SemaDeclCXX.cpp revision 221c27f0d34c5938d84bbb8fafe1c3e3f1f87f2e
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/Sema/ScopeInfo.h" 20#include "clang/AST/ASTConsumer.h" 21#include "clang/AST/ASTContext.h" 22#include "clang/AST/ASTMutationListener.h" 23#include "clang/AST/CharUnits.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclVisitor.h" 26#include "clang/AST/ExprCXX.h" 27#include "clang/AST/RecordLayout.h" 28#include "clang/AST/StmtVisitor.h" 29#include "clang/AST/TypeLoc.h" 30#include "clang/AST/TypeOrdering.h" 31#include "clang/Sema/DeclSpec.h" 32#include "clang/Sema/ParsedTemplate.h" 33#include "clang/Basic/PartialDiagnostic.h" 34#include "clang/Lex/Preprocessor.h" 35#include "llvm/ADT/SmallString.h" 36#include "llvm/ADT/STLExtras.h" 37#include <map> 38#include <set> 39 40using namespace clang; 41 42//===----------------------------------------------------------------------===// 43// CheckDefaultArgumentVisitor 44//===----------------------------------------------------------------------===// 45 46namespace { 47 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 48 /// the default argument of a parameter to determine whether it 49 /// contains any ill-formed subexpressions. For example, this will 50 /// diagnose the use of local variables or parameters within the 51 /// default argument expression. 52 class CheckDefaultArgumentVisitor 53 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 54 Expr *DefaultArg; 55 Sema *S; 56 57 public: 58 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 59 : DefaultArg(defarg), S(s) {} 60 61 bool VisitExpr(Expr *Node); 62 bool VisitDeclRefExpr(DeclRefExpr *DRE); 63 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 64 bool VisitLambdaExpr(LambdaExpr *Lambda); 65 }; 66 67 /// VisitExpr - Visit all of the children of this expression. 68 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 69 bool IsInvalid = false; 70 for (Stmt::child_range I = Node->children(); I; ++I) 71 IsInvalid |= Visit(*I); 72 return IsInvalid; 73 } 74 75 /// VisitDeclRefExpr - Visit a reference to a declaration, to 76 /// determine whether this declaration can be used in the default 77 /// argument expression. 78 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 79 NamedDecl *Decl = DRE->getDecl(); 80 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 81 // C++ [dcl.fct.default]p9 82 // Default arguments are evaluated each time the function is 83 // called. The order of evaluation of function arguments is 84 // unspecified. Consequently, parameters of a function shall not 85 // be used in default argument expressions, even if they are not 86 // evaluated. Parameters of a function declared before a default 87 // argument expression are in scope and can hide namespace and 88 // class member names. 89 return S->Diag(DRE->getSourceRange().getBegin(), 90 diag::err_param_default_argument_references_param) 91 << Param->getDeclName() << DefaultArg->getSourceRange(); 92 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 93 // C++ [dcl.fct.default]p7 94 // Local variables shall not be used in default argument 95 // expressions. 96 if (VDecl->isLocalVarDecl()) 97 return S->Diag(DRE->getSourceRange().getBegin(), 98 diag::err_param_default_argument_references_local) 99 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 100 } 101 102 return false; 103 } 104 105 /// VisitCXXThisExpr - Visit a C++ "this" expression. 106 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 107 // C++ [dcl.fct.default]p8: 108 // The keyword this shall not be used in a default argument of a 109 // member function. 110 return S->Diag(ThisE->getSourceRange().getBegin(), 111 diag::err_param_default_argument_references_this) 112 << ThisE->getSourceRange(); 113 } 114 115 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 116 // C++11 [expr.lambda.prim]p13: 117 // A lambda-expression appearing in a default argument shall not 118 // implicitly or explicitly capture any entity. 119 if (Lambda->capture_begin() == Lambda->capture_end()) 120 return false; 121 122 return S->Diag(Lambda->getLocStart(), 123 diag::err_lambda_capture_default_arg); 124 } 125} 126 127void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 128 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 129 // If we have an MSAny or unknown spec already, don't bother. 130 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 131 return; 132 133 const FunctionProtoType *Proto 134 = Method->getType()->getAs<FunctionProtoType>(); 135 136 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 137 138 // If this function can throw any exceptions, make a note of that. 139 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 140 ClearExceptions(); 141 ComputedEST = EST; 142 return; 143 } 144 145 // FIXME: If the call to this decl is using any of its default arguments, we 146 // need to search them for potentially-throwing calls. 147 148 // If this function has a basic noexcept, it doesn't affect the outcome. 149 if (EST == EST_BasicNoexcept) 150 return; 151 152 // If we have a throw-all spec at this point, ignore the function. 153 if (ComputedEST == EST_None) 154 return; 155 156 // If we're still at noexcept(true) and there's a nothrow() callee, 157 // change to that specification. 158 if (EST == EST_DynamicNone) { 159 if (ComputedEST == EST_BasicNoexcept) 160 ComputedEST = EST_DynamicNone; 161 return; 162 } 163 164 // Check out noexcept specs. 165 if (EST == EST_ComputedNoexcept) { 166 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 167 assert(NR != FunctionProtoType::NR_NoNoexcept && 168 "Must have noexcept result for EST_ComputedNoexcept."); 169 assert(NR != FunctionProtoType::NR_Dependent && 170 "Should not generate implicit declarations for dependent cases, " 171 "and don't know how to handle them anyway."); 172 173 // noexcept(false) -> no spec on the new function 174 if (NR == FunctionProtoType::NR_Throw) { 175 ClearExceptions(); 176 ComputedEST = EST_None; 177 } 178 // noexcept(true) won't change anything either. 179 return; 180 } 181 182 assert(EST == EST_Dynamic && "EST case not considered earlier."); 183 assert(ComputedEST != EST_None && 184 "Shouldn't collect exceptions when throw-all is guaranteed."); 185 ComputedEST = EST_Dynamic; 186 // Record the exceptions in this function's exception specification. 187 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 188 EEnd = Proto->exception_end(); 189 E != EEnd; ++E) 190 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 191 Exceptions.push_back(*E); 192} 193 194void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 195 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 196 return; 197 198 // FIXME: 199 // 200 // C++0x [except.spec]p14: 201 // [An] implicit exception-specification specifies the type-id T if and 202 // only if T is allowed by the exception-specification of a function directly 203 // invoked by f's implicit definition; f shall allow all exceptions if any 204 // function it directly invokes allows all exceptions, and f shall allow no 205 // exceptions if every function it directly invokes allows no exceptions. 206 // 207 // Note in particular that if an implicit exception-specification is generated 208 // for a function containing a throw-expression, that specification can still 209 // be noexcept(true). 210 // 211 // Note also that 'directly invoked' is not defined in the standard, and there 212 // is no indication that we should only consider potentially-evaluated calls. 213 // 214 // Ultimately we should implement the intent of the standard: the exception 215 // specification should be the set of exceptions which can be thrown by the 216 // implicit definition. For now, we assume that any non-nothrow expression can 217 // throw any exception. 218 219 if (E->CanThrow(*Context)) 220 ComputedEST = EST_None; 221} 222 223bool 224Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 225 SourceLocation EqualLoc) { 226 if (RequireCompleteType(Param->getLocation(), Param->getType(), 227 diag::err_typecheck_decl_incomplete_type)) { 228 Param->setInvalidDecl(); 229 return true; 230 } 231 232 // C++ [dcl.fct.default]p5 233 // A default argument expression is implicitly converted (clause 234 // 4) to the parameter type. The default argument expression has 235 // the same semantic constraints as the initializer expression in 236 // a declaration of a variable of the parameter type, using the 237 // copy-initialization semantics (8.5). 238 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 239 Param); 240 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 241 EqualLoc); 242 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 243 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 244 MultiExprArg(*this, &Arg, 1)); 245 if (Result.isInvalid()) 246 return true; 247 Arg = Result.takeAs<Expr>(); 248 249 CheckImplicitConversions(Arg, EqualLoc); 250 Arg = MaybeCreateExprWithCleanups(Arg); 251 252 // Okay: add the default argument to the parameter 253 Param->setDefaultArg(Arg); 254 255 // We have already instantiated this parameter; provide each of the 256 // instantiations with the uninstantiated default argument. 257 UnparsedDefaultArgInstantiationsMap::iterator InstPos 258 = UnparsedDefaultArgInstantiations.find(Param); 259 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 260 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 261 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 262 263 // We're done tracking this parameter's instantiations. 264 UnparsedDefaultArgInstantiations.erase(InstPos); 265 } 266 267 return false; 268} 269 270/// ActOnParamDefaultArgument - Check whether the default argument 271/// provided for a function parameter is well-formed. If so, attach it 272/// to the parameter declaration. 273void 274Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 275 Expr *DefaultArg) { 276 if (!param || !DefaultArg) 277 return; 278 279 ParmVarDecl *Param = cast<ParmVarDecl>(param); 280 UnparsedDefaultArgLocs.erase(Param); 281 282 // Default arguments are only permitted in C++ 283 if (!getLangOptions().CPlusPlus) { 284 Diag(EqualLoc, diag::err_param_default_argument) 285 << DefaultArg->getSourceRange(); 286 Param->setInvalidDecl(); 287 return; 288 } 289 290 // Check for unexpanded parameter packs. 291 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 292 Param->setInvalidDecl(); 293 return; 294 } 295 296 // Check that the default argument is well-formed 297 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 298 if (DefaultArgChecker.Visit(DefaultArg)) { 299 Param->setInvalidDecl(); 300 return; 301 } 302 303 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 304} 305 306/// ActOnParamUnparsedDefaultArgument - We've seen a default 307/// argument for a function parameter, but we can't parse it yet 308/// because we're inside a class definition. Note that this default 309/// argument will be parsed later. 310void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 311 SourceLocation EqualLoc, 312 SourceLocation ArgLoc) { 313 if (!param) 314 return; 315 316 ParmVarDecl *Param = cast<ParmVarDecl>(param); 317 if (Param) 318 Param->setUnparsedDefaultArg(); 319 320 UnparsedDefaultArgLocs[Param] = ArgLoc; 321} 322 323/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 324/// the default argument for the parameter param failed. 325void Sema::ActOnParamDefaultArgumentError(Decl *param) { 326 if (!param) 327 return; 328 329 ParmVarDecl *Param = cast<ParmVarDecl>(param); 330 331 Param->setInvalidDecl(); 332 333 UnparsedDefaultArgLocs.erase(Param); 334} 335 336/// CheckExtraCXXDefaultArguments - Check for any extra default 337/// arguments in the declarator, which is not a function declaration 338/// or definition and therefore is not permitted to have default 339/// arguments. This routine should be invoked for every declarator 340/// that is not a function declaration or definition. 341void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 342 // C++ [dcl.fct.default]p3 343 // A default argument expression shall be specified only in the 344 // parameter-declaration-clause of a function declaration or in a 345 // template-parameter (14.1). It shall not be specified for a 346 // parameter pack. If it is specified in a 347 // parameter-declaration-clause, it shall not occur within a 348 // declarator or abstract-declarator of a parameter-declaration. 349 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 350 DeclaratorChunk &chunk = D.getTypeObject(i); 351 if (chunk.Kind == DeclaratorChunk::Function) { 352 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 353 ParmVarDecl *Param = 354 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 355 if (Param->hasUnparsedDefaultArg()) { 356 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 357 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 358 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 359 delete Toks; 360 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 361 } else if (Param->getDefaultArg()) { 362 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 363 << Param->getDefaultArg()->getSourceRange(); 364 Param->setDefaultArg(0); 365 } 366 } 367 } 368 } 369} 370 371// MergeCXXFunctionDecl - Merge two declarations of the same C++ 372// function, once we already know that they have the same 373// type. Subroutine of MergeFunctionDecl. Returns true if there was an 374// error, false otherwise. 375bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 376 bool Invalid = false; 377 378 // C++ [dcl.fct.default]p4: 379 // For non-template functions, default arguments can be added in 380 // later declarations of a function in the same 381 // scope. Declarations in different scopes have completely 382 // distinct sets of default arguments. That is, declarations in 383 // inner scopes do not acquire default arguments from 384 // declarations in outer scopes, and vice versa. In a given 385 // function declaration, all parameters subsequent to a 386 // parameter with a default argument shall have default 387 // arguments supplied in this or previous declarations. A 388 // default argument shall not be redefined by a later 389 // declaration (not even to the same value). 390 // 391 // C++ [dcl.fct.default]p6: 392 // Except for member functions of class templates, the default arguments 393 // in a member function definition that appears outside of the class 394 // definition are added to the set of default arguments provided by the 395 // member function declaration in the class definition. 396 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 397 ParmVarDecl *OldParam = Old->getParamDecl(p); 398 ParmVarDecl *NewParam = New->getParamDecl(p); 399 400 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 401 402 unsigned DiagDefaultParamID = 403 diag::err_param_default_argument_redefinition; 404 405 // MSVC accepts that default parameters be redefined for member functions 406 // of template class. The new default parameter's value is ignored. 407 Invalid = true; 408 if (getLangOptions().MicrosoftExt) { 409 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 410 if (MD && MD->getParent()->getDescribedClassTemplate()) { 411 // Merge the old default argument into the new parameter. 412 NewParam->setHasInheritedDefaultArg(); 413 if (OldParam->hasUninstantiatedDefaultArg()) 414 NewParam->setUninstantiatedDefaultArg( 415 OldParam->getUninstantiatedDefaultArg()); 416 else 417 NewParam->setDefaultArg(OldParam->getInit()); 418 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 419 Invalid = false; 420 } 421 } 422 423 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 424 // hint here. Alternatively, we could walk the type-source information 425 // for NewParam to find the last source location in the type... but it 426 // isn't worth the effort right now. This is the kind of test case that 427 // is hard to get right: 428 // int f(int); 429 // void g(int (*fp)(int) = f); 430 // void g(int (*fp)(int) = &f); 431 Diag(NewParam->getLocation(), DiagDefaultParamID) 432 << NewParam->getDefaultArgRange(); 433 434 // Look for the function declaration where the default argument was 435 // actually written, which may be a declaration prior to Old. 436 for (FunctionDecl *Older = Old->getPreviousDecl(); 437 Older; Older = Older->getPreviousDecl()) { 438 if (!Older->getParamDecl(p)->hasDefaultArg()) 439 break; 440 441 OldParam = Older->getParamDecl(p); 442 } 443 444 Diag(OldParam->getLocation(), diag::note_previous_definition) 445 << OldParam->getDefaultArgRange(); 446 } else if (OldParam->hasDefaultArg()) { 447 // Merge the old default argument into the new parameter. 448 // It's important to use getInit() here; getDefaultArg() 449 // strips off any top-level ExprWithCleanups. 450 NewParam->setHasInheritedDefaultArg(); 451 if (OldParam->hasUninstantiatedDefaultArg()) 452 NewParam->setUninstantiatedDefaultArg( 453 OldParam->getUninstantiatedDefaultArg()); 454 else 455 NewParam->setDefaultArg(OldParam->getInit()); 456 } else if (NewParam->hasDefaultArg()) { 457 if (New->getDescribedFunctionTemplate()) { 458 // Paragraph 4, quoted above, only applies to non-template functions. 459 Diag(NewParam->getLocation(), 460 diag::err_param_default_argument_template_redecl) 461 << NewParam->getDefaultArgRange(); 462 Diag(Old->getLocation(), diag::note_template_prev_declaration) 463 << false; 464 } else if (New->getTemplateSpecializationKind() 465 != TSK_ImplicitInstantiation && 466 New->getTemplateSpecializationKind() != TSK_Undeclared) { 467 // C++ [temp.expr.spec]p21: 468 // Default function arguments shall not be specified in a declaration 469 // or a definition for one of the following explicit specializations: 470 // - the explicit specialization of a function template; 471 // - the explicit specialization of a member function template; 472 // - the explicit specialization of a member function of a class 473 // template where the class template specialization to which the 474 // member function specialization belongs is implicitly 475 // instantiated. 476 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 477 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 478 << New->getDeclName() 479 << NewParam->getDefaultArgRange(); 480 } else if (New->getDeclContext()->isDependentContext()) { 481 // C++ [dcl.fct.default]p6 (DR217): 482 // Default arguments for a member function of a class template shall 483 // be specified on the initial declaration of the member function 484 // within the class template. 485 // 486 // Reading the tea leaves a bit in DR217 and its reference to DR205 487 // leads me to the conclusion that one cannot add default function 488 // arguments for an out-of-line definition of a member function of a 489 // dependent type. 490 int WhichKind = 2; 491 if (CXXRecordDecl *Record 492 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 493 if (Record->getDescribedClassTemplate()) 494 WhichKind = 0; 495 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 496 WhichKind = 1; 497 else 498 WhichKind = 2; 499 } 500 501 Diag(NewParam->getLocation(), 502 diag::err_param_default_argument_member_template_redecl) 503 << WhichKind 504 << NewParam->getDefaultArgRange(); 505 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 506 CXXSpecialMember NewSM = getSpecialMember(Ctor), 507 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 508 if (NewSM != OldSM) { 509 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 510 << NewParam->getDefaultArgRange() << NewSM; 511 Diag(Old->getLocation(), diag::note_previous_declaration_special) 512 << OldSM; 513 } 514 } 515 } 516 } 517 518 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 519 // template has a constexpr specifier then all its declarations shall 520 // contain the constexpr specifier. 521 if (New->isConstexpr() != Old->isConstexpr()) { 522 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 523 << New << New->isConstexpr(); 524 Diag(Old->getLocation(), diag::note_previous_declaration); 525 Invalid = true; 526 } 527 528 if (CheckEquivalentExceptionSpec(Old, New)) 529 Invalid = true; 530 531 return Invalid; 532} 533 534/// \brief Merge the exception specifications of two variable declarations. 535/// 536/// This is called when there's a redeclaration of a VarDecl. The function 537/// checks if the redeclaration might have an exception specification and 538/// validates compatibility and merges the specs if necessary. 539void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 540 // Shortcut if exceptions are disabled. 541 if (!getLangOptions().CXXExceptions) 542 return; 543 544 assert(Context.hasSameType(New->getType(), Old->getType()) && 545 "Should only be called if types are otherwise the same."); 546 547 QualType NewType = New->getType(); 548 QualType OldType = Old->getType(); 549 550 // We're only interested in pointers and references to functions, as well 551 // as pointers to member functions. 552 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 553 NewType = R->getPointeeType(); 554 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 555 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 556 NewType = P->getPointeeType(); 557 OldType = OldType->getAs<PointerType>()->getPointeeType(); 558 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 559 NewType = M->getPointeeType(); 560 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 561 } 562 563 if (!NewType->isFunctionProtoType()) 564 return; 565 566 // There's lots of special cases for functions. For function pointers, system 567 // libraries are hopefully not as broken so that we don't need these 568 // workarounds. 569 if (CheckEquivalentExceptionSpec( 570 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 571 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 572 New->setInvalidDecl(); 573 } 574} 575 576/// CheckCXXDefaultArguments - Verify that the default arguments for a 577/// function declaration are well-formed according to C++ 578/// [dcl.fct.default]. 579void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 580 unsigned NumParams = FD->getNumParams(); 581 unsigned p; 582 583 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 584 isa<CXXMethodDecl>(FD) && 585 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 586 587 // Find first parameter with a default argument 588 for (p = 0; p < NumParams; ++p) { 589 ParmVarDecl *Param = FD->getParamDecl(p); 590 if (Param->hasDefaultArg()) { 591 // C++11 [expr.prim.lambda]p5: 592 // [...] Default arguments (8.3.6) shall not be specified in the 593 // parameter-declaration-clause of a lambda-declarator. 594 // 595 // FIXME: Core issue 974 strikes this sentence, we only provide an 596 // extension warning. 597 if (IsLambda) 598 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 599 << Param->getDefaultArgRange(); 600 break; 601 } 602 } 603 604 // C++ [dcl.fct.default]p4: 605 // In a given function declaration, all parameters 606 // subsequent to a parameter with a default argument shall 607 // have default arguments supplied in this or previous 608 // declarations. A default argument shall not be redefined 609 // by a later declaration (not even to the same value). 610 unsigned LastMissingDefaultArg = 0; 611 for (; p < NumParams; ++p) { 612 ParmVarDecl *Param = FD->getParamDecl(p); 613 if (!Param->hasDefaultArg()) { 614 if (Param->isInvalidDecl()) 615 /* We already complained about this parameter. */; 616 else if (Param->getIdentifier()) 617 Diag(Param->getLocation(), 618 diag::err_param_default_argument_missing_name) 619 << Param->getIdentifier(); 620 else 621 Diag(Param->getLocation(), 622 diag::err_param_default_argument_missing); 623 624 LastMissingDefaultArg = p; 625 } 626 } 627 628 if (LastMissingDefaultArg > 0) { 629 // Some default arguments were missing. Clear out all of the 630 // default arguments up to (and including) the last missing 631 // default argument, so that we leave the function parameters 632 // in a semantically valid state. 633 for (p = 0; p <= LastMissingDefaultArg; ++p) { 634 ParmVarDecl *Param = FD->getParamDecl(p); 635 if (Param->hasDefaultArg()) { 636 Param->setDefaultArg(0); 637 } 638 } 639 } 640} 641 642// CheckConstexprParameterTypes - Check whether a function's parameter types 643// are all literal types. If so, return true. If not, produce a suitable 644// diagnostic and return false. 645static bool CheckConstexprParameterTypes(Sema &SemaRef, 646 const FunctionDecl *FD) { 647 unsigned ArgIndex = 0; 648 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 649 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 650 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 651 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 652 SourceLocation ParamLoc = PD->getLocation(); 653 if (!(*i)->isDependentType() && 654 SemaRef.RequireLiteralType(ParamLoc, *i, 655 SemaRef.PDiag(diag::err_constexpr_non_literal_param) 656 << ArgIndex+1 << PD->getSourceRange() 657 << isa<CXXConstructorDecl>(FD))) 658 return false; 659 } 660 return true; 661} 662 663// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 664// the requirements of a constexpr function definition or a constexpr 665// constructor definition. If so, return true. If not, produce appropriate 666// diagnostics and return false. 667// 668// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 669bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 670 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 671 if (MD && MD->isInstance()) { 672 // C++11 [dcl.constexpr]p4: 673 // The definition of a constexpr constructor shall satisfy the following 674 // constraints: 675 // - the class shall not have any virtual base classes; 676 const CXXRecordDecl *RD = MD->getParent(); 677 if (RD->getNumVBases()) { 678 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 679 << isa<CXXConstructorDecl>(NewFD) << RD->isStruct() 680 << RD->getNumVBases(); 681 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 682 E = RD->vbases_end(); I != E; ++I) 683 Diag(I->getSourceRange().getBegin(), 684 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 685 return false; 686 } 687 } 688 689 if (!isa<CXXConstructorDecl>(NewFD)) { 690 // C++11 [dcl.constexpr]p3: 691 // The definition of a constexpr function shall satisfy the following 692 // constraints: 693 // - it shall not be virtual; 694 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 695 if (Method && Method->isVirtual()) { 696 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 697 698 // If it's not obvious why this function is virtual, find an overridden 699 // function which uses the 'virtual' keyword. 700 const CXXMethodDecl *WrittenVirtual = Method; 701 while (!WrittenVirtual->isVirtualAsWritten()) 702 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 703 if (WrittenVirtual != Method) 704 Diag(WrittenVirtual->getLocation(), 705 diag::note_overridden_virtual_function); 706 return false; 707 } 708 709 // - its return type shall be a literal type; 710 QualType RT = NewFD->getResultType(); 711 if (!RT->isDependentType() && 712 RequireLiteralType(NewFD->getLocation(), RT, 713 PDiag(diag::err_constexpr_non_literal_return))) 714 return false; 715 } 716 717 // - each of its parameter types shall be a literal type; 718 if (!CheckConstexprParameterTypes(*this, NewFD)) 719 return false; 720 721 return true; 722} 723 724/// Check the given declaration statement is legal within a constexpr function 725/// body. C++0x [dcl.constexpr]p3,p4. 726/// 727/// \return true if the body is OK, false if we have diagnosed a problem. 728static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 729 DeclStmt *DS) { 730 // C++0x [dcl.constexpr]p3 and p4: 731 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 732 // contain only 733 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 734 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 735 switch ((*DclIt)->getKind()) { 736 case Decl::StaticAssert: 737 case Decl::Using: 738 case Decl::UsingShadow: 739 case Decl::UsingDirective: 740 case Decl::UnresolvedUsingTypename: 741 // - static_assert-declarations 742 // - using-declarations, 743 // - using-directives, 744 continue; 745 746 case Decl::Typedef: 747 case Decl::TypeAlias: { 748 // - typedef declarations and alias-declarations that do not define 749 // classes or enumerations, 750 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 751 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 752 // Don't allow variably-modified types in constexpr functions. 753 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 754 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 755 << TL.getSourceRange() << TL.getType() 756 << isa<CXXConstructorDecl>(Dcl); 757 return false; 758 } 759 continue; 760 } 761 762 case Decl::Enum: 763 case Decl::CXXRecord: 764 // As an extension, we allow the declaration (but not the definition) of 765 // classes and enumerations in all declarations, not just in typedef and 766 // alias declarations. 767 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 768 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 769 << isa<CXXConstructorDecl>(Dcl); 770 return false; 771 } 772 continue; 773 774 case Decl::Var: 775 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 776 << isa<CXXConstructorDecl>(Dcl); 777 return false; 778 779 default: 780 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 781 << isa<CXXConstructorDecl>(Dcl); 782 return false; 783 } 784 } 785 786 return true; 787} 788 789/// Check that the given field is initialized within a constexpr constructor. 790/// 791/// \param Dcl The constexpr constructor being checked. 792/// \param Field The field being checked. This may be a member of an anonymous 793/// struct or union nested within the class being checked. 794/// \param Inits All declarations, including anonymous struct/union members and 795/// indirect members, for which any initialization was provided. 796/// \param Diagnosed Set to true if an error is produced. 797static void CheckConstexprCtorInitializer(Sema &SemaRef, 798 const FunctionDecl *Dcl, 799 FieldDecl *Field, 800 llvm::SmallSet<Decl*, 16> &Inits, 801 bool &Diagnosed) { 802 if (Field->isUnnamedBitfield()) 803 return; 804 805 if (Field->isAnonymousStructOrUnion() && 806 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 807 return; 808 809 if (!Inits.count(Field)) { 810 if (!Diagnosed) { 811 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 812 Diagnosed = true; 813 } 814 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 815 } else if (Field->isAnonymousStructOrUnion()) { 816 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 817 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 818 I != E; ++I) 819 // If an anonymous union contains an anonymous struct of which any member 820 // is initialized, all members must be initialized. 821 if (!RD->isUnion() || Inits.count(*I)) 822 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 823 } 824} 825 826/// Check the body for the given constexpr function declaration only contains 827/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 828/// 829/// \return true if the body is OK, false if we have diagnosed a problem. 830bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 831 if (isa<CXXTryStmt>(Body)) { 832 // C++11 [dcl.constexpr]p3: 833 // The definition of a constexpr function shall satisfy the following 834 // constraints: [...] 835 // - its function-body shall be = delete, = default, or a 836 // compound-statement 837 // 838 // C++11 [dcl.constexpr]p4: 839 // In the definition of a constexpr constructor, [...] 840 // - its function-body shall not be a function-try-block; 841 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 842 << isa<CXXConstructorDecl>(Dcl); 843 return false; 844 } 845 846 // - its function-body shall be [...] a compound-statement that contains only 847 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 848 849 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 850 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 851 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 852 switch ((*BodyIt)->getStmtClass()) { 853 case Stmt::NullStmtClass: 854 // - null statements, 855 continue; 856 857 case Stmt::DeclStmtClass: 858 // - static_assert-declarations 859 // - using-declarations, 860 // - using-directives, 861 // - typedef declarations and alias-declarations that do not define 862 // classes or enumerations, 863 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 864 return false; 865 continue; 866 867 case Stmt::ReturnStmtClass: 868 // - and exactly one return statement; 869 if (isa<CXXConstructorDecl>(Dcl)) 870 break; 871 872 ReturnStmts.push_back((*BodyIt)->getLocStart()); 873 continue; 874 875 default: 876 break; 877 } 878 879 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 880 << isa<CXXConstructorDecl>(Dcl); 881 return false; 882 } 883 884 if (const CXXConstructorDecl *Constructor 885 = dyn_cast<CXXConstructorDecl>(Dcl)) { 886 const CXXRecordDecl *RD = Constructor->getParent(); 887 // DR1359: 888 // - every non-variant non-static data member and base class sub-object 889 // shall be initialized; 890 // - if the class is a non-empty union, or for each non-empty anonymous 891 // union member of a non-union class, exactly one non-static data member 892 // shall be initialized; 893 if (RD->isUnion()) { 894 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 895 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 896 return false; 897 } 898 } else if (!Constructor->isDependentContext() && 899 !Constructor->isDelegatingConstructor()) { 900 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 901 902 // Skip detailed checking if we have enough initializers, and we would 903 // allow at most one initializer per member. 904 bool AnyAnonStructUnionMembers = false; 905 unsigned Fields = 0; 906 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 907 E = RD->field_end(); I != E; ++I, ++Fields) { 908 if ((*I)->isAnonymousStructOrUnion()) { 909 AnyAnonStructUnionMembers = true; 910 break; 911 } 912 } 913 if (AnyAnonStructUnionMembers || 914 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 915 // Check initialization of non-static data members. Base classes are 916 // always initialized so do not need to be checked. Dependent bases 917 // might not have initializers in the member initializer list. 918 llvm::SmallSet<Decl*, 16> Inits; 919 for (CXXConstructorDecl::init_const_iterator 920 I = Constructor->init_begin(), E = Constructor->init_end(); 921 I != E; ++I) { 922 if (FieldDecl *FD = (*I)->getMember()) 923 Inits.insert(FD); 924 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 925 Inits.insert(ID->chain_begin(), ID->chain_end()); 926 } 927 928 bool Diagnosed = false; 929 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 930 E = RD->field_end(); I != E; ++I) 931 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 932 if (Diagnosed) 933 return false; 934 } 935 } 936 } else { 937 if (ReturnStmts.empty()) { 938 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 939 return false; 940 } 941 if (ReturnStmts.size() > 1) { 942 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 943 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 944 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 945 return false; 946 } 947 } 948 949 // C++11 [dcl.constexpr]p5: 950 // if no function argument values exist such that the function invocation 951 // substitution would produce a constant expression, the program is 952 // ill-formed; no diagnostic required. 953 // C++11 [dcl.constexpr]p3: 954 // - every constructor call and implicit conversion used in initializing the 955 // return value shall be one of those allowed in a constant expression. 956 // C++11 [dcl.constexpr]p4: 957 // - every constructor involved in initializing non-static data members and 958 // base class sub-objects shall be a constexpr constructor. 959 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 960 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 961 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 962 << isa<CXXConstructorDecl>(Dcl); 963 for (size_t I = 0, N = Diags.size(); I != N; ++I) 964 Diag(Diags[I].first, Diags[I].second); 965 return false; 966 } 967 968 return true; 969} 970 971/// isCurrentClassName - Determine whether the identifier II is the 972/// name of the class type currently being defined. In the case of 973/// nested classes, this will only return true if II is the name of 974/// the innermost class. 975bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 976 const CXXScopeSpec *SS) { 977 assert(getLangOptions().CPlusPlus && "No class names in C!"); 978 979 CXXRecordDecl *CurDecl; 980 if (SS && SS->isSet() && !SS->isInvalid()) { 981 DeclContext *DC = computeDeclContext(*SS, true); 982 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 983 } else 984 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 985 986 if (CurDecl && CurDecl->getIdentifier()) 987 return &II == CurDecl->getIdentifier(); 988 else 989 return false; 990} 991 992/// \brief Check the validity of a C++ base class specifier. 993/// 994/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 995/// and returns NULL otherwise. 996CXXBaseSpecifier * 997Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 998 SourceRange SpecifierRange, 999 bool Virtual, AccessSpecifier Access, 1000 TypeSourceInfo *TInfo, 1001 SourceLocation EllipsisLoc) { 1002 QualType BaseType = TInfo->getType(); 1003 1004 // C++ [class.union]p1: 1005 // A union shall not have base classes. 1006 if (Class->isUnion()) { 1007 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1008 << SpecifierRange; 1009 return 0; 1010 } 1011 1012 if (EllipsisLoc.isValid() && 1013 !TInfo->getType()->containsUnexpandedParameterPack()) { 1014 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1015 << TInfo->getTypeLoc().getSourceRange(); 1016 EllipsisLoc = SourceLocation(); 1017 } 1018 1019 if (BaseType->isDependentType()) 1020 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1021 Class->getTagKind() == TTK_Class, 1022 Access, TInfo, EllipsisLoc); 1023 1024 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1025 1026 // Base specifiers must be record types. 1027 if (!BaseType->isRecordType()) { 1028 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1029 return 0; 1030 } 1031 1032 // C++ [class.union]p1: 1033 // A union shall not be used as a base class. 1034 if (BaseType->isUnionType()) { 1035 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1036 return 0; 1037 } 1038 1039 // C++ [class.derived]p2: 1040 // The class-name in a base-specifier shall not be an incompletely 1041 // defined class. 1042 if (RequireCompleteType(BaseLoc, BaseType, 1043 PDiag(diag::err_incomplete_base_class) 1044 << SpecifierRange)) { 1045 Class->setInvalidDecl(); 1046 return 0; 1047 } 1048 1049 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1050 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1051 assert(BaseDecl && "Record type has no declaration"); 1052 BaseDecl = BaseDecl->getDefinition(); 1053 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1054 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1055 assert(CXXBaseDecl && "Base type is not a C++ type"); 1056 1057 // C++ [class]p3: 1058 // If a class is marked final and it appears as a base-type-specifier in 1059 // base-clause, the program is ill-formed. 1060 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1061 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1062 << CXXBaseDecl->getDeclName(); 1063 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1064 << CXXBaseDecl->getDeclName(); 1065 return 0; 1066 } 1067 1068 if (BaseDecl->isInvalidDecl()) 1069 Class->setInvalidDecl(); 1070 1071 // Create the base specifier. 1072 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1073 Class->getTagKind() == TTK_Class, 1074 Access, TInfo, EllipsisLoc); 1075} 1076 1077/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1078/// one entry in the base class list of a class specifier, for 1079/// example: 1080/// class foo : public bar, virtual private baz { 1081/// 'public bar' and 'virtual private baz' are each base-specifiers. 1082BaseResult 1083Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1084 bool Virtual, AccessSpecifier Access, 1085 ParsedType basetype, SourceLocation BaseLoc, 1086 SourceLocation EllipsisLoc) { 1087 if (!classdecl) 1088 return true; 1089 1090 AdjustDeclIfTemplate(classdecl); 1091 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1092 if (!Class) 1093 return true; 1094 1095 TypeSourceInfo *TInfo = 0; 1096 GetTypeFromParser(basetype, &TInfo); 1097 1098 if (EllipsisLoc.isInvalid() && 1099 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1100 UPPC_BaseType)) 1101 return true; 1102 1103 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1104 Virtual, Access, TInfo, 1105 EllipsisLoc)) 1106 return BaseSpec; 1107 1108 return true; 1109} 1110 1111/// \brief Performs the actual work of attaching the given base class 1112/// specifiers to a C++ class. 1113bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1114 unsigned NumBases) { 1115 if (NumBases == 0) 1116 return false; 1117 1118 // Used to keep track of which base types we have already seen, so 1119 // that we can properly diagnose redundant direct base types. Note 1120 // that the key is always the unqualified canonical type of the base 1121 // class. 1122 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1123 1124 // Copy non-redundant base specifiers into permanent storage. 1125 unsigned NumGoodBases = 0; 1126 bool Invalid = false; 1127 for (unsigned idx = 0; idx < NumBases; ++idx) { 1128 QualType NewBaseType 1129 = Context.getCanonicalType(Bases[idx]->getType()); 1130 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1131 if (KnownBaseTypes[NewBaseType]) { 1132 // C++ [class.mi]p3: 1133 // A class shall not be specified as a direct base class of a 1134 // derived class more than once. 1135 Diag(Bases[idx]->getSourceRange().getBegin(), 1136 diag::err_duplicate_base_class) 1137 << KnownBaseTypes[NewBaseType]->getType() 1138 << Bases[idx]->getSourceRange(); 1139 1140 // Delete the duplicate base class specifier; we're going to 1141 // overwrite its pointer later. 1142 Context.Deallocate(Bases[idx]); 1143 1144 Invalid = true; 1145 } else { 1146 // Okay, add this new base class. 1147 KnownBaseTypes[NewBaseType] = Bases[idx]; 1148 Bases[NumGoodBases++] = Bases[idx]; 1149 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1150 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1151 if (RD->hasAttr<WeakAttr>()) 1152 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1153 } 1154 } 1155 1156 // Attach the remaining base class specifiers to the derived class. 1157 Class->setBases(Bases, NumGoodBases); 1158 1159 // Delete the remaining (good) base class specifiers, since their 1160 // data has been copied into the CXXRecordDecl. 1161 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1162 Context.Deallocate(Bases[idx]); 1163 1164 return Invalid; 1165} 1166 1167/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1168/// class, after checking whether there are any duplicate base 1169/// classes. 1170void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1171 unsigned NumBases) { 1172 if (!ClassDecl || !Bases || !NumBases) 1173 return; 1174 1175 AdjustDeclIfTemplate(ClassDecl); 1176 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1177 (CXXBaseSpecifier**)(Bases), NumBases); 1178} 1179 1180static CXXRecordDecl *GetClassForType(QualType T) { 1181 if (const RecordType *RT = T->getAs<RecordType>()) 1182 return cast<CXXRecordDecl>(RT->getDecl()); 1183 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1184 return ICT->getDecl(); 1185 else 1186 return 0; 1187} 1188 1189/// \brief Determine whether the type \p Derived is a C++ class that is 1190/// derived from the type \p Base. 1191bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1192 if (!getLangOptions().CPlusPlus) 1193 return false; 1194 1195 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1196 if (!DerivedRD) 1197 return false; 1198 1199 CXXRecordDecl *BaseRD = GetClassForType(Base); 1200 if (!BaseRD) 1201 return false; 1202 1203 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1204 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1205} 1206 1207/// \brief Determine whether the type \p Derived is a C++ class that is 1208/// derived from the type \p Base. 1209bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1210 if (!getLangOptions().CPlusPlus) 1211 return false; 1212 1213 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1214 if (!DerivedRD) 1215 return false; 1216 1217 CXXRecordDecl *BaseRD = GetClassForType(Base); 1218 if (!BaseRD) 1219 return false; 1220 1221 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1222} 1223 1224void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1225 CXXCastPath &BasePathArray) { 1226 assert(BasePathArray.empty() && "Base path array must be empty!"); 1227 assert(Paths.isRecordingPaths() && "Must record paths!"); 1228 1229 const CXXBasePath &Path = Paths.front(); 1230 1231 // We first go backward and check if we have a virtual base. 1232 // FIXME: It would be better if CXXBasePath had the base specifier for 1233 // the nearest virtual base. 1234 unsigned Start = 0; 1235 for (unsigned I = Path.size(); I != 0; --I) { 1236 if (Path[I - 1].Base->isVirtual()) { 1237 Start = I - 1; 1238 break; 1239 } 1240 } 1241 1242 // Now add all bases. 1243 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1244 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1245} 1246 1247/// \brief Determine whether the given base path includes a virtual 1248/// base class. 1249bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1250 for (CXXCastPath::const_iterator B = BasePath.begin(), 1251 BEnd = BasePath.end(); 1252 B != BEnd; ++B) 1253 if ((*B)->isVirtual()) 1254 return true; 1255 1256 return false; 1257} 1258 1259/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1260/// conversion (where Derived and Base are class types) is 1261/// well-formed, meaning that the conversion is unambiguous (and 1262/// that all of the base classes are accessible). Returns true 1263/// and emits a diagnostic if the code is ill-formed, returns false 1264/// otherwise. Loc is the location where this routine should point to 1265/// if there is an error, and Range is the source range to highlight 1266/// if there is an error. 1267bool 1268Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1269 unsigned InaccessibleBaseID, 1270 unsigned AmbigiousBaseConvID, 1271 SourceLocation Loc, SourceRange Range, 1272 DeclarationName Name, 1273 CXXCastPath *BasePath) { 1274 // First, determine whether the path from Derived to Base is 1275 // ambiguous. This is slightly more expensive than checking whether 1276 // the Derived to Base conversion exists, because here we need to 1277 // explore multiple paths to determine if there is an ambiguity. 1278 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1279 /*DetectVirtual=*/false); 1280 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1281 assert(DerivationOkay && 1282 "Can only be used with a derived-to-base conversion"); 1283 (void)DerivationOkay; 1284 1285 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1286 if (InaccessibleBaseID) { 1287 // Check that the base class can be accessed. 1288 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1289 InaccessibleBaseID)) { 1290 case AR_inaccessible: 1291 return true; 1292 case AR_accessible: 1293 case AR_dependent: 1294 case AR_delayed: 1295 break; 1296 } 1297 } 1298 1299 // Build a base path if necessary. 1300 if (BasePath) 1301 BuildBasePathArray(Paths, *BasePath); 1302 return false; 1303 } 1304 1305 // We know that the derived-to-base conversion is ambiguous, and 1306 // we're going to produce a diagnostic. Perform the derived-to-base 1307 // search just one more time to compute all of the possible paths so 1308 // that we can print them out. This is more expensive than any of 1309 // the previous derived-to-base checks we've done, but at this point 1310 // performance isn't as much of an issue. 1311 Paths.clear(); 1312 Paths.setRecordingPaths(true); 1313 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1314 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1315 (void)StillOkay; 1316 1317 // Build up a textual representation of the ambiguous paths, e.g., 1318 // D -> B -> A, that will be used to illustrate the ambiguous 1319 // conversions in the diagnostic. We only print one of the paths 1320 // to each base class subobject. 1321 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1322 1323 Diag(Loc, AmbigiousBaseConvID) 1324 << Derived << Base << PathDisplayStr << Range << Name; 1325 return true; 1326} 1327 1328bool 1329Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1330 SourceLocation Loc, SourceRange Range, 1331 CXXCastPath *BasePath, 1332 bool IgnoreAccess) { 1333 return CheckDerivedToBaseConversion(Derived, Base, 1334 IgnoreAccess ? 0 1335 : diag::err_upcast_to_inaccessible_base, 1336 diag::err_ambiguous_derived_to_base_conv, 1337 Loc, Range, DeclarationName(), 1338 BasePath); 1339} 1340 1341 1342/// @brief Builds a string representing ambiguous paths from a 1343/// specific derived class to different subobjects of the same base 1344/// class. 1345/// 1346/// This function builds a string that can be used in error messages 1347/// to show the different paths that one can take through the 1348/// inheritance hierarchy to go from the derived class to different 1349/// subobjects of a base class. The result looks something like this: 1350/// @code 1351/// struct D -> struct B -> struct A 1352/// struct D -> struct C -> struct A 1353/// @endcode 1354std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1355 std::string PathDisplayStr; 1356 std::set<unsigned> DisplayedPaths; 1357 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1358 Path != Paths.end(); ++Path) { 1359 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1360 // We haven't displayed a path to this particular base 1361 // class subobject yet. 1362 PathDisplayStr += "\n "; 1363 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1364 for (CXXBasePath::const_iterator Element = Path->begin(); 1365 Element != Path->end(); ++Element) 1366 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1367 } 1368 } 1369 1370 return PathDisplayStr; 1371} 1372 1373//===----------------------------------------------------------------------===// 1374// C++ class member Handling 1375//===----------------------------------------------------------------------===// 1376 1377/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1378bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1379 SourceLocation ASLoc, 1380 SourceLocation ColonLoc, 1381 AttributeList *Attrs) { 1382 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1383 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1384 ASLoc, ColonLoc); 1385 CurContext->addHiddenDecl(ASDecl); 1386 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1387} 1388 1389/// CheckOverrideControl - Check C++0x override control semantics. 1390void Sema::CheckOverrideControl(const Decl *D) { 1391 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1392 if (!MD || !MD->isVirtual()) 1393 return; 1394 1395 if (MD->isDependentContext()) 1396 return; 1397 1398 // C++0x [class.virtual]p3: 1399 // If a virtual function is marked with the virt-specifier override and does 1400 // not override a member function of a base class, 1401 // the program is ill-formed. 1402 bool HasOverriddenMethods = 1403 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1404 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1405 Diag(MD->getLocation(), 1406 diag::err_function_marked_override_not_overriding) 1407 << MD->getDeclName(); 1408 return; 1409 } 1410} 1411 1412/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1413/// function overrides a virtual member function marked 'final', according to 1414/// C++0x [class.virtual]p3. 1415bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1416 const CXXMethodDecl *Old) { 1417 if (!Old->hasAttr<FinalAttr>()) 1418 return false; 1419 1420 Diag(New->getLocation(), diag::err_final_function_overridden) 1421 << New->getDeclName(); 1422 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1423 return true; 1424} 1425 1426/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1427/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1428/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1429/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1430/// present but parsing it has been deferred. 1431Decl * 1432Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1433 MultiTemplateParamsArg TemplateParameterLists, 1434 Expr *BW, const VirtSpecifiers &VS, 1435 bool HasDeferredInit) { 1436 const DeclSpec &DS = D.getDeclSpec(); 1437 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1438 DeclarationName Name = NameInfo.getName(); 1439 SourceLocation Loc = NameInfo.getLoc(); 1440 1441 // For anonymous bitfields, the location should point to the type. 1442 if (Loc.isInvalid()) 1443 Loc = D.getSourceRange().getBegin(); 1444 1445 Expr *BitWidth = static_cast<Expr*>(BW); 1446 1447 assert(isa<CXXRecordDecl>(CurContext)); 1448 assert(!DS.isFriendSpecified()); 1449 1450 bool isFunc = D.isDeclarationOfFunction(); 1451 1452 // C++ 9.2p6: A member shall not be declared to have automatic storage 1453 // duration (auto, register) or with the extern storage-class-specifier. 1454 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1455 // data members and cannot be applied to names declared const or static, 1456 // and cannot be applied to reference members. 1457 switch (DS.getStorageClassSpec()) { 1458 case DeclSpec::SCS_unspecified: 1459 case DeclSpec::SCS_typedef: 1460 case DeclSpec::SCS_static: 1461 // FALL THROUGH. 1462 break; 1463 case DeclSpec::SCS_mutable: 1464 if (isFunc) { 1465 if (DS.getStorageClassSpecLoc().isValid()) 1466 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1467 else 1468 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1469 1470 // FIXME: It would be nicer if the keyword was ignored only for this 1471 // declarator. Otherwise we could get follow-up errors. 1472 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1473 } 1474 break; 1475 default: 1476 if (DS.getStorageClassSpecLoc().isValid()) 1477 Diag(DS.getStorageClassSpecLoc(), 1478 diag::err_storageclass_invalid_for_member); 1479 else 1480 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1481 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1482 } 1483 1484 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1485 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1486 !isFunc); 1487 1488 Decl *Member; 1489 if (isInstField) { 1490 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1491 1492 // Data members must have identifiers for names. 1493 if (Name.getNameKind() != DeclarationName::Identifier) { 1494 Diag(Loc, diag::err_bad_variable_name) 1495 << Name; 1496 return 0; 1497 } 1498 1499 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1500 1501 // Member field could not be with "template" keyword. 1502 // So TemplateParameterLists should be empty in this case. 1503 if (TemplateParameterLists.size()) { 1504 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1505 if (TemplateParams->size()) { 1506 // There is no such thing as a member field template. 1507 Diag(D.getIdentifierLoc(), diag::err_template_member) 1508 << II 1509 << SourceRange(TemplateParams->getTemplateLoc(), 1510 TemplateParams->getRAngleLoc()); 1511 } else { 1512 // There is an extraneous 'template<>' for this member. 1513 Diag(TemplateParams->getTemplateLoc(), 1514 diag::err_template_member_noparams) 1515 << II 1516 << SourceRange(TemplateParams->getTemplateLoc(), 1517 TemplateParams->getRAngleLoc()); 1518 } 1519 return 0; 1520 } 1521 1522 if (SS.isSet() && !SS.isInvalid()) { 1523 // The user provided a superfluous scope specifier inside a class 1524 // definition: 1525 // 1526 // class X { 1527 // int X::member; 1528 // }; 1529 DeclContext *DC = 0; 1530 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1531 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1532 << Name << FixItHint::CreateRemoval(SS.getRange()); 1533 else 1534 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1535 << Name << SS.getRange(); 1536 1537 SS.clear(); 1538 } 1539 1540 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1541 HasDeferredInit, AS); 1542 assert(Member && "HandleField never returns null"); 1543 } else { 1544 assert(!HasDeferredInit); 1545 1546 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1547 if (!Member) { 1548 return 0; 1549 } 1550 1551 // Non-instance-fields can't have a bitfield. 1552 if (BitWidth) { 1553 if (Member->isInvalidDecl()) { 1554 // don't emit another diagnostic. 1555 } else if (isa<VarDecl>(Member)) { 1556 // C++ 9.6p3: A bit-field shall not be a static member. 1557 // "static member 'A' cannot be a bit-field" 1558 Diag(Loc, diag::err_static_not_bitfield) 1559 << Name << BitWidth->getSourceRange(); 1560 } else if (isa<TypedefDecl>(Member)) { 1561 // "typedef member 'x' cannot be a bit-field" 1562 Diag(Loc, diag::err_typedef_not_bitfield) 1563 << Name << BitWidth->getSourceRange(); 1564 } else { 1565 // A function typedef ("typedef int f(); f a;"). 1566 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1567 Diag(Loc, diag::err_not_integral_type_bitfield) 1568 << Name << cast<ValueDecl>(Member)->getType() 1569 << BitWidth->getSourceRange(); 1570 } 1571 1572 BitWidth = 0; 1573 Member->setInvalidDecl(); 1574 } 1575 1576 Member->setAccess(AS); 1577 1578 // If we have declared a member function template, set the access of the 1579 // templated declaration as well. 1580 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1581 FunTmpl->getTemplatedDecl()->setAccess(AS); 1582 } 1583 1584 if (VS.isOverrideSpecified()) { 1585 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1586 if (!MD || !MD->isVirtual()) { 1587 Diag(Member->getLocStart(), 1588 diag::override_keyword_only_allowed_on_virtual_member_functions) 1589 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1590 } else 1591 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1592 } 1593 if (VS.isFinalSpecified()) { 1594 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1595 if (!MD || !MD->isVirtual()) { 1596 Diag(Member->getLocStart(), 1597 diag::override_keyword_only_allowed_on_virtual_member_functions) 1598 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1599 } else 1600 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1601 } 1602 1603 if (VS.getLastLocation().isValid()) { 1604 // Update the end location of a method that has a virt-specifiers. 1605 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1606 MD->setRangeEnd(VS.getLastLocation()); 1607 } 1608 1609 CheckOverrideControl(Member); 1610 1611 assert((Name || isInstField) && "No identifier for non-field ?"); 1612 1613 if (isInstField) 1614 FieldCollector->Add(cast<FieldDecl>(Member)); 1615 return Member; 1616} 1617 1618/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1619/// in-class initializer for a non-static C++ class member, and after 1620/// instantiating an in-class initializer in a class template. Such actions 1621/// are deferred until the class is complete. 1622void 1623Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1624 Expr *InitExpr) { 1625 FieldDecl *FD = cast<FieldDecl>(D); 1626 1627 if (!InitExpr) { 1628 FD->setInvalidDecl(); 1629 FD->removeInClassInitializer(); 1630 return; 1631 } 1632 1633 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1634 FD->setInvalidDecl(); 1635 FD->removeInClassInitializer(); 1636 return; 1637 } 1638 1639 ExprResult Init = InitExpr; 1640 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1641 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1642 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1643 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1644 } 1645 Expr **Inits = &InitExpr; 1646 unsigned NumInits = 1; 1647 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1648 InitializationKind Kind = EqualLoc.isInvalid() 1649 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1650 : InitializationKind::CreateCopy(InitExpr->getLocStart(), EqualLoc); 1651 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1652 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1653 if (Init.isInvalid()) { 1654 FD->setInvalidDecl(); 1655 return; 1656 } 1657 1658 CheckImplicitConversions(Init.get(), EqualLoc); 1659 } 1660 1661 // C++0x [class.base.init]p7: 1662 // The initialization of each base and member constitutes a 1663 // full-expression. 1664 Init = MaybeCreateExprWithCleanups(Init); 1665 if (Init.isInvalid()) { 1666 FD->setInvalidDecl(); 1667 return; 1668 } 1669 1670 InitExpr = Init.release(); 1671 1672 FD->setInClassInitializer(InitExpr); 1673} 1674 1675/// \brief Find the direct and/or virtual base specifiers that 1676/// correspond to the given base type, for use in base initialization 1677/// within a constructor. 1678static bool FindBaseInitializer(Sema &SemaRef, 1679 CXXRecordDecl *ClassDecl, 1680 QualType BaseType, 1681 const CXXBaseSpecifier *&DirectBaseSpec, 1682 const CXXBaseSpecifier *&VirtualBaseSpec) { 1683 // First, check for a direct base class. 1684 DirectBaseSpec = 0; 1685 for (CXXRecordDecl::base_class_const_iterator Base 1686 = ClassDecl->bases_begin(); 1687 Base != ClassDecl->bases_end(); ++Base) { 1688 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1689 // We found a direct base of this type. That's what we're 1690 // initializing. 1691 DirectBaseSpec = &*Base; 1692 break; 1693 } 1694 } 1695 1696 // Check for a virtual base class. 1697 // FIXME: We might be able to short-circuit this if we know in advance that 1698 // there are no virtual bases. 1699 VirtualBaseSpec = 0; 1700 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1701 // We haven't found a base yet; search the class hierarchy for a 1702 // virtual base class. 1703 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1704 /*DetectVirtual=*/false); 1705 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1706 BaseType, Paths)) { 1707 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1708 Path != Paths.end(); ++Path) { 1709 if (Path->back().Base->isVirtual()) { 1710 VirtualBaseSpec = Path->back().Base; 1711 break; 1712 } 1713 } 1714 } 1715 } 1716 1717 return DirectBaseSpec || VirtualBaseSpec; 1718} 1719 1720/// \brief Handle a C++ member initializer using braced-init-list syntax. 1721MemInitResult 1722Sema::ActOnMemInitializer(Decl *ConstructorD, 1723 Scope *S, 1724 CXXScopeSpec &SS, 1725 IdentifierInfo *MemberOrBase, 1726 ParsedType TemplateTypeTy, 1727 const DeclSpec &DS, 1728 SourceLocation IdLoc, 1729 Expr *InitList, 1730 SourceLocation EllipsisLoc) { 1731 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1732 DS, IdLoc, InitList, 1733 EllipsisLoc); 1734} 1735 1736/// \brief Handle a C++ member initializer using parentheses syntax. 1737MemInitResult 1738Sema::ActOnMemInitializer(Decl *ConstructorD, 1739 Scope *S, 1740 CXXScopeSpec &SS, 1741 IdentifierInfo *MemberOrBase, 1742 ParsedType TemplateTypeTy, 1743 const DeclSpec &DS, 1744 SourceLocation IdLoc, 1745 SourceLocation LParenLoc, 1746 Expr **Args, unsigned NumArgs, 1747 SourceLocation RParenLoc, 1748 SourceLocation EllipsisLoc) { 1749 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1750 RParenLoc); 1751 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1752 DS, IdLoc, List, EllipsisLoc); 1753} 1754 1755namespace { 1756 1757// Callback to only accept typo corrections that can be a valid C++ member 1758// intializer: either a non-static field member or a base class. 1759class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1760 public: 1761 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1762 : ClassDecl(ClassDecl) {} 1763 1764 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1765 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1766 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1767 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1768 else 1769 return isa<TypeDecl>(ND); 1770 } 1771 return false; 1772 } 1773 1774 private: 1775 CXXRecordDecl *ClassDecl; 1776}; 1777 1778} 1779 1780/// \brief Handle a C++ member initializer. 1781MemInitResult 1782Sema::BuildMemInitializer(Decl *ConstructorD, 1783 Scope *S, 1784 CXXScopeSpec &SS, 1785 IdentifierInfo *MemberOrBase, 1786 ParsedType TemplateTypeTy, 1787 const DeclSpec &DS, 1788 SourceLocation IdLoc, 1789 Expr *Init, 1790 SourceLocation EllipsisLoc) { 1791 if (!ConstructorD) 1792 return true; 1793 1794 AdjustDeclIfTemplate(ConstructorD); 1795 1796 CXXConstructorDecl *Constructor 1797 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1798 if (!Constructor) { 1799 // The user wrote a constructor initializer on a function that is 1800 // not a C++ constructor. Ignore the error for now, because we may 1801 // have more member initializers coming; we'll diagnose it just 1802 // once in ActOnMemInitializers. 1803 return true; 1804 } 1805 1806 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1807 1808 // C++ [class.base.init]p2: 1809 // Names in a mem-initializer-id are looked up in the scope of the 1810 // constructor's class and, if not found in that scope, are looked 1811 // up in the scope containing the constructor's definition. 1812 // [Note: if the constructor's class contains a member with the 1813 // same name as a direct or virtual base class of the class, a 1814 // mem-initializer-id naming the member or base class and composed 1815 // of a single identifier refers to the class member. A 1816 // mem-initializer-id for the hidden base class may be specified 1817 // using a qualified name. ] 1818 if (!SS.getScopeRep() && !TemplateTypeTy) { 1819 // Look for a member, first. 1820 DeclContext::lookup_result Result 1821 = ClassDecl->lookup(MemberOrBase); 1822 if (Result.first != Result.second) { 1823 ValueDecl *Member; 1824 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1825 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1826 if (EllipsisLoc.isValid()) 1827 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1828 << MemberOrBase 1829 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1830 1831 return BuildMemberInitializer(Member, Init, IdLoc); 1832 } 1833 } 1834 } 1835 // It didn't name a member, so see if it names a class. 1836 QualType BaseType; 1837 TypeSourceInfo *TInfo = 0; 1838 1839 if (TemplateTypeTy) { 1840 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1841 } else if (DS.getTypeSpecType() == TST_decltype) { 1842 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1843 } else { 1844 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1845 LookupParsedName(R, S, &SS); 1846 1847 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1848 if (!TyD) { 1849 if (R.isAmbiguous()) return true; 1850 1851 // We don't want access-control diagnostics here. 1852 R.suppressDiagnostics(); 1853 1854 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1855 bool NotUnknownSpecialization = false; 1856 DeclContext *DC = computeDeclContext(SS, false); 1857 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1858 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1859 1860 if (!NotUnknownSpecialization) { 1861 // When the scope specifier can refer to a member of an unknown 1862 // specialization, we take it as a type name. 1863 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1864 SS.getWithLocInContext(Context), 1865 *MemberOrBase, IdLoc); 1866 if (BaseType.isNull()) 1867 return true; 1868 1869 R.clear(); 1870 R.setLookupName(MemberOrBase); 1871 } 1872 } 1873 1874 // If no results were found, try to correct typos. 1875 TypoCorrection Corr; 1876 MemInitializerValidatorCCC Validator(ClassDecl); 1877 if (R.empty() && BaseType.isNull() && 1878 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1879 Validator, ClassDecl))) { 1880 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1881 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1882 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1883 // We have found a non-static data member with a similar 1884 // name to what was typed; complain and initialize that 1885 // member. 1886 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1887 << MemberOrBase << true << CorrectedQuotedStr 1888 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1889 Diag(Member->getLocation(), diag::note_previous_decl) 1890 << CorrectedQuotedStr; 1891 1892 return BuildMemberInitializer(Member, Init, IdLoc); 1893 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1894 const CXXBaseSpecifier *DirectBaseSpec; 1895 const CXXBaseSpecifier *VirtualBaseSpec; 1896 if (FindBaseInitializer(*this, ClassDecl, 1897 Context.getTypeDeclType(Type), 1898 DirectBaseSpec, VirtualBaseSpec)) { 1899 // We have found a direct or virtual base class with a 1900 // similar name to what was typed; complain and initialize 1901 // that base class. 1902 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1903 << MemberOrBase << false << CorrectedQuotedStr 1904 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1905 1906 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1907 : VirtualBaseSpec; 1908 Diag(BaseSpec->getSourceRange().getBegin(), 1909 diag::note_base_class_specified_here) 1910 << BaseSpec->getType() 1911 << BaseSpec->getSourceRange(); 1912 1913 TyD = Type; 1914 } 1915 } 1916 } 1917 1918 if (!TyD && BaseType.isNull()) { 1919 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1920 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1921 return true; 1922 } 1923 } 1924 1925 if (BaseType.isNull()) { 1926 BaseType = Context.getTypeDeclType(TyD); 1927 if (SS.isSet()) { 1928 NestedNameSpecifier *Qualifier = 1929 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1930 1931 // FIXME: preserve source range information 1932 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1933 } 1934 } 1935 } 1936 1937 if (!TInfo) 1938 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1939 1940 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 1941} 1942 1943/// Checks a member initializer expression for cases where reference (or 1944/// pointer) members are bound to by-value parameters (or their addresses). 1945static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1946 Expr *Init, 1947 SourceLocation IdLoc) { 1948 QualType MemberTy = Member->getType(); 1949 1950 // We only handle pointers and references currently. 1951 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1952 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1953 return; 1954 1955 const bool IsPointer = MemberTy->isPointerType(); 1956 if (IsPointer) { 1957 if (const UnaryOperator *Op 1958 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1959 // The only case we're worried about with pointers requires taking the 1960 // address. 1961 if (Op->getOpcode() != UO_AddrOf) 1962 return; 1963 1964 Init = Op->getSubExpr(); 1965 } else { 1966 // We only handle address-of expression initializers for pointers. 1967 return; 1968 } 1969 } 1970 1971 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1972 // Taking the address of a temporary will be diagnosed as a hard error. 1973 if (IsPointer) 1974 return; 1975 1976 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1977 << Member << Init->getSourceRange(); 1978 } else if (const DeclRefExpr *DRE 1979 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1980 // We only warn when referring to a non-reference parameter declaration. 1981 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1982 if (!Parameter || Parameter->getType()->isReferenceType()) 1983 return; 1984 1985 S.Diag(Init->getExprLoc(), 1986 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1987 : diag::warn_bind_ref_member_to_parameter) 1988 << Member << Parameter << Init->getSourceRange(); 1989 } else { 1990 // Other initializers are fine. 1991 return; 1992 } 1993 1994 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1995 << (unsigned)IsPointer; 1996} 1997 1998/// Checks an initializer expression for use of uninitialized fields, such as 1999/// containing the field that is being initialized. Returns true if there is an 2000/// uninitialized field was used an updates the SourceLocation parameter; false 2001/// otherwise. 2002static bool InitExprContainsUninitializedFields(const Stmt *S, 2003 const ValueDecl *LhsField, 2004 SourceLocation *L) { 2005 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 2006 2007 if (isa<CallExpr>(S)) { 2008 // Do not descend into function calls or constructors, as the use 2009 // of an uninitialized field may be valid. One would have to inspect 2010 // the contents of the function/ctor to determine if it is safe or not. 2011 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 2012 // may be safe, depending on what the function/ctor does. 2013 return false; 2014 } 2015 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 2016 const NamedDecl *RhsField = ME->getMemberDecl(); 2017 2018 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 2019 // The member expression points to a static data member. 2020 assert(VD->isStaticDataMember() && 2021 "Member points to non-static data member!"); 2022 (void)VD; 2023 return false; 2024 } 2025 2026 if (isa<EnumConstantDecl>(RhsField)) { 2027 // The member expression points to an enum. 2028 return false; 2029 } 2030 2031 if (RhsField == LhsField) { 2032 // Initializing a field with itself. Throw a warning. 2033 // But wait; there are exceptions! 2034 // Exception #1: The field may not belong to this record. 2035 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2036 const Expr *base = ME->getBase(); 2037 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2038 // Even though the field matches, it does not belong to this record. 2039 return false; 2040 } 2041 // None of the exceptions triggered; return true to indicate an 2042 // uninitialized field was used. 2043 *L = ME->getMemberLoc(); 2044 return true; 2045 } 2046 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2047 // sizeof/alignof doesn't reference contents, do not warn. 2048 return false; 2049 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2050 // address-of doesn't reference contents (the pointer may be dereferenced 2051 // in the same expression but it would be rare; and weird). 2052 if (UOE->getOpcode() == UO_AddrOf) 2053 return false; 2054 } 2055 for (Stmt::const_child_range it = S->children(); it; ++it) { 2056 if (!*it) { 2057 // An expression such as 'member(arg ?: "")' may trigger this. 2058 continue; 2059 } 2060 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2061 return true; 2062 } 2063 return false; 2064} 2065 2066MemInitResult 2067Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2068 SourceLocation IdLoc) { 2069 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2070 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2071 assert((DirectMember || IndirectMember) && 2072 "Member must be a FieldDecl or IndirectFieldDecl"); 2073 2074 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2075 return true; 2076 2077 if (Member->isInvalidDecl()) 2078 return true; 2079 2080 // Diagnose value-uses of fields to initialize themselves, e.g. 2081 // foo(foo) 2082 // where foo is not also a parameter to the constructor. 2083 // TODO: implement -Wuninitialized and fold this into that framework. 2084 Expr **Args; 2085 unsigned NumArgs; 2086 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2087 Args = ParenList->getExprs(); 2088 NumArgs = ParenList->getNumExprs(); 2089 } else { 2090 InitListExpr *InitList = cast<InitListExpr>(Init); 2091 Args = InitList->getInits(); 2092 NumArgs = InitList->getNumInits(); 2093 } 2094 for (unsigned i = 0; i < NumArgs; ++i) { 2095 SourceLocation L; 2096 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 2097 // FIXME: Return true in the case when other fields are used before being 2098 // uninitialized. For example, let this field be the i'th field. When 2099 // initializing the i'th field, throw a warning if any of the >= i'th 2100 // fields are used, as they are not yet initialized. 2101 // Right now we are only handling the case where the i'th field uses 2102 // itself in its initializer. 2103 Diag(L, diag::warn_field_is_uninit); 2104 } 2105 } 2106 2107 SourceRange InitRange = Init->getSourceRange(); 2108 2109 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2110 // Can't check initialization for a member of dependent type or when 2111 // any of the arguments are type-dependent expressions. 2112 DiscardCleanupsInEvaluationContext(); 2113 } else { 2114 bool InitList = false; 2115 if (isa<InitListExpr>(Init)) { 2116 InitList = true; 2117 Args = &Init; 2118 NumArgs = 1; 2119 2120 if (isStdInitializerList(Member->getType(), 0)) { 2121 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2122 << /*at end of ctor*/1 << InitRange; 2123 } 2124 } 2125 2126 // Initialize the member. 2127 InitializedEntity MemberEntity = 2128 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2129 : InitializedEntity::InitializeMember(IndirectMember, 0); 2130 InitializationKind Kind = 2131 InitList ? InitializationKind::CreateDirectList(IdLoc) 2132 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2133 InitRange.getEnd()); 2134 2135 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2136 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2137 MultiExprArg(*this, Args, NumArgs), 2138 0); 2139 if (MemberInit.isInvalid()) 2140 return true; 2141 2142 CheckImplicitConversions(MemberInit.get(), 2143 InitRange.getBegin()); 2144 2145 // C++0x [class.base.init]p7: 2146 // The initialization of each base and member constitutes a 2147 // full-expression. 2148 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2149 if (MemberInit.isInvalid()) 2150 return true; 2151 2152 // If we are in a dependent context, template instantiation will 2153 // perform this type-checking again. Just save the arguments that we 2154 // received. 2155 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2156 // of the information that we have about the member 2157 // initializer. However, deconstructing the ASTs is a dicey process, 2158 // and this approach is far more likely to get the corner cases right. 2159 if (CurContext->isDependentContext()) { 2160 // The existing Init will do fine. 2161 } else { 2162 Init = MemberInit.get(); 2163 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2164 } 2165 } 2166 2167 if (DirectMember) { 2168 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2169 InitRange.getBegin(), Init, 2170 InitRange.getEnd()); 2171 } else { 2172 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2173 InitRange.getBegin(), Init, 2174 InitRange.getEnd()); 2175 } 2176} 2177 2178MemInitResult 2179Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2180 CXXRecordDecl *ClassDecl) { 2181 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2182 if (!LangOpts.CPlusPlus0x) 2183 return Diag(NameLoc, diag::err_delegating_ctor) 2184 << TInfo->getTypeLoc().getLocalSourceRange(); 2185 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2186 2187 bool InitList = true; 2188 Expr **Args = &Init; 2189 unsigned NumArgs = 1; 2190 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2191 InitList = false; 2192 Args = ParenList->getExprs(); 2193 NumArgs = ParenList->getNumExprs(); 2194 } 2195 2196 SourceRange InitRange = Init->getSourceRange(); 2197 // Initialize the object. 2198 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2199 QualType(ClassDecl->getTypeForDecl(), 0)); 2200 InitializationKind Kind = 2201 InitList ? InitializationKind::CreateDirectList(NameLoc) 2202 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2203 InitRange.getEnd()); 2204 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2205 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2206 MultiExprArg(*this, Args,NumArgs), 2207 0); 2208 if (DelegationInit.isInvalid()) 2209 return true; 2210 2211 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2212 "Delegating constructor with no target?"); 2213 2214 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2215 2216 // C++0x [class.base.init]p7: 2217 // The initialization of each base and member constitutes a 2218 // full-expression. 2219 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2220 if (DelegationInit.isInvalid()) 2221 return true; 2222 2223 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2224 DelegationInit.takeAs<Expr>(), 2225 InitRange.getEnd()); 2226} 2227 2228MemInitResult 2229Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2230 Expr *Init, CXXRecordDecl *ClassDecl, 2231 SourceLocation EllipsisLoc) { 2232 SourceLocation BaseLoc 2233 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2234 2235 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2236 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2237 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2238 2239 // C++ [class.base.init]p2: 2240 // [...] Unless the mem-initializer-id names a nonstatic data 2241 // member of the constructor's class or a direct or virtual base 2242 // of that class, the mem-initializer is ill-formed. A 2243 // mem-initializer-list can initialize a base class using any 2244 // name that denotes that base class type. 2245 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2246 2247 SourceRange InitRange = Init->getSourceRange(); 2248 if (EllipsisLoc.isValid()) { 2249 // This is a pack expansion. 2250 if (!BaseType->containsUnexpandedParameterPack()) { 2251 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2252 << SourceRange(BaseLoc, InitRange.getEnd()); 2253 2254 EllipsisLoc = SourceLocation(); 2255 } 2256 } else { 2257 // Check for any unexpanded parameter packs. 2258 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2259 return true; 2260 2261 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2262 return true; 2263 } 2264 2265 // Check for direct and virtual base classes. 2266 const CXXBaseSpecifier *DirectBaseSpec = 0; 2267 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2268 if (!Dependent) { 2269 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2270 BaseType)) 2271 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2272 2273 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2274 VirtualBaseSpec); 2275 2276 // C++ [base.class.init]p2: 2277 // Unless the mem-initializer-id names a nonstatic data member of the 2278 // constructor's class or a direct or virtual base of that class, the 2279 // mem-initializer is ill-formed. 2280 if (!DirectBaseSpec && !VirtualBaseSpec) { 2281 // If the class has any dependent bases, then it's possible that 2282 // one of those types will resolve to the same type as 2283 // BaseType. Therefore, just treat this as a dependent base 2284 // class initialization. FIXME: Should we try to check the 2285 // initialization anyway? It seems odd. 2286 if (ClassDecl->hasAnyDependentBases()) 2287 Dependent = true; 2288 else 2289 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2290 << BaseType << Context.getTypeDeclType(ClassDecl) 2291 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2292 } 2293 } 2294 2295 if (Dependent) { 2296 DiscardCleanupsInEvaluationContext(); 2297 2298 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2299 /*IsVirtual=*/false, 2300 InitRange.getBegin(), Init, 2301 InitRange.getEnd(), EllipsisLoc); 2302 } 2303 2304 // C++ [base.class.init]p2: 2305 // If a mem-initializer-id is ambiguous because it designates both 2306 // a direct non-virtual base class and an inherited virtual base 2307 // class, the mem-initializer is ill-formed. 2308 if (DirectBaseSpec && VirtualBaseSpec) 2309 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2310 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2311 2312 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2313 if (!BaseSpec) 2314 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2315 2316 // Initialize the base. 2317 bool InitList = true; 2318 Expr **Args = &Init; 2319 unsigned NumArgs = 1; 2320 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2321 InitList = false; 2322 Args = ParenList->getExprs(); 2323 NumArgs = ParenList->getNumExprs(); 2324 } 2325 2326 InitializedEntity BaseEntity = 2327 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2328 InitializationKind Kind = 2329 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2330 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2331 InitRange.getEnd()); 2332 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2333 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2334 MultiExprArg(*this, Args, NumArgs), 2335 0); 2336 if (BaseInit.isInvalid()) 2337 return true; 2338 2339 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2340 2341 // C++0x [class.base.init]p7: 2342 // The initialization of each base and member constitutes a 2343 // full-expression. 2344 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2345 if (BaseInit.isInvalid()) 2346 return true; 2347 2348 // If we are in a dependent context, template instantiation will 2349 // perform this type-checking again. Just save the arguments that we 2350 // received in a ParenListExpr. 2351 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2352 // of the information that we have about the base 2353 // initializer. However, deconstructing the ASTs is a dicey process, 2354 // and this approach is far more likely to get the corner cases right. 2355 if (CurContext->isDependentContext()) 2356 BaseInit = Owned(Init); 2357 2358 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2359 BaseSpec->isVirtual(), 2360 InitRange.getBegin(), 2361 BaseInit.takeAs<Expr>(), 2362 InitRange.getEnd(), EllipsisLoc); 2363} 2364 2365// Create a static_cast\<T&&>(expr). 2366static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2367 QualType ExprType = E->getType(); 2368 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2369 SourceLocation ExprLoc = E->getLocStart(); 2370 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2371 TargetType, ExprLoc); 2372 2373 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2374 SourceRange(ExprLoc, ExprLoc), 2375 E->getSourceRange()).take(); 2376} 2377 2378/// ImplicitInitializerKind - How an implicit base or member initializer should 2379/// initialize its base or member. 2380enum ImplicitInitializerKind { 2381 IIK_Default, 2382 IIK_Copy, 2383 IIK_Move 2384}; 2385 2386static bool 2387BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2388 ImplicitInitializerKind ImplicitInitKind, 2389 CXXBaseSpecifier *BaseSpec, 2390 bool IsInheritedVirtualBase, 2391 CXXCtorInitializer *&CXXBaseInit) { 2392 InitializedEntity InitEntity 2393 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2394 IsInheritedVirtualBase); 2395 2396 ExprResult BaseInit; 2397 2398 switch (ImplicitInitKind) { 2399 case IIK_Default: { 2400 InitializationKind InitKind 2401 = InitializationKind::CreateDefault(Constructor->getLocation()); 2402 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2403 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2404 MultiExprArg(SemaRef, 0, 0)); 2405 break; 2406 } 2407 2408 case IIK_Move: 2409 case IIK_Copy: { 2410 bool Moving = ImplicitInitKind == IIK_Move; 2411 ParmVarDecl *Param = Constructor->getParamDecl(0); 2412 QualType ParamType = Param->getType().getNonReferenceType(); 2413 2414 Expr *CopyCtorArg = 2415 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2416 SourceLocation(), Param, 2417 Constructor->getLocation(), ParamType, 2418 VK_LValue, 0); 2419 2420 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2421 2422 // Cast to the base class to avoid ambiguities. 2423 QualType ArgTy = 2424 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2425 ParamType.getQualifiers()); 2426 2427 if (Moving) { 2428 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2429 } 2430 2431 CXXCastPath BasePath; 2432 BasePath.push_back(BaseSpec); 2433 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2434 CK_UncheckedDerivedToBase, 2435 Moving ? VK_XValue : VK_LValue, 2436 &BasePath).take(); 2437 2438 InitializationKind InitKind 2439 = InitializationKind::CreateDirect(Constructor->getLocation(), 2440 SourceLocation(), SourceLocation()); 2441 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2442 &CopyCtorArg, 1); 2443 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2444 MultiExprArg(&CopyCtorArg, 1)); 2445 break; 2446 } 2447 } 2448 2449 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2450 if (BaseInit.isInvalid()) 2451 return true; 2452 2453 CXXBaseInit = 2454 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2455 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2456 SourceLocation()), 2457 BaseSpec->isVirtual(), 2458 SourceLocation(), 2459 BaseInit.takeAs<Expr>(), 2460 SourceLocation(), 2461 SourceLocation()); 2462 2463 return false; 2464} 2465 2466static bool RefersToRValueRef(Expr *MemRef) { 2467 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2468 return Referenced->getType()->isRValueReferenceType(); 2469} 2470 2471static bool 2472BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2473 ImplicitInitializerKind ImplicitInitKind, 2474 FieldDecl *Field, IndirectFieldDecl *Indirect, 2475 CXXCtorInitializer *&CXXMemberInit) { 2476 if (Field->isInvalidDecl()) 2477 return true; 2478 2479 SourceLocation Loc = Constructor->getLocation(); 2480 2481 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2482 bool Moving = ImplicitInitKind == IIK_Move; 2483 ParmVarDecl *Param = Constructor->getParamDecl(0); 2484 QualType ParamType = Param->getType().getNonReferenceType(); 2485 2486 // Suppress copying zero-width bitfields. 2487 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2488 return false; 2489 2490 Expr *MemberExprBase = 2491 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2492 SourceLocation(), Param, 2493 Loc, ParamType, VK_LValue, 0); 2494 2495 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2496 2497 if (Moving) { 2498 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2499 } 2500 2501 // Build a reference to this field within the parameter. 2502 CXXScopeSpec SS; 2503 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2504 Sema::LookupMemberName); 2505 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2506 : cast<ValueDecl>(Field), AS_public); 2507 MemberLookup.resolveKind(); 2508 ExprResult CtorArg 2509 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2510 ParamType, Loc, 2511 /*IsArrow=*/false, 2512 SS, 2513 /*TemplateKWLoc=*/SourceLocation(), 2514 /*FirstQualifierInScope=*/0, 2515 MemberLookup, 2516 /*TemplateArgs=*/0); 2517 if (CtorArg.isInvalid()) 2518 return true; 2519 2520 // C++11 [class.copy]p15: 2521 // - if a member m has rvalue reference type T&&, it is direct-initialized 2522 // with static_cast<T&&>(x.m); 2523 if (RefersToRValueRef(CtorArg.get())) { 2524 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2525 } 2526 2527 // When the field we are copying is an array, create index variables for 2528 // each dimension of the array. We use these index variables to subscript 2529 // the source array, and other clients (e.g., CodeGen) will perform the 2530 // necessary iteration with these index variables. 2531 SmallVector<VarDecl *, 4> IndexVariables; 2532 QualType BaseType = Field->getType(); 2533 QualType SizeType = SemaRef.Context.getSizeType(); 2534 bool InitializingArray = false; 2535 while (const ConstantArrayType *Array 2536 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2537 InitializingArray = true; 2538 // Create the iteration variable for this array index. 2539 IdentifierInfo *IterationVarName = 0; 2540 { 2541 SmallString<8> Str; 2542 llvm::raw_svector_ostream OS(Str); 2543 OS << "__i" << IndexVariables.size(); 2544 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2545 } 2546 VarDecl *IterationVar 2547 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2548 IterationVarName, SizeType, 2549 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2550 SC_None, SC_None); 2551 IndexVariables.push_back(IterationVar); 2552 2553 // Create a reference to the iteration variable. 2554 ExprResult IterationVarRef 2555 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2556 assert(!IterationVarRef.isInvalid() && 2557 "Reference to invented variable cannot fail!"); 2558 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2559 assert(!IterationVarRef.isInvalid() && 2560 "Conversion of invented variable cannot fail!"); 2561 2562 // Subscript the array with this iteration variable. 2563 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2564 IterationVarRef.take(), 2565 Loc); 2566 if (CtorArg.isInvalid()) 2567 return true; 2568 2569 BaseType = Array->getElementType(); 2570 } 2571 2572 // The array subscript expression is an lvalue, which is wrong for moving. 2573 if (Moving && InitializingArray) 2574 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2575 2576 // Construct the entity that we will be initializing. For an array, this 2577 // will be first element in the array, which may require several levels 2578 // of array-subscript entities. 2579 SmallVector<InitializedEntity, 4> Entities; 2580 Entities.reserve(1 + IndexVariables.size()); 2581 if (Indirect) 2582 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2583 else 2584 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2585 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2586 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2587 0, 2588 Entities.back())); 2589 2590 // Direct-initialize to use the copy constructor. 2591 InitializationKind InitKind = 2592 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2593 2594 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2595 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2596 &CtorArgE, 1); 2597 2598 ExprResult MemberInit 2599 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2600 MultiExprArg(&CtorArgE, 1)); 2601 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2602 if (MemberInit.isInvalid()) 2603 return true; 2604 2605 if (Indirect) { 2606 assert(IndexVariables.size() == 0 && 2607 "Indirect field improperly initialized"); 2608 CXXMemberInit 2609 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2610 Loc, Loc, 2611 MemberInit.takeAs<Expr>(), 2612 Loc); 2613 } else 2614 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2615 Loc, MemberInit.takeAs<Expr>(), 2616 Loc, 2617 IndexVariables.data(), 2618 IndexVariables.size()); 2619 return false; 2620 } 2621 2622 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2623 2624 QualType FieldBaseElementType = 2625 SemaRef.Context.getBaseElementType(Field->getType()); 2626 2627 if (FieldBaseElementType->isRecordType()) { 2628 InitializedEntity InitEntity 2629 = Indirect? InitializedEntity::InitializeMember(Indirect) 2630 : InitializedEntity::InitializeMember(Field); 2631 InitializationKind InitKind = 2632 InitializationKind::CreateDefault(Loc); 2633 2634 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2635 ExprResult MemberInit = 2636 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2637 2638 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2639 if (MemberInit.isInvalid()) 2640 return true; 2641 2642 if (Indirect) 2643 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2644 Indirect, Loc, 2645 Loc, 2646 MemberInit.get(), 2647 Loc); 2648 else 2649 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2650 Field, Loc, Loc, 2651 MemberInit.get(), 2652 Loc); 2653 return false; 2654 } 2655 2656 if (!Field->getParent()->isUnion()) { 2657 if (FieldBaseElementType->isReferenceType()) { 2658 SemaRef.Diag(Constructor->getLocation(), 2659 diag::err_uninitialized_member_in_ctor) 2660 << (int)Constructor->isImplicit() 2661 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2662 << 0 << Field->getDeclName(); 2663 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2664 return true; 2665 } 2666 2667 if (FieldBaseElementType.isConstQualified()) { 2668 SemaRef.Diag(Constructor->getLocation(), 2669 diag::err_uninitialized_member_in_ctor) 2670 << (int)Constructor->isImplicit() 2671 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2672 << 1 << Field->getDeclName(); 2673 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2674 return true; 2675 } 2676 } 2677 2678 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2679 FieldBaseElementType->isObjCRetainableType() && 2680 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2681 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2682 // Instant objects: 2683 // Default-initialize Objective-C pointers to NULL. 2684 CXXMemberInit 2685 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2686 Loc, Loc, 2687 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2688 Loc); 2689 return false; 2690 } 2691 2692 // Nothing to initialize. 2693 CXXMemberInit = 0; 2694 return false; 2695} 2696 2697namespace { 2698struct BaseAndFieldInfo { 2699 Sema &S; 2700 CXXConstructorDecl *Ctor; 2701 bool AnyErrorsInInits; 2702 ImplicitInitializerKind IIK; 2703 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2704 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2705 2706 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2707 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2708 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2709 if (Generated && Ctor->isCopyConstructor()) 2710 IIK = IIK_Copy; 2711 else if (Generated && Ctor->isMoveConstructor()) 2712 IIK = IIK_Move; 2713 else 2714 IIK = IIK_Default; 2715 } 2716 2717 bool isImplicitCopyOrMove() const { 2718 switch (IIK) { 2719 case IIK_Copy: 2720 case IIK_Move: 2721 return true; 2722 2723 case IIK_Default: 2724 return false; 2725 } 2726 2727 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2728 } 2729}; 2730} 2731 2732/// \brief Determine whether the given indirect field declaration is somewhere 2733/// within an anonymous union. 2734static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2735 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2736 CEnd = F->chain_end(); 2737 C != CEnd; ++C) 2738 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2739 if (Record->isUnion()) 2740 return true; 2741 2742 return false; 2743} 2744 2745/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2746/// array type. 2747static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2748 if (T->isIncompleteArrayType()) 2749 return true; 2750 2751 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2752 if (!ArrayT->getSize()) 2753 return true; 2754 2755 T = ArrayT->getElementType(); 2756 } 2757 2758 return false; 2759} 2760 2761static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2762 FieldDecl *Field, 2763 IndirectFieldDecl *Indirect = 0) { 2764 2765 // Overwhelmingly common case: we have a direct initializer for this field. 2766 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2767 Info.AllToInit.push_back(Init); 2768 return false; 2769 } 2770 2771 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2772 // has a brace-or-equal-initializer, the entity is initialized as specified 2773 // in [dcl.init]. 2774 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2775 CXXCtorInitializer *Init; 2776 if (Indirect) 2777 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2778 SourceLocation(), 2779 SourceLocation(), 0, 2780 SourceLocation()); 2781 else 2782 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2783 SourceLocation(), 2784 SourceLocation(), 0, 2785 SourceLocation()); 2786 Info.AllToInit.push_back(Init); 2787 return false; 2788 } 2789 2790 // Don't build an implicit initializer for union members if none was 2791 // explicitly specified. 2792 if (Field->getParent()->isUnion() || 2793 (Indirect && isWithinAnonymousUnion(Indirect))) 2794 return false; 2795 2796 // Don't initialize incomplete or zero-length arrays. 2797 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2798 return false; 2799 2800 // Don't try to build an implicit initializer if there were semantic 2801 // errors in any of the initializers (and therefore we might be 2802 // missing some that the user actually wrote). 2803 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2804 return false; 2805 2806 CXXCtorInitializer *Init = 0; 2807 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2808 Indirect, Init)) 2809 return true; 2810 2811 if (Init) 2812 Info.AllToInit.push_back(Init); 2813 2814 return false; 2815} 2816 2817bool 2818Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2819 CXXCtorInitializer *Initializer) { 2820 assert(Initializer->isDelegatingInitializer()); 2821 Constructor->setNumCtorInitializers(1); 2822 CXXCtorInitializer **initializer = 2823 new (Context) CXXCtorInitializer*[1]; 2824 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2825 Constructor->setCtorInitializers(initializer); 2826 2827 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2828 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2829 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2830 } 2831 2832 DelegatingCtorDecls.push_back(Constructor); 2833 2834 return false; 2835} 2836 2837bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2838 CXXCtorInitializer **Initializers, 2839 unsigned NumInitializers, 2840 bool AnyErrors) { 2841 if (Constructor->isDependentContext()) { 2842 // Just store the initializers as written, they will be checked during 2843 // instantiation. 2844 if (NumInitializers > 0) { 2845 Constructor->setNumCtorInitializers(NumInitializers); 2846 CXXCtorInitializer **baseOrMemberInitializers = 2847 new (Context) CXXCtorInitializer*[NumInitializers]; 2848 memcpy(baseOrMemberInitializers, Initializers, 2849 NumInitializers * sizeof(CXXCtorInitializer*)); 2850 Constructor->setCtorInitializers(baseOrMemberInitializers); 2851 } 2852 2853 return false; 2854 } 2855 2856 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2857 2858 // We need to build the initializer AST according to order of construction 2859 // and not what user specified in the Initializers list. 2860 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2861 if (!ClassDecl) 2862 return true; 2863 2864 bool HadError = false; 2865 2866 for (unsigned i = 0; i < NumInitializers; i++) { 2867 CXXCtorInitializer *Member = Initializers[i]; 2868 2869 if (Member->isBaseInitializer()) 2870 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2871 else 2872 Info.AllBaseFields[Member->getAnyMember()] = Member; 2873 } 2874 2875 // Keep track of the direct virtual bases. 2876 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2877 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2878 E = ClassDecl->bases_end(); I != E; ++I) { 2879 if (I->isVirtual()) 2880 DirectVBases.insert(I); 2881 } 2882 2883 // Push virtual bases before others. 2884 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2885 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2886 2887 if (CXXCtorInitializer *Value 2888 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2889 Info.AllToInit.push_back(Value); 2890 } else if (!AnyErrors) { 2891 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2892 CXXCtorInitializer *CXXBaseInit; 2893 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2894 VBase, IsInheritedVirtualBase, 2895 CXXBaseInit)) { 2896 HadError = true; 2897 continue; 2898 } 2899 2900 Info.AllToInit.push_back(CXXBaseInit); 2901 } 2902 } 2903 2904 // Non-virtual bases. 2905 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2906 E = ClassDecl->bases_end(); Base != E; ++Base) { 2907 // Virtuals are in the virtual base list and already constructed. 2908 if (Base->isVirtual()) 2909 continue; 2910 2911 if (CXXCtorInitializer *Value 2912 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2913 Info.AllToInit.push_back(Value); 2914 } else if (!AnyErrors) { 2915 CXXCtorInitializer *CXXBaseInit; 2916 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2917 Base, /*IsInheritedVirtualBase=*/false, 2918 CXXBaseInit)) { 2919 HadError = true; 2920 continue; 2921 } 2922 2923 Info.AllToInit.push_back(CXXBaseInit); 2924 } 2925 } 2926 2927 // Fields. 2928 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2929 MemEnd = ClassDecl->decls_end(); 2930 Mem != MemEnd; ++Mem) { 2931 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2932 // C++ [class.bit]p2: 2933 // A declaration for a bit-field that omits the identifier declares an 2934 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2935 // initialized. 2936 if (F->isUnnamedBitfield()) 2937 continue; 2938 2939 // If we're not generating the implicit copy/move constructor, then we'll 2940 // handle anonymous struct/union fields based on their individual 2941 // indirect fields. 2942 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2943 continue; 2944 2945 if (CollectFieldInitializer(*this, Info, F)) 2946 HadError = true; 2947 continue; 2948 } 2949 2950 // Beyond this point, we only consider default initialization. 2951 if (Info.IIK != IIK_Default) 2952 continue; 2953 2954 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2955 if (F->getType()->isIncompleteArrayType()) { 2956 assert(ClassDecl->hasFlexibleArrayMember() && 2957 "Incomplete array type is not valid"); 2958 continue; 2959 } 2960 2961 // Initialize each field of an anonymous struct individually. 2962 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2963 HadError = true; 2964 2965 continue; 2966 } 2967 } 2968 2969 NumInitializers = Info.AllToInit.size(); 2970 if (NumInitializers > 0) { 2971 Constructor->setNumCtorInitializers(NumInitializers); 2972 CXXCtorInitializer **baseOrMemberInitializers = 2973 new (Context) CXXCtorInitializer*[NumInitializers]; 2974 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2975 NumInitializers * sizeof(CXXCtorInitializer*)); 2976 Constructor->setCtorInitializers(baseOrMemberInitializers); 2977 2978 // Constructors implicitly reference the base and member 2979 // destructors. 2980 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2981 Constructor->getParent()); 2982 } 2983 2984 return HadError; 2985} 2986 2987static void *GetKeyForTopLevelField(FieldDecl *Field) { 2988 // For anonymous unions, use the class declaration as the key. 2989 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2990 if (RT->getDecl()->isAnonymousStructOrUnion()) 2991 return static_cast<void *>(RT->getDecl()); 2992 } 2993 return static_cast<void *>(Field); 2994} 2995 2996static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2997 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2998} 2999 3000static void *GetKeyForMember(ASTContext &Context, 3001 CXXCtorInitializer *Member) { 3002 if (!Member->isAnyMemberInitializer()) 3003 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3004 3005 // For fields injected into the class via declaration of an anonymous union, 3006 // use its anonymous union class declaration as the unique key. 3007 FieldDecl *Field = Member->getAnyMember(); 3008 3009 // If the field is a member of an anonymous struct or union, our key 3010 // is the anonymous record decl that's a direct child of the class. 3011 RecordDecl *RD = Field->getParent(); 3012 if (RD->isAnonymousStructOrUnion()) { 3013 while (true) { 3014 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3015 if (Parent->isAnonymousStructOrUnion()) 3016 RD = Parent; 3017 else 3018 break; 3019 } 3020 3021 return static_cast<void *>(RD); 3022 } 3023 3024 return static_cast<void *>(Field); 3025} 3026 3027static void 3028DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3029 const CXXConstructorDecl *Constructor, 3030 CXXCtorInitializer **Inits, 3031 unsigned NumInits) { 3032 if (Constructor->getDeclContext()->isDependentContext()) 3033 return; 3034 3035 // Don't check initializers order unless the warning is enabled at the 3036 // location of at least one initializer. 3037 bool ShouldCheckOrder = false; 3038 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3039 CXXCtorInitializer *Init = Inits[InitIndex]; 3040 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3041 Init->getSourceLocation()) 3042 != DiagnosticsEngine::Ignored) { 3043 ShouldCheckOrder = true; 3044 break; 3045 } 3046 } 3047 if (!ShouldCheckOrder) 3048 return; 3049 3050 // Build the list of bases and members in the order that they'll 3051 // actually be initialized. The explicit initializers should be in 3052 // this same order but may be missing things. 3053 SmallVector<const void*, 32> IdealInitKeys; 3054 3055 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3056 3057 // 1. Virtual bases. 3058 for (CXXRecordDecl::base_class_const_iterator VBase = 3059 ClassDecl->vbases_begin(), 3060 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3061 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3062 3063 // 2. Non-virtual bases. 3064 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3065 E = ClassDecl->bases_end(); Base != E; ++Base) { 3066 if (Base->isVirtual()) 3067 continue; 3068 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3069 } 3070 3071 // 3. Direct fields. 3072 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3073 E = ClassDecl->field_end(); Field != E; ++Field) { 3074 if (Field->isUnnamedBitfield()) 3075 continue; 3076 3077 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3078 } 3079 3080 unsigned NumIdealInits = IdealInitKeys.size(); 3081 unsigned IdealIndex = 0; 3082 3083 CXXCtorInitializer *PrevInit = 0; 3084 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3085 CXXCtorInitializer *Init = Inits[InitIndex]; 3086 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3087 3088 // Scan forward to try to find this initializer in the idealized 3089 // initializers list. 3090 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3091 if (InitKey == IdealInitKeys[IdealIndex]) 3092 break; 3093 3094 // If we didn't find this initializer, it must be because we 3095 // scanned past it on a previous iteration. That can only 3096 // happen if we're out of order; emit a warning. 3097 if (IdealIndex == NumIdealInits && PrevInit) { 3098 Sema::SemaDiagnosticBuilder D = 3099 SemaRef.Diag(PrevInit->getSourceLocation(), 3100 diag::warn_initializer_out_of_order); 3101 3102 if (PrevInit->isAnyMemberInitializer()) 3103 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3104 else 3105 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3106 3107 if (Init->isAnyMemberInitializer()) 3108 D << 0 << Init->getAnyMember()->getDeclName(); 3109 else 3110 D << 1 << Init->getTypeSourceInfo()->getType(); 3111 3112 // Move back to the initializer's location in the ideal list. 3113 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3114 if (InitKey == IdealInitKeys[IdealIndex]) 3115 break; 3116 3117 assert(IdealIndex != NumIdealInits && 3118 "initializer not found in initializer list"); 3119 } 3120 3121 PrevInit = Init; 3122 } 3123} 3124 3125namespace { 3126bool CheckRedundantInit(Sema &S, 3127 CXXCtorInitializer *Init, 3128 CXXCtorInitializer *&PrevInit) { 3129 if (!PrevInit) { 3130 PrevInit = Init; 3131 return false; 3132 } 3133 3134 if (FieldDecl *Field = Init->getMember()) 3135 S.Diag(Init->getSourceLocation(), 3136 diag::err_multiple_mem_initialization) 3137 << Field->getDeclName() 3138 << Init->getSourceRange(); 3139 else { 3140 const Type *BaseClass = Init->getBaseClass(); 3141 assert(BaseClass && "neither field nor base"); 3142 S.Diag(Init->getSourceLocation(), 3143 diag::err_multiple_base_initialization) 3144 << QualType(BaseClass, 0) 3145 << Init->getSourceRange(); 3146 } 3147 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3148 << 0 << PrevInit->getSourceRange(); 3149 3150 return true; 3151} 3152 3153typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3154typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3155 3156bool CheckRedundantUnionInit(Sema &S, 3157 CXXCtorInitializer *Init, 3158 RedundantUnionMap &Unions) { 3159 FieldDecl *Field = Init->getAnyMember(); 3160 RecordDecl *Parent = Field->getParent(); 3161 NamedDecl *Child = Field; 3162 3163 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3164 if (Parent->isUnion()) { 3165 UnionEntry &En = Unions[Parent]; 3166 if (En.first && En.first != Child) { 3167 S.Diag(Init->getSourceLocation(), 3168 diag::err_multiple_mem_union_initialization) 3169 << Field->getDeclName() 3170 << Init->getSourceRange(); 3171 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3172 << 0 << En.second->getSourceRange(); 3173 return true; 3174 } 3175 if (!En.first) { 3176 En.first = Child; 3177 En.second = Init; 3178 } 3179 if (!Parent->isAnonymousStructOrUnion()) 3180 return false; 3181 } 3182 3183 Child = Parent; 3184 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3185 } 3186 3187 return false; 3188} 3189} 3190 3191/// ActOnMemInitializers - Handle the member initializers for a constructor. 3192void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3193 SourceLocation ColonLoc, 3194 CXXCtorInitializer **meminits, 3195 unsigned NumMemInits, 3196 bool AnyErrors) { 3197 if (!ConstructorDecl) 3198 return; 3199 3200 AdjustDeclIfTemplate(ConstructorDecl); 3201 3202 CXXConstructorDecl *Constructor 3203 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3204 3205 if (!Constructor) { 3206 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3207 return; 3208 } 3209 3210 CXXCtorInitializer **MemInits = 3211 reinterpret_cast<CXXCtorInitializer **>(meminits); 3212 3213 // Mapping for the duplicate initializers check. 3214 // For member initializers, this is keyed with a FieldDecl*. 3215 // For base initializers, this is keyed with a Type*. 3216 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3217 3218 // Mapping for the inconsistent anonymous-union initializers check. 3219 RedundantUnionMap MemberUnions; 3220 3221 bool HadError = false; 3222 for (unsigned i = 0; i < NumMemInits; i++) { 3223 CXXCtorInitializer *Init = MemInits[i]; 3224 3225 // Set the source order index. 3226 Init->setSourceOrder(i); 3227 3228 if (Init->isAnyMemberInitializer()) { 3229 FieldDecl *Field = Init->getAnyMember(); 3230 if (CheckRedundantInit(*this, Init, Members[Field]) || 3231 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3232 HadError = true; 3233 } else if (Init->isBaseInitializer()) { 3234 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3235 if (CheckRedundantInit(*this, Init, Members[Key])) 3236 HadError = true; 3237 } else { 3238 assert(Init->isDelegatingInitializer()); 3239 // This must be the only initializer 3240 if (i != 0 || NumMemInits > 1) { 3241 Diag(MemInits[0]->getSourceLocation(), 3242 diag::err_delegating_initializer_alone) 3243 << MemInits[0]->getSourceRange(); 3244 HadError = true; 3245 // We will treat this as being the only initializer. 3246 } 3247 SetDelegatingInitializer(Constructor, MemInits[i]); 3248 // Return immediately as the initializer is set. 3249 return; 3250 } 3251 } 3252 3253 if (HadError) 3254 return; 3255 3256 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3257 3258 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3259} 3260 3261void 3262Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3263 CXXRecordDecl *ClassDecl) { 3264 // Ignore dependent contexts. Also ignore unions, since their members never 3265 // have destructors implicitly called. 3266 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3267 return; 3268 3269 // FIXME: all the access-control diagnostics are positioned on the 3270 // field/base declaration. That's probably good; that said, the 3271 // user might reasonably want to know why the destructor is being 3272 // emitted, and we currently don't say. 3273 3274 // Non-static data members. 3275 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3276 E = ClassDecl->field_end(); I != E; ++I) { 3277 FieldDecl *Field = *I; 3278 if (Field->isInvalidDecl()) 3279 continue; 3280 3281 // Don't destroy incomplete or zero-length arrays. 3282 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3283 continue; 3284 3285 QualType FieldType = Context.getBaseElementType(Field->getType()); 3286 3287 const RecordType* RT = FieldType->getAs<RecordType>(); 3288 if (!RT) 3289 continue; 3290 3291 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3292 if (FieldClassDecl->isInvalidDecl()) 3293 continue; 3294 if (FieldClassDecl->hasIrrelevantDestructor()) 3295 continue; 3296 3297 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3298 assert(Dtor && "No dtor found for FieldClassDecl!"); 3299 CheckDestructorAccess(Field->getLocation(), Dtor, 3300 PDiag(diag::err_access_dtor_field) 3301 << Field->getDeclName() 3302 << FieldType); 3303 3304 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3305 DiagnoseUseOfDecl(Dtor, Location); 3306 } 3307 3308 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3309 3310 // Bases. 3311 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3312 E = ClassDecl->bases_end(); Base != E; ++Base) { 3313 // Bases are always records in a well-formed non-dependent class. 3314 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3315 3316 // Remember direct virtual bases. 3317 if (Base->isVirtual()) 3318 DirectVirtualBases.insert(RT); 3319 3320 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3321 // If our base class is invalid, we probably can't get its dtor anyway. 3322 if (BaseClassDecl->isInvalidDecl()) 3323 continue; 3324 if (BaseClassDecl->hasIrrelevantDestructor()) 3325 continue; 3326 3327 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3328 assert(Dtor && "No dtor found for BaseClassDecl!"); 3329 3330 // FIXME: caret should be on the start of the class name 3331 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3332 PDiag(diag::err_access_dtor_base) 3333 << Base->getType() 3334 << Base->getSourceRange()); 3335 3336 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3337 DiagnoseUseOfDecl(Dtor, Location); 3338 } 3339 3340 // Virtual bases. 3341 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3342 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3343 3344 // Bases are always records in a well-formed non-dependent class. 3345 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3346 3347 // Ignore direct virtual bases. 3348 if (DirectVirtualBases.count(RT)) 3349 continue; 3350 3351 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3352 // If our base class is invalid, we probably can't get its dtor anyway. 3353 if (BaseClassDecl->isInvalidDecl()) 3354 continue; 3355 if (BaseClassDecl->hasIrrelevantDestructor()) 3356 continue; 3357 3358 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3359 assert(Dtor && "No dtor found for BaseClassDecl!"); 3360 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3361 PDiag(diag::err_access_dtor_vbase) 3362 << VBase->getType()); 3363 3364 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3365 DiagnoseUseOfDecl(Dtor, Location); 3366 } 3367} 3368 3369void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3370 if (!CDtorDecl) 3371 return; 3372 3373 if (CXXConstructorDecl *Constructor 3374 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3375 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3376} 3377 3378bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3379 unsigned DiagID, AbstractDiagSelID SelID) { 3380 if (SelID == -1) 3381 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3382 else 3383 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3384} 3385 3386bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3387 const PartialDiagnostic &PD) { 3388 if (!getLangOptions().CPlusPlus) 3389 return false; 3390 3391 if (const ArrayType *AT = Context.getAsArrayType(T)) 3392 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3393 3394 if (const PointerType *PT = T->getAs<PointerType>()) { 3395 // Find the innermost pointer type. 3396 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3397 PT = T; 3398 3399 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3400 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3401 } 3402 3403 const RecordType *RT = T->getAs<RecordType>(); 3404 if (!RT) 3405 return false; 3406 3407 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3408 3409 // We can't answer whether something is abstract until it has a 3410 // definition. If it's currently being defined, we'll walk back 3411 // over all the declarations when we have a full definition. 3412 const CXXRecordDecl *Def = RD->getDefinition(); 3413 if (!Def || Def->isBeingDefined()) 3414 return false; 3415 3416 if (!RD->isAbstract()) 3417 return false; 3418 3419 Diag(Loc, PD) << RD->getDeclName(); 3420 DiagnoseAbstractType(RD); 3421 3422 return true; 3423} 3424 3425void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3426 // Check if we've already emitted the list of pure virtual functions 3427 // for this class. 3428 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3429 return; 3430 3431 CXXFinalOverriderMap FinalOverriders; 3432 RD->getFinalOverriders(FinalOverriders); 3433 3434 // Keep a set of seen pure methods so we won't diagnose the same method 3435 // more than once. 3436 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3437 3438 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3439 MEnd = FinalOverriders.end(); 3440 M != MEnd; 3441 ++M) { 3442 for (OverridingMethods::iterator SO = M->second.begin(), 3443 SOEnd = M->second.end(); 3444 SO != SOEnd; ++SO) { 3445 // C++ [class.abstract]p4: 3446 // A class is abstract if it contains or inherits at least one 3447 // pure virtual function for which the final overrider is pure 3448 // virtual. 3449 3450 // 3451 if (SO->second.size() != 1) 3452 continue; 3453 3454 if (!SO->second.front().Method->isPure()) 3455 continue; 3456 3457 if (!SeenPureMethods.insert(SO->second.front().Method)) 3458 continue; 3459 3460 Diag(SO->second.front().Method->getLocation(), 3461 diag::note_pure_virtual_function) 3462 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3463 } 3464 } 3465 3466 if (!PureVirtualClassDiagSet) 3467 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3468 PureVirtualClassDiagSet->insert(RD); 3469} 3470 3471namespace { 3472struct AbstractUsageInfo { 3473 Sema &S; 3474 CXXRecordDecl *Record; 3475 CanQualType AbstractType; 3476 bool Invalid; 3477 3478 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3479 : S(S), Record(Record), 3480 AbstractType(S.Context.getCanonicalType( 3481 S.Context.getTypeDeclType(Record))), 3482 Invalid(false) {} 3483 3484 void DiagnoseAbstractType() { 3485 if (Invalid) return; 3486 S.DiagnoseAbstractType(Record); 3487 Invalid = true; 3488 } 3489 3490 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3491}; 3492 3493struct CheckAbstractUsage { 3494 AbstractUsageInfo &Info; 3495 const NamedDecl *Ctx; 3496 3497 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3498 : Info(Info), Ctx(Ctx) {} 3499 3500 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3501 switch (TL.getTypeLocClass()) { 3502#define ABSTRACT_TYPELOC(CLASS, PARENT) 3503#define TYPELOC(CLASS, PARENT) \ 3504 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3505#include "clang/AST/TypeLocNodes.def" 3506 } 3507 } 3508 3509 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3510 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3511 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3512 if (!TL.getArg(I)) 3513 continue; 3514 3515 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3516 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3517 } 3518 } 3519 3520 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3521 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3522 } 3523 3524 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3525 // Visit the type parameters from a permissive context. 3526 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3527 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3528 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3529 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3530 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3531 // TODO: other template argument types? 3532 } 3533 } 3534 3535 // Visit pointee types from a permissive context. 3536#define CheckPolymorphic(Type) \ 3537 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3538 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3539 } 3540 CheckPolymorphic(PointerTypeLoc) 3541 CheckPolymorphic(ReferenceTypeLoc) 3542 CheckPolymorphic(MemberPointerTypeLoc) 3543 CheckPolymorphic(BlockPointerTypeLoc) 3544 CheckPolymorphic(AtomicTypeLoc) 3545 3546 /// Handle all the types we haven't given a more specific 3547 /// implementation for above. 3548 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3549 // Every other kind of type that we haven't called out already 3550 // that has an inner type is either (1) sugar or (2) contains that 3551 // inner type in some way as a subobject. 3552 if (TypeLoc Next = TL.getNextTypeLoc()) 3553 return Visit(Next, Sel); 3554 3555 // If there's no inner type and we're in a permissive context, 3556 // don't diagnose. 3557 if (Sel == Sema::AbstractNone) return; 3558 3559 // Check whether the type matches the abstract type. 3560 QualType T = TL.getType(); 3561 if (T->isArrayType()) { 3562 Sel = Sema::AbstractArrayType; 3563 T = Info.S.Context.getBaseElementType(T); 3564 } 3565 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3566 if (CT != Info.AbstractType) return; 3567 3568 // It matched; do some magic. 3569 if (Sel == Sema::AbstractArrayType) { 3570 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3571 << T << TL.getSourceRange(); 3572 } else { 3573 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3574 << Sel << T << TL.getSourceRange(); 3575 } 3576 Info.DiagnoseAbstractType(); 3577 } 3578}; 3579 3580void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3581 Sema::AbstractDiagSelID Sel) { 3582 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3583} 3584 3585} 3586 3587/// Check for invalid uses of an abstract type in a method declaration. 3588static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3589 CXXMethodDecl *MD) { 3590 // No need to do the check on definitions, which require that 3591 // the return/param types be complete. 3592 if (MD->doesThisDeclarationHaveABody()) 3593 return; 3594 3595 // For safety's sake, just ignore it if we don't have type source 3596 // information. This should never happen for non-implicit methods, 3597 // but... 3598 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3599 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3600} 3601 3602/// Check for invalid uses of an abstract type within a class definition. 3603static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3604 CXXRecordDecl *RD) { 3605 for (CXXRecordDecl::decl_iterator 3606 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3607 Decl *D = *I; 3608 if (D->isImplicit()) continue; 3609 3610 // Methods and method templates. 3611 if (isa<CXXMethodDecl>(D)) { 3612 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3613 } else if (isa<FunctionTemplateDecl>(D)) { 3614 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3615 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3616 3617 // Fields and static variables. 3618 } else if (isa<FieldDecl>(D)) { 3619 FieldDecl *FD = cast<FieldDecl>(D); 3620 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3621 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3622 } else if (isa<VarDecl>(D)) { 3623 VarDecl *VD = cast<VarDecl>(D); 3624 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3625 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3626 3627 // Nested classes and class templates. 3628 } else if (isa<CXXRecordDecl>(D)) { 3629 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3630 } else if (isa<ClassTemplateDecl>(D)) { 3631 CheckAbstractClassUsage(Info, 3632 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3633 } 3634 } 3635} 3636 3637/// \brief Perform semantic checks on a class definition that has been 3638/// completing, introducing implicitly-declared members, checking for 3639/// abstract types, etc. 3640void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3641 if (!Record) 3642 return; 3643 3644 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3645 AbstractUsageInfo Info(*this, Record); 3646 CheckAbstractClassUsage(Info, Record); 3647 } 3648 3649 // If this is not an aggregate type and has no user-declared constructor, 3650 // complain about any non-static data members of reference or const scalar 3651 // type, since they will never get initializers. 3652 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3653 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3654 !Record->isLambda()) { 3655 bool Complained = false; 3656 for (RecordDecl::field_iterator F = Record->field_begin(), 3657 FEnd = Record->field_end(); 3658 F != FEnd; ++F) { 3659 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3660 continue; 3661 3662 if (F->getType()->isReferenceType() || 3663 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3664 if (!Complained) { 3665 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3666 << Record->getTagKind() << Record; 3667 Complained = true; 3668 } 3669 3670 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3671 << F->getType()->isReferenceType() 3672 << F->getDeclName(); 3673 } 3674 } 3675 } 3676 3677 if (Record->isDynamicClass() && !Record->isDependentType()) 3678 DynamicClasses.push_back(Record); 3679 3680 if (Record->getIdentifier()) { 3681 // C++ [class.mem]p13: 3682 // If T is the name of a class, then each of the following shall have a 3683 // name different from T: 3684 // - every member of every anonymous union that is a member of class T. 3685 // 3686 // C++ [class.mem]p14: 3687 // In addition, if class T has a user-declared constructor (12.1), every 3688 // non-static data member of class T shall have a name different from T. 3689 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3690 R.first != R.second; ++R.first) { 3691 NamedDecl *D = *R.first; 3692 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3693 isa<IndirectFieldDecl>(D)) { 3694 Diag(D->getLocation(), diag::err_member_name_of_class) 3695 << D->getDeclName(); 3696 break; 3697 } 3698 } 3699 } 3700 3701 // Warn if the class has virtual methods but non-virtual public destructor. 3702 if (Record->isPolymorphic() && !Record->isDependentType()) { 3703 CXXDestructorDecl *dtor = Record->getDestructor(); 3704 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3705 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3706 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3707 } 3708 3709 // See if a method overloads virtual methods in a base 3710 /// class without overriding any. 3711 if (!Record->isDependentType()) { 3712 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3713 MEnd = Record->method_end(); 3714 M != MEnd; ++M) { 3715 if (!(*M)->isStatic()) 3716 DiagnoseHiddenVirtualMethods(Record, *M); 3717 } 3718 } 3719 3720 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3721 // function that is not a constructor declares that member function to be 3722 // const. [...] The class of which that function is a member shall be 3723 // a literal type. 3724 // 3725 // If the class has virtual bases, any constexpr members will already have 3726 // been diagnosed by the checks performed on the member declaration, so 3727 // suppress this (less useful) diagnostic. 3728 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3729 !Record->isLiteral() && !Record->getNumVBases()) { 3730 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3731 MEnd = Record->method_end(); 3732 M != MEnd; ++M) { 3733 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3734 switch (Record->getTemplateSpecializationKind()) { 3735 case TSK_ImplicitInstantiation: 3736 case TSK_ExplicitInstantiationDeclaration: 3737 case TSK_ExplicitInstantiationDefinition: 3738 // If a template instantiates to a non-literal type, but its members 3739 // instantiate to constexpr functions, the template is technically 3740 // ill-formed, but we allow it for sanity. 3741 continue; 3742 3743 case TSK_Undeclared: 3744 case TSK_ExplicitSpecialization: 3745 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3746 PDiag(diag::err_constexpr_method_non_literal)); 3747 break; 3748 } 3749 3750 // Only produce one error per class. 3751 break; 3752 } 3753 } 3754 } 3755 3756 // Declare inherited constructors. We do this eagerly here because: 3757 // - The standard requires an eager diagnostic for conflicting inherited 3758 // constructors from different classes. 3759 // - The lazy declaration of the other implicit constructors is so as to not 3760 // waste space and performance on classes that are not meant to be 3761 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3762 // have inherited constructors. 3763 DeclareInheritedConstructors(Record); 3764 3765 if (!Record->isDependentType()) 3766 CheckExplicitlyDefaultedMethods(Record); 3767} 3768 3769void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3770 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3771 ME = Record->method_end(); 3772 MI != ME; ++MI) { 3773 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3774 switch (getSpecialMember(*MI)) { 3775 case CXXDefaultConstructor: 3776 CheckExplicitlyDefaultedDefaultConstructor( 3777 cast<CXXConstructorDecl>(*MI)); 3778 break; 3779 3780 case CXXDestructor: 3781 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3782 break; 3783 3784 case CXXCopyConstructor: 3785 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3786 break; 3787 3788 case CXXCopyAssignment: 3789 CheckExplicitlyDefaultedCopyAssignment(*MI); 3790 break; 3791 3792 case CXXMoveConstructor: 3793 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3794 break; 3795 3796 case CXXMoveAssignment: 3797 CheckExplicitlyDefaultedMoveAssignment(*MI); 3798 break; 3799 3800 case CXXInvalid: 3801 llvm_unreachable("non-special member explicitly defaulted!"); 3802 } 3803 } 3804 } 3805 3806} 3807 3808void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3809 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3810 3811 // Whether this was the first-declared instance of the constructor. 3812 // This affects whether we implicitly add an exception spec (and, eventually, 3813 // constexpr). It is also ill-formed to explicitly default a constructor such 3814 // that it would be deleted. (C++0x [decl.fct.def.default]) 3815 bool First = CD == CD->getCanonicalDecl(); 3816 3817 bool HadError = false; 3818 if (CD->getNumParams() != 0) { 3819 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3820 << CD->getSourceRange(); 3821 HadError = true; 3822 } 3823 3824 ImplicitExceptionSpecification Spec 3825 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3826 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3827 if (EPI.ExceptionSpecType == EST_Delayed) { 3828 // Exception specification depends on some deferred part of the class. We'll 3829 // try again when the class's definition has been fully processed. 3830 return; 3831 } 3832 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3833 *ExceptionType = Context.getFunctionType( 3834 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3835 3836 // C++11 [dcl.fct.def.default]p2: 3837 // An explicitly-defaulted function may be declared constexpr only if it 3838 // would have been implicitly declared as constexpr, 3839 // Do not apply this rule to templates, since core issue 1358 makes such 3840 // functions always instantiate to constexpr functions. 3841 if (CD->isConstexpr() && 3842 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3843 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3844 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3845 << CXXDefaultConstructor; 3846 HadError = true; 3847 } 3848 } 3849 // and may have an explicit exception-specification only if it is compatible 3850 // with the exception-specification on the implicit declaration. 3851 if (CtorType->hasExceptionSpec()) { 3852 if (CheckEquivalentExceptionSpec( 3853 PDiag(diag::err_incorrect_defaulted_exception_spec) 3854 << CXXDefaultConstructor, 3855 PDiag(), 3856 ExceptionType, SourceLocation(), 3857 CtorType, CD->getLocation())) { 3858 HadError = true; 3859 } 3860 } 3861 3862 // If a function is explicitly defaulted on its first declaration, 3863 if (First) { 3864 // -- it is implicitly considered to be constexpr if the implicit 3865 // definition would be, 3866 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3867 3868 // -- it is implicitly considered to have the same 3869 // exception-specification as if it had been implicitly declared 3870 // 3871 // FIXME: a compatible, but different, explicit exception specification 3872 // will be silently overridden. We should issue a warning if this happens. 3873 EPI.ExtInfo = CtorType->getExtInfo(); 3874 } 3875 3876 if (HadError) { 3877 CD->setInvalidDecl(); 3878 return; 3879 } 3880 3881 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3882 if (First) { 3883 CD->setDeletedAsWritten(); 3884 } else { 3885 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3886 << CXXDefaultConstructor; 3887 CD->setInvalidDecl(); 3888 } 3889 } 3890} 3891 3892void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3893 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3894 3895 // Whether this was the first-declared instance of the constructor. 3896 bool First = CD == CD->getCanonicalDecl(); 3897 3898 bool HadError = false; 3899 if (CD->getNumParams() != 1) { 3900 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3901 << CD->getSourceRange(); 3902 HadError = true; 3903 } 3904 3905 ImplicitExceptionSpecification Spec(Context); 3906 bool Const; 3907 llvm::tie(Spec, Const) = 3908 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3909 3910 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3911 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3912 *ExceptionType = Context.getFunctionType( 3913 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3914 3915 // Check for parameter type matching. 3916 // This is a copy ctor so we know it's a cv-qualified reference to T. 3917 QualType ArgType = CtorType->getArgType(0); 3918 if (ArgType->getPointeeType().isVolatileQualified()) { 3919 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3920 HadError = true; 3921 } 3922 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3923 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3924 HadError = true; 3925 } 3926 3927 // C++11 [dcl.fct.def.default]p2: 3928 // An explicitly-defaulted function may be declared constexpr only if it 3929 // would have been implicitly declared as constexpr, 3930 // Do not apply this rule to templates, since core issue 1358 makes such 3931 // functions always instantiate to constexpr functions. 3932 if (CD->isConstexpr() && 3933 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3934 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3935 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3936 << CXXCopyConstructor; 3937 HadError = true; 3938 } 3939 } 3940 // and may have an explicit exception-specification only if it is compatible 3941 // with the exception-specification on the implicit declaration. 3942 if (CtorType->hasExceptionSpec()) { 3943 if (CheckEquivalentExceptionSpec( 3944 PDiag(diag::err_incorrect_defaulted_exception_spec) 3945 << CXXCopyConstructor, 3946 PDiag(), 3947 ExceptionType, SourceLocation(), 3948 CtorType, CD->getLocation())) { 3949 HadError = true; 3950 } 3951 } 3952 3953 // If a function is explicitly defaulted on its first declaration, 3954 if (First) { 3955 // -- it is implicitly considered to be constexpr if the implicit 3956 // definition would be, 3957 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3958 3959 // -- it is implicitly considered to have the same 3960 // exception-specification as if it had been implicitly declared, and 3961 // 3962 // FIXME: a compatible, but different, explicit exception specification 3963 // will be silently overridden. We should issue a warning if this happens. 3964 EPI.ExtInfo = CtorType->getExtInfo(); 3965 3966 // -- [...] it shall have the same parameter type as if it had been 3967 // implicitly declared. 3968 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3969 } 3970 3971 if (HadError) { 3972 CD->setInvalidDecl(); 3973 return; 3974 } 3975 3976 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3977 if (First) { 3978 CD->setDeletedAsWritten(); 3979 } else { 3980 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3981 << CXXCopyConstructor; 3982 CD->setInvalidDecl(); 3983 } 3984 } 3985} 3986 3987void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3988 assert(MD->isExplicitlyDefaulted()); 3989 3990 // Whether this was the first-declared instance of the operator 3991 bool First = MD == MD->getCanonicalDecl(); 3992 3993 bool HadError = false; 3994 if (MD->getNumParams() != 1) { 3995 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3996 << MD->getSourceRange(); 3997 HadError = true; 3998 } 3999 4000 QualType ReturnType = 4001 MD->getType()->getAs<FunctionType>()->getResultType(); 4002 if (!ReturnType->isLValueReferenceType() || 4003 !Context.hasSameType( 4004 Context.getCanonicalType(ReturnType->getPointeeType()), 4005 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4006 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 4007 HadError = true; 4008 } 4009 4010 ImplicitExceptionSpecification Spec(Context); 4011 bool Const; 4012 llvm::tie(Spec, Const) = 4013 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 4014 4015 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4016 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4017 *ExceptionType = Context.getFunctionType( 4018 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4019 4020 QualType ArgType = OperType->getArgType(0); 4021 if (!ArgType->isLValueReferenceType()) { 4022 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4023 HadError = true; 4024 } else { 4025 if (ArgType->getPointeeType().isVolatileQualified()) { 4026 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 4027 HadError = true; 4028 } 4029 if (ArgType->getPointeeType().isConstQualified() && !Const) { 4030 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 4031 HadError = true; 4032 } 4033 } 4034 4035 if (OperType->getTypeQuals()) { 4036 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 4037 HadError = true; 4038 } 4039 4040 if (OperType->hasExceptionSpec()) { 4041 if (CheckEquivalentExceptionSpec( 4042 PDiag(diag::err_incorrect_defaulted_exception_spec) 4043 << CXXCopyAssignment, 4044 PDiag(), 4045 ExceptionType, SourceLocation(), 4046 OperType, MD->getLocation())) { 4047 HadError = true; 4048 } 4049 } 4050 if (First) { 4051 // We set the declaration to have the computed exception spec here. 4052 // We duplicate the one parameter type. 4053 EPI.RefQualifier = OperType->getRefQualifier(); 4054 EPI.ExtInfo = OperType->getExtInfo(); 4055 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4056 } 4057 4058 if (HadError) { 4059 MD->setInvalidDecl(); 4060 return; 4061 } 4062 4063 if (ShouldDeleteSpecialMember(MD, CXXCopyAssignment)) { 4064 if (First) { 4065 MD->setDeletedAsWritten(); 4066 } else { 4067 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4068 << CXXCopyAssignment; 4069 MD->setInvalidDecl(); 4070 } 4071 } 4072} 4073 4074void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 4075 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 4076 4077 // Whether this was the first-declared instance of the constructor. 4078 bool First = CD == CD->getCanonicalDecl(); 4079 4080 bool HadError = false; 4081 if (CD->getNumParams() != 1) { 4082 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4083 << CD->getSourceRange(); 4084 HadError = true; 4085 } 4086 4087 ImplicitExceptionSpecification Spec( 4088 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4089 4090 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4091 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4092 *ExceptionType = Context.getFunctionType( 4093 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4094 4095 // Check for parameter type matching. 4096 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4097 QualType ArgType = CtorType->getArgType(0); 4098 if (ArgType->getPointeeType().isVolatileQualified()) { 4099 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4100 HadError = true; 4101 } 4102 if (ArgType->getPointeeType().isConstQualified()) { 4103 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4104 HadError = true; 4105 } 4106 4107 // C++11 [dcl.fct.def.default]p2: 4108 // An explicitly-defaulted function may be declared constexpr only if it 4109 // would have been implicitly declared as constexpr, 4110 // Do not apply this rule to templates, since core issue 1358 makes such 4111 // functions always instantiate to constexpr functions. 4112 if (CD->isConstexpr() && 4113 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4114 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4115 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4116 << CXXMoveConstructor; 4117 HadError = true; 4118 } 4119 } 4120 // and may have an explicit exception-specification only if it is compatible 4121 // with the exception-specification on the implicit declaration. 4122 if (CtorType->hasExceptionSpec()) { 4123 if (CheckEquivalentExceptionSpec( 4124 PDiag(diag::err_incorrect_defaulted_exception_spec) 4125 << CXXMoveConstructor, 4126 PDiag(), 4127 ExceptionType, SourceLocation(), 4128 CtorType, CD->getLocation())) { 4129 HadError = true; 4130 } 4131 } 4132 4133 // If a function is explicitly defaulted on its first declaration, 4134 if (First) { 4135 // -- it is implicitly considered to be constexpr if the implicit 4136 // definition would be, 4137 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4138 4139 // -- it is implicitly considered to have the same 4140 // exception-specification as if it had been implicitly declared, and 4141 // 4142 // FIXME: a compatible, but different, explicit exception specification 4143 // will be silently overridden. We should issue a warning if this happens. 4144 EPI.ExtInfo = CtorType->getExtInfo(); 4145 4146 // -- [...] it shall have the same parameter type as if it had been 4147 // implicitly declared. 4148 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4149 } 4150 4151 if (HadError) { 4152 CD->setInvalidDecl(); 4153 return; 4154 } 4155 4156 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4157 if (First) { 4158 CD->setDeletedAsWritten(); 4159 } else { 4160 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4161 << CXXMoveConstructor; 4162 CD->setInvalidDecl(); 4163 } 4164 } 4165} 4166 4167void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4168 assert(MD->isExplicitlyDefaulted()); 4169 4170 // Whether this was the first-declared instance of the operator 4171 bool First = MD == MD->getCanonicalDecl(); 4172 4173 bool HadError = false; 4174 if (MD->getNumParams() != 1) { 4175 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4176 << MD->getSourceRange(); 4177 HadError = true; 4178 } 4179 4180 QualType ReturnType = 4181 MD->getType()->getAs<FunctionType>()->getResultType(); 4182 if (!ReturnType->isLValueReferenceType() || 4183 !Context.hasSameType( 4184 Context.getCanonicalType(ReturnType->getPointeeType()), 4185 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4186 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4187 HadError = true; 4188 } 4189 4190 ImplicitExceptionSpecification Spec( 4191 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4192 4193 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4194 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4195 *ExceptionType = Context.getFunctionType( 4196 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4197 4198 QualType ArgType = OperType->getArgType(0); 4199 if (!ArgType->isRValueReferenceType()) { 4200 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4201 HadError = true; 4202 } else { 4203 if (ArgType->getPointeeType().isVolatileQualified()) { 4204 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4205 HadError = true; 4206 } 4207 if (ArgType->getPointeeType().isConstQualified()) { 4208 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4209 HadError = true; 4210 } 4211 } 4212 4213 if (OperType->getTypeQuals()) { 4214 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4215 HadError = true; 4216 } 4217 4218 if (OperType->hasExceptionSpec()) { 4219 if (CheckEquivalentExceptionSpec( 4220 PDiag(diag::err_incorrect_defaulted_exception_spec) 4221 << CXXMoveAssignment, 4222 PDiag(), 4223 ExceptionType, SourceLocation(), 4224 OperType, MD->getLocation())) { 4225 HadError = true; 4226 } 4227 } 4228 if (First) { 4229 // We set the declaration to have the computed exception spec here. 4230 // We duplicate the one parameter type. 4231 EPI.RefQualifier = OperType->getRefQualifier(); 4232 EPI.ExtInfo = OperType->getExtInfo(); 4233 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4234 } 4235 4236 if (HadError) { 4237 MD->setInvalidDecl(); 4238 return; 4239 } 4240 4241 if (ShouldDeleteSpecialMember(MD, CXXMoveAssignment)) { 4242 if (First) { 4243 MD->setDeletedAsWritten(); 4244 } else { 4245 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4246 << CXXMoveAssignment; 4247 MD->setInvalidDecl(); 4248 } 4249 } 4250} 4251 4252void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4253 assert(DD->isExplicitlyDefaulted()); 4254 4255 // Whether this was the first-declared instance of the destructor. 4256 bool First = DD == DD->getCanonicalDecl(); 4257 4258 ImplicitExceptionSpecification Spec 4259 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4260 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4261 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4262 *ExceptionType = Context.getFunctionType( 4263 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4264 4265 if (DtorType->hasExceptionSpec()) { 4266 if (CheckEquivalentExceptionSpec( 4267 PDiag(diag::err_incorrect_defaulted_exception_spec) 4268 << CXXDestructor, 4269 PDiag(), 4270 ExceptionType, SourceLocation(), 4271 DtorType, DD->getLocation())) { 4272 DD->setInvalidDecl(); 4273 return; 4274 } 4275 } 4276 if (First) { 4277 // We set the declaration to have the computed exception spec here. 4278 // There are no parameters. 4279 EPI.ExtInfo = DtorType->getExtInfo(); 4280 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4281 } 4282 4283 if (ShouldDeleteSpecialMember(DD, CXXDestructor)) { 4284 if (First) { 4285 DD->setDeletedAsWritten(); 4286 } else { 4287 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4288 << CXXDestructor; 4289 DD->setInvalidDecl(); 4290 } 4291 } 4292} 4293 4294namespace { 4295struct SpecialMemberDeletionInfo { 4296 Sema &S; 4297 CXXMethodDecl *MD; 4298 Sema::CXXSpecialMember CSM; 4299 4300 // Properties of the special member, computed for convenience. 4301 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4302 SourceLocation Loc; 4303 4304 bool AllFieldsAreConst; 4305 4306 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4307 Sema::CXXSpecialMember CSM) 4308 : S(S), MD(MD), CSM(CSM), 4309 IsConstructor(false), IsAssignment(false), IsMove(false), 4310 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4311 AllFieldsAreConst(true) { 4312 switch (CSM) { 4313 case Sema::CXXDefaultConstructor: 4314 case Sema::CXXCopyConstructor: 4315 IsConstructor = true; 4316 break; 4317 case Sema::CXXMoveConstructor: 4318 IsConstructor = true; 4319 IsMove = true; 4320 break; 4321 case Sema::CXXCopyAssignment: 4322 IsAssignment = true; 4323 break; 4324 case Sema::CXXMoveAssignment: 4325 IsAssignment = true; 4326 IsMove = true; 4327 break; 4328 case Sema::CXXDestructor: 4329 break; 4330 case Sema::CXXInvalid: 4331 llvm_unreachable("invalid special member kind"); 4332 } 4333 4334 if (MD->getNumParams()) { 4335 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4336 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4337 } 4338 } 4339 4340 bool inUnion() const { return MD->getParent()->isUnion(); } 4341 4342 /// Look up the corresponding special member in the given class. 4343 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class) { 4344 unsigned TQ = MD->getTypeQualifiers(); 4345 return S.LookupSpecialMember(Class, CSM, ConstArg, VolatileArg, 4346 MD->getRefQualifier() == RQ_RValue, 4347 TQ & Qualifiers::Const, 4348 TQ & Qualifiers::Volatile); 4349 } 4350 4351 bool shouldDeleteForBase(CXXRecordDecl *BaseDecl, bool IsVirtualBase); 4352 bool shouldDeleteForField(FieldDecl *FD); 4353 bool shouldDeleteForAllConstMembers(); 4354}; 4355} 4356 4357/// Check whether we should delete a special member function due to the class 4358/// having a particular direct or virtual base class. 4359bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXRecordDecl *BaseDecl, 4360 bool IsVirtualBase) { 4361 // C++11 [class.copy]p23: 4362 // -- for the move assignment operator, any direct or indirect virtual 4363 // base class. 4364 if (CSM == Sema::CXXMoveAssignment && IsVirtualBase) 4365 return true; 4366 4367 // C++11 [class.ctor]p5, C++11 [class.copy]p11, C++11 [class.dtor]p5: 4368 // -- any direct or virtual base class [...] has a type with a destructor 4369 // that is deleted or inaccessible 4370 if (!IsAssignment) { 4371 CXXDestructorDecl *BaseDtor = S.LookupDestructor(BaseDecl); 4372 if (BaseDtor->isDeleted()) 4373 return true; 4374 if (S.CheckDestructorAccess(Loc, BaseDtor, S.PDiag()) 4375 != Sema::AR_accessible) 4376 return true; 4377 } 4378 4379 // C++11 [class.ctor]p5: 4380 // -- any direct or virtual base class [...] has class type M [...] and 4381 // either M has no default constructor or overload resolution as applied 4382 // to M's default constructor results in an ambiguity or in a function 4383 // that is deleted or inaccessible 4384 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4385 // -- a direct or virtual base class B that cannot be copied/moved because 4386 // overload resolution, as applied to B's corresponding special member, 4387 // results in an ambiguity or a function that is deleted or inaccessible 4388 // from the defaulted special member 4389 if (CSM != Sema::CXXDestructor) { 4390 Sema::SpecialMemberOverloadResult *SMOR = lookupIn(BaseDecl); 4391 if (!SMOR->hasSuccess()) 4392 return true; 4393 4394 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4395 if (IsConstructor) { 4396 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4397 if (S.CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4398 S.PDiag()) != Sema::AR_accessible) 4399 return true; 4400 4401 // -- for the move constructor, a [...] direct or virtual base class with 4402 // a type that does not have a move constructor and is not trivially 4403 // copyable. 4404 if (IsMove && !BaseCtor->isMoveConstructor() && 4405 !BaseDecl->isTriviallyCopyable()) 4406 return true; 4407 } else { 4408 assert(IsAssignment && "unexpected kind of special member"); 4409 if (S.CheckDirectMemberAccess(Loc, BaseMember, S.PDiag()) 4410 != Sema::AR_accessible) 4411 return true; 4412 4413 // -- for the move assignment operator, a direct base class with a type 4414 // that does not have a move assignment operator and is not trivially 4415 // copyable. 4416 if (IsMove && !BaseMember->isMoveAssignmentOperator() && 4417 !BaseDecl->isTriviallyCopyable()) 4418 return true; 4419 } 4420 } 4421 4422 // C++11 [class.dtor]p5: 4423 // -- for a virtual destructor, lookup of the non-array deallocation function 4424 // results in an ambiguity or in a function that is deleted or inaccessible 4425 if (CSM == Sema::CXXDestructor && MD->isVirtual()) { 4426 FunctionDecl *OperatorDelete = 0; 4427 DeclarationName Name = 4428 S.Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4429 if (S.FindDeallocationFunction(Loc, MD->getParent(), Name, 4430 OperatorDelete, false)) 4431 return true; 4432 } 4433 4434 return false; 4435} 4436 4437/// Check whether we should delete a special member function due to the class 4438/// having a particular non-static data member. 4439bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4440 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4441 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4442 4443 if (CSM == Sema::CXXDefaultConstructor) { 4444 // For a default constructor, all references must be initialized in-class 4445 // and, if a union, it must have a non-const member. 4446 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) 4447 return true; 4448 4449 if (inUnion() && !FieldType.isConstQualified()) 4450 AllFieldsAreConst = false; 4451 } else if (CSM == Sema::CXXCopyConstructor) { 4452 // For a copy constructor, data members must not be of rvalue reference 4453 // type. 4454 if (FieldType->isRValueReferenceType()) 4455 return true; 4456 } else if (IsAssignment) { 4457 // For an assignment operator, data members must not be of reference type. 4458 if (FieldType->isReferenceType()) 4459 return true; 4460 } 4461 4462 if (FieldRecord) { 4463 // For a default constructor, a const member must have a user-provided 4464 // default constructor or else be explicitly initialized. 4465 if (CSM == Sema::CXXDefaultConstructor && FieldType.isConstQualified() && 4466 !FD->hasInClassInitializer() && 4467 !FieldRecord->hasUserProvidedDefaultConstructor()) 4468 return true; 4469 4470 // Some additional restrictions exist on the variant members. 4471 if (!inUnion() && FieldRecord->isUnion() && 4472 FieldRecord->isAnonymousStructOrUnion()) { 4473 bool AllVariantFieldsAreConst = true; 4474 4475 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4476 UE = FieldRecord->field_end(); 4477 UI != UE; ++UI) { 4478 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4479 CXXRecordDecl *UnionFieldRecord = 4480 UnionFieldType->getAsCXXRecordDecl(); 4481 4482 if (!UnionFieldType.isConstQualified()) 4483 AllVariantFieldsAreConst = false; 4484 4485 if (UnionFieldRecord) { 4486 // FIXME: Checking for accessibility and validity of this 4487 // destructor is technically going beyond the 4488 // standard, but this is believed to be a defect. 4489 if (!IsAssignment) { 4490 CXXDestructorDecl *FieldDtor = S.LookupDestructor(UnionFieldRecord); 4491 if (FieldDtor->isDeleted()) 4492 return true; 4493 if (S.CheckDestructorAccess(Loc, FieldDtor, S.PDiag()) != 4494 Sema::AR_accessible) 4495 return true; 4496 if (!FieldDtor->isTrivial()) 4497 return true; 4498 } 4499 4500 // FIXME: in-class initializers should be handled here 4501 if (CSM != Sema::CXXDestructor) { 4502 Sema::SpecialMemberOverloadResult *SMOR = 4503 lookupIn(UnionFieldRecord); 4504 // FIXME: Checking for accessibility and validity of this 4505 // corresponding member is technically going beyond the 4506 // standard, but this is believed to be a defect. 4507 if (!SMOR->hasSuccess()) 4508 return true; 4509 4510 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4511 // A member of a union must have a trivial corresponding 4512 // special member. 4513 if (!FieldMember->isTrivial()) 4514 return true; 4515 4516 if (IsConstructor) { 4517 CXXConstructorDecl *FieldCtor = 4518 cast<CXXConstructorDecl>(FieldMember); 4519 if (S.CheckConstructorAccess(Loc, FieldCtor, 4520 FieldCtor->getAccess(), 4521 S.PDiag()) != Sema::AR_accessible) 4522 return true; 4523 } else { 4524 assert(IsAssignment && "unexpected kind of special member"); 4525 if (S.CheckDirectMemberAccess(Loc, FieldMember, S.PDiag()) 4526 != Sema::AR_accessible) 4527 return true; 4528 } 4529 } 4530 } 4531 } 4532 4533 // At least one member in each anonymous union must be non-const 4534 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4535 FieldRecord->field_begin() != FieldRecord->field_end()) 4536 return true; 4537 4538 // Don't try to initialize the anonymous union 4539 // This is technically non-conformant, but sanity demands it. 4540 return false; 4541 } 4542 4543 // Unless we're doing assignment, the field's destructor must be 4544 // accessible and not deleted. 4545 if (!IsAssignment) { 4546 CXXDestructorDecl *FieldDtor = S.LookupDestructor(FieldRecord); 4547 if (FieldDtor->isDeleted()) 4548 return true; 4549 if (S.CheckDestructorAccess(Loc, FieldDtor, S.PDiag()) != 4550 Sema::AR_accessible) 4551 return true; 4552 } 4553 4554 // Check that the corresponding member of the field is accessible, 4555 // unique, and non-deleted. We don't do this if it has an explicit 4556 // initialization when default-constructing. 4557 if (CSM != Sema::CXXDestructor && 4558 !(CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer())) { 4559 Sema::SpecialMemberOverloadResult *SMOR = lookupIn(FieldRecord); 4560 if (!SMOR->hasSuccess()) 4561 return true; 4562 4563 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4564 if (IsConstructor) { 4565 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4566 if (S.CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4567 S.PDiag()) != Sema::AR_accessible) 4568 return true; 4569 4570 // For a move operation, the corresponding operation must actually 4571 // be a move operation (and not a copy selected by overload 4572 // resolution) unless we are working on a trivially copyable class. 4573 if (IsMove && !FieldCtor->isMoveConstructor() && 4574 !FieldRecord->isTriviallyCopyable()) 4575 return true; 4576 } else { 4577 assert(IsAssignment && "unexpected kind of special member"); 4578 if (S.CheckDirectMemberAccess(Loc, FieldMember, S.PDiag()) 4579 != Sema::AR_accessible) 4580 return true; 4581 4582 // -- for the move assignment operator, a non-static data member with a 4583 // type that does not have a move assignment operator and is not 4584 // trivially copyable. 4585 if (IsMove && !FieldMember->isMoveAssignmentOperator() && 4586 !FieldRecord->isTriviallyCopyable()) 4587 return true; 4588 } 4589 4590 // We need the corresponding member of a union to be trivial so that 4591 // we can safely copy them all simultaneously. 4592 // FIXME: Note that performing the check here (where we rely on the lack 4593 // of an in-class initializer) is technically ill-formed. However, this 4594 // seems most obviously to be a bug in the standard. 4595 if (inUnion() && !FieldMember->isTrivial()) 4596 return true; 4597 } 4598 } else if (CSM == Sema::CXXDefaultConstructor && !inUnion() && 4599 FieldType.isConstQualified() && !FD->hasInClassInitializer()) { 4600 // We can't initialize a const member of non-class type to any value. 4601 return true; 4602 } else if (IsAssignment && FieldType.isConstQualified()) { 4603 // C++11 [class.copy]p23: 4604 // -- a non-static data member of const non-class type (or array thereof) 4605 return true; 4606 } 4607 4608 return false; 4609} 4610 4611/// C++11 [class.ctor] p5: 4612/// A defaulted default constructor for a class X is defined as deleted if 4613/// X is a union and all of its variant members are of const-qualified type. 4614bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4615 // This is a silly definition, because it gives an empty union a deleted 4616 // default constructor. Don't do that. 4617 return CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4618 (MD->getParent()->field_begin() != MD->getParent()->field_end()); 4619} 4620 4621/// Determine whether a defaulted special member function should be defined as 4622/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4623/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4624bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4625 assert(!MD->isInvalidDecl()); 4626 CXXRecordDecl *RD = MD->getParent(); 4627 assert(!RD->isDependentType() && "do deletion after instantiation"); 4628 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4629 return false; 4630 4631 // C++11 [expr.lambda.prim]p19: 4632 // The closure type associated with a lambda-expression has a 4633 // deleted (8.4.3) default constructor and a deleted copy 4634 // assignment operator. 4635 if (RD->isLambda() && 4636 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) 4637 return true; 4638 4639 // For an anonymous struct or union, the copy and assignment special members 4640 // will never be used, so skip the check. For an anonymous union declared at 4641 // namespace scope, the constructor and destructor are used. 4642 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4643 RD->isAnonymousStructOrUnion()) 4644 return false; 4645 4646 // Do access control from the special member function 4647 ContextRAII MethodContext(*this, MD); 4648 4649 SpecialMemberDeletionInfo SMI(*this, MD, CSM); 4650 4651 // FIXME: We should put some diagnostic logic right into this function. 4652 4653 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4654 BE = RD->bases_end(); BI != BE; ++BI) 4655 if (!BI->isVirtual() && 4656 SMI.shouldDeleteForBase(BI->getType()->getAsCXXRecordDecl(), false)) 4657 return true; 4658 4659 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4660 BE = RD->vbases_end(); BI != BE; ++BI) 4661 if (SMI.shouldDeleteForBase(BI->getType()->getAsCXXRecordDecl(), true)) 4662 return true; 4663 4664 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4665 FE = RD->field_end(); FI != FE; ++FI) 4666 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4667 SMI.shouldDeleteForField(*FI)) 4668 return true; 4669 4670 if (SMI.shouldDeleteForAllConstMembers()) 4671 return true; 4672 4673 return false; 4674} 4675 4676/// \brief Data used with FindHiddenVirtualMethod 4677namespace { 4678 struct FindHiddenVirtualMethodData { 4679 Sema *S; 4680 CXXMethodDecl *Method; 4681 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4682 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4683 }; 4684} 4685 4686/// \brief Member lookup function that determines whether a given C++ 4687/// method overloads virtual methods in a base class without overriding any, 4688/// to be used with CXXRecordDecl::lookupInBases(). 4689static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4690 CXXBasePath &Path, 4691 void *UserData) { 4692 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4693 4694 FindHiddenVirtualMethodData &Data 4695 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4696 4697 DeclarationName Name = Data.Method->getDeclName(); 4698 assert(Name.getNameKind() == DeclarationName::Identifier); 4699 4700 bool foundSameNameMethod = false; 4701 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4702 for (Path.Decls = BaseRecord->lookup(Name); 4703 Path.Decls.first != Path.Decls.second; 4704 ++Path.Decls.first) { 4705 NamedDecl *D = *Path.Decls.first; 4706 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4707 MD = MD->getCanonicalDecl(); 4708 foundSameNameMethod = true; 4709 // Interested only in hidden virtual methods. 4710 if (!MD->isVirtual()) 4711 continue; 4712 // If the method we are checking overrides a method from its base 4713 // don't warn about the other overloaded methods. 4714 if (!Data.S->IsOverload(Data.Method, MD, false)) 4715 return true; 4716 // Collect the overload only if its hidden. 4717 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4718 overloadedMethods.push_back(MD); 4719 } 4720 } 4721 4722 if (foundSameNameMethod) 4723 Data.OverloadedMethods.append(overloadedMethods.begin(), 4724 overloadedMethods.end()); 4725 return foundSameNameMethod; 4726} 4727 4728/// \brief See if a method overloads virtual methods in a base class without 4729/// overriding any. 4730void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4731 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4732 MD->getLocation()) == DiagnosticsEngine::Ignored) 4733 return; 4734 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4735 return; 4736 4737 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4738 /*bool RecordPaths=*/false, 4739 /*bool DetectVirtual=*/false); 4740 FindHiddenVirtualMethodData Data; 4741 Data.Method = MD; 4742 Data.S = this; 4743 4744 // Keep the base methods that were overriden or introduced in the subclass 4745 // by 'using' in a set. A base method not in this set is hidden. 4746 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4747 res.first != res.second; ++res.first) { 4748 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4749 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4750 E = MD->end_overridden_methods(); 4751 I != E; ++I) 4752 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4753 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4754 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4755 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4756 } 4757 4758 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4759 !Data.OverloadedMethods.empty()) { 4760 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4761 << MD << (Data.OverloadedMethods.size() > 1); 4762 4763 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4764 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4765 Diag(overloadedMD->getLocation(), 4766 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4767 } 4768 } 4769} 4770 4771void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4772 Decl *TagDecl, 4773 SourceLocation LBrac, 4774 SourceLocation RBrac, 4775 AttributeList *AttrList) { 4776 if (!TagDecl) 4777 return; 4778 4779 AdjustDeclIfTemplate(TagDecl); 4780 4781 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4782 // strict aliasing violation! 4783 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4784 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4785 4786 CheckCompletedCXXClass( 4787 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4788} 4789 4790/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4791/// special functions, such as the default constructor, copy 4792/// constructor, or destructor, to the given C++ class (C++ 4793/// [special]p1). This routine can only be executed just before the 4794/// definition of the class is complete. 4795void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4796 if (!ClassDecl->hasUserDeclaredConstructor()) 4797 ++ASTContext::NumImplicitDefaultConstructors; 4798 4799 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4800 ++ASTContext::NumImplicitCopyConstructors; 4801 4802 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4803 ++ASTContext::NumImplicitMoveConstructors; 4804 4805 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4806 ++ASTContext::NumImplicitCopyAssignmentOperators; 4807 4808 // If we have a dynamic class, then the copy assignment operator may be 4809 // virtual, so we have to declare it immediately. This ensures that, e.g., 4810 // it shows up in the right place in the vtable and that we diagnose 4811 // problems with the implicit exception specification. 4812 if (ClassDecl->isDynamicClass()) 4813 DeclareImplicitCopyAssignment(ClassDecl); 4814 } 4815 4816 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()){ 4817 ++ASTContext::NumImplicitMoveAssignmentOperators; 4818 4819 // Likewise for the move assignment operator. 4820 if (ClassDecl->isDynamicClass()) 4821 DeclareImplicitMoveAssignment(ClassDecl); 4822 } 4823 4824 if (!ClassDecl->hasUserDeclaredDestructor()) { 4825 ++ASTContext::NumImplicitDestructors; 4826 4827 // If we have a dynamic class, then the destructor may be virtual, so we 4828 // have to declare the destructor immediately. This ensures that, e.g., it 4829 // shows up in the right place in the vtable and that we diagnose problems 4830 // with the implicit exception specification. 4831 if (ClassDecl->isDynamicClass()) 4832 DeclareImplicitDestructor(ClassDecl); 4833 } 4834} 4835 4836void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4837 if (!D) 4838 return; 4839 4840 int NumParamList = D->getNumTemplateParameterLists(); 4841 for (int i = 0; i < NumParamList; i++) { 4842 TemplateParameterList* Params = D->getTemplateParameterList(i); 4843 for (TemplateParameterList::iterator Param = Params->begin(), 4844 ParamEnd = Params->end(); 4845 Param != ParamEnd; ++Param) { 4846 NamedDecl *Named = cast<NamedDecl>(*Param); 4847 if (Named->getDeclName()) { 4848 S->AddDecl(Named); 4849 IdResolver.AddDecl(Named); 4850 } 4851 } 4852 } 4853} 4854 4855void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4856 if (!D) 4857 return; 4858 4859 TemplateParameterList *Params = 0; 4860 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4861 Params = Template->getTemplateParameters(); 4862 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4863 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4864 Params = PartialSpec->getTemplateParameters(); 4865 else 4866 return; 4867 4868 for (TemplateParameterList::iterator Param = Params->begin(), 4869 ParamEnd = Params->end(); 4870 Param != ParamEnd; ++Param) { 4871 NamedDecl *Named = cast<NamedDecl>(*Param); 4872 if (Named->getDeclName()) { 4873 S->AddDecl(Named); 4874 IdResolver.AddDecl(Named); 4875 } 4876 } 4877} 4878 4879void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4880 if (!RecordD) return; 4881 AdjustDeclIfTemplate(RecordD); 4882 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4883 PushDeclContext(S, Record); 4884} 4885 4886void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4887 if (!RecordD) return; 4888 PopDeclContext(); 4889} 4890 4891/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4892/// parsing a top-level (non-nested) C++ class, and we are now 4893/// parsing those parts of the given Method declaration that could 4894/// not be parsed earlier (C++ [class.mem]p2), such as default 4895/// arguments. This action should enter the scope of the given 4896/// Method declaration as if we had just parsed the qualified method 4897/// name. However, it should not bring the parameters into scope; 4898/// that will be performed by ActOnDelayedCXXMethodParameter. 4899void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4900} 4901 4902/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4903/// C++ method declaration. We're (re-)introducing the given 4904/// function parameter into scope for use in parsing later parts of 4905/// the method declaration. For example, we could see an 4906/// ActOnParamDefaultArgument event for this parameter. 4907void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4908 if (!ParamD) 4909 return; 4910 4911 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4912 4913 // If this parameter has an unparsed default argument, clear it out 4914 // to make way for the parsed default argument. 4915 if (Param->hasUnparsedDefaultArg()) 4916 Param->setDefaultArg(0); 4917 4918 S->AddDecl(Param); 4919 if (Param->getDeclName()) 4920 IdResolver.AddDecl(Param); 4921} 4922 4923/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4924/// processing the delayed method declaration for Method. The method 4925/// declaration is now considered finished. There may be a separate 4926/// ActOnStartOfFunctionDef action later (not necessarily 4927/// immediately!) for this method, if it was also defined inside the 4928/// class body. 4929void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4930 if (!MethodD) 4931 return; 4932 4933 AdjustDeclIfTemplate(MethodD); 4934 4935 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4936 4937 // Now that we have our default arguments, check the constructor 4938 // again. It could produce additional diagnostics or affect whether 4939 // the class has implicitly-declared destructors, among other 4940 // things. 4941 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4942 CheckConstructor(Constructor); 4943 4944 // Check the default arguments, which we may have added. 4945 if (!Method->isInvalidDecl()) 4946 CheckCXXDefaultArguments(Method); 4947} 4948 4949/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4950/// the well-formedness of the constructor declarator @p D with type @p 4951/// R. If there are any errors in the declarator, this routine will 4952/// emit diagnostics and set the invalid bit to true. In any case, the type 4953/// will be updated to reflect a well-formed type for the constructor and 4954/// returned. 4955QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4956 StorageClass &SC) { 4957 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4958 4959 // C++ [class.ctor]p3: 4960 // A constructor shall not be virtual (10.3) or static (9.4). A 4961 // constructor can be invoked for a const, volatile or const 4962 // volatile object. A constructor shall not be declared const, 4963 // volatile, or const volatile (9.3.2). 4964 if (isVirtual) { 4965 if (!D.isInvalidType()) 4966 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4967 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4968 << SourceRange(D.getIdentifierLoc()); 4969 D.setInvalidType(); 4970 } 4971 if (SC == SC_Static) { 4972 if (!D.isInvalidType()) 4973 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4974 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4975 << SourceRange(D.getIdentifierLoc()); 4976 D.setInvalidType(); 4977 SC = SC_None; 4978 } 4979 4980 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4981 if (FTI.TypeQuals != 0) { 4982 if (FTI.TypeQuals & Qualifiers::Const) 4983 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4984 << "const" << SourceRange(D.getIdentifierLoc()); 4985 if (FTI.TypeQuals & Qualifiers::Volatile) 4986 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4987 << "volatile" << SourceRange(D.getIdentifierLoc()); 4988 if (FTI.TypeQuals & Qualifiers::Restrict) 4989 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4990 << "restrict" << SourceRange(D.getIdentifierLoc()); 4991 D.setInvalidType(); 4992 } 4993 4994 // C++0x [class.ctor]p4: 4995 // A constructor shall not be declared with a ref-qualifier. 4996 if (FTI.hasRefQualifier()) { 4997 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4998 << FTI.RefQualifierIsLValueRef 4999 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5000 D.setInvalidType(); 5001 } 5002 5003 // Rebuild the function type "R" without any type qualifiers (in 5004 // case any of the errors above fired) and with "void" as the 5005 // return type, since constructors don't have return types. 5006 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5007 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5008 return R; 5009 5010 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5011 EPI.TypeQuals = 0; 5012 EPI.RefQualifier = RQ_None; 5013 5014 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5015 Proto->getNumArgs(), EPI); 5016} 5017 5018/// CheckConstructor - Checks a fully-formed constructor for 5019/// well-formedness, issuing any diagnostics required. Returns true if 5020/// the constructor declarator is invalid. 5021void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5022 CXXRecordDecl *ClassDecl 5023 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5024 if (!ClassDecl) 5025 return Constructor->setInvalidDecl(); 5026 5027 // C++ [class.copy]p3: 5028 // A declaration of a constructor for a class X is ill-formed if 5029 // its first parameter is of type (optionally cv-qualified) X and 5030 // either there are no other parameters or else all other 5031 // parameters have default arguments. 5032 if (!Constructor->isInvalidDecl() && 5033 ((Constructor->getNumParams() == 1) || 5034 (Constructor->getNumParams() > 1 && 5035 Constructor->getParamDecl(1)->hasDefaultArg())) && 5036 Constructor->getTemplateSpecializationKind() 5037 != TSK_ImplicitInstantiation) { 5038 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5039 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5040 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5041 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5042 const char *ConstRef 5043 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5044 : " const &"; 5045 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5046 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5047 5048 // FIXME: Rather that making the constructor invalid, we should endeavor 5049 // to fix the type. 5050 Constructor->setInvalidDecl(); 5051 } 5052 } 5053} 5054 5055/// CheckDestructor - Checks a fully-formed destructor definition for 5056/// well-formedness, issuing any diagnostics required. Returns true 5057/// on error. 5058bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5059 CXXRecordDecl *RD = Destructor->getParent(); 5060 5061 if (Destructor->isVirtual()) { 5062 SourceLocation Loc; 5063 5064 if (!Destructor->isImplicit()) 5065 Loc = Destructor->getLocation(); 5066 else 5067 Loc = RD->getLocation(); 5068 5069 // If we have a virtual destructor, look up the deallocation function 5070 FunctionDecl *OperatorDelete = 0; 5071 DeclarationName Name = 5072 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5073 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5074 return true; 5075 5076 MarkFunctionReferenced(Loc, OperatorDelete); 5077 5078 Destructor->setOperatorDelete(OperatorDelete); 5079 } 5080 5081 return false; 5082} 5083 5084static inline bool 5085FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5086 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5087 FTI.ArgInfo[0].Param && 5088 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5089} 5090 5091/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5092/// the well-formednes of the destructor declarator @p D with type @p 5093/// R. If there are any errors in the declarator, this routine will 5094/// emit diagnostics and set the declarator to invalid. Even if this happens, 5095/// will be updated to reflect a well-formed type for the destructor and 5096/// returned. 5097QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5098 StorageClass& SC) { 5099 // C++ [class.dtor]p1: 5100 // [...] A typedef-name that names a class is a class-name 5101 // (7.1.3); however, a typedef-name that names a class shall not 5102 // be used as the identifier in the declarator for a destructor 5103 // declaration. 5104 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5105 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5106 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5107 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5108 else if (const TemplateSpecializationType *TST = 5109 DeclaratorType->getAs<TemplateSpecializationType>()) 5110 if (TST->isTypeAlias()) 5111 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5112 << DeclaratorType << 1; 5113 5114 // C++ [class.dtor]p2: 5115 // A destructor is used to destroy objects of its class type. A 5116 // destructor takes no parameters, and no return type can be 5117 // specified for it (not even void). The address of a destructor 5118 // shall not be taken. A destructor shall not be static. A 5119 // destructor can be invoked for a const, volatile or const 5120 // volatile object. A destructor shall not be declared const, 5121 // volatile or const volatile (9.3.2). 5122 if (SC == SC_Static) { 5123 if (!D.isInvalidType()) 5124 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5125 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5126 << SourceRange(D.getIdentifierLoc()) 5127 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5128 5129 SC = SC_None; 5130 } 5131 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5132 // Destructors don't have return types, but the parser will 5133 // happily parse something like: 5134 // 5135 // class X { 5136 // float ~X(); 5137 // }; 5138 // 5139 // The return type will be eliminated later. 5140 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5141 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5142 << SourceRange(D.getIdentifierLoc()); 5143 } 5144 5145 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5146 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5147 if (FTI.TypeQuals & Qualifiers::Const) 5148 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5149 << "const" << SourceRange(D.getIdentifierLoc()); 5150 if (FTI.TypeQuals & Qualifiers::Volatile) 5151 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5152 << "volatile" << SourceRange(D.getIdentifierLoc()); 5153 if (FTI.TypeQuals & Qualifiers::Restrict) 5154 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5155 << "restrict" << SourceRange(D.getIdentifierLoc()); 5156 D.setInvalidType(); 5157 } 5158 5159 // C++0x [class.dtor]p2: 5160 // A destructor shall not be declared with a ref-qualifier. 5161 if (FTI.hasRefQualifier()) { 5162 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5163 << FTI.RefQualifierIsLValueRef 5164 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5165 D.setInvalidType(); 5166 } 5167 5168 // Make sure we don't have any parameters. 5169 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5170 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5171 5172 // Delete the parameters. 5173 FTI.freeArgs(); 5174 D.setInvalidType(); 5175 } 5176 5177 // Make sure the destructor isn't variadic. 5178 if (FTI.isVariadic) { 5179 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5180 D.setInvalidType(); 5181 } 5182 5183 // Rebuild the function type "R" without any type qualifiers or 5184 // parameters (in case any of the errors above fired) and with 5185 // "void" as the return type, since destructors don't have return 5186 // types. 5187 if (!D.isInvalidType()) 5188 return R; 5189 5190 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5191 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5192 EPI.Variadic = false; 5193 EPI.TypeQuals = 0; 5194 EPI.RefQualifier = RQ_None; 5195 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5196} 5197 5198/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5199/// well-formednes of the conversion function declarator @p D with 5200/// type @p R. If there are any errors in the declarator, this routine 5201/// will emit diagnostics and return true. Otherwise, it will return 5202/// false. Either way, the type @p R will be updated to reflect a 5203/// well-formed type for the conversion operator. 5204void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5205 StorageClass& SC) { 5206 // C++ [class.conv.fct]p1: 5207 // Neither parameter types nor return type can be specified. The 5208 // type of a conversion function (8.3.5) is "function taking no 5209 // parameter returning conversion-type-id." 5210 if (SC == SC_Static) { 5211 if (!D.isInvalidType()) 5212 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5213 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5214 << SourceRange(D.getIdentifierLoc()); 5215 D.setInvalidType(); 5216 SC = SC_None; 5217 } 5218 5219 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5220 5221 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5222 // Conversion functions don't have return types, but the parser will 5223 // happily parse something like: 5224 // 5225 // class X { 5226 // float operator bool(); 5227 // }; 5228 // 5229 // The return type will be changed later anyway. 5230 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5231 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5232 << SourceRange(D.getIdentifierLoc()); 5233 D.setInvalidType(); 5234 } 5235 5236 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5237 5238 // Make sure we don't have any parameters. 5239 if (Proto->getNumArgs() > 0) { 5240 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5241 5242 // Delete the parameters. 5243 D.getFunctionTypeInfo().freeArgs(); 5244 D.setInvalidType(); 5245 } else if (Proto->isVariadic()) { 5246 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5247 D.setInvalidType(); 5248 } 5249 5250 // Diagnose "&operator bool()" and other such nonsense. This 5251 // is actually a gcc extension which we don't support. 5252 if (Proto->getResultType() != ConvType) { 5253 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5254 << Proto->getResultType(); 5255 D.setInvalidType(); 5256 ConvType = Proto->getResultType(); 5257 } 5258 5259 // C++ [class.conv.fct]p4: 5260 // The conversion-type-id shall not represent a function type nor 5261 // an array type. 5262 if (ConvType->isArrayType()) { 5263 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5264 ConvType = Context.getPointerType(ConvType); 5265 D.setInvalidType(); 5266 } else if (ConvType->isFunctionType()) { 5267 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5268 ConvType = Context.getPointerType(ConvType); 5269 D.setInvalidType(); 5270 } 5271 5272 // Rebuild the function type "R" without any parameters (in case any 5273 // of the errors above fired) and with the conversion type as the 5274 // return type. 5275 if (D.isInvalidType()) 5276 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5277 5278 // C++0x explicit conversion operators. 5279 if (D.getDeclSpec().isExplicitSpecified()) 5280 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5281 getLangOptions().CPlusPlus0x ? 5282 diag::warn_cxx98_compat_explicit_conversion_functions : 5283 diag::ext_explicit_conversion_functions) 5284 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5285} 5286 5287/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5288/// the declaration of the given C++ conversion function. This routine 5289/// is responsible for recording the conversion function in the C++ 5290/// class, if possible. 5291Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5292 assert(Conversion && "Expected to receive a conversion function declaration"); 5293 5294 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5295 5296 // Make sure we aren't redeclaring the conversion function. 5297 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5298 5299 // C++ [class.conv.fct]p1: 5300 // [...] A conversion function is never used to convert a 5301 // (possibly cv-qualified) object to the (possibly cv-qualified) 5302 // same object type (or a reference to it), to a (possibly 5303 // cv-qualified) base class of that type (or a reference to it), 5304 // or to (possibly cv-qualified) void. 5305 // FIXME: Suppress this warning if the conversion function ends up being a 5306 // virtual function that overrides a virtual function in a base class. 5307 QualType ClassType 5308 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5309 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5310 ConvType = ConvTypeRef->getPointeeType(); 5311 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5312 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5313 /* Suppress diagnostics for instantiations. */; 5314 else if (ConvType->isRecordType()) { 5315 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5316 if (ConvType == ClassType) 5317 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5318 << ClassType; 5319 else if (IsDerivedFrom(ClassType, ConvType)) 5320 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5321 << ClassType << ConvType; 5322 } else if (ConvType->isVoidType()) { 5323 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5324 << ClassType << ConvType; 5325 } 5326 5327 if (FunctionTemplateDecl *ConversionTemplate 5328 = Conversion->getDescribedFunctionTemplate()) 5329 return ConversionTemplate; 5330 5331 return Conversion; 5332} 5333 5334//===----------------------------------------------------------------------===// 5335// Namespace Handling 5336//===----------------------------------------------------------------------===// 5337 5338 5339 5340/// ActOnStartNamespaceDef - This is called at the start of a namespace 5341/// definition. 5342Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5343 SourceLocation InlineLoc, 5344 SourceLocation NamespaceLoc, 5345 SourceLocation IdentLoc, 5346 IdentifierInfo *II, 5347 SourceLocation LBrace, 5348 AttributeList *AttrList) { 5349 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5350 // For anonymous namespace, take the location of the left brace. 5351 SourceLocation Loc = II ? IdentLoc : LBrace; 5352 bool IsInline = InlineLoc.isValid(); 5353 bool IsInvalid = false; 5354 bool IsStd = false; 5355 bool AddToKnown = false; 5356 Scope *DeclRegionScope = NamespcScope->getParent(); 5357 5358 NamespaceDecl *PrevNS = 0; 5359 if (II) { 5360 // C++ [namespace.def]p2: 5361 // The identifier in an original-namespace-definition shall not 5362 // have been previously defined in the declarative region in 5363 // which the original-namespace-definition appears. The 5364 // identifier in an original-namespace-definition is the name of 5365 // the namespace. Subsequently in that declarative region, it is 5366 // treated as an original-namespace-name. 5367 // 5368 // Since namespace names are unique in their scope, and we don't 5369 // look through using directives, just look for any ordinary names. 5370 5371 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5372 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5373 Decl::IDNS_Namespace; 5374 NamedDecl *PrevDecl = 0; 5375 for (DeclContext::lookup_result R 5376 = CurContext->getRedeclContext()->lookup(II); 5377 R.first != R.second; ++R.first) { 5378 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5379 PrevDecl = *R.first; 5380 break; 5381 } 5382 } 5383 5384 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5385 5386 if (PrevNS) { 5387 // This is an extended namespace definition. 5388 if (IsInline != PrevNS->isInline()) { 5389 // inline-ness must match 5390 if (PrevNS->isInline()) { 5391 // The user probably just forgot the 'inline', so suggest that it 5392 // be added back. 5393 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5394 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5395 } else { 5396 Diag(Loc, diag::err_inline_namespace_mismatch) 5397 << IsInline; 5398 } 5399 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5400 5401 IsInline = PrevNS->isInline(); 5402 } 5403 } else if (PrevDecl) { 5404 // This is an invalid name redefinition. 5405 Diag(Loc, diag::err_redefinition_different_kind) 5406 << II; 5407 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5408 IsInvalid = true; 5409 // Continue on to push Namespc as current DeclContext and return it. 5410 } else if (II->isStr("std") && 5411 CurContext->getRedeclContext()->isTranslationUnit()) { 5412 // This is the first "real" definition of the namespace "std", so update 5413 // our cache of the "std" namespace to point at this definition. 5414 PrevNS = getStdNamespace(); 5415 IsStd = true; 5416 AddToKnown = !IsInline; 5417 } else { 5418 // We've seen this namespace for the first time. 5419 AddToKnown = !IsInline; 5420 } 5421 } else { 5422 // Anonymous namespaces. 5423 5424 // Determine whether the parent already has an anonymous namespace. 5425 DeclContext *Parent = CurContext->getRedeclContext(); 5426 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5427 PrevNS = TU->getAnonymousNamespace(); 5428 } else { 5429 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5430 PrevNS = ND->getAnonymousNamespace(); 5431 } 5432 5433 if (PrevNS && IsInline != PrevNS->isInline()) { 5434 // inline-ness must match 5435 Diag(Loc, diag::err_inline_namespace_mismatch) 5436 << IsInline; 5437 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5438 5439 // Recover by ignoring the new namespace's inline status. 5440 IsInline = PrevNS->isInline(); 5441 } 5442 } 5443 5444 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5445 StartLoc, Loc, II, PrevNS); 5446 if (IsInvalid) 5447 Namespc->setInvalidDecl(); 5448 5449 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5450 5451 // FIXME: Should we be merging attributes? 5452 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5453 PushNamespaceVisibilityAttr(Attr, Loc); 5454 5455 if (IsStd) 5456 StdNamespace = Namespc; 5457 if (AddToKnown) 5458 KnownNamespaces[Namespc] = false; 5459 5460 if (II) { 5461 PushOnScopeChains(Namespc, DeclRegionScope); 5462 } else { 5463 // Link the anonymous namespace into its parent. 5464 DeclContext *Parent = CurContext->getRedeclContext(); 5465 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5466 TU->setAnonymousNamespace(Namespc); 5467 } else { 5468 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5469 } 5470 5471 CurContext->addDecl(Namespc); 5472 5473 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5474 // behaves as if it were replaced by 5475 // namespace unique { /* empty body */ } 5476 // using namespace unique; 5477 // namespace unique { namespace-body } 5478 // where all occurrences of 'unique' in a translation unit are 5479 // replaced by the same identifier and this identifier differs 5480 // from all other identifiers in the entire program. 5481 5482 // We just create the namespace with an empty name and then add an 5483 // implicit using declaration, just like the standard suggests. 5484 // 5485 // CodeGen enforces the "universally unique" aspect by giving all 5486 // declarations semantically contained within an anonymous 5487 // namespace internal linkage. 5488 5489 if (!PrevNS) { 5490 UsingDirectiveDecl* UD 5491 = UsingDirectiveDecl::Create(Context, CurContext, 5492 /* 'using' */ LBrace, 5493 /* 'namespace' */ SourceLocation(), 5494 /* qualifier */ NestedNameSpecifierLoc(), 5495 /* identifier */ SourceLocation(), 5496 Namespc, 5497 /* Ancestor */ CurContext); 5498 UD->setImplicit(); 5499 CurContext->addDecl(UD); 5500 } 5501 } 5502 5503 // Although we could have an invalid decl (i.e. the namespace name is a 5504 // redefinition), push it as current DeclContext and try to continue parsing. 5505 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5506 // for the namespace has the declarations that showed up in that particular 5507 // namespace definition. 5508 PushDeclContext(NamespcScope, Namespc); 5509 return Namespc; 5510} 5511 5512/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5513/// is a namespace alias, returns the namespace it points to. 5514static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5515 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5516 return AD->getNamespace(); 5517 return dyn_cast_or_null<NamespaceDecl>(D); 5518} 5519 5520/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5521/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5522void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5523 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5524 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5525 Namespc->setRBraceLoc(RBrace); 5526 PopDeclContext(); 5527 if (Namespc->hasAttr<VisibilityAttr>()) 5528 PopPragmaVisibility(true, RBrace); 5529} 5530 5531CXXRecordDecl *Sema::getStdBadAlloc() const { 5532 return cast_or_null<CXXRecordDecl>( 5533 StdBadAlloc.get(Context.getExternalSource())); 5534} 5535 5536NamespaceDecl *Sema::getStdNamespace() const { 5537 return cast_or_null<NamespaceDecl>( 5538 StdNamespace.get(Context.getExternalSource())); 5539} 5540 5541/// \brief Retrieve the special "std" namespace, which may require us to 5542/// implicitly define the namespace. 5543NamespaceDecl *Sema::getOrCreateStdNamespace() { 5544 if (!StdNamespace) { 5545 // The "std" namespace has not yet been defined, so build one implicitly. 5546 StdNamespace = NamespaceDecl::Create(Context, 5547 Context.getTranslationUnitDecl(), 5548 /*Inline=*/false, 5549 SourceLocation(), SourceLocation(), 5550 &PP.getIdentifierTable().get("std"), 5551 /*PrevDecl=*/0); 5552 getStdNamespace()->setImplicit(true); 5553 } 5554 5555 return getStdNamespace(); 5556} 5557 5558bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5559 assert(getLangOptions().CPlusPlus && 5560 "Looking for std::initializer_list outside of C++."); 5561 5562 // We're looking for implicit instantiations of 5563 // template <typename E> class std::initializer_list. 5564 5565 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5566 return false; 5567 5568 ClassTemplateDecl *Template = 0; 5569 const TemplateArgument *Arguments = 0; 5570 5571 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5572 5573 ClassTemplateSpecializationDecl *Specialization = 5574 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5575 if (!Specialization) 5576 return false; 5577 5578 Template = Specialization->getSpecializedTemplate(); 5579 Arguments = Specialization->getTemplateArgs().data(); 5580 } else if (const TemplateSpecializationType *TST = 5581 Ty->getAs<TemplateSpecializationType>()) { 5582 Template = dyn_cast_or_null<ClassTemplateDecl>( 5583 TST->getTemplateName().getAsTemplateDecl()); 5584 Arguments = TST->getArgs(); 5585 } 5586 if (!Template) 5587 return false; 5588 5589 if (!StdInitializerList) { 5590 // Haven't recognized std::initializer_list yet, maybe this is it. 5591 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5592 if (TemplateClass->getIdentifier() != 5593 &PP.getIdentifierTable().get("initializer_list") || 5594 !getStdNamespace()->InEnclosingNamespaceSetOf( 5595 TemplateClass->getDeclContext())) 5596 return false; 5597 // This is a template called std::initializer_list, but is it the right 5598 // template? 5599 TemplateParameterList *Params = Template->getTemplateParameters(); 5600 if (Params->getMinRequiredArguments() != 1) 5601 return false; 5602 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5603 return false; 5604 5605 // It's the right template. 5606 StdInitializerList = Template; 5607 } 5608 5609 if (Template != StdInitializerList) 5610 return false; 5611 5612 // This is an instance of std::initializer_list. Find the argument type. 5613 if (Element) 5614 *Element = Arguments[0].getAsType(); 5615 return true; 5616} 5617 5618static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5619 NamespaceDecl *Std = S.getStdNamespace(); 5620 if (!Std) { 5621 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5622 return 0; 5623 } 5624 5625 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5626 Loc, Sema::LookupOrdinaryName); 5627 if (!S.LookupQualifiedName(Result, Std)) { 5628 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5629 return 0; 5630 } 5631 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5632 if (!Template) { 5633 Result.suppressDiagnostics(); 5634 // We found something weird. Complain about the first thing we found. 5635 NamedDecl *Found = *Result.begin(); 5636 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5637 return 0; 5638 } 5639 5640 // We found some template called std::initializer_list. Now verify that it's 5641 // correct. 5642 TemplateParameterList *Params = Template->getTemplateParameters(); 5643 if (Params->getMinRequiredArguments() != 1 || 5644 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5645 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5646 return 0; 5647 } 5648 5649 return Template; 5650} 5651 5652QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5653 if (!StdInitializerList) { 5654 StdInitializerList = LookupStdInitializerList(*this, Loc); 5655 if (!StdInitializerList) 5656 return QualType(); 5657 } 5658 5659 TemplateArgumentListInfo Args(Loc, Loc); 5660 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5661 Context.getTrivialTypeSourceInfo(Element, 5662 Loc))); 5663 return Context.getCanonicalType( 5664 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5665} 5666 5667bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5668 // C++ [dcl.init.list]p2: 5669 // A constructor is an initializer-list constructor if its first parameter 5670 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5671 // std::initializer_list<E> for some type E, and either there are no other 5672 // parameters or else all other parameters have default arguments. 5673 if (Ctor->getNumParams() < 1 || 5674 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5675 return false; 5676 5677 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5678 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5679 ArgType = RT->getPointeeType().getUnqualifiedType(); 5680 5681 return isStdInitializerList(ArgType, 0); 5682} 5683 5684/// \brief Determine whether a using statement is in a context where it will be 5685/// apply in all contexts. 5686static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5687 switch (CurContext->getDeclKind()) { 5688 case Decl::TranslationUnit: 5689 return true; 5690 case Decl::LinkageSpec: 5691 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5692 default: 5693 return false; 5694 } 5695} 5696 5697namespace { 5698 5699// Callback to only accept typo corrections that are namespaces. 5700class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5701 public: 5702 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5703 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5704 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5705 } 5706 return false; 5707 } 5708}; 5709 5710} 5711 5712static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5713 CXXScopeSpec &SS, 5714 SourceLocation IdentLoc, 5715 IdentifierInfo *Ident) { 5716 NamespaceValidatorCCC Validator; 5717 R.clear(); 5718 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5719 R.getLookupKind(), Sc, &SS, 5720 Validator)) { 5721 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5722 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5723 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5724 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5725 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5726 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5727 else 5728 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5729 << Ident << CorrectedQuotedStr 5730 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5731 5732 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5733 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5734 5735 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5736 R.addDecl(Corrected.getCorrectionDecl()); 5737 return true; 5738 } 5739 return false; 5740} 5741 5742Decl *Sema::ActOnUsingDirective(Scope *S, 5743 SourceLocation UsingLoc, 5744 SourceLocation NamespcLoc, 5745 CXXScopeSpec &SS, 5746 SourceLocation IdentLoc, 5747 IdentifierInfo *NamespcName, 5748 AttributeList *AttrList) { 5749 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5750 assert(NamespcName && "Invalid NamespcName."); 5751 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5752 5753 // This can only happen along a recovery path. 5754 while (S->getFlags() & Scope::TemplateParamScope) 5755 S = S->getParent(); 5756 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5757 5758 UsingDirectiveDecl *UDir = 0; 5759 NestedNameSpecifier *Qualifier = 0; 5760 if (SS.isSet()) 5761 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5762 5763 // Lookup namespace name. 5764 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5765 LookupParsedName(R, S, &SS); 5766 if (R.isAmbiguous()) 5767 return 0; 5768 5769 if (R.empty()) { 5770 R.clear(); 5771 // Allow "using namespace std;" or "using namespace ::std;" even if 5772 // "std" hasn't been defined yet, for GCC compatibility. 5773 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5774 NamespcName->isStr("std")) { 5775 Diag(IdentLoc, diag::ext_using_undefined_std); 5776 R.addDecl(getOrCreateStdNamespace()); 5777 R.resolveKind(); 5778 } 5779 // Otherwise, attempt typo correction. 5780 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5781 } 5782 5783 if (!R.empty()) { 5784 NamedDecl *Named = R.getFoundDecl(); 5785 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5786 && "expected namespace decl"); 5787 // C++ [namespace.udir]p1: 5788 // A using-directive specifies that the names in the nominated 5789 // namespace can be used in the scope in which the 5790 // using-directive appears after the using-directive. During 5791 // unqualified name lookup (3.4.1), the names appear as if they 5792 // were declared in the nearest enclosing namespace which 5793 // contains both the using-directive and the nominated 5794 // namespace. [Note: in this context, "contains" means "contains 5795 // directly or indirectly". ] 5796 5797 // Find enclosing context containing both using-directive and 5798 // nominated namespace. 5799 NamespaceDecl *NS = getNamespaceDecl(Named); 5800 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5801 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5802 CommonAncestor = CommonAncestor->getParent(); 5803 5804 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5805 SS.getWithLocInContext(Context), 5806 IdentLoc, Named, CommonAncestor); 5807 5808 if (IsUsingDirectiveInToplevelContext(CurContext) && 5809 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5810 Diag(IdentLoc, diag::warn_using_directive_in_header); 5811 } 5812 5813 PushUsingDirective(S, UDir); 5814 } else { 5815 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5816 } 5817 5818 // FIXME: We ignore attributes for now. 5819 return UDir; 5820} 5821 5822void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5823 // If scope has associated entity, then using directive is at namespace 5824 // or translation unit scope. We add UsingDirectiveDecls, into 5825 // it's lookup structure. 5826 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5827 Ctx->addDecl(UDir); 5828 else 5829 // Otherwise it is block-sope. using-directives will affect lookup 5830 // only to the end of scope. 5831 S->PushUsingDirective(UDir); 5832} 5833 5834 5835Decl *Sema::ActOnUsingDeclaration(Scope *S, 5836 AccessSpecifier AS, 5837 bool HasUsingKeyword, 5838 SourceLocation UsingLoc, 5839 CXXScopeSpec &SS, 5840 UnqualifiedId &Name, 5841 AttributeList *AttrList, 5842 bool IsTypeName, 5843 SourceLocation TypenameLoc) { 5844 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5845 5846 switch (Name.getKind()) { 5847 case UnqualifiedId::IK_ImplicitSelfParam: 5848 case UnqualifiedId::IK_Identifier: 5849 case UnqualifiedId::IK_OperatorFunctionId: 5850 case UnqualifiedId::IK_LiteralOperatorId: 5851 case UnqualifiedId::IK_ConversionFunctionId: 5852 break; 5853 5854 case UnqualifiedId::IK_ConstructorName: 5855 case UnqualifiedId::IK_ConstructorTemplateId: 5856 // C++0x inherited constructors. 5857 Diag(Name.getSourceRange().getBegin(), 5858 getLangOptions().CPlusPlus0x ? 5859 diag::warn_cxx98_compat_using_decl_constructor : 5860 diag::err_using_decl_constructor) 5861 << SS.getRange(); 5862 5863 if (getLangOptions().CPlusPlus0x) break; 5864 5865 return 0; 5866 5867 case UnqualifiedId::IK_DestructorName: 5868 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5869 << SS.getRange(); 5870 return 0; 5871 5872 case UnqualifiedId::IK_TemplateId: 5873 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5874 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5875 return 0; 5876 } 5877 5878 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5879 DeclarationName TargetName = TargetNameInfo.getName(); 5880 if (!TargetName) 5881 return 0; 5882 5883 // Warn about using declarations. 5884 // TODO: store that the declaration was written without 'using' and 5885 // talk about access decls instead of using decls in the 5886 // diagnostics. 5887 if (!HasUsingKeyword) { 5888 UsingLoc = Name.getSourceRange().getBegin(); 5889 5890 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5891 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5892 } 5893 5894 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5895 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5896 return 0; 5897 5898 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5899 TargetNameInfo, AttrList, 5900 /* IsInstantiation */ false, 5901 IsTypeName, TypenameLoc); 5902 if (UD) 5903 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5904 5905 return UD; 5906} 5907 5908/// \brief Determine whether a using declaration considers the given 5909/// declarations as "equivalent", e.g., if they are redeclarations of 5910/// the same entity or are both typedefs of the same type. 5911static bool 5912IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5913 bool &SuppressRedeclaration) { 5914 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5915 SuppressRedeclaration = false; 5916 return true; 5917 } 5918 5919 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5920 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5921 SuppressRedeclaration = true; 5922 return Context.hasSameType(TD1->getUnderlyingType(), 5923 TD2->getUnderlyingType()); 5924 } 5925 5926 return false; 5927} 5928 5929 5930/// Determines whether to create a using shadow decl for a particular 5931/// decl, given the set of decls existing prior to this using lookup. 5932bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5933 const LookupResult &Previous) { 5934 // Diagnose finding a decl which is not from a base class of the 5935 // current class. We do this now because there are cases where this 5936 // function will silently decide not to build a shadow decl, which 5937 // will pre-empt further diagnostics. 5938 // 5939 // We don't need to do this in C++0x because we do the check once on 5940 // the qualifier. 5941 // 5942 // FIXME: diagnose the following if we care enough: 5943 // struct A { int foo; }; 5944 // struct B : A { using A::foo; }; 5945 // template <class T> struct C : A {}; 5946 // template <class T> struct D : C<T> { using B::foo; } // <--- 5947 // This is invalid (during instantiation) in C++03 because B::foo 5948 // resolves to the using decl in B, which is not a base class of D<T>. 5949 // We can't diagnose it immediately because C<T> is an unknown 5950 // specialization. The UsingShadowDecl in D<T> then points directly 5951 // to A::foo, which will look well-formed when we instantiate. 5952 // The right solution is to not collapse the shadow-decl chain. 5953 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5954 DeclContext *OrigDC = Orig->getDeclContext(); 5955 5956 // Handle enums and anonymous structs. 5957 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5958 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5959 while (OrigRec->isAnonymousStructOrUnion()) 5960 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5961 5962 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5963 if (OrigDC == CurContext) { 5964 Diag(Using->getLocation(), 5965 diag::err_using_decl_nested_name_specifier_is_current_class) 5966 << Using->getQualifierLoc().getSourceRange(); 5967 Diag(Orig->getLocation(), diag::note_using_decl_target); 5968 return true; 5969 } 5970 5971 Diag(Using->getQualifierLoc().getBeginLoc(), 5972 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5973 << Using->getQualifier() 5974 << cast<CXXRecordDecl>(CurContext) 5975 << Using->getQualifierLoc().getSourceRange(); 5976 Diag(Orig->getLocation(), diag::note_using_decl_target); 5977 return true; 5978 } 5979 } 5980 5981 if (Previous.empty()) return false; 5982 5983 NamedDecl *Target = Orig; 5984 if (isa<UsingShadowDecl>(Target)) 5985 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5986 5987 // If the target happens to be one of the previous declarations, we 5988 // don't have a conflict. 5989 // 5990 // FIXME: but we might be increasing its access, in which case we 5991 // should redeclare it. 5992 NamedDecl *NonTag = 0, *Tag = 0; 5993 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5994 I != E; ++I) { 5995 NamedDecl *D = (*I)->getUnderlyingDecl(); 5996 bool Result; 5997 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5998 return Result; 5999 6000 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6001 } 6002 6003 if (Target->isFunctionOrFunctionTemplate()) { 6004 FunctionDecl *FD; 6005 if (isa<FunctionTemplateDecl>(Target)) 6006 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6007 else 6008 FD = cast<FunctionDecl>(Target); 6009 6010 NamedDecl *OldDecl = 0; 6011 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6012 case Ovl_Overload: 6013 return false; 6014 6015 case Ovl_NonFunction: 6016 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6017 break; 6018 6019 // We found a decl with the exact signature. 6020 case Ovl_Match: 6021 // If we're in a record, we want to hide the target, so we 6022 // return true (without a diagnostic) to tell the caller not to 6023 // build a shadow decl. 6024 if (CurContext->isRecord()) 6025 return true; 6026 6027 // If we're not in a record, this is an error. 6028 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6029 break; 6030 } 6031 6032 Diag(Target->getLocation(), diag::note_using_decl_target); 6033 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6034 return true; 6035 } 6036 6037 // Target is not a function. 6038 6039 if (isa<TagDecl>(Target)) { 6040 // No conflict between a tag and a non-tag. 6041 if (!Tag) return false; 6042 6043 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6044 Diag(Target->getLocation(), diag::note_using_decl_target); 6045 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6046 return true; 6047 } 6048 6049 // No conflict between a tag and a non-tag. 6050 if (!NonTag) return false; 6051 6052 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6053 Diag(Target->getLocation(), diag::note_using_decl_target); 6054 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6055 return true; 6056} 6057 6058/// Builds a shadow declaration corresponding to a 'using' declaration. 6059UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6060 UsingDecl *UD, 6061 NamedDecl *Orig) { 6062 6063 // If we resolved to another shadow declaration, just coalesce them. 6064 NamedDecl *Target = Orig; 6065 if (isa<UsingShadowDecl>(Target)) { 6066 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6067 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6068 } 6069 6070 UsingShadowDecl *Shadow 6071 = UsingShadowDecl::Create(Context, CurContext, 6072 UD->getLocation(), UD, Target); 6073 UD->addShadowDecl(Shadow); 6074 6075 Shadow->setAccess(UD->getAccess()); 6076 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6077 Shadow->setInvalidDecl(); 6078 6079 if (S) 6080 PushOnScopeChains(Shadow, S); 6081 else 6082 CurContext->addDecl(Shadow); 6083 6084 6085 return Shadow; 6086} 6087 6088/// Hides a using shadow declaration. This is required by the current 6089/// using-decl implementation when a resolvable using declaration in a 6090/// class is followed by a declaration which would hide or override 6091/// one or more of the using decl's targets; for example: 6092/// 6093/// struct Base { void foo(int); }; 6094/// struct Derived : Base { 6095/// using Base::foo; 6096/// void foo(int); 6097/// }; 6098/// 6099/// The governing language is C++03 [namespace.udecl]p12: 6100/// 6101/// When a using-declaration brings names from a base class into a 6102/// derived class scope, member functions in the derived class 6103/// override and/or hide member functions with the same name and 6104/// parameter types in a base class (rather than conflicting). 6105/// 6106/// There are two ways to implement this: 6107/// (1) optimistically create shadow decls when they're not hidden 6108/// by existing declarations, or 6109/// (2) don't create any shadow decls (or at least don't make them 6110/// visible) until we've fully parsed/instantiated the class. 6111/// The problem with (1) is that we might have to retroactively remove 6112/// a shadow decl, which requires several O(n) operations because the 6113/// decl structures are (very reasonably) not designed for removal. 6114/// (2) avoids this but is very fiddly and phase-dependent. 6115void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6116 if (Shadow->getDeclName().getNameKind() == 6117 DeclarationName::CXXConversionFunctionName) 6118 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6119 6120 // Remove it from the DeclContext... 6121 Shadow->getDeclContext()->removeDecl(Shadow); 6122 6123 // ...and the scope, if applicable... 6124 if (S) { 6125 S->RemoveDecl(Shadow); 6126 IdResolver.RemoveDecl(Shadow); 6127 } 6128 6129 // ...and the using decl. 6130 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6131 6132 // TODO: complain somehow if Shadow was used. It shouldn't 6133 // be possible for this to happen, because...? 6134} 6135 6136/// Builds a using declaration. 6137/// 6138/// \param IsInstantiation - Whether this call arises from an 6139/// instantiation of an unresolved using declaration. We treat 6140/// the lookup differently for these declarations. 6141NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6142 SourceLocation UsingLoc, 6143 CXXScopeSpec &SS, 6144 const DeclarationNameInfo &NameInfo, 6145 AttributeList *AttrList, 6146 bool IsInstantiation, 6147 bool IsTypeName, 6148 SourceLocation TypenameLoc) { 6149 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6150 SourceLocation IdentLoc = NameInfo.getLoc(); 6151 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6152 6153 // FIXME: We ignore attributes for now. 6154 6155 if (SS.isEmpty()) { 6156 Diag(IdentLoc, diag::err_using_requires_qualname); 6157 return 0; 6158 } 6159 6160 // Do the redeclaration lookup in the current scope. 6161 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6162 ForRedeclaration); 6163 Previous.setHideTags(false); 6164 if (S) { 6165 LookupName(Previous, S); 6166 6167 // It is really dumb that we have to do this. 6168 LookupResult::Filter F = Previous.makeFilter(); 6169 while (F.hasNext()) { 6170 NamedDecl *D = F.next(); 6171 if (!isDeclInScope(D, CurContext, S)) 6172 F.erase(); 6173 } 6174 F.done(); 6175 } else { 6176 assert(IsInstantiation && "no scope in non-instantiation"); 6177 assert(CurContext->isRecord() && "scope not record in instantiation"); 6178 LookupQualifiedName(Previous, CurContext); 6179 } 6180 6181 // Check for invalid redeclarations. 6182 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6183 return 0; 6184 6185 // Check for bad qualifiers. 6186 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6187 return 0; 6188 6189 DeclContext *LookupContext = computeDeclContext(SS); 6190 NamedDecl *D; 6191 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6192 if (!LookupContext) { 6193 if (IsTypeName) { 6194 // FIXME: not all declaration name kinds are legal here 6195 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6196 UsingLoc, TypenameLoc, 6197 QualifierLoc, 6198 IdentLoc, NameInfo.getName()); 6199 } else { 6200 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6201 QualifierLoc, NameInfo); 6202 } 6203 } else { 6204 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6205 NameInfo, IsTypeName); 6206 } 6207 D->setAccess(AS); 6208 CurContext->addDecl(D); 6209 6210 if (!LookupContext) return D; 6211 UsingDecl *UD = cast<UsingDecl>(D); 6212 6213 if (RequireCompleteDeclContext(SS, LookupContext)) { 6214 UD->setInvalidDecl(); 6215 return UD; 6216 } 6217 6218 // Constructor inheriting using decls get special treatment. 6219 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6220 if (CheckInheritedConstructorUsingDecl(UD)) 6221 UD->setInvalidDecl(); 6222 return UD; 6223 } 6224 6225 // Otherwise, look up the target name. 6226 6227 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6228 6229 // Unlike most lookups, we don't always want to hide tag 6230 // declarations: tag names are visible through the using declaration 6231 // even if hidden by ordinary names, *except* in a dependent context 6232 // where it's important for the sanity of two-phase lookup. 6233 if (!IsInstantiation) 6234 R.setHideTags(false); 6235 6236 LookupQualifiedName(R, LookupContext); 6237 6238 if (R.empty()) { 6239 Diag(IdentLoc, diag::err_no_member) 6240 << NameInfo.getName() << LookupContext << SS.getRange(); 6241 UD->setInvalidDecl(); 6242 return UD; 6243 } 6244 6245 if (R.isAmbiguous()) { 6246 UD->setInvalidDecl(); 6247 return UD; 6248 } 6249 6250 if (IsTypeName) { 6251 // If we asked for a typename and got a non-type decl, error out. 6252 if (!R.getAsSingle<TypeDecl>()) { 6253 Diag(IdentLoc, diag::err_using_typename_non_type); 6254 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6255 Diag((*I)->getUnderlyingDecl()->getLocation(), 6256 diag::note_using_decl_target); 6257 UD->setInvalidDecl(); 6258 return UD; 6259 } 6260 } else { 6261 // If we asked for a non-typename and we got a type, error out, 6262 // but only if this is an instantiation of an unresolved using 6263 // decl. Otherwise just silently find the type name. 6264 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6265 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6266 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6267 UD->setInvalidDecl(); 6268 return UD; 6269 } 6270 } 6271 6272 // C++0x N2914 [namespace.udecl]p6: 6273 // A using-declaration shall not name a namespace. 6274 if (R.getAsSingle<NamespaceDecl>()) { 6275 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6276 << SS.getRange(); 6277 UD->setInvalidDecl(); 6278 return UD; 6279 } 6280 6281 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6282 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6283 BuildUsingShadowDecl(S, UD, *I); 6284 } 6285 6286 return UD; 6287} 6288 6289/// Additional checks for a using declaration referring to a constructor name. 6290bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6291 if (UD->isTypeName()) { 6292 // FIXME: Cannot specify typename when specifying constructor 6293 return true; 6294 } 6295 6296 const Type *SourceType = UD->getQualifier()->getAsType(); 6297 assert(SourceType && 6298 "Using decl naming constructor doesn't have type in scope spec."); 6299 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6300 6301 // Check whether the named type is a direct base class. 6302 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6303 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6304 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6305 BaseIt != BaseE; ++BaseIt) { 6306 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6307 if (CanonicalSourceType == BaseType) 6308 break; 6309 } 6310 6311 if (BaseIt == BaseE) { 6312 // Did not find SourceType in the bases. 6313 Diag(UD->getUsingLocation(), 6314 diag::err_using_decl_constructor_not_in_direct_base) 6315 << UD->getNameInfo().getSourceRange() 6316 << QualType(SourceType, 0) << TargetClass; 6317 return true; 6318 } 6319 6320 BaseIt->setInheritConstructors(); 6321 6322 return false; 6323} 6324 6325/// Checks that the given using declaration is not an invalid 6326/// redeclaration. Note that this is checking only for the using decl 6327/// itself, not for any ill-formedness among the UsingShadowDecls. 6328bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6329 bool isTypeName, 6330 const CXXScopeSpec &SS, 6331 SourceLocation NameLoc, 6332 const LookupResult &Prev) { 6333 // C++03 [namespace.udecl]p8: 6334 // C++0x [namespace.udecl]p10: 6335 // A using-declaration is a declaration and can therefore be used 6336 // repeatedly where (and only where) multiple declarations are 6337 // allowed. 6338 // 6339 // That's in non-member contexts. 6340 if (!CurContext->getRedeclContext()->isRecord()) 6341 return false; 6342 6343 NestedNameSpecifier *Qual 6344 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6345 6346 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6347 NamedDecl *D = *I; 6348 6349 bool DTypename; 6350 NestedNameSpecifier *DQual; 6351 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6352 DTypename = UD->isTypeName(); 6353 DQual = UD->getQualifier(); 6354 } else if (UnresolvedUsingValueDecl *UD 6355 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6356 DTypename = false; 6357 DQual = UD->getQualifier(); 6358 } else if (UnresolvedUsingTypenameDecl *UD 6359 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6360 DTypename = true; 6361 DQual = UD->getQualifier(); 6362 } else continue; 6363 6364 // using decls differ if one says 'typename' and the other doesn't. 6365 // FIXME: non-dependent using decls? 6366 if (isTypeName != DTypename) continue; 6367 6368 // using decls differ if they name different scopes (but note that 6369 // template instantiation can cause this check to trigger when it 6370 // didn't before instantiation). 6371 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6372 Context.getCanonicalNestedNameSpecifier(DQual)) 6373 continue; 6374 6375 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6376 Diag(D->getLocation(), diag::note_using_decl) << 1; 6377 return true; 6378 } 6379 6380 return false; 6381} 6382 6383 6384/// Checks that the given nested-name qualifier used in a using decl 6385/// in the current context is appropriately related to the current 6386/// scope. If an error is found, diagnoses it and returns true. 6387bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6388 const CXXScopeSpec &SS, 6389 SourceLocation NameLoc) { 6390 DeclContext *NamedContext = computeDeclContext(SS); 6391 6392 if (!CurContext->isRecord()) { 6393 // C++03 [namespace.udecl]p3: 6394 // C++0x [namespace.udecl]p8: 6395 // A using-declaration for a class member shall be a member-declaration. 6396 6397 // If we weren't able to compute a valid scope, it must be a 6398 // dependent class scope. 6399 if (!NamedContext || NamedContext->isRecord()) { 6400 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6401 << SS.getRange(); 6402 return true; 6403 } 6404 6405 // Otherwise, everything is known to be fine. 6406 return false; 6407 } 6408 6409 // The current scope is a record. 6410 6411 // If the named context is dependent, we can't decide much. 6412 if (!NamedContext) { 6413 // FIXME: in C++0x, we can diagnose if we can prove that the 6414 // nested-name-specifier does not refer to a base class, which is 6415 // still possible in some cases. 6416 6417 // Otherwise we have to conservatively report that things might be 6418 // okay. 6419 return false; 6420 } 6421 6422 if (!NamedContext->isRecord()) { 6423 // Ideally this would point at the last name in the specifier, 6424 // but we don't have that level of source info. 6425 Diag(SS.getRange().getBegin(), 6426 diag::err_using_decl_nested_name_specifier_is_not_class) 6427 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6428 return true; 6429 } 6430 6431 if (!NamedContext->isDependentContext() && 6432 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6433 return true; 6434 6435 if (getLangOptions().CPlusPlus0x) { 6436 // C++0x [namespace.udecl]p3: 6437 // In a using-declaration used as a member-declaration, the 6438 // nested-name-specifier shall name a base class of the class 6439 // being defined. 6440 6441 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6442 cast<CXXRecordDecl>(NamedContext))) { 6443 if (CurContext == NamedContext) { 6444 Diag(NameLoc, 6445 diag::err_using_decl_nested_name_specifier_is_current_class) 6446 << SS.getRange(); 6447 return true; 6448 } 6449 6450 Diag(SS.getRange().getBegin(), 6451 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6452 << (NestedNameSpecifier*) SS.getScopeRep() 6453 << cast<CXXRecordDecl>(CurContext) 6454 << SS.getRange(); 6455 return true; 6456 } 6457 6458 return false; 6459 } 6460 6461 // C++03 [namespace.udecl]p4: 6462 // A using-declaration used as a member-declaration shall refer 6463 // to a member of a base class of the class being defined [etc.]. 6464 6465 // Salient point: SS doesn't have to name a base class as long as 6466 // lookup only finds members from base classes. Therefore we can 6467 // diagnose here only if we can prove that that can't happen, 6468 // i.e. if the class hierarchies provably don't intersect. 6469 6470 // TODO: it would be nice if "definitely valid" results were cached 6471 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6472 // need to be repeated. 6473 6474 struct UserData { 6475 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6476 6477 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6478 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6479 Data->Bases.insert(Base); 6480 return true; 6481 } 6482 6483 bool hasDependentBases(const CXXRecordDecl *Class) { 6484 return !Class->forallBases(collect, this); 6485 } 6486 6487 /// Returns true if the base is dependent or is one of the 6488 /// accumulated base classes. 6489 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6490 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6491 return !Data->Bases.count(Base); 6492 } 6493 6494 bool mightShareBases(const CXXRecordDecl *Class) { 6495 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6496 } 6497 }; 6498 6499 UserData Data; 6500 6501 // Returns false if we find a dependent base. 6502 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6503 return false; 6504 6505 // Returns false if the class has a dependent base or if it or one 6506 // of its bases is present in the base set of the current context. 6507 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6508 return false; 6509 6510 Diag(SS.getRange().getBegin(), 6511 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6512 << (NestedNameSpecifier*) SS.getScopeRep() 6513 << cast<CXXRecordDecl>(CurContext) 6514 << SS.getRange(); 6515 6516 return true; 6517} 6518 6519Decl *Sema::ActOnAliasDeclaration(Scope *S, 6520 AccessSpecifier AS, 6521 MultiTemplateParamsArg TemplateParamLists, 6522 SourceLocation UsingLoc, 6523 UnqualifiedId &Name, 6524 TypeResult Type) { 6525 // Skip up to the relevant declaration scope. 6526 while (S->getFlags() & Scope::TemplateParamScope) 6527 S = S->getParent(); 6528 assert((S->getFlags() & Scope::DeclScope) && 6529 "got alias-declaration outside of declaration scope"); 6530 6531 if (Type.isInvalid()) 6532 return 0; 6533 6534 bool Invalid = false; 6535 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6536 TypeSourceInfo *TInfo = 0; 6537 GetTypeFromParser(Type.get(), &TInfo); 6538 6539 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6540 return 0; 6541 6542 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6543 UPPC_DeclarationType)) { 6544 Invalid = true; 6545 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6546 TInfo->getTypeLoc().getBeginLoc()); 6547 } 6548 6549 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6550 LookupName(Previous, S); 6551 6552 // Warn about shadowing the name of a template parameter. 6553 if (Previous.isSingleResult() && 6554 Previous.getFoundDecl()->isTemplateParameter()) { 6555 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6556 Previous.clear(); 6557 } 6558 6559 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6560 "name in alias declaration must be an identifier"); 6561 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6562 Name.StartLocation, 6563 Name.Identifier, TInfo); 6564 6565 NewTD->setAccess(AS); 6566 6567 if (Invalid) 6568 NewTD->setInvalidDecl(); 6569 6570 CheckTypedefForVariablyModifiedType(S, NewTD); 6571 Invalid |= NewTD->isInvalidDecl(); 6572 6573 bool Redeclaration = false; 6574 6575 NamedDecl *NewND; 6576 if (TemplateParamLists.size()) { 6577 TypeAliasTemplateDecl *OldDecl = 0; 6578 TemplateParameterList *OldTemplateParams = 0; 6579 6580 if (TemplateParamLists.size() != 1) { 6581 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6582 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6583 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6584 } 6585 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6586 6587 // Only consider previous declarations in the same scope. 6588 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6589 /*ExplicitInstantiationOrSpecialization*/false); 6590 if (!Previous.empty()) { 6591 Redeclaration = true; 6592 6593 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6594 if (!OldDecl && !Invalid) { 6595 Diag(UsingLoc, diag::err_redefinition_different_kind) 6596 << Name.Identifier; 6597 6598 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6599 if (OldD->getLocation().isValid()) 6600 Diag(OldD->getLocation(), diag::note_previous_definition); 6601 6602 Invalid = true; 6603 } 6604 6605 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6606 if (TemplateParameterListsAreEqual(TemplateParams, 6607 OldDecl->getTemplateParameters(), 6608 /*Complain=*/true, 6609 TPL_TemplateMatch)) 6610 OldTemplateParams = OldDecl->getTemplateParameters(); 6611 else 6612 Invalid = true; 6613 6614 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6615 if (!Invalid && 6616 !Context.hasSameType(OldTD->getUnderlyingType(), 6617 NewTD->getUnderlyingType())) { 6618 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6619 // but we can't reasonably accept it. 6620 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6621 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6622 if (OldTD->getLocation().isValid()) 6623 Diag(OldTD->getLocation(), diag::note_previous_definition); 6624 Invalid = true; 6625 } 6626 } 6627 } 6628 6629 // Merge any previous default template arguments into our parameters, 6630 // and check the parameter list. 6631 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6632 TPC_TypeAliasTemplate)) 6633 return 0; 6634 6635 TypeAliasTemplateDecl *NewDecl = 6636 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6637 Name.Identifier, TemplateParams, 6638 NewTD); 6639 6640 NewDecl->setAccess(AS); 6641 6642 if (Invalid) 6643 NewDecl->setInvalidDecl(); 6644 else if (OldDecl) 6645 NewDecl->setPreviousDeclaration(OldDecl); 6646 6647 NewND = NewDecl; 6648 } else { 6649 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6650 NewND = NewTD; 6651 } 6652 6653 if (!Redeclaration) 6654 PushOnScopeChains(NewND, S); 6655 6656 return NewND; 6657} 6658 6659Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6660 SourceLocation NamespaceLoc, 6661 SourceLocation AliasLoc, 6662 IdentifierInfo *Alias, 6663 CXXScopeSpec &SS, 6664 SourceLocation IdentLoc, 6665 IdentifierInfo *Ident) { 6666 6667 // Lookup the namespace name. 6668 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6669 LookupParsedName(R, S, &SS); 6670 6671 // Check if we have a previous declaration with the same name. 6672 NamedDecl *PrevDecl 6673 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6674 ForRedeclaration); 6675 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6676 PrevDecl = 0; 6677 6678 if (PrevDecl) { 6679 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6680 // We already have an alias with the same name that points to the same 6681 // namespace, so don't create a new one. 6682 // FIXME: At some point, we'll want to create the (redundant) 6683 // declaration to maintain better source information. 6684 if (!R.isAmbiguous() && !R.empty() && 6685 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6686 return 0; 6687 } 6688 6689 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6690 diag::err_redefinition_different_kind; 6691 Diag(AliasLoc, DiagID) << Alias; 6692 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6693 return 0; 6694 } 6695 6696 if (R.isAmbiguous()) 6697 return 0; 6698 6699 if (R.empty()) { 6700 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6701 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6702 return 0; 6703 } 6704 } 6705 6706 NamespaceAliasDecl *AliasDecl = 6707 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6708 Alias, SS.getWithLocInContext(Context), 6709 IdentLoc, R.getFoundDecl()); 6710 6711 PushOnScopeChains(AliasDecl, S); 6712 return AliasDecl; 6713} 6714 6715namespace { 6716 /// \brief Scoped object used to handle the state changes required in Sema 6717 /// to implicitly define the body of a C++ member function; 6718 class ImplicitlyDefinedFunctionScope { 6719 Sema &S; 6720 Sema::ContextRAII SavedContext; 6721 6722 public: 6723 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6724 : S(S), SavedContext(S, Method) 6725 { 6726 S.PushFunctionScope(); 6727 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6728 } 6729 6730 ~ImplicitlyDefinedFunctionScope() { 6731 S.PopExpressionEvaluationContext(); 6732 S.PopFunctionScopeInfo(); 6733 } 6734 }; 6735} 6736 6737Sema::ImplicitExceptionSpecification 6738Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6739 // C++ [except.spec]p14: 6740 // An implicitly declared special member function (Clause 12) shall have an 6741 // exception-specification. [...] 6742 ImplicitExceptionSpecification ExceptSpec(Context); 6743 if (ClassDecl->isInvalidDecl()) 6744 return ExceptSpec; 6745 6746 // Direct base-class constructors. 6747 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6748 BEnd = ClassDecl->bases_end(); 6749 B != BEnd; ++B) { 6750 if (B->isVirtual()) // Handled below. 6751 continue; 6752 6753 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6754 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6755 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6756 // If this is a deleted function, add it anyway. This might be conformant 6757 // with the standard. This might not. I'm not sure. It might not matter. 6758 if (Constructor) 6759 ExceptSpec.CalledDecl(Constructor); 6760 } 6761 } 6762 6763 // Virtual base-class constructors. 6764 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6765 BEnd = ClassDecl->vbases_end(); 6766 B != BEnd; ++B) { 6767 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6768 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6769 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6770 // If this is a deleted function, add it anyway. This might be conformant 6771 // with the standard. This might not. I'm not sure. It might not matter. 6772 if (Constructor) 6773 ExceptSpec.CalledDecl(Constructor); 6774 } 6775 } 6776 6777 // Field constructors. 6778 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6779 FEnd = ClassDecl->field_end(); 6780 F != FEnd; ++F) { 6781 if (F->hasInClassInitializer()) { 6782 if (Expr *E = F->getInClassInitializer()) 6783 ExceptSpec.CalledExpr(E); 6784 else if (!F->isInvalidDecl()) 6785 ExceptSpec.SetDelayed(); 6786 } else if (const RecordType *RecordTy 6787 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6788 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6789 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6790 // If this is a deleted function, add it anyway. This might be conformant 6791 // with the standard. This might not. I'm not sure. It might not matter. 6792 // In particular, the problem is that this function never gets called. It 6793 // might just be ill-formed because this function attempts to refer to 6794 // a deleted function here. 6795 if (Constructor) 6796 ExceptSpec.CalledDecl(Constructor); 6797 } 6798 } 6799 6800 return ExceptSpec; 6801} 6802 6803CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6804 CXXRecordDecl *ClassDecl) { 6805 // C++ [class.ctor]p5: 6806 // A default constructor for a class X is a constructor of class X 6807 // that can be called without an argument. If there is no 6808 // user-declared constructor for class X, a default constructor is 6809 // implicitly declared. An implicitly-declared default constructor 6810 // is an inline public member of its class. 6811 assert(!ClassDecl->hasUserDeclaredConstructor() && 6812 "Should not build implicit default constructor!"); 6813 6814 ImplicitExceptionSpecification Spec = 6815 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6816 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6817 6818 // Create the actual constructor declaration. 6819 CanQualType ClassType 6820 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6821 SourceLocation ClassLoc = ClassDecl->getLocation(); 6822 DeclarationName Name 6823 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6824 DeclarationNameInfo NameInfo(Name, ClassLoc); 6825 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6826 Context, ClassDecl, ClassLoc, NameInfo, 6827 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6828 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6829 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 6830 getLangOptions().CPlusPlus0x); 6831 DefaultCon->setAccess(AS_public); 6832 DefaultCon->setDefaulted(); 6833 DefaultCon->setImplicit(); 6834 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6835 6836 // Note that we have declared this constructor. 6837 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6838 6839 if (Scope *S = getScopeForContext(ClassDecl)) 6840 PushOnScopeChains(DefaultCon, S, false); 6841 ClassDecl->addDecl(DefaultCon); 6842 6843 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6844 DefaultCon->setDeletedAsWritten(); 6845 6846 return DefaultCon; 6847} 6848 6849void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6850 CXXConstructorDecl *Constructor) { 6851 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6852 !Constructor->doesThisDeclarationHaveABody() && 6853 !Constructor->isDeleted()) && 6854 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6855 6856 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6857 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6858 6859 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6860 DiagnosticErrorTrap Trap(Diags); 6861 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6862 Trap.hasErrorOccurred()) { 6863 Diag(CurrentLocation, diag::note_member_synthesized_at) 6864 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6865 Constructor->setInvalidDecl(); 6866 return; 6867 } 6868 6869 SourceLocation Loc = Constructor->getLocation(); 6870 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6871 6872 Constructor->setUsed(); 6873 MarkVTableUsed(CurrentLocation, ClassDecl); 6874 6875 if (ASTMutationListener *L = getASTMutationListener()) { 6876 L->CompletedImplicitDefinition(Constructor); 6877 } 6878} 6879 6880/// Get any existing defaulted default constructor for the given class. Do not 6881/// implicitly define one if it does not exist. 6882static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6883 CXXRecordDecl *D) { 6884 ASTContext &Context = Self.Context; 6885 QualType ClassType = Context.getTypeDeclType(D); 6886 DeclarationName ConstructorName 6887 = Context.DeclarationNames.getCXXConstructorName( 6888 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6889 6890 DeclContext::lookup_const_iterator Con, ConEnd; 6891 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6892 Con != ConEnd; ++Con) { 6893 // A function template cannot be defaulted. 6894 if (isa<FunctionTemplateDecl>(*Con)) 6895 continue; 6896 6897 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6898 if (Constructor->isDefaultConstructor()) 6899 return Constructor->isDefaulted() ? Constructor : 0; 6900 } 6901 return 0; 6902} 6903 6904void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6905 if (!D) return; 6906 AdjustDeclIfTemplate(D); 6907 6908 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6909 CXXConstructorDecl *CtorDecl 6910 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6911 6912 if (!CtorDecl) return; 6913 6914 // Compute the exception specification for the default constructor. 6915 const FunctionProtoType *CtorTy = 6916 CtorDecl->getType()->castAs<FunctionProtoType>(); 6917 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6918 ImplicitExceptionSpecification Spec = 6919 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6920 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6921 assert(EPI.ExceptionSpecType != EST_Delayed); 6922 6923 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6924 } 6925 6926 // If the default constructor is explicitly defaulted, checking the exception 6927 // specification is deferred until now. 6928 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6929 !ClassDecl->isDependentType()) 6930 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6931} 6932 6933void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6934 // We start with an initial pass over the base classes to collect those that 6935 // inherit constructors from. If there are none, we can forgo all further 6936 // processing. 6937 typedef SmallVector<const RecordType *, 4> BasesVector; 6938 BasesVector BasesToInheritFrom; 6939 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6940 BaseE = ClassDecl->bases_end(); 6941 BaseIt != BaseE; ++BaseIt) { 6942 if (BaseIt->getInheritConstructors()) { 6943 QualType Base = BaseIt->getType(); 6944 if (Base->isDependentType()) { 6945 // If we inherit constructors from anything that is dependent, just 6946 // abort processing altogether. We'll get another chance for the 6947 // instantiations. 6948 return; 6949 } 6950 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6951 } 6952 } 6953 if (BasesToInheritFrom.empty()) 6954 return; 6955 6956 // Now collect the constructors that we already have in the current class. 6957 // Those take precedence over inherited constructors. 6958 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6959 // unless there is a user-declared constructor with the same signature in 6960 // the class where the using-declaration appears. 6961 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6962 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6963 CtorE = ClassDecl->ctor_end(); 6964 CtorIt != CtorE; ++CtorIt) { 6965 ExistingConstructors.insert( 6966 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6967 } 6968 6969 Scope *S = getScopeForContext(ClassDecl); 6970 DeclarationName CreatedCtorName = 6971 Context.DeclarationNames.getCXXConstructorName( 6972 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6973 6974 // Now comes the true work. 6975 // First, we keep a map from constructor types to the base that introduced 6976 // them. Needed for finding conflicting constructors. We also keep the 6977 // actually inserted declarations in there, for pretty diagnostics. 6978 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6979 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6980 ConstructorToSourceMap InheritedConstructors; 6981 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6982 BaseE = BasesToInheritFrom.end(); 6983 BaseIt != BaseE; ++BaseIt) { 6984 const RecordType *Base = *BaseIt; 6985 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6986 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6987 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6988 CtorE = BaseDecl->ctor_end(); 6989 CtorIt != CtorE; ++CtorIt) { 6990 // Find the using declaration for inheriting this base's constructors. 6991 DeclarationName Name = 6992 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6993 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6994 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6995 SourceLocation UsingLoc = UD ? UD->getLocation() : 6996 ClassDecl->getLocation(); 6997 6998 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6999 // from the class X named in the using-declaration consists of actual 7000 // constructors and notional constructors that result from the 7001 // transformation of defaulted parameters as follows: 7002 // - all non-template default constructors of X, and 7003 // - for each non-template constructor of X that has at least one 7004 // parameter with a default argument, the set of constructors that 7005 // results from omitting any ellipsis parameter specification and 7006 // successively omitting parameters with a default argument from the 7007 // end of the parameter-type-list. 7008 CXXConstructorDecl *BaseCtor = *CtorIt; 7009 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7010 const FunctionProtoType *BaseCtorType = 7011 BaseCtor->getType()->getAs<FunctionProtoType>(); 7012 7013 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7014 maxParams = BaseCtor->getNumParams(); 7015 params <= maxParams; ++params) { 7016 // Skip default constructors. They're never inherited. 7017 if (params == 0) 7018 continue; 7019 // Skip copy and move constructors for the same reason. 7020 if (CanBeCopyOrMove && params == 1) 7021 continue; 7022 7023 // Build up a function type for this particular constructor. 7024 // FIXME: The working paper does not consider that the exception spec 7025 // for the inheriting constructor might be larger than that of the 7026 // source. This code doesn't yet, either. When it does, this code will 7027 // need to be delayed until after exception specifications and in-class 7028 // member initializers are attached. 7029 const Type *NewCtorType; 7030 if (params == maxParams) 7031 NewCtorType = BaseCtorType; 7032 else { 7033 SmallVector<QualType, 16> Args; 7034 for (unsigned i = 0; i < params; ++i) { 7035 Args.push_back(BaseCtorType->getArgType(i)); 7036 } 7037 FunctionProtoType::ExtProtoInfo ExtInfo = 7038 BaseCtorType->getExtProtoInfo(); 7039 ExtInfo.Variadic = false; 7040 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7041 Args.data(), params, ExtInfo) 7042 .getTypePtr(); 7043 } 7044 const Type *CanonicalNewCtorType = 7045 Context.getCanonicalType(NewCtorType); 7046 7047 // Now that we have the type, first check if the class already has a 7048 // constructor with this signature. 7049 if (ExistingConstructors.count(CanonicalNewCtorType)) 7050 continue; 7051 7052 // Then we check if we have already declared an inherited constructor 7053 // with this signature. 7054 std::pair<ConstructorToSourceMap::iterator, bool> result = 7055 InheritedConstructors.insert(std::make_pair( 7056 CanonicalNewCtorType, 7057 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7058 if (!result.second) { 7059 // Already in the map. If it came from a different class, that's an 7060 // error. Not if it's from the same. 7061 CanQualType PreviousBase = result.first->second.first; 7062 if (CanonicalBase != PreviousBase) { 7063 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7064 const CXXConstructorDecl *PrevBaseCtor = 7065 PrevCtor->getInheritedConstructor(); 7066 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7067 7068 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7069 Diag(BaseCtor->getLocation(), 7070 diag::note_using_decl_constructor_conflict_current_ctor); 7071 Diag(PrevBaseCtor->getLocation(), 7072 diag::note_using_decl_constructor_conflict_previous_ctor); 7073 Diag(PrevCtor->getLocation(), 7074 diag::note_using_decl_constructor_conflict_previous_using); 7075 } 7076 continue; 7077 } 7078 7079 // OK, we're there, now add the constructor. 7080 // C++0x [class.inhctor]p8: [...] that would be performed by a 7081 // user-written inline constructor [...] 7082 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7083 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7084 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7085 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7086 /*ImplicitlyDeclared=*/true, 7087 // FIXME: Due to a defect in the standard, we treat inherited 7088 // constructors as constexpr even if that makes them ill-formed. 7089 /*Constexpr=*/BaseCtor->isConstexpr()); 7090 NewCtor->setAccess(BaseCtor->getAccess()); 7091 7092 // Build up the parameter decls and add them. 7093 SmallVector<ParmVarDecl *, 16> ParamDecls; 7094 for (unsigned i = 0; i < params; ++i) { 7095 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7096 UsingLoc, UsingLoc, 7097 /*IdentifierInfo=*/0, 7098 BaseCtorType->getArgType(i), 7099 /*TInfo=*/0, SC_None, 7100 SC_None, /*DefaultArg=*/0)); 7101 } 7102 NewCtor->setParams(ParamDecls); 7103 NewCtor->setInheritedConstructor(BaseCtor); 7104 7105 PushOnScopeChains(NewCtor, S, false); 7106 ClassDecl->addDecl(NewCtor); 7107 result.first->second.second = NewCtor; 7108 } 7109 } 7110 } 7111} 7112 7113Sema::ImplicitExceptionSpecification 7114Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7115 // C++ [except.spec]p14: 7116 // An implicitly declared special member function (Clause 12) shall have 7117 // an exception-specification. 7118 ImplicitExceptionSpecification ExceptSpec(Context); 7119 if (ClassDecl->isInvalidDecl()) 7120 return ExceptSpec; 7121 7122 // Direct base-class destructors. 7123 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7124 BEnd = ClassDecl->bases_end(); 7125 B != BEnd; ++B) { 7126 if (B->isVirtual()) // Handled below. 7127 continue; 7128 7129 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7130 ExceptSpec.CalledDecl( 7131 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7132 } 7133 7134 // Virtual base-class destructors. 7135 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7136 BEnd = ClassDecl->vbases_end(); 7137 B != BEnd; ++B) { 7138 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7139 ExceptSpec.CalledDecl( 7140 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7141 } 7142 7143 // Field destructors. 7144 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7145 FEnd = ClassDecl->field_end(); 7146 F != FEnd; ++F) { 7147 if (const RecordType *RecordTy 7148 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7149 ExceptSpec.CalledDecl( 7150 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7151 } 7152 7153 return ExceptSpec; 7154} 7155 7156CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7157 // C++ [class.dtor]p2: 7158 // If a class has no user-declared destructor, a destructor is 7159 // declared implicitly. An implicitly-declared destructor is an 7160 // inline public member of its class. 7161 7162 ImplicitExceptionSpecification Spec = 7163 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7164 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7165 7166 // Create the actual destructor declaration. 7167 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7168 7169 CanQualType ClassType 7170 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7171 SourceLocation ClassLoc = ClassDecl->getLocation(); 7172 DeclarationName Name 7173 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7174 DeclarationNameInfo NameInfo(Name, ClassLoc); 7175 CXXDestructorDecl *Destructor 7176 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7177 /*isInline=*/true, 7178 /*isImplicitlyDeclared=*/true); 7179 Destructor->setAccess(AS_public); 7180 Destructor->setDefaulted(); 7181 Destructor->setImplicit(); 7182 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7183 7184 // Note that we have declared this destructor. 7185 ++ASTContext::NumImplicitDestructorsDeclared; 7186 7187 // Introduce this destructor into its scope. 7188 if (Scope *S = getScopeForContext(ClassDecl)) 7189 PushOnScopeChains(Destructor, S, false); 7190 ClassDecl->addDecl(Destructor); 7191 7192 // This could be uniqued if it ever proves significant. 7193 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7194 7195 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7196 Destructor->setDeletedAsWritten(); 7197 7198 AddOverriddenMethods(ClassDecl, Destructor); 7199 7200 return Destructor; 7201} 7202 7203void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7204 CXXDestructorDecl *Destructor) { 7205 assert((Destructor->isDefaulted() && 7206 !Destructor->doesThisDeclarationHaveABody()) && 7207 "DefineImplicitDestructor - call it for implicit default dtor"); 7208 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7209 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7210 7211 if (Destructor->isInvalidDecl()) 7212 return; 7213 7214 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7215 7216 DiagnosticErrorTrap Trap(Diags); 7217 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7218 Destructor->getParent()); 7219 7220 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7221 Diag(CurrentLocation, diag::note_member_synthesized_at) 7222 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7223 7224 Destructor->setInvalidDecl(); 7225 return; 7226 } 7227 7228 SourceLocation Loc = Destructor->getLocation(); 7229 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7230 Destructor->setImplicitlyDefined(true); 7231 Destructor->setUsed(); 7232 MarkVTableUsed(CurrentLocation, ClassDecl); 7233 7234 if (ASTMutationListener *L = getASTMutationListener()) { 7235 L->CompletedImplicitDefinition(Destructor); 7236 } 7237} 7238 7239void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7240 CXXDestructorDecl *destructor) { 7241 // C++11 [class.dtor]p3: 7242 // A declaration of a destructor that does not have an exception- 7243 // specification is implicitly considered to have the same exception- 7244 // specification as an implicit declaration. 7245 const FunctionProtoType *dtorType = destructor->getType()-> 7246 getAs<FunctionProtoType>(); 7247 if (dtorType->hasExceptionSpec()) 7248 return; 7249 7250 ImplicitExceptionSpecification exceptSpec = 7251 ComputeDefaultedDtorExceptionSpec(classDecl); 7252 7253 // Replace the destructor's type, building off the existing one. Fortunately, 7254 // the only thing of interest in the destructor type is its extended info. 7255 // The return and arguments are fixed. 7256 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7257 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7258 epi.NumExceptions = exceptSpec.size(); 7259 epi.Exceptions = exceptSpec.data(); 7260 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7261 7262 destructor->setType(ty); 7263 7264 // FIXME: If the destructor has a body that could throw, and the newly created 7265 // spec doesn't allow exceptions, we should emit a warning, because this 7266 // change in behavior can break conforming C++03 programs at runtime. 7267 // However, we don't have a body yet, so it needs to be done somewhere else. 7268} 7269 7270/// \brief Builds a statement that copies/moves the given entity from \p From to 7271/// \c To. 7272/// 7273/// This routine is used to copy/move the members of a class with an 7274/// implicitly-declared copy/move assignment operator. When the entities being 7275/// copied are arrays, this routine builds for loops to copy them. 7276/// 7277/// \param S The Sema object used for type-checking. 7278/// 7279/// \param Loc The location where the implicit copy/move is being generated. 7280/// 7281/// \param T The type of the expressions being copied/moved. Both expressions 7282/// must have this type. 7283/// 7284/// \param To The expression we are copying/moving to. 7285/// 7286/// \param From The expression we are copying/moving from. 7287/// 7288/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7289/// Otherwise, it's a non-static member subobject. 7290/// 7291/// \param Copying Whether we're copying or moving. 7292/// 7293/// \param Depth Internal parameter recording the depth of the recursion. 7294/// 7295/// \returns A statement or a loop that copies the expressions. 7296static StmtResult 7297BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7298 Expr *To, Expr *From, 7299 bool CopyingBaseSubobject, bool Copying, 7300 unsigned Depth = 0) { 7301 // C++0x [class.copy]p28: 7302 // Each subobject is assigned in the manner appropriate to its type: 7303 // 7304 // - if the subobject is of class type, as if by a call to operator= with 7305 // the subobject as the object expression and the corresponding 7306 // subobject of x as a single function argument (as if by explicit 7307 // qualification; that is, ignoring any possible virtual overriding 7308 // functions in more derived classes); 7309 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7310 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7311 7312 // Look for operator=. 7313 DeclarationName Name 7314 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7315 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7316 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7317 7318 // Filter out any result that isn't a copy/move-assignment operator. 7319 LookupResult::Filter F = OpLookup.makeFilter(); 7320 while (F.hasNext()) { 7321 NamedDecl *D = F.next(); 7322 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7323 if (Copying ? Method->isCopyAssignmentOperator() : 7324 Method->isMoveAssignmentOperator()) 7325 continue; 7326 7327 F.erase(); 7328 } 7329 F.done(); 7330 7331 // Suppress the protected check (C++ [class.protected]) for each of the 7332 // assignment operators we found. This strange dance is required when 7333 // we're assigning via a base classes's copy-assignment operator. To 7334 // ensure that we're getting the right base class subobject (without 7335 // ambiguities), we need to cast "this" to that subobject type; to 7336 // ensure that we don't go through the virtual call mechanism, we need 7337 // to qualify the operator= name with the base class (see below). However, 7338 // this means that if the base class has a protected copy assignment 7339 // operator, the protected member access check will fail. So, we 7340 // rewrite "protected" access to "public" access in this case, since we 7341 // know by construction that we're calling from a derived class. 7342 if (CopyingBaseSubobject) { 7343 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7344 L != LEnd; ++L) { 7345 if (L.getAccess() == AS_protected) 7346 L.setAccess(AS_public); 7347 } 7348 } 7349 7350 // Create the nested-name-specifier that will be used to qualify the 7351 // reference to operator=; this is required to suppress the virtual 7352 // call mechanism. 7353 CXXScopeSpec SS; 7354 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7355 SS.MakeTrivial(S.Context, 7356 NestedNameSpecifier::Create(S.Context, 0, false, 7357 CanonicalT), 7358 Loc); 7359 7360 // Create the reference to operator=. 7361 ExprResult OpEqualRef 7362 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7363 /*TemplateKWLoc=*/SourceLocation(), 7364 /*FirstQualifierInScope=*/0, 7365 OpLookup, 7366 /*TemplateArgs=*/0, 7367 /*SuppressQualifierCheck=*/true); 7368 if (OpEqualRef.isInvalid()) 7369 return StmtError(); 7370 7371 // Build the call to the assignment operator. 7372 7373 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7374 OpEqualRef.takeAs<Expr>(), 7375 Loc, &From, 1, Loc); 7376 if (Call.isInvalid()) 7377 return StmtError(); 7378 7379 return S.Owned(Call.takeAs<Stmt>()); 7380 } 7381 7382 // - if the subobject is of scalar type, the built-in assignment 7383 // operator is used. 7384 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7385 if (!ArrayTy) { 7386 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7387 if (Assignment.isInvalid()) 7388 return StmtError(); 7389 7390 return S.Owned(Assignment.takeAs<Stmt>()); 7391 } 7392 7393 // - if the subobject is an array, each element is assigned, in the 7394 // manner appropriate to the element type; 7395 7396 // Construct a loop over the array bounds, e.g., 7397 // 7398 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7399 // 7400 // that will copy each of the array elements. 7401 QualType SizeType = S.Context.getSizeType(); 7402 7403 // Create the iteration variable. 7404 IdentifierInfo *IterationVarName = 0; 7405 { 7406 SmallString<8> Str; 7407 llvm::raw_svector_ostream OS(Str); 7408 OS << "__i" << Depth; 7409 IterationVarName = &S.Context.Idents.get(OS.str()); 7410 } 7411 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7412 IterationVarName, SizeType, 7413 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7414 SC_None, SC_None); 7415 7416 // Initialize the iteration variable to zero. 7417 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7418 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7419 7420 // Create a reference to the iteration variable; we'll use this several 7421 // times throughout. 7422 Expr *IterationVarRef 7423 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7424 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7425 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7426 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7427 7428 // Create the DeclStmt that holds the iteration variable. 7429 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7430 7431 // Create the comparison against the array bound. 7432 llvm::APInt Upper 7433 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7434 Expr *Comparison 7435 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7436 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7437 BO_NE, S.Context.BoolTy, 7438 VK_RValue, OK_Ordinary, Loc); 7439 7440 // Create the pre-increment of the iteration variable. 7441 Expr *Increment 7442 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7443 VK_LValue, OK_Ordinary, Loc); 7444 7445 // Subscript the "from" and "to" expressions with the iteration variable. 7446 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7447 IterationVarRefRVal, 7448 Loc)); 7449 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7450 IterationVarRefRVal, 7451 Loc)); 7452 if (!Copying) // Cast to rvalue 7453 From = CastForMoving(S, From); 7454 7455 // Build the copy/move for an individual element of the array. 7456 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7457 To, From, CopyingBaseSubobject, 7458 Copying, Depth + 1); 7459 if (Copy.isInvalid()) 7460 return StmtError(); 7461 7462 // Construct the loop that copies all elements of this array. 7463 return S.ActOnForStmt(Loc, Loc, InitStmt, 7464 S.MakeFullExpr(Comparison), 7465 0, S.MakeFullExpr(Increment), 7466 Loc, Copy.take()); 7467} 7468 7469std::pair<Sema::ImplicitExceptionSpecification, bool> 7470Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7471 CXXRecordDecl *ClassDecl) { 7472 if (ClassDecl->isInvalidDecl()) 7473 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7474 7475 // C++ [class.copy]p10: 7476 // If the class definition does not explicitly declare a copy 7477 // assignment operator, one is declared implicitly. 7478 // The implicitly-defined copy assignment operator for a class X 7479 // will have the form 7480 // 7481 // X& X::operator=(const X&) 7482 // 7483 // if 7484 bool HasConstCopyAssignment = true; 7485 7486 // -- each direct base class B of X has a copy assignment operator 7487 // whose parameter is of type const B&, const volatile B& or B, 7488 // and 7489 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7490 BaseEnd = ClassDecl->bases_end(); 7491 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7492 // We'll handle this below 7493 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7494 continue; 7495 7496 assert(!Base->getType()->isDependentType() && 7497 "Cannot generate implicit members for class with dependent bases."); 7498 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7499 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7500 &HasConstCopyAssignment); 7501 } 7502 7503 // In C++11, the above citation has "or virtual" added 7504 if (LangOpts.CPlusPlus0x) { 7505 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7506 BaseEnd = ClassDecl->vbases_end(); 7507 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7508 assert(!Base->getType()->isDependentType() && 7509 "Cannot generate implicit members for class with dependent bases."); 7510 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7511 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7512 &HasConstCopyAssignment); 7513 } 7514 } 7515 7516 // -- for all the nonstatic data members of X that are of a class 7517 // type M (or array thereof), each such class type has a copy 7518 // assignment operator whose parameter is of type const M&, 7519 // const volatile M& or M. 7520 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7521 FieldEnd = ClassDecl->field_end(); 7522 HasConstCopyAssignment && Field != FieldEnd; 7523 ++Field) { 7524 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7525 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7526 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7527 &HasConstCopyAssignment); 7528 } 7529 } 7530 7531 // Otherwise, the implicitly declared copy assignment operator will 7532 // have the form 7533 // 7534 // X& X::operator=(X&) 7535 7536 // C++ [except.spec]p14: 7537 // An implicitly declared special member function (Clause 12) shall have an 7538 // exception-specification. [...] 7539 7540 // It is unspecified whether or not an implicit copy assignment operator 7541 // attempts to deduplicate calls to assignment operators of virtual bases are 7542 // made. As such, this exception specification is effectively unspecified. 7543 // Based on a similar decision made for constness in C++0x, we're erring on 7544 // the side of assuming such calls to be made regardless of whether they 7545 // actually happen. 7546 ImplicitExceptionSpecification ExceptSpec(Context); 7547 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7548 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7549 BaseEnd = ClassDecl->bases_end(); 7550 Base != BaseEnd; ++Base) { 7551 if (Base->isVirtual()) 7552 continue; 7553 7554 CXXRecordDecl *BaseClassDecl 7555 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7556 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7557 ArgQuals, false, 0)) 7558 ExceptSpec.CalledDecl(CopyAssign); 7559 } 7560 7561 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7562 BaseEnd = ClassDecl->vbases_end(); 7563 Base != BaseEnd; ++Base) { 7564 CXXRecordDecl *BaseClassDecl 7565 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7566 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7567 ArgQuals, false, 0)) 7568 ExceptSpec.CalledDecl(CopyAssign); 7569 } 7570 7571 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7572 FieldEnd = ClassDecl->field_end(); 7573 Field != FieldEnd; 7574 ++Field) { 7575 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7576 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7577 if (CXXMethodDecl *CopyAssign = 7578 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7579 ExceptSpec.CalledDecl(CopyAssign); 7580 } 7581 } 7582 7583 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7584} 7585 7586CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7587 // Note: The following rules are largely analoguous to the copy 7588 // constructor rules. Note that virtual bases are not taken into account 7589 // for determining the argument type of the operator. Note also that 7590 // operators taking an object instead of a reference are allowed. 7591 7592 ImplicitExceptionSpecification Spec(Context); 7593 bool Const; 7594 llvm::tie(Spec, Const) = 7595 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7596 7597 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7598 QualType RetType = Context.getLValueReferenceType(ArgType); 7599 if (Const) 7600 ArgType = ArgType.withConst(); 7601 ArgType = Context.getLValueReferenceType(ArgType); 7602 7603 // An implicitly-declared copy assignment operator is an inline public 7604 // member of its class. 7605 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7606 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7607 SourceLocation ClassLoc = ClassDecl->getLocation(); 7608 DeclarationNameInfo NameInfo(Name, ClassLoc); 7609 CXXMethodDecl *CopyAssignment 7610 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7611 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7612 /*TInfo=*/0, /*isStatic=*/false, 7613 /*StorageClassAsWritten=*/SC_None, 7614 /*isInline=*/true, /*isConstexpr=*/false, 7615 SourceLocation()); 7616 CopyAssignment->setAccess(AS_public); 7617 CopyAssignment->setDefaulted(); 7618 CopyAssignment->setImplicit(); 7619 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7620 7621 // Add the parameter to the operator. 7622 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7623 ClassLoc, ClassLoc, /*Id=*/0, 7624 ArgType, /*TInfo=*/0, 7625 SC_None, 7626 SC_None, 0); 7627 CopyAssignment->setParams(FromParam); 7628 7629 // Note that we have added this copy-assignment operator. 7630 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7631 7632 if (Scope *S = getScopeForContext(ClassDecl)) 7633 PushOnScopeChains(CopyAssignment, S, false); 7634 ClassDecl->addDecl(CopyAssignment); 7635 7636 // C++0x [class.copy]p19: 7637 // .... If the class definition does not explicitly declare a copy 7638 // assignment operator, there is no user-declared move constructor, and 7639 // there is no user-declared move assignment operator, a copy assignment 7640 // operator is implicitly declared as defaulted. 7641 if ((ClassDecl->hasUserDeclaredMoveConstructor() && 7642 !getLangOptions().MicrosoftMode) || 7643 ClassDecl->hasUserDeclaredMoveAssignment() || 7644 ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7645 CopyAssignment->setDeletedAsWritten(); 7646 7647 AddOverriddenMethods(ClassDecl, CopyAssignment); 7648 return CopyAssignment; 7649} 7650 7651void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7652 CXXMethodDecl *CopyAssignOperator) { 7653 assert((CopyAssignOperator->isDefaulted() && 7654 CopyAssignOperator->isOverloadedOperator() && 7655 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7656 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7657 "DefineImplicitCopyAssignment called for wrong function"); 7658 7659 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7660 7661 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7662 CopyAssignOperator->setInvalidDecl(); 7663 return; 7664 } 7665 7666 CopyAssignOperator->setUsed(); 7667 7668 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7669 DiagnosticErrorTrap Trap(Diags); 7670 7671 // C++0x [class.copy]p30: 7672 // The implicitly-defined or explicitly-defaulted copy assignment operator 7673 // for a non-union class X performs memberwise copy assignment of its 7674 // subobjects. The direct base classes of X are assigned first, in the 7675 // order of their declaration in the base-specifier-list, and then the 7676 // immediate non-static data members of X are assigned, in the order in 7677 // which they were declared in the class definition. 7678 7679 // The statements that form the synthesized function body. 7680 ASTOwningVector<Stmt*> Statements(*this); 7681 7682 // The parameter for the "other" object, which we are copying from. 7683 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7684 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7685 QualType OtherRefType = Other->getType(); 7686 if (const LValueReferenceType *OtherRef 7687 = OtherRefType->getAs<LValueReferenceType>()) { 7688 OtherRefType = OtherRef->getPointeeType(); 7689 OtherQuals = OtherRefType.getQualifiers(); 7690 } 7691 7692 // Our location for everything implicitly-generated. 7693 SourceLocation Loc = CopyAssignOperator->getLocation(); 7694 7695 // Construct a reference to the "other" object. We'll be using this 7696 // throughout the generated ASTs. 7697 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7698 assert(OtherRef && "Reference to parameter cannot fail!"); 7699 7700 // Construct the "this" pointer. We'll be using this throughout the generated 7701 // ASTs. 7702 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7703 assert(This && "Reference to this cannot fail!"); 7704 7705 // Assign base classes. 7706 bool Invalid = false; 7707 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7708 E = ClassDecl->bases_end(); Base != E; ++Base) { 7709 // Form the assignment: 7710 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7711 QualType BaseType = Base->getType().getUnqualifiedType(); 7712 if (!BaseType->isRecordType()) { 7713 Invalid = true; 7714 continue; 7715 } 7716 7717 CXXCastPath BasePath; 7718 BasePath.push_back(Base); 7719 7720 // Construct the "from" expression, which is an implicit cast to the 7721 // appropriately-qualified base type. 7722 Expr *From = OtherRef; 7723 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7724 CK_UncheckedDerivedToBase, 7725 VK_LValue, &BasePath).take(); 7726 7727 // Dereference "this". 7728 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7729 7730 // Implicitly cast "this" to the appropriately-qualified base type. 7731 To = ImpCastExprToType(To.take(), 7732 Context.getCVRQualifiedType(BaseType, 7733 CopyAssignOperator->getTypeQualifiers()), 7734 CK_UncheckedDerivedToBase, 7735 VK_LValue, &BasePath); 7736 7737 // Build the copy. 7738 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7739 To.get(), From, 7740 /*CopyingBaseSubobject=*/true, 7741 /*Copying=*/true); 7742 if (Copy.isInvalid()) { 7743 Diag(CurrentLocation, diag::note_member_synthesized_at) 7744 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7745 CopyAssignOperator->setInvalidDecl(); 7746 return; 7747 } 7748 7749 // Success! Record the copy. 7750 Statements.push_back(Copy.takeAs<Expr>()); 7751 } 7752 7753 // \brief Reference to the __builtin_memcpy function. 7754 Expr *BuiltinMemCpyRef = 0; 7755 // \brief Reference to the __builtin_objc_memmove_collectable function. 7756 Expr *CollectableMemCpyRef = 0; 7757 7758 // Assign non-static members. 7759 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7760 FieldEnd = ClassDecl->field_end(); 7761 Field != FieldEnd; ++Field) { 7762 if (Field->isUnnamedBitfield()) 7763 continue; 7764 7765 // Check for members of reference type; we can't copy those. 7766 if (Field->getType()->isReferenceType()) { 7767 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7768 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7769 Diag(Field->getLocation(), diag::note_declared_at); 7770 Diag(CurrentLocation, diag::note_member_synthesized_at) 7771 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7772 Invalid = true; 7773 continue; 7774 } 7775 7776 // Check for members of const-qualified, non-class type. 7777 QualType BaseType = Context.getBaseElementType(Field->getType()); 7778 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7779 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7780 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7781 Diag(Field->getLocation(), diag::note_declared_at); 7782 Diag(CurrentLocation, diag::note_member_synthesized_at) 7783 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7784 Invalid = true; 7785 continue; 7786 } 7787 7788 // Suppress assigning zero-width bitfields. 7789 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7790 continue; 7791 7792 QualType FieldType = Field->getType().getNonReferenceType(); 7793 if (FieldType->isIncompleteArrayType()) { 7794 assert(ClassDecl->hasFlexibleArrayMember() && 7795 "Incomplete array type is not valid"); 7796 continue; 7797 } 7798 7799 // Build references to the field in the object we're copying from and to. 7800 CXXScopeSpec SS; // Intentionally empty 7801 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7802 LookupMemberName); 7803 MemberLookup.addDecl(*Field); 7804 MemberLookup.resolveKind(); 7805 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7806 Loc, /*IsArrow=*/false, 7807 SS, SourceLocation(), 0, 7808 MemberLookup, 0); 7809 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7810 Loc, /*IsArrow=*/true, 7811 SS, SourceLocation(), 0, 7812 MemberLookup, 0); 7813 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7814 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7815 7816 // If the field should be copied with __builtin_memcpy rather than via 7817 // explicit assignments, do so. This optimization only applies for arrays 7818 // of scalars and arrays of class type with trivial copy-assignment 7819 // operators. 7820 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7821 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7822 // Compute the size of the memory buffer to be copied. 7823 QualType SizeType = Context.getSizeType(); 7824 llvm::APInt Size(Context.getTypeSize(SizeType), 7825 Context.getTypeSizeInChars(BaseType).getQuantity()); 7826 for (const ConstantArrayType *Array 7827 = Context.getAsConstantArrayType(FieldType); 7828 Array; 7829 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7830 llvm::APInt ArraySize 7831 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7832 Size *= ArraySize; 7833 } 7834 7835 // Take the address of the field references for "from" and "to". 7836 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7837 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7838 7839 bool NeedsCollectableMemCpy = 7840 (BaseType->isRecordType() && 7841 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7842 7843 if (NeedsCollectableMemCpy) { 7844 if (!CollectableMemCpyRef) { 7845 // Create a reference to the __builtin_objc_memmove_collectable function. 7846 LookupResult R(*this, 7847 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7848 Loc, LookupOrdinaryName); 7849 LookupName(R, TUScope, true); 7850 7851 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7852 if (!CollectableMemCpy) { 7853 // Something went horribly wrong earlier, and we will have 7854 // complained about it. 7855 Invalid = true; 7856 continue; 7857 } 7858 7859 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7860 CollectableMemCpy->getType(), 7861 VK_LValue, Loc, 0).take(); 7862 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7863 } 7864 } 7865 // Create a reference to the __builtin_memcpy builtin function. 7866 else if (!BuiltinMemCpyRef) { 7867 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7868 LookupOrdinaryName); 7869 LookupName(R, TUScope, true); 7870 7871 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7872 if (!BuiltinMemCpy) { 7873 // Something went horribly wrong earlier, and we will have complained 7874 // about it. 7875 Invalid = true; 7876 continue; 7877 } 7878 7879 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7880 BuiltinMemCpy->getType(), 7881 VK_LValue, Loc, 0).take(); 7882 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7883 } 7884 7885 ASTOwningVector<Expr*> CallArgs(*this); 7886 CallArgs.push_back(To.takeAs<Expr>()); 7887 CallArgs.push_back(From.takeAs<Expr>()); 7888 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7889 ExprResult Call = ExprError(); 7890 if (NeedsCollectableMemCpy) 7891 Call = ActOnCallExpr(/*Scope=*/0, 7892 CollectableMemCpyRef, 7893 Loc, move_arg(CallArgs), 7894 Loc); 7895 else 7896 Call = ActOnCallExpr(/*Scope=*/0, 7897 BuiltinMemCpyRef, 7898 Loc, move_arg(CallArgs), 7899 Loc); 7900 7901 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7902 Statements.push_back(Call.takeAs<Expr>()); 7903 continue; 7904 } 7905 7906 // Build the copy of this field. 7907 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7908 To.get(), From.get(), 7909 /*CopyingBaseSubobject=*/false, 7910 /*Copying=*/true); 7911 if (Copy.isInvalid()) { 7912 Diag(CurrentLocation, diag::note_member_synthesized_at) 7913 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7914 CopyAssignOperator->setInvalidDecl(); 7915 return; 7916 } 7917 7918 // Success! Record the copy. 7919 Statements.push_back(Copy.takeAs<Stmt>()); 7920 } 7921 7922 if (!Invalid) { 7923 // Add a "return *this;" 7924 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7925 7926 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7927 if (Return.isInvalid()) 7928 Invalid = true; 7929 else { 7930 Statements.push_back(Return.takeAs<Stmt>()); 7931 7932 if (Trap.hasErrorOccurred()) { 7933 Diag(CurrentLocation, diag::note_member_synthesized_at) 7934 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7935 Invalid = true; 7936 } 7937 } 7938 } 7939 7940 if (Invalid) { 7941 CopyAssignOperator->setInvalidDecl(); 7942 return; 7943 } 7944 7945 StmtResult Body; 7946 { 7947 CompoundScopeRAII CompoundScope(*this); 7948 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7949 /*isStmtExpr=*/false); 7950 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7951 } 7952 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7953 7954 if (ASTMutationListener *L = getASTMutationListener()) { 7955 L->CompletedImplicitDefinition(CopyAssignOperator); 7956 } 7957} 7958 7959Sema::ImplicitExceptionSpecification 7960Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7961 ImplicitExceptionSpecification ExceptSpec(Context); 7962 7963 if (ClassDecl->isInvalidDecl()) 7964 return ExceptSpec; 7965 7966 // C++0x [except.spec]p14: 7967 // An implicitly declared special member function (Clause 12) shall have an 7968 // exception-specification. [...] 7969 7970 // It is unspecified whether or not an implicit move assignment operator 7971 // attempts to deduplicate calls to assignment operators of virtual bases are 7972 // made. As such, this exception specification is effectively unspecified. 7973 // Based on a similar decision made for constness in C++0x, we're erring on 7974 // the side of assuming such calls to be made regardless of whether they 7975 // actually happen. 7976 // Note that a move constructor is not implicitly declared when there are 7977 // virtual bases, but it can still be user-declared and explicitly defaulted. 7978 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7979 BaseEnd = ClassDecl->bases_end(); 7980 Base != BaseEnd; ++Base) { 7981 if (Base->isVirtual()) 7982 continue; 7983 7984 CXXRecordDecl *BaseClassDecl 7985 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7986 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7987 false, 0)) 7988 ExceptSpec.CalledDecl(MoveAssign); 7989 } 7990 7991 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7992 BaseEnd = ClassDecl->vbases_end(); 7993 Base != BaseEnd; ++Base) { 7994 CXXRecordDecl *BaseClassDecl 7995 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7996 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7997 false, 0)) 7998 ExceptSpec.CalledDecl(MoveAssign); 7999 } 8000 8001 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8002 FieldEnd = ClassDecl->field_end(); 8003 Field != FieldEnd; 8004 ++Field) { 8005 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8006 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8007 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8008 false, 0)) 8009 ExceptSpec.CalledDecl(MoveAssign); 8010 } 8011 } 8012 8013 return ExceptSpec; 8014} 8015 8016CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8017 // Note: The following rules are largely analoguous to the move 8018 // constructor rules. 8019 8020 ImplicitExceptionSpecification Spec( 8021 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8022 8023 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8024 QualType RetType = Context.getLValueReferenceType(ArgType); 8025 ArgType = Context.getRValueReferenceType(ArgType); 8026 8027 // An implicitly-declared move assignment operator is an inline public 8028 // member of its class. 8029 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8030 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8031 SourceLocation ClassLoc = ClassDecl->getLocation(); 8032 DeclarationNameInfo NameInfo(Name, ClassLoc); 8033 CXXMethodDecl *MoveAssignment 8034 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8035 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8036 /*TInfo=*/0, /*isStatic=*/false, 8037 /*StorageClassAsWritten=*/SC_None, 8038 /*isInline=*/true, 8039 /*isConstexpr=*/false, 8040 SourceLocation()); 8041 MoveAssignment->setAccess(AS_public); 8042 MoveAssignment->setDefaulted(); 8043 MoveAssignment->setImplicit(); 8044 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8045 8046 // Add the parameter to the operator. 8047 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8048 ClassLoc, ClassLoc, /*Id=*/0, 8049 ArgType, /*TInfo=*/0, 8050 SC_None, 8051 SC_None, 0); 8052 MoveAssignment->setParams(FromParam); 8053 8054 // Note that we have added this copy-assignment operator. 8055 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8056 8057 // C++0x [class.copy]p9: 8058 // If the definition of a class X does not explicitly declare a move 8059 // assignment operator, one will be implicitly declared as defaulted if and 8060 // only if: 8061 // [...] 8062 // - the move assignment operator would not be implicitly defined as 8063 // deleted. 8064 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8065 // Cache this result so that we don't try to generate this over and over 8066 // on every lookup, leaking memory and wasting time. 8067 ClassDecl->setFailedImplicitMoveAssignment(); 8068 return 0; 8069 } 8070 8071 if (Scope *S = getScopeForContext(ClassDecl)) 8072 PushOnScopeChains(MoveAssignment, S, false); 8073 ClassDecl->addDecl(MoveAssignment); 8074 8075 AddOverriddenMethods(ClassDecl, MoveAssignment); 8076 return MoveAssignment; 8077} 8078 8079void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8080 CXXMethodDecl *MoveAssignOperator) { 8081 assert((MoveAssignOperator->isDefaulted() && 8082 MoveAssignOperator->isOverloadedOperator() && 8083 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8084 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8085 "DefineImplicitMoveAssignment called for wrong function"); 8086 8087 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8088 8089 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8090 MoveAssignOperator->setInvalidDecl(); 8091 return; 8092 } 8093 8094 MoveAssignOperator->setUsed(); 8095 8096 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8097 DiagnosticErrorTrap Trap(Diags); 8098 8099 // C++0x [class.copy]p28: 8100 // The implicitly-defined or move assignment operator for a non-union class 8101 // X performs memberwise move assignment of its subobjects. The direct base 8102 // classes of X are assigned first, in the order of their declaration in the 8103 // base-specifier-list, and then the immediate non-static data members of X 8104 // are assigned, in the order in which they were declared in the class 8105 // definition. 8106 8107 // The statements that form the synthesized function body. 8108 ASTOwningVector<Stmt*> Statements(*this); 8109 8110 // The parameter for the "other" object, which we are move from. 8111 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8112 QualType OtherRefType = Other->getType()-> 8113 getAs<RValueReferenceType>()->getPointeeType(); 8114 assert(OtherRefType.getQualifiers() == 0 && 8115 "Bad argument type of defaulted move assignment"); 8116 8117 // Our location for everything implicitly-generated. 8118 SourceLocation Loc = MoveAssignOperator->getLocation(); 8119 8120 // Construct a reference to the "other" object. We'll be using this 8121 // throughout the generated ASTs. 8122 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8123 assert(OtherRef && "Reference to parameter cannot fail!"); 8124 // Cast to rvalue. 8125 OtherRef = CastForMoving(*this, OtherRef); 8126 8127 // Construct the "this" pointer. We'll be using this throughout the generated 8128 // ASTs. 8129 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8130 assert(This && "Reference to this cannot fail!"); 8131 8132 // Assign base classes. 8133 bool Invalid = false; 8134 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8135 E = ClassDecl->bases_end(); Base != E; ++Base) { 8136 // Form the assignment: 8137 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8138 QualType BaseType = Base->getType().getUnqualifiedType(); 8139 if (!BaseType->isRecordType()) { 8140 Invalid = true; 8141 continue; 8142 } 8143 8144 CXXCastPath BasePath; 8145 BasePath.push_back(Base); 8146 8147 // Construct the "from" expression, which is an implicit cast to the 8148 // appropriately-qualified base type. 8149 Expr *From = OtherRef; 8150 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8151 VK_XValue, &BasePath).take(); 8152 8153 // Dereference "this". 8154 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8155 8156 // Implicitly cast "this" to the appropriately-qualified base type. 8157 To = ImpCastExprToType(To.take(), 8158 Context.getCVRQualifiedType(BaseType, 8159 MoveAssignOperator->getTypeQualifiers()), 8160 CK_UncheckedDerivedToBase, 8161 VK_LValue, &BasePath); 8162 8163 // Build the move. 8164 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8165 To.get(), From, 8166 /*CopyingBaseSubobject=*/true, 8167 /*Copying=*/false); 8168 if (Move.isInvalid()) { 8169 Diag(CurrentLocation, diag::note_member_synthesized_at) 8170 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8171 MoveAssignOperator->setInvalidDecl(); 8172 return; 8173 } 8174 8175 // Success! Record the move. 8176 Statements.push_back(Move.takeAs<Expr>()); 8177 } 8178 8179 // \brief Reference to the __builtin_memcpy function. 8180 Expr *BuiltinMemCpyRef = 0; 8181 // \brief Reference to the __builtin_objc_memmove_collectable function. 8182 Expr *CollectableMemCpyRef = 0; 8183 8184 // Assign non-static members. 8185 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8186 FieldEnd = ClassDecl->field_end(); 8187 Field != FieldEnd; ++Field) { 8188 if (Field->isUnnamedBitfield()) 8189 continue; 8190 8191 // Check for members of reference type; we can't move those. 8192 if (Field->getType()->isReferenceType()) { 8193 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8194 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8195 Diag(Field->getLocation(), diag::note_declared_at); 8196 Diag(CurrentLocation, diag::note_member_synthesized_at) 8197 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8198 Invalid = true; 8199 continue; 8200 } 8201 8202 // Check for members of const-qualified, non-class type. 8203 QualType BaseType = Context.getBaseElementType(Field->getType()); 8204 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8205 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8206 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8207 Diag(Field->getLocation(), diag::note_declared_at); 8208 Diag(CurrentLocation, diag::note_member_synthesized_at) 8209 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8210 Invalid = true; 8211 continue; 8212 } 8213 8214 // Suppress assigning zero-width bitfields. 8215 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8216 continue; 8217 8218 QualType FieldType = Field->getType().getNonReferenceType(); 8219 if (FieldType->isIncompleteArrayType()) { 8220 assert(ClassDecl->hasFlexibleArrayMember() && 8221 "Incomplete array type is not valid"); 8222 continue; 8223 } 8224 8225 // Build references to the field in the object we're copying from and to. 8226 CXXScopeSpec SS; // Intentionally empty 8227 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8228 LookupMemberName); 8229 MemberLookup.addDecl(*Field); 8230 MemberLookup.resolveKind(); 8231 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8232 Loc, /*IsArrow=*/false, 8233 SS, SourceLocation(), 0, 8234 MemberLookup, 0); 8235 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8236 Loc, /*IsArrow=*/true, 8237 SS, SourceLocation(), 0, 8238 MemberLookup, 0); 8239 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8240 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8241 8242 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8243 "Member reference with rvalue base must be rvalue except for reference " 8244 "members, which aren't allowed for move assignment."); 8245 8246 // If the field should be copied with __builtin_memcpy rather than via 8247 // explicit assignments, do so. This optimization only applies for arrays 8248 // of scalars and arrays of class type with trivial move-assignment 8249 // operators. 8250 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8251 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8252 // Compute the size of the memory buffer to be copied. 8253 QualType SizeType = Context.getSizeType(); 8254 llvm::APInt Size(Context.getTypeSize(SizeType), 8255 Context.getTypeSizeInChars(BaseType).getQuantity()); 8256 for (const ConstantArrayType *Array 8257 = Context.getAsConstantArrayType(FieldType); 8258 Array; 8259 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8260 llvm::APInt ArraySize 8261 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8262 Size *= ArraySize; 8263 } 8264 8265 // Take the address of the field references for "from" and "to". We 8266 // directly construct UnaryOperators here because semantic analysis 8267 // does not permit us to take the address of an xvalue. 8268 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8269 Context.getPointerType(From.get()->getType()), 8270 VK_RValue, OK_Ordinary, Loc); 8271 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8272 Context.getPointerType(To.get()->getType()), 8273 VK_RValue, OK_Ordinary, Loc); 8274 8275 bool NeedsCollectableMemCpy = 8276 (BaseType->isRecordType() && 8277 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8278 8279 if (NeedsCollectableMemCpy) { 8280 if (!CollectableMemCpyRef) { 8281 // Create a reference to the __builtin_objc_memmove_collectable function. 8282 LookupResult R(*this, 8283 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8284 Loc, LookupOrdinaryName); 8285 LookupName(R, TUScope, true); 8286 8287 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8288 if (!CollectableMemCpy) { 8289 // Something went horribly wrong earlier, and we will have 8290 // complained about it. 8291 Invalid = true; 8292 continue; 8293 } 8294 8295 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8296 CollectableMemCpy->getType(), 8297 VK_LValue, Loc, 0).take(); 8298 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8299 } 8300 } 8301 // Create a reference to the __builtin_memcpy builtin function. 8302 else if (!BuiltinMemCpyRef) { 8303 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8304 LookupOrdinaryName); 8305 LookupName(R, TUScope, true); 8306 8307 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8308 if (!BuiltinMemCpy) { 8309 // Something went horribly wrong earlier, and we will have complained 8310 // about it. 8311 Invalid = true; 8312 continue; 8313 } 8314 8315 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8316 BuiltinMemCpy->getType(), 8317 VK_LValue, Loc, 0).take(); 8318 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8319 } 8320 8321 ASTOwningVector<Expr*> CallArgs(*this); 8322 CallArgs.push_back(To.takeAs<Expr>()); 8323 CallArgs.push_back(From.takeAs<Expr>()); 8324 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8325 ExprResult Call = ExprError(); 8326 if (NeedsCollectableMemCpy) 8327 Call = ActOnCallExpr(/*Scope=*/0, 8328 CollectableMemCpyRef, 8329 Loc, move_arg(CallArgs), 8330 Loc); 8331 else 8332 Call = ActOnCallExpr(/*Scope=*/0, 8333 BuiltinMemCpyRef, 8334 Loc, move_arg(CallArgs), 8335 Loc); 8336 8337 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8338 Statements.push_back(Call.takeAs<Expr>()); 8339 continue; 8340 } 8341 8342 // Build the move of this field. 8343 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8344 To.get(), From.get(), 8345 /*CopyingBaseSubobject=*/false, 8346 /*Copying=*/false); 8347 if (Move.isInvalid()) { 8348 Diag(CurrentLocation, diag::note_member_synthesized_at) 8349 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8350 MoveAssignOperator->setInvalidDecl(); 8351 return; 8352 } 8353 8354 // Success! Record the copy. 8355 Statements.push_back(Move.takeAs<Stmt>()); 8356 } 8357 8358 if (!Invalid) { 8359 // Add a "return *this;" 8360 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8361 8362 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8363 if (Return.isInvalid()) 8364 Invalid = true; 8365 else { 8366 Statements.push_back(Return.takeAs<Stmt>()); 8367 8368 if (Trap.hasErrorOccurred()) { 8369 Diag(CurrentLocation, diag::note_member_synthesized_at) 8370 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8371 Invalid = true; 8372 } 8373 } 8374 } 8375 8376 if (Invalid) { 8377 MoveAssignOperator->setInvalidDecl(); 8378 return; 8379 } 8380 8381 StmtResult Body; 8382 { 8383 CompoundScopeRAII CompoundScope(*this); 8384 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8385 /*isStmtExpr=*/false); 8386 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8387 } 8388 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8389 8390 if (ASTMutationListener *L = getASTMutationListener()) { 8391 L->CompletedImplicitDefinition(MoveAssignOperator); 8392 } 8393} 8394 8395std::pair<Sema::ImplicitExceptionSpecification, bool> 8396Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8397 if (ClassDecl->isInvalidDecl()) 8398 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8399 8400 // C++ [class.copy]p5: 8401 // The implicitly-declared copy constructor for a class X will 8402 // have the form 8403 // 8404 // X::X(const X&) 8405 // 8406 // if 8407 // FIXME: It ought to be possible to store this on the record. 8408 bool HasConstCopyConstructor = true; 8409 8410 // -- each direct or virtual base class B of X has a copy 8411 // constructor whose first parameter is of type const B& or 8412 // const volatile B&, and 8413 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8414 BaseEnd = ClassDecl->bases_end(); 8415 HasConstCopyConstructor && Base != BaseEnd; 8416 ++Base) { 8417 // Virtual bases are handled below. 8418 if (Base->isVirtual()) 8419 continue; 8420 8421 CXXRecordDecl *BaseClassDecl 8422 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8423 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8424 &HasConstCopyConstructor); 8425 } 8426 8427 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8428 BaseEnd = ClassDecl->vbases_end(); 8429 HasConstCopyConstructor && Base != BaseEnd; 8430 ++Base) { 8431 CXXRecordDecl *BaseClassDecl 8432 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8433 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8434 &HasConstCopyConstructor); 8435 } 8436 8437 // -- for all the nonstatic data members of X that are of a 8438 // class type M (or array thereof), each such class type 8439 // has a copy constructor whose first parameter is of type 8440 // const M& or const volatile M&. 8441 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8442 FieldEnd = ClassDecl->field_end(); 8443 HasConstCopyConstructor && Field != FieldEnd; 8444 ++Field) { 8445 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8446 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8447 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8448 &HasConstCopyConstructor); 8449 } 8450 } 8451 // Otherwise, the implicitly declared copy constructor will have 8452 // the form 8453 // 8454 // X::X(X&) 8455 8456 // C++ [except.spec]p14: 8457 // An implicitly declared special member function (Clause 12) shall have an 8458 // exception-specification. [...] 8459 ImplicitExceptionSpecification ExceptSpec(Context); 8460 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8461 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8462 BaseEnd = ClassDecl->bases_end(); 8463 Base != BaseEnd; 8464 ++Base) { 8465 // Virtual bases are handled below. 8466 if (Base->isVirtual()) 8467 continue; 8468 8469 CXXRecordDecl *BaseClassDecl 8470 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8471 if (CXXConstructorDecl *CopyConstructor = 8472 LookupCopyingConstructor(BaseClassDecl, Quals)) 8473 ExceptSpec.CalledDecl(CopyConstructor); 8474 } 8475 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8476 BaseEnd = ClassDecl->vbases_end(); 8477 Base != BaseEnd; 8478 ++Base) { 8479 CXXRecordDecl *BaseClassDecl 8480 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8481 if (CXXConstructorDecl *CopyConstructor = 8482 LookupCopyingConstructor(BaseClassDecl, Quals)) 8483 ExceptSpec.CalledDecl(CopyConstructor); 8484 } 8485 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8486 FieldEnd = ClassDecl->field_end(); 8487 Field != FieldEnd; 8488 ++Field) { 8489 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8490 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8491 if (CXXConstructorDecl *CopyConstructor = 8492 LookupCopyingConstructor(FieldClassDecl, Quals)) 8493 ExceptSpec.CalledDecl(CopyConstructor); 8494 } 8495 } 8496 8497 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8498} 8499 8500CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8501 CXXRecordDecl *ClassDecl) { 8502 // C++ [class.copy]p4: 8503 // If the class definition does not explicitly declare a copy 8504 // constructor, one is declared implicitly. 8505 8506 ImplicitExceptionSpecification Spec(Context); 8507 bool Const; 8508 llvm::tie(Spec, Const) = 8509 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8510 8511 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8512 QualType ArgType = ClassType; 8513 if (Const) 8514 ArgType = ArgType.withConst(); 8515 ArgType = Context.getLValueReferenceType(ArgType); 8516 8517 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8518 8519 DeclarationName Name 8520 = Context.DeclarationNames.getCXXConstructorName( 8521 Context.getCanonicalType(ClassType)); 8522 SourceLocation ClassLoc = ClassDecl->getLocation(); 8523 DeclarationNameInfo NameInfo(Name, ClassLoc); 8524 8525 // An implicitly-declared copy constructor is an inline public 8526 // member of its class. 8527 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8528 Context, ClassDecl, ClassLoc, NameInfo, 8529 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8530 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8531 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8532 getLangOptions().CPlusPlus0x); 8533 CopyConstructor->setAccess(AS_public); 8534 CopyConstructor->setDefaulted(); 8535 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8536 8537 // Note that we have declared this constructor. 8538 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8539 8540 // Add the parameter to the constructor. 8541 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8542 ClassLoc, ClassLoc, 8543 /*IdentifierInfo=*/0, 8544 ArgType, /*TInfo=*/0, 8545 SC_None, 8546 SC_None, 0); 8547 CopyConstructor->setParams(FromParam); 8548 8549 if (Scope *S = getScopeForContext(ClassDecl)) 8550 PushOnScopeChains(CopyConstructor, S, false); 8551 ClassDecl->addDecl(CopyConstructor); 8552 8553 // C++11 [class.copy]p8: 8554 // ... If the class definition does not explicitly declare a copy 8555 // constructor, there is no user-declared move constructor, and there is no 8556 // user-declared move assignment operator, a copy constructor is implicitly 8557 // declared as defaulted. 8558 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8559 (ClassDecl->hasUserDeclaredMoveAssignment() && 8560 !getLangOptions().MicrosoftMode) || 8561 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8562 CopyConstructor->setDeletedAsWritten(); 8563 8564 return CopyConstructor; 8565} 8566 8567void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8568 CXXConstructorDecl *CopyConstructor) { 8569 assert((CopyConstructor->isDefaulted() && 8570 CopyConstructor->isCopyConstructor() && 8571 !CopyConstructor->doesThisDeclarationHaveABody()) && 8572 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8573 8574 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8575 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8576 8577 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8578 DiagnosticErrorTrap Trap(Diags); 8579 8580 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8581 Trap.hasErrorOccurred()) { 8582 Diag(CurrentLocation, diag::note_member_synthesized_at) 8583 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8584 CopyConstructor->setInvalidDecl(); 8585 } else { 8586 Sema::CompoundScopeRAII CompoundScope(*this); 8587 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8588 CopyConstructor->getLocation(), 8589 MultiStmtArg(*this, 0, 0), 8590 /*isStmtExpr=*/false) 8591 .takeAs<Stmt>()); 8592 CopyConstructor->setImplicitlyDefined(true); 8593 } 8594 8595 CopyConstructor->setUsed(); 8596 if (ASTMutationListener *L = getASTMutationListener()) { 8597 L->CompletedImplicitDefinition(CopyConstructor); 8598 } 8599} 8600 8601Sema::ImplicitExceptionSpecification 8602Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8603 // C++ [except.spec]p14: 8604 // An implicitly declared special member function (Clause 12) shall have an 8605 // exception-specification. [...] 8606 ImplicitExceptionSpecification ExceptSpec(Context); 8607 if (ClassDecl->isInvalidDecl()) 8608 return ExceptSpec; 8609 8610 // Direct base-class constructors. 8611 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8612 BEnd = ClassDecl->bases_end(); 8613 B != BEnd; ++B) { 8614 if (B->isVirtual()) // Handled below. 8615 continue; 8616 8617 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8618 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8619 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8620 // If this is a deleted function, add it anyway. This might be conformant 8621 // with the standard. This might not. I'm not sure. It might not matter. 8622 if (Constructor) 8623 ExceptSpec.CalledDecl(Constructor); 8624 } 8625 } 8626 8627 // Virtual base-class constructors. 8628 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8629 BEnd = ClassDecl->vbases_end(); 8630 B != BEnd; ++B) { 8631 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8632 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8633 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8634 // If this is a deleted function, add it anyway. This might be conformant 8635 // with the standard. This might not. I'm not sure. It might not matter. 8636 if (Constructor) 8637 ExceptSpec.CalledDecl(Constructor); 8638 } 8639 } 8640 8641 // Field constructors. 8642 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8643 FEnd = ClassDecl->field_end(); 8644 F != FEnd; ++F) { 8645 if (const RecordType *RecordTy 8646 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8647 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8648 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8649 // If this is a deleted function, add it anyway. This might be conformant 8650 // with the standard. This might not. I'm not sure. It might not matter. 8651 // In particular, the problem is that this function never gets called. It 8652 // might just be ill-formed because this function attempts to refer to 8653 // a deleted function here. 8654 if (Constructor) 8655 ExceptSpec.CalledDecl(Constructor); 8656 } 8657 } 8658 8659 return ExceptSpec; 8660} 8661 8662CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8663 CXXRecordDecl *ClassDecl) { 8664 ImplicitExceptionSpecification Spec( 8665 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8666 8667 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8668 QualType ArgType = Context.getRValueReferenceType(ClassType); 8669 8670 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8671 8672 DeclarationName Name 8673 = Context.DeclarationNames.getCXXConstructorName( 8674 Context.getCanonicalType(ClassType)); 8675 SourceLocation ClassLoc = ClassDecl->getLocation(); 8676 DeclarationNameInfo NameInfo(Name, ClassLoc); 8677 8678 // C++0x [class.copy]p11: 8679 // An implicitly-declared copy/move constructor is an inline public 8680 // member of its class. 8681 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8682 Context, ClassDecl, ClassLoc, NameInfo, 8683 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8684 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8685 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8686 getLangOptions().CPlusPlus0x); 8687 MoveConstructor->setAccess(AS_public); 8688 MoveConstructor->setDefaulted(); 8689 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8690 8691 // Add the parameter to the constructor. 8692 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8693 ClassLoc, ClassLoc, 8694 /*IdentifierInfo=*/0, 8695 ArgType, /*TInfo=*/0, 8696 SC_None, 8697 SC_None, 0); 8698 MoveConstructor->setParams(FromParam); 8699 8700 // C++0x [class.copy]p9: 8701 // If the definition of a class X does not explicitly declare a move 8702 // constructor, one will be implicitly declared as defaulted if and only if: 8703 // [...] 8704 // - the move constructor would not be implicitly defined as deleted. 8705 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8706 // Cache this result so that we don't try to generate this over and over 8707 // on every lookup, leaking memory and wasting time. 8708 ClassDecl->setFailedImplicitMoveConstructor(); 8709 return 0; 8710 } 8711 8712 // Note that we have declared this constructor. 8713 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8714 8715 if (Scope *S = getScopeForContext(ClassDecl)) 8716 PushOnScopeChains(MoveConstructor, S, false); 8717 ClassDecl->addDecl(MoveConstructor); 8718 8719 return MoveConstructor; 8720} 8721 8722void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8723 CXXConstructorDecl *MoveConstructor) { 8724 assert((MoveConstructor->isDefaulted() && 8725 MoveConstructor->isMoveConstructor() && 8726 !MoveConstructor->doesThisDeclarationHaveABody()) && 8727 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8728 8729 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8730 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8731 8732 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8733 DiagnosticErrorTrap Trap(Diags); 8734 8735 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8736 Trap.hasErrorOccurred()) { 8737 Diag(CurrentLocation, diag::note_member_synthesized_at) 8738 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8739 MoveConstructor->setInvalidDecl(); 8740 } else { 8741 Sema::CompoundScopeRAII CompoundScope(*this); 8742 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8743 MoveConstructor->getLocation(), 8744 MultiStmtArg(*this, 0, 0), 8745 /*isStmtExpr=*/false) 8746 .takeAs<Stmt>()); 8747 MoveConstructor->setImplicitlyDefined(true); 8748 } 8749 8750 MoveConstructor->setUsed(); 8751 8752 if (ASTMutationListener *L = getASTMutationListener()) { 8753 L->CompletedImplicitDefinition(MoveConstructor); 8754 } 8755} 8756 8757bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8758 return FD->isDeleted() && 8759 (FD->isDefaulted() || FD->isImplicit()) && 8760 isa<CXXMethodDecl>(FD); 8761} 8762 8763/// \brief Mark the call operator of the given lambda closure type as "used". 8764static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8765 CXXMethodDecl *CallOperator 8766 = cast<CXXMethodDecl>( 8767 *Lambda->lookup( 8768 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8769 CallOperator->setReferenced(); 8770 CallOperator->setUsed(); 8771} 8772 8773void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8774 SourceLocation CurrentLocation, 8775 CXXConversionDecl *Conv) 8776{ 8777 CXXRecordDecl *Lambda = Conv->getParent(); 8778 8779 // Make sure that the lambda call operator is marked used. 8780 markLambdaCallOperatorUsed(*this, Lambda); 8781 8782 Conv->setUsed(); 8783 8784 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8785 DiagnosticErrorTrap Trap(Diags); 8786 8787 // Return the address of the __invoke function. 8788 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8789 CXXMethodDecl *Invoke 8790 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8791 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8792 VK_LValue, Conv->getLocation()).take(); 8793 assert(FunctionRef && "Can't refer to __invoke function?"); 8794 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8795 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8796 Conv->getLocation(), 8797 Conv->getLocation())); 8798 8799 // Fill in the __invoke function with a dummy implementation. IR generation 8800 // will fill in the actual details. 8801 Invoke->setUsed(); 8802 Invoke->setReferenced(); 8803 Invoke->setBody(new (Context) CompoundStmt(Context, 0, 0, Conv->getLocation(), 8804 Conv->getLocation())); 8805 8806 if (ASTMutationListener *L = getASTMutationListener()) { 8807 L->CompletedImplicitDefinition(Conv); 8808 L->CompletedImplicitDefinition(Invoke); 8809 } 8810} 8811 8812void Sema::DefineImplicitLambdaToBlockPointerConversion( 8813 SourceLocation CurrentLocation, 8814 CXXConversionDecl *Conv) 8815{ 8816 CXXRecordDecl *Lambda = Conv->getParent(); 8817 8818 // Make sure that the lambda call operator is marked used. 8819 CXXMethodDecl *CallOperator 8820 = cast<CXXMethodDecl>( 8821 *Lambda->lookup( 8822 Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8823 CallOperator->setReferenced(); 8824 CallOperator->setUsed(); 8825 Conv->setUsed(); 8826 8827 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8828 DiagnosticErrorTrap Trap(Diags); 8829 8830 // Copy-initialize the lambda object as needed to capture it. 8831 Expr *This = ActOnCXXThis(CurrentLocation).take(); 8832 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 8833 ExprResult Init = PerformCopyInitialization( 8834 InitializedEntity::InitializeBlock(CurrentLocation, 8835 DerefThis->getType(), 8836 /*NRVO=*/false), 8837 CurrentLocation, DerefThis); 8838 if (!Init.isInvalid()) 8839 Init = ActOnFinishFullExpr(Init.take()); 8840 8841 if (Init.isInvalid()) { 8842 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8843 Conv->setInvalidDecl(); 8844 return; 8845 } 8846 8847 // Create the new block to be returned. 8848 BlockDecl *Block = BlockDecl::Create(Context, Conv, Conv->getLocation()); 8849 8850 // Set the type information. 8851 Block->setSignatureAsWritten(CallOperator->getTypeSourceInfo()); 8852 Block->setIsVariadic(CallOperator->isVariadic()); 8853 Block->setBlockMissingReturnType(false); 8854 8855 // Add parameters. 8856 SmallVector<ParmVarDecl *, 4> BlockParams; 8857 for (unsigned I = 0, N = CallOperator->getNumParams(); I != N; ++I) { 8858 ParmVarDecl *From = CallOperator->getParamDecl(I); 8859 BlockParams.push_back(ParmVarDecl::Create(Context, Block, 8860 From->getLocStart(), 8861 From->getLocation(), 8862 From->getIdentifier(), 8863 From->getType(), 8864 From->getTypeSourceInfo(), 8865 From->getStorageClass(), 8866 From->getStorageClassAsWritten(), 8867 /*DefaultArg=*/0)); 8868 } 8869 Block->setParams(BlockParams); 8870 8871 // Add capture. The capture is uses a fake (NULL) variable, since we don't 8872 // actually want to have to name a capture variable. However, the 8873 // initializer copy-initializes the lambda object. 8874 BlockDecl::Capture Capture(/*Variable=*/0, /*ByRef=*/false, /*Nested=*/false, 8875 /*Copy=*/Init.take()); 8876 Block->setCaptures(Context, &Capture, &Capture + 1, 8877 /*CapturesCXXThis=*/false); 8878 8879 // Add a fake function body to the block. IR generation is responsible 8880 // for filling in the actual body, which cannot be expressed as an AST. 8881 Block->setBody(new (Context) CompoundStmt(Context, 0, 0, 8882 Conv->getLocation(), 8883 Conv->getLocation())); 8884 8885 // Create the block literal expression. 8886 Expr *BuildBlock = new (Context) BlockExpr(Block, Conv->getConversionType()); 8887 ExprCleanupObjects.push_back(Block); 8888 ExprNeedsCleanups = true; 8889 8890 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 8891 // behavior. 8892 if (!getLangOptions().ObjCAutoRefCount) 8893 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock->getType(), 8894 CK_CopyAndAutoreleaseBlockObject, 8895 BuildBlock, 0, VK_RValue); 8896 8897 // Create the return statement that returns the block from the conversion 8898 // function. 8899 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock); 8900 if (Return.isInvalid()) { 8901 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8902 Conv->setInvalidDecl(); 8903 return; 8904 } 8905 8906 // Set the body of the conversion function. 8907 Stmt *ReturnS = Return.take(); 8908 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 8909 Conv->getLocation(), 8910 Conv->getLocation())); 8911 8912 // We're done; notify the mutation listener, if any. 8913 if (ASTMutationListener *L = getASTMutationListener()) { 8914 L->CompletedImplicitDefinition(Conv); 8915 } 8916} 8917 8918ExprResult 8919Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8920 CXXConstructorDecl *Constructor, 8921 MultiExprArg ExprArgs, 8922 bool HadMultipleCandidates, 8923 bool RequiresZeroInit, 8924 unsigned ConstructKind, 8925 SourceRange ParenRange) { 8926 bool Elidable = false; 8927 8928 // C++0x [class.copy]p34: 8929 // When certain criteria are met, an implementation is allowed to 8930 // omit the copy/move construction of a class object, even if the 8931 // copy/move constructor and/or destructor for the object have 8932 // side effects. [...] 8933 // - when a temporary class object that has not been bound to a 8934 // reference (12.2) would be copied/moved to a class object 8935 // with the same cv-unqualified type, the copy/move operation 8936 // can be omitted by constructing the temporary object 8937 // directly into the target of the omitted copy/move 8938 if (ConstructKind == CXXConstructExpr::CK_Complete && 8939 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8940 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8941 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8942 } 8943 8944 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8945 Elidable, move(ExprArgs), HadMultipleCandidates, 8946 RequiresZeroInit, ConstructKind, ParenRange); 8947} 8948 8949/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8950/// including handling of its default argument expressions. 8951ExprResult 8952Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8953 CXXConstructorDecl *Constructor, bool Elidable, 8954 MultiExprArg ExprArgs, 8955 bool HadMultipleCandidates, 8956 bool RequiresZeroInit, 8957 unsigned ConstructKind, 8958 SourceRange ParenRange) { 8959 unsigned NumExprs = ExprArgs.size(); 8960 Expr **Exprs = (Expr **)ExprArgs.release(); 8961 8962 for (specific_attr_iterator<NonNullAttr> 8963 i = Constructor->specific_attr_begin<NonNullAttr>(), 8964 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8965 const NonNullAttr *NonNull = *i; 8966 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8967 } 8968 8969 MarkFunctionReferenced(ConstructLoc, Constructor); 8970 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8971 Constructor, Elidable, Exprs, NumExprs, 8972 HadMultipleCandidates, /*FIXME*/false, 8973 RequiresZeroInit, 8974 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8975 ParenRange)); 8976} 8977 8978bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8979 CXXConstructorDecl *Constructor, 8980 MultiExprArg Exprs, 8981 bool HadMultipleCandidates) { 8982 // FIXME: Provide the correct paren SourceRange when available. 8983 ExprResult TempResult = 8984 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8985 move(Exprs), HadMultipleCandidates, false, 8986 CXXConstructExpr::CK_Complete, SourceRange()); 8987 if (TempResult.isInvalid()) 8988 return true; 8989 8990 Expr *Temp = TempResult.takeAs<Expr>(); 8991 CheckImplicitConversions(Temp, VD->getLocation()); 8992 MarkFunctionReferenced(VD->getLocation(), Constructor); 8993 Temp = MaybeCreateExprWithCleanups(Temp); 8994 VD->setInit(Temp); 8995 8996 return false; 8997} 8998 8999void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9000 if (VD->isInvalidDecl()) return; 9001 9002 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9003 if (ClassDecl->isInvalidDecl()) return; 9004 if (ClassDecl->hasIrrelevantDestructor()) return; 9005 if (ClassDecl->isDependentContext()) return; 9006 9007 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9008 MarkFunctionReferenced(VD->getLocation(), Destructor); 9009 CheckDestructorAccess(VD->getLocation(), Destructor, 9010 PDiag(diag::err_access_dtor_var) 9011 << VD->getDeclName() 9012 << VD->getType()); 9013 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9014 9015 if (!VD->hasGlobalStorage()) return; 9016 9017 // Emit warning for non-trivial dtor in global scope (a real global, 9018 // class-static, function-static). 9019 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9020 9021 // TODO: this should be re-enabled for static locals by !CXAAtExit 9022 if (!VD->isStaticLocal()) 9023 Diag(VD->getLocation(), diag::warn_global_destructor); 9024} 9025 9026/// \brief Given a constructor and the set of arguments provided for the 9027/// constructor, convert the arguments and add any required default arguments 9028/// to form a proper call to this constructor. 9029/// 9030/// \returns true if an error occurred, false otherwise. 9031bool 9032Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9033 MultiExprArg ArgsPtr, 9034 SourceLocation Loc, 9035 ASTOwningVector<Expr*> &ConvertedArgs) { 9036 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9037 unsigned NumArgs = ArgsPtr.size(); 9038 Expr **Args = (Expr **)ArgsPtr.get(); 9039 9040 const FunctionProtoType *Proto 9041 = Constructor->getType()->getAs<FunctionProtoType>(); 9042 assert(Proto && "Constructor without a prototype?"); 9043 unsigned NumArgsInProto = Proto->getNumArgs(); 9044 9045 // If too few arguments are available, we'll fill in the rest with defaults. 9046 if (NumArgs < NumArgsInProto) 9047 ConvertedArgs.reserve(NumArgsInProto); 9048 else 9049 ConvertedArgs.reserve(NumArgs); 9050 9051 VariadicCallType CallType = 9052 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9053 SmallVector<Expr *, 8> AllArgs; 9054 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9055 Proto, 0, Args, NumArgs, AllArgs, 9056 CallType); 9057 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9058 9059 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9060 9061 // FIXME: Missing call to CheckFunctionCall or equivalent 9062 9063 return Invalid; 9064} 9065 9066static inline bool 9067CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9068 const FunctionDecl *FnDecl) { 9069 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9070 if (isa<NamespaceDecl>(DC)) { 9071 return SemaRef.Diag(FnDecl->getLocation(), 9072 diag::err_operator_new_delete_declared_in_namespace) 9073 << FnDecl->getDeclName(); 9074 } 9075 9076 if (isa<TranslationUnitDecl>(DC) && 9077 FnDecl->getStorageClass() == SC_Static) { 9078 return SemaRef.Diag(FnDecl->getLocation(), 9079 diag::err_operator_new_delete_declared_static) 9080 << FnDecl->getDeclName(); 9081 } 9082 9083 return false; 9084} 9085 9086static inline bool 9087CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9088 CanQualType ExpectedResultType, 9089 CanQualType ExpectedFirstParamType, 9090 unsigned DependentParamTypeDiag, 9091 unsigned InvalidParamTypeDiag) { 9092 QualType ResultType = 9093 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9094 9095 // Check that the result type is not dependent. 9096 if (ResultType->isDependentType()) 9097 return SemaRef.Diag(FnDecl->getLocation(), 9098 diag::err_operator_new_delete_dependent_result_type) 9099 << FnDecl->getDeclName() << ExpectedResultType; 9100 9101 // Check that the result type is what we expect. 9102 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9103 return SemaRef.Diag(FnDecl->getLocation(), 9104 diag::err_operator_new_delete_invalid_result_type) 9105 << FnDecl->getDeclName() << ExpectedResultType; 9106 9107 // A function template must have at least 2 parameters. 9108 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9109 return SemaRef.Diag(FnDecl->getLocation(), 9110 diag::err_operator_new_delete_template_too_few_parameters) 9111 << FnDecl->getDeclName(); 9112 9113 // The function decl must have at least 1 parameter. 9114 if (FnDecl->getNumParams() == 0) 9115 return SemaRef.Diag(FnDecl->getLocation(), 9116 diag::err_operator_new_delete_too_few_parameters) 9117 << FnDecl->getDeclName(); 9118 9119 // Check the the first parameter type is not dependent. 9120 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9121 if (FirstParamType->isDependentType()) 9122 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9123 << FnDecl->getDeclName() << ExpectedFirstParamType; 9124 9125 // Check that the first parameter type is what we expect. 9126 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9127 ExpectedFirstParamType) 9128 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9129 << FnDecl->getDeclName() << ExpectedFirstParamType; 9130 9131 return false; 9132} 9133 9134static bool 9135CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9136 // C++ [basic.stc.dynamic.allocation]p1: 9137 // A program is ill-formed if an allocation function is declared in a 9138 // namespace scope other than global scope or declared static in global 9139 // scope. 9140 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9141 return true; 9142 9143 CanQualType SizeTy = 9144 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9145 9146 // C++ [basic.stc.dynamic.allocation]p1: 9147 // The return type shall be void*. The first parameter shall have type 9148 // std::size_t. 9149 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9150 SizeTy, 9151 diag::err_operator_new_dependent_param_type, 9152 diag::err_operator_new_param_type)) 9153 return true; 9154 9155 // C++ [basic.stc.dynamic.allocation]p1: 9156 // The first parameter shall not have an associated default argument. 9157 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9158 return SemaRef.Diag(FnDecl->getLocation(), 9159 diag::err_operator_new_default_arg) 9160 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9161 9162 return false; 9163} 9164 9165static bool 9166CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9167 // C++ [basic.stc.dynamic.deallocation]p1: 9168 // A program is ill-formed if deallocation functions are declared in a 9169 // namespace scope other than global scope or declared static in global 9170 // scope. 9171 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9172 return true; 9173 9174 // C++ [basic.stc.dynamic.deallocation]p2: 9175 // Each deallocation function shall return void and its first parameter 9176 // shall be void*. 9177 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9178 SemaRef.Context.VoidPtrTy, 9179 diag::err_operator_delete_dependent_param_type, 9180 diag::err_operator_delete_param_type)) 9181 return true; 9182 9183 return false; 9184} 9185 9186/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9187/// of this overloaded operator is well-formed. If so, returns false; 9188/// otherwise, emits appropriate diagnostics and returns true. 9189bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9190 assert(FnDecl && FnDecl->isOverloadedOperator() && 9191 "Expected an overloaded operator declaration"); 9192 9193 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9194 9195 // C++ [over.oper]p5: 9196 // The allocation and deallocation functions, operator new, 9197 // operator new[], operator delete and operator delete[], are 9198 // described completely in 3.7.3. The attributes and restrictions 9199 // found in the rest of this subclause do not apply to them unless 9200 // explicitly stated in 3.7.3. 9201 if (Op == OO_Delete || Op == OO_Array_Delete) 9202 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9203 9204 if (Op == OO_New || Op == OO_Array_New) 9205 return CheckOperatorNewDeclaration(*this, FnDecl); 9206 9207 // C++ [over.oper]p6: 9208 // An operator function shall either be a non-static member 9209 // function or be a non-member function and have at least one 9210 // parameter whose type is a class, a reference to a class, an 9211 // enumeration, or a reference to an enumeration. 9212 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9213 if (MethodDecl->isStatic()) 9214 return Diag(FnDecl->getLocation(), 9215 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9216 } else { 9217 bool ClassOrEnumParam = false; 9218 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9219 ParamEnd = FnDecl->param_end(); 9220 Param != ParamEnd; ++Param) { 9221 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9222 if (ParamType->isDependentType() || ParamType->isRecordType() || 9223 ParamType->isEnumeralType()) { 9224 ClassOrEnumParam = true; 9225 break; 9226 } 9227 } 9228 9229 if (!ClassOrEnumParam) 9230 return Diag(FnDecl->getLocation(), 9231 diag::err_operator_overload_needs_class_or_enum) 9232 << FnDecl->getDeclName(); 9233 } 9234 9235 // C++ [over.oper]p8: 9236 // An operator function cannot have default arguments (8.3.6), 9237 // except where explicitly stated below. 9238 // 9239 // Only the function-call operator allows default arguments 9240 // (C++ [over.call]p1). 9241 if (Op != OO_Call) { 9242 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9243 Param != FnDecl->param_end(); ++Param) { 9244 if ((*Param)->hasDefaultArg()) 9245 return Diag((*Param)->getLocation(), 9246 diag::err_operator_overload_default_arg) 9247 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9248 } 9249 } 9250 9251 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9252 { false, false, false } 9253#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9254 , { Unary, Binary, MemberOnly } 9255#include "clang/Basic/OperatorKinds.def" 9256 }; 9257 9258 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9259 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9260 bool MustBeMemberOperator = OperatorUses[Op][2]; 9261 9262 // C++ [over.oper]p8: 9263 // [...] Operator functions cannot have more or fewer parameters 9264 // than the number required for the corresponding operator, as 9265 // described in the rest of this subclause. 9266 unsigned NumParams = FnDecl->getNumParams() 9267 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9268 if (Op != OO_Call && 9269 ((NumParams == 1 && !CanBeUnaryOperator) || 9270 (NumParams == 2 && !CanBeBinaryOperator) || 9271 (NumParams < 1) || (NumParams > 2))) { 9272 // We have the wrong number of parameters. 9273 unsigned ErrorKind; 9274 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9275 ErrorKind = 2; // 2 -> unary or binary. 9276 } else if (CanBeUnaryOperator) { 9277 ErrorKind = 0; // 0 -> unary 9278 } else { 9279 assert(CanBeBinaryOperator && 9280 "All non-call overloaded operators are unary or binary!"); 9281 ErrorKind = 1; // 1 -> binary 9282 } 9283 9284 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9285 << FnDecl->getDeclName() << NumParams << ErrorKind; 9286 } 9287 9288 // Overloaded operators other than operator() cannot be variadic. 9289 if (Op != OO_Call && 9290 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9291 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9292 << FnDecl->getDeclName(); 9293 } 9294 9295 // Some operators must be non-static member functions. 9296 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9297 return Diag(FnDecl->getLocation(), 9298 diag::err_operator_overload_must_be_member) 9299 << FnDecl->getDeclName(); 9300 } 9301 9302 // C++ [over.inc]p1: 9303 // The user-defined function called operator++ implements the 9304 // prefix and postfix ++ operator. If this function is a member 9305 // function with no parameters, or a non-member function with one 9306 // parameter of class or enumeration type, it defines the prefix 9307 // increment operator ++ for objects of that type. If the function 9308 // is a member function with one parameter (which shall be of type 9309 // int) or a non-member function with two parameters (the second 9310 // of which shall be of type int), it defines the postfix 9311 // increment operator ++ for objects of that type. 9312 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9313 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9314 bool ParamIsInt = false; 9315 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9316 ParamIsInt = BT->getKind() == BuiltinType::Int; 9317 9318 if (!ParamIsInt) 9319 return Diag(LastParam->getLocation(), 9320 diag::err_operator_overload_post_incdec_must_be_int) 9321 << LastParam->getType() << (Op == OO_MinusMinus); 9322 } 9323 9324 return false; 9325} 9326 9327/// CheckLiteralOperatorDeclaration - Check whether the declaration 9328/// of this literal operator function is well-formed. If so, returns 9329/// false; otherwise, emits appropriate diagnostics and returns true. 9330bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9331 DeclContext *DC = FnDecl->getDeclContext(); 9332 Decl::Kind Kind = DC->getDeclKind(); 9333 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9334 Kind != Decl::LinkageSpec) { 9335 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9336 << FnDecl->getDeclName(); 9337 return true; 9338 } 9339 9340 bool Valid = false; 9341 9342 // template <char...> type operator "" name() is the only valid template 9343 // signature, and the only valid signature with no parameters. 9344 if (FnDecl->param_size() == 0) { 9345 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9346 // Must have only one template parameter 9347 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9348 if (Params->size() == 1) { 9349 NonTypeTemplateParmDecl *PmDecl = 9350 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9351 9352 // The template parameter must be a char parameter pack. 9353 if (PmDecl && PmDecl->isTemplateParameterPack() && 9354 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9355 Valid = true; 9356 } 9357 } 9358 } else { 9359 // Check the first parameter 9360 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9361 9362 QualType T = (*Param)->getType(); 9363 9364 // unsigned long long int, long double, and any character type are allowed 9365 // as the only parameters. 9366 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9367 Context.hasSameType(T, Context.LongDoubleTy) || 9368 Context.hasSameType(T, Context.CharTy) || 9369 Context.hasSameType(T, Context.WCharTy) || 9370 Context.hasSameType(T, Context.Char16Ty) || 9371 Context.hasSameType(T, Context.Char32Ty)) { 9372 if (++Param == FnDecl->param_end()) 9373 Valid = true; 9374 goto FinishedParams; 9375 } 9376 9377 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9378 const PointerType *PT = T->getAs<PointerType>(); 9379 if (!PT) 9380 goto FinishedParams; 9381 T = PT->getPointeeType(); 9382 if (!T.isConstQualified()) 9383 goto FinishedParams; 9384 T = T.getUnqualifiedType(); 9385 9386 // Move on to the second parameter; 9387 ++Param; 9388 9389 // If there is no second parameter, the first must be a const char * 9390 if (Param == FnDecl->param_end()) { 9391 if (Context.hasSameType(T, Context.CharTy)) 9392 Valid = true; 9393 goto FinishedParams; 9394 } 9395 9396 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9397 // are allowed as the first parameter to a two-parameter function 9398 if (!(Context.hasSameType(T, Context.CharTy) || 9399 Context.hasSameType(T, Context.WCharTy) || 9400 Context.hasSameType(T, Context.Char16Ty) || 9401 Context.hasSameType(T, Context.Char32Ty))) 9402 goto FinishedParams; 9403 9404 // The second and final parameter must be an std::size_t 9405 T = (*Param)->getType().getUnqualifiedType(); 9406 if (Context.hasSameType(T, Context.getSizeType()) && 9407 ++Param == FnDecl->param_end()) 9408 Valid = true; 9409 } 9410 9411 // FIXME: This diagnostic is absolutely terrible. 9412FinishedParams: 9413 if (!Valid) { 9414 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9415 << FnDecl->getDeclName(); 9416 return true; 9417 } 9418 9419 StringRef LiteralName 9420 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9421 if (LiteralName[0] != '_') { 9422 // C++0x [usrlit.suffix]p1: 9423 // Literal suffix identifiers that do not start with an underscore are 9424 // reserved for future standardization. 9425 bool IsHexFloat = true; 9426 if (LiteralName.size() > 1 && 9427 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9428 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9429 if (!isdigit(LiteralName[I])) { 9430 IsHexFloat = false; 9431 break; 9432 } 9433 } 9434 } 9435 9436 if (IsHexFloat) 9437 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9438 << LiteralName; 9439 else 9440 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9441 } 9442 9443 return false; 9444} 9445 9446/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9447/// linkage specification, including the language and (if present) 9448/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9449/// the location of the language string literal, which is provided 9450/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9451/// the '{' brace. Otherwise, this linkage specification does not 9452/// have any braces. 9453Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9454 SourceLocation LangLoc, 9455 StringRef Lang, 9456 SourceLocation LBraceLoc) { 9457 LinkageSpecDecl::LanguageIDs Language; 9458 if (Lang == "\"C\"") 9459 Language = LinkageSpecDecl::lang_c; 9460 else if (Lang == "\"C++\"") 9461 Language = LinkageSpecDecl::lang_cxx; 9462 else { 9463 Diag(LangLoc, diag::err_bad_language); 9464 return 0; 9465 } 9466 9467 // FIXME: Add all the various semantics of linkage specifications 9468 9469 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9470 ExternLoc, LangLoc, Language); 9471 CurContext->addDecl(D); 9472 PushDeclContext(S, D); 9473 return D; 9474} 9475 9476/// ActOnFinishLinkageSpecification - Complete the definition of 9477/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9478/// valid, it's the position of the closing '}' brace in a linkage 9479/// specification that uses braces. 9480Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9481 Decl *LinkageSpec, 9482 SourceLocation RBraceLoc) { 9483 if (LinkageSpec) { 9484 if (RBraceLoc.isValid()) { 9485 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9486 LSDecl->setRBraceLoc(RBraceLoc); 9487 } 9488 PopDeclContext(); 9489 } 9490 return LinkageSpec; 9491} 9492 9493/// \brief Perform semantic analysis for the variable declaration that 9494/// occurs within a C++ catch clause, returning the newly-created 9495/// variable. 9496VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9497 TypeSourceInfo *TInfo, 9498 SourceLocation StartLoc, 9499 SourceLocation Loc, 9500 IdentifierInfo *Name) { 9501 bool Invalid = false; 9502 QualType ExDeclType = TInfo->getType(); 9503 9504 // Arrays and functions decay. 9505 if (ExDeclType->isArrayType()) 9506 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9507 else if (ExDeclType->isFunctionType()) 9508 ExDeclType = Context.getPointerType(ExDeclType); 9509 9510 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9511 // The exception-declaration shall not denote a pointer or reference to an 9512 // incomplete type, other than [cv] void*. 9513 // N2844 forbids rvalue references. 9514 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9515 Diag(Loc, diag::err_catch_rvalue_ref); 9516 Invalid = true; 9517 } 9518 9519 QualType BaseType = ExDeclType; 9520 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9521 unsigned DK = diag::err_catch_incomplete; 9522 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9523 BaseType = Ptr->getPointeeType(); 9524 Mode = 1; 9525 DK = diag::err_catch_incomplete_ptr; 9526 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9527 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9528 BaseType = Ref->getPointeeType(); 9529 Mode = 2; 9530 DK = diag::err_catch_incomplete_ref; 9531 } 9532 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9533 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9534 Invalid = true; 9535 9536 if (!Invalid && !ExDeclType->isDependentType() && 9537 RequireNonAbstractType(Loc, ExDeclType, 9538 diag::err_abstract_type_in_decl, 9539 AbstractVariableType)) 9540 Invalid = true; 9541 9542 // Only the non-fragile NeXT runtime currently supports C++ catches 9543 // of ObjC types, and no runtime supports catching ObjC types by value. 9544 if (!Invalid && getLangOptions().ObjC1) { 9545 QualType T = ExDeclType; 9546 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9547 T = RT->getPointeeType(); 9548 9549 if (T->isObjCObjectType()) { 9550 Diag(Loc, diag::err_objc_object_catch); 9551 Invalid = true; 9552 } else if (T->isObjCObjectPointerType()) { 9553 if (!getLangOptions().ObjCNonFragileABI) 9554 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9555 } 9556 } 9557 9558 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9559 ExDeclType, TInfo, SC_None, SC_None); 9560 ExDecl->setExceptionVariable(true); 9561 9562 // In ARC, infer 'retaining' for variables of retainable type. 9563 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9564 Invalid = true; 9565 9566 if (!Invalid && !ExDeclType->isDependentType()) { 9567 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9568 // C++ [except.handle]p16: 9569 // The object declared in an exception-declaration or, if the 9570 // exception-declaration does not specify a name, a temporary (12.2) is 9571 // copy-initialized (8.5) from the exception object. [...] 9572 // The object is destroyed when the handler exits, after the destruction 9573 // of any automatic objects initialized within the handler. 9574 // 9575 // We just pretend to initialize the object with itself, then make sure 9576 // it can be destroyed later. 9577 QualType initType = ExDeclType; 9578 9579 InitializedEntity entity = 9580 InitializedEntity::InitializeVariable(ExDecl); 9581 InitializationKind initKind = 9582 InitializationKind::CreateCopy(Loc, SourceLocation()); 9583 9584 Expr *opaqueValue = 9585 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9586 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9587 ExprResult result = sequence.Perform(*this, entity, initKind, 9588 MultiExprArg(&opaqueValue, 1)); 9589 if (result.isInvalid()) 9590 Invalid = true; 9591 else { 9592 // If the constructor used was non-trivial, set this as the 9593 // "initializer". 9594 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9595 if (!construct->getConstructor()->isTrivial()) { 9596 Expr *init = MaybeCreateExprWithCleanups(construct); 9597 ExDecl->setInit(init); 9598 } 9599 9600 // And make sure it's destructable. 9601 FinalizeVarWithDestructor(ExDecl, recordType); 9602 } 9603 } 9604 } 9605 9606 if (Invalid) 9607 ExDecl->setInvalidDecl(); 9608 9609 return ExDecl; 9610} 9611 9612/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9613/// handler. 9614Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9615 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9616 bool Invalid = D.isInvalidType(); 9617 9618 // Check for unexpanded parameter packs. 9619 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9620 UPPC_ExceptionType)) { 9621 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9622 D.getIdentifierLoc()); 9623 Invalid = true; 9624 } 9625 9626 IdentifierInfo *II = D.getIdentifier(); 9627 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9628 LookupOrdinaryName, 9629 ForRedeclaration)) { 9630 // The scope should be freshly made just for us. There is just no way 9631 // it contains any previous declaration. 9632 assert(!S->isDeclScope(PrevDecl)); 9633 if (PrevDecl->isTemplateParameter()) { 9634 // Maybe we will complain about the shadowed template parameter. 9635 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9636 PrevDecl = 0; 9637 } 9638 } 9639 9640 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9641 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9642 << D.getCXXScopeSpec().getRange(); 9643 Invalid = true; 9644 } 9645 9646 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9647 D.getSourceRange().getBegin(), 9648 D.getIdentifierLoc(), 9649 D.getIdentifier()); 9650 if (Invalid) 9651 ExDecl->setInvalidDecl(); 9652 9653 // Add the exception declaration into this scope. 9654 if (II) 9655 PushOnScopeChains(ExDecl, S); 9656 else 9657 CurContext->addDecl(ExDecl); 9658 9659 ProcessDeclAttributes(S, ExDecl, D); 9660 return ExDecl; 9661} 9662 9663Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9664 Expr *AssertExpr, 9665 Expr *AssertMessageExpr_, 9666 SourceLocation RParenLoc) { 9667 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9668 9669 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9670 // In a static_assert-declaration, the constant-expression shall be a 9671 // constant expression that can be contextually converted to bool. 9672 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9673 if (Converted.isInvalid()) 9674 return 0; 9675 9676 llvm::APSInt Cond; 9677 if (VerifyIntegerConstantExpression(Converted.get(), &Cond, 9678 PDiag(diag::err_static_assert_expression_is_not_constant), 9679 /*AllowFold=*/false).isInvalid()) 9680 return 0; 9681 9682 if (!Cond) 9683 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9684 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9685 } 9686 9687 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9688 return 0; 9689 9690 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9691 AssertExpr, AssertMessage, RParenLoc); 9692 9693 CurContext->addDecl(Decl); 9694 return Decl; 9695} 9696 9697/// \brief Perform semantic analysis of the given friend type declaration. 9698/// 9699/// \returns A friend declaration that. 9700FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9701 SourceLocation FriendLoc, 9702 TypeSourceInfo *TSInfo) { 9703 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9704 9705 QualType T = TSInfo->getType(); 9706 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9707 9708 // C++03 [class.friend]p2: 9709 // An elaborated-type-specifier shall be used in a friend declaration 9710 // for a class.* 9711 // 9712 // * The class-key of the elaborated-type-specifier is required. 9713 if (!ActiveTemplateInstantiations.empty()) { 9714 // Do not complain about the form of friend template types during 9715 // template instantiation; we will already have complained when the 9716 // template was declared. 9717 } else if (!T->isElaboratedTypeSpecifier()) { 9718 // If we evaluated the type to a record type, suggest putting 9719 // a tag in front. 9720 if (const RecordType *RT = T->getAs<RecordType>()) { 9721 RecordDecl *RD = RT->getDecl(); 9722 9723 std::string InsertionText = std::string(" ") + RD->getKindName(); 9724 9725 Diag(TypeRange.getBegin(), 9726 getLangOptions().CPlusPlus0x ? 9727 diag::warn_cxx98_compat_unelaborated_friend_type : 9728 diag::ext_unelaborated_friend_type) 9729 << (unsigned) RD->getTagKind() 9730 << T 9731 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9732 InsertionText); 9733 } else { 9734 Diag(FriendLoc, 9735 getLangOptions().CPlusPlus0x ? 9736 diag::warn_cxx98_compat_nonclass_type_friend : 9737 diag::ext_nonclass_type_friend) 9738 << T 9739 << SourceRange(FriendLoc, TypeRange.getEnd()); 9740 } 9741 } else if (T->getAs<EnumType>()) { 9742 Diag(FriendLoc, 9743 getLangOptions().CPlusPlus0x ? 9744 diag::warn_cxx98_compat_enum_friend : 9745 diag::ext_enum_friend) 9746 << T 9747 << SourceRange(FriendLoc, TypeRange.getEnd()); 9748 } 9749 9750 // C++0x [class.friend]p3: 9751 // If the type specifier in a friend declaration designates a (possibly 9752 // cv-qualified) class type, that class is declared as a friend; otherwise, 9753 // the friend declaration is ignored. 9754 9755 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9756 // in [class.friend]p3 that we do not implement. 9757 9758 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9759} 9760 9761/// Handle a friend tag declaration where the scope specifier was 9762/// templated. 9763Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9764 unsigned TagSpec, SourceLocation TagLoc, 9765 CXXScopeSpec &SS, 9766 IdentifierInfo *Name, SourceLocation NameLoc, 9767 AttributeList *Attr, 9768 MultiTemplateParamsArg TempParamLists) { 9769 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9770 9771 bool isExplicitSpecialization = false; 9772 bool Invalid = false; 9773 9774 if (TemplateParameterList *TemplateParams 9775 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9776 TempParamLists.get(), 9777 TempParamLists.size(), 9778 /*friend*/ true, 9779 isExplicitSpecialization, 9780 Invalid)) { 9781 if (TemplateParams->size() > 0) { 9782 // This is a declaration of a class template. 9783 if (Invalid) 9784 return 0; 9785 9786 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9787 SS, Name, NameLoc, Attr, 9788 TemplateParams, AS_public, 9789 /*ModulePrivateLoc=*/SourceLocation(), 9790 TempParamLists.size() - 1, 9791 (TemplateParameterList**) TempParamLists.release()).take(); 9792 } else { 9793 // The "template<>" header is extraneous. 9794 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9795 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9796 isExplicitSpecialization = true; 9797 } 9798 } 9799 9800 if (Invalid) return 0; 9801 9802 bool isAllExplicitSpecializations = true; 9803 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9804 if (TempParamLists.get()[I]->size()) { 9805 isAllExplicitSpecializations = false; 9806 break; 9807 } 9808 } 9809 9810 // FIXME: don't ignore attributes. 9811 9812 // If it's explicit specializations all the way down, just forget 9813 // about the template header and build an appropriate non-templated 9814 // friend. TODO: for source fidelity, remember the headers. 9815 if (isAllExplicitSpecializations) { 9816 if (SS.isEmpty()) { 9817 bool Owned = false; 9818 bool IsDependent = false; 9819 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9820 Attr, AS_public, 9821 /*ModulePrivateLoc=*/SourceLocation(), 9822 MultiTemplateParamsArg(), Owned, IsDependent, 9823 /*ScopedEnumKWLoc=*/SourceLocation(), 9824 /*ScopedEnumUsesClassTag=*/false, 9825 /*UnderlyingType=*/TypeResult()); 9826 } 9827 9828 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9829 ElaboratedTypeKeyword Keyword 9830 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9831 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9832 *Name, NameLoc); 9833 if (T.isNull()) 9834 return 0; 9835 9836 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9837 if (isa<DependentNameType>(T)) { 9838 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9839 TL.setElaboratedKeywordLoc(TagLoc); 9840 TL.setQualifierLoc(QualifierLoc); 9841 TL.setNameLoc(NameLoc); 9842 } else { 9843 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9844 TL.setElaboratedKeywordLoc(TagLoc); 9845 TL.setQualifierLoc(QualifierLoc); 9846 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9847 } 9848 9849 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9850 TSI, FriendLoc); 9851 Friend->setAccess(AS_public); 9852 CurContext->addDecl(Friend); 9853 return Friend; 9854 } 9855 9856 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9857 9858 9859 9860 // Handle the case of a templated-scope friend class. e.g. 9861 // template <class T> class A<T>::B; 9862 // FIXME: we don't support these right now. 9863 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9864 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9865 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9866 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9867 TL.setElaboratedKeywordLoc(TagLoc); 9868 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9869 TL.setNameLoc(NameLoc); 9870 9871 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9872 TSI, FriendLoc); 9873 Friend->setAccess(AS_public); 9874 Friend->setUnsupportedFriend(true); 9875 CurContext->addDecl(Friend); 9876 return Friend; 9877} 9878 9879 9880/// Handle a friend type declaration. This works in tandem with 9881/// ActOnTag. 9882/// 9883/// Notes on friend class templates: 9884/// 9885/// We generally treat friend class declarations as if they were 9886/// declaring a class. So, for example, the elaborated type specifier 9887/// in a friend declaration is required to obey the restrictions of a 9888/// class-head (i.e. no typedefs in the scope chain), template 9889/// parameters are required to match up with simple template-ids, &c. 9890/// However, unlike when declaring a template specialization, it's 9891/// okay to refer to a template specialization without an empty 9892/// template parameter declaration, e.g. 9893/// friend class A<T>::B<unsigned>; 9894/// We permit this as a special case; if there are any template 9895/// parameters present at all, require proper matching, i.e. 9896/// template <> template <class T> friend class A<int>::B; 9897Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9898 MultiTemplateParamsArg TempParams) { 9899 SourceLocation Loc = DS.getSourceRange().getBegin(); 9900 9901 assert(DS.isFriendSpecified()); 9902 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9903 9904 // Try to convert the decl specifier to a type. This works for 9905 // friend templates because ActOnTag never produces a ClassTemplateDecl 9906 // for a TUK_Friend. 9907 Declarator TheDeclarator(DS, Declarator::MemberContext); 9908 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9909 QualType T = TSI->getType(); 9910 if (TheDeclarator.isInvalidType()) 9911 return 0; 9912 9913 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9914 return 0; 9915 9916 // This is definitely an error in C++98. It's probably meant to 9917 // be forbidden in C++0x, too, but the specification is just 9918 // poorly written. 9919 // 9920 // The problem is with declarations like the following: 9921 // template <T> friend A<T>::foo; 9922 // where deciding whether a class C is a friend or not now hinges 9923 // on whether there exists an instantiation of A that causes 9924 // 'foo' to equal C. There are restrictions on class-heads 9925 // (which we declare (by fiat) elaborated friend declarations to 9926 // be) that makes this tractable. 9927 // 9928 // FIXME: handle "template <> friend class A<T>;", which 9929 // is possibly well-formed? Who even knows? 9930 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9931 Diag(Loc, diag::err_tagless_friend_type_template) 9932 << DS.getSourceRange(); 9933 return 0; 9934 } 9935 9936 // C++98 [class.friend]p1: A friend of a class is a function 9937 // or class that is not a member of the class . . . 9938 // This is fixed in DR77, which just barely didn't make the C++03 9939 // deadline. It's also a very silly restriction that seriously 9940 // affects inner classes and which nobody else seems to implement; 9941 // thus we never diagnose it, not even in -pedantic. 9942 // 9943 // But note that we could warn about it: it's always useless to 9944 // friend one of your own members (it's not, however, worthless to 9945 // friend a member of an arbitrary specialization of your template). 9946 9947 Decl *D; 9948 if (unsigned NumTempParamLists = TempParams.size()) 9949 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9950 NumTempParamLists, 9951 TempParams.release(), 9952 TSI, 9953 DS.getFriendSpecLoc()); 9954 else 9955 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 9956 9957 if (!D) 9958 return 0; 9959 9960 D->setAccess(AS_public); 9961 CurContext->addDecl(D); 9962 9963 return D; 9964} 9965 9966Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 9967 MultiTemplateParamsArg TemplateParams) { 9968 const DeclSpec &DS = D.getDeclSpec(); 9969 9970 assert(DS.isFriendSpecified()); 9971 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9972 9973 SourceLocation Loc = D.getIdentifierLoc(); 9974 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9975 9976 // C++ [class.friend]p1 9977 // A friend of a class is a function or class.... 9978 // Note that this sees through typedefs, which is intended. 9979 // It *doesn't* see through dependent types, which is correct 9980 // according to [temp.arg.type]p3: 9981 // If a declaration acquires a function type through a 9982 // type dependent on a template-parameter and this causes 9983 // a declaration that does not use the syntactic form of a 9984 // function declarator to have a function type, the program 9985 // is ill-formed. 9986 if (!TInfo->getType()->isFunctionType()) { 9987 Diag(Loc, diag::err_unexpected_friend); 9988 9989 // It might be worthwhile to try to recover by creating an 9990 // appropriate declaration. 9991 return 0; 9992 } 9993 9994 // C++ [namespace.memdef]p3 9995 // - If a friend declaration in a non-local class first declares a 9996 // class or function, the friend class or function is a member 9997 // of the innermost enclosing namespace. 9998 // - The name of the friend is not found by simple name lookup 9999 // until a matching declaration is provided in that namespace 10000 // scope (either before or after the class declaration granting 10001 // friendship). 10002 // - If a friend function is called, its name may be found by the 10003 // name lookup that considers functions from namespaces and 10004 // classes associated with the types of the function arguments. 10005 // - When looking for a prior declaration of a class or a function 10006 // declared as a friend, scopes outside the innermost enclosing 10007 // namespace scope are not considered. 10008 10009 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10010 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10011 DeclarationName Name = NameInfo.getName(); 10012 assert(Name); 10013 10014 // Check for unexpanded parameter packs. 10015 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10016 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10017 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10018 return 0; 10019 10020 // The context we found the declaration in, or in which we should 10021 // create the declaration. 10022 DeclContext *DC; 10023 Scope *DCScope = S; 10024 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10025 ForRedeclaration); 10026 10027 // FIXME: there are different rules in local classes 10028 10029 // There are four cases here. 10030 // - There's no scope specifier, in which case we just go to the 10031 // appropriate scope and look for a function or function template 10032 // there as appropriate. 10033 // Recover from invalid scope qualifiers as if they just weren't there. 10034 if (SS.isInvalid() || !SS.isSet()) { 10035 // C++0x [namespace.memdef]p3: 10036 // If the name in a friend declaration is neither qualified nor 10037 // a template-id and the declaration is a function or an 10038 // elaborated-type-specifier, the lookup to determine whether 10039 // the entity has been previously declared shall not consider 10040 // any scopes outside the innermost enclosing namespace. 10041 // C++0x [class.friend]p11: 10042 // If a friend declaration appears in a local class and the name 10043 // specified is an unqualified name, a prior declaration is 10044 // looked up without considering scopes that are outside the 10045 // innermost enclosing non-class scope. For a friend function 10046 // declaration, if there is no prior declaration, the program is 10047 // ill-formed. 10048 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10049 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10050 10051 // Find the appropriate context according to the above. 10052 DC = CurContext; 10053 while (true) { 10054 // Skip class contexts. If someone can cite chapter and verse 10055 // for this behavior, that would be nice --- it's what GCC and 10056 // EDG do, and it seems like a reasonable intent, but the spec 10057 // really only says that checks for unqualified existing 10058 // declarations should stop at the nearest enclosing namespace, 10059 // not that they should only consider the nearest enclosing 10060 // namespace. 10061 while (DC->isRecord()) 10062 DC = DC->getParent(); 10063 10064 LookupQualifiedName(Previous, DC); 10065 10066 // TODO: decide what we think about using declarations. 10067 if (isLocal || !Previous.empty()) 10068 break; 10069 10070 if (isTemplateId) { 10071 if (isa<TranslationUnitDecl>(DC)) break; 10072 } else { 10073 if (DC->isFileContext()) break; 10074 } 10075 DC = DC->getParent(); 10076 } 10077 10078 // C++ [class.friend]p1: A friend of a class is a function or 10079 // class that is not a member of the class . . . 10080 // C++11 changes this for both friend types and functions. 10081 // Most C++ 98 compilers do seem to give an error here, so 10082 // we do, too. 10083 if (!Previous.empty() && DC->Equals(CurContext)) 10084 Diag(DS.getFriendSpecLoc(), 10085 getLangOptions().CPlusPlus0x ? 10086 diag::warn_cxx98_compat_friend_is_member : 10087 diag::err_friend_is_member); 10088 10089 DCScope = getScopeForDeclContext(S, DC); 10090 10091 // C++ [class.friend]p6: 10092 // A function can be defined in a friend declaration of a class if and 10093 // only if the class is a non-local class (9.8), the function name is 10094 // unqualified, and the function has namespace scope. 10095 if (isLocal && D.isFunctionDefinition()) { 10096 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10097 } 10098 10099 // - There's a non-dependent scope specifier, in which case we 10100 // compute it and do a previous lookup there for a function 10101 // or function template. 10102 } else if (!SS.getScopeRep()->isDependent()) { 10103 DC = computeDeclContext(SS); 10104 if (!DC) return 0; 10105 10106 if (RequireCompleteDeclContext(SS, DC)) return 0; 10107 10108 LookupQualifiedName(Previous, DC); 10109 10110 // Ignore things found implicitly in the wrong scope. 10111 // TODO: better diagnostics for this case. Suggesting the right 10112 // qualified scope would be nice... 10113 LookupResult::Filter F = Previous.makeFilter(); 10114 while (F.hasNext()) { 10115 NamedDecl *D = F.next(); 10116 if (!DC->InEnclosingNamespaceSetOf( 10117 D->getDeclContext()->getRedeclContext())) 10118 F.erase(); 10119 } 10120 F.done(); 10121 10122 if (Previous.empty()) { 10123 D.setInvalidType(); 10124 Diag(Loc, diag::err_qualified_friend_not_found) 10125 << Name << TInfo->getType(); 10126 return 0; 10127 } 10128 10129 // C++ [class.friend]p1: A friend of a class is a function or 10130 // class that is not a member of the class . . . 10131 if (DC->Equals(CurContext)) 10132 Diag(DS.getFriendSpecLoc(), 10133 getLangOptions().CPlusPlus0x ? 10134 diag::warn_cxx98_compat_friend_is_member : 10135 diag::err_friend_is_member); 10136 10137 if (D.isFunctionDefinition()) { 10138 // C++ [class.friend]p6: 10139 // A function can be defined in a friend declaration of a class if and 10140 // only if the class is a non-local class (9.8), the function name is 10141 // unqualified, and the function has namespace scope. 10142 SemaDiagnosticBuilder DB 10143 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10144 10145 DB << SS.getScopeRep(); 10146 if (DC->isFileContext()) 10147 DB << FixItHint::CreateRemoval(SS.getRange()); 10148 SS.clear(); 10149 } 10150 10151 // - There's a scope specifier that does not match any template 10152 // parameter lists, in which case we use some arbitrary context, 10153 // create a method or method template, and wait for instantiation. 10154 // - There's a scope specifier that does match some template 10155 // parameter lists, which we don't handle right now. 10156 } else { 10157 if (D.isFunctionDefinition()) { 10158 // C++ [class.friend]p6: 10159 // A function can be defined in a friend declaration of a class if and 10160 // only if the class is a non-local class (9.8), the function name is 10161 // unqualified, and the function has namespace scope. 10162 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10163 << SS.getScopeRep(); 10164 } 10165 10166 DC = CurContext; 10167 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10168 } 10169 10170 if (!DC->isRecord()) { 10171 // This implies that it has to be an operator or function. 10172 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10173 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10174 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10175 Diag(Loc, diag::err_introducing_special_friend) << 10176 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10177 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10178 return 0; 10179 } 10180 } 10181 10182 // FIXME: This is an egregious hack to cope with cases where the scope stack 10183 // does not contain the declaration context, i.e., in an out-of-line 10184 // definition of a class. 10185 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10186 if (!DCScope) { 10187 FakeDCScope.setEntity(DC); 10188 DCScope = &FakeDCScope; 10189 } 10190 10191 bool AddToScope = true; 10192 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10193 move(TemplateParams), AddToScope); 10194 if (!ND) return 0; 10195 10196 assert(ND->getDeclContext() == DC); 10197 assert(ND->getLexicalDeclContext() == CurContext); 10198 10199 // Add the function declaration to the appropriate lookup tables, 10200 // adjusting the redeclarations list as necessary. We don't 10201 // want to do this yet if the friending class is dependent. 10202 // 10203 // Also update the scope-based lookup if the target context's 10204 // lookup context is in lexical scope. 10205 if (!CurContext->isDependentContext()) { 10206 DC = DC->getRedeclContext(); 10207 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10208 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10209 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10210 } 10211 10212 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10213 D.getIdentifierLoc(), ND, 10214 DS.getFriendSpecLoc()); 10215 FrD->setAccess(AS_public); 10216 CurContext->addDecl(FrD); 10217 10218 if (ND->isInvalidDecl()) 10219 FrD->setInvalidDecl(); 10220 else { 10221 FunctionDecl *FD; 10222 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10223 FD = FTD->getTemplatedDecl(); 10224 else 10225 FD = cast<FunctionDecl>(ND); 10226 10227 // Mark templated-scope function declarations as unsupported. 10228 if (FD->getNumTemplateParameterLists()) 10229 FrD->setUnsupportedFriend(true); 10230 } 10231 10232 return ND; 10233} 10234 10235void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10236 AdjustDeclIfTemplate(Dcl); 10237 10238 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10239 if (!Fn) { 10240 Diag(DelLoc, diag::err_deleted_non_function); 10241 return; 10242 } 10243 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10244 Diag(DelLoc, diag::err_deleted_decl_not_first); 10245 Diag(Prev->getLocation(), diag::note_previous_declaration); 10246 // If the declaration wasn't the first, we delete the function anyway for 10247 // recovery. 10248 } 10249 Fn->setDeletedAsWritten(); 10250} 10251 10252void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10253 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10254 10255 if (MD) { 10256 if (MD->getParent()->isDependentType()) { 10257 MD->setDefaulted(); 10258 MD->setExplicitlyDefaulted(); 10259 return; 10260 } 10261 10262 CXXSpecialMember Member = getSpecialMember(MD); 10263 if (Member == CXXInvalid) { 10264 Diag(DefaultLoc, diag::err_default_special_members); 10265 return; 10266 } 10267 10268 MD->setDefaulted(); 10269 MD->setExplicitlyDefaulted(); 10270 10271 // If this definition appears within the record, do the checking when 10272 // the record is complete. 10273 const FunctionDecl *Primary = MD; 10274 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10275 // Find the uninstantiated declaration that actually had the '= default' 10276 // on it. 10277 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10278 10279 if (Primary == Primary->getCanonicalDecl()) 10280 return; 10281 10282 switch (Member) { 10283 case CXXDefaultConstructor: { 10284 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10285 CheckExplicitlyDefaultedDefaultConstructor(CD); 10286 if (!CD->isInvalidDecl()) 10287 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10288 break; 10289 } 10290 10291 case CXXCopyConstructor: { 10292 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10293 CheckExplicitlyDefaultedCopyConstructor(CD); 10294 if (!CD->isInvalidDecl()) 10295 DefineImplicitCopyConstructor(DefaultLoc, CD); 10296 break; 10297 } 10298 10299 case CXXCopyAssignment: { 10300 CheckExplicitlyDefaultedCopyAssignment(MD); 10301 if (!MD->isInvalidDecl()) 10302 DefineImplicitCopyAssignment(DefaultLoc, MD); 10303 break; 10304 } 10305 10306 case CXXDestructor: { 10307 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10308 CheckExplicitlyDefaultedDestructor(DD); 10309 if (!DD->isInvalidDecl()) 10310 DefineImplicitDestructor(DefaultLoc, DD); 10311 break; 10312 } 10313 10314 case CXXMoveConstructor: { 10315 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10316 CheckExplicitlyDefaultedMoveConstructor(CD); 10317 if (!CD->isInvalidDecl()) 10318 DefineImplicitMoveConstructor(DefaultLoc, CD); 10319 break; 10320 } 10321 10322 case CXXMoveAssignment: { 10323 CheckExplicitlyDefaultedMoveAssignment(MD); 10324 if (!MD->isInvalidDecl()) 10325 DefineImplicitMoveAssignment(DefaultLoc, MD); 10326 break; 10327 } 10328 10329 case CXXInvalid: 10330 llvm_unreachable("Invalid special member."); 10331 } 10332 } else { 10333 Diag(DefaultLoc, diag::err_default_special_members); 10334 } 10335} 10336 10337static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10338 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10339 Stmt *SubStmt = *CI; 10340 if (!SubStmt) 10341 continue; 10342 if (isa<ReturnStmt>(SubStmt)) 10343 Self.Diag(SubStmt->getSourceRange().getBegin(), 10344 diag::err_return_in_constructor_handler); 10345 if (!isa<Expr>(SubStmt)) 10346 SearchForReturnInStmt(Self, SubStmt); 10347 } 10348} 10349 10350void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10351 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10352 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10353 SearchForReturnInStmt(*this, Handler); 10354 } 10355} 10356 10357bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10358 const CXXMethodDecl *Old) { 10359 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10360 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10361 10362 if (Context.hasSameType(NewTy, OldTy) || 10363 NewTy->isDependentType() || OldTy->isDependentType()) 10364 return false; 10365 10366 // Check if the return types are covariant 10367 QualType NewClassTy, OldClassTy; 10368 10369 /// Both types must be pointers or references to classes. 10370 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10371 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10372 NewClassTy = NewPT->getPointeeType(); 10373 OldClassTy = OldPT->getPointeeType(); 10374 } 10375 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10376 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10377 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10378 NewClassTy = NewRT->getPointeeType(); 10379 OldClassTy = OldRT->getPointeeType(); 10380 } 10381 } 10382 } 10383 10384 // The return types aren't either both pointers or references to a class type. 10385 if (NewClassTy.isNull()) { 10386 Diag(New->getLocation(), 10387 diag::err_different_return_type_for_overriding_virtual_function) 10388 << New->getDeclName() << NewTy << OldTy; 10389 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10390 10391 return true; 10392 } 10393 10394 // C++ [class.virtual]p6: 10395 // If the return type of D::f differs from the return type of B::f, the 10396 // class type in the return type of D::f shall be complete at the point of 10397 // declaration of D::f or shall be the class type D. 10398 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10399 if (!RT->isBeingDefined() && 10400 RequireCompleteType(New->getLocation(), NewClassTy, 10401 PDiag(diag::err_covariant_return_incomplete) 10402 << New->getDeclName())) 10403 return true; 10404 } 10405 10406 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10407 // Check if the new class derives from the old class. 10408 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10409 Diag(New->getLocation(), 10410 diag::err_covariant_return_not_derived) 10411 << New->getDeclName() << NewTy << OldTy; 10412 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10413 return true; 10414 } 10415 10416 // Check if we the conversion from derived to base is valid. 10417 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10418 diag::err_covariant_return_inaccessible_base, 10419 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10420 // FIXME: Should this point to the return type? 10421 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10422 // FIXME: this note won't trigger for delayed access control 10423 // diagnostics, and it's impossible to get an undelayed error 10424 // here from access control during the original parse because 10425 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10426 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10427 return true; 10428 } 10429 } 10430 10431 // The qualifiers of the return types must be the same. 10432 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10433 Diag(New->getLocation(), 10434 diag::err_covariant_return_type_different_qualifications) 10435 << New->getDeclName() << NewTy << OldTy; 10436 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10437 return true; 10438 }; 10439 10440 10441 // The new class type must have the same or less qualifiers as the old type. 10442 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10443 Diag(New->getLocation(), 10444 diag::err_covariant_return_type_class_type_more_qualified) 10445 << New->getDeclName() << NewTy << OldTy; 10446 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10447 return true; 10448 }; 10449 10450 return false; 10451} 10452 10453/// \brief Mark the given method pure. 10454/// 10455/// \param Method the method to be marked pure. 10456/// 10457/// \param InitRange the source range that covers the "0" initializer. 10458bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10459 SourceLocation EndLoc = InitRange.getEnd(); 10460 if (EndLoc.isValid()) 10461 Method->setRangeEnd(EndLoc); 10462 10463 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10464 Method->setPure(); 10465 return false; 10466 } 10467 10468 if (!Method->isInvalidDecl()) 10469 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10470 << Method->getDeclName() << InitRange; 10471 return true; 10472} 10473 10474/// \brief Determine whether the given declaration is a static data member. 10475static bool isStaticDataMember(Decl *D) { 10476 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10477 if (!Var) 10478 return false; 10479 10480 return Var->isStaticDataMember(); 10481} 10482/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10483/// an initializer for the out-of-line declaration 'Dcl'. The scope 10484/// is a fresh scope pushed for just this purpose. 10485/// 10486/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10487/// static data member of class X, names should be looked up in the scope of 10488/// class X. 10489void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10490 // If there is no declaration, there was an error parsing it. 10491 if (D == 0 || D->isInvalidDecl()) return; 10492 10493 // We should only get called for declarations with scope specifiers, like: 10494 // int foo::bar; 10495 assert(D->isOutOfLine()); 10496 EnterDeclaratorContext(S, D->getDeclContext()); 10497 10498 // If we are parsing the initializer for a static data member, push a 10499 // new expression evaluation context that is associated with this static 10500 // data member. 10501 if (isStaticDataMember(D)) 10502 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10503} 10504 10505/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10506/// initializer for the out-of-line declaration 'D'. 10507void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10508 // If there is no declaration, there was an error parsing it. 10509 if (D == 0 || D->isInvalidDecl()) return; 10510 10511 if (isStaticDataMember(D)) 10512 PopExpressionEvaluationContext(); 10513 10514 assert(D->isOutOfLine()); 10515 ExitDeclaratorContext(S); 10516} 10517 10518/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10519/// C++ if/switch/while/for statement. 10520/// e.g: "if (int x = f()) {...}" 10521DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10522 // C++ 6.4p2: 10523 // The declarator shall not specify a function or an array. 10524 // The type-specifier-seq shall not contain typedef and shall not declare a 10525 // new class or enumeration. 10526 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10527 "Parser allowed 'typedef' as storage class of condition decl."); 10528 10529 Decl *Dcl = ActOnDeclarator(S, D); 10530 if (!Dcl) 10531 return true; 10532 10533 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10534 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10535 << D.getSourceRange(); 10536 return true; 10537 } 10538 10539 return Dcl; 10540} 10541 10542void Sema::LoadExternalVTableUses() { 10543 if (!ExternalSource) 10544 return; 10545 10546 SmallVector<ExternalVTableUse, 4> VTables; 10547 ExternalSource->ReadUsedVTables(VTables); 10548 SmallVector<VTableUse, 4> NewUses; 10549 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10550 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10551 = VTablesUsed.find(VTables[I].Record); 10552 // Even if a definition wasn't required before, it may be required now. 10553 if (Pos != VTablesUsed.end()) { 10554 if (!Pos->second && VTables[I].DefinitionRequired) 10555 Pos->second = true; 10556 continue; 10557 } 10558 10559 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10560 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10561 } 10562 10563 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10564} 10565 10566void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10567 bool DefinitionRequired) { 10568 // Ignore any vtable uses in unevaluated operands or for classes that do 10569 // not have a vtable. 10570 if (!Class->isDynamicClass() || Class->isDependentContext() || 10571 CurContext->isDependentContext() || 10572 ExprEvalContexts.back().Context == Unevaluated) 10573 return; 10574 10575 // Try to insert this class into the map. 10576 LoadExternalVTableUses(); 10577 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10578 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10579 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10580 if (!Pos.second) { 10581 // If we already had an entry, check to see if we are promoting this vtable 10582 // to required a definition. If so, we need to reappend to the VTableUses 10583 // list, since we may have already processed the first entry. 10584 if (DefinitionRequired && !Pos.first->second) { 10585 Pos.first->second = true; 10586 } else { 10587 // Otherwise, we can early exit. 10588 return; 10589 } 10590 } 10591 10592 // Local classes need to have their virtual members marked 10593 // immediately. For all other classes, we mark their virtual members 10594 // at the end of the translation unit. 10595 if (Class->isLocalClass()) 10596 MarkVirtualMembersReferenced(Loc, Class); 10597 else 10598 VTableUses.push_back(std::make_pair(Class, Loc)); 10599} 10600 10601bool Sema::DefineUsedVTables() { 10602 LoadExternalVTableUses(); 10603 if (VTableUses.empty()) 10604 return false; 10605 10606 // Note: The VTableUses vector could grow as a result of marking 10607 // the members of a class as "used", so we check the size each 10608 // time through the loop and prefer indices (with are stable) to 10609 // iterators (which are not). 10610 bool DefinedAnything = false; 10611 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10612 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10613 if (!Class) 10614 continue; 10615 10616 SourceLocation Loc = VTableUses[I].second; 10617 10618 // If this class has a key function, but that key function is 10619 // defined in another translation unit, we don't need to emit the 10620 // vtable even though we're using it. 10621 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10622 if (KeyFunction && !KeyFunction->hasBody()) { 10623 switch (KeyFunction->getTemplateSpecializationKind()) { 10624 case TSK_Undeclared: 10625 case TSK_ExplicitSpecialization: 10626 case TSK_ExplicitInstantiationDeclaration: 10627 // The key function is in another translation unit. 10628 continue; 10629 10630 case TSK_ExplicitInstantiationDefinition: 10631 case TSK_ImplicitInstantiation: 10632 // We will be instantiating the key function. 10633 break; 10634 } 10635 } else if (!KeyFunction) { 10636 // If we have a class with no key function that is the subject 10637 // of an explicit instantiation declaration, suppress the 10638 // vtable; it will live with the explicit instantiation 10639 // definition. 10640 bool IsExplicitInstantiationDeclaration 10641 = Class->getTemplateSpecializationKind() 10642 == TSK_ExplicitInstantiationDeclaration; 10643 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10644 REnd = Class->redecls_end(); 10645 R != REnd; ++R) { 10646 TemplateSpecializationKind TSK 10647 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10648 if (TSK == TSK_ExplicitInstantiationDeclaration) 10649 IsExplicitInstantiationDeclaration = true; 10650 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10651 IsExplicitInstantiationDeclaration = false; 10652 break; 10653 } 10654 } 10655 10656 if (IsExplicitInstantiationDeclaration) 10657 continue; 10658 } 10659 10660 // Mark all of the virtual members of this class as referenced, so 10661 // that we can build a vtable. Then, tell the AST consumer that a 10662 // vtable for this class is required. 10663 DefinedAnything = true; 10664 MarkVirtualMembersReferenced(Loc, Class); 10665 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10666 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10667 10668 // Optionally warn if we're emitting a weak vtable. 10669 if (Class->getLinkage() == ExternalLinkage && 10670 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10671 const FunctionDecl *KeyFunctionDef = 0; 10672 if (!KeyFunction || 10673 (KeyFunction->hasBody(KeyFunctionDef) && 10674 KeyFunctionDef->isInlined())) 10675 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10676 TSK_ExplicitInstantiationDefinition 10677 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10678 << Class; 10679 } 10680 } 10681 VTableUses.clear(); 10682 10683 return DefinedAnything; 10684} 10685 10686void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10687 const CXXRecordDecl *RD) { 10688 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10689 e = RD->method_end(); i != e; ++i) { 10690 CXXMethodDecl *MD = *i; 10691 10692 // C++ [basic.def.odr]p2: 10693 // [...] A virtual member function is used if it is not pure. [...] 10694 if (MD->isVirtual() && !MD->isPure()) 10695 MarkFunctionReferenced(Loc, MD); 10696 } 10697 10698 // Only classes that have virtual bases need a VTT. 10699 if (RD->getNumVBases() == 0) 10700 return; 10701 10702 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10703 e = RD->bases_end(); i != e; ++i) { 10704 const CXXRecordDecl *Base = 10705 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10706 if (Base->getNumVBases() == 0) 10707 continue; 10708 MarkVirtualMembersReferenced(Loc, Base); 10709 } 10710} 10711 10712/// SetIvarInitializers - This routine builds initialization ASTs for the 10713/// Objective-C implementation whose ivars need be initialized. 10714void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10715 if (!getLangOptions().CPlusPlus) 10716 return; 10717 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10718 SmallVector<ObjCIvarDecl*, 8> ivars; 10719 CollectIvarsToConstructOrDestruct(OID, ivars); 10720 if (ivars.empty()) 10721 return; 10722 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10723 for (unsigned i = 0; i < ivars.size(); i++) { 10724 FieldDecl *Field = ivars[i]; 10725 if (Field->isInvalidDecl()) 10726 continue; 10727 10728 CXXCtorInitializer *Member; 10729 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10730 InitializationKind InitKind = 10731 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10732 10733 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10734 ExprResult MemberInit = 10735 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10736 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10737 // Note, MemberInit could actually come back empty if no initialization 10738 // is required (e.g., because it would call a trivial default constructor) 10739 if (!MemberInit.get() || MemberInit.isInvalid()) 10740 continue; 10741 10742 Member = 10743 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10744 SourceLocation(), 10745 MemberInit.takeAs<Expr>(), 10746 SourceLocation()); 10747 AllToInit.push_back(Member); 10748 10749 // Be sure that the destructor is accessible and is marked as referenced. 10750 if (const RecordType *RecordTy 10751 = Context.getBaseElementType(Field->getType()) 10752 ->getAs<RecordType>()) { 10753 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10754 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10755 MarkFunctionReferenced(Field->getLocation(), Destructor); 10756 CheckDestructorAccess(Field->getLocation(), Destructor, 10757 PDiag(diag::err_access_dtor_ivar) 10758 << Context.getBaseElementType(Field->getType())); 10759 } 10760 } 10761 } 10762 ObjCImplementation->setIvarInitializers(Context, 10763 AllToInit.data(), AllToInit.size()); 10764 } 10765} 10766 10767static 10768void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10769 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10770 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10771 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10772 Sema &S) { 10773 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10774 CE = Current.end(); 10775 if (Ctor->isInvalidDecl()) 10776 return; 10777 10778 const FunctionDecl *FNTarget = 0; 10779 CXXConstructorDecl *Target; 10780 10781 // We ignore the result here since if we don't have a body, Target will be 10782 // null below. 10783 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10784 Target 10785= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10786 10787 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10788 // Avoid dereferencing a null pointer here. 10789 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10790 10791 if (!Current.insert(Canonical)) 10792 return; 10793 10794 // We know that beyond here, we aren't chaining into a cycle. 10795 if (!Target || !Target->isDelegatingConstructor() || 10796 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10797 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10798 Valid.insert(*CI); 10799 Current.clear(); 10800 // We've hit a cycle. 10801 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10802 Current.count(TCanonical)) { 10803 // If we haven't diagnosed this cycle yet, do so now. 10804 if (!Invalid.count(TCanonical)) { 10805 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10806 diag::warn_delegating_ctor_cycle) 10807 << Ctor; 10808 10809 // Don't add a note for a function delegating directo to itself. 10810 if (TCanonical != Canonical) 10811 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10812 10813 CXXConstructorDecl *C = Target; 10814 while (C->getCanonicalDecl() != Canonical) { 10815 (void)C->getTargetConstructor()->hasBody(FNTarget); 10816 assert(FNTarget && "Ctor cycle through bodiless function"); 10817 10818 C 10819 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10820 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10821 } 10822 } 10823 10824 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10825 Invalid.insert(*CI); 10826 Current.clear(); 10827 } else { 10828 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10829 } 10830} 10831 10832 10833void Sema::CheckDelegatingCtorCycles() { 10834 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10835 10836 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10837 CE = Current.end(); 10838 10839 for (DelegatingCtorDeclsType::iterator 10840 I = DelegatingCtorDecls.begin(ExternalSource), 10841 E = DelegatingCtorDecls.end(); 10842 I != E; ++I) { 10843 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10844 } 10845 10846 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10847 (*CI)->setInvalidDecl(); 10848} 10849 10850/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10851Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10852 // Implicitly declared functions (e.g. copy constructors) are 10853 // __host__ __device__ 10854 if (D->isImplicit()) 10855 return CFT_HostDevice; 10856 10857 if (D->hasAttr<CUDAGlobalAttr>()) 10858 return CFT_Global; 10859 10860 if (D->hasAttr<CUDADeviceAttr>()) { 10861 if (D->hasAttr<CUDAHostAttr>()) 10862 return CFT_HostDevice; 10863 else 10864 return CFT_Device; 10865 } 10866 10867 return CFT_Host; 10868} 10869 10870bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10871 CUDAFunctionTarget CalleeTarget) { 10872 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10873 // Callable from the device only." 10874 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10875 return true; 10876 10877 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10878 // Callable from the host only." 10879 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10880 // Callable from the host only." 10881 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10882 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 10883 return true; 10884 10885 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 10886 return true; 10887 10888 return false; 10889} 10890