SemaDecl.cpp revision f7306d7435ca4f99ccf262abbb8ec93479bb778e
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInherit.h" 16#include "clang/AST/APValue.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/Analysis/CFG.h" 20#include "clang/AST/DeclObjC.h" 21#include "clang/AST/DeclTemplate.h" 22#include "clang/AST/ExprCXX.h" 23#include "clang/AST/StmtCXX.h" 24#include "clang/AST/StmtObjC.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Basic/PartialDiagnostic.h" 27#include "clang/Basic/SourceManager.h" 28#include "clang/Basic/TargetInfo.h" 29// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 30#include "clang/Lex/Preprocessor.h" 31#include "clang/Lex/HeaderSearch.h" 32#include "llvm/ADT/BitVector.h" 33#include "llvm/ADT/STLExtras.h" 34#include <algorithm> 35#include <functional> 36#include <queue> 37using namespace clang; 38 39/// getDeclName - Return a pretty name for the specified decl if possible, or 40/// an empty string if not. This is used for pretty crash reporting. 41std::string Sema::getDeclName(DeclPtrTy d) { 42 Decl *D = d.getAs<Decl>(); 43 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 44 return DN->getQualifiedNameAsString(); 45 return ""; 46} 47 48Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) { 49 return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>())); 50} 51 52/// \brief If the identifier refers to a type name within this scope, 53/// return the declaration of that type. 54/// 55/// This routine performs ordinary name lookup of the identifier II 56/// within the given scope, with optional C++ scope specifier SS, to 57/// determine whether the name refers to a type. If so, returns an 58/// opaque pointer (actually a QualType) corresponding to that 59/// type. Otherwise, returns NULL. 60/// 61/// If name lookup results in an ambiguity, this routine will complain 62/// and then return NULL. 63Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 64 Scope *S, const CXXScopeSpec *SS, 65 bool isClassName) { 66 // C++ [temp.res]p3: 67 // A qualified-id that refers to a type and in which the 68 // nested-name-specifier depends on a template-parameter (14.6.2) 69 // shall be prefixed by the keyword typename to indicate that the 70 // qualified-id denotes a type, forming an 71 // elaborated-type-specifier (7.1.5.3). 72 // 73 // We therefore do not perform any name lookup if the result would 74 // refer to a member of an unknown specialization. 75 if (SS && isUnknownSpecialization(*SS)) { 76 if (!isClassName) 77 return 0; 78 79 // We know from the grammar that this name refers to a type, so build a 80 // TypenameType node to describe the type. 81 // FIXME: Record somewhere that this TypenameType node has no "typename" 82 // keyword associated with it. 83 return CheckTypenameType((NestedNameSpecifier *)SS->getScopeRep(), 84 II, SS->getRange()).getAsOpaquePtr(); 85 } 86 87 LookupResult Result 88 = LookupParsedName(S, SS, &II, LookupOrdinaryName, false, false); 89 90 NamedDecl *IIDecl = 0; 91 switch (Result.getKind()) { 92 case LookupResult::NotFound: 93 case LookupResult::FoundOverloaded: 94 return 0; 95 96 case LookupResult::AmbiguousBaseSubobjectTypes: 97 case LookupResult::AmbiguousBaseSubobjects: 98 case LookupResult::AmbiguousReference: { 99 // Look to see if we have a type anywhere in the list of results. 100 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 101 Res != ResEnd; ++Res) { 102 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 103 if (!IIDecl || 104 (*Res)->getLocation().getRawEncoding() < 105 IIDecl->getLocation().getRawEncoding()) 106 IIDecl = *Res; 107 } 108 } 109 110 if (!IIDecl) { 111 // None of the entities we found is a type, so there is no way 112 // to even assume that the result is a type. In this case, don't 113 // complain about the ambiguity. The parser will either try to 114 // perform this lookup again (e.g., as an object name), which 115 // will produce the ambiguity, or will complain that it expected 116 // a type name. 117 Result.Destroy(); 118 return 0; 119 } 120 121 // We found a type within the ambiguous lookup; diagnose the 122 // ambiguity and then return that type. This might be the right 123 // answer, or it might not be, but it suppresses any attempt to 124 // perform the name lookup again. 125 DiagnoseAmbiguousLookup(Result, DeclarationName(&II), NameLoc); 126 break; 127 } 128 129 case LookupResult::Found: 130 IIDecl = Result.getAsDecl(); 131 break; 132 } 133 134 if (IIDecl) { 135 QualType T; 136 137 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 138 // Check whether we can use this type 139 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 140 141 if (getLangOptions().CPlusPlus) { 142 // C++ [temp.local]p2: 143 // Within the scope of a class template specialization or 144 // partial specialization, when the injected-class-name is 145 // not followed by a <, it is equivalent to the 146 // injected-class-name followed by the template-argument s 147 // of the class template specialization or partial 148 // specialization enclosed in <>. 149 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) 150 if (RD->isInjectedClassName()) 151 if (ClassTemplateDecl *Template = RD->getDescribedClassTemplate()) 152 T = Template->getInjectedClassNameType(Context); 153 } 154 155 if (T.isNull()) 156 T = Context.getTypeDeclType(TD); 157 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 158 // Check whether we can use this interface. 159 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 160 161 T = Context.getObjCInterfaceType(IDecl); 162 } else 163 return 0; 164 165 if (SS) 166 T = getQualifiedNameType(*SS, T); 167 168 return T.getAsOpaquePtr(); 169 } 170 171 return 0; 172} 173 174/// isTagName() - This method is called *for error recovery purposes only* 175/// to determine if the specified name is a valid tag name ("struct foo"). If 176/// so, this returns the TST for the tag corresponding to it (TST_enum, 177/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 178/// where the user forgot to specify the tag. 179DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 180 // Do a tag name lookup in this scope. 181 LookupResult R = LookupName(S, &II, LookupTagName, false, false); 182 if (R.getKind() == LookupResult::Found) 183 if (const TagDecl *TD = dyn_cast<TagDecl>(R.getAsDecl())) { 184 switch (TD->getTagKind()) { 185 case TagDecl::TK_struct: return DeclSpec::TST_struct; 186 case TagDecl::TK_union: return DeclSpec::TST_union; 187 case TagDecl::TK_class: return DeclSpec::TST_class; 188 case TagDecl::TK_enum: return DeclSpec::TST_enum; 189 } 190 } 191 192 return DeclSpec::TST_unspecified; 193} 194 195 196// Determines the context to return to after temporarily entering a 197// context. This depends in an unnecessarily complicated way on the 198// exact ordering of callbacks from the parser. 199DeclContext *Sema::getContainingDC(DeclContext *DC) { 200 201 // Functions defined inline within classes aren't parsed until we've 202 // finished parsing the top-level class, so the top-level class is 203 // the context we'll need to return to. 204 if (isa<FunctionDecl>(DC)) { 205 DC = DC->getLexicalParent(); 206 207 // A function not defined within a class will always return to its 208 // lexical context. 209 if (!isa<CXXRecordDecl>(DC)) 210 return DC; 211 212 // A C++ inline method/friend is parsed *after* the topmost class 213 // it was declared in is fully parsed ("complete"); the topmost 214 // class is the context we need to return to. 215 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 216 DC = RD; 217 218 // Return the declaration context of the topmost class the inline method is 219 // declared in. 220 return DC; 221 } 222 223 if (isa<ObjCMethodDecl>(DC)) 224 return Context.getTranslationUnitDecl(); 225 226 return DC->getLexicalParent(); 227} 228 229void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 230 assert(getContainingDC(DC) == CurContext && 231 "The next DeclContext should be lexically contained in the current one."); 232 CurContext = DC; 233 S->setEntity(DC); 234} 235 236void Sema::PopDeclContext() { 237 assert(CurContext && "DeclContext imbalance!"); 238 239 CurContext = getContainingDC(CurContext); 240} 241 242/// EnterDeclaratorContext - Used when we must lookup names in the context 243/// of a declarator's nested name specifier. 244void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 245 assert(PreDeclaratorDC == 0 && "Previous declarator context not popped?"); 246 PreDeclaratorDC = static_cast<DeclContext*>(S->getEntity()); 247 CurContext = DC; 248 assert(CurContext && "No context?"); 249 S->setEntity(CurContext); 250} 251 252void Sema::ExitDeclaratorContext(Scope *S) { 253 S->setEntity(PreDeclaratorDC); 254 PreDeclaratorDC = 0; 255 256 // Reset CurContext to the nearest enclosing context. 257 while (!S->getEntity() && S->getParent()) 258 S = S->getParent(); 259 CurContext = static_cast<DeclContext*>(S->getEntity()); 260 assert(CurContext && "No context?"); 261} 262 263/// \brief Determine whether we allow overloading of the function 264/// PrevDecl with another declaration. 265/// 266/// This routine determines whether overloading is possible, not 267/// whether some new function is actually an overload. It will return 268/// true in C++ (where we can always provide overloads) or, as an 269/// extension, in C when the previous function is already an 270/// overloaded function declaration or has the "overloadable" 271/// attribute. 272static bool AllowOverloadingOfFunction(Decl *PrevDecl, ASTContext &Context) { 273 if (Context.getLangOptions().CPlusPlus) 274 return true; 275 276 if (isa<OverloadedFunctionDecl>(PrevDecl)) 277 return true; 278 279 return PrevDecl->getAttr<OverloadableAttr>() != 0; 280} 281 282/// Add this decl to the scope shadowed decl chains. 283void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 284 // Move up the scope chain until we find the nearest enclosing 285 // non-transparent context. The declaration will be introduced into this 286 // scope. 287 while (S->getEntity() && 288 ((DeclContext *)S->getEntity())->isTransparentContext()) 289 S = S->getParent(); 290 291 // Add scoped declarations into their context, so that they can be 292 // found later. Declarations without a context won't be inserted 293 // into any context. 294 if (AddToContext) 295 CurContext->addDecl(D); 296 297 // Out-of-line function and variable definitions should not be pushed into 298 // scope. 299 if ((isa<FunctionTemplateDecl>(D) && 300 cast<FunctionTemplateDecl>(D)->getTemplatedDecl()->isOutOfLine()) || 301 (isa<FunctionDecl>(D) && cast<FunctionDecl>(D)->isOutOfLine()) || 302 (isa<VarDecl>(D) && cast<VarDecl>(D)->isOutOfLine())) 303 return; 304 305 S->AddDecl(DeclPtrTy::make(D)); 306 307 // C++ [basic.scope]p4: 308 // -- exactly one declaration shall declare a class name or 309 // enumeration name that is not a typedef name and the other 310 // declarations shall all refer to the same object or 311 // enumerator, or all refer to functions and function templates; 312 // in this case the class name or enumeration name is hidden. 313 if (TagDecl *TD = dyn_cast<TagDecl>(D)) { 314 // We are pushing the name of a tag (enum or class). 315 if (CurContext->getLookupContext() 316 == TD->getDeclContext()->getLookupContext()) { 317 // We're pushing the tag into the current context, which might 318 // require some reshuffling in the identifier resolver. 319 IdentifierResolver::iterator 320 I = IdResolver.begin(TD->getDeclName()), 321 IEnd = IdResolver.end(); 322 NamedDecl *ID = *I; 323 if (I != IEnd && isDeclInScope(ID, CurContext, S)) { 324 NamedDecl *PrevDecl = *I; 325 for (; I != IEnd && isDeclInScope(ID, CurContext, S); 326 PrevDecl = *I, ++I) { 327 if (TD->declarationReplaces(*I)) { 328 // This is a redeclaration. Remove it from the chain and 329 // break out, so that we'll add in the shadowed 330 // declaration. 331 S->RemoveDecl(DeclPtrTy::make(*I)); 332 if (PrevDecl == *I) { 333 IdResolver.RemoveDecl(*I); 334 IdResolver.AddDecl(TD); 335 return; 336 } else { 337 IdResolver.RemoveDecl(*I); 338 break; 339 } 340 } 341 } 342 343 // There is already a declaration with the same name in the same 344 // scope, which is not a tag declaration. It must be found 345 // before we find the new declaration, so insert the new 346 // declaration at the end of the chain. 347 IdResolver.AddShadowedDecl(TD, PrevDecl); 348 349 return; 350 } 351 } 352 } else if ((isa<FunctionDecl>(D) && 353 AllowOverloadingOfFunction(D, Context)) || 354 isa<FunctionTemplateDecl>(D)) { 355 // We are pushing the name of a function or function template, 356 // which might be an overloaded name. 357 IdentifierResolver::iterator Redecl 358 = std::find_if(IdResolver.begin(D->getDeclName()), 359 IdResolver.end(), 360 std::bind1st(std::mem_fun(&NamedDecl::declarationReplaces), 361 D)); 362 if (Redecl != IdResolver.end() && 363 S->isDeclScope(DeclPtrTy::make(*Redecl))) { 364 // There is already a declaration of a function on our 365 // IdResolver chain. Replace it with this declaration. 366 S->RemoveDecl(DeclPtrTy::make(*Redecl)); 367 IdResolver.RemoveDecl(*Redecl); 368 } 369 } else if (isa<ObjCInterfaceDecl>(D)) { 370 // We're pushing an Objective-C interface into the current 371 // context. If there is already an alias declaration, remove it first. 372 for (IdentifierResolver::iterator 373 I = IdResolver.begin(D->getDeclName()), IEnd = IdResolver.end(); 374 I != IEnd; ++I) { 375 if (isa<ObjCCompatibleAliasDecl>(*I)) { 376 S->RemoveDecl(DeclPtrTy::make(*I)); 377 IdResolver.RemoveDecl(*I); 378 break; 379 } 380 } 381 } 382 383 IdResolver.AddDecl(D); 384} 385 386bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) { 387 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) { 388 // Look inside the overload set to determine if any of the declarations 389 // are in scope. (Possibly) build a new overload set containing only 390 // those declarations that are in scope. 391 OverloadedFunctionDecl *NewOvl = 0; 392 bool FoundInScope = false; 393 for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), 394 FEnd = Ovl->function_end(); 395 F != FEnd; ++F) { 396 NamedDecl *FD = F->get(); 397 if (!isDeclInScope(FD, Ctx, S)) { 398 if (!NewOvl && F != Ovl->function_begin()) { 399 NewOvl = OverloadedFunctionDecl::Create(Context, 400 F->get()->getDeclContext(), 401 F->get()->getDeclName()); 402 D = NewOvl; 403 for (OverloadedFunctionDecl::function_iterator 404 First = Ovl->function_begin(); 405 First != F; ++First) 406 NewOvl->addOverload(*First); 407 } 408 } else { 409 FoundInScope = true; 410 if (NewOvl) 411 NewOvl->addOverload(*F); 412 } 413 } 414 415 return FoundInScope; 416 } 417 418 return IdResolver.isDeclInScope(D, Ctx, Context, S); 419} 420 421void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 422 if (S->decl_empty()) return; 423 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 424 "Scope shouldn't contain decls!"); 425 426 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 427 I != E; ++I) { 428 Decl *TmpD = (*I).getAs<Decl>(); 429 assert(TmpD && "This decl didn't get pushed??"); 430 431 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 432 NamedDecl *D = cast<NamedDecl>(TmpD); 433 434 if (!D->getDeclName()) continue; 435 436 // Remove this name from our lexical scope. 437 IdResolver.RemoveDecl(D); 438 } 439} 440 441/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 442/// return 0 if one not found. 443ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 444 // The third "scope" argument is 0 since we aren't enabling lazy built-in 445 // creation from this context. 446 NamedDecl *IDecl = LookupName(TUScope, Id, LookupOrdinaryName); 447 448 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 449} 450 451/// getNonFieldDeclScope - Retrieves the innermost scope, starting 452/// from S, where a non-field would be declared. This routine copes 453/// with the difference between C and C++ scoping rules in structs and 454/// unions. For example, the following code is well-formed in C but 455/// ill-formed in C++: 456/// @code 457/// struct S6 { 458/// enum { BAR } e; 459/// }; 460/// 461/// void test_S6() { 462/// struct S6 a; 463/// a.e = BAR; 464/// } 465/// @endcode 466/// For the declaration of BAR, this routine will return a different 467/// scope. The scope S will be the scope of the unnamed enumeration 468/// within S6. In C++, this routine will return the scope associated 469/// with S6, because the enumeration's scope is a transparent 470/// context but structures can contain non-field names. In C, this 471/// routine will return the translation unit scope, since the 472/// enumeration's scope is a transparent context and structures cannot 473/// contain non-field names. 474Scope *Sema::getNonFieldDeclScope(Scope *S) { 475 while (((S->getFlags() & Scope::DeclScope) == 0) || 476 (S->getEntity() && 477 ((DeclContext *)S->getEntity())->isTransparentContext()) || 478 (S->isClassScope() && !getLangOptions().CPlusPlus)) 479 S = S->getParent(); 480 return S; 481} 482 483void Sema::InitBuiltinVaListType() { 484 if (!Context.getBuiltinVaListType().isNull()) 485 return; 486 487 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 488 NamedDecl *VaDecl = LookupName(TUScope, VaIdent, LookupOrdinaryName); 489 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 490 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 491} 492 493/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 494/// file scope. lazily create a decl for it. ForRedeclaration is true 495/// if we're creating this built-in in anticipation of redeclaring the 496/// built-in. 497NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 498 Scope *S, bool ForRedeclaration, 499 SourceLocation Loc) { 500 Builtin::ID BID = (Builtin::ID)bid; 501 502 if (Context.BuiltinInfo.hasVAListUse(BID)) 503 InitBuiltinVaListType(); 504 505 ASTContext::GetBuiltinTypeError Error; 506 QualType R = Context.GetBuiltinType(BID, Error); 507 switch (Error) { 508 case ASTContext::GE_None: 509 // Okay 510 break; 511 512 case ASTContext::GE_Missing_stdio: 513 if (ForRedeclaration) 514 Diag(Loc, diag::err_implicit_decl_requires_stdio) 515 << Context.BuiltinInfo.GetName(BID); 516 return 0; 517 518 case ASTContext::GE_Missing_setjmp: 519 if (ForRedeclaration) 520 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 521 << Context.BuiltinInfo.GetName(BID); 522 return 0; 523 } 524 525 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 526 Diag(Loc, diag::ext_implicit_lib_function_decl) 527 << Context.BuiltinInfo.GetName(BID) 528 << R; 529 if (Context.BuiltinInfo.getHeaderName(BID) && 530 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 531 != Diagnostic::Ignored) 532 Diag(Loc, diag::note_please_include_header) 533 << Context.BuiltinInfo.getHeaderName(BID) 534 << Context.BuiltinInfo.GetName(BID); 535 } 536 537 FunctionDecl *New = FunctionDecl::Create(Context, 538 Context.getTranslationUnitDecl(), 539 Loc, II, R, /*DInfo=*/0, 540 FunctionDecl::Extern, false, 541 /*hasPrototype=*/true); 542 New->setImplicit(); 543 544 // Create Decl objects for each parameter, adding them to the 545 // FunctionDecl. 546 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 547 llvm::SmallVector<ParmVarDecl*, 16> Params; 548 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 549 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 550 FT->getArgType(i), /*DInfo=*/0, 551 VarDecl::None, 0)); 552 New->setParams(Context, Params.data(), Params.size()); 553 } 554 555 AddKnownFunctionAttributes(New); 556 557 // TUScope is the translation-unit scope to insert this function into. 558 // FIXME: This is hideous. We need to teach PushOnScopeChains to 559 // relate Scopes to DeclContexts, and probably eliminate CurContext 560 // entirely, but we're not there yet. 561 DeclContext *SavedContext = CurContext; 562 CurContext = Context.getTranslationUnitDecl(); 563 PushOnScopeChains(New, TUScope); 564 CurContext = SavedContext; 565 return New; 566} 567 568/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 569/// same name and scope as a previous declaration 'Old'. Figure out 570/// how to resolve this situation, merging decls or emitting 571/// diagnostics as appropriate. If there was an error, set New to be invalid. 572/// 573void Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 574 // If either decl is known invalid already, set the new one to be invalid and 575 // don't bother doing any merging checks. 576 if (New->isInvalidDecl() || OldD->isInvalidDecl()) 577 return New->setInvalidDecl(); 578 579 // Allow multiple definitions for ObjC built-in typedefs. 580 // FIXME: Verify the underlying types are equivalent! 581 if (getLangOptions().ObjC1) { 582 const IdentifierInfo *TypeID = New->getIdentifier(); 583 switch (TypeID->getLength()) { 584 default: break; 585 case 2: 586 if (!TypeID->isStr("id")) 587 break; 588 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 589 // Install the built-in type for 'id', ignoring the current definition. 590 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 591 return; 592 case 5: 593 if (!TypeID->isStr("Class")) 594 break; 595 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 596 // Install the built-in type for 'Class', ignoring the current definition. 597 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 598 return; 599 case 3: 600 if (!TypeID->isStr("SEL")) 601 break; 602 Context.setObjCSelType(Context.getTypeDeclType(New)); 603 return; 604 case 8: 605 if (!TypeID->isStr("Protocol")) 606 break; 607 Context.setObjCProtoType(New->getUnderlyingType()); 608 return; 609 } 610 // Fall through - the typedef name was not a builtin type. 611 } 612 // Verify the old decl was also a type. 613 TypeDecl *Old = dyn_cast<TypeDecl>(OldD); 614 if (!Old) { 615 Diag(New->getLocation(), diag::err_redefinition_different_kind) 616 << New->getDeclName(); 617 if (OldD->getLocation().isValid()) 618 Diag(OldD->getLocation(), diag::note_previous_definition); 619 return New->setInvalidDecl(); 620 } 621 622 // Determine the "old" type we'll use for checking and diagnostics. 623 QualType OldType; 624 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 625 OldType = OldTypedef->getUnderlyingType(); 626 else 627 OldType = Context.getTypeDeclType(Old); 628 629 // If the typedef types are not identical, reject them in all languages and 630 // with any extensions enabled. 631 632 if (OldType != New->getUnderlyingType() && 633 Context.getCanonicalType(OldType) != 634 Context.getCanonicalType(New->getUnderlyingType())) { 635 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 636 << New->getUnderlyingType() << OldType; 637 if (Old->getLocation().isValid()) 638 Diag(Old->getLocation(), diag::note_previous_definition); 639 return New->setInvalidDecl(); 640 } 641 642 if (getLangOptions().Microsoft) 643 return; 644 645 // C++ [dcl.typedef]p2: 646 // In a given non-class scope, a typedef specifier can be used to 647 // redefine the name of any type declared in that scope to refer 648 // to the type to which it already refers. 649 if (getLangOptions().CPlusPlus) { 650 if (!isa<CXXRecordDecl>(CurContext)) 651 return; 652 Diag(New->getLocation(), diag::err_redefinition) 653 << New->getDeclName(); 654 Diag(Old->getLocation(), diag::note_previous_definition); 655 return New->setInvalidDecl(); 656 } 657 658 // If we have a redefinition of a typedef in C, emit a warning. This warning 659 // is normally mapped to an error, but can be controlled with 660 // -Wtypedef-redefinition. If either the original or the redefinition is 661 // in a system header, don't emit this for compatibility with GCC. 662 if (PP.getDiagnostics().getSuppressSystemWarnings() && 663 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 664 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 665 return; 666 667 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 668 << New->getDeclName(); 669 Diag(Old->getLocation(), diag::note_previous_definition); 670 return; 671} 672 673/// DeclhasAttr - returns true if decl Declaration already has the target 674/// attribute. 675static bool 676DeclHasAttr(const Decl *decl, const Attr *target) { 677 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 678 if (attr->getKind() == target->getKind()) 679 return true; 680 681 return false; 682} 683 684/// MergeAttributes - append attributes from the Old decl to the New one. 685static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 686 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 687 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 688 Attr *NewAttr = attr->clone(C); 689 NewAttr->setInherited(true); 690 New->addAttr(NewAttr); 691 } 692 } 693} 694 695/// Used in MergeFunctionDecl to keep track of function parameters in 696/// C. 697struct GNUCompatibleParamWarning { 698 ParmVarDecl *OldParm; 699 ParmVarDecl *NewParm; 700 QualType PromotedType; 701}; 702 703/// MergeFunctionDecl - We just parsed a function 'New' from 704/// declarator D which has the same name and scope as a previous 705/// declaration 'Old'. Figure out how to resolve this situation, 706/// merging decls or emitting diagnostics as appropriate. 707/// 708/// In C++, New and Old must be declarations that are not 709/// overloaded. Use IsOverload to determine whether New and Old are 710/// overloaded, and to select the Old declaration that New should be 711/// merged with. 712/// 713/// Returns true if there was an error, false otherwise. 714bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 715 assert(!isa<OverloadedFunctionDecl>(OldD) && 716 "Cannot merge with an overloaded function declaration"); 717 718 // Verify the old decl was also a function. 719 FunctionDecl *Old = 0; 720 if (FunctionTemplateDecl *OldFunctionTemplate 721 = dyn_cast<FunctionTemplateDecl>(OldD)) 722 Old = OldFunctionTemplate->getTemplatedDecl(); 723 else 724 Old = dyn_cast<FunctionDecl>(OldD); 725 if (!Old) { 726 Diag(New->getLocation(), diag::err_redefinition_different_kind) 727 << New->getDeclName(); 728 Diag(OldD->getLocation(), diag::note_previous_definition); 729 return true; 730 } 731 732 // Determine whether the previous declaration was a definition, 733 // implicit declaration, or a declaration. 734 diag::kind PrevDiag; 735 if (Old->isThisDeclarationADefinition()) 736 PrevDiag = diag::note_previous_definition; 737 else if (Old->isImplicit()) 738 PrevDiag = diag::note_previous_implicit_declaration; 739 else 740 PrevDiag = diag::note_previous_declaration; 741 742 QualType OldQType = Context.getCanonicalType(Old->getType()); 743 QualType NewQType = Context.getCanonicalType(New->getType()); 744 745 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 746 New->getStorageClass() == FunctionDecl::Static && 747 Old->getStorageClass() != FunctionDecl::Static) { 748 Diag(New->getLocation(), diag::err_static_non_static) 749 << New; 750 Diag(Old->getLocation(), PrevDiag); 751 return true; 752 } 753 754 if (getLangOptions().CPlusPlus) { 755 // (C++98 13.1p2): 756 // Certain function declarations cannot be overloaded: 757 // -- Function declarations that differ only in the return type 758 // cannot be overloaded. 759 QualType OldReturnType 760 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 761 QualType NewReturnType 762 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 763 if (OldReturnType != NewReturnType) { 764 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 765 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 766 return true; 767 } 768 769 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 770 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 771 if (OldMethod && NewMethod && !NewMethod->getFriendObjectKind() && 772 NewMethod->getLexicalDeclContext()->isRecord()) { 773 // -- Member function declarations with the same name and the 774 // same parameter types cannot be overloaded if any of them 775 // is a static member function declaration. 776 if (OldMethod->isStatic() || NewMethod->isStatic()) { 777 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 778 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 779 return true; 780 } 781 782 // C++ [class.mem]p1: 783 // [...] A member shall not be declared twice in the 784 // member-specification, except that a nested class or member 785 // class template can be declared and then later defined. 786 unsigned NewDiag; 787 if (isa<CXXConstructorDecl>(OldMethod)) 788 NewDiag = diag::err_constructor_redeclared; 789 else if (isa<CXXDestructorDecl>(NewMethod)) 790 NewDiag = diag::err_destructor_redeclared; 791 else if (isa<CXXConversionDecl>(NewMethod)) 792 NewDiag = diag::err_conv_function_redeclared; 793 else 794 NewDiag = diag::err_member_redeclared; 795 796 Diag(New->getLocation(), NewDiag); 797 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 798 } 799 800 // (C++98 8.3.5p3): 801 // All declarations for a function shall agree exactly in both the 802 // return type and the parameter-type-list. 803 if (OldQType == NewQType) 804 return MergeCompatibleFunctionDecls(New, Old); 805 806 // Fall through for conflicting redeclarations and redefinitions. 807 } 808 809 // C: Function types need to be compatible, not identical. This handles 810 // duplicate function decls like "void f(int); void f(enum X);" properly. 811 if (!getLangOptions().CPlusPlus && 812 Context.typesAreCompatible(OldQType, NewQType)) { 813 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 814 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 815 const FunctionProtoType *OldProto = 0; 816 if (isa<FunctionNoProtoType>(NewFuncType) && 817 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 818 // The old declaration provided a function prototype, but the 819 // new declaration does not. Merge in the prototype. 820 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 821 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 822 OldProto->arg_type_end()); 823 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 824 ParamTypes.data(), ParamTypes.size(), 825 OldProto->isVariadic(), 826 OldProto->getTypeQuals()); 827 New->setType(NewQType); 828 New->setHasInheritedPrototype(); 829 830 // Synthesize a parameter for each argument type. 831 llvm::SmallVector<ParmVarDecl*, 16> Params; 832 for (FunctionProtoType::arg_type_iterator 833 ParamType = OldProto->arg_type_begin(), 834 ParamEnd = OldProto->arg_type_end(); 835 ParamType != ParamEnd; ++ParamType) { 836 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 837 SourceLocation(), 0, 838 *ParamType, /*DInfo=*/0, 839 VarDecl::None, 0); 840 Param->setImplicit(); 841 Params.push_back(Param); 842 } 843 844 New->setParams(Context, Params.data(), Params.size()); 845 } 846 847 return MergeCompatibleFunctionDecls(New, Old); 848 } 849 850 // GNU C permits a K&R definition to follow a prototype declaration 851 // if the declared types of the parameters in the K&R definition 852 // match the types in the prototype declaration, even when the 853 // promoted types of the parameters from the K&R definition differ 854 // from the types in the prototype. GCC then keeps the types from 855 // the prototype. 856 // 857 // If a variadic prototype is followed by a non-variadic K&R definition, 858 // the K&R definition becomes variadic. This is sort of an edge case, but 859 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 860 // C99 6.9.1p8. 861 if (!getLangOptions().CPlusPlus && 862 Old->hasPrototype() && !New->hasPrototype() && 863 New->getType()->getAs<FunctionProtoType>() && 864 Old->getNumParams() == New->getNumParams()) { 865 llvm::SmallVector<QualType, 16> ArgTypes; 866 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 867 const FunctionProtoType *OldProto 868 = Old->getType()->getAs<FunctionProtoType>(); 869 const FunctionProtoType *NewProto 870 = New->getType()->getAs<FunctionProtoType>(); 871 872 // Determine whether this is the GNU C extension. 873 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 874 NewProto->getResultType()); 875 bool LooseCompatible = !MergedReturn.isNull(); 876 for (unsigned Idx = 0, End = Old->getNumParams(); 877 LooseCompatible && Idx != End; ++Idx) { 878 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 879 ParmVarDecl *NewParm = New->getParamDecl(Idx); 880 if (Context.typesAreCompatible(OldParm->getType(), 881 NewProto->getArgType(Idx))) { 882 ArgTypes.push_back(NewParm->getType()); 883 } else if (Context.typesAreCompatible(OldParm->getType(), 884 NewParm->getType())) { 885 GNUCompatibleParamWarning Warn 886 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 887 Warnings.push_back(Warn); 888 ArgTypes.push_back(NewParm->getType()); 889 } else 890 LooseCompatible = false; 891 } 892 893 if (LooseCompatible) { 894 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 895 Diag(Warnings[Warn].NewParm->getLocation(), 896 diag::ext_param_promoted_not_compatible_with_prototype) 897 << Warnings[Warn].PromotedType 898 << Warnings[Warn].OldParm->getType(); 899 Diag(Warnings[Warn].OldParm->getLocation(), 900 diag::note_previous_declaration); 901 } 902 903 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 904 ArgTypes.size(), 905 OldProto->isVariadic(), 0)); 906 return MergeCompatibleFunctionDecls(New, Old); 907 } 908 909 // Fall through to diagnose conflicting types. 910 } 911 912 // A function that has already been declared has been redeclared or defined 913 // with a different type- show appropriate diagnostic 914 if (unsigned BuiltinID = Old->getBuiltinID()) { 915 // The user has declared a builtin function with an incompatible 916 // signature. 917 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 918 // The function the user is redeclaring is a library-defined 919 // function like 'malloc' or 'printf'. Warn about the 920 // redeclaration, then pretend that we don't know about this 921 // library built-in. 922 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 923 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 924 << Old << Old->getType(); 925 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 926 Old->setInvalidDecl(); 927 return false; 928 } 929 930 PrevDiag = diag::note_previous_builtin_declaration; 931 } 932 933 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 934 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 935 return true; 936} 937 938/// \brief Completes the merge of two function declarations that are 939/// known to be compatible. 940/// 941/// This routine handles the merging of attributes and other 942/// properties of function declarations form the old declaration to 943/// the new declaration, once we know that New is in fact a 944/// redeclaration of Old. 945/// 946/// \returns false 947bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 948 // Merge the attributes 949 MergeAttributes(New, Old, Context); 950 951 // Merge the storage class. 952 if (Old->getStorageClass() != FunctionDecl::Extern && 953 Old->getStorageClass() != FunctionDecl::None) 954 New->setStorageClass(Old->getStorageClass()); 955 956 // Merge "pure" flag. 957 if (Old->isPure()) 958 New->setPure(); 959 960 // Merge the "deleted" flag. 961 if (Old->isDeleted()) 962 New->setDeleted(); 963 964 if (getLangOptions().CPlusPlus) 965 return MergeCXXFunctionDecl(New, Old); 966 967 return false; 968} 969 970/// MergeVarDecl - We just parsed a variable 'New' which has the same name 971/// and scope as a previous declaration 'Old'. Figure out how to resolve this 972/// situation, merging decls or emitting diagnostics as appropriate. 973/// 974/// Tentative definition rules (C99 6.9.2p2) are checked by 975/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 976/// definitions here, since the initializer hasn't been attached. 977/// 978void Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 979 // If either decl is invalid, make sure the new one is marked invalid and 980 // don't do any other checking. 981 if (New->isInvalidDecl() || OldD->isInvalidDecl()) 982 return New->setInvalidDecl(); 983 984 // Verify the old decl was also a variable. 985 VarDecl *Old = dyn_cast<VarDecl>(OldD); 986 if (!Old) { 987 Diag(New->getLocation(), diag::err_redefinition_different_kind) 988 << New->getDeclName(); 989 Diag(OldD->getLocation(), diag::note_previous_definition); 990 return New->setInvalidDecl(); 991 } 992 993 MergeAttributes(New, Old, Context); 994 995 // Merge the types 996 QualType MergedT; 997 if (getLangOptions().CPlusPlus) { 998 if (Context.hasSameType(New->getType(), Old->getType())) 999 MergedT = New->getType(); 1000 // C++ [basic.types]p7: 1001 // [...] The declared type of an array object might be an array of 1002 // unknown size and therefore be incomplete at one point in a 1003 // translation unit and complete later on; [...] 1004 else if (Old->getType()->isIncompleteArrayType() && 1005 New->getType()->isArrayType()) { 1006 CanQual<ArrayType> OldArray 1007 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1008 CanQual<ArrayType> NewArray 1009 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1010 if (OldArray->getElementType() == NewArray->getElementType()) 1011 MergedT = New->getType(); 1012 } 1013 } else { 1014 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1015 } 1016 if (MergedT.isNull()) { 1017 Diag(New->getLocation(), diag::err_redefinition_different_type) 1018 << New->getDeclName(); 1019 Diag(Old->getLocation(), diag::note_previous_definition); 1020 return New->setInvalidDecl(); 1021 } 1022 New->setType(MergedT); 1023 1024 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1025 if (New->getStorageClass() == VarDecl::Static && 1026 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 1027 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1028 Diag(Old->getLocation(), diag::note_previous_definition); 1029 return New->setInvalidDecl(); 1030 } 1031 // C99 6.2.2p4: 1032 // For an identifier declared with the storage-class specifier 1033 // extern in a scope in which a prior declaration of that 1034 // identifier is visible,23) if the prior declaration specifies 1035 // internal or external linkage, the linkage of the identifier at 1036 // the later declaration is the same as the linkage specified at 1037 // the prior declaration. If no prior declaration is visible, or 1038 // if the prior declaration specifies no linkage, then the 1039 // identifier has external linkage. 1040 if (New->hasExternalStorage() && Old->hasLinkage()) 1041 /* Okay */; 1042 else if (New->getStorageClass() != VarDecl::Static && 1043 Old->getStorageClass() == VarDecl::Static) { 1044 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1045 Diag(Old->getLocation(), diag::note_previous_definition); 1046 return New->setInvalidDecl(); 1047 } 1048 1049 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1050 1051 // FIXME: The test for external storage here seems wrong? We still 1052 // need to check for mismatches. 1053 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1054 // Don't complain about out-of-line definitions of static members. 1055 !(Old->getLexicalDeclContext()->isRecord() && 1056 !New->getLexicalDeclContext()->isRecord())) { 1057 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1058 Diag(Old->getLocation(), diag::note_previous_definition); 1059 return New->setInvalidDecl(); 1060 } 1061 1062 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1063 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1064 Diag(Old->getLocation(), diag::note_previous_definition); 1065 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1066 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1067 Diag(Old->getLocation(), diag::note_previous_definition); 1068 } 1069 1070 // Keep a chain of previous declarations. 1071 New->setPreviousDeclaration(Old); 1072} 1073 1074/// CheckFallThrough - Check that we don't fall off the end of a 1075/// Statement that should return a value. 1076/// 1077/// \returns AlwaysFallThrough iff we always fall off the end of the statement, 1078/// MaybeFallThrough iff we might or might not fall off the end and 1079/// NeverFallThrough iff we never fall off the end of the statement. We assume 1080/// that functions not marked noreturn will return. 1081Sema::ControlFlowKind Sema::CheckFallThrough(Stmt *Root) { 1082 llvm::OwningPtr<CFG> cfg (CFG::buildCFG(Root, &Context)); 1083 1084 // FIXME: They should never return 0, fix that, delete this code. 1085 if (cfg == 0) 1086 return NeverFallThrough; 1087 // The CFG leaves in dead things, and we don't want to dead code paths to 1088 // confuse us, so we mark all live things first. 1089 std::queue<CFGBlock*> workq; 1090 llvm::BitVector live(cfg->getNumBlockIDs()); 1091 // Prep work queue 1092 workq.push(&cfg->getEntry()); 1093 // Solve 1094 while (!workq.empty()) { 1095 CFGBlock *item = workq.front(); 1096 workq.pop(); 1097 live.set(item->getBlockID()); 1098 for (CFGBlock::succ_iterator I=item->succ_begin(), 1099 E=item->succ_end(); 1100 I != E; 1101 ++I) { 1102 if ((*I) && !live[(*I)->getBlockID()]) { 1103 live.set((*I)->getBlockID()); 1104 workq.push(*I); 1105 } 1106 } 1107 } 1108 1109 // Now we know what is live, we check the live precessors of the exit block 1110 // and look for fall through paths, being careful to ignore normal returns, 1111 // and exceptional paths. 1112 bool HasLiveReturn = false; 1113 bool HasFakeEdge = false; 1114 bool HasPlainEdge = false; 1115 for (CFGBlock::succ_iterator I=cfg->getExit().pred_begin(), 1116 E = cfg->getExit().pred_end(); 1117 I != E; 1118 ++I) { 1119 CFGBlock& B = **I; 1120 if (!live[B.getBlockID()]) 1121 continue; 1122 if (B.size() == 0) { 1123 // A labeled empty statement, or the entry block... 1124 HasPlainEdge = true; 1125 continue; 1126 } 1127 Stmt *S = B[B.size()-1]; 1128 if (isa<ReturnStmt>(S)) { 1129 HasLiveReturn = true; 1130 continue; 1131 } 1132 if (isa<ObjCAtThrowStmt>(S)) { 1133 HasFakeEdge = true; 1134 continue; 1135 } 1136 if (isa<CXXThrowExpr>(S)) { 1137 HasFakeEdge = true; 1138 continue; 1139 } 1140 bool NoReturnEdge = false; 1141 if (CallExpr *C = dyn_cast<CallExpr>(S)) { 1142 Expr *CEE = C->getCallee()->IgnoreParenCasts(); 1143 if (CEE->getType().getNoReturnAttr()) { 1144 NoReturnEdge = true; 1145 HasFakeEdge = true; 1146 } else if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) { 1147 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(DRE->getDecl())) { 1148 if (FD->hasAttr<NoReturnAttr>()) { 1149 NoReturnEdge = true; 1150 HasFakeEdge = true; 1151 } 1152 } 1153 } 1154 } 1155 // FIXME: Add noreturn message sends. 1156 if (NoReturnEdge == false) 1157 HasPlainEdge = true; 1158 } 1159 if (!HasPlainEdge) 1160 return NeverFallThrough; 1161 if (HasFakeEdge || HasLiveReturn) 1162 return MaybeFallThrough; 1163 // This says AlwaysFallThrough for calls to functions that are not marked 1164 // noreturn, that don't return. If people would like this warning to be more 1165 // accurate, such functions should be marked as noreturn. 1166 return AlwaysFallThrough; 1167} 1168 1169/// CheckFallThroughForFunctionDef - Check that we don't fall off the end of a 1170/// function that should return a value. Check that we don't fall off the end 1171/// of a noreturn function. We assume that functions and blocks not marked 1172/// noreturn will return. 1173void Sema::CheckFallThroughForFunctionDef(Decl *D, Stmt *Body) { 1174 // FIXME: Would be nice if we had a better way to control cascading errors, 1175 // but for now, avoid them. The problem is that when Parse sees: 1176 // int foo() { return a; } 1177 // The return is eaten and the Sema code sees just: 1178 // int foo() { } 1179 // which this code would then warn about. 1180 if (getDiagnostics().hasErrorOccurred()) 1181 return; 1182 bool ReturnsVoid = false; 1183 bool HasNoReturn = false; 1184 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1185 if (FD->getResultType()->isVoidType()) 1186 ReturnsVoid = true; 1187 if (FD->hasAttr<NoReturnAttr>()) 1188 HasNoReturn = true; 1189 } else if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) { 1190 if (MD->getResultType()->isVoidType()) 1191 ReturnsVoid = true; 1192 if (MD->hasAttr<NoReturnAttr>()) 1193 HasNoReturn = true; 1194 } 1195 1196 // Short circuit for compilation speed. 1197 if ((Diags.getDiagnosticLevel(diag::warn_maybe_falloff_nonvoid_function) 1198 == Diagnostic::Ignored || ReturnsVoid) 1199 && (Diags.getDiagnosticLevel(diag::warn_noreturn_function_has_return_expr) 1200 == Diagnostic::Ignored || !HasNoReturn) 1201 && (Diags.getDiagnosticLevel(diag::warn_suggest_noreturn_block) 1202 == Diagnostic::Ignored || !ReturnsVoid)) 1203 return; 1204 // FIXME: Funtion try block 1205 if (CompoundStmt *Compound = dyn_cast<CompoundStmt>(Body)) { 1206 switch (CheckFallThrough(Body)) { 1207 case MaybeFallThrough: 1208 if (HasNoReturn) 1209 Diag(Compound->getRBracLoc(), diag::warn_falloff_noreturn_function); 1210 else if (!ReturnsVoid) 1211 Diag(Compound->getRBracLoc(),diag::warn_maybe_falloff_nonvoid_function); 1212 break; 1213 case AlwaysFallThrough: 1214 if (HasNoReturn) 1215 Diag(Compound->getRBracLoc(), diag::warn_falloff_noreturn_function); 1216 else if (!ReturnsVoid) 1217 Diag(Compound->getRBracLoc(), diag::warn_falloff_nonvoid_function); 1218 break; 1219 case NeverFallThrough: 1220 if (ReturnsVoid) 1221 Diag(Compound->getLBracLoc(), diag::warn_suggest_noreturn_function); 1222 break; 1223 } 1224 } 1225} 1226 1227/// CheckFallThroughForBlock - Check that we don't fall off the end of a block 1228/// that should return a value. Check that we don't fall off the end of a 1229/// noreturn block. We assume that functions and blocks not marked noreturn 1230/// will return. 1231void Sema::CheckFallThroughForBlock(QualType BlockTy, Stmt *Body) { 1232 // FIXME: Would be nice if we had a better way to control cascading errors, 1233 // but for now, avoid them. The problem is that when Parse sees: 1234 // int foo() { return a; } 1235 // The return is eaten and the Sema code sees just: 1236 // int foo() { } 1237 // which this code would then warn about. 1238 if (getDiagnostics().hasErrorOccurred()) 1239 return; 1240 bool ReturnsVoid = false; 1241 bool HasNoReturn = false; 1242 if (const FunctionType *FT = BlockTy->getPointeeType()->getAs<FunctionType>()) { 1243 if (FT->getResultType()->isVoidType()) 1244 ReturnsVoid = true; 1245 if (FT->getNoReturnAttr()) 1246 HasNoReturn = true; 1247 } 1248 1249 // Short circuit for compilation speed. 1250 if (ReturnsVoid 1251 && !HasNoReturn 1252 && (Diags.getDiagnosticLevel(diag::warn_suggest_noreturn_block) 1253 == Diagnostic::Ignored || !ReturnsVoid)) 1254 return; 1255 // FIXME: Funtion try block 1256 if (CompoundStmt *Compound = dyn_cast<CompoundStmt>(Body)) { 1257 switch (CheckFallThrough(Body)) { 1258 case MaybeFallThrough: 1259 if (HasNoReturn) 1260 Diag(Compound->getRBracLoc(), diag::err_noreturn_block_has_return_expr); 1261 else if (!ReturnsVoid) 1262 Diag(Compound->getRBracLoc(), diag::err_maybe_falloff_nonvoid_block); 1263 break; 1264 case AlwaysFallThrough: 1265 if (HasNoReturn) 1266 Diag(Compound->getRBracLoc(), diag::err_noreturn_block_has_return_expr); 1267 else if (!ReturnsVoid) 1268 Diag(Compound->getRBracLoc(), diag::err_falloff_nonvoid_block); 1269 break; 1270 case NeverFallThrough: 1271 if (ReturnsVoid) 1272 Diag(Compound->getLBracLoc(), diag::warn_suggest_noreturn_block); 1273 break; 1274 } 1275 } 1276} 1277 1278/// CheckParmsForFunctionDef - Check that the parameters of the given 1279/// function are appropriate for the definition of a function. This 1280/// takes care of any checks that cannot be performed on the 1281/// declaration itself, e.g., that the types of each of the function 1282/// parameters are complete. 1283bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 1284 bool HasInvalidParm = false; 1285 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 1286 ParmVarDecl *Param = FD->getParamDecl(p); 1287 1288 // C99 6.7.5.3p4: the parameters in a parameter type list in a 1289 // function declarator that is part of a function definition of 1290 // that function shall not have incomplete type. 1291 // 1292 // This is also C++ [dcl.fct]p6. 1293 if (!Param->isInvalidDecl() && 1294 RequireCompleteType(Param->getLocation(), Param->getType(), 1295 diag::err_typecheck_decl_incomplete_type)) { 1296 Param->setInvalidDecl(); 1297 HasInvalidParm = true; 1298 } 1299 1300 // C99 6.9.1p5: If the declarator includes a parameter type list, the 1301 // declaration of each parameter shall include an identifier. 1302 if (Param->getIdentifier() == 0 && 1303 !Param->isImplicit() && 1304 !getLangOptions().CPlusPlus) 1305 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 1306 } 1307 1308 return HasInvalidParm; 1309} 1310 1311/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1312/// no declarator (e.g. "struct foo;") is parsed. 1313Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1314 // FIXME: Error on auto/register at file scope 1315 // FIXME: Error on inline/virtual/explicit 1316 // FIXME: Error on invalid restrict 1317 // FIXME: Warn on useless __thread 1318 // FIXME: Warn on useless const/volatile 1319 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1320 // FIXME: Warn on useless attributes 1321 TagDecl *Tag = 0; 1322 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1323 DS.getTypeSpecType() == DeclSpec::TST_struct || 1324 DS.getTypeSpecType() == DeclSpec::TST_union || 1325 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1326 if (!DS.getTypeRep()) // We probably had an error 1327 return DeclPtrTy(); 1328 1329 // Note that the above type specs guarantee that the 1330 // type rep is a Decl, whereas in many of the others 1331 // it's a Type. 1332 Tag = dyn_cast<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 1333 } 1334 1335 if (DS.isFriendSpecified()) { 1336 // We have a "friend" declaration that does not have a declarator. 1337 // Look at the type to see if the friend declaration was handled 1338 // elsewhere (e.g., for friend classes and friend class templates). 1339 // If not, produce a suitable diagnostic or go try to befriend the 1340 // type itself. 1341 QualType T; 1342 if (DS.getTypeSpecType() == DeclSpec::TST_typename || 1343 DS.getTypeSpecType() == DeclSpec::TST_typeofType) 1344 T = QualType::getFromOpaquePtr(DS.getTypeRep()); 1345 else if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr || 1346 DS.getTypeSpecType() == DeclSpec::TST_decltype) 1347 T = ((Expr *)DS.getTypeRep())->getType(); 1348 else if (DS.getTypeSpecType() == DeclSpec::TST_class || 1349 DS.getTypeSpecType() == DeclSpec::TST_struct || 1350 DS.getTypeSpecType() == DeclSpec::TST_union) 1351 return DeclPtrTy::make(Tag); 1352 1353 if (T.isNull()) { 1354 // Fall through to diagnose this error, below. 1355 } else if (const RecordType *RecordT = T->getAs<RecordType>()) { 1356 // C++ [class.friend]p2: 1357 // An elaborated-type-specifier shall be used in a friend declaration 1358 // for a class. 1359 1360 // We have something like "friend C;", where C is the name of a 1361 // class type but is missing an elaborated type specifier. Complain, 1362 // but tell the user exactly how to fix the problem. 1363 RecordDecl *RecordD = RecordT->getDecl(); 1364 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 1365 << (unsigned)RecordD->getTagKind() 1366 << QualType(RecordT, 0) 1367 << SourceRange(DS.getFriendSpecLoc()) 1368 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 1369 RecordD->getKindName() + std::string(" ")); 1370 1371 // FIXME: We could go into ActOnTag to actually make the friend 1372 // declaration happen at this point. 1373 return DeclPtrTy(); 1374 } 1375 1376 if (!T.isNull() && T->isDependentType()) { 1377 // Since T is a dependent type, handle it as a friend type 1378 // declaration. 1379 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1380 } 1381 1382 // Complain about any non-dependent friend type here. 1383 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 1384 << DS.getSourceRange(); 1385 return DeclPtrTy(); 1386 } 1387 1388 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1389 if (!Record->getDeclName() && Record->isDefinition() && 1390 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1391 if (getLangOptions().CPlusPlus || 1392 Record->getDeclContext()->isRecord()) 1393 return BuildAnonymousStructOrUnion(S, DS, Record); 1394 1395 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1396 << DS.getSourceRange(); 1397 } 1398 1399 // Microsoft allows unnamed struct/union fields. Don't complain 1400 // about them. 1401 // FIXME: Should we support Microsoft's extensions in this area? 1402 if (Record->getDeclName() && getLangOptions().Microsoft) 1403 return DeclPtrTy::make(Tag); 1404 } 1405 1406 if (!DS.isMissingDeclaratorOk() && 1407 DS.getTypeSpecType() != DeclSpec::TST_error) { 1408 // Warn about typedefs of enums without names, since this is an 1409 // extension in both Microsoft an GNU. 1410 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1411 Tag && isa<EnumDecl>(Tag)) { 1412 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1413 << DS.getSourceRange(); 1414 return DeclPtrTy::make(Tag); 1415 } 1416 1417 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1418 << DS.getSourceRange(); 1419 return DeclPtrTy(); 1420 } 1421 1422 return DeclPtrTy::make(Tag); 1423} 1424 1425/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1426/// anonymous struct or union AnonRecord into the owning context Owner 1427/// and scope S. This routine will be invoked just after we realize 1428/// that an unnamed union or struct is actually an anonymous union or 1429/// struct, e.g., 1430/// 1431/// @code 1432/// union { 1433/// int i; 1434/// float f; 1435/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1436/// // f into the surrounding scope.x 1437/// @endcode 1438/// 1439/// This routine is recursive, injecting the names of nested anonymous 1440/// structs/unions into the owning context and scope as well. 1441bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1442 RecordDecl *AnonRecord) { 1443 bool Invalid = false; 1444 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1445 FEnd = AnonRecord->field_end(); 1446 F != FEnd; ++F) { 1447 if ((*F)->getDeclName()) { 1448 NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 1449 LookupOrdinaryName, true); 1450 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 1451 // C++ [class.union]p2: 1452 // The names of the members of an anonymous union shall be 1453 // distinct from the names of any other entity in the 1454 // scope in which the anonymous union is declared. 1455 unsigned diagKind 1456 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 1457 : diag::err_anonymous_struct_member_redecl; 1458 Diag((*F)->getLocation(), diagKind) 1459 << (*F)->getDeclName(); 1460 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1461 Invalid = true; 1462 } else { 1463 // C++ [class.union]p2: 1464 // For the purpose of name lookup, after the anonymous union 1465 // definition, the members of the anonymous union are 1466 // considered to have been defined in the scope in which the 1467 // anonymous union is declared. 1468 Owner->makeDeclVisibleInContext(*F); 1469 S->AddDecl(DeclPtrTy::make(*F)); 1470 IdResolver.AddDecl(*F); 1471 } 1472 } else if (const RecordType *InnerRecordType 1473 = (*F)->getType()->getAs<RecordType>()) { 1474 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1475 if (InnerRecord->isAnonymousStructOrUnion()) 1476 Invalid = Invalid || 1477 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1478 } 1479 } 1480 1481 return Invalid; 1482} 1483 1484/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1485/// anonymous structure or union. Anonymous unions are a C++ feature 1486/// (C++ [class.union]) and a GNU C extension; anonymous structures 1487/// are a GNU C and GNU C++ extension. 1488Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1489 RecordDecl *Record) { 1490 DeclContext *Owner = Record->getDeclContext(); 1491 1492 // Diagnose whether this anonymous struct/union is an extension. 1493 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1494 Diag(Record->getLocation(), diag::ext_anonymous_union); 1495 else if (!Record->isUnion()) 1496 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1497 1498 // C and C++ require different kinds of checks for anonymous 1499 // structs/unions. 1500 bool Invalid = false; 1501 if (getLangOptions().CPlusPlus) { 1502 const char* PrevSpec = 0; 1503 unsigned DiagID; 1504 // C++ [class.union]p3: 1505 // Anonymous unions declared in a named namespace or in the 1506 // global namespace shall be declared static. 1507 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1508 (isa<TranslationUnitDecl>(Owner) || 1509 (isa<NamespaceDecl>(Owner) && 1510 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1511 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1512 Invalid = true; 1513 1514 // Recover by adding 'static'. 1515 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1516 PrevSpec, DiagID); 1517 } 1518 // C++ [class.union]p3: 1519 // A storage class is not allowed in a declaration of an 1520 // anonymous union in a class scope. 1521 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1522 isa<RecordDecl>(Owner)) { 1523 Diag(DS.getStorageClassSpecLoc(), 1524 diag::err_anonymous_union_with_storage_spec); 1525 Invalid = true; 1526 1527 // Recover by removing the storage specifier. 1528 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1529 PrevSpec, DiagID); 1530 } 1531 1532 // C++ [class.union]p2: 1533 // The member-specification of an anonymous union shall only 1534 // define non-static data members. [Note: nested types and 1535 // functions cannot be declared within an anonymous union. ] 1536 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1537 MemEnd = Record->decls_end(); 1538 Mem != MemEnd; ++Mem) { 1539 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1540 // C++ [class.union]p3: 1541 // An anonymous union shall not have private or protected 1542 // members (clause 11). 1543 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1544 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1545 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1546 Invalid = true; 1547 } 1548 } else if ((*Mem)->isImplicit()) { 1549 // Any implicit members are fine. 1550 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1551 // This is a type that showed up in an 1552 // elaborated-type-specifier inside the anonymous struct or 1553 // union, but which actually declares a type outside of the 1554 // anonymous struct or union. It's okay. 1555 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1556 if (!MemRecord->isAnonymousStructOrUnion() && 1557 MemRecord->getDeclName()) { 1558 // This is a nested type declaration. 1559 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1560 << (int)Record->isUnion(); 1561 Invalid = true; 1562 } 1563 } else { 1564 // We have something that isn't a non-static data 1565 // member. Complain about it. 1566 unsigned DK = diag::err_anonymous_record_bad_member; 1567 if (isa<TypeDecl>(*Mem)) 1568 DK = diag::err_anonymous_record_with_type; 1569 else if (isa<FunctionDecl>(*Mem)) 1570 DK = diag::err_anonymous_record_with_function; 1571 else if (isa<VarDecl>(*Mem)) 1572 DK = diag::err_anonymous_record_with_static; 1573 Diag((*Mem)->getLocation(), DK) 1574 << (int)Record->isUnion(); 1575 Invalid = true; 1576 } 1577 } 1578 } 1579 1580 if (!Record->isUnion() && !Owner->isRecord()) { 1581 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1582 << (int)getLangOptions().CPlusPlus; 1583 Invalid = true; 1584 } 1585 1586 // Create a declaration for this anonymous struct/union. 1587 NamedDecl *Anon = 0; 1588 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1589 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1590 /*IdentifierInfo=*/0, 1591 Context.getTypeDeclType(Record), 1592 // FIXME: Type source info. 1593 /*DInfo=*/0, 1594 /*BitWidth=*/0, /*Mutable=*/false); 1595 Anon->setAccess(AS_public); 1596 if (getLangOptions().CPlusPlus) 1597 FieldCollector->Add(cast<FieldDecl>(Anon)); 1598 } else { 1599 VarDecl::StorageClass SC; 1600 switch (DS.getStorageClassSpec()) { 1601 default: assert(0 && "Unknown storage class!"); 1602 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1603 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1604 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1605 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1606 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1607 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1608 case DeclSpec::SCS_mutable: 1609 // mutable can only appear on non-static class members, so it's always 1610 // an error here 1611 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1612 Invalid = true; 1613 SC = VarDecl::None; 1614 break; 1615 } 1616 1617 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1618 /*IdentifierInfo=*/0, 1619 Context.getTypeDeclType(Record), 1620 // FIXME: Type source info. 1621 /*DInfo=*/0, 1622 SC); 1623 } 1624 Anon->setImplicit(); 1625 1626 // Add the anonymous struct/union object to the current 1627 // context. We'll be referencing this object when we refer to one of 1628 // its members. 1629 Owner->addDecl(Anon); 1630 1631 // Inject the members of the anonymous struct/union into the owning 1632 // context and into the identifier resolver chain for name lookup 1633 // purposes. 1634 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1635 Invalid = true; 1636 1637 // Mark this as an anonymous struct/union type. Note that we do not 1638 // do this until after we have already checked and injected the 1639 // members of this anonymous struct/union type, because otherwise 1640 // the members could be injected twice: once by DeclContext when it 1641 // builds its lookup table, and once by 1642 // InjectAnonymousStructOrUnionMembers. 1643 Record->setAnonymousStructOrUnion(true); 1644 1645 if (Invalid) 1646 Anon->setInvalidDecl(); 1647 1648 return DeclPtrTy::make(Anon); 1649} 1650 1651 1652/// GetNameForDeclarator - Determine the full declaration name for the 1653/// given Declarator. 1654DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1655 switch (D.getKind()) { 1656 case Declarator::DK_Abstract: 1657 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 1658 return DeclarationName(); 1659 1660 case Declarator::DK_Normal: 1661 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 1662 return DeclarationName(D.getIdentifier()); 1663 1664 case Declarator::DK_Constructor: { 1665 QualType Ty = GetTypeFromParser(D.getDeclaratorIdType()); 1666 return Context.DeclarationNames.getCXXConstructorName( 1667 Context.getCanonicalType(Ty)); 1668 } 1669 1670 case Declarator::DK_Destructor: { 1671 QualType Ty = GetTypeFromParser(D.getDeclaratorIdType()); 1672 return Context.DeclarationNames.getCXXDestructorName( 1673 Context.getCanonicalType(Ty)); 1674 } 1675 1676 case Declarator::DK_Conversion: { 1677 // FIXME: We'd like to keep the non-canonical type for diagnostics! 1678 QualType Ty = GetTypeFromParser(D.getDeclaratorIdType()); 1679 return Context.DeclarationNames.getCXXConversionFunctionName( 1680 Context.getCanonicalType(Ty)); 1681 } 1682 1683 case Declarator::DK_Operator: 1684 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 1685 return Context.DeclarationNames.getCXXOperatorName( 1686 D.getOverloadedOperator()); 1687 1688 case Declarator::DK_TemplateId: { 1689 TemplateName Name 1690 = TemplateName::getFromVoidPointer(D.getTemplateId()->Template); 1691 if (TemplateDecl *Template = Name.getAsTemplateDecl()) 1692 return Template->getDeclName(); 1693 if (OverloadedFunctionDecl *Ovl = Name.getAsOverloadedFunctionDecl()) 1694 return Ovl->getDeclName(); 1695 1696 return DeclarationName(); 1697 } 1698 } 1699 1700 assert(false && "Unknown name kind"); 1701 return DeclarationName(); 1702} 1703 1704/// isNearlyMatchingFunction - Determine whether the C++ functions 1705/// Declaration and Definition are "nearly" matching. This heuristic 1706/// is used to improve diagnostics in the case where an out-of-line 1707/// function definition doesn't match any declaration within 1708/// the class or namespace. 1709static bool isNearlyMatchingFunction(ASTContext &Context, 1710 FunctionDecl *Declaration, 1711 FunctionDecl *Definition) { 1712 if (Declaration->param_size() != Definition->param_size()) 1713 return false; 1714 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1715 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1716 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1717 1718 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1719 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 1720 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1721 return false; 1722 } 1723 1724 return true; 1725} 1726 1727Sema::DeclPtrTy 1728Sema::HandleDeclarator(Scope *S, Declarator &D, 1729 MultiTemplateParamsArg TemplateParamLists, 1730 bool IsFunctionDefinition) { 1731 DeclarationName Name = GetNameForDeclarator(D); 1732 1733 // All of these full declarators require an identifier. If it doesn't have 1734 // one, the ParsedFreeStandingDeclSpec action should be used. 1735 if (!Name) { 1736 if (!D.isInvalidType()) // Reject this if we think it is valid. 1737 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1738 diag::err_declarator_need_ident) 1739 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1740 return DeclPtrTy(); 1741 } 1742 1743 // The scope passed in may not be a decl scope. Zip up the scope tree until 1744 // we find one that is. 1745 while ((S->getFlags() & Scope::DeclScope) == 0 || 1746 (S->getFlags() & Scope::TemplateParamScope) != 0) 1747 S = S->getParent(); 1748 1749 // If this is an out-of-line definition of a member of a class template 1750 // or class template partial specialization, we may need to rebuild the 1751 // type specifier in the declarator. See RebuildTypeInCurrentInstantiation() 1752 // for more information. 1753 // FIXME: cope with decltype(expr) and typeof(expr) once the rebuilder can 1754 // handle expressions properly. 1755 DeclSpec &DS = const_cast<DeclSpec&>(D.getDeclSpec()); 1756 if (D.getCXXScopeSpec().isSet() && !D.getCXXScopeSpec().isInvalid() && 1757 isDependentScopeSpecifier(D.getCXXScopeSpec()) && 1758 (DS.getTypeSpecType() == DeclSpec::TST_typename || 1759 DS.getTypeSpecType() == DeclSpec::TST_typeofType || 1760 DS.getTypeSpecType() == DeclSpec::TST_typeofExpr || 1761 DS.getTypeSpecType() == DeclSpec::TST_decltype)) { 1762 if (DeclContext *DC = computeDeclContext(D.getCXXScopeSpec(), true)) { 1763 // FIXME: Preserve type source info. 1764 QualType T = GetTypeFromParser(DS.getTypeRep()); 1765 EnterDeclaratorContext(S, DC); 1766 T = RebuildTypeInCurrentInstantiation(T, D.getIdentifierLoc(), Name); 1767 ExitDeclaratorContext(S); 1768 if (T.isNull()) 1769 return DeclPtrTy(); 1770 DS.UpdateTypeRep(T.getAsOpaquePtr()); 1771 } 1772 } 1773 1774 DeclContext *DC; 1775 NamedDecl *PrevDecl; 1776 NamedDecl *New; 1777 1778 DeclaratorInfo *DInfo = 0; 1779 QualType R = GetTypeForDeclarator(D, S, &DInfo); 1780 1781 // See if this is a redefinition of a variable in the same scope. 1782 if (D.getCXXScopeSpec().isInvalid()) { 1783 DC = CurContext; 1784 PrevDecl = 0; 1785 D.setInvalidType(); 1786 } else if (!D.getCXXScopeSpec().isSet()) { 1787 LookupNameKind NameKind = LookupOrdinaryName; 1788 1789 // If the declaration we're planning to build will be a function 1790 // or object with linkage, then look for another declaration with 1791 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1792 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1793 /* Do nothing*/; 1794 else if (R->isFunctionType()) { 1795 if (CurContext->isFunctionOrMethod() || 1796 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1797 NameKind = LookupRedeclarationWithLinkage; 1798 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1799 NameKind = LookupRedeclarationWithLinkage; 1800 else if (CurContext->getLookupContext()->isTranslationUnit() && 1801 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1802 NameKind = LookupRedeclarationWithLinkage; 1803 1804 DC = CurContext; 1805 PrevDecl = LookupName(S, Name, NameKind, true, 1806 NameKind == LookupRedeclarationWithLinkage, 1807 D.getIdentifierLoc()); 1808 } else { // Something like "int foo::x;" 1809 DC = computeDeclContext(D.getCXXScopeSpec(), true); 1810 1811 if (!DC) { 1812 // If we could not compute the declaration context, it's because the 1813 // declaration context is dependent but does not refer to a class, 1814 // class template, or class template partial specialization. Complain 1815 // and return early, to avoid the coming semantic disaster. 1816 Diag(D.getIdentifierLoc(), 1817 diag::err_template_qualified_declarator_no_match) 1818 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 1819 << D.getCXXScopeSpec().getRange(); 1820 return DeclPtrTy(); 1821 } 1822 1823 PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName, true); 1824 1825 // C++ 7.3.1.2p2: 1826 // Members (including explicit specializations of templates) of a named 1827 // namespace can also be defined outside that namespace by explicit 1828 // qualification of the name being defined, provided that the entity being 1829 // defined was already declared in the namespace and the definition appears 1830 // after the point of declaration in a namespace that encloses the 1831 // declarations namespace. 1832 // 1833 // Note that we only check the context at this point. We don't yet 1834 // have enough information to make sure that PrevDecl is actually 1835 // the declaration we want to match. For example, given: 1836 // 1837 // class X { 1838 // void f(); 1839 // void f(float); 1840 // }; 1841 // 1842 // void X::f(int) { } // ill-formed 1843 // 1844 // In this case, PrevDecl will point to the overload set 1845 // containing the two f's declared in X, but neither of them 1846 // matches. 1847 1848 // First check whether we named the global scope. 1849 if (isa<TranslationUnitDecl>(DC)) { 1850 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1851 << Name << D.getCXXScopeSpec().getRange(); 1852 } else if (!CurContext->Encloses(DC)) { 1853 // The qualifying scope doesn't enclose the original declaration. 1854 // Emit diagnostic based on current scope. 1855 SourceLocation L = D.getIdentifierLoc(); 1856 SourceRange R = D.getCXXScopeSpec().getRange(); 1857 if (isa<FunctionDecl>(CurContext)) 1858 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1859 else 1860 Diag(L, diag::err_invalid_declarator_scope) 1861 << Name << cast<NamedDecl>(DC) << R; 1862 D.setInvalidType(); 1863 } 1864 } 1865 1866 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1867 // Maybe we will complain about the shadowed template parameter. 1868 if (!D.isInvalidType()) 1869 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl)) 1870 D.setInvalidType(); 1871 1872 // Just pretend that we didn't see the previous declaration. 1873 PrevDecl = 0; 1874 } 1875 1876 // In C++, the previous declaration we find might be a tag type 1877 // (class or enum). In this case, the new declaration will hide the 1878 // tag type. Note that this does does not apply if we're declaring a 1879 // typedef (C++ [dcl.typedef]p4). 1880 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 1881 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1882 PrevDecl = 0; 1883 1884 bool Redeclaration = false; 1885 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1886 if (TemplateParamLists.size()) { 1887 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 1888 return DeclPtrTy(); 1889 } 1890 1891 New = ActOnTypedefDeclarator(S, D, DC, R, DInfo, PrevDecl, Redeclaration); 1892 } else if (R->isFunctionType()) { 1893 New = ActOnFunctionDeclarator(S, D, DC, R, DInfo, PrevDecl, 1894 move(TemplateParamLists), 1895 IsFunctionDefinition, Redeclaration); 1896 } else { 1897 New = ActOnVariableDeclarator(S, D, DC, R, DInfo, PrevDecl, 1898 move(TemplateParamLists), 1899 Redeclaration); 1900 } 1901 1902 if (New == 0) 1903 return DeclPtrTy(); 1904 1905 // If this has an identifier and is not an invalid redeclaration or 1906 // function template specialization, add it to the scope stack. 1907 if (Name && !(Redeclaration && New->isInvalidDecl()) && 1908 !(isa<FunctionDecl>(New) && 1909 cast<FunctionDecl>(New)->isFunctionTemplateSpecialization())) 1910 PushOnScopeChains(New, S); 1911 1912 return DeclPtrTy::make(New); 1913} 1914 1915/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 1916/// types into constant array types in certain situations which would otherwise 1917/// be errors (for GCC compatibility). 1918static QualType TryToFixInvalidVariablyModifiedType(QualType T, 1919 ASTContext &Context, 1920 bool &SizeIsNegative) { 1921 // This method tries to turn a variable array into a constant 1922 // array even when the size isn't an ICE. This is necessary 1923 // for compatibility with code that depends on gcc's buggy 1924 // constant expression folding, like struct {char x[(int)(char*)2];} 1925 SizeIsNegative = false; 1926 1927 QualifierCollector Qs; 1928 const Type *Ty = Qs.strip(T); 1929 1930 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 1931 QualType Pointee = PTy->getPointeeType(); 1932 QualType FixedType = 1933 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 1934 if (FixedType.isNull()) return FixedType; 1935 FixedType = Context.getPointerType(FixedType); 1936 return Qs.apply(FixedType); 1937 } 1938 1939 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 1940 if (!VLATy) 1941 return QualType(); 1942 // FIXME: We should probably handle this case 1943 if (VLATy->getElementType()->isVariablyModifiedType()) 1944 return QualType(); 1945 1946 Expr::EvalResult EvalResult; 1947 if (!VLATy->getSizeExpr() || 1948 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 1949 !EvalResult.Val.isInt()) 1950 return QualType(); 1951 1952 llvm::APSInt &Res = EvalResult.Val.getInt(); 1953 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 1954 Expr* ArySizeExpr = VLATy->getSizeExpr(); 1955 // FIXME: here we could "steal" (how?) ArySizeExpr from the VLA, 1956 // so as to transfer ownership to the ConstantArrayWithExpr. 1957 // Alternatively, we could "clone" it (how?). 1958 // Since we don't know how to do things above, we just use the 1959 // very same Expr*. 1960 return Context.getConstantArrayWithExprType(VLATy->getElementType(), 1961 Res, ArySizeExpr, 1962 ArrayType::Normal, 0, 1963 VLATy->getBracketsRange()); 1964 } 1965 1966 SizeIsNegative = true; 1967 return QualType(); 1968} 1969 1970/// \brief Register the given locally-scoped external C declaration so 1971/// that it can be found later for redeclarations 1972void 1973Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, NamedDecl *PrevDecl, 1974 Scope *S) { 1975 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 1976 "Decl is not a locally-scoped decl!"); 1977 // Note that we have a locally-scoped external with this name. 1978 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 1979 1980 if (!PrevDecl) 1981 return; 1982 1983 // If there was a previous declaration of this variable, it may be 1984 // in our identifier chain. Update the identifier chain with the new 1985 // declaration. 1986 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 1987 // The previous declaration was found on the identifer resolver 1988 // chain, so remove it from its scope. 1989 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 1990 S = S->getParent(); 1991 1992 if (S) 1993 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 1994 } 1995} 1996 1997/// \brief Diagnose function specifiers on a declaration of an identifier that 1998/// does not identify a function. 1999void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2000 // FIXME: We should probably indicate the identifier in question to avoid 2001 // confusion for constructs like "inline int a(), b;" 2002 if (D.getDeclSpec().isInlineSpecified()) 2003 Diag(D.getDeclSpec().getInlineSpecLoc(), 2004 diag::err_inline_non_function); 2005 2006 if (D.getDeclSpec().isVirtualSpecified()) 2007 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2008 diag::err_virtual_non_function); 2009 2010 if (D.getDeclSpec().isExplicitSpecified()) 2011 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2012 diag::err_explicit_non_function); 2013} 2014 2015NamedDecl* 2016Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2017 QualType R, DeclaratorInfo *DInfo, 2018 NamedDecl* PrevDecl, bool &Redeclaration) { 2019 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2020 if (D.getCXXScopeSpec().isSet()) { 2021 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2022 << D.getCXXScopeSpec().getRange(); 2023 D.setInvalidType(); 2024 // Pretend we didn't see the scope specifier. 2025 DC = 0; 2026 } 2027 2028 if (getLangOptions().CPlusPlus) { 2029 // Check that there are no default arguments (C++ only). 2030 CheckExtraCXXDefaultArguments(D); 2031 } 2032 2033 DiagnoseFunctionSpecifiers(D); 2034 2035 if (D.getDeclSpec().isThreadSpecified()) 2036 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2037 2038 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R); 2039 if (!NewTD) return 0; 2040 2041 if (D.isInvalidType()) 2042 NewTD->setInvalidDecl(); 2043 2044 // Handle attributes prior to checking for duplicates in MergeVarDecl 2045 ProcessDeclAttributes(S, NewTD, D); 2046 // Merge the decl with the existing one if appropriate. If the decl is 2047 // in an outer scope, it isn't the same thing. 2048 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 2049 Redeclaration = true; 2050 MergeTypeDefDecl(NewTD, PrevDecl); 2051 } 2052 2053 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2054 // then it shall have block scope. 2055 QualType T = NewTD->getUnderlyingType(); 2056 if (T->isVariablyModifiedType()) { 2057 CurFunctionNeedsScopeChecking = true; 2058 2059 if (S->getFnParent() == 0) { 2060 bool SizeIsNegative; 2061 QualType FixedTy = 2062 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2063 if (!FixedTy.isNull()) { 2064 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2065 NewTD->setUnderlyingType(FixedTy); 2066 } else { 2067 if (SizeIsNegative) 2068 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2069 else if (T->isVariableArrayType()) 2070 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2071 else 2072 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2073 NewTD->setInvalidDecl(); 2074 } 2075 } 2076 } 2077 2078 // If this is the C FILE type, notify the AST context. 2079 if (IdentifierInfo *II = NewTD->getIdentifier()) 2080 if (!NewTD->isInvalidDecl() && 2081 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2082 if (II->isStr("FILE")) 2083 Context.setFILEDecl(NewTD); 2084 else if (II->isStr("jmp_buf")) 2085 Context.setjmp_bufDecl(NewTD); 2086 else if (II->isStr("sigjmp_buf")) 2087 Context.setsigjmp_bufDecl(NewTD); 2088 } 2089 2090 return NewTD; 2091} 2092 2093/// \brief Determines whether the given declaration is an out-of-scope 2094/// previous declaration. 2095/// 2096/// This routine should be invoked when name lookup has found a 2097/// previous declaration (PrevDecl) that is not in the scope where a 2098/// new declaration by the same name is being introduced. If the new 2099/// declaration occurs in a local scope, previous declarations with 2100/// linkage may still be considered previous declarations (C99 2101/// 6.2.2p4-5, C++ [basic.link]p6). 2102/// 2103/// \param PrevDecl the previous declaration found by name 2104/// lookup 2105/// 2106/// \param DC the context in which the new declaration is being 2107/// declared. 2108/// 2109/// \returns true if PrevDecl is an out-of-scope previous declaration 2110/// for a new delcaration with the same name. 2111static bool 2112isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2113 ASTContext &Context) { 2114 if (!PrevDecl) 2115 return 0; 2116 2117 // FIXME: PrevDecl could be an OverloadedFunctionDecl, in which 2118 // case we need to check each of the overloaded functions. 2119 if (!PrevDecl->hasLinkage()) 2120 return false; 2121 2122 if (Context.getLangOptions().CPlusPlus) { 2123 // C++ [basic.link]p6: 2124 // If there is a visible declaration of an entity with linkage 2125 // having the same name and type, ignoring entities declared 2126 // outside the innermost enclosing namespace scope, the block 2127 // scope declaration declares that same entity and receives the 2128 // linkage of the previous declaration. 2129 DeclContext *OuterContext = DC->getLookupContext(); 2130 if (!OuterContext->isFunctionOrMethod()) 2131 // This rule only applies to block-scope declarations. 2132 return false; 2133 else { 2134 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2135 if (PrevOuterContext->isRecord()) 2136 // We found a member function: ignore it. 2137 return false; 2138 else { 2139 // Find the innermost enclosing namespace for the new and 2140 // previous declarations. 2141 while (!OuterContext->isFileContext()) 2142 OuterContext = OuterContext->getParent(); 2143 while (!PrevOuterContext->isFileContext()) 2144 PrevOuterContext = PrevOuterContext->getParent(); 2145 2146 // The previous declaration is in a different namespace, so it 2147 // isn't the same function. 2148 if (OuterContext->getPrimaryContext() != 2149 PrevOuterContext->getPrimaryContext()) 2150 return false; 2151 } 2152 } 2153 } 2154 2155 return true; 2156} 2157 2158NamedDecl* 2159Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2160 QualType R, DeclaratorInfo *DInfo, 2161 NamedDecl* PrevDecl, 2162 MultiTemplateParamsArg TemplateParamLists, 2163 bool &Redeclaration) { 2164 DeclarationName Name = GetNameForDeclarator(D); 2165 2166 // Check that there are no default arguments (C++ only). 2167 if (getLangOptions().CPlusPlus) 2168 CheckExtraCXXDefaultArguments(D); 2169 2170 VarDecl *NewVD; 2171 VarDecl::StorageClass SC; 2172 switch (D.getDeclSpec().getStorageClassSpec()) { 2173 default: assert(0 && "Unknown storage class!"); 2174 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 2175 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 2176 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 2177 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 2178 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 2179 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 2180 case DeclSpec::SCS_mutable: 2181 // mutable can only appear on non-static class members, so it's always 2182 // an error here 2183 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2184 D.setInvalidType(); 2185 SC = VarDecl::None; 2186 break; 2187 } 2188 2189 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2190 if (!II) { 2191 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2192 << Name.getAsString(); 2193 return 0; 2194 } 2195 2196 DiagnoseFunctionSpecifiers(D); 2197 2198 if (!DC->isRecord() && S->getFnParent() == 0) { 2199 // C99 6.9p2: The storage-class specifiers auto and register shall not 2200 // appear in the declaration specifiers in an external declaration. 2201 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2202 2203 // If this is a register variable with an asm label specified, then this 2204 // is a GNU extension. 2205 if (SC == VarDecl::Register && D.getAsmLabel()) 2206 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2207 else 2208 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2209 D.setInvalidType(); 2210 } 2211 } 2212 if (DC->isRecord() && !CurContext->isRecord()) { 2213 // This is an out-of-line definition of a static data member. 2214 if (SC == VarDecl::Static) { 2215 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2216 diag::err_static_out_of_line) 2217 << CodeModificationHint::CreateRemoval( 2218 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 2219 } else if (SC == VarDecl::None) 2220 SC = VarDecl::Static; 2221 } 2222 if (SC == VarDecl::Static) { 2223 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2224 if (RD->isLocalClass()) 2225 Diag(D.getIdentifierLoc(), 2226 diag::err_static_data_member_not_allowed_in_local_class) 2227 << Name << RD->getDeclName(); 2228 } 2229 } 2230 2231 // Match up the template parameter lists with the scope specifier, then 2232 // determine whether we have a template or a template specialization. 2233 if (TemplateParameterList *TemplateParams 2234 = MatchTemplateParametersToScopeSpecifier( 2235 D.getDeclSpec().getSourceRange().getBegin(), 2236 D.getCXXScopeSpec(), 2237 (TemplateParameterList**)TemplateParamLists.get(), 2238 TemplateParamLists.size())) { 2239 if (TemplateParams->size() > 0) { 2240 // There is no such thing as a variable template. 2241 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2242 << II 2243 << SourceRange(TemplateParams->getTemplateLoc(), 2244 TemplateParams->getRAngleLoc()); 2245 return 0; 2246 } else { 2247 // There is an extraneous 'template<>' for this variable. Complain 2248 // about it, but allow the declaration of the variable. 2249 Diag(TemplateParams->getTemplateLoc(), 2250 diag::err_template_variable_noparams) 2251 << II 2252 << SourceRange(TemplateParams->getTemplateLoc(), 2253 TemplateParams->getRAngleLoc()); 2254 } 2255 } 2256 2257 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2258 II, R, DInfo, SC); 2259 2260 if (D.isInvalidType()) 2261 NewVD->setInvalidDecl(); 2262 2263 if (D.getDeclSpec().isThreadSpecified()) { 2264 if (NewVD->hasLocalStorage()) 2265 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2266 else if (!Context.Target.isTLSSupported()) 2267 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2268 else 2269 NewVD->setThreadSpecified(true); 2270 } 2271 2272 // Set the lexical context. If the declarator has a C++ scope specifier, the 2273 // lexical context will be different from the semantic context. 2274 NewVD->setLexicalDeclContext(CurContext); 2275 2276 // Handle attributes prior to checking for duplicates in MergeVarDecl 2277 ProcessDeclAttributes(S, NewVD, D); 2278 2279 // Handle GNU asm-label extension (encoded as an attribute). 2280 if (Expr *E = (Expr*) D.getAsmLabel()) { 2281 // The parser guarantees this is a string. 2282 StringLiteral *SE = cast<StringLiteral>(E); 2283 NewVD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 2284 SE->getByteLength()))); 2285 } 2286 2287 // If name lookup finds a previous declaration that is not in the 2288 // same scope as the new declaration, this may still be an 2289 // acceptable redeclaration. 2290 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 2291 !(NewVD->hasLinkage() && 2292 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 2293 PrevDecl = 0; 2294 2295 // Merge the decl with the existing one if appropriate. 2296 if (PrevDecl) { 2297 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 2298 // The user tried to define a non-static data member 2299 // out-of-line (C++ [dcl.meaning]p1). 2300 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2301 << D.getCXXScopeSpec().getRange(); 2302 PrevDecl = 0; 2303 NewVD->setInvalidDecl(); 2304 } 2305 } else if (D.getCXXScopeSpec().isSet()) { 2306 // No previous declaration in the qualifying scope. 2307 NestedNameSpecifier *NNS = 2308 (NestedNameSpecifier *)D.getCXXScopeSpec().getScopeRep(); 2309 DiagnoseMissingMember(D.getIdentifierLoc(), Name, NNS, 2310 D.getCXXScopeSpec().getRange()); 2311 NewVD->setInvalidDecl(); 2312 } 2313 2314 CheckVariableDeclaration(NewVD, PrevDecl, Redeclaration); 2315 2316 // attributes declared post-definition are currently ignored 2317 if (PrevDecl) { 2318 const VarDecl *Def = 0, *PrevVD = dyn_cast<VarDecl>(PrevDecl); 2319 if (PrevVD->getDefinition(Def) && D.hasAttributes()) { 2320 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2321 Diag(Def->getLocation(), diag::note_previous_definition); 2322 } 2323 } 2324 2325 // If this is a locally-scoped extern C variable, update the map of 2326 // such variables. 2327 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2328 !NewVD->isInvalidDecl()) 2329 RegisterLocallyScopedExternCDecl(NewVD, PrevDecl, S); 2330 2331 return NewVD; 2332} 2333 2334/// \brief Perform semantic checking on a newly-created variable 2335/// declaration. 2336/// 2337/// This routine performs all of the type-checking required for a 2338/// variable declaration once it has been built. It is used both to 2339/// check variables after they have been parsed and their declarators 2340/// have been translated into a declaration, and to check variables 2341/// that have been instantiated from a template. 2342/// 2343/// Sets NewVD->isInvalidDecl() if an error was encountered. 2344void Sema::CheckVariableDeclaration(VarDecl *NewVD, NamedDecl *PrevDecl, 2345 bool &Redeclaration) { 2346 // If the decl is already known invalid, don't check it. 2347 if (NewVD->isInvalidDecl()) 2348 return; 2349 2350 QualType T = NewVD->getType(); 2351 2352 if (T->isObjCInterfaceType()) { 2353 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2354 return NewVD->setInvalidDecl(); 2355 } 2356 2357 // The variable can not have an abstract class type. 2358 if (RequireNonAbstractType(NewVD->getLocation(), T, 2359 diag::err_abstract_type_in_decl, 2360 AbstractVariableType)) 2361 return NewVD->setInvalidDecl(); 2362 2363 // Emit an error if an address space was applied to decl with local storage. 2364 // This includes arrays of objects with address space qualifiers, but not 2365 // automatic variables that point to other address spaces. 2366 // ISO/IEC TR 18037 S5.1.2 2367 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2368 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2369 return NewVD->setInvalidDecl(); 2370 } 2371 2372 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2373 && !NewVD->hasAttr<BlocksAttr>()) 2374 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2375 2376 bool isVM = T->isVariablyModifiedType(); 2377 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2378 NewVD->hasAttr<BlocksAttr>()) 2379 CurFunctionNeedsScopeChecking = true; 2380 2381 if ((isVM && NewVD->hasLinkage()) || 2382 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2383 bool SizeIsNegative; 2384 QualType FixedTy = 2385 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2386 2387 if (FixedTy.isNull() && T->isVariableArrayType()) { 2388 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2389 // FIXME: This won't give the correct result for 2390 // int a[10][n]; 2391 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2392 2393 if (NewVD->isFileVarDecl()) 2394 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2395 << SizeRange; 2396 else if (NewVD->getStorageClass() == VarDecl::Static) 2397 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2398 << SizeRange; 2399 else 2400 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2401 << SizeRange; 2402 return NewVD->setInvalidDecl(); 2403 } 2404 2405 if (FixedTy.isNull()) { 2406 if (NewVD->isFileVarDecl()) 2407 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2408 else 2409 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2410 return NewVD->setInvalidDecl(); 2411 } 2412 2413 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2414 NewVD->setType(FixedTy); 2415 } 2416 2417 if (!PrevDecl && NewVD->isExternC()) { 2418 // Since we did not find anything by this name and we're declaring 2419 // an extern "C" variable, look for a non-visible extern "C" 2420 // declaration with the same name. 2421 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2422 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2423 if (Pos != LocallyScopedExternalDecls.end()) 2424 PrevDecl = Pos->second; 2425 } 2426 2427 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2428 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2429 << T; 2430 return NewVD->setInvalidDecl(); 2431 } 2432 2433 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2434 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2435 return NewVD->setInvalidDecl(); 2436 } 2437 2438 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2439 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2440 return NewVD->setInvalidDecl(); 2441 } 2442 2443 if (PrevDecl) { 2444 Redeclaration = true; 2445 MergeVarDecl(NewVD, PrevDecl); 2446 } 2447} 2448 2449static bool isUsingDecl(Decl *D) { 2450 return isa<UsingDecl>(D) || isa<UnresolvedUsingDecl>(D); 2451} 2452 2453NamedDecl* 2454Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2455 QualType R, DeclaratorInfo *DInfo, 2456 NamedDecl* PrevDecl, 2457 MultiTemplateParamsArg TemplateParamLists, 2458 bool IsFunctionDefinition, bool &Redeclaration) { 2459 assert(R.getTypePtr()->isFunctionType()); 2460 2461 DeclarationName Name = GetNameForDeclarator(D); 2462 FunctionDecl::StorageClass SC = FunctionDecl::None; 2463 switch (D.getDeclSpec().getStorageClassSpec()) { 2464 default: assert(0 && "Unknown storage class!"); 2465 case DeclSpec::SCS_auto: 2466 case DeclSpec::SCS_register: 2467 case DeclSpec::SCS_mutable: 2468 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2469 diag::err_typecheck_sclass_func); 2470 D.setInvalidType(); 2471 break; 2472 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2473 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2474 case DeclSpec::SCS_static: { 2475 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2476 // C99 6.7.1p5: 2477 // The declaration of an identifier for a function that has 2478 // block scope shall have no explicit storage-class specifier 2479 // other than extern 2480 // See also (C++ [dcl.stc]p4). 2481 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2482 diag::err_static_block_func); 2483 SC = FunctionDecl::None; 2484 } else 2485 SC = FunctionDecl::Static; 2486 break; 2487 } 2488 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2489 } 2490 2491 if (D.getDeclSpec().isThreadSpecified()) 2492 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2493 2494 bool isFriend = D.getDeclSpec().isFriendSpecified(); 2495 bool isInline = D.getDeclSpec().isInlineSpecified(); 2496 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2497 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2498 2499 // Check that the return type is not an abstract class type. 2500 // For record types, this is done by the AbstractClassUsageDiagnoser once 2501 // the class has been completely parsed. 2502 if (!DC->isRecord() && 2503 RequireNonAbstractType(D.getIdentifierLoc(), 2504 R->getAs<FunctionType>()->getResultType(), 2505 diag::err_abstract_type_in_decl, 2506 AbstractReturnType)) 2507 D.setInvalidType(); 2508 2509 // Do not allow returning a objc interface by-value. 2510 if (R->getAs<FunctionType>()->getResultType()->isObjCInterfaceType()) { 2511 Diag(D.getIdentifierLoc(), 2512 diag::err_object_cannot_be_passed_returned_by_value) << 0 2513 << R->getAs<FunctionType>()->getResultType(); 2514 D.setInvalidType(); 2515 } 2516 2517 bool isVirtualOkay = false; 2518 FunctionDecl *NewFD; 2519 2520 if (isFriend) { 2521 // DC is the namespace in which the function is being declared. 2522 assert((DC->isFileContext() || PrevDecl) && "previously-undeclared " 2523 "friend function being created in a non-namespace context"); 2524 2525 // C++ [class.friend]p5 2526 // A function can be defined in a friend declaration of a 2527 // class . . . . Such a function is implicitly inline. 2528 isInline |= IsFunctionDefinition; 2529 } 2530 2531 if (D.getKind() == Declarator::DK_Constructor) { 2532 // This is a C++ constructor declaration. 2533 assert(DC->isRecord() && 2534 "Constructors can only be declared in a member context"); 2535 2536 R = CheckConstructorDeclarator(D, R, SC); 2537 2538 // Create the new declaration 2539 NewFD = CXXConstructorDecl::Create(Context, 2540 cast<CXXRecordDecl>(DC), 2541 D.getIdentifierLoc(), Name, R, DInfo, 2542 isExplicit, isInline, 2543 /*isImplicitlyDeclared=*/false); 2544 } else if (D.getKind() == Declarator::DK_Destructor) { 2545 // This is a C++ destructor declaration. 2546 if (DC->isRecord()) { 2547 R = CheckDestructorDeclarator(D, SC); 2548 2549 NewFD = CXXDestructorDecl::Create(Context, 2550 cast<CXXRecordDecl>(DC), 2551 D.getIdentifierLoc(), Name, R, 2552 isInline, 2553 /*isImplicitlyDeclared=*/false); 2554 2555 isVirtualOkay = true; 2556 } else { 2557 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2558 2559 // Create a FunctionDecl to satisfy the function definition parsing 2560 // code path. 2561 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2562 Name, R, DInfo, SC, isInline, 2563 /*hasPrototype=*/true); 2564 D.setInvalidType(); 2565 } 2566 } else if (D.getKind() == Declarator::DK_Conversion) { 2567 if (!DC->isRecord()) { 2568 Diag(D.getIdentifierLoc(), 2569 diag::err_conv_function_not_member); 2570 return 0; 2571 } 2572 2573 CheckConversionDeclarator(D, R, SC); 2574 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2575 D.getIdentifierLoc(), Name, R, DInfo, 2576 isInline, isExplicit); 2577 2578 isVirtualOkay = true; 2579 } else if (DC->isRecord()) { 2580 // If the of the function is the same as the name of the record, then this 2581 // must be an invalid constructor that has a return type. 2582 // (The parser checks for a return type and makes the declarator a 2583 // constructor if it has no return type). 2584 // must have an invalid constructor that has a return type 2585 if (Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2586 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2587 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2588 << SourceRange(D.getIdentifierLoc()); 2589 return 0; 2590 } 2591 2592 // This is a C++ method declaration. 2593 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2594 D.getIdentifierLoc(), Name, R, DInfo, 2595 (SC == FunctionDecl::Static), isInline); 2596 2597 isVirtualOkay = (SC != FunctionDecl::Static); 2598 } else { 2599 // Determine whether the function was written with a 2600 // prototype. This true when: 2601 // - we're in C++ (where every function has a prototype), 2602 // - there is a prototype in the declarator, or 2603 // - the type R of the function is some kind of typedef or other reference 2604 // to a type name (which eventually refers to a function type). 2605 bool HasPrototype = 2606 getLangOptions().CPlusPlus || 2607 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2608 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2609 2610 NewFD = FunctionDecl::Create(Context, DC, 2611 D.getIdentifierLoc(), 2612 Name, R, DInfo, SC, isInline, HasPrototype); 2613 } 2614 2615 if (D.isInvalidType()) 2616 NewFD->setInvalidDecl(); 2617 2618 // Set the lexical context. If the declarator has a C++ 2619 // scope specifier, or is the object of a friend declaration, the 2620 // lexical context will be different from the semantic context. 2621 NewFD->setLexicalDeclContext(CurContext); 2622 2623 if (isFriend) 2624 NewFD->setObjectOfFriendDecl(/* PreviouslyDeclared= */ PrevDecl != NULL); 2625 2626 // Match up the template parameter lists with the scope specifier, then 2627 // determine whether we have a template or a template specialization. 2628 FunctionTemplateDecl *FunctionTemplate = 0; 2629 bool isFunctionTemplateSpecialization = false; 2630 if (TemplateParameterList *TemplateParams 2631 = MatchTemplateParametersToScopeSpecifier( 2632 D.getDeclSpec().getSourceRange().getBegin(), 2633 D.getCXXScopeSpec(), 2634 (TemplateParameterList**)TemplateParamLists.get(), 2635 TemplateParamLists.size())) { 2636 if (TemplateParams->size() > 0) { 2637 // This is a function template 2638 2639 // Check that we can declare a template here. 2640 if (CheckTemplateDeclScope(S, TemplateParams)) 2641 return 0; 2642 2643 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 2644 NewFD->getLocation(), 2645 Name, TemplateParams, 2646 NewFD); 2647 FunctionTemplate->setLexicalDeclContext(CurContext); 2648 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 2649 } else { 2650 // This is a function template specialization. 2651 isFunctionTemplateSpecialization = true; 2652 } 2653 2654 // FIXME: Free this memory properly. 2655 TemplateParamLists.release(); 2656 } 2657 2658 // C++ [dcl.fct.spec]p5: 2659 // The virtual specifier shall only be used in declarations of 2660 // nonstatic class member functions that appear within a 2661 // member-specification of a class declaration; see 10.3. 2662 // 2663 if (isVirtual && !NewFD->isInvalidDecl()) { 2664 if (!isVirtualOkay) { 2665 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2666 diag::err_virtual_non_function); 2667 } else if (!CurContext->isRecord()) { 2668 // 'virtual' was specified outside of the class. 2669 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2670 << CodeModificationHint::CreateRemoval( 2671 SourceRange(D.getDeclSpec().getVirtualSpecLoc())); 2672 } else { 2673 // Okay: Add virtual to the method. 2674 cast<CXXMethodDecl>(NewFD)->setVirtualAsWritten(true); 2675 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2676 CurClass->setAggregate(false); 2677 CurClass->setPOD(false); 2678 CurClass->setEmpty(false); 2679 CurClass->setPolymorphic(true); 2680 CurClass->setHasTrivialConstructor(false); 2681 CurClass->setHasTrivialCopyConstructor(false); 2682 CurClass->setHasTrivialCopyAssignment(false); 2683 } 2684 } 2685 2686 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) { 2687 // Look for virtual methods in base classes that this method might override. 2688 2689 BasePaths Paths; 2690 if (LookupInBases(cast<CXXRecordDecl>(DC), 2691 MemberLookupCriteria(NewMD), Paths)) { 2692 for (BasePaths::decl_iterator I = Paths.found_decls_begin(), 2693 E = Paths.found_decls_end(); I != E; ++I) { 2694 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2695 if (!CheckOverridingFunctionReturnType(NewMD, OldMD) && 2696 !CheckOverridingFunctionExceptionSpec(NewMD, OldMD)) 2697 NewMD->addOverriddenMethod(OldMD); 2698 } 2699 } 2700 } 2701 } 2702 2703 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 2704 !CurContext->isRecord()) { 2705 // C++ [class.static]p1: 2706 // A data or function member of a class may be declared static 2707 // in a class definition, in which case it is a static member of 2708 // the class. 2709 2710 // Complain about the 'static' specifier if it's on an out-of-line 2711 // member function definition. 2712 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2713 diag::err_static_out_of_line) 2714 << CodeModificationHint::CreateRemoval( 2715 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 2716 } 2717 2718 // Handle GNU asm-label extension (encoded as an attribute). 2719 if (Expr *E = (Expr*) D.getAsmLabel()) { 2720 // The parser guarantees this is a string. 2721 StringLiteral *SE = cast<StringLiteral>(E); 2722 NewFD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 2723 SE->getByteLength()))); 2724 } 2725 2726 // Copy the parameter declarations from the declarator D to the function 2727 // declaration NewFD, if they are available. First scavenge them into Params. 2728 llvm::SmallVector<ParmVarDecl*, 16> Params; 2729 if (D.getNumTypeObjects() > 0) { 2730 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2731 2732 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 2733 // function that takes no arguments, not a function that takes a 2734 // single void argument. 2735 // We let through "const void" here because Sema::GetTypeForDeclarator 2736 // already checks for that case. 2737 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2738 FTI.ArgInfo[0].Param && 2739 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 2740 // Empty arg list, don't push any params. 2741 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 2742 2743 // In C++, the empty parameter-type-list must be spelled "void"; a 2744 // typedef of void is not permitted. 2745 if (getLangOptions().CPlusPlus && 2746 Param->getType().getUnqualifiedType() != Context.VoidTy) 2747 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 2748 // FIXME: Leaks decl? 2749 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 2750 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2751 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 2752 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 2753 Param->setDeclContext(NewFD); 2754 Params.push_back(Param); 2755 } 2756 } 2757 2758 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 2759 // When we're declaring a function with a typedef, typeof, etc as in the 2760 // following example, we'll need to synthesize (unnamed) 2761 // parameters for use in the declaration. 2762 // 2763 // @code 2764 // typedef void fn(int); 2765 // fn f; 2766 // @endcode 2767 2768 // Synthesize a parameter for each argument type. 2769 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 2770 AE = FT->arg_type_end(); AI != AE; ++AI) { 2771 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, 2772 SourceLocation(), 0, 2773 *AI, /*DInfo=*/0, 2774 VarDecl::None, 0); 2775 Param->setImplicit(); 2776 Params.push_back(Param); 2777 } 2778 } else { 2779 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 2780 "Should not need args for typedef of non-prototype fn"); 2781 } 2782 // Finally, we know we have the right number of parameters, install them. 2783 NewFD->setParams(Context, Params.data(), Params.size()); 2784 2785 // If name lookup finds a previous declaration that is not in the 2786 // same scope as the new declaration, this may still be an 2787 // acceptable redeclaration. 2788 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 2789 !(NewFD->hasLinkage() && 2790 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 2791 PrevDecl = 0; 2792 2793 // If the declarator is a template-id, translate the parser's template 2794 // argument list into our AST format. 2795 bool HasExplicitTemplateArgs = false; 2796 llvm::SmallVector<TemplateArgument, 16> TemplateArgs; 2797 SourceLocation LAngleLoc, RAngleLoc; 2798 if (D.getKind() == Declarator::DK_TemplateId) { 2799 TemplateIdAnnotation *TemplateId = D.getTemplateId(); 2800 ASTTemplateArgsPtr TemplateArgsPtr(*this, 2801 TemplateId->getTemplateArgs(), 2802 TemplateId->getTemplateArgIsType(), 2803 TemplateId->NumArgs); 2804 translateTemplateArguments(TemplateArgsPtr, 2805 TemplateId->getTemplateArgLocations(), 2806 TemplateArgs); 2807 TemplateArgsPtr.release(); 2808 2809 HasExplicitTemplateArgs = true; 2810 LAngleLoc = TemplateId->LAngleLoc; 2811 RAngleLoc = TemplateId->RAngleLoc; 2812 2813 if (FunctionTemplate) { 2814 // FIXME: Diagnostic function template with explicit template 2815 // arguments. 2816 HasExplicitTemplateArgs = false; 2817 } else if (!isFunctionTemplateSpecialization && 2818 !D.getDeclSpec().isFriendSpecified()) { 2819 // We have encountered something that the user meant to be a 2820 // specialization (because it has explicitly-specified template 2821 // arguments) but that was not introduced with a "template<>" (or had 2822 // too few of them). 2823 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 2824 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 2825 << CodeModificationHint::CreateInsertion( 2826 D.getDeclSpec().getSourceRange().getBegin(), 2827 "template<> "); 2828 isFunctionTemplateSpecialization = true; 2829 } 2830 } 2831 2832 if (isFunctionTemplateSpecialization && 2833 CheckFunctionTemplateSpecialization(NewFD, HasExplicitTemplateArgs, 2834 LAngleLoc, TemplateArgs.data(), 2835 TemplateArgs.size(), RAngleLoc, 2836 PrevDecl)) 2837 NewFD->setInvalidDecl(); 2838 2839 // Perform semantic checking on the function declaration. 2840 bool OverloadableAttrRequired = false; // FIXME: HACK! 2841 CheckFunctionDeclaration(NewFD, PrevDecl, Redeclaration, 2842 /*FIXME:*/OverloadableAttrRequired); 2843 2844 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 2845 // An out-of-line member function declaration must also be a 2846 // definition (C++ [dcl.meaning]p1). 2847 // FIXME: Find a better way to recognize out-of-line specializations! 2848 if (!IsFunctionDefinition && !isFriend && 2849 !(TemplateParamLists.size() && !FunctionTemplate)) { 2850 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2851 << D.getCXXScopeSpec().getRange(); 2852 NewFD->setInvalidDecl(); 2853 } else if (!Redeclaration && (!PrevDecl || !isUsingDecl(PrevDecl))) { 2854 // The user tried to provide an out-of-line definition for a 2855 // function that is a member of a class or namespace, but there 2856 // was no such member function declared (C++ [class.mfct]p2, 2857 // C++ [namespace.memdef]p2). For example: 2858 // 2859 // class X { 2860 // void f() const; 2861 // }; 2862 // 2863 // void X::f() { } // ill-formed 2864 // 2865 // Complain about this problem, and attempt to suggest close 2866 // matches (e.g., those that differ only in cv-qualifiers and 2867 // whether the parameter types are references). 2868 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 2869 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 2870 NewFD->setInvalidDecl(); 2871 2872 LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 2873 true); 2874 assert(!Prev.isAmbiguous() && 2875 "Cannot have an ambiguity in previous-declaration lookup"); 2876 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 2877 Func != FuncEnd; ++Func) { 2878 if (isa<FunctionDecl>(*Func) && 2879 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 2880 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 2881 } 2882 2883 PrevDecl = 0; 2884 } 2885 } 2886 2887 // Handle attributes. We need to have merged decls when handling attributes 2888 // (for example to check for conflicts, etc). 2889 // FIXME: This needs to happen before we merge declarations. Then, 2890 // let attribute merging cope with attribute conflicts. 2891 ProcessDeclAttributes(S, NewFD, D); 2892 2893 // attributes declared post-definition are currently ignored 2894 if (Redeclaration && PrevDecl) { 2895 const FunctionDecl *Def, *PrevFD = dyn_cast<FunctionDecl>(PrevDecl); 2896 if (PrevFD && PrevFD->getBody(Def) && D.hasAttributes()) { 2897 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 2898 Diag(Def->getLocation(), diag::note_previous_definition); 2899 } 2900 } 2901 2902 AddKnownFunctionAttributes(NewFD); 2903 2904 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 2905 // If a function name is overloadable in C, then every function 2906 // with that name must be marked "overloadable". 2907 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 2908 << Redeclaration << NewFD; 2909 if (PrevDecl) 2910 Diag(PrevDecl->getLocation(), 2911 diag::note_attribute_overloadable_prev_overload); 2912 NewFD->addAttr(::new (Context) OverloadableAttr()); 2913 } 2914 2915 // If this is a locally-scoped extern C function, update the 2916 // map of such names. 2917 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 2918 && !NewFD->isInvalidDecl()) 2919 RegisterLocallyScopedExternCDecl(NewFD, PrevDecl, S); 2920 2921 // Set this FunctionDecl's range up to the right paren. 2922 NewFD->setLocEnd(D.getSourceRange().getEnd()); 2923 2924 if (FunctionTemplate && NewFD->isInvalidDecl()) 2925 FunctionTemplate->setInvalidDecl(); 2926 2927 if (FunctionTemplate) 2928 return FunctionTemplate; 2929 2930 return NewFD; 2931} 2932 2933/// \brief Perform semantic checking of a new function declaration. 2934/// 2935/// Performs semantic analysis of the new function declaration 2936/// NewFD. This routine performs all semantic checking that does not 2937/// require the actual declarator involved in the declaration, and is 2938/// used both for the declaration of functions as they are parsed 2939/// (called via ActOnDeclarator) and for the declaration of functions 2940/// that have been instantiated via C++ template instantiation (called 2941/// via InstantiateDecl). 2942/// 2943/// This sets NewFD->isInvalidDecl() to true if there was an error. 2944void Sema::CheckFunctionDeclaration(FunctionDecl *NewFD, NamedDecl *&PrevDecl, 2945 bool &Redeclaration, 2946 bool &OverloadableAttrRequired) { 2947 // If NewFD is already known erroneous, don't do any of this checking. 2948 if (NewFD->isInvalidDecl()) 2949 return; 2950 2951 if (NewFD->getResultType()->isVariablyModifiedType()) { 2952 // Functions returning a variably modified type violate C99 6.7.5.2p2 2953 // because all functions have linkage. 2954 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 2955 return NewFD->setInvalidDecl(); 2956 } 2957 2958 if (NewFD->isMain()) 2959 CheckMain(NewFD); 2960 2961 // Check for a previous declaration of this name. 2962 if (!PrevDecl && NewFD->isExternC()) { 2963 // Since we did not find anything by this name and we're declaring 2964 // an extern "C" function, look for a non-visible extern "C" 2965 // declaration with the same name. 2966 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2967 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 2968 if (Pos != LocallyScopedExternalDecls.end()) 2969 PrevDecl = Pos->second; 2970 } 2971 2972 // Merge or overload the declaration with an existing declaration of 2973 // the same name, if appropriate. 2974 if (PrevDecl) { 2975 // Determine whether NewFD is an overload of PrevDecl or 2976 // a declaration that requires merging. If it's an overload, 2977 // there's no more work to do here; we'll just add the new 2978 // function to the scope. 2979 OverloadedFunctionDecl::function_iterator MatchedDecl; 2980 2981 if (!getLangOptions().CPlusPlus && 2982 AllowOverloadingOfFunction(PrevDecl, Context)) { 2983 OverloadableAttrRequired = true; 2984 2985 // Functions marked "overloadable" must have a prototype (that 2986 // we can't get through declaration merging). 2987 if (!NewFD->getType()->getAs<FunctionProtoType>()) { 2988 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_no_prototype) 2989 << NewFD; 2990 Redeclaration = true; 2991 2992 // Turn this into a variadic function with no parameters. 2993 QualType R = Context.getFunctionType( 2994 NewFD->getType()->getAs<FunctionType>()->getResultType(), 2995 0, 0, true, 0); 2996 NewFD->setType(R); 2997 return NewFD->setInvalidDecl(); 2998 } 2999 } 3000 3001 if (PrevDecl && 3002 (!AllowOverloadingOfFunction(PrevDecl, Context) || 3003 !IsOverload(NewFD, PrevDecl, MatchedDecl)) && !isUsingDecl(PrevDecl)) { 3004 Redeclaration = true; 3005 Decl *OldDecl = PrevDecl; 3006 3007 // If PrevDecl was an overloaded function, extract the 3008 // FunctionDecl that matched. 3009 if (isa<OverloadedFunctionDecl>(PrevDecl)) 3010 OldDecl = *MatchedDecl; 3011 3012 // NewFD and OldDecl represent declarations that need to be 3013 // merged. 3014 if (MergeFunctionDecl(NewFD, OldDecl)) 3015 return NewFD->setInvalidDecl(); 3016 3017 if (FunctionTemplateDecl *OldTemplateDecl 3018 = dyn_cast<FunctionTemplateDecl>(OldDecl)) 3019 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3020 else { 3021 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3022 NewFD->setAccess(OldDecl->getAccess()); 3023 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3024 } 3025 } 3026 } 3027 3028 // Semantic checking for this function declaration (in isolation). 3029 if (getLangOptions().CPlusPlus) { 3030 // C++-specific checks. 3031 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3032 CheckConstructor(Constructor); 3033 } else if (isa<CXXDestructorDecl>(NewFD)) { 3034 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 3035 QualType ClassType = Context.getTypeDeclType(Record); 3036 if (!ClassType->isDependentType()) { 3037 DeclarationName Name 3038 = Context.DeclarationNames.getCXXDestructorName( 3039 Context.getCanonicalType(ClassType)); 3040 if (NewFD->getDeclName() != Name) { 3041 Diag(NewFD->getLocation(), diag::err_destructor_name); 3042 return NewFD->setInvalidDecl(); 3043 } 3044 } 3045 Record->setUserDeclaredDestructor(true); 3046 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3047 // user-defined destructor. 3048 Record->setPOD(false); 3049 3050 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3051 // declared destructor. 3052 // FIXME: C++0x: don't do this for "= default" destructors 3053 Record->setHasTrivialDestructor(false); 3054 } else if (CXXConversionDecl *Conversion 3055 = dyn_cast<CXXConversionDecl>(NewFD)) 3056 ActOnConversionDeclarator(Conversion); 3057 3058 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3059 if (NewFD->isOverloadedOperator() && 3060 CheckOverloadedOperatorDeclaration(NewFD)) 3061 return NewFD->setInvalidDecl(); 3062 3063 // In C++, check default arguments now that we have merged decls. Unless 3064 // the lexical context is the class, because in this case this is done 3065 // during delayed parsing anyway. 3066 if (!CurContext->isRecord()) 3067 CheckCXXDefaultArguments(NewFD); 3068 } 3069} 3070 3071void Sema::CheckMain(FunctionDecl* FD) { 3072 // C++ [basic.start.main]p3: A program that declares main to be inline 3073 // or static is ill-formed. 3074 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3075 // shall not appear in a declaration of main. 3076 // static main is not an error under C99, but we should warn about it. 3077 bool isInline = FD->isInline(); 3078 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3079 if (isInline || isStatic) { 3080 unsigned diagID = diag::warn_unusual_main_decl; 3081 if (isInline || getLangOptions().CPlusPlus) 3082 diagID = diag::err_unusual_main_decl; 3083 3084 int which = isStatic + (isInline << 1) - 1; 3085 Diag(FD->getLocation(), diagID) << which; 3086 } 3087 3088 QualType T = FD->getType(); 3089 assert(T->isFunctionType() && "function decl is not of function type"); 3090 const FunctionType* FT = T->getAs<FunctionType>(); 3091 3092 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3093 // TODO: add a replacement fixit to turn the return type into 'int'. 3094 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3095 FD->setInvalidDecl(true); 3096 } 3097 3098 // Treat protoless main() as nullary. 3099 if (isa<FunctionNoProtoType>(FT)) return; 3100 3101 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3102 unsigned nparams = FTP->getNumArgs(); 3103 assert(FD->getNumParams() == nparams); 3104 3105 if (nparams > 3) { 3106 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 3107 FD->setInvalidDecl(true); 3108 nparams = 3; 3109 } 3110 3111 // FIXME: a lot of the following diagnostics would be improved 3112 // if we had some location information about types. 3113 3114 QualType CharPP = 3115 Context.getPointerType(Context.getPointerType(Context.CharTy)); 3116 QualType Expected[] = { Context.IntTy, CharPP, CharPP }; 3117 3118 for (unsigned i = 0; i < nparams; ++i) { 3119 QualType AT = FTP->getArgType(i); 3120 3121 bool mismatch = true; 3122 3123 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 3124 mismatch = false; 3125 else if (Expected[i] == CharPP) { 3126 // As an extension, the following forms are okay: 3127 // char const ** 3128 // char const * const * 3129 // char * const * 3130 3131 QualifierCollector qs; 3132 const PointerType* PT; 3133 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 3134 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 3135 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 3136 qs.removeConst(); 3137 mismatch = !qs.empty(); 3138 } 3139 } 3140 3141 if (mismatch) { 3142 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 3143 // TODO: suggest replacing given type with expected type 3144 FD->setInvalidDecl(true); 3145 } 3146 } 3147 3148 if (nparams == 1 && !FD->isInvalidDecl()) { 3149 Diag(FD->getLocation(), diag::warn_main_one_arg); 3150 } 3151} 3152 3153bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 3154 // FIXME: Need strict checking. In C89, we need to check for 3155 // any assignment, increment, decrement, function-calls, or 3156 // commas outside of a sizeof. In C99, it's the same list, 3157 // except that the aforementioned are allowed in unevaluated 3158 // expressions. Everything else falls under the 3159 // "may accept other forms of constant expressions" exception. 3160 // (We never end up here for C++, so the constant expression 3161 // rules there don't matter.) 3162 if (Init->isConstantInitializer(Context)) 3163 return false; 3164 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 3165 << Init->getSourceRange(); 3166 return true; 3167} 3168 3169void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 3170 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 3171} 3172 3173/// AddInitializerToDecl - Adds the initializer Init to the 3174/// declaration dcl. If DirectInit is true, this is C++ direct 3175/// initialization rather than copy initialization. 3176void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 3177 Decl *RealDecl = dcl.getAs<Decl>(); 3178 // If there is no declaration, there was an error parsing it. Just ignore 3179 // the initializer. 3180 if (RealDecl == 0) 3181 return; 3182 3183 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 3184 // With declarators parsed the way they are, the parser cannot 3185 // distinguish between a normal initializer and a pure-specifier. 3186 // Thus this grotesque test. 3187 IntegerLiteral *IL; 3188 Expr *Init = static_cast<Expr *>(init.get()); 3189 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 3190 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 3191 if (Method->isVirtualAsWritten()) { 3192 Method->setPure(); 3193 3194 // A class is abstract if at least one function is pure virtual. 3195 cast<CXXRecordDecl>(CurContext)->setAbstract(true); 3196 } else if (!Method->isInvalidDecl()) { 3197 Diag(Method->getLocation(), diag::err_non_virtual_pure) 3198 << Method->getDeclName() << Init->getSourceRange(); 3199 Method->setInvalidDecl(); 3200 } 3201 } else { 3202 Diag(Method->getLocation(), diag::err_member_function_initialization) 3203 << Method->getDeclName() << Init->getSourceRange(); 3204 Method->setInvalidDecl(); 3205 } 3206 return; 3207 } 3208 3209 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3210 if (!VDecl) { 3211 if (getLangOptions().CPlusPlus && 3212 RealDecl->getLexicalDeclContext()->isRecord() && 3213 isa<NamedDecl>(RealDecl)) 3214 Diag(RealDecl->getLocation(), diag::err_member_initialization) 3215 << cast<NamedDecl>(RealDecl)->getDeclName(); 3216 else 3217 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3218 RealDecl->setInvalidDecl(); 3219 return; 3220 } 3221 3222 if (!VDecl->getType()->isArrayType() && 3223 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 3224 diag::err_typecheck_decl_incomplete_type)) { 3225 RealDecl->setInvalidDecl(); 3226 return; 3227 } 3228 3229 const VarDecl *Def = 0; 3230 if (VDecl->getDefinition(Def)) { 3231 Diag(VDecl->getLocation(), diag::err_redefinition) 3232 << VDecl->getDeclName(); 3233 Diag(Def->getLocation(), diag::note_previous_definition); 3234 VDecl->setInvalidDecl(); 3235 return; 3236 } 3237 3238 // Take ownership of the expression, now that we're sure we have somewhere 3239 // to put it. 3240 Expr *Init = init.takeAs<Expr>(); 3241 assert(Init && "missing initializer"); 3242 3243 // Get the decls type and save a reference for later, since 3244 // CheckInitializerTypes may change it. 3245 QualType DclT = VDecl->getType(), SavT = DclT; 3246 if (VDecl->isBlockVarDecl()) { 3247 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 3248 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 3249 VDecl->setInvalidDecl(); 3250 } else if (!VDecl->isInvalidDecl()) { 3251 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 3252 VDecl->getDeclName(), DirectInit)) 3253 VDecl->setInvalidDecl(); 3254 3255 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3256 // Don't check invalid declarations to avoid emitting useless diagnostics. 3257 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3258 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 3259 CheckForConstantInitializer(Init, DclT); 3260 } 3261 } 3262 } else if (VDecl->isStaticDataMember() && 3263 VDecl->getLexicalDeclContext()->isRecord()) { 3264 // This is an in-class initialization for a static data member, e.g., 3265 // 3266 // struct S { 3267 // static const int value = 17; 3268 // }; 3269 3270 // Attach the initializer 3271 VDecl->setInit(Context, Init); 3272 3273 // C++ [class.mem]p4: 3274 // A member-declarator can contain a constant-initializer only 3275 // if it declares a static member (9.4) of const integral or 3276 // const enumeration type, see 9.4.2. 3277 QualType T = VDecl->getType(); 3278 if (!T->isDependentType() && 3279 (!Context.getCanonicalType(T).isConstQualified() || 3280 !T->isIntegralType())) { 3281 Diag(VDecl->getLocation(), diag::err_member_initialization) 3282 << VDecl->getDeclName() << Init->getSourceRange(); 3283 VDecl->setInvalidDecl(); 3284 } else { 3285 // C++ [class.static.data]p4: 3286 // If a static data member is of const integral or const 3287 // enumeration type, its declaration in the class definition 3288 // can specify a constant-initializer which shall be an 3289 // integral constant expression (5.19). 3290 if (!Init->isTypeDependent() && 3291 !Init->getType()->isIntegralType()) { 3292 // We have a non-dependent, non-integral or enumeration type. 3293 Diag(Init->getSourceRange().getBegin(), 3294 diag::err_in_class_initializer_non_integral_type) 3295 << Init->getType() << Init->getSourceRange(); 3296 VDecl->setInvalidDecl(); 3297 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 3298 // Check whether the expression is a constant expression. 3299 llvm::APSInt Value; 3300 SourceLocation Loc; 3301 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 3302 Diag(Loc, diag::err_in_class_initializer_non_constant) 3303 << Init->getSourceRange(); 3304 VDecl->setInvalidDecl(); 3305 } else if (!VDecl->getType()->isDependentType()) 3306 ImpCastExprToType(Init, VDecl->getType()); 3307 } 3308 } 3309 } else if (VDecl->isFileVarDecl()) { 3310 if (VDecl->getStorageClass() == VarDecl::Extern) 3311 Diag(VDecl->getLocation(), diag::warn_extern_init); 3312 if (!VDecl->isInvalidDecl()) 3313 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 3314 VDecl->getDeclName(), DirectInit)) 3315 VDecl->setInvalidDecl(); 3316 3317 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3318 // Don't check invalid declarations to avoid emitting useless diagnostics. 3319 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3320 // C99 6.7.8p4. All file scoped initializers need to be constant. 3321 CheckForConstantInitializer(Init, DclT); 3322 } 3323 } 3324 // If the type changed, it means we had an incomplete type that was 3325 // completed by the initializer. For example: 3326 // int ary[] = { 1, 3, 5 }; 3327 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 3328 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 3329 VDecl->setType(DclT); 3330 Init->setType(DclT); 3331 } 3332 3333 Init = MaybeCreateCXXExprWithTemporaries(Init, 3334 /*ShouldDestroyTemporaries=*/true); 3335 // Attach the initializer to the decl. 3336 VDecl->setInit(Context, Init); 3337 3338 // If the previous declaration of VDecl was a tentative definition, 3339 // remove it from the set of tentative definitions. 3340 if (VDecl->getPreviousDeclaration() && 3341 VDecl->getPreviousDeclaration()->isTentativeDefinition(Context)) { 3342 bool Deleted = TentativeDefinitions.erase(VDecl->getDeclName()); 3343 assert(Deleted && "Unrecorded tentative definition?"); Deleted=Deleted; 3344 } 3345 3346 return; 3347} 3348 3349void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 3350 bool TypeContainsUndeducedAuto) { 3351 Decl *RealDecl = dcl.getAs<Decl>(); 3352 3353 // If there is no declaration, there was an error parsing it. Just ignore it. 3354 if (RealDecl == 0) 3355 return; 3356 3357 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 3358 QualType Type = Var->getType(); 3359 3360 // Record tentative definitions. 3361 if (Var->isTentativeDefinition(Context)) { 3362 std::pair<llvm::DenseMap<DeclarationName, VarDecl *>::iterator, bool> 3363 InsertPair = 3364 TentativeDefinitions.insert(std::make_pair(Var->getDeclName(), Var)); 3365 3366 // Keep the latest definition in the map. If we see 'int i; int i;' we 3367 // want the second one in the map. 3368 InsertPair.first->second = Var; 3369 3370 // However, for the list, we don't care about the order, just make sure 3371 // that there are no dupes for a given declaration name. 3372 if (InsertPair.second) 3373 TentativeDefinitionList.push_back(Var->getDeclName()); 3374 } 3375 3376 // C++ [dcl.init.ref]p3: 3377 // The initializer can be omitted for a reference only in a 3378 // parameter declaration (8.3.5), in the declaration of a 3379 // function return type, in the declaration of a class member 3380 // within its class declaration (9.2), and where the extern 3381 // specifier is explicitly used. 3382 if (Type->isReferenceType() && !Var->hasExternalStorage()) { 3383 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 3384 << Var->getDeclName() 3385 << SourceRange(Var->getLocation(), Var->getLocation()); 3386 Var->setInvalidDecl(); 3387 return; 3388 } 3389 3390 // C++0x [dcl.spec.auto]p3 3391 if (TypeContainsUndeducedAuto) { 3392 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 3393 << Var->getDeclName() << Type; 3394 Var->setInvalidDecl(); 3395 return; 3396 } 3397 3398 // C++ [dcl.init]p9: 3399 // If no initializer is specified for an object, and the object 3400 // is of (possibly cv-qualified) non-POD class type (or array 3401 // thereof), the object shall be default-initialized; if the 3402 // object is of const-qualified type, the underlying class type 3403 // shall have a user-declared default constructor. 3404 // 3405 // FIXME: Diagnose the "user-declared default constructor" bit. 3406 if (getLangOptions().CPlusPlus) { 3407 QualType InitType = Type; 3408 if (const ArrayType *Array = Context.getAsArrayType(Type)) 3409 InitType = Array->getElementType(); 3410 if ((!Var->hasExternalStorage() && !Var->isExternC()) && 3411 InitType->isRecordType() && !InitType->isDependentType()) { 3412 if (!RequireCompleteType(Var->getLocation(), InitType, 3413 diag::err_invalid_incomplete_type_use)) { 3414 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 3415 3416 CXXConstructorDecl *Constructor 3417 = PerformInitializationByConstructor(InitType, 3418 MultiExprArg(*this, 0, 0), 3419 Var->getLocation(), 3420 SourceRange(Var->getLocation(), 3421 Var->getLocation()), 3422 Var->getDeclName(), 3423 IK_Default, 3424 ConstructorArgs); 3425 3426 // FIXME: Location info for the variable initialization? 3427 if (!Constructor) 3428 Var->setInvalidDecl(); 3429 else { 3430 // FIXME: Cope with initialization of arrays 3431 if (!Constructor->isTrivial() && 3432 InitializeVarWithConstructor(Var, Constructor, InitType, 3433 move_arg(ConstructorArgs))) 3434 Var->setInvalidDecl(); 3435 3436 FinalizeVarWithDestructor(Var, InitType); 3437 } 3438 } 3439 } 3440 } 3441 3442#if 0 3443 // FIXME: Temporarily disabled because we are not properly parsing 3444 // linkage specifications on declarations, e.g., 3445 // 3446 // extern "C" const CGPoint CGPointerZero; 3447 // 3448 // C++ [dcl.init]p9: 3449 // 3450 // If no initializer is specified for an object, and the 3451 // object is of (possibly cv-qualified) non-POD class type (or 3452 // array thereof), the object shall be default-initialized; if 3453 // the object is of const-qualified type, the underlying class 3454 // type shall have a user-declared default 3455 // constructor. Otherwise, if no initializer is specified for 3456 // an object, the object and its subobjects, if any, have an 3457 // indeterminate initial value; if the object or any of its 3458 // subobjects are of const-qualified type, the program is 3459 // ill-formed. 3460 // 3461 // This isn't technically an error in C, so we don't diagnose it. 3462 // 3463 // FIXME: Actually perform the POD/user-defined default 3464 // constructor check. 3465 if (getLangOptions().CPlusPlus && 3466 Context.getCanonicalType(Type).isConstQualified() && 3467 !Var->hasExternalStorage()) 3468 Diag(Var->getLocation(), diag::err_const_var_requires_init) 3469 << Var->getName() 3470 << SourceRange(Var->getLocation(), Var->getLocation()); 3471#endif 3472 } 3473} 3474 3475Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 3476 DeclPtrTy *Group, 3477 unsigned NumDecls) { 3478 llvm::SmallVector<Decl*, 8> Decls; 3479 3480 if (DS.isTypeSpecOwned()) 3481 Decls.push_back((Decl*)DS.getTypeRep()); 3482 3483 for (unsigned i = 0; i != NumDecls; ++i) 3484 if (Decl *D = Group[i].getAs<Decl>()) 3485 Decls.push_back(D); 3486 3487 // Perform semantic analysis that depends on having fully processed both 3488 // the declarator and initializer. 3489 for (unsigned i = 0, e = Decls.size(); i != e; ++i) { 3490 VarDecl *IDecl = dyn_cast<VarDecl>(Decls[i]); 3491 if (!IDecl) 3492 continue; 3493 QualType T = IDecl->getType(); 3494 3495 // Block scope. C99 6.7p7: If an identifier for an object is declared with 3496 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 3497 if (IDecl->isBlockVarDecl() && !IDecl->hasExternalStorage()) { 3498 if (!IDecl->isInvalidDecl() && 3499 RequireCompleteType(IDecl->getLocation(), T, 3500 diag::err_typecheck_decl_incomplete_type)) 3501 IDecl->setInvalidDecl(); 3502 } 3503 // File scope. C99 6.9.2p2: A declaration of an identifier for an 3504 // object that has file scope without an initializer, and without a 3505 // storage-class specifier or with the storage-class specifier "static", 3506 // constitutes a tentative definition. Note: A tentative definition with 3507 // external linkage is valid (C99 6.2.2p5). 3508 if (IDecl->isTentativeDefinition(Context) && !IDecl->isInvalidDecl()) { 3509 if (const IncompleteArrayType *ArrayT 3510 = Context.getAsIncompleteArrayType(T)) { 3511 if (RequireCompleteType(IDecl->getLocation(), 3512 ArrayT->getElementType(), 3513 diag::err_illegal_decl_array_incomplete_type)) 3514 IDecl->setInvalidDecl(); 3515 } else if (IDecl->getStorageClass() == VarDecl::Static) { 3516 // C99 6.9.2p3: If the declaration of an identifier for an object is 3517 // a tentative definition and has internal linkage (C99 6.2.2p3), the 3518 // declared type shall not be an incomplete type. 3519 // NOTE: code such as the following 3520 // static struct s; 3521 // struct s { int a; }; 3522 // is accepted by gcc. Hence here we issue a warning instead of 3523 // an error and we do not invalidate the static declaration. 3524 // NOTE: to avoid multiple warnings, only check the first declaration. 3525 if (IDecl->getPreviousDeclaration() == 0) 3526 RequireCompleteType(IDecl->getLocation(), T, 3527 diag::ext_typecheck_decl_incomplete_type); 3528 } 3529 } 3530 } 3531 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 3532 Decls.data(), Decls.size())); 3533} 3534 3535 3536/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 3537/// to introduce parameters into function prototype scope. 3538Sema::DeclPtrTy 3539Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 3540 const DeclSpec &DS = D.getDeclSpec(); 3541 3542 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 3543 VarDecl::StorageClass StorageClass = VarDecl::None; 3544 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 3545 StorageClass = VarDecl::Register; 3546 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 3547 Diag(DS.getStorageClassSpecLoc(), 3548 diag::err_invalid_storage_class_in_func_decl); 3549 D.getMutableDeclSpec().ClearStorageClassSpecs(); 3550 } 3551 3552 if (D.getDeclSpec().isThreadSpecified()) 3553 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3554 3555 DiagnoseFunctionSpecifiers(D); 3556 3557 // Check that there are no default arguments inside the type of this 3558 // parameter (C++ only). 3559 if (getLangOptions().CPlusPlus) 3560 CheckExtraCXXDefaultArguments(D); 3561 3562 DeclaratorInfo *DInfo = 0; 3563 TagDecl *OwnedDecl = 0; 3564 QualType parmDeclType = GetTypeForDeclarator(D, S, &DInfo, /*Skip=*/0, 3565 &OwnedDecl); 3566 3567 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 3568 // C++ [dcl.fct]p6: 3569 // Types shall not be defined in return or parameter types. 3570 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 3571 << Context.getTypeDeclType(OwnedDecl); 3572 } 3573 3574 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 3575 // Can this happen for params? We already checked that they don't conflict 3576 // among each other. Here they can only shadow globals, which is ok. 3577 IdentifierInfo *II = D.getIdentifier(); 3578 if (II) { 3579 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3580 if (PrevDecl->isTemplateParameter()) { 3581 // Maybe we will complain about the shadowed template parameter. 3582 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3583 // Just pretend that we didn't see the previous declaration. 3584 PrevDecl = 0; 3585 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 3586 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 3587 3588 // Recover by removing the name 3589 II = 0; 3590 D.SetIdentifier(0, D.getIdentifierLoc()); 3591 } 3592 } 3593 } 3594 3595 // Parameters can not be abstract class types. 3596 // For record types, this is done by the AbstractClassUsageDiagnoser once 3597 // the class has been completely parsed. 3598 if (!CurContext->isRecord() && 3599 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 3600 diag::err_abstract_type_in_decl, 3601 AbstractParamType)) 3602 D.setInvalidType(true); 3603 3604 QualType T = adjustParameterType(parmDeclType); 3605 3606 ParmVarDecl *New; 3607 if (T == parmDeclType) // parameter type did not need adjustment 3608 New = ParmVarDecl::Create(Context, CurContext, 3609 D.getIdentifierLoc(), II, 3610 parmDeclType, DInfo, StorageClass, 3611 0); 3612 else // keep track of both the adjusted and unadjusted types 3613 New = OriginalParmVarDecl::Create(Context, CurContext, 3614 D.getIdentifierLoc(), II, T, DInfo, 3615 parmDeclType, StorageClass, 0); 3616 3617 if (D.isInvalidType()) 3618 New->setInvalidDecl(); 3619 3620 // Parameter declarators cannot be interface types. All ObjC objects are 3621 // passed by reference. 3622 if (T->isObjCInterfaceType()) { 3623 Diag(D.getIdentifierLoc(), 3624 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 3625 New->setInvalidDecl(); 3626 } 3627 3628 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 3629 if (D.getCXXScopeSpec().isSet()) { 3630 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 3631 << D.getCXXScopeSpec().getRange(); 3632 New->setInvalidDecl(); 3633 } 3634 3635 // Add the parameter declaration into this scope. 3636 S->AddDecl(DeclPtrTy::make(New)); 3637 if (II) 3638 IdResolver.AddDecl(New); 3639 3640 ProcessDeclAttributes(S, New, D); 3641 3642 if (New->hasAttr<BlocksAttr>()) { 3643 Diag(New->getLocation(), diag::err_block_on_nonlocal); 3644 } 3645 return DeclPtrTy::make(New); 3646} 3647 3648void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 3649 SourceLocation LocAfterDecls) { 3650 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3651 "Not a function declarator!"); 3652 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3653 3654 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 3655 // for a K&R function. 3656 if (!FTI.hasPrototype) { 3657 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 3658 --i; 3659 if (FTI.ArgInfo[i].Param == 0) { 3660 std::string Code = " int "; 3661 Code += FTI.ArgInfo[i].Ident->getName(); 3662 Code += ";\n"; 3663 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 3664 << FTI.ArgInfo[i].Ident 3665 << CodeModificationHint::CreateInsertion(LocAfterDecls, Code); 3666 3667 // Implicitly declare the argument as type 'int' for lack of a better 3668 // type. 3669 DeclSpec DS; 3670 const char* PrevSpec; // unused 3671 unsigned DiagID; // unused 3672 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 3673 PrevSpec, DiagID); 3674 Declarator ParamD(DS, Declarator::KNRTypeListContext); 3675 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 3676 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 3677 } 3678 } 3679 } 3680} 3681 3682Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 3683 Declarator &D) { 3684 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 3685 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3686 "Not a function declarator!"); 3687 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3688 3689 if (FTI.hasPrototype) { 3690 // FIXME: Diagnose arguments without names in C. 3691 } 3692 3693 Scope *ParentScope = FnBodyScope->getParent(); 3694 3695 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 3696 MultiTemplateParamsArg(*this), 3697 /*IsFunctionDefinition=*/true); 3698 return ActOnStartOfFunctionDef(FnBodyScope, DP); 3699} 3700 3701Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 3702 if (!D) 3703 return D; 3704 FunctionDecl *FD = 0; 3705 3706 if (FunctionTemplateDecl *FunTmpl 3707 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>())) 3708 FD = FunTmpl->getTemplatedDecl(); 3709 else 3710 FD = cast<FunctionDecl>(D.getAs<Decl>()); 3711 3712 CurFunctionNeedsScopeChecking = false; 3713 3714 // See if this is a redefinition. 3715 const FunctionDecl *Definition; 3716 if (FD->getBody(Definition)) { 3717 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 3718 Diag(Definition->getLocation(), diag::note_previous_definition); 3719 } 3720 3721 // Builtin functions cannot be defined. 3722 if (unsigned BuiltinID = FD->getBuiltinID()) { 3723 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 3724 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 3725 FD->setInvalidDecl(); 3726 } 3727 } 3728 3729 // The return type of a function definition must be complete 3730 // (C99 6.9.1p3, C++ [dcl.fct]p6). 3731 QualType ResultType = FD->getResultType(); 3732 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 3733 !FD->isInvalidDecl() && 3734 RequireCompleteType(FD->getLocation(), ResultType, 3735 diag::err_func_def_incomplete_result)) 3736 FD->setInvalidDecl(); 3737 3738 // GNU warning -Wmissing-prototypes: 3739 // Warn if a global function is defined without a previous 3740 // prototype declaration. This warning is issued even if the 3741 // definition itself provides a prototype. The aim is to detect 3742 // global functions that fail to be declared in header files. 3743 if (!FD->isInvalidDecl() && FD->isGlobal() && !isa<CXXMethodDecl>(FD) && 3744 !FD->isMain()) { 3745 bool MissingPrototype = true; 3746 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 3747 Prev; Prev = Prev->getPreviousDeclaration()) { 3748 // Ignore any declarations that occur in function or method 3749 // scope, because they aren't visible from the header. 3750 if (Prev->getDeclContext()->isFunctionOrMethod()) 3751 continue; 3752 3753 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 3754 break; 3755 } 3756 3757 if (MissingPrototype) 3758 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 3759 } 3760 3761 if (FnBodyScope) 3762 PushDeclContext(FnBodyScope, FD); 3763 3764 // Check the validity of our function parameters 3765 CheckParmsForFunctionDef(FD); 3766 3767 // Introduce our parameters into the function scope 3768 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 3769 ParmVarDecl *Param = FD->getParamDecl(p); 3770 Param->setOwningFunction(FD); 3771 3772 // If this has an identifier, add it to the scope stack. 3773 if (Param->getIdentifier() && FnBodyScope) 3774 PushOnScopeChains(Param, FnBodyScope); 3775 } 3776 3777 // Checking attributes of current function definition 3778 // dllimport attribute. 3779 if (FD->getAttr<DLLImportAttr>() && 3780 (!FD->getAttr<DLLExportAttr>())) { 3781 // dllimport attribute cannot be applied to definition. 3782 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 3783 Diag(FD->getLocation(), 3784 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 3785 << "dllimport"; 3786 FD->setInvalidDecl(); 3787 return DeclPtrTy::make(FD); 3788 } else { 3789 // If a symbol previously declared dllimport is later defined, the 3790 // attribute is ignored in subsequent references, and a warning is 3791 // emitted. 3792 Diag(FD->getLocation(), 3793 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 3794 << FD->getNameAsCString() << "dllimport"; 3795 } 3796 } 3797 return DeclPtrTy::make(FD); 3798} 3799 3800Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 3801 return ActOnFinishFunctionBody(D, move(BodyArg), false); 3802} 3803 3804Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 3805 bool IsInstantiation) { 3806 Decl *dcl = D.getAs<Decl>(); 3807 Stmt *Body = BodyArg.takeAs<Stmt>(); 3808 3809 FunctionDecl *FD = 0; 3810 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 3811 if (FunTmpl) 3812 FD = FunTmpl->getTemplatedDecl(); 3813 else 3814 FD = dyn_cast_or_null<FunctionDecl>(dcl); 3815 3816 if (FD) { 3817 FD->setBody(Body); 3818 if (FD->isMain()) 3819 // C and C++ allow for main to automagically return 0. 3820 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 3821 FD->setHasImplicitReturnZero(true); 3822 else 3823 CheckFallThroughForFunctionDef(FD, Body); 3824 3825 if (!FD->isInvalidDecl()) 3826 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 3827 3828 // C++ [basic.def.odr]p2: 3829 // [...] A virtual member function is used if it is not pure. [...] 3830 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 3831 if (Method->isVirtual() && !Method->isPure()) 3832 MarkDeclarationReferenced(Method->getLocation(), Method); 3833 3834 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 3835 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 3836 assert(MD == getCurMethodDecl() && "Method parsing confused"); 3837 MD->setBody(Body); 3838 CheckFallThroughForFunctionDef(MD, Body); 3839 MD->setEndLoc(Body->getLocEnd()); 3840 3841 if (!MD->isInvalidDecl()) 3842 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 3843 } else { 3844 Body->Destroy(Context); 3845 return DeclPtrTy(); 3846 } 3847 if (!IsInstantiation) 3848 PopDeclContext(); 3849 3850 // Verify and clean out per-function state. 3851 3852 assert(&getLabelMap() == &FunctionLabelMap && "Didn't pop block right?"); 3853 3854 // Check goto/label use. 3855 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 3856 I = FunctionLabelMap.begin(), E = FunctionLabelMap.end(); I != E; ++I) { 3857 LabelStmt *L = I->second; 3858 3859 // Verify that we have no forward references left. If so, there was a goto 3860 // or address of a label taken, but no definition of it. Label fwd 3861 // definitions are indicated with a null substmt. 3862 if (L->getSubStmt() != 0) 3863 continue; 3864 3865 // Emit error. 3866 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 3867 3868 // At this point, we have gotos that use the bogus label. Stitch it into 3869 // the function body so that they aren't leaked and that the AST is well 3870 // formed. 3871 if (Body == 0) { 3872 // The whole function wasn't parsed correctly, just delete this. 3873 L->Destroy(Context); 3874 continue; 3875 } 3876 3877 // Otherwise, the body is valid: we want to stitch the label decl into the 3878 // function somewhere so that it is properly owned and so that the goto 3879 // has a valid target. Do this by creating a new compound stmt with the 3880 // label in it. 3881 3882 // Give the label a sub-statement. 3883 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 3884 3885 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 3886 cast<CXXTryStmt>(Body)->getTryBlock() : 3887 cast<CompoundStmt>(Body); 3888 std::vector<Stmt*> Elements(Compound->body_begin(), Compound->body_end()); 3889 Elements.push_back(L); 3890 Compound->setStmts(Context, &Elements[0], Elements.size()); 3891 } 3892 FunctionLabelMap.clear(); 3893 3894 if (!Body) return D; 3895 3896 // Verify that that gotos and switch cases don't jump into scopes illegally. 3897 if (CurFunctionNeedsScopeChecking) 3898 DiagnoseInvalidJumps(Body); 3899 3900 // C++ constructors that have function-try-blocks can't have return 3901 // statements in the handlers of that block. (C++ [except.handle]p14) 3902 // Verify this. 3903 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 3904 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 3905 3906 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 3907 computeBaseOrMembersToDestroy(Destructor); 3908 return D; 3909} 3910 3911/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 3912/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 3913NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 3914 IdentifierInfo &II, Scope *S) { 3915 // Before we produce a declaration for an implicitly defined 3916 // function, see whether there was a locally-scoped declaration of 3917 // this name as a function or variable. If so, use that 3918 // (non-visible) declaration, and complain about it. 3919 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3920 = LocallyScopedExternalDecls.find(&II); 3921 if (Pos != LocallyScopedExternalDecls.end()) { 3922 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 3923 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 3924 return Pos->second; 3925 } 3926 3927 // Extension in C99. Legal in C90, but warn about it. 3928 if (getLangOptions().C99) 3929 Diag(Loc, diag::ext_implicit_function_decl) << &II; 3930 else 3931 Diag(Loc, diag::warn_implicit_function_decl) << &II; 3932 3933 // FIXME: handle stuff like: 3934 // void foo() { extern float X(); } 3935 // void bar() { X(); } <-- implicit decl for X in another scope. 3936 3937 // Set a Declarator for the implicit definition: int foo(); 3938 const char *Dummy; 3939 DeclSpec DS; 3940 unsigned DiagID; 3941 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 3942 Error = Error; // Silence warning. 3943 assert(!Error && "Error setting up implicit decl!"); 3944 Declarator D(DS, Declarator::BlockContext); 3945 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 3946 0, 0, false, SourceLocation(), 3947 false, 0,0,0, Loc, Loc, D), 3948 SourceLocation()); 3949 D.SetIdentifier(&II, Loc); 3950 3951 // Insert this function into translation-unit scope. 3952 3953 DeclContext *PrevDC = CurContext; 3954 CurContext = Context.getTranslationUnitDecl(); 3955 3956 FunctionDecl *FD = 3957 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 3958 FD->setImplicit(); 3959 3960 CurContext = PrevDC; 3961 3962 AddKnownFunctionAttributes(FD); 3963 3964 return FD; 3965} 3966 3967/// \brief Adds any function attributes that we know a priori based on 3968/// the declaration of this function. 3969/// 3970/// These attributes can apply both to implicitly-declared builtins 3971/// (like __builtin___printf_chk) or to library-declared functions 3972/// like NSLog or printf. 3973void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 3974 if (FD->isInvalidDecl()) 3975 return; 3976 3977 // If this is a built-in function, map its builtin attributes to 3978 // actual attributes. 3979 if (unsigned BuiltinID = FD->getBuiltinID()) { 3980 // Handle printf-formatting attributes. 3981 unsigned FormatIdx; 3982 bool HasVAListArg; 3983 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 3984 if (!FD->getAttr<FormatAttr>()) 3985 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 3986 HasVAListArg ? 0 : FormatIdx + 2)); 3987 } 3988 3989 // Mark const if we don't care about errno and that is the only 3990 // thing preventing the function from being const. This allows 3991 // IRgen to use LLVM intrinsics for such functions. 3992 if (!getLangOptions().MathErrno && 3993 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 3994 if (!FD->getAttr<ConstAttr>()) 3995 FD->addAttr(::new (Context) ConstAttr()); 3996 } 3997 3998 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 3999 FD->addAttr(::new (Context) NoReturnAttr()); 4000 } 4001 4002 IdentifierInfo *Name = FD->getIdentifier(); 4003 if (!Name) 4004 return; 4005 if ((!getLangOptions().CPlusPlus && 4006 FD->getDeclContext()->isTranslationUnit()) || 4007 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 4008 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 4009 LinkageSpecDecl::lang_c)) { 4010 // Okay: this could be a libc/libm/Objective-C function we know 4011 // about. 4012 } else 4013 return; 4014 4015 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 4016 // FIXME: NSLog and NSLogv should be target specific 4017 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 4018 // FIXME: We known better than our headers. 4019 const_cast<FormatAttr *>(Format)->setType("printf"); 4020 } else 4021 FD->addAttr(::new (Context) FormatAttr("printf", 1, 4022 Name->isStr("NSLogv") ? 0 : 2)); 4023 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 4024 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 4025 // target-specific builtins, perhaps? 4026 if (!FD->getAttr<FormatAttr>()) 4027 FD->addAttr(::new (Context) FormatAttr("printf", 2, 4028 Name->isStr("vasprintf") ? 0 : 3)); 4029 } 4030} 4031 4032TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T) { 4033 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 4034 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 4035 4036 // Scope manipulation handled by caller. 4037 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 4038 D.getIdentifierLoc(), 4039 D.getIdentifier(), 4040 T); 4041 4042 if (const TagType *TT = T->getAs<TagType>()) { 4043 TagDecl *TD = TT->getDecl(); 4044 4045 // If the TagDecl that the TypedefDecl points to is an anonymous decl 4046 // keep track of the TypedefDecl. 4047 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 4048 TD->setTypedefForAnonDecl(NewTD); 4049 } 4050 4051 if (D.isInvalidType()) 4052 NewTD->setInvalidDecl(); 4053 return NewTD; 4054} 4055 4056 4057/// \brief Determine whether a tag with a given kind is acceptable 4058/// as a redeclaration of the given tag declaration. 4059/// 4060/// \returns true if the new tag kind is acceptable, false otherwise. 4061bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 4062 TagDecl::TagKind NewTag, 4063 SourceLocation NewTagLoc, 4064 const IdentifierInfo &Name) { 4065 // C++ [dcl.type.elab]p3: 4066 // The class-key or enum keyword present in the 4067 // elaborated-type-specifier shall agree in kind with the 4068 // declaration to which the name in theelaborated-type-specifier 4069 // refers. This rule also applies to the form of 4070 // elaborated-type-specifier that declares a class-name or 4071 // friend class since it can be construed as referring to the 4072 // definition of the class. Thus, in any 4073 // elaborated-type-specifier, the enum keyword shall be used to 4074 // refer to an enumeration (7.2), the union class-keyshall be 4075 // used to refer to a union (clause 9), and either the class or 4076 // struct class-key shall be used to refer to a class (clause 9) 4077 // declared using the class or struct class-key. 4078 TagDecl::TagKind OldTag = Previous->getTagKind(); 4079 if (OldTag == NewTag) 4080 return true; 4081 4082 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 4083 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 4084 // Warn about the struct/class tag mismatch. 4085 bool isTemplate = false; 4086 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 4087 isTemplate = Record->getDescribedClassTemplate(); 4088 4089 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 4090 << (NewTag == TagDecl::TK_class) 4091 << isTemplate << &Name 4092 << CodeModificationHint::CreateReplacement(SourceRange(NewTagLoc), 4093 OldTag == TagDecl::TK_class? "class" : "struct"); 4094 Diag(Previous->getLocation(), diag::note_previous_use); 4095 return true; 4096 } 4097 return false; 4098} 4099 4100/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 4101/// former case, Name will be non-null. In the later case, Name will be null. 4102/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 4103/// reference/declaration/definition of a tag. 4104Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 4105 SourceLocation KWLoc, const CXXScopeSpec &SS, 4106 IdentifierInfo *Name, SourceLocation NameLoc, 4107 AttributeList *Attr, AccessSpecifier AS, 4108 MultiTemplateParamsArg TemplateParameterLists, 4109 bool &OwnedDecl, bool &IsDependent) { 4110 // If this is not a definition, it must have a name. 4111 assert((Name != 0 || TUK == TUK_Definition) && 4112 "Nameless record must be a definition!"); 4113 4114 OwnedDecl = false; 4115 TagDecl::TagKind Kind = TagDecl::getTagKindForTypeSpec(TagSpec); 4116 4117 if (TUK != TUK_Reference) { 4118 if (TemplateParameterList *TemplateParams 4119 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 4120 (TemplateParameterList**)TemplateParameterLists.get(), 4121 TemplateParameterLists.size())) { 4122 if (TemplateParams->size() > 0) { 4123 // This is a declaration or definition of a class template (which may 4124 // be a member of another template). 4125 OwnedDecl = false; 4126 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 4127 SS, Name, NameLoc, Attr, 4128 TemplateParams, 4129 AS); 4130 TemplateParameterLists.release(); 4131 return Result.get(); 4132 } else { 4133 // FIXME: diagnose the extraneous 'template<>', once we recover 4134 // slightly better in ParseTemplate.cpp from bogus template 4135 // parameters. 4136 } 4137 } 4138 } 4139 4140 DeclContext *SearchDC = CurContext; 4141 DeclContext *DC = CurContext; 4142 NamedDecl *PrevDecl = 0; 4143 bool isStdBadAlloc = false; 4144 bool Invalid = false; 4145 4146 if (Name && SS.isNotEmpty()) { 4147 // We have a nested-name tag ('struct foo::bar'). 4148 4149 // Check for invalid 'foo::'. 4150 if (SS.isInvalid()) { 4151 Name = 0; 4152 goto CreateNewDecl; 4153 } 4154 4155 // If this is a friend or a reference to a class in a dependent 4156 // context, don't try to make a decl for it. 4157 if (TUK == TUK_Friend || TUK == TUK_Reference) { 4158 DC = computeDeclContext(SS, false); 4159 if (!DC) { 4160 IsDependent = true; 4161 return DeclPtrTy(); 4162 } 4163 } 4164 4165 if (RequireCompleteDeclContext(SS)) 4166 return DeclPtrTy::make((Decl *)0); 4167 4168 DC = computeDeclContext(SS, true); 4169 SearchDC = DC; 4170 // Look-up name inside 'foo::'. 4171 PrevDecl 4172 = dyn_cast_or_null<TagDecl>( 4173 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 4174 4175 // A tag 'foo::bar' must already exist. 4176 if (PrevDecl == 0) { 4177 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 4178 Name = 0; 4179 Invalid = true; 4180 goto CreateNewDecl; 4181 } 4182 } else if (Name) { 4183 // If this is a named struct, check to see if there was a previous forward 4184 // declaration or definition. 4185 // FIXME: We're looking into outer scopes here, even when we 4186 // shouldn't be. Doing so can result in ambiguities that we 4187 // shouldn't be diagnosing. 4188 LookupResult R = LookupName(S, Name, LookupTagName, 4189 /*RedeclarationOnly=*/(TUK != TUK_Reference)); 4190 if (R.isAmbiguous()) { 4191 DiagnoseAmbiguousLookup(R, Name, NameLoc); 4192 // FIXME: This is not best way to recover from case like: 4193 // 4194 // struct S s; 4195 // 4196 // causes needless "incomplete type" error later. 4197 Name = 0; 4198 PrevDecl = 0; 4199 Invalid = true; 4200 } else 4201 PrevDecl = R; 4202 4203 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 4204 // FIXME: This makes sure that we ignore the contexts associated 4205 // with C structs, unions, and enums when looking for a matching 4206 // tag declaration or definition. See the similar lookup tweak 4207 // in Sema::LookupName; is there a better way to deal with this? 4208 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 4209 SearchDC = SearchDC->getParent(); 4210 } 4211 } 4212 4213 if (PrevDecl && PrevDecl->isTemplateParameter()) { 4214 // Maybe we will complain about the shadowed template parameter. 4215 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 4216 // Just pretend that we didn't see the previous declaration. 4217 PrevDecl = 0; 4218 } 4219 4220 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 4221 DC->Equals(StdNamespace) && Name->isStr("bad_alloc")) { 4222 // This is a declaration of or a reference to "std::bad_alloc". 4223 isStdBadAlloc = true; 4224 4225 if (!PrevDecl && StdBadAlloc) { 4226 // std::bad_alloc has been implicitly declared (but made invisible to 4227 // name lookup). Fill in this implicit declaration as the previous 4228 // declaration, so that the declarations get chained appropriately. 4229 PrevDecl = StdBadAlloc; 4230 } 4231 } 4232 4233 if (PrevDecl) { 4234 // Check whether the previous declaration is usable. 4235 (void)DiagnoseUseOfDecl(PrevDecl, NameLoc); 4236 4237 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 4238 // If this is a use of a previous tag, or if the tag is already declared 4239 // in the same scope (so that the definition/declaration completes or 4240 // rementions the tag), reuse the decl. 4241 if (TUK == TUK_Reference || TUK == TUK_Friend || 4242 isDeclInScope(PrevDecl, SearchDC, S)) { 4243 // Make sure that this wasn't declared as an enum and now used as a 4244 // struct or something similar. 4245 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 4246 bool SafeToContinue 4247 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 4248 Kind != TagDecl::TK_enum); 4249 if (SafeToContinue) 4250 Diag(KWLoc, diag::err_use_with_wrong_tag) 4251 << Name 4252 << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), 4253 PrevTagDecl->getKindName()); 4254 else 4255 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 4256 Diag(PrevDecl->getLocation(), diag::note_previous_use); 4257 4258 if (SafeToContinue) 4259 Kind = PrevTagDecl->getTagKind(); 4260 else { 4261 // Recover by making this an anonymous redefinition. 4262 Name = 0; 4263 PrevDecl = 0; 4264 Invalid = true; 4265 } 4266 } 4267 4268 if (!Invalid) { 4269 // If this is a use, just return the declaration we found. 4270 4271 // FIXME: In the future, return a variant or some other clue 4272 // for the consumer of this Decl to know it doesn't own it. 4273 // For our current ASTs this shouldn't be a problem, but will 4274 // need to be changed with DeclGroups. 4275 if (TUK == TUK_Reference) 4276 return DeclPtrTy::make(PrevDecl); 4277 4278 // If this is a friend, make sure we create the new 4279 // declaration in the appropriate semantic context. 4280 if (TUK == TUK_Friend) 4281 SearchDC = PrevDecl->getDeclContext(); 4282 4283 // Diagnose attempts to redefine a tag. 4284 if (TUK == TUK_Definition) { 4285 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 4286 Diag(NameLoc, diag::err_redefinition) << Name; 4287 Diag(Def->getLocation(), diag::note_previous_definition); 4288 // If this is a redefinition, recover by making this 4289 // struct be anonymous, which will make any later 4290 // references get the previous definition. 4291 Name = 0; 4292 PrevDecl = 0; 4293 Invalid = true; 4294 } else { 4295 // If the type is currently being defined, complain 4296 // about a nested redefinition. 4297 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 4298 if (Tag->isBeingDefined()) { 4299 Diag(NameLoc, diag::err_nested_redefinition) << Name; 4300 Diag(PrevTagDecl->getLocation(), 4301 diag::note_previous_definition); 4302 Name = 0; 4303 PrevDecl = 0; 4304 Invalid = true; 4305 } 4306 } 4307 4308 // Okay, this is definition of a previously declared or referenced 4309 // tag PrevDecl. We're going to create a new Decl for it. 4310 } 4311 } 4312 // If we get here we have (another) forward declaration or we 4313 // have a definition. Just create a new decl. 4314 4315 } else { 4316 // If we get here, this is a definition of a new tag type in a nested 4317 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 4318 // new decl/type. We set PrevDecl to NULL so that the entities 4319 // have distinct types. 4320 PrevDecl = 0; 4321 } 4322 // If we get here, we're going to create a new Decl. If PrevDecl 4323 // is non-NULL, it's a definition of the tag declared by 4324 // PrevDecl. If it's NULL, we have a new definition. 4325 } else { 4326 // PrevDecl is a namespace, template, or anything else 4327 // that lives in the IDNS_Tag identifier namespace. 4328 if (isDeclInScope(PrevDecl, SearchDC, S)) { 4329 // The tag name clashes with a namespace name, issue an error and 4330 // recover by making this tag be anonymous. 4331 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 4332 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4333 Name = 0; 4334 PrevDecl = 0; 4335 Invalid = true; 4336 } else { 4337 // The existing declaration isn't relevant to us; we're in a 4338 // new scope, so clear out the previous declaration. 4339 PrevDecl = 0; 4340 } 4341 } 4342 } else if (TUK == TUK_Reference && SS.isEmpty() && Name && 4343 (Kind != TagDecl::TK_enum || !getLangOptions().CPlusPlus)) { 4344 // C++ [basic.scope.pdecl]p5: 4345 // -- for an elaborated-type-specifier of the form 4346 // 4347 // class-key identifier 4348 // 4349 // if the elaborated-type-specifier is used in the 4350 // decl-specifier-seq or parameter-declaration-clause of a 4351 // function defined in namespace scope, the identifier is 4352 // declared as a class-name in the namespace that contains 4353 // the declaration; otherwise, except as a friend 4354 // declaration, the identifier is declared in the smallest 4355 // non-class, non-function-prototype scope that contains the 4356 // declaration. 4357 // 4358 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 4359 // C structs and unions. 4360 // 4361 // GNU C also supports this behavior as part of its incomplete 4362 // enum types extension, while GNU C++ does not. 4363 // 4364 // Find the context where we'll be declaring the tag. 4365 // FIXME: We would like to maintain the current DeclContext as the 4366 // lexical context, 4367 while (SearchDC->isRecord()) 4368 SearchDC = SearchDC->getParent(); 4369 4370 // Find the scope where we'll be declaring the tag. 4371 while (S->isClassScope() || 4372 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 4373 ((S->getFlags() & Scope::DeclScope) == 0) || 4374 (S->getEntity() && 4375 ((DeclContext *)S->getEntity())->isTransparentContext())) 4376 S = S->getParent(); 4377 4378 } else if (TUK == TUK_Friend && SS.isEmpty() && Name) { 4379 // C++ [namespace.memdef]p3: 4380 // If a friend declaration in a non-local class first declares a 4381 // class or function, the friend class or function is a member of 4382 // the innermost enclosing namespace. 4383 while (!SearchDC->isFileContext()) 4384 SearchDC = SearchDC->getParent(); 4385 4386 // The entity of a decl scope is a DeclContext; see PushDeclContext. 4387 while (S->getEntity() != SearchDC) 4388 S = S->getParent(); 4389 } 4390 4391CreateNewDecl: 4392 4393 // If there is an identifier, use the location of the identifier as the 4394 // location of the decl, otherwise use the location of the struct/union 4395 // keyword. 4396 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 4397 4398 // Otherwise, create a new declaration. If there is a previous 4399 // declaration of the same entity, the two will be linked via 4400 // PrevDecl. 4401 TagDecl *New; 4402 4403 if (Kind == TagDecl::TK_enum) { 4404 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4405 // enum X { A, B, C } D; D should chain to X. 4406 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 4407 cast_or_null<EnumDecl>(PrevDecl)); 4408 // If this is an undefined enum, warn. 4409 if (TUK != TUK_Definition && !Invalid) { 4410 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 4411 : diag::ext_forward_ref_enum; 4412 Diag(Loc, DK); 4413 } 4414 } else { 4415 // struct/union/class 4416 4417 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4418 // struct X { int A; } D; D should chain to X. 4419 if (getLangOptions().CPlusPlus) { 4420 // FIXME: Look for a way to use RecordDecl for simple structs. 4421 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4422 cast_or_null<CXXRecordDecl>(PrevDecl)); 4423 4424 if (isStdBadAlloc && (!StdBadAlloc || StdBadAlloc->isImplicit())) 4425 StdBadAlloc = cast<CXXRecordDecl>(New); 4426 } else 4427 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4428 cast_or_null<RecordDecl>(PrevDecl)); 4429 } 4430 4431 if (Kind != TagDecl::TK_enum) { 4432 // Handle #pragma pack: if the #pragma pack stack has non-default 4433 // alignment, make up a packed attribute for this decl. These 4434 // attributes are checked when the ASTContext lays out the 4435 // structure. 4436 // 4437 // It is important for implementing the correct semantics that this 4438 // happen here (in act on tag decl). The #pragma pack stack is 4439 // maintained as a result of parser callbacks which can occur at 4440 // many points during the parsing of a struct declaration (because 4441 // the #pragma tokens are effectively skipped over during the 4442 // parsing of the struct). 4443 if (unsigned Alignment = getPragmaPackAlignment()) 4444 New->addAttr(::new (Context) PragmaPackAttr(Alignment * 8)); 4445 } 4446 4447 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 4448 // C++ [dcl.typedef]p3: 4449 // [...] Similarly, in a given scope, a class or enumeration 4450 // shall not be declared with the same name as a typedef-name 4451 // that is declared in that scope and refers to a type other 4452 // than the class or enumeration itself. 4453 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 4454 TypedefDecl *PrevTypedef = 0; 4455 if (Lookup.getKind() == LookupResult::Found) 4456 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 4457 4458 NamedDecl *PrevTypedefNamed = PrevTypedef; 4459 if (PrevTypedef && isDeclInScope(PrevTypedefNamed, SearchDC, S) && 4460 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 4461 Context.getCanonicalType(Context.getTypeDeclType(New))) { 4462 Diag(Loc, diag::err_tag_definition_of_typedef) 4463 << Context.getTypeDeclType(New) 4464 << PrevTypedef->getUnderlyingType(); 4465 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 4466 Invalid = true; 4467 } 4468 } 4469 4470 if (Invalid) 4471 New->setInvalidDecl(); 4472 4473 if (Attr) 4474 ProcessDeclAttributeList(S, New, Attr); 4475 4476 // If we're declaring or defining a tag in function prototype scope 4477 // in C, note that this type can only be used within the function. 4478 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 4479 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 4480 4481 // Set the lexical context. If the tag has a C++ scope specifier, the 4482 // lexical context will be different from the semantic context. 4483 New->setLexicalDeclContext(CurContext); 4484 4485 // Mark this as a friend decl if applicable. 4486 if (TUK == TUK_Friend) 4487 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ PrevDecl != NULL); 4488 4489 // Set the access specifier. 4490 if (!Invalid && TUK != TUK_Friend) 4491 SetMemberAccessSpecifier(New, PrevDecl, AS); 4492 4493 if (TUK == TUK_Definition) 4494 New->startDefinition(); 4495 4496 // If this has an identifier, add it to the scope stack. 4497 if (TUK == TUK_Friend) { 4498 // We might be replacing an existing declaration in the lookup tables; 4499 // if so, borrow its access specifier. 4500 if (PrevDecl) 4501 New->setAccess(PrevDecl->getAccess()); 4502 4503 // Friend tag decls are visible in fairly strange ways. 4504 if (!CurContext->isDependentContext()) { 4505 DeclContext *DC = New->getDeclContext()->getLookupContext(); 4506 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 4507 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4508 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 4509 } 4510 } else if (Name) { 4511 S = getNonFieldDeclScope(S); 4512 PushOnScopeChains(New, S); 4513 } else { 4514 CurContext->addDecl(New); 4515 } 4516 4517 // If this is the C FILE type, notify the AST context. 4518 if (IdentifierInfo *II = New->getIdentifier()) 4519 if (!New->isInvalidDecl() && 4520 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 4521 II->isStr("FILE")) 4522 Context.setFILEDecl(New); 4523 4524 OwnedDecl = true; 4525 return DeclPtrTy::make(New); 4526} 4527 4528void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 4529 AdjustDeclIfTemplate(TagD); 4530 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 4531 4532 // Enter the tag context. 4533 PushDeclContext(S, Tag); 4534 4535 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 4536 FieldCollector->StartClass(); 4537 4538 if (Record->getIdentifier()) { 4539 // C++ [class]p2: 4540 // [...] The class-name is also inserted into the scope of the 4541 // class itself; this is known as the injected-class-name. For 4542 // purposes of access checking, the injected-class-name is treated 4543 // as if it were a public member name. 4544 CXXRecordDecl *InjectedClassName 4545 = CXXRecordDecl::Create(Context, Record->getTagKind(), 4546 CurContext, Record->getLocation(), 4547 Record->getIdentifier(), 4548 Record->getTagKeywordLoc(), 4549 Record); 4550 InjectedClassName->setImplicit(); 4551 InjectedClassName->setAccess(AS_public); 4552 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 4553 InjectedClassName->setDescribedClassTemplate(Template); 4554 PushOnScopeChains(InjectedClassName, S); 4555 assert(InjectedClassName->isInjectedClassName() && 4556 "Broken injected-class-name"); 4557 } 4558 } 4559} 4560 4561void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 4562 SourceLocation RBraceLoc) { 4563 AdjustDeclIfTemplate(TagD); 4564 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 4565 Tag->setRBraceLoc(RBraceLoc); 4566 4567 if (isa<CXXRecordDecl>(Tag)) 4568 FieldCollector->FinishClass(); 4569 4570 // Exit this scope of this tag's definition. 4571 PopDeclContext(); 4572 4573 // Notify the consumer that we've defined a tag. 4574 Consumer.HandleTagDeclDefinition(Tag); 4575} 4576 4577// Note that FieldName may be null for anonymous bitfields. 4578bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 4579 QualType FieldTy, const Expr *BitWidth, 4580 bool *ZeroWidth) { 4581 // Default to true; that shouldn't confuse checks for emptiness 4582 if (ZeroWidth) 4583 *ZeroWidth = true; 4584 4585 // C99 6.7.2.1p4 - verify the field type. 4586 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 4587 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 4588 // Handle incomplete types with specific error. 4589 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 4590 return true; 4591 if (FieldName) 4592 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 4593 << FieldName << FieldTy << BitWidth->getSourceRange(); 4594 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 4595 << FieldTy << BitWidth->getSourceRange(); 4596 } 4597 4598 // If the bit-width is type- or value-dependent, don't try to check 4599 // it now. 4600 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 4601 return false; 4602 4603 llvm::APSInt Value; 4604 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 4605 return true; 4606 4607 if (Value != 0 && ZeroWidth) 4608 *ZeroWidth = false; 4609 4610 // Zero-width bitfield is ok for anonymous field. 4611 if (Value == 0 && FieldName) 4612 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 4613 4614 if (Value.isSigned() && Value.isNegative()) { 4615 if (FieldName) 4616 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 4617 << FieldName << Value.toString(10); 4618 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 4619 << Value.toString(10); 4620 } 4621 4622 if (!FieldTy->isDependentType()) { 4623 uint64_t TypeSize = Context.getTypeSize(FieldTy); 4624 if (Value.getZExtValue() > TypeSize) { 4625 if (FieldName) 4626 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 4627 << FieldName << (unsigned)TypeSize; 4628 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 4629 << (unsigned)TypeSize; 4630 } 4631 } 4632 4633 return false; 4634} 4635 4636/// ActOnField - Each field of a struct/union/class is passed into this in order 4637/// to create a FieldDecl object for it. 4638Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 4639 SourceLocation DeclStart, 4640 Declarator &D, ExprTy *BitfieldWidth) { 4641 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 4642 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 4643 AS_public); 4644 return DeclPtrTy::make(Res); 4645} 4646 4647/// HandleField - Analyze a field of a C struct or a C++ data member. 4648/// 4649FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 4650 SourceLocation DeclStart, 4651 Declarator &D, Expr *BitWidth, 4652 AccessSpecifier AS) { 4653 IdentifierInfo *II = D.getIdentifier(); 4654 SourceLocation Loc = DeclStart; 4655 if (II) Loc = D.getIdentifierLoc(); 4656 4657 DeclaratorInfo *DInfo = 0; 4658 QualType T = GetTypeForDeclarator(D, S, &DInfo); 4659 if (getLangOptions().CPlusPlus) 4660 CheckExtraCXXDefaultArguments(D); 4661 4662 DiagnoseFunctionSpecifiers(D); 4663 4664 if (D.getDeclSpec().isThreadSpecified()) 4665 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4666 4667 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 4668 4669 if (PrevDecl && PrevDecl->isTemplateParameter()) { 4670 // Maybe we will complain about the shadowed template parameter. 4671 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4672 // Just pretend that we didn't see the previous declaration. 4673 PrevDecl = 0; 4674 } 4675 4676 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 4677 PrevDecl = 0; 4678 4679 bool Mutable 4680 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 4681 SourceLocation TSSL = D.getSourceRange().getBegin(); 4682 FieldDecl *NewFD 4683 = CheckFieldDecl(II, T, DInfo, Record, Loc, Mutable, BitWidth, TSSL, 4684 AS, PrevDecl, &D); 4685 if (NewFD->isInvalidDecl() && PrevDecl) { 4686 // Don't introduce NewFD into scope; there's already something 4687 // with the same name in the same scope. 4688 } else if (II) { 4689 PushOnScopeChains(NewFD, S); 4690 } else 4691 Record->addDecl(NewFD); 4692 4693 return NewFD; 4694} 4695 4696/// \brief Build a new FieldDecl and check its well-formedness. 4697/// 4698/// This routine builds a new FieldDecl given the fields name, type, 4699/// record, etc. \p PrevDecl should refer to any previous declaration 4700/// with the same name and in the same scope as the field to be 4701/// created. 4702/// 4703/// \returns a new FieldDecl. 4704/// 4705/// \todo The Declarator argument is a hack. It will be removed once 4706FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 4707 DeclaratorInfo *DInfo, 4708 RecordDecl *Record, SourceLocation Loc, 4709 bool Mutable, Expr *BitWidth, 4710 SourceLocation TSSL, 4711 AccessSpecifier AS, NamedDecl *PrevDecl, 4712 Declarator *D) { 4713 IdentifierInfo *II = Name.getAsIdentifierInfo(); 4714 bool InvalidDecl = false; 4715 if (D) InvalidDecl = D->isInvalidType(); 4716 4717 // If we receive a broken type, recover by assuming 'int' and 4718 // marking this declaration as invalid. 4719 if (T.isNull()) { 4720 InvalidDecl = true; 4721 T = Context.IntTy; 4722 } 4723 4724 // C99 6.7.2.1p8: A member of a structure or union may have any type other 4725 // than a variably modified type. 4726 if (T->isVariablyModifiedType()) { 4727 bool SizeIsNegative; 4728 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 4729 SizeIsNegative); 4730 if (!FixedTy.isNull()) { 4731 Diag(Loc, diag::warn_illegal_constant_array_size); 4732 T = FixedTy; 4733 } else { 4734 if (SizeIsNegative) 4735 Diag(Loc, diag::err_typecheck_negative_array_size); 4736 else 4737 Diag(Loc, diag::err_typecheck_field_variable_size); 4738 InvalidDecl = true; 4739 } 4740 } 4741 4742 // Fields can not have abstract class types 4743 if (RequireNonAbstractType(Loc, T, diag::err_abstract_type_in_decl, 4744 AbstractFieldType)) 4745 InvalidDecl = true; 4746 4747 bool ZeroWidth = false; 4748 // If this is declared as a bit-field, check the bit-field. 4749 if (BitWidth && VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 4750 InvalidDecl = true; 4751 DeleteExpr(BitWidth); 4752 BitWidth = 0; 4753 ZeroWidth = false; 4754 } 4755 4756 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, DInfo, 4757 BitWidth, Mutable); 4758 if (InvalidDecl) 4759 NewFD->setInvalidDecl(); 4760 4761 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 4762 Diag(Loc, diag::err_duplicate_member) << II; 4763 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4764 NewFD->setInvalidDecl(); 4765 } 4766 4767 if (getLangOptions().CPlusPlus) { 4768 QualType EltTy = Context.getBaseElementType(T); 4769 4770 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 4771 4772 if (!T->isPODType()) 4773 CXXRecord->setPOD(false); 4774 if (!ZeroWidth) 4775 CXXRecord->setEmpty(false); 4776 4777 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 4778 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 4779 4780 if (!RDecl->hasTrivialConstructor()) 4781 CXXRecord->setHasTrivialConstructor(false); 4782 if (!RDecl->hasTrivialCopyConstructor()) 4783 CXXRecord->setHasTrivialCopyConstructor(false); 4784 if (!RDecl->hasTrivialCopyAssignment()) 4785 CXXRecord->setHasTrivialCopyAssignment(false); 4786 if (!RDecl->hasTrivialDestructor()) 4787 CXXRecord->setHasTrivialDestructor(false); 4788 4789 // C++ 9.5p1: An object of a class with a non-trivial 4790 // constructor, a non-trivial copy constructor, a non-trivial 4791 // destructor, or a non-trivial copy assignment operator 4792 // cannot be a member of a union, nor can an array of such 4793 // objects. 4794 // TODO: C++0x alters this restriction significantly. 4795 if (Record->isUnion()) { 4796 // We check for copy constructors before constructors 4797 // because otherwise we'll never get complaints about 4798 // copy constructors. 4799 4800 const CXXSpecialMember invalid = (CXXSpecialMember) -1; 4801 4802 CXXSpecialMember member; 4803 if (!RDecl->hasTrivialCopyConstructor()) 4804 member = CXXCopyConstructor; 4805 else if (!RDecl->hasTrivialConstructor()) 4806 member = CXXDefaultConstructor; 4807 else if (!RDecl->hasTrivialCopyAssignment()) 4808 member = CXXCopyAssignment; 4809 else if (!RDecl->hasTrivialDestructor()) 4810 member = CXXDestructor; 4811 else 4812 member = invalid; 4813 4814 if (member != invalid) { 4815 Diag(Loc, diag::err_illegal_union_member) << Name << member; 4816 DiagnoseNontrivial(RT, member); 4817 NewFD->setInvalidDecl(); 4818 } 4819 } 4820 } 4821 } 4822 4823 // FIXME: We need to pass in the attributes given an AST 4824 // representation, not a parser representation. 4825 if (D) 4826 // FIXME: What to pass instead of TUScope? 4827 ProcessDeclAttributes(TUScope, NewFD, *D); 4828 4829 if (T.isObjCGCWeak()) 4830 Diag(Loc, diag::warn_attribute_weak_on_field); 4831 4832 NewFD->setAccess(AS); 4833 4834 // C++ [dcl.init.aggr]p1: 4835 // An aggregate is an array or a class (clause 9) with [...] no 4836 // private or protected non-static data members (clause 11). 4837 // A POD must be an aggregate. 4838 if (getLangOptions().CPlusPlus && 4839 (AS == AS_private || AS == AS_protected)) { 4840 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 4841 CXXRecord->setAggregate(false); 4842 CXXRecord->setPOD(false); 4843 } 4844 4845 return NewFD; 4846} 4847 4848/// DiagnoseNontrivial - Given that a class has a non-trivial 4849/// special member, figure out why. 4850void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 4851 QualType QT(T, 0U); 4852 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 4853 4854 // Check whether the member was user-declared. 4855 switch (member) { 4856 case CXXDefaultConstructor: 4857 if (RD->hasUserDeclaredConstructor()) { 4858 typedef CXXRecordDecl::ctor_iterator ctor_iter; 4859 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce; ++ci) 4860 if (!ci->isImplicitlyDefined(Context)) { 4861 SourceLocation CtorLoc = ci->getLocation(); 4862 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 4863 return; 4864 } 4865 4866 assert(0 && "found no user-declared constructors"); 4867 return; 4868 } 4869 break; 4870 4871 case CXXCopyConstructor: 4872 if (RD->hasUserDeclaredCopyConstructor()) { 4873 SourceLocation CtorLoc = 4874 RD->getCopyConstructor(Context, 0)->getLocation(); 4875 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 4876 return; 4877 } 4878 break; 4879 4880 case CXXCopyAssignment: 4881 if (RD->hasUserDeclaredCopyAssignment()) { 4882 // FIXME: this should use the location of the copy 4883 // assignment, not the type. 4884 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 4885 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 4886 return; 4887 } 4888 break; 4889 4890 case CXXDestructor: 4891 if (RD->hasUserDeclaredDestructor()) { 4892 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation(); 4893 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 4894 return; 4895 } 4896 break; 4897 } 4898 4899 typedef CXXRecordDecl::base_class_iterator base_iter; 4900 4901 // Virtual bases and members inhibit trivial copying/construction, 4902 // but not trivial destruction. 4903 if (member != CXXDestructor) { 4904 // Check for virtual bases. vbases includes indirect virtual bases, 4905 // so we just iterate through the direct bases. 4906 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 4907 if (bi->isVirtual()) { 4908 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 4909 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 4910 return; 4911 } 4912 4913 // Check for virtual methods. 4914 typedef CXXRecordDecl::method_iterator meth_iter; 4915 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 4916 ++mi) { 4917 if (mi->isVirtual()) { 4918 SourceLocation MLoc = mi->getSourceRange().getBegin(); 4919 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 4920 return; 4921 } 4922 } 4923 } 4924 4925 bool (CXXRecordDecl::*hasTrivial)() const; 4926 switch (member) { 4927 case CXXDefaultConstructor: 4928 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 4929 case CXXCopyConstructor: 4930 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 4931 case CXXCopyAssignment: 4932 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 4933 case CXXDestructor: 4934 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 4935 default: 4936 assert(0 && "unexpected special member"); return; 4937 } 4938 4939 // Check for nontrivial bases (and recurse). 4940 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 4941 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 4942 assert(BaseRT); 4943 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 4944 if (!(BaseRecTy->*hasTrivial)()) { 4945 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 4946 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 4947 DiagnoseNontrivial(BaseRT, member); 4948 return; 4949 } 4950 } 4951 4952 // Check for nontrivial members (and recurse). 4953 typedef RecordDecl::field_iterator field_iter; 4954 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 4955 ++fi) { 4956 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 4957 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 4958 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 4959 4960 if (!(EltRD->*hasTrivial)()) { 4961 SourceLocation FLoc = (*fi)->getLocation(); 4962 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 4963 DiagnoseNontrivial(EltRT, member); 4964 return; 4965 } 4966 } 4967 } 4968 4969 assert(0 && "found no explanation for non-trivial member"); 4970} 4971 4972/// TranslateIvarVisibility - Translate visibility from a token ID to an 4973/// AST enum value. 4974static ObjCIvarDecl::AccessControl 4975TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 4976 switch (ivarVisibility) { 4977 default: assert(0 && "Unknown visitibility kind"); 4978 case tok::objc_private: return ObjCIvarDecl::Private; 4979 case tok::objc_public: return ObjCIvarDecl::Public; 4980 case tok::objc_protected: return ObjCIvarDecl::Protected; 4981 case tok::objc_package: return ObjCIvarDecl::Package; 4982 } 4983} 4984 4985/// ActOnIvar - Each ivar field of an objective-c class is passed into this 4986/// in order to create an IvarDecl object for it. 4987Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 4988 SourceLocation DeclStart, 4989 DeclPtrTy IntfDecl, 4990 Declarator &D, ExprTy *BitfieldWidth, 4991 tok::ObjCKeywordKind Visibility) { 4992 4993 IdentifierInfo *II = D.getIdentifier(); 4994 Expr *BitWidth = (Expr*)BitfieldWidth; 4995 SourceLocation Loc = DeclStart; 4996 if (II) Loc = D.getIdentifierLoc(); 4997 4998 // FIXME: Unnamed fields can be handled in various different ways, for 4999 // example, unnamed unions inject all members into the struct namespace! 5000 5001 DeclaratorInfo *DInfo = 0; 5002 QualType T = GetTypeForDeclarator(D, S, &DInfo); 5003 5004 if (BitWidth) { 5005 // 6.7.2.1p3, 6.7.2.1p4 5006 if (VerifyBitField(Loc, II, T, BitWidth)) { 5007 D.setInvalidType(); 5008 DeleteExpr(BitWidth); 5009 BitWidth = 0; 5010 } 5011 } else { 5012 // Not a bitfield. 5013 5014 // validate II. 5015 5016 } 5017 5018 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5019 // than a variably modified type. 5020 if (T->isVariablyModifiedType()) { 5021 Diag(Loc, diag::err_typecheck_ivar_variable_size); 5022 D.setInvalidType(); 5023 } 5024 5025 // Get the visibility (access control) for this ivar. 5026 ObjCIvarDecl::AccessControl ac = 5027 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 5028 : ObjCIvarDecl::None; 5029 // Must set ivar's DeclContext to its enclosing interface. 5030 Decl *EnclosingDecl = IntfDecl.getAs<Decl>(); 5031 DeclContext *EnclosingContext; 5032 if (ObjCImplementationDecl *IMPDecl = 5033 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5034 // Case of ivar declared in an implementation. Context is that of its class. 5035 ObjCInterfaceDecl* IDecl = IMPDecl->getClassInterface(); 5036 assert(IDecl && "No class- ActOnIvar"); 5037 EnclosingContext = cast_or_null<DeclContext>(IDecl); 5038 } else 5039 EnclosingContext = dyn_cast<DeclContext>(EnclosingDecl); 5040 assert(EnclosingContext && "null DeclContext for ivar - ActOnIvar"); 5041 5042 // Construct the decl. 5043 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 5044 EnclosingContext, Loc, II, T, 5045 DInfo, ac, (Expr *)BitfieldWidth); 5046 5047 if (II) { 5048 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 5049 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 5050 && !isa<TagDecl>(PrevDecl)) { 5051 Diag(Loc, diag::err_duplicate_member) << II; 5052 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5053 NewID->setInvalidDecl(); 5054 } 5055 } 5056 5057 // Process attributes attached to the ivar. 5058 ProcessDeclAttributes(S, NewID, D); 5059 5060 if (D.isInvalidType()) 5061 NewID->setInvalidDecl(); 5062 5063 if (II) { 5064 // FIXME: When interfaces are DeclContexts, we'll need to add 5065 // these to the interface. 5066 S->AddDecl(DeclPtrTy::make(NewID)); 5067 IdResolver.AddDecl(NewID); 5068 } 5069 5070 return DeclPtrTy::make(NewID); 5071} 5072 5073void Sema::ActOnFields(Scope* S, 5074 SourceLocation RecLoc, DeclPtrTy RecDecl, 5075 DeclPtrTy *Fields, unsigned NumFields, 5076 SourceLocation LBrac, SourceLocation RBrac, 5077 AttributeList *Attr) { 5078 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 5079 assert(EnclosingDecl && "missing record or interface decl"); 5080 5081 // If the decl this is being inserted into is invalid, then it may be a 5082 // redeclaration or some other bogus case. Don't try to add fields to it. 5083 if (EnclosingDecl->isInvalidDecl()) { 5084 // FIXME: Deallocate fields? 5085 return; 5086 } 5087 5088 5089 // Verify that all the fields are okay. 5090 unsigned NumNamedMembers = 0; 5091 llvm::SmallVector<FieldDecl*, 32> RecFields; 5092 5093 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 5094 for (unsigned i = 0; i != NumFields; ++i) { 5095 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 5096 5097 // Get the type for the field. 5098 Type *FDTy = FD->getType().getTypePtr(); 5099 5100 if (!FD->isAnonymousStructOrUnion()) { 5101 // Remember all fields written by the user. 5102 RecFields.push_back(FD); 5103 } 5104 5105 // If the field is already invalid for some reason, don't emit more 5106 // diagnostics about it. 5107 if (FD->isInvalidDecl()) 5108 continue; 5109 5110 // C99 6.7.2.1p2: 5111 // A structure or union shall not contain a member with 5112 // incomplete or function type (hence, a structure shall not 5113 // contain an instance of itself, but may contain a pointer to 5114 // an instance of itself), except that the last member of a 5115 // structure with more than one named member may have incomplete 5116 // array type; such a structure (and any union containing, 5117 // possibly recursively, a member that is such a structure) 5118 // shall not be a member of a structure or an element of an 5119 // array. 5120 if (FDTy->isFunctionType()) { 5121 // Field declared as a function. 5122 Diag(FD->getLocation(), diag::err_field_declared_as_function) 5123 << FD->getDeclName(); 5124 FD->setInvalidDecl(); 5125 EnclosingDecl->setInvalidDecl(); 5126 continue; 5127 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 5128 Record && Record->isStruct()) { 5129 // Flexible array member. 5130 if (NumNamedMembers < 1) { 5131 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 5132 << FD->getDeclName(); 5133 FD->setInvalidDecl(); 5134 EnclosingDecl->setInvalidDecl(); 5135 continue; 5136 } 5137 // Okay, we have a legal flexible array member at the end of the struct. 5138 if (Record) 5139 Record->setHasFlexibleArrayMember(true); 5140 } else if (!FDTy->isDependentType() && 5141 RequireCompleteType(FD->getLocation(), FD->getType(), 5142 diag::err_field_incomplete)) { 5143 // Incomplete type 5144 FD->setInvalidDecl(); 5145 EnclosingDecl->setInvalidDecl(); 5146 continue; 5147 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 5148 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 5149 // If this is a member of a union, then entire union becomes "flexible". 5150 if (Record && Record->isUnion()) { 5151 Record->setHasFlexibleArrayMember(true); 5152 } else { 5153 // If this is a struct/class and this is not the last element, reject 5154 // it. Note that GCC supports variable sized arrays in the middle of 5155 // structures. 5156 if (i != NumFields-1) 5157 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 5158 << FD->getDeclName() << FD->getType(); 5159 else { 5160 // We support flexible arrays at the end of structs in 5161 // other structs as an extension. 5162 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 5163 << FD->getDeclName(); 5164 if (Record) 5165 Record->setHasFlexibleArrayMember(true); 5166 } 5167 } 5168 } 5169 if (Record && FDTTy->getDecl()->hasObjectMember()) 5170 Record->setHasObjectMember(true); 5171 } else if (FDTy->isObjCInterfaceType()) { 5172 /// A field cannot be an Objective-c object 5173 Diag(FD->getLocation(), diag::err_statically_allocated_object); 5174 FD->setInvalidDecl(); 5175 EnclosingDecl->setInvalidDecl(); 5176 continue; 5177 } else if (getLangOptions().ObjC1 && 5178 getLangOptions().getGCMode() != LangOptions::NonGC && 5179 Record && 5180 (FD->getType()->isObjCObjectPointerType() || 5181 FD->getType().isObjCGCStrong())) 5182 Record->setHasObjectMember(true); 5183 // Keep track of the number of named members. 5184 if (FD->getIdentifier()) 5185 ++NumNamedMembers; 5186 } 5187 5188 // Okay, we successfully defined 'Record'. 5189 if (Record) { 5190 Record->completeDefinition(Context); 5191 } else { 5192 ObjCIvarDecl **ClsFields = 5193 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 5194 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 5195 ID->setIVarList(ClsFields, RecFields.size(), Context); 5196 ID->setLocEnd(RBrac); 5197 // Add ivar's to class's DeclContext. 5198 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5199 ClsFields[i]->setLexicalDeclContext(ID); 5200 ID->addDecl(ClsFields[i]); 5201 } 5202 // Must enforce the rule that ivars in the base classes may not be 5203 // duplicates. 5204 if (ID->getSuperClass()) { 5205 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 5206 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 5207 ObjCIvarDecl* Ivar = (*IVI); 5208 5209 if (IdentifierInfo *II = Ivar->getIdentifier()) { 5210 ObjCIvarDecl* prevIvar = 5211 ID->getSuperClass()->lookupInstanceVariable(II); 5212 if (prevIvar) { 5213 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 5214 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 5215 } 5216 } 5217 } 5218 } 5219 } else if (ObjCImplementationDecl *IMPDecl = 5220 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5221 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 5222 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 5223 // Ivar declared in @implementation never belongs to the implementation. 5224 // Only it is in implementation's lexical context. 5225 ClsFields[I]->setLexicalDeclContext(IMPDecl); 5226 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 5227 } 5228 } 5229 5230 if (Attr) 5231 ProcessDeclAttributeList(S, Record, Attr); 5232} 5233 5234EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 5235 EnumConstantDecl *LastEnumConst, 5236 SourceLocation IdLoc, 5237 IdentifierInfo *Id, 5238 ExprArg val) { 5239 Expr *Val = (Expr *)val.get(); 5240 5241 llvm::APSInt EnumVal(32); 5242 QualType EltTy; 5243 if (Val && !Val->isTypeDependent()) { 5244 // Make sure to promote the operand type to int. 5245 UsualUnaryConversions(Val); 5246 if (Val != val.get()) { 5247 val.release(); 5248 val = Val; 5249 } 5250 5251 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 5252 SourceLocation ExpLoc; 5253 if (!Val->isValueDependent() && 5254 VerifyIntegerConstantExpression(Val, &EnumVal)) { 5255 Val = 0; 5256 } else { 5257 EltTy = Val->getType(); 5258 } 5259 } 5260 5261 if (!Val) { 5262 if (LastEnumConst) { 5263 // Assign the last value + 1. 5264 EnumVal = LastEnumConst->getInitVal(); 5265 ++EnumVal; 5266 5267 // Check for overflow on increment. 5268 if (EnumVal < LastEnumConst->getInitVal()) 5269 Diag(IdLoc, diag::warn_enum_value_overflow); 5270 5271 EltTy = LastEnumConst->getType(); 5272 } else { 5273 // First value, set to zero. 5274 EltTy = Context.IntTy; 5275 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 5276 } 5277 } 5278 5279 val.release(); 5280 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 5281 Val, EnumVal); 5282} 5283 5284 5285Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 5286 DeclPtrTy lastEnumConst, 5287 SourceLocation IdLoc, 5288 IdentifierInfo *Id, 5289 SourceLocation EqualLoc, ExprTy *val) { 5290 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 5291 EnumConstantDecl *LastEnumConst = 5292 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 5293 Expr *Val = static_cast<Expr*>(val); 5294 5295 // The scope passed in may not be a decl scope. Zip up the scope tree until 5296 // we find one that is. 5297 S = getNonFieldDeclScope(S); 5298 5299 // Verify that there isn't already something declared with this name in this 5300 // scope. 5301 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 5302 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5303 // Maybe we will complain about the shadowed template parameter. 5304 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 5305 // Just pretend that we didn't see the previous declaration. 5306 PrevDecl = 0; 5307 } 5308 5309 if (PrevDecl) { 5310 // When in C++, we may get a TagDecl with the same name; in this case the 5311 // enum constant will 'hide' the tag. 5312 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 5313 "Received TagDecl when not in C++!"); 5314 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 5315 if (isa<EnumConstantDecl>(PrevDecl)) 5316 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 5317 else 5318 Diag(IdLoc, diag::err_redefinition) << Id; 5319 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5320 if (Val) Val->Destroy(Context); 5321 return DeclPtrTy(); 5322 } 5323 } 5324 5325 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 5326 IdLoc, Id, Owned(Val)); 5327 5328 // Register this decl in the current scope stack. 5329 if (New) 5330 PushOnScopeChains(New, S); 5331 5332 return DeclPtrTy::make(New); 5333} 5334 5335void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 5336 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 5337 DeclPtrTy *Elements, unsigned NumElements, 5338 Scope *S, AttributeList *Attr) { 5339 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 5340 QualType EnumType = Context.getTypeDeclType(Enum); 5341 5342 if (Attr) 5343 ProcessDeclAttributeList(S, Enum, Attr); 5344 5345 // TODO: If the result value doesn't fit in an int, it must be a long or long 5346 // long value. ISO C does not support this, but GCC does as an extension, 5347 // emit a warning. 5348 unsigned IntWidth = Context.Target.getIntWidth(); 5349 unsigned CharWidth = Context.Target.getCharWidth(); 5350 unsigned ShortWidth = Context.Target.getShortWidth(); 5351 5352 // Verify that all the values are okay, compute the size of the values, and 5353 // reverse the list. 5354 unsigned NumNegativeBits = 0; 5355 unsigned NumPositiveBits = 0; 5356 5357 // Keep track of whether all elements have type int. 5358 bool AllElementsInt = true; 5359 5360 for (unsigned i = 0; i != NumElements; ++i) { 5361 EnumConstantDecl *ECD = 5362 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5363 if (!ECD) continue; // Already issued a diagnostic. 5364 5365 // If the enum value doesn't fit in an int, emit an extension warning. 5366 const llvm::APSInt &InitVal = ECD->getInitVal(); 5367 assert(InitVal.getBitWidth() >= IntWidth && 5368 "Should have promoted value to int"); 5369 if (InitVal.getBitWidth() > IntWidth) { 5370 llvm::APSInt V(InitVal); 5371 V.trunc(IntWidth); 5372 V.extend(InitVal.getBitWidth()); 5373 if (V != InitVal) 5374 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 5375 << InitVal.toString(10); 5376 } 5377 5378 // Keep track of the size of positive and negative values. 5379 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 5380 NumPositiveBits = std::max(NumPositiveBits, 5381 (unsigned)InitVal.getActiveBits()); 5382 else 5383 NumNegativeBits = std::max(NumNegativeBits, 5384 (unsigned)InitVal.getMinSignedBits()); 5385 5386 // Keep track of whether every enum element has type int (very commmon). 5387 if (AllElementsInt) 5388 AllElementsInt = ECD->getType() == Context.IntTy; 5389 } 5390 5391 // Figure out the type that should be used for this enum. 5392 // FIXME: Support -fshort-enums. 5393 QualType BestType; 5394 unsigned BestWidth; 5395 5396 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 5397 5398 if (NumNegativeBits) { 5399 // If there is a negative value, figure out the smallest integer type (of 5400 // int/long/longlong) that fits. 5401 // If it's packed, check also if it fits a char or a short. 5402 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 5403 BestType = Context.SignedCharTy; 5404 BestWidth = CharWidth; 5405 } else if (Packed && NumNegativeBits <= ShortWidth && 5406 NumPositiveBits < ShortWidth) { 5407 BestType = Context.ShortTy; 5408 BestWidth = ShortWidth; 5409 } 5410 else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 5411 BestType = Context.IntTy; 5412 BestWidth = IntWidth; 5413 } else { 5414 BestWidth = Context.Target.getLongWidth(); 5415 5416 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 5417 BestType = Context.LongTy; 5418 else { 5419 BestWidth = Context.Target.getLongLongWidth(); 5420 5421 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 5422 Diag(Enum->getLocation(), diag::warn_enum_too_large); 5423 BestType = Context.LongLongTy; 5424 } 5425 } 5426 } else { 5427 // If there is no negative value, figure out which of uint, ulong, ulonglong 5428 // fits. 5429 // If it's packed, check also if it fits a char or a short. 5430 if (Packed && NumPositiveBits <= CharWidth) { 5431 BestType = Context.UnsignedCharTy; 5432 BestWidth = CharWidth; 5433 } else if (Packed && NumPositiveBits <= ShortWidth) { 5434 BestType = Context.UnsignedShortTy; 5435 BestWidth = ShortWidth; 5436 } 5437 else if (NumPositiveBits <= IntWidth) { 5438 BestType = Context.UnsignedIntTy; 5439 BestWidth = IntWidth; 5440 } else if (NumPositiveBits <= 5441 (BestWidth = Context.Target.getLongWidth())) { 5442 BestType = Context.UnsignedLongTy; 5443 } else { 5444 BestWidth = Context.Target.getLongLongWidth(); 5445 assert(NumPositiveBits <= BestWidth && 5446 "How could an initializer get larger than ULL?"); 5447 BestType = Context.UnsignedLongLongTy; 5448 } 5449 } 5450 5451 // Loop over all of the enumerator constants, changing their types to match 5452 // the type of the enum if needed. 5453 for (unsigned i = 0; i != NumElements; ++i) { 5454 EnumConstantDecl *ECD = 5455 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5456 if (!ECD) continue; // Already issued a diagnostic. 5457 5458 // Standard C says the enumerators have int type, but we allow, as an 5459 // extension, the enumerators to be larger than int size. If each 5460 // enumerator value fits in an int, type it as an int, otherwise type it the 5461 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 5462 // that X has type 'int', not 'unsigned'. 5463 if (ECD->getType() == Context.IntTy) { 5464 // Make sure the init value is signed. 5465 llvm::APSInt IV = ECD->getInitVal(); 5466 IV.setIsSigned(true); 5467 ECD->setInitVal(IV); 5468 5469 if (getLangOptions().CPlusPlus) 5470 // C++ [dcl.enum]p4: Following the closing brace of an 5471 // enum-specifier, each enumerator has the type of its 5472 // enumeration. 5473 ECD->setType(EnumType); 5474 continue; // Already int type. 5475 } 5476 5477 // Determine whether the value fits into an int. 5478 llvm::APSInt InitVal = ECD->getInitVal(); 5479 bool FitsInInt; 5480 if (InitVal.isUnsigned() || !InitVal.isNegative()) 5481 FitsInInt = InitVal.getActiveBits() < IntWidth; 5482 else 5483 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 5484 5485 // If it fits into an integer type, force it. Otherwise force it to match 5486 // the enum decl type. 5487 QualType NewTy; 5488 unsigned NewWidth; 5489 bool NewSign; 5490 if (FitsInInt) { 5491 NewTy = Context.IntTy; 5492 NewWidth = IntWidth; 5493 NewSign = true; 5494 } else if (ECD->getType() == BestType) { 5495 // Already the right type! 5496 if (getLangOptions().CPlusPlus) 5497 // C++ [dcl.enum]p4: Following the closing brace of an 5498 // enum-specifier, each enumerator has the type of its 5499 // enumeration. 5500 ECD->setType(EnumType); 5501 continue; 5502 } else { 5503 NewTy = BestType; 5504 NewWidth = BestWidth; 5505 NewSign = BestType->isSignedIntegerType(); 5506 } 5507 5508 // Adjust the APSInt value. 5509 InitVal.extOrTrunc(NewWidth); 5510 InitVal.setIsSigned(NewSign); 5511 ECD->setInitVal(InitVal); 5512 5513 // Adjust the Expr initializer and type. 5514 if (ECD->getInitExpr()) 5515 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, 5516 CastExpr::CK_Unknown, 5517 ECD->getInitExpr(), 5518 /*isLvalue=*/false)); 5519 if (getLangOptions().CPlusPlus) 5520 // C++ [dcl.enum]p4: Following the closing brace of an 5521 // enum-specifier, each enumerator has the type of its 5522 // enumeration. 5523 ECD->setType(EnumType); 5524 else 5525 ECD->setType(NewTy); 5526 } 5527 5528 Enum->completeDefinition(Context, BestType); 5529} 5530 5531Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 5532 ExprArg expr) { 5533 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 5534 5535 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 5536 Loc, AsmString); 5537 CurContext->addDecl(New); 5538 return DeclPtrTy::make(New); 5539} 5540 5541void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 5542 SourceLocation PragmaLoc, 5543 SourceLocation NameLoc) { 5544 Decl *PrevDecl = LookupName(TUScope, Name, LookupOrdinaryName); 5545 5546 if (PrevDecl) { 5547 PrevDecl->addAttr(::new (Context) WeakAttr()); 5548 } else { 5549 (void)WeakUndeclaredIdentifiers.insert( 5550 std::pair<IdentifierInfo*,WeakInfo> 5551 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 5552 } 5553} 5554 5555void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 5556 IdentifierInfo* AliasName, 5557 SourceLocation PragmaLoc, 5558 SourceLocation NameLoc, 5559 SourceLocation AliasNameLoc) { 5560 Decl *PrevDecl = LookupName(TUScope, AliasName, LookupOrdinaryName); 5561 WeakInfo W = WeakInfo(Name, NameLoc); 5562 5563 if (PrevDecl) { 5564 if (!PrevDecl->hasAttr<AliasAttr>()) 5565 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 5566 DeclApplyPragmaWeak(TUScope, ND, W); 5567 } else { 5568 (void)WeakUndeclaredIdentifiers.insert( 5569 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 5570 } 5571} 5572