SemaDecl.cpp revision 450da9832b31d9b2e90af7708d197e5b9e1af8c8
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 // Synthesize a parameter for each argument type. 612 llvm::SmallVector<ParmVarDecl*, 16> Params; 613 for (FunctionTypeProto::arg_type_iterator 614 ParamType = OldProto->arg_type_begin(), 615 ParamEnd = OldProto->arg_type_end(); 616 ParamType != ParamEnd; ++ParamType) { 617 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 618 SourceLocation(), 0, 619 *ParamType, VarDecl::None, 620 0); 621 Param->setImplicit(); 622 Params.push_back(Param); 623 } 624 625 New->setParams(Context, &Params[0], Params.size()); 626 627 } 628 629 MergeAttributes(New, Old); 630 631 return false; 632 } 633 634 // A function that has already been declared has been redeclared or defined 635 // with a different type- show appropriate diagnostic 636 if (unsigned BuiltinID = Old->getBuiltinID(Context)) { 637 // The user has declared a builtin function with an incompatible 638 // signature. 639 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 640 // The function the user is redeclaring is a library-defined 641 // function like 'malloc' or 'printf'. Warn about the 642 // redeclaration, then ignore it. 643 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 644 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 645 << Old << Old->getType(); 646 return false; 647 } 648 649 PrevDiag = diag::note_previous_builtin_declaration; 650 } 651 652 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 653 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 654 return true; 655} 656 657/// Predicate for C "tentative" external object definitions (C99 6.9.2). 658static bool isTentativeDefinition(VarDecl *VD) { 659 if (VD->isFileVarDecl()) 660 return (!VD->getInit() && 661 (VD->getStorageClass() == VarDecl::None || 662 VD->getStorageClass() == VarDecl::Static)); 663 return false; 664} 665 666/// CheckForFileScopedRedefinitions - Make sure we forgo redefinition errors 667/// when dealing with C "tentative" external object definitions (C99 6.9.2). 668void Sema::CheckForFileScopedRedefinitions(Scope *S, VarDecl *VD) { 669 bool VDIsTentative = isTentativeDefinition(VD); 670 bool VDIsIncompleteArray = VD->getType()->isIncompleteArrayType(); 671 672 // FIXME: I don't think this will actually see all of the 673 // redefinitions. Can't we check this property on-the-fly? 674 for (IdentifierResolver::iterator I = IdResolver.begin(VD->getIdentifier()), 675 E = IdResolver.end(); 676 I != E; ++I) { 677 if (*I != VD && isDeclInScope(*I, VD->getDeclContext(), S)) { 678 VarDecl *OldDecl = dyn_cast<VarDecl>(*I); 679 680 // Handle the following case: 681 // int a[10]; 682 // int a[]; - the code below makes sure we set the correct type. 683 // int a[11]; - this is an error, size isn't 10. 684 if (OldDecl && VDIsTentative && VDIsIncompleteArray && 685 OldDecl->getType()->isConstantArrayType()) 686 VD->setType(OldDecl->getType()); 687 688 // Check for "tentative" definitions. We can't accomplish this in 689 // MergeVarDecl since the initializer hasn't been attached. 690 if (!OldDecl || isTentativeDefinition(OldDecl) || VDIsTentative) 691 continue; 692 693 // Handle __private_extern__ just like extern. 694 if (OldDecl->getStorageClass() != VarDecl::Extern && 695 OldDecl->getStorageClass() != VarDecl::PrivateExtern && 696 VD->getStorageClass() != VarDecl::Extern && 697 VD->getStorageClass() != VarDecl::PrivateExtern) { 698 Diag(VD->getLocation(), diag::err_redefinition) << VD->getDeclName(); 699 Diag(OldDecl->getLocation(), diag::note_previous_definition); 700 // One redefinition error is enough. 701 break; 702 } 703 } 704 } 705} 706 707/// MergeVarDecl - We just parsed a variable 'New' which has the same name 708/// and scope as a previous declaration 'Old'. Figure out how to resolve this 709/// situation, merging decls or emitting diagnostics as appropriate. 710/// 711/// Tentative definition rules (C99 6.9.2p2) are checked by 712/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 713/// definitions here, since the initializer hasn't been attached. 714/// 715bool Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 716 // Verify the old decl was also a variable. 717 VarDecl *Old = dyn_cast<VarDecl>(OldD); 718 if (!Old) { 719 Diag(New->getLocation(), diag::err_redefinition_different_kind) 720 << New->getDeclName(); 721 Diag(OldD->getLocation(), diag::note_previous_definition); 722 return true; 723 } 724 725 MergeAttributes(New, Old); 726 727 // Merge the types 728 QualType MergedT = Context.mergeTypes(New->getType(), Old->getType()); 729 if (MergedT.isNull()) { 730 Diag(New->getLocation(), diag::err_redefinition_different_type) 731 << New->getDeclName(); 732 Diag(Old->getLocation(), diag::note_previous_definition); 733 return true; 734 } 735 New->setType(MergedT); 736 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 737 if (New->getStorageClass() == VarDecl::Static && 738 (Old->getStorageClass() == VarDecl::None || 739 Old->getStorageClass() == VarDecl::Extern)) { 740 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 741 Diag(Old->getLocation(), diag::note_previous_definition); 742 return true; 743 } 744 // C99 6.2.2p4: Check if we have a non-static decl followed by a static. 745 if (New->getStorageClass() != VarDecl::Static && 746 Old->getStorageClass() == VarDecl::Static) { 747 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 748 Diag(Old->getLocation(), diag::note_previous_definition); 749 return true; 750 } 751 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 752 if (New->getStorageClass() != VarDecl::Extern && !New->isFileVarDecl()) { 753 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 754 Diag(Old->getLocation(), diag::note_previous_definition); 755 return true; 756 } 757 return false; 758} 759 760/// CheckParmsForFunctionDef - Check that the parameters of the given 761/// function are appropriate for the definition of a function. This 762/// takes care of any checks that cannot be performed on the 763/// declaration itself, e.g., that the types of each of the function 764/// parameters are complete. 765bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 766 bool HasInvalidParm = false; 767 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 768 ParmVarDecl *Param = FD->getParamDecl(p); 769 770 // C99 6.7.5.3p4: the parameters in a parameter type list in a 771 // function declarator that is part of a function definition of 772 // that function shall not have incomplete type. 773 if (!Param->isInvalidDecl() && 774 DiagnoseIncompleteType(Param->getLocation(), Param->getType(), 775 diag::err_typecheck_decl_incomplete_type)) { 776 Param->setInvalidDecl(); 777 HasInvalidParm = true; 778 } 779 780 // C99 6.9.1p5: If the declarator includes a parameter type list, the 781 // declaration of each parameter shall include an identifier. 782 if (Param->getIdentifier() == 0 && 783 !Param->isImplicit() && 784 !getLangOptions().CPlusPlus) 785 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 786 } 787 788 return HasInvalidParm; 789} 790 791/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 792/// no declarator (e.g. "struct foo;") is parsed. 793Sema::DeclTy *Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 794 TagDecl *Tag = 0; 795 if (DS.getTypeSpecType() == DeclSpec::TST_class || 796 DS.getTypeSpecType() == DeclSpec::TST_struct || 797 DS.getTypeSpecType() == DeclSpec::TST_union || 798 DS.getTypeSpecType() == DeclSpec::TST_enum) 799 Tag = dyn_cast<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 800 801 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 802 if (!Record->getDeclName() && Record->isDefinition() && 803 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 804 return BuildAnonymousStructOrUnion(S, DS, Record); 805 806 // Microsoft allows unnamed struct/union fields. Don't complain 807 // about them. 808 // FIXME: Should we support Microsoft's extensions in this area? 809 if (Record->getDeclName() && getLangOptions().Microsoft) 810 return Tag; 811 } 812 813 if (!DS.isMissingDeclaratorOk() && 814 DS.getTypeSpecType() != DeclSpec::TST_error) { 815 // Warn about typedefs of enums without names, since this is an 816 // extension in both Microsoft an GNU. 817 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 818 Tag && isa<EnumDecl>(Tag)) { 819 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 820 << DS.getSourceRange(); 821 return Tag; 822 } 823 824 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 825 << DS.getSourceRange(); 826 return 0; 827 } 828 829 return Tag; 830} 831 832/// InjectAnonymousStructOrUnionMembers - Inject the members of the 833/// anonymous struct or union AnonRecord into the owning context Owner 834/// and scope S. This routine will be invoked just after we realize 835/// that an unnamed union or struct is actually an anonymous union or 836/// struct, e.g., 837/// 838/// @code 839/// union { 840/// int i; 841/// float f; 842/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 843/// // f into the surrounding scope.x 844/// @endcode 845/// 846/// This routine is recursive, injecting the names of nested anonymous 847/// structs/unions into the owning context and scope as well. 848bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 849 RecordDecl *AnonRecord) { 850 bool Invalid = false; 851 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 852 FEnd = AnonRecord->field_end(); 853 F != FEnd; ++F) { 854 if ((*F)->getDeclName()) { 855 NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 856 LookupOrdinaryName, true); 857 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 858 // C++ [class.union]p2: 859 // The names of the members of an anonymous union shall be 860 // distinct from the names of any other entity in the 861 // scope in which the anonymous union is declared. 862 unsigned diagKind 863 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 864 : diag::err_anonymous_struct_member_redecl; 865 Diag((*F)->getLocation(), diagKind) 866 << (*F)->getDeclName(); 867 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 868 Invalid = true; 869 } else { 870 // C++ [class.union]p2: 871 // For the purpose of name lookup, after the anonymous union 872 // definition, the members of the anonymous union are 873 // considered to have been defined in the scope in which the 874 // anonymous union is declared. 875 Owner->makeDeclVisibleInContext(*F); 876 S->AddDecl(*F); 877 IdResolver.AddDecl(*F); 878 } 879 } else if (const RecordType *InnerRecordType 880 = (*F)->getType()->getAsRecordType()) { 881 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 882 if (InnerRecord->isAnonymousStructOrUnion()) 883 Invalid = Invalid || 884 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 885 } 886 } 887 888 return Invalid; 889} 890 891/// ActOnAnonymousStructOrUnion - Handle the declaration of an 892/// anonymous structure or union. Anonymous unions are a C++ feature 893/// (C++ [class.union]) and a GNU C extension; anonymous structures 894/// are a GNU C and GNU C++ extension. 895Sema::DeclTy *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 896 RecordDecl *Record) { 897 DeclContext *Owner = Record->getDeclContext(); 898 899 // Diagnose whether this anonymous struct/union is an extension. 900 if (Record->isUnion() && !getLangOptions().CPlusPlus) 901 Diag(Record->getLocation(), diag::ext_anonymous_union); 902 else if (!Record->isUnion()) 903 Diag(Record->getLocation(), diag::ext_anonymous_struct); 904 905 // C and C++ require different kinds of checks for anonymous 906 // structs/unions. 907 bool Invalid = false; 908 if (getLangOptions().CPlusPlus) { 909 const char* PrevSpec = 0; 910 // C++ [class.union]p3: 911 // Anonymous unions declared in a named namespace or in the 912 // global namespace shall be declared static. 913 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 914 (isa<TranslationUnitDecl>(Owner) || 915 (isa<NamespaceDecl>(Owner) && 916 cast<NamespaceDecl>(Owner)->getDeclName()))) { 917 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 918 Invalid = true; 919 920 // Recover by adding 'static'. 921 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); 922 } 923 // C++ [class.union]p3: 924 // A storage class is not allowed in a declaration of an 925 // anonymous union in a class scope. 926 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 927 isa<RecordDecl>(Owner)) { 928 Diag(DS.getStorageClassSpecLoc(), 929 diag::err_anonymous_union_with_storage_spec); 930 Invalid = true; 931 932 // Recover by removing the storage specifier. 933 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 934 PrevSpec); 935 } 936 937 // C++ [class.union]p2: 938 // The member-specification of an anonymous union shall only 939 // define non-static data members. [Note: nested types and 940 // functions cannot be declared within an anonymous union. ] 941 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 942 MemEnd = Record->decls_end(); 943 Mem != MemEnd; ++Mem) { 944 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 945 // C++ [class.union]p3: 946 // An anonymous union shall not have private or protected 947 // members (clause 11). 948 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 949 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 950 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 951 Invalid = true; 952 } 953 } else if ((*Mem)->isImplicit()) { 954 // Any implicit members are fine. 955 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 956 // This is a type that showed up in an 957 // elaborated-type-specifier inside the anonymous struct or 958 // union, but which actually declares a type outside of the 959 // anonymous struct or union. It's okay. 960 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 961 if (!MemRecord->isAnonymousStructOrUnion() && 962 MemRecord->getDeclName()) { 963 // This is a nested type declaration. 964 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 965 << (int)Record->isUnion(); 966 Invalid = true; 967 } 968 } else { 969 // We have something that isn't a non-static data 970 // member. Complain about it. 971 unsigned DK = diag::err_anonymous_record_bad_member; 972 if (isa<TypeDecl>(*Mem)) 973 DK = diag::err_anonymous_record_with_type; 974 else if (isa<FunctionDecl>(*Mem)) 975 DK = diag::err_anonymous_record_with_function; 976 else if (isa<VarDecl>(*Mem)) 977 DK = diag::err_anonymous_record_with_static; 978 Diag((*Mem)->getLocation(), DK) 979 << (int)Record->isUnion(); 980 Invalid = true; 981 } 982 } 983 } else { 984 // FIXME: Check GNU C semantics 985 if (Record->isUnion() && !Owner->isRecord()) { 986 Diag(Record->getLocation(), diag::err_anonymous_union_not_member) 987 << (int)getLangOptions().CPlusPlus; 988 Invalid = true; 989 } 990 } 991 992 if (!Record->isUnion() && !Owner->isRecord()) { 993 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 994 << (int)getLangOptions().CPlusPlus; 995 Invalid = true; 996 } 997 998 // Create a declaration for this anonymous struct/union. 999 NamedDecl *Anon = 0; 1000 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1001 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1002 /*IdentifierInfo=*/0, 1003 Context.getTypeDeclType(Record), 1004 /*BitWidth=*/0, /*Mutable=*/false); 1005 Anon->setAccess(AS_public); 1006 if (getLangOptions().CPlusPlus) 1007 FieldCollector->Add(cast<FieldDecl>(Anon)); 1008 } else { 1009 VarDecl::StorageClass SC; 1010 switch (DS.getStorageClassSpec()) { 1011 default: assert(0 && "Unknown storage class!"); 1012 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1013 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1014 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1015 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1016 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1017 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1018 case DeclSpec::SCS_mutable: 1019 // mutable can only appear on non-static class members, so it's always 1020 // an error here 1021 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1022 Invalid = true; 1023 SC = VarDecl::None; 1024 break; 1025 } 1026 1027 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1028 /*IdentifierInfo=*/0, 1029 Context.getTypeDeclType(Record), 1030 SC, DS.getSourceRange().getBegin()); 1031 } 1032 Anon->setImplicit(); 1033 1034 // Add the anonymous struct/union object to the current 1035 // context. We'll be referencing this object when we refer to one of 1036 // its members. 1037 Owner->addDecl(Anon); 1038 1039 // Inject the members of the anonymous struct/union into the owning 1040 // context and into the identifier resolver chain for name lookup 1041 // purposes. 1042 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1043 Invalid = true; 1044 1045 // Mark this as an anonymous struct/union type. Note that we do not 1046 // do this until after we have already checked and injected the 1047 // members of this anonymous struct/union type, because otherwise 1048 // the members could be injected twice: once by DeclContext when it 1049 // builds its lookup table, and once by 1050 // InjectAnonymousStructOrUnionMembers. 1051 Record->setAnonymousStructOrUnion(true); 1052 1053 if (Invalid) 1054 Anon->setInvalidDecl(); 1055 1056 return Anon; 1057} 1058 1059bool Sema::CheckSingleInitializer(Expr *&Init, QualType DeclType, 1060 bool DirectInit) { 1061 // Get the type before calling CheckSingleAssignmentConstraints(), since 1062 // it can promote the expression. 1063 QualType InitType = Init->getType(); 1064 1065 if (getLangOptions().CPlusPlus) { 1066 // FIXME: I dislike this error message. A lot. 1067 if (PerformImplicitConversion(Init, DeclType, "initializing", DirectInit)) 1068 return Diag(Init->getSourceRange().getBegin(), 1069 diag::err_typecheck_convert_incompatible) 1070 << DeclType << Init->getType() << "initializing" 1071 << Init->getSourceRange(); 1072 1073 return false; 1074 } 1075 1076 AssignConvertType ConvTy = CheckSingleAssignmentConstraints(DeclType, Init); 1077 return DiagnoseAssignmentResult(ConvTy, Init->getLocStart(), DeclType, 1078 InitType, Init, "initializing"); 1079} 1080 1081bool Sema::CheckStringLiteralInit(StringLiteral *strLiteral, QualType &DeclT) { 1082 const ArrayType *AT = Context.getAsArrayType(DeclT); 1083 1084 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) { 1085 // C99 6.7.8p14. We have an array of character type with unknown size 1086 // being initialized to a string literal. 1087 llvm::APSInt ConstVal(32); 1088 ConstVal = strLiteral->getByteLength() + 1; 1089 // Return a new array type (C99 6.7.8p22). 1090 DeclT = Context.getConstantArrayType(IAT->getElementType(), ConstVal, 1091 ArrayType::Normal, 0); 1092 } else { 1093 const ConstantArrayType *CAT = cast<ConstantArrayType>(AT); 1094 // C99 6.7.8p14. We have an array of character type with known size. 1095 // FIXME: Avoid truncation for 64-bit length strings. 1096 if (strLiteral->getByteLength() > (unsigned)CAT->getSize().getZExtValue()) 1097 Diag(strLiteral->getSourceRange().getBegin(), 1098 diag::warn_initializer_string_for_char_array_too_long) 1099 << strLiteral->getSourceRange(); 1100 } 1101 // Set type from "char *" to "constant array of char". 1102 strLiteral->setType(DeclT); 1103 // For now, we always return false (meaning success). 1104 return false; 1105} 1106 1107StringLiteral *Sema::IsStringLiteralInit(Expr *Init, QualType DeclType) { 1108 const ArrayType *AT = Context.getAsArrayType(DeclType); 1109 if (AT && AT->getElementType()->isCharType()) { 1110 return dyn_cast<StringLiteral>(Init->IgnoreParens()); 1111 } 1112 return 0; 1113} 1114 1115bool Sema::CheckInitializerTypes(Expr *&Init, QualType &DeclType, 1116 SourceLocation InitLoc, 1117 DeclarationName InitEntity, 1118 bool DirectInit) { 1119 if (DeclType->isDependentType() || Init->isTypeDependent()) 1120 return false; 1121 1122 // C++ [dcl.init.ref]p1: 1123 // A variable declared to be a T&, that is "reference to type T" 1124 // (8.3.2), shall be initialized by an object, or function, of 1125 // type T or by an object that can be converted into a T. 1126 if (DeclType->isReferenceType()) 1127 return CheckReferenceInit(Init, DeclType, 0, false, DirectInit); 1128 1129 // C99 6.7.8p3: The type of the entity to be initialized shall be an array 1130 // of unknown size ("[]") or an object type that is not a variable array type. 1131 if (const VariableArrayType *VAT = Context.getAsVariableArrayType(DeclType)) 1132 return Diag(InitLoc, diag::err_variable_object_no_init) 1133 << VAT->getSizeExpr()->getSourceRange(); 1134 1135 InitListExpr *InitList = dyn_cast<InitListExpr>(Init); 1136 if (!InitList) { 1137 // FIXME: Handle wide strings 1138 if (StringLiteral *strLiteral = IsStringLiteralInit(Init, DeclType)) 1139 return CheckStringLiteralInit(strLiteral, DeclType); 1140 1141 // C++ [dcl.init]p14: 1142 // -- If the destination type is a (possibly cv-qualified) class 1143 // type: 1144 if (getLangOptions().CPlusPlus && DeclType->isRecordType()) { 1145 QualType DeclTypeC = Context.getCanonicalType(DeclType); 1146 QualType InitTypeC = Context.getCanonicalType(Init->getType()); 1147 1148 // -- If the initialization is direct-initialization, or if it is 1149 // copy-initialization where the cv-unqualified version of the 1150 // source type is the same class as, or a derived class of, the 1151 // class of the destination, constructors are considered. 1152 if ((DeclTypeC.getUnqualifiedType() == InitTypeC.getUnqualifiedType()) || 1153 IsDerivedFrom(InitTypeC, DeclTypeC)) { 1154 CXXConstructorDecl *Constructor 1155 = PerformInitializationByConstructor(DeclType, &Init, 1, 1156 InitLoc, Init->getSourceRange(), 1157 InitEntity, 1158 DirectInit? IK_Direct : IK_Copy); 1159 return Constructor == 0; 1160 } 1161 1162 // -- Otherwise (i.e., for the remaining copy-initialization 1163 // cases), user-defined conversion sequences that can 1164 // convert from the source type to the destination type or 1165 // (when a conversion function is used) to a derived class 1166 // thereof are enumerated as described in 13.3.1.4, and the 1167 // best one is chosen through overload resolution 1168 // (13.3). If the conversion cannot be done or is 1169 // ambiguous, the initialization is ill-formed. The 1170 // function selected is called with the initializer 1171 // expression as its argument; if the function is a 1172 // constructor, the call initializes a temporary of the 1173 // destination type. 1174 // FIXME: We're pretending to do copy elision here; return to 1175 // this when we have ASTs for such things. 1176 if (!PerformImplicitConversion(Init, DeclType, "initializing")) 1177 return false; 1178 1179 if (InitEntity) 1180 return Diag(InitLoc, diag::err_cannot_initialize_decl) 1181 << InitEntity << (int)(Init->isLvalue(Context) == Expr::LV_Valid) 1182 << Init->getType() << Init->getSourceRange(); 1183 else 1184 return Diag(InitLoc, diag::err_cannot_initialize_decl_noname) 1185 << DeclType << (int)(Init->isLvalue(Context) == Expr::LV_Valid) 1186 << Init->getType() << Init->getSourceRange(); 1187 } 1188 1189 // C99 6.7.8p16. 1190 if (DeclType->isArrayType()) 1191 return Diag(Init->getLocStart(), diag::err_array_init_list_required) 1192 << Init->getSourceRange(); 1193 1194 return CheckSingleInitializer(Init, DeclType, DirectInit); 1195 } 1196 1197 bool hadError = CheckInitList(InitList, DeclType); 1198 Init = InitList; 1199 return hadError; 1200} 1201 1202/// GetNameForDeclarator - Determine the full declaration name for the 1203/// given Declarator. 1204DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1205 switch (D.getKind()) { 1206 case Declarator::DK_Abstract: 1207 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 1208 return DeclarationName(); 1209 1210 case Declarator::DK_Normal: 1211 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 1212 return DeclarationName(D.getIdentifier()); 1213 1214 case Declarator::DK_Constructor: { 1215 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1216 Ty = Context.getCanonicalType(Ty); 1217 return Context.DeclarationNames.getCXXConstructorName(Ty); 1218 } 1219 1220 case Declarator::DK_Destructor: { 1221 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1222 Ty = Context.getCanonicalType(Ty); 1223 return Context.DeclarationNames.getCXXDestructorName(Ty); 1224 } 1225 1226 case Declarator::DK_Conversion: { 1227 // FIXME: We'd like to keep the non-canonical type for diagnostics! 1228 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1229 Ty = Context.getCanonicalType(Ty); 1230 return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 1231 } 1232 1233 case Declarator::DK_Operator: 1234 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 1235 return Context.DeclarationNames.getCXXOperatorName( 1236 D.getOverloadedOperator()); 1237 } 1238 1239 assert(false && "Unknown name kind"); 1240 return DeclarationName(); 1241} 1242 1243/// isNearlyMatchingFunction - Determine whether the C++ functions 1244/// Declaration and Definition are "nearly" matching. This heuristic 1245/// is used to improve diagnostics in the case where an out-of-line 1246/// function definition doesn't match any declaration within 1247/// the class or namespace. 1248static bool isNearlyMatchingFunction(ASTContext &Context, 1249 FunctionDecl *Declaration, 1250 FunctionDecl *Definition) { 1251 if (Declaration->param_size() != Definition->param_size()) 1252 return false; 1253 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1254 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1255 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1256 1257 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1258 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 1259 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1260 return false; 1261 } 1262 1263 return true; 1264} 1265 1266Sema::DeclTy * 1267Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl, 1268 bool IsFunctionDefinition) { 1269 NamedDecl *LastDeclarator = dyn_cast_or_null<NamedDecl>((Decl *)lastDecl); 1270 DeclarationName Name = GetNameForDeclarator(D); 1271 1272 // All of these full declarators require an identifier. If it doesn't have 1273 // one, the ParsedFreeStandingDeclSpec action should be used. 1274 if (!Name) { 1275 if (!D.getInvalidType()) // Reject this if we think it is valid. 1276 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1277 diag::err_declarator_need_ident) 1278 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1279 return 0; 1280 } 1281 1282 // The scope passed in may not be a decl scope. Zip up the scope tree until 1283 // we find one that is. 1284 while ((S->getFlags() & Scope::DeclScope) == 0 || 1285 (S->getFlags() & Scope::TemplateParamScope) != 0) 1286 S = S->getParent(); 1287 1288 DeclContext *DC; 1289 NamedDecl *PrevDecl; 1290 NamedDecl *New; 1291 bool InvalidDecl = false; 1292 1293 // See if this is a redefinition of a variable in the same scope. 1294 if (!D.getCXXScopeSpec().isSet() && !D.getCXXScopeSpec().isInvalid()) { 1295 DC = CurContext; 1296 PrevDecl = LookupName(S, Name, LookupOrdinaryName, true, true, 1297 D.getIdentifierLoc()); 1298 } else { // Something like "int foo::x;" 1299 DC = static_cast<DeclContext*>(D.getCXXScopeSpec().getScopeRep()); 1300 PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName, true); 1301 1302 // C++ 7.3.1.2p2: 1303 // Members (including explicit specializations of templates) of a named 1304 // namespace can also be defined outside that namespace by explicit 1305 // qualification of the name being defined, provided that the entity being 1306 // defined was already declared in the namespace and the definition appears 1307 // after the point of declaration in a namespace that encloses the 1308 // declarations namespace. 1309 // 1310 // Note that we only check the context at this point. We don't yet 1311 // have enough information to make sure that PrevDecl is actually 1312 // the declaration we want to match. For example, given: 1313 // 1314 // class X { 1315 // void f(); 1316 // void f(float); 1317 // }; 1318 // 1319 // void X::f(int) { } // ill-formed 1320 // 1321 // In this case, PrevDecl will point to the overload set 1322 // containing the two f's declared in X, but neither of them 1323 // matches. 1324 1325 // First check whether we named the global scope. 1326 if (isa<TranslationUnitDecl>(DC)) { 1327 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1328 << Name << D.getCXXScopeSpec().getRange(); 1329 } else if (!CurContext->Encloses(DC)) { 1330 // The qualifying scope doesn't enclose the original declaration. 1331 // Emit diagnostic based on current scope. 1332 SourceLocation L = D.getIdentifierLoc(); 1333 SourceRange R = D.getCXXScopeSpec().getRange(); 1334 if (isa<FunctionDecl>(CurContext)) 1335 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1336 else 1337 Diag(L, diag::err_invalid_declarator_scope) 1338 << Name << cast<NamedDecl>(DC) << R; 1339 InvalidDecl = true; 1340 } 1341 } 1342 1343 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1344 // Maybe we will complain about the shadowed template parameter. 1345 InvalidDecl = InvalidDecl 1346 || DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 1347 // Just pretend that we didn't see the previous declaration. 1348 PrevDecl = 0; 1349 } 1350 1351 // In C++, the previous declaration we find might be a tag type 1352 // (class or enum). In this case, the new declaration will hide the 1353 // tag type. Note that this does does not apply if we're declaring a 1354 // typedef (C++ [dcl.typedef]p4). 1355 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 1356 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1357 PrevDecl = 0; 1358 1359 QualType R = GetTypeForDeclarator(D, S); 1360 assert(!R.isNull() && "GetTypeForDeclarator() returned null type"); 1361 1362 bool Redeclaration = false; 1363 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1364 New = ActOnTypedefDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1365 InvalidDecl, Redeclaration); 1366 } else if (R.getTypePtr()->isFunctionType()) { 1367 New = ActOnFunctionDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1368 IsFunctionDefinition, InvalidDecl, 1369 Redeclaration); 1370 } else { 1371 New = ActOnVariableDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1372 InvalidDecl, Redeclaration); 1373 } 1374 1375 if (New == 0) 1376 return 0; 1377 1378 // Set the lexical context. If the declarator has a C++ scope specifier, the 1379 // lexical context will be different from the semantic context. 1380 New->setLexicalDeclContext(CurContext); 1381 1382 // If this has an identifier and is not an invalid redeclaration, 1383 // add it to the scope stack. 1384 if (Name && !(Redeclaration && InvalidDecl)) 1385 PushOnScopeChains(New, S); 1386 // If any semantic error occurred, mark the decl as invalid. 1387 if (D.getInvalidType() || InvalidDecl) 1388 New->setInvalidDecl(); 1389 1390 return New; 1391} 1392 1393NamedDecl* 1394Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1395 QualType R, Decl* LastDeclarator, 1396 Decl* PrevDecl, bool& InvalidDecl, 1397 bool &Redeclaration) { 1398 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1399 if (D.getCXXScopeSpec().isSet()) { 1400 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1401 << D.getCXXScopeSpec().getRange(); 1402 InvalidDecl = true; 1403 // Pretend we didn't see the scope specifier. 1404 DC = 0; 1405 } 1406 1407 // Check that there are no default arguments (C++ only). 1408 if (getLangOptions().CPlusPlus) 1409 CheckExtraCXXDefaultArguments(D); 1410 1411 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, LastDeclarator); 1412 if (!NewTD) return 0; 1413 1414 // Handle attributes prior to checking for duplicates in MergeVarDecl 1415 ProcessDeclAttributes(NewTD, D); 1416 // Merge the decl with the existing one if appropriate. If the decl is 1417 // in an outer scope, it isn't the same thing. 1418 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1419 Redeclaration = true; 1420 if (MergeTypeDefDecl(NewTD, PrevDecl)) 1421 InvalidDecl = true; 1422 } 1423 1424 if (S->getFnParent() == 0) { 1425 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1426 // then it shall have block scope. 1427 if (NewTD->getUnderlyingType()->isVariablyModifiedType()) { 1428 if (NewTD->getUnderlyingType()->isVariableArrayType()) 1429 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1430 else 1431 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1432 1433 InvalidDecl = true; 1434 } 1435 } 1436 return NewTD; 1437} 1438 1439NamedDecl* 1440Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1441 QualType R, Decl* LastDeclarator, 1442 Decl* PrevDecl, bool& InvalidDecl, 1443 bool &Redeclaration) { 1444 DeclarationName Name = GetNameForDeclarator(D); 1445 1446 // Check that there are no default arguments (C++ only). 1447 if (getLangOptions().CPlusPlus) 1448 CheckExtraCXXDefaultArguments(D); 1449 1450 if (R.getTypePtr()->isObjCInterfaceType()) { 1451 Diag(D.getIdentifierLoc(), diag::err_statically_allocated_object) 1452 << D.getIdentifier(); 1453 InvalidDecl = true; 1454 } 1455 1456 VarDecl *NewVD; 1457 VarDecl::StorageClass SC; 1458 switch (D.getDeclSpec().getStorageClassSpec()) { 1459 default: assert(0 && "Unknown storage class!"); 1460 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1461 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1462 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1463 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1464 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1465 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1466 case DeclSpec::SCS_mutable: 1467 // mutable can only appear on non-static class members, so it's always 1468 // an error here 1469 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1470 InvalidDecl = true; 1471 SC = VarDecl::None; 1472 break; 1473 } 1474 1475 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1476 if (!II) { 1477 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1478 << Name.getAsString(); 1479 return 0; 1480 } 1481 1482 if (DC->isRecord()) { 1483 // This is a static data member for a C++ class. 1484 NewVD = CXXClassVarDecl::Create(Context, cast<CXXRecordDecl>(DC), 1485 D.getIdentifierLoc(), II, 1486 R); 1487 } else { 1488 bool ThreadSpecified = D.getDeclSpec().isThreadSpecified(); 1489 if (S->getFnParent() == 0) { 1490 // C99 6.9p2: The storage-class specifiers auto and register shall not 1491 // appear in the declaration specifiers in an external declaration. 1492 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 1493 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 1494 InvalidDecl = true; 1495 } 1496 } 1497 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1498 II, R, SC, 1499 // FIXME: Move to DeclGroup... 1500 D.getDeclSpec().getSourceRange().getBegin()); 1501 NewVD->setThreadSpecified(ThreadSpecified); 1502 } 1503 NewVD->setNextDeclarator(LastDeclarator); 1504 1505 // Handle attributes prior to checking for duplicates in MergeVarDecl 1506 ProcessDeclAttributes(NewVD, D); 1507 1508 // Handle GNU asm-label extension (encoded as an attribute). 1509 if (Expr *E = (Expr*) D.getAsmLabel()) { 1510 // The parser guarantees this is a string. 1511 StringLiteral *SE = cast<StringLiteral>(E); 1512 NewVD->addAttr(new AsmLabelAttr(std::string(SE->getStrData(), 1513 SE->getByteLength()))); 1514 } 1515 1516 // Emit an error if an address space was applied to decl with local storage. 1517 // This includes arrays of objects with address space qualifiers, but not 1518 // automatic variables that point to other address spaces. 1519 // ISO/IEC TR 18037 S5.1.2 1520 if (NewVD->hasLocalStorage() && (NewVD->getType().getAddressSpace() != 0)) { 1521 Diag(D.getIdentifierLoc(), diag::err_as_qualified_auto_decl); 1522 InvalidDecl = true; 1523 } 1524 // Merge the decl with the existing one if appropriate. If the decl is 1525 // in an outer scope, it isn't the same thing. 1526 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1527 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 1528 // The user tried to define a non-static data member 1529 // out-of-line (C++ [dcl.meaning]p1). 1530 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 1531 << D.getCXXScopeSpec().getRange(); 1532 NewVD->Destroy(Context); 1533 return 0; 1534 } 1535 1536 Redeclaration = true; 1537 if (MergeVarDecl(NewVD, PrevDecl)) 1538 InvalidDecl = true; 1539 1540 if (D.getCXXScopeSpec().isSet()) { 1541 // No previous declaration in the qualifying scope. 1542 Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 1543 << Name << D.getCXXScopeSpec().getRange(); 1544 InvalidDecl = true; 1545 } 1546 } 1547 return NewVD; 1548} 1549 1550NamedDecl* 1551Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1552 QualType R, Decl *LastDeclarator, 1553 Decl* PrevDecl, bool IsFunctionDefinition, 1554 bool& InvalidDecl, bool &Redeclaration) { 1555 assert(R.getTypePtr()->isFunctionType()); 1556 1557 DeclarationName Name = GetNameForDeclarator(D); 1558 FunctionDecl::StorageClass SC = FunctionDecl::None; 1559 switch (D.getDeclSpec().getStorageClassSpec()) { 1560 default: assert(0 && "Unknown storage class!"); 1561 case DeclSpec::SCS_auto: 1562 case DeclSpec::SCS_register: 1563 case DeclSpec::SCS_mutable: 1564 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_func); 1565 InvalidDecl = true; 1566 break; 1567 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 1568 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 1569 case DeclSpec::SCS_static: SC = FunctionDecl::Static; break; 1570 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 1571 } 1572 1573 bool isInline = D.getDeclSpec().isInlineSpecified(); 1574 // bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1575 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 1576 1577 FunctionDecl *NewFD; 1578 if (D.getKind() == Declarator::DK_Constructor) { 1579 // This is a C++ constructor declaration. 1580 assert(DC->isRecord() && 1581 "Constructors can only be declared in a member context"); 1582 1583 InvalidDecl = InvalidDecl || CheckConstructorDeclarator(D, R, SC); 1584 1585 // Create the new declaration 1586 NewFD = CXXConstructorDecl::Create(Context, 1587 cast<CXXRecordDecl>(DC), 1588 D.getIdentifierLoc(), Name, R, 1589 isExplicit, isInline, 1590 /*isImplicitlyDeclared=*/false); 1591 1592 if (InvalidDecl) 1593 NewFD->setInvalidDecl(); 1594 } else if (D.getKind() == Declarator::DK_Destructor) { 1595 // This is a C++ destructor declaration. 1596 if (DC->isRecord()) { 1597 InvalidDecl = InvalidDecl || CheckDestructorDeclarator(D, R, SC); 1598 1599 NewFD = CXXDestructorDecl::Create(Context, 1600 cast<CXXRecordDecl>(DC), 1601 D.getIdentifierLoc(), Name, R, 1602 isInline, 1603 /*isImplicitlyDeclared=*/false); 1604 1605 if (InvalidDecl) 1606 NewFD->setInvalidDecl(); 1607 } else { 1608 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 1609 1610 // Create a FunctionDecl to satisfy the function definition parsing 1611 // code path. 1612 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 1613 Name, R, SC, isInline, 1614 // FIXME: Move to DeclGroup... 1615 D.getDeclSpec().getSourceRange().getBegin()); 1616 InvalidDecl = true; 1617 NewFD->setInvalidDecl(); 1618 } 1619 } else if (D.getKind() == Declarator::DK_Conversion) { 1620 if (!DC->isRecord()) { 1621 Diag(D.getIdentifierLoc(), 1622 diag::err_conv_function_not_member); 1623 return 0; 1624 } else { 1625 InvalidDecl = InvalidDecl || CheckConversionDeclarator(D, R, SC); 1626 1627 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 1628 D.getIdentifierLoc(), Name, R, 1629 isInline, isExplicit); 1630 1631 if (InvalidDecl) 1632 NewFD->setInvalidDecl(); 1633 } 1634 } else if (DC->isRecord()) { 1635 // This is a C++ method declaration. 1636 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 1637 D.getIdentifierLoc(), Name, R, 1638 (SC == FunctionDecl::Static), isInline); 1639 } else { 1640 NewFD = FunctionDecl::Create(Context, DC, 1641 D.getIdentifierLoc(), 1642 Name, R, SC, isInline, 1643 // FIXME: Move to DeclGroup... 1644 D.getDeclSpec().getSourceRange().getBegin()); 1645 } 1646 NewFD->setNextDeclarator(LastDeclarator); 1647 1648 // Set the lexical context. If the declarator has a C++ 1649 // scope specifier, the lexical context will be different 1650 // from the semantic context. 1651 NewFD->setLexicalDeclContext(CurContext); 1652 1653 // Handle GNU asm-label extension (encoded as an attribute). 1654 if (Expr *E = (Expr*) D.getAsmLabel()) { 1655 // The parser guarantees this is a string. 1656 StringLiteral *SE = cast<StringLiteral>(E); 1657 NewFD->addAttr(new AsmLabelAttr(std::string(SE->getStrData(), 1658 SE->getByteLength()))); 1659 } 1660 1661 // Copy the parameter declarations from the declarator D to 1662 // the function declaration NewFD, if they are available. 1663 if (D.getNumTypeObjects() > 0) { 1664 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1665 1666 // Create Decl objects for each parameter, adding them to the 1667 // FunctionDecl. 1668 llvm::SmallVector<ParmVarDecl*, 16> Params; 1669 1670 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 1671 // function that takes no arguments, not a function that takes a 1672 // single void argument. 1673 // We let through "const void" here because Sema::GetTypeForDeclarator 1674 // already checks for that case. 1675 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1676 FTI.ArgInfo[0].Param && 1677 ((ParmVarDecl*)FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 1678 // empty arg list, don't push any params. 1679 ParmVarDecl *Param = (ParmVarDecl*)FTI.ArgInfo[0].Param; 1680 1681 // In C++, the empty parameter-type-list must be spelled "void"; a 1682 // typedef of void is not permitted. 1683 if (getLangOptions().CPlusPlus && 1684 Param->getType().getUnqualifiedType() != Context.VoidTy) { 1685 Diag(Param->getLocation(), diag::ext_param_typedef_of_void); 1686 } 1687 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 1688 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 1689 Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 1690 } 1691 1692 NewFD->setParams(Context, &Params[0], Params.size()); 1693 } else if (R->getAsTypedefType()) { 1694 // When we're declaring a function with a typedef, as in the 1695 // following example, we'll need to synthesize (unnamed) 1696 // parameters for use in the declaration. 1697 // 1698 // @code 1699 // typedef void fn(int); 1700 // fn f; 1701 // @endcode 1702 const FunctionTypeProto *FT = R->getAsFunctionTypeProto(); 1703 if (!FT) { 1704 // This is a typedef of a function with no prototype, so we 1705 // don't need to do anything. 1706 } else if ((FT->getNumArgs() == 0) || 1707 (FT->getNumArgs() == 1 && !FT->isVariadic() && 1708 FT->getArgType(0)->isVoidType())) { 1709 // This is a zero-argument function. We don't need to do anything. 1710 } else { 1711 // Synthesize a parameter for each argument type. 1712 llvm::SmallVector<ParmVarDecl*, 16> Params; 1713 for (FunctionTypeProto::arg_type_iterator ArgType = FT->arg_type_begin(); 1714 ArgType != FT->arg_type_end(); ++ArgType) { 1715 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, 1716 SourceLocation(), 0, 1717 *ArgType, VarDecl::None, 1718 0); 1719 Param->setImplicit(); 1720 Params.push_back(Param); 1721 } 1722 1723 NewFD->setParams(Context, &Params[0], Params.size()); 1724 } 1725 } 1726 1727 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) 1728 InvalidDecl = InvalidDecl || CheckConstructor(Constructor); 1729 else if (isa<CXXDestructorDecl>(NewFD)) { 1730 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 1731 Record->setUserDeclaredDestructor(true); 1732 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 1733 // user-defined destructor. 1734 Record->setPOD(false); 1735 } else if (CXXConversionDecl *Conversion = 1736 dyn_cast<CXXConversionDecl>(NewFD)) 1737 ActOnConversionDeclarator(Conversion); 1738 1739 // Extra checking for C++ overloaded operators (C++ [over.oper]). 1740 if (NewFD->isOverloadedOperator() && 1741 CheckOverloadedOperatorDeclaration(NewFD)) 1742 NewFD->setInvalidDecl(); 1743 1744 // Merge the decl with the existing one if appropriate. Since C functions 1745 // are in a flat namespace, make sure we consider decls in outer scopes. 1746 bool OverloadableAttrRequired = false; 1747 if (PrevDecl && 1748 (!getLangOptions().CPlusPlus||isDeclInScope(PrevDecl, DC, S))) { 1749 // Determine whether NewFD is an overload of PrevDecl or 1750 // a declaration that requires merging. If it's an overload, 1751 // there's no more work to do here; we'll just add the new 1752 // function to the scope. 1753 OverloadedFunctionDecl::function_iterator MatchedDecl; 1754 1755 if (!getLangOptions().CPlusPlus && 1756 AllowOverloadingOfFunction(PrevDecl, Context)) 1757 OverloadableAttrRequired = true; 1758 1759 if (!AllowOverloadingOfFunction(PrevDecl, Context) || 1760 !IsOverload(NewFD, PrevDecl, MatchedDecl)) { 1761 Redeclaration = true; 1762 Decl *OldDecl = PrevDecl; 1763 1764 // If PrevDecl was an overloaded function, extract the 1765 // FunctionDecl that matched. 1766 if (isa<OverloadedFunctionDecl>(PrevDecl)) 1767 OldDecl = *MatchedDecl; 1768 1769 // NewFD and PrevDecl represent declarations that need to be 1770 // merged. 1771 if (MergeFunctionDecl(NewFD, OldDecl)) 1772 InvalidDecl = true; 1773 1774 if (!InvalidDecl) { 1775 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 1776 1777 // An out-of-line member function declaration must also be a 1778 // definition (C++ [dcl.meaning]p1). 1779 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 1780 !InvalidDecl) { 1781 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 1782 << D.getCXXScopeSpec().getRange(); 1783 NewFD->setInvalidDecl(); 1784 } 1785 } 1786 } 1787 } 1788 1789 if (D.getCXXScopeSpec().isSet() && 1790 (!PrevDecl || !Redeclaration)) { 1791 // The user tried to provide an out-of-line definition for a 1792 // function that is a member of a class or namespace, but there 1793 // was no such member function declared (C++ [class.mfct]p2, 1794 // C++ [namespace.memdef]p2). For example: 1795 // 1796 // class X { 1797 // void f() const; 1798 // }; 1799 // 1800 // void X::f() { } // ill-formed 1801 // 1802 // Complain about this problem, and attempt to suggest close 1803 // matches (e.g., those that differ only in cv-qualifiers and 1804 // whether the parameter types are references). 1805 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 1806 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 1807 InvalidDecl = true; 1808 1809 LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 1810 true); 1811 assert(!Prev.isAmbiguous() && 1812 "Cannot have an ambiguity in previous-declaration lookup"); 1813 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 1814 Func != FuncEnd; ++Func) { 1815 if (isa<FunctionDecl>(*Func) && 1816 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 1817 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 1818 } 1819 1820 PrevDecl = 0; 1821 } 1822 1823 // Handle attributes. We need to have merged decls when handling attributes 1824 // (for example to check for conflicts, etc). 1825 ProcessDeclAttributes(NewFD, D); 1826 AddKnownFunctionAttributes(NewFD); 1827 1828 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 1829 // If a function name is overloadable in C, then every function 1830 // with that name must be marked "overloadable". 1831 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 1832 << Redeclaration << NewFD; 1833 if (PrevDecl) 1834 Diag(PrevDecl->getLocation(), 1835 diag::note_attribute_overloadable_prev_overload); 1836 NewFD->addAttr(new OverloadableAttr); 1837 } 1838 1839 if (getLangOptions().CPlusPlus) { 1840 // In C++, check default arguments now that we have merged decls. Unless 1841 // the lexical context is the class, because in this case this is done 1842 // during delayed parsing anyway. 1843 if (!CurContext->isRecord()) 1844 CheckCXXDefaultArguments(NewFD); 1845 1846 // An out-of-line member function declaration must also be a 1847 // definition (C++ [dcl.meaning]p1). 1848 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && !InvalidDecl) { 1849 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 1850 << D.getCXXScopeSpec().getRange(); 1851 InvalidDecl = true; 1852 } 1853 } 1854 return NewFD; 1855} 1856 1857void Sema::InitializerElementNotConstant(const Expr *Init) { 1858 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 1859 << Init->getSourceRange(); 1860} 1861 1862bool Sema::CheckAddressConstantExpressionLValue(const Expr* Init) { 1863 switch (Init->getStmtClass()) { 1864 default: 1865 InitializerElementNotConstant(Init); 1866 return true; 1867 case Expr::ParenExprClass: { 1868 const ParenExpr* PE = cast<ParenExpr>(Init); 1869 return CheckAddressConstantExpressionLValue(PE->getSubExpr()); 1870 } 1871 case Expr::CompoundLiteralExprClass: 1872 return cast<CompoundLiteralExpr>(Init)->isFileScope(); 1873 case Expr::DeclRefExprClass: 1874 case Expr::QualifiedDeclRefExprClass: { 1875 const Decl *D = cast<DeclRefExpr>(Init)->getDecl(); 1876 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1877 if (VD->hasGlobalStorage()) 1878 return false; 1879 InitializerElementNotConstant(Init); 1880 return true; 1881 } 1882 if (isa<FunctionDecl>(D)) 1883 return false; 1884 InitializerElementNotConstant(Init); 1885 return true; 1886 } 1887 case Expr::MemberExprClass: { 1888 const MemberExpr *M = cast<MemberExpr>(Init); 1889 if (M->isArrow()) 1890 return CheckAddressConstantExpression(M->getBase()); 1891 return CheckAddressConstantExpressionLValue(M->getBase()); 1892 } 1893 case Expr::ArraySubscriptExprClass: { 1894 // FIXME: Should we pedwarn for "x[0+0]" (where x is a pointer)? 1895 const ArraySubscriptExpr *ASE = cast<ArraySubscriptExpr>(Init); 1896 return CheckAddressConstantExpression(ASE->getBase()) || 1897 CheckArithmeticConstantExpression(ASE->getIdx()); 1898 } 1899 case Expr::StringLiteralClass: 1900 case Expr::PredefinedExprClass: 1901 return false; 1902 case Expr::UnaryOperatorClass: { 1903 const UnaryOperator *Exp = cast<UnaryOperator>(Init); 1904 1905 // C99 6.6p9 1906 if (Exp->getOpcode() == UnaryOperator::Deref) 1907 return CheckAddressConstantExpression(Exp->getSubExpr()); 1908 1909 InitializerElementNotConstant(Init); 1910 return true; 1911 } 1912 } 1913} 1914 1915bool Sema::CheckAddressConstantExpression(const Expr* Init) { 1916 switch (Init->getStmtClass()) { 1917 default: 1918 InitializerElementNotConstant(Init); 1919 return true; 1920 case Expr::ParenExprClass: 1921 return CheckAddressConstantExpression(cast<ParenExpr>(Init)->getSubExpr()); 1922 case Expr::StringLiteralClass: 1923 case Expr::ObjCStringLiteralClass: 1924 return false; 1925 case Expr::CallExprClass: 1926 case Expr::CXXOperatorCallExprClass: 1927 // __builtin___CFStringMakeConstantString is a valid constant l-value. 1928 if (cast<CallExpr>(Init)->isBuiltinCall(Context) == 1929 Builtin::BI__builtin___CFStringMakeConstantString) 1930 return false; 1931 1932 InitializerElementNotConstant(Init); 1933 return true; 1934 1935 case Expr::UnaryOperatorClass: { 1936 const UnaryOperator *Exp = cast<UnaryOperator>(Init); 1937 1938 // C99 6.6p9 1939 if (Exp->getOpcode() == UnaryOperator::AddrOf) 1940 return CheckAddressConstantExpressionLValue(Exp->getSubExpr()); 1941 1942 if (Exp->getOpcode() == UnaryOperator::Extension) 1943 return CheckAddressConstantExpression(Exp->getSubExpr()); 1944 1945 InitializerElementNotConstant(Init); 1946 return true; 1947 } 1948 case Expr::BinaryOperatorClass: { 1949 // FIXME: Should we pedwarn for expressions like "a + 1 + 2"? 1950 const BinaryOperator *Exp = cast<BinaryOperator>(Init); 1951 1952 Expr *PExp = Exp->getLHS(); 1953 Expr *IExp = Exp->getRHS(); 1954 if (IExp->getType()->isPointerType()) 1955 std::swap(PExp, IExp); 1956 1957 // FIXME: Should we pedwarn if IExp isn't an integer constant expression? 1958 return CheckAddressConstantExpression(PExp) || 1959 CheckArithmeticConstantExpression(IExp); 1960 } 1961 case Expr::ImplicitCastExprClass: 1962 case Expr::CStyleCastExprClass: { 1963 const Expr* SubExpr = cast<CastExpr>(Init)->getSubExpr(); 1964 if (Init->getStmtClass() == Expr::ImplicitCastExprClass) { 1965 // Check for implicit promotion 1966 if (SubExpr->getType()->isFunctionType() || 1967 SubExpr->getType()->isArrayType()) 1968 return CheckAddressConstantExpressionLValue(SubExpr); 1969 } 1970 1971 // Check for pointer->pointer cast 1972 if (SubExpr->getType()->isPointerType()) 1973 return CheckAddressConstantExpression(SubExpr); 1974 1975 if (SubExpr->getType()->isIntegralType()) { 1976 // Check for the special-case of a pointer->int->pointer cast; 1977 // this isn't standard, but some code requires it. See 1978 // PR2720 for an example. 1979 if (const CastExpr* SubCast = dyn_cast<CastExpr>(SubExpr)) { 1980 if (SubCast->getSubExpr()->getType()->isPointerType()) { 1981 unsigned IntWidth = Context.getIntWidth(SubCast->getType()); 1982 unsigned PointerWidth = Context.getTypeSize(Context.VoidPtrTy); 1983 if (IntWidth >= PointerWidth) { 1984 return CheckAddressConstantExpression(SubCast->getSubExpr()); 1985 } 1986 } 1987 } 1988 } 1989 if (SubExpr->getType()->isArithmeticType()) { 1990 return CheckArithmeticConstantExpression(SubExpr); 1991 } 1992 1993 InitializerElementNotConstant(Init); 1994 return true; 1995 } 1996 case Expr::ConditionalOperatorClass: { 1997 // FIXME: Should we pedwarn here? 1998 const ConditionalOperator *Exp = cast<ConditionalOperator>(Init); 1999 if (!Exp->getCond()->getType()->isArithmeticType()) { 2000 InitializerElementNotConstant(Init); 2001 return true; 2002 } 2003 if (CheckArithmeticConstantExpression(Exp->getCond())) 2004 return true; 2005 if (Exp->getLHS() && 2006 CheckAddressConstantExpression(Exp->getLHS())) 2007 return true; 2008 return CheckAddressConstantExpression(Exp->getRHS()); 2009 } 2010 case Expr::AddrLabelExprClass: 2011 return false; 2012 } 2013} 2014 2015static const Expr* FindExpressionBaseAddress(const Expr* E); 2016 2017static const Expr* FindExpressionBaseAddressLValue(const Expr* E) { 2018 switch (E->getStmtClass()) { 2019 default: 2020 return E; 2021 case Expr::ParenExprClass: { 2022 const ParenExpr* PE = cast<ParenExpr>(E); 2023 return FindExpressionBaseAddressLValue(PE->getSubExpr()); 2024 } 2025 case Expr::MemberExprClass: { 2026 const MemberExpr *M = cast<MemberExpr>(E); 2027 if (M->isArrow()) 2028 return FindExpressionBaseAddress(M->getBase()); 2029 return FindExpressionBaseAddressLValue(M->getBase()); 2030 } 2031 case Expr::ArraySubscriptExprClass: { 2032 const ArraySubscriptExpr *ASE = cast<ArraySubscriptExpr>(E); 2033 return FindExpressionBaseAddress(ASE->getBase()); 2034 } 2035 case Expr::UnaryOperatorClass: { 2036 const UnaryOperator *Exp = cast<UnaryOperator>(E); 2037 2038 if (Exp->getOpcode() == UnaryOperator::Deref) 2039 return FindExpressionBaseAddress(Exp->getSubExpr()); 2040 2041 return E; 2042 } 2043 } 2044} 2045 2046static const Expr* FindExpressionBaseAddress(const Expr* E) { 2047 switch (E->getStmtClass()) { 2048 default: 2049 return E; 2050 case Expr::ParenExprClass: { 2051 const ParenExpr* PE = cast<ParenExpr>(E); 2052 return FindExpressionBaseAddress(PE->getSubExpr()); 2053 } 2054 case Expr::UnaryOperatorClass: { 2055 const UnaryOperator *Exp = cast<UnaryOperator>(E); 2056 2057 // C99 6.6p9 2058 if (Exp->getOpcode() == UnaryOperator::AddrOf) 2059 return FindExpressionBaseAddressLValue(Exp->getSubExpr()); 2060 2061 if (Exp->getOpcode() == UnaryOperator::Extension) 2062 return FindExpressionBaseAddress(Exp->getSubExpr()); 2063 2064 return E; 2065 } 2066 case Expr::BinaryOperatorClass: { 2067 const BinaryOperator *Exp = cast<BinaryOperator>(E); 2068 2069 Expr *PExp = Exp->getLHS(); 2070 Expr *IExp = Exp->getRHS(); 2071 if (IExp->getType()->isPointerType()) 2072 std::swap(PExp, IExp); 2073 2074 return FindExpressionBaseAddress(PExp); 2075 } 2076 case Expr::ImplicitCastExprClass: { 2077 const Expr* SubExpr = cast<ImplicitCastExpr>(E)->getSubExpr(); 2078 2079 // Check for implicit promotion 2080 if (SubExpr->getType()->isFunctionType() || 2081 SubExpr->getType()->isArrayType()) 2082 return FindExpressionBaseAddressLValue(SubExpr); 2083 2084 // Check for pointer->pointer cast 2085 if (SubExpr->getType()->isPointerType()) 2086 return FindExpressionBaseAddress(SubExpr); 2087 2088 // We assume that we have an arithmetic expression here; 2089 // if we don't, we'll figure it out later 2090 return 0; 2091 } 2092 case Expr::CStyleCastExprClass: { 2093 const Expr* SubExpr = cast<CastExpr>(E)->getSubExpr(); 2094 2095 // Check for pointer->pointer cast 2096 if (SubExpr->getType()->isPointerType()) 2097 return FindExpressionBaseAddress(SubExpr); 2098 2099 // We assume that we have an arithmetic expression here; 2100 // if we don't, we'll figure it out later 2101 return 0; 2102 } 2103 } 2104} 2105 2106bool Sema::CheckArithmeticConstantExpression(const Expr* Init) { 2107 switch (Init->getStmtClass()) { 2108 default: 2109 InitializerElementNotConstant(Init); 2110 return true; 2111 case Expr::ParenExprClass: { 2112 const ParenExpr* PE = cast<ParenExpr>(Init); 2113 return CheckArithmeticConstantExpression(PE->getSubExpr()); 2114 } 2115 case Expr::FloatingLiteralClass: 2116 case Expr::IntegerLiteralClass: 2117 case Expr::CharacterLiteralClass: 2118 case Expr::ImaginaryLiteralClass: 2119 case Expr::TypesCompatibleExprClass: 2120 case Expr::CXXBoolLiteralExprClass: 2121 return false; 2122 case Expr::CallExprClass: 2123 case Expr::CXXOperatorCallExprClass: { 2124 const CallExpr *CE = cast<CallExpr>(Init); 2125 2126 // Allow any constant foldable calls to builtins. 2127 if (CE->isBuiltinCall(Context) && CE->isEvaluatable(Context)) 2128 return false; 2129 2130 InitializerElementNotConstant(Init); 2131 return true; 2132 } 2133 case Expr::DeclRefExprClass: 2134 case Expr::QualifiedDeclRefExprClass: { 2135 const Decl *D = cast<DeclRefExpr>(Init)->getDecl(); 2136 if (isa<EnumConstantDecl>(D)) 2137 return false; 2138 InitializerElementNotConstant(Init); 2139 return true; 2140 } 2141 case Expr::CompoundLiteralExprClass: 2142 // Allow "(vector type){2,4}"; normal C constraints don't allow this, 2143 // but vectors are allowed to be magic. 2144 if (Init->getType()->isVectorType()) 2145 return false; 2146 InitializerElementNotConstant(Init); 2147 return true; 2148 case Expr::UnaryOperatorClass: { 2149 const UnaryOperator *Exp = cast<UnaryOperator>(Init); 2150 2151 switch (Exp->getOpcode()) { 2152 // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. 2153 // See C99 6.6p3. 2154 default: 2155 InitializerElementNotConstant(Init); 2156 return true; 2157 case UnaryOperator::OffsetOf: 2158 if (Exp->getSubExpr()->getType()->isConstantSizeType()) 2159 return false; 2160 InitializerElementNotConstant(Init); 2161 return true; 2162 case UnaryOperator::Extension: 2163 case UnaryOperator::LNot: 2164 case UnaryOperator::Plus: 2165 case UnaryOperator::Minus: 2166 case UnaryOperator::Not: 2167 return CheckArithmeticConstantExpression(Exp->getSubExpr()); 2168 } 2169 } 2170 case Expr::SizeOfAlignOfExprClass: { 2171 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(Init); 2172 // Special check for void types, which are allowed as an extension 2173 if (Exp->getTypeOfArgument()->isVoidType()) 2174 return false; 2175 // alignof always evaluates to a constant. 2176 // FIXME: is sizeof(int[3.0]) a constant expression? 2177 if (Exp->isSizeOf() && !Exp->getTypeOfArgument()->isConstantSizeType()) { 2178 InitializerElementNotConstant(Init); 2179 return true; 2180 } 2181 return false; 2182 } 2183 case Expr::BinaryOperatorClass: { 2184 const BinaryOperator *Exp = cast<BinaryOperator>(Init); 2185 2186 if (Exp->getLHS()->getType()->isArithmeticType() && 2187 Exp->getRHS()->getType()->isArithmeticType()) { 2188 return CheckArithmeticConstantExpression(Exp->getLHS()) || 2189 CheckArithmeticConstantExpression(Exp->getRHS()); 2190 } 2191 2192 if (Exp->getLHS()->getType()->isPointerType() && 2193 Exp->getRHS()->getType()->isPointerType()) { 2194 const Expr* LHSBase = FindExpressionBaseAddress(Exp->getLHS()); 2195 const Expr* RHSBase = FindExpressionBaseAddress(Exp->getRHS()); 2196 2197 // Only allow a null (constant integer) base; we could 2198 // allow some additional cases if necessary, but this 2199 // is sufficient to cover offsetof-like constructs. 2200 if (!LHSBase && !RHSBase) { 2201 return CheckAddressConstantExpression(Exp->getLHS()) || 2202 CheckAddressConstantExpression(Exp->getRHS()); 2203 } 2204 } 2205 2206 InitializerElementNotConstant(Init); 2207 return true; 2208 } 2209 case Expr::ImplicitCastExprClass: 2210 case Expr::CStyleCastExprClass: { 2211 const CastExpr *CE = cast<CastExpr>(Init); 2212 const Expr *SubExpr = CE->getSubExpr(); 2213 2214 if (SubExpr->getType()->isArithmeticType()) 2215 return CheckArithmeticConstantExpression(SubExpr); 2216 2217 if (SubExpr->getType()->isPointerType()) { 2218 const Expr* Base = FindExpressionBaseAddress(SubExpr); 2219 if (Base) { 2220 // the cast is only valid if done to a wide enough type 2221 if (Context.getTypeSize(CE->getType()) >= 2222 Context.getTypeSize(SubExpr->getType())) 2223 return false; 2224 } else { 2225 // If the pointer has a null base, this is an offsetof-like construct 2226 return CheckAddressConstantExpression(SubExpr); 2227 } 2228 } 2229 2230 InitializerElementNotConstant(Init); 2231 return true; 2232 } 2233 case Expr::ConditionalOperatorClass: { 2234 const ConditionalOperator *Exp = cast<ConditionalOperator>(Init); 2235 2236 // If GNU extensions are disabled, we require all operands to be arithmetic 2237 // constant expressions. 2238 if (getLangOptions().NoExtensions) { 2239 return CheckArithmeticConstantExpression(Exp->getCond()) || 2240 (Exp->getLHS() && CheckArithmeticConstantExpression(Exp->getLHS())) || 2241 CheckArithmeticConstantExpression(Exp->getRHS()); 2242 } 2243 2244 // Otherwise, we have to emulate some of the behavior of fold here. 2245 // Basically GCC treats things like "4 ? 1 : somefunc()" as a constant 2246 // because it can constant fold things away. To retain compatibility with 2247 // GCC code, we see if we can fold the condition to a constant (which we 2248 // should always be able to do in theory). If so, we only require the 2249 // specified arm of the conditional to be a constant. This is a horrible 2250 // hack, but is require by real world code that uses __builtin_constant_p. 2251 Expr::EvalResult EvalResult; 2252 if (!Exp->getCond()->Evaluate(EvalResult, Context) || 2253 EvalResult.HasSideEffects) { 2254 // If Evaluate couldn't fold it, CheckArithmeticConstantExpression 2255 // won't be able to either. Use it to emit the diagnostic though. 2256 bool Res = CheckArithmeticConstantExpression(Exp->getCond()); 2257 assert(Res && "Evaluate couldn't evaluate this constant?"); 2258 return Res; 2259 } 2260 2261 // Verify that the side following the condition is also a constant. 2262 const Expr *TrueSide = Exp->getLHS(), *FalseSide = Exp->getRHS(); 2263 if (EvalResult.Val.getInt() == 0) 2264 std::swap(TrueSide, FalseSide); 2265 2266 if (TrueSide && CheckArithmeticConstantExpression(TrueSide)) 2267 return true; 2268 2269 // Okay, the evaluated side evaluates to a constant, so we accept this. 2270 // Check to see if the other side is obviously not a constant. If so, 2271 // emit a warning that this is a GNU extension. 2272 if (FalseSide && !FalseSide->isEvaluatable(Context)) 2273 Diag(Init->getExprLoc(), 2274 diag::ext_typecheck_expression_not_constant_but_accepted) 2275 << FalseSide->getSourceRange(); 2276 return false; 2277 } 2278 } 2279} 2280 2281bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 2282 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) 2283 Init = DIE->getInit(); 2284 2285 Init = Init->IgnoreParens(); 2286 2287 if (Init->isEvaluatable(Context)) 2288 return false; 2289 2290 // Look through CXXDefaultArgExprs; they have no meaning in this context. 2291 if (CXXDefaultArgExpr* DAE = dyn_cast<CXXDefaultArgExpr>(Init)) 2292 return CheckForConstantInitializer(DAE->getExpr(), DclT); 2293 2294 if (CompoundLiteralExpr *e = dyn_cast<CompoundLiteralExpr>(Init)) 2295 return CheckForConstantInitializer(e->getInitializer(), DclT); 2296 2297 if (isa<ImplicitValueInitExpr>(Init)) { 2298 // FIXME: In C++, check for non-POD types. 2299 return false; 2300 } 2301 2302 if (InitListExpr *Exp = dyn_cast<InitListExpr>(Init)) { 2303 unsigned numInits = Exp->getNumInits(); 2304 for (unsigned i = 0; i < numInits; i++) { 2305 // FIXME: Need to get the type of the declaration for C++, 2306 // because it could be a reference? 2307 2308 if (CheckForConstantInitializer(Exp->getInit(i), 2309 Exp->getInit(i)->getType())) 2310 return true; 2311 } 2312 return false; 2313 } 2314 2315 // FIXME: We can probably remove some of this code below, now that 2316 // Expr::Evaluate is doing the heavy lifting for scalars. 2317 2318 if (Init->isNullPointerConstant(Context)) 2319 return false; 2320 if (Init->getType()->isArithmeticType()) { 2321 QualType InitTy = Context.getCanonicalType(Init->getType()) 2322 .getUnqualifiedType(); 2323 if (InitTy == Context.BoolTy) { 2324 // Special handling for pointers implicitly cast to bool; 2325 // (e.g. "_Bool rr = &rr;"). This is only legal at the top level. 2326 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Init)) { 2327 Expr* SubE = ICE->getSubExpr(); 2328 if (SubE->getType()->isPointerType() || 2329 SubE->getType()->isArrayType() || 2330 SubE->getType()->isFunctionType()) { 2331 return CheckAddressConstantExpression(Init); 2332 } 2333 } 2334 } else if (InitTy->isIntegralType()) { 2335 Expr* SubE = 0; 2336 if (CastExpr* CE = dyn_cast<CastExpr>(Init)) 2337 SubE = CE->getSubExpr(); 2338 // Special check for pointer cast to int; we allow as an extension 2339 // an address constant cast to an integer if the integer 2340 // is of an appropriate width (this sort of code is apparently used 2341 // in some places). 2342 // FIXME: Add pedwarn? 2343 // FIXME: Don't allow bitfields here! Need the FieldDecl for that. 2344 if (SubE && (SubE->getType()->isPointerType() || 2345 SubE->getType()->isArrayType() || 2346 SubE->getType()->isFunctionType())) { 2347 unsigned IntWidth = Context.getTypeSize(Init->getType()); 2348 unsigned PointerWidth = Context.getTypeSize(Context.VoidPtrTy); 2349 if (IntWidth >= PointerWidth) 2350 return CheckAddressConstantExpression(Init); 2351 } 2352 } 2353 2354 return CheckArithmeticConstantExpression(Init); 2355 } 2356 2357 if (Init->getType()->isPointerType()) 2358 return CheckAddressConstantExpression(Init); 2359 2360 // An array type at the top level that isn't an init-list must 2361 // be a string literal 2362 if (Init->getType()->isArrayType()) 2363 return false; 2364 2365 if (Init->getType()->isFunctionType()) 2366 return false; 2367 2368 // Allow block exprs at top level. 2369 if (Init->getType()->isBlockPointerType()) 2370 return false; 2371 2372 // GCC cast to union extension 2373 // note: the validity of the cast expr is checked by CheckCastTypes() 2374 if (CastExpr *C = dyn_cast<CastExpr>(Init)) { 2375 QualType T = C->getType(); 2376 return T->isUnionType() && CheckForConstantInitializer(C->getSubExpr(), T); 2377 } 2378 2379 InitializerElementNotConstant(Init); 2380 return true; 2381} 2382 2383void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init) { 2384 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 2385} 2386 2387/// AddInitializerToDecl - Adds the initializer Init to the 2388/// declaration dcl. If DirectInit is true, this is C++ direct 2389/// initialization rather than copy initialization. 2390void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init, bool DirectInit) { 2391 Decl *RealDecl = static_cast<Decl *>(dcl); 2392 Expr *Init = static_cast<Expr *>(init.release()); 2393 assert(Init && "missing initializer"); 2394 2395 // If there is no declaration, there was an error parsing it. Just ignore 2396 // the initializer. 2397 if (RealDecl == 0) { 2398 Init->Destroy(Context); 2399 return; 2400 } 2401 2402 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2403 if (!VDecl) { 2404 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2405 RealDecl->setInvalidDecl(); 2406 return; 2407 } 2408 // Get the decls type and save a reference for later, since 2409 // CheckInitializerTypes may change it. 2410 QualType DclT = VDecl->getType(), SavT = DclT; 2411 if (VDecl->isBlockVarDecl()) { 2412 VarDecl::StorageClass SC = VDecl->getStorageClass(); 2413 if (SC == VarDecl::Extern) { // C99 6.7.8p5 2414 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2415 VDecl->setInvalidDecl(); 2416 } else if (!VDecl->isInvalidDecl()) { 2417 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2418 VDecl->getDeclName(), DirectInit)) 2419 VDecl->setInvalidDecl(); 2420 2421 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2422 if (!getLangOptions().CPlusPlus) { 2423 if (SC == VarDecl::Static) // C99 6.7.8p4. 2424 CheckForConstantInitializer(Init, DclT); 2425 } 2426 } 2427 } else if (VDecl->isFileVarDecl()) { 2428 if (VDecl->getStorageClass() == VarDecl::Extern) 2429 Diag(VDecl->getLocation(), diag::warn_extern_init); 2430 if (!VDecl->isInvalidDecl()) 2431 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2432 VDecl->getDeclName(), DirectInit)) 2433 VDecl->setInvalidDecl(); 2434 2435 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2436 if (!getLangOptions().CPlusPlus) { 2437 // C99 6.7.8p4. All file scoped initializers need to be constant. 2438 CheckForConstantInitializer(Init, DclT); 2439 } 2440 } 2441 // If the type changed, it means we had an incomplete type that was 2442 // completed by the initializer. For example: 2443 // int ary[] = { 1, 3, 5 }; 2444 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2445 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2446 VDecl->setType(DclT); 2447 Init->setType(DclT); 2448 } 2449 2450 // Attach the initializer to the decl. 2451 VDecl->setInit(Init); 2452 return; 2453} 2454 2455void Sema::ActOnUninitializedDecl(DeclTy *dcl) { 2456 Decl *RealDecl = static_cast<Decl *>(dcl); 2457 2458 // If there is no declaration, there was an error parsing it. Just ignore it. 2459 if (RealDecl == 0) 2460 return; 2461 2462 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2463 QualType Type = Var->getType(); 2464 // C++ [dcl.init.ref]p3: 2465 // The initializer can be omitted for a reference only in a 2466 // parameter declaration (8.3.5), in the declaration of a 2467 // function return type, in the declaration of a class member 2468 // within its class declaration (9.2), and where the extern 2469 // specifier is explicitly used. 2470 if (Type->isReferenceType() && 2471 Var->getStorageClass() != VarDecl::Extern && 2472 Var->getStorageClass() != VarDecl::PrivateExtern) { 2473 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2474 << Var->getDeclName() 2475 << SourceRange(Var->getLocation(), Var->getLocation()); 2476 Var->setInvalidDecl(); 2477 return; 2478 } 2479 2480 // C++ [dcl.init]p9: 2481 // 2482 // If no initializer is specified for an object, and the object 2483 // is of (possibly cv-qualified) non-POD class type (or array 2484 // thereof), the object shall be default-initialized; if the 2485 // object is of const-qualified type, the underlying class type 2486 // shall have a user-declared default constructor. 2487 if (getLangOptions().CPlusPlus) { 2488 QualType InitType = Type; 2489 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2490 InitType = Array->getElementType(); 2491 if (Var->getStorageClass() != VarDecl::Extern && 2492 Var->getStorageClass() != VarDecl::PrivateExtern && 2493 InitType->isRecordType()) { 2494 const CXXConstructorDecl *Constructor 2495 = PerformInitializationByConstructor(InitType, 0, 0, 2496 Var->getLocation(), 2497 SourceRange(Var->getLocation(), 2498 Var->getLocation()), 2499 Var->getDeclName(), 2500 IK_Default); 2501 if (!Constructor) 2502 Var->setInvalidDecl(); 2503 } 2504 } 2505 2506#if 0 2507 // FIXME: Temporarily disabled because we are not properly parsing 2508 // linkage specifications on declarations, e.g., 2509 // 2510 // extern "C" const CGPoint CGPointerZero; 2511 // 2512 // C++ [dcl.init]p9: 2513 // 2514 // If no initializer is specified for an object, and the 2515 // object is of (possibly cv-qualified) non-POD class type (or 2516 // array thereof), the object shall be default-initialized; if 2517 // the object is of const-qualified type, the underlying class 2518 // type shall have a user-declared default 2519 // constructor. Otherwise, if no initializer is specified for 2520 // an object, the object and its subobjects, if any, have an 2521 // indeterminate initial value; if the object or any of its 2522 // subobjects are of const-qualified type, the program is 2523 // ill-formed. 2524 // 2525 // This isn't technically an error in C, so we don't diagnose it. 2526 // 2527 // FIXME: Actually perform the POD/user-defined default 2528 // constructor check. 2529 if (getLangOptions().CPlusPlus && 2530 Context.getCanonicalType(Type).isConstQualified() && 2531 Var->getStorageClass() != VarDecl::Extern) 2532 Diag(Var->getLocation(), diag::err_const_var_requires_init) 2533 << Var->getName() 2534 << SourceRange(Var->getLocation(), Var->getLocation()); 2535#endif 2536 } 2537} 2538 2539/// The declarators are chained together backwards, reverse the list. 2540Sema::DeclTy *Sema::FinalizeDeclaratorGroup(Scope *S, DeclTy *group) { 2541 // Often we have single declarators, handle them quickly. 2542 Decl *GroupDecl = static_cast<Decl*>(group); 2543 if (GroupDecl == 0) 2544 return 0; 2545 2546 Decl *Group = dyn_cast<Decl>(GroupDecl); 2547 Decl *NewGroup = 0; 2548 if (Group->getNextDeclarator() == 0) 2549 NewGroup = Group; 2550 else { // reverse the list. 2551 while (Group) { 2552 Decl *Next = Group->getNextDeclarator(); 2553 Group->setNextDeclarator(NewGroup); 2554 NewGroup = Group; 2555 Group = Next; 2556 } 2557 } 2558 // Perform semantic analysis that depends on having fully processed both 2559 // the declarator and initializer. 2560 for (Decl *ID = NewGroup; ID; ID = ID->getNextDeclarator()) { 2561 VarDecl *IDecl = dyn_cast<VarDecl>(ID); 2562 if (!IDecl) 2563 continue; 2564 QualType T = IDecl->getType(); 2565 2566 if (T->isVariableArrayType()) { 2567 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2568 2569 // FIXME: This won't give the correct result for 2570 // int a[10][n]; 2571 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2572 if (IDecl->isFileVarDecl()) { 2573 Diag(IDecl->getLocation(), diag::err_vla_decl_in_file_scope) << 2574 SizeRange; 2575 2576 IDecl->setInvalidDecl(); 2577 } else { 2578 // C99 6.7.5.2p2: If an identifier is declared to be an object with 2579 // static storage duration, it shall not have a variable length array. 2580 if (IDecl->getStorageClass() == VarDecl::Static) { 2581 Diag(IDecl->getLocation(), diag::err_vla_decl_has_static_storage) 2582 << SizeRange; 2583 IDecl->setInvalidDecl(); 2584 } else if (IDecl->getStorageClass() == VarDecl::Extern) { 2585 Diag(IDecl->getLocation(), diag::err_vla_decl_has_extern_linkage) 2586 << SizeRange; 2587 IDecl->setInvalidDecl(); 2588 } 2589 } 2590 } else if (T->isVariablyModifiedType()) { 2591 if (IDecl->isFileVarDecl()) { 2592 Diag(IDecl->getLocation(), diag::err_vm_decl_in_file_scope); 2593 IDecl->setInvalidDecl(); 2594 } else { 2595 if (IDecl->getStorageClass() == VarDecl::Extern) { 2596 Diag(IDecl->getLocation(), diag::err_vm_decl_has_extern_linkage); 2597 IDecl->setInvalidDecl(); 2598 } 2599 } 2600 } 2601 2602 // Block scope. C99 6.7p7: If an identifier for an object is declared with 2603 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 2604 if (IDecl->isBlockVarDecl() && 2605 IDecl->getStorageClass() != VarDecl::Extern) { 2606 if (!IDecl->isInvalidDecl() && 2607 DiagnoseIncompleteType(IDecl->getLocation(), T, 2608 diag::err_typecheck_decl_incomplete_type)) 2609 IDecl->setInvalidDecl(); 2610 } 2611 // File scope. C99 6.9.2p2: A declaration of an identifier for and 2612 // object that has file scope without an initializer, and without a 2613 // storage-class specifier or with the storage-class specifier "static", 2614 // constitutes a tentative definition. Note: A tentative definition with 2615 // external linkage is valid (C99 6.2.2p5). 2616 if (isTentativeDefinition(IDecl)) { 2617 if (T->isIncompleteArrayType()) { 2618 // C99 6.9.2 (p2, p5): Implicit initialization causes an incomplete 2619 // array to be completed. Don't issue a diagnostic. 2620 } else if (!IDecl->isInvalidDecl() && 2621 DiagnoseIncompleteType(IDecl->getLocation(), T, 2622 diag::err_typecheck_decl_incomplete_type)) 2623 // C99 6.9.2p3: If the declaration of an identifier for an object is 2624 // a tentative definition and has internal linkage (C99 6.2.2p3), the 2625 // declared type shall not be an incomplete type. 2626 IDecl->setInvalidDecl(); 2627 } 2628 if (IDecl->isFileVarDecl()) 2629 CheckForFileScopedRedefinitions(S, IDecl); 2630 } 2631 return NewGroup; 2632} 2633 2634/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 2635/// to introduce parameters into function prototype scope. 2636Sema::DeclTy * 2637Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 2638 const DeclSpec &DS = D.getDeclSpec(); 2639 2640 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 2641 VarDecl::StorageClass StorageClass = VarDecl::None; 2642 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2643 StorageClass = VarDecl::Register; 2644 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2645 Diag(DS.getStorageClassSpecLoc(), 2646 diag::err_invalid_storage_class_in_func_decl); 2647 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2648 } 2649 if (DS.isThreadSpecified()) { 2650 Diag(DS.getThreadSpecLoc(), 2651 diag::err_invalid_storage_class_in_func_decl); 2652 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2653 } 2654 2655 // Check that there are no default arguments inside the type of this 2656 // parameter (C++ only). 2657 if (getLangOptions().CPlusPlus) 2658 CheckExtraCXXDefaultArguments(D); 2659 2660 // In this context, we *do not* check D.getInvalidType(). If the declarator 2661 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 2662 // though it will not reflect the user specified type. 2663 QualType parmDeclType = GetTypeForDeclarator(D, S); 2664 2665 assert(!parmDeclType.isNull() && "GetTypeForDeclarator() returned null type"); 2666 2667 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 2668 // Can this happen for params? We already checked that they don't conflict 2669 // among each other. Here they can only shadow globals, which is ok. 2670 IdentifierInfo *II = D.getIdentifier(); 2671 if (II) { 2672 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2673 if (PrevDecl->isTemplateParameter()) { 2674 // Maybe we will complain about the shadowed template parameter. 2675 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2676 // Just pretend that we didn't see the previous declaration. 2677 PrevDecl = 0; 2678 } else if (S->isDeclScope(PrevDecl)) { 2679 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 2680 2681 // Recover by removing the name 2682 II = 0; 2683 D.SetIdentifier(0, D.getIdentifierLoc()); 2684 } 2685 } 2686 } 2687 2688 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 2689 // Doing the promotion here has a win and a loss. The win is the type for 2690 // both Decl's and DeclRefExpr's will match (a convenient invariant for the 2691 // code generator). The loss is the orginal type isn't preserved. For example: 2692 // 2693 // void func(int parmvardecl[5]) { // convert "int [5]" to "int *" 2694 // int blockvardecl[5]; 2695 // sizeof(parmvardecl); // size == 4 2696 // sizeof(blockvardecl); // size == 20 2697 // } 2698 // 2699 // For expressions, all implicit conversions are captured using the 2700 // ImplicitCastExpr AST node (we have no such mechanism for Decl's). 2701 // 2702 // FIXME: If a source translation tool needs to see the original type, then 2703 // we need to consider storing both types (in ParmVarDecl)... 2704 // 2705 if (parmDeclType->isArrayType()) { 2706 // int x[restrict 4] -> int *restrict 2707 parmDeclType = Context.getArrayDecayedType(parmDeclType); 2708 } else if (parmDeclType->isFunctionType()) 2709 parmDeclType = Context.getPointerType(parmDeclType); 2710 2711 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, 2712 D.getIdentifierLoc(), II, 2713 parmDeclType, StorageClass, 2714 0); 2715 2716 if (D.getInvalidType()) 2717 New->setInvalidDecl(); 2718 2719 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 2720 if (D.getCXXScopeSpec().isSet()) { 2721 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 2722 << D.getCXXScopeSpec().getRange(); 2723 New->setInvalidDecl(); 2724 } 2725 2726 // Add the parameter declaration into this scope. 2727 S->AddDecl(New); 2728 if (II) 2729 IdResolver.AddDecl(New); 2730 2731 ProcessDeclAttributes(New, D); 2732 return New; 2733 2734} 2735 2736void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D) { 2737 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2738 "Not a function declarator!"); 2739 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2740 2741 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 2742 // for a K&R function. 2743 if (!FTI.hasPrototype) { 2744 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2745 if (FTI.ArgInfo[i].Param == 0) { 2746 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 2747 << FTI.ArgInfo[i].Ident; 2748 // Implicitly declare the argument as type 'int' for lack of a better 2749 // type. 2750 DeclSpec DS; 2751 const char* PrevSpec; // unused 2752 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 2753 PrevSpec); 2754 Declarator ParamD(DS, Declarator::KNRTypeListContext); 2755 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 2756 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 2757 } 2758 } 2759 } 2760} 2761 2762Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 2763 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 2764 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2765 "Not a function declarator!"); 2766 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2767 2768 if (FTI.hasPrototype) { 2769 // FIXME: Diagnose arguments without names in C. 2770 } 2771 2772 Scope *ParentScope = FnBodyScope->getParent(); 2773 2774 return ActOnStartOfFunctionDef(FnBodyScope, 2775 ActOnDeclarator(ParentScope, D, 0, 2776 /*IsFunctionDefinition=*/true)); 2777} 2778 2779Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclTy *D) { 2780 Decl *decl = static_cast<Decl*>(D); 2781 FunctionDecl *FD = cast<FunctionDecl>(decl); 2782 2783 // See if this is a redefinition. 2784 const FunctionDecl *Definition; 2785 if (FD->getBody(Definition)) { 2786 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 2787 Diag(Definition->getLocation(), diag::note_previous_definition); 2788 } 2789 2790 // Builtin functions cannot be defined. 2791 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 2792 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2793 Diag(FD->getLocation(), diag::err_builtin_lib_definition) << FD; 2794 Diag(FD->getLocation(), diag::note_builtin_lib_def_freestanding); 2795 } else 2796 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 2797 FD->setInvalidDecl(); 2798 } 2799 2800 PushDeclContext(FnBodyScope, FD); 2801 2802 // Check the validity of our function parameters 2803 CheckParmsForFunctionDef(FD); 2804 2805 // Introduce our parameters into the function scope 2806 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 2807 ParmVarDecl *Param = FD->getParamDecl(p); 2808 Param->setOwningFunction(FD); 2809 2810 // If this has an identifier, add it to the scope stack. 2811 if (Param->getIdentifier()) 2812 PushOnScopeChains(Param, FnBodyScope); 2813 } 2814 2815 // Checking attributes of current function definition 2816 // dllimport attribute. 2817 if (FD->getAttr<DLLImportAttr>() && (!FD->getAttr<DLLExportAttr>())) { 2818 // dllimport attribute cannot be applied to definition. 2819 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 2820 Diag(FD->getLocation(), 2821 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 2822 << "dllimport"; 2823 FD->setInvalidDecl(); 2824 return FD; 2825 } else { 2826 // If a symbol previously declared dllimport is later defined, the 2827 // attribute is ignored in subsequent references, and a warning is 2828 // emitted. 2829 Diag(FD->getLocation(), 2830 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 2831 << FD->getNameAsCString() << "dllimport"; 2832 } 2833 } 2834 return FD; 2835} 2836 2837Sema::DeclTy *Sema::ActOnFinishFunctionBody(DeclTy *D, StmtArg BodyArg) { 2838 Decl *dcl = static_cast<Decl *>(D); 2839 Stmt *Body = static_cast<Stmt*>(BodyArg.release()); 2840 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 2841 FD->setBody(Body); 2842 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 2843 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 2844 assert(MD == getCurMethodDecl() && "Method parsing confused"); 2845 MD->setBody((Stmt*)Body); 2846 } else { 2847 Body->Destroy(Context); 2848 return 0; 2849 } 2850 PopDeclContext(); 2851 // Verify and clean out per-function state. 2852 2853 // Check goto/label use. 2854 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 2855 I = LabelMap.begin(), E = LabelMap.end(); I != E; ++I) { 2856 // Verify that we have no forward references left. If so, there was a goto 2857 // or address of a label taken, but no definition of it. Label fwd 2858 // definitions are indicated with a null substmt. 2859 if (I->second->getSubStmt() == 0) { 2860 LabelStmt *L = I->second; 2861 // Emit error. 2862 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 2863 2864 // At this point, we have gotos that use the bogus label. Stitch it into 2865 // the function body so that they aren't leaked and that the AST is well 2866 // formed. 2867 if (Body) { 2868#if 0 2869 // FIXME: Why do this? Having a 'push_back' in CompoundStmt is ugly, 2870 // and the AST is malformed anyway. We should just blow away 'L'. 2871 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 2872 cast<CompoundStmt>(Body)->push_back(L); 2873#else 2874 L->Destroy(Context); 2875#endif 2876 } else { 2877 // The whole function wasn't parsed correctly, just delete this. 2878 L->Destroy(Context); 2879 } 2880 } 2881 } 2882 LabelMap.clear(); 2883 2884 return D; 2885} 2886 2887/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 2888/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 2889NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 2890 IdentifierInfo &II, Scope *S) { 2891 // Extension in C99. Legal in C90, but warn about it. 2892 if (getLangOptions().C99) 2893 Diag(Loc, diag::ext_implicit_function_decl) << &II; 2894 else 2895 Diag(Loc, diag::warn_implicit_function_decl) << &II; 2896 2897 // FIXME: handle stuff like: 2898 // void foo() { extern float X(); } 2899 // void bar() { X(); } <-- implicit decl for X in another scope. 2900 2901 // Set a Declarator for the implicit definition: int foo(); 2902 const char *Dummy; 2903 DeclSpec DS; 2904 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 2905 Error = Error; // Silence warning. 2906 assert(!Error && "Error setting up implicit decl!"); 2907 Declarator D(DS, Declarator::BlockContext); 2908 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, 0, 0, 0, Loc, D), 2909 SourceLocation()); 2910 D.SetIdentifier(&II, Loc); 2911 2912 // Insert this function into translation-unit scope. 2913 2914 DeclContext *PrevDC = CurContext; 2915 CurContext = Context.getTranslationUnitDecl(); 2916 2917 FunctionDecl *FD = 2918 dyn_cast<FunctionDecl>(static_cast<Decl*>(ActOnDeclarator(TUScope, D, 0))); 2919 FD->setImplicit(); 2920 2921 CurContext = PrevDC; 2922 2923 AddKnownFunctionAttributes(FD); 2924 2925 return FD; 2926} 2927 2928/// \brief Adds any function attributes that we know a priori based on 2929/// the declaration of this function. 2930/// 2931/// These attributes can apply both to implicitly-declared builtins 2932/// (like __builtin___printf_chk) or to library-declared functions 2933/// like NSLog or printf. 2934void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 2935 if (FD->isInvalidDecl()) 2936 return; 2937 2938 // If this is a built-in function, map its builtin attributes to 2939 // actual attributes. 2940 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 2941 // Handle printf-formatting attributes. 2942 unsigned FormatIdx; 2943 bool HasVAListArg; 2944 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 2945 if (!FD->getAttr<FormatAttr>()) 2946 FD->addAttr(new FormatAttr("printf", FormatIdx + 1, FormatIdx + 2)); 2947 } 2948 } 2949 2950 IdentifierInfo *Name = FD->getIdentifier(); 2951 if (!Name) 2952 return; 2953 if ((!getLangOptions().CPlusPlus && 2954 FD->getDeclContext()->isTranslationUnit()) || 2955 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 2956 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 2957 LinkageSpecDecl::lang_c)) { 2958 // Okay: this could be a libc/libm/Objective-C function we know 2959 // about. 2960 } else 2961 return; 2962 2963 unsigned KnownID; 2964 for (KnownID = 0; KnownID != id_num_known_functions; ++KnownID) 2965 if (KnownFunctionIDs[KnownID] == Name) 2966 break; 2967 2968 switch (KnownID) { 2969 case id_NSLog: 2970 case id_NSLogv: 2971 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 2972 // FIXME: We known better than our headers. 2973 const_cast<FormatAttr *>(Format)->setType("printf"); 2974 } else 2975 FD->addAttr(new FormatAttr("printf", 1, 2)); 2976 break; 2977 2978 case id_asprintf: 2979 case id_vasprintf: 2980 if (!FD->getAttr<FormatAttr>()) 2981 FD->addAttr(new FormatAttr("printf", 2, 3)); 2982 break; 2983 2984 default: 2985 // Unknown function or known function without any attributes to 2986 // add. Do nothing. 2987 break; 2988 } 2989} 2990 2991TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 2992 Decl *LastDeclarator) { 2993 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 2994 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 2995 2996 // Scope manipulation handled by caller. 2997 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 2998 D.getIdentifierLoc(), 2999 D.getIdentifier(), 3000 T); 3001 NewTD->setNextDeclarator(LastDeclarator); 3002 if (D.getInvalidType()) 3003 NewTD->setInvalidDecl(); 3004 return NewTD; 3005} 3006 3007/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 3008/// former case, Name will be non-null. In the later case, Name will be null. 3009/// TagSpec indicates what kind of tag this is. TK indicates whether this is a 3010/// reference/declaration/definition of a tag. 3011Sema::DeclTy *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, 3012 SourceLocation KWLoc, const CXXScopeSpec &SS, 3013 IdentifierInfo *Name, SourceLocation NameLoc, 3014 AttributeList *Attr) { 3015 // If this is not a definition, it must have a name. 3016 assert((Name != 0 || TK == TK_Definition) && 3017 "Nameless record must be a definition!"); 3018 3019 TagDecl::TagKind Kind; 3020 switch (TagSpec) { 3021 default: assert(0 && "Unknown tag type!"); 3022 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 3023 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 3024 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 3025 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 3026 } 3027 3028 DeclContext *SearchDC = CurContext; 3029 DeclContext *DC = CurContext; 3030 NamedDecl *PrevDecl = 0; 3031 3032 bool Invalid = false; 3033 3034 if (Name && SS.isNotEmpty()) { 3035 // We have a nested-name tag ('struct foo::bar'). 3036 3037 // Check for invalid 'foo::'. 3038 if (SS.isInvalid()) { 3039 Name = 0; 3040 goto CreateNewDecl; 3041 } 3042 3043 DC = static_cast<DeclContext*>(SS.getScopeRep()); 3044 SearchDC = DC; 3045 // Look-up name inside 'foo::'. 3046 PrevDecl = dyn_cast_or_null<TagDecl>( 3047 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 3048 3049 // A tag 'foo::bar' must already exist. 3050 if (PrevDecl == 0) { 3051 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 3052 Name = 0; 3053 goto CreateNewDecl; 3054 } 3055 } else if (Name) { 3056 // If this is a named struct, check to see if there was a previous forward 3057 // declaration or definition. 3058 // FIXME: We're looking into outer scopes here, even when we 3059 // shouldn't be. Doing so can result in ambiguities that we 3060 // shouldn't be diagnosing. 3061 LookupResult R = LookupName(S, Name, LookupTagName, 3062 /*RedeclarationOnly=*/(TK != TK_Reference)); 3063 if (R.isAmbiguous()) { 3064 DiagnoseAmbiguousLookup(R, Name, NameLoc); 3065 // FIXME: This is not best way to recover from case like: 3066 // 3067 // struct S s; 3068 // 3069 // causes needless err_ovl_no_viable_function_in_init latter. 3070 Name = 0; 3071 PrevDecl = 0; 3072 Invalid = true; 3073 } 3074 else 3075 PrevDecl = R; 3076 3077 if (!getLangOptions().CPlusPlus && TK != TK_Reference) { 3078 // FIXME: This makes sure that we ignore the contexts associated 3079 // with C structs, unions, and enums when looking for a matching 3080 // tag declaration or definition. See the similar lookup tweak 3081 // in Sema::LookupName; is there a better way to deal with this? 3082 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 3083 SearchDC = SearchDC->getParent(); 3084 } 3085 } 3086 3087 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3088 // Maybe we will complain about the shadowed template parameter. 3089 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 3090 // Just pretend that we didn't see the previous declaration. 3091 PrevDecl = 0; 3092 } 3093 3094 if (PrevDecl) { 3095 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 3096 // If this is a use of a previous tag, or if the tag is already declared 3097 // in the same scope (so that the definition/declaration completes or 3098 // rementions the tag), reuse the decl. 3099 if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { 3100 // Make sure that this wasn't declared as an enum and now used as a 3101 // struct or something similar. 3102 if (PrevTagDecl->getTagKind() != Kind) { 3103 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 3104 Diag(PrevDecl->getLocation(), diag::note_previous_use); 3105 // Recover by making this an anonymous redefinition. 3106 Name = 0; 3107 PrevDecl = 0; 3108 Invalid = true; 3109 } else { 3110 // If this is a use, just return the declaration we found. 3111 3112 // FIXME: In the future, return a variant or some other clue 3113 // for the consumer of this Decl to know it doesn't own it. 3114 // For our current ASTs this shouldn't be a problem, but will 3115 // need to be changed with DeclGroups. 3116 if (TK == TK_Reference) 3117 return PrevDecl; 3118 3119 // Diagnose attempts to redefine a tag. 3120 if (TK == TK_Definition) { 3121 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 3122 Diag(NameLoc, diag::err_redefinition) << Name; 3123 Diag(Def->getLocation(), diag::note_previous_definition); 3124 // If this is a redefinition, recover by making this 3125 // struct be anonymous, which will make any later 3126 // references get the previous definition. 3127 Name = 0; 3128 PrevDecl = 0; 3129 Invalid = true; 3130 } else { 3131 // If the type is currently being defined, complain 3132 // about a nested redefinition. 3133 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 3134 if (Tag->isBeingDefined()) { 3135 Diag(NameLoc, diag::err_nested_redefinition) << Name; 3136 Diag(PrevTagDecl->getLocation(), 3137 diag::note_previous_definition); 3138 Name = 0; 3139 PrevDecl = 0; 3140 Invalid = true; 3141 } 3142 } 3143 3144 // Okay, this is definition of a previously declared or referenced 3145 // tag PrevDecl. We're going to create a new Decl for it. 3146 } 3147 } 3148 // If we get here we have (another) forward declaration or we 3149 // have a definition. Just create a new decl. 3150 } else { 3151 // If we get here, this is a definition of a new tag type in a nested 3152 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 3153 // new decl/type. We set PrevDecl to NULL so that the entities 3154 // have distinct types. 3155 PrevDecl = 0; 3156 } 3157 // If we get here, we're going to create a new Decl. If PrevDecl 3158 // is non-NULL, it's a definition of the tag declared by 3159 // PrevDecl. If it's NULL, we have a new definition. 3160 } else { 3161 // PrevDecl is a namespace, template, or anything else 3162 // that lives in the IDNS_Tag identifier namespace. 3163 if (isDeclInScope(PrevDecl, SearchDC, S)) { 3164 // The tag name clashes with a namespace name, issue an error and 3165 // recover by making this tag be anonymous. 3166 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 3167 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3168 Name = 0; 3169 PrevDecl = 0; 3170 Invalid = true; 3171 } else { 3172 // The existing declaration isn't relevant to us; we're in a 3173 // new scope, so clear out the previous declaration. 3174 PrevDecl = 0; 3175 } 3176 } 3177 } else if (TK == TK_Reference && SS.isEmpty() && Name && 3178 (Kind != TagDecl::TK_enum)) { 3179 // C++ [basic.scope.pdecl]p5: 3180 // -- for an elaborated-type-specifier of the form 3181 // 3182 // class-key identifier 3183 // 3184 // if the elaborated-type-specifier is used in the 3185 // decl-specifier-seq or parameter-declaration-clause of a 3186 // function defined in namespace scope, the identifier is 3187 // declared as a class-name in the namespace that contains 3188 // the declaration; otherwise, except as a friend 3189 // declaration, the identifier is declared in the smallest 3190 // non-class, non-function-prototype scope that contains the 3191 // declaration. 3192 // 3193 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 3194 // C structs and unions. 3195 3196 // Find the context where we'll be declaring the tag. 3197 // FIXME: We would like to maintain the current DeclContext as the 3198 // lexical context, 3199 while (SearchDC->isRecord()) 3200 SearchDC = SearchDC->getParent(); 3201 3202 // Find the scope where we'll be declaring the tag. 3203 while (S->isClassScope() || 3204 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 3205 ((S->getFlags() & Scope::DeclScope) == 0) || 3206 (S->getEntity() && 3207 ((DeclContext *)S->getEntity())->isTransparentContext())) 3208 S = S->getParent(); 3209 } 3210 3211CreateNewDecl: 3212 3213 // If there is an identifier, use the location of the identifier as the 3214 // location of the decl, otherwise use the location of the struct/union 3215 // keyword. 3216 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 3217 3218 // Otherwise, create a new declaration. If there is a previous 3219 // declaration of the same entity, the two will be linked via 3220 // PrevDecl. 3221 TagDecl *New; 3222 3223 if (Kind == TagDecl::TK_enum) { 3224 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3225 // enum X { A, B, C } D; D should chain to X. 3226 New = EnumDecl::Create(Context, SearchDC, Loc, Name, 3227 cast_or_null<EnumDecl>(PrevDecl)); 3228 // If this is an undefined enum, warn. 3229 if (TK != TK_Definition) Diag(Loc, diag::ext_forward_ref_enum); 3230 } else { 3231 // struct/union/class 3232 3233 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3234 // struct X { int A; } D; D should chain to X. 3235 if (getLangOptions().CPlusPlus) 3236 // FIXME: Look for a way to use RecordDecl for simple structs. 3237 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3238 cast_or_null<CXXRecordDecl>(PrevDecl)); 3239 else 3240 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3241 cast_or_null<RecordDecl>(PrevDecl)); 3242 } 3243 3244 if (Kind != TagDecl::TK_enum) { 3245 // Handle #pragma pack: if the #pragma pack stack has non-default 3246 // alignment, make up a packed attribute for this decl. These 3247 // attributes are checked when the ASTContext lays out the 3248 // structure. 3249 // 3250 // It is important for implementing the correct semantics that this 3251 // happen here (in act on tag decl). The #pragma pack stack is 3252 // maintained as a result of parser callbacks which can occur at 3253 // many points during the parsing of a struct declaration (because 3254 // the #pragma tokens are effectively skipped over during the 3255 // parsing of the struct). 3256 if (unsigned Alignment = PackContext.getAlignment()) 3257 New->addAttr(new PackedAttr(Alignment * 8)); 3258 } 3259 3260 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 3261 // C++ [dcl.typedef]p3: 3262 // [...] Similarly, in a given scope, a class or enumeration 3263 // shall not be declared with the same name as a typedef-name 3264 // that is declared in that scope and refers to a type other 3265 // than the class or enumeration itself. 3266 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 3267 TypedefDecl *PrevTypedef = 0; 3268 if (Lookup.getKind() == LookupResult::Found) 3269 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 3270 3271 if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && 3272 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 3273 Context.getCanonicalType(Context.getTypeDeclType(New))) { 3274 Diag(Loc, diag::err_tag_definition_of_typedef) 3275 << Context.getTypeDeclType(New) 3276 << PrevTypedef->getUnderlyingType(); 3277 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 3278 Invalid = true; 3279 } 3280 } 3281 3282 if (Invalid) 3283 New->setInvalidDecl(); 3284 3285 if (Attr) 3286 ProcessDeclAttributeList(New, Attr); 3287 3288 // If we're declaring or defining a tag in function prototype scope 3289 // in C, note that this type can only be used within the function. 3290 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 3291 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 3292 3293 // Set the lexical context. If the tag has a C++ scope specifier, the 3294 // lexical context will be different from the semantic context. 3295 New->setLexicalDeclContext(CurContext); 3296 3297 if (TK == TK_Definition) 3298 New->startDefinition(); 3299 3300 // If this has an identifier, add it to the scope stack. 3301 if (Name) { 3302 S = getNonFieldDeclScope(S); 3303 PushOnScopeChains(New, S); 3304 } else { 3305 CurContext->addDecl(New); 3306 } 3307 3308 return New; 3309} 3310 3311void Sema::ActOnTagStartDefinition(Scope *S, DeclTy *TagD) { 3312 AdjustDeclIfTemplate(TagD); 3313 TagDecl *Tag = cast<TagDecl>((Decl *)TagD); 3314 3315 // Enter the tag context. 3316 PushDeclContext(S, Tag); 3317 3318 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 3319 FieldCollector->StartClass(); 3320 3321 if (Record->getIdentifier()) { 3322 // C++ [class]p2: 3323 // [...] The class-name is also inserted into the scope of the 3324 // class itself; this is known as the injected-class-name. For 3325 // purposes of access checking, the injected-class-name is treated 3326 // as if it were a public member name. 3327 RecordDecl *InjectedClassName 3328 = CXXRecordDecl::Create(Context, Record->getTagKind(), 3329 CurContext, Record->getLocation(), 3330 Record->getIdentifier(), Record); 3331 InjectedClassName->setImplicit(); 3332 PushOnScopeChains(InjectedClassName, S); 3333 } 3334 } 3335} 3336 3337void Sema::ActOnTagFinishDefinition(Scope *S, DeclTy *TagD) { 3338 AdjustDeclIfTemplate(TagD); 3339 TagDecl *Tag = cast<TagDecl>((Decl *)TagD); 3340 3341 if (isa<CXXRecordDecl>(Tag)) 3342 FieldCollector->FinishClass(); 3343 3344 // Exit this scope of this tag's definition. 3345 PopDeclContext(); 3346 3347 // Notify the consumer that we've defined a tag. 3348 Consumer.HandleTagDeclDefinition(Tag); 3349} 3350 3351/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3352/// types into constant array types in certain situations which would otherwise 3353/// be errors (for GCC compatibility). 3354static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3355 ASTContext &Context) { 3356 // This method tries to turn a variable array into a constant 3357 // array even when the size isn't an ICE. This is necessary 3358 // for compatibility with code that depends on gcc's buggy 3359 // constant expression folding, like struct {char x[(int)(char*)2];} 3360 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3361 if (!VLATy) return QualType(); 3362 3363 Expr::EvalResult EvalResult; 3364 if (!VLATy->getSizeExpr() || 3365 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context)) 3366 return QualType(); 3367 3368 assert(EvalResult.Val.isInt() && "Size expressions must be integers!"); 3369 llvm::APSInt &Res = EvalResult.Val.getInt(); 3370 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) 3371 return Context.getConstantArrayType(VLATy->getElementType(), 3372 Res, ArrayType::Normal, 0); 3373 return QualType(); 3374} 3375 3376bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 3377 QualType FieldTy, const Expr *BitWidth) { 3378 // FIXME: 6.7.2.1p4 - verify the field type. 3379 3380 llvm::APSInt Value; 3381 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 3382 return true; 3383 3384 // Zero-width bitfield is ok for anonymous field. 3385 if (Value == 0 && FieldName) 3386 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 3387 3388 if (Value.isNegative()) 3389 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) << FieldName; 3390 3391 uint64_t TypeSize = Context.getTypeSize(FieldTy); 3392 // FIXME: We won't need the 0 size once we check that the field type is valid. 3393 if (TypeSize && Value.getZExtValue() > TypeSize) 3394 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 3395 << FieldName << (unsigned)TypeSize; 3396 3397 return false; 3398} 3399 3400/// ActOnField - Each field of a struct/union/class is passed into this in order 3401/// to create a FieldDecl object for it. 3402Sema::DeclTy *Sema::ActOnField(Scope *S, DeclTy *TagD, 3403 SourceLocation DeclStart, 3404 Declarator &D, ExprTy *BitfieldWidth) { 3405 IdentifierInfo *II = D.getIdentifier(); 3406 Expr *BitWidth = (Expr*)BitfieldWidth; 3407 SourceLocation Loc = DeclStart; 3408 RecordDecl *Record = (RecordDecl *)TagD; 3409 if (II) Loc = D.getIdentifierLoc(); 3410 3411 // FIXME: Unnamed fields can be handled in various different ways, for 3412 // example, unnamed unions inject all members into the struct namespace! 3413 3414 QualType T = GetTypeForDeclarator(D, S); 3415 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3416 bool InvalidDecl = false; 3417 3418 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3419 // than a variably modified type. 3420 if (T->isVariablyModifiedType()) { 3421 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context); 3422 if (!FixedTy.isNull()) { 3423 Diag(Loc, diag::warn_illegal_constant_array_size); 3424 T = FixedTy; 3425 } else { 3426 Diag(Loc, diag::err_typecheck_field_variable_size); 3427 T = Context.IntTy; 3428 InvalidDecl = true; 3429 } 3430 } 3431 3432 if (BitWidth) { 3433 if (VerifyBitField(Loc, II, T, BitWidth)) 3434 InvalidDecl = true; 3435 } else { 3436 // Not a bitfield. 3437 3438 // validate II. 3439 3440 } 3441 3442 // FIXME: Chain fielddecls together. 3443 FieldDecl *NewFD; 3444 3445 NewFD = FieldDecl::Create(Context, Record, 3446 Loc, II, T, BitWidth, 3447 D.getDeclSpec().getStorageClassSpec() == 3448 DeclSpec::SCS_mutable); 3449 3450 if (II) { 3451 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3452 if (PrevDecl && isDeclInScope(PrevDecl, CurContext, S) 3453 && !isa<TagDecl>(PrevDecl)) { 3454 Diag(Loc, diag::err_duplicate_member) << II; 3455 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3456 NewFD->setInvalidDecl(); 3457 Record->setInvalidDecl(); 3458 } 3459 } 3460 3461 if (getLangOptions().CPlusPlus) { 3462 CheckExtraCXXDefaultArguments(D); 3463 if (!T->isPODType()) 3464 cast<CXXRecordDecl>(Record)->setPOD(false); 3465 } 3466 3467 ProcessDeclAttributes(NewFD, D); 3468 3469 if (D.getInvalidType() || InvalidDecl) 3470 NewFD->setInvalidDecl(); 3471 3472 if (II) { 3473 PushOnScopeChains(NewFD, S); 3474 } else 3475 Record->addDecl(NewFD); 3476 3477 return NewFD; 3478} 3479 3480/// TranslateIvarVisibility - Translate visibility from a token ID to an 3481/// AST enum value. 3482static ObjCIvarDecl::AccessControl 3483TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 3484 switch (ivarVisibility) { 3485 default: assert(0 && "Unknown visitibility kind"); 3486 case tok::objc_private: return ObjCIvarDecl::Private; 3487 case tok::objc_public: return ObjCIvarDecl::Public; 3488 case tok::objc_protected: return ObjCIvarDecl::Protected; 3489 case tok::objc_package: return ObjCIvarDecl::Package; 3490 } 3491} 3492 3493/// ActOnIvar - Each ivar field of an objective-c class is passed into this 3494/// in order to create an IvarDecl object for it. 3495Sema::DeclTy *Sema::ActOnIvar(Scope *S, 3496 SourceLocation DeclStart, 3497 Declarator &D, ExprTy *BitfieldWidth, 3498 tok::ObjCKeywordKind Visibility) { 3499 3500 IdentifierInfo *II = D.getIdentifier(); 3501 Expr *BitWidth = (Expr*)BitfieldWidth; 3502 SourceLocation Loc = DeclStart; 3503 if (II) Loc = D.getIdentifierLoc(); 3504 3505 // FIXME: Unnamed fields can be handled in various different ways, for 3506 // example, unnamed unions inject all members into the struct namespace! 3507 3508 QualType T = GetTypeForDeclarator(D, S); 3509 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3510 bool InvalidDecl = false; 3511 3512 if (BitWidth) { 3513 // TODO: Validate. 3514 //printf("WARNING: BITFIELDS IGNORED!\n"); 3515 3516 // 6.7.2.1p3 3517 // 6.7.2.1p4 3518 3519 } else { 3520 // Not a bitfield. 3521 3522 // validate II. 3523 3524 } 3525 3526 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3527 // than a variably modified type. 3528 if (T->isVariablyModifiedType()) { 3529 Diag(Loc, diag::err_typecheck_ivar_variable_size); 3530 InvalidDecl = true; 3531 } 3532 3533 // Get the visibility (access control) for this ivar. 3534 ObjCIvarDecl::AccessControl ac = 3535 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 3536 : ObjCIvarDecl::None; 3537 3538 // Construct the decl. 3539 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, Loc, II, T, ac, 3540 (Expr *)BitfieldWidth); 3541 3542 if (II) { 3543 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3544 if (PrevDecl && isDeclInScope(PrevDecl, CurContext, S) 3545 && !isa<TagDecl>(PrevDecl)) { 3546 Diag(Loc, diag::err_duplicate_member) << II; 3547 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3548 NewID->setInvalidDecl(); 3549 } 3550 } 3551 3552 // Process attributes attached to the ivar. 3553 ProcessDeclAttributes(NewID, D); 3554 3555 if (D.getInvalidType() || InvalidDecl) 3556 NewID->setInvalidDecl(); 3557 3558 if (II) { 3559 // FIXME: When interfaces are DeclContexts, we'll need to add 3560 // these to the interface. 3561 S->AddDecl(NewID); 3562 IdResolver.AddDecl(NewID); 3563 } 3564 3565 return NewID; 3566} 3567 3568void Sema::ActOnFields(Scope* S, 3569 SourceLocation RecLoc, DeclTy *RecDecl, 3570 DeclTy **Fields, unsigned NumFields, 3571 SourceLocation LBrac, SourceLocation RBrac, 3572 AttributeList *Attr) { 3573 Decl *EnclosingDecl = static_cast<Decl*>(RecDecl); 3574 assert(EnclosingDecl && "missing record or interface decl"); 3575 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 3576 3577 // Verify that all the fields are okay. 3578 unsigned NumNamedMembers = 0; 3579 llvm::SmallVector<FieldDecl*, 32> RecFields; 3580 3581 for (unsigned i = 0; i != NumFields; ++i) { 3582 FieldDecl *FD = cast_or_null<FieldDecl>(static_cast<Decl*>(Fields[i])); 3583 assert(FD && "missing field decl"); 3584 3585 // Get the type for the field. 3586 Type *FDTy = FD->getType().getTypePtr(); 3587 3588 if (!FD->isAnonymousStructOrUnion()) { 3589 // Remember all fields written by the user. 3590 RecFields.push_back(FD); 3591 } 3592 3593 // C99 6.7.2.1p2 - A field may not be a function type. 3594 if (FDTy->isFunctionType()) { 3595 Diag(FD->getLocation(), diag::err_field_declared_as_function) 3596 << FD->getDeclName(); 3597 FD->setInvalidDecl(); 3598 EnclosingDecl->setInvalidDecl(); 3599 continue; 3600 } 3601 // C99 6.7.2.1p2 - A field may not be an incomplete type except... 3602 if (FDTy->isIncompleteType()) { 3603 if (!Record) { // Incomplete ivar type is always an error. 3604 DiagnoseIncompleteType(FD->getLocation(), FD->getType(), 3605 diag::err_field_incomplete); 3606 FD->setInvalidDecl(); 3607 EnclosingDecl->setInvalidDecl(); 3608 continue; 3609 } 3610 if (i != NumFields-1 || // ... that the last member ... 3611 !Record->isStruct() || // ... of a structure ... 3612 !FDTy->isArrayType()) { //... may have incomplete array type. 3613 DiagnoseIncompleteType(FD->getLocation(), FD->getType(), 3614 diag::err_field_incomplete); 3615 FD->setInvalidDecl(); 3616 EnclosingDecl->setInvalidDecl(); 3617 continue; 3618 } 3619 if (NumNamedMembers < 1) { //... must have more than named member ... 3620 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 3621 << FD->getDeclName(); 3622 FD->setInvalidDecl(); 3623 EnclosingDecl->setInvalidDecl(); 3624 continue; 3625 } 3626 // Okay, we have a legal flexible array member at the end of the struct. 3627 if (Record) 3628 Record->setHasFlexibleArrayMember(true); 3629 } 3630 /// C99 6.7.2.1p2 - a struct ending in a flexible array member cannot be the 3631 /// field of another structure or the element of an array. 3632 if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 3633 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 3634 // If this is a member of a union, then entire union becomes "flexible". 3635 if (Record && Record->isUnion()) { 3636 Record->setHasFlexibleArrayMember(true); 3637 } else { 3638 // If this is a struct/class and this is not the last element, reject 3639 // it. Note that GCC supports variable sized arrays in the middle of 3640 // structures. 3641 if (i != NumFields-1) { 3642 Diag(FD->getLocation(), diag::err_variable_sized_type_in_struct) 3643 << FD->getDeclName(); 3644 FD->setInvalidDecl(); 3645 EnclosingDecl->setInvalidDecl(); 3646 continue; 3647 } 3648 // We support flexible arrays at the end of structs in other structs 3649 // as an extension. 3650 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 3651 << FD->getDeclName(); 3652 if (Record) 3653 Record->setHasFlexibleArrayMember(true); 3654 } 3655 } 3656 } 3657 /// A field cannot be an Objective-c object 3658 if (FDTy->isObjCInterfaceType()) { 3659 Diag(FD->getLocation(), diag::err_statically_allocated_object) 3660 << FD->getDeclName(); 3661 FD->setInvalidDecl(); 3662 EnclosingDecl->setInvalidDecl(); 3663 continue; 3664 } 3665 // Keep track of the number of named members. 3666 if (FD->getIdentifier()) 3667 ++NumNamedMembers; 3668 } 3669 3670 // Okay, we successfully defined 'Record'. 3671 if (Record) { 3672 Record->completeDefinition(Context); 3673 } else { 3674 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 3675 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 3676 ID->addInstanceVariablesToClass(ClsFields, RecFields.size(), RBrac); 3677 // Must enforce the rule that ivars in the base classes may not be 3678 // duplicates. 3679 if (ID->getSuperClass()) { 3680 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 3681 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 3682 ObjCIvarDecl* Ivar = (*IVI); 3683 IdentifierInfo *II = Ivar->getIdentifier(); 3684 ObjCIvarDecl* prevIvar = ID->getSuperClass()->lookupInstanceVariable(II); 3685 if (prevIvar) { 3686 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 3687 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 3688 } 3689 } 3690 } 3691 } 3692 else if (ObjCImplementationDecl *IMPDecl = 3693 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 3694 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 3695 IMPDecl->ObjCAddInstanceVariablesToClassImpl(ClsFields, RecFields.size()); 3696 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 3697 } 3698 } 3699 3700 if (Attr) 3701 ProcessDeclAttributeList(Record, Attr); 3702} 3703 3704Sema::DeclTy *Sema::ActOnEnumConstant(Scope *S, DeclTy *theEnumDecl, 3705 DeclTy *lastEnumConst, 3706 SourceLocation IdLoc, IdentifierInfo *Id, 3707 SourceLocation EqualLoc, ExprTy *val) { 3708 EnumDecl *TheEnumDecl = cast<EnumDecl>(static_cast<Decl*>(theEnumDecl)); 3709 EnumConstantDecl *LastEnumConst = 3710 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(lastEnumConst)); 3711 Expr *Val = static_cast<Expr*>(val); 3712 3713 // The scope passed in may not be a decl scope. Zip up the scope tree until 3714 // we find one that is. 3715 S = getNonFieldDeclScope(S); 3716 3717 // Verify that there isn't already something declared with this name in this 3718 // scope. 3719 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 3720 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3721 // Maybe we will complain about the shadowed template parameter. 3722 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 3723 // Just pretend that we didn't see the previous declaration. 3724 PrevDecl = 0; 3725 } 3726 3727 if (PrevDecl) { 3728 // When in C++, we may get a TagDecl with the same name; in this case the 3729 // enum constant will 'hide' the tag. 3730 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 3731 "Received TagDecl when not in C++!"); 3732 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 3733 if (isa<EnumConstantDecl>(PrevDecl)) 3734 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 3735 else 3736 Diag(IdLoc, diag::err_redefinition) << Id; 3737 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3738 Val->Destroy(Context); 3739 return 0; 3740 } 3741 } 3742 3743 llvm::APSInt EnumVal(32); 3744 QualType EltTy; 3745 if (Val) { 3746 // Make sure to promote the operand type to int. 3747 UsualUnaryConversions(Val); 3748 3749 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 3750 SourceLocation ExpLoc; 3751 if (VerifyIntegerConstantExpression(Val, &EnumVal)) { 3752 Val->Destroy(Context); 3753 Val = 0; // Just forget about it. 3754 } else { 3755 EltTy = Val->getType(); 3756 } 3757 } 3758 3759 if (!Val) { 3760 if (LastEnumConst) { 3761 // Assign the last value + 1. 3762 EnumVal = LastEnumConst->getInitVal(); 3763 ++EnumVal; 3764 3765 // Check for overflow on increment. 3766 if (EnumVal < LastEnumConst->getInitVal()) 3767 Diag(IdLoc, diag::warn_enum_value_overflow); 3768 3769 EltTy = LastEnumConst->getType(); 3770 } else { 3771 // First value, set to zero. 3772 EltTy = Context.IntTy; 3773 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 3774 } 3775 } 3776 3777 EnumConstantDecl *New = 3778 EnumConstantDecl::Create(Context, TheEnumDecl, IdLoc, Id, EltTy, 3779 Val, EnumVal); 3780 3781 // Register this decl in the current scope stack. 3782 PushOnScopeChains(New, S); 3783 3784 return New; 3785} 3786 3787// FIXME: For consistency with ActOnFields(), we should have the parser 3788// pass in the source location for the left/right braces. 3789void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclTy *EnumDeclX, 3790 DeclTy **Elements, unsigned NumElements) { 3791 EnumDecl *Enum = cast<EnumDecl>(static_cast<Decl*>(EnumDeclX)); 3792 QualType EnumType = Context.getTypeDeclType(Enum); 3793 3794 // TODO: If the result value doesn't fit in an int, it must be a long or long 3795 // long value. ISO C does not support this, but GCC does as an extension, 3796 // emit a warning. 3797 unsigned IntWidth = Context.Target.getIntWidth(); 3798 3799 // Verify that all the values are okay, compute the size of the values, and 3800 // reverse the list. 3801 unsigned NumNegativeBits = 0; 3802 unsigned NumPositiveBits = 0; 3803 3804 // Keep track of whether all elements have type int. 3805 bool AllElementsInt = true; 3806 3807 for (unsigned i = 0; i != NumElements; ++i) { 3808 EnumConstantDecl *ECD = 3809 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3810 if (!ECD) continue; // Already issued a diagnostic. 3811 3812 // If the enum value doesn't fit in an int, emit an extension warning. 3813 const llvm::APSInt &InitVal = ECD->getInitVal(); 3814 assert(InitVal.getBitWidth() >= IntWidth && 3815 "Should have promoted value to int"); 3816 if (InitVal.getBitWidth() > IntWidth) { 3817 llvm::APSInt V(InitVal); 3818 V.trunc(IntWidth); 3819 V.extend(InitVal.getBitWidth()); 3820 if (V != InitVal) 3821 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 3822 << InitVal.toString(10); 3823 } 3824 3825 // Keep track of the size of positive and negative values. 3826 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 3827 NumPositiveBits = std::max(NumPositiveBits, 3828 (unsigned)InitVal.getActiveBits()); 3829 else 3830 NumNegativeBits = std::max(NumNegativeBits, 3831 (unsigned)InitVal.getMinSignedBits()); 3832 3833 // Keep track of whether every enum element has type int (very commmon). 3834 if (AllElementsInt) 3835 AllElementsInt = ECD->getType() == Context.IntTy; 3836 } 3837 3838 // Figure out the type that should be used for this enum. 3839 // FIXME: Support attribute(packed) on enums and -fshort-enums. 3840 QualType BestType; 3841 unsigned BestWidth; 3842 3843 if (NumNegativeBits) { 3844 // If there is a negative value, figure out the smallest integer type (of 3845 // int/long/longlong) that fits. 3846 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 3847 BestType = Context.IntTy; 3848 BestWidth = IntWidth; 3849 } else { 3850 BestWidth = Context.Target.getLongWidth(); 3851 3852 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 3853 BestType = Context.LongTy; 3854 else { 3855 BestWidth = Context.Target.getLongLongWidth(); 3856 3857 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 3858 Diag(Enum->getLocation(), diag::warn_enum_too_large); 3859 BestType = Context.LongLongTy; 3860 } 3861 } 3862 } else { 3863 // If there is no negative value, figure out which of uint, ulong, ulonglong 3864 // fits. 3865 if (NumPositiveBits <= IntWidth) { 3866 BestType = Context.UnsignedIntTy; 3867 BestWidth = IntWidth; 3868 } else if (NumPositiveBits <= 3869 (BestWidth = Context.Target.getLongWidth())) { 3870 BestType = Context.UnsignedLongTy; 3871 } else { 3872 BestWidth = Context.Target.getLongLongWidth(); 3873 assert(NumPositiveBits <= BestWidth && 3874 "How could an initializer get larger than ULL?"); 3875 BestType = Context.UnsignedLongLongTy; 3876 } 3877 } 3878 3879 // Loop over all of the enumerator constants, changing their types to match 3880 // the type of the enum if needed. 3881 for (unsigned i = 0; i != NumElements; ++i) { 3882 EnumConstantDecl *ECD = 3883 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3884 if (!ECD) continue; // Already issued a diagnostic. 3885 3886 // Standard C says the enumerators have int type, but we allow, as an 3887 // extension, the enumerators to be larger than int size. If each 3888 // enumerator value fits in an int, type it as an int, otherwise type it the 3889 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 3890 // that X has type 'int', not 'unsigned'. 3891 if (ECD->getType() == Context.IntTy) { 3892 // Make sure the init value is signed. 3893 llvm::APSInt IV = ECD->getInitVal(); 3894 IV.setIsSigned(true); 3895 ECD->setInitVal(IV); 3896 3897 if (getLangOptions().CPlusPlus) 3898 // C++ [dcl.enum]p4: Following the closing brace of an 3899 // enum-specifier, each enumerator has the type of its 3900 // enumeration. 3901 ECD->setType(EnumType); 3902 continue; // Already int type. 3903 } 3904 3905 // Determine whether the value fits into an int. 3906 llvm::APSInt InitVal = ECD->getInitVal(); 3907 bool FitsInInt; 3908 if (InitVal.isUnsigned() || !InitVal.isNegative()) 3909 FitsInInt = InitVal.getActiveBits() < IntWidth; 3910 else 3911 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 3912 3913 // If it fits into an integer type, force it. Otherwise force it to match 3914 // the enum decl type. 3915 QualType NewTy; 3916 unsigned NewWidth; 3917 bool NewSign; 3918 if (FitsInInt) { 3919 NewTy = Context.IntTy; 3920 NewWidth = IntWidth; 3921 NewSign = true; 3922 } else if (ECD->getType() == BestType) { 3923 // Already the right type! 3924 if (getLangOptions().CPlusPlus) 3925 // C++ [dcl.enum]p4: Following the closing brace of an 3926 // enum-specifier, each enumerator has the type of its 3927 // enumeration. 3928 ECD->setType(EnumType); 3929 continue; 3930 } else { 3931 NewTy = BestType; 3932 NewWidth = BestWidth; 3933 NewSign = BestType->isSignedIntegerType(); 3934 } 3935 3936 // Adjust the APSInt value. 3937 InitVal.extOrTrunc(NewWidth); 3938 InitVal.setIsSigned(NewSign); 3939 ECD->setInitVal(InitVal); 3940 3941 // Adjust the Expr initializer and type. 3942 if (ECD->getInitExpr()) 3943 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), 3944 /*isLvalue=*/false)); 3945 if (getLangOptions().CPlusPlus) 3946 // C++ [dcl.enum]p4: Following the closing brace of an 3947 // enum-specifier, each enumerator has the type of its 3948 // enumeration. 3949 ECD->setType(EnumType); 3950 else 3951 ECD->setType(NewTy); 3952 } 3953 3954 Enum->completeDefinition(Context, BestType); 3955} 3956 3957Sema::DeclTy *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 3958 ExprArg expr) { 3959 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr.release()); 3960 3961 return FileScopeAsmDecl::Create(Context, CurContext, Loc, AsmString); 3962} 3963 3964 3965void Sema::ActOnPragmaPack(PragmaPackKind Kind, IdentifierInfo *Name, 3966 ExprTy *alignment, SourceLocation PragmaLoc, 3967 SourceLocation LParenLoc, SourceLocation RParenLoc) { 3968 Expr *Alignment = static_cast<Expr *>(alignment); 3969 3970 // If specified then alignment must be a "small" power of two. 3971 unsigned AlignmentVal = 0; 3972 if (Alignment) { 3973 llvm::APSInt Val; 3974 if (!Alignment->isIntegerConstantExpr(Val, Context) || 3975 !Val.isPowerOf2() || 3976 Val.getZExtValue() > 16) { 3977 Diag(PragmaLoc, diag::warn_pragma_pack_invalid_alignment); 3978 Alignment->Destroy(Context); 3979 return; // Ignore 3980 } 3981 3982 AlignmentVal = (unsigned) Val.getZExtValue(); 3983 } 3984 3985 switch (Kind) { 3986 case Action::PPK_Default: // pack([n]) 3987 PackContext.setAlignment(AlignmentVal); 3988 break; 3989 3990 case Action::PPK_Show: // pack(show) 3991 // Show the current alignment, making sure to show the right value 3992 // for the default. 3993 AlignmentVal = PackContext.getAlignment(); 3994 // FIXME: This should come from the target. 3995 if (AlignmentVal == 0) 3996 AlignmentVal = 8; 3997 Diag(PragmaLoc, diag::warn_pragma_pack_show) << AlignmentVal; 3998 break; 3999 4000 case Action::PPK_Push: // pack(push [, id] [, [n]) 4001 PackContext.push(Name); 4002 // Set the new alignment if specified. 4003 if (Alignment) 4004 PackContext.setAlignment(AlignmentVal); 4005 break; 4006 4007 case Action::PPK_Pop: // pack(pop [, id] [, n]) 4008 // MSDN, C/C++ Preprocessor Reference > Pragma Directives > pack: 4009 // "#pragma pack(pop, identifier, n) is undefined" 4010 if (Alignment && Name) 4011 Diag(PragmaLoc, diag::warn_pragma_pack_pop_identifer_and_alignment); 4012 4013 // Do the pop. 4014 if (!PackContext.pop(Name)) { 4015 // If a name was specified then failure indicates the name 4016 // wasn't found. Otherwise failure indicates the stack was 4017 // empty. 4018 Diag(PragmaLoc, diag::warn_pragma_pack_pop_failed) 4019 << (Name ? "no record matching name" : "stack empty"); 4020 4021 // FIXME: Warn about popping named records as MSVC does. 4022 } else { 4023 // Pop succeeded, set the new alignment if specified. 4024 if (Alignment) 4025 PackContext.setAlignment(AlignmentVal); 4026 } 4027 break; 4028 4029 default: 4030 assert(0 && "Invalid #pragma pack kind."); 4031 } 4032} 4033 4034bool PragmaPackStack::pop(IdentifierInfo *Name) { 4035 if (Stack.empty()) 4036 return false; 4037 4038 // If name is empty just pop top. 4039 if (!Name) { 4040 Alignment = Stack.back().first; 4041 Stack.pop_back(); 4042 return true; 4043 } 4044 4045 // Otherwise, find the named record. 4046 for (unsigned i = Stack.size(); i != 0; ) { 4047 --i; 4048 if (Stack[i].second == Name) { 4049 // Found it, pop up to and including this record. 4050 Alignment = Stack[i].first; 4051 Stack.erase(Stack.begin() + i, Stack.end()); 4052 return true; 4053 } 4054 } 4055 4056 return false; 4057} 4058