SemaDecl.cpp revision f119670d2ac5fb343b6adf4fdf2544e160f2f747
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/APValue.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclObjC.h" 19#include "clang/AST/DeclTemplate.h" 20#include "clang/AST/ExprCXX.h" 21#include "clang/Parse/DeclSpec.h" 22#include "clang/Basic/TargetInfo.h" 23#include "clang/Basic/SourceManager.h" 24// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 25#include "clang/Lex/Preprocessor.h" 26#include "clang/Lex/HeaderSearch.h" 27#include "llvm/ADT/SmallSet.h" 28#include "llvm/ADT/STLExtras.h" 29#include <algorithm> 30#include <functional> 31using namespace clang; 32 33/// \brief If the identifier refers to a type name within this scope, 34/// return the declaration of that type. 35/// 36/// This routine performs ordinary name lookup of the identifier II 37/// within the given scope, with optional C++ scope specifier SS, to 38/// determine whether the name refers to a type. If so, returns an 39/// opaque pointer (actually a QualType) corresponding to that 40/// type. Otherwise, returns NULL. 41/// 42/// If name lookup results in an ambiguity, this routine will complain 43/// and then return NULL. 44Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 45 Scope *S, const CXXScopeSpec *SS) { 46 Decl *IIDecl = 0; 47 LookupResult Result = LookupParsedName(S, SS, &II, LookupOrdinaryName, 48 false, false); 49 switch (Result.getKind()) { 50 case LookupResult::NotFound: 51 case LookupResult::FoundOverloaded: 52 return 0; 53 54 case LookupResult::AmbiguousBaseSubobjectTypes: 55 case LookupResult::AmbiguousBaseSubobjects: 56 case LookupResult::AmbiguousReference: 57 DiagnoseAmbiguousLookup(Result, DeclarationName(&II), NameLoc); 58 return 0; 59 60 case LookupResult::Found: 61 IIDecl = Result.getAsDecl(); 62 break; 63 } 64 65 if (IIDecl) { 66 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) 67 return Context.getTypeDeclType(TD).getAsOpaquePtr(); 68 else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) 69 return Context.getObjCInterfaceType(IDecl).getAsOpaquePtr(); 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 81 // in 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/// \brief Determine whether we allow overloading of the function 117/// PrevDecl with another declaration. 118/// 119/// This routine determines whether overloading is possible, not 120/// whether some new function is actually an overload. It will return 121/// true in C++ (where we can always provide overloads) or, as an 122/// extension, in C when the previous function is already an 123/// overloaded function declaration or has the "overloadable" 124/// attribute. 125static bool AllowOverloadingOfFunction(Decl *PrevDecl, ASTContext &Context) { 126 if (Context.getLangOptions().CPlusPlus) 127 return true; 128 129 if (isa<OverloadedFunctionDecl>(PrevDecl)) 130 return true; 131 132 return PrevDecl->getAttr<OverloadableAttr>() != 0; 133} 134 135/// Add this decl to the scope shadowed decl chains. 136void Sema::PushOnScopeChains(NamedDecl *D, Scope *S) { 137 // Move up the scope chain until we find the nearest enclosing 138 // non-transparent context. The declaration will be introduced into this 139 // scope. 140 while (S->getEntity() && 141 ((DeclContext *)S->getEntity())->isTransparentContext()) 142 S = S->getParent(); 143 144 S->AddDecl(D); 145 146 // Add scoped declarations into their context, so that they can be 147 // found later. Declarations without a context won't be inserted 148 // into any context. 149 CurContext->addDecl(D); 150 151 // C++ [basic.scope]p4: 152 // -- exactly one declaration shall declare a class name or 153 // enumeration name that is not a typedef name and the other 154 // declarations shall all refer to the same object or 155 // enumerator, or all refer to functions and function templates; 156 // in this case the class name or enumeration name is hidden. 157 if (TagDecl *TD = dyn_cast<TagDecl>(D)) { 158 // We are pushing the name of a tag (enum or class). 159 if (CurContext->getLookupContext() 160 == TD->getDeclContext()->getLookupContext()) { 161 // We're pushing the tag into the current context, which might 162 // require some reshuffling in the identifier resolver. 163 IdentifierResolver::iterator 164 I = IdResolver.begin(TD->getDeclName()), 165 IEnd = IdResolver.end(); 166 if (I != IEnd && isDeclInScope(*I, CurContext, S)) { 167 NamedDecl *PrevDecl = *I; 168 for (; I != IEnd && isDeclInScope(*I, CurContext, S); 169 PrevDecl = *I, ++I) { 170 if (TD->declarationReplaces(*I)) { 171 // This is a redeclaration. Remove it from the chain and 172 // break out, so that we'll add in the shadowed 173 // declaration. 174 S->RemoveDecl(*I); 175 if (PrevDecl == *I) { 176 IdResolver.RemoveDecl(*I); 177 IdResolver.AddDecl(TD); 178 return; 179 } else { 180 IdResolver.RemoveDecl(*I); 181 break; 182 } 183 } 184 } 185 186 // There is already a declaration with the same name in the same 187 // scope, which is not a tag declaration. It must be found 188 // before we find the new declaration, so insert the new 189 // declaration at the end of the chain. 190 IdResolver.AddShadowedDecl(TD, PrevDecl); 191 192 return; 193 } 194 } 195 } else if (isa<FunctionDecl>(D) && 196 AllowOverloadingOfFunction(D, Context)) { 197 // We are pushing the name of a function, which might be an 198 // overloaded name. 199 FunctionDecl *FD = cast<FunctionDecl>(D); 200 IdentifierResolver::iterator Redecl 201 = std::find_if(IdResolver.begin(FD->getDeclName()), 202 IdResolver.end(), 203 std::bind1st(std::mem_fun(&NamedDecl::declarationReplaces), 204 FD)); 205 if (Redecl != IdResolver.end()) { 206 // There is already a declaration of a function on our 207 // IdResolver chain. Replace it with this declaration. 208 S->RemoveDecl(*Redecl); 209 IdResolver.RemoveDecl(*Redecl); 210 } 211 } 212 213 IdResolver.AddDecl(D); 214} 215 216void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 217 if (S->decl_empty()) return; 218 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 219 "Scope shouldn't contain decls!"); 220 221 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 222 I != E; ++I) { 223 Decl *TmpD = static_cast<Decl*>(*I); 224 assert(TmpD && "This decl didn't get pushed??"); 225 226 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 227 NamedDecl *D = cast<NamedDecl>(TmpD); 228 229 if (!D->getDeclName()) continue; 230 231 // Remove this name from our lexical scope. 232 IdResolver.RemoveDecl(D); 233 } 234} 235 236/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 237/// return 0 if one not found. 238ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 239 // The third "scope" argument is 0 since we aren't enabling lazy built-in 240 // creation from this context. 241 NamedDecl *IDecl = LookupName(TUScope, Id, LookupOrdinaryName); 242 243 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 244} 245 246/// getNonFieldDeclScope - Retrieves the innermost scope, starting 247/// from S, where a non-field would be declared. This routine copes 248/// with the difference between C and C++ scoping rules in structs and 249/// unions. For example, the following code is well-formed in C but 250/// ill-formed in C++: 251/// @code 252/// struct S6 { 253/// enum { BAR } e; 254/// }; 255/// 256/// void test_S6() { 257/// struct S6 a; 258/// a.e = BAR; 259/// } 260/// @endcode 261/// For the declaration of BAR, this routine will return a different 262/// scope. The scope S will be the scope of the unnamed enumeration 263/// within S6. In C++, this routine will return the scope associated 264/// with S6, because the enumeration's scope is a transparent 265/// context but structures can contain non-field names. In C, this 266/// routine will return the translation unit scope, since the 267/// enumeration's scope is a transparent context and structures cannot 268/// contain non-field names. 269Scope *Sema::getNonFieldDeclScope(Scope *S) { 270 while (((S->getFlags() & Scope::DeclScope) == 0) || 271 (S->getEntity() && 272 ((DeclContext *)S->getEntity())->isTransparentContext()) || 273 (S->isClassScope() && !getLangOptions().CPlusPlus)) 274 S = S->getParent(); 275 return S; 276} 277 278void Sema::InitBuiltinVaListType() { 279 if (!Context.getBuiltinVaListType().isNull()) 280 return; 281 282 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 283 NamedDecl *VaDecl = LookupName(TUScope, VaIdent, LookupOrdinaryName); 284 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 285 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 286} 287 288/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 289/// file scope. lazily create a decl for it. ForRedeclaration is true 290/// if we're creating this built-in in anticipation of redeclaring the 291/// built-in. 292NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 293 Scope *S, bool ForRedeclaration, 294 SourceLocation Loc) { 295 Builtin::ID BID = (Builtin::ID)bid; 296 297 if (Context.BuiltinInfo.hasVAListUse(BID)) 298 InitBuiltinVaListType(); 299 300 Builtin::Context::GetBuiltinTypeError Error; 301 QualType R = Context.BuiltinInfo.GetBuiltinType(BID, Context, Error); 302 switch (Error) { 303 case Builtin::Context::GE_None: 304 // Okay 305 break; 306 307 case Builtin::Context::GE_Missing_FILE: 308 if (ForRedeclaration) 309 Diag(Loc, diag::err_implicit_decl_requires_stdio) 310 << Context.BuiltinInfo.GetName(BID); 311 return 0; 312 } 313 314 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 315 Diag(Loc, diag::ext_implicit_lib_function_decl) 316 << Context.BuiltinInfo.GetName(BID) 317 << R; 318 if (!Context.BuiltinInfo.getHeaderName(BID).empty() && 319 Diags.getDiagnosticMapping(diag::ext_implicit_lib_function_decl) 320 != diag::MAP_IGNORE) 321 Diag(Loc, diag::note_please_include_header) 322 << Context.BuiltinInfo.getHeaderName(BID) 323 << Context.BuiltinInfo.GetName(BID); 324 } 325 326 FunctionDecl *New = FunctionDecl::Create(Context, 327 Context.getTranslationUnitDecl(), 328 Loc, II, R, 329 FunctionDecl::Extern, false); 330 New->setImplicit(); 331 332 // Create Decl objects for each parameter, adding them to the 333 // FunctionDecl. 334 if (FunctionTypeProto *FT = dyn_cast<FunctionTypeProto>(R)) { 335 llvm::SmallVector<ParmVarDecl*, 16> Params; 336 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 337 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 338 FT->getArgType(i), VarDecl::None, 0)); 339 New->setParams(Context, &Params[0], Params.size()); 340 } 341 342 AddKnownFunctionAttributes(New); 343 344 // TUScope is the translation-unit scope to insert this function into. 345 // FIXME: This is hideous. We need to teach PushOnScopeChains to 346 // relate Scopes to DeclContexts, and probably eliminate CurContext 347 // entirely, but we're not there yet. 348 DeclContext *SavedContext = CurContext; 349 CurContext = Context.getTranslationUnitDecl(); 350 PushOnScopeChains(New, TUScope); 351 CurContext = SavedContext; 352 return New; 353} 354 355/// GetStdNamespace - This method gets the C++ "std" namespace. This is where 356/// everything from the standard library is defined. 357NamespaceDecl *Sema::GetStdNamespace() { 358 if (!StdNamespace) { 359 IdentifierInfo *StdIdent = &PP.getIdentifierTable().get("std"); 360 DeclContext *Global = Context.getTranslationUnitDecl(); 361 Decl *Std = LookupQualifiedName(Global, StdIdent, LookupNamespaceName); 362 StdNamespace = dyn_cast_or_null<NamespaceDecl>(Std); 363 } 364 return StdNamespace; 365} 366 367/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 368/// same name and scope as a previous declaration 'Old'. Figure out 369/// how to resolve this situation, merging decls or emitting 370/// diagnostics as appropriate. Returns true if there was an error, 371/// false otherwise. 372/// 373bool Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 374 bool objc_types = false; 375 // Allow multiple definitions for ObjC built-in typedefs. 376 // FIXME: Verify the underlying types are equivalent! 377 if (getLangOptions().ObjC1) { 378 const IdentifierInfo *TypeID = New->getIdentifier(); 379 switch (TypeID->getLength()) { 380 default: break; 381 case 2: 382 if (!TypeID->isStr("id")) 383 break; 384 Context.setObjCIdType(New); 385 objc_types = true; 386 break; 387 case 5: 388 if (!TypeID->isStr("Class")) 389 break; 390 Context.setObjCClassType(New); 391 objc_types = true; 392 return false; 393 case 3: 394 if (!TypeID->isStr("SEL")) 395 break; 396 Context.setObjCSelType(New); 397 objc_types = true; 398 return false; 399 case 8: 400 if (!TypeID->isStr("Protocol")) 401 break; 402 Context.setObjCProtoType(New->getUnderlyingType()); 403 objc_types = true; 404 return false; 405 } 406 // Fall through - the typedef name was not a builtin type. 407 } 408 // Verify the old decl was also a type. 409 TypeDecl *Old = dyn_cast<TypeDecl>(OldD); 410 if (!Old) { 411 Diag(New->getLocation(), diag::err_redefinition_different_kind) 412 << New->getDeclName(); 413 if (!objc_types) 414 Diag(OldD->getLocation(), diag::note_previous_definition); 415 return true; 416 } 417 418 // Determine the "old" type we'll use for checking and diagnostics. 419 QualType OldType; 420 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 421 OldType = OldTypedef->getUnderlyingType(); 422 else 423 OldType = Context.getTypeDeclType(Old); 424 425 // If the typedef types are not identical, reject them in all languages and 426 // with any extensions enabled. 427 428 if (OldType != New->getUnderlyingType() && 429 Context.getCanonicalType(OldType) != 430 Context.getCanonicalType(New->getUnderlyingType())) { 431 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 432 << New->getUnderlyingType() << OldType; 433 if (!objc_types) 434 Diag(Old->getLocation(), diag::note_previous_definition); 435 return true; 436 } 437 if (objc_types) return false; 438 if (getLangOptions().Microsoft) return false; 439 440 // C++ [dcl.typedef]p2: 441 // In a given non-class scope, a typedef specifier can be used to 442 // redefine the name of any type declared in that scope to refer 443 // to the type to which it already refers. 444 if (getLangOptions().CPlusPlus && !isa<CXXRecordDecl>(CurContext)) 445 return false; 446 447 // In C, redeclaration of a type is a constraint violation (6.7.2.3p1). 448 // Apparently GCC, Intel, and Sun all silently ignore the redeclaration if 449 // *either* declaration is in a system header. The code below implements 450 // this adhoc compatibility rule. FIXME: The following code will not 451 // work properly when compiling ".i" files (containing preprocessed output). 452 if (PP.getDiagnostics().getSuppressSystemWarnings()) { 453 SourceManager &SrcMgr = Context.getSourceManager(); 454 if (SrcMgr.isInSystemHeader(Old->getLocation())) 455 return false; 456 if (SrcMgr.isInSystemHeader(New->getLocation())) 457 return false; 458 } 459 460 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 461 Diag(Old->getLocation(), diag::note_previous_definition); 462 return true; 463} 464 465/// DeclhasAttr - returns true if decl Declaration already has the target 466/// attribute. 467static bool DeclHasAttr(const Decl *decl, const Attr *target) { 468 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 469 if (attr->getKind() == target->getKind()) 470 return true; 471 472 return false; 473} 474 475/// MergeAttributes - append attributes from the Old decl to the New one. 476static void MergeAttributes(Decl *New, Decl *Old) { 477 Attr *attr = const_cast<Attr*>(Old->getAttrs()), *tmp; 478 479 while (attr) { 480 tmp = attr; 481 attr = attr->getNext(); 482 483 if (!DeclHasAttr(New, tmp) && tmp->isMerged()) { 484 tmp->setInherited(true); 485 New->addAttr(tmp); 486 } else { 487 tmp->setNext(0); 488 delete(tmp); 489 } 490 } 491 492 Old->invalidateAttrs(); 493} 494 495/// MergeFunctionDecl - We just parsed a function 'New' from 496/// declarator D which has the same name and scope as a previous 497/// declaration 'Old'. Figure out how to resolve this situation, 498/// merging decls or emitting diagnostics as appropriate. 499/// 500/// In C++, New and Old must be declarations that are not 501/// overloaded. Use IsOverload to determine whether New and Old are 502/// overloaded, and to select the Old declaration that New should be 503/// merged with. 504/// 505/// Returns true if there was an error, false otherwise. 506bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 507 assert(!isa<OverloadedFunctionDecl>(OldD) && 508 "Cannot merge with an overloaded function declaration"); 509 510 // Verify the old decl was also a function. 511 FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); 512 if (!Old) { 513 Diag(New->getLocation(), diag::err_redefinition_different_kind) 514 << New->getDeclName(); 515 Diag(OldD->getLocation(), diag::note_previous_definition); 516 return true; 517 } 518 519 // Determine whether the previous declaration was a definition, 520 // implicit declaration, or a declaration. 521 diag::kind PrevDiag; 522 if (Old->isThisDeclarationADefinition()) 523 PrevDiag = diag::note_previous_definition; 524 else if (Old->isImplicit()) 525 PrevDiag = diag::note_previous_implicit_declaration; 526 else 527 PrevDiag = diag::note_previous_declaration; 528 529 QualType OldQType = Context.getCanonicalType(Old->getType()); 530 QualType NewQType = Context.getCanonicalType(New->getType()); 531 532 if (getLangOptions().CPlusPlus) { 533 // (C++98 13.1p2): 534 // Certain function declarations cannot be overloaded: 535 // -- Function declarations that differ only in the return type 536 // cannot be overloaded. 537 QualType OldReturnType 538 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 539 QualType NewReturnType 540 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 541 if (OldReturnType != NewReturnType) { 542 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 543 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 544 return true; 545 } 546 547 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 548 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 549 if (OldMethod && NewMethod) { 550 // -- Member function declarations with the same name and the 551 // same parameter types cannot be overloaded if any of them 552 // is a static member function declaration. 553 if (OldMethod->isStatic() || NewMethod->isStatic()) { 554 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 555 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 556 return true; 557 } 558 559 // C++ [class.mem]p1: 560 // [...] A member shall not be declared twice in the 561 // member-specification, except that a nested class or member 562 // class template can be declared and then later defined. 563 if (OldMethod->getLexicalDeclContext() == 564 NewMethod->getLexicalDeclContext()) { 565 unsigned NewDiag; 566 if (isa<CXXConstructorDecl>(OldMethod)) 567 NewDiag = diag::err_constructor_redeclared; 568 else if (isa<CXXDestructorDecl>(NewMethod)) 569 NewDiag = diag::err_destructor_redeclared; 570 else if (isa<CXXConversionDecl>(NewMethod)) 571 NewDiag = diag::err_conv_function_redeclared; 572 else 573 NewDiag = diag::err_member_redeclared; 574 575 Diag(New->getLocation(), NewDiag); 576 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 577 } 578 } 579 580 // (C++98 8.3.5p3): 581 // All declarations for a function shall agree exactly in both the 582 // return type and the parameter-type-list. 583 if (OldQType == NewQType) { 584 // We have a redeclaration. 585 MergeAttributes(New, Old); 586 return MergeCXXFunctionDecl(New, Old); 587 } 588 589 // Fall through for conflicting redeclarations and redefinitions. 590 } 591 592 // C: Function types need to be compatible, not identical. This handles 593 // duplicate function decls like "void f(int); void f(enum X);" properly. 594 if (!getLangOptions().CPlusPlus && 595 Context.typesAreCompatible(OldQType, NewQType)) { 596 const FunctionType *NewFuncType = NewQType->getAsFunctionType(); 597 const FunctionTypeProto *OldProto = 0; 598 if (isa<FunctionTypeNoProto>(NewFuncType) && 599 (OldProto = OldQType->getAsFunctionTypeProto())) { 600 // The old declaration provided a function prototype, but the 601 // new declaration does not. Merge in the prototype. 602 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 603 OldProto->arg_type_end()); 604 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 605 &ParamTypes[0], ParamTypes.size(), 606 OldProto->isVariadic(), 607 OldProto->getTypeQuals()); 608 New->setType(NewQType); 609 New->setInheritedPrototype(); 610 } 611 612 MergeAttributes(New, Old); 613 614 return false; 615 } 616 617 // A function that has already been declared has been redeclared or defined 618 // with a different type- show appropriate diagnostic 619 if (unsigned BuiltinID = Old->getBuiltinID(Context)) { 620 // The user has declared a builtin function with an incompatible 621 // signature. 622 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 623 // The function the user is redeclaring is a library-defined 624 // function like 'malloc' or 'printf'. Warn about the 625 // redeclaration, then ignore it. 626 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 627 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 628 << Old << Old->getType(); 629 return false; 630 } 631 632 PrevDiag = diag::note_previous_builtin_declaration; 633 } 634 635 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 636 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 637 return true; 638} 639 640/// Predicate for C "tentative" external object definitions (C99 6.9.2). 641static bool isTentativeDefinition(VarDecl *VD) { 642 if (VD->isFileVarDecl()) 643 return (!VD->getInit() && 644 (VD->getStorageClass() == VarDecl::None || 645 VD->getStorageClass() == VarDecl::Static)); 646 return false; 647} 648 649/// CheckForFileScopedRedefinitions - Make sure we forgo redefinition errors 650/// when dealing with C "tentative" external object definitions (C99 6.9.2). 651void Sema::CheckForFileScopedRedefinitions(Scope *S, VarDecl *VD) { 652 bool VDIsTentative = isTentativeDefinition(VD); 653 bool VDIsIncompleteArray = VD->getType()->isIncompleteArrayType(); 654 655 // FIXME: I don't think this will actually see all of the 656 // redefinitions. Can't we check this property on-the-fly? 657 for (IdentifierResolver::iterator I = IdResolver.begin(VD->getIdentifier()), 658 E = IdResolver.end(); 659 I != E; ++I) { 660 if (*I != VD && isDeclInScope(*I, VD->getDeclContext(), S)) { 661 VarDecl *OldDecl = dyn_cast<VarDecl>(*I); 662 663 // Handle the following case: 664 // int a[10]; 665 // int a[]; - the code below makes sure we set the correct type. 666 // int a[11]; - this is an error, size isn't 10. 667 if (OldDecl && VDIsTentative && VDIsIncompleteArray && 668 OldDecl->getType()->isConstantArrayType()) 669 VD->setType(OldDecl->getType()); 670 671 // Check for "tentative" definitions. We can't accomplish this in 672 // MergeVarDecl since the initializer hasn't been attached. 673 if (!OldDecl || isTentativeDefinition(OldDecl) || VDIsTentative) 674 continue; 675 676 // Handle __private_extern__ just like extern. 677 if (OldDecl->getStorageClass() != VarDecl::Extern && 678 OldDecl->getStorageClass() != VarDecl::PrivateExtern && 679 VD->getStorageClass() != VarDecl::Extern && 680 VD->getStorageClass() != VarDecl::PrivateExtern) { 681 Diag(VD->getLocation(), diag::err_redefinition) << VD->getDeclName(); 682 Diag(OldDecl->getLocation(), diag::note_previous_definition); 683 // One redefinition error is enough. 684 break; 685 } 686 } 687 } 688} 689 690/// MergeVarDecl - We just parsed a variable 'New' which has the same name 691/// and scope as a previous declaration 'Old'. Figure out how to resolve this 692/// situation, merging decls or emitting diagnostics as appropriate. 693/// 694/// Tentative definition rules (C99 6.9.2p2) are checked by 695/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 696/// definitions here, since the initializer hasn't been attached. 697/// 698bool Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 699 // Verify the old decl was also a variable. 700 VarDecl *Old = dyn_cast<VarDecl>(OldD); 701 if (!Old) { 702 Diag(New->getLocation(), diag::err_redefinition_different_kind) 703 << New->getDeclName(); 704 Diag(OldD->getLocation(), diag::note_previous_definition); 705 return true; 706 } 707 708 MergeAttributes(New, Old); 709 710 // Merge the types 711 QualType MergedT = Context.mergeTypes(New->getType(), Old->getType()); 712 if (MergedT.isNull()) { 713 Diag(New->getLocation(), diag::err_redefinition_different_type) 714 << New->getDeclName(); 715 Diag(Old->getLocation(), diag::note_previous_definition); 716 return true; 717 } 718 New->setType(MergedT); 719 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 720 if (New->getStorageClass() == VarDecl::Static && 721 (Old->getStorageClass() == VarDecl::None || 722 Old->getStorageClass() == VarDecl::Extern)) { 723 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 724 Diag(Old->getLocation(), diag::note_previous_definition); 725 return true; 726 } 727 // C99 6.2.2p4: Check if we have a non-static decl followed by a static. 728 if (New->getStorageClass() != VarDecl::Static && 729 Old->getStorageClass() == VarDecl::Static) { 730 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 731 Diag(Old->getLocation(), diag::note_previous_definition); 732 return true; 733 } 734 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 735 if (New->getStorageClass() != VarDecl::Extern && !New->isFileVarDecl()) { 736 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 737 Diag(Old->getLocation(), diag::note_previous_definition); 738 return true; 739 } 740 return false; 741} 742 743/// CheckParmsForFunctionDef - Check that the parameters of the given 744/// function are appropriate for the definition of a function. This 745/// takes care of any checks that cannot be performed on the 746/// declaration itself, e.g., that the types of each of the function 747/// parameters are complete. 748bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 749 bool HasInvalidParm = false; 750 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 751 ParmVarDecl *Param = FD->getParamDecl(p); 752 753 // C99 6.7.5.3p4: the parameters in a parameter type list in a 754 // function declarator that is part of a function definition of 755 // that function shall not have incomplete type. 756 if (!Param->isInvalidDecl() && 757 DiagnoseIncompleteType(Param->getLocation(), Param->getType(), 758 diag::err_typecheck_decl_incomplete_type)) { 759 Param->setInvalidDecl(); 760 HasInvalidParm = true; 761 } 762 763 // C99 6.9.1p5: If the declarator includes a parameter type list, the 764 // declaration of each parameter shall include an identifier. 765 if (Param->getIdentifier() == 0 && !getLangOptions().CPlusPlus) 766 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 767 } 768 769 return HasInvalidParm; 770} 771 772/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 773/// no declarator (e.g. "struct foo;") is parsed. 774Sema::DeclTy *Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 775 TagDecl *Tag = 0; 776 if (DS.getTypeSpecType() == DeclSpec::TST_class || 777 DS.getTypeSpecType() == DeclSpec::TST_struct || 778 DS.getTypeSpecType() == DeclSpec::TST_union || 779 DS.getTypeSpecType() == DeclSpec::TST_enum) 780 Tag = dyn_cast<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 781 782 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 783 if (!Record->getDeclName() && Record->isDefinition() && 784 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 785 return BuildAnonymousStructOrUnion(S, DS, Record); 786 787 // Microsoft allows unnamed struct/union fields. Don't complain 788 // about them. 789 // FIXME: Should we support Microsoft's extensions in this area? 790 if (Record->getDeclName() && getLangOptions().Microsoft) 791 return Tag; 792 } 793 794 if (!DS.isMissingDeclaratorOk() && 795 DS.getTypeSpecType() != DeclSpec::TST_error) { 796 // Warn about typedefs of enums without names, since this is an 797 // extension in both Microsoft an GNU. 798 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 799 Tag && isa<EnumDecl>(Tag)) { 800 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 801 << DS.getSourceRange(); 802 return Tag; 803 } 804 805 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 806 << DS.getSourceRange(); 807 return 0; 808 } 809 810 return Tag; 811} 812 813/// InjectAnonymousStructOrUnionMembers - Inject the members of the 814/// anonymous struct or union AnonRecord into the owning context Owner 815/// and scope S. This routine will be invoked just after we realize 816/// that an unnamed union or struct is actually an anonymous union or 817/// struct, e.g., 818/// 819/// @code 820/// union { 821/// int i; 822/// float f; 823/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 824/// // f into the surrounding scope.x 825/// @endcode 826/// 827/// This routine is recursive, injecting the names of nested anonymous 828/// structs/unions into the owning context and scope as well. 829bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 830 RecordDecl *AnonRecord) { 831 bool Invalid = false; 832 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 833 FEnd = AnonRecord->field_end(); 834 F != FEnd; ++F) { 835 if ((*F)->getDeclName()) { 836 NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 837 LookupOrdinaryName, true); 838 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 839 // C++ [class.union]p2: 840 // The names of the members of an anonymous union shall be 841 // distinct from the names of any other entity in the 842 // scope in which the anonymous union is declared. 843 unsigned diagKind 844 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 845 : diag::err_anonymous_struct_member_redecl; 846 Diag((*F)->getLocation(), diagKind) 847 << (*F)->getDeclName(); 848 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 849 Invalid = true; 850 } else { 851 // C++ [class.union]p2: 852 // For the purpose of name lookup, after the anonymous union 853 // definition, the members of the anonymous union are 854 // considered to have been defined in the scope in which the 855 // anonymous union is declared. 856 Owner->makeDeclVisibleInContext(*F); 857 S->AddDecl(*F); 858 IdResolver.AddDecl(*F); 859 } 860 } else if (const RecordType *InnerRecordType 861 = (*F)->getType()->getAsRecordType()) { 862 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 863 if (InnerRecord->isAnonymousStructOrUnion()) 864 Invalid = Invalid || 865 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 866 } 867 } 868 869 return Invalid; 870} 871 872/// ActOnAnonymousStructOrUnion - Handle the declaration of an 873/// anonymous structure or union. Anonymous unions are a C++ feature 874/// (C++ [class.union]) and a GNU C extension; anonymous structures 875/// are a GNU C and GNU C++ extension. 876Sema::DeclTy *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 877 RecordDecl *Record) { 878 DeclContext *Owner = Record->getDeclContext(); 879 880 // Diagnose whether this anonymous struct/union is an extension. 881 if (Record->isUnion() && !getLangOptions().CPlusPlus) 882 Diag(Record->getLocation(), diag::ext_anonymous_union); 883 else if (!Record->isUnion()) 884 Diag(Record->getLocation(), diag::ext_anonymous_struct); 885 886 // C and C++ require different kinds of checks for anonymous 887 // structs/unions. 888 bool Invalid = false; 889 if (getLangOptions().CPlusPlus) { 890 const char* PrevSpec = 0; 891 // C++ [class.union]p3: 892 // Anonymous unions declared in a named namespace or in the 893 // global namespace shall be declared static. 894 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 895 (isa<TranslationUnitDecl>(Owner) || 896 (isa<NamespaceDecl>(Owner) && 897 cast<NamespaceDecl>(Owner)->getDeclName()))) { 898 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 899 Invalid = true; 900 901 // Recover by adding 'static'. 902 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); 903 } 904 // C++ [class.union]p3: 905 // A storage class is not allowed in a declaration of an 906 // anonymous union in a class scope. 907 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 908 isa<RecordDecl>(Owner)) { 909 Diag(DS.getStorageClassSpecLoc(), 910 diag::err_anonymous_union_with_storage_spec); 911 Invalid = true; 912 913 // Recover by removing the storage specifier. 914 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 915 PrevSpec); 916 } 917 918 // C++ [class.union]p2: 919 // The member-specification of an anonymous union shall only 920 // define non-static data members. [Note: nested types and 921 // functions cannot be declared within an anonymous union. ] 922 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 923 MemEnd = Record->decls_end(); 924 Mem != MemEnd; ++Mem) { 925 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 926 // C++ [class.union]p3: 927 // An anonymous union shall not have private or protected 928 // members (clause 11). 929 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 930 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 931 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 932 Invalid = true; 933 } 934 } else if ((*Mem)->isImplicit()) { 935 // Any implicit members are fine. 936 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 937 // This is a type that showed up in an 938 // elaborated-type-specifier inside the anonymous struct or 939 // union, but which actually declares a type outside of the 940 // anonymous struct or union. It's okay. 941 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 942 if (!MemRecord->isAnonymousStructOrUnion() && 943 MemRecord->getDeclName()) { 944 // This is a nested type declaration. 945 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 946 << (int)Record->isUnion(); 947 Invalid = true; 948 } 949 } else { 950 // We have something that isn't a non-static data 951 // member. Complain about it. 952 unsigned DK = diag::err_anonymous_record_bad_member; 953 if (isa<TypeDecl>(*Mem)) 954 DK = diag::err_anonymous_record_with_type; 955 else if (isa<FunctionDecl>(*Mem)) 956 DK = diag::err_anonymous_record_with_function; 957 else if (isa<VarDecl>(*Mem)) 958 DK = diag::err_anonymous_record_with_static; 959 Diag((*Mem)->getLocation(), DK) 960 << (int)Record->isUnion(); 961 Invalid = true; 962 } 963 } 964 } else { 965 // FIXME: Check GNU C semantics 966 if (Record->isUnion() && !Owner->isRecord()) { 967 Diag(Record->getLocation(), diag::err_anonymous_union_not_member) 968 << (int)getLangOptions().CPlusPlus; 969 Invalid = true; 970 } 971 } 972 973 if (!Record->isUnion() && !Owner->isRecord()) { 974 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 975 << (int)getLangOptions().CPlusPlus; 976 Invalid = true; 977 } 978 979 // Create a declaration for this anonymous struct/union. 980 NamedDecl *Anon = 0; 981 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 982 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 983 /*IdentifierInfo=*/0, 984 Context.getTypeDeclType(Record), 985 /*BitWidth=*/0, /*Mutable=*/false); 986 Anon->setAccess(AS_public); 987 if (getLangOptions().CPlusPlus) 988 FieldCollector->Add(cast<FieldDecl>(Anon)); 989 } else { 990 VarDecl::StorageClass SC; 991 switch (DS.getStorageClassSpec()) { 992 default: assert(0 && "Unknown storage class!"); 993 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 994 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 995 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 996 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 997 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 998 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 999 case DeclSpec::SCS_mutable: 1000 // mutable can only appear on non-static class members, so it's always 1001 // an error here 1002 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1003 Invalid = true; 1004 SC = VarDecl::None; 1005 break; 1006 } 1007 1008 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1009 /*IdentifierInfo=*/0, 1010 Context.getTypeDeclType(Record), 1011 SC, DS.getSourceRange().getBegin()); 1012 } 1013 Anon->setImplicit(); 1014 1015 // Add the anonymous struct/union object to the current 1016 // context. We'll be referencing this object when we refer to one of 1017 // its members. 1018 Owner->addDecl(Anon); 1019 1020 // Inject the members of the anonymous struct/union into the owning 1021 // context and into the identifier resolver chain for name lookup 1022 // purposes. 1023 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1024 Invalid = true; 1025 1026 // Mark this as an anonymous struct/union type. Note that we do not 1027 // do this until after we have already checked and injected the 1028 // members of this anonymous struct/union type, because otherwise 1029 // the members could be injected twice: once by DeclContext when it 1030 // builds its lookup table, and once by 1031 // InjectAnonymousStructOrUnionMembers. 1032 Record->setAnonymousStructOrUnion(true); 1033 1034 if (Invalid) 1035 Anon->setInvalidDecl(); 1036 1037 return Anon; 1038} 1039 1040bool Sema::CheckSingleInitializer(Expr *&Init, QualType DeclType, 1041 bool DirectInit) { 1042 // Get the type before calling CheckSingleAssignmentConstraints(), since 1043 // it can promote the expression. 1044 QualType InitType = Init->getType(); 1045 1046 if (getLangOptions().CPlusPlus) { 1047 // FIXME: I dislike this error message. A lot. 1048 if (PerformImplicitConversion(Init, DeclType, "initializing", DirectInit)) 1049 return Diag(Init->getSourceRange().getBegin(), 1050 diag::err_typecheck_convert_incompatible) 1051 << DeclType << Init->getType() << "initializing" 1052 << Init->getSourceRange(); 1053 1054 return false; 1055 } 1056 1057 AssignConvertType ConvTy = CheckSingleAssignmentConstraints(DeclType, Init); 1058 return DiagnoseAssignmentResult(ConvTy, Init->getLocStart(), DeclType, 1059 InitType, Init, "initializing"); 1060} 1061 1062bool Sema::CheckStringLiteralInit(StringLiteral *strLiteral, QualType &DeclT) { 1063 const ArrayType *AT = Context.getAsArrayType(DeclT); 1064 1065 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) { 1066 // C99 6.7.8p14. We have an array of character type with unknown size 1067 // being initialized to a string literal. 1068 llvm::APSInt ConstVal(32); 1069 ConstVal = strLiteral->getByteLength() + 1; 1070 // Return a new array type (C99 6.7.8p22). 1071 DeclT = Context.getConstantArrayType(IAT->getElementType(), ConstVal, 1072 ArrayType::Normal, 0); 1073 } else { 1074 const ConstantArrayType *CAT = cast<ConstantArrayType>(AT); 1075 // C99 6.7.8p14. We have an array of character type with known size. 1076 // FIXME: Avoid truncation for 64-bit length strings. 1077 if (strLiteral->getByteLength() > (unsigned)CAT->getSize().getZExtValue()) 1078 Diag(strLiteral->getSourceRange().getBegin(), 1079 diag::warn_initializer_string_for_char_array_too_long) 1080 << strLiteral->getSourceRange(); 1081 } 1082 // Set type from "char *" to "constant array of char". 1083 strLiteral->setType(DeclT); 1084 // For now, we always return false (meaning success). 1085 return false; 1086} 1087 1088StringLiteral *Sema::IsStringLiteralInit(Expr *Init, QualType DeclType) { 1089 const ArrayType *AT = Context.getAsArrayType(DeclType); 1090 if (AT && AT->getElementType()->isCharType()) { 1091 return dyn_cast<StringLiteral>(Init->IgnoreParens()); 1092 } 1093 return 0; 1094} 1095 1096bool Sema::CheckInitializerTypes(Expr *&Init, QualType &DeclType, 1097 SourceLocation InitLoc, 1098 DeclarationName InitEntity, 1099 bool DirectInit) { 1100 if (DeclType->isDependentType() || Init->isTypeDependent()) 1101 return false; 1102 1103 // C++ [dcl.init.ref]p1: 1104 // A variable declared to be a T&, that is "reference to type T" 1105 // (8.3.2), shall be initialized by an object, or function, of 1106 // type T or by an object that can be converted into a T. 1107 if (DeclType->isReferenceType()) 1108 return CheckReferenceInit(Init, DeclType, 0, false, DirectInit); 1109 1110 // C99 6.7.8p3: The type of the entity to be initialized shall be an array 1111 // of unknown size ("[]") or an object type that is not a variable array type. 1112 if (const VariableArrayType *VAT = Context.getAsVariableArrayType(DeclType)) 1113 return Diag(InitLoc, diag::err_variable_object_no_init) 1114 << VAT->getSizeExpr()->getSourceRange(); 1115 1116 InitListExpr *InitList = dyn_cast<InitListExpr>(Init); 1117 if (!InitList) { 1118 // FIXME: Handle wide strings 1119 if (StringLiteral *strLiteral = IsStringLiteralInit(Init, DeclType)) 1120 return CheckStringLiteralInit(strLiteral, DeclType); 1121 1122 // C++ [dcl.init]p14: 1123 // -- If the destination type is a (possibly cv-qualified) class 1124 // type: 1125 if (getLangOptions().CPlusPlus && DeclType->isRecordType()) { 1126 QualType DeclTypeC = Context.getCanonicalType(DeclType); 1127 QualType InitTypeC = Context.getCanonicalType(Init->getType()); 1128 1129 // -- If the initialization is direct-initialization, or if it is 1130 // copy-initialization where the cv-unqualified version of the 1131 // source type is the same class as, or a derived class of, the 1132 // class of the destination, constructors are considered. 1133 if ((DeclTypeC.getUnqualifiedType() == InitTypeC.getUnqualifiedType()) || 1134 IsDerivedFrom(InitTypeC, DeclTypeC)) { 1135 CXXConstructorDecl *Constructor 1136 = PerformInitializationByConstructor(DeclType, &Init, 1, 1137 InitLoc, Init->getSourceRange(), 1138 InitEntity, 1139 DirectInit? IK_Direct : IK_Copy); 1140 return Constructor == 0; 1141 } 1142 1143 // -- Otherwise (i.e., for the remaining copy-initialization 1144 // cases), user-defined conversion sequences that can 1145 // convert from the source type to the destination type or 1146 // (when a conversion function is used) to a derived class 1147 // thereof are enumerated as described in 13.3.1.4, and the 1148 // best one is chosen through overload resolution 1149 // (13.3). If the conversion cannot be done or is 1150 // ambiguous, the initialization is ill-formed. The 1151 // function selected is called with the initializer 1152 // expression as its argument; if the function is a 1153 // constructor, the call initializes a temporary of the 1154 // destination type. 1155 // FIXME: We're pretending to do copy elision here; return to 1156 // this when we have ASTs for such things. 1157 if (!PerformImplicitConversion(Init, DeclType, "initializing")) 1158 return false; 1159 1160 if (InitEntity) 1161 return Diag(InitLoc, diag::err_cannot_initialize_decl) 1162 << InitEntity << (int)(Init->isLvalue(Context) == Expr::LV_Valid) 1163 << Init->getType() << Init->getSourceRange(); 1164 else 1165 return Diag(InitLoc, diag::err_cannot_initialize_decl_noname) 1166 << DeclType << (int)(Init->isLvalue(Context) == Expr::LV_Valid) 1167 << Init->getType() << Init->getSourceRange(); 1168 } 1169 1170 // C99 6.7.8p16. 1171 if (DeclType->isArrayType()) 1172 return Diag(Init->getLocStart(), diag::err_array_init_list_required) 1173 << Init->getSourceRange(); 1174 1175 return CheckSingleInitializer(Init, DeclType, DirectInit); 1176 } 1177 1178 bool hadError = CheckInitList(InitList, DeclType); 1179 Init = InitList; 1180 return hadError; 1181} 1182 1183/// GetNameForDeclarator - Determine the full declaration name for the 1184/// given Declarator. 1185DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1186 switch (D.getKind()) { 1187 case Declarator::DK_Abstract: 1188 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 1189 return DeclarationName(); 1190 1191 case Declarator::DK_Normal: 1192 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 1193 return DeclarationName(D.getIdentifier()); 1194 1195 case Declarator::DK_Constructor: { 1196 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1197 Ty = Context.getCanonicalType(Ty); 1198 return Context.DeclarationNames.getCXXConstructorName(Ty); 1199 } 1200 1201 case Declarator::DK_Destructor: { 1202 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1203 Ty = Context.getCanonicalType(Ty); 1204 return Context.DeclarationNames.getCXXDestructorName(Ty); 1205 } 1206 1207 case Declarator::DK_Conversion: { 1208 // FIXME: We'd like to keep the non-canonical type for diagnostics! 1209 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1210 Ty = Context.getCanonicalType(Ty); 1211 return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 1212 } 1213 1214 case Declarator::DK_Operator: 1215 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 1216 return Context.DeclarationNames.getCXXOperatorName( 1217 D.getOverloadedOperator()); 1218 } 1219 1220 assert(false && "Unknown name kind"); 1221 return DeclarationName(); 1222} 1223 1224/// isNearlyMatchingFunction - Determine whether the C++ functions 1225/// Declaration and Definition are "nearly" matching. This heuristic 1226/// is used to improve diagnostics in the case where an out-of-line 1227/// function definition doesn't match any declaration within 1228/// the class or namespace. 1229static bool isNearlyMatchingFunction(ASTContext &Context, 1230 FunctionDecl *Declaration, 1231 FunctionDecl *Definition) { 1232 if (Declaration->param_size() != Definition->param_size()) 1233 return false; 1234 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1235 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1236 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1237 1238 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1239 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 1240 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1241 return false; 1242 } 1243 1244 return true; 1245} 1246 1247Sema::DeclTy * 1248Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl, 1249 bool IsFunctionDefinition) { 1250 NamedDecl *LastDeclarator = dyn_cast_or_null<NamedDecl>((Decl *)lastDecl); 1251 DeclarationName Name = GetNameForDeclarator(D); 1252 1253 // All of these full declarators require an identifier. If it doesn't have 1254 // one, the ParsedFreeStandingDeclSpec action should be used. 1255 if (!Name) { 1256 if (!D.getInvalidType()) // Reject this if we think it is valid. 1257 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1258 diag::err_declarator_need_ident) 1259 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1260 return 0; 1261 } 1262 1263 // The scope passed in may not be a decl scope. Zip up the scope tree until 1264 // we find one that is. 1265 while ((S->getFlags() & Scope::DeclScope) == 0 || 1266 (S->getFlags() & Scope::TemplateParamScope) != 0) 1267 S = S->getParent(); 1268 1269 DeclContext *DC; 1270 NamedDecl *PrevDecl; 1271 NamedDecl *New; 1272 bool InvalidDecl = false; 1273 1274 // See if this is a redefinition of a variable in the same scope. 1275 if (!D.getCXXScopeSpec().isSet() && !D.getCXXScopeSpec().isInvalid()) { 1276 DC = CurContext; 1277 PrevDecl = LookupName(S, Name, LookupOrdinaryName, true, true, 1278 D.getIdentifierLoc()); 1279 } else { // Something like "int foo::x;" 1280 DC = static_cast<DeclContext*>(D.getCXXScopeSpec().getScopeRep()); 1281 PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName, true); 1282 1283 // C++ 7.3.1.2p2: 1284 // Members (including explicit specializations of templates) of a named 1285 // namespace can also be defined outside that namespace by explicit 1286 // qualification of the name being defined, provided that the entity being 1287 // defined was already declared in the namespace and the definition appears 1288 // after the point of declaration in a namespace that encloses the 1289 // declarations namespace. 1290 // 1291 // Note that we only check the context at this point. We don't yet 1292 // have enough information to make sure that PrevDecl is actually 1293 // the declaration we want to match. For example, given: 1294 // 1295 // class X { 1296 // void f(); 1297 // void f(float); 1298 // }; 1299 // 1300 // void X::f(int) { } // ill-formed 1301 // 1302 // In this case, PrevDecl will point to the overload set 1303 // containing the two f's declared in X, but neither of them 1304 // matches. 1305 1306 // First check whether we named the global scope. 1307 if (isa<TranslationUnitDecl>(DC)) { 1308 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1309 << Name << D.getCXXScopeSpec().getRange(); 1310 } else if (!CurContext->Encloses(DC)) { 1311 // The qualifying scope doesn't enclose the original declaration. 1312 // Emit diagnostic based on current scope. 1313 SourceLocation L = D.getIdentifierLoc(); 1314 SourceRange R = D.getCXXScopeSpec().getRange(); 1315 if (isa<FunctionDecl>(CurContext)) 1316 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1317 else 1318 Diag(L, diag::err_invalid_declarator_scope) 1319 << Name << cast<NamedDecl>(DC) << R; 1320 InvalidDecl = true; 1321 } 1322 } 1323 1324 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1325 // Maybe we will complain about the shadowed template parameter. 1326 InvalidDecl = InvalidDecl 1327 || DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 1328 // Just pretend that we didn't see the previous declaration. 1329 PrevDecl = 0; 1330 } 1331 1332 // In C++, the previous declaration we find might be a tag type 1333 // (class or enum). In this case, the new declaration will hide the 1334 // tag type. Note that this does does not apply if we're declaring a 1335 // typedef (C++ [dcl.typedef]p4). 1336 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 1337 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1338 PrevDecl = 0; 1339 1340 QualType R = GetTypeForDeclarator(D, S); 1341 assert(!R.isNull() && "GetTypeForDeclarator() returned null type"); 1342 1343 bool Redeclaration = false; 1344 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1345 New = ActOnTypedefDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1346 InvalidDecl, Redeclaration); 1347 } else if (R.getTypePtr()->isFunctionType()) { 1348 New = ActOnFunctionDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1349 IsFunctionDefinition, InvalidDecl, 1350 Redeclaration); 1351 } else { 1352 New = ActOnVariableDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1353 InvalidDecl, Redeclaration); 1354 } 1355 1356 if (New == 0) 1357 return 0; 1358 1359 // Set the lexical context. If the declarator has a C++ scope specifier, the 1360 // lexical context will be different from the semantic context. 1361 New->setLexicalDeclContext(CurContext); 1362 1363 // If this has an identifier and is not an invalid redeclaration, 1364 // add it to the scope stack. 1365 if (Name && !(Redeclaration && InvalidDecl)) 1366 PushOnScopeChains(New, S); 1367 // If any semantic error occurred, mark the decl as invalid. 1368 if (D.getInvalidType() || InvalidDecl) 1369 New->setInvalidDecl(); 1370 1371 return New; 1372} 1373 1374NamedDecl* 1375Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1376 QualType R, Decl* LastDeclarator, 1377 Decl* PrevDecl, bool& InvalidDecl, 1378 bool &Redeclaration) { 1379 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1380 if (D.getCXXScopeSpec().isSet()) { 1381 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1382 << D.getCXXScopeSpec().getRange(); 1383 InvalidDecl = true; 1384 // Pretend we didn't see the scope specifier. 1385 DC = 0; 1386 } 1387 1388 // Check that there are no default arguments (C++ only). 1389 if (getLangOptions().CPlusPlus) 1390 CheckExtraCXXDefaultArguments(D); 1391 1392 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, LastDeclarator); 1393 if (!NewTD) return 0; 1394 1395 // Handle attributes prior to checking for duplicates in MergeVarDecl 1396 ProcessDeclAttributes(NewTD, D); 1397 // Merge the decl with the existing one if appropriate. If the decl is 1398 // in an outer scope, it isn't the same thing. 1399 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1400 Redeclaration = true; 1401 if (MergeTypeDefDecl(NewTD, PrevDecl)) 1402 InvalidDecl = true; 1403 } 1404 1405 if (S->getFnParent() == 0) { 1406 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1407 // then it shall have block scope. 1408 if (NewTD->getUnderlyingType()->isVariablyModifiedType()) { 1409 if (NewTD->getUnderlyingType()->isVariableArrayType()) 1410 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1411 else 1412 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1413 1414 InvalidDecl = true; 1415 } 1416 } 1417 return NewTD; 1418} 1419 1420NamedDecl* 1421Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1422 QualType R, Decl* LastDeclarator, 1423 Decl* PrevDecl, bool& InvalidDecl, 1424 bool &Redeclaration) { 1425 DeclarationName Name = GetNameForDeclarator(D); 1426 1427 // Check that there are no default arguments (C++ only). 1428 if (getLangOptions().CPlusPlus) 1429 CheckExtraCXXDefaultArguments(D); 1430 1431 if (R.getTypePtr()->isObjCInterfaceType()) { 1432 Diag(D.getIdentifierLoc(), diag::err_statically_allocated_object) 1433 << D.getIdentifier(); 1434 InvalidDecl = true; 1435 } 1436 1437 VarDecl *NewVD; 1438 VarDecl::StorageClass SC; 1439 switch (D.getDeclSpec().getStorageClassSpec()) { 1440 default: assert(0 && "Unknown storage class!"); 1441 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1442 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1443 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1444 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1445 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1446 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1447 case DeclSpec::SCS_mutable: 1448 // mutable can only appear on non-static class members, so it's always 1449 // an error here 1450 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1451 InvalidDecl = true; 1452 SC = VarDecl::None; 1453 break; 1454 } 1455 1456 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1457 if (!II) { 1458 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1459 << Name.getAsString(); 1460 return 0; 1461 } 1462 1463 if (DC->isRecord()) { 1464 // This is a static data member for a C++ class. 1465 NewVD = CXXClassVarDecl::Create(Context, cast<CXXRecordDecl>(DC), 1466 D.getIdentifierLoc(), II, 1467 R); 1468 } else { 1469 bool ThreadSpecified = D.getDeclSpec().isThreadSpecified(); 1470 if (S->getFnParent() == 0) { 1471 // C99 6.9p2: The storage-class specifiers auto and register shall not 1472 // appear in the declaration specifiers in an external declaration. 1473 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 1474 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 1475 InvalidDecl = true; 1476 } 1477 } 1478 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1479 II, R, SC, 1480 // FIXME: Move to DeclGroup... 1481 D.getDeclSpec().getSourceRange().getBegin()); 1482 NewVD->setThreadSpecified(ThreadSpecified); 1483 } 1484 NewVD->setNextDeclarator(LastDeclarator); 1485 1486 // Handle attributes prior to checking for duplicates in MergeVarDecl 1487 ProcessDeclAttributes(NewVD, D); 1488 1489 // Handle GNU asm-label extension (encoded as an attribute). 1490 if (Expr *E = (Expr*) D.getAsmLabel()) { 1491 // The parser guarantees this is a string. 1492 StringLiteral *SE = cast<StringLiteral>(E); 1493 NewVD->addAttr(new AsmLabelAttr(std::string(SE->getStrData(), 1494 SE->getByteLength()))); 1495 } 1496 1497 // Emit an error if an address space was applied to decl with local storage. 1498 // This includes arrays of objects with address space qualifiers, but not 1499 // automatic variables that point to other address spaces. 1500 // ISO/IEC TR 18037 S5.1.2 1501 if (NewVD->hasLocalStorage() && (NewVD->getType().getAddressSpace() != 0)) { 1502 Diag(D.getIdentifierLoc(), diag::err_as_qualified_auto_decl); 1503 InvalidDecl = true; 1504 } 1505 // Merge the decl with the existing one if appropriate. If the decl is 1506 // in an outer scope, it isn't the same thing. 1507 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1508 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 1509 // The user tried to define a non-static data member 1510 // out-of-line (C++ [dcl.meaning]p1). 1511 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 1512 << D.getCXXScopeSpec().getRange(); 1513 NewVD->Destroy(Context); 1514 return 0; 1515 } 1516 1517 Redeclaration = true; 1518 if (MergeVarDecl(NewVD, PrevDecl)) 1519 InvalidDecl = true; 1520 1521 if (D.getCXXScopeSpec().isSet()) { 1522 // No previous declaration in the qualifying scope. 1523 Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 1524 << Name << D.getCXXScopeSpec().getRange(); 1525 InvalidDecl = true; 1526 } 1527 } 1528 return NewVD; 1529} 1530 1531NamedDecl* 1532Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1533 QualType R, Decl *LastDeclarator, 1534 Decl* PrevDecl, bool IsFunctionDefinition, 1535 bool& InvalidDecl, bool &Redeclaration) { 1536 assert(R.getTypePtr()->isFunctionType()); 1537 1538 DeclarationName Name = GetNameForDeclarator(D); 1539 FunctionDecl::StorageClass SC = FunctionDecl::None; 1540 switch (D.getDeclSpec().getStorageClassSpec()) { 1541 default: assert(0 && "Unknown storage class!"); 1542 case DeclSpec::SCS_auto: 1543 case DeclSpec::SCS_register: 1544 case DeclSpec::SCS_mutable: 1545 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_func); 1546 InvalidDecl = true; 1547 break; 1548 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 1549 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 1550 case DeclSpec::SCS_static: SC = FunctionDecl::Static; break; 1551 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 1552 } 1553 1554 bool isInline = D.getDeclSpec().isInlineSpecified(); 1555 // bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1556 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 1557 1558 FunctionDecl *NewFD; 1559 if (D.getKind() == Declarator::DK_Constructor) { 1560 // This is a C++ constructor declaration. 1561 assert(DC->isRecord() && 1562 "Constructors can only be declared in a member context"); 1563 1564 InvalidDecl = InvalidDecl || CheckConstructorDeclarator(D, R, SC); 1565 1566 // Create the new declaration 1567 NewFD = CXXConstructorDecl::Create(Context, 1568 cast<CXXRecordDecl>(DC), 1569 D.getIdentifierLoc(), Name, R, 1570 isExplicit, isInline, 1571 /*isImplicitlyDeclared=*/false); 1572 1573 if (InvalidDecl) 1574 NewFD->setInvalidDecl(); 1575 } else if (D.getKind() == Declarator::DK_Destructor) { 1576 // This is a C++ destructor declaration. 1577 if (DC->isRecord()) { 1578 InvalidDecl = InvalidDecl || CheckDestructorDeclarator(D, R, SC); 1579 1580 NewFD = CXXDestructorDecl::Create(Context, 1581 cast<CXXRecordDecl>(DC), 1582 D.getIdentifierLoc(), Name, R, 1583 isInline, 1584 /*isImplicitlyDeclared=*/false); 1585 1586 if (InvalidDecl) 1587 NewFD->setInvalidDecl(); 1588 } else { 1589 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 1590 1591 // Create a FunctionDecl to satisfy the function definition parsing 1592 // code path. 1593 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 1594 Name, R, SC, isInline, 1595 // FIXME: Move to DeclGroup... 1596 D.getDeclSpec().getSourceRange().getBegin()); 1597 InvalidDecl = true; 1598 NewFD->setInvalidDecl(); 1599 } 1600 } else if (D.getKind() == Declarator::DK_Conversion) { 1601 if (!DC->isRecord()) { 1602 Diag(D.getIdentifierLoc(), 1603 diag::err_conv_function_not_member); 1604 return 0; 1605 } else { 1606 InvalidDecl = InvalidDecl || CheckConversionDeclarator(D, R, SC); 1607 1608 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 1609 D.getIdentifierLoc(), Name, R, 1610 isInline, isExplicit); 1611 1612 if (InvalidDecl) 1613 NewFD->setInvalidDecl(); 1614 } 1615 } else if (DC->isRecord()) { 1616 // This is a C++ method declaration. 1617 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 1618 D.getIdentifierLoc(), Name, R, 1619 (SC == FunctionDecl::Static), isInline); 1620 } else { 1621 NewFD = FunctionDecl::Create(Context, DC, 1622 D.getIdentifierLoc(), 1623 Name, R, SC, isInline, 1624 // FIXME: Move to DeclGroup... 1625 D.getDeclSpec().getSourceRange().getBegin()); 1626 } 1627 NewFD->setNextDeclarator(LastDeclarator); 1628 1629 // Set the lexical context. If the declarator has a C++ 1630 // scope specifier, the lexical context will be different 1631 // from the semantic context. 1632 NewFD->setLexicalDeclContext(CurContext); 1633 1634 // Handle GNU asm-label extension (encoded as an attribute). 1635 if (Expr *E = (Expr*) D.getAsmLabel()) { 1636 // The parser guarantees this is a string. 1637 StringLiteral *SE = cast<StringLiteral>(E); 1638 NewFD->addAttr(new AsmLabelAttr(std::string(SE->getStrData(), 1639 SE->getByteLength()))); 1640 } 1641 1642 // Copy the parameter declarations from the declarator D to 1643 // the function declaration NewFD, if they are available. 1644 if (D.getNumTypeObjects() > 0) { 1645 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1646 1647 // Create Decl objects for each parameter, adding them to the 1648 // FunctionDecl. 1649 llvm::SmallVector<ParmVarDecl*, 16> Params; 1650 1651 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 1652 // function that takes no arguments, not a function that takes a 1653 // single void argument. 1654 // We let through "const void" here because Sema::GetTypeForDeclarator 1655 // already checks for that case. 1656 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1657 FTI.ArgInfo[0].Param && 1658 ((ParmVarDecl*)FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 1659 // empty arg list, don't push any params. 1660 ParmVarDecl *Param = (ParmVarDecl*)FTI.ArgInfo[0].Param; 1661 1662 // In C++, the empty parameter-type-list must be spelled "void"; a 1663 // typedef of void is not permitted. 1664 if (getLangOptions().CPlusPlus && 1665 Param->getType().getUnqualifiedType() != Context.VoidTy) { 1666 Diag(Param->getLocation(), diag::ext_param_typedef_of_void); 1667 } 1668 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 1669 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 1670 Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 1671 } 1672 1673 NewFD->setParams(Context, &Params[0], Params.size()); 1674 } else if (R->getAsTypedefType()) { 1675 // When we're declaring a function with a typedef, as in the 1676 // following example, we'll need to synthesize (unnamed) 1677 // parameters for use in the declaration. 1678 // 1679 // @code 1680 // typedef void fn(int); 1681 // fn f; 1682 // @endcode 1683 const FunctionTypeProto *FT = R->getAsFunctionTypeProto(); 1684 if (!FT) { 1685 // This is a typedef of a function with no prototype, so we 1686 // don't need to do anything. 1687 } else if ((FT->getNumArgs() == 0) || 1688 (FT->getNumArgs() == 1 && !FT->isVariadic() && 1689 FT->getArgType(0)->isVoidType())) { 1690 // This is a zero-argument function. We don't need to do anything. 1691 } else { 1692 // Synthesize a parameter for each argument type. 1693 llvm::SmallVector<ParmVarDecl*, 16> Params; 1694 for (FunctionTypeProto::arg_type_iterator ArgType = FT->arg_type_begin(); 1695 ArgType != FT->arg_type_end(); ++ArgType) { 1696 Params.push_back(ParmVarDecl::Create(Context, DC, 1697 SourceLocation(), 0, 1698 *ArgType, VarDecl::None, 1699 0)); 1700 } 1701 1702 NewFD->setParams(Context, &Params[0], Params.size()); 1703 } 1704 } 1705 1706 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) 1707 InvalidDecl = InvalidDecl || CheckConstructor(Constructor); 1708 else if (isa<CXXDestructorDecl>(NewFD)) { 1709 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 1710 Record->setUserDeclaredDestructor(true); 1711 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 1712 // user-defined destructor. 1713 Record->setPOD(false); 1714 } else if (CXXConversionDecl *Conversion = 1715 dyn_cast<CXXConversionDecl>(NewFD)) 1716 ActOnConversionDeclarator(Conversion); 1717 1718 // Extra checking for C++ overloaded operators (C++ [over.oper]). 1719 if (NewFD->isOverloadedOperator() && 1720 CheckOverloadedOperatorDeclaration(NewFD)) 1721 NewFD->setInvalidDecl(); 1722 1723 // Merge the decl with the existing one if appropriate. Since C functions 1724 // are in a flat namespace, make sure we consider decls in outer scopes. 1725 bool OverloadableAttrRequired = false; 1726 if (PrevDecl && 1727 (!getLangOptions().CPlusPlus||isDeclInScope(PrevDecl, DC, S))) { 1728 // Determine whether NewFD is an overload of PrevDecl or 1729 // a declaration that requires merging. If it's an overload, 1730 // there's no more work to do here; we'll just add the new 1731 // function to the scope. 1732 OverloadedFunctionDecl::function_iterator MatchedDecl; 1733 1734 if (!getLangOptions().CPlusPlus && 1735 AllowOverloadingOfFunction(PrevDecl, Context)) 1736 OverloadableAttrRequired = true; 1737 1738 if (!AllowOverloadingOfFunction(PrevDecl, Context) || 1739 !IsOverload(NewFD, PrevDecl, MatchedDecl)) { 1740 Redeclaration = true; 1741 Decl *OldDecl = PrevDecl; 1742 1743 // If PrevDecl was an overloaded function, extract the 1744 // FunctionDecl that matched. 1745 if (isa<OverloadedFunctionDecl>(PrevDecl)) 1746 OldDecl = *MatchedDecl; 1747 1748 // NewFD and PrevDecl represent declarations that need to be 1749 // merged. 1750 if (MergeFunctionDecl(NewFD, OldDecl)) 1751 InvalidDecl = true; 1752 1753 if (!InvalidDecl) { 1754 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 1755 1756 // An out-of-line member function declaration must also be a 1757 // definition (C++ [dcl.meaning]p1). 1758 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 1759 !InvalidDecl) { 1760 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 1761 << D.getCXXScopeSpec().getRange(); 1762 NewFD->setInvalidDecl(); 1763 } 1764 } 1765 } 1766 } 1767 1768 if (D.getCXXScopeSpec().isSet() && 1769 (!PrevDecl || !Redeclaration)) { 1770 // The user tried to provide an out-of-line definition for a 1771 // function that is a member of a class or namespace, but there 1772 // was no such member function declared (C++ [class.mfct]p2, 1773 // C++ [namespace.memdef]p2). For example: 1774 // 1775 // class X { 1776 // void f() const; 1777 // }; 1778 // 1779 // void X::f() { } // ill-formed 1780 // 1781 // Complain about this problem, and attempt to suggest close 1782 // matches (e.g., those that differ only in cv-qualifiers and 1783 // whether the parameter types are references). 1784 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 1785 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 1786 InvalidDecl = true; 1787 1788 LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 1789 true); 1790 assert(!Prev.isAmbiguous() && 1791 "Cannot have an ambiguity in previous-declaration lookup"); 1792 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 1793 Func != FuncEnd; ++Func) { 1794 if (isa<FunctionDecl>(*Func) && 1795 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 1796 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 1797 } 1798 1799 PrevDecl = 0; 1800 } 1801 1802 // Handle attributes. We need to have merged decls when handling attributes 1803 // (for example to check for conflicts, etc). 1804 ProcessDeclAttributes(NewFD, D); 1805 AddKnownFunctionAttributes(NewFD); 1806 1807 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 1808 // If a function name is overloadable in C, then every function 1809 // with that name must be marked "overloadable". 1810 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 1811 << Redeclaration << NewFD; 1812 if (PrevDecl) 1813 Diag(PrevDecl->getLocation(), 1814 diag::note_attribute_overloadable_prev_overload); 1815 NewFD->addAttr(new OverloadableAttr); 1816 } 1817 1818 if (getLangOptions().CPlusPlus) { 1819 // In C++, check default arguments now that we have merged decls. Unless 1820 // the lexical context is the class, because in this case this is done 1821 // during delayed parsing anyway. 1822 if (!CurContext->isRecord()) 1823 CheckCXXDefaultArguments(NewFD); 1824 1825 // An out-of-line member function declaration must also be a 1826 // definition (C++ [dcl.meaning]p1). 1827 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && !InvalidDecl) { 1828 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 1829 << D.getCXXScopeSpec().getRange(); 1830 InvalidDecl = true; 1831 } 1832 } 1833 return NewFD; 1834} 1835 1836void Sema::InitializerElementNotConstant(const Expr *Init) { 1837 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 1838 << Init->getSourceRange(); 1839} 1840 1841bool Sema::CheckAddressConstantExpressionLValue(const Expr* Init) { 1842 switch (Init->getStmtClass()) { 1843 default: 1844 InitializerElementNotConstant(Init); 1845 return true; 1846 case Expr::ParenExprClass: { 1847 const ParenExpr* PE = cast<ParenExpr>(Init); 1848 return CheckAddressConstantExpressionLValue(PE->getSubExpr()); 1849 } 1850 case Expr::CompoundLiteralExprClass: 1851 return cast<CompoundLiteralExpr>(Init)->isFileScope(); 1852 case Expr::DeclRefExprClass: 1853 case Expr::QualifiedDeclRefExprClass: { 1854 const Decl *D = cast<DeclRefExpr>(Init)->getDecl(); 1855 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1856 if (VD->hasGlobalStorage()) 1857 return false; 1858 InitializerElementNotConstant(Init); 1859 return true; 1860 } 1861 if (isa<FunctionDecl>(D)) 1862 return false; 1863 InitializerElementNotConstant(Init); 1864 return true; 1865 } 1866 case Expr::MemberExprClass: { 1867 const MemberExpr *M = cast<MemberExpr>(Init); 1868 if (M->isArrow()) 1869 return CheckAddressConstantExpression(M->getBase()); 1870 return CheckAddressConstantExpressionLValue(M->getBase()); 1871 } 1872 case Expr::ArraySubscriptExprClass: { 1873 // FIXME: Should we pedwarn for "x[0+0]" (where x is a pointer)? 1874 const ArraySubscriptExpr *ASE = cast<ArraySubscriptExpr>(Init); 1875 return CheckAddressConstantExpression(ASE->getBase()) || 1876 CheckArithmeticConstantExpression(ASE->getIdx()); 1877 } 1878 case Expr::StringLiteralClass: 1879 case Expr::PredefinedExprClass: 1880 return false; 1881 case Expr::UnaryOperatorClass: { 1882 const UnaryOperator *Exp = cast<UnaryOperator>(Init); 1883 1884 // C99 6.6p9 1885 if (Exp->getOpcode() == UnaryOperator::Deref) 1886 return CheckAddressConstantExpression(Exp->getSubExpr()); 1887 1888 InitializerElementNotConstant(Init); 1889 return true; 1890 } 1891 } 1892} 1893 1894bool Sema::CheckAddressConstantExpression(const Expr* Init) { 1895 switch (Init->getStmtClass()) { 1896 default: 1897 InitializerElementNotConstant(Init); 1898 return true; 1899 case Expr::ParenExprClass: 1900 return CheckAddressConstantExpression(cast<ParenExpr>(Init)->getSubExpr()); 1901 case Expr::StringLiteralClass: 1902 case Expr::ObjCStringLiteralClass: 1903 return false; 1904 case Expr::CallExprClass: 1905 case Expr::CXXOperatorCallExprClass: 1906 // __builtin___CFStringMakeConstantString is a valid constant l-value. 1907 if (cast<CallExpr>(Init)->isBuiltinCall(Context) == 1908 Builtin::BI__builtin___CFStringMakeConstantString) 1909 return false; 1910 1911 InitializerElementNotConstant(Init); 1912 return true; 1913 1914 case Expr::UnaryOperatorClass: { 1915 const UnaryOperator *Exp = cast<UnaryOperator>(Init); 1916 1917 // C99 6.6p9 1918 if (Exp->getOpcode() == UnaryOperator::AddrOf) 1919 return CheckAddressConstantExpressionLValue(Exp->getSubExpr()); 1920 1921 if (Exp->getOpcode() == UnaryOperator::Extension) 1922 return CheckAddressConstantExpression(Exp->getSubExpr()); 1923 1924 InitializerElementNotConstant(Init); 1925 return true; 1926 } 1927 case Expr::BinaryOperatorClass: { 1928 // FIXME: Should we pedwarn for expressions like "a + 1 + 2"? 1929 const BinaryOperator *Exp = cast<BinaryOperator>(Init); 1930 1931 Expr *PExp = Exp->getLHS(); 1932 Expr *IExp = Exp->getRHS(); 1933 if (IExp->getType()->isPointerType()) 1934 std::swap(PExp, IExp); 1935 1936 // FIXME: Should we pedwarn if IExp isn't an integer constant expression? 1937 return CheckAddressConstantExpression(PExp) || 1938 CheckArithmeticConstantExpression(IExp); 1939 } 1940 case Expr::ImplicitCastExprClass: 1941 case Expr::CStyleCastExprClass: { 1942 const Expr* SubExpr = cast<CastExpr>(Init)->getSubExpr(); 1943 if (Init->getStmtClass() == Expr::ImplicitCastExprClass) { 1944 // Check for implicit promotion 1945 if (SubExpr->getType()->isFunctionType() || 1946 SubExpr->getType()->isArrayType()) 1947 return CheckAddressConstantExpressionLValue(SubExpr); 1948 } 1949 1950 // Check for pointer->pointer cast 1951 if (SubExpr->getType()->isPointerType()) 1952 return CheckAddressConstantExpression(SubExpr); 1953 1954 if (SubExpr->getType()->isIntegralType()) { 1955 // Check for the special-case of a pointer->int->pointer cast; 1956 // this isn't standard, but some code requires it. See 1957 // PR2720 for an example. 1958 if (const CastExpr* SubCast = dyn_cast<CastExpr>(SubExpr)) { 1959 if (SubCast->getSubExpr()->getType()->isPointerType()) { 1960 unsigned IntWidth = Context.getIntWidth(SubCast->getType()); 1961 unsigned PointerWidth = Context.getTypeSize(Context.VoidPtrTy); 1962 if (IntWidth >= PointerWidth) { 1963 return CheckAddressConstantExpression(SubCast->getSubExpr()); 1964 } 1965 } 1966 } 1967 } 1968 if (SubExpr->getType()->isArithmeticType()) { 1969 return CheckArithmeticConstantExpression(SubExpr); 1970 } 1971 1972 InitializerElementNotConstant(Init); 1973 return true; 1974 } 1975 case Expr::ConditionalOperatorClass: { 1976 // FIXME: Should we pedwarn here? 1977 const ConditionalOperator *Exp = cast<ConditionalOperator>(Init); 1978 if (!Exp->getCond()->getType()->isArithmeticType()) { 1979 InitializerElementNotConstant(Init); 1980 return true; 1981 } 1982 if (CheckArithmeticConstantExpression(Exp->getCond())) 1983 return true; 1984 if (Exp->getLHS() && 1985 CheckAddressConstantExpression(Exp->getLHS())) 1986 return true; 1987 return CheckAddressConstantExpression(Exp->getRHS()); 1988 } 1989 case Expr::AddrLabelExprClass: 1990 return false; 1991 } 1992} 1993 1994static const Expr* FindExpressionBaseAddress(const Expr* E); 1995 1996static const Expr* FindExpressionBaseAddressLValue(const Expr* E) { 1997 switch (E->getStmtClass()) { 1998 default: 1999 return E; 2000 case Expr::ParenExprClass: { 2001 const ParenExpr* PE = cast<ParenExpr>(E); 2002 return FindExpressionBaseAddressLValue(PE->getSubExpr()); 2003 } 2004 case Expr::MemberExprClass: { 2005 const MemberExpr *M = cast<MemberExpr>(E); 2006 if (M->isArrow()) 2007 return FindExpressionBaseAddress(M->getBase()); 2008 return FindExpressionBaseAddressLValue(M->getBase()); 2009 } 2010 case Expr::ArraySubscriptExprClass: { 2011 const ArraySubscriptExpr *ASE = cast<ArraySubscriptExpr>(E); 2012 return FindExpressionBaseAddress(ASE->getBase()); 2013 } 2014 case Expr::UnaryOperatorClass: { 2015 const UnaryOperator *Exp = cast<UnaryOperator>(E); 2016 2017 if (Exp->getOpcode() == UnaryOperator::Deref) 2018 return FindExpressionBaseAddress(Exp->getSubExpr()); 2019 2020 return E; 2021 } 2022 } 2023} 2024 2025static const Expr* FindExpressionBaseAddress(const Expr* E) { 2026 switch (E->getStmtClass()) { 2027 default: 2028 return E; 2029 case Expr::ParenExprClass: { 2030 const ParenExpr* PE = cast<ParenExpr>(E); 2031 return FindExpressionBaseAddress(PE->getSubExpr()); 2032 } 2033 case Expr::UnaryOperatorClass: { 2034 const UnaryOperator *Exp = cast<UnaryOperator>(E); 2035 2036 // C99 6.6p9 2037 if (Exp->getOpcode() == UnaryOperator::AddrOf) 2038 return FindExpressionBaseAddressLValue(Exp->getSubExpr()); 2039 2040 if (Exp->getOpcode() == UnaryOperator::Extension) 2041 return FindExpressionBaseAddress(Exp->getSubExpr()); 2042 2043 return E; 2044 } 2045 case Expr::BinaryOperatorClass: { 2046 const BinaryOperator *Exp = cast<BinaryOperator>(E); 2047 2048 Expr *PExp = Exp->getLHS(); 2049 Expr *IExp = Exp->getRHS(); 2050 if (IExp->getType()->isPointerType()) 2051 std::swap(PExp, IExp); 2052 2053 return FindExpressionBaseAddress(PExp); 2054 } 2055 case Expr::ImplicitCastExprClass: { 2056 const Expr* SubExpr = cast<ImplicitCastExpr>(E)->getSubExpr(); 2057 2058 // Check for implicit promotion 2059 if (SubExpr->getType()->isFunctionType() || 2060 SubExpr->getType()->isArrayType()) 2061 return FindExpressionBaseAddressLValue(SubExpr); 2062 2063 // Check for pointer->pointer cast 2064 if (SubExpr->getType()->isPointerType()) 2065 return FindExpressionBaseAddress(SubExpr); 2066 2067 // We assume that we have an arithmetic expression here; 2068 // if we don't, we'll figure it out later 2069 return 0; 2070 } 2071 case Expr::CStyleCastExprClass: { 2072 const Expr* SubExpr = cast<CastExpr>(E)->getSubExpr(); 2073 2074 // Check for pointer->pointer cast 2075 if (SubExpr->getType()->isPointerType()) 2076 return FindExpressionBaseAddress(SubExpr); 2077 2078 // We assume that we have an arithmetic expression here; 2079 // if we don't, we'll figure it out later 2080 return 0; 2081 } 2082 } 2083} 2084 2085bool Sema::CheckArithmeticConstantExpression(const Expr* Init) { 2086 switch (Init->getStmtClass()) { 2087 default: 2088 InitializerElementNotConstant(Init); 2089 return true; 2090 case Expr::ParenExprClass: { 2091 const ParenExpr* PE = cast<ParenExpr>(Init); 2092 return CheckArithmeticConstantExpression(PE->getSubExpr()); 2093 } 2094 case Expr::FloatingLiteralClass: 2095 case Expr::IntegerLiteralClass: 2096 case Expr::CharacterLiteralClass: 2097 case Expr::ImaginaryLiteralClass: 2098 case Expr::TypesCompatibleExprClass: 2099 case Expr::CXXBoolLiteralExprClass: 2100 return false; 2101 case Expr::CallExprClass: 2102 case Expr::CXXOperatorCallExprClass: { 2103 const CallExpr *CE = cast<CallExpr>(Init); 2104 2105 // Allow any constant foldable calls to builtins. 2106 if (CE->isBuiltinCall(Context) && CE->isEvaluatable(Context)) 2107 return false; 2108 2109 InitializerElementNotConstant(Init); 2110 return true; 2111 } 2112 case Expr::DeclRefExprClass: 2113 case Expr::QualifiedDeclRefExprClass: { 2114 const Decl *D = cast<DeclRefExpr>(Init)->getDecl(); 2115 if (isa<EnumConstantDecl>(D)) 2116 return false; 2117 InitializerElementNotConstant(Init); 2118 return true; 2119 } 2120 case Expr::CompoundLiteralExprClass: 2121 // Allow "(vector type){2,4}"; normal C constraints don't allow this, 2122 // but vectors are allowed to be magic. 2123 if (Init->getType()->isVectorType()) 2124 return false; 2125 InitializerElementNotConstant(Init); 2126 return true; 2127 case Expr::UnaryOperatorClass: { 2128 const UnaryOperator *Exp = cast<UnaryOperator>(Init); 2129 2130 switch (Exp->getOpcode()) { 2131 // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. 2132 // See C99 6.6p3. 2133 default: 2134 InitializerElementNotConstant(Init); 2135 return true; 2136 case UnaryOperator::OffsetOf: 2137 if (Exp->getSubExpr()->getType()->isConstantSizeType()) 2138 return false; 2139 InitializerElementNotConstant(Init); 2140 return true; 2141 case UnaryOperator::Extension: 2142 case UnaryOperator::LNot: 2143 case UnaryOperator::Plus: 2144 case UnaryOperator::Minus: 2145 case UnaryOperator::Not: 2146 return CheckArithmeticConstantExpression(Exp->getSubExpr()); 2147 } 2148 } 2149 case Expr::SizeOfAlignOfExprClass: { 2150 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(Init); 2151 // Special check for void types, which are allowed as an extension 2152 if (Exp->getTypeOfArgument()->isVoidType()) 2153 return false; 2154 // alignof always evaluates to a constant. 2155 // FIXME: is sizeof(int[3.0]) a constant expression? 2156 if (Exp->isSizeOf() && !Exp->getTypeOfArgument()->isConstantSizeType()) { 2157 InitializerElementNotConstant(Init); 2158 return true; 2159 } 2160 return false; 2161 } 2162 case Expr::BinaryOperatorClass: { 2163 const BinaryOperator *Exp = cast<BinaryOperator>(Init); 2164 2165 if (Exp->getLHS()->getType()->isArithmeticType() && 2166 Exp->getRHS()->getType()->isArithmeticType()) { 2167 return CheckArithmeticConstantExpression(Exp->getLHS()) || 2168 CheckArithmeticConstantExpression(Exp->getRHS()); 2169 } 2170 2171 if (Exp->getLHS()->getType()->isPointerType() && 2172 Exp->getRHS()->getType()->isPointerType()) { 2173 const Expr* LHSBase = FindExpressionBaseAddress(Exp->getLHS()); 2174 const Expr* RHSBase = FindExpressionBaseAddress(Exp->getRHS()); 2175 2176 // Only allow a null (constant integer) base; we could 2177 // allow some additional cases if necessary, but this 2178 // is sufficient to cover offsetof-like constructs. 2179 if (!LHSBase && !RHSBase) { 2180 return CheckAddressConstantExpression(Exp->getLHS()) || 2181 CheckAddressConstantExpression(Exp->getRHS()); 2182 } 2183 } 2184 2185 InitializerElementNotConstant(Init); 2186 return true; 2187 } 2188 case Expr::ImplicitCastExprClass: 2189 case Expr::CStyleCastExprClass: { 2190 const CastExpr *CE = cast<CastExpr>(Init); 2191 const Expr *SubExpr = CE->getSubExpr(); 2192 2193 if (SubExpr->getType()->isArithmeticType()) 2194 return CheckArithmeticConstantExpression(SubExpr); 2195 2196 if (SubExpr->getType()->isPointerType()) { 2197 const Expr* Base = FindExpressionBaseAddress(SubExpr); 2198 if (Base) { 2199 // the cast is only valid if done to a wide enough type 2200 if (Context.getTypeSize(CE->getType()) >= 2201 Context.getTypeSize(SubExpr->getType())) 2202 return false; 2203 } else { 2204 // If the pointer has a null base, this is an offsetof-like construct 2205 return CheckAddressConstantExpression(SubExpr); 2206 } 2207 } 2208 2209 InitializerElementNotConstant(Init); 2210 return true; 2211 } 2212 case Expr::ConditionalOperatorClass: { 2213 const ConditionalOperator *Exp = cast<ConditionalOperator>(Init); 2214 2215 // If GNU extensions are disabled, we require all operands to be arithmetic 2216 // constant expressions. 2217 if (getLangOptions().NoExtensions) { 2218 return CheckArithmeticConstantExpression(Exp->getCond()) || 2219 (Exp->getLHS() && CheckArithmeticConstantExpression(Exp->getLHS())) || 2220 CheckArithmeticConstantExpression(Exp->getRHS()); 2221 } 2222 2223 // Otherwise, we have to emulate some of the behavior of fold here. 2224 // Basically GCC treats things like "4 ? 1 : somefunc()" as a constant 2225 // because it can constant fold things away. To retain compatibility with 2226 // GCC code, we see if we can fold the condition to a constant (which we 2227 // should always be able to do in theory). If so, we only require the 2228 // specified arm of the conditional to be a constant. This is a horrible 2229 // hack, but is require by real world code that uses __builtin_constant_p. 2230 Expr::EvalResult EvalResult; 2231 if (!Exp->getCond()->Evaluate(EvalResult, Context) || 2232 EvalResult.HasSideEffects) { 2233 // If Evaluate couldn't fold it, CheckArithmeticConstantExpression 2234 // won't be able to either. Use it to emit the diagnostic though. 2235 bool Res = CheckArithmeticConstantExpression(Exp->getCond()); 2236 assert(Res && "Evaluate couldn't evaluate this constant?"); 2237 return Res; 2238 } 2239 2240 // Verify that the side following the condition is also a constant. 2241 const Expr *TrueSide = Exp->getLHS(), *FalseSide = Exp->getRHS(); 2242 if (EvalResult.Val.getInt() == 0) 2243 std::swap(TrueSide, FalseSide); 2244 2245 if (TrueSide && CheckArithmeticConstantExpression(TrueSide)) 2246 return true; 2247 2248 // Okay, the evaluated side evaluates to a constant, so we accept this. 2249 // Check to see if the other side is obviously not a constant. If so, 2250 // emit a warning that this is a GNU extension. 2251 if (FalseSide && !FalseSide->isEvaluatable(Context)) 2252 Diag(Init->getExprLoc(), 2253 diag::ext_typecheck_expression_not_constant_but_accepted) 2254 << FalseSide->getSourceRange(); 2255 return false; 2256 } 2257 } 2258} 2259 2260bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 2261 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) 2262 Init = DIE->getInit(); 2263 2264 Init = Init->IgnoreParens(); 2265 2266 if (Init->isEvaluatable(Context)) 2267 return false; 2268 2269 // Look through CXXDefaultArgExprs; they have no meaning in this context. 2270 if (CXXDefaultArgExpr* DAE = dyn_cast<CXXDefaultArgExpr>(Init)) 2271 return CheckForConstantInitializer(DAE->getExpr(), DclT); 2272 2273 if (CompoundLiteralExpr *e = dyn_cast<CompoundLiteralExpr>(Init)) 2274 return CheckForConstantInitializer(e->getInitializer(), DclT); 2275 2276 if (isa<ImplicitValueInitExpr>(Init)) { 2277 // FIXME: In C++, check for non-POD types. 2278 return false; 2279 } 2280 2281 if (InitListExpr *Exp = dyn_cast<InitListExpr>(Init)) { 2282 unsigned numInits = Exp->getNumInits(); 2283 for (unsigned i = 0; i < numInits; i++) { 2284 // FIXME: Need to get the type of the declaration for C++, 2285 // because it could be a reference? 2286 2287 if (CheckForConstantInitializer(Exp->getInit(i), 2288 Exp->getInit(i)->getType())) 2289 return true; 2290 } 2291 return false; 2292 } 2293 2294 // FIXME: We can probably remove some of this code below, now that 2295 // Expr::Evaluate is doing the heavy lifting for scalars. 2296 2297 if (Init->isNullPointerConstant(Context)) 2298 return false; 2299 if (Init->getType()->isArithmeticType()) { 2300 QualType InitTy = Context.getCanonicalType(Init->getType()) 2301 .getUnqualifiedType(); 2302 if (InitTy == Context.BoolTy) { 2303 // Special handling for pointers implicitly cast to bool; 2304 // (e.g. "_Bool rr = &rr;"). This is only legal at the top level. 2305 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Init)) { 2306 Expr* SubE = ICE->getSubExpr(); 2307 if (SubE->getType()->isPointerType() || 2308 SubE->getType()->isArrayType() || 2309 SubE->getType()->isFunctionType()) { 2310 return CheckAddressConstantExpression(Init); 2311 } 2312 } 2313 } else if (InitTy->isIntegralType()) { 2314 Expr* SubE = 0; 2315 if (CastExpr* CE = dyn_cast<CastExpr>(Init)) 2316 SubE = CE->getSubExpr(); 2317 // Special check for pointer cast to int; we allow as an extension 2318 // an address constant cast to an integer if the integer 2319 // is of an appropriate width (this sort of code is apparently used 2320 // in some places). 2321 // FIXME: Add pedwarn? 2322 // FIXME: Don't allow bitfields here! Need the FieldDecl for that. 2323 if (SubE && (SubE->getType()->isPointerType() || 2324 SubE->getType()->isArrayType() || 2325 SubE->getType()->isFunctionType())) { 2326 unsigned IntWidth = Context.getTypeSize(Init->getType()); 2327 unsigned PointerWidth = Context.getTypeSize(Context.VoidPtrTy); 2328 if (IntWidth >= PointerWidth) 2329 return CheckAddressConstantExpression(Init); 2330 } 2331 } 2332 2333 return CheckArithmeticConstantExpression(Init); 2334 } 2335 2336 if (Init->getType()->isPointerType()) 2337 return CheckAddressConstantExpression(Init); 2338 2339 // An array type at the top level that isn't an init-list must 2340 // be a string literal 2341 if (Init->getType()->isArrayType()) 2342 return false; 2343 2344 if (Init->getType()->isFunctionType()) 2345 return false; 2346 2347 // Allow block exprs at top level. 2348 if (Init->getType()->isBlockPointerType()) 2349 return false; 2350 2351 // GCC cast to union extension 2352 // note: the validity of the cast expr is checked by CheckCastTypes() 2353 if (CastExpr *C = dyn_cast<CastExpr>(Init)) { 2354 QualType T = C->getType(); 2355 return T->isUnionType() && CheckForConstantInitializer(C->getSubExpr(), T); 2356 } 2357 2358 InitializerElementNotConstant(Init); 2359 return true; 2360} 2361 2362void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init) { 2363 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 2364} 2365 2366/// AddInitializerToDecl - Adds the initializer Init to the 2367/// declaration dcl. If DirectInit is true, this is C++ direct 2368/// initialization rather than copy initialization. 2369void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init, bool DirectInit) { 2370 Decl *RealDecl = static_cast<Decl *>(dcl); 2371 Expr *Init = static_cast<Expr *>(init.release()); 2372 assert(Init && "missing initializer"); 2373 2374 // If there is no declaration, there was an error parsing it. Just ignore 2375 // the initializer. 2376 if (RealDecl == 0) { 2377 Init->Destroy(Context); 2378 return; 2379 } 2380 2381 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2382 if (!VDecl) { 2383 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2384 RealDecl->setInvalidDecl(); 2385 return; 2386 } 2387 // Get the decls type and save a reference for later, since 2388 // CheckInitializerTypes may change it. 2389 QualType DclT = VDecl->getType(), SavT = DclT; 2390 if (VDecl->isBlockVarDecl()) { 2391 VarDecl::StorageClass SC = VDecl->getStorageClass(); 2392 if (SC == VarDecl::Extern) { // C99 6.7.8p5 2393 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2394 VDecl->setInvalidDecl(); 2395 } else if (!VDecl->isInvalidDecl()) { 2396 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2397 VDecl->getDeclName(), DirectInit)) 2398 VDecl->setInvalidDecl(); 2399 2400 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2401 if (!getLangOptions().CPlusPlus) { 2402 if (SC == VarDecl::Static) // C99 6.7.8p4. 2403 CheckForConstantInitializer(Init, DclT); 2404 } 2405 } 2406 } else if (VDecl->isFileVarDecl()) { 2407 if (VDecl->getStorageClass() == VarDecl::Extern) 2408 Diag(VDecl->getLocation(), diag::warn_extern_init); 2409 if (!VDecl->isInvalidDecl()) 2410 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2411 VDecl->getDeclName(), DirectInit)) 2412 VDecl->setInvalidDecl(); 2413 2414 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2415 if (!getLangOptions().CPlusPlus) { 2416 // C99 6.7.8p4. All file scoped initializers need to be constant. 2417 CheckForConstantInitializer(Init, DclT); 2418 } 2419 } 2420 // If the type changed, it means we had an incomplete type that was 2421 // completed by the initializer. For example: 2422 // int ary[] = { 1, 3, 5 }; 2423 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2424 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2425 VDecl->setType(DclT); 2426 Init->setType(DclT); 2427 } 2428 2429 // Attach the initializer to the decl. 2430 VDecl->setInit(Init); 2431 return; 2432} 2433 2434void Sema::ActOnUninitializedDecl(DeclTy *dcl) { 2435 Decl *RealDecl = static_cast<Decl *>(dcl); 2436 2437 // If there is no declaration, there was an error parsing it. Just ignore it. 2438 if (RealDecl == 0) 2439 return; 2440 2441 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2442 QualType Type = Var->getType(); 2443 // C++ [dcl.init.ref]p3: 2444 // The initializer can be omitted for a reference only in a 2445 // parameter declaration (8.3.5), in the declaration of a 2446 // function return type, in the declaration of a class member 2447 // within its class declaration (9.2), and where the extern 2448 // specifier is explicitly used. 2449 if (Type->isReferenceType() && 2450 Var->getStorageClass() != VarDecl::Extern && 2451 Var->getStorageClass() != VarDecl::PrivateExtern) { 2452 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2453 << Var->getDeclName() 2454 << SourceRange(Var->getLocation(), Var->getLocation()); 2455 Var->setInvalidDecl(); 2456 return; 2457 } 2458 2459 // C++ [dcl.init]p9: 2460 // 2461 // If no initializer is specified for an object, and the object 2462 // is of (possibly cv-qualified) non-POD class type (or array 2463 // thereof), the object shall be default-initialized; if the 2464 // object is of const-qualified type, the underlying class type 2465 // shall have a user-declared default constructor. 2466 if (getLangOptions().CPlusPlus) { 2467 QualType InitType = Type; 2468 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2469 InitType = Array->getElementType(); 2470 if (Var->getStorageClass() != VarDecl::Extern && 2471 Var->getStorageClass() != VarDecl::PrivateExtern && 2472 InitType->isRecordType()) { 2473 const CXXConstructorDecl *Constructor 2474 = PerformInitializationByConstructor(InitType, 0, 0, 2475 Var->getLocation(), 2476 SourceRange(Var->getLocation(), 2477 Var->getLocation()), 2478 Var->getDeclName(), 2479 IK_Default); 2480 if (!Constructor) 2481 Var->setInvalidDecl(); 2482 } 2483 } 2484 2485#if 0 2486 // FIXME: Temporarily disabled because we are not properly parsing 2487 // linkage specifications on declarations, e.g., 2488 // 2489 // extern "C" const CGPoint CGPointerZero; 2490 // 2491 // C++ [dcl.init]p9: 2492 // 2493 // If no initializer is specified for an object, and the 2494 // object is of (possibly cv-qualified) non-POD class type (or 2495 // array thereof), the object shall be default-initialized; if 2496 // the object is of const-qualified type, the underlying class 2497 // type shall have a user-declared default 2498 // constructor. Otherwise, if no initializer is specified for 2499 // an object, the object and its subobjects, if any, have an 2500 // indeterminate initial value; if the object or any of its 2501 // subobjects are of const-qualified type, the program is 2502 // ill-formed. 2503 // 2504 // This isn't technically an error in C, so we don't diagnose it. 2505 // 2506 // FIXME: Actually perform the POD/user-defined default 2507 // constructor check. 2508 if (getLangOptions().CPlusPlus && 2509 Context.getCanonicalType(Type).isConstQualified() && 2510 Var->getStorageClass() != VarDecl::Extern) 2511 Diag(Var->getLocation(), diag::err_const_var_requires_init) 2512 << Var->getName() 2513 << SourceRange(Var->getLocation(), Var->getLocation()); 2514#endif 2515 } 2516} 2517 2518/// The declarators are chained together backwards, reverse the list. 2519Sema::DeclTy *Sema::FinalizeDeclaratorGroup(Scope *S, DeclTy *group) { 2520 // Often we have single declarators, handle them quickly. 2521 Decl *GroupDecl = static_cast<Decl*>(group); 2522 if (GroupDecl == 0) 2523 return 0; 2524 2525 Decl *Group = dyn_cast<Decl>(GroupDecl); 2526 Decl *NewGroup = 0; 2527 if (Group->getNextDeclarator() == 0) 2528 NewGroup = Group; 2529 else { // reverse the list. 2530 while (Group) { 2531 Decl *Next = Group->getNextDeclarator(); 2532 Group->setNextDeclarator(NewGroup); 2533 NewGroup = Group; 2534 Group = Next; 2535 } 2536 } 2537 // Perform semantic analysis that depends on having fully processed both 2538 // the declarator and initializer. 2539 for (Decl *ID = NewGroup; ID; ID = ID->getNextDeclarator()) { 2540 VarDecl *IDecl = dyn_cast<VarDecl>(ID); 2541 if (!IDecl) 2542 continue; 2543 QualType T = IDecl->getType(); 2544 2545 if (T->isVariableArrayType()) { 2546 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2547 2548 // FIXME: This won't give the correct result for 2549 // int a[10][n]; 2550 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2551 if (IDecl->isFileVarDecl()) { 2552 Diag(IDecl->getLocation(), diag::err_vla_decl_in_file_scope) << 2553 SizeRange; 2554 2555 IDecl->setInvalidDecl(); 2556 } else { 2557 // C99 6.7.5.2p2: If an identifier is declared to be an object with 2558 // static storage duration, it shall not have a variable length array. 2559 if (IDecl->getStorageClass() == VarDecl::Static) { 2560 Diag(IDecl->getLocation(), diag::err_vla_decl_has_static_storage) 2561 << SizeRange; 2562 IDecl->setInvalidDecl(); 2563 } else if (IDecl->getStorageClass() == VarDecl::Extern) { 2564 Diag(IDecl->getLocation(), diag::err_vla_decl_has_extern_linkage) 2565 << SizeRange; 2566 IDecl->setInvalidDecl(); 2567 } 2568 } 2569 } else if (T->isVariablyModifiedType()) { 2570 if (IDecl->isFileVarDecl()) { 2571 Diag(IDecl->getLocation(), diag::err_vm_decl_in_file_scope); 2572 IDecl->setInvalidDecl(); 2573 } else { 2574 if (IDecl->getStorageClass() == VarDecl::Extern) { 2575 Diag(IDecl->getLocation(), diag::err_vm_decl_has_extern_linkage); 2576 IDecl->setInvalidDecl(); 2577 } 2578 } 2579 } 2580 2581 // Block scope. C99 6.7p7: If an identifier for an object is declared with 2582 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 2583 if (IDecl->isBlockVarDecl() && 2584 IDecl->getStorageClass() != VarDecl::Extern) { 2585 if (!IDecl->isInvalidDecl() && 2586 DiagnoseIncompleteType(IDecl->getLocation(), T, 2587 diag::err_typecheck_decl_incomplete_type)) 2588 IDecl->setInvalidDecl(); 2589 } 2590 // File scope. C99 6.9.2p2: A declaration of an identifier for and 2591 // object that has file scope without an initializer, and without a 2592 // storage-class specifier or with the storage-class specifier "static", 2593 // constitutes a tentative definition. Note: A tentative definition with 2594 // external linkage is valid (C99 6.2.2p5). 2595 if (isTentativeDefinition(IDecl)) { 2596 if (T->isIncompleteArrayType()) { 2597 // C99 6.9.2 (p2, p5): Implicit initialization causes an incomplete 2598 // array to be completed. Don't issue a diagnostic. 2599 } else if (!IDecl->isInvalidDecl() && 2600 DiagnoseIncompleteType(IDecl->getLocation(), T, 2601 diag::err_typecheck_decl_incomplete_type)) 2602 // C99 6.9.2p3: If the declaration of an identifier for an object is 2603 // a tentative definition and has internal linkage (C99 6.2.2p3), the 2604 // declared type shall not be an incomplete type. 2605 IDecl->setInvalidDecl(); 2606 } 2607 if (IDecl->isFileVarDecl()) 2608 CheckForFileScopedRedefinitions(S, IDecl); 2609 } 2610 return NewGroup; 2611} 2612 2613/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 2614/// to introduce parameters into function prototype scope. 2615Sema::DeclTy * 2616Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 2617 const DeclSpec &DS = D.getDeclSpec(); 2618 2619 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 2620 VarDecl::StorageClass StorageClass = VarDecl::None; 2621 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2622 StorageClass = VarDecl::Register; 2623 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2624 Diag(DS.getStorageClassSpecLoc(), 2625 diag::err_invalid_storage_class_in_func_decl); 2626 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2627 } 2628 if (DS.isThreadSpecified()) { 2629 Diag(DS.getThreadSpecLoc(), 2630 diag::err_invalid_storage_class_in_func_decl); 2631 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2632 } 2633 2634 // Check that there are no default arguments inside the type of this 2635 // parameter (C++ only). 2636 if (getLangOptions().CPlusPlus) 2637 CheckExtraCXXDefaultArguments(D); 2638 2639 // In this context, we *do not* check D.getInvalidType(). If the declarator 2640 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 2641 // though it will not reflect the user specified type. 2642 QualType parmDeclType = GetTypeForDeclarator(D, S); 2643 2644 assert(!parmDeclType.isNull() && "GetTypeForDeclarator() returned null type"); 2645 2646 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 2647 // Can this happen for params? We already checked that they don't conflict 2648 // among each other. Here they can only shadow globals, which is ok. 2649 IdentifierInfo *II = D.getIdentifier(); 2650 if (II) { 2651 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2652 if (PrevDecl->isTemplateParameter()) { 2653 // Maybe we will complain about the shadowed template parameter. 2654 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2655 // Just pretend that we didn't see the previous declaration. 2656 PrevDecl = 0; 2657 } else if (S->isDeclScope(PrevDecl)) { 2658 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 2659 2660 // Recover by removing the name 2661 II = 0; 2662 D.SetIdentifier(0, D.getIdentifierLoc()); 2663 } 2664 } 2665 } 2666 2667 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 2668 // Doing the promotion here has a win and a loss. The win is the type for 2669 // both Decl's and DeclRefExpr's will match (a convenient invariant for the 2670 // code generator). The loss is the orginal type isn't preserved. For example: 2671 // 2672 // void func(int parmvardecl[5]) { // convert "int [5]" to "int *" 2673 // int blockvardecl[5]; 2674 // sizeof(parmvardecl); // size == 4 2675 // sizeof(blockvardecl); // size == 20 2676 // } 2677 // 2678 // For expressions, all implicit conversions are captured using the 2679 // ImplicitCastExpr AST node (we have no such mechanism for Decl's). 2680 // 2681 // FIXME: If a source translation tool needs to see the original type, then 2682 // we need to consider storing both types (in ParmVarDecl)... 2683 // 2684 if (parmDeclType->isArrayType()) { 2685 // int x[restrict 4] -> int *restrict 2686 parmDeclType = Context.getArrayDecayedType(parmDeclType); 2687 } else if (parmDeclType->isFunctionType()) 2688 parmDeclType = Context.getPointerType(parmDeclType); 2689 2690 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, 2691 D.getIdentifierLoc(), II, 2692 parmDeclType, StorageClass, 2693 0); 2694 2695 if (D.getInvalidType()) 2696 New->setInvalidDecl(); 2697 2698 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 2699 if (D.getCXXScopeSpec().isSet()) { 2700 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 2701 << D.getCXXScopeSpec().getRange(); 2702 New->setInvalidDecl(); 2703 } 2704 2705 // Add the parameter declaration into this scope. 2706 S->AddDecl(New); 2707 if (II) 2708 IdResolver.AddDecl(New); 2709 2710 ProcessDeclAttributes(New, D); 2711 return New; 2712 2713} 2714 2715void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D) { 2716 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2717 "Not a function declarator!"); 2718 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2719 2720 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 2721 // for a K&R function. 2722 if (!FTI.hasPrototype) { 2723 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2724 if (FTI.ArgInfo[i].Param == 0) { 2725 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 2726 << FTI.ArgInfo[i].Ident; 2727 // Implicitly declare the argument as type 'int' for lack of a better 2728 // type. 2729 DeclSpec DS; 2730 const char* PrevSpec; // unused 2731 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 2732 PrevSpec); 2733 Declarator ParamD(DS, Declarator::KNRTypeListContext); 2734 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 2735 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 2736 } 2737 } 2738 } 2739} 2740 2741Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 2742 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 2743 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2744 "Not a function declarator!"); 2745 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2746 2747 if (FTI.hasPrototype) { 2748 // FIXME: Diagnose arguments without names in C. 2749 } 2750 2751 Scope *ParentScope = FnBodyScope->getParent(); 2752 2753 return ActOnStartOfFunctionDef(FnBodyScope, 2754 ActOnDeclarator(ParentScope, D, 0, 2755 /*IsFunctionDefinition=*/true)); 2756} 2757 2758Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclTy *D) { 2759 Decl *decl = static_cast<Decl*>(D); 2760 FunctionDecl *FD = cast<FunctionDecl>(decl); 2761 2762 // See if this is a redefinition. 2763 const FunctionDecl *Definition; 2764 if (FD->getBody(Definition)) { 2765 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 2766 Diag(Definition->getLocation(), diag::note_previous_definition); 2767 } 2768 2769 // Builtin functions cannot be defined. 2770 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 2771 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2772 Diag(FD->getLocation(), diag::err_builtin_lib_definition) << FD; 2773 Diag(FD->getLocation(), diag::note_builtin_lib_def_freestanding); 2774 } else 2775 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 2776 FD->setInvalidDecl(); 2777 } 2778 2779 PushDeclContext(FnBodyScope, FD); 2780 2781 // Check the validity of our function parameters 2782 CheckParmsForFunctionDef(FD); 2783 2784 // Introduce our parameters into the function scope 2785 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 2786 ParmVarDecl *Param = FD->getParamDecl(p); 2787 Param->setOwningFunction(FD); 2788 2789 // If this has an identifier, add it to the scope stack. 2790 if (Param->getIdentifier()) 2791 PushOnScopeChains(Param, FnBodyScope); 2792 } 2793 2794 // Checking attributes of current function definition 2795 // dllimport attribute. 2796 if (FD->getAttr<DLLImportAttr>() && (!FD->getAttr<DLLExportAttr>())) { 2797 // dllimport attribute cannot be applied to definition. 2798 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 2799 Diag(FD->getLocation(), 2800 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 2801 << "dllimport"; 2802 FD->setInvalidDecl(); 2803 return FD; 2804 } else { 2805 // If a symbol previously declared dllimport is later defined, the 2806 // attribute is ignored in subsequent references, and a warning is 2807 // emitted. 2808 Diag(FD->getLocation(), 2809 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 2810 << FD->getNameAsCString() << "dllimport"; 2811 } 2812 } 2813 return FD; 2814} 2815 2816Sema::DeclTy *Sema::ActOnFinishFunctionBody(DeclTy *D, StmtArg BodyArg) { 2817 Decl *dcl = static_cast<Decl *>(D); 2818 Stmt *Body = static_cast<Stmt*>(BodyArg.release()); 2819 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 2820 FD->setBody(Body); 2821 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 2822 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 2823 MD->setBody((Stmt*)Body); 2824 } else { 2825 Body->Destroy(Context); 2826 return 0; 2827 } 2828 PopDeclContext(); 2829 // Verify and clean out per-function state. 2830 2831 // Check goto/label use. 2832 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 2833 I = LabelMap.begin(), E = LabelMap.end(); I != E; ++I) { 2834 // Verify that we have no forward references left. If so, there was a goto 2835 // or address of a label taken, but no definition of it. Label fwd 2836 // definitions are indicated with a null substmt. 2837 if (I->second->getSubStmt() == 0) { 2838 LabelStmt *L = I->second; 2839 // Emit error. 2840 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 2841 2842 // At this point, we have gotos that use the bogus label. Stitch it into 2843 // the function body so that they aren't leaked and that the AST is well 2844 // formed. 2845 if (Body) { 2846#if 0 2847 // FIXME: Why do this? Having a 'push_back' in CompoundStmt is ugly, 2848 // and the AST is malformed anyway. We should just blow away 'L'. 2849 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 2850 cast<CompoundStmt>(Body)->push_back(L); 2851#else 2852 L->Destroy(Context); 2853#endif 2854 } else { 2855 // The whole function wasn't parsed correctly, just delete this. 2856 L->Destroy(Context); 2857 } 2858 } 2859 } 2860 LabelMap.clear(); 2861 2862 return D; 2863} 2864 2865/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 2866/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 2867NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 2868 IdentifierInfo &II, Scope *S) { 2869 // Extension in C99. Legal in C90, but warn about it. 2870 if (getLangOptions().C99) 2871 Diag(Loc, diag::ext_implicit_function_decl) << &II; 2872 else 2873 Diag(Loc, diag::warn_implicit_function_decl) << &II; 2874 2875 // FIXME: handle stuff like: 2876 // void foo() { extern float X(); } 2877 // void bar() { X(); } <-- implicit decl for X in another scope. 2878 2879 // Set a Declarator for the implicit definition: int foo(); 2880 const char *Dummy; 2881 DeclSpec DS; 2882 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 2883 Error = Error; // Silence warning. 2884 assert(!Error && "Error setting up implicit decl!"); 2885 Declarator D(DS, Declarator::BlockContext); 2886 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, 0, 0, 0, Loc, D), 2887 SourceLocation()); 2888 D.SetIdentifier(&II, Loc); 2889 2890 // Insert this function into translation-unit scope. 2891 2892 DeclContext *PrevDC = CurContext; 2893 CurContext = Context.getTranslationUnitDecl(); 2894 2895 FunctionDecl *FD = 2896 dyn_cast<FunctionDecl>(static_cast<Decl*>(ActOnDeclarator(TUScope, D, 0))); 2897 FD->setImplicit(); 2898 2899 CurContext = PrevDC; 2900 2901 AddKnownFunctionAttributes(FD); 2902 2903 return FD; 2904} 2905 2906/// \brief Adds any function attributes that we know a priori based on 2907/// the declaration of this function. 2908/// 2909/// These attributes can apply both to implicitly-declared builtins 2910/// (like __builtin___printf_chk) or to library-declared functions 2911/// like NSLog or printf. 2912void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 2913 if (FD->isInvalidDecl()) 2914 return; 2915 2916 // If this is a built-in function, map its builtin attributes to 2917 // actual attributes. 2918 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 2919 // Handle printf-formatting attributes. 2920 unsigned FormatIdx; 2921 bool HasVAListArg; 2922 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 2923 if (!FD->getAttr<FormatAttr>()) 2924 FD->addAttr(new FormatAttr("printf", FormatIdx + 1, FormatIdx + 2)); 2925 } 2926 } 2927 2928 IdentifierInfo *Name = FD->getIdentifier(); 2929 if (!Name) 2930 return; 2931 if ((!getLangOptions().CPlusPlus && 2932 FD->getDeclContext()->isTranslationUnit()) || 2933 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 2934 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 2935 LinkageSpecDecl::lang_c)) { 2936 // Okay: this could be a libc/libm/Objective-C function we know 2937 // about. 2938 } else 2939 return; 2940 2941 unsigned KnownID; 2942 for (KnownID = 0; KnownID != id_num_known_functions; ++KnownID) 2943 if (KnownFunctionIDs[KnownID] == Name) 2944 break; 2945 2946 switch (KnownID) { 2947 case id_NSLog: 2948 case id_NSLogv: 2949 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 2950 // FIXME: We known better than our headers. 2951 const_cast<FormatAttr *>(Format)->setType("printf"); 2952 } else 2953 FD->addAttr(new FormatAttr("printf", 1, 2)); 2954 break; 2955 2956 case id_asprintf: 2957 case id_vasprintf: 2958 if (!FD->getAttr<FormatAttr>()) 2959 FD->addAttr(new FormatAttr("printf", 2, 3)); 2960 break; 2961 2962 default: 2963 // Unknown function or known function without any attributes to 2964 // add. Do nothing. 2965 break; 2966 } 2967} 2968 2969TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 2970 Decl *LastDeclarator) { 2971 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 2972 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 2973 2974 // Scope manipulation handled by caller. 2975 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 2976 D.getIdentifierLoc(), 2977 D.getIdentifier(), 2978 T); 2979 NewTD->setNextDeclarator(LastDeclarator); 2980 if (D.getInvalidType()) 2981 NewTD->setInvalidDecl(); 2982 return NewTD; 2983} 2984 2985/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 2986/// former case, Name will be non-null. In the later case, Name will be null. 2987/// TagSpec indicates what kind of tag this is. TK indicates whether this is a 2988/// reference/declaration/definition of a tag. 2989Sema::DeclTy *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, 2990 SourceLocation KWLoc, const CXXScopeSpec &SS, 2991 IdentifierInfo *Name, SourceLocation NameLoc, 2992 AttributeList *Attr) { 2993 // If this is not a definition, it must have a name. 2994 assert((Name != 0 || TK == TK_Definition) && 2995 "Nameless record must be a definition!"); 2996 2997 TagDecl::TagKind Kind; 2998 switch (TagSpec) { 2999 default: assert(0 && "Unknown tag type!"); 3000 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 3001 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 3002 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 3003 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 3004 } 3005 3006 DeclContext *SearchDC = CurContext; 3007 DeclContext *DC = CurContext; 3008 NamedDecl *PrevDecl = 0; 3009 3010 bool Invalid = false; 3011 3012 if (Name && SS.isNotEmpty()) { 3013 // We have a nested-name tag ('struct foo::bar'). 3014 3015 // Check for invalid 'foo::'. 3016 if (SS.isInvalid()) { 3017 Name = 0; 3018 goto CreateNewDecl; 3019 } 3020 3021 DC = static_cast<DeclContext*>(SS.getScopeRep()); 3022 SearchDC = DC; 3023 // Look-up name inside 'foo::'. 3024 PrevDecl = dyn_cast_or_null<TagDecl>( 3025 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 3026 3027 // A tag 'foo::bar' must already exist. 3028 if (PrevDecl == 0) { 3029 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 3030 Name = 0; 3031 goto CreateNewDecl; 3032 } 3033 } else if (Name) { 3034 // If this is a named struct, check to see if there was a previous forward 3035 // declaration or definition. 3036 // FIXME: We're looking into outer scopes here, even when we 3037 // shouldn't be. Doing so can result in ambiguities that we 3038 // shouldn't be diagnosing. 3039 LookupResult R = LookupName(S, Name, LookupTagName, 3040 /*RedeclarationOnly=*/(TK != TK_Reference)); 3041 if (R.isAmbiguous()) { 3042 DiagnoseAmbiguousLookup(R, Name, NameLoc); 3043 // FIXME: This is not best way to recover from case like: 3044 // 3045 // struct S s; 3046 // 3047 // causes needless err_ovl_no_viable_function_in_init latter. 3048 Name = 0; 3049 PrevDecl = 0; 3050 Invalid = true; 3051 } 3052 else 3053 PrevDecl = R; 3054 3055 if (!getLangOptions().CPlusPlus && TK != TK_Reference) { 3056 // FIXME: This makes sure that we ignore the contexts associated 3057 // with C structs, unions, and enums when looking for a matching 3058 // tag declaration or definition. See the similar lookup tweak 3059 // in Sema::LookupName; is there a better way to deal with this? 3060 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 3061 SearchDC = SearchDC->getParent(); 3062 } 3063 } 3064 3065 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3066 // Maybe we will complain about the shadowed template parameter. 3067 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 3068 // Just pretend that we didn't see the previous declaration. 3069 PrevDecl = 0; 3070 } 3071 3072 if (PrevDecl) { 3073 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 3074 // If this is a use of a previous tag, or if the tag is already declared 3075 // in the same scope (so that the definition/declaration completes or 3076 // rementions the tag), reuse the decl. 3077 if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { 3078 // Make sure that this wasn't declared as an enum and now used as a 3079 // struct or something similar. 3080 if (PrevTagDecl->getTagKind() != Kind) { 3081 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 3082 Diag(PrevDecl->getLocation(), diag::note_previous_use); 3083 // Recover by making this an anonymous redefinition. 3084 Name = 0; 3085 PrevDecl = 0; 3086 Invalid = true; 3087 } else { 3088 // If this is a use, just return the declaration we found. 3089 3090 // FIXME: In the future, return a variant or some other clue 3091 // for the consumer of this Decl to know it doesn't own it. 3092 // For our current ASTs this shouldn't be a problem, but will 3093 // need to be changed with DeclGroups. 3094 if (TK == TK_Reference) 3095 return PrevDecl; 3096 3097 // Diagnose attempts to redefine a tag. 3098 if (TK == TK_Definition) { 3099 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 3100 Diag(NameLoc, diag::err_redefinition) << Name; 3101 Diag(Def->getLocation(), diag::note_previous_definition); 3102 // If this is a redefinition, recover by making this 3103 // struct be anonymous, which will make any later 3104 // references get the previous definition. 3105 Name = 0; 3106 PrevDecl = 0; 3107 Invalid = true; 3108 } else { 3109 // If the type is currently being defined, complain 3110 // about a nested redefinition. 3111 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 3112 if (Tag->isBeingDefined()) { 3113 Diag(NameLoc, diag::err_nested_redefinition) << Name; 3114 Diag(PrevTagDecl->getLocation(), 3115 diag::note_previous_definition); 3116 Name = 0; 3117 PrevDecl = 0; 3118 Invalid = true; 3119 } 3120 } 3121 3122 // Okay, this is definition of a previously declared or referenced 3123 // tag PrevDecl. We're going to create a new Decl for it. 3124 } 3125 } 3126 // If we get here we have (another) forward declaration or we 3127 // have a definition. Just create a new decl. 3128 } else { 3129 // If we get here, this is a definition of a new tag type in a nested 3130 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 3131 // new decl/type. We set PrevDecl to NULL so that the entities 3132 // have distinct types. 3133 PrevDecl = 0; 3134 } 3135 // If we get here, we're going to create a new Decl. If PrevDecl 3136 // is non-NULL, it's a definition of the tag declared by 3137 // PrevDecl. If it's NULL, we have a new definition. 3138 } else { 3139 // PrevDecl is a namespace, template, or anything else 3140 // that lives in the IDNS_Tag identifier namespace. 3141 if (isDeclInScope(PrevDecl, SearchDC, S)) { 3142 // The tag name clashes with a namespace name, issue an error and 3143 // recover by making this tag be anonymous. 3144 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 3145 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3146 Name = 0; 3147 PrevDecl = 0; 3148 Invalid = true; 3149 } else { 3150 // The existing declaration isn't relevant to us; we're in a 3151 // new scope, so clear out the previous declaration. 3152 PrevDecl = 0; 3153 } 3154 } 3155 } else if (TK == TK_Reference && SS.isEmpty() && Name && 3156 (Kind != TagDecl::TK_enum)) { 3157 // C++ [basic.scope.pdecl]p5: 3158 // -- for an elaborated-type-specifier of the form 3159 // 3160 // class-key identifier 3161 // 3162 // if the elaborated-type-specifier is used in the 3163 // decl-specifier-seq or parameter-declaration-clause of a 3164 // function defined in namespace scope, the identifier is 3165 // declared as a class-name in the namespace that contains 3166 // the declaration; otherwise, except as a friend 3167 // declaration, the identifier is declared in the smallest 3168 // non-class, non-function-prototype scope that contains the 3169 // declaration. 3170 // 3171 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 3172 // C structs and unions. 3173 3174 // Find the context where we'll be declaring the tag. 3175 // FIXME: We would like to maintain the current DeclContext as the 3176 // lexical context, 3177 while (SearchDC->isRecord()) 3178 SearchDC = SearchDC->getParent(); 3179 3180 // Find the scope where we'll be declaring the tag. 3181 while (S->isClassScope() || 3182 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 3183 ((S->getFlags() & Scope::DeclScope) == 0) || 3184 (S->getEntity() && 3185 ((DeclContext *)S->getEntity())->isTransparentContext())) 3186 S = S->getParent(); 3187 } 3188 3189CreateNewDecl: 3190 3191 // If there is an identifier, use the location of the identifier as the 3192 // location of the decl, otherwise use the location of the struct/union 3193 // keyword. 3194 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 3195 3196 // Otherwise, create a new declaration. If there is a previous 3197 // declaration of the same entity, the two will be linked via 3198 // PrevDecl. 3199 TagDecl *New; 3200 3201 if (Kind == TagDecl::TK_enum) { 3202 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3203 // enum X { A, B, C } D; D should chain to X. 3204 New = EnumDecl::Create(Context, SearchDC, Loc, Name, 3205 cast_or_null<EnumDecl>(PrevDecl)); 3206 // If this is an undefined enum, warn. 3207 if (TK != TK_Definition) Diag(Loc, diag::ext_forward_ref_enum); 3208 } else { 3209 // struct/union/class 3210 3211 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3212 // struct X { int A; } D; D should chain to X. 3213 if (getLangOptions().CPlusPlus) 3214 // FIXME: Look for a way to use RecordDecl for simple structs. 3215 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3216 cast_or_null<CXXRecordDecl>(PrevDecl)); 3217 else 3218 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3219 cast_or_null<RecordDecl>(PrevDecl)); 3220 } 3221 3222 if (Kind != TagDecl::TK_enum) { 3223 // Handle #pragma pack: if the #pragma pack stack has non-default 3224 // alignment, make up a packed attribute for this decl. These 3225 // attributes are checked when the ASTContext lays out the 3226 // structure. 3227 // 3228 // It is important for implementing the correct semantics that this 3229 // happen here (in act on tag decl). The #pragma pack stack is 3230 // maintained as a result of parser callbacks which can occur at 3231 // many points during the parsing of a struct declaration (because 3232 // the #pragma tokens are effectively skipped over during the 3233 // parsing of the struct). 3234 if (unsigned Alignment = PackContext.getAlignment()) 3235 New->addAttr(new PackedAttr(Alignment * 8)); 3236 } 3237 3238 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 3239 // C++ [dcl.typedef]p3: 3240 // [...] Similarly, in a given scope, a class or enumeration 3241 // shall not be declared with the same name as a typedef-name 3242 // that is declared in that scope and refers to a type other 3243 // than the class or enumeration itself. 3244 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 3245 TypedefDecl *PrevTypedef = 0; 3246 if (Lookup.getKind() == LookupResult::Found) 3247 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 3248 3249 if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && 3250 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 3251 Context.getCanonicalType(Context.getTypeDeclType(New))) { 3252 Diag(Loc, diag::err_tag_definition_of_typedef) 3253 << Context.getTypeDeclType(New) 3254 << PrevTypedef->getUnderlyingType(); 3255 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 3256 Invalid = true; 3257 } 3258 } 3259 3260 if (Invalid) 3261 New->setInvalidDecl(); 3262 3263 if (Attr) 3264 ProcessDeclAttributeList(New, Attr); 3265 3266 // If we're declaring or defining a tag in function prototype scope 3267 // in C, note that this type can only be used within the function. 3268 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 3269 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 3270 3271 // Set the lexical context. If the tag has a C++ scope specifier, the 3272 // lexical context will be different from the semantic context. 3273 New->setLexicalDeclContext(CurContext); 3274 3275 if (TK == TK_Definition) 3276 New->startDefinition(); 3277 3278 // If this has an identifier, add it to the scope stack. 3279 if (Name) { 3280 S = getNonFieldDeclScope(S); 3281 PushOnScopeChains(New, S); 3282 } else { 3283 CurContext->addDecl(New); 3284 } 3285 3286 return New; 3287} 3288 3289void Sema::ActOnTagStartDefinition(Scope *S, DeclTy *TagD) { 3290 AdjustDeclIfTemplate(TagD); 3291 TagDecl *Tag = cast<TagDecl>((Decl *)TagD); 3292 3293 // Enter the tag context. 3294 PushDeclContext(S, Tag); 3295 3296 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 3297 FieldCollector->StartClass(); 3298 3299 if (Record->getIdentifier()) { 3300 // C++ [class]p2: 3301 // [...] The class-name is also inserted into the scope of the 3302 // class itself; this is known as the injected-class-name. For 3303 // purposes of access checking, the injected-class-name is treated 3304 // as if it were a public member name. 3305 RecordDecl *InjectedClassName 3306 = CXXRecordDecl::Create(Context, Record->getTagKind(), 3307 CurContext, Record->getLocation(), 3308 Record->getIdentifier(), Record); 3309 InjectedClassName->setImplicit(); 3310 PushOnScopeChains(InjectedClassName, S); 3311 } 3312 } 3313} 3314 3315void Sema::ActOnTagFinishDefinition(Scope *S, DeclTy *TagD) { 3316 AdjustDeclIfTemplate(TagD); 3317 TagDecl *Tag = cast<TagDecl>((Decl *)TagD); 3318 3319 if (isa<CXXRecordDecl>(Tag)) 3320 FieldCollector->FinishClass(); 3321 3322 // Exit this scope of this tag's definition. 3323 PopDeclContext(); 3324 3325 // Notify the consumer that we've defined a tag. 3326 Consumer.HandleTagDeclDefinition(Tag); 3327} 3328 3329/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3330/// types into constant array types in certain situations which would otherwise 3331/// be errors (for GCC compatibility). 3332static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3333 ASTContext &Context) { 3334 // This method tries to turn a variable array into a constant 3335 // array even when the size isn't an ICE. This is necessary 3336 // for compatibility with code that depends on gcc's buggy 3337 // constant expression folding, like struct {char x[(int)(char*)2];} 3338 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3339 if (!VLATy) return QualType(); 3340 3341 Expr::EvalResult EvalResult; 3342 if (!VLATy->getSizeExpr() || 3343 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context)) 3344 return QualType(); 3345 3346 assert(EvalResult.Val.isInt() && "Size expressions must be integers!"); 3347 llvm::APSInt &Res = EvalResult.Val.getInt(); 3348 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) 3349 return Context.getConstantArrayType(VLATy->getElementType(), 3350 Res, ArrayType::Normal, 0); 3351 return QualType(); 3352} 3353 3354bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 3355 QualType FieldTy, const Expr *BitWidth) { 3356 // FIXME: 6.7.2.1p4 - verify the field type. 3357 3358 llvm::APSInt Value; 3359 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 3360 return true; 3361 3362 // Zero-width bitfield is ok for anonymous field. 3363 if (Value == 0 && FieldName) 3364 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 3365 3366 if (Value.isNegative()) 3367 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) << FieldName; 3368 3369 uint64_t TypeSize = Context.getTypeSize(FieldTy); 3370 // FIXME: We won't need the 0 size once we check that the field type is valid. 3371 if (TypeSize && Value.getZExtValue() > TypeSize) 3372 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 3373 << FieldName << (unsigned)TypeSize; 3374 3375 return false; 3376} 3377 3378/// ActOnField - Each field of a struct/union/class is passed into this in order 3379/// to create a FieldDecl object for it. 3380Sema::DeclTy *Sema::ActOnField(Scope *S, DeclTy *TagD, 3381 SourceLocation DeclStart, 3382 Declarator &D, ExprTy *BitfieldWidth) { 3383 IdentifierInfo *II = D.getIdentifier(); 3384 Expr *BitWidth = (Expr*)BitfieldWidth; 3385 SourceLocation Loc = DeclStart; 3386 RecordDecl *Record = (RecordDecl *)TagD; 3387 if (II) Loc = D.getIdentifierLoc(); 3388 3389 // FIXME: Unnamed fields can be handled in various different ways, for 3390 // example, unnamed unions inject all members into the struct namespace! 3391 3392 QualType T = GetTypeForDeclarator(D, S); 3393 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3394 bool InvalidDecl = false; 3395 3396 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3397 // than a variably modified type. 3398 if (T->isVariablyModifiedType()) { 3399 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context); 3400 if (!FixedTy.isNull()) { 3401 Diag(Loc, diag::warn_illegal_constant_array_size); 3402 T = FixedTy; 3403 } else { 3404 Diag(Loc, diag::err_typecheck_field_variable_size); 3405 T = Context.IntTy; 3406 InvalidDecl = true; 3407 } 3408 } 3409 3410 if (BitWidth) { 3411 if (VerifyBitField(Loc, II, T, BitWidth)) 3412 InvalidDecl = true; 3413 } else { 3414 // Not a bitfield. 3415 3416 // validate II. 3417 3418 } 3419 3420 // FIXME: Chain fielddecls together. 3421 FieldDecl *NewFD; 3422 3423 NewFD = FieldDecl::Create(Context, Record, 3424 Loc, II, T, BitWidth, 3425 D.getDeclSpec().getStorageClassSpec() == 3426 DeclSpec::SCS_mutable); 3427 3428 if (II) { 3429 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3430 if (PrevDecl && isDeclInScope(PrevDecl, CurContext, S) 3431 && !isa<TagDecl>(PrevDecl)) { 3432 Diag(Loc, diag::err_duplicate_member) << II; 3433 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3434 NewFD->setInvalidDecl(); 3435 Record->setInvalidDecl(); 3436 } 3437 } 3438 3439 if (getLangOptions().CPlusPlus) { 3440 CheckExtraCXXDefaultArguments(D); 3441 if (!T->isPODType()) 3442 cast<CXXRecordDecl>(Record)->setPOD(false); 3443 } 3444 3445 ProcessDeclAttributes(NewFD, D); 3446 3447 if (D.getInvalidType() || InvalidDecl) 3448 NewFD->setInvalidDecl(); 3449 3450 if (II) { 3451 PushOnScopeChains(NewFD, S); 3452 } else 3453 Record->addDecl(NewFD); 3454 3455 return NewFD; 3456} 3457 3458/// TranslateIvarVisibility - Translate visibility from a token ID to an 3459/// AST enum value. 3460static ObjCIvarDecl::AccessControl 3461TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 3462 switch (ivarVisibility) { 3463 default: assert(0 && "Unknown visitibility kind"); 3464 case tok::objc_private: return ObjCIvarDecl::Private; 3465 case tok::objc_public: return ObjCIvarDecl::Public; 3466 case tok::objc_protected: return ObjCIvarDecl::Protected; 3467 case tok::objc_package: return ObjCIvarDecl::Package; 3468 } 3469} 3470 3471/// ActOnIvar - Each ivar field of an objective-c class is passed into this 3472/// in order to create an IvarDecl object for it. 3473Sema::DeclTy *Sema::ActOnIvar(Scope *S, 3474 SourceLocation DeclStart, 3475 Declarator &D, ExprTy *BitfieldWidth, 3476 tok::ObjCKeywordKind Visibility) { 3477 3478 IdentifierInfo *II = D.getIdentifier(); 3479 Expr *BitWidth = (Expr*)BitfieldWidth; 3480 SourceLocation Loc = DeclStart; 3481 if (II) Loc = D.getIdentifierLoc(); 3482 3483 // FIXME: Unnamed fields can be handled in various different ways, for 3484 // example, unnamed unions inject all members into the struct namespace! 3485 3486 QualType T = GetTypeForDeclarator(D, S); 3487 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3488 bool InvalidDecl = false; 3489 3490 if (BitWidth) { 3491 // TODO: Validate. 3492 //printf("WARNING: BITFIELDS IGNORED!\n"); 3493 3494 // 6.7.2.1p3 3495 // 6.7.2.1p4 3496 3497 } else { 3498 // Not a bitfield. 3499 3500 // validate II. 3501 3502 } 3503 3504 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3505 // than a variably modified type. 3506 if (T->isVariablyModifiedType()) { 3507 Diag(Loc, diag::err_typecheck_ivar_variable_size); 3508 InvalidDecl = true; 3509 } 3510 3511 // Get the visibility (access control) for this ivar. 3512 ObjCIvarDecl::AccessControl ac = 3513 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 3514 : ObjCIvarDecl::None; 3515 3516 // Construct the decl. 3517 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, Loc, II, T, ac, 3518 (Expr *)BitfieldWidth); 3519 3520 if (II) { 3521 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3522 if (PrevDecl && isDeclInScope(PrevDecl, CurContext, S) 3523 && !isa<TagDecl>(PrevDecl)) { 3524 Diag(Loc, diag::err_duplicate_member) << II; 3525 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3526 NewID->setInvalidDecl(); 3527 } 3528 } 3529 3530 // Process attributes attached to the ivar. 3531 ProcessDeclAttributes(NewID, D); 3532 3533 if (D.getInvalidType() || InvalidDecl) 3534 NewID->setInvalidDecl(); 3535 3536 if (II) { 3537 // FIXME: When interfaces are DeclContexts, we'll need to add 3538 // these to the interface. 3539 S->AddDecl(NewID); 3540 IdResolver.AddDecl(NewID); 3541 } 3542 3543 return NewID; 3544} 3545 3546void Sema::ActOnFields(Scope* S, 3547 SourceLocation RecLoc, DeclTy *RecDecl, 3548 DeclTy **Fields, unsigned NumFields, 3549 SourceLocation LBrac, SourceLocation RBrac, 3550 AttributeList *Attr) { 3551 Decl *EnclosingDecl = static_cast<Decl*>(RecDecl); 3552 assert(EnclosingDecl && "missing record or interface decl"); 3553 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 3554 3555 // Verify that all the fields are okay. 3556 unsigned NumNamedMembers = 0; 3557 llvm::SmallVector<FieldDecl*, 32> RecFields; 3558 3559 for (unsigned i = 0; i != NumFields; ++i) { 3560 FieldDecl *FD = cast_or_null<FieldDecl>(static_cast<Decl*>(Fields[i])); 3561 assert(FD && "missing field decl"); 3562 3563 // Get the type for the field. 3564 Type *FDTy = FD->getType().getTypePtr(); 3565 3566 if (!FD->isAnonymousStructOrUnion()) { 3567 // Remember all fields written by the user. 3568 RecFields.push_back(FD); 3569 } 3570 3571 // C99 6.7.2.1p2 - A field may not be a function type. 3572 if (FDTy->isFunctionType()) { 3573 Diag(FD->getLocation(), diag::err_field_declared_as_function) 3574 << FD->getDeclName(); 3575 FD->setInvalidDecl(); 3576 EnclosingDecl->setInvalidDecl(); 3577 continue; 3578 } 3579 // C99 6.7.2.1p2 - A field may not be an incomplete type except... 3580 if (FDTy->isIncompleteType()) { 3581 if (!Record) { // Incomplete ivar type is always an error. 3582 DiagnoseIncompleteType(FD->getLocation(), FD->getType(), 3583 diag::err_field_incomplete); 3584 FD->setInvalidDecl(); 3585 EnclosingDecl->setInvalidDecl(); 3586 continue; 3587 } 3588 if (i != NumFields-1 || // ... that the last member ... 3589 !Record->isStruct() || // ... of a structure ... 3590 !FDTy->isArrayType()) { //... may have incomplete array type. 3591 DiagnoseIncompleteType(FD->getLocation(), FD->getType(), 3592 diag::err_field_incomplete); 3593 FD->setInvalidDecl(); 3594 EnclosingDecl->setInvalidDecl(); 3595 continue; 3596 } 3597 if (NumNamedMembers < 1) { //... must have more than named member ... 3598 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 3599 << FD->getDeclName(); 3600 FD->setInvalidDecl(); 3601 EnclosingDecl->setInvalidDecl(); 3602 continue; 3603 } 3604 // Okay, we have a legal flexible array member at the end of the struct. 3605 if (Record) 3606 Record->setHasFlexibleArrayMember(true); 3607 } 3608 /// C99 6.7.2.1p2 - a struct ending in a flexible array member cannot be the 3609 /// field of another structure or the element of an array. 3610 if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 3611 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 3612 // If this is a member of a union, then entire union becomes "flexible". 3613 if (Record && Record->isUnion()) { 3614 Record->setHasFlexibleArrayMember(true); 3615 } else { 3616 // If this is a struct/class and this is not the last element, reject 3617 // it. Note that GCC supports variable sized arrays in the middle of 3618 // structures. 3619 if (i != NumFields-1) { 3620 Diag(FD->getLocation(), diag::err_variable_sized_type_in_struct) 3621 << FD->getDeclName(); 3622 FD->setInvalidDecl(); 3623 EnclosingDecl->setInvalidDecl(); 3624 continue; 3625 } 3626 // We support flexible arrays at the end of structs in other structs 3627 // as an extension. 3628 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 3629 << FD->getDeclName(); 3630 if (Record) 3631 Record->setHasFlexibleArrayMember(true); 3632 } 3633 } 3634 } 3635 /// A field cannot be an Objective-c object 3636 if (FDTy->isObjCInterfaceType()) { 3637 Diag(FD->getLocation(), diag::err_statically_allocated_object) 3638 << FD->getDeclName(); 3639 FD->setInvalidDecl(); 3640 EnclosingDecl->setInvalidDecl(); 3641 continue; 3642 } 3643 // Keep track of the number of named members. 3644 if (FD->getIdentifier()) 3645 ++NumNamedMembers; 3646 } 3647 3648 // Okay, we successfully defined 'Record'. 3649 if (Record) { 3650 Record->completeDefinition(Context); 3651 } else { 3652 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 3653 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 3654 ID->addInstanceVariablesToClass(ClsFields, RecFields.size(), RBrac); 3655 // Must enforce the rule that ivars in the base classes may not be 3656 // duplicates. 3657 if (ID->getSuperClass()) { 3658 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 3659 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 3660 ObjCIvarDecl* Ivar = (*IVI); 3661 IdentifierInfo *II = Ivar->getIdentifier(); 3662 ObjCIvarDecl* prevIvar = ID->getSuperClass()->FindIvarDeclaration(II); 3663 if (prevIvar) { 3664 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 3665 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 3666 } 3667 } 3668 } 3669 } 3670 else if (ObjCImplementationDecl *IMPDecl = 3671 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 3672 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 3673 IMPDecl->ObjCAddInstanceVariablesToClassImpl(ClsFields, RecFields.size()); 3674 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 3675 } 3676 } 3677 3678 if (Attr) 3679 ProcessDeclAttributeList(Record, Attr); 3680} 3681 3682Sema::DeclTy *Sema::ActOnEnumConstant(Scope *S, DeclTy *theEnumDecl, 3683 DeclTy *lastEnumConst, 3684 SourceLocation IdLoc, IdentifierInfo *Id, 3685 SourceLocation EqualLoc, ExprTy *val) { 3686 EnumDecl *TheEnumDecl = cast<EnumDecl>(static_cast<Decl*>(theEnumDecl)); 3687 EnumConstantDecl *LastEnumConst = 3688 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(lastEnumConst)); 3689 Expr *Val = static_cast<Expr*>(val); 3690 3691 // The scope passed in may not be a decl scope. Zip up the scope tree until 3692 // we find one that is. 3693 S = getNonFieldDeclScope(S); 3694 3695 // Verify that there isn't already something declared with this name in this 3696 // scope. 3697 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 3698 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3699 // Maybe we will complain about the shadowed template parameter. 3700 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 3701 // Just pretend that we didn't see the previous declaration. 3702 PrevDecl = 0; 3703 } 3704 3705 if (PrevDecl) { 3706 // When in C++, we may get a TagDecl with the same name; in this case the 3707 // enum constant will 'hide' the tag. 3708 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 3709 "Received TagDecl when not in C++!"); 3710 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 3711 if (isa<EnumConstantDecl>(PrevDecl)) 3712 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 3713 else 3714 Diag(IdLoc, diag::err_redefinition) << Id; 3715 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3716 Val->Destroy(Context); 3717 return 0; 3718 } 3719 } 3720 3721 llvm::APSInt EnumVal(32); 3722 QualType EltTy; 3723 if (Val) { 3724 // Make sure to promote the operand type to int. 3725 UsualUnaryConversions(Val); 3726 3727 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 3728 SourceLocation ExpLoc; 3729 if (VerifyIntegerConstantExpression(Val, &EnumVal)) { 3730 Val->Destroy(Context); 3731 Val = 0; // Just forget about it. 3732 } else { 3733 EltTy = Val->getType(); 3734 } 3735 } 3736 3737 if (!Val) { 3738 if (LastEnumConst) { 3739 // Assign the last value + 1. 3740 EnumVal = LastEnumConst->getInitVal(); 3741 ++EnumVal; 3742 3743 // Check for overflow on increment. 3744 if (EnumVal < LastEnumConst->getInitVal()) 3745 Diag(IdLoc, diag::warn_enum_value_overflow); 3746 3747 EltTy = LastEnumConst->getType(); 3748 } else { 3749 // First value, set to zero. 3750 EltTy = Context.IntTy; 3751 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 3752 } 3753 } 3754 3755 EnumConstantDecl *New = 3756 EnumConstantDecl::Create(Context, TheEnumDecl, IdLoc, Id, EltTy, 3757 Val, EnumVal); 3758 3759 // Register this decl in the current scope stack. 3760 PushOnScopeChains(New, S); 3761 3762 return New; 3763} 3764 3765// FIXME: For consistency with ActOnFields(), we should have the parser 3766// pass in the source location for the left/right braces. 3767void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclTy *EnumDeclX, 3768 DeclTy **Elements, unsigned NumElements) { 3769 EnumDecl *Enum = cast<EnumDecl>(static_cast<Decl*>(EnumDeclX)); 3770 QualType EnumType = Context.getTypeDeclType(Enum); 3771 3772 // TODO: If the result value doesn't fit in an int, it must be a long or long 3773 // long value. ISO C does not support this, but GCC does as an extension, 3774 // emit a warning. 3775 unsigned IntWidth = Context.Target.getIntWidth(); 3776 3777 // Verify that all the values are okay, compute the size of the values, and 3778 // reverse the list. 3779 unsigned NumNegativeBits = 0; 3780 unsigned NumPositiveBits = 0; 3781 3782 // Keep track of whether all elements have type int. 3783 bool AllElementsInt = true; 3784 3785 for (unsigned i = 0; i != NumElements; ++i) { 3786 EnumConstantDecl *ECD = 3787 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3788 if (!ECD) continue; // Already issued a diagnostic. 3789 3790 // If the enum value doesn't fit in an int, emit an extension warning. 3791 const llvm::APSInt &InitVal = ECD->getInitVal(); 3792 assert(InitVal.getBitWidth() >= IntWidth && 3793 "Should have promoted value to int"); 3794 if (InitVal.getBitWidth() > IntWidth) { 3795 llvm::APSInt V(InitVal); 3796 V.trunc(IntWidth); 3797 V.extend(InitVal.getBitWidth()); 3798 if (V != InitVal) 3799 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 3800 << InitVal.toString(10); 3801 } 3802 3803 // Keep track of the size of positive and negative values. 3804 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 3805 NumPositiveBits = std::max(NumPositiveBits, 3806 (unsigned)InitVal.getActiveBits()); 3807 else 3808 NumNegativeBits = std::max(NumNegativeBits, 3809 (unsigned)InitVal.getMinSignedBits()); 3810 3811 // Keep track of whether every enum element has type int (very commmon). 3812 if (AllElementsInt) 3813 AllElementsInt = ECD->getType() == Context.IntTy; 3814 } 3815 3816 // Figure out the type that should be used for this enum. 3817 // FIXME: Support attribute(packed) on enums and -fshort-enums. 3818 QualType BestType; 3819 unsigned BestWidth; 3820 3821 if (NumNegativeBits) { 3822 // If there is a negative value, figure out the smallest integer type (of 3823 // int/long/longlong) that fits. 3824 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 3825 BestType = Context.IntTy; 3826 BestWidth = IntWidth; 3827 } else { 3828 BestWidth = Context.Target.getLongWidth(); 3829 3830 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 3831 BestType = Context.LongTy; 3832 else { 3833 BestWidth = Context.Target.getLongLongWidth(); 3834 3835 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 3836 Diag(Enum->getLocation(), diag::warn_enum_too_large); 3837 BestType = Context.LongLongTy; 3838 } 3839 } 3840 } else { 3841 // If there is no negative value, figure out which of uint, ulong, ulonglong 3842 // fits. 3843 if (NumPositiveBits <= IntWidth) { 3844 BestType = Context.UnsignedIntTy; 3845 BestWidth = IntWidth; 3846 } else if (NumPositiveBits <= 3847 (BestWidth = Context.Target.getLongWidth())) { 3848 BestType = Context.UnsignedLongTy; 3849 } else { 3850 BestWidth = Context.Target.getLongLongWidth(); 3851 assert(NumPositiveBits <= BestWidth && 3852 "How could an initializer get larger than ULL?"); 3853 BestType = Context.UnsignedLongLongTy; 3854 } 3855 } 3856 3857 // Loop over all of the enumerator constants, changing their types to match 3858 // the type of the enum if needed. 3859 for (unsigned i = 0; i != NumElements; ++i) { 3860 EnumConstantDecl *ECD = 3861 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3862 if (!ECD) continue; // Already issued a diagnostic. 3863 3864 // Standard C says the enumerators have int type, but we allow, as an 3865 // extension, the enumerators to be larger than int size. If each 3866 // enumerator value fits in an int, type it as an int, otherwise type it the 3867 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 3868 // that X has type 'int', not 'unsigned'. 3869 if (ECD->getType() == Context.IntTy) { 3870 // Make sure the init value is signed. 3871 llvm::APSInt IV = ECD->getInitVal(); 3872 IV.setIsSigned(true); 3873 ECD->setInitVal(IV); 3874 3875 if (getLangOptions().CPlusPlus) 3876 // C++ [dcl.enum]p4: Following the closing brace of an 3877 // enum-specifier, each enumerator has the type of its 3878 // enumeration. 3879 ECD->setType(EnumType); 3880 continue; // Already int type. 3881 } 3882 3883 // Determine whether the value fits into an int. 3884 llvm::APSInt InitVal = ECD->getInitVal(); 3885 bool FitsInInt; 3886 if (InitVal.isUnsigned() || !InitVal.isNegative()) 3887 FitsInInt = InitVal.getActiveBits() < IntWidth; 3888 else 3889 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 3890 3891 // If it fits into an integer type, force it. Otherwise force it to match 3892 // the enum decl type. 3893 QualType NewTy; 3894 unsigned NewWidth; 3895 bool NewSign; 3896 if (FitsInInt) { 3897 NewTy = Context.IntTy; 3898 NewWidth = IntWidth; 3899 NewSign = true; 3900 } else if (ECD->getType() == BestType) { 3901 // Already the right type! 3902 if (getLangOptions().CPlusPlus) 3903 // C++ [dcl.enum]p4: Following the closing brace of an 3904 // enum-specifier, each enumerator has the type of its 3905 // enumeration. 3906 ECD->setType(EnumType); 3907 continue; 3908 } else { 3909 NewTy = BestType; 3910 NewWidth = BestWidth; 3911 NewSign = BestType->isSignedIntegerType(); 3912 } 3913 3914 // Adjust the APSInt value. 3915 InitVal.extOrTrunc(NewWidth); 3916 InitVal.setIsSigned(NewSign); 3917 ECD->setInitVal(InitVal); 3918 3919 // Adjust the Expr initializer and type. 3920 if (ECD->getInitExpr()) 3921 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), 3922 /*isLvalue=*/false)); 3923 if (getLangOptions().CPlusPlus) 3924 // C++ [dcl.enum]p4: Following the closing brace of an 3925 // enum-specifier, each enumerator has the type of its 3926 // enumeration. 3927 ECD->setType(EnumType); 3928 else 3929 ECD->setType(NewTy); 3930 } 3931 3932 Enum->completeDefinition(Context, BestType); 3933} 3934 3935Sema::DeclTy *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 3936 ExprArg expr) { 3937 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr.release()); 3938 3939 return FileScopeAsmDecl::Create(Context, CurContext, Loc, AsmString); 3940} 3941 3942 3943void Sema::ActOnPragmaPack(PragmaPackKind Kind, IdentifierInfo *Name, 3944 ExprTy *alignment, SourceLocation PragmaLoc, 3945 SourceLocation LParenLoc, SourceLocation RParenLoc) { 3946 Expr *Alignment = static_cast<Expr *>(alignment); 3947 3948 // If specified then alignment must be a "small" power of two. 3949 unsigned AlignmentVal = 0; 3950 if (Alignment) { 3951 llvm::APSInt Val; 3952 if (!Alignment->isIntegerConstantExpr(Val, Context) || 3953 !Val.isPowerOf2() || 3954 Val.getZExtValue() > 16) { 3955 Diag(PragmaLoc, diag::warn_pragma_pack_invalid_alignment); 3956 Alignment->Destroy(Context); 3957 return; // Ignore 3958 } 3959 3960 AlignmentVal = (unsigned) Val.getZExtValue(); 3961 } 3962 3963 switch (Kind) { 3964 case Action::PPK_Default: // pack([n]) 3965 PackContext.setAlignment(AlignmentVal); 3966 break; 3967 3968 case Action::PPK_Show: // pack(show) 3969 // Show the current alignment, making sure to show the right value 3970 // for the default. 3971 AlignmentVal = PackContext.getAlignment(); 3972 // FIXME: This should come from the target. 3973 if (AlignmentVal == 0) 3974 AlignmentVal = 8; 3975 Diag(PragmaLoc, diag::warn_pragma_pack_show) << AlignmentVal; 3976 break; 3977 3978 case Action::PPK_Push: // pack(push [, id] [, [n]) 3979 PackContext.push(Name); 3980 // Set the new alignment if specified. 3981 if (Alignment) 3982 PackContext.setAlignment(AlignmentVal); 3983 break; 3984 3985 case Action::PPK_Pop: // pack(pop [, id] [, n]) 3986 // MSDN, C/C++ Preprocessor Reference > Pragma Directives > pack: 3987 // "#pragma pack(pop, identifier, n) is undefined" 3988 if (Alignment && Name) 3989 Diag(PragmaLoc, diag::warn_pragma_pack_pop_identifer_and_alignment); 3990 3991 // Do the pop. 3992 if (!PackContext.pop(Name)) { 3993 // If a name was specified then failure indicates the name 3994 // wasn't found. Otherwise failure indicates the stack was 3995 // empty. 3996 Diag(PragmaLoc, diag::warn_pragma_pack_pop_failed) 3997 << (Name ? "no record matching name" : "stack empty"); 3998 3999 // FIXME: Warn about popping named records as MSVC does. 4000 } else { 4001 // Pop succeeded, set the new alignment if specified. 4002 if (Alignment) 4003 PackContext.setAlignment(AlignmentVal); 4004 } 4005 break; 4006 4007 default: 4008 assert(0 && "Invalid #pragma pack kind."); 4009 } 4010} 4011 4012bool PragmaPackStack::pop(IdentifierInfo *Name) { 4013 if (Stack.empty()) 4014 return false; 4015 4016 // If name is empty just pop top. 4017 if (!Name) { 4018 Alignment = Stack.back().first; 4019 Stack.pop_back(); 4020 return true; 4021 } 4022 4023 // Otherwise, find the named record. 4024 for (unsigned i = Stack.size(); i != 0; ) { 4025 --i; 4026 if (Stack[i].second == Name) { 4027 // Found it, pop up to and including this record. 4028 Alignment = Stack[i].first; 4029 Stack.erase(Stack.begin() + i, Stack.end()); 4030 return true; 4031 } 4032 } 4033 4034 return false; 4035} 4036