SemaDeclCXX.cpp revision a4923eb7c4b04d360cb2747641a5e92818edf804
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 "clang/AST/ASTConsumer.h" 16#include "clang/AST/ASTContext.h" 17#include "clang/AST/CXXInheritance.h" 18#include "clang/AST/DeclVisitor.h" 19#include "clang/AST/TypeOrdering.h" 20#include "clang/AST/StmtVisitor.h" 21#include "clang/Parse/DeclSpec.h" 22#include "clang/Parse/Template.h" 23#include "clang/Basic/PartialDiagnostic.h" 24#include "clang/Lex/Preprocessor.h" 25#include "llvm/ADT/STLExtras.h" 26#include "llvm/Support/Compiler.h" 27#include <algorithm> // for std::equal 28#include <map> 29#include <set> 30 31using namespace clang; 32 33//===----------------------------------------------------------------------===// 34// CheckDefaultArgumentVisitor 35//===----------------------------------------------------------------------===// 36 37namespace { 38 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 39 /// the default argument of a parameter to determine whether it 40 /// contains any ill-formed subexpressions. For example, this will 41 /// diagnose the use of local variables or parameters within the 42 /// default argument expression. 43 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 44 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 45 Expr *DefaultArg; 46 Sema *S; 47 48 public: 49 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 50 : DefaultArg(defarg), S(s) {} 51 52 bool VisitExpr(Expr *Node); 53 bool VisitDeclRefExpr(DeclRefExpr *DRE); 54 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 55 }; 56 57 /// VisitExpr - Visit all of the children of this expression. 58 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 59 bool IsInvalid = false; 60 for (Stmt::child_iterator I = Node->child_begin(), 61 E = Node->child_end(); I != E; ++I) 62 IsInvalid |= Visit(*I); 63 return IsInvalid; 64 } 65 66 /// VisitDeclRefExpr - Visit a reference to a declaration, to 67 /// determine whether this declaration can be used in the default 68 /// argument expression. 69 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 70 NamedDecl *Decl = DRE->getDecl(); 71 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 72 // C++ [dcl.fct.default]p9 73 // Default arguments are evaluated each time the function is 74 // called. The order of evaluation of function arguments is 75 // unspecified. Consequently, parameters of a function shall not 76 // be used in default argument expressions, even if they are not 77 // evaluated. Parameters of a function declared before a default 78 // argument expression are in scope and can hide namespace and 79 // class member names. 80 return S->Diag(DRE->getSourceRange().getBegin(), 81 diag::err_param_default_argument_references_param) 82 << Param->getDeclName() << DefaultArg->getSourceRange(); 83 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 84 // C++ [dcl.fct.default]p7 85 // Local variables shall not be used in default argument 86 // expressions. 87 if (VDecl->isBlockVarDecl()) 88 return S->Diag(DRE->getSourceRange().getBegin(), 89 diag::err_param_default_argument_references_local) 90 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 91 } 92 93 return false; 94 } 95 96 /// VisitCXXThisExpr - Visit a C++ "this" expression. 97 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 98 // C++ [dcl.fct.default]p8: 99 // The keyword this shall not be used in a default argument of a 100 // member function. 101 return S->Diag(ThisE->getSourceRange().getBegin(), 102 diag::err_param_default_argument_references_this) 103 << ThisE->getSourceRange(); 104 } 105} 106 107bool 108Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 109 SourceLocation EqualLoc) { 110 QualType ParamType = Param->getType(); 111 112 if (RequireCompleteType(Param->getLocation(), Param->getType(), 113 diag::err_typecheck_decl_incomplete_type)) { 114 Param->setInvalidDecl(); 115 return true; 116 } 117 118 Expr *Arg = (Expr *)DefaultArg.get(); 119 120 // C++ [dcl.fct.default]p5 121 // A default argument expression is implicitly converted (clause 122 // 4) to the parameter type. The default argument expression has 123 // the same semantic constraints as the initializer expression in 124 // a declaration of a variable of the parameter type, using the 125 // copy-initialization semantics (8.5). 126 if (CheckInitializerTypes(Arg, ParamType, EqualLoc, 127 Param->getDeclName(), /*DirectInit=*/false)) 128 return true; 129 130 Arg = MaybeCreateCXXExprWithTemporaries(Arg, /*DestroyTemps=*/false); 131 132 // Okay: add the default argument to the parameter 133 Param->setDefaultArg(Arg); 134 135 DefaultArg.release(); 136 137 return false; 138} 139 140/// ActOnParamDefaultArgument - Check whether the default argument 141/// provided for a function parameter is well-formed. If so, attach it 142/// to the parameter declaration. 143void 144Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 145 ExprArg defarg) { 146 if (!param || !defarg.get()) 147 return; 148 149 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 150 UnparsedDefaultArgLocs.erase(Param); 151 152 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 153 QualType ParamType = Param->getType(); 154 155 // Default arguments are only permitted in C++ 156 if (!getLangOptions().CPlusPlus) { 157 Diag(EqualLoc, diag::err_param_default_argument) 158 << DefaultArg->getSourceRange(); 159 Param->setInvalidDecl(); 160 return; 161 } 162 163 // Check that the default argument is well-formed 164 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 165 if (DefaultArgChecker.Visit(DefaultArg.get())) { 166 Param->setInvalidDecl(); 167 return; 168 } 169 170 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 171} 172 173/// ActOnParamUnparsedDefaultArgument - We've seen a default 174/// argument for a function parameter, but we can't parse it yet 175/// because we're inside a class definition. Note that this default 176/// argument will be parsed later. 177void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 178 SourceLocation EqualLoc, 179 SourceLocation ArgLoc) { 180 if (!param) 181 return; 182 183 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 184 if (Param) 185 Param->setUnparsedDefaultArg(); 186 187 UnparsedDefaultArgLocs[Param] = ArgLoc; 188} 189 190/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 191/// the default argument for the parameter param failed. 192void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 193 if (!param) 194 return; 195 196 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 197 198 Param->setInvalidDecl(); 199 200 UnparsedDefaultArgLocs.erase(Param); 201} 202 203/// CheckExtraCXXDefaultArguments - Check for any extra default 204/// arguments in the declarator, which is not a function declaration 205/// or definition and therefore is not permitted to have default 206/// arguments. This routine should be invoked for every declarator 207/// that is not a function declaration or definition. 208void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 209 // C++ [dcl.fct.default]p3 210 // A default argument expression shall be specified only in the 211 // parameter-declaration-clause of a function declaration or in a 212 // template-parameter (14.1). It shall not be specified for a 213 // parameter pack. If it is specified in a 214 // parameter-declaration-clause, it shall not occur within a 215 // declarator or abstract-declarator of a parameter-declaration. 216 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 217 DeclaratorChunk &chunk = D.getTypeObject(i); 218 if (chunk.Kind == DeclaratorChunk::Function) { 219 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 220 ParmVarDecl *Param = 221 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 222 if (Param->hasUnparsedDefaultArg()) { 223 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 224 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 225 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 226 delete Toks; 227 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 228 } else if (Param->getDefaultArg()) { 229 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 230 << Param->getDefaultArg()->getSourceRange(); 231 Param->setDefaultArg(0); 232 } 233 } 234 } 235 } 236} 237 238// MergeCXXFunctionDecl - Merge two declarations of the same C++ 239// function, once we already know that they have the same 240// type. Subroutine of MergeFunctionDecl. Returns true if there was an 241// error, false otherwise. 242bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 243 bool Invalid = false; 244 245 // C++ [dcl.fct.default]p4: 246 // For non-template functions, default arguments can be added in 247 // later declarations of a function in the same 248 // scope. Declarations in different scopes have completely 249 // distinct sets of default arguments. That is, declarations in 250 // inner scopes do not acquire default arguments from 251 // declarations in outer scopes, and vice versa. In a given 252 // function declaration, all parameters subsequent to a 253 // parameter with a default argument shall have default 254 // arguments supplied in this or previous declarations. A 255 // default argument shall not be redefined by a later 256 // declaration (not even to the same value). 257 // 258 // C++ [dcl.fct.default]p6: 259 // Except for member functions of class templates, the default arguments 260 // in a member function definition that appears outside of the class 261 // definition are added to the set of default arguments provided by the 262 // member function declaration in the class definition. 263 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 264 ParmVarDecl *OldParam = Old->getParamDecl(p); 265 ParmVarDecl *NewParam = New->getParamDecl(p); 266 267 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 268 // FIXME: If the parameter doesn't have an identifier then the location 269 // points to the '=' which means that the fixit hint won't remove any 270 // extra spaces between the type and the '='. 271 SourceLocation Begin = NewParam->getLocation(); 272 if (NewParam->getIdentifier()) 273 Begin = PP.getLocForEndOfToken(Begin); 274 275 Diag(NewParam->getLocation(), 276 diag::err_param_default_argument_redefinition) 277 << NewParam->getDefaultArgRange() 278 << CodeModificationHint::CreateRemoval(SourceRange(Begin, 279 NewParam->getLocEnd())); 280 281 // Look for the function declaration where the default argument was 282 // actually written, which may be a declaration prior to Old. 283 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 284 Older; Older = Older->getPreviousDeclaration()) { 285 if (!Older->getParamDecl(p)->hasDefaultArg()) 286 break; 287 288 OldParam = Older->getParamDecl(p); 289 } 290 291 Diag(OldParam->getLocation(), diag::note_previous_definition) 292 << OldParam->getDefaultArgRange(); 293 Invalid = true; 294 } else if (OldParam->hasDefaultArg()) { 295 // Merge the old default argument into the new parameter 296 if (OldParam->hasUninstantiatedDefaultArg()) 297 NewParam->setUninstantiatedDefaultArg( 298 OldParam->getUninstantiatedDefaultArg()); 299 else 300 NewParam->setDefaultArg(OldParam->getDefaultArg()); 301 } else if (NewParam->hasDefaultArg()) { 302 if (New->getDescribedFunctionTemplate()) { 303 // Paragraph 4, quoted above, only applies to non-template functions. 304 Diag(NewParam->getLocation(), 305 diag::err_param_default_argument_template_redecl) 306 << NewParam->getDefaultArgRange(); 307 Diag(Old->getLocation(), diag::note_template_prev_declaration) 308 << false; 309 } else if (New->getTemplateSpecializationKind() 310 != TSK_ImplicitInstantiation && 311 New->getTemplateSpecializationKind() != TSK_Undeclared) { 312 // C++ [temp.expr.spec]p21: 313 // Default function arguments shall not be specified in a declaration 314 // or a definition for one of the following explicit specializations: 315 // - the explicit specialization of a function template; 316 // - the explicit specialization of a member function template; 317 // - the explicit specialization of a member function of a class 318 // template where the class template specialization to which the 319 // member function specialization belongs is implicitly 320 // instantiated. 321 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 322 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 323 << New->getDeclName() 324 << NewParam->getDefaultArgRange(); 325 } else if (New->getDeclContext()->isDependentContext()) { 326 // C++ [dcl.fct.default]p6 (DR217): 327 // Default arguments for a member function of a class template shall 328 // be specified on the initial declaration of the member function 329 // within the class template. 330 // 331 // Reading the tea leaves a bit in DR217 and its reference to DR205 332 // leads me to the conclusion that one cannot add default function 333 // arguments for an out-of-line definition of a member function of a 334 // dependent type. 335 int WhichKind = 2; 336 if (CXXRecordDecl *Record 337 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 338 if (Record->getDescribedClassTemplate()) 339 WhichKind = 0; 340 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 341 WhichKind = 1; 342 else 343 WhichKind = 2; 344 } 345 346 Diag(NewParam->getLocation(), 347 diag::err_param_default_argument_member_template_redecl) 348 << WhichKind 349 << NewParam->getDefaultArgRange(); 350 } 351 } 352 } 353 354 if (CheckEquivalentExceptionSpec( 355 Old->getType()->getAs<FunctionProtoType>(), Old->getLocation(), 356 New->getType()->getAs<FunctionProtoType>(), New->getLocation())) { 357 Invalid = true; 358 } 359 360 return Invalid; 361} 362 363/// CheckCXXDefaultArguments - Verify that the default arguments for a 364/// function declaration are well-formed according to C++ 365/// [dcl.fct.default]. 366void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 367 unsigned NumParams = FD->getNumParams(); 368 unsigned p; 369 370 // Find first parameter with a default argument 371 for (p = 0; p < NumParams; ++p) { 372 ParmVarDecl *Param = FD->getParamDecl(p); 373 if (Param->hasDefaultArg()) 374 break; 375 } 376 377 // C++ [dcl.fct.default]p4: 378 // In a given function declaration, all parameters 379 // subsequent to a parameter with a default argument shall 380 // have default arguments supplied in this or previous 381 // declarations. A default argument shall not be redefined 382 // by a later declaration (not even to the same value). 383 unsigned LastMissingDefaultArg = 0; 384 for (; p < NumParams; ++p) { 385 ParmVarDecl *Param = FD->getParamDecl(p); 386 if (!Param->hasDefaultArg()) { 387 if (Param->isInvalidDecl()) 388 /* We already complained about this parameter. */; 389 else if (Param->getIdentifier()) 390 Diag(Param->getLocation(), 391 diag::err_param_default_argument_missing_name) 392 << Param->getIdentifier(); 393 else 394 Diag(Param->getLocation(), 395 diag::err_param_default_argument_missing); 396 397 LastMissingDefaultArg = p; 398 } 399 } 400 401 if (LastMissingDefaultArg > 0) { 402 // Some default arguments were missing. Clear out all of the 403 // default arguments up to (and including) the last missing 404 // default argument, so that we leave the function parameters 405 // in a semantically valid state. 406 for (p = 0; p <= LastMissingDefaultArg; ++p) { 407 ParmVarDecl *Param = FD->getParamDecl(p); 408 if (Param->hasDefaultArg()) { 409 if (!Param->hasUnparsedDefaultArg()) 410 Param->getDefaultArg()->Destroy(Context); 411 Param->setDefaultArg(0); 412 } 413 } 414 } 415} 416 417/// isCurrentClassName - Determine whether the identifier II is the 418/// name of the class type currently being defined. In the case of 419/// nested classes, this will only return true if II is the name of 420/// the innermost class. 421bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 422 const CXXScopeSpec *SS) { 423 CXXRecordDecl *CurDecl; 424 if (SS && SS->isSet() && !SS->isInvalid()) { 425 DeclContext *DC = computeDeclContext(*SS, true); 426 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 427 } else 428 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 429 430 if (CurDecl) 431 return &II == CurDecl->getIdentifier(); 432 else 433 return false; 434} 435 436/// \brief Check the validity of a C++ base class specifier. 437/// 438/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 439/// and returns NULL otherwise. 440CXXBaseSpecifier * 441Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 442 SourceRange SpecifierRange, 443 bool Virtual, AccessSpecifier Access, 444 QualType BaseType, 445 SourceLocation BaseLoc) { 446 // C++ [class.union]p1: 447 // A union shall not have base classes. 448 if (Class->isUnion()) { 449 Diag(Class->getLocation(), diag::err_base_clause_on_union) 450 << SpecifierRange; 451 return 0; 452 } 453 454 if (BaseType->isDependentType()) 455 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 456 Class->getTagKind() == RecordDecl::TK_class, 457 Access, BaseType); 458 459 // Base specifiers must be record types. 460 if (!BaseType->isRecordType()) { 461 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 462 return 0; 463 } 464 465 // C++ [class.union]p1: 466 // A union shall not be used as a base class. 467 if (BaseType->isUnionType()) { 468 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 469 return 0; 470 } 471 472 // C++ [class.derived]p2: 473 // The class-name in a base-specifier shall not be an incompletely 474 // defined class. 475 if (RequireCompleteType(BaseLoc, BaseType, 476 PDiag(diag::err_incomplete_base_class) 477 << SpecifierRange)) 478 return 0; 479 480 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 481 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 482 assert(BaseDecl && "Record type has no declaration"); 483 BaseDecl = BaseDecl->getDefinition(Context); 484 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 485 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 486 assert(CXXBaseDecl && "Base type is not a C++ type"); 487 if (!CXXBaseDecl->isEmpty()) 488 Class->setEmpty(false); 489 if (CXXBaseDecl->isPolymorphic()) 490 Class->setPolymorphic(true); 491 492 // C++ [dcl.init.aggr]p1: 493 // An aggregate is [...] a class with [...] no base classes [...]. 494 Class->setAggregate(false); 495 Class->setPOD(false); 496 497 if (Virtual) { 498 // C++ [class.ctor]p5: 499 // A constructor is trivial if its class has no virtual base classes. 500 Class->setHasTrivialConstructor(false); 501 502 // C++ [class.copy]p6: 503 // A copy constructor is trivial if its class has no virtual base classes. 504 Class->setHasTrivialCopyConstructor(false); 505 506 // C++ [class.copy]p11: 507 // A copy assignment operator is trivial if its class has no virtual 508 // base classes. 509 Class->setHasTrivialCopyAssignment(false); 510 511 // C++0x [meta.unary.prop] is_empty: 512 // T is a class type, but not a union type, with ... no virtual base 513 // classes 514 Class->setEmpty(false); 515 } else { 516 // C++ [class.ctor]p5: 517 // A constructor is trivial if all the direct base classes of its 518 // class have trivial constructors. 519 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialConstructor()) 520 Class->setHasTrivialConstructor(false); 521 522 // C++ [class.copy]p6: 523 // A copy constructor is trivial if all the direct base classes of its 524 // class have trivial copy constructors. 525 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyConstructor()) 526 Class->setHasTrivialCopyConstructor(false); 527 528 // C++ [class.copy]p11: 529 // A copy assignment operator is trivial if all the direct base classes 530 // of its class have trivial copy assignment operators. 531 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyAssignment()) 532 Class->setHasTrivialCopyAssignment(false); 533 } 534 535 // C++ [class.ctor]p3: 536 // A destructor is trivial if all the direct base classes of its class 537 // have trivial destructors. 538 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialDestructor()) 539 Class->setHasTrivialDestructor(false); 540 541 // Create the base specifier. 542 // FIXME: Allocate via ASTContext? 543 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 544 Class->getTagKind() == RecordDecl::TK_class, 545 Access, BaseType); 546} 547 548/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 549/// one entry in the base class list of a class specifier, for 550/// example: 551/// class foo : public bar, virtual private baz { 552/// 'public bar' and 'virtual private baz' are each base-specifiers. 553Sema::BaseResult 554Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 555 bool Virtual, AccessSpecifier Access, 556 TypeTy *basetype, SourceLocation BaseLoc) { 557 if (!classdecl) 558 return true; 559 560 AdjustDeclIfTemplate(classdecl); 561 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 562 QualType BaseType = GetTypeFromParser(basetype); 563 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 564 Virtual, Access, 565 BaseType, BaseLoc)) 566 return BaseSpec; 567 568 return true; 569} 570 571/// \brief Performs the actual work of attaching the given base class 572/// specifiers to a C++ class. 573bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 574 unsigned NumBases) { 575 if (NumBases == 0) 576 return false; 577 578 // Used to keep track of which base types we have already seen, so 579 // that we can properly diagnose redundant direct base types. Note 580 // that the key is always the unqualified canonical type of the base 581 // class. 582 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 583 584 // Copy non-redundant base specifiers into permanent storage. 585 unsigned NumGoodBases = 0; 586 bool Invalid = false; 587 for (unsigned idx = 0; idx < NumBases; ++idx) { 588 QualType NewBaseType 589 = Context.getCanonicalType(Bases[idx]->getType()); 590 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 591 592 if (KnownBaseTypes[NewBaseType]) { 593 // C++ [class.mi]p3: 594 // A class shall not be specified as a direct base class of a 595 // derived class more than once. 596 Diag(Bases[idx]->getSourceRange().getBegin(), 597 diag::err_duplicate_base_class) 598 << KnownBaseTypes[NewBaseType]->getType() 599 << Bases[idx]->getSourceRange(); 600 601 // Delete the duplicate base class specifier; we're going to 602 // overwrite its pointer later. 603 Context.Deallocate(Bases[idx]); 604 605 Invalid = true; 606 } else { 607 // Okay, add this new base class. 608 KnownBaseTypes[NewBaseType] = Bases[idx]; 609 Bases[NumGoodBases++] = Bases[idx]; 610 } 611 } 612 613 // Attach the remaining base class specifiers to the derived class. 614 Class->setBases(Context, Bases, NumGoodBases); 615 616 // Delete the remaining (good) base class specifiers, since their 617 // data has been copied into the CXXRecordDecl. 618 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 619 Context.Deallocate(Bases[idx]); 620 621 return Invalid; 622} 623 624/// ActOnBaseSpecifiers - Attach the given base specifiers to the 625/// class, after checking whether there are any duplicate base 626/// classes. 627void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 628 unsigned NumBases) { 629 if (!ClassDecl || !Bases || !NumBases) 630 return; 631 632 AdjustDeclIfTemplate(ClassDecl); 633 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 634 (CXXBaseSpecifier**)(Bases), NumBases); 635} 636 637/// \brief Determine whether the type \p Derived is a C++ class that is 638/// derived from the type \p Base. 639bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 640 if (!getLangOptions().CPlusPlus) 641 return false; 642 643 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 644 if (!DerivedRT) 645 return false; 646 647 const RecordType *BaseRT = Base->getAs<RecordType>(); 648 if (!BaseRT) 649 return false; 650 651 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 652 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 653 return DerivedRD->isDerivedFrom(BaseRD); 654} 655 656/// \brief Determine whether the type \p Derived is a C++ class that is 657/// derived from the type \p Base. 658bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 659 if (!getLangOptions().CPlusPlus) 660 return false; 661 662 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 663 if (!DerivedRT) 664 return false; 665 666 const RecordType *BaseRT = Base->getAs<RecordType>(); 667 if (!BaseRT) 668 return false; 669 670 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 671 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 672 return DerivedRD->isDerivedFrom(BaseRD, Paths); 673} 674 675/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 676/// conversion (where Derived and Base are class types) is 677/// well-formed, meaning that the conversion is unambiguous (and 678/// that all of the base classes are accessible). Returns true 679/// and emits a diagnostic if the code is ill-formed, returns false 680/// otherwise. Loc is the location where this routine should point to 681/// if there is an error, and Range is the source range to highlight 682/// if there is an error. 683bool 684Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 685 unsigned InaccessibleBaseID, 686 unsigned AmbigiousBaseConvID, 687 SourceLocation Loc, SourceRange Range, 688 DeclarationName Name) { 689 // First, determine whether the path from Derived to Base is 690 // ambiguous. This is slightly more expensive than checking whether 691 // the Derived to Base conversion exists, because here we need to 692 // explore multiple paths to determine if there is an ambiguity. 693 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 694 /*DetectVirtual=*/false); 695 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 696 assert(DerivationOkay && 697 "Can only be used with a derived-to-base conversion"); 698 (void)DerivationOkay; 699 700 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 701 if (InaccessibleBaseID == 0) 702 return false; 703 // Check that the base class can be accessed. 704 return CheckBaseClassAccess(Derived, Base, InaccessibleBaseID, Paths, Loc, 705 Name); 706 } 707 708 // We know that the derived-to-base conversion is ambiguous, and 709 // we're going to produce a diagnostic. Perform the derived-to-base 710 // search just one more time to compute all of the possible paths so 711 // that we can print them out. This is more expensive than any of 712 // the previous derived-to-base checks we've done, but at this point 713 // performance isn't as much of an issue. 714 Paths.clear(); 715 Paths.setRecordingPaths(true); 716 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 717 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 718 (void)StillOkay; 719 720 // Build up a textual representation of the ambiguous paths, e.g., 721 // D -> B -> A, that will be used to illustrate the ambiguous 722 // conversions in the diagnostic. We only print one of the paths 723 // to each base class subobject. 724 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 725 726 Diag(Loc, AmbigiousBaseConvID) 727 << Derived << Base << PathDisplayStr << Range << Name; 728 return true; 729} 730 731bool 732Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 733 SourceLocation Loc, SourceRange Range, 734 bool IgnoreAccess) { 735 return CheckDerivedToBaseConversion(Derived, Base, 736 IgnoreAccess ? 0 : 737 diag::err_conv_to_inaccessible_base, 738 diag::err_ambiguous_derived_to_base_conv, 739 Loc, Range, DeclarationName()); 740} 741 742 743/// @brief Builds a string representing ambiguous paths from a 744/// specific derived class to different subobjects of the same base 745/// class. 746/// 747/// This function builds a string that can be used in error messages 748/// to show the different paths that one can take through the 749/// inheritance hierarchy to go from the derived class to different 750/// subobjects of a base class. The result looks something like this: 751/// @code 752/// struct D -> struct B -> struct A 753/// struct D -> struct C -> struct A 754/// @endcode 755std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 756 std::string PathDisplayStr; 757 std::set<unsigned> DisplayedPaths; 758 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 759 Path != Paths.end(); ++Path) { 760 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 761 // We haven't displayed a path to this particular base 762 // class subobject yet. 763 PathDisplayStr += "\n "; 764 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 765 for (CXXBasePath::const_iterator Element = Path->begin(); 766 Element != Path->end(); ++Element) 767 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 768 } 769 } 770 771 return PathDisplayStr; 772} 773 774//===----------------------------------------------------------------------===// 775// C++ class member Handling 776//===----------------------------------------------------------------------===// 777 778/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 779/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 780/// bitfield width if there is one and 'InitExpr' specifies the initializer if 781/// any. 782Sema::DeclPtrTy 783Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 784 MultiTemplateParamsArg TemplateParameterLists, 785 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 786 const DeclSpec &DS = D.getDeclSpec(); 787 DeclarationName Name = GetNameForDeclarator(D); 788 Expr *BitWidth = static_cast<Expr*>(BW); 789 Expr *Init = static_cast<Expr*>(InitExpr); 790 SourceLocation Loc = D.getIdentifierLoc(); 791 792 bool isFunc = D.isFunctionDeclarator(); 793 794 assert(!DS.isFriendSpecified()); 795 796 // C++ 9.2p6: A member shall not be declared to have automatic storage 797 // duration (auto, register) or with the extern storage-class-specifier. 798 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 799 // data members and cannot be applied to names declared const or static, 800 // and cannot be applied to reference members. 801 switch (DS.getStorageClassSpec()) { 802 case DeclSpec::SCS_unspecified: 803 case DeclSpec::SCS_typedef: 804 case DeclSpec::SCS_static: 805 // FALL THROUGH. 806 break; 807 case DeclSpec::SCS_mutable: 808 if (isFunc) { 809 if (DS.getStorageClassSpecLoc().isValid()) 810 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 811 else 812 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 813 814 // FIXME: It would be nicer if the keyword was ignored only for this 815 // declarator. Otherwise we could get follow-up errors. 816 D.getMutableDeclSpec().ClearStorageClassSpecs(); 817 } else { 818 QualType T = GetTypeForDeclarator(D, S); 819 diag::kind err = static_cast<diag::kind>(0); 820 if (T->isReferenceType()) 821 err = diag::err_mutable_reference; 822 else if (T.isConstQualified()) 823 err = diag::err_mutable_const; 824 if (err != 0) { 825 if (DS.getStorageClassSpecLoc().isValid()) 826 Diag(DS.getStorageClassSpecLoc(), err); 827 else 828 Diag(DS.getThreadSpecLoc(), err); 829 // FIXME: It would be nicer if the keyword was ignored only for this 830 // declarator. Otherwise we could get follow-up errors. 831 D.getMutableDeclSpec().ClearStorageClassSpecs(); 832 } 833 } 834 break; 835 default: 836 if (DS.getStorageClassSpecLoc().isValid()) 837 Diag(DS.getStorageClassSpecLoc(), 838 diag::err_storageclass_invalid_for_member); 839 else 840 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 841 D.getMutableDeclSpec().ClearStorageClassSpecs(); 842 } 843 844 if (!isFunc && 845 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 846 D.getNumTypeObjects() == 0) { 847 // Check also for this case: 848 // 849 // typedef int f(); 850 // f a; 851 // 852 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 853 isFunc = TDType->isFunctionType(); 854 } 855 856 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 857 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 858 !isFunc); 859 860 Decl *Member; 861 if (isInstField) { 862 // FIXME: Check for template parameters! 863 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 864 AS); 865 assert(Member && "HandleField never returns null"); 866 } else { 867 Member = HandleDeclarator(S, D, move(TemplateParameterLists), false) 868 .getAs<Decl>(); 869 if (!Member) { 870 if (BitWidth) DeleteExpr(BitWidth); 871 return DeclPtrTy(); 872 } 873 874 // Non-instance-fields can't have a bitfield. 875 if (BitWidth) { 876 if (Member->isInvalidDecl()) { 877 // don't emit another diagnostic. 878 } else if (isa<VarDecl>(Member)) { 879 // C++ 9.6p3: A bit-field shall not be a static member. 880 // "static member 'A' cannot be a bit-field" 881 Diag(Loc, diag::err_static_not_bitfield) 882 << Name << BitWidth->getSourceRange(); 883 } else if (isa<TypedefDecl>(Member)) { 884 // "typedef member 'x' cannot be a bit-field" 885 Diag(Loc, diag::err_typedef_not_bitfield) 886 << Name << BitWidth->getSourceRange(); 887 } else { 888 // A function typedef ("typedef int f(); f a;"). 889 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 890 Diag(Loc, diag::err_not_integral_type_bitfield) 891 << Name << cast<ValueDecl>(Member)->getType() 892 << BitWidth->getSourceRange(); 893 } 894 895 DeleteExpr(BitWidth); 896 BitWidth = 0; 897 Member->setInvalidDecl(); 898 } 899 900 Member->setAccess(AS); 901 902 // If we have declared a member function template, set the access of the 903 // templated declaration as well. 904 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 905 FunTmpl->getTemplatedDecl()->setAccess(AS); 906 } 907 908 assert((Name || isInstField) && "No identifier for non-field ?"); 909 910 if (Init) 911 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 912 if (Deleted) // FIXME: Source location is not very good. 913 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 914 915 if (isInstField) { 916 FieldCollector->Add(cast<FieldDecl>(Member)); 917 return DeclPtrTy(); 918 } 919 return DeclPtrTy::make(Member); 920} 921 922/// ActOnMemInitializer - Handle a C++ member initializer. 923Sema::MemInitResult 924Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 925 Scope *S, 926 const CXXScopeSpec &SS, 927 IdentifierInfo *MemberOrBase, 928 TypeTy *TemplateTypeTy, 929 SourceLocation IdLoc, 930 SourceLocation LParenLoc, 931 ExprTy **Args, unsigned NumArgs, 932 SourceLocation *CommaLocs, 933 SourceLocation RParenLoc) { 934 if (!ConstructorD) 935 return true; 936 937 AdjustDeclIfTemplate(ConstructorD); 938 939 CXXConstructorDecl *Constructor 940 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 941 if (!Constructor) { 942 // The user wrote a constructor initializer on a function that is 943 // not a C++ constructor. Ignore the error for now, because we may 944 // have more member initializers coming; we'll diagnose it just 945 // once in ActOnMemInitializers. 946 return true; 947 } 948 949 CXXRecordDecl *ClassDecl = Constructor->getParent(); 950 951 // C++ [class.base.init]p2: 952 // Names in a mem-initializer-id are looked up in the scope of the 953 // constructor’s class and, if not found in that scope, are looked 954 // up in the scope containing the constructor’s 955 // definition. [Note: if the constructor’s class contains a member 956 // with the same name as a direct or virtual base class of the 957 // class, a mem-initializer-id naming the member or base class and 958 // composed of a single identifier refers to the class member. A 959 // mem-initializer-id for the hidden base class may be specified 960 // using a qualified name. ] 961 if (!SS.getScopeRep() && !TemplateTypeTy) { 962 // Look for a member, first. 963 FieldDecl *Member = 0; 964 DeclContext::lookup_result Result 965 = ClassDecl->lookup(MemberOrBase); 966 if (Result.first != Result.second) 967 Member = dyn_cast<FieldDecl>(*Result.first); 968 969 // FIXME: Handle members of an anonymous union. 970 971 if (Member) 972 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 973 RParenLoc); 974 } 975 // It didn't name a member, so see if it names a class. 976 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 977 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 978 if (!BaseTy) 979 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 980 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 981 982 QualType BaseType = GetTypeFromParser(BaseTy); 983 984 return BuildBaseInitializer(BaseType, (Expr **)Args, NumArgs, IdLoc, 985 RParenLoc, ClassDecl); 986} 987 988/// Checks an initializer expression for use of uninitialized fields, such as 989/// containing the field that is being initialized. Returns true if there is an 990/// uninitialized field was used an updates the SourceLocation parameter; false 991/// otherwise. 992static bool InitExprContainsUninitializedFields(const Stmt* S, 993 const FieldDecl* LhsField, 994 SourceLocation* L) { 995 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 996 if (ME) { 997 const NamedDecl* RhsField = ME->getMemberDecl(); 998 if (RhsField == LhsField) { 999 // Initializing a field with itself. Throw a warning. 1000 // But wait; there are exceptions! 1001 // Exception #1: The field may not belong to this record. 1002 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1003 const Expr* base = ME->getBase(); 1004 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1005 // Even though the field matches, it does not belong to this record. 1006 return false; 1007 } 1008 // None of the exceptions triggered; return true to indicate an 1009 // uninitialized field was used. 1010 *L = ME->getMemberLoc(); 1011 return true; 1012 } 1013 } 1014 bool found = false; 1015 for (Stmt::const_child_iterator it = S->child_begin(); 1016 it != S->child_end() && found == false; 1017 ++it) { 1018 if (isa<CallExpr>(S)) { 1019 // Do not descend into function calls or constructors, as the use 1020 // of an uninitialized field may be valid. One would have to inspect 1021 // the contents of the function/ctor to determine if it is safe or not. 1022 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1023 // may be safe, depending on what the function/ctor does. 1024 continue; 1025 } 1026 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1027 } 1028 return found; 1029} 1030 1031Sema::MemInitResult 1032Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1033 unsigned NumArgs, SourceLocation IdLoc, 1034 SourceLocation RParenLoc) { 1035 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1036 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1037 ExprTemporaries.clear(); 1038 1039 // Diagnose value-uses of fields to initialize themselves, e.g. 1040 // foo(foo) 1041 // where foo is not also a parameter to the constructor. 1042 // TODO: implement -Wuninitialized and fold this into that framework. 1043 for (unsigned i = 0; i < NumArgs; ++i) { 1044 SourceLocation L; 1045 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1046 // FIXME: Return true in the case when other fields are used before being 1047 // uninitialized. For example, let this field be the i'th field. When 1048 // initializing the i'th field, throw a warning if any of the >= i'th 1049 // fields are used, as they are not yet initialized. 1050 // Right now we are only handling the case where the i'th field uses 1051 // itself in its initializer. 1052 Diag(L, diag::warn_field_is_uninit); 1053 } 1054 } 1055 1056 bool HasDependentArg = false; 1057 for (unsigned i = 0; i < NumArgs; i++) 1058 HasDependentArg |= Args[i]->isTypeDependent(); 1059 1060 CXXConstructorDecl *C = 0; 1061 QualType FieldType = Member->getType(); 1062 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1063 FieldType = Array->getElementType(); 1064 if (FieldType->isDependentType()) { 1065 // Can't check init for dependent type. 1066 } else if (FieldType->isRecordType()) { 1067 // Member is a record (struct/union/class), so pass the initializer 1068 // arguments down to the record's constructor. 1069 if (!HasDependentArg) { 1070 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1071 1072 C = PerformInitializationByConstructor(FieldType, 1073 MultiExprArg(*this, 1074 (void**)Args, 1075 NumArgs), 1076 IdLoc, 1077 SourceRange(IdLoc, RParenLoc), 1078 Member->getDeclName(), IK_Direct, 1079 ConstructorArgs); 1080 1081 if (C) { 1082 // Take over the constructor arguments as our own. 1083 NumArgs = ConstructorArgs.size(); 1084 Args = (Expr **)ConstructorArgs.take(); 1085 } 1086 } 1087 } else if (NumArgs != 1 && NumArgs != 0) { 1088 // The member type is not a record type (or an array of record 1089 // types), so it can be only be default- or copy-initialized. 1090 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 1091 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 1092 } else if (!HasDependentArg) { 1093 Expr *NewExp; 1094 if (NumArgs == 0) { 1095 if (FieldType->isReferenceType()) { 1096 Diag(IdLoc, diag::err_null_intialized_reference_member) 1097 << Member->getDeclName(); 1098 return Diag(Member->getLocation(), diag::note_declared_at); 1099 } 1100 NewExp = new (Context) CXXZeroInitValueExpr(FieldType, IdLoc, RParenLoc); 1101 NumArgs = 1; 1102 } 1103 else 1104 NewExp = (Expr*)Args[0]; 1105 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 1106 return true; 1107 Args[0] = NewExp; 1108 } 1109 1110 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1111 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1112 ExprTemporaries.clear(); 1113 1114 // FIXME: Perform direct initialization of the member. 1115 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 1116 NumArgs, C, IdLoc, RParenLoc); 1117} 1118 1119Sema::MemInitResult 1120Sema::BuildBaseInitializer(QualType BaseType, Expr **Args, 1121 unsigned NumArgs, SourceLocation IdLoc, 1122 SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) { 1123 bool HasDependentArg = false; 1124 for (unsigned i = 0; i < NumArgs; i++) 1125 HasDependentArg |= Args[i]->isTypeDependent(); 1126 1127 if (!BaseType->isDependentType()) { 1128 if (!BaseType->isRecordType()) 1129 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 1130 << BaseType << SourceRange(IdLoc, RParenLoc); 1131 1132 // C++ [class.base.init]p2: 1133 // [...] Unless the mem-initializer-id names a nonstatic data 1134 // member of the constructor’s class or a direct or virtual base 1135 // of that class, the mem-initializer is ill-formed. A 1136 // mem-initializer-list can initialize a base class using any 1137 // name that denotes that base class type. 1138 1139 // First, check for a direct base class. 1140 const CXXBaseSpecifier *DirectBaseSpec = 0; 1141 for (CXXRecordDecl::base_class_const_iterator Base = 1142 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 1143 if (Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1144 // We found a direct base of this type. That's what we're 1145 // initializing. 1146 DirectBaseSpec = &*Base; 1147 break; 1148 } 1149 } 1150 1151 // Check for a virtual base class. 1152 // FIXME: We might be able to short-circuit this if we know in advance that 1153 // there are no virtual bases. 1154 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1155 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1156 // We haven't found a base yet; search the class hierarchy for a 1157 // virtual base class. 1158 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1159 /*DetectVirtual=*/false); 1160 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 1161 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1162 Path != Paths.end(); ++Path) { 1163 if (Path->back().Base->isVirtual()) { 1164 VirtualBaseSpec = Path->back().Base; 1165 break; 1166 } 1167 } 1168 } 1169 } 1170 1171 // C++ [base.class.init]p2: 1172 // If a mem-initializer-id is ambiguous because it designates both 1173 // a direct non-virtual base class and an inherited virtual base 1174 // class, the mem-initializer is ill-formed. 1175 if (DirectBaseSpec && VirtualBaseSpec) 1176 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 1177 << BaseType << SourceRange(IdLoc, RParenLoc); 1178 // C++ [base.class.init]p2: 1179 // Unless the mem-initializer-id names a nonstatic data membeer of the 1180 // constructor's class ot a direst or virtual base of that class, the 1181 // mem-initializer is ill-formed. 1182 if (!DirectBaseSpec && !VirtualBaseSpec) 1183 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 1184 << BaseType << ClassDecl->getNameAsCString() 1185 << SourceRange(IdLoc, RParenLoc); 1186 } 1187 1188 CXXConstructorDecl *C = 0; 1189 if (!BaseType->isDependentType() && !HasDependentArg) { 1190 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 1191 Context.getCanonicalType(BaseType).getUnqualifiedType()); 1192 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1193 1194 C = PerformInitializationByConstructor(BaseType, 1195 MultiExprArg(*this, 1196 (void**)Args, NumArgs), 1197 IdLoc, SourceRange(IdLoc, RParenLoc), 1198 Name, IK_Direct, 1199 ConstructorArgs); 1200 if (C) { 1201 // Take over the constructor arguments as our own. 1202 NumArgs = ConstructorArgs.size(); 1203 Args = (Expr **)ConstructorArgs.take(); 1204 } 1205 } 1206 1207 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1208 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1209 ExprTemporaries.clear(); 1210 1211 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 1212 NumArgs, C, IdLoc, RParenLoc); 1213} 1214 1215bool 1216Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1217 CXXBaseOrMemberInitializer **Initializers, 1218 unsigned NumInitializers, 1219 bool IsImplicitConstructor) { 1220 // We need to build the initializer AST according to order of construction 1221 // and not what user specified in the Initializers list. 1222 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1223 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1224 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1225 bool HasDependentBaseInit = false; 1226 bool HadError = false; 1227 1228 for (unsigned i = 0; i < NumInitializers; i++) { 1229 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1230 if (Member->isBaseInitializer()) { 1231 if (Member->getBaseClass()->isDependentType()) 1232 HasDependentBaseInit = true; 1233 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1234 } else { 1235 AllBaseFields[Member->getMember()] = Member; 1236 } 1237 } 1238 1239 if (HasDependentBaseInit) { 1240 // FIXME. This does not preserve the ordering of the initializers. 1241 // Try (with -Wreorder) 1242 // template<class X> struct A {}; 1243 // template<class X> struct B : A<X> { 1244 // B() : x1(10), A<X>() {} 1245 // int x1; 1246 // }; 1247 // B<int> x; 1248 // On seeing one dependent type, we should essentially exit this routine 1249 // while preserving user-declared initializer list. When this routine is 1250 // called during instantiatiation process, this routine will rebuild the 1251 // ordered initializer list correctly. 1252 1253 // If we have a dependent base initialization, we can't determine the 1254 // association between initializers and bases; just dump the known 1255 // initializers into the list, and don't try to deal with other bases. 1256 for (unsigned i = 0; i < NumInitializers; i++) { 1257 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1258 if (Member->isBaseInitializer()) 1259 AllToInit.push_back(Member); 1260 } 1261 } else { 1262 // Push virtual bases before others. 1263 for (CXXRecordDecl::base_class_iterator VBase = 1264 ClassDecl->vbases_begin(), 1265 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1266 if (VBase->getType()->isDependentType()) 1267 continue; 1268 if (CXXBaseOrMemberInitializer *Value 1269 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1270 AllToInit.push_back(Value); 1271 } 1272 else { 1273 CXXRecordDecl *VBaseDecl = 1274 cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1275 assert(VBaseDecl && "SetBaseOrMemberInitializers - VBaseDecl null"); 1276 CXXConstructorDecl *Ctor = VBaseDecl->getDefaultConstructor(Context); 1277 if (!Ctor) { 1278 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1279 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1280 << 0 << VBase->getType(); 1281 Diag(VBaseDecl->getLocation(), diag::note_previous_class_decl) 1282 << Context.getTagDeclType(VBaseDecl); 1283 HadError = true; 1284 continue; 1285 } 1286 1287 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1288 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1289 Constructor->getLocation(), CtorArgs)) 1290 continue; 1291 1292 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1293 1294 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1295 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1296 ExprTemporaries.clear(); 1297 CXXBaseOrMemberInitializer *Member = 1298 new (Context) CXXBaseOrMemberInitializer(VBase->getType(), 1299 CtorArgs.takeAs<Expr>(), 1300 CtorArgs.size(), Ctor, 1301 SourceLocation(), 1302 SourceLocation()); 1303 AllToInit.push_back(Member); 1304 } 1305 } 1306 1307 for (CXXRecordDecl::base_class_iterator Base = 1308 ClassDecl->bases_begin(), 1309 E = ClassDecl->bases_end(); Base != E; ++Base) { 1310 // Virtuals are in the virtual base list and already constructed. 1311 if (Base->isVirtual()) 1312 continue; 1313 // Skip dependent types. 1314 if (Base->getType()->isDependentType()) 1315 continue; 1316 if (CXXBaseOrMemberInitializer *Value 1317 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1318 AllToInit.push_back(Value); 1319 } 1320 else { 1321 CXXRecordDecl *BaseDecl = 1322 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1323 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1324 CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context); 1325 if (!Ctor) { 1326 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1327 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1328 << 0 << Base->getType(); 1329 Diag(BaseDecl->getLocation(), diag::note_previous_class_decl) 1330 << Context.getTagDeclType(BaseDecl); 1331 HadError = true; 1332 continue; 1333 } 1334 1335 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1336 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1337 Constructor->getLocation(), CtorArgs)) 1338 continue; 1339 1340 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1341 1342 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1343 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1344 ExprTemporaries.clear(); 1345 CXXBaseOrMemberInitializer *Member = 1346 new (Context) CXXBaseOrMemberInitializer(Base->getType(), 1347 CtorArgs.takeAs<Expr>(), 1348 CtorArgs.size(), Ctor, 1349 SourceLocation(), 1350 SourceLocation()); 1351 AllToInit.push_back(Member); 1352 } 1353 } 1354 } 1355 1356 // non-static data members. 1357 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1358 E = ClassDecl->field_end(); Field != E; ++Field) { 1359 if ((*Field)->isAnonymousStructOrUnion()) { 1360 if (const RecordType *FieldClassType = 1361 Field->getType()->getAs<RecordType>()) { 1362 CXXRecordDecl *FieldClassDecl 1363 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1364 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1365 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1366 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1367 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1368 // set to the anonymous union data member used in the initializer 1369 // list. 1370 Value->setMember(*Field); 1371 Value->setAnonUnionMember(*FA); 1372 AllToInit.push_back(Value); 1373 break; 1374 } 1375 } 1376 } 1377 continue; 1378 } 1379 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1380 AllToInit.push_back(Value); 1381 continue; 1382 } 1383 1384 if ((*Field)->getType()->isDependentType()) 1385 continue; 1386 1387 QualType FT = Context.getBaseElementType((*Field)->getType()); 1388 if (const RecordType* RT = FT->getAs<RecordType>()) { 1389 CXXConstructorDecl *Ctor = 1390 cast<CXXRecordDecl>(RT->getDecl())->getDefaultConstructor(Context); 1391 if (!Ctor) { 1392 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1393 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1394 << 1 << (*Field)->getDeclName(); 1395 Diag(Field->getLocation(), diag::note_field_decl); 1396 Diag(RT->getDecl()->getLocation(), diag::note_previous_class_decl) 1397 << Context.getTagDeclType(RT->getDecl()); 1398 HadError = true; 1399 continue; 1400 } 1401 1402 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1403 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1404 Constructor->getLocation(), CtorArgs)) 1405 continue; 1406 1407 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1408 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1409 ExprTemporaries.clear(); 1410 CXXBaseOrMemberInitializer *Member = 1411 new (Context) CXXBaseOrMemberInitializer(*Field,CtorArgs.takeAs<Expr>(), 1412 CtorArgs.size(), Ctor, 1413 SourceLocation(), 1414 SourceLocation()); 1415 1416 AllToInit.push_back(Member); 1417 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1418 if (FT.isConstQualified() && Ctor->isTrivial()) { 1419 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1420 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1421 << 1 << (*Field)->getDeclName(); 1422 Diag((*Field)->getLocation(), diag::note_declared_at); 1423 HadError = true; 1424 } 1425 } 1426 else if (FT->isReferenceType()) { 1427 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1428 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1429 << 0 << (*Field)->getDeclName(); 1430 Diag((*Field)->getLocation(), diag::note_declared_at); 1431 HadError = true; 1432 } 1433 else if (FT.isConstQualified()) { 1434 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1435 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1436 << 1 << (*Field)->getDeclName(); 1437 Diag((*Field)->getLocation(), diag::note_declared_at); 1438 HadError = true; 1439 } 1440 } 1441 1442 NumInitializers = AllToInit.size(); 1443 if (NumInitializers > 0) { 1444 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1445 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1446 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1447 1448 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1449 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) 1450 baseOrMemberInitializers[Idx] = AllToInit[Idx]; 1451 } 1452 1453 return HadError; 1454} 1455 1456static void *GetKeyForTopLevelField(FieldDecl *Field) { 1457 // For anonymous unions, use the class declaration as the key. 1458 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1459 if (RT->getDecl()->isAnonymousStructOrUnion()) 1460 return static_cast<void *>(RT->getDecl()); 1461 } 1462 return static_cast<void *>(Field); 1463} 1464 1465static void *GetKeyForBase(QualType BaseType) { 1466 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1467 return (void *)RT; 1468 1469 assert(0 && "Unexpected base type!"); 1470 return 0; 1471} 1472 1473static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1474 bool MemberMaybeAnon = false) { 1475 // For fields injected into the class via declaration of an anonymous union, 1476 // use its anonymous union class declaration as the unique key. 1477 if (Member->isMemberInitializer()) { 1478 FieldDecl *Field = Member->getMember(); 1479 1480 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1481 // data member of the class. Data member used in the initializer list is 1482 // in AnonUnionMember field. 1483 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1484 Field = Member->getAnonUnionMember(); 1485 if (Field->getDeclContext()->isRecord()) { 1486 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1487 if (RD->isAnonymousStructOrUnion()) 1488 return static_cast<void *>(RD); 1489 } 1490 return static_cast<void *>(Field); 1491 } 1492 1493 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1494} 1495 1496/// ActOnMemInitializers - Handle the member initializers for a constructor. 1497void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1498 SourceLocation ColonLoc, 1499 MemInitTy **MemInits, unsigned NumMemInits) { 1500 if (!ConstructorDecl) 1501 return; 1502 1503 AdjustDeclIfTemplate(ConstructorDecl); 1504 1505 CXXConstructorDecl *Constructor 1506 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1507 1508 if (!Constructor) { 1509 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1510 return; 1511 } 1512 1513 if (!Constructor->isDependentContext()) { 1514 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1515 bool err = false; 1516 for (unsigned i = 0; i < NumMemInits; i++) { 1517 CXXBaseOrMemberInitializer *Member = 1518 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1519 void *KeyToMember = GetKeyForMember(Member); 1520 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1521 if (!PrevMember) { 1522 PrevMember = Member; 1523 continue; 1524 } 1525 if (FieldDecl *Field = Member->getMember()) 1526 Diag(Member->getSourceLocation(), 1527 diag::error_multiple_mem_initialization) 1528 << Field->getNameAsString(); 1529 else { 1530 Type *BaseClass = Member->getBaseClass(); 1531 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1532 Diag(Member->getSourceLocation(), 1533 diag::error_multiple_base_initialization) 1534 << QualType(BaseClass, 0); 1535 } 1536 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1537 << 0; 1538 err = true; 1539 } 1540 1541 if (err) 1542 return; 1543 } 1544 1545 SetBaseOrMemberInitializers(Constructor, 1546 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1547 NumMemInits, false); 1548 1549 if (Constructor->isDependentContext()) 1550 return; 1551 1552 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1553 Diagnostic::Ignored && 1554 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1555 Diagnostic::Ignored) 1556 return; 1557 1558 // Also issue warning if order of ctor-initializer list does not match order 1559 // of 1) base class declarations and 2) order of non-static data members. 1560 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1561 1562 CXXRecordDecl *ClassDecl 1563 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1564 // Push virtual bases before others. 1565 for (CXXRecordDecl::base_class_iterator VBase = 1566 ClassDecl->vbases_begin(), 1567 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1568 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1569 1570 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1571 E = ClassDecl->bases_end(); Base != E; ++Base) { 1572 // Virtuals are alread in the virtual base list and are constructed 1573 // first. 1574 if (Base->isVirtual()) 1575 continue; 1576 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1577 } 1578 1579 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1580 E = ClassDecl->field_end(); Field != E; ++Field) 1581 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1582 1583 int Last = AllBaseOrMembers.size(); 1584 int curIndex = 0; 1585 CXXBaseOrMemberInitializer *PrevMember = 0; 1586 for (unsigned i = 0; i < NumMemInits; i++) { 1587 CXXBaseOrMemberInitializer *Member = 1588 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1589 void *MemberInCtorList = GetKeyForMember(Member, true); 1590 1591 for (; curIndex < Last; curIndex++) 1592 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1593 break; 1594 if (curIndex == Last) { 1595 assert(PrevMember && "Member not in member list?!"); 1596 // Initializer as specified in ctor-initializer list is out of order. 1597 // Issue a warning diagnostic. 1598 if (PrevMember->isBaseInitializer()) { 1599 // Diagnostics is for an initialized base class. 1600 Type *BaseClass = PrevMember->getBaseClass(); 1601 Diag(PrevMember->getSourceLocation(), 1602 diag::warn_base_initialized) 1603 << QualType(BaseClass, 0); 1604 } else { 1605 FieldDecl *Field = PrevMember->getMember(); 1606 Diag(PrevMember->getSourceLocation(), 1607 diag::warn_field_initialized) 1608 << Field->getNameAsString(); 1609 } 1610 // Also the note! 1611 if (FieldDecl *Field = Member->getMember()) 1612 Diag(Member->getSourceLocation(), 1613 diag::note_fieldorbase_initialized_here) << 0 1614 << Field->getNameAsString(); 1615 else { 1616 Type *BaseClass = Member->getBaseClass(); 1617 Diag(Member->getSourceLocation(), 1618 diag::note_fieldorbase_initialized_here) << 1 1619 << QualType(BaseClass, 0); 1620 } 1621 for (curIndex = 0; curIndex < Last; curIndex++) 1622 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1623 break; 1624 } 1625 PrevMember = Member; 1626 } 1627} 1628 1629void 1630Sema::computeBaseOrMembersToDestroy(CXXDestructorDecl *Destructor) { 1631 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Destructor->getDeclContext()); 1632 llvm::SmallVector<uintptr_t, 32> AllToDestruct; 1633 1634 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1635 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1636 if (VBase->getType()->isDependentType()) 1637 continue; 1638 // Skip over virtual bases which have trivial destructors. 1639 CXXRecordDecl *BaseClassDecl 1640 = cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1641 if (BaseClassDecl->hasTrivialDestructor()) 1642 continue; 1643 if (const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context)) 1644 MarkDeclarationReferenced(Destructor->getLocation(), 1645 const_cast<CXXDestructorDecl*>(Dtor)); 1646 1647 uintptr_t Member = 1648 reinterpret_cast<uintptr_t>(VBase->getType().getTypePtr()) 1649 | CXXDestructorDecl::VBASE; 1650 AllToDestruct.push_back(Member); 1651 } 1652 for (CXXRecordDecl::base_class_iterator Base = 1653 ClassDecl->bases_begin(), 1654 E = ClassDecl->bases_end(); Base != E; ++Base) { 1655 if (Base->isVirtual()) 1656 continue; 1657 if (Base->getType()->isDependentType()) 1658 continue; 1659 // Skip over virtual bases which have trivial destructors. 1660 CXXRecordDecl *BaseClassDecl 1661 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1662 if (BaseClassDecl->hasTrivialDestructor()) 1663 continue; 1664 if (const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context)) 1665 MarkDeclarationReferenced(Destructor->getLocation(), 1666 const_cast<CXXDestructorDecl*>(Dtor)); 1667 uintptr_t Member = 1668 reinterpret_cast<uintptr_t>(Base->getType().getTypePtr()) 1669 | CXXDestructorDecl::DRCTNONVBASE; 1670 AllToDestruct.push_back(Member); 1671 } 1672 1673 // non-static data members. 1674 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1675 E = ClassDecl->field_end(); Field != E; ++Field) { 1676 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 1677 1678 if (const RecordType* RT = FieldType->getAs<RecordType>()) { 1679 // Skip over virtual bases which have trivial destructors. 1680 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1681 if (FieldClassDecl->hasTrivialDestructor()) 1682 continue; 1683 if (const CXXDestructorDecl *Dtor = 1684 FieldClassDecl->getDestructor(Context)) 1685 MarkDeclarationReferenced(Destructor->getLocation(), 1686 const_cast<CXXDestructorDecl*>(Dtor)); 1687 uintptr_t Member = reinterpret_cast<uintptr_t>(*Field); 1688 AllToDestruct.push_back(Member); 1689 } 1690 } 1691 1692 unsigned NumDestructions = AllToDestruct.size(); 1693 if (NumDestructions > 0) { 1694 Destructor->setNumBaseOrMemberDestructions(NumDestructions); 1695 uintptr_t *BaseOrMemberDestructions = 1696 new (Context) uintptr_t [NumDestructions]; 1697 // Insert in reverse order. 1698 for (int Idx = NumDestructions-1, i=0 ; Idx >= 0; --Idx) 1699 BaseOrMemberDestructions[i++] = AllToDestruct[Idx]; 1700 Destructor->setBaseOrMemberDestructions(BaseOrMemberDestructions); 1701 } 1702} 1703 1704void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1705 if (!CDtorDecl) 1706 return; 1707 1708 AdjustDeclIfTemplate(CDtorDecl); 1709 1710 if (CXXConstructorDecl *Constructor 1711 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1712 SetBaseOrMemberInitializers(Constructor, 0, 0, false); 1713} 1714 1715namespace { 1716 /// PureVirtualMethodCollector - traverses a class and its superclasses 1717 /// and determines if it has any pure virtual methods. 1718 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 1719 ASTContext &Context; 1720 1721 public: 1722 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1723 1724 private: 1725 MethodList Methods; 1726 1727 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1728 1729 public: 1730 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1731 : Context(Ctx) { 1732 1733 MethodList List; 1734 Collect(RD, List); 1735 1736 // Copy the temporary list to methods, and make sure to ignore any 1737 // null entries. 1738 for (size_t i = 0, e = List.size(); i != e; ++i) { 1739 if (List[i]) 1740 Methods.push_back(List[i]); 1741 } 1742 } 1743 1744 bool empty() const { return Methods.empty(); } 1745 1746 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1747 MethodList::const_iterator methods_end() { return Methods.end(); } 1748 }; 1749 1750 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1751 MethodList& Methods) { 1752 // First, collect the pure virtual methods for the base classes. 1753 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1754 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1755 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1756 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1757 if (BaseDecl && BaseDecl->isAbstract()) 1758 Collect(BaseDecl, Methods); 1759 } 1760 } 1761 1762 // Next, zero out any pure virtual methods that this class overrides. 1763 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1764 1765 MethodSetTy OverriddenMethods; 1766 size_t MethodsSize = Methods.size(); 1767 1768 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1769 i != e; ++i) { 1770 // Traverse the record, looking for methods. 1771 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1772 // If the method is pure virtual, add it to the methods vector. 1773 if (MD->isPure()) 1774 Methods.push_back(MD); 1775 1776 // Record all the overridden methods in our set. 1777 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1778 E = MD->end_overridden_methods(); I != E; ++I) { 1779 // Keep track of the overridden methods. 1780 OverriddenMethods.insert(*I); 1781 } 1782 } 1783 } 1784 1785 // Now go through the methods and zero out all the ones we know are 1786 // overridden. 1787 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1788 if (OverriddenMethods.count(Methods[i])) 1789 Methods[i] = 0; 1790 } 1791 1792 } 1793} 1794 1795 1796bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1797 unsigned DiagID, AbstractDiagSelID SelID, 1798 const CXXRecordDecl *CurrentRD) { 1799 if (SelID == -1) 1800 return RequireNonAbstractType(Loc, T, 1801 PDiag(DiagID), CurrentRD); 1802 else 1803 return RequireNonAbstractType(Loc, T, 1804 PDiag(DiagID) << SelID, CurrentRD); 1805} 1806 1807bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1808 const PartialDiagnostic &PD, 1809 const CXXRecordDecl *CurrentRD) { 1810 if (!getLangOptions().CPlusPlus) 1811 return false; 1812 1813 if (const ArrayType *AT = Context.getAsArrayType(T)) 1814 return RequireNonAbstractType(Loc, AT->getElementType(), PD, 1815 CurrentRD); 1816 1817 if (const PointerType *PT = T->getAs<PointerType>()) { 1818 // Find the innermost pointer type. 1819 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1820 PT = T; 1821 1822 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1823 return RequireNonAbstractType(Loc, AT->getElementType(), PD, CurrentRD); 1824 } 1825 1826 const RecordType *RT = T->getAs<RecordType>(); 1827 if (!RT) 1828 return false; 1829 1830 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1831 if (!RD) 1832 return false; 1833 1834 if (CurrentRD && CurrentRD != RD) 1835 return false; 1836 1837 if (!RD->isAbstract()) 1838 return false; 1839 1840 Diag(Loc, PD) << RD->getDeclName(); 1841 1842 // Check if we've already emitted the list of pure virtual functions for this 1843 // class. 1844 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1845 return true; 1846 1847 PureVirtualMethodCollector Collector(Context, RD); 1848 1849 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1850 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1851 const CXXMethodDecl *MD = *I; 1852 1853 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1854 MD->getDeclName(); 1855 } 1856 1857 if (!PureVirtualClassDiagSet) 1858 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1859 PureVirtualClassDiagSet->insert(RD); 1860 1861 return true; 1862} 1863 1864namespace { 1865 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1866 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1867 Sema &SemaRef; 1868 CXXRecordDecl *AbstractClass; 1869 1870 bool VisitDeclContext(const DeclContext *DC) { 1871 bool Invalid = false; 1872 1873 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1874 E = DC->decls_end(); I != E; ++I) 1875 Invalid |= Visit(*I); 1876 1877 return Invalid; 1878 } 1879 1880 public: 1881 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1882 : SemaRef(SemaRef), AbstractClass(ac) { 1883 Visit(SemaRef.Context.getTranslationUnitDecl()); 1884 } 1885 1886 bool VisitFunctionDecl(const FunctionDecl *FD) { 1887 if (FD->isThisDeclarationADefinition()) { 1888 // No need to do the check if we're in a definition, because it requires 1889 // that the return/param types are complete. 1890 // because that requires 1891 return VisitDeclContext(FD); 1892 } 1893 1894 // Check the return type. 1895 QualType RTy = FD->getType()->getAs<FunctionType>()->getResultType(); 1896 bool Invalid = 1897 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1898 diag::err_abstract_type_in_decl, 1899 Sema::AbstractReturnType, 1900 AbstractClass); 1901 1902 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1903 E = FD->param_end(); I != E; ++I) { 1904 const ParmVarDecl *VD = *I; 1905 Invalid |= 1906 SemaRef.RequireNonAbstractType(VD->getLocation(), 1907 VD->getOriginalType(), 1908 diag::err_abstract_type_in_decl, 1909 Sema::AbstractParamType, 1910 AbstractClass); 1911 } 1912 1913 return Invalid; 1914 } 1915 1916 bool VisitDecl(const Decl* D) { 1917 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1918 return VisitDeclContext(DC); 1919 1920 return false; 1921 } 1922 }; 1923} 1924 1925void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1926 DeclPtrTy TagDecl, 1927 SourceLocation LBrac, 1928 SourceLocation RBrac) { 1929 if (!TagDecl) 1930 return; 1931 1932 AdjustDeclIfTemplate(TagDecl); 1933 ActOnFields(S, RLoc, TagDecl, 1934 (DeclPtrTy*)FieldCollector->getCurFields(), 1935 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1936 1937 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1938 if (!RD->isAbstract()) { 1939 // Collect all the pure virtual methods and see if this is an abstract 1940 // class after all. 1941 PureVirtualMethodCollector Collector(Context, RD); 1942 if (!Collector.empty()) 1943 RD->setAbstract(true); 1944 } 1945 1946 if (RD->isAbstract()) 1947 AbstractClassUsageDiagnoser(*this, RD); 1948 1949 if (!RD->isDependentType() && !RD->isInvalidDecl()) 1950 AddImplicitlyDeclaredMembersToClass(RD); 1951} 1952 1953/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1954/// special functions, such as the default constructor, copy 1955/// constructor, or destructor, to the given C++ class (C++ 1956/// [special]p1). This routine can only be executed just before the 1957/// definition of the class is complete. 1958void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1959 CanQualType ClassType 1960 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1961 1962 // FIXME: Implicit declarations have exception specifications, which are 1963 // the union of the specifications of the implicitly called functions. 1964 1965 if (!ClassDecl->hasUserDeclaredConstructor()) { 1966 // C++ [class.ctor]p5: 1967 // A default constructor for a class X is a constructor of class X 1968 // that can be called without an argument. If there is no 1969 // user-declared constructor for class X, a default constructor is 1970 // implicitly declared. An implicitly-declared default constructor 1971 // is an inline public member of its class. 1972 DeclarationName Name 1973 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1974 CXXConstructorDecl *DefaultCon = 1975 CXXConstructorDecl::Create(Context, ClassDecl, 1976 ClassDecl->getLocation(), Name, 1977 Context.getFunctionType(Context.VoidTy, 1978 0, 0, false, 0), 1979 /*DInfo=*/0, 1980 /*isExplicit=*/false, 1981 /*isInline=*/true, 1982 /*isImplicitlyDeclared=*/true); 1983 DefaultCon->setAccess(AS_public); 1984 DefaultCon->setImplicit(); 1985 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1986 ClassDecl->addDecl(DefaultCon); 1987 } 1988 1989 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1990 // C++ [class.copy]p4: 1991 // If the class definition does not explicitly declare a copy 1992 // constructor, one is declared implicitly. 1993 1994 // C++ [class.copy]p5: 1995 // The implicitly-declared copy constructor for a class X will 1996 // have the form 1997 // 1998 // X::X(const X&) 1999 // 2000 // if 2001 bool HasConstCopyConstructor = true; 2002 2003 // -- each direct or virtual base class B of X has a copy 2004 // constructor whose first parameter is of type const B& or 2005 // const volatile B&, and 2006 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2007 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 2008 const CXXRecordDecl *BaseClassDecl 2009 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2010 HasConstCopyConstructor 2011 = BaseClassDecl->hasConstCopyConstructor(Context); 2012 } 2013 2014 // -- for all the nonstatic data members of X that are of a 2015 // class type M (or array thereof), each such class type 2016 // has a copy constructor whose first parameter is of type 2017 // const M& or const volatile M&. 2018 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2019 HasConstCopyConstructor && Field != ClassDecl->field_end(); 2020 ++Field) { 2021 QualType FieldType = (*Field)->getType(); 2022 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2023 FieldType = Array->getElementType(); 2024 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2025 const CXXRecordDecl *FieldClassDecl 2026 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2027 HasConstCopyConstructor 2028 = FieldClassDecl->hasConstCopyConstructor(Context); 2029 } 2030 } 2031 2032 // Otherwise, the implicitly declared copy constructor will have 2033 // the form 2034 // 2035 // X::X(X&) 2036 QualType ArgType = ClassType; 2037 if (HasConstCopyConstructor) 2038 ArgType = ArgType.withConst(); 2039 ArgType = Context.getLValueReferenceType(ArgType); 2040 2041 // An implicitly-declared copy constructor is an inline public 2042 // member of its class. 2043 DeclarationName Name 2044 = Context.DeclarationNames.getCXXConstructorName(ClassType); 2045 CXXConstructorDecl *CopyConstructor 2046 = CXXConstructorDecl::Create(Context, ClassDecl, 2047 ClassDecl->getLocation(), Name, 2048 Context.getFunctionType(Context.VoidTy, 2049 &ArgType, 1, 2050 false, 0), 2051 /*DInfo=*/0, 2052 /*isExplicit=*/false, 2053 /*isInline=*/true, 2054 /*isImplicitlyDeclared=*/true); 2055 CopyConstructor->setAccess(AS_public); 2056 CopyConstructor->setImplicit(); 2057 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 2058 2059 // Add the parameter to the constructor. 2060 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 2061 ClassDecl->getLocation(), 2062 /*IdentifierInfo=*/0, 2063 ArgType, /*DInfo=*/0, 2064 VarDecl::None, 0); 2065 CopyConstructor->setParams(Context, &FromParam, 1); 2066 ClassDecl->addDecl(CopyConstructor); 2067 } 2068 2069 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 2070 // Note: The following rules are largely analoguous to the copy 2071 // constructor rules. Note that virtual bases are not taken into account 2072 // for determining the argument type of the operator. Note also that 2073 // operators taking an object instead of a reference are allowed. 2074 // 2075 // C++ [class.copy]p10: 2076 // If the class definition does not explicitly declare a copy 2077 // assignment operator, one is declared implicitly. 2078 // The implicitly-defined copy assignment operator for a class X 2079 // will have the form 2080 // 2081 // X& X::operator=(const X&) 2082 // 2083 // if 2084 bool HasConstCopyAssignment = true; 2085 2086 // -- each direct base class B of X has a copy assignment operator 2087 // whose parameter is of type const B&, const volatile B& or B, 2088 // and 2089 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2090 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 2091 assert(!Base->getType()->isDependentType() && 2092 "Cannot generate implicit members for class with dependent bases."); 2093 const CXXRecordDecl *BaseClassDecl 2094 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2095 const CXXMethodDecl *MD = 0; 2096 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context, 2097 MD); 2098 } 2099 2100 // -- for all the nonstatic data members of X that are of a class 2101 // type M (or array thereof), each such class type has a copy 2102 // assignment operator whose parameter is of type const M&, 2103 // const volatile M& or M. 2104 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 2105 HasConstCopyAssignment && Field != ClassDecl->field_end(); 2106 ++Field) { 2107 QualType FieldType = (*Field)->getType(); 2108 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2109 FieldType = Array->getElementType(); 2110 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2111 const CXXRecordDecl *FieldClassDecl 2112 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2113 const CXXMethodDecl *MD = 0; 2114 HasConstCopyAssignment 2115 = FieldClassDecl->hasConstCopyAssignment(Context, MD); 2116 } 2117 } 2118 2119 // Otherwise, the implicitly declared copy assignment operator will 2120 // have the form 2121 // 2122 // X& X::operator=(X&) 2123 QualType ArgType = ClassType; 2124 QualType RetType = Context.getLValueReferenceType(ArgType); 2125 if (HasConstCopyAssignment) 2126 ArgType = ArgType.withConst(); 2127 ArgType = Context.getLValueReferenceType(ArgType); 2128 2129 // An implicitly-declared copy assignment operator is an inline public 2130 // member of its class. 2131 DeclarationName Name = 2132 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 2133 CXXMethodDecl *CopyAssignment = 2134 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 2135 Context.getFunctionType(RetType, &ArgType, 1, 2136 false, 0), 2137 /*DInfo=*/0, /*isStatic=*/false, /*isInline=*/true); 2138 CopyAssignment->setAccess(AS_public); 2139 CopyAssignment->setImplicit(); 2140 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 2141 CopyAssignment->setCopyAssignment(true); 2142 2143 // Add the parameter to the operator. 2144 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 2145 ClassDecl->getLocation(), 2146 /*IdentifierInfo=*/0, 2147 ArgType, /*DInfo=*/0, 2148 VarDecl::None, 0); 2149 CopyAssignment->setParams(Context, &FromParam, 1); 2150 2151 // Don't call addedAssignmentOperator. There is no way to distinguish an 2152 // implicit from an explicit assignment operator. 2153 ClassDecl->addDecl(CopyAssignment); 2154 } 2155 2156 if (!ClassDecl->hasUserDeclaredDestructor()) { 2157 // C++ [class.dtor]p2: 2158 // If a class has no user-declared destructor, a destructor is 2159 // declared implicitly. An implicitly-declared destructor is an 2160 // inline public member of its class. 2161 DeclarationName Name 2162 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2163 CXXDestructorDecl *Destructor 2164 = CXXDestructorDecl::Create(Context, ClassDecl, 2165 ClassDecl->getLocation(), Name, 2166 Context.getFunctionType(Context.VoidTy, 2167 0, 0, false, 0), 2168 /*isInline=*/true, 2169 /*isImplicitlyDeclared=*/true); 2170 Destructor->setAccess(AS_public); 2171 Destructor->setImplicit(); 2172 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 2173 ClassDecl->addDecl(Destructor); 2174 } 2175} 2176 2177void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 2178 Decl *D = TemplateD.getAs<Decl>(); 2179 if (!D) 2180 return; 2181 2182 TemplateParameterList *Params = 0; 2183 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 2184 Params = Template->getTemplateParameters(); 2185 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2186 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 2187 Params = PartialSpec->getTemplateParameters(); 2188 else 2189 return; 2190 2191 for (TemplateParameterList::iterator Param = Params->begin(), 2192 ParamEnd = Params->end(); 2193 Param != ParamEnd; ++Param) { 2194 NamedDecl *Named = cast<NamedDecl>(*Param); 2195 if (Named->getDeclName()) { 2196 S->AddDecl(DeclPtrTy::make(Named)); 2197 IdResolver.AddDecl(Named); 2198 } 2199 } 2200} 2201 2202/// ActOnStartDelayedCXXMethodDeclaration - We have completed 2203/// parsing a top-level (non-nested) C++ class, and we are now 2204/// parsing those parts of the given Method declaration that could 2205/// not be parsed earlier (C++ [class.mem]p2), such as default 2206/// arguments. This action should enter the scope of the given 2207/// Method declaration as if we had just parsed the qualified method 2208/// name. However, it should not bring the parameters into scope; 2209/// that will be performed by ActOnDelayedCXXMethodParameter. 2210void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2211 if (!MethodD) 2212 return; 2213 2214 AdjustDeclIfTemplate(MethodD); 2215 2216 CXXScopeSpec SS; 2217 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2218 QualType ClassTy 2219 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 2220 SS.setScopeRep( 2221 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 2222 ActOnCXXEnterDeclaratorScope(S, SS); 2223} 2224 2225/// ActOnDelayedCXXMethodParameter - We've already started a delayed 2226/// C++ method declaration. We're (re-)introducing the given 2227/// function parameter into scope for use in parsing later parts of 2228/// the method declaration. For example, we could see an 2229/// ActOnParamDefaultArgument event for this parameter. 2230void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 2231 if (!ParamD) 2232 return; 2233 2234 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 2235 2236 // If this parameter has an unparsed default argument, clear it out 2237 // to make way for the parsed default argument. 2238 if (Param->hasUnparsedDefaultArg()) 2239 Param->setDefaultArg(0); 2240 2241 S->AddDecl(DeclPtrTy::make(Param)); 2242 if (Param->getDeclName()) 2243 IdResolver.AddDecl(Param); 2244} 2245 2246/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 2247/// processing the delayed method declaration for Method. The method 2248/// declaration is now considered finished. There may be a separate 2249/// ActOnStartOfFunctionDef action later (not necessarily 2250/// immediately!) for this method, if it was also defined inside the 2251/// class body. 2252void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 2253 if (!MethodD) 2254 return; 2255 2256 AdjustDeclIfTemplate(MethodD); 2257 2258 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 2259 CXXScopeSpec SS; 2260 QualType ClassTy 2261 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 2262 SS.setScopeRep( 2263 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 2264 ActOnCXXExitDeclaratorScope(S, SS); 2265 2266 // Now that we have our default arguments, check the constructor 2267 // again. It could produce additional diagnostics or affect whether 2268 // the class has implicitly-declared destructors, among other 2269 // things. 2270 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 2271 CheckConstructor(Constructor); 2272 2273 // Check the default arguments, which we may have added. 2274 if (!Method->isInvalidDecl()) 2275 CheckCXXDefaultArguments(Method); 2276} 2277 2278/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 2279/// the well-formedness of the constructor declarator @p D with type @p 2280/// R. If there are any errors in the declarator, this routine will 2281/// emit diagnostics and set the invalid bit to true. In any case, the type 2282/// will be updated to reflect a well-formed type for the constructor and 2283/// returned. 2284QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 2285 FunctionDecl::StorageClass &SC) { 2286 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2287 2288 // C++ [class.ctor]p3: 2289 // A constructor shall not be virtual (10.3) or static (9.4). A 2290 // constructor can be invoked for a const, volatile or const 2291 // volatile object. A constructor shall not be declared const, 2292 // volatile, or const volatile (9.3.2). 2293 if (isVirtual) { 2294 if (!D.isInvalidType()) 2295 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2296 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 2297 << SourceRange(D.getIdentifierLoc()); 2298 D.setInvalidType(); 2299 } 2300 if (SC == FunctionDecl::Static) { 2301 if (!D.isInvalidType()) 2302 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 2303 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2304 << SourceRange(D.getIdentifierLoc()); 2305 D.setInvalidType(); 2306 SC = FunctionDecl::None; 2307 } 2308 2309 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2310 if (FTI.TypeQuals != 0) { 2311 if (FTI.TypeQuals & Qualifiers::Const) 2312 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2313 << "const" << SourceRange(D.getIdentifierLoc()); 2314 if (FTI.TypeQuals & Qualifiers::Volatile) 2315 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2316 << "volatile" << SourceRange(D.getIdentifierLoc()); 2317 if (FTI.TypeQuals & Qualifiers::Restrict) 2318 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 2319 << "restrict" << SourceRange(D.getIdentifierLoc()); 2320 } 2321 2322 // Rebuild the function type "R" without any type qualifiers (in 2323 // case any of the errors above fired) and with "void" as the 2324 // return type, since constructors don't have return types. We 2325 // *always* have to do this, because GetTypeForDeclarator will 2326 // put in a result type of "int" when none was specified. 2327 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 2328 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 2329 Proto->getNumArgs(), 2330 Proto->isVariadic(), 0); 2331} 2332 2333/// CheckConstructor - Checks a fully-formed constructor for 2334/// well-formedness, issuing any diagnostics required. Returns true if 2335/// the constructor declarator is invalid. 2336void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 2337 CXXRecordDecl *ClassDecl 2338 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 2339 if (!ClassDecl) 2340 return Constructor->setInvalidDecl(); 2341 2342 // C++ [class.copy]p3: 2343 // A declaration of a constructor for a class X is ill-formed if 2344 // its first parameter is of type (optionally cv-qualified) X and 2345 // either there are no other parameters or else all other 2346 // parameters have default arguments. 2347 if (!Constructor->isInvalidDecl() && 2348 ((Constructor->getNumParams() == 1) || 2349 (Constructor->getNumParams() > 1 && 2350 Constructor->getParamDecl(1)->hasDefaultArg())) && 2351 Constructor->getTemplateSpecializationKind() 2352 != TSK_ImplicitInstantiation) { 2353 QualType ParamType = Constructor->getParamDecl(0)->getType(); 2354 QualType ClassTy = Context.getTagDeclType(ClassDecl); 2355 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 2356 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 2357 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 2358 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 2359 2360 // FIXME: Rather that making the constructor invalid, we should endeavor 2361 // to fix the type. 2362 Constructor->setInvalidDecl(); 2363 } 2364 } 2365 2366 // Notify the class that we've added a constructor. 2367 ClassDecl->addedConstructor(Context, Constructor); 2368} 2369 2370/// CheckDestructor - Checks a fully-formed destructor for 2371/// well-formedness, issuing any diagnostics required. 2372void Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 2373 CXXRecordDecl *RD = Destructor->getParent(); 2374 2375 if (Destructor->isVirtual()) { 2376 SourceLocation Loc; 2377 2378 if (!Destructor->isImplicit()) 2379 Loc = Destructor->getLocation(); 2380 else 2381 Loc = RD->getLocation(); 2382 2383 // If we have a virtual destructor, look up the deallocation function 2384 FunctionDecl *OperatorDelete = 0; 2385 DeclarationName Name = 2386 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 2387 if (!FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 2388 Destructor->setOperatorDelete(OperatorDelete); 2389 } 2390} 2391 2392static inline bool 2393FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 2394 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2395 FTI.ArgInfo[0].Param && 2396 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 2397} 2398 2399/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 2400/// the well-formednes of the destructor declarator @p D with type @p 2401/// R. If there are any errors in the declarator, this routine will 2402/// emit diagnostics and set the declarator to invalid. Even if this happens, 2403/// will be updated to reflect a well-formed type for the destructor and 2404/// returned. 2405QualType Sema::CheckDestructorDeclarator(Declarator &D, 2406 FunctionDecl::StorageClass& SC) { 2407 // C++ [class.dtor]p1: 2408 // [...] A typedef-name that names a class is a class-name 2409 // (7.1.3); however, a typedef-name that names a class shall not 2410 // be used as the identifier in the declarator for a destructor 2411 // declaration. 2412 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 2413 if (isa<TypedefType>(DeclaratorType)) { 2414 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 2415 << DeclaratorType; 2416 D.setInvalidType(); 2417 } 2418 2419 // C++ [class.dtor]p2: 2420 // A destructor is used to destroy objects of its class type. A 2421 // destructor takes no parameters, and no return type can be 2422 // specified for it (not even void). The address of a destructor 2423 // shall not be taken. A destructor shall not be static. A 2424 // destructor can be invoked for a const, volatile or const 2425 // volatile object. A destructor shall not be declared const, 2426 // volatile or const volatile (9.3.2). 2427 if (SC == FunctionDecl::Static) { 2428 if (!D.isInvalidType()) 2429 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 2430 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2431 << SourceRange(D.getIdentifierLoc()); 2432 SC = FunctionDecl::None; 2433 D.setInvalidType(); 2434 } 2435 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2436 // Destructors don't have return types, but the parser will 2437 // happily parse something like: 2438 // 2439 // class X { 2440 // float ~X(); 2441 // }; 2442 // 2443 // The return type will be eliminated later. 2444 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 2445 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2446 << SourceRange(D.getIdentifierLoc()); 2447 } 2448 2449 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2450 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 2451 if (FTI.TypeQuals & Qualifiers::Const) 2452 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2453 << "const" << SourceRange(D.getIdentifierLoc()); 2454 if (FTI.TypeQuals & Qualifiers::Volatile) 2455 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2456 << "volatile" << SourceRange(D.getIdentifierLoc()); 2457 if (FTI.TypeQuals & Qualifiers::Restrict) 2458 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 2459 << "restrict" << SourceRange(D.getIdentifierLoc()); 2460 D.setInvalidType(); 2461 } 2462 2463 // Make sure we don't have any parameters. 2464 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 2465 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 2466 2467 // Delete the parameters. 2468 FTI.freeArgs(); 2469 D.setInvalidType(); 2470 } 2471 2472 // Make sure the destructor isn't variadic. 2473 if (FTI.isVariadic) { 2474 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 2475 D.setInvalidType(); 2476 } 2477 2478 // Rebuild the function type "R" without any type qualifiers or 2479 // parameters (in case any of the errors above fired) and with 2480 // "void" as the return type, since destructors don't have return 2481 // types. We *always* have to do this, because GetTypeForDeclarator 2482 // will put in a result type of "int" when none was specified. 2483 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 2484} 2485 2486/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 2487/// well-formednes of the conversion function declarator @p D with 2488/// type @p R. If there are any errors in the declarator, this routine 2489/// will emit diagnostics and return true. Otherwise, it will return 2490/// false. Either way, the type @p R will be updated to reflect a 2491/// well-formed type for the conversion operator. 2492void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 2493 FunctionDecl::StorageClass& SC) { 2494 // C++ [class.conv.fct]p1: 2495 // Neither parameter types nor return type can be specified. The 2496 // type of a conversion function (8.3.5) is "function taking no 2497 // parameter returning conversion-type-id." 2498 if (SC == FunctionDecl::Static) { 2499 if (!D.isInvalidType()) 2500 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 2501 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 2502 << SourceRange(D.getIdentifierLoc()); 2503 D.setInvalidType(); 2504 SC = FunctionDecl::None; 2505 } 2506 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 2507 // Conversion functions don't have return types, but the parser will 2508 // happily parse something like: 2509 // 2510 // class X { 2511 // float operator bool(); 2512 // }; 2513 // 2514 // The return type will be changed later anyway. 2515 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 2516 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2517 << SourceRange(D.getIdentifierLoc()); 2518 } 2519 2520 // Make sure we don't have any parameters. 2521 if (R->getAs<FunctionProtoType>()->getNumArgs() > 0) { 2522 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 2523 2524 // Delete the parameters. 2525 D.getTypeObject(0).Fun.freeArgs(); 2526 D.setInvalidType(); 2527 } 2528 2529 // Make sure the conversion function isn't variadic. 2530 if (R->getAs<FunctionProtoType>()->isVariadic() && !D.isInvalidType()) { 2531 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 2532 D.setInvalidType(); 2533 } 2534 2535 // C++ [class.conv.fct]p4: 2536 // The conversion-type-id shall not represent a function type nor 2537 // an array type. 2538 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 2539 if (ConvType->isArrayType()) { 2540 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 2541 ConvType = Context.getPointerType(ConvType); 2542 D.setInvalidType(); 2543 } else if (ConvType->isFunctionType()) { 2544 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 2545 ConvType = Context.getPointerType(ConvType); 2546 D.setInvalidType(); 2547 } 2548 2549 // Rebuild the function type "R" without any parameters (in case any 2550 // of the errors above fired) and with the conversion type as the 2551 // return type. 2552 R = Context.getFunctionType(ConvType, 0, 0, false, 2553 R->getAs<FunctionProtoType>()->getTypeQuals()); 2554 2555 // C++0x explicit conversion operators. 2556 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 2557 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2558 diag::warn_explicit_conversion_functions) 2559 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 2560} 2561 2562/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 2563/// the declaration of the given C++ conversion function. This routine 2564/// is responsible for recording the conversion function in the C++ 2565/// class, if possible. 2566Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 2567 assert(Conversion && "Expected to receive a conversion function declaration"); 2568 2569 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 2570 2571 // Make sure we aren't redeclaring the conversion function. 2572 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 2573 2574 // C++ [class.conv.fct]p1: 2575 // [...] A conversion function is never used to convert a 2576 // (possibly cv-qualified) object to the (possibly cv-qualified) 2577 // same object type (or a reference to it), to a (possibly 2578 // cv-qualified) base class of that type (or a reference to it), 2579 // or to (possibly cv-qualified) void. 2580 // FIXME: Suppress this warning if the conversion function ends up being a 2581 // virtual function that overrides a virtual function in a base class. 2582 QualType ClassType 2583 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 2584 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 2585 ConvType = ConvTypeRef->getPointeeType(); 2586 if (ConvType->isRecordType()) { 2587 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 2588 if (ConvType == ClassType) 2589 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 2590 << ClassType; 2591 else if (IsDerivedFrom(ClassType, ConvType)) 2592 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 2593 << ClassType << ConvType; 2594 } else if (ConvType->isVoidType()) { 2595 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 2596 << ClassType << ConvType; 2597 } 2598 2599 if (Conversion->getPreviousDeclaration()) { 2600 const NamedDecl *ExpectedPrevDecl = Conversion->getPreviousDeclaration(); 2601 if (FunctionTemplateDecl *ConversionTemplate 2602 = Conversion->getDescribedFunctionTemplate()) 2603 ExpectedPrevDecl = ConversionTemplate->getPreviousDeclaration(); 2604 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 2605 for (OverloadedFunctionDecl::function_iterator 2606 Conv = Conversions->function_begin(), 2607 ConvEnd = Conversions->function_end(); 2608 Conv != ConvEnd; ++Conv) { 2609 if (*Conv == ExpectedPrevDecl) { 2610 *Conv = Conversion; 2611 return DeclPtrTy::make(Conversion); 2612 } 2613 } 2614 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2615 } else if (FunctionTemplateDecl *ConversionTemplate 2616 = Conversion->getDescribedFunctionTemplate()) 2617 ClassDecl->addConversionFunction(ConversionTemplate); 2618 else if (!Conversion->getPrimaryTemplate()) // ignore specializations 2619 ClassDecl->addConversionFunction(Conversion); 2620 2621 return DeclPtrTy::make(Conversion); 2622} 2623 2624//===----------------------------------------------------------------------===// 2625// Namespace Handling 2626//===----------------------------------------------------------------------===// 2627 2628/// ActOnStartNamespaceDef - This is called at the start of a namespace 2629/// definition. 2630Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2631 SourceLocation IdentLoc, 2632 IdentifierInfo *II, 2633 SourceLocation LBrace) { 2634 NamespaceDecl *Namespc = 2635 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2636 Namespc->setLBracLoc(LBrace); 2637 2638 Scope *DeclRegionScope = NamespcScope->getParent(); 2639 2640 if (II) { 2641 // C++ [namespace.def]p2: 2642 // The identifier in an original-namespace-definition shall not have been 2643 // previously defined in the declarative region in which the 2644 // original-namespace-definition appears. The identifier in an 2645 // original-namespace-definition is the name of the namespace. Subsequently 2646 // in that declarative region, it is treated as an original-namespace-name. 2647 2648 NamedDecl *PrevDecl 2649 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, true); 2650 2651 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2652 // This is an extended namespace definition. 2653 // Attach this namespace decl to the chain of extended namespace 2654 // definitions. 2655 OrigNS->setNextNamespace(Namespc); 2656 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2657 2658 // Remove the previous declaration from the scope. 2659 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2660 IdResolver.RemoveDecl(OrigNS); 2661 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2662 } 2663 } else if (PrevDecl) { 2664 // This is an invalid name redefinition. 2665 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2666 << Namespc->getDeclName(); 2667 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2668 Namespc->setInvalidDecl(); 2669 // Continue on to push Namespc as current DeclContext and return it. 2670 } else if (II->isStr("std") && 2671 CurContext->getLookupContext()->isTranslationUnit()) { 2672 // This is the first "real" definition of the namespace "std", so update 2673 // our cache of the "std" namespace to point at this definition. 2674 if (StdNamespace) { 2675 // We had already defined a dummy namespace "std". Link this new 2676 // namespace definition to the dummy namespace "std". 2677 StdNamespace->setNextNamespace(Namespc); 2678 StdNamespace->setLocation(IdentLoc); 2679 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2680 } 2681 2682 // Make our StdNamespace cache point at the first real definition of the 2683 // "std" namespace. 2684 StdNamespace = Namespc; 2685 } 2686 2687 PushOnScopeChains(Namespc, DeclRegionScope); 2688 } else { 2689 // Anonymous namespaces. 2690 2691 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2692 // behaves as if it were replaced by 2693 // namespace unique { /* empty body */ } 2694 // using namespace unique; 2695 // namespace unique { namespace-body } 2696 // where all occurrences of 'unique' in a translation unit are 2697 // replaced by the same identifier and this identifier differs 2698 // from all other identifiers in the entire program. 2699 2700 // We just create the namespace with an empty name and then add an 2701 // implicit using declaration, just like the standard suggests. 2702 // 2703 // CodeGen enforces the "universally unique" aspect by giving all 2704 // declarations semantically contained within an anonymous 2705 // namespace internal linkage. 2706 2707 assert(Namespc->isAnonymousNamespace()); 2708 CurContext->addDecl(Namespc); 2709 2710 UsingDirectiveDecl* UD 2711 = UsingDirectiveDecl::Create(Context, CurContext, 2712 /* 'using' */ LBrace, 2713 /* 'namespace' */ SourceLocation(), 2714 /* qualifier */ SourceRange(), 2715 /* NNS */ NULL, 2716 /* identifier */ SourceLocation(), 2717 Namespc, 2718 /* Ancestor */ CurContext); 2719 UD->setImplicit(); 2720 CurContext->addDecl(UD); 2721 } 2722 2723 // Although we could have an invalid decl (i.e. the namespace name is a 2724 // redefinition), push it as current DeclContext and try to continue parsing. 2725 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2726 // for the namespace has the declarations that showed up in that particular 2727 // namespace definition. 2728 PushDeclContext(NamespcScope, Namespc); 2729 return DeclPtrTy::make(Namespc); 2730} 2731 2732/// ActOnFinishNamespaceDef - This callback is called after a namespace is 2733/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 2734void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 2735 Decl *Dcl = D.getAs<Decl>(); 2736 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 2737 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 2738 Namespc->setRBracLoc(RBrace); 2739 PopDeclContext(); 2740} 2741 2742Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 2743 SourceLocation UsingLoc, 2744 SourceLocation NamespcLoc, 2745 const CXXScopeSpec &SS, 2746 SourceLocation IdentLoc, 2747 IdentifierInfo *NamespcName, 2748 AttributeList *AttrList) { 2749 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2750 assert(NamespcName && "Invalid NamespcName."); 2751 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2752 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2753 2754 UsingDirectiveDecl *UDir = 0; 2755 2756 // Lookup namespace name. 2757 LookupResult R; 2758 LookupParsedName(R, S, &SS, NamespcName, LookupNamespaceName, false); 2759 if (R.isAmbiguous()) { 2760 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 2761 return DeclPtrTy(); 2762 } 2763 if (!R.empty()) { 2764 NamedDecl *NS = R.getFoundDecl(); 2765 // FIXME: Namespace aliases! 2766 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 2767 // C++ [namespace.udir]p1: 2768 // A using-directive specifies that the names in the nominated 2769 // namespace can be used in the scope in which the 2770 // using-directive appears after the using-directive. During 2771 // unqualified name lookup (3.4.1), the names appear as if they 2772 // were declared in the nearest enclosing namespace which 2773 // contains both the using-directive and the nominated 2774 // namespace. [Note: in this context, "contains" means "contains 2775 // directly or indirectly". ] 2776 2777 // Find enclosing context containing both using-directive and 2778 // nominated namespace. 2779 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2780 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2781 CommonAncestor = CommonAncestor->getParent(); 2782 2783 UDir = UsingDirectiveDecl::Create(Context, 2784 CurContext, UsingLoc, 2785 NamespcLoc, 2786 SS.getRange(), 2787 (NestedNameSpecifier *)SS.getScopeRep(), 2788 IdentLoc, 2789 cast<NamespaceDecl>(NS), 2790 CommonAncestor); 2791 PushUsingDirective(S, UDir); 2792 } else { 2793 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2794 } 2795 2796 // FIXME: We ignore attributes for now. 2797 delete AttrList; 2798 return DeclPtrTy::make(UDir); 2799} 2800 2801void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2802 // If scope has associated entity, then using directive is at namespace 2803 // or translation unit scope. We add UsingDirectiveDecls, into 2804 // it's lookup structure. 2805 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2806 Ctx->addDecl(UDir); 2807 else 2808 // Otherwise it is block-sope. using-directives will affect lookup 2809 // only to the end of scope. 2810 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2811} 2812 2813 2814Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2815 AccessSpecifier AS, 2816 SourceLocation UsingLoc, 2817 const CXXScopeSpec &SS, 2818 UnqualifiedId &Name, 2819 AttributeList *AttrList, 2820 bool IsTypeName) { 2821 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2822 2823 switch (Name.getKind()) { 2824 case UnqualifiedId::IK_Identifier: 2825 case UnqualifiedId::IK_OperatorFunctionId: 2826 case UnqualifiedId::IK_ConversionFunctionId: 2827 break; 2828 2829 case UnqualifiedId::IK_ConstructorName: 2830 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 2831 << SS.getRange(); 2832 return DeclPtrTy(); 2833 2834 case UnqualifiedId::IK_DestructorName: 2835 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 2836 << SS.getRange(); 2837 return DeclPtrTy(); 2838 2839 case UnqualifiedId::IK_TemplateId: 2840 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 2841 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 2842 return DeclPtrTy(); 2843 } 2844 2845 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 2846 NamedDecl *UD = BuildUsingDeclaration(UsingLoc, SS, 2847 Name.getSourceRange().getBegin(), 2848 TargetName, AttrList, IsTypeName); 2849 if (UD) { 2850 PushOnScopeChains(UD, S); 2851 UD->setAccess(AS); 2852 } 2853 2854 return DeclPtrTy::make(UD); 2855} 2856 2857NamedDecl *Sema::BuildUsingDeclaration(SourceLocation UsingLoc, 2858 const CXXScopeSpec &SS, 2859 SourceLocation IdentLoc, 2860 DeclarationName Name, 2861 AttributeList *AttrList, 2862 bool IsTypeName) { 2863 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2864 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2865 2866 // FIXME: We ignore attributes for now. 2867 delete AttrList; 2868 2869 if (SS.isEmpty()) { 2870 Diag(IdentLoc, diag::err_using_requires_qualname); 2871 return 0; 2872 } 2873 2874 NestedNameSpecifier *NNS = 2875 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 2876 2877 DeclContext *LookupContext = computeDeclContext(SS); 2878 if (!LookupContext) { 2879 return UnresolvedUsingDecl::Create(Context, CurContext, UsingLoc, 2880 SS.getRange(), NNS, 2881 IdentLoc, Name, IsTypeName); 2882 } 2883 2884 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) { 2885 // C++0x N2914 [namespace.udecl]p3: 2886 // A using-declaration used as a member-declaration shall refer to a member 2887 // of a base class of the class being defined, shall refer to a member of an 2888 // anonymous union that is a member of a base class of the class being 2889 // defined, or shall refer to an enumerator for an enumeration type that is 2890 // a member of a base class of the class being defined. 2891 2892 CXXRecordDecl *LookupRD = dyn_cast<CXXRecordDecl>(LookupContext); 2893 if (!LookupRD || !RD->isDerivedFrom(LookupRD)) { 2894 Diag(SS.getRange().getBegin(), 2895 diag::err_using_decl_nested_name_specifier_is_not_a_base_class) 2896 << NNS << RD->getDeclName(); 2897 return 0; 2898 } 2899 } else { 2900 // C++0x N2914 [namespace.udecl]p8: 2901 // A using-declaration for a class member shall be a member-declaration. 2902 if (isa<CXXRecordDecl>(LookupContext)) { 2903 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_class_member) 2904 << SS.getRange(); 2905 return 0; 2906 } 2907 } 2908 2909 // Lookup target name. 2910 LookupResult R; 2911 LookupQualifiedName(R, LookupContext, Name, LookupOrdinaryName); 2912 2913 if (R.empty()) { 2914 Diag(IdentLoc, diag::err_no_member) 2915 << Name << LookupContext << SS.getRange(); 2916 return 0; 2917 } 2918 2919 // FIXME: handle ambiguity? 2920 NamedDecl *ND = R.getAsSingleDecl(Context); 2921 2922 if (IsTypeName && !isa<TypeDecl>(ND)) { 2923 Diag(IdentLoc, diag::err_using_typename_non_type); 2924 return 0; 2925 } 2926 2927 // C++0x N2914 [namespace.udecl]p6: 2928 // A using-declaration shall not name a namespace. 2929 if (isa<NamespaceDecl>(ND)) { 2930 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 2931 << SS.getRange(); 2932 return 0; 2933 } 2934 2935 return UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2936 ND->getLocation(), UsingLoc, ND, NNS, IsTypeName); 2937} 2938 2939/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2940/// is a namespace alias, returns the namespace it points to. 2941static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2942 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2943 return AD->getNamespace(); 2944 return dyn_cast_or_null<NamespaceDecl>(D); 2945} 2946 2947Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2948 SourceLocation NamespaceLoc, 2949 SourceLocation AliasLoc, 2950 IdentifierInfo *Alias, 2951 const CXXScopeSpec &SS, 2952 SourceLocation IdentLoc, 2953 IdentifierInfo *Ident) { 2954 2955 // Lookup the namespace name. 2956 LookupResult R; 2957 LookupParsedName(R, S, &SS, Ident, LookupNamespaceName, false); 2958 2959 // Check if we have a previous declaration with the same name. 2960 if (NamedDecl *PrevDecl 2961 = LookupSingleName(S, Alias, LookupOrdinaryName, true)) { 2962 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2963 // We already have an alias with the same name that points to the same 2964 // namespace, so don't create a new one. 2965 if (!R.isAmbiguous() && !R.empty() && 2966 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 2967 return DeclPtrTy(); 2968 } 2969 2970 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2971 diag::err_redefinition_different_kind; 2972 Diag(AliasLoc, DiagID) << Alias; 2973 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2974 return DeclPtrTy(); 2975 } 2976 2977 if (R.isAmbiguous()) { 2978 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2979 return DeclPtrTy(); 2980 } 2981 2982 if (R.empty()) { 2983 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2984 return DeclPtrTy(); 2985 } 2986 2987 NamespaceAliasDecl *AliasDecl = 2988 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2989 Alias, SS.getRange(), 2990 (NestedNameSpecifier *)SS.getScopeRep(), 2991 IdentLoc, R.getFoundDecl()); 2992 2993 CurContext->addDecl(AliasDecl); 2994 return DeclPtrTy::make(AliasDecl); 2995} 2996 2997void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2998 CXXConstructorDecl *Constructor) { 2999 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3000 !Constructor->isUsed()) && 3001 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3002 3003 CXXRecordDecl *ClassDecl 3004 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3005 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3006 3007 if (SetBaseOrMemberInitializers(Constructor, 0, 0, true)) { 3008 Diag(CurrentLocation, diag::note_ctor_synthesized_at) 3009 << Context.getTagDeclType(ClassDecl); 3010 Constructor->setInvalidDecl(); 3011 } else { 3012 Constructor->setUsed(); 3013 } 3014 return; 3015} 3016 3017void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3018 CXXDestructorDecl *Destructor) { 3019 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3020 "DefineImplicitDestructor - call it for implicit default dtor"); 3021 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3022 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3023 // C++ [class.dtor] p5 3024 // Before the implicitly-declared default destructor for a class is 3025 // implicitly defined, all the implicitly-declared default destructors 3026 // for its base class and its non-static data members shall have been 3027 // implicitly defined. 3028 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3029 E = ClassDecl->bases_end(); Base != E; ++Base) { 3030 CXXRecordDecl *BaseClassDecl 3031 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3032 if (!BaseClassDecl->hasTrivialDestructor()) { 3033 if (CXXDestructorDecl *BaseDtor = 3034 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 3035 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 3036 else 3037 assert(false && 3038 "DefineImplicitDestructor - missing dtor in a base class"); 3039 } 3040 } 3041 3042 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3043 E = ClassDecl->field_end(); Field != E; ++Field) { 3044 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3045 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3046 FieldType = Array->getElementType(); 3047 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3048 CXXRecordDecl *FieldClassDecl 3049 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3050 if (!FieldClassDecl->hasTrivialDestructor()) { 3051 if (CXXDestructorDecl *FieldDtor = 3052 const_cast<CXXDestructorDecl*>( 3053 FieldClassDecl->getDestructor(Context))) 3054 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 3055 else 3056 assert(false && 3057 "DefineImplicitDestructor - missing dtor in class of a data member"); 3058 } 3059 } 3060 } 3061 Destructor->setUsed(); 3062} 3063 3064void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3065 CXXMethodDecl *MethodDecl) { 3066 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3067 MethodDecl->getOverloadedOperator() == OO_Equal && 3068 !MethodDecl->isUsed()) && 3069 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3070 3071 CXXRecordDecl *ClassDecl 3072 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3073 3074 // C++[class.copy] p12 3075 // Before the implicitly-declared copy assignment operator for a class is 3076 // implicitly defined, all implicitly-declared copy assignment operators 3077 // for its direct base classes and its nonstatic data members shall have 3078 // been implicitly defined. 3079 bool err = false; 3080 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3081 E = ClassDecl->bases_end(); Base != E; ++Base) { 3082 CXXRecordDecl *BaseClassDecl 3083 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3084 if (CXXMethodDecl *BaseAssignOpMethod = 3085 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 3086 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3087 } 3088 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3089 E = ClassDecl->field_end(); Field != E; ++Field) { 3090 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3091 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3092 FieldType = Array->getElementType(); 3093 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3094 CXXRecordDecl *FieldClassDecl 3095 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3096 if (CXXMethodDecl *FieldAssignOpMethod = 3097 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 3098 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3099 } else if (FieldType->isReferenceType()) { 3100 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3101 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3102 Diag(Field->getLocation(), diag::note_declared_at); 3103 Diag(CurrentLocation, diag::note_first_required_here); 3104 err = true; 3105 } else if (FieldType.isConstQualified()) { 3106 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3107 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3108 Diag(Field->getLocation(), diag::note_declared_at); 3109 Diag(CurrentLocation, diag::note_first_required_here); 3110 err = true; 3111 } 3112 } 3113 if (!err) 3114 MethodDecl->setUsed(); 3115} 3116 3117CXXMethodDecl * 3118Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 3119 CXXRecordDecl *ClassDecl) { 3120 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3121 QualType RHSType(LHSType); 3122 // If class's assignment operator argument is const/volatile qualified, 3123 // look for operator = (const/volatile B&). Otherwise, look for 3124 // operator = (B&). 3125 RHSType = Context.getCVRQualifiedType(RHSType, 3126 ParmDecl->getType().getCVRQualifiers()); 3127 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3128 LHSType, 3129 SourceLocation())); 3130 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3131 RHSType, 3132 SourceLocation())); 3133 Expr *Args[2] = { &*LHS, &*RHS }; 3134 OverloadCandidateSet CandidateSet; 3135 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3136 CandidateSet); 3137 OverloadCandidateSet::iterator Best; 3138 if (BestViableFunction(CandidateSet, 3139 ClassDecl->getLocation(), Best) == OR_Success) 3140 return cast<CXXMethodDecl>(Best->Function); 3141 assert(false && 3142 "getAssignOperatorMethod - copy assignment operator method not found"); 3143 return 0; 3144} 3145 3146void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3147 CXXConstructorDecl *CopyConstructor, 3148 unsigned TypeQuals) { 3149 assert((CopyConstructor->isImplicit() && 3150 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 3151 !CopyConstructor->isUsed()) && 3152 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3153 3154 CXXRecordDecl *ClassDecl 3155 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3156 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3157 // C++ [class.copy] p209 3158 // Before the implicitly-declared copy constructor for a class is 3159 // implicitly defined, all the implicitly-declared copy constructors 3160 // for its base class and its non-static data members shall have been 3161 // implicitly defined. 3162 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3163 Base != ClassDecl->bases_end(); ++Base) { 3164 CXXRecordDecl *BaseClassDecl 3165 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3166 if (CXXConstructorDecl *BaseCopyCtor = 3167 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 3168 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3169 } 3170 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3171 FieldEnd = ClassDecl->field_end(); 3172 Field != FieldEnd; ++Field) { 3173 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3174 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3175 FieldType = Array->getElementType(); 3176 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3177 CXXRecordDecl *FieldClassDecl 3178 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3179 if (CXXConstructorDecl *FieldCopyCtor = 3180 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 3181 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3182 } 3183 } 3184 CopyConstructor->setUsed(); 3185} 3186 3187Sema::OwningExprResult 3188Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3189 CXXConstructorDecl *Constructor, 3190 MultiExprArg ExprArgs) { 3191 bool Elidable = false; 3192 3193 // C++ [class.copy]p15: 3194 // Whenever a temporary class object is copied using a copy constructor, and 3195 // this object and the copy have the same cv-unqualified type, an 3196 // implementation is permitted to treat the original and the copy as two 3197 // different ways of referring to the same object and not perform a copy at 3198 // all, even if the class copy constructor or destructor have side effects. 3199 3200 // FIXME: Is this enough? 3201 if (Constructor->isCopyConstructor(Context)) { 3202 Expr *E = ((Expr **)ExprArgs.get())[0]; 3203 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3204 E = BE->getSubExpr(); 3205 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3206 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3207 E = ICE->getSubExpr(); 3208 3209 if (isa<CallExpr>(E) || isa<CXXTemporaryObjectExpr>(E)) 3210 Elidable = true; 3211 } 3212 3213 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 3214 Elidable, move(ExprArgs)); 3215} 3216 3217/// BuildCXXConstructExpr - Creates a complete call to a constructor, 3218/// including handling of its default argument expressions. 3219Sema::OwningExprResult 3220Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3221 CXXConstructorDecl *Constructor, bool Elidable, 3222 MultiExprArg ExprArgs) { 3223 unsigned NumExprs = ExprArgs.size(); 3224 Expr **Exprs = (Expr **)ExprArgs.release(); 3225 3226 return Owned(CXXConstructExpr::Create(Context, DeclInitType, Constructor, 3227 Elidable, Exprs, NumExprs)); 3228} 3229 3230Sema::OwningExprResult 3231Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor, 3232 QualType Ty, 3233 SourceLocation TyBeginLoc, 3234 MultiExprArg Args, 3235 SourceLocation RParenLoc) { 3236 unsigned NumExprs = Args.size(); 3237 Expr **Exprs = (Expr **)Args.release(); 3238 3239 return Owned(new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty, 3240 TyBeginLoc, Exprs, 3241 NumExprs, RParenLoc)); 3242} 3243 3244 3245bool Sema::InitializeVarWithConstructor(VarDecl *VD, 3246 CXXConstructorDecl *Constructor, 3247 MultiExprArg Exprs) { 3248 OwningExprResult TempResult = 3249 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 3250 move(Exprs)); 3251 if (TempResult.isInvalid()) 3252 return true; 3253 3254 Expr *Temp = TempResult.takeAs<Expr>(); 3255 MarkDeclarationReferenced(VD->getLocation(), Constructor); 3256 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 3257 VD->setInit(Context, Temp); 3258 3259 return false; 3260} 3261 3262void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) { 3263 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 3264 DeclInitType->getAs<RecordType>()->getDecl()); 3265 if (!ClassDecl->hasTrivialDestructor()) 3266 if (CXXDestructorDecl *Destructor = 3267 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 3268 MarkDeclarationReferenced(VD->getLocation(), Destructor); 3269} 3270 3271/// AddCXXDirectInitializerToDecl - This action is called immediately after 3272/// ActOnDeclarator, when a C++ direct initializer is present. 3273/// e.g: "int x(1);" 3274void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 3275 SourceLocation LParenLoc, 3276 MultiExprArg Exprs, 3277 SourceLocation *CommaLocs, 3278 SourceLocation RParenLoc) { 3279 unsigned NumExprs = Exprs.size(); 3280 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 3281 Decl *RealDecl = Dcl.getAs<Decl>(); 3282 3283 // If there is no declaration, there was an error parsing it. Just ignore 3284 // the initializer. 3285 if (RealDecl == 0) 3286 return; 3287 3288 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3289 if (!VDecl) { 3290 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3291 RealDecl->setInvalidDecl(); 3292 return; 3293 } 3294 3295 // We will represent direct-initialization similarly to copy-initialization: 3296 // int x(1); -as-> int x = 1; 3297 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 3298 // 3299 // Clients that want to distinguish between the two forms, can check for 3300 // direct initializer using VarDecl::hasCXXDirectInitializer(). 3301 // A major benefit is that clients that don't particularly care about which 3302 // exactly form was it (like the CodeGen) can handle both cases without 3303 // special case code. 3304 3305 // If either the declaration has a dependent type or if any of the expressions 3306 // is type-dependent, we represent the initialization via a ParenListExpr for 3307 // later use during template instantiation. 3308 if (VDecl->getType()->isDependentType() || 3309 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 3310 // Let clients know that initialization was done with a direct initializer. 3311 VDecl->setCXXDirectInitializer(true); 3312 3313 // Store the initialization expressions as a ParenListExpr. 3314 unsigned NumExprs = Exprs.size(); 3315 VDecl->setInit(Context, 3316 new (Context) ParenListExpr(Context, LParenLoc, 3317 (Expr **)Exprs.release(), 3318 NumExprs, RParenLoc)); 3319 return; 3320 } 3321 3322 3323 // C++ 8.5p11: 3324 // The form of initialization (using parentheses or '=') is generally 3325 // insignificant, but does matter when the entity being initialized has a 3326 // class type. 3327 QualType DeclInitType = VDecl->getType(); 3328 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 3329 DeclInitType = Context.getBaseElementType(Array); 3330 3331 // FIXME: This isn't the right place to complete the type. 3332 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 3333 diag::err_typecheck_decl_incomplete_type)) { 3334 VDecl->setInvalidDecl(); 3335 return; 3336 } 3337 3338 if (VDecl->getType()->isRecordType()) { 3339 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 3340 3341 CXXConstructorDecl *Constructor 3342 = PerformInitializationByConstructor(DeclInitType, 3343 move(Exprs), 3344 VDecl->getLocation(), 3345 SourceRange(VDecl->getLocation(), 3346 RParenLoc), 3347 VDecl->getDeclName(), 3348 IK_Direct, 3349 ConstructorArgs); 3350 if (!Constructor) 3351 RealDecl->setInvalidDecl(); 3352 else { 3353 VDecl->setCXXDirectInitializer(true); 3354 if (InitializeVarWithConstructor(VDecl, Constructor, 3355 move_arg(ConstructorArgs))) 3356 RealDecl->setInvalidDecl(); 3357 FinalizeVarWithDestructor(VDecl, DeclInitType); 3358 } 3359 return; 3360 } 3361 3362 if (NumExprs > 1) { 3363 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 3364 << SourceRange(VDecl->getLocation(), RParenLoc); 3365 RealDecl->setInvalidDecl(); 3366 return; 3367 } 3368 3369 // Let clients know that initialization was done with a direct initializer. 3370 VDecl->setCXXDirectInitializer(true); 3371 3372 assert(NumExprs == 1 && "Expected 1 expression"); 3373 // Set the init expression, handles conversions. 3374 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 3375 /*DirectInit=*/true); 3376} 3377 3378/// \brief Add the applicable constructor candidates for an initialization 3379/// by constructor. 3380static void AddConstructorInitializationCandidates(Sema &SemaRef, 3381 QualType ClassType, 3382 Expr **Args, 3383 unsigned NumArgs, 3384 Sema::InitializationKind Kind, 3385 OverloadCandidateSet &CandidateSet) { 3386 // C++ [dcl.init]p14: 3387 // If the initialization is direct-initialization, or if it is 3388 // copy-initialization where the cv-unqualified version of the 3389 // source type is the same class as, or a derived class of, the 3390 // class of the destination, constructors are considered. The 3391 // applicable constructors are enumerated (13.3.1.3), and the 3392 // best one is chosen through overload resolution (13.3). The 3393 // constructor so selected is called to initialize the object, 3394 // with the initializer expression(s) as its argument(s). If no 3395 // constructor applies, or the overload resolution is ambiguous, 3396 // the initialization is ill-formed. 3397 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 3398 assert(ClassRec && "Can only initialize a class type here"); 3399 3400 // FIXME: When we decide not to synthesize the implicitly-declared 3401 // constructors, we'll need to make them appear here. 3402 3403 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 3404 DeclarationName ConstructorName 3405 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 3406 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 3407 DeclContext::lookup_const_iterator Con, ConEnd; 3408 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 3409 Con != ConEnd; ++Con) { 3410 // Find the constructor (which may be a template). 3411 CXXConstructorDecl *Constructor = 0; 3412 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 3413 if (ConstructorTmpl) 3414 Constructor 3415 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 3416 else 3417 Constructor = cast<CXXConstructorDecl>(*Con); 3418 3419 if ((Kind == Sema::IK_Direct) || 3420 (Kind == Sema::IK_Copy && 3421 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 3422 (Kind == Sema::IK_Default && Constructor->isDefaultConstructor())) { 3423 if (ConstructorTmpl) 3424 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, false, 0, 0, 3425 Args, NumArgs, CandidateSet); 3426 else 3427 SemaRef.AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 3428 } 3429 } 3430} 3431 3432/// \brief Attempt to perform initialization by constructor 3433/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 3434/// copy-initialization. 3435/// 3436/// This routine determines whether initialization by constructor is possible, 3437/// but it does not emit any diagnostics in the case where the initialization 3438/// is ill-formed. 3439/// 3440/// \param ClassType the type of the object being initialized, which must have 3441/// class type. 3442/// 3443/// \param Args the arguments provided to initialize the object 3444/// 3445/// \param NumArgs the number of arguments provided to initialize the object 3446/// 3447/// \param Kind the type of initialization being performed 3448/// 3449/// \returns the constructor used to initialize the object, if successful. 3450/// Otherwise, emits a diagnostic and returns NULL. 3451CXXConstructorDecl * 3452Sema::TryInitializationByConstructor(QualType ClassType, 3453 Expr **Args, unsigned NumArgs, 3454 SourceLocation Loc, 3455 InitializationKind Kind) { 3456 // Build the overload candidate set 3457 OverloadCandidateSet CandidateSet; 3458 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 3459 CandidateSet); 3460 3461 // Determine whether we found a constructor we can use. 3462 OverloadCandidateSet::iterator Best; 3463 switch (BestViableFunction(CandidateSet, Loc, Best)) { 3464 case OR_Success: 3465 case OR_Deleted: 3466 // We found a constructor. Return it. 3467 return cast<CXXConstructorDecl>(Best->Function); 3468 3469 case OR_No_Viable_Function: 3470 case OR_Ambiguous: 3471 // Overload resolution failed. Return nothing. 3472 return 0; 3473 } 3474 3475 // Silence GCC warning 3476 return 0; 3477} 3478 3479/// \brief Perform initialization by constructor (C++ [dcl.init]p14), which 3480/// may occur as part of direct-initialization or copy-initialization. 3481/// 3482/// \param ClassType the type of the object being initialized, which must have 3483/// class type. 3484/// 3485/// \param ArgsPtr the arguments provided to initialize the object 3486/// 3487/// \param Loc the source location where the initialization occurs 3488/// 3489/// \param Range the source range that covers the entire initialization 3490/// 3491/// \param InitEntity the name of the entity being initialized, if known 3492/// 3493/// \param Kind the type of initialization being performed 3494/// 3495/// \param ConvertedArgs a vector that will be filled in with the 3496/// appropriately-converted arguments to the constructor (if initialization 3497/// succeeded). 3498/// 3499/// \returns the constructor used to initialize the object, if successful. 3500/// Otherwise, emits a diagnostic and returns NULL. 3501CXXConstructorDecl * 3502Sema::PerformInitializationByConstructor(QualType ClassType, 3503 MultiExprArg ArgsPtr, 3504 SourceLocation Loc, SourceRange Range, 3505 DeclarationName InitEntity, 3506 InitializationKind Kind, 3507 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3508 3509 // Build the overload candidate set 3510 Expr **Args = (Expr **)ArgsPtr.get(); 3511 unsigned NumArgs = ArgsPtr.size(); 3512 OverloadCandidateSet CandidateSet; 3513 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 3514 CandidateSet); 3515 3516 OverloadCandidateSet::iterator Best; 3517 switch (BestViableFunction(CandidateSet, Loc, Best)) { 3518 case OR_Success: 3519 // We found a constructor. Break out so that we can convert the arguments 3520 // appropriately. 3521 break; 3522 3523 case OR_No_Viable_Function: 3524 if (InitEntity) 3525 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3526 << InitEntity << Range; 3527 else 3528 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3529 << ClassType << Range; 3530 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 3531 return 0; 3532 3533 case OR_Ambiguous: 3534 if (InitEntity) 3535 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 3536 else 3537 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 3538 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3539 return 0; 3540 3541 case OR_Deleted: 3542 if (InitEntity) 3543 Diag(Loc, diag::err_ovl_deleted_init) 3544 << Best->Function->isDeleted() 3545 << InitEntity << Range; 3546 else 3547 Diag(Loc, diag::err_ovl_deleted_init) 3548 << Best->Function->isDeleted() 3549 << InitEntity << Range; 3550 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3551 return 0; 3552 } 3553 3554 // Convert the arguments, fill in default arguments, etc. 3555 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function); 3556 if (CompleteConstructorCall(Constructor, move(ArgsPtr), Loc, ConvertedArgs)) 3557 return 0; 3558 3559 return Constructor; 3560} 3561 3562/// \brief Given a constructor and the set of arguments provided for the 3563/// constructor, convert the arguments and add any required default arguments 3564/// to form a proper call to this constructor. 3565/// 3566/// \returns true if an error occurred, false otherwise. 3567bool 3568Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 3569 MultiExprArg ArgsPtr, 3570 SourceLocation Loc, 3571 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3572 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 3573 unsigned NumArgs = ArgsPtr.size(); 3574 Expr **Args = (Expr **)ArgsPtr.get(); 3575 3576 const FunctionProtoType *Proto 3577 = Constructor->getType()->getAs<FunctionProtoType>(); 3578 assert(Proto && "Constructor without a prototype?"); 3579 unsigned NumArgsInProto = Proto->getNumArgs(); 3580 unsigned NumArgsToCheck = NumArgs; 3581 3582 // If too few arguments are available, we'll fill in the rest with defaults. 3583 if (NumArgs < NumArgsInProto) { 3584 NumArgsToCheck = NumArgsInProto; 3585 ConvertedArgs.reserve(NumArgsInProto); 3586 } else { 3587 ConvertedArgs.reserve(NumArgs); 3588 if (NumArgs > NumArgsInProto) 3589 NumArgsToCheck = NumArgsInProto; 3590 } 3591 3592 // Convert arguments 3593 for (unsigned i = 0; i != NumArgsToCheck; i++) { 3594 QualType ProtoArgType = Proto->getArgType(i); 3595 3596 Expr *Arg; 3597 if (i < NumArgs) { 3598 Arg = Args[i]; 3599 3600 // Pass the argument. 3601 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 3602 return true; 3603 3604 Args[i] = 0; 3605 } else { 3606 ParmVarDecl *Param = Constructor->getParamDecl(i); 3607 3608 OwningExprResult DefArg = BuildCXXDefaultArgExpr(Loc, Constructor, Param); 3609 if (DefArg.isInvalid()) 3610 return true; 3611 3612 Arg = DefArg.takeAs<Expr>(); 3613 } 3614 3615 ConvertedArgs.push_back(Arg); 3616 } 3617 3618 // If this is a variadic call, handle args passed through "...". 3619 if (Proto->isVariadic()) { 3620 // Promote the arguments (C99 6.5.2.2p7). 3621 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 3622 Expr *Arg = Args[i]; 3623 if (DefaultVariadicArgumentPromotion(Arg, VariadicConstructor)) 3624 return true; 3625 3626 ConvertedArgs.push_back(Arg); 3627 Args[i] = 0; 3628 } 3629 } 3630 3631 return false; 3632} 3633 3634/// CompareReferenceRelationship - Compare the two types T1 and T2 to 3635/// determine whether they are reference-related, 3636/// reference-compatible, reference-compatible with added 3637/// qualification, or incompatible, for use in C++ initialization by 3638/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 3639/// type, and the first type (T1) is the pointee type of the reference 3640/// type being initialized. 3641Sema::ReferenceCompareResult 3642Sema::CompareReferenceRelationship(SourceLocation Loc, 3643 QualType OrigT1, QualType OrigT2, 3644 bool& DerivedToBase) { 3645 assert(!OrigT1->isReferenceType() && 3646 "T1 must be the pointee type of the reference type"); 3647 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 3648 3649 QualType T1 = Context.getCanonicalType(OrigT1); 3650 QualType T2 = Context.getCanonicalType(OrigT2); 3651 QualType UnqualT1 = T1.getLocalUnqualifiedType(); 3652 QualType UnqualT2 = T2.getLocalUnqualifiedType(); 3653 3654 // C++ [dcl.init.ref]p4: 3655 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 3656 // reference-related to "cv2 T2" if T1 is the same type as T2, or 3657 // T1 is a base class of T2. 3658 if (UnqualT1 == UnqualT2) 3659 DerivedToBase = false; 3660 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 3661 !RequireCompleteType(Loc, OrigT2, PDiag()) && 3662 IsDerivedFrom(UnqualT2, UnqualT1)) 3663 DerivedToBase = true; 3664 else 3665 return Ref_Incompatible; 3666 3667 // At this point, we know that T1 and T2 are reference-related (at 3668 // least). 3669 3670 // C++ [dcl.init.ref]p4: 3671 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 3672 // reference-related to T2 and cv1 is the same cv-qualification 3673 // as, or greater cv-qualification than, cv2. For purposes of 3674 // overload resolution, cases for which cv1 is greater 3675 // cv-qualification than cv2 are identified as 3676 // reference-compatible with added qualification (see 13.3.3.2). 3677 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 3678 return Ref_Compatible; 3679 else if (T1.isMoreQualifiedThan(T2)) 3680 return Ref_Compatible_With_Added_Qualification; 3681 else 3682 return Ref_Related; 3683} 3684 3685/// CheckReferenceInit - Check the initialization of a reference 3686/// variable with the given initializer (C++ [dcl.init.ref]). Init is 3687/// the initializer (either a simple initializer or an initializer 3688/// list), and DeclType is the type of the declaration. When ICS is 3689/// non-null, this routine will compute the implicit conversion 3690/// sequence according to C++ [over.ics.ref] and will not produce any 3691/// diagnostics; when ICS is null, it will emit diagnostics when any 3692/// errors are found. Either way, a return value of true indicates 3693/// that there was a failure, a return value of false indicates that 3694/// the reference initialization succeeded. 3695/// 3696/// When @p SuppressUserConversions, user-defined conversions are 3697/// suppressed. 3698/// When @p AllowExplicit, we also permit explicit user-defined 3699/// conversion functions. 3700/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 3701/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 3702/// This is used when this is called from a C-style cast. 3703bool 3704Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 3705 SourceLocation DeclLoc, 3706 bool SuppressUserConversions, 3707 bool AllowExplicit, bool ForceRValue, 3708 ImplicitConversionSequence *ICS, 3709 bool IgnoreBaseAccess) { 3710 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 3711 3712 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 3713 QualType T2 = Init->getType(); 3714 3715 // If the initializer is the address of an overloaded function, try 3716 // to resolve the overloaded function. If all goes well, T2 is the 3717 // type of the resulting function. 3718 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 3719 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 3720 ICS != 0); 3721 if (Fn) { 3722 // Since we're performing this reference-initialization for 3723 // real, update the initializer with the resulting function. 3724 if (!ICS) { 3725 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 3726 return true; 3727 3728 Init = FixOverloadedFunctionReference(Init, Fn); 3729 } 3730 3731 T2 = Fn->getType(); 3732 } 3733 } 3734 3735 // Compute some basic properties of the types and the initializer. 3736 bool isRValRef = DeclType->isRValueReferenceType(); 3737 bool DerivedToBase = false; 3738 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 3739 Init->isLvalue(Context); 3740 ReferenceCompareResult RefRelationship 3741 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 3742 3743 // Most paths end in a failed conversion. 3744 if (ICS) 3745 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 3746 3747 // C++ [dcl.init.ref]p5: 3748 // A reference to type "cv1 T1" is initialized by an expression 3749 // of type "cv2 T2" as follows: 3750 3751 // -- If the initializer expression 3752 3753 // Rvalue references cannot bind to lvalues (N2812). 3754 // There is absolutely no situation where they can. In particular, note that 3755 // this is ill-formed, even if B has a user-defined conversion to A&&: 3756 // B b; 3757 // A&& r = b; 3758 if (isRValRef && InitLvalue == Expr::LV_Valid) { 3759 if (!ICS) 3760 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 3761 << Init->getSourceRange(); 3762 return true; 3763 } 3764 3765 bool BindsDirectly = false; 3766 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 3767 // reference-compatible with "cv2 T2," or 3768 // 3769 // Note that the bit-field check is skipped if we are just computing 3770 // the implicit conversion sequence (C++ [over.best.ics]p2). 3771 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 3772 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 3773 BindsDirectly = true; 3774 3775 if (ICS) { 3776 // C++ [over.ics.ref]p1: 3777 // When a parameter of reference type binds directly (8.5.3) 3778 // to an argument expression, the implicit conversion sequence 3779 // is the identity conversion, unless the argument expression 3780 // has a type that is a derived class of the parameter type, 3781 // in which case the implicit conversion sequence is a 3782 // derived-to-base Conversion (13.3.3.1). 3783 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 3784 ICS->Standard.First = ICK_Identity; 3785 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3786 ICS->Standard.Third = ICK_Identity; 3787 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3788 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3789 ICS->Standard.ReferenceBinding = true; 3790 ICS->Standard.DirectBinding = true; 3791 ICS->Standard.RRefBinding = false; 3792 ICS->Standard.CopyConstructor = 0; 3793 3794 // Nothing more to do: the inaccessibility/ambiguity check for 3795 // derived-to-base conversions is suppressed when we're 3796 // computing the implicit conversion sequence (C++ 3797 // [over.best.ics]p2). 3798 return false; 3799 } else { 3800 // Perform the conversion. 3801 CastExpr::CastKind CK = CastExpr::CK_NoOp; 3802 if (DerivedToBase) 3803 CK = CastExpr::CK_DerivedToBase; 3804 else if(CheckExceptionSpecCompatibility(Init, T1)) 3805 return true; 3806 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 3807 } 3808 } 3809 3810 // -- has a class type (i.e., T2 is a class type) and can be 3811 // implicitly converted to an lvalue of type "cv3 T3," 3812 // where "cv1 T1" is reference-compatible with "cv3 T3" 3813 // 92) (this conversion is selected by enumerating the 3814 // applicable conversion functions (13.3.1.6) and choosing 3815 // the best one through overload resolution (13.3)), 3816 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 3817 !RequireCompleteType(DeclLoc, T2, 0)) { 3818 CXXRecordDecl *T2RecordDecl 3819 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 3820 3821 OverloadCandidateSet CandidateSet; 3822 OverloadedFunctionDecl *Conversions 3823 = T2RecordDecl->getVisibleConversionFunctions(); 3824 for (OverloadedFunctionDecl::function_iterator Func 3825 = Conversions->function_begin(); 3826 Func != Conversions->function_end(); ++Func) { 3827 FunctionTemplateDecl *ConvTemplate 3828 = dyn_cast<FunctionTemplateDecl>(*Func); 3829 CXXConversionDecl *Conv; 3830 if (ConvTemplate) 3831 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 3832 else 3833 Conv = cast<CXXConversionDecl>(*Func); 3834 3835 // If the conversion function doesn't return a reference type, 3836 // it can't be considered for this conversion. 3837 if (Conv->getConversionType()->isLValueReferenceType() && 3838 (AllowExplicit || !Conv->isExplicit())) { 3839 if (ConvTemplate) 3840 AddTemplateConversionCandidate(ConvTemplate, Init, DeclType, 3841 CandidateSet); 3842 else 3843 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 3844 } 3845 } 3846 3847 OverloadCandidateSet::iterator Best; 3848 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 3849 case OR_Success: 3850 // This is a direct binding. 3851 BindsDirectly = true; 3852 3853 if (ICS) { 3854 // C++ [over.ics.ref]p1: 3855 // 3856 // [...] If the parameter binds directly to the result of 3857 // applying a conversion function to the argument 3858 // expression, the implicit conversion sequence is a 3859 // user-defined conversion sequence (13.3.3.1.2), with the 3860 // second standard conversion sequence either an identity 3861 // conversion or, if the conversion function returns an 3862 // entity of a type that is a derived class of the parameter 3863 // type, a derived-to-base Conversion. 3864 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 3865 ICS->UserDefined.Before = Best->Conversions[0].Standard; 3866 ICS->UserDefined.After = Best->FinalConversion; 3867 ICS->UserDefined.ConversionFunction = Best->Function; 3868 ICS->UserDefined.EllipsisConversion = false; 3869 assert(ICS->UserDefined.After.ReferenceBinding && 3870 ICS->UserDefined.After.DirectBinding && 3871 "Expected a direct reference binding!"); 3872 return false; 3873 } else { 3874 OwningExprResult InitConversion = 3875 BuildCXXCastArgument(DeclLoc, QualType(), 3876 CastExpr::CK_UserDefinedConversion, 3877 cast<CXXMethodDecl>(Best->Function), 3878 Owned(Init)); 3879 Init = InitConversion.takeAs<Expr>(); 3880 3881 if (CheckExceptionSpecCompatibility(Init, T1)) 3882 return true; 3883 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 3884 /*isLvalue=*/true); 3885 } 3886 break; 3887 3888 case OR_Ambiguous: 3889 if (ICS) { 3890 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 3891 Cand != CandidateSet.end(); ++Cand) 3892 if (Cand->Viable) 3893 ICS->ConversionFunctionSet.push_back(Cand->Function); 3894 break; 3895 } 3896 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 3897 << Init->getSourceRange(); 3898 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3899 return true; 3900 3901 case OR_No_Viable_Function: 3902 case OR_Deleted: 3903 // There was no suitable conversion, or we found a deleted 3904 // conversion; continue with other checks. 3905 break; 3906 } 3907 } 3908 3909 if (BindsDirectly) { 3910 // C++ [dcl.init.ref]p4: 3911 // [...] In all cases where the reference-related or 3912 // reference-compatible relationship of two types is used to 3913 // establish the validity of a reference binding, and T1 is a 3914 // base class of T2, a program that necessitates such a binding 3915 // is ill-formed if T1 is an inaccessible (clause 11) or 3916 // ambiguous (10.2) base class of T2. 3917 // 3918 // Note that we only check this condition when we're allowed to 3919 // complain about errors, because we should not be checking for 3920 // ambiguity (or inaccessibility) unless the reference binding 3921 // actually happens. 3922 if (DerivedToBase) 3923 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 3924 Init->getSourceRange(), 3925 IgnoreBaseAccess); 3926 else 3927 return false; 3928 } 3929 3930 // -- Otherwise, the reference shall be to a non-volatile const 3931 // type (i.e., cv1 shall be const), or the reference shall be an 3932 // rvalue reference and the initializer expression shall be an rvalue. 3933 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 3934 if (!ICS) 3935 Diag(DeclLoc, diag::err_not_reference_to_const_init) 3936 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 3937 << T2 << Init->getSourceRange(); 3938 return true; 3939 } 3940 3941 // -- If the initializer expression is an rvalue, with T2 a 3942 // class type, and "cv1 T1" is reference-compatible with 3943 // "cv2 T2," the reference is bound in one of the 3944 // following ways (the choice is implementation-defined): 3945 // 3946 // -- The reference is bound to the object represented by 3947 // the rvalue (see 3.10) or to a sub-object within that 3948 // object. 3949 // 3950 // -- A temporary of type "cv1 T2" [sic] is created, and 3951 // a constructor is called to copy the entire rvalue 3952 // object into the temporary. The reference is bound to 3953 // the temporary or to a sub-object within the 3954 // temporary. 3955 // 3956 // The constructor that would be used to make the copy 3957 // shall be callable whether or not the copy is actually 3958 // done. 3959 // 3960 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 3961 // freedom, so we will always take the first option and never build 3962 // a temporary in this case. FIXME: We will, however, have to check 3963 // for the presence of a copy constructor in C++98/03 mode. 3964 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 3965 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 3966 if (ICS) { 3967 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 3968 ICS->Standard.First = ICK_Identity; 3969 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3970 ICS->Standard.Third = ICK_Identity; 3971 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3972 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3973 ICS->Standard.ReferenceBinding = true; 3974 ICS->Standard.DirectBinding = false; 3975 ICS->Standard.RRefBinding = isRValRef; 3976 ICS->Standard.CopyConstructor = 0; 3977 } else { 3978 CastExpr::CastKind CK = CastExpr::CK_NoOp; 3979 if (DerivedToBase) 3980 CK = CastExpr::CK_DerivedToBase; 3981 else if(CheckExceptionSpecCompatibility(Init, T1)) 3982 return true; 3983 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 3984 } 3985 return false; 3986 } 3987 3988 // -- Otherwise, a temporary of type "cv1 T1" is created and 3989 // initialized from the initializer expression using the 3990 // rules for a non-reference copy initialization (8.5). The 3991 // reference is then bound to the temporary. If T1 is 3992 // reference-related to T2, cv1 must be the same 3993 // cv-qualification as, or greater cv-qualification than, 3994 // cv2; otherwise, the program is ill-formed. 3995 if (RefRelationship == Ref_Related) { 3996 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 3997 // we would be reference-compatible or reference-compatible with 3998 // added qualification. But that wasn't the case, so the reference 3999 // initialization fails. 4000 if (!ICS) 4001 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4002 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 4003 << T2 << Init->getSourceRange(); 4004 return true; 4005 } 4006 4007 // If at least one of the types is a class type, the types are not 4008 // related, and we aren't allowed any user conversions, the 4009 // reference binding fails. This case is important for breaking 4010 // recursion, since TryImplicitConversion below will attempt to 4011 // create a temporary through the use of a copy constructor. 4012 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4013 (T1->isRecordType() || T2->isRecordType())) { 4014 if (!ICS) 4015 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4016 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 4017 return true; 4018 } 4019 4020 // Actually try to convert the initializer to T1. 4021 if (ICS) { 4022 // C++ [over.ics.ref]p2: 4023 // 4024 // When a parameter of reference type is not bound directly to 4025 // an argument expression, the conversion sequence is the one 4026 // required to convert the argument expression to the 4027 // underlying type of the reference according to 4028 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4029 // to copy-initializing a temporary of the underlying type with 4030 // the argument expression. Any difference in top-level 4031 // cv-qualification is subsumed by the initialization itself 4032 // and does not constitute a conversion. 4033 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4034 /*AllowExplicit=*/false, 4035 /*ForceRValue=*/false, 4036 /*InOverloadResolution=*/false); 4037 4038 // Of course, that's still a reference binding. 4039 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 4040 ICS->Standard.ReferenceBinding = true; 4041 ICS->Standard.RRefBinding = isRValRef; 4042 } else if (ICS->ConversionKind == 4043 ImplicitConversionSequence::UserDefinedConversion) { 4044 ICS->UserDefined.After.ReferenceBinding = true; 4045 ICS->UserDefined.After.RRefBinding = isRValRef; 4046 } 4047 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 4048 } else { 4049 ImplicitConversionSequence Conversions; 4050 bool badConversion = PerformImplicitConversion(Init, T1, "initializing", 4051 false, false, 4052 Conversions); 4053 if (badConversion) { 4054 if ((Conversions.ConversionKind == 4055 ImplicitConversionSequence::BadConversion) 4056 && !Conversions.ConversionFunctionSet.empty()) { 4057 Diag(DeclLoc, 4058 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4059 for (int j = Conversions.ConversionFunctionSet.size()-1; 4060 j >= 0; j--) { 4061 FunctionDecl *Func = Conversions.ConversionFunctionSet[j]; 4062 Diag(Func->getLocation(), diag::err_ovl_candidate); 4063 } 4064 } 4065 else { 4066 if (isRValRef) 4067 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4068 << Init->getSourceRange(); 4069 else 4070 Diag(DeclLoc, diag::err_invalid_initialization) 4071 << DeclType << Init->getType() << Init->getSourceRange(); 4072 } 4073 } 4074 return badConversion; 4075 } 4076} 4077 4078/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4079/// of this overloaded operator is well-formed. If so, returns false; 4080/// otherwise, emits appropriate diagnostics and returns true. 4081bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4082 assert(FnDecl && FnDecl->isOverloadedOperator() && 4083 "Expected an overloaded operator declaration"); 4084 4085 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4086 4087 // C++ [over.oper]p5: 4088 // The allocation and deallocation functions, operator new, 4089 // operator new[], operator delete and operator delete[], are 4090 // described completely in 3.7.3. The attributes and restrictions 4091 // found in the rest of this subclause do not apply to them unless 4092 // explicitly stated in 3.7.3. 4093 // FIXME: Write a separate routine for checking this. For now, just allow it. 4094 if (Op == OO_Delete || Op == OO_Array_Delete) 4095 return false; 4096 4097 if (Op == OO_New || Op == OO_Array_New) { 4098 bool ret = false; 4099 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 4100 QualType SizeTy = Context.getCanonicalType(Context.getSizeType()); 4101 QualType T = Context.getCanonicalType((*Param)->getType()); 4102 if (!T->isDependentType() && SizeTy != T) { 4103 Diag(FnDecl->getLocation(), 4104 diag::err_operator_new_param_type) << FnDecl->getDeclName() 4105 << SizeTy; 4106 ret = true; 4107 } 4108 } 4109 QualType ResultTy = Context.getCanonicalType(FnDecl->getResultType()); 4110 if (!ResultTy->isDependentType() && ResultTy != Context.VoidPtrTy) 4111 return Diag(FnDecl->getLocation(), 4112 diag::err_operator_new_result_type) << FnDecl->getDeclName() 4113 << static_cast<QualType>(Context.VoidPtrTy); 4114 return ret; 4115 } 4116 4117 // C++ [over.oper]p6: 4118 // An operator function shall either be a non-static member 4119 // function or be a non-member function and have at least one 4120 // parameter whose type is a class, a reference to a class, an 4121 // enumeration, or a reference to an enumeration. 4122 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4123 if (MethodDecl->isStatic()) 4124 return Diag(FnDecl->getLocation(), 4125 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4126 } else { 4127 bool ClassOrEnumParam = false; 4128 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4129 ParamEnd = FnDecl->param_end(); 4130 Param != ParamEnd; ++Param) { 4131 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4132 if (ParamType->isDependentType() || ParamType->isRecordType() || 4133 ParamType->isEnumeralType()) { 4134 ClassOrEnumParam = true; 4135 break; 4136 } 4137 } 4138 4139 if (!ClassOrEnumParam) 4140 return Diag(FnDecl->getLocation(), 4141 diag::err_operator_overload_needs_class_or_enum) 4142 << FnDecl->getDeclName(); 4143 } 4144 4145 // C++ [over.oper]p8: 4146 // An operator function cannot have default arguments (8.3.6), 4147 // except where explicitly stated below. 4148 // 4149 // Only the function-call operator allows default arguments 4150 // (C++ [over.call]p1). 4151 if (Op != OO_Call) { 4152 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4153 Param != FnDecl->param_end(); ++Param) { 4154 if ((*Param)->hasUnparsedDefaultArg()) 4155 return Diag((*Param)->getLocation(), 4156 diag::err_operator_overload_default_arg) 4157 << FnDecl->getDeclName(); 4158 else if (Expr *DefArg = (*Param)->getDefaultArg()) 4159 return Diag((*Param)->getLocation(), 4160 diag::err_operator_overload_default_arg) 4161 << FnDecl->getDeclName() << DefArg->getSourceRange(); 4162 } 4163 } 4164 4165 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4166 { false, false, false } 4167#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4168 , { Unary, Binary, MemberOnly } 4169#include "clang/Basic/OperatorKinds.def" 4170 }; 4171 4172 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4173 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4174 bool MustBeMemberOperator = OperatorUses[Op][2]; 4175 4176 // C++ [over.oper]p8: 4177 // [...] Operator functions cannot have more or fewer parameters 4178 // than the number required for the corresponding operator, as 4179 // described in the rest of this subclause. 4180 unsigned NumParams = FnDecl->getNumParams() 4181 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4182 if (Op != OO_Call && 4183 ((NumParams == 1 && !CanBeUnaryOperator) || 4184 (NumParams == 2 && !CanBeBinaryOperator) || 4185 (NumParams < 1) || (NumParams > 2))) { 4186 // We have the wrong number of parameters. 4187 unsigned ErrorKind; 4188 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4189 ErrorKind = 2; // 2 -> unary or binary. 4190 } else if (CanBeUnaryOperator) { 4191 ErrorKind = 0; // 0 -> unary 4192 } else { 4193 assert(CanBeBinaryOperator && 4194 "All non-call overloaded operators are unary or binary!"); 4195 ErrorKind = 1; // 1 -> binary 4196 } 4197 4198 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4199 << FnDecl->getDeclName() << NumParams << ErrorKind; 4200 } 4201 4202 // Overloaded operators other than operator() cannot be variadic. 4203 if (Op != OO_Call && 4204 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4205 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4206 << FnDecl->getDeclName(); 4207 } 4208 4209 // Some operators must be non-static member functions. 4210 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4211 return Diag(FnDecl->getLocation(), 4212 diag::err_operator_overload_must_be_member) 4213 << FnDecl->getDeclName(); 4214 } 4215 4216 // C++ [over.inc]p1: 4217 // The user-defined function called operator++ implements the 4218 // prefix and postfix ++ operator. If this function is a member 4219 // function with no parameters, or a non-member function with one 4220 // parameter of class or enumeration type, it defines the prefix 4221 // increment operator ++ for objects of that type. If the function 4222 // is a member function with one parameter (which shall be of type 4223 // int) or a non-member function with two parameters (the second 4224 // of which shall be of type int), it defines the postfix 4225 // increment operator ++ for objects of that type. 4226 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4227 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4228 bool ParamIsInt = false; 4229 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4230 ParamIsInt = BT->getKind() == BuiltinType::Int; 4231 4232 if (!ParamIsInt) 4233 return Diag(LastParam->getLocation(), 4234 diag::err_operator_overload_post_incdec_must_be_int) 4235 << LastParam->getType() << (Op == OO_MinusMinus); 4236 } 4237 4238 // Notify the class if it got an assignment operator. 4239 if (Op == OO_Equal) { 4240 // Would have returned earlier otherwise. 4241 assert(isa<CXXMethodDecl>(FnDecl) && 4242 "Overloaded = not member, but not filtered."); 4243 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4244 Method->getParent()->addedAssignmentOperator(Context, Method); 4245 } 4246 4247 return false; 4248} 4249 4250/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4251/// linkage specification, including the language and (if present) 4252/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4253/// the location of the language string literal, which is provided 4254/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4255/// the '{' brace. Otherwise, this linkage specification does not 4256/// have any braces. 4257Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4258 SourceLocation ExternLoc, 4259 SourceLocation LangLoc, 4260 const char *Lang, 4261 unsigned StrSize, 4262 SourceLocation LBraceLoc) { 4263 LinkageSpecDecl::LanguageIDs Language; 4264 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4265 Language = LinkageSpecDecl::lang_c; 4266 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4267 Language = LinkageSpecDecl::lang_cxx; 4268 else { 4269 Diag(LangLoc, diag::err_bad_language); 4270 return DeclPtrTy(); 4271 } 4272 4273 // FIXME: Add all the various semantics of linkage specifications 4274 4275 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4276 LangLoc, Language, 4277 LBraceLoc.isValid()); 4278 CurContext->addDecl(D); 4279 PushDeclContext(S, D); 4280 return DeclPtrTy::make(D); 4281} 4282 4283/// ActOnFinishLinkageSpecification - Completely the definition of 4284/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4285/// valid, it's the position of the closing '}' brace in a linkage 4286/// specification that uses braces. 4287Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4288 DeclPtrTy LinkageSpec, 4289 SourceLocation RBraceLoc) { 4290 if (LinkageSpec) 4291 PopDeclContext(); 4292 return LinkageSpec; 4293} 4294 4295/// \brief Perform semantic analysis for the variable declaration that 4296/// occurs within a C++ catch clause, returning the newly-created 4297/// variable. 4298VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4299 DeclaratorInfo *DInfo, 4300 IdentifierInfo *Name, 4301 SourceLocation Loc, 4302 SourceRange Range) { 4303 bool Invalid = false; 4304 4305 // Arrays and functions decay. 4306 if (ExDeclType->isArrayType()) 4307 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4308 else if (ExDeclType->isFunctionType()) 4309 ExDeclType = Context.getPointerType(ExDeclType); 4310 4311 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4312 // The exception-declaration shall not denote a pointer or reference to an 4313 // incomplete type, other than [cv] void*. 4314 // N2844 forbids rvalue references. 4315 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4316 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4317 Invalid = true; 4318 } 4319 4320 QualType BaseType = ExDeclType; 4321 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 4322 unsigned DK = diag::err_catch_incomplete; 4323 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 4324 BaseType = Ptr->getPointeeType(); 4325 Mode = 1; 4326 DK = diag::err_catch_incomplete_ptr; 4327 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 4328 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 4329 BaseType = Ref->getPointeeType(); 4330 Mode = 2; 4331 DK = diag::err_catch_incomplete_ref; 4332 } 4333 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 4334 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 4335 Invalid = true; 4336 4337 if (!Invalid && !ExDeclType->isDependentType() && 4338 RequireNonAbstractType(Loc, ExDeclType, 4339 diag::err_abstract_type_in_decl, 4340 AbstractVariableType)) 4341 Invalid = true; 4342 4343 // FIXME: Need to test for ability to copy-construct and destroy the 4344 // exception variable. 4345 4346 // FIXME: Need to check for abstract classes. 4347 4348 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 4349 Name, ExDeclType, DInfo, VarDecl::None); 4350 4351 if (Invalid) 4352 ExDecl->setInvalidDecl(); 4353 4354 return ExDecl; 4355} 4356 4357/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 4358/// handler. 4359Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 4360 DeclaratorInfo *DInfo = 0; 4361 QualType ExDeclType = GetTypeForDeclarator(D, S, &DInfo); 4362 4363 bool Invalid = D.isInvalidType(); 4364 IdentifierInfo *II = D.getIdentifier(); 4365 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 4366 // The scope should be freshly made just for us. There is just no way 4367 // it contains any previous declaration. 4368 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 4369 if (PrevDecl->isTemplateParameter()) { 4370 // Maybe we will complain about the shadowed template parameter. 4371 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4372 } 4373 } 4374 4375 if (D.getCXXScopeSpec().isSet() && !Invalid) { 4376 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 4377 << D.getCXXScopeSpec().getRange(); 4378 Invalid = true; 4379 } 4380 4381 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, DInfo, 4382 D.getIdentifier(), 4383 D.getIdentifierLoc(), 4384 D.getDeclSpec().getSourceRange()); 4385 4386 if (Invalid) 4387 ExDecl->setInvalidDecl(); 4388 4389 // Add the exception declaration into this scope. 4390 if (II) 4391 PushOnScopeChains(ExDecl, S); 4392 else 4393 CurContext->addDecl(ExDecl); 4394 4395 ProcessDeclAttributes(S, ExDecl, D); 4396 return DeclPtrTy::make(ExDecl); 4397} 4398 4399Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 4400 ExprArg assertexpr, 4401 ExprArg assertmessageexpr) { 4402 Expr *AssertExpr = (Expr *)assertexpr.get(); 4403 StringLiteral *AssertMessage = 4404 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 4405 4406 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 4407 llvm::APSInt Value(32); 4408 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 4409 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 4410 AssertExpr->getSourceRange(); 4411 return DeclPtrTy(); 4412 } 4413 4414 if (Value == 0) { 4415 std::string str(AssertMessage->getStrData(), 4416 AssertMessage->getByteLength()); 4417 Diag(AssertLoc, diag::err_static_assert_failed) 4418 << str << AssertExpr->getSourceRange(); 4419 } 4420 } 4421 4422 assertexpr.release(); 4423 assertmessageexpr.release(); 4424 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 4425 AssertExpr, AssertMessage); 4426 4427 CurContext->addDecl(Decl); 4428 return DeclPtrTy::make(Decl); 4429} 4430 4431/// Handle a friend type declaration. This works in tandem with 4432/// ActOnTag. 4433/// 4434/// Notes on friend class templates: 4435/// 4436/// We generally treat friend class declarations as if they were 4437/// declaring a class. So, for example, the elaborated type specifier 4438/// in a friend declaration is required to obey the restrictions of a 4439/// class-head (i.e. no typedefs in the scope chain), template 4440/// parameters are required to match up with simple template-ids, &c. 4441/// However, unlike when declaring a template specialization, it's 4442/// okay to refer to a template specialization without an empty 4443/// template parameter declaration, e.g. 4444/// friend class A<T>::B<unsigned>; 4445/// We permit this as a special case; if there are any template 4446/// parameters present at all, require proper matching, i.e. 4447/// template <> template <class T> friend class A<int>::B; 4448Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 4449 MultiTemplateParamsArg TempParams) { 4450 SourceLocation Loc = DS.getSourceRange().getBegin(); 4451 4452 assert(DS.isFriendSpecified()); 4453 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4454 4455 // Try to convert the decl specifier to a type. This works for 4456 // friend templates because ActOnTag never produces a ClassTemplateDecl 4457 // for a TUK_Friend. 4458 Declarator TheDeclarator(DS, Declarator::MemberContext); 4459 QualType T = GetTypeForDeclarator(TheDeclarator, S); 4460 if (TheDeclarator.isInvalidType()) 4461 return DeclPtrTy(); 4462 4463 // This is definitely an error in C++98. It's probably meant to 4464 // be forbidden in C++0x, too, but the specification is just 4465 // poorly written. 4466 // 4467 // The problem is with declarations like the following: 4468 // template <T> friend A<T>::foo; 4469 // where deciding whether a class C is a friend or not now hinges 4470 // on whether there exists an instantiation of A that causes 4471 // 'foo' to equal C. There are restrictions on class-heads 4472 // (which we declare (by fiat) elaborated friend declarations to 4473 // be) that makes this tractable. 4474 // 4475 // FIXME: handle "template <> friend class A<T>;", which 4476 // is possibly well-formed? Who even knows? 4477 if (TempParams.size() && !isa<ElaboratedType>(T)) { 4478 Diag(Loc, diag::err_tagless_friend_type_template) 4479 << DS.getSourceRange(); 4480 return DeclPtrTy(); 4481 } 4482 4483 // C++ [class.friend]p2: 4484 // An elaborated-type-specifier shall be used in a friend declaration 4485 // for a class.* 4486 // * The class-key of the elaborated-type-specifier is required. 4487 // This is one of the rare places in Clang where it's legitimate to 4488 // ask about the "spelling" of the type. 4489 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 4490 // If we evaluated the type to a record type, suggest putting 4491 // a tag in front. 4492 if (const RecordType *RT = T->getAs<RecordType>()) { 4493 RecordDecl *RD = RT->getDecl(); 4494 4495 std::string InsertionText = std::string(" ") + RD->getKindName(); 4496 4497 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 4498 << (unsigned) RD->getTagKind() 4499 << T 4500 << SourceRange(DS.getFriendSpecLoc()) 4501 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 4502 InsertionText); 4503 return DeclPtrTy(); 4504 }else { 4505 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 4506 << DS.getSourceRange(); 4507 return DeclPtrTy(); 4508 } 4509 } 4510 4511 // Enum types cannot be friends. 4512 if (T->getAs<EnumType>()) { 4513 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 4514 << SourceRange(DS.getFriendSpecLoc()); 4515 return DeclPtrTy(); 4516 } 4517 4518 // C++98 [class.friend]p1: A friend of a class is a function 4519 // or class that is not a member of the class . . . 4520 // But that's a silly restriction which nobody implements for 4521 // inner classes, and C++0x removes it anyway, so we only report 4522 // this (as a warning) if we're being pedantic. 4523 if (!getLangOptions().CPlusPlus0x) 4524 if (const RecordType *RT = T->getAs<RecordType>()) 4525 if (RT->getDecl()->getDeclContext() == CurContext) 4526 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 4527 4528 Decl *D; 4529 if (TempParams.size()) 4530 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 4531 TempParams.size(), 4532 (TemplateParameterList**) TempParams.release(), 4533 T.getTypePtr(), 4534 DS.getFriendSpecLoc()); 4535 else 4536 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 4537 DS.getFriendSpecLoc()); 4538 D->setAccess(AS_public); 4539 CurContext->addDecl(D); 4540 4541 return DeclPtrTy::make(D); 4542} 4543 4544Sema::DeclPtrTy 4545Sema::ActOnFriendFunctionDecl(Scope *S, 4546 Declarator &D, 4547 bool IsDefinition, 4548 MultiTemplateParamsArg TemplateParams) { 4549 const DeclSpec &DS = D.getDeclSpec(); 4550 4551 assert(DS.isFriendSpecified()); 4552 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4553 4554 SourceLocation Loc = D.getIdentifierLoc(); 4555 DeclaratorInfo *DInfo = 0; 4556 QualType T = GetTypeForDeclarator(D, S, &DInfo); 4557 4558 // C++ [class.friend]p1 4559 // A friend of a class is a function or class.... 4560 // Note that this sees through typedefs, which is intended. 4561 // It *doesn't* see through dependent types, which is correct 4562 // according to [temp.arg.type]p3: 4563 // If a declaration acquires a function type through a 4564 // type dependent on a template-parameter and this causes 4565 // a declaration that does not use the syntactic form of a 4566 // function declarator to have a function type, the program 4567 // is ill-formed. 4568 if (!T->isFunctionType()) { 4569 Diag(Loc, diag::err_unexpected_friend); 4570 4571 // It might be worthwhile to try to recover by creating an 4572 // appropriate declaration. 4573 return DeclPtrTy(); 4574 } 4575 4576 // C++ [namespace.memdef]p3 4577 // - If a friend declaration in a non-local class first declares a 4578 // class or function, the friend class or function is a member 4579 // of the innermost enclosing namespace. 4580 // - The name of the friend is not found by simple name lookup 4581 // until a matching declaration is provided in that namespace 4582 // scope (either before or after the class declaration granting 4583 // friendship). 4584 // - If a friend function is called, its name may be found by the 4585 // name lookup that considers functions from namespaces and 4586 // classes associated with the types of the function arguments. 4587 // - When looking for a prior declaration of a class or a function 4588 // declared as a friend, scopes outside the innermost enclosing 4589 // namespace scope are not considered. 4590 4591 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 4592 DeclarationName Name = GetNameForDeclarator(D); 4593 assert(Name); 4594 4595 // The context we found the declaration in, or in which we should 4596 // create the declaration. 4597 DeclContext *DC; 4598 4599 // FIXME: handle local classes 4600 4601 // Recover from invalid scope qualifiers as if they just weren't there. 4602 NamedDecl *PrevDecl = 0; 4603 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 4604 // FIXME: RequireCompleteDeclContext 4605 DC = computeDeclContext(ScopeQual); 4606 4607 // FIXME: handle dependent contexts 4608 if (!DC) return DeclPtrTy(); 4609 4610 LookupResult R; 4611 LookupQualifiedName(R, DC, Name, LookupOrdinaryName, true); 4612 PrevDecl = R.getAsSingleDecl(Context); 4613 4614 // If searching in that context implicitly found a declaration in 4615 // a different context, treat it like it wasn't found at all. 4616 // TODO: better diagnostics for this case. Suggesting the right 4617 // qualified scope would be nice... 4618 if (!PrevDecl || !PrevDecl->getDeclContext()->Equals(DC)) { 4619 D.setInvalidType(); 4620 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 4621 return DeclPtrTy(); 4622 } 4623 4624 // C++ [class.friend]p1: A friend of a class is a function or 4625 // class that is not a member of the class . . . 4626 if (DC->Equals(CurContext)) 4627 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4628 4629 // Otherwise walk out to the nearest namespace scope looking for matches. 4630 } else { 4631 // TODO: handle local class contexts. 4632 4633 DC = CurContext; 4634 while (true) { 4635 // Skip class contexts. If someone can cite chapter and verse 4636 // for this behavior, that would be nice --- it's what GCC and 4637 // EDG do, and it seems like a reasonable intent, but the spec 4638 // really only says that checks for unqualified existing 4639 // declarations should stop at the nearest enclosing namespace, 4640 // not that they should only consider the nearest enclosing 4641 // namespace. 4642 while (DC->isRecord()) 4643 DC = DC->getParent(); 4644 4645 LookupResult R; 4646 LookupQualifiedName(R, DC, Name, LookupOrdinaryName, true); 4647 PrevDecl = R.getAsSingleDecl(Context); 4648 4649 // TODO: decide what we think about using declarations. 4650 if (PrevDecl) 4651 break; 4652 4653 if (DC->isFileContext()) break; 4654 DC = DC->getParent(); 4655 } 4656 4657 // C++ [class.friend]p1: A friend of a class is a function or 4658 // class that is not a member of the class . . . 4659 // C++0x changes this for both friend types and functions. 4660 // Most C++ 98 compilers do seem to give an error here, so 4661 // we do, too. 4662 if (PrevDecl && DC->Equals(CurContext) && !getLangOptions().CPlusPlus0x) 4663 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4664 } 4665 4666 if (DC->isFileContext()) { 4667 // This implies that it has to be an operator or function. 4668 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 4669 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 4670 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 4671 Diag(Loc, diag::err_introducing_special_friend) << 4672 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 4673 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 4674 return DeclPtrTy(); 4675 } 4676 } 4677 4678 bool Redeclaration = false; 4679 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, DInfo, PrevDecl, 4680 move(TemplateParams), 4681 IsDefinition, 4682 Redeclaration); 4683 if (!ND) return DeclPtrTy(); 4684 4685 assert(ND->getDeclContext() == DC); 4686 assert(ND->getLexicalDeclContext() == CurContext); 4687 4688 // Add the function declaration to the appropriate lookup tables, 4689 // adjusting the redeclarations list as necessary. We don't 4690 // want to do this yet if the friending class is dependent. 4691 // 4692 // Also update the scope-based lookup if the target context's 4693 // lookup context is in lexical scope. 4694 if (!CurContext->isDependentContext()) { 4695 DC = DC->getLookupContext(); 4696 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 4697 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4698 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 4699 } 4700 4701 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 4702 D.getIdentifierLoc(), ND, 4703 DS.getFriendSpecLoc()); 4704 FrD->setAccess(AS_public); 4705 CurContext->addDecl(FrD); 4706 4707 return DeclPtrTy::make(ND); 4708} 4709 4710void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 4711 AdjustDeclIfTemplate(dcl); 4712 4713 Decl *Dcl = dcl.getAs<Decl>(); 4714 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 4715 if (!Fn) { 4716 Diag(DelLoc, diag::err_deleted_non_function); 4717 return; 4718 } 4719 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 4720 Diag(DelLoc, diag::err_deleted_decl_not_first); 4721 Diag(Prev->getLocation(), diag::note_previous_declaration); 4722 // If the declaration wasn't the first, we delete the function anyway for 4723 // recovery. 4724 } 4725 Fn->setDeleted(); 4726} 4727 4728static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 4729 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 4730 ++CI) { 4731 Stmt *SubStmt = *CI; 4732 if (!SubStmt) 4733 continue; 4734 if (isa<ReturnStmt>(SubStmt)) 4735 Self.Diag(SubStmt->getSourceRange().getBegin(), 4736 diag::err_return_in_constructor_handler); 4737 if (!isa<Expr>(SubStmt)) 4738 SearchForReturnInStmt(Self, SubStmt); 4739 } 4740} 4741 4742void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 4743 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 4744 CXXCatchStmt *Handler = TryBlock->getHandler(I); 4745 SearchForReturnInStmt(*this, Handler); 4746 } 4747} 4748 4749bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 4750 const CXXMethodDecl *Old) { 4751 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 4752 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 4753 4754 QualType CNewTy = Context.getCanonicalType(NewTy); 4755 QualType COldTy = Context.getCanonicalType(OldTy); 4756 4757 if (CNewTy == COldTy && 4758 CNewTy.getLocalCVRQualifiers() == COldTy.getLocalCVRQualifiers()) 4759 return false; 4760 4761 // Check if the return types are covariant 4762 QualType NewClassTy, OldClassTy; 4763 4764 /// Both types must be pointers or references to classes. 4765 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 4766 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 4767 NewClassTy = NewPT->getPointeeType(); 4768 OldClassTy = OldPT->getPointeeType(); 4769 } 4770 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 4771 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 4772 NewClassTy = NewRT->getPointeeType(); 4773 OldClassTy = OldRT->getPointeeType(); 4774 } 4775 } 4776 4777 // The return types aren't either both pointers or references to a class type. 4778 if (NewClassTy.isNull()) { 4779 Diag(New->getLocation(), 4780 diag::err_different_return_type_for_overriding_virtual_function) 4781 << New->getDeclName() << NewTy << OldTy; 4782 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4783 4784 return true; 4785 } 4786 4787 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 4788 // Check if the new class derives from the old class. 4789 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 4790 Diag(New->getLocation(), 4791 diag::err_covariant_return_not_derived) 4792 << New->getDeclName() << NewTy << OldTy; 4793 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4794 return true; 4795 } 4796 4797 // Check if we the conversion from derived to base is valid. 4798 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 4799 diag::err_covariant_return_inaccessible_base, 4800 diag::err_covariant_return_ambiguous_derived_to_base_conv, 4801 // FIXME: Should this point to the return type? 4802 New->getLocation(), SourceRange(), New->getDeclName())) { 4803 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4804 return true; 4805 } 4806 } 4807 4808 // The qualifiers of the return types must be the same. 4809 if (CNewTy.getLocalCVRQualifiers() != COldTy.getLocalCVRQualifiers()) { 4810 Diag(New->getLocation(), 4811 diag::err_covariant_return_type_different_qualifications) 4812 << New->getDeclName() << NewTy << OldTy; 4813 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4814 return true; 4815 }; 4816 4817 4818 // The new class type must have the same or less qualifiers as the old type. 4819 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 4820 Diag(New->getLocation(), 4821 diag::err_covariant_return_type_class_type_more_qualified) 4822 << New->getDeclName() << NewTy << OldTy; 4823 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4824 return true; 4825 }; 4826 4827 return false; 4828} 4829 4830/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 4831/// initializer for the declaration 'Dcl'. 4832/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 4833/// static data member of class X, names should be looked up in the scope of 4834/// class X. 4835void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4836 AdjustDeclIfTemplate(Dcl); 4837 4838 Decl *D = Dcl.getAs<Decl>(); 4839 // If there is no declaration, there was an error parsing it. 4840 if (D == 0) 4841 return; 4842 4843 // Check whether it is a declaration with a nested name specifier like 4844 // int foo::bar; 4845 if (!D->isOutOfLine()) 4846 return; 4847 4848 // C++ [basic.lookup.unqual]p13 4849 // 4850 // A name used in the definition of a static data member of class X 4851 // (after the qualified-id of the static member) is looked up as if the name 4852 // was used in a member function of X. 4853 4854 // Change current context into the context of the initializing declaration. 4855 EnterDeclaratorContext(S, D->getDeclContext()); 4856} 4857 4858/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 4859/// initializer for the declaration 'Dcl'. 4860void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4861 AdjustDeclIfTemplate(Dcl); 4862 4863 Decl *D = Dcl.getAs<Decl>(); 4864 // If there is no declaration, there was an error parsing it. 4865 if (D == 0) 4866 return; 4867 4868 // Check whether it is a declaration with a nested name specifier like 4869 // int foo::bar; 4870 if (!D->isOutOfLine()) 4871 return; 4872 4873 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 4874 ExitDeclaratorContext(S); 4875} 4876