SemaDeclCXX.cpp revision 6a587cbd6913117b0eec47bd5e60831607577270
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "Lookup.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/CXXInheritance.h" 19#include "clang/AST/DeclVisitor.h" 20#include "clang/AST/TypeOrdering.h" 21#include "clang/AST/StmtVisitor.h" 22#include "clang/Parse/DeclSpec.h" 23#include "clang/Parse/Template.h" 24#include "clang/Basic/PartialDiagnostic.h" 25#include "clang/Lex/Preprocessor.h" 26#include "llvm/ADT/STLExtras.h" 27#include "llvm/Support/Compiler.h" 28#include <algorithm> // for std::equal 29#include <map> 30#include <set> 31 32using namespace clang; 33 34//===----------------------------------------------------------------------===// 35// CheckDefaultArgumentVisitor 36//===----------------------------------------------------------------------===// 37 38namespace { 39 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 40 /// the default argument of a parameter to determine whether it 41 /// contains any ill-formed subexpressions. For example, this will 42 /// diagnose the use of local variables or parameters within the 43 /// default argument expression. 44 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 45 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 46 Expr *DefaultArg; 47 Sema *S; 48 49 public: 50 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 51 : DefaultArg(defarg), S(s) {} 52 53 bool VisitExpr(Expr *Node); 54 bool VisitDeclRefExpr(DeclRefExpr *DRE); 55 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 56 }; 57 58 /// VisitExpr - Visit all of the children of this expression. 59 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 60 bool IsInvalid = false; 61 for (Stmt::child_iterator I = Node->child_begin(), 62 E = Node->child_end(); I != E; ++I) 63 IsInvalid |= Visit(*I); 64 return IsInvalid; 65 } 66 67 /// VisitDeclRefExpr - Visit a reference to a declaration, to 68 /// determine whether this declaration can be used in the default 69 /// argument expression. 70 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 71 NamedDecl *Decl = DRE->getDecl(); 72 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 73 // C++ [dcl.fct.default]p9 74 // Default arguments are evaluated each time the function is 75 // called. The order of evaluation of function arguments is 76 // unspecified. Consequently, parameters of a function shall not 77 // be used in default argument expressions, even if they are not 78 // evaluated. Parameters of a function declared before a default 79 // argument expression are in scope and can hide namespace and 80 // class member names. 81 return S->Diag(DRE->getSourceRange().getBegin(), 82 diag::err_param_default_argument_references_param) 83 << Param->getDeclName() << DefaultArg->getSourceRange(); 84 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 85 // C++ [dcl.fct.default]p7 86 // Local variables shall not be used in default argument 87 // expressions. 88 if (VDecl->isBlockVarDecl()) 89 return S->Diag(DRE->getSourceRange().getBegin(), 90 diag::err_param_default_argument_references_local) 91 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 92 } 93 94 return false; 95 } 96 97 /// VisitCXXThisExpr - Visit a C++ "this" expression. 98 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 99 // C++ [dcl.fct.default]p8: 100 // The keyword this shall not be used in a default argument of a 101 // member function. 102 return S->Diag(ThisE->getSourceRange().getBegin(), 103 diag::err_param_default_argument_references_this) 104 << ThisE->getSourceRange(); 105 } 106} 107 108bool 109Sema::SetParamDefaultArgument(ParmVarDecl *Param, ExprArg DefaultArg, 110 SourceLocation EqualLoc) { 111 QualType ParamType = Param->getType(); 112 113 if (RequireCompleteType(Param->getLocation(), Param->getType(), 114 diag::err_typecheck_decl_incomplete_type)) { 115 Param->setInvalidDecl(); 116 return true; 117 } 118 119 Expr *Arg = (Expr *)DefaultArg.get(); 120 121 // C++ [dcl.fct.default]p5 122 // A default argument expression is implicitly converted (clause 123 // 4) to the parameter type. The default argument expression has 124 // the same semantic constraints as the initializer expression in 125 // a declaration of a variable of the parameter type, using the 126 // copy-initialization semantics (8.5). 127 if (CheckInitializerTypes(Arg, ParamType, EqualLoc, 128 Param->getDeclName(), /*DirectInit=*/false)) 129 return true; 130 131 Arg = MaybeCreateCXXExprWithTemporaries(Arg, /*DestroyTemps=*/false); 132 133 // Okay: add the default argument to the parameter 134 Param->setDefaultArg(Arg); 135 136 DefaultArg.release(); 137 138 return false; 139} 140 141/// ActOnParamDefaultArgument - Check whether the default argument 142/// provided for a function parameter is well-formed. If so, attach it 143/// to the parameter declaration. 144void 145Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 146 ExprArg defarg) { 147 if (!param || !defarg.get()) 148 return; 149 150 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 151 UnparsedDefaultArgLocs.erase(Param); 152 153 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 154 QualType ParamType = Param->getType(); 155 156 // Default arguments are only permitted in C++ 157 if (!getLangOptions().CPlusPlus) { 158 Diag(EqualLoc, diag::err_param_default_argument) 159 << DefaultArg->getSourceRange(); 160 Param->setInvalidDecl(); 161 return; 162 } 163 164 // Check that the default argument is well-formed 165 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 166 if (DefaultArgChecker.Visit(DefaultArg.get())) { 167 Param->setInvalidDecl(); 168 return; 169 } 170 171 SetParamDefaultArgument(Param, move(DefaultArg), EqualLoc); 172} 173 174/// ActOnParamUnparsedDefaultArgument - We've seen a default 175/// argument for a function parameter, but we can't parse it yet 176/// because we're inside a class definition. Note that this default 177/// argument will be parsed later. 178void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 179 SourceLocation EqualLoc, 180 SourceLocation ArgLoc) { 181 if (!param) 182 return; 183 184 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 185 if (Param) 186 Param->setUnparsedDefaultArg(); 187 188 UnparsedDefaultArgLocs[Param] = ArgLoc; 189} 190 191/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 192/// the default argument for the parameter param failed. 193void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 194 if (!param) 195 return; 196 197 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 198 199 Param->setInvalidDecl(); 200 201 UnparsedDefaultArgLocs.erase(Param); 202} 203 204/// CheckExtraCXXDefaultArguments - Check for any extra default 205/// arguments in the declarator, which is not a function declaration 206/// or definition and therefore is not permitted to have default 207/// arguments. This routine should be invoked for every declarator 208/// that is not a function declaration or definition. 209void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 210 // C++ [dcl.fct.default]p3 211 // A default argument expression shall be specified only in the 212 // parameter-declaration-clause of a function declaration or in a 213 // template-parameter (14.1). It shall not be specified for a 214 // parameter pack. If it is specified in a 215 // parameter-declaration-clause, it shall not occur within a 216 // declarator or abstract-declarator of a parameter-declaration. 217 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 218 DeclaratorChunk &chunk = D.getTypeObject(i); 219 if (chunk.Kind == DeclaratorChunk::Function) { 220 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 221 ParmVarDecl *Param = 222 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 223 if (Param->hasUnparsedDefaultArg()) { 224 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 225 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 226 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 227 delete Toks; 228 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 229 } else if (Param->getDefaultArg()) { 230 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 231 << Param->getDefaultArg()->getSourceRange(); 232 Param->setDefaultArg(0); 233 } 234 } 235 } 236 } 237} 238 239// MergeCXXFunctionDecl - Merge two declarations of the same C++ 240// function, once we already know that they have the same 241// type. Subroutine of MergeFunctionDecl. Returns true if there was an 242// error, false otherwise. 243bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 244 bool Invalid = false; 245 246 // C++ [dcl.fct.default]p4: 247 // For non-template functions, default arguments can be added in 248 // later declarations of a function in the same 249 // scope. Declarations in different scopes have completely 250 // distinct sets of default arguments. That is, declarations in 251 // inner scopes do not acquire default arguments from 252 // declarations in outer scopes, and vice versa. In a given 253 // function declaration, all parameters subsequent to a 254 // parameter with a default argument shall have default 255 // arguments supplied in this or previous declarations. A 256 // default argument shall not be redefined by a later 257 // declaration (not even to the same value). 258 // 259 // C++ [dcl.fct.default]p6: 260 // Except for member functions of class templates, the default arguments 261 // in a member function definition that appears outside of the class 262 // definition are added to the set of default arguments provided by the 263 // member function declaration in the class definition. 264 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 265 ParmVarDecl *OldParam = Old->getParamDecl(p); 266 ParmVarDecl *NewParam = New->getParamDecl(p); 267 268 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 269 // FIXME: If the parameter doesn't have an identifier then the location 270 // points to the '=' which means that the fixit hint won't remove any 271 // extra spaces between the type and the '='. 272 SourceLocation Begin = NewParam->getLocation(); 273 if (NewParam->getIdentifier()) 274 Begin = PP.getLocForEndOfToken(Begin); 275 276 Diag(NewParam->getLocation(), 277 diag::err_param_default_argument_redefinition) 278 << NewParam->getDefaultArgRange() 279 << CodeModificationHint::CreateRemoval(SourceRange(Begin, 280 NewParam->getLocEnd())); 281 282 // Look for the function declaration where the default argument was 283 // actually written, which may be a declaration prior to Old. 284 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 285 Older; Older = Older->getPreviousDeclaration()) { 286 if (!Older->getParamDecl(p)->hasDefaultArg()) 287 break; 288 289 OldParam = Older->getParamDecl(p); 290 } 291 292 Diag(OldParam->getLocation(), diag::note_previous_definition) 293 << OldParam->getDefaultArgRange(); 294 Invalid = true; 295 } else if (OldParam->hasDefaultArg()) { 296 // Merge the old default argument into the new parameter 297 if (OldParam->hasUninstantiatedDefaultArg()) 298 NewParam->setUninstantiatedDefaultArg( 299 OldParam->getUninstantiatedDefaultArg()); 300 else 301 NewParam->setDefaultArg(OldParam->getDefaultArg()); 302 } else if (NewParam->hasDefaultArg()) { 303 if (New->getDescribedFunctionTemplate()) { 304 // Paragraph 4, quoted above, only applies to non-template functions. 305 Diag(NewParam->getLocation(), 306 diag::err_param_default_argument_template_redecl) 307 << NewParam->getDefaultArgRange(); 308 Diag(Old->getLocation(), diag::note_template_prev_declaration) 309 << false; 310 } else if (New->getTemplateSpecializationKind() 311 != TSK_ImplicitInstantiation && 312 New->getTemplateSpecializationKind() != TSK_Undeclared) { 313 // C++ [temp.expr.spec]p21: 314 // Default function arguments shall not be specified in a declaration 315 // or a definition for one of the following explicit specializations: 316 // - the explicit specialization of a function template; 317 // - the explicit specialization of a member function template; 318 // - the explicit specialization of a member function of a class 319 // template where the class template specialization to which the 320 // member function specialization belongs is implicitly 321 // instantiated. 322 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 323 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 324 << New->getDeclName() 325 << NewParam->getDefaultArgRange(); 326 } else if (New->getDeclContext()->isDependentContext()) { 327 // C++ [dcl.fct.default]p6 (DR217): 328 // Default arguments for a member function of a class template shall 329 // be specified on the initial declaration of the member function 330 // within the class template. 331 // 332 // Reading the tea leaves a bit in DR217 and its reference to DR205 333 // leads me to the conclusion that one cannot add default function 334 // arguments for an out-of-line definition of a member function of a 335 // dependent type. 336 int WhichKind = 2; 337 if (CXXRecordDecl *Record 338 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 339 if (Record->getDescribedClassTemplate()) 340 WhichKind = 0; 341 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 342 WhichKind = 1; 343 else 344 WhichKind = 2; 345 } 346 347 Diag(NewParam->getLocation(), 348 diag::err_param_default_argument_member_template_redecl) 349 << WhichKind 350 << NewParam->getDefaultArgRange(); 351 } 352 } 353 } 354 355 if (CheckEquivalentExceptionSpec( 356 Old->getType()->getAs<FunctionProtoType>(), Old->getLocation(), 357 New->getType()->getAs<FunctionProtoType>(), New->getLocation())) 358 Invalid = true; 359 360 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 // C++0x CWG Issue #817 indicates that [[final]] classes shouldn't be bases. 492 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 493 Diag(BaseLoc, diag::err_final_base) << BaseType.getAsString(); 494 Diag(CXXBaseDecl->getLocation(), diag::note_previous_class_decl) 495 << BaseType.getAsString(); 496 return 0; 497 } 498 499 // C++ [dcl.init.aggr]p1: 500 // An aggregate is [...] a class with [...] no base classes [...]. 501 Class->setAggregate(false); 502 Class->setPOD(false); 503 504 if (Virtual) { 505 // C++ [class.ctor]p5: 506 // A constructor is trivial if its class has no virtual base classes. 507 Class->setHasTrivialConstructor(false); 508 509 // C++ [class.copy]p6: 510 // A copy constructor is trivial if its class has no virtual base classes. 511 Class->setHasTrivialCopyConstructor(false); 512 513 // C++ [class.copy]p11: 514 // A copy assignment operator is trivial if its class has no virtual 515 // base classes. 516 Class->setHasTrivialCopyAssignment(false); 517 518 // C++0x [meta.unary.prop] is_empty: 519 // T is a class type, but not a union type, with ... no virtual base 520 // classes 521 Class->setEmpty(false); 522 } else { 523 // C++ [class.ctor]p5: 524 // A constructor is trivial if all the direct base classes of its 525 // class have trivial constructors. 526 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialConstructor()) 527 Class->setHasTrivialConstructor(false); 528 529 // C++ [class.copy]p6: 530 // A copy constructor is trivial if all the direct base classes of its 531 // class have trivial copy constructors. 532 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyConstructor()) 533 Class->setHasTrivialCopyConstructor(false); 534 535 // C++ [class.copy]p11: 536 // A copy assignment operator is trivial if all the direct base classes 537 // of its class have trivial copy assignment operators. 538 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyAssignment()) 539 Class->setHasTrivialCopyAssignment(false); 540 } 541 542 // C++ [class.ctor]p3: 543 // A destructor is trivial if all the direct base classes of its class 544 // have trivial destructors. 545 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialDestructor()) 546 Class->setHasTrivialDestructor(false); 547 548 // Create the base specifier. 549 // FIXME: Allocate via ASTContext? 550 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 551 Class->getTagKind() == RecordDecl::TK_class, 552 Access, BaseType); 553} 554 555/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 556/// one entry in the base class list of a class specifier, for 557/// example: 558/// class foo : public bar, virtual private baz { 559/// 'public bar' and 'virtual private baz' are each base-specifiers. 560Sema::BaseResult 561Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 562 bool Virtual, AccessSpecifier Access, 563 TypeTy *basetype, SourceLocation BaseLoc) { 564 if (!classdecl) 565 return true; 566 567 AdjustDeclIfTemplate(classdecl); 568 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 569 QualType BaseType = GetTypeFromParser(basetype); 570 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 571 Virtual, Access, 572 BaseType, BaseLoc)) 573 return BaseSpec; 574 575 return true; 576} 577 578/// \brief Performs the actual work of attaching the given base class 579/// specifiers to a C++ class. 580bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 581 unsigned NumBases) { 582 if (NumBases == 0) 583 return false; 584 585 // Used to keep track of which base types we have already seen, so 586 // that we can properly diagnose redundant direct base types. Note 587 // that the key is always the unqualified canonical type of the base 588 // class. 589 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 590 591 // Copy non-redundant base specifiers into permanent storage. 592 unsigned NumGoodBases = 0; 593 bool Invalid = false; 594 for (unsigned idx = 0; idx < NumBases; ++idx) { 595 QualType NewBaseType 596 = Context.getCanonicalType(Bases[idx]->getType()); 597 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 598 599 if (KnownBaseTypes[NewBaseType]) { 600 // C++ [class.mi]p3: 601 // A class shall not be specified as a direct base class of a 602 // derived class more than once. 603 Diag(Bases[idx]->getSourceRange().getBegin(), 604 diag::err_duplicate_base_class) 605 << KnownBaseTypes[NewBaseType]->getType() 606 << Bases[idx]->getSourceRange(); 607 608 // Delete the duplicate base class specifier; we're going to 609 // overwrite its pointer later. 610 Context.Deallocate(Bases[idx]); 611 612 Invalid = true; 613 } else { 614 // Okay, add this new base class. 615 KnownBaseTypes[NewBaseType] = Bases[idx]; 616 Bases[NumGoodBases++] = Bases[idx]; 617 } 618 } 619 620 // Attach the remaining base class specifiers to the derived class. 621 Class->setBases(Context, Bases, NumGoodBases); 622 623 // Delete the remaining (good) base class specifiers, since their 624 // data has been copied into the CXXRecordDecl. 625 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 626 Context.Deallocate(Bases[idx]); 627 628 return Invalid; 629} 630 631/// ActOnBaseSpecifiers - Attach the given base specifiers to the 632/// class, after checking whether there are any duplicate base 633/// classes. 634void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 635 unsigned NumBases) { 636 if (!ClassDecl || !Bases || !NumBases) 637 return; 638 639 AdjustDeclIfTemplate(ClassDecl); 640 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 641 (CXXBaseSpecifier**)(Bases), NumBases); 642} 643 644/// \brief Determine whether the type \p Derived is a C++ class that is 645/// derived from the type \p Base. 646bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 647 if (!getLangOptions().CPlusPlus) 648 return false; 649 650 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 651 if (!DerivedRT) 652 return false; 653 654 const RecordType *BaseRT = Base->getAs<RecordType>(); 655 if (!BaseRT) 656 return false; 657 658 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 659 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 660 return DerivedRD->isDerivedFrom(BaseRD); 661} 662 663/// \brief Determine whether the type \p Derived is a C++ class that is 664/// derived from the type \p Base. 665bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 666 if (!getLangOptions().CPlusPlus) 667 return false; 668 669 const RecordType *DerivedRT = Derived->getAs<RecordType>(); 670 if (!DerivedRT) 671 return false; 672 673 const RecordType *BaseRT = Base->getAs<RecordType>(); 674 if (!BaseRT) 675 return false; 676 677 CXXRecordDecl *DerivedRD = cast<CXXRecordDecl>(DerivedRT->getDecl()); 678 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl()); 679 return DerivedRD->isDerivedFrom(BaseRD, Paths); 680} 681 682/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 683/// conversion (where Derived and Base are class types) is 684/// well-formed, meaning that the conversion is unambiguous (and 685/// that all of the base classes are accessible). Returns true 686/// and emits a diagnostic if the code is ill-formed, returns false 687/// otherwise. Loc is the location where this routine should point to 688/// if there is an error, and Range is the source range to highlight 689/// if there is an error. 690bool 691Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 692 unsigned InaccessibleBaseID, 693 unsigned AmbigiousBaseConvID, 694 SourceLocation Loc, SourceRange Range, 695 DeclarationName Name) { 696 // First, determine whether the path from Derived to Base is 697 // ambiguous. This is slightly more expensive than checking whether 698 // the Derived to Base conversion exists, because here we need to 699 // explore multiple paths to determine if there is an ambiguity. 700 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 701 /*DetectVirtual=*/false); 702 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 703 assert(DerivationOkay && 704 "Can only be used with a derived-to-base conversion"); 705 (void)DerivationOkay; 706 707 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 708 if (InaccessibleBaseID == 0) 709 return false; 710 // Check that the base class can be accessed. 711 return CheckBaseClassAccess(Derived, Base, InaccessibleBaseID, Paths, Loc, 712 Name); 713 } 714 715 // We know that the derived-to-base conversion is ambiguous, and 716 // we're going to produce a diagnostic. Perform the derived-to-base 717 // search just one more time to compute all of the possible paths so 718 // that we can print them out. This is more expensive than any of 719 // the previous derived-to-base checks we've done, but at this point 720 // performance isn't as much of an issue. 721 Paths.clear(); 722 Paths.setRecordingPaths(true); 723 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 724 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 725 (void)StillOkay; 726 727 // Build up a textual representation of the ambiguous paths, e.g., 728 // D -> B -> A, that will be used to illustrate the ambiguous 729 // conversions in the diagnostic. We only print one of the paths 730 // to each base class subobject. 731 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 732 733 Diag(Loc, AmbigiousBaseConvID) 734 << Derived << Base << PathDisplayStr << Range << Name; 735 return true; 736} 737 738bool 739Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 740 SourceLocation Loc, SourceRange Range, 741 bool IgnoreAccess) { 742 return CheckDerivedToBaseConversion(Derived, Base, 743 IgnoreAccess ? 0 : 744 diag::err_conv_to_inaccessible_base, 745 diag::err_ambiguous_derived_to_base_conv, 746 Loc, Range, DeclarationName()); 747} 748 749 750/// @brief Builds a string representing ambiguous paths from a 751/// specific derived class to different subobjects of the same base 752/// class. 753/// 754/// This function builds a string that can be used in error messages 755/// to show the different paths that one can take through the 756/// inheritance hierarchy to go from the derived class to different 757/// subobjects of a base class. The result looks something like this: 758/// @code 759/// struct D -> struct B -> struct A 760/// struct D -> struct C -> struct A 761/// @endcode 762std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 763 std::string PathDisplayStr; 764 std::set<unsigned> DisplayedPaths; 765 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 766 Path != Paths.end(); ++Path) { 767 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 768 // We haven't displayed a path to this particular base 769 // class subobject yet. 770 PathDisplayStr += "\n "; 771 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 772 for (CXXBasePath::const_iterator Element = Path->begin(); 773 Element != Path->end(); ++Element) 774 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 775 } 776 } 777 778 return PathDisplayStr; 779} 780 781//===----------------------------------------------------------------------===// 782// C++ class member Handling 783//===----------------------------------------------------------------------===// 784 785/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 786/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 787/// bitfield width if there is one and 'InitExpr' specifies the initializer if 788/// any. 789Sema::DeclPtrTy 790Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 791 MultiTemplateParamsArg TemplateParameterLists, 792 ExprTy *BW, ExprTy *InitExpr, bool IsDefinition, 793 bool Deleted) { 794 const DeclSpec &DS = D.getDeclSpec(); 795 DeclarationName Name = GetNameForDeclarator(D); 796 Expr *BitWidth = static_cast<Expr*>(BW); 797 Expr *Init = static_cast<Expr*>(InitExpr); 798 SourceLocation Loc = D.getIdentifierLoc(); 799 800 bool isFunc = D.isFunctionDeclarator(); 801 802 assert(!DS.isFriendSpecified()); 803 804 // C++ 9.2p6: A member shall not be declared to have automatic storage 805 // duration (auto, register) or with the extern storage-class-specifier. 806 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 807 // data members and cannot be applied to names declared const or static, 808 // and cannot be applied to reference members. 809 switch (DS.getStorageClassSpec()) { 810 case DeclSpec::SCS_unspecified: 811 case DeclSpec::SCS_typedef: 812 case DeclSpec::SCS_static: 813 // FALL THROUGH. 814 break; 815 case DeclSpec::SCS_mutable: 816 if (isFunc) { 817 if (DS.getStorageClassSpecLoc().isValid()) 818 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 819 else 820 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 821 822 // FIXME: It would be nicer if the keyword was ignored only for this 823 // declarator. Otherwise we could get follow-up errors. 824 D.getMutableDeclSpec().ClearStorageClassSpecs(); 825 } else { 826 QualType T = GetTypeForDeclarator(D, S); 827 diag::kind err = static_cast<diag::kind>(0); 828 if (T->isReferenceType()) 829 err = diag::err_mutable_reference; 830 else if (T.isConstQualified()) 831 err = diag::err_mutable_const; 832 if (err != 0) { 833 if (DS.getStorageClassSpecLoc().isValid()) 834 Diag(DS.getStorageClassSpecLoc(), err); 835 else 836 Diag(DS.getThreadSpecLoc(), err); 837 // FIXME: It would be nicer if the keyword was ignored only for this 838 // declarator. Otherwise we could get follow-up errors. 839 D.getMutableDeclSpec().ClearStorageClassSpecs(); 840 } 841 } 842 break; 843 default: 844 if (DS.getStorageClassSpecLoc().isValid()) 845 Diag(DS.getStorageClassSpecLoc(), 846 diag::err_storageclass_invalid_for_member); 847 else 848 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 849 D.getMutableDeclSpec().ClearStorageClassSpecs(); 850 } 851 852 if (!isFunc && 853 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 854 D.getNumTypeObjects() == 0) { 855 // Check also for this case: 856 // 857 // typedef int f(); 858 // f a; 859 // 860 QualType TDType = GetTypeFromParser(DS.getTypeRep()); 861 isFunc = TDType->isFunctionType(); 862 } 863 864 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 865 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 866 !isFunc); 867 868 Decl *Member; 869 if (isInstField) { 870 // FIXME: Check for template parameters! 871 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 872 AS); 873 assert(Member && "HandleField never returns null"); 874 } else { 875 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition) 876 .getAs<Decl>(); 877 if (!Member) { 878 if (BitWidth) DeleteExpr(BitWidth); 879 return DeclPtrTy(); 880 } 881 882 // Non-instance-fields can't have a bitfield. 883 if (BitWidth) { 884 if (Member->isInvalidDecl()) { 885 // don't emit another diagnostic. 886 } else if (isa<VarDecl>(Member)) { 887 // C++ 9.6p3: A bit-field shall not be a static member. 888 // "static member 'A' cannot be a bit-field" 889 Diag(Loc, diag::err_static_not_bitfield) 890 << Name << BitWidth->getSourceRange(); 891 } else if (isa<TypedefDecl>(Member)) { 892 // "typedef member 'x' cannot be a bit-field" 893 Diag(Loc, diag::err_typedef_not_bitfield) 894 << Name << BitWidth->getSourceRange(); 895 } else { 896 // A function typedef ("typedef int f(); f a;"). 897 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 898 Diag(Loc, diag::err_not_integral_type_bitfield) 899 << Name << cast<ValueDecl>(Member)->getType() 900 << BitWidth->getSourceRange(); 901 } 902 903 DeleteExpr(BitWidth); 904 BitWidth = 0; 905 Member->setInvalidDecl(); 906 } 907 908 Member->setAccess(AS); 909 910 // If we have declared a member function template, set the access of the 911 // templated declaration as well. 912 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 913 FunTmpl->getTemplatedDecl()->setAccess(AS); 914 } 915 916 assert((Name || isInstField) && "No identifier for non-field ?"); 917 918 if (Init) 919 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 920 if (Deleted) // FIXME: Source location is not very good. 921 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 922 923 if (isInstField) { 924 FieldCollector->Add(cast<FieldDecl>(Member)); 925 return DeclPtrTy(); 926 } 927 return DeclPtrTy::make(Member); 928} 929 930/// ActOnMemInitializer - Handle a C++ member initializer. 931Sema::MemInitResult 932Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 933 Scope *S, 934 const CXXScopeSpec &SS, 935 IdentifierInfo *MemberOrBase, 936 TypeTy *TemplateTypeTy, 937 SourceLocation IdLoc, 938 SourceLocation LParenLoc, 939 ExprTy **Args, unsigned NumArgs, 940 SourceLocation *CommaLocs, 941 SourceLocation RParenLoc) { 942 if (!ConstructorD) 943 return true; 944 945 AdjustDeclIfTemplate(ConstructorD); 946 947 CXXConstructorDecl *Constructor 948 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 949 if (!Constructor) { 950 // The user wrote a constructor initializer on a function that is 951 // not a C++ constructor. Ignore the error for now, because we may 952 // have more member initializers coming; we'll diagnose it just 953 // once in ActOnMemInitializers. 954 return true; 955 } 956 957 CXXRecordDecl *ClassDecl = Constructor->getParent(); 958 959 // C++ [class.base.init]p2: 960 // Names in a mem-initializer-id are looked up in the scope of the 961 // constructor’s class and, if not found in that scope, are looked 962 // up in the scope containing the constructor’s 963 // definition. [Note: if the constructor’s class contains a member 964 // with the same name as a direct or virtual base class of the 965 // class, a mem-initializer-id naming the member or base class and 966 // composed of a single identifier refers to the class member. A 967 // mem-initializer-id for the hidden base class may be specified 968 // using a qualified name. ] 969 if (!SS.getScopeRep() && !TemplateTypeTy) { 970 // Look for a member, first. 971 FieldDecl *Member = 0; 972 DeclContext::lookup_result Result 973 = ClassDecl->lookup(MemberOrBase); 974 if (Result.first != Result.second) 975 Member = dyn_cast<FieldDecl>(*Result.first); 976 977 // FIXME: Handle members of an anonymous union. 978 979 if (Member) 980 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 981 RParenLoc); 982 } 983 // It didn't name a member, so see if it names a class. 984 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 985 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 986 if (!BaseTy) 987 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 988 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 989 990 QualType BaseType = GetTypeFromParser(BaseTy); 991 992 return BuildBaseInitializer(BaseType, (Expr **)Args, NumArgs, IdLoc, 993 RParenLoc, ClassDecl); 994} 995 996/// Checks an initializer expression for use of uninitialized fields, such as 997/// containing the field that is being initialized. Returns true if there is an 998/// uninitialized field was used an updates the SourceLocation parameter; false 999/// otherwise. 1000static bool InitExprContainsUninitializedFields(const Stmt* S, 1001 const FieldDecl* LhsField, 1002 SourceLocation* L) { 1003 const MemberExpr* ME = dyn_cast<MemberExpr>(S); 1004 if (ME) { 1005 const NamedDecl* RhsField = ME->getMemberDecl(); 1006 if (RhsField == LhsField) { 1007 // Initializing a field with itself. Throw a warning. 1008 // But wait; there are exceptions! 1009 // Exception #1: The field may not belong to this record. 1010 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1011 const Expr* base = ME->getBase(); 1012 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1013 // Even though the field matches, it does not belong to this record. 1014 return false; 1015 } 1016 // None of the exceptions triggered; return true to indicate an 1017 // uninitialized field was used. 1018 *L = ME->getMemberLoc(); 1019 return true; 1020 } 1021 } 1022 bool found = false; 1023 for (Stmt::const_child_iterator it = S->child_begin(); 1024 it != S->child_end() && found == false; 1025 ++it) { 1026 if (isa<CallExpr>(S)) { 1027 // Do not descend into function calls or constructors, as the use 1028 // of an uninitialized field may be valid. One would have to inspect 1029 // the contents of the function/ctor to determine if it is safe or not. 1030 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1031 // may be safe, depending on what the function/ctor does. 1032 continue; 1033 } 1034 found = InitExprContainsUninitializedFields(*it, LhsField, L); 1035 } 1036 return found; 1037} 1038 1039Sema::MemInitResult 1040Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 1041 unsigned NumArgs, SourceLocation IdLoc, 1042 SourceLocation RParenLoc) { 1043 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1044 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1045 ExprTemporaries.clear(); 1046 1047 // Diagnose value-uses of fields to initialize themselves, e.g. 1048 // foo(foo) 1049 // where foo is not also a parameter to the constructor. 1050 // TODO: implement -Wuninitialized and fold this into that framework. 1051 for (unsigned i = 0; i < NumArgs; ++i) { 1052 SourceLocation L; 1053 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1054 // FIXME: Return true in the case when other fields are used before being 1055 // uninitialized. For example, let this field be the i'th field. When 1056 // initializing the i'th field, throw a warning if any of the >= i'th 1057 // fields are used, as they are not yet initialized. 1058 // Right now we are only handling the case where the i'th field uses 1059 // itself in its initializer. 1060 Diag(L, diag::warn_field_is_uninit); 1061 } 1062 } 1063 1064 bool HasDependentArg = false; 1065 for (unsigned i = 0; i < NumArgs; i++) 1066 HasDependentArg |= Args[i]->isTypeDependent(); 1067 1068 CXXConstructorDecl *C = 0; 1069 QualType FieldType = Member->getType(); 1070 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1071 FieldType = Array->getElementType(); 1072 if (FieldType->isDependentType()) { 1073 // Can't check init for dependent type. 1074 } else if (FieldType->isRecordType()) { 1075 // Member is a record (struct/union/class), so pass the initializer 1076 // arguments down to the record's constructor. 1077 if (!HasDependentArg) { 1078 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1079 1080 C = PerformInitializationByConstructor(FieldType, 1081 MultiExprArg(*this, 1082 (void**)Args, 1083 NumArgs), 1084 IdLoc, 1085 SourceRange(IdLoc, RParenLoc), 1086 Member->getDeclName(), IK_Direct, 1087 ConstructorArgs); 1088 1089 if (C) { 1090 // Take over the constructor arguments as our own. 1091 NumArgs = ConstructorArgs.size(); 1092 Args = (Expr **)ConstructorArgs.take(); 1093 } 1094 } 1095 } else if (NumArgs != 1 && NumArgs != 0) { 1096 // The member type is not a record type (or an array of record 1097 // types), so it can be only be default- or copy-initialized. 1098 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 1099 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 1100 } else if (!HasDependentArg) { 1101 Expr *NewExp; 1102 if (NumArgs == 0) { 1103 if (FieldType->isReferenceType()) { 1104 Diag(IdLoc, diag::err_null_intialized_reference_member) 1105 << Member->getDeclName(); 1106 return Diag(Member->getLocation(), diag::note_declared_at); 1107 } 1108 NewExp = new (Context) CXXZeroInitValueExpr(FieldType, IdLoc, RParenLoc); 1109 NumArgs = 1; 1110 } 1111 else 1112 NewExp = (Expr*)Args[0]; 1113 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 1114 return true; 1115 Args[0] = NewExp; 1116 } 1117 1118 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1119 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1120 ExprTemporaries.clear(); 1121 1122 // FIXME: Perform direct initialization of the member. 1123 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 1124 NumArgs, C, IdLoc, RParenLoc); 1125} 1126 1127Sema::MemInitResult 1128Sema::BuildBaseInitializer(QualType BaseType, Expr **Args, 1129 unsigned NumArgs, SourceLocation IdLoc, 1130 SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) { 1131 bool HasDependentArg = false; 1132 for (unsigned i = 0; i < NumArgs; i++) 1133 HasDependentArg |= Args[i]->isTypeDependent(); 1134 1135 if (!BaseType->isDependentType()) { 1136 if (!BaseType->isRecordType()) 1137 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 1138 << BaseType << SourceRange(IdLoc, RParenLoc); 1139 1140 // C++ [class.base.init]p2: 1141 // [...] Unless the mem-initializer-id names a nonstatic data 1142 // member of the constructor’s class or a direct or virtual base 1143 // of that class, the mem-initializer is ill-formed. A 1144 // mem-initializer-list can initialize a base class using any 1145 // name that denotes that base class type. 1146 1147 // First, check for a direct base class. 1148 const CXXBaseSpecifier *DirectBaseSpec = 0; 1149 for (CXXRecordDecl::base_class_const_iterator Base = 1150 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 1151 if (Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1152 // We found a direct base of this type. That's what we're 1153 // initializing. 1154 DirectBaseSpec = &*Base; 1155 break; 1156 } 1157 } 1158 1159 // Check for a virtual base class. 1160 // FIXME: We might be able to short-circuit this if we know in advance that 1161 // there are no virtual bases. 1162 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1163 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1164 // We haven't found a base yet; search the class hierarchy for a 1165 // virtual base class. 1166 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1167 /*DetectVirtual=*/false); 1168 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 1169 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1170 Path != Paths.end(); ++Path) { 1171 if (Path->back().Base->isVirtual()) { 1172 VirtualBaseSpec = Path->back().Base; 1173 break; 1174 } 1175 } 1176 } 1177 } 1178 1179 // C++ [base.class.init]p2: 1180 // If a mem-initializer-id is ambiguous because it designates both 1181 // a direct non-virtual base class and an inherited virtual base 1182 // class, the mem-initializer is ill-formed. 1183 if (DirectBaseSpec && VirtualBaseSpec) 1184 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 1185 << BaseType << SourceRange(IdLoc, RParenLoc); 1186 // C++ [base.class.init]p2: 1187 // Unless the mem-initializer-id names a nonstatic data membeer of the 1188 // constructor's class ot a direst or virtual base of that class, the 1189 // mem-initializer is ill-formed. 1190 if (!DirectBaseSpec && !VirtualBaseSpec) 1191 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 1192 << BaseType << ClassDecl->getNameAsCString() 1193 << SourceRange(IdLoc, RParenLoc); 1194 } 1195 1196 CXXConstructorDecl *C = 0; 1197 if (!BaseType->isDependentType() && !HasDependentArg) { 1198 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 1199 Context.getCanonicalType(BaseType).getUnqualifiedType()); 1200 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 1201 1202 C = PerformInitializationByConstructor(BaseType, 1203 MultiExprArg(*this, 1204 (void**)Args, NumArgs), 1205 IdLoc, SourceRange(IdLoc, RParenLoc), 1206 Name, IK_Direct, 1207 ConstructorArgs); 1208 if (C) { 1209 // Take over the constructor arguments as our own. 1210 NumArgs = ConstructorArgs.size(); 1211 Args = (Expr **)ConstructorArgs.take(); 1212 } 1213 } 1214 1215 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1216 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1217 ExprTemporaries.clear(); 1218 1219 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 1220 NumArgs, C, IdLoc, RParenLoc); 1221} 1222 1223bool 1224Sema::SetBaseOrMemberInitializers(CXXConstructorDecl *Constructor, 1225 CXXBaseOrMemberInitializer **Initializers, 1226 unsigned NumInitializers, 1227 bool IsImplicitConstructor) { 1228 // We need to build the initializer AST according to order of construction 1229 // and not what user specified in the Initializers list. 1230 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1231 llvm::SmallVector<CXXBaseOrMemberInitializer*, 32> AllToInit; 1232 llvm::DenseMap<const void *, CXXBaseOrMemberInitializer*> AllBaseFields; 1233 bool HasDependentBaseInit = false; 1234 bool HadError = false; 1235 1236 for (unsigned i = 0; i < NumInitializers; i++) { 1237 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1238 if (Member->isBaseInitializer()) { 1239 if (Member->getBaseClass()->isDependentType()) 1240 HasDependentBaseInit = true; 1241 AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 1242 } else { 1243 AllBaseFields[Member->getMember()] = Member; 1244 } 1245 } 1246 1247 if (HasDependentBaseInit) { 1248 // FIXME. This does not preserve the ordering of the initializers. 1249 // Try (with -Wreorder) 1250 // template<class X> struct A {}; 1251 // template<class X> struct B : A<X> { 1252 // B() : x1(10), A<X>() {} 1253 // int x1; 1254 // }; 1255 // B<int> x; 1256 // On seeing one dependent type, we should essentially exit this routine 1257 // while preserving user-declared initializer list. When this routine is 1258 // called during instantiatiation process, this routine will rebuild the 1259 // ordered initializer list correctly. 1260 1261 // If we have a dependent base initialization, we can't determine the 1262 // association between initializers and bases; just dump the known 1263 // initializers into the list, and don't try to deal with other bases. 1264 for (unsigned i = 0; i < NumInitializers; i++) { 1265 CXXBaseOrMemberInitializer *Member = Initializers[i]; 1266 if (Member->isBaseInitializer()) 1267 AllToInit.push_back(Member); 1268 } 1269 } else { 1270 // Push virtual bases before others. 1271 for (CXXRecordDecl::base_class_iterator VBase = 1272 ClassDecl->vbases_begin(), 1273 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1274 if (VBase->getType()->isDependentType()) 1275 continue; 1276 if (CXXBaseOrMemberInitializer *Value 1277 = AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 1278 AllToInit.push_back(Value); 1279 } 1280 else { 1281 CXXRecordDecl *VBaseDecl = 1282 cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1283 assert(VBaseDecl && "SetBaseOrMemberInitializers - VBaseDecl null"); 1284 CXXConstructorDecl *Ctor = VBaseDecl->getDefaultConstructor(Context); 1285 if (!Ctor) { 1286 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1287 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1288 << 0 << VBase->getType(); 1289 Diag(VBaseDecl->getLocation(), diag::note_previous_class_decl) 1290 << Context.getTagDeclType(VBaseDecl); 1291 HadError = true; 1292 continue; 1293 } 1294 1295 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1296 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1297 Constructor->getLocation(), CtorArgs)) 1298 continue; 1299 1300 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1301 1302 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1303 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1304 ExprTemporaries.clear(); 1305 CXXBaseOrMemberInitializer *Member = 1306 new (Context) CXXBaseOrMemberInitializer(VBase->getType(), 1307 CtorArgs.takeAs<Expr>(), 1308 CtorArgs.size(), Ctor, 1309 SourceLocation(), 1310 SourceLocation()); 1311 AllToInit.push_back(Member); 1312 } 1313 } 1314 1315 for (CXXRecordDecl::base_class_iterator Base = 1316 ClassDecl->bases_begin(), 1317 E = ClassDecl->bases_end(); Base != E; ++Base) { 1318 // Virtuals are in the virtual base list and already constructed. 1319 if (Base->isVirtual()) 1320 continue; 1321 // Skip dependent types. 1322 if (Base->getType()->isDependentType()) 1323 continue; 1324 if (CXXBaseOrMemberInitializer *Value 1325 = AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 1326 AllToInit.push_back(Value); 1327 } 1328 else { 1329 CXXRecordDecl *BaseDecl = 1330 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1331 assert(BaseDecl && "SetBaseOrMemberInitializers - BaseDecl null"); 1332 CXXConstructorDecl *Ctor = BaseDecl->getDefaultConstructor(Context); 1333 if (!Ctor) { 1334 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1335 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1336 << 0 << Base->getType(); 1337 Diag(BaseDecl->getLocation(), diag::note_previous_class_decl) 1338 << Context.getTagDeclType(BaseDecl); 1339 HadError = true; 1340 continue; 1341 } 1342 1343 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1344 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1345 Constructor->getLocation(), CtorArgs)) 1346 continue; 1347 1348 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1349 1350 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1351 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1352 ExprTemporaries.clear(); 1353 CXXBaseOrMemberInitializer *Member = 1354 new (Context) CXXBaseOrMemberInitializer(Base->getType(), 1355 CtorArgs.takeAs<Expr>(), 1356 CtorArgs.size(), Ctor, 1357 SourceLocation(), 1358 SourceLocation()); 1359 AllToInit.push_back(Member); 1360 } 1361 } 1362 } 1363 1364 // non-static data members. 1365 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1366 E = ClassDecl->field_end(); Field != E; ++Field) { 1367 if ((*Field)->isAnonymousStructOrUnion()) { 1368 if (const RecordType *FieldClassType = 1369 Field->getType()->getAs<RecordType>()) { 1370 CXXRecordDecl *FieldClassDecl 1371 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1372 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 1373 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 1374 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*FA)) { 1375 // 'Member' is the anonymous union field and 'AnonUnionMember' is 1376 // set to the anonymous union data member used in the initializer 1377 // list. 1378 Value->setMember(*Field); 1379 Value->setAnonUnionMember(*FA); 1380 AllToInit.push_back(Value); 1381 break; 1382 } 1383 } 1384 } 1385 continue; 1386 } 1387 if (CXXBaseOrMemberInitializer *Value = AllBaseFields.lookup(*Field)) { 1388 AllToInit.push_back(Value); 1389 continue; 1390 } 1391 1392 if ((*Field)->getType()->isDependentType()) 1393 continue; 1394 1395 QualType FT = Context.getBaseElementType((*Field)->getType()); 1396 if (const RecordType* RT = FT->getAs<RecordType>()) { 1397 CXXConstructorDecl *Ctor = 1398 cast<CXXRecordDecl>(RT->getDecl())->getDefaultConstructor(Context); 1399 if (!Ctor) { 1400 Diag(Constructor->getLocation(), diag::err_missing_default_ctor) 1401 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1402 << 1 << (*Field)->getDeclName(); 1403 Diag(Field->getLocation(), diag::note_field_decl); 1404 Diag(RT->getDecl()->getLocation(), diag::note_previous_class_decl) 1405 << Context.getTagDeclType(RT->getDecl()); 1406 HadError = true; 1407 continue; 1408 } 1409 1410 if (FT.isConstQualified() && Ctor->isTrivial()) { 1411 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1412 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1413 << 1 << (*Field)->getDeclName(); 1414 Diag((*Field)->getLocation(), diag::note_declared_at); 1415 HadError = true; 1416 } 1417 1418 // Don't create initializers for trivial constructors, since they don't 1419 // actually need to be run. 1420 if (Ctor->isTrivial()) 1421 continue; 1422 1423 ASTOwningVector<&ActionBase::DeleteExpr> CtorArgs(*this); 1424 if (CompleteConstructorCall(Ctor, MultiExprArg(*this, 0, 0), 1425 Constructor->getLocation(), CtorArgs)) 1426 continue; 1427 1428 // FIXME: CXXBaseOrMemberInitializer should only contain a single 1429 // subexpression so we can wrap it in a CXXExprWithTemporaries if necessary. 1430 ExprTemporaries.clear(); 1431 CXXBaseOrMemberInitializer *Member = 1432 new (Context) CXXBaseOrMemberInitializer(*Field,CtorArgs.takeAs<Expr>(), 1433 CtorArgs.size(), Ctor, 1434 SourceLocation(), 1435 SourceLocation()); 1436 1437 AllToInit.push_back(Member); 1438 MarkDeclarationReferenced(Constructor->getLocation(), Ctor); 1439 } 1440 else if (FT->isReferenceType()) { 1441 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1442 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1443 << 0 << (*Field)->getDeclName(); 1444 Diag((*Field)->getLocation(), diag::note_declared_at); 1445 HadError = true; 1446 } 1447 else if (FT.isConstQualified()) { 1448 Diag(Constructor->getLocation(), diag::err_unintialized_member_in_ctor) 1449 << (int)IsImplicitConstructor << Context.getTagDeclType(ClassDecl) 1450 << 1 << (*Field)->getDeclName(); 1451 Diag((*Field)->getLocation(), diag::note_declared_at); 1452 HadError = true; 1453 } 1454 } 1455 1456 NumInitializers = AllToInit.size(); 1457 if (NumInitializers > 0) { 1458 Constructor->setNumBaseOrMemberInitializers(NumInitializers); 1459 CXXBaseOrMemberInitializer **baseOrMemberInitializers = 1460 new (Context) CXXBaseOrMemberInitializer*[NumInitializers]; 1461 1462 Constructor->setBaseOrMemberInitializers(baseOrMemberInitializers); 1463 for (unsigned Idx = 0; Idx < NumInitializers; ++Idx) 1464 baseOrMemberInitializers[Idx] = AllToInit[Idx]; 1465 } 1466 1467 return HadError; 1468} 1469 1470static void *GetKeyForTopLevelField(FieldDecl *Field) { 1471 // For anonymous unions, use the class declaration as the key. 1472 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1473 if (RT->getDecl()->isAnonymousStructOrUnion()) 1474 return static_cast<void *>(RT->getDecl()); 1475 } 1476 return static_cast<void *>(Field); 1477} 1478 1479static void *GetKeyForBase(QualType BaseType) { 1480 if (const RecordType *RT = BaseType->getAs<RecordType>()) 1481 return (void *)RT; 1482 1483 assert(0 && "Unexpected base type!"); 1484 return 0; 1485} 1486 1487static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 1488 bool MemberMaybeAnon = false) { 1489 // For fields injected into the class via declaration of an anonymous union, 1490 // use its anonymous union class declaration as the unique key. 1491 if (Member->isMemberInitializer()) { 1492 FieldDecl *Field = Member->getMember(); 1493 1494 // After SetBaseOrMemberInitializers call, Field is the anonymous union 1495 // data member of the class. Data member used in the initializer list is 1496 // in AnonUnionMember field. 1497 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 1498 Field = Member->getAnonUnionMember(); 1499 if (Field->getDeclContext()->isRecord()) { 1500 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 1501 if (RD->isAnonymousStructOrUnion()) 1502 return static_cast<void *>(RD); 1503 } 1504 return static_cast<void *>(Field); 1505 } 1506 1507 return GetKeyForBase(QualType(Member->getBaseClass(), 0)); 1508} 1509 1510/// ActOnMemInitializers - Handle the member initializers for a constructor. 1511void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 1512 SourceLocation ColonLoc, 1513 MemInitTy **MemInits, unsigned NumMemInits) { 1514 if (!ConstructorDecl) 1515 return; 1516 1517 AdjustDeclIfTemplate(ConstructorDecl); 1518 1519 CXXConstructorDecl *Constructor 1520 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 1521 1522 if (!Constructor) { 1523 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 1524 return; 1525 } 1526 1527 if (!Constructor->isDependentContext()) { 1528 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 1529 bool err = false; 1530 for (unsigned i = 0; i < NumMemInits; i++) { 1531 CXXBaseOrMemberInitializer *Member = 1532 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1533 void *KeyToMember = GetKeyForMember(Member); 1534 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 1535 if (!PrevMember) { 1536 PrevMember = Member; 1537 continue; 1538 } 1539 if (FieldDecl *Field = Member->getMember()) 1540 Diag(Member->getSourceLocation(), 1541 diag::error_multiple_mem_initialization) 1542 << Field->getNameAsString(); 1543 else { 1544 Type *BaseClass = Member->getBaseClass(); 1545 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 1546 Diag(Member->getSourceLocation(), 1547 diag::error_multiple_base_initialization) 1548 << QualType(BaseClass, 0); 1549 } 1550 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 1551 << 0; 1552 err = true; 1553 } 1554 1555 if (err) 1556 return; 1557 } 1558 1559 SetBaseOrMemberInitializers(Constructor, 1560 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 1561 NumMemInits, false); 1562 1563 if (Constructor->isDependentContext()) 1564 return; 1565 1566 if (Diags.getDiagnosticLevel(diag::warn_base_initialized) == 1567 Diagnostic::Ignored && 1568 Diags.getDiagnosticLevel(diag::warn_field_initialized) == 1569 Diagnostic::Ignored) 1570 return; 1571 1572 // Also issue warning if order of ctor-initializer list does not match order 1573 // of 1) base class declarations and 2) order of non-static data members. 1574 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 1575 1576 CXXRecordDecl *ClassDecl 1577 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 1578 // Push virtual bases before others. 1579 for (CXXRecordDecl::base_class_iterator VBase = 1580 ClassDecl->vbases_begin(), 1581 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 1582 AllBaseOrMembers.push_back(GetKeyForBase(VBase->getType())); 1583 1584 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1585 E = ClassDecl->bases_end(); Base != E; ++Base) { 1586 // Virtuals are alread in the virtual base list and are constructed 1587 // first. 1588 if (Base->isVirtual()) 1589 continue; 1590 AllBaseOrMembers.push_back(GetKeyForBase(Base->getType())); 1591 } 1592 1593 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 1594 E = ClassDecl->field_end(); Field != E; ++Field) 1595 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 1596 1597 int Last = AllBaseOrMembers.size(); 1598 int curIndex = 0; 1599 CXXBaseOrMemberInitializer *PrevMember = 0; 1600 for (unsigned i = 0; i < NumMemInits; i++) { 1601 CXXBaseOrMemberInitializer *Member = 1602 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 1603 void *MemberInCtorList = GetKeyForMember(Member, true); 1604 1605 for (; curIndex < Last; curIndex++) 1606 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1607 break; 1608 if (curIndex == Last) { 1609 assert(PrevMember && "Member not in member list?!"); 1610 // Initializer as specified in ctor-initializer list is out of order. 1611 // Issue a warning diagnostic. 1612 if (PrevMember->isBaseInitializer()) { 1613 // Diagnostics is for an initialized base class. 1614 Type *BaseClass = PrevMember->getBaseClass(); 1615 Diag(PrevMember->getSourceLocation(), 1616 diag::warn_base_initialized) 1617 << QualType(BaseClass, 0); 1618 } else { 1619 FieldDecl *Field = PrevMember->getMember(); 1620 Diag(PrevMember->getSourceLocation(), 1621 diag::warn_field_initialized) 1622 << Field->getNameAsString(); 1623 } 1624 // Also the note! 1625 if (FieldDecl *Field = Member->getMember()) 1626 Diag(Member->getSourceLocation(), 1627 diag::note_fieldorbase_initialized_here) << 0 1628 << Field->getNameAsString(); 1629 else { 1630 Type *BaseClass = Member->getBaseClass(); 1631 Diag(Member->getSourceLocation(), 1632 diag::note_fieldorbase_initialized_here) << 1 1633 << QualType(BaseClass, 0); 1634 } 1635 for (curIndex = 0; curIndex < Last; curIndex++) 1636 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1637 break; 1638 } 1639 PrevMember = Member; 1640 } 1641} 1642 1643void 1644Sema::MarkBaseAndMemberDestructorsReferenced(CXXDestructorDecl *Destructor) { 1645 // Ignore dependent destructors. 1646 if (Destructor->isDependentContext()) 1647 return; 1648 1649 CXXRecordDecl *ClassDecl = Destructor->getParent(); 1650 1651 // Non-static data members. 1652 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 1653 E = ClassDecl->field_end(); I != E; ++I) { 1654 FieldDecl *Field = *I; 1655 1656 QualType FieldType = Context.getBaseElementType(Field->getType()); 1657 1658 const RecordType* RT = FieldType->getAs<RecordType>(); 1659 if (!RT) 1660 continue; 1661 1662 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 1663 if (FieldClassDecl->hasTrivialDestructor()) 1664 continue; 1665 1666 const CXXDestructorDecl *Dtor = FieldClassDecl->getDestructor(Context); 1667 MarkDeclarationReferenced(Destructor->getLocation(), 1668 const_cast<CXXDestructorDecl*>(Dtor)); 1669 } 1670 1671 // Bases. 1672 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 1673 E = ClassDecl->bases_end(); Base != E; ++Base) { 1674 // Ignore virtual bases. 1675 if (Base->isVirtual()) 1676 continue; 1677 1678 // Ignore trivial destructors. 1679 CXXRecordDecl *BaseClassDecl 1680 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1681 if (BaseClassDecl->hasTrivialDestructor()) 1682 continue; 1683 1684 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1685 MarkDeclarationReferenced(Destructor->getLocation(), 1686 const_cast<CXXDestructorDecl*>(Dtor)); 1687 } 1688 1689 // Virtual bases. 1690 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 1691 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 1692 // Ignore trivial destructors. 1693 CXXRecordDecl *BaseClassDecl 1694 = cast<CXXRecordDecl>(VBase->getType()->getAs<RecordType>()->getDecl()); 1695 if (BaseClassDecl->hasTrivialDestructor()) 1696 continue; 1697 1698 const CXXDestructorDecl *Dtor = BaseClassDecl->getDestructor(Context); 1699 MarkDeclarationReferenced(Destructor->getLocation(), 1700 const_cast<CXXDestructorDecl*>(Dtor)); 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 (void)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 if (ClassDecl->replaceConversion(ExpectedPrevDecl, Conversion)) 2605 return DeclPtrTy::make(Conversion); 2606 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 2607 } else if (FunctionTemplateDecl *ConversionTemplate 2608 = Conversion->getDescribedFunctionTemplate()) 2609 ClassDecl->addConversionFunction(ConversionTemplate); 2610 else if (!Conversion->getPrimaryTemplate()) // ignore specializations 2611 ClassDecl->addConversionFunction(Conversion); 2612 2613 return DeclPtrTy::make(Conversion); 2614} 2615 2616//===----------------------------------------------------------------------===// 2617// Namespace Handling 2618//===----------------------------------------------------------------------===// 2619 2620/// ActOnStartNamespaceDef - This is called at the start of a namespace 2621/// definition. 2622Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 2623 SourceLocation IdentLoc, 2624 IdentifierInfo *II, 2625 SourceLocation LBrace) { 2626 NamespaceDecl *Namespc = 2627 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 2628 Namespc->setLBracLoc(LBrace); 2629 2630 Scope *DeclRegionScope = NamespcScope->getParent(); 2631 2632 if (II) { 2633 // C++ [namespace.def]p2: 2634 // The identifier in an original-namespace-definition shall not have been 2635 // previously defined in the declarative region in which the 2636 // original-namespace-definition appears. The identifier in an 2637 // original-namespace-definition is the name of the namespace. Subsequently 2638 // in that declarative region, it is treated as an original-namespace-name. 2639 2640 NamedDecl *PrevDecl 2641 = LookupSingleName(DeclRegionScope, II, LookupOrdinaryName, 2642 ForRedeclaration); 2643 2644 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 2645 // This is an extended namespace definition. 2646 // Attach this namespace decl to the chain of extended namespace 2647 // definitions. 2648 OrigNS->setNextNamespace(Namespc); 2649 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 2650 2651 // Remove the previous declaration from the scope. 2652 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 2653 IdResolver.RemoveDecl(OrigNS); 2654 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 2655 } 2656 } else if (PrevDecl) { 2657 // This is an invalid name redefinition. 2658 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 2659 << Namespc->getDeclName(); 2660 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2661 Namespc->setInvalidDecl(); 2662 // Continue on to push Namespc as current DeclContext and return it. 2663 } else if (II->isStr("std") && 2664 CurContext->getLookupContext()->isTranslationUnit()) { 2665 // This is the first "real" definition of the namespace "std", so update 2666 // our cache of the "std" namespace to point at this definition. 2667 if (StdNamespace) { 2668 // We had already defined a dummy namespace "std". Link this new 2669 // namespace definition to the dummy namespace "std". 2670 StdNamespace->setNextNamespace(Namespc); 2671 StdNamespace->setLocation(IdentLoc); 2672 Namespc->setOriginalNamespace(StdNamespace->getOriginalNamespace()); 2673 } 2674 2675 // Make our StdNamespace cache point at the first real definition of the 2676 // "std" namespace. 2677 StdNamespace = Namespc; 2678 } 2679 2680 PushOnScopeChains(Namespc, DeclRegionScope); 2681 } else { 2682 // Anonymous namespaces. 2683 2684 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 2685 // behaves as if it were replaced by 2686 // namespace unique { /* empty body */ } 2687 // using namespace unique; 2688 // namespace unique { namespace-body } 2689 // where all occurrences of 'unique' in a translation unit are 2690 // replaced by the same identifier and this identifier differs 2691 // from all other identifiers in the entire program. 2692 2693 // We just create the namespace with an empty name and then add an 2694 // implicit using declaration, just like the standard suggests. 2695 // 2696 // CodeGen enforces the "universally unique" aspect by giving all 2697 // declarations semantically contained within an anonymous 2698 // namespace internal linkage. 2699 2700 assert(Namespc->isAnonymousNamespace()); 2701 CurContext->addDecl(Namespc); 2702 2703 UsingDirectiveDecl* UD 2704 = UsingDirectiveDecl::Create(Context, CurContext, 2705 /* 'using' */ LBrace, 2706 /* 'namespace' */ SourceLocation(), 2707 /* qualifier */ SourceRange(), 2708 /* NNS */ NULL, 2709 /* identifier */ SourceLocation(), 2710 Namespc, 2711 /* Ancestor */ CurContext); 2712 UD->setImplicit(); 2713 CurContext->addDecl(UD); 2714 } 2715 2716 // Although we could have an invalid decl (i.e. the namespace name is a 2717 // redefinition), push it as current DeclContext and try to continue parsing. 2718 // FIXME: We should be able to push Namespc here, so that the each DeclContext 2719 // for the namespace has the declarations that showed up in that particular 2720 // namespace definition. 2721 PushDeclContext(NamespcScope, Namespc); 2722 return DeclPtrTy::make(Namespc); 2723} 2724 2725/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2726/// is a namespace alias, returns the namespace it points to. 2727static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2728 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2729 return AD->getNamespace(); 2730 return dyn_cast_or_null<NamespaceDecl>(D); 2731} 2732 2733/// ActOnFinishNamespaceDef - This callback is called after a namespace is 2734/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 2735void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 2736 Decl *Dcl = D.getAs<Decl>(); 2737 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 2738 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 2739 Namespc->setRBracLoc(RBrace); 2740 PopDeclContext(); 2741} 2742 2743Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 2744 SourceLocation UsingLoc, 2745 SourceLocation NamespcLoc, 2746 const CXXScopeSpec &SS, 2747 SourceLocation IdentLoc, 2748 IdentifierInfo *NamespcName, 2749 AttributeList *AttrList) { 2750 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2751 assert(NamespcName && "Invalid NamespcName."); 2752 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 2753 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2754 2755 UsingDirectiveDecl *UDir = 0; 2756 2757 // Lookup namespace name. 2758 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 2759 LookupParsedName(R, S, &SS); 2760 if (R.isAmbiguous()) 2761 return DeclPtrTy(); 2762 2763 if (!R.empty()) { 2764 NamedDecl *Named = R.getFoundDecl(); 2765 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 2766 && "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 NamespaceDecl *NS = getNamespaceDecl(Named); 2780 DeclContext *CommonAncestor = cast<DeclContext>(NS); 2781 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 2782 CommonAncestor = CommonAncestor->getParent(); 2783 2784 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 2785 SS.getRange(), 2786 (NestedNameSpecifier *)SS.getScopeRep(), 2787 IdentLoc, Named, CommonAncestor); 2788 PushUsingDirective(S, UDir); 2789 } else { 2790 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2791 } 2792 2793 // FIXME: We ignore attributes for now. 2794 delete AttrList; 2795 return DeclPtrTy::make(UDir); 2796} 2797 2798void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2799 // If scope has associated entity, then using directive is at namespace 2800 // or translation unit scope. We add UsingDirectiveDecls, into 2801 // it's lookup structure. 2802 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2803 Ctx->addDecl(UDir); 2804 else 2805 // Otherwise it is block-sope. using-directives will affect lookup 2806 // only to the end of scope. 2807 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2808} 2809 2810 2811Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2812 AccessSpecifier AS, 2813 SourceLocation UsingLoc, 2814 const CXXScopeSpec &SS, 2815 UnqualifiedId &Name, 2816 AttributeList *AttrList, 2817 bool IsTypeName, 2818 SourceLocation TypenameLoc) { 2819 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2820 2821 switch (Name.getKind()) { 2822 case UnqualifiedId::IK_Identifier: 2823 case UnqualifiedId::IK_OperatorFunctionId: 2824 case UnqualifiedId::IK_ConversionFunctionId: 2825 break; 2826 2827 case UnqualifiedId::IK_ConstructorName: 2828 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 2829 << SS.getRange(); 2830 return DeclPtrTy(); 2831 2832 case UnqualifiedId::IK_DestructorName: 2833 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 2834 << SS.getRange(); 2835 return DeclPtrTy(); 2836 2837 case UnqualifiedId::IK_TemplateId: 2838 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 2839 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 2840 return DeclPtrTy(); 2841 } 2842 2843 DeclarationName TargetName = GetNameFromUnqualifiedId(Name); 2844 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 2845 Name.getSourceRange().getBegin(), 2846 TargetName, AttrList, 2847 /* IsInstantiation */ false, 2848 IsTypeName, TypenameLoc); 2849 if (UD) { 2850 PushOnScopeChains(UD, S); 2851 UD->setAccess(AS); 2852 } 2853 2854 return DeclPtrTy::make(UD); 2855} 2856 2857/// Builds a shadow declaration corresponding to a 'using' declaration. 2858static UsingShadowDecl *BuildUsingShadowDecl(Sema &SemaRef, Scope *S, 2859 AccessSpecifier AS, 2860 UsingDecl *UD, NamedDecl *Orig) { 2861 // FIXME: diagnose hiding, collisions 2862 2863 // If we resolved to another shadow declaration, just coalesce them. 2864 if (isa<UsingShadowDecl>(Orig)) { 2865 Orig = cast<UsingShadowDecl>(Orig)->getTargetDecl(); 2866 assert(!isa<UsingShadowDecl>(Orig) && "nested shadow declaration"); 2867 } 2868 2869 UsingShadowDecl *Shadow 2870 = UsingShadowDecl::Create(SemaRef.Context, SemaRef.CurContext, 2871 UD->getLocation(), UD, Orig); 2872 UD->addShadowDecl(Shadow); 2873 2874 if (S) 2875 SemaRef.PushOnScopeChains(Shadow, S); 2876 else 2877 SemaRef.CurContext->addDecl(Shadow); 2878 Shadow->setAccess(AS); 2879 2880 return Shadow; 2881} 2882 2883/// Builds a using declaration. 2884/// 2885/// \param IsInstantiation - Whether this call arises from an 2886/// instantiation of an unresolved using declaration. We treat 2887/// the lookup differently for these declarations. 2888NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 2889 SourceLocation UsingLoc, 2890 const CXXScopeSpec &SS, 2891 SourceLocation IdentLoc, 2892 DeclarationName Name, 2893 AttributeList *AttrList, 2894 bool IsInstantiation, 2895 bool IsTypeName, 2896 SourceLocation TypenameLoc) { 2897 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2898 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2899 2900 // FIXME: We ignore attributes for now. 2901 delete AttrList; 2902 2903 if (SS.isEmpty()) { 2904 Diag(IdentLoc, diag::err_using_requires_qualname); 2905 return 0; 2906 } 2907 2908 NestedNameSpecifier *NNS = 2909 static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 2910 2911 DeclContext *LookupContext = computeDeclContext(SS); 2912 if (!LookupContext) { 2913 if (IsTypeName) { 2914 return UnresolvedUsingTypenameDecl::Create(Context, CurContext, 2915 UsingLoc, TypenameLoc, 2916 SS.getRange(), NNS, 2917 IdentLoc, Name); 2918 } else { 2919 return UnresolvedUsingValueDecl::Create(Context, CurContext, 2920 UsingLoc, SS.getRange(), NNS, 2921 IdentLoc, Name); 2922 } 2923 } 2924 2925 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) { 2926 // C++0x N2914 [namespace.udecl]p3: 2927 // A using-declaration used as a member-declaration shall refer to a member 2928 // of a base class of the class being defined, shall refer to a member of an 2929 // anonymous union that is a member of a base class of the class being 2930 // defined, or shall refer to an enumerator for an enumeration type that is 2931 // a member of a base class of the class being defined. 2932 2933 CXXRecordDecl *LookupRD = dyn_cast<CXXRecordDecl>(LookupContext); 2934 if (!LookupRD || !RD->isDerivedFrom(LookupRD)) { 2935 Diag(SS.getRange().getBegin(), 2936 diag::err_using_decl_nested_name_specifier_is_not_a_base_class) 2937 << NNS << RD->getDeclName(); 2938 return 0; 2939 } 2940 } else { 2941 // C++0x N2914 [namespace.udecl]p8: 2942 // A using-declaration for a class member shall be a member-declaration. 2943 if (isa<CXXRecordDecl>(LookupContext)) { 2944 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_class_member) 2945 << SS.getRange(); 2946 return 0; 2947 } 2948 } 2949 2950 // Look up the target name. Unlike most lookups, we do not want to 2951 // hide tag declarations: tag names are visible through the using 2952 // declaration even if hidden by ordinary names. 2953 LookupResult R(*this, Name, IdentLoc, LookupOrdinaryName); 2954 2955 // We don't hide tags behind ordinary decls if we're in a 2956 // non-dependent context, but in a dependent context, this is 2957 // important for the stability of two-phase lookup. 2958 if (!IsInstantiation) 2959 R.setHideTags(false); 2960 2961 LookupQualifiedName(R, LookupContext); 2962 2963 if (R.empty()) { 2964 Diag(IdentLoc, diag::err_no_member) 2965 << Name << LookupContext << SS.getRange(); 2966 return 0; 2967 } 2968 2969 if (R.isAmbiguous()) 2970 return 0; 2971 2972 if (IsTypeName) { 2973 // If we asked for a typename and got a non-type decl, error out. 2974 if (R.getResultKind() != LookupResult::Found 2975 || !isa<TypeDecl>(R.getFoundDecl())) { 2976 Diag(IdentLoc, diag::err_using_typename_non_type); 2977 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 2978 Diag((*I)->getUnderlyingDecl()->getLocation(), 2979 diag::note_using_decl_target); 2980 return 0; 2981 } 2982 } else { 2983 // If we asked for a non-typename and we got a type, error out, 2984 // but only if this is an instantiation of an unresolved using 2985 // decl. Otherwise just silently find the type name. 2986 if (IsInstantiation && 2987 R.getResultKind() == LookupResult::Found && 2988 isa<TypeDecl>(R.getFoundDecl())) { 2989 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 2990 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 2991 return 0; 2992 } 2993 } 2994 2995 // C++0x N2914 [namespace.udecl]p6: 2996 // A using-declaration shall not name a namespace. 2997 if (R.getResultKind() == LookupResult::Found 2998 && isa<NamespaceDecl>(R.getFoundDecl())) { 2999 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 3000 << SS.getRange(); 3001 return 0; 3002 } 3003 3004 UsingDecl *UD = UsingDecl::Create(Context, CurContext, IdentLoc, 3005 SS.getRange(), UsingLoc, NNS, Name, 3006 IsTypeName); 3007 3008 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 3009 BuildUsingShadowDecl(*this, S, AS, UD, *I); 3010 3011 return UD; 3012} 3013 3014Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 3015 SourceLocation NamespaceLoc, 3016 SourceLocation AliasLoc, 3017 IdentifierInfo *Alias, 3018 const CXXScopeSpec &SS, 3019 SourceLocation IdentLoc, 3020 IdentifierInfo *Ident) { 3021 3022 // Lookup the namespace name. 3023 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 3024 LookupParsedName(R, S, &SS); 3025 3026 // Check if we have a previous declaration with the same name. 3027 if (NamedDecl *PrevDecl 3028 = LookupSingleName(S, Alias, LookupOrdinaryName, ForRedeclaration)) { 3029 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 3030 // We already have an alias with the same name that points to the same 3031 // namespace, so don't create a new one. 3032 if (!R.isAmbiguous() && !R.empty() && 3033 AD->getNamespace() == getNamespaceDecl(R.getFoundDecl())) 3034 return DeclPtrTy(); 3035 } 3036 3037 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 3038 diag::err_redefinition_different_kind; 3039 Diag(AliasLoc, DiagID) << Alias; 3040 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3041 return DeclPtrTy(); 3042 } 3043 3044 if (R.isAmbiguous()) 3045 return DeclPtrTy(); 3046 3047 if (R.empty()) { 3048 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 3049 return DeclPtrTy(); 3050 } 3051 3052 NamespaceAliasDecl *AliasDecl = 3053 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 3054 Alias, SS.getRange(), 3055 (NestedNameSpecifier *)SS.getScopeRep(), 3056 IdentLoc, R.getFoundDecl()); 3057 3058 CurContext->addDecl(AliasDecl); 3059 return DeclPtrTy::make(AliasDecl); 3060} 3061 3062void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 3063 CXXConstructorDecl *Constructor) { 3064 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 3065 !Constructor->isUsed()) && 3066 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 3067 3068 CXXRecordDecl *ClassDecl 3069 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 3070 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 3071 3072 if (SetBaseOrMemberInitializers(Constructor, 0, 0, true)) { 3073 Diag(CurrentLocation, diag::note_ctor_synthesized_at) 3074 << Context.getTagDeclType(ClassDecl); 3075 Constructor->setInvalidDecl(); 3076 } else { 3077 Constructor->setUsed(); 3078 } 3079 return; 3080} 3081 3082void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 3083 CXXDestructorDecl *Destructor) { 3084 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 3085 "DefineImplicitDestructor - call it for implicit default dtor"); 3086 CXXRecordDecl *ClassDecl = Destructor->getParent(); 3087 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 3088 // C++ [class.dtor] p5 3089 // Before the implicitly-declared default destructor for a class is 3090 // implicitly defined, all the implicitly-declared default destructors 3091 // for its base class and its non-static data members shall have been 3092 // implicitly defined. 3093 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3094 E = ClassDecl->bases_end(); Base != E; ++Base) { 3095 CXXRecordDecl *BaseClassDecl 3096 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3097 if (!BaseClassDecl->hasTrivialDestructor()) { 3098 if (CXXDestructorDecl *BaseDtor = 3099 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 3100 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 3101 else 3102 assert(false && 3103 "DefineImplicitDestructor - missing dtor in a base class"); 3104 } 3105 } 3106 3107 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3108 E = ClassDecl->field_end(); Field != E; ++Field) { 3109 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3110 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3111 FieldType = Array->getElementType(); 3112 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3113 CXXRecordDecl *FieldClassDecl 3114 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3115 if (!FieldClassDecl->hasTrivialDestructor()) { 3116 if (CXXDestructorDecl *FieldDtor = 3117 const_cast<CXXDestructorDecl*>( 3118 FieldClassDecl->getDestructor(Context))) 3119 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 3120 else 3121 assert(false && 3122 "DefineImplicitDestructor - missing dtor in class of a data member"); 3123 } 3124 } 3125 } 3126 Destructor->setUsed(); 3127} 3128 3129void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 3130 CXXMethodDecl *MethodDecl) { 3131 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 3132 MethodDecl->getOverloadedOperator() == OO_Equal && 3133 !MethodDecl->isUsed()) && 3134 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 3135 3136 CXXRecordDecl *ClassDecl 3137 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 3138 3139 // C++[class.copy] p12 3140 // Before the implicitly-declared copy assignment operator for a class is 3141 // implicitly defined, all implicitly-declared copy assignment operators 3142 // for its direct base classes and its nonstatic data members shall have 3143 // been implicitly defined. 3144 bool err = false; 3145 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3146 E = ClassDecl->bases_end(); Base != E; ++Base) { 3147 CXXRecordDecl *BaseClassDecl 3148 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3149 if (CXXMethodDecl *BaseAssignOpMethod = 3150 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 3151 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 3152 } 3153 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3154 E = ClassDecl->field_end(); Field != E; ++Field) { 3155 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3156 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3157 FieldType = Array->getElementType(); 3158 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3159 CXXRecordDecl *FieldClassDecl 3160 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3161 if (CXXMethodDecl *FieldAssignOpMethod = 3162 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 3163 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 3164 } else if (FieldType->isReferenceType()) { 3165 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3166 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 3167 Diag(Field->getLocation(), diag::note_declared_at); 3168 Diag(CurrentLocation, diag::note_first_required_here); 3169 err = true; 3170 } else if (FieldType.isConstQualified()) { 3171 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 3172 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 3173 Diag(Field->getLocation(), diag::note_declared_at); 3174 Diag(CurrentLocation, diag::note_first_required_here); 3175 err = true; 3176 } 3177 } 3178 if (!err) 3179 MethodDecl->setUsed(); 3180} 3181 3182CXXMethodDecl * 3183Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 3184 CXXRecordDecl *ClassDecl) { 3185 QualType LHSType = Context.getTypeDeclType(ClassDecl); 3186 QualType RHSType(LHSType); 3187 // If class's assignment operator argument is const/volatile qualified, 3188 // look for operator = (const/volatile B&). Otherwise, look for 3189 // operator = (B&). 3190 RHSType = Context.getCVRQualifiedType(RHSType, 3191 ParmDecl->getType().getCVRQualifiers()); 3192 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 3193 LHSType, 3194 SourceLocation())); 3195 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 3196 RHSType, 3197 SourceLocation())); 3198 Expr *Args[2] = { &*LHS, &*RHS }; 3199 OverloadCandidateSet CandidateSet; 3200 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 3201 CandidateSet); 3202 OverloadCandidateSet::iterator Best; 3203 if (BestViableFunction(CandidateSet, 3204 ClassDecl->getLocation(), Best) == OR_Success) 3205 return cast<CXXMethodDecl>(Best->Function); 3206 assert(false && 3207 "getAssignOperatorMethod - copy assignment operator method not found"); 3208 return 0; 3209} 3210 3211void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 3212 CXXConstructorDecl *CopyConstructor, 3213 unsigned TypeQuals) { 3214 assert((CopyConstructor->isImplicit() && 3215 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 3216 !CopyConstructor->isUsed()) && 3217 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 3218 3219 CXXRecordDecl *ClassDecl 3220 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 3221 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 3222 // C++ [class.copy] p209 3223 // Before the implicitly-declared copy constructor for a class is 3224 // implicitly defined, all the implicitly-declared copy constructors 3225 // for its base class and its non-static data members shall have been 3226 // implicitly defined. 3227 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 3228 Base != ClassDecl->bases_end(); ++Base) { 3229 CXXRecordDecl *BaseClassDecl 3230 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 3231 if (CXXConstructorDecl *BaseCopyCtor = 3232 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 3233 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 3234 } 3235 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3236 FieldEnd = ClassDecl->field_end(); 3237 Field != FieldEnd; ++Field) { 3238 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 3239 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 3240 FieldType = Array->getElementType(); 3241 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 3242 CXXRecordDecl *FieldClassDecl 3243 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 3244 if (CXXConstructorDecl *FieldCopyCtor = 3245 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 3246 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 3247 } 3248 } 3249 CopyConstructor->setUsed(); 3250} 3251 3252Sema::OwningExprResult 3253Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3254 CXXConstructorDecl *Constructor, 3255 MultiExprArg ExprArgs) { 3256 bool Elidable = false; 3257 3258 // C++ [class.copy]p15: 3259 // Whenever a temporary class object is copied using a copy constructor, and 3260 // this object and the copy have the same cv-unqualified type, an 3261 // implementation is permitted to treat the original and the copy as two 3262 // different ways of referring to the same object and not perform a copy at 3263 // all, even if the class copy constructor or destructor have side effects. 3264 3265 // FIXME: Is this enough? 3266 if (Constructor->isCopyConstructor(Context)) { 3267 Expr *E = ((Expr **)ExprArgs.get())[0]; 3268 while (CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 3269 E = BE->getSubExpr(); 3270 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 3271 if (ICE->getCastKind() == CastExpr::CK_NoOp) 3272 E = ICE->getSubExpr(); 3273 3274 if (isa<CallExpr>(E) || isa<CXXTemporaryObjectExpr>(E)) 3275 Elidable = true; 3276 } 3277 3278 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 3279 Elidable, move(ExprArgs)); 3280} 3281 3282/// BuildCXXConstructExpr - Creates a complete call to a constructor, 3283/// including handling of its default argument expressions. 3284Sema::OwningExprResult 3285Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 3286 CXXConstructorDecl *Constructor, bool Elidable, 3287 MultiExprArg ExprArgs) { 3288 unsigned NumExprs = ExprArgs.size(); 3289 Expr **Exprs = (Expr **)ExprArgs.release(); 3290 3291 MarkDeclarationReferenced(ConstructLoc, Constructor); 3292 return Owned(CXXConstructExpr::Create(Context, DeclInitType, Constructor, 3293 Elidable, Exprs, NumExprs)); 3294} 3295 3296Sema::OwningExprResult 3297Sema::BuildCXXTemporaryObjectExpr(CXXConstructorDecl *Constructor, 3298 QualType Ty, 3299 SourceLocation TyBeginLoc, 3300 MultiExprArg Args, 3301 SourceLocation RParenLoc) { 3302 unsigned NumExprs = Args.size(); 3303 Expr **Exprs = (Expr **)Args.release(); 3304 3305 MarkDeclarationReferenced(TyBeginLoc, Constructor); 3306 return Owned(new (Context) CXXTemporaryObjectExpr(Context, Constructor, Ty, 3307 TyBeginLoc, Exprs, 3308 NumExprs, RParenLoc)); 3309} 3310 3311 3312bool Sema::InitializeVarWithConstructor(VarDecl *VD, 3313 CXXConstructorDecl *Constructor, 3314 MultiExprArg Exprs) { 3315 OwningExprResult TempResult = 3316 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 3317 move(Exprs)); 3318 if (TempResult.isInvalid()) 3319 return true; 3320 3321 Expr *Temp = TempResult.takeAs<Expr>(); 3322 MarkDeclarationReferenced(VD->getLocation(), Constructor); 3323 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 3324 VD->setInit(Context, Temp); 3325 3326 return false; 3327} 3328 3329void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) { 3330 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 3331 DeclInitType->getAs<RecordType>()->getDecl()); 3332 if (!ClassDecl->hasTrivialDestructor()) 3333 if (CXXDestructorDecl *Destructor = 3334 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 3335 MarkDeclarationReferenced(VD->getLocation(), Destructor); 3336} 3337 3338/// AddCXXDirectInitializerToDecl - This action is called immediately after 3339/// ActOnDeclarator, when a C++ direct initializer is present. 3340/// e.g: "int x(1);" 3341void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 3342 SourceLocation LParenLoc, 3343 MultiExprArg Exprs, 3344 SourceLocation *CommaLocs, 3345 SourceLocation RParenLoc) { 3346 unsigned NumExprs = Exprs.size(); 3347 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 3348 Decl *RealDecl = Dcl.getAs<Decl>(); 3349 3350 // If there is no declaration, there was an error parsing it. Just ignore 3351 // the initializer. 3352 if (RealDecl == 0) 3353 return; 3354 3355 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3356 if (!VDecl) { 3357 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3358 RealDecl->setInvalidDecl(); 3359 return; 3360 } 3361 3362 // We will represent direct-initialization similarly to copy-initialization: 3363 // int x(1); -as-> int x = 1; 3364 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 3365 // 3366 // Clients that want to distinguish between the two forms, can check for 3367 // direct initializer using VarDecl::hasCXXDirectInitializer(). 3368 // A major benefit is that clients that don't particularly care about which 3369 // exactly form was it (like the CodeGen) can handle both cases without 3370 // special case code. 3371 3372 // If either the declaration has a dependent type or if any of the expressions 3373 // is type-dependent, we represent the initialization via a ParenListExpr for 3374 // later use during template instantiation. 3375 if (VDecl->getType()->isDependentType() || 3376 Expr::hasAnyTypeDependentArguments((Expr **)Exprs.get(), Exprs.size())) { 3377 // Let clients know that initialization was done with a direct initializer. 3378 VDecl->setCXXDirectInitializer(true); 3379 3380 // Store the initialization expressions as a ParenListExpr. 3381 unsigned NumExprs = Exprs.size(); 3382 VDecl->setInit(Context, 3383 new (Context) ParenListExpr(Context, LParenLoc, 3384 (Expr **)Exprs.release(), 3385 NumExprs, RParenLoc)); 3386 return; 3387 } 3388 3389 3390 // C++ 8.5p11: 3391 // The form of initialization (using parentheses or '=') is generally 3392 // insignificant, but does matter when the entity being initialized has a 3393 // class type. 3394 QualType DeclInitType = VDecl->getType(); 3395 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 3396 DeclInitType = Context.getBaseElementType(Array); 3397 3398 // FIXME: This isn't the right place to complete the type. 3399 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 3400 diag::err_typecheck_decl_incomplete_type)) { 3401 VDecl->setInvalidDecl(); 3402 return; 3403 } 3404 3405 if (VDecl->getType()->isRecordType()) { 3406 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this); 3407 3408 CXXConstructorDecl *Constructor 3409 = PerformInitializationByConstructor(DeclInitType, 3410 move(Exprs), 3411 VDecl->getLocation(), 3412 SourceRange(VDecl->getLocation(), 3413 RParenLoc), 3414 VDecl->getDeclName(), 3415 IK_Direct, 3416 ConstructorArgs); 3417 if (!Constructor) 3418 RealDecl->setInvalidDecl(); 3419 else { 3420 VDecl->setCXXDirectInitializer(true); 3421 if (InitializeVarWithConstructor(VDecl, Constructor, 3422 move_arg(ConstructorArgs))) 3423 RealDecl->setInvalidDecl(); 3424 FinalizeVarWithDestructor(VDecl, DeclInitType); 3425 } 3426 return; 3427 } 3428 3429 if (NumExprs > 1) { 3430 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 3431 << SourceRange(VDecl->getLocation(), RParenLoc); 3432 RealDecl->setInvalidDecl(); 3433 return; 3434 } 3435 3436 // Let clients know that initialization was done with a direct initializer. 3437 VDecl->setCXXDirectInitializer(true); 3438 3439 assert(NumExprs == 1 && "Expected 1 expression"); 3440 // Set the init expression, handles conversions. 3441 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 3442 /*DirectInit=*/true); 3443} 3444 3445/// \brief Add the applicable constructor candidates for an initialization 3446/// by constructor. 3447static void AddConstructorInitializationCandidates(Sema &SemaRef, 3448 QualType ClassType, 3449 Expr **Args, 3450 unsigned NumArgs, 3451 Sema::InitializationKind Kind, 3452 OverloadCandidateSet &CandidateSet) { 3453 // C++ [dcl.init]p14: 3454 // If the initialization is direct-initialization, or if it is 3455 // copy-initialization where the cv-unqualified version of the 3456 // source type is the same class as, or a derived class of, the 3457 // class of the destination, constructors are considered. The 3458 // applicable constructors are enumerated (13.3.1.3), and the 3459 // best one is chosen through overload resolution (13.3). The 3460 // constructor so selected is called to initialize the object, 3461 // with the initializer expression(s) as its argument(s). If no 3462 // constructor applies, or the overload resolution is ambiguous, 3463 // the initialization is ill-formed. 3464 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 3465 assert(ClassRec && "Can only initialize a class type here"); 3466 3467 // FIXME: When we decide not to synthesize the implicitly-declared 3468 // constructors, we'll need to make them appear here. 3469 3470 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 3471 DeclarationName ConstructorName 3472 = SemaRef.Context.DeclarationNames.getCXXConstructorName( 3473 SemaRef.Context.getCanonicalType(ClassType).getUnqualifiedType()); 3474 DeclContext::lookup_const_iterator Con, ConEnd; 3475 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 3476 Con != ConEnd; ++Con) { 3477 // Find the constructor (which may be a template). 3478 CXXConstructorDecl *Constructor = 0; 3479 FunctionTemplateDecl *ConstructorTmpl= dyn_cast<FunctionTemplateDecl>(*Con); 3480 if (ConstructorTmpl) 3481 Constructor 3482 = cast<CXXConstructorDecl>(ConstructorTmpl->getTemplatedDecl()); 3483 else 3484 Constructor = cast<CXXConstructorDecl>(*Con); 3485 3486 if ((Kind == Sema::IK_Direct) || 3487 (Kind == Sema::IK_Copy && 3488 Constructor->isConvertingConstructor(/*AllowExplicit=*/false)) || 3489 (Kind == Sema::IK_Default && Constructor->isDefaultConstructor())) { 3490 if (ConstructorTmpl) 3491 SemaRef.AddTemplateOverloadCandidate(ConstructorTmpl, 3492 /*ExplicitArgs*/ 0, 3493 Args, NumArgs, CandidateSet); 3494 else 3495 SemaRef.AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 3496 } 3497 } 3498} 3499 3500/// \brief Attempt to perform initialization by constructor 3501/// (C++ [dcl.init]p14), which may occur as part of direct-initialization or 3502/// copy-initialization. 3503/// 3504/// This routine determines whether initialization by constructor is possible, 3505/// but it does not emit any diagnostics in the case where the initialization 3506/// is ill-formed. 3507/// 3508/// \param ClassType the type of the object being initialized, which must have 3509/// class type. 3510/// 3511/// \param Args the arguments provided to initialize the object 3512/// 3513/// \param NumArgs the number of arguments provided to initialize the object 3514/// 3515/// \param Kind the type of initialization being performed 3516/// 3517/// \returns the constructor used to initialize the object, if successful. 3518/// Otherwise, emits a diagnostic and returns NULL. 3519CXXConstructorDecl * 3520Sema::TryInitializationByConstructor(QualType ClassType, 3521 Expr **Args, unsigned NumArgs, 3522 SourceLocation Loc, 3523 InitializationKind Kind) { 3524 // Build the overload candidate set 3525 OverloadCandidateSet CandidateSet; 3526 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 3527 CandidateSet); 3528 3529 // Determine whether we found a constructor we can use. 3530 OverloadCandidateSet::iterator Best; 3531 switch (BestViableFunction(CandidateSet, Loc, Best)) { 3532 case OR_Success: 3533 case OR_Deleted: 3534 // We found a constructor. Return it. 3535 return cast<CXXConstructorDecl>(Best->Function); 3536 3537 case OR_No_Viable_Function: 3538 case OR_Ambiguous: 3539 // Overload resolution failed. Return nothing. 3540 return 0; 3541 } 3542 3543 // Silence GCC warning 3544 return 0; 3545} 3546 3547/// \brief Perform initialization by constructor (C++ [dcl.init]p14), which 3548/// may occur as part of direct-initialization or copy-initialization. 3549/// 3550/// \param ClassType the type of the object being initialized, which must have 3551/// class type. 3552/// 3553/// \param ArgsPtr the arguments provided to initialize the object 3554/// 3555/// \param Loc the source location where the initialization occurs 3556/// 3557/// \param Range the source range that covers the entire initialization 3558/// 3559/// \param InitEntity the name of the entity being initialized, if known 3560/// 3561/// \param Kind the type of initialization being performed 3562/// 3563/// \param ConvertedArgs a vector that will be filled in with the 3564/// appropriately-converted arguments to the constructor (if initialization 3565/// succeeded). 3566/// 3567/// \returns the constructor used to initialize the object, if successful. 3568/// Otherwise, emits a diagnostic and returns NULL. 3569CXXConstructorDecl * 3570Sema::PerformInitializationByConstructor(QualType ClassType, 3571 MultiExprArg ArgsPtr, 3572 SourceLocation Loc, SourceRange Range, 3573 DeclarationName InitEntity, 3574 InitializationKind Kind, 3575 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3576 3577 // Build the overload candidate set 3578 Expr **Args = (Expr **)ArgsPtr.get(); 3579 unsigned NumArgs = ArgsPtr.size(); 3580 OverloadCandidateSet CandidateSet; 3581 AddConstructorInitializationCandidates(*this, ClassType, Args, NumArgs, Kind, 3582 CandidateSet); 3583 3584 OverloadCandidateSet::iterator Best; 3585 switch (BestViableFunction(CandidateSet, Loc, Best)) { 3586 case OR_Success: 3587 // We found a constructor. Break out so that we can convert the arguments 3588 // appropriately. 3589 break; 3590 3591 case OR_No_Viable_Function: 3592 if (InitEntity) 3593 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3594 << InitEntity << Range; 3595 else 3596 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 3597 << ClassType << Range; 3598 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 3599 return 0; 3600 3601 case OR_Ambiguous: 3602 if (InitEntity) 3603 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 3604 else 3605 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 3606 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3607 return 0; 3608 3609 case OR_Deleted: 3610 if (InitEntity) 3611 Diag(Loc, diag::err_ovl_deleted_init) 3612 << Best->Function->isDeleted() 3613 << InitEntity << Range; 3614 else { 3615 const CXXRecordDecl *RD = 3616 cast<CXXRecordDecl>(ClassType->getAs<RecordType>()->getDecl()); 3617 Diag(Loc, diag::err_ovl_deleted_init) 3618 << Best->Function->isDeleted() 3619 << RD->getDeclName() << Range; 3620 } 3621 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3622 return 0; 3623 } 3624 3625 // Convert the arguments, fill in default arguments, etc. 3626 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function); 3627 if (CompleteConstructorCall(Constructor, move(ArgsPtr), Loc, ConvertedArgs)) 3628 return 0; 3629 3630 return Constructor; 3631} 3632 3633/// \brief Given a constructor and the set of arguments provided for the 3634/// constructor, convert the arguments and add any required default arguments 3635/// to form a proper call to this constructor. 3636/// 3637/// \returns true if an error occurred, false otherwise. 3638bool 3639Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 3640 MultiExprArg ArgsPtr, 3641 SourceLocation Loc, 3642 ASTOwningVector<&ActionBase::DeleteExpr> &ConvertedArgs) { 3643 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 3644 unsigned NumArgs = ArgsPtr.size(); 3645 Expr **Args = (Expr **)ArgsPtr.get(); 3646 3647 const FunctionProtoType *Proto 3648 = Constructor->getType()->getAs<FunctionProtoType>(); 3649 assert(Proto && "Constructor without a prototype?"); 3650 unsigned NumArgsInProto = Proto->getNumArgs(); 3651 3652 // If too few arguments are available, we'll fill in the rest with defaults. 3653 if (NumArgs < NumArgsInProto) 3654 ConvertedArgs.reserve(NumArgsInProto); 3655 else 3656 ConvertedArgs.reserve(NumArgs); 3657 3658 VariadicCallType CallType = 3659 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 3660 llvm::SmallVector<Expr *, 8> AllArgs; 3661 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 3662 Proto, 0, Args, NumArgs, AllArgs, 3663 CallType); 3664 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 3665 ConvertedArgs.push_back(AllArgs[i]); 3666 return Invalid; 3667} 3668 3669/// CompareReferenceRelationship - Compare the two types T1 and T2 to 3670/// determine whether they are reference-related, 3671/// reference-compatible, reference-compatible with added 3672/// qualification, or incompatible, for use in C++ initialization by 3673/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 3674/// type, and the first type (T1) is the pointee type of the reference 3675/// type being initialized. 3676Sema::ReferenceCompareResult 3677Sema::CompareReferenceRelationship(SourceLocation Loc, 3678 QualType OrigT1, QualType OrigT2, 3679 bool& DerivedToBase) { 3680 assert(!OrigT1->isReferenceType() && 3681 "T1 must be the pointee type of the reference type"); 3682 assert(!OrigT2->isReferenceType() && "T2 cannot be a reference type"); 3683 3684 QualType T1 = Context.getCanonicalType(OrigT1); 3685 QualType T2 = Context.getCanonicalType(OrigT2); 3686 QualType UnqualT1 = T1.getLocalUnqualifiedType(); 3687 QualType UnqualT2 = T2.getLocalUnqualifiedType(); 3688 3689 // C++ [dcl.init.ref]p4: 3690 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 3691 // reference-related to "cv2 T2" if T1 is the same type as T2, or 3692 // T1 is a base class of T2. 3693 if (UnqualT1 == UnqualT2) 3694 DerivedToBase = false; 3695 else if (!RequireCompleteType(Loc, OrigT1, PDiag()) && 3696 !RequireCompleteType(Loc, OrigT2, PDiag()) && 3697 IsDerivedFrom(UnqualT2, UnqualT1)) 3698 DerivedToBase = true; 3699 else 3700 return Ref_Incompatible; 3701 3702 // At this point, we know that T1 and T2 are reference-related (at 3703 // least). 3704 3705 // C++ [dcl.init.ref]p4: 3706 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 3707 // reference-related to T2 and cv1 is the same cv-qualification 3708 // as, or greater cv-qualification than, cv2. For purposes of 3709 // overload resolution, cases for which cv1 is greater 3710 // cv-qualification than cv2 are identified as 3711 // reference-compatible with added qualification (see 13.3.3.2). 3712 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 3713 return Ref_Compatible; 3714 else if (T1.isMoreQualifiedThan(T2)) 3715 return Ref_Compatible_With_Added_Qualification; 3716 else 3717 return Ref_Related; 3718} 3719 3720/// CheckReferenceInit - Check the initialization of a reference 3721/// variable with the given initializer (C++ [dcl.init.ref]). Init is 3722/// the initializer (either a simple initializer or an initializer 3723/// list), and DeclType is the type of the declaration. When ICS is 3724/// non-null, this routine will compute the implicit conversion 3725/// sequence according to C++ [over.ics.ref] and will not produce any 3726/// diagnostics; when ICS is null, it will emit diagnostics when any 3727/// errors are found. Either way, a return value of true indicates 3728/// that there was a failure, a return value of false indicates that 3729/// the reference initialization succeeded. 3730/// 3731/// When @p SuppressUserConversions, user-defined conversions are 3732/// suppressed. 3733/// When @p AllowExplicit, we also permit explicit user-defined 3734/// conversion functions. 3735/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 3736/// When @p IgnoreBaseAccess, we don't do access control on to-base conversion. 3737/// This is used when this is called from a C-style cast. 3738bool 3739Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 3740 SourceLocation DeclLoc, 3741 bool SuppressUserConversions, 3742 bool AllowExplicit, bool ForceRValue, 3743 ImplicitConversionSequence *ICS, 3744 bool IgnoreBaseAccess) { 3745 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 3746 3747 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 3748 QualType T2 = Init->getType(); 3749 3750 // If the initializer is the address of an overloaded function, try 3751 // to resolve the overloaded function. If all goes well, T2 is the 3752 // type of the resulting function. 3753 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 3754 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 3755 ICS != 0); 3756 if (Fn) { 3757 // Since we're performing this reference-initialization for 3758 // real, update the initializer with the resulting function. 3759 if (!ICS) { 3760 if (DiagnoseUseOfDecl(Fn, DeclLoc)) 3761 return true; 3762 3763 Init = FixOverloadedFunctionReference(Init, Fn); 3764 } 3765 3766 T2 = Fn->getType(); 3767 } 3768 } 3769 3770 // Compute some basic properties of the types and the initializer. 3771 bool isRValRef = DeclType->isRValueReferenceType(); 3772 bool DerivedToBase = false; 3773 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 3774 Init->isLvalue(Context); 3775 ReferenceCompareResult RefRelationship 3776 = CompareReferenceRelationship(DeclLoc, T1, T2, DerivedToBase); 3777 3778 // Most paths end in a failed conversion. 3779 if (ICS) 3780 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 3781 3782 // C++ [dcl.init.ref]p5: 3783 // A reference to type "cv1 T1" is initialized by an expression 3784 // of type "cv2 T2" as follows: 3785 3786 // -- If the initializer expression 3787 3788 // Rvalue references cannot bind to lvalues (N2812). 3789 // There is absolutely no situation where they can. In particular, note that 3790 // this is ill-formed, even if B has a user-defined conversion to A&&: 3791 // B b; 3792 // A&& r = b; 3793 if (isRValRef && InitLvalue == Expr::LV_Valid) { 3794 if (!ICS) 3795 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 3796 << Init->getSourceRange(); 3797 return true; 3798 } 3799 3800 bool BindsDirectly = false; 3801 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 3802 // reference-compatible with "cv2 T2," or 3803 // 3804 // Note that the bit-field check is skipped if we are just computing 3805 // the implicit conversion sequence (C++ [over.best.ics]p2). 3806 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 3807 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 3808 BindsDirectly = true; 3809 3810 if (ICS) { 3811 // C++ [over.ics.ref]p1: 3812 // When a parameter of reference type binds directly (8.5.3) 3813 // to an argument expression, the implicit conversion sequence 3814 // is the identity conversion, unless the argument expression 3815 // has a type that is a derived class of the parameter type, 3816 // in which case the implicit conversion sequence is a 3817 // derived-to-base Conversion (13.3.3.1). 3818 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 3819 ICS->Standard.First = ICK_Identity; 3820 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 3821 ICS->Standard.Third = ICK_Identity; 3822 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 3823 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 3824 ICS->Standard.ReferenceBinding = true; 3825 ICS->Standard.DirectBinding = true; 3826 ICS->Standard.RRefBinding = false; 3827 ICS->Standard.CopyConstructor = 0; 3828 3829 // Nothing more to do: the inaccessibility/ambiguity check for 3830 // derived-to-base conversions is suppressed when we're 3831 // computing the implicit conversion sequence (C++ 3832 // [over.best.ics]p2). 3833 return false; 3834 } else { 3835 // Perform the conversion. 3836 CastExpr::CastKind CK = CastExpr::CK_NoOp; 3837 if (DerivedToBase) 3838 CK = CastExpr::CK_DerivedToBase; 3839 else if(CheckExceptionSpecCompatibility(Init, T1)) 3840 return true; 3841 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/true); 3842 } 3843 } 3844 3845 // -- has a class type (i.e., T2 is a class type) and can be 3846 // implicitly converted to an lvalue of type "cv3 T3," 3847 // where "cv1 T1" is reference-compatible with "cv3 T3" 3848 // 92) (this conversion is selected by enumerating the 3849 // applicable conversion functions (13.3.1.6) and choosing 3850 // the best one through overload resolution (13.3)), 3851 if (!isRValRef && !SuppressUserConversions && T2->isRecordType() && 3852 !RequireCompleteType(DeclLoc, T2, 0)) { 3853 CXXRecordDecl *T2RecordDecl 3854 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 3855 3856 OverloadCandidateSet CandidateSet; 3857 const UnresolvedSet *Conversions 3858 = T2RecordDecl->getVisibleConversionFunctions(); 3859 for (UnresolvedSet::iterator I = Conversions->begin(), 3860 E = Conversions->end(); I != E; ++I) { 3861 FunctionTemplateDecl *ConvTemplate 3862 = dyn_cast<FunctionTemplateDecl>(*I); 3863 CXXConversionDecl *Conv; 3864 if (ConvTemplate) 3865 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); 3866 else 3867 Conv = cast<CXXConversionDecl>(*I); 3868 3869 // If the conversion function doesn't return a reference type, 3870 // it can't be considered for this conversion. 3871 if (Conv->getConversionType()->isLValueReferenceType() && 3872 (AllowExplicit || !Conv->isExplicit())) { 3873 if (ConvTemplate) 3874 AddTemplateConversionCandidate(ConvTemplate, Init, DeclType, 3875 CandidateSet); 3876 else 3877 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 3878 } 3879 } 3880 3881 OverloadCandidateSet::iterator Best; 3882 switch (BestViableFunction(CandidateSet, DeclLoc, Best)) { 3883 case OR_Success: 3884 // This is a direct binding. 3885 BindsDirectly = true; 3886 3887 if (ICS) { 3888 // C++ [over.ics.ref]p1: 3889 // 3890 // [...] If the parameter binds directly to the result of 3891 // applying a conversion function to the argument 3892 // expression, the implicit conversion sequence is a 3893 // user-defined conversion sequence (13.3.3.1.2), with the 3894 // second standard conversion sequence either an identity 3895 // conversion or, if the conversion function returns an 3896 // entity of a type that is a derived class of the parameter 3897 // type, a derived-to-base Conversion. 3898 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 3899 ICS->UserDefined.Before = Best->Conversions[0].Standard; 3900 ICS->UserDefined.After = Best->FinalConversion; 3901 ICS->UserDefined.ConversionFunction = Best->Function; 3902 ICS->UserDefined.EllipsisConversion = false; 3903 assert(ICS->UserDefined.After.ReferenceBinding && 3904 ICS->UserDefined.After.DirectBinding && 3905 "Expected a direct reference binding!"); 3906 return false; 3907 } else { 3908 OwningExprResult InitConversion = 3909 BuildCXXCastArgument(DeclLoc, QualType(), 3910 CastExpr::CK_UserDefinedConversion, 3911 cast<CXXMethodDecl>(Best->Function), 3912 Owned(Init)); 3913 Init = InitConversion.takeAs<Expr>(); 3914 3915 if (CheckExceptionSpecCompatibility(Init, T1)) 3916 return true; 3917 ImpCastExprToType(Init, T1, CastExpr::CK_UserDefinedConversion, 3918 /*isLvalue=*/true); 3919 } 3920 break; 3921 3922 case OR_Ambiguous: 3923 if (ICS) { 3924 for (OverloadCandidateSet::iterator Cand = CandidateSet.begin(); 3925 Cand != CandidateSet.end(); ++Cand) 3926 if (Cand->Viable) 3927 ICS->ConversionFunctionSet.push_back(Cand->Function); 3928 break; 3929 } 3930 Diag(DeclLoc, diag::err_ref_init_ambiguous) << DeclType << Init->getType() 3931 << Init->getSourceRange(); 3932 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3933 return true; 3934 3935 case OR_No_Viable_Function: 3936 case OR_Deleted: 3937 // There was no suitable conversion, or we found a deleted 3938 // conversion; continue with other checks. 3939 break; 3940 } 3941 } 3942 3943 if (BindsDirectly) { 3944 // C++ [dcl.init.ref]p4: 3945 // [...] In all cases where the reference-related or 3946 // reference-compatible relationship of two types is used to 3947 // establish the validity of a reference binding, and T1 is a 3948 // base class of T2, a program that necessitates such a binding 3949 // is ill-formed if T1 is an inaccessible (clause 11) or 3950 // ambiguous (10.2) base class of T2. 3951 // 3952 // Note that we only check this condition when we're allowed to 3953 // complain about errors, because we should not be checking for 3954 // ambiguity (or inaccessibility) unless the reference binding 3955 // actually happens. 3956 if (DerivedToBase) 3957 return CheckDerivedToBaseConversion(T2, T1, DeclLoc, 3958 Init->getSourceRange(), 3959 IgnoreBaseAccess); 3960 else 3961 return false; 3962 } 3963 3964 // -- Otherwise, the reference shall be to a non-volatile const 3965 // type (i.e., cv1 shall be const), or the reference shall be an 3966 // rvalue reference and the initializer expression shall be an rvalue. 3967 if (!isRValRef && T1.getCVRQualifiers() != Qualifiers::Const) { 3968 if (!ICS) 3969 Diag(DeclLoc, diag::err_not_reference_to_const_init) 3970 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 3971 << T2 << Init->getSourceRange(); 3972 return true; 3973 } 3974 3975 // -- If the initializer expression is an rvalue, with T2 a 3976 // class type, and "cv1 T1" is reference-compatible with 3977 // "cv2 T2," the reference is bound in one of the 3978 // following ways (the choice is implementation-defined): 3979 // 3980 // -- The reference is bound to the object represented by 3981 // the rvalue (see 3.10) or to a sub-object within that 3982 // object. 3983 // 3984 // -- A temporary of type "cv1 T2" [sic] is created, and 3985 // a constructor is called to copy the entire rvalue 3986 // object into the temporary. The reference is bound to 3987 // the temporary or to a sub-object within the 3988 // temporary. 3989 // 3990 // The constructor that would be used to make the copy 3991 // shall be callable whether or not the copy is actually 3992 // done. 3993 // 3994 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 3995 // freedom, so we will always take the first option and never build 3996 // a temporary in this case. FIXME: We will, however, have to check 3997 // for the presence of a copy constructor in C++98/03 mode. 3998 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 3999 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 4000 if (ICS) { 4001 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 4002 ICS->Standard.First = ICK_Identity; 4003 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 4004 ICS->Standard.Third = ICK_Identity; 4005 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 4006 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 4007 ICS->Standard.ReferenceBinding = true; 4008 ICS->Standard.DirectBinding = false; 4009 ICS->Standard.RRefBinding = isRValRef; 4010 ICS->Standard.CopyConstructor = 0; 4011 } else { 4012 CastExpr::CastKind CK = CastExpr::CK_NoOp; 4013 if (DerivedToBase) 4014 CK = CastExpr::CK_DerivedToBase; 4015 else if(CheckExceptionSpecCompatibility(Init, T1)) 4016 return true; 4017 ImpCastExprToType(Init, T1, CK, /*isLvalue=*/false); 4018 } 4019 return false; 4020 } 4021 4022 // -- Otherwise, a temporary of type "cv1 T1" is created and 4023 // initialized from the initializer expression using the 4024 // rules for a non-reference copy initialization (8.5). The 4025 // reference is then bound to the temporary. If T1 is 4026 // reference-related to T2, cv1 must be the same 4027 // cv-qualification as, or greater cv-qualification than, 4028 // cv2; otherwise, the program is ill-formed. 4029 if (RefRelationship == Ref_Related) { 4030 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 4031 // we would be reference-compatible or reference-compatible with 4032 // added qualification. But that wasn't the case, so the reference 4033 // initialization fails. 4034 if (!ICS) 4035 Diag(DeclLoc, diag::err_reference_init_drops_quals) 4036 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 4037 << T2 << Init->getSourceRange(); 4038 return true; 4039 } 4040 4041 // If at least one of the types is a class type, the types are not 4042 // related, and we aren't allowed any user conversions, the 4043 // reference binding fails. This case is important for breaking 4044 // recursion, since TryImplicitConversion below will attempt to 4045 // create a temporary through the use of a copy constructor. 4046 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 4047 (T1->isRecordType() || T2->isRecordType())) { 4048 if (!ICS) 4049 Diag(DeclLoc, diag::err_typecheck_convert_incompatible) 4050 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 4051 return true; 4052 } 4053 4054 // Actually try to convert the initializer to T1. 4055 if (ICS) { 4056 // C++ [over.ics.ref]p2: 4057 // 4058 // When a parameter of reference type is not bound directly to 4059 // an argument expression, the conversion sequence is the one 4060 // required to convert the argument expression to the 4061 // underlying type of the reference according to 4062 // 13.3.3.1. Conceptually, this conversion sequence corresponds 4063 // to copy-initializing a temporary of the underlying type with 4064 // the argument expression. Any difference in top-level 4065 // cv-qualification is subsumed by the initialization itself 4066 // and does not constitute a conversion. 4067 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions, 4068 /*AllowExplicit=*/false, 4069 /*ForceRValue=*/false, 4070 /*InOverloadResolution=*/false); 4071 4072 // Of course, that's still a reference binding. 4073 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 4074 ICS->Standard.ReferenceBinding = true; 4075 ICS->Standard.RRefBinding = isRValRef; 4076 } else if (ICS->ConversionKind == 4077 ImplicitConversionSequence::UserDefinedConversion) { 4078 ICS->UserDefined.After.ReferenceBinding = true; 4079 ICS->UserDefined.After.RRefBinding = isRValRef; 4080 } 4081 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 4082 } else { 4083 ImplicitConversionSequence Conversions; 4084 bool badConversion = PerformImplicitConversion(Init, T1, "initializing", 4085 false, false, 4086 Conversions); 4087 if (badConversion) { 4088 if ((Conversions.ConversionKind == 4089 ImplicitConversionSequence::BadConversion) 4090 && !Conversions.ConversionFunctionSet.empty()) { 4091 Diag(DeclLoc, 4092 diag::err_lvalue_to_rvalue_ambig_ref) << Init->getSourceRange(); 4093 for (int j = Conversions.ConversionFunctionSet.size()-1; 4094 j >= 0; j--) { 4095 FunctionDecl *Func = Conversions.ConversionFunctionSet[j]; 4096 Diag(Func->getLocation(), diag::err_ovl_candidate); 4097 } 4098 } 4099 else { 4100 if (isRValRef) 4101 Diag(DeclLoc, diag::err_lvalue_to_rvalue_ref) 4102 << Init->getSourceRange(); 4103 else 4104 Diag(DeclLoc, diag::err_invalid_initialization) 4105 << DeclType << Init->getType() << Init->getSourceRange(); 4106 } 4107 } 4108 return badConversion; 4109 } 4110} 4111 4112/// CheckOverloadedOperatorDeclaration - Check whether the declaration 4113/// of this overloaded operator is well-formed. If so, returns false; 4114/// otherwise, emits appropriate diagnostics and returns true. 4115bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 4116 assert(FnDecl && FnDecl->isOverloadedOperator() && 4117 "Expected an overloaded operator declaration"); 4118 4119 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 4120 4121 // C++ [over.oper]p5: 4122 // The allocation and deallocation functions, operator new, 4123 // operator new[], operator delete and operator delete[], are 4124 // described completely in 3.7.3. The attributes and restrictions 4125 // found in the rest of this subclause do not apply to them unless 4126 // explicitly stated in 3.7.3. 4127 // FIXME: Write a separate routine for checking this. For now, just allow it. 4128 if (Op == OO_Delete || Op == OO_Array_Delete) 4129 return false; 4130 4131 if (Op == OO_New || Op == OO_Array_New) { 4132 bool ret = false; 4133 if (FunctionDecl::param_iterator Param = FnDecl->param_begin()) { 4134 QualType SizeTy = Context.getCanonicalType(Context.getSizeType()); 4135 QualType T = Context.getCanonicalType((*Param)->getType()); 4136 if (!T->isDependentType() && SizeTy != T) { 4137 Diag(FnDecl->getLocation(), 4138 diag::err_operator_new_param_type) << FnDecl->getDeclName() 4139 << SizeTy; 4140 ret = true; 4141 } 4142 } 4143 QualType ResultTy = Context.getCanonicalType(FnDecl->getResultType()); 4144 if (!ResultTy->isDependentType() && ResultTy != Context.VoidPtrTy) 4145 return Diag(FnDecl->getLocation(), 4146 diag::err_operator_new_result_type) << FnDecl->getDeclName() 4147 << static_cast<QualType>(Context.VoidPtrTy); 4148 return ret; 4149 } 4150 4151 // C++ [over.oper]p6: 4152 // An operator function shall either be a non-static member 4153 // function or be a non-member function and have at least one 4154 // parameter whose type is a class, a reference to a class, an 4155 // enumeration, or a reference to an enumeration. 4156 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 4157 if (MethodDecl->isStatic()) 4158 return Diag(FnDecl->getLocation(), 4159 diag::err_operator_overload_static) << FnDecl->getDeclName(); 4160 } else { 4161 bool ClassOrEnumParam = false; 4162 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 4163 ParamEnd = FnDecl->param_end(); 4164 Param != ParamEnd; ++Param) { 4165 QualType ParamType = (*Param)->getType().getNonReferenceType(); 4166 if (ParamType->isDependentType() || ParamType->isRecordType() || 4167 ParamType->isEnumeralType()) { 4168 ClassOrEnumParam = true; 4169 break; 4170 } 4171 } 4172 4173 if (!ClassOrEnumParam) 4174 return Diag(FnDecl->getLocation(), 4175 diag::err_operator_overload_needs_class_or_enum) 4176 << FnDecl->getDeclName(); 4177 } 4178 4179 // C++ [over.oper]p8: 4180 // An operator function cannot have default arguments (8.3.6), 4181 // except where explicitly stated below. 4182 // 4183 // Only the function-call operator allows default arguments 4184 // (C++ [over.call]p1). 4185 if (Op != OO_Call) { 4186 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 4187 Param != FnDecl->param_end(); ++Param) { 4188 if ((*Param)->hasUnparsedDefaultArg()) 4189 return Diag((*Param)->getLocation(), 4190 diag::err_operator_overload_default_arg) 4191 << FnDecl->getDeclName(); 4192 else if (Expr *DefArg = (*Param)->getDefaultArg()) 4193 return Diag((*Param)->getLocation(), 4194 diag::err_operator_overload_default_arg) 4195 << FnDecl->getDeclName() << DefArg->getSourceRange(); 4196 } 4197 } 4198 4199 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 4200 { false, false, false } 4201#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 4202 , { Unary, Binary, MemberOnly } 4203#include "clang/Basic/OperatorKinds.def" 4204 }; 4205 4206 bool CanBeUnaryOperator = OperatorUses[Op][0]; 4207 bool CanBeBinaryOperator = OperatorUses[Op][1]; 4208 bool MustBeMemberOperator = OperatorUses[Op][2]; 4209 4210 // C++ [over.oper]p8: 4211 // [...] Operator functions cannot have more or fewer parameters 4212 // than the number required for the corresponding operator, as 4213 // described in the rest of this subclause. 4214 unsigned NumParams = FnDecl->getNumParams() 4215 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 4216 if (Op != OO_Call && 4217 ((NumParams == 1 && !CanBeUnaryOperator) || 4218 (NumParams == 2 && !CanBeBinaryOperator) || 4219 (NumParams < 1) || (NumParams > 2))) { 4220 // We have the wrong number of parameters. 4221 unsigned ErrorKind; 4222 if (CanBeUnaryOperator && CanBeBinaryOperator) { 4223 ErrorKind = 2; // 2 -> unary or binary. 4224 } else if (CanBeUnaryOperator) { 4225 ErrorKind = 0; // 0 -> unary 4226 } else { 4227 assert(CanBeBinaryOperator && 4228 "All non-call overloaded operators are unary or binary!"); 4229 ErrorKind = 1; // 1 -> binary 4230 } 4231 4232 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 4233 << FnDecl->getDeclName() << NumParams << ErrorKind; 4234 } 4235 4236 // Overloaded operators other than operator() cannot be variadic. 4237 if (Op != OO_Call && 4238 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 4239 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 4240 << FnDecl->getDeclName(); 4241 } 4242 4243 // Some operators must be non-static member functions. 4244 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 4245 return Diag(FnDecl->getLocation(), 4246 diag::err_operator_overload_must_be_member) 4247 << FnDecl->getDeclName(); 4248 } 4249 4250 // C++ [over.inc]p1: 4251 // The user-defined function called operator++ implements the 4252 // prefix and postfix ++ operator. If this function is a member 4253 // function with no parameters, or a non-member function with one 4254 // parameter of class or enumeration type, it defines the prefix 4255 // increment operator ++ for objects of that type. If the function 4256 // is a member function with one parameter (which shall be of type 4257 // int) or a non-member function with two parameters (the second 4258 // of which shall be of type int), it defines the postfix 4259 // increment operator ++ for objects of that type. 4260 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 4261 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 4262 bool ParamIsInt = false; 4263 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 4264 ParamIsInt = BT->getKind() == BuiltinType::Int; 4265 4266 if (!ParamIsInt) 4267 return Diag(LastParam->getLocation(), 4268 diag::err_operator_overload_post_incdec_must_be_int) 4269 << LastParam->getType() << (Op == OO_MinusMinus); 4270 } 4271 4272 // Notify the class if it got an assignment operator. 4273 if (Op == OO_Equal) { 4274 // Would have returned earlier otherwise. 4275 assert(isa<CXXMethodDecl>(FnDecl) && 4276 "Overloaded = not member, but not filtered."); 4277 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 4278 Method->getParent()->addedAssignmentOperator(Context, Method); 4279 } 4280 4281 return false; 4282} 4283 4284/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 4285/// linkage specification, including the language and (if present) 4286/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 4287/// the location of the language string literal, which is provided 4288/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 4289/// the '{' brace. Otherwise, this linkage specification does not 4290/// have any braces. 4291Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 4292 SourceLocation ExternLoc, 4293 SourceLocation LangLoc, 4294 const char *Lang, 4295 unsigned StrSize, 4296 SourceLocation LBraceLoc) { 4297 LinkageSpecDecl::LanguageIDs Language; 4298 if (strncmp(Lang, "\"C\"", StrSize) == 0) 4299 Language = LinkageSpecDecl::lang_c; 4300 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 4301 Language = LinkageSpecDecl::lang_cxx; 4302 else { 4303 Diag(LangLoc, diag::err_bad_language); 4304 return DeclPtrTy(); 4305 } 4306 4307 // FIXME: Add all the various semantics of linkage specifications 4308 4309 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 4310 LangLoc, Language, 4311 LBraceLoc.isValid()); 4312 CurContext->addDecl(D); 4313 PushDeclContext(S, D); 4314 return DeclPtrTy::make(D); 4315} 4316 4317/// ActOnFinishLinkageSpecification - Completely the definition of 4318/// the C++ linkage specification LinkageSpec. If RBraceLoc is 4319/// valid, it's the position of the closing '}' brace in a linkage 4320/// specification that uses braces. 4321Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 4322 DeclPtrTy LinkageSpec, 4323 SourceLocation RBraceLoc) { 4324 if (LinkageSpec) 4325 PopDeclContext(); 4326 return LinkageSpec; 4327} 4328 4329/// \brief Perform semantic analysis for the variable declaration that 4330/// occurs within a C++ catch clause, returning the newly-created 4331/// variable. 4332VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 4333 DeclaratorInfo *DInfo, 4334 IdentifierInfo *Name, 4335 SourceLocation Loc, 4336 SourceRange Range) { 4337 bool Invalid = false; 4338 4339 // Arrays and functions decay. 4340 if (ExDeclType->isArrayType()) 4341 ExDeclType = Context.getArrayDecayedType(ExDeclType); 4342 else if (ExDeclType->isFunctionType()) 4343 ExDeclType = Context.getPointerType(ExDeclType); 4344 4345 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 4346 // The exception-declaration shall not denote a pointer or reference to an 4347 // incomplete type, other than [cv] void*. 4348 // N2844 forbids rvalue references. 4349 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 4350 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 4351 Invalid = true; 4352 } 4353 4354 QualType BaseType = ExDeclType; 4355 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 4356 unsigned DK = diag::err_catch_incomplete; 4357 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 4358 BaseType = Ptr->getPointeeType(); 4359 Mode = 1; 4360 DK = diag::err_catch_incomplete_ptr; 4361 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 4362 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 4363 BaseType = Ref->getPointeeType(); 4364 Mode = 2; 4365 DK = diag::err_catch_incomplete_ref; 4366 } 4367 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 4368 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 4369 Invalid = true; 4370 4371 if (!Invalid && !ExDeclType->isDependentType() && 4372 RequireNonAbstractType(Loc, ExDeclType, 4373 diag::err_abstract_type_in_decl, 4374 AbstractVariableType)) 4375 Invalid = true; 4376 4377 // FIXME: Need to test for ability to copy-construct and destroy the 4378 // exception variable. 4379 4380 // FIXME: Need to check for abstract classes. 4381 4382 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 4383 Name, ExDeclType, DInfo, VarDecl::None); 4384 4385 if (Invalid) 4386 ExDecl->setInvalidDecl(); 4387 4388 return ExDecl; 4389} 4390 4391/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 4392/// handler. 4393Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 4394 DeclaratorInfo *DInfo = 0; 4395 QualType ExDeclType = GetTypeForDeclarator(D, S, &DInfo); 4396 4397 bool Invalid = D.isInvalidType(); 4398 IdentifierInfo *II = D.getIdentifier(); 4399 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 4400 // The scope should be freshly made just for us. There is just no way 4401 // it contains any previous declaration. 4402 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 4403 if (PrevDecl->isTemplateParameter()) { 4404 // Maybe we will complain about the shadowed template parameter. 4405 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4406 } 4407 } 4408 4409 if (D.getCXXScopeSpec().isSet() && !Invalid) { 4410 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 4411 << D.getCXXScopeSpec().getRange(); 4412 Invalid = true; 4413 } 4414 4415 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, DInfo, 4416 D.getIdentifier(), 4417 D.getIdentifierLoc(), 4418 D.getDeclSpec().getSourceRange()); 4419 4420 if (Invalid) 4421 ExDecl->setInvalidDecl(); 4422 4423 // Add the exception declaration into this scope. 4424 if (II) 4425 PushOnScopeChains(ExDecl, S); 4426 else 4427 CurContext->addDecl(ExDecl); 4428 4429 ProcessDeclAttributes(S, ExDecl, D); 4430 return DeclPtrTy::make(ExDecl); 4431} 4432 4433Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 4434 ExprArg assertexpr, 4435 ExprArg assertmessageexpr) { 4436 Expr *AssertExpr = (Expr *)assertexpr.get(); 4437 StringLiteral *AssertMessage = 4438 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 4439 4440 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 4441 llvm::APSInt Value(32); 4442 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 4443 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 4444 AssertExpr->getSourceRange(); 4445 return DeclPtrTy(); 4446 } 4447 4448 if (Value == 0) { 4449 std::string str(AssertMessage->getStrData(), 4450 AssertMessage->getByteLength()); 4451 Diag(AssertLoc, diag::err_static_assert_failed) 4452 << str << AssertExpr->getSourceRange(); 4453 } 4454 } 4455 4456 assertexpr.release(); 4457 assertmessageexpr.release(); 4458 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 4459 AssertExpr, AssertMessage); 4460 4461 CurContext->addDecl(Decl); 4462 return DeclPtrTy::make(Decl); 4463} 4464 4465/// Handle a friend type declaration. This works in tandem with 4466/// ActOnTag. 4467/// 4468/// Notes on friend class templates: 4469/// 4470/// We generally treat friend class declarations as if they were 4471/// declaring a class. So, for example, the elaborated type specifier 4472/// in a friend declaration is required to obey the restrictions of a 4473/// class-head (i.e. no typedefs in the scope chain), template 4474/// parameters are required to match up with simple template-ids, &c. 4475/// However, unlike when declaring a template specialization, it's 4476/// okay to refer to a template specialization without an empty 4477/// template parameter declaration, e.g. 4478/// friend class A<T>::B<unsigned>; 4479/// We permit this as a special case; if there are any template 4480/// parameters present at all, require proper matching, i.e. 4481/// template <> template <class T> friend class A<int>::B; 4482Sema::DeclPtrTy Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 4483 MultiTemplateParamsArg TempParams) { 4484 SourceLocation Loc = DS.getSourceRange().getBegin(); 4485 4486 assert(DS.isFriendSpecified()); 4487 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4488 4489 // Try to convert the decl specifier to a type. This works for 4490 // friend templates because ActOnTag never produces a ClassTemplateDecl 4491 // for a TUK_Friend. 4492 Declarator TheDeclarator(DS, Declarator::MemberContext); 4493 QualType T = GetTypeForDeclarator(TheDeclarator, S); 4494 if (TheDeclarator.isInvalidType()) 4495 return DeclPtrTy(); 4496 4497 // This is definitely an error in C++98. It's probably meant to 4498 // be forbidden in C++0x, too, but the specification is just 4499 // poorly written. 4500 // 4501 // The problem is with declarations like the following: 4502 // template <T> friend A<T>::foo; 4503 // where deciding whether a class C is a friend or not now hinges 4504 // on whether there exists an instantiation of A that causes 4505 // 'foo' to equal C. There are restrictions on class-heads 4506 // (which we declare (by fiat) elaborated friend declarations to 4507 // be) that makes this tractable. 4508 // 4509 // FIXME: handle "template <> friend class A<T>;", which 4510 // is possibly well-formed? Who even knows? 4511 if (TempParams.size() && !isa<ElaboratedType>(T)) { 4512 Diag(Loc, diag::err_tagless_friend_type_template) 4513 << DS.getSourceRange(); 4514 return DeclPtrTy(); 4515 } 4516 4517 // C++ [class.friend]p2: 4518 // An elaborated-type-specifier shall be used in a friend declaration 4519 // for a class.* 4520 // * The class-key of the elaborated-type-specifier is required. 4521 // This is one of the rare places in Clang where it's legitimate to 4522 // ask about the "spelling" of the type. 4523 if (!getLangOptions().CPlusPlus0x && !isa<ElaboratedType>(T)) { 4524 // If we evaluated the type to a record type, suggest putting 4525 // a tag in front. 4526 if (const RecordType *RT = T->getAs<RecordType>()) { 4527 RecordDecl *RD = RT->getDecl(); 4528 4529 std::string InsertionText = std::string(" ") + RD->getKindName(); 4530 4531 Diag(DS.getTypeSpecTypeLoc(), diag::err_unelaborated_friend_type) 4532 << (unsigned) RD->getTagKind() 4533 << T 4534 << SourceRange(DS.getFriendSpecLoc()) 4535 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 4536 InsertionText); 4537 return DeclPtrTy(); 4538 }else { 4539 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 4540 << DS.getSourceRange(); 4541 return DeclPtrTy(); 4542 } 4543 } 4544 4545 // Enum types cannot be friends. 4546 if (T->getAs<EnumType>()) { 4547 Diag(DS.getTypeSpecTypeLoc(), diag::err_enum_friend) 4548 << SourceRange(DS.getFriendSpecLoc()); 4549 return DeclPtrTy(); 4550 } 4551 4552 // C++98 [class.friend]p1: A friend of a class is a function 4553 // or class that is not a member of the class . . . 4554 // But that's a silly restriction which nobody implements for 4555 // inner classes, and C++0x removes it anyway, so we only report 4556 // this (as a warning) if we're being pedantic. 4557 if (!getLangOptions().CPlusPlus0x) 4558 if (const RecordType *RT = T->getAs<RecordType>()) 4559 if (RT->getDecl()->getDeclContext() == CurContext) 4560 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 4561 4562 Decl *D; 4563 if (TempParams.size()) 4564 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 4565 TempParams.size(), 4566 (TemplateParameterList**) TempParams.release(), 4567 T.getTypePtr(), 4568 DS.getFriendSpecLoc()); 4569 else 4570 D = FriendDecl::Create(Context, CurContext, Loc, T.getTypePtr(), 4571 DS.getFriendSpecLoc()); 4572 D->setAccess(AS_public); 4573 CurContext->addDecl(D); 4574 4575 return DeclPtrTy::make(D); 4576} 4577 4578Sema::DeclPtrTy 4579Sema::ActOnFriendFunctionDecl(Scope *S, 4580 Declarator &D, 4581 bool IsDefinition, 4582 MultiTemplateParamsArg TemplateParams) { 4583 const DeclSpec &DS = D.getDeclSpec(); 4584 4585 assert(DS.isFriendSpecified()); 4586 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 4587 4588 SourceLocation Loc = D.getIdentifierLoc(); 4589 DeclaratorInfo *DInfo = 0; 4590 QualType T = GetTypeForDeclarator(D, S, &DInfo); 4591 4592 // C++ [class.friend]p1 4593 // A friend of a class is a function or class.... 4594 // Note that this sees through typedefs, which is intended. 4595 // It *doesn't* see through dependent types, which is correct 4596 // according to [temp.arg.type]p3: 4597 // If a declaration acquires a function type through a 4598 // type dependent on a template-parameter and this causes 4599 // a declaration that does not use the syntactic form of a 4600 // function declarator to have a function type, the program 4601 // is ill-formed. 4602 if (!T->isFunctionType()) { 4603 Diag(Loc, diag::err_unexpected_friend); 4604 4605 // It might be worthwhile to try to recover by creating an 4606 // appropriate declaration. 4607 return DeclPtrTy(); 4608 } 4609 4610 // C++ [namespace.memdef]p3 4611 // - If a friend declaration in a non-local class first declares a 4612 // class or function, the friend class or function is a member 4613 // of the innermost enclosing namespace. 4614 // - The name of the friend is not found by simple name lookup 4615 // until a matching declaration is provided in that namespace 4616 // scope (either before or after the class declaration granting 4617 // friendship). 4618 // - If a friend function is called, its name may be found by the 4619 // name lookup that considers functions from namespaces and 4620 // classes associated with the types of the function arguments. 4621 // - When looking for a prior declaration of a class or a function 4622 // declared as a friend, scopes outside the innermost enclosing 4623 // namespace scope are not considered. 4624 4625 CXXScopeSpec &ScopeQual = D.getCXXScopeSpec(); 4626 DeclarationName Name = GetNameForDeclarator(D); 4627 assert(Name); 4628 4629 // The context we found the declaration in, or in which we should 4630 // create the declaration. 4631 DeclContext *DC; 4632 4633 // FIXME: handle local classes 4634 4635 // Recover from invalid scope qualifiers as if they just weren't there. 4636 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 4637 ForRedeclaration); 4638 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 4639 // FIXME: RequireCompleteDeclContext 4640 DC = computeDeclContext(ScopeQual); 4641 4642 // FIXME: handle dependent contexts 4643 if (!DC) return DeclPtrTy(); 4644 4645 LookupQualifiedName(Previous, DC); 4646 4647 // If searching in that context implicitly found a declaration in 4648 // a different context, treat it like it wasn't found at all. 4649 // TODO: better diagnostics for this case. Suggesting the right 4650 // qualified scope would be nice... 4651 // FIXME: getRepresentativeDecl() is not right here at all 4652 if (Previous.empty() || 4653 !Previous.getRepresentativeDecl()->getDeclContext()->Equals(DC)) { 4654 D.setInvalidType(); 4655 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 4656 return DeclPtrTy(); 4657 } 4658 4659 // C++ [class.friend]p1: A friend of a class is a function or 4660 // class that is not a member of the class . . . 4661 if (DC->Equals(CurContext)) 4662 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4663 4664 // Otherwise walk out to the nearest namespace scope looking for matches. 4665 } else { 4666 // TODO: handle local class contexts. 4667 4668 DC = CurContext; 4669 while (true) { 4670 // Skip class contexts. If someone can cite chapter and verse 4671 // for this behavior, that would be nice --- it's what GCC and 4672 // EDG do, and it seems like a reasonable intent, but the spec 4673 // really only says that checks for unqualified existing 4674 // declarations should stop at the nearest enclosing namespace, 4675 // not that they should only consider the nearest enclosing 4676 // namespace. 4677 while (DC->isRecord()) 4678 DC = DC->getParent(); 4679 4680 LookupQualifiedName(Previous, DC); 4681 4682 // TODO: decide what we think about using declarations. 4683 if (!Previous.empty()) 4684 break; 4685 4686 if (DC->isFileContext()) break; 4687 DC = DC->getParent(); 4688 } 4689 4690 // C++ [class.friend]p1: A friend of a class is a function or 4691 // class that is not a member of the class . . . 4692 // C++0x changes this for both friend types and functions. 4693 // Most C++ 98 compilers do seem to give an error here, so 4694 // we do, too. 4695 if (!Previous.empty() && DC->Equals(CurContext) 4696 && !getLangOptions().CPlusPlus0x) 4697 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 4698 } 4699 4700 if (DC->isFileContext()) { 4701 // This implies that it has to be an operator or function. 4702 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 4703 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 4704 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 4705 Diag(Loc, diag::err_introducing_special_friend) << 4706 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 4707 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 4708 return DeclPtrTy(); 4709 } 4710 } 4711 4712 bool Redeclaration = false; 4713 NamedDecl *ND = ActOnFunctionDeclarator(S, D, DC, T, DInfo, Previous, 4714 move(TemplateParams), 4715 IsDefinition, 4716 Redeclaration); 4717 if (!ND) return DeclPtrTy(); 4718 4719 assert(ND->getDeclContext() == DC); 4720 assert(ND->getLexicalDeclContext() == CurContext); 4721 4722 // Add the function declaration to the appropriate lookup tables, 4723 // adjusting the redeclarations list as necessary. We don't 4724 // want to do this yet if the friending class is dependent. 4725 // 4726 // Also update the scope-based lookup if the target context's 4727 // lookup context is in lexical scope. 4728 if (!CurContext->isDependentContext()) { 4729 DC = DC->getLookupContext(); 4730 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 4731 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4732 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 4733 } 4734 4735 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 4736 D.getIdentifierLoc(), ND, 4737 DS.getFriendSpecLoc()); 4738 FrD->setAccess(AS_public); 4739 CurContext->addDecl(FrD); 4740 4741 return DeclPtrTy::make(ND); 4742} 4743 4744void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 4745 AdjustDeclIfTemplate(dcl); 4746 4747 Decl *Dcl = dcl.getAs<Decl>(); 4748 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 4749 if (!Fn) { 4750 Diag(DelLoc, diag::err_deleted_non_function); 4751 return; 4752 } 4753 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 4754 Diag(DelLoc, diag::err_deleted_decl_not_first); 4755 Diag(Prev->getLocation(), diag::note_previous_declaration); 4756 // If the declaration wasn't the first, we delete the function anyway for 4757 // recovery. 4758 } 4759 Fn->setDeleted(); 4760} 4761 4762static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 4763 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 4764 ++CI) { 4765 Stmt *SubStmt = *CI; 4766 if (!SubStmt) 4767 continue; 4768 if (isa<ReturnStmt>(SubStmt)) 4769 Self.Diag(SubStmt->getSourceRange().getBegin(), 4770 diag::err_return_in_constructor_handler); 4771 if (!isa<Expr>(SubStmt)) 4772 SearchForReturnInStmt(Self, SubStmt); 4773 } 4774} 4775 4776void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 4777 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 4778 CXXCatchStmt *Handler = TryBlock->getHandler(I); 4779 SearchForReturnInStmt(*this, Handler); 4780 } 4781} 4782 4783bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 4784 const CXXMethodDecl *Old) { 4785 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 4786 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 4787 4788 QualType CNewTy = Context.getCanonicalType(NewTy); 4789 QualType COldTy = Context.getCanonicalType(OldTy); 4790 4791 if (CNewTy == COldTy && 4792 CNewTy.getLocalCVRQualifiers() == COldTy.getLocalCVRQualifiers()) 4793 return false; 4794 4795 // Check if the return types are covariant 4796 QualType NewClassTy, OldClassTy; 4797 4798 /// Both types must be pointers or references to classes. 4799 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 4800 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 4801 NewClassTy = NewPT->getPointeeType(); 4802 OldClassTy = OldPT->getPointeeType(); 4803 } 4804 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 4805 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 4806 NewClassTy = NewRT->getPointeeType(); 4807 OldClassTy = OldRT->getPointeeType(); 4808 } 4809 } 4810 4811 // The return types aren't either both pointers or references to a class type. 4812 if (NewClassTy.isNull()) { 4813 Diag(New->getLocation(), 4814 diag::err_different_return_type_for_overriding_virtual_function) 4815 << New->getDeclName() << NewTy << OldTy; 4816 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4817 4818 return true; 4819 } 4820 4821 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 4822 // Check if the new class derives from the old class. 4823 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 4824 Diag(New->getLocation(), 4825 diag::err_covariant_return_not_derived) 4826 << New->getDeclName() << NewTy << OldTy; 4827 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4828 return true; 4829 } 4830 4831 // Check if we the conversion from derived to base is valid. 4832 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 4833 diag::err_covariant_return_inaccessible_base, 4834 diag::err_covariant_return_ambiguous_derived_to_base_conv, 4835 // FIXME: Should this point to the return type? 4836 New->getLocation(), SourceRange(), New->getDeclName())) { 4837 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4838 return true; 4839 } 4840 } 4841 4842 // The qualifiers of the return types must be the same. 4843 if (CNewTy.getLocalCVRQualifiers() != COldTy.getLocalCVRQualifiers()) { 4844 Diag(New->getLocation(), 4845 diag::err_covariant_return_type_different_qualifications) 4846 << New->getDeclName() << NewTy << OldTy; 4847 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4848 return true; 4849 }; 4850 4851 4852 // The new class type must have the same or less qualifiers as the old type. 4853 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 4854 Diag(New->getLocation(), 4855 diag::err_covariant_return_type_class_type_more_qualified) 4856 << New->getDeclName() << NewTy << OldTy; 4857 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4858 return true; 4859 }; 4860 4861 return false; 4862} 4863 4864bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 4865 const CXXMethodDecl *Old) 4866{ 4867 if (Old->hasAttr<FinalAttr>()) { 4868 Diag(New->getLocation(), diag::err_final_function_overridden) 4869 << New->getDeclName(); 4870 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 4871 return true; 4872 } 4873 4874 return false; 4875} 4876 4877/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 4878/// initializer for the declaration 'Dcl'. 4879/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 4880/// static data member of class X, names should be looked up in the scope of 4881/// class X. 4882void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4883 AdjustDeclIfTemplate(Dcl); 4884 4885 Decl *D = Dcl.getAs<Decl>(); 4886 // If there is no declaration, there was an error parsing it. 4887 if (D == 0) 4888 return; 4889 4890 // Check whether it is a declaration with a nested name specifier like 4891 // int foo::bar; 4892 if (!D->isOutOfLine()) 4893 return; 4894 4895 // C++ [basic.lookup.unqual]p13 4896 // 4897 // A name used in the definition of a static data member of class X 4898 // (after the qualified-id of the static member) is looked up as if the name 4899 // was used in a member function of X. 4900 4901 // Change current context into the context of the initializing declaration. 4902 EnterDeclaratorContext(S, D->getDeclContext()); 4903} 4904 4905/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 4906/// initializer for the declaration 'Dcl'. 4907void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 4908 AdjustDeclIfTemplate(Dcl); 4909 4910 Decl *D = Dcl.getAs<Decl>(); 4911 // If there is no declaration, there was an error parsing it. 4912 if (D == 0) 4913 return; 4914 4915 // Check whether it is a declaration with a nested name specifier like 4916 // int foo::bar; 4917 if (!D->isOutOfLine()) 4918 return; 4919 4920 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 4921 ExitDeclaratorContext(S); 4922} 4923 4924/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 4925/// C++ if/switch/while/for statement. 4926/// e.g: "if (int x = f()) {...}" 4927Action::DeclResult 4928Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 4929 // C++ 6.4p2: 4930 // The declarator shall not specify a function or an array. 4931 // The type-specifier-seq shall not contain typedef and shall not declare a 4932 // new class or enumeration. 4933 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 4934 "Parser allowed 'typedef' as storage class of condition decl."); 4935 4936 DeclaratorInfo *DInfo = 0; 4937 TagDecl *OwnedTag = 0; 4938 QualType Ty = GetTypeForDeclarator(D, S, &DInfo, &OwnedTag); 4939 4940 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 4941 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 4942 // would be created and CXXConditionDeclExpr wants a VarDecl. 4943 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 4944 << D.getSourceRange(); 4945 return DeclResult(); 4946 } else if (OwnedTag && OwnedTag->isDefinition()) { 4947 // The type-specifier-seq shall not declare a new class or enumeration. 4948 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 4949 } 4950 4951 DeclPtrTy Dcl = ActOnDeclarator(S, D); 4952 if (!Dcl) 4953 return DeclResult(); 4954 4955 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>()); 4956 VD->setDeclaredInCondition(true); 4957 return Dcl; 4958} 4959