SemaDeclCXX.cpp revision e761230ae3751b525cadd8066c74ec278ee4ef57
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 "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/ASTMutationListener.h" 22#include "clang/AST/CharUnits.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclVisitor.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/AST/StmtVisitor.h" 28#include "clang/AST/TypeLoc.h" 29#include "clang/AST/TypeOrdering.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Lex/Preprocessor.h" 34#include "llvm/ADT/DenseSet.h" 35#include "llvm/ADT/STLExtras.h" 36#include <map> 37#include <set> 38 39using namespace clang; 40 41//===----------------------------------------------------------------------===// 42// CheckDefaultArgumentVisitor 43//===----------------------------------------------------------------------===// 44 45namespace { 46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 47 /// the default argument of a parameter to determine whether it 48 /// contains any ill-formed subexpressions. For example, this will 49 /// diagnose the use of local variables or parameters within the 50 /// default argument expression. 51 class CheckDefaultArgumentVisitor 52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 53 Expr *DefaultArg; 54 Sema *S; 55 56 public: 57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 58 : DefaultArg(defarg), S(s) {} 59 60 bool VisitExpr(Expr *Node); 61 bool VisitDeclRefExpr(DeclRefExpr *DRE); 62 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 63 }; 64 65 /// VisitExpr - Visit all of the children of this expression. 66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 67 bool IsInvalid = false; 68 for (Stmt::child_range I = Node->children(); I; ++I) 69 IsInvalid |= Visit(*I); 70 return IsInvalid; 71 } 72 73 /// VisitDeclRefExpr - Visit a reference to a declaration, to 74 /// determine whether this declaration can be used in the default 75 /// argument expression. 76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 77 NamedDecl *Decl = DRE->getDecl(); 78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 79 // C++ [dcl.fct.default]p9 80 // Default arguments are evaluated each time the function is 81 // called. The order of evaluation of function arguments is 82 // unspecified. Consequently, parameters of a function shall not 83 // be used in default argument expressions, even if they are not 84 // evaluated. Parameters of a function declared before a default 85 // argument expression are in scope and can hide namespace and 86 // class member names. 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_param) 89 << Param->getDeclName() << DefaultArg->getSourceRange(); 90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 91 // C++ [dcl.fct.default]p7 92 // Local variables shall not be used in default argument 93 // expressions. 94 if (VDecl->isLocalVarDecl()) 95 return S->Diag(DRE->getSourceRange().getBegin(), 96 diag::err_param_default_argument_references_local) 97 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 98 } 99 100 return false; 101 } 102 103 /// VisitCXXThisExpr - Visit a C++ "this" expression. 104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 105 // C++ [dcl.fct.default]p8: 106 // The keyword this shall not be used in a default argument of a 107 // member function. 108 return S->Diag(ThisE->getSourceRange().getBegin(), 109 diag::err_param_default_argument_references_this) 110 << ThisE->getSourceRange(); 111 } 112} 113 114void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 115 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 116 // If we have an MSAny or unknown spec already, don't bother. 117 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 118 return; 119 120 const FunctionProtoType *Proto 121 = Method->getType()->getAs<FunctionProtoType>(); 122 123 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 124 125 // If this function can throw any exceptions, make a note of that. 126 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 127 ClearExceptions(); 128 ComputedEST = EST; 129 return; 130 } 131 132 // FIXME: If the call to this decl is using any of its default arguments, we 133 // need to search them for potentially-throwing calls. 134 135 // If this function has a basic noexcept, it doesn't affect the outcome. 136 if (EST == EST_BasicNoexcept) 137 return; 138 139 // If we have a throw-all spec at this point, ignore the function. 140 if (ComputedEST == EST_None) 141 return; 142 143 // If we're still at noexcept(true) and there's a nothrow() callee, 144 // change to that specification. 145 if (EST == EST_DynamicNone) { 146 if (ComputedEST == EST_BasicNoexcept) 147 ComputedEST = EST_DynamicNone; 148 return; 149 } 150 151 // Check out noexcept specs. 152 if (EST == EST_ComputedNoexcept) { 153 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 154 assert(NR != FunctionProtoType::NR_NoNoexcept && 155 "Must have noexcept result for EST_ComputedNoexcept."); 156 assert(NR != FunctionProtoType::NR_Dependent && 157 "Should not generate implicit declarations for dependent cases, " 158 "and don't know how to handle them anyway."); 159 160 // noexcept(false) -> no spec on the new function 161 if (NR == FunctionProtoType::NR_Throw) { 162 ClearExceptions(); 163 ComputedEST = EST_None; 164 } 165 // noexcept(true) won't change anything either. 166 return; 167 } 168 169 assert(EST == EST_Dynamic && "EST case not considered earlier."); 170 assert(ComputedEST != EST_None && 171 "Shouldn't collect exceptions when throw-all is guaranteed."); 172 ComputedEST = EST_Dynamic; 173 // Record the exceptions in this function's exception specification. 174 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 175 EEnd = Proto->exception_end(); 176 E != EEnd; ++E) 177 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 178 Exceptions.push_back(*E); 179} 180 181void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 182 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 183 return; 184 185 // FIXME: 186 // 187 // C++0x [except.spec]p14: 188 // [An] implicit exception-specification specifies the type-id T if and 189 // only if T is allowed by the exception-specification of a function directly 190 // invoked by f's implicit definition; f shall allow all exceptions if any 191 // function it directly invokes allows all exceptions, and f shall allow no 192 // exceptions if every function it directly invokes allows no exceptions. 193 // 194 // Note in particular that if an implicit exception-specification is generated 195 // for a function containing a throw-expression, that specification can still 196 // be noexcept(true). 197 // 198 // Note also that 'directly invoked' is not defined in the standard, and there 199 // is no indication that we should only consider potentially-evaluated calls. 200 // 201 // Ultimately we should implement the intent of the standard: the exception 202 // specification should be the set of exceptions which can be thrown by the 203 // implicit definition. For now, we assume that any non-nothrow expression can 204 // throw any exception. 205 206 if (E->CanThrow(*Context)) 207 ComputedEST = EST_None; 208} 209 210bool 211Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 212 SourceLocation EqualLoc) { 213 if (RequireCompleteType(Param->getLocation(), Param->getType(), 214 diag::err_typecheck_decl_incomplete_type)) { 215 Param->setInvalidDecl(); 216 return true; 217 } 218 219 // C++ [dcl.fct.default]p5 220 // A default argument expression is implicitly converted (clause 221 // 4) to the parameter type. The default argument expression has 222 // the same semantic constraints as the initializer expression in 223 // a declaration of a variable of the parameter type, using the 224 // copy-initialization semantics (8.5). 225 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 226 Param); 227 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 228 EqualLoc); 229 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 230 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 231 MultiExprArg(*this, &Arg, 1)); 232 if (Result.isInvalid()) 233 return true; 234 Arg = Result.takeAs<Expr>(); 235 236 CheckImplicitConversions(Arg, EqualLoc); 237 Arg = MaybeCreateExprWithCleanups(Arg); 238 239 // Okay: add the default argument to the parameter 240 Param->setDefaultArg(Arg); 241 242 // We have already instantiated this parameter; provide each of the 243 // instantiations with the uninstantiated default argument. 244 UnparsedDefaultArgInstantiationsMap::iterator InstPos 245 = UnparsedDefaultArgInstantiations.find(Param); 246 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 247 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 248 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 249 250 // We're done tracking this parameter's instantiations. 251 UnparsedDefaultArgInstantiations.erase(InstPos); 252 } 253 254 return false; 255} 256 257/// ActOnParamDefaultArgument - Check whether the default argument 258/// provided for a function parameter is well-formed. If so, attach it 259/// to the parameter declaration. 260void 261Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 262 Expr *DefaultArg) { 263 if (!param || !DefaultArg) 264 return; 265 266 ParmVarDecl *Param = cast<ParmVarDecl>(param); 267 UnparsedDefaultArgLocs.erase(Param); 268 269 // Default arguments are only permitted in C++ 270 if (!getLangOptions().CPlusPlus) { 271 Diag(EqualLoc, diag::err_param_default_argument) 272 << DefaultArg->getSourceRange(); 273 Param->setInvalidDecl(); 274 return; 275 } 276 277 // Check for unexpanded parameter packs. 278 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 279 Param->setInvalidDecl(); 280 return; 281 } 282 283 // Check that the default argument is well-formed 284 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 285 if (DefaultArgChecker.Visit(DefaultArg)) { 286 Param->setInvalidDecl(); 287 return; 288 } 289 290 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 291} 292 293/// ActOnParamUnparsedDefaultArgument - We've seen a default 294/// argument for a function parameter, but we can't parse it yet 295/// because we're inside a class definition. Note that this default 296/// argument will be parsed later. 297void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 298 SourceLocation EqualLoc, 299 SourceLocation ArgLoc) { 300 if (!param) 301 return; 302 303 ParmVarDecl *Param = cast<ParmVarDecl>(param); 304 if (Param) 305 Param->setUnparsedDefaultArg(); 306 307 UnparsedDefaultArgLocs[Param] = ArgLoc; 308} 309 310/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 311/// the default argument for the parameter param failed. 312void Sema::ActOnParamDefaultArgumentError(Decl *param) { 313 if (!param) 314 return; 315 316 ParmVarDecl *Param = cast<ParmVarDecl>(param); 317 318 Param->setInvalidDecl(); 319 320 UnparsedDefaultArgLocs.erase(Param); 321} 322 323/// CheckExtraCXXDefaultArguments - Check for any extra default 324/// arguments in the declarator, which is not a function declaration 325/// or definition and therefore is not permitted to have default 326/// arguments. This routine should be invoked for every declarator 327/// that is not a function declaration or definition. 328void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 329 // C++ [dcl.fct.default]p3 330 // A default argument expression shall be specified only in the 331 // parameter-declaration-clause of a function declaration or in a 332 // template-parameter (14.1). It shall not be specified for a 333 // parameter pack. If it is specified in a 334 // parameter-declaration-clause, it shall not occur within a 335 // declarator or abstract-declarator of a parameter-declaration. 336 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 337 DeclaratorChunk &chunk = D.getTypeObject(i); 338 if (chunk.Kind == DeclaratorChunk::Function) { 339 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 340 ParmVarDecl *Param = 341 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 342 if (Param->hasUnparsedDefaultArg()) { 343 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 344 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 345 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 346 delete Toks; 347 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 348 } else if (Param->getDefaultArg()) { 349 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 350 << Param->getDefaultArg()->getSourceRange(); 351 Param->setDefaultArg(0); 352 } 353 } 354 } 355 } 356} 357 358// MergeCXXFunctionDecl - Merge two declarations of the same C++ 359// function, once we already know that they have the same 360// type. Subroutine of MergeFunctionDecl. Returns true if there was an 361// error, false otherwise. 362bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 363 bool Invalid = false; 364 365 // C++ [dcl.fct.default]p4: 366 // For non-template functions, default arguments can be added in 367 // later declarations of a function in the same 368 // scope. Declarations in different scopes have completely 369 // distinct sets of default arguments. That is, declarations in 370 // inner scopes do not acquire default arguments from 371 // declarations in outer scopes, and vice versa. In a given 372 // function declaration, all parameters subsequent to a 373 // parameter with a default argument shall have default 374 // arguments supplied in this or previous declarations. A 375 // default argument shall not be redefined by a later 376 // declaration (not even to the same value). 377 // 378 // C++ [dcl.fct.default]p6: 379 // Except for member functions of class templates, the default arguments 380 // in a member function definition that appears outside of the class 381 // definition are added to the set of default arguments provided by the 382 // member function declaration in the class definition. 383 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 384 ParmVarDecl *OldParam = Old->getParamDecl(p); 385 ParmVarDecl *NewParam = New->getParamDecl(p); 386 387 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 388 389 unsigned DiagDefaultParamID = 390 diag::err_param_default_argument_redefinition; 391 392 // MSVC accepts that default parameters be redefined for member functions 393 // of template class. The new default parameter's value is ignored. 394 Invalid = true; 395 if (getLangOptions().Microsoft) { 396 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 397 if (MD && MD->getParent()->getDescribedClassTemplate()) { 398 // Merge the old default argument into the new parameter. 399 NewParam->setHasInheritedDefaultArg(); 400 if (OldParam->hasUninstantiatedDefaultArg()) 401 NewParam->setUninstantiatedDefaultArg( 402 OldParam->getUninstantiatedDefaultArg()); 403 else 404 NewParam->setDefaultArg(OldParam->getInit()); 405 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 406 Invalid = false; 407 } 408 } 409 410 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 411 // hint here. Alternatively, we could walk the type-source information 412 // for NewParam to find the last source location in the type... but it 413 // isn't worth the effort right now. This is the kind of test case that 414 // is hard to get right: 415 // int f(int); 416 // void g(int (*fp)(int) = f); 417 // void g(int (*fp)(int) = &f); 418 Diag(NewParam->getLocation(), DiagDefaultParamID) 419 << NewParam->getDefaultArgRange(); 420 421 // Look for the function declaration where the default argument was 422 // actually written, which may be a declaration prior to Old. 423 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 424 Older; Older = Older->getPreviousDeclaration()) { 425 if (!Older->getParamDecl(p)->hasDefaultArg()) 426 break; 427 428 OldParam = Older->getParamDecl(p); 429 } 430 431 Diag(OldParam->getLocation(), diag::note_previous_definition) 432 << OldParam->getDefaultArgRange(); 433 } else if (OldParam->hasDefaultArg()) { 434 // Merge the old default argument into the new parameter. 435 // It's important to use getInit() here; getDefaultArg() 436 // strips off any top-level ExprWithCleanups. 437 NewParam->setHasInheritedDefaultArg(); 438 if (OldParam->hasUninstantiatedDefaultArg()) 439 NewParam->setUninstantiatedDefaultArg( 440 OldParam->getUninstantiatedDefaultArg()); 441 else 442 NewParam->setDefaultArg(OldParam->getInit()); 443 } else if (NewParam->hasDefaultArg()) { 444 if (New->getDescribedFunctionTemplate()) { 445 // Paragraph 4, quoted above, only applies to non-template functions. 446 Diag(NewParam->getLocation(), 447 diag::err_param_default_argument_template_redecl) 448 << NewParam->getDefaultArgRange(); 449 Diag(Old->getLocation(), diag::note_template_prev_declaration) 450 << false; 451 } else if (New->getTemplateSpecializationKind() 452 != TSK_ImplicitInstantiation && 453 New->getTemplateSpecializationKind() != TSK_Undeclared) { 454 // C++ [temp.expr.spec]p21: 455 // Default function arguments shall not be specified in a declaration 456 // or a definition for one of the following explicit specializations: 457 // - the explicit specialization of a function template; 458 // - the explicit specialization of a member function template; 459 // - the explicit specialization of a member function of a class 460 // template where the class template specialization to which the 461 // member function specialization belongs is implicitly 462 // instantiated. 463 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 464 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 465 << New->getDeclName() 466 << NewParam->getDefaultArgRange(); 467 } else if (New->getDeclContext()->isDependentContext()) { 468 // C++ [dcl.fct.default]p6 (DR217): 469 // Default arguments for a member function of a class template shall 470 // be specified on the initial declaration of the member function 471 // within the class template. 472 // 473 // Reading the tea leaves a bit in DR217 and its reference to DR205 474 // leads me to the conclusion that one cannot add default function 475 // arguments for an out-of-line definition of a member function of a 476 // dependent type. 477 int WhichKind = 2; 478 if (CXXRecordDecl *Record 479 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 480 if (Record->getDescribedClassTemplate()) 481 WhichKind = 0; 482 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 483 WhichKind = 1; 484 else 485 WhichKind = 2; 486 } 487 488 Diag(NewParam->getLocation(), 489 diag::err_param_default_argument_member_template_redecl) 490 << WhichKind 491 << NewParam->getDefaultArgRange(); 492 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 493 CXXSpecialMember NewSM = getSpecialMember(Ctor), 494 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 495 if (NewSM != OldSM) { 496 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 497 << NewParam->getDefaultArgRange() << NewSM; 498 Diag(Old->getLocation(), diag::note_previous_declaration_special) 499 << OldSM; 500 } 501 } 502 } 503 } 504 505 if (CheckEquivalentExceptionSpec(Old, New)) 506 Invalid = true; 507 508 return Invalid; 509} 510 511/// \brief Merge the exception specifications of two variable declarations. 512/// 513/// This is called when there's a redeclaration of a VarDecl. The function 514/// checks if the redeclaration might have an exception specification and 515/// validates compatibility and merges the specs if necessary. 516void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 517 // Shortcut if exceptions are disabled. 518 if (!getLangOptions().CXXExceptions) 519 return; 520 521 assert(Context.hasSameType(New->getType(), Old->getType()) && 522 "Should only be called if types are otherwise the same."); 523 524 QualType NewType = New->getType(); 525 QualType OldType = Old->getType(); 526 527 // We're only interested in pointers and references to functions, as well 528 // as pointers to member functions. 529 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 530 NewType = R->getPointeeType(); 531 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 532 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 533 NewType = P->getPointeeType(); 534 OldType = OldType->getAs<PointerType>()->getPointeeType(); 535 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 536 NewType = M->getPointeeType(); 537 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 538 } 539 540 if (!NewType->isFunctionProtoType()) 541 return; 542 543 // There's lots of special cases for functions. For function pointers, system 544 // libraries are hopefully not as broken so that we don't need these 545 // workarounds. 546 if (CheckEquivalentExceptionSpec( 547 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 548 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 549 New->setInvalidDecl(); 550 } 551} 552 553/// CheckCXXDefaultArguments - Verify that the default arguments for a 554/// function declaration are well-formed according to C++ 555/// [dcl.fct.default]. 556void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 557 unsigned NumParams = FD->getNumParams(); 558 unsigned p; 559 560 // Find first parameter with a default argument 561 for (p = 0; p < NumParams; ++p) { 562 ParmVarDecl *Param = FD->getParamDecl(p); 563 if (Param->hasDefaultArg()) 564 break; 565 } 566 567 // C++ [dcl.fct.default]p4: 568 // In a given function declaration, all parameters 569 // subsequent to a parameter with a default argument shall 570 // have default arguments supplied in this or previous 571 // declarations. A default argument shall not be redefined 572 // by a later declaration (not even to the same value). 573 unsigned LastMissingDefaultArg = 0; 574 for (; p < NumParams; ++p) { 575 ParmVarDecl *Param = FD->getParamDecl(p); 576 if (!Param->hasDefaultArg()) { 577 if (Param->isInvalidDecl()) 578 /* We already complained about this parameter. */; 579 else if (Param->getIdentifier()) 580 Diag(Param->getLocation(), 581 diag::err_param_default_argument_missing_name) 582 << Param->getIdentifier(); 583 else 584 Diag(Param->getLocation(), 585 diag::err_param_default_argument_missing); 586 587 LastMissingDefaultArg = p; 588 } 589 } 590 591 if (LastMissingDefaultArg > 0) { 592 // Some default arguments were missing. Clear out all of the 593 // default arguments up to (and including) the last missing 594 // default argument, so that we leave the function parameters 595 // in a semantically valid state. 596 for (p = 0; p <= LastMissingDefaultArg; ++p) { 597 ParmVarDecl *Param = FD->getParamDecl(p); 598 if (Param->hasDefaultArg()) { 599 Param->setDefaultArg(0); 600 } 601 } 602 } 603} 604 605/// isCurrentClassName - Determine whether the identifier II is the 606/// name of the class type currently being defined. In the case of 607/// nested classes, this will only return true if II is the name of 608/// the innermost class. 609bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 610 const CXXScopeSpec *SS) { 611 assert(getLangOptions().CPlusPlus && "No class names in C!"); 612 613 CXXRecordDecl *CurDecl; 614 if (SS && SS->isSet() && !SS->isInvalid()) { 615 DeclContext *DC = computeDeclContext(*SS, true); 616 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 617 } else 618 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 619 620 if (CurDecl && CurDecl->getIdentifier()) 621 return &II == CurDecl->getIdentifier(); 622 else 623 return false; 624} 625 626/// \brief Check the validity of a C++ base class specifier. 627/// 628/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 629/// and returns NULL otherwise. 630CXXBaseSpecifier * 631Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 632 SourceRange SpecifierRange, 633 bool Virtual, AccessSpecifier Access, 634 TypeSourceInfo *TInfo, 635 SourceLocation EllipsisLoc) { 636 QualType BaseType = TInfo->getType(); 637 638 // C++ [class.union]p1: 639 // A union shall not have base classes. 640 if (Class->isUnion()) { 641 Diag(Class->getLocation(), diag::err_base_clause_on_union) 642 << SpecifierRange; 643 return 0; 644 } 645 646 if (EllipsisLoc.isValid() && 647 !TInfo->getType()->containsUnexpandedParameterPack()) { 648 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 649 << TInfo->getTypeLoc().getSourceRange(); 650 EllipsisLoc = SourceLocation(); 651 } 652 653 if (BaseType->isDependentType()) 654 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 655 Class->getTagKind() == TTK_Class, 656 Access, TInfo, EllipsisLoc); 657 658 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 659 660 // Base specifiers must be record types. 661 if (!BaseType->isRecordType()) { 662 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 663 return 0; 664 } 665 666 // C++ [class.union]p1: 667 // A union shall not be used as a base class. 668 if (BaseType->isUnionType()) { 669 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 670 return 0; 671 } 672 673 // C++ [class.derived]p2: 674 // The class-name in a base-specifier shall not be an incompletely 675 // defined class. 676 if (RequireCompleteType(BaseLoc, BaseType, 677 PDiag(diag::err_incomplete_base_class) 678 << SpecifierRange)) { 679 Class->setInvalidDecl(); 680 return 0; 681 } 682 683 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 684 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 685 assert(BaseDecl && "Record type has no declaration"); 686 BaseDecl = BaseDecl->getDefinition(); 687 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 688 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 689 assert(CXXBaseDecl && "Base type is not a C++ type"); 690 691 // C++ [class]p3: 692 // If a class is marked final and it appears as a base-type-specifier in 693 // base-clause, the program is ill-formed. 694 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 695 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 696 << CXXBaseDecl->getDeclName(); 697 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 698 << CXXBaseDecl->getDeclName(); 699 return 0; 700 } 701 702 if (BaseDecl->isInvalidDecl()) 703 Class->setInvalidDecl(); 704 705 // Create the base specifier. 706 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 707 Class->getTagKind() == TTK_Class, 708 Access, TInfo, EllipsisLoc); 709} 710 711/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 712/// one entry in the base class list of a class specifier, for 713/// example: 714/// class foo : public bar, virtual private baz { 715/// 'public bar' and 'virtual private baz' are each base-specifiers. 716BaseResult 717Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 718 bool Virtual, AccessSpecifier Access, 719 ParsedType basetype, SourceLocation BaseLoc, 720 SourceLocation EllipsisLoc) { 721 if (!classdecl) 722 return true; 723 724 AdjustDeclIfTemplate(classdecl); 725 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 726 if (!Class) 727 return true; 728 729 TypeSourceInfo *TInfo = 0; 730 GetTypeFromParser(basetype, &TInfo); 731 732 if (EllipsisLoc.isInvalid() && 733 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 734 UPPC_BaseType)) 735 return true; 736 737 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 738 Virtual, Access, TInfo, 739 EllipsisLoc)) 740 return BaseSpec; 741 742 return true; 743} 744 745/// \brief Performs the actual work of attaching the given base class 746/// specifiers to a C++ class. 747bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 748 unsigned NumBases) { 749 if (NumBases == 0) 750 return false; 751 752 // Used to keep track of which base types we have already seen, so 753 // that we can properly diagnose redundant direct base types. Note 754 // that the key is always the unqualified canonical type of the base 755 // class. 756 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 757 758 // Copy non-redundant base specifiers into permanent storage. 759 unsigned NumGoodBases = 0; 760 bool Invalid = false; 761 for (unsigned idx = 0; idx < NumBases; ++idx) { 762 QualType NewBaseType 763 = Context.getCanonicalType(Bases[idx]->getType()); 764 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 765 if (KnownBaseTypes[NewBaseType]) { 766 // C++ [class.mi]p3: 767 // A class shall not be specified as a direct base class of a 768 // derived class more than once. 769 Diag(Bases[idx]->getSourceRange().getBegin(), 770 diag::err_duplicate_base_class) 771 << KnownBaseTypes[NewBaseType]->getType() 772 << Bases[idx]->getSourceRange(); 773 774 // Delete the duplicate base class specifier; we're going to 775 // overwrite its pointer later. 776 Context.Deallocate(Bases[idx]); 777 778 Invalid = true; 779 } else { 780 // Okay, add this new base class. 781 KnownBaseTypes[NewBaseType] = Bases[idx]; 782 Bases[NumGoodBases++] = Bases[idx]; 783 } 784 } 785 786 // Attach the remaining base class specifiers to the derived class. 787 Class->setBases(Bases, NumGoodBases); 788 789 // Delete the remaining (good) base class specifiers, since their 790 // data has been copied into the CXXRecordDecl. 791 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 792 Context.Deallocate(Bases[idx]); 793 794 return Invalid; 795} 796 797/// ActOnBaseSpecifiers - Attach the given base specifiers to the 798/// class, after checking whether there are any duplicate base 799/// classes. 800void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 801 unsigned NumBases) { 802 if (!ClassDecl || !Bases || !NumBases) 803 return; 804 805 AdjustDeclIfTemplate(ClassDecl); 806 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 807 (CXXBaseSpecifier**)(Bases), NumBases); 808} 809 810static CXXRecordDecl *GetClassForType(QualType T) { 811 if (const RecordType *RT = T->getAs<RecordType>()) 812 return cast<CXXRecordDecl>(RT->getDecl()); 813 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 814 return ICT->getDecl(); 815 else 816 return 0; 817} 818 819/// \brief Determine whether the type \p Derived is a C++ class that is 820/// derived from the type \p Base. 821bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 822 if (!getLangOptions().CPlusPlus) 823 return false; 824 825 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 826 if (!DerivedRD) 827 return false; 828 829 CXXRecordDecl *BaseRD = GetClassForType(Base); 830 if (!BaseRD) 831 return false; 832 833 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 834 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 835} 836 837/// \brief Determine whether the type \p Derived is a C++ class that is 838/// derived from the type \p Base. 839bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 840 if (!getLangOptions().CPlusPlus) 841 return false; 842 843 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 844 if (!DerivedRD) 845 return false; 846 847 CXXRecordDecl *BaseRD = GetClassForType(Base); 848 if (!BaseRD) 849 return false; 850 851 return DerivedRD->isDerivedFrom(BaseRD, Paths); 852} 853 854void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 855 CXXCastPath &BasePathArray) { 856 assert(BasePathArray.empty() && "Base path array must be empty!"); 857 assert(Paths.isRecordingPaths() && "Must record paths!"); 858 859 const CXXBasePath &Path = Paths.front(); 860 861 // We first go backward and check if we have a virtual base. 862 // FIXME: It would be better if CXXBasePath had the base specifier for 863 // the nearest virtual base. 864 unsigned Start = 0; 865 for (unsigned I = Path.size(); I != 0; --I) { 866 if (Path[I - 1].Base->isVirtual()) { 867 Start = I - 1; 868 break; 869 } 870 } 871 872 // Now add all bases. 873 for (unsigned I = Start, E = Path.size(); I != E; ++I) 874 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 875} 876 877/// \brief Determine whether the given base path includes a virtual 878/// base class. 879bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 880 for (CXXCastPath::const_iterator B = BasePath.begin(), 881 BEnd = BasePath.end(); 882 B != BEnd; ++B) 883 if ((*B)->isVirtual()) 884 return true; 885 886 return false; 887} 888 889/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 890/// conversion (where Derived and Base are class types) is 891/// well-formed, meaning that the conversion is unambiguous (and 892/// that all of the base classes are accessible). Returns true 893/// and emits a diagnostic if the code is ill-formed, returns false 894/// otherwise. Loc is the location where this routine should point to 895/// if there is an error, and Range is the source range to highlight 896/// if there is an error. 897bool 898Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 899 unsigned InaccessibleBaseID, 900 unsigned AmbigiousBaseConvID, 901 SourceLocation Loc, SourceRange Range, 902 DeclarationName Name, 903 CXXCastPath *BasePath) { 904 // First, determine whether the path from Derived to Base is 905 // ambiguous. This is slightly more expensive than checking whether 906 // the Derived to Base conversion exists, because here we need to 907 // explore multiple paths to determine if there is an ambiguity. 908 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 909 /*DetectVirtual=*/false); 910 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 911 assert(DerivationOkay && 912 "Can only be used with a derived-to-base conversion"); 913 (void)DerivationOkay; 914 915 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 916 if (InaccessibleBaseID) { 917 // Check that the base class can be accessed. 918 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 919 InaccessibleBaseID)) { 920 case AR_inaccessible: 921 return true; 922 case AR_accessible: 923 case AR_dependent: 924 case AR_delayed: 925 break; 926 } 927 } 928 929 // Build a base path if necessary. 930 if (BasePath) 931 BuildBasePathArray(Paths, *BasePath); 932 return false; 933 } 934 935 // We know that the derived-to-base conversion is ambiguous, and 936 // we're going to produce a diagnostic. Perform the derived-to-base 937 // search just one more time to compute all of the possible paths so 938 // that we can print them out. This is more expensive than any of 939 // the previous derived-to-base checks we've done, but at this point 940 // performance isn't as much of an issue. 941 Paths.clear(); 942 Paths.setRecordingPaths(true); 943 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 944 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 945 (void)StillOkay; 946 947 // Build up a textual representation of the ambiguous paths, e.g., 948 // D -> B -> A, that will be used to illustrate the ambiguous 949 // conversions in the diagnostic. We only print one of the paths 950 // to each base class subobject. 951 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 952 953 Diag(Loc, AmbigiousBaseConvID) 954 << Derived << Base << PathDisplayStr << Range << Name; 955 return true; 956} 957 958bool 959Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 960 SourceLocation Loc, SourceRange Range, 961 CXXCastPath *BasePath, 962 bool IgnoreAccess) { 963 return CheckDerivedToBaseConversion(Derived, Base, 964 IgnoreAccess ? 0 965 : diag::err_upcast_to_inaccessible_base, 966 diag::err_ambiguous_derived_to_base_conv, 967 Loc, Range, DeclarationName(), 968 BasePath); 969} 970 971 972/// @brief Builds a string representing ambiguous paths from a 973/// specific derived class to different subobjects of the same base 974/// class. 975/// 976/// This function builds a string that can be used in error messages 977/// to show the different paths that one can take through the 978/// inheritance hierarchy to go from the derived class to different 979/// subobjects of a base class. The result looks something like this: 980/// @code 981/// struct D -> struct B -> struct A 982/// struct D -> struct C -> struct A 983/// @endcode 984std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 985 std::string PathDisplayStr; 986 std::set<unsigned> DisplayedPaths; 987 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 988 Path != Paths.end(); ++Path) { 989 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 990 // We haven't displayed a path to this particular base 991 // class subobject yet. 992 PathDisplayStr += "\n "; 993 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 994 for (CXXBasePath::const_iterator Element = Path->begin(); 995 Element != Path->end(); ++Element) 996 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 997 } 998 } 999 1000 return PathDisplayStr; 1001} 1002 1003//===----------------------------------------------------------------------===// 1004// C++ class member Handling 1005//===----------------------------------------------------------------------===// 1006 1007/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1008Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1009 SourceLocation ASLoc, 1010 SourceLocation ColonLoc) { 1011 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1012 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1013 ASLoc, ColonLoc); 1014 CurContext->addHiddenDecl(ASDecl); 1015 return ASDecl; 1016} 1017 1018/// CheckOverrideControl - Check C++0x override control semantics. 1019void Sema::CheckOverrideControl(const Decl *D) { 1020 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1021 if (!MD || !MD->isVirtual()) 1022 return; 1023 1024 if (MD->isDependentContext()) 1025 return; 1026 1027 // C++0x [class.virtual]p3: 1028 // If a virtual function is marked with the virt-specifier override and does 1029 // not override a member function of a base class, 1030 // the program is ill-formed. 1031 bool HasOverriddenMethods = 1032 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1033 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1034 Diag(MD->getLocation(), 1035 diag::err_function_marked_override_not_overriding) 1036 << MD->getDeclName(); 1037 return; 1038 } 1039} 1040 1041/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1042/// function overrides a virtual member function marked 'final', according to 1043/// C++0x [class.virtual]p3. 1044bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1045 const CXXMethodDecl *Old) { 1046 if (!Old->hasAttr<FinalAttr>()) 1047 return false; 1048 1049 Diag(New->getLocation(), diag::err_final_function_overridden) 1050 << New->getDeclName(); 1051 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1052 return true; 1053} 1054 1055/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1056/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1057/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1058/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1059/// present but parsing it has been deferred. 1060Decl * 1061Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1062 MultiTemplateParamsArg TemplateParameterLists, 1063 Expr *BW, const VirtSpecifiers &VS, 1064 Expr *InitExpr, bool HasDeferredInit, 1065 bool IsDefinition) { 1066 const DeclSpec &DS = D.getDeclSpec(); 1067 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1068 DeclarationName Name = NameInfo.getName(); 1069 SourceLocation Loc = NameInfo.getLoc(); 1070 1071 // For anonymous bitfields, the location should point to the type. 1072 if (Loc.isInvalid()) 1073 Loc = D.getSourceRange().getBegin(); 1074 1075 Expr *BitWidth = static_cast<Expr*>(BW); 1076 Expr *Init = static_cast<Expr*>(InitExpr); 1077 1078 assert(isa<CXXRecordDecl>(CurContext)); 1079 assert(!DS.isFriendSpecified()); 1080 assert(!Init || !HasDeferredInit); 1081 1082 bool isFunc = D.isDeclarationOfFunction(); 1083 1084 // C++ 9.2p6: A member shall not be declared to have automatic storage 1085 // duration (auto, register) or with the extern storage-class-specifier. 1086 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1087 // data members and cannot be applied to names declared const or static, 1088 // and cannot be applied to reference members. 1089 switch (DS.getStorageClassSpec()) { 1090 case DeclSpec::SCS_unspecified: 1091 case DeclSpec::SCS_typedef: 1092 case DeclSpec::SCS_static: 1093 // FALL THROUGH. 1094 break; 1095 case DeclSpec::SCS_mutable: 1096 if (isFunc) { 1097 if (DS.getStorageClassSpecLoc().isValid()) 1098 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1099 else 1100 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1101 1102 // FIXME: It would be nicer if the keyword was ignored only for this 1103 // declarator. Otherwise we could get follow-up errors. 1104 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1105 } 1106 break; 1107 default: 1108 if (DS.getStorageClassSpecLoc().isValid()) 1109 Diag(DS.getStorageClassSpecLoc(), 1110 diag::err_storageclass_invalid_for_member); 1111 else 1112 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1113 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1114 } 1115 1116 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1117 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1118 !isFunc); 1119 1120 Decl *Member; 1121 if (isInstField) { 1122 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1123 1124 if (SS.isSet() && !SS.isInvalid()) { 1125 // The user provided a superfluous scope specifier inside a class 1126 // definition: 1127 // 1128 // class X { 1129 // int X::member; 1130 // }; 1131 DeclContext *DC = 0; 1132 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1133 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1134 << Name << FixItHint::CreateRemoval(SS.getRange()); 1135 else 1136 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1137 << Name << SS.getRange(); 1138 1139 SS.clear(); 1140 } 1141 1142 // FIXME: Check for template parameters! 1143 // FIXME: Check that the name is an identifier! 1144 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1145 HasDeferredInit, AS); 1146 assert(Member && "HandleField never returns null"); 1147 } else { 1148 assert(!HasDeferredInit); 1149 1150 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1151 if (!Member) { 1152 return 0; 1153 } 1154 1155 // Non-instance-fields can't have a bitfield. 1156 if (BitWidth) { 1157 if (Member->isInvalidDecl()) { 1158 // don't emit another diagnostic. 1159 } else if (isa<VarDecl>(Member)) { 1160 // C++ 9.6p3: A bit-field shall not be a static member. 1161 // "static member 'A' cannot be a bit-field" 1162 Diag(Loc, diag::err_static_not_bitfield) 1163 << Name << BitWidth->getSourceRange(); 1164 } else if (isa<TypedefDecl>(Member)) { 1165 // "typedef member 'x' cannot be a bit-field" 1166 Diag(Loc, diag::err_typedef_not_bitfield) 1167 << Name << BitWidth->getSourceRange(); 1168 } else { 1169 // A function typedef ("typedef int f(); f a;"). 1170 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1171 Diag(Loc, diag::err_not_integral_type_bitfield) 1172 << Name << cast<ValueDecl>(Member)->getType() 1173 << BitWidth->getSourceRange(); 1174 } 1175 1176 BitWidth = 0; 1177 Member->setInvalidDecl(); 1178 } 1179 1180 Member->setAccess(AS); 1181 1182 // If we have declared a member function template, set the access of the 1183 // templated declaration as well. 1184 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1185 FunTmpl->getTemplatedDecl()->setAccess(AS); 1186 } 1187 1188 if (VS.isOverrideSpecified()) { 1189 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1190 if (!MD || !MD->isVirtual()) { 1191 Diag(Member->getLocStart(), 1192 diag::override_keyword_only_allowed_on_virtual_member_functions) 1193 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1194 } else 1195 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1196 } 1197 if (VS.isFinalSpecified()) { 1198 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1199 if (!MD || !MD->isVirtual()) { 1200 Diag(Member->getLocStart(), 1201 diag::override_keyword_only_allowed_on_virtual_member_functions) 1202 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1203 } else 1204 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1205 } 1206 1207 if (VS.getLastLocation().isValid()) { 1208 // Update the end location of a method that has a virt-specifiers. 1209 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1210 MD->setRangeEnd(VS.getLastLocation()); 1211 } 1212 1213 CheckOverrideControl(Member); 1214 1215 assert((Name || isInstField) && "No identifier for non-field ?"); 1216 1217 if (Init) 1218 AddInitializerToDecl(Member, Init, false, 1219 DS.getTypeSpecType() == DeclSpec::TST_auto); 1220 else if (DS.getTypeSpecType() == DeclSpec::TST_auto && 1221 DS.getStorageClassSpec() == DeclSpec::SCS_static) { 1222 // C++0x [dcl.spec.auto]p4: 'auto' can only be used in the type of a static 1223 // data member if a brace-or-equal-initializer is provided. 1224 Diag(Loc, diag::err_auto_var_requires_init) 1225 << Name << cast<ValueDecl>(Member)->getType(); 1226 Member->setInvalidDecl(); 1227 } 1228 1229 FinalizeDeclaration(Member); 1230 1231 if (isInstField) 1232 FieldCollector->Add(cast<FieldDecl>(Member)); 1233 return Member; 1234} 1235 1236/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1237/// in-class initializer for a non-static C++ class member, and after 1238/// instantiating an in-class initializer in a class template. Such actions 1239/// are deferred until the class is complete. 1240void 1241Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1242 Expr *InitExpr) { 1243 FieldDecl *FD = cast<FieldDecl>(D); 1244 1245 if (!InitExpr) { 1246 FD->setInvalidDecl(); 1247 FD->removeInClassInitializer(); 1248 return; 1249 } 1250 1251 ExprResult Init = InitExpr; 1252 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1253 // FIXME: if there is no EqualLoc, this is list-initialization. 1254 Init = PerformCopyInitialization( 1255 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1256 if (Init.isInvalid()) { 1257 FD->setInvalidDecl(); 1258 return; 1259 } 1260 1261 CheckImplicitConversions(Init.get(), EqualLoc); 1262 } 1263 1264 // C++0x [class.base.init]p7: 1265 // The initialization of each base and member constitutes a 1266 // full-expression. 1267 Init = MaybeCreateExprWithCleanups(Init); 1268 if (Init.isInvalid()) { 1269 FD->setInvalidDecl(); 1270 return; 1271 } 1272 1273 InitExpr = Init.release(); 1274 1275 FD->setInClassInitializer(InitExpr); 1276} 1277 1278/// \brief Find the direct and/or virtual base specifiers that 1279/// correspond to the given base type, for use in base initialization 1280/// within a constructor. 1281static bool FindBaseInitializer(Sema &SemaRef, 1282 CXXRecordDecl *ClassDecl, 1283 QualType BaseType, 1284 const CXXBaseSpecifier *&DirectBaseSpec, 1285 const CXXBaseSpecifier *&VirtualBaseSpec) { 1286 // First, check for a direct base class. 1287 DirectBaseSpec = 0; 1288 for (CXXRecordDecl::base_class_const_iterator Base 1289 = ClassDecl->bases_begin(); 1290 Base != ClassDecl->bases_end(); ++Base) { 1291 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1292 // We found a direct base of this type. That's what we're 1293 // initializing. 1294 DirectBaseSpec = &*Base; 1295 break; 1296 } 1297 } 1298 1299 // Check for a virtual base class. 1300 // FIXME: We might be able to short-circuit this if we know in advance that 1301 // there are no virtual bases. 1302 VirtualBaseSpec = 0; 1303 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1304 // We haven't found a base yet; search the class hierarchy for a 1305 // virtual base class. 1306 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1307 /*DetectVirtual=*/false); 1308 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1309 BaseType, Paths)) { 1310 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1311 Path != Paths.end(); ++Path) { 1312 if (Path->back().Base->isVirtual()) { 1313 VirtualBaseSpec = Path->back().Base; 1314 break; 1315 } 1316 } 1317 } 1318 } 1319 1320 return DirectBaseSpec || VirtualBaseSpec; 1321} 1322 1323/// ActOnMemInitializer - Handle a C++ member initializer. 1324MemInitResult 1325Sema::ActOnMemInitializer(Decl *ConstructorD, 1326 Scope *S, 1327 CXXScopeSpec &SS, 1328 IdentifierInfo *MemberOrBase, 1329 ParsedType TemplateTypeTy, 1330 SourceLocation IdLoc, 1331 SourceLocation LParenLoc, 1332 Expr **Args, unsigned NumArgs, 1333 SourceLocation RParenLoc, 1334 SourceLocation EllipsisLoc) { 1335 if (!ConstructorD) 1336 return true; 1337 1338 AdjustDeclIfTemplate(ConstructorD); 1339 1340 CXXConstructorDecl *Constructor 1341 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1342 if (!Constructor) { 1343 // The user wrote a constructor initializer on a function that is 1344 // not a C++ constructor. Ignore the error for now, because we may 1345 // have more member initializers coming; we'll diagnose it just 1346 // once in ActOnMemInitializers. 1347 return true; 1348 } 1349 1350 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1351 1352 // C++ [class.base.init]p2: 1353 // Names in a mem-initializer-id are looked up in the scope of the 1354 // constructor's class and, if not found in that scope, are looked 1355 // up in the scope containing the constructor's definition. 1356 // [Note: if the constructor's class contains a member with the 1357 // same name as a direct or virtual base class of the class, a 1358 // mem-initializer-id naming the member or base class and composed 1359 // of a single identifier refers to the class member. A 1360 // mem-initializer-id for the hidden base class may be specified 1361 // using a qualified name. ] 1362 if (!SS.getScopeRep() && !TemplateTypeTy) { 1363 // Look for a member, first. 1364 FieldDecl *Member = 0; 1365 DeclContext::lookup_result Result 1366 = ClassDecl->lookup(MemberOrBase); 1367 if (Result.first != Result.second) { 1368 Member = dyn_cast<FieldDecl>(*Result.first); 1369 1370 if (Member) { 1371 if (EllipsisLoc.isValid()) 1372 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1373 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1374 1375 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1376 LParenLoc, RParenLoc); 1377 } 1378 1379 // Handle anonymous union case. 1380 if (IndirectFieldDecl* IndirectField 1381 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1382 if (EllipsisLoc.isValid()) 1383 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1384 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1385 1386 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1387 NumArgs, IdLoc, 1388 LParenLoc, RParenLoc); 1389 } 1390 } 1391 } 1392 // It didn't name a member, so see if it names a class. 1393 QualType BaseType; 1394 TypeSourceInfo *TInfo = 0; 1395 1396 if (TemplateTypeTy) { 1397 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1398 } else { 1399 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1400 LookupParsedName(R, S, &SS); 1401 1402 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1403 if (!TyD) { 1404 if (R.isAmbiguous()) return true; 1405 1406 // We don't want access-control diagnostics here. 1407 R.suppressDiagnostics(); 1408 1409 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1410 bool NotUnknownSpecialization = false; 1411 DeclContext *DC = computeDeclContext(SS, false); 1412 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1413 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1414 1415 if (!NotUnknownSpecialization) { 1416 // When the scope specifier can refer to a member of an unknown 1417 // specialization, we take it as a type name. 1418 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1419 SS.getWithLocInContext(Context), 1420 *MemberOrBase, IdLoc); 1421 if (BaseType.isNull()) 1422 return true; 1423 1424 R.clear(); 1425 R.setLookupName(MemberOrBase); 1426 } 1427 } 1428 1429 // If no results were found, try to correct typos. 1430 TypoCorrection Corr; 1431 if (R.empty() && BaseType.isNull() && 1432 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1433 ClassDecl, false, CTC_NoKeywords))) { 1434 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1435 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1436 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1437 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1438 // We have found a non-static data member with a similar 1439 // name to what was typed; complain and initialize that 1440 // member. 1441 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1442 << MemberOrBase << true << CorrectedQuotedStr 1443 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1444 Diag(Member->getLocation(), diag::note_previous_decl) 1445 << CorrectedQuotedStr; 1446 1447 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1448 LParenLoc, RParenLoc); 1449 } 1450 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1451 const CXXBaseSpecifier *DirectBaseSpec; 1452 const CXXBaseSpecifier *VirtualBaseSpec; 1453 if (FindBaseInitializer(*this, ClassDecl, 1454 Context.getTypeDeclType(Type), 1455 DirectBaseSpec, VirtualBaseSpec)) { 1456 // We have found a direct or virtual base class with a 1457 // similar name to what was typed; complain and initialize 1458 // that base class. 1459 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1460 << MemberOrBase << false << CorrectedQuotedStr 1461 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1462 1463 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1464 : VirtualBaseSpec; 1465 Diag(BaseSpec->getSourceRange().getBegin(), 1466 diag::note_base_class_specified_here) 1467 << BaseSpec->getType() 1468 << BaseSpec->getSourceRange(); 1469 1470 TyD = Type; 1471 } 1472 } 1473 } 1474 1475 if (!TyD && BaseType.isNull()) { 1476 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1477 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1478 return true; 1479 } 1480 } 1481 1482 if (BaseType.isNull()) { 1483 BaseType = Context.getTypeDeclType(TyD); 1484 if (SS.isSet()) { 1485 NestedNameSpecifier *Qualifier = 1486 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1487 1488 // FIXME: preserve source range information 1489 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1490 } 1491 } 1492 } 1493 1494 if (!TInfo) 1495 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1496 1497 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1498 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1499} 1500 1501/// Checks a member initializer expression for cases where reference (or 1502/// pointer) members are bound to by-value parameters (or their addresses). 1503static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1504 Expr *Init, 1505 SourceLocation IdLoc) { 1506 QualType MemberTy = Member->getType(); 1507 1508 // We only handle pointers and references currently. 1509 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1510 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1511 return; 1512 1513 const bool IsPointer = MemberTy->isPointerType(); 1514 if (IsPointer) { 1515 if (const UnaryOperator *Op 1516 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1517 // The only case we're worried about with pointers requires taking the 1518 // address. 1519 if (Op->getOpcode() != UO_AddrOf) 1520 return; 1521 1522 Init = Op->getSubExpr(); 1523 } else { 1524 // We only handle address-of expression initializers for pointers. 1525 return; 1526 } 1527 } 1528 1529 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1530 // Taking the address of a temporary will be diagnosed as a hard error. 1531 if (IsPointer) 1532 return; 1533 1534 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1535 << Member << Init->getSourceRange(); 1536 } else if (const DeclRefExpr *DRE 1537 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1538 // We only warn when referring to a non-reference parameter declaration. 1539 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1540 if (!Parameter || Parameter->getType()->isReferenceType()) 1541 return; 1542 1543 S.Diag(Init->getExprLoc(), 1544 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1545 : diag::warn_bind_ref_member_to_parameter) 1546 << Member << Parameter << Init->getSourceRange(); 1547 } else { 1548 // Other initializers are fine. 1549 return; 1550 } 1551 1552 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1553 << (unsigned)IsPointer; 1554} 1555 1556/// Checks an initializer expression for use of uninitialized fields, such as 1557/// containing the field that is being initialized. Returns true if there is an 1558/// uninitialized field was used an updates the SourceLocation parameter; false 1559/// otherwise. 1560static bool InitExprContainsUninitializedFields(const Stmt *S, 1561 const ValueDecl *LhsField, 1562 SourceLocation *L) { 1563 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1564 1565 if (isa<CallExpr>(S)) { 1566 // Do not descend into function calls or constructors, as the use 1567 // of an uninitialized field may be valid. One would have to inspect 1568 // the contents of the function/ctor to determine if it is safe or not. 1569 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1570 // may be safe, depending on what the function/ctor does. 1571 return false; 1572 } 1573 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1574 const NamedDecl *RhsField = ME->getMemberDecl(); 1575 1576 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1577 // The member expression points to a static data member. 1578 assert(VD->isStaticDataMember() && 1579 "Member points to non-static data member!"); 1580 (void)VD; 1581 return false; 1582 } 1583 1584 if (isa<EnumConstantDecl>(RhsField)) { 1585 // The member expression points to an enum. 1586 return false; 1587 } 1588 1589 if (RhsField == LhsField) { 1590 // Initializing a field with itself. Throw a warning. 1591 // But wait; there are exceptions! 1592 // Exception #1: The field may not belong to this record. 1593 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1594 const Expr *base = ME->getBase(); 1595 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1596 // Even though the field matches, it does not belong to this record. 1597 return false; 1598 } 1599 // None of the exceptions triggered; return true to indicate an 1600 // uninitialized field was used. 1601 *L = ME->getMemberLoc(); 1602 return true; 1603 } 1604 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1605 // sizeof/alignof doesn't reference contents, do not warn. 1606 return false; 1607 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1608 // address-of doesn't reference contents (the pointer may be dereferenced 1609 // in the same expression but it would be rare; and weird). 1610 if (UOE->getOpcode() == UO_AddrOf) 1611 return false; 1612 } 1613 for (Stmt::const_child_range it = S->children(); it; ++it) { 1614 if (!*it) { 1615 // An expression such as 'member(arg ?: "")' may trigger this. 1616 continue; 1617 } 1618 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1619 return true; 1620 } 1621 return false; 1622} 1623 1624MemInitResult 1625Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1626 unsigned NumArgs, SourceLocation IdLoc, 1627 SourceLocation LParenLoc, 1628 SourceLocation RParenLoc) { 1629 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1630 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1631 assert((DirectMember || IndirectMember) && 1632 "Member must be a FieldDecl or IndirectFieldDecl"); 1633 1634 if (Member->isInvalidDecl()) 1635 return true; 1636 1637 // Diagnose value-uses of fields to initialize themselves, e.g. 1638 // foo(foo) 1639 // where foo is not also a parameter to the constructor. 1640 // TODO: implement -Wuninitialized and fold this into that framework. 1641 for (unsigned i = 0; i < NumArgs; ++i) { 1642 SourceLocation L; 1643 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1644 // FIXME: Return true in the case when other fields are used before being 1645 // uninitialized. For example, let this field be the i'th field. When 1646 // initializing the i'th field, throw a warning if any of the >= i'th 1647 // fields are used, as they are not yet initialized. 1648 // Right now we are only handling the case where the i'th field uses 1649 // itself in its initializer. 1650 Diag(L, diag::warn_field_is_uninit); 1651 } 1652 } 1653 1654 bool HasDependentArg = false; 1655 for (unsigned i = 0; i < NumArgs; i++) 1656 HasDependentArg |= Args[i]->isTypeDependent(); 1657 1658 Expr *Init; 1659 if (Member->getType()->isDependentType() || HasDependentArg) { 1660 // Can't check initialization for a member of dependent type or when 1661 // any of the arguments are type-dependent expressions. 1662 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1663 RParenLoc, 1664 Member->getType().getNonReferenceType()); 1665 1666 DiscardCleanupsInEvaluationContext(); 1667 } else { 1668 // Initialize the member. 1669 InitializedEntity MemberEntity = 1670 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1671 : InitializedEntity::InitializeMember(IndirectMember, 0); 1672 InitializationKind Kind = 1673 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1674 1675 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1676 1677 ExprResult MemberInit = 1678 InitSeq.Perform(*this, MemberEntity, Kind, 1679 MultiExprArg(*this, Args, NumArgs), 0); 1680 if (MemberInit.isInvalid()) 1681 return true; 1682 1683 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1684 1685 // C++0x [class.base.init]p7: 1686 // The initialization of each base and member constitutes a 1687 // full-expression. 1688 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1689 if (MemberInit.isInvalid()) 1690 return true; 1691 1692 // If we are in a dependent context, template instantiation will 1693 // perform this type-checking again. Just save the arguments that we 1694 // received in a ParenListExpr. 1695 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1696 // of the information that we have about the member 1697 // initializer. However, deconstructing the ASTs is a dicey process, 1698 // and this approach is far more likely to get the corner cases right. 1699 if (CurContext->isDependentContext()) { 1700 Init = new (Context) ParenListExpr( 1701 Context, LParenLoc, Args, NumArgs, RParenLoc, 1702 Member->getType().getNonReferenceType()); 1703 } else { 1704 Init = MemberInit.get(); 1705 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 1706 } 1707 } 1708 1709 if (DirectMember) { 1710 return new (Context) CXXCtorInitializer(Context, DirectMember, 1711 IdLoc, LParenLoc, Init, 1712 RParenLoc); 1713 } else { 1714 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1715 IdLoc, LParenLoc, Init, 1716 RParenLoc); 1717 } 1718} 1719 1720MemInitResult 1721Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1722 Expr **Args, unsigned NumArgs, 1723 SourceLocation NameLoc, 1724 SourceLocation LParenLoc, 1725 SourceLocation RParenLoc, 1726 CXXRecordDecl *ClassDecl) { 1727 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1728 if (!LangOpts.CPlusPlus0x) 1729 return Diag(Loc, diag::err_delegation_0x_only) 1730 << TInfo->getTypeLoc().getLocalSourceRange(); 1731 1732 // Initialize the object. 1733 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1734 QualType(ClassDecl->getTypeForDecl(), 0)); 1735 InitializationKind Kind = 1736 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1737 1738 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1739 1740 ExprResult DelegationInit = 1741 InitSeq.Perform(*this, DelegationEntity, Kind, 1742 MultiExprArg(*this, Args, NumArgs), 0); 1743 if (DelegationInit.isInvalid()) 1744 return true; 1745 1746 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1747 CXXConstructorDecl *Constructor 1748 = ConExpr->getConstructor(); 1749 assert(Constructor && "Delegating constructor with no target?"); 1750 1751 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1752 1753 // C++0x [class.base.init]p7: 1754 // The initialization of each base and member constitutes a 1755 // full-expression. 1756 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1757 if (DelegationInit.isInvalid()) 1758 return true; 1759 1760 assert(!CurContext->isDependentContext()); 1761 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1762 DelegationInit.takeAs<Expr>(), 1763 RParenLoc); 1764} 1765 1766MemInitResult 1767Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1768 Expr **Args, unsigned NumArgs, 1769 SourceLocation LParenLoc, SourceLocation RParenLoc, 1770 CXXRecordDecl *ClassDecl, 1771 SourceLocation EllipsisLoc) { 1772 bool HasDependentArg = false; 1773 for (unsigned i = 0; i < NumArgs; i++) 1774 HasDependentArg |= Args[i]->isTypeDependent(); 1775 1776 SourceLocation BaseLoc 1777 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1778 1779 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1780 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1781 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1782 1783 // C++ [class.base.init]p2: 1784 // [...] Unless the mem-initializer-id names a nonstatic data 1785 // member of the constructor's class or a direct or virtual base 1786 // of that class, the mem-initializer is ill-formed. A 1787 // mem-initializer-list can initialize a base class using any 1788 // name that denotes that base class type. 1789 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1790 1791 if (EllipsisLoc.isValid()) { 1792 // This is a pack expansion. 1793 if (!BaseType->containsUnexpandedParameterPack()) { 1794 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1795 << SourceRange(BaseLoc, RParenLoc); 1796 1797 EllipsisLoc = SourceLocation(); 1798 } 1799 } else { 1800 // Check for any unexpanded parameter packs. 1801 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1802 return true; 1803 1804 for (unsigned I = 0; I != NumArgs; ++I) 1805 if (DiagnoseUnexpandedParameterPack(Args[I])) 1806 return true; 1807 } 1808 1809 // Check for direct and virtual base classes. 1810 const CXXBaseSpecifier *DirectBaseSpec = 0; 1811 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1812 if (!Dependent) { 1813 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1814 BaseType)) 1815 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1816 LParenLoc, RParenLoc, ClassDecl); 1817 1818 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1819 VirtualBaseSpec); 1820 1821 // C++ [base.class.init]p2: 1822 // Unless the mem-initializer-id names a nonstatic data member of the 1823 // constructor's class or a direct or virtual base of that class, the 1824 // mem-initializer is ill-formed. 1825 if (!DirectBaseSpec && !VirtualBaseSpec) { 1826 // If the class has any dependent bases, then it's possible that 1827 // one of those types will resolve to the same type as 1828 // BaseType. Therefore, just treat this as a dependent base 1829 // class initialization. FIXME: Should we try to check the 1830 // initialization anyway? It seems odd. 1831 if (ClassDecl->hasAnyDependentBases()) 1832 Dependent = true; 1833 else 1834 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1835 << BaseType << Context.getTypeDeclType(ClassDecl) 1836 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1837 } 1838 } 1839 1840 if (Dependent) { 1841 // Can't check initialization for a base of dependent type or when 1842 // any of the arguments are type-dependent expressions. 1843 ExprResult BaseInit 1844 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1845 RParenLoc, BaseType)); 1846 1847 DiscardCleanupsInEvaluationContext(); 1848 1849 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1850 /*IsVirtual=*/false, 1851 LParenLoc, 1852 BaseInit.takeAs<Expr>(), 1853 RParenLoc, 1854 EllipsisLoc); 1855 } 1856 1857 // C++ [base.class.init]p2: 1858 // If a mem-initializer-id is ambiguous because it designates both 1859 // a direct non-virtual base class and an inherited virtual base 1860 // class, the mem-initializer is ill-formed. 1861 if (DirectBaseSpec && VirtualBaseSpec) 1862 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1863 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1864 1865 CXXBaseSpecifier *BaseSpec 1866 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1867 if (!BaseSpec) 1868 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1869 1870 // Initialize the base. 1871 InitializedEntity BaseEntity = 1872 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1873 InitializationKind Kind = 1874 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1875 1876 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1877 1878 ExprResult BaseInit = 1879 InitSeq.Perform(*this, BaseEntity, Kind, 1880 MultiExprArg(*this, Args, NumArgs), 0); 1881 if (BaseInit.isInvalid()) 1882 return true; 1883 1884 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1885 1886 // C++0x [class.base.init]p7: 1887 // The initialization of each base and member constitutes a 1888 // full-expression. 1889 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1890 if (BaseInit.isInvalid()) 1891 return true; 1892 1893 // If we are in a dependent context, template instantiation will 1894 // perform this type-checking again. Just save the arguments that we 1895 // received in a ParenListExpr. 1896 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1897 // of the information that we have about the base 1898 // initializer. However, deconstructing the ASTs is a dicey process, 1899 // and this approach is far more likely to get the corner cases right. 1900 if (CurContext->isDependentContext()) { 1901 ExprResult Init 1902 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1903 RParenLoc, BaseType)); 1904 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1905 BaseSpec->isVirtual(), 1906 LParenLoc, 1907 Init.takeAs<Expr>(), 1908 RParenLoc, 1909 EllipsisLoc); 1910 } 1911 1912 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1913 BaseSpec->isVirtual(), 1914 LParenLoc, 1915 BaseInit.takeAs<Expr>(), 1916 RParenLoc, 1917 EllipsisLoc); 1918} 1919 1920// Create a static_cast\<T&&>(expr). 1921static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 1922 QualType ExprType = E->getType(); 1923 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 1924 SourceLocation ExprLoc = E->getLocStart(); 1925 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 1926 TargetType, ExprLoc); 1927 1928 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 1929 SourceRange(ExprLoc, ExprLoc), 1930 E->getSourceRange()).take(); 1931} 1932 1933/// ImplicitInitializerKind - How an implicit base or member initializer should 1934/// initialize its base or member. 1935enum ImplicitInitializerKind { 1936 IIK_Default, 1937 IIK_Copy, 1938 IIK_Move 1939}; 1940 1941static bool 1942BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1943 ImplicitInitializerKind ImplicitInitKind, 1944 CXXBaseSpecifier *BaseSpec, 1945 bool IsInheritedVirtualBase, 1946 CXXCtorInitializer *&CXXBaseInit) { 1947 InitializedEntity InitEntity 1948 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1949 IsInheritedVirtualBase); 1950 1951 ExprResult BaseInit; 1952 1953 switch (ImplicitInitKind) { 1954 case IIK_Default: { 1955 InitializationKind InitKind 1956 = InitializationKind::CreateDefault(Constructor->getLocation()); 1957 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1958 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1959 MultiExprArg(SemaRef, 0, 0)); 1960 break; 1961 } 1962 1963 case IIK_Move: 1964 case IIK_Copy: { 1965 bool Moving = ImplicitInitKind == IIK_Move; 1966 ParmVarDecl *Param = Constructor->getParamDecl(0); 1967 QualType ParamType = Param->getType().getNonReferenceType(); 1968 1969 Expr *CopyCtorArg = 1970 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1971 Constructor->getLocation(), ParamType, 1972 VK_LValue, 0); 1973 1974 // Cast to the base class to avoid ambiguities. 1975 QualType ArgTy = 1976 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1977 ParamType.getQualifiers()); 1978 1979 if (Moving) { 1980 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 1981 } 1982 1983 CXXCastPath BasePath; 1984 BasePath.push_back(BaseSpec); 1985 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1986 CK_UncheckedDerivedToBase, 1987 Moving ? VK_XValue : VK_LValue, 1988 &BasePath).take(); 1989 1990 InitializationKind InitKind 1991 = InitializationKind::CreateDirect(Constructor->getLocation(), 1992 SourceLocation(), SourceLocation()); 1993 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1994 &CopyCtorArg, 1); 1995 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1996 MultiExprArg(&CopyCtorArg, 1)); 1997 break; 1998 } 1999 } 2000 2001 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2002 if (BaseInit.isInvalid()) 2003 return true; 2004 2005 CXXBaseInit = 2006 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2007 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2008 SourceLocation()), 2009 BaseSpec->isVirtual(), 2010 SourceLocation(), 2011 BaseInit.takeAs<Expr>(), 2012 SourceLocation(), 2013 SourceLocation()); 2014 2015 return false; 2016} 2017 2018static bool RefersToRValueRef(Expr *MemRef) { 2019 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2020 return Referenced->getType()->isRValueReferenceType(); 2021} 2022 2023static bool 2024BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2025 ImplicitInitializerKind ImplicitInitKind, 2026 FieldDecl *Field, IndirectFieldDecl *Indirect, 2027 CXXCtorInitializer *&CXXMemberInit) { 2028 if (Field->isInvalidDecl()) 2029 return true; 2030 2031 SourceLocation Loc = Constructor->getLocation(); 2032 2033 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2034 bool Moving = ImplicitInitKind == IIK_Move; 2035 ParmVarDecl *Param = Constructor->getParamDecl(0); 2036 QualType ParamType = Param->getType().getNonReferenceType(); 2037 2038 // Suppress copying zero-width bitfields. 2039 if (const Expr *Width = Field->getBitWidth()) 2040 if (Width->EvaluateAsInt(SemaRef.Context) == 0) 2041 return false; 2042 2043 Expr *MemberExprBase = 2044 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2045 Loc, ParamType, VK_LValue, 0); 2046 2047 if (Moving) { 2048 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2049 } 2050 2051 // Build a reference to this field within the parameter. 2052 CXXScopeSpec SS; 2053 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2054 Sema::LookupMemberName); 2055 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2056 : cast<ValueDecl>(Field), AS_public); 2057 MemberLookup.resolveKind(); 2058 ExprResult CtorArg 2059 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2060 ParamType, Loc, 2061 /*IsArrow=*/false, 2062 SS, 2063 /*FirstQualifierInScope=*/0, 2064 MemberLookup, 2065 /*TemplateArgs=*/0); 2066 if (CtorArg.isInvalid()) 2067 return true; 2068 2069 // C++11 [class.copy]p15: 2070 // - if a member m has rvalue reference type T&&, it is direct-initialized 2071 // with static_cast<T&&>(x.m); 2072 if (RefersToRValueRef(CtorArg.get())) { 2073 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2074 } 2075 2076 // When the field we are copying is an array, create index variables for 2077 // each dimension of the array. We use these index variables to subscript 2078 // the source array, and other clients (e.g., CodeGen) will perform the 2079 // necessary iteration with these index variables. 2080 SmallVector<VarDecl *, 4> IndexVariables; 2081 QualType BaseType = Field->getType(); 2082 QualType SizeType = SemaRef.Context.getSizeType(); 2083 bool InitializingArray = false; 2084 while (const ConstantArrayType *Array 2085 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2086 InitializingArray = true; 2087 // Create the iteration variable for this array index. 2088 IdentifierInfo *IterationVarName = 0; 2089 { 2090 llvm::SmallString<8> Str; 2091 llvm::raw_svector_ostream OS(Str); 2092 OS << "__i" << IndexVariables.size(); 2093 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2094 } 2095 VarDecl *IterationVar 2096 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2097 IterationVarName, SizeType, 2098 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2099 SC_None, SC_None); 2100 IndexVariables.push_back(IterationVar); 2101 2102 // Create a reference to the iteration variable. 2103 ExprResult IterationVarRef 2104 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2105 assert(!IterationVarRef.isInvalid() && 2106 "Reference to invented variable cannot fail!"); 2107 2108 // Subscript the array with this iteration variable. 2109 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2110 IterationVarRef.take(), 2111 Loc); 2112 if (CtorArg.isInvalid()) 2113 return true; 2114 2115 BaseType = Array->getElementType(); 2116 } 2117 2118 // The array subscript expression is an lvalue, which is wrong for moving. 2119 if (Moving && InitializingArray) 2120 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2121 2122 // Construct the entity that we will be initializing. For an array, this 2123 // will be first element in the array, which may require several levels 2124 // of array-subscript entities. 2125 SmallVector<InitializedEntity, 4> Entities; 2126 Entities.reserve(1 + IndexVariables.size()); 2127 if (Indirect) 2128 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2129 else 2130 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2131 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2132 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2133 0, 2134 Entities.back())); 2135 2136 // Direct-initialize to use the copy constructor. 2137 InitializationKind InitKind = 2138 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2139 2140 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2141 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2142 &CtorArgE, 1); 2143 2144 ExprResult MemberInit 2145 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2146 MultiExprArg(&CtorArgE, 1)); 2147 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2148 if (MemberInit.isInvalid()) 2149 return true; 2150 2151 if (Indirect) { 2152 assert(IndexVariables.size() == 0 && 2153 "Indirect field improperly initialized"); 2154 CXXMemberInit 2155 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2156 Loc, Loc, 2157 MemberInit.takeAs<Expr>(), 2158 Loc); 2159 } else 2160 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2161 Loc, MemberInit.takeAs<Expr>(), 2162 Loc, 2163 IndexVariables.data(), 2164 IndexVariables.size()); 2165 return false; 2166 } 2167 2168 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2169 2170 QualType FieldBaseElementType = 2171 SemaRef.Context.getBaseElementType(Field->getType()); 2172 2173 if (FieldBaseElementType->isRecordType()) { 2174 InitializedEntity InitEntity 2175 = Indirect? InitializedEntity::InitializeMember(Indirect) 2176 : InitializedEntity::InitializeMember(Field); 2177 InitializationKind InitKind = 2178 InitializationKind::CreateDefault(Loc); 2179 2180 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2181 ExprResult MemberInit = 2182 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2183 2184 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2185 if (MemberInit.isInvalid()) 2186 return true; 2187 2188 if (Indirect) 2189 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2190 Indirect, Loc, 2191 Loc, 2192 MemberInit.get(), 2193 Loc); 2194 else 2195 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2196 Field, Loc, Loc, 2197 MemberInit.get(), 2198 Loc); 2199 return false; 2200 } 2201 2202 if (!Field->getParent()->isUnion()) { 2203 if (FieldBaseElementType->isReferenceType()) { 2204 SemaRef.Diag(Constructor->getLocation(), 2205 diag::err_uninitialized_member_in_ctor) 2206 << (int)Constructor->isImplicit() 2207 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2208 << 0 << Field->getDeclName(); 2209 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2210 return true; 2211 } 2212 2213 if (FieldBaseElementType.isConstQualified()) { 2214 SemaRef.Diag(Constructor->getLocation(), 2215 diag::err_uninitialized_member_in_ctor) 2216 << (int)Constructor->isImplicit() 2217 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2218 << 1 << Field->getDeclName(); 2219 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2220 return true; 2221 } 2222 } 2223 2224 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2225 FieldBaseElementType->isObjCRetainableType() && 2226 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2227 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2228 // Instant objects: 2229 // Default-initialize Objective-C pointers to NULL. 2230 CXXMemberInit 2231 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2232 Loc, Loc, 2233 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2234 Loc); 2235 return false; 2236 } 2237 2238 // Nothing to initialize. 2239 CXXMemberInit = 0; 2240 return false; 2241} 2242 2243namespace { 2244struct BaseAndFieldInfo { 2245 Sema &S; 2246 CXXConstructorDecl *Ctor; 2247 bool AnyErrorsInInits; 2248 ImplicitInitializerKind IIK; 2249 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2250 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2251 2252 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2253 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2254 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2255 if (Generated && Ctor->isCopyConstructor()) 2256 IIK = IIK_Copy; 2257 else if (Generated && Ctor->isMoveConstructor()) 2258 IIK = IIK_Move; 2259 else 2260 IIK = IIK_Default; 2261 } 2262}; 2263} 2264 2265static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2266 FieldDecl *Field, 2267 IndirectFieldDecl *Indirect = 0) { 2268 2269 // Overwhelmingly common case: we have a direct initializer for this field. 2270 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2271 Info.AllToInit.push_back(Init); 2272 return false; 2273 } 2274 2275 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2276 // has a brace-or-equal-initializer, the entity is initialized as specified 2277 // in [dcl.init]. 2278 if (Field->hasInClassInitializer()) { 2279 CXXCtorInitializer *Init; 2280 if (Indirect) 2281 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2282 SourceLocation(), 2283 SourceLocation(), 0, 2284 SourceLocation()); 2285 else 2286 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2287 SourceLocation(), 2288 SourceLocation(), 0, 2289 SourceLocation()); 2290 Info.AllToInit.push_back(Init); 2291 return false; 2292 } 2293 2294 // Don't try to build an implicit initializer if there were semantic 2295 // errors in any of the initializers (and therefore we might be 2296 // missing some that the user actually wrote). 2297 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2298 return false; 2299 2300 CXXCtorInitializer *Init = 0; 2301 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2302 Indirect, Init)) 2303 return true; 2304 2305 if (Init) 2306 Info.AllToInit.push_back(Init); 2307 2308 return false; 2309} 2310 2311bool 2312Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2313 CXXCtorInitializer *Initializer) { 2314 assert(Initializer->isDelegatingInitializer()); 2315 Constructor->setNumCtorInitializers(1); 2316 CXXCtorInitializer **initializer = 2317 new (Context) CXXCtorInitializer*[1]; 2318 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2319 Constructor->setCtorInitializers(initializer); 2320 2321 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2322 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2323 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2324 } 2325 2326 DelegatingCtorDecls.push_back(Constructor); 2327 2328 return false; 2329} 2330 2331/// \brief Determine whether the given indirect field declaration is somewhere 2332/// within an anonymous union. 2333static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2334 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2335 CEnd = F->chain_end(); 2336 C != CEnd; ++C) 2337 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2338 if (Record->isUnion()) 2339 return true; 2340 2341 return false; 2342} 2343 2344bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2345 CXXCtorInitializer **Initializers, 2346 unsigned NumInitializers, 2347 bool AnyErrors) { 2348 if (Constructor->getDeclContext()->isDependentContext()) { 2349 // Just store the initializers as written, they will be checked during 2350 // instantiation. 2351 if (NumInitializers > 0) { 2352 Constructor->setNumCtorInitializers(NumInitializers); 2353 CXXCtorInitializer **baseOrMemberInitializers = 2354 new (Context) CXXCtorInitializer*[NumInitializers]; 2355 memcpy(baseOrMemberInitializers, Initializers, 2356 NumInitializers * sizeof(CXXCtorInitializer*)); 2357 Constructor->setCtorInitializers(baseOrMemberInitializers); 2358 } 2359 2360 return false; 2361 } 2362 2363 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2364 2365 // We need to build the initializer AST according to order of construction 2366 // and not what user specified in the Initializers list. 2367 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2368 if (!ClassDecl) 2369 return true; 2370 2371 bool HadError = false; 2372 2373 for (unsigned i = 0; i < NumInitializers; i++) { 2374 CXXCtorInitializer *Member = Initializers[i]; 2375 2376 if (Member->isBaseInitializer()) 2377 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2378 else 2379 Info.AllBaseFields[Member->getAnyMember()] = Member; 2380 } 2381 2382 // Keep track of the direct virtual bases. 2383 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2384 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2385 E = ClassDecl->bases_end(); I != E; ++I) { 2386 if (I->isVirtual()) 2387 DirectVBases.insert(I); 2388 } 2389 2390 // Push virtual bases before others. 2391 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2392 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2393 2394 if (CXXCtorInitializer *Value 2395 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2396 Info.AllToInit.push_back(Value); 2397 } else if (!AnyErrors) { 2398 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2399 CXXCtorInitializer *CXXBaseInit; 2400 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2401 VBase, IsInheritedVirtualBase, 2402 CXXBaseInit)) { 2403 HadError = true; 2404 continue; 2405 } 2406 2407 Info.AllToInit.push_back(CXXBaseInit); 2408 } 2409 } 2410 2411 // Non-virtual bases. 2412 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2413 E = ClassDecl->bases_end(); Base != E; ++Base) { 2414 // Virtuals are in the virtual base list and already constructed. 2415 if (Base->isVirtual()) 2416 continue; 2417 2418 if (CXXCtorInitializer *Value 2419 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2420 Info.AllToInit.push_back(Value); 2421 } else if (!AnyErrors) { 2422 CXXCtorInitializer *CXXBaseInit; 2423 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2424 Base, /*IsInheritedVirtualBase=*/false, 2425 CXXBaseInit)) { 2426 HadError = true; 2427 continue; 2428 } 2429 2430 Info.AllToInit.push_back(CXXBaseInit); 2431 } 2432 } 2433 2434 // Fields. 2435 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2436 MemEnd = ClassDecl->decls_end(); 2437 Mem != MemEnd; ++Mem) { 2438 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2439 if (F->getType()->isIncompleteArrayType()) { 2440 assert(ClassDecl->hasFlexibleArrayMember() && 2441 "Incomplete array type is not valid"); 2442 continue; 2443 } 2444 2445 // If we're not generating the implicit copy/move constructor, then we'll 2446 // handle anonymous struct/union fields based on their individual 2447 // indirect fields. 2448 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2449 continue; 2450 2451 if (CollectFieldInitializer(*this, Info, F)) 2452 HadError = true; 2453 continue; 2454 } 2455 2456 // Beyond this point, we only consider default initialization. 2457 if (Info.IIK != IIK_Default) 2458 continue; 2459 2460 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2461 if (F->getType()->isIncompleteArrayType()) { 2462 assert(ClassDecl->hasFlexibleArrayMember() && 2463 "Incomplete array type is not valid"); 2464 continue; 2465 } 2466 2467 // If this field is somewhere within an anonymous union, we only 2468 // initialize it if there's an explicit initializer. 2469 if (isWithinAnonymousUnion(F)) { 2470 if (CXXCtorInitializer *Init 2471 = Info.AllBaseFields.lookup(F->getAnonField())) { 2472 Info.AllToInit.push_back(Init); 2473 } 2474 2475 continue; 2476 } 2477 2478 // Initialize each field of an anonymous struct individually. 2479 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2480 HadError = true; 2481 2482 continue; 2483 } 2484 } 2485 2486 NumInitializers = Info.AllToInit.size(); 2487 if (NumInitializers > 0) { 2488 Constructor->setNumCtorInitializers(NumInitializers); 2489 CXXCtorInitializer **baseOrMemberInitializers = 2490 new (Context) CXXCtorInitializer*[NumInitializers]; 2491 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2492 NumInitializers * sizeof(CXXCtorInitializer*)); 2493 Constructor->setCtorInitializers(baseOrMemberInitializers); 2494 2495 // Constructors implicitly reference the base and member 2496 // destructors. 2497 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2498 Constructor->getParent()); 2499 } 2500 2501 return HadError; 2502} 2503 2504static void *GetKeyForTopLevelField(FieldDecl *Field) { 2505 // For anonymous unions, use the class declaration as the key. 2506 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2507 if (RT->getDecl()->isAnonymousStructOrUnion()) 2508 return static_cast<void *>(RT->getDecl()); 2509 } 2510 return static_cast<void *>(Field); 2511} 2512 2513static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2514 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2515} 2516 2517static void *GetKeyForMember(ASTContext &Context, 2518 CXXCtorInitializer *Member) { 2519 if (!Member->isAnyMemberInitializer()) 2520 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2521 2522 // For fields injected into the class via declaration of an anonymous union, 2523 // use its anonymous union class declaration as the unique key. 2524 FieldDecl *Field = Member->getAnyMember(); 2525 2526 // If the field is a member of an anonymous struct or union, our key 2527 // is the anonymous record decl that's a direct child of the class. 2528 RecordDecl *RD = Field->getParent(); 2529 if (RD->isAnonymousStructOrUnion()) { 2530 while (true) { 2531 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2532 if (Parent->isAnonymousStructOrUnion()) 2533 RD = Parent; 2534 else 2535 break; 2536 } 2537 2538 return static_cast<void *>(RD); 2539 } 2540 2541 return static_cast<void *>(Field); 2542} 2543 2544static void 2545DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2546 const CXXConstructorDecl *Constructor, 2547 CXXCtorInitializer **Inits, 2548 unsigned NumInits) { 2549 if (Constructor->getDeclContext()->isDependentContext()) 2550 return; 2551 2552 // Don't check initializers order unless the warning is enabled at the 2553 // location of at least one initializer. 2554 bool ShouldCheckOrder = false; 2555 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2556 CXXCtorInitializer *Init = Inits[InitIndex]; 2557 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2558 Init->getSourceLocation()) 2559 != Diagnostic::Ignored) { 2560 ShouldCheckOrder = true; 2561 break; 2562 } 2563 } 2564 if (!ShouldCheckOrder) 2565 return; 2566 2567 // Build the list of bases and members in the order that they'll 2568 // actually be initialized. The explicit initializers should be in 2569 // this same order but may be missing things. 2570 SmallVector<const void*, 32> IdealInitKeys; 2571 2572 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2573 2574 // 1. Virtual bases. 2575 for (CXXRecordDecl::base_class_const_iterator VBase = 2576 ClassDecl->vbases_begin(), 2577 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2578 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2579 2580 // 2. Non-virtual bases. 2581 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2582 E = ClassDecl->bases_end(); Base != E; ++Base) { 2583 if (Base->isVirtual()) 2584 continue; 2585 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2586 } 2587 2588 // 3. Direct fields. 2589 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2590 E = ClassDecl->field_end(); Field != E; ++Field) 2591 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2592 2593 unsigned NumIdealInits = IdealInitKeys.size(); 2594 unsigned IdealIndex = 0; 2595 2596 CXXCtorInitializer *PrevInit = 0; 2597 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2598 CXXCtorInitializer *Init = Inits[InitIndex]; 2599 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2600 2601 // Scan forward to try to find this initializer in the idealized 2602 // initializers list. 2603 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2604 if (InitKey == IdealInitKeys[IdealIndex]) 2605 break; 2606 2607 // If we didn't find this initializer, it must be because we 2608 // scanned past it on a previous iteration. That can only 2609 // happen if we're out of order; emit a warning. 2610 if (IdealIndex == NumIdealInits && PrevInit) { 2611 Sema::SemaDiagnosticBuilder D = 2612 SemaRef.Diag(PrevInit->getSourceLocation(), 2613 diag::warn_initializer_out_of_order); 2614 2615 if (PrevInit->isAnyMemberInitializer()) 2616 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2617 else 2618 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2619 2620 if (Init->isAnyMemberInitializer()) 2621 D << 0 << Init->getAnyMember()->getDeclName(); 2622 else 2623 D << 1 << Init->getBaseClassInfo()->getType(); 2624 2625 // Move back to the initializer's location in the ideal list. 2626 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2627 if (InitKey == IdealInitKeys[IdealIndex]) 2628 break; 2629 2630 assert(IdealIndex != NumIdealInits && 2631 "initializer not found in initializer list"); 2632 } 2633 2634 PrevInit = Init; 2635 } 2636} 2637 2638namespace { 2639bool CheckRedundantInit(Sema &S, 2640 CXXCtorInitializer *Init, 2641 CXXCtorInitializer *&PrevInit) { 2642 if (!PrevInit) { 2643 PrevInit = Init; 2644 return false; 2645 } 2646 2647 if (FieldDecl *Field = Init->getMember()) 2648 S.Diag(Init->getSourceLocation(), 2649 diag::err_multiple_mem_initialization) 2650 << Field->getDeclName() 2651 << Init->getSourceRange(); 2652 else { 2653 const Type *BaseClass = Init->getBaseClass(); 2654 assert(BaseClass && "neither field nor base"); 2655 S.Diag(Init->getSourceLocation(), 2656 diag::err_multiple_base_initialization) 2657 << QualType(BaseClass, 0) 2658 << Init->getSourceRange(); 2659 } 2660 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2661 << 0 << PrevInit->getSourceRange(); 2662 2663 return true; 2664} 2665 2666typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2667typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2668 2669bool CheckRedundantUnionInit(Sema &S, 2670 CXXCtorInitializer *Init, 2671 RedundantUnionMap &Unions) { 2672 FieldDecl *Field = Init->getAnyMember(); 2673 RecordDecl *Parent = Field->getParent(); 2674 if (!Parent->isAnonymousStructOrUnion()) 2675 return false; 2676 2677 NamedDecl *Child = Field; 2678 do { 2679 if (Parent->isUnion()) { 2680 UnionEntry &En = Unions[Parent]; 2681 if (En.first && En.first != Child) { 2682 S.Diag(Init->getSourceLocation(), 2683 diag::err_multiple_mem_union_initialization) 2684 << Field->getDeclName() 2685 << Init->getSourceRange(); 2686 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2687 << 0 << En.second->getSourceRange(); 2688 return true; 2689 } else if (!En.first) { 2690 En.first = Child; 2691 En.second = Init; 2692 } 2693 } 2694 2695 Child = Parent; 2696 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2697 } while (Parent->isAnonymousStructOrUnion()); 2698 2699 return false; 2700} 2701} 2702 2703/// ActOnMemInitializers - Handle the member initializers for a constructor. 2704void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2705 SourceLocation ColonLoc, 2706 CXXCtorInitializer **meminits, 2707 unsigned NumMemInits, 2708 bool AnyErrors) { 2709 if (!ConstructorDecl) 2710 return; 2711 2712 AdjustDeclIfTemplate(ConstructorDecl); 2713 2714 CXXConstructorDecl *Constructor 2715 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2716 2717 if (!Constructor) { 2718 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2719 return; 2720 } 2721 2722 CXXCtorInitializer **MemInits = 2723 reinterpret_cast<CXXCtorInitializer **>(meminits); 2724 2725 // Mapping for the duplicate initializers check. 2726 // For member initializers, this is keyed with a FieldDecl*. 2727 // For base initializers, this is keyed with a Type*. 2728 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2729 2730 // Mapping for the inconsistent anonymous-union initializers check. 2731 RedundantUnionMap MemberUnions; 2732 2733 bool HadError = false; 2734 for (unsigned i = 0; i < NumMemInits; i++) { 2735 CXXCtorInitializer *Init = MemInits[i]; 2736 2737 // Set the source order index. 2738 Init->setSourceOrder(i); 2739 2740 if (Init->isAnyMemberInitializer()) { 2741 FieldDecl *Field = Init->getAnyMember(); 2742 if (CheckRedundantInit(*this, Init, Members[Field]) || 2743 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2744 HadError = true; 2745 } else if (Init->isBaseInitializer()) { 2746 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2747 if (CheckRedundantInit(*this, Init, Members[Key])) 2748 HadError = true; 2749 } else { 2750 assert(Init->isDelegatingInitializer()); 2751 // This must be the only initializer 2752 if (i != 0 || NumMemInits > 1) { 2753 Diag(MemInits[0]->getSourceLocation(), 2754 diag::err_delegating_initializer_alone) 2755 << MemInits[0]->getSourceRange(); 2756 HadError = true; 2757 // We will treat this as being the only initializer. 2758 } 2759 SetDelegatingInitializer(Constructor, MemInits[i]); 2760 // Return immediately as the initializer is set. 2761 return; 2762 } 2763 } 2764 2765 if (HadError) 2766 return; 2767 2768 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2769 2770 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2771} 2772 2773void 2774Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2775 CXXRecordDecl *ClassDecl) { 2776 // Ignore dependent contexts. 2777 if (ClassDecl->isDependentContext()) 2778 return; 2779 2780 // FIXME: all the access-control diagnostics are positioned on the 2781 // field/base declaration. That's probably good; that said, the 2782 // user might reasonably want to know why the destructor is being 2783 // emitted, and we currently don't say. 2784 2785 // Non-static data members. 2786 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2787 E = ClassDecl->field_end(); I != E; ++I) { 2788 FieldDecl *Field = *I; 2789 if (Field->isInvalidDecl()) 2790 continue; 2791 QualType FieldType = Context.getBaseElementType(Field->getType()); 2792 2793 const RecordType* RT = FieldType->getAs<RecordType>(); 2794 if (!RT) 2795 continue; 2796 2797 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2798 if (FieldClassDecl->isInvalidDecl()) 2799 continue; 2800 if (FieldClassDecl->hasTrivialDestructor()) 2801 continue; 2802 2803 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2804 assert(Dtor && "No dtor found for FieldClassDecl!"); 2805 CheckDestructorAccess(Field->getLocation(), Dtor, 2806 PDiag(diag::err_access_dtor_field) 2807 << Field->getDeclName() 2808 << FieldType); 2809 2810 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2811 } 2812 2813 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2814 2815 // Bases. 2816 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2817 E = ClassDecl->bases_end(); Base != E; ++Base) { 2818 // Bases are always records in a well-formed non-dependent class. 2819 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2820 2821 // Remember direct virtual bases. 2822 if (Base->isVirtual()) 2823 DirectVirtualBases.insert(RT); 2824 2825 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2826 // If our base class is invalid, we probably can't get its dtor anyway. 2827 if (BaseClassDecl->isInvalidDecl()) 2828 continue; 2829 // Ignore trivial destructors. 2830 if (BaseClassDecl->hasTrivialDestructor()) 2831 continue; 2832 2833 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2834 assert(Dtor && "No dtor found for BaseClassDecl!"); 2835 2836 // FIXME: caret should be on the start of the class name 2837 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2838 PDiag(diag::err_access_dtor_base) 2839 << Base->getType() 2840 << Base->getSourceRange()); 2841 2842 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2843 } 2844 2845 // Virtual bases. 2846 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2847 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2848 2849 // Bases are always records in a well-formed non-dependent class. 2850 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2851 2852 // Ignore direct virtual bases. 2853 if (DirectVirtualBases.count(RT)) 2854 continue; 2855 2856 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2857 // If our base class is invalid, we probably can't get its dtor anyway. 2858 if (BaseClassDecl->isInvalidDecl()) 2859 continue; 2860 // Ignore trivial destructors. 2861 if (BaseClassDecl->hasTrivialDestructor()) 2862 continue; 2863 2864 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2865 assert(Dtor && "No dtor found for BaseClassDecl!"); 2866 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2867 PDiag(diag::err_access_dtor_vbase) 2868 << VBase->getType()); 2869 2870 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2871 } 2872} 2873 2874void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2875 if (!CDtorDecl) 2876 return; 2877 2878 if (CXXConstructorDecl *Constructor 2879 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2880 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2881} 2882 2883bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2884 unsigned DiagID, AbstractDiagSelID SelID) { 2885 if (SelID == -1) 2886 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2887 else 2888 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2889} 2890 2891bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2892 const PartialDiagnostic &PD) { 2893 if (!getLangOptions().CPlusPlus) 2894 return false; 2895 2896 if (const ArrayType *AT = Context.getAsArrayType(T)) 2897 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2898 2899 if (const PointerType *PT = T->getAs<PointerType>()) { 2900 // Find the innermost pointer type. 2901 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2902 PT = T; 2903 2904 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2905 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2906 } 2907 2908 const RecordType *RT = T->getAs<RecordType>(); 2909 if (!RT) 2910 return false; 2911 2912 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2913 2914 // We can't answer whether something is abstract until it has a 2915 // definition. If it's currently being defined, we'll walk back 2916 // over all the declarations when we have a full definition. 2917 const CXXRecordDecl *Def = RD->getDefinition(); 2918 if (!Def || Def->isBeingDefined()) 2919 return false; 2920 2921 if (!RD->isAbstract()) 2922 return false; 2923 2924 Diag(Loc, PD) << RD->getDeclName(); 2925 DiagnoseAbstractType(RD); 2926 2927 return true; 2928} 2929 2930void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2931 // Check if we've already emitted the list of pure virtual functions 2932 // for this class. 2933 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2934 return; 2935 2936 CXXFinalOverriderMap FinalOverriders; 2937 RD->getFinalOverriders(FinalOverriders); 2938 2939 // Keep a set of seen pure methods so we won't diagnose the same method 2940 // more than once. 2941 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2942 2943 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2944 MEnd = FinalOverriders.end(); 2945 M != MEnd; 2946 ++M) { 2947 for (OverridingMethods::iterator SO = M->second.begin(), 2948 SOEnd = M->second.end(); 2949 SO != SOEnd; ++SO) { 2950 // C++ [class.abstract]p4: 2951 // A class is abstract if it contains or inherits at least one 2952 // pure virtual function for which the final overrider is pure 2953 // virtual. 2954 2955 // 2956 if (SO->second.size() != 1) 2957 continue; 2958 2959 if (!SO->second.front().Method->isPure()) 2960 continue; 2961 2962 if (!SeenPureMethods.insert(SO->second.front().Method)) 2963 continue; 2964 2965 Diag(SO->second.front().Method->getLocation(), 2966 diag::note_pure_virtual_function) 2967 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2968 } 2969 } 2970 2971 if (!PureVirtualClassDiagSet) 2972 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2973 PureVirtualClassDiagSet->insert(RD); 2974} 2975 2976namespace { 2977struct AbstractUsageInfo { 2978 Sema &S; 2979 CXXRecordDecl *Record; 2980 CanQualType AbstractType; 2981 bool Invalid; 2982 2983 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2984 : S(S), Record(Record), 2985 AbstractType(S.Context.getCanonicalType( 2986 S.Context.getTypeDeclType(Record))), 2987 Invalid(false) {} 2988 2989 void DiagnoseAbstractType() { 2990 if (Invalid) return; 2991 S.DiagnoseAbstractType(Record); 2992 Invalid = true; 2993 } 2994 2995 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2996}; 2997 2998struct CheckAbstractUsage { 2999 AbstractUsageInfo &Info; 3000 const NamedDecl *Ctx; 3001 3002 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3003 : Info(Info), Ctx(Ctx) {} 3004 3005 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3006 switch (TL.getTypeLocClass()) { 3007#define ABSTRACT_TYPELOC(CLASS, PARENT) 3008#define TYPELOC(CLASS, PARENT) \ 3009 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3010#include "clang/AST/TypeLocNodes.def" 3011 } 3012 } 3013 3014 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3015 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3016 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3017 if (!TL.getArg(I)) 3018 continue; 3019 3020 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3021 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3022 } 3023 } 3024 3025 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3026 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3027 } 3028 3029 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3030 // Visit the type parameters from a permissive context. 3031 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3032 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3033 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3034 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3035 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3036 // TODO: other template argument types? 3037 } 3038 } 3039 3040 // Visit pointee types from a permissive context. 3041#define CheckPolymorphic(Type) \ 3042 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3043 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3044 } 3045 CheckPolymorphic(PointerTypeLoc) 3046 CheckPolymorphic(ReferenceTypeLoc) 3047 CheckPolymorphic(MemberPointerTypeLoc) 3048 CheckPolymorphic(BlockPointerTypeLoc) 3049 3050 /// Handle all the types we haven't given a more specific 3051 /// implementation for above. 3052 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3053 // Every other kind of type that we haven't called out already 3054 // that has an inner type is either (1) sugar or (2) contains that 3055 // inner type in some way as a subobject. 3056 if (TypeLoc Next = TL.getNextTypeLoc()) 3057 return Visit(Next, Sel); 3058 3059 // If there's no inner type and we're in a permissive context, 3060 // don't diagnose. 3061 if (Sel == Sema::AbstractNone) return; 3062 3063 // Check whether the type matches the abstract type. 3064 QualType T = TL.getType(); 3065 if (T->isArrayType()) { 3066 Sel = Sema::AbstractArrayType; 3067 T = Info.S.Context.getBaseElementType(T); 3068 } 3069 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3070 if (CT != Info.AbstractType) return; 3071 3072 // It matched; do some magic. 3073 if (Sel == Sema::AbstractArrayType) { 3074 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3075 << T << TL.getSourceRange(); 3076 } else { 3077 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3078 << Sel << T << TL.getSourceRange(); 3079 } 3080 Info.DiagnoseAbstractType(); 3081 } 3082}; 3083 3084void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3085 Sema::AbstractDiagSelID Sel) { 3086 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3087} 3088 3089} 3090 3091/// Check for invalid uses of an abstract type in a method declaration. 3092static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3093 CXXMethodDecl *MD) { 3094 // No need to do the check on definitions, which require that 3095 // the return/param types be complete. 3096 if (MD->doesThisDeclarationHaveABody()) 3097 return; 3098 3099 // For safety's sake, just ignore it if we don't have type source 3100 // information. This should never happen for non-implicit methods, 3101 // but... 3102 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3103 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3104} 3105 3106/// Check for invalid uses of an abstract type within a class definition. 3107static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3108 CXXRecordDecl *RD) { 3109 for (CXXRecordDecl::decl_iterator 3110 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3111 Decl *D = *I; 3112 if (D->isImplicit()) continue; 3113 3114 // Methods and method templates. 3115 if (isa<CXXMethodDecl>(D)) { 3116 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3117 } else if (isa<FunctionTemplateDecl>(D)) { 3118 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3119 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3120 3121 // Fields and static variables. 3122 } else if (isa<FieldDecl>(D)) { 3123 FieldDecl *FD = cast<FieldDecl>(D); 3124 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3125 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3126 } else if (isa<VarDecl>(D)) { 3127 VarDecl *VD = cast<VarDecl>(D); 3128 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3129 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3130 3131 // Nested classes and class templates. 3132 } else if (isa<CXXRecordDecl>(D)) { 3133 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3134 } else if (isa<ClassTemplateDecl>(D)) { 3135 CheckAbstractClassUsage(Info, 3136 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3137 } 3138 } 3139} 3140 3141/// \brief Perform semantic checks on a class definition that has been 3142/// completing, introducing implicitly-declared members, checking for 3143/// abstract types, etc. 3144void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3145 if (!Record) 3146 return; 3147 3148 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3149 AbstractUsageInfo Info(*this, Record); 3150 CheckAbstractClassUsage(Info, Record); 3151 } 3152 3153 // If this is not an aggregate type and has no user-declared constructor, 3154 // complain about any non-static data members of reference or const scalar 3155 // type, since they will never get initializers. 3156 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3157 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3158 bool Complained = false; 3159 for (RecordDecl::field_iterator F = Record->field_begin(), 3160 FEnd = Record->field_end(); 3161 F != FEnd; ++F) { 3162 if (F->hasInClassInitializer()) 3163 continue; 3164 3165 if (F->getType()->isReferenceType() || 3166 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3167 if (!Complained) { 3168 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3169 << Record->getTagKind() << Record; 3170 Complained = true; 3171 } 3172 3173 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3174 << F->getType()->isReferenceType() 3175 << F->getDeclName(); 3176 } 3177 } 3178 } 3179 3180 if (Record->isDynamicClass() && !Record->isDependentType()) 3181 DynamicClasses.push_back(Record); 3182 3183 if (Record->getIdentifier()) { 3184 // C++ [class.mem]p13: 3185 // If T is the name of a class, then each of the following shall have a 3186 // name different from T: 3187 // - every member of every anonymous union that is a member of class T. 3188 // 3189 // C++ [class.mem]p14: 3190 // In addition, if class T has a user-declared constructor (12.1), every 3191 // non-static data member of class T shall have a name different from T. 3192 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3193 R.first != R.second; ++R.first) { 3194 NamedDecl *D = *R.first; 3195 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3196 isa<IndirectFieldDecl>(D)) { 3197 Diag(D->getLocation(), diag::err_member_name_of_class) 3198 << D->getDeclName(); 3199 break; 3200 } 3201 } 3202 } 3203 3204 // Warn if the class has virtual methods but non-virtual public destructor. 3205 if (Record->isPolymorphic() && !Record->isDependentType()) { 3206 CXXDestructorDecl *dtor = Record->getDestructor(); 3207 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3208 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3209 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3210 } 3211 3212 // See if a method overloads virtual methods in a base 3213 /// class without overriding any. 3214 if (!Record->isDependentType()) { 3215 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3216 MEnd = Record->method_end(); 3217 M != MEnd; ++M) { 3218 if (!(*M)->isStatic()) 3219 DiagnoseHiddenVirtualMethods(Record, *M); 3220 } 3221 } 3222 3223 // Declare inherited constructors. We do this eagerly here because: 3224 // - The standard requires an eager diagnostic for conflicting inherited 3225 // constructors from different classes. 3226 // - The lazy declaration of the other implicit constructors is so as to not 3227 // waste space and performance on classes that are not meant to be 3228 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3229 // have inherited constructors. 3230 DeclareInheritedConstructors(Record); 3231 3232 if (!Record->isDependentType()) 3233 CheckExplicitlyDefaultedMethods(Record); 3234} 3235 3236void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3237 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3238 ME = Record->method_end(); 3239 MI != ME; ++MI) { 3240 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3241 switch (getSpecialMember(*MI)) { 3242 case CXXDefaultConstructor: 3243 CheckExplicitlyDefaultedDefaultConstructor( 3244 cast<CXXConstructorDecl>(*MI)); 3245 break; 3246 3247 case CXXDestructor: 3248 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3249 break; 3250 3251 case CXXCopyConstructor: 3252 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3253 break; 3254 3255 case CXXCopyAssignment: 3256 CheckExplicitlyDefaultedCopyAssignment(*MI); 3257 break; 3258 3259 case CXXMoveConstructor: 3260 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3261 break; 3262 3263 case CXXMoveAssignment: 3264 CheckExplicitlyDefaultedMoveAssignment(*MI); 3265 break; 3266 3267 case CXXInvalid: 3268 llvm_unreachable("non-special member explicitly defaulted!"); 3269 } 3270 } 3271 } 3272 3273} 3274 3275void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3276 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3277 3278 // Whether this was the first-declared instance of the constructor. 3279 // This affects whether we implicitly add an exception spec (and, eventually, 3280 // constexpr). It is also ill-formed to explicitly default a constructor such 3281 // that it would be deleted. (C++0x [decl.fct.def.default]) 3282 bool First = CD == CD->getCanonicalDecl(); 3283 3284 bool HadError = false; 3285 if (CD->getNumParams() != 0) { 3286 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3287 << CD->getSourceRange(); 3288 HadError = true; 3289 } 3290 3291 ImplicitExceptionSpecification Spec 3292 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3293 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3294 if (EPI.ExceptionSpecType == EST_Delayed) { 3295 // Exception specification depends on some deferred part of the class. We'll 3296 // try again when the class's definition has been fully processed. 3297 return; 3298 } 3299 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3300 *ExceptionType = Context.getFunctionType( 3301 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3302 3303 if (CtorType->hasExceptionSpec()) { 3304 if (CheckEquivalentExceptionSpec( 3305 PDiag(diag::err_incorrect_defaulted_exception_spec) 3306 << CXXDefaultConstructor, 3307 PDiag(), 3308 ExceptionType, SourceLocation(), 3309 CtorType, CD->getLocation())) { 3310 HadError = true; 3311 } 3312 } else if (First) { 3313 // We set the declaration to have the computed exception spec here. 3314 // We know there are no parameters. 3315 EPI.ExtInfo = CtorType->getExtInfo(); 3316 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3317 } 3318 3319 if (HadError) { 3320 CD->setInvalidDecl(); 3321 return; 3322 } 3323 3324 if (ShouldDeleteDefaultConstructor(CD)) { 3325 if (First) { 3326 CD->setDeletedAsWritten(); 3327 } else { 3328 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3329 << CXXDefaultConstructor; 3330 CD->setInvalidDecl(); 3331 } 3332 } 3333} 3334 3335void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3336 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3337 3338 // Whether this was the first-declared instance of the constructor. 3339 bool First = CD == CD->getCanonicalDecl(); 3340 3341 bool HadError = false; 3342 if (CD->getNumParams() != 1) { 3343 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3344 << CD->getSourceRange(); 3345 HadError = true; 3346 } 3347 3348 ImplicitExceptionSpecification Spec(Context); 3349 bool Const; 3350 llvm::tie(Spec, Const) = 3351 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3352 3353 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3354 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3355 *ExceptionType = Context.getFunctionType( 3356 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3357 3358 // Check for parameter type matching. 3359 // This is a copy ctor so we know it's a cv-qualified reference to T. 3360 QualType ArgType = CtorType->getArgType(0); 3361 if (ArgType->getPointeeType().isVolatileQualified()) { 3362 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3363 HadError = true; 3364 } 3365 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3366 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3367 HadError = true; 3368 } 3369 3370 if (CtorType->hasExceptionSpec()) { 3371 if (CheckEquivalentExceptionSpec( 3372 PDiag(diag::err_incorrect_defaulted_exception_spec) 3373 << CXXCopyConstructor, 3374 PDiag(), 3375 ExceptionType, SourceLocation(), 3376 CtorType, CD->getLocation())) { 3377 HadError = true; 3378 } 3379 } else if (First) { 3380 // We set the declaration to have the computed exception spec here. 3381 // We duplicate the one parameter type. 3382 EPI.ExtInfo = CtorType->getExtInfo(); 3383 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3384 } 3385 3386 if (HadError) { 3387 CD->setInvalidDecl(); 3388 return; 3389 } 3390 3391 if (ShouldDeleteCopyConstructor(CD)) { 3392 if (First) { 3393 CD->setDeletedAsWritten(); 3394 } else { 3395 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3396 << CXXCopyConstructor; 3397 CD->setInvalidDecl(); 3398 } 3399 } 3400} 3401 3402void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3403 assert(MD->isExplicitlyDefaulted()); 3404 3405 // Whether this was the first-declared instance of the operator 3406 bool First = MD == MD->getCanonicalDecl(); 3407 3408 bool HadError = false; 3409 if (MD->getNumParams() != 1) { 3410 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3411 << MD->getSourceRange(); 3412 HadError = true; 3413 } 3414 3415 QualType ReturnType = 3416 MD->getType()->getAs<FunctionType>()->getResultType(); 3417 if (!ReturnType->isLValueReferenceType() || 3418 !Context.hasSameType( 3419 Context.getCanonicalType(ReturnType->getPointeeType()), 3420 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3421 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3422 HadError = true; 3423 } 3424 3425 ImplicitExceptionSpecification Spec(Context); 3426 bool Const; 3427 llvm::tie(Spec, Const) = 3428 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3429 3430 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3431 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3432 *ExceptionType = Context.getFunctionType( 3433 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3434 3435 QualType ArgType = OperType->getArgType(0); 3436 if (!ArgType->isLValueReferenceType()) { 3437 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3438 HadError = true; 3439 } else { 3440 if (ArgType->getPointeeType().isVolatileQualified()) { 3441 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3442 HadError = true; 3443 } 3444 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3445 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3446 HadError = true; 3447 } 3448 } 3449 3450 if (OperType->getTypeQuals()) { 3451 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3452 HadError = true; 3453 } 3454 3455 if (OperType->hasExceptionSpec()) { 3456 if (CheckEquivalentExceptionSpec( 3457 PDiag(diag::err_incorrect_defaulted_exception_spec) 3458 << CXXCopyAssignment, 3459 PDiag(), 3460 ExceptionType, SourceLocation(), 3461 OperType, MD->getLocation())) { 3462 HadError = true; 3463 } 3464 } else if (First) { 3465 // We set the declaration to have the computed exception spec here. 3466 // We duplicate the one parameter type. 3467 EPI.RefQualifier = OperType->getRefQualifier(); 3468 EPI.ExtInfo = OperType->getExtInfo(); 3469 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3470 } 3471 3472 if (HadError) { 3473 MD->setInvalidDecl(); 3474 return; 3475 } 3476 3477 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3478 if (First) { 3479 MD->setDeletedAsWritten(); 3480 } else { 3481 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3482 << CXXCopyAssignment; 3483 MD->setInvalidDecl(); 3484 } 3485 } 3486} 3487 3488void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 3489 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 3490 3491 // Whether this was the first-declared instance of the constructor. 3492 bool First = CD == CD->getCanonicalDecl(); 3493 3494 bool HadError = false; 3495 if (CD->getNumParams() != 1) { 3496 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 3497 << CD->getSourceRange(); 3498 HadError = true; 3499 } 3500 3501 ImplicitExceptionSpecification Spec( 3502 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 3503 3504 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3505 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3506 *ExceptionType = Context.getFunctionType( 3507 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3508 3509 // Check for parameter type matching. 3510 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 3511 QualType ArgType = CtorType->getArgType(0); 3512 if (ArgType->getPointeeType().isVolatileQualified()) { 3513 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 3514 HadError = true; 3515 } 3516 if (ArgType->getPointeeType().isConstQualified()) { 3517 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 3518 HadError = true; 3519 } 3520 3521 if (CtorType->hasExceptionSpec()) { 3522 if (CheckEquivalentExceptionSpec( 3523 PDiag(diag::err_incorrect_defaulted_exception_spec) 3524 << CXXMoveConstructor, 3525 PDiag(), 3526 ExceptionType, SourceLocation(), 3527 CtorType, CD->getLocation())) { 3528 HadError = true; 3529 } 3530 } else if (First) { 3531 // We set the declaration to have the computed exception spec here. 3532 // We duplicate the one parameter type. 3533 EPI.ExtInfo = CtorType->getExtInfo(); 3534 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3535 } 3536 3537 if (HadError) { 3538 CD->setInvalidDecl(); 3539 return; 3540 } 3541 3542 if (ShouldDeleteMoveConstructor(CD)) { 3543 if (First) { 3544 CD->setDeletedAsWritten(); 3545 } else { 3546 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3547 << CXXMoveConstructor; 3548 CD->setInvalidDecl(); 3549 } 3550 } 3551} 3552 3553void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 3554 assert(MD->isExplicitlyDefaulted()); 3555 3556 // Whether this was the first-declared instance of the operator 3557 bool First = MD == MD->getCanonicalDecl(); 3558 3559 bool HadError = false; 3560 if (MD->getNumParams() != 1) { 3561 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 3562 << MD->getSourceRange(); 3563 HadError = true; 3564 } 3565 3566 QualType ReturnType = 3567 MD->getType()->getAs<FunctionType>()->getResultType(); 3568 if (!ReturnType->isLValueReferenceType() || 3569 !Context.hasSameType( 3570 Context.getCanonicalType(ReturnType->getPointeeType()), 3571 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3572 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 3573 HadError = true; 3574 } 3575 3576 ImplicitExceptionSpecification Spec( 3577 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 3578 3579 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3580 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3581 *ExceptionType = Context.getFunctionType( 3582 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3583 3584 QualType ArgType = OperType->getArgType(0); 3585 if (!ArgType->isRValueReferenceType()) { 3586 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 3587 HadError = true; 3588 } else { 3589 if (ArgType->getPointeeType().isVolatileQualified()) { 3590 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 3591 HadError = true; 3592 } 3593 if (ArgType->getPointeeType().isConstQualified()) { 3594 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 3595 HadError = true; 3596 } 3597 } 3598 3599 if (OperType->getTypeQuals()) { 3600 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 3601 HadError = true; 3602 } 3603 3604 if (OperType->hasExceptionSpec()) { 3605 if (CheckEquivalentExceptionSpec( 3606 PDiag(diag::err_incorrect_defaulted_exception_spec) 3607 << CXXMoveAssignment, 3608 PDiag(), 3609 ExceptionType, SourceLocation(), 3610 OperType, MD->getLocation())) { 3611 HadError = true; 3612 } 3613 } else if (First) { 3614 // We set the declaration to have the computed exception spec here. 3615 // We duplicate the one parameter type. 3616 EPI.RefQualifier = OperType->getRefQualifier(); 3617 EPI.ExtInfo = OperType->getExtInfo(); 3618 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3619 } 3620 3621 if (HadError) { 3622 MD->setInvalidDecl(); 3623 return; 3624 } 3625 3626 if (ShouldDeleteMoveAssignmentOperator(MD)) { 3627 if (First) { 3628 MD->setDeletedAsWritten(); 3629 } else { 3630 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3631 << CXXMoveAssignment; 3632 MD->setInvalidDecl(); 3633 } 3634 } 3635} 3636 3637void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 3638 assert(DD->isExplicitlyDefaulted()); 3639 3640 // Whether this was the first-declared instance of the destructor. 3641 bool First = DD == DD->getCanonicalDecl(); 3642 3643 ImplicitExceptionSpecification Spec 3644 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 3645 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3646 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 3647 *ExceptionType = Context.getFunctionType( 3648 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3649 3650 if (DtorType->hasExceptionSpec()) { 3651 if (CheckEquivalentExceptionSpec( 3652 PDiag(diag::err_incorrect_defaulted_exception_spec) 3653 << CXXDestructor, 3654 PDiag(), 3655 ExceptionType, SourceLocation(), 3656 DtorType, DD->getLocation())) { 3657 DD->setInvalidDecl(); 3658 return; 3659 } 3660 } else if (First) { 3661 // We set the declaration to have the computed exception spec here. 3662 // There are no parameters. 3663 EPI.ExtInfo = DtorType->getExtInfo(); 3664 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3665 } 3666 3667 if (ShouldDeleteDestructor(DD)) { 3668 if (First) { 3669 DD->setDeletedAsWritten(); 3670 } else { 3671 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 3672 << CXXDestructor; 3673 DD->setInvalidDecl(); 3674 } 3675 } 3676} 3677 3678bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3679 CXXRecordDecl *RD = CD->getParent(); 3680 assert(!RD->isDependentType() && "do deletion after instantiation"); 3681 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3682 return false; 3683 3684 SourceLocation Loc = CD->getLocation(); 3685 3686 // Do access control from the constructor 3687 ContextRAII CtorContext(*this, CD); 3688 3689 bool Union = RD->isUnion(); 3690 bool AllConst = true; 3691 3692 // We do this because we should never actually use an anonymous 3693 // union's constructor. 3694 if (Union && RD->isAnonymousStructOrUnion()) 3695 return false; 3696 3697 // FIXME: We should put some diagnostic logic right into this function. 3698 3699 // C++0x [class.ctor]/5 3700 // A defaulted default constructor for class X is defined as deleted if: 3701 3702 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3703 BE = RD->bases_end(); 3704 BI != BE; ++BI) { 3705 // We'll handle this one later 3706 if (BI->isVirtual()) 3707 continue; 3708 3709 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3710 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3711 3712 // -- any [direct base class] has a type with a destructor that is 3713 // deleted or inaccessible from the defaulted default constructor 3714 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3715 if (BaseDtor->isDeleted()) 3716 return true; 3717 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3718 AR_accessible) 3719 return true; 3720 3721 // -- any [direct base class either] has no default constructor or 3722 // overload resolution as applied to [its] default constructor 3723 // results in an ambiguity or in a function that is deleted or 3724 // inaccessible from the defaulted default constructor 3725 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3726 if (!BaseDefault || BaseDefault->isDeleted()) 3727 return true; 3728 3729 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3730 PDiag()) != AR_accessible) 3731 return true; 3732 } 3733 3734 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3735 BE = RD->vbases_end(); 3736 BI != BE; ++BI) { 3737 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3738 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3739 3740 // -- any [virtual base class] has a type with a destructor that is 3741 // delete or inaccessible from the defaulted default constructor 3742 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3743 if (BaseDtor->isDeleted()) 3744 return true; 3745 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3746 AR_accessible) 3747 return true; 3748 3749 // -- any [virtual base class either] has no default constructor or 3750 // overload resolution as applied to [its] default constructor 3751 // results in an ambiguity or in a function that is deleted or 3752 // inaccessible from the defaulted default constructor 3753 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3754 if (!BaseDefault || BaseDefault->isDeleted()) 3755 return true; 3756 3757 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3758 PDiag()) != AR_accessible) 3759 return true; 3760 } 3761 3762 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3763 FE = RD->field_end(); 3764 FI != FE; ++FI) { 3765 if (FI->isInvalidDecl()) 3766 continue; 3767 3768 QualType FieldType = Context.getBaseElementType(FI->getType()); 3769 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3770 3771 // -- any non-static data member with no brace-or-equal-initializer is of 3772 // reference type 3773 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 3774 return true; 3775 3776 // -- X is a union and all its variant members are of const-qualified type 3777 // (or array thereof) 3778 if (Union && !FieldType.isConstQualified()) 3779 AllConst = false; 3780 3781 if (FieldRecord) { 3782 // -- X is a union-like class that has a variant member with a non-trivial 3783 // default constructor 3784 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3785 return true; 3786 3787 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3788 if (FieldDtor->isDeleted()) 3789 return true; 3790 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3791 AR_accessible) 3792 return true; 3793 3794 // -- any non-variant non-static data member of const-qualified type (or 3795 // array thereof) with no brace-or-equal-initializer does not have a 3796 // user-provided default constructor 3797 if (FieldType.isConstQualified() && 3798 !FI->hasInClassInitializer() && 3799 !FieldRecord->hasUserProvidedDefaultConstructor()) 3800 return true; 3801 3802 if (!Union && FieldRecord->isUnion() && 3803 FieldRecord->isAnonymousStructOrUnion()) { 3804 // We're okay to reuse AllConst here since we only care about the 3805 // value otherwise if we're in a union. 3806 AllConst = true; 3807 3808 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3809 UE = FieldRecord->field_end(); 3810 UI != UE; ++UI) { 3811 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3812 CXXRecordDecl *UnionFieldRecord = 3813 UnionFieldType->getAsCXXRecordDecl(); 3814 3815 if (!UnionFieldType.isConstQualified()) 3816 AllConst = false; 3817 3818 if (UnionFieldRecord && 3819 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3820 return true; 3821 } 3822 3823 if (AllConst) 3824 return true; 3825 3826 // Don't try to initialize the anonymous union 3827 // This is technically non-conformant, but sanity demands it. 3828 continue; 3829 } 3830 3831 // -- any non-static data member with no brace-or-equal-initializer has 3832 // class type M (or array thereof) and either M has no default 3833 // constructor or overload resolution as applied to M's default 3834 // constructor results in an ambiguity or in a function that is deleted 3835 // or inaccessible from the defaulted default constructor. 3836 if (!FI->hasInClassInitializer()) { 3837 CXXConstructorDecl *FieldDefault = LookupDefaultConstructor(FieldRecord); 3838 if (!FieldDefault || FieldDefault->isDeleted()) 3839 return true; 3840 if (CheckConstructorAccess(Loc, FieldDefault, FieldDefault->getAccess(), 3841 PDiag()) != AR_accessible) 3842 return true; 3843 } 3844 } else if (!Union && FieldType.isConstQualified() && 3845 !FI->hasInClassInitializer()) { 3846 // -- any non-variant non-static data member of const-qualified type (or 3847 // array thereof) with no brace-or-equal-initializer does not have a 3848 // user-provided default constructor 3849 return true; 3850 } 3851 } 3852 3853 if (Union && AllConst) 3854 return true; 3855 3856 return false; 3857} 3858 3859bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 3860 CXXRecordDecl *RD = CD->getParent(); 3861 assert(!RD->isDependentType() && "do deletion after instantiation"); 3862 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3863 return false; 3864 3865 SourceLocation Loc = CD->getLocation(); 3866 3867 // Do access control from the constructor 3868 ContextRAII CtorContext(*this, CD); 3869 3870 bool Union = RD->isUnion(); 3871 3872 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 3873 "copy assignment arg has no pointee type"); 3874 unsigned ArgQuals = 3875 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 3876 Qualifiers::Const : 0; 3877 3878 // We do this because we should never actually use an anonymous 3879 // union's constructor. 3880 if (Union && RD->isAnonymousStructOrUnion()) 3881 return false; 3882 3883 // FIXME: We should put some diagnostic logic right into this function. 3884 3885 // C++0x [class.copy]/11 3886 // A defaulted [copy] constructor for class X is defined as delete if X has: 3887 3888 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3889 BE = RD->bases_end(); 3890 BI != BE; ++BI) { 3891 // We'll handle this one later 3892 if (BI->isVirtual()) 3893 continue; 3894 3895 QualType BaseType = BI->getType(); 3896 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3897 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3898 3899 // -- any [direct base class] of a type with a destructor that is deleted or 3900 // inaccessible from the defaulted constructor 3901 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3902 if (BaseDtor->isDeleted()) 3903 return true; 3904 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3905 AR_accessible) 3906 return true; 3907 3908 // -- a [direct base class] B that cannot be [copied] because overload 3909 // resolution, as applied to B's [copy] constructor, results in an 3910 // ambiguity or a function that is deleted or inaccessible from the 3911 // defaulted constructor 3912 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3913 if (!BaseCtor || BaseCtor->isDeleted()) 3914 return true; 3915 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3916 AR_accessible) 3917 return true; 3918 } 3919 3920 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3921 BE = RD->vbases_end(); 3922 BI != BE; ++BI) { 3923 QualType BaseType = BI->getType(); 3924 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3925 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3926 3927 // -- any [virtual base class] of a type with a destructor that is deleted or 3928 // inaccessible from the defaulted constructor 3929 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3930 if (BaseDtor->isDeleted()) 3931 return true; 3932 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3933 AR_accessible) 3934 return true; 3935 3936 // -- a [virtual base class] B that cannot be [copied] because overload 3937 // resolution, as applied to B's [copy] constructor, results in an 3938 // ambiguity or a function that is deleted or inaccessible from the 3939 // defaulted constructor 3940 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3941 if (!BaseCtor || BaseCtor->isDeleted()) 3942 return true; 3943 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3944 AR_accessible) 3945 return true; 3946 } 3947 3948 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3949 FE = RD->field_end(); 3950 FI != FE; ++FI) { 3951 QualType FieldType = Context.getBaseElementType(FI->getType()); 3952 3953 // -- for a copy constructor, a non-static data member of rvalue reference 3954 // type 3955 if (FieldType->isRValueReferenceType()) 3956 return true; 3957 3958 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3959 3960 if (FieldRecord) { 3961 // This is an anonymous union 3962 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3963 // Anonymous unions inside unions do not variant members create 3964 if (!Union) { 3965 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3966 UE = FieldRecord->field_end(); 3967 UI != UE; ++UI) { 3968 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3969 CXXRecordDecl *UnionFieldRecord = 3970 UnionFieldType->getAsCXXRecordDecl(); 3971 3972 // -- a variant member with a non-trivial [copy] constructor and X 3973 // is a union-like class 3974 if (UnionFieldRecord && 3975 !UnionFieldRecord->hasTrivialCopyConstructor()) 3976 return true; 3977 } 3978 } 3979 3980 // Don't try to initalize an anonymous union 3981 continue; 3982 } else { 3983 // -- a variant member with a non-trivial [copy] constructor and X is a 3984 // union-like class 3985 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 3986 return true; 3987 3988 // -- any [non-static data member] of a type with a destructor that is 3989 // deleted or inaccessible from the defaulted constructor 3990 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3991 if (FieldDtor->isDeleted()) 3992 return true; 3993 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3994 AR_accessible) 3995 return true; 3996 } 3997 3998 // -- a [non-static data member of class type (or array thereof)] B that 3999 // cannot be [copied] because overload resolution, as applied to B's 4000 // [copy] constructor, results in an ambiguity or a function that is 4001 // deleted or inaccessible from the defaulted constructor 4002 CXXConstructorDecl *FieldCtor = LookupCopyingConstructor(FieldRecord, 4003 ArgQuals); 4004 if (!FieldCtor || FieldCtor->isDeleted()) 4005 return true; 4006 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4007 PDiag()) != AR_accessible) 4008 return true; 4009 } 4010 } 4011 4012 return false; 4013} 4014 4015bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4016 CXXRecordDecl *RD = MD->getParent(); 4017 assert(!RD->isDependentType() && "do deletion after instantiation"); 4018 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4019 return false; 4020 4021 SourceLocation Loc = MD->getLocation(); 4022 4023 // Do access control from the constructor 4024 ContextRAII MethodContext(*this, MD); 4025 4026 bool Union = RD->isUnion(); 4027 4028 unsigned ArgQuals = 4029 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4030 Qualifiers::Const : 0; 4031 4032 // We do this because we should never actually use an anonymous 4033 // union's constructor. 4034 if (Union && RD->isAnonymousStructOrUnion()) 4035 return false; 4036 4037 // FIXME: We should put some diagnostic logic right into this function. 4038 4039 // C++0x [class.copy]/20 4040 // A defaulted [copy] assignment operator for class X is defined as deleted 4041 // if X has: 4042 4043 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4044 BE = RD->bases_end(); 4045 BI != BE; ++BI) { 4046 // We'll handle this one later 4047 if (BI->isVirtual()) 4048 continue; 4049 4050 QualType BaseType = BI->getType(); 4051 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4052 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4053 4054 // -- a [direct base class] B that cannot be [copied] because overload 4055 // resolution, as applied to B's [copy] assignment operator, results in 4056 // an ambiguity or a function that is deleted or inaccessible from the 4057 // assignment operator 4058 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4059 0); 4060 if (!CopyOper || CopyOper->isDeleted()) 4061 return true; 4062 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4063 return true; 4064 } 4065 4066 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4067 BE = RD->vbases_end(); 4068 BI != BE; ++BI) { 4069 QualType BaseType = BI->getType(); 4070 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4071 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4072 4073 // -- a [virtual base class] B that cannot be [copied] because overload 4074 // resolution, as applied to B's [copy] assignment operator, results in 4075 // an ambiguity or a function that is deleted or inaccessible from the 4076 // assignment operator 4077 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4078 0); 4079 if (!CopyOper || CopyOper->isDeleted()) 4080 return true; 4081 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4082 return true; 4083 } 4084 4085 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4086 FE = RD->field_end(); 4087 FI != FE; ++FI) { 4088 QualType FieldType = Context.getBaseElementType(FI->getType()); 4089 4090 // -- a non-static data member of reference type 4091 if (FieldType->isReferenceType()) 4092 return true; 4093 4094 // -- a non-static data member of const non-class type (or array thereof) 4095 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4096 return true; 4097 4098 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4099 4100 if (FieldRecord) { 4101 // This is an anonymous union 4102 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4103 // Anonymous unions inside unions do not variant members create 4104 if (!Union) { 4105 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4106 UE = FieldRecord->field_end(); 4107 UI != UE; ++UI) { 4108 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4109 CXXRecordDecl *UnionFieldRecord = 4110 UnionFieldType->getAsCXXRecordDecl(); 4111 4112 // -- a variant member with a non-trivial [copy] assignment operator 4113 // and X is a union-like class 4114 if (UnionFieldRecord && 4115 !UnionFieldRecord->hasTrivialCopyAssignment()) 4116 return true; 4117 } 4118 } 4119 4120 // Don't try to initalize an anonymous union 4121 continue; 4122 // -- a variant member with a non-trivial [copy] assignment operator 4123 // and X is a union-like class 4124 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4125 return true; 4126 } 4127 4128 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4129 false, 0); 4130 if (!CopyOper || CopyOper->isDeleted()) 4131 return true; 4132 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4133 return true; 4134 } 4135 } 4136 4137 return false; 4138} 4139 4140bool Sema::ShouldDeleteMoveConstructor(CXXConstructorDecl *CD) { 4141 CXXRecordDecl *RD = CD->getParent(); 4142 assert(!RD->isDependentType() && "do deletion after instantiation"); 4143 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4144 return false; 4145 4146 SourceLocation Loc = CD->getLocation(); 4147 4148 // Do access control from the constructor 4149 ContextRAII CtorContext(*this, CD); 4150 4151 bool Union = RD->isUnion(); 4152 4153 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 4154 "copy assignment arg has no pointee type"); 4155 4156 // We do this because we should never actually use an anonymous 4157 // union's constructor. 4158 if (Union && RD->isAnonymousStructOrUnion()) 4159 return false; 4160 4161 // C++0x [class.copy]/11 4162 // A defaulted [move] constructor for class X is defined as deleted 4163 // if X has: 4164 4165 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4166 BE = RD->bases_end(); 4167 BI != BE; ++BI) { 4168 // We'll handle this one later 4169 if (BI->isVirtual()) 4170 continue; 4171 4172 QualType BaseType = BI->getType(); 4173 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4174 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4175 4176 // -- any [direct base class] of a type with a destructor that is deleted or 4177 // inaccessible from the defaulted constructor 4178 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4179 if (BaseDtor->isDeleted()) 4180 return true; 4181 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4182 AR_accessible) 4183 return true; 4184 4185 // -- a [direct base class] B that cannot be [moved] because overload 4186 // resolution, as applied to B's [move] constructor, results in an 4187 // ambiguity or a function that is deleted or inaccessible from the 4188 // defaulted constructor 4189 CXXConstructorDecl *BaseCtor = LookupMovingConstructor(BaseDecl); 4190 if (!BaseCtor || BaseCtor->isDeleted()) 4191 return true; 4192 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4193 AR_accessible) 4194 return true; 4195 4196 // -- for a move constructor, a [direct base class] with a type that 4197 // does not have a move constructor and is not trivially copyable. 4198 // If the field isn't a record, it's always trivially copyable. 4199 // A moving constructor could be a copy constructor instead. 4200 if (!BaseCtor->isMoveConstructor() && 4201 !BaseDecl->isTriviallyCopyable()) 4202 return true; 4203 } 4204 4205 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4206 BE = RD->vbases_end(); 4207 BI != BE; ++BI) { 4208 QualType BaseType = BI->getType(); 4209 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4210 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4211 4212 // -- any [virtual base class] of a type with a destructor that is deleted 4213 // or inaccessible from the defaulted constructor 4214 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4215 if (BaseDtor->isDeleted()) 4216 return true; 4217 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4218 AR_accessible) 4219 return true; 4220 4221 // -- a [virtual base class] B that cannot be [moved] because overload 4222 // resolution, as applied to B's [move] constructor, results in an 4223 // ambiguity or a function that is deleted or inaccessible from the 4224 // defaulted constructor 4225 CXXConstructorDecl *BaseCtor = LookupMovingConstructor(BaseDecl); 4226 if (!BaseCtor || BaseCtor->isDeleted()) 4227 return true; 4228 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4229 AR_accessible) 4230 return true; 4231 4232 // -- for a move constructor, a [virtual base class] with a type that 4233 // does not have a move constructor and is not trivially copyable. 4234 // If the field isn't a record, it's always trivially copyable. 4235 // A moving constructor could be a copy constructor instead. 4236 if (!BaseCtor->isMoveConstructor() && 4237 !BaseDecl->isTriviallyCopyable()) 4238 return true; 4239 } 4240 4241 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4242 FE = RD->field_end(); 4243 FI != FE; ++FI) { 4244 QualType FieldType = Context.getBaseElementType(FI->getType()); 4245 4246 if (CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl()) { 4247 // This is an anonymous union 4248 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4249 // Anonymous unions inside unions do not variant members create 4250 if (!Union) { 4251 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4252 UE = FieldRecord->field_end(); 4253 UI != UE; ++UI) { 4254 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4255 CXXRecordDecl *UnionFieldRecord = 4256 UnionFieldType->getAsCXXRecordDecl(); 4257 4258 // -- a variant member with a non-trivial [move] constructor and X 4259 // is a union-like class 4260 if (UnionFieldRecord && 4261 !UnionFieldRecord->hasTrivialMoveConstructor()) 4262 return true; 4263 } 4264 } 4265 4266 // Don't try to initalize an anonymous union 4267 continue; 4268 } else { 4269 // -- a variant member with a non-trivial [move] constructor and X is a 4270 // union-like class 4271 if (Union && !FieldRecord->hasTrivialMoveConstructor()) 4272 return true; 4273 4274 // -- any [non-static data member] of a type with a destructor that is 4275 // deleted or inaccessible from the defaulted constructor 4276 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4277 if (FieldDtor->isDeleted()) 4278 return true; 4279 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4280 AR_accessible) 4281 return true; 4282 } 4283 4284 // -- a [non-static data member of class type (or array thereof)] B that 4285 // cannot be [moved] because overload resolution, as applied to B's 4286 // [move] constructor, results in an ambiguity or a function that is 4287 // deleted or inaccessible from the defaulted constructor 4288 CXXConstructorDecl *FieldCtor = LookupMovingConstructor(FieldRecord); 4289 if (!FieldCtor || FieldCtor->isDeleted()) 4290 return true; 4291 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4292 PDiag()) != AR_accessible) 4293 return true; 4294 4295 // -- for a move constructor, a [non-static data member] with a type that 4296 // does not have a move constructor and is not trivially copyable. 4297 // If the field isn't a record, it's always trivially copyable. 4298 // A moving constructor could be a copy constructor instead. 4299 if (!FieldCtor->isMoveConstructor() && 4300 !FieldRecord->isTriviallyCopyable()) 4301 return true; 4302 } 4303 } 4304 4305 return false; 4306} 4307 4308bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4309 CXXRecordDecl *RD = MD->getParent(); 4310 assert(!RD->isDependentType() && "do deletion after instantiation"); 4311 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4312 return false; 4313 4314 SourceLocation Loc = MD->getLocation(); 4315 4316 // Do access control from the constructor 4317 ContextRAII MethodContext(*this, MD); 4318 4319 bool Union = RD->isUnion(); 4320 4321 // We do this because we should never actually use an anonymous 4322 // union's constructor. 4323 if (Union && RD->isAnonymousStructOrUnion()) 4324 return false; 4325 4326 // C++0x [class.copy]/20 4327 // A defaulted [move] assignment operator for class X is defined as deleted 4328 // if X has: 4329 4330 // -- for the move constructor, [...] any direct or indirect virtual base 4331 // class. 4332 if (RD->getNumVBases() != 0) 4333 return true; 4334 4335 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4336 BE = RD->bases_end(); 4337 BI != BE; ++BI) { 4338 4339 QualType BaseType = BI->getType(); 4340 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4341 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4342 4343 // -- a [direct base class] B that cannot be [moved] because overload 4344 // resolution, as applied to B's [move] assignment operator, results in 4345 // an ambiguity or a function that is deleted or inaccessible from the 4346 // assignment operator 4347 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4348 if (!MoveOper || MoveOper->isDeleted()) 4349 return true; 4350 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4351 return true; 4352 4353 // -- for the move assignment operator, a [direct base class] with a type 4354 // that does not have a move assignment operator and is not trivially 4355 // copyable. 4356 if (!MoveOper->isMoveAssignmentOperator() && 4357 !BaseDecl->isTriviallyCopyable()) 4358 return true; 4359 } 4360 4361 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4362 FE = RD->field_end(); 4363 FI != FE; ++FI) { 4364 QualType FieldType = Context.getBaseElementType(FI->getType()); 4365 4366 // -- a non-static data member of reference type 4367 if (FieldType->isReferenceType()) 4368 return true; 4369 4370 // -- a non-static data member of const non-class type (or array thereof) 4371 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4372 return true; 4373 4374 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4375 4376 if (FieldRecord) { 4377 // This is an anonymous union 4378 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4379 // Anonymous unions inside unions do not variant members create 4380 if (!Union) { 4381 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4382 UE = FieldRecord->field_end(); 4383 UI != UE; ++UI) { 4384 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4385 CXXRecordDecl *UnionFieldRecord = 4386 UnionFieldType->getAsCXXRecordDecl(); 4387 4388 // -- a variant member with a non-trivial [move] assignment operator 4389 // and X is a union-like class 4390 if (UnionFieldRecord && 4391 !UnionFieldRecord->hasTrivialMoveAssignment()) 4392 return true; 4393 } 4394 } 4395 4396 // Don't try to initalize an anonymous union 4397 continue; 4398 // -- a variant member with a non-trivial [move] assignment operator 4399 // and X is a union-like class 4400 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4401 return true; 4402 } 4403 4404 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4405 if (!MoveOper || MoveOper->isDeleted()) 4406 return true; 4407 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4408 return true; 4409 4410 // -- for the move assignment operator, a [non-static data member] with a 4411 // type that does not have a move assignment operator and is not 4412 // trivially copyable. 4413 if (!MoveOper->isMoveAssignmentOperator() && 4414 !FieldRecord->isTriviallyCopyable()) 4415 return true; 4416 } 4417 } 4418 4419 return false; 4420} 4421 4422bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4423 CXXRecordDecl *RD = DD->getParent(); 4424 assert(!RD->isDependentType() && "do deletion after instantiation"); 4425 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4426 return false; 4427 4428 SourceLocation Loc = DD->getLocation(); 4429 4430 // Do access control from the destructor 4431 ContextRAII CtorContext(*this, DD); 4432 4433 bool Union = RD->isUnion(); 4434 4435 // We do this because we should never actually use an anonymous 4436 // union's destructor. 4437 if (Union && RD->isAnonymousStructOrUnion()) 4438 return false; 4439 4440 // C++0x [class.dtor]p5 4441 // A defaulted destructor for a class X is defined as deleted if: 4442 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4443 BE = RD->bases_end(); 4444 BI != BE; ++BI) { 4445 // We'll handle this one later 4446 if (BI->isVirtual()) 4447 continue; 4448 4449 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4450 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4451 assert(BaseDtor && "base has no destructor"); 4452 4453 // -- any direct or virtual base class has a deleted destructor or 4454 // a destructor that is inaccessible from the defaulted destructor 4455 if (BaseDtor->isDeleted()) 4456 return true; 4457 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4458 AR_accessible) 4459 return true; 4460 } 4461 4462 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4463 BE = RD->vbases_end(); 4464 BI != BE; ++BI) { 4465 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4466 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4467 assert(BaseDtor && "base has no destructor"); 4468 4469 // -- any direct or virtual base class has a deleted destructor or 4470 // a destructor that is inaccessible from the defaulted destructor 4471 if (BaseDtor->isDeleted()) 4472 return true; 4473 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4474 AR_accessible) 4475 return true; 4476 } 4477 4478 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4479 FE = RD->field_end(); 4480 FI != FE; ++FI) { 4481 QualType FieldType = Context.getBaseElementType(FI->getType()); 4482 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4483 if (FieldRecord) { 4484 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4485 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4486 UE = FieldRecord->field_end(); 4487 UI != UE; ++UI) { 4488 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4489 CXXRecordDecl *UnionFieldRecord = 4490 UnionFieldType->getAsCXXRecordDecl(); 4491 4492 // -- X is a union-like class that has a variant member with a non- 4493 // trivial destructor. 4494 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4495 return true; 4496 } 4497 // Technically we are supposed to do this next check unconditionally. 4498 // But that makes absolutely no sense. 4499 } else { 4500 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4501 4502 // -- any of the non-static data members has class type M (or array 4503 // thereof) and M has a deleted destructor or a destructor that is 4504 // inaccessible from the defaulted destructor 4505 if (FieldDtor->isDeleted()) 4506 return true; 4507 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4508 AR_accessible) 4509 return true; 4510 4511 // -- X is a union-like class that has a variant member with a non- 4512 // trivial destructor. 4513 if (Union && !FieldDtor->isTrivial()) 4514 return true; 4515 } 4516 } 4517 } 4518 4519 if (DD->isVirtual()) { 4520 FunctionDecl *OperatorDelete = 0; 4521 DeclarationName Name = 4522 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4523 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4524 false)) 4525 return true; 4526 } 4527 4528 4529 return false; 4530} 4531 4532/// \brief Data used with FindHiddenVirtualMethod 4533namespace { 4534 struct FindHiddenVirtualMethodData { 4535 Sema *S; 4536 CXXMethodDecl *Method; 4537 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4538 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4539 }; 4540} 4541 4542/// \brief Member lookup function that determines whether a given C++ 4543/// method overloads virtual methods in a base class without overriding any, 4544/// to be used with CXXRecordDecl::lookupInBases(). 4545static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4546 CXXBasePath &Path, 4547 void *UserData) { 4548 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4549 4550 FindHiddenVirtualMethodData &Data 4551 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4552 4553 DeclarationName Name = Data.Method->getDeclName(); 4554 assert(Name.getNameKind() == DeclarationName::Identifier); 4555 4556 bool foundSameNameMethod = false; 4557 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4558 for (Path.Decls = BaseRecord->lookup(Name); 4559 Path.Decls.first != Path.Decls.second; 4560 ++Path.Decls.first) { 4561 NamedDecl *D = *Path.Decls.first; 4562 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4563 MD = MD->getCanonicalDecl(); 4564 foundSameNameMethod = true; 4565 // Interested only in hidden virtual methods. 4566 if (!MD->isVirtual()) 4567 continue; 4568 // If the method we are checking overrides a method from its base 4569 // don't warn about the other overloaded methods. 4570 if (!Data.S->IsOverload(Data.Method, MD, false)) 4571 return true; 4572 // Collect the overload only if its hidden. 4573 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4574 overloadedMethods.push_back(MD); 4575 } 4576 } 4577 4578 if (foundSameNameMethod) 4579 Data.OverloadedMethods.append(overloadedMethods.begin(), 4580 overloadedMethods.end()); 4581 return foundSameNameMethod; 4582} 4583 4584/// \brief See if a method overloads virtual methods in a base class without 4585/// overriding any. 4586void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4587 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4588 MD->getLocation()) == Diagnostic::Ignored) 4589 return; 4590 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4591 return; 4592 4593 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4594 /*bool RecordPaths=*/false, 4595 /*bool DetectVirtual=*/false); 4596 FindHiddenVirtualMethodData Data; 4597 Data.Method = MD; 4598 Data.S = this; 4599 4600 // Keep the base methods that were overriden or introduced in the subclass 4601 // by 'using' in a set. A base method not in this set is hidden. 4602 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4603 res.first != res.second; ++res.first) { 4604 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4605 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4606 E = MD->end_overridden_methods(); 4607 I != E; ++I) 4608 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4609 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4610 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4611 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4612 } 4613 4614 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4615 !Data.OverloadedMethods.empty()) { 4616 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4617 << MD << (Data.OverloadedMethods.size() > 1); 4618 4619 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4620 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4621 Diag(overloadedMD->getLocation(), 4622 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4623 } 4624 } 4625} 4626 4627void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4628 Decl *TagDecl, 4629 SourceLocation LBrac, 4630 SourceLocation RBrac, 4631 AttributeList *AttrList) { 4632 if (!TagDecl) 4633 return; 4634 4635 AdjustDeclIfTemplate(TagDecl); 4636 4637 ActOnFields(S, RLoc, TagDecl, 4638 // strict aliasing violation! 4639 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4640 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 4641 4642 CheckCompletedCXXClass( 4643 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4644} 4645 4646/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4647/// special functions, such as the default constructor, copy 4648/// constructor, or destructor, to the given C++ class (C++ 4649/// [special]p1). This routine can only be executed just before the 4650/// definition of the class is complete. 4651void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4652 if (!ClassDecl->hasUserDeclaredConstructor()) 4653 ++ASTContext::NumImplicitDefaultConstructors; 4654 4655 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4656 ++ASTContext::NumImplicitCopyConstructors; 4657 4658 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4659 ++ASTContext::NumImplicitCopyAssignmentOperators; 4660 4661 // If we have a dynamic class, then the copy assignment operator may be 4662 // virtual, so we have to declare it immediately. This ensures that, e.g., 4663 // it shows up in the right place in the vtable and that we diagnose 4664 // problems with the implicit exception specification. 4665 if (ClassDecl->isDynamicClass()) 4666 DeclareImplicitCopyAssignment(ClassDecl); 4667 } 4668 4669 if (!ClassDecl->hasUserDeclaredDestructor()) { 4670 ++ASTContext::NumImplicitDestructors; 4671 4672 // If we have a dynamic class, then the destructor may be virtual, so we 4673 // have to declare the destructor immediately. This ensures that, e.g., it 4674 // shows up in the right place in the vtable and that we diagnose problems 4675 // with the implicit exception specification. 4676 if (ClassDecl->isDynamicClass()) 4677 DeclareImplicitDestructor(ClassDecl); 4678 } 4679} 4680 4681void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4682 if (!D) 4683 return; 4684 4685 int NumParamList = D->getNumTemplateParameterLists(); 4686 for (int i = 0; i < NumParamList; i++) { 4687 TemplateParameterList* Params = D->getTemplateParameterList(i); 4688 for (TemplateParameterList::iterator Param = Params->begin(), 4689 ParamEnd = Params->end(); 4690 Param != ParamEnd; ++Param) { 4691 NamedDecl *Named = cast<NamedDecl>(*Param); 4692 if (Named->getDeclName()) { 4693 S->AddDecl(Named); 4694 IdResolver.AddDecl(Named); 4695 } 4696 } 4697 } 4698} 4699 4700void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4701 if (!D) 4702 return; 4703 4704 TemplateParameterList *Params = 0; 4705 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4706 Params = Template->getTemplateParameters(); 4707 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4708 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4709 Params = PartialSpec->getTemplateParameters(); 4710 else 4711 return; 4712 4713 for (TemplateParameterList::iterator Param = Params->begin(), 4714 ParamEnd = Params->end(); 4715 Param != ParamEnd; ++Param) { 4716 NamedDecl *Named = cast<NamedDecl>(*Param); 4717 if (Named->getDeclName()) { 4718 S->AddDecl(Named); 4719 IdResolver.AddDecl(Named); 4720 } 4721 } 4722} 4723 4724void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4725 if (!RecordD) return; 4726 AdjustDeclIfTemplate(RecordD); 4727 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4728 PushDeclContext(S, Record); 4729} 4730 4731void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4732 if (!RecordD) return; 4733 PopDeclContext(); 4734} 4735 4736/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4737/// parsing a top-level (non-nested) C++ class, and we are now 4738/// parsing those parts of the given Method declaration that could 4739/// not be parsed earlier (C++ [class.mem]p2), such as default 4740/// arguments. This action should enter the scope of the given 4741/// Method declaration as if we had just parsed the qualified method 4742/// name. However, it should not bring the parameters into scope; 4743/// that will be performed by ActOnDelayedCXXMethodParameter. 4744void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4745} 4746 4747/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4748/// C++ method declaration. We're (re-)introducing the given 4749/// function parameter into scope for use in parsing later parts of 4750/// the method declaration. For example, we could see an 4751/// ActOnParamDefaultArgument event for this parameter. 4752void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4753 if (!ParamD) 4754 return; 4755 4756 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4757 4758 // If this parameter has an unparsed default argument, clear it out 4759 // to make way for the parsed default argument. 4760 if (Param->hasUnparsedDefaultArg()) 4761 Param->setDefaultArg(0); 4762 4763 S->AddDecl(Param); 4764 if (Param->getDeclName()) 4765 IdResolver.AddDecl(Param); 4766} 4767 4768/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4769/// processing the delayed method declaration for Method. The method 4770/// declaration is now considered finished. There may be a separate 4771/// ActOnStartOfFunctionDef action later (not necessarily 4772/// immediately!) for this method, if it was also defined inside the 4773/// class body. 4774void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4775 if (!MethodD) 4776 return; 4777 4778 AdjustDeclIfTemplate(MethodD); 4779 4780 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4781 4782 // Now that we have our default arguments, check the constructor 4783 // again. It could produce additional diagnostics or affect whether 4784 // the class has implicitly-declared destructors, among other 4785 // things. 4786 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4787 CheckConstructor(Constructor); 4788 4789 // Check the default arguments, which we may have added. 4790 if (!Method->isInvalidDecl()) 4791 CheckCXXDefaultArguments(Method); 4792} 4793 4794/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4795/// the well-formedness of the constructor declarator @p D with type @p 4796/// R. If there are any errors in the declarator, this routine will 4797/// emit diagnostics and set the invalid bit to true. In any case, the type 4798/// will be updated to reflect a well-formed type for the constructor and 4799/// returned. 4800QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4801 StorageClass &SC) { 4802 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4803 4804 // C++ [class.ctor]p3: 4805 // A constructor shall not be virtual (10.3) or static (9.4). A 4806 // constructor can be invoked for a const, volatile or const 4807 // volatile object. A constructor shall not be declared const, 4808 // volatile, or const volatile (9.3.2). 4809 if (isVirtual) { 4810 if (!D.isInvalidType()) 4811 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4812 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4813 << SourceRange(D.getIdentifierLoc()); 4814 D.setInvalidType(); 4815 } 4816 if (SC == SC_Static) { 4817 if (!D.isInvalidType()) 4818 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4819 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4820 << SourceRange(D.getIdentifierLoc()); 4821 D.setInvalidType(); 4822 SC = SC_None; 4823 } 4824 4825 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4826 if (FTI.TypeQuals != 0) { 4827 if (FTI.TypeQuals & Qualifiers::Const) 4828 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4829 << "const" << SourceRange(D.getIdentifierLoc()); 4830 if (FTI.TypeQuals & Qualifiers::Volatile) 4831 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4832 << "volatile" << SourceRange(D.getIdentifierLoc()); 4833 if (FTI.TypeQuals & Qualifiers::Restrict) 4834 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4835 << "restrict" << SourceRange(D.getIdentifierLoc()); 4836 D.setInvalidType(); 4837 } 4838 4839 // C++0x [class.ctor]p4: 4840 // A constructor shall not be declared with a ref-qualifier. 4841 if (FTI.hasRefQualifier()) { 4842 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4843 << FTI.RefQualifierIsLValueRef 4844 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4845 D.setInvalidType(); 4846 } 4847 4848 // Rebuild the function type "R" without any type qualifiers (in 4849 // case any of the errors above fired) and with "void" as the 4850 // return type, since constructors don't have return types. 4851 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4852 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4853 return R; 4854 4855 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4856 EPI.TypeQuals = 0; 4857 EPI.RefQualifier = RQ_None; 4858 4859 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4860 Proto->getNumArgs(), EPI); 4861} 4862 4863/// CheckConstructor - Checks a fully-formed constructor for 4864/// well-formedness, issuing any diagnostics required. Returns true if 4865/// the constructor declarator is invalid. 4866void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4867 CXXRecordDecl *ClassDecl 4868 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4869 if (!ClassDecl) 4870 return Constructor->setInvalidDecl(); 4871 4872 // C++ [class.copy]p3: 4873 // A declaration of a constructor for a class X is ill-formed if 4874 // its first parameter is of type (optionally cv-qualified) X and 4875 // either there are no other parameters or else all other 4876 // parameters have default arguments. 4877 if (!Constructor->isInvalidDecl() && 4878 ((Constructor->getNumParams() == 1) || 4879 (Constructor->getNumParams() > 1 && 4880 Constructor->getParamDecl(1)->hasDefaultArg())) && 4881 Constructor->getTemplateSpecializationKind() 4882 != TSK_ImplicitInstantiation) { 4883 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4884 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4885 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4886 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4887 const char *ConstRef 4888 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4889 : " const &"; 4890 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4891 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4892 4893 // FIXME: Rather that making the constructor invalid, we should endeavor 4894 // to fix the type. 4895 Constructor->setInvalidDecl(); 4896 } 4897 } 4898} 4899 4900/// CheckDestructor - Checks a fully-formed destructor definition for 4901/// well-formedness, issuing any diagnostics required. Returns true 4902/// on error. 4903bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4904 CXXRecordDecl *RD = Destructor->getParent(); 4905 4906 if (Destructor->isVirtual()) { 4907 SourceLocation Loc; 4908 4909 if (!Destructor->isImplicit()) 4910 Loc = Destructor->getLocation(); 4911 else 4912 Loc = RD->getLocation(); 4913 4914 // If we have a virtual destructor, look up the deallocation function 4915 FunctionDecl *OperatorDelete = 0; 4916 DeclarationName Name = 4917 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4918 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4919 return true; 4920 4921 MarkDeclarationReferenced(Loc, OperatorDelete); 4922 4923 Destructor->setOperatorDelete(OperatorDelete); 4924 } 4925 4926 return false; 4927} 4928 4929static inline bool 4930FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4931 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4932 FTI.ArgInfo[0].Param && 4933 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4934} 4935 4936/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4937/// the well-formednes of the destructor declarator @p D with type @p 4938/// R. If there are any errors in the declarator, this routine will 4939/// emit diagnostics and set the declarator to invalid. Even if this happens, 4940/// will be updated to reflect a well-formed type for the destructor and 4941/// returned. 4942QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4943 StorageClass& SC) { 4944 // C++ [class.dtor]p1: 4945 // [...] A typedef-name that names a class is a class-name 4946 // (7.1.3); however, a typedef-name that names a class shall not 4947 // be used as the identifier in the declarator for a destructor 4948 // declaration. 4949 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 4950 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 4951 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4952 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 4953 else if (const TemplateSpecializationType *TST = 4954 DeclaratorType->getAs<TemplateSpecializationType>()) 4955 if (TST->isTypeAlias()) 4956 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4957 << DeclaratorType << 1; 4958 4959 // C++ [class.dtor]p2: 4960 // A destructor is used to destroy objects of its class type. A 4961 // destructor takes no parameters, and no return type can be 4962 // specified for it (not even void). The address of a destructor 4963 // shall not be taken. A destructor shall not be static. A 4964 // destructor can be invoked for a const, volatile or const 4965 // volatile object. A destructor shall not be declared const, 4966 // volatile or const volatile (9.3.2). 4967 if (SC == SC_Static) { 4968 if (!D.isInvalidType()) 4969 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 4970 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4971 << SourceRange(D.getIdentifierLoc()) 4972 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4973 4974 SC = SC_None; 4975 } 4976 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4977 // Destructors don't have return types, but the parser will 4978 // happily parse something like: 4979 // 4980 // class X { 4981 // float ~X(); 4982 // }; 4983 // 4984 // The return type will be eliminated later. 4985 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 4986 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4987 << SourceRange(D.getIdentifierLoc()); 4988 } 4989 4990 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4991 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 4992 if (FTI.TypeQuals & Qualifiers::Const) 4993 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4994 << "const" << SourceRange(D.getIdentifierLoc()); 4995 if (FTI.TypeQuals & Qualifiers::Volatile) 4996 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4997 << "volatile" << SourceRange(D.getIdentifierLoc()); 4998 if (FTI.TypeQuals & Qualifiers::Restrict) 4999 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5000 << "restrict" << SourceRange(D.getIdentifierLoc()); 5001 D.setInvalidType(); 5002 } 5003 5004 // C++0x [class.dtor]p2: 5005 // A destructor shall not be declared with a ref-qualifier. 5006 if (FTI.hasRefQualifier()) { 5007 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5008 << FTI.RefQualifierIsLValueRef 5009 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5010 D.setInvalidType(); 5011 } 5012 5013 // Make sure we don't have any parameters. 5014 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5015 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5016 5017 // Delete the parameters. 5018 FTI.freeArgs(); 5019 D.setInvalidType(); 5020 } 5021 5022 // Make sure the destructor isn't variadic. 5023 if (FTI.isVariadic) { 5024 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5025 D.setInvalidType(); 5026 } 5027 5028 // Rebuild the function type "R" without any type qualifiers or 5029 // parameters (in case any of the errors above fired) and with 5030 // "void" as the return type, since destructors don't have return 5031 // types. 5032 if (!D.isInvalidType()) 5033 return R; 5034 5035 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5036 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5037 EPI.Variadic = false; 5038 EPI.TypeQuals = 0; 5039 EPI.RefQualifier = RQ_None; 5040 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5041} 5042 5043/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5044/// well-formednes of the conversion function declarator @p D with 5045/// type @p R. If there are any errors in the declarator, this routine 5046/// will emit diagnostics and return true. Otherwise, it will return 5047/// false. Either way, the type @p R will be updated to reflect a 5048/// well-formed type for the conversion operator. 5049void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5050 StorageClass& SC) { 5051 // C++ [class.conv.fct]p1: 5052 // Neither parameter types nor return type can be specified. The 5053 // type of a conversion function (8.3.5) is "function taking no 5054 // parameter returning conversion-type-id." 5055 if (SC == SC_Static) { 5056 if (!D.isInvalidType()) 5057 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5058 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5059 << SourceRange(D.getIdentifierLoc()); 5060 D.setInvalidType(); 5061 SC = SC_None; 5062 } 5063 5064 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5065 5066 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5067 // Conversion functions don't have return types, but the parser will 5068 // happily parse something like: 5069 // 5070 // class X { 5071 // float operator bool(); 5072 // }; 5073 // 5074 // The return type will be changed later anyway. 5075 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5076 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5077 << SourceRange(D.getIdentifierLoc()); 5078 D.setInvalidType(); 5079 } 5080 5081 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5082 5083 // Make sure we don't have any parameters. 5084 if (Proto->getNumArgs() > 0) { 5085 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5086 5087 // Delete the parameters. 5088 D.getFunctionTypeInfo().freeArgs(); 5089 D.setInvalidType(); 5090 } else if (Proto->isVariadic()) { 5091 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5092 D.setInvalidType(); 5093 } 5094 5095 // Diagnose "&operator bool()" and other such nonsense. This 5096 // is actually a gcc extension which we don't support. 5097 if (Proto->getResultType() != ConvType) { 5098 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5099 << Proto->getResultType(); 5100 D.setInvalidType(); 5101 ConvType = Proto->getResultType(); 5102 } 5103 5104 // C++ [class.conv.fct]p4: 5105 // The conversion-type-id shall not represent a function type nor 5106 // an array type. 5107 if (ConvType->isArrayType()) { 5108 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5109 ConvType = Context.getPointerType(ConvType); 5110 D.setInvalidType(); 5111 } else if (ConvType->isFunctionType()) { 5112 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5113 ConvType = Context.getPointerType(ConvType); 5114 D.setInvalidType(); 5115 } 5116 5117 // Rebuild the function type "R" without any parameters (in case any 5118 // of the errors above fired) and with the conversion type as the 5119 // return type. 5120 if (D.isInvalidType()) 5121 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5122 5123 // C++0x explicit conversion operators. 5124 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 5125 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5126 diag::warn_explicit_conversion_functions) 5127 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5128} 5129 5130/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5131/// the declaration of the given C++ conversion function. This routine 5132/// is responsible for recording the conversion function in the C++ 5133/// class, if possible. 5134Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5135 assert(Conversion && "Expected to receive a conversion function declaration"); 5136 5137 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5138 5139 // Make sure we aren't redeclaring the conversion function. 5140 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5141 5142 // C++ [class.conv.fct]p1: 5143 // [...] A conversion function is never used to convert a 5144 // (possibly cv-qualified) object to the (possibly cv-qualified) 5145 // same object type (or a reference to it), to a (possibly 5146 // cv-qualified) base class of that type (or a reference to it), 5147 // or to (possibly cv-qualified) void. 5148 // FIXME: Suppress this warning if the conversion function ends up being a 5149 // virtual function that overrides a virtual function in a base class. 5150 QualType ClassType 5151 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5152 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5153 ConvType = ConvTypeRef->getPointeeType(); 5154 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5155 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5156 /* Suppress diagnostics for instantiations. */; 5157 else if (ConvType->isRecordType()) { 5158 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5159 if (ConvType == ClassType) 5160 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5161 << ClassType; 5162 else if (IsDerivedFrom(ClassType, ConvType)) 5163 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5164 << ClassType << ConvType; 5165 } else if (ConvType->isVoidType()) { 5166 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5167 << ClassType << ConvType; 5168 } 5169 5170 if (FunctionTemplateDecl *ConversionTemplate 5171 = Conversion->getDescribedFunctionTemplate()) 5172 return ConversionTemplate; 5173 5174 return Conversion; 5175} 5176 5177//===----------------------------------------------------------------------===// 5178// Namespace Handling 5179//===----------------------------------------------------------------------===// 5180 5181 5182 5183/// ActOnStartNamespaceDef - This is called at the start of a namespace 5184/// definition. 5185Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5186 SourceLocation InlineLoc, 5187 SourceLocation NamespaceLoc, 5188 SourceLocation IdentLoc, 5189 IdentifierInfo *II, 5190 SourceLocation LBrace, 5191 AttributeList *AttrList) { 5192 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5193 // For anonymous namespace, take the location of the left brace. 5194 SourceLocation Loc = II ? IdentLoc : LBrace; 5195 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 5196 StartLoc, Loc, II); 5197 Namespc->setInline(InlineLoc.isValid()); 5198 5199 Scope *DeclRegionScope = NamespcScope->getParent(); 5200 5201 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5202 5203 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5204 PushNamespaceVisibilityAttr(Attr); 5205 5206 if (II) { 5207 // C++ [namespace.def]p2: 5208 // The identifier in an original-namespace-definition shall not 5209 // have been previously defined in the declarative region in 5210 // which the original-namespace-definition appears. The 5211 // identifier in an original-namespace-definition is the name of 5212 // the namespace. Subsequently in that declarative region, it is 5213 // treated as an original-namespace-name. 5214 // 5215 // Since namespace names are unique in their scope, and we don't 5216 // look through using directives, just look for any ordinary names. 5217 5218 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5219 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5220 Decl::IDNS_Namespace; 5221 NamedDecl *PrevDecl = 0; 5222 for (DeclContext::lookup_result R 5223 = CurContext->getRedeclContext()->lookup(II); 5224 R.first != R.second; ++R.first) { 5225 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5226 PrevDecl = *R.first; 5227 break; 5228 } 5229 } 5230 5231 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 5232 // This is an extended namespace definition. 5233 if (Namespc->isInline() != OrigNS->isInline()) { 5234 // inline-ness must match 5235 if (OrigNS->isInline()) { 5236 // The user probably just forgot the 'inline', so suggest that it 5237 // be added back. 5238 Diag(Namespc->getLocation(), 5239 diag::warn_inline_namespace_reopened_noninline) 5240 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5241 } else { 5242 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5243 << Namespc->isInline(); 5244 } 5245 Diag(OrigNS->getLocation(), diag::note_previous_definition); 5246 5247 // Recover by ignoring the new namespace's inline status. 5248 Namespc->setInline(OrigNS->isInline()); 5249 } 5250 5251 // Attach this namespace decl to the chain of extended namespace 5252 // definitions. 5253 OrigNS->setNextNamespace(Namespc); 5254 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 5255 5256 // Remove the previous declaration from the scope. 5257 if (DeclRegionScope->isDeclScope(OrigNS)) { 5258 IdResolver.RemoveDecl(OrigNS); 5259 DeclRegionScope->RemoveDecl(OrigNS); 5260 } 5261 } else if (PrevDecl) { 5262 // This is an invalid name redefinition. 5263 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 5264 << Namespc->getDeclName(); 5265 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5266 Namespc->setInvalidDecl(); 5267 // Continue on to push Namespc as current DeclContext and return it. 5268 } else if (II->isStr("std") && 5269 CurContext->getRedeclContext()->isTranslationUnit()) { 5270 // This is the first "real" definition of the namespace "std", so update 5271 // our cache of the "std" namespace to point at this definition. 5272 if (NamespaceDecl *StdNS = getStdNamespace()) { 5273 // We had already defined a dummy namespace "std". Link this new 5274 // namespace definition to the dummy namespace "std". 5275 StdNS->setNextNamespace(Namespc); 5276 StdNS->setLocation(IdentLoc); 5277 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 5278 } 5279 5280 // Make our StdNamespace cache point at the first real definition of the 5281 // "std" namespace. 5282 StdNamespace = Namespc; 5283 5284 // Add this instance of "std" to the set of known namespaces 5285 KnownNamespaces[Namespc] = false; 5286 } else if (!Namespc->isInline()) { 5287 // Since this is an "original" namespace, add it to the known set of 5288 // namespaces if it is not an inline namespace. 5289 KnownNamespaces[Namespc] = false; 5290 } 5291 5292 PushOnScopeChains(Namespc, DeclRegionScope); 5293 } else { 5294 // Anonymous namespaces. 5295 assert(Namespc->isAnonymousNamespace()); 5296 5297 // Link the anonymous namespace into its parent. 5298 NamespaceDecl *PrevDecl; 5299 DeclContext *Parent = CurContext->getRedeclContext(); 5300 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5301 PrevDecl = TU->getAnonymousNamespace(); 5302 TU->setAnonymousNamespace(Namespc); 5303 } else { 5304 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5305 PrevDecl = ND->getAnonymousNamespace(); 5306 ND->setAnonymousNamespace(Namespc); 5307 } 5308 5309 // Link the anonymous namespace with its previous declaration. 5310 if (PrevDecl) { 5311 assert(PrevDecl->isAnonymousNamespace()); 5312 assert(!PrevDecl->getNextNamespace()); 5313 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 5314 PrevDecl->setNextNamespace(Namespc); 5315 5316 if (Namespc->isInline() != PrevDecl->isInline()) { 5317 // inline-ness must match 5318 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5319 << Namespc->isInline(); 5320 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5321 Namespc->setInvalidDecl(); 5322 // Recover by ignoring the new namespace's inline status. 5323 Namespc->setInline(PrevDecl->isInline()); 5324 } 5325 } 5326 5327 CurContext->addDecl(Namespc); 5328 5329 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5330 // behaves as if it were replaced by 5331 // namespace unique { /* empty body */ } 5332 // using namespace unique; 5333 // namespace unique { namespace-body } 5334 // where all occurrences of 'unique' in a translation unit are 5335 // replaced by the same identifier and this identifier differs 5336 // from all other identifiers in the entire program. 5337 5338 // We just create the namespace with an empty name and then add an 5339 // implicit using declaration, just like the standard suggests. 5340 // 5341 // CodeGen enforces the "universally unique" aspect by giving all 5342 // declarations semantically contained within an anonymous 5343 // namespace internal linkage. 5344 5345 if (!PrevDecl) { 5346 UsingDirectiveDecl* UD 5347 = UsingDirectiveDecl::Create(Context, CurContext, 5348 /* 'using' */ LBrace, 5349 /* 'namespace' */ SourceLocation(), 5350 /* qualifier */ NestedNameSpecifierLoc(), 5351 /* identifier */ SourceLocation(), 5352 Namespc, 5353 /* Ancestor */ CurContext); 5354 UD->setImplicit(); 5355 CurContext->addDecl(UD); 5356 } 5357 } 5358 5359 // Although we could have an invalid decl (i.e. the namespace name is a 5360 // redefinition), push it as current DeclContext and try to continue parsing. 5361 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5362 // for the namespace has the declarations that showed up in that particular 5363 // namespace definition. 5364 PushDeclContext(NamespcScope, Namespc); 5365 return Namespc; 5366} 5367 5368/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5369/// is a namespace alias, returns the namespace it points to. 5370static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5371 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5372 return AD->getNamespace(); 5373 return dyn_cast_or_null<NamespaceDecl>(D); 5374} 5375 5376/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5377/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5378void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5379 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5380 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5381 Namespc->setRBraceLoc(RBrace); 5382 PopDeclContext(); 5383 if (Namespc->hasAttr<VisibilityAttr>()) 5384 PopPragmaVisibility(); 5385} 5386 5387CXXRecordDecl *Sema::getStdBadAlloc() const { 5388 return cast_or_null<CXXRecordDecl>( 5389 StdBadAlloc.get(Context.getExternalSource())); 5390} 5391 5392NamespaceDecl *Sema::getStdNamespace() const { 5393 return cast_or_null<NamespaceDecl>( 5394 StdNamespace.get(Context.getExternalSource())); 5395} 5396 5397/// \brief Retrieve the special "std" namespace, which may require us to 5398/// implicitly define the namespace. 5399NamespaceDecl *Sema::getOrCreateStdNamespace() { 5400 if (!StdNamespace) { 5401 // The "std" namespace has not yet been defined, so build one implicitly. 5402 StdNamespace = NamespaceDecl::Create(Context, 5403 Context.getTranslationUnitDecl(), 5404 SourceLocation(), SourceLocation(), 5405 &PP.getIdentifierTable().get("std")); 5406 getStdNamespace()->setImplicit(true); 5407 } 5408 5409 return getStdNamespace(); 5410} 5411 5412/// \brief Determine whether a using statement is in a context where it will be 5413/// apply in all contexts. 5414static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5415 switch (CurContext->getDeclKind()) { 5416 case Decl::TranslationUnit: 5417 return true; 5418 case Decl::LinkageSpec: 5419 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5420 default: 5421 return false; 5422 } 5423} 5424 5425static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5426 CXXScopeSpec &SS, 5427 SourceLocation IdentLoc, 5428 IdentifierInfo *Ident) { 5429 R.clear(); 5430 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5431 R.getLookupKind(), Sc, &SS, NULL, 5432 false, S.CTC_NoKeywords, NULL)) { 5433 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 5434 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 5435 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5436 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5437 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5438 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5439 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5440 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5441 else 5442 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5443 << Ident << CorrectedQuotedStr 5444 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5445 5446 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5447 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5448 5449 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5450 R.addDecl(Corrected.getCorrectionDecl()); 5451 return true; 5452 } 5453 R.setLookupName(Ident); 5454 } 5455 return false; 5456} 5457 5458Decl *Sema::ActOnUsingDirective(Scope *S, 5459 SourceLocation UsingLoc, 5460 SourceLocation NamespcLoc, 5461 CXXScopeSpec &SS, 5462 SourceLocation IdentLoc, 5463 IdentifierInfo *NamespcName, 5464 AttributeList *AttrList) { 5465 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5466 assert(NamespcName && "Invalid NamespcName."); 5467 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5468 5469 // This can only happen along a recovery path. 5470 while (S->getFlags() & Scope::TemplateParamScope) 5471 S = S->getParent(); 5472 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5473 5474 UsingDirectiveDecl *UDir = 0; 5475 NestedNameSpecifier *Qualifier = 0; 5476 if (SS.isSet()) 5477 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5478 5479 // Lookup namespace name. 5480 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5481 LookupParsedName(R, S, &SS); 5482 if (R.isAmbiguous()) 5483 return 0; 5484 5485 if (R.empty()) { 5486 R.clear(); 5487 // Allow "using namespace std;" or "using namespace ::std;" even if 5488 // "std" hasn't been defined yet, for GCC compatibility. 5489 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5490 NamespcName->isStr("std")) { 5491 Diag(IdentLoc, diag::ext_using_undefined_std); 5492 R.addDecl(getOrCreateStdNamespace()); 5493 R.resolveKind(); 5494 } 5495 // Otherwise, attempt typo correction. 5496 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5497 } 5498 5499 if (!R.empty()) { 5500 NamedDecl *Named = R.getFoundDecl(); 5501 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5502 && "expected namespace decl"); 5503 // C++ [namespace.udir]p1: 5504 // A using-directive specifies that the names in the nominated 5505 // namespace can be used in the scope in which the 5506 // using-directive appears after the using-directive. During 5507 // unqualified name lookup (3.4.1), the names appear as if they 5508 // were declared in the nearest enclosing namespace which 5509 // contains both the using-directive and the nominated 5510 // namespace. [Note: in this context, "contains" means "contains 5511 // directly or indirectly". ] 5512 5513 // Find enclosing context containing both using-directive and 5514 // nominated namespace. 5515 NamespaceDecl *NS = getNamespaceDecl(Named); 5516 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5517 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5518 CommonAncestor = CommonAncestor->getParent(); 5519 5520 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5521 SS.getWithLocInContext(Context), 5522 IdentLoc, Named, CommonAncestor); 5523 5524 if (IsUsingDirectiveInToplevelContext(CurContext) && 5525 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5526 Diag(IdentLoc, diag::warn_using_directive_in_header); 5527 } 5528 5529 PushUsingDirective(S, UDir); 5530 } else { 5531 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5532 } 5533 5534 // FIXME: We ignore attributes for now. 5535 return UDir; 5536} 5537 5538void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5539 // If scope has associated entity, then using directive is at namespace 5540 // or translation unit scope. We add UsingDirectiveDecls, into 5541 // it's lookup structure. 5542 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5543 Ctx->addDecl(UDir); 5544 else 5545 // Otherwise it is block-sope. using-directives will affect lookup 5546 // only to the end of scope. 5547 S->PushUsingDirective(UDir); 5548} 5549 5550 5551Decl *Sema::ActOnUsingDeclaration(Scope *S, 5552 AccessSpecifier AS, 5553 bool HasUsingKeyword, 5554 SourceLocation UsingLoc, 5555 CXXScopeSpec &SS, 5556 UnqualifiedId &Name, 5557 AttributeList *AttrList, 5558 bool IsTypeName, 5559 SourceLocation TypenameLoc) { 5560 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5561 5562 switch (Name.getKind()) { 5563 case UnqualifiedId::IK_ImplicitSelfParam: 5564 case UnqualifiedId::IK_Identifier: 5565 case UnqualifiedId::IK_OperatorFunctionId: 5566 case UnqualifiedId::IK_LiteralOperatorId: 5567 case UnqualifiedId::IK_ConversionFunctionId: 5568 break; 5569 5570 case UnqualifiedId::IK_ConstructorName: 5571 case UnqualifiedId::IK_ConstructorTemplateId: 5572 // C++0x inherited constructors. 5573 if (getLangOptions().CPlusPlus0x) break; 5574 5575 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 5576 << SS.getRange(); 5577 return 0; 5578 5579 case UnqualifiedId::IK_DestructorName: 5580 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5581 << SS.getRange(); 5582 return 0; 5583 5584 case UnqualifiedId::IK_TemplateId: 5585 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5586 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5587 return 0; 5588 } 5589 5590 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5591 DeclarationName TargetName = TargetNameInfo.getName(); 5592 if (!TargetName) 5593 return 0; 5594 5595 // Warn about using declarations. 5596 // TODO: store that the declaration was written without 'using' and 5597 // talk about access decls instead of using decls in the 5598 // diagnostics. 5599 if (!HasUsingKeyword) { 5600 UsingLoc = Name.getSourceRange().getBegin(); 5601 5602 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5603 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5604 } 5605 5606 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5607 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5608 return 0; 5609 5610 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5611 TargetNameInfo, AttrList, 5612 /* IsInstantiation */ false, 5613 IsTypeName, TypenameLoc); 5614 if (UD) 5615 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5616 5617 return UD; 5618} 5619 5620/// \brief Determine whether a using declaration considers the given 5621/// declarations as "equivalent", e.g., if they are redeclarations of 5622/// the same entity or are both typedefs of the same type. 5623static bool 5624IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5625 bool &SuppressRedeclaration) { 5626 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5627 SuppressRedeclaration = false; 5628 return true; 5629 } 5630 5631 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5632 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5633 SuppressRedeclaration = true; 5634 return Context.hasSameType(TD1->getUnderlyingType(), 5635 TD2->getUnderlyingType()); 5636 } 5637 5638 return false; 5639} 5640 5641 5642/// Determines whether to create a using shadow decl for a particular 5643/// decl, given the set of decls existing prior to this using lookup. 5644bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5645 const LookupResult &Previous) { 5646 // Diagnose finding a decl which is not from a base class of the 5647 // current class. We do this now because there are cases where this 5648 // function will silently decide not to build a shadow decl, which 5649 // will pre-empt further diagnostics. 5650 // 5651 // We don't need to do this in C++0x because we do the check once on 5652 // the qualifier. 5653 // 5654 // FIXME: diagnose the following if we care enough: 5655 // struct A { int foo; }; 5656 // struct B : A { using A::foo; }; 5657 // template <class T> struct C : A {}; 5658 // template <class T> struct D : C<T> { using B::foo; } // <--- 5659 // This is invalid (during instantiation) in C++03 because B::foo 5660 // resolves to the using decl in B, which is not a base class of D<T>. 5661 // We can't diagnose it immediately because C<T> is an unknown 5662 // specialization. The UsingShadowDecl in D<T> then points directly 5663 // to A::foo, which will look well-formed when we instantiate. 5664 // The right solution is to not collapse the shadow-decl chain. 5665 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5666 DeclContext *OrigDC = Orig->getDeclContext(); 5667 5668 // Handle enums and anonymous structs. 5669 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5670 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5671 while (OrigRec->isAnonymousStructOrUnion()) 5672 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5673 5674 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5675 if (OrigDC == CurContext) { 5676 Diag(Using->getLocation(), 5677 diag::err_using_decl_nested_name_specifier_is_current_class) 5678 << Using->getQualifierLoc().getSourceRange(); 5679 Diag(Orig->getLocation(), diag::note_using_decl_target); 5680 return true; 5681 } 5682 5683 Diag(Using->getQualifierLoc().getBeginLoc(), 5684 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5685 << Using->getQualifier() 5686 << cast<CXXRecordDecl>(CurContext) 5687 << Using->getQualifierLoc().getSourceRange(); 5688 Diag(Orig->getLocation(), diag::note_using_decl_target); 5689 return true; 5690 } 5691 } 5692 5693 if (Previous.empty()) return false; 5694 5695 NamedDecl *Target = Orig; 5696 if (isa<UsingShadowDecl>(Target)) 5697 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5698 5699 // If the target happens to be one of the previous declarations, we 5700 // don't have a conflict. 5701 // 5702 // FIXME: but we might be increasing its access, in which case we 5703 // should redeclare it. 5704 NamedDecl *NonTag = 0, *Tag = 0; 5705 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5706 I != E; ++I) { 5707 NamedDecl *D = (*I)->getUnderlyingDecl(); 5708 bool Result; 5709 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5710 return Result; 5711 5712 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5713 } 5714 5715 if (Target->isFunctionOrFunctionTemplate()) { 5716 FunctionDecl *FD; 5717 if (isa<FunctionTemplateDecl>(Target)) 5718 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5719 else 5720 FD = cast<FunctionDecl>(Target); 5721 5722 NamedDecl *OldDecl = 0; 5723 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5724 case Ovl_Overload: 5725 return false; 5726 5727 case Ovl_NonFunction: 5728 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5729 break; 5730 5731 // We found a decl with the exact signature. 5732 case Ovl_Match: 5733 // If we're in a record, we want to hide the target, so we 5734 // return true (without a diagnostic) to tell the caller not to 5735 // build a shadow decl. 5736 if (CurContext->isRecord()) 5737 return true; 5738 5739 // If we're not in a record, this is an error. 5740 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5741 break; 5742 } 5743 5744 Diag(Target->getLocation(), diag::note_using_decl_target); 5745 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5746 return true; 5747 } 5748 5749 // Target is not a function. 5750 5751 if (isa<TagDecl>(Target)) { 5752 // No conflict between a tag and a non-tag. 5753 if (!Tag) return false; 5754 5755 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5756 Diag(Target->getLocation(), diag::note_using_decl_target); 5757 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5758 return true; 5759 } 5760 5761 // No conflict between a tag and a non-tag. 5762 if (!NonTag) return false; 5763 5764 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5765 Diag(Target->getLocation(), diag::note_using_decl_target); 5766 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5767 return true; 5768} 5769 5770/// Builds a shadow declaration corresponding to a 'using' declaration. 5771UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5772 UsingDecl *UD, 5773 NamedDecl *Orig) { 5774 5775 // If we resolved to another shadow declaration, just coalesce them. 5776 NamedDecl *Target = Orig; 5777 if (isa<UsingShadowDecl>(Target)) { 5778 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5779 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5780 } 5781 5782 UsingShadowDecl *Shadow 5783 = UsingShadowDecl::Create(Context, CurContext, 5784 UD->getLocation(), UD, Target); 5785 UD->addShadowDecl(Shadow); 5786 5787 Shadow->setAccess(UD->getAccess()); 5788 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5789 Shadow->setInvalidDecl(); 5790 5791 if (S) 5792 PushOnScopeChains(Shadow, S); 5793 else 5794 CurContext->addDecl(Shadow); 5795 5796 5797 return Shadow; 5798} 5799 5800/// Hides a using shadow declaration. This is required by the current 5801/// using-decl implementation when a resolvable using declaration in a 5802/// class is followed by a declaration which would hide or override 5803/// one or more of the using decl's targets; for example: 5804/// 5805/// struct Base { void foo(int); }; 5806/// struct Derived : Base { 5807/// using Base::foo; 5808/// void foo(int); 5809/// }; 5810/// 5811/// The governing language is C++03 [namespace.udecl]p12: 5812/// 5813/// When a using-declaration brings names from a base class into a 5814/// derived class scope, member functions in the derived class 5815/// override and/or hide member functions with the same name and 5816/// parameter types in a base class (rather than conflicting). 5817/// 5818/// There are two ways to implement this: 5819/// (1) optimistically create shadow decls when they're not hidden 5820/// by existing declarations, or 5821/// (2) don't create any shadow decls (or at least don't make them 5822/// visible) until we've fully parsed/instantiated the class. 5823/// The problem with (1) is that we might have to retroactively remove 5824/// a shadow decl, which requires several O(n) operations because the 5825/// decl structures are (very reasonably) not designed for removal. 5826/// (2) avoids this but is very fiddly and phase-dependent. 5827void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 5828 if (Shadow->getDeclName().getNameKind() == 5829 DeclarationName::CXXConversionFunctionName) 5830 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 5831 5832 // Remove it from the DeclContext... 5833 Shadow->getDeclContext()->removeDecl(Shadow); 5834 5835 // ...and the scope, if applicable... 5836 if (S) { 5837 S->RemoveDecl(Shadow); 5838 IdResolver.RemoveDecl(Shadow); 5839 } 5840 5841 // ...and the using decl. 5842 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 5843 5844 // TODO: complain somehow if Shadow was used. It shouldn't 5845 // be possible for this to happen, because...? 5846} 5847 5848/// Builds a using declaration. 5849/// 5850/// \param IsInstantiation - Whether this call arises from an 5851/// instantiation of an unresolved using declaration. We treat 5852/// the lookup differently for these declarations. 5853NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 5854 SourceLocation UsingLoc, 5855 CXXScopeSpec &SS, 5856 const DeclarationNameInfo &NameInfo, 5857 AttributeList *AttrList, 5858 bool IsInstantiation, 5859 bool IsTypeName, 5860 SourceLocation TypenameLoc) { 5861 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5862 SourceLocation IdentLoc = NameInfo.getLoc(); 5863 assert(IdentLoc.isValid() && "Invalid TargetName location."); 5864 5865 // FIXME: We ignore attributes for now. 5866 5867 if (SS.isEmpty()) { 5868 Diag(IdentLoc, diag::err_using_requires_qualname); 5869 return 0; 5870 } 5871 5872 // Do the redeclaration lookup in the current scope. 5873 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 5874 ForRedeclaration); 5875 Previous.setHideTags(false); 5876 if (S) { 5877 LookupName(Previous, S); 5878 5879 // It is really dumb that we have to do this. 5880 LookupResult::Filter F = Previous.makeFilter(); 5881 while (F.hasNext()) { 5882 NamedDecl *D = F.next(); 5883 if (!isDeclInScope(D, CurContext, S)) 5884 F.erase(); 5885 } 5886 F.done(); 5887 } else { 5888 assert(IsInstantiation && "no scope in non-instantiation"); 5889 assert(CurContext->isRecord() && "scope not record in instantiation"); 5890 LookupQualifiedName(Previous, CurContext); 5891 } 5892 5893 // Check for invalid redeclarations. 5894 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 5895 return 0; 5896 5897 // Check for bad qualifiers. 5898 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 5899 return 0; 5900 5901 DeclContext *LookupContext = computeDeclContext(SS); 5902 NamedDecl *D; 5903 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 5904 if (!LookupContext) { 5905 if (IsTypeName) { 5906 // FIXME: not all declaration name kinds are legal here 5907 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 5908 UsingLoc, TypenameLoc, 5909 QualifierLoc, 5910 IdentLoc, NameInfo.getName()); 5911 } else { 5912 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 5913 QualifierLoc, NameInfo); 5914 } 5915 } else { 5916 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 5917 NameInfo, IsTypeName); 5918 } 5919 D->setAccess(AS); 5920 CurContext->addDecl(D); 5921 5922 if (!LookupContext) return D; 5923 UsingDecl *UD = cast<UsingDecl>(D); 5924 5925 if (RequireCompleteDeclContext(SS, LookupContext)) { 5926 UD->setInvalidDecl(); 5927 return UD; 5928 } 5929 5930 // Constructor inheriting using decls get special treatment. 5931 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 5932 if (CheckInheritedConstructorUsingDecl(UD)) 5933 UD->setInvalidDecl(); 5934 return UD; 5935 } 5936 5937 // Otherwise, look up the target name. 5938 5939 LookupResult R(*this, NameInfo, LookupOrdinaryName); 5940 R.setUsingDeclaration(true); 5941 5942 // Unlike most lookups, we don't always want to hide tag 5943 // declarations: tag names are visible through the using declaration 5944 // even if hidden by ordinary names, *except* in a dependent context 5945 // where it's important for the sanity of two-phase lookup. 5946 if (!IsInstantiation) 5947 R.setHideTags(false); 5948 5949 LookupQualifiedName(R, LookupContext); 5950 5951 if (R.empty()) { 5952 Diag(IdentLoc, diag::err_no_member) 5953 << NameInfo.getName() << LookupContext << SS.getRange(); 5954 UD->setInvalidDecl(); 5955 return UD; 5956 } 5957 5958 if (R.isAmbiguous()) { 5959 UD->setInvalidDecl(); 5960 return UD; 5961 } 5962 5963 if (IsTypeName) { 5964 // If we asked for a typename and got a non-type decl, error out. 5965 if (!R.getAsSingle<TypeDecl>()) { 5966 Diag(IdentLoc, diag::err_using_typename_non_type); 5967 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 5968 Diag((*I)->getUnderlyingDecl()->getLocation(), 5969 diag::note_using_decl_target); 5970 UD->setInvalidDecl(); 5971 return UD; 5972 } 5973 } else { 5974 // If we asked for a non-typename and we got a type, error out, 5975 // but only if this is an instantiation of an unresolved using 5976 // decl. Otherwise just silently find the type name. 5977 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 5978 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 5979 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 5980 UD->setInvalidDecl(); 5981 return UD; 5982 } 5983 } 5984 5985 // C++0x N2914 [namespace.udecl]p6: 5986 // A using-declaration shall not name a namespace. 5987 if (R.getAsSingle<NamespaceDecl>()) { 5988 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 5989 << SS.getRange(); 5990 UD->setInvalidDecl(); 5991 return UD; 5992 } 5993 5994 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 5995 if (!CheckUsingShadowDecl(UD, *I, Previous)) 5996 BuildUsingShadowDecl(S, UD, *I); 5997 } 5998 5999 return UD; 6000} 6001 6002/// Additional checks for a using declaration referring to a constructor name. 6003bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6004 if (UD->isTypeName()) { 6005 // FIXME: Cannot specify typename when specifying constructor 6006 return true; 6007 } 6008 6009 const Type *SourceType = UD->getQualifier()->getAsType(); 6010 assert(SourceType && 6011 "Using decl naming constructor doesn't have type in scope spec."); 6012 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6013 6014 // Check whether the named type is a direct base class. 6015 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6016 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6017 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6018 BaseIt != BaseE; ++BaseIt) { 6019 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6020 if (CanonicalSourceType == BaseType) 6021 break; 6022 } 6023 6024 if (BaseIt == BaseE) { 6025 // Did not find SourceType in the bases. 6026 Diag(UD->getUsingLocation(), 6027 diag::err_using_decl_constructor_not_in_direct_base) 6028 << UD->getNameInfo().getSourceRange() 6029 << QualType(SourceType, 0) << TargetClass; 6030 return true; 6031 } 6032 6033 BaseIt->setInheritConstructors(); 6034 6035 return false; 6036} 6037 6038/// Checks that the given using declaration is not an invalid 6039/// redeclaration. Note that this is checking only for the using decl 6040/// itself, not for any ill-formedness among the UsingShadowDecls. 6041bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6042 bool isTypeName, 6043 const CXXScopeSpec &SS, 6044 SourceLocation NameLoc, 6045 const LookupResult &Prev) { 6046 // C++03 [namespace.udecl]p8: 6047 // C++0x [namespace.udecl]p10: 6048 // A using-declaration is a declaration and can therefore be used 6049 // repeatedly where (and only where) multiple declarations are 6050 // allowed. 6051 // 6052 // That's in non-member contexts. 6053 if (!CurContext->getRedeclContext()->isRecord()) 6054 return false; 6055 6056 NestedNameSpecifier *Qual 6057 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6058 6059 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6060 NamedDecl *D = *I; 6061 6062 bool DTypename; 6063 NestedNameSpecifier *DQual; 6064 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6065 DTypename = UD->isTypeName(); 6066 DQual = UD->getQualifier(); 6067 } else if (UnresolvedUsingValueDecl *UD 6068 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6069 DTypename = false; 6070 DQual = UD->getQualifier(); 6071 } else if (UnresolvedUsingTypenameDecl *UD 6072 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6073 DTypename = true; 6074 DQual = UD->getQualifier(); 6075 } else continue; 6076 6077 // using decls differ if one says 'typename' and the other doesn't. 6078 // FIXME: non-dependent using decls? 6079 if (isTypeName != DTypename) continue; 6080 6081 // using decls differ if they name different scopes (but note that 6082 // template instantiation can cause this check to trigger when it 6083 // didn't before instantiation). 6084 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6085 Context.getCanonicalNestedNameSpecifier(DQual)) 6086 continue; 6087 6088 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6089 Diag(D->getLocation(), diag::note_using_decl) << 1; 6090 return true; 6091 } 6092 6093 return false; 6094} 6095 6096 6097/// Checks that the given nested-name qualifier used in a using decl 6098/// in the current context is appropriately related to the current 6099/// scope. If an error is found, diagnoses it and returns true. 6100bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6101 const CXXScopeSpec &SS, 6102 SourceLocation NameLoc) { 6103 DeclContext *NamedContext = computeDeclContext(SS); 6104 6105 if (!CurContext->isRecord()) { 6106 // C++03 [namespace.udecl]p3: 6107 // C++0x [namespace.udecl]p8: 6108 // A using-declaration for a class member shall be a member-declaration. 6109 6110 // If we weren't able to compute a valid scope, it must be a 6111 // dependent class scope. 6112 if (!NamedContext || NamedContext->isRecord()) { 6113 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6114 << SS.getRange(); 6115 return true; 6116 } 6117 6118 // Otherwise, everything is known to be fine. 6119 return false; 6120 } 6121 6122 // The current scope is a record. 6123 6124 // If the named context is dependent, we can't decide much. 6125 if (!NamedContext) { 6126 // FIXME: in C++0x, we can diagnose if we can prove that the 6127 // nested-name-specifier does not refer to a base class, which is 6128 // still possible in some cases. 6129 6130 // Otherwise we have to conservatively report that things might be 6131 // okay. 6132 return false; 6133 } 6134 6135 if (!NamedContext->isRecord()) { 6136 // Ideally this would point at the last name in the specifier, 6137 // but we don't have that level of source info. 6138 Diag(SS.getRange().getBegin(), 6139 diag::err_using_decl_nested_name_specifier_is_not_class) 6140 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6141 return true; 6142 } 6143 6144 if (!NamedContext->isDependentContext() && 6145 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6146 return true; 6147 6148 if (getLangOptions().CPlusPlus0x) { 6149 // C++0x [namespace.udecl]p3: 6150 // In a using-declaration used as a member-declaration, the 6151 // nested-name-specifier shall name a base class of the class 6152 // being defined. 6153 6154 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6155 cast<CXXRecordDecl>(NamedContext))) { 6156 if (CurContext == NamedContext) { 6157 Diag(NameLoc, 6158 diag::err_using_decl_nested_name_specifier_is_current_class) 6159 << SS.getRange(); 6160 return true; 6161 } 6162 6163 Diag(SS.getRange().getBegin(), 6164 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6165 << (NestedNameSpecifier*) SS.getScopeRep() 6166 << cast<CXXRecordDecl>(CurContext) 6167 << SS.getRange(); 6168 return true; 6169 } 6170 6171 return false; 6172 } 6173 6174 // C++03 [namespace.udecl]p4: 6175 // A using-declaration used as a member-declaration shall refer 6176 // to a member of a base class of the class being defined [etc.]. 6177 6178 // Salient point: SS doesn't have to name a base class as long as 6179 // lookup only finds members from base classes. Therefore we can 6180 // diagnose here only if we can prove that that can't happen, 6181 // i.e. if the class hierarchies provably don't intersect. 6182 6183 // TODO: it would be nice if "definitely valid" results were cached 6184 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6185 // need to be repeated. 6186 6187 struct UserData { 6188 llvm::DenseSet<const CXXRecordDecl*> Bases; 6189 6190 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6191 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6192 Data->Bases.insert(Base); 6193 return true; 6194 } 6195 6196 bool hasDependentBases(const CXXRecordDecl *Class) { 6197 return !Class->forallBases(collect, this); 6198 } 6199 6200 /// Returns true if the base is dependent or is one of the 6201 /// accumulated base classes. 6202 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6203 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6204 return !Data->Bases.count(Base); 6205 } 6206 6207 bool mightShareBases(const CXXRecordDecl *Class) { 6208 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6209 } 6210 }; 6211 6212 UserData Data; 6213 6214 // Returns false if we find a dependent base. 6215 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6216 return false; 6217 6218 // Returns false if the class has a dependent base or if it or one 6219 // of its bases is present in the base set of the current context. 6220 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6221 return false; 6222 6223 Diag(SS.getRange().getBegin(), 6224 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6225 << (NestedNameSpecifier*) SS.getScopeRep() 6226 << cast<CXXRecordDecl>(CurContext) 6227 << SS.getRange(); 6228 6229 return true; 6230} 6231 6232Decl *Sema::ActOnAliasDeclaration(Scope *S, 6233 AccessSpecifier AS, 6234 MultiTemplateParamsArg TemplateParamLists, 6235 SourceLocation UsingLoc, 6236 UnqualifiedId &Name, 6237 TypeResult Type) { 6238 // Skip up to the relevant declaration scope. 6239 while (S->getFlags() & Scope::TemplateParamScope) 6240 S = S->getParent(); 6241 assert((S->getFlags() & Scope::DeclScope) && 6242 "got alias-declaration outside of declaration scope"); 6243 6244 if (Type.isInvalid()) 6245 return 0; 6246 6247 bool Invalid = false; 6248 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6249 TypeSourceInfo *TInfo = 0; 6250 GetTypeFromParser(Type.get(), &TInfo); 6251 6252 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6253 return 0; 6254 6255 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6256 UPPC_DeclarationType)) { 6257 Invalid = true; 6258 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6259 TInfo->getTypeLoc().getBeginLoc()); 6260 } 6261 6262 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6263 LookupName(Previous, S); 6264 6265 // Warn about shadowing the name of a template parameter. 6266 if (Previous.isSingleResult() && 6267 Previous.getFoundDecl()->isTemplateParameter()) { 6268 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 6269 Previous.getFoundDecl())) 6270 Invalid = true; 6271 Previous.clear(); 6272 } 6273 6274 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6275 "name in alias declaration must be an identifier"); 6276 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6277 Name.StartLocation, 6278 Name.Identifier, TInfo); 6279 6280 NewTD->setAccess(AS); 6281 6282 if (Invalid) 6283 NewTD->setInvalidDecl(); 6284 6285 CheckTypedefForVariablyModifiedType(S, NewTD); 6286 Invalid |= NewTD->isInvalidDecl(); 6287 6288 bool Redeclaration = false; 6289 6290 NamedDecl *NewND; 6291 if (TemplateParamLists.size()) { 6292 TypeAliasTemplateDecl *OldDecl = 0; 6293 TemplateParameterList *OldTemplateParams = 0; 6294 6295 if (TemplateParamLists.size() != 1) { 6296 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6297 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6298 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6299 } 6300 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6301 6302 // Only consider previous declarations in the same scope. 6303 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6304 /*ExplicitInstantiationOrSpecialization*/false); 6305 if (!Previous.empty()) { 6306 Redeclaration = true; 6307 6308 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6309 if (!OldDecl && !Invalid) { 6310 Diag(UsingLoc, diag::err_redefinition_different_kind) 6311 << Name.Identifier; 6312 6313 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6314 if (OldD->getLocation().isValid()) 6315 Diag(OldD->getLocation(), diag::note_previous_definition); 6316 6317 Invalid = true; 6318 } 6319 6320 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6321 if (TemplateParameterListsAreEqual(TemplateParams, 6322 OldDecl->getTemplateParameters(), 6323 /*Complain=*/true, 6324 TPL_TemplateMatch)) 6325 OldTemplateParams = OldDecl->getTemplateParameters(); 6326 else 6327 Invalid = true; 6328 6329 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6330 if (!Invalid && 6331 !Context.hasSameType(OldTD->getUnderlyingType(), 6332 NewTD->getUnderlyingType())) { 6333 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6334 // but we can't reasonably accept it. 6335 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6336 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6337 if (OldTD->getLocation().isValid()) 6338 Diag(OldTD->getLocation(), diag::note_previous_definition); 6339 Invalid = true; 6340 } 6341 } 6342 } 6343 6344 // Merge any previous default template arguments into our parameters, 6345 // and check the parameter list. 6346 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6347 TPC_TypeAliasTemplate)) 6348 return 0; 6349 6350 TypeAliasTemplateDecl *NewDecl = 6351 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6352 Name.Identifier, TemplateParams, 6353 NewTD); 6354 6355 NewDecl->setAccess(AS); 6356 6357 if (Invalid) 6358 NewDecl->setInvalidDecl(); 6359 else if (OldDecl) 6360 NewDecl->setPreviousDeclaration(OldDecl); 6361 6362 NewND = NewDecl; 6363 } else { 6364 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6365 NewND = NewTD; 6366 } 6367 6368 if (!Redeclaration) 6369 PushOnScopeChains(NewND, S); 6370 6371 return NewND; 6372} 6373 6374Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6375 SourceLocation NamespaceLoc, 6376 SourceLocation AliasLoc, 6377 IdentifierInfo *Alias, 6378 CXXScopeSpec &SS, 6379 SourceLocation IdentLoc, 6380 IdentifierInfo *Ident) { 6381 6382 // Lookup the namespace name. 6383 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6384 LookupParsedName(R, S, &SS); 6385 6386 // Check if we have a previous declaration with the same name. 6387 NamedDecl *PrevDecl 6388 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6389 ForRedeclaration); 6390 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6391 PrevDecl = 0; 6392 6393 if (PrevDecl) { 6394 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6395 // We already have an alias with the same name that points to the same 6396 // namespace, so don't create a new one. 6397 // FIXME: At some point, we'll want to create the (redundant) 6398 // declaration to maintain better source information. 6399 if (!R.isAmbiguous() && !R.empty() && 6400 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6401 return 0; 6402 } 6403 6404 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6405 diag::err_redefinition_different_kind; 6406 Diag(AliasLoc, DiagID) << Alias; 6407 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6408 return 0; 6409 } 6410 6411 if (R.isAmbiguous()) 6412 return 0; 6413 6414 if (R.empty()) { 6415 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6416 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6417 return 0; 6418 } 6419 } 6420 6421 NamespaceAliasDecl *AliasDecl = 6422 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6423 Alias, SS.getWithLocInContext(Context), 6424 IdentLoc, R.getFoundDecl()); 6425 6426 PushOnScopeChains(AliasDecl, S); 6427 return AliasDecl; 6428} 6429 6430namespace { 6431 /// \brief Scoped object used to handle the state changes required in Sema 6432 /// to implicitly define the body of a C++ member function; 6433 class ImplicitlyDefinedFunctionScope { 6434 Sema &S; 6435 Sema::ContextRAII SavedContext; 6436 6437 public: 6438 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6439 : S(S), SavedContext(S, Method) 6440 { 6441 S.PushFunctionScope(); 6442 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6443 } 6444 6445 ~ImplicitlyDefinedFunctionScope() { 6446 S.PopExpressionEvaluationContext(); 6447 S.PopFunctionOrBlockScope(); 6448 } 6449 }; 6450} 6451 6452Sema::ImplicitExceptionSpecification 6453Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6454 // C++ [except.spec]p14: 6455 // An implicitly declared special member function (Clause 12) shall have an 6456 // exception-specification. [...] 6457 ImplicitExceptionSpecification ExceptSpec(Context); 6458 if (ClassDecl->isInvalidDecl()) 6459 return ExceptSpec; 6460 6461 // Direct base-class constructors. 6462 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6463 BEnd = ClassDecl->bases_end(); 6464 B != BEnd; ++B) { 6465 if (B->isVirtual()) // Handled below. 6466 continue; 6467 6468 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6469 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6470 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6471 // If this is a deleted function, add it anyway. This might be conformant 6472 // with the standard. This might not. I'm not sure. It might not matter. 6473 if (Constructor) 6474 ExceptSpec.CalledDecl(Constructor); 6475 } 6476 } 6477 6478 // Virtual base-class constructors. 6479 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6480 BEnd = ClassDecl->vbases_end(); 6481 B != BEnd; ++B) { 6482 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6483 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6484 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6485 // If this is a deleted function, add it anyway. This might be conformant 6486 // with the standard. This might not. I'm not sure. It might not matter. 6487 if (Constructor) 6488 ExceptSpec.CalledDecl(Constructor); 6489 } 6490 } 6491 6492 // Field constructors. 6493 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6494 FEnd = ClassDecl->field_end(); 6495 F != FEnd; ++F) { 6496 if (F->hasInClassInitializer()) { 6497 if (Expr *E = F->getInClassInitializer()) 6498 ExceptSpec.CalledExpr(E); 6499 else if (!F->isInvalidDecl()) 6500 ExceptSpec.SetDelayed(); 6501 } else if (const RecordType *RecordTy 6502 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6503 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6504 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6505 // If this is a deleted function, add it anyway. This might be conformant 6506 // with the standard. This might not. I'm not sure. It might not matter. 6507 // In particular, the problem is that this function never gets called. It 6508 // might just be ill-formed because this function attempts to refer to 6509 // a deleted function here. 6510 if (Constructor) 6511 ExceptSpec.CalledDecl(Constructor); 6512 } 6513 } 6514 6515 return ExceptSpec; 6516} 6517 6518CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6519 CXXRecordDecl *ClassDecl) { 6520 // C++ [class.ctor]p5: 6521 // A default constructor for a class X is a constructor of class X 6522 // that can be called without an argument. If there is no 6523 // user-declared constructor for class X, a default constructor is 6524 // implicitly declared. An implicitly-declared default constructor 6525 // is an inline public member of its class. 6526 assert(!ClassDecl->hasUserDeclaredConstructor() && 6527 "Should not build implicit default constructor!"); 6528 6529 ImplicitExceptionSpecification Spec = 6530 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6531 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6532 6533 // Create the actual constructor declaration. 6534 CanQualType ClassType 6535 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6536 SourceLocation ClassLoc = ClassDecl->getLocation(); 6537 DeclarationName Name 6538 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6539 DeclarationNameInfo NameInfo(Name, ClassLoc); 6540 CXXConstructorDecl *DefaultCon 6541 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6542 Context.getFunctionType(Context.VoidTy, 6543 0, 0, EPI), 6544 /*TInfo=*/0, 6545 /*isExplicit=*/false, 6546 /*isInline=*/true, 6547 /*isImplicitlyDeclared=*/true, 6548 // FIXME: apply the rules for definitions here 6549 /*isConstexpr=*/false); 6550 DefaultCon->setAccess(AS_public); 6551 DefaultCon->setDefaulted(); 6552 DefaultCon->setImplicit(); 6553 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6554 6555 // Note that we have declared this constructor. 6556 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6557 6558 if (Scope *S = getScopeForContext(ClassDecl)) 6559 PushOnScopeChains(DefaultCon, S, false); 6560 ClassDecl->addDecl(DefaultCon); 6561 6562 if (ShouldDeleteDefaultConstructor(DefaultCon)) 6563 DefaultCon->setDeletedAsWritten(); 6564 6565 return DefaultCon; 6566} 6567 6568void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6569 CXXConstructorDecl *Constructor) { 6570 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6571 !Constructor->doesThisDeclarationHaveABody() && 6572 !Constructor->isDeleted()) && 6573 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6574 6575 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6576 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6577 6578 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6579 DiagnosticErrorTrap Trap(Diags); 6580 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6581 Trap.hasErrorOccurred()) { 6582 Diag(CurrentLocation, diag::note_member_synthesized_at) 6583 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6584 Constructor->setInvalidDecl(); 6585 return; 6586 } 6587 6588 SourceLocation Loc = Constructor->getLocation(); 6589 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6590 6591 Constructor->setUsed(); 6592 MarkVTableUsed(CurrentLocation, ClassDecl); 6593 6594 if (ASTMutationListener *L = getASTMutationListener()) { 6595 L->CompletedImplicitDefinition(Constructor); 6596 } 6597} 6598 6599/// Get any existing defaulted default constructor for the given class. Do not 6600/// implicitly define one if it does not exist. 6601static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6602 CXXRecordDecl *D) { 6603 ASTContext &Context = Self.Context; 6604 QualType ClassType = Context.getTypeDeclType(D); 6605 DeclarationName ConstructorName 6606 = Context.DeclarationNames.getCXXConstructorName( 6607 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6608 6609 DeclContext::lookup_const_iterator Con, ConEnd; 6610 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6611 Con != ConEnd; ++Con) { 6612 // A function template cannot be defaulted. 6613 if (isa<FunctionTemplateDecl>(*Con)) 6614 continue; 6615 6616 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6617 if (Constructor->isDefaultConstructor()) 6618 return Constructor->isDefaulted() ? Constructor : 0; 6619 } 6620 return 0; 6621} 6622 6623void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6624 if (!D) return; 6625 AdjustDeclIfTemplate(D); 6626 6627 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6628 CXXConstructorDecl *CtorDecl 6629 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6630 6631 if (!CtorDecl) return; 6632 6633 // Compute the exception specification for the default constructor. 6634 const FunctionProtoType *CtorTy = 6635 CtorDecl->getType()->castAs<FunctionProtoType>(); 6636 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6637 ImplicitExceptionSpecification Spec = 6638 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6639 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6640 assert(EPI.ExceptionSpecType != EST_Delayed); 6641 6642 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6643 } 6644 6645 // If the default constructor is explicitly defaulted, checking the exception 6646 // specification is deferred until now. 6647 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6648 !ClassDecl->isDependentType()) 6649 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6650} 6651 6652void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6653 // We start with an initial pass over the base classes to collect those that 6654 // inherit constructors from. If there are none, we can forgo all further 6655 // processing. 6656 typedef SmallVector<const RecordType *, 4> BasesVector; 6657 BasesVector BasesToInheritFrom; 6658 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6659 BaseE = ClassDecl->bases_end(); 6660 BaseIt != BaseE; ++BaseIt) { 6661 if (BaseIt->getInheritConstructors()) { 6662 QualType Base = BaseIt->getType(); 6663 if (Base->isDependentType()) { 6664 // If we inherit constructors from anything that is dependent, just 6665 // abort processing altogether. We'll get another chance for the 6666 // instantiations. 6667 return; 6668 } 6669 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6670 } 6671 } 6672 if (BasesToInheritFrom.empty()) 6673 return; 6674 6675 // Now collect the constructors that we already have in the current class. 6676 // Those take precedence over inherited constructors. 6677 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6678 // unless there is a user-declared constructor with the same signature in 6679 // the class where the using-declaration appears. 6680 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6681 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6682 CtorE = ClassDecl->ctor_end(); 6683 CtorIt != CtorE; ++CtorIt) { 6684 ExistingConstructors.insert( 6685 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6686 } 6687 6688 Scope *S = getScopeForContext(ClassDecl); 6689 DeclarationName CreatedCtorName = 6690 Context.DeclarationNames.getCXXConstructorName( 6691 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6692 6693 // Now comes the true work. 6694 // First, we keep a map from constructor types to the base that introduced 6695 // them. Needed for finding conflicting constructors. We also keep the 6696 // actually inserted declarations in there, for pretty diagnostics. 6697 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6698 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6699 ConstructorToSourceMap InheritedConstructors; 6700 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6701 BaseE = BasesToInheritFrom.end(); 6702 BaseIt != BaseE; ++BaseIt) { 6703 const RecordType *Base = *BaseIt; 6704 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6705 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6706 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6707 CtorE = BaseDecl->ctor_end(); 6708 CtorIt != CtorE; ++CtorIt) { 6709 // Find the using declaration for inheriting this base's constructors. 6710 DeclarationName Name = 6711 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6712 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6713 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6714 SourceLocation UsingLoc = UD ? UD->getLocation() : 6715 ClassDecl->getLocation(); 6716 6717 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6718 // from the class X named in the using-declaration consists of actual 6719 // constructors and notional constructors that result from the 6720 // transformation of defaulted parameters as follows: 6721 // - all non-template default constructors of X, and 6722 // - for each non-template constructor of X that has at least one 6723 // parameter with a default argument, the set of constructors that 6724 // results from omitting any ellipsis parameter specification and 6725 // successively omitting parameters with a default argument from the 6726 // end of the parameter-type-list. 6727 CXXConstructorDecl *BaseCtor = *CtorIt; 6728 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6729 const FunctionProtoType *BaseCtorType = 6730 BaseCtor->getType()->getAs<FunctionProtoType>(); 6731 6732 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6733 maxParams = BaseCtor->getNumParams(); 6734 params <= maxParams; ++params) { 6735 // Skip default constructors. They're never inherited. 6736 if (params == 0) 6737 continue; 6738 // Skip copy and move constructors for the same reason. 6739 if (CanBeCopyOrMove && params == 1) 6740 continue; 6741 6742 // Build up a function type for this particular constructor. 6743 // FIXME: The working paper does not consider that the exception spec 6744 // for the inheriting constructor might be larger than that of the 6745 // source. This code doesn't yet, either. When it does, this code will 6746 // need to be delayed until after exception specifications and in-class 6747 // member initializers are attached. 6748 const Type *NewCtorType; 6749 if (params == maxParams) 6750 NewCtorType = BaseCtorType; 6751 else { 6752 SmallVector<QualType, 16> Args; 6753 for (unsigned i = 0; i < params; ++i) { 6754 Args.push_back(BaseCtorType->getArgType(i)); 6755 } 6756 FunctionProtoType::ExtProtoInfo ExtInfo = 6757 BaseCtorType->getExtProtoInfo(); 6758 ExtInfo.Variadic = false; 6759 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6760 Args.data(), params, ExtInfo) 6761 .getTypePtr(); 6762 } 6763 const Type *CanonicalNewCtorType = 6764 Context.getCanonicalType(NewCtorType); 6765 6766 // Now that we have the type, first check if the class already has a 6767 // constructor with this signature. 6768 if (ExistingConstructors.count(CanonicalNewCtorType)) 6769 continue; 6770 6771 // Then we check if we have already declared an inherited constructor 6772 // with this signature. 6773 std::pair<ConstructorToSourceMap::iterator, bool> result = 6774 InheritedConstructors.insert(std::make_pair( 6775 CanonicalNewCtorType, 6776 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6777 if (!result.second) { 6778 // Already in the map. If it came from a different class, that's an 6779 // error. Not if it's from the same. 6780 CanQualType PreviousBase = result.first->second.first; 6781 if (CanonicalBase != PreviousBase) { 6782 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6783 const CXXConstructorDecl *PrevBaseCtor = 6784 PrevCtor->getInheritedConstructor(); 6785 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6786 6787 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6788 Diag(BaseCtor->getLocation(), 6789 diag::note_using_decl_constructor_conflict_current_ctor); 6790 Diag(PrevBaseCtor->getLocation(), 6791 diag::note_using_decl_constructor_conflict_previous_ctor); 6792 Diag(PrevCtor->getLocation(), 6793 diag::note_using_decl_constructor_conflict_previous_using); 6794 } 6795 continue; 6796 } 6797 6798 // OK, we're there, now add the constructor. 6799 // C++0x [class.inhctor]p8: [...] that would be performed by a 6800 // user-written inline constructor [...] 6801 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6802 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6803 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6804 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6805 /*ImplicitlyDeclared=*/true, 6806 // FIXME: Due to a defect in the standard, we treat inherited 6807 // constructors as constexpr even if that makes them ill-formed. 6808 /*Constexpr=*/BaseCtor->isConstexpr()); 6809 NewCtor->setAccess(BaseCtor->getAccess()); 6810 6811 // Build up the parameter decls and add them. 6812 SmallVector<ParmVarDecl *, 16> ParamDecls; 6813 for (unsigned i = 0; i < params; ++i) { 6814 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 6815 UsingLoc, UsingLoc, 6816 /*IdentifierInfo=*/0, 6817 BaseCtorType->getArgType(i), 6818 /*TInfo=*/0, SC_None, 6819 SC_None, /*DefaultArg=*/0)); 6820 } 6821 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 6822 NewCtor->setInheritedConstructor(BaseCtor); 6823 6824 PushOnScopeChains(NewCtor, S, false); 6825 ClassDecl->addDecl(NewCtor); 6826 result.first->second.second = NewCtor; 6827 } 6828 } 6829 } 6830} 6831 6832Sema::ImplicitExceptionSpecification 6833Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6834 // C++ [except.spec]p14: 6835 // An implicitly declared special member function (Clause 12) shall have 6836 // an exception-specification. 6837 ImplicitExceptionSpecification ExceptSpec(Context); 6838 if (ClassDecl->isInvalidDecl()) 6839 return ExceptSpec; 6840 6841 // Direct base-class destructors. 6842 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6843 BEnd = ClassDecl->bases_end(); 6844 B != BEnd; ++B) { 6845 if (B->isVirtual()) // Handled below. 6846 continue; 6847 6848 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6849 ExceptSpec.CalledDecl( 6850 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6851 } 6852 6853 // Virtual base-class destructors. 6854 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6855 BEnd = ClassDecl->vbases_end(); 6856 B != BEnd; ++B) { 6857 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6858 ExceptSpec.CalledDecl( 6859 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6860 } 6861 6862 // Field destructors. 6863 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6864 FEnd = ClassDecl->field_end(); 6865 F != FEnd; ++F) { 6866 if (const RecordType *RecordTy 6867 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 6868 ExceptSpec.CalledDecl( 6869 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 6870 } 6871 6872 return ExceptSpec; 6873} 6874 6875CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 6876 // C++ [class.dtor]p2: 6877 // If a class has no user-declared destructor, a destructor is 6878 // declared implicitly. An implicitly-declared destructor is an 6879 // inline public member of its class. 6880 6881 ImplicitExceptionSpecification Spec = 6882 ComputeDefaultedDtorExceptionSpec(ClassDecl); 6883 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6884 6885 // Create the actual destructor declaration. 6886 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 6887 6888 CanQualType ClassType 6889 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6890 SourceLocation ClassLoc = ClassDecl->getLocation(); 6891 DeclarationName Name 6892 = Context.DeclarationNames.getCXXDestructorName(ClassType); 6893 DeclarationNameInfo NameInfo(Name, ClassLoc); 6894 CXXDestructorDecl *Destructor 6895 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 6896 /*isInline=*/true, 6897 /*isImplicitlyDeclared=*/true); 6898 Destructor->setAccess(AS_public); 6899 Destructor->setDefaulted(); 6900 Destructor->setImplicit(); 6901 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 6902 6903 // Note that we have declared this destructor. 6904 ++ASTContext::NumImplicitDestructorsDeclared; 6905 6906 // Introduce this destructor into its scope. 6907 if (Scope *S = getScopeForContext(ClassDecl)) 6908 PushOnScopeChains(Destructor, S, false); 6909 ClassDecl->addDecl(Destructor); 6910 6911 // This could be uniqued if it ever proves significant. 6912 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 6913 6914 if (ShouldDeleteDestructor(Destructor)) 6915 Destructor->setDeletedAsWritten(); 6916 6917 AddOverriddenMethods(ClassDecl, Destructor); 6918 6919 return Destructor; 6920} 6921 6922void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 6923 CXXDestructorDecl *Destructor) { 6924 assert((Destructor->isDefaulted() && 6925 !Destructor->doesThisDeclarationHaveABody()) && 6926 "DefineImplicitDestructor - call it for implicit default dtor"); 6927 CXXRecordDecl *ClassDecl = Destructor->getParent(); 6928 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 6929 6930 if (Destructor->isInvalidDecl()) 6931 return; 6932 6933 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 6934 6935 DiagnosticErrorTrap Trap(Diags); 6936 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6937 Destructor->getParent()); 6938 6939 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 6940 Diag(CurrentLocation, diag::note_member_synthesized_at) 6941 << CXXDestructor << Context.getTagDeclType(ClassDecl); 6942 6943 Destructor->setInvalidDecl(); 6944 return; 6945 } 6946 6947 SourceLocation Loc = Destructor->getLocation(); 6948 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6949 6950 Destructor->setUsed(); 6951 MarkVTableUsed(CurrentLocation, ClassDecl); 6952 6953 if (ASTMutationListener *L = getASTMutationListener()) { 6954 L->CompletedImplicitDefinition(Destructor); 6955 } 6956} 6957 6958void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 6959 CXXDestructorDecl *destructor) { 6960 // C++11 [class.dtor]p3: 6961 // A declaration of a destructor that does not have an exception- 6962 // specification is implicitly considered to have the same exception- 6963 // specification as an implicit declaration. 6964 const FunctionProtoType *dtorType = destructor->getType()-> 6965 getAs<FunctionProtoType>(); 6966 if (dtorType->hasExceptionSpec()) 6967 return; 6968 6969 ImplicitExceptionSpecification exceptSpec = 6970 ComputeDefaultedDtorExceptionSpec(classDecl); 6971 6972 // Replace the destructor's type. 6973 FunctionProtoType::ExtProtoInfo epi; 6974 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 6975 epi.NumExceptions = exceptSpec.size(); 6976 epi.Exceptions = exceptSpec.data(); 6977 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 6978 6979 destructor->setType(ty); 6980 6981 // FIXME: If the destructor has a body that could throw, and the newly created 6982 // spec doesn't allow exceptions, we should emit a warning, because this 6983 // change in behavior can break conforming C++03 programs at runtime. 6984 // However, we don't have a body yet, so it needs to be done somewhere else. 6985} 6986 6987/// \brief Builds a statement that copies/moves the given entity from \p From to 6988/// \c To. 6989/// 6990/// This routine is used to copy/move the members of a class with an 6991/// implicitly-declared copy/move assignment operator. When the entities being 6992/// copied are arrays, this routine builds for loops to copy them. 6993/// 6994/// \param S The Sema object used for type-checking. 6995/// 6996/// \param Loc The location where the implicit copy/move is being generated. 6997/// 6998/// \param T The type of the expressions being copied/moved. Both expressions 6999/// must have this type. 7000/// 7001/// \param To The expression we are copying/moving to. 7002/// 7003/// \param From The expression we are copying/moving from. 7004/// 7005/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7006/// Otherwise, it's a non-static member subobject. 7007/// 7008/// \param Copying Whether we're copying or moving. 7009/// 7010/// \param Depth Internal parameter recording the depth of the recursion. 7011/// 7012/// \returns A statement or a loop that copies the expressions. 7013static StmtResult 7014BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7015 Expr *To, Expr *From, 7016 bool CopyingBaseSubobject, bool Copying, 7017 unsigned Depth = 0) { 7018 // C++0x [class.copy]p28: 7019 // Each subobject is assigned in the manner appropriate to its type: 7020 // 7021 // - if the subobject is of class type, as if by a call to operator= with 7022 // the subobject as the object expression and the corresponding 7023 // subobject of x as a single function argument (as if by explicit 7024 // qualification; that is, ignoring any possible virtual overriding 7025 // functions in more derived classes); 7026 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7027 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7028 7029 // Look for operator=. 7030 DeclarationName Name 7031 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7032 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7033 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7034 7035 // Filter out any result that isn't a copy/move-assignment operator. 7036 LookupResult::Filter F = OpLookup.makeFilter(); 7037 while (F.hasNext()) { 7038 NamedDecl *D = F.next(); 7039 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7040 if (Copying ? Method->isCopyAssignmentOperator() : 7041 Method->isMoveAssignmentOperator()) 7042 continue; 7043 7044 F.erase(); 7045 } 7046 F.done(); 7047 7048 // Suppress the protected check (C++ [class.protected]) for each of the 7049 // assignment operators we found. This strange dance is required when 7050 // we're assigning via a base classes's copy-assignment operator. To 7051 // ensure that we're getting the right base class subobject (without 7052 // ambiguities), we need to cast "this" to that subobject type; to 7053 // ensure that we don't go through the virtual call mechanism, we need 7054 // to qualify the operator= name with the base class (see below). However, 7055 // this means that if the base class has a protected copy assignment 7056 // operator, the protected member access check will fail. So, we 7057 // rewrite "protected" access to "public" access in this case, since we 7058 // know by construction that we're calling from a derived class. 7059 if (CopyingBaseSubobject) { 7060 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7061 L != LEnd; ++L) { 7062 if (L.getAccess() == AS_protected) 7063 L.setAccess(AS_public); 7064 } 7065 } 7066 7067 // Create the nested-name-specifier that will be used to qualify the 7068 // reference to operator=; this is required to suppress the virtual 7069 // call mechanism. 7070 CXXScopeSpec SS; 7071 SS.MakeTrivial(S.Context, 7072 NestedNameSpecifier::Create(S.Context, 0, false, 7073 T.getTypePtr()), 7074 Loc); 7075 7076 // Create the reference to operator=. 7077 ExprResult OpEqualRef 7078 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7079 /*FirstQualifierInScope=*/0, OpLookup, 7080 /*TemplateArgs=*/0, 7081 /*SuppressQualifierCheck=*/true); 7082 if (OpEqualRef.isInvalid()) 7083 return StmtError(); 7084 7085 // Build the call to the assignment operator. 7086 7087 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7088 OpEqualRef.takeAs<Expr>(), 7089 Loc, &From, 1, Loc); 7090 if (Call.isInvalid()) 7091 return StmtError(); 7092 7093 return S.Owned(Call.takeAs<Stmt>()); 7094 } 7095 7096 // - if the subobject is of scalar type, the built-in assignment 7097 // operator is used. 7098 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7099 if (!ArrayTy) { 7100 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7101 if (Assignment.isInvalid()) 7102 return StmtError(); 7103 7104 return S.Owned(Assignment.takeAs<Stmt>()); 7105 } 7106 7107 // - if the subobject is an array, each element is assigned, in the 7108 // manner appropriate to the element type; 7109 7110 // Construct a loop over the array bounds, e.g., 7111 // 7112 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7113 // 7114 // that will copy each of the array elements. 7115 QualType SizeType = S.Context.getSizeType(); 7116 7117 // Create the iteration variable. 7118 IdentifierInfo *IterationVarName = 0; 7119 { 7120 llvm::SmallString<8> Str; 7121 llvm::raw_svector_ostream OS(Str); 7122 OS << "__i" << Depth; 7123 IterationVarName = &S.Context.Idents.get(OS.str()); 7124 } 7125 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7126 IterationVarName, SizeType, 7127 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7128 SC_None, SC_None); 7129 7130 // Initialize the iteration variable to zero. 7131 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7132 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7133 7134 // Create a reference to the iteration variable; we'll use this several 7135 // times throughout. 7136 Expr *IterationVarRef 7137 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7138 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7139 7140 // Create the DeclStmt that holds the iteration variable. 7141 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7142 7143 // Create the comparison against the array bound. 7144 llvm::APInt Upper 7145 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7146 Expr *Comparison 7147 = new (S.Context) BinaryOperator(IterationVarRef, 7148 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7149 BO_NE, S.Context.BoolTy, 7150 VK_RValue, OK_Ordinary, Loc); 7151 7152 // Create the pre-increment of the iteration variable. 7153 Expr *Increment 7154 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7155 VK_LValue, OK_Ordinary, Loc); 7156 7157 // Subscript the "from" and "to" expressions with the iteration variable. 7158 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7159 IterationVarRef, Loc)); 7160 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7161 IterationVarRef, Loc)); 7162 if (!Copying) // Cast to rvalue 7163 From = CastForMoving(S, From); 7164 7165 // Build the copy/move for an individual element of the array. 7166 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7167 To, From, CopyingBaseSubobject, 7168 Copying, Depth + 1); 7169 if (Copy.isInvalid()) 7170 return StmtError(); 7171 7172 // Construct the loop that copies all elements of this array. 7173 return S.ActOnForStmt(Loc, Loc, InitStmt, 7174 S.MakeFullExpr(Comparison), 7175 0, S.MakeFullExpr(Increment), 7176 Loc, Copy.take()); 7177} 7178 7179std::pair<Sema::ImplicitExceptionSpecification, bool> 7180Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7181 CXXRecordDecl *ClassDecl) { 7182 if (ClassDecl->isInvalidDecl()) 7183 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7184 7185 // C++ [class.copy]p10: 7186 // If the class definition does not explicitly declare a copy 7187 // assignment operator, one is declared implicitly. 7188 // The implicitly-defined copy assignment operator for a class X 7189 // will have the form 7190 // 7191 // X& X::operator=(const X&) 7192 // 7193 // if 7194 bool HasConstCopyAssignment = true; 7195 7196 // -- each direct base class B of X has a copy assignment operator 7197 // whose parameter is of type const B&, const volatile B& or B, 7198 // and 7199 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7200 BaseEnd = ClassDecl->bases_end(); 7201 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7202 // We'll handle this below 7203 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7204 continue; 7205 7206 assert(!Base->getType()->isDependentType() && 7207 "Cannot generate implicit members for class with dependent bases."); 7208 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7209 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7210 &HasConstCopyAssignment); 7211 } 7212 7213 // In C++0x, the above citation has "or virtual added" 7214 if (LangOpts.CPlusPlus0x) { 7215 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7216 BaseEnd = ClassDecl->vbases_end(); 7217 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7218 assert(!Base->getType()->isDependentType() && 7219 "Cannot generate implicit members for class with dependent bases."); 7220 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7221 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7222 &HasConstCopyAssignment); 7223 } 7224 } 7225 7226 // -- for all the nonstatic data members of X that are of a class 7227 // type M (or array thereof), each such class type has a copy 7228 // assignment operator whose parameter is of type const M&, 7229 // const volatile M& or M. 7230 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7231 FieldEnd = ClassDecl->field_end(); 7232 HasConstCopyAssignment && Field != FieldEnd; 7233 ++Field) { 7234 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7235 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7236 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7237 &HasConstCopyAssignment); 7238 } 7239 } 7240 7241 // Otherwise, the implicitly declared copy assignment operator will 7242 // have the form 7243 // 7244 // X& X::operator=(X&) 7245 7246 // C++ [except.spec]p14: 7247 // An implicitly declared special member function (Clause 12) shall have an 7248 // exception-specification. [...] 7249 7250 // It is unspecified whether or not an implicit copy assignment operator 7251 // attempts to deduplicate calls to assignment operators of virtual bases are 7252 // made. As such, this exception specification is effectively unspecified. 7253 // Based on a similar decision made for constness in C++0x, we're erring on 7254 // the side of assuming such calls to be made regardless of whether they 7255 // actually happen. 7256 ImplicitExceptionSpecification ExceptSpec(Context); 7257 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7258 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7259 BaseEnd = ClassDecl->bases_end(); 7260 Base != BaseEnd; ++Base) { 7261 if (Base->isVirtual()) 7262 continue; 7263 7264 CXXRecordDecl *BaseClassDecl 7265 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7266 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7267 ArgQuals, false, 0)) 7268 ExceptSpec.CalledDecl(CopyAssign); 7269 } 7270 7271 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7272 BaseEnd = ClassDecl->vbases_end(); 7273 Base != BaseEnd; ++Base) { 7274 CXXRecordDecl *BaseClassDecl 7275 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7276 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7277 ArgQuals, false, 0)) 7278 ExceptSpec.CalledDecl(CopyAssign); 7279 } 7280 7281 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7282 FieldEnd = ClassDecl->field_end(); 7283 Field != FieldEnd; 7284 ++Field) { 7285 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7286 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7287 if (CXXMethodDecl *CopyAssign = 7288 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7289 ExceptSpec.CalledDecl(CopyAssign); 7290 } 7291 } 7292 7293 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7294} 7295 7296CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7297 // Note: The following rules are largely analoguous to the copy 7298 // constructor rules. Note that virtual bases are not taken into account 7299 // for determining the argument type of the operator. Note also that 7300 // operators taking an object instead of a reference are allowed. 7301 7302 ImplicitExceptionSpecification Spec(Context); 7303 bool Const; 7304 llvm::tie(Spec, Const) = 7305 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7306 7307 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7308 QualType RetType = Context.getLValueReferenceType(ArgType); 7309 if (Const) 7310 ArgType = ArgType.withConst(); 7311 ArgType = Context.getLValueReferenceType(ArgType); 7312 7313 // An implicitly-declared copy assignment operator is an inline public 7314 // member of its class. 7315 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7316 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7317 SourceLocation ClassLoc = ClassDecl->getLocation(); 7318 DeclarationNameInfo NameInfo(Name, ClassLoc); 7319 CXXMethodDecl *CopyAssignment 7320 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7321 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7322 /*TInfo=*/0, /*isStatic=*/false, 7323 /*StorageClassAsWritten=*/SC_None, 7324 /*isInline=*/true, /*isConstexpr=*/false, 7325 SourceLocation()); 7326 CopyAssignment->setAccess(AS_public); 7327 CopyAssignment->setDefaulted(); 7328 CopyAssignment->setImplicit(); 7329 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7330 7331 // Add the parameter to the operator. 7332 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7333 ClassLoc, ClassLoc, /*Id=*/0, 7334 ArgType, /*TInfo=*/0, 7335 SC_None, 7336 SC_None, 0); 7337 CopyAssignment->setParams(&FromParam, 1); 7338 7339 // Note that we have added this copy-assignment operator. 7340 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7341 7342 if (Scope *S = getScopeForContext(ClassDecl)) 7343 PushOnScopeChains(CopyAssignment, S, false); 7344 ClassDecl->addDecl(CopyAssignment); 7345 7346 // C++0x [class.copy]p18: 7347 // ... If the class definition declares a move constructor or move 7348 // assignment operator, the implicitly declared copy assignment operator is 7349 // defined as deleted; ... 7350 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7351 ClassDecl->hasUserDeclaredMoveAssignment() || 7352 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7353 CopyAssignment->setDeletedAsWritten(); 7354 7355 AddOverriddenMethods(ClassDecl, CopyAssignment); 7356 return CopyAssignment; 7357} 7358 7359void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7360 CXXMethodDecl *CopyAssignOperator) { 7361 assert((CopyAssignOperator->isDefaulted() && 7362 CopyAssignOperator->isOverloadedOperator() && 7363 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7364 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7365 "DefineImplicitCopyAssignment called for wrong function"); 7366 7367 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7368 7369 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7370 CopyAssignOperator->setInvalidDecl(); 7371 return; 7372 } 7373 7374 CopyAssignOperator->setUsed(); 7375 7376 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7377 DiagnosticErrorTrap Trap(Diags); 7378 7379 // C++0x [class.copy]p30: 7380 // The implicitly-defined or explicitly-defaulted copy assignment operator 7381 // for a non-union class X performs memberwise copy assignment of its 7382 // subobjects. The direct base classes of X are assigned first, in the 7383 // order of their declaration in the base-specifier-list, and then the 7384 // immediate non-static data members of X are assigned, in the order in 7385 // which they were declared in the class definition. 7386 7387 // The statements that form the synthesized function body. 7388 ASTOwningVector<Stmt*> Statements(*this); 7389 7390 // The parameter for the "other" object, which we are copying from. 7391 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7392 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7393 QualType OtherRefType = Other->getType(); 7394 if (const LValueReferenceType *OtherRef 7395 = OtherRefType->getAs<LValueReferenceType>()) { 7396 OtherRefType = OtherRef->getPointeeType(); 7397 OtherQuals = OtherRefType.getQualifiers(); 7398 } 7399 7400 // Our location for everything implicitly-generated. 7401 SourceLocation Loc = CopyAssignOperator->getLocation(); 7402 7403 // Construct a reference to the "other" object. We'll be using this 7404 // throughout the generated ASTs. 7405 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7406 assert(OtherRef && "Reference to parameter cannot fail!"); 7407 7408 // Construct the "this" pointer. We'll be using this throughout the generated 7409 // ASTs. 7410 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7411 assert(This && "Reference to this cannot fail!"); 7412 7413 // Assign base classes. 7414 bool Invalid = false; 7415 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7416 E = ClassDecl->bases_end(); Base != E; ++Base) { 7417 // Form the assignment: 7418 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7419 QualType BaseType = Base->getType().getUnqualifiedType(); 7420 if (!BaseType->isRecordType()) { 7421 Invalid = true; 7422 continue; 7423 } 7424 7425 CXXCastPath BasePath; 7426 BasePath.push_back(Base); 7427 7428 // Construct the "from" expression, which is an implicit cast to the 7429 // appropriately-qualified base type. 7430 Expr *From = OtherRef; 7431 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7432 CK_UncheckedDerivedToBase, 7433 VK_LValue, &BasePath).take(); 7434 7435 // Dereference "this". 7436 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7437 7438 // Implicitly cast "this" to the appropriately-qualified base type. 7439 To = ImpCastExprToType(To.take(), 7440 Context.getCVRQualifiedType(BaseType, 7441 CopyAssignOperator->getTypeQualifiers()), 7442 CK_UncheckedDerivedToBase, 7443 VK_LValue, &BasePath); 7444 7445 // Build the copy. 7446 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7447 To.get(), From, 7448 /*CopyingBaseSubobject=*/true, 7449 /*Copying=*/true); 7450 if (Copy.isInvalid()) { 7451 Diag(CurrentLocation, diag::note_member_synthesized_at) 7452 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7453 CopyAssignOperator->setInvalidDecl(); 7454 return; 7455 } 7456 7457 // Success! Record the copy. 7458 Statements.push_back(Copy.takeAs<Expr>()); 7459 } 7460 7461 // \brief Reference to the __builtin_memcpy function. 7462 Expr *BuiltinMemCpyRef = 0; 7463 // \brief Reference to the __builtin_objc_memmove_collectable function. 7464 Expr *CollectableMemCpyRef = 0; 7465 7466 // Assign non-static members. 7467 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7468 FieldEnd = ClassDecl->field_end(); 7469 Field != FieldEnd; ++Field) { 7470 // Check for members of reference type; we can't copy those. 7471 if (Field->getType()->isReferenceType()) { 7472 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7473 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7474 Diag(Field->getLocation(), diag::note_declared_at); 7475 Diag(CurrentLocation, diag::note_member_synthesized_at) 7476 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7477 Invalid = true; 7478 continue; 7479 } 7480 7481 // Check for members of const-qualified, non-class type. 7482 QualType BaseType = Context.getBaseElementType(Field->getType()); 7483 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7484 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7485 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7486 Diag(Field->getLocation(), diag::note_declared_at); 7487 Diag(CurrentLocation, diag::note_member_synthesized_at) 7488 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7489 Invalid = true; 7490 continue; 7491 } 7492 7493 // Suppress assigning zero-width bitfields. 7494 if (const Expr *Width = Field->getBitWidth()) 7495 if (Width->EvaluateAsInt(Context) == 0) 7496 continue; 7497 7498 QualType FieldType = Field->getType().getNonReferenceType(); 7499 if (FieldType->isIncompleteArrayType()) { 7500 assert(ClassDecl->hasFlexibleArrayMember() && 7501 "Incomplete array type is not valid"); 7502 continue; 7503 } 7504 7505 // Build references to the field in the object we're copying from and to. 7506 CXXScopeSpec SS; // Intentionally empty 7507 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7508 LookupMemberName); 7509 MemberLookup.addDecl(*Field); 7510 MemberLookup.resolveKind(); 7511 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7512 Loc, /*IsArrow=*/false, 7513 SS, 0, MemberLookup, 0); 7514 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7515 Loc, /*IsArrow=*/true, 7516 SS, 0, MemberLookup, 0); 7517 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7518 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7519 7520 // If the field should be copied with __builtin_memcpy rather than via 7521 // explicit assignments, do so. This optimization only applies for arrays 7522 // of scalars and arrays of class type with trivial copy-assignment 7523 // operators. 7524 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7525 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7526 // Compute the size of the memory buffer to be copied. 7527 QualType SizeType = Context.getSizeType(); 7528 llvm::APInt Size(Context.getTypeSize(SizeType), 7529 Context.getTypeSizeInChars(BaseType).getQuantity()); 7530 for (const ConstantArrayType *Array 7531 = Context.getAsConstantArrayType(FieldType); 7532 Array; 7533 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7534 llvm::APInt ArraySize 7535 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7536 Size *= ArraySize; 7537 } 7538 7539 // Take the address of the field references for "from" and "to". 7540 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7541 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7542 7543 bool NeedsCollectableMemCpy = 7544 (BaseType->isRecordType() && 7545 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7546 7547 if (NeedsCollectableMemCpy) { 7548 if (!CollectableMemCpyRef) { 7549 // Create a reference to the __builtin_objc_memmove_collectable function. 7550 LookupResult R(*this, 7551 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7552 Loc, LookupOrdinaryName); 7553 LookupName(R, TUScope, true); 7554 7555 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7556 if (!CollectableMemCpy) { 7557 // Something went horribly wrong earlier, and we will have 7558 // complained about it. 7559 Invalid = true; 7560 continue; 7561 } 7562 7563 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7564 CollectableMemCpy->getType(), 7565 VK_LValue, Loc, 0).take(); 7566 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7567 } 7568 } 7569 // Create a reference to the __builtin_memcpy builtin function. 7570 else if (!BuiltinMemCpyRef) { 7571 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7572 LookupOrdinaryName); 7573 LookupName(R, TUScope, true); 7574 7575 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7576 if (!BuiltinMemCpy) { 7577 // Something went horribly wrong earlier, and we will have complained 7578 // about it. 7579 Invalid = true; 7580 continue; 7581 } 7582 7583 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7584 BuiltinMemCpy->getType(), 7585 VK_LValue, Loc, 0).take(); 7586 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7587 } 7588 7589 ASTOwningVector<Expr*> CallArgs(*this); 7590 CallArgs.push_back(To.takeAs<Expr>()); 7591 CallArgs.push_back(From.takeAs<Expr>()); 7592 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7593 ExprResult Call = ExprError(); 7594 if (NeedsCollectableMemCpy) 7595 Call = ActOnCallExpr(/*Scope=*/0, 7596 CollectableMemCpyRef, 7597 Loc, move_arg(CallArgs), 7598 Loc); 7599 else 7600 Call = ActOnCallExpr(/*Scope=*/0, 7601 BuiltinMemCpyRef, 7602 Loc, move_arg(CallArgs), 7603 Loc); 7604 7605 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7606 Statements.push_back(Call.takeAs<Expr>()); 7607 continue; 7608 } 7609 7610 // Build the copy of this field. 7611 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7612 To.get(), From.get(), 7613 /*CopyingBaseSubobject=*/false, 7614 /*Copying=*/true); 7615 if (Copy.isInvalid()) { 7616 Diag(CurrentLocation, diag::note_member_synthesized_at) 7617 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7618 CopyAssignOperator->setInvalidDecl(); 7619 return; 7620 } 7621 7622 // Success! Record the copy. 7623 Statements.push_back(Copy.takeAs<Stmt>()); 7624 } 7625 7626 if (!Invalid) { 7627 // Add a "return *this;" 7628 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7629 7630 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7631 if (Return.isInvalid()) 7632 Invalid = true; 7633 else { 7634 Statements.push_back(Return.takeAs<Stmt>()); 7635 7636 if (Trap.hasErrorOccurred()) { 7637 Diag(CurrentLocation, diag::note_member_synthesized_at) 7638 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7639 Invalid = true; 7640 } 7641 } 7642 } 7643 7644 if (Invalid) { 7645 CopyAssignOperator->setInvalidDecl(); 7646 return; 7647 } 7648 7649 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7650 /*isStmtExpr=*/false); 7651 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7652 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7653 7654 if (ASTMutationListener *L = getASTMutationListener()) { 7655 L->CompletedImplicitDefinition(CopyAssignOperator); 7656 } 7657} 7658 7659Sema::ImplicitExceptionSpecification 7660Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7661 ImplicitExceptionSpecification ExceptSpec(Context); 7662 7663 if (ClassDecl->isInvalidDecl()) 7664 return ExceptSpec; 7665 7666 // C++0x [except.spec]p14: 7667 // An implicitly declared special member function (Clause 12) shall have an 7668 // exception-specification. [...] 7669 7670 // It is unspecified whether or not an implicit move assignment operator 7671 // attempts to deduplicate calls to assignment operators of virtual bases are 7672 // made. As such, this exception specification is effectively unspecified. 7673 // Based on a similar decision made for constness in C++0x, we're erring on 7674 // the side of assuming such calls to be made regardless of whether they 7675 // actually happen. 7676 // Note that a move constructor is not implicitly declared when there are 7677 // virtual bases, but it can still be user-declared and explicitly defaulted. 7678 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7679 BaseEnd = ClassDecl->bases_end(); 7680 Base != BaseEnd; ++Base) { 7681 if (Base->isVirtual()) 7682 continue; 7683 7684 CXXRecordDecl *BaseClassDecl 7685 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7686 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7687 false, 0)) 7688 ExceptSpec.CalledDecl(MoveAssign); 7689 } 7690 7691 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7692 BaseEnd = ClassDecl->vbases_end(); 7693 Base != BaseEnd; ++Base) { 7694 CXXRecordDecl *BaseClassDecl 7695 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7696 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7697 false, 0)) 7698 ExceptSpec.CalledDecl(MoveAssign); 7699 } 7700 7701 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7702 FieldEnd = ClassDecl->field_end(); 7703 Field != FieldEnd; 7704 ++Field) { 7705 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7706 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7707 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7708 false, 0)) 7709 ExceptSpec.CalledDecl(MoveAssign); 7710 } 7711 } 7712 7713 return ExceptSpec; 7714} 7715 7716CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 7717 // Note: The following rules are largely analoguous to the move 7718 // constructor rules. 7719 7720 ImplicitExceptionSpecification Spec( 7721 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 7722 7723 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7724 QualType RetType = Context.getLValueReferenceType(ArgType); 7725 ArgType = Context.getRValueReferenceType(ArgType); 7726 7727 // An implicitly-declared move assignment operator is an inline public 7728 // member of its class. 7729 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7730 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7731 SourceLocation ClassLoc = ClassDecl->getLocation(); 7732 DeclarationNameInfo NameInfo(Name, ClassLoc); 7733 CXXMethodDecl *MoveAssignment 7734 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7735 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7736 /*TInfo=*/0, /*isStatic=*/false, 7737 /*StorageClassAsWritten=*/SC_None, 7738 /*isInline=*/true, 7739 /*isConstexpr=*/false, 7740 SourceLocation()); 7741 MoveAssignment->setAccess(AS_public); 7742 MoveAssignment->setDefaulted(); 7743 MoveAssignment->setImplicit(); 7744 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 7745 7746 // Add the parameter to the operator. 7747 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 7748 ClassLoc, ClassLoc, /*Id=*/0, 7749 ArgType, /*TInfo=*/0, 7750 SC_None, 7751 SC_None, 0); 7752 MoveAssignment->setParams(&FromParam, 1); 7753 7754 // Note that we have added this copy-assignment operator. 7755 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 7756 7757 // C++0x [class.copy]p9: 7758 // If the definition of a class X does not explicitly declare a move 7759 // assignment operator, one will be implicitly declared as defaulted if and 7760 // only if: 7761 // [...] 7762 // - the move assignment operator would not be implicitly defined as 7763 // deleted. 7764 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 7765 // Cache this result so that we don't try to generate this over and over 7766 // on every lookup, leaking memory and wasting time. 7767 ClassDecl->setFailedImplicitMoveAssignment(); 7768 return 0; 7769 } 7770 7771 if (Scope *S = getScopeForContext(ClassDecl)) 7772 PushOnScopeChains(MoveAssignment, S, false); 7773 ClassDecl->addDecl(MoveAssignment); 7774 7775 AddOverriddenMethods(ClassDecl, MoveAssignment); 7776 return MoveAssignment; 7777} 7778 7779void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 7780 CXXMethodDecl *MoveAssignOperator) { 7781 assert((MoveAssignOperator->isDefaulted() && 7782 MoveAssignOperator->isOverloadedOperator() && 7783 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 7784 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 7785 "DefineImplicitMoveAssignment called for wrong function"); 7786 7787 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 7788 7789 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 7790 MoveAssignOperator->setInvalidDecl(); 7791 return; 7792 } 7793 7794 MoveAssignOperator->setUsed(); 7795 7796 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 7797 DiagnosticErrorTrap Trap(Diags); 7798 7799 // C++0x [class.copy]p28: 7800 // The implicitly-defined or move assignment operator for a non-union class 7801 // X performs memberwise move assignment of its subobjects. The direct base 7802 // classes of X are assigned first, in the order of their declaration in the 7803 // base-specifier-list, and then the immediate non-static data members of X 7804 // are assigned, in the order in which they were declared in the class 7805 // definition. 7806 7807 // The statements that form the synthesized function body. 7808 ASTOwningVector<Stmt*> Statements(*this); 7809 7810 // The parameter for the "other" object, which we are move from. 7811 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 7812 QualType OtherRefType = Other->getType()-> 7813 getAs<RValueReferenceType>()->getPointeeType(); 7814 assert(OtherRefType.getQualifiers() == 0 && 7815 "Bad argument type of defaulted move assignment"); 7816 7817 // Our location for everything implicitly-generated. 7818 SourceLocation Loc = MoveAssignOperator->getLocation(); 7819 7820 // Construct a reference to the "other" object. We'll be using this 7821 // throughout the generated ASTs. 7822 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7823 assert(OtherRef && "Reference to parameter cannot fail!"); 7824 // Cast to rvalue. 7825 OtherRef = CastForMoving(*this, OtherRef); 7826 7827 // Construct the "this" pointer. We'll be using this throughout the generated 7828 // ASTs. 7829 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7830 assert(This && "Reference to this cannot fail!"); 7831 7832 // Assign base classes. 7833 bool Invalid = false; 7834 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7835 E = ClassDecl->bases_end(); Base != E; ++Base) { 7836 // Form the assignment: 7837 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 7838 QualType BaseType = Base->getType().getUnqualifiedType(); 7839 if (!BaseType->isRecordType()) { 7840 Invalid = true; 7841 continue; 7842 } 7843 7844 CXXCastPath BasePath; 7845 BasePath.push_back(Base); 7846 7847 // Construct the "from" expression, which is an implicit cast to the 7848 // appropriately-qualified base type. 7849 Expr *From = OtherRef; 7850 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 7851 VK_XValue, &BasePath).take(); 7852 7853 // Dereference "this". 7854 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7855 7856 // Implicitly cast "this" to the appropriately-qualified base type. 7857 To = ImpCastExprToType(To.take(), 7858 Context.getCVRQualifiedType(BaseType, 7859 MoveAssignOperator->getTypeQualifiers()), 7860 CK_UncheckedDerivedToBase, 7861 VK_LValue, &BasePath); 7862 7863 // Build the move. 7864 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 7865 To.get(), From, 7866 /*CopyingBaseSubobject=*/true, 7867 /*Copying=*/false); 7868 if (Move.isInvalid()) { 7869 Diag(CurrentLocation, diag::note_member_synthesized_at) 7870 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 7871 MoveAssignOperator->setInvalidDecl(); 7872 return; 7873 } 7874 7875 // Success! Record the move. 7876 Statements.push_back(Move.takeAs<Expr>()); 7877 } 7878 7879 // \brief Reference to the __builtin_memcpy function. 7880 Expr *BuiltinMemCpyRef = 0; 7881 // \brief Reference to the __builtin_objc_memmove_collectable function. 7882 Expr *CollectableMemCpyRef = 0; 7883 7884 // Assign non-static members. 7885 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7886 FieldEnd = ClassDecl->field_end(); 7887 Field != FieldEnd; ++Field) { 7888 // Check for members of reference type; we can't move those. 7889 if (Field->getType()->isReferenceType()) { 7890 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7891 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7892 Diag(Field->getLocation(), diag::note_declared_at); 7893 Diag(CurrentLocation, diag::note_member_synthesized_at) 7894 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 7895 Invalid = true; 7896 continue; 7897 } 7898 7899 // Check for members of const-qualified, non-class type. 7900 QualType BaseType = Context.getBaseElementType(Field->getType()); 7901 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7902 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7903 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7904 Diag(Field->getLocation(), diag::note_declared_at); 7905 Diag(CurrentLocation, diag::note_member_synthesized_at) 7906 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 7907 Invalid = true; 7908 continue; 7909 } 7910 7911 // Suppress assigning zero-width bitfields. 7912 if (const Expr *Width = Field->getBitWidth()) 7913 if (Width->EvaluateAsInt(Context) == 0) 7914 continue; 7915 7916 QualType FieldType = Field->getType().getNonReferenceType(); 7917 if (FieldType->isIncompleteArrayType()) { 7918 assert(ClassDecl->hasFlexibleArrayMember() && 7919 "Incomplete array type is not valid"); 7920 continue; 7921 } 7922 7923 // Build references to the field in the object we're copying from and to. 7924 CXXScopeSpec SS; // Intentionally empty 7925 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7926 LookupMemberName); 7927 MemberLookup.addDecl(*Field); 7928 MemberLookup.resolveKind(); 7929 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7930 Loc, /*IsArrow=*/false, 7931 SS, 0, MemberLookup, 0); 7932 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7933 Loc, /*IsArrow=*/true, 7934 SS, 0, MemberLookup, 0); 7935 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7936 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7937 7938 assert(!From.get()->isLValue() && // could be xvalue or prvalue 7939 "Member reference with rvalue base must be rvalue except for reference " 7940 "members, which aren't allowed for move assignment."); 7941 7942 // If the field should be copied with __builtin_memcpy rather than via 7943 // explicit assignments, do so. This optimization only applies for arrays 7944 // of scalars and arrays of class type with trivial move-assignment 7945 // operators. 7946 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7947 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 7948 // Compute the size of the memory buffer to be copied. 7949 QualType SizeType = Context.getSizeType(); 7950 llvm::APInt Size(Context.getTypeSize(SizeType), 7951 Context.getTypeSizeInChars(BaseType).getQuantity()); 7952 for (const ConstantArrayType *Array 7953 = Context.getAsConstantArrayType(FieldType); 7954 Array; 7955 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7956 llvm::APInt ArraySize 7957 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7958 Size *= ArraySize; 7959 } 7960 7961 // Take the address of the field references for "from" and "to". We 7962 // directly construct UnaryOperators here because semantic analysis 7963 // does not permit us to take the address of an xvalue. 7964 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 7965 Context.getPointerType(From.get()->getType()), 7966 VK_RValue, OK_Ordinary, Loc); 7967 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 7968 Context.getPointerType(To.get()->getType()), 7969 VK_RValue, OK_Ordinary, Loc); 7970 7971 bool NeedsCollectableMemCpy = 7972 (BaseType->isRecordType() && 7973 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7974 7975 if (NeedsCollectableMemCpy) { 7976 if (!CollectableMemCpyRef) { 7977 // Create a reference to the __builtin_objc_memmove_collectable function. 7978 LookupResult R(*this, 7979 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7980 Loc, LookupOrdinaryName); 7981 LookupName(R, TUScope, true); 7982 7983 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7984 if (!CollectableMemCpy) { 7985 // Something went horribly wrong earlier, and we will have 7986 // complained about it. 7987 Invalid = true; 7988 continue; 7989 } 7990 7991 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7992 CollectableMemCpy->getType(), 7993 VK_LValue, Loc, 0).take(); 7994 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7995 } 7996 } 7997 // Create a reference to the __builtin_memcpy builtin function. 7998 else if (!BuiltinMemCpyRef) { 7999 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8000 LookupOrdinaryName); 8001 LookupName(R, TUScope, true); 8002 8003 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8004 if (!BuiltinMemCpy) { 8005 // Something went horribly wrong earlier, and we will have complained 8006 // about it. 8007 Invalid = true; 8008 continue; 8009 } 8010 8011 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8012 BuiltinMemCpy->getType(), 8013 VK_LValue, Loc, 0).take(); 8014 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8015 } 8016 8017 ASTOwningVector<Expr*> CallArgs(*this); 8018 CallArgs.push_back(To.takeAs<Expr>()); 8019 CallArgs.push_back(From.takeAs<Expr>()); 8020 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8021 ExprResult Call = ExprError(); 8022 if (NeedsCollectableMemCpy) 8023 Call = ActOnCallExpr(/*Scope=*/0, 8024 CollectableMemCpyRef, 8025 Loc, move_arg(CallArgs), 8026 Loc); 8027 else 8028 Call = ActOnCallExpr(/*Scope=*/0, 8029 BuiltinMemCpyRef, 8030 Loc, move_arg(CallArgs), 8031 Loc); 8032 8033 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8034 Statements.push_back(Call.takeAs<Expr>()); 8035 continue; 8036 } 8037 8038 // Build the move of this field. 8039 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8040 To.get(), From.get(), 8041 /*CopyingBaseSubobject=*/false, 8042 /*Copying=*/false); 8043 if (Move.isInvalid()) { 8044 Diag(CurrentLocation, diag::note_member_synthesized_at) 8045 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8046 MoveAssignOperator->setInvalidDecl(); 8047 return; 8048 } 8049 8050 // Success! Record the copy. 8051 Statements.push_back(Move.takeAs<Stmt>()); 8052 } 8053 8054 if (!Invalid) { 8055 // Add a "return *this;" 8056 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8057 8058 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8059 if (Return.isInvalid()) 8060 Invalid = true; 8061 else { 8062 Statements.push_back(Return.takeAs<Stmt>()); 8063 8064 if (Trap.hasErrorOccurred()) { 8065 Diag(CurrentLocation, diag::note_member_synthesized_at) 8066 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8067 Invalid = true; 8068 } 8069 } 8070 } 8071 8072 if (Invalid) { 8073 MoveAssignOperator->setInvalidDecl(); 8074 return; 8075 } 8076 8077 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8078 /*isStmtExpr=*/false); 8079 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8080 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8081 8082 if (ASTMutationListener *L = getASTMutationListener()) { 8083 L->CompletedImplicitDefinition(MoveAssignOperator); 8084 } 8085} 8086 8087std::pair<Sema::ImplicitExceptionSpecification, bool> 8088Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8089 if (ClassDecl->isInvalidDecl()) 8090 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8091 8092 // C++ [class.copy]p5: 8093 // The implicitly-declared copy constructor for a class X will 8094 // have the form 8095 // 8096 // X::X(const X&) 8097 // 8098 // if 8099 // FIXME: It ought to be possible to store this on the record. 8100 bool HasConstCopyConstructor = true; 8101 8102 // -- each direct or virtual base class B of X has a copy 8103 // constructor whose first parameter is of type const B& or 8104 // const volatile B&, and 8105 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8106 BaseEnd = ClassDecl->bases_end(); 8107 HasConstCopyConstructor && Base != BaseEnd; 8108 ++Base) { 8109 // Virtual bases are handled below. 8110 if (Base->isVirtual()) 8111 continue; 8112 8113 CXXRecordDecl *BaseClassDecl 8114 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8115 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8116 &HasConstCopyConstructor); 8117 } 8118 8119 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8120 BaseEnd = ClassDecl->vbases_end(); 8121 HasConstCopyConstructor && Base != BaseEnd; 8122 ++Base) { 8123 CXXRecordDecl *BaseClassDecl 8124 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8125 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8126 &HasConstCopyConstructor); 8127 } 8128 8129 // -- for all the nonstatic data members of X that are of a 8130 // class type M (or array thereof), each such class type 8131 // has a copy constructor whose first parameter is of type 8132 // const M& or const volatile M&. 8133 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8134 FieldEnd = ClassDecl->field_end(); 8135 HasConstCopyConstructor && Field != FieldEnd; 8136 ++Field) { 8137 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8138 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8139 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8140 &HasConstCopyConstructor); 8141 } 8142 } 8143 // Otherwise, the implicitly declared copy constructor will have 8144 // the form 8145 // 8146 // X::X(X&) 8147 8148 // C++ [except.spec]p14: 8149 // An implicitly declared special member function (Clause 12) shall have an 8150 // exception-specification. [...] 8151 ImplicitExceptionSpecification ExceptSpec(Context); 8152 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8153 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8154 BaseEnd = ClassDecl->bases_end(); 8155 Base != BaseEnd; 8156 ++Base) { 8157 // Virtual bases are handled below. 8158 if (Base->isVirtual()) 8159 continue; 8160 8161 CXXRecordDecl *BaseClassDecl 8162 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8163 if (CXXConstructorDecl *CopyConstructor = 8164 LookupCopyingConstructor(BaseClassDecl, Quals)) 8165 ExceptSpec.CalledDecl(CopyConstructor); 8166 } 8167 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8168 BaseEnd = ClassDecl->vbases_end(); 8169 Base != BaseEnd; 8170 ++Base) { 8171 CXXRecordDecl *BaseClassDecl 8172 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8173 if (CXXConstructorDecl *CopyConstructor = 8174 LookupCopyingConstructor(BaseClassDecl, Quals)) 8175 ExceptSpec.CalledDecl(CopyConstructor); 8176 } 8177 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8178 FieldEnd = ClassDecl->field_end(); 8179 Field != FieldEnd; 8180 ++Field) { 8181 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8182 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8183 if (CXXConstructorDecl *CopyConstructor = 8184 LookupCopyingConstructor(FieldClassDecl, Quals)) 8185 ExceptSpec.CalledDecl(CopyConstructor); 8186 } 8187 } 8188 8189 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8190} 8191 8192CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8193 CXXRecordDecl *ClassDecl) { 8194 // C++ [class.copy]p4: 8195 // If the class definition does not explicitly declare a copy 8196 // constructor, one is declared implicitly. 8197 8198 ImplicitExceptionSpecification Spec(Context); 8199 bool Const; 8200 llvm::tie(Spec, Const) = 8201 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8202 8203 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8204 QualType ArgType = ClassType; 8205 if (Const) 8206 ArgType = ArgType.withConst(); 8207 ArgType = Context.getLValueReferenceType(ArgType); 8208 8209 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8210 8211 DeclarationName Name 8212 = Context.DeclarationNames.getCXXConstructorName( 8213 Context.getCanonicalType(ClassType)); 8214 SourceLocation ClassLoc = ClassDecl->getLocation(); 8215 DeclarationNameInfo NameInfo(Name, ClassLoc); 8216 8217 // An implicitly-declared copy constructor is an inline public 8218 // member of its class. 8219 CXXConstructorDecl *CopyConstructor 8220 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8221 Context.getFunctionType(Context.VoidTy, 8222 &ArgType, 1, EPI), 8223 /*TInfo=*/0, 8224 /*isExplicit=*/false, 8225 /*isInline=*/true, 8226 /*isImplicitlyDeclared=*/true, 8227 // FIXME: apply the rules for definitions here 8228 /*isConstexpr=*/false); 8229 CopyConstructor->setAccess(AS_public); 8230 CopyConstructor->setDefaulted(); 8231 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8232 8233 // Note that we have declared this constructor. 8234 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8235 8236 // Add the parameter to the constructor. 8237 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8238 ClassLoc, ClassLoc, 8239 /*IdentifierInfo=*/0, 8240 ArgType, /*TInfo=*/0, 8241 SC_None, 8242 SC_None, 0); 8243 CopyConstructor->setParams(&FromParam, 1); 8244 8245 if (Scope *S = getScopeForContext(ClassDecl)) 8246 PushOnScopeChains(CopyConstructor, S, false); 8247 ClassDecl->addDecl(CopyConstructor); 8248 8249 // C++0x [class.copy]p7: 8250 // ... If the class definition declares a move constructor or move 8251 // assignment operator, the implicitly declared constructor is defined as 8252 // deleted; ... 8253 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8254 ClassDecl->hasUserDeclaredMoveAssignment() || 8255 ShouldDeleteCopyConstructor(CopyConstructor)) 8256 CopyConstructor->setDeletedAsWritten(); 8257 8258 return CopyConstructor; 8259} 8260 8261void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8262 CXXConstructorDecl *CopyConstructor) { 8263 assert((CopyConstructor->isDefaulted() && 8264 CopyConstructor->isCopyConstructor() && 8265 !CopyConstructor->doesThisDeclarationHaveABody()) && 8266 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8267 8268 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8269 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8270 8271 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8272 DiagnosticErrorTrap Trap(Diags); 8273 8274 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8275 Trap.hasErrorOccurred()) { 8276 Diag(CurrentLocation, diag::note_member_synthesized_at) 8277 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8278 CopyConstructor->setInvalidDecl(); 8279 } else { 8280 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8281 CopyConstructor->getLocation(), 8282 MultiStmtArg(*this, 0, 0), 8283 /*isStmtExpr=*/false) 8284 .takeAs<Stmt>()); 8285 } 8286 8287 CopyConstructor->setUsed(); 8288 8289 if (ASTMutationListener *L = getASTMutationListener()) { 8290 L->CompletedImplicitDefinition(CopyConstructor); 8291 } 8292} 8293 8294Sema::ImplicitExceptionSpecification 8295Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8296 // C++ [except.spec]p14: 8297 // An implicitly declared special member function (Clause 12) shall have an 8298 // exception-specification. [...] 8299 ImplicitExceptionSpecification ExceptSpec(Context); 8300 if (ClassDecl->isInvalidDecl()) 8301 return ExceptSpec; 8302 8303 // Direct base-class constructors. 8304 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8305 BEnd = ClassDecl->bases_end(); 8306 B != BEnd; ++B) { 8307 if (B->isVirtual()) // Handled below. 8308 continue; 8309 8310 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8311 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8312 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8313 // If this is a deleted function, add it anyway. This might be conformant 8314 // with the standard. This might not. I'm not sure. It might not matter. 8315 if (Constructor) 8316 ExceptSpec.CalledDecl(Constructor); 8317 } 8318 } 8319 8320 // Virtual base-class constructors. 8321 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8322 BEnd = ClassDecl->vbases_end(); 8323 B != BEnd; ++B) { 8324 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8325 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8326 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8327 // If this is a deleted function, add it anyway. This might be conformant 8328 // with the standard. This might not. I'm not sure. It might not matter. 8329 if (Constructor) 8330 ExceptSpec.CalledDecl(Constructor); 8331 } 8332 } 8333 8334 // Field constructors. 8335 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8336 FEnd = ClassDecl->field_end(); 8337 F != FEnd; ++F) { 8338 if (F->hasInClassInitializer()) { 8339 if (Expr *E = F->getInClassInitializer()) 8340 ExceptSpec.CalledExpr(E); 8341 else if (!F->isInvalidDecl()) 8342 ExceptSpec.SetDelayed(); 8343 } else if (const RecordType *RecordTy 8344 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8345 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8346 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8347 // If this is a deleted function, add it anyway. This might be conformant 8348 // with the standard. This might not. I'm not sure. It might not matter. 8349 // In particular, the problem is that this function never gets called. It 8350 // might just be ill-formed because this function attempts to refer to 8351 // a deleted function here. 8352 if (Constructor) 8353 ExceptSpec.CalledDecl(Constructor); 8354 } 8355 } 8356 8357 return ExceptSpec; 8358} 8359 8360CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8361 CXXRecordDecl *ClassDecl) { 8362 ImplicitExceptionSpecification Spec( 8363 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8364 8365 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8366 QualType ArgType = Context.getRValueReferenceType(ClassType); 8367 8368 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8369 8370 DeclarationName Name 8371 = Context.DeclarationNames.getCXXConstructorName( 8372 Context.getCanonicalType(ClassType)); 8373 SourceLocation ClassLoc = ClassDecl->getLocation(); 8374 DeclarationNameInfo NameInfo(Name, ClassLoc); 8375 8376 // C++0x [class.copy]p11: 8377 // An implicitly-declared copy/move constructor is an inline public 8378 // member of its class. 8379 CXXConstructorDecl *MoveConstructor 8380 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8381 Context.getFunctionType(Context.VoidTy, 8382 &ArgType, 1, EPI), 8383 /*TInfo=*/0, 8384 /*isExplicit=*/false, 8385 /*isInline=*/true, 8386 /*isImplicitlyDeclared=*/true, 8387 // FIXME: apply the rules for definitions here 8388 /*isConstexpr=*/false); 8389 MoveConstructor->setAccess(AS_public); 8390 MoveConstructor->setDefaulted(); 8391 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8392 8393 // Add the parameter to the constructor. 8394 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8395 ClassLoc, ClassLoc, 8396 /*IdentifierInfo=*/0, 8397 ArgType, /*TInfo=*/0, 8398 SC_None, 8399 SC_None, 0); 8400 MoveConstructor->setParams(&FromParam, 1); 8401 8402 // C++0x [class.copy]p9: 8403 // If the definition of a class X does not explicitly declare a move 8404 // constructor, one will be implicitly declared as defaulted if and only if: 8405 // [...] 8406 // - the move constructor would not be implicitly defined as deleted. 8407 if (ShouldDeleteMoveConstructor(MoveConstructor)) { 8408 // Cache this result so that we don't try to generate this over and over 8409 // on every lookup, leaking memory and wasting time. 8410 ClassDecl->setFailedImplicitMoveConstructor(); 8411 return 0; 8412 } 8413 8414 // Note that we have declared this constructor. 8415 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8416 8417 if (Scope *S = getScopeForContext(ClassDecl)) 8418 PushOnScopeChains(MoveConstructor, S, false); 8419 ClassDecl->addDecl(MoveConstructor); 8420 8421 return MoveConstructor; 8422} 8423 8424void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8425 CXXConstructorDecl *MoveConstructor) { 8426 assert((MoveConstructor->isDefaulted() && 8427 MoveConstructor->isMoveConstructor() && 8428 !MoveConstructor->doesThisDeclarationHaveABody()) && 8429 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8430 8431 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8432 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8433 8434 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8435 DiagnosticErrorTrap Trap(Diags); 8436 8437 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8438 Trap.hasErrorOccurred()) { 8439 Diag(CurrentLocation, diag::note_member_synthesized_at) 8440 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8441 MoveConstructor->setInvalidDecl(); 8442 } else { 8443 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8444 MoveConstructor->getLocation(), 8445 MultiStmtArg(*this, 0, 0), 8446 /*isStmtExpr=*/false) 8447 .takeAs<Stmt>()); 8448 } 8449 8450 MoveConstructor->setUsed(); 8451 8452 if (ASTMutationListener *L = getASTMutationListener()) { 8453 L->CompletedImplicitDefinition(MoveConstructor); 8454 } 8455} 8456 8457ExprResult 8458Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8459 CXXConstructorDecl *Constructor, 8460 MultiExprArg ExprArgs, 8461 bool RequiresZeroInit, 8462 unsigned ConstructKind, 8463 SourceRange ParenRange) { 8464 bool Elidable = false; 8465 8466 // C++0x [class.copy]p34: 8467 // When certain criteria are met, an implementation is allowed to 8468 // omit the copy/move construction of a class object, even if the 8469 // copy/move constructor and/or destructor for the object have 8470 // side effects. [...] 8471 // - when a temporary class object that has not been bound to a 8472 // reference (12.2) would be copied/moved to a class object 8473 // with the same cv-unqualified type, the copy/move operation 8474 // can be omitted by constructing the temporary object 8475 // directly into the target of the omitted copy/move 8476 if (ConstructKind == CXXConstructExpr::CK_Complete && 8477 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8478 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8479 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8480 } 8481 8482 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8483 Elidable, move(ExprArgs), RequiresZeroInit, 8484 ConstructKind, ParenRange); 8485} 8486 8487/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8488/// including handling of its default argument expressions. 8489ExprResult 8490Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8491 CXXConstructorDecl *Constructor, bool Elidable, 8492 MultiExprArg ExprArgs, 8493 bool RequiresZeroInit, 8494 unsigned ConstructKind, 8495 SourceRange ParenRange) { 8496 unsigned NumExprs = ExprArgs.size(); 8497 Expr **Exprs = (Expr **)ExprArgs.release(); 8498 8499 for (specific_attr_iterator<NonNullAttr> 8500 i = Constructor->specific_attr_begin<NonNullAttr>(), 8501 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8502 const NonNullAttr *NonNull = *i; 8503 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8504 } 8505 8506 MarkDeclarationReferenced(ConstructLoc, Constructor); 8507 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8508 Constructor, Elidable, Exprs, NumExprs, 8509 RequiresZeroInit, 8510 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8511 ParenRange)); 8512} 8513 8514bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8515 CXXConstructorDecl *Constructor, 8516 MultiExprArg Exprs) { 8517 // FIXME: Provide the correct paren SourceRange when available. 8518 ExprResult TempResult = 8519 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8520 move(Exprs), false, CXXConstructExpr::CK_Complete, 8521 SourceRange()); 8522 if (TempResult.isInvalid()) 8523 return true; 8524 8525 Expr *Temp = TempResult.takeAs<Expr>(); 8526 CheckImplicitConversions(Temp, VD->getLocation()); 8527 MarkDeclarationReferenced(VD->getLocation(), Constructor); 8528 Temp = MaybeCreateExprWithCleanups(Temp); 8529 VD->setInit(Temp); 8530 8531 return false; 8532} 8533 8534void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8535 if (VD->isInvalidDecl()) return; 8536 8537 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8538 if (ClassDecl->isInvalidDecl()) return; 8539 if (ClassDecl->hasTrivialDestructor()) return; 8540 if (ClassDecl->isDependentContext()) return; 8541 8542 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 8543 MarkDeclarationReferenced(VD->getLocation(), Destructor); 8544 CheckDestructorAccess(VD->getLocation(), Destructor, 8545 PDiag(diag::err_access_dtor_var) 8546 << VD->getDeclName() 8547 << VD->getType()); 8548 8549 if (!VD->hasGlobalStorage()) return; 8550 8551 // Emit warning for non-trivial dtor in global scope (a real global, 8552 // class-static, function-static). 8553 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 8554 8555 // TODO: this should be re-enabled for static locals by !CXAAtExit 8556 if (!VD->isStaticLocal()) 8557 Diag(VD->getLocation(), diag::warn_global_destructor); 8558} 8559 8560/// AddCXXDirectInitializerToDecl - This action is called immediately after 8561/// ActOnDeclarator, when a C++ direct initializer is present. 8562/// e.g: "int x(1);" 8563void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 8564 SourceLocation LParenLoc, 8565 MultiExprArg Exprs, 8566 SourceLocation RParenLoc, 8567 bool TypeMayContainAuto) { 8568 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 8569 8570 // If there is no declaration, there was an error parsing it. Just ignore 8571 // the initializer. 8572 if (RealDecl == 0) 8573 return; 8574 8575 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 8576 if (!VDecl) { 8577 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 8578 RealDecl->setInvalidDecl(); 8579 return; 8580 } 8581 8582 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 8583 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 8584 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 8585 if (Exprs.size() > 1) { 8586 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 8587 diag::err_auto_var_init_multiple_expressions) 8588 << VDecl->getDeclName() << VDecl->getType() 8589 << VDecl->getSourceRange(); 8590 RealDecl->setInvalidDecl(); 8591 return; 8592 } 8593 8594 Expr *Init = Exprs.get()[0]; 8595 TypeSourceInfo *DeducedType = 0; 8596 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 8597 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 8598 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 8599 << Init->getSourceRange(); 8600 if (!DeducedType) { 8601 RealDecl->setInvalidDecl(); 8602 return; 8603 } 8604 VDecl->setTypeSourceInfo(DeducedType); 8605 VDecl->setType(DeducedType->getType()); 8606 8607 // In ARC, infer lifetime. 8608 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 8609 VDecl->setInvalidDecl(); 8610 8611 // If this is a redeclaration, check that the type we just deduced matches 8612 // the previously declared type. 8613 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 8614 MergeVarDeclTypes(VDecl, Old); 8615 } 8616 8617 // We will represent direct-initialization similarly to copy-initialization: 8618 // int x(1); -as-> int x = 1; 8619 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 8620 // 8621 // Clients that want to distinguish between the two forms, can check for 8622 // direct initializer using VarDecl::hasCXXDirectInitializer(). 8623 // A major benefit is that clients that don't particularly care about which 8624 // exactly form was it (like the CodeGen) can handle both cases without 8625 // special case code. 8626 8627 // C++ 8.5p11: 8628 // The form of initialization (using parentheses or '=') is generally 8629 // insignificant, but does matter when the entity being initialized has a 8630 // class type. 8631 8632 if (!VDecl->getType()->isDependentType() && 8633 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 8634 diag::err_typecheck_decl_incomplete_type)) { 8635 VDecl->setInvalidDecl(); 8636 return; 8637 } 8638 8639 // The variable can not have an abstract class type. 8640 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 8641 diag::err_abstract_type_in_decl, 8642 AbstractVariableType)) 8643 VDecl->setInvalidDecl(); 8644 8645 const VarDecl *Def; 8646 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 8647 Diag(VDecl->getLocation(), diag::err_redefinition) 8648 << VDecl->getDeclName(); 8649 Diag(Def->getLocation(), diag::note_previous_definition); 8650 VDecl->setInvalidDecl(); 8651 return; 8652 } 8653 8654 // C++ [class.static.data]p4 8655 // If a static data member is of const integral or const 8656 // enumeration type, its declaration in the class definition can 8657 // specify a constant-initializer which shall be an integral 8658 // constant expression (5.19). In that case, the member can appear 8659 // in integral constant expressions. The member shall still be 8660 // defined in a namespace scope if it is used in the program and the 8661 // namespace scope definition shall not contain an initializer. 8662 // 8663 // We already performed a redefinition check above, but for static 8664 // data members we also need to check whether there was an in-class 8665 // declaration with an initializer. 8666 const VarDecl* PrevInit = 0; 8667 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 8668 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 8669 Diag(PrevInit->getLocation(), diag::note_previous_definition); 8670 return; 8671 } 8672 8673 bool IsDependent = false; 8674 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 8675 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 8676 VDecl->setInvalidDecl(); 8677 return; 8678 } 8679 8680 if (Exprs.get()[I]->isTypeDependent()) 8681 IsDependent = true; 8682 } 8683 8684 // If either the declaration has a dependent type or if any of the 8685 // expressions is type-dependent, we represent the initialization 8686 // via a ParenListExpr for later use during template instantiation. 8687 if (VDecl->getType()->isDependentType() || IsDependent) { 8688 // Let clients know that initialization was done with a direct initializer. 8689 VDecl->setCXXDirectInitializer(true); 8690 8691 // Store the initialization expressions as a ParenListExpr. 8692 unsigned NumExprs = Exprs.size(); 8693 VDecl->setInit(new (Context) ParenListExpr( 8694 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 8695 VDecl->getType().getNonReferenceType())); 8696 return; 8697 } 8698 8699 // Capture the variable that is being initialized and the style of 8700 // initialization. 8701 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 8702 8703 // FIXME: Poor source location information. 8704 InitializationKind Kind 8705 = InitializationKind::CreateDirect(VDecl->getLocation(), 8706 LParenLoc, RParenLoc); 8707 8708 InitializationSequence InitSeq(*this, Entity, Kind, 8709 Exprs.get(), Exprs.size()); 8710 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 8711 if (Result.isInvalid()) { 8712 VDecl->setInvalidDecl(); 8713 return; 8714 } 8715 8716 CheckImplicitConversions(Result.get(), LParenLoc); 8717 8718 Result = MaybeCreateExprWithCleanups(Result); 8719 VDecl->setInit(Result.takeAs<Expr>()); 8720 VDecl->setCXXDirectInitializer(true); 8721 8722 CheckCompleteVariableDeclaration(VDecl); 8723} 8724 8725/// \brief Given a constructor and the set of arguments provided for the 8726/// constructor, convert the arguments and add any required default arguments 8727/// to form a proper call to this constructor. 8728/// 8729/// \returns true if an error occurred, false otherwise. 8730bool 8731Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 8732 MultiExprArg ArgsPtr, 8733 SourceLocation Loc, 8734 ASTOwningVector<Expr*> &ConvertedArgs) { 8735 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 8736 unsigned NumArgs = ArgsPtr.size(); 8737 Expr **Args = (Expr **)ArgsPtr.get(); 8738 8739 const FunctionProtoType *Proto 8740 = Constructor->getType()->getAs<FunctionProtoType>(); 8741 assert(Proto && "Constructor without a prototype?"); 8742 unsigned NumArgsInProto = Proto->getNumArgs(); 8743 8744 // If too few arguments are available, we'll fill in the rest with defaults. 8745 if (NumArgs < NumArgsInProto) 8746 ConvertedArgs.reserve(NumArgsInProto); 8747 else 8748 ConvertedArgs.reserve(NumArgs); 8749 8750 VariadicCallType CallType = 8751 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 8752 SmallVector<Expr *, 8> AllArgs; 8753 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 8754 Proto, 0, Args, NumArgs, AllArgs, 8755 CallType); 8756 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 8757 ConvertedArgs.push_back(AllArgs[i]); 8758 return Invalid; 8759} 8760 8761static inline bool 8762CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 8763 const FunctionDecl *FnDecl) { 8764 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 8765 if (isa<NamespaceDecl>(DC)) { 8766 return SemaRef.Diag(FnDecl->getLocation(), 8767 diag::err_operator_new_delete_declared_in_namespace) 8768 << FnDecl->getDeclName(); 8769 } 8770 8771 if (isa<TranslationUnitDecl>(DC) && 8772 FnDecl->getStorageClass() == SC_Static) { 8773 return SemaRef.Diag(FnDecl->getLocation(), 8774 diag::err_operator_new_delete_declared_static) 8775 << FnDecl->getDeclName(); 8776 } 8777 8778 return false; 8779} 8780 8781static inline bool 8782CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 8783 CanQualType ExpectedResultType, 8784 CanQualType ExpectedFirstParamType, 8785 unsigned DependentParamTypeDiag, 8786 unsigned InvalidParamTypeDiag) { 8787 QualType ResultType = 8788 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 8789 8790 // Check that the result type is not dependent. 8791 if (ResultType->isDependentType()) 8792 return SemaRef.Diag(FnDecl->getLocation(), 8793 diag::err_operator_new_delete_dependent_result_type) 8794 << FnDecl->getDeclName() << ExpectedResultType; 8795 8796 // Check that the result type is what we expect. 8797 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 8798 return SemaRef.Diag(FnDecl->getLocation(), 8799 diag::err_operator_new_delete_invalid_result_type) 8800 << FnDecl->getDeclName() << ExpectedResultType; 8801 8802 // A function template must have at least 2 parameters. 8803 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 8804 return SemaRef.Diag(FnDecl->getLocation(), 8805 diag::err_operator_new_delete_template_too_few_parameters) 8806 << FnDecl->getDeclName(); 8807 8808 // The function decl must have at least 1 parameter. 8809 if (FnDecl->getNumParams() == 0) 8810 return SemaRef.Diag(FnDecl->getLocation(), 8811 diag::err_operator_new_delete_too_few_parameters) 8812 << FnDecl->getDeclName(); 8813 8814 // Check the the first parameter type is not dependent. 8815 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 8816 if (FirstParamType->isDependentType()) 8817 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 8818 << FnDecl->getDeclName() << ExpectedFirstParamType; 8819 8820 // Check that the first parameter type is what we expect. 8821 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 8822 ExpectedFirstParamType) 8823 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 8824 << FnDecl->getDeclName() << ExpectedFirstParamType; 8825 8826 return false; 8827} 8828 8829static bool 8830CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 8831 // C++ [basic.stc.dynamic.allocation]p1: 8832 // A program is ill-formed if an allocation function is declared in a 8833 // namespace scope other than global scope or declared static in global 8834 // scope. 8835 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 8836 return true; 8837 8838 CanQualType SizeTy = 8839 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 8840 8841 // C++ [basic.stc.dynamic.allocation]p1: 8842 // The return type shall be void*. The first parameter shall have type 8843 // std::size_t. 8844 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 8845 SizeTy, 8846 diag::err_operator_new_dependent_param_type, 8847 diag::err_operator_new_param_type)) 8848 return true; 8849 8850 // C++ [basic.stc.dynamic.allocation]p1: 8851 // The first parameter shall not have an associated default argument. 8852 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 8853 return SemaRef.Diag(FnDecl->getLocation(), 8854 diag::err_operator_new_default_arg) 8855 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 8856 8857 return false; 8858} 8859 8860static bool 8861CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 8862 // C++ [basic.stc.dynamic.deallocation]p1: 8863 // A program is ill-formed if deallocation functions are declared in a 8864 // namespace scope other than global scope or declared static in global 8865 // scope. 8866 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 8867 return true; 8868 8869 // C++ [basic.stc.dynamic.deallocation]p2: 8870 // Each deallocation function shall return void and its first parameter 8871 // shall be void*. 8872 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 8873 SemaRef.Context.VoidPtrTy, 8874 diag::err_operator_delete_dependent_param_type, 8875 diag::err_operator_delete_param_type)) 8876 return true; 8877 8878 return false; 8879} 8880 8881/// CheckOverloadedOperatorDeclaration - Check whether the declaration 8882/// of this overloaded operator is well-formed. If so, returns false; 8883/// otherwise, emits appropriate diagnostics and returns true. 8884bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 8885 assert(FnDecl && FnDecl->isOverloadedOperator() && 8886 "Expected an overloaded operator declaration"); 8887 8888 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 8889 8890 // C++ [over.oper]p5: 8891 // The allocation and deallocation functions, operator new, 8892 // operator new[], operator delete and operator delete[], are 8893 // described completely in 3.7.3. The attributes and restrictions 8894 // found in the rest of this subclause do not apply to them unless 8895 // explicitly stated in 3.7.3. 8896 if (Op == OO_Delete || Op == OO_Array_Delete) 8897 return CheckOperatorDeleteDeclaration(*this, FnDecl); 8898 8899 if (Op == OO_New || Op == OO_Array_New) 8900 return CheckOperatorNewDeclaration(*this, FnDecl); 8901 8902 // C++ [over.oper]p6: 8903 // An operator function shall either be a non-static member 8904 // function or be a non-member function and have at least one 8905 // parameter whose type is a class, a reference to a class, an 8906 // enumeration, or a reference to an enumeration. 8907 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 8908 if (MethodDecl->isStatic()) 8909 return Diag(FnDecl->getLocation(), 8910 diag::err_operator_overload_static) << FnDecl->getDeclName(); 8911 } else { 8912 bool ClassOrEnumParam = false; 8913 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 8914 ParamEnd = FnDecl->param_end(); 8915 Param != ParamEnd; ++Param) { 8916 QualType ParamType = (*Param)->getType().getNonReferenceType(); 8917 if (ParamType->isDependentType() || ParamType->isRecordType() || 8918 ParamType->isEnumeralType()) { 8919 ClassOrEnumParam = true; 8920 break; 8921 } 8922 } 8923 8924 if (!ClassOrEnumParam) 8925 return Diag(FnDecl->getLocation(), 8926 diag::err_operator_overload_needs_class_or_enum) 8927 << FnDecl->getDeclName(); 8928 } 8929 8930 // C++ [over.oper]p8: 8931 // An operator function cannot have default arguments (8.3.6), 8932 // except where explicitly stated below. 8933 // 8934 // Only the function-call operator allows default arguments 8935 // (C++ [over.call]p1). 8936 if (Op != OO_Call) { 8937 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 8938 Param != FnDecl->param_end(); ++Param) { 8939 if ((*Param)->hasDefaultArg()) 8940 return Diag((*Param)->getLocation(), 8941 diag::err_operator_overload_default_arg) 8942 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 8943 } 8944 } 8945 8946 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 8947 { false, false, false } 8948#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 8949 , { Unary, Binary, MemberOnly } 8950#include "clang/Basic/OperatorKinds.def" 8951 }; 8952 8953 bool CanBeUnaryOperator = OperatorUses[Op][0]; 8954 bool CanBeBinaryOperator = OperatorUses[Op][1]; 8955 bool MustBeMemberOperator = OperatorUses[Op][2]; 8956 8957 // C++ [over.oper]p8: 8958 // [...] Operator functions cannot have more or fewer parameters 8959 // than the number required for the corresponding operator, as 8960 // described in the rest of this subclause. 8961 unsigned NumParams = FnDecl->getNumParams() 8962 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 8963 if (Op != OO_Call && 8964 ((NumParams == 1 && !CanBeUnaryOperator) || 8965 (NumParams == 2 && !CanBeBinaryOperator) || 8966 (NumParams < 1) || (NumParams > 2))) { 8967 // We have the wrong number of parameters. 8968 unsigned ErrorKind; 8969 if (CanBeUnaryOperator && CanBeBinaryOperator) { 8970 ErrorKind = 2; // 2 -> unary or binary. 8971 } else if (CanBeUnaryOperator) { 8972 ErrorKind = 0; // 0 -> unary 8973 } else { 8974 assert(CanBeBinaryOperator && 8975 "All non-call overloaded operators are unary or binary!"); 8976 ErrorKind = 1; // 1 -> binary 8977 } 8978 8979 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 8980 << FnDecl->getDeclName() << NumParams << ErrorKind; 8981 } 8982 8983 // Overloaded operators other than operator() cannot be variadic. 8984 if (Op != OO_Call && 8985 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 8986 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 8987 << FnDecl->getDeclName(); 8988 } 8989 8990 // Some operators must be non-static member functions. 8991 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 8992 return Diag(FnDecl->getLocation(), 8993 diag::err_operator_overload_must_be_member) 8994 << FnDecl->getDeclName(); 8995 } 8996 8997 // C++ [over.inc]p1: 8998 // The user-defined function called operator++ implements the 8999 // prefix and postfix ++ operator. If this function is a member 9000 // function with no parameters, or a non-member function with one 9001 // parameter of class or enumeration type, it defines the prefix 9002 // increment operator ++ for objects of that type. If the function 9003 // is a member function with one parameter (which shall be of type 9004 // int) or a non-member function with two parameters (the second 9005 // of which shall be of type int), it defines the postfix 9006 // increment operator ++ for objects of that type. 9007 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9008 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9009 bool ParamIsInt = false; 9010 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9011 ParamIsInt = BT->getKind() == BuiltinType::Int; 9012 9013 if (!ParamIsInt) 9014 return Diag(LastParam->getLocation(), 9015 diag::err_operator_overload_post_incdec_must_be_int) 9016 << LastParam->getType() << (Op == OO_MinusMinus); 9017 } 9018 9019 return false; 9020} 9021 9022/// CheckLiteralOperatorDeclaration - Check whether the declaration 9023/// of this literal operator function is well-formed. If so, returns 9024/// false; otherwise, emits appropriate diagnostics and returns true. 9025bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9026 DeclContext *DC = FnDecl->getDeclContext(); 9027 Decl::Kind Kind = DC->getDeclKind(); 9028 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9029 Kind != Decl::LinkageSpec) { 9030 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9031 << FnDecl->getDeclName(); 9032 return true; 9033 } 9034 9035 bool Valid = false; 9036 9037 // template <char...> type operator "" name() is the only valid template 9038 // signature, and the only valid signature with no parameters. 9039 if (FnDecl->param_size() == 0) { 9040 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9041 // Must have only one template parameter 9042 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9043 if (Params->size() == 1) { 9044 NonTypeTemplateParmDecl *PmDecl = 9045 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9046 9047 // The template parameter must be a char parameter pack. 9048 if (PmDecl && PmDecl->isTemplateParameterPack() && 9049 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9050 Valid = true; 9051 } 9052 } 9053 } else { 9054 // Check the first parameter 9055 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9056 9057 QualType T = (*Param)->getType(); 9058 9059 // unsigned long long int, long double, and any character type are allowed 9060 // as the only parameters. 9061 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9062 Context.hasSameType(T, Context.LongDoubleTy) || 9063 Context.hasSameType(T, Context.CharTy) || 9064 Context.hasSameType(T, Context.WCharTy) || 9065 Context.hasSameType(T, Context.Char16Ty) || 9066 Context.hasSameType(T, Context.Char32Ty)) { 9067 if (++Param == FnDecl->param_end()) 9068 Valid = true; 9069 goto FinishedParams; 9070 } 9071 9072 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9073 const PointerType *PT = T->getAs<PointerType>(); 9074 if (!PT) 9075 goto FinishedParams; 9076 T = PT->getPointeeType(); 9077 if (!T.isConstQualified()) 9078 goto FinishedParams; 9079 T = T.getUnqualifiedType(); 9080 9081 // Move on to the second parameter; 9082 ++Param; 9083 9084 // If there is no second parameter, the first must be a const char * 9085 if (Param == FnDecl->param_end()) { 9086 if (Context.hasSameType(T, Context.CharTy)) 9087 Valid = true; 9088 goto FinishedParams; 9089 } 9090 9091 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9092 // are allowed as the first parameter to a two-parameter function 9093 if (!(Context.hasSameType(T, Context.CharTy) || 9094 Context.hasSameType(T, Context.WCharTy) || 9095 Context.hasSameType(T, Context.Char16Ty) || 9096 Context.hasSameType(T, Context.Char32Ty))) 9097 goto FinishedParams; 9098 9099 // The second and final parameter must be an std::size_t 9100 T = (*Param)->getType().getUnqualifiedType(); 9101 if (Context.hasSameType(T, Context.getSizeType()) && 9102 ++Param == FnDecl->param_end()) 9103 Valid = true; 9104 } 9105 9106 // FIXME: This diagnostic is absolutely terrible. 9107FinishedParams: 9108 if (!Valid) { 9109 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9110 << FnDecl->getDeclName(); 9111 return true; 9112 } 9113 9114 StringRef LiteralName 9115 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9116 if (LiteralName[0] != '_') { 9117 // C++0x [usrlit.suffix]p1: 9118 // Literal suffix identifiers that do not start with an underscore are 9119 // reserved for future standardization. 9120 bool IsHexFloat = true; 9121 if (LiteralName.size() > 1 && 9122 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9123 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9124 if (!isdigit(LiteralName[I])) { 9125 IsHexFloat = false; 9126 break; 9127 } 9128 } 9129 } 9130 9131 if (IsHexFloat) 9132 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9133 << LiteralName; 9134 else 9135 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9136 } 9137 9138 return false; 9139} 9140 9141/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9142/// linkage specification, including the language and (if present) 9143/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9144/// the location of the language string literal, which is provided 9145/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9146/// the '{' brace. Otherwise, this linkage specification does not 9147/// have any braces. 9148Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9149 SourceLocation LangLoc, 9150 StringRef Lang, 9151 SourceLocation LBraceLoc) { 9152 LinkageSpecDecl::LanguageIDs Language; 9153 if (Lang == "\"C\"") 9154 Language = LinkageSpecDecl::lang_c; 9155 else if (Lang == "\"C++\"") 9156 Language = LinkageSpecDecl::lang_cxx; 9157 else { 9158 Diag(LangLoc, diag::err_bad_language); 9159 return 0; 9160 } 9161 9162 // FIXME: Add all the various semantics of linkage specifications 9163 9164 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9165 ExternLoc, LangLoc, Language); 9166 CurContext->addDecl(D); 9167 PushDeclContext(S, D); 9168 return D; 9169} 9170 9171/// ActOnFinishLinkageSpecification - Complete the definition of 9172/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9173/// valid, it's the position of the closing '}' brace in a linkage 9174/// specification that uses braces. 9175Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9176 Decl *LinkageSpec, 9177 SourceLocation RBraceLoc) { 9178 if (LinkageSpec) { 9179 if (RBraceLoc.isValid()) { 9180 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9181 LSDecl->setRBraceLoc(RBraceLoc); 9182 } 9183 PopDeclContext(); 9184 } 9185 return LinkageSpec; 9186} 9187 9188/// \brief Perform semantic analysis for the variable declaration that 9189/// occurs within a C++ catch clause, returning the newly-created 9190/// variable. 9191VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9192 TypeSourceInfo *TInfo, 9193 SourceLocation StartLoc, 9194 SourceLocation Loc, 9195 IdentifierInfo *Name) { 9196 bool Invalid = false; 9197 QualType ExDeclType = TInfo->getType(); 9198 9199 // Arrays and functions decay. 9200 if (ExDeclType->isArrayType()) 9201 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9202 else if (ExDeclType->isFunctionType()) 9203 ExDeclType = Context.getPointerType(ExDeclType); 9204 9205 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9206 // The exception-declaration shall not denote a pointer or reference to an 9207 // incomplete type, other than [cv] void*. 9208 // N2844 forbids rvalue references. 9209 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9210 Diag(Loc, diag::err_catch_rvalue_ref); 9211 Invalid = true; 9212 } 9213 9214 // GCC allows catching pointers and references to incomplete types 9215 // as an extension; so do we, but we warn by default. 9216 9217 QualType BaseType = ExDeclType; 9218 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9219 unsigned DK = diag::err_catch_incomplete; 9220 bool IncompleteCatchIsInvalid = true; 9221 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9222 BaseType = Ptr->getPointeeType(); 9223 Mode = 1; 9224 DK = diag::ext_catch_incomplete_ptr; 9225 IncompleteCatchIsInvalid = false; 9226 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9227 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9228 BaseType = Ref->getPointeeType(); 9229 Mode = 2; 9230 DK = diag::ext_catch_incomplete_ref; 9231 IncompleteCatchIsInvalid = false; 9232 } 9233 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9234 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9235 IncompleteCatchIsInvalid) 9236 Invalid = true; 9237 9238 if (!Invalid && !ExDeclType->isDependentType() && 9239 RequireNonAbstractType(Loc, ExDeclType, 9240 diag::err_abstract_type_in_decl, 9241 AbstractVariableType)) 9242 Invalid = true; 9243 9244 // Only the non-fragile NeXT runtime currently supports C++ catches 9245 // of ObjC types, and no runtime supports catching ObjC types by value. 9246 if (!Invalid && getLangOptions().ObjC1) { 9247 QualType T = ExDeclType; 9248 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9249 T = RT->getPointeeType(); 9250 9251 if (T->isObjCObjectType()) { 9252 Diag(Loc, diag::err_objc_object_catch); 9253 Invalid = true; 9254 } else if (T->isObjCObjectPointerType()) { 9255 if (!getLangOptions().ObjCNonFragileABI) 9256 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9257 } 9258 } 9259 9260 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9261 ExDeclType, TInfo, SC_None, SC_None); 9262 ExDecl->setExceptionVariable(true); 9263 9264 if (!Invalid && !ExDeclType->isDependentType()) { 9265 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9266 // C++ [except.handle]p16: 9267 // The object declared in an exception-declaration or, if the 9268 // exception-declaration does not specify a name, a temporary (12.2) is 9269 // copy-initialized (8.5) from the exception object. [...] 9270 // The object is destroyed when the handler exits, after the destruction 9271 // of any automatic objects initialized within the handler. 9272 // 9273 // We just pretend to initialize the object with itself, then make sure 9274 // it can be destroyed later. 9275 QualType initType = ExDeclType; 9276 9277 InitializedEntity entity = 9278 InitializedEntity::InitializeVariable(ExDecl); 9279 InitializationKind initKind = 9280 InitializationKind::CreateCopy(Loc, SourceLocation()); 9281 9282 Expr *opaqueValue = 9283 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9284 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9285 ExprResult result = sequence.Perform(*this, entity, initKind, 9286 MultiExprArg(&opaqueValue, 1)); 9287 if (result.isInvalid()) 9288 Invalid = true; 9289 else { 9290 // If the constructor used was non-trivial, set this as the 9291 // "initializer". 9292 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9293 if (!construct->getConstructor()->isTrivial()) { 9294 Expr *init = MaybeCreateExprWithCleanups(construct); 9295 ExDecl->setInit(init); 9296 } 9297 9298 // And make sure it's destructable. 9299 FinalizeVarWithDestructor(ExDecl, recordType); 9300 } 9301 } 9302 } 9303 9304 if (Invalid) 9305 ExDecl->setInvalidDecl(); 9306 9307 return ExDecl; 9308} 9309 9310/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9311/// handler. 9312Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9313 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9314 bool Invalid = D.isInvalidType(); 9315 9316 // Check for unexpanded parameter packs. 9317 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9318 UPPC_ExceptionType)) { 9319 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9320 D.getIdentifierLoc()); 9321 Invalid = true; 9322 } 9323 9324 IdentifierInfo *II = D.getIdentifier(); 9325 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9326 LookupOrdinaryName, 9327 ForRedeclaration)) { 9328 // The scope should be freshly made just for us. There is just no way 9329 // it contains any previous declaration. 9330 assert(!S->isDeclScope(PrevDecl)); 9331 if (PrevDecl->isTemplateParameter()) { 9332 // Maybe we will complain about the shadowed template parameter. 9333 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9334 } 9335 } 9336 9337 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9338 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9339 << D.getCXXScopeSpec().getRange(); 9340 Invalid = true; 9341 } 9342 9343 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9344 D.getSourceRange().getBegin(), 9345 D.getIdentifierLoc(), 9346 D.getIdentifier()); 9347 if (Invalid) 9348 ExDecl->setInvalidDecl(); 9349 9350 // Add the exception declaration into this scope. 9351 if (II) 9352 PushOnScopeChains(ExDecl, S); 9353 else 9354 CurContext->addDecl(ExDecl); 9355 9356 ProcessDeclAttributes(S, ExDecl, D); 9357 return ExDecl; 9358} 9359 9360Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9361 Expr *AssertExpr, 9362 Expr *AssertMessageExpr_, 9363 SourceLocation RParenLoc) { 9364 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9365 9366 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9367 llvm::APSInt Value(32); 9368 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 9369 Diag(StaticAssertLoc, 9370 diag::err_static_assert_expression_is_not_constant) << 9371 AssertExpr->getSourceRange(); 9372 return 0; 9373 } 9374 9375 if (Value == 0) { 9376 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9377 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9378 } 9379 } 9380 9381 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9382 return 0; 9383 9384 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9385 AssertExpr, AssertMessage, RParenLoc); 9386 9387 CurContext->addDecl(Decl); 9388 return Decl; 9389} 9390 9391/// \brief Perform semantic analysis of the given friend type declaration. 9392/// 9393/// \returns A friend declaration that. 9394FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 9395 TypeSourceInfo *TSInfo) { 9396 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9397 9398 QualType T = TSInfo->getType(); 9399 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9400 9401 if (!getLangOptions().CPlusPlus0x) { 9402 // C++03 [class.friend]p2: 9403 // An elaborated-type-specifier shall be used in a friend declaration 9404 // for a class.* 9405 // 9406 // * The class-key of the elaborated-type-specifier is required. 9407 if (!ActiveTemplateInstantiations.empty()) { 9408 // Do not complain about the form of friend template types during 9409 // template instantiation; we will already have complained when the 9410 // template was declared. 9411 } else if (!T->isElaboratedTypeSpecifier()) { 9412 // If we evaluated the type to a record type, suggest putting 9413 // a tag in front. 9414 if (const RecordType *RT = T->getAs<RecordType>()) { 9415 RecordDecl *RD = RT->getDecl(); 9416 9417 std::string InsertionText = std::string(" ") + RD->getKindName(); 9418 9419 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 9420 << (unsigned) RD->getTagKind() 9421 << T 9422 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9423 InsertionText); 9424 } else { 9425 Diag(FriendLoc, diag::ext_nonclass_type_friend) 9426 << T 9427 << SourceRange(FriendLoc, TypeRange.getEnd()); 9428 } 9429 } else if (T->getAs<EnumType>()) { 9430 Diag(FriendLoc, diag::ext_enum_friend) 9431 << T 9432 << SourceRange(FriendLoc, TypeRange.getEnd()); 9433 } 9434 } 9435 9436 // C++0x [class.friend]p3: 9437 // If the type specifier in a friend declaration designates a (possibly 9438 // cv-qualified) class type, that class is declared as a friend; otherwise, 9439 // the friend declaration is ignored. 9440 9441 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9442 // in [class.friend]p3 that we do not implement. 9443 9444 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 9445} 9446 9447/// Handle a friend tag declaration where the scope specifier was 9448/// templated. 9449Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9450 unsigned TagSpec, SourceLocation TagLoc, 9451 CXXScopeSpec &SS, 9452 IdentifierInfo *Name, SourceLocation NameLoc, 9453 AttributeList *Attr, 9454 MultiTemplateParamsArg TempParamLists) { 9455 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9456 9457 bool isExplicitSpecialization = false; 9458 bool Invalid = false; 9459 9460 if (TemplateParameterList *TemplateParams 9461 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9462 TempParamLists.get(), 9463 TempParamLists.size(), 9464 /*friend*/ true, 9465 isExplicitSpecialization, 9466 Invalid)) { 9467 if (TemplateParams->size() > 0) { 9468 // This is a declaration of a class template. 9469 if (Invalid) 9470 return 0; 9471 9472 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9473 SS, Name, NameLoc, Attr, 9474 TemplateParams, AS_public, 9475 /*ModulePrivateLoc=*/SourceLocation(), 9476 TempParamLists.size() - 1, 9477 (TemplateParameterList**) TempParamLists.release()).take(); 9478 } else { 9479 // The "template<>" header is extraneous. 9480 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9481 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9482 isExplicitSpecialization = true; 9483 } 9484 } 9485 9486 if (Invalid) return 0; 9487 9488 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9489 9490 bool isAllExplicitSpecializations = true; 9491 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9492 if (TempParamLists.get()[I]->size()) { 9493 isAllExplicitSpecializations = false; 9494 break; 9495 } 9496 } 9497 9498 // FIXME: don't ignore attributes. 9499 9500 // If it's explicit specializations all the way down, just forget 9501 // about the template header and build an appropriate non-templated 9502 // friend. TODO: for source fidelity, remember the headers. 9503 if (isAllExplicitSpecializations) { 9504 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9505 ElaboratedTypeKeyword Keyword 9506 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9507 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9508 *Name, NameLoc); 9509 if (T.isNull()) 9510 return 0; 9511 9512 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9513 if (isa<DependentNameType>(T)) { 9514 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9515 TL.setKeywordLoc(TagLoc); 9516 TL.setQualifierLoc(QualifierLoc); 9517 TL.setNameLoc(NameLoc); 9518 } else { 9519 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9520 TL.setKeywordLoc(TagLoc); 9521 TL.setQualifierLoc(QualifierLoc); 9522 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9523 } 9524 9525 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9526 TSI, FriendLoc); 9527 Friend->setAccess(AS_public); 9528 CurContext->addDecl(Friend); 9529 return Friend; 9530 } 9531 9532 // Handle the case of a templated-scope friend class. e.g. 9533 // template <class T> class A<T>::B; 9534 // FIXME: we don't support these right now. 9535 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9536 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9537 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9538 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9539 TL.setKeywordLoc(TagLoc); 9540 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9541 TL.setNameLoc(NameLoc); 9542 9543 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9544 TSI, FriendLoc); 9545 Friend->setAccess(AS_public); 9546 Friend->setUnsupportedFriend(true); 9547 CurContext->addDecl(Friend); 9548 return Friend; 9549} 9550 9551 9552/// Handle a friend type declaration. This works in tandem with 9553/// ActOnTag. 9554/// 9555/// Notes on friend class templates: 9556/// 9557/// We generally treat friend class declarations as if they were 9558/// declaring a class. So, for example, the elaborated type specifier 9559/// in a friend declaration is required to obey the restrictions of a 9560/// class-head (i.e. no typedefs in the scope chain), template 9561/// parameters are required to match up with simple template-ids, &c. 9562/// However, unlike when declaring a template specialization, it's 9563/// okay to refer to a template specialization without an empty 9564/// template parameter declaration, e.g. 9565/// friend class A<T>::B<unsigned>; 9566/// We permit this as a special case; if there are any template 9567/// parameters present at all, require proper matching, i.e. 9568/// template <> template <class T> friend class A<int>::B; 9569Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9570 MultiTemplateParamsArg TempParams) { 9571 SourceLocation Loc = DS.getSourceRange().getBegin(); 9572 9573 assert(DS.isFriendSpecified()); 9574 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9575 9576 // Try to convert the decl specifier to a type. This works for 9577 // friend templates because ActOnTag never produces a ClassTemplateDecl 9578 // for a TUK_Friend. 9579 Declarator TheDeclarator(DS, Declarator::MemberContext); 9580 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9581 QualType T = TSI->getType(); 9582 if (TheDeclarator.isInvalidType()) 9583 return 0; 9584 9585 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9586 return 0; 9587 9588 // This is definitely an error in C++98. It's probably meant to 9589 // be forbidden in C++0x, too, but the specification is just 9590 // poorly written. 9591 // 9592 // The problem is with declarations like the following: 9593 // template <T> friend A<T>::foo; 9594 // where deciding whether a class C is a friend or not now hinges 9595 // on whether there exists an instantiation of A that causes 9596 // 'foo' to equal C. There are restrictions on class-heads 9597 // (which we declare (by fiat) elaborated friend declarations to 9598 // be) that makes this tractable. 9599 // 9600 // FIXME: handle "template <> friend class A<T>;", which 9601 // is possibly well-formed? Who even knows? 9602 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9603 Diag(Loc, diag::err_tagless_friend_type_template) 9604 << DS.getSourceRange(); 9605 return 0; 9606 } 9607 9608 // C++98 [class.friend]p1: A friend of a class is a function 9609 // or class that is not a member of the class . . . 9610 // This is fixed in DR77, which just barely didn't make the C++03 9611 // deadline. It's also a very silly restriction that seriously 9612 // affects inner classes and which nobody else seems to implement; 9613 // thus we never diagnose it, not even in -pedantic. 9614 // 9615 // But note that we could warn about it: it's always useless to 9616 // friend one of your own members (it's not, however, worthless to 9617 // friend a member of an arbitrary specialization of your template). 9618 9619 Decl *D; 9620 if (unsigned NumTempParamLists = TempParams.size()) 9621 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9622 NumTempParamLists, 9623 TempParams.release(), 9624 TSI, 9625 DS.getFriendSpecLoc()); 9626 else 9627 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 9628 9629 if (!D) 9630 return 0; 9631 9632 D->setAccess(AS_public); 9633 CurContext->addDecl(D); 9634 9635 return D; 9636} 9637 9638Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 9639 MultiTemplateParamsArg TemplateParams) { 9640 const DeclSpec &DS = D.getDeclSpec(); 9641 9642 assert(DS.isFriendSpecified()); 9643 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9644 9645 SourceLocation Loc = D.getIdentifierLoc(); 9646 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9647 QualType T = TInfo->getType(); 9648 9649 // C++ [class.friend]p1 9650 // A friend of a class is a function or class.... 9651 // Note that this sees through typedefs, which is intended. 9652 // It *doesn't* see through dependent types, which is correct 9653 // according to [temp.arg.type]p3: 9654 // If a declaration acquires a function type through a 9655 // type dependent on a template-parameter and this causes 9656 // a declaration that does not use the syntactic form of a 9657 // function declarator to have a function type, the program 9658 // is ill-formed. 9659 if (!T->isFunctionType()) { 9660 Diag(Loc, diag::err_unexpected_friend); 9661 9662 // It might be worthwhile to try to recover by creating an 9663 // appropriate declaration. 9664 return 0; 9665 } 9666 9667 // C++ [namespace.memdef]p3 9668 // - If a friend declaration in a non-local class first declares a 9669 // class or function, the friend class or function is a member 9670 // of the innermost enclosing namespace. 9671 // - The name of the friend is not found by simple name lookup 9672 // until a matching declaration is provided in that namespace 9673 // scope (either before or after the class declaration granting 9674 // friendship). 9675 // - If a friend function is called, its name may be found by the 9676 // name lookup that considers functions from namespaces and 9677 // classes associated with the types of the function arguments. 9678 // - When looking for a prior declaration of a class or a function 9679 // declared as a friend, scopes outside the innermost enclosing 9680 // namespace scope are not considered. 9681 9682 CXXScopeSpec &SS = D.getCXXScopeSpec(); 9683 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 9684 DeclarationName Name = NameInfo.getName(); 9685 assert(Name); 9686 9687 // Check for unexpanded parameter packs. 9688 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 9689 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 9690 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 9691 return 0; 9692 9693 // The context we found the declaration in, or in which we should 9694 // create the declaration. 9695 DeclContext *DC; 9696 Scope *DCScope = S; 9697 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 9698 ForRedeclaration); 9699 9700 // FIXME: there are different rules in local classes 9701 9702 // There are four cases here. 9703 // - There's no scope specifier, in which case we just go to the 9704 // appropriate scope and look for a function or function template 9705 // there as appropriate. 9706 // Recover from invalid scope qualifiers as if they just weren't there. 9707 if (SS.isInvalid() || !SS.isSet()) { 9708 // C++0x [namespace.memdef]p3: 9709 // If the name in a friend declaration is neither qualified nor 9710 // a template-id and the declaration is a function or an 9711 // elaborated-type-specifier, the lookup to determine whether 9712 // the entity has been previously declared shall not consider 9713 // any scopes outside the innermost enclosing namespace. 9714 // C++0x [class.friend]p11: 9715 // If a friend declaration appears in a local class and the name 9716 // specified is an unqualified name, a prior declaration is 9717 // looked up without considering scopes that are outside the 9718 // innermost enclosing non-class scope. For a friend function 9719 // declaration, if there is no prior declaration, the program is 9720 // ill-formed. 9721 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 9722 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 9723 9724 // Find the appropriate context according to the above. 9725 DC = CurContext; 9726 while (true) { 9727 // Skip class contexts. If someone can cite chapter and verse 9728 // for this behavior, that would be nice --- it's what GCC and 9729 // EDG do, and it seems like a reasonable intent, but the spec 9730 // really only says that checks for unqualified existing 9731 // declarations should stop at the nearest enclosing namespace, 9732 // not that they should only consider the nearest enclosing 9733 // namespace. 9734 while (DC->isRecord()) 9735 DC = DC->getParent(); 9736 9737 LookupQualifiedName(Previous, DC); 9738 9739 // TODO: decide what we think about using declarations. 9740 if (isLocal || !Previous.empty()) 9741 break; 9742 9743 if (isTemplateId) { 9744 if (isa<TranslationUnitDecl>(DC)) break; 9745 } else { 9746 if (DC->isFileContext()) break; 9747 } 9748 DC = DC->getParent(); 9749 } 9750 9751 // C++ [class.friend]p1: A friend of a class is a function or 9752 // class that is not a member of the class . . . 9753 // C++0x changes this for both friend types and functions. 9754 // Most C++ 98 compilers do seem to give an error here, so 9755 // we do, too. 9756 if (!Previous.empty() && DC->Equals(CurContext) 9757 && !getLangOptions().CPlusPlus0x) 9758 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 9759 9760 DCScope = getScopeForDeclContext(S, DC); 9761 9762 // - There's a non-dependent scope specifier, in which case we 9763 // compute it and do a previous lookup there for a function 9764 // or function template. 9765 } else if (!SS.getScopeRep()->isDependent()) { 9766 DC = computeDeclContext(SS); 9767 if (!DC) return 0; 9768 9769 if (RequireCompleteDeclContext(SS, DC)) return 0; 9770 9771 LookupQualifiedName(Previous, DC); 9772 9773 // Ignore things found implicitly in the wrong scope. 9774 // TODO: better diagnostics for this case. Suggesting the right 9775 // qualified scope would be nice... 9776 LookupResult::Filter F = Previous.makeFilter(); 9777 while (F.hasNext()) { 9778 NamedDecl *D = F.next(); 9779 if (!DC->InEnclosingNamespaceSetOf( 9780 D->getDeclContext()->getRedeclContext())) 9781 F.erase(); 9782 } 9783 F.done(); 9784 9785 if (Previous.empty()) { 9786 D.setInvalidType(); 9787 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 9788 return 0; 9789 } 9790 9791 // C++ [class.friend]p1: A friend of a class is a function or 9792 // class that is not a member of the class . . . 9793 if (DC->Equals(CurContext)) 9794 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 9795 9796 // - There's a scope specifier that does not match any template 9797 // parameter lists, in which case we use some arbitrary context, 9798 // create a method or method template, and wait for instantiation. 9799 // - There's a scope specifier that does match some template 9800 // parameter lists, which we don't handle right now. 9801 } else { 9802 DC = CurContext; 9803 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 9804 } 9805 9806 if (!DC->isRecord()) { 9807 // This implies that it has to be an operator or function. 9808 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 9809 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 9810 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 9811 Diag(Loc, diag::err_introducing_special_friend) << 9812 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 9813 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 9814 return 0; 9815 } 9816 } 9817 9818 bool Redeclaration = false; 9819 bool AddToScope = true; 9820 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 9821 move(TemplateParams), 9822 IsDefinition, 9823 Redeclaration, AddToScope); 9824 if (!ND) return 0; 9825 9826 assert(ND->getDeclContext() == DC); 9827 assert(ND->getLexicalDeclContext() == CurContext); 9828 9829 // Add the function declaration to the appropriate lookup tables, 9830 // adjusting the redeclarations list as necessary. We don't 9831 // want to do this yet if the friending class is dependent. 9832 // 9833 // Also update the scope-based lookup if the target context's 9834 // lookup context is in lexical scope. 9835 if (!CurContext->isDependentContext()) { 9836 DC = DC->getRedeclContext(); 9837 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 9838 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 9839 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 9840 } 9841 9842 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 9843 D.getIdentifierLoc(), ND, 9844 DS.getFriendSpecLoc()); 9845 FrD->setAccess(AS_public); 9846 CurContext->addDecl(FrD); 9847 9848 if (ND->isInvalidDecl()) 9849 FrD->setInvalidDecl(); 9850 else { 9851 FunctionDecl *FD; 9852 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 9853 FD = FTD->getTemplatedDecl(); 9854 else 9855 FD = cast<FunctionDecl>(ND); 9856 9857 // Mark templated-scope function declarations as unsupported. 9858 if (FD->getNumTemplateParameterLists()) 9859 FrD->setUnsupportedFriend(true); 9860 } 9861 9862 return ND; 9863} 9864 9865void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 9866 AdjustDeclIfTemplate(Dcl); 9867 9868 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 9869 if (!Fn) { 9870 Diag(DelLoc, diag::err_deleted_non_function); 9871 return; 9872 } 9873 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 9874 Diag(DelLoc, diag::err_deleted_decl_not_first); 9875 Diag(Prev->getLocation(), diag::note_previous_declaration); 9876 // If the declaration wasn't the first, we delete the function anyway for 9877 // recovery. 9878 } 9879 Fn->setDeletedAsWritten(); 9880} 9881 9882void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 9883 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 9884 9885 if (MD) { 9886 if (MD->getParent()->isDependentType()) { 9887 MD->setDefaulted(); 9888 MD->setExplicitlyDefaulted(); 9889 return; 9890 } 9891 9892 CXXSpecialMember Member = getSpecialMember(MD); 9893 if (Member == CXXInvalid) { 9894 Diag(DefaultLoc, diag::err_default_special_members); 9895 return; 9896 } 9897 9898 MD->setDefaulted(); 9899 MD->setExplicitlyDefaulted(); 9900 9901 // If this definition appears within the record, do the checking when 9902 // the record is complete. 9903 const FunctionDecl *Primary = MD; 9904 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 9905 // Find the uninstantiated declaration that actually had the '= default' 9906 // on it. 9907 MD->getTemplateInstantiationPattern()->isDefined(Primary); 9908 9909 if (Primary == Primary->getCanonicalDecl()) 9910 return; 9911 9912 switch (Member) { 9913 case CXXDefaultConstructor: { 9914 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 9915 CheckExplicitlyDefaultedDefaultConstructor(CD); 9916 if (!CD->isInvalidDecl()) 9917 DefineImplicitDefaultConstructor(DefaultLoc, CD); 9918 break; 9919 } 9920 9921 case CXXCopyConstructor: { 9922 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 9923 CheckExplicitlyDefaultedCopyConstructor(CD); 9924 if (!CD->isInvalidDecl()) 9925 DefineImplicitCopyConstructor(DefaultLoc, CD); 9926 break; 9927 } 9928 9929 case CXXCopyAssignment: { 9930 CheckExplicitlyDefaultedCopyAssignment(MD); 9931 if (!MD->isInvalidDecl()) 9932 DefineImplicitCopyAssignment(DefaultLoc, MD); 9933 break; 9934 } 9935 9936 case CXXDestructor: { 9937 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 9938 CheckExplicitlyDefaultedDestructor(DD); 9939 if (!DD->isInvalidDecl()) 9940 DefineImplicitDestructor(DefaultLoc, DD); 9941 break; 9942 } 9943 9944 case CXXMoveConstructor: { 9945 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 9946 CheckExplicitlyDefaultedMoveConstructor(CD); 9947 if (!CD->isInvalidDecl()) 9948 DefineImplicitMoveConstructor(DefaultLoc, CD); 9949 break; 9950 } 9951 9952 case CXXMoveAssignment: { 9953 CheckExplicitlyDefaultedMoveAssignment(MD); 9954 if (!MD->isInvalidDecl()) 9955 DefineImplicitMoveAssignment(DefaultLoc, MD); 9956 break; 9957 } 9958 9959 case CXXInvalid: 9960 assert(false && "Invalid special member."); 9961 break; 9962 } 9963 } else { 9964 Diag(DefaultLoc, diag::err_default_special_members); 9965 } 9966} 9967 9968static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 9969 for (Stmt::child_range CI = S->children(); CI; ++CI) { 9970 Stmt *SubStmt = *CI; 9971 if (!SubStmt) 9972 continue; 9973 if (isa<ReturnStmt>(SubStmt)) 9974 Self.Diag(SubStmt->getSourceRange().getBegin(), 9975 diag::err_return_in_constructor_handler); 9976 if (!isa<Expr>(SubStmt)) 9977 SearchForReturnInStmt(Self, SubStmt); 9978 } 9979} 9980 9981void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 9982 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 9983 CXXCatchStmt *Handler = TryBlock->getHandler(I); 9984 SearchForReturnInStmt(*this, Handler); 9985 } 9986} 9987 9988bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 9989 const CXXMethodDecl *Old) { 9990 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 9991 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 9992 9993 if (Context.hasSameType(NewTy, OldTy) || 9994 NewTy->isDependentType() || OldTy->isDependentType()) 9995 return false; 9996 9997 // Check if the return types are covariant 9998 QualType NewClassTy, OldClassTy; 9999 10000 /// Both types must be pointers or references to classes. 10001 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10002 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10003 NewClassTy = NewPT->getPointeeType(); 10004 OldClassTy = OldPT->getPointeeType(); 10005 } 10006 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10007 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10008 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10009 NewClassTy = NewRT->getPointeeType(); 10010 OldClassTy = OldRT->getPointeeType(); 10011 } 10012 } 10013 } 10014 10015 // The return types aren't either both pointers or references to a class type. 10016 if (NewClassTy.isNull()) { 10017 Diag(New->getLocation(), 10018 diag::err_different_return_type_for_overriding_virtual_function) 10019 << New->getDeclName() << NewTy << OldTy; 10020 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10021 10022 return true; 10023 } 10024 10025 // C++ [class.virtual]p6: 10026 // If the return type of D::f differs from the return type of B::f, the 10027 // class type in the return type of D::f shall be complete at the point of 10028 // declaration of D::f or shall be the class type D. 10029 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10030 if (!RT->isBeingDefined() && 10031 RequireCompleteType(New->getLocation(), NewClassTy, 10032 PDiag(diag::err_covariant_return_incomplete) 10033 << New->getDeclName())) 10034 return true; 10035 } 10036 10037 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10038 // Check if the new class derives from the old class. 10039 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10040 Diag(New->getLocation(), 10041 diag::err_covariant_return_not_derived) 10042 << New->getDeclName() << NewTy << OldTy; 10043 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10044 return true; 10045 } 10046 10047 // Check if we the conversion from derived to base is valid. 10048 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10049 diag::err_covariant_return_inaccessible_base, 10050 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10051 // FIXME: Should this point to the return type? 10052 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10053 // FIXME: this note won't trigger for delayed access control 10054 // diagnostics, and it's impossible to get an undelayed error 10055 // here from access control during the original parse because 10056 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10057 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10058 return true; 10059 } 10060 } 10061 10062 // The qualifiers of the return types must be the same. 10063 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10064 Diag(New->getLocation(), 10065 diag::err_covariant_return_type_different_qualifications) 10066 << New->getDeclName() << NewTy << OldTy; 10067 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10068 return true; 10069 }; 10070 10071 10072 // The new class type must have the same or less qualifiers as the old type. 10073 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10074 Diag(New->getLocation(), 10075 diag::err_covariant_return_type_class_type_more_qualified) 10076 << New->getDeclName() << NewTy << OldTy; 10077 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10078 return true; 10079 }; 10080 10081 return false; 10082} 10083 10084/// \brief Mark the given method pure. 10085/// 10086/// \param Method the method to be marked pure. 10087/// 10088/// \param InitRange the source range that covers the "0" initializer. 10089bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10090 SourceLocation EndLoc = InitRange.getEnd(); 10091 if (EndLoc.isValid()) 10092 Method->setRangeEnd(EndLoc); 10093 10094 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10095 Method->setPure(); 10096 return false; 10097 } 10098 10099 if (!Method->isInvalidDecl()) 10100 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10101 << Method->getDeclName() << InitRange; 10102 return true; 10103} 10104 10105/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10106/// an initializer for the out-of-line declaration 'Dcl'. The scope 10107/// is a fresh scope pushed for just this purpose. 10108/// 10109/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10110/// static data member of class X, names should be looked up in the scope of 10111/// class X. 10112void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10113 // If there is no declaration, there was an error parsing it. 10114 if (D == 0 || D->isInvalidDecl()) return; 10115 10116 // We should only get called for declarations with scope specifiers, like: 10117 // int foo::bar; 10118 assert(D->isOutOfLine()); 10119 EnterDeclaratorContext(S, D->getDeclContext()); 10120} 10121 10122/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10123/// initializer for the out-of-line declaration 'D'. 10124void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10125 // If there is no declaration, there was an error parsing it. 10126 if (D == 0 || D->isInvalidDecl()) return; 10127 10128 assert(D->isOutOfLine()); 10129 ExitDeclaratorContext(S); 10130} 10131 10132/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10133/// C++ if/switch/while/for statement. 10134/// e.g: "if (int x = f()) {...}" 10135DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10136 // C++ 6.4p2: 10137 // The declarator shall not specify a function or an array. 10138 // The type-specifier-seq shall not contain typedef and shall not declare a 10139 // new class or enumeration. 10140 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10141 "Parser allowed 'typedef' as storage class of condition decl."); 10142 10143 Decl *Dcl = ActOnDeclarator(S, D); 10144 if (!Dcl) 10145 return true; 10146 10147 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10148 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10149 << D.getSourceRange(); 10150 return true; 10151 } 10152 10153 return Dcl; 10154} 10155 10156void Sema::LoadExternalVTableUses() { 10157 if (!ExternalSource) 10158 return; 10159 10160 SmallVector<ExternalVTableUse, 4> VTables; 10161 ExternalSource->ReadUsedVTables(VTables); 10162 SmallVector<VTableUse, 4> NewUses; 10163 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10164 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10165 = VTablesUsed.find(VTables[I].Record); 10166 // Even if a definition wasn't required before, it may be required now. 10167 if (Pos != VTablesUsed.end()) { 10168 if (!Pos->second && VTables[I].DefinitionRequired) 10169 Pos->second = true; 10170 continue; 10171 } 10172 10173 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10174 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10175 } 10176 10177 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10178} 10179 10180void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10181 bool DefinitionRequired) { 10182 // Ignore any vtable uses in unevaluated operands or for classes that do 10183 // not have a vtable. 10184 if (!Class->isDynamicClass() || Class->isDependentContext() || 10185 CurContext->isDependentContext() || 10186 ExprEvalContexts.back().Context == Unevaluated) 10187 return; 10188 10189 // Try to insert this class into the map. 10190 LoadExternalVTableUses(); 10191 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10192 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10193 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10194 if (!Pos.second) { 10195 // If we already had an entry, check to see if we are promoting this vtable 10196 // to required a definition. If so, we need to reappend to the VTableUses 10197 // list, since we may have already processed the first entry. 10198 if (DefinitionRequired && !Pos.first->second) { 10199 Pos.first->second = true; 10200 } else { 10201 // Otherwise, we can early exit. 10202 return; 10203 } 10204 } 10205 10206 // Local classes need to have their virtual members marked 10207 // immediately. For all other classes, we mark their virtual members 10208 // at the end of the translation unit. 10209 if (Class->isLocalClass()) 10210 MarkVirtualMembersReferenced(Loc, Class); 10211 else 10212 VTableUses.push_back(std::make_pair(Class, Loc)); 10213} 10214 10215bool Sema::DefineUsedVTables() { 10216 LoadExternalVTableUses(); 10217 if (VTableUses.empty()) 10218 return false; 10219 10220 // Note: The VTableUses vector could grow as a result of marking 10221 // the members of a class as "used", so we check the size each 10222 // time through the loop and prefer indices (with are stable) to 10223 // iterators (which are not). 10224 bool DefinedAnything = false; 10225 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10226 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10227 if (!Class) 10228 continue; 10229 10230 SourceLocation Loc = VTableUses[I].second; 10231 10232 // If this class has a key function, but that key function is 10233 // defined in another translation unit, we don't need to emit the 10234 // vtable even though we're using it. 10235 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10236 if (KeyFunction && !KeyFunction->hasBody()) { 10237 switch (KeyFunction->getTemplateSpecializationKind()) { 10238 case TSK_Undeclared: 10239 case TSK_ExplicitSpecialization: 10240 case TSK_ExplicitInstantiationDeclaration: 10241 // The key function is in another translation unit. 10242 continue; 10243 10244 case TSK_ExplicitInstantiationDefinition: 10245 case TSK_ImplicitInstantiation: 10246 // We will be instantiating the key function. 10247 break; 10248 } 10249 } else if (!KeyFunction) { 10250 // If we have a class with no key function that is the subject 10251 // of an explicit instantiation declaration, suppress the 10252 // vtable; it will live with the explicit instantiation 10253 // definition. 10254 bool IsExplicitInstantiationDeclaration 10255 = Class->getTemplateSpecializationKind() 10256 == TSK_ExplicitInstantiationDeclaration; 10257 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10258 REnd = Class->redecls_end(); 10259 R != REnd; ++R) { 10260 TemplateSpecializationKind TSK 10261 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10262 if (TSK == TSK_ExplicitInstantiationDeclaration) 10263 IsExplicitInstantiationDeclaration = true; 10264 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10265 IsExplicitInstantiationDeclaration = false; 10266 break; 10267 } 10268 } 10269 10270 if (IsExplicitInstantiationDeclaration) 10271 continue; 10272 } 10273 10274 // Mark all of the virtual members of this class as referenced, so 10275 // that we can build a vtable. Then, tell the AST consumer that a 10276 // vtable for this class is required. 10277 DefinedAnything = true; 10278 MarkVirtualMembersReferenced(Loc, Class); 10279 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10280 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10281 10282 // Optionally warn if we're emitting a weak vtable. 10283 if (Class->getLinkage() == ExternalLinkage && 10284 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10285 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 10286 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 10287 } 10288 } 10289 VTableUses.clear(); 10290 10291 return DefinedAnything; 10292} 10293 10294void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10295 const CXXRecordDecl *RD) { 10296 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10297 e = RD->method_end(); i != e; ++i) { 10298 CXXMethodDecl *MD = *i; 10299 10300 // C++ [basic.def.odr]p2: 10301 // [...] A virtual member function is used if it is not pure. [...] 10302 if (MD->isVirtual() && !MD->isPure()) 10303 MarkDeclarationReferenced(Loc, MD); 10304 } 10305 10306 // Only classes that have virtual bases need a VTT. 10307 if (RD->getNumVBases() == 0) 10308 return; 10309 10310 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10311 e = RD->bases_end(); i != e; ++i) { 10312 const CXXRecordDecl *Base = 10313 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10314 if (Base->getNumVBases() == 0) 10315 continue; 10316 MarkVirtualMembersReferenced(Loc, Base); 10317 } 10318} 10319 10320/// SetIvarInitializers - This routine builds initialization ASTs for the 10321/// Objective-C implementation whose ivars need be initialized. 10322void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10323 if (!getLangOptions().CPlusPlus) 10324 return; 10325 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10326 SmallVector<ObjCIvarDecl*, 8> ivars; 10327 CollectIvarsToConstructOrDestruct(OID, ivars); 10328 if (ivars.empty()) 10329 return; 10330 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10331 for (unsigned i = 0; i < ivars.size(); i++) { 10332 FieldDecl *Field = ivars[i]; 10333 if (Field->isInvalidDecl()) 10334 continue; 10335 10336 CXXCtorInitializer *Member; 10337 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10338 InitializationKind InitKind = 10339 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10340 10341 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10342 ExprResult MemberInit = 10343 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10344 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10345 // Note, MemberInit could actually come back empty if no initialization 10346 // is required (e.g., because it would call a trivial default constructor) 10347 if (!MemberInit.get() || MemberInit.isInvalid()) 10348 continue; 10349 10350 Member = 10351 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10352 SourceLocation(), 10353 MemberInit.takeAs<Expr>(), 10354 SourceLocation()); 10355 AllToInit.push_back(Member); 10356 10357 // Be sure that the destructor is accessible and is marked as referenced. 10358 if (const RecordType *RecordTy 10359 = Context.getBaseElementType(Field->getType()) 10360 ->getAs<RecordType>()) { 10361 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10362 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10363 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10364 CheckDestructorAccess(Field->getLocation(), Destructor, 10365 PDiag(diag::err_access_dtor_ivar) 10366 << Context.getBaseElementType(Field->getType())); 10367 } 10368 } 10369 } 10370 ObjCImplementation->setIvarInitializers(Context, 10371 AllToInit.data(), AllToInit.size()); 10372 } 10373} 10374 10375static 10376void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10377 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10378 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10379 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10380 Sema &S) { 10381 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10382 CE = Current.end(); 10383 if (Ctor->isInvalidDecl()) 10384 return; 10385 10386 const FunctionDecl *FNTarget = 0; 10387 CXXConstructorDecl *Target; 10388 10389 // We ignore the result here since if we don't have a body, Target will be 10390 // null below. 10391 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10392 Target 10393= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10394 10395 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10396 // Avoid dereferencing a null pointer here. 10397 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10398 10399 if (!Current.insert(Canonical)) 10400 return; 10401 10402 // We know that beyond here, we aren't chaining into a cycle. 10403 if (!Target || !Target->isDelegatingConstructor() || 10404 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10405 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10406 Valid.insert(*CI); 10407 Current.clear(); 10408 // We've hit a cycle. 10409 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10410 Current.count(TCanonical)) { 10411 // If we haven't diagnosed this cycle yet, do so now. 10412 if (!Invalid.count(TCanonical)) { 10413 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10414 diag::warn_delegating_ctor_cycle) 10415 << Ctor; 10416 10417 // Don't add a note for a function delegating directo to itself. 10418 if (TCanonical != Canonical) 10419 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10420 10421 CXXConstructorDecl *C = Target; 10422 while (C->getCanonicalDecl() != Canonical) { 10423 (void)C->getTargetConstructor()->hasBody(FNTarget); 10424 assert(FNTarget && "Ctor cycle through bodiless function"); 10425 10426 C 10427 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10428 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10429 } 10430 } 10431 10432 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10433 Invalid.insert(*CI); 10434 Current.clear(); 10435 } else { 10436 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10437 } 10438} 10439 10440 10441void Sema::CheckDelegatingCtorCycles() { 10442 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10443 10444 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10445 CE = Current.end(); 10446 10447 for (DelegatingCtorDeclsType::iterator 10448 I = DelegatingCtorDecls.begin(ExternalSource), 10449 E = DelegatingCtorDecls.end(); 10450 I != E; ++I) { 10451 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10452 } 10453 10454 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10455 (*CI)->setInvalidDecl(); 10456} 10457