SemaDecl.cpp revision 45920e82bd87454545642ee2612e656a4140889d
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 30using namespace clang; 31 32Sema::TypeTy *Sema::isTypeName(IdentifierInfo &II, Scope *S, 33 const CXXScopeSpec *SS) { 34 DeclContext *DC = 0; 35 if (SS) { 36 if (SS->isInvalid()) 37 return 0; 38 DC = static_cast<DeclContext*>(SS->getScopeRep()); 39 } 40 Decl *IIDecl = LookupDecl(&II, Decl::IDNS_Ordinary, S, DC, false); 41 42 if (IIDecl && (isa<TypedefDecl>(IIDecl) || 43 isa<ObjCInterfaceDecl>(IIDecl) || 44 isa<TagDecl>(IIDecl) || 45 isa<TemplateTypeParmDecl>(IIDecl))) 46 return IIDecl; 47 return 0; 48} 49 50DeclContext *Sema::getContainingDC(DeclContext *DC) { 51 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) { 52 // A C++ out-of-line method will return to the file declaration context. 53 if (MD->isOutOfLineDefinition()) 54 return MD->getLexicalDeclContext(); 55 56 // A C++ inline method is parsed *after* the topmost class it was declared in 57 // is fully parsed (it's "complete"). 58 // The parsing of a C++ inline method happens at the declaration context of 59 // the topmost (non-nested) class it is lexically declared in. 60 assert(isa<CXXRecordDecl>(MD->getParent()) && "C++ method not in Record."); 61 DC = MD->getParent(); 62 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 63 DC = RD; 64 65 // Return the declaration context of the topmost class the inline method is 66 // declared in. 67 return DC; 68 } 69 70 if (isa<ObjCMethodDecl>(DC)) 71 return Context.getTranslationUnitDecl(); 72 73 if (ScopedDecl *SD = dyn_cast<ScopedDecl>(DC)) 74 return SD->getLexicalDeclContext(); 75 76 return DC->getLexicalParent(); 77} 78 79void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 80 assert(getContainingDC(DC) == CurContext && 81 "The next DeclContext should be lexically contained in the current one."); 82 CurContext = DC; 83 S->setEntity(DC); 84} 85 86void Sema::PopDeclContext() { 87 assert(CurContext && "DeclContext imbalance!"); 88 89 CurContext = getContainingDC(CurContext); 90} 91 92/// Add this decl to the scope shadowed decl chains. 93void Sema::PushOnScopeChains(NamedDecl *D, Scope *S) { 94 S->AddDecl(D); 95 96 // C++ [basic.scope]p4: 97 // -- exactly one declaration shall declare a class name or 98 // enumeration name that is not a typedef name and the other 99 // declarations shall all refer to the same object or 100 // enumerator, or all refer to functions and function templates; 101 // in this case the class name or enumeration name is hidden. 102 if (TagDecl *TD = dyn_cast<TagDecl>(D)) { 103 // We are pushing the name of a tag (enum or class). 104 if (CurContext == TD->getDeclContext()) { 105 // We're pushing the tag into the current context, which might 106 // require some reshuffling in the identifier resolver. 107 IdentifierResolver::iterator 108 I = IdResolver.begin(TD->getIdentifier(), CurContext, 109 false/*LookInParentCtx*/); 110 if (I != IdResolver.end()) { 111 // There is already a declaration with the same name in the same 112 // scope. It must be found before we find the new declaration, 113 // so swap the order on the shadowed declaration chain. 114 IdResolver.AddShadowedDecl(TD, *I); 115 116 // Add this declaration to the current context. 117 CurContext->addDecl(Context, TD); 118 119 return; 120 } 121 } 122 } else if (getLangOptions().CPlusPlus && isa<FunctionDecl>(D)) { 123 // We are pushing the name of a function, which might be an 124 // overloaded name. 125 FunctionDecl *FD = cast<FunctionDecl>(D); 126 Decl *Prev = LookupDecl(FD->getDeclName(), Decl::IDNS_Ordinary, S, 127 FD->getDeclContext(), false, false); 128 if (Prev && (isa<OverloadedFunctionDecl>(Prev) || isa<FunctionDecl>(Prev))) { 129 // There is already a declaration with the same name in 130 // the same scope. It must be a function or an overloaded 131 // function. 132 OverloadedFunctionDecl* Ovl = dyn_cast<OverloadedFunctionDecl>(Prev); 133 if (!Ovl) { 134 // We haven't yet overloaded this function. Take the existing 135 // FunctionDecl and put it into an OverloadedFunctionDecl. 136 Ovl = OverloadedFunctionDecl::Create(Context, 137 FD->getDeclContext(), 138 FD->getDeclName()); 139 Ovl->addOverload(cast<FunctionDecl>(Prev)); 140 141 // If there is a name binding for the existing FunctionDecl, 142 // remove it. 143 for (IdentifierResolver::iterator I 144 = IdResolver.begin(FD->getDeclName(), FD->getDeclContext(), 145 false/*LookInParentCtx*/), 146 E = IdResolver.end(); I != E; ++I) { 147 if (*I == Prev) { 148 IdResolver.RemoveDecl(*I); 149 S->RemoveDecl(*I); 150 break; 151 } 152 } 153 154 // Add the name binding for the OverloadedFunctionDecl. 155 IdResolver.AddDecl(Ovl); 156 157 // Update the context with the newly-created overloaded 158 // function set. 159 FD->getDeclContext()->insert(Context, Ovl); 160 161 S->AddDecl(Ovl); 162 } 163 164 // We added this function declaration to the scope earlier, but 165 // we don't want it there because it is part of the overloaded 166 // function declaration. 167 S->RemoveDecl(FD); 168 169 // We have an OverloadedFunctionDecl. Add the new FunctionDecl 170 // to its list of overloads. 171 Ovl->addOverload(FD); 172 173 // Add this new function declaration to the declaration context. 174 CurContext->addDecl(Context, FD, false); 175 176 return; 177 } 178 } 179 180 // Add scoped declarations into their context, so that they can be 181 // found later. Declarations without a context won't be inserted 182 // into any context. 183 if (ScopedDecl *SD = dyn_cast<ScopedDecl>(D)) 184 CurContext->addDecl(Context, SD); 185 186 IdResolver.AddDecl(D); 187} 188 189void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 190 if (S->decl_empty()) return; 191 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 192 "Scope shouldn't contain decls!"); 193 194 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 195 I != E; ++I) { 196 Decl *TmpD = static_cast<Decl*>(*I); 197 assert(TmpD && "This decl didn't get pushed??"); 198 199 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 200 NamedDecl *D = cast<NamedDecl>(TmpD); 201 202 if (!D->getDeclName()) continue; 203 204 // Remove this name from our lexical scope. 205 IdResolver.RemoveDecl(D); 206 } 207} 208 209/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 210/// return 0 if one not found. 211ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 212 // The third "scope" argument is 0 since we aren't enabling lazy built-in 213 // creation from this context. 214 Decl *IDecl = LookupDecl(Id, Decl::IDNS_Ordinary, 0, false); 215 216 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 217} 218 219/// LookupDecl - Look up the inner-most declaration in the specified 220/// namespace. 221Decl *Sema::LookupDecl(DeclarationName Name, unsigned NSI, Scope *S, 222 const DeclContext *LookupCtx, 223 bool enableLazyBuiltinCreation, 224 bool LookInParent) { 225 if (!Name) return 0; 226 unsigned NS = NSI; 227 if (getLangOptions().CPlusPlus && (NS & Decl::IDNS_Ordinary)) 228 NS |= Decl::IDNS_Tag; 229 230 if (LookupCtx == 0 && 231 (!getLangOptions().CPlusPlus || (NS == Decl::IDNS_Label))) { 232 // Unqualified name lookup in C/Objective-C and name lookup for 233 // labels in C++ is purely lexical, so search in the 234 // declarations attached to the name. 235 assert(!LookupCtx && "Can't perform qualified name lookup here"); 236 IdentifierResolver::iterator I 237 = IdResolver.begin(Name, CurContext, LookInParent); 238 239 // Scan up the scope chain looking for a decl that matches this 240 // identifier that is in the appropriate namespace. This search 241 // should not take long, as shadowing of names is uncommon, and 242 // deep shadowing is extremely uncommon. 243 for (; I != IdResolver.end(); ++I) 244 if ((*I)->getIdentifierNamespace() & NS) 245 return *I; 246 } else if (LookupCtx) { 247 assert(getLangOptions().CPlusPlus && "No qualified name lookup in C"); 248 249 // Perform qualified name lookup into the LookupCtx. 250 // FIXME: Will need to look into base classes and such. 251 DeclContext::lookup_const_iterator I, E; 252 for (llvm::tie(I, E) = LookupCtx->lookup(Context, Name); I != E; ++I) 253 if ((*I)->getIdentifierNamespace() & NS) 254 return *I; 255 } else { 256 // Name lookup for ordinary names and tag names in C++ requires 257 // looking into scopes that aren't strictly lexical, and 258 // therefore we walk through the context as well as walking 259 // through the scopes. 260 IdentifierResolver::iterator 261 I = IdResolver.begin(Name, CurContext, true/*LookInParentCtx*/), 262 IEnd = IdResolver.end(); 263 for (; S; S = S->getParent()) { 264 // Check whether the IdResolver has anything in this scope. 265 // FIXME: The isDeclScope check could be expensive. Can we do better? 266 for (; I != IEnd && S->isDeclScope(*I); ++I) 267 if ((*I)->getIdentifierNamespace() & NS) 268 return *I; 269 270 // If there is an entity associated with this scope, it's a 271 // DeclContext. We might need to perform qualified lookup into 272 // it. 273 DeclContext *Ctx = static_cast<DeclContext *>(S->getEntity()); 274 while (Ctx && Ctx->isFunctionOrMethod()) 275 Ctx = Ctx->getParent(); 276 while (Ctx && (Ctx->isNamespace() || Ctx->isCXXRecord())) { 277 // Look for declarations of this name in this scope. 278 DeclContext::lookup_const_iterator I, E; 279 for (llvm::tie(I, E) = Ctx->lookup(Context, Name); I != E; ++I) { 280 // FIXME: Cache this result in the IdResolver 281 if ((*I)->getIdentifierNamespace() & NS) 282 return *I; 283 } 284 285 Ctx = Ctx->getParent(); 286 } 287 288 if (!LookInParent) 289 return 0; 290 } 291 } 292 293 // If we didn't find a use of this identifier, and if the identifier 294 // corresponds to a compiler builtin, create the decl object for the builtin 295 // now, injecting it into translation unit scope, and return it. 296 if (NS & Decl::IDNS_Ordinary) { 297 IdentifierInfo *II = Name.getAsIdentifierInfo(); 298 if (enableLazyBuiltinCreation && II && 299 (LookupCtx == 0 || isa<TranslationUnitDecl>(LookupCtx))) { 300 // If this is a builtin on this (or all) targets, create the decl. 301 if (unsigned BuiltinID = II->getBuiltinID()) 302 return LazilyCreateBuiltin((IdentifierInfo *)II, BuiltinID, S); 303 } 304 if (getLangOptions().ObjC1 && II) { 305 // @interface and @compatibility_alias introduce typedef-like names. 306 // Unlike typedef's, they can only be introduced at file-scope (and are 307 // therefore not scoped decls). They can, however, be shadowed by 308 // other names in IDNS_Ordinary. 309 ObjCInterfaceDeclsTy::iterator IDI = ObjCInterfaceDecls.find(II); 310 if (IDI != ObjCInterfaceDecls.end()) 311 return IDI->second; 312 ObjCAliasTy::iterator I = ObjCAliasDecls.find(II); 313 if (I != ObjCAliasDecls.end()) 314 return I->second->getClassInterface(); 315 } 316 } 317 return 0; 318} 319 320void Sema::InitBuiltinVaListType() { 321 if (!Context.getBuiltinVaListType().isNull()) 322 return; 323 324 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 325 Decl *VaDecl = LookupDecl(VaIdent, Decl::IDNS_Ordinary, TUScope); 326 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 327 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 328} 329 330/// LazilyCreateBuiltin - The specified Builtin-ID was first used at file scope. 331/// lazily create a decl for it. 332ScopedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 333 Scope *S) { 334 Builtin::ID BID = (Builtin::ID)bid; 335 336 if (Context.BuiltinInfo.hasVAListUse(BID)) 337 InitBuiltinVaListType(); 338 339 QualType R = Context.BuiltinInfo.GetBuiltinType(BID, Context); 340 FunctionDecl *New = FunctionDecl::Create(Context, 341 Context.getTranslationUnitDecl(), 342 SourceLocation(), II, R, 343 FunctionDecl::Extern, false, 0); 344 345 // Create Decl objects for each parameter, adding them to the 346 // FunctionDecl. 347 if (FunctionTypeProto *FT = dyn_cast<FunctionTypeProto>(R)) { 348 llvm::SmallVector<ParmVarDecl*, 16> Params; 349 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 350 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 351 FT->getArgType(i), VarDecl::None, 0, 352 0)); 353 New->setParams(&Params[0], Params.size()); 354 } 355 356 357 358 // TUScope is the translation-unit scope to insert this function into. 359 PushOnScopeChains(New, TUScope); 360 return New; 361} 362 363/// GetStdNamespace - This method gets the C++ "std" namespace. This is where 364/// everything from the standard library is defined. 365NamespaceDecl *Sema::GetStdNamespace() { 366 if (!StdNamespace) { 367 IdentifierInfo *StdIdent = &PP.getIdentifierTable().get("std"); 368 DeclContext *Global = Context.getTranslationUnitDecl(); 369 Decl *Std = LookupDecl(StdIdent, Decl::IDNS_Tag | Decl::IDNS_Ordinary, 370 0, Global, /*enableLazyBuiltinCreation=*/false); 371 StdNamespace = dyn_cast_or_null<NamespaceDecl>(Std); 372 } 373 return StdNamespace; 374} 375 376/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the same name 377/// and scope as a previous declaration 'Old'. Figure out how to resolve this 378/// situation, merging decls or emitting diagnostics as appropriate. 379/// 380TypedefDecl *Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 381 // Allow multiple definitions for ObjC built-in typedefs. 382 // FIXME: Verify the underlying types are equivalent! 383 if (getLangOptions().ObjC1) { 384 const IdentifierInfo *TypeID = New->getIdentifier(); 385 switch (TypeID->getLength()) { 386 default: break; 387 case 2: 388 if (!TypeID->isStr("id")) 389 break; 390 Context.setObjCIdType(New); 391 return New; 392 case 5: 393 if (!TypeID->isStr("Class")) 394 break; 395 Context.setObjCClassType(New); 396 return New; 397 case 3: 398 if (!TypeID->isStr("SEL")) 399 break; 400 Context.setObjCSelType(New); 401 return New; 402 case 8: 403 if (!TypeID->isStr("Protocol")) 404 break; 405 Context.setObjCProtoType(New->getUnderlyingType()); 406 return New; 407 } 408 // Fall through - the typedef name was not a builtin type. 409 } 410 // Verify the old decl was also a typedef. 411 TypedefDecl *Old = dyn_cast<TypedefDecl>(OldD); 412 if (!Old) { 413 Diag(New->getLocation(), diag::err_redefinition_different_kind) 414 << New->getDeclName(); 415 Diag(OldD->getLocation(), diag::note_previous_definition); 416 return New; 417 } 418 419 // If the typedef types are not identical, reject them in all languages and 420 // with any extensions enabled. 421 if (Old->getUnderlyingType() != New->getUnderlyingType() && 422 Context.getCanonicalType(Old->getUnderlyingType()) != 423 Context.getCanonicalType(New->getUnderlyingType())) { 424 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 425 << New->getUnderlyingType() << Old->getUnderlyingType(); 426 Diag(Old->getLocation(), diag::note_previous_definition); 427 return Old; 428 } 429 430 if (getLangOptions().Microsoft) return New; 431 432 // C++ [dcl.typedef]p2: 433 // In a given non-class scope, a typedef specifier can be used to 434 // redefine the name of any type declared in that scope to refer 435 // to the type to which it already refers. 436 if (getLangOptions().CPlusPlus && !isa<CXXRecordDecl>(CurContext)) 437 return New; 438 439 // In C, redeclaration of a type is a constraint violation (6.7.2.3p1). 440 // Apparently GCC, Intel, and Sun all silently ignore the redeclaration if 441 // *either* declaration is in a system header. The code below implements 442 // this adhoc compatibility rule. FIXME: The following code will not 443 // work properly when compiling ".i" files (containing preprocessed output). 444 if (PP.getDiagnostics().getSuppressSystemWarnings()) { 445 SourceManager &SrcMgr = Context.getSourceManager(); 446 if (SrcMgr.isInSystemHeader(Old->getLocation())) 447 return New; 448 if (SrcMgr.isInSystemHeader(New->getLocation())) 449 return New; 450 } 451 452 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 453 Diag(Old->getLocation(), diag::note_previous_definition); 454 return New; 455} 456 457/// DeclhasAttr - returns true if decl Declaration already has the target 458/// attribute. 459static bool DeclHasAttr(const Decl *decl, const Attr *target) { 460 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 461 if (attr->getKind() == target->getKind()) 462 return true; 463 464 return false; 465} 466 467/// MergeAttributes - append attributes from the Old decl to the New one. 468static void MergeAttributes(Decl *New, Decl *Old) { 469 Attr *attr = const_cast<Attr*>(Old->getAttrs()), *tmp; 470 471 while (attr) { 472 tmp = attr; 473 attr = attr->getNext(); 474 475 if (!DeclHasAttr(New, tmp)) { 476 New->addAttr(tmp); 477 } else { 478 tmp->setNext(0); 479 delete(tmp); 480 } 481 } 482 483 Old->invalidateAttrs(); 484} 485 486/// MergeFunctionDecl - We just parsed a function 'New' from 487/// declarator D which has the same name and scope as a previous 488/// declaration 'Old'. Figure out how to resolve this situation, 489/// merging decls or emitting diagnostics as appropriate. 490/// Redeclaration will be set true if this New is a redeclaration OldD. 491/// 492/// In C++, New and Old must be declarations that are not 493/// overloaded. Use IsOverload to determine whether New and Old are 494/// overloaded, and to select the Old declaration that New should be 495/// merged with. 496FunctionDecl * 497Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD, bool &Redeclaration) { 498 assert(!isa<OverloadedFunctionDecl>(OldD) && 499 "Cannot merge with an overloaded function declaration"); 500 501 Redeclaration = false; 502 // Verify the old decl was also a function. 503 FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); 504 if (!Old) { 505 Diag(New->getLocation(), diag::err_redefinition_different_kind) 506 << New->getDeclName(); 507 Diag(OldD->getLocation(), diag::note_previous_definition); 508 return New; 509 } 510 511 // Determine whether the previous declaration was a definition, 512 // implicit declaration, or a declaration. 513 diag::kind PrevDiag; 514 if (Old->isThisDeclarationADefinition()) 515 PrevDiag = diag::note_previous_definition; 516 else if (Old->isImplicit()) 517 PrevDiag = diag::note_previous_implicit_declaration; 518 else 519 PrevDiag = diag::note_previous_declaration; 520 521 QualType OldQType = Context.getCanonicalType(Old->getType()); 522 QualType NewQType = Context.getCanonicalType(New->getType()); 523 524 if (getLangOptions().CPlusPlus) { 525 // (C++98 13.1p2): 526 // Certain function declarations cannot be overloaded: 527 // -- Function declarations that differ only in the return type 528 // cannot be overloaded. 529 QualType OldReturnType 530 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 531 QualType NewReturnType 532 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 533 if (OldReturnType != NewReturnType) { 534 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 535 Diag(Old->getLocation(), PrevDiag); 536 return New; 537 } 538 539 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 540 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 541 if (OldMethod && NewMethod) { 542 // -- Member function declarations with the same name and the 543 // same parameter types cannot be overloaded if any of them 544 // is a static member function declaration. 545 if (OldMethod->isStatic() || NewMethod->isStatic()) { 546 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 547 Diag(Old->getLocation(), PrevDiag); 548 return New; 549 } 550 551 // C++ [class.mem]p1: 552 // [...] A member shall not be declared twice in the 553 // member-specification, except that a nested class or member 554 // class template can be declared and then later defined. 555 if (OldMethod->getLexicalDeclContext() == 556 NewMethod->getLexicalDeclContext()) { 557 unsigned NewDiag; 558 if (isa<CXXConstructorDecl>(OldMethod)) 559 NewDiag = diag::err_constructor_redeclared; 560 else if (isa<CXXDestructorDecl>(NewMethod)) 561 NewDiag = diag::err_destructor_redeclared; 562 else if (isa<CXXConversionDecl>(NewMethod)) 563 NewDiag = diag::err_conv_function_redeclared; 564 else 565 NewDiag = diag::err_member_redeclared; 566 567 Diag(New->getLocation(), NewDiag); 568 Diag(Old->getLocation(), PrevDiag); 569 } 570 } 571 572 // (C++98 8.3.5p3): 573 // All declarations for a function shall agree exactly in both the 574 // return type and the parameter-type-list. 575 if (OldQType == NewQType) { 576 // We have a redeclaration. 577 MergeAttributes(New, Old); 578 Redeclaration = true; 579 return MergeCXXFunctionDecl(New, Old); 580 } 581 582 // Fall through for conflicting redeclarations and redefinitions. 583 } 584 585 // C: Function types need to be compatible, not identical. This handles 586 // duplicate function decls like "void f(int); void f(enum X);" properly. 587 if (!getLangOptions().CPlusPlus && 588 Context.typesAreCompatible(OldQType, NewQType)) { 589 MergeAttributes(New, Old); 590 Redeclaration = true; 591 return New; 592 } 593 594 // A function that has already been declared has been redeclared or defined 595 // with a different type- show appropriate diagnostic 596 597 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 598 // TODO: This is totally simplistic. It should handle merging functions 599 // together etc, merging extern int X; int X; ... 600 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 601 Diag(Old->getLocation(), PrevDiag); 602 return New; 603} 604 605/// Predicate for C "tentative" external object definitions (C99 6.9.2). 606static bool isTentativeDefinition(VarDecl *VD) { 607 if (VD->isFileVarDecl()) 608 return (!VD->getInit() && 609 (VD->getStorageClass() == VarDecl::None || 610 VD->getStorageClass() == VarDecl::Static)); 611 return false; 612} 613 614/// CheckForFileScopedRedefinitions - Make sure we forgo redefinition errors 615/// when dealing with C "tentative" external object definitions (C99 6.9.2). 616void Sema::CheckForFileScopedRedefinitions(Scope *S, VarDecl *VD) { 617 bool VDIsTentative = isTentativeDefinition(VD); 618 bool VDIsIncompleteArray = VD->getType()->isIncompleteArrayType(); 619 620 for (IdentifierResolver::iterator 621 I = IdResolver.begin(VD->getIdentifier(), 622 VD->getDeclContext(), false/*LookInParentCtx*/), 623 E = IdResolver.end(); I != E; ++I) { 624 if (*I != VD && isDeclInScope(*I, VD->getDeclContext(), S)) { 625 VarDecl *OldDecl = dyn_cast<VarDecl>(*I); 626 627 // Handle the following case: 628 // int a[10]; 629 // int a[]; - the code below makes sure we set the correct type. 630 // int a[11]; - this is an error, size isn't 10. 631 if (OldDecl && VDIsTentative && VDIsIncompleteArray && 632 OldDecl->getType()->isConstantArrayType()) 633 VD->setType(OldDecl->getType()); 634 635 // Check for "tentative" definitions. We can't accomplish this in 636 // MergeVarDecl since the initializer hasn't been attached. 637 if (!OldDecl || isTentativeDefinition(OldDecl) || VDIsTentative) 638 continue; 639 640 // Handle __private_extern__ just like extern. 641 if (OldDecl->getStorageClass() != VarDecl::Extern && 642 OldDecl->getStorageClass() != VarDecl::PrivateExtern && 643 VD->getStorageClass() != VarDecl::Extern && 644 VD->getStorageClass() != VarDecl::PrivateExtern) { 645 Diag(VD->getLocation(), diag::err_redefinition) << VD->getDeclName(); 646 Diag(OldDecl->getLocation(), diag::note_previous_definition); 647 } 648 } 649 } 650} 651 652/// MergeVarDecl - We just parsed a variable 'New' which has the same name 653/// and scope as a previous declaration 'Old'. Figure out how to resolve this 654/// situation, merging decls or emitting diagnostics as appropriate. 655/// 656/// Tentative definition rules (C99 6.9.2p2) are checked by 657/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 658/// definitions here, since the initializer hasn't been attached. 659/// 660VarDecl *Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 661 // Verify the old decl was also a variable. 662 VarDecl *Old = dyn_cast<VarDecl>(OldD); 663 if (!Old) { 664 Diag(New->getLocation(), diag::err_redefinition_different_kind) 665 << New->getDeclName(); 666 Diag(OldD->getLocation(), diag::note_previous_definition); 667 return New; 668 } 669 670 MergeAttributes(New, Old); 671 672 // Verify the types match. 673 QualType OldCType = Context.getCanonicalType(Old->getType()); 674 QualType NewCType = Context.getCanonicalType(New->getType()); 675 if (OldCType != NewCType && !Context.typesAreCompatible(OldCType, NewCType)) { 676 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 677 Diag(Old->getLocation(), diag::note_previous_definition); 678 return New; 679 } 680 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 681 if (New->getStorageClass() == VarDecl::Static && 682 (Old->getStorageClass() == VarDecl::None || 683 Old->getStorageClass() == VarDecl::Extern)) { 684 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 685 Diag(Old->getLocation(), diag::note_previous_definition); 686 return New; 687 } 688 // C99 6.2.2p4: Check if we have a non-static decl followed by a static. 689 if (New->getStorageClass() != VarDecl::Static && 690 Old->getStorageClass() == VarDecl::Static) { 691 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 692 Diag(Old->getLocation(), diag::note_previous_definition); 693 return New; 694 } 695 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 696 if (New->getStorageClass() != VarDecl::Extern && !New->isFileVarDecl()) { 697 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 698 Diag(Old->getLocation(), diag::note_previous_definition); 699 } 700 return New; 701} 702 703/// CheckParmsForFunctionDef - Check that the parameters of the given 704/// function are appropriate for the definition of a function. This 705/// takes care of any checks that cannot be performed on the 706/// declaration itself, e.g., that the types of each of the function 707/// parameters are complete. 708bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 709 bool HasInvalidParm = false; 710 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 711 ParmVarDecl *Param = FD->getParamDecl(p); 712 713 // C99 6.7.5.3p4: the parameters in a parameter type list in a 714 // function declarator that is part of a function definition of 715 // that function shall not have incomplete type. 716 if (Param->getType()->isIncompleteType() && 717 !Param->isInvalidDecl()) { 718 Diag(Param->getLocation(), diag::err_typecheck_decl_incomplete_type) 719 << Param->getType(); 720 Param->setInvalidDecl(); 721 HasInvalidParm = true; 722 } 723 724 // C99 6.9.1p5: If the declarator includes a parameter type list, the 725 // declaration of each parameter shall include an identifier. 726 if (Param->getIdentifier() == 0 && !getLangOptions().CPlusPlus) 727 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 728 } 729 730 return HasInvalidParm; 731} 732 733/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 734/// no declarator (e.g. "struct foo;") is parsed. 735Sema::DeclTy *Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 736 // TODO: emit error on 'int;' or 'const enum foo;'. 737 // TODO: emit error on 'typedef int;' 738 // if (!DS.isMissingDeclaratorOk()) Diag(...); 739 740 return dyn_cast_or_null<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 741} 742 743bool Sema::CheckSingleInitializer(Expr *&Init, QualType DeclType) { 744 // Get the type before calling CheckSingleAssignmentConstraints(), since 745 // it can promote the expression. 746 QualType InitType = Init->getType(); 747 748 if (getLangOptions().CPlusPlus) 749 return PerformCopyInitialization(Init, DeclType, "initializing"); 750 751 AssignConvertType ConvTy = CheckSingleAssignmentConstraints(DeclType, Init); 752 return DiagnoseAssignmentResult(ConvTy, Init->getLocStart(), DeclType, 753 InitType, Init, "initializing"); 754} 755 756bool Sema::CheckStringLiteralInit(StringLiteral *strLiteral, QualType &DeclT) { 757 const ArrayType *AT = Context.getAsArrayType(DeclT); 758 759 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) { 760 // C99 6.7.8p14. We have an array of character type with unknown size 761 // being initialized to a string literal. 762 llvm::APSInt ConstVal(32); 763 ConstVal = strLiteral->getByteLength() + 1; 764 // Return a new array type (C99 6.7.8p22). 765 DeclT = Context.getConstantArrayType(IAT->getElementType(), ConstVal, 766 ArrayType::Normal, 0); 767 } else { 768 const ConstantArrayType *CAT = cast<ConstantArrayType>(AT); 769 // C99 6.7.8p14. We have an array of character type with known size. 770 // FIXME: Avoid truncation for 64-bit length strings. 771 if (strLiteral->getByteLength() > (unsigned)CAT->getSize().getZExtValue()) 772 Diag(strLiteral->getSourceRange().getBegin(), 773 diag::warn_initializer_string_for_char_array_too_long) 774 << strLiteral->getSourceRange(); 775 } 776 // Set type from "char *" to "constant array of char". 777 strLiteral->setType(DeclT); 778 // For now, we always return false (meaning success). 779 return false; 780} 781 782StringLiteral *Sema::IsStringLiteralInit(Expr *Init, QualType DeclType) { 783 const ArrayType *AT = Context.getAsArrayType(DeclType); 784 if (AT && AT->getElementType()->isCharType()) { 785 return dyn_cast<StringLiteral>(Init); 786 } 787 return 0; 788} 789 790bool Sema::CheckInitializerTypes(Expr *&Init, QualType &DeclType, 791 SourceLocation InitLoc, 792 DeclarationName InitEntity) { 793 if (DeclType->isDependentType() || Init->isTypeDependent()) 794 return false; 795 796 // C++ [dcl.init.ref]p1: 797 // A variable declared to be a T&, that is "reference to type T" 798 // (8.3.2), shall be initialized by an object, or function, of 799 // type T or by an object that can be converted into a T. 800 if (DeclType->isReferenceType()) 801 return CheckReferenceInit(Init, DeclType); 802 803 // C99 6.7.8p3: The type of the entity to be initialized shall be an array 804 // of unknown size ("[]") or an object type that is not a variable array type. 805 if (const VariableArrayType *VAT = Context.getAsVariableArrayType(DeclType)) 806 return Diag(InitLoc, diag::err_variable_object_no_init) 807 << VAT->getSizeExpr()->getSourceRange(); 808 809 InitListExpr *InitList = dyn_cast<InitListExpr>(Init); 810 if (!InitList) { 811 // FIXME: Handle wide strings 812 if (StringLiteral *strLiteral = IsStringLiteralInit(Init, DeclType)) 813 return CheckStringLiteralInit(strLiteral, DeclType); 814 815 // C++ [dcl.init]p14: 816 // -- If the destination type is a (possibly cv-qualified) class 817 // type: 818 if (getLangOptions().CPlusPlus && DeclType->isRecordType()) { 819 QualType DeclTypeC = Context.getCanonicalType(DeclType); 820 QualType InitTypeC = Context.getCanonicalType(Init->getType()); 821 822 // -- If the initialization is direct-initialization, or if it is 823 // copy-initialization where the cv-unqualified version of the 824 // source type is the same class as, or a derived class of, the 825 // class of the destination, constructors are considered. 826 if ((DeclTypeC.getUnqualifiedType() == InitTypeC.getUnqualifiedType()) || 827 IsDerivedFrom(InitTypeC, DeclTypeC)) { 828 CXXConstructorDecl *Constructor 829 = PerformInitializationByConstructor(DeclType, &Init, 1, 830 InitLoc, Init->getSourceRange(), 831 InitEntity, IK_Copy); 832 return Constructor == 0; 833 } 834 835 // -- Otherwise (i.e., for the remaining copy-initialization 836 // cases), user-defined conversion sequences that can 837 // convert from the source type to the destination type or 838 // (when a conversion function is used) to a derived class 839 // thereof are enumerated as described in 13.3.1.4, and the 840 // best one is chosen through overload resolution 841 // (13.3). If the conversion cannot be done or is 842 // ambiguous, the initialization is ill-formed. The 843 // function selected is called with the initializer 844 // expression as its argument; if the function is a 845 // constructor, the call initializes a temporary of the 846 // destination type. 847 // FIXME: We're pretending to do copy elision here; return to 848 // this when we have ASTs for such things. 849 if (!PerformImplicitConversion(Init, DeclType, "initializing")) 850 return false; 851 852 return Diag(InitLoc, diag::err_typecheck_convert_incompatible) 853 << DeclType << InitEntity << "initializing" 854 << Init->getSourceRange(); 855 } 856 857 // C99 6.7.8p16. 858 if (DeclType->isArrayType()) 859 return Diag(Init->getLocStart(), diag::err_array_init_list_required) 860 << Init->getSourceRange(); 861 862 return CheckSingleInitializer(Init, DeclType); 863 } else if (getLangOptions().CPlusPlus) { 864 // C++ [dcl.init]p14: 865 // [...] If the class is an aggregate (8.5.1), and the initializer 866 // is a brace-enclosed list, see 8.5.1. 867 // 868 // Note: 8.5.1 is handled below; here, we diagnose the case where 869 // we have an initializer list and a destination type that is not 870 // an aggregate. 871 // FIXME: In C++0x, this is yet another form of initialization. 872 if (const RecordType *ClassRec = DeclType->getAsRecordType()) { 873 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 874 if (!ClassDecl->isAggregate()) 875 return Diag(InitLoc, diag::err_init_non_aggr_init_list) 876 << DeclType << Init->getSourceRange(); 877 } 878 } 879 880 InitListChecker CheckInitList(this, InitList, DeclType); 881 return CheckInitList.HadError(); 882} 883 884/// GetNameForDeclarator - Determine the full declaration name for the 885/// given Declarator. 886DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 887 switch (D.getKind()) { 888 case Declarator::DK_Abstract: 889 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 890 return DeclarationName(); 891 892 case Declarator::DK_Normal: 893 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 894 return DeclarationName(D.getIdentifier()); 895 896 case Declarator::DK_Constructor: { 897 QualType Ty = Context.getTypeDeclType((TypeDecl *)D.getDeclaratorIdType()); 898 Ty = Context.getCanonicalType(Ty); 899 return Context.DeclarationNames.getCXXConstructorName(Ty); 900 } 901 902 case Declarator::DK_Destructor: { 903 QualType Ty = Context.getTypeDeclType((TypeDecl *)D.getDeclaratorIdType()); 904 Ty = Context.getCanonicalType(Ty); 905 return Context.DeclarationNames.getCXXDestructorName(Ty); 906 } 907 908 case Declarator::DK_Conversion: { 909 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 910 Ty = Context.getCanonicalType(Ty); 911 return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 912 } 913 914 case Declarator::DK_Operator: 915 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 916 return Context.DeclarationNames.getCXXOperatorName( 917 D.getOverloadedOperator()); 918 } 919 920 assert(false && "Unknown name kind"); 921 return DeclarationName(); 922} 923 924/// isNearlyMatchingMemberFunction - Determine whether the C++ member 925/// functions Declaration and Definition are "nearly" matching. This 926/// heuristic is used to improve diagnostics in the case where an 927/// out-of-line member function definition doesn't match any 928/// declaration within the class. 929static bool isNearlyMatchingMemberFunction(ASTContext &Context, 930 FunctionDecl *Declaration, 931 FunctionDecl *Definition) { 932 if (Declaration->param_size() != Definition->param_size()) 933 return false; 934 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 935 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 936 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 937 938 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 939 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 940 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 941 return false; 942 } 943 944 return true; 945} 946 947Sema::DeclTy * 948Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl, 949 bool IsFunctionDefinition) { 950 ScopedDecl *LastDeclarator = dyn_cast_or_null<ScopedDecl>((Decl *)lastDecl); 951 DeclarationName Name = GetNameForDeclarator(D); 952 953 // All of these full declarators require an identifier. If it doesn't have 954 // one, the ParsedFreeStandingDeclSpec action should be used. 955 if (!Name) { 956 if (!D.getInvalidType()) // Reject this if we think it is valid. 957 Diag(D.getDeclSpec().getSourceRange().getBegin(), 958 diag::err_declarator_need_ident) 959 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 960 return 0; 961 } 962 963 // The scope passed in may not be a decl scope. Zip up the scope tree until 964 // we find one that is. 965 while ((S->getFlags() & Scope::DeclScope) == 0 || 966 (S->getFlags() & Scope::TemplateParamScope) != 0) 967 S = S->getParent(); 968 969 DeclContext *DC; 970 Decl *PrevDecl; 971 ScopedDecl *New; 972 bool InvalidDecl = false; 973 974 // See if this is a redefinition of a variable in the same scope. 975 if (!D.getCXXScopeSpec().isSet()) { 976 DC = CurContext; 977 PrevDecl = LookupDecl(Name, Decl::IDNS_Ordinary, S); 978 } else { // Something like "int foo::x;" 979 DC = static_cast<DeclContext*>(D.getCXXScopeSpec().getScopeRep()); 980 PrevDecl = LookupDecl(Name, Decl::IDNS_Ordinary, S, DC); 981 982 // C++ 7.3.1.2p2: 983 // Members (including explicit specializations of templates) of a named 984 // namespace can also be defined outside that namespace by explicit 985 // qualification of the name being defined, provided that the entity being 986 // defined was already declared in the namespace and the definition appears 987 // after the point of declaration in a namespace that encloses the 988 // declarations namespace. 989 // 990 // Note that we only check the context at this point. We don't yet 991 // have enough information to make sure that PrevDecl is actually 992 // the declaration we want to match. For example, given: 993 // 994 // class X { 995 // void f(); 996 // void f(float); 997 // }; 998 // 999 // void X::f(int) { } // ill-formed 1000 // 1001 // In this case, PrevDecl will point to the overload set 1002 // containing the two f's declared in X, but neither of them 1003 // matches. 1004 if (!CurContext->Encloses(DC)) { 1005 // The qualifying scope doesn't enclose the original declaration. 1006 // Emit diagnostic based on current scope. 1007 SourceLocation L = D.getIdentifierLoc(); 1008 SourceRange R = D.getCXXScopeSpec().getRange(); 1009 if (isa<FunctionDecl>(CurContext)) { 1010 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1011 } else { 1012 Diag(L, diag::err_invalid_declarator_scope) 1013 << Name << cast<NamedDecl>(DC)->getDeclName() << R; 1014 } 1015 InvalidDecl = true; 1016 } 1017 } 1018 1019 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1020 // Maybe we will complain about the shadowed template parameter. 1021 InvalidDecl = InvalidDecl 1022 || DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 1023 // Just pretend that we didn't see the previous declaration. 1024 PrevDecl = 0; 1025 } 1026 1027 // In C++, the previous declaration we find might be a tag type 1028 // (class or enum). In this case, the new declaration will hide the 1029 // tag type. 1030 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag) 1031 PrevDecl = 0; 1032 1033 QualType R = GetTypeForDeclarator(D, S); 1034 assert(!R.isNull() && "GetTypeForDeclarator() returned null type"); 1035 1036 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1037 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1038 if (D.getCXXScopeSpec().isSet()) { 1039 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1040 << D.getCXXScopeSpec().getRange(); 1041 InvalidDecl = true; 1042 // Pretend we didn't see the scope specifier. 1043 DC = 0; 1044 } 1045 1046 // Check that there are no default arguments (C++ only). 1047 if (getLangOptions().CPlusPlus) 1048 CheckExtraCXXDefaultArguments(D); 1049 1050 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, LastDeclarator); 1051 if (!NewTD) return 0; 1052 1053 // Handle attributes prior to checking for duplicates in MergeVarDecl 1054 ProcessDeclAttributes(NewTD, D); 1055 // Merge the decl with the existing one if appropriate. If the decl is 1056 // in an outer scope, it isn't the same thing. 1057 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1058 NewTD = MergeTypeDefDecl(NewTD, PrevDecl); 1059 if (NewTD == 0) return 0; 1060 } 1061 New = NewTD; 1062 if (S->getFnParent() == 0) { 1063 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1064 // then it shall have block scope. 1065 if (NewTD->getUnderlyingType()->isVariablyModifiedType()) { 1066 if (NewTD->getUnderlyingType()->isVariableArrayType()) 1067 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1068 else 1069 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1070 1071 InvalidDecl = true; 1072 } 1073 } 1074 } else if (R.getTypePtr()->isFunctionType()) { 1075 FunctionDecl::StorageClass SC = FunctionDecl::None; 1076 switch (D.getDeclSpec().getStorageClassSpec()) { 1077 default: assert(0 && "Unknown storage class!"); 1078 case DeclSpec::SCS_auto: 1079 case DeclSpec::SCS_register: 1080 case DeclSpec::SCS_mutable: 1081 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_func); 1082 InvalidDecl = true; 1083 break; 1084 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 1085 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 1086 case DeclSpec::SCS_static: SC = FunctionDecl::Static; break; 1087 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 1088 } 1089 1090 bool isInline = D.getDeclSpec().isInlineSpecified(); 1091 // bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1092 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 1093 1094 FunctionDecl *NewFD; 1095 if (D.getKind() == Declarator::DK_Constructor) { 1096 // This is a C++ constructor declaration. 1097 assert(DC->isCXXRecord() && 1098 "Constructors can only be declared in a member context"); 1099 1100 bool isInvalidDecl = CheckConstructorDeclarator(D, R, SC); 1101 1102 // Create the new declaration 1103 NewFD = CXXConstructorDecl::Create(Context, 1104 cast<CXXRecordDecl>(DC), 1105 D.getIdentifierLoc(), Name, R, 1106 isExplicit, isInline, 1107 /*isImplicitlyDeclared=*/false); 1108 1109 if (isInvalidDecl) 1110 NewFD->setInvalidDecl(); 1111 } else if (D.getKind() == Declarator::DK_Destructor) { 1112 // This is a C++ destructor declaration. 1113 if (DC->isCXXRecord()) { 1114 bool isInvalidDecl = CheckDestructorDeclarator(D, R, SC); 1115 1116 NewFD = CXXDestructorDecl::Create(Context, 1117 cast<CXXRecordDecl>(DC), 1118 D.getIdentifierLoc(), Name, R, 1119 isInline, 1120 /*isImplicitlyDeclared=*/false); 1121 1122 if (isInvalidDecl) 1123 NewFD->setInvalidDecl(); 1124 } else { 1125 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 1126 // Create a FunctionDecl to satisfy the function definition parsing 1127 // code path. 1128 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 1129 Name, R, SC, isInline, LastDeclarator, 1130 // FIXME: Move to DeclGroup... 1131 D.getDeclSpec().getSourceRange().getBegin()); 1132 NewFD->setInvalidDecl(); 1133 } 1134 } else if (D.getKind() == Declarator::DK_Conversion) { 1135 if (!DC->isCXXRecord()) { 1136 Diag(D.getIdentifierLoc(), 1137 diag::err_conv_function_not_member); 1138 return 0; 1139 } else { 1140 bool isInvalidDecl = CheckConversionDeclarator(D, R, SC); 1141 1142 NewFD = CXXConversionDecl::Create(Context, 1143 cast<CXXRecordDecl>(DC), 1144 D.getIdentifierLoc(), Name, R, 1145 isInline, isExplicit); 1146 1147 if (isInvalidDecl) 1148 NewFD->setInvalidDecl(); 1149 } 1150 } else if (DC->isCXXRecord()) { 1151 // This is a C++ method declaration. 1152 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 1153 D.getIdentifierLoc(), Name, R, 1154 (SC == FunctionDecl::Static), isInline, 1155 LastDeclarator); 1156 } else { 1157 NewFD = FunctionDecl::Create(Context, DC, 1158 D.getIdentifierLoc(), 1159 Name, R, SC, isInline, LastDeclarator, 1160 // FIXME: Move to DeclGroup... 1161 D.getDeclSpec().getSourceRange().getBegin()); 1162 } 1163 1164 // Handle attributes. 1165 ProcessDeclAttributes(NewFD, D); 1166 1167 // Set the lexical context. If the declarator has a C++ 1168 // scope specifier, the lexical context will be different 1169 // from the semantic context. 1170 NewFD->setLexicalDeclContext(CurContext); 1171 1172 // Handle GNU asm-label extension (encoded as an attribute). 1173 if (Expr *E = (Expr*) D.getAsmLabel()) { 1174 // The parser guarantees this is a string. 1175 StringLiteral *SE = cast<StringLiteral>(E); 1176 NewFD->addAttr(new AsmLabelAttr(std::string(SE->getStrData(), 1177 SE->getByteLength()))); 1178 } 1179 1180 // Copy the parameter declarations from the declarator D to 1181 // the function declaration NewFD, if they are available. 1182 if (D.getNumTypeObjects() > 0) { 1183 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1184 1185 // Create Decl objects for each parameter, adding them to the 1186 // FunctionDecl. 1187 llvm::SmallVector<ParmVarDecl*, 16> Params; 1188 1189 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 1190 // function that takes no arguments, not a function that takes a 1191 // single void argument. 1192 // We let through "const void" here because Sema::GetTypeForDeclarator 1193 // already checks for that case. 1194 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1195 FTI.ArgInfo[0].Param && 1196 ((ParmVarDecl*)FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 1197 // empty arg list, don't push any params. 1198 ParmVarDecl *Param = (ParmVarDecl*)FTI.ArgInfo[0].Param; 1199 1200 // In C++, the empty parameter-type-list must be spelled "void"; a 1201 // typedef of void is not permitted. 1202 if (getLangOptions().CPlusPlus && 1203 Param->getType().getUnqualifiedType() != Context.VoidTy) { 1204 Diag(Param->getLocation(), diag::ext_param_typedef_of_void); 1205 } 1206 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 1207 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 1208 Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 1209 } 1210 1211 NewFD->setParams(&Params[0], Params.size()); 1212 } else if (R->getAsTypedefType()) { 1213 // When we're declaring a function with a typedef, as in the 1214 // following example, we'll need to synthesize (unnamed) 1215 // parameters for use in the declaration. 1216 // 1217 // @code 1218 // typedef void fn(int); 1219 // fn f; 1220 // @endcode 1221 const FunctionTypeProto *FT = R->getAsFunctionTypeProto(); 1222 if (!FT) { 1223 // This is a typedef of a function with no prototype, so we 1224 // don't need to do anything. 1225 } else if ((FT->getNumArgs() == 0) || 1226 (FT->getNumArgs() == 1 && !FT->isVariadic() && 1227 FT->getArgType(0)->isVoidType())) { 1228 // This is a zero-argument function. We don't need to do anything. 1229 } else { 1230 // Synthesize a parameter for each argument type. 1231 llvm::SmallVector<ParmVarDecl*, 16> Params; 1232 for (FunctionTypeProto::arg_type_iterator ArgType = FT->arg_type_begin(); 1233 ArgType != FT->arg_type_end(); ++ArgType) { 1234 Params.push_back(ParmVarDecl::Create(Context, DC, 1235 SourceLocation(), 0, 1236 *ArgType, VarDecl::None, 1237 0, 0)); 1238 } 1239 1240 NewFD->setParams(&Params[0], Params.size()); 1241 } 1242 } 1243 1244 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) 1245 InvalidDecl = InvalidDecl || CheckConstructor(Constructor); 1246 else if (isa<CXXDestructorDecl>(NewFD)) 1247 cast<CXXRecordDecl>(NewFD->getParent())->setUserDeclaredDestructor(true); 1248 else if (CXXConversionDecl *Conversion = dyn_cast<CXXConversionDecl>(NewFD)) 1249 ActOnConversionDeclarator(Conversion); 1250 1251 // Extra checking for C++ overloaded operators (C++ [over.oper]). 1252 if (NewFD->isOverloadedOperator() && 1253 CheckOverloadedOperatorDeclaration(NewFD)) 1254 NewFD->setInvalidDecl(); 1255 1256 // Merge the decl with the existing one if appropriate. Since C functions 1257 // are in a flat namespace, make sure we consider decls in outer scopes. 1258 if (PrevDecl && 1259 (!getLangOptions().CPlusPlus||isDeclInScope(PrevDecl, DC, S))) { 1260 bool Redeclaration = false; 1261 1262 // If C++, determine whether NewFD is an overload of PrevDecl or 1263 // a declaration that requires merging. If it's an overload, 1264 // there's no more work to do here; we'll just add the new 1265 // function to the scope. 1266 OverloadedFunctionDecl::function_iterator MatchedDecl; 1267 if (!getLangOptions().CPlusPlus || 1268 !IsOverload(NewFD, PrevDecl, MatchedDecl)) { 1269 Decl *OldDecl = PrevDecl; 1270 1271 // If PrevDecl was an overloaded function, extract the 1272 // FunctionDecl that matched. 1273 if (isa<OverloadedFunctionDecl>(PrevDecl)) 1274 OldDecl = *MatchedDecl; 1275 1276 // NewFD and PrevDecl represent declarations that need to be 1277 // merged. 1278 NewFD = MergeFunctionDecl(NewFD, OldDecl, Redeclaration); 1279 1280 if (NewFD == 0) return 0; 1281 if (Redeclaration) { 1282 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 1283 1284 if (OldDecl == PrevDecl) { 1285 // Remove the name binding for the previous 1286 // declaration. 1287 if (S->isDeclScope(PrevDecl)) { 1288 IdResolver.RemoveDecl(cast<NamedDecl>(PrevDecl)); 1289 S->RemoveDecl(PrevDecl); 1290 } 1291 1292 // Introduce the new binding for this declaration. 1293 IdResolver.AddDecl(NewFD); 1294 if (getLangOptions().CPlusPlus && NewFD->getParent()) 1295 NewFD->getParent()->insert(Context, NewFD); 1296 1297 // Add the redeclaration to the current scope, since we'll 1298 // be skipping PushOnScopeChains. 1299 S->AddDecl(NewFD); 1300 } else { 1301 // We need to update the OverloadedFunctionDecl with the 1302 // latest declaration of this function, so that name 1303 // lookup will always refer to the latest declaration of 1304 // this function. 1305 *MatchedDecl = NewFD; 1306 } 1307 1308 if (getLangOptions().CPlusPlus) { 1309 // Add this declaration to the current context. 1310 CurContext->addDecl(Context, NewFD, false); 1311 1312 // Check default arguments now that we have merged decls. 1313 CheckCXXDefaultArguments(NewFD); 1314 1315 // An out-of-line member function declaration must also be a 1316 // definition (C++ [dcl.meaning]p1). 1317 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 1318 !InvalidDecl) { 1319 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 1320 << D.getCXXScopeSpec().getRange(); 1321 NewFD->setInvalidDecl(); 1322 } 1323 } 1324 1325 return NewFD; 1326 } 1327 } 1328 1329 if (!Redeclaration && D.getCXXScopeSpec().isSet()) { 1330 // The user tried to provide an out-of-line definition for a 1331 // member function, but there was no such member function 1332 // declared (C++ [class.mfct]p2). For example: 1333 // 1334 // class X { 1335 // void f() const; 1336 // }; 1337 // 1338 // void X::f() { } // ill-formed 1339 // 1340 // Complain about this problem, and attempt to suggest close 1341 // matches (e.g., those that differ only in cv-qualifiers and 1342 // whether the parameter types are references). 1343 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 1344 << cast<CXXRecordDecl>(DC)->getDeclName() 1345 << D.getCXXScopeSpec().getRange(); 1346 InvalidDecl = true; 1347 1348 PrevDecl = LookupDecl(Name, Decl::IDNS_Ordinary, S, DC); 1349 if (!PrevDecl) { 1350 // Nothing to suggest. 1351 } else if (OverloadedFunctionDecl *Ovl 1352 = dyn_cast<OverloadedFunctionDecl>(PrevDecl)) { 1353 for (OverloadedFunctionDecl::function_iterator 1354 Func = Ovl->function_begin(), 1355 FuncEnd = Ovl->function_end(); 1356 Func != FuncEnd; ++Func) { 1357 if (isNearlyMatchingMemberFunction(Context, *Func, NewFD)) 1358 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 1359 1360 } 1361 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(PrevDecl)) { 1362 // Suggest this no matter how mismatched it is; it's the only 1363 // thing we have. 1364 unsigned diag; 1365 if (isNearlyMatchingMemberFunction(Context, Method, NewFD)) 1366 diag = diag::note_member_def_close_match; 1367 else if (Method->getBody()) 1368 diag = diag::note_previous_definition; 1369 else 1370 diag = diag::note_previous_declaration; 1371 Diag(Method->getLocation(), diag); 1372 } 1373 1374 PrevDecl = 0; 1375 } 1376 } 1377 New = NewFD; 1378 1379 if (getLangOptions().CPlusPlus) { 1380 // In C++, check default arguments now that we have merged decls. 1381 CheckCXXDefaultArguments(NewFD); 1382 1383 // An out-of-line member function declaration must also be a 1384 // definition (C++ [dcl.meaning]p1). 1385 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet()) { 1386 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 1387 << D.getCXXScopeSpec().getRange(); 1388 InvalidDecl = true; 1389 } 1390 } 1391 } else { 1392 // Check that there are no default arguments (C++ only). 1393 if (getLangOptions().CPlusPlus) 1394 CheckExtraCXXDefaultArguments(D); 1395 1396 if (R.getTypePtr()->isObjCInterfaceType()) { 1397 Diag(D.getIdentifierLoc(), diag::err_statically_allocated_object) 1398 << D.getIdentifier(); 1399 InvalidDecl = true; 1400 } 1401 1402 VarDecl *NewVD; 1403 VarDecl::StorageClass SC; 1404 switch (D.getDeclSpec().getStorageClassSpec()) { 1405 default: assert(0 && "Unknown storage class!"); 1406 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1407 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1408 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1409 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1410 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1411 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1412 case DeclSpec::SCS_mutable: 1413 // mutable can only appear on non-static class members, so it's always 1414 // an error here 1415 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1416 InvalidDecl = true; 1417 SC = VarDecl::None; 1418 break; 1419 } 1420 1421 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1422 if (!II) { 1423 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1424 << Name.getAsString(); 1425 return 0; 1426 } 1427 1428 if (DC->isCXXRecord()) { 1429 // This is a static data member for a C++ class. 1430 NewVD = CXXClassVarDecl::Create(Context, cast<CXXRecordDecl>(DC), 1431 D.getIdentifierLoc(), II, 1432 R, LastDeclarator); 1433 } else { 1434 bool ThreadSpecified = D.getDeclSpec().isThreadSpecified(); 1435 if (S->getFnParent() == 0) { 1436 // C99 6.9p2: The storage-class specifiers auto and register shall not 1437 // appear in the declaration specifiers in an external declaration. 1438 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 1439 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 1440 InvalidDecl = true; 1441 } 1442 } 1443 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1444 II, R, SC, LastDeclarator, 1445 // FIXME: Move to DeclGroup... 1446 D.getDeclSpec().getSourceRange().getBegin()); 1447 NewVD->setThreadSpecified(ThreadSpecified); 1448 } 1449 // Handle attributes prior to checking for duplicates in MergeVarDecl 1450 ProcessDeclAttributes(NewVD, D); 1451 1452 // Handle GNU asm-label extension (encoded as an attribute). 1453 if (Expr *E = (Expr*) D.getAsmLabel()) { 1454 // The parser guarantees this is a string. 1455 StringLiteral *SE = cast<StringLiteral>(E); 1456 NewVD->addAttr(new AsmLabelAttr(std::string(SE->getStrData(), 1457 SE->getByteLength()))); 1458 } 1459 1460 // Emit an error if an address space was applied to decl with local storage. 1461 // This includes arrays of objects with address space qualifiers, but not 1462 // automatic variables that point to other address spaces. 1463 // ISO/IEC TR 18037 S5.1.2 1464 if (NewVD->hasLocalStorage() && (NewVD->getType().getAddressSpace() != 0)) { 1465 Diag(D.getIdentifierLoc(), diag::err_as_qualified_auto_decl); 1466 InvalidDecl = true; 1467 } 1468 // Merge the decl with the existing one if appropriate. If the decl is 1469 // in an outer scope, it isn't the same thing. 1470 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1471 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 1472 // The user tried to define a non-static data member 1473 // out-of-line (C++ [dcl.meaning]p1). 1474 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 1475 << D.getCXXScopeSpec().getRange(); 1476 NewVD->Destroy(Context); 1477 return 0; 1478 } 1479 1480 NewVD = MergeVarDecl(NewVD, PrevDecl); 1481 if (NewVD == 0) return 0; 1482 1483 if (D.getCXXScopeSpec().isSet()) { 1484 // No previous declaration in the qualifying scope. 1485 Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 1486 << Name << D.getCXXScopeSpec().getRange(); 1487 InvalidDecl = true; 1488 } 1489 } 1490 New = NewVD; 1491 } 1492 1493 // Set the lexical context. If the declarator has a C++ scope specifier, the 1494 // lexical context will be different from the semantic context. 1495 New->setLexicalDeclContext(CurContext); 1496 1497 // If this has an identifier, add it to the scope stack. 1498 if (Name) 1499 PushOnScopeChains(New, S); 1500 // If any semantic error occurred, mark the decl as invalid. 1501 if (D.getInvalidType() || InvalidDecl) 1502 New->setInvalidDecl(); 1503 1504 return New; 1505} 1506 1507void Sema::InitializerElementNotConstant(const Expr *Init) { 1508 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 1509 << Init->getSourceRange(); 1510} 1511 1512bool Sema::CheckAddressConstantExpressionLValue(const Expr* Init) { 1513 switch (Init->getStmtClass()) { 1514 default: 1515 InitializerElementNotConstant(Init); 1516 return true; 1517 case Expr::ParenExprClass: { 1518 const ParenExpr* PE = cast<ParenExpr>(Init); 1519 return CheckAddressConstantExpressionLValue(PE->getSubExpr()); 1520 } 1521 case Expr::CompoundLiteralExprClass: 1522 return cast<CompoundLiteralExpr>(Init)->isFileScope(); 1523 case Expr::DeclRefExprClass: { 1524 const Decl *D = cast<DeclRefExpr>(Init)->getDecl(); 1525 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1526 if (VD->hasGlobalStorage()) 1527 return false; 1528 InitializerElementNotConstant(Init); 1529 return true; 1530 } 1531 if (isa<FunctionDecl>(D)) 1532 return false; 1533 InitializerElementNotConstant(Init); 1534 return true; 1535 } 1536 case Expr::MemberExprClass: { 1537 const MemberExpr *M = cast<MemberExpr>(Init); 1538 if (M->isArrow()) 1539 return CheckAddressConstantExpression(M->getBase()); 1540 return CheckAddressConstantExpressionLValue(M->getBase()); 1541 } 1542 case Expr::ArraySubscriptExprClass: { 1543 // FIXME: Should we pedwarn for "x[0+0]" (where x is a pointer)? 1544 const ArraySubscriptExpr *ASE = cast<ArraySubscriptExpr>(Init); 1545 return CheckAddressConstantExpression(ASE->getBase()) || 1546 CheckArithmeticConstantExpression(ASE->getIdx()); 1547 } 1548 case Expr::StringLiteralClass: 1549 case Expr::PredefinedExprClass: 1550 return false; 1551 case Expr::UnaryOperatorClass: { 1552 const UnaryOperator *Exp = cast<UnaryOperator>(Init); 1553 1554 // C99 6.6p9 1555 if (Exp->getOpcode() == UnaryOperator::Deref) 1556 return CheckAddressConstantExpression(Exp->getSubExpr()); 1557 1558 InitializerElementNotConstant(Init); 1559 return true; 1560 } 1561 } 1562} 1563 1564bool Sema::CheckAddressConstantExpression(const Expr* Init) { 1565 switch (Init->getStmtClass()) { 1566 default: 1567 InitializerElementNotConstant(Init); 1568 return true; 1569 case Expr::ParenExprClass: 1570 return CheckAddressConstantExpression(cast<ParenExpr>(Init)->getSubExpr()); 1571 case Expr::StringLiteralClass: 1572 case Expr::ObjCStringLiteralClass: 1573 return false; 1574 case Expr::CallExprClass: 1575 case Expr::CXXOperatorCallExprClass: 1576 // __builtin___CFStringMakeConstantString is a valid constant l-value. 1577 if (cast<CallExpr>(Init)->isBuiltinCall() == 1578 Builtin::BI__builtin___CFStringMakeConstantString) 1579 return false; 1580 1581 InitializerElementNotConstant(Init); 1582 return true; 1583 1584 case Expr::UnaryOperatorClass: { 1585 const UnaryOperator *Exp = cast<UnaryOperator>(Init); 1586 1587 // C99 6.6p9 1588 if (Exp->getOpcode() == UnaryOperator::AddrOf) 1589 return CheckAddressConstantExpressionLValue(Exp->getSubExpr()); 1590 1591 if (Exp->getOpcode() == UnaryOperator::Extension) 1592 return CheckAddressConstantExpression(Exp->getSubExpr()); 1593 1594 InitializerElementNotConstant(Init); 1595 return true; 1596 } 1597 case Expr::BinaryOperatorClass: { 1598 // FIXME: Should we pedwarn for expressions like "a + 1 + 2"? 1599 const BinaryOperator *Exp = cast<BinaryOperator>(Init); 1600 1601 Expr *PExp = Exp->getLHS(); 1602 Expr *IExp = Exp->getRHS(); 1603 if (IExp->getType()->isPointerType()) 1604 std::swap(PExp, IExp); 1605 1606 // FIXME: Should we pedwarn if IExp isn't an integer constant expression? 1607 return CheckAddressConstantExpression(PExp) || 1608 CheckArithmeticConstantExpression(IExp); 1609 } 1610 case Expr::ImplicitCastExprClass: 1611 case Expr::CStyleCastExprClass: { 1612 const Expr* SubExpr = cast<CastExpr>(Init)->getSubExpr(); 1613 if (Init->getStmtClass() == Expr::ImplicitCastExprClass) { 1614 // Check for implicit promotion 1615 if (SubExpr->getType()->isFunctionType() || 1616 SubExpr->getType()->isArrayType()) 1617 return CheckAddressConstantExpressionLValue(SubExpr); 1618 } 1619 1620 // Check for pointer->pointer cast 1621 if (SubExpr->getType()->isPointerType()) 1622 return CheckAddressConstantExpression(SubExpr); 1623 1624 if (SubExpr->getType()->isIntegralType()) { 1625 // Check for the special-case of a pointer->int->pointer cast; 1626 // this isn't standard, but some code requires it. See 1627 // PR2720 for an example. 1628 if (const CastExpr* SubCast = dyn_cast<CastExpr>(SubExpr)) { 1629 if (SubCast->getSubExpr()->getType()->isPointerType()) { 1630 unsigned IntWidth = Context.getIntWidth(SubCast->getType()); 1631 unsigned PointerWidth = Context.getTypeSize(Context.VoidPtrTy); 1632 if (IntWidth >= PointerWidth) { 1633 return CheckAddressConstantExpression(SubCast->getSubExpr()); 1634 } 1635 } 1636 } 1637 } 1638 if (SubExpr->getType()->isArithmeticType()) { 1639 return CheckArithmeticConstantExpression(SubExpr); 1640 } 1641 1642 InitializerElementNotConstant(Init); 1643 return true; 1644 } 1645 case Expr::ConditionalOperatorClass: { 1646 // FIXME: Should we pedwarn here? 1647 const ConditionalOperator *Exp = cast<ConditionalOperator>(Init); 1648 if (!Exp->getCond()->getType()->isArithmeticType()) { 1649 InitializerElementNotConstant(Init); 1650 return true; 1651 } 1652 if (CheckArithmeticConstantExpression(Exp->getCond())) 1653 return true; 1654 if (Exp->getLHS() && 1655 CheckAddressConstantExpression(Exp->getLHS())) 1656 return true; 1657 return CheckAddressConstantExpression(Exp->getRHS()); 1658 } 1659 case Expr::AddrLabelExprClass: 1660 return false; 1661 } 1662} 1663 1664static const Expr* FindExpressionBaseAddress(const Expr* E); 1665 1666static const Expr* FindExpressionBaseAddressLValue(const Expr* E) { 1667 switch (E->getStmtClass()) { 1668 default: 1669 return E; 1670 case Expr::ParenExprClass: { 1671 const ParenExpr* PE = cast<ParenExpr>(E); 1672 return FindExpressionBaseAddressLValue(PE->getSubExpr()); 1673 } 1674 case Expr::MemberExprClass: { 1675 const MemberExpr *M = cast<MemberExpr>(E); 1676 if (M->isArrow()) 1677 return FindExpressionBaseAddress(M->getBase()); 1678 return FindExpressionBaseAddressLValue(M->getBase()); 1679 } 1680 case Expr::ArraySubscriptExprClass: { 1681 const ArraySubscriptExpr *ASE = cast<ArraySubscriptExpr>(E); 1682 return FindExpressionBaseAddress(ASE->getBase()); 1683 } 1684 case Expr::UnaryOperatorClass: { 1685 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1686 1687 if (Exp->getOpcode() == UnaryOperator::Deref) 1688 return FindExpressionBaseAddress(Exp->getSubExpr()); 1689 1690 return E; 1691 } 1692 } 1693} 1694 1695static const Expr* FindExpressionBaseAddress(const Expr* E) { 1696 switch (E->getStmtClass()) { 1697 default: 1698 return E; 1699 case Expr::ParenExprClass: { 1700 const ParenExpr* PE = cast<ParenExpr>(E); 1701 return FindExpressionBaseAddress(PE->getSubExpr()); 1702 } 1703 case Expr::UnaryOperatorClass: { 1704 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1705 1706 // C99 6.6p9 1707 if (Exp->getOpcode() == UnaryOperator::AddrOf) 1708 return FindExpressionBaseAddressLValue(Exp->getSubExpr()); 1709 1710 if (Exp->getOpcode() == UnaryOperator::Extension) 1711 return FindExpressionBaseAddress(Exp->getSubExpr()); 1712 1713 return E; 1714 } 1715 case Expr::BinaryOperatorClass: { 1716 const BinaryOperator *Exp = cast<BinaryOperator>(E); 1717 1718 Expr *PExp = Exp->getLHS(); 1719 Expr *IExp = Exp->getRHS(); 1720 if (IExp->getType()->isPointerType()) 1721 std::swap(PExp, IExp); 1722 1723 return FindExpressionBaseAddress(PExp); 1724 } 1725 case Expr::ImplicitCastExprClass: { 1726 const Expr* SubExpr = cast<ImplicitCastExpr>(E)->getSubExpr(); 1727 1728 // Check for implicit promotion 1729 if (SubExpr->getType()->isFunctionType() || 1730 SubExpr->getType()->isArrayType()) 1731 return FindExpressionBaseAddressLValue(SubExpr); 1732 1733 // Check for pointer->pointer cast 1734 if (SubExpr->getType()->isPointerType()) 1735 return FindExpressionBaseAddress(SubExpr); 1736 1737 // We assume that we have an arithmetic expression here; 1738 // if we don't, we'll figure it out later 1739 return 0; 1740 } 1741 case Expr::CStyleCastExprClass: { 1742 const Expr* SubExpr = cast<CastExpr>(E)->getSubExpr(); 1743 1744 // Check for pointer->pointer cast 1745 if (SubExpr->getType()->isPointerType()) 1746 return FindExpressionBaseAddress(SubExpr); 1747 1748 // We assume that we have an arithmetic expression here; 1749 // if we don't, we'll figure it out later 1750 return 0; 1751 } 1752 } 1753} 1754 1755bool Sema::CheckArithmeticConstantExpression(const Expr* Init) { 1756 switch (Init->getStmtClass()) { 1757 default: 1758 InitializerElementNotConstant(Init); 1759 return true; 1760 case Expr::ParenExprClass: { 1761 const ParenExpr* PE = cast<ParenExpr>(Init); 1762 return CheckArithmeticConstantExpression(PE->getSubExpr()); 1763 } 1764 case Expr::FloatingLiteralClass: 1765 case Expr::IntegerLiteralClass: 1766 case Expr::CharacterLiteralClass: 1767 case Expr::ImaginaryLiteralClass: 1768 case Expr::TypesCompatibleExprClass: 1769 case Expr::CXXBoolLiteralExprClass: 1770 return false; 1771 case Expr::CallExprClass: 1772 case Expr::CXXOperatorCallExprClass: { 1773 const CallExpr *CE = cast<CallExpr>(Init); 1774 1775 // Allow any constant foldable calls to builtins. 1776 if (CE->isBuiltinCall() && CE->isEvaluatable(Context)) 1777 return false; 1778 1779 InitializerElementNotConstant(Init); 1780 return true; 1781 } 1782 case Expr::DeclRefExprClass: { 1783 const Decl *D = cast<DeclRefExpr>(Init)->getDecl(); 1784 if (isa<EnumConstantDecl>(D)) 1785 return false; 1786 InitializerElementNotConstant(Init); 1787 return true; 1788 } 1789 case Expr::CompoundLiteralExprClass: 1790 // Allow "(vector type){2,4}"; normal C constraints don't allow this, 1791 // but vectors are allowed to be magic. 1792 if (Init->getType()->isVectorType()) 1793 return false; 1794 InitializerElementNotConstant(Init); 1795 return true; 1796 case Expr::UnaryOperatorClass: { 1797 const UnaryOperator *Exp = cast<UnaryOperator>(Init); 1798 1799 switch (Exp->getOpcode()) { 1800 // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. 1801 // See C99 6.6p3. 1802 default: 1803 InitializerElementNotConstant(Init); 1804 return true; 1805 case UnaryOperator::OffsetOf: 1806 if (Exp->getSubExpr()->getType()->isConstantSizeType()) 1807 return false; 1808 InitializerElementNotConstant(Init); 1809 return true; 1810 case UnaryOperator::Extension: 1811 case UnaryOperator::LNot: 1812 case UnaryOperator::Plus: 1813 case UnaryOperator::Minus: 1814 case UnaryOperator::Not: 1815 return CheckArithmeticConstantExpression(Exp->getSubExpr()); 1816 } 1817 } 1818 case Expr::SizeOfAlignOfExprClass: { 1819 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(Init); 1820 // Special check for void types, which are allowed as an extension 1821 if (Exp->getTypeOfArgument()->isVoidType()) 1822 return false; 1823 // alignof always evaluates to a constant. 1824 // FIXME: is sizeof(int[3.0]) a constant expression? 1825 if (Exp->isSizeOf() && !Exp->getTypeOfArgument()->isConstantSizeType()) { 1826 InitializerElementNotConstant(Init); 1827 return true; 1828 } 1829 return false; 1830 } 1831 case Expr::BinaryOperatorClass: { 1832 const BinaryOperator *Exp = cast<BinaryOperator>(Init); 1833 1834 if (Exp->getLHS()->getType()->isArithmeticType() && 1835 Exp->getRHS()->getType()->isArithmeticType()) { 1836 return CheckArithmeticConstantExpression(Exp->getLHS()) || 1837 CheckArithmeticConstantExpression(Exp->getRHS()); 1838 } 1839 1840 if (Exp->getLHS()->getType()->isPointerType() && 1841 Exp->getRHS()->getType()->isPointerType()) { 1842 const Expr* LHSBase = FindExpressionBaseAddress(Exp->getLHS()); 1843 const Expr* RHSBase = FindExpressionBaseAddress(Exp->getRHS()); 1844 1845 // Only allow a null (constant integer) base; we could 1846 // allow some additional cases if necessary, but this 1847 // is sufficient to cover offsetof-like constructs. 1848 if (!LHSBase && !RHSBase) { 1849 return CheckAddressConstantExpression(Exp->getLHS()) || 1850 CheckAddressConstantExpression(Exp->getRHS()); 1851 } 1852 } 1853 1854 InitializerElementNotConstant(Init); 1855 return true; 1856 } 1857 case Expr::ImplicitCastExprClass: 1858 case Expr::CStyleCastExprClass: { 1859 const Expr *SubExpr = cast<CastExpr>(Init)->getSubExpr(); 1860 if (SubExpr->getType()->isArithmeticType()) 1861 return CheckArithmeticConstantExpression(SubExpr); 1862 1863 if (SubExpr->getType()->isPointerType()) { 1864 const Expr* Base = FindExpressionBaseAddress(SubExpr); 1865 // If the pointer has a null base, this is an offsetof-like construct 1866 if (!Base) 1867 return CheckAddressConstantExpression(SubExpr); 1868 } 1869 1870 InitializerElementNotConstant(Init); 1871 return true; 1872 } 1873 case Expr::ConditionalOperatorClass: { 1874 const ConditionalOperator *Exp = cast<ConditionalOperator>(Init); 1875 1876 // If GNU extensions are disabled, we require all operands to be arithmetic 1877 // constant expressions. 1878 if (getLangOptions().NoExtensions) { 1879 return CheckArithmeticConstantExpression(Exp->getCond()) || 1880 (Exp->getLHS() && CheckArithmeticConstantExpression(Exp->getLHS())) || 1881 CheckArithmeticConstantExpression(Exp->getRHS()); 1882 } 1883 1884 // Otherwise, we have to emulate some of the behavior of fold here. 1885 // Basically GCC treats things like "4 ? 1 : somefunc()" as a constant 1886 // because it can constant fold things away. To retain compatibility with 1887 // GCC code, we see if we can fold the condition to a constant (which we 1888 // should always be able to do in theory). If so, we only require the 1889 // specified arm of the conditional to be a constant. This is a horrible 1890 // hack, but is require by real world code that uses __builtin_constant_p. 1891 APValue Val; 1892 if (!Exp->getCond()->Evaluate(Val, Context)) { 1893 // If Evaluate couldn't fold it, CheckArithmeticConstantExpression 1894 // won't be able to either. Use it to emit the diagnostic though. 1895 bool Res = CheckArithmeticConstantExpression(Exp->getCond()); 1896 assert(Res && "Evaluate couldn't evaluate this constant?"); 1897 return Res; 1898 } 1899 1900 // Verify that the side following the condition is also a constant. 1901 const Expr *TrueSide = Exp->getLHS(), *FalseSide = Exp->getRHS(); 1902 if (Val.getInt() == 0) 1903 std::swap(TrueSide, FalseSide); 1904 1905 if (TrueSide && CheckArithmeticConstantExpression(TrueSide)) 1906 return true; 1907 1908 // Okay, the evaluated side evaluates to a constant, so we accept this. 1909 // Check to see if the other side is obviously not a constant. If so, 1910 // emit a warning that this is a GNU extension. 1911 if (FalseSide && !FalseSide->isEvaluatable(Context)) 1912 Diag(Init->getExprLoc(), 1913 diag::ext_typecheck_expression_not_constant_but_accepted) 1914 << FalseSide->getSourceRange(); 1915 return false; 1916 } 1917 } 1918} 1919 1920bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 1921 Expr::EvalResult Result; 1922 1923 Init = Init->IgnoreParens(); 1924 1925 if (Init->Evaluate(Result, Context) && !Result.HasSideEffects) 1926 return false; 1927 1928 // Look through CXXDefaultArgExprs; they have no meaning in this context. 1929 if (CXXDefaultArgExpr* DAE = dyn_cast<CXXDefaultArgExpr>(Init)) 1930 return CheckForConstantInitializer(DAE->getExpr(), DclT); 1931 1932 if (CompoundLiteralExpr *e = dyn_cast<CompoundLiteralExpr>(Init)) 1933 return CheckForConstantInitializer(e->getInitializer(), DclT); 1934 1935 if (InitListExpr *Exp = dyn_cast<InitListExpr>(Init)) { 1936 unsigned numInits = Exp->getNumInits(); 1937 for (unsigned i = 0; i < numInits; i++) { 1938 // FIXME: Need to get the type of the declaration for C++, 1939 // because it could be a reference? 1940 if (CheckForConstantInitializer(Exp->getInit(i), 1941 Exp->getInit(i)->getType())) 1942 return true; 1943 } 1944 return false; 1945 } 1946 1947 // FIXME: We can probably remove some of this code below, now that 1948 // Expr::Evaluate is doing the heavy lifting for scalars. 1949 1950 if (Init->isNullPointerConstant(Context)) 1951 return false; 1952 if (Init->getType()->isArithmeticType()) { 1953 QualType InitTy = Context.getCanonicalType(Init->getType()) 1954 .getUnqualifiedType(); 1955 if (InitTy == Context.BoolTy) { 1956 // Special handling for pointers implicitly cast to bool; 1957 // (e.g. "_Bool rr = &rr;"). This is only legal at the top level. 1958 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Init)) { 1959 Expr* SubE = ICE->getSubExpr(); 1960 if (SubE->getType()->isPointerType() || 1961 SubE->getType()->isArrayType() || 1962 SubE->getType()->isFunctionType()) { 1963 return CheckAddressConstantExpression(Init); 1964 } 1965 } 1966 } else if (InitTy->isIntegralType()) { 1967 Expr* SubE = 0; 1968 if (CastExpr* CE = dyn_cast<CastExpr>(Init)) 1969 SubE = CE->getSubExpr(); 1970 // Special check for pointer cast to int; we allow as an extension 1971 // an address constant cast to an integer if the integer 1972 // is of an appropriate width (this sort of code is apparently used 1973 // in some places). 1974 // FIXME: Add pedwarn? 1975 // FIXME: Don't allow bitfields here! Need the FieldDecl for that. 1976 if (SubE && (SubE->getType()->isPointerType() || 1977 SubE->getType()->isArrayType() || 1978 SubE->getType()->isFunctionType())) { 1979 unsigned IntWidth = Context.getTypeSize(Init->getType()); 1980 unsigned PointerWidth = Context.getTypeSize(Context.VoidPtrTy); 1981 if (IntWidth >= PointerWidth) 1982 return CheckAddressConstantExpression(Init); 1983 } 1984 } 1985 1986 return CheckArithmeticConstantExpression(Init); 1987 } 1988 1989 if (Init->getType()->isPointerType()) 1990 return CheckAddressConstantExpression(Init); 1991 1992 // An array type at the top level that isn't an init-list must 1993 // be a string literal 1994 if (Init->getType()->isArrayType()) 1995 return false; 1996 1997 if (Init->getType()->isFunctionType()) 1998 return false; 1999 2000 // Allow block exprs at top level. 2001 if (Init->getType()->isBlockPointerType()) 2002 return false; 2003 2004 InitializerElementNotConstant(Init); 2005 return true; 2006} 2007 2008void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init) { 2009 Decl *RealDecl = static_cast<Decl *>(dcl); 2010 Expr *Init = static_cast<Expr *>(init.release()); 2011 assert(Init && "missing initializer"); 2012 2013 // If there is no declaration, there was an error parsing it. Just ignore 2014 // the initializer. 2015 if (RealDecl == 0) { 2016 delete Init; 2017 return; 2018 } 2019 2020 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2021 if (!VDecl) { 2022 Diag(dyn_cast<ScopedDecl>(RealDecl)->getLocation(), 2023 diag::err_illegal_initializer); 2024 RealDecl->setInvalidDecl(); 2025 return; 2026 } 2027 // Get the decls type and save a reference for later, since 2028 // CheckInitializerTypes may change it. 2029 QualType DclT = VDecl->getType(), SavT = DclT; 2030 if (VDecl->isBlockVarDecl()) { 2031 VarDecl::StorageClass SC = VDecl->getStorageClass(); 2032 if (SC == VarDecl::Extern) { // C99 6.7.8p5 2033 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2034 VDecl->setInvalidDecl(); 2035 } else if (!VDecl->isInvalidDecl()) { 2036 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2037 VDecl->getDeclName())) 2038 VDecl->setInvalidDecl(); 2039 2040 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2041 if (!getLangOptions().CPlusPlus) { 2042 if (SC == VarDecl::Static) // C99 6.7.8p4. 2043 CheckForConstantInitializer(Init, DclT); 2044 } 2045 } 2046 } else if (VDecl->isFileVarDecl()) { 2047 if (VDecl->getStorageClass() == VarDecl::Extern) 2048 Diag(VDecl->getLocation(), diag::warn_extern_init); 2049 if (!VDecl->isInvalidDecl()) 2050 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2051 VDecl->getDeclName())) 2052 VDecl->setInvalidDecl(); 2053 2054 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2055 if (!getLangOptions().CPlusPlus) { 2056 // C99 6.7.8p4. All file scoped initializers need to be constant. 2057 CheckForConstantInitializer(Init, DclT); 2058 } 2059 } 2060 // If the type changed, it means we had an incomplete type that was 2061 // completed by the initializer. For example: 2062 // int ary[] = { 1, 3, 5 }; 2063 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2064 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2065 VDecl->setType(DclT); 2066 Init->setType(DclT); 2067 } 2068 2069 // Attach the initializer to the decl. 2070 VDecl->setInit(Init); 2071 return; 2072} 2073 2074void Sema::ActOnUninitializedDecl(DeclTy *dcl) { 2075 Decl *RealDecl = static_cast<Decl *>(dcl); 2076 2077 // If there is no declaration, there was an error parsing it. Just ignore it. 2078 if (RealDecl == 0) 2079 return; 2080 2081 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2082 QualType Type = Var->getType(); 2083 // C++ [dcl.init.ref]p3: 2084 // The initializer can be omitted for a reference only in a 2085 // parameter declaration (8.3.5), in the declaration of a 2086 // function return type, in the declaration of a class member 2087 // within its class declaration (9.2), and where the extern 2088 // specifier is explicitly used. 2089 if (Type->isReferenceType() && 2090 Var->getStorageClass() != VarDecl::Extern && 2091 Var->getStorageClass() != VarDecl::PrivateExtern) { 2092 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2093 << Var->getDeclName() 2094 << SourceRange(Var->getLocation(), Var->getLocation()); 2095 Var->setInvalidDecl(); 2096 return; 2097 } 2098 2099 // C++ [dcl.init]p9: 2100 // 2101 // If no initializer is specified for an object, and the object 2102 // is of (possibly cv-qualified) non-POD class type (or array 2103 // thereof), the object shall be default-initialized; if the 2104 // object is of const-qualified type, the underlying class type 2105 // shall have a user-declared default constructor. 2106 if (getLangOptions().CPlusPlus) { 2107 QualType InitType = Type; 2108 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2109 InitType = Array->getElementType(); 2110 if (Var->getStorageClass() != VarDecl::Extern && 2111 Var->getStorageClass() != VarDecl::PrivateExtern && 2112 InitType->isRecordType()) { 2113 const CXXConstructorDecl *Constructor 2114 = PerformInitializationByConstructor(InitType, 0, 0, 2115 Var->getLocation(), 2116 SourceRange(Var->getLocation(), 2117 Var->getLocation()), 2118 Var->getDeclName(), 2119 IK_Default); 2120 if (!Constructor) 2121 Var->setInvalidDecl(); 2122 } 2123 } 2124 2125#if 0 2126 // FIXME: Temporarily disabled because we are not properly parsing 2127 // linkage specifications on declarations, e.g., 2128 // 2129 // extern "C" const CGPoint CGPointerZero; 2130 // 2131 // C++ [dcl.init]p9: 2132 // 2133 // If no initializer is specified for an object, and the 2134 // object is of (possibly cv-qualified) non-POD class type (or 2135 // array thereof), the object shall be default-initialized; if 2136 // the object is of const-qualified type, the underlying class 2137 // type shall have a user-declared default 2138 // constructor. Otherwise, if no initializer is specified for 2139 // an object, the object and its subobjects, if any, have an 2140 // indeterminate initial value; if the object or any of its 2141 // subobjects are of const-qualified type, the program is 2142 // ill-formed. 2143 // 2144 // This isn't technically an error in C, so we don't diagnose it. 2145 // 2146 // FIXME: Actually perform the POD/user-defined default 2147 // constructor check. 2148 if (getLangOptions().CPlusPlus && 2149 Context.getCanonicalType(Type).isConstQualified() && 2150 Var->getStorageClass() != VarDecl::Extern) 2151 Diag(Var->getLocation(), diag::err_const_var_requires_init) 2152 << Var->getName() 2153 << SourceRange(Var->getLocation(), Var->getLocation()); 2154#endif 2155 } 2156} 2157 2158/// The declarators are chained together backwards, reverse the list. 2159Sema::DeclTy *Sema::FinalizeDeclaratorGroup(Scope *S, DeclTy *group) { 2160 // Often we have single declarators, handle them quickly. 2161 Decl *GroupDecl = static_cast<Decl*>(group); 2162 if (GroupDecl == 0) 2163 return 0; 2164 2165 ScopedDecl *Group = dyn_cast<ScopedDecl>(GroupDecl); 2166 ScopedDecl *NewGroup = 0; 2167 if (Group->getNextDeclarator() == 0) 2168 NewGroup = Group; 2169 else { // reverse the list. 2170 while (Group) { 2171 ScopedDecl *Next = Group->getNextDeclarator(); 2172 Group->setNextDeclarator(NewGroup); 2173 NewGroup = Group; 2174 Group = Next; 2175 } 2176 } 2177 // Perform semantic analysis that depends on having fully processed both 2178 // the declarator and initializer. 2179 for (ScopedDecl *ID = NewGroup; ID; ID = ID->getNextDeclarator()) { 2180 VarDecl *IDecl = dyn_cast<VarDecl>(ID); 2181 if (!IDecl) 2182 continue; 2183 QualType T = IDecl->getType(); 2184 2185 if (T->isVariableArrayType()) { 2186 const VariableArrayType *VAT = 2187 cast<VariableArrayType>(T.getUnqualifiedType()); 2188 2189 // FIXME: This won't give the correct result for 2190 // int a[10][n]; 2191 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2192 if (IDecl->isFileVarDecl()) { 2193 Diag(IDecl->getLocation(), diag::err_vla_decl_in_file_scope) << 2194 SizeRange; 2195 2196 IDecl->setInvalidDecl(); 2197 } else { 2198 // C99 6.7.5.2p2: If an identifier is declared to be an object with 2199 // static storage duration, it shall not have a variable length array. 2200 if (IDecl->getStorageClass() == VarDecl::Static) { 2201 Diag(IDecl->getLocation(), diag::err_vla_decl_has_static_storage) 2202 << SizeRange; 2203 IDecl->setInvalidDecl(); 2204 } else if (IDecl->getStorageClass() == VarDecl::Extern) { 2205 Diag(IDecl->getLocation(), diag::err_vla_decl_has_extern_linkage) 2206 << SizeRange; 2207 IDecl->setInvalidDecl(); 2208 } 2209 } 2210 } else if (T->isVariablyModifiedType()) { 2211 if (IDecl->isFileVarDecl()) { 2212 Diag(IDecl->getLocation(), diag::err_vm_decl_in_file_scope); 2213 IDecl->setInvalidDecl(); 2214 } else { 2215 if (IDecl->getStorageClass() == VarDecl::Extern) { 2216 Diag(IDecl->getLocation(), diag::err_vm_decl_has_extern_linkage); 2217 IDecl->setInvalidDecl(); 2218 } 2219 } 2220 } 2221 2222 // Block scope. C99 6.7p7: If an identifier for an object is declared with 2223 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 2224 if (IDecl->isBlockVarDecl() && 2225 IDecl->getStorageClass() != VarDecl::Extern) { 2226 if (T->isIncompleteType() && !IDecl->isInvalidDecl()) { 2227 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type)<<T; 2228 IDecl->setInvalidDecl(); 2229 } 2230 } 2231 // File scope. C99 6.9.2p2: A declaration of an identifier for and 2232 // object that has file scope without an initializer, and without a 2233 // storage-class specifier or with the storage-class specifier "static", 2234 // constitutes a tentative definition. Note: A tentative definition with 2235 // external linkage is valid (C99 6.2.2p5). 2236 if (isTentativeDefinition(IDecl)) { 2237 if (T->isIncompleteArrayType()) { 2238 // C99 6.9.2 (p2, p5): Implicit initialization causes an incomplete 2239 // array to be completed. Don't issue a diagnostic. 2240 } else if (T->isIncompleteType() && !IDecl->isInvalidDecl()) { 2241 // C99 6.9.2p3: If the declaration of an identifier for an object is 2242 // a tentative definition and has internal linkage (C99 6.2.2p3), the 2243 // declared type shall not be an incomplete type. 2244 Diag(IDecl->getLocation(), diag::err_typecheck_decl_incomplete_type)<<T; 2245 IDecl->setInvalidDecl(); 2246 } 2247 } 2248 if (IDecl->isFileVarDecl()) 2249 CheckForFileScopedRedefinitions(S, IDecl); 2250 } 2251 return NewGroup; 2252} 2253 2254/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 2255/// to introduce parameters into function prototype scope. 2256Sema::DeclTy * 2257Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 2258 const DeclSpec &DS = D.getDeclSpec(); 2259 2260 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 2261 VarDecl::StorageClass StorageClass = VarDecl::None; 2262 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2263 StorageClass = VarDecl::Register; 2264 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2265 Diag(DS.getStorageClassSpecLoc(), 2266 diag::err_invalid_storage_class_in_func_decl); 2267 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2268 } 2269 if (DS.isThreadSpecified()) { 2270 Diag(DS.getThreadSpecLoc(), 2271 diag::err_invalid_storage_class_in_func_decl); 2272 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2273 } 2274 2275 // Check that there are no default arguments inside the type of this 2276 // parameter (C++ only). 2277 if (getLangOptions().CPlusPlus) 2278 CheckExtraCXXDefaultArguments(D); 2279 2280 // In this context, we *do not* check D.getInvalidType(). If the declarator 2281 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 2282 // though it will not reflect the user specified type. 2283 QualType parmDeclType = GetTypeForDeclarator(D, S); 2284 2285 assert(!parmDeclType.isNull() && "GetTypeForDeclarator() returned null type"); 2286 2287 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 2288 // Can this happen for params? We already checked that they don't conflict 2289 // among each other. Here they can only shadow globals, which is ok. 2290 IdentifierInfo *II = D.getIdentifier(); 2291 if (Decl *PrevDecl = LookupDecl(II, Decl::IDNS_Ordinary, S)) { 2292 if (PrevDecl->isTemplateParameter()) { 2293 // Maybe we will complain about the shadowed template parameter. 2294 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2295 // Just pretend that we didn't see the previous declaration. 2296 PrevDecl = 0; 2297 } else if (S->isDeclScope(PrevDecl)) { 2298 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 2299 2300 // Recover by removing the name 2301 II = 0; 2302 D.SetIdentifier(0, D.getIdentifierLoc()); 2303 } 2304 } 2305 2306 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 2307 // Doing the promotion here has a win and a loss. The win is the type for 2308 // both Decl's and DeclRefExpr's will match (a convenient invariant for the 2309 // code generator). The loss is the orginal type isn't preserved. For example: 2310 // 2311 // void func(int parmvardecl[5]) { // convert "int [5]" to "int *" 2312 // int blockvardecl[5]; 2313 // sizeof(parmvardecl); // size == 4 2314 // sizeof(blockvardecl); // size == 20 2315 // } 2316 // 2317 // For expressions, all implicit conversions are captured using the 2318 // ImplicitCastExpr AST node (we have no such mechanism for Decl's). 2319 // 2320 // FIXME: If a source translation tool needs to see the original type, then 2321 // we need to consider storing both types (in ParmVarDecl)... 2322 // 2323 if (parmDeclType->isArrayType()) { 2324 // int x[restrict 4] -> int *restrict 2325 parmDeclType = Context.getArrayDecayedType(parmDeclType); 2326 } else if (parmDeclType->isFunctionType()) 2327 parmDeclType = Context.getPointerType(parmDeclType); 2328 2329 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, 2330 D.getIdentifierLoc(), II, 2331 parmDeclType, StorageClass, 2332 0, 0); 2333 2334 if (D.getInvalidType()) 2335 New->setInvalidDecl(); 2336 2337 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 2338 if (D.getCXXScopeSpec().isSet()) { 2339 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 2340 << D.getCXXScopeSpec().getRange(); 2341 New->setInvalidDecl(); 2342 } 2343 2344 // Add the parameter declaration into this scope. 2345 S->AddDecl(New); 2346 if (II) 2347 IdResolver.AddDecl(New); 2348 2349 ProcessDeclAttributes(New, D); 2350 return New; 2351 2352} 2353 2354Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 2355 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 2356 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2357 "Not a function declarator!"); 2358 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2359 2360 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 2361 // for a K&R function. 2362 if (!FTI.hasPrototype) { 2363 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2364 if (FTI.ArgInfo[i].Param == 0) { 2365 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 2366 << FTI.ArgInfo[i].Ident; 2367 // Implicitly declare the argument as type 'int' for lack of a better 2368 // type. 2369 DeclSpec DS; 2370 const char* PrevSpec; // unused 2371 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 2372 PrevSpec); 2373 Declarator ParamD(DS, Declarator::KNRTypeListContext); 2374 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 2375 FTI.ArgInfo[i].Param = ActOnParamDeclarator(FnBodyScope, ParamD); 2376 } 2377 } 2378 } else { 2379 // FIXME: Diagnose arguments without names in C. 2380 } 2381 2382 Scope *ParentScope = FnBodyScope->getParent(); 2383 2384 return ActOnStartOfFunctionDef(FnBodyScope, 2385 ActOnDeclarator(ParentScope, D, 0, 2386 /*IsFunctionDefinition=*/true)); 2387} 2388 2389Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclTy *D) { 2390 Decl *decl = static_cast<Decl*>(D); 2391 FunctionDecl *FD = cast<FunctionDecl>(decl); 2392 2393 // See if this is a redefinition. 2394 const FunctionDecl *Definition; 2395 if (FD->getBody(Definition)) { 2396 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 2397 Diag(Definition->getLocation(), diag::note_previous_definition); 2398 } 2399 2400 PushDeclContext(FnBodyScope, FD); 2401 2402 // Check the validity of our function parameters 2403 CheckParmsForFunctionDef(FD); 2404 2405 // Introduce our parameters into the function scope 2406 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 2407 ParmVarDecl *Param = FD->getParamDecl(p); 2408 // If this has an identifier, add it to the scope stack. 2409 if (Param->getIdentifier()) 2410 PushOnScopeChains(Param, FnBodyScope); 2411 } 2412 2413 return FD; 2414} 2415 2416Sema::DeclTy *Sema::ActOnFinishFunctionBody(DeclTy *D, StmtArg BodyArg) { 2417 Decl *dcl = static_cast<Decl *>(D); 2418 Stmt *Body = static_cast<Stmt*>(BodyArg.release()); 2419 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 2420 FD->setBody(Body); 2421 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 2422 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 2423 MD->setBody((Stmt*)Body); 2424 } else 2425 return 0; 2426 PopDeclContext(); 2427 // Verify and clean out per-function state. 2428 2429 // Check goto/label use. 2430 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 2431 I = LabelMap.begin(), E = LabelMap.end(); I != E; ++I) { 2432 // Verify that we have no forward references left. If so, there was a goto 2433 // or address of a label taken, but no definition of it. Label fwd 2434 // definitions are indicated with a null substmt. 2435 if (I->second->getSubStmt() == 0) { 2436 LabelStmt *L = I->second; 2437 // Emit error. 2438 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 2439 2440 // At this point, we have gotos that use the bogus label. Stitch it into 2441 // the function body so that they aren't leaked and that the AST is well 2442 // formed. 2443 if (Body) { 2444 L->setSubStmt(new NullStmt(L->getIdentLoc())); 2445 cast<CompoundStmt>(Body)->push_back(L); 2446 } else { 2447 // The whole function wasn't parsed correctly, just delete this. 2448 delete L; 2449 } 2450 } 2451 } 2452 LabelMap.clear(); 2453 2454 return D; 2455} 2456 2457/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 2458/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 2459ScopedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 2460 IdentifierInfo &II, Scope *S) { 2461 // Extension in C99. Legal in C90, but warn about it. 2462 if (getLangOptions().C99) 2463 Diag(Loc, diag::ext_implicit_function_decl) << &II; 2464 else 2465 Diag(Loc, diag::warn_implicit_function_decl) << &II; 2466 2467 // FIXME: handle stuff like: 2468 // void foo() { extern float X(); } 2469 // void bar() { X(); } <-- implicit decl for X in another scope. 2470 2471 // Set a Declarator for the implicit definition: int foo(); 2472 const char *Dummy; 2473 DeclSpec DS; 2474 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 2475 Error = Error; // Silence warning. 2476 assert(!Error && "Error setting up implicit decl!"); 2477 Declarator D(DS, Declarator::BlockContext); 2478 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, 0, 0, 0, Loc)); 2479 D.SetIdentifier(&II, Loc); 2480 2481 // Insert this function into translation-unit scope. 2482 2483 DeclContext *PrevDC = CurContext; 2484 CurContext = Context.getTranslationUnitDecl(); 2485 2486 FunctionDecl *FD = 2487 dyn_cast<FunctionDecl>(static_cast<Decl*>(ActOnDeclarator(TUScope, D, 0))); 2488 FD->setImplicit(); 2489 2490 CurContext = PrevDC; 2491 2492 return FD; 2493} 2494 2495 2496TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 2497 ScopedDecl *LastDeclarator) { 2498 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 2499 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 2500 2501 // Scope manipulation handled by caller. 2502 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 2503 D.getIdentifierLoc(), 2504 D.getIdentifier(), 2505 T, LastDeclarator); 2506 if (D.getInvalidType()) 2507 NewTD->setInvalidDecl(); 2508 return NewTD; 2509} 2510 2511/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 2512/// former case, Name will be non-null. In the later case, Name will be null. 2513/// TagType indicates what kind of tag this is. TK indicates whether this is a 2514/// reference/declaration/definition of a tag. 2515Sema::DeclTy *Sema::ActOnTag(Scope *S, unsigned TagType, TagKind TK, 2516 SourceLocation KWLoc, const CXXScopeSpec &SS, 2517 IdentifierInfo *Name, SourceLocation NameLoc, 2518 AttributeList *Attr) { 2519 // If this is not a definition, it must have a name. 2520 assert((Name != 0 || TK == TK_Definition) && 2521 "Nameless record must be a definition!"); 2522 2523 TagDecl::TagKind Kind; 2524 switch (TagType) { 2525 default: assert(0 && "Unknown tag type!"); 2526 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 2527 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 2528 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 2529 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 2530 } 2531 2532 DeclContext *DC = CurContext; 2533 ScopedDecl *PrevDecl = 0; 2534 2535 if (Name && SS.isNotEmpty()) { 2536 // We have a nested-name tag ('struct foo::bar'). 2537 2538 // Check for invalid 'foo::'. 2539 if (SS.isInvalid()) { 2540 Name = 0; 2541 goto CreateNewDecl; 2542 } 2543 2544 DC = static_cast<DeclContext*>(SS.getScopeRep()); 2545 // Look-up name inside 'foo::'. 2546 PrevDecl = dyn_cast_or_null<TagDecl>(LookupDecl(Name, Decl::IDNS_Tag,S,DC)); 2547 2548 // A tag 'foo::bar' must already exist. 2549 if (PrevDecl == 0) { 2550 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 2551 Name = 0; 2552 goto CreateNewDecl; 2553 } 2554 } else { 2555 // If this is a named struct, check to see if there was a previous forward 2556 // declaration or definition. 2557 // Use ScopedDecl instead of TagDecl, because a NamespaceDecl may come up. 2558 PrevDecl = dyn_cast_or_null<ScopedDecl>(LookupDecl(Name, Decl::IDNS_Tag,S)); 2559 } 2560 2561 if (PrevDecl && PrevDecl->isTemplateParameter()) { 2562 // Maybe we will complain about the shadowed template parameter. 2563 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 2564 // Just pretend that we didn't see the previous declaration. 2565 PrevDecl = 0; 2566 } 2567 2568 if (PrevDecl) { 2569 assert((isa<TagDecl>(PrevDecl) || isa<NamespaceDecl>(PrevDecl)) && 2570 "unexpected Decl type"); 2571 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 2572 // If this is a use of a previous tag, or if the tag is already declared 2573 // in the same scope (so that the definition/declaration completes or 2574 // rementions the tag), reuse the decl. 2575 if (TK == TK_Reference || isDeclInScope(PrevDecl, DC, S)) { 2576 // Make sure that this wasn't declared as an enum and now used as a 2577 // struct or something similar. 2578 if (PrevTagDecl->getTagKind() != Kind) { 2579 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 2580 Diag(PrevDecl->getLocation(), diag::note_previous_use); 2581 // Recover by making this an anonymous redefinition. 2582 Name = 0; 2583 PrevDecl = 0; 2584 } else { 2585 // If this is a use, just return the declaration we found. 2586 2587 // FIXME: In the future, return a variant or some other clue 2588 // for the consumer of this Decl to know it doesn't own it. 2589 // For our current ASTs this shouldn't be a problem, but will 2590 // need to be changed with DeclGroups. 2591 if (TK == TK_Reference) 2592 return PrevDecl; 2593 2594 // Diagnose attempts to redefine a tag. 2595 if (TK == TK_Definition) { 2596 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 2597 Diag(NameLoc, diag::err_redefinition) << Name; 2598 Diag(Def->getLocation(), diag::note_previous_definition); 2599 // If this is a redefinition, recover by making this struct be 2600 // anonymous, which will make any later references get the previous 2601 // definition. 2602 Name = 0; 2603 PrevDecl = 0; 2604 } 2605 // Okay, this is definition of a previously declared or referenced 2606 // tag PrevDecl. We're going to create a new Decl for it. 2607 } 2608 } 2609 // If we get here we have (another) forward declaration or we 2610 // have a definition. Just create a new decl. 2611 } else { 2612 // If we get here, this is a definition of a new tag type in a nested 2613 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 2614 // new decl/type. We set PrevDecl to NULL so that the entities 2615 // have distinct types. 2616 PrevDecl = 0; 2617 } 2618 // If we get here, we're going to create a new Decl. If PrevDecl 2619 // is non-NULL, it's a definition of the tag declared by 2620 // PrevDecl. If it's NULL, we have a new definition. 2621 } else { 2622 // PrevDecl is a namespace. 2623 if (isDeclInScope(PrevDecl, DC, S)) { 2624 // The tag name clashes with a namespace name, issue an error and 2625 // recover by making this tag be anonymous. 2626 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 2627 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2628 Name = 0; 2629 PrevDecl = 0; 2630 } else { 2631 // The existing declaration isn't relevant to us; we're in a 2632 // new scope, so clear out the previous declaration. 2633 PrevDecl = 0; 2634 } 2635 } 2636 } 2637 2638CreateNewDecl: 2639 2640 // If there is an identifier, use the location of the identifier as the 2641 // location of the decl, otherwise use the location of the struct/union 2642 // keyword. 2643 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 2644 2645 // Otherwise, create a new declaration. If there is a previous 2646 // declaration of the same entity, the two will be linked via 2647 // PrevDecl. 2648 TagDecl *New; 2649 if (Kind == TagDecl::TK_enum) { 2650 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 2651 // enum X { A, B, C } D; D should chain to X. 2652 New = EnumDecl::Create(Context, DC, Loc, Name, 2653 cast_or_null<EnumDecl>(PrevDecl)); 2654 // If this is an undefined enum, warn. 2655 if (TK != TK_Definition) Diag(Loc, diag::ext_forward_ref_enum); 2656 } else { 2657 // struct/union/class 2658 2659 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 2660 // struct X { int A; } D; D should chain to X. 2661 if (getLangOptions().CPlusPlus) 2662 // FIXME: Look for a way to use RecordDecl for simple structs. 2663 New = CXXRecordDecl::Create(Context, Kind, DC, Loc, Name, 2664 cast_or_null<CXXRecordDecl>(PrevDecl)); 2665 else 2666 New = RecordDecl::Create(Context, Kind, DC, Loc, Name, 2667 cast_or_null<RecordDecl>(PrevDecl)); 2668 } 2669 2670 if (Kind != TagDecl::TK_enum) { 2671 // Handle #pragma pack: if the #pragma pack stack has non-default 2672 // alignment, make up a packed attribute for this decl. These 2673 // attributes are checked when the ASTContext lays out the 2674 // structure. 2675 // 2676 // It is important for implementing the correct semantics that this 2677 // happen here (in act on tag decl). The #pragma pack stack is 2678 // maintained as a result of parser callbacks which can occur at 2679 // many points during the parsing of a struct declaration (because 2680 // the #pragma tokens are effectively skipped over during the 2681 // parsing of the struct). 2682 if (unsigned Alignment = PackContext.getAlignment()) 2683 New->addAttr(new PackedAttr(Alignment * 8)); 2684 } 2685 2686 if (Attr) 2687 ProcessDeclAttributeList(New, Attr); 2688 2689 // Set the lexical context. If the tag has a C++ scope specifier, the 2690 // lexical context will be different from the semantic context. 2691 New->setLexicalDeclContext(CurContext); 2692 2693 // If this has an identifier, add it to the scope stack. 2694 if (Name) { 2695 // The scope passed in may not be a decl scope. Zip up the scope tree until 2696 // we find one that is. 2697 while ((S->getFlags() & Scope::DeclScope) == 0) 2698 S = S->getParent(); 2699 2700 // Add it to the decl chain. 2701 PushOnScopeChains(New, S); 2702 } 2703 2704 return New; 2705} 2706 2707 2708/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2709/// types into constant array types in certain situations which would otherwise 2710/// be errors (for GCC compatibility). 2711static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2712 ASTContext &Context) { 2713 // This method tries to turn a variable array into a constant 2714 // array even when the size isn't an ICE. This is necessary 2715 // for compatibility with code that depends on gcc's buggy 2716 // constant expression folding, like struct {char x[(int)(char*)2];} 2717 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2718 if (!VLATy) return QualType(); 2719 2720 APValue Result; 2721 if (!VLATy->getSizeExpr() || 2722 !VLATy->getSizeExpr()->Evaluate(Result, Context)) 2723 return QualType(); 2724 2725 assert(Result.isInt() && "Size expressions must be integers!"); 2726 llvm::APSInt &Res = Result.getInt(); 2727 if (Res > llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) 2728 return Context.getConstantArrayType(VLATy->getElementType(), 2729 Res, ArrayType::Normal, 0); 2730 return QualType(); 2731} 2732 2733bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 2734 QualType FieldTy, const Expr *BitWidth) { 2735 // FIXME: 6.7.2.1p4 - verify the field type. 2736 2737 llvm::APSInt Value; 2738 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 2739 return true; 2740 2741 // Zero-width bitfield is ok for anonymous field. 2742 if (Value == 0 && FieldName) 2743 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 2744 2745 if (Value.isNegative()) 2746 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) << FieldName; 2747 2748 uint64_t TypeSize = Context.getTypeSize(FieldTy); 2749 // FIXME: We won't need the 0 size once we check that the field type is valid. 2750 if (TypeSize && Value.getZExtValue() > TypeSize) 2751 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 2752 << FieldName << (unsigned)TypeSize; 2753 2754 return false; 2755} 2756 2757/// ActOnField - Each field of a struct/union/class is passed into this in order 2758/// to create a FieldDecl object for it. 2759Sema::DeclTy *Sema::ActOnField(Scope *S, DeclTy *TagD, 2760 SourceLocation DeclStart, 2761 Declarator &D, ExprTy *BitfieldWidth) { 2762 IdentifierInfo *II = D.getIdentifier(); 2763 Expr *BitWidth = (Expr*)BitfieldWidth; 2764 SourceLocation Loc = DeclStart; 2765 RecordDecl *Record = (RecordDecl *)TagD; 2766 if (II) Loc = D.getIdentifierLoc(); 2767 2768 // FIXME: Unnamed fields can be handled in various different ways, for 2769 // example, unnamed unions inject all members into the struct namespace! 2770 2771 QualType T = GetTypeForDeclarator(D, S); 2772 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 2773 bool InvalidDecl = false; 2774 2775 // C99 6.7.2.1p8: A member of a structure or union may have any type other 2776 // than a variably modified type. 2777 if (T->isVariablyModifiedType()) { 2778 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context); 2779 if (!FixedTy.isNull()) { 2780 Diag(Loc, diag::warn_illegal_constant_array_size); 2781 T = FixedTy; 2782 } else { 2783 Diag(Loc, diag::err_typecheck_field_variable_size); 2784 T = Context.IntTy; 2785 InvalidDecl = true; 2786 } 2787 } 2788 2789 if (BitWidth) { 2790 if (VerifyBitField(Loc, II, T, BitWidth)) 2791 InvalidDecl = true; 2792 } else { 2793 // Not a bitfield. 2794 2795 // validate II. 2796 2797 } 2798 2799 // FIXME: Chain fielddecls together. 2800 FieldDecl *NewFD; 2801 2802 // FIXME: We don't want CurContext for C, do we? No, we'll need some 2803 // other way to determine the current RecordDecl. 2804 NewFD = FieldDecl::Create(Context, Record, 2805 Loc, II, T, BitWidth, 2806 D.getDeclSpec().getStorageClassSpec() == 2807 DeclSpec::SCS_mutable, 2808 /*PrevDecl=*/0); 2809 2810 if (getLangOptions().CPlusPlus) 2811 CheckExtraCXXDefaultArguments(D); 2812 2813 ProcessDeclAttributes(NewFD, D); 2814 2815 if (D.getInvalidType() || InvalidDecl) 2816 NewFD->setInvalidDecl(); 2817 2818 if (II && getLangOptions().CPlusPlus) 2819 PushOnScopeChains(NewFD, S); 2820 else 2821 Record->addDecl(Context, NewFD); 2822 2823 return NewFD; 2824} 2825 2826/// TranslateIvarVisibility - Translate visibility from a token ID to an 2827/// AST enum value. 2828static ObjCIvarDecl::AccessControl 2829TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 2830 switch (ivarVisibility) { 2831 default: assert(0 && "Unknown visitibility kind"); 2832 case tok::objc_private: return ObjCIvarDecl::Private; 2833 case tok::objc_public: return ObjCIvarDecl::Public; 2834 case tok::objc_protected: return ObjCIvarDecl::Protected; 2835 case tok::objc_package: return ObjCIvarDecl::Package; 2836 } 2837} 2838 2839/// ActOnIvar - Each ivar field of an objective-c class is passed into this 2840/// in order to create an IvarDecl object for it. 2841Sema::DeclTy *Sema::ActOnIvar(Scope *S, 2842 SourceLocation DeclStart, 2843 Declarator &D, ExprTy *BitfieldWidth, 2844 tok::ObjCKeywordKind Visibility) { 2845 IdentifierInfo *II = D.getIdentifier(); 2846 Expr *BitWidth = (Expr*)BitfieldWidth; 2847 SourceLocation Loc = DeclStart; 2848 if (II) Loc = D.getIdentifierLoc(); 2849 2850 // FIXME: Unnamed fields can be handled in various different ways, for 2851 // example, unnamed unions inject all members into the struct namespace! 2852 2853 QualType T = GetTypeForDeclarator(D, S); 2854 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 2855 bool InvalidDecl = false; 2856 2857 if (BitWidth) { 2858 // TODO: Validate. 2859 //printf("WARNING: BITFIELDS IGNORED!\n"); 2860 2861 // 6.7.2.1p3 2862 // 6.7.2.1p4 2863 2864 } else { 2865 // Not a bitfield. 2866 2867 // validate II. 2868 2869 } 2870 2871 // C99 6.7.2.1p8: A member of a structure or union may have any type other 2872 // than a variably modified type. 2873 if (T->isVariablyModifiedType()) { 2874 Diag(Loc, diag::err_typecheck_ivar_variable_size); 2875 InvalidDecl = true; 2876 } 2877 2878 // Get the visibility (access control) for this ivar. 2879 ObjCIvarDecl::AccessControl ac = 2880 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 2881 : ObjCIvarDecl::None; 2882 2883 // Construct the decl. 2884 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, Loc, II, T, ac, 2885 (Expr *)BitfieldWidth); 2886 2887 // Process attributes attached to the ivar. 2888 ProcessDeclAttributes(NewID, D); 2889 2890 if (D.getInvalidType() || InvalidDecl) 2891 NewID->setInvalidDecl(); 2892 2893 return NewID; 2894} 2895 2896void Sema::ActOnFields(Scope* S, 2897 SourceLocation RecLoc, DeclTy *RecDecl, 2898 DeclTy **Fields, unsigned NumFields, 2899 SourceLocation LBrac, SourceLocation RBrac, 2900 AttributeList *Attr) { 2901 Decl *EnclosingDecl = static_cast<Decl*>(RecDecl); 2902 assert(EnclosingDecl && "missing record or interface decl"); 2903 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 2904 2905 if (Record) 2906 if (RecordDecl* DefRecord = Record->getDefinition(Context)) { 2907 // Diagnose code like: 2908 // struct S { struct S {} X; }; 2909 // We discover this when we complete the outer S. Reject and ignore the 2910 // outer S. 2911 Diag(DefRecord->getLocation(), diag::err_nested_redefinition) 2912 << DefRecord->getDeclName(); 2913 Diag(RecLoc, diag::note_previous_definition); 2914 Record->setInvalidDecl(); 2915 return; 2916 } 2917 2918 // Verify that all the fields are okay. 2919 unsigned NumNamedMembers = 0; 2920 llvm::SmallVector<FieldDecl*, 32> RecFields; 2921 llvm::SmallSet<const IdentifierInfo*, 32> FieldIDs; 2922 2923 for (unsigned i = 0; i != NumFields; ++i) { 2924 2925 FieldDecl *FD = cast_or_null<FieldDecl>(static_cast<Decl*>(Fields[i])); 2926 assert(FD && "missing field decl"); 2927 2928 // Remember all fields. 2929 RecFields.push_back(FD); 2930 2931 // Get the type for the field. 2932 Type *FDTy = FD->getType().getTypePtr(); 2933 2934 // C99 6.7.2.1p2 - A field may not be a function type. 2935 if (FDTy->isFunctionType()) { 2936 Diag(FD->getLocation(), diag::err_field_declared_as_function) 2937 << FD->getDeclName(); 2938 FD->setInvalidDecl(); 2939 EnclosingDecl->setInvalidDecl(); 2940 continue; 2941 } 2942 // C99 6.7.2.1p2 - A field may not be an incomplete type except... 2943 if (FDTy->isIncompleteType()) { 2944 if (!Record) { // Incomplete ivar type is always an error. 2945 Diag(FD->getLocation(), diag::err_field_incomplete) <<FD->getDeclName(); 2946 FD->setInvalidDecl(); 2947 EnclosingDecl->setInvalidDecl(); 2948 continue; 2949 } 2950 if (i != NumFields-1 || // ... that the last member ... 2951 !Record->isStruct() || // ... of a structure ... 2952 !FDTy->isArrayType()) { //... may have incomplete array type. 2953 Diag(FD->getLocation(), diag::err_field_incomplete) <<FD->getDeclName(); 2954 FD->setInvalidDecl(); 2955 EnclosingDecl->setInvalidDecl(); 2956 continue; 2957 } 2958 if (NumNamedMembers < 1) { //... must have more than named member ... 2959 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 2960 << FD->getDeclName(); 2961 FD->setInvalidDecl(); 2962 EnclosingDecl->setInvalidDecl(); 2963 continue; 2964 } 2965 // Okay, we have a legal flexible array member at the end of the struct. 2966 if (Record) 2967 Record->setHasFlexibleArrayMember(true); 2968 } 2969 /// C99 6.7.2.1p2 - a struct ending in a flexible array member cannot be the 2970 /// field of another structure or the element of an array. 2971 if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 2972 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 2973 // If this is a member of a union, then entire union becomes "flexible". 2974 if (Record && Record->isUnion()) { 2975 Record->setHasFlexibleArrayMember(true); 2976 } else { 2977 // If this is a struct/class and this is not the last element, reject 2978 // it. Note that GCC supports variable sized arrays in the middle of 2979 // structures. 2980 if (i != NumFields-1) { 2981 Diag(FD->getLocation(), diag::err_variable_sized_type_in_struct) 2982 << FD->getDeclName(); 2983 FD->setInvalidDecl(); 2984 EnclosingDecl->setInvalidDecl(); 2985 continue; 2986 } 2987 // We support flexible arrays at the end of structs in other structs 2988 // as an extension. 2989 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 2990 << FD->getDeclName(); 2991 if (Record) 2992 Record->setHasFlexibleArrayMember(true); 2993 } 2994 } 2995 } 2996 /// A field cannot be an Objective-c object 2997 if (FDTy->isObjCInterfaceType()) { 2998 Diag(FD->getLocation(), diag::err_statically_allocated_object) 2999 << FD->getDeclName(); 3000 FD->setInvalidDecl(); 3001 EnclosingDecl->setInvalidDecl(); 3002 continue; 3003 } 3004 // Keep track of the number of named members. 3005 if (IdentifierInfo *II = FD->getIdentifier()) { 3006 // Detect duplicate member names. 3007 if (!FieldIDs.insert(II)) { 3008 Diag(FD->getLocation(), diag::err_duplicate_member) << II; 3009 // Find the previous decl. 3010 SourceLocation PrevLoc; 3011 for (unsigned i = 0; ; ++i) { 3012 assert(i != RecFields.size() && "Didn't find previous def!"); 3013 if (RecFields[i]->getIdentifier() == II) { 3014 PrevLoc = RecFields[i]->getLocation(); 3015 break; 3016 } 3017 } 3018 Diag(PrevLoc, diag::note_previous_definition); 3019 FD->setInvalidDecl(); 3020 EnclosingDecl->setInvalidDecl(); 3021 continue; 3022 } 3023 ++NumNamedMembers; 3024 } 3025 } 3026 3027 // Okay, we successfully defined 'Record'. 3028 if (Record) { 3029 Record->completeDefinition(Context); 3030 // If this is a C++ record, HandleTagDeclDefinition will be invoked in 3031 // Sema::ActOnFinishCXXClassDef. 3032 if (!isa<CXXRecordDecl>(Record)) 3033 Consumer.HandleTagDeclDefinition(Record); 3034 } else { 3035 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 3036 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 3037 ID->addInstanceVariablesToClass(ClsFields, RecFields.size(), RBrac); 3038 // Must enforce the rule that ivars in the base classes may not be 3039 // duplicates. 3040 if (ID->getSuperClass()) { 3041 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 3042 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 3043 ObjCIvarDecl* Ivar = (*IVI); 3044 IdentifierInfo *II = Ivar->getIdentifier(); 3045 ObjCIvarDecl* prevIvar = ID->getSuperClass()->FindIvarDeclaration(II); 3046 if (prevIvar) { 3047 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 3048 Diag(prevIvar->getLocation(), diag::note_previous_definition); 3049 } 3050 } 3051 } 3052 } 3053 else if (ObjCImplementationDecl *IMPDecl = 3054 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 3055 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 3056 IMPDecl->ObjCAddInstanceVariablesToClassImpl(ClsFields, RecFields.size()); 3057 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 3058 } 3059 } 3060 3061 if (Attr) 3062 ProcessDeclAttributeList(Record, Attr); 3063} 3064 3065Sema::DeclTy *Sema::ActOnEnumConstant(Scope *S, DeclTy *theEnumDecl, 3066 DeclTy *lastEnumConst, 3067 SourceLocation IdLoc, IdentifierInfo *Id, 3068 SourceLocation EqualLoc, ExprTy *val) { 3069 EnumDecl *TheEnumDecl = cast<EnumDecl>(static_cast<Decl*>(theEnumDecl)); 3070 EnumConstantDecl *LastEnumConst = 3071 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(lastEnumConst)); 3072 Expr *Val = static_cast<Expr*>(val); 3073 3074 // The scope passed in may not be a decl scope. Zip up the scope tree until 3075 // we find one that is. 3076 while ((S->getFlags() & Scope::DeclScope) == 0) 3077 S = S->getParent(); 3078 3079 // Verify that there isn't already something declared with this name in this 3080 // scope. 3081 Decl *PrevDecl = LookupDecl(Id, Decl::IDNS_Ordinary, S); 3082 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3083 // Maybe we will complain about the shadowed template parameter. 3084 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 3085 // Just pretend that we didn't see the previous declaration. 3086 PrevDecl = 0; 3087 } 3088 3089 if (PrevDecl) { 3090 // When in C++, we may get a TagDecl with the same name; in this case the 3091 // enum constant will 'hide' the tag. 3092 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 3093 "Received TagDecl when not in C++!"); 3094 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 3095 if (isa<EnumConstantDecl>(PrevDecl)) 3096 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 3097 else 3098 Diag(IdLoc, diag::err_redefinition) << Id; 3099 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3100 delete Val; 3101 return 0; 3102 } 3103 } 3104 3105 llvm::APSInt EnumVal(32); 3106 QualType EltTy; 3107 if (Val) { 3108 // Make sure to promote the operand type to int. 3109 UsualUnaryConversions(Val); 3110 3111 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 3112 SourceLocation ExpLoc; 3113 if (VerifyIntegerConstantExpression(Val, &EnumVal)) { 3114 delete Val; 3115 Val = 0; // Just forget about it. 3116 } else { 3117 EltTy = Val->getType(); 3118 } 3119 } 3120 3121 if (!Val) { 3122 if (LastEnumConst) { 3123 // Assign the last value + 1. 3124 EnumVal = LastEnumConst->getInitVal(); 3125 ++EnumVal; 3126 3127 // Check for overflow on increment. 3128 if (EnumVal < LastEnumConst->getInitVal()) 3129 Diag(IdLoc, diag::warn_enum_value_overflow); 3130 3131 EltTy = LastEnumConst->getType(); 3132 } else { 3133 // First value, set to zero. 3134 EltTy = Context.IntTy; 3135 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 3136 } 3137 } 3138 3139 EnumConstantDecl *New = 3140 EnumConstantDecl::Create(Context, TheEnumDecl, IdLoc, Id, EltTy, 3141 Val, EnumVal, 3142 LastEnumConst); 3143 3144 // Register this decl in the current scope stack. 3145 PushOnScopeChains(New, S); 3146 3147 // Add this enumerator into the enum itself. 3148 // FIXME: This means that the enumerator is stored in two 3149 // DeclContexts. This is not a long-term solution. 3150 New->setLexicalDeclContext(TheEnumDecl); 3151 TheEnumDecl->addDecl(Context, New, true); 3152 return New; 3153} 3154 3155// FIXME: For consistency with ActOnFields(), we should have the parser 3156// pass in the source location for the left/right braces. 3157void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclTy *EnumDeclX, 3158 DeclTy **Elements, unsigned NumElements) { 3159 EnumDecl *Enum = cast<EnumDecl>(static_cast<Decl*>(EnumDeclX)); 3160 3161 if (Enum) { 3162 if (EnumDecl *Def = cast_or_null<EnumDecl>(Enum->getDefinition(Context))) { 3163 // Diagnose code like: 3164 // enum e0 { 3165 // E0 = sizeof(enum e0 { E1 }) 3166 // }; 3167 Diag(Def->getLocation(), diag::err_nested_redefinition) 3168 << Enum->getDeclName(); 3169 Diag(Enum->getLocation(), diag::note_previous_definition); 3170 Enum->setInvalidDecl(); 3171 return; 3172 } 3173 } 3174 // TODO: If the result value doesn't fit in an int, it must be a long or long 3175 // long value. ISO C does not support this, but GCC does as an extension, 3176 // emit a warning. 3177 unsigned IntWidth = Context.Target.getIntWidth(); 3178 3179 // Verify that all the values are okay, compute the size of the values, and 3180 // reverse the list. 3181 unsigned NumNegativeBits = 0; 3182 unsigned NumPositiveBits = 0; 3183 3184 // Keep track of whether all elements have type int. 3185 bool AllElementsInt = true; 3186 3187 QualType EnumType = Context.getTypeDeclType(Enum); 3188 EnumConstantDecl *EltList = 0; 3189 for (unsigned i = 0; i != NumElements; ++i) { 3190 EnumConstantDecl *ECD = 3191 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3192 if (!ECD) continue; // Already issued a diagnostic. 3193 3194 // If the enum value doesn't fit in an int, emit an extension warning. 3195 const llvm::APSInt &InitVal = ECD->getInitVal(); 3196 assert(InitVal.getBitWidth() >= IntWidth && 3197 "Should have promoted value to int"); 3198 if (InitVal.getBitWidth() > IntWidth) { 3199 llvm::APSInt V(InitVal); 3200 V.trunc(IntWidth); 3201 V.extend(InitVal.getBitWidth()); 3202 if (V != InitVal) 3203 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 3204 << InitVal.toString(10); 3205 } 3206 3207 // Keep track of the size of positive and negative values. 3208 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 3209 NumPositiveBits = std::max(NumPositiveBits, 3210 (unsigned)InitVal.getActiveBits()); 3211 else 3212 NumNegativeBits = std::max(NumNegativeBits, 3213 (unsigned)InitVal.getMinSignedBits()); 3214 3215 // Keep track of whether every enum element has type int (very commmon). 3216 if (AllElementsInt) 3217 AllElementsInt = ECD->getType() == Context.IntTy; 3218 3219 ECD->setNextDeclarator(EltList); 3220 EltList = ECD; 3221 } 3222 3223 // Figure out the type that should be used for this enum. 3224 // FIXME: Support attribute(packed) on enums and -fshort-enums. 3225 QualType BestType; 3226 unsigned BestWidth; 3227 3228 if (NumNegativeBits) { 3229 // If there is a negative value, figure out the smallest integer type (of 3230 // int/long/longlong) that fits. 3231 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 3232 BestType = Context.IntTy; 3233 BestWidth = IntWidth; 3234 } else { 3235 BestWidth = Context.Target.getLongWidth(); 3236 3237 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 3238 BestType = Context.LongTy; 3239 else { 3240 BestWidth = Context.Target.getLongLongWidth(); 3241 3242 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 3243 Diag(Enum->getLocation(), diag::warn_enum_too_large); 3244 BestType = Context.LongLongTy; 3245 } 3246 } 3247 } else { 3248 // If there is no negative value, figure out which of uint, ulong, ulonglong 3249 // fits. 3250 if (NumPositiveBits <= IntWidth) { 3251 BestType = Context.UnsignedIntTy; 3252 BestWidth = IntWidth; 3253 } else if (NumPositiveBits <= 3254 (BestWidth = Context.Target.getLongWidth())) { 3255 BestType = Context.UnsignedLongTy; 3256 } else { 3257 BestWidth = Context.Target.getLongLongWidth(); 3258 assert(NumPositiveBits <= BestWidth && 3259 "How could an initializer get larger than ULL?"); 3260 BestType = Context.UnsignedLongLongTy; 3261 } 3262 } 3263 3264 // Loop over all of the enumerator constants, changing their types to match 3265 // the type of the enum if needed. 3266 for (unsigned i = 0; i != NumElements; ++i) { 3267 EnumConstantDecl *ECD = 3268 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3269 if (!ECD) continue; // Already issued a diagnostic. 3270 3271 // Standard C says the enumerators have int type, but we allow, as an 3272 // extension, the enumerators to be larger than int size. If each 3273 // enumerator value fits in an int, type it as an int, otherwise type it the 3274 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 3275 // that X has type 'int', not 'unsigned'. 3276 if (ECD->getType() == Context.IntTy) { 3277 // Make sure the init value is signed. 3278 llvm::APSInt IV = ECD->getInitVal(); 3279 IV.setIsSigned(true); 3280 ECD->setInitVal(IV); 3281 3282 if (getLangOptions().CPlusPlus) 3283 // C++ [dcl.enum]p4: Following the closing brace of an 3284 // enum-specifier, each enumerator has the type of its 3285 // enumeration. 3286 ECD->setType(EnumType); 3287 continue; // Already int type. 3288 } 3289 3290 // Determine whether the value fits into an int. 3291 llvm::APSInt InitVal = ECD->getInitVal(); 3292 bool FitsInInt; 3293 if (InitVal.isUnsigned() || !InitVal.isNegative()) 3294 FitsInInt = InitVal.getActiveBits() < IntWidth; 3295 else 3296 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 3297 3298 // If it fits into an integer type, force it. Otherwise force it to match 3299 // the enum decl type. 3300 QualType NewTy; 3301 unsigned NewWidth; 3302 bool NewSign; 3303 if (FitsInInt) { 3304 NewTy = Context.IntTy; 3305 NewWidth = IntWidth; 3306 NewSign = true; 3307 } else if (ECD->getType() == BestType) { 3308 // Already the right type! 3309 if (getLangOptions().CPlusPlus) 3310 // C++ [dcl.enum]p4: Following the closing brace of an 3311 // enum-specifier, each enumerator has the type of its 3312 // enumeration. 3313 ECD->setType(EnumType); 3314 continue; 3315 } else { 3316 NewTy = BestType; 3317 NewWidth = BestWidth; 3318 NewSign = BestType->isSignedIntegerType(); 3319 } 3320 3321 // Adjust the APSInt value. 3322 InitVal.extOrTrunc(NewWidth); 3323 InitVal.setIsSigned(NewSign); 3324 ECD->setInitVal(InitVal); 3325 3326 // Adjust the Expr initializer and type. 3327 ECD->setInitExpr(new ImplicitCastExpr(NewTy, ECD->getInitExpr(), 3328 /*isLvalue=*/false)); 3329 if (getLangOptions().CPlusPlus) 3330 // C++ [dcl.enum]p4: Following the closing brace of an 3331 // enum-specifier, each enumerator has the type of its 3332 // enumeration. 3333 ECD->setType(EnumType); 3334 else 3335 ECD->setType(NewTy); 3336 } 3337 3338 Enum->completeDefinition(Context, BestType); 3339 Consumer.HandleTagDeclDefinition(Enum); 3340} 3341 3342Sema::DeclTy *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 3343 ExprArg expr) { 3344 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr.release()); 3345 3346 return FileScopeAsmDecl::Create(Context, Loc, AsmString); 3347} 3348 3349 3350void Sema::ActOnPragmaPack(PragmaPackKind Kind, IdentifierInfo *Name, 3351 ExprTy *alignment, SourceLocation PragmaLoc, 3352 SourceLocation LParenLoc, SourceLocation RParenLoc) { 3353 Expr *Alignment = static_cast<Expr *>(alignment); 3354 3355 // If specified then alignment must be a "small" power of two. 3356 unsigned AlignmentVal = 0; 3357 if (Alignment) { 3358 llvm::APSInt Val; 3359 if (!Alignment->isIntegerConstantExpr(Val, Context) || 3360 !Val.isPowerOf2() || 3361 Val.getZExtValue() > 16) { 3362 Diag(PragmaLoc, diag::warn_pragma_pack_invalid_alignment); 3363 delete Alignment; 3364 return; // Ignore 3365 } 3366 3367 AlignmentVal = (unsigned) Val.getZExtValue(); 3368 } 3369 3370 switch (Kind) { 3371 case Action::PPK_Default: // pack([n]) 3372 PackContext.setAlignment(AlignmentVal); 3373 break; 3374 3375 case Action::PPK_Show: // pack(show) 3376 // Show the current alignment, making sure to show the right value 3377 // for the default. 3378 AlignmentVal = PackContext.getAlignment(); 3379 // FIXME: This should come from the target. 3380 if (AlignmentVal == 0) 3381 AlignmentVal = 8; 3382 Diag(PragmaLoc, diag::warn_pragma_pack_show) << AlignmentVal; 3383 break; 3384 3385 case Action::PPK_Push: // pack(push [, id] [, [n]) 3386 PackContext.push(Name); 3387 // Set the new alignment if specified. 3388 if (Alignment) 3389 PackContext.setAlignment(AlignmentVal); 3390 break; 3391 3392 case Action::PPK_Pop: // pack(pop [, id] [, n]) 3393 // MSDN, C/C++ Preprocessor Reference > Pragma Directives > pack: 3394 // "#pragma pack(pop, identifier, n) is undefined" 3395 if (Alignment && Name) 3396 Diag(PragmaLoc, diag::warn_pragma_pack_pop_identifer_and_alignment); 3397 3398 // Do the pop. 3399 if (!PackContext.pop(Name)) { 3400 // If a name was specified then failure indicates the name 3401 // wasn't found. Otherwise failure indicates the stack was 3402 // empty. 3403 Diag(PragmaLoc, diag::warn_pragma_pack_pop_failed) 3404 << (Name ? "no record matching name" : "stack empty"); 3405 3406 // FIXME: Warn about popping named records as MSVC does. 3407 } else { 3408 // Pop succeeded, set the new alignment if specified. 3409 if (Alignment) 3410 PackContext.setAlignment(AlignmentVal); 3411 } 3412 break; 3413 3414 default: 3415 assert(0 && "Invalid #pragma pack kind."); 3416 } 3417} 3418 3419bool PragmaPackStack::pop(IdentifierInfo *Name) { 3420 if (Stack.empty()) 3421 return false; 3422 3423 // If name is empty just pop top. 3424 if (!Name) { 3425 Alignment = Stack.back().first; 3426 Stack.pop_back(); 3427 return true; 3428 } 3429 3430 // Otherwise, find the named record. 3431 for (unsigned i = Stack.size(); i != 0; ) { 3432 --i; 3433 if (Stack[i].second == Name) { 3434 // Found it, pop up to and including this record. 3435 Alignment = Stack[i].first; 3436 Stack.erase(Stack.begin() + i, Stack.end()); 3437 return true; 3438 } 3439 } 3440 3441 return false; 3442} 3443