SemaDeclCXX.cpp revision 79363f5e612c17cd05e1fa888632ee7860ced1ab
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 // The destructor for an implicit anonymous union member is never invoked. 3297 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3298 continue; 3299 3300 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3301 assert(Dtor && "No dtor found for FieldClassDecl!"); 3302 CheckDestructorAccess(Field->getLocation(), Dtor, 3303 PDiag(diag::err_access_dtor_field) 3304 << Field->getDeclName() 3305 << FieldType); 3306 3307 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3308 DiagnoseUseOfDecl(Dtor, Location); 3309 } 3310 3311 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3312 3313 // Bases. 3314 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3315 E = ClassDecl->bases_end(); Base != E; ++Base) { 3316 // Bases are always records in a well-formed non-dependent class. 3317 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3318 3319 // Remember direct virtual bases. 3320 if (Base->isVirtual()) 3321 DirectVirtualBases.insert(RT); 3322 3323 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3324 // If our base class is invalid, we probably can't get its dtor anyway. 3325 if (BaseClassDecl->isInvalidDecl()) 3326 continue; 3327 if (BaseClassDecl->hasIrrelevantDestructor()) 3328 continue; 3329 3330 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3331 assert(Dtor && "No dtor found for BaseClassDecl!"); 3332 3333 // FIXME: caret should be on the start of the class name 3334 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3335 PDiag(diag::err_access_dtor_base) 3336 << Base->getType() 3337 << Base->getSourceRange()); 3338 3339 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3340 DiagnoseUseOfDecl(Dtor, Location); 3341 } 3342 3343 // Virtual bases. 3344 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3345 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3346 3347 // Bases are always records in a well-formed non-dependent class. 3348 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3349 3350 // Ignore direct virtual bases. 3351 if (DirectVirtualBases.count(RT)) 3352 continue; 3353 3354 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3355 // If our base class is invalid, we probably can't get its dtor anyway. 3356 if (BaseClassDecl->isInvalidDecl()) 3357 continue; 3358 if (BaseClassDecl->hasIrrelevantDestructor()) 3359 continue; 3360 3361 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3362 assert(Dtor && "No dtor found for BaseClassDecl!"); 3363 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3364 PDiag(diag::err_access_dtor_vbase) 3365 << VBase->getType()); 3366 3367 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3368 DiagnoseUseOfDecl(Dtor, Location); 3369 } 3370} 3371 3372void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3373 if (!CDtorDecl) 3374 return; 3375 3376 if (CXXConstructorDecl *Constructor 3377 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3378 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3379} 3380 3381bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3382 unsigned DiagID, AbstractDiagSelID SelID) { 3383 if (SelID == -1) 3384 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3385 else 3386 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3387} 3388 3389bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3390 const PartialDiagnostic &PD) { 3391 if (!getLangOptions().CPlusPlus) 3392 return false; 3393 3394 if (const ArrayType *AT = Context.getAsArrayType(T)) 3395 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3396 3397 if (const PointerType *PT = T->getAs<PointerType>()) { 3398 // Find the innermost pointer type. 3399 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3400 PT = T; 3401 3402 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3403 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3404 } 3405 3406 const RecordType *RT = T->getAs<RecordType>(); 3407 if (!RT) 3408 return false; 3409 3410 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3411 3412 // We can't answer whether something is abstract until it has a 3413 // definition. If it's currently being defined, we'll walk back 3414 // over all the declarations when we have a full definition. 3415 const CXXRecordDecl *Def = RD->getDefinition(); 3416 if (!Def || Def->isBeingDefined()) 3417 return false; 3418 3419 if (!RD->isAbstract()) 3420 return false; 3421 3422 Diag(Loc, PD) << RD->getDeclName(); 3423 DiagnoseAbstractType(RD); 3424 3425 return true; 3426} 3427 3428void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3429 // Check if we've already emitted the list of pure virtual functions 3430 // for this class. 3431 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3432 return; 3433 3434 CXXFinalOverriderMap FinalOverriders; 3435 RD->getFinalOverriders(FinalOverriders); 3436 3437 // Keep a set of seen pure methods so we won't diagnose the same method 3438 // more than once. 3439 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3440 3441 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3442 MEnd = FinalOverriders.end(); 3443 M != MEnd; 3444 ++M) { 3445 for (OverridingMethods::iterator SO = M->second.begin(), 3446 SOEnd = M->second.end(); 3447 SO != SOEnd; ++SO) { 3448 // C++ [class.abstract]p4: 3449 // A class is abstract if it contains or inherits at least one 3450 // pure virtual function for which the final overrider is pure 3451 // virtual. 3452 3453 // 3454 if (SO->second.size() != 1) 3455 continue; 3456 3457 if (!SO->second.front().Method->isPure()) 3458 continue; 3459 3460 if (!SeenPureMethods.insert(SO->second.front().Method)) 3461 continue; 3462 3463 Diag(SO->second.front().Method->getLocation(), 3464 diag::note_pure_virtual_function) 3465 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3466 } 3467 } 3468 3469 if (!PureVirtualClassDiagSet) 3470 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3471 PureVirtualClassDiagSet->insert(RD); 3472} 3473 3474namespace { 3475struct AbstractUsageInfo { 3476 Sema &S; 3477 CXXRecordDecl *Record; 3478 CanQualType AbstractType; 3479 bool Invalid; 3480 3481 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3482 : S(S), Record(Record), 3483 AbstractType(S.Context.getCanonicalType( 3484 S.Context.getTypeDeclType(Record))), 3485 Invalid(false) {} 3486 3487 void DiagnoseAbstractType() { 3488 if (Invalid) return; 3489 S.DiagnoseAbstractType(Record); 3490 Invalid = true; 3491 } 3492 3493 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3494}; 3495 3496struct CheckAbstractUsage { 3497 AbstractUsageInfo &Info; 3498 const NamedDecl *Ctx; 3499 3500 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3501 : Info(Info), Ctx(Ctx) {} 3502 3503 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3504 switch (TL.getTypeLocClass()) { 3505#define ABSTRACT_TYPELOC(CLASS, PARENT) 3506#define TYPELOC(CLASS, PARENT) \ 3507 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3508#include "clang/AST/TypeLocNodes.def" 3509 } 3510 } 3511 3512 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3513 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3514 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3515 if (!TL.getArg(I)) 3516 continue; 3517 3518 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3519 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3520 } 3521 } 3522 3523 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3524 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3525 } 3526 3527 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3528 // Visit the type parameters from a permissive context. 3529 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3530 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3531 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3532 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3533 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3534 // TODO: other template argument types? 3535 } 3536 } 3537 3538 // Visit pointee types from a permissive context. 3539#define CheckPolymorphic(Type) \ 3540 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3541 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3542 } 3543 CheckPolymorphic(PointerTypeLoc) 3544 CheckPolymorphic(ReferenceTypeLoc) 3545 CheckPolymorphic(MemberPointerTypeLoc) 3546 CheckPolymorphic(BlockPointerTypeLoc) 3547 CheckPolymorphic(AtomicTypeLoc) 3548 3549 /// Handle all the types we haven't given a more specific 3550 /// implementation for above. 3551 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3552 // Every other kind of type that we haven't called out already 3553 // that has an inner type is either (1) sugar or (2) contains that 3554 // inner type in some way as a subobject. 3555 if (TypeLoc Next = TL.getNextTypeLoc()) 3556 return Visit(Next, Sel); 3557 3558 // If there's no inner type and we're in a permissive context, 3559 // don't diagnose. 3560 if (Sel == Sema::AbstractNone) return; 3561 3562 // Check whether the type matches the abstract type. 3563 QualType T = TL.getType(); 3564 if (T->isArrayType()) { 3565 Sel = Sema::AbstractArrayType; 3566 T = Info.S.Context.getBaseElementType(T); 3567 } 3568 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3569 if (CT != Info.AbstractType) return; 3570 3571 // It matched; do some magic. 3572 if (Sel == Sema::AbstractArrayType) { 3573 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3574 << T << TL.getSourceRange(); 3575 } else { 3576 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3577 << Sel << T << TL.getSourceRange(); 3578 } 3579 Info.DiagnoseAbstractType(); 3580 } 3581}; 3582 3583void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3584 Sema::AbstractDiagSelID Sel) { 3585 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3586} 3587 3588} 3589 3590/// Check for invalid uses of an abstract type in a method declaration. 3591static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3592 CXXMethodDecl *MD) { 3593 // No need to do the check on definitions, which require that 3594 // the return/param types be complete. 3595 if (MD->doesThisDeclarationHaveABody()) 3596 return; 3597 3598 // For safety's sake, just ignore it if we don't have type source 3599 // information. This should never happen for non-implicit methods, 3600 // but... 3601 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3602 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3603} 3604 3605/// Check for invalid uses of an abstract type within a class definition. 3606static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3607 CXXRecordDecl *RD) { 3608 for (CXXRecordDecl::decl_iterator 3609 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3610 Decl *D = *I; 3611 if (D->isImplicit()) continue; 3612 3613 // Methods and method templates. 3614 if (isa<CXXMethodDecl>(D)) { 3615 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3616 } else if (isa<FunctionTemplateDecl>(D)) { 3617 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3618 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3619 3620 // Fields and static variables. 3621 } else if (isa<FieldDecl>(D)) { 3622 FieldDecl *FD = cast<FieldDecl>(D); 3623 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3624 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3625 } else if (isa<VarDecl>(D)) { 3626 VarDecl *VD = cast<VarDecl>(D); 3627 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3628 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3629 3630 // Nested classes and class templates. 3631 } else if (isa<CXXRecordDecl>(D)) { 3632 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3633 } else if (isa<ClassTemplateDecl>(D)) { 3634 CheckAbstractClassUsage(Info, 3635 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3636 } 3637 } 3638} 3639 3640/// \brief Perform semantic checks on a class definition that has been 3641/// completing, introducing implicitly-declared members, checking for 3642/// abstract types, etc. 3643void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3644 if (!Record) 3645 return; 3646 3647 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3648 AbstractUsageInfo Info(*this, Record); 3649 CheckAbstractClassUsage(Info, Record); 3650 } 3651 3652 // If this is not an aggregate type and has no user-declared constructor, 3653 // complain about any non-static data members of reference or const scalar 3654 // type, since they will never get initializers. 3655 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3656 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3657 !Record->isLambda()) { 3658 bool Complained = false; 3659 for (RecordDecl::field_iterator F = Record->field_begin(), 3660 FEnd = Record->field_end(); 3661 F != FEnd; ++F) { 3662 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3663 continue; 3664 3665 if (F->getType()->isReferenceType() || 3666 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3667 if (!Complained) { 3668 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3669 << Record->getTagKind() << Record; 3670 Complained = true; 3671 } 3672 3673 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3674 << F->getType()->isReferenceType() 3675 << F->getDeclName(); 3676 } 3677 } 3678 } 3679 3680 if (Record->isDynamicClass() && !Record->isDependentType()) 3681 DynamicClasses.push_back(Record); 3682 3683 if (Record->getIdentifier()) { 3684 // C++ [class.mem]p13: 3685 // If T is the name of a class, then each of the following shall have a 3686 // name different from T: 3687 // - every member of every anonymous union that is a member of class T. 3688 // 3689 // C++ [class.mem]p14: 3690 // In addition, if class T has a user-declared constructor (12.1), every 3691 // non-static data member of class T shall have a name different from T. 3692 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3693 R.first != R.second; ++R.first) { 3694 NamedDecl *D = *R.first; 3695 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3696 isa<IndirectFieldDecl>(D)) { 3697 Diag(D->getLocation(), diag::err_member_name_of_class) 3698 << D->getDeclName(); 3699 break; 3700 } 3701 } 3702 } 3703 3704 // Warn if the class has virtual methods but non-virtual public destructor. 3705 if (Record->isPolymorphic() && !Record->isDependentType()) { 3706 CXXDestructorDecl *dtor = Record->getDestructor(); 3707 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3708 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3709 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3710 } 3711 3712 // See if a method overloads virtual methods in a base 3713 /// class without overriding any. 3714 if (!Record->isDependentType()) { 3715 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3716 MEnd = Record->method_end(); 3717 M != MEnd; ++M) { 3718 if (!(*M)->isStatic()) 3719 DiagnoseHiddenVirtualMethods(Record, *M); 3720 } 3721 } 3722 3723 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3724 // function that is not a constructor declares that member function to be 3725 // const. [...] The class of which that function is a member shall be 3726 // a literal type. 3727 // 3728 // If the class has virtual bases, any constexpr members will already have 3729 // been diagnosed by the checks performed on the member declaration, so 3730 // suppress this (less useful) diagnostic. 3731 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3732 !Record->isLiteral() && !Record->getNumVBases()) { 3733 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3734 MEnd = Record->method_end(); 3735 M != MEnd; ++M) { 3736 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3737 switch (Record->getTemplateSpecializationKind()) { 3738 case TSK_ImplicitInstantiation: 3739 case TSK_ExplicitInstantiationDeclaration: 3740 case TSK_ExplicitInstantiationDefinition: 3741 // If a template instantiates to a non-literal type, but its members 3742 // instantiate to constexpr functions, the template is technically 3743 // ill-formed, but we allow it for sanity. 3744 continue; 3745 3746 case TSK_Undeclared: 3747 case TSK_ExplicitSpecialization: 3748 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3749 PDiag(diag::err_constexpr_method_non_literal)); 3750 break; 3751 } 3752 3753 // Only produce one error per class. 3754 break; 3755 } 3756 } 3757 } 3758 3759 // Declare inherited constructors. We do this eagerly here because: 3760 // - The standard requires an eager diagnostic for conflicting inherited 3761 // constructors from different classes. 3762 // - The lazy declaration of the other implicit constructors is so as to not 3763 // waste space and performance on classes that are not meant to be 3764 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3765 // have inherited constructors. 3766 DeclareInheritedConstructors(Record); 3767 3768 if (!Record->isDependentType()) 3769 CheckExplicitlyDefaultedMethods(Record); 3770} 3771 3772void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3773 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3774 ME = Record->method_end(); 3775 MI != ME; ++MI) { 3776 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3777 switch (getSpecialMember(*MI)) { 3778 case CXXDefaultConstructor: 3779 CheckExplicitlyDefaultedDefaultConstructor( 3780 cast<CXXConstructorDecl>(*MI)); 3781 break; 3782 3783 case CXXDestructor: 3784 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3785 break; 3786 3787 case CXXCopyConstructor: 3788 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3789 break; 3790 3791 case CXXCopyAssignment: 3792 CheckExplicitlyDefaultedCopyAssignment(*MI); 3793 break; 3794 3795 case CXXMoveConstructor: 3796 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3797 break; 3798 3799 case CXXMoveAssignment: 3800 CheckExplicitlyDefaultedMoveAssignment(*MI); 3801 break; 3802 3803 case CXXInvalid: 3804 llvm_unreachable("non-special member explicitly defaulted!"); 3805 } 3806 } 3807 } 3808 3809} 3810 3811void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3812 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3813 3814 // Whether this was the first-declared instance of the constructor. 3815 // This affects whether we implicitly add an exception spec (and, eventually, 3816 // constexpr). It is also ill-formed to explicitly default a constructor such 3817 // that it would be deleted. (C++0x [decl.fct.def.default]) 3818 bool First = CD == CD->getCanonicalDecl(); 3819 3820 bool HadError = false; 3821 if (CD->getNumParams() != 0) { 3822 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3823 << CD->getSourceRange(); 3824 HadError = true; 3825 } 3826 3827 ImplicitExceptionSpecification Spec 3828 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3829 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3830 if (EPI.ExceptionSpecType == EST_Delayed) { 3831 // Exception specification depends on some deferred part of the class. We'll 3832 // try again when the class's definition has been fully processed. 3833 return; 3834 } 3835 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3836 *ExceptionType = Context.getFunctionType( 3837 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3838 3839 // C++11 [dcl.fct.def.default]p2: 3840 // An explicitly-defaulted function may be declared constexpr only if it 3841 // would have been implicitly declared as constexpr, 3842 // Do not apply this rule to templates, since core issue 1358 makes such 3843 // functions always instantiate to constexpr functions. 3844 if (CD->isConstexpr() && 3845 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3846 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3847 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3848 << CXXDefaultConstructor; 3849 HadError = true; 3850 } 3851 } 3852 // and may have an explicit exception-specification only if it is compatible 3853 // with the exception-specification on the implicit declaration. 3854 if (CtorType->hasExceptionSpec()) { 3855 if (CheckEquivalentExceptionSpec( 3856 PDiag(diag::err_incorrect_defaulted_exception_spec) 3857 << CXXDefaultConstructor, 3858 PDiag(), 3859 ExceptionType, SourceLocation(), 3860 CtorType, CD->getLocation())) { 3861 HadError = true; 3862 } 3863 } 3864 3865 // If a function is explicitly defaulted on its first declaration, 3866 if (First) { 3867 // -- it is implicitly considered to be constexpr if the implicit 3868 // definition would be, 3869 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3870 3871 // -- it is implicitly considered to have the same 3872 // exception-specification as if it had been implicitly declared 3873 // 3874 // FIXME: a compatible, but different, explicit exception specification 3875 // will be silently overridden. We should issue a warning if this happens. 3876 EPI.ExtInfo = CtorType->getExtInfo(); 3877 3878 // Such a function is also trivial if the implicitly-declared function 3879 // would have been. 3880 CD->setTrivial(CD->getParent()->hasTrivialDefaultConstructor()); 3881 } 3882 3883 if (HadError) { 3884 CD->setInvalidDecl(); 3885 return; 3886 } 3887 3888 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3889 if (First) { 3890 CD->setDeletedAsWritten(); 3891 } else { 3892 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3893 << CXXDefaultConstructor; 3894 CD->setInvalidDecl(); 3895 } 3896 } 3897} 3898 3899void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3900 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3901 3902 // Whether this was the first-declared instance of the constructor. 3903 bool First = CD == CD->getCanonicalDecl(); 3904 3905 bool HadError = false; 3906 if (CD->getNumParams() != 1) { 3907 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3908 << CD->getSourceRange(); 3909 HadError = true; 3910 } 3911 3912 ImplicitExceptionSpecification Spec(Context); 3913 bool Const; 3914 llvm::tie(Spec, Const) = 3915 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3916 3917 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3918 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3919 *ExceptionType = Context.getFunctionType( 3920 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3921 3922 // Check for parameter type matching. 3923 // This is a copy ctor so we know it's a cv-qualified reference to T. 3924 QualType ArgType = CtorType->getArgType(0); 3925 if (ArgType->getPointeeType().isVolatileQualified()) { 3926 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3927 HadError = true; 3928 } 3929 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3930 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3931 HadError = true; 3932 } 3933 3934 // C++11 [dcl.fct.def.default]p2: 3935 // An explicitly-defaulted function may be declared constexpr only if it 3936 // would have been implicitly declared as constexpr, 3937 // Do not apply this rule to templates, since core issue 1358 makes such 3938 // functions always instantiate to constexpr functions. 3939 if (CD->isConstexpr() && 3940 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3941 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3942 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3943 << CXXCopyConstructor; 3944 HadError = true; 3945 } 3946 } 3947 // and may have an explicit exception-specification only if it is compatible 3948 // with the exception-specification on the implicit declaration. 3949 if (CtorType->hasExceptionSpec()) { 3950 if (CheckEquivalentExceptionSpec( 3951 PDiag(diag::err_incorrect_defaulted_exception_spec) 3952 << CXXCopyConstructor, 3953 PDiag(), 3954 ExceptionType, SourceLocation(), 3955 CtorType, CD->getLocation())) { 3956 HadError = true; 3957 } 3958 } 3959 3960 // If a function is explicitly defaulted on its first declaration, 3961 if (First) { 3962 // -- it is implicitly considered to be constexpr if the implicit 3963 // definition would be, 3964 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3965 3966 // -- it is implicitly considered to have the same 3967 // exception-specification as if it had been implicitly declared, and 3968 // 3969 // FIXME: a compatible, but different, explicit exception specification 3970 // will be silently overridden. We should issue a warning if this happens. 3971 EPI.ExtInfo = CtorType->getExtInfo(); 3972 3973 // -- [...] it shall have the same parameter type as if it had been 3974 // implicitly declared. 3975 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3976 3977 // Such a function is also trivial if the implicitly-declared function 3978 // would have been. 3979 CD->setTrivial(CD->getParent()->hasTrivialCopyConstructor()); 3980 } 3981 3982 if (HadError) { 3983 CD->setInvalidDecl(); 3984 return; 3985 } 3986 3987 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3988 if (First) { 3989 CD->setDeletedAsWritten(); 3990 } else { 3991 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3992 << CXXCopyConstructor; 3993 CD->setInvalidDecl(); 3994 } 3995 } 3996} 3997 3998void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3999 assert(MD->isExplicitlyDefaulted()); 4000 4001 // Whether this was the first-declared instance of the operator 4002 bool First = MD == MD->getCanonicalDecl(); 4003 4004 bool HadError = false; 4005 if (MD->getNumParams() != 1) { 4006 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 4007 << MD->getSourceRange(); 4008 HadError = true; 4009 } 4010 4011 QualType ReturnType = 4012 MD->getType()->getAs<FunctionType>()->getResultType(); 4013 if (!ReturnType->isLValueReferenceType() || 4014 !Context.hasSameType( 4015 Context.getCanonicalType(ReturnType->getPointeeType()), 4016 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4017 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 4018 HadError = true; 4019 } 4020 4021 ImplicitExceptionSpecification Spec(Context); 4022 bool Const; 4023 llvm::tie(Spec, Const) = 4024 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 4025 4026 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4027 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4028 *ExceptionType = Context.getFunctionType( 4029 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4030 4031 QualType ArgType = OperType->getArgType(0); 4032 if (!ArgType->isLValueReferenceType()) { 4033 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4034 HadError = true; 4035 } else { 4036 if (ArgType->getPointeeType().isVolatileQualified()) { 4037 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 4038 HadError = true; 4039 } 4040 if (ArgType->getPointeeType().isConstQualified() && !Const) { 4041 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 4042 HadError = true; 4043 } 4044 } 4045 4046 if (OperType->getTypeQuals()) { 4047 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 4048 HadError = true; 4049 } 4050 4051 if (OperType->hasExceptionSpec()) { 4052 if (CheckEquivalentExceptionSpec( 4053 PDiag(diag::err_incorrect_defaulted_exception_spec) 4054 << CXXCopyAssignment, 4055 PDiag(), 4056 ExceptionType, SourceLocation(), 4057 OperType, MD->getLocation())) { 4058 HadError = true; 4059 } 4060 } 4061 if (First) { 4062 // We set the declaration to have the computed exception spec here. 4063 // We duplicate the one parameter type. 4064 EPI.RefQualifier = OperType->getRefQualifier(); 4065 EPI.ExtInfo = OperType->getExtInfo(); 4066 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4067 4068 // Such a function is also trivial if the implicitly-declared function 4069 // would have been. 4070 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 4071 } 4072 4073 if (HadError) { 4074 MD->setInvalidDecl(); 4075 return; 4076 } 4077 4078 if (ShouldDeleteSpecialMember(MD, CXXCopyAssignment)) { 4079 if (First) { 4080 MD->setDeletedAsWritten(); 4081 } else { 4082 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4083 << CXXCopyAssignment; 4084 MD->setInvalidDecl(); 4085 } 4086 } 4087} 4088 4089void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 4090 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 4091 4092 // Whether this was the first-declared instance of the constructor. 4093 bool First = CD == CD->getCanonicalDecl(); 4094 4095 bool HadError = false; 4096 if (CD->getNumParams() != 1) { 4097 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4098 << CD->getSourceRange(); 4099 HadError = true; 4100 } 4101 4102 ImplicitExceptionSpecification Spec( 4103 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4104 4105 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4106 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4107 *ExceptionType = Context.getFunctionType( 4108 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4109 4110 // Check for parameter type matching. 4111 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4112 QualType ArgType = CtorType->getArgType(0); 4113 if (ArgType->getPointeeType().isVolatileQualified()) { 4114 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4115 HadError = true; 4116 } 4117 if (ArgType->getPointeeType().isConstQualified()) { 4118 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4119 HadError = true; 4120 } 4121 4122 // C++11 [dcl.fct.def.default]p2: 4123 // An explicitly-defaulted function may be declared constexpr only if it 4124 // would have been implicitly declared as constexpr, 4125 // Do not apply this rule to templates, since core issue 1358 makes such 4126 // functions always instantiate to constexpr functions. 4127 if (CD->isConstexpr() && 4128 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4129 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4130 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4131 << CXXMoveConstructor; 4132 HadError = true; 4133 } 4134 } 4135 // and may have an explicit exception-specification only if it is compatible 4136 // with the exception-specification on the implicit declaration. 4137 if (CtorType->hasExceptionSpec()) { 4138 if (CheckEquivalentExceptionSpec( 4139 PDiag(diag::err_incorrect_defaulted_exception_spec) 4140 << CXXMoveConstructor, 4141 PDiag(), 4142 ExceptionType, SourceLocation(), 4143 CtorType, CD->getLocation())) { 4144 HadError = true; 4145 } 4146 } 4147 4148 // If a function is explicitly defaulted on its first declaration, 4149 if (First) { 4150 // -- it is implicitly considered to be constexpr if the implicit 4151 // definition would be, 4152 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4153 4154 // -- it is implicitly considered to have the same 4155 // exception-specification as if it had been implicitly declared, and 4156 // 4157 // FIXME: a compatible, but different, explicit exception specification 4158 // will be silently overridden. We should issue a warning if this happens. 4159 EPI.ExtInfo = CtorType->getExtInfo(); 4160 4161 // -- [...] it shall have the same parameter type as if it had been 4162 // implicitly declared. 4163 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4164 4165 // Such a function is also trivial if the implicitly-declared function 4166 // would have been. 4167 CD->setTrivial(CD->getParent()->hasTrivialMoveConstructor()); 4168 } 4169 4170 if (HadError) { 4171 CD->setInvalidDecl(); 4172 return; 4173 } 4174 4175 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4176 if (First) { 4177 CD->setDeletedAsWritten(); 4178 } else { 4179 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4180 << CXXMoveConstructor; 4181 CD->setInvalidDecl(); 4182 } 4183 } 4184} 4185 4186void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4187 assert(MD->isExplicitlyDefaulted()); 4188 4189 // Whether this was the first-declared instance of the operator 4190 bool First = MD == MD->getCanonicalDecl(); 4191 4192 bool HadError = false; 4193 if (MD->getNumParams() != 1) { 4194 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4195 << MD->getSourceRange(); 4196 HadError = true; 4197 } 4198 4199 QualType ReturnType = 4200 MD->getType()->getAs<FunctionType>()->getResultType(); 4201 if (!ReturnType->isLValueReferenceType() || 4202 !Context.hasSameType( 4203 Context.getCanonicalType(ReturnType->getPointeeType()), 4204 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4205 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4206 HadError = true; 4207 } 4208 4209 ImplicitExceptionSpecification Spec( 4210 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4211 4212 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4213 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4214 *ExceptionType = Context.getFunctionType( 4215 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4216 4217 QualType ArgType = OperType->getArgType(0); 4218 if (!ArgType->isRValueReferenceType()) { 4219 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4220 HadError = true; 4221 } else { 4222 if (ArgType->getPointeeType().isVolatileQualified()) { 4223 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4224 HadError = true; 4225 } 4226 if (ArgType->getPointeeType().isConstQualified()) { 4227 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4228 HadError = true; 4229 } 4230 } 4231 4232 if (OperType->getTypeQuals()) { 4233 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4234 HadError = true; 4235 } 4236 4237 if (OperType->hasExceptionSpec()) { 4238 if (CheckEquivalentExceptionSpec( 4239 PDiag(diag::err_incorrect_defaulted_exception_spec) 4240 << CXXMoveAssignment, 4241 PDiag(), 4242 ExceptionType, SourceLocation(), 4243 OperType, MD->getLocation())) { 4244 HadError = true; 4245 } 4246 } 4247 if (First) { 4248 // We set the declaration to have the computed exception spec here. 4249 // We duplicate the one parameter type. 4250 EPI.RefQualifier = OperType->getRefQualifier(); 4251 EPI.ExtInfo = OperType->getExtInfo(); 4252 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4253 4254 // Such a function is also trivial if the implicitly-declared function 4255 // would have been. 4256 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 4257 } 4258 4259 if (HadError) { 4260 MD->setInvalidDecl(); 4261 return; 4262 } 4263 4264 if (ShouldDeleteSpecialMember(MD, CXXMoveAssignment)) { 4265 if (First) { 4266 MD->setDeletedAsWritten(); 4267 } else { 4268 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4269 << CXXMoveAssignment; 4270 MD->setInvalidDecl(); 4271 } 4272 } 4273} 4274 4275void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4276 assert(DD->isExplicitlyDefaulted()); 4277 4278 // Whether this was the first-declared instance of the destructor. 4279 bool First = DD == DD->getCanonicalDecl(); 4280 4281 ImplicitExceptionSpecification Spec 4282 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4283 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4284 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4285 *ExceptionType = Context.getFunctionType( 4286 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4287 4288 if (DtorType->hasExceptionSpec()) { 4289 if (CheckEquivalentExceptionSpec( 4290 PDiag(diag::err_incorrect_defaulted_exception_spec) 4291 << CXXDestructor, 4292 PDiag(), 4293 ExceptionType, SourceLocation(), 4294 DtorType, DD->getLocation())) { 4295 DD->setInvalidDecl(); 4296 return; 4297 } 4298 } 4299 if (First) { 4300 // We set the declaration to have the computed exception spec here. 4301 // There are no parameters. 4302 EPI.ExtInfo = DtorType->getExtInfo(); 4303 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4304 4305 // Such a function is also trivial if the implicitly-declared function 4306 // would have been. 4307 DD->setTrivial(DD->getParent()->hasTrivialDestructor()); 4308 } 4309 4310 if (ShouldDeleteSpecialMember(DD, CXXDestructor)) { 4311 if (First) { 4312 DD->setDeletedAsWritten(); 4313 } else { 4314 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4315 << CXXDestructor; 4316 DD->setInvalidDecl(); 4317 } 4318 } 4319} 4320 4321namespace { 4322struct SpecialMemberDeletionInfo { 4323 Sema &S; 4324 CXXMethodDecl *MD; 4325 Sema::CXXSpecialMember CSM; 4326 4327 // Properties of the special member, computed for convenience. 4328 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4329 SourceLocation Loc; 4330 4331 bool AllFieldsAreConst; 4332 4333 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4334 Sema::CXXSpecialMember CSM) 4335 : S(S), MD(MD), CSM(CSM), 4336 IsConstructor(false), IsAssignment(false), IsMove(false), 4337 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4338 AllFieldsAreConst(true) { 4339 switch (CSM) { 4340 case Sema::CXXDefaultConstructor: 4341 case Sema::CXXCopyConstructor: 4342 IsConstructor = true; 4343 break; 4344 case Sema::CXXMoveConstructor: 4345 IsConstructor = true; 4346 IsMove = true; 4347 break; 4348 case Sema::CXXCopyAssignment: 4349 IsAssignment = true; 4350 break; 4351 case Sema::CXXMoveAssignment: 4352 IsAssignment = true; 4353 IsMove = true; 4354 break; 4355 case Sema::CXXDestructor: 4356 break; 4357 case Sema::CXXInvalid: 4358 llvm_unreachable("invalid special member kind"); 4359 } 4360 4361 if (MD->getNumParams()) { 4362 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4363 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4364 } 4365 } 4366 4367 bool inUnion() const { return MD->getParent()->isUnion(); } 4368 4369 /// Look up the corresponding special member in the given class. 4370 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class) { 4371 unsigned TQ = MD->getTypeQualifiers(); 4372 return S.LookupSpecialMember(Class, CSM, ConstArg, VolatileArg, 4373 MD->getRefQualifier() == RQ_RValue, 4374 TQ & Qualifiers::Const, 4375 TQ & Qualifiers::Volatile); 4376 } 4377 4378 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, FieldDecl *Field); 4379 4380 bool shouldDeleteForBase(CXXRecordDecl *BaseDecl, bool IsVirtualBase); 4381 bool shouldDeleteForField(FieldDecl *FD); 4382 bool shouldDeleteForAllConstMembers(); 4383}; 4384} 4385 4386/// Check whether we should delete a special member function due to having a 4387/// direct or virtual base class or static data member of class type M. 4388bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4389 CXXRecordDecl *Class, FieldDecl *Field) { 4390 // C++11 [class.ctor]p5, C++11 [class.copy]p11, C++11 [class.dtor]p5: 4391 // -- any direct or virtual base class [...] has a type with a destructor 4392 // that is deleted or inaccessible 4393 if (!IsAssignment) { 4394 CXXDestructorDecl *Dtor = S.LookupDestructor(Class); 4395 if (Dtor->isDeleted()) 4396 return true; 4397 if (S.CheckDestructorAccess(Loc, Dtor, S.PDiag()) != Sema::AR_accessible) 4398 return true; 4399 4400 // C++11 [class.dtor]p5: 4401 // -- X is a union-like class that has a variant member with a non-trivial 4402 // destructor 4403 if (CSM == Sema::CXXDestructor && Field && Field->getParent()->isUnion() && 4404 !Dtor->isTrivial()) 4405 return true; 4406 } 4407 4408 // C++11 [class.ctor]p5: 4409 // -- any direct or virtual base class [...] has class type M [...] and 4410 // either M has no default constructor or overload resolution as applied 4411 // to M's default constructor results in an ambiguity or in a function 4412 // that is deleted or inaccessible 4413 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4414 // -- a direct or virtual base class B that cannot be copied/moved because 4415 // overload resolution, as applied to B's corresponding special member, 4416 // results in an ambiguity or a function that is deleted or inaccessible 4417 // from the defaulted special member 4418 // FIXME: in-class initializers should be handled here 4419 if (CSM != Sema::CXXDestructor) { 4420 Sema::SpecialMemberOverloadResult *SMOR = lookupIn(Class); 4421 if (!SMOR->hasSuccess()) 4422 return true; 4423 4424 CXXMethodDecl *Member = SMOR->getMethod(); 4425 // A member of a union must have a trivial corresponding special member. 4426 if (Field && Field->getParent()->isUnion() && !Member->isTrivial()) 4427 return true; 4428 4429 if (IsConstructor) { 4430 CXXConstructorDecl *Ctor = cast<CXXConstructorDecl>(Member); 4431 if (S.CheckConstructorAccess(Loc, Ctor, Ctor->getAccess(), S.PDiag()) 4432 != Sema::AR_accessible) 4433 return true; 4434 4435 // -- for the move constructor, a [...] direct or virtual base class with 4436 // a type that does not have a move constructor and is not trivially 4437 // copyable. 4438 if (IsMove && !Ctor->isMoveConstructor() && !Class->isTriviallyCopyable()) 4439 return true; 4440 } else { 4441 assert(IsAssignment && "unexpected kind of special member"); 4442 if (S.CheckDirectMemberAccess(Loc, Member, S.PDiag()) 4443 != Sema::AR_accessible) 4444 return true; 4445 4446 // -- for the move assignment operator, a direct base class with a type 4447 // that does not have a move assignment operator and is not trivially 4448 // copyable. 4449 if (IsMove && !Member->isMoveAssignmentOperator() && 4450 !Class->isTriviallyCopyable()) 4451 return true; 4452 } 4453 } 4454 4455 return false; 4456} 4457 4458/// Check whether we should delete a special member function due to the class 4459/// having a particular direct or virtual base class. 4460bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXRecordDecl *BaseDecl, 4461 bool IsVirtualBase) { 4462 // C++11 [class.copy]p23: 4463 // -- for the move assignment operator, any direct or indirect virtual 4464 // base class. 4465 if (CSM == Sema::CXXMoveAssignment && IsVirtualBase) 4466 return true; 4467 4468 if (shouldDeleteForClassSubobject(BaseDecl, 0)) 4469 return true; 4470 4471 return false; 4472} 4473 4474/// Check whether we should delete a special member function due to the class 4475/// having a particular non-static data member. 4476bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4477 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4478 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4479 4480 if (CSM == Sema::CXXDefaultConstructor) { 4481 // For a default constructor, all references must be initialized in-class 4482 // and, if a union, it must have a non-const member. 4483 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) 4484 return true; 4485 4486 if (inUnion() && !FieldType.isConstQualified()) 4487 AllFieldsAreConst = false; 4488 4489 // C++11 [class.ctor]p5: any non-variant non-static data member of 4490 // const-qualified type (or array thereof) with no 4491 // brace-or-equal-initializer does not have a user-provided default 4492 // constructor. 4493 if (!inUnion() && FieldType.isConstQualified() && 4494 !FD->hasInClassInitializer() && 4495 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) 4496 return true; 4497 } else if (CSM == Sema::CXXCopyConstructor) { 4498 // For a copy constructor, data members must not be of rvalue reference 4499 // type. 4500 if (FieldType->isRValueReferenceType()) 4501 return true; 4502 } else if (IsAssignment) { 4503 // For an assignment operator, data members must not be of reference type. 4504 if (FieldType->isReferenceType()) 4505 return true; 4506 } 4507 4508 if (FieldRecord) { 4509 // Some additional restrictions exist on the variant members. 4510 if (!inUnion() && FieldRecord->isUnion() && 4511 FieldRecord->isAnonymousStructOrUnion()) { 4512 bool AllVariantFieldsAreConst = true; 4513 4514 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4515 UE = FieldRecord->field_end(); 4516 UI != UE; ++UI) { 4517 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4518 4519 if (!UnionFieldType.isConstQualified()) 4520 AllVariantFieldsAreConst = false; 4521 4522 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4523 if (UnionFieldRecord && 4524 shouldDeleteForClassSubobject(UnionFieldRecord, *UI)) 4525 return true; 4526 } 4527 4528 // At least one member in each anonymous union must be non-const 4529 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4530 FieldRecord->field_begin() != FieldRecord->field_end()) 4531 return true; 4532 4533 // Don't try to initialize the anonymous union 4534 // This is technically non-conformant, but sanity demands it. 4535 return false; 4536 } 4537 4538 // When checking a constructor, the field's destructor must be accessible 4539 // and not deleted. 4540 if (IsConstructor) { 4541 CXXDestructorDecl *FieldDtor = S.LookupDestructor(FieldRecord); 4542 if (FieldDtor->isDeleted()) 4543 return true; 4544 if (S.CheckDestructorAccess(Loc, FieldDtor, S.PDiag()) != 4545 Sema::AR_accessible) 4546 return true; 4547 } 4548 4549 // Check that the corresponding member of the field is accessible, 4550 // unique, and non-deleted. We don't do this if it has an explicit 4551 // initialization when default-constructing. 4552 if (!(CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer())) { 4553 Sema::SpecialMemberOverloadResult *SMOR = lookupIn(FieldRecord); 4554 if (!SMOR->hasSuccess()) 4555 return true; 4556 4557 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4558 4559 // We need the corresponding member of a union to be trivial so that 4560 // we can safely process all members simultaneously. 4561 if (inUnion() && !FieldMember->isTrivial()) 4562 return true; 4563 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 if (CSM == Sema::CXXDestructor) { 4577 CXXDestructorDecl *FieldDtor = S.LookupDestructor(FieldRecord); 4578 if (FieldDtor->isDeleted()) 4579 return true; 4580 if (S.CheckDestructorAccess(Loc, FieldDtor, S.PDiag()) != 4581 Sema::AR_accessible) 4582 return true; 4583 } else { 4584 assert(IsAssignment && "unexpected kind of special member"); 4585 if (S.CheckDirectMemberAccess(Loc, FieldMember, S.PDiag()) 4586 != Sema::AR_accessible) 4587 return true; 4588 4589 // -- for the move assignment operator, a non-static data member with a 4590 // type that does not have a move assignment operator and is not 4591 // trivially copyable. 4592 if (IsMove && !FieldMember->isMoveAssignmentOperator() && 4593 !FieldRecord->isTriviallyCopyable()) 4594 return true; 4595 } 4596 } 4597 } else if (IsAssignment && FieldType.isConstQualified()) { 4598 // C++11 [class.copy]p23: 4599 // -- a non-static data member of const non-class type (or array thereof) 4600 return true; 4601 } 4602 4603 return false; 4604} 4605 4606/// C++11 [class.ctor] p5: 4607/// A defaulted default constructor for a class X is defined as deleted if 4608/// X is a union and all of its variant members are of const-qualified type. 4609bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4610 // This is a silly definition, because it gives an empty union a deleted 4611 // default constructor. Don't do that. 4612 return CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4613 (MD->getParent()->field_begin() != MD->getParent()->field_end()); 4614} 4615 4616/// Determine whether a defaulted special member function should be defined as 4617/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4618/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4619bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4620 assert(!MD->isInvalidDecl()); 4621 CXXRecordDecl *RD = MD->getParent(); 4622 assert(!RD->isDependentType() && "do deletion after instantiation"); 4623 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4624 return false; 4625 4626 // FIXME: Provide the ability to diagnose why a special member was deleted. 4627 4628 // C++11 [expr.lambda.prim]p19: 4629 // The closure type associated with a lambda-expression has a 4630 // deleted (8.4.3) default constructor and a deleted copy 4631 // assignment operator. 4632 if (RD->isLambda() && 4633 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) 4634 return true; 4635 4636 // C++11 [class.dtor]p5: 4637 // -- for a virtual destructor, lookup of the non-array deallocation function 4638 // results in an ambiguity or in a function that is deleted or inaccessible 4639 if (CSM == Sema::CXXDestructor && MD->isVirtual()) { 4640 FunctionDecl *OperatorDelete = 0; 4641 DeclarationName Name = 4642 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4643 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4644 OperatorDelete, false)) 4645 return true; 4646 } 4647 4648 // For an anonymous struct or union, the copy and assignment special members 4649 // will never be used, so skip the check. For an anonymous union declared at 4650 // namespace scope, the constructor and destructor are used. 4651 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4652 RD->isAnonymousStructOrUnion()) 4653 return false; 4654 4655 // Do access control from the special member function 4656 ContextRAII MethodContext(*this, MD); 4657 4658 SpecialMemberDeletionInfo SMI(*this, MD, CSM); 4659 4660 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4661 BE = RD->bases_end(); BI != BE; ++BI) 4662 if (!BI->isVirtual() && 4663 SMI.shouldDeleteForBase(BI->getType()->getAsCXXRecordDecl(), false)) 4664 return true; 4665 4666 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4667 BE = RD->vbases_end(); BI != BE; ++BI) 4668 if (SMI.shouldDeleteForBase(BI->getType()->getAsCXXRecordDecl(), true)) 4669 return true; 4670 4671 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4672 FE = RD->field_end(); FI != FE; ++FI) 4673 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4674 SMI.shouldDeleteForField(*FI)) 4675 return true; 4676 4677 if (SMI.shouldDeleteForAllConstMembers()) 4678 return true; 4679 4680 return false; 4681} 4682 4683/// \brief Data used with FindHiddenVirtualMethod 4684namespace { 4685 struct FindHiddenVirtualMethodData { 4686 Sema *S; 4687 CXXMethodDecl *Method; 4688 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4689 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4690 }; 4691} 4692 4693/// \brief Member lookup function that determines whether a given C++ 4694/// method overloads virtual methods in a base class without overriding any, 4695/// to be used with CXXRecordDecl::lookupInBases(). 4696static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4697 CXXBasePath &Path, 4698 void *UserData) { 4699 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4700 4701 FindHiddenVirtualMethodData &Data 4702 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4703 4704 DeclarationName Name = Data.Method->getDeclName(); 4705 assert(Name.getNameKind() == DeclarationName::Identifier); 4706 4707 bool foundSameNameMethod = false; 4708 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4709 for (Path.Decls = BaseRecord->lookup(Name); 4710 Path.Decls.first != Path.Decls.second; 4711 ++Path.Decls.first) { 4712 NamedDecl *D = *Path.Decls.first; 4713 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4714 MD = MD->getCanonicalDecl(); 4715 foundSameNameMethod = true; 4716 // Interested only in hidden virtual methods. 4717 if (!MD->isVirtual()) 4718 continue; 4719 // If the method we are checking overrides a method from its base 4720 // don't warn about the other overloaded methods. 4721 if (!Data.S->IsOverload(Data.Method, MD, false)) 4722 return true; 4723 // Collect the overload only if its hidden. 4724 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4725 overloadedMethods.push_back(MD); 4726 } 4727 } 4728 4729 if (foundSameNameMethod) 4730 Data.OverloadedMethods.append(overloadedMethods.begin(), 4731 overloadedMethods.end()); 4732 return foundSameNameMethod; 4733} 4734 4735/// \brief See if a method overloads virtual methods in a base class without 4736/// overriding any. 4737void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4738 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4739 MD->getLocation()) == DiagnosticsEngine::Ignored) 4740 return; 4741 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4742 return; 4743 4744 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4745 /*bool RecordPaths=*/false, 4746 /*bool DetectVirtual=*/false); 4747 FindHiddenVirtualMethodData Data; 4748 Data.Method = MD; 4749 Data.S = this; 4750 4751 // Keep the base methods that were overriden or introduced in the subclass 4752 // by 'using' in a set. A base method not in this set is hidden. 4753 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4754 res.first != res.second; ++res.first) { 4755 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4756 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4757 E = MD->end_overridden_methods(); 4758 I != E; ++I) 4759 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4760 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4761 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4762 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4763 } 4764 4765 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4766 !Data.OverloadedMethods.empty()) { 4767 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4768 << MD << (Data.OverloadedMethods.size() > 1); 4769 4770 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4771 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4772 Diag(overloadedMD->getLocation(), 4773 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4774 } 4775 } 4776} 4777 4778void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4779 Decl *TagDecl, 4780 SourceLocation LBrac, 4781 SourceLocation RBrac, 4782 AttributeList *AttrList) { 4783 if (!TagDecl) 4784 return; 4785 4786 AdjustDeclIfTemplate(TagDecl); 4787 4788 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4789 // strict aliasing violation! 4790 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4791 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4792 4793 CheckCompletedCXXClass( 4794 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4795} 4796 4797/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4798/// special functions, such as the default constructor, copy 4799/// constructor, or destructor, to the given C++ class (C++ 4800/// [special]p1). This routine can only be executed just before the 4801/// definition of the class is complete. 4802void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4803 if (!ClassDecl->hasUserDeclaredConstructor()) 4804 ++ASTContext::NumImplicitDefaultConstructors; 4805 4806 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4807 ++ASTContext::NumImplicitCopyConstructors; 4808 4809 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4810 ++ASTContext::NumImplicitMoveConstructors; 4811 4812 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4813 ++ASTContext::NumImplicitCopyAssignmentOperators; 4814 4815 // If we have a dynamic class, then the copy assignment operator may be 4816 // virtual, so we have to declare it immediately. This ensures that, e.g., 4817 // it shows up in the right place in the vtable and that we diagnose 4818 // problems with the implicit exception specification. 4819 if (ClassDecl->isDynamicClass()) 4820 DeclareImplicitCopyAssignment(ClassDecl); 4821 } 4822 4823 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()){ 4824 ++ASTContext::NumImplicitMoveAssignmentOperators; 4825 4826 // Likewise for the move assignment operator. 4827 if (ClassDecl->isDynamicClass()) 4828 DeclareImplicitMoveAssignment(ClassDecl); 4829 } 4830 4831 if (!ClassDecl->hasUserDeclaredDestructor()) { 4832 ++ASTContext::NumImplicitDestructors; 4833 4834 // If we have a dynamic class, then the destructor may be virtual, so we 4835 // have to declare the destructor immediately. This ensures that, e.g., it 4836 // shows up in the right place in the vtable and that we diagnose problems 4837 // with the implicit exception specification. 4838 if (ClassDecl->isDynamicClass()) 4839 DeclareImplicitDestructor(ClassDecl); 4840 } 4841} 4842 4843void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4844 if (!D) 4845 return; 4846 4847 int NumParamList = D->getNumTemplateParameterLists(); 4848 for (int i = 0; i < NumParamList; i++) { 4849 TemplateParameterList* Params = D->getTemplateParameterList(i); 4850 for (TemplateParameterList::iterator Param = Params->begin(), 4851 ParamEnd = Params->end(); 4852 Param != ParamEnd; ++Param) { 4853 NamedDecl *Named = cast<NamedDecl>(*Param); 4854 if (Named->getDeclName()) { 4855 S->AddDecl(Named); 4856 IdResolver.AddDecl(Named); 4857 } 4858 } 4859 } 4860} 4861 4862void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4863 if (!D) 4864 return; 4865 4866 TemplateParameterList *Params = 0; 4867 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4868 Params = Template->getTemplateParameters(); 4869 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4870 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4871 Params = PartialSpec->getTemplateParameters(); 4872 else 4873 return; 4874 4875 for (TemplateParameterList::iterator Param = Params->begin(), 4876 ParamEnd = Params->end(); 4877 Param != ParamEnd; ++Param) { 4878 NamedDecl *Named = cast<NamedDecl>(*Param); 4879 if (Named->getDeclName()) { 4880 S->AddDecl(Named); 4881 IdResolver.AddDecl(Named); 4882 } 4883 } 4884} 4885 4886void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4887 if (!RecordD) return; 4888 AdjustDeclIfTemplate(RecordD); 4889 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4890 PushDeclContext(S, Record); 4891} 4892 4893void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4894 if (!RecordD) return; 4895 PopDeclContext(); 4896} 4897 4898/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4899/// parsing a top-level (non-nested) C++ class, and we are now 4900/// parsing those parts of the given Method declaration that could 4901/// not be parsed earlier (C++ [class.mem]p2), such as default 4902/// arguments. This action should enter the scope of the given 4903/// Method declaration as if we had just parsed the qualified method 4904/// name. However, it should not bring the parameters into scope; 4905/// that will be performed by ActOnDelayedCXXMethodParameter. 4906void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4907} 4908 4909/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4910/// C++ method declaration. We're (re-)introducing the given 4911/// function parameter into scope for use in parsing later parts of 4912/// the method declaration. For example, we could see an 4913/// ActOnParamDefaultArgument event for this parameter. 4914void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4915 if (!ParamD) 4916 return; 4917 4918 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4919 4920 // If this parameter has an unparsed default argument, clear it out 4921 // to make way for the parsed default argument. 4922 if (Param->hasUnparsedDefaultArg()) 4923 Param->setDefaultArg(0); 4924 4925 S->AddDecl(Param); 4926 if (Param->getDeclName()) 4927 IdResolver.AddDecl(Param); 4928} 4929 4930/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4931/// processing the delayed method declaration for Method. The method 4932/// declaration is now considered finished. There may be a separate 4933/// ActOnStartOfFunctionDef action later (not necessarily 4934/// immediately!) for this method, if it was also defined inside the 4935/// class body. 4936void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4937 if (!MethodD) 4938 return; 4939 4940 AdjustDeclIfTemplate(MethodD); 4941 4942 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4943 4944 // Now that we have our default arguments, check the constructor 4945 // again. It could produce additional diagnostics or affect whether 4946 // the class has implicitly-declared destructors, among other 4947 // things. 4948 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4949 CheckConstructor(Constructor); 4950 4951 // Check the default arguments, which we may have added. 4952 if (!Method->isInvalidDecl()) 4953 CheckCXXDefaultArguments(Method); 4954} 4955 4956/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4957/// the well-formedness of the constructor declarator @p D with type @p 4958/// R. If there are any errors in the declarator, this routine will 4959/// emit diagnostics and set the invalid bit to true. In any case, the type 4960/// will be updated to reflect a well-formed type for the constructor and 4961/// returned. 4962QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4963 StorageClass &SC) { 4964 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4965 4966 // C++ [class.ctor]p3: 4967 // A constructor shall not be virtual (10.3) or static (9.4). A 4968 // constructor can be invoked for a const, volatile or const 4969 // volatile object. A constructor shall not be declared const, 4970 // volatile, or const volatile (9.3.2). 4971 if (isVirtual) { 4972 if (!D.isInvalidType()) 4973 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4974 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4975 << SourceRange(D.getIdentifierLoc()); 4976 D.setInvalidType(); 4977 } 4978 if (SC == SC_Static) { 4979 if (!D.isInvalidType()) 4980 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4981 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4982 << SourceRange(D.getIdentifierLoc()); 4983 D.setInvalidType(); 4984 SC = SC_None; 4985 } 4986 4987 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4988 if (FTI.TypeQuals != 0) { 4989 if (FTI.TypeQuals & Qualifiers::Const) 4990 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4991 << "const" << SourceRange(D.getIdentifierLoc()); 4992 if (FTI.TypeQuals & Qualifiers::Volatile) 4993 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4994 << "volatile" << SourceRange(D.getIdentifierLoc()); 4995 if (FTI.TypeQuals & Qualifiers::Restrict) 4996 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4997 << "restrict" << SourceRange(D.getIdentifierLoc()); 4998 D.setInvalidType(); 4999 } 5000 5001 // C++0x [class.ctor]p4: 5002 // A constructor shall not be declared with a ref-qualifier. 5003 if (FTI.hasRefQualifier()) { 5004 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5005 << FTI.RefQualifierIsLValueRef 5006 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5007 D.setInvalidType(); 5008 } 5009 5010 // Rebuild the function type "R" without any type qualifiers (in 5011 // case any of the errors above fired) and with "void" as the 5012 // return type, since constructors don't have return types. 5013 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5014 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5015 return R; 5016 5017 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5018 EPI.TypeQuals = 0; 5019 EPI.RefQualifier = RQ_None; 5020 5021 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5022 Proto->getNumArgs(), EPI); 5023} 5024 5025/// CheckConstructor - Checks a fully-formed constructor for 5026/// well-formedness, issuing any diagnostics required. Returns true if 5027/// the constructor declarator is invalid. 5028void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5029 CXXRecordDecl *ClassDecl 5030 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5031 if (!ClassDecl) 5032 return Constructor->setInvalidDecl(); 5033 5034 // C++ [class.copy]p3: 5035 // A declaration of a constructor for a class X is ill-formed if 5036 // its first parameter is of type (optionally cv-qualified) X and 5037 // either there are no other parameters or else all other 5038 // parameters have default arguments. 5039 if (!Constructor->isInvalidDecl() && 5040 ((Constructor->getNumParams() == 1) || 5041 (Constructor->getNumParams() > 1 && 5042 Constructor->getParamDecl(1)->hasDefaultArg())) && 5043 Constructor->getTemplateSpecializationKind() 5044 != TSK_ImplicitInstantiation) { 5045 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5046 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5047 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5048 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5049 const char *ConstRef 5050 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5051 : " const &"; 5052 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5053 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5054 5055 // FIXME: Rather that making the constructor invalid, we should endeavor 5056 // to fix the type. 5057 Constructor->setInvalidDecl(); 5058 } 5059 } 5060} 5061 5062/// CheckDestructor - Checks a fully-formed destructor definition for 5063/// well-formedness, issuing any diagnostics required. Returns true 5064/// on error. 5065bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5066 CXXRecordDecl *RD = Destructor->getParent(); 5067 5068 if (Destructor->isVirtual()) { 5069 SourceLocation Loc; 5070 5071 if (!Destructor->isImplicit()) 5072 Loc = Destructor->getLocation(); 5073 else 5074 Loc = RD->getLocation(); 5075 5076 // If we have a virtual destructor, look up the deallocation function 5077 FunctionDecl *OperatorDelete = 0; 5078 DeclarationName Name = 5079 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5080 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5081 return true; 5082 5083 MarkFunctionReferenced(Loc, OperatorDelete); 5084 5085 Destructor->setOperatorDelete(OperatorDelete); 5086 } 5087 5088 return false; 5089} 5090 5091static inline bool 5092FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5093 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5094 FTI.ArgInfo[0].Param && 5095 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5096} 5097 5098/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5099/// the well-formednes of the destructor declarator @p D with type @p 5100/// R. If there are any errors in the declarator, this routine will 5101/// emit diagnostics and set the declarator to invalid. Even if this happens, 5102/// will be updated to reflect a well-formed type for the destructor and 5103/// returned. 5104QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5105 StorageClass& SC) { 5106 // C++ [class.dtor]p1: 5107 // [...] A typedef-name that names a class is a class-name 5108 // (7.1.3); however, a typedef-name that names a class shall not 5109 // be used as the identifier in the declarator for a destructor 5110 // declaration. 5111 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5112 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5113 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5114 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5115 else if (const TemplateSpecializationType *TST = 5116 DeclaratorType->getAs<TemplateSpecializationType>()) 5117 if (TST->isTypeAlias()) 5118 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5119 << DeclaratorType << 1; 5120 5121 // C++ [class.dtor]p2: 5122 // A destructor is used to destroy objects of its class type. A 5123 // destructor takes no parameters, and no return type can be 5124 // specified for it (not even void). The address of a destructor 5125 // shall not be taken. A destructor shall not be static. A 5126 // destructor can be invoked for a const, volatile or const 5127 // volatile object. A destructor shall not be declared const, 5128 // volatile or const volatile (9.3.2). 5129 if (SC == SC_Static) { 5130 if (!D.isInvalidType()) 5131 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5132 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5133 << SourceRange(D.getIdentifierLoc()) 5134 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5135 5136 SC = SC_None; 5137 } 5138 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5139 // Destructors don't have return types, but the parser will 5140 // happily parse something like: 5141 // 5142 // class X { 5143 // float ~X(); 5144 // }; 5145 // 5146 // The return type will be eliminated later. 5147 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5148 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5149 << SourceRange(D.getIdentifierLoc()); 5150 } 5151 5152 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5153 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5154 if (FTI.TypeQuals & Qualifiers::Const) 5155 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5156 << "const" << SourceRange(D.getIdentifierLoc()); 5157 if (FTI.TypeQuals & Qualifiers::Volatile) 5158 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5159 << "volatile" << SourceRange(D.getIdentifierLoc()); 5160 if (FTI.TypeQuals & Qualifiers::Restrict) 5161 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5162 << "restrict" << SourceRange(D.getIdentifierLoc()); 5163 D.setInvalidType(); 5164 } 5165 5166 // C++0x [class.dtor]p2: 5167 // A destructor shall not be declared with a ref-qualifier. 5168 if (FTI.hasRefQualifier()) { 5169 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5170 << FTI.RefQualifierIsLValueRef 5171 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5172 D.setInvalidType(); 5173 } 5174 5175 // Make sure we don't have any parameters. 5176 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5177 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5178 5179 // Delete the parameters. 5180 FTI.freeArgs(); 5181 D.setInvalidType(); 5182 } 5183 5184 // Make sure the destructor isn't variadic. 5185 if (FTI.isVariadic) { 5186 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5187 D.setInvalidType(); 5188 } 5189 5190 // Rebuild the function type "R" without any type qualifiers or 5191 // parameters (in case any of the errors above fired) and with 5192 // "void" as the return type, since destructors don't have return 5193 // types. 5194 if (!D.isInvalidType()) 5195 return R; 5196 5197 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5198 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5199 EPI.Variadic = false; 5200 EPI.TypeQuals = 0; 5201 EPI.RefQualifier = RQ_None; 5202 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5203} 5204 5205/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5206/// well-formednes of the conversion function declarator @p D with 5207/// type @p R. If there are any errors in the declarator, this routine 5208/// will emit diagnostics and return true. Otherwise, it will return 5209/// false. Either way, the type @p R will be updated to reflect a 5210/// well-formed type for the conversion operator. 5211void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5212 StorageClass& SC) { 5213 // C++ [class.conv.fct]p1: 5214 // Neither parameter types nor return type can be specified. The 5215 // type of a conversion function (8.3.5) is "function taking no 5216 // parameter returning conversion-type-id." 5217 if (SC == SC_Static) { 5218 if (!D.isInvalidType()) 5219 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5220 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5221 << SourceRange(D.getIdentifierLoc()); 5222 D.setInvalidType(); 5223 SC = SC_None; 5224 } 5225 5226 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5227 5228 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5229 // Conversion functions don't have return types, but the parser will 5230 // happily parse something like: 5231 // 5232 // class X { 5233 // float operator bool(); 5234 // }; 5235 // 5236 // The return type will be changed later anyway. 5237 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5238 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5239 << SourceRange(D.getIdentifierLoc()); 5240 D.setInvalidType(); 5241 } 5242 5243 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5244 5245 // Make sure we don't have any parameters. 5246 if (Proto->getNumArgs() > 0) { 5247 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5248 5249 // Delete the parameters. 5250 D.getFunctionTypeInfo().freeArgs(); 5251 D.setInvalidType(); 5252 } else if (Proto->isVariadic()) { 5253 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5254 D.setInvalidType(); 5255 } 5256 5257 // Diagnose "&operator bool()" and other such nonsense. This 5258 // is actually a gcc extension which we don't support. 5259 if (Proto->getResultType() != ConvType) { 5260 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5261 << Proto->getResultType(); 5262 D.setInvalidType(); 5263 ConvType = Proto->getResultType(); 5264 } 5265 5266 // C++ [class.conv.fct]p4: 5267 // The conversion-type-id shall not represent a function type nor 5268 // an array type. 5269 if (ConvType->isArrayType()) { 5270 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5271 ConvType = Context.getPointerType(ConvType); 5272 D.setInvalidType(); 5273 } else if (ConvType->isFunctionType()) { 5274 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5275 ConvType = Context.getPointerType(ConvType); 5276 D.setInvalidType(); 5277 } 5278 5279 // Rebuild the function type "R" without any parameters (in case any 5280 // of the errors above fired) and with the conversion type as the 5281 // return type. 5282 if (D.isInvalidType()) 5283 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5284 5285 // C++0x explicit conversion operators. 5286 if (D.getDeclSpec().isExplicitSpecified()) 5287 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5288 getLangOptions().CPlusPlus0x ? 5289 diag::warn_cxx98_compat_explicit_conversion_functions : 5290 diag::ext_explicit_conversion_functions) 5291 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5292} 5293 5294/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5295/// the declaration of the given C++ conversion function. This routine 5296/// is responsible for recording the conversion function in the C++ 5297/// class, if possible. 5298Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5299 assert(Conversion && "Expected to receive a conversion function declaration"); 5300 5301 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5302 5303 // Make sure we aren't redeclaring the conversion function. 5304 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5305 5306 // C++ [class.conv.fct]p1: 5307 // [...] A conversion function is never used to convert a 5308 // (possibly cv-qualified) object to the (possibly cv-qualified) 5309 // same object type (or a reference to it), to a (possibly 5310 // cv-qualified) base class of that type (or a reference to it), 5311 // or to (possibly cv-qualified) void. 5312 // FIXME: Suppress this warning if the conversion function ends up being a 5313 // virtual function that overrides a virtual function in a base class. 5314 QualType ClassType 5315 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5316 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5317 ConvType = ConvTypeRef->getPointeeType(); 5318 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5319 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5320 /* Suppress diagnostics for instantiations. */; 5321 else if (ConvType->isRecordType()) { 5322 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5323 if (ConvType == ClassType) 5324 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5325 << ClassType; 5326 else if (IsDerivedFrom(ClassType, ConvType)) 5327 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5328 << ClassType << ConvType; 5329 } else if (ConvType->isVoidType()) { 5330 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5331 << ClassType << ConvType; 5332 } 5333 5334 if (FunctionTemplateDecl *ConversionTemplate 5335 = Conversion->getDescribedFunctionTemplate()) 5336 return ConversionTemplate; 5337 5338 return Conversion; 5339} 5340 5341//===----------------------------------------------------------------------===// 5342// Namespace Handling 5343//===----------------------------------------------------------------------===// 5344 5345 5346 5347/// ActOnStartNamespaceDef - This is called at the start of a namespace 5348/// definition. 5349Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5350 SourceLocation InlineLoc, 5351 SourceLocation NamespaceLoc, 5352 SourceLocation IdentLoc, 5353 IdentifierInfo *II, 5354 SourceLocation LBrace, 5355 AttributeList *AttrList) { 5356 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5357 // For anonymous namespace, take the location of the left brace. 5358 SourceLocation Loc = II ? IdentLoc : LBrace; 5359 bool IsInline = InlineLoc.isValid(); 5360 bool IsInvalid = false; 5361 bool IsStd = false; 5362 bool AddToKnown = false; 5363 Scope *DeclRegionScope = NamespcScope->getParent(); 5364 5365 NamespaceDecl *PrevNS = 0; 5366 if (II) { 5367 // C++ [namespace.def]p2: 5368 // The identifier in an original-namespace-definition shall not 5369 // have been previously defined in the declarative region in 5370 // which the original-namespace-definition appears. The 5371 // identifier in an original-namespace-definition is the name of 5372 // the namespace. Subsequently in that declarative region, it is 5373 // treated as an original-namespace-name. 5374 // 5375 // Since namespace names are unique in their scope, and we don't 5376 // look through using directives, just look for any ordinary names. 5377 5378 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5379 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5380 Decl::IDNS_Namespace; 5381 NamedDecl *PrevDecl = 0; 5382 for (DeclContext::lookup_result R 5383 = CurContext->getRedeclContext()->lookup(II); 5384 R.first != R.second; ++R.first) { 5385 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5386 PrevDecl = *R.first; 5387 break; 5388 } 5389 } 5390 5391 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5392 5393 if (PrevNS) { 5394 // This is an extended namespace definition. 5395 if (IsInline != PrevNS->isInline()) { 5396 // inline-ness must match 5397 if (PrevNS->isInline()) { 5398 // The user probably just forgot the 'inline', so suggest that it 5399 // be added back. 5400 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5401 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5402 } else { 5403 Diag(Loc, diag::err_inline_namespace_mismatch) 5404 << IsInline; 5405 } 5406 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5407 5408 IsInline = PrevNS->isInline(); 5409 } 5410 } else if (PrevDecl) { 5411 // This is an invalid name redefinition. 5412 Diag(Loc, diag::err_redefinition_different_kind) 5413 << II; 5414 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5415 IsInvalid = true; 5416 // Continue on to push Namespc as current DeclContext and return it. 5417 } else if (II->isStr("std") && 5418 CurContext->getRedeclContext()->isTranslationUnit()) { 5419 // This is the first "real" definition of the namespace "std", so update 5420 // our cache of the "std" namespace to point at this definition. 5421 PrevNS = getStdNamespace(); 5422 IsStd = true; 5423 AddToKnown = !IsInline; 5424 } else { 5425 // We've seen this namespace for the first time. 5426 AddToKnown = !IsInline; 5427 } 5428 } else { 5429 // Anonymous namespaces. 5430 5431 // Determine whether the parent already has an anonymous namespace. 5432 DeclContext *Parent = CurContext->getRedeclContext(); 5433 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5434 PrevNS = TU->getAnonymousNamespace(); 5435 } else { 5436 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5437 PrevNS = ND->getAnonymousNamespace(); 5438 } 5439 5440 if (PrevNS && IsInline != PrevNS->isInline()) { 5441 // inline-ness must match 5442 Diag(Loc, diag::err_inline_namespace_mismatch) 5443 << IsInline; 5444 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5445 5446 // Recover by ignoring the new namespace's inline status. 5447 IsInline = PrevNS->isInline(); 5448 } 5449 } 5450 5451 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5452 StartLoc, Loc, II, PrevNS); 5453 if (IsInvalid) 5454 Namespc->setInvalidDecl(); 5455 5456 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5457 5458 // FIXME: Should we be merging attributes? 5459 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5460 PushNamespaceVisibilityAttr(Attr, Loc); 5461 5462 if (IsStd) 5463 StdNamespace = Namespc; 5464 if (AddToKnown) 5465 KnownNamespaces[Namespc] = false; 5466 5467 if (II) { 5468 PushOnScopeChains(Namespc, DeclRegionScope); 5469 } else { 5470 // Link the anonymous namespace into its parent. 5471 DeclContext *Parent = CurContext->getRedeclContext(); 5472 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5473 TU->setAnonymousNamespace(Namespc); 5474 } else { 5475 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5476 } 5477 5478 CurContext->addDecl(Namespc); 5479 5480 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5481 // behaves as if it were replaced by 5482 // namespace unique { /* empty body */ } 5483 // using namespace unique; 5484 // namespace unique { namespace-body } 5485 // where all occurrences of 'unique' in a translation unit are 5486 // replaced by the same identifier and this identifier differs 5487 // from all other identifiers in the entire program. 5488 5489 // We just create the namespace with an empty name and then add an 5490 // implicit using declaration, just like the standard suggests. 5491 // 5492 // CodeGen enforces the "universally unique" aspect by giving all 5493 // declarations semantically contained within an anonymous 5494 // namespace internal linkage. 5495 5496 if (!PrevNS) { 5497 UsingDirectiveDecl* UD 5498 = UsingDirectiveDecl::Create(Context, CurContext, 5499 /* 'using' */ LBrace, 5500 /* 'namespace' */ SourceLocation(), 5501 /* qualifier */ NestedNameSpecifierLoc(), 5502 /* identifier */ SourceLocation(), 5503 Namespc, 5504 /* Ancestor */ CurContext); 5505 UD->setImplicit(); 5506 CurContext->addDecl(UD); 5507 } 5508 } 5509 5510 // Although we could have an invalid decl (i.e. the namespace name is a 5511 // redefinition), push it as current DeclContext and try to continue parsing. 5512 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5513 // for the namespace has the declarations that showed up in that particular 5514 // namespace definition. 5515 PushDeclContext(NamespcScope, Namespc); 5516 return Namespc; 5517} 5518 5519/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5520/// is a namespace alias, returns the namespace it points to. 5521static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5522 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5523 return AD->getNamespace(); 5524 return dyn_cast_or_null<NamespaceDecl>(D); 5525} 5526 5527/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5528/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5529void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5530 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5531 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5532 Namespc->setRBraceLoc(RBrace); 5533 PopDeclContext(); 5534 if (Namespc->hasAttr<VisibilityAttr>()) 5535 PopPragmaVisibility(true, RBrace); 5536} 5537 5538CXXRecordDecl *Sema::getStdBadAlloc() const { 5539 return cast_or_null<CXXRecordDecl>( 5540 StdBadAlloc.get(Context.getExternalSource())); 5541} 5542 5543NamespaceDecl *Sema::getStdNamespace() const { 5544 return cast_or_null<NamespaceDecl>( 5545 StdNamespace.get(Context.getExternalSource())); 5546} 5547 5548/// \brief Retrieve the special "std" namespace, which may require us to 5549/// implicitly define the namespace. 5550NamespaceDecl *Sema::getOrCreateStdNamespace() { 5551 if (!StdNamespace) { 5552 // The "std" namespace has not yet been defined, so build one implicitly. 5553 StdNamespace = NamespaceDecl::Create(Context, 5554 Context.getTranslationUnitDecl(), 5555 /*Inline=*/false, 5556 SourceLocation(), SourceLocation(), 5557 &PP.getIdentifierTable().get("std"), 5558 /*PrevDecl=*/0); 5559 getStdNamespace()->setImplicit(true); 5560 } 5561 5562 return getStdNamespace(); 5563} 5564 5565bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5566 assert(getLangOptions().CPlusPlus && 5567 "Looking for std::initializer_list outside of C++."); 5568 5569 // We're looking for implicit instantiations of 5570 // template <typename E> class std::initializer_list. 5571 5572 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5573 return false; 5574 5575 ClassTemplateDecl *Template = 0; 5576 const TemplateArgument *Arguments = 0; 5577 5578 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5579 5580 ClassTemplateSpecializationDecl *Specialization = 5581 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5582 if (!Specialization) 5583 return false; 5584 5585 Template = Specialization->getSpecializedTemplate(); 5586 Arguments = Specialization->getTemplateArgs().data(); 5587 } else if (const TemplateSpecializationType *TST = 5588 Ty->getAs<TemplateSpecializationType>()) { 5589 Template = dyn_cast_or_null<ClassTemplateDecl>( 5590 TST->getTemplateName().getAsTemplateDecl()); 5591 Arguments = TST->getArgs(); 5592 } 5593 if (!Template) 5594 return false; 5595 5596 if (!StdInitializerList) { 5597 // Haven't recognized std::initializer_list yet, maybe this is it. 5598 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5599 if (TemplateClass->getIdentifier() != 5600 &PP.getIdentifierTable().get("initializer_list") || 5601 !getStdNamespace()->InEnclosingNamespaceSetOf( 5602 TemplateClass->getDeclContext())) 5603 return false; 5604 // This is a template called std::initializer_list, but is it the right 5605 // template? 5606 TemplateParameterList *Params = Template->getTemplateParameters(); 5607 if (Params->getMinRequiredArguments() != 1) 5608 return false; 5609 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5610 return false; 5611 5612 // It's the right template. 5613 StdInitializerList = Template; 5614 } 5615 5616 if (Template != StdInitializerList) 5617 return false; 5618 5619 // This is an instance of std::initializer_list. Find the argument type. 5620 if (Element) 5621 *Element = Arguments[0].getAsType(); 5622 return true; 5623} 5624 5625static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5626 NamespaceDecl *Std = S.getStdNamespace(); 5627 if (!Std) { 5628 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5629 return 0; 5630 } 5631 5632 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5633 Loc, Sema::LookupOrdinaryName); 5634 if (!S.LookupQualifiedName(Result, Std)) { 5635 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5636 return 0; 5637 } 5638 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5639 if (!Template) { 5640 Result.suppressDiagnostics(); 5641 // We found something weird. Complain about the first thing we found. 5642 NamedDecl *Found = *Result.begin(); 5643 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5644 return 0; 5645 } 5646 5647 // We found some template called std::initializer_list. Now verify that it's 5648 // correct. 5649 TemplateParameterList *Params = Template->getTemplateParameters(); 5650 if (Params->getMinRequiredArguments() != 1 || 5651 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5652 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5653 return 0; 5654 } 5655 5656 return Template; 5657} 5658 5659QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5660 if (!StdInitializerList) { 5661 StdInitializerList = LookupStdInitializerList(*this, Loc); 5662 if (!StdInitializerList) 5663 return QualType(); 5664 } 5665 5666 TemplateArgumentListInfo Args(Loc, Loc); 5667 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5668 Context.getTrivialTypeSourceInfo(Element, 5669 Loc))); 5670 return Context.getCanonicalType( 5671 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5672} 5673 5674bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5675 // C++ [dcl.init.list]p2: 5676 // A constructor is an initializer-list constructor if its first parameter 5677 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5678 // std::initializer_list<E> for some type E, and either there are no other 5679 // parameters or else all other parameters have default arguments. 5680 if (Ctor->getNumParams() < 1 || 5681 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5682 return false; 5683 5684 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5685 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5686 ArgType = RT->getPointeeType().getUnqualifiedType(); 5687 5688 return isStdInitializerList(ArgType, 0); 5689} 5690 5691/// \brief Determine whether a using statement is in a context where it will be 5692/// apply in all contexts. 5693static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5694 switch (CurContext->getDeclKind()) { 5695 case Decl::TranslationUnit: 5696 return true; 5697 case Decl::LinkageSpec: 5698 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5699 default: 5700 return false; 5701 } 5702} 5703 5704namespace { 5705 5706// Callback to only accept typo corrections that are namespaces. 5707class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5708 public: 5709 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5710 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5711 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5712 } 5713 return false; 5714 } 5715}; 5716 5717} 5718 5719static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5720 CXXScopeSpec &SS, 5721 SourceLocation IdentLoc, 5722 IdentifierInfo *Ident) { 5723 NamespaceValidatorCCC Validator; 5724 R.clear(); 5725 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5726 R.getLookupKind(), Sc, &SS, 5727 Validator)) { 5728 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5729 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5730 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5731 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5732 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5733 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5734 else 5735 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5736 << Ident << CorrectedQuotedStr 5737 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5738 5739 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5740 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5741 5742 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5743 R.addDecl(Corrected.getCorrectionDecl()); 5744 return true; 5745 } 5746 return false; 5747} 5748 5749Decl *Sema::ActOnUsingDirective(Scope *S, 5750 SourceLocation UsingLoc, 5751 SourceLocation NamespcLoc, 5752 CXXScopeSpec &SS, 5753 SourceLocation IdentLoc, 5754 IdentifierInfo *NamespcName, 5755 AttributeList *AttrList) { 5756 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5757 assert(NamespcName && "Invalid NamespcName."); 5758 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5759 5760 // This can only happen along a recovery path. 5761 while (S->getFlags() & Scope::TemplateParamScope) 5762 S = S->getParent(); 5763 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5764 5765 UsingDirectiveDecl *UDir = 0; 5766 NestedNameSpecifier *Qualifier = 0; 5767 if (SS.isSet()) 5768 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5769 5770 // Lookup namespace name. 5771 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5772 LookupParsedName(R, S, &SS); 5773 if (R.isAmbiguous()) 5774 return 0; 5775 5776 if (R.empty()) { 5777 R.clear(); 5778 // Allow "using namespace std;" or "using namespace ::std;" even if 5779 // "std" hasn't been defined yet, for GCC compatibility. 5780 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5781 NamespcName->isStr("std")) { 5782 Diag(IdentLoc, diag::ext_using_undefined_std); 5783 R.addDecl(getOrCreateStdNamespace()); 5784 R.resolveKind(); 5785 } 5786 // Otherwise, attempt typo correction. 5787 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5788 } 5789 5790 if (!R.empty()) { 5791 NamedDecl *Named = R.getFoundDecl(); 5792 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5793 && "expected namespace decl"); 5794 // C++ [namespace.udir]p1: 5795 // A using-directive specifies that the names in the nominated 5796 // namespace can be used in the scope in which the 5797 // using-directive appears after the using-directive. During 5798 // unqualified name lookup (3.4.1), the names appear as if they 5799 // were declared in the nearest enclosing namespace which 5800 // contains both the using-directive and the nominated 5801 // namespace. [Note: in this context, "contains" means "contains 5802 // directly or indirectly". ] 5803 5804 // Find enclosing context containing both using-directive and 5805 // nominated namespace. 5806 NamespaceDecl *NS = getNamespaceDecl(Named); 5807 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5808 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5809 CommonAncestor = CommonAncestor->getParent(); 5810 5811 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5812 SS.getWithLocInContext(Context), 5813 IdentLoc, Named, CommonAncestor); 5814 5815 if (IsUsingDirectiveInToplevelContext(CurContext) && 5816 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5817 Diag(IdentLoc, diag::warn_using_directive_in_header); 5818 } 5819 5820 PushUsingDirective(S, UDir); 5821 } else { 5822 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5823 } 5824 5825 // FIXME: We ignore attributes for now. 5826 return UDir; 5827} 5828 5829void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5830 // If scope has associated entity, then using directive is at namespace 5831 // or translation unit scope. We add UsingDirectiveDecls, into 5832 // it's lookup structure. 5833 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5834 Ctx->addDecl(UDir); 5835 else 5836 // Otherwise it is block-sope. using-directives will affect lookup 5837 // only to the end of scope. 5838 S->PushUsingDirective(UDir); 5839} 5840 5841 5842Decl *Sema::ActOnUsingDeclaration(Scope *S, 5843 AccessSpecifier AS, 5844 bool HasUsingKeyword, 5845 SourceLocation UsingLoc, 5846 CXXScopeSpec &SS, 5847 UnqualifiedId &Name, 5848 AttributeList *AttrList, 5849 bool IsTypeName, 5850 SourceLocation TypenameLoc) { 5851 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5852 5853 switch (Name.getKind()) { 5854 case UnqualifiedId::IK_ImplicitSelfParam: 5855 case UnqualifiedId::IK_Identifier: 5856 case UnqualifiedId::IK_OperatorFunctionId: 5857 case UnqualifiedId::IK_LiteralOperatorId: 5858 case UnqualifiedId::IK_ConversionFunctionId: 5859 break; 5860 5861 case UnqualifiedId::IK_ConstructorName: 5862 case UnqualifiedId::IK_ConstructorTemplateId: 5863 // C++0x inherited constructors. 5864 Diag(Name.getSourceRange().getBegin(), 5865 getLangOptions().CPlusPlus0x ? 5866 diag::warn_cxx98_compat_using_decl_constructor : 5867 diag::err_using_decl_constructor) 5868 << SS.getRange(); 5869 5870 if (getLangOptions().CPlusPlus0x) break; 5871 5872 return 0; 5873 5874 case UnqualifiedId::IK_DestructorName: 5875 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5876 << SS.getRange(); 5877 return 0; 5878 5879 case UnqualifiedId::IK_TemplateId: 5880 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5881 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5882 return 0; 5883 } 5884 5885 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5886 DeclarationName TargetName = TargetNameInfo.getName(); 5887 if (!TargetName) 5888 return 0; 5889 5890 // Warn about using declarations. 5891 // TODO: store that the declaration was written without 'using' and 5892 // talk about access decls instead of using decls in the 5893 // diagnostics. 5894 if (!HasUsingKeyword) { 5895 UsingLoc = Name.getSourceRange().getBegin(); 5896 5897 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5898 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5899 } 5900 5901 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5902 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5903 return 0; 5904 5905 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5906 TargetNameInfo, AttrList, 5907 /* IsInstantiation */ false, 5908 IsTypeName, TypenameLoc); 5909 if (UD) 5910 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5911 5912 return UD; 5913} 5914 5915/// \brief Determine whether a using declaration considers the given 5916/// declarations as "equivalent", e.g., if they are redeclarations of 5917/// the same entity or are both typedefs of the same type. 5918static bool 5919IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5920 bool &SuppressRedeclaration) { 5921 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5922 SuppressRedeclaration = false; 5923 return true; 5924 } 5925 5926 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5927 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5928 SuppressRedeclaration = true; 5929 return Context.hasSameType(TD1->getUnderlyingType(), 5930 TD2->getUnderlyingType()); 5931 } 5932 5933 return false; 5934} 5935 5936 5937/// Determines whether to create a using shadow decl for a particular 5938/// decl, given the set of decls existing prior to this using lookup. 5939bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5940 const LookupResult &Previous) { 5941 // Diagnose finding a decl which is not from a base class of the 5942 // current class. We do this now because there are cases where this 5943 // function will silently decide not to build a shadow decl, which 5944 // will pre-empt further diagnostics. 5945 // 5946 // We don't need to do this in C++0x because we do the check once on 5947 // the qualifier. 5948 // 5949 // FIXME: diagnose the following if we care enough: 5950 // struct A { int foo; }; 5951 // struct B : A { using A::foo; }; 5952 // template <class T> struct C : A {}; 5953 // template <class T> struct D : C<T> { using B::foo; } // <--- 5954 // This is invalid (during instantiation) in C++03 because B::foo 5955 // resolves to the using decl in B, which is not a base class of D<T>. 5956 // We can't diagnose it immediately because C<T> is an unknown 5957 // specialization. The UsingShadowDecl in D<T> then points directly 5958 // to A::foo, which will look well-formed when we instantiate. 5959 // The right solution is to not collapse the shadow-decl chain. 5960 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5961 DeclContext *OrigDC = Orig->getDeclContext(); 5962 5963 // Handle enums and anonymous structs. 5964 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5965 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5966 while (OrigRec->isAnonymousStructOrUnion()) 5967 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5968 5969 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5970 if (OrigDC == CurContext) { 5971 Diag(Using->getLocation(), 5972 diag::err_using_decl_nested_name_specifier_is_current_class) 5973 << Using->getQualifierLoc().getSourceRange(); 5974 Diag(Orig->getLocation(), diag::note_using_decl_target); 5975 return true; 5976 } 5977 5978 Diag(Using->getQualifierLoc().getBeginLoc(), 5979 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5980 << Using->getQualifier() 5981 << cast<CXXRecordDecl>(CurContext) 5982 << Using->getQualifierLoc().getSourceRange(); 5983 Diag(Orig->getLocation(), diag::note_using_decl_target); 5984 return true; 5985 } 5986 } 5987 5988 if (Previous.empty()) return false; 5989 5990 NamedDecl *Target = Orig; 5991 if (isa<UsingShadowDecl>(Target)) 5992 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5993 5994 // If the target happens to be one of the previous declarations, we 5995 // don't have a conflict. 5996 // 5997 // FIXME: but we might be increasing its access, in which case we 5998 // should redeclare it. 5999 NamedDecl *NonTag = 0, *Tag = 0; 6000 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6001 I != E; ++I) { 6002 NamedDecl *D = (*I)->getUnderlyingDecl(); 6003 bool Result; 6004 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6005 return Result; 6006 6007 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6008 } 6009 6010 if (Target->isFunctionOrFunctionTemplate()) { 6011 FunctionDecl *FD; 6012 if (isa<FunctionTemplateDecl>(Target)) 6013 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6014 else 6015 FD = cast<FunctionDecl>(Target); 6016 6017 NamedDecl *OldDecl = 0; 6018 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6019 case Ovl_Overload: 6020 return false; 6021 6022 case Ovl_NonFunction: 6023 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6024 break; 6025 6026 // We found a decl with the exact signature. 6027 case Ovl_Match: 6028 // If we're in a record, we want to hide the target, so we 6029 // return true (without a diagnostic) to tell the caller not to 6030 // build a shadow decl. 6031 if (CurContext->isRecord()) 6032 return true; 6033 6034 // If we're not in a record, this is an error. 6035 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6036 break; 6037 } 6038 6039 Diag(Target->getLocation(), diag::note_using_decl_target); 6040 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6041 return true; 6042 } 6043 6044 // Target is not a function. 6045 6046 if (isa<TagDecl>(Target)) { 6047 // No conflict between a tag and a non-tag. 6048 if (!Tag) return false; 6049 6050 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6051 Diag(Target->getLocation(), diag::note_using_decl_target); 6052 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6053 return true; 6054 } 6055 6056 // No conflict between a tag and a non-tag. 6057 if (!NonTag) return false; 6058 6059 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6060 Diag(Target->getLocation(), diag::note_using_decl_target); 6061 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6062 return true; 6063} 6064 6065/// Builds a shadow declaration corresponding to a 'using' declaration. 6066UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6067 UsingDecl *UD, 6068 NamedDecl *Orig) { 6069 6070 // If we resolved to another shadow declaration, just coalesce them. 6071 NamedDecl *Target = Orig; 6072 if (isa<UsingShadowDecl>(Target)) { 6073 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6074 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6075 } 6076 6077 UsingShadowDecl *Shadow 6078 = UsingShadowDecl::Create(Context, CurContext, 6079 UD->getLocation(), UD, Target); 6080 UD->addShadowDecl(Shadow); 6081 6082 Shadow->setAccess(UD->getAccess()); 6083 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6084 Shadow->setInvalidDecl(); 6085 6086 if (S) 6087 PushOnScopeChains(Shadow, S); 6088 else 6089 CurContext->addDecl(Shadow); 6090 6091 6092 return Shadow; 6093} 6094 6095/// Hides a using shadow declaration. This is required by the current 6096/// using-decl implementation when a resolvable using declaration in a 6097/// class is followed by a declaration which would hide or override 6098/// one or more of the using decl's targets; for example: 6099/// 6100/// struct Base { void foo(int); }; 6101/// struct Derived : Base { 6102/// using Base::foo; 6103/// void foo(int); 6104/// }; 6105/// 6106/// The governing language is C++03 [namespace.udecl]p12: 6107/// 6108/// When a using-declaration brings names from a base class into a 6109/// derived class scope, member functions in the derived class 6110/// override and/or hide member functions with the same name and 6111/// parameter types in a base class (rather than conflicting). 6112/// 6113/// There are two ways to implement this: 6114/// (1) optimistically create shadow decls when they're not hidden 6115/// by existing declarations, or 6116/// (2) don't create any shadow decls (or at least don't make them 6117/// visible) until we've fully parsed/instantiated the class. 6118/// The problem with (1) is that we might have to retroactively remove 6119/// a shadow decl, which requires several O(n) operations because the 6120/// decl structures are (very reasonably) not designed for removal. 6121/// (2) avoids this but is very fiddly and phase-dependent. 6122void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6123 if (Shadow->getDeclName().getNameKind() == 6124 DeclarationName::CXXConversionFunctionName) 6125 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6126 6127 // Remove it from the DeclContext... 6128 Shadow->getDeclContext()->removeDecl(Shadow); 6129 6130 // ...and the scope, if applicable... 6131 if (S) { 6132 S->RemoveDecl(Shadow); 6133 IdResolver.RemoveDecl(Shadow); 6134 } 6135 6136 // ...and the using decl. 6137 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6138 6139 // TODO: complain somehow if Shadow was used. It shouldn't 6140 // be possible for this to happen, because...? 6141} 6142 6143/// Builds a using declaration. 6144/// 6145/// \param IsInstantiation - Whether this call arises from an 6146/// instantiation of an unresolved using declaration. We treat 6147/// the lookup differently for these declarations. 6148NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6149 SourceLocation UsingLoc, 6150 CXXScopeSpec &SS, 6151 const DeclarationNameInfo &NameInfo, 6152 AttributeList *AttrList, 6153 bool IsInstantiation, 6154 bool IsTypeName, 6155 SourceLocation TypenameLoc) { 6156 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6157 SourceLocation IdentLoc = NameInfo.getLoc(); 6158 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6159 6160 // FIXME: We ignore attributes for now. 6161 6162 if (SS.isEmpty()) { 6163 Diag(IdentLoc, diag::err_using_requires_qualname); 6164 return 0; 6165 } 6166 6167 // Do the redeclaration lookup in the current scope. 6168 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6169 ForRedeclaration); 6170 Previous.setHideTags(false); 6171 if (S) { 6172 LookupName(Previous, S); 6173 6174 // It is really dumb that we have to do this. 6175 LookupResult::Filter F = Previous.makeFilter(); 6176 while (F.hasNext()) { 6177 NamedDecl *D = F.next(); 6178 if (!isDeclInScope(D, CurContext, S)) 6179 F.erase(); 6180 } 6181 F.done(); 6182 } else { 6183 assert(IsInstantiation && "no scope in non-instantiation"); 6184 assert(CurContext->isRecord() && "scope not record in instantiation"); 6185 LookupQualifiedName(Previous, CurContext); 6186 } 6187 6188 // Check for invalid redeclarations. 6189 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6190 return 0; 6191 6192 // Check for bad qualifiers. 6193 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6194 return 0; 6195 6196 DeclContext *LookupContext = computeDeclContext(SS); 6197 NamedDecl *D; 6198 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6199 if (!LookupContext) { 6200 if (IsTypeName) { 6201 // FIXME: not all declaration name kinds are legal here 6202 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6203 UsingLoc, TypenameLoc, 6204 QualifierLoc, 6205 IdentLoc, NameInfo.getName()); 6206 } else { 6207 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6208 QualifierLoc, NameInfo); 6209 } 6210 } else { 6211 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6212 NameInfo, IsTypeName); 6213 } 6214 D->setAccess(AS); 6215 CurContext->addDecl(D); 6216 6217 if (!LookupContext) return D; 6218 UsingDecl *UD = cast<UsingDecl>(D); 6219 6220 if (RequireCompleteDeclContext(SS, LookupContext)) { 6221 UD->setInvalidDecl(); 6222 return UD; 6223 } 6224 6225 // Constructor inheriting using decls get special treatment. 6226 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6227 if (CheckInheritedConstructorUsingDecl(UD)) 6228 UD->setInvalidDecl(); 6229 return UD; 6230 } 6231 6232 // Otherwise, look up the target name. 6233 6234 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6235 6236 // Unlike most lookups, we don't always want to hide tag 6237 // declarations: tag names are visible through the using declaration 6238 // even if hidden by ordinary names, *except* in a dependent context 6239 // where it's important for the sanity of two-phase lookup. 6240 if (!IsInstantiation) 6241 R.setHideTags(false); 6242 6243 LookupQualifiedName(R, LookupContext); 6244 6245 if (R.empty()) { 6246 Diag(IdentLoc, diag::err_no_member) 6247 << NameInfo.getName() << LookupContext << SS.getRange(); 6248 UD->setInvalidDecl(); 6249 return UD; 6250 } 6251 6252 if (R.isAmbiguous()) { 6253 UD->setInvalidDecl(); 6254 return UD; 6255 } 6256 6257 if (IsTypeName) { 6258 // If we asked for a typename and got a non-type decl, error out. 6259 if (!R.getAsSingle<TypeDecl>()) { 6260 Diag(IdentLoc, diag::err_using_typename_non_type); 6261 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6262 Diag((*I)->getUnderlyingDecl()->getLocation(), 6263 diag::note_using_decl_target); 6264 UD->setInvalidDecl(); 6265 return UD; 6266 } 6267 } else { 6268 // If we asked for a non-typename and we got a type, error out, 6269 // but only if this is an instantiation of an unresolved using 6270 // decl. Otherwise just silently find the type name. 6271 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6272 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6273 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6274 UD->setInvalidDecl(); 6275 return UD; 6276 } 6277 } 6278 6279 // C++0x N2914 [namespace.udecl]p6: 6280 // A using-declaration shall not name a namespace. 6281 if (R.getAsSingle<NamespaceDecl>()) { 6282 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6283 << SS.getRange(); 6284 UD->setInvalidDecl(); 6285 return UD; 6286 } 6287 6288 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6289 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6290 BuildUsingShadowDecl(S, UD, *I); 6291 } 6292 6293 return UD; 6294} 6295 6296/// Additional checks for a using declaration referring to a constructor name. 6297bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6298 if (UD->isTypeName()) { 6299 // FIXME: Cannot specify typename when specifying constructor 6300 return true; 6301 } 6302 6303 const Type *SourceType = UD->getQualifier()->getAsType(); 6304 assert(SourceType && 6305 "Using decl naming constructor doesn't have type in scope spec."); 6306 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6307 6308 // Check whether the named type is a direct base class. 6309 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6310 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6311 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6312 BaseIt != BaseE; ++BaseIt) { 6313 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6314 if (CanonicalSourceType == BaseType) 6315 break; 6316 } 6317 6318 if (BaseIt == BaseE) { 6319 // Did not find SourceType in the bases. 6320 Diag(UD->getUsingLocation(), 6321 diag::err_using_decl_constructor_not_in_direct_base) 6322 << UD->getNameInfo().getSourceRange() 6323 << QualType(SourceType, 0) << TargetClass; 6324 return true; 6325 } 6326 6327 BaseIt->setInheritConstructors(); 6328 6329 return false; 6330} 6331 6332/// Checks that the given using declaration is not an invalid 6333/// redeclaration. Note that this is checking only for the using decl 6334/// itself, not for any ill-formedness among the UsingShadowDecls. 6335bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6336 bool isTypeName, 6337 const CXXScopeSpec &SS, 6338 SourceLocation NameLoc, 6339 const LookupResult &Prev) { 6340 // C++03 [namespace.udecl]p8: 6341 // C++0x [namespace.udecl]p10: 6342 // A using-declaration is a declaration and can therefore be used 6343 // repeatedly where (and only where) multiple declarations are 6344 // allowed. 6345 // 6346 // That's in non-member contexts. 6347 if (!CurContext->getRedeclContext()->isRecord()) 6348 return false; 6349 6350 NestedNameSpecifier *Qual 6351 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6352 6353 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6354 NamedDecl *D = *I; 6355 6356 bool DTypename; 6357 NestedNameSpecifier *DQual; 6358 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6359 DTypename = UD->isTypeName(); 6360 DQual = UD->getQualifier(); 6361 } else if (UnresolvedUsingValueDecl *UD 6362 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6363 DTypename = false; 6364 DQual = UD->getQualifier(); 6365 } else if (UnresolvedUsingTypenameDecl *UD 6366 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6367 DTypename = true; 6368 DQual = UD->getQualifier(); 6369 } else continue; 6370 6371 // using decls differ if one says 'typename' and the other doesn't. 6372 // FIXME: non-dependent using decls? 6373 if (isTypeName != DTypename) continue; 6374 6375 // using decls differ if they name different scopes (but note that 6376 // template instantiation can cause this check to trigger when it 6377 // didn't before instantiation). 6378 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6379 Context.getCanonicalNestedNameSpecifier(DQual)) 6380 continue; 6381 6382 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6383 Diag(D->getLocation(), diag::note_using_decl) << 1; 6384 return true; 6385 } 6386 6387 return false; 6388} 6389 6390 6391/// Checks that the given nested-name qualifier used in a using decl 6392/// in the current context is appropriately related to the current 6393/// scope. If an error is found, diagnoses it and returns true. 6394bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6395 const CXXScopeSpec &SS, 6396 SourceLocation NameLoc) { 6397 DeclContext *NamedContext = computeDeclContext(SS); 6398 6399 if (!CurContext->isRecord()) { 6400 // C++03 [namespace.udecl]p3: 6401 // C++0x [namespace.udecl]p8: 6402 // A using-declaration for a class member shall be a member-declaration. 6403 6404 // If we weren't able to compute a valid scope, it must be a 6405 // dependent class scope. 6406 if (!NamedContext || NamedContext->isRecord()) { 6407 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6408 << SS.getRange(); 6409 return true; 6410 } 6411 6412 // Otherwise, everything is known to be fine. 6413 return false; 6414 } 6415 6416 // The current scope is a record. 6417 6418 // If the named context is dependent, we can't decide much. 6419 if (!NamedContext) { 6420 // FIXME: in C++0x, we can diagnose if we can prove that the 6421 // nested-name-specifier does not refer to a base class, which is 6422 // still possible in some cases. 6423 6424 // Otherwise we have to conservatively report that things might be 6425 // okay. 6426 return false; 6427 } 6428 6429 if (!NamedContext->isRecord()) { 6430 // Ideally this would point at the last name in the specifier, 6431 // but we don't have that level of source info. 6432 Diag(SS.getRange().getBegin(), 6433 diag::err_using_decl_nested_name_specifier_is_not_class) 6434 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6435 return true; 6436 } 6437 6438 if (!NamedContext->isDependentContext() && 6439 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6440 return true; 6441 6442 if (getLangOptions().CPlusPlus0x) { 6443 // C++0x [namespace.udecl]p3: 6444 // In a using-declaration used as a member-declaration, the 6445 // nested-name-specifier shall name a base class of the class 6446 // being defined. 6447 6448 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6449 cast<CXXRecordDecl>(NamedContext))) { 6450 if (CurContext == NamedContext) { 6451 Diag(NameLoc, 6452 diag::err_using_decl_nested_name_specifier_is_current_class) 6453 << SS.getRange(); 6454 return true; 6455 } 6456 6457 Diag(SS.getRange().getBegin(), 6458 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6459 << (NestedNameSpecifier*) SS.getScopeRep() 6460 << cast<CXXRecordDecl>(CurContext) 6461 << SS.getRange(); 6462 return true; 6463 } 6464 6465 return false; 6466 } 6467 6468 // C++03 [namespace.udecl]p4: 6469 // A using-declaration used as a member-declaration shall refer 6470 // to a member of a base class of the class being defined [etc.]. 6471 6472 // Salient point: SS doesn't have to name a base class as long as 6473 // lookup only finds members from base classes. Therefore we can 6474 // diagnose here only if we can prove that that can't happen, 6475 // i.e. if the class hierarchies provably don't intersect. 6476 6477 // TODO: it would be nice if "definitely valid" results were cached 6478 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6479 // need to be repeated. 6480 6481 struct UserData { 6482 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6483 6484 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6485 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6486 Data->Bases.insert(Base); 6487 return true; 6488 } 6489 6490 bool hasDependentBases(const CXXRecordDecl *Class) { 6491 return !Class->forallBases(collect, this); 6492 } 6493 6494 /// Returns true if the base is dependent or is one of the 6495 /// accumulated base classes. 6496 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6497 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6498 return !Data->Bases.count(Base); 6499 } 6500 6501 bool mightShareBases(const CXXRecordDecl *Class) { 6502 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6503 } 6504 }; 6505 6506 UserData Data; 6507 6508 // Returns false if we find a dependent base. 6509 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6510 return false; 6511 6512 // Returns false if the class has a dependent base or if it or one 6513 // of its bases is present in the base set of the current context. 6514 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6515 return false; 6516 6517 Diag(SS.getRange().getBegin(), 6518 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6519 << (NestedNameSpecifier*) SS.getScopeRep() 6520 << cast<CXXRecordDecl>(CurContext) 6521 << SS.getRange(); 6522 6523 return true; 6524} 6525 6526Decl *Sema::ActOnAliasDeclaration(Scope *S, 6527 AccessSpecifier AS, 6528 MultiTemplateParamsArg TemplateParamLists, 6529 SourceLocation UsingLoc, 6530 UnqualifiedId &Name, 6531 TypeResult Type) { 6532 // Skip up to the relevant declaration scope. 6533 while (S->getFlags() & Scope::TemplateParamScope) 6534 S = S->getParent(); 6535 assert((S->getFlags() & Scope::DeclScope) && 6536 "got alias-declaration outside of declaration scope"); 6537 6538 if (Type.isInvalid()) 6539 return 0; 6540 6541 bool Invalid = false; 6542 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6543 TypeSourceInfo *TInfo = 0; 6544 GetTypeFromParser(Type.get(), &TInfo); 6545 6546 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6547 return 0; 6548 6549 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6550 UPPC_DeclarationType)) { 6551 Invalid = true; 6552 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6553 TInfo->getTypeLoc().getBeginLoc()); 6554 } 6555 6556 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6557 LookupName(Previous, S); 6558 6559 // Warn about shadowing the name of a template parameter. 6560 if (Previous.isSingleResult() && 6561 Previous.getFoundDecl()->isTemplateParameter()) { 6562 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6563 Previous.clear(); 6564 } 6565 6566 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6567 "name in alias declaration must be an identifier"); 6568 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6569 Name.StartLocation, 6570 Name.Identifier, TInfo); 6571 6572 NewTD->setAccess(AS); 6573 6574 if (Invalid) 6575 NewTD->setInvalidDecl(); 6576 6577 CheckTypedefForVariablyModifiedType(S, NewTD); 6578 Invalid |= NewTD->isInvalidDecl(); 6579 6580 bool Redeclaration = false; 6581 6582 NamedDecl *NewND; 6583 if (TemplateParamLists.size()) { 6584 TypeAliasTemplateDecl *OldDecl = 0; 6585 TemplateParameterList *OldTemplateParams = 0; 6586 6587 if (TemplateParamLists.size() != 1) { 6588 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6589 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6590 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6591 } 6592 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6593 6594 // Only consider previous declarations in the same scope. 6595 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6596 /*ExplicitInstantiationOrSpecialization*/false); 6597 if (!Previous.empty()) { 6598 Redeclaration = true; 6599 6600 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6601 if (!OldDecl && !Invalid) { 6602 Diag(UsingLoc, diag::err_redefinition_different_kind) 6603 << Name.Identifier; 6604 6605 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6606 if (OldD->getLocation().isValid()) 6607 Diag(OldD->getLocation(), diag::note_previous_definition); 6608 6609 Invalid = true; 6610 } 6611 6612 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6613 if (TemplateParameterListsAreEqual(TemplateParams, 6614 OldDecl->getTemplateParameters(), 6615 /*Complain=*/true, 6616 TPL_TemplateMatch)) 6617 OldTemplateParams = OldDecl->getTemplateParameters(); 6618 else 6619 Invalid = true; 6620 6621 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6622 if (!Invalid && 6623 !Context.hasSameType(OldTD->getUnderlyingType(), 6624 NewTD->getUnderlyingType())) { 6625 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6626 // but we can't reasonably accept it. 6627 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6628 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6629 if (OldTD->getLocation().isValid()) 6630 Diag(OldTD->getLocation(), diag::note_previous_definition); 6631 Invalid = true; 6632 } 6633 } 6634 } 6635 6636 // Merge any previous default template arguments into our parameters, 6637 // and check the parameter list. 6638 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6639 TPC_TypeAliasTemplate)) 6640 return 0; 6641 6642 TypeAliasTemplateDecl *NewDecl = 6643 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6644 Name.Identifier, TemplateParams, 6645 NewTD); 6646 6647 NewDecl->setAccess(AS); 6648 6649 if (Invalid) 6650 NewDecl->setInvalidDecl(); 6651 else if (OldDecl) 6652 NewDecl->setPreviousDeclaration(OldDecl); 6653 6654 NewND = NewDecl; 6655 } else { 6656 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6657 NewND = NewTD; 6658 } 6659 6660 if (!Redeclaration) 6661 PushOnScopeChains(NewND, S); 6662 6663 return NewND; 6664} 6665 6666Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6667 SourceLocation NamespaceLoc, 6668 SourceLocation AliasLoc, 6669 IdentifierInfo *Alias, 6670 CXXScopeSpec &SS, 6671 SourceLocation IdentLoc, 6672 IdentifierInfo *Ident) { 6673 6674 // Lookup the namespace name. 6675 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6676 LookupParsedName(R, S, &SS); 6677 6678 // Check if we have a previous declaration with the same name. 6679 NamedDecl *PrevDecl 6680 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6681 ForRedeclaration); 6682 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6683 PrevDecl = 0; 6684 6685 if (PrevDecl) { 6686 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6687 // We already have an alias with the same name that points to the same 6688 // namespace, so don't create a new one. 6689 // FIXME: At some point, we'll want to create the (redundant) 6690 // declaration to maintain better source information. 6691 if (!R.isAmbiguous() && !R.empty() && 6692 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6693 return 0; 6694 } 6695 6696 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6697 diag::err_redefinition_different_kind; 6698 Diag(AliasLoc, DiagID) << Alias; 6699 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6700 return 0; 6701 } 6702 6703 if (R.isAmbiguous()) 6704 return 0; 6705 6706 if (R.empty()) { 6707 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6708 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6709 return 0; 6710 } 6711 } 6712 6713 NamespaceAliasDecl *AliasDecl = 6714 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6715 Alias, SS.getWithLocInContext(Context), 6716 IdentLoc, R.getFoundDecl()); 6717 6718 PushOnScopeChains(AliasDecl, S); 6719 return AliasDecl; 6720} 6721 6722namespace { 6723 /// \brief Scoped object used to handle the state changes required in Sema 6724 /// to implicitly define the body of a C++ member function; 6725 class ImplicitlyDefinedFunctionScope { 6726 Sema &S; 6727 Sema::ContextRAII SavedContext; 6728 6729 public: 6730 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6731 : S(S), SavedContext(S, Method) 6732 { 6733 S.PushFunctionScope(); 6734 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6735 } 6736 6737 ~ImplicitlyDefinedFunctionScope() { 6738 S.PopExpressionEvaluationContext(); 6739 S.PopFunctionScopeInfo(); 6740 } 6741 }; 6742} 6743 6744Sema::ImplicitExceptionSpecification 6745Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6746 // C++ [except.spec]p14: 6747 // An implicitly declared special member function (Clause 12) shall have an 6748 // exception-specification. [...] 6749 ImplicitExceptionSpecification ExceptSpec(Context); 6750 if (ClassDecl->isInvalidDecl()) 6751 return ExceptSpec; 6752 6753 // Direct base-class constructors. 6754 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6755 BEnd = ClassDecl->bases_end(); 6756 B != BEnd; ++B) { 6757 if (B->isVirtual()) // Handled below. 6758 continue; 6759 6760 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6761 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6762 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6763 // If this is a deleted function, add it anyway. This might be conformant 6764 // with the standard. This might not. I'm not sure. It might not matter. 6765 if (Constructor) 6766 ExceptSpec.CalledDecl(Constructor); 6767 } 6768 } 6769 6770 // Virtual base-class constructors. 6771 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6772 BEnd = ClassDecl->vbases_end(); 6773 B != BEnd; ++B) { 6774 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6775 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6776 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6777 // If this is a deleted function, add it anyway. This might be conformant 6778 // with the standard. This might not. I'm not sure. It might not matter. 6779 if (Constructor) 6780 ExceptSpec.CalledDecl(Constructor); 6781 } 6782 } 6783 6784 // Field constructors. 6785 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6786 FEnd = ClassDecl->field_end(); 6787 F != FEnd; ++F) { 6788 if (F->hasInClassInitializer()) { 6789 if (Expr *E = F->getInClassInitializer()) 6790 ExceptSpec.CalledExpr(E); 6791 else if (!F->isInvalidDecl()) 6792 ExceptSpec.SetDelayed(); 6793 } else if (const RecordType *RecordTy 6794 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6795 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6796 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6797 // If this is a deleted function, add it anyway. This might be conformant 6798 // with the standard. This might not. I'm not sure. It might not matter. 6799 // In particular, the problem is that this function never gets called. It 6800 // might just be ill-formed because this function attempts to refer to 6801 // a deleted function here. 6802 if (Constructor) 6803 ExceptSpec.CalledDecl(Constructor); 6804 } 6805 } 6806 6807 return ExceptSpec; 6808} 6809 6810CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6811 CXXRecordDecl *ClassDecl) { 6812 // C++ [class.ctor]p5: 6813 // A default constructor for a class X is a constructor of class X 6814 // that can be called without an argument. If there is no 6815 // user-declared constructor for class X, a default constructor is 6816 // implicitly declared. An implicitly-declared default constructor 6817 // is an inline public member of its class. 6818 assert(!ClassDecl->hasUserDeclaredConstructor() && 6819 "Should not build implicit default constructor!"); 6820 6821 ImplicitExceptionSpecification Spec = 6822 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6823 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6824 6825 // Create the actual constructor declaration. 6826 CanQualType ClassType 6827 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6828 SourceLocation ClassLoc = ClassDecl->getLocation(); 6829 DeclarationName Name 6830 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6831 DeclarationNameInfo NameInfo(Name, ClassLoc); 6832 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6833 Context, ClassDecl, ClassLoc, NameInfo, 6834 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6835 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6836 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 6837 getLangOptions().CPlusPlus0x); 6838 DefaultCon->setAccess(AS_public); 6839 DefaultCon->setDefaulted(); 6840 DefaultCon->setImplicit(); 6841 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6842 6843 // Note that we have declared this constructor. 6844 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6845 6846 if (Scope *S = getScopeForContext(ClassDecl)) 6847 PushOnScopeChains(DefaultCon, S, false); 6848 ClassDecl->addDecl(DefaultCon); 6849 6850 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6851 DefaultCon->setDeletedAsWritten(); 6852 6853 return DefaultCon; 6854} 6855 6856void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6857 CXXConstructorDecl *Constructor) { 6858 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6859 !Constructor->doesThisDeclarationHaveABody() && 6860 !Constructor->isDeleted()) && 6861 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6862 6863 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6864 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6865 6866 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6867 DiagnosticErrorTrap Trap(Diags); 6868 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6869 Trap.hasErrorOccurred()) { 6870 Diag(CurrentLocation, diag::note_member_synthesized_at) 6871 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6872 Constructor->setInvalidDecl(); 6873 return; 6874 } 6875 6876 SourceLocation Loc = Constructor->getLocation(); 6877 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6878 6879 Constructor->setUsed(); 6880 MarkVTableUsed(CurrentLocation, ClassDecl); 6881 6882 if (ASTMutationListener *L = getASTMutationListener()) { 6883 L->CompletedImplicitDefinition(Constructor); 6884 } 6885} 6886 6887/// Get any existing defaulted default constructor for the given class. Do not 6888/// implicitly define one if it does not exist. 6889static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6890 CXXRecordDecl *D) { 6891 ASTContext &Context = Self.Context; 6892 QualType ClassType = Context.getTypeDeclType(D); 6893 DeclarationName ConstructorName 6894 = Context.DeclarationNames.getCXXConstructorName( 6895 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6896 6897 DeclContext::lookup_const_iterator Con, ConEnd; 6898 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6899 Con != ConEnd; ++Con) { 6900 // A function template cannot be defaulted. 6901 if (isa<FunctionTemplateDecl>(*Con)) 6902 continue; 6903 6904 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6905 if (Constructor->isDefaultConstructor()) 6906 return Constructor->isDefaulted() ? Constructor : 0; 6907 } 6908 return 0; 6909} 6910 6911void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6912 if (!D) return; 6913 AdjustDeclIfTemplate(D); 6914 6915 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6916 CXXConstructorDecl *CtorDecl 6917 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6918 6919 if (!CtorDecl) return; 6920 6921 // Compute the exception specification for the default constructor. 6922 const FunctionProtoType *CtorTy = 6923 CtorDecl->getType()->castAs<FunctionProtoType>(); 6924 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6925 ImplicitExceptionSpecification Spec = 6926 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6927 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6928 assert(EPI.ExceptionSpecType != EST_Delayed); 6929 6930 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6931 } 6932 6933 // If the default constructor is explicitly defaulted, checking the exception 6934 // specification is deferred until now. 6935 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6936 !ClassDecl->isDependentType()) 6937 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6938} 6939 6940void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6941 // We start with an initial pass over the base classes to collect those that 6942 // inherit constructors from. If there are none, we can forgo all further 6943 // processing. 6944 typedef SmallVector<const RecordType *, 4> BasesVector; 6945 BasesVector BasesToInheritFrom; 6946 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6947 BaseE = ClassDecl->bases_end(); 6948 BaseIt != BaseE; ++BaseIt) { 6949 if (BaseIt->getInheritConstructors()) { 6950 QualType Base = BaseIt->getType(); 6951 if (Base->isDependentType()) { 6952 // If we inherit constructors from anything that is dependent, just 6953 // abort processing altogether. We'll get another chance for the 6954 // instantiations. 6955 return; 6956 } 6957 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6958 } 6959 } 6960 if (BasesToInheritFrom.empty()) 6961 return; 6962 6963 // Now collect the constructors that we already have in the current class. 6964 // Those take precedence over inherited constructors. 6965 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6966 // unless there is a user-declared constructor with the same signature in 6967 // the class where the using-declaration appears. 6968 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6969 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6970 CtorE = ClassDecl->ctor_end(); 6971 CtorIt != CtorE; ++CtorIt) { 6972 ExistingConstructors.insert( 6973 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6974 } 6975 6976 Scope *S = getScopeForContext(ClassDecl); 6977 DeclarationName CreatedCtorName = 6978 Context.DeclarationNames.getCXXConstructorName( 6979 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6980 6981 // Now comes the true work. 6982 // First, we keep a map from constructor types to the base that introduced 6983 // them. Needed for finding conflicting constructors. We also keep the 6984 // actually inserted declarations in there, for pretty diagnostics. 6985 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6986 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6987 ConstructorToSourceMap InheritedConstructors; 6988 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6989 BaseE = BasesToInheritFrom.end(); 6990 BaseIt != BaseE; ++BaseIt) { 6991 const RecordType *Base = *BaseIt; 6992 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6993 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6994 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6995 CtorE = BaseDecl->ctor_end(); 6996 CtorIt != CtorE; ++CtorIt) { 6997 // Find the using declaration for inheriting this base's constructors. 6998 DeclarationName Name = 6999 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7000 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 7001 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 7002 SourceLocation UsingLoc = UD ? UD->getLocation() : 7003 ClassDecl->getLocation(); 7004 7005 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7006 // from the class X named in the using-declaration consists of actual 7007 // constructors and notional constructors that result from the 7008 // transformation of defaulted parameters as follows: 7009 // - all non-template default constructors of X, and 7010 // - for each non-template constructor of X that has at least one 7011 // parameter with a default argument, the set of constructors that 7012 // results from omitting any ellipsis parameter specification and 7013 // successively omitting parameters with a default argument from the 7014 // end of the parameter-type-list. 7015 CXXConstructorDecl *BaseCtor = *CtorIt; 7016 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7017 const FunctionProtoType *BaseCtorType = 7018 BaseCtor->getType()->getAs<FunctionProtoType>(); 7019 7020 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7021 maxParams = BaseCtor->getNumParams(); 7022 params <= maxParams; ++params) { 7023 // Skip default constructors. They're never inherited. 7024 if (params == 0) 7025 continue; 7026 // Skip copy and move constructors for the same reason. 7027 if (CanBeCopyOrMove && params == 1) 7028 continue; 7029 7030 // Build up a function type for this particular constructor. 7031 // FIXME: The working paper does not consider that the exception spec 7032 // for the inheriting constructor might be larger than that of the 7033 // source. This code doesn't yet, either. When it does, this code will 7034 // need to be delayed until after exception specifications and in-class 7035 // member initializers are attached. 7036 const Type *NewCtorType; 7037 if (params == maxParams) 7038 NewCtorType = BaseCtorType; 7039 else { 7040 SmallVector<QualType, 16> Args; 7041 for (unsigned i = 0; i < params; ++i) { 7042 Args.push_back(BaseCtorType->getArgType(i)); 7043 } 7044 FunctionProtoType::ExtProtoInfo ExtInfo = 7045 BaseCtorType->getExtProtoInfo(); 7046 ExtInfo.Variadic = false; 7047 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7048 Args.data(), params, ExtInfo) 7049 .getTypePtr(); 7050 } 7051 const Type *CanonicalNewCtorType = 7052 Context.getCanonicalType(NewCtorType); 7053 7054 // Now that we have the type, first check if the class already has a 7055 // constructor with this signature. 7056 if (ExistingConstructors.count(CanonicalNewCtorType)) 7057 continue; 7058 7059 // Then we check if we have already declared an inherited constructor 7060 // with this signature. 7061 std::pair<ConstructorToSourceMap::iterator, bool> result = 7062 InheritedConstructors.insert(std::make_pair( 7063 CanonicalNewCtorType, 7064 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7065 if (!result.second) { 7066 // Already in the map. If it came from a different class, that's an 7067 // error. Not if it's from the same. 7068 CanQualType PreviousBase = result.first->second.first; 7069 if (CanonicalBase != PreviousBase) { 7070 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7071 const CXXConstructorDecl *PrevBaseCtor = 7072 PrevCtor->getInheritedConstructor(); 7073 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7074 7075 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7076 Diag(BaseCtor->getLocation(), 7077 diag::note_using_decl_constructor_conflict_current_ctor); 7078 Diag(PrevBaseCtor->getLocation(), 7079 diag::note_using_decl_constructor_conflict_previous_ctor); 7080 Diag(PrevCtor->getLocation(), 7081 diag::note_using_decl_constructor_conflict_previous_using); 7082 } 7083 continue; 7084 } 7085 7086 // OK, we're there, now add the constructor. 7087 // C++0x [class.inhctor]p8: [...] that would be performed by a 7088 // user-written inline constructor [...] 7089 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7090 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7091 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7092 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7093 /*ImplicitlyDeclared=*/true, 7094 // FIXME: Due to a defect in the standard, we treat inherited 7095 // constructors as constexpr even if that makes them ill-formed. 7096 /*Constexpr=*/BaseCtor->isConstexpr()); 7097 NewCtor->setAccess(BaseCtor->getAccess()); 7098 7099 // Build up the parameter decls and add them. 7100 SmallVector<ParmVarDecl *, 16> ParamDecls; 7101 for (unsigned i = 0; i < params; ++i) { 7102 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7103 UsingLoc, UsingLoc, 7104 /*IdentifierInfo=*/0, 7105 BaseCtorType->getArgType(i), 7106 /*TInfo=*/0, SC_None, 7107 SC_None, /*DefaultArg=*/0)); 7108 } 7109 NewCtor->setParams(ParamDecls); 7110 NewCtor->setInheritedConstructor(BaseCtor); 7111 7112 PushOnScopeChains(NewCtor, S, false); 7113 ClassDecl->addDecl(NewCtor); 7114 result.first->second.second = NewCtor; 7115 } 7116 } 7117 } 7118} 7119 7120Sema::ImplicitExceptionSpecification 7121Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7122 // C++ [except.spec]p14: 7123 // An implicitly declared special member function (Clause 12) shall have 7124 // an exception-specification. 7125 ImplicitExceptionSpecification ExceptSpec(Context); 7126 if (ClassDecl->isInvalidDecl()) 7127 return ExceptSpec; 7128 7129 // Direct base-class destructors. 7130 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7131 BEnd = ClassDecl->bases_end(); 7132 B != BEnd; ++B) { 7133 if (B->isVirtual()) // Handled below. 7134 continue; 7135 7136 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7137 ExceptSpec.CalledDecl( 7138 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7139 } 7140 7141 // Virtual base-class destructors. 7142 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7143 BEnd = ClassDecl->vbases_end(); 7144 B != BEnd; ++B) { 7145 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7146 ExceptSpec.CalledDecl( 7147 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7148 } 7149 7150 // Field destructors. 7151 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7152 FEnd = ClassDecl->field_end(); 7153 F != FEnd; ++F) { 7154 if (const RecordType *RecordTy 7155 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7156 ExceptSpec.CalledDecl( 7157 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7158 } 7159 7160 return ExceptSpec; 7161} 7162 7163CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7164 // C++ [class.dtor]p2: 7165 // If a class has no user-declared destructor, a destructor is 7166 // declared implicitly. An implicitly-declared destructor is an 7167 // inline public member of its class. 7168 7169 ImplicitExceptionSpecification Spec = 7170 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7171 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7172 7173 // Create the actual destructor declaration. 7174 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7175 7176 CanQualType ClassType 7177 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7178 SourceLocation ClassLoc = ClassDecl->getLocation(); 7179 DeclarationName Name 7180 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7181 DeclarationNameInfo NameInfo(Name, ClassLoc); 7182 CXXDestructorDecl *Destructor 7183 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7184 /*isInline=*/true, 7185 /*isImplicitlyDeclared=*/true); 7186 Destructor->setAccess(AS_public); 7187 Destructor->setDefaulted(); 7188 Destructor->setImplicit(); 7189 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7190 7191 // Note that we have declared this destructor. 7192 ++ASTContext::NumImplicitDestructorsDeclared; 7193 7194 // Introduce this destructor into its scope. 7195 if (Scope *S = getScopeForContext(ClassDecl)) 7196 PushOnScopeChains(Destructor, S, false); 7197 ClassDecl->addDecl(Destructor); 7198 7199 // This could be uniqued if it ever proves significant. 7200 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7201 7202 AddOverriddenMethods(ClassDecl, Destructor); 7203 7204 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7205 Destructor->setDeletedAsWritten(); 7206 7207 return Destructor; 7208} 7209 7210void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7211 CXXDestructorDecl *Destructor) { 7212 assert((Destructor->isDefaulted() && 7213 !Destructor->doesThisDeclarationHaveABody() && 7214 !Destructor->isDeleted()) && 7215 "DefineImplicitDestructor - call it for implicit default dtor"); 7216 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7217 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7218 7219 if (Destructor->isInvalidDecl()) 7220 return; 7221 7222 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7223 7224 DiagnosticErrorTrap Trap(Diags); 7225 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7226 Destructor->getParent()); 7227 7228 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7229 Diag(CurrentLocation, diag::note_member_synthesized_at) 7230 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7231 7232 Destructor->setInvalidDecl(); 7233 return; 7234 } 7235 7236 SourceLocation Loc = Destructor->getLocation(); 7237 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7238 Destructor->setImplicitlyDefined(true); 7239 Destructor->setUsed(); 7240 MarkVTableUsed(CurrentLocation, ClassDecl); 7241 7242 if (ASTMutationListener *L = getASTMutationListener()) { 7243 L->CompletedImplicitDefinition(Destructor); 7244 } 7245} 7246 7247void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7248 CXXDestructorDecl *destructor) { 7249 // C++11 [class.dtor]p3: 7250 // A declaration of a destructor that does not have an exception- 7251 // specification is implicitly considered to have the same exception- 7252 // specification as an implicit declaration. 7253 const FunctionProtoType *dtorType = destructor->getType()-> 7254 getAs<FunctionProtoType>(); 7255 if (dtorType->hasExceptionSpec()) 7256 return; 7257 7258 ImplicitExceptionSpecification exceptSpec = 7259 ComputeDefaultedDtorExceptionSpec(classDecl); 7260 7261 // Replace the destructor's type, building off the existing one. Fortunately, 7262 // the only thing of interest in the destructor type is its extended info. 7263 // The return and arguments are fixed. 7264 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7265 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7266 epi.NumExceptions = exceptSpec.size(); 7267 epi.Exceptions = exceptSpec.data(); 7268 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7269 7270 destructor->setType(ty); 7271 7272 // FIXME: If the destructor has a body that could throw, and the newly created 7273 // spec doesn't allow exceptions, we should emit a warning, because this 7274 // change in behavior can break conforming C++03 programs at runtime. 7275 // However, we don't have a body yet, so it needs to be done somewhere else. 7276} 7277 7278/// \brief Builds a statement that copies/moves the given entity from \p From to 7279/// \c To. 7280/// 7281/// This routine is used to copy/move the members of a class with an 7282/// implicitly-declared copy/move assignment operator. When the entities being 7283/// copied are arrays, this routine builds for loops to copy them. 7284/// 7285/// \param S The Sema object used for type-checking. 7286/// 7287/// \param Loc The location where the implicit copy/move is being generated. 7288/// 7289/// \param T The type of the expressions being copied/moved. Both expressions 7290/// must have this type. 7291/// 7292/// \param To The expression we are copying/moving to. 7293/// 7294/// \param From The expression we are copying/moving from. 7295/// 7296/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7297/// Otherwise, it's a non-static member subobject. 7298/// 7299/// \param Copying Whether we're copying or moving. 7300/// 7301/// \param Depth Internal parameter recording the depth of the recursion. 7302/// 7303/// \returns A statement or a loop that copies the expressions. 7304static StmtResult 7305BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7306 Expr *To, Expr *From, 7307 bool CopyingBaseSubobject, bool Copying, 7308 unsigned Depth = 0) { 7309 // C++0x [class.copy]p28: 7310 // Each subobject is assigned in the manner appropriate to its type: 7311 // 7312 // - if the subobject is of class type, as if by a call to operator= with 7313 // the subobject as the object expression and the corresponding 7314 // subobject of x as a single function argument (as if by explicit 7315 // qualification; that is, ignoring any possible virtual overriding 7316 // functions in more derived classes); 7317 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7318 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7319 7320 // Look for operator=. 7321 DeclarationName Name 7322 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7323 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7324 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7325 7326 // Filter out any result that isn't a copy/move-assignment operator. 7327 LookupResult::Filter F = OpLookup.makeFilter(); 7328 while (F.hasNext()) { 7329 NamedDecl *D = F.next(); 7330 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7331 if (Copying ? Method->isCopyAssignmentOperator() : 7332 Method->isMoveAssignmentOperator()) 7333 continue; 7334 7335 F.erase(); 7336 } 7337 F.done(); 7338 7339 // Suppress the protected check (C++ [class.protected]) for each of the 7340 // assignment operators we found. This strange dance is required when 7341 // we're assigning via a base classes's copy-assignment operator. To 7342 // ensure that we're getting the right base class subobject (without 7343 // ambiguities), we need to cast "this" to that subobject type; to 7344 // ensure that we don't go through the virtual call mechanism, we need 7345 // to qualify the operator= name with the base class (see below). However, 7346 // this means that if the base class has a protected copy assignment 7347 // operator, the protected member access check will fail. So, we 7348 // rewrite "protected" access to "public" access in this case, since we 7349 // know by construction that we're calling from a derived class. 7350 if (CopyingBaseSubobject) { 7351 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7352 L != LEnd; ++L) { 7353 if (L.getAccess() == AS_protected) 7354 L.setAccess(AS_public); 7355 } 7356 } 7357 7358 // Create the nested-name-specifier that will be used to qualify the 7359 // reference to operator=; this is required to suppress the virtual 7360 // call mechanism. 7361 CXXScopeSpec SS; 7362 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7363 SS.MakeTrivial(S.Context, 7364 NestedNameSpecifier::Create(S.Context, 0, false, 7365 CanonicalT), 7366 Loc); 7367 7368 // Create the reference to operator=. 7369 ExprResult OpEqualRef 7370 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7371 /*TemplateKWLoc=*/SourceLocation(), 7372 /*FirstQualifierInScope=*/0, 7373 OpLookup, 7374 /*TemplateArgs=*/0, 7375 /*SuppressQualifierCheck=*/true); 7376 if (OpEqualRef.isInvalid()) 7377 return StmtError(); 7378 7379 // Build the call to the assignment operator. 7380 7381 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7382 OpEqualRef.takeAs<Expr>(), 7383 Loc, &From, 1, Loc); 7384 if (Call.isInvalid()) 7385 return StmtError(); 7386 7387 return S.Owned(Call.takeAs<Stmt>()); 7388 } 7389 7390 // - if the subobject is of scalar type, the built-in assignment 7391 // operator is used. 7392 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7393 if (!ArrayTy) { 7394 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7395 if (Assignment.isInvalid()) 7396 return StmtError(); 7397 7398 return S.Owned(Assignment.takeAs<Stmt>()); 7399 } 7400 7401 // - if the subobject is an array, each element is assigned, in the 7402 // manner appropriate to the element type; 7403 7404 // Construct a loop over the array bounds, e.g., 7405 // 7406 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7407 // 7408 // that will copy each of the array elements. 7409 QualType SizeType = S.Context.getSizeType(); 7410 7411 // Create the iteration variable. 7412 IdentifierInfo *IterationVarName = 0; 7413 { 7414 SmallString<8> Str; 7415 llvm::raw_svector_ostream OS(Str); 7416 OS << "__i" << Depth; 7417 IterationVarName = &S.Context.Idents.get(OS.str()); 7418 } 7419 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7420 IterationVarName, SizeType, 7421 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7422 SC_None, SC_None); 7423 7424 // Initialize the iteration variable to zero. 7425 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7426 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7427 7428 // Create a reference to the iteration variable; we'll use this several 7429 // times throughout. 7430 Expr *IterationVarRef 7431 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7432 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7433 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7434 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7435 7436 // Create the DeclStmt that holds the iteration variable. 7437 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7438 7439 // Create the comparison against the array bound. 7440 llvm::APInt Upper 7441 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7442 Expr *Comparison 7443 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7444 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7445 BO_NE, S.Context.BoolTy, 7446 VK_RValue, OK_Ordinary, Loc); 7447 7448 // Create the pre-increment of the iteration variable. 7449 Expr *Increment 7450 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7451 VK_LValue, OK_Ordinary, Loc); 7452 7453 // Subscript the "from" and "to" expressions with the iteration variable. 7454 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7455 IterationVarRefRVal, 7456 Loc)); 7457 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7458 IterationVarRefRVal, 7459 Loc)); 7460 if (!Copying) // Cast to rvalue 7461 From = CastForMoving(S, From); 7462 7463 // Build the copy/move for an individual element of the array. 7464 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7465 To, From, CopyingBaseSubobject, 7466 Copying, Depth + 1); 7467 if (Copy.isInvalid()) 7468 return StmtError(); 7469 7470 // Construct the loop that copies all elements of this array. 7471 return S.ActOnForStmt(Loc, Loc, InitStmt, 7472 S.MakeFullExpr(Comparison), 7473 0, S.MakeFullExpr(Increment), 7474 Loc, Copy.take()); 7475} 7476 7477std::pair<Sema::ImplicitExceptionSpecification, bool> 7478Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7479 CXXRecordDecl *ClassDecl) { 7480 if (ClassDecl->isInvalidDecl()) 7481 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7482 7483 // C++ [class.copy]p10: 7484 // If the class definition does not explicitly declare a copy 7485 // assignment operator, one is declared implicitly. 7486 // The implicitly-defined copy assignment operator for a class X 7487 // will have the form 7488 // 7489 // X& X::operator=(const X&) 7490 // 7491 // if 7492 bool HasConstCopyAssignment = true; 7493 7494 // -- each direct base class B of X has a copy assignment operator 7495 // whose parameter is of type const B&, const volatile B& or B, 7496 // and 7497 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7498 BaseEnd = ClassDecl->bases_end(); 7499 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7500 // We'll handle this below 7501 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7502 continue; 7503 7504 assert(!Base->getType()->isDependentType() && 7505 "Cannot generate implicit members for class with dependent bases."); 7506 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7507 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7508 &HasConstCopyAssignment); 7509 } 7510 7511 // In C++11, the above citation has "or virtual" added 7512 if (LangOpts.CPlusPlus0x) { 7513 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7514 BaseEnd = ClassDecl->vbases_end(); 7515 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7516 assert(!Base->getType()->isDependentType() && 7517 "Cannot generate implicit members for class with dependent bases."); 7518 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7519 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7520 &HasConstCopyAssignment); 7521 } 7522 } 7523 7524 // -- for all the nonstatic data members of X that are of a class 7525 // type M (or array thereof), each such class type has a copy 7526 // assignment operator whose parameter is of type const M&, 7527 // const volatile M& or M. 7528 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7529 FieldEnd = ClassDecl->field_end(); 7530 HasConstCopyAssignment && Field != FieldEnd; 7531 ++Field) { 7532 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7533 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7534 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7535 &HasConstCopyAssignment); 7536 } 7537 } 7538 7539 // Otherwise, the implicitly declared copy assignment operator will 7540 // have the form 7541 // 7542 // X& X::operator=(X&) 7543 7544 // C++ [except.spec]p14: 7545 // An implicitly declared special member function (Clause 12) shall have an 7546 // exception-specification. [...] 7547 7548 // It is unspecified whether or not an implicit copy assignment operator 7549 // attempts to deduplicate calls to assignment operators of virtual bases are 7550 // made. As such, this exception specification is effectively unspecified. 7551 // Based on a similar decision made for constness in C++0x, we're erring on 7552 // the side of assuming such calls to be made regardless of whether they 7553 // actually happen. 7554 ImplicitExceptionSpecification ExceptSpec(Context); 7555 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7556 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7557 BaseEnd = ClassDecl->bases_end(); 7558 Base != BaseEnd; ++Base) { 7559 if (Base->isVirtual()) 7560 continue; 7561 7562 CXXRecordDecl *BaseClassDecl 7563 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7564 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7565 ArgQuals, false, 0)) 7566 ExceptSpec.CalledDecl(CopyAssign); 7567 } 7568 7569 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7570 BaseEnd = ClassDecl->vbases_end(); 7571 Base != BaseEnd; ++Base) { 7572 CXXRecordDecl *BaseClassDecl 7573 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7574 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7575 ArgQuals, false, 0)) 7576 ExceptSpec.CalledDecl(CopyAssign); 7577 } 7578 7579 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7580 FieldEnd = ClassDecl->field_end(); 7581 Field != FieldEnd; 7582 ++Field) { 7583 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7584 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7585 if (CXXMethodDecl *CopyAssign = 7586 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7587 ExceptSpec.CalledDecl(CopyAssign); 7588 } 7589 } 7590 7591 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7592} 7593 7594CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7595 // Note: The following rules are largely analoguous to the copy 7596 // constructor rules. Note that virtual bases are not taken into account 7597 // for determining the argument type of the operator. Note also that 7598 // operators taking an object instead of a reference are allowed. 7599 7600 ImplicitExceptionSpecification Spec(Context); 7601 bool Const; 7602 llvm::tie(Spec, Const) = 7603 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7604 7605 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7606 QualType RetType = Context.getLValueReferenceType(ArgType); 7607 if (Const) 7608 ArgType = ArgType.withConst(); 7609 ArgType = Context.getLValueReferenceType(ArgType); 7610 7611 // An implicitly-declared copy assignment operator is an inline public 7612 // member of its class. 7613 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7614 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7615 SourceLocation ClassLoc = ClassDecl->getLocation(); 7616 DeclarationNameInfo NameInfo(Name, ClassLoc); 7617 CXXMethodDecl *CopyAssignment 7618 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7619 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7620 /*TInfo=*/0, /*isStatic=*/false, 7621 /*StorageClassAsWritten=*/SC_None, 7622 /*isInline=*/true, /*isConstexpr=*/false, 7623 SourceLocation()); 7624 CopyAssignment->setAccess(AS_public); 7625 CopyAssignment->setDefaulted(); 7626 CopyAssignment->setImplicit(); 7627 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7628 7629 // Add the parameter to the operator. 7630 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7631 ClassLoc, ClassLoc, /*Id=*/0, 7632 ArgType, /*TInfo=*/0, 7633 SC_None, 7634 SC_None, 0); 7635 CopyAssignment->setParams(FromParam); 7636 7637 // Note that we have added this copy-assignment operator. 7638 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7639 7640 if (Scope *S = getScopeForContext(ClassDecl)) 7641 PushOnScopeChains(CopyAssignment, S, false); 7642 ClassDecl->addDecl(CopyAssignment); 7643 7644 // C++0x [class.copy]p19: 7645 // .... If the class definition does not explicitly declare a copy 7646 // assignment operator, there is no user-declared move constructor, and 7647 // there is no user-declared move assignment operator, a copy assignment 7648 // operator is implicitly declared as defaulted. 7649 if ((ClassDecl->hasUserDeclaredMoveConstructor() && 7650 !getLangOptions().MicrosoftMode) || 7651 ClassDecl->hasUserDeclaredMoveAssignment() || 7652 ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7653 CopyAssignment->setDeletedAsWritten(); 7654 7655 AddOverriddenMethods(ClassDecl, CopyAssignment); 7656 return CopyAssignment; 7657} 7658 7659void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7660 CXXMethodDecl *CopyAssignOperator) { 7661 assert((CopyAssignOperator->isDefaulted() && 7662 CopyAssignOperator->isOverloadedOperator() && 7663 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7664 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7665 !CopyAssignOperator->isDeleted()) && 7666 "DefineImplicitCopyAssignment called for wrong function"); 7667 7668 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7669 7670 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7671 CopyAssignOperator->setInvalidDecl(); 7672 return; 7673 } 7674 7675 CopyAssignOperator->setUsed(); 7676 7677 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7678 DiagnosticErrorTrap Trap(Diags); 7679 7680 // C++0x [class.copy]p30: 7681 // The implicitly-defined or explicitly-defaulted copy assignment operator 7682 // for a non-union class X performs memberwise copy assignment of its 7683 // subobjects. The direct base classes of X are assigned first, in the 7684 // order of their declaration in the base-specifier-list, and then the 7685 // immediate non-static data members of X are assigned, in the order in 7686 // which they were declared in the class definition. 7687 7688 // The statements that form the synthesized function body. 7689 ASTOwningVector<Stmt*> Statements(*this); 7690 7691 // The parameter for the "other" object, which we are copying from. 7692 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7693 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7694 QualType OtherRefType = Other->getType(); 7695 if (const LValueReferenceType *OtherRef 7696 = OtherRefType->getAs<LValueReferenceType>()) { 7697 OtherRefType = OtherRef->getPointeeType(); 7698 OtherQuals = OtherRefType.getQualifiers(); 7699 } 7700 7701 // Our location for everything implicitly-generated. 7702 SourceLocation Loc = CopyAssignOperator->getLocation(); 7703 7704 // Construct a reference to the "other" object. We'll be using this 7705 // throughout the generated ASTs. 7706 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7707 assert(OtherRef && "Reference to parameter cannot fail!"); 7708 7709 // Construct the "this" pointer. We'll be using this throughout the generated 7710 // ASTs. 7711 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7712 assert(This && "Reference to this cannot fail!"); 7713 7714 // Assign base classes. 7715 bool Invalid = false; 7716 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7717 E = ClassDecl->bases_end(); Base != E; ++Base) { 7718 // Form the assignment: 7719 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7720 QualType BaseType = Base->getType().getUnqualifiedType(); 7721 if (!BaseType->isRecordType()) { 7722 Invalid = true; 7723 continue; 7724 } 7725 7726 CXXCastPath BasePath; 7727 BasePath.push_back(Base); 7728 7729 // Construct the "from" expression, which is an implicit cast to the 7730 // appropriately-qualified base type. 7731 Expr *From = OtherRef; 7732 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7733 CK_UncheckedDerivedToBase, 7734 VK_LValue, &BasePath).take(); 7735 7736 // Dereference "this". 7737 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7738 7739 // Implicitly cast "this" to the appropriately-qualified base type. 7740 To = ImpCastExprToType(To.take(), 7741 Context.getCVRQualifiedType(BaseType, 7742 CopyAssignOperator->getTypeQualifiers()), 7743 CK_UncheckedDerivedToBase, 7744 VK_LValue, &BasePath); 7745 7746 // Build the copy. 7747 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7748 To.get(), From, 7749 /*CopyingBaseSubobject=*/true, 7750 /*Copying=*/true); 7751 if (Copy.isInvalid()) { 7752 Diag(CurrentLocation, diag::note_member_synthesized_at) 7753 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7754 CopyAssignOperator->setInvalidDecl(); 7755 return; 7756 } 7757 7758 // Success! Record the copy. 7759 Statements.push_back(Copy.takeAs<Expr>()); 7760 } 7761 7762 // \brief Reference to the __builtin_memcpy function. 7763 Expr *BuiltinMemCpyRef = 0; 7764 // \brief Reference to the __builtin_objc_memmove_collectable function. 7765 Expr *CollectableMemCpyRef = 0; 7766 7767 // Assign non-static members. 7768 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7769 FieldEnd = ClassDecl->field_end(); 7770 Field != FieldEnd; ++Field) { 7771 if (Field->isUnnamedBitfield()) 7772 continue; 7773 7774 // Check for members of reference type; we can't copy those. 7775 if (Field->getType()->isReferenceType()) { 7776 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7777 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7778 Diag(Field->getLocation(), diag::note_declared_at); 7779 Diag(CurrentLocation, diag::note_member_synthesized_at) 7780 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7781 Invalid = true; 7782 continue; 7783 } 7784 7785 // Check for members of const-qualified, non-class type. 7786 QualType BaseType = Context.getBaseElementType(Field->getType()); 7787 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7788 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7789 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7790 Diag(Field->getLocation(), diag::note_declared_at); 7791 Diag(CurrentLocation, diag::note_member_synthesized_at) 7792 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7793 Invalid = true; 7794 continue; 7795 } 7796 7797 // Suppress assigning zero-width bitfields. 7798 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7799 continue; 7800 7801 QualType FieldType = Field->getType().getNonReferenceType(); 7802 if (FieldType->isIncompleteArrayType()) { 7803 assert(ClassDecl->hasFlexibleArrayMember() && 7804 "Incomplete array type is not valid"); 7805 continue; 7806 } 7807 7808 // Build references to the field in the object we're copying from and to. 7809 CXXScopeSpec SS; // Intentionally empty 7810 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7811 LookupMemberName); 7812 MemberLookup.addDecl(*Field); 7813 MemberLookup.resolveKind(); 7814 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7815 Loc, /*IsArrow=*/false, 7816 SS, SourceLocation(), 0, 7817 MemberLookup, 0); 7818 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7819 Loc, /*IsArrow=*/true, 7820 SS, SourceLocation(), 0, 7821 MemberLookup, 0); 7822 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7823 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7824 7825 // If the field should be copied with __builtin_memcpy rather than via 7826 // explicit assignments, do so. This optimization only applies for arrays 7827 // of scalars and arrays of class type with trivial copy-assignment 7828 // operators. 7829 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7830 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7831 // Compute the size of the memory buffer to be copied. 7832 QualType SizeType = Context.getSizeType(); 7833 llvm::APInt Size(Context.getTypeSize(SizeType), 7834 Context.getTypeSizeInChars(BaseType).getQuantity()); 7835 for (const ConstantArrayType *Array 7836 = Context.getAsConstantArrayType(FieldType); 7837 Array; 7838 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7839 llvm::APInt ArraySize 7840 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7841 Size *= ArraySize; 7842 } 7843 7844 // Take the address of the field references for "from" and "to". 7845 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7846 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7847 7848 bool NeedsCollectableMemCpy = 7849 (BaseType->isRecordType() && 7850 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7851 7852 if (NeedsCollectableMemCpy) { 7853 if (!CollectableMemCpyRef) { 7854 // Create a reference to the __builtin_objc_memmove_collectable function. 7855 LookupResult R(*this, 7856 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7857 Loc, LookupOrdinaryName); 7858 LookupName(R, TUScope, true); 7859 7860 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7861 if (!CollectableMemCpy) { 7862 // Something went horribly wrong earlier, and we will have 7863 // complained about it. 7864 Invalid = true; 7865 continue; 7866 } 7867 7868 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7869 CollectableMemCpy->getType(), 7870 VK_LValue, Loc, 0).take(); 7871 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7872 } 7873 } 7874 // Create a reference to the __builtin_memcpy builtin function. 7875 else if (!BuiltinMemCpyRef) { 7876 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7877 LookupOrdinaryName); 7878 LookupName(R, TUScope, true); 7879 7880 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7881 if (!BuiltinMemCpy) { 7882 // Something went horribly wrong earlier, and we will have complained 7883 // about it. 7884 Invalid = true; 7885 continue; 7886 } 7887 7888 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7889 BuiltinMemCpy->getType(), 7890 VK_LValue, Loc, 0).take(); 7891 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7892 } 7893 7894 ASTOwningVector<Expr*> CallArgs(*this); 7895 CallArgs.push_back(To.takeAs<Expr>()); 7896 CallArgs.push_back(From.takeAs<Expr>()); 7897 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7898 ExprResult Call = ExprError(); 7899 if (NeedsCollectableMemCpy) 7900 Call = ActOnCallExpr(/*Scope=*/0, 7901 CollectableMemCpyRef, 7902 Loc, move_arg(CallArgs), 7903 Loc); 7904 else 7905 Call = ActOnCallExpr(/*Scope=*/0, 7906 BuiltinMemCpyRef, 7907 Loc, move_arg(CallArgs), 7908 Loc); 7909 7910 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7911 Statements.push_back(Call.takeAs<Expr>()); 7912 continue; 7913 } 7914 7915 // Build the copy of this field. 7916 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7917 To.get(), From.get(), 7918 /*CopyingBaseSubobject=*/false, 7919 /*Copying=*/true); 7920 if (Copy.isInvalid()) { 7921 Diag(CurrentLocation, diag::note_member_synthesized_at) 7922 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7923 CopyAssignOperator->setInvalidDecl(); 7924 return; 7925 } 7926 7927 // Success! Record the copy. 7928 Statements.push_back(Copy.takeAs<Stmt>()); 7929 } 7930 7931 if (!Invalid) { 7932 // Add a "return *this;" 7933 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7934 7935 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7936 if (Return.isInvalid()) 7937 Invalid = true; 7938 else { 7939 Statements.push_back(Return.takeAs<Stmt>()); 7940 7941 if (Trap.hasErrorOccurred()) { 7942 Diag(CurrentLocation, diag::note_member_synthesized_at) 7943 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7944 Invalid = true; 7945 } 7946 } 7947 } 7948 7949 if (Invalid) { 7950 CopyAssignOperator->setInvalidDecl(); 7951 return; 7952 } 7953 7954 StmtResult Body; 7955 { 7956 CompoundScopeRAII CompoundScope(*this); 7957 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7958 /*isStmtExpr=*/false); 7959 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7960 } 7961 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7962 7963 if (ASTMutationListener *L = getASTMutationListener()) { 7964 L->CompletedImplicitDefinition(CopyAssignOperator); 7965 } 7966} 7967 7968Sema::ImplicitExceptionSpecification 7969Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7970 ImplicitExceptionSpecification ExceptSpec(Context); 7971 7972 if (ClassDecl->isInvalidDecl()) 7973 return ExceptSpec; 7974 7975 // C++0x [except.spec]p14: 7976 // An implicitly declared special member function (Clause 12) shall have an 7977 // exception-specification. [...] 7978 7979 // It is unspecified whether or not an implicit move assignment operator 7980 // attempts to deduplicate calls to assignment operators of virtual bases are 7981 // made. As such, this exception specification is effectively unspecified. 7982 // Based on a similar decision made for constness in C++0x, we're erring on 7983 // the side of assuming such calls to be made regardless of whether they 7984 // actually happen. 7985 // Note that a move constructor is not implicitly declared when there are 7986 // virtual bases, but it can still be user-declared and explicitly defaulted. 7987 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7988 BaseEnd = ClassDecl->bases_end(); 7989 Base != BaseEnd; ++Base) { 7990 if (Base->isVirtual()) 7991 continue; 7992 7993 CXXRecordDecl *BaseClassDecl 7994 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7995 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7996 false, 0)) 7997 ExceptSpec.CalledDecl(MoveAssign); 7998 } 7999 8000 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8001 BaseEnd = ClassDecl->vbases_end(); 8002 Base != BaseEnd; ++Base) { 8003 CXXRecordDecl *BaseClassDecl 8004 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8005 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8006 false, 0)) 8007 ExceptSpec.CalledDecl(MoveAssign); 8008 } 8009 8010 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8011 FieldEnd = ClassDecl->field_end(); 8012 Field != FieldEnd; 8013 ++Field) { 8014 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8015 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8016 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8017 false, 0)) 8018 ExceptSpec.CalledDecl(MoveAssign); 8019 } 8020 } 8021 8022 return ExceptSpec; 8023} 8024 8025CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8026 // Note: The following rules are largely analoguous to the move 8027 // constructor rules. 8028 8029 ImplicitExceptionSpecification Spec( 8030 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8031 8032 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8033 QualType RetType = Context.getLValueReferenceType(ArgType); 8034 ArgType = Context.getRValueReferenceType(ArgType); 8035 8036 // An implicitly-declared move assignment operator is an inline public 8037 // member of its class. 8038 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8039 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8040 SourceLocation ClassLoc = ClassDecl->getLocation(); 8041 DeclarationNameInfo NameInfo(Name, ClassLoc); 8042 CXXMethodDecl *MoveAssignment 8043 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8044 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8045 /*TInfo=*/0, /*isStatic=*/false, 8046 /*StorageClassAsWritten=*/SC_None, 8047 /*isInline=*/true, 8048 /*isConstexpr=*/false, 8049 SourceLocation()); 8050 MoveAssignment->setAccess(AS_public); 8051 MoveAssignment->setDefaulted(); 8052 MoveAssignment->setImplicit(); 8053 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8054 8055 // Add the parameter to the operator. 8056 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8057 ClassLoc, ClassLoc, /*Id=*/0, 8058 ArgType, /*TInfo=*/0, 8059 SC_None, 8060 SC_None, 0); 8061 MoveAssignment->setParams(FromParam); 8062 8063 // Note that we have added this copy-assignment operator. 8064 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8065 8066 // C++0x [class.copy]p9: 8067 // If the definition of a class X does not explicitly declare a move 8068 // assignment operator, one will be implicitly declared as defaulted if and 8069 // only if: 8070 // [...] 8071 // - the move assignment operator would not be implicitly defined as 8072 // deleted. 8073 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8074 // Cache this result so that we don't try to generate this over and over 8075 // on every lookup, leaking memory and wasting time. 8076 ClassDecl->setFailedImplicitMoveAssignment(); 8077 return 0; 8078 } 8079 8080 if (Scope *S = getScopeForContext(ClassDecl)) 8081 PushOnScopeChains(MoveAssignment, S, false); 8082 ClassDecl->addDecl(MoveAssignment); 8083 8084 AddOverriddenMethods(ClassDecl, MoveAssignment); 8085 return MoveAssignment; 8086} 8087 8088void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8089 CXXMethodDecl *MoveAssignOperator) { 8090 assert((MoveAssignOperator->isDefaulted() && 8091 MoveAssignOperator->isOverloadedOperator() && 8092 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8093 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8094 !MoveAssignOperator->isDeleted()) && 8095 "DefineImplicitMoveAssignment called for wrong function"); 8096 8097 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8098 8099 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8100 MoveAssignOperator->setInvalidDecl(); 8101 return; 8102 } 8103 8104 MoveAssignOperator->setUsed(); 8105 8106 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8107 DiagnosticErrorTrap Trap(Diags); 8108 8109 // C++0x [class.copy]p28: 8110 // The implicitly-defined or move assignment operator for a non-union class 8111 // X performs memberwise move assignment of its subobjects. The direct base 8112 // classes of X are assigned first, in the order of their declaration in the 8113 // base-specifier-list, and then the immediate non-static data members of X 8114 // are assigned, in the order in which they were declared in the class 8115 // definition. 8116 8117 // The statements that form the synthesized function body. 8118 ASTOwningVector<Stmt*> Statements(*this); 8119 8120 // The parameter for the "other" object, which we are move from. 8121 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8122 QualType OtherRefType = Other->getType()-> 8123 getAs<RValueReferenceType>()->getPointeeType(); 8124 assert(OtherRefType.getQualifiers() == 0 && 8125 "Bad argument type of defaulted move assignment"); 8126 8127 // Our location for everything implicitly-generated. 8128 SourceLocation Loc = MoveAssignOperator->getLocation(); 8129 8130 // Construct a reference to the "other" object. We'll be using this 8131 // throughout the generated ASTs. 8132 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8133 assert(OtherRef && "Reference to parameter cannot fail!"); 8134 // Cast to rvalue. 8135 OtherRef = CastForMoving(*this, OtherRef); 8136 8137 // Construct the "this" pointer. We'll be using this throughout the generated 8138 // ASTs. 8139 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8140 assert(This && "Reference to this cannot fail!"); 8141 8142 // Assign base classes. 8143 bool Invalid = false; 8144 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8145 E = ClassDecl->bases_end(); Base != E; ++Base) { 8146 // Form the assignment: 8147 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8148 QualType BaseType = Base->getType().getUnqualifiedType(); 8149 if (!BaseType->isRecordType()) { 8150 Invalid = true; 8151 continue; 8152 } 8153 8154 CXXCastPath BasePath; 8155 BasePath.push_back(Base); 8156 8157 // Construct the "from" expression, which is an implicit cast to the 8158 // appropriately-qualified base type. 8159 Expr *From = OtherRef; 8160 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8161 VK_XValue, &BasePath).take(); 8162 8163 // Dereference "this". 8164 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8165 8166 // Implicitly cast "this" to the appropriately-qualified base type. 8167 To = ImpCastExprToType(To.take(), 8168 Context.getCVRQualifiedType(BaseType, 8169 MoveAssignOperator->getTypeQualifiers()), 8170 CK_UncheckedDerivedToBase, 8171 VK_LValue, &BasePath); 8172 8173 // Build the move. 8174 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8175 To.get(), From, 8176 /*CopyingBaseSubobject=*/true, 8177 /*Copying=*/false); 8178 if (Move.isInvalid()) { 8179 Diag(CurrentLocation, diag::note_member_synthesized_at) 8180 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8181 MoveAssignOperator->setInvalidDecl(); 8182 return; 8183 } 8184 8185 // Success! Record the move. 8186 Statements.push_back(Move.takeAs<Expr>()); 8187 } 8188 8189 // \brief Reference to the __builtin_memcpy function. 8190 Expr *BuiltinMemCpyRef = 0; 8191 // \brief Reference to the __builtin_objc_memmove_collectable function. 8192 Expr *CollectableMemCpyRef = 0; 8193 8194 // Assign non-static members. 8195 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8196 FieldEnd = ClassDecl->field_end(); 8197 Field != FieldEnd; ++Field) { 8198 if (Field->isUnnamedBitfield()) 8199 continue; 8200 8201 // Check for members of reference type; we can't move those. 8202 if (Field->getType()->isReferenceType()) { 8203 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8204 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8205 Diag(Field->getLocation(), diag::note_declared_at); 8206 Diag(CurrentLocation, diag::note_member_synthesized_at) 8207 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8208 Invalid = true; 8209 continue; 8210 } 8211 8212 // Check for members of const-qualified, non-class type. 8213 QualType BaseType = Context.getBaseElementType(Field->getType()); 8214 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8215 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8216 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8217 Diag(Field->getLocation(), diag::note_declared_at); 8218 Diag(CurrentLocation, diag::note_member_synthesized_at) 8219 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8220 Invalid = true; 8221 continue; 8222 } 8223 8224 // Suppress assigning zero-width bitfields. 8225 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8226 continue; 8227 8228 QualType FieldType = Field->getType().getNonReferenceType(); 8229 if (FieldType->isIncompleteArrayType()) { 8230 assert(ClassDecl->hasFlexibleArrayMember() && 8231 "Incomplete array type is not valid"); 8232 continue; 8233 } 8234 8235 // Build references to the field in the object we're copying from and to. 8236 CXXScopeSpec SS; // Intentionally empty 8237 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8238 LookupMemberName); 8239 MemberLookup.addDecl(*Field); 8240 MemberLookup.resolveKind(); 8241 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8242 Loc, /*IsArrow=*/false, 8243 SS, SourceLocation(), 0, 8244 MemberLookup, 0); 8245 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8246 Loc, /*IsArrow=*/true, 8247 SS, SourceLocation(), 0, 8248 MemberLookup, 0); 8249 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8250 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8251 8252 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8253 "Member reference with rvalue base must be rvalue except for reference " 8254 "members, which aren't allowed for move assignment."); 8255 8256 // If the field should be copied with __builtin_memcpy rather than via 8257 // explicit assignments, do so. This optimization only applies for arrays 8258 // of scalars and arrays of class type with trivial move-assignment 8259 // operators. 8260 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8261 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8262 // Compute the size of the memory buffer to be copied. 8263 QualType SizeType = Context.getSizeType(); 8264 llvm::APInt Size(Context.getTypeSize(SizeType), 8265 Context.getTypeSizeInChars(BaseType).getQuantity()); 8266 for (const ConstantArrayType *Array 8267 = Context.getAsConstantArrayType(FieldType); 8268 Array; 8269 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8270 llvm::APInt ArraySize 8271 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8272 Size *= ArraySize; 8273 } 8274 8275 // Take the address of the field references for "from" and "to". We 8276 // directly construct UnaryOperators here because semantic analysis 8277 // does not permit us to take the address of an xvalue. 8278 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8279 Context.getPointerType(From.get()->getType()), 8280 VK_RValue, OK_Ordinary, Loc); 8281 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8282 Context.getPointerType(To.get()->getType()), 8283 VK_RValue, OK_Ordinary, Loc); 8284 8285 bool NeedsCollectableMemCpy = 8286 (BaseType->isRecordType() && 8287 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8288 8289 if (NeedsCollectableMemCpy) { 8290 if (!CollectableMemCpyRef) { 8291 // Create a reference to the __builtin_objc_memmove_collectable function. 8292 LookupResult R(*this, 8293 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8294 Loc, LookupOrdinaryName); 8295 LookupName(R, TUScope, true); 8296 8297 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8298 if (!CollectableMemCpy) { 8299 // Something went horribly wrong earlier, and we will have 8300 // complained about it. 8301 Invalid = true; 8302 continue; 8303 } 8304 8305 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8306 CollectableMemCpy->getType(), 8307 VK_LValue, Loc, 0).take(); 8308 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8309 } 8310 } 8311 // Create a reference to the __builtin_memcpy builtin function. 8312 else if (!BuiltinMemCpyRef) { 8313 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8314 LookupOrdinaryName); 8315 LookupName(R, TUScope, true); 8316 8317 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8318 if (!BuiltinMemCpy) { 8319 // Something went horribly wrong earlier, and we will have complained 8320 // about it. 8321 Invalid = true; 8322 continue; 8323 } 8324 8325 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8326 BuiltinMemCpy->getType(), 8327 VK_LValue, Loc, 0).take(); 8328 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8329 } 8330 8331 ASTOwningVector<Expr*> CallArgs(*this); 8332 CallArgs.push_back(To.takeAs<Expr>()); 8333 CallArgs.push_back(From.takeAs<Expr>()); 8334 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8335 ExprResult Call = ExprError(); 8336 if (NeedsCollectableMemCpy) 8337 Call = ActOnCallExpr(/*Scope=*/0, 8338 CollectableMemCpyRef, 8339 Loc, move_arg(CallArgs), 8340 Loc); 8341 else 8342 Call = ActOnCallExpr(/*Scope=*/0, 8343 BuiltinMemCpyRef, 8344 Loc, move_arg(CallArgs), 8345 Loc); 8346 8347 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8348 Statements.push_back(Call.takeAs<Expr>()); 8349 continue; 8350 } 8351 8352 // Build the move of this field. 8353 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8354 To.get(), From.get(), 8355 /*CopyingBaseSubobject=*/false, 8356 /*Copying=*/false); 8357 if (Move.isInvalid()) { 8358 Diag(CurrentLocation, diag::note_member_synthesized_at) 8359 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8360 MoveAssignOperator->setInvalidDecl(); 8361 return; 8362 } 8363 8364 // Success! Record the copy. 8365 Statements.push_back(Move.takeAs<Stmt>()); 8366 } 8367 8368 if (!Invalid) { 8369 // Add a "return *this;" 8370 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8371 8372 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8373 if (Return.isInvalid()) 8374 Invalid = true; 8375 else { 8376 Statements.push_back(Return.takeAs<Stmt>()); 8377 8378 if (Trap.hasErrorOccurred()) { 8379 Diag(CurrentLocation, diag::note_member_synthesized_at) 8380 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8381 Invalid = true; 8382 } 8383 } 8384 } 8385 8386 if (Invalid) { 8387 MoveAssignOperator->setInvalidDecl(); 8388 return; 8389 } 8390 8391 StmtResult Body; 8392 { 8393 CompoundScopeRAII CompoundScope(*this); 8394 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8395 /*isStmtExpr=*/false); 8396 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8397 } 8398 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8399 8400 if (ASTMutationListener *L = getASTMutationListener()) { 8401 L->CompletedImplicitDefinition(MoveAssignOperator); 8402 } 8403} 8404 8405std::pair<Sema::ImplicitExceptionSpecification, bool> 8406Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8407 if (ClassDecl->isInvalidDecl()) 8408 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8409 8410 // C++ [class.copy]p5: 8411 // The implicitly-declared copy constructor for a class X will 8412 // have the form 8413 // 8414 // X::X(const X&) 8415 // 8416 // if 8417 // FIXME: It ought to be possible to store this on the record. 8418 bool HasConstCopyConstructor = true; 8419 8420 // -- each direct or virtual base class B of X has a copy 8421 // constructor whose first parameter is of type const B& or 8422 // const volatile B&, and 8423 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8424 BaseEnd = ClassDecl->bases_end(); 8425 HasConstCopyConstructor && Base != BaseEnd; 8426 ++Base) { 8427 // Virtual bases are handled below. 8428 if (Base->isVirtual()) 8429 continue; 8430 8431 CXXRecordDecl *BaseClassDecl 8432 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8433 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8434 &HasConstCopyConstructor); 8435 } 8436 8437 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8438 BaseEnd = ClassDecl->vbases_end(); 8439 HasConstCopyConstructor && Base != BaseEnd; 8440 ++Base) { 8441 CXXRecordDecl *BaseClassDecl 8442 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8443 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8444 &HasConstCopyConstructor); 8445 } 8446 8447 // -- for all the nonstatic data members of X that are of a 8448 // class type M (or array thereof), each such class type 8449 // has a copy constructor whose first parameter is of type 8450 // const M& or const volatile M&. 8451 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8452 FieldEnd = ClassDecl->field_end(); 8453 HasConstCopyConstructor && Field != FieldEnd; 8454 ++Field) { 8455 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8456 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8457 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8458 &HasConstCopyConstructor); 8459 } 8460 } 8461 // Otherwise, the implicitly declared copy constructor will have 8462 // the form 8463 // 8464 // X::X(X&) 8465 8466 // C++ [except.spec]p14: 8467 // An implicitly declared special member function (Clause 12) shall have an 8468 // exception-specification. [...] 8469 ImplicitExceptionSpecification ExceptSpec(Context); 8470 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8471 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8472 BaseEnd = ClassDecl->bases_end(); 8473 Base != BaseEnd; 8474 ++Base) { 8475 // Virtual bases are handled below. 8476 if (Base->isVirtual()) 8477 continue; 8478 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::base_class_iterator Base = ClassDecl->vbases_begin(), 8486 BaseEnd = ClassDecl->vbases_end(); 8487 Base != BaseEnd; 8488 ++Base) { 8489 CXXRecordDecl *BaseClassDecl 8490 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8491 if (CXXConstructorDecl *CopyConstructor = 8492 LookupCopyingConstructor(BaseClassDecl, Quals)) 8493 ExceptSpec.CalledDecl(CopyConstructor); 8494 } 8495 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8496 FieldEnd = ClassDecl->field_end(); 8497 Field != FieldEnd; 8498 ++Field) { 8499 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8500 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8501 if (CXXConstructorDecl *CopyConstructor = 8502 LookupCopyingConstructor(FieldClassDecl, Quals)) 8503 ExceptSpec.CalledDecl(CopyConstructor); 8504 } 8505 } 8506 8507 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8508} 8509 8510CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8511 CXXRecordDecl *ClassDecl) { 8512 // C++ [class.copy]p4: 8513 // If the class definition does not explicitly declare a copy 8514 // constructor, one is declared implicitly. 8515 8516 ImplicitExceptionSpecification Spec(Context); 8517 bool Const; 8518 llvm::tie(Spec, Const) = 8519 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8520 8521 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8522 QualType ArgType = ClassType; 8523 if (Const) 8524 ArgType = ArgType.withConst(); 8525 ArgType = Context.getLValueReferenceType(ArgType); 8526 8527 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8528 8529 DeclarationName Name 8530 = Context.DeclarationNames.getCXXConstructorName( 8531 Context.getCanonicalType(ClassType)); 8532 SourceLocation ClassLoc = ClassDecl->getLocation(); 8533 DeclarationNameInfo NameInfo(Name, ClassLoc); 8534 8535 // An implicitly-declared copy constructor is an inline public 8536 // member of its class. 8537 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8538 Context, ClassDecl, ClassLoc, NameInfo, 8539 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8540 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8541 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8542 getLangOptions().CPlusPlus0x); 8543 CopyConstructor->setAccess(AS_public); 8544 CopyConstructor->setDefaulted(); 8545 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8546 8547 // Note that we have declared this constructor. 8548 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8549 8550 // Add the parameter to the constructor. 8551 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8552 ClassLoc, ClassLoc, 8553 /*IdentifierInfo=*/0, 8554 ArgType, /*TInfo=*/0, 8555 SC_None, 8556 SC_None, 0); 8557 CopyConstructor->setParams(FromParam); 8558 8559 if (Scope *S = getScopeForContext(ClassDecl)) 8560 PushOnScopeChains(CopyConstructor, S, false); 8561 ClassDecl->addDecl(CopyConstructor); 8562 8563 // C++11 [class.copy]p8: 8564 // ... If the class definition does not explicitly declare a copy 8565 // constructor, there is no user-declared move constructor, and there is no 8566 // user-declared move assignment operator, a copy constructor is implicitly 8567 // declared as defaulted. 8568 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8569 (ClassDecl->hasUserDeclaredMoveAssignment() && 8570 !getLangOptions().MicrosoftMode) || 8571 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8572 CopyConstructor->setDeletedAsWritten(); 8573 8574 return CopyConstructor; 8575} 8576 8577void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8578 CXXConstructorDecl *CopyConstructor) { 8579 assert((CopyConstructor->isDefaulted() && 8580 CopyConstructor->isCopyConstructor() && 8581 !CopyConstructor->doesThisDeclarationHaveABody() && 8582 !CopyConstructor->isDeleted()) && 8583 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8584 8585 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8586 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8587 8588 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8589 DiagnosticErrorTrap Trap(Diags); 8590 8591 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8592 Trap.hasErrorOccurred()) { 8593 Diag(CurrentLocation, diag::note_member_synthesized_at) 8594 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8595 CopyConstructor->setInvalidDecl(); 8596 } else { 8597 Sema::CompoundScopeRAII CompoundScope(*this); 8598 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8599 CopyConstructor->getLocation(), 8600 MultiStmtArg(*this, 0, 0), 8601 /*isStmtExpr=*/false) 8602 .takeAs<Stmt>()); 8603 CopyConstructor->setImplicitlyDefined(true); 8604 } 8605 8606 CopyConstructor->setUsed(); 8607 if (ASTMutationListener *L = getASTMutationListener()) { 8608 L->CompletedImplicitDefinition(CopyConstructor); 8609 } 8610} 8611 8612Sema::ImplicitExceptionSpecification 8613Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8614 // C++ [except.spec]p14: 8615 // An implicitly declared special member function (Clause 12) shall have an 8616 // exception-specification. [...] 8617 ImplicitExceptionSpecification ExceptSpec(Context); 8618 if (ClassDecl->isInvalidDecl()) 8619 return ExceptSpec; 8620 8621 // Direct base-class constructors. 8622 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8623 BEnd = ClassDecl->bases_end(); 8624 B != BEnd; ++B) { 8625 if (B->isVirtual()) // Handled below. 8626 continue; 8627 8628 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8629 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8630 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8631 // If this is a deleted function, add it anyway. This might be conformant 8632 // with the standard. This might not. I'm not sure. It might not matter. 8633 if (Constructor) 8634 ExceptSpec.CalledDecl(Constructor); 8635 } 8636 } 8637 8638 // Virtual base-class constructors. 8639 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8640 BEnd = ClassDecl->vbases_end(); 8641 B != BEnd; ++B) { 8642 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8643 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8644 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8645 // If this is a deleted function, add it anyway. This might be conformant 8646 // with the standard. This might not. I'm not sure. It might not matter. 8647 if (Constructor) 8648 ExceptSpec.CalledDecl(Constructor); 8649 } 8650 } 8651 8652 // Field constructors. 8653 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8654 FEnd = ClassDecl->field_end(); 8655 F != FEnd; ++F) { 8656 if (const RecordType *RecordTy 8657 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8658 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8659 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8660 // If this is a deleted function, add it anyway. This might be conformant 8661 // with the standard. This might not. I'm not sure. It might not matter. 8662 // In particular, the problem is that this function never gets called. It 8663 // might just be ill-formed because this function attempts to refer to 8664 // a deleted function here. 8665 if (Constructor) 8666 ExceptSpec.CalledDecl(Constructor); 8667 } 8668 } 8669 8670 return ExceptSpec; 8671} 8672 8673CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8674 CXXRecordDecl *ClassDecl) { 8675 ImplicitExceptionSpecification Spec( 8676 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8677 8678 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8679 QualType ArgType = Context.getRValueReferenceType(ClassType); 8680 8681 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8682 8683 DeclarationName Name 8684 = Context.DeclarationNames.getCXXConstructorName( 8685 Context.getCanonicalType(ClassType)); 8686 SourceLocation ClassLoc = ClassDecl->getLocation(); 8687 DeclarationNameInfo NameInfo(Name, ClassLoc); 8688 8689 // C++0x [class.copy]p11: 8690 // An implicitly-declared copy/move constructor is an inline public 8691 // member of its class. 8692 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8693 Context, ClassDecl, ClassLoc, NameInfo, 8694 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8695 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8696 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8697 getLangOptions().CPlusPlus0x); 8698 MoveConstructor->setAccess(AS_public); 8699 MoveConstructor->setDefaulted(); 8700 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8701 8702 // Add the parameter to the constructor. 8703 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8704 ClassLoc, ClassLoc, 8705 /*IdentifierInfo=*/0, 8706 ArgType, /*TInfo=*/0, 8707 SC_None, 8708 SC_None, 0); 8709 MoveConstructor->setParams(FromParam); 8710 8711 // C++0x [class.copy]p9: 8712 // If the definition of a class X does not explicitly declare a move 8713 // constructor, one will be implicitly declared as defaulted if and only if: 8714 // [...] 8715 // - the move constructor would not be implicitly defined as deleted. 8716 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8717 // Cache this result so that we don't try to generate this over and over 8718 // on every lookup, leaking memory and wasting time. 8719 ClassDecl->setFailedImplicitMoveConstructor(); 8720 return 0; 8721 } 8722 8723 // Note that we have declared this constructor. 8724 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8725 8726 if (Scope *S = getScopeForContext(ClassDecl)) 8727 PushOnScopeChains(MoveConstructor, S, false); 8728 ClassDecl->addDecl(MoveConstructor); 8729 8730 return MoveConstructor; 8731} 8732 8733void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8734 CXXConstructorDecl *MoveConstructor) { 8735 assert((MoveConstructor->isDefaulted() && 8736 MoveConstructor->isMoveConstructor() && 8737 !MoveConstructor->doesThisDeclarationHaveABody() && 8738 !MoveConstructor->isDeleted()) && 8739 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8740 8741 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8742 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8743 8744 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8745 DiagnosticErrorTrap Trap(Diags); 8746 8747 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8748 Trap.hasErrorOccurred()) { 8749 Diag(CurrentLocation, diag::note_member_synthesized_at) 8750 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8751 MoveConstructor->setInvalidDecl(); 8752 } else { 8753 Sema::CompoundScopeRAII CompoundScope(*this); 8754 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8755 MoveConstructor->getLocation(), 8756 MultiStmtArg(*this, 0, 0), 8757 /*isStmtExpr=*/false) 8758 .takeAs<Stmt>()); 8759 MoveConstructor->setImplicitlyDefined(true); 8760 } 8761 8762 MoveConstructor->setUsed(); 8763 8764 if (ASTMutationListener *L = getASTMutationListener()) { 8765 L->CompletedImplicitDefinition(MoveConstructor); 8766 } 8767} 8768 8769bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8770 return FD->isDeleted() && 8771 (FD->isDefaulted() || FD->isImplicit()) && 8772 isa<CXXMethodDecl>(FD); 8773} 8774 8775/// \brief Mark the call operator of the given lambda closure type as "used". 8776static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8777 CXXMethodDecl *CallOperator 8778 = cast<CXXMethodDecl>( 8779 *Lambda->lookup( 8780 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8781 CallOperator->setReferenced(); 8782 CallOperator->setUsed(); 8783} 8784 8785void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8786 SourceLocation CurrentLocation, 8787 CXXConversionDecl *Conv) 8788{ 8789 CXXRecordDecl *Lambda = Conv->getParent(); 8790 8791 // Make sure that the lambda call operator is marked used. 8792 markLambdaCallOperatorUsed(*this, Lambda); 8793 8794 Conv->setUsed(); 8795 8796 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8797 DiagnosticErrorTrap Trap(Diags); 8798 8799 // Return the address of the __invoke function. 8800 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8801 CXXMethodDecl *Invoke 8802 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8803 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8804 VK_LValue, Conv->getLocation()).take(); 8805 assert(FunctionRef && "Can't refer to __invoke function?"); 8806 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8807 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8808 Conv->getLocation(), 8809 Conv->getLocation())); 8810 8811 // Fill in the __invoke function with a dummy implementation. IR generation 8812 // will fill in the actual details. 8813 Invoke->setUsed(); 8814 Invoke->setReferenced(); 8815 Invoke->setBody(new (Context) CompoundStmt(Context, 0, 0, Conv->getLocation(), 8816 Conv->getLocation())); 8817 8818 if (ASTMutationListener *L = getASTMutationListener()) { 8819 L->CompletedImplicitDefinition(Conv); 8820 L->CompletedImplicitDefinition(Invoke); 8821 } 8822} 8823 8824void Sema::DefineImplicitLambdaToBlockPointerConversion( 8825 SourceLocation CurrentLocation, 8826 CXXConversionDecl *Conv) 8827{ 8828 CXXRecordDecl *Lambda = Conv->getParent(); 8829 8830 // Make sure that the lambda call operator is marked used. 8831 CXXMethodDecl *CallOperator 8832 = cast<CXXMethodDecl>( 8833 *Lambda->lookup( 8834 Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8835 CallOperator->setReferenced(); 8836 CallOperator->setUsed(); 8837 Conv->setUsed(); 8838 8839 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8840 DiagnosticErrorTrap Trap(Diags); 8841 8842 // Copy-initialize the lambda object as needed to capture it. 8843 Expr *This = ActOnCXXThis(CurrentLocation).take(); 8844 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 8845 ExprResult Init = PerformCopyInitialization( 8846 InitializedEntity::InitializeBlock(CurrentLocation, 8847 DerefThis->getType(), 8848 /*NRVO=*/false), 8849 CurrentLocation, DerefThis); 8850 if (!Init.isInvalid()) 8851 Init = ActOnFinishFullExpr(Init.take()); 8852 8853 if (Init.isInvalid()) { 8854 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8855 Conv->setInvalidDecl(); 8856 return; 8857 } 8858 8859 // Create the new block to be returned. 8860 BlockDecl *Block = BlockDecl::Create(Context, Conv, Conv->getLocation()); 8861 8862 // Set the type information. 8863 Block->setSignatureAsWritten(CallOperator->getTypeSourceInfo()); 8864 Block->setIsVariadic(CallOperator->isVariadic()); 8865 Block->setBlockMissingReturnType(false); 8866 8867 // Add parameters. 8868 SmallVector<ParmVarDecl *, 4> BlockParams; 8869 for (unsigned I = 0, N = CallOperator->getNumParams(); I != N; ++I) { 8870 ParmVarDecl *From = CallOperator->getParamDecl(I); 8871 BlockParams.push_back(ParmVarDecl::Create(Context, Block, 8872 From->getLocStart(), 8873 From->getLocation(), 8874 From->getIdentifier(), 8875 From->getType(), 8876 From->getTypeSourceInfo(), 8877 From->getStorageClass(), 8878 From->getStorageClassAsWritten(), 8879 /*DefaultArg=*/0)); 8880 } 8881 Block->setParams(BlockParams); 8882 8883 // Add capture. The capture uses a fake variable, which doesn't correspond 8884 // to any actual memory location. However, the initializer copy-initializes 8885 // the lambda object. 8886 TypeSourceInfo *CapVarTSI = 8887 Context.getTrivialTypeSourceInfo(DerefThis->getType()); 8888 VarDecl *CapVar = VarDecl::Create(Context, Block, Conv->getLocation(), 8889 Conv->getLocation(), 0, 8890 DerefThis->getType(), CapVarTSI, 8891 SC_None, SC_None); 8892 BlockDecl::Capture Capture(/*Variable=*/CapVar, /*ByRef=*/false, 8893 /*Nested=*/false, /*Copy=*/Init.take()); 8894 Block->setCaptures(Context, &Capture, &Capture + 1, 8895 /*CapturesCXXThis=*/false); 8896 8897 // Add a fake function body to the block. IR generation is responsible 8898 // for filling in the actual body, which cannot be expressed as an AST. 8899 Block->setBody(new (Context) CompoundStmt(Context, 0, 0, 8900 Conv->getLocation(), 8901 Conv->getLocation())); 8902 8903 // Create the block literal expression. 8904 Expr *BuildBlock = new (Context) BlockExpr(Block, Conv->getConversionType()); 8905 ExprCleanupObjects.push_back(Block); 8906 ExprNeedsCleanups = true; 8907 8908 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 8909 // behavior. 8910 if (!getLangOptions().ObjCAutoRefCount) 8911 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock->getType(), 8912 CK_CopyAndAutoreleaseBlockObject, 8913 BuildBlock, 0, VK_RValue); 8914 8915 // Create the return statement that returns the block from the conversion 8916 // function. 8917 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock); 8918 if (Return.isInvalid()) { 8919 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8920 Conv->setInvalidDecl(); 8921 return; 8922 } 8923 8924 // Set the body of the conversion function. 8925 Stmt *ReturnS = Return.take(); 8926 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 8927 Conv->getLocation(), 8928 Conv->getLocation())); 8929 8930 // We're done; notify the mutation listener, if any. 8931 if (ASTMutationListener *L = getASTMutationListener()) { 8932 L->CompletedImplicitDefinition(Conv); 8933 } 8934} 8935 8936ExprResult 8937Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8938 CXXConstructorDecl *Constructor, 8939 MultiExprArg ExprArgs, 8940 bool HadMultipleCandidates, 8941 bool RequiresZeroInit, 8942 unsigned ConstructKind, 8943 SourceRange ParenRange) { 8944 bool Elidable = false; 8945 8946 // C++0x [class.copy]p34: 8947 // When certain criteria are met, an implementation is allowed to 8948 // omit the copy/move construction of a class object, even if the 8949 // copy/move constructor and/or destructor for the object have 8950 // side effects. [...] 8951 // - when a temporary class object that has not been bound to a 8952 // reference (12.2) would be copied/moved to a class object 8953 // with the same cv-unqualified type, the copy/move operation 8954 // can be omitted by constructing the temporary object 8955 // directly into the target of the omitted copy/move 8956 if (ConstructKind == CXXConstructExpr::CK_Complete && 8957 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8958 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8959 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8960 } 8961 8962 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8963 Elidable, move(ExprArgs), HadMultipleCandidates, 8964 RequiresZeroInit, ConstructKind, ParenRange); 8965} 8966 8967/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8968/// including handling of its default argument expressions. 8969ExprResult 8970Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8971 CXXConstructorDecl *Constructor, bool Elidable, 8972 MultiExprArg ExprArgs, 8973 bool HadMultipleCandidates, 8974 bool RequiresZeroInit, 8975 unsigned ConstructKind, 8976 SourceRange ParenRange) { 8977 unsigned NumExprs = ExprArgs.size(); 8978 Expr **Exprs = (Expr **)ExprArgs.release(); 8979 8980 for (specific_attr_iterator<NonNullAttr> 8981 i = Constructor->specific_attr_begin<NonNullAttr>(), 8982 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8983 const NonNullAttr *NonNull = *i; 8984 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8985 } 8986 8987 MarkFunctionReferenced(ConstructLoc, Constructor); 8988 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8989 Constructor, Elidable, Exprs, NumExprs, 8990 HadMultipleCandidates, /*FIXME*/false, 8991 RequiresZeroInit, 8992 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8993 ParenRange)); 8994} 8995 8996bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8997 CXXConstructorDecl *Constructor, 8998 MultiExprArg Exprs, 8999 bool HadMultipleCandidates) { 9000 // FIXME: Provide the correct paren SourceRange when available. 9001 ExprResult TempResult = 9002 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9003 move(Exprs), HadMultipleCandidates, false, 9004 CXXConstructExpr::CK_Complete, SourceRange()); 9005 if (TempResult.isInvalid()) 9006 return true; 9007 9008 Expr *Temp = TempResult.takeAs<Expr>(); 9009 CheckImplicitConversions(Temp, VD->getLocation()); 9010 MarkFunctionReferenced(VD->getLocation(), Constructor); 9011 Temp = MaybeCreateExprWithCleanups(Temp); 9012 VD->setInit(Temp); 9013 9014 return false; 9015} 9016 9017void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9018 if (VD->isInvalidDecl()) return; 9019 9020 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9021 if (ClassDecl->isInvalidDecl()) return; 9022 if (ClassDecl->hasIrrelevantDestructor()) return; 9023 if (ClassDecl->isDependentContext()) return; 9024 9025 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9026 MarkFunctionReferenced(VD->getLocation(), Destructor); 9027 CheckDestructorAccess(VD->getLocation(), Destructor, 9028 PDiag(diag::err_access_dtor_var) 9029 << VD->getDeclName() 9030 << VD->getType()); 9031 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9032 9033 if (!VD->hasGlobalStorage()) return; 9034 9035 // Emit warning for non-trivial dtor in global scope (a real global, 9036 // class-static, function-static). 9037 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9038 9039 // TODO: this should be re-enabled for static locals by !CXAAtExit 9040 if (!VD->isStaticLocal()) 9041 Diag(VD->getLocation(), diag::warn_global_destructor); 9042} 9043 9044/// \brief Given a constructor and the set of arguments provided for the 9045/// constructor, convert the arguments and add any required default arguments 9046/// to form a proper call to this constructor. 9047/// 9048/// \returns true if an error occurred, false otherwise. 9049bool 9050Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9051 MultiExprArg ArgsPtr, 9052 SourceLocation Loc, 9053 ASTOwningVector<Expr*> &ConvertedArgs, 9054 bool AllowExplicit) { 9055 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9056 unsigned NumArgs = ArgsPtr.size(); 9057 Expr **Args = (Expr **)ArgsPtr.get(); 9058 9059 const FunctionProtoType *Proto 9060 = Constructor->getType()->getAs<FunctionProtoType>(); 9061 assert(Proto && "Constructor without a prototype?"); 9062 unsigned NumArgsInProto = Proto->getNumArgs(); 9063 9064 // If too few arguments are available, we'll fill in the rest with defaults. 9065 if (NumArgs < NumArgsInProto) 9066 ConvertedArgs.reserve(NumArgsInProto); 9067 else 9068 ConvertedArgs.reserve(NumArgs); 9069 9070 VariadicCallType CallType = 9071 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9072 SmallVector<Expr *, 8> AllArgs; 9073 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9074 Proto, 0, Args, NumArgs, AllArgs, 9075 CallType, AllowExplicit); 9076 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9077 9078 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9079 9080 // FIXME: Missing call to CheckFunctionCall or equivalent 9081 9082 return Invalid; 9083} 9084 9085static inline bool 9086CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9087 const FunctionDecl *FnDecl) { 9088 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9089 if (isa<NamespaceDecl>(DC)) { 9090 return SemaRef.Diag(FnDecl->getLocation(), 9091 diag::err_operator_new_delete_declared_in_namespace) 9092 << FnDecl->getDeclName(); 9093 } 9094 9095 if (isa<TranslationUnitDecl>(DC) && 9096 FnDecl->getStorageClass() == SC_Static) { 9097 return SemaRef.Diag(FnDecl->getLocation(), 9098 diag::err_operator_new_delete_declared_static) 9099 << FnDecl->getDeclName(); 9100 } 9101 9102 return false; 9103} 9104 9105static inline bool 9106CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9107 CanQualType ExpectedResultType, 9108 CanQualType ExpectedFirstParamType, 9109 unsigned DependentParamTypeDiag, 9110 unsigned InvalidParamTypeDiag) { 9111 QualType ResultType = 9112 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9113 9114 // Check that the result type is not dependent. 9115 if (ResultType->isDependentType()) 9116 return SemaRef.Diag(FnDecl->getLocation(), 9117 diag::err_operator_new_delete_dependent_result_type) 9118 << FnDecl->getDeclName() << ExpectedResultType; 9119 9120 // Check that the result type is what we expect. 9121 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9122 return SemaRef.Diag(FnDecl->getLocation(), 9123 diag::err_operator_new_delete_invalid_result_type) 9124 << FnDecl->getDeclName() << ExpectedResultType; 9125 9126 // A function template must have at least 2 parameters. 9127 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9128 return SemaRef.Diag(FnDecl->getLocation(), 9129 diag::err_operator_new_delete_template_too_few_parameters) 9130 << FnDecl->getDeclName(); 9131 9132 // The function decl must have at least 1 parameter. 9133 if (FnDecl->getNumParams() == 0) 9134 return SemaRef.Diag(FnDecl->getLocation(), 9135 diag::err_operator_new_delete_too_few_parameters) 9136 << FnDecl->getDeclName(); 9137 9138 // Check the the first parameter type is not dependent. 9139 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9140 if (FirstParamType->isDependentType()) 9141 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9142 << FnDecl->getDeclName() << ExpectedFirstParamType; 9143 9144 // Check that the first parameter type is what we expect. 9145 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9146 ExpectedFirstParamType) 9147 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9148 << FnDecl->getDeclName() << ExpectedFirstParamType; 9149 9150 return false; 9151} 9152 9153static bool 9154CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9155 // C++ [basic.stc.dynamic.allocation]p1: 9156 // A program is ill-formed if an allocation function is declared in a 9157 // namespace scope other than global scope or declared static in global 9158 // scope. 9159 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9160 return true; 9161 9162 CanQualType SizeTy = 9163 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9164 9165 // C++ [basic.stc.dynamic.allocation]p1: 9166 // The return type shall be void*. The first parameter shall have type 9167 // std::size_t. 9168 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9169 SizeTy, 9170 diag::err_operator_new_dependent_param_type, 9171 diag::err_operator_new_param_type)) 9172 return true; 9173 9174 // C++ [basic.stc.dynamic.allocation]p1: 9175 // The first parameter shall not have an associated default argument. 9176 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9177 return SemaRef.Diag(FnDecl->getLocation(), 9178 diag::err_operator_new_default_arg) 9179 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9180 9181 return false; 9182} 9183 9184static bool 9185CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9186 // C++ [basic.stc.dynamic.deallocation]p1: 9187 // A program is ill-formed if deallocation functions are declared in a 9188 // namespace scope other than global scope or declared static in global 9189 // scope. 9190 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9191 return true; 9192 9193 // C++ [basic.stc.dynamic.deallocation]p2: 9194 // Each deallocation function shall return void and its first parameter 9195 // shall be void*. 9196 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9197 SemaRef.Context.VoidPtrTy, 9198 diag::err_operator_delete_dependent_param_type, 9199 diag::err_operator_delete_param_type)) 9200 return true; 9201 9202 return false; 9203} 9204 9205/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9206/// of this overloaded operator is well-formed. If so, returns false; 9207/// otherwise, emits appropriate diagnostics and returns true. 9208bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9209 assert(FnDecl && FnDecl->isOverloadedOperator() && 9210 "Expected an overloaded operator declaration"); 9211 9212 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9213 9214 // C++ [over.oper]p5: 9215 // The allocation and deallocation functions, operator new, 9216 // operator new[], operator delete and operator delete[], are 9217 // described completely in 3.7.3. The attributes and restrictions 9218 // found in the rest of this subclause do not apply to them unless 9219 // explicitly stated in 3.7.3. 9220 if (Op == OO_Delete || Op == OO_Array_Delete) 9221 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9222 9223 if (Op == OO_New || Op == OO_Array_New) 9224 return CheckOperatorNewDeclaration(*this, FnDecl); 9225 9226 // C++ [over.oper]p6: 9227 // An operator function shall either be a non-static member 9228 // function or be a non-member function and have at least one 9229 // parameter whose type is a class, a reference to a class, an 9230 // enumeration, or a reference to an enumeration. 9231 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9232 if (MethodDecl->isStatic()) 9233 return Diag(FnDecl->getLocation(), 9234 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9235 } else { 9236 bool ClassOrEnumParam = false; 9237 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9238 ParamEnd = FnDecl->param_end(); 9239 Param != ParamEnd; ++Param) { 9240 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9241 if (ParamType->isDependentType() || ParamType->isRecordType() || 9242 ParamType->isEnumeralType()) { 9243 ClassOrEnumParam = true; 9244 break; 9245 } 9246 } 9247 9248 if (!ClassOrEnumParam) 9249 return Diag(FnDecl->getLocation(), 9250 diag::err_operator_overload_needs_class_or_enum) 9251 << FnDecl->getDeclName(); 9252 } 9253 9254 // C++ [over.oper]p8: 9255 // An operator function cannot have default arguments (8.3.6), 9256 // except where explicitly stated below. 9257 // 9258 // Only the function-call operator allows default arguments 9259 // (C++ [over.call]p1). 9260 if (Op != OO_Call) { 9261 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9262 Param != FnDecl->param_end(); ++Param) { 9263 if ((*Param)->hasDefaultArg()) 9264 return Diag((*Param)->getLocation(), 9265 diag::err_operator_overload_default_arg) 9266 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9267 } 9268 } 9269 9270 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9271 { false, false, false } 9272#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9273 , { Unary, Binary, MemberOnly } 9274#include "clang/Basic/OperatorKinds.def" 9275 }; 9276 9277 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9278 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9279 bool MustBeMemberOperator = OperatorUses[Op][2]; 9280 9281 // C++ [over.oper]p8: 9282 // [...] Operator functions cannot have more or fewer parameters 9283 // than the number required for the corresponding operator, as 9284 // described in the rest of this subclause. 9285 unsigned NumParams = FnDecl->getNumParams() 9286 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9287 if (Op != OO_Call && 9288 ((NumParams == 1 && !CanBeUnaryOperator) || 9289 (NumParams == 2 && !CanBeBinaryOperator) || 9290 (NumParams < 1) || (NumParams > 2))) { 9291 // We have the wrong number of parameters. 9292 unsigned ErrorKind; 9293 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9294 ErrorKind = 2; // 2 -> unary or binary. 9295 } else if (CanBeUnaryOperator) { 9296 ErrorKind = 0; // 0 -> unary 9297 } else { 9298 assert(CanBeBinaryOperator && 9299 "All non-call overloaded operators are unary or binary!"); 9300 ErrorKind = 1; // 1 -> binary 9301 } 9302 9303 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9304 << FnDecl->getDeclName() << NumParams << ErrorKind; 9305 } 9306 9307 // Overloaded operators other than operator() cannot be variadic. 9308 if (Op != OO_Call && 9309 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9310 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9311 << FnDecl->getDeclName(); 9312 } 9313 9314 // Some operators must be non-static member functions. 9315 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9316 return Diag(FnDecl->getLocation(), 9317 diag::err_operator_overload_must_be_member) 9318 << FnDecl->getDeclName(); 9319 } 9320 9321 // C++ [over.inc]p1: 9322 // The user-defined function called operator++ implements the 9323 // prefix and postfix ++ operator. If this function is a member 9324 // function with no parameters, or a non-member function with one 9325 // parameter of class or enumeration type, it defines the prefix 9326 // increment operator ++ for objects of that type. If the function 9327 // is a member function with one parameter (which shall be of type 9328 // int) or a non-member function with two parameters (the second 9329 // of which shall be of type int), it defines the postfix 9330 // increment operator ++ for objects of that type. 9331 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9332 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9333 bool ParamIsInt = false; 9334 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9335 ParamIsInt = BT->getKind() == BuiltinType::Int; 9336 9337 if (!ParamIsInt) 9338 return Diag(LastParam->getLocation(), 9339 diag::err_operator_overload_post_incdec_must_be_int) 9340 << LastParam->getType() << (Op == OO_MinusMinus); 9341 } 9342 9343 return false; 9344} 9345 9346/// CheckLiteralOperatorDeclaration - Check whether the declaration 9347/// of this literal operator function is well-formed. If so, returns 9348/// false; otherwise, emits appropriate diagnostics and returns true. 9349bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9350 DeclContext *DC = FnDecl->getDeclContext(); 9351 Decl::Kind Kind = DC->getDeclKind(); 9352 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9353 Kind != Decl::LinkageSpec) { 9354 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9355 << FnDecl->getDeclName(); 9356 return true; 9357 } 9358 9359 bool Valid = false; 9360 9361 // template <char...> type operator "" name() is the only valid template 9362 // signature, and the only valid signature with no parameters. 9363 if (FnDecl->param_size() == 0) { 9364 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9365 // Must have only one template parameter 9366 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9367 if (Params->size() == 1) { 9368 NonTypeTemplateParmDecl *PmDecl = 9369 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9370 9371 // The template parameter must be a char parameter pack. 9372 if (PmDecl && PmDecl->isTemplateParameterPack() && 9373 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9374 Valid = true; 9375 } 9376 } 9377 } else { 9378 // Check the first parameter 9379 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9380 9381 QualType T = (*Param)->getType(); 9382 9383 // unsigned long long int, long double, and any character type are allowed 9384 // as the only parameters. 9385 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9386 Context.hasSameType(T, Context.LongDoubleTy) || 9387 Context.hasSameType(T, Context.CharTy) || 9388 Context.hasSameType(T, Context.WCharTy) || 9389 Context.hasSameType(T, Context.Char16Ty) || 9390 Context.hasSameType(T, Context.Char32Ty)) { 9391 if (++Param == FnDecl->param_end()) 9392 Valid = true; 9393 goto FinishedParams; 9394 } 9395 9396 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9397 const PointerType *PT = T->getAs<PointerType>(); 9398 if (!PT) 9399 goto FinishedParams; 9400 T = PT->getPointeeType(); 9401 if (!T.isConstQualified()) 9402 goto FinishedParams; 9403 T = T.getUnqualifiedType(); 9404 9405 // Move on to the second parameter; 9406 ++Param; 9407 9408 // If there is no second parameter, the first must be a const char * 9409 if (Param == FnDecl->param_end()) { 9410 if (Context.hasSameType(T, Context.CharTy)) 9411 Valid = true; 9412 goto FinishedParams; 9413 } 9414 9415 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9416 // are allowed as the first parameter to a two-parameter function 9417 if (!(Context.hasSameType(T, Context.CharTy) || 9418 Context.hasSameType(T, Context.WCharTy) || 9419 Context.hasSameType(T, Context.Char16Ty) || 9420 Context.hasSameType(T, Context.Char32Ty))) 9421 goto FinishedParams; 9422 9423 // The second and final parameter must be an std::size_t 9424 T = (*Param)->getType().getUnqualifiedType(); 9425 if (Context.hasSameType(T, Context.getSizeType()) && 9426 ++Param == FnDecl->param_end()) 9427 Valid = true; 9428 } 9429 9430 // FIXME: This diagnostic is absolutely terrible. 9431FinishedParams: 9432 if (!Valid) { 9433 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9434 << FnDecl->getDeclName(); 9435 return true; 9436 } 9437 9438 StringRef LiteralName 9439 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9440 if (LiteralName[0] != '_') { 9441 // C++0x [usrlit.suffix]p1: 9442 // Literal suffix identifiers that do not start with an underscore are 9443 // reserved for future standardization. 9444 bool IsHexFloat = true; 9445 if (LiteralName.size() > 1 && 9446 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9447 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9448 if (!isdigit(LiteralName[I])) { 9449 IsHexFloat = false; 9450 break; 9451 } 9452 } 9453 } 9454 9455 if (IsHexFloat) 9456 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9457 << LiteralName; 9458 else 9459 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9460 } 9461 9462 return false; 9463} 9464 9465/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9466/// linkage specification, including the language and (if present) 9467/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9468/// the location of the language string literal, which is provided 9469/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9470/// the '{' brace. Otherwise, this linkage specification does not 9471/// have any braces. 9472Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9473 SourceLocation LangLoc, 9474 StringRef Lang, 9475 SourceLocation LBraceLoc) { 9476 LinkageSpecDecl::LanguageIDs Language; 9477 if (Lang == "\"C\"") 9478 Language = LinkageSpecDecl::lang_c; 9479 else if (Lang == "\"C++\"") 9480 Language = LinkageSpecDecl::lang_cxx; 9481 else { 9482 Diag(LangLoc, diag::err_bad_language); 9483 return 0; 9484 } 9485 9486 // FIXME: Add all the various semantics of linkage specifications 9487 9488 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9489 ExternLoc, LangLoc, Language); 9490 CurContext->addDecl(D); 9491 PushDeclContext(S, D); 9492 return D; 9493} 9494 9495/// ActOnFinishLinkageSpecification - Complete the definition of 9496/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9497/// valid, it's the position of the closing '}' brace in a linkage 9498/// specification that uses braces. 9499Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9500 Decl *LinkageSpec, 9501 SourceLocation RBraceLoc) { 9502 if (LinkageSpec) { 9503 if (RBraceLoc.isValid()) { 9504 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9505 LSDecl->setRBraceLoc(RBraceLoc); 9506 } 9507 PopDeclContext(); 9508 } 9509 return LinkageSpec; 9510} 9511 9512/// \brief Perform semantic analysis for the variable declaration that 9513/// occurs within a C++ catch clause, returning the newly-created 9514/// variable. 9515VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9516 TypeSourceInfo *TInfo, 9517 SourceLocation StartLoc, 9518 SourceLocation Loc, 9519 IdentifierInfo *Name) { 9520 bool Invalid = false; 9521 QualType ExDeclType = TInfo->getType(); 9522 9523 // Arrays and functions decay. 9524 if (ExDeclType->isArrayType()) 9525 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9526 else if (ExDeclType->isFunctionType()) 9527 ExDeclType = Context.getPointerType(ExDeclType); 9528 9529 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9530 // The exception-declaration shall not denote a pointer or reference to an 9531 // incomplete type, other than [cv] void*. 9532 // N2844 forbids rvalue references. 9533 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9534 Diag(Loc, diag::err_catch_rvalue_ref); 9535 Invalid = true; 9536 } 9537 9538 QualType BaseType = ExDeclType; 9539 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9540 unsigned DK = diag::err_catch_incomplete; 9541 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9542 BaseType = Ptr->getPointeeType(); 9543 Mode = 1; 9544 DK = diag::err_catch_incomplete_ptr; 9545 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9546 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9547 BaseType = Ref->getPointeeType(); 9548 Mode = 2; 9549 DK = diag::err_catch_incomplete_ref; 9550 } 9551 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9552 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9553 Invalid = true; 9554 9555 if (!Invalid && !ExDeclType->isDependentType() && 9556 RequireNonAbstractType(Loc, ExDeclType, 9557 diag::err_abstract_type_in_decl, 9558 AbstractVariableType)) 9559 Invalid = true; 9560 9561 // Only the non-fragile NeXT runtime currently supports C++ catches 9562 // of ObjC types, and no runtime supports catching ObjC types by value. 9563 if (!Invalid && getLangOptions().ObjC1) { 9564 QualType T = ExDeclType; 9565 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9566 T = RT->getPointeeType(); 9567 9568 if (T->isObjCObjectType()) { 9569 Diag(Loc, diag::err_objc_object_catch); 9570 Invalid = true; 9571 } else if (T->isObjCObjectPointerType()) { 9572 if (!getLangOptions().ObjCNonFragileABI) 9573 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9574 } 9575 } 9576 9577 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9578 ExDeclType, TInfo, SC_None, SC_None); 9579 ExDecl->setExceptionVariable(true); 9580 9581 // In ARC, infer 'retaining' for variables of retainable type. 9582 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9583 Invalid = true; 9584 9585 if (!Invalid && !ExDeclType->isDependentType()) { 9586 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9587 // C++ [except.handle]p16: 9588 // The object declared in an exception-declaration or, if the 9589 // exception-declaration does not specify a name, a temporary (12.2) is 9590 // copy-initialized (8.5) from the exception object. [...] 9591 // The object is destroyed when the handler exits, after the destruction 9592 // of any automatic objects initialized within the handler. 9593 // 9594 // We just pretend to initialize the object with itself, then make sure 9595 // it can be destroyed later. 9596 QualType initType = ExDeclType; 9597 9598 InitializedEntity entity = 9599 InitializedEntity::InitializeVariable(ExDecl); 9600 InitializationKind initKind = 9601 InitializationKind::CreateCopy(Loc, SourceLocation()); 9602 9603 Expr *opaqueValue = 9604 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9605 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9606 ExprResult result = sequence.Perform(*this, entity, initKind, 9607 MultiExprArg(&opaqueValue, 1)); 9608 if (result.isInvalid()) 9609 Invalid = true; 9610 else { 9611 // If the constructor used was non-trivial, set this as the 9612 // "initializer". 9613 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9614 if (!construct->getConstructor()->isTrivial()) { 9615 Expr *init = MaybeCreateExprWithCleanups(construct); 9616 ExDecl->setInit(init); 9617 } 9618 9619 // And make sure it's destructable. 9620 FinalizeVarWithDestructor(ExDecl, recordType); 9621 } 9622 } 9623 } 9624 9625 if (Invalid) 9626 ExDecl->setInvalidDecl(); 9627 9628 return ExDecl; 9629} 9630 9631/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9632/// handler. 9633Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9634 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9635 bool Invalid = D.isInvalidType(); 9636 9637 // Check for unexpanded parameter packs. 9638 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9639 UPPC_ExceptionType)) { 9640 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9641 D.getIdentifierLoc()); 9642 Invalid = true; 9643 } 9644 9645 IdentifierInfo *II = D.getIdentifier(); 9646 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9647 LookupOrdinaryName, 9648 ForRedeclaration)) { 9649 // The scope should be freshly made just for us. There is just no way 9650 // it contains any previous declaration. 9651 assert(!S->isDeclScope(PrevDecl)); 9652 if (PrevDecl->isTemplateParameter()) { 9653 // Maybe we will complain about the shadowed template parameter. 9654 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9655 PrevDecl = 0; 9656 } 9657 } 9658 9659 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9660 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9661 << D.getCXXScopeSpec().getRange(); 9662 Invalid = true; 9663 } 9664 9665 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9666 D.getSourceRange().getBegin(), 9667 D.getIdentifierLoc(), 9668 D.getIdentifier()); 9669 if (Invalid) 9670 ExDecl->setInvalidDecl(); 9671 9672 // Add the exception declaration into this scope. 9673 if (II) 9674 PushOnScopeChains(ExDecl, S); 9675 else 9676 CurContext->addDecl(ExDecl); 9677 9678 ProcessDeclAttributes(S, ExDecl, D); 9679 return ExDecl; 9680} 9681 9682Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9683 Expr *AssertExpr, 9684 Expr *AssertMessageExpr_, 9685 SourceLocation RParenLoc) { 9686 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9687 9688 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9689 // In a static_assert-declaration, the constant-expression shall be a 9690 // constant expression that can be contextually converted to bool. 9691 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9692 if (Converted.isInvalid()) 9693 return 0; 9694 9695 llvm::APSInt Cond; 9696 if (VerifyIntegerConstantExpression(Converted.get(), &Cond, 9697 PDiag(diag::err_static_assert_expression_is_not_constant), 9698 /*AllowFold=*/false).isInvalid()) 9699 return 0; 9700 9701 if (!Cond) 9702 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9703 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9704 } 9705 9706 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9707 return 0; 9708 9709 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9710 AssertExpr, AssertMessage, RParenLoc); 9711 9712 CurContext->addDecl(Decl); 9713 return Decl; 9714} 9715 9716/// \brief Perform semantic analysis of the given friend type declaration. 9717/// 9718/// \returns A friend declaration that. 9719FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9720 SourceLocation FriendLoc, 9721 TypeSourceInfo *TSInfo) { 9722 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9723 9724 QualType T = TSInfo->getType(); 9725 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9726 9727 // C++03 [class.friend]p2: 9728 // An elaborated-type-specifier shall be used in a friend declaration 9729 // for a class.* 9730 // 9731 // * The class-key of the elaborated-type-specifier is required. 9732 if (!ActiveTemplateInstantiations.empty()) { 9733 // Do not complain about the form of friend template types during 9734 // template instantiation; we will already have complained when the 9735 // template was declared. 9736 } else if (!T->isElaboratedTypeSpecifier()) { 9737 // If we evaluated the type to a record type, suggest putting 9738 // a tag in front. 9739 if (const RecordType *RT = T->getAs<RecordType>()) { 9740 RecordDecl *RD = RT->getDecl(); 9741 9742 std::string InsertionText = std::string(" ") + RD->getKindName(); 9743 9744 Diag(TypeRange.getBegin(), 9745 getLangOptions().CPlusPlus0x ? 9746 diag::warn_cxx98_compat_unelaborated_friend_type : 9747 diag::ext_unelaborated_friend_type) 9748 << (unsigned) RD->getTagKind() 9749 << T 9750 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9751 InsertionText); 9752 } else { 9753 Diag(FriendLoc, 9754 getLangOptions().CPlusPlus0x ? 9755 diag::warn_cxx98_compat_nonclass_type_friend : 9756 diag::ext_nonclass_type_friend) 9757 << T 9758 << SourceRange(FriendLoc, TypeRange.getEnd()); 9759 } 9760 } else if (T->getAs<EnumType>()) { 9761 Diag(FriendLoc, 9762 getLangOptions().CPlusPlus0x ? 9763 diag::warn_cxx98_compat_enum_friend : 9764 diag::ext_enum_friend) 9765 << T 9766 << SourceRange(FriendLoc, TypeRange.getEnd()); 9767 } 9768 9769 // C++0x [class.friend]p3: 9770 // If the type specifier in a friend declaration designates a (possibly 9771 // cv-qualified) class type, that class is declared as a friend; otherwise, 9772 // the friend declaration is ignored. 9773 9774 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9775 // in [class.friend]p3 that we do not implement. 9776 9777 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9778} 9779 9780/// Handle a friend tag declaration where the scope specifier was 9781/// templated. 9782Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9783 unsigned TagSpec, SourceLocation TagLoc, 9784 CXXScopeSpec &SS, 9785 IdentifierInfo *Name, SourceLocation NameLoc, 9786 AttributeList *Attr, 9787 MultiTemplateParamsArg TempParamLists) { 9788 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9789 9790 bool isExplicitSpecialization = false; 9791 bool Invalid = false; 9792 9793 if (TemplateParameterList *TemplateParams 9794 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9795 TempParamLists.get(), 9796 TempParamLists.size(), 9797 /*friend*/ true, 9798 isExplicitSpecialization, 9799 Invalid)) { 9800 if (TemplateParams->size() > 0) { 9801 // This is a declaration of a class template. 9802 if (Invalid) 9803 return 0; 9804 9805 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9806 SS, Name, NameLoc, Attr, 9807 TemplateParams, AS_public, 9808 /*ModulePrivateLoc=*/SourceLocation(), 9809 TempParamLists.size() - 1, 9810 (TemplateParameterList**) TempParamLists.release()).take(); 9811 } else { 9812 // The "template<>" header is extraneous. 9813 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9814 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9815 isExplicitSpecialization = true; 9816 } 9817 } 9818 9819 if (Invalid) return 0; 9820 9821 bool isAllExplicitSpecializations = true; 9822 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9823 if (TempParamLists.get()[I]->size()) { 9824 isAllExplicitSpecializations = false; 9825 break; 9826 } 9827 } 9828 9829 // FIXME: don't ignore attributes. 9830 9831 // If it's explicit specializations all the way down, just forget 9832 // about the template header and build an appropriate non-templated 9833 // friend. TODO: for source fidelity, remember the headers. 9834 if (isAllExplicitSpecializations) { 9835 if (SS.isEmpty()) { 9836 bool Owned = false; 9837 bool IsDependent = false; 9838 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9839 Attr, AS_public, 9840 /*ModulePrivateLoc=*/SourceLocation(), 9841 MultiTemplateParamsArg(), Owned, IsDependent, 9842 /*ScopedEnumKWLoc=*/SourceLocation(), 9843 /*ScopedEnumUsesClassTag=*/false, 9844 /*UnderlyingType=*/TypeResult()); 9845 } 9846 9847 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9848 ElaboratedTypeKeyword Keyword 9849 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9850 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9851 *Name, NameLoc); 9852 if (T.isNull()) 9853 return 0; 9854 9855 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9856 if (isa<DependentNameType>(T)) { 9857 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9858 TL.setElaboratedKeywordLoc(TagLoc); 9859 TL.setQualifierLoc(QualifierLoc); 9860 TL.setNameLoc(NameLoc); 9861 } else { 9862 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9863 TL.setElaboratedKeywordLoc(TagLoc); 9864 TL.setQualifierLoc(QualifierLoc); 9865 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9866 } 9867 9868 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9869 TSI, FriendLoc); 9870 Friend->setAccess(AS_public); 9871 CurContext->addDecl(Friend); 9872 return Friend; 9873 } 9874 9875 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9876 9877 9878 9879 // Handle the case of a templated-scope friend class. e.g. 9880 // template <class T> class A<T>::B; 9881 // FIXME: we don't support these right now. 9882 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9883 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9884 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9885 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9886 TL.setElaboratedKeywordLoc(TagLoc); 9887 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9888 TL.setNameLoc(NameLoc); 9889 9890 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9891 TSI, FriendLoc); 9892 Friend->setAccess(AS_public); 9893 Friend->setUnsupportedFriend(true); 9894 CurContext->addDecl(Friend); 9895 return Friend; 9896} 9897 9898 9899/// Handle a friend type declaration. This works in tandem with 9900/// ActOnTag. 9901/// 9902/// Notes on friend class templates: 9903/// 9904/// We generally treat friend class declarations as if they were 9905/// declaring a class. So, for example, the elaborated type specifier 9906/// in a friend declaration is required to obey the restrictions of a 9907/// class-head (i.e. no typedefs in the scope chain), template 9908/// parameters are required to match up with simple template-ids, &c. 9909/// However, unlike when declaring a template specialization, it's 9910/// okay to refer to a template specialization without an empty 9911/// template parameter declaration, e.g. 9912/// friend class A<T>::B<unsigned>; 9913/// We permit this as a special case; if there are any template 9914/// parameters present at all, require proper matching, i.e. 9915/// template <> template <class T> friend class A<int>::B; 9916Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9917 MultiTemplateParamsArg TempParams) { 9918 SourceLocation Loc = DS.getSourceRange().getBegin(); 9919 9920 assert(DS.isFriendSpecified()); 9921 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9922 9923 // Try to convert the decl specifier to a type. This works for 9924 // friend templates because ActOnTag never produces a ClassTemplateDecl 9925 // for a TUK_Friend. 9926 Declarator TheDeclarator(DS, Declarator::MemberContext); 9927 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9928 QualType T = TSI->getType(); 9929 if (TheDeclarator.isInvalidType()) 9930 return 0; 9931 9932 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9933 return 0; 9934 9935 // This is definitely an error in C++98. It's probably meant to 9936 // be forbidden in C++0x, too, but the specification is just 9937 // poorly written. 9938 // 9939 // The problem is with declarations like the following: 9940 // template <T> friend A<T>::foo; 9941 // where deciding whether a class C is a friend or not now hinges 9942 // on whether there exists an instantiation of A that causes 9943 // 'foo' to equal C. There are restrictions on class-heads 9944 // (which we declare (by fiat) elaborated friend declarations to 9945 // be) that makes this tractable. 9946 // 9947 // FIXME: handle "template <> friend class A<T>;", which 9948 // is possibly well-formed? Who even knows? 9949 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9950 Diag(Loc, diag::err_tagless_friend_type_template) 9951 << DS.getSourceRange(); 9952 return 0; 9953 } 9954 9955 // C++98 [class.friend]p1: A friend of a class is a function 9956 // or class that is not a member of the class . . . 9957 // This is fixed in DR77, which just barely didn't make the C++03 9958 // deadline. It's also a very silly restriction that seriously 9959 // affects inner classes and which nobody else seems to implement; 9960 // thus we never diagnose it, not even in -pedantic. 9961 // 9962 // But note that we could warn about it: it's always useless to 9963 // friend one of your own members (it's not, however, worthless to 9964 // friend a member of an arbitrary specialization of your template). 9965 9966 Decl *D; 9967 if (unsigned NumTempParamLists = TempParams.size()) 9968 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9969 NumTempParamLists, 9970 TempParams.release(), 9971 TSI, 9972 DS.getFriendSpecLoc()); 9973 else 9974 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 9975 9976 if (!D) 9977 return 0; 9978 9979 D->setAccess(AS_public); 9980 CurContext->addDecl(D); 9981 9982 return D; 9983} 9984 9985Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 9986 MultiTemplateParamsArg TemplateParams) { 9987 const DeclSpec &DS = D.getDeclSpec(); 9988 9989 assert(DS.isFriendSpecified()); 9990 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9991 9992 SourceLocation Loc = D.getIdentifierLoc(); 9993 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9994 9995 // C++ [class.friend]p1 9996 // A friend of a class is a function or class.... 9997 // Note that this sees through typedefs, which is intended. 9998 // It *doesn't* see through dependent types, which is correct 9999 // according to [temp.arg.type]p3: 10000 // If a declaration acquires a function type through a 10001 // type dependent on a template-parameter and this causes 10002 // a declaration that does not use the syntactic form of a 10003 // function declarator to have a function type, the program 10004 // is ill-formed. 10005 if (!TInfo->getType()->isFunctionType()) { 10006 Diag(Loc, diag::err_unexpected_friend); 10007 10008 // It might be worthwhile to try to recover by creating an 10009 // appropriate declaration. 10010 return 0; 10011 } 10012 10013 // C++ [namespace.memdef]p3 10014 // - If a friend declaration in a non-local class first declares a 10015 // class or function, the friend class or function is a member 10016 // of the innermost enclosing namespace. 10017 // - The name of the friend is not found by simple name lookup 10018 // until a matching declaration is provided in that namespace 10019 // scope (either before or after the class declaration granting 10020 // friendship). 10021 // - If a friend function is called, its name may be found by the 10022 // name lookup that considers functions from namespaces and 10023 // classes associated with the types of the function arguments. 10024 // - When looking for a prior declaration of a class or a function 10025 // declared as a friend, scopes outside the innermost enclosing 10026 // namespace scope are not considered. 10027 10028 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10029 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10030 DeclarationName Name = NameInfo.getName(); 10031 assert(Name); 10032 10033 // Check for unexpanded parameter packs. 10034 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10035 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10036 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10037 return 0; 10038 10039 // The context we found the declaration in, or in which we should 10040 // create the declaration. 10041 DeclContext *DC; 10042 Scope *DCScope = S; 10043 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10044 ForRedeclaration); 10045 10046 // FIXME: there are different rules in local classes 10047 10048 // There are four cases here. 10049 // - There's no scope specifier, in which case we just go to the 10050 // appropriate scope and look for a function or function template 10051 // there as appropriate. 10052 // Recover from invalid scope qualifiers as if they just weren't there. 10053 if (SS.isInvalid() || !SS.isSet()) { 10054 // C++0x [namespace.memdef]p3: 10055 // If the name in a friend declaration is neither qualified nor 10056 // a template-id and the declaration is a function or an 10057 // elaborated-type-specifier, the lookup to determine whether 10058 // the entity has been previously declared shall not consider 10059 // any scopes outside the innermost enclosing namespace. 10060 // C++0x [class.friend]p11: 10061 // If a friend declaration appears in a local class and the name 10062 // specified is an unqualified name, a prior declaration is 10063 // looked up without considering scopes that are outside the 10064 // innermost enclosing non-class scope. For a friend function 10065 // declaration, if there is no prior declaration, the program is 10066 // ill-formed. 10067 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10068 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10069 10070 // Find the appropriate context according to the above. 10071 DC = CurContext; 10072 while (true) { 10073 // Skip class contexts. If someone can cite chapter and verse 10074 // for this behavior, that would be nice --- it's what GCC and 10075 // EDG do, and it seems like a reasonable intent, but the spec 10076 // really only says that checks for unqualified existing 10077 // declarations should stop at the nearest enclosing namespace, 10078 // not that they should only consider the nearest enclosing 10079 // namespace. 10080 while (DC->isRecord()) 10081 DC = DC->getParent(); 10082 10083 LookupQualifiedName(Previous, DC); 10084 10085 // TODO: decide what we think about using declarations. 10086 if (isLocal || !Previous.empty()) 10087 break; 10088 10089 if (isTemplateId) { 10090 if (isa<TranslationUnitDecl>(DC)) break; 10091 } else { 10092 if (DC->isFileContext()) break; 10093 } 10094 DC = DC->getParent(); 10095 } 10096 10097 // C++ [class.friend]p1: A friend of a class is a function or 10098 // class that is not a member of the class . . . 10099 // C++11 changes this for both friend types and functions. 10100 // Most C++ 98 compilers do seem to give an error here, so 10101 // we do, too. 10102 if (!Previous.empty() && DC->Equals(CurContext)) 10103 Diag(DS.getFriendSpecLoc(), 10104 getLangOptions().CPlusPlus0x ? 10105 diag::warn_cxx98_compat_friend_is_member : 10106 diag::err_friend_is_member); 10107 10108 DCScope = getScopeForDeclContext(S, DC); 10109 10110 // C++ [class.friend]p6: 10111 // A function can be defined in a friend declaration of a class if and 10112 // only if the class is a non-local class (9.8), the function name is 10113 // unqualified, and the function has namespace scope. 10114 if (isLocal && D.isFunctionDefinition()) { 10115 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10116 } 10117 10118 // - There's a non-dependent scope specifier, in which case we 10119 // compute it and do a previous lookup there for a function 10120 // or function template. 10121 } else if (!SS.getScopeRep()->isDependent()) { 10122 DC = computeDeclContext(SS); 10123 if (!DC) return 0; 10124 10125 if (RequireCompleteDeclContext(SS, DC)) return 0; 10126 10127 LookupQualifiedName(Previous, DC); 10128 10129 // Ignore things found implicitly in the wrong scope. 10130 // TODO: better diagnostics for this case. Suggesting the right 10131 // qualified scope would be nice... 10132 LookupResult::Filter F = Previous.makeFilter(); 10133 while (F.hasNext()) { 10134 NamedDecl *D = F.next(); 10135 if (!DC->InEnclosingNamespaceSetOf( 10136 D->getDeclContext()->getRedeclContext())) 10137 F.erase(); 10138 } 10139 F.done(); 10140 10141 if (Previous.empty()) { 10142 D.setInvalidType(); 10143 Diag(Loc, diag::err_qualified_friend_not_found) 10144 << Name << TInfo->getType(); 10145 return 0; 10146 } 10147 10148 // C++ [class.friend]p1: A friend of a class is a function or 10149 // class that is not a member of the class . . . 10150 if (DC->Equals(CurContext)) 10151 Diag(DS.getFriendSpecLoc(), 10152 getLangOptions().CPlusPlus0x ? 10153 diag::warn_cxx98_compat_friend_is_member : 10154 diag::err_friend_is_member); 10155 10156 if (D.isFunctionDefinition()) { 10157 // C++ [class.friend]p6: 10158 // A function can be defined in a friend declaration of a class if and 10159 // only if the class is a non-local class (9.8), the function name is 10160 // unqualified, and the function has namespace scope. 10161 SemaDiagnosticBuilder DB 10162 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10163 10164 DB << SS.getScopeRep(); 10165 if (DC->isFileContext()) 10166 DB << FixItHint::CreateRemoval(SS.getRange()); 10167 SS.clear(); 10168 } 10169 10170 // - There's a scope specifier that does not match any template 10171 // parameter lists, in which case we use some arbitrary context, 10172 // create a method or method template, and wait for instantiation. 10173 // - There's a scope specifier that does match some template 10174 // parameter lists, which we don't handle right now. 10175 } else { 10176 if (D.isFunctionDefinition()) { 10177 // C++ [class.friend]p6: 10178 // A function can be defined in a friend declaration of a class if and 10179 // only if the class is a non-local class (9.8), the function name is 10180 // unqualified, and the function has namespace scope. 10181 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10182 << SS.getScopeRep(); 10183 } 10184 10185 DC = CurContext; 10186 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10187 } 10188 10189 if (!DC->isRecord()) { 10190 // This implies that it has to be an operator or function. 10191 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10192 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10193 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10194 Diag(Loc, diag::err_introducing_special_friend) << 10195 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10196 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10197 return 0; 10198 } 10199 } 10200 10201 // FIXME: This is an egregious hack to cope with cases where the scope stack 10202 // does not contain the declaration context, i.e., in an out-of-line 10203 // definition of a class. 10204 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10205 if (!DCScope) { 10206 FakeDCScope.setEntity(DC); 10207 DCScope = &FakeDCScope; 10208 } 10209 10210 bool AddToScope = true; 10211 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10212 move(TemplateParams), AddToScope); 10213 if (!ND) return 0; 10214 10215 assert(ND->getDeclContext() == DC); 10216 assert(ND->getLexicalDeclContext() == CurContext); 10217 10218 // Add the function declaration to the appropriate lookup tables, 10219 // adjusting the redeclarations list as necessary. We don't 10220 // want to do this yet if the friending class is dependent. 10221 // 10222 // Also update the scope-based lookup if the target context's 10223 // lookup context is in lexical scope. 10224 if (!CurContext->isDependentContext()) { 10225 DC = DC->getRedeclContext(); 10226 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10227 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10228 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10229 } 10230 10231 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10232 D.getIdentifierLoc(), ND, 10233 DS.getFriendSpecLoc()); 10234 FrD->setAccess(AS_public); 10235 CurContext->addDecl(FrD); 10236 10237 if (ND->isInvalidDecl()) 10238 FrD->setInvalidDecl(); 10239 else { 10240 FunctionDecl *FD; 10241 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10242 FD = FTD->getTemplatedDecl(); 10243 else 10244 FD = cast<FunctionDecl>(ND); 10245 10246 // Mark templated-scope function declarations as unsupported. 10247 if (FD->getNumTemplateParameterLists()) 10248 FrD->setUnsupportedFriend(true); 10249 } 10250 10251 return ND; 10252} 10253 10254void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10255 AdjustDeclIfTemplate(Dcl); 10256 10257 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10258 if (!Fn) { 10259 Diag(DelLoc, diag::err_deleted_non_function); 10260 return; 10261 } 10262 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10263 Diag(DelLoc, diag::err_deleted_decl_not_first); 10264 Diag(Prev->getLocation(), diag::note_previous_declaration); 10265 // If the declaration wasn't the first, we delete the function anyway for 10266 // recovery. 10267 } 10268 Fn->setDeletedAsWritten(); 10269 10270 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10271 if (!MD) 10272 return; 10273 10274 // A deleted special member function is trivial if the corresponding 10275 // implicitly-declared function would have been. 10276 switch (getSpecialMember(MD)) { 10277 case CXXInvalid: 10278 break; 10279 case CXXDefaultConstructor: 10280 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10281 break; 10282 case CXXCopyConstructor: 10283 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10284 break; 10285 case CXXMoveConstructor: 10286 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10287 break; 10288 case CXXCopyAssignment: 10289 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10290 break; 10291 case CXXMoveAssignment: 10292 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10293 break; 10294 case CXXDestructor: 10295 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10296 break; 10297 } 10298} 10299 10300void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10301 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10302 10303 if (MD) { 10304 if (MD->getParent()->isDependentType()) { 10305 MD->setDefaulted(); 10306 MD->setExplicitlyDefaulted(); 10307 return; 10308 } 10309 10310 CXXSpecialMember Member = getSpecialMember(MD); 10311 if (Member == CXXInvalid) { 10312 Diag(DefaultLoc, diag::err_default_special_members); 10313 return; 10314 } 10315 10316 MD->setDefaulted(); 10317 MD->setExplicitlyDefaulted(); 10318 10319 // If this definition appears within the record, do the checking when 10320 // the record is complete. 10321 const FunctionDecl *Primary = MD; 10322 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10323 // Find the uninstantiated declaration that actually had the '= default' 10324 // on it. 10325 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10326 10327 if (Primary == Primary->getCanonicalDecl()) 10328 return; 10329 10330 switch (Member) { 10331 case CXXDefaultConstructor: { 10332 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10333 CheckExplicitlyDefaultedDefaultConstructor(CD); 10334 if (!CD->isInvalidDecl()) 10335 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10336 break; 10337 } 10338 10339 case CXXCopyConstructor: { 10340 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10341 CheckExplicitlyDefaultedCopyConstructor(CD); 10342 if (!CD->isInvalidDecl()) 10343 DefineImplicitCopyConstructor(DefaultLoc, CD); 10344 break; 10345 } 10346 10347 case CXXCopyAssignment: { 10348 CheckExplicitlyDefaultedCopyAssignment(MD); 10349 if (!MD->isInvalidDecl()) 10350 DefineImplicitCopyAssignment(DefaultLoc, MD); 10351 break; 10352 } 10353 10354 case CXXDestructor: { 10355 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10356 CheckExplicitlyDefaultedDestructor(DD); 10357 if (!DD->isInvalidDecl()) 10358 DefineImplicitDestructor(DefaultLoc, DD); 10359 break; 10360 } 10361 10362 case CXXMoveConstructor: { 10363 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10364 CheckExplicitlyDefaultedMoveConstructor(CD); 10365 if (!CD->isInvalidDecl()) 10366 DefineImplicitMoveConstructor(DefaultLoc, CD); 10367 break; 10368 } 10369 10370 case CXXMoveAssignment: { 10371 CheckExplicitlyDefaultedMoveAssignment(MD); 10372 if (!MD->isInvalidDecl()) 10373 DefineImplicitMoveAssignment(DefaultLoc, MD); 10374 break; 10375 } 10376 10377 case CXXInvalid: 10378 llvm_unreachable("Invalid special member."); 10379 } 10380 } else { 10381 Diag(DefaultLoc, diag::err_default_special_members); 10382 } 10383} 10384 10385static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10386 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10387 Stmt *SubStmt = *CI; 10388 if (!SubStmt) 10389 continue; 10390 if (isa<ReturnStmt>(SubStmt)) 10391 Self.Diag(SubStmt->getSourceRange().getBegin(), 10392 diag::err_return_in_constructor_handler); 10393 if (!isa<Expr>(SubStmt)) 10394 SearchForReturnInStmt(Self, SubStmt); 10395 } 10396} 10397 10398void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10399 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10400 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10401 SearchForReturnInStmt(*this, Handler); 10402 } 10403} 10404 10405bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10406 const CXXMethodDecl *Old) { 10407 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10408 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10409 10410 if (Context.hasSameType(NewTy, OldTy) || 10411 NewTy->isDependentType() || OldTy->isDependentType()) 10412 return false; 10413 10414 // Check if the return types are covariant 10415 QualType NewClassTy, OldClassTy; 10416 10417 /// Both types must be pointers or references to classes. 10418 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10419 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10420 NewClassTy = NewPT->getPointeeType(); 10421 OldClassTy = OldPT->getPointeeType(); 10422 } 10423 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10424 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10425 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10426 NewClassTy = NewRT->getPointeeType(); 10427 OldClassTy = OldRT->getPointeeType(); 10428 } 10429 } 10430 } 10431 10432 // The return types aren't either both pointers or references to a class type. 10433 if (NewClassTy.isNull()) { 10434 Diag(New->getLocation(), 10435 diag::err_different_return_type_for_overriding_virtual_function) 10436 << New->getDeclName() << NewTy << OldTy; 10437 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10438 10439 return true; 10440 } 10441 10442 // C++ [class.virtual]p6: 10443 // If the return type of D::f differs from the return type of B::f, the 10444 // class type in the return type of D::f shall be complete at the point of 10445 // declaration of D::f or shall be the class type D. 10446 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10447 if (!RT->isBeingDefined() && 10448 RequireCompleteType(New->getLocation(), NewClassTy, 10449 PDiag(diag::err_covariant_return_incomplete) 10450 << New->getDeclName())) 10451 return true; 10452 } 10453 10454 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10455 // Check if the new class derives from the old class. 10456 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10457 Diag(New->getLocation(), 10458 diag::err_covariant_return_not_derived) 10459 << New->getDeclName() << NewTy << OldTy; 10460 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10461 return true; 10462 } 10463 10464 // Check if we the conversion from derived to base is valid. 10465 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10466 diag::err_covariant_return_inaccessible_base, 10467 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10468 // FIXME: Should this point to the return type? 10469 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10470 // FIXME: this note won't trigger for delayed access control 10471 // diagnostics, and it's impossible to get an undelayed error 10472 // here from access control during the original parse because 10473 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10474 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10475 return true; 10476 } 10477 } 10478 10479 // The qualifiers of the return types must be the same. 10480 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10481 Diag(New->getLocation(), 10482 diag::err_covariant_return_type_different_qualifications) 10483 << New->getDeclName() << NewTy << OldTy; 10484 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10485 return true; 10486 }; 10487 10488 10489 // The new class type must have the same or less qualifiers as the old type. 10490 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10491 Diag(New->getLocation(), 10492 diag::err_covariant_return_type_class_type_more_qualified) 10493 << New->getDeclName() << NewTy << OldTy; 10494 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10495 return true; 10496 }; 10497 10498 return false; 10499} 10500 10501/// \brief Mark the given method pure. 10502/// 10503/// \param Method the method to be marked pure. 10504/// 10505/// \param InitRange the source range that covers the "0" initializer. 10506bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10507 SourceLocation EndLoc = InitRange.getEnd(); 10508 if (EndLoc.isValid()) 10509 Method->setRangeEnd(EndLoc); 10510 10511 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10512 Method->setPure(); 10513 return false; 10514 } 10515 10516 if (!Method->isInvalidDecl()) 10517 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10518 << Method->getDeclName() << InitRange; 10519 return true; 10520} 10521 10522/// \brief Determine whether the given declaration is a static data member. 10523static bool isStaticDataMember(Decl *D) { 10524 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10525 if (!Var) 10526 return false; 10527 10528 return Var->isStaticDataMember(); 10529} 10530/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10531/// an initializer for the out-of-line declaration 'Dcl'. The scope 10532/// is a fresh scope pushed for just this purpose. 10533/// 10534/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10535/// static data member of class X, names should be looked up in the scope of 10536/// class X. 10537void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10538 // If there is no declaration, there was an error parsing it. 10539 if (D == 0 || D->isInvalidDecl()) return; 10540 10541 // We should only get called for declarations with scope specifiers, like: 10542 // int foo::bar; 10543 assert(D->isOutOfLine()); 10544 EnterDeclaratorContext(S, D->getDeclContext()); 10545 10546 // If we are parsing the initializer for a static data member, push a 10547 // new expression evaluation context that is associated with this static 10548 // data member. 10549 if (isStaticDataMember(D)) 10550 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10551} 10552 10553/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10554/// initializer for the out-of-line declaration 'D'. 10555void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10556 // If there is no declaration, there was an error parsing it. 10557 if (D == 0 || D->isInvalidDecl()) return; 10558 10559 if (isStaticDataMember(D)) 10560 PopExpressionEvaluationContext(); 10561 10562 assert(D->isOutOfLine()); 10563 ExitDeclaratorContext(S); 10564} 10565 10566/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10567/// C++ if/switch/while/for statement. 10568/// e.g: "if (int x = f()) {...}" 10569DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10570 // C++ 6.4p2: 10571 // The declarator shall not specify a function or an array. 10572 // The type-specifier-seq shall not contain typedef and shall not declare a 10573 // new class or enumeration. 10574 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10575 "Parser allowed 'typedef' as storage class of condition decl."); 10576 10577 Decl *Dcl = ActOnDeclarator(S, D); 10578 if (!Dcl) 10579 return true; 10580 10581 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10582 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10583 << D.getSourceRange(); 10584 return true; 10585 } 10586 10587 return Dcl; 10588} 10589 10590void Sema::LoadExternalVTableUses() { 10591 if (!ExternalSource) 10592 return; 10593 10594 SmallVector<ExternalVTableUse, 4> VTables; 10595 ExternalSource->ReadUsedVTables(VTables); 10596 SmallVector<VTableUse, 4> NewUses; 10597 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10598 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10599 = VTablesUsed.find(VTables[I].Record); 10600 // Even if a definition wasn't required before, it may be required now. 10601 if (Pos != VTablesUsed.end()) { 10602 if (!Pos->second && VTables[I].DefinitionRequired) 10603 Pos->second = true; 10604 continue; 10605 } 10606 10607 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10608 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10609 } 10610 10611 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10612} 10613 10614void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10615 bool DefinitionRequired) { 10616 // Ignore any vtable uses in unevaluated operands or for classes that do 10617 // not have a vtable. 10618 if (!Class->isDynamicClass() || Class->isDependentContext() || 10619 CurContext->isDependentContext() || 10620 ExprEvalContexts.back().Context == Unevaluated) 10621 return; 10622 10623 // Try to insert this class into the map. 10624 LoadExternalVTableUses(); 10625 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10626 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10627 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10628 if (!Pos.second) { 10629 // If we already had an entry, check to see if we are promoting this vtable 10630 // to required a definition. If so, we need to reappend to the VTableUses 10631 // list, since we may have already processed the first entry. 10632 if (DefinitionRequired && !Pos.first->second) { 10633 Pos.first->second = true; 10634 } else { 10635 // Otherwise, we can early exit. 10636 return; 10637 } 10638 } 10639 10640 // Local classes need to have their virtual members marked 10641 // immediately. For all other classes, we mark their virtual members 10642 // at the end of the translation unit. 10643 if (Class->isLocalClass()) 10644 MarkVirtualMembersReferenced(Loc, Class); 10645 else 10646 VTableUses.push_back(std::make_pair(Class, Loc)); 10647} 10648 10649bool Sema::DefineUsedVTables() { 10650 LoadExternalVTableUses(); 10651 if (VTableUses.empty()) 10652 return false; 10653 10654 // Note: The VTableUses vector could grow as a result of marking 10655 // the members of a class as "used", so we check the size each 10656 // time through the loop and prefer indices (with are stable) to 10657 // iterators (which are not). 10658 bool DefinedAnything = false; 10659 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10660 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10661 if (!Class) 10662 continue; 10663 10664 SourceLocation Loc = VTableUses[I].second; 10665 10666 // If this class has a key function, but that key function is 10667 // defined in another translation unit, we don't need to emit the 10668 // vtable even though we're using it. 10669 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10670 if (KeyFunction && !KeyFunction->hasBody()) { 10671 switch (KeyFunction->getTemplateSpecializationKind()) { 10672 case TSK_Undeclared: 10673 case TSK_ExplicitSpecialization: 10674 case TSK_ExplicitInstantiationDeclaration: 10675 // The key function is in another translation unit. 10676 continue; 10677 10678 case TSK_ExplicitInstantiationDefinition: 10679 case TSK_ImplicitInstantiation: 10680 // We will be instantiating the key function. 10681 break; 10682 } 10683 } else if (!KeyFunction) { 10684 // If we have a class with no key function that is the subject 10685 // of an explicit instantiation declaration, suppress the 10686 // vtable; it will live with the explicit instantiation 10687 // definition. 10688 bool IsExplicitInstantiationDeclaration 10689 = Class->getTemplateSpecializationKind() 10690 == TSK_ExplicitInstantiationDeclaration; 10691 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10692 REnd = Class->redecls_end(); 10693 R != REnd; ++R) { 10694 TemplateSpecializationKind TSK 10695 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10696 if (TSK == TSK_ExplicitInstantiationDeclaration) 10697 IsExplicitInstantiationDeclaration = true; 10698 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10699 IsExplicitInstantiationDeclaration = false; 10700 break; 10701 } 10702 } 10703 10704 if (IsExplicitInstantiationDeclaration) 10705 continue; 10706 } 10707 10708 // Mark all of the virtual members of this class as referenced, so 10709 // that we can build a vtable. Then, tell the AST consumer that a 10710 // vtable for this class is required. 10711 DefinedAnything = true; 10712 MarkVirtualMembersReferenced(Loc, Class); 10713 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10714 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10715 10716 // Optionally warn if we're emitting a weak vtable. 10717 if (Class->getLinkage() == ExternalLinkage && 10718 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10719 const FunctionDecl *KeyFunctionDef = 0; 10720 if (!KeyFunction || 10721 (KeyFunction->hasBody(KeyFunctionDef) && 10722 KeyFunctionDef->isInlined())) 10723 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10724 TSK_ExplicitInstantiationDefinition 10725 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10726 << Class; 10727 } 10728 } 10729 VTableUses.clear(); 10730 10731 return DefinedAnything; 10732} 10733 10734void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10735 const CXXRecordDecl *RD) { 10736 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10737 e = RD->method_end(); i != e; ++i) { 10738 CXXMethodDecl *MD = *i; 10739 10740 // C++ [basic.def.odr]p2: 10741 // [...] A virtual member function is used if it is not pure. [...] 10742 if (MD->isVirtual() && !MD->isPure()) 10743 MarkFunctionReferenced(Loc, MD); 10744 } 10745 10746 // Only classes that have virtual bases need a VTT. 10747 if (RD->getNumVBases() == 0) 10748 return; 10749 10750 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10751 e = RD->bases_end(); i != e; ++i) { 10752 const CXXRecordDecl *Base = 10753 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10754 if (Base->getNumVBases() == 0) 10755 continue; 10756 MarkVirtualMembersReferenced(Loc, Base); 10757 } 10758} 10759 10760/// SetIvarInitializers - This routine builds initialization ASTs for the 10761/// Objective-C implementation whose ivars need be initialized. 10762void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10763 if (!getLangOptions().CPlusPlus) 10764 return; 10765 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10766 SmallVector<ObjCIvarDecl*, 8> ivars; 10767 CollectIvarsToConstructOrDestruct(OID, ivars); 10768 if (ivars.empty()) 10769 return; 10770 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10771 for (unsigned i = 0; i < ivars.size(); i++) { 10772 FieldDecl *Field = ivars[i]; 10773 if (Field->isInvalidDecl()) 10774 continue; 10775 10776 CXXCtorInitializer *Member; 10777 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10778 InitializationKind InitKind = 10779 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10780 10781 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10782 ExprResult MemberInit = 10783 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10784 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10785 // Note, MemberInit could actually come back empty if no initialization 10786 // is required (e.g., because it would call a trivial default constructor) 10787 if (!MemberInit.get() || MemberInit.isInvalid()) 10788 continue; 10789 10790 Member = 10791 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10792 SourceLocation(), 10793 MemberInit.takeAs<Expr>(), 10794 SourceLocation()); 10795 AllToInit.push_back(Member); 10796 10797 // Be sure that the destructor is accessible and is marked as referenced. 10798 if (const RecordType *RecordTy 10799 = Context.getBaseElementType(Field->getType()) 10800 ->getAs<RecordType>()) { 10801 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10802 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10803 MarkFunctionReferenced(Field->getLocation(), Destructor); 10804 CheckDestructorAccess(Field->getLocation(), Destructor, 10805 PDiag(diag::err_access_dtor_ivar) 10806 << Context.getBaseElementType(Field->getType())); 10807 } 10808 } 10809 } 10810 ObjCImplementation->setIvarInitializers(Context, 10811 AllToInit.data(), AllToInit.size()); 10812 } 10813} 10814 10815static 10816void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10817 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10818 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10819 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10820 Sema &S) { 10821 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10822 CE = Current.end(); 10823 if (Ctor->isInvalidDecl()) 10824 return; 10825 10826 const FunctionDecl *FNTarget = 0; 10827 CXXConstructorDecl *Target; 10828 10829 // We ignore the result here since if we don't have a body, Target will be 10830 // null below. 10831 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10832 Target 10833= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10834 10835 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10836 // Avoid dereferencing a null pointer here. 10837 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10838 10839 if (!Current.insert(Canonical)) 10840 return; 10841 10842 // We know that beyond here, we aren't chaining into a cycle. 10843 if (!Target || !Target->isDelegatingConstructor() || 10844 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10845 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10846 Valid.insert(*CI); 10847 Current.clear(); 10848 // We've hit a cycle. 10849 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10850 Current.count(TCanonical)) { 10851 // If we haven't diagnosed this cycle yet, do so now. 10852 if (!Invalid.count(TCanonical)) { 10853 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10854 diag::warn_delegating_ctor_cycle) 10855 << Ctor; 10856 10857 // Don't add a note for a function delegating directo to itself. 10858 if (TCanonical != Canonical) 10859 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10860 10861 CXXConstructorDecl *C = Target; 10862 while (C->getCanonicalDecl() != Canonical) { 10863 (void)C->getTargetConstructor()->hasBody(FNTarget); 10864 assert(FNTarget && "Ctor cycle through bodiless function"); 10865 10866 C 10867 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10868 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10869 } 10870 } 10871 10872 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10873 Invalid.insert(*CI); 10874 Current.clear(); 10875 } else { 10876 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10877 } 10878} 10879 10880 10881void Sema::CheckDelegatingCtorCycles() { 10882 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10883 10884 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10885 CE = Current.end(); 10886 10887 for (DelegatingCtorDeclsType::iterator 10888 I = DelegatingCtorDecls.begin(ExternalSource), 10889 E = DelegatingCtorDecls.end(); 10890 I != E; ++I) { 10891 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10892 } 10893 10894 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10895 (*CI)->setInvalidDecl(); 10896} 10897 10898/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10899Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10900 // Implicitly declared functions (e.g. copy constructors) are 10901 // __host__ __device__ 10902 if (D->isImplicit()) 10903 return CFT_HostDevice; 10904 10905 if (D->hasAttr<CUDAGlobalAttr>()) 10906 return CFT_Global; 10907 10908 if (D->hasAttr<CUDADeviceAttr>()) { 10909 if (D->hasAttr<CUDAHostAttr>()) 10910 return CFT_HostDevice; 10911 else 10912 return CFT_Device; 10913 } 10914 10915 return CFT_Host; 10916} 10917 10918bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10919 CUDAFunctionTarget CalleeTarget) { 10920 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10921 // Callable from the device only." 10922 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10923 return true; 10924 10925 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10926 // Callable from the host only." 10927 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10928 // Callable from the host only." 10929 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10930 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 10931 return true; 10932 10933 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 10934 return true; 10935 10936 return false; 10937} 10938