IsFunctionDefinition, 1444 bool& InvalidDecl) { 1445 assert(R.getTypePtr()->isFunctionType()); 1446 1447 DeclarationName Name = GetNameForDeclarator(D); 1448 FunctionDecl::StorageClass SC = FunctionDecl::None; 1449 switch (D.getDeclSpec().getStorageClassSpec()) { 1450 default: assert(0 && "Unknown storage class!"); 1451 case DeclSpec::SCS_auto: 1452 case DeclSpec::SCS_register: 1453 case DeclSpec::SCS_mutable: 1454 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_func); 1455 InvalidDecl = true; 1456 break; 1457 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 1458 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 1459 case DeclSpec::SCS_static: SC = FunctionDecl::Static; break; 1460 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 1461 } 1462 1463 bool isInline = D.getDeclSpec().isInlineSpecified(); 1464 // bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1465 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 1466 1467 FunctionDecl *NewFD; 1468 if (D.getKind() == Declarator::DK_Constructor) { 1469 // This is a C++ constructor declaration. 1470 assert(DC->isRecord() && 1471 "Constructors can only be declared in a member context"); 1472 1473 InvalidDecl = InvalidDecl || CheckConstructorDeclarator(D, R, SC); 1474 1475 // Create the new declaration 1476 NewFD = CXXConstructorDecl::Create(Context, 1477 cast<CXXRecordDecl>(DC), 1478 D.getIdentifierLoc(), Name, R, 1479 isExplicit, isInline, 1480 /*isImplicitlyDeclared=*/false); 1481 1482 if (InvalidDecl) 1483 NewFD->setInvalidDecl(); 1484 } else if (D.getKind() == Declarator::DK_Destructor) { 1485 // This is a C++ destructor declaration. 1486 if (DC->isRecord()) { 1487 InvalidDecl = InvalidDecl || CheckDestructorDeclarator(D, R, SC); 1488 1489 NewFD = CXXDestructorDecl::Create(Context, 1490 cast<CXXRecordDecl>(DC), 1491 D.getIdentifierLoc(), Name, R, 1492 isInline, 1493 /*isImplicitlyDeclared=*/false); 1494 1495 if (InvalidDecl) 1496 NewFD->setInvalidDecl(); 1497 } else { 1498 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 1499 1500 // Create a FunctionDecl to satisfy the function definition parsing 1501 // code path. 1502 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 1503 Name, R, SC, isInline, 1504 // FIXME: Move to DeclGroup... 1505 D.getDeclSpec().getSourceRange().getBegin()); 1506 InvalidDecl = true; 1507 NewFD->setInvalidDecl(); 1508 } 1509 } else if (D.getKind() == Declarator::DK_Conversion) { 1510 if (!DC->isRecord()) { 1511 Diag(D.getIdentifierLoc(), 1512 diag::err_conv_function_not_member); 1513 return 0; 1514 } else { 1515 InvalidDecl = InvalidDecl || CheckConversionDeclarator(D, R, SC); 1516 1517 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 1518 D.getIdentifierLoc(), Name, R, 1519 isInline, isExplicit); 1520 1521 if (InvalidDecl) 1522 NewFD->setInvalidDecl(); 1523 } 1524 } else if (DC->isRecord()) { 1525 // This is a C++ method declaration. 1526 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 1527 D.getIdentifierLoc(), Name, R, 1528 (SC == FunctionDecl::Static), isInline); 1529 } else { 1530 NewFD = FunctionDecl::Create(Context, DC, 1531 D.getIdentifierLoc(), 1532 Name, R, SC, isInline, 1533 // FIXME: Move to DeclGroup... 1534 D.getDeclSpec().getSourceRange().getBegin()); 1535 } 1536 NewFD->setNextDeclarator(LastDeclarator); 1537 1538 // Set the lexical context. If the declarator has a C++ 1539 // scope specifier, the lexical context will be different 1540 // from the semantic context. 1541 NewFD->setLexicalDeclContext(CurContext); 1542 1543 // Handle GNU asm-label extension (encoded as an attribute). 1544 if (Expr *E = (Expr*) D.getAsmLabel()) { 1545 // The parser guarantees this is a string. 1546 StringLiteral *SE = cast<StringLiteral>(E); 1547 NewFD->addAttr(new AsmLabelAttr(std::string(SE->getStrData(), 1548 SE->getByteLength()))); 1549 } 1550 1551 // Copy the parameter declarations from the declarator D to 1552 // the function declaration NewFD, if they are available. 1553 if (D.getNumTypeObjects() > 0) { 1554 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1555 1556 // Create Decl objects for each parameter, adding them to the 1557 // FunctionDecl. 1558 llvm::SmallVector<ParmVarDecl*, 16> Params; 1559 1560 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 1561 // function that takes no arguments, not a function that takes a 1562 // single void argument. 1563 // We let through "const void" here because Sema::GetTypeForDeclarator 1564 // already checks for that case. 1565 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1566 FTI.ArgInfo[0].Param && 1567 ((ParmVarDecl*)FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 1568 // empty arg list, don't push any params. 1569 ParmVarDecl *Param = (ParmVarDecl*)FTI.ArgInfo[0].Param; 1570 1571 // In C++, the empty parameter-type-list must be spelled "void"; a 1572 // typedef of void is not permitted. 1573 if (getLangOptions().CPlusPlus && 1574 Param->getType().getUnqualifiedType() != Context.VoidTy) { 1575 Diag(Param->getLocation(), diag::ext_param_typedef_of_void); 1576 } 1577 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 1578 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 1579 Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 1580 } 1581 1582 NewFD->setParams(Context, &Params[0], Params.size()); 1583 } else if (R->getAsTypedefType()) { 1584 // When we're declaring a function with a typedef, as in the 1585 // following example, we'll need to synthesize (unnamed) 1586 // parameters for use in the declaration. 1587 // 1588 // @code 1589 // typedef void fn(int); 1590 // fn f; 1591 // @endcode 1592 const FunctionTypeProto *FT = R->getAsFunctionTypeProto(); 1593 if (!FT) { 1594 // This is a typedef of a function with no prototype, so we 1595 // don't need to do anything. 1596 } else if ((FT->getNumArgs() == 0) || 1597 (FT->getNumArgs() == 1 && !FT->isVariadic() && 1598 FT->getArgType(0)->isVoidType())) { 1599 // This is a zero-argument function. We don't need to do anything. 1600 } else { 1601 // Synthesize a parameter for each argument type. 1602 llvm::SmallVector<ParmVarDecl*, 16> Params; 1603 for (FunctionTypeProto::arg_type_iterator ArgType = FT->arg_type_begin(); 1604 ArgType != FT->arg_type_end(); ++ArgType) { 1605 Params.push_back(ParmVarDecl::Create(Context, DC, 1606 SourceLocation(), 0, 1607 *ArgType, VarDecl::None, 1608 0)); 1609 } 1610 1611 NewFD->setParams(Context, &Params[0], Params.size()); 1612 } 1613 } 1614 1615 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) 1616 InvalidDecl = InvalidDecl || CheckConstructor(Constructor); 1617 else if (isa<CXXDestructorDecl>(NewFD)) { 1618 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 1619 Record->setUserDeclaredDestructor(true); 1620 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 1621 // user-defined destructor. 1622 Record->setPOD(false); 1623 } else if (CXXConversionDecl *Conversion = 1624 dyn_cast<CXXConversionDecl>(NewFD)) 1625 ActOnConversionDeclarator(Conversion); 1626 1627 // Extra checking for C++ overloaded operators (C++ [over.oper]). 1628 if (NewFD->isOverloadedOperator() && 1629 CheckOverloadedOperatorDeclaration(NewFD)) 1630 NewFD->setInvalidDecl(); 1631 1632 // Merge the decl with the existing one if appropriate. Since C functions 1633 // are in a flat namespace, make sure we consider decls in outer scopes. 1634 bool Redeclaration = false; 1635 if (PrevDecl && 1636 (!getLangOptions().CPlusPlus||isDeclInScope(PrevDecl, DC, S))) { 1637 // If C++, determine whether NewFD is an overload of PrevDecl or 1638 // a declaration that requires merging. If it's an overload, 1639 // there's no more work to do here; we'll just add the new 1640 // function to the scope. 1641 OverloadedFunctionDecl::function_iterator MatchedDecl; 1642 if (!getLangOptions().CPlusPlus || 1643 !IsOverload(NewFD, PrevDecl, MatchedDecl)) { 1644 Decl *OldDecl = PrevDecl; 1645 1646 // If PrevDecl was an overloaded function, extract the 1647 // FunctionDecl that matched. 1648 if (isa<OverloadedFunctionDecl>(PrevDecl)) 1649 OldDecl = *MatchedDecl; 1650 1651 // NewFD and PrevDecl represent declarations that need to be 1652 // merged. 1653 NewFD = MergeFunctionDecl(NewFD, OldDecl, Redeclaration); 1654 1655 if (NewFD == 0) return 0; 1656 if (Redeclaration) { 1657 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 1658 1659 // An out-of-line member function declaration must also be a 1660 // definition (C++ [dcl.meaning]p1). 1661 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 1662 !InvalidDecl) { 1663 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 1664 << D.getCXXScopeSpec().getRange(); 1665 NewFD->setInvalidDecl(); 1666 } 1667 } 1668 } 1669 } 1670 1671 if (D.getCXXScopeSpec().isSet() && 1672 (!PrevDecl || !Redeclaration)) { 1673 // The user tried to provide an out-of-line definition for a 1674 // function that is a member of a class or namespace, but there 1675 // was no such member function declared (C++ [class.mfct]p2, 1676 // C++ [namespace.memdef]p2). For example: 1677 // 1678 // class X { 1679 // void f() const; 1680 // }; 1681 // 1682 // void X::f() { } // ill-formed 1683 // 1684 // Complain about this problem, and attempt to suggest close 1685 // matches (e.g., those that differ only in cv-qualifiers and 1686 // whether the parameter types are references). 1687 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 1688 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 1689 InvalidDecl = true; 1690 1691 LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 1692 true); 1693 assert(!Prev.isAmbiguous() && 1694 "Cannot have an ambiguity in previous-declaration lookup"); 1695 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 1696 Func != FuncEnd; ++Func) { 1697 if (isa<FunctionDecl>(*Func) && 1698 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 1699 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 1700 } 1701 1702 PrevDecl = 0; 1703 } 1704 1705 // Handle attributes. We need to have merged decls when handling attributes 1706 // (for example to check for conflicts, etc). 1707 ProcessDeclAttributes(NewFD, D); 1708 1709 if (getLangOptions().CPlusPlus) { 1710 // In C++, check default arguments now that we have merged decls. Unless 1711 // the lexical context is the class, because in this case this is done 1712 // during delayed parsing anyway. 1713 if (!CurContext->isRecord()) 1714 CheckCXXDefaultArguments(NewFD); 1715 1716 // An out-of-line member function declaration must also be a 1717 // definition (C++ [dcl.meaning]p1). 1718 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && !InvalidDecl) { 1719 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 1720 << D.getCXXScopeSpec().getRange(); 1721 InvalidDecl = true; 1722 } 1723 } 1724 return NewFD; 1725} 1726 1727void Sema::InitializerElementNotConstant(const Expr *Init) { 1728 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 1729 << Init->getSourceRange(); 1730} 1731 1732bool Sema::CheckAddressConstantExpressionLValue(const Expr* Init) { 1733 switch (Init->getStmtClass()) { 1734 default: 1735 InitializerElementNotConstant(Init); 1736 return true; 1737 case Expr::ParenExprClass: { 1738 const ParenExpr* PE = cast<ParenExpr>(Init); 1739 return CheckAddressConstantExpressionLValue(PE->getSubExpr()); 1740 } 1741 case Expr::CompoundLiteralExprClass: 1742 return cast<CompoundLiteralExpr>(Init)->isFileScope(); 1743 case Expr::DeclRefExprClass: 1744 case Expr::QualifiedDeclRefExprClass: { 1745 const Decl *D = cast<DeclRefExpr>(Init)->getDecl(); 1746 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1747 if (VD->hasGlobalStorage()) 1748 return false; 1749 InitializerElementNotConstant(Init); 1750 return true; 1751 } 1752 if (isa<FunctionDecl>(D)) 1753 return false; 1754 InitializerElementNotConstant(Init); 1755 return true; 1756 } 1757 case Expr::MemberExprClass: { 1758 const MemberExpr *M = cast<MemberExpr>(Init); 1759 if (M->isArrow()) 1760 return CheckAddressConstantExpression(M->getBase()); 1761 return CheckAddressConstantExpressionLValue(M->getBase()); 1762 } 1763 case Expr::ArraySubscriptExprClass: { 1764 // FIXME: Should we pedwarn for "x[0+0]" (where x is a pointer)? 1765 const ArraySubscriptExpr *ASE = cast<ArraySubscriptExpr>(Init); 1766 return CheckAddressConstantExpression(ASE->getBase()) || 1767 CheckArithmeticConstantExpression(ASE->getIdx()); 1768 } 1769 case Expr::StringLiteralClass: 1770 case Expr::PredefinedExprClass: 1771 return false; 1772 case Expr::UnaryOperatorClass: { 1773 const UnaryOperator *Exp = cast<UnaryOperator>(Init); 1774 1775 // C99 6.6p9 1776 if (Exp->getOpcode() == UnaryOperator::Deref) 1777 return CheckAddressConstantExpression(Exp->getSubExpr()); 1778 1779 InitializerElementNotConstant(Init); 1780 return true; 1781 } 1782 } 1783} 1784 1785bool Sema::CheckAddressConstantExpression(const Expr* Init) { 1786 switch (Init->getStmtClass()) { 1787 default: 1788 InitializerElementNotConstant(Init); 1789 return true; 1790 case Expr::ParenExprClass: 1791 return CheckAddressConstantExpression(cast<ParenExpr>(Init)->getSubExpr()); 1792 case Expr::StringLiteralClass: 1793 case Expr::ObjCStringLiteralClass: 1794 return false; 1795 case Expr::CallExprClass: 1796 case Expr::CXXOperatorCallExprClass: 1797 // __builtin___CFStringMakeConstantString is a valid constant l-value. 1798 if (cast<CallExpr>(Init)->isBuiltinCall() == 1799 Builtin::BI__builtin___CFStringMakeConstantString) 1800 return false; 1801 1802 InitializerElementNotConstant(Init); 1803 return true; 1804 1805 case Expr::UnaryOperatorClass: { 1806 const UnaryOperator *Exp = cast<UnaryOperator>(Init); 1807 1808 // C99 6.6p9 1809 if (Exp->getOpcode() == UnaryOperator::AddrOf) 1810 return CheckAddressConstantExpressionLValue(Exp->getSubExpr()); 1811 1812 if (Exp->getOpcode() == UnaryOperator::Extension) 1813 return CheckAddressConstantExpression(Exp->getSubExpr()); 1814 1815 InitializerElementNotConstant(Init); 1816 return true; 1817 } 1818 case Expr::BinaryOperatorClass: { 1819 // FIXME: Should we pedwarn for expressions like "a + 1 + 2"? 1820 const BinaryOperator *Exp = cast<BinaryOperator>(Init); 1821 1822 Expr *PExp = Exp->getLHS(); 1823 Expr *IExp = Exp->getRHS(); 1824 if (IExp->getType()->isPointerType()) 1825 std::swap(PExp, IExp); 1826 1827 // FIXME: Should we pedwarn if IExp isn't an integer constant expression? 1828 return CheckAddressConstantExpression(PExp) || 1829 CheckArithmeticConstantExpression(IExp); 1830 } 1831 case Expr::ImplicitCastExprClass: 1832 case Expr::CStyleCastExprClass: { 1833 const Expr* SubExpr = cast<CastExpr>(Init)->getSubExpr(); 1834 if (Init->getStmtClass() == Expr::ImplicitCastExprClass) { 1835 // Check for implicit promotion 1836 if (SubExpr->getType()->isFunctionType() || 1837 SubExpr->getType()->isArrayType()) 1838 return CheckAddressConstantExpressionLValue(SubExpr); 1839 } 1840 1841 // Check for pointer->pointer cast 1842 if (SubExpr->getType()->isPointerType()) 1843 return CheckAddressConstantExpression(SubExpr); 1844 1845 if (SubExpr->getType()->isIntegralType()) { 1846 // Check for the special-case of a pointer->int->pointer cast; 1847 // this isn't standard, but some code requires it. See 1848 // PR2720 for an example. 1849 if (const CastExpr* SubCast = dyn_cast<CastExpr>(SubExpr)) { 1850 if (SubCast->getSubExpr()->getType()->isPointerType()) { 1851 unsigned IntWidth = Context.getIntWidth(SubCast->getType()); 1852 unsigned PointerWidth = Context.getTypeSize(Context.VoidPtrTy); 1853 if (IntWidth >= PointerWidth) { 1854 return CheckAddressConstantExpression(SubCast->getSubExpr()); 1855 } 1856 } 1857 } 1858 } 1859 if (SubExpr->getType()->isArithmeticType()) { 1860 return CheckArithmeticConstantExpression(SubExpr); 1861 } 1862 1863 InitializerElementNotConstant(Init); 1864 return true; 1865 } 1866 case Expr::ConditionalOperatorClass: { 1867 // FIXME: Should we pedwarn here? 1868 const ConditionalOperator *Exp = cast<ConditionalOperator>(Init); 1869 if (!Exp->getCond()->getType()->isArithmeticType()) { 1870 InitializerElementNotConstant(Init); 1871 return true; 1872 } 1873 if (CheckArithmeticConstantExpression(Exp->getCond())) 1874 return true; 1875 if (Exp->getLHS() && 1876 CheckAddressConstantExpression(Exp->getLHS())) 1877 return true; 1878 return CheckAddressConstantExpression(Exp->getRHS()); 1879 } 1880 case Expr::AddrLabelExprClass: 1881 return false; 1882 } 1883} 1884 1885static const Expr* FindExpressionBaseAddress(const Expr* E); 1886 1887static const Expr* FindExpressionBaseAddressLValue(const Expr* E) { 1888 switch (E->getStmtClass()) { 1889 default: 1890 return E; 1891 case Expr::ParenExprClass: { 1892 const ParenExpr* PE = cast<ParenExpr>(E); 1893 return FindExpressionBaseAddressLValue(PE->getSubExpr()); 1894 } 1895 case Expr::MemberExprClass: { 1896 const MemberExpr *M = cast<MemberExpr>(E); 1897 if (M->isArrow()) 1898 return FindExpressionBaseAddress(M->getBase()); 1899 return FindExpressionBaseAddressLValue(M->getBase()); 1900 } 1901 case Expr::ArraySubscriptExprClass: { 1902 const ArraySubscriptExpr *ASE = cast<ArraySubscriptExpr>(E); 1903 return FindExpressionBaseAddress(ASE->getBase()); 1904 } 1905 case Expr::UnaryOperatorClass: { 1906 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1907 1908 if (Exp->getOpcode() == UnaryOperator::Deref) 1909 return FindExpressionBaseAddress(Exp->getSubExpr()); 1910 1911 return E; 1912 } 1913 } 1914} 1915 1916static const Expr* FindExpressionBaseAddress(const Expr* E) { 1917 switch (E->getStmtClass()) { 1918 default: 1919 return E; 1920 case Expr::ParenExprClass: { 1921 const ParenExpr* PE = cast<ParenExpr>(E); 1922 return FindExpressionBaseAddress(PE->getSubExpr()); 1923 } 1924 case Expr::UnaryOperatorClass: { 1925 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1926 1927 // C99 6.6p9 1928 if (Exp->getOpcode() == UnaryOperator::AddrOf) 1929 return FindExpressionBaseAddressLValue(Exp->getSubExpr()); 1930 1931 if (Exp->getOpcode() == UnaryOperator::Extension) 1932 return FindExpressionBaseAddress(Exp->getSubExpr()); 1933 1934 return E; 1935 } 1936 case Expr::BinaryOperatorClass: { 1937 const BinaryOperator *Exp = cast<BinaryOperator>(E); 1938 1939 Expr *PExp = Exp->getLHS(); 1940 Expr *IExp = Exp->getRHS(); 1941 if (IExp->getType()->isPointerType()) 1942 std::swap(PExp, IExp); 1943 1944 return FindExpressionBaseAddress(PExp); 1945 } 1946 case Expr::ImplicitCastExprClass: { 1947 const Expr* SubExpr = cast<ImplicitCastExpr>(E)->getSubExpr(); 1948 1949 // Check for implicit promotion 1950 if (SubExpr->getType()->isFunctionType() || 1951 SubExpr->getType()->isArrayType()) 1952 return FindExpressionBaseAddressLValue(SubExpr); 1953 1954 // Check for pointer->pointer cast 1955 if (SubExpr->getType()->isPointerType()) 1956 return FindExpressionBaseAddress(SubExpr); 1957 1958 // We assume that we have an arithmetic expression here; 1959 // if we don't, we'll figure it out later 1960 return 0; 1961 } 1962 case Expr::CStyleCastExprClass: { 1963 const Expr* SubExpr = cast<CastExpr>(E)->getSubExpr(); 1964 1965 // Check for pointer->pointer cast 1966 if (SubExpr->getType()->isPointerType()) 1967 return FindExpressionBaseAddress(SubExpr); 1968 1969 // We assume that we have an arithmetic expression here; 1970 // if we don't, we'll figure it out later 1971 return 0; 1972 } 1973 } 1974} 1975 1976bool Sema::CheckArithmeticConstantExpression(const Expr* Init) { 1977 switch (Init->getStmtClass()) { 1978 default: 1979 InitializerElementNotConstant(Init); 1980 return true; 1981 case Expr::ParenExprClass: { 1982 const ParenExpr* PE = cast<ParenExpr>(Init); 1983 return CheckArithmeticConstantExpression(PE->getSubExpr()); 1984 } 1985 case Expr::FloatingLiteralClass: 1986 case Expr::IntegerLiteralClass: 1987 case Expr::CharacterLiteralClass: 1988 case Expr::ImaginaryLiteralClass: 1989 case Expr::TypesCompatibleExprClass: 1990 case Expr::CXXBoolLiteralExprClass: 1991 return false; 1992 case Expr::CallExprClass: 1993 case Expr::CXXOperatorCallExprClass: { 1994 const CallExpr *CE = cast<CallExpr>(Init); 1995 1996 // Allow any constant foldable calls to builtins. 1997 if (CE->isBuiltinCall() && CE->isEvaluatable(Context)) 1998 return false; 1999 2000 InitializerElementNotConstant(Init); 2001 return true; 2002 } 2003 case Expr::DeclRefExprClass: 2004 case Expr::QualifiedDeclRefExprClass: { 2005 const Decl *D = cast<DeclRefExpr>(Init)->getDecl(); 2006 if (isa<EnumConstantDecl>(D)) 2007 return false; 2008 InitializerElementNotConstant(Init); 2009 return true; 2010 } 2011 case Expr::CompoundLiteralExprClass: 2012 // Allow "(vector type){2,4}"; normal C constraints don't allow this, 2013 // but vectors are allowed to be magic. 2014 if (Init->getType()->isVectorType()) 2015 return false; 2016 InitializerElementNotConstant(Init); 2017 return true; 2018 case Expr::UnaryOperatorClass: { 2019 const UnaryOperator *Exp = cast<UnaryOperator>(Init); 2020 2021 switch (Exp->getOpcode()) { 2022 // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. 2023 // See C99 6.6p3. 2024 default: 2025 InitializerElementNotConstant(Init); 2026 return true; 2027 case UnaryOperator::OffsetOf: 2028 if (Exp->getSubExpr()->getType()->isConstantSizeType()) 2029 return false; 2030 InitializerElementNotConstant(Init); 2031 return true; 2032 case UnaryOperator::Extension: 2033 case UnaryOperator::LNot: 2034 case UnaryOperator::Plus: 2035 case UnaryOperator::Minus: 2036 case UnaryOperator::Not: 2037 return CheckArithmeticConstantExpression(Exp->getSubExpr()); 2038 } 2039 } 2040 case Expr::SizeOfAlignOfExprClass: { 2041 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(Init); 2042 // Special check for void types, which are allowed as an extension 2043 if (Exp->getTypeOfArgument()->isVoidType()) 2044 return false; 2045 // alignof always evaluates to a constant. 2046 // FIXME: is sizeof(int[3.0]) a constant expression? 2047 if (Exp->isSizeOf() && !Exp->getTypeOfArgument()->isConstantSizeType()) { 2048 InitializerElementNotConstant(Init); 2049 return true; 2050 } 2051 return false; 2052 } 2053 case Expr::BinaryOperatorClass: { 2054 const BinaryOperator *Exp = cast<BinaryOperator>(Init); 2055 2056 if (Exp->getLHS()->getType()->isArithmeticType() && 2057 Exp->getRHS()->getType()->isArithmeticType()) { 2058 return CheckArithmeticConstantExpression(Exp->getLHS()) || 2059 CheckArithmeticConstantExpression(Exp->getRHS()); 2060 } 2061 2062 if (Exp->getLHS()->getType()->isPointerType() && 2063 Exp->getRHS()->getType()->isPointerType()) { 2064 const Expr* LHSBase = FindExpressionBaseAddress(Exp->getLHS()); 2065 const Expr* RHSBase = FindExpressionBaseAddress(Exp->getRHS()); 2066 2067 // Only allow a null (constant integer) base; we could 2068 // allow some additional cases if necessary, but this 2069 // is sufficient to cover offsetof-like constructs. 2070 if (!LHSBase && !RHSBase) { 2071 return CheckAddressConstantExpression(Exp->getLHS()) || 2072 CheckAddressConstantExpression(Exp->getRHS()); 2073 } 2074 } 2075 2076 InitializerElementNotConstant(Init); 2077 return true; 2078 } 2079 case Expr::ImplicitCastExprClass: 2080 case Expr::CStyleCastExprClass: { 2081 const CastExpr *CE = cast<CastExpr>(Init); 2082 const Expr *SubExpr = CE->getSubExpr(); 2083 2084 if (SubExpr->getType()->isArithmeticType()) 2085 return CheckArithmeticConstantExpression(SubExpr); 2086 2087 if (SubExpr->getType()->isPointerType()) { 2088 const Expr* Base = FindExpressionBaseAddress(SubExpr); 2089 if (Base) { 2090 // the cast is only valid if done to a wide enough type 2091 if (Context.getTypeSize(CE->getType()) >= 2092 Context.getTypeSize(SubExpr->getType())) 2093 return false; 2094 } else { 2095 // If the pointer has a null base, this is an offsetof-like construct 2096 return CheckAddressConstantExpression(SubExpr); 2097 } 2098 } 2099 2100 InitializerElementNotConstant(Init); 2101 return true; 2102 } 2103 case Expr::ConditionalOperatorClass: { 2104 const ConditionalOperator *Exp = cast<ConditionalOperator>(Init); 2105 2106 // If GNU extensions are disabled, we require all operands to be arithmetic 2107 // constant expressions. 2108 if (getLangOptions().NoExtensions) { 2109 return CheckArithmeticConstantExpression(Exp->getCond()) || 2110 (Exp->getLHS() && CheckArithmeticConstantExpression(Exp->getLHS())) || 2111 CheckArithmeticConstantExpression(Exp->getRHS()); 2112 } 2113 2114 // Otherwise, we have to emulate some of the behavior of fold here. 2115 // Basically GCC treats things like "4 ? 1 : somefunc()" as a constant 2116 // because it can constant fold things away. To retain compatibility with 2117 // GCC code, we see if we can fold the condition to a constant (which we 2118 // should always be able to do in theory). If so, we only require the 2119 // specified arm of the conditional to be a constant. This is a horrible 2120 // hack, but is require by real world code that uses __builtin_constant_p. 2121 Expr::EvalResult EvalResult; 2122 if (!Exp->getCond()->Evaluate(EvalResult, Context) || 2123 EvalResult.HasSideEffects) { 2124 // If Evaluate couldn't fold it, CheckArithmeticConstantExpression 2125 // won't be able to either. Use it to emit the diagnostic though. 2126 bool Res = CheckArithmeticConstantExpression(Exp->getCond()); 2127 assert(Res && "Evaluate couldn't evaluate this constant?"); 2128 return Res; 2129 } 2130 2131 // Verify that the side following the condition is also a constant. 2132 const Expr *TrueSide = Exp->getLHS(), *FalseSide = Exp->getRHS(); 2133 if (EvalResult.Val.getInt() == 0) 2134 std::swap(TrueSide, FalseSide); 2135 2136 if (TrueSide && CheckArithmeticConstantExpression(TrueSide)) 2137 return true; 2138 2139 // Okay, the evaluated side evaluates to a constant, so we accept this. 2140 // Check to see if the other side is obviously not a constant. If so, 2141 // emit a warning that this is a GNU extension. 2142 if (FalseSide && !FalseSide->isEvaluatable(Context)) 2143 Diag(Init->getExprLoc(), 2144 diag::ext_typecheck_expression_not_constant_but_accepted) 2145 << FalseSide->getSourceRange(); 2146 return false; 2147 } 2148 } 2149} 2150 2151bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 2152 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) 2153 Init = DIE->getInit(); 2154 2155 Init = Init->IgnoreParens(); 2156 2157 if (Init->isEvaluatable(Context)) 2158 return false; 2159 2160 // Look through CXXDefaultArgExprs; they have no meaning in this context. 2161 if (CXXDefaultArgExpr* DAE = dyn_cast<CXXDefaultArgExpr>(Init)) 2162 return CheckForConstantInitializer(DAE->getExpr(), DclT); 2163 2164 if (CompoundLiteralExpr *e = dyn_cast<CompoundLiteralExpr>(Init)) 2165 return CheckForConstantInitializer(e->getInitializer(), DclT); 2166 2167 if (isa<ImplicitValueInitExpr>(Init)) { 2168 // FIXME: In C++, check for non-POD types. 2169 return false; 2170 } 2171 2172 if (InitListExpr *Exp = dyn_cast<InitListExpr>(Init)) { 2173 unsigned numInits = Exp->getNumInits(); 2174 for (unsigned i = 0; i < numInits; i++) { 2175 // FIXME: Need to get the type of the declaration for C++, 2176 // because it could be a reference? 2177 2178 if (CheckForConstantInitializer(Exp->getInit(i), 2179 Exp->getInit(i)->getType())) 2180 return true; 2181 } 2182 return false; 2183 } 2184 2185 // FIXME: We can probably remove some of this code below, now that 2186 // Expr::Evaluate is doing the heavy lifting for scalars. 2187 2188 if (Init->isNullPointerConstant(Context)) 2189 return false; 2190 if (Init->getType()->isArithmeticType()) { 2191 QualType InitTy = Context.getCanonicalType(Init->getType()) 2192 .getUnqualifiedType(); 2193 if (InitTy == Context.BoolTy) { 2194 // Special handling for pointers implicitly cast to bool; 2195 // (e.g. "_Bool rr = &rr;"). This is only legal at the top level. 2196 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Init)) { 2197 Expr* SubE = ICE->getSubExpr(); 2198 if (SubE->getType()->isPointerType() || 2199 SubE->getType()->isArrayType() || 2200 SubE->getType()->isFunctionType()) { 2201 return CheckAddressConstantExpression(Init); 2202 } 2203 } 2204 } else if (InitTy->isIntegralType()) { 2205 Expr* SubE = 0; 2206 if (CastExpr* CE = dyn_cast<CastExpr>(Init)) 2207 SubE = CE->getSubExpr(); 2208 // Special check for pointer cast to int; we allow as an extension 2209 // an address constant cast to an integer if the integer 2210 // is of an appropriate width (this sort of code is apparently used 2211 // in some places). 2212 // FIXME: Add pedwarn? 2213 // FIXME: Don't allow bitfields here! Need the FieldDecl for that. 2214 if (SubE && (SubE->getType()->isPointerType() || 2215 SubE->getType()->isArrayType() || 2216 SubE->getType()->isFunctionType())) { 2217 unsigned IntWidth = Context.getTypeSize(Init->getType()); 2218 unsigned PointerWidth = Context.getTypeSize(Context.VoidPtrTy); 2219 if (IntWidth >= PointerWidth) 2220 return CheckAddressConstantExpression(Init); 2221 } 2222 } 2223 2224 return CheckArithmeticConstantExpression(Init); 2225 } 2226 2227 if (Init->getType()->isPointerType()) 2228 return CheckAddressConstantExpression(Init); 2229 2230 // An array type at the top level that isn't an init-list must 2231 // be a string literal 2232 if (Init->getType()->isArrayType()) 2233 return false; 2234 2235 if (Init->getType()->isFunctionType()) 2236 return false; 2237 2238 // Allow block exprs at top level. 2239 if (Init->getType()->isBlockPointerType()) 2240 return false; 2241 2242 // GCC cast to union extension 2243 // note: the validity of the cast expr is checked by CheckCastTypes() 2244 if (CastExpr *C = dyn_cast<CastExpr>(Init)) { 2245 QualType T = C->getType(); 2246 return T->isUnionType() && CheckForConstantInitializer(C->getSubExpr(), T); 2247 } 2248 2249 InitializerElementNotConstant(Init); 2250 return true; 2251} 2252 2253void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init) { 2254 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 2255} 2256 2257/// AddInitializerToDecl - Adds the initializer Init to the 2258/// declaration dcl. If DirectInit is true, this is C++ direct 2259/// initialization rather than copy initialization. 2260void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init, bool DirectInit) { 2261 Decl *RealDecl = static_cast<Decl *>(dcl); 2262 Expr *Init = static_cast<Expr *>(init.release()); 2263 assert(Init && "missing initializer"); 2264 2265 // If there is no declaration, there was an error parsing it. Just ignore 2266 // the initializer. 2267 if (RealDecl == 0) { 2268 Init->Destroy(Context); 2269 return; 2270 } 2271 2272 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2273 if (!VDecl) { 2274 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2275 RealDecl->setInvalidDecl(); 2276 return; 2277 } 2278 // Get the decls type and save a reference for later, since 2279 // CheckInitializerTypes may change it. 2280 QualType DclT = VDecl->getType(), SavT = DclT; 2281 if (VDecl->isBlockVarDecl()) { 2282 VarDecl::StorageClass SC = VDecl->getStorageClass(); 2283 if (SC == VarDecl::Extern) { // C99 6.7.8p5 2284 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2285 VDecl->setInvalidDecl(); 2286 } else if (!VDecl->isInvalidDecl()) { 2287 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2288 VDecl->getDeclName(), DirectInit)) 2289 VDecl->setInvalidDecl(); 2290 2291 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2292 if (!getLangOptions().CPlusPlus) { 2293 if (SC == VarDecl::Static) // C99 6.7.8p4. 2294 CheckForConstantInitializer(Init, DclT); 2295 } 2296 } 2297 } else if (VDecl->isFileVarDecl()) { 2298 if (VDecl->getStorageClass() == VarDecl::Extern) 2299 Diag(VDecl->getLocation(), diag::warn_extern_init); 2300 if (!VDecl->isInvalidDecl()) 2301 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2302 VDecl->getDeclName(), DirectInit)) 2303 VDecl->setInvalidDecl(); 2304 2305 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2306 if (!getLangOptions().CPlusPlus) { 2307 // C99 6.7.8p4. All file scoped initializers need to be constant. 2308 CheckForConstantInitializer(Init, DclT); 2309 } 2310 } 2311 // If the type changed, it means we had an incomplete type that was 2312 // completed by the initializer. For example: 2313 // int ary[] = { 1, 3, 5 }; 2314 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2315 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2316 VDecl->setType(DclT); 2317 Init->setType(DclT); 2318 } 2319 2320 // Attach the initializer to the decl. 2321 VDecl->setInit(Init); 2322 return; 2323} 2324 2325void Sema::ActOnUninitializedDecl(DeclTy *dcl) { 2326 Decl *RealDecl = static_cast<Decl *>(dcl); 2327 2328 // If there is no declaration, there was an error parsing it. Just ignore it. 2329 if (RealDecl == 0) 2330 return; 2331 2332 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2333 QualType Type = Var->getType(); 2334 // C++ [dcl.init.ref]p3: 2335 // The initializer can be omitted for a reference only in a 2336 // parameter declaration (8.3.5), in the declaration of a 2337 // function return type, in the declaration of a class member 2338 // within its class declaration (9.2), and where the extern 2339 // specifier is explicitly used. 2340 if (Type->isReferenceType() && 2341 Var->getStorageClass() != VarDecl::Extern && 2342 Var->getStorageClass() != VarDecl::PrivateExtern) { 2343 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2344 << Var->getDeclName() 2345 << SourceRange(Var->getLocation(), Var->getLocation()); 2346 Var->setInvalidDecl(); 2347 return; 2348 } 2349 2350 // C++ [dcl.init]p9: 2351 // 2352 // If no initializer is specified for an object, and the object 2353 // is of (possibly cv-qualified) non-POD class type (or array 2354 // thereof), the object shall be default-initialized; if the 2355 // object is of const-qualified type, the underlying class type 2356 // shall have a user-declared default constructor. 2357 if (getLangOptions().CPlusPlus) { 2358 QualType InitType = Type; 2359 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2360 InitType = Array->getElementType(); 2361 if (Var->getStorageClass() != VarDecl::Extern && 2362 Var->getStorageClass() != VarDecl::PrivateExtern && 2363 InitType->isRecordType()) { 2364 const CXXConstructorDecl *Constructor 2365 = PerformInitializationByConstructor(InitType, 0, 0, 2366 Var->getLocation(), 2367 SourceRange(Var->getLocation(), 2368 Var->getLocation()), 2369 Var->getDeclName(), 2370 IK_Default); 2371 if (!Constructor) 2372 Var->setInvalidDecl(); 2373 } 2374 } 2375 2376#if 0 2377 // FIXME: Temporarily disabled because we are not properly parsing 2378 // linkage specifications on declarations, e.g., 2379 // 2380 // extern "C" const CGPoint CGPointerZero; 2381 // 2382 // C++ [dcl.init]p9: 2383 // 2384 // If no initializer is specified for an object, and the 2385 // object is of (possibly cv-qualified) non-POD class type (or 2386 // array thereof), the object shall be default-initialized; if 2387 // the object is of const-qualified type, the underlying class 2388 // type shall have a user-declared default 2389 // constructor. Otherwise, if no initializer is specified for 2390 // an object, the object and its subobjects, if any, have an 2391 // indeterminate initial value; if the object or any of its 2392 // subobjects are of const-qualified type, the program is 2393 // ill-formed. 2394 // 2395 // This isn't technically an error in C, so we don't diagnose it. 2396 // 2397 // FIXME: Actually perform the POD/user-defined default 2398 // constructor check. 2399 if (getLangOptions().CPlusPlus && 2400 Context.getCanonicalType(Type).isConstQualified() && 2401 Var->getStorageClass() != VarDecl::Extern) 2402 Diag(Var->getLocation(), diag::err_const_var_requires_init) 2403 << Var->getName() 2404 << SourceRange(Var->getLocation(), Var->getLocation()); 2405#endif 2406 } 2407} 2408 2409/// The declarators are chained together backwards, reverse the list. 2410Sema::DeclTy *Sema::FinalizeDeclaratorGroup(Scope *S, DeclTy *group) { 2411 // Often we have single declarators, handle them quickly. 2412 Decl *GroupDecl = static_cast<Decl*>(group); 2413 if (GroupDecl == 0) 2414 return 0; 2415 2416 Decl *Group = dyn_cast<Decl>(GroupDecl); 2417 Decl *NewGroup = 0; 2418 if (Group->getNextDeclarator() == 0) 2419 NewGroup = Group; 2420 else { // reverse the list. 2421 while (Group) { 2422 Decl *Next = Group->getNextDeclarator(); 2423 Group->setNextDeclarator(NewGroup); 2424 NewGroup = Group; 2425 Group = Next; 2426 } 2427 } 2428 // Perform semantic analysis that depends on having fully processed both 2429 // the declarator and initializer. 2430 for (Decl *ID = NewGroup; ID; ID = ID->getNextDeclarator()) { 2431 VarDecl *IDecl = dyn_cast<VarDecl>(ID); 2432 if (!IDecl) 2433 continue; 2434 QualType T = IDecl->getType(); 2435 2436 if (T->isVariableArrayType()) { 2437 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2438 2439 // FIXME: This won't give the correct result for 2440 // int a[10][n]; 2441 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2442 if (IDecl->isFileVarDecl()) { 2443 Diag(IDecl->getLocation(), diag::err_vla_decl_in_file_scope) << 2444 SizeRange; 2445 2446 IDecl->setInvalidDecl(); 2447 } else { 2448 // C99 6.7.5.2p2: If an identifier is declared to be an object with 2449 // static storage duration, it shall not have a variable length array. 2450 if (IDecl->getStorageClass() == VarDecl::Static) { 2451 Diag(IDecl->getLocation(), diag::err_vla_decl_has_static_storage) 2452 << SizeRange; 2453 IDecl->setInvalidDecl(); 2454 } else if (IDecl->getStorageClass() == VarDecl::Extern) { 2455 Diag(IDecl->getLocation(), diag::err_vla_decl_has_extern_linkage) 2456 << SizeRange; 2457 IDecl->setInvalidDecl(); 2458 } 2459 } 2460 } else if (T->isVariablyModifiedType()) { 2461 if (IDecl->isFileVarDecl()) { 2462 Diag(IDecl->getLocation(), diag::err_vm_decl_in_file_scope); 2463 IDecl->setInvalidDecl(); 2464 } else { 2465 if (IDecl->getStorageClass() == VarDecl::Extern) { 2466 Diag(IDecl->getLocation(), diag::err_vm_decl_has_extern_linkage); 2467 IDecl->setInvalidDecl(); 2468 } 2469 } 2470 } 2471 2472 // Block scope. C99 6.7p7: If an identifier for an object is declared with 2473 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 2474 if (IDecl->isBlockVarDecl() && 2475 IDecl->getStorageClass() != VarDecl::Extern) { 2476 if (!IDecl->isInvalidDecl() && 2477 DiagnoseIncompleteType(IDecl->getLocation(), T, 2478 diag::err_typecheck_decl_incomplete_type)) 2479 IDecl->setInvalidDecl(); 2480 } 2481 // File scope. C99 6.9.2p2: A declaration of an identifier for and 2482 // object that has file scope without an initializer, and without a 2483 // storage-class specifier or with the storage-class specifier "static", 2484 // constitutes a tentative definition. Note: A tentative definition with 2485 // external linkage is valid (C99 6.2.2p5). 2486 if (isTentativeDefinition(IDecl)) { 2487 if (T->isIncompleteArrayType()) { 2488 // C99 6.9.2 (p2, p5): Implicit initialization causes an incomplete 2489 // array to be completed. Don't issue a diagnostic. 2490 } else if (!IDecl->isInvalidDecl() && 2491 DiagnoseIncompleteType(IDecl->getLocation(), T, 2492 diag::err_typecheck_decl_incomplete_type)) 2493 // C99 6.9.2p3: If the declaration of an identifier for an object is 2494 // a tentative definition and has internal linkage (C99 6.2.2p3), the 2495 // declared type shall not be an incomplete type. 2496 IDecl->setInvalidDecl(); 2497 } 2498 if (IDecl->isFileVarDecl()) 2499 CheckForFileScopedRedefinitions(S, IDecl); 2500 } 2501 return NewGroup; 2502} 2503 2504/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 2505/// to introduce parameters into function prototype scope. 2506Sema::DeclTy * 2507Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 2508 const DeclSpec &DS = D.getDeclSpec(); 2509 2510 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 2511 VarDecl::StorageClass StorageClass = VarDecl::None; 2512 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2513 StorageClass = VarDecl::Register; 2514 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2515 Diag(DS.getStorageClassSpecLoc(), 2516 diag::err_invalid_storage_class_in_func_decl); 2517 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2518 } 2519 if (DS.isThreadSpecified()) { 2520 Diag(DS.getThreadSpecLoc(), 2521 diag::err_invalid_storage_class_in_func_decl); 2522 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2523 } 2524 2525 // Check that there are no default arguments inside the type of this 2526 // parameter (C++ only). 2527 if (getLangOptions().CPlusPlus) 2528 CheckExtraCXXDefaultArguments(D); 2529 2530 // In this context, we *do not* check D.getInvalidType(). If the declarator 2531 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 2532 // though it will not reflect the user specified type. 2533 QualType parmDeclType = GetTypeForDeclarator(D, S); 2534 2535 assert(!parmDeclType.isNull() && "GetTypeForDeclarator() returned null type"); 2536 2537 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 2538 // Can this happen for params? We already checked that they don't conflict 2539 // among each other. Here they can only shadow globals, which is ok. 2540 IdentifierInfo *II = D.getIdentifier(); 2541 if (II) { 2542 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2543 if (PrevDecl->isTemplateParameter()) { 2544 // Maybe we will complain about the shadowed template parameter. 2545 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2546 // Just pretend that we didn't see the previous declaration. 2547 PrevDecl = 0; 2548 } else if (S->isDeclScope(PrevDecl)) { 2549 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 2550 2551 // Recover by removing the name 2552 II = 0; 2553 D.SetIdentifier(0, D.getIdentifierLoc()); 2554 } 2555 } 2556 } 2557 2558 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 2559 // Doing the promotion here has a win and a loss. The win is the type for 2560 // both Decl's and DeclRefExpr's will match (a convenient invariant for the 2561 // code generator). The loss is the orginal type isn't preserved. For example: 2562 // 2563 // void func(int parmvardecl[5]) { // convert "int [5]" to "int *" 2564 // int blockvardecl[5]; 2565 // sizeof(parmvardecl); // size == 4 2566 // sizeof(blockvardecl); // size == 20 2567 // } 2568 // 2569 // For expressions, all implicit conversions are captured using the 2570 // ImplicitCastExpr AST node (we have no such mechanism for Decl's). 2571 // 2572 // FIXME: If a source translation tool needs to see the original type, then 2573 // we need to consider storing both types (in ParmVarDecl)... 2574 // 2575 if (parmDeclType->isArrayType()) { 2576 // int x[restrict 4] -> int *restrict 2577 parmDeclType = Context.getArrayDecayedType(parmDeclType); 2578 } else if (parmDeclType->isFunctionType()) 2579 parmDeclType = Context.getPointerType(parmDeclType); 2580 2581 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, 2582 D.getIdentifierLoc(), II, 2583 parmDeclType, StorageClass, 2584 0); 2585 2586 if (D.getInvalidType()) 2587 New->setInvalidDecl(); 2588 2589 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 2590 if (D.getCXXScopeSpec().isSet()) { 2591 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 2592 << D.getCXXScopeSpec().getRange(); 2593 New->setInvalidDecl(); 2594 } 2595 2596 // Add the parameter declaration into this scope. 2597 S->AddDecl(New); 2598 if (II) 2599 IdResolver.AddDecl(New); 2600 2601 ProcessDeclAttributes(New, D); 2602 return New; 2603 2604} 2605 2606void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D) { 2607 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2608 "Not a function declarator!"); 2609 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2610 2611 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 2612 // for a K&R function. 2613 if (!FTI.hasPrototype) { 2614 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2615 if (FTI.ArgInfo[i].Param == 0) { 2616 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 2617 << FTI.ArgInfo[i].Ident; 2618 // Implicitly declare the argument as type 'int' for lack of a better 2619 // type. 2620 DeclSpec DS; 2621 const char* PrevSpec; // unused 2622 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 2623 PrevSpec); 2624 Declarator ParamD(DS, Declarator::KNRTypeListContext); 2625 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 2626 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 2627 } 2628 } 2629 } 2630} 2631 2632Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 2633 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 2634 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2635 "Not a function declarator!"); 2636 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2637 2638 if (FTI.hasPrototype) { 2639 // FIXME: Diagnose arguments without names in C. 2640 } 2641 2642 Scope *ParentScope = FnBodyScope->getParent(); 2643 2644 return ActOnStartOfFunctionDef(FnBodyScope, 2645 ActOnDeclarator(ParentScope, D, 0, 2646 /*IsFunctionDefinition=*/true)); 2647} 2648 2649Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclTy *D) { 2650 Decl *decl = static_cast<Decl*>(D); 2651 FunctionDecl *FD = cast<FunctionDecl>(decl); 2652 2653 // See if this is a redefinition. 2654 const FunctionDecl *Definition; 2655 if (FD->getBody(Definition)) { 2656 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 2657 Diag(Definition->getLocation(), diag::note_previous_definition); 2658 } 2659 2660 PushDeclContext(FnBodyScope, FD); 2661 2662 // Check the validity of our function parameters 2663 CheckParmsForFunctionDef(FD); 2664 2665 // Introduce our parameters into the function scope 2666 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 2667 ParmVarDecl *Param = FD->getParamDecl(p); 2668 Param->setOwningFunction(FD); 2669 2670 // If this has an identifier, add it to the scope stack. 2671 if (Param->getIdentifier()) 2672 PushOnScopeChains(Param, FnBodyScope); 2673 } 2674 2675 // Checking attributes of current function definition 2676 // dllimport attribute. 2677 if (FD->getAttr<DLLImportAttr>() && (!FD->getAttr<DLLExportAttr>())) { 2678 // dllimport attribute cannot be applied to definition. 2679 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 2680 Diag(FD->getLocation(), 2681 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 2682 << "dllimport"; 2683 FD->setInvalidDecl(); 2684 return FD; 2685 } else { 2686 // If a symbol previously declared dllimport is later defined, the 2687 // attribute is ignored in subsequent references, and a warning is 2688 // emitted. 2689 Diag(FD->getLocation(), 2690 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 2691 << FD->getNameAsCString() << "dllimport"; 2692 } 2693 } 2694 return FD; 2695} 2696 2697Sema::DeclTy *Sema::ActOnFinishFunctionBody(DeclTy *D, StmtArg BodyArg) { 2698 Decl *dcl = static_cast<Decl *>(D); 2699 Stmt *Body = static_cast<Stmt*>(BodyArg.release()); 2700 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 2701 FD->setBody(Body); 2702 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 2703 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 2704 MD->setBody((Stmt*)Body); 2705 } else { 2706 Body->Destroy(Context); 2707 return 0; 2708 } 2709 PopDeclContext(); 2710 // Verify and clean out per-function state. 2711 2712 // Check goto/label use. 2713 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 2714 I = LabelMap.begin(), E = LabelMap.end(); I != E; ++I) { 2715 // Verify that we have no forward references left. If so, there was a goto 2716 // or address of a label taken, but no definition of it. Label fwd 2717 // definitions are indicated with a null substmt. 2718 if (I->second->getSubStmt() == 0) { 2719 LabelStmt *L = I->second; 2720 // Emit error. 2721 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 2722 2723 // At this point, we have gotos that use the bogus label. Stitch it into 2724 // the function body so that they aren't leaked and that the AST is well 2725 // formed. 2726 if (Body) { 2727#if 0 2728 // FIXME: Why do this? Having a 'push_back' in CompoundStmt is ugly, 2729 // and the AST is malformed anyway. We should just blow away 'L'. 2730 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 2731 cast<CompoundStmt>(Body)->push_back(L); 2732#else 2733 L->Destroy(Context); 2734#endif 2735 } else { 2736 // The whole function wasn't parsed correctly, just delete this. 2737 L->Destroy(Context); 2738 } 2739 } 2740 } 2741 LabelMap.clear(); 2742 2743 return D; 2744} 2745 2746/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 2747/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 2748NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 2749 IdentifierInfo &II, Scope *S) { 2750 // Extension in C99. Legal in C90, but warn about it. 2751 if (getLangOptions().C99) 2752 Diag(Loc, diag::ext_implicit_function_decl) << &II; 2753 else 2754 Diag(Loc, diag::warn_implicit_function_decl) << &II; 2755 2756 // FIXME: handle stuff like: 2757 // void foo() { extern float X(); } 2758 // void bar() { X(); } <-- implicit decl for X in another scope. 2759 2760 // Set a Declarator for the implicit definition: int foo(); 2761 const char *Dummy; 2762 DeclSpec DS; 2763 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 2764 Error = Error; // Silence warning. 2765 assert(!Error && "Error setting up implicit decl!"); 2766 Declarator D(DS, Declarator::BlockContext); 2767 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, 0, 0, 0, Loc, D)); 2768 D.SetIdentifier(&II, Loc); 2769 2770 // Insert this function into translation-unit scope. 2771 2772 DeclContext *PrevDC = CurContext; 2773 CurContext = Context.getTranslationUnitDecl(); 2774 2775 FunctionDecl *FD = 2776 dyn_cast<FunctionDecl>(static_cast<Decl*>(ActOnDeclarator(TUScope, D, 0))); 2777 FD->setImplicit(); 2778 2779 CurContext = PrevDC; 2780 2781 return FD; 2782} 2783 2784 2785TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 2786 Decl *LastDeclarator) { 2787 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 2788 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 2789 2790 // Scope manipulation handled by caller. 2791 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 2792 D.getIdentifierLoc(), 2793 D.getIdentifier(), 2794 T); 2795 NewTD->setNextDeclarator(LastDeclarator); 2796 if (D.getInvalidType()) 2797 NewTD->setInvalidDecl(); 2798 return NewTD; 2799} 2800 2801/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 2802/// former case, Name will be non-null. In the later case, Name will be null. 2803/// TagSpec indicates what kind of tag this is. TK indicates whether this is a 2804/// reference/declaration/definition of a tag. 2805Sema::DeclTy *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, 2806 SourceLocation KWLoc, const CXXScopeSpec &SS, 2807 IdentifierInfo *Name, SourceLocation NameLoc, 2808 AttributeList *Attr) { 2809 // If this is not a definition, it must have a name. 2810 assert((Name != 0 || TK == TK_Definition) && 2811 "Nameless record must be a definition!"); 2812 2813 TagDecl::TagKind Kind; 2814 switch (TagSpec) { 2815 default: assert(0 && "Unknown tag type!"); 2816 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 2817 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 2818 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 2819 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 2820 } 2821 2822 DeclContext *SearchDC = CurContext; 2823 DeclContext *DC = CurContext; 2824 NamedDecl *PrevDecl = 0; 2825 2826 bool Invalid = false; 2827 2828 if (Name && SS.isNotEmpty()) { 2829 // We have a nested-name tag ('struct foo::bar'). 2830 2831 // Check for invalid 'foo::'. 2832 if (SS.isInvalid()) { 2833 Name = 0; 2834 goto CreateNewDecl; 2835 } 2836 2837 DC = static_cast<DeclContext*>(SS.getScopeRep()); 2838 SearchDC = DC; 2839 // Look-up name inside 'foo::'. 2840 PrevDecl = dyn_cast_or_null<TagDecl>( 2841 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 2842 2843 // A tag 'foo::bar' must already exist. 2844 if (PrevDecl == 0) { 2845 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 2846 Name = 0; 2847 goto CreateNewDecl; 2848 } 2849 } else if (Name) { 2850 // If this is a named struct, check to see if there was a previous forward 2851 // declaration or definition. 2852 // FIXME: We're looking into outer scopes here, even when we 2853 // shouldn't be. Doing so can result in ambiguities that we 2854 // shouldn't be diagnosing. 2855 LookupResult R = LookupName(S, Name, LookupTagName, 2856 /*RedeclarationOnly=*/(TK != TK_Reference)); 2857 if (R.isAmbiguous()) { 2858 DiagnoseAmbiguousLookup(R, Name, NameLoc); 2859 // FIXME: This is not best way to recover from case like: 2860 // 2861 // struct S s; 2862 // 2863 // causes needless err_ovl_no_viable_function_in_init latter. 2864 Name = 0; 2865 PrevDecl = 0; 2866 Invalid = true; 2867 } 2868 else 2869 PrevDecl = R; 2870 2871 if (!getLangOptions().CPlusPlus && TK != TK_Reference) { 2872 // FIXME: This makes sure that we ignore the contexts associated 2873 // with C structs, unions, and enums when looking for a matching 2874 // tag declaration or definition. See the similar lookup tweak 2875 // in Sema::LookupName; is there a better way to deal with this? 2876 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 2877 SearchDC = SearchDC->getParent(); 2878 } 2879 } 2880 2881 if (PrevDecl && PrevDecl->isTemplateParameter()) { 2882 // Maybe we will complain about the shadowed template parameter. 2883 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 2884 // Just pretend that we didn't see the previous declaration. 2885 PrevDecl = 0; 2886 } 2887 2888 if (PrevDecl) { 2889 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 2890 // If this is a use of a previous tag, or if the tag is already declared 2891 // in the same scope (so that the definition/declaration completes or 2892 // rementions the tag), reuse the decl. 2893 if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { 2894 // Make sure that this wasn't declared as an enum and now used as a 2895 // struct or something similar. 2896 if (PrevTagDecl->getTagKind() != Kind) { 2897 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 2898 Diag(PrevDecl->getLocation(), diag::note_previous_use); 2899 // Recover by making this an anonymous redefinition. 2900 Name = 0; 2901 PrevDecl = 0; 2902 Invalid = true; 2903 } else { 2904 // If this is a use, just return the declaration we found. 2905 2906 // FIXME: In the future, return a variant or some other clue 2907 // for the consumer of this Decl to know it doesn't own it. 2908 // For our current ASTs this shouldn't be a problem, but will 2909 // need to be changed with DeclGroups. 2910 if (TK == TK_Reference) 2911 return PrevDecl; 2912 2913 // Diagnose attempts to redefine a tag. 2914 if (TK == TK_Definition) { 2915 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 2916 Diag(NameLoc, diag::err_redefinition) << Name; 2917 Diag(Def->getLocation(), diag::note_previous_definition); 2918 // If this is a redefinition, recover by making this 2919 // struct be anonymous, which will make any later 2920 // references get the previous definition. 2921 Name = 0; 2922 PrevDecl = 0; 2923 Invalid = true; 2924 } else { 2925 // If the type is currently being defined, complain 2926 // about a nested redefinition. 2927 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 2928 if (Tag->isBeingDefined()) { 2929 Diag(NameLoc, diag::err_nested_redefinition) << Name; 2930 Diag(PrevTagDecl->getLocation(), 2931 diag::note_previous_definition); 2932 Name = 0; 2933 PrevDecl = 0; 2934 Invalid = true; 2935 } 2936 } 2937 2938 // Okay, this is definition of a previously declared or referenced 2939 // tag PrevDecl. We're going to create a new Decl for it. 2940 } 2941 } 2942 // If we get here we have (another) forward declaration or we 2943 // have a definition. Just create a new decl. 2944 } else { 2945 // If we get here, this is a definition of a new tag type in a nested 2946 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 2947 // new decl/type. We set PrevDecl to NULL so that the entities 2948 // have distinct types. 2949 PrevDecl = 0; 2950 } 2951 // If we get here, we're going to create a new Decl. If PrevDecl 2952 // is non-NULL, it's a definition of the tag declared by 2953 // PrevDecl. If it's NULL, we have a new definition. 2954 } else { 2955 // PrevDecl is a namespace, template, or anything else 2956 // that lives in the IDNS_Tag identifier namespace. 2957 if (isDeclInScope(PrevDecl, SearchDC, S)) { 2958 // The tag name clashes with a namespace name, issue an error and 2959 // recover by making this tag be anonymous. 2960 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 2961 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2962 Name = 0; 2963 PrevDecl = 0; 2964 Invalid = true; 2965 } else { 2966 // The existing declaration isn't relevant to us; we're in a 2967 // new scope, so clear out the previous declaration. 2968 PrevDecl = 0; 2969 } 2970 } 2971 } else if (TK == TK_Reference && SS.isEmpty() && Name && 2972 (Kind != TagDecl::TK_enum)) { 2973 // C++ [basic.scope.pdecl]p5: 2974 // -- for an elaborated-type-specifier of the form 2975 // 2976 // class-key identifier 2977 // 2978 // if the elaborated-type-specifier is used in the 2979 // decl-specifier-seq or parameter-declaration-clause of a 2980 // function defined in namespace scope, the identifier is 2981 // declared as a class-name in the namespace that contains 2982 // the declaration; otherwise, except as a friend 2983 // declaration, the identifier is declared in the smallest 2984 // non-class, non-function-prototype scope that contains the 2985 // declaration. 2986 // 2987 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 2988 // C structs and unions. 2989 2990 // Find the context where we'll be declaring the tag. 2991 // FIXME: We would like to maintain the current DeclContext as the 2992 // lexical context, 2993 while (SearchDC->isRecord()) 2994 SearchDC = SearchDC->getParent(); 2995 2996 // Find the scope where we'll be declaring the tag. 2997 while (S->isClassScope() || 2998 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 2999 ((S->getFlags() & Scope::DeclScope) == 0) || 3000 (S->getEntity() && 3001 ((DeclContext *)S->getEntity())->isTransparentContext())) 3002 S = S->getParent(); 3003 } 3004 3005CreateNewDecl: 3006 3007 // If there is an identifier, use the location of the identifier as the 3008 // location of the decl, otherwise use the location of the struct/union 3009 // keyword. 3010 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 3011 3012 // Otherwise, create a new declaration. If there is a previous 3013 // declaration of the same entity, the two will be linked via 3014 // PrevDecl. 3015 TagDecl *New; 3016 3017 if (Kind == TagDecl::TK_enum) { 3018 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3019 // enum X { A, B, C } D; D should chain to X. 3020 New = EnumDecl::Create(Context, SearchDC, Loc, Name, 3021 cast_or_null<EnumDecl>(PrevDecl)); 3022 // If this is an undefined enum, warn. 3023 if (TK != TK_Definition) Diag(Loc, diag::ext_forward_ref_enum); 3024 } else { 3025 // struct/union/class 3026 3027 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3028 // struct X { int A; } D; D should chain to X. 3029 if (getLangOptions().CPlusPlus) 3030 // FIXME: Look for a way to use RecordDecl for simple structs. 3031 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3032 cast_or_null<CXXRecordDecl>(PrevDecl)); 3033 else 3034 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3035 cast_or_null<RecordDecl>(PrevDecl)); 3036 } 3037 3038 if (Kind != TagDecl::TK_enum) { 3039 // Handle #pragma pack: if the #pragma pack stack has non-default 3040 // alignment, make up a packed attribute for this decl. These 3041 // attributes are checked when the ASTContext lays out the 3042 // structure. 3043 // 3044 // It is important for implementing the correct semantics that this 3045 // happen here (in act on tag decl). The #pragma pack stack is 3046 // maintained as a result of parser callbacks which can occur at 3047 // many points during the parsing of a struct declaration (because 3048 // the #pragma tokens are effectively skipped over during the 3049 // parsing of the struct). 3050 if (unsigned Alignment = PackContext.getAlignment()) 3051 New->addAttr(new PackedAttr(Alignment * 8)); 3052 } 3053 3054 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 3055 // C++ [dcl.typedef]p3: 3056 // [...] Similarly, in a given scope, a class or enumeration 3057 // shall not be declared with the same name as a typedef-name 3058 // that is declared in that scope and refers to a type other 3059 // than the class or enumeration itself. 3060 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 3061 TypedefDecl *PrevTypedef = 0; 3062 if (Lookup.getKind() == LookupResult::Found) 3063 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 3064 3065 if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && 3066 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 3067 Context.getCanonicalType(Context.getTypeDeclType(New))) { 3068 Diag(Loc, diag::err_tag_definition_of_typedef) 3069 << Context.getTypeDeclType(New) 3070 << PrevTypedef->getUnderlyingType(); 3071 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 3072 Invalid = true; 3073 } 3074 } 3075 3076 if (Invalid) 3077 New->setInvalidDecl(); 3078 3079 if (Attr) 3080 ProcessDeclAttributeList(New, Attr); 3081 3082 // If we're declaring or defining a tag in function prototype scope 3083 // in C, note that this type can only be used within the function. 3084 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 3085 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 3086 3087 // Set the lexical context. If the tag has a C++ scope specifier, the 3088 // lexical context will be different from the semantic context. 3089 New->setLexicalDeclContext(CurContext); 3090 3091 if (TK == TK_Definition) 3092 New->startDefinition(); 3093 3094 // If this has an identifier, add it to the scope stack. 3095 if (Name) { 3096 S = getNonFieldDeclScope(S); 3097 PushOnScopeChains(New, S); 3098 } else { 3099 CurContext->addDecl(New); 3100 } 3101 3102 return New; 3103} 3104 3105void Sema::ActOnTagStartDefinition(Scope *S, DeclTy *TagD) { 3106 AdjustDeclIfTemplate(TagD); 3107 TagDecl *Tag = cast<TagDecl>((Decl *)TagD); 3108 3109 // Enter the tag context. 3110 PushDeclContext(S, Tag); 3111 3112 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 3113 FieldCollector->StartClass(); 3114 3115 if (Record->getIdentifier()) { 3116 // C++ [class]p2: 3117 // [...] The class-name is also inserted into the scope of the 3118 // class itself; this is known as the injected-class-name. For 3119 // purposes of access checking, the injected-class-name is treated 3120 // as if it were a public member name. 3121 RecordDecl *InjectedClassName 3122 = CXXRecordDecl::Create(Context, Record->getTagKind(), 3123 CurContext, Record->getLocation(), 3124 Record->getIdentifier(), Record); 3125 InjectedClassName->setImplicit(); 3126 PushOnScopeChains(InjectedClassName, S); 3127 } 3128 } 3129} 3130 3131void Sema::ActOnTagFinishDefinition(Scope *S, DeclTy *TagD) { 3132 AdjustDeclIfTemplate(TagD); 3133 TagDecl *Tag = cast<TagDecl>((Decl *)TagD); 3134 3135 if (isa<CXXRecordDecl>(Tag)) 3136 FieldCollector->FinishClass(); 3137 3138 // Exit this scope of this tag's definition. 3139 PopDeclContext(); 3140 3141 // Notify the consumer that we've defined a tag. 3142 Consumer.HandleTagDeclDefinition(Tag); 3143} 3144 3145/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3146/// types into constant array types in certain situations which would otherwise 3147/// be errors (for GCC compatibility). 3148static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3149 ASTContext &Context) { 3150 // This method tries to turn a variable array into a constant 3151 // array even when the size isn't an ICE. This is necessary 3152 // for compatibility with code that depends on gcc's buggy 3153 // constant expression folding, like struct {char x[(int)(char*)2];} 3154 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3155 if (!VLATy) return QualType(); 3156 3157 Expr::EvalResult EvalResult; 3158 if (!VLATy->getSizeExpr() || 3159 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context)) 3160 return QualType(); 3161 3162 assert(EvalResult.Val.isInt() && "Size expressions must be integers!"); 3163 llvm::APSInt &Res = EvalResult.Val.getInt(); 3164 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) 3165 return Context.getConstantArrayType(VLATy->getElementType(), 3166 Res, ArrayType::Normal, 0); 3167 return QualType(); 3168} 3169 3170bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 3171 QualType FieldTy, const Expr *BitWidth) { 3172 // FIXME: 6.7.2.1p4 - verify the field type. 3173 3174 llvm::APSInt Value; 3175 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 3176 return true; 3177 3178 // Zero-width bitfield is ok for anonymous field. 3179 if (Value == 0 && FieldName) 3180 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 3181 3182 if (Value.isNegative()) 3183 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) << FieldName; 3184 3185 uint64_t TypeSize = Context.getTypeSize(FieldTy); 3186 // FIXME: We won't need the 0 size once we check that the field type is valid. 3187 if (TypeSize && Value.getZExtValue() > TypeSize) 3188 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 3189 << FieldName << (unsigned)TypeSize; 3190 3191 return false; 3192} 3193 3194/// ActOnField - Each field of a struct/union/class is passed into this in order 3195/// to create a FieldDecl object for it. 3196Sema::DeclTy *Sema::ActOnField(Scope *S, DeclTy *TagD, 3197 SourceLocation DeclStart, 3198 Declarator &D, ExprTy *BitfieldWidth) { 3199 IdentifierInfo *II = D.getIdentifier(); 3200 Expr *BitWidth = (Expr*)BitfieldWidth; 3201 SourceLocation Loc = DeclStart; 3202 RecordDecl *Record = (RecordDecl *)TagD; 3203 if (II) Loc = D.getIdentifierLoc(); 3204 3205 // FIXME: Unnamed fields can be handled in various different ways, for 3206 // example, unnamed unions inject all members into the struct namespace! 3207 3208 QualType T = GetTypeForDeclarator(D, S); 3209 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3210 bool InvalidDecl = false; 3211 3212 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3213 // than a variably modified type. 3214 if (T->isVariablyModifiedType()) { 3215 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context); 3216 if (!FixedTy.isNull()) { 3217 Diag(Loc, diag::warn_illegal_constant_array_size); 3218 T = FixedTy; 3219 } else { 3220 Diag(Loc, diag::err_typecheck_field_variable_size); 3221 T = Context.IntTy; 3222 InvalidDecl = true; 3223 } 3224 } 3225 3226 if (BitWidth) { 3227 if (VerifyBitField(Loc, II, T, BitWidth)) 3228 InvalidDecl = true; 3229 } else { 3230 // Not a bitfield. 3231 3232 // validate II. 3233 3234 } 3235 3236 // FIXME: Chain fielddecls together. 3237 FieldDecl *NewFD; 3238 3239 NewFD = FieldDecl::Create(Context, Record, 3240 Loc, II, T, BitWidth, 3241 D.getDeclSpec().getStorageClassSpec() == 3242 DeclSpec::SCS_mutable); 3243 3244 if (II) { 3245 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3246 if (PrevDecl && isDeclInScope(PrevDecl, CurContext, S) 3247 && !isa<TagDecl>(PrevDecl)) { 3248 Diag(Loc, diag::err_duplicate_member) << II; 3249 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3250 NewFD->setInvalidDecl(); 3251 Record->setInvalidDecl(); 3252 } 3253 } 3254 3255 if (getLangOptions().CPlusPlus) { 3256 CheckExtraCXXDefaultArguments(D); 3257 if (!T->isPODType()) 3258 cast<CXXRecordDecl>(Record)->setPOD(false); 3259 } 3260 3261 ProcessDeclAttributes(NewFD, D); 3262 3263 if (D.getInvalidType() || InvalidDecl) 3264 NewFD->setInvalidDecl(); 3265 3266 if (II) { 3267 PushOnScopeChains(NewFD, S); 3268 } else 3269 Record->addDecl(NewFD); 3270 3271 return NewFD; 3272} 3273 3274/// TranslateIvarVisibility - Translate visibility from a token ID to an 3275/// AST enum value. 3276static ObjCIvarDecl::AccessControl 3277TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 3278 switch (ivarVisibility) { 3279 default: assert(0 && "Unknown visitibility kind"); 3280 case tok::objc_private: return ObjCIvarDecl::Private; 3281 case tok::objc_public: return ObjCIvarDecl::Public; 3282 case tok::objc_protected: return ObjCIvarDecl::Protected; 3283 case tok::objc_package: return ObjCIvarDecl::Package; 3284 } 3285} 3286 3287/// ActOnIvar - Each ivar field of an objective-c class is passed into this 3288/// in order to create an IvarDecl object for it. 3289Sema::DeclTy *Sema::ActOnIvar(Scope *S, 3290 SourceLocation DeclStart, 3291 Declarator &D, ExprTy *BitfieldWidth, 3292 tok::ObjCKeywordKind Visibility) { 3293 3294 IdentifierInfo *II = D.getIdentifier(); 3295 Expr *BitWidth = (Expr*)BitfieldWidth; 3296 SourceLocation Loc = DeclStart; 3297 if (II) Loc = D.getIdentifierLoc(); 3298 3299 // FIXME: Unnamed fields can be handled in various different ways, for 3300 // example, unnamed unions inject all members into the struct namespace! 3301 3302 QualType T = GetTypeForDeclarator(D, S); 3303 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3304 bool InvalidDecl = false; 3305 3306 if (BitWidth) { 3307 // TODO: Validate. 3308 //printf("WARNING: BITFIELDS IGNORED!\n"); 3309 3310 // 6.7.2.1p3 3311 // 6.7.2.1p4 3312 3313 } else { 3314 // Not a bitfield. 3315 3316 // validate II. 3317 3318 } 3319 3320 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3321 // than a variably modified type. 3322 if (T->isVariablyModifiedType()) { 3323 Diag(Loc, diag::err_typecheck_ivar_variable_size); 3324 InvalidDecl = true; 3325 } 3326 3327 // Get the visibility (access control) for this ivar. 3328 ObjCIvarDecl::AccessControl ac = 3329 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 3330 : ObjCIvarDecl::None; 3331 3332 // Construct the decl. 3333 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, Loc, II, T, ac, 3334 (Expr *)BitfieldWidth); 3335 3336 if (II) { 3337 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3338 if (PrevDecl && isDeclInScope(PrevDecl, CurContext, S) 3339 && !isa<TagDecl>(PrevDecl)) { 3340 Diag(Loc, diag::err_duplicate_member) << II; 3341 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3342 NewID->setInvalidDecl(); 3343 } 3344 } 3345 3346 // Process attributes attached to the ivar. 3347 ProcessDeclAttributes(NewID, D); 3348 3349 if (D.getInvalidType() || InvalidDecl) 3350 NewID->setInvalidDecl(); 3351 3352 if (II) { 3353 // FIXME: When interfaces are DeclContexts, we'll need to add 3354 // these to the interface. 3355 S->AddDecl(NewID); 3356 IdResolver.AddDecl(NewID); 3357 } 3358 3359 return NewID; 3360} 3361 3362void Sema::ActOnFields(Scope* S, 3363 SourceLocation RecLoc, DeclTy *RecDecl, 3364 DeclTy **Fields, unsigned NumFields, 3365 SourceLocation LBrac, SourceLocation RBrac, 3366 AttributeList *Attr) { 3367 Decl *EnclosingDecl = static_cast<Decl*>(RecDecl); 3368 assert(EnclosingDecl && "missing record or interface decl"); 3369 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 3370 3371 // Verify that all the fields are okay. 3372 unsigned NumNamedMembers = 0; 3373 llvm::SmallVector<FieldDecl*, 32> RecFields; 3374 3375 for (unsigned i = 0; i != NumFields; ++i) { 3376 FieldDecl *FD = cast_or_null<FieldDecl>(static_cast<Decl*>(Fields[i])); 3377 assert(FD && "missing field decl"); 3378 3379 // Get the type for the field. 3380 Type *FDTy = FD->getType().getTypePtr(); 3381 3382 if (!FD->isAnonymousStructOrUnion()) { 3383 // Remember all fields written by the user. 3384 RecFields.push_back(FD); 3385 } 3386 3387 // C99 6.7.2.1p2 - A field may not be a function type. 3388 if (FDTy->isFunctionType()) { 3389 Diag(FD->getLocation(), diag::err_field_declared_as_function) 3390 << FD->getDeclName(); 3391 FD->setInvalidDecl(); 3392 EnclosingDecl->setInvalidDecl(); 3393 continue; 3394 } 3395 // C99 6.7.2.1p2 - A field may not be an incomplete type except... 3396 if (FDTy->isIncompleteType()) { 3397 if (!Record) { // Incomplete ivar type is always an error. 3398 DiagnoseIncompleteType(FD->getLocation(), FD->getType(), 3399 diag::err_field_incomplete); 3400 FD->setInvalidDecl(); 3401 EnclosingDecl->setInvalidDecl(); 3402 continue; 3403 } 3404 if (i != NumFields-1 || // ... that the last member ... 3405 !Record->isStruct() || // ... of a structure ... 3406 !FDTy->isArrayType()) { //... may have incomplete array type. 3407 DiagnoseIncompleteType(FD->getLocation(), FD->getType(), 3408 diag::err_field_incomplete); 3409 FD->setInvalidDecl(); 3410 EnclosingDecl->setInvalidDecl(); 3411 continue; 3412 } 3413 if (NumNamedMembers < 1) { //... must have more than named member ... 3414 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 3415 << FD->getDeclName(); 3416 FD->setInvalidDecl(); 3417 EnclosingDecl->setInvalidDecl(); 3418 continue; 3419 } 3420 // Okay, we have a legal flexible array member at the end of the struct. 3421 if (Record) 3422 Record->setHasFlexibleArrayMember(true); 3423 } 3424 /// C99 6.7.2.1p2 - a struct ending in a flexible array member cannot be the 3425 /// field of another structure or the element of an array. 3426 if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 3427 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 3428 // If this is a member of a union, then entire union becomes "flexible". 3429 if (Record && Record->isUnion()) { 3430 Record->setHasFlexibleArrayMember(true); 3431 } else { 3432 // If this is a struct/class and this is not the last element, reject 3433 // it. Note that GCC supports variable sized arrays in the middle of 3434 // structures. 3435 if (i != NumFields-1) { 3436 Diag(FD->getLocation(), diag::err_variable_sized_type_in_struct) 3437 << FD->getDeclName(); 3438 FD->setInvalidDecl(); 3439 EnclosingDecl->setInvalidDecl(); 3440 continue; 3441 } 3442 // We support flexible arrays at the end of structs in other structs 3443 // as an extension. 3444 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 3445 << FD->getDeclName(); 3446 if (Record) 3447 Record->setHasFlexibleArrayMember(true); 3448 } 3449 } 3450 } 3451 /// A field cannot be an Objective-c object 3452 if (FDTy->isObjCInterfaceType()) { 3453 Diag(FD->getLocation(), diag::err_statically_allocated_object) 3454 << FD->getDeclName(); 3455 FD->setInvalidDecl(); 3456 EnclosingDecl->setInvalidDecl(); 3457 continue; 3458 } 3459 // Keep track of the number of named members. 3460 if (FD->getIdentifier()) 3461 ++NumNamedMembers; 3462 } 3463 3464 // Okay, we successfully defined 'Record'. 3465 if (Record) { 3466 Record->completeDefinition(Context); 3467 } else { 3468 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 3469 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 3470 ID->addInstanceVariablesToClass(ClsFields, RecFields.size(), RBrac); 3471 // Must enforce the rule that ivars in the base classes may not be 3472 // duplicates. 3473 if (ID->getSuperClass()) { 3474 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 3475 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 3476 ObjCIvarDecl* Ivar = (*IVI); 3477 IdentifierInfo *II = Ivar->getIdentifier(); 3478 ObjCIvarDecl* prevIvar = ID->getSuperClass()->FindIvarDeclaration(II); 3479 if (prevIvar) { 3480 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 3481 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 3482 } 3483 } 3484 } 3485 } 3486 else if (ObjCImplementationDecl *IMPDecl = 3487 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 3488 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 3489 IMPDecl->ObjCAddInstanceVariablesToClassImpl(ClsFields, RecFields.size()); 3490 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 3491 } 3492 } 3493 3494 if (Attr) 3495 ProcessDeclAttributeList(Record, Attr); 3496} 3497 3498Sema::DeclTy *Sema::ActOnEnumConstant(Scope *S, DeclTy *theEnumDecl, 3499 DeclTy *lastEnumConst, 3500 SourceLocation IdLoc, IdentifierInfo *Id, 3501 SourceLocation EqualLoc, ExprTy *val) { 3502 EnumDecl *TheEnumDecl = cast<EnumDecl>(static_cast<Decl*>(theEnumDecl)); 3503 EnumConstantDecl *LastEnumConst = 3504 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(lastEnumConst)); 3505 Expr *Val = static_cast<Expr*>(val); 3506 3507 // The scope passed in may not be a decl scope. Zip up the scope tree until 3508 // we find one that is. 3509 S = getNonFieldDeclScope(S); 3510 3511 // Verify that there isn't already something declared with this name in this 3512 // scope. 3513 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 3514 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3515 // Maybe we will complain about the shadowed template parameter. 3516 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 3517 // Just pretend that we didn't see the previous declaration. 3518 PrevDecl = 0; 3519 } 3520 3521 if (PrevDecl) { 3522 // When in C++, we may get a TagDecl with the same name; in this case the 3523 // enum constant will 'hide' the tag. 3524 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 3525 "Received TagDecl when not in C++!"); 3526 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 3527 if (isa<EnumConstantDecl>(PrevDecl)) 3528 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 3529 else 3530 Diag(IdLoc, diag::err_redefinition) << Id; 3531 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3532 Val->Destroy(Context); 3533 return 0; 3534 } 3535 } 3536 3537 llvm::APSInt EnumVal(32); 3538 QualType EltTy; 3539 if (Val) { 3540 // Make sure to promote the operand type to int. 3541 UsualUnaryConversions(Val); 3542 3543 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 3544 SourceLocation ExpLoc; 3545 if (VerifyIntegerConstantExpression(Val, &EnumVal)) { 3546 Val->Destroy(Context); 3547 Val = 0; // Just forget about it. 3548 } else { 3549 EltTy = Val->getType(); 3550 } 3551 } 3552 3553 if (!Val) { 3554 if (LastEnumConst) { 3555 // Assign the last value + 1. 3556 EnumVal = LastEnumConst->getInitVal(); 3557 ++EnumVal; 3558 3559 // Check for overflow on increment. 3560 if (EnumVal < LastEnumConst->getInitVal()) 3561 Diag(IdLoc, diag::warn_enum_value_overflow); 3562 3563 EltTy = LastEnumConst->getType(); 3564 } else { 3565 // First value, set to zero. 3566 EltTy = Context.IntTy; 3567 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 3568 } 3569 } 3570 3571 EnumConstantDecl *New = 3572 EnumConstantDecl::Create(Context, TheEnumDecl, IdLoc, Id, EltTy, 3573 Val, EnumVal); 3574 3575 // Register this decl in the current scope stack. 3576 PushOnScopeChains(New, S); 3577 3578 return New; 3579} 3580 3581// FIXME: For consistency with ActOnFields(), we should have the parser 3582// pass in the source location for the left/right braces. 3583void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclTy *EnumDeclX, 3584 DeclTy **Elements, unsigned NumElements) { 3585 EnumDecl *Enum = cast<EnumDecl>(static_cast<Decl*>(EnumDeclX)); 3586 QualType EnumType = Context.getTypeDeclType(Enum); 3587 3588 // TODO: If the result value doesn't fit in an int, it must be a long or long 3589 // long value. ISO C does not support this, but GCC does as an extension, 3590 // emit a warning. 3591 unsigned IntWidth = Context.Target.getIntWidth(); 3592 3593 // Verify that all the values are okay, compute the size of the values, and 3594 // reverse the list. 3595 unsigned NumNegativeBits = 0; 3596 unsigned NumPositiveBits = 0; 3597 3598 // Keep track of whether all elements have type int. 3599 bool AllElementsInt = true; 3600 3601 for (unsigned i = 0; i != NumElements; ++i) { 3602 EnumConstantDecl *ECD = 3603 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3604 if (!ECD) continue; // Already issued a diagnostic. 3605 3606 // If the enum value doesn't fit in an int, emit an extension warning. 3607 const llvm::APSInt &InitVal = ECD->getInitVal(); 3608 assert(InitVal.getBitWidth() >= IntWidth && 3609 "Should have promoted value to int"); 3610 if (InitVal.getBitWidth() > IntWidth) { 3611 llvm::APSInt V(InitVal); 3612 V.trunc(IntWidth); 3613 V.extend(InitVal.getBitWidth()); 3614 if (V != InitVal) 3615 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 3616 << InitVal.toString(10); 3617 } 3618 3619 // Keep track of the size of positive and negative values. 3620 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 3621 NumPositiveBits = std::max(NumPositiveBits, 3622 (unsigned)InitVal.getActiveBits()); 3623 else 3624 NumNegativeBits = std::max(NumNegativeBits, 3625 (unsigned)InitVal.getMinSignedBits()); 3626 3627 // Keep track of whether every enum element has type int (very commmon). 3628 if (AllElementsInt) 3629 AllElementsInt = ECD->getType() == Context.IntTy; 3630 } 3631 3632 // Figure out the type that should be used for this enum. 3633 // FIXME: Support attribute(packed) on enums and -fshort-enums. 3634 QualType BestType; 3635 unsigned BestWidth; 3636 3637 if (NumNegativeBits) { 3638 // If there is a negative value, figure out the smallest integer type (of 3639 // int/long/longlong) that fits. 3640 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 3641 BestType = Context.IntTy; 3642 BestWidth = IntWidth; 3643 } else { 3644 BestWidth = Context.Target.getLongWidth(); 3645 3646 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 3647 BestType = Context.LongTy; 3648 else { 3649 BestWidth = Context.Target.getLongLongWidth(); 3650 3651 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 3652 Diag(Enum->getLocation(), diag::warn_enum_too_large); 3653 BestType = Context.LongLongTy; 3654 } 3655 } 3656 } else { 3657 // If there is no negative value, figure out which of uint, ulong, ulonglong 3658 // fits. 3659 if (NumPositiveBits <= IntWidth) { 3660 BestType = Context.UnsignedIntTy; 3661 BestWidth = IntWidth; 3662 } else if (NumPositiveBits <= 3663 (BestWidth = Context.Target.getLongWidth())) { 3664 BestType = Context.UnsignedLongTy; 3665 } else { 3666 BestWidth = Context.Target.getLongLongWidth(); 3667 assert(NumPositiveBits <= BestWidth && 3668 "How could an initializer get larger than ULL?"); 3669 BestType = Context.UnsignedLongLongTy; 3670 } 3671 } 3672 3673 // Loop over all of the enumerator constants, changing their types to match 3674 // the type of the enum if needed. 3675 for (unsigned i = 0; i != NumElements; ++i) { 3676 EnumConstantDecl *ECD = 3677 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3678 if (!ECD) continue; // Already issued a diagnostic. 3679 3680 // Standard C says the enumerators have int type, but we allow, as an 3681 // extension, the enumerators to be larger than int size. If each 3682 // enumerator value fits in an int, type it as an int, otherwise type it the 3683 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 3684 // that X has type 'int', not 'unsigned'. 3685 if (ECD->getType() == Context.IntTy) { 3686 // Make sure the init value is signed. 3687 llvm::APSInt IV = ECD->getInitVal(); 3688 IV.setIsSigned(true); 3689 ECD->setInitVal(IV); 3690 3691 if (getLangOptions().CPlusPlus) 3692 // C++ [dcl.enum]p4: Following the closing brace of an 3693 // enum-specifier, each enumerator has the type of its 3694 // enumeration. 3695 ECD->setType(EnumType); 3696 continue; // Already int type. 3697 } 3698 3699 // Determine whether the value fits into an int. 3700 llvm::APSInt InitVal = ECD->getInitVal(); 3701 bool FitsInInt; 3702 if (InitVal.isUnsigned() || !InitVal.isNegative()) 3703 FitsInInt = InitVal.getActiveBits() < IntWidth; 3704 else 3705 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 3706 3707 // If it fits into an integer type, force it. Otherwise force it to match 3708 // the enum decl type. 3709 QualType NewTy; 3710 unsigned NewWidth; 3711 bool NewSign; 3712 if (FitsInInt) { 3713 NewTy = Context.IntTy; 3714 NewWidth = IntWidth; 3715 NewSign = true; 3716 } else if (ECD->getType() == BestType) { 3717 // Already the right type! 3718 if (getLangOptions().CPlusPlus) 3719 // C++ [dcl.enum]p4: Following the closing brace of an 3720 // enum-specifier, each enumerator has the type of its 3721 // enumeration. 3722 ECD->setType(EnumType); 3723 continue; 3724 } else { 3725 NewTy = BestType; 3726 NewWidth = BestWidth; 3727 NewSign = BestType->isSignedIntegerType(); 3728 } 3729 3730 // Adjust the APSInt value. 3731 InitVal.extOrTrunc(NewWidth); 3732 InitVal.setIsSigned(NewSign); 3733 ECD->setInitVal(InitVal); 3734 3735 // Adjust the Expr initializer and type. 3736 if (ECD->getInitExpr()) 3737 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), 3738 /*isLvalue=*/false)); 3739 if (getLangOptions().CPlusPlus) 3740 // C++ [dcl.enum]p4: Following the closing brace of an 3741 // enum-specifier, each enumerator has the type of its 3742 // enumeration. 3743 ECD->setType(EnumType); 3744 else 3745 ECD->setType(NewTy); 3746 } 3747 3748 Enum->completeDefinition(Context, BestType); 3749} 3750 3751Sema::DeclTy *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 3752 ExprArg expr) { 3753 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr.release()); 3754 3755 return FileScopeAsmDecl::Create(Context, CurContext, Loc, AsmString); 3756} 3757 3758 3759void Sema::ActOnPragmaPack(PragmaPackKind Kind, IdentifierInfo *Name, 3760 ExprTy *alignment, SourceLocation PragmaLoc, 3761 SourceLocation LParenLoc, SourceLocation RParenLoc) { 3762 Expr *Alignment = static_cast<Expr *>(alignment); 3763 3764 // If specified then alignment must be a "small" power of two. 3765 unsigned AlignmentVal = 0; 3766 if (Alignment) { 3767 llvm::APSInt Val; 3768 if (!Alignment->isIntegerConstantExpr(Val, Context) || 3769 !Val.isPowerOf2() || 3770 Val.getZExtValue() > 16) { 3771 Diag(PragmaLoc, diag::warn_pragma_pack_invalid_alignment); 3772 Alignment->Destroy(Context); 3773 return; // Ignore 3774 } 3775 3776 AlignmentVal = (unsigned) Val.getZExtValue(); 3777 } 3778 3779 switch (Kind) { 3780 case Action::PPK_Default: // pack([n]) 3781 PackContext.setAlignment(AlignmentVal); 3782 break; 3783 3784 case Action::PPK_Show: // pack(show) 3785 // Show the current alignment, making sure to show the right value 3786 // for the default. 3787 AlignmentVal = PackContext.getAlignment(); 3788 // FIXME: This should come from the target. 3789 if (AlignmentVal == 0) 3790 AlignmentVal = 8; 3791 Diag(PragmaLoc, diag::warn_pragma_pack_show) << AlignmentVal; 3792 break; 3793 3794 case Action::PPK_Push: // pack(push [, id] [, [n]) 3795 PackContext.push(Name); 3796 // Set the new alignment if specified. 3797 if (Alignment) 3798 PackContext.setAlignment(AlignmentVal); 3799 break; 3800 3801 case Action::PPK_Pop: // pack(pop [, id] [, n]) 3802 // MSDN, C/C++ Preprocessor Reference > Pragma Directives > pack: 3803 // "#pragma pack(pop, identifier, n) is undefined" 3804 if (Alignment && Name) 3805 Diag(PragmaLoc, diag::warn_pragma_pack_pop_identifer_and_alignment); 3806 3807 // Do the pop. 3808 if (!PackContext.pop(Name)) { 3809 // If a name was specified then failure indicates the name 3810 // wasn't found. Otherwise failure indicates the stack was 3811 // empty. 3812 Diag(PragmaLoc, diag::warn_pragma_pack_pop_failed) 3813 << (Name ? "no record matching name" : "stack empty"); 3814 3815 // FIXME: Warn about popping named records as MSVC does. 3816 } else { 3817 // Pop succeeded, set the new alignment if specified. 3818 if (Alignment) 3819 PackContext.setAlignment(AlignmentVal); 3820 } 3821 break; 3822 3823 default: 3824 assert(0 && "Invalid #pragma pack kind."); 3825 } 3826} 3827 3828bool PragmaPackStack::pop(IdentifierInfo *Name) { 3829 if (Stack.empty()) 3830 return false; 3831 3832 // If name is empty just pop top. 3833 if (!Name) { 3834 Alignment = Stack.back().first; 3835 Stack.pop_back(); 3836 return true; 3837 } 3838 3839 // Otherwise, find the named record. 3840 for (unsigned i = Stack.size(); i != 0; ) { 3841 --i; 3842 if (Stack[i].second == Name) { 3843 // Found it, pop up to and including this record. 3844 Alignment = Stack[i].first; 3845 Stack.erase(Stack.begin() + i, Stack.end()); 3846 return true; 3847 } 3848 } 3849 3850 return false; 3851} 3852