SemaDeclCXX.cpp revision 7d384dd5ace9ae9a22a69e700d2cacb256bc6c69
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ 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 C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "Lookup.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/CXXInheritance.h" 19#include "clang/AST/DeclVisitor.h" 20#include "clang/AST/TypeOrdering.h" 21#include "clang/AST/StmtVisitor.h" 22#include "clang/Parse/DeclSpec.h" 23#include "clang/Parse/Template.h" 24#include "clang/Basic/PartialDiagnostic.h" 25#include "clang/Lex/Preprocessor.h" 26#include "llvm/ADT/STLExtras.h" 27#include "llvm/Support/Compiler.h" 28#include <algorithm> // for std::equal 29#include <map> 30#include <set> 31 32using namespace clang; 33 34//===----------------------------------------------------------------------===// 35// CheckDefaultArgumentVisitor 36//===----------------------------------------------------------------------===// 37 38namespace { 39 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 40 /// the default argument of a parameter to determine whether it 41 /// contains any ill-formed subexpressions. For example, this will 42 /// diagnose the use of local variables or parameters within the 43 /// default argument expression. 44 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 45 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 46 Expr *DefaultArg; 47 Sema *S; 48 49 public: 50 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 51 : DefaultArg(defarg), S(s) {} 52 53 bool VisitExpr(Expr *Node); 54 bool VisitDeclRefExpr(DeclRefExpr *DRE); 55 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 56 }; 57 58 /// VisitExpr - Visit all of the children of this expression. 59 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 60 bool IsInvalid = false; 61 for (Stmt::child_iterator I = Node->child_begin(), 62 E = Node->child_end(); I != E; ++I) 63 IsInvalid |= Visit(*I); 64 return IsInvalid; 65 } 66 67 /// VisitDeclRefExpr - Visit a reference to a declaration, to 68 /// determine whether this declaration can be used in the default 69 /// argument expression. 70 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 71 NamedDecl *Decl = DRE->getDecl(); 72 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 73 // C++ [dcl.fct.default]p9 74 // Default arguments are evaluated each time the function is 75 // called. The order of evaluation of function arguments is 76 // unspecified. Consequently, parameters of a function shall not 77 // be used in default argument expressions, even if they are not 78 // evaluated. Parameters of a function declared before a default 79 // argument expression are in scope and can hide namespace and 80 // class member names. 81 return S->Diag(DRE->getSourceRange().getBegin(), 82 diag::err_param_default_argument_references_param) 83 << Param->getDeclName() << DefaultArg->getSourceRange(); 84 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 85 // C++ [dcl.fct.default]p7 86 // Local variables shall not be used in default argument 87 // expressions. 88 if (VDecl->isBlockVarDecl()) 89 return S->Diag(DRE->getSourceRange().getBegin(), 90 diag::err_param_default_argument_references_local) 91 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 92 } 93 94 return false; 95 } 96 97 /// VisitCXXThisExpr - Visit a C++ "this" expression. 98 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 99 // C++ [dcl.fct.default]p8: 100 // The keyword this shall not be used in a default argument of a 101 // member function. 102 return S->Diag(ThisE->getSourceRange().getBegin(), 103 diag::err_param_default_argument_references_this) 104 << ThisE->getSourceRange(); 105 } 106} 107 108bool 109Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 110 SourceLocation EqualLoc) { 111 QualType ParamType = Param->getType(); 112 113 if (RequireCompleteType(Param->getLocation(), Param->getType(), 114 diag::err_typecheck_decl_incomplete_type)) { 115 Param->setInvalidDecl(); 116 return true; 117 } 118 119 Expr *Arg = (Expr *)DefaultArg.get(); 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 if (CheckInitializerTypes(Arg, ParamType, EqualLoc, 128 Param->getDeclName(), /*DirectInit=*/false)) 129 return true; 130 131 Arg = MaybeCreateCXXExprWithTemporaries(Arg, /*DestroyTemps=*/false); 132 133 // Okay: add the default argument to the parameter 134 Param->setDefaultArg(Arg); 135 136 DefaultArg.release(); 137 138 return false; 139} 140 141/// ActOnParamDefaultArgument - Check whether the default argument 142/// provided for a function parameter is well-formed. If so, attach it 143/// to the parameter declaration. 144void 145Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 146 ExprArg defarg) { 147 if (!param || !defarg.get()) 148 return; 149 150 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 151 UnparsedDefaultArgLocs.erase(Param); 152 153 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 154 QualType ParamType = Param->getType(); 155 156 // Default arguments are only permitted in C++ 157 if (!getLangOptions().CPlusPlus) { 158 Diag(EqualLoc, diag::err_param_default_argument) 159 << DefaultArg->getSourceRange(); 160 Param->setInvalidDecl(); 161 return; 162 } 163 164 // Check that the default argument is well-formed 165 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 166 if (DefaultArgChecker.Visit(DefaultArg.get())) { 167 Param->setInvalidDecl(); 168 return; 169 } 170 171 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 172} 173 174/// ActOnParamUnparsedDefaultArgument - We've seen a default 175/// argument for a function parameter, but we can't parse it yet 176/// because we're inside a class definition. Note that this default 177/// argument will be parsed later. 178void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 179 SourceLocation EqualLoc, 180 SourceLocation ArgLoc) { 181 if (!param) 182 return; 183 184 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 185 if (Param) 186 Param->setUnparsedDefaultArg(); 187 188 UnparsedDefaultArgLocs[Param] = ArgLoc; 189} 190 191/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 192/// the default argument for the parameter param failed. 193void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 194 if (!param) 195 return; 196 197 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 198 199 Param->setInvalidDecl(); 200 201 UnparsedDefaultArgLocs.erase(Param); 202} 203 204/// CheckExtraCXXDefaultArguments - Check for any extra default 205/// arguments in the declarator, which is not a function declaration 206/// or definition and therefore is not permitted to have default 207/// arguments. This routine should be invoked for every declarator 208/// that is not a function declaration or definition. 209void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 210 // C++ [dcl.fct.default]p3 211 // A default argument expression shall be specified only in the 212 // parameter-declaration-clause of a function declaration or in a 213 // template-parameter (14.1). It shall not be specified for a 214 // parameter pack. If it is specified in a 215 // parameter-declaration-clause, it shall not occur within a 216 // declarator or abstract-declarator of a parameter-declaration. 217 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 218 DeclaratorChunk &chunk = D.getTypeObject(i); 219 if (chunk.Kind == DeclaratorChunk::Function) { 220 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 221 ParmVarDecl *Param = 222 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 223 if (Param->hasUnparsedDefaultArg()) { 224 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 225 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 226 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 227 delete Toks; 228 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 229 } else if (Param->getDefaultArg()) { 230 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 231 << Param->getDefaultArg()->getSourceRange(); 232 Param->setDefaultArg(0); 233 } 234 } 235 } 236 } 237} 238 239// MergeCXXFunctionDecl - Merge two declarations of the same C++ 240// function, once we already know that they have the same 241// type. Subroutine of MergeFunctionDecl. Returns true if there was an 242// error, false otherwise. 243bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 244 bool Invalid = false; 245 246 // C++ [dcl.fct.default]p4: 247 // For non-template functions, default arguments can be added in 248 // later declarations of a function in the same 249 // scope. Declarations in different scopes have completely 250 // distinct sets of default arguments. That is, declarations in 251 // inner scopes do not acquire default arguments from 252 // declarations in outer scopes, and vice versa. In a given 253 // function declaration, all parameters subsequent to a 254 // parameter with a default argument shall have default 255 // arguments supplied in this or previous declarations. A 256 // default argument shall not be redefined by a later 257 // declaration (not even to the same value). 258 // 259 // C++ [dcl.fct.default]p6: 260 // Except for member functions of class templates, the default arguments 261 // in a member function definition that appears outside of the class 262 // definition are added to the set of default arguments provided by the 263 // member function declaration in the class definition. 264 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 265 ParmVarDecl *OldParam = Old->getParamDecl(p); 266 ParmVarDecl *NewParam = New->getParamDecl(p); 267 268 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 269 // FIXME: If the parameter doesn't have an identifier then the location 270 // points to the '=' which means that the fixit hint won't remove any 271 // extra spaces between the type and the '='. 272 SourceLocation Begin = NewParam->getLocation(); 273 if (NewParam->getIdentifier()) 274 Begin = PP.getLocForEndOfToken(Begin); 275 276 Diag(NewParam->getLocation(), 277 diag::err_param_default_argument_redefinition) 278 << NewParam->getDefaultArgRange() 279 << CodeModificationHint::CreateRemoval(SourceRange(Begin, 280 NewParam->getLocEnd())); 281 282 // Look for the function declaration where the default argument was 283 // actually written, which may be a declaration prior to Old. 284 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 285 Older; Older = Older->getPreviousDeclaration()) { 286 if (!Older->getParamDecl(p)->hasDefaultArg()) 287 break; 288 289 OldParam = Older->getParamDecl(p); 290 } 291 292 Diag(OldParam->getLocation(), diag::note_previous_definition) 293 << OldParam->getDefaultArgRange(); 294 Invalid = true; 295 } else if (OldParam->hasDefaultArg()) { 296 // Merge the old default argument into the new parameter 297 if (OldParam->hasUninstantiatedDefaultArg()) 298 NewParam->setUninstantiatedDefaultArg( 299 OldParam->getUninstantiatedDefaultArg()); 300 else 301 NewParam->setDefaultArg(OldParam->getDefaultArg()); 302 } else if (NewParam->hasDefaultArg()) { 303 if (New->getDescribedFunctionTemplate()) { 304 // Paragraph 4, quoted above, only applies to non-template functions. 305 Diag(NewParam->getLocation(), 306 diag::err_param_default_argument_template_redecl) 307 << NewParam->getDefaultArgRange(); 308 Diag(Old->getLocation(), diag::note_template_prev_declaration) 309 << false; 310 } else if (New->getTemplateSpecializationKind() 311 != TSK_ImplicitInstantiation && 312 New->getTemplateSpecializationKind() != TSK_Undeclared) { 313 // C++ [temp.expr.spec]p21: 314 // Default function arguments shall not be specified in a declaration 315 // or a definition for one of the following explicit specializations: 316 // - the explicit specialization of a function template; 317 // - the explicit specialization of a member function template; 318 // - the explicit specialization of a member function of a class 319 // template where the class template specialization to which the 320 // member function specialization belongs is implicitly 321 // instantiated. 322 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 323 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 324 << New->getDeclName() 325 << NewParam->getDefaultArgRange(); 326 } else if (New->getDeclContext()->isDependentContext()) { 327 // C++ [dcl.fct.default]p6 (DR217): 328 // Default arguments for a member function of a class template shall 329 // be specified on the initial declaration of the member function 330 // within the class template. 331 // 332 // Reading the tea leaves a bit in DR217 and its reference to DR205 333 // leads me to the conclusion that one cannot add default function 334 // arguments for an out-of-line definition of a member function of a 335 // dependent type. 336 int WhichKind = 2; 337 if (CXXRecordDecl *Record 338 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 339 if (Record->getDescribedClassTemplate()) 340 WhichKind = 0; 341 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 342 WhichKind = 1; 343 else 344 WhichKind = 2; 345 } 346 347 Diag(NewParam->getLocation(), 348 diag::err_param_default_argument_member_template_redecl) 349 << WhichKind 350 << NewParam->getDefaultArgRange(); 351 } 352 } 353 } 354 355 if (CheckEquivalentExceptionSpec( 356 Old->getType()->getAs<FunctionProtoType>(), Old->getLocation(), 357 New->getType()->getAs<FunctionProtoType>(), New->getLocation())) { 358 Invalid = true; 359 } 360 361 return Invalid; 362} 363 364/// CheckCXXDefaultArguments - Verify that the default arguments for a 365/// function declaration are well-formed according to C++ 366/// [dcl.fct.default]. 367void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 368 unsigned NumParams = FD->getNumParams(); 369 unsigned p; 370 371 // Find first parameter with a default argument 372 for (p = 0; p < NumParams; ++p) { 373 ParmVarDecl *Param = FD->getParamDecl(p); 374 if (Param->hasDefaultArg()) 375 break; 376 } 377 378 // C++ [dcl.fct.default]p4: 379 // In a given function declaration, all parameters 380 // subsequent to a parameter with a default argument shall 381 // have default arguments supplied in this or previous 382 // declarations. A default argument shall not be redefined 383 // by a later declaration (not even to the same value). 384 unsigned LastMissingDefaultArg = 0; 385 for (; p < NumParams; ++p) { 386 ParmVarDecl *Param = FD->getParamDecl(p); 387 if (!Param->hasDefaultArg()) { 388 if (Param->isInvalidDecl()) 389 /* We already complained about this parameter. */; 390 else if (Param->getIdentifier()) 391 Diag(Param->getLocation(), 392 diag::err_param_default_argument_missing_name) 393 << Param->getIdentifier(); 394 else 395 Diag(Param->getLocation(), 396 diag::err_param_default_argument_missing); 397 398 LastMissingDefaultArg = p; 399 } 400 } 401 402 if (LastMissingDefaultArg > 0) { 403 // Some default arguments were missing. Clear out all of the 404 // default arguments up to (and including) the last missing 405 // default argument, so that we leave the function parameters 406 // in a semantically valid state. 407 for (p = 0; p <= LastMissingDefaultArg; ++p) { 408 ParmVarDecl *Param = FD->getParamDecl(p); 409 if (Param->hasDefaultArg()) { 410 if (!Param->hasUnparsedDefaultArg()) 411 Param->getDefaultArg()->Destroy(Context); 412 Param->setDefaultArg(0); 413 } 414 } 415 } 416} 417 418/// isCurrentClassName - Determine whether the identifier II is the 419/// name of the class type currently being defined. In the case of 420/// nested classes, this will only return true if II is the name of 421/// the innermost class. 422bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 423 const CXXScopeSpec *SS) { 424 CXXRecordDecl *CurDecl; 425 if (SS && SS->isSet() && !SS->isInvalid()) { 426 DeclContext *DC = computeDeclContext(*SS, true); 427 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 428 } else 429 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 430 431 if (CurDecl) 432 return &II == CurDecl->getIdentifier(); 433 else 434 return false; 435} 436 437/// \brief Check the validity of a C++ base class specifier. 438/// 439/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 440/// and returns NULL otherwise. 441CXXBaseSpecifier * 442Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 443 SourceRange SpecifierRange, 444 bool Virtual, AccessSpecifier Access, 445 QualType BaseType, 446 SourceLocation BaseLoc) { 447 // C++ [class.union]p1: 448 // A union shall not have base classes. 449 if (Class->isUnion()) { 450 Diag(Class->getLocation(), diag::err_base_clause_on_union) 451 << SpecifierRange; 452 return 0; 453 } 454 455 if (BaseType->isDependentType()) 456 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 457 Class->getTagKind() == RecordDecl::TK_class, 458 Access, BaseType); 459 460 // Base specifiers must be record types. 461 if (!BaseType->isRecordType()) { 462 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 463 return 0; 464 } 465 466 // C++ [class.union]p1: 467 // A union shall not be used as a base class. 468 if (BaseType->isUnionType()) { 469 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 470 return 0; 471 } 472 473 // C++ [class.derived]p2: 474 // The class-name in a base-specifier shall not be an incompletely 475 // defined class. 476 if (RequireCompleteType(BaseLoc, BaseType, 477 PDiag(diag::err_incomplete_base_class) 478 << SpecifierRange)) 479 return 0; 480 481 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 482 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 483 assert(BaseDecl && "Record type has no declaration"); 484 BaseDecl = BaseDecl->getDefinition(Context); 485 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 486 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 487 assert(CXXBaseDecl && "Base type is not a C++ type"); 488 if (!CXXBaseDecl->isEmpty()) 489 Class->setEmpty(false); 490 if (CXXBaseDecl->isPolymorphic()) 491 Class->setPolymorphic(true); 492 493 // C++ [dcl.init.aggr]p1: 494 // An aggregate is [...] a class with [...] no base classes [...]. 495 Class->setAggregate(false); 496 Class->setPOD(false); 497 498 if (Virtual) { 499 // C++ [class.ctor]p5: 500 // A constructor is trivial if its class has no virtual base classes. 501 Class->setHasTrivialConstructor(false); 502 503 // C++ [class.copy]p6: 504 // A copy constructor is trivial if its class has no virtual base classes. 505 Class->setHasTrivialCopyConstructor(false); 506 507 // C++ [class.copy]p11: 508 // A copy assignment operator is trivial if its class has no virtual 509 // base classes. 510 Class->setHasTrivialCopyAssignment(false); 511 512 // C++0x [meta.unary.prop] is_empty: 513 // T is a class type, but not a union type, with ... no virtual base 514 // classes 515 Class->setEmpty(false); 516 } else { 517 // C++ [class.ctor]p5: 518 // A constructor is trivial if all the direct base classes of its 519 // class have trivial constructors. 520 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialConstructor()) 521 Class->setHasTrivialConstructor(false); 522 523 // C++ [class.copy]p6: 524 // A copy constructor is trivial if all the direct base classes of its 525 // class have trivial copy constructors. 526 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyConstructor()) 527 Class->setHasTrivialCopyConstructor(false); 528 529 // C++ [class.copy]p11: 530 // A copy assignment operator is trivial if all the direct base classes 531 // of its class have trivial copy assignment operators. 532 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyAssignment()) 533 Class->setHasTrivialCopyAssignment(false); 534 } 535 536 // C++ [class.ctor]p3: 537 // A destructor is trivial if all the direct base classes of its class 538 // have trivial destructors. 539 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialDestructor()) 540 Class->setHasTrivialDestructor(false); 541 542 // Create the base specifier. 543 // FIXME: Allocate via ASTContext? 544 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 545 Class->getTagKind() == RecordDecl::TK_class, 546 Access, BaseType); 547} 548 549/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 550/// one entry in the base class list of a class specifier, for 551/// example: 552/// class foo : public bar, virtual private baz { 553/// 'public bar' and 'virtual private baz' are each base-specifiers. 554Sema::BaseResult 555Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 556 bool Virtual, AccessSpecifier Access, 557 TypeTy *basetype, SourceLocation BaseLoc) { 558 if (!classdecl) 559 return true; 560 561 AdjustDeclIfTemplate(classdecl); 562 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 563 QualType BaseType = GetTypeFromParser(basetype); 564 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 565 Virtual, Access, 566 BaseType, BaseLoc)) 567 return BaseSpec; 568 569 return true; 570} 571 572/// \brief Performs the actual work of attaching the given base class 573/// specifiers to a C++ class. 574bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 575 unsigned NumBases) { 576 if (NumBases == 0) 577 return false; 578 579 // Used to keep track of which base types we have already seen, so 580 // that we can properly diagnose redundant direct base types. Note 581 // that the key is always the unqualified canonical type of the base 582 // class. 583 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 584 585 // Copy non-redundant base specifiers into permanent storage. 586 unsigned NumGoodBases = 0; 587 bool Invalid = false; 588 for (unsigned idx = 0; idx < NumBases; ++idx) { 589 QualType NewBaseType 590 = Context.getCanonicalType(Bases[idx]->getType()); 591 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 592 593 if (KnownBaseTypes[NewBaseType]) { 594 // C++ [class.mi]p3: 595 // A class shall not be specified as a direct base class of a 596 // derived class more than once. 597 Diag(Bases[idx]->getSourceRange().getBegin(), 598 diag::err_duplicate_base_class) 599 << KnownBaseTypes[NewBaseType]->getType() 600 << Bases[idx]->getSourceRange(); 601 602 // Delete the duplicate base class specifier; we're going to 603 // overwrite its pointer later. 604 Context.Deallocate(Bases[idx]); 605 606 Invalid = true; 607 } else { 608 // Okay, add this new base class. 609 KnownBaseTypes[NewBaseType] = Bases[idx]; 610 Bases[NumGoodBases++] = Bases[idx]; 611 } 612 } 613 614 // Attach the remaining base class specifiers to the derived class. 615 Class->setBases(Context, Bases, NumGoodBases); 616 617 // Delete the remaining (good) base class specifiers, since their 618 // data has been copied into the CXXRecordDecl. 619 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 620 Context.Deallocate(Bases[idx]); 621 622 return Invalid; 623} 624 625/// ActOnBaseSpecifiers - Attach the given base specifiers to the 626/// class, after checking whether there are any duplicate base 627/// classes. 628void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 629 unsigned NumBases) { 630 if (!ClassDecl || !Bases || !NumBases) 631 return; 632 633 AdjustDeclIfTemplate(ClassDecl); 634 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 635 (CXXBaseSpecifier**)(Bases), NumBases); 636} 637 638/// \brief Determine whether the type \p Derived is a C++ class that is 639/// derived from the type \p Base. 640bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 641 if (!getLangOptions().CPlusPlus) 642 return false; 643 644 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 645 if (!DerivedRT) 646 return false; 647 648 const RecordType *BaseRT = Base->getAs<RecordType>(); 649 if (!BaseRT) 650 return false; 651 652 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 653 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 654 return DerivedRD->isDerivedFrom(BaseRD); 655} 656 657/// \brief Determine whether the type \p Derived is a C++ class that is 658/// derived from the type \p Base. 659bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 660 if (!getLangOptions().CPlusPlus) 661 return false; 662 663 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 664 if (!DerivedRT) 665 return false; 666 667 const RecordType *BaseRT = Base->getAs<RecordType>(); 668 if (!BaseRT) 669 return false; 670 671 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 672 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 673 return DerivedRD->isDerivedFrom(BaseRD, Paths); 674} 675 676/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 677/// conversion (where Derived and Base are class types) is 678/// well-formed, meaning that the conversion is unambiguous (and 679/// that all of the base classes are accessible). Returns true 680/// and emits a diagnostic if the code is ill-formed, returns false 681/// otherwise. Loc is the location where this routine should point to 682/// if there is an error, and Range is the source range to highlight 683/// if there is an error. 684bool 685Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 686 unsigned InaccessibleBaseID, 687 unsigned AmbigiousBaseConvID, 688 SourceLocation Loc, SourceRange Range, 689 DeclarationName Name) { 690 // First, determine whether the path from Derived to Base is 691 // ambiguous. This is slightly more expensive than checking whether 692 // the Derived to Base conversion exists, because here we need to 693 // explore multiple paths to determine if there is an ambiguity. 694 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 695 /*DetectVirtual=*/false); 696 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 697 assert(DerivationOkay && 698 "Can only be used with a derived-to-base conversion"); 699 (void)DerivationOkay; 700 701 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 702 if (InaccessibleBaseID == 0) 703 return false; 704 // Check that the base class can be accessed. 705 return CheckBaseClassAccess(Derived, Base, InaccessibleBaseID, Paths, Loc, 706 Name); 707 } 708 709 // We know that the derived-to-base conversion is ambiguous, and 710 // we're going to produce a diagnostic. Perform the derived-to-base 711 // search just one more time to compute all of the possible paths so 712 // that we can print them out. This is more expensive than any of 713 // the previous derived-to-base checks we've done, but at this point 714 // performance isn't as much of an issue. 715 Paths.clear(); 716 Paths.setRecordingPaths(true); 717 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 718 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 719 (void)StillOkay; 720 721 // Build up a textual representation of the ambiguous paths, e.g., 722 // D -> B -> A, that will be used to illustrate the ambiguous 723 // conversions in the diagnostic. We only print one of the paths 724 // to each base class subobject. 725 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 726 727 Diag(Loc, AmbigiousBaseConvID) 728 << Derived << Base << PathDisplayStr << Range << Name; 729 return true; 730} 731 732bool 733Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 734 SourceLocation Loc, SourceRange Range, 735 bool IgnoreAccess) { 736 return CheckDerivedToBaseConversion(Derived, Base, 737 IgnoreAccess ? 0 : 738 diag::err_conv_to_inaccessible_base, 739 diag::err_ambiguous_derived_to_base_conv, 740 Loc, Range, DeclarationName()); 741} 742 743 744/// @brief Builds a string representing ambiguous paths from a 745/// specific derived class to different subobjects of the same base 746/// class. 747/// 748/// This function builds a string that can be used in error messages 749/// to show the different paths that one can take through the 750/// inheritance hierarchy to go from the derived class to different 751/// subobjects of a base class. The result looks something like this: 752/// @code 753/// struct D -> struct B -> struct A 754/// struct D -> struct C -> struct A 755/// @endcode 756std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 757 std::string PathDisplayStr; 758 std::set<unsigned> DisplayedPaths; 759 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 760 Path != Paths.end(); ++Path) { 761 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 762 // We haven't displayed a path to this particular base 763 // class subobject yet. 764 PathDisplayStr += "\n "; 765 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 766 for (CXXBasePath::const_iterator Element = Path->begin(); 767 Element != Path->end(); ++Element) 768 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 769 } 770 } 771 772 return PathDisplayStr; 773} 774 775//===----------------------------------------------------------------------===// 776// C++ class member Handling 777//===----------------------------------------------------------------------===// 778 779/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 780/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 781/// bitfield width if there is one and 'InitExpr' specifies the initializer if 782/// any. 783Sema::DeclPtrTy 784Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 785 MultiTemplateParamsArg TemplateParameterLists, 786 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 787 const DeclSpec &DS = D.getDeclSpec(); 788 DeclarationName Name = GetNameForDeclarator(D); 789 Expr *BitWidth = static_cast<Expr*>(BW); 790 Expr *Init = static_cast<Expr*>(InitExpr); 791 SourceLocation Loc = D.getIdentifierLoc(); 792 793 bool isFunc = D.isFunctionDeclarator(); 794 795 assert(!DS.isFriendSpecified()); 796 797 // C++ 9.2p6: A member shall not be declared to have automatic storage 798 // duration (auto, register) or with the extern storage-class-specifier. 799 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 800 // data members and cannot be applied to names declared const or static, 801 // and cannot be applied to reference members. 802 switch (DS.getStorageClassSpec()) { 803 case DeclSpec::SCS_unspecified: 804 case DeclSpec::SCS_typedef: 805 case DeclSpec::SCS_static: 806 // FALL THROUGH. 807 break; 808 case DeclSpec::SCS_mutable: 809 if (isFunc) { 810 if (DS.getStorageClassSpecLoc().isValid()) 811 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 812 else 813 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 814 815 // FIXME: It would be nicer if the keyword was ignored only for this 816 // declarator. Otherwise we could get follow-up errors. 817 D.getMutableDeclSpec().ClearStorageClassSpecs(); 818 } else { 819 QualType T = GetTypeForDeclarator(D, S); 820 diag::kind err = static_cast<diag::kind>(0); 821 if (T->isReferenceType()) 822 err = diag::err_mutable_reference; 823 else if (T.isConstQualified()) 824 err = diag::err_mutable_const; 825 if (err != 0) { 826 if (DS.getStorageClassSpecLoc().isValid()) 827 Diag(DS.getStorageClassSpecLoc(), err); 828 else 829 Diag(DS.getThreadSpecLoc(), err); 830 // FIXME: It would be nicer if the keyword was ignored only for this 831 // declarator. Otherwise we could get follow-up errors. 832 D.getMutableDeclSpec().ClearStorageClassSpecs(); 833 } 834 } 835 break; 836 default: 837 if (DS.getStorageClassSpecLoc().isValid()) 838 Diag(DS.getStorageClassSpecLoc(), 839 diag::err_storageclass_invalid_for_member); 840 else 841 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 842 D.getMutableDeclSpec().ClearStorageClassSpecs(); 843 } 844 845 if (!isFunc && 846 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 847 D.getNumTypeObjects() == 0) { 848 // Check also for this case: 849 // 850 // typedef int f(); 851 // f a; 852 // 853 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 854 isFunc = TDType->isFunctionType(); 855 } 856 857 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 858 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 859 !isFunc); 860 861 Decl *Member; 862 if (isInstField) { 863 // FIXME: Check for template parameters! 864 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 865 AS); 866 assert(Member && "HandleField never returns null"); 867 } else { 868 Member = HandleDeclarator(S, D, move(TemplateParameterLists), false) 869 .getAs<Decl>(); 870 if (!Member) { 871 if (BitWidth) DeleteExpr(BitWidth); 872 return DeclPtrTy(); 873 } 874 875 // Non-instance-fields can't have a bitfield. 876 if (BitWidth) { 877 if (Member->isInvalidDecl()) { 878 // don't emit another diagnostic. 879 } else if (isa<VarDecl>(Member)) { 880 // C++ 9.6p3: A bit-field shall not be a static member. 881 // "static member 'A' cannot be a bit-field" 882 Diag(Loc, diag::err_static_not_bitfield) 883 << Name << BitWidth->getSourceRange(); 884 } else if (isa<TypedefDecl>(Member)) { 885 // "typedef member 'x' cannot be a bit-field" 886 Diag(Loc, diag::err_typedef_not_bitfield) 887 << Name << BitWidth->getSourceRange(); 888 } else { 889 // A function typedef ("typedef int f(); f a;"). 890 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 891 Diag(Loc, diag::err_not_integral_type_bitfield) 892 << Name << cast<ValueDecl>(Member)->getType() 893 << BitWidth->getSourceRange(); 894 } 895 896 DeleteExpr(BitWidth); 897 BitWidth = 0; 898 Member->setInvalidDecl(); 899 } 900 901 Member->setAccess(AS); 902 903 // If we have declared a member function template, set the access of the 904 // templated declaration as well. 905 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 906 FunTmpl->getTemplatedDecl()->setAccess(AS); 907 } 908 909 assert((Name || isInstField) && "No identifier for non-field ?"); 910 911 if (Init) 912 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 913 if (Deleted) // FIXME: Source location is not very good. 914 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 915 916 if (isInstField) { 917 FieldCollector->Add(cast<FieldDecl>(Member)); 918 return DeclPtrTy(); 919 } 920 return DeclPtrTy::make(Member); 921} 922 923/// ActOnMemInitializer - Handle a C++ member initializer. 924Sema::MemInitResult 925Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 926 Scope *S, 927 const CXXScopeSpec &SS, 928 IdentifierInfo *MemberOrBase, 929 TypeTy *TemplateTypeTy, 930 SourceLocation IdLoc, 931 SourceLocation LParenLoc, 932 ExprTy **Args, unsigned NumArgs, 933 SourceLocation *CommaLocs, 934 SourceLocation RParenLoc) { 935 if (!ConstructorD) 936 return true; 937 938 AdjustDeclIfTemplate(ConstructorD); 939 940 CXXConstructorDecl *Constructor 941 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 942 if (!Constructor) { 943 // The user wrote a constructor initializer on a function that is 944 // not a C++ constructor. Ignore the error for now, because we may 945 // have more member initializers coming; we'll diagnose it just 946 // once in ActOnMemInitializers. 947 return true; 948 } 949 950 CXXRecordDecl *ClassDecl = Constructor->getParent(); 951 952 // C++ [class.base.init]p2: 953 // Names in a mem-initializer-id are looked up in the scope of the 954 // constructor’s class and, if not found in that scope, are looked 955 // up in the scope containing the constructor’s 956 // definition. [Note: if the constructor’s class contains a member 957 // with the same name as a direct or virtual base class of the 958 // class, a mem-initializer-id naming the member or base class and 959 // composed of a single identifier refers to the class member. A 960 // mem-initializer-id for the hidden base class may be specified 961 // using a qualified name. ] 962 if (!SS.getScopeRep() && !TemplateTypeTy) { 963 // Look for a member, first. 964 FieldDecl *Member = 0; 965 DeclContext::lookup_result Result 966 = ClassDecl->lookup(MemberOrBase); 967 if (Result.first != Result.second) 968 Member = dyn_cast<FieldDecl>(*Result.first); 969 970 // FIXME: Handle members of an anonymous union. 971 972 if (Member) 973 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 974 RParenLoc); 975 } 976 // It didn't name a member, so see if it names a class. 977 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 978 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 979 if (!BaseTy) 980 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 981 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 982 983 QualType BaseType = GetTypeFromParser(BaseTy); 984 985 return BuildBaseInitializer(BaseType, (Expr **)Args, NumArgs, IdLoc, 986 RParenLoc, ClassDecl); 987} 988 989/// Checks an initializer expression for use of uninitialized fields, such as 990/// containing the field that is being initialized. Returns true if there is an 991/// uninitialized field was used an updates the SourceLocation parameter; false 992/// otherwise. 993static bool InitExprContainsUninitializedFields(const Stmt* S, 994 const FieldDecl* LhsField, 995 SourceLocation* L) { 996 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 997 if (ME) { 998 const NamedDecl* RhsField = ME->getMemberDecl(); 999 if (RhsField == LhsField) { 1000 // Initializing a field with itself. Throw a warning. 1001 // But wait; there are exceptions! 1002 // Exception #1: The field may not belong to this record. 1003 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1004 const Expr* base = ME->getBase(); 1005 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1006 // Even though the field matches, it does not belong to this record. 1007 return false; 1008 } 1009 // None of the exceptions triggered; return true to indicate an 1010 // uninitialized field was used. 1011 *L = ME->getMemberLoc(); 1012 return true; 1013 } 1014 } 1015 bool found = false; 1016 for (Stmt::const_child_iterator it = S->child_begin(); 1017 it != S->child_end() && found == false; 1018 ++it) { 1019 if (isa<CallExpr>(S)) { 1020 // Do not descend into function calls or constructors, as the use 1021 // of an uninitialized field may be valid. One would have to inspect 1022 // the contents of the function/ctor to determine if it is safe or not. 1023 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1024 // may be safe, depending on what the function/ctor does. 1025 continue; 1026 } 1027 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1028 } 1029 return found; 1030} 1031 1032Sema::MemInitResult 1033Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1034 unsigned NumArgs, SourceLocation IdLoc, 1035 SourceLocation RParenLoc) { 1036 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1037 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1038 ExprTemporaries.clear(); 1039 1040 // Diagnose value-uses of fields to initialize themselves, e.g. 1041 // foo(foo) 1042 // where foo is not also a parameter to the constructor. 1043 // TODO: implement -Wuninitialized and fold this into that framework. 1044 for (unsigned i = 0; i < NumArgs; ++i) { 1045 SourceLocation L; 1046 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1047 // FIXME: Return true in the case when other fields are used before being 1048 // uninitialized. For example, let this field be the i'th field. When 1049 // initializing the i'th field, throw a warning if any of the >= i'th 1050 // fields are used, as they are not yet initialized. 1051 // Right now we are only handling the case where the i'th field uses 1052 // itself in its initializer. 1053 Diag(L, diag::warn_field_is_uninit); 1054 } 1055 } 1056 1057 bool HasDependentArg = false; 1058 for (unsigned i = 0; i < NumArgs; i++) 1059 HasDependentArg |= Args[i]->isTypeDependent(); 1060 1061 CXXConstructorDecl *C = 0; 1062 QualType FieldType = Member->getType(); 1063 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1064 FieldType = Array->getElementType(); 1065 if (FieldType->isDependentType()) { 1066 // Can't check init for dependent type. 1067 } else if (FieldType->isRecordType()) { 1068 // Member is a record (struct/union/class), so pass the initializer 1069 // arguments down to the record's constructor. 1070 if (!HasDependentArg) { 1071 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1072 1073 C = PerformInitializationByConstructor(FieldType, 1074 MultiExprArg(*this, 1075 (void**)Args, 1076 NumArgs), 1077 IdLoc, 1078 SourceRange(IdLoc, RParenLoc), 1079 Member->getDeclName(), IK_Direct, 1080 ConstructorArgs); 1081 1082 if (C) { 1083 // Take over the constructor arguments as our own. 1084 NumArgs = ConstructorArgs.size(); 1085 Args = (Expr **)ConstructorArgs.take(); 1086 } 1087 } 1088 } else if (NumArgs != 1 && NumArgs != 0) { 1089 // The member type is not a record type (or an array of record 1090 // types), so it can be only be default- or copy-initialized. 1091 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 1092 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 1093 } else if (!HasDependentArg) { 1094 Expr *NewExp; 1095 if (NumArgs == 0) { 1096 if (FieldType->isReferenceType()) { 1097 Diag(IdLoc, diag::err_null_intialized_reference_member) 1098 << Member->getDeclName(); 1099 return Diag(Member->getLocation(), diag::note_declared_at); 1100 } 1101 NewExp = new (Context) CXXZeroInitValueExpr(FieldType, IdLoc, RParenLoc); 1102 NumArgs = 1; 1103 } 1104 else 1105 NewExp = (Expr*)Args[0]; 1106 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 1107 return true; 1108 Args[0] = NewExp; 1109 } 1110 1111 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1112 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1113 ExprTemporaries.clear(); 1114 1115 // FIXME: Perform direct initialization of the member. 1116 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 1117 NumArgs, C, IdLoc, RParenLoc); 1118} 1119 1120Sema::MemInitResult 1121Sema::BuildBaseInitializer(QualType BaseType, Expr **Args, 1122 unsigned NumArgs, SourceLocation IdLoc, 1123 SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) { 1124 bool HasDependentArg = false; 1125 for (unsigned i = 0; i < NumArgs; i++) 1126 HasDependentArg |= Args[i]->isTypeDependent(); 1127 1128 if (!BaseType->isDependentType()) { 1129 if (!BaseType->isRecordType()) 1130 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 1131 << BaseType << SourceRange(IdLoc, RParenLoc); 1132 1133 // C++ [class.base.init]p2: 1134 // [...] Unless the mem-initializer-id names a nonstatic data 1135 // member of the constructor’s class or a direct or virtual base 1136 // of that class, the mem-initializer is ill-formed. A 1137 // mem-initializer-list can initialize a base class using any 1138 // name that denotes that base class type. 1139 1140 // First, check for a direct base class. 1141 const CXXBaseSpecifier *DirectBaseSpec = 0; 1142 for (CXXRecordDecl::base_class_const_iterator Base = 1143 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 1144 if (Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1145 // We found a direct base of this type. That's what we're 1146 // initializing. 1147 DirectBaseSpec = &*Base; 1148 break; 1149 } 1150 } 1151 1152 // Check for a virtual base class. 1153 // FIXME: We might be able to short-circuit this if we know in advance that 1154 // there are no virtual bases. 1155 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1156 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1157 // We haven't found a base yet; search the class hierarchy for a 1158 // virtual base class. 1159 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1160 /*DetectVirtual=*/false); 1161 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 1162 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1163 Path != Paths.end(); ++Path) { 1164 if (Path->back().Base->isVirtual()) { 1165 VirtualBaseSpec = Path->back().Base; 1166 break; 1167 } 1168 } 1169 } 1170 } 1171 1172 // C++ [base.class.init]p2: 1173 // If a mem-initializer-id is ambiguous because it designates both 1174 // a direct non-virtual base class and an inherited virtual base 1175 // class, the mem-initializer is ill-formed. 1176 if (DirectBaseSpec && VirtualBaseSpec) 1177 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 1178 << BaseType << SourceRange(IdLoc, RParenLoc); 1179 // C++ [base.class.init]p2: 1180 // Unless the mem-initializer-id names a nonstatic data membeer of the 1181 // constructor's class ot a direst or virtual base of that class, the 1182 // mem-initializer is ill-formed. 1183 if (!DirectBaseSpec && !VirtualBaseSpec) 1184 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 1185 << BaseType << ClassDecl->getNameAsCString() 1186 << SourceRange(IdLoc, RParenLoc); 1187 } 1188 1189 CXXConstructorDecl *C = 0; 1190 if (!BaseType->isDependentType() && !HasDependentArg) { 1191 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 1192 Context.getCanonicalType(BaseType).getUnqualifiedType()); 1193 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1194 1195 C = PerformInitializationByConstructor(BaseType, 1196 MultiExprArg(*this, 1197 (void**)Args, NumArgs), 1198 IdLoc, SourceRange(IdLoc, RParenLoc), 1199 Name, IK_Direct, 1200 ConstructorArgs); 1201 if (C) { 1202 // Take over the constructor arguments as our own. 1203 NumArgs = ConstructorArgs.size(); 1204 Args = (Expr **)ConstructorArgs.take(); 1205 } 1206 } 1207 1208 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1209 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1210 ExprTemporaries.clear(); 1211 1212 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 1213 NumArgs, C, IdLoc, RParenLoc); 1214} 1215 1216bool 1217Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1218 CXXBaseOrMemberInitializer **Initializers, 1219 unsigned NumInitializers, 1220 bool IsImplicitConstructor) { 1221 // We need to build the initializer AST according to order of construction 1222 // and not what user specified in the Initializers list. 1223 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1224 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1225 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1226 bool HasDependentBaseInit = false; 1227 bool HadError = false; 1228 1229 for (unsigned i = 0; i < NumInitializers; i++) { 1230 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1231 if (Member->isBaseInitializer()) { 1232 if (Member->getBaseClass()->isDependentType()) 1233 HasDependentBaseInit = true; 1234 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1235 } else { 1236 AllBaseFields[Member->getMember()] = Member; 1237 } 1238 } 1239 1240 if (HasDependentBaseInit) { 1241 // FIXME. This does not preserve the ordering of the initializers. 1242 // Try (with -Wreorder) 1243 // template<class X> struct A {}; 1244 // template<class X> struct B : A<X> { 1245 // B() : x1(10), A<X>() {} 1246 // int x1; 1247 // }; 1248 // B<int> x; 1249 // On seeing one dependent type, we should essentially exit this routine 1250 // while preserving user-declared initializer list. When this routine is 1251 // called during instantiatiation process, this routine will rebuild the 1252 // ordered initializer list correctly. 1253 1254 // If we have a dependent base initialization, we can't determine the 1255 // association between initializers and bases; just dump the known 1256 // initializers into the list, and don't try to deal with other bases. 1257 for (unsigned i = 0; i < NumInitializers; i++) { 1258 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1259 if (Member->isBaseInitializer()) 1260 AllToInit.push_back(Member); 1261 } 1262 } else { 1263 // Push virtual bases before others. 1264 for (CXXRecordDecl::base_class_iterator VBase = 1265 ClassDecl->vbases_begin(), 1266 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1267 if (VBase->getType()->isDependentType()) 1268 continue; 1269 if (CXXBaseOrMemberInitializer *Value 1270 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1271 AllToInit.push_back(Value); 1272 } 1273 else { 1274 CXXRecordDecl *VBaseDecl = 1275 cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1276 assert(VBaseDecl && "SetBaseOrMemberInitializers - VBaseDecl null"); 1277 CXXConstructorDecl *Ctor = VBaseDecl->getDefaultConstructor(Context); 1278 if (!Ctor) { 1279 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1280 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1281 << 0 << VBase->getType(); 1282 Diag(VBaseDecl->getLocation(), diag::note_previous_class_decl) 1283 << Context.getTagDeclType(VBaseDecl); 1284 HadError = true; 1285 continue; 1286 } 1287 1288 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1289 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1290 Constructor->getLocation(), CtorArgs)) 1291 continue; 1292 1293 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1294 1295 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1296 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1297 ExprTemporaries.clear(); 1298 CXXBaseOrMemberInitializer *Member = 1299 new (Context) CXXBaseOrMemberInitializer(VBase->getType(), 1300 CtorArgs.takeAs<Expr>(), 1301 CtorArgs.size(), Ctor, 1302 SourceLocation(), 1303 SourceLocation()); 1304 AllToInit.push_back(Member); 1305 } 1306 } 1307 1308 for (CXXRecordDecl::base_class_iterator Base = 1309 ClassDecl->bases_begin(), 1310 E = ClassDecl->bases_end(); Base != E; ++Base) { 1311 // Virtuals are in the virtual base list and already constructed. 1312 if (Base->isVirtual()) 1313 continue; 1314 // Skip dependent types. 1315 if (Base->getType()->isDependentType()) 1316 continue; 1317 if (CXXBaseOrMemberInitializer *Value 1318 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1319 AllToInit.push_back(Value); 1320 } 1321 else { 1322 CXXRecordDecl *BaseDecl = 1323 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1324 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1325 CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context); 1326 if (!Ctor) { 1327 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1328 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1329 << 0 << Base->getType(); 1330 Diag(BaseDecl->getLocation(), diag::note_previous_class_decl) 1331 << Context.getTagDeclType(BaseDecl); 1332 HadError = true; 1333 continue; 1334 } 1335 1336 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1337 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1338 Constructor->getLocation(), CtorArgs)) 1339 continue; 1340 1341 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1342 1343 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1344 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1345 ExprTemporaries.clear(); 1346 CXXBaseOrMemberInitializer *Member = 1347 new (Context) CXXBaseOrMemberInitializer(Base->getType(), 1348 CtorArgs.takeAs<Expr>(), 1349 CtorArgs.size(), Ctor, 1350 SourceLocation(), 1351 SourceLocation()); 1352 AllToInit.push_back(Member); 1353 } 1354 } 1355 } 1356 1357 // non-static data members. 1358 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1359 E = ClassDecl->field_end(); Field != E; ++Field) { 1360 if ((*Field)->isAnonymousStructOrUnion()) { 1361 if (const RecordType *FieldClassType = 1362 Field->getType()->getAs<RecordType>()) { 1363 CXXRecordDecl *FieldClassDecl 1364 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1365 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1366 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1367 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1368 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1369 // set to the anonymous union data member used in the initializer 1370 // list. 1371 Value->setMember(*Field); 1372 Value->setAnonUnionMember(*FA); 1373 AllToInit.push_back(Value); 1374 break; 1375 } 1376 } 1377 } 1378 continue; 1379 } 1380 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1381 AllToInit.push_back(Value); 1382 continue; 1383 } 1384 1385 if ((*Field)->getType()->isDependentType()) 1386 continue; 1387 1388 QualType FT = Context.getBaseElementType((*Field)->getType()); 1389 if (const RecordType* RT = FT->getAs<RecordType>()) { 1390 CXXConstructorDecl *Ctor = 1391 cast<CXXRecordDecl>(RT->getDecl())->getDefaultConstructor(Context); 1392 if (!Ctor) { 1393 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1394 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1395 << 1 << (*Field)->getDeclName(); 1396 Diag(Field->getLocation(), diag::note_field_decl); 1397 Diag(RT->getDecl()->getLocation(), diag::note_previous_class_decl) 1398 << Context.getTagDeclType(RT->getDecl()); 1399 HadError = true; 1400 continue; 1401 } 1402 1403 if (FT.isConstQualified() && Ctor->isTrivial()) { 1404 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1405 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1406 << 1 << (*Field)->getDeclName(); 1407 Diag((*Field)->getLocation(), diag::note_declared_at); 1408 HadError = true; 1409 } 1410 1411 // Don't create initializers for trivial constructors, since they don't 1412 // actually need to be run. 1413 if (Ctor->isTrivial()) 1414 continue; 1415 1416 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1417 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1418 Constructor->getLocation(), CtorArgs)) 1419 continue; 1420 1421 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1422 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1423 ExprTemporaries.clear(); 1424 CXXBaseOrMemberInitializer *Member = 1425 new (Context) CXXBaseOrMemberInitializer(*Field,CtorArgs.takeAs<Expr>(), 1426 CtorArgs.size(), Ctor, 1427 SourceLocation(), 1428 SourceLocation()); 1429 1430 AllToInit.push_back(Member); 1431 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1432 } 1433 else if (FT->isReferenceType()) { 1434 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1435 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1436 << 0 << (*Field)->getDeclName(); 1437 Diag((*Field)->getLocation(), diag::note_declared_at); 1438 HadError = true; 1439 } 1440 else if (FT.isConstQualified()) { 1441 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1442 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1443 << 1 << (*Field)->getDeclName(); 1444 Diag((*Field)->getLocation(), diag::note_declared_at); 1445 HadError = true; 1446 } 1447 } 1448 1449 NumInitializers = AllToInit.size(); 1450 if (NumInitializers > 0) { 1451 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1452 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1453 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1454 1455 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1456 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) 1457 baseOrMemberInitializers[Idx] = AllToInit[Idx]; 1458 } 1459 1460 return HadError; 1461} 1462 1463static void *GetKeyForTopLevelField(FieldDecl *Field) { 1464 // For anonymous unions, use the class declaration as the key. 1465 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1466 if (RT->getDecl()->isAnonymousStructOrUnion()) 1467 return static_cast<void *>(RT->getDecl()); 1468 } 1469 return static_cast<void *>(Field); 1470} 1471 1472static void *GetKeyForBase(QualType BaseType) { 1473 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1474 return (void *)RT; 1475 1476 assert(0 && "Unexpected base type!"); 1477 return 0; 1478} 1479 1480static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1481 bool MemberMaybeAnon = false) { 1482 // For fields injected into the class via declaration of an anonymous union, 1483 // use its anonymous union class declaration as the unique key. 1484 if (Member->isMemberInitializer()) { 1485 FieldDecl *Field = Member->getMember(); 1486 1487 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1488 // data member of the class. Data member used in the initializer list is 1489 // in AnonUnionMember field. 1490 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1491 Field = Member->getAnonUnionMember(); 1492 if (Field->getDeclContext()->isRecord()) { 1493 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1494 if (RD->isAnonymousStructOrUnion()) 1495 return static_cast<void *>(RD); 1496 } 1497 return static_cast<void *>(Field); 1498 } 1499 1500 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1501} 1502 1503/// ActOnMemInitializers - Handle the member initializers for a constructor. 1504void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1505 SourceLocation ColonLoc, 1506 MemInitTy **MemInits, unsigned NumMemInits) { 1507 if (!ConstructorDecl) 1508 return; 1509 1510 AdjustDeclIfTemplate(ConstructorDecl); 1511 1512 CXXConstructorDecl *Constructor 1513 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1514 1515 if (!Constructor) { 1516 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1517 return; 1518 } 1519 1520 if (!Constructor->isDependentContext()) { 1521 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1522 bool err = false; 1523 for (unsigned i = 0; i < NumMemInits; i++) { 1524 CXXBaseOrMemberInitializer *Member = 1525 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1526 void *KeyToMember = GetKeyForMember(Member); 1527 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1528 if (!PrevMember) { 1529 PrevMember = Member; 1530 continue; 1531 } 1532 if (FieldDecl *Field = Member->getMember()) 1533 Diag(Member->getSourceLocation(), 1534 diag::error_multiple_mem_initialization) 1535 << Field->getNameAsString(); 1536 else { 1537 Type *BaseClass = Member->getBaseClass(); 1538 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1539 Diag(Member->getSourceLocation(), 1540 diag::error_multiple_base_initialization) 1541 << QualType(BaseClass, 0); 1542 } 1543 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1544 << 0; 1545 err = true; 1546 } 1547 1548 if (err) 1549 return; 1550 } 1551 1552 SetBaseOrMemberInitializers(Constructor, 1553 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1554 NumMemInits, false); 1555 1556 if (Constructor->isDependentContext()) 1557 return; 1558 1559 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1560 Diagnostic::Ignored && 1561 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1562 Diagnostic::Ignored) 1563 return; 1564 1565 // Also issue warning if order of ctor-initializer list does not match order 1566 // of 1) base class declarations and 2) order of non-static data members. 1567 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1568 1569 CXXRecordDecl *ClassDecl 1570 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1571 // Push virtual bases before others. 1572 for (CXXRecordDecl::base_class_iterator VBase = 1573 ClassDecl->vbases_begin(), 1574 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1575 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1576 1577 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1578 E = ClassDecl->bases_end(); Base != E; ++Base) { 1579 // Virtuals are alread in the virtual base list and are constructed 1580 // first. 1581 if (Base->isVirtual()) 1582 continue; 1583 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1584 } 1585 1586 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1587 E = ClassDecl->field_end(); Field != E; ++Field) 1588 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1589 1590 int Last = AllBaseOrMembers.size(); 1591 int curIndex = 0; 1592 CXXBaseOrMemberInitializer *PrevMember = 0; 1593 for (unsigned i = 0; i < NumMemInits; i++) { 1594 CXXBaseOrMemberInitializer *Member = 1595 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1596 void *MemberInCtorList = GetKeyForMember(Member, true); 1597 1598 for (; curIndex < Last; curIndex++) 1599 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1600 break; 1601 if (curIndex == Last) { 1602 assert(PrevMember && "Member not in member list?!"); 1603 // Initializer as specified in ctor-initializer list is out of order. 1604 // Issue a warning diagnostic. 1605 if (PrevMember->isBaseInitializer()) { 1606 // Diagnostics is for an initialized base class. 1607 Type *BaseClass = PrevMember->getBaseClass(); 1608 Diag(PrevMember->getSourceLocation(), 1609 diag::warn_base_initialized) 1610 << QualType(BaseClass, 0); 1611 } else { 1612 FieldDecl *Field = PrevMember->getMember(); 1613 Diag(PrevMember->getSourceLocation(), 1614 diag::warn_field_initialized) 1615 << Field->getNameAsString(); 1616 } 1617 // Also the note! 1618 if (FieldDecl *Field = Member->getMember()) 1619 Diag(Member->getSourceLocation(), 1620 diag::note_fieldorbase_initialized_here) << 0 1621 << Field->getNameAsString(); 1622 else { 1623 Type *BaseClass = Member->getBaseClass(); 1624 Diag(Member->getSourceLocation(), 1625 diag::note_fieldorbase_initialized_here) << 1 1626 << QualType(BaseClass, 0); 1627 } 1628 for (curIndex = 0; curIndex < Last; curIndex++) 1629 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1630 break; 1631 } 1632 PrevMember = Member; 1633 } 1634} 1635 1636void 1637Sema::MarkBaseAndMemberDestructorsReferenced(CXXDestructorDecl *Destructor) { 1638 // Ignore dependent destructors. 1639 if (Destructor->isDependentContext()) 1640 return; 1641 1642 CXXRecordDecl *ClassDecl = Destructor->getParent(); 1643 1644 // Non-static data members. 1645 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1646 E = ClassDecl->field_end(); I != E; ++I) { 1647 FieldDecl *Field = *I; 1648 1649 QualType FieldType = Context.getBaseElementType(Field->getType()); 1650 1651 const RecordType* RT = FieldType->getAs<RecordType>(); 1652 if (!RT) 1653 continue; 1654 1655 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1656 if (FieldClassDecl->hasTrivialDestructor()) 1657 continue; 1658 1659 const CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1660 MarkDeclarationReferenced(Destructor->getLocation(), 1661 const_cast<CXXDestructorDecl*>(Dtor)); 1662 } 1663 1664 // Bases. 1665 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1666 E = ClassDecl->bases_end(); Base != E; ++Base) { 1667 // Ignore virtual bases. 1668 if (Base->isVirtual()) 1669 continue; 1670 1671 // Ignore trivial destructors. 1672 CXXRecordDecl *BaseClassDecl 1673 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1674 if (BaseClassDecl->hasTrivialDestructor()) 1675 continue; 1676 1677 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1678 MarkDeclarationReferenced(Destructor->getLocation(), 1679 const_cast<CXXDestructorDecl*>(Dtor)); 1680 } 1681 1682 // Virtual bases. 1683 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1684 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1685 // Ignore trivial destructors. 1686 CXXRecordDecl *BaseClassDecl 1687 = cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1688 if (BaseClassDecl->hasTrivialDestructor()) 1689 continue; 1690 1691 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1692 MarkDeclarationReferenced(Destructor->getLocation(), 1693 const_cast<CXXDestructorDecl*>(Dtor)); 1694 } 1695} 1696 1697void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1698 if (!CDtorDecl) 1699 return; 1700 1701 AdjustDeclIfTemplate(CDtorDecl); 1702 1703 if (CXXConstructorDecl *Constructor 1704 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1705 SetBaseOrMemberInitializers(Constructor, 0, 0, false); 1706} 1707 1708namespace { 1709 /// PureVirtualMethodCollector - traverses a class and its superclasses 1710 /// and determines if it has any pure virtual methods. 1711 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 1712 ASTContext &Context; 1713 1714 public: 1715 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1716 1717 private: 1718 MethodList Methods; 1719 1720 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1721 1722 public: 1723 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1724 : Context(Ctx) { 1725 1726 MethodList List; 1727 Collect(RD, List); 1728 1729 // Copy the temporary list to methods, and make sure to ignore any 1730 // null entries. 1731 for (size_t i = 0, e = List.size(); i != e; ++i) { 1732 if (List[i]) 1733 Methods.push_back(List[i]); 1734 } 1735 } 1736 1737 bool empty() const { return Methods.empty(); } 1738 1739 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1740 MethodList::const_iterator methods_end() { return Methods.end(); } 1741 }; 1742 1743 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1744 MethodList& Methods) { 1745 // First, collect the pure virtual methods for the base classes. 1746 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1747 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1748 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1749 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1750 if (BaseDecl && BaseDecl->isAbstract()) 1751 Collect(BaseDecl, Methods); 1752 } 1753 } 1754 1755 // Next, zero out any pure virtual methods that this class overrides. 1756 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1757 1758 MethodSetTy OverriddenMethods; 1759 size_t MethodsSize = Methods.size(); 1760 1761 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1762 i != e; ++i) { 1763 // Traverse the record, looking for methods. 1764 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1765 // If the method is pure virtual, add it to the methods vector. 1766 if (MD->isPure()) 1767 Methods.push_back(MD); 1768 1769 // Record all the overridden methods in our set. 1770 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1771 E = MD->end_overridden_methods(); I != E; ++I) { 1772 // Keep track of the overridden methods. 1773 OverriddenMethods.insert(*I); 1774 } 1775 } 1776 } 1777 1778 // Now go through the methods and zero out all the ones we know are 1779 // overridden. 1780 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1781 if (OverriddenMethods.count(Methods[i])) 1782 Methods[i] = 0; 1783 } 1784 1785 } 1786} 1787 1788 1789bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1790 unsigned DiagID, AbstractDiagSelID SelID, 1791 const CXXRecordDecl *CurrentRD) { 1792 if (SelID == -1) 1793 return RequireNonAbstractType(Loc, T, 1794 PDiag(DiagID), CurrentRD); 1795 else 1796 return RequireNonAbstractType(Loc, T, 1797 PDiag(DiagID) << SelID, CurrentRD); 1798} 1799 1800bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1801 const PartialDiagnostic &PD, 1802 const CXXRecordDecl *CurrentRD) { 1803 if (!getLangOptions().CPlusPlus) 1804 return false; 1805 1806 if (const ArrayType *AT = Context.getAsArrayType(T)) 1807 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1808 CurrentRD); 1809 1810 if (const PointerType *PT = T->getAs<PointerType>()) { 1811 // Find the innermost pointer type. 1812 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1813 PT = T; 1814 1815 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1816 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1817 } 1818 1819 const RecordType *RT = T->getAs<RecordType>(); 1820 if (!RT) 1821 return false; 1822 1823 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1824 if (!RD) 1825 return false; 1826 1827 if (CurrentRD && CurrentRD != RD) 1828 return false; 1829 1830 if (!RD->isAbstract()) 1831 return false; 1832 1833 Diag(Loc, PD) << RD->getDeclName(); 1834 1835 // Check if we've already emitted the list of pure virtual functions for this 1836 // class. 1837 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1838 return true; 1839 1840 PureVirtualMethodCollector Collector(Context, RD); 1841 1842 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1843 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1844 const CXXMethodDecl *MD = *I; 1845 1846 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1847 MD->getDeclName(); 1848 } 1849 1850 if (!PureVirtualClassDiagSet) 1851 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1852 PureVirtualClassDiagSet->insert(RD); 1853 1854 return true; 1855} 1856 1857namespace { 1858 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1859 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1860 Sema &SemaRef; 1861 CXXRecordDecl *AbstractClass; 1862 1863 bool VisitDeclContext(const DeclContext *DC) { 1864 bool Invalid = false; 1865 1866 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1867 E = DC->decls_end(); I != E; ++I) 1868 Invalid |= Visit(*I); 1869 1870 return Invalid; 1871 } 1872 1873 public: 1874 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1875 : SemaRef(SemaRef), AbstractClass(ac) { 1876 Visit(SemaRef.Context.getTranslationUnitDecl()); 1877 } 1878 1879 bool VisitFunctionDecl(const FunctionDecl *FD) { 1880 if (FD->isThisDeclarationADefinition()) { 1881 // No need to do the check if we're in a definition, because it requires 1882 // that the return/param types are complete. 1883 // because that requires 1884 return VisitDeclContext(FD); 1885 } 1886 1887 // Check the return type. 1888 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 1889 bool Invalid = 1890 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1891 diag::err_abstract_type_in_decl, 1892 Sema::AbstractReturnType, 1893 AbstractClass); 1894 1895 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1896 E = FD->param_end(); I != E; ++I) { 1897 const ParmVarDecl *VD = *I; 1898 Invalid |= 1899 SemaRef.RequireNonAbstractType(VD->getLocation(), 1900 VD->getOriginalType(), 1901 diag::err_abstract_type_in_decl, 1902 Sema::AbstractParamType, 1903 AbstractClass); 1904 } 1905 1906 return Invalid; 1907 } 1908 1909 bool VisitDecl(const Decl* D) { 1910 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1911 return VisitDeclContext(DC); 1912 1913 return false; 1914 } 1915 }; 1916} 1917 1918void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1919 DeclPtrTy TagDecl, 1920 SourceLocation LBrac, 1921 SourceLocation RBrac) { 1922 if (!TagDecl) 1923 return; 1924 1925 AdjustDeclIfTemplate(TagDecl); 1926 ActOnFields(S, RLoc, TagDecl, 1927 (DeclPtrTy*)FieldCollector->getCurFields(), 1928 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1929 1930 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1931 if (!RD->isAbstract()) { 1932 // Collect all the pure virtual methods and see if this is an abstract 1933 // class after all. 1934 PureVirtualMethodCollector Collector(Context, RD); 1935 if (!Collector.empty()) 1936 RD->setAbstract(true); 1937 } 1938 1939 if (RD->isAbstract()) 1940 (void)AbstractClassUsageDiagnoser(*this, RD); 1941 1942 if (!RD->isDependentType() && !RD->isInvalidDecl()) 1943 AddImplicitlyDeclaredMembersToClass(RD); 1944} 1945 1946/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1947/// special functions, such as the default constructor, copy 1948/// constructor, or destructor, to the given C++ class (C++ 1949/// [special]p1). This routine can only be executed just before the 1950/// definition of the class is complete. 1951void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1952 CanQualType ClassType 1953 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1954 1955 // FIXME: Implicit declarations have exception specifications, which are 1956 // the union of the specifications of the implicitly called functions. 1957 1958 if (!ClassDecl->hasUserDeclaredConstructor()) { 1959 // C++ [class.ctor]p5: 1960 // A default constructor for a class X is a constructor of class X 1961 // that can be called without an argument. If there is no 1962 // user-declared constructor for class X, a default constructor is 1963 // implicitly declared. An implicitly-declared default constructor 1964 // is an inline public member of its class. 1965 DeclarationName Name 1966 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1967 CXXConstructorDecl *DefaultCon = 1968 CXXConstructorDecl::Create(Context, ClassDecl, 1969 ClassDecl->getLocation(), Name, 1970 Context.getFunctionType(Context.VoidTy, 1971 0, 0, false, 0), 1972 /*DInfo=*/0, 1973 /*isExplicit=*/false, 1974 /*isInline=*/true, 1975 /*isImplicitlyDeclared=*/true); 1976 DefaultCon->setAccess(AS_public); 1977 DefaultCon->setImplicit(); 1978 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1979 ClassDecl->addDecl(DefaultCon); 1980 } 1981 1982 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1983 // C++ [class.copy]p4: 1984 // If the class definition does not explicitly declare a copy 1985 // constructor, one is declared implicitly. 1986 1987 // C++ [class.copy]p5: 1988 // The implicitly-declared copy constructor for a class X will 1989 // have the form 1990 // 1991 // X::X(const X&) 1992 // 1993 // if 1994 bool HasConstCopyConstructor = true; 1995 1996 // -- each direct or virtual base class B of X has a copy 1997 // constructor whose first parameter is of type const B& or 1998 // const volatile B&, and 1999 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2000 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2001 const CXXRecordDecl *BaseClassDecl 2002 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2003 HasConstCopyConstructor 2004 = BaseClassDecl->hasConstCopyConstructor(Context); 2005 } 2006 2007 // -- for all the nonstatic data members of X that are of a 2008 // class type M (or array thereof), each such class type 2009 // has a copy constructor whose first parameter is of type 2010 // const M& or const volatile M&. 2011 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2012 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2013 ++Field) { 2014 QualType FieldType = (*Field)->getType(); 2015 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2016 FieldType = Array->getElementType(); 2017 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2018 const CXXRecordDecl *FieldClassDecl 2019 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2020 HasConstCopyConstructor 2021 = FieldClassDecl->hasConstCopyConstructor(Context); 2022 } 2023 } 2024 2025 // Otherwise, the implicitly declared copy constructor will have 2026 // the form 2027 // 2028 // X::X(X&) 2029 QualType ArgType = ClassType; 2030 if (HasConstCopyConstructor) 2031 ArgType = ArgType.withConst(); 2032 ArgType = Context.getLValueReferenceType(ArgType); 2033 2034 // An implicitly-declared copy constructor is an inline public 2035 // member of its class. 2036 DeclarationName Name 2037 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2038 CXXConstructorDecl *CopyConstructor 2039 = CXXConstructorDecl::Create(Context, ClassDecl, 2040 ClassDecl->getLocation(), Name, 2041 Context.getFunctionType(Context.VoidTy, 2042 &ArgType, 1, 2043 false, 0), 2044 /*DInfo=*/0, 2045 /*isExplicit=*/false, 2046 /*isInline=*/true, 2047 /*isImplicitlyDeclared=*/true); 2048 CopyConstructor->setAccess(AS_public); 2049 CopyConstructor->setImplicit(); 2050 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2051 2052 // Add the parameter to the constructor. 2053 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2054 ClassDecl->getLocation(), 2055 /*IdentifierInfo=*/0, 2056 ArgType, /*DInfo=*/0, 2057 VarDecl::None, 0); 2058 CopyConstructor->setParams(Context, &FromParam, 1); 2059 ClassDecl->addDecl(CopyConstructor); 2060 } 2061 2062 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2063 // Note: The following rules are largely analoguous to the copy 2064 // constructor rules. Note that virtual bases are not taken into account 2065 // for determining the argument type of the operator. Note also that 2066 // operators taking an object instead of a reference are allowed. 2067 // 2068 // C++ [class.copy]p10: 2069 // If the class definition does not explicitly declare a copy 2070 // assignment operator, one is declared implicitly. 2071 // The implicitly-defined copy assignment operator for a class X 2072 // will have the form 2073 // 2074 // X& X::operator=(const X&) 2075 // 2076 // if 2077 bool HasConstCopyAssignment = true; 2078 2079 // -- each direct base class B of X has a copy assignment operator 2080 // whose parameter is of type const B&, const volatile B& or B, 2081 // and 2082 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2083 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2084 assert(!Base->getType()->isDependentType() && 2085 "Cannot generate implicit members for class with dependent bases."); 2086 const CXXRecordDecl *BaseClassDecl 2087 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2088 const CXXMethodDecl *MD = 0; 2089 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2090 MD); 2091 } 2092 2093 // -- for all the nonstatic data members of X that are of a class 2094 // type M (or array thereof), each such class type has a copy 2095 // assignment operator whose parameter is of type const M&, 2096 // const volatile M& or M. 2097 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2098 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2099 ++Field) { 2100 QualType FieldType = (*Field)->getType(); 2101 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2102 FieldType = Array->getElementType(); 2103 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2104 const CXXRecordDecl *FieldClassDecl 2105 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2106 const CXXMethodDecl *MD = 0; 2107 HasConstCopyAssignment 2108 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2109 } 2110 } 2111 2112 // Otherwise, the implicitly declared copy assignment operator will 2113 // have the form 2114 // 2115 // X& X::operator=(X&) 2116 QualType ArgType = ClassType; 2117 QualType RetType = Context.getLValueReferenceType(ArgType); 2118 if (HasConstCopyAssignment) 2119 ArgType = ArgType.withConst(); 2120 ArgType = Context.getLValueReferenceType(ArgType); 2121 2122 // An implicitly-declared copy assignment operator is an inline public 2123 // member of its class. 2124 DeclarationName Name = 2125 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2126 CXXMethodDecl *CopyAssignment = 2127 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2128 Context.getFunctionType(RetType, &ArgType, 1, 2129 false, 0), 2130 /*DInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2131 CopyAssignment->setAccess(AS_public); 2132 CopyAssignment->setImplicit(); 2133 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2134 CopyAssignment->setCopyAssignment(true); 2135 2136 // Add the parameter to the operator. 2137 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2138 ClassDecl->getLocation(), 2139 /*IdentifierInfo=*/0, 2140 ArgType, /*DInfo=*/0, 2141 VarDecl::None, 0); 2142 CopyAssignment->setParams(Context, &FromParam, 1); 2143 2144 // Don't call addedAssignmentOperator. There is no way to distinguish an 2145 // implicit from an explicit assignment operator. 2146 ClassDecl->addDecl(CopyAssignment); 2147 } 2148 2149 if (!ClassDecl->hasUserDeclaredDestructor()) { 2150 // C++ [class.dtor]p2: 2151 // If a class has no user-declared destructor, a destructor is 2152 // declared implicitly. An implicitly-declared destructor is an 2153 // inline public member of its class. 2154 DeclarationName Name 2155 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2156 CXXDestructorDecl *Destructor 2157 = CXXDestructorDecl::Create(Context, ClassDecl, 2158 ClassDecl->getLocation(), Name, 2159 Context.getFunctionType(Context.VoidTy, 2160 0, 0, false, 0), 2161 /*isInline=*/true, 2162 /*isImplicitlyDeclared=*/true); 2163 Destructor->setAccess(AS_public); 2164 Destructor->setImplicit(); 2165 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2166 ClassDecl->addDecl(Destructor); 2167 } 2168} 2169 2170void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2171 Decl *D = TemplateD.getAs<Decl>(); 2172 if (!D) 2173 return; 2174 2175 TemplateParameterList *Params = 0; 2176 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2177 Params = Template->getTemplateParameters(); 2178 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2179 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2180 Params = PartialSpec->getTemplateParameters(); 2181 else 2182 return; 2183 2184 for (TemplateParameterList::iterator Param = Params->begin(), 2185 ParamEnd = Params->end(); 2186 Param != ParamEnd; ++Param) { 2187 NamedDecl *Named = cast<NamedDecl>(*Param); 2188 if (Named->getDeclName()) { 2189 S->AddDecl(DeclPtrTy::make(Named)); 2190 IdResolver.AddDecl(Named); 2191 } 2192 } 2193} 2194 2195/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2196/// parsing a top-level (non-nested) C++ class, and we are now 2197/// parsing those parts of the given Method declaration that could 2198/// not be parsed earlier (C++ [class.mem]p2), such as default 2199/// arguments. This action should enter the scope of the given 2200/// Method declaration as if we had just parsed the qualified method 2201/// name. However, it should not bring the parameters into scope; 2202/// that will be performed by ActOnDelayedCXXMethodParameter. 2203void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2204 if (!MethodD) 2205 return; 2206 2207 AdjustDeclIfTemplate(MethodD); 2208 2209 CXXScopeSpec SS; 2210 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2211 QualType ClassTy 2212 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 2213 SS.setScopeRep( 2214 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 2215 ActOnCXXEnterDeclaratorScope(S, SS); 2216} 2217 2218/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2219/// C++ method declaration. We're (re-)introducing the given 2220/// function parameter into scope for use in parsing later parts of 2221/// the method declaration. For example, we could see an 2222/// ActOnParamDefaultArgument event for this parameter. 2223void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2224 if (!ParamD) 2225 return; 2226 2227 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2228 2229 // If this parameter has an unparsed default argument, clear it out 2230 // to make way for the parsed default argument. 2231 if (Param->hasUnparsedDefaultArg()) 2232 Param->setDefaultArg(0); 2233 2234 S->AddDecl(DeclPtrTy::make(Param)); 2235 if (Param->getDeclName()) 2236 IdResolver.AddDecl(Param); 2237} 2238 2239/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2240/// processing the delayed method declaration for Method. The method 2241/// declaration is now considered finished. There may be a separate 2242/// ActOnStartOfFunctionDef action later (not necessarily 2243/// immediately!) for this method, if it was also defined inside the 2244/// class body. 2245void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2246 if (!MethodD) 2247 return; 2248 2249 AdjustDeclIfTemplate(MethodD); 2250 2251 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2252 CXXScopeSpec SS; 2253 QualType ClassTy 2254 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 2255 SS.setScopeRep( 2256 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 2257 ActOnCXXExitDeclaratorScope(S, SS); 2258 2259 // Now that we have our default arguments, check the constructor 2260 // again. It could produce additional diagnostics or affect whether 2261 // the class has implicitly-declared destructors, among other 2262 // things. 2263 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2264 CheckConstructor(Constructor); 2265 2266 // Check the default arguments, which we may have added. 2267 if (!Method->isInvalidDecl()) 2268 CheckCXXDefaultArguments(Method); 2269} 2270 2271/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2272/// the well-formedness of the constructor declarator @p D with type @p 2273/// R. If there are any errors in the declarator, this routine will 2274/// emit diagnostics and set the invalid bit to true. In any case, the type 2275/// will be updated to reflect a well-formed type for the constructor and 2276/// returned. 2277QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2278 FunctionDecl::StorageClass &SC) { 2279 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2280 2281 // C++ [class.ctor]p3: 2282 // A constructor shall not be virtual (10.3) or static (9.4). A 2283 // constructor can be invoked for a const, volatile or const 2284 // volatile object. A constructor shall not be declared const, 2285 // volatile, or const volatile (9.3.2). 2286 if (isVirtual) { 2287 if (!D.isInvalidType()) 2288 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2289 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2290 << SourceRange(D.getIdentifierLoc()); 2291 D.setInvalidType(); 2292 } 2293 if (SC == FunctionDecl::Static) { 2294 if (!D.isInvalidType()) 2295 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2296 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2297 << SourceRange(D.getIdentifierLoc()); 2298 D.setInvalidType(); 2299 SC = FunctionDecl::None; 2300 } 2301 2302 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2303 if (FTI.TypeQuals != 0) { 2304 if (FTI.TypeQuals & Qualifiers::Const) 2305 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2306 << "const" << SourceRange(D.getIdentifierLoc()); 2307 if (FTI.TypeQuals & Qualifiers::Volatile) 2308 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2309 << "volatile" << SourceRange(D.getIdentifierLoc()); 2310 if (FTI.TypeQuals & Qualifiers::Restrict) 2311 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2312 << "restrict" << SourceRange(D.getIdentifierLoc()); 2313 } 2314 2315 // Rebuild the function type "R" without any type qualifiers (in 2316 // case any of the errors above fired) and with "void" as the 2317 // return type, since constructors don't have return types. We 2318 // *always* have to do this, because GetTypeForDeclarator will 2319 // put in a result type of "int" when none was specified. 2320 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2321 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2322 Proto->getNumArgs(), 2323 Proto->isVariadic(), 0); 2324} 2325 2326/// CheckConstructor - Checks a fully-formed constructor for 2327/// well-formedness, issuing any diagnostics required. Returns true if 2328/// the constructor declarator is invalid. 2329void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2330 CXXRecordDecl *ClassDecl 2331 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2332 if (!ClassDecl) 2333 return Constructor->setInvalidDecl(); 2334 2335 // C++ [class.copy]p3: 2336 // A declaration of a constructor for a class X is ill-formed if 2337 // its first parameter is of type (optionally cv-qualified) X and 2338 // either there are no other parameters or else all other 2339 // parameters have default arguments. 2340 if (!Constructor->isInvalidDecl() && 2341 ((Constructor->getNumParams() == 1) || 2342 (Constructor->getNumParams() > 1 && 2343 Constructor->getParamDecl(1)->hasDefaultArg())) && 2344 Constructor->getTemplateSpecializationKind() 2345 != TSK_ImplicitInstantiation) { 2346 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2347 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2348 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2349 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2350 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2351 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2352 2353 // FIXME: Rather that making the constructor invalid, we should endeavor 2354 // to fix the type. 2355 Constructor->setInvalidDecl(); 2356 } 2357 } 2358 2359 // Notify the class that we've added a constructor. 2360 ClassDecl->addedConstructor(Context, Constructor); 2361} 2362 2363/// CheckDestructor - Checks a fully-formed destructor for 2364/// well-formedness, issuing any diagnostics required. 2365void Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2366 CXXRecordDecl *RD = Destructor->getParent(); 2367 2368 if (Destructor->isVirtual()) { 2369 SourceLocation Loc; 2370 2371 if (!Destructor->isImplicit()) 2372 Loc = Destructor->getLocation(); 2373 else 2374 Loc = RD->getLocation(); 2375 2376 // If we have a virtual destructor, look up the deallocation function 2377 FunctionDecl *OperatorDelete = 0; 2378 DeclarationName Name = 2379 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2380 if (!FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2381 Destructor->setOperatorDelete(OperatorDelete); 2382 } 2383} 2384 2385static inline bool 2386FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2387 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2388 FTI.ArgInfo[0].Param && 2389 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2390} 2391 2392/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2393/// the well-formednes of the destructor declarator @p D with type @p 2394/// R. If there are any errors in the declarator, this routine will 2395/// emit diagnostics and set the declarator to invalid. Even if this happens, 2396/// will be updated to reflect a well-formed type for the destructor and 2397/// returned. 2398QualType Sema::CheckDestructorDeclarator(Declarator &D, 2399 FunctionDecl::StorageClass& SC) { 2400 // C++ [class.dtor]p1: 2401 // [...] A typedef-name that names a class is a class-name 2402 // (7.1.3); however, a typedef-name that names a class shall not 2403 // be used as the identifier in the declarator for a destructor 2404 // declaration. 2405 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2406 if (isa<TypedefType>(DeclaratorType)) { 2407 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2408 << DeclaratorType; 2409 D.setInvalidType(); 2410 } 2411 2412 // C++ [class.dtor]p2: 2413 // A destructor is used to destroy objects of its class type. A 2414 // destructor takes no parameters, and no return type can be 2415 // specified for it (not even void). The address of a destructor 2416 // shall not be taken. A destructor shall not be static. A 2417 // destructor can be invoked for a const, volatile or const 2418 // volatile object. A destructor shall not be declared const, 2419 // volatile or const volatile (9.3.2). 2420 if (SC == FunctionDecl::Static) { 2421 if (!D.isInvalidType()) 2422 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2423 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2424 << SourceRange(D.getIdentifierLoc()); 2425 SC = FunctionDecl::None; 2426 D.setInvalidType(); 2427 } 2428 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2429 // Destructors don't have return types, but the parser will 2430 // happily parse something like: 2431 // 2432 // class X { 2433 // float ~X(); 2434 // }; 2435 // 2436 // The return type will be eliminated later. 2437 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2438 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2439 << SourceRange(D.getIdentifierLoc()); 2440 } 2441 2442 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2443 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2444 if (FTI.TypeQuals & Qualifiers::Const) 2445 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2446 << "const" << SourceRange(D.getIdentifierLoc()); 2447 if (FTI.TypeQuals & Qualifiers::Volatile) 2448 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2449 << "volatile" << SourceRange(D.getIdentifierLoc()); 2450 if (FTI.TypeQuals & Qualifiers::Restrict) 2451 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2452 << "restrict" << SourceRange(D.getIdentifierLoc()); 2453 D.setInvalidType(); 2454 } 2455 2456 // Make sure we don't have any parameters. 2457 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2458 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2459 2460 // Delete the parameters. 2461 FTI.freeArgs(); 2462 D.setInvalidType(); 2463 } 2464 2465 // Make sure the destructor isn't variadic. 2466 if (FTI.isVariadic) { 2467 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2468 D.setInvalidType(); 2469 } 2470 2471 // Rebuild the function type "R" without any type qualifiers or 2472 // parameters (in case any of the errors above fired) and with 2473 // "void" as the return type, since destructors don't have return 2474 // types. We *always* have to do this, because GetTypeForDeclarator 2475 // will put in a result type of "int" when none was specified. 2476 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 2477} 2478 2479/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2480/// well-formednes of the conversion function declarator @p D with 2481/// type @p R. If there are any errors in the declarator, this routine 2482/// will emit diagnostics and return true. Otherwise, it will return 2483/// false. Either way, the type @p R will be updated to reflect a 2484/// well-formed type for the conversion operator. 2485void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2486 FunctionDecl::StorageClass& SC) { 2487 // C++ [class.conv.fct]p1: 2488 // Neither parameter types nor return type can be specified. The 2489 // type of a conversion function (8.3.5) is "function taking no 2490 // parameter returning conversion-type-id." 2491 if (SC == FunctionDecl::Static) { 2492 if (!D.isInvalidType()) 2493 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2494 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2495 << SourceRange(D.getIdentifierLoc()); 2496 D.setInvalidType(); 2497 SC = FunctionDecl::None; 2498 } 2499 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2500 // Conversion functions don't have return types, but the parser will 2501 // happily parse something like: 2502 // 2503 // class X { 2504 // float operator bool(); 2505 // }; 2506 // 2507 // The return type will be changed later anyway. 2508 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2509 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2510 << SourceRange(D.getIdentifierLoc()); 2511 } 2512 2513 // Make sure we don't have any parameters. 2514 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2515 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2516 2517 // Delete the parameters. 2518 D.getTypeObject(0).Fun.freeArgs(); 2519 D.setInvalidType(); 2520 } 2521 2522 // Make sure the conversion function isn't variadic. 2523 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2524 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2525 D.setInvalidType(); 2526 } 2527 2528 // C++ [class.conv.fct]p4: 2529 // The conversion-type-id shall not represent a function type nor 2530 // an array type. 2531 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2532 if (ConvType->isArrayType()) { 2533 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2534 ConvType = Context.getPointerType(ConvType); 2535 D.setInvalidType(); 2536 } else if (ConvType->isFunctionType()) { 2537 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2538 ConvType = Context.getPointerType(ConvType); 2539 D.setInvalidType(); 2540 } 2541 2542 // Rebuild the function type "R" without any parameters (in case any 2543 // of the errors above fired) and with the conversion type as the 2544 // return type. 2545 R = Context.getFunctionType(ConvType, 0, 0, false, 2546 R->getAs<FunctionProtoType>()->getTypeQuals()); 2547 2548 // C++0x explicit conversion operators. 2549 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2550 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2551 diag::warn_explicit_conversion_functions) 2552 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2553} 2554 2555/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2556/// the declaration of the given C++ conversion function. This routine 2557/// is responsible for recording the conversion function in the C++ 2558/// class, if possible. 2559Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2560 assert(Conversion && "Expected to receive a conversion function declaration"); 2561 2562 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2563 2564 // Make sure we aren't redeclaring the conversion function. 2565 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2566 2567 // C++ [class.conv.fct]p1: 2568 // [...] A conversion function is never used to convert a 2569 // (possibly cv-qualified) object to the (possibly cv-qualified) 2570 // same object type (or a reference to it), to a (possibly 2571 // cv-qualified) base class of that type (or a reference to it), 2572 // or to (possibly cv-qualified) void. 2573 // FIXME: Suppress this warning if the conversion function ends up being a 2574 // virtual function that overrides a virtual function in a base class. 2575 QualType ClassType 2576 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2577 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2578 ConvType = ConvTypeRef->getPointeeType(); 2579 if (ConvType->isRecordType()) { 2580 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2581 if (ConvType == ClassType) 2582 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2583 << ClassType; 2584 else if (IsDerivedFrom(ClassType, ConvType)) 2585 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2586 << ClassType << ConvType; 2587 } else if (ConvType->isVoidType()) { 2588 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2589 << ClassType << ConvType; 2590 } 2591 2592 if (Conversion->getPreviousDeclaration()) { 2593 const NamedDecl *ExpectedPrevDecl = Conversion->getPreviousDeclaration(); 2594 if (FunctionTemplateDecl *ConversionTemplate 2595 = Conversion->getDescribedFunctionTemplate()) 2596 ExpectedPrevDecl = ConversionTemplate->getPreviousDeclaration(); 2597 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 2598 for (OverloadedFunctionDecl::function_iterator 2599 Conv = Conversions->function_begin(), 2600 ConvEnd = Conversions->function_end(); 2601 Conv != ConvEnd; ++Conv) { 2602 if (*Conv == ExpectedPrevDecl) { 2603 *Conv = Conversion; 2604 return DeclPtrTy::make(Conversion); 2605 } 2606 } 2607 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2608 } else if (FunctionTemplateDecl *ConversionTemplate 2609 = Conversion->getDescribedFunctionTemplate()) 2610 ClassDecl->addConversionFunction(ConversionTemplate); 2611 else if (!Conversion->getPrimaryTemplate()) // ignore specializations 2612 ClassDecl->addConversionFunction(Conversion); 2613 2614 return DeclPtrTy::make(Conversion); 2615} 2616 2617//===----------------------------------------------------------------------===// 2618// Namespace Handling 2619//===----------------------------------------------------------------------===// 2620 2621/// ActOnStartNamespaceDef - This is called at the start of a namespace 2622/// definition. 2623Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2624 SourceLocation IdentLoc, 2625 IdentifierInfo *II, 2626 SourceLocation LBrace) { 2627 NamespaceDecl *Namespc = 2628 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2629 Namespc->setLBracLoc(LBrace); 2630 2631 Scope *DeclRegionScope = NamespcScope->getParent(); 2632 2633 if (II) { 2634 // C++ [namespace.def]p2: 2635 // The identifier in an original-namespace-definition shall not have been 2636 // previously defined in the declarative region in which the 2637 // original-namespace-definition appears. The identifier in an 2638 // original-namespace-definition is the name of the namespace. Subsequently 2639 // in that declarative region, it is treated as an original-namespace-name. 2640 2641 NamedDecl *PrevDecl 2642 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2643 ForRedeclaration); 2644 2645 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2646 // This is an extended namespace definition. 2647 // Attach this namespace decl to the chain of extended namespace 2648 // definitions. 2649 OrigNS->setNextNamespace(Namespc); 2650 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2651 2652 // Remove the previous declaration from the scope. 2653 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2654 IdResolver.RemoveDecl(OrigNS); 2655 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2656 } 2657 } else if (PrevDecl) { 2658 // This is an invalid name redefinition. 2659 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2660 << Namespc->getDeclName(); 2661 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2662 Namespc->setInvalidDecl(); 2663 // Continue on to push Namespc as current DeclContext and return it. 2664 } else if (II->isStr("std") && 2665 CurContext->getLookupContext()->isTranslationUnit()) { 2666 // This is the first "real" definition of the namespace "std", so update 2667 // our cache of the "std" namespace to point at this definition. 2668 if (StdNamespace) { 2669 // We had already defined a dummy namespace "std". Link this new 2670 // namespace definition to the dummy namespace "std". 2671 StdNamespace->setNextNamespace(Namespc); 2672 StdNamespace->setLocation(IdentLoc); 2673 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2674 } 2675 2676 // Make our StdNamespace cache point at the first real definition of the 2677 // "std" namespace. 2678 StdNamespace = Namespc; 2679 } 2680 2681 PushOnScopeChains(Namespc, DeclRegionScope); 2682 } else { 2683 // Anonymous namespaces. 2684 2685 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2686 // behaves as if it were replaced by 2687 // namespace unique { /* empty body */ } 2688 // using namespace unique; 2689 // namespace unique { namespace-body } 2690 // where all occurrences of 'unique' in a translation unit are 2691 // replaced by the same identifier and this identifier differs 2692 // from all other identifiers in the entire program. 2693 2694 // We just create the namespace with an empty name and then add an 2695 // implicit using declaration, just like the standard suggests. 2696 // 2697 // CodeGen enforces the "universally unique" aspect by giving all 2698 // declarations semantically contained within an anonymous 2699 // namespace internal linkage. 2700 2701 assert(Namespc->isAnonymousNamespace()); 2702 CurContext->addDecl(Namespc); 2703 2704 UsingDirectiveDecl* UD 2705 = UsingDirectiveDecl::Create(Context, CurContext, 2706 /* 'using' */ LBrace, 2707 /* 'namespace' */ SourceLocation(), 2708 /* qualifier */ SourceRange(), 2709 /* NNS */ NULL, 2710 /* identifier */ SourceLocation(), 2711 Namespc, 2712 /* Ancestor */ CurContext); 2713 UD->setImplicit(); 2714 CurContext->addDecl(UD); 2715 } 2716 2717 // Although we could have an invalid decl (i.e. the namespace name is a 2718 // redefinition), push it as current DeclContext and try to continue parsing. 2719 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2720 // for the namespace has the declarations that showed up in that particular 2721 // namespace definition. 2722 PushDeclContext(NamespcScope, Namespc); 2723 return DeclPtrTy::make(Namespc); 2724} 2725 2726/// ActOnFinishNamespaceDef - This callback is called after a namespace is 2727/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 2728void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 2729 Decl *Dcl = D.getAs<Decl>(); 2730 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 2731 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 2732 Namespc->setRBracLoc(RBrace); 2733 PopDeclContext(); 2734} 2735 2736Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 2737 SourceLocation UsingLoc, 2738 SourceLocation NamespcLoc, 2739 const CXXScopeSpec &SS, 2740 SourceLocation IdentLoc, 2741 IdentifierInfo *NamespcName, 2742 AttributeList *AttrList) { 2743 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2744 assert(NamespcName && "Invalid NamespcName."); 2745 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2746 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2747 2748 UsingDirectiveDecl *UDir = 0; 2749 2750 // Lookup namespace name. 2751 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 2752 LookupParsedName(R, S, &SS); 2753 if (R.isAmbiguous()) 2754 return DeclPtrTy(); 2755 2756 if (!R.empty()) { 2757 NamedDecl *NS = R.getFoundDecl(); 2758 // FIXME: Namespace aliases! 2759 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 2760 // C++ [namespace.udir]p1: 2761 // A using-directive specifies that the names in the nominated 2762 // namespace can be used in the scope in which the 2763 // using-directive appears after the using-directive. During 2764 // unqualified name lookup (3.4.1), the names appear as if they 2765 // were declared in the nearest enclosing namespace which 2766 // contains both the using-directive and the nominated 2767 // namespace. [Note: in this context, "contains" means "contains 2768 // directly or indirectly". ] 2769 2770 // Find enclosing context containing both using-directive and 2771 // nominated namespace. 2772 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2773 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2774 CommonAncestor = CommonAncestor->getParent(); 2775 2776 UDir = UsingDirectiveDecl::Create(Context, 2777 CurContext, UsingLoc, 2778 NamespcLoc, 2779 SS.getRange(), 2780 (NestedNameSpecifier *)SS.getScopeRep(), 2781 IdentLoc, 2782 cast<NamespaceDecl>(NS), 2783 CommonAncestor); 2784 PushUsingDirective(S, UDir); 2785 } else { 2786 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2787 } 2788 2789 // FIXME: We ignore attributes for now. 2790 delete AttrList; 2791 return DeclPtrTy::make(UDir); 2792} 2793 2794void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2795 // If scope has associated entity, then using directive is at namespace 2796 // or translation unit scope. We add UsingDirectiveDecls, into 2797 // it's lookup structure. 2798 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2799 Ctx->addDecl(UDir); 2800 else 2801 // Otherwise it is block-sope. using-directives will affect lookup 2802 // only to the end of scope. 2803 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2804} 2805 2806 2807Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2808 AccessSpecifier AS, 2809 SourceLocation UsingLoc, 2810 const CXXScopeSpec &SS, 2811 UnqualifiedId &Name, 2812 AttributeList *AttrList, 2813 bool IsTypeName, 2814 SourceLocation TypenameLoc) { 2815 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2816 2817 switch (Name.getKind()) { 2818 case UnqualifiedId::IK_Identifier: 2819 case UnqualifiedId::IK_OperatorFunctionId: 2820 case UnqualifiedId::IK_ConversionFunctionId: 2821 break; 2822 2823 case UnqualifiedId::IK_ConstructorName: 2824 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 2825 << SS.getRange(); 2826 return DeclPtrTy(); 2827 2828 case UnqualifiedId::IK_DestructorName: 2829 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 2830 << SS.getRange(); 2831 return DeclPtrTy(); 2832 2833 case UnqualifiedId::IK_TemplateId: 2834 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 2835 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 2836 return DeclPtrTy(); 2837 } 2838 2839 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 2840 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 2841 Name.getSourceRange().getBegin(), 2842 TargetName, AttrList, 2843 /* IsInstantiation */ false, 2844 IsTypeName, TypenameLoc); 2845 if (UD) { 2846 PushOnScopeChains(UD, S); 2847 UD->setAccess(AS); 2848 } 2849 2850 return DeclPtrTy::make(UD); 2851} 2852 2853/// Builds a shadow declaration corresponding to a 'using' declaration. 2854static UsingShadowDecl *BuildUsingShadowDecl(Sema &SemaRef, Scope *S, 2855 AccessSpecifier AS, 2856 UsingDecl *UD, NamedDecl *Orig) { 2857 // FIXME: diagnose hiding, collisions 2858 2859 // If we resolved to another shadow declaration, just coalesce them. 2860 if (isa<UsingShadowDecl>(Orig)) { 2861 Orig = cast<UsingShadowDecl>(Orig)->getTargetDecl(); 2862 assert(!isa<UsingShadowDecl>(Orig) && "nested shadow declaration"); 2863 } 2864 2865 UsingShadowDecl *Shadow 2866 = UsingShadowDecl::Create(SemaRef.Context, SemaRef.CurContext, 2867 UD->getLocation(), UD, Orig); 2868 UD->addShadowDecl(Shadow); 2869 2870 if (S) 2871 SemaRef.PushOnScopeChains(Shadow, S); 2872 else 2873 SemaRef.CurContext->addDecl(Shadow); 2874 Shadow->setAccess(AS); 2875 2876 return Shadow; 2877} 2878 2879/// Builds a using declaration. 2880/// 2881/// \param IsInstantiation - Whether this call arises from an 2882/// instantiation of an unresolved using declaration. We treat 2883/// the lookup differently for these declarations. 2884NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 2885 SourceLocation UsingLoc, 2886 const CXXScopeSpec &SS, 2887 SourceLocation IdentLoc, 2888 DeclarationName Name, 2889 AttributeList *AttrList, 2890 bool IsInstantiation, 2891 bool IsTypeName, 2892 SourceLocation TypenameLoc) { 2893 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2894 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2895 2896 // FIXME: We ignore attributes for now. 2897 delete AttrList; 2898 2899 if (SS.isEmpty()) { 2900 Diag(IdentLoc, diag::err_using_requires_qualname); 2901 return 0; 2902 } 2903 2904 NestedNameSpecifier *NNS = 2905 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 2906 2907 DeclContext *LookupContext = computeDeclContext(SS); 2908 if (!LookupContext) { 2909 if (IsTypeName) { 2910 return UnresolvedUsingTypenameDecl::Create(Context, CurContext, 2911 UsingLoc, TypenameLoc, 2912 SS.getRange(), NNS, 2913 IdentLoc, Name); 2914 } else { 2915 return UnresolvedUsingValueDecl::Create(Context, CurContext, 2916 UsingLoc, SS.getRange(), NNS, 2917 IdentLoc, Name); 2918 } 2919 } 2920 2921 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) { 2922 // C++0x N2914 [namespace.udecl]p3: 2923 // A using-declaration used as a member-declaration shall refer to a member 2924 // of a base class of the class being defined, shall refer to a member of an 2925 // anonymous union that is a member of a base class of the class being 2926 // defined, or shall refer to an enumerator for an enumeration type that is 2927 // a member of a base class of the class being defined. 2928 2929 CXXRecordDecl *LookupRD = dyn_cast<CXXRecordDecl>(LookupContext); 2930 if (!LookupRD || !RD->isDerivedFrom(LookupRD)) { 2931 Diag(SS.getRange().getBegin(), 2932 diag::err_using_decl_nested_name_specifier_is_not_a_base_class) 2933 << NNS << RD->getDeclName(); 2934 return 0; 2935 } 2936 } else { 2937 // C++0x N2914 [namespace.udecl]p8: 2938 // A using-declaration for a class member shall be a member-declaration. 2939 if (isa<CXXRecordDecl>(LookupContext)) { 2940 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_class_member) 2941 << SS.getRange(); 2942 return 0; 2943 } 2944 } 2945 2946 // Look up the target name. Unlike most lookups, we do not want to 2947 // hide tag declarations: tag names are visible through the using 2948 // declaration even if hidden by ordinary names. 2949 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 2950 2951 // We don't hide tags behind ordinary decls if we're in a 2952 // non-dependent context, but in a dependent context, this is 2953 // important for the stability of two-phase lookup. 2954 if (!IsInstantiation) 2955 R.setHideTags(false); 2956 2957 LookupQualifiedName(R, LookupContext); 2958 2959 if (R.empty()) { 2960 Diag(IdentLoc, diag::err_no_member) 2961 << Name << LookupContext << SS.getRange(); 2962 return 0; 2963 } 2964 2965 if (R.isAmbiguous()) 2966 return 0; 2967 2968 if (IsTypeName) { 2969 // If we asked for a typename and got a non-type decl, error out. 2970 if (R.getResultKind() != LookupResult::Found 2971 || !isa<TypeDecl>(R.getFoundDecl())) { 2972 Diag(IdentLoc, diag::err_using_typename_non_type); 2973 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 2974 Diag((*I)->getUnderlyingDecl()->getLocation(), 2975 diag::note_using_decl_target); 2976 return 0; 2977 } 2978 } else { 2979 // If we asked for a non-typename and we got a type, error out, 2980 // but only if this is an instantiation of an unresolved using 2981 // decl. Otherwise just silently find the type name. 2982 if (IsInstantiation && 2983 R.getResultKind() == LookupResult::Found && 2984 isa<TypeDecl>(R.getFoundDecl())) { 2985 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 2986 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 2987 return 0; 2988 } 2989 } 2990 2991 // C++0x N2914 [namespace.udecl]p6: 2992 // A using-declaration shall not name a namespace. 2993 if (R.getResultKind() == LookupResult::Found 2994 && isa<NamespaceDecl>(R.getFoundDecl())) { 2995 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 2996 << SS.getRange(); 2997 return 0; 2998 } 2999 3000 UsingDecl *UD = UsingDecl::Create(Context, CurContext, IdentLoc, 3001 SS.getRange(), UsingLoc, NNS, Name, 3002 IsTypeName); 3003 3004 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3005 BuildUsingShadowDecl(*this, S, AS, UD, *I); 3006 3007 return UD; 3008} 3009 3010/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 3011/// is a namespace alias, returns the namespace it points to. 3012static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 3013 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 3014 return AD->getNamespace(); 3015 return dyn_cast_or_null<NamespaceDecl>(D); 3016} 3017 3018Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3019 SourceLocation NamespaceLoc, 3020 SourceLocation AliasLoc, 3021 IdentifierInfo *Alias, 3022 const CXXScopeSpec &SS, 3023 SourceLocation IdentLoc, 3024 IdentifierInfo *Ident) { 3025 3026 // Lookup the namespace name. 3027 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3028 LookupParsedName(R, S, &SS); 3029 3030 // Check if we have a previous declaration with the same name. 3031 if (NamedDecl *PrevDecl 3032 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3033 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3034 // We already have an alias with the same name that points to the same 3035 // namespace, so don't create a new one. 3036 if (!R.isAmbiguous() && !R.empty() && 3037 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 3038 return DeclPtrTy(); 3039 } 3040 3041 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3042 diag::err_redefinition_different_kind; 3043 Diag(AliasLoc, DiagID) << Alias; 3044 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3045 return DeclPtrTy(); 3046 } 3047 3048 if (R.isAmbiguous()) 3049 return DeclPtrTy(); 3050 3051 if (R.empty()) { 3052 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3053 return DeclPtrTy(); 3054 } 3055 3056 NamespaceAliasDecl *AliasDecl = 3057 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3058 Alias, SS.getRange(), 3059 (NestedNameSpecifier *)SS.getScopeRep(), 3060 IdentLoc, R.getFoundDecl()); 3061 3062 CurContext->addDecl(AliasDecl); 3063 return DeclPtrTy::make(AliasDecl); 3064} 3065 3066void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3067 CXXConstructorDecl *Constructor) { 3068 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3069 !Constructor->isUsed()) && 3070 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3071 3072 CXXRecordDecl *ClassDecl 3073 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3074 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3075 3076 if (SetBaseOrMemberInitializers(Constructor, 0, 0, true)) { 3077 Diag(CurrentLocation, diag::note_ctor_synthesized_at) 3078 << Context.getTagDeclType(ClassDecl); 3079 Constructor->setInvalidDecl(); 3080 } else { 3081 Constructor->setUsed(); 3082 } 3083 return; 3084} 3085 3086void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3087 CXXDestructorDecl *Destructor) { 3088 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3089 "DefineImplicitDestructor - call it for implicit default dtor"); 3090 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3091 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3092 // C++ [class.dtor] p5 3093 // Before the implicitly-declared default destructor for a class is 3094 // implicitly defined, all the implicitly-declared default destructors 3095 // for its base class and its non-static data members shall have been 3096 // implicitly defined. 3097 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3098 E = ClassDecl->bases_end(); Base != E; ++Base) { 3099 CXXRecordDecl *BaseClassDecl 3100 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3101 if (!BaseClassDecl->hasTrivialDestructor()) { 3102 if (CXXDestructorDecl *BaseDtor = 3103 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 3104 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 3105 else 3106 assert(false && 3107 "DefineImplicitDestructor - missing dtor in a base class"); 3108 } 3109 } 3110 3111 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3112 E = ClassDecl->field_end(); Field != E; ++Field) { 3113 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3114 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3115 FieldType = Array->getElementType(); 3116 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3117 CXXRecordDecl *FieldClassDecl 3118 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3119 if (!FieldClassDecl->hasTrivialDestructor()) { 3120 if (CXXDestructorDecl *FieldDtor = 3121 const_cast<CXXDestructorDecl*>( 3122 FieldClassDecl->getDestructor(Context))) 3123 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 3124 else 3125 assert(false && 3126 "DefineImplicitDestructor - missing dtor in class of a data member"); 3127 } 3128 } 3129 } 3130 Destructor->setUsed(); 3131} 3132 3133void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3134 CXXMethodDecl *MethodDecl) { 3135 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3136 MethodDecl->getOverloadedOperator() == OO_Equal && 3137 !MethodDecl->isUsed()) && 3138 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3139 3140 CXXRecordDecl *ClassDecl 3141 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3142 3143 // C++[class.copy] p12 3144 // Before the implicitly-declared copy assignment operator for a class is 3145 // implicitly defined, all implicitly-declared copy assignment operators 3146 // for its direct base classes and its nonstatic data members shall have 3147 // been implicitly defined. 3148 bool err = false; 3149 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3150 E = ClassDecl->bases_end(); Base != E; ++Base) { 3151 CXXRecordDecl *BaseClassDecl 3152 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3153 if (CXXMethodDecl *BaseAssignOpMethod = 3154 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 3155 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3156 } 3157 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3158 E = ClassDecl->field_end(); Field != E; ++Field) { 3159 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3160 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3161 FieldType = Array->getElementType(); 3162 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3163 CXXRecordDecl *FieldClassDecl 3164 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3165 if (CXXMethodDecl *FieldAssignOpMethod = 3166 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 3167 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3168 } else if (FieldType->isReferenceType()) { 3169 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3170 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3171 Diag(Field->getLocation(), diag::note_declared_at); 3172 Diag(CurrentLocation, diag::note_first_required_here); 3173 err = true; 3174 } else if (FieldType.isConstQualified()) { 3175 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3176 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3177 Diag(Field->getLocation(), diag::note_declared_at); 3178 Diag(CurrentLocation, diag::note_first_required_here); 3179 err = true; 3180 } 3181 } 3182 if (!err) 3183 MethodDecl->setUsed(); 3184} 3185 3186CXXMethodDecl * 3187Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 3188 CXXRecordDecl *ClassDecl) { 3189 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3190 QualType RHSType(LHSType); 3191 // If class's assignment operator argument is const/volatile qualified, 3192 // look for operator = (const/volatile B&). Otherwise, look for 3193 // operator = (B&). 3194 RHSType = Context.getCVRQualifiedType(RHSType, 3195 ParmDecl->getType().getCVRQualifiers()); 3196 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3197 LHSType, 3198 SourceLocation())); 3199 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3200 RHSType, 3201 SourceLocation())); 3202 Expr *Args[2] = { &*LHS, &*RHS }; 3203 OverloadCandidateSet CandidateSet; 3204 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3205 CandidateSet); 3206 OverloadCandidateSet::iterator Best; 3207 if (BestViableFunction(CandidateSet, 3208 ClassDecl->getLocation(), Best) == OR_Success) 3209 return cast<CXXMethodDecl>(Best->Function); 3210 assert(false && 3211 "getAssignOperatorMethod - copy assignment operator method not found"); 3212 return 0; 3213} 3214 3215void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3216 CXXConstructorDecl *CopyConstructor, 3217 unsigned TypeQuals) { 3218 assert((CopyConstructor->isImplicit() && 3219 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 3220 !CopyConstructor->isUsed()) && 3221 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3222 3223 CXXRecordDecl *ClassDecl 3224 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3225 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3226 // C++ [class.copy] p209 3227 // Before the implicitly-declared copy constructor for a class is 3228 // implicitly defined, all the implicitly-declared copy constructors 3229 // for its base class and its non-static data members shall have been 3230 // implicitly defined. 3231 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3232 Base != ClassDecl->bases_end(); ++Base) { 3233 CXXRecordDecl *BaseClassDecl 3234 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3235 if (CXXConstructorDecl *BaseCopyCtor = 3236 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 3237 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3238 } 3239 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3240 FieldEnd = ClassDecl->field_end(); 3241 Field != FieldEnd; ++Field) { 3242 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3243 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3244 FieldType = Array->getElementType(); 3245 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3246 CXXRecordDecl *FieldClassDecl 3247 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3248 if (CXXConstructorDecl *FieldCopyCtor = 3249 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 3250 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3251 } 3252 } 3253 CopyConstructor->setUsed(); 3254} 3255 3256Sema::OwningExprResult 3257Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3258 CXXConstructorDecl *Constructor, 3259 MultiExprArg ExprArgs) { 3260 bool Elidable = false; 3261 3262 // C++ [class.copy]p15: 3263 // Whenever a temporary class object is copied using a copy constructor, and 3264 // this object and the copy have the same cv-unqualified type, an 3265 // implementation is permitted to treat the original and the copy as two 3266 // different ways of referring to the same object and not perform a copy at 3267 // all, even if the class copy constructor or destructor have side effects. 3268 3269 // FIXME: Is this enough? 3270 if (Constructor->isCopyConstructor(Context)) { 3271 Expr *E = ((Expr **)ExprArgs.get())[0]; 3272 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3273 E = BE->getSubExpr(); 3274 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3275 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3276 E = ICE->getSubExpr(); 3277 3278 if (isa<CallExpr>(E) || isa<CXXTemporaryObjectExpr>(E)) 3279 Elidable = true; 3280 } 3281 3282 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 3283 Elidable, move(ExprArgs)); 3284} 3285 3286/// BuildCXXConstructExpr - Creates a complete call to a constructor, 3287/// including handling of its default argument expressions. 3288Sema::OwningExprResult 3289Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3290 CXXConstructorDecl *Constructor, bool Elidable, 3291 MultiExprArg ExprArgs) { 3292 unsigned NumExprs = ExprArgs.size(); 3293 Expr **Exprs = (Expr **)ExprArgs.release(); 3294 3295 return Owned(CXXConstructExpr::Create(Context, DeclInitType, Constructor, 3296 Elidable, Exprs, NumExprs)); 3297} 3298 3299Sema::OwningExprResult 3300Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor, 3301 QualType Ty, 3302 SourceLocation TyBeginLoc, 3303 MultiExprArg Args, 3304 SourceLocation RParenLoc) { 3305 unsigned NumExprs = Args.size(); 3306 Expr **Exprs = (Expr **)Args.release(); 3307 3308 return Owned(new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty, 3309 TyBeginLoc, Exprs, 3310 NumExprs, RParenLoc)); 3311} 3312 3313 3314bool Sema::InitializeVarWithConstructor(VarDecl *VD, 3315 CXXConstructorDecl *Constructor, 3316 MultiExprArg Exprs) { 3317 OwningExprResult TempResult = 3318 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 3319 move(Exprs)); 3320 if (TempResult.isInvalid()) 3321 return true; 3322 3323 Expr *Temp = TempResult.takeAs<Expr>(); 3324 MarkDeclarationReferenced(VD->getLocation(), Constructor); 3325 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 3326 VD->setInit(Context, Temp); 3327 3328 return false; 3329} 3330 3331void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) { 3332 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 3333 DeclInitType->getAs<RecordType>()->getDecl()); 3334 if (!ClassDecl->hasTrivialDestructor()) 3335 if (CXXDestructorDecl *Destructor = 3336 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 3337 MarkDeclarationReferenced(VD->getLocation(), Destructor); 3338} 3339 3340/// AddCXXDirectInitializerToDecl - This action is called immediately after 3341/// ActOnDeclarator, when a C++ direct initializer is present. 3342/// e.g: "int x(1);" 3343void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 3344 SourceLocation LParenLoc, 3345 MultiExprArg Exprs, 3346 SourceLocation *CommaLocs, 3347 SourceLocation RParenLoc) { 3348 unsigned NumExprs = Exprs.size(); 3349 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 3350 Decl *RealDecl = Dcl.getAs<Decl>(); 3351 3352 // If there is no declaration, there was an error parsing it. Just ignore 3353 // the initializer. 3354 if (RealDecl == 0) 3355 return; 3356 3357 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3358 if (!VDecl) { 3359 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3360 RealDecl->setInvalidDecl(); 3361 return; 3362 } 3363 3364 // We will represent direct-initialization similarly to copy-initialization: 3365 // int x(1); -as-> int x = 1; 3366 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 3367 // 3368 // Clients that want to distinguish between the two forms, can check for 3369 // direct initializer using VarDecl::hasCXXDirectInitializer(). 3370 // A major benefit is that clients that don't particularly care about which 3371 // exactly form was it (like the CodeGen) can handle both cases without 3372 // special case code. 3373 3374 // If either the declaration has a dependent type or if any of the expressions 3375 // is type-dependent, we represent the initialization via a ParenListExpr for 3376 // later use during template instantiation. 3377 if (VDecl->getType()->isDependentType() || 3378 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 3379 // Let clients know that initialization was done with a direct initializer. 3380 VDecl->setCXXDirectInitializer(true); 3381 3382 // Store the initialization expressions as a ParenListExpr. 3383 unsigned NumExprs = Exprs.size(); 3384 VDecl->setInit(Context, 3385 new (Context) ParenListExpr(Context, LParenLoc, 3386 (Expr **)Exprs.release(), 3387 NumExprs, RParenLoc)); 3388 return; 3389 } 3390 3391 3392 // C++ 8.5p11: 3393 // The form of initialization (using parentheses or '=') is generally 3394 // insignificant, but does matter when the entity being initialized has a 3395 // class type. 3396 QualType DeclInitType = VDecl->getType(); 3397 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 3398 DeclInitType = Context.getBaseElementType(Array); 3399 3400 // FIXME: This isn't the right place to complete the type. 3401 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 3402 diag::err_typecheck_decl_incomplete_type)) { 3403 VDecl->setInvalidDecl(); 3404 return; 3405 } 3406 3407 if (VDecl->getType()->isRecordType()) { 3408 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 3409 3410 CXXConstructorDecl *Constructor 3411 = PerformInitializationByConstructor(DeclInitType, 3412 move(Exprs), 3413 VDecl->getLocation(), 3414 SourceRange(VDecl->getLocation(), 3415 RParenLoc), 3416 VDecl->getDeclName(), 3417 IK_Direct, 3418 ConstructorArgs); 3419 if (!Constructor) 3420 RealDecl->setInvalidDecl(); 3421 else { 3422 VDecl->setCXXDirectInitializer(true); 3423 if (InitializeVarWithConstructor(VDecl, Constructor, 3424 move_arg(ConstructorArgs))) 3425 RealDecl->setInvalidDecl(); 3426 FinalizeVarWithDestructor(VDecl, DeclInitType); 3427 } 3428 return; 3429 } 3430 3431 if (NumExprs > 1) { 3432 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 3433 << SourceRange(VDecl->getLocation(), RParenLoc); 3434 RealDecl->setInvalidDecl(); 3435 return; 3436 } 3437 3438 // Let clients know that initialization was done with a direct initializer. 3439 VDecl->setCXXDirectInitializer(true); 3440 3441 assert(NumExprs == 1 && "Expected 1 expression"); 3442 // Set the init expression, handles conversions. 3443 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 3444 /*DirectInit=*/true); 3445} 3446 3447/// \brief Add the applicable constructor candidates for an initialization 3448/// by constructor. 3449static void AddConstructorInitializationCandidates(Sema &SemaRef, 3450 QualType ClassType, 3451 Expr **Args, 3452 unsigned NumArgs, 3453 Sema::InitializationKind Kind, 3454 OverloadCandidateSet &CandidateSet) { 3455 // C++ [dcl.init]p14: 3456 // If the initialization is direct-initialization, or if it is 3457 // copy-initialization where the cv-unqualified version of the 3458 // source type is the same class as, or a derived class of, the 3459 // class of the destination, constructors are considered. The 3460 // applicable constructors are enumerated (13.3.1.3), and the 3461 // best one is chosen through overload resolution (13.3). The 3462 // constructor so selected is called to initialize the object, 3463 // with the initializer expression(s) as its argument(s). If no 3464 // constructor applies, or the overload resolution is ambiguous, 3465 // the initialization is ill-formed. 3466 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 3467 assert(ClassRec && "Can only initialize a class type here"); 3468 3469 // FIXME: When we decide not to synthesize the implicitly-declared 3470 // constructors, we'll need to make them appear here. 3471 3472 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 3473 DeclarationName ConstructorName 3474 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 3475 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 3476 DeclContext::lookup_const_iterator Con, ConEnd; 3477 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 3478 Con != ConEnd; ++Con) { 3479 // Find the constructor (which may be a template). 3480 CXXConstructorDecl *Constructor = 0; 3481 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 3482 if (ConstructorTmpl) 3483 Constructor 3484 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 3485 else 3486 Constructor = cast<CXXConstructorDecl>(*Con); 3487 3488 if ((Kind == Sema::IK_Direct) || 3489 (Kind == Sema::IK_Copy && 3490 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 3491 (Kind == Sema::IK_Default && Constructor->isDefaultConstructor())) { 3492 if (ConstructorTmpl) 3493 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, false, 0, 0, 3494 Args, NumArgs, CandidateSet); 3495 else 3496 SemaRef.AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 3497 } 3498 } 3499} 3500 3501/// \brief Attempt to perform initialization by constructor 3502/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 3503/// copy-initialization. 3504/// 3505/// This routine determines whether initialization by constructor is possible, 3506/// but it does not emit any diagnostics in the case where the initialization 3507/// is ill-formed. 3508/// 3509/// \param ClassType the type of the object being initialized, which must have 3510/// class type. 3511/// 3512/// \param Args the arguments provided to initialize the object 3513/// 3514/// \param NumArgs the number of arguments provided to initialize the object 3515/// 3516/// \param Kind the type of initialization being performed 3517/// 3518/// \returns the constructor used to initialize the object, if successful. 3519/// Otherwise, emits a diagnostic and returns NULL. 3520CXXConstructorDecl * 3521Sema::TryInitializationByConstructor(QualType ClassType, 3522 Expr **Args, unsigned NumArgs, 3523 SourceLocation Loc, 3524 InitializationKind Kind) { 3525 // Build the overload candidate set 3526 OverloadCandidateSet CandidateSet; 3527 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 3528 CandidateSet); 3529 3530 // Determine whether we found a constructor we can use. 3531 OverloadCandidateSet::iterator Best; 3532 switch (BestViableFunction(CandidateSet, Loc, Best)) { 3533 case OR_Success: 3534 case OR_Deleted: 3535 // We found a constructor. Return it. 3536 return cast<CXXConstructorDecl>(Best->Function); 3537 3538 case OR_No_Viable_Function: 3539 case OR_Ambiguous: 3540 // Overload resolution failed. Return nothing. 3541 return 0; 3542 } 3543 3544 // Silence GCC warning 3545 return 0; 3546} 3547 3548/// \brief Perform initialization by constructor (C++ [dcl.init]p14), which 3549/// may occur as part of direct-initialization or copy-initialization. 3550/// 3551/// \param ClassType the type of the object being initialized, which must have 3552/// class type. 3553/// 3554/// \param ArgsPtr the arguments provided to initialize the object 3555/// 3556/// \param Loc the source location where the initialization occurs 3557/// 3558/// \param Range the source range that covers the entire initialization 3559/// 3560/// \param InitEntity the name of the entity being initialized, if known 3561/// 3562/// \param Kind the type of initialization being performed 3563/// 3564/// \param ConvertedArgs a vector that will be filled in with the 3565/// appropriately-converted arguments to the constructor (if initialization 3566/// succeeded). 3567/// 3568/// \returns the constructor used to initialize the object, if successful. 3569/// Otherwise, emits a diagnostic and returns NULL. 3570CXXConstructorDecl * 3571Sema::PerformInitializationByConstructor(QualType ClassType, 3572 MultiExprArg ArgsPtr, 3573 SourceLocation Loc, SourceRange Range, 3574 DeclarationName InitEntity, 3575 InitializationKind Kind, 3576 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3577 3578 // Build the overload candidate set 3579 Expr **Args = (Expr **)ArgsPtr.get(); 3580 unsigned NumArgs = ArgsPtr.size(); 3581 OverloadCandidateSet CandidateSet; 3582 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 3583 CandidateSet); 3584 3585 OverloadCandidateSet::iterator Best; 3586 switch (BestViableFunction(CandidateSet, Loc, Best)) { 3587 case OR_Success: 3588 // We found a constructor. Break out so that we can convert the arguments 3589 // appropriately. 3590 break; 3591 3592 case OR_No_Viable_Function: 3593 if (InitEntity) 3594 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3595 << InitEntity << Range; 3596 else 3597 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3598 << ClassType << Range; 3599 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 3600 return 0; 3601 3602 case OR_Ambiguous: 3603 if (InitEntity) 3604 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 3605 else 3606 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 3607 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3608 return 0; 3609 3610 case OR_Deleted: 3611 if (InitEntity) 3612 Diag(Loc, diag::err_ovl_deleted_init) 3613 << Best->Function->isDeleted() 3614 << InitEntity << Range; 3615 else 3616 Diag(Loc, diag::err_ovl_deleted_init) 3617 << Best->Function->isDeleted() 3618 << InitEntity << Range; 3619 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3620 return 0; 3621 } 3622 3623 // Convert the arguments, fill in default arguments, etc. 3624 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function); 3625 if (CompleteConstructorCall(Constructor, move(ArgsPtr), Loc, ConvertedArgs)) 3626 return 0; 3627 3628 return Constructor; 3629} 3630 3631/// \brief Given a constructor and the set of arguments provided for the 3632/// constructor, convert the arguments and add any required default arguments 3633/// to form a proper call to this constructor. 3634/// 3635/// \returns true if an error occurred, false otherwise. 3636bool 3637Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 3638 MultiExprArg ArgsPtr, 3639 SourceLocation Loc, 3640 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3641 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 3642 unsigned NumArgs = ArgsPtr.size(); 3643 Expr **Args = (Expr **)ArgsPtr.get(); 3644 3645 const FunctionProtoType *Proto 3646 = Constructor->getType()->getAs<FunctionProtoType>(); 3647 assert(Proto && "Constructor without a prototype?"); 3648 unsigned NumArgsInProto = Proto->getNumArgs(); 3649 unsigned NumArgsToCheck = NumArgs; 3650 3651 // If too few arguments are available, we'll fill in the rest with defaults. 3652 if (NumArgs < NumArgsInProto) { 3653 NumArgsToCheck = NumArgsInProto; 3654 ConvertedArgs.reserve(NumArgsInProto); 3655 } else { 3656 ConvertedArgs.reserve(NumArgs); 3657 if (NumArgs > NumArgsInProto) 3658 NumArgsToCheck = NumArgsInProto; 3659 } 3660 3661 // Convert arguments 3662 for (unsigned i = 0; i != NumArgsToCheck; i++) { 3663 QualType ProtoArgType = Proto->getArgType(i); 3664 3665 Expr *Arg; 3666 if (i < NumArgs) { 3667 Arg = Args[i]; 3668 3669 // Pass the argument. 3670 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 3671 return true; 3672 3673 Args[i] = 0; 3674 } else { 3675 ParmVarDecl *Param = Constructor->getParamDecl(i); 3676 3677 OwningExprResult DefArg = BuildCXXDefaultArgExpr(Loc, Constructor, Param); 3678 if (DefArg.isInvalid()) 3679 return true; 3680 3681 Arg = DefArg.takeAs<Expr>(); 3682 } 3683 3684 ConvertedArgs.push_back(Arg); 3685 } 3686 3687 // If this is a variadic call, handle args passed through "...". 3688 if (Proto->isVariadic()) { 3689 // Promote the arguments (C99 6.5.2.2p7). 3690 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 3691 Expr *Arg = Args[i]; 3692 if (DefaultVariadicArgumentPromotion(Arg, VariadicConstructor)) 3693 return true; 3694 3695 ConvertedArgs.push_back(Arg); 3696 Args[i] = 0; 3697 } 3698 } 3699 3700 return false; 3701} 3702 3703/// CompareReferenceRelationship - Compare the two types T1 and T2 to 3704/// determine whether they are reference-related, 3705/// reference-compatible, reference-compatible with added 3706/// qualification, or incompatible, for use in C++ initialization by 3707/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 3708/// type, and the first type (T1) is the pointee type of the reference 3709/// type being initialized. 3710Sema::ReferenceCompareResult 3711Sema::CompareReferenceRelationship(SourceLocation Loc, 3712 QualType OrigT1, QualType OrigT2, 3713 bool& DerivedToBase) { 3714 assert(!OrigT1->isReferenceType() && 3715 "T1 must be the pointee type of the reference type"); 3716 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 3717 3718 QualType T1 = Context.getCanonicalType(OrigT1); 3719 QualType T2 = Context.getCanonicalType(OrigT2); 3720 QualType UnqualT1 = T1.getLocalUnqualifiedType(); 3721 QualType UnqualT2 = T2.getLocalUnqualifiedType(); 3722 3723 // C++ [dcl.init.ref]p4: 3724 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 3725 // reference-related to "cv2 T2" if T1 is the same type as T2, or 3726 // T1 is a base class of T2. 3727 if (UnqualT1 == UnqualT2) 3728 DerivedToBase = false; 3729 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 3730 !RequireCompleteType(Loc, OrigT2, PDiag()) && 3731 IsDerivedFrom(UnqualT2, UnqualT1)) 3732 DerivedToBase = true; 3733 else 3734 return Ref_Incompatible; 3735 3736 // At this point, we know that T1 and T2 are reference-related (at 3737 // least). 3738 3739 // C++ [dcl.init.ref]p4: 3740 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 3741 // reference-related to T2 and cv1 is the same cv-qualification 3742 // as, or greater cv-qualification than, cv2. For purposes of 3743 // overload resolution, cases for which cv1 is greater 3744 // cv-qualification than cv2 are identified as 3745 // reference-compatible with added qualification (see 13.3.3.2). 3746 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 3747 return Ref_Compatible; 3748 else if (T1.isMoreQualifiedThan(T2)) 3749 return Ref_Compatible_With_Added_Qualification; 3750 else 3751 return Ref_Related; 3752} 3753 3754/// CheckReferenceInit - Check the initialization of a reference 3755/// variable with the given initializer (C++ [dcl.init.ref]). Init is 3756/// the initializer (either a simple initializer or an initializer 3757/// list), and DeclType is the type of the declaration. When ICS is 3758/// non-null, this routine will compute the implicit conversion 3759/// sequence according to C++ [over.ics.ref] and will not produce any 3760/// diagnostics; when ICS is null, it will emit diagnostics when any 3761/// errors are found. Either way, a return value of true indicates 3762/// that there was a failure, a return value of false indicates that 3763/// the reference initialization succeeded. 3764/// 3765/// When @p SuppressUserConversions, user-defined conversions are 3766/// suppressed. 3767/// When @p AllowExplicit, we also permit explicit user-defined 3768/// conversion functions. 3769/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 3770/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 3771/// This is used when this is called from a C-style cast. 3772bool 3773Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 3774 SourceLocation DeclLoc, 3775 bool SuppressUserConversions, 3776 bool AllowExplicit, bool ForceRValue, 3777 ImplicitConversionSequence *ICS, 3778 bool IgnoreBaseAccess) { 3779 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 3780 3781 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 3782 QualType T2 = Init->getType(); 3783 3784 // If the initializer is the address of an overloaded function, try 3785 // to resolve the overloaded function. If all goes well, T2 is the 3786 // type of the resulting function. 3787 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 3788 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 3789 ICS != 0); 3790 if (Fn) { 3791 // Since we're performing this reference-initialization for 3792 // real, update the initializer with the resulting function. 3793 if (!ICS) { 3794 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 3795 return true; 3796 3797 Init = FixOverloadedFunctionReference(Init, Fn); 3798 } 3799 3800 T2 = Fn->getType(); 3801 } 3802 } 3803 3804 // Compute some basic properties of the types and the initializer. 3805 bool isRValRef = DeclType->isRValueReferenceType(); 3806 bool DerivedToBase = false; 3807 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 3808 Init->isLvalue(Context); 3809 ReferenceCompareResult RefRelationship 3810 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 3811 3812 // Most paths end in a failed conversion. 3813 if (ICS) 3814 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 3815 3816 // C++ [dcl.init.ref]p5: 3817 // A reference to type "cv1 T1" is initialized by an expression 3818 // of type "cv2 T2" as follows: 3819 3820 // -- If the initializer expression 3821 3822 // Rvalue references cannot bind to lvalues (N2812). 3823 // There is absolutely no situation where they can. In particular, note that 3824 // this is ill-formed, even if B has a user-defined conversion to A&&: 3825 // B b; 3826 // A&& r = b; 3827 if (isRValRef && InitLvalue == Expr::LV_Valid) { 3828 if (!ICS) 3829 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 3830 << Init->getSourceRange(); 3831 return true; 3832 } 3833 3834 bool BindsDirectly = false; 3835 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 3836 // reference-compatible with "cv2 T2," or 3837 // 3838 // Note that the bit-field check is skipped if we are just computing 3839 // the implicit conversion sequence (C++ [over.best.ics]p2). 3840 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 3841 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 3842 BindsDirectly = true; 3843 3844 if (ICS) { 3845 // C++ [over.ics.ref]p1: 3846 // When a parameter of reference type binds directly (8.5.3) 3847 // to an argument expression, the implicit conversion sequence 3848 // is the identity conversion, unless the argument expression 3849 // has a type that is a derived class of the parameter type, 3850 // in which case the implicit conversion sequence is a 3851 // derived-to-base Conversion (13.3.3.1). 3852 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 3853 ICS->Standard.First = ICK_Identity; 3854 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3855 ICS->Standard.Third = ICK_Identity; 3856 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3857 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3858 ICS->Standard.ReferenceBinding = true; 3859 ICS->Standard.DirectBinding = true; 3860 ICS->Standard.RRefBinding = false; 3861 ICS->Standard.CopyConstructor = 0; 3862 3863 // Nothing more to do: the inaccessibility/ambiguity check for 3864 // derived-to-base conversions is suppressed when we're 3865 // computing the implicit conversion sequence (C++ 3866 // [over.best.ics]p2). 3867 return false; 3868 } else { 3869 // Perform the conversion. 3870 CastExpr::CastKind CK = CastExpr::CK_NoOp; 3871 if (DerivedToBase) 3872 CK = CastExpr::CK_DerivedToBase; 3873 else if(CheckExceptionSpecCompatibility(Init, T1)) 3874 return true; 3875 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 3876 } 3877 } 3878 3879 // -- has a class type (i.e., T2 is a class type) and can be 3880 // implicitly converted to an lvalue of type "cv3 T3," 3881 // where "cv1 T1" is reference-compatible with "cv3 T3" 3882 // 92) (this conversion is selected by enumerating the 3883 // applicable conversion functions (13.3.1.6) and choosing 3884 // the best one through overload resolution (13.3)), 3885 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 3886 !RequireCompleteType(DeclLoc, T2, 0)) { 3887 CXXRecordDecl *T2RecordDecl 3888 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 3889 3890 OverloadCandidateSet CandidateSet; 3891 OverloadedFunctionDecl *Conversions 3892 = T2RecordDecl->getVisibleConversionFunctions(); 3893 for (OverloadedFunctionDecl::function_iterator Func 3894 = Conversions->function_begin(); 3895 Func != Conversions->function_end(); ++Func) { 3896 FunctionTemplateDecl *ConvTemplate 3897 = dyn_cast<FunctionTemplateDecl>(*Func); 3898 CXXConversionDecl *Conv; 3899 if (ConvTemplate) 3900 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 3901 else 3902 Conv = cast<CXXConversionDecl>(*Func); 3903 3904 // If the conversion function doesn't return a reference type, 3905 // it can't be considered for this conversion. 3906 if (Conv->getConversionType()->isLValueReferenceType() && 3907 (AllowExplicit || !Conv->isExplicit())) { 3908 if (ConvTemplate) 3909 AddTemplateConversionCandidate(ConvTemplate, Init, DeclType, 3910 CandidateSet); 3911 else 3912 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 3913 } 3914 } 3915 3916 OverloadCandidateSet::iterator Best; 3917 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 3918 case OR_Success: 3919 // This is a direct binding. 3920 BindsDirectly = true; 3921 3922 if (ICS) { 3923 // C++ [over.ics.ref]p1: 3924 // 3925 // [...] If the parameter binds directly to the result of 3926 // applying a conversion function to the argument 3927 // expression, the implicit conversion sequence is a 3928 // user-defined conversion sequence (13.3.3.1.2), with the 3929 // second standard conversion sequence either an identity 3930 // conversion or, if the conversion function returns an 3931 // entity of a type that is a derived class of the parameter 3932 // type, a derived-to-base Conversion. 3933 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 3934 ICS->UserDefined.Before = Best->Conversions[0].Standard; 3935 ICS->UserDefined.After = Best->FinalConversion; 3936 ICS->UserDefined.ConversionFunction = Best->Function; 3937 ICS->UserDefined.EllipsisConversion = false; 3938 assert(ICS->UserDefined.After.ReferenceBinding && 3939 ICS->UserDefined.After.DirectBinding && 3940 "Expected a direct reference binding!"); 3941 return false; 3942 } else { 3943 OwningExprResult InitConversion = 3944 BuildCXXCastArgument(DeclLoc, QualType(), 3945 CastExpr::CK_UserDefinedConversion, 3946 cast<CXXMethodDecl>(Best->Function), 3947 Owned(Init)); 3948 Init = InitConversion.takeAs<Expr>(); 3949 3950 if (CheckExceptionSpecCompatibility(Init, T1)) 3951 return true; 3952 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 3953 /*isLvalue=*/true); 3954 } 3955 break; 3956 3957 case OR_Ambiguous: 3958 if (ICS) { 3959 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 3960 Cand != CandidateSet.end(); ++Cand) 3961 if (Cand->Viable) 3962 ICS->ConversionFunctionSet.push_back(Cand->Function); 3963 break; 3964 } 3965 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 3966 << Init->getSourceRange(); 3967 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3968 return true; 3969 3970 case OR_No_Viable_Function: 3971 case OR_Deleted: 3972 // There was no suitable conversion, or we found a deleted 3973 // conversion; continue with other checks. 3974 break; 3975 } 3976 } 3977 3978 if (BindsDirectly) { 3979 // C++ [dcl.init.ref]p4: 3980 // [...] In all cases where the reference-related or 3981 // reference-compatible relationship of two types is used to 3982 // establish the validity of a reference binding, and T1 is a 3983 // base class of T2, a program that necessitates such a binding 3984 // is ill-formed if T1 is an inaccessible (clause 11) or 3985 // ambiguous (10.2) base class of T2. 3986 // 3987 // Note that we only check this condition when we're allowed to 3988 // complain about errors, because we should not be checking for 3989 // ambiguity (or inaccessibility) unless the reference binding 3990 // actually happens. 3991 if (DerivedToBase) 3992 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 3993 Init->getSourceRange(), 3994 IgnoreBaseAccess); 3995 else 3996 return false; 3997 } 3998 3999 // -- Otherwise, the reference shall be to a non-volatile const 4000 // type (i.e., cv1 shall be const), or the reference shall be an 4001 // rvalue reference and the initializer expression shall be an rvalue. 4002 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 4003 if (!ICS) 4004 Diag(DeclLoc, diag::err_not_reference_to_const_init) 4005 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 4006 << T2 << Init->getSourceRange(); 4007 return true; 4008 } 4009 4010 // -- If the initializer expression is an rvalue, with T2 a 4011 // class type, and "cv1 T1" is reference-compatible with 4012 // "cv2 T2," the reference is bound in one of the 4013 // following ways (the choice is implementation-defined): 4014 // 4015 // -- The reference is bound to the object represented by 4016 // the rvalue (see 3.10) or to a sub-object within that 4017 // object. 4018 // 4019 // -- A temporary of type "cv1 T2" [sic] is created, and 4020 // a constructor is called to copy the entire rvalue 4021 // object into the temporary. The reference is bound to 4022 // the temporary or to a sub-object within the 4023 // temporary. 4024 // 4025 // The constructor that would be used to make the copy 4026 // shall be callable whether or not the copy is actually 4027 // done. 4028 // 4029 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 4030 // freedom, so we will always take the first option and never build 4031 // a temporary in this case. FIXME: We will, however, have to check 4032 // for the presence of a copy constructor in C++98/03 mode. 4033 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 4034 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4035 if (ICS) { 4036 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 4037 ICS->Standard.First = ICK_Identity; 4038 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4039 ICS->Standard.Third = ICK_Identity; 4040 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4041 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 4042 ICS->Standard.ReferenceBinding = true; 4043 ICS->Standard.DirectBinding = false; 4044 ICS->Standard.RRefBinding = isRValRef; 4045 ICS->Standard.CopyConstructor = 0; 4046 } else { 4047 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4048 if (DerivedToBase) 4049 CK = CastExpr::CK_DerivedToBase; 4050 else if(CheckExceptionSpecCompatibility(Init, T1)) 4051 return true; 4052 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4053 } 4054 return false; 4055 } 4056 4057 // -- Otherwise, a temporary of type "cv1 T1" is created and 4058 // initialized from the initializer expression using the 4059 // rules for a non-reference copy initialization (8.5). The 4060 // reference is then bound to the temporary. If T1 is 4061 // reference-related to T2, cv1 must be the same 4062 // cv-qualification as, or greater cv-qualification than, 4063 // cv2; otherwise, the program is ill-formed. 4064 if (RefRelationship == Ref_Related) { 4065 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4066 // we would be reference-compatible or reference-compatible with 4067 // added qualification. But that wasn't the case, so the reference 4068 // initialization fails. 4069 if (!ICS) 4070 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4071 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 4072 << T2 << Init->getSourceRange(); 4073 return true; 4074 } 4075 4076 // If at least one of the types is a class type, the types are not 4077 // related, and we aren't allowed any user conversions, the 4078 // reference binding fails. This case is important for breaking 4079 // recursion, since TryImplicitConversion below will attempt to 4080 // create a temporary through the use of a copy constructor. 4081 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4082 (T1->isRecordType() || T2->isRecordType())) { 4083 if (!ICS) 4084 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4085 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 4086 return true; 4087 } 4088 4089 // Actually try to convert the initializer to T1. 4090 if (ICS) { 4091 // C++ [over.ics.ref]p2: 4092 // 4093 // When a parameter of reference type is not bound directly to 4094 // an argument expression, the conversion sequence is the one 4095 // required to convert the argument expression to the 4096 // underlying type of the reference according to 4097 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4098 // to copy-initializing a temporary of the underlying type with 4099 // the argument expression. Any difference in top-level 4100 // cv-qualification is subsumed by the initialization itself 4101 // and does not constitute a conversion. 4102 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4103 /*AllowExplicit=*/false, 4104 /*ForceRValue=*/false, 4105 /*InOverloadResolution=*/false); 4106 4107 // Of course, that's still a reference binding. 4108 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 4109 ICS->Standard.ReferenceBinding = true; 4110 ICS->Standard.RRefBinding = isRValRef; 4111 } else if (ICS->ConversionKind == 4112 ImplicitConversionSequence::UserDefinedConversion) { 4113 ICS->UserDefined.After.ReferenceBinding = true; 4114 ICS->UserDefined.After.RRefBinding = isRValRef; 4115 } 4116 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 4117 } else { 4118 ImplicitConversionSequence Conversions; 4119 bool badConversion = PerformImplicitConversion(Init, T1, "initializing", 4120 false, false, 4121 Conversions); 4122 if (badConversion) { 4123 if ((Conversions.ConversionKind == 4124 ImplicitConversionSequence::BadConversion) 4125 && !Conversions.ConversionFunctionSet.empty()) { 4126 Diag(DeclLoc, 4127 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4128 for (int j = Conversions.ConversionFunctionSet.size()-1; 4129 j >= 0; j--) { 4130 FunctionDecl *Func = Conversions.ConversionFunctionSet[j]; 4131 Diag(Func->getLocation(), diag::err_ovl_candidate); 4132 } 4133 } 4134 else { 4135 if (isRValRef) 4136 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4137 << Init->getSourceRange(); 4138 else 4139 Diag(DeclLoc, diag::err_invalid_initialization) 4140 << DeclType << Init->getType() << Init->getSourceRange(); 4141 } 4142 } 4143 return badConversion; 4144 } 4145} 4146 4147/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4148/// of this overloaded operator is well-formed. If so, returns false; 4149/// otherwise, emits appropriate diagnostics and returns true. 4150bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4151 assert(FnDecl && FnDecl->isOverloadedOperator() && 4152 "Expected an overloaded operator declaration"); 4153 4154 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4155 4156 // C++ [over.oper]p5: 4157 // The allocation and deallocation functions, operator new, 4158 // operator new[], operator delete and operator delete[], are 4159 // described completely in 3.7.3. The attributes and restrictions 4160 // found in the rest of this subclause do not apply to them unless 4161 // explicitly stated in 3.7.3. 4162 // FIXME: Write a separate routine for checking this. For now, just allow it. 4163 if (Op == OO_Delete || Op == OO_Array_Delete) 4164 return false; 4165 4166 if (Op == OO_New || Op == OO_Array_New) { 4167 bool ret = false; 4168 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 4169 QualType SizeTy = Context.getCanonicalType(Context.getSizeType()); 4170 QualType T = Context.getCanonicalType((*Param)->getType()); 4171 if (!T->isDependentType() && SizeTy != T) { 4172 Diag(FnDecl->getLocation(), 4173 diag::err_operator_new_param_type) << FnDecl->getDeclName() 4174 << SizeTy; 4175 ret = true; 4176 } 4177 } 4178 QualType ResultTy = Context.getCanonicalType(FnDecl->getResultType()); 4179 if (!ResultTy->isDependentType() && ResultTy != Context.VoidPtrTy) 4180 return Diag(FnDecl->getLocation(), 4181 diag::err_operator_new_result_type) << FnDecl->getDeclName() 4182 << static_cast<QualType>(Context.VoidPtrTy); 4183 return ret; 4184 } 4185 4186 // C++ [over.oper]p6: 4187 // An operator function shall either be a non-static member 4188 // function or be a non-member function and have at least one 4189 // parameter whose type is a class, a reference to a class, an 4190 // enumeration, or a reference to an enumeration. 4191 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4192 if (MethodDecl->isStatic()) 4193 return Diag(FnDecl->getLocation(), 4194 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4195 } else { 4196 bool ClassOrEnumParam = false; 4197 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4198 ParamEnd = FnDecl->param_end(); 4199 Param != ParamEnd; ++Param) { 4200 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4201 if (ParamType->isDependentType() || ParamType->isRecordType() || 4202 ParamType->isEnumeralType()) { 4203 ClassOrEnumParam = true; 4204 break; 4205 } 4206 } 4207 4208 if (!ClassOrEnumParam) 4209 return Diag(FnDecl->getLocation(), 4210 diag::err_operator_overload_needs_class_or_enum) 4211 << FnDecl->getDeclName(); 4212 } 4213 4214 // C++ [over.oper]p8: 4215 // An operator function cannot have default arguments (8.3.6), 4216 // except where explicitly stated below. 4217 // 4218 // Only the function-call operator allows default arguments 4219 // (C++ [over.call]p1). 4220 if (Op != OO_Call) { 4221 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4222 Param != FnDecl->param_end(); ++Param) { 4223 if ((*Param)->hasUnparsedDefaultArg()) 4224 return Diag((*Param)->getLocation(), 4225 diag::err_operator_overload_default_arg) 4226 << FnDecl->getDeclName(); 4227 else if (Expr *DefArg = (*Param)->getDefaultArg()) 4228 return Diag((*Param)->getLocation(), 4229 diag::err_operator_overload_default_arg) 4230 << FnDecl->getDeclName() << DefArg->getSourceRange(); 4231 } 4232 } 4233 4234 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4235 { false, false, false } 4236#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4237 , { Unary, Binary, MemberOnly } 4238#include "clang/Basic/OperatorKinds.def" 4239 }; 4240 4241 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4242 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4243 bool MustBeMemberOperator = OperatorUses[Op][2]; 4244 4245 // C++ [over.oper]p8: 4246 // [...] Operator functions cannot have more or fewer parameters 4247 // than the number required for the corresponding operator, as 4248 // described in the rest of this subclause. 4249 unsigned NumParams = FnDecl->getNumParams() 4250 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4251 if (Op != OO_Call && 4252 ((NumParams == 1 && !CanBeUnaryOperator) || 4253 (NumParams == 2 && !CanBeBinaryOperator) || 4254 (NumParams < 1) || (NumParams > 2))) { 4255 // We have the wrong number of parameters. 4256 unsigned ErrorKind; 4257 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4258 ErrorKind = 2; // 2 -> unary or binary. 4259 } else if (CanBeUnaryOperator) { 4260 ErrorKind = 0; // 0 -> unary 4261 } else { 4262 assert(CanBeBinaryOperator && 4263 "All non-call overloaded operators are unary or binary!"); 4264 ErrorKind = 1; // 1 -> binary 4265 } 4266 4267 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4268 << FnDecl->getDeclName() << NumParams << ErrorKind; 4269 } 4270 4271 // Overloaded operators other than operator() cannot be variadic. 4272 if (Op != OO_Call && 4273 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4274 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4275 << FnDecl->getDeclName(); 4276 } 4277 4278 // Some operators must be non-static member functions. 4279 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4280 return Diag(FnDecl->getLocation(), 4281 diag::err_operator_overload_must_be_member) 4282 << FnDecl->getDeclName(); 4283 } 4284 4285 // C++ [over.inc]p1: 4286 // The user-defined function called operator++ implements the 4287 // prefix and postfix ++ operator. If this function is a member 4288 // function with no parameters, or a non-member function with one 4289 // parameter of class or enumeration type, it defines the prefix 4290 // increment operator ++ for objects of that type. If the function 4291 // is a member function with one parameter (which shall be of type 4292 // int) or a non-member function with two parameters (the second 4293 // of which shall be of type int), it defines the postfix 4294 // increment operator ++ for objects of that type. 4295 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4296 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4297 bool ParamIsInt = false; 4298 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4299 ParamIsInt = BT->getKind() == BuiltinType::Int; 4300 4301 if (!ParamIsInt) 4302 return Diag(LastParam->getLocation(), 4303 diag::err_operator_overload_post_incdec_must_be_int) 4304 << LastParam->getType() << (Op == OO_MinusMinus); 4305 } 4306 4307 // Notify the class if it got an assignment operator. 4308 if (Op == OO_Equal) { 4309 // Would have returned earlier otherwise. 4310 assert(isa<CXXMethodDecl>(FnDecl) && 4311 "Overloaded = not member, but not filtered."); 4312 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4313 Method->getParent()->addedAssignmentOperator(Context, Method); 4314 } 4315 4316 return false; 4317} 4318 4319/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4320/// linkage specification, including the language and (if present) 4321/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4322/// the location of the language string literal, which is provided 4323/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4324/// the '{' brace. Otherwise, this linkage specification does not 4325/// have any braces. 4326Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4327 SourceLocation ExternLoc, 4328 SourceLocation LangLoc, 4329 const char *Lang, 4330 unsigned StrSize, 4331 SourceLocation LBraceLoc) { 4332 LinkageSpecDecl::LanguageIDs Language; 4333 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4334 Language = LinkageSpecDecl::lang_c; 4335 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4336 Language = LinkageSpecDecl::lang_cxx; 4337 else { 4338 Diag(LangLoc, diag::err_bad_language); 4339 return DeclPtrTy(); 4340 } 4341 4342 // FIXME: Add all the various semantics of linkage specifications 4343 4344 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4345 LangLoc, Language, 4346 LBraceLoc.isValid()); 4347 CurContext->addDecl(D); 4348 PushDeclContext(S, D); 4349 return DeclPtrTy::make(D); 4350} 4351 4352/// ActOnFinishLinkageSpecification - Completely the definition of 4353/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4354/// valid, it's the position of the closing '}' brace in a linkage 4355/// specification that uses braces. 4356Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4357 DeclPtrTy LinkageSpec, 4358 SourceLocation RBraceLoc) { 4359 if (LinkageSpec) 4360 PopDeclContext(); 4361 return LinkageSpec; 4362} 4363 4364/// \brief Perform semantic analysis for the variable declaration that 4365/// occurs within a C++ catch clause, returning the newly-created 4366/// variable. 4367VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4368 DeclaratorInfo *DInfo, 4369 IdentifierInfo *Name, 4370 SourceLocation Loc, 4371 SourceRange Range) { 4372 bool Invalid = false; 4373 4374 // Arrays and functions decay. 4375 if (ExDeclType->isArrayType()) 4376 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4377 else if (ExDeclType->isFunctionType()) 4378 ExDeclType = Context.getPointerType(ExDeclType); 4379 4380 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4381 // The exception-declaration shall not denote a pointer or reference to an 4382 // incomplete type, other than [cv] void*. 4383 // N2844 forbids rvalue references. 4384 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4385 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4386 Invalid = true; 4387 } 4388 4389 QualType BaseType = ExDeclType; 4390 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 4391 unsigned DK = diag::err_catch_incomplete; 4392 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 4393 BaseType = Ptr->getPointeeType(); 4394 Mode = 1; 4395 DK = diag::err_catch_incomplete_ptr; 4396 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 4397 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 4398 BaseType = Ref->getPointeeType(); 4399 Mode = 2; 4400 DK = diag::err_catch_incomplete_ref; 4401 } 4402 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 4403 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 4404 Invalid = true; 4405 4406 if (!Invalid && !ExDeclType->isDependentType() && 4407 RequireNonAbstractType(Loc, ExDeclType, 4408 diag::err_abstract_type_in_decl, 4409 AbstractVariableType)) 4410 Invalid = true; 4411 4412 // FIXME: Need to test for ability to copy-construct and destroy the 4413 // exception variable. 4414 4415 // FIXME: Need to check for abstract classes. 4416 4417 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 4418 Name, ExDeclType, DInfo, VarDecl::None); 4419 4420 if (Invalid) 4421 ExDecl->setInvalidDecl(); 4422 4423 return ExDecl; 4424} 4425 4426/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 4427/// handler. 4428Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 4429 DeclaratorInfo *DInfo = 0; 4430 QualType ExDeclType = GetTypeForDeclarator(D, S, &DInfo); 4431 4432 bool Invalid = D.isInvalidType(); 4433 IdentifierInfo *II = D.getIdentifier(); 4434 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 4435 // The scope should be freshly made just for us. There is just no way 4436 // it contains any previous declaration. 4437 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 4438 if (PrevDecl->isTemplateParameter()) { 4439 // Maybe we will complain about the shadowed template parameter. 4440 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4441 } 4442 } 4443 4444 if (D.getCXXScopeSpec().isSet() && !Invalid) { 4445 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 4446 << D.getCXXScopeSpec().getRange(); 4447 Invalid = true; 4448 } 4449 4450 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, DInfo, 4451 D.getIdentifier(), 4452 D.getIdentifierLoc(), 4453 D.getDeclSpec().getSourceRange()); 4454 4455 if (Invalid) 4456 ExDecl->setInvalidDecl(); 4457 4458 // Add the exception declaration into this scope. 4459 if (II) 4460 PushOnScopeChains(ExDecl, S); 4461 else 4462 CurContext->addDecl(ExDecl); 4463 4464 ProcessDeclAttributes(S, ExDecl, D); 4465 return DeclPtrTy::make(ExDecl); 4466} 4467 4468Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 4469 ExprArg assertexpr, 4470 ExprArg assertmessageexpr) { 4471 Expr *AssertExpr = (Expr *)assertexpr.get(); 4472 StringLiteral *AssertMessage = 4473 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 4474 4475 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 4476 llvm::APSInt Value(32); 4477 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 4478 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 4479 AssertExpr->getSourceRange(); 4480 return DeclPtrTy(); 4481 } 4482 4483 if (Value == 0) { 4484 std::string str(AssertMessage->getStrData(), 4485 AssertMessage->getByteLength()); 4486 Diag(AssertLoc, diag::err_static_assert_failed) 4487 << str << AssertExpr->getSourceRange(); 4488 } 4489 } 4490 4491 assertexpr.release(); 4492 assertmessageexpr.release(); 4493 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 4494 AssertExpr, AssertMessage); 4495 4496 CurContext->addDecl(Decl); 4497 return DeclPtrTy::make(Decl); 4498} 4499 4500/// Handle a friend type declaration. This works in tandem with 4501/// ActOnTag. 4502/// 4503/// Notes on friend class templates: 4504/// 4505/// We generally treat friend class declarations as if they were 4506/// declaring a class. So, for example, the elaborated type specifier 4507/// in a friend declaration is required to obey the restrictions of a 4508/// class-head (i.e. no typedefs in the scope chain), template 4509/// parameters are required to match up with simple template-ids, &c. 4510/// However, unlike when declaring a template specialization, it's 4511/// okay to refer to a template specialization without an empty 4512/// template parameter declaration, e.g. 4513/// friend class A<T>::B<unsigned>; 4514/// We permit this as a special case; if there are any template 4515/// parameters present at all, require proper matching, i.e. 4516/// template <> template <class T> friend class A<int>::B; 4517Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 4518 MultiTemplateParamsArg TempParams) { 4519 SourceLocation Loc = DS.getSourceRange().getBegin(); 4520 4521 assert(DS.isFriendSpecified()); 4522 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4523 4524 // Try to convert the decl specifier to a type. This works for 4525 // friend templates because ActOnTag never produces a ClassTemplateDecl 4526 // for a TUK_Friend. 4527 Declarator TheDeclarator(DS, Declarator::MemberContext); 4528 QualType T = GetTypeForDeclarator(TheDeclarator, S); 4529 if (TheDeclarator.isInvalidType()) 4530 return DeclPtrTy(); 4531 4532 // This is definitely an error in C++98. It's probably meant to 4533 // be forbidden in C++0x, too, but the specification is just 4534 // poorly written. 4535 // 4536 // The problem is with declarations like the following: 4537 // template <T> friend A<T>::foo; 4538 // where deciding whether a class C is a friend or not now hinges 4539 // on whether there exists an instantiation of A that causes 4540 // 'foo' to equal C. There are restrictions on class-heads 4541 // (which we declare (by fiat) elaborated friend declarations to 4542 // be) that makes this tractable. 4543 // 4544 // FIXME: handle "template <> friend class A<T>;", which 4545 // is possibly well-formed? Who even knows? 4546 if (TempParams.size() && !isa<ElaboratedType>(T)) { 4547 Diag(Loc, diag::err_tagless_friend_type_template) 4548 << DS.getSourceRange(); 4549 return DeclPtrTy(); 4550 } 4551 4552 // C++ [class.friend]p2: 4553 // An elaborated-type-specifier shall be used in a friend declaration 4554 // for a class.* 4555 // * The class-key of the elaborated-type-specifier is required. 4556 // This is one of the rare places in Clang where it's legitimate to 4557 // ask about the "spelling" of the type. 4558 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 4559 // If we evaluated the type to a record type, suggest putting 4560 // a tag in front. 4561 if (const RecordType *RT = T->getAs<RecordType>()) { 4562 RecordDecl *RD = RT->getDecl(); 4563 4564 std::string InsertionText = std::string(" ") + RD->getKindName(); 4565 4566 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 4567 << (unsigned) RD->getTagKind() 4568 << T 4569 << SourceRange(DS.getFriendSpecLoc()) 4570 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 4571 InsertionText); 4572 return DeclPtrTy(); 4573 }else { 4574 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 4575 << DS.getSourceRange(); 4576 return DeclPtrTy(); 4577 } 4578 } 4579 4580 // Enum types cannot be friends. 4581 if (T->getAs<EnumType>()) { 4582 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 4583 << SourceRange(DS.getFriendSpecLoc()); 4584 return DeclPtrTy(); 4585 } 4586 4587 // C++98 [class.friend]p1: A friend of a class is a function 4588 // or class that is not a member of the class . . . 4589 // But that's a silly restriction which nobody implements for 4590 // inner classes, and C++0x removes it anyway, so we only report 4591 // this (as a warning) if we're being pedantic. 4592 if (!getLangOptions().CPlusPlus0x) 4593 if (const RecordType *RT = T->getAs<RecordType>()) 4594 if (RT->getDecl()->getDeclContext() == CurContext) 4595 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 4596 4597 Decl *D; 4598 if (TempParams.size()) 4599 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 4600 TempParams.size(), 4601 (TemplateParameterList**) TempParams.release(), 4602 T.getTypePtr(), 4603 DS.getFriendSpecLoc()); 4604 else 4605 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 4606 DS.getFriendSpecLoc()); 4607 D->setAccess(AS_public); 4608 CurContext->addDecl(D); 4609 4610 return DeclPtrTy::make(D); 4611} 4612 4613Sema::DeclPtrTy 4614Sema::ActOnFriendFunctionDecl(Scope *S, 4615 Declarator &D, 4616 bool IsDefinition, 4617 MultiTemplateParamsArg TemplateParams) { 4618 const DeclSpec &DS = D.getDeclSpec(); 4619 4620 assert(DS.isFriendSpecified()); 4621 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4622 4623 SourceLocation Loc = D.getIdentifierLoc(); 4624 DeclaratorInfo *DInfo = 0; 4625 QualType T = GetTypeForDeclarator(D, S, &DInfo); 4626 4627 // C++ [class.friend]p1 4628 // A friend of a class is a function or class.... 4629 // Note that this sees through typedefs, which is intended. 4630 // It *doesn't* see through dependent types, which is correct 4631 // according to [temp.arg.type]p3: 4632 // If a declaration acquires a function type through a 4633 // type dependent on a template-parameter and this causes 4634 // a declaration that does not use the syntactic form of a 4635 // function declarator to have a function type, the program 4636 // is ill-formed. 4637 if (!T->isFunctionType()) { 4638 Diag(Loc, diag::err_unexpected_friend); 4639 4640 // It might be worthwhile to try to recover by creating an 4641 // appropriate declaration. 4642 return DeclPtrTy(); 4643 } 4644 4645 // C++ [namespace.memdef]p3 4646 // - If a friend declaration in a non-local class first declares a 4647 // class or function, the friend class or function is a member 4648 // of the innermost enclosing namespace. 4649 // - The name of the friend is not found by simple name lookup 4650 // until a matching declaration is provided in that namespace 4651 // scope (either before or after the class declaration granting 4652 // friendship). 4653 // - If a friend function is called, its name may be found by the 4654 // name lookup that considers functions from namespaces and 4655 // classes associated with the types of the function arguments. 4656 // - When looking for a prior declaration of a class or a function 4657 // declared as a friend, scopes outside the innermost enclosing 4658 // namespace scope are not considered. 4659 4660 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 4661 DeclarationName Name = GetNameForDeclarator(D); 4662 assert(Name); 4663 4664 // The context we found the declaration in, or in which we should 4665 // create the declaration. 4666 DeclContext *DC; 4667 4668 // FIXME: handle local classes 4669 4670 // Recover from invalid scope qualifiers as if they just weren't there. 4671 NamedDecl *PrevDecl = 0; 4672 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 4673 // FIXME: RequireCompleteDeclContext 4674 DC = computeDeclContext(ScopeQual); 4675 4676 // FIXME: handle dependent contexts 4677 if (!DC) return DeclPtrTy(); 4678 4679 LookupResult R(*this, Name, Loc, LookupOrdinaryName, ForRedeclaration); 4680 LookupQualifiedName(R, DC); 4681 PrevDecl = R.getAsSingleDecl(Context); 4682 4683 // If searching in that context implicitly found a declaration in 4684 // a different context, treat it like it wasn't found at all. 4685 // TODO: better diagnostics for this case. Suggesting the right 4686 // qualified scope would be nice... 4687 if (!PrevDecl || !PrevDecl->getDeclContext()->Equals(DC)) { 4688 D.setInvalidType(); 4689 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 4690 return DeclPtrTy(); 4691 } 4692 4693 // C++ [class.friend]p1: A friend of a class is a function or 4694 // class that is not a member of the class . . . 4695 if (DC->Equals(CurContext)) 4696 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4697 4698 // Otherwise walk out to the nearest namespace scope looking for matches. 4699 } else { 4700 // TODO: handle local class contexts. 4701 4702 DC = CurContext; 4703 while (true) { 4704 // Skip class contexts. If someone can cite chapter and verse 4705 // for this behavior, that would be nice --- it's what GCC and 4706 // EDG do, and it seems like a reasonable intent, but the spec 4707 // really only says that checks for unqualified existing 4708 // declarations should stop at the nearest enclosing namespace, 4709 // not that they should only consider the nearest enclosing 4710 // namespace. 4711 while (DC->isRecord()) 4712 DC = DC->getParent(); 4713 4714 LookupResult R(*this, Name, Loc, LookupOrdinaryName, ForRedeclaration); 4715 LookupQualifiedName(R, DC); 4716 PrevDecl = R.getAsSingleDecl(Context); 4717 4718 // TODO: decide what we think about using declarations. 4719 if (PrevDecl) 4720 break; 4721 4722 if (DC->isFileContext()) break; 4723 DC = DC->getParent(); 4724 } 4725 4726 // C++ [class.friend]p1: A friend of a class is a function or 4727 // class that is not a member of the class . . . 4728 // C++0x changes this for both friend types and functions. 4729 // Most C++ 98 compilers do seem to give an error here, so 4730 // we do, too. 4731 if (PrevDecl && DC->Equals(CurContext) && !getLangOptions().CPlusPlus0x) 4732 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4733 } 4734 4735 if (DC->isFileContext()) { 4736 // This implies that it has to be an operator or function. 4737 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 4738 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 4739 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 4740 Diag(Loc, diag::err_introducing_special_friend) << 4741 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 4742 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 4743 return DeclPtrTy(); 4744 } 4745 } 4746 4747 bool Redeclaration = false; 4748 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, DInfo, PrevDecl, 4749 move(TemplateParams), 4750 IsDefinition, 4751 Redeclaration); 4752 if (!ND) return DeclPtrTy(); 4753 4754 assert(ND->getDeclContext() == DC); 4755 assert(ND->getLexicalDeclContext() == CurContext); 4756 4757 // Add the function declaration to the appropriate lookup tables, 4758 // adjusting the redeclarations list as necessary. We don't 4759 // want to do this yet if the friending class is dependent. 4760 // 4761 // Also update the scope-based lookup if the target context's 4762 // lookup context is in lexical scope. 4763 if (!CurContext->isDependentContext()) { 4764 DC = DC->getLookupContext(); 4765 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 4766 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4767 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 4768 } 4769 4770 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 4771 D.getIdentifierLoc(), ND, 4772 DS.getFriendSpecLoc()); 4773 FrD->setAccess(AS_public); 4774 CurContext->addDecl(FrD); 4775 4776 return DeclPtrTy::make(ND); 4777} 4778 4779void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 4780 AdjustDeclIfTemplate(dcl); 4781 4782 Decl *Dcl = dcl.getAs<Decl>(); 4783 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 4784 if (!Fn) { 4785 Diag(DelLoc, diag::err_deleted_non_function); 4786 return; 4787 } 4788 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 4789 Diag(DelLoc, diag::err_deleted_decl_not_first); 4790 Diag(Prev->getLocation(), diag::note_previous_declaration); 4791 // If the declaration wasn't the first, we delete the function anyway for 4792 // recovery. 4793 } 4794 Fn->setDeleted(); 4795} 4796 4797static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 4798 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 4799 ++CI) { 4800 Stmt *SubStmt = *CI; 4801 if (!SubStmt) 4802 continue; 4803 if (isa<ReturnStmt>(SubStmt)) 4804 Self.Diag(SubStmt->getSourceRange().getBegin(), 4805 diag::err_return_in_constructor_handler); 4806 if (!isa<Expr>(SubStmt)) 4807 SearchForReturnInStmt(Self, SubStmt); 4808 } 4809} 4810 4811void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 4812 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 4813 CXXCatchStmt *Handler = TryBlock->getHandler(I); 4814 SearchForReturnInStmt(*this, Handler); 4815 } 4816} 4817 4818bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 4819 const CXXMethodDecl *Old) { 4820 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 4821 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 4822 4823 QualType CNewTy = Context.getCanonicalType(NewTy); 4824 QualType COldTy = Context.getCanonicalType(OldTy); 4825 4826 if (CNewTy == COldTy && 4827 CNewTy.getLocalCVRQualifiers() == COldTy.getLocalCVRQualifiers()) 4828 return false; 4829 4830 // Check if the return types are covariant 4831 QualType NewClassTy, OldClassTy; 4832 4833 /// Both types must be pointers or references to classes. 4834 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 4835 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 4836 NewClassTy = NewPT->getPointeeType(); 4837 OldClassTy = OldPT->getPointeeType(); 4838 } 4839 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 4840 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 4841 NewClassTy = NewRT->getPointeeType(); 4842 OldClassTy = OldRT->getPointeeType(); 4843 } 4844 } 4845 4846 // The return types aren't either both pointers or references to a class type. 4847 if (NewClassTy.isNull()) { 4848 Diag(New->getLocation(), 4849 diag::err_different_return_type_for_overriding_virtual_function) 4850 << New->getDeclName() << NewTy << OldTy; 4851 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4852 4853 return true; 4854 } 4855 4856 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 4857 // Check if the new class derives from the old class. 4858 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 4859 Diag(New->getLocation(), 4860 diag::err_covariant_return_not_derived) 4861 << New->getDeclName() << NewTy << OldTy; 4862 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4863 return true; 4864 } 4865 4866 // Check if we the conversion from derived to base is valid. 4867 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 4868 diag::err_covariant_return_inaccessible_base, 4869 diag::err_covariant_return_ambiguous_derived_to_base_conv, 4870 // FIXME: Should this point to the return type? 4871 New->getLocation(), SourceRange(), New->getDeclName())) { 4872 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4873 return true; 4874 } 4875 } 4876 4877 // The qualifiers of the return types must be the same. 4878 if (CNewTy.getLocalCVRQualifiers() != COldTy.getLocalCVRQualifiers()) { 4879 Diag(New->getLocation(), 4880 diag::err_covariant_return_type_different_qualifications) 4881 << New->getDeclName() << NewTy << OldTy; 4882 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4883 return true; 4884 }; 4885 4886 4887 // The new class type must have the same or less qualifiers as the old type. 4888 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 4889 Diag(New->getLocation(), 4890 diag::err_covariant_return_type_class_type_more_qualified) 4891 << New->getDeclName() << NewTy << OldTy; 4892 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4893 return true; 4894 }; 4895 4896 return false; 4897} 4898 4899/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 4900/// initializer for the declaration 'Dcl'. 4901/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 4902/// static data member of class X, names should be looked up in the scope of 4903/// class X. 4904void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4905 AdjustDeclIfTemplate(Dcl); 4906 4907 Decl *D = Dcl.getAs<Decl>(); 4908 // If there is no declaration, there was an error parsing it. 4909 if (D == 0) 4910 return; 4911 4912 // Check whether it is a declaration with a nested name specifier like 4913 // int foo::bar; 4914 if (!D->isOutOfLine()) 4915 return; 4916 4917 // C++ [basic.lookup.unqual]p13 4918 // 4919 // A name used in the definition of a static data member of class X 4920 // (after the qualified-id of the static member) is looked up as if the name 4921 // was used in a member function of X. 4922 4923 // Change current context into the context of the initializing declaration. 4924 EnterDeclaratorContext(S, D->getDeclContext()); 4925} 4926 4927/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 4928/// initializer for the declaration 'Dcl'. 4929void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4930 AdjustDeclIfTemplate(Dcl); 4931 4932 Decl *D = Dcl.getAs<Decl>(); 4933 // If there is no declaration, there was an error parsing it. 4934 if (D == 0) 4935 return; 4936 4937 // Check whether it is a declaration with a nested name specifier like 4938 // int foo::bar; 4939 if (!D->isOutOfLine()) 4940 return; 4941 4942 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 4943 ExitDeclaratorContext(S); 4944} 4945