SemaDecl.cpp revision 6ed40e351a7c1fb3084434f1db19216b79623cf0
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/APValue.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclObjC.h" 19#include "clang/AST/ExprCXX.h" 20#include "clang/Parse/DeclSpec.h" 21#include "clang/Basic/Diagnostic.h" 22#include "clang/Basic/TargetInfo.h" 23#include "clang/Basic/SourceManager.h" 24// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 25#include "clang/Lex/Preprocessor.h" 26#include "clang/Lex/HeaderSearch.h" 27#include "llvm/ADT/SmallSet.h" 28#include "llvm/ADT/STLExtras.h" 29#include <algorithm> 30#include <functional> 31 32using namespace clang; 33 34Sema::TypeTy *Sema::isTypeName(IdentifierInfo &II, Scope *S, 35 const CXXScopeSpec *SS) { 36 DeclContext *DC = 0; 37 if (SS) { 38 if (SS->isInvalid()) 39 return 0; 40 DC = static_cast<DeclContext*>(SS->getScopeRep()); 41 } 42 Decl *IIDecl = LookupDecl(&II, Decl::IDNS_Ordinary, S, DC, false); 43 44 if (IIDecl && (isa<TypedefDecl>(IIDecl) || 45 isa<ObjCInterfaceDecl>(IIDecl) || 46 isa<TagDecl>(IIDecl) || 47 isa<TemplateTypeParmDecl>(IIDecl))) 48 return IIDecl; 49 return 0; 50} 51 52DeclContext *Sema::getContainingDC(DeclContext *DC) { 53 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) { 54 // A C++ out-of-line method will return to the file declaration context. 55 if (MD->isOutOfLineDefinition()) 56 return MD->getLexicalDeclContext(); 57 58 // A C++ inline method is parsed *after* the topmost class it was declared in 59 // is fully parsed (it's "complete"). 60 // The parsing of a C++ inline method happens at the declaration context of 61 // the topmost (non-nested) class it is lexically declared in. 62 assert(isa<CXXRecordDecl>(MD->getParent()) && "C++ method not in Record."); 63 DC = MD->getParent(); 64 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 65 DC = RD; 66 67 // Return the declaration context of the topmost class the inline method is 68 // declared in. 69 return DC; 70 } 71 72 if (isa<ObjCMethodDecl>(DC)) 73 return Context.getTranslationUnitDecl(); 74 75 if (ScopedDecl *SD = dyn_cast<ScopedDecl>(DC)) 76 return SD->getLexicalDeclContext(); 77 78 return DC->getLexicalParent(); 79} 80 81void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 82 assert(getContainingDC(DC) == CurContext && 83 "The next DeclContext should be lexically contained in the current one."); 84 CurContext = DC; 85 S->setEntity(DC); 86} 87 88void Sema::PopDeclContext() { 89 assert(CurContext && "DeclContext imbalance!"); 90 91 CurContext = getContainingDC(CurContext); 92} 93 94/// Add this decl to the scope shadowed decl chains. 95void Sema::PushOnScopeChains(NamedDecl *D, Scope *S) { 96 S->AddDecl(D); 97 98 // Add scoped declarations into their context, so that they can be 99 // found later. Declarations without a context won't be inserted 100 // into any context. 101 if (ScopedDecl *SD = dyn_cast<ScopedDecl>(D)) 102 CurContext->addDecl(Context, SD); 103 104 // C++ [basic.scope]p4: 105 // -- exactly one declaration shall declare a class name or 106 // enumeration name that is not a typedef name and the other 107 // declarations shall all refer to the same object or 108 // enumerator, or all refer to functions and function templates; 109 // in this case the class name or enumeration name is hidden. 110 if (TagDecl *TD = dyn_cast<TagDecl>(D)) { 111 // We are pushing the name of a tag (enum or class). 112 if (CurContext == TD->getDeclContext()) { 113 // We're pushing the tag into the current context, which might 114 // require some reshuffling in the identifier resolver. 115 IdentifierResolver::iterator 116 I = IdResolver.begin(TD->getDeclName(), CurContext, 117 false/*LookInParentCtx*/), 118 IEnd = IdResolver.end(); 119 if (I != IEnd && isDeclInScope(*I, CurContext, S)) { 120 NamedDecl *PrevDecl = *I; 121 for (; I != IEnd && isDeclInScope(*I, CurContext, S); 122 PrevDecl = *I, ++I) { 123 if (TD->declarationReplaces(*I)) { 124 // This is a redeclaration. Remove it from the chain and 125 // break out, so that we'll add in the shadowed 126 // declaration. 127 S->RemoveDecl(*I); 128 if (PrevDecl == *I) { 129 IdResolver.RemoveDecl(*I); 130 IdResolver.AddDecl(TD); 131 return; 132 } else { 133 IdResolver.RemoveDecl(*I); 134 break; 135 } 136 } 137 } 138 139 // There is already a declaration with the same name in the same 140 // scope, which is not a tag declaration. It must be found 141 // before we find the new declaration, so insert the new 142 // declaration at the end of the chain. 143 IdResolver.AddShadowedDecl(TD, PrevDecl); 144 145 return; 146 } 147 } 148 } else if (getLangOptions().CPlusPlus && isa<FunctionDecl>(D)) { 149 // We are pushing the name of a function, which might be an 150 // overloaded name. 151 FunctionDecl *FD = cast<FunctionDecl>(D); 152 IdentifierResolver::iterator Redecl 153 = std::find_if(IdResolver.begin(FD->getDeclName(), CurContext, 154 false/*LookInParentCtx*/), 155 IdResolver.end(), 156 std::bind1st(std::mem_fun(&ScopedDecl::declarationReplaces), 157 FD)); 158 if (Redecl != IdResolver.end()) { 159 // There is already a declaration of a function on our 160 // IdResolver chain. Replace it with this declaration. 161 S->RemoveDecl(*Redecl); 162 IdResolver.RemoveDecl(*Redecl); 163 } 164 } 165 166 IdResolver.AddDecl(D); 167} 168 169void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 170 if (S->decl_empty()) return; 171 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 172 "Scope shouldn't contain decls!"); 173 174 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 175 I != E; ++I) { 176 Decl *TmpD = static_cast<Decl*>(*I); 177 assert(TmpD && "This decl didn't get pushed??"); 178 179 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 180 NamedDecl *D = cast<NamedDecl>(TmpD); 181 182 if (!D->getDeclName()) continue; 183 184 // Remove this name from our lexical scope. 185 IdResolver.RemoveDecl(D); 186 } 187} 188 189/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 190/// return 0 if one not found. 191ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 192 // The third "scope" argument is 0 since we aren't enabling lazy built-in 193 // creation from this context. 194 Decl *IDecl = LookupDecl(Id, Decl::IDNS_Ordinary, 0, false); 195 196 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 197} 198 199/// MaybeConstructOverloadSet - Name lookup has determined that the 200/// elements in [I, IEnd) have the name that we are looking for, and 201/// *I is a match for the namespace. This routine returns an 202/// appropriate Decl for name lookup, which may either be *I or an 203/// OverloadeFunctionDecl that represents the overloaded functions in 204/// [I, IEnd). 205/// 206/// The existance of this routine is temporary; LookupDecl should 207/// probably be able to return multiple results, to deal with cases of 208/// ambiguity and overloaded functions without needing to create a 209/// Decl node. 210template<typename DeclIterator> 211static Decl * 212MaybeConstructOverloadSet(ASTContext &Context, 213 DeclIterator I, DeclIterator IEnd) { 214 assert(I != IEnd && "Iterator range cannot be empty"); 215 assert(!isa<OverloadedFunctionDecl>(*I) && 216 "Cannot have an overloaded function"); 217 218 if (isa<FunctionDecl>(*I)) { 219 // If we found a function, there might be more functions. If 220 // so, collect them into an overload set. 221 DeclIterator Last = I; 222 OverloadedFunctionDecl *Ovl = 0; 223 for (++Last; Last != IEnd && isa<FunctionDecl>(*Last); ++Last) { 224 if (!Ovl) { 225 // FIXME: We leak this overload set. Eventually, we want to 226 // stop building the declarations for these overload sets, so 227 // there will be nothing to leak. 228 Ovl = OverloadedFunctionDecl::Create(Context, 229 cast<ScopedDecl>(*I)->getDeclContext(), 230 (*I)->getDeclName()); 231 Ovl->addOverload(cast<FunctionDecl>(*I)); 232 } 233 Ovl->addOverload(cast<FunctionDecl>(*Last)); 234 } 235 236 // If we had more than one function, we built an overload 237 // set. Return it. 238 if (Ovl) 239 return Ovl; 240 } 241 242 return *I; 243} 244 245/// LookupDecl - Look up the inner-most declaration in the specified 246/// namespace. 247Decl *Sema::LookupDecl(DeclarationName Name, unsigned NSI, Scope *S, 248 const DeclContext *LookupCtx, 249 bool enableLazyBuiltinCreation, 250 bool LookInParent) { 251 if (!Name) return 0; 252 unsigned NS = NSI; 253 if (getLangOptions().CPlusPlus && (NS & Decl::IDNS_Ordinary)) 254 NS |= Decl::IDNS_Tag; 255 256 if (LookupCtx == 0 && 257 (!getLangOptions().CPlusPlus || (NS == Decl::IDNS_Label))) { 258 // Unqualified name lookup in C/Objective-C and name lookup for 259 // labels in C++ is purely lexical, so search in the 260 // declarations attached to the name. 261 assert(!LookupCtx && "Can't perform qualified name lookup here"); 262 IdentifierResolver::iterator I 263 = IdResolver.begin(Name, CurContext, LookInParent); 264 265 // Scan up the scope chain looking for a decl that matches this 266 // identifier that is in the appropriate namespace. This search 267 // should not take long, as shadowing of names is uncommon, and 268 // deep shadowing is extremely uncommon. 269 for (; I != IdResolver.end(); ++I) 270 if ((*I)->getIdentifierNamespace() & NS) 271 return *I; 272 } else if (LookupCtx) { 273 // Perform qualified name lookup into the LookupCtx. 274 // FIXME: Will need to look into base classes and such. 275 DeclContext::lookup_const_iterator I, E; 276 for (llvm::tie(I, E) = LookupCtx->lookup(Context, Name); I != E; ++I) 277 if ((*I)->getIdentifierNamespace() & NS) 278 return MaybeConstructOverloadSet(Context, I, E); 279 } else { 280 // Name lookup for ordinary names and tag names in C++ requires 281 // looking into scopes that aren't strictly lexical, and 282 // therefore we walk through the context as well as walking 283 // through the scopes. 284 IdentifierResolver::iterator 285 I = IdResolver.begin(Name, CurContext, true/*LookInParentCtx*/), 286 IEnd = IdResolver.end(); 287 for (; S; S = S->getParent()) { 288 // Check whether the IdResolver has anything in this scope. 289 // FIXME: The isDeclScope check could be expensive. Can we do better? 290 for (; I != IEnd && S->isDeclScope(*I); ++I) { 291 if ((*I)->getIdentifierNamespace() & NS) { 292 // We found something. Look for anything else in our scope 293 // with this same name and in an acceptable identifier 294 // namespace, so that we can construct an overload set if we 295 // need to. 296 IdentifierResolver::iterator LastI = I; 297 for (++LastI; LastI != IEnd; ++LastI) { 298 if (((*LastI)->getIdentifierNamespace() & NS) == 0 || 299 !S->isDeclScope(*LastI)) 300 break; 301 } 302 return MaybeConstructOverloadSet(Context, I, LastI); 303 } 304 } 305 306 // If there is an entity associated with this scope, it's a 307 // DeclContext. We might need to perform qualified lookup into 308 // it. 309 DeclContext *Ctx = static_cast<DeclContext *>(S->getEntity()); 310 while (Ctx && Ctx->isFunctionOrMethod()) 311 Ctx = Ctx->getParent(); 312 while (Ctx && (Ctx->isNamespace() || Ctx->isCXXRecord())) { 313 // Look for declarations of this name in this scope. 314 DeclContext::lookup_const_iterator I, E; 315 for (llvm::tie(I, E) = Ctx->lookup(Context, Name); I != E; ++I) { 316 // FIXME: Cache this result in the IdResolver 317 if ((*I)->getIdentifierNamespace() & NS) 318 return MaybeConstructOverloadSet(Context, I, E); 319 } 320 321 Ctx = Ctx->getParent(); 322 } 323 324 if (!LookInParent) 325 return 0; 326 } 327 } 328 329 // If we didn't find a use of this identifier, and if the identifier 330 // corresponds to a compiler builtin, create the decl object for the builtin 331 // now, injecting it into translation unit scope, and return it. 332 if (NS & Decl::IDNS_Ordinary) { 333 IdentifierInfo *II = Name.getAsIdentifierInfo(); 334 if (enableLazyBuiltinCreation && II && 335 (LookupCtx == 0 || isa<TranslationUnitDecl>(LookupCtx))) { 336 // If this is a builtin on this (or all) targets, create the decl. 337 if (unsigned BuiltinID = II->getBuiltinID()) 338 return LazilyCreateBuiltin((IdentifierInfo *)II, BuiltinID, S); 339 } 340 if (getLangOptions().ObjC1 && II) { 341 // @interface and @compatibility_alias introduce typedef-like names. 342 // Unlike typedef's, they can only be introduced at file-scope (and are 343 // therefore not scoped decls). They can, however, be shadowed by 344 // other names in IDNS_Ordinary. 345 ObjCInterfaceDeclsTy::iterator IDI = ObjCInterfaceDecls.find(II); 346 if (IDI != ObjCInterfaceDecls.end()) 347 return IDI->second; 348 ObjCAliasTy::iterator I = ObjCAliasDecls.find(II); 349 if (I != ObjCAliasDecls.end()) 350 return I->second->getClassInterface(); 351 } 352 } 353 return 0; 354} 355 356void Sema::InitBuiltinVaListType() { 357 if (!Context.getBuiltinVaListType().isNull()) 358 return; 359 360 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 361 Decl *VaDecl = LookupDecl(VaIdent, Decl::IDNS_Ordinary, TUScope); 362 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 363 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 364} 365 366/// LazilyCreateBuiltin - The specified Builtin-ID was first used at file scope. 367/// lazily create a decl for it. 368ScopedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 369 Scope *S) { 370 Builtin::ID BID = (Builtin::ID)bid; 371 372 if (Context.BuiltinInfo.hasVAListUse(BID)) 373 InitBuiltinVaListType(); 374 375 QualType R = Context.BuiltinInfo.GetBuiltinType(BID, Context); 376 FunctionDecl *New = FunctionDecl::Create(Context, 377 Context.getTranslationUnitDecl(), 378 SourceLocation(), II, R, 379 FunctionDecl::Extern, false, 0); 380 381 // Create Decl objects for each parameter, adding them to the 382 // FunctionDecl. 383 if (FunctionTypeProto *FT = dyn_cast<FunctionTypeProto>(R)) { 384 llvm::SmallVector<ParmVarDecl*, 16> Params; 385 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 386 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 387 FT->getArgType(i), VarDecl::None, 0, 388 0)); 389 New->setParams(&Params[0], Params.size()); 390 } 391 392 393 394 // TUScope is the translation-unit scope to insert this function into. 395 PushOnScopeChains(New, TUScope); 396 return New; 397} 398 399/// GetStdNamespace - This method gets the C++ "std" namespace. This is where 400/// everything from the standard library is defined. 401NamespaceDecl *Sema::GetStdNamespace() { 402 if (!StdNamespace) { 403 IdentifierInfo *StdIdent = &PP.getIdentifierTable().get("std"); 404 DeclContext *Global = Context.getTranslationUnitDecl(); 405 Decl *Std = LookupDecl(StdIdent, Decl::IDNS_Tag | Decl::IDNS_Ordinary, 406 0, Global, /*enableLazyBuiltinCreation=*/false); 407 StdNamespace = dyn_cast_or_null<NamespaceDecl>(Std); 408 } 409 return StdNamespace; 410} 411 412/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the same name 413/// and scope as a previous declaration 'Old'. Figure out how to resolve this 414/// situation, merging decls or emitting diagnostics as appropriate. 415/// 416TypedefDecl *Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 417 // Allow multiple definitions for ObjC built-in typedefs. 418 // FIXME: Verify the underlying types are equivalent! 419 if (getLangOptions().ObjC1) { 420 const IdentifierInfo *TypeID = New->getIdentifier(); 421 switch (TypeID->getLength()) { 422 default: break; 423 case 2: 424 if (!TypeID->isStr("id")) 425 break; 426 Context.setObjCIdType(New); 427 return New; 428 case 5: 429 if (!TypeID->isStr("Class")) 430 break; 431 Context.setObjCClassType(New); 432 return New; 433 case 3: 434 if (!TypeID->isStr("SEL")) 435 break; 436 Context.setObjCSelType(New); 437 return New; 438 case 8: 439 if (!TypeID->isStr("Protocol")) 440 break; 441 Context.setObjCProtoType(New->getUnderlyingType()); 442 return New; 443 } 444 // Fall through - the typedef name was not a builtin type. 445 } 446 // Verify the old decl was also a typedef. 447 TypedefDecl *Old = dyn_cast<TypedefDecl>(OldD); 448 if (!Old) { 449 Diag(New->getLocation(), diag::err_redefinition_different_kind) 450 << New->getDeclName(); 451 Diag(OldD->getLocation(), diag::note_previous_definition); 452 return New; 453 } 454 455 // If the typedef types are not identical, reject them in all languages and 456 // with any extensions enabled. 457 if (Old->getUnderlyingType() != New->getUnderlyingType() && 458 Context.getCanonicalType(Old->getUnderlyingType()) != 459 Context.getCanonicalType(New->getUnderlyingType())) { 460 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 461 << New->getUnderlyingType() << Old->getUnderlyingType(); 462 Diag(Old->getLocation(), diag::note_previous_definition); 463 return Old; 464 } 465 466 if (getLangOptions().Microsoft) return New; 467 468 // C++ [dcl.typedef]p2: 469 // In a given non-class scope, a typedef specifier can be used to 470 // redefine the name of any type declared in that scope to refer 471 // to the type to which it already refers. 472 if (getLangOptions().CPlusPlus && !isa<CXXRecordDecl>(CurContext)) 473 return New; 474 475 // In C, redeclaration of a type is a constraint violation (6.7.2.3p1). 476 // Apparently GCC, Intel, and Sun all silently ignore the redeclaration if 477 // *either* declaration is in a system header. The code below implements 478 // this adhoc compatibility rule. FIXME: The following code will not 479 // work properly when compiling ".i" files (containing preprocessed output). 480 if (PP.getDiagnostics().getSuppressSystemWarnings()) { 481 SourceManager &SrcMgr = Context.getSourceManager(); 482 if (SrcMgr.isInSystemHeader(Old->getLocation())) 483 return New; 484 if (SrcMgr.isInSystemHeader(New->getLocation())) 485 return New; 486 } 487 488 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 489 Diag(Old->getLocation(), diag::note_previous_definition); 490 return New; 491} 492 493/// DeclhasAttr - returns true if decl Declaration already has the target 494/// attribute. 495static bool DeclHasAttr(const Decl *decl, const Attr *target) { 496 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 497 if (attr->getKind() == target->getKind()) 498 return true; 499 500 return false; 501} 502 503/// MergeAttributes - append attributes from the Old decl to the New one. 504static void MergeAttributes(Decl *New, Decl *Old) { 505 Attr *attr = const_cast<Attr*>(Old->getAttrs()), *tmp; 506 507 while (attr) { 508 tmp = attr; 509 attr = attr->getNext(); 510 511 if (!DeclHasAttr(New, tmp)) { 512 New->addAttr(tmp); 513 } else { 514 tmp->setNext(0); 515 delete(tmp); 516 } 517 } 518 519 Old->invalidateAttrs(); 520} 521 522/// MergeFunctionDecl - We just parsed a function 'New' from 523/// declarator D which has the same name and scope as a previous 524/// declaration 'Old'. Figure out how to resolve this situation, 525/// merging decls or emitting diagnostics as appropriate. 526/// Redeclaration will be set true if this New is a redeclaration OldD. 527/// 528/// In C++, New and Old must be declarations that are not 529/// overloaded. Use IsOverload to determine whether New and Old are 530/// overloaded, and to select the Old declaration that New should be 531/// merged with. 532FunctionDecl * 533Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD, bool &Redeclaration) { 534 assert(!isa<OverloadedFunctionDecl>(OldD) && 535 "Cannot merge with an overloaded function declaration"); 536 537 Redeclaration = false; 538 // Verify the old decl was also a function. 539 FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); 540 if (!Old) { 541 Diag(New->getLocation(), diag::err_redefinition_different_kind) 542 << New->getDeclName(); 543 Diag(OldD->getLocation(), diag::note_previous_definition); 544 return New; 545 } 546 547 // Determine whether the previous declaration was a definition, 548 // implicit declaration, or a declaration. 549 diag::kind PrevDiag; 550 if (Old->isThisDeclarationADefinition()) 551 PrevDiag = diag::note_previous_definition; 552 else if (Old->isImplicit()) 553 PrevDiag = diag::note_previous_implicit_declaration; 554 else 555 PrevDiag = diag::note_previous_declaration; 556 557 QualType OldQType = Context.getCanonicalType(Old->getType()); 558 QualType NewQType = Context.getCanonicalType(New->getType()); 559 560 if (getLangOptions().CPlusPlus) { 561 // (C++98 13.1p2): 562 // Certain function declarations cannot be overloaded: 563 // -- Function declarations that differ only in the return type 564 // cannot be overloaded. 565 QualType OldReturnType 566 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 567 QualType NewReturnType 568 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 569 if (OldReturnType != NewReturnType) { 570 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 571 Diag(Old->getLocation(), PrevDiag); 572 Redeclaration = true; 573 return New; 574 } 575 576 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 577 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 578 if (OldMethod && NewMethod) { 579 // -- Member function declarations with the same name and the 580 // same parameter types cannot be overloaded if any of them 581 // is a static member function declaration. 582 if (OldMethod->isStatic() || NewMethod->isStatic()) { 583 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 584 Diag(Old->getLocation(), PrevDiag); 585 return New; 586 } 587 588 // C++ [class.mem]p1: 589 // [...] A member shall not be declared twice in the 590 // member-specification, except that a nested class or member 591 // class template can be declared and then later defined. 592 if (OldMethod->getLexicalDeclContext() == 593 NewMethod->getLexicalDeclContext()) { 594 unsigned NewDiag; 595 if (isa<CXXConstructorDecl>(OldMethod)) 596 NewDiag = diag::err_constructor_redeclared; 597 else if (isa<CXXDestructorDecl>(NewMethod)) 598 NewDiag = diag::err_destructor_redeclared; 599 else if (isa<CXXConversionDecl>(NewMethod)) 600 NewDiag = diag::err_conv_function_redeclared; 601 else 602 NewDiag = diag::err_member_redeclared; 603 604 Diag(New->getLocation(), NewDiag); 605 Diag(Old->getLocation(), PrevDiag); 606 } 607 } 608 609 // (C++98 8.3.5p3): 610 // All declarations for a function shall agree exactly in both the 611 // return type and the parameter-type-list. 612 if (OldQType == NewQType) { 613 // We have a redeclaration. 614 MergeAttributes(New, Old); 615 Redeclaration = true; 616 return MergeCXXFunctionDecl(New, Old); 617 } 618 619 // Fall through for conflicting redeclarations and redefinitions. 620 } 621 622 // C: Function types need to be compatible, not identical. This handles 623 // duplicate function decls like "void f(int); void f(enum X);" properly. 624 if (!getLangOptions().CPlusPlus && 625 Context.typesAreCompatible(OldQType, NewQType)) { 626 MergeAttributes(New, Old); 627 Redeclaration = true; 628 return New; 629 } 630 631 // A function that has already been declared has been redeclared or defined 632 // with a different type- show appropriate diagnostic 633 634 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 635 // TODO: This is totally simplistic. It should handle merging functions 636 // together etc, merging extern int X; int X; ... 637 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 638 Diag(Old->getLocation(), PrevDiag); 639 return New; 640} 641 642/// Predicate for C "tentative" external object definitions (C99 6.9.2). 643static bool isTentativeDefinition(VarDecl *VD) { 644 if (VD->isFileVarDecl()) 645 return (!VD->getInit() && 646 (VD->getStorageClass() == VarDecl::None || 647 VD->getStorageClass() == VarDecl::Static)); 648 return false; 649} 650 651/// CheckForFileScopedRedefinitions - Make sure we forgo redefinition errors 652/// when dealing with C "tentative" external object definitions (C99 6.9.2). 653void Sema::CheckForFileScopedRedefinitions(Scope *S, VarDecl *VD) { 654 bool VDIsTentative = isTentativeDefinition(VD); 655 bool VDIsIncompleteArray = VD->getType()->isIncompleteArrayType(); 656 657 // FIXME: I don't this will actually see all of the 658 // redefinitions. Can't we check this property on-the-fly? 659 for (IdentifierResolver::iterator 660 I = IdResolver.begin(VD->getIdentifier(), 661 VD->getDeclContext(), false/*LookInParentCtx*/), 662 E = IdResolver.end(); I != E; ++I) { 663 if (*I != VD && isDeclInScope(*I, VD->getDeclContext(), S)) { 664 VarDecl *OldDecl = dyn_cast<VarDecl>(*I); 665 666 // Handle the following case: 667 // int a[10]; 668 // int a[]; - the code below makes sure we set the correct type. 669 // int a[11]; - this is an error, size isn't 10. 670 if (OldDecl && VDIsTentative && VDIsIncompleteArray && 671 OldDecl->getType()->isConstantArrayType()) 672 VD->setType(OldDecl->getType()); 673 674 // Check for "tentative" definitions. We can't accomplish this in 675 // MergeVarDecl since the initializer hasn't been attached. 676 if (!OldDecl || isTentativeDefinition(OldDecl) || VDIsTentative) 677 continue; 678 679 // Handle __private_extern__ just like extern. 680 if (OldDecl->getStorageClass() != VarDecl::Extern && 681 OldDecl->getStorageClass() != VarDecl::PrivateExtern && 682 VD->getStorageClass() != VarDecl::Extern && 683 VD->getStorageClass() != VarDecl::PrivateExtern) { 684 Diag(VD->getLocation(), diag::err_redefinition) << VD->getDeclName(); 685 Diag(OldDecl->getLocation(), diag::note_previous_definition); 686 } 687 } 688 } 689} 690 691/// MergeVarDecl - We just parsed a variable 'New' which has the same name 692/// and scope as a previous declaration 'Old'. Figure out how to resolve this 693/// situation, merging decls or emitting diagnostics as appropriate. 694/// 695/// Tentative definition rules (C99 6.9.2p2) are checked by 696/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 697/// definitions here, since the initializer hasn't been attached. 698/// 699VarDecl *Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 700 // Verify the old decl was also a variable. 701 VarDecl *Old = dyn_cast<VarDecl>(OldD); 702 if (!Old) { 703 Diag(New->getLocation(), diag::err_redefinition_different_kind) 704 << New->getDeclName(); 705 Diag(OldD->getLocation(), diag::note_previous_definition); 706 return New; 707 } 708 709 MergeAttributes(New, Old); 710 711 // Verify the types match. 712 QualType OldCType = Context.getCanonicalType(Old->getType()); 713 QualType NewCType = Context.getCanonicalType(New->getType()); 714 if (OldCType != NewCType && !Context.typesAreCompatible(OldCType, NewCType)) { 715 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 716 Diag(Old->getLocation(), diag::note_previous_definition); 717 return New; 718 } 719 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 720 if (New->getStorageClass() == VarDecl::Static && 721 (Old->getStorageClass() == VarDecl::None || 722 Old->getStorageClass() == VarDecl::Extern)) { 723 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 724 Diag(Old->getLocation(), diag::note_previous_definition); 725 return New; 726 } 727 // C99 6.2.2p4: Check if we have a non-static decl followed by a static. 728 if (New->getStorageClass() != VarDecl::Static && 729 Old->getStorageClass() == VarDecl::Static) { 730 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 731 Diag(Old->getLocation(), diag::note_previous_definition); 732 return New; 733 } 734 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 735 if (New->getStorageClass() != VarDecl::Extern && !New->isFileVarDecl()) { 736 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 737 Diag(Old->getLocation(), diag::note_previous_definition); 738 } 739 return New; 740} 741 742/// CheckParmsForFunctionDef - Check that the parameters of the given 743/// function are appropriate for the definition of a function. This 744/// takes care of any checks that cannot be performed on the 745/// declaration itself, e.g., that the types of each of the function 746/// parameters are complete. 747bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 748 bool HasInvalidParm = false; 749 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 750 ParmVarDecl *Param = FD->getParamDecl(p); 751 752 // C99 6.7.5.3p4: the parameters in a parameter type list in a 753 // function declarator that is part of a function definition of 754 // that function shall not have incomplete type. 755 if (Param->getType()->isIncompleteType() && 756 !Param->isInvalidDecl()) { 757 Diag(Param->getLocation(), diag::err_typecheck_decl_incomplete_type) 758 << Param->getType(); 759 Param->setInvalidDecl(); 760 HasInvalidParm = true; 761 } 762 763 // C99 6.9.1p5: If the declarator includes a parameter type list, the 764 // declaration of each parameter shall include an identifier. 765 if (Param->getIdentifier() == 0 && !getLangOptions().CPlusPlus) 766 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 767 } 768 769 return HasInvalidParm; 770} 771 772/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 773/// no declarator (e.g. "struct foo;") is parsed. 774Sema::DeclTy *Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 775 // TODO: emit error on 'int;' or 'const enum foo;'. 776 // TODO: emit error on 'typedef int;' 777 // if (!DS.isMissingDeclaratorOk()) Diag(...); 778 779 return dyn_cast_or_null<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 780} 781 782bool Sema::CheckSingleInitializer(Expr *&Init, QualType DeclType) { 783 // Get the type before calling CheckSingleAssignmentConstraints(), since 784 // it can promote the expression. 785 QualType InitType = Init->getType(); 786 787 if (getLangOptions().CPlusPlus) 788 return PerformCopyInitialization(Init, DeclType, "initializing"); 789 790 AssignConvertType ConvTy = CheckSingleAssignmentConstraints(DeclType, Init); 791 return DiagnoseAssignmentResult(ConvTy, Init->getLocStart(), DeclType, 792 InitType, Init, "initializing"); 793} 794 795bool Sema::CheckStringLiteralInit(StringLiteral *strLiteral, QualType &DeclT) { 796 const ArrayType *AT = Context.getAsArrayType(DeclT); 797 798 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) { 799 // C99 6.7.8p14. We have an array of character type with unknown size 800 // being initialized to a string literal. 801 llvm::APSInt ConstVal(32); 802 ConstVal = strLiteral->getByteLength() + 1; 803 // Return a new array type (C99 6.7.8p22). 804 DeclT = Context.getConstantArrayType(IAT->getElementType(), ConstVal, 805 ArrayType::Normal, 0); 806 } else { 807 const ConstantArrayType *CAT = cast<ConstantArrayType>(AT); 808 // C99 6.7.8p14. We have an array of character type with known size. 809 // FIXME: Avoid truncation for 64-bit length strings. 810 if (strLiteral->getByteLength() > (unsigned)CAT->getSize().getZExtValue()) 811 Diag(strLiteral->getSourceRange().getBegin(), 812 diag::warn_initializer_string_for_char_array_too_long) 813 << strLiteral->getSourceRange(); 814 } 815 // Set type from "char *" to "constant array of char". 816 strLiteral->setType(DeclT); 817 // For now, we always return false (meaning success). 818 return false; 819} 820 821StringLiteral *Sema::IsStringLiteralInit(Expr *Init, QualType DeclType) { 822 const ArrayType *AT = Context.getAsArrayType(DeclType); 823 if (AT && AT->getElementType()->isCharType()) { 824 return dyn_cast<StringLiteral>(Init); 825 } 826 return 0; 827} 828 829bool Sema::CheckInitializerTypes(Expr *&Init, QualType &DeclType, 830 SourceLocation InitLoc, 831 DeclarationName InitEntity) { 832 if (DeclType->isDependentType() || Init->isTypeDependent()) 833 return false; 834 835 // C++ [dcl.init.ref]p1: 836 // A variable declared to be a T&, that is "reference to type T" 837 // (8.3.2), shall be initialized by an object, or function, of 838 // type T or by an object that can be converted into a T. 839 if (DeclType->isReferenceType()) 840 return CheckReferenceInit(Init, DeclType); 841 842 // C99 6.7.8p3: The type of the entity to be initialized shall be an array 843 // of unknown size ("[]") or an object type that is not a variable array type. 844 if (const VariableArrayType *VAT = Context.getAsVariableArrayType(DeclType)) 845 return Diag(InitLoc, diag::err_variable_object_no_init) 846 << VAT->getSizeExpr()->getSourceRange(); 847 848 InitListExpr *InitList = dyn_cast<InitListExpr>(Init); 849 if (!InitList) { 850 // FIXME: Handle wide strings 851 if (StringLiteral *strLiteral = IsStringLiteralInit(Init, DeclType)) 852 return CheckStringLiteralInit(strLiteral, DeclType); 853 854 // C++ [dcl.init]p14: 855 // -- If the destination type is a (possibly cv-qualified) class 856 // type: 857 if (getLangOptions().CPlusPlus && DeclType->isRecordType()) { 858 QualType DeclTypeC = Context.getCanonicalType(DeclType); 859 QualType InitTypeC = Context.getCanonicalType(Init->getType()); 860 861 // -- If the initialization is direct-initialization, or if it is 862 // copy-initialization where the cv-unqualified version of the 863 // source type is the same class as, or a derived class of, the 864 // class of the destination, constructors are considered. 865 if ((DeclTypeC.getUnqualifiedType() == InitTypeC.getUnqualifiedType()) || 866 IsDerivedFrom(InitTypeC, DeclTypeC)) { 867 CXXConstructorDecl *Constructor 868 = PerformInitializationByConstructor(DeclType, &Init, 1, 869 InitLoc, Init->getSourceRange(), 870 InitEntity, IK_Copy); 871 return Constructor == 0; 872 } 873 874 // -- Otherwise (i.e., for the remaining copy-initialization 875 // cases), user-defined conversion sequences that can 876 // convert from the source type to the destination type or 877 // (when a conversion function is used) to a derived class 878 // thereof are enumerated as described in 13.3.1.4, and the 879 // best one is chosen through overload resolution 880 // (13.3). If the conversion cannot be done or is 881 // ambiguous, the initialization is ill-formed. The 882 // function selected is called with the initializer 883 // expression as its argument; if the function is a 884 // constructor, the call initializes a temporary of the 885 // destination type. 886 // FIXME: We're pretending to do copy elision here; return to 887 // this when we have ASTs for such things. 888 if (!PerformImplicitConversion(Init, DeclType, "initializing")) 889 return false; 890 891 return Diag(InitLoc, diag::err_typecheck_convert_incompatible) 892 << DeclType << InitEntity << "initializing" 893 << Init->getSourceRange(); 894 } 895 896 // C99 6.7.8p16. 897 if (DeclType->isArrayType()) 898 return Diag(Init->getLocStart(), diag::err_array_init_list_required) 899 << Init->getSourceRange(); 900 901 return CheckSingleInitializer(Init, DeclType); 902 } else if (getLangOptions().CPlusPlus) { 903 // C++ [dcl.init]p14: 904 // [...] If the class is an aggregate (8.5.1), and the initializer 905 // is a brace-enclosed list, see 8.5.1. 906 // 907 // Note: 8.5.1 is handled below; here, we diagnose the case where 908 // we have an initializer list and a destination type that is not 909 // an aggregate. 910 // FIXME: In C++0x, this is yet another form of initialization. 911 if (const RecordType *ClassRec = DeclType->getAsRecordType()) { 912 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 913 if (!ClassDecl->isAggregate()) 914 return Diag(InitLoc, diag::err_init_non_aggr_init_list) 915 << DeclType << Init->getSourceRange(); 916 } 917 } 918 919 InitListChecker CheckInitList(this, InitList, DeclType); 920 return CheckInitList.HadError(); 921} 922 923/// GetNameForDeclarator - Determine the full declaration name for the 924/// given Declarator. 925DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 926 switch (D.getKind()) { 927 case Declarator::DK_Abstract: 928 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 929 return DeclarationName(); 930 931 case Declarator::DK_Normal: 932 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 933 return DeclarationName(D.getIdentifier()); 934 935 case Declarator::DK_Constructor: { 936 QualType Ty = Context.getTypeDeclType((TypeDecl *)D.getDeclaratorIdType()); 937 Ty = Context.getCanonicalType(Ty); 938 return Context.DeclarationNames.getCXXConstructorName(Ty); 939 } 940 941 case Declarator::DK_Destructor: { 942 QualType Ty = Context.getTypeDeclType((TypeDecl *)D.getDeclaratorIdType()); 943 Ty = Context.getCanonicalType(Ty); 944 return Context.DeclarationNames.getCXXDestructorName(Ty); 945 } 946 947 case Declarator::DK_Conversion: { 948 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 949 Ty = Context.getCanonicalType(Ty); 950 return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 951 } 952 953 case Declarator::DK_Operator: 954 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 955 return Context.DeclarationNames.getCXXOperatorName( 956 D.getOverloadedOperator()); 957 } 958 959 assert(false && "Unknown name kind"); 960 return DeclarationName(); 961} 962 963/// isNearlyMatchingMemberFunction - Determine whether the C++ member 964/// functions Declaration and Definition are "nearly" matching. This 965/// heuristic is used to improve diagnostics in the case where an 966/// out-of-line member function definition doesn't match any 967/// declaration within the class. 968static bool isNearlyMatchingMemberFunction(ASTContext &Context, 969 FunctionDecl *Declaration, 970 FunctionDecl *Definition) { 971 if (Declaration->param_size() != Definition->param_size()) 972 return false; 973 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 974 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 975 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 976 977 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 978 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 979 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 980 return false; 981 } 982 983 return true; 984} 985 986Sema::DeclTy * 987Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl, 988 bool IsFunctionDefinition) { 989 ScopedDecl *LastDeclarator = dyn_cast_or_null<ScopedDecl>((Decl *)lastDecl); 990 DeclarationName Name = GetNameForDeclarator(D); 991 992 // All of these full declarators require an identifier. If it doesn't have 993 // one, the ParsedFreeStandingDeclSpec action should be used. 994 if (!Name) { 995 if (!D.getInvalidType()) // Reject this if we think it is valid. 996 Diag(D.getDeclSpec().getSourceRange().getBegin(), 997 diag::err_declarator_need_ident) 998 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 999 return 0; 1000 } 1001 1002 // The scope passed in may not be a decl scope. Zip up the scope tree until 1003 // we find one that is. 1004 while ((S->getFlags() & Scope::DeclScope) == 0 || 1005 (S->getFlags() & Scope::TemplateParamScope) != 0) 1006 S = S->getParent(); 1007 1008 DeclContext *DC; 1009 Decl *PrevDecl; 1010 ScopedDecl *New; 1011 bool InvalidDecl = false; 1012 1013 // See if this is a redefinition of a variable in the same scope. 1014 if (!D.getCXXScopeSpec().isSet()) { 1015 DC = CurContext; 1016 PrevDecl = LookupDecl(Name, Decl::IDNS_Ordinary, S); 1017 } else { // Something like "int foo::x;" 1018 DC = static_cast<DeclContext*>(D.getCXXScopeSpec().getScopeRep()); 1019 PrevDecl = LookupDecl(Name, Decl::IDNS_Ordinary, S, DC); 1020 1021 // C++ 7.3.1.2p2: 1022 // Members (including explicit specializations of templates) of a named 1023 // namespace can also be defined outside that namespace by explicit 1024 // qualification of the name being defined, provided that the entity being 1025 // defined was already declared in the namespace and the definition appears 1026 // after the point of declaration in a namespace that encloses the 1027 // declarations namespace. 1028 // 1029 // Note that we only check the context at this point. We don't yet 1030 // have enough information to make sure that PrevDecl is actually 1031 // the declaration we want to match. For example, given: 1032 // 1033 // class X { 1034 // void f(); 1035 // void f(float); 1036 // }; 1037 // 1038 // void X::f(int) { } // ill-formed 1039 // 1040 // In this case, PrevDecl will point to the overload set 1041 // containing the two f's declared in X, but neither of them 1042 // matches. 1043 if (!CurContext->Encloses(DC)) { 1044 // The qualifying scope doesn't enclose the original declaration. 1045 // Emit diagnostic based on current scope. 1046 SourceLocation L = D.getIdentifierLoc(); 1047 SourceRange R = D.getCXXScopeSpec().getRange(); 1048 if (isa<FunctionDecl>(CurContext)) { 1049 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1050 } else { 1051 Diag(L, diag::err_invalid_declarator_scope) 1052 << Name << cast<NamedDecl>(DC)->getDeclName() << R; 1053 } 1054 InvalidDecl = true; 1055 } 1056 } 1057 1058 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1059 // Maybe we will complain about the shadowed template parameter. 1060 InvalidDecl = InvalidDecl 1061 || DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 1062 // Just pretend that we didn't see the previous declaration. 1063 PrevDecl = 0; 1064 } 1065 1066 // In C++, the previous declaration we find might be a tag type 1067 // (class or enum). In this case, the new declaration will hide the 1068 // tag type. 1069 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag) 1070 PrevDecl = 0; 1071 1072 QualType R = GetTypeForDeclarator(D, S); 1073 assert(!R.isNull() && "GetTypeForDeclarator() returned null type"); 1074 1075 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1076 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1077 if (D.getCXXScopeSpec().isSet()) { 1078 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1079 << D.getCXXScopeSpec().getRange(); 1080 InvalidDecl = true; 1081 // Pretend we didn't see the scope specifier. 1082 DC = 0; 1083 } 1084 1085 // Check that there are no default arguments (C++ only). 1086 if (getLangOptions().CPlusPlus) 1087 CheckExtraCXXDefaultArguments(D); 1088 1089 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, LastDeclarator); 1090 if (!NewTD) return 0; 1091 1092 // Handle attributes prior to checking for duplicates in MergeVarDecl 1093 ProcessDeclAttributes(NewTD, D); 1094 // Merge the decl with the existing one if appropriate. If the decl is 1095 // in an outer scope, it isn't the same thing. 1096 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1097 NewTD = MergeTypeDefDecl(NewTD, PrevDecl); 1098 if (NewTD == 0) return 0; 1099 } 1100 New = NewTD; 1101 if (S->getFnParent() == 0) { 1102 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1103 // then it shall have block scope. 1104 if (NewTD->getUnderlyingType()->isVariablyModifiedType()) { 1105 if (NewTD->getUnderlyingType()->isVariableArrayType()) 1106 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1107 else 1108 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1109 1110 InvalidDecl = true; 1111 } 1112 } 1113 } else if (R.getTypePtr()->isFunctionType()) { 1114 FunctionDecl::StorageClass SC = FunctionDecl::None; 1115 switch (D.getDeclSpec().getStorageClassSpec()) { 1116 default: assert(0 && "Unknown storage class!"); 1117 case DeclSpec::SCS_auto: 1118 case DeclSpec::SCS_register: 1119 case DeclSpec::SCS_mutable: 1120 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_func); 1121 InvalidDecl = true; 1122 break; 1123 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 1124 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 1125 case DeclSpec::SCS_static: SC = FunctionDecl::Static; break; 1126 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 1127 } 1128 1129 bool isInline = D.getDeclSpec().isInlineSpecified(); 1130 // bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1131 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 1132 1133 FunctionDecl *NewFD; 1134 if (D.getKind() == Declarator::DK_Constructor) { 1135 // This is a C++ constructor declaration. 1136 assert(DC->isCXXRecord() && 1137 "Constructors can only be declared in a member context"); 1138 1139 InvalidDecl = InvalidDecl || CheckConstructorDeclarator(D, R, SC); 1140 1141 // Create the new declaration 1142 NewFD = CXXConstructorDecl::Create(Context, 1143 cast<CXXRecordDecl>(DC), 1144 D.getIdentifierLoc(), Name, R, 1145 isExplicit, isInline, 1146 /*isImplicitlyDeclared=*/false); 1147 1148 if (InvalidDecl) 1149 NewFD->setInvalidDecl(); 1150 } else if (D.getKind() == Declarator::DK_Destructor) { 1151 // This is a C++ destructor declaration. 1152 if (DC->isCXXRecord()) { 1153 InvalidDecl = InvalidDecl || CheckDestructorDeclarator(D, R, SC); 1154 1155 NewFD = CXXDestructorDecl::Create(Context, 1156 cast<CXXRecordDecl>(DC), 1157 D.getIdentifierLoc(), Name, R, 1158 isInline, 1159 /*isImplicitlyDeclared=*/false); 1160 1161 if (InvalidDecl) 1162 NewFD->setInvalidDecl(); 1163 } else { 1164 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 1165 1166 // Create a FunctionDecl to satisfy the function definition parsing 1167 // code path. 1168 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 1169 Name, R, SC, isInline, LastDeclarator, 1170 // FIXME: Move to DeclGroup... 1171 D.getDeclSpec().getSourceRange().getBegin()); 1172 InvalidDecl = true; 1173 NewFD->setInvalidDecl(); 1174 } 1175 } else if (D.getKind() == Declarator::DK_Conversion) { 1176 if (!DC->isCXXRecord()) { 1177 Diag(D.getIdentifierLoc(), 1178 diag::err_conv_function_not_member); 1179 return 0; 1180 } else { 1181 InvalidDecl = InvalidDecl || CheckConversionDeclarator(D, R, SC); 1182 1183 NewFD = CXXConversionDecl::Create(Context, 1184 cast<CXXRecordDecl>(DC), 1185 D.getIdentifierLoc(), Name, R, 1186 isInline, isExplicit); 1187 1188 if (InvalidDecl) 1189 NewFD->setInvalidDecl(); 1190 } 1191 } else if (DC->isCXXRecord()) { 1192 // This is a C++ method declaration. 1193 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 1194 D.getIdentifierLoc(), Name, R, 1195 (SC == FunctionDecl::Static), isInline, 1196 LastDeclarator); 1197 } else { 1198 NewFD = FunctionDecl::Create(Context, DC, 1199 D.getIdentifierLoc(), 1200 Name, R, SC, isInline, LastDeclarator, 1201 // FIXME: Move to DeclGroup... 1202 D.getDeclSpec().getSourceRange().getBegin()); 1203 } 1204 1205 // Handle attributes. 1206 ProcessDeclAttributes(NewFD, D); 1207 1208 // Set the lexical context. If the declarator has a C++ 1209 // scope specifier, the lexical context will be different 1210 // from the semantic context. 1211 NewFD->setLexicalDeclContext(CurContext); 1212 1213 // Handle GNU asm-label extension (encoded as an attribute). 1214 if (Expr *E = (Expr*) D.getAsmLabel()) { 1215 // The parser guarantees this is a string. 1216 StringLiteral *SE = cast<StringLiteral>(E); 1217 NewFD->addAttr(new AsmLabelAttr(std::string(SE->getStrData(), 1218 SE->getByteLength()))); 1219 } 1220 1221 // Copy the parameter declarations from the declarator D to 1222 // the function declaration NewFD, if they are available. 1223 if (D.getNumTypeObjects() > 0) { 1224 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1225 1226 // Create Decl objects for each parameter, adding them to the 1227 // FunctionDecl. 1228 llvm::SmallVector<ParmVarDecl*, 16> Params; 1229 1230 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 1231 // function that takes no arguments, not a function that takes a 1232 // single void argument. 1233 // We let through "const void" here because Sema::GetTypeForDeclarator 1234 // already checks for that case. 1235 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1236 FTI.ArgInfo[0].Param && 1237 ((ParmVarDecl*)FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 1238 // empty arg list, don't push any params. 1239 ParmVarDecl *Param = (ParmVarDecl*)FTI.ArgInfo[0].Param; 1240 1241 // In C++, the empty parameter-type-list must be spelled "void"; a 1242 // typedef of void is not permitted. 1243 if (getLangOptions().CPlusPlus && 1244 Param->getType().getUnqualifiedType() != Context.VoidTy) { 1245 Diag(Param->getLocation(), diag::ext_param_typedef_of_void); 1246 } 1247 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 1248 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 1249 Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 1250 } 1251 1252 NewFD->setParams(&Params[0], Params.size()); 1253 } else if (R->getAsTypedefType()) { 1254 // When we're declaring a function with a typedef, as in the 1255 // following example, we'll need to synthesize (unnamed) 1256 // parameters for use in the declaration. 1257 // 1258 // @code 1259 // typedef void fn(int); 1260 // fn f; 1261 // @endcode 1262 const FunctionTypeProto *FT = R->getAsFunctionTypeProto(); 1263 if (!FT) { 1264 // This is a typedef of a function with no prototype, so we 1265 // don't need to do anything. 1266 } else if ((FT->getNumArgs() == 0) || 1267 (FT->getNumArgs() == 1 && !FT->isVariadic() && 1268 FT->getArgType(0)->isVoidType())) { 1269 // This is a zero-argument function. We don't need to do anything. 1270 } else { 1271 // Synthesize a parameter for each argument type. 1272 llvm::SmallVector<ParmVarDecl*, 16> Params; 1273 for (FunctionTypeProto::arg_type_iterator ArgType = FT->arg_type_begin(); 1274 ArgType != FT->arg_type_end(); ++ArgType) { 1275 Params.push_back(ParmVarDecl::Create(Context, DC, 1276 SourceLocation(), 0, 1277 *ArgType, VarDecl::None, 1278 0, 0)); 1279 } 1280 1281 NewFD->setParams(&Params[0], Params.size()); 1282 } 1283 } 1284 1285 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) 1286 InvalidDecl = InvalidDecl || CheckConstructor(Constructor); 1287 else if (isa<CXXDestructorDecl>(NewFD)) 1288 cast<CXXRecordDecl>(NewFD->getParent())->setUserDeclaredDestructor(true); 1289 else if (CXXConversionDecl *Conversion = dyn_cast<CXXConversionDecl>(NewFD)) 1290 ActOnConversionDeclarator(Conversion); 1291 1292 // Extra checking for C++ overloaded operators (C++ [over.oper]). 1293 if (NewFD->isOverloadedOperator() && 1294 CheckOverloadedOperatorDeclaration(NewFD)) 1295 NewFD->setInvalidDecl(); 1296 1297 // Merge the decl with the existing one if appropriate. Since C functions 1298 // are in a flat namespace, make sure we consider decls in outer scopes. 1299 if (PrevDecl && 1300 (!getLangOptions().CPlusPlus||isDeclInScope(PrevDecl, DC, S))) { 1301 bool Redeclaration = false; 1302 1303 // If C++, determine whether NewFD is an overload of PrevDecl or 1304 // a declaration that requires merging. If it's an overload, 1305 // there's no more work to do here; we'll just add the new 1306 // function to the scope. 1307 OverloadedFunctionDecl::function_iterator MatchedDecl; 1308 if (!getLangOptions().CPlusPlus || 1309 !IsOverload(NewFD, PrevDecl, MatchedDecl)) { 1310 Decl *OldDecl = PrevDecl; 1311 1312 // If PrevDecl was an overloaded function, extract the 1313 // FunctionDecl that matched. 1314 if (isa<OverloadedFunctionDecl>(PrevDecl)) 1315 OldDecl = *MatchedDecl; 1316 1317 // NewFD and PrevDecl represent declarations that need to be 1318 // merged. 1319 NewFD = MergeFunctionDecl(NewFD, OldDecl, Redeclaration); 1320 1321 if (NewFD == 0) return 0; 1322 if (Redeclaration) { 1323 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 1324 1325 // An out-of-line member function declaration must also be a 1326 // definition (C++ [dcl.meaning]p1). 1327 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 1328 !InvalidDecl) { 1329 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 1330 << D.getCXXScopeSpec().getRange(); 1331 NewFD->setInvalidDecl(); 1332 } 1333 } 1334 } 1335 1336 if (!Redeclaration && D.getCXXScopeSpec().isSet()) { 1337 // The user tried to provide an out-of-line definition for a 1338 // member function, but there was no such member function 1339 // declared (C++ [class.mfct]p2). For example: 1340 // 1341 // class X { 1342 // void f() const; 1343 // }; 1344 // 1345 // void X::f() { } // ill-formed 1346 // 1347 // Complain about this problem, and attempt to suggest close 1348 // matches (e.g., those that differ only in cv-qualifiers and 1349 // whether the parameter types are references). 1350 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 1351 << cast<CXXRecordDecl>(DC)->getDeclName() 1352 << D.getCXXScopeSpec().getRange(); 1353 InvalidDecl = true; 1354 1355 PrevDecl = LookupDecl(Name, Decl::IDNS_Ordinary, S, DC); 1356 if (!PrevDecl) { 1357 // Nothing to suggest. 1358 } else if (OverloadedFunctionDecl *Ovl 1359 = dyn_cast<OverloadedFunctionDecl>(PrevDecl)) { 1360 for (OverloadedFunctionDecl::function_iterator 1361 Func = Ovl->function_begin(), 1362 FuncEnd = Ovl->function_end(); 1363 Func != FuncEnd; ++Func) { 1364 if (isNearlyMatchingMemberFunction(Context, *Func, NewFD)) 1365 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 1366 1367 } 1368 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(PrevDecl)) { 1369 // Suggest this no matter how mismatched it is; it's the only 1370 // thing we have. 1371 unsigned diag; 1372 if (isNearlyMatchingMemberFunction(Context, Method, NewFD)) 1373 diag = diag::note_member_def_close_match; 1374 else if (Method->getBody()) 1375 diag = diag::note_previous_definition; 1376 else 1377 diag = diag::note_previous_declaration; 1378 Diag(Method->getLocation(), diag); 1379 } 1380 1381 PrevDecl = 0; 1382 } 1383 } 1384 New = NewFD; 1385 1386 if (getLangOptions().CPlusPlus) { 1387 // In C++, check default arguments now that we have merged decls. 1388 CheckCXXDefaultArguments(NewFD); 1389 1390 // An out-of-line member function declaration must also be a 1391 // definition (C++ [dcl.meaning]p1). 1392 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && !InvalidDecl) { 1393 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 1394 << D.getCXXScopeSpec().getRange(); 1395 InvalidDecl = true; 1396 } 1397 } 1398 } else { 1399 // Check that there are no default arguments (C++ only). 1400 if (getLangOptions().CPlusPlus) 1401 CheckExtraCXXDefaultArguments(D); 1402 1403 if (R.getTypePtr()->isObjCInterfaceType()) { 1404 Diag(D.getIdentifierLoc(), diag::err_statically_allocated_object) 1405 << D.getIdentifier(); 1406 InvalidDecl = true; 1407 } 1408 1409 VarDecl *NewVD; 1410 VarDecl::StorageClass SC; 1411 switch (D.getDeclSpec().getStorageClassSpec()) { 1412 default: assert(0 && "Unknown storage class!"); 1413 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1414 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1415 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1416 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1417 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1418 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1419 case DeclSpec::SCS_mutable: 1420 // mutable can only appear on non-static class members, so it's always 1421 // an error here 1422 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1423 InvalidDecl = true; 1424 SC = VarDecl::None; 1425 break; 1426 } 1427 1428 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1429 if (!II) { 1430 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1431 << Name.getAsString(); 1432 return 0; 1433 } 1434 1435 if (DC->isCXXRecord()) { 1436 // This is a static data member for a C++ class. 1437 NewVD = CXXClassVarDecl::Create(Context, cast<CXXRecordDecl>(DC), 1438 D.getIdentifierLoc(), II, 1439 R, LastDeclarator); 1440 } else { 1441 bool ThreadSpecified = D.getDeclSpec().isThreadSpecified(); 1442 if (S->getFnParent() == 0) { 1443 // C99 6.9p2: The storage-class specifiers auto and register shall not 1444 // appear in the declaration specifiers in an external declaration. 1445 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 1446 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 1447 InvalidDecl = true; 1448 } 1449 } 1450 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1451 II, R, SC, LastDeclarator, 1452 // FIXME: Move to DeclGroup... 1453 D.getDeclSpec().getSourceRange().getBegin()); 1454 NewVD->setThreadSpecified(ThreadSpecified); 1455 } 1456 // Handle attributes prior to checking for duplicates in MergeVarDecl 1457 ProcessDeclAttributes(NewVD, D); 1458 1459 // Handle GNU asm-label extension (encoded as an attribute). 1460 if (Expr *E = (Expr*) D.getAsmLabel()) { 1461 // The parser guarantees this is a string. 1462 StringLiteral *SE = cast<StringLiteral>(E); 1463 NewVD->addAttr(new AsmLabelAttr(std::string(SE->getStrData(), 1464 SE->getByteLength()))); 1465 } 1466 1467 // Emit an error if an address space was applied to decl with local storage. 1468 // This includes arrays of objects with address space qualifiers, but not 1469 // automatic variables that point to other address spaces. 1470 // ISO/IEC TR 18037 S5.1.2 1471 if (NewVD->hasLocalStorage() && (NewVD->getType().getAddressSpace() != 0)) { 1472 Diag(D.getIdentifierLoc(), diag::err_as_qualified_auto_decl); 1473 InvalidDecl = true; 1474 } 1475 // Merge the decl with the existing one if appropriate. If the decl is 1476 // in an outer scope, it isn't the same thing. 1477 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1478 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 1479 // The user tried to define a non-static data member 1480 // out-of-line (C++ [dcl.meaning]p1). 1481 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 1482 << D.getCXXScopeSpec().getRange(); 1483 NewVD->Destroy(Context); 1484 return 0; 1485 } 1486 1487 NewVD = MergeVarDecl(NewVD, PrevDecl); 1488 if (NewVD == 0) return 0; 1489 1490 if (D.getCXXScopeSpec().isSet()) { 1491 // No previous declaration in the qualifying scope. 1492 Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 1493 << Name << D.getCXXScopeSpec().getRange(); 1494 InvalidDecl = true; 1495 } 1496 } 1497 New = NewVD; 1498 } 1499 1500 // Set the lexical context. If the declarator has a C++ scope specifier, the 1501 // lexical context will be different from the semantic context. 1502 New->setLexicalDeclContext(CurContext); 1503 1504 // If this has an identifier, add it to the scope stack. 1505 if (Name) 1506 PushOnScopeChains(New, S); 1507 // If any semantic error occurred, mark the decl as invalid. 1508 if (D.getInvalidType() || InvalidDecl) 1509 New->setInvalidDecl(); 1510 1511 return New; 1512} 1513 1514void Sema::InitializerElementNotConstant(const Expr *Init) { 1515 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 1516 << Init->getSourceRange(); 1517} 1518 1519bool Sema::CheckAddressConstantExpressionLValue(const Expr* Init) { 1520 switch (Init->getStmtClass()) { 1521 default: 1522 InitializerElementNotConstant(Init); 1523 return true; 1524 case Expr::ParenExprClass: { 1525 const ParenExpr* PE = cast<ParenExpr>(Init); 1526 return CheckAddressConstantExpressionLValue(PE->getSubExpr()); 1527 } 1528 case Expr::CompoundLiteralExprClass: 1529 return cast<CompoundLiteralExpr>(Init)->isFileScope(); 1530 case Expr::DeclRefExprClass: { 1531 const Decl *D = cast<DeclRefExpr>(Init)->getDecl(); 1532 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1533 if (VD->hasGlobalStorage()) 1534 return false; 1535 InitializerElementNotConstant(Init); 1536 return true; 1537 } 1538 if (isa<FunctionDecl>(D)) 1539 return false; 1540 InitializerElementNotConstant(Init); 1541 return true; 1542 } 1543 case Expr::MemberExprClass: { 1544 const MemberExpr *M = cast<MemberExpr>(Init); 1545 if (M->isArrow()) 1546 return CheckAddressConstantExpression(M->getBase()); 1547 return CheckAddressConstantExpressionLValue(M->getBase()); 1548 } 1549 case Expr::ArraySubscriptExprClass: { 1550 // FIXME: Should we pedwarn for "x[0+0]" (where x is a pointer)? 1551 const ArraySubscriptExpr *ASE = cast<ArraySubscriptExpr>(Init); 1552 return CheckAddressConstantExpression(ASE->getBase()) || 1553 CheckArithmeticConstantExpression(ASE->getIdx()); 1554 } 1555 case Expr::StringLiteralClass: 1556 case Expr::PredefinedExprClass: 1557 return false; 1558 case Expr::UnaryOperatorClass: { 1559 const UnaryOperator *Exp = cast<UnaryOperator>(Init); 1560 1561 // C99 6.6p9 1562 if (Exp->getOpcode() == UnaryOperator::Deref) 1563 return CheckAddressConstantExpression(Exp->getSubExpr()); 1564 1565 InitializerElementNotConstant(Init); 1566 return true; 1567 } 1568 } 1569} 1570 1571bool Sema::CheckAddressConstantExpression(const Expr* Init) { 1572 switch (Init->getStmtClass()) { 1573 default: 1574 InitializerElementNotConstant(Init); 1575 return true; 1576 case Expr::ParenExprClass: 1577 return CheckAddressConstantExpression(cast<ParenExpr>(Init)->getSubExpr()); 1578 case Expr::StringLiteralClass: 1579 case Expr::ObjCStringLiteralClass: 1580 return false; 1581 case Expr::CallExprClass: 1582 case Expr::CXXOperatorCallExprClass: 1583 // __builtin___CFStringMakeConstantString is a valid constant l-value. 1584 if (cast<CallExpr>(Init)->isBuiltinCall() == 1585 Builtin::BI__builtin___CFStringMakeConstantString) 1586 return false; 1587 1588 InitializerElementNotConstant(Init); 1589 return true; 1590 1591 case Expr::UnaryOperatorClass: { 1592 const UnaryOperator *Exp = cast<UnaryOperator>(Init); 1593 1594 // C99 6.6p9 1595 if (Exp->getOpcode() == UnaryOperator::AddrOf) 1596 return CheckAddressConstantExpressionLValue(Exp->getSubExpr()); 1597 1598 if (Exp->getOpcode() == UnaryOperator::Extension) 1599 return CheckAddressConstantExpression(Exp->getSubExpr()); 1600 1601 InitializerElementNotConstant(Init); 1602 return true; 1603 } 1604 case Expr::BinaryOperatorClass: { 1605 // FIXME: Should we pedwarn for expressions like "a + 1 + 2"? 1606 const BinaryOperator *Exp = cast<BinaryOperator>(Init); 1607 1608 Expr *PExp = Exp->getLHS(); 1609 Expr *IExp = Exp->getRHS(); 1610 if (IExp->getType()->isPointerType()) 1611 std::swap(PExp, IExp); 1612 1613 // FIXME: Should we pedwarn if IExp isn't an integer constant expression? 1614 return CheckAddressConstantExpression(PExp) || 1615 CheckArithmeticConstantExpression(IExp); 1616 } 1617 case Expr::ImplicitCastExprClass: 1618 case Expr::CStyleCastExprClass: { 1619 const Expr* SubExpr = cast<CastExpr>(Init)->getSubExpr(); 1620 if (Init->getStmtClass() == Expr::ImplicitCastExprClass) { 1621 // Check for implicit promotion 1622 if (SubExpr->getType()->isFunctionType() || 1623 SubExpr->getType()->isArrayType()) 1624 return CheckAddressConstantExpressionLValue(SubExpr); 1625 } 1626 1627 // Check for pointer->pointer cast 1628 if (SubExpr->getType()->isPointerType()) 1629 return CheckAddressConstantExpression(SubExpr); 1630 1631 if (SubExpr->getType()->isIntegralType()) { 1632 // Check for the special-case of a pointer->int->pointer cast; 1633 // this isn't standard, but some code requires it. See 1634 // PR2720 for an example. 1635 if (const CastExpr* SubCast = dyn_cast<CastExpr>(SubExpr)) { 1636 if (SubCast->getSubExpr()->getType()->isPointerType()) { 1637 unsigned IntWidth = Context.getIntWidth(SubCast->getType()); 1638 unsigned PointerWidth = Context.getTypeSize(Context.VoidPtrTy); 1639 if (IntWidth >= PointerWidth) { 1640 return CheckAddressConstantExpression(SubCast->getSubExpr()); 1641 } 1642 } 1643 } 1644 } 1645 if (SubExpr->getType()->isArithmeticType()) { 1646 return CheckArithmeticConstantExpression(SubExpr); 1647 } 1648 1649 InitializerElementNotConstant(Init); 1650 return true; 1651 } 1652 case Expr::ConditionalOperatorClass: { 1653 // FIXME: Should we pedwarn here? 1654 const ConditionalOperator *Exp = cast<ConditionalOperator>(Init); 1655 if (!Exp->getCond()->getType()->isArithmeticType()) { 1656 InitializerElementNotConstant(Init); 1657 return true; 1658 } 1659 if (CheckArithmeticConstantExpression(Exp->getCond())) 1660 return true; 1661 if (Exp->getLHS() && 1662 CheckAddressConstantExpression(Exp->getLHS())) 1663 return true; 1664 return CheckAddressConstantExpression(Exp->getRHS()); 1665 } 1666 case Expr::AddrLabelExprClass: 1667 return false; 1668 } 1669} 1670 1671static const Expr* FindExpressionBaseAddress(const Expr* E); 1672 1673static const Expr* FindExpressionBaseAddressLValue(const Expr* E) { 1674 switch (E->getStmtClass()) { 1675 default: 1676 return E; 1677 case Expr::ParenExprClass: { 1678 const ParenExpr* PE = cast<ParenExpr>(E); 1679 return FindExpressionBaseAddressLValue(PE->getSubExpr()); 1680 } 1681 case Expr::MemberExprClass: { 1682 const MemberExpr *M = cast<MemberExpr>(E); 1683 if (M->isArrow()) 1684 return FindExpressionBaseAddress(M->getBase()); 1685 return FindExpressionBaseAddressLValue(M->getBase()); 1686 } 1687 case Expr::ArraySubscriptExprClass: { 1688 const ArraySubscriptExpr *ASE = cast<ArraySubscriptExpr>(E); 1689 return FindExpressionBaseAddress(ASE->getBase()); 1690 } 1691 case Expr::UnaryOperatorClass: { 1692 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1693 1694 if (Exp->getOpcode() == UnaryOperator::Deref) 1695 return FindExpressionBaseAddress(Exp->getSubExpr()); 1696 1697 return E; 1698 } 1699 } 1700} 1701 1702static const Expr* FindExpressionBaseAddress(const Expr* E) { 1703 switch (E->getStmtClass()) { 1704 default: 1705 return E; 1706 case Expr::ParenExprClass: { 1707 const ParenExpr* PE = cast<ParenExpr>(E); 1708 return FindExpressionBaseAddress(PE->getSubExpr()); 1709 } 1710 case Expr::UnaryOperatorClass: { 1711 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1712 1713 // C99 6.6p9 1714 if (Exp->getOpcode() == UnaryOperator::AddrOf) 1715 return FindExpressionBaseAddressLValue(Exp->getSubExpr()); 1716 1717 if (Exp->getOpcode() == UnaryOperator::Extension) 1718 return FindExpressionBaseAddress(Exp->getSubExpr()); 1719 1720 return E; 1721 } 1722 case Expr::BinaryOperatorClass: { 1723 const BinaryOperator *Exp = cast<BinaryOperator>(E); 1724 1725 Expr *PExp = Exp->getLHS(); 1726 Expr *IExp = Exp->getRHS(); 1727 if (IExp->getType()->isPointerType()) 1728 std::swap(PExp, IExp); 1729 1730 return FindExpressionBaseAddress(PExp); 1731 } 1732 case Expr::ImplicitCastExprClass: { 1733 const Expr* SubExpr = cast<ImplicitCastExpr>(E)->getSubExpr(); 1734 1735 // Check for implicit promotion 1736 if (SubExpr->getType()->isFunctionType() || 1737 SubExpr->getType()->isArrayType()) 1738 return FindExpressionBaseAddressLValue(SubExpr); 1739 1740 // Check for pointer->pointer cast 1741 if (SubExpr->getType()->isPointerType()) 1742 return FindExpressionBaseAddress(SubExpr); 1743 1744 // We assume that we have an arithmetic expression here; 1745 // if we don't, we'll figure it out later 1746 return 0; 1747 } 1748 case Expr::CStyleCastExprClass: { 1749 const Expr* SubExpr = cast<CastExpr>(E)->getSubExpr(); 1750 1751 // Check for pointer->pointer cast 1752 if (SubExpr->getType()->isPointerType()) 1753 return FindExpressionBaseAddress(SubExpr); 1754 1755 // We assume that we have an arithmetic expression here; 1756 // if we don't, we'll figure it out later 1757 return 0; 1758 } 1759 } 1760} 1761 1762bool Sema::CheckArithmeticConstantExpression(const Expr* Init) { 1763 switch (Init->getStmtClass()) { 1764 default: 1765 InitializerElementNotConstant(Init); 1766 return true; 1767 case Expr::ParenExprClass: { 1768 const ParenExpr* PE = cast<ParenExpr>(Init); 1769 return CheckArithmeticConstantExpression(PE->getSubExpr()); 1770 } 1771 case Expr::FloatingLiteralClass: 1772 case Expr::IntegerLiteralClass: 1773 case Expr::CharacterLiteralClass: 1774 case Expr::ImaginaryLiteralClass: 1775 case Expr::TypesCompatibleExprClass: 1776 case Expr::CXXBoolLiteralExprClass: 1777 return false; 1778 case Expr::CallExprClass: 1779 case Expr::CXXOperatorCallExprClass: { 1780 const CallExpr *CE = cast<CallExpr>(Init); 1781 1782 // Allow any constant foldable calls to builtins. 1783 if (CE->isBuiltinCall() && CE->isEvaluatable(Context)) 1784 return false; 1785 1786 InitializerElementNotConstant(Init); 1787 return true; 1788 } 1789 case Expr::DeclRefExprClass: { 1790 const Decl *D = cast<DeclRefExpr>(Init)->getDecl(); 1791 if (isa<EnumConstantDecl>(D)) 1792 return false; 1793 InitializerElementNotConstant(Init); 1794 return true; 1795 } 1796 case Expr::CompoundLiteralExprClass: 1797 // Allow "(vector type){2,4}"; normal C constraints don't allow this, 1798 // but vectors are allowed to be magic. 1799 if (Init->getType()->isVectorType()) 1800 return false; 1801 InitializerElementNotConstant(Init); 1802 return true; 1803 case Expr::UnaryOperatorClass: { 1804 const UnaryOperator *Exp = cast<UnaryOperator>(Init); 1805 1806 switch (Exp->getOpcode()) { 1807 // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. 1808 // See C99 6.6p3. 1809 default: 1810 InitializerElementNotConstant(Init); 1811 return true; 1812 case UnaryOperator::OffsetOf: 1813 if (Exp->getSubExpr()->getType()->isConstantSizeType()) 1814 return false; 1815 InitializerElementNotConstant(Init); 1816 return true; 1817 case UnaryOperator::Extension: 1818 case UnaryOperator::LNot: 1819 case UnaryOperator::Plus: 1820 case UnaryOperator::Minus: 1821 case UnaryOperator::Not: 1822 return CheckArithmeticConstantExpression(Exp->getSubExpr()); 1823 } 1824 } 1825 case Expr::SizeOfAlignOfExprClass: { 1826 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(Init); 1827 // Special check for void types, which are allowed as an extension 1828 if (Exp->getTypeOfArgument()->isVoidType()) 1829 return false; 1830 // alignof always evaluates to a constant. 1831 // FIXME: is sizeof(int[3.0]) a constant expression? 1832 if (Exp->isSizeOf() && !Exp->getTypeOfArgument()->isConstantSizeType()) { 1833 InitializerElementNotConstant(Init); 1834 return true; 1835 } 1836 return false; 1837 } 1838 case Expr::BinaryOperatorClass: { 1839 const BinaryOperator *Exp = cast<BinaryOperator>(Init); 1840 1841 if (Exp->getLHS()->getType()->isArithmeticType() && 1842 Exp->getRHS()->getType()->isArithmeticType()) { 1843 return CheckArithmeticConstantExpression(Exp->getLHS()) || 1844 CheckArithmeticConstantExpression(Exp->getRHS()); 1845 } 1846 1847 if (Exp->getLHS()->getType()->isPointerType() && 1848 Exp->getRHS()->getType()->isPointerType()) { 1849 const Expr* LHSBase = FindExpressionBaseAddress(Exp->getLHS()); 1850 const Expr* RHSBase = FindExpressionBaseAddress(Exp->getRHS()); 1851 1852 // Only allow a null (constant integer) base; we could 1853 // allow some additional cases if necessary, but this 1854 // is sufficient to cover offsetof-like constructs. 1855 if (!LHSBase && !RHSBase) { 1856 return CheckAddressConstantExpression(Exp->getLHS()) || 1857 CheckAddressConstantExpression(Exp->getRHS()); 1858 } 1859 } 1860 1861 InitializerElementNotConstant(Init); 1862 return true; 1863 } 1864 case Expr::ImplicitCastExprClass: 1865 case Expr::CStyleCastExprClass: { 1866 const Expr *SubExpr = cast<CastExpr>(Init)->getSubExpr(); 1867 if (SubExpr->getType()->isArithmeticType()) 1868 return CheckArithmeticConstantExpression(SubExpr); 1869 1870 if (SubExpr->getType()->isPointerType()) { 1871 const Expr* Base = FindExpressionBaseAddress(SubExpr); 1872 // If the pointer has a null base, this is an offsetof-like construct 1873 if (!Base) 1874 return CheckAddressConstantExpression(SubExpr); 1875 } 1876 1877 InitializerElementNotConstant(Init); 1878 return true; 1879 } 1880 case Expr::ConditionalOperatorClass: { 1881 const ConditionalOperator *Exp = cast<ConditionalOperator>(Init); 1882 1883 // If GNU extensions are disabled, we require all operands to be arithmetic 1884 // constant expressions. 1885 if (getLangOptions().NoExtensions) { 1886 return CheckArithmeticConstantExpression(Exp->getCond()) || 1887 (Exp->getLHS() && CheckArithmeticConstantExpression(Exp->getLHS())) || 1888 CheckArithmeticConstantExpression(Exp->getRHS()); 1889 } 1890 1891 // Otherwise, we have to emulate some of the behavior of fold here. 1892 // Basically GCC treats things like "4 ? 1 : somefunc()" as a constant 1893 // because it can constant fold things away. To retain compatibility with 1894 // GCC code, we see if we can fold the condition to a constant (which we 1895 // should always be able to do in theory). If so, we only require the 1896 // specified arm of the conditional to be a constant. This is a horrible 1897 // hack, but is require by real world code that uses __builtin_constant_p. 1898 Expr::EvalResult EvalResult; 1899 if (!Exp->getCond()->Evaluate(EvalResult, Context) || 1900 EvalResult.HasSideEffects) { 1901 // If Evaluate couldn't fold it, CheckArithmeticConstantExpression 1902 // won't be able to either. Use it to emit the diagnostic though. 1903 bool Res = CheckArithmeticConstantExpression(Exp->getCond()); 1904 assert(Res && "Evaluate couldn't evaluate this constant?"); 1905 return Res; 1906 } 1907 1908 // Verify that the side following the condition is also a constant. 1909 const Expr *TrueSide = Exp->getLHS(), *FalseSide = Exp->getRHS(); 1910 if (EvalResult.Val.getInt() == 0) 1911 std::swap(TrueSide, FalseSide); 1912 1913 if (TrueSide && CheckArithmeticConstantExpression(TrueSide)) 1914 return true; 1915 1916 // Okay, the evaluated side evaluates to a constant, so we accept this. 1917 // Check to see if the other side is obviously not a constant. If so, 1918 // emit a warning that this is a GNU extension. 1919 if (FalseSide && !FalseSide->isEvaluatable(Context)) 1920 Diag(Init->getExprLoc(), 1921 diag::ext_typecheck_expression_not_constant_but_accepted) 1922 << FalseSide->getSourceRange(); 1923 return false; 1924 } 1925 } 1926} 1927 1928bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 1929 Expr::EvalResult Result; 1930 1931 Init = Init->IgnoreParens(); 1932 1933 if (Init->Evaluate(Result, Context) && !Result.HasSideEffects) 1934 return false; 1935 1936 // Look through CXXDefaultArgExprs; they have no meaning in this context. 1937 if (CXXDefaultArgExpr* DAE = dyn_cast<CXXDefaultArgExpr>(Init)) 1938 return CheckForConstantInitializer(DAE->getExpr(), DclT); 1939 1940 if (CompoundLiteralExpr *e = dyn_cast<CompoundLiteralExpr>(Init)) 1941 return CheckForConstantInitializer(e->getInitializer(), DclT); 1942 1943 if (InitListExpr *Exp = dyn_cast<InitListExpr>(Init)) { 1944 unsigned numInits = Exp->getNumInits(); 1945 for (unsigned i = 0; i < numInits; i++) { 1946 // FIXME: Need to get the type of the declaration for C++, 1947 // because it could be a reference? 1948 if (CheckForConstantInitializer(Exp->getInit(i), 1949 Exp->getInit(i)->getType())) 1950 return true; 1951 } 1952 return false; 1953 } 1954 1955 // FIXME: We can probably remove some of this code below, now that 1956 // Expr::Evaluate is doing the heavy lifting for scalars. 1957 1958 if (Init->isNullPointerConstant(Context)) 1959 return false; 1960 if (Init->getType()->isArithmeticType()) { 1961 QualType InitTy = Context.getCanonicalType(Init->getType()) 1962 .getUnqualifiedType(); 1963 if (InitTy == Context.BoolTy) { 1964 // Special handling for pointers implicitly cast to bool; 1965 // (e.g. "_Bool rr = &rr;"). This is only legal at the top level. 1966 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Init)) { 1967 Expr* SubE = ICE->getSubExpr(); 1968 if (SubE->getType()->isPointerType() || 1969 SubE->getType()->isArrayType() || 1970 SubE->getType()->isFunctionType()) { 1971 return CheckAddressConstantExpression(Init); 1972 } 1973 } 1974 } else if (InitTy->isIntegralType()) { 1975 Expr* SubE = 0; 1976 if (CastExpr* CE = dyn_cast<CastExpr>(Init)) 1977 SubE = CE->getSubExpr(); 1978 // Special check for pointer cast to int; we allow as an extension 1979 // an address constant cast to an integer if the integer 1980 // is of an appropriate width (this sort of code is apparently used 1981 // in some places). 1982 // FIXME: Add pedwarn? 1983 // FIXME: Don't allow bitfields here! Need the FieldDecl for that. 1984 if (SubE && (SubE->getType()->isPointerType() || 1985 SubE->getType()->isArrayType() || 1986 SubE->getType()->isFunctionType())) { 1987 unsigned IntWidth = Context.getTypeSize(Init->getType()); 1988 unsigned PointerWidth = Context.getTypeSize(Context.VoidPtrTy); 1989 if (IntWidth >= PointerWidth) 1990 return CheckAddressConstantExpression(Init); 1991 } 1992 } 1993 1994 return CheckArithmeticConstantExpression(Init); 1995 } 1996 1997 if (Init->getType()->isPointerType()) 1998 return CheckAddressConstantExpression(Init); 1999 2000 // An array type at the top level that isn't an init-list must 2001 // be a string literal 2002 if (Init->getType()->isArrayType()) 2003 return false; 2004 2005 if (Init->getType()->isFunctionType()) 2006 return false; 2007 2008 // Allow block exprs at top level. 2009 if (Init->getType()->isBlockPointerType()) 2010 return false; 2011 2012 InitializerElementNotConstant(Init); 2013 return true; 2014} 2015 2016void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init) { 2017 Decl *RealDecl = static_cast<Decl *>(dcl); 2018 Expr *Init = static_cast<Expr *>(init.release()); 2019 assert(Init && "missing initializer"); 2020 2021 // If there is no declaration, there was an error parsing it. Just ignore 2022 // the initializer. 2023 if (RealDecl == 0) { 2024 delete Init; 2025 return; 2026 } 2027 2028 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2029 if (!VDecl) { 2030 Diag(dyn_cast<ScopedDecl>(RealDecl)->getLocation(), 2031 diag::err_illegal_initializer); 2032 RealDecl->setInvalidDecl(); 2033 return; 2034 } 2035 // Get the decls type and save a reference for later, since 2036 // CheckInitializerTypes may change it. 2037 QualType DclT = VDecl->getType(), SavT = DclT; 2038 if (VDecl->isBlockVarDecl()) { 2039 VarDecl::StorageClass SC = VDecl->getStorageClass(); 2040 if (SC == VarDecl::Extern) { // C99 6.7.8p5 2041 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2042 VDecl->setInvalidDecl(); 2043 } else if (!VDecl->isInvalidDecl()) { 2044 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2045 VDecl->getDeclName())) 2046 VDecl->setInvalidDecl(); 2047 2048 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2049 if (!getLangOptions().CPlusPlus) { 2050 if (SC == VarDecl::Static) // C99 6.7.8p4. 2051 CheckForConstantInitializer(Init, DclT); 2052 } 2053 } 2054 } else if (VDecl->isFileVarDecl()) { 2055 if (VDecl->getStorageClass() == VarDecl::Extern) 2056 Diag(VDecl->getLocation(), diag::warn_extern_init); 2057 if (!VDecl->isInvalidDecl()) 2058 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2059 VDecl->getDeclName())) 2060 VDecl->setInvalidDecl(); 2061 2062 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2063 if (!getLangOptions().CPlusPlus) { 2064 // C99 6.7.8p4. All file scoped initializers need to be constant. 2065 CheckForConstantInitializer(Init, DclT); 2066 } 2067 } 2068 // If the type changed, it means we had an incomplete type that was 2069 // completed by the initializer. For example: 2070 // int ary[] = { 1, 3, 5 }; 2071 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2072 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2073 VDecl->setType(DclT); 2074 Init->setType(DclT); 2075 } 2076 2077 // Attach the initializer to the decl. 2078 VDecl->setInit(Init); 2079 return; 2080} 2081 2082void Sema::ActOnUninitializedDecl(DeclTy *dcl) { 2083 Decl *RealDecl = static_cast<Decl *>(dcl); 2084 2085 // If there is no declaration, there was an error parsing it. Just ignore it. 2086 if (RealDecl == 0) 2087 return; 2088 2089 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2090 QualType Type = Var->getType(); 2091 // C++ [dcl.init.ref]p3: 2092 // The initializer can be omitted for a reference only in a 2093 // parameter declaration (8.3.5), in the declaration of a 2094 // function return type, in the declaration of a class member 2095 // within its class declaration (9.2), and where the extern 2096 // specifier is explicitly used. 2097 if (Type->isReferenceType() && 2098 Var->getStorageClass() != VarDecl::Extern && 2099 Var->getStorageClass() != VarDecl::PrivateExtern) { 2100 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2101 << Var->getDeclName() 2102 << SourceRange(Var->getLocation(), Var->getLocation()); 2103 Var->setInvalidDecl(); 2104 return; 2105 } 2106 2107 // C++ [dcl.init]p9: 2108 // 2109 // If no initializer is specified for an object, and the object 2110 // is of (possibly cv-qualified) non-POD class type (or array 2111 // thereof), the object shall be default-initialized; if the 2112 // object is of const-qualified type, the underlying class type 2113 // shall have a user-declared default constructor. 2114 if (getLangOptions().CPlusPlus) { 2115 QualType InitType = Type; 2116 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2117 InitType = Array->getElementType(); 2118 if (Var->getStorageClass() != VarDecl::Extern && 2119 Var->getStorageClass() != VarDecl::PrivateExtern && 2120 InitType->isRecordType()) { 2121 const CXXConstructorDecl *Constructor 2122 = PerformInitializationByConstructor(InitType, 0, 0, 2123 Var->getLocation(), 2124 SourceRange(Var->getLocation(), 2125 Var->getLocation()), 2126 Var->getDeclName(), 2127 IK_Default); 2128 if (!Constructor) 2129 Var->setInvalidDecl(); 2130 } 2131 } 2132 2133#if 0 2134 // FIXME: Temporarily disabled because we are not properly parsing 2135 // linkage specifications on declarations, e.g., 2136 // 2137 // extern "C" const CGPoint CGPointerZero; 2138 // 2139 // C++ [dcl.init]p9: 2140 // 2141 // If no initializer is specified for an object, and the 2142 // object is of (possibly cv-qualified) non-POD class type (or 2143 // array thereof), the object shall be default-initialized; if 2144 // the object is of const-qualified type, the underlying class 2145 // type shall have a user-declared default 2146 // constructor. Otherwise, if no initializer is specified for 2147 // an object, the object and its subobjects, if any, have an 2148 // indeterminate initial value; if the object or any of its 2149 // subobjects are of const-qualified type, the program is 2150 // ill-formed. 2151 // 2152 // This isn't technically an error in C, so we don't diagnose it. 2153 // 2154 // FIXME: Actually perform the POD/user-defined default 2155 // constructor check. 2156 if (getLangOptions().CPlusPlus && 2157 Context.getCanonicalType(Type).isConstQualified() && 2158 Var->getStorageClass() != VarDecl::Extern) 2159 Diag(Var->getLocation(), diag::err_const_var_requires_init) 2160 << Var->getName() 2161 << SourceRange(Var->getLocation(), Var->getLocation()); 2162#endif 2163 } 2164} 2165 2166/// The declarators are chained together backwards, reverse the list. 2167Sema::DeclTy *Sema::FinalizeDeclaratorGroup(Scope *S, DeclTy *group) { 2168 // Often we have single declarators, handle them quickly. 2169 Decl *GroupDecl = static_cast<Decl*>(group); 2170 if (GroupDecl == 0) 2171 return 0; 2172 2173 ScopedDecl *Group = dyn_cast<ScopedDecl>(GroupDecl); 2174 ScopedDecl *NewGroup = 0; 2175 if (Group->getNextDeclarator() == 0) 2176 NewGroup = Group; 2177 else { // reverse the list. 2178 while (Group) { 2179 ScopedDecl *Next = Group->getNextDeclarator(); 2180 Group->setNextDeclarator(NewGroup); 2181 NewGroup = Group; 2182 Group = Next; 2183 } 2184 } 2185 // Perform semantic analysis that depends on having fully processed both 2186 // the declarator and initializer. 2187 for (ScopedDecl *ID = NewGroup; ID; ID = ID->getNextDeclarator()) { 2188 VarDecl *IDecl = dyn_cast<VarDecl>(ID); 2189 if (!IDecl) 2190 continue; 2191 QualType T = IDecl->getType(); 2192 2193 if (T->isVariableArrayType()) { 2194 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2195 2196 // FIXME: This won't give the correct result for 2197 // int a[10][n]; 2198 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2199 if (IDecl->isFileVarDecl()) { 2200 Diag(IDecl->getLocation(), diag::err_vla_decl_in_file_scope) << 2201 SizeRange; 2202 2203 IDecl->setInvalidDecl(); 2204 } else { 2205 // C99 6.7.5.2p2: If an identifier is declared to be an object with 2206 // static storage duration, it shall not have a variable length array. 2207 if (IDecl->getStorageClass() == VarDecl::Static) { 2208 Diag(IDecl->getLocation(), diag::err_vla_decl_has_static_storage) 2209 << SizeRange; 2210 IDecl->setInvalidDecl(); 2211 } else if (IDecl->getStorageClass() == VarDecl::Extern) { 2212 Diag(IDecl->getLocation(), diag::err_vla_decl_has_extern_linkage) 2213 << SizeRange; 2214 IDecl->setInvalidDecl(); 2215 } 2216 } 2217 } else if (T->isVariablyModifiedType()) { 2218 if (IDecl->isFileVarDecl()) { 2219 Diag(IDecl->getLocation(), diag::err_vm_decl_in_file_scope); 2220 IDecl->setInvalidDecl(); 2221 } else { 2222 if (IDecl->getStorageClass() == VarDecl::Extern) { 2223 Diag(IDecl->getLocation(), diag::err_vm_decl_has_extern_linkage); 2224 IDecl->setInvalidDecl(); 2225 } 2226 } 2227 } 2228 2229 // Block scope. C99 6.7p7: If an identifier for an object is declared with 2230 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 2231 if (IDecl->isBlockVarDecl() && 2232 IDecl->getStorageClass() != VarDecl::Extern) { 2233 if (T->isIncompleteType() && !IDecl->isInvalidDecl()) { 2234 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type)<<T; 2235 IDecl->setInvalidDecl(); 2236 } 2237 } 2238 // File scope. C99 6.9.2p2: A declaration of an identifier for and 2239 // object that has file scope without an initializer, and without a 2240 // storage-class specifier or with the storage-class specifier "static", 2241 // constitutes a tentative definition. Note: A tentative definition with 2242 // external linkage is valid (C99 6.2.2p5). 2243 if (isTentativeDefinition(IDecl)) { 2244 if (T->isIncompleteArrayType()) { 2245 // C99 6.9.2 (p2, p5): Implicit initialization causes an incomplete 2246 // array to be completed. Don't issue a diagnostic. 2247 } else if (T->isIncompleteType() && !IDecl->isInvalidDecl()) { 2248 // C99 6.9.2p3: If the declaration of an identifier for an object is 2249 // a tentative definition and has internal linkage (C99 6.2.2p3), the 2250 // declared type shall not be an incomplete type. 2251 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type)<<T; 2252 IDecl->setInvalidDecl(); 2253 } 2254 } 2255 if (IDecl->isFileVarDecl()) 2256 CheckForFileScopedRedefinitions(S, IDecl); 2257 } 2258 return NewGroup; 2259} 2260 2261/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 2262/// to introduce parameters into function prototype scope. 2263Sema::DeclTy * 2264Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 2265 const DeclSpec &DS = D.getDeclSpec(); 2266 2267 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 2268 VarDecl::StorageClass StorageClass = VarDecl::None; 2269 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2270 StorageClass = VarDecl::Register; 2271 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2272 Diag(DS.getStorageClassSpecLoc(), 2273 diag::err_invalid_storage_class_in_func_decl); 2274 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2275 } 2276 if (DS.isThreadSpecified()) { 2277 Diag(DS.getThreadSpecLoc(), 2278 diag::err_invalid_storage_class_in_func_decl); 2279 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2280 } 2281 2282 // Check that there are no default arguments inside the type of this 2283 // parameter (C++ only). 2284 if (getLangOptions().CPlusPlus) 2285 CheckExtraCXXDefaultArguments(D); 2286 2287 // In this context, we *do not* check D.getInvalidType(). If the declarator 2288 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 2289 // though it will not reflect the user specified type. 2290 QualType parmDeclType = GetTypeForDeclarator(D, S); 2291 2292 assert(!parmDeclType.isNull() && "GetTypeForDeclarator() returned null type"); 2293 2294 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 2295 // Can this happen for params? We already checked that they don't conflict 2296 // among each other. Here they can only shadow globals, which is ok. 2297 IdentifierInfo *II = D.getIdentifier(); 2298 if (Decl *PrevDecl = LookupDecl(II, Decl::IDNS_Ordinary, S)) { 2299 if (PrevDecl->isTemplateParameter()) { 2300 // Maybe we will complain about the shadowed template parameter. 2301 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2302 // Just pretend that we didn't see the previous declaration. 2303 PrevDecl = 0; 2304 } else if (S->isDeclScope(PrevDecl)) { 2305 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 2306 2307 // Recover by removing the name 2308 II = 0; 2309 D.SetIdentifier(0, D.getIdentifierLoc()); 2310 } 2311 } 2312 2313 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 2314 // Doing the promotion here has a win and a loss. The win is the type for 2315 // both Decl's and DeclRefExpr's will match (a convenient invariant for the 2316 // code generator). The loss is the orginal type isn't preserved. For example: 2317 // 2318 // void func(int parmvardecl[5]) { // convert "int [5]" to "int *" 2319 // int blockvardecl[5]; 2320 // sizeof(parmvardecl); // size == 4 2321 // sizeof(blockvardecl); // size == 20 2322 // } 2323 // 2324 // For expressions, all implicit conversions are captured using the 2325 // ImplicitCastExpr AST node (we have no such mechanism for Decl's). 2326 // 2327 // FIXME: If a source translation tool needs to see the original type, then 2328 // we need to consider storing both types (in ParmVarDecl)... 2329 // 2330 if (parmDeclType->isArrayType()) { 2331 // int x[restrict 4] -> int *restrict 2332 parmDeclType = Context.getArrayDecayedType(parmDeclType); 2333 } else if (parmDeclType->isFunctionType()) 2334 parmDeclType = Context.getPointerType(parmDeclType); 2335 2336 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, 2337 D.getIdentifierLoc(), II, 2338 parmDeclType, StorageClass, 2339 0, 0); 2340 2341 if (D.getInvalidType()) 2342 New->setInvalidDecl(); 2343 2344 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 2345 if (D.getCXXScopeSpec().isSet()) { 2346 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 2347 << D.getCXXScopeSpec().getRange(); 2348 New->setInvalidDecl(); 2349 } 2350 2351 // Add the parameter declaration into this scope. 2352 S->AddDecl(New); 2353 if (II) 2354 IdResolver.AddDecl(New); 2355 2356 ProcessDeclAttributes(New, D); 2357 return New; 2358 2359} 2360 2361Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 2362 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 2363 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2364 "Not a function declarator!"); 2365 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2366 2367 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 2368 // for a K&R function. 2369 if (!FTI.hasPrototype) { 2370 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2371 if (FTI.ArgInfo[i].Param == 0) { 2372 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 2373 << FTI.ArgInfo[i].Ident; 2374 // Implicitly declare the argument as type 'int' for lack of a better 2375 // type. 2376 DeclSpec DS; 2377 const char* PrevSpec; // unused 2378 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 2379 PrevSpec); 2380 Declarator ParamD(DS, Declarator::KNRTypeListContext); 2381 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 2382 FTI.ArgInfo[i].Param = ActOnParamDeclarator(FnBodyScope, ParamD); 2383 } 2384 } 2385 } else { 2386 // FIXME: Diagnose arguments without names in C. 2387 } 2388 2389 Scope *ParentScope = FnBodyScope->getParent(); 2390 2391 return ActOnStartOfFunctionDef(FnBodyScope, 2392 ActOnDeclarator(ParentScope, D, 0, 2393 /*IsFunctionDefinition=*/true)); 2394} 2395 2396Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclTy *D) { 2397 Decl *decl = static_cast<Decl*>(D); 2398 FunctionDecl *FD = cast<FunctionDecl>(decl); 2399 2400 // See if this is a redefinition. 2401 const FunctionDecl *Definition; 2402 if (FD->getBody(Definition)) { 2403 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 2404 Diag(Definition->getLocation(), diag::note_previous_definition); 2405 } 2406 2407 PushDeclContext(FnBodyScope, FD); 2408 2409 // Check the validity of our function parameters 2410 CheckParmsForFunctionDef(FD); 2411 2412 // Introduce our parameters into the function scope 2413 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 2414 ParmVarDecl *Param = FD->getParamDecl(p); 2415 // If this has an identifier, add it to the scope stack. 2416 if (Param->getIdentifier()) 2417 PushOnScopeChains(Param, FnBodyScope); 2418 } 2419 2420 return FD; 2421} 2422 2423Sema::DeclTy *Sema::ActOnFinishFunctionBody(DeclTy *D, StmtArg BodyArg) { 2424 Decl *dcl = static_cast<Decl *>(D); 2425 Stmt *Body = static_cast<Stmt*>(BodyArg.release()); 2426 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 2427 FD->setBody(Body); 2428 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 2429 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 2430 MD->setBody((Stmt*)Body); 2431 } else 2432 return 0; 2433 PopDeclContext(); 2434 // Verify and clean out per-function state. 2435 2436 // Check goto/label use. 2437 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 2438 I = LabelMap.begin(), E = LabelMap.end(); I != E; ++I) { 2439 // Verify that we have no forward references left. If so, there was a goto 2440 // or address of a label taken, but no definition of it. Label fwd 2441 // definitions are indicated with a null substmt. 2442 if (I->second->getSubStmt() == 0) { 2443 LabelStmt *L = I->second; 2444 // Emit error. 2445 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 2446 2447 // At this point, we have gotos that use the bogus label. Stitch it into 2448 // the function body so that they aren't leaked and that the AST is well 2449 // formed. 2450 if (Body) { 2451 L->setSubStmt(new NullStmt(L->getIdentLoc())); 2452 cast<CompoundStmt>(Body)->push_back(L); 2453 } else { 2454 // The whole function wasn't parsed correctly, just delete this. 2455 delete L; 2456 } 2457 } 2458 } 2459 LabelMap.clear(); 2460 2461 return D; 2462} 2463 2464/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 2465/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 2466ScopedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 2467 IdentifierInfo &II, Scope *S) { 2468 // Extension in C99. Legal in C90, but warn about it. 2469 if (getLangOptions().C99) 2470 Diag(Loc, diag::ext_implicit_function_decl) << &II; 2471 else 2472 Diag(Loc, diag::warn_implicit_function_decl) << &II; 2473 2474 // FIXME: handle stuff like: 2475 // void foo() { extern float X(); } 2476 // void bar() { X(); } <-- implicit decl for X in another scope. 2477 2478 // Set a Declarator for the implicit definition: int foo(); 2479 const char *Dummy; 2480 DeclSpec DS; 2481 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 2482 Error = Error; // Silence warning. 2483 assert(!Error && "Error setting up implicit decl!"); 2484 Declarator D(DS, Declarator::BlockContext); 2485 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, 0, 0, 0, Loc)); 2486 D.SetIdentifier(&II, Loc); 2487 2488 // Insert this function into translation-unit scope. 2489 2490 DeclContext *PrevDC = CurContext; 2491 CurContext = Context.getTranslationUnitDecl(); 2492 2493 FunctionDecl *FD = 2494 dyn_cast<FunctionDecl>(static_cast<Decl*>(ActOnDeclarator(TUScope, D, 0))); 2495 FD->setImplicit(); 2496 2497 CurContext = PrevDC; 2498 2499 return FD; 2500} 2501 2502 2503TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 2504 ScopedDecl *LastDeclarator) { 2505 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 2506 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 2507 2508 // Scope manipulation handled by caller. 2509 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 2510 D.getIdentifierLoc(), 2511 D.getIdentifier(), 2512 T, LastDeclarator); 2513 if (D.getInvalidType()) 2514 NewTD->setInvalidDecl(); 2515 return NewTD; 2516} 2517 2518/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 2519/// former case, Name will be non-null. In the later case, Name will be null. 2520/// TagType indicates what kind of tag this is. TK indicates whether this is a 2521/// reference/declaration/definition of a tag. 2522Sema::DeclTy *Sema::ActOnTag(Scope *S, unsigned TagType, TagKind TK, 2523 SourceLocation KWLoc, const CXXScopeSpec &SS, 2524 IdentifierInfo *Name, SourceLocation NameLoc, 2525 AttributeList *Attr) { 2526 // If this is not a definition, it must have a name. 2527 assert((Name != 0 || TK == TK_Definition) && 2528 "Nameless record must be a definition!"); 2529 2530 TagDecl::TagKind Kind; 2531 switch (TagType) { 2532 default: assert(0 && "Unknown tag type!"); 2533 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 2534 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 2535 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 2536 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 2537 } 2538 2539 DeclContext *DC = CurContext; 2540 ScopedDecl *PrevDecl = 0; 2541 2542 if (Name && SS.isNotEmpty()) { 2543 // We have a nested-name tag ('struct foo::bar'). 2544 2545 // Check for invalid 'foo::'. 2546 if (SS.isInvalid()) { 2547 Name = 0; 2548 goto CreateNewDecl; 2549 } 2550 2551 DC = static_cast<DeclContext*>(SS.getScopeRep()); 2552 // Look-up name inside 'foo::'. 2553 PrevDecl = dyn_cast_or_null<TagDecl>(LookupDecl(Name, Decl::IDNS_Tag,S,DC)); 2554 2555 // A tag 'foo::bar' must already exist. 2556 if (PrevDecl == 0) { 2557 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 2558 Name = 0; 2559 goto CreateNewDecl; 2560 } 2561 } else { 2562 // If this is a named struct, check to see if there was a previous forward 2563 // declaration or definition. 2564 // Use ScopedDecl instead of TagDecl, because a NamespaceDecl may come up. 2565 PrevDecl = dyn_cast_or_null<ScopedDecl>(LookupDecl(Name, Decl::IDNS_Tag,S)); 2566 } 2567 2568 if (PrevDecl && PrevDecl->isTemplateParameter()) { 2569 // Maybe we will complain about the shadowed template parameter. 2570 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 2571 // Just pretend that we didn't see the previous declaration. 2572 PrevDecl = 0; 2573 } 2574 2575 if (PrevDecl) { 2576 assert((isa<TagDecl>(PrevDecl) || isa<NamespaceDecl>(PrevDecl)) && 2577 "unexpected Decl type"); 2578 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 2579 // If this is a use of a previous tag, or if the tag is already declared 2580 // in the same scope (so that the definition/declaration completes or 2581 // rementions the tag), reuse the decl. 2582 if (TK == TK_Reference || isDeclInScope(PrevDecl, DC, S)) { 2583 // Make sure that this wasn't declared as an enum and now used as a 2584 // struct or something similar. 2585 if (PrevTagDecl->getTagKind() != Kind) { 2586 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 2587 Diag(PrevDecl->getLocation(), diag::note_previous_use); 2588 // Recover by making this an anonymous redefinition. 2589 Name = 0; 2590 PrevDecl = 0; 2591 } else { 2592 // If this is a use, just return the declaration we found. 2593 2594 // FIXME: In the future, return a variant or some other clue 2595 // for the consumer of this Decl to know it doesn't own it. 2596 // For our current ASTs this shouldn't be a problem, but will 2597 // need to be changed with DeclGroups. 2598 if (TK == TK_Reference) 2599 return PrevDecl; 2600 2601 // Diagnose attempts to redefine a tag. 2602 if (TK == TK_Definition) { 2603 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 2604 Diag(NameLoc, diag::err_redefinition) << Name; 2605 Diag(Def->getLocation(), diag::note_previous_definition); 2606 // If this is a redefinition, recover by making this struct be 2607 // anonymous, which will make any later references get the previous 2608 // definition. 2609 Name = 0; 2610 PrevDecl = 0; 2611 } 2612 // Okay, this is definition of a previously declared or referenced 2613 // tag PrevDecl. We're going to create a new Decl for it. 2614 } 2615 } 2616 // If we get here we have (another) forward declaration or we 2617 // have a definition. Just create a new decl. 2618 } else { 2619 // If we get here, this is a definition of a new tag type in a nested 2620 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 2621 // new decl/type. We set PrevDecl to NULL so that the entities 2622 // have distinct types. 2623 PrevDecl = 0; 2624 } 2625 // If we get here, we're going to create a new Decl. If PrevDecl 2626 // is non-NULL, it's a definition of the tag declared by 2627 // PrevDecl. If it's NULL, we have a new definition. 2628 } else { 2629 // PrevDecl is a namespace. 2630 if (isDeclInScope(PrevDecl, DC, S)) { 2631 // The tag name clashes with a namespace name, issue an error and 2632 // recover by making this tag be anonymous. 2633 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 2634 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2635 Name = 0; 2636 PrevDecl = 0; 2637 } else { 2638 // The existing declaration isn't relevant to us; we're in a 2639 // new scope, so clear out the previous declaration. 2640 PrevDecl = 0; 2641 } 2642 } 2643 } 2644 2645CreateNewDecl: 2646 2647 // If there is an identifier, use the location of the identifier as the 2648 // location of the decl, otherwise use the location of the struct/union 2649 // keyword. 2650 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 2651 2652 // Otherwise, create a new declaration. If there is a previous 2653 // declaration of the same entity, the two will be linked via 2654 // PrevDecl. 2655 TagDecl *New; 2656 if (Kind == TagDecl::TK_enum) { 2657 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 2658 // enum X { A, B, C } D; D should chain to X. 2659 New = EnumDecl::Create(Context, DC, Loc, Name, 2660 cast_or_null<EnumDecl>(PrevDecl)); 2661 // If this is an undefined enum, warn. 2662 if (TK != TK_Definition) Diag(Loc, diag::ext_forward_ref_enum); 2663 } else { 2664 // struct/union/class 2665 2666 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 2667 // struct X { int A; } D; D should chain to X. 2668 if (getLangOptions().CPlusPlus) 2669 // FIXME: Look for a way to use RecordDecl for simple structs. 2670 New = CXXRecordDecl::Create(Context, Kind, DC, Loc, Name, 2671 cast_or_null<CXXRecordDecl>(PrevDecl)); 2672 else 2673 New = RecordDecl::Create(Context, Kind, DC, Loc, Name, 2674 cast_or_null<RecordDecl>(PrevDecl)); 2675 } 2676 2677 if (Kind != TagDecl::TK_enum) { 2678 // Handle #pragma pack: if the #pragma pack stack has non-default 2679 // alignment, make up a packed attribute for this decl. These 2680 // attributes are checked when the ASTContext lays out the 2681 // structure. 2682 // 2683 // It is important for implementing the correct semantics that this 2684 // happen here (in act on tag decl). The #pragma pack stack is 2685 // maintained as a result of parser callbacks which can occur at 2686 // many points during the parsing of a struct declaration (because 2687 // the #pragma tokens are effectively skipped over during the 2688 // parsing of the struct). 2689 if (unsigned Alignment = PackContext.getAlignment()) 2690 New->addAttr(new PackedAttr(Alignment * 8)); 2691 } 2692 2693 if (Attr) 2694 ProcessDeclAttributeList(New, Attr); 2695 2696 // Set the lexical context. If the tag has a C++ scope specifier, the 2697 // lexical context will be different from the semantic context. 2698 New->setLexicalDeclContext(CurContext); 2699 2700 // If this has an identifier, add it to the scope stack. 2701 if (Name) { 2702 // The scope passed in may not be a decl scope. Zip up the scope tree until 2703 // we find one that is. 2704 while ((S->getFlags() & Scope::DeclScope) == 0) 2705 S = S->getParent(); 2706 2707 // Add it to the decl chain. 2708 PushOnScopeChains(New, S); 2709 } 2710 2711 return New; 2712} 2713 2714 2715/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2716/// types into constant array types in certain situations which would otherwise 2717/// be errors (for GCC compatibility). 2718static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2719 ASTContext &Context) { 2720 // This method tries to turn a variable array into a constant 2721 // array even when the size isn't an ICE. This is necessary 2722 // for compatibility with code that depends on gcc's buggy 2723 // constant expression folding, like struct {char x[(int)(char*)2];} 2724 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2725 if (!VLATy) return QualType(); 2726 2727 Expr::EvalResult EvalResult; 2728 if (!VLATy->getSizeExpr() || 2729 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context)) 2730 return QualType(); 2731 2732 assert(EvalResult.Val.isInt() && "Size expressions must be integers!"); 2733 llvm::APSInt &Res = EvalResult.Val.getInt(); 2734 if (Res > llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) 2735 return Context.getConstantArrayType(VLATy->getElementType(), 2736 Res, ArrayType::Normal, 0); 2737 return QualType(); 2738} 2739 2740bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 2741 QualType FieldTy, const Expr *BitWidth) { 2742 // FIXME: 6.7.2.1p4 - verify the field type. 2743 2744 llvm::APSInt Value; 2745 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 2746 return true; 2747 2748 // Zero-width bitfield is ok for anonymous field. 2749 if (Value == 0 && FieldName) 2750 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 2751 2752 if (Value.isNegative()) 2753 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) << FieldName; 2754 2755 uint64_t TypeSize = Context.getTypeSize(FieldTy); 2756 // FIXME: We won't need the 0 size once we check that the field type is valid. 2757 if (TypeSize && Value.getZExtValue() > TypeSize) 2758 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 2759 << FieldName << (unsigned)TypeSize; 2760 2761 return false; 2762} 2763 2764/// ActOnField - Each field of a struct/union/class is passed into this in order 2765/// to create a FieldDecl object for it. 2766Sema::DeclTy *Sema::ActOnField(Scope *S, DeclTy *TagD, 2767 SourceLocation DeclStart, 2768 Declarator &D, ExprTy *BitfieldWidth) { 2769 IdentifierInfo *II = D.getIdentifier(); 2770 Expr *BitWidth = (Expr*)BitfieldWidth; 2771 SourceLocation Loc = DeclStart; 2772 RecordDecl *Record = (RecordDecl *)TagD; 2773 if (II) Loc = D.getIdentifierLoc(); 2774 2775 // FIXME: Unnamed fields can be handled in various different ways, for 2776 // example, unnamed unions inject all members into the struct namespace! 2777 2778 QualType T = GetTypeForDeclarator(D, S); 2779 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 2780 bool InvalidDecl = false; 2781 2782 // C99 6.7.2.1p8: A member of a structure or union may have any type other 2783 // than a variably modified type. 2784 if (T->isVariablyModifiedType()) { 2785 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context); 2786 if (!FixedTy.isNull()) { 2787 Diag(Loc, diag::warn_illegal_constant_array_size); 2788 T = FixedTy; 2789 } else { 2790 Diag(Loc, diag::err_typecheck_field_variable_size); 2791 T = Context.IntTy; 2792 InvalidDecl = true; 2793 } 2794 } 2795 2796 if (BitWidth) { 2797 if (VerifyBitField(Loc, II, T, BitWidth)) 2798 InvalidDecl = true; 2799 } else { 2800 // Not a bitfield. 2801 2802 // validate II. 2803 2804 } 2805 2806 // FIXME: Chain fielddecls together. 2807 FieldDecl *NewFD; 2808 2809 // FIXME: We don't want CurContext for C, do we? No, we'll need some 2810 // other way to determine the current RecordDecl. 2811 NewFD = FieldDecl::Create(Context, Record, 2812 Loc, II, T, BitWidth, 2813 D.getDeclSpec().getStorageClassSpec() == 2814 DeclSpec::SCS_mutable, 2815 /*PrevDecl=*/0); 2816 2817 if (getLangOptions().CPlusPlus) 2818 CheckExtraCXXDefaultArguments(D); 2819 2820 ProcessDeclAttributes(NewFD, D); 2821 2822 if (D.getInvalidType() || InvalidDecl) 2823 NewFD->setInvalidDecl(); 2824 2825 if (II && getLangOptions().CPlusPlus) 2826 PushOnScopeChains(NewFD, S); 2827 else 2828 Record->addDecl(Context, NewFD); 2829 2830 return NewFD; 2831} 2832 2833/// TranslateIvarVisibility - Translate visibility from a token ID to an 2834/// AST enum value. 2835static ObjCIvarDecl::AccessControl 2836TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 2837 switch (ivarVisibility) { 2838 default: assert(0 && "Unknown visitibility kind"); 2839 case tok::objc_private: return ObjCIvarDecl::Private; 2840 case tok::objc_public: return ObjCIvarDecl::Public; 2841 case tok::objc_protected: return ObjCIvarDecl::Protected; 2842 case tok::objc_package: return ObjCIvarDecl::Package; 2843 } 2844} 2845 2846/// ActOnIvar - Each ivar field of an objective-c class is passed into this 2847/// in order to create an IvarDecl object for it. 2848Sema::DeclTy *Sema::ActOnIvar(Scope *S, 2849 SourceLocation DeclStart, 2850 Declarator &D, ExprTy *BitfieldWidth, 2851 tok::ObjCKeywordKind Visibility) { 2852 IdentifierInfo *II = D.getIdentifier(); 2853 Expr *BitWidth = (Expr*)BitfieldWidth; 2854 SourceLocation Loc = DeclStart; 2855 if (II) Loc = D.getIdentifierLoc(); 2856 2857 // FIXME: Unnamed fields can be handled in various different ways, for 2858 // example, unnamed unions inject all members into the struct namespace! 2859 2860 QualType T = GetTypeForDeclarator(D, S); 2861 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 2862 bool InvalidDecl = false; 2863 2864 if (BitWidth) { 2865 // TODO: Validate. 2866 //printf("WARNING: BITFIELDS IGNORED!\n"); 2867 2868 // 6.7.2.1p3 2869 // 6.7.2.1p4 2870 2871 } else { 2872 // Not a bitfield. 2873 2874 // validate II. 2875 2876 } 2877 2878 // C99 6.7.2.1p8: A member of a structure or union may have any type other 2879 // than a variably modified type. 2880 if (T->isVariablyModifiedType()) { 2881 Diag(Loc, diag::err_typecheck_ivar_variable_size); 2882 InvalidDecl = true; 2883 } 2884 2885 // Get the visibility (access control) for this ivar. 2886 ObjCIvarDecl::AccessControl ac = 2887 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 2888 : ObjCIvarDecl::None; 2889 2890 // Construct the decl. 2891 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, Loc, II, T, ac, 2892 (Expr *)BitfieldWidth); 2893 2894 // Process attributes attached to the ivar. 2895 ProcessDeclAttributes(NewID, D); 2896 2897 if (D.getInvalidType() || InvalidDecl) 2898 NewID->setInvalidDecl(); 2899 2900 return NewID; 2901} 2902 2903void Sema::ActOnFields(Scope* S, 2904 SourceLocation RecLoc, DeclTy *RecDecl, 2905 DeclTy **Fields, unsigned NumFields, 2906 SourceLocation LBrac, SourceLocation RBrac, 2907 AttributeList *Attr) { 2908 Decl *EnclosingDecl = static_cast<Decl*>(RecDecl); 2909 assert(EnclosingDecl && "missing record or interface decl"); 2910 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 2911 2912 if (Record) 2913 if (RecordDecl* DefRecord = Record->getDefinition(Context)) { 2914 // Diagnose code like: 2915 // struct S { struct S {} X; }; 2916 // We discover this when we complete the outer S. Reject and ignore the 2917 // outer S. 2918 Diag(DefRecord->getLocation(), diag::err_nested_redefinition) 2919 << DefRecord->getDeclName(); 2920 Diag(RecLoc, diag::note_previous_definition); 2921 Record->setInvalidDecl(); 2922 return; 2923 } 2924 2925 // Verify that all the fields are okay. 2926 unsigned NumNamedMembers = 0; 2927 llvm::SmallVector<FieldDecl*, 32> RecFields; 2928 llvm::SmallSet<const IdentifierInfo*, 32> FieldIDs; 2929 2930 for (unsigned i = 0; i != NumFields; ++i) { 2931 2932 FieldDecl *FD = cast_or_null<FieldDecl>(static_cast<Decl*>(Fields[i])); 2933 assert(FD && "missing field decl"); 2934 2935 // Remember all fields. 2936 RecFields.push_back(FD); 2937 2938 // Get the type for the field. 2939 Type *FDTy = FD->getType().getTypePtr(); 2940 2941 // C99 6.7.2.1p2 - A field may not be a function type. 2942 if (FDTy->isFunctionType()) { 2943 Diag(FD->getLocation(), diag::err_field_declared_as_function) 2944 << FD->getDeclName(); 2945 FD->setInvalidDecl(); 2946 EnclosingDecl->setInvalidDecl(); 2947 continue; 2948 } 2949 // C99 6.7.2.1p2 - A field may not be an incomplete type except... 2950 if (FDTy->isIncompleteType()) { 2951 if (!Record) { // Incomplete ivar type is always an error. 2952 Diag(FD->getLocation(), diag::err_field_incomplete) <<FD->getDeclName(); 2953 FD->setInvalidDecl(); 2954 EnclosingDecl->setInvalidDecl(); 2955 continue; 2956 } 2957 if (i != NumFields-1 || // ... that the last member ... 2958 !Record->isStruct() || // ... of a structure ... 2959 !FDTy->isArrayType()) { //... may have incomplete array type. 2960 Diag(FD->getLocation(), diag::err_field_incomplete) <<FD->getDeclName(); 2961 FD->setInvalidDecl(); 2962 EnclosingDecl->setInvalidDecl(); 2963 continue; 2964 } 2965 if (NumNamedMembers < 1) { //... must have more than named member ... 2966 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 2967 << FD->getDeclName(); 2968 FD->setInvalidDecl(); 2969 EnclosingDecl->setInvalidDecl(); 2970 continue; 2971 } 2972 // Okay, we have a legal flexible array member at the end of the struct. 2973 if (Record) 2974 Record->setHasFlexibleArrayMember(true); 2975 } 2976 /// C99 6.7.2.1p2 - a struct ending in a flexible array member cannot be the 2977 /// field of another structure or the element of an array. 2978 if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 2979 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 2980 // If this is a member of a union, then entire union becomes "flexible". 2981 if (Record && Record->isUnion()) { 2982 Record->setHasFlexibleArrayMember(true); 2983 } else { 2984 // If this is a struct/class and this is not the last element, reject 2985 // it. Note that GCC supports variable sized arrays in the middle of 2986 // structures. 2987 if (i != NumFields-1) { 2988 Diag(FD->getLocation(), diag::err_variable_sized_type_in_struct) 2989 << FD->getDeclName(); 2990 FD->setInvalidDecl(); 2991 EnclosingDecl->setInvalidDecl(); 2992 continue; 2993 } 2994 // We support flexible arrays at the end of structs in other structs 2995 // as an extension. 2996 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 2997 << FD->getDeclName(); 2998 if (Record) 2999 Record->setHasFlexibleArrayMember(true); 3000 } 3001 } 3002 } 3003 /// A field cannot be an Objective-c object 3004 if (FDTy->isObjCInterfaceType()) { 3005 Diag(FD->getLocation(), diag::err_statically_allocated_object) 3006 << FD->getDeclName(); 3007 FD->setInvalidDecl(); 3008 EnclosingDecl->setInvalidDecl(); 3009 continue; 3010 } 3011 // Keep track of the number of named members. 3012 if (IdentifierInfo *II = FD->getIdentifier()) { 3013 // Detect duplicate member names. 3014 if (!FieldIDs.insert(II)) { 3015 Diag(FD->getLocation(), diag::err_duplicate_member) << II; 3016 // Find the previous decl. 3017 SourceLocation PrevLoc; 3018 for (unsigned i = 0; ; ++i) { 3019 assert(i != RecFields.size() && "Didn't find previous def!"); 3020 if (RecFields[i]->getIdentifier() == II) { 3021 PrevLoc = RecFields[i]->getLocation(); 3022 break; 3023 } 3024 } 3025 Diag(PrevLoc, diag::note_previous_definition); 3026 FD->setInvalidDecl(); 3027 EnclosingDecl->setInvalidDecl(); 3028 continue; 3029 } 3030 ++NumNamedMembers; 3031 } 3032 } 3033 3034 // Okay, we successfully defined 'Record'. 3035 if (Record) { 3036 Record->completeDefinition(Context); 3037 // If this is a C++ record, HandleTagDeclDefinition will be invoked in 3038 // Sema::ActOnFinishCXXClassDef. 3039 if (!isa<CXXRecordDecl>(Record)) 3040 Consumer.HandleTagDeclDefinition(Record); 3041 } else { 3042 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 3043 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 3044 ID->addInstanceVariablesToClass(ClsFields, RecFields.size(), RBrac); 3045 // Must enforce the rule that ivars in the base classes may not be 3046 // duplicates. 3047 if (ID->getSuperClass()) { 3048 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 3049 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 3050 ObjCIvarDecl* Ivar = (*IVI); 3051 IdentifierInfo *II = Ivar->getIdentifier(); 3052 ObjCIvarDecl* prevIvar = ID->getSuperClass()->FindIvarDeclaration(II); 3053 if (prevIvar) { 3054 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 3055 Diag(prevIvar->getLocation(), diag::note_previous_definition); 3056 } 3057 } 3058 } 3059 } 3060 else if (ObjCImplementationDecl *IMPDecl = 3061 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 3062 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 3063 IMPDecl->ObjCAddInstanceVariablesToClassImpl(ClsFields, RecFields.size()); 3064 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 3065 } 3066 } 3067 3068 if (Attr) 3069 ProcessDeclAttributeList(Record, Attr); 3070} 3071 3072Sema::DeclTy *Sema::ActOnEnumConstant(Scope *S, DeclTy *theEnumDecl, 3073 DeclTy *lastEnumConst, 3074 SourceLocation IdLoc, IdentifierInfo *Id, 3075 SourceLocation EqualLoc, ExprTy *val) { 3076 EnumDecl *TheEnumDecl = cast<EnumDecl>(static_cast<Decl*>(theEnumDecl)); 3077 EnumConstantDecl *LastEnumConst = 3078 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(lastEnumConst)); 3079 Expr *Val = static_cast<Expr*>(val); 3080 3081 // The scope passed in may not be a decl scope. Zip up the scope tree until 3082 // we find one that is. 3083 while ((S->getFlags() & Scope::DeclScope) == 0) 3084 S = S->getParent(); 3085 3086 // Verify that there isn't already something declared with this name in this 3087 // scope. 3088 Decl *PrevDecl = LookupDecl(Id, Decl::IDNS_Ordinary, S); 3089 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3090 // Maybe we will complain about the shadowed template parameter. 3091 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 3092 // Just pretend that we didn't see the previous declaration. 3093 PrevDecl = 0; 3094 } 3095 3096 if (PrevDecl) { 3097 // When in C++, we may get a TagDecl with the same name; in this case the 3098 // enum constant will 'hide' the tag. 3099 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 3100 "Received TagDecl when not in C++!"); 3101 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 3102 if (isa<EnumConstantDecl>(PrevDecl)) 3103 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 3104 else 3105 Diag(IdLoc, diag::err_redefinition) << Id; 3106 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3107 delete Val; 3108 return 0; 3109 } 3110 } 3111 3112 llvm::APSInt EnumVal(32); 3113 QualType EltTy; 3114 if (Val) { 3115 // Make sure to promote the operand type to int. 3116 UsualUnaryConversions(Val); 3117 3118 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 3119 SourceLocation ExpLoc; 3120 if (VerifyIntegerConstantExpression(Val, &EnumVal)) { 3121 delete Val; 3122 Val = 0; // Just forget about it. 3123 } else { 3124 EltTy = Val->getType(); 3125 } 3126 } 3127 3128 if (!Val) { 3129 if (LastEnumConst) { 3130 // Assign the last value + 1. 3131 EnumVal = LastEnumConst->getInitVal(); 3132 ++EnumVal; 3133 3134 // Check for overflow on increment. 3135 if (EnumVal < LastEnumConst->getInitVal()) 3136 Diag(IdLoc, diag::warn_enum_value_overflow); 3137 3138 EltTy = LastEnumConst->getType(); 3139 } else { 3140 // First value, set to zero. 3141 EltTy = Context.IntTy; 3142 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 3143 } 3144 } 3145 3146 EnumConstantDecl *New = 3147 EnumConstantDecl::Create(Context, TheEnumDecl, IdLoc, Id, EltTy, 3148 Val, EnumVal, 3149 LastEnumConst); 3150 3151 // Register this decl in the current scope stack. 3152 PushOnScopeChains(New, S); 3153 3154 // Add this enumerator into the enum itself. 3155 // FIXME: This means that the enumerator is stored in two 3156 // DeclContexts. This is not a long-term solution. 3157 New->setLexicalDeclContext(TheEnumDecl); 3158 TheEnumDecl->addDecl(Context, New, true); 3159 return New; 3160} 3161 3162// FIXME: For consistency with ActOnFields(), we should have the parser 3163// pass in the source location for the left/right braces. 3164void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclTy *EnumDeclX, 3165 DeclTy **Elements, unsigned NumElements) { 3166 EnumDecl *Enum = cast<EnumDecl>(static_cast<Decl*>(EnumDeclX)); 3167 3168 if (Enum) { 3169 if (EnumDecl *Def = cast_or_null<EnumDecl>(Enum->getDefinition(Context))) { 3170 // Diagnose code like: 3171 // enum e0 { 3172 // E0 = sizeof(enum e0 { E1 }) 3173 // }; 3174 Diag(Def->getLocation(), diag::err_nested_redefinition) 3175 << Enum->getDeclName(); 3176 Diag(Enum->getLocation(), diag::note_previous_definition); 3177 Enum->setInvalidDecl(); 3178 return; 3179 } 3180 } 3181 // TODO: If the result value doesn't fit in an int, it must be a long or long 3182 // long value. ISO C does not support this, but GCC does as an extension, 3183 // emit a warning. 3184 unsigned IntWidth = Context.Target.getIntWidth(); 3185 3186 // Verify that all the values are okay, compute the size of the values, and 3187 // reverse the list. 3188 unsigned NumNegativeBits = 0; 3189 unsigned NumPositiveBits = 0; 3190 3191 // Keep track of whether all elements have type int. 3192 bool AllElementsInt = true; 3193 3194 QualType EnumType = Context.getTypeDeclType(Enum); 3195 EnumConstantDecl *EltList = 0; 3196 for (unsigned i = 0; i != NumElements; ++i) { 3197 EnumConstantDecl *ECD = 3198 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3199 if (!ECD) continue; // Already issued a diagnostic. 3200 3201 // If the enum value doesn't fit in an int, emit an extension warning. 3202 const llvm::APSInt &InitVal = ECD->getInitVal(); 3203 assert(InitVal.getBitWidth() >= IntWidth && 3204 "Should have promoted value to int"); 3205 if (InitVal.getBitWidth() > IntWidth) { 3206 llvm::APSInt V(InitVal); 3207 V.trunc(IntWidth); 3208 V.extend(InitVal.getBitWidth()); 3209 if (V != InitVal) 3210 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 3211 << InitVal.toString(10); 3212 } 3213 3214 // Keep track of the size of positive and negative values. 3215 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 3216 NumPositiveBits = std::max(NumPositiveBits, 3217 (unsigned)InitVal.getActiveBits()); 3218 else 3219 NumNegativeBits = std::max(NumNegativeBits, 3220 (unsigned)InitVal.getMinSignedBits()); 3221 3222 // Keep track of whether every enum element has type int (very commmon). 3223 if (AllElementsInt) 3224 AllElementsInt = ECD->getType() == Context.IntTy; 3225 3226 ECD->setNextDeclarator(EltList); 3227 EltList = ECD; 3228 } 3229 3230 // Figure out the type that should be used for this enum. 3231 // FIXME: Support attribute(packed) on enums and -fshort-enums. 3232 QualType BestType; 3233 unsigned BestWidth; 3234 3235 if (NumNegativeBits) { 3236 // If there is a negative value, figure out the smallest integer type (of 3237 // int/long/longlong) that fits. 3238 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 3239 BestType = Context.IntTy; 3240 BestWidth = IntWidth; 3241 } else { 3242 BestWidth = Context.Target.getLongWidth(); 3243 3244 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 3245 BestType = Context.LongTy; 3246 else { 3247 BestWidth = Context.Target.getLongLongWidth(); 3248 3249 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 3250 Diag(Enum->getLocation(), diag::warn_enum_too_large); 3251 BestType = Context.LongLongTy; 3252 } 3253 } 3254 } else { 3255 // If there is no negative value, figure out which of uint, ulong, ulonglong 3256 // fits. 3257 if (NumPositiveBits <= IntWidth) { 3258 BestType = Context.UnsignedIntTy; 3259 BestWidth = IntWidth; 3260 } else if (NumPositiveBits <= 3261 (BestWidth = Context.Target.getLongWidth())) { 3262 BestType = Context.UnsignedLongTy; 3263 } else { 3264 BestWidth = Context.Target.getLongLongWidth(); 3265 assert(NumPositiveBits <= BestWidth && 3266 "How could an initializer get larger than ULL?"); 3267 BestType = Context.UnsignedLongLongTy; 3268 } 3269 } 3270 3271 // Loop over all of the enumerator constants, changing their types to match 3272 // the type of the enum if needed. 3273 for (unsigned i = 0; i != NumElements; ++i) { 3274 EnumConstantDecl *ECD = 3275 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3276 if (!ECD) continue; // Already issued a diagnostic. 3277 3278 // Standard C says the enumerators have int type, but we allow, as an 3279 // extension, the enumerators to be larger than int size. If each 3280 // enumerator value fits in an int, type it as an int, otherwise type it the 3281 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 3282 // that X has type 'int', not 'unsigned'. 3283 if (ECD->getType() == Context.IntTy) { 3284 // Make sure the init value is signed. 3285 llvm::APSInt IV = ECD->getInitVal(); 3286 IV.setIsSigned(true); 3287 ECD->setInitVal(IV); 3288 3289 if (getLangOptions().CPlusPlus) 3290 // C++ [dcl.enum]p4: Following the closing brace of an 3291 // enum-specifier, each enumerator has the type of its 3292 // enumeration. 3293 ECD->setType(EnumType); 3294 continue; // Already int type. 3295 } 3296 3297 // Determine whether the value fits into an int. 3298 llvm::APSInt InitVal = ECD->getInitVal(); 3299 bool FitsInInt; 3300 if (InitVal.isUnsigned() || !InitVal.isNegative()) 3301 FitsInInt = InitVal.getActiveBits() < IntWidth; 3302 else 3303 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 3304 3305 // If it fits into an integer type, force it. Otherwise force it to match 3306 // the enum decl type. 3307 QualType NewTy; 3308 unsigned NewWidth; 3309 bool NewSign; 3310 if (FitsInInt) { 3311 NewTy = Context.IntTy; 3312 NewWidth = IntWidth; 3313 NewSign = true; 3314 } else if (ECD->getType() == BestType) { 3315 // Already the right type! 3316 if (getLangOptions().CPlusPlus) 3317 // C++ [dcl.enum]p4: Following the closing brace of an 3318 // enum-specifier, each enumerator has the type of its 3319 // enumeration. 3320 ECD->setType(EnumType); 3321 continue; 3322 } else { 3323 NewTy = BestType; 3324 NewWidth = BestWidth; 3325 NewSign = BestType->isSignedIntegerType(); 3326 } 3327 3328 // Adjust the APSInt value. 3329 InitVal.extOrTrunc(NewWidth); 3330 InitVal.setIsSigned(NewSign); 3331 ECD->setInitVal(InitVal); 3332 3333 // Adjust the Expr initializer and type. 3334 ECD->setInitExpr(new ImplicitCastExpr(NewTy, ECD->getInitExpr(), 3335 /*isLvalue=*/false)); 3336 if (getLangOptions().CPlusPlus) 3337 // C++ [dcl.enum]p4: Following the closing brace of an 3338 // enum-specifier, each enumerator has the type of its 3339 // enumeration. 3340 ECD->setType(EnumType); 3341 else 3342 ECD->setType(NewTy); 3343 } 3344 3345 Enum->completeDefinition(Context, BestType); 3346 Consumer.HandleTagDeclDefinition(Enum); 3347} 3348 3349Sema::DeclTy *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 3350 ExprArg expr) { 3351 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr.release()); 3352 3353 return FileScopeAsmDecl::Create(Context, Loc, AsmString); 3354} 3355 3356 3357void Sema::ActOnPragmaPack(PragmaPackKind Kind, IdentifierInfo *Name, 3358 ExprTy *alignment, SourceLocation PragmaLoc, 3359 SourceLocation LParenLoc, SourceLocation RParenLoc) { 3360 Expr *Alignment = static_cast<Expr *>(alignment); 3361 3362 // If specified then alignment must be a "small" power of two. 3363 unsigned AlignmentVal = 0; 3364 if (Alignment) { 3365 llvm::APSInt Val; 3366 if (!Alignment->isIntegerConstantExpr(Val, Context) || 3367 !Val.isPowerOf2() || 3368 Val.getZExtValue() > 16) { 3369 Diag(PragmaLoc, diag::warn_pragma_pack_invalid_alignment); 3370 delete Alignment; 3371 return; // Ignore 3372 } 3373 3374 AlignmentVal = (unsigned) Val.getZExtValue(); 3375 } 3376 3377 switch (Kind) { 3378 case Action::PPK_Default: // pack([n]) 3379 PackContext.setAlignment(AlignmentVal); 3380 break; 3381 3382 case Action::PPK_Show: // pack(show) 3383 // Show the current alignment, making sure to show the right value 3384 // for the default. 3385 AlignmentVal = PackContext.getAlignment(); 3386 // FIXME: This should come from the target. 3387 if (AlignmentVal == 0) 3388 AlignmentVal = 8; 3389 Diag(PragmaLoc, diag::warn_pragma_pack_show) << AlignmentVal; 3390 break; 3391 3392 case Action::PPK_Push: // pack(push [, id] [, [n]) 3393 PackContext.push(Name); 3394 // Set the new alignment if specified. 3395 if (Alignment) 3396 PackContext.setAlignment(AlignmentVal); 3397 break; 3398 3399 case Action::PPK_Pop: // pack(pop [, id] [, n]) 3400 // MSDN, C/C++ Preprocessor Reference > Pragma Directives > pack: 3401 // "#pragma pack(pop, identifier, n) is undefined" 3402 if (Alignment && Name) 3403 Diag(PragmaLoc, diag::warn_pragma_pack_pop_identifer_and_alignment); 3404 3405 // Do the pop. 3406 if (!PackContext.pop(Name)) { 3407 // If a name was specified then failure indicates the name 3408 // wasn't found. Otherwise failure indicates the stack was 3409 // empty. 3410 Diag(PragmaLoc, diag::warn_pragma_pack_pop_failed) 3411 << (Name ? "no record matching name" : "stack empty"); 3412 3413 // FIXME: Warn about popping named records as MSVC does. 3414 } else { 3415 // Pop succeeded, set the new alignment if specified. 3416 if (Alignment) 3417 PackContext.setAlignment(AlignmentVal); 3418 } 3419 break; 3420 3421 default: 3422 assert(0 && "Invalid #pragma pack kind."); 3423 } 3424} 3425 3426bool PragmaPackStack::pop(IdentifierInfo *Name) { 3427 if (Stack.empty()) 3428 return false; 3429 3430 // If name is empty just pop top. 3431 if (!Name) { 3432 Alignment = Stack.back().first; 3433 Stack.pop_back(); 3434 return true; 3435 } 3436 3437 // Otherwise, find the named record. 3438 for (unsigned i = Stack.size(); i != 0; ) { 3439 --i; 3440 if (Stack[i].second == Name) { 3441 // Found it, pop up to and including this record. 3442 Alignment = Stack[i].first; 3443 Stack.erase(Stack.begin() + i, Stack.end()); 3444 return true; 3445 } 3446 } 3447 3448 return false; 3449} 3450