SemaDeclCXX.cpp revision 85ea7aa961deac1d754f610af8062ae3f8b4e2a5
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, BaseTy **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 ExprTy *BW, const VirtSpecifiers &VS, 1064 ExprTy *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 ExprTy **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 an initializer expression for use of uninitialized fields, such as 1502/// containing the field that is being initialized. Returns true if there is an 1503/// uninitialized field was used an updates the SourceLocation parameter; false 1504/// otherwise. 1505static bool InitExprContainsUninitializedFields(const Stmt *S, 1506 const ValueDecl *LhsField, 1507 SourceLocation *L) { 1508 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1509 1510 if (isa<CallExpr>(S)) { 1511 // Do not descend into function calls or constructors, as the use 1512 // of an uninitialized field may be valid. One would have to inspect 1513 // the contents of the function/ctor to determine if it is safe or not. 1514 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1515 // may be safe, depending on what the function/ctor does. 1516 return false; 1517 } 1518 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1519 const NamedDecl *RhsField = ME->getMemberDecl(); 1520 1521 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1522 // The member expression points to a static data member. 1523 assert(VD->isStaticDataMember() && 1524 "Member points to non-static data member!"); 1525 (void)VD; 1526 return false; 1527 } 1528 1529 if (isa<EnumConstantDecl>(RhsField)) { 1530 // The member expression points to an enum. 1531 return false; 1532 } 1533 1534 if (RhsField == LhsField) { 1535 // Initializing a field with itself. Throw a warning. 1536 // But wait; there are exceptions! 1537 // Exception #1: The field may not belong to this record. 1538 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1539 const Expr *base = ME->getBase(); 1540 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1541 // Even though the field matches, it does not belong to this record. 1542 return false; 1543 } 1544 // None of the exceptions triggered; return true to indicate an 1545 // uninitialized field was used. 1546 *L = ME->getMemberLoc(); 1547 return true; 1548 } 1549 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1550 // sizeof/alignof doesn't reference contents, do not warn. 1551 return false; 1552 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1553 // address-of doesn't reference contents (the pointer may be dereferenced 1554 // in the same expression but it would be rare; and weird). 1555 if (UOE->getOpcode() == UO_AddrOf) 1556 return false; 1557 } 1558 for (Stmt::const_child_range it = S->children(); it; ++it) { 1559 if (!*it) { 1560 // An expression such as 'member(arg ?: "")' may trigger this. 1561 continue; 1562 } 1563 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1564 return true; 1565 } 1566 return false; 1567} 1568 1569MemInitResult 1570Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1571 unsigned NumArgs, SourceLocation IdLoc, 1572 SourceLocation LParenLoc, 1573 SourceLocation RParenLoc) { 1574 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1575 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1576 assert((DirectMember || IndirectMember) && 1577 "Member must be a FieldDecl or IndirectFieldDecl"); 1578 1579 if (Member->isInvalidDecl()) 1580 return true; 1581 1582 // Diagnose value-uses of fields to initialize themselves, e.g. 1583 // foo(foo) 1584 // where foo is not also a parameter to the constructor. 1585 // TODO: implement -Wuninitialized and fold this into that framework. 1586 for (unsigned i = 0; i < NumArgs; ++i) { 1587 SourceLocation L; 1588 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1589 // FIXME: Return true in the case when other fields are used before being 1590 // uninitialized. For example, let this field be the i'th field. When 1591 // initializing the i'th field, throw a warning if any of the >= i'th 1592 // fields are used, as they are not yet initialized. 1593 // Right now we are only handling the case where the i'th field uses 1594 // itself in its initializer. 1595 Diag(L, diag::warn_field_is_uninit); 1596 } 1597 } 1598 1599 bool HasDependentArg = false; 1600 for (unsigned i = 0; i < NumArgs; i++) 1601 HasDependentArg |= Args[i]->isTypeDependent(); 1602 1603 Expr *Init; 1604 if (Member->getType()->isDependentType() || HasDependentArg) { 1605 // Can't check initialization for a member of dependent type or when 1606 // any of the arguments are type-dependent expressions. 1607 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1608 RParenLoc, 1609 Member->getType().getNonReferenceType()); 1610 1611 DiscardCleanupsInEvaluationContext(); 1612 } else { 1613 // Initialize the member. 1614 InitializedEntity MemberEntity = 1615 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1616 : InitializedEntity::InitializeMember(IndirectMember, 0); 1617 InitializationKind Kind = 1618 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1619 1620 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1621 1622 ExprResult MemberInit = 1623 InitSeq.Perform(*this, MemberEntity, Kind, 1624 MultiExprArg(*this, Args, NumArgs), 0); 1625 if (MemberInit.isInvalid()) 1626 return true; 1627 1628 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1629 1630 // C++0x [class.base.init]p7: 1631 // The initialization of each base and member constitutes a 1632 // full-expression. 1633 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1634 if (MemberInit.isInvalid()) 1635 return true; 1636 1637 // If we are in a dependent context, template instantiation will 1638 // perform this type-checking again. Just save the arguments that we 1639 // received in a ParenListExpr. 1640 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1641 // of the information that we have about the member 1642 // initializer. However, deconstructing the ASTs is a dicey process, 1643 // and this approach is far more likely to get the corner cases right. 1644 if (CurContext->isDependentContext()) 1645 Init = new (Context) ParenListExpr( 1646 Context, LParenLoc, Args, NumArgs, RParenLoc, 1647 Member->getType().getNonReferenceType()); 1648 else 1649 Init = MemberInit.get(); 1650 } 1651 1652 if (DirectMember) { 1653 return new (Context) CXXCtorInitializer(Context, DirectMember, 1654 IdLoc, LParenLoc, Init, 1655 RParenLoc); 1656 } else { 1657 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1658 IdLoc, LParenLoc, Init, 1659 RParenLoc); 1660 } 1661} 1662 1663MemInitResult 1664Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1665 Expr **Args, unsigned NumArgs, 1666 SourceLocation NameLoc, 1667 SourceLocation LParenLoc, 1668 SourceLocation RParenLoc, 1669 CXXRecordDecl *ClassDecl) { 1670 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1671 if (!LangOpts.CPlusPlus0x) 1672 return Diag(Loc, diag::err_delegation_0x_only) 1673 << TInfo->getTypeLoc().getLocalSourceRange(); 1674 1675 // Initialize the object. 1676 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1677 QualType(ClassDecl->getTypeForDecl(), 0)); 1678 InitializationKind Kind = 1679 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1680 1681 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1682 1683 ExprResult DelegationInit = 1684 InitSeq.Perform(*this, DelegationEntity, Kind, 1685 MultiExprArg(*this, Args, NumArgs), 0); 1686 if (DelegationInit.isInvalid()) 1687 return true; 1688 1689 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1690 CXXConstructorDecl *Constructor 1691 = ConExpr->getConstructor(); 1692 assert(Constructor && "Delegating constructor with no target?"); 1693 1694 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1695 1696 // C++0x [class.base.init]p7: 1697 // The initialization of each base and member constitutes a 1698 // full-expression. 1699 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1700 if (DelegationInit.isInvalid()) 1701 return true; 1702 1703 assert(!CurContext->isDependentContext()); 1704 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1705 DelegationInit.takeAs<Expr>(), 1706 RParenLoc); 1707} 1708 1709MemInitResult 1710Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1711 Expr **Args, unsigned NumArgs, 1712 SourceLocation LParenLoc, SourceLocation RParenLoc, 1713 CXXRecordDecl *ClassDecl, 1714 SourceLocation EllipsisLoc) { 1715 bool HasDependentArg = false; 1716 for (unsigned i = 0; i < NumArgs; i++) 1717 HasDependentArg |= Args[i]->isTypeDependent(); 1718 1719 SourceLocation BaseLoc 1720 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1721 1722 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1723 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1724 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1725 1726 // C++ [class.base.init]p2: 1727 // [...] Unless the mem-initializer-id names a nonstatic data 1728 // member of the constructor's class or a direct or virtual base 1729 // of that class, the mem-initializer is ill-formed. A 1730 // mem-initializer-list can initialize a base class using any 1731 // name that denotes that base class type. 1732 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1733 1734 if (EllipsisLoc.isValid()) { 1735 // This is a pack expansion. 1736 if (!BaseType->containsUnexpandedParameterPack()) { 1737 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1738 << SourceRange(BaseLoc, RParenLoc); 1739 1740 EllipsisLoc = SourceLocation(); 1741 } 1742 } else { 1743 // Check for any unexpanded parameter packs. 1744 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1745 return true; 1746 1747 for (unsigned I = 0; I != NumArgs; ++I) 1748 if (DiagnoseUnexpandedParameterPack(Args[I])) 1749 return true; 1750 } 1751 1752 // Check for direct and virtual base classes. 1753 const CXXBaseSpecifier *DirectBaseSpec = 0; 1754 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1755 if (!Dependent) { 1756 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1757 BaseType)) 1758 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1759 LParenLoc, RParenLoc, ClassDecl); 1760 1761 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1762 VirtualBaseSpec); 1763 1764 // C++ [base.class.init]p2: 1765 // Unless the mem-initializer-id names a nonstatic data member of the 1766 // constructor's class or a direct or virtual base of that class, the 1767 // mem-initializer is ill-formed. 1768 if (!DirectBaseSpec && !VirtualBaseSpec) { 1769 // If the class has any dependent bases, then it's possible that 1770 // one of those types will resolve to the same type as 1771 // BaseType. Therefore, just treat this as a dependent base 1772 // class initialization. FIXME: Should we try to check the 1773 // initialization anyway? It seems odd. 1774 if (ClassDecl->hasAnyDependentBases()) 1775 Dependent = true; 1776 else 1777 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1778 << BaseType << Context.getTypeDeclType(ClassDecl) 1779 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1780 } 1781 } 1782 1783 if (Dependent) { 1784 // Can't check initialization for a base of dependent type or when 1785 // any of the arguments are type-dependent expressions. 1786 ExprResult BaseInit 1787 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1788 RParenLoc, BaseType)); 1789 1790 DiscardCleanupsInEvaluationContext(); 1791 1792 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1793 /*IsVirtual=*/false, 1794 LParenLoc, 1795 BaseInit.takeAs<Expr>(), 1796 RParenLoc, 1797 EllipsisLoc); 1798 } 1799 1800 // C++ [base.class.init]p2: 1801 // If a mem-initializer-id is ambiguous because it designates both 1802 // a direct non-virtual base class and an inherited virtual base 1803 // class, the mem-initializer is ill-formed. 1804 if (DirectBaseSpec && VirtualBaseSpec) 1805 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1806 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1807 1808 CXXBaseSpecifier *BaseSpec 1809 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1810 if (!BaseSpec) 1811 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1812 1813 // Initialize the base. 1814 InitializedEntity BaseEntity = 1815 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1816 InitializationKind Kind = 1817 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1818 1819 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1820 1821 ExprResult BaseInit = 1822 InitSeq.Perform(*this, BaseEntity, Kind, 1823 MultiExprArg(*this, Args, NumArgs), 0); 1824 if (BaseInit.isInvalid()) 1825 return true; 1826 1827 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1828 1829 // C++0x [class.base.init]p7: 1830 // The initialization of each base and member constitutes a 1831 // full-expression. 1832 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1833 if (BaseInit.isInvalid()) 1834 return true; 1835 1836 // If we are in a dependent context, template instantiation will 1837 // perform this type-checking again. Just save the arguments that we 1838 // received in a ParenListExpr. 1839 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1840 // of the information that we have about the base 1841 // initializer. However, deconstructing the ASTs is a dicey process, 1842 // and this approach is far more likely to get the corner cases right. 1843 if (CurContext->isDependentContext()) { 1844 ExprResult Init 1845 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1846 RParenLoc, BaseType)); 1847 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1848 BaseSpec->isVirtual(), 1849 LParenLoc, 1850 Init.takeAs<Expr>(), 1851 RParenLoc, 1852 EllipsisLoc); 1853 } 1854 1855 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1856 BaseSpec->isVirtual(), 1857 LParenLoc, 1858 BaseInit.takeAs<Expr>(), 1859 RParenLoc, 1860 EllipsisLoc); 1861} 1862 1863// Create a static_cast\<T&&>(expr). 1864static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 1865 QualType ExprType = E->getType(); 1866 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 1867 SourceLocation ExprLoc = E->getLocStart(); 1868 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 1869 TargetType, ExprLoc); 1870 1871 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 1872 SourceRange(ExprLoc, ExprLoc), 1873 E->getSourceRange()).take(); 1874} 1875 1876/// ImplicitInitializerKind - How an implicit base or member initializer should 1877/// initialize its base or member. 1878enum ImplicitInitializerKind { 1879 IIK_Default, 1880 IIK_Copy, 1881 IIK_Move 1882}; 1883 1884static bool 1885BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1886 ImplicitInitializerKind ImplicitInitKind, 1887 CXXBaseSpecifier *BaseSpec, 1888 bool IsInheritedVirtualBase, 1889 CXXCtorInitializer *&CXXBaseInit) { 1890 InitializedEntity InitEntity 1891 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1892 IsInheritedVirtualBase); 1893 1894 ExprResult BaseInit; 1895 1896 switch (ImplicitInitKind) { 1897 case IIK_Default: { 1898 InitializationKind InitKind 1899 = InitializationKind::CreateDefault(Constructor->getLocation()); 1900 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1901 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1902 MultiExprArg(SemaRef, 0, 0)); 1903 break; 1904 } 1905 1906 case IIK_Move: 1907 case IIK_Copy: { 1908 bool Moving = ImplicitInitKind == IIK_Move; 1909 ParmVarDecl *Param = Constructor->getParamDecl(0); 1910 QualType ParamType = Param->getType().getNonReferenceType(); 1911 1912 Expr *CopyCtorArg = 1913 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1914 Constructor->getLocation(), ParamType, 1915 VK_LValue, 0); 1916 1917 // Cast to the base class to avoid ambiguities. 1918 QualType ArgTy = 1919 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1920 ParamType.getQualifiers()); 1921 1922 if (Moving) { 1923 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 1924 } 1925 1926 CXXCastPath BasePath; 1927 BasePath.push_back(BaseSpec); 1928 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1929 CK_UncheckedDerivedToBase, 1930 Moving ? VK_RValue : VK_LValue, 1931 &BasePath).take(); 1932 1933 InitializationKind InitKind 1934 = InitializationKind::CreateDirect(Constructor->getLocation(), 1935 SourceLocation(), SourceLocation()); 1936 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1937 &CopyCtorArg, 1); 1938 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1939 MultiExprArg(&CopyCtorArg, 1)); 1940 break; 1941 } 1942 } 1943 1944 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1945 if (BaseInit.isInvalid()) 1946 return true; 1947 1948 CXXBaseInit = 1949 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1950 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1951 SourceLocation()), 1952 BaseSpec->isVirtual(), 1953 SourceLocation(), 1954 BaseInit.takeAs<Expr>(), 1955 SourceLocation(), 1956 SourceLocation()); 1957 1958 return false; 1959} 1960 1961static bool RefersToRValueRef(Expr *MemRef) { 1962 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 1963 return Referenced->getType()->isRValueReferenceType(); 1964} 1965 1966static bool 1967BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1968 ImplicitInitializerKind ImplicitInitKind, 1969 FieldDecl *Field, IndirectFieldDecl *Indirect, 1970 CXXCtorInitializer *&CXXMemberInit) { 1971 if (Field->isInvalidDecl()) 1972 return true; 1973 1974 SourceLocation Loc = Constructor->getLocation(); 1975 1976 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 1977 bool Moving = ImplicitInitKind == IIK_Move; 1978 ParmVarDecl *Param = Constructor->getParamDecl(0); 1979 QualType ParamType = Param->getType().getNonReferenceType(); 1980 1981 // Suppress copying zero-width bitfields. 1982 if (const Expr *Width = Field->getBitWidth()) 1983 if (Width->EvaluateAsInt(SemaRef.Context) == 0) 1984 return false; 1985 1986 Expr *MemberExprBase = 1987 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1988 Loc, ParamType, VK_LValue, 0); 1989 1990 if (Moving) { 1991 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 1992 } 1993 1994 // Build a reference to this field within the parameter. 1995 CXXScopeSpec SS; 1996 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1997 Sema::LookupMemberName); 1998 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 1999 : cast<ValueDecl>(Field), AS_public); 2000 MemberLookup.resolveKind(); 2001 ExprResult CopyCtorArg 2002 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2003 ParamType, Loc, 2004 /*IsArrow=*/false, 2005 SS, 2006 /*FirstQualifierInScope=*/0, 2007 MemberLookup, 2008 /*TemplateArgs=*/0); 2009 if (CopyCtorArg.isInvalid()) 2010 return true; 2011 2012 // C++11 [class.copy]p15: 2013 // - if a member m has rvalue reference type T&&, it is direct-initialized 2014 // with static_cast<T&&>(x.m); 2015 if (RefersToRValueRef(CopyCtorArg.get())) { 2016 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg.take()); 2017 } 2018 2019 // When the field we are copying is an array, create index variables for 2020 // each dimension of the array. We use these index variables to subscript 2021 // the source array, and other clients (e.g., CodeGen) will perform the 2022 // necessary iteration with these index variables. 2023 SmallVector<VarDecl *, 4> IndexVariables; 2024 QualType BaseType = Field->getType(); 2025 QualType SizeType = SemaRef.Context.getSizeType(); 2026 bool InitializingArray = false; 2027 while (const ConstantArrayType *Array 2028 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2029 InitializingArray = true; 2030 // Create the iteration variable for this array index. 2031 IdentifierInfo *IterationVarName = 0; 2032 { 2033 llvm::SmallString<8> Str; 2034 llvm::raw_svector_ostream OS(Str); 2035 OS << "__i" << IndexVariables.size(); 2036 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2037 } 2038 VarDecl *IterationVar 2039 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2040 IterationVarName, SizeType, 2041 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2042 SC_None, SC_None); 2043 IndexVariables.push_back(IterationVar); 2044 2045 // Create a reference to the iteration variable. 2046 ExprResult IterationVarRef 2047 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2048 assert(!IterationVarRef.isInvalid() && 2049 "Reference to invented variable cannot fail!"); 2050 2051 // Subscript the array with this iteration variable. 2052 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 2053 Loc, 2054 IterationVarRef.take(), 2055 Loc); 2056 if (CopyCtorArg.isInvalid()) 2057 return true; 2058 2059 BaseType = Array->getElementType(); 2060 } 2061 2062 // The array subscript expression is an lvalue, which is wrong for moving. 2063 if (Moving && InitializingArray) 2064 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg.take()); 2065 2066 // Construct the entity that we will be initializing. For an array, this 2067 // will be first element in the array, which may require several levels 2068 // of array-subscript entities. 2069 SmallVector<InitializedEntity, 4> Entities; 2070 Entities.reserve(1 + IndexVariables.size()); 2071 if (Indirect) 2072 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2073 else 2074 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2075 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2076 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2077 0, 2078 Entities.back())); 2079 2080 // Direct-initialize to use the copy constructor. 2081 InitializationKind InitKind = 2082 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2083 2084 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 2085 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2086 &CopyCtorArgE, 1); 2087 2088 ExprResult MemberInit 2089 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2090 MultiExprArg(&CopyCtorArgE, 1)); 2091 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2092 if (MemberInit.isInvalid()) 2093 return true; 2094 2095 if (Indirect) { 2096 assert(IndexVariables.size() == 0 && 2097 "Indirect field improperly initialized"); 2098 CXXMemberInit 2099 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2100 Loc, Loc, 2101 MemberInit.takeAs<Expr>(), 2102 Loc); 2103 } else 2104 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2105 Loc, MemberInit.takeAs<Expr>(), 2106 Loc, 2107 IndexVariables.data(), 2108 IndexVariables.size()); 2109 return false; 2110 } 2111 2112 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2113 2114 QualType FieldBaseElementType = 2115 SemaRef.Context.getBaseElementType(Field->getType()); 2116 2117 if (FieldBaseElementType->isRecordType()) { 2118 InitializedEntity InitEntity 2119 = Indirect? InitializedEntity::InitializeMember(Indirect) 2120 : InitializedEntity::InitializeMember(Field); 2121 InitializationKind InitKind = 2122 InitializationKind::CreateDefault(Loc); 2123 2124 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2125 ExprResult MemberInit = 2126 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2127 2128 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2129 if (MemberInit.isInvalid()) 2130 return true; 2131 2132 if (Indirect) 2133 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2134 Indirect, Loc, 2135 Loc, 2136 MemberInit.get(), 2137 Loc); 2138 else 2139 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2140 Field, Loc, Loc, 2141 MemberInit.get(), 2142 Loc); 2143 return false; 2144 } 2145 2146 if (!Field->getParent()->isUnion()) { 2147 if (FieldBaseElementType->isReferenceType()) { 2148 SemaRef.Diag(Constructor->getLocation(), 2149 diag::err_uninitialized_member_in_ctor) 2150 << (int)Constructor->isImplicit() 2151 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2152 << 0 << Field->getDeclName(); 2153 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2154 return true; 2155 } 2156 2157 if (FieldBaseElementType.isConstQualified()) { 2158 SemaRef.Diag(Constructor->getLocation(), 2159 diag::err_uninitialized_member_in_ctor) 2160 << (int)Constructor->isImplicit() 2161 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2162 << 1 << Field->getDeclName(); 2163 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2164 return true; 2165 } 2166 } 2167 2168 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2169 FieldBaseElementType->isObjCRetainableType() && 2170 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2171 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2172 // Instant objects: 2173 // Default-initialize Objective-C pointers to NULL. 2174 CXXMemberInit 2175 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2176 Loc, Loc, 2177 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2178 Loc); 2179 return false; 2180 } 2181 2182 // Nothing to initialize. 2183 CXXMemberInit = 0; 2184 return false; 2185} 2186 2187namespace { 2188struct BaseAndFieldInfo { 2189 Sema &S; 2190 CXXConstructorDecl *Ctor; 2191 bool AnyErrorsInInits; 2192 ImplicitInitializerKind IIK; 2193 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2194 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2195 2196 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2197 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2198 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2199 if (Generated && Ctor->isCopyConstructor()) 2200 IIK = IIK_Copy; 2201 else if (Generated && Ctor->isMoveConstructor()) 2202 IIK = IIK_Move; 2203 else 2204 IIK = IIK_Default; 2205 } 2206}; 2207} 2208 2209static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2210 FieldDecl *Field, 2211 IndirectFieldDecl *Indirect = 0) { 2212 2213 // Overwhelmingly common case: we have a direct initializer for this field. 2214 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2215 Info.AllToInit.push_back(Init); 2216 return false; 2217 } 2218 2219 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2220 // has a brace-or-equal-initializer, the entity is initialized as specified 2221 // in [dcl.init]. 2222 if (Field->hasInClassInitializer()) { 2223 CXXCtorInitializer *Init; 2224 if (Indirect) 2225 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2226 SourceLocation(), 2227 SourceLocation(), 0, 2228 SourceLocation()); 2229 else 2230 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2231 SourceLocation(), 2232 SourceLocation(), 0, 2233 SourceLocation()); 2234 Info.AllToInit.push_back(Init); 2235 return false; 2236 } 2237 2238 // Don't try to build an implicit initializer if there were semantic 2239 // errors in any of the initializers (and therefore we might be 2240 // missing some that the user actually wrote). 2241 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2242 return false; 2243 2244 CXXCtorInitializer *Init = 0; 2245 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2246 Indirect, Init)) 2247 return true; 2248 2249 if (Init) 2250 Info.AllToInit.push_back(Init); 2251 2252 return false; 2253} 2254 2255bool 2256Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2257 CXXCtorInitializer *Initializer) { 2258 assert(Initializer->isDelegatingInitializer()); 2259 Constructor->setNumCtorInitializers(1); 2260 CXXCtorInitializer **initializer = 2261 new (Context) CXXCtorInitializer*[1]; 2262 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2263 Constructor->setCtorInitializers(initializer); 2264 2265 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2266 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2267 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2268 } 2269 2270 DelegatingCtorDecls.push_back(Constructor); 2271 2272 return false; 2273} 2274 2275/// \brief Determine whether the given indirect field declaration is somewhere 2276/// within an anonymous union. 2277static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2278 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2279 CEnd = F->chain_end(); 2280 C != CEnd; ++C) 2281 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2282 if (Record->isUnion()) 2283 return true; 2284 2285 return false; 2286} 2287 2288bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2289 CXXCtorInitializer **Initializers, 2290 unsigned NumInitializers, 2291 bool AnyErrors) { 2292 if (Constructor->getDeclContext()->isDependentContext()) { 2293 // Just store the initializers as written, they will be checked during 2294 // instantiation. 2295 if (NumInitializers > 0) { 2296 Constructor->setNumCtorInitializers(NumInitializers); 2297 CXXCtorInitializer **baseOrMemberInitializers = 2298 new (Context) CXXCtorInitializer*[NumInitializers]; 2299 memcpy(baseOrMemberInitializers, Initializers, 2300 NumInitializers * sizeof(CXXCtorInitializer*)); 2301 Constructor->setCtorInitializers(baseOrMemberInitializers); 2302 } 2303 2304 return false; 2305 } 2306 2307 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2308 2309 // We need to build the initializer AST according to order of construction 2310 // and not what user specified in the Initializers list. 2311 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2312 if (!ClassDecl) 2313 return true; 2314 2315 bool HadError = false; 2316 2317 for (unsigned i = 0; i < NumInitializers; i++) { 2318 CXXCtorInitializer *Member = Initializers[i]; 2319 2320 if (Member->isBaseInitializer()) 2321 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2322 else 2323 Info.AllBaseFields[Member->getAnyMember()] = Member; 2324 } 2325 2326 // Keep track of the direct virtual bases. 2327 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2328 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2329 E = ClassDecl->bases_end(); I != E; ++I) { 2330 if (I->isVirtual()) 2331 DirectVBases.insert(I); 2332 } 2333 2334 // Push virtual bases before others. 2335 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2336 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2337 2338 if (CXXCtorInitializer *Value 2339 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2340 Info.AllToInit.push_back(Value); 2341 } else if (!AnyErrors) { 2342 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2343 CXXCtorInitializer *CXXBaseInit; 2344 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2345 VBase, IsInheritedVirtualBase, 2346 CXXBaseInit)) { 2347 HadError = true; 2348 continue; 2349 } 2350 2351 Info.AllToInit.push_back(CXXBaseInit); 2352 } 2353 } 2354 2355 // Non-virtual bases. 2356 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2357 E = ClassDecl->bases_end(); Base != E; ++Base) { 2358 // Virtuals are in the virtual base list and already constructed. 2359 if (Base->isVirtual()) 2360 continue; 2361 2362 if (CXXCtorInitializer *Value 2363 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2364 Info.AllToInit.push_back(Value); 2365 } else if (!AnyErrors) { 2366 CXXCtorInitializer *CXXBaseInit; 2367 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2368 Base, /*IsInheritedVirtualBase=*/false, 2369 CXXBaseInit)) { 2370 HadError = true; 2371 continue; 2372 } 2373 2374 Info.AllToInit.push_back(CXXBaseInit); 2375 } 2376 } 2377 2378 // Fields. 2379 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2380 MemEnd = ClassDecl->decls_end(); 2381 Mem != MemEnd; ++Mem) { 2382 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2383 if (F->getType()->isIncompleteArrayType()) { 2384 assert(ClassDecl->hasFlexibleArrayMember() && 2385 "Incomplete array type is not valid"); 2386 continue; 2387 } 2388 2389 // If we're not generating the implicit copy/move constructor, then we'll 2390 // handle anonymous struct/union fields based on their individual 2391 // indirect fields. 2392 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2393 continue; 2394 2395 if (CollectFieldInitializer(*this, Info, F)) 2396 HadError = true; 2397 continue; 2398 } 2399 2400 // Beyond this point, we only consider default initialization. 2401 if (Info.IIK != IIK_Default) 2402 continue; 2403 2404 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2405 if (F->getType()->isIncompleteArrayType()) { 2406 assert(ClassDecl->hasFlexibleArrayMember() && 2407 "Incomplete array type is not valid"); 2408 continue; 2409 } 2410 2411 // If this field is somewhere within an anonymous union, we only 2412 // initialize it if there's an explicit initializer. 2413 if (isWithinAnonymousUnion(F)) { 2414 if (CXXCtorInitializer *Init 2415 = Info.AllBaseFields.lookup(F->getAnonField())) { 2416 Info.AllToInit.push_back(Init); 2417 } 2418 2419 continue; 2420 } 2421 2422 // Initialize each field of an anonymous struct individually. 2423 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2424 HadError = true; 2425 2426 continue; 2427 } 2428 } 2429 2430 NumInitializers = Info.AllToInit.size(); 2431 if (NumInitializers > 0) { 2432 Constructor->setNumCtorInitializers(NumInitializers); 2433 CXXCtorInitializer **baseOrMemberInitializers = 2434 new (Context) CXXCtorInitializer*[NumInitializers]; 2435 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2436 NumInitializers * sizeof(CXXCtorInitializer*)); 2437 Constructor->setCtorInitializers(baseOrMemberInitializers); 2438 2439 // Constructors implicitly reference the base and member 2440 // destructors. 2441 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2442 Constructor->getParent()); 2443 } 2444 2445 return HadError; 2446} 2447 2448static void *GetKeyForTopLevelField(FieldDecl *Field) { 2449 // For anonymous unions, use the class declaration as the key. 2450 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2451 if (RT->getDecl()->isAnonymousStructOrUnion()) 2452 return static_cast<void *>(RT->getDecl()); 2453 } 2454 return static_cast<void *>(Field); 2455} 2456 2457static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2458 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2459} 2460 2461static void *GetKeyForMember(ASTContext &Context, 2462 CXXCtorInitializer *Member) { 2463 if (!Member->isAnyMemberInitializer()) 2464 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2465 2466 // For fields injected into the class via declaration of an anonymous union, 2467 // use its anonymous union class declaration as the unique key. 2468 FieldDecl *Field = Member->getAnyMember(); 2469 2470 // If the field is a member of an anonymous struct or union, our key 2471 // is the anonymous record decl that's a direct child of the class. 2472 RecordDecl *RD = Field->getParent(); 2473 if (RD->isAnonymousStructOrUnion()) { 2474 while (true) { 2475 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2476 if (Parent->isAnonymousStructOrUnion()) 2477 RD = Parent; 2478 else 2479 break; 2480 } 2481 2482 return static_cast<void *>(RD); 2483 } 2484 2485 return static_cast<void *>(Field); 2486} 2487 2488static void 2489DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2490 const CXXConstructorDecl *Constructor, 2491 CXXCtorInitializer **Inits, 2492 unsigned NumInits) { 2493 if (Constructor->getDeclContext()->isDependentContext()) 2494 return; 2495 2496 // Don't check initializers order unless the warning is enabled at the 2497 // location of at least one initializer. 2498 bool ShouldCheckOrder = false; 2499 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2500 CXXCtorInitializer *Init = Inits[InitIndex]; 2501 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2502 Init->getSourceLocation()) 2503 != Diagnostic::Ignored) { 2504 ShouldCheckOrder = true; 2505 break; 2506 } 2507 } 2508 if (!ShouldCheckOrder) 2509 return; 2510 2511 // Build the list of bases and members in the order that they'll 2512 // actually be initialized. The explicit initializers should be in 2513 // this same order but may be missing things. 2514 SmallVector<const void*, 32> IdealInitKeys; 2515 2516 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2517 2518 // 1. Virtual bases. 2519 for (CXXRecordDecl::base_class_const_iterator VBase = 2520 ClassDecl->vbases_begin(), 2521 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2522 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2523 2524 // 2. Non-virtual bases. 2525 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2526 E = ClassDecl->bases_end(); Base != E; ++Base) { 2527 if (Base->isVirtual()) 2528 continue; 2529 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2530 } 2531 2532 // 3. Direct fields. 2533 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2534 E = ClassDecl->field_end(); Field != E; ++Field) 2535 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2536 2537 unsigned NumIdealInits = IdealInitKeys.size(); 2538 unsigned IdealIndex = 0; 2539 2540 CXXCtorInitializer *PrevInit = 0; 2541 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2542 CXXCtorInitializer *Init = Inits[InitIndex]; 2543 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2544 2545 // Scan forward to try to find this initializer in the idealized 2546 // initializers list. 2547 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2548 if (InitKey == IdealInitKeys[IdealIndex]) 2549 break; 2550 2551 // If we didn't find this initializer, it must be because we 2552 // scanned past it on a previous iteration. That can only 2553 // happen if we're out of order; emit a warning. 2554 if (IdealIndex == NumIdealInits && PrevInit) { 2555 Sema::SemaDiagnosticBuilder D = 2556 SemaRef.Diag(PrevInit->getSourceLocation(), 2557 diag::warn_initializer_out_of_order); 2558 2559 if (PrevInit->isAnyMemberInitializer()) 2560 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2561 else 2562 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2563 2564 if (Init->isAnyMemberInitializer()) 2565 D << 0 << Init->getAnyMember()->getDeclName(); 2566 else 2567 D << 1 << Init->getBaseClassInfo()->getType(); 2568 2569 // Move back to the initializer's location in the ideal list. 2570 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2571 if (InitKey == IdealInitKeys[IdealIndex]) 2572 break; 2573 2574 assert(IdealIndex != NumIdealInits && 2575 "initializer not found in initializer list"); 2576 } 2577 2578 PrevInit = Init; 2579 } 2580} 2581 2582namespace { 2583bool CheckRedundantInit(Sema &S, 2584 CXXCtorInitializer *Init, 2585 CXXCtorInitializer *&PrevInit) { 2586 if (!PrevInit) { 2587 PrevInit = Init; 2588 return false; 2589 } 2590 2591 if (FieldDecl *Field = Init->getMember()) 2592 S.Diag(Init->getSourceLocation(), 2593 diag::err_multiple_mem_initialization) 2594 << Field->getDeclName() 2595 << Init->getSourceRange(); 2596 else { 2597 const Type *BaseClass = Init->getBaseClass(); 2598 assert(BaseClass && "neither field nor base"); 2599 S.Diag(Init->getSourceLocation(), 2600 diag::err_multiple_base_initialization) 2601 << QualType(BaseClass, 0) 2602 << Init->getSourceRange(); 2603 } 2604 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2605 << 0 << PrevInit->getSourceRange(); 2606 2607 return true; 2608} 2609 2610typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2611typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2612 2613bool CheckRedundantUnionInit(Sema &S, 2614 CXXCtorInitializer *Init, 2615 RedundantUnionMap &Unions) { 2616 FieldDecl *Field = Init->getAnyMember(); 2617 RecordDecl *Parent = Field->getParent(); 2618 if (!Parent->isAnonymousStructOrUnion()) 2619 return false; 2620 2621 NamedDecl *Child = Field; 2622 do { 2623 if (Parent->isUnion()) { 2624 UnionEntry &En = Unions[Parent]; 2625 if (En.first && En.first != Child) { 2626 S.Diag(Init->getSourceLocation(), 2627 diag::err_multiple_mem_union_initialization) 2628 << Field->getDeclName() 2629 << Init->getSourceRange(); 2630 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2631 << 0 << En.second->getSourceRange(); 2632 return true; 2633 } else if (!En.first) { 2634 En.first = Child; 2635 En.second = Init; 2636 } 2637 } 2638 2639 Child = Parent; 2640 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2641 } while (Parent->isAnonymousStructOrUnion()); 2642 2643 return false; 2644} 2645} 2646 2647/// ActOnMemInitializers - Handle the member initializers for a constructor. 2648void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2649 SourceLocation ColonLoc, 2650 MemInitTy **meminits, unsigned NumMemInits, 2651 bool AnyErrors) { 2652 if (!ConstructorDecl) 2653 return; 2654 2655 AdjustDeclIfTemplate(ConstructorDecl); 2656 2657 CXXConstructorDecl *Constructor 2658 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2659 2660 if (!Constructor) { 2661 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2662 return; 2663 } 2664 2665 CXXCtorInitializer **MemInits = 2666 reinterpret_cast<CXXCtorInitializer **>(meminits); 2667 2668 // Mapping for the duplicate initializers check. 2669 // For member initializers, this is keyed with a FieldDecl*. 2670 // For base initializers, this is keyed with a Type*. 2671 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2672 2673 // Mapping for the inconsistent anonymous-union initializers check. 2674 RedundantUnionMap MemberUnions; 2675 2676 bool HadError = false; 2677 for (unsigned i = 0; i < NumMemInits; i++) { 2678 CXXCtorInitializer *Init = MemInits[i]; 2679 2680 // Set the source order index. 2681 Init->setSourceOrder(i); 2682 2683 if (Init->isAnyMemberInitializer()) { 2684 FieldDecl *Field = Init->getAnyMember(); 2685 if (CheckRedundantInit(*this, Init, Members[Field]) || 2686 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2687 HadError = true; 2688 } else if (Init->isBaseInitializer()) { 2689 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2690 if (CheckRedundantInit(*this, Init, Members[Key])) 2691 HadError = true; 2692 } else { 2693 assert(Init->isDelegatingInitializer()); 2694 // This must be the only initializer 2695 if (i != 0 || NumMemInits > 1) { 2696 Diag(MemInits[0]->getSourceLocation(), 2697 diag::err_delegating_initializer_alone) 2698 << MemInits[0]->getSourceRange(); 2699 HadError = true; 2700 // We will treat this as being the only initializer. 2701 } 2702 SetDelegatingInitializer(Constructor, MemInits[i]); 2703 // Return immediately as the initializer is set. 2704 return; 2705 } 2706 } 2707 2708 if (HadError) 2709 return; 2710 2711 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2712 2713 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2714} 2715 2716void 2717Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2718 CXXRecordDecl *ClassDecl) { 2719 // Ignore dependent contexts. 2720 if (ClassDecl->isDependentContext()) 2721 return; 2722 2723 // FIXME: all the access-control diagnostics are positioned on the 2724 // field/base declaration. That's probably good; that said, the 2725 // user might reasonably want to know why the destructor is being 2726 // emitted, and we currently don't say. 2727 2728 // Non-static data members. 2729 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2730 E = ClassDecl->field_end(); I != E; ++I) { 2731 FieldDecl *Field = *I; 2732 if (Field->isInvalidDecl()) 2733 continue; 2734 QualType FieldType = Context.getBaseElementType(Field->getType()); 2735 2736 const RecordType* RT = FieldType->getAs<RecordType>(); 2737 if (!RT) 2738 continue; 2739 2740 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2741 if (FieldClassDecl->isInvalidDecl()) 2742 continue; 2743 if (FieldClassDecl->hasTrivialDestructor()) 2744 continue; 2745 2746 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2747 assert(Dtor && "No dtor found for FieldClassDecl!"); 2748 CheckDestructorAccess(Field->getLocation(), Dtor, 2749 PDiag(diag::err_access_dtor_field) 2750 << Field->getDeclName() 2751 << FieldType); 2752 2753 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2754 } 2755 2756 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2757 2758 // Bases. 2759 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2760 E = ClassDecl->bases_end(); Base != E; ++Base) { 2761 // Bases are always records in a well-formed non-dependent class. 2762 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2763 2764 // Remember direct virtual bases. 2765 if (Base->isVirtual()) 2766 DirectVirtualBases.insert(RT); 2767 2768 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2769 // If our base class is invalid, we probably can't get its dtor anyway. 2770 if (BaseClassDecl->isInvalidDecl()) 2771 continue; 2772 // Ignore trivial destructors. 2773 if (BaseClassDecl->hasTrivialDestructor()) 2774 continue; 2775 2776 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2777 assert(Dtor && "No dtor found for BaseClassDecl!"); 2778 2779 // FIXME: caret should be on the start of the class name 2780 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2781 PDiag(diag::err_access_dtor_base) 2782 << Base->getType() 2783 << Base->getSourceRange()); 2784 2785 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2786 } 2787 2788 // Virtual bases. 2789 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2790 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2791 2792 // Bases are always records in a well-formed non-dependent class. 2793 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2794 2795 // Ignore direct virtual bases. 2796 if (DirectVirtualBases.count(RT)) 2797 continue; 2798 2799 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2800 // If our base class is invalid, we probably can't get its dtor anyway. 2801 if (BaseClassDecl->isInvalidDecl()) 2802 continue; 2803 // Ignore trivial destructors. 2804 if (BaseClassDecl->hasTrivialDestructor()) 2805 continue; 2806 2807 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2808 assert(Dtor && "No dtor found for BaseClassDecl!"); 2809 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2810 PDiag(diag::err_access_dtor_vbase) 2811 << VBase->getType()); 2812 2813 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2814 } 2815} 2816 2817void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2818 if (!CDtorDecl) 2819 return; 2820 2821 if (CXXConstructorDecl *Constructor 2822 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2823 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2824} 2825 2826bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2827 unsigned DiagID, AbstractDiagSelID SelID) { 2828 if (SelID == -1) 2829 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2830 else 2831 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2832} 2833 2834bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2835 const PartialDiagnostic &PD) { 2836 if (!getLangOptions().CPlusPlus) 2837 return false; 2838 2839 if (const ArrayType *AT = Context.getAsArrayType(T)) 2840 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2841 2842 if (const PointerType *PT = T->getAs<PointerType>()) { 2843 // Find the innermost pointer type. 2844 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2845 PT = T; 2846 2847 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2848 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2849 } 2850 2851 const RecordType *RT = T->getAs<RecordType>(); 2852 if (!RT) 2853 return false; 2854 2855 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2856 2857 // We can't answer whether something is abstract until it has a 2858 // definition. If it's currently being defined, we'll walk back 2859 // over all the declarations when we have a full definition. 2860 const CXXRecordDecl *Def = RD->getDefinition(); 2861 if (!Def || Def->isBeingDefined()) 2862 return false; 2863 2864 if (!RD->isAbstract()) 2865 return false; 2866 2867 Diag(Loc, PD) << RD->getDeclName(); 2868 DiagnoseAbstractType(RD); 2869 2870 return true; 2871} 2872 2873void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2874 // Check if we've already emitted the list of pure virtual functions 2875 // for this class. 2876 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2877 return; 2878 2879 CXXFinalOverriderMap FinalOverriders; 2880 RD->getFinalOverriders(FinalOverriders); 2881 2882 // Keep a set of seen pure methods so we won't diagnose the same method 2883 // more than once. 2884 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2885 2886 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2887 MEnd = FinalOverriders.end(); 2888 M != MEnd; 2889 ++M) { 2890 for (OverridingMethods::iterator SO = M->second.begin(), 2891 SOEnd = M->second.end(); 2892 SO != SOEnd; ++SO) { 2893 // C++ [class.abstract]p4: 2894 // A class is abstract if it contains or inherits at least one 2895 // pure virtual function for which the final overrider is pure 2896 // virtual. 2897 2898 // 2899 if (SO->second.size() != 1) 2900 continue; 2901 2902 if (!SO->second.front().Method->isPure()) 2903 continue; 2904 2905 if (!SeenPureMethods.insert(SO->second.front().Method)) 2906 continue; 2907 2908 Diag(SO->second.front().Method->getLocation(), 2909 diag::note_pure_virtual_function) 2910 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2911 } 2912 } 2913 2914 if (!PureVirtualClassDiagSet) 2915 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2916 PureVirtualClassDiagSet->insert(RD); 2917} 2918 2919namespace { 2920struct AbstractUsageInfo { 2921 Sema &S; 2922 CXXRecordDecl *Record; 2923 CanQualType AbstractType; 2924 bool Invalid; 2925 2926 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2927 : S(S), Record(Record), 2928 AbstractType(S.Context.getCanonicalType( 2929 S.Context.getTypeDeclType(Record))), 2930 Invalid(false) {} 2931 2932 void DiagnoseAbstractType() { 2933 if (Invalid) return; 2934 S.DiagnoseAbstractType(Record); 2935 Invalid = true; 2936 } 2937 2938 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2939}; 2940 2941struct CheckAbstractUsage { 2942 AbstractUsageInfo &Info; 2943 const NamedDecl *Ctx; 2944 2945 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2946 : Info(Info), Ctx(Ctx) {} 2947 2948 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2949 switch (TL.getTypeLocClass()) { 2950#define ABSTRACT_TYPELOC(CLASS, PARENT) 2951#define TYPELOC(CLASS, PARENT) \ 2952 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2953#include "clang/AST/TypeLocNodes.def" 2954 } 2955 } 2956 2957 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2958 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2959 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2960 if (!TL.getArg(I)) 2961 continue; 2962 2963 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2964 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2965 } 2966 } 2967 2968 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2969 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2970 } 2971 2972 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2973 // Visit the type parameters from a permissive context. 2974 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2975 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2976 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2977 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2978 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2979 // TODO: other template argument types? 2980 } 2981 } 2982 2983 // Visit pointee types from a permissive context. 2984#define CheckPolymorphic(Type) \ 2985 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2986 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2987 } 2988 CheckPolymorphic(PointerTypeLoc) 2989 CheckPolymorphic(ReferenceTypeLoc) 2990 CheckPolymorphic(MemberPointerTypeLoc) 2991 CheckPolymorphic(BlockPointerTypeLoc) 2992 2993 /// Handle all the types we haven't given a more specific 2994 /// implementation for above. 2995 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2996 // Every other kind of type that we haven't called out already 2997 // that has an inner type is either (1) sugar or (2) contains that 2998 // inner type in some way as a subobject. 2999 if (TypeLoc Next = TL.getNextTypeLoc()) 3000 return Visit(Next, Sel); 3001 3002 // If there's no inner type and we're in a permissive context, 3003 // don't diagnose. 3004 if (Sel == Sema::AbstractNone) return; 3005 3006 // Check whether the type matches the abstract type. 3007 QualType T = TL.getType(); 3008 if (T->isArrayType()) { 3009 Sel = Sema::AbstractArrayType; 3010 T = Info.S.Context.getBaseElementType(T); 3011 } 3012 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3013 if (CT != Info.AbstractType) return; 3014 3015 // It matched; do some magic. 3016 if (Sel == Sema::AbstractArrayType) { 3017 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3018 << T << TL.getSourceRange(); 3019 } else { 3020 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3021 << Sel << T << TL.getSourceRange(); 3022 } 3023 Info.DiagnoseAbstractType(); 3024 } 3025}; 3026 3027void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3028 Sema::AbstractDiagSelID Sel) { 3029 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3030} 3031 3032} 3033 3034/// Check for invalid uses of an abstract type in a method declaration. 3035static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3036 CXXMethodDecl *MD) { 3037 // No need to do the check on definitions, which require that 3038 // the return/param types be complete. 3039 if (MD->doesThisDeclarationHaveABody()) 3040 return; 3041 3042 // For safety's sake, just ignore it if we don't have type source 3043 // information. This should never happen for non-implicit methods, 3044 // but... 3045 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3046 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3047} 3048 3049/// Check for invalid uses of an abstract type within a class definition. 3050static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3051 CXXRecordDecl *RD) { 3052 for (CXXRecordDecl::decl_iterator 3053 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3054 Decl *D = *I; 3055 if (D->isImplicit()) continue; 3056 3057 // Methods and method templates. 3058 if (isa<CXXMethodDecl>(D)) { 3059 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3060 } else if (isa<FunctionTemplateDecl>(D)) { 3061 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3062 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3063 3064 // Fields and static variables. 3065 } else if (isa<FieldDecl>(D)) { 3066 FieldDecl *FD = cast<FieldDecl>(D); 3067 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3068 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3069 } else if (isa<VarDecl>(D)) { 3070 VarDecl *VD = cast<VarDecl>(D); 3071 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3072 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3073 3074 // Nested classes and class templates. 3075 } else if (isa<CXXRecordDecl>(D)) { 3076 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3077 } else if (isa<ClassTemplateDecl>(D)) { 3078 CheckAbstractClassUsage(Info, 3079 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3080 } 3081 } 3082} 3083 3084/// \brief Perform semantic checks on a class definition that has been 3085/// completing, introducing implicitly-declared members, checking for 3086/// abstract types, etc. 3087void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3088 if (!Record) 3089 return; 3090 3091 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3092 AbstractUsageInfo Info(*this, Record); 3093 CheckAbstractClassUsage(Info, Record); 3094 } 3095 3096 // If this is not an aggregate type and has no user-declared constructor, 3097 // complain about any non-static data members of reference or const scalar 3098 // type, since they will never get initializers. 3099 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3100 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3101 bool Complained = false; 3102 for (RecordDecl::field_iterator F = Record->field_begin(), 3103 FEnd = Record->field_end(); 3104 F != FEnd; ++F) { 3105 if (F->hasInClassInitializer()) 3106 continue; 3107 3108 if (F->getType()->isReferenceType() || 3109 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3110 if (!Complained) { 3111 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3112 << Record->getTagKind() << Record; 3113 Complained = true; 3114 } 3115 3116 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3117 << F->getType()->isReferenceType() 3118 << F->getDeclName(); 3119 } 3120 } 3121 } 3122 3123 if (Record->isDynamicClass() && !Record->isDependentType()) 3124 DynamicClasses.push_back(Record); 3125 3126 if (Record->getIdentifier()) { 3127 // C++ [class.mem]p13: 3128 // If T is the name of a class, then each of the following shall have a 3129 // name different from T: 3130 // - every member of every anonymous union that is a member of class T. 3131 // 3132 // C++ [class.mem]p14: 3133 // In addition, if class T has a user-declared constructor (12.1), every 3134 // non-static data member of class T shall have a name different from T. 3135 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3136 R.first != R.second; ++R.first) { 3137 NamedDecl *D = *R.first; 3138 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3139 isa<IndirectFieldDecl>(D)) { 3140 Diag(D->getLocation(), diag::err_member_name_of_class) 3141 << D->getDeclName(); 3142 break; 3143 } 3144 } 3145 } 3146 3147 // Warn if the class has virtual methods but non-virtual public destructor. 3148 if (Record->isPolymorphic() && !Record->isDependentType()) { 3149 CXXDestructorDecl *dtor = Record->getDestructor(); 3150 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3151 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3152 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3153 } 3154 3155 // See if a method overloads virtual methods in a base 3156 /// class without overriding any. 3157 if (!Record->isDependentType()) { 3158 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3159 MEnd = Record->method_end(); 3160 M != MEnd; ++M) { 3161 if (!(*M)->isStatic()) 3162 DiagnoseHiddenVirtualMethods(Record, *M); 3163 } 3164 } 3165 3166 // Declare inherited constructors. We do this eagerly here because: 3167 // - The standard requires an eager diagnostic for conflicting inherited 3168 // constructors from different classes. 3169 // - The lazy declaration of the other implicit constructors is so as to not 3170 // waste space and performance on classes that are not meant to be 3171 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3172 // have inherited constructors. 3173 DeclareInheritedConstructors(Record); 3174 3175 if (!Record->isDependentType()) 3176 CheckExplicitlyDefaultedMethods(Record); 3177} 3178 3179void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3180 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3181 ME = Record->method_end(); 3182 MI != ME; ++MI) { 3183 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3184 switch (getSpecialMember(*MI)) { 3185 case CXXDefaultConstructor: 3186 CheckExplicitlyDefaultedDefaultConstructor( 3187 cast<CXXConstructorDecl>(*MI)); 3188 break; 3189 3190 case CXXDestructor: 3191 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3192 break; 3193 3194 case CXXCopyConstructor: 3195 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3196 break; 3197 3198 case CXXCopyAssignment: 3199 CheckExplicitlyDefaultedCopyAssignment(*MI); 3200 break; 3201 3202 case CXXMoveConstructor: 3203 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3204 break; 3205 3206 case CXXMoveAssignment: 3207 CheckExplicitlyDefaultedMoveAssignment(*MI); 3208 break; 3209 3210 case CXXInvalid: 3211 llvm_unreachable("non-special member explicitly defaulted!"); 3212 } 3213 } 3214 } 3215 3216} 3217 3218void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3219 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3220 3221 // Whether this was the first-declared instance of the constructor. 3222 // This affects whether we implicitly add an exception spec (and, eventually, 3223 // constexpr). It is also ill-formed to explicitly default a constructor such 3224 // that it would be deleted. (C++0x [decl.fct.def.default]) 3225 bool First = CD == CD->getCanonicalDecl(); 3226 3227 bool HadError = false; 3228 if (CD->getNumParams() != 0) { 3229 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3230 << CD->getSourceRange(); 3231 HadError = true; 3232 } 3233 3234 ImplicitExceptionSpecification Spec 3235 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3236 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3237 if (EPI.ExceptionSpecType == EST_Delayed) { 3238 // Exception specification depends on some deferred part of the class. We'll 3239 // try again when the class's definition has been fully processed. 3240 return; 3241 } 3242 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3243 *ExceptionType = Context.getFunctionType( 3244 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3245 3246 if (CtorType->hasExceptionSpec()) { 3247 if (CheckEquivalentExceptionSpec( 3248 PDiag(diag::err_incorrect_defaulted_exception_spec) 3249 << CXXDefaultConstructor, 3250 PDiag(), 3251 ExceptionType, SourceLocation(), 3252 CtorType, CD->getLocation())) { 3253 HadError = true; 3254 } 3255 } else if (First) { 3256 // We set the declaration to have the computed exception spec here. 3257 // We know there are no parameters. 3258 EPI.ExtInfo = CtorType->getExtInfo(); 3259 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3260 } 3261 3262 if (HadError) { 3263 CD->setInvalidDecl(); 3264 return; 3265 } 3266 3267 if (ShouldDeleteDefaultConstructor(CD)) { 3268 if (First) { 3269 CD->setDeletedAsWritten(); 3270 } else { 3271 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3272 << CXXDefaultConstructor; 3273 CD->setInvalidDecl(); 3274 } 3275 } 3276} 3277 3278void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3279 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3280 3281 // Whether this was the first-declared instance of the constructor. 3282 bool First = CD == CD->getCanonicalDecl(); 3283 3284 bool HadError = false; 3285 if (CD->getNumParams() != 1) { 3286 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3287 << CD->getSourceRange(); 3288 HadError = true; 3289 } 3290 3291 ImplicitExceptionSpecification Spec(Context); 3292 bool Const; 3293 llvm::tie(Spec, Const) = 3294 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3295 3296 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3297 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3298 *ExceptionType = Context.getFunctionType( 3299 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3300 3301 // Check for parameter type matching. 3302 // This is a copy ctor so we know it's a cv-qualified reference to T. 3303 QualType ArgType = CtorType->getArgType(0); 3304 if (ArgType->getPointeeType().isVolatileQualified()) { 3305 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3306 HadError = true; 3307 } 3308 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3309 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3310 HadError = true; 3311 } 3312 3313 if (CtorType->hasExceptionSpec()) { 3314 if (CheckEquivalentExceptionSpec( 3315 PDiag(diag::err_incorrect_defaulted_exception_spec) 3316 << CXXCopyConstructor, 3317 PDiag(), 3318 ExceptionType, SourceLocation(), 3319 CtorType, CD->getLocation())) { 3320 HadError = true; 3321 } 3322 } else if (First) { 3323 // We set the declaration to have the computed exception spec here. 3324 // We duplicate the one parameter type. 3325 EPI.ExtInfo = CtorType->getExtInfo(); 3326 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3327 } 3328 3329 if (HadError) { 3330 CD->setInvalidDecl(); 3331 return; 3332 } 3333 3334 if (ShouldDeleteCopyConstructor(CD)) { 3335 if (First) { 3336 CD->setDeletedAsWritten(); 3337 } else { 3338 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3339 << CXXCopyConstructor; 3340 CD->setInvalidDecl(); 3341 } 3342 } 3343} 3344 3345void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3346 assert(MD->isExplicitlyDefaulted()); 3347 3348 // Whether this was the first-declared instance of the operator 3349 bool First = MD == MD->getCanonicalDecl(); 3350 3351 bool HadError = false; 3352 if (MD->getNumParams() != 1) { 3353 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3354 << MD->getSourceRange(); 3355 HadError = true; 3356 } 3357 3358 QualType ReturnType = 3359 MD->getType()->getAs<FunctionType>()->getResultType(); 3360 if (!ReturnType->isLValueReferenceType() || 3361 !Context.hasSameType( 3362 Context.getCanonicalType(ReturnType->getPointeeType()), 3363 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3364 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3365 HadError = true; 3366 } 3367 3368 ImplicitExceptionSpecification Spec(Context); 3369 bool Const; 3370 llvm::tie(Spec, Const) = 3371 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3372 3373 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3374 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3375 *ExceptionType = Context.getFunctionType( 3376 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3377 3378 QualType ArgType = OperType->getArgType(0); 3379 if (!ArgType->isLValueReferenceType()) { 3380 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3381 HadError = true; 3382 } else { 3383 if (ArgType->getPointeeType().isVolatileQualified()) { 3384 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3385 HadError = true; 3386 } 3387 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3388 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3389 HadError = true; 3390 } 3391 } 3392 3393 if (OperType->getTypeQuals()) { 3394 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3395 HadError = true; 3396 } 3397 3398 if (OperType->hasExceptionSpec()) { 3399 if (CheckEquivalentExceptionSpec( 3400 PDiag(diag::err_incorrect_defaulted_exception_spec) 3401 << CXXCopyAssignment, 3402 PDiag(), 3403 ExceptionType, SourceLocation(), 3404 OperType, MD->getLocation())) { 3405 HadError = true; 3406 } 3407 } else if (First) { 3408 // We set the declaration to have the computed exception spec here. 3409 // We duplicate the one parameter type. 3410 EPI.RefQualifier = OperType->getRefQualifier(); 3411 EPI.ExtInfo = OperType->getExtInfo(); 3412 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3413 } 3414 3415 if (HadError) { 3416 MD->setInvalidDecl(); 3417 return; 3418 } 3419 3420 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3421 if (First) { 3422 MD->setDeletedAsWritten(); 3423 } else { 3424 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3425 << CXXCopyAssignment; 3426 MD->setInvalidDecl(); 3427 } 3428 } 3429} 3430 3431void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 3432 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 3433 3434 // Whether this was the first-declared instance of the constructor. 3435 bool First = CD == CD->getCanonicalDecl(); 3436 3437 bool HadError = false; 3438 if (CD->getNumParams() != 1) { 3439 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 3440 << CD->getSourceRange(); 3441 HadError = true; 3442 } 3443 3444 ImplicitExceptionSpecification Spec( 3445 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 3446 3447 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3448 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3449 *ExceptionType = Context.getFunctionType( 3450 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3451 3452 // Check for parameter type matching. 3453 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 3454 QualType ArgType = CtorType->getArgType(0); 3455 if (ArgType->getPointeeType().isVolatileQualified()) { 3456 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 3457 HadError = true; 3458 } 3459 if (ArgType->getPointeeType().isConstQualified()) { 3460 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 3461 HadError = true; 3462 } 3463 3464 if (CtorType->hasExceptionSpec()) { 3465 if (CheckEquivalentExceptionSpec( 3466 PDiag(diag::err_incorrect_defaulted_exception_spec) 3467 << CXXMoveConstructor, 3468 PDiag(), 3469 ExceptionType, SourceLocation(), 3470 CtorType, CD->getLocation())) { 3471 HadError = true; 3472 } 3473 } else if (First) { 3474 // We set the declaration to have the computed exception spec here. 3475 // We duplicate the one parameter type. 3476 EPI.ExtInfo = CtorType->getExtInfo(); 3477 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3478 } 3479 3480 if (HadError) { 3481 CD->setInvalidDecl(); 3482 return; 3483 } 3484 3485 if (ShouldDeleteMoveConstructor(CD)) { 3486 if (First) { 3487 CD->setDeletedAsWritten(); 3488 } else { 3489 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3490 << CXXMoveConstructor; 3491 CD->setInvalidDecl(); 3492 } 3493 } 3494} 3495 3496void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 3497 assert(MD->isExplicitlyDefaulted()); 3498 3499 // Whether this was the first-declared instance of the operator 3500 bool First = MD == MD->getCanonicalDecl(); 3501 3502 bool HadError = false; 3503 if (MD->getNumParams() != 1) { 3504 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 3505 << MD->getSourceRange(); 3506 HadError = true; 3507 } 3508 3509 QualType ReturnType = 3510 MD->getType()->getAs<FunctionType>()->getResultType(); 3511 if (!ReturnType->isLValueReferenceType() || 3512 !Context.hasSameType( 3513 Context.getCanonicalType(ReturnType->getPointeeType()), 3514 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3515 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 3516 HadError = true; 3517 } 3518 3519 ImplicitExceptionSpecification Spec( 3520 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 3521 3522 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3523 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3524 *ExceptionType = Context.getFunctionType( 3525 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3526 3527 QualType ArgType = OperType->getArgType(0); 3528 if (!ArgType->isRValueReferenceType()) { 3529 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 3530 HadError = true; 3531 } else { 3532 if (ArgType->getPointeeType().isVolatileQualified()) { 3533 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 3534 HadError = true; 3535 } 3536 if (ArgType->getPointeeType().isConstQualified()) { 3537 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 3538 HadError = true; 3539 } 3540 } 3541 3542 if (OperType->getTypeQuals()) { 3543 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 3544 HadError = true; 3545 } 3546 3547 if (OperType->hasExceptionSpec()) { 3548 if (CheckEquivalentExceptionSpec( 3549 PDiag(diag::err_incorrect_defaulted_exception_spec) 3550 << CXXMoveAssignment, 3551 PDiag(), 3552 ExceptionType, SourceLocation(), 3553 OperType, MD->getLocation())) { 3554 HadError = true; 3555 } 3556 } else if (First) { 3557 // We set the declaration to have the computed exception spec here. 3558 // We duplicate the one parameter type. 3559 EPI.RefQualifier = OperType->getRefQualifier(); 3560 EPI.ExtInfo = OperType->getExtInfo(); 3561 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3562 } 3563 3564 if (HadError) { 3565 MD->setInvalidDecl(); 3566 return; 3567 } 3568 3569 if (ShouldDeleteMoveAssignmentOperator(MD)) { 3570 if (First) { 3571 MD->setDeletedAsWritten(); 3572 } else { 3573 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3574 << CXXMoveAssignment; 3575 MD->setInvalidDecl(); 3576 } 3577 } 3578} 3579 3580void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 3581 assert(DD->isExplicitlyDefaulted()); 3582 3583 // Whether this was the first-declared instance of the destructor. 3584 bool First = DD == DD->getCanonicalDecl(); 3585 3586 ImplicitExceptionSpecification Spec 3587 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 3588 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3589 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 3590 *ExceptionType = Context.getFunctionType( 3591 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3592 3593 if (DtorType->hasExceptionSpec()) { 3594 if (CheckEquivalentExceptionSpec( 3595 PDiag(diag::err_incorrect_defaulted_exception_spec) 3596 << CXXDestructor, 3597 PDiag(), 3598 ExceptionType, SourceLocation(), 3599 DtorType, DD->getLocation())) { 3600 DD->setInvalidDecl(); 3601 return; 3602 } 3603 } else if (First) { 3604 // We set the declaration to have the computed exception spec here. 3605 // There are no parameters. 3606 EPI.ExtInfo = DtorType->getExtInfo(); 3607 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3608 } 3609 3610 if (ShouldDeleteDestructor(DD)) { 3611 if (First) { 3612 DD->setDeletedAsWritten(); 3613 } else { 3614 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 3615 << CXXDestructor; 3616 DD->setInvalidDecl(); 3617 } 3618 } 3619} 3620 3621bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3622 CXXRecordDecl *RD = CD->getParent(); 3623 assert(!RD->isDependentType() && "do deletion after instantiation"); 3624 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3625 return false; 3626 3627 SourceLocation Loc = CD->getLocation(); 3628 3629 // Do access control from the constructor 3630 ContextRAII CtorContext(*this, CD); 3631 3632 bool Union = RD->isUnion(); 3633 bool AllConst = true; 3634 3635 // We do this because we should never actually use an anonymous 3636 // union's constructor. 3637 if (Union && RD->isAnonymousStructOrUnion()) 3638 return false; 3639 3640 // FIXME: We should put some diagnostic logic right into this function. 3641 3642 // C++0x [class.ctor]/5 3643 // A defaulted default constructor for class X is defined as deleted if: 3644 3645 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3646 BE = RD->bases_end(); 3647 BI != BE; ++BI) { 3648 // We'll handle this one later 3649 if (BI->isVirtual()) 3650 continue; 3651 3652 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3653 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3654 3655 // -- any [direct base class] has a type with a destructor that is 3656 // deleted or inaccessible from the defaulted default constructor 3657 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3658 if (BaseDtor->isDeleted()) 3659 return true; 3660 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3661 AR_accessible) 3662 return true; 3663 3664 // -- any [direct base class either] has no default constructor or 3665 // overload resolution as applied to [its] default constructor 3666 // results in an ambiguity or in a function that is deleted or 3667 // inaccessible from the defaulted default constructor 3668 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3669 if (!BaseDefault || BaseDefault->isDeleted()) 3670 return true; 3671 3672 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3673 PDiag()) != AR_accessible) 3674 return true; 3675 } 3676 3677 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3678 BE = RD->vbases_end(); 3679 BI != BE; ++BI) { 3680 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3681 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3682 3683 // -- any [virtual base class] has a type with a destructor that is 3684 // delete or inaccessible from the defaulted default constructor 3685 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3686 if (BaseDtor->isDeleted()) 3687 return true; 3688 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3689 AR_accessible) 3690 return true; 3691 3692 // -- any [virtual base class either] has no default constructor or 3693 // overload resolution as applied to [its] default constructor 3694 // results in an ambiguity or in a function that is deleted or 3695 // inaccessible from the defaulted default constructor 3696 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3697 if (!BaseDefault || BaseDefault->isDeleted()) 3698 return true; 3699 3700 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3701 PDiag()) != AR_accessible) 3702 return true; 3703 } 3704 3705 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3706 FE = RD->field_end(); 3707 FI != FE; ++FI) { 3708 if (FI->isInvalidDecl()) 3709 continue; 3710 3711 QualType FieldType = Context.getBaseElementType(FI->getType()); 3712 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3713 3714 // -- any non-static data member with no brace-or-equal-initializer is of 3715 // reference type 3716 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 3717 return true; 3718 3719 // -- X is a union and all its variant members are of const-qualified type 3720 // (or array thereof) 3721 if (Union && !FieldType.isConstQualified()) 3722 AllConst = false; 3723 3724 if (FieldRecord) { 3725 // -- X is a union-like class that has a variant member with a non-trivial 3726 // default constructor 3727 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3728 return true; 3729 3730 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3731 if (FieldDtor->isDeleted()) 3732 return true; 3733 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3734 AR_accessible) 3735 return true; 3736 3737 // -- any non-variant non-static data member of const-qualified type (or 3738 // array thereof) with no brace-or-equal-initializer does not have a 3739 // user-provided default constructor 3740 if (FieldType.isConstQualified() && 3741 !FI->hasInClassInitializer() && 3742 !FieldRecord->hasUserProvidedDefaultConstructor()) 3743 return true; 3744 3745 if (!Union && FieldRecord->isUnion() && 3746 FieldRecord->isAnonymousStructOrUnion()) { 3747 // We're okay to reuse AllConst here since we only care about the 3748 // value otherwise if we're in a union. 3749 AllConst = true; 3750 3751 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3752 UE = FieldRecord->field_end(); 3753 UI != UE; ++UI) { 3754 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3755 CXXRecordDecl *UnionFieldRecord = 3756 UnionFieldType->getAsCXXRecordDecl(); 3757 3758 if (!UnionFieldType.isConstQualified()) 3759 AllConst = false; 3760 3761 if (UnionFieldRecord && 3762 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3763 return true; 3764 } 3765 3766 if (AllConst) 3767 return true; 3768 3769 // Don't try to initialize the anonymous union 3770 // This is technically non-conformant, but sanity demands it. 3771 continue; 3772 } 3773 3774 // -- any non-static data member with no brace-or-equal-initializer has 3775 // class type M (or array thereof) and either M has no default 3776 // constructor or overload resolution as applied to M's default 3777 // constructor results in an ambiguity or in a function that is deleted 3778 // or inaccessible from the defaulted default constructor. 3779 if (!FI->hasInClassInitializer()) { 3780 CXXConstructorDecl *FieldDefault = LookupDefaultConstructor(FieldRecord); 3781 if (!FieldDefault || FieldDefault->isDeleted()) 3782 return true; 3783 if (CheckConstructorAccess(Loc, FieldDefault, FieldDefault->getAccess(), 3784 PDiag()) != AR_accessible) 3785 return true; 3786 } 3787 } else if (!Union && FieldType.isConstQualified() && 3788 !FI->hasInClassInitializer()) { 3789 // -- any non-variant non-static data member of const-qualified type (or 3790 // array thereof) with no brace-or-equal-initializer does not have a 3791 // user-provided default constructor 3792 return true; 3793 } 3794 } 3795 3796 if (Union && AllConst) 3797 return true; 3798 3799 return false; 3800} 3801 3802bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 3803 CXXRecordDecl *RD = CD->getParent(); 3804 assert(!RD->isDependentType() && "do deletion after instantiation"); 3805 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3806 return false; 3807 3808 SourceLocation Loc = CD->getLocation(); 3809 3810 // Do access control from the constructor 3811 ContextRAII CtorContext(*this, CD); 3812 3813 bool Union = RD->isUnion(); 3814 3815 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 3816 "copy assignment arg has no pointee type"); 3817 unsigned ArgQuals = 3818 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 3819 Qualifiers::Const : 0; 3820 3821 // We do this because we should never actually use an anonymous 3822 // union's constructor. 3823 if (Union && RD->isAnonymousStructOrUnion()) 3824 return false; 3825 3826 // FIXME: We should put some diagnostic logic right into this function. 3827 3828 // C++0x [class.copy]/11 3829 // A defaulted [copy] constructor for class X is defined as delete if X has: 3830 3831 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3832 BE = RD->bases_end(); 3833 BI != BE; ++BI) { 3834 // We'll handle this one later 3835 if (BI->isVirtual()) 3836 continue; 3837 3838 QualType BaseType = BI->getType(); 3839 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3840 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3841 3842 // -- any [direct base class] of a type with a destructor that is deleted or 3843 // inaccessible from the defaulted constructor 3844 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3845 if (BaseDtor->isDeleted()) 3846 return true; 3847 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3848 AR_accessible) 3849 return true; 3850 3851 // -- a [direct base class] B that cannot be [copied] because overload 3852 // resolution, as applied to B's [copy] constructor, results in an 3853 // ambiguity or a function that is deleted or inaccessible from the 3854 // defaulted constructor 3855 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3856 if (!BaseCtor || BaseCtor->isDeleted()) 3857 return true; 3858 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3859 AR_accessible) 3860 return true; 3861 } 3862 3863 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3864 BE = RD->vbases_end(); 3865 BI != BE; ++BI) { 3866 QualType BaseType = BI->getType(); 3867 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3868 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3869 3870 // -- any [virtual base class] of a type with a destructor that is deleted or 3871 // inaccessible from the defaulted constructor 3872 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3873 if (BaseDtor->isDeleted()) 3874 return true; 3875 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3876 AR_accessible) 3877 return true; 3878 3879 // -- a [virtual base class] B that cannot be [copied] because overload 3880 // resolution, as applied to B's [copy] constructor, results in an 3881 // ambiguity or a function that is deleted or inaccessible from the 3882 // defaulted constructor 3883 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3884 if (!BaseCtor || BaseCtor->isDeleted()) 3885 return true; 3886 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3887 AR_accessible) 3888 return true; 3889 } 3890 3891 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3892 FE = RD->field_end(); 3893 FI != FE; ++FI) { 3894 QualType FieldType = Context.getBaseElementType(FI->getType()); 3895 3896 // -- for a copy constructor, a non-static data member of rvalue reference 3897 // type 3898 if (FieldType->isRValueReferenceType()) 3899 return true; 3900 3901 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3902 3903 if (FieldRecord) { 3904 // This is an anonymous union 3905 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3906 // Anonymous unions inside unions do not variant members create 3907 if (!Union) { 3908 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3909 UE = FieldRecord->field_end(); 3910 UI != UE; ++UI) { 3911 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3912 CXXRecordDecl *UnionFieldRecord = 3913 UnionFieldType->getAsCXXRecordDecl(); 3914 3915 // -- a variant member with a non-trivial [copy] constructor and X 3916 // is a union-like class 3917 if (UnionFieldRecord && 3918 !UnionFieldRecord->hasTrivialCopyConstructor()) 3919 return true; 3920 } 3921 } 3922 3923 // Don't try to initalize an anonymous union 3924 continue; 3925 } else { 3926 // -- a variant member with a non-trivial [copy] constructor and X is a 3927 // union-like class 3928 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 3929 return true; 3930 3931 // -- any [non-static data member] of a type with a destructor that is 3932 // deleted or inaccessible from the defaulted constructor 3933 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3934 if (FieldDtor->isDeleted()) 3935 return true; 3936 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3937 AR_accessible) 3938 return true; 3939 } 3940 3941 // -- a [non-static data member of class type (or array thereof)] B that 3942 // cannot be [copied] because overload resolution, as applied to B's 3943 // [copy] constructor, results in an ambiguity or a function that is 3944 // deleted or inaccessible from the defaulted constructor 3945 CXXConstructorDecl *FieldCtor = LookupCopyingConstructor(FieldRecord, 3946 ArgQuals); 3947 if (!FieldCtor || FieldCtor->isDeleted()) 3948 return true; 3949 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 3950 PDiag()) != AR_accessible) 3951 return true; 3952 } 3953 } 3954 3955 return false; 3956} 3957 3958bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 3959 CXXRecordDecl *RD = MD->getParent(); 3960 assert(!RD->isDependentType() && "do deletion after instantiation"); 3961 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3962 return false; 3963 3964 SourceLocation Loc = MD->getLocation(); 3965 3966 // Do access control from the constructor 3967 ContextRAII MethodContext(*this, MD); 3968 3969 bool Union = RD->isUnion(); 3970 3971 unsigned ArgQuals = 3972 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 3973 Qualifiers::Const : 0; 3974 3975 // We do this because we should never actually use an anonymous 3976 // union's constructor. 3977 if (Union && RD->isAnonymousStructOrUnion()) 3978 return false; 3979 3980 // FIXME: We should put some diagnostic logic right into this function. 3981 3982 // C++0x [class.copy]/20 3983 // A defaulted [copy] assignment operator for class X is defined as deleted 3984 // if X has: 3985 3986 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3987 BE = RD->bases_end(); 3988 BI != BE; ++BI) { 3989 // We'll handle this one later 3990 if (BI->isVirtual()) 3991 continue; 3992 3993 QualType BaseType = BI->getType(); 3994 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3995 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3996 3997 // -- a [direct base class] B that cannot be [copied] because overload 3998 // resolution, as applied to B's [copy] assignment operator, results in 3999 // an ambiguity or a function that is deleted or inaccessible from the 4000 // assignment operator 4001 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4002 0); 4003 if (!CopyOper || CopyOper->isDeleted()) 4004 return true; 4005 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4006 return true; 4007 } 4008 4009 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4010 BE = RD->vbases_end(); 4011 BI != BE; ++BI) { 4012 QualType BaseType = BI->getType(); 4013 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4014 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4015 4016 // -- a [virtual base class] B that cannot be [copied] because overload 4017 // resolution, as applied to B's [copy] assignment operator, results in 4018 // an ambiguity or a function that is deleted or inaccessible from the 4019 // assignment operator 4020 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4021 0); 4022 if (!CopyOper || CopyOper->isDeleted()) 4023 return true; 4024 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4025 return true; 4026 } 4027 4028 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4029 FE = RD->field_end(); 4030 FI != FE; ++FI) { 4031 QualType FieldType = Context.getBaseElementType(FI->getType()); 4032 4033 // -- a non-static data member of reference type 4034 if (FieldType->isReferenceType()) 4035 return true; 4036 4037 // -- a non-static data member of const non-class type (or array thereof) 4038 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4039 return true; 4040 4041 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4042 4043 if (FieldRecord) { 4044 // This is an anonymous union 4045 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4046 // Anonymous unions inside unions do not variant members create 4047 if (!Union) { 4048 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4049 UE = FieldRecord->field_end(); 4050 UI != UE; ++UI) { 4051 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4052 CXXRecordDecl *UnionFieldRecord = 4053 UnionFieldType->getAsCXXRecordDecl(); 4054 4055 // -- a variant member with a non-trivial [copy] assignment operator 4056 // and X is a union-like class 4057 if (UnionFieldRecord && 4058 !UnionFieldRecord->hasTrivialCopyAssignment()) 4059 return true; 4060 } 4061 } 4062 4063 // Don't try to initalize an anonymous union 4064 continue; 4065 // -- a variant member with a non-trivial [copy] assignment operator 4066 // and X is a union-like class 4067 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4068 return true; 4069 } 4070 4071 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4072 false, 0); 4073 if (!CopyOper || CopyOper->isDeleted()) 4074 return true; 4075 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4076 return true; 4077 } 4078 } 4079 4080 return false; 4081} 4082 4083bool Sema::ShouldDeleteMoveConstructor(CXXConstructorDecl *CD) { 4084 CXXRecordDecl *RD = CD->getParent(); 4085 assert(!RD->isDependentType() && "do deletion after instantiation"); 4086 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4087 return false; 4088 4089 SourceLocation Loc = CD->getLocation(); 4090 4091 // Do access control from the constructor 4092 ContextRAII CtorContext(*this, CD); 4093 4094 bool Union = RD->isUnion(); 4095 4096 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 4097 "copy assignment arg has no pointee type"); 4098 4099 // We do this because we should never actually use an anonymous 4100 // union's constructor. 4101 if (Union && RD->isAnonymousStructOrUnion()) 4102 return false; 4103 4104 // C++0x [class.copy]/11 4105 // A defaulted [move] constructor for class X is defined as deleted 4106 // if X has: 4107 4108 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4109 BE = RD->bases_end(); 4110 BI != BE; ++BI) { 4111 // We'll handle this one later 4112 if (BI->isVirtual()) 4113 continue; 4114 4115 QualType BaseType = BI->getType(); 4116 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4117 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4118 4119 // -- any [direct base class] of a type with a destructor that is deleted or 4120 // inaccessible from the defaulted constructor 4121 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4122 if (BaseDtor->isDeleted()) 4123 return true; 4124 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4125 AR_accessible) 4126 return true; 4127 4128 // -- a [direct base class] B that cannot be [moved] because overload 4129 // resolution, as applied to B's [move] constructor, results in an 4130 // ambiguity or a function that is deleted or inaccessible from the 4131 // defaulted constructor 4132 CXXConstructorDecl *BaseCtor = LookupMovingConstructor(BaseDecl); 4133 if (!BaseCtor || BaseCtor->isDeleted()) 4134 return true; 4135 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4136 AR_accessible) 4137 return true; 4138 4139 // -- for a move constructor, a [direct base class] with a type that 4140 // does not have a move constructor and is not trivially copyable. 4141 // If the field isn't a record, it's always trivially copyable. 4142 // A moving constructor could be a copy constructor instead. 4143 if (!BaseCtor->isMoveConstructor() && 4144 !BaseDecl->isTriviallyCopyable()) 4145 return true; 4146 } 4147 4148 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4149 BE = RD->vbases_end(); 4150 BI != BE; ++BI) { 4151 QualType BaseType = BI->getType(); 4152 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4153 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4154 4155 // -- any [virtual base class] of a type with a destructor that is deleted 4156 // or inaccessible from the defaulted constructor 4157 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4158 if (BaseDtor->isDeleted()) 4159 return true; 4160 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4161 AR_accessible) 4162 return true; 4163 4164 // -- a [virtual base class] B that cannot be [moved] because overload 4165 // resolution, as applied to B's [move] constructor, results in an 4166 // ambiguity or a function that is deleted or inaccessible from the 4167 // defaulted constructor 4168 CXXConstructorDecl *BaseCtor = LookupMovingConstructor(BaseDecl); 4169 if (!BaseCtor || BaseCtor->isDeleted()) 4170 return true; 4171 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4172 AR_accessible) 4173 return true; 4174 4175 // -- for a move constructor, a [virtual base class] with a type that 4176 // does not have a move constructor and is not trivially copyable. 4177 // If the field isn't a record, it's always trivially copyable. 4178 // A moving constructor could be a copy constructor instead. 4179 if (!BaseCtor->isMoveConstructor() && 4180 !BaseDecl->isTriviallyCopyable()) 4181 return true; 4182 } 4183 4184 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4185 FE = RD->field_end(); 4186 FI != FE; ++FI) { 4187 QualType FieldType = Context.getBaseElementType(FI->getType()); 4188 4189 if (CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl()) { 4190 // This is an anonymous union 4191 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4192 // Anonymous unions inside unions do not variant members create 4193 if (!Union) { 4194 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4195 UE = FieldRecord->field_end(); 4196 UI != UE; ++UI) { 4197 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4198 CXXRecordDecl *UnionFieldRecord = 4199 UnionFieldType->getAsCXXRecordDecl(); 4200 4201 // -- a variant member with a non-trivial [move] constructor and X 4202 // is a union-like class 4203 if (UnionFieldRecord && 4204 !UnionFieldRecord->hasTrivialMoveConstructor()) 4205 return true; 4206 } 4207 } 4208 4209 // Don't try to initalize an anonymous union 4210 continue; 4211 } else { 4212 // -- a variant member with a non-trivial [move] constructor and X is a 4213 // union-like class 4214 if (Union && !FieldRecord->hasTrivialMoveConstructor()) 4215 return true; 4216 4217 // -- any [non-static data member] of a type with a destructor that is 4218 // deleted or inaccessible from the defaulted constructor 4219 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4220 if (FieldDtor->isDeleted()) 4221 return true; 4222 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4223 AR_accessible) 4224 return true; 4225 } 4226 4227 // -- a [non-static data member of class type (or array thereof)] B that 4228 // cannot be [moved] because overload resolution, as applied to B's 4229 // [move] constructor, results in an ambiguity or a function that is 4230 // deleted or inaccessible from the defaulted constructor 4231 CXXConstructorDecl *FieldCtor = LookupMovingConstructor(FieldRecord); 4232 if (!FieldCtor || FieldCtor->isDeleted()) 4233 return true; 4234 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4235 PDiag()) != AR_accessible) 4236 return true; 4237 4238 // -- for a move constructor, a [non-static data member] with a type that 4239 // does not have a move constructor and is not trivially copyable. 4240 // If the field isn't a record, it's always trivially copyable. 4241 // A moving constructor could be a copy constructor instead. 4242 if (!FieldCtor->isMoveConstructor() && 4243 !FieldRecord->isTriviallyCopyable()) 4244 return true; 4245 } 4246 } 4247 4248 return false; 4249} 4250 4251bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4252 CXXRecordDecl *RD = MD->getParent(); 4253 assert(!RD->isDependentType() && "do deletion after instantiation"); 4254 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4255 return false; 4256 4257 SourceLocation Loc = MD->getLocation(); 4258 4259 // Do access control from the constructor 4260 ContextRAII MethodContext(*this, MD); 4261 4262 bool Union = RD->isUnion(); 4263 4264 // We do this because we should never actually use an anonymous 4265 // union's constructor. 4266 if (Union && RD->isAnonymousStructOrUnion()) 4267 return false; 4268 4269 // C++0x [class.copy]/20 4270 // A defaulted [move] assignment operator for class X is defined as deleted 4271 // if X has: 4272 4273 // -- for the move constructor, [...] any direct or indirect virtual base 4274 // class. 4275 if (RD->getNumVBases() != 0) 4276 return true; 4277 4278 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4279 BE = RD->bases_end(); 4280 BI != BE; ++BI) { 4281 4282 QualType BaseType = BI->getType(); 4283 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4284 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4285 4286 // -- a [direct base class] B that cannot be [moved] because overload 4287 // resolution, as applied to B's [move] assignment operator, results in 4288 // an ambiguity or a function that is deleted or inaccessible from the 4289 // assignment operator 4290 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4291 if (!MoveOper || MoveOper->isDeleted()) 4292 return true; 4293 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4294 return true; 4295 4296 // -- for the move assignment operator, a [direct base class] with a type 4297 // that does not have a move assignment operator and is not trivially 4298 // copyable. 4299 if (!MoveOper->isMoveAssignmentOperator() && 4300 !BaseDecl->isTriviallyCopyable()) 4301 return true; 4302 } 4303 4304 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4305 FE = RD->field_end(); 4306 FI != FE; ++FI) { 4307 QualType FieldType = Context.getBaseElementType(FI->getType()); 4308 4309 // -- a non-static data member of reference type 4310 if (FieldType->isReferenceType()) 4311 return true; 4312 4313 // -- a non-static data member of const non-class type (or array thereof) 4314 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4315 return true; 4316 4317 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4318 4319 if (FieldRecord) { 4320 // This is an anonymous union 4321 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4322 // Anonymous unions inside unions do not variant members create 4323 if (!Union) { 4324 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4325 UE = FieldRecord->field_end(); 4326 UI != UE; ++UI) { 4327 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4328 CXXRecordDecl *UnionFieldRecord = 4329 UnionFieldType->getAsCXXRecordDecl(); 4330 4331 // -- a variant member with a non-trivial [move] assignment operator 4332 // and X is a union-like class 4333 if (UnionFieldRecord && 4334 !UnionFieldRecord->hasTrivialMoveAssignment()) 4335 return true; 4336 } 4337 } 4338 4339 // Don't try to initalize an anonymous union 4340 continue; 4341 // -- a variant member with a non-trivial [move] assignment operator 4342 // and X is a union-like class 4343 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4344 return true; 4345 } 4346 4347 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, 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 [non-static data member] with a 4354 // type that does not have a move assignment operator and is not 4355 // trivially copyable. 4356 if (!MoveOper->isMoveAssignmentOperator() && 4357 !FieldRecord->isTriviallyCopyable()) 4358 return true; 4359 } 4360 } 4361 4362 return false; 4363} 4364 4365bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4366 CXXRecordDecl *RD = DD->getParent(); 4367 assert(!RD->isDependentType() && "do deletion after instantiation"); 4368 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4369 return false; 4370 4371 SourceLocation Loc = DD->getLocation(); 4372 4373 // Do access control from the destructor 4374 ContextRAII CtorContext(*this, DD); 4375 4376 bool Union = RD->isUnion(); 4377 4378 // We do this because we should never actually use an anonymous 4379 // union's destructor. 4380 if (Union && RD->isAnonymousStructOrUnion()) 4381 return false; 4382 4383 // C++0x [class.dtor]p5 4384 // A defaulted destructor for a class X is defined as deleted if: 4385 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4386 BE = RD->bases_end(); 4387 BI != BE; ++BI) { 4388 // We'll handle this one later 4389 if (BI->isVirtual()) 4390 continue; 4391 4392 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4393 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4394 assert(BaseDtor && "base has no destructor"); 4395 4396 // -- any direct or virtual base class has a deleted destructor or 4397 // a destructor that is inaccessible from the defaulted destructor 4398 if (BaseDtor->isDeleted()) 4399 return true; 4400 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4401 AR_accessible) 4402 return true; 4403 } 4404 4405 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4406 BE = RD->vbases_end(); 4407 BI != BE; ++BI) { 4408 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4409 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4410 assert(BaseDtor && "base has no destructor"); 4411 4412 // -- any direct or virtual base class has a deleted destructor or 4413 // a destructor that is inaccessible from the defaulted destructor 4414 if (BaseDtor->isDeleted()) 4415 return true; 4416 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4417 AR_accessible) 4418 return true; 4419 } 4420 4421 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4422 FE = RD->field_end(); 4423 FI != FE; ++FI) { 4424 QualType FieldType = Context.getBaseElementType(FI->getType()); 4425 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4426 if (FieldRecord) { 4427 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4428 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4429 UE = FieldRecord->field_end(); 4430 UI != UE; ++UI) { 4431 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4432 CXXRecordDecl *UnionFieldRecord = 4433 UnionFieldType->getAsCXXRecordDecl(); 4434 4435 // -- X is a union-like class that has a variant member with a non- 4436 // trivial destructor. 4437 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4438 return true; 4439 } 4440 // Technically we are supposed to do this next check unconditionally. 4441 // But that makes absolutely no sense. 4442 } else { 4443 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4444 4445 // -- any of the non-static data members has class type M (or array 4446 // thereof) and M has a deleted destructor or a destructor that is 4447 // inaccessible from the defaulted destructor 4448 if (FieldDtor->isDeleted()) 4449 return true; 4450 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4451 AR_accessible) 4452 return true; 4453 4454 // -- X is a union-like class that has a variant member with a non- 4455 // trivial destructor. 4456 if (Union && !FieldDtor->isTrivial()) 4457 return true; 4458 } 4459 } 4460 } 4461 4462 if (DD->isVirtual()) { 4463 FunctionDecl *OperatorDelete = 0; 4464 DeclarationName Name = 4465 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4466 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4467 false)) 4468 return true; 4469 } 4470 4471 4472 return false; 4473} 4474 4475/// \brief Data used with FindHiddenVirtualMethod 4476namespace { 4477 struct FindHiddenVirtualMethodData { 4478 Sema *S; 4479 CXXMethodDecl *Method; 4480 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4481 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4482 }; 4483} 4484 4485/// \brief Member lookup function that determines whether a given C++ 4486/// method overloads virtual methods in a base class without overriding any, 4487/// to be used with CXXRecordDecl::lookupInBases(). 4488static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4489 CXXBasePath &Path, 4490 void *UserData) { 4491 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4492 4493 FindHiddenVirtualMethodData &Data 4494 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4495 4496 DeclarationName Name = Data.Method->getDeclName(); 4497 assert(Name.getNameKind() == DeclarationName::Identifier); 4498 4499 bool foundSameNameMethod = false; 4500 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4501 for (Path.Decls = BaseRecord->lookup(Name); 4502 Path.Decls.first != Path.Decls.second; 4503 ++Path.Decls.first) { 4504 NamedDecl *D = *Path.Decls.first; 4505 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4506 MD = MD->getCanonicalDecl(); 4507 foundSameNameMethod = true; 4508 // Interested only in hidden virtual methods. 4509 if (!MD->isVirtual()) 4510 continue; 4511 // If the method we are checking overrides a method from its base 4512 // don't warn about the other overloaded methods. 4513 if (!Data.S->IsOverload(Data.Method, MD, false)) 4514 return true; 4515 // Collect the overload only if its hidden. 4516 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4517 overloadedMethods.push_back(MD); 4518 } 4519 } 4520 4521 if (foundSameNameMethod) 4522 Data.OverloadedMethods.append(overloadedMethods.begin(), 4523 overloadedMethods.end()); 4524 return foundSameNameMethod; 4525} 4526 4527/// \brief See if a method overloads virtual methods in a base class without 4528/// overriding any. 4529void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4530 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4531 MD->getLocation()) == Diagnostic::Ignored) 4532 return; 4533 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4534 return; 4535 4536 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4537 /*bool RecordPaths=*/false, 4538 /*bool DetectVirtual=*/false); 4539 FindHiddenVirtualMethodData Data; 4540 Data.Method = MD; 4541 Data.S = this; 4542 4543 // Keep the base methods that were overriden or introduced in the subclass 4544 // by 'using' in a set. A base method not in this set is hidden. 4545 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4546 res.first != res.second; ++res.first) { 4547 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4548 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4549 E = MD->end_overridden_methods(); 4550 I != E; ++I) 4551 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4552 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4553 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4554 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4555 } 4556 4557 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4558 !Data.OverloadedMethods.empty()) { 4559 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4560 << MD << (Data.OverloadedMethods.size() > 1); 4561 4562 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4563 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4564 Diag(overloadedMD->getLocation(), 4565 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4566 } 4567 } 4568} 4569 4570void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4571 Decl *TagDecl, 4572 SourceLocation LBrac, 4573 SourceLocation RBrac, 4574 AttributeList *AttrList) { 4575 if (!TagDecl) 4576 return; 4577 4578 AdjustDeclIfTemplate(TagDecl); 4579 4580 ActOnFields(S, RLoc, TagDecl, 4581 // strict aliasing violation! 4582 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4583 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 4584 4585 CheckCompletedCXXClass( 4586 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4587} 4588 4589/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4590/// special functions, such as the default constructor, copy 4591/// constructor, or destructor, to the given C++ class (C++ 4592/// [special]p1). This routine can only be executed just before the 4593/// definition of the class is complete. 4594void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4595 if (!ClassDecl->hasUserDeclaredConstructor()) 4596 ++ASTContext::NumImplicitDefaultConstructors; 4597 4598 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4599 ++ASTContext::NumImplicitCopyConstructors; 4600 4601 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4602 ++ASTContext::NumImplicitCopyAssignmentOperators; 4603 4604 // If we have a dynamic class, then the copy assignment operator may be 4605 // virtual, so we have to declare it immediately. This ensures that, e.g., 4606 // it shows up in the right place in the vtable and that we diagnose 4607 // problems with the implicit exception specification. 4608 if (ClassDecl->isDynamicClass()) 4609 DeclareImplicitCopyAssignment(ClassDecl); 4610 } 4611 4612 if (!ClassDecl->hasUserDeclaredDestructor()) { 4613 ++ASTContext::NumImplicitDestructors; 4614 4615 // If we have a dynamic class, then the destructor may be virtual, so we 4616 // have to declare the destructor immediately. This ensures that, e.g., it 4617 // shows up in the right place in the vtable and that we diagnose problems 4618 // with the implicit exception specification. 4619 if (ClassDecl->isDynamicClass()) 4620 DeclareImplicitDestructor(ClassDecl); 4621 } 4622} 4623 4624void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4625 if (!D) 4626 return; 4627 4628 int NumParamList = D->getNumTemplateParameterLists(); 4629 for (int i = 0; i < NumParamList; i++) { 4630 TemplateParameterList* Params = D->getTemplateParameterList(i); 4631 for (TemplateParameterList::iterator Param = Params->begin(), 4632 ParamEnd = Params->end(); 4633 Param != ParamEnd; ++Param) { 4634 NamedDecl *Named = cast<NamedDecl>(*Param); 4635 if (Named->getDeclName()) { 4636 S->AddDecl(Named); 4637 IdResolver.AddDecl(Named); 4638 } 4639 } 4640 } 4641} 4642 4643void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4644 if (!D) 4645 return; 4646 4647 TemplateParameterList *Params = 0; 4648 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4649 Params = Template->getTemplateParameters(); 4650 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4651 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4652 Params = PartialSpec->getTemplateParameters(); 4653 else 4654 return; 4655 4656 for (TemplateParameterList::iterator Param = Params->begin(), 4657 ParamEnd = Params->end(); 4658 Param != ParamEnd; ++Param) { 4659 NamedDecl *Named = cast<NamedDecl>(*Param); 4660 if (Named->getDeclName()) { 4661 S->AddDecl(Named); 4662 IdResolver.AddDecl(Named); 4663 } 4664 } 4665} 4666 4667void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4668 if (!RecordD) return; 4669 AdjustDeclIfTemplate(RecordD); 4670 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4671 PushDeclContext(S, Record); 4672} 4673 4674void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4675 if (!RecordD) return; 4676 PopDeclContext(); 4677} 4678 4679/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4680/// parsing a top-level (non-nested) C++ class, and we are now 4681/// parsing those parts of the given Method declaration that could 4682/// not be parsed earlier (C++ [class.mem]p2), such as default 4683/// arguments. This action should enter the scope of the given 4684/// Method declaration as if we had just parsed the qualified method 4685/// name. However, it should not bring the parameters into scope; 4686/// that will be performed by ActOnDelayedCXXMethodParameter. 4687void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4688} 4689 4690/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4691/// C++ method declaration. We're (re-)introducing the given 4692/// function parameter into scope for use in parsing later parts of 4693/// the method declaration. For example, we could see an 4694/// ActOnParamDefaultArgument event for this parameter. 4695void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4696 if (!ParamD) 4697 return; 4698 4699 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4700 4701 // If this parameter has an unparsed default argument, clear it out 4702 // to make way for the parsed default argument. 4703 if (Param->hasUnparsedDefaultArg()) 4704 Param->setDefaultArg(0); 4705 4706 S->AddDecl(Param); 4707 if (Param->getDeclName()) 4708 IdResolver.AddDecl(Param); 4709} 4710 4711/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4712/// processing the delayed method declaration for Method. The method 4713/// declaration is now considered finished. There may be a separate 4714/// ActOnStartOfFunctionDef action later (not necessarily 4715/// immediately!) for this method, if it was also defined inside the 4716/// class body. 4717void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4718 if (!MethodD) 4719 return; 4720 4721 AdjustDeclIfTemplate(MethodD); 4722 4723 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4724 4725 // Now that we have our default arguments, check the constructor 4726 // again. It could produce additional diagnostics or affect whether 4727 // the class has implicitly-declared destructors, among other 4728 // things. 4729 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4730 CheckConstructor(Constructor); 4731 4732 // Check the default arguments, which we may have added. 4733 if (!Method->isInvalidDecl()) 4734 CheckCXXDefaultArguments(Method); 4735} 4736 4737/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4738/// the well-formedness of the constructor declarator @p D with type @p 4739/// R. If there are any errors in the declarator, this routine will 4740/// emit diagnostics and set the invalid bit to true. In any case, the type 4741/// will be updated to reflect a well-formed type for the constructor and 4742/// returned. 4743QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4744 StorageClass &SC) { 4745 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4746 4747 // C++ [class.ctor]p3: 4748 // A constructor shall not be virtual (10.3) or static (9.4). A 4749 // constructor can be invoked for a const, volatile or const 4750 // volatile object. A constructor shall not be declared const, 4751 // volatile, or const volatile (9.3.2). 4752 if (isVirtual) { 4753 if (!D.isInvalidType()) 4754 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4755 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4756 << SourceRange(D.getIdentifierLoc()); 4757 D.setInvalidType(); 4758 } 4759 if (SC == SC_Static) { 4760 if (!D.isInvalidType()) 4761 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4762 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4763 << SourceRange(D.getIdentifierLoc()); 4764 D.setInvalidType(); 4765 SC = SC_None; 4766 } 4767 4768 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4769 if (FTI.TypeQuals != 0) { 4770 if (FTI.TypeQuals & Qualifiers::Const) 4771 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4772 << "const" << SourceRange(D.getIdentifierLoc()); 4773 if (FTI.TypeQuals & Qualifiers::Volatile) 4774 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4775 << "volatile" << SourceRange(D.getIdentifierLoc()); 4776 if (FTI.TypeQuals & Qualifiers::Restrict) 4777 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4778 << "restrict" << SourceRange(D.getIdentifierLoc()); 4779 D.setInvalidType(); 4780 } 4781 4782 // C++0x [class.ctor]p4: 4783 // A constructor shall not be declared with a ref-qualifier. 4784 if (FTI.hasRefQualifier()) { 4785 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4786 << FTI.RefQualifierIsLValueRef 4787 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4788 D.setInvalidType(); 4789 } 4790 4791 // Rebuild the function type "R" without any type qualifiers (in 4792 // case any of the errors above fired) and with "void" as the 4793 // return type, since constructors don't have return types. 4794 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4795 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4796 return R; 4797 4798 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4799 EPI.TypeQuals = 0; 4800 EPI.RefQualifier = RQ_None; 4801 4802 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4803 Proto->getNumArgs(), EPI); 4804} 4805 4806/// CheckConstructor - Checks a fully-formed constructor for 4807/// well-formedness, issuing any diagnostics required. Returns true if 4808/// the constructor declarator is invalid. 4809void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4810 CXXRecordDecl *ClassDecl 4811 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4812 if (!ClassDecl) 4813 return Constructor->setInvalidDecl(); 4814 4815 // C++ [class.copy]p3: 4816 // A declaration of a constructor for a class X is ill-formed if 4817 // its first parameter is of type (optionally cv-qualified) X and 4818 // either there are no other parameters or else all other 4819 // parameters have default arguments. 4820 if (!Constructor->isInvalidDecl() && 4821 ((Constructor->getNumParams() == 1) || 4822 (Constructor->getNumParams() > 1 && 4823 Constructor->getParamDecl(1)->hasDefaultArg())) && 4824 Constructor->getTemplateSpecializationKind() 4825 != TSK_ImplicitInstantiation) { 4826 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4827 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4828 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4829 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4830 const char *ConstRef 4831 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4832 : " const &"; 4833 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4834 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4835 4836 // FIXME: Rather that making the constructor invalid, we should endeavor 4837 // to fix the type. 4838 Constructor->setInvalidDecl(); 4839 } 4840 } 4841} 4842 4843/// CheckDestructor - Checks a fully-formed destructor definition for 4844/// well-formedness, issuing any diagnostics required. Returns true 4845/// on error. 4846bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4847 CXXRecordDecl *RD = Destructor->getParent(); 4848 4849 if (Destructor->isVirtual()) { 4850 SourceLocation Loc; 4851 4852 if (!Destructor->isImplicit()) 4853 Loc = Destructor->getLocation(); 4854 else 4855 Loc = RD->getLocation(); 4856 4857 // If we have a virtual destructor, look up the deallocation function 4858 FunctionDecl *OperatorDelete = 0; 4859 DeclarationName Name = 4860 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4861 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4862 return true; 4863 4864 MarkDeclarationReferenced(Loc, OperatorDelete); 4865 4866 Destructor->setOperatorDelete(OperatorDelete); 4867 } 4868 4869 return false; 4870} 4871 4872static inline bool 4873FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4874 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4875 FTI.ArgInfo[0].Param && 4876 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4877} 4878 4879/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4880/// the well-formednes of the destructor declarator @p D with type @p 4881/// R. If there are any errors in the declarator, this routine will 4882/// emit diagnostics and set the declarator to invalid. Even if this happens, 4883/// will be updated to reflect a well-formed type for the destructor and 4884/// returned. 4885QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4886 StorageClass& SC) { 4887 // C++ [class.dtor]p1: 4888 // [...] A typedef-name that names a class is a class-name 4889 // (7.1.3); however, a typedef-name that names a class shall not 4890 // be used as the identifier in the declarator for a destructor 4891 // declaration. 4892 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 4893 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 4894 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4895 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 4896 else if (const TemplateSpecializationType *TST = 4897 DeclaratorType->getAs<TemplateSpecializationType>()) 4898 if (TST->isTypeAlias()) 4899 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4900 << DeclaratorType << 1; 4901 4902 // C++ [class.dtor]p2: 4903 // A destructor is used to destroy objects of its class type. A 4904 // destructor takes no parameters, and no return type can be 4905 // specified for it (not even void). The address of a destructor 4906 // shall not be taken. A destructor shall not be static. A 4907 // destructor can be invoked for a const, volatile or const 4908 // volatile object. A destructor shall not be declared const, 4909 // volatile or const volatile (9.3.2). 4910 if (SC == SC_Static) { 4911 if (!D.isInvalidType()) 4912 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 4913 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4914 << SourceRange(D.getIdentifierLoc()) 4915 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4916 4917 SC = SC_None; 4918 } 4919 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4920 // Destructors don't have return types, but the parser will 4921 // happily parse something like: 4922 // 4923 // class X { 4924 // float ~X(); 4925 // }; 4926 // 4927 // The return type will be eliminated later. 4928 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 4929 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4930 << SourceRange(D.getIdentifierLoc()); 4931 } 4932 4933 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4934 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 4935 if (FTI.TypeQuals & Qualifiers::Const) 4936 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4937 << "const" << SourceRange(D.getIdentifierLoc()); 4938 if (FTI.TypeQuals & Qualifiers::Volatile) 4939 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4940 << "volatile" << SourceRange(D.getIdentifierLoc()); 4941 if (FTI.TypeQuals & Qualifiers::Restrict) 4942 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4943 << "restrict" << SourceRange(D.getIdentifierLoc()); 4944 D.setInvalidType(); 4945 } 4946 4947 // C++0x [class.dtor]p2: 4948 // A destructor shall not be declared with a ref-qualifier. 4949 if (FTI.hasRefQualifier()) { 4950 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 4951 << FTI.RefQualifierIsLValueRef 4952 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4953 D.setInvalidType(); 4954 } 4955 4956 // Make sure we don't have any parameters. 4957 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 4958 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 4959 4960 // Delete the parameters. 4961 FTI.freeArgs(); 4962 D.setInvalidType(); 4963 } 4964 4965 // Make sure the destructor isn't variadic. 4966 if (FTI.isVariadic) { 4967 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 4968 D.setInvalidType(); 4969 } 4970 4971 // Rebuild the function type "R" without any type qualifiers or 4972 // parameters (in case any of the errors above fired) and with 4973 // "void" as the return type, since destructors don't have return 4974 // types. 4975 if (!D.isInvalidType()) 4976 return R; 4977 4978 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4979 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4980 EPI.Variadic = false; 4981 EPI.TypeQuals = 0; 4982 EPI.RefQualifier = RQ_None; 4983 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4984} 4985 4986/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 4987/// well-formednes of the conversion function declarator @p D with 4988/// type @p R. If there are any errors in the declarator, this routine 4989/// will emit diagnostics and return true. Otherwise, it will return 4990/// false. Either way, the type @p R will be updated to reflect a 4991/// well-formed type for the conversion operator. 4992void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 4993 StorageClass& SC) { 4994 // C++ [class.conv.fct]p1: 4995 // Neither parameter types nor return type can be specified. The 4996 // type of a conversion function (8.3.5) is "function taking no 4997 // parameter returning conversion-type-id." 4998 if (SC == SC_Static) { 4999 if (!D.isInvalidType()) 5000 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5001 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5002 << SourceRange(D.getIdentifierLoc()); 5003 D.setInvalidType(); 5004 SC = SC_None; 5005 } 5006 5007 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5008 5009 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5010 // Conversion functions don't have return types, but the parser will 5011 // happily parse something like: 5012 // 5013 // class X { 5014 // float operator bool(); 5015 // }; 5016 // 5017 // The return type will be changed later anyway. 5018 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5019 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5020 << SourceRange(D.getIdentifierLoc()); 5021 D.setInvalidType(); 5022 } 5023 5024 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5025 5026 // Make sure we don't have any parameters. 5027 if (Proto->getNumArgs() > 0) { 5028 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5029 5030 // Delete the parameters. 5031 D.getFunctionTypeInfo().freeArgs(); 5032 D.setInvalidType(); 5033 } else if (Proto->isVariadic()) { 5034 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5035 D.setInvalidType(); 5036 } 5037 5038 // Diagnose "&operator bool()" and other such nonsense. This 5039 // is actually a gcc extension which we don't support. 5040 if (Proto->getResultType() != ConvType) { 5041 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5042 << Proto->getResultType(); 5043 D.setInvalidType(); 5044 ConvType = Proto->getResultType(); 5045 } 5046 5047 // C++ [class.conv.fct]p4: 5048 // The conversion-type-id shall not represent a function type nor 5049 // an array type. 5050 if (ConvType->isArrayType()) { 5051 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5052 ConvType = Context.getPointerType(ConvType); 5053 D.setInvalidType(); 5054 } else if (ConvType->isFunctionType()) { 5055 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5056 ConvType = Context.getPointerType(ConvType); 5057 D.setInvalidType(); 5058 } 5059 5060 // Rebuild the function type "R" without any parameters (in case any 5061 // of the errors above fired) and with the conversion type as the 5062 // return type. 5063 if (D.isInvalidType()) 5064 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5065 5066 // C++0x explicit conversion operators. 5067 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 5068 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5069 diag::warn_explicit_conversion_functions) 5070 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5071} 5072 5073/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5074/// the declaration of the given C++ conversion function. This routine 5075/// is responsible for recording the conversion function in the C++ 5076/// class, if possible. 5077Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5078 assert(Conversion && "Expected to receive a conversion function declaration"); 5079 5080 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5081 5082 // Make sure we aren't redeclaring the conversion function. 5083 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5084 5085 // C++ [class.conv.fct]p1: 5086 // [...] A conversion function is never used to convert a 5087 // (possibly cv-qualified) object to the (possibly cv-qualified) 5088 // same object type (or a reference to it), to a (possibly 5089 // cv-qualified) base class of that type (or a reference to it), 5090 // or to (possibly cv-qualified) void. 5091 // FIXME: Suppress this warning if the conversion function ends up being a 5092 // virtual function that overrides a virtual function in a base class. 5093 QualType ClassType 5094 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5095 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5096 ConvType = ConvTypeRef->getPointeeType(); 5097 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5098 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5099 /* Suppress diagnostics for instantiations. */; 5100 else if (ConvType->isRecordType()) { 5101 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5102 if (ConvType == ClassType) 5103 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5104 << ClassType; 5105 else if (IsDerivedFrom(ClassType, ConvType)) 5106 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5107 << ClassType << ConvType; 5108 } else if (ConvType->isVoidType()) { 5109 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5110 << ClassType << ConvType; 5111 } 5112 5113 if (FunctionTemplateDecl *ConversionTemplate 5114 = Conversion->getDescribedFunctionTemplate()) 5115 return ConversionTemplate; 5116 5117 return Conversion; 5118} 5119 5120//===----------------------------------------------------------------------===// 5121// Namespace Handling 5122//===----------------------------------------------------------------------===// 5123 5124 5125 5126/// ActOnStartNamespaceDef - This is called at the start of a namespace 5127/// definition. 5128Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5129 SourceLocation InlineLoc, 5130 SourceLocation NamespaceLoc, 5131 SourceLocation IdentLoc, 5132 IdentifierInfo *II, 5133 SourceLocation LBrace, 5134 AttributeList *AttrList) { 5135 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5136 // For anonymous namespace, take the location of the left brace. 5137 SourceLocation Loc = II ? IdentLoc : LBrace; 5138 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 5139 StartLoc, Loc, II); 5140 Namespc->setInline(InlineLoc.isValid()); 5141 5142 Scope *DeclRegionScope = NamespcScope->getParent(); 5143 5144 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5145 5146 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5147 PushNamespaceVisibilityAttr(Attr); 5148 5149 if (II) { 5150 // C++ [namespace.def]p2: 5151 // The identifier in an original-namespace-definition shall not 5152 // have been previously defined in the declarative region in 5153 // which the original-namespace-definition appears. The 5154 // identifier in an original-namespace-definition is the name of 5155 // the namespace. Subsequently in that declarative region, it is 5156 // treated as an original-namespace-name. 5157 // 5158 // Since namespace names are unique in their scope, and we don't 5159 // look through using directives, just look for any ordinary names. 5160 5161 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5162 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5163 Decl::IDNS_Namespace; 5164 NamedDecl *PrevDecl = 0; 5165 for (DeclContext::lookup_result R 5166 = CurContext->getRedeclContext()->lookup(II); 5167 R.first != R.second; ++R.first) { 5168 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5169 PrevDecl = *R.first; 5170 break; 5171 } 5172 } 5173 5174 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 5175 // This is an extended namespace definition. 5176 if (Namespc->isInline() != OrigNS->isInline()) { 5177 // inline-ness must match 5178 if (OrigNS->isInline()) { 5179 // The user probably just forgot the 'inline', so suggest that it 5180 // be added back. 5181 Diag(Namespc->getLocation(), 5182 diag::warn_inline_namespace_reopened_noninline) 5183 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5184 } else { 5185 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5186 << Namespc->isInline(); 5187 } 5188 Diag(OrigNS->getLocation(), diag::note_previous_definition); 5189 5190 // Recover by ignoring the new namespace's inline status. 5191 Namespc->setInline(OrigNS->isInline()); 5192 } 5193 5194 // Attach this namespace decl to the chain of extended namespace 5195 // definitions. 5196 OrigNS->setNextNamespace(Namespc); 5197 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 5198 5199 // Remove the previous declaration from the scope. 5200 if (DeclRegionScope->isDeclScope(OrigNS)) { 5201 IdResolver.RemoveDecl(OrigNS); 5202 DeclRegionScope->RemoveDecl(OrigNS); 5203 } 5204 } else if (PrevDecl) { 5205 // This is an invalid name redefinition. 5206 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 5207 << Namespc->getDeclName(); 5208 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5209 Namespc->setInvalidDecl(); 5210 // Continue on to push Namespc as current DeclContext and return it. 5211 } else if (II->isStr("std") && 5212 CurContext->getRedeclContext()->isTranslationUnit()) { 5213 // This is the first "real" definition of the namespace "std", so update 5214 // our cache of the "std" namespace to point at this definition. 5215 if (NamespaceDecl *StdNS = getStdNamespace()) { 5216 // We had already defined a dummy namespace "std". Link this new 5217 // namespace definition to the dummy namespace "std". 5218 StdNS->setNextNamespace(Namespc); 5219 StdNS->setLocation(IdentLoc); 5220 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 5221 } 5222 5223 // Make our StdNamespace cache point at the first real definition of the 5224 // "std" namespace. 5225 StdNamespace = Namespc; 5226 5227 // Add this instance of "std" to the set of known namespaces 5228 KnownNamespaces[Namespc] = false; 5229 } else if (!Namespc->isInline()) { 5230 // Since this is an "original" namespace, add it to the known set of 5231 // namespaces if it is not an inline namespace. 5232 KnownNamespaces[Namespc] = false; 5233 } 5234 5235 PushOnScopeChains(Namespc, DeclRegionScope); 5236 } else { 5237 // Anonymous namespaces. 5238 assert(Namespc->isAnonymousNamespace()); 5239 5240 // Link the anonymous namespace into its parent. 5241 NamespaceDecl *PrevDecl; 5242 DeclContext *Parent = CurContext->getRedeclContext(); 5243 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5244 PrevDecl = TU->getAnonymousNamespace(); 5245 TU->setAnonymousNamespace(Namespc); 5246 } else { 5247 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5248 PrevDecl = ND->getAnonymousNamespace(); 5249 ND->setAnonymousNamespace(Namespc); 5250 } 5251 5252 // Link the anonymous namespace with its previous declaration. 5253 if (PrevDecl) { 5254 assert(PrevDecl->isAnonymousNamespace()); 5255 assert(!PrevDecl->getNextNamespace()); 5256 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 5257 PrevDecl->setNextNamespace(Namespc); 5258 5259 if (Namespc->isInline() != PrevDecl->isInline()) { 5260 // inline-ness must match 5261 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5262 << Namespc->isInline(); 5263 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5264 Namespc->setInvalidDecl(); 5265 // Recover by ignoring the new namespace's inline status. 5266 Namespc->setInline(PrevDecl->isInline()); 5267 } 5268 } 5269 5270 CurContext->addDecl(Namespc); 5271 5272 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5273 // behaves as if it were replaced by 5274 // namespace unique { /* empty body */ } 5275 // using namespace unique; 5276 // namespace unique { namespace-body } 5277 // where all occurrences of 'unique' in a translation unit are 5278 // replaced by the same identifier and this identifier differs 5279 // from all other identifiers in the entire program. 5280 5281 // We just create the namespace with an empty name and then add an 5282 // implicit using declaration, just like the standard suggests. 5283 // 5284 // CodeGen enforces the "universally unique" aspect by giving all 5285 // declarations semantically contained within an anonymous 5286 // namespace internal linkage. 5287 5288 if (!PrevDecl) { 5289 UsingDirectiveDecl* UD 5290 = UsingDirectiveDecl::Create(Context, CurContext, 5291 /* 'using' */ LBrace, 5292 /* 'namespace' */ SourceLocation(), 5293 /* qualifier */ NestedNameSpecifierLoc(), 5294 /* identifier */ SourceLocation(), 5295 Namespc, 5296 /* Ancestor */ CurContext); 5297 UD->setImplicit(); 5298 CurContext->addDecl(UD); 5299 } 5300 } 5301 5302 // Although we could have an invalid decl (i.e. the namespace name is a 5303 // redefinition), push it as current DeclContext and try to continue parsing. 5304 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5305 // for the namespace has the declarations that showed up in that particular 5306 // namespace definition. 5307 PushDeclContext(NamespcScope, Namespc); 5308 return Namespc; 5309} 5310 5311/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5312/// is a namespace alias, returns the namespace it points to. 5313static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5314 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5315 return AD->getNamespace(); 5316 return dyn_cast_or_null<NamespaceDecl>(D); 5317} 5318 5319/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5320/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5321void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5322 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5323 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5324 Namespc->setRBraceLoc(RBrace); 5325 PopDeclContext(); 5326 if (Namespc->hasAttr<VisibilityAttr>()) 5327 PopPragmaVisibility(); 5328} 5329 5330CXXRecordDecl *Sema::getStdBadAlloc() const { 5331 return cast_or_null<CXXRecordDecl>( 5332 StdBadAlloc.get(Context.getExternalSource())); 5333} 5334 5335NamespaceDecl *Sema::getStdNamespace() const { 5336 return cast_or_null<NamespaceDecl>( 5337 StdNamespace.get(Context.getExternalSource())); 5338} 5339 5340/// \brief Retrieve the special "std" namespace, which may require us to 5341/// implicitly define the namespace. 5342NamespaceDecl *Sema::getOrCreateStdNamespace() { 5343 if (!StdNamespace) { 5344 // The "std" namespace has not yet been defined, so build one implicitly. 5345 StdNamespace = NamespaceDecl::Create(Context, 5346 Context.getTranslationUnitDecl(), 5347 SourceLocation(), SourceLocation(), 5348 &PP.getIdentifierTable().get("std")); 5349 getStdNamespace()->setImplicit(true); 5350 } 5351 5352 return getStdNamespace(); 5353} 5354 5355/// \brief Determine whether a using statement is in a context where it will be 5356/// apply in all contexts. 5357static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5358 switch (CurContext->getDeclKind()) { 5359 case Decl::TranslationUnit: 5360 return true; 5361 case Decl::LinkageSpec: 5362 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5363 default: 5364 return false; 5365 } 5366} 5367 5368static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5369 CXXScopeSpec &SS, 5370 SourceLocation IdentLoc, 5371 IdentifierInfo *Ident) { 5372 R.clear(); 5373 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5374 R.getLookupKind(), Sc, &SS, NULL, 5375 false, S.CTC_NoKeywords, NULL)) { 5376 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 5377 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 5378 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5379 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5380 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5381 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5382 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5383 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5384 else 5385 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5386 << Ident << CorrectedQuotedStr 5387 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5388 5389 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5390 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5391 5392 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5393 R.addDecl(Corrected.getCorrectionDecl()); 5394 return true; 5395 } 5396 R.setLookupName(Ident); 5397 } 5398 return false; 5399} 5400 5401Decl *Sema::ActOnUsingDirective(Scope *S, 5402 SourceLocation UsingLoc, 5403 SourceLocation NamespcLoc, 5404 CXXScopeSpec &SS, 5405 SourceLocation IdentLoc, 5406 IdentifierInfo *NamespcName, 5407 AttributeList *AttrList) { 5408 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5409 assert(NamespcName && "Invalid NamespcName."); 5410 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5411 5412 // This can only happen along a recovery path. 5413 while (S->getFlags() & Scope::TemplateParamScope) 5414 S = S->getParent(); 5415 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5416 5417 UsingDirectiveDecl *UDir = 0; 5418 NestedNameSpecifier *Qualifier = 0; 5419 if (SS.isSet()) 5420 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5421 5422 // Lookup namespace name. 5423 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5424 LookupParsedName(R, S, &SS); 5425 if (R.isAmbiguous()) 5426 return 0; 5427 5428 if (R.empty()) { 5429 R.clear(); 5430 // Allow "using namespace std;" or "using namespace ::std;" even if 5431 // "std" hasn't been defined yet, for GCC compatibility. 5432 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5433 NamespcName->isStr("std")) { 5434 Diag(IdentLoc, diag::ext_using_undefined_std); 5435 R.addDecl(getOrCreateStdNamespace()); 5436 R.resolveKind(); 5437 } 5438 // Otherwise, attempt typo correction. 5439 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5440 } 5441 5442 if (!R.empty()) { 5443 NamedDecl *Named = R.getFoundDecl(); 5444 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5445 && "expected namespace decl"); 5446 // C++ [namespace.udir]p1: 5447 // A using-directive specifies that the names in the nominated 5448 // namespace can be used in the scope in which the 5449 // using-directive appears after the using-directive. During 5450 // unqualified name lookup (3.4.1), the names appear as if they 5451 // were declared in the nearest enclosing namespace which 5452 // contains both the using-directive and the nominated 5453 // namespace. [Note: in this context, "contains" means "contains 5454 // directly or indirectly". ] 5455 5456 // Find enclosing context containing both using-directive and 5457 // nominated namespace. 5458 NamespaceDecl *NS = getNamespaceDecl(Named); 5459 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5460 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5461 CommonAncestor = CommonAncestor->getParent(); 5462 5463 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5464 SS.getWithLocInContext(Context), 5465 IdentLoc, Named, CommonAncestor); 5466 5467 if (IsUsingDirectiveInToplevelContext(CurContext) && 5468 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5469 Diag(IdentLoc, diag::warn_using_directive_in_header); 5470 } 5471 5472 PushUsingDirective(S, UDir); 5473 } else { 5474 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5475 } 5476 5477 // FIXME: We ignore attributes for now. 5478 return UDir; 5479} 5480 5481void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5482 // If scope has associated entity, then using directive is at namespace 5483 // or translation unit scope. We add UsingDirectiveDecls, into 5484 // it's lookup structure. 5485 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5486 Ctx->addDecl(UDir); 5487 else 5488 // Otherwise it is block-sope. using-directives will affect lookup 5489 // only to the end of scope. 5490 S->PushUsingDirective(UDir); 5491} 5492 5493 5494Decl *Sema::ActOnUsingDeclaration(Scope *S, 5495 AccessSpecifier AS, 5496 bool HasUsingKeyword, 5497 SourceLocation UsingLoc, 5498 CXXScopeSpec &SS, 5499 UnqualifiedId &Name, 5500 AttributeList *AttrList, 5501 bool IsTypeName, 5502 SourceLocation TypenameLoc) { 5503 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5504 5505 switch (Name.getKind()) { 5506 case UnqualifiedId::IK_ImplicitSelfParam: 5507 case UnqualifiedId::IK_Identifier: 5508 case UnqualifiedId::IK_OperatorFunctionId: 5509 case UnqualifiedId::IK_LiteralOperatorId: 5510 case UnqualifiedId::IK_ConversionFunctionId: 5511 break; 5512 5513 case UnqualifiedId::IK_ConstructorName: 5514 case UnqualifiedId::IK_ConstructorTemplateId: 5515 // C++0x inherited constructors. 5516 if (getLangOptions().CPlusPlus0x) break; 5517 5518 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 5519 << SS.getRange(); 5520 return 0; 5521 5522 case UnqualifiedId::IK_DestructorName: 5523 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5524 << SS.getRange(); 5525 return 0; 5526 5527 case UnqualifiedId::IK_TemplateId: 5528 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5529 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5530 return 0; 5531 } 5532 5533 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5534 DeclarationName TargetName = TargetNameInfo.getName(); 5535 if (!TargetName) 5536 return 0; 5537 5538 // Warn about using declarations. 5539 // TODO: store that the declaration was written without 'using' and 5540 // talk about access decls instead of using decls in the 5541 // diagnostics. 5542 if (!HasUsingKeyword) { 5543 UsingLoc = Name.getSourceRange().getBegin(); 5544 5545 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5546 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5547 } 5548 5549 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5550 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5551 return 0; 5552 5553 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5554 TargetNameInfo, AttrList, 5555 /* IsInstantiation */ false, 5556 IsTypeName, TypenameLoc); 5557 if (UD) 5558 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5559 5560 return UD; 5561} 5562 5563/// \brief Determine whether a using declaration considers the given 5564/// declarations as "equivalent", e.g., if they are redeclarations of 5565/// the same entity or are both typedefs of the same type. 5566static bool 5567IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5568 bool &SuppressRedeclaration) { 5569 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5570 SuppressRedeclaration = false; 5571 return true; 5572 } 5573 5574 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5575 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5576 SuppressRedeclaration = true; 5577 return Context.hasSameType(TD1->getUnderlyingType(), 5578 TD2->getUnderlyingType()); 5579 } 5580 5581 return false; 5582} 5583 5584 5585/// Determines whether to create a using shadow decl for a particular 5586/// decl, given the set of decls existing prior to this using lookup. 5587bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5588 const LookupResult &Previous) { 5589 // Diagnose finding a decl which is not from a base class of the 5590 // current class. We do this now because there are cases where this 5591 // function will silently decide not to build a shadow decl, which 5592 // will pre-empt further diagnostics. 5593 // 5594 // We don't need to do this in C++0x because we do the check once on 5595 // the qualifier. 5596 // 5597 // FIXME: diagnose the following if we care enough: 5598 // struct A { int foo; }; 5599 // struct B : A { using A::foo; }; 5600 // template <class T> struct C : A {}; 5601 // template <class T> struct D : C<T> { using B::foo; } // <--- 5602 // This is invalid (during instantiation) in C++03 because B::foo 5603 // resolves to the using decl in B, which is not a base class of D<T>. 5604 // We can't diagnose it immediately because C<T> is an unknown 5605 // specialization. The UsingShadowDecl in D<T> then points directly 5606 // to A::foo, which will look well-formed when we instantiate. 5607 // The right solution is to not collapse the shadow-decl chain. 5608 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5609 DeclContext *OrigDC = Orig->getDeclContext(); 5610 5611 // Handle enums and anonymous structs. 5612 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5613 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5614 while (OrigRec->isAnonymousStructOrUnion()) 5615 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5616 5617 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5618 if (OrigDC == CurContext) { 5619 Diag(Using->getLocation(), 5620 diag::err_using_decl_nested_name_specifier_is_current_class) 5621 << Using->getQualifierLoc().getSourceRange(); 5622 Diag(Orig->getLocation(), diag::note_using_decl_target); 5623 return true; 5624 } 5625 5626 Diag(Using->getQualifierLoc().getBeginLoc(), 5627 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5628 << Using->getQualifier() 5629 << cast<CXXRecordDecl>(CurContext) 5630 << Using->getQualifierLoc().getSourceRange(); 5631 Diag(Orig->getLocation(), diag::note_using_decl_target); 5632 return true; 5633 } 5634 } 5635 5636 if (Previous.empty()) return false; 5637 5638 NamedDecl *Target = Orig; 5639 if (isa<UsingShadowDecl>(Target)) 5640 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5641 5642 // If the target happens to be one of the previous declarations, we 5643 // don't have a conflict. 5644 // 5645 // FIXME: but we might be increasing its access, in which case we 5646 // should redeclare it. 5647 NamedDecl *NonTag = 0, *Tag = 0; 5648 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5649 I != E; ++I) { 5650 NamedDecl *D = (*I)->getUnderlyingDecl(); 5651 bool Result; 5652 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5653 return Result; 5654 5655 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5656 } 5657 5658 if (Target->isFunctionOrFunctionTemplate()) { 5659 FunctionDecl *FD; 5660 if (isa<FunctionTemplateDecl>(Target)) 5661 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5662 else 5663 FD = cast<FunctionDecl>(Target); 5664 5665 NamedDecl *OldDecl = 0; 5666 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5667 case Ovl_Overload: 5668 return false; 5669 5670 case Ovl_NonFunction: 5671 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5672 break; 5673 5674 // We found a decl with the exact signature. 5675 case Ovl_Match: 5676 // If we're in a record, we want to hide the target, so we 5677 // return true (without a diagnostic) to tell the caller not to 5678 // build a shadow decl. 5679 if (CurContext->isRecord()) 5680 return true; 5681 5682 // If we're not in a record, this is an error. 5683 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5684 break; 5685 } 5686 5687 Diag(Target->getLocation(), diag::note_using_decl_target); 5688 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5689 return true; 5690 } 5691 5692 // Target is not a function. 5693 5694 if (isa<TagDecl>(Target)) { 5695 // No conflict between a tag and a non-tag. 5696 if (!Tag) return false; 5697 5698 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5699 Diag(Target->getLocation(), diag::note_using_decl_target); 5700 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5701 return true; 5702 } 5703 5704 // No conflict between a tag and a non-tag. 5705 if (!NonTag) return false; 5706 5707 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5708 Diag(Target->getLocation(), diag::note_using_decl_target); 5709 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5710 return true; 5711} 5712 5713/// Builds a shadow declaration corresponding to a 'using' declaration. 5714UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5715 UsingDecl *UD, 5716 NamedDecl *Orig) { 5717 5718 // If we resolved to another shadow declaration, just coalesce them. 5719 NamedDecl *Target = Orig; 5720 if (isa<UsingShadowDecl>(Target)) { 5721 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5722 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5723 } 5724 5725 UsingShadowDecl *Shadow 5726 = UsingShadowDecl::Create(Context, CurContext, 5727 UD->getLocation(), UD, Target); 5728 UD->addShadowDecl(Shadow); 5729 5730 Shadow->setAccess(UD->getAccess()); 5731 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5732 Shadow->setInvalidDecl(); 5733 5734 if (S) 5735 PushOnScopeChains(Shadow, S); 5736 else 5737 CurContext->addDecl(Shadow); 5738 5739 5740 return Shadow; 5741} 5742 5743/// Hides a using shadow declaration. This is required by the current 5744/// using-decl implementation when a resolvable using declaration in a 5745/// class is followed by a declaration which would hide or override 5746/// one or more of the using decl's targets; for example: 5747/// 5748/// struct Base { void foo(int); }; 5749/// struct Derived : Base { 5750/// using Base::foo; 5751/// void foo(int); 5752/// }; 5753/// 5754/// The governing language is C++03 [namespace.udecl]p12: 5755/// 5756/// When a using-declaration brings names from a base class into a 5757/// derived class scope, member functions in the derived class 5758/// override and/or hide member functions with the same name and 5759/// parameter types in a base class (rather than conflicting). 5760/// 5761/// There are two ways to implement this: 5762/// (1) optimistically create shadow decls when they're not hidden 5763/// by existing declarations, or 5764/// (2) don't create any shadow decls (or at least don't make them 5765/// visible) until we've fully parsed/instantiated the class. 5766/// The problem with (1) is that we might have to retroactively remove 5767/// a shadow decl, which requires several O(n) operations because the 5768/// decl structures are (very reasonably) not designed for removal. 5769/// (2) avoids this but is very fiddly and phase-dependent. 5770void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 5771 if (Shadow->getDeclName().getNameKind() == 5772 DeclarationName::CXXConversionFunctionName) 5773 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 5774 5775 // Remove it from the DeclContext... 5776 Shadow->getDeclContext()->removeDecl(Shadow); 5777 5778 // ...and the scope, if applicable... 5779 if (S) { 5780 S->RemoveDecl(Shadow); 5781 IdResolver.RemoveDecl(Shadow); 5782 } 5783 5784 // ...and the using decl. 5785 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 5786 5787 // TODO: complain somehow if Shadow was used. It shouldn't 5788 // be possible for this to happen, because...? 5789} 5790 5791/// Builds a using declaration. 5792/// 5793/// \param IsInstantiation - Whether this call arises from an 5794/// instantiation of an unresolved using declaration. We treat 5795/// the lookup differently for these declarations. 5796NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 5797 SourceLocation UsingLoc, 5798 CXXScopeSpec &SS, 5799 const DeclarationNameInfo &NameInfo, 5800 AttributeList *AttrList, 5801 bool IsInstantiation, 5802 bool IsTypeName, 5803 SourceLocation TypenameLoc) { 5804 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5805 SourceLocation IdentLoc = NameInfo.getLoc(); 5806 assert(IdentLoc.isValid() && "Invalid TargetName location."); 5807 5808 // FIXME: We ignore attributes for now. 5809 5810 if (SS.isEmpty()) { 5811 Diag(IdentLoc, diag::err_using_requires_qualname); 5812 return 0; 5813 } 5814 5815 // Do the redeclaration lookup in the current scope. 5816 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 5817 ForRedeclaration); 5818 Previous.setHideTags(false); 5819 if (S) { 5820 LookupName(Previous, S); 5821 5822 // It is really dumb that we have to do this. 5823 LookupResult::Filter F = Previous.makeFilter(); 5824 while (F.hasNext()) { 5825 NamedDecl *D = F.next(); 5826 if (!isDeclInScope(D, CurContext, S)) 5827 F.erase(); 5828 } 5829 F.done(); 5830 } else { 5831 assert(IsInstantiation && "no scope in non-instantiation"); 5832 assert(CurContext->isRecord() && "scope not record in instantiation"); 5833 LookupQualifiedName(Previous, CurContext); 5834 } 5835 5836 // Check for invalid redeclarations. 5837 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 5838 return 0; 5839 5840 // Check for bad qualifiers. 5841 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 5842 return 0; 5843 5844 DeclContext *LookupContext = computeDeclContext(SS); 5845 NamedDecl *D; 5846 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 5847 if (!LookupContext) { 5848 if (IsTypeName) { 5849 // FIXME: not all declaration name kinds are legal here 5850 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 5851 UsingLoc, TypenameLoc, 5852 QualifierLoc, 5853 IdentLoc, NameInfo.getName()); 5854 } else { 5855 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 5856 QualifierLoc, NameInfo); 5857 } 5858 } else { 5859 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 5860 NameInfo, IsTypeName); 5861 } 5862 D->setAccess(AS); 5863 CurContext->addDecl(D); 5864 5865 if (!LookupContext) return D; 5866 UsingDecl *UD = cast<UsingDecl>(D); 5867 5868 if (RequireCompleteDeclContext(SS, LookupContext)) { 5869 UD->setInvalidDecl(); 5870 return UD; 5871 } 5872 5873 // Constructor inheriting using decls get special treatment. 5874 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 5875 if (CheckInheritedConstructorUsingDecl(UD)) 5876 UD->setInvalidDecl(); 5877 return UD; 5878 } 5879 5880 // Otherwise, look up the target name. 5881 5882 LookupResult R(*this, NameInfo, LookupOrdinaryName); 5883 R.setUsingDeclaration(true); 5884 5885 // Unlike most lookups, we don't always want to hide tag 5886 // declarations: tag names are visible through the using declaration 5887 // even if hidden by ordinary names, *except* in a dependent context 5888 // where it's important for the sanity of two-phase lookup. 5889 if (!IsInstantiation) 5890 R.setHideTags(false); 5891 5892 LookupQualifiedName(R, LookupContext); 5893 5894 if (R.empty()) { 5895 Diag(IdentLoc, diag::err_no_member) 5896 << NameInfo.getName() << LookupContext << SS.getRange(); 5897 UD->setInvalidDecl(); 5898 return UD; 5899 } 5900 5901 if (R.isAmbiguous()) { 5902 UD->setInvalidDecl(); 5903 return UD; 5904 } 5905 5906 if (IsTypeName) { 5907 // If we asked for a typename and got a non-type decl, error out. 5908 if (!R.getAsSingle<TypeDecl>()) { 5909 Diag(IdentLoc, diag::err_using_typename_non_type); 5910 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 5911 Diag((*I)->getUnderlyingDecl()->getLocation(), 5912 diag::note_using_decl_target); 5913 UD->setInvalidDecl(); 5914 return UD; 5915 } 5916 } else { 5917 // If we asked for a non-typename and we got a type, error out, 5918 // but only if this is an instantiation of an unresolved using 5919 // decl. Otherwise just silently find the type name. 5920 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 5921 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 5922 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 5923 UD->setInvalidDecl(); 5924 return UD; 5925 } 5926 } 5927 5928 // C++0x N2914 [namespace.udecl]p6: 5929 // A using-declaration shall not name a namespace. 5930 if (R.getAsSingle<NamespaceDecl>()) { 5931 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 5932 << SS.getRange(); 5933 UD->setInvalidDecl(); 5934 return UD; 5935 } 5936 5937 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 5938 if (!CheckUsingShadowDecl(UD, *I, Previous)) 5939 BuildUsingShadowDecl(S, UD, *I); 5940 } 5941 5942 return UD; 5943} 5944 5945/// Additional checks for a using declaration referring to a constructor name. 5946bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 5947 if (UD->isTypeName()) { 5948 // FIXME: Cannot specify typename when specifying constructor 5949 return true; 5950 } 5951 5952 const Type *SourceType = UD->getQualifier()->getAsType(); 5953 assert(SourceType && 5954 "Using decl naming constructor doesn't have type in scope spec."); 5955 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 5956 5957 // Check whether the named type is a direct base class. 5958 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 5959 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 5960 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 5961 BaseIt != BaseE; ++BaseIt) { 5962 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 5963 if (CanonicalSourceType == BaseType) 5964 break; 5965 } 5966 5967 if (BaseIt == BaseE) { 5968 // Did not find SourceType in the bases. 5969 Diag(UD->getUsingLocation(), 5970 diag::err_using_decl_constructor_not_in_direct_base) 5971 << UD->getNameInfo().getSourceRange() 5972 << QualType(SourceType, 0) << TargetClass; 5973 return true; 5974 } 5975 5976 BaseIt->setInheritConstructors(); 5977 5978 return false; 5979} 5980 5981/// Checks that the given using declaration is not an invalid 5982/// redeclaration. Note that this is checking only for the using decl 5983/// itself, not for any ill-formedness among the UsingShadowDecls. 5984bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 5985 bool isTypeName, 5986 const CXXScopeSpec &SS, 5987 SourceLocation NameLoc, 5988 const LookupResult &Prev) { 5989 // C++03 [namespace.udecl]p8: 5990 // C++0x [namespace.udecl]p10: 5991 // A using-declaration is a declaration and can therefore be used 5992 // repeatedly where (and only where) multiple declarations are 5993 // allowed. 5994 // 5995 // That's in non-member contexts. 5996 if (!CurContext->getRedeclContext()->isRecord()) 5997 return false; 5998 5999 NestedNameSpecifier *Qual 6000 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6001 6002 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6003 NamedDecl *D = *I; 6004 6005 bool DTypename; 6006 NestedNameSpecifier *DQual; 6007 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6008 DTypename = UD->isTypeName(); 6009 DQual = UD->getQualifier(); 6010 } else if (UnresolvedUsingValueDecl *UD 6011 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6012 DTypename = false; 6013 DQual = UD->getQualifier(); 6014 } else if (UnresolvedUsingTypenameDecl *UD 6015 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6016 DTypename = true; 6017 DQual = UD->getQualifier(); 6018 } else continue; 6019 6020 // using decls differ if one says 'typename' and the other doesn't. 6021 // FIXME: non-dependent using decls? 6022 if (isTypeName != DTypename) continue; 6023 6024 // using decls differ if they name different scopes (but note that 6025 // template instantiation can cause this check to trigger when it 6026 // didn't before instantiation). 6027 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6028 Context.getCanonicalNestedNameSpecifier(DQual)) 6029 continue; 6030 6031 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6032 Diag(D->getLocation(), diag::note_using_decl) << 1; 6033 return true; 6034 } 6035 6036 return false; 6037} 6038 6039 6040/// Checks that the given nested-name qualifier used in a using decl 6041/// in the current context is appropriately related to the current 6042/// scope. If an error is found, diagnoses it and returns true. 6043bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6044 const CXXScopeSpec &SS, 6045 SourceLocation NameLoc) { 6046 DeclContext *NamedContext = computeDeclContext(SS); 6047 6048 if (!CurContext->isRecord()) { 6049 // C++03 [namespace.udecl]p3: 6050 // C++0x [namespace.udecl]p8: 6051 // A using-declaration for a class member shall be a member-declaration. 6052 6053 // If we weren't able to compute a valid scope, it must be a 6054 // dependent class scope. 6055 if (!NamedContext || NamedContext->isRecord()) { 6056 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6057 << SS.getRange(); 6058 return true; 6059 } 6060 6061 // Otherwise, everything is known to be fine. 6062 return false; 6063 } 6064 6065 // The current scope is a record. 6066 6067 // If the named context is dependent, we can't decide much. 6068 if (!NamedContext) { 6069 // FIXME: in C++0x, we can diagnose if we can prove that the 6070 // nested-name-specifier does not refer to a base class, which is 6071 // still possible in some cases. 6072 6073 // Otherwise we have to conservatively report that things might be 6074 // okay. 6075 return false; 6076 } 6077 6078 if (!NamedContext->isRecord()) { 6079 // Ideally this would point at the last name in the specifier, 6080 // but we don't have that level of source info. 6081 Diag(SS.getRange().getBegin(), 6082 diag::err_using_decl_nested_name_specifier_is_not_class) 6083 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6084 return true; 6085 } 6086 6087 if (!NamedContext->isDependentContext() && 6088 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6089 return true; 6090 6091 if (getLangOptions().CPlusPlus0x) { 6092 // C++0x [namespace.udecl]p3: 6093 // In a using-declaration used as a member-declaration, the 6094 // nested-name-specifier shall name a base class of the class 6095 // being defined. 6096 6097 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6098 cast<CXXRecordDecl>(NamedContext))) { 6099 if (CurContext == NamedContext) { 6100 Diag(NameLoc, 6101 diag::err_using_decl_nested_name_specifier_is_current_class) 6102 << SS.getRange(); 6103 return true; 6104 } 6105 6106 Diag(SS.getRange().getBegin(), 6107 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6108 << (NestedNameSpecifier*) SS.getScopeRep() 6109 << cast<CXXRecordDecl>(CurContext) 6110 << SS.getRange(); 6111 return true; 6112 } 6113 6114 return false; 6115 } 6116 6117 // C++03 [namespace.udecl]p4: 6118 // A using-declaration used as a member-declaration shall refer 6119 // to a member of a base class of the class being defined [etc.]. 6120 6121 // Salient point: SS doesn't have to name a base class as long as 6122 // lookup only finds members from base classes. Therefore we can 6123 // diagnose here only if we can prove that that can't happen, 6124 // i.e. if the class hierarchies provably don't intersect. 6125 6126 // TODO: it would be nice if "definitely valid" results were cached 6127 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6128 // need to be repeated. 6129 6130 struct UserData { 6131 llvm::DenseSet<const CXXRecordDecl*> Bases; 6132 6133 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6134 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6135 Data->Bases.insert(Base); 6136 return true; 6137 } 6138 6139 bool hasDependentBases(const CXXRecordDecl *Class) { 6140 return !Class->forallBases(collect, this); 6141 } 6142 6143 /// Returns true if the base is dependent or is one of the 6144 /// accumulated base classes. 6145 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6146 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6147 return !Data->Bases.count(Base); 6148 } 6149 6150 bool mightShareBases(const CXXRecordDecl *Class) { 6151 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6152 } 6153 }; 6154 6155 UserData Data; 6156 6157 // Returns false if we find a dependent base. 6158 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6159 return false; 6160 6161 // Returns false if the class has a dependent base or if it or one 6162 // of its bases is present in the base set of the current context. 6163 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6164 return false; 6165 6166 Diag(SS.getRange().getBegin(), 6167 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6168 << (NestedNameSpecifier*) SS.getScopeRep() 6169 << cast<CXXRecordDecl>(CurContext) 6170 << SS.getRange(); 6171 6172 return true; 6173} 6174 6175Decl *Sema::ActOnAliasDeclaration(Scope *S, 6176 AccessSpecifier AS, 6177 MultiTemplateParamsArg TemplateParamLists, 6178 SourceLocation UsingLoc, 6179 UnqualifiedId &Name, 6180 TypeResult Type) { 6181 // Skip up to the relevant declaration scope. 6182 while (S->getFlags() & Scope::TemplateParamScope) 6183 S = S->getParent(); 6184 assert((S->getFlags() & Scope::DeclScope) && 6185 "got alias-declaration outside of declaration scope"); 6186 6187 if (Type.isInvalid()) 6188 return 0; 6189 6190 bool Invalid = false; 6191 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6192 TypeSourceInfo *TInfo = 0; 6193 GetTypeFromParser(Type.get(), &TInfo); 6194 6195 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6196 return 0; 6197 6198 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6199 UPPC_DeclarationType)) { 6200 Invalid = true; 6201 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6202 TInfo->getTypeLoc().getBeginLoc()); 6203 } 6204 6205 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6206 LookupName(Previous, S); 6207 6208 // Warn about shadowing the name of a template parameter. 6209 if (Previous.isSingleResult() && 6210 Previous.getFoundDecl()->isTemplateParameter()) { 6211 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 6212 Previous.getFoundDecl())) 6213 Invalid = true; 6214 Previous.clear(); 6215 } 6216 6217 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6218 "name in alias declaration must be an identifier"); 6219 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6220 Name.StartLocation, 6221 Name.Identifier, TInfo); 6222 6223 NewTD->setAccess(AS); 6224 6225 if (Invalid) 6226 NewTD->setInvalidDecl(); 6227 6228 CheckTypedefForVariablyModifiedType(S, NewTD); 6229 Invalid |= NewTD->isInvalidDecl(); 6230 6231 bool Redeclaration = false; 6232 6233 NamedDecl *NewND; 6234 if (TemplateParamLists.size()) { 6235 TypeAliasTemplateDecl *OldDecl = 0; 6236 TemplateParameterList *OldTemplateParams = 0; 6237 6238 if (TemplateParamLists.size() != 1) { 6239 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6240 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6241 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6242 } 6243 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6244 6245 // Only consider previous declarations in the same scope. 6246 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6247 /*ExplicitInstantiationOrSpecialization*/false); 6248 if (!Previous.empty()) { 6249 Redeclaration = true; 6250 6251 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6252 if (!OldDecl && !Invalid) { 6253 Diag(UsingLoc, diag::err_redefinition_different_kind) 6254 << Name.Identifier; 6255 6256 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6257 if (OldD->getLocation().isValid()) 6258 Diag(OldD->getLocation(), diag::note_previous_definition); 6259 6260 Invalid = true; 6261 } 6262 6263 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6264 if (TemplateParameterListsAreEqual(TemplateParams, 6265 OldDecl->getTemplateParameters(), 6266 /*Complain=*/true, 6267 TPL_TemplateMatch)) 6268 OldTemplateParams = OldDecl->getTemplateParameters(); 6269 else 6270 Invalid = true; 6271 6272 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6273 if (!Invalid && 6274 !Context.hasSameType(OldTD->getUnderlyingType(), 6275 NewTD->getUnderlyingType())) { 6276 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6277 // but we can't reasonably accept it. 6278 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6279 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6280 if (OldTD->getLocation().isValid()) 6281 Diag(OldTD->getLocation(), diag::note_previous_definition); 6282 Invalid = true; 6283 } 6284 } 6285 } 6286 6287 // Merge any previous default template arguments into our parameters, 6288 // and check the parameter list. 6289 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6290 TPC_TypeAliasTemplate)) 6291 return 0; 6292 6293 TypeAliasTemplateDecl *NewDecl = 6294 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6295 Name.Identifier, TemplateParams, 6296 NewTD); 6297 6298 NewDecl->setAccess(AS); 6299 6300 if (Invalid) 6301 NewDecl->setInvalidDecl(); 6302 else if (OldDecl) 6303 NewDecl->setPreviousDeclaration(OldDecl); 6304 6305 NewND = NewDecl; 6306 } else { 6307 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6308 NewND = NewTD; 6309 } 6310 6311 if (!Redeclaration) 6312 PushOnScopeChains(NewND, S); 6313 6314 return NewND; 6315} 6316 6317Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6318 SourceLocation NamespaceLoc, 6319 SourceLocation AliasLoc, 6320 IdentifierInfo *Alias, 6321 CXXScopeSpec &SS, 6322 SourceLocation IdentLoc, 6323 IdentifierInfo *Ident) { 6324 6325 // Lookup the namespace name. 6326 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6327 LookupParsedName(R, S, &SS); 6328 6329 // Check if we have a previous declaration with the same name. 6330 NamedDecl *PrevDecl 6331 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6332 ForRedeclaration); 6333 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6334 PrevDecl = 0; 6335 6336 if (PrevDecl) { 6337 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6338 // We already have an alias with the same name that points to the same 6339 // namespace, so don't create a new one. 6340 // FIXME: At some point, we'll want to create the (redundant) 6341 // declaration to maintain better source information. 6342 if (!R.isAmbiguous() && !R.empty() && 6343 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6344 return 0; 6345 } 6346 6347 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6348 diag::err_redefinition_different_kind; 6349 Diag(AliasLoc, DiagID) << Alias; 6350 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6351 return 0; 6352 } 6353 6354 if (R.isAmbiguous()) 6355 return 0; 6356 6357 if (R.empty()) { 6358 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6359 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6360 return 0; 6361 } 6362 } 6363 6364 NamespaceAliasDecl *AliasDecl = 6365 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6366 Alias, SS.getWithLocInContext(Context), 6367 IdentLoc, R.getFoundDecl()); 6368 6369 PushOnScopeChains(AliasDecl, S); 6370 return AliasDecl; 6371} 6372 6373namespace { 6374 /// \brief Scoped object used to handle the state changes required in Sema 6375 /// to implicitly define the body of a C++ member function; 6376 class ImplicitlyDefinedFunctionScope { 6377 Sema &S; 6378 Sema::ContextRAII SavedContext; 6379 6380 public: 6381 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6382 : S(S), SavedContext(S, Method) 6383 { 6384 S.PushFunctionScope(); 6385 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6386 } 6387 6388 ~ImplicitlyDefinedFunctionScope() { 6389 S.PopExpressionEvaluationContext(); 6390 S.PopFunctionOrBlockScope(); 6391 } 6392 }; 6393} 6394 6395Sema::ImplicitExceptionSpecification 6396Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6397 // C++ [except.spec]p14: 6398 // An implicitly declared special member function (Clause 12) shall have an 6399 // exception-specification. [...] 6400 ImplicitExceptionSpecification ExceptSpec(Context); 6401 if (ClassDecl->isInvalidDecl()) 6402 return ExceptSpec; 6403 6404 // Direct base-class constructors. 6405 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6406 BEnd = ClassDecl->bases_end(); 6407 B != BEnd; ++B) { 6408 if (B->isVirtual()) // Handled below. 6409 continue; 6410 6411 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6412 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6413 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6414 // If this is a deleted function, add it anyway. This might be conformant 6415 // with the standard. This might not. I'm not sure. It might not matter. 6416 if (Constructor) 6417 ExceptSpec.CalledDecl(Constructor); 6418 } 6419 } 6420 6421 // Virtual base-class constructors. 6422 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6423 BEnd = ClassDecl->vbases_end(); 6424 B != BEnd; ++B) { 6425 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6426 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6427 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6428 // If this is a deleted function, add it anyway. This might be conformant 6429 // with the standard. This might not. I'm not sure. It might not matter. 6430 if (Constructor) 6431 ExceptSpec.CalledDecl(Constructor); 6432 } 6433 } 6434 6435 // Field constructors. 6436 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6437 FEnd = ClassDecl->field_end(); 6438 F != FEnd; ++F) { 6439 if (F->hasInClassInitializer()) { 6440 if (Expr *E = F->getInClassInitializer()) 6441 ExceptSpec.CalledExpr(E); 6442 else if (!F->isInvalidDecl()) 6443 ExceptSpec.SetDelayed(); 6444 } else if (const RecordType *RecordTy 6445 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6446 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6447 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6448 // If this is a deleted function, add it anyway. This might be conformant 6449 // with the standard. This might not. I'm not sure. It might not matter. 6450 // In particular, the problem is that this function never gets called. It 6451 // might just be ill-formed because this function attempts to refer to 6452 // a deleted function here. 6453 if (Constructor) 6454 ExceptSpec.CalledDecl(Constructor); 6455 } 6456 } 6457 6458 return ExceptSpec; 6459} 6460 6461CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6462 CXXRecordDecl *ClassDecl) { 6463 // C++ [class.ctor]p5: 6464 // A default constructor for a class X is a constructor of class X 6465 // that can be called without an argument. If there is no 6466 // user-declared constructor for class X, a default constructor is 6467 // implicitly declared. An implicitly-declared default constructor 6468 // is an inline public member of its class. 6469 assert(!ClassDecl->hasUserDeclaredConstructor() && 6470 "Should not build implicit default constructor!"); 6471 6472 ImplicitExceptionSpecification Spec = 6473 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6474 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6475 6476 // Create the actual constructor declaration. 6477 CanQualType ClassType 6478 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6479 SourceLocation ClassLoc = ClassDecl->getLocation(); 6480 DeclarationName Name 6481 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6482 DeclarationNameInfo NameInfo(Name, ClassLoc); 6483 CXXConstructorDecl *DefaultCon 6484 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6485 Context.getFunctionType(Context.VoidTy, 6486 0, 0, EPI), 6487 /*TInfo=*/0, 6488 /*isExplicit=*/false, 6489 /*isInline=*/true, 6490 /*isImplicitlyDeclared=*/true, 6491 // FIXME: apply the rules for definitions here 6492 /*isConstexpr=*/false); 6493 DefaultCon->setAccess(AS_public); 6494 DefaultCon->setDefaulted(); 6495 DefaultCon->setImplicit(); 6496 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6497 6498 // Note that we have declared this constructor. 6499 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6500 6501 if (Scope *S = getScopeForContext(ClassDecl)) 6502 PushOnScopeChains(DefaultCon, S, false); 6503 ClassDecl->addDecl(DefaultCon); 6504 6505 if (ShouldDeleteDefaultConstructor(DefaultCon)) 6506 DefaultCon->setDeletedAsWritten(); 6507 6508 return DefaultCon; 6509} 6510 6511void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6512 CXXConstructorDecl *Constructor) { 6513 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6514 !Constructor->doesThisDeclarationHaveABody() && 6515 !Constructor->isDeleted()) && 6516 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6517 6518 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6519 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6520 6521 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6522 DiagnosticErrorTrap Trap(Diags); 6523 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6524 Trap.hasErrorOccurred()) { 6525 Diag(CurrentLocation, diag::note_member_synthesized_at) 6526 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6527 Constructor->setInvalidDecl(); 6528 return; 6529 } 6530 6531 SourceLocation Loc = Constructor->getLocation(); 6532 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6533 6534 Constructor->setUsed(); 6535 MarkVTableUsed(CurrentLocation, ClassDecl); 6536 6537 if (ASTMutationListener *L = getASTMutationListener()) { 6538 L->CompletedImplicitDefinition(Constructor); 6539 } 6540} 6541 6542/// Get any existing defaulted default constructor for the given class. Do not 6543/// implicitly define one if it does not exist. 6544static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6545 CXXRecordDecl *D) { 6546 ASTContext &Context = Self.Context; 6547 QualType ClassType = Context.getTypeDeclType(D); 6548 DeclarationName ConstructorName 6549 = Context.DeclarationNames.getCXXConstructorName( 6550 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6551 6552 DeclContext::lookup_const_iterator Con, ConEnd; 6553 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6554 Con != ConEnd; ++Con) { 6555 // A function template cannot be defaulted. 6556 if (isa<FunctionTemplateDecl>(*Con)) 6557 continue; 6558 6559 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6560 if (Constructor->isDefaultConstructor()) 6561 return Constructor->isDefaulted() ? Constructor : 0; 6562 } 6563 return 0; 6564} 6565 6566void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6567 if (!D) return; 6568 AdjustDeclIfTemplate(D); 6569 6570 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6571 CXXConstructorDecl *CtorDecl 6572 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6573 6574 if (!CtorDecl) return; 6575 6576 // Compute the exception specification for the default constructor. 6577 const FunctionProtoType *CtorTy = 6578 CtorDecl->getType()->castAs<FunctionProtoType>(); 6579 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6580 ImplicitExceptionSpecification Spec = 6581 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6582 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6583 assert(EPI.ExceptionSpecType != EST_Delayed); 6584 6585 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6586 } 6587 6588 // If the default constructor is explicitly defaulted, checking the exception 6589 // specification is deferred until now. 6590 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6591 !ClassDecl->isDependentType()) 6592 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6593} 6594 6595void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6596 // We start with an initial pass over the base classes to collect those that 6597 // inherit constructors from. If there are none, we can forgo all further 6598 // processing. 6599 typedef SmallVector<const RecordType *, 4> BasesVector; 6600 BasesVector BasesToInheritFrom; 6601 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6602 BaseE = ClassDecl->bases_end(); 6603 BaseIt != BaseE; ++BaseIt) { 6604 if (BaseIt->getInheritConstructors()) { 6605 QualType Base = BaseIt->getType(); 6606 if (Base->isDependentType()) { 6607 // If we inherit constructors from anything that is dependent, just 6608 // abort processing altogether. We'll get another chance for the 6609 // instantiations. 6610 return; 6611 } 6612 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6613 } 6614 } 6615 if (BasesToInheritFrom.empty()) 6616 return; 6617 6618 // Now collect the constructors that we already have in the current class. 6619 // Those take precedence over inherited constructors. 6620 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6621 // unless there is a user-declared constructor with the same signature in 6622 // the class where the using-declaration appears. 6623 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6624 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6625 CtorE = ClassDecl->ctor_end(); 6626 CtorIt != CtorE; ++CtorIt) { 6627 ExistingConstructors.insert( 6628 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6629 } 6630 6631 Scope *S = getScopeForContext(ClassDecl); 6632 DeclarationName CreatedCtorName = 6633 Context.DeclarationNames.getCXXConstructorName( 6634 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6635 6636 // Now comes the true work. 6637 // First, we keep a map from constructor types to the base that introduced 6638 // them. Needed for finding conflicting constructors. We also keep the 6639 // actually inserted declarations in there, for pretty diagnostics. 6640 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6641 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6642 ConstructorToSourceMap InheritedConstructors; 6643 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6644 BaseE = BasesToInheritFrom.end(); 6645 BaseIt != BaseE; ++BaseIt) { 6646 const RecordType *Base = *BaseIt; 6647 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6648 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6649 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6650 CtorE = BaseDecl->ctor_end(); 6651 CtorIt != CtorE; ++CtorIt) { 6652 // Find the using declaration for inheriting this base's constructors. 6653 DeclarationName Name = 6654 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6655 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6656 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6657 SourceLocation UsingLoc = UD ? UD->getLocation() : 6658 ClassDecl->getLocation(); 6659 6660 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6661 // from the class X named in the using-declaration consists of actual 6662 // constructors and notional constructors that result from the 6663 // transformation of defaulted parameters as follows: 6664 // - all non-template default constructors of X, and 6665 // - for each non-template constructor of X that has at least one 6666 // parameter with a default argument, the set of constructors that 6667 // results from omitting any ellipsis parameter specification and 6668 // successively omitting parameters with a default argument from the 6669 // end of the parameter-type-list. 6670 CXXConstructorDecl *BaseCtor = *CtorIt; 6671 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6672 const FunctionProtoType *BaseCtorType = 6673 BaseCtor->getType()->getAs<FunctionProtoType>(); 6674 6675 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6676 maxParams = BaseCtor->getNumParams(); 6677 params <= maxParams; ++params) { 6678 // Skip default constructors. They're never inherited. 6679 if (params == 0) 6680 continue; 6681 // Skip copy and move constructors for the same reason. 6682 if (CanBeCopyOrMove && params == 1) 6683 continue; 6684 6685 // Build up a function type for this particular constructor. 6686 // FIXME: The working paper does not consider that the exception spec 6687 // for the inheriting constructor might be larger than that of the 6688 // source. This code doesn't yet, either. When it does, this code will 6689 // need to be delayed until after exception specifications and in-class 6690 // member initializers are attached. 6691 const Type *NewCtorType; 6692 if (params == maxParams) 6693 NewCtorType = BaseCtorType; 6694 else { 6695 SmallVector<QualType, 16> Args; 6696 for (unsigned i = 0; i < params; ++i) { 6697 Args.push_back(BaseCtorType->getArgType(i)); 6698 } 6699 FunctionProtoType::ExtProtoInfo ExtInfo = 6700 BaseCtorType->getExtProtoInfo(); 6701 ExtInfo.Variadic = false; 6702 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6703 Args.data(), params, ExtInfo) 6704 .getTypePtr(); 6705 } 6706 const Type *CanonicalNewCtorType = 6707 Context.getCanonicalType(NewCtorType); 6708 6709 // Now that we have the type, first check if the class already has a 6710 // constructor with this signature. 6711 if (ExistingConstructors.count(CanonicalNewCtorType)) 6712 continue; 6713 6714 // Then we check if we have already declared an inherited constructor 6715 // with this signature. 6716 std::pair<ConstructorToSourceMap::iterator, bool> result = 6717 InheritedConstructors.insert(std::make_pair( 6718 CanonicalNewCtorType, 6719 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6720 if (!result.second) { 6721 // Already in the map. If it came from a different class, that's an 6722 // error. Not if it's from the same. 6723 CanQualType PreviousBase = result.first->second.first; 6724 if (CanonicalBase != PreviousBase) { 6725 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6726 const CXXConstructorDecl *PrevBaseCtor = 6727 PrevCtor->getInheritedConstructor(); 6728 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6729 6730 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6731 Diag(BaseCtor->getLocation(), 6732 diag::note_using_decl_constructor_conflict_current_ctor); 6733 Diag(PrevBaseCtor->getLocation(), 6734 diag::note_using_decl_constructor_conflict_previous_ctor); 6735 Diag(PrevCtor->getLocation(), 6736 diag::note_using_decl_constructor_conflict_previous_using); 6737 } 6738 continue; 6739 } 6740 6741 // OK, we're there, now add the constructor. 6742 // C++0x [class.inhctor]p8: [...] that would be performed by a 6743 // user-written inline constructor [...] 6744 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6745 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6746 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6747 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6748 /*ImplicitlyDeclared=*/true, 6749 // FIXME: Due to a defect in the standard, we treat inherited 6750 // constructors as constexpr even if that makes them ill-formed. 6751 /*Constexpr=*/BaseCtor->isConstexpr()); 6752 NewCtor->setAccess(BaseCtor->getAccess()); 6753 6754 // Build up the parameter decls and add them. 6755 SmallVector<ParmVarDecl *, 16> ParamDecls; 6756 for (unsigned i = 0; i < params; ++i) { 6757 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 6758 UsingLoc, UsingLoc, 6759 /*IdentifierInfo=*/0, 6760 BaseCtorType->getArgType(i), 6761 /*TInfo=*/0, SC_None, 6762 SC_None, /*DefaultArg=*/0)); 6763 } 6764 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 6765 NewCtor->setInheritedConstructor(BaseCtor); 6766 6767 PushOnScopeChains(NewCtor, S, false); 6768 ClassDecl->addDecl(NewCtor); 6769 result.first->second.second = NewCtor; 6770 } 6771 } 6772 } 6773} 6774 6775Sema::ImplicitExceptionSpecification 6776Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6777 // C++ [except.spec]p14: 6778 // An implicitly declared special member function (Clause 12) shall have 6779 // an exception-specification. 6780 ImplicitExceptionSpecification ExceptSpec(Context); 6781 if (ClassDecl->isInvalidDecl()) 6782 return ExceptSpec; 6783 6784 // Direct base-class destructors. 6785 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6786 BEnd = ClassDecl->bases_end(); 6787 B != BEnd; ++B) { 6788 if (B->isVirtual()) // Handled below. 6789 continue; 6790 6791 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6792 ExceptSpec.CalledDecl( 6793 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6794 } 6795 6796 // Virtual base-class destructors. 6797 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6798 BEnd = ClassDecl->vbases_end(); 6799 B != BEnd; ++B) { 6800 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6801 ExceptSpec.CalledDecl( 6802 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6803 } 6804 6805 // Field destructors. 6806 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6807 FEnd = ClassDecl->field_end(); 6808 F != FEnd; ++F) { 6809 if (const RecordType *RecordTy 6810 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 6811 ExceptSpec.CalledDecl( 6812 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 6813 } 6814 6815 return ExceptSpec; 6816} 6817 6818CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 6819 // C++ [class.dtor]p2: 6820 // If a class has no user-declared destructor, a destructor is 6821 // declared implicitly. An implicitly-declared destructor is an 6822 // inline public member of its class. 6823 6824 ImplicitExceptionSpecification Spec = 6825 ComputeDefaultedDtorExceptionSpec(ClassDecl); 6826 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6827 6828 // Create the actual destructor declaration. 6829 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 6830 6831 CanQualType ClassType 6832 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6833 SourceLocation ClassLoc = ClassDecl->getLocation(); 6834 DeclarationName Name 6835 = Context.DeclarationNames.getCXXDestructorName(ClassType); 6836 DeclarationNameInfo NameInfo(Name, ClassLoc); 6837 CXXDestructorDecl *Destructor 6838 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 6839 /*isInline=*/true, 6840 /*isImplicitlyDeclared=*/true); 6841 Destructor->setAccess(AS_public); 6842 Destructor->setDefaulted(); 6843 Destructor->setImplicit(); 6844 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 6845 6846 // Note that we have declared this destructor. 6847 ++ASTContext::NumImplicitDestructorsDeclared; 6848 6849 // Introduce this destructor into its scope. 6850 if (Scope *S = getScopeForContext(ClassDecl)) 6851 PushOnScopeChains(Destructor, S, false); 6852 ClassDecl->addDecl(Destructor); 6853 6854 // This could be uniqued if it ever proves significant. 6855 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 6856 6857 if (ShouldDeleteDestructor(Destructor)) 6858 Destructor->setDeletedAsWritten(); 6859 6860 AddOverriddenMethods(ClassDecl, Destructor); 6861 6862 return Destructor; 6863} 6864 6865void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 6866 CXXDestructorDecl *Destructor) { 6867 assert((Destructor->isDefaulted() && 6868 !Destructor->doesThisDeclarationHaveABody()) && 6869 "DefineImplicitDestructor - call it for implicit default dtor"); 6870 CXXRecordDecl *ClassDecl = Destructor->getParent(); 6871 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 6872 6873 if (Destructor->isInvalidDecl()) 6874 return; 6875 6876 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 6877 6878 DiagnosticErrorTrap Trap(Diags); 6879 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6880 Destructor->getParent()); 6881 6882 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 6883 Diag(CurrentLocation, diag::note_member_synthesized_at) 6884 << CXXDestructor << Context.getTagDeclType(ClassDecl); 6885 6886 Destructor->setInvalidDecl(); 6887 return; 6888 } 6889 6890 SourceLocation Loc = Destructor->getLocation(); 6891 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6892 6893 Destructor->setUsed(); 6894 MarkVTableUsed(CurrentLocation, ClassDecl); 6895 6896 if (ASTMutationListener *L = getASTMutationListener()) { 6897 L->CompletedImplicitDefinition(Destructor); 6898 } 6899} 6900 6901void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 6902 CXXDestructorDecl *destructor) { 6903 // C++11 [class.dtor]p3: 6904 // A declaration of a destructor that does not have an exception- 6905 // specification is implicitly considered to have the same exception- 6906 // specification as an implicit declaration. 6907 const FunctionProtoType *dtorType = destructor->getType()-> 6908 getAs<FunctionProtoType>(); 6909 if (dtorType->hasExceptionSpec()) 6910 return; 6911 6912 ImplicitExceptionSpecification exceptSpec = 6913 ComputeDefaultedDtorExceptionSpec(classDecl); 6914 6915 // Replace the destructor's type. 6916 FunctionProtoType::ExtProtoInfo epi; 6917 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 6918 epi.NumExceptions = exceptSpec.size(); 6919 epi.Exceptions = exceptSpec.data(); 6920 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 6921 6922 destructor->setType(ty); 6923 6924 // FIXME: If the destructor has a body that could throw, and the newly created 6925 // spec doesn't allow exceptions, we should emit a warning, because this 6926 // change in behavior can break conforming C++03 programs at runtime. 6927 // However, we don't have a body yet, so it needs to be done somewhere else. 6928} 6929 6930/// \brief Builds a statement that copies/moves the given entity from \p From to 6931/// \c To. 6932/// 6933/// This routine is used to copy/move the members of a class with an 6934/// implicitly-declared copy/move assignment operator. When the entities being 6935/// copied are arrays, this routine builds for loops to copy them. 6936/// 6937/// \param S The Sema object used for type-checking. 6938/// 6939/// \param Loc The location where the implicit copy/move is being generated. 6940/// 6941/// \param T The type of the expressions being copied/moved. Both expressions 6942/// must have this type. 6943/// 6944/// \param To The expression we are copying/moving to. 6945/// 6946/// \param From The expression we are copying/moving from. 6947/// 6948/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 6949/// Otherwise, it's a non-static member subobject. 6950/// 6951/// \param Copying Whether we're copying or moving. 6952/// 6953/// \param Depth Internal parameter recording the depth of the recursion. 6954/// 6955/// \returns A statement or a loop that copies the expressions. 6956static StmtResult 6957BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 6958 Expr *To, Expr *From, 6959 bool CopyingBaseSubobject, bool Copying, 6960 unsigned Depth = 0) { 6961 // C++0x [class.copy]p28: 6962 // Each subobject is assigned in the manner appropriate to its type: 6963 // 6964 // - if the subobject is of class type, as if by a call to operator= with 6965 // the subobject as the object expression and the corresponding 6966 // subobject of x as a single function argument (as if by explicit 6967 // qualification; that is, ignoring any possible virtual overriding 6968 // functions in more derived classes); 6969 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 6970 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6971 6972 // Look for operator=. 6973 DeclarationName Name 6974 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6975 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 6976 S.LookupQualifiedName(OpLookup, ClassDecl, false); 6977 6978 // Filter out any result that isn't a copy/move-assignment operator. 6979 LookupResult::Filter F = OpLookup.makeFilter(); 6980 while (F.hasNext()) { 6981 NamedDecl *D = F.next(); 6982 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 6983 if (Copying ? Method->isCopyAssignmentOperator() : 6984 Method->isMoveAssignmentOperator()) 6985 continue; 6986 6987 F.erase(); 6988 } 6989 F.done(); 6990 6991 // Suppress the protected check (C++ [class.protected]) for each of the 6992 // assignment operators we found. This strange dance is required when 6993 // we're assigning via a base classes's copy-assignment operator. To 6994 // ensure that we're getting the right base class subobject (without 6995 // ambiguities), we need to cast "this" to that subobject type; to 6996 // ensure that we don't go through the virtual call mechanism, we need 6997 // to qualify the operator= name with the base class (see below). However, 6998 // this means that if the base class has a protected copy assignment 6999 // operator, the protected member access check will fail. So, we 7000 // rewrite "protected" access to "public" access in this case, since we 7001 // know by construction that we're calling from a derived class. 7002 if (CopyingBaseSubobject) { 7003 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7004 L != LEnd; ++L) { 7005 if (L.getAccess() == AS_protected) 7006 L.setAccess(AS_public); 7007 } 7008 } 7009 7010 // Create the nested-name-specifier that will be used to qualify the 7011 // reference to operator=; this is required to suppress the virtual 7012 // call mechanism. 7013 CXXScopeSpec SS; 7014 SS.MakeTrivial(S.Context, 7015 NestedNameSpecifier::Create(S.Context, 0, false, 7016 T.getTypePtr()), 7017 Loc); 7018 7019 // Create the reference to operator=. 7020 ExprResult OpEqualRef 7021 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7022 /*FirstQualifierInScope=*/0, OpLookup, 7023 /*TemplateArgs=*/0, 7024 /*SuppressQualifierCheck=*/true); 7025 if (OpEqualRef.isInvalid()) 7026 return StmtError(); 7027 7028 // Build the call to the assignment operator. 7029 7030 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7031 OpEqualRef.takeAs<Expr>(), 7032 Loc, &From, 1, Loc); 7033 if (Call.isInvalid()) 7034 return StmtError(); 7035 7036 return S.Owned(Call.takeAs<Stmt>()); 7037 } 7038 7039 // - if the subobject is of scalar type, the built-in assignment 7040 // operator is used. 7041 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7042 if (!ArrayTy) { 7043 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7044 if (Assignment.isInvalid()) 7045 return StmtError(); 7046 7047 return S.Owned(Assignment.takeAs<Stmt>()); 7048 } 7049 7050 // - if the subobject is an array, each element is assigned, in the 7051 // manner appropriate to the element type; 7052 7053 // Construct a loop over the array bounds, e.g., 7054 // 7055 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7056 // 7057 // that will copy each of the array elements. 7058 QualType SizeType = S.Context.getSizeType(); 7059 7060 // Create the iteration variable. 7061 IdentifierInfo *IterationVarName = 0; 7062 { 7063 llvm::SmallString<8> Str; 7064 llvm::raw_svector_ostream OS(Str); 7065 OS << "__i" << Depth; 7066 IterationVarName = &S.Context.Idents.get(OS.str()); 7067 } 7068 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7069 IterationVarName, SizeType, 7070 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7071 SC_None, SC_None); 7072 7073 // Initialize the iteration variable to zero. 7074 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7075 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7076 7077 // Create a reference to the iteration variable; we'll use this several 7078 // times throughout. 7079 Expr *IterationVarRef 7080 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7081 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7082 7083 // Create the DeclStmt that holds the iteration variable. 7084 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7085 7086 // Create the comparison against the array bound. 7087 llvm::APInt Upper 7088 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7089 Expr *Comparison 7090 = new (S.Context) BinaryOperator(IterationVarRef, 7091 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7092 BO_NE, S.Context.BoolTy, 7093 VK_RValue, OK_Ordinary, Loc); 7094 7095 // Create the pre-increment of the iteration variable. 7096 Expr *Increment 7097 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7098 VK_LValue, OK_Ordinary, Loc); 7099 7100 // Subscript the "from" and "to" expressions with the iteration variable. 7101 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7102 IterationVarRef, Loc)); 7103 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7104 IterationVarRef, Loc)); 7105 if (!Copying) // Cast to rvalue 7106 From = CastForMoving(S, From); 7107 7108 // Build the copy/move for an individual element of the array. 7109 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7110 To, From, CopyingBaseSubobject, 7111 Copying, Depth + 1); 7112 if (Copy.isInvalid()) 7113 return StmtError(); 7114 7115 // Construct the loop that copies all elements of this array. 7116 return S.ActOnForStmt(Loc, Loc, InitStmt, 7117 S.MakeFullExpr(Comparison), 7118 0, S.MakeFullExpr(Increment), 7119 Loc, Copy.take()); 7120} 7121 7122std::pair<Sema::ImplicitExceptionSpecification, bool> 7123Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7124 CXXRecordDecl *ClassDecl) { 7125 if (ClassDecl->isInvalidDecl()) 7126 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7127 7128 // C++ [class.copy]p10: 7129 // If the class definition does not explicitly declare a copy 7130 // assignment operator, one is declared implicitly. 7131 // The implicitly-defined copy assignment operator for a class X 7132 // will have the form 7133 // 7134 // X& X::operator=(const X&) 7135 // 7136 // if 7137 bool HasConstCopyAssignment = true; 7138 7139 // -- each direct base class B of X has a copy assignment operator 7140 // whose parameter is of type const B&, const volatile B& or B, 7141 // and 7142 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7143 BaseEnd = ClassDecl->bases_end(); 7144 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7145 // We'll handle this below 7146 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7147 continue; 7148 7149 assert(!Base->getType()->isDependentType() && 7150 "Cannot generate implicit members for class with dependent bases."); 7151 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7152 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7153 &HasConstCopyAssignment); 7154 } 7155 7156 // In C++0x, the above citation has "or virtual added" 7157 if (LangOpts.CPlusPlus0x) { 7158 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7159 BaseEnd = ClassDecl->vbases_end(); 7160 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7161 assert(!Base->getType()->isDependentType() && 7162 "Cannot generate implicit members for class with dependent bases."); 7163 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7164 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7165 &HasConstCopyAssignment); 7166 } 7167 } 7168 7169 // -- for all the nonstatic data members of X that are of a class 7170 // type M (or array thereof), each such class type has a copy 7171 // assignment operator whose parameter is of type const M&, 7172 // const volatile M& or M. 7173 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7174 FieldEnd = ClassDecl->field_end(); 7175 HasConstCopyAssignment && Field != FieldEnd; 7176 ++Field) { 7177 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7178 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7179 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7180 &HasConstCopyAssignment); 7181 } 7182 } 7183 7184 // Otherwise, the implicitly declared copy assignment operator will 7185 // have the form 7186 // 7187 // X& X::operator=(X&) 7188 7189 // C++ [except.spec]p14: 7190 // An implicitly declared special member function (Clause 12) shall have an 7191 // exception-specification. [...] 7192 7193 // It is unspecified whether or not an implicit copy assignment operator 7194 // attempts to deduplicate calls to assignment operators of virtual bases are 7195 // made. As such, this exception specification is effectively unspecified. 7196 // Based on a similar decision made for constness in C++0x, we're erring on 7197 // the side of assuming such calls to be made regardless of whether they 7198 // actually happen. 7199 ImplicitExceptionSpecification ExceptSpec(Context); 7200 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7201 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7202 BaseEnd = ClassDecl->bases_end(); 7203 Base != BaseEnd; ++Base) { 7204 if (Base->isVirtual()) 7205 continue; 7206 7207 CXXRecordDecl *BaseClassDecl 7208 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7209 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7210 ArgQuals, false, 0)) 7211 ExceptSpec.CalledDecl(CopyAssign); 7212 } 7213 7214 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7215 BaseEnd = ClassDecl->vbases_end(); 7216 Base != BaseEnd; ++Base) { 7217 CXXRecordDecl *BaseClassDecl 7218 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7219 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7220 ArgQuals, false, 0)) 7221 ExceptSpec.CalledDecl(CopyAssign); 7222 } 7223 7224 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7225 FieldEnd = ClassDecl->field_end(); 7226 Field != FieldEnd; 7227 ++Field) { 7228 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7229 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7230 if (CXXMethodDecl *CopyAssign = 7231 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7232 ExceptSpec.CalledDecl(CopyAssign); 7233 } 7234 } 7235 7236 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7237} 7238 7239CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7240 // Note: The following rules are largely analoguous to the copy 7241 // constructor rules. Note that virtual bases are not taken into account 7242 // for determining the argument type of the operator. Note also that 7243 // operators taking an object instead of a reference are allowed. 7244 7245 ImplicitExceptionSpecification Spec(Context); 7246 bool Const; 7247 llvm::tie(Spec, Const) = 7248 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7249 7250 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7251 QualType RetType = Context.getLValueReferenceType(ArgType); 7252 if (Const) 7253 ArgType = ArgType.withConst(); 7254 ArgType = Context.getLValueReferenceType(ArgType); 7255 7256 // An implicitly-declared copy assignment operator is an inline public 7257 // member of its class. 7258 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7259 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7260 SourceLocation ClassLoc = ClassDecl->getLocation(); 7261 DeclarationNameInfo NameInfo(Name, ClassLoc); 7262 CXXMethodDecl *CopyAssignment 7263 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7264 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7265 /*TInfo=*/0, /*isStatic=*/false, 7266 /*StorageClassAsWritten=*/SC_None, 7267 /*isInline=*/true, /*isConstexpr=*/false, 7268 SourceLocation()); 7269 CopyAssignment->setAccess(AS_public); 7270 CopyAssignment->setDefaulted(); 7271 CopyAssignment->setImplicit(); 7272 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7273 7274 // Add the parameter to the operator. 7275 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7276 ClassLoc, ClassLoc, /*Id=*/0, 7277 ArgType, /*TInfo=*/0, 7278 SC_None, 7279 SC_None, 0); 7280 CopyAssignment->setParams(&FromParam, 1); 7281 7282 // Note that we have added this copy-assignment operator. 7283 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7284 7285 if (Scope *S = getScopeForContext(ClassDecl)) 7286 PushOnScopeChains(CopyAssignment, S, false); 7287 ClassDecl->addDecl(CopyAssignment); 7288 7289 // C++0x [class.copy]p18: 7290 // ... If the class definition declares a move constructor or move 7291 // assignment operator, the implicitly declared copy assignment operator is 7292 // defined as deleted; ... 7293 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7294 ClassDecl->hasUserDeclaredMoveAssignment() || 7295 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7296 CopyAssignment->setDeletedAsWritten(); 7297 7298 AddOverriddenMethods(ClassDecl, CopyAssignment); 7299 return CopyAssignment; 7300} 7301 7302void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7303 CXXMethodDecl *CopyAssignOperator) { 7304 assert((CopyAssignOperator->isDefaulted() && 7305 CopyAssignOperator->isOverloadedOperator() && 7306 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7307 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7308 "DefineImplicitCopyAssignment called for wrong function"); 7309 7310 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7311 7312 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7313 CopyAssignOperator->setInvalidDecl(); 7314 return; 7315 } 7316 7317 CopyAssignOperator->setUsed(); 7318 7319 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7320 DiagnosticErrorTrap Trap(Diags); 7321 7322 // C++0x [class.copy]p30: 7323 // The implicitly-defined or explicitly-defaulted copy assignment operator 7324 // for a non-union class X performs memberwise copy assignment of its 7325 // subobjects. The direct base classes of X are assigned first, in the 7326 // order of their declaration in the base-specifier-list, and then the 7327 // immediate non-static data members of X are assigned, in the order in 7328 // which they were declared in the class definition. 7329 7330 // The statements that form the synthesized function body. 7331 ASTOwningVector<Stmt*> Statements(*this); 7332 7333 // The parameter for the "other" object, which we are copying from. 7334 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7335 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7336 QualType OtherRefType = Other->getType(); 7337 if (const LValueReferenceType *OtherRef 7338 = OtherRefType->getAs<LValueReferenceType>()) { 7339 OtherRefType = OtherRef->getPointeeType(); 7340 OtherQuals = OtherRefType.getQualifiers(); 7341 } 7342 7343 // Our location for everything implicitly-generated. 7344 SourceLocation Loc = CopyAssignOperator->getLocation(); 7345 7346 // Construct a reference to the "other" object. We'll be using this 7347 // throughout the generated ASTs. 7348 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7349 assert(OtherRef && "Reference to parameter cannot fail!"); 7350 7351 // Construct the "this" pointer. We'll be using this throughout the generated 7352 // ASTs. 7353 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7354 assert(This && "Reference to this cannot fail!"); 7355 7356 // Assign base classes. 7357 bool Invalid = false; 7358 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7359 E = ClassDecl->bases_end(); Base != E; ++Base) { 7360 // Form the assignment: 7361 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7362 QualType BaseType = Base->getType().getUnqualifiedType(); 7363 if (!BaseType->isRecordType()) { 7364 Invalid = true; 7365 continue; 7366 } 7367 7368 CXXCastPath BasePath; 7369 BasePath.push_back(Base); 7370 7371 // Construct the "from" expression, which is an implicit cast to the 7372 // appropriately-qualified base type. 7373 Expr *From = OtherRef; 7374 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7375 CK_UncheckedDerivedToBase, 7376 VK_LValue, &BasePath).take(); 7377 7378 // Dereference "this". 7379 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7380 7381 // Implicitly cast "this" to the appropriately-qualified base type. 7382 To = ImpCastExprToType(To.take(), 7383 Context.getCVRQualifiedType(BaseType, 7384 CopyAssignOperator->getTypeQualifiers()), 7385 CK_UncheckedDerivedToBase, 7386 VK_LValue, &BasePath); 7387 7388 // Build the copy. 7389 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7390 To.get(), From, 7391 /*CopyingBaseSubobject=*/true, 7392 /*Copying=*/true); 7393 if (Copy.isInvalid()) { 7394 Diag(CurrentLocation, diag::note_member_synthesized_at) 7395 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7396 CopyAssignOperator->setInvalidDecl(); 7397 return; 7398 } 7399 7400 // Success! Record the copy. 7401 Statements.push_back(Copy.takeAs<Expr>()); 7402 } 7403 7404 // \brief Reference to the __builtin_memcpy function. 7405 Expr *BuiltinMemCpyRef = 0; 7406 // \brief Reference to the __builtin_objc_memmove_collectable function. 7407 Expr *CollectableMemCpyRef = 0; 7408 7409 // Assign non-static members. 7410 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7411 FieldEnd = ClassDecl->field_end(); 7412 Field != FieldEnd; ++Field) { 7413 // Check for members of reference type; we can't copy those. 7414 if (Field->getType()->isReferenceType()) { 7415 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7416 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7417 Diag(Field->getLocation(), diag::note_declared_at); 7418 Diag(CurrentLocation, diag::note_member_synthesized_at) 7419 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7420 Invalid = true; 7421 continue; 7422 } 7423 7424 // Check for members of const-qualified, non-class type. 7425 QualType BaseType = Context.getBaseElementType(Field->getType()); 7426 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7427 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7428 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7429 Diag(Field->getLocation(), diag::note_declared_at); 7430 Diag(CurrentLocation, diag::note_member_synthesized_at) 7431 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7432 Invalid = true; 7433 continue; 7434 } 7435 7436 // Suppress assigning zero-width bitfields. 7437 if (const Expr *Width = Field->getBitWidth()) 7438 if (Width->EvaluateAsInt(Context) == 0) 7439 continue; 7440 7441 QualType FieldType = Field->getType().getNonReferenceType(); 7442 if (FieldType->isIncompleteArrayType()) { 7443 assert(ClassDecl->hasFlexibleArrayMember() && 7444 "Incomplete array type is not valid"); 7445 continue; 7446 } 7447 7448 // Build references to the field in the object we're copying from and to. 7449 CXXScopeSpec SS; // Intentionally empty 7450 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7451 LookupMemberName); 7452 MemberLookup.addDecl(*Field); 7453 MemberLookup.resolveKind(); 7454 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7455 Loc, /*IsArrow=*/false, 7456 SS, 0, MemberLookup, 0); 7457 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7458 Loc, /*IsArrow=*/true, 7459 SS, 0, MemberLookup, 0); 7460 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7461 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7462 7463 // If the field should be copied with __builtin_memcpy rather than via 7464 // explicit assignments, do so. This optimization only applies for arrays 7465 // of scalars and arrays of class type with trivial copy-assignment 7466 // operators. 7467 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7468 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7469 // Compute the size of the memory buffer to be copied. 7470 QualType SizeType = Context.getSizeType(); 7471 llvm::APInt Size(Context.getTypeSize(SizeType), 7472 Context.getTypeSizeInChars(BaseType).getQuantity()); 7473 for (const ConstantArrayType *Array 7474 = Context.getAsConstantArrayType(FieldType); 7475 Array; 7476 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7477 llvm::APInt ArraySize 7478 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7479 Size *= ArraySize; 7480 } 7481 7482 // Take the address of the field references for "from" and "to". 7483 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7484 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7485 7486 bool NeedsCollectableMemCpy = 7487 (BaseType->isRecordType() && 7488 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7489 7490 if (NeedsCollectableMemCpy) { 7491 if (!CollectableMemCpyRef) { 7492 // Create a reference to the __builtin_objc_memmove_collectable function. 7493 LookupResult R(*this, 7494 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7495 Loc, LookupOrdinaryName); 7496 LookupName(R, TUScope, true); 7497 7498 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7499 if (!CollectableMemCpy) { 7500 // Something went horribly wrong earlier, and we will have 7501 // complained about it. 7502 Invalid = true; 7503 continue; 7504 } 7505 7506 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7507 CollectableMemCpy->getType(), 7508 VK_LValue, Loc, 0).take(); 7509 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7510 } 7511 } 7512 // Create a reference to the __builtin_memcpy builtin function. 7513 else if (!BuiltinMemCpyRef) { 7514 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7515 LookupOrdinaryName); 7516 LookupName(R, TUScope, true); 7517 7518 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7519 if (!BuiltinMemCpy) { 7520 // Something went horribly wrong earlier, and we will have complained 7521 // about it. 7522 Invalid = true; 7523 continue; 7524 } 7525 7526 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7527 BuiltinMemCpy->getType(), 7528 VK_LValue, Loc, 0).take(); 7529 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7530 } 7531 7532 ASTOwningVector<Expr*> CallArgs(*this); 7533 CallArgs.push_back(To.takeAs<Expr>()); 7534 CallArgs.push_back(From.takeAs<Expr>()); 7535 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7536 ExprResult Call = ExprError(); 7537 if (NeedsCollectableMemCpy) 7538 Call = ActOnCallExpr(/*Scope=*/0, 7539 CollectableMemCpyRef, 7540 Loc, move_arg(CallArgs), 7541 Loc); 7542 else 7543 Call = ActOnCallExpr(/*Scope=*/0, 7544 BuiltinMemCpyRef, 7545 Loc, move_arg(CallArgs), 7546 Loc); 7547 7548 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7549 Statements.push_back(Call.takeAs<Expr>()); 7550 continue; 7551 } 7552 7553 // Build the copy of this field. 7554 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7555 To.get(), From.get(), 7556 /*CopyingBaseSubobject=*/false, 7557 /*Copying=*/true); 7558 if (Copy.isInvalid()) { 7559 Diag(CurrentLocation, diag::note_member_synthesized_at) 7560 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7561 CopyAssignOperator->setInvalidDecl(); 7562 return; 7563 } 7564 7565 // Success! Record the copy. 7566 Statements.push_back(Copy.takeAs<Stmt>()); 7567 } 7568 7569 if (!Invalid) { 7570 // Add a "return *this;" 7571 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7572 7573 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7574 if (Return.isInvalid()) 7575 Invalid = true; 7576 else { 7577 Statements.push_back(Return.takeAs<Stmt>()); 7578 7579 if (Trap.hasErrorOccurred()) { 7580 Diag(CurrentLocation, diag::note_member_synthesized_at) 7581 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7582 Invalid = true; 7583 } 7584 } 7585 } 7586 7587 if (Invalid) { 7588 CopyAssignOperator->setInvalidDecl(); 7589 return; 7590 } 7591 7592 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7593 /*isStmtExpr=*/false); 7594 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7595 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7596 7597 if (ASTMutationListener *L = getASTMutationListener()) { 7598 L->CompletedImplicitDefinition(CopyAssignOperator); 7599 } 7600} 7601 7602Sema::ImplicitExceptionSpecification 7603Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7604 ImplicitExceptionSpecification ExceptSpec(Context); 7605 7606 if (ClassDecl->isInvalidDecl()) 7607 return ExceptSpec; 7608 7609 // C++0x [except.spec]p14: 7610 // An implicitly declared special member function (Clause 12) shall have an 7611 // exception-specification. [...] 7612 7613 // It is unspecified whether or not an implicit move assignment operator 7614 // attempts to deduplicate calls to assignment operators of virtual bases are 7615 // made. As such, this exception specification is effectively unspecified. 7616 // Based on a similar decision made for constness in C++0x, we're erring on 7617 // the side of assuming such calls to be made regardless of whether they 7618 // actually happen. 7619 // Note that a move constructor is not implicitly declared when there are 7620 // virtual bases, but it can still be user-declared and explicitly defaulted. 7621 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7622 BaseEnd = ClassDecl->bases_end(); 7623 Base != BaseEnd; ++Base) { 7624 if (Base->isVirtual()) 7625 continue; 7626 7627 CXXRecordDecl *BaseClassDecl 7628 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7629 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7630 false, 0)) 7631 ExceptSpec.CalledDecl(MoveAssign); 7632 } 7633 7634 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7635 BaseEnd = ClassDecl->vbases_end(); 7636 Base != BaseEnd; ++Base) { 7637 CXXRecordDecl *BaseClassDecl 7638 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7639 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7640 false, 0)) 7641 ExceptSpec.CalledDecl(MoveAssign); 7642 } 7643 7644 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7645 FieldEnd = ClassDecl->field_end(); 7646 Field != FieldEnd; 7647 ++Field) { 7648 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7649 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7650 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7651 false, 0)) 7652 ExceptSpec.CalledDecl(MoveAssign); 7653 } 7654 } 7655 7656 return ExceptSpec; 7657} 7658 7659CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 7660 // Note: The following rules are largely analoguous to the move 7661 // constructor rules. 7662 7663 ImplicitExceptionSpecification Spec( 7664 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 7665 7666 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7667 QualType RetType = Context.getLValueReferenceType(ArgType); 7668 ArgType = Context.getRValueReferenceType(ArgType); 7669 7670 // An implicitly-declared move assignment operator is an inline public 7671 // member of its class. 7672 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7673 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7674 SourceLocation ClassLoc = ClassDecl->getLocation(); 7675 DeclarationNameInfo NameInfo(Name, ClassLoc); 7676 CXXMethodDecl *MoveAssignment 7677 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7678 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7679 /*TInfo=*/0, /*isStatic=*/false, 7680 /*StorageClassAsWritten=*/SC_None, 7681 /*isInline=*/true, 7682 /*isConstexpr=*/false, 7683 SourceLocation()); 7684 MoveAssignment->setAccess(AS_public); 7685 MoveAssignment->setDefaulted(); 7686 MoveAssignment->setImplicit(); 7687 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 7688 7689 // Add the parameter to the operator. 7690 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 7691 ClassLoc, ClassLoc, /*Id=*/0, 7692 ArgType, /*TInfo=*/0, 7693 SC_None, 7694 SC_None, 0); 7695 MoveAssignment->setParams(&FromParam, 1); 7696 7697 // Note that we have added this copy-assignment operator. 7698 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 7699 7700 // C++0x [class.copy]p9: 7701 // If the definition of a class X does not explicitly declare a move 7702 // assignment operator, one will be implicitly declared as defaulted if and 7703 // only if: 7704 // [...] 7705 // - the move assignment operator would not be implicitly defined as 7706 // deleted. 7707 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 7708 // Cache this result so that we don't try to generate this over and over 7709 // on every lookup, leaking memory and wasting time. 7710 ClassDecl->setFailedImplicitMoveAssignment(); 7711 return 0; 7712 } 7713 7714 if (Scope *S = getScopeForContext(ClassDecl)) 7715 PushOnScopeChains(MoveAssignment, S, false); 7716 ClassDecl->addDecl(MoveAssignment); 7717 7718 AddOverriddenMethods(ClassDecl, MoveAssignment); 7719 return MoveAssignment; 7720} 7721 7722void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 7723 CXXMethodDecl *MoveAssignOperator) { 7724 assert((MoveAssignOperator->isDefaulted() && 7725 MoveAssignOperator->isOverloadedOperator() && 7726 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 7727 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 7728 "DefineImplicitMoveAssignment called for wrong function"); 7729 7730 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 7731 7732 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 7733 MoveAssignOperator->setInvalidDecl(); 7734 return; 7735 } 7736 7737 MoveAssignOperator->setUsed(); 7738 7739 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 7740 DiagnosticErrorTrap Trap(Diags); 7741 7742 // C++0x [class.copy]p28: 7743 // The implicitly-defined or move assignment operator for a non-union class 7744 // X performs memberwise move assignment of its subobjects. The direct base 7745 // classes of X are assigned first, in the order of their declaration in the 7746 // base-specifier-list, and then the immediate non-static data members of X 7747 // are assigned, in the order in which they were declared in the class 7748 // definition. 7749 7750 // The statements that form the synthesized function body. 7751 ASTOwningVector<Stmt*> Statements(*this); 7752 7753 // The parameter for the "other" object, which we are move from. 7754 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 7755 QualType OtherRefType = Other->getType()-> 7756 getAs<RValueReferenceType>()->getPointeeType(); 7757 assert(OtherRefType.getQualifiers() == 0 && 7758 "Bad argument type of defaulted move assignment"); 7759 7760 // Our location for everything implicitly-generated. 7761 SourceLocation Loc = MoveAssignOperator->getLocation(); 7762 7763 // Construct a reference to the "other" object. We'll be using this 7764 // throughout the generated ASTs. 7765 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7766 assert(OtherRef && "Reference to parameter cannot fail!"); 7767 // Cast to rvalue. 7768 OtherRef = CastForMoving(*this, OtherRef); 7769 7770 // Construct the "this" pointer. We'll be using this throughout the generated 7771 // ASTs. 7772 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7773 assert(This && "Reference to this cannot fail!"); 7774 7775 // Assign base classes. 7776 bool Invalid = false; 7777 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7778 E = ClassDecl->bases_end(); Base != E; ++Base) { 7779 // Form the assignment: 7780 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 7781 QualType BaseType = Base->getType().getUnqualifiedType(); 7782 if (!BaseType->isRecordType()) { 7783 Invalid = true; 7784 continue; 7785 } 7786 7787 CXXCastPath BasePath; 7788 BasePath.push_back(Base); 7789 7790 // Construct the "from" expression, which is an implicit cast to the 7791 // appropriately-qualified base type. 7792 Expr *From = OtherRef; 7793 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 7794 VK_RValue, &BasePath).take(); 7795 7796 // Dereference "this". 7797 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7798 7799 // Implicitly cast "this" to the appropriately-qualified base type. 7800 To = ImpCastExprToType(To.take(), 7801 Context.getCVRQualifiedType(BaseType, 7802 MoveAssignOperator->getTypeQualifiers()), 7803 CK_UncheckedDerivedToBase, 7804 VK_LValue, &BasePath); 7805 7806 // Build the move. 7807 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 7808 To.get(), From, 7809 /*CopyingBaseSubobject=*/true, 7810 /*Copying=*/false); 7811 if (Move.isInvalid()) { 7812 Diag(CurrentLocation, diag::note_member_synthesized_at) 7813 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 7814 MoveAssignOperator->setInvalidDecl(); 7815 return; 7816 } 7817 7818 // Success! Record the move. 7819 Statements.push_back(Move.takeAs<Expr>()); 7820 } 7821 7822 // \brief Reference to the __builtin_memcpy function. 7823 Expr *BuiltinMemCpyRef = 0; 7824 // \brief Reference to the __builtin_objc_memmove_collectable function. 7825 Expr *CollectableMemCpyRef = 0; 7826 7827 // Assign non-static members. 7828 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7829 FieldEnd = ClassDecl->field_end(); 7830 Field != FieldEnd; ++Field) { 7831 // Check for members of reference type; we can't move those. 7832 if (Field->getType()->isReferenceType()) { 7833 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7834 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7835 Diag(Field->getLocation(), diag::note_declared_at); 7836 Diag(CurrentLocation, diag::note_member_synthesized_at) 7837 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 7838 Invalid = true; 7839 continue; 7840 } 7841 7842 // Check for members of const-qualified, non-class type. 7843 QualType BaseType = Context.getBaseElementType(Field->getType()); 7844 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7845 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7846 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7847 Diag(Field->getLocation(), diag::note_declared_at); 7848 Diag(CurrentLocation, diag::note_member_synthesized_at) 7849 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 7850 Invalid = true; 7851 continue; 7852 } 7853 7854 // Suppress assigning zero-width bitfields. 7855 if (const Expr *Width = Field->getBitWidth()) 7856 if (Width->EvaluateAsInt(Context) == 0) 7857 continue; 7858 7859 QualType FieldType = Field->getType().getNonReferenceType(); 7860 if (FieldType->isIncompleteArrayType()) { 7861 assert(ClassDecl->hasFlexibleArrayMember() && 7862 "Incomplete array type is not valid"); 7863 continue; 7864 } 7865 7866 // Build references to the field in the object we're copying from and to. 7867 CXXScopeSpec SS; // Intentionally empty 7868 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7869 LookupMemberName); 7870 MemberLookup.addDecl(*Field); 7871 MemberLookup.resolveKind(); 7872 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7873 Loc, /*IsArrow=*/false, 7874 SS, 0, MemberLookup, 0); 7875 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7876 Loc, /*IsArrow=*/true, 7877 SS, 0, MemberLookup, 0); 7878 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7879 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7880 7881 assert(!From.get()->isLValue() && // could be xvalue or prvalue 7882 "Member reference with rvalue base must be rvalue except for reference " 7883 "members, which aren't allowed for move assignment."); 7884 7885 // If the field should be copied with __builtin_memcpy rather than via 7886 // explicit assignments, do so. This optimization only applies for arrays 7887 // of scalars and arrays of class type with trivial move-assignment 7888 // operators. 7889 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7890 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 7891 // Compute the size of the memory buffer to be copied. 7892 QualType SizeType = Context.getSizeType(); 7893 llvm::APInt Size(Context.getTypeSize(SizeType), 7894 Context.getTypeSizeInChars(BaseType).getQuantity()); 7895 for (const ConstantArrayType *Array 7896 = Context.getAsConstantArrayType(FieldType); 7897 Array; 7898 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7899 llvm::APInt ArraySize 7900 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7901 Size *= ArraySize; 7902 } 7903 7904 // Take the address of the field references for "from" and "to". 7905 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7906 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7907 7908 bool NeedsCollectableMemCpy = 7909 (BaseType->isRecordType() && 7910 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7911 7912 if (NeedsCollectableMemCpy) { 7913 if (!CollectableMemCpyRef) { 7914 // Create a reference to the __builtin_objc_memmove_collectable function. 7915 LookupResult R(*this, 7916 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7917 Loc, LookupOrdinaryName); 7918 LookupName(R, TUScope, true); 7919 7920 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7921 if (!CollectableMemCpy) { 7922 // Something went horribly wrong earlier, and we will have 7923 // complained about it. 7924 Invalid = true; 7925 continue; 7926 } 7927 7928 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7929 CollectableMemCpy->getType(), 7930 VK_LValue, Loc, 0).take(); 7931 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7932 } 7933 } 7934 // Create a reference to the __builtin_memcpy builtin function. 7935 else if (!BuiltinMemCpyRef) { 7936 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7937 LookupOrdinaryName); 7938 LookupName(R, TUScope, true); 7939 7940 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7941 if (!BuiltinMemCpy) { 7942 // Something went horribly wrong earlier, and we will have complained 7943 // about it. 7944 Invalid = true; 7945 continue; 7946 } 7947 7948 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7949 BuiltinMemCpy->getType(), 7950 VK_LValue, Loc, 0).take(); 7951 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7952 } 7953 7954 ASTOwningVector<Expr*> CallArgs(*this); 7955 CallArgs.push_back(To.takeAs<Expr>()); 7956 CallArgs.push_back(From.takeAs<Expr>()); 7957 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7958 ExprResult Call = ExprError(); 7959 if (NeedsCollectableMemCpy) 7960 Call = ActOnCallExpr(/*Scope=*/0, 7961 CollectableMemCpyRef, 7962 Loc, move_arg(CallArgs), 7963 Loc); 7964 else 7965 Call = ActOnCallExpr(/*Scope=*/0, 7966 BuiltinMemCpyRef, 7967 Loc, move_arg(CallArgs), 7968 Loc); 7969 7970 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7971 Statements.push_back(Call.takeAs<Expr>()); 7972 continue; 7973 } 7974 7975 // Build the move of this field. 7976 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 7977 To.get(), From.get(), 7978 /*CopyingBaseSubobject=*/false, 7979 /*Copying=*/false); 7980 if (Move.isInvalid()) { 7981 Diag(CurrentLocation, diag::note_member_synthesized_at) 7982 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 7983 MoveAssignOperator->setInvalidDecl(); 7984 return; 7985 } 7986 7987 // Success! Record the copy. 7988 Statements.push_back(Move.takeAs<Stmt>()); 7989 } 7990 7991 if (!Invalid) { 7992 // Add a "return *this;" 7993 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7994 7995 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7996 if (Return.isInvalid()) 7997 Invalid = true; 7998 else { 7999 Statements.push_back(Return.takeAs<Stmt>()); 8000 8001 if (Trap.hasErrorOccurred()) { 8002 Diag(CurrentLocation, diag::note_member_synthesized_at) 8003 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8004 Invalid = true; 8005 } 8006 } 8007 } 8008 8009 if (Invalid) { 8010 MoveAssignOperator->setInvalidDecl(); 8011 return; 8012 } 8013 8014 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8015 /*isStmtExpr=*/false); 8016 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8017 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8018 8019 if (ASTMutationListener *L = getASTMutationListener()) { 8020 L->CompletedImplicitDefinition(MoveAssignOperator); 8021 } 8022} 8023 8024std::pair<Sema::ImplicitExceptionSpecification, bool> 8025Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8026 if (ClassDecl->isInvalidDecl()) 8027 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8028 8029 // C++ [class.copy]p5: 8030 // The implicitly-declared copy constructor for a class X will 8031 // have the form 8032 // 8033 // X::X(const X&) 8034 // 8035 // if 8036 // FIXME: It ought to be possible to store this on the record. 8037 bool HasConstCopyConstructor = true; 8038 8039 // -- each direct or virtual base class B of X has a copy 8040 // constructor whose first parameter is of type const B& or 8041 // const volatile B&, and 8042 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8043 BaseEnd = ClassDecl->bases_end(); 8044 HasConstCopyConstructor && Base != BaseEnd; 8045 ++Base) { 8046 // Virtual bases are handled below. 8047 if (Base->isVirtual()) 8048 continue; 8049 8050 CXXRecordDecl *BaseClassDecl 8051 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8052 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8053 &HasConstCopyConstructor); 8054 } 8055 8056 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8057 BaseEnd = ClassDecl->vbases_end(); 8058 HasConstCopyConstructor && Base != BaseEnd; 8059 ++Base) { 8060 CXXRecordDecl *BaseClassDecl 8061 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8062 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8063 &HasConstCopyConstructor); 8064 } 8065 8066 // -- for all the nonstatic data members of X that are of a 8067 // class type M (or array thereof), each such class type 8068 // has a copy constructor whose first parameter is of type 8069 // const M& or const volatile M&. 8070 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8071 FieldEnd = ClassDecl->field_end(); 8072 HasConstCopyConstructor && Field != FieldEnd; 8073 ++Field) { 8074 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8075 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8076 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8077 &HasConstCopyConstructor); 8078 } 8079 } 8080 // Otherwise, the implicitly declared copy constructor will have 8081 // the form 8082 // 8083 // X::X(X&) 8084 8085 // C++ [except.spec]p14: 8086 // An implicitly declared special member function (Clause 12) shall have an 8087 // exception-specification. [...] 8088 ImplicitExceptionSpecification ExceptSpec(Context); 8089 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8090 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8091 BaseEnd = ClassDecl->bases_end(); 8092 Base != BaseEnd; 8093 ++Base) { 8094 // Virtual bases are handled below. 8095 if (Base->isVirtual()) 8096 continue; 8097 8098 CXXRecordDecl *BaseClassDecl 8099 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8100 if (CXXConstructorDecl *CopyConstructor = 8101 LookupCopyingConstructor(BaseClassDecl, Quals)) 8102 ExceptSpec.CalledDecl(CopyConstructor); 8103 } 8104 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8105 BaseEnd = ClassDecl->vbases_end(); 8106 Base != BaseEnd; 8107 ++Base) { 8108 CXXRecordDecl *BaseClassDecl 8109 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8110 if (CXXConstructorDecl *CopyConstructor = 8111 LookupCopyingConstructor(BaseClassDecl, Quals)) 8112 ExceptSpec.CalledDecl(CopyConstructor); 8113 } 8114 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8115 FieldEnd = ClassDecl->field_end(); 8116 Field != FieldEnd; 8117 ++Field) { 8118 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8119 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8120 if (CXXConstructorDecl *CopyConstructor = 8121 LookupCopyingConstructor(FieldClassDecl, Quals)) 8122 ExceptSpec.CalledDecl(CopyConstructor); 8123 } 8124 } 8125 8126 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8127} 8128 8129CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8130 CXXRecordDecl *ClassDecl) { 8131 // C++ [class.copy]p4: 8132 // If the class definition does not explicitly declare a copy 8133 // constructor, one is declared implicitly. 8134 8135 ImplicitExceptionSpecification Spec(Context); 8136 bool Const; 8137 llvm::tie(Spec, Const) = 8138 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8139 8140 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8141 QualType ArgType = ClassType; 8142 if (Const) 8143 ArgType = ArgType.withConst(); 8144 ArgType = Context.getLValueReferenceType(ArgType); 8145 8146 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8147 8148 DeclarationName Name 8149 = Context.DeclarationNames.getCXXConstructorName( 8150 Context.getCanonicalType(ClassType)); 8151 SourceLocation ClassLoc = ClassDecl->getLocation(); 8152 DeclarationNameInfo NameInfo(Name, ClassLoc); 8153 8154 // An implicitly-declared copy constructor is an inline public 8155 // member of its class. 8156 CXXConstructorDecl *CopyConstructor 8157 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8158 Context.getFunctionType(Context.VoidTy, 8159 &ArgType, 1, EPI), 8160 /*TInfo=*/0, 8161 /*isExplicit=*/false, 8162 /*isInline=*/true, 8163 /*isImplicitlyDeclared=*/true, 8164 // FIXME: apply the rules for definitions here 8165 /*isConstexpr=*/false); 8166 CopyConstructor->setAccess(AS_public); 8167 CopyConstructor->setDefaulted(); 8168 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8169 8170 // Note that we have declared this constructor. 8171 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8172 8173 // Add the parameter to the constructor. 8174 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8175 ClassLoc, ClassLoc, 8176 /*IdentifierInfo=*/0, 8177 ArgType, /*TInfo=*/0, 8178 SC_None, 8179 SC_None, 0); 8180 CopyConstructor->setParams(&FromParam, 1); 8181 8182 if (Scope *S = getScopeForContext(ClassDecl)) 8183 PushOnScopeChains(CopyConstructor, S, false); 8184 ClassDecl->addDecl(CopyConstructor); 8185 8186 // C++0x [class.copy]p7: 8187 // ... If the class definition declares a move constructor or move 8188 // assignment operator, the implicitly declared constructor is defined as 8189 // deleted; ... 8190 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8191 ClassDecl->hasUserDeclaredMoveAssignment() || 8192 ShouldDeleteCopyConstructor(CopyConstructor)) 8193 CopyConstructor->setDeletedAsWritten(); 8194 8195 return CopyConstructor; 8196} 8197 8198void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8199 CXXConstructorDecl *CopyConstructor) { 8200 assert((CopyConstructor->isDefaulted() && 8201 CopyConstructor->isCopyConstructor() && 8202 !CopyConstructor->doesThisDeclarationHaveABody()) && 8203 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8204 8205 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8206 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8207 8208 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8209 DiagnosticErrorTrap Trap(Diags); 8210 8211 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8212 Trap.hasErrorOccurred()) { 8213 Diag(CurrentLocation, diag::note_member_synthesized_at) 8214 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8215 CopyConstructor->setInvalidDecl(); 8216 } else { 8217 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8218 CopyConstructor->getLocation(), 8219 MultiStmtArg(*this, 0, 0), 8220 /*isStmtExpr=*/false) 8221 .takeAs<Stmt>()); 8222 } 8223 8224 CopyConstructor->setUsed(); 8225 8226 if (ASTMutationListener *L = getASTMutationListener()) { 8227 L->CompletedImplicitDefinition(CopyConstructor); 8228 } 8229} 8230 8231Sema::ImplicitExceptionSpecification 8232Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8233 // C++ [except.spec]p14: 8234 // An implicitly declared special member function (Clause 12) shall have an 8235 // exception-specification. [...] 8236 ImplicitExceptionSpecification ExceptSpec(Context); 8237 if (ClassDecl->isInvalidDecl()) 8238 return ExceptSpec; 8239 8240 // Direct base-class constructors. 8241 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8242 BEnd = ClassDecl->bases_end(); 8243 B != BEnd; ++B) { 8244 if (B->isVirtual()) // Handled below. 8245 continue; 8246 8247 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8248 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8249 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8250 // If this is a deleted function, add it anyway. This might be conformant 8251 // with the standard. This might not. I'm not sure. It might not matter. 8252 if (Constructor) 8253 ExceptSpec.CalledDecl(Constructor); 8254 } 8255 } 8256 8257 // Virtual base-class constructors. 8258 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8259 BEnd = ClassDecl->vbases_end(); 8260 B != BEnd; ++B) { 8261 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8262 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8263 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8264 // If this is a deleted function, add it anyway. This might be conformant 8265 // with the standard. This might not. I'm not sure. It might not matter. 8266 if (Constructor) 8267 ExceptSpec.CalledDecl(Constructor); 8268 } 8269 } 8270 8271 // Field constructors. 8272 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8273 FEnd = ClassDecl->field_end(); 8274 F != FEnd; ++F) { 8275 if (F->hasInClassInitializer()) { 8276 if (Expr *E = F->getInClassInitializer()) 8277 ExceptSpec.CalledExpr(E); 8278 else if (!F->isInvalidDecl()) 8279 ExceptSpec.SetDelayed(); 8280 } else if (const RecordType *RecordTy 8281 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8282 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8283 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8284 // If this is a deleted function, add it anyway. This might be conformant 8285 // with the standard. This might not. I'm not sure. It might not matter. 8286 // In particular, the problem is that this function never gets called. It 8287 // might just be ill-formed because this function attempts to refer to 8288 // a deleted function here. 8289 if (Constructor) 8290 ExceptSpec.CalledDecl(Constructor); 8291 } 8292 } 8293 8294 return ExceptSpec; 8295} 8296 8297CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8298 CXXRecordDecl *ClassDecl) { 8299 ImplicitExceptionSpecification Spec( 8300 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8301 8302 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8303 QualType ArgType = Context.getRValueReferenceType(ClassType); 8304 8305 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8306 8307 DeclarationName Name 8308 = Context.DeclarationNames.getCXXConstructorName( 8309 Context.getCanonicalType(ClassType)); 8310 SourceLocation ClassLoc = ClassDecl->getLocation(); 8311 DeclarationNameInfo NameInfo(Name, ClassLoc); 8312 8313 // C++0x [class.copy]p11: 8314 // An implicitly-declared copy/move constructor is an inline public 8315 // member of its class. 8316 CXXConstructorDecl *MoveConstructor 8317 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8318 Context.getFunctionType(Context.VoidTy, 8319 &ArgType, 1, EPI), 8320 /*TInfo=*/0, 8321 /*isExplicit=*/false, 8322 /*isInline=*/true, 8323 /*isImplicitlyDeclared=*/true, 8324 // FIXME: apply the rules for definitions here 8325 /*isConstexpr=*/false); 8326 MoveConstructor->setAccess(AS_public); 8327 MoveConstructor->setDefaulted(); 8328 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8329 8330 // Add the parameter to the constructor. 8331 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8332 ClassLoc, ClassLoc, 8333 /*IdentifierInfo=*/0, 8334 ArgType, /*TInfo=*/0, 8335 SC_None, 8336 SC_None, 0); 8337 MoveConstructor->setParams(&FromParam, 1); 8338 8339 // C++0x [class.copy]p9: 8340 // If the definition of a class X does not explicitly declare a move 8341 // constructor, one will be implicitly declared as defaulted if and only if: 8342 // [...] 8343 // - the move constructor would not be implicitly defined as deleted. 8344 if (ShouldDeleteMoveConstructor(MoveConstructor)) { 8345 // Cache this result so that we don't try to generate this over and over 8346 // on every lookup, leaking memory and wasting time. 8347 ClassDecl->setFailedImplicitMoveConstructor(); 8348 return 0; 8349 } 8350 8351 // Note that we have declared this constructor. 8352 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8353 8354 if (Scope *S = getScopeForContext(ClassDecl)) 8355 PushOnScopeChains(MoveConstructor, S, false); 8356 ClassDecl->addDecl(MoveConstructor); 8357 8358 return MoveConstructor; 8359} 8360 8361void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8362 CXXConstructorDecl *MoveConstructor) { 8363 assert((MoveConstructor->isDefaulted() && 8364 MoveConstructor->isMoveConstructor() && 8365 !MoveConstructor->doesThisDeclarationHaveABody()) && 8366 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8367 8368 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8369 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8370 8371 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8372 DiagnosticErrorTrap Trap(Diags); 8373 8374 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8375 Trap.hasErrorOccurred()) { 8376 Diag(CurrentLocation, diag::note_member_synthesized_at) 8377 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8378 MoveConstructor->setInvalidDecl(); 8379 } else { 8380 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8381 MoveConstructor->getLocation(), 8382 MultiStmtArg(*this, 0, 0), 8383 /*isStmtExpr=*/false) 8384 .takeAs<Stmt>()); 8385 } 8386 8387 MoveConstructor->setUsed(); 8388 8389 if (ASTMutationListener *L = getASTMutationListener()) { 8390 L->CompletedImplicitDefinition(MoveConstructor); 8391 } 8392} 8393 8394ExprResult 8395Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8396 CXXConstructorDecl *Constructor, 8397 MultiExprArg ExprArgs, 8398 bool RequiresZeroInit, 8399 unsigned ConstructKind, 8400 SourceRange ParenRange) { 8401 bool Elidable = false; 8402 8403 // C++0x [class.copy]p34: 8404 // When certain criteria are met, an implementation is allowed to 8405 // omit the copy/move construction of a class object, even if the 8406 // copy/move constructor and/or destructor for the object have 8407 // side effects. [...] 8408 // - when a temporary class object that has not been bound to a 8409 // reference (12.2) would be copied/moved to a class object 8410 // with the same cv-unqualified type, the copy/move operation 8411 // can be omitted by constructing the temporary object 8412 // directly into the target of the omitted copy/move 8413 if (ConstructKind == CXXConstructExpr::CK_Complete && 8414 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8415 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8416 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8417 } 8418 8419 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8420 Elidable, move(ExprArgs), RequiresZeroInit, 8421 ConstructKind, ParenRange); 8422} 8423 8424/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8425/// including handling of its default argument expressions. 8426ExprResult 8427Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8428 CXXConstructorDecl *Constructor, bool Elidable, 8429 MultiExprArg ExprArgs, 8430 bool RequiresZeroInit, 8431 unsigned ConstructKind, 8432 SourceRange ParenRange) { 8433 unsigned NumExprs = ExprArgs.size(); 8434 Expr **Exprs = (Expr **)ExprArgs.release(); 8435 8436 for (specific_attr_iterator<NonNullAttr> 8437 i = Constructor->specific_attr_begin<NonNullAttr>(), 8438 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8439 const NonNullAttr *NonNull = *i; 8440 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8441 } 8442 8443 MarkDeclarationReferenced(ConstructLoc, Constructor); 8444 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8445 Constructor, Elidable, Exprs, NumExprs, 8446 RequiresZeroInit, 8447 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8448 ParenRange)); 8449} 8450 8451bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8452 CXXConstructorDecl *Constructor, 8453 MultiExprArg Exprs) { 8454 // FIXME: Provide the correct paren SourceRange when available. 8455 ExprResult TempResult = 8456 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8457 move(Exprs), false, CXXConstructExpr::CK_Complete, 8458 SourceRange()); 8459 if (TempResult.isInvalid()) 8460 return true; 8461 8462 Expr *Temp = TempResult.takeAs<Expr>(); 8463 CheckImplicitConversions(Temp, VD->getLocation()); 8464 MarkDeclarationReferenced(VD->getLocation(), Constructor); 8465 Temp = MaybeCreateExprWithCleanups(Temp); 8466 VD->setInit(Temp); 8467 8468 return false; 8469} 8470 8471void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8472 if (VD->isInvalidDecl()) return; 8473 8474 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8475 if (ClassDecl->isInvalidDecl()) return; 8476 if (ClassDecl->hasTrivialDestructor()) return; 8477 if (ClassDecl->isDependentContext()) return; 8478 8479 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 8480 MarkDeclarationReferenced(VD->getLocation(), Destructor); 8481 CheckDestructorAccess(VD->getLocation(), Destructor, 8482 PDiag(diag::err_access_dtor_var) 8483 << VD->getDeclName() 8484 << VD->getType()); 8485 8486 if (!VD->hasGlobalStorage()) return; 8487 8488 // Emit warning for non-trivial dtor in global scope (a real global, 8489 // class-static, function-static). 8490 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 8491 8492 // TODO: this should be re-enabled for static locals by !CXAAtExit 8493 if (!VD->isStaticLocal()) 8494 Diag(VD->getLocation(), diag::warn_global_destructor); 8495} 8496 8497/// AddCXXDirectInitializerToDecl - This action is called immediately after 8498/// ActOnDeclarator, when a C++ direct initializer is present. 8499/// e.g: "int x(1);" 8500void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 8501 SourceLocation LParenLoc, 8502 MultiExprArg Exprs, 8503 SourceLocation RParenLoc, 8504 bool TypeMayContainAuto) { 8505 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 8506 8507 // If there is no declaration, there was an error parsing it. Just ignore 8508 // the initializer. 8509 if (RealDecl == 0) 8510 return; 8511 8512 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 8513 if (!VDecl) { 8514 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 8515 RealDecl->setInvalidDecl(); 8516 return; 8517 } 8518 8519 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 8520 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 8521 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 8522 if (Exprs.size() > 1) { 8523 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 8524 diag::err_auto_var_init_multiple_expressions) 8525 << VDecl->getDeclName() << VDecl->getType() 8526 << VDecl->getSourceRange(); 8527 RealDecl->setInvalidDecl(); 8528 return; 8529 } 8530 8531 Expr *Init = Exprs.get()[0]; 8532 TypeSourceInfo *DeducedType = 0; 8533 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 8534 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 8535 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 8536 << Init->getSourceRange(); 8537 if (!DeducedType) { 8538 RealDecl->setInvalidDecl(); 8539 return; 8540 } 8541 VDecl->setTypeSourceInfo(DeducedType); 8542 VDecl->setType(DeducedType->getType()); 8543 8544 // In ARC, infer lifetime. 8545 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 8546 VDecl->setInvalidDecl(); 8547 8548 // If this is a redeclaration, check that the type we just deduced matches 8549 // the previously declared type. 8550 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 8551 MergeVarDeclTypes(VDecl, Old); 8552 } 8553 8554 // We will represent direct-initialization similarly to copy-initialization: 8555 // int x(1); -as-> int x = 1; 8556 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 8557 // 8558 // Clients that want to distinguish between the two forms, can check for 8559 // direct initializer using VarDecl::hasCXXDirectInitializer(). 8560 // A major benefit is that clients that don't particularly care about which 8561 // exactly form was it (like the CodeGen) can handle both cases without 8562 // special case code. 8563 8564 // C++ 8.5p11: 8565 // The form of initialization (using parentheses or '=') is generally 8566 // insignificant, but does matter when the entity being initialized has a 8567 // class type. 8568 8569 if (!VDecl->getType()->isDependentType() && 8570 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 8571 diag::err_typecheck_decl_incomplete_type)) { 8572 VDecl->setInvalidDecl(); 8573 return; 8574 } 8575 8576 // The variable can not have an abstract class type. 8577 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 8578 diag::err_abstract_type_in_decl, 8579 AbstractVariableType)) 8580 VDecl->setInvalidDecl(); 8581 8582 const VarDecl *Def; 8583 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 8584 Diag(VDecl->getLocation(), diag::err_redefinition) 8585 << VDecl->getDeclName(); 8586 Diag(Def->getLocation(), diag::note_previous_definition); 8587 VDecl->setInvalidDecl(); 8588 return; 8589 } 8590 8591 // C++ [class.static.data]p4 8592 // If a static data member is of const integral or const 8593 // enumeration type, its declaration in the class definition can 8594 // specify a constant-initializer which shall be an integral 8595 // constant expression (5.19). In that case, the member can appear 8596 // in integral constant expressions. The member shall still be 8597 // defined in a namespace scope if it is used in the program and the 8598 // namespace scope definition shall not contain an initializer. 8599 // 8600 // We already performed a redefinition check above, but for static 8601 // data members we also need to check whether there was an in-class 8602 // declaration with an initializer. 8603 const VarDecl* PrevInit = 0; 8604 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 8605 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 8606 Diag(PrevInit->getLocation(), diag::note_previous_definition); 8607 return; 8608 } 8609 8610 bool IsDependent = false; 8611 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 8612 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 8613 VDecl->setInvalidDecl(); 8614 return; 8615 } 8616 8617 if (Exprs.get()[I]->isTypeDependent()) 8618 IsDependent = true; 8619 } 8620 8621 // If either the declaration has a dependent type or if any of the 8622 // expressions is type-dependent, we represent the initialization 8623 // via a ParenListExpr for later use during template instantiation. 8624 if (VDecl->getType()->isDependentType() || IsDependent) { 8625 // Let clients know that initialization was done with a direct initializer. 8626 VDecl->setCXXDirectInitializer(true); 8627 8628 // Store the initialization expressions as a ParenListExpr. 8629 unsigned NumExprs = Exprs.size(); 8630 VDecl->setInit(new (Context) ParenListExpr( 8631 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 8632 VDecl->getType().getNonReferenceType())); 8633 return; 8634 } 8635 8636 // Capture the variable that is being initialized and the style of 8637 // initialization. 8638 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 8639 8640 // FIXME: Poor source location information. 8641 InitializationKind Kind 8642 = InitializationKind::CreateDirect(VDecl->getLocation(), 8643 LParenLoc, RParenLoc); 8644 8645 InitializationSequence InitSeq(*this, Entity, Kind, 8646 Exprs.get(), Exprs.size()); 8647 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 8648 if (Result.isInvalid()) { 8649 VDecl->setInvalidDecl(); 8650 return; 8651 } 8652 8653 CheckImplicitConversions(Result.get(), LParenLoc); 8654 8655 Result = MaybeCreateExprWithCleanups(Result); 8656 VDecl->setInit(Result.takeAs<Expr>()); 8657 VDecl->setCXXDirectInitializer(true); 8658 8659 CheckCompleteVariableDeclaration(VDecl); 8660} 8661 8662/// \brief Given a constructor and the set of arguments provided for the 8663/// constructor, convert the arguments and add any required default arguments 8664/// to form a proper call to this constructor. 8665/// 8666/// \returns true if an error occurred, false otherwise. 8667bool 8668Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 8669 MultiExprArg ArgsPtr, 8670 SourceLocation Loc, 8671 ASTOwningVector<Expr*> &ConvertedArgs) { 8672 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 8673 unsigned NumArgs = ArgsPtr.size(); 8674 Expr **Args = (Expr **)ArgsPtr.get(); 8675 8676 const FunctionProtoType *Proto 8677 = Constructor->getType()->getAs<FunctionProtoType>(); 8678 assert(Proto && "Constructor without a prototype?"); 8679 unsigned NumArgsInProto = Proto->getNumArgs(); 8680 8681 // If too few arguments are available, we'll fill in the rest with defaults. 8682 if (NumArgs < NumArgsInProto) 8683 ConvertedArgs.reserve(NumArgsInProto); 8684 else 8685 ConvertedArgs.reserve(NumArgs); 8686 8687 VariadicCallType CallType = 8688 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 8689 SmallVector<Expr *, 8> AllArgs; 8690 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 8691 Proto, 0, Args, NumArgs, AllArgs, 8692 CallType); 8693 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 8694 ConvertedArgs.push_back(AllArgs[i]); 8695 return Invalid; 8696} 8697 8698static inline bool 8699CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 8700 const FunctionDecl *FnDecl) { 8701 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 8702 if (isa<NamespaceDecl>(DC)) { 8703 return SemaRef.Diag(FnDecl->getLocation(), 8704 diag::err_operator_new_delete_declared_in_namespace) 8705 << FnDecl->getDeclName(); 8706 } 8707 8708 if (isa<TranslationUnitDecl>(DC) && 8709 FnDecl->getStorageClass() == SC_Static) { 8710 return SemaRef.Diag(FnDecl->getLocation(), 8711 diag::err_operator_new_delete_declared_static) 8712 << FnDecl->getDeclName(); 8713 } 8714 8715 return false; 8716} 8717 8718static inline bool 8719CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 8720 CanQualType ExpectedResultType, 8721 CanQualType ExpectedFirstParamType, 8722 unsigned DependentParamTypeDiag, 8723 unsigned InvalidParamTypeDiag) { 8724 QualType ResultType = 8725 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 8726 8727 // Check that the result type is not dependent. 8728 if (ResultType->isDependentType()) 8729 return SemaRef.Diag(FnDecl->getLocation(), 8730 diag::err_operator_new_delete_dependent_result_type) 8731 << FnDecl->getDeclName() << ExpectedResultType; 8732 8733 // Check that the result type is what we expect. 8734 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 8735 return SemaRef.Diag(FnDecl->getLocation(), 8736 diag::err_operator_new_delete_invalid_result_type) 8737 << FnDecl->getDeclName() << ExpectedResultType; 8738 8739 // A function template must have at least 2 parameters. 8740 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 8741 return SemaRef.Diag(FnDecl->getLocation(), 8742 diag::err_operator_new_delete_template_too_few_parameters) 8743 << FnDecl->getDeclName(); 8744 8745 // The function decl must have at least 1 parameter. 8746 if (FnDecl->getNumParams() == 0) 8747 return SemaRef.Diag(FnDecl->getLocation(), 8748 diag::err_operator_new_delete_too_few_parameters) 8749 << FnDecl->getDeclName(); 8750 8751 // Check the the first parameter type is not dependent. 8752 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 8753 if (FirstParamType->isDependentType()) 8754 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 8755 << FnDecl->getDeclName() << ExpectedFirstParamType; 8756 8757 // Check that the first parameter type is what we expect. 8758 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 8759 ExpectedFirstParamType) 8760 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 8761 << FnDecl->getDeclName() << ExpectedFirstParamType; 8762 8763 return false; 8764} 8765 8766static bool 8767CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 8768 // C++ [basic.stc.dynamic.allocation]p1: 8769 // A program is ill-formed if an allocation function is declared in a 8770 // namespace scope other than global scope or declared static in global 8771 // scope. 8772 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 8773 return true; 8774 8775 CanQualType SizeTy = 8776 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 8777 8778 // C++ [basic.stc.dynamic.allocation]p1: 8779 // The return type shall be void*. The first parameter shall have type 8780 // std::size_t. 8781 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 8782 SizeTy, 8783 diag::err_operator_new_dependent_param_type, 8784 diag::err_operator_new_param_type)) 8785 return true; 8786 8787 // C++ [basic.stc.dynamic.allocation]p1: 8788 // The first parameter shall not have an associated default argument. 8789 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 8790 return SemaRef.Diag(FnDecl->getLocation(), 8791 diag::err_operator_new_default_arg) 8792 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 8793 8794 return false; 8795} 8796 8797static bool 8798CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 8799 // C++ [basic.stc.dynamic.deallocation]p1: 8800 // A program is ill-formed if deallocation functions are declared in a 8801 // namespace scope other than global scope or declared static in global 8802 // scope. 8803 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 8804 return true; 8805 8806 // C++ [basic.stc.dynamic.deallocation]p2: 8807 // Each deallocation function shall return void and its first parameter 8808 // shall be void*. 8809 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 8810 SemaRef.Context.VoidPtrTy, 8811 diag::err_operator_delete_dependent_param_type, 8812 diag::err_operator_delete_param_type)) 8813 return true; 8814 8815 return false; 8816} 8817 8818/// CheckOverloadedOperatorDeclaration - Check whether the declaration 8819/// of this overloaded operator is well-formed. If so, returns false; 8820/// otherwise, emits appropriate diagnostics and returns true. 8821bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 8822 assert(FnDecl && FnDecl->isOverloadedOperator() && 8823 "Expected an overloaded operator declaration"); 8824 8825 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 8826 8827 // C++ [over.oper]p5: 8828 // The allocation and deallocation functions, operator new, 8829 // operator new[], operator delete and operator delete[], are 8830 // described completely in 3.7.3. The attributes and restrictions 8831 // found in the rest of this subclause do not apply to them unless 8832 // explicitly stated in 3.7.3. 8833 if (Op == OO_Delete || Op == OO_Array_Delete) 8834 return CheckOperatorDeleteDeclaration(*this, FnDecl); 8835 8836 if (Op == OO_New || Op == OO_Array_New) 8837 return CheckOperatorNewDeclaration(*this, FnDecl); 8838 8839 // C++ [over.oper]p6: 8840 // An operator function shall either be a non-static member 8841 // function or be a non-member function and have at least one 8842 // parameter whose type is a class, a reference to a class, an 8843 // enumeration, or a reference to an enumeration. 8844 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 8845 if (MethodDecl->isStatic()) 8846 return Diag(FnDecl->getLocation(), 8847 diag::err_operator_overload_static) << FnDecl->getDeclName(); 8848 } else { 8849 bool ClassOrEnumParam = false; 8850 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 8851 ParamEnd = FnDecl->param_end(); 8852 Param != ParamEnd; ++Param) { 8853 QualType ParamType = (*Param)->getType().getNonReferenceType(); 8854 if (ParamType->isDependentType() || ParamType->isRecordType() || 8855 ParamType->isEnumeralType()) { 8856 ClassOrEnumParam = true; 8857 break; 8858 } 8859 } 8860 8861 if (!ClassOrEnumParam) 8862 return Diag(FnDecl->getLocation(), 8863 diag::err_operator_overload_needs_class_or_enum) 8864 << FnDecl->getDeclName(); 8865 } 8866 8867 // C++ [over.oper]p8: 8868 // An operator function cannot have default arguments (8.3.6), 8869 // except where explicitly stated below. 8870 // 8871 // Only the function-call operator allows default arguments 8872 // (C++ [over.call]p1). 8873 if (Op != OO_Call) { 8874 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 8875 Param != FnDecl->param_end(); ++Param) { 8876 if ((*Param)->hasDefaultArg()) 8877 return Diag((*Param)->getLocation(), 8878 diag::err_operator_overload_default_arg) 8879 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 8880 } 8881 } 8882 8883 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 8884 { false, false, false } 8885#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 8886 , { Unary, Binary, MemberOnly } 8887#include "clang/Basic/OperatorKinds.def" 8888 }; 8889 8890 bool CanBeUnaryOperator = OperatorUses[Op][0]; 8891 bool CanBeBinaryOperator = OperatorUses[Op][1]; 8892 bool MustBeMemberOperator = OperatorUses[Op][2]; 8893 8894 // C++ [over.oper]p8: 8895 // [...] Operator functions cannot have more or fewer parameters 8896 // than the number required for the corresponding operator, as 8897 // described in the rest of this subclause. 8898 unsigned NumParams = FnDecl->getNumParams() 8899 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 8900 if (Op != OO_Call && 8901 ((NumParams == 1 && !CanBeUnaryOperator) || 8902 (NumParams == 2 && !CanBeBinaryOperator) || 8903 (NumParams < 1) || (NumParams > 2))) { 8904 // We have the wrong number of parameters. 8905 unsigned ErrorKind; 8906 if (CanBeUnaryOperator && CanBeBinaryOperator) { 8907 ErrorKind = 2; // 2 -> unary or binary. 8908 } else if (CanBeUnaryOperator) { 8909 ErrorKind = 0; // 0 -> unary 8910 } else { 8911 assert(CanBeBinaryOperator && 8912 "All non-call overloaded operators are unary or binary!"); 8913 ErrorKind = 1; // 1 -> binary 8914 } 8915 8916 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 8917 << FnDecl->getDeclName() << NumParams << ErrorKind; 8918 } 8919 8920 // Overloaded operators other than operator() cannot be variadic. 8921 if (Op != OO_Call && 8922 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 8923 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 8924 << FnDecl->getDeclName(); 8925 } 8926 8927 // Some operators must be non-static member functions. 8928 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 8929 return Diag(FnDecl->getLocation(), 8930 diag::err_operator_overload_must_be_member) 8931 << FnDecl->getDeclName(); 8932 } 8933 8934 // C++ [over.inc]p1: 8935 // The user-defined function called operator++ implements the 8936 // prefix and postfix ++ operator. If this function is a member 8937 // function with no parameters, or a non-member function with one 8938 // parameter of class or enumeration type, it defines the prefix 8939 // increment operator ++ for objects of that type. If the function 8940 // is a member function with one parameter (which shall be of type 8941 // int) or a non-member function with two parameters (the second 8942 // of which shall be of type int), it defines the postfix 8943 // increment operator ++ for objects of that type. 8944 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 8945 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 8946 bool ParamIsInt = false; 8947 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 8948 ParamIsInt = BT->getKind() == BuiltinType::Int; 8949 8950 if (!ParamIsInt) 8951 return Diag(LastParam->getLocation(), 8952 diag::err_operator_overload_post_incdec_must_be_int) 8953 << LastParam->getType() << (Op == OO_MinusMinus); 8954 } 8955 8956 return false; 8957} 8958 8959/// CheckLiteralOperatorDeclaration - Check whether the declaration 8960/// of this literal operator function is well-formed. If so, returns 8961/// false; otherwise, emits appropriate diagnostics and returns true. 8962bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 8963 DeclContext *DC = FnDecl->getDeclContext(); 8964 Decl::Kind Kind = DC->getDeclKind(); 8965 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 8966 Kind != Decl::LinkageSpec) { 8967 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 8968 << FnDecl->getDeclName(); 8969 return true; 8970 } 8971 8972 bool Valid = false; 8973 8974 // template <char...> type operator "" name() is the only valid template 8975 // signature, and the only valid signature with no parameters. 8976 if (FnDecl->param_size() == 0) { 8977 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 8978 // Must have only one template parameter 8979 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 8980 if (Params->size() == 1) { 8981 NonTypeTemplateParmDecl *PmDecl = 8982 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 8983 8984 // The template parameter must be a char parameter pack. 8985 if (PmDecl && PmDecl->isTemplateParameterPack() && 8986 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 8987 Valid = true; 8988 } 8989 } 8990 } else { 8991 // Check the first parameter 8992 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 8993 8994 QualType T = (*Param)->getType(); 8995 8996 // unsigned long long int, long double, and any character type are allowed 8997 // as the only parameters. 8998 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 8999 Context.hasSameType(T, Context.LongDoubleTy) || 9000 Context.hasSameType(T, Context.CharTy) || 9001 Context.hasSameType(T, Context.WCharTy) || 9002 Context.hasSameType(T, Context.Char16Ty) || 9003 Context.hasSameType(T, Context.Char32Ty)) { 9004 if (++Param == FnDecl->param_end()) 9005 Valid = true; 9006 goto FinishedParams; 9007 } 9008 9009 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9010 const PointerType *PT = T->getAs<PointerType>(); 9011 if (!PT) 9012 goto FinishedParams; 9013 T = PT->getPointeeType(); 9014 if (!T.isConstQualified()) 9015 goto FinishedParams; 9016 T = T.getUnqualifiedType(); 9017 9018 // Move on to the second parameter; 9019 ++Param; 9020 9021 // If there is no second parameter, the first must be a const char * 9022 if (Param == FnDecl->param_end()) { 9023 if (Context.hasSameType(T, Context.CharTy)) 9024 Valid = true; 9025 goto FinishedParams; 9026 } 9027 9028 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9029 // are allowed as the first parameter to a two-parameter function 9030 if (!(Context.hasSameType(T, Context.CharTy) || 9031 Context.hasSameType(T, Context.WCharTy) || 9032 Context.hasSameType(T, Context.Char16Ty) || 9033 Context.hasSameType(T, Context.Char32Ty))) 9034 goto FinishedParams; 9035 9036 // The second and final parameter must be an std::size_t 9037 T = (*Param)->getType().getUnqualifiedType(); 9038 if (Context.hasSameType(T, Context.getSizeType()) && 9039 ++Param == FnDecl->param_end()) 9040 Valid = true; 9041 } 9042 9043 // FIXME: This diagnostic is absolutely terrible. 9044FinishedParams: 9045 if (!Valid) { 9046 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9047 << FnDecl->getDeclName(); 9048 return true; 9049 } 9050 9051 return false; 9052} 9053 9054/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9055/// linkage specification, including the language and (if present) 9056/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9057/// the location of the language string literal, which is provided 9058/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9059/// the '{' brace. Otherwise, this linkage specification does not 9060/// have any braces. 9061Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9062 SourceLocation LangLoc, 9063 StringRef Lang, 9064 SourceLocation LBraceLoc) { 9065 LinkageSpecDecl::LanguageIDs Language; 9066 if (Lang == "\"C\"") 9067 Language = LinkageSpecDecl::lang_c; 9068 else if (Lang == "\"C++\"") 9069 Language = LinkageSpecDecl::lang_cxx; 9070 else { 9071 Diag(LangLoc, diag::err_bad_language); 9072 return 0; 9073 } 9074 9075 // FIXME: Add all the various semantics of linkage specifications 9076 9077 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9078 ExternLoc, LangLoc, Language); 9079 CurContext->addDecl(D); 9080 PushDeclContext(S, D); 9081 return D; 9082} 9083 9084/// ActOnFinishLinkageSpecification - Complete the definition of 9085/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9086/// valid, it's the position of the closing '}' brace in a linkage 9087/// specification that uses braces. 9088Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9089 Decl *LinkageSpec, 9090 SourceLocation RBraceLoc) { 9091 if (LinkageSpec) { 9092 if (RBraceLoc.isValid()) { 9093 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9094 LSDecl->setRBraceLoc(RBraceLoc); 9095 } 9096 PopDeclContext(); 9097 } 9098 return LinkageSpec; 9099} 9100 9101/// \brief Perform semantic analysis for the variable declaration that 9102/// occurs within a C++ catch clause, returning the newly-created 9103/// variable. 9104VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9105 TypeSourceInfo *TInfo, 9106 SourceLocation StartLoc, 9107 SourceLocation Loc, 9108 IdentifierInfo *Name) { 9109 bool Invalid = false; 9110 QualType ExDeclType = TInfo->getType(); 9111 9112 // Arrays and functions decay. 9113 if (ExDeclType->isArrayType()) 9114 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9115 else if (ExDeclType->isFunctionType()) 9116 ExDeclType = Context.getPointerType(ExDeclType); 9117 9118 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9119 // The exception-declaration shall not denote a pointer or reference to an 9120 // incomplete type, other than [cv] void*. 9121 // N2844 forbids rvalue references. 9122 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9123 Diag(Loc, diag::err_catch_rvalue_ref); 9124 Invalid = true; 9125 } 9126 9127 // GCC allows catching pointers and references to incomplete types 9128 // as an extension; so do we, but we warn by default. 9129 9130 QualType BaseType = ExDeclType; 9131 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9132 unsigned DK = diag::err_catch_incomplete; 9133 bool IncompleteCatchIsInvalid = true; 9134 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9135 BaseType = Ptr->getPointeeType(); 9136 Mode = 1; 9137 DK = diag::ext_catch_incomplete_ptr; 9138 IncompleteCatchIsInvalid = false; 9139 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9140 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9141 BaseType = Ref->getPointeeType(); 9142 Mode = 2; 9143 DK = diag::ext_catch_incomplete_ref; 9144 IncompleteCatchIsInvalid = false; 9145 } 9146 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9147 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9148 IncompleteCatchIsInvalid) 9149 Invalid = true; 9150 9151 if (!Invalid && !ExDeclType->isDependentType() && 9152 RequireNonAbstractType(Loc, ExDeclType, 9153 diag::err_abstract_type_in_decl, 9154 AbstractVariableType)) 9155 Invalid = true; 9156 9157 // Only the non-fragile NeXT runtime currently supports C++ catches 9158 // of ObjC types, and no runtime supports catching ObjC types by value. 9159 if (!Invalid && getLangOptions().ObjC1) { 9160 QualType T = ExDeclType; 9161 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9162 T = RT->getPointeeType(); 9163 9164 if (T->isObjCObjectType()) { 9165 Diag(Loc, diag::err_objc_object_catch); 9166 Invalid = true; 9167 } else if (T->isObjCObjectPointerType()) { 9168 if (!getLangOptions().ObjCNonFragileABI) 9169 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9170 } 9171 } 9172 9173 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9174 ExDeclType, TInfo, SC_None, SC_None); 9175 ExDecl->setExceptionVariable(true); 9176 9177 if (!Invalid && !ExDeclType->isDependentType()) { 9178 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9179 // C++ [except.handle]p16: 9180 // The object declared in an exception-declaration or, if the 9181 // exception-declaration does not specify a name, a temporary (12.2) is 9182 // copy-initialized (8.5) from the exception object. [...] 9183 // The object is destroyed when the handler exits, after the destruction 9184 // of any automatic objects initialized within the handler. 9185 // 9186 // We just pretend to initialize the object with itself, then make sure 9187 // it can be destroyed later. 9188 QualType initType = ExDeclType; 9189 9190 InitializedEntity entity = 9191 InitializedEntity::InitializeVariable(ExDecl); 9192 InitializationKind initKind = 9193 InitializationKind::CreateCopy(Loc, SourceLocation()); 9194 9195 Expr *opaqueValue = 9196 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9197 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9198 ExprResult result = sequence.Perform(*this, entity, initKind, 9199 MultiExprArg(&opaqueValue, 1)); 9200 if (result.isInvalid()) 9201 Invalid = true; 9202 else { 9203 // If the constructor used was non-trivial, set this as the 9204 // "initializer". 9205 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9206 if (!construct->getConstructor()->isTrivial()) { 9207 Expr *init = MaybeCreateExprWithCleanups(construct); 9208 ExDecl->setInit(init); 9209 } 9210 9211 // And make sure it's destructable. 9212 FinalizeVarWithDestructor(ExDecl, recordType); 9213 } 9214 } 9215 } 9216 9217 if (Invalid) 9218 ExDecl->setInvalidDecl(); 9219 9220 return ExDecl; 9221} 9222 9223/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9224/// handler. 9225Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9226 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9227 bool Invalid = D.isInvalidType(); 9228 9229 // Check for unexpanded parameter packs. 9230 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9231 UPPC_ExceptionType)) { 9232 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9233 D.getIdentifierLoc()); 9234 Invalid = true; 9235 } 9236 9237 IdentifierInfo *II = D.getIdentifier(); 9238 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9239 LookupOrdinaryName, 9240 ForRedeclaration)) { 9241 // The scope should be freshly made just for us. There is just no way 9242 // it contains any previous declaration. 9243 assert(!S->isDeclScope(PrevDecl)); 9244 if (PrevDecl->isTemplateParameter()) { 9245 // Maybe we will complain about the shadowed template parameter. 9246 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9247 } 9248 } 9249 9250 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9251 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9252 << D.getCXXScopeSpec().getRange(); 9253 Invalid = true; 9254 } 9255 9256 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9257 D.getSourceRange().getBegin(), 9258 D.getIdentifierLoc(), 9259 D.getIdentifier()); 9260 if (Invalid) 9261 ExDecl->setInvalidDecl(); 9262 9263 // Add the exception declaration into this scope. 9264 if (II) 9265 PushOnScopeChains(ExDecl, S); 9266 else 9267 CurContext->addDecl(ExDecl); 9268 9269 ProcessDeclAttributes(S, ExDecl, D); 9270 return ExDecl; 9271} 9272 9273Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9274 Expr *AssertExpr, 9275 Expr *AssertMessageExpr_, 9276 SourceLocation RParenLoc) { 9277 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9278 9279 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9280 llvm::APSInt Value(32); 9281 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 9282 Diag(StaticAssertLoc, 9283 diag::err_static_assert_expression_is_not_constant) << 9284 AssertExpr->getSourceRange(); 9285 return 0; 9286 } 9287 9288 if (Value == 0) { 9289 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9290 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9291 } 9292 } 9293 9294 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9295 return 0; 9296 9297 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9298 AssertExpr, AssertMessage, RParenLoc); 9299 9300 CurContext->addDecl(Decl); 9301 return Decl; 9302} 9303 9304/// \brief Perform semantic analysis of the given friend type declaration. 9305/// 9306/// \returns A friend declaration that. 9307FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 9308 TypeSourceInfo *TSInfo) { 9309 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9310 9311 QualType T = TSInfo->getType(); 9312 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9313 9314 if (!getLangOptions().CPlusPlus0x) { 9315 // C++03 [class.friend]p2: 9316 // An elaborated-type-specifier shall be used in a friend declaration 9317 // for a class.* 9318 // 9319 // * The class-key of the elaborated-type-specifier is required. 9320 if (!ActiveTemplateInstantiations.empty()) { 9321 // Do not complain about the form of friend template types during 9322 // template instantiation; we will already have complained when the 9323 // template was declared. 9324 } else if (!T->isElaboratedTypeSpecifier()) { 9325 // If we evaluated the type to a record type, suggest putting 9326 // a tag in front. 9327 if (const RecordType *RT = T->getAs<RecordType>()) { 9328 RecordDecl *RD = RT->getDecl(); 9329 9330 std::string InsertionText = std::string(" ") + RD->getKindName(); 9331 9332 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 9333 << (unsigned) RD->getTagKind() 9334 << T 9335 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9336 InsertionText); 9337 } else { 9338 Diag(FriendLoc, diag::ext_nonclass_type_friend) 9339 << T 9340 << SourceRange(FriendLoc, TypeRange.getEnd()); 9341 } 9342 } else if (T->getAs<EnumType>()) { 9343 Diag(FriendLoc, diag::ext_enum_friend) 9344 << T 9345 << SourceRange(FriendLoc, TypeRange.getEnd()); 9346 } 9347 } 9348 9349 // C++0x [class.friend]p3: 9350 // If the type specifier in a friend declaration designates a (possibly 9351 // cv-qualified) class type, that class is declared as a friend; otherwise, 9352 // the friend declaration is ignored. 9353 9354 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9355 // in [class.friend]p3 that we do not implement. 9356 9357 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 9358} 9359 9360/// Handle a friend tag declaration where the scope specifier was 9361/// templated. 9362Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9363 unsigned TagSpec, SourceLocation TagLoc, 9364 CXXScopeSpec &SS, 9365 IdentifierInfo *Name, SourceLocation NameLoc, 9366 AttributeList *Attr, 9367 MultiTemplateParamsArg TempParamLists) { 9368 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9369 9370 bool isExplicitSpecialization = false; 9371 bool Invalid = false; 9372 9373 if (TemplateParameterList *TemplateParams 9374 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9375 TempParamLists.get(), 9376 TempParamLists.size(), 9377 /*friend*/ true, 9378 isExplicitSpecialization, 9379 Invalid)) { 9380 if (TemplateParams->size() > 0) { 9381 // This is a declaration of a class template. 9382 if (Invalid) 9383 return 0; 9384 9385 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9386 SS, Name, NameLoc, Attr, 9387 TemplateParams, AS_public, 9388 TempParamLists.size() - 1, 9389 (TemplateParameterList**) TempParamLists.release()).take(); 9390 } else { 9391 // The "template<>" header is extraneous. 9392 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9393 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9394 isExplicitSpecialization = true; 9395 } 9396 } 9397 9398 if (Invalid) return 0; 9399 9400 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9401 9402 bool isAllExplicitSpecializations = true; 9403 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9404 if (TempParamLists.get()[I]->size()) { 9405 isAllExplicitSpecializations = false; 9406 break; 9407 } 9408 } 9409 9410 // FIXME: don't ignore attributes. 9411 9412 // If it's explicit specializations all the way down, just forget 9413 // about the template header and build an appropriate non-templated 9414 // friend. TODO: for source fidelity, remember the headers. 9415 if (isAllExplicitSpecializations) { 9416 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9417 ElaboratedTypeKeyword Keyword 9418 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9419 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9420 *Name, NameLoc); 9421 if (T.isNull()) 9422 return 0; 9423 9424 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9425 if (isa<DependentNameType>(T)) { 9426 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9427 TL.setKeywordLoc(TagLoc); 9428 TL.setQualifierLoc(QualifierLoc); 9429 TL.setNameLoc(NameLoc); 9430 } else { 9431 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9432 TL.setKeywordLoc(TagLoc); 9433 TL.setQualifierLoc(QualifierLoc); 9434 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9435 } 9436 9437 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9438 TSI, FriendLoc); 9439 Friend->setAccess(AS_public); 9440 CurContext->addDecl(Friend); 9441 return Friend; 9442 } 9443 9444 // Handle the case of a templated-scope friend class. e.g. 9445 // template <class T> class A<T>::B; 9446 // FIXME: we don't support these right now. 9447 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9448 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9449 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9450 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9451 TL.setKeywordLoc(TagLoc); 9452 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9453 TL.setNameLoc(NameLoc); 9454 9455 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9456 TSI, FriendLoc); 9457 Friend->setAccess(AS_public); 9458 Friend->setUnsupportedFriend(true); 9459 CurContext->addDecl(Friend); 9460 return Friend; 9461} 9462 9463 9464/// Handle a friend type declaration. This works in tandem with 9465/// ActOnTag. 9466/// 9467/// Notes on friend class templates: 9468/// 9469/// We generally treat friend class declarations as if they were 9470/// declaring a class. So, for example, the elaborated type specifier 9471/// in a friend declaration is required to obey the restrictions of a 9472/// class-head (i.e. no typedefs in the scope chain), template 9473/// parameters are required to match up with simple template-ids, &c. 9474/// However, unlike when declaring a template specialization, it's 9475/// okay to refer to a template specialization without an empty 9476/// template parameter declaration, e.g. 9477/// friend class A<T>::B<unsigned>; 9478/// We permit this as a special case; if there are any template 9479/// parameters present at all, require proper matching, i.e. 9480/// template <> template <class T> friend class A<int>::B; 9481Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9482 MultiTemplateParamsArg TempParams) { 9483 SourceLocation Loc = DS.getSourceRange().getBegin(); 9484 9485 assert(DS.isFriendSpecified()); 9486 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9487 9488 // Try to convert the decl specifier to a type. This works for 9489 // friend templates because ActOnTag never produces a ClassTemplateDecl 9490 // for a TUK_Friend. 9491 Declarator TheDeclarator(DS, Declarator::MemberContext); 9492 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9493 QualType T = TSI->getType(); 9494 if (TheDeclarator.isInvalidType()) 9495 return 0; 9496 9497 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9498 return 0; 9499 9500 // This is definitely an error in C++98. It's probably meant to 9501 // be forbidden in C++0x, too, but the specification is just 9502 // poorly written. 9503 // 9504 // The problem is with declarations like the following: 9505 // template <T> friend A<T>::foo; 9506 // where deciding whether a class C is a friend or not now hinges 9507 // on whether there exists an instantiation of A that causes 9508 // 'foo' to equal C. There are restrictions on class-heads 9509 // (which we declare (by fiat) elaborated friend declarations to 9510 // be) that makes this tractable. 9511 // 9512 // FIXME: handle "template <> friend class A<T>;", which 9513 // is possibly well-formed? Who even knows? 9514 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9515 Diag(Loc, diag::err_tagless_friend_type_template) 9516 << DS.getSourceRange(); 9517 return 0; 9518 } 9519 9520 // C++98 [class.friend]p1: A friend of a class is a function 9521 // or class that is not a member of the class . . . 9522 // This is fixed in DR77, which just barely didn't make the C++03 9523 // deadline. It's also a very silly restriction that seriously 9524 // affects inner classes and which nobody else seems to implement; 9525 // thus we never diagnose it, not even in -pedantic. 9526 // 9527 // But note that we could warn about it: it's always useless to 9528 // friend one of your own members (it's not, however, worthless to 9529 // friend a member of an arbitrary specialization of your template). 9530 9531 Decl *D; 9532 if (unsigned NumTempParamLists = TempParams.size()) 9533 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9534 NumTempParamLists, 9535 TempParams.release(), 9536 TSI, 9537 DS.getFriendSpecLoc()); 9538 else 9539 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 9540 9541 if (!D) 9542 return 0; 9543 9544 D->setAccess(AS_public); 9545 CurContext->addDecl(D); 9546 9547 return D; 9548} 9549 9550Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 9551 MultiTemplateParamsArg TemplateParams) { 9552 const DeclSpec &DS = D.getDeclSpec(); 9553 9554 assert(DS.isFriendSpecified()); 9555 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9556 9557 SourceLocation Loc = D.getIdentifierLoc(); 9558 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9559 QualType T = TInfo->getType(); 9560 9561 // C++ [class.friend]p1 9562 // A friend of a class is a function or class.... 9563 // Note that this sees through typedefs, which is intended. 9564 // It *doesn't* see through dependent types, which is correct 9565 // according to [temp.arg.type]p3: 9566 // If a declaration acquires a function type through a 9567 // type dependent on a template-parameter and this causes 9568 // a declaration that does not use the syntactic form of a 9569 // function declarator to have a function type, the program 9570 // is ill-formed. 9571 if (!T->isFunctionType()) { 9572 Diag(Loc, diag::err_unexpected_friend); 9573 9574 // It might be worthwhile to try to recover by creating an 9575 // appropriate declaration. 9576 return 0; 9577 } 9578 9579 // C++ [namespace.memdef]p3 9580 // - If a friend declaration in a non-local class first declares a 9581 // class or function, the friend class or function is a member 9582 // of the innermost enclosing namespace. 9583 // - The name of the friend is not found by simple name lookup 9584 // until a matching declaration is provided in that namespace 9585 // scope (either before or after the class declaration granting 9586 // friendship). 9587 // - If a friend function is called, its name may be found by the 9588 // name lookup that considers functions from namespaces and 9589 // classes associated with the types of the function arguments. 9590 // - When looking for a prior declaration of a class or a function 9591 // declared as a friend, scopes outside the innermost enclosing 9592 // namespace scope are not considered. 9593 9594 CXXScopeSpec &SS = D.getCXXScopeSpec(); 9595 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 9596 DeclarationName Name = NameInfo.getName(); 9597 assert(Name); 9598 9599 // Check for unexpanded parameter packs. 9600 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 9601 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 9602 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 9603 return 0; 9604 9605 // The context we found the declaration in, or in which we should 9606 // create the declaration. 9607 DeclContext *DC; 9608 Scope *DCScope = S; 9609 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 9610 ForRedeclaration); 9611 9612 // FIXME: there are different rules in local classes 9613 9614 // There are four cases here. 9615 // - There's no scope specifier, in which case we just go to the 9616 // appropriate scope and look for a function or function template 9617 // there as appropriate. 9618 // Recover from invalid scope qualifiers as if they just weren't there. 9619 if (SS.isInvalid() || !SS.isSet()) { 9620 // C++0x [namespace.memdef]p3: 9621 // If the name in a friend declaration is neither qualified nor 9622 // a template-id and the declaration is a function or an 9623 // elaborated-type-specifier, the lookup to determine whether 9624 // the entity has been previously declared shall not consider 9625 // any scopes outside the innermost enclosing namespace. 9626 // C++0x [class.friend]p11: 9627 // If a friend declaration appears in a local class and the name 9628 // specified is an unqualified name, a prior declaration is 9629 // looked up without considering scopes that are outside the 9630 // innermost enclosing non-class scope. For a friend function 9631 // declaration, if there is no prior declaration, the program is 9632 // ill-formed. 9633 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 9634 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 9635 9636 // Find the appropriate context according to the above. 9637 DC = CurContext; 9638 while (true) { 9639 // Skip class contexts. If someone can cite chapter and verse 9640 // for this behavior, that would be nice --- it's what GCC and 9641 // EDG do, and it seems like a reasonable intent, but the spec 9642 // really only says that checks for unqualified existing 9643 // declarations should stop at the nearest enclosing namespace, 9644 // not that they should only consider the nearest enclosing 9645 // namespace. 9646 while (DC->isRecord()) 9647 DC = DC->getParent(); 9648 9649 LookupQualifiedName(Previous, DC); 9650 9651 // TODO: decide what we think about using declarations. 9652 if (isLocal || !Previous.empty()) 9653 break; 9654 9655 if (isTemplateId) { 9656 if (isa<TranslationUnitDecl>(DC)) break; 9657 } else { 9658 if (DC->isFileContext()) break; 9659 } 9660 DC = DC->getParent(); 9661 } 9662 9663 // C++ [class.friend]p1: A friend of a class is a function or 9664 // class that is not a member of the class . . . 9665 // C++0x changes this for both friend types and functions. 9666 // Most C++ 98 compilers do seem to give an error here, so 9667 // we do, too. 9668 if (!Previous.empty() && DC->Equals(CurContext) 9669 && !getLangOptions().CPlusPlus0x) 9670 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 9671 9672 DCScope = getScopeForDeclContext(S, DC); 9673 9674 // - There's a non-dependent scope specifier, in which case we 9675 // compute it and do a previous lookup there for a function 9676 // or function template. 9677 } else if (!SS.getScopeRep()->isDependent()) { 9678 DC = computeDeclContext(SS); 9679 if (!DC) return 0; 9680 9681 if (RequireCompleteDeclContext(SS, DC)) return 0; 9682 9683 LookupQualifiedName(Previous, DC); 9684 9685 // Ignore things found implicitly in the wrong scope. 9686 // TODO: better diagnostics for this case. Suggesting the right 9687 // qualified scope would be nice... 9688 LookupResult::Filter F = Previous.makeFilter(); 9689 while (F.hasNext()) { 9690 NamedDecl *D = F.next(); 9691 if (!DC->InEnclosingNamespaceSetOf( 9692 D->getDeclContext()->getRedeclContext())) 9693 F.erase(); 9694 } 9695 F.done(); 9696 9697 if (Previous.empty()) { 9698 D.setInvalidType(); 9699 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 9700 return 0; 9701 } 9702 9703 // C++ [class.friend]p1: A friend of a class is a function or 9704 // class that is not a member of the class . . . 9705 if (DC->Equals(CurContext)) 9706 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 9707 9708 // - There's a scope specifier that does not match any template 9709 // parameter lists, in which case we use some arbitrary context, 9710 // create a method or method template, and wait for instantiation. 9711 // - There's a scope specifier that does match some template 9712 // parameter lists, which we don't handle right now. 9713 } else { 9714 DC = CurContext; 9715 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 9716 } 9717 9718 if (!DC->isRecord()) { 9719 // This implies that it has to be an operator or function. 9720 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 9721 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 9722 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 9723 Diag(Loc, diag::err_introducing_special_friend) << 9724 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 9725 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 9726 return 0; 9727 } 9728 } 9729 9730 bool Redeclaration = false; 9731 bool AddToScope = true; 9732 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 9733 move(TemplateParams), 9734 IsDefinition, 9735 Redeclaration, AddToScope); 9736 if (!ND) return 0; 9737 9738 assert(ND->getDeclContext() == DC); 9739 assert(ND->getLexicalDeclContext() == CurContext); 9740 9741 // Add the function declaration to the appropriate lookup tables, 9742 // adjusting the redeclarations list as necessary. We don't 9743 // want to do this yet if the friending class is dependent. 9744 // 9745 // Also update the scope-based lookup if the target context's 9746 // lookup context is in lexical scope. 9747 if (!CurContext->isDependentContext()) { 9748 DC = DC->getRedeclContext(); 9749 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 9750 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 9751 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 9752 } 9753 9754 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 9755 D.getIdentifierLoc(), ND, 9756 DS.getFriendSpecLoc()); 9757 FrD->setAccess(AS_public); 9758 CurContext->addDecl(FrD); 9759 9760 if (ND->isInvalidDecl()) 9761 FrD->setInvalidDecl(); 9762 else { 9763 FunctionDecl *FD; 9764 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 9765 FD = FTD->getTemplatedDecl(); 9766 else 9767 FD = cast<FunctionDecl>(ND); 9768 9769 // Mark templated-scope function declarations as unsupported. 9770 if (FD->getNumTemplateParameterLists()) 9771 FrD->setUnsupportedFriend(true); 9772 } 9773 9774 return ND; 9775} 9776 9777void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 9778 AdjustDeclIfTemplate(Dcl); 9779 9780 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 9781 if (!Fn) { 9782 Diag(DelLoc, diag::err_deleted_non_function); 9783 return; 9784 } 9785 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 9786 Diag(DelLoc, diag::err_deleted_decl_not_first); 9787 Diag(Prev->getLocation(), diag::note_previous_declaration); 9788 // If the declaration wasn't the first, we delete the function anyway for 9789 // recovery. 9790 } 9791 Fn->setDeletedAsWritten(); 9792} 9793 9794void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 9795 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 9796 9797 if (MD) { 9798 if (MD->getParent()->isDependentType()) { 9799 MD->setDefaulted(); 9800 MD->setExplicitlyDefaulted(); 9801 return; 9802 } 9803 9804 CXXSpecialMember Member = getSpecialMember(MD); 9805 if (Member == CXXInvalid) { 9806 Diag(DefaultLoc, diag::err_default_special_members); 9807 return; 9808 } 9809 9810 MD->setDefaulted(); 9811 MD->setExplicitlyDefaulted(); 9812 9813 // If this definition appears within the record, do the checking when 9814 // the record is complete. 9815 const FunctionDecl *Primary = MD; 9816 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 9817 // Find the uninstantiated declaration that actually had the '= default' 9818 // on it. 9819 MD->getTemplateInstantiationPattern()->isDefined(Primary); 9820 9821 if (Primary == Primary->getCanonicalDecl()) 9822 return; 9823 9824 switch (Member) { 9825 case CXXDefaultConstructor: { 9826 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 9827 CheckExplicitlyDefaultedDefaultConstructor(CD); 9828 if (!CD->isInvalidDecl()) 9829 DefineImplicitDefaultConstructor(DefaultLoc, CD); 9830 break; 9831 } 9832 9833 case CXXCopyConstructor: { 9834 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 9835 CheckExplicitlyDefaultedCopyConstructor(CD); 9836 if (!CD->isInvalidDecl()) 9837 DefineImplicitCopyConstructor(DefaultLoc, CD); 9838 break; 9839 } 9840 9841 case CXXCopyAssignment: { 9842 CheckExplicitlyDefaultedCopyAssignment(MD); 9843 if (!MD->isInvalidDecl()) 9844 DefineImplicitCopyAssignment(DefaultLoc, MD); 9845 break; 9846 } 9847 9848 case CXXDestructor: { 9849 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 9850 CheckExplicitlyDefaultedDestructor(DD); 9851 if (!DD->isInvalidDecl()) 9852 DefineImplicitDestructor(DefaultLoc, DD); 9853 break; 9854 } 9855 9856 case CXXMoveConstructor: { 9857 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 9858 CheckExplicitlyDefaultedMoveConstructor(CD); 9859 if (!CD->isInvalidDecl()) 9860 DefineImplicitMoveConstructor(DefaultLoc, CD); 9861 break; 9862 } 9863 9864 case CXXMoveAssignment: { 9865 CheckExplicitlyDefaultedMoveAssignment(MD); 9866 if (!MD->isInvalidDecl()) 9867 DefineImplicitMoveAssignment(DefaultLoc, MD); 9868 break; 9869 } 9870 9871 case CXXInvalid: 9872 assert(false && "Invalid special member."); 9873 break; 9874 } 9875 } else { 9876 Diag(DefaultLoc, diag::err_default_special_members); 9877 } 9878} 9879 9880static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 9881 for (Stmt::child_range CI = S->children(); CI; ++CI) { 9882 Stmt *SubStmt = *CI; 9883 if (!SubStmt) 9884 continue; 9885 if (isa<ReturnStmt>(SubStmt)) 9886 Self.Diag(SubStmt->getSourceRange().getBegin(), 9887 diag::err_return_in_constructor_handler); 9888 if (!isa<Expr>(SubStmt)) 9889 SearchForReturnInStmt(Self, SubStmt); 9890 } 9891} 9892 9893void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 9894 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 9895 CXXCatchStmt *Handler = TryBlock->getHandler(I); 9896 SearchForReturnInStmt(*this, Handler); 9897 } 9898} 9899 9900bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 9901 const CXXMethodDecl *Old) { 9902 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 9903 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 9904 9905 if (Context.hasSameType(NewTy, OldTy) || 9906 NewTy->isDependentType() || OldTy->isDependentType()) 9907 return false; 9908 9909 // Check if the return types are covariant 9910 QualType NewClassTy, OldClassTy; 9911 9912 /// Both types must be pointers or references to classes. 9913 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 9914 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 9915 NewClassTy = NewPT->getPointeeType(); 9916 OldClassTy = OldPT->getPointeeType(); 9917 } 9918 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 9919 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 9920 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 9921 NewClassTy = NewRT->getPointeeType(); 9922 OldClassTy = OldRT->getPointeeType(); 9923 } 9924 } 9925 } 9926 9927 // The return types aren't either both pointers or references to a class type. 9928 if (NewClassTy.isNull()) { 9929 Diag(New->getLocation(), 9930 diag::err_different_return_type_for_overriding_virtual_function) 9931 << New->getDeclName() << NewTy << OldTy; 9932 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 9933 9934 return true; 9935 } 9936 9937 // C++ [class.virtual]p6: 9938 // If the return type of D::f differs from the return type of B::f, the 9939 // class type in the return type of D::f shall be complete at the point of 9940 // declaration of D::f or shall be the class type D. 9941 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 9942 if (!RT->isBeingDefined() && 9943 RequireCompleteType(New->getLocation(), NewClassTy, 9944 PDiag(diag::err_covariant_return_incomplete) 9945 << New->getDeclName())) 9946 return true; 9947 } 9948 9949 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 9950 // Check if the new class derives from the old class. 9951 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 9952 Diag(New->getLocation(), 9953 diag::err_covariant_return_not_derived) 9954 << New->getDeclName() << NewTy << OldTy; 9955 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 9956 return true; 9957 } 9958 9959 // Check if we the conversion from derived to base is valid. 9960 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 9961 diag::err_covariant_return_inaccessible_base, 9962 diag::err_covariant_return_ambiguous_derived_to_base_conv, 9963 // FIXME: Should this point to the return type? 9964 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 9965 // FIXME: this note won't trigger for delayed access control 9966 // diagnostics, and it's impossible to get an undelayed error 9967 // here from access control during the original parse because 9968 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 9969 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 9970 return true; 9971 } 9972 } 9973 9974 // The qualifiers of the return types must be the same. 9975 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 9976 Diag(New->getLocation(), 9977 diag::err_covariant_return_type_different_qualifications) 9978 << New->getDeclName() << NewTy << OldTy; 9979 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 9980 return true; 9981 }; 9982 9983 9984 // The new class type must have the same or less qualifiers as the old type. 9985 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 9986 Diag(New->getLocation(), 9987 diag::err_covariant_return_type_class_type_more_qualified) 9988 << New->getDeclName() << NewTy << OldTy; 9989 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 9990 return true; 9991 }; 9992 9993 return false; 9994} 9995 9996/// \brief Mark the given method pure. 9997/// 9998/// \param Method the method to be marked pure. 9999/// 10000/// \param InitRange the source range that covers the "0" initializer. 10001bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10002 SourceLocation EndLoc = InitRange.getEnd(); 10003 if (EndLoc.isValid()) 10004 Method->setRangeEnd(EndLoc); 10005 10006 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10007 Method->setPure(); 10008 return false; 10009 } 10010 10011 if (!Method->isInvalidDecl()) 10012 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10013 << Method->getDeclName() << InitRange; 10014 return true; 10015} 10016 10017/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10018/// an initializer for the out-of-line declaration 'Dcl'. The scope 10019/// is a fresh scope pushed for just this purpose. 10020/// 10021/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10022/// static data member of class X, names should be looked up in the scope of 10023/// class X. 10024void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10025 // If there is no declaration, there was an error parsing it. 10026 if (D == 0 || D->isInvalidDecl()) return; 10027 10028 // We should only get called for declarations with scope specifiers, like: 10029 // int foo::bar; 10030 assert(D->isOutOfLine()); 10031 EnterDeclaratorContext(S, D->getDeclContext()); 10032} 10033 10034/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10035/// initializer for the out-of-line declaration 'D'. 10036void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10037 // If there is no declaration, there was an error parsing it. 10038 if (D == 0 || D->isInvalidDecl()) return; 10039 10040 assert(D->isOutOfLine()); 10041 ExitDeclaratorContext(S); 10042} 10043 10044/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10045/// C++ if/switch/while/for statement. 10046/// e.g: "if (int x = f()) {...}" 10047DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10048 // C++ 6.4p2: 10049 // The declarator shall not specify a function or an array. 10050 // The type-specifier-seq shall not contain typedef and shall not declare a 10051 // new class or enumeration. 10052 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10053 "Parser allowed 'typedef' as storage class of condition decl."); 10054 10055 Decl *Dcl = ActOnDeclarator(S, D); 10056 if (!Dcl) 10057 return true; 10058 10059 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10060 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10061 << D.getSourceRange(); 10062 return true; 10063 } 10064 10065 return Dcl; 10066} 10067 10068void Sema::LoadExternalVTableUses() { 10069 if (!ExternalSource) 10070 return; 10071 10072 SmallVector<ExternalVTableUse, 4> VTables; 10073 ExternalSource->ReadUsedVTables(VTables); 10074 SmallVector<VTableUse, 4> NewUses; 10075 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10076 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10077 = VTablesUsed.find(VTables[I].Record); 10078 // Even if a definition wasn't required before, it may be required now. 10079 if (Pos != VTablesUsed.end()) { 10080 if (!Pos->second && VTables[I].DefinitionRequired) 10081 Pos->second = true; 10082 continue; 10083 } 10084 10085 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10086 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10087 } 10088 10089 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10090} 10091 10092void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10093 bool DefinitionRequired) { 10094 // Ignore any vtable uses in unevaluated operands or for classes that do 10095 // not have a vtable. 10096 if (!Class->isDynamicClass() || Class->isDependentContext() || 10097 CurContext->isDependentContext() || 10098 ExprEvalContexts.back().Context == Unevaluated) 10099 return; 10100 10101 // Try to insert this class into the map. 10102 LoadExternalVTableUses(); 10103 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10104 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10105 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10106 if (!Pos.second) { 10107 // If we already had an entry, check to see if we are promoting this vtable 10108 // to required a definition. If so, we need to reappend to the VTableUses 10109 // list, since we may have already processed the first entry. 10110 if (DefinitionRequired && !Pos.first->second) { 10111 Pos.first->second = true; 10112 } else { 10113 // Otherwise, we can early exit. 10114 return; 10115 } 10116 } 10117 10118 // Local classes need to have their virtual members marked 10119 // immediately. For all other classes, we mark their virtual members 10120 // at the end of the translation unit. 10121 if (Class->isLocalClass()) 10122 MarkVirtualMembersReferenced(Loc, Class); 10123 else 10124 VTableUses.push_back(std::make_pair(Class, Loc)); 10125} 10126 10127bool Sema::DefineUsedVTables() { 10128 LoadExternalVTableUses(); 10129 if (VTableUses.empty()) 10130 return false; 10131 10132 // Note: The VTableUses vector could grow as a result of marking 10133 // the members of a class as "used", so we check the size each 10134 // time through the loop and prefer indices (with are stable) to 10135 // iterators (which are not). 10136 bool DefinedAnything = false; 10137 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10138 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10139 if (!Class) 10140 continue; 10141 10142 SourceLocation Loc = VTableUses[I].second; 10143 10144 // If this class has a key function, but that key function is 10145 // defined in another translation unit, we don't need to emit the 10146 // vtable even though we're using it. 10147 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10148 if (KeyFunction && !KeyFunction->hasBody()) { 10149 switch (KeyFunction->getTemplateSpecializationKind()) { 10150 case TSK_Undeclared: 10151 case TSK_ExplicitSpecialization: 10152 case TSK_ExplicitInstantiationDeclaration: 10153 // The key function is in another translation unit. 10154 continue; 10155 10156 case TSK_ExplicitInstantiationDefinition: 10157 case TSK_ImplicitInstantiation: 10158 // We will be instantiating the key function. 10159 break; 10160 } 10161 } else if (!KeyFunction) { 10162 // If we have a class with no key function that is the subject 10163 // of an explicit instantiation declaration, suppress the 10164 // vtable; it will live with the explicit instantiation 10165 // definition. 10166 bool IsExplicitInstantiationDeclaration 10167 = Class->getTemplateSpecializationKind() 10168 == TSK_ExplicitInstantiationDeclaration; 10169 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10170 REnd = Class->redecls_end(); 10171 R != REnd; ++R) { 10172 TemplateSpecializationKind TSK 10173 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10174 if (TSK == TSK_ExplicitInstantiationDeclaration) 10175 IsExplicitInstantiationDeclaration = true; 10176 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10177 IsExplicitInstantiationDeclaration = false; 10178 break; 10179 } 10180 } 10181 10182 if (IsExplicitInstantiationDeclaration) 10183 continue; 10184 } 10185 10186 // Mark all of the virtual members of this class as referenced, so 10187 // that we can build a vtable. Then, tell the AST consumer that a 10188 // vtable for this class is required. 10189 DefinedAnything = true; 10190 MarkVirtualMembersReferenced(Loc, Class); 10191 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10192 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10193 10194 // Optionally warn if we're emitting a weak vtable. 10195 if (Class->getLinkage() == ExternalLinkage && 10196 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10197 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 10198 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 10199 } 10200 } 10201 VTableUses.clear(); 10202 10203 return DefinedAnything; 10204} 10205 10206void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10207 const CXXRecordDecl *RD) { 10208 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10209 e = RD->method_end(); i != e; ++i) { 10210 CXXMethodDecl *MD = *i; 10211 10212 // C++ [basic.def.odr]p2: 10213 // [...] A virtual member function is used if it is not pure. [...] 10214 if (MD->isVirtual() && !MD->isPure()) 10215 MarkDeclarationReferenced(Loc, MD); 10216 } 10217 10218 // Only classes that have virtual bases need a VTT. 10219 if (RD->getNumVBases() == 0) 10220 return; 10221 10222 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10223 e = RD->bases_end(); i != e; ++i) { 10224 const CXXRecordDecl *Base = 10225 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10226 if (Base->getNumVBases() == 0) 10227 continue; 10228 MarkVirtualMembersReferenced(Loc, Base); 10229 } 10230} 10231 10232/// SetIvarInitializers - This routine builds initialization ASTs for the 10233/// Objective-C implementation whose ivars need be initialized. 10234void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10235 if (!getLangOptions().CPlusPlus) 10236 return; 10237 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10238 SmallVector<ObjCIvarDecl*, 8> ivars; 10239 CollectIvarsToConstructOrDestruct(OID, ivars); 10240 if (ivars.empty()) 10241 return; 10242 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10243 for (unsigned i = 0; i < ivars.size(); i++) { 10244 FieldDecl *Field = ivars[i]; 10245 if (Field->isInvalidDecl()) 10246 continue; 10247 10248 CXXCtorInitializer *Member; 10249 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10250 InitializationKind InitKind = 10251 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10252 10253 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10254 ExprResult MemberInit = 10255 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10256 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10257 // Note, MemberInit could actually come back empty if no initialization 10258 // is required (e.g., because it would call a trivial default constructor) 10259 if (!MemberInit.get() || MemberInit.isInvalid()) 10260 continue; 10261 10262 Member = 10263 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10264 SourceLocation(), 10265 MemberInit.takeAs<Expr>(), 10266 SourceLocation()); 10267 AllToInit.push_back(Member); 10268 10269 // Be sure that the destructor is accessible and is marked as referenced. 10270 if (const RecordType *RecordTy 10271 = Context.getBaseElementType(Field->getType()) 10272 ->getAs<RecordType>()) { 10273 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10274 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10275 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10276 CheckDestructorAccess(Field->getLocation(), Destructor, 10277 PDiag(diag::err_access_dtor_ivar) 10278 << Context.getBaseElementType(Field->getType())); 10279 } 10280 } 10281 } 10282 ObjCImplementation->setIvarInitializers(Context, 10283 AllToInit.data(), AllToInit.size()); 10284 } 10285} 10286 10287static 10288void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10289 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10290 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10291 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10292 Sema &S) { 10293 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10294 CE = Current.end(); 10295 if (Ctor->isInvalidDecl()) 10296 return; 10297 10298 const FunctionDecl *FNTarget = 0; 10299 CXXConstructorDecl *Target; 10300 10301 // We ignore the result here since if we don't have a body, Target will be 10302 // null below. 10303 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10304 Target 10305= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10306 10307 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10308 // Avoid dereferencing a null pointer here. 10309 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10310 10311 if (!Current.insert(Canonical)) 10312 return; 10313 10314 // We know that beyond here, we aren't chaining into a cycle. 10315 if (!Target || !Target->isDelegatingConstructor() || 10316 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10317 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10318 Valid.insert(*CI); 10319 Current.clear(); 10320 // We've hit a cycle. 10321 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10322 Current.count(TCanonical)) { 10323 // If we haven't diagnosed this cycle yet, do so now. 10324 if (!Invalid.count(TCanonical)) { 10325 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10326 diag::warn_delegating_ctor_cycle) 10327 << Ctor; 10328 10329 // Don't add a note for a function delegating directo to itself. 10330 if (TCanonical != Canonical) 10331 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10332 10333 CXXConstructorDecl *C = Target; 10334 while (C->getCanonicalDecl() != Canonical) { 10335 (void)C->getTargetConstructor()->hasBody(FNTarget); 10336 assert(FNTarget && "Ctor cycle through bodiless function"); 10337 10338 C 10339 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10340 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10341 } 10342 } 10343 10344 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10345 Invalid.insert(*CI); 10346 Current.clear(); 10347 } else { 10348 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10349 } 10350} 10351 10352 10353void Sema::CheckDelegatingCtorCycles() { 10354 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10355 10356 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10357 CE = Current.end(); 10358 10359 for (DelegatingCtorDeclsType::iterator 10360 I = DelegatingCtorDecls.begin(ExternalSource), 10361 E = DelegatingCtorDecls.end(); 10362 I != E; ++I) { 10363 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10364 } 10365 10366 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10367 (*CI)->setInvalidDecl(); 10368} 10369