SemaDeclCXX.cpp revision 7d5088aa52d6e32b309ad0af32ea520ddbc5f953
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/DenseSet.h" 36#include "llvm/ADT/SmallString.h" 37#include "llvm/ADT/STLExtras.h" 38#include <map> 39#include <set> 40 41using namespace clang; 42 43//===----------------------------------------------------------------------===// 44// CheckDefaultArgumentVisitor 45//===----------------------------------------------------------------------===// 46 47namespace { 48 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 49 /// the default argument of a parameter to determine whether it 50 /// contains any ill-formed subexpressions. For example, this will 51 /// diagnose the use of local variables or parameters within the 52 /// default argument expression. 53 class CheckDefaultArgumentVisitor 54 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 55 Expr *DefaultArg; 56 Sema *S; 57 58 public: 59 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 60 : DefaultArg(defarg), S(s) {} 61 62 bool VisitExpr(Expr *Node); 63 bool VisitDeclRefExpr(DeclRefExpr *DRE); 64 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 65 bool VisitLambdaExpr(LambdaExpr *Lambda); 66 }; 67 68 /// VisitExpr - Visit all of the children of this expression. 69 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 70 bool IsInvalid = false; 71 for (Stmt::child_range I = Node->children(); I; ++I) 72 IsInvalid |= Visit(*I); 73 return IsInvalid; 74 } 75 76 /// VisitDeclRefExpr - Visit a reference to a declaration, to 77 /// determine whether this declaration can be used in the default 78 /// argument expression. 79 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 80 NamedDecl *Decl = DRE->getDecl(); 81 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 82 // C++ [dcl.fct.default]p9 83 // Default arguments are evaluated each time the function is 84 // called. The order of evaluation of function arguments is 85 // unspecified. Consequently, parameters of a function shall not 86 // be used in default argument expressions, even if they are not 87 // evaluated. Parameters of a function declared before a default 88 // argument expression are in scope and can hide namespace and 89 // class member names. 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_param) 92 << Param->getDeclName() << DefaultArg->getSourceRange(); 93 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 94 // C++ [dcl.fct.default]p7 95 // Local variables shall not be used in default argument 96 // expressions. 97 if (VDecl->isLocalVarDecl()) 98 return S->Diag(DRE->getSourceRange().getBegin(), 99 diag::err_param_default_argument_references_local) 100 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 101 } 102 103 return false; 104 } 105 106 /// VisitCXXThisExpr - Visit a C++ "this" expression. 107 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 108 // C++ [dcl.fct.default]p8: 109 // The keyword this shall not be used in a default argument of a 110 // member function. 111 return S->Diag(ThisE->getSourceRange().getBegin(), 112 diag::err_param_default_argument_references_this) 113 << ThisE->getSourceRange(); 114 } 115 116 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 117 // C++11 [expr.lambda.prim]p13: 118 // A lambda-expression appearing in a default argument shall not 119 // implicitly or explicitly capture any entity. 120 if (Lambda->capture_begin() == Lambda->capture_end()) 121 return false; 122 123 return S->Diag(Lambda->getLocStart(), 124 diag::err_lambda_capture_default_arg); 125 } 126} 127 128void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 129 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 130 // If we have an MSAny or unknown spec already, don't bother. 131 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 132 return; 133 134 const FunctionProtoType *Proto 135 = Method->getType()->getAs<FunctionProtoType>(); 136 137 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 138 139 // If this function can throw any exceptions, make a note of that. 140 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 141 ClearExceptions(); 142 ComputedEST = EST; 143 return; 144 } 145 146 // FIXME: If the call to this decl is using any of its default arguments, we 147 // need to search them for potentially-throwing calls. 148 149 // If this function has a basic noexcept, it doesn't affect the outcome. 150 if (EST == EST_BasicNoexcept) 151 return; 152 153 // If we have a throw-all spec at this point, ignore the function. 154 if (ComputedEST == EST_None) 155 return; 156 157 // If we're still at noexcept(true) and there's a nothrow() callee, 158 // change to that specification. 159 if (EST == EST_DynamicNone) { 160 if (ComputedEST == EST_BasicNoexcept) 161 ComputedEST = EST_DynamicNone; 162 return; 163 } 164 165 // Check out noexcept specs. 166 if (EST == EST_ComputedNoexcept) { 167 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 168 assert(NR != FunctionProtoType::NR_NoNoexcept && 169 "Must have noexcept result for EST_ComputedNoexcept."); 170 assert(NR != FunctionProtoType::NR_Dependent && 171 "Should not generate implicit declarations for dependent cases, " 172 "and don't know how to handle them anyway."); 173 174 // noexcept(false) -> no spec on the new function 175 if (NR == FunctionProtoType::NR_Throw) { 176 ClearExceptions(); 177 ComputedEST = EST_None; 178 } 179 // noexcept(true) won't change anything either. 180 return; 181 } 182 183 assert(EST == EST_Dynamic && "EST case not considered earlier."); 184 assert(ComputedEST != EST_None && 185 "Shouldn't collect exceptions when throw-all is guaranteed."); 186 ComputedEST = EST_Dynamic; 187 // Record the exceptions in this function's exception specification. 188 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 189 EEnd = Proto->exception_end(); 190 E != EEnd; ++E) 191 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 192 Exceptions.push_back(*E); 193} 194 195void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 196 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 197 return; 198 199 // FIXME: 200 // 201 // C++0x [except.spec]p14: 202 // [An] implicit exception-specification specifies the type-id T if and 203 // only if T is allowed by the exception-specification of a function directly 204 // invoked by f's implicit definition; f shall allow all exceptions if any 205 // function it directly invokes allows all exceptions, and f shall allow no 206 // exceptions if every function it directly invokes allows no exceptions. 207 // 208 // Note in particular that if an implicit exception-specification is generated 209 // for a function containing a throw-expression, that specification can still 210 // be noexcept(true). 211 // 212 // Note also that 'directly invoked' is not defined in the standard, and there 213 // is no indication that we should only consider potentially-evaluated calls. 214 // 215 // Ultimately we should implement the intent of the standard: the exception 216 // specification should be the set of exceptions which can be thrown by the 217 // implicit definition. For now, we assume that any non-nothrow expression can 218 // throw any exception. 219 220 if (E->CanThrow(*Context)) 221 ComputedEST = EST_None; 222} 223 224bool 225Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 226 SourceLocation EqualLoc) { 227 if (RequireCompleteType(Param->getLocation(), Param->getType(), 228 diag::err_typecheck_decl_incomplete_type)) { 229 Param->setInvalidDecl(); 230 return true; 231 } 232 233 // C++ [dcl.fct.default]p5 234 // A default argument expression is implicitly converted (clause 235 // 4) to the parameter type. The default argument expression has 236 // the same semantic constraints as the initializer expression in 237 // a declaration of a variable of the parameter type, using the 238 // copy-initialization semantics (8.5). 239 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 240 Param); 241 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 242 EqualLoc); 243 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 244 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 245 MultiExprArg(*this, &Arg, 1)); 246 if (Result.isInvalid()) 247 return true; 248 Arg = Result.takeAs<Expr>(); 249 250 CheckImplicitConversions(Arg, EqualLoc); 251 Arg = MaybeCreateExprWithCleanups(Arg); 252 253 // Okay: add the default argument to the parameter 254 Param->setDefaultArg(Arg); 255 256 // We have already instantiated this parameter; provide each of the 257 // instantiations with the uninstantiated default argument. 258 UnparsedDefaultArgInstantiationsMap::iterator InstPos 259 = UnparsedDefaultArgInstantiations.find(Param); 260 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 261 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 262 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 263 264 // We're done tracking this parameter's instantiations. 265 UnparsedDefaultArgInstantiations.erase(InstPos); 266 } 267 268 return false; 269} 270 271/// ActOnParamDefaultArgument - Check whether the default argument 272/// provided for a function parameter is well-formed. If so, attach it 273/// to the parameter declaration. 274void 275Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 276 Expr *DefaultArg) { 277 if (!param || !DefaultArg) 278 return; 279 280 ParmVarDecl *Param = cast<ParmVarDecl>(param); 281 UnparsedDefaultArgLocs.erase(Param); 282 283 // Default arguments are only permitted in C++ 284 if (!getLangOptions().CPlusPlus) { 285 Diag(EqualLoc, diag::err_param_default_argument) 286 << DefaultArg->getSourceRange(); 287 Param->setInvalidDecl(); 288 return; 289 } 290 291 // Check for unexpanded parameter packs. 292 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 293 Param->setInvalidDecl(); 294 return; 295 } 296 297 // Check that the default argument is well-formed 298 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 299 if (DefaultArgChecker.Visit(DefaultArg)) { 300 Param->setInvalidDecl(); 301 return; 302 } 303 304 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 305} 306 307/// ActOnParamUnparsedDefaultArgument - We've seen a default 308/// argument for a function parameter, but we can't parse it yet 309/// because we're inside a class definition. Note that this default 310/// argument will be parsed later. 311void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 312 SourceLocation EqualLoc, 313 SourceLocation ArgLoc) { 314 if (!param) 315 return; 316 317 ParmVarDecl *Param = cast<ParmVarDecl>(param); 318 if (Param) 319 Param->setUnparsedDefaultArg(); 320 321 UnparsedDefaultArgLocs[Param] = ArgLoc; 322} 323 324/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 325/// the default argument for the parameter param failed. 326void Sema::ActOnParamDefaultArgumentError(Decl *param) { 327 if (!param) 328 return; 329 330 ParmVarDecl *Param = cast<ParmVarDecl>(param); 331 332 Param->setInvalidDecl(); 333 334 UnparsedDefaultArgLocs.erase(Param); 335} 336 337/// CheckExtraCXXDefaultArguments - Check for any extra default 338/// arguments in the declarator, which is not a function declaration 339/// or definition and therefore is not permitted to have default 340/// arguments. This routine should be invoked for every declarator 341/// that is not a function declaration or definition. 342void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 343 // C++ [dcl.fct.default]p3 344 // A default argument expression shall be specified only in the 345 // parameter-declaration-clause of a function declaration or in a 346 // template-parameter (14.1). It shall not be specified for a 347 // parameter pack. If it is specified in a 348 // parameter-declaration-clause, it shall not occur within a 349 // declarator or abstract-declarator of a parameter-declaration. 350 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 351 DeclaratorChunk &chunk = D.getTypeObject(i); 352 if (chunk.Kind == DeclaratorChunk::Function) { 353 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 354 ParmVarDecl *Param = 355 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 356 if (Param->hasUnparsedDefaultArg()) { 357 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 358 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 359 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 360 delete Toks; 361 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 362 } else if (Param->getDefaultArg()) { 363 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 364 << Param->getDefaultArg()->getSourceRange(); 365 Param->setDefaultArg(0); 366 } 367 } 368 } 369 } 370} 371 372// MergeCXXFunctionDecl - Merge two declarations of the same C++ 373// function, once we already know that they have the same 374// type. Subroutine of MergeFunctionDecl. Returns true if there was an 375// error, false otherwise. 376bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 377 bool Invalid = false; 378 379 // C++ [dcl.fct.default]p4: 380 // For non-template functions, default arguments can be added in 381 // later declarations of a function in the same 382 // scope. Declarations in different scopes have completely 383 // distinct sets of default arguments. That is, declarations in 384 // inner scopes do not acquire default arguments from 385 // declarations in outer scopes, and vice versa. In a given 386 // function declaration, all parameters subsequent to a 387 // parameter with a default argument shall have default 388 // arguments supplied in this or previous declarations. A 389 // default argument shall not be redefined by a later 390 // declaration (not even to the same value). 391 // 392 // C++ [dcl.fct.default]p6: 393 // Except for member functions of class templates, the default arguments 394 // in a member function definition that appears outside of the class 395 // definition are added to the set of default arguments provided by the 396 // member function declaration in the class definition. 397 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 398 ParmVarDecl *OldParam = Old->getParamDecl(p); 399 ParmVarDecl *NewParam = New->getParamDecl(p); 400 401 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 402 403 unsigned DiagDefaultParamID = 404 diag::err_param_default_argument_redefinition; 405 406 // MSVC accepts that default parameters be redefined for member functions 407 // of template class. The new default parameter's value is ignored. 408 Invalid = true; 409 if (getLangOptions().MicrosoftExt) { 410 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 411 if (MD && MD->getParent()->getDescribedClassTemplate()) { 412 // Merge the old default argument into the new parameter. 413 NewParam->setHasInheritedDefaultArg(); 414 if (OldParam->hasUninstantiatedDefaultArg()) 415 NewParam->setUninstantiatedDefaultArg( 416 OldParam->getUninstantiatedDefaultArg()); 417 else 418 NewParam->setDefaultArg(OldParam->getInit()); 419 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 420 Invalid = false; 421 } 422 } 423 424 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 425 // hint here. Alternatively, we could walk the type-source information 426 // for NewParam to find the last source location in the type... but it 427 // isn't worth the effort right now. This is the kind of test case that 428 // is hard to get right: 429 // int f(int); 430 // void g(int (*fp)(int) = f); 431 // void g(int (*fp)(int) = &f); 432 Diag(NewParam->getLocation(), DiagDefaultParamID) 433 << NewParam->getDefaultArgRange(); 434 435 // Look for the function declaration where the default argument was 436 // actually written, which may be a declaration prior to Old. 437 for (FunctionDecl *Older = Old->getPreviousDecl(); 438 Older; Older = Older->getPreviousDecl()) { 439 if (!Older->getParamDecl(p)->hasDefaultArg()) 440 break; 441 442 OldParam = Older->getParamDecl(p); 443 } 444 445 Diag(OldParam->getLocation(), diag::note_previous_definition) 446 << OldParam->getDefaultArgRange(); 447 } else if (OldParam->hasDefaultArg()) { 448 // Merge the old default argument into the new parameter. 449 // It's important to use getInit() here; getDefaultArg() 450 // strips off any top-level ExprWithCleanups. 451 NewParam->setHasInheritedDefaultArg(); 452 if (OldParam->hasUninstantiatedDefaultArg()) 453 NewParam->setUninstantiatedDefaultArg( 454 OldParam->getUninstantiatedDefaultArg()); 455 else 456 NewParam->setDefaultArg(OldParam->getInit()); 457 } else if (NewParam->hasDefaultArg()) { 458 if (New->getDescribedFunctionTemplate()) { 459 // Paragraph 4, quoted above, only applies to non-template functions. 460 Diag(NewParam->getLocation(), 461 diag::err_param_default_argument_template_redecl) 462 << NewParam->getDefaultArgRange(); 463 Diag(Old->getLocation(), diag::note_template_prev_declaration) 464 << false; 465 } else if (New->getTemplateSpecializationKind() 466 != TSK_ImplicitInstantiation && 467 New->getTemplateSpecializationKind() != TSK_Undeclared) { 468 // C++ [temp.expr.spec]p21: 469 // Default function arguments shall not be specified in a declaration 470 // or a definition for one of the following explicit specializations: 471 // - the explicit specialization of a function template; 472 // - the explicit specialization of a member function template; 473 // - the explicit specialization of a member function of a class 474 // template where the class template specialization to which the 475 // member function specialization belongs is implicitly 476 // instantiated. 477 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 478 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 479 << New->getDeclName() 480 << NewParam->getDefaultArgRange(); 481 } else if (New->getDeclContext()->isDependentContext()) { 482 // C++ [dcl.fct.default]p6 (DR217): 483 // Default arguments for a member function of a class template shall 484 // be specified on the initial declaration of the member function 485 // within the class template. 486 // 487 // Reading the tea leaves a bit in DR217 and its reference to DR205 488 // leads me to the conclusion that one cannot add default function 489 // arguments for an out-of-line definition of a member function of a 490 // dependent type. 491 int WhichKind = 2; 492 if (CXXRecordDecl *Record 493 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 494 if (Record->getDescribedClassTemplate()) 495 WhichKind = 0; 496 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 497 WhichKind = 1; 498 else 499 WhichKind = 2; 500 } 501 502 Diag(NewParam->getLocation(), 503 diag::err_param_default_argument_member_template_redecl) 504 << WhichKind 505 << NewParam->getDefaultArgRange(); 506 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 507 CXXSpecialMember NewSM = getSpecialMember(Ctor), 508 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 509 if (NewSM != OldSM) { 510 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 511 << NewParam->getDefaultArgRange() << NewSM; 512 Diag(Old->getLocation(), diag::note_previous_declaration_special) 513 << OldSM; 514 } 515 } 516 } 517 } 518 519 // C++0x [dcl.constexpr]p1: If any declaration of a function or function 520 // template has a constexpr specifier then all its declarations shall 521 // contain the constexpr specifier. [Note: An explicit specialization can 522 // differ from the template declaration with respect to the constexpr 523 // specifier. -- end note] 524 // 525 // FIXME: Don't reject changes in constexpr in explicit specializations. 526 if (New->isConstexpr() != Old->isConstexpr()) { 527 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 528 << New << New->isConstexpr(); 529 Diag(Old->getLocation(), diag::note_previous_declaration); 530 Invalid = true; 531 } 532 533 if (CheckEquivalentExceptionSpec(Old, New)) 534 Invalid = true; 535 536 return Invalid; 537} 538 539/// \brief Merge the exception specifications of two variable declarations. 540/// 541/// This is called when there's a redeclaration of a VarDecl. The function 542/// checks if the redeclaration might have an exception specification and 543/// validates compatibility and merges the specs if necessary. 544void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 545 // Shortcut if exceptions are disabled. 546 if (!getLangOptions().CXXExceptions) 547 return; 548 549 assert(Context.hasSameType(New->getType(), Old->getType()) && 550 "Should only be called if types are otherwise the same."); 551 552 QualType NewType = New->getType(); 553 QualType OldType = Old->getType(); 554 555 // We're only interested in pointers and references to functions, as well 556 // as pointers to member functions. 557 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 558 NewType = R->getPointeeType(); 559 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 560 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 561 NewType = P->getPointeeType(); 562 OldType = OldType->getAs<PointerType>()->getPointeeType(); 563 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 564 NewType = M->getPointeeType(); 565 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 566 } 567 568 if (!NewType->isFunctionProtoType()) 569 return; 570 571 // There's lots of special cases for functions. For function pointers, system 572 // libraries are hopefully not as broken so that we don't need these 573 // workarounds. 574 if (CheckEquivalentExceptionSpec( 575 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 576 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 577 New->setInvalidDecl(); 578 } 579} 580 581/// CheckCXXDefaultArguments - Verify that the default arguments for a 582/// function declaration are well-formed according to C++ 583/// [dcl.fct.default]. 584void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 585 unsigned NumParams = FD->getNumParams(); 586 unsigned p; 587 588 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 589 isa<CXXMethodDecl>(FD) && 590 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 591 592 // Find first parameter with a default argument 593 for (p = 0; p < NumParams; ++p) { 594 ParmVarDecl *Param = FD->getParamDecl(p); 595 if (Param->hasDefaultArg()) { 596 // C++11 [expr.prim.lambda]p5: 597 // [...] Default arguments (8.3.6) shall not be specified in the 598 // parameter-declaration-clause of a lambda-declarator. 599 // 600 // FIXME: Core issue 974 strikes this sentence, we only provide an 601 // extension warning. 602 if (IsLambda) 603 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 604 << Param->getDefaultArgRange(); 605 break; 606 } 607 } 608 609 // C++ [dcl.fct.default]p4: 610 // In a given function declaration, all parameters 611 // subsequent to a parameter with a default argument shall 612 // have default arguments supplied in this or previous 613 // declarations. A default argument shall not be redefined 614 // by a later declaration (not even to the same value). 615 unsigned LastMissingDefaultArg = 0; 616 for (; p < NumParams; ++p) { 617 ParmVarDecl *Param = FD->getParamDecl(p); 618 if (!Param->hasDefaultArg()) { 619 if (Param->isInvalidDecl()) 620 /* We already complained about this parameter. */; 621 else if (Param->getIdentifier()) 622 Diag(Param->getLocation(), 623 diag::err_param_default_argument_missing_name) 624 << Param->getIdentifier(); 625 else 626 Diag(Param->getLocation(), 627 diag::err_param_default_argument_missing); 628 629 LastMissingDefaultArg = p; 630 } 631 } 632 633 if (LastMissingDefaultArg > 0) { 634 // Some default arguments were missing. Clear out all of the 635 // default arguments up to (and including) the last missing 636 // default argument, so that we leave the function parameters 637 // in a semantically valid state. 638 for (p = 0; p <= LastMissingDefaultArg; ++p) { 639 ParmVarDecl *Param = FD->getParamDecl(p); 640 if (Param->hasDefaultArg()) { 641 Param->setDefaultArg(0); 642 } 643 } 644 } 645} 646 647// CheckConstexprParameterTypes - Check whether a function's parameter types 648// are all literal types. If so, return true. If not, produce a suitable 649// diagnostic and return false. 650static bool CheckConstexprParameterTypes(Sema &SemaRef, 651 const FunctionDecl *FD) { 652 unsigned ArgIndex = 0; 653 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 654 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 655 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 656 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 657 SourceLocation ParamLoc = PD->getLocation(); 658 if (!(*i)->isDependentType() && 659 SemaRef.RequireLiteralType(ParamLoc, *i, 660 SemaRef.PDiag(diag::err_constexpr_non_literal_param) 661 << ArgIndex+1 << PD->getSourceRange() 662 << isa<CXXConstructorDecl>(FD))) 663 return false; 664 } 665 return true; 666} 667 668// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 669// the requirements of a constexpr function definition or a constexpr 670// constructor definition. If so, return true. If not, produce appropriate 671// diagnostics and return false. 672// 673// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 674bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 675 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 676 if (MD && MD->isInstance()) { 677 // C++11 [dcl.constexpr]p4: 678 // The definition of a constexpr constructor shall satisfy the following 679 // constraints: 680 // - the class shall not have any virtual base classes; 681 const CXXRecordDecl *RD = MD->getParent(); 682 if (RD->getNumVBases()) { 683 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 684 << isa<CXXConstructorDecl>(NewFD) << RD->isStruct() 685 << RD->getNumVBases(); 686 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 687 E = RD->vbases_end(); I != E; ++I) 688 Diag(I->getSourceRange().getBegin(), 689 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 690 return false; 691 } 692 } 693 694 if (!isa<CXXConstructorDecl>(NewFD)) { 695 // C++11 [dcl.constexpr]p3: 696 // The definition of a constexpr function shall satisfy the following 697 // constraints: 698 // - it shall not be virtual; 699 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 700 if (Method && Method->isVirtual()) { 701 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 702 703 // If it's not obvious why this function is virtual, find an overridden 704 // function which uses the 'virtual' keyword. 705 const CXXMethodDecl *WrittenVirtual = Method; 706 while (!WrittenVirtual->isVirtualAsWritten()) 707 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 708 if (WrittenVirtual != Method) 709 Diag(WrittenVirtual->getLocation(), 710 diag::note_overridden_virtual_function); 711 return false; 712 } 713 714 // - its return type shall be a literal type; 715 QualType RT = NewFD->getResultType(); 716 if (!RT->isDependentType() && 717 RequireLiteralType(NewFD->getLocation(), RT, 718 PDiag(diag::err_constexpr_non_literal_return))) 719 return false; 720 } 721 722 // - each of its parameter types shall be a literal type; 723 if (!CheckConstexprParameterTypes(*this, NewFD)) 724 return false; 725 726 return true; 727} 728 729/// Check the given declaration statement is legal within a constexpr function 730/// body. C++0x [dcl.constexpr]p3,p4. 731/// 732/// \return true if the body is OK, false if we have diagnosed a problem. 733static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 734 DeclStmt *DS) { 735 // C++0x [dcl.constexpr]p3 and p4: 736 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 737 // contain only 738 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 739 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 740 switch ((*DclIt)->getKind()) { 741 case Decl::StaticAssert: 742 case Decl::Using: 743 case Decl::UsingShadow: 744 case Decl::UsingDirective: 745 case Decl::UnresolvedUsingTypename: 746 // - static_assert-declarations 747 // - using-declarations, 748 // - using-directives, 749 continue; 750 751 case Decl::Typedef: 752 case Decl::TypeAlias: { 753 // - typedef declarations and alias-declarations that do not define 754 // classes or enumerations, 755 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 756 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 757 // Don't allow variably-modified types in constexpr functions. 758 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 759 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 760 << TL.getSourceRange() << TL.getType() 761 << isa<CXXConstructorDecl>(Dcl); 762 return false; 763 } 764 continue; 765 } 766 767 case Decl::Enum: 768 case Decl::CXXRecord: 769 // As an extension, we allow the declaration (but not the definition) of 770 // classes and enumerations in all declarations, not just in typedef and 771 // alias declarations. 772 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 773 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 774 << isa<CXXConstructorDecl>(Dcl); 775 return false; 776 } 777 continue; 778 779 case Decl::Var: 780 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 781 << isa<CXXConstructorDecl>(Dcl); 782 return false; 783 784 default: 785 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 786 << isa<CXXConstructorDecl>(Dcl); 787 return false; 788 } 789 } 790 791 return true; 792} 793 794/// Check that the given field is initialized within a constexpr constructor. 795/// 796/// \param Dcl The constexpr constructor being checked. 797/// \param Field The field being checked. This may be a member of an anonymous 798/// struct or union nested within the class being checked. 799/// \param Inits All declarations, including anonymous struct/union members and 800/// indirect members, for which any initialization was provided. 801/// \param Diagnosed Set to true if an error is produced. 802static void CheckConstexprCtorInitializer(Sema &SemaRef, 803 const FunctionDecl *Dcl, 804 FieldDecl *Field, 805 llvm::SmallSet<Decl*, 16> &Inits, 806 bool &Diagnosed) { 807 if (Field->isUnnamedBitfield()) 808 return; 809 810 if (Field->isAnonymousStructOrUnion() && 811 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 812 return; 813 814 if (!Inits.count(Field)) { 815 if (!Diagnosed) { 816 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 817 Diagnosed = true; 818 } 819 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 820 } else if (Field->isAnonymousStructOrUnion()) { 821 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 822 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 823 I != E; ++I) 824 // If an anonymous union contains an anonymous struct of which any member 825 // is initialized, all members must be initialized. 826 if (!RD->isUnion() || Inits.count(*I)) 827 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 828 } 829} 830 831/// Check the body for the given constexpr function declaration only contains 832/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 833/// 834/// \return true if the body is OK, false if we have diagnosed a problem. 835bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 836 if (isa<CXXTryStmt>(Body)) { 837 // C++11 [dcl.constexpr]p3: 838 // The definition of a constexpr function shall satisfy the following 839 // constraints: [...] 840 // - its function-body shall be = delete, = default, or a 841 // compound-statement 842 // 843 // C++11 [dcl.constexpr]p4: 844 // In the definition of a constexpr constructor, [...] 845 // - its function-body shall not be a function-try-block; 846 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 847 << isa<CXXConstructorDecl>(Dcl); 848 return false; 849 } 850 851 // - its function-body shall be [...] a compound-statement that contains only 852 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 853 854 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 855 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 856 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 857 switch ((*BodyIt)->getStmtClass()) { 858 case Stmt::NullStmtClass: 859 // - null statements, 860 continue; 861 862 case Stmt::DeclStmtClass: 863 // - static_assert-declarations 864 // - using-declarations, 865 // - using-directives, 866 // - typedef declarations and alias-declarations that do not define 867 // classes or enumerations, 868 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 869 return false; 870 continue; 871 872 case Stmt::ReturnStmtClass: 873 // - and exactly one return statement; 874 if (isa<CXXConstructorDecl>(Dcl)) 875 break; 876 877 ReturnStmts.push_back((*BodyIt)->getLocStart()); 878 continue; 879 880 default: 881 break; 882 } 883 884 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 885 << isa<CXXConstructorDecl>(Dcl); 886 return false; 887 } 888 889 if (const CXXConstructorDecl *Constructor 890 = dyn_cast<CXXConstructorDecl>(Dcl)) { 891 const CXXRecordDecl *RD = Constructor->getParent(); 892 // DR1359: 893 // - every non-variant non-static data member and base class sub-object 894 // shall be initialized; 895 // - if the class is a non-empty union, or for each non-empty anonymous 896 // union member of a non-union class, exactly one non-static data member 897 // shall be initialized; 898 if (RD->isUnion()) { 899 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 900 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 901 return false; 902 } 903 } else if (!Constructor->isDependentContext() && 904 !Constructor->isDelegatingConstructor()) { 905 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 906 907 // Skip detailed checking if we have enough initializers, and we would 908 // allow at most one initializer per member. 909 bool AnyAnonStructUnionMembers = false; 910 unsigned Fields = 0; 911 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 912 E = RD->field_end(); I != E; ++I, ++Fields) { 913 if ((*I)->isAnonymousStructOrUnion()) { 914 AnyAnonStructUnionMembers = true; 915 break; 916 } 917 } 918 if (AnyAnonStructUnionMembers || 919 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 920 // Check initialization of non-static data members. Base classes are 921 // always initialized so do not need to be checked. Dependent bases 922 // might not have initializers in the member initializer list. 923 llvm::SmallSet<Decl*, 16> Inits; 924 for (CXXConstructorDecl::init_const_iterator 925 I = Constructor->init_begin(), E = Constructor->init_end(); 926 I != E; ++I) { 927 if (FieldDecl *FD = (*I)->getMember()) 928 Inits.insert(FD); 929 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 930 Inits.insert(ID->chain_begin(), ID->chain_end()); 931 } 932 933 bool Diagnosed = false; 934 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 935 E = RD->field_end(); I != E; ++I) 936 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 937 if (Diagnosed) 938 return false; 939 } 940 } 941 } else { 942 if (ReturnStmts.empty()) { 943 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 944 return false; 945 } 946 if (ReturnStmts.size() > 1) { 947 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 948 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 949 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 950 return false; 951 } 952 } 953 954 // C++11 [dcl.constexpr]p5: 955 // if no function argument values exist such that the function invocation 956 // substitution would produce a constant expression, the program is 957 // ill-formed; no diagnostic required. 958 // C++11 [dcl.constexpr]p3: 959 // - every constructor call and implicit conversion used in initializing the 960 // return value shall be one of those allowed in a constant expression. 961 // C++11 [dcl.constexpr]p4: 962 // - every constructor involved in initializing non-static data members and 963 // base class sub-objects shall be a constexpr constructor. 964 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 965 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 966 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 967 << isa<CXXConstructorDecl>(Dcl); 968 for (size_t I = 0, N = Diags.size(); I != N; ++I) 969 Diag(Diags[I].first, Diags[I].second); 970 return false; 971 } 972 973 return true; 974} 975 976/// isCurrentClassName - Determine whether the identifier II is the 977/// name of the class type currently being defined. In the case of 978/// nested classes, this will only return true if II is the name of 979/// the innermost class. 980bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 981 const CXXScopeSpec *SS) { 982 assert(getLangOptions().CPlusPlus && "No class names in C!"); 983 984 CXXRecordDecl *CurDecl; 985 if (SS && SS->isSet() && !SS->isInvalid()) { 986 DeclContext *DC = computeDeclContext(*SS, true); 987 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 988 } else 989 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 990 991 if (CurDecl && CurDecl->getIdentifier()) 992 return &II == CurDecl->getIdentifier(); 993 else 994 return false; 995} 996 997/// \brief Check the validity of a C++ base class specifier. 998/// 999/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1000/// and returns NULL otherwise. 1001CXXBaseSpecifier * 1002Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1003 SourceRange SpecifierRange, 1004 bool Virtual, AccessSpecifier Access, 1005 TypeSourceInfo *TInfo, 1006 SourceLocation EllipsisLoc) { 1007 QualType BaseType = TInfo->getType(); 1008 1009 // C++ [class.union]p1: 1010 // A union shall not have base classes. 1011 if (Class->isUnion()) { 1012 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1013 << SpecifierRange; 1014 return 0; 1015 } 1016 1017 if (EllipsisLoc.isValid() && 1018 !TInfo->getType()->containsUnexpandedParameterPack()) { 1019 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1020 << TInfo->getTypeLoc().getSourceRange(); 1021 EllipsisLoc = SourceLocation(); 1022 } 1023 1024 if (BaseType->isDependentType()) 1025 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1026 Class->getTagKind() == TTK_Class, 1027 Access, TInfo, EllipsisLoc); 1028 1029 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1030 1031 // Base specifiers must be record types. 1032 if (!BaseType->isRecordType()) { 1033 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1034 return 0; 1035 } 1036 1037 // C++ [class.union]p1: 1038 // A union shall not be used as a base class. 1039 if (BaseType->isUnionType()) { 1040 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1041 return 0; 1042 } 1043 1044 // C++ [class.derived]p2: 1045 // The class-name in a base-specifier shall not be an incompletely 1046 // defined class. 1047 if (RequireCompleteType(BaseLoc, BaseType, 1048 PDiag(diag::err_incomplete_base_class) 1049 << SpecifierRange)) { 1050 Class->setInvalidDecl(); 1051 return 0; 1052 } 1053 1054 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1055 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1056 assert(BaseDecl && "Record type has no declaration"); 1057 BaseDecl = BaseDecl->getDefinition(); 1058 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1059 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1060 assert(CXXBaseDecl && "Base type is not a C++ type"); 1061 1062 // C++ [class]p3: 1063 // If a class is marked final and it appears as a base-type-specifier in 1064 // base-clause, the program is ill-formed. 1065 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1066 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1067 << CXXBaseDecl->getDeclName(); 1068 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1069 << CXXBaseDecl->getDeclName(); 1070 return 0; 1071 } 1072 1073 if (BaseDecl->isInvalidDecl()) 1074 Class->setInvalidDecl(); 1075 1076 // Create the base specifier. 1077 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1078 Class->getTagKind() == TTK_Class, 1079 Access, TInfo, EllipsisLoc); 1080} 1081 1082/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1083/// one entry in the base class list of a class specifier, for 1084/// example: 1085/// class foo : public bar, virtual private baz { 1086/// 'public bar' and 'virtual private baz' are each base-specifiers. 1087BaseResult 1088Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1089 bool Virtual, AccessSpecifier Access, 1090 ParsedType basetype, SourceLocation BaseLoc, 1091 SourceLocation EllipsisLoc) { 1092 if (!classdecl) 1093 return true; 1094 1095 AdjustDeclIfTemplate(classdecl); 1096 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1097 if (!Class) 1098 return true; 1099 1100 TypeSourceInfo *TInfo = 0; 1101 GetTypeFromParser(basetype, &TInfo); 1102 1103 if (EllipsisLoc.isInvalid() && 1104 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1105 UPPC_BaseType)) 1106 return true; 1107 1108 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1109 Virtual, Access, TInfo, 1110 EllipsisLoc)) 1111 return BaseSpec; 1112 1113 return true; 1114} 1115 1116/// \brief Performs the actual work of attaching the given base class 1117/// specifiers to a C++ class. 1118bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1119 unsigned NumBases) { 1120 if (NumBases == 0) 1121 return false; 1122 1123 // Used to keep track of which base types we have already seen, so 1124 // that we can properly diagnose redundant direct base types. Note 1125 // that the key is always the unqualified canonical type of the base 1126 // class. 1127 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1128 1129 // Copy non-redundant base specifiers into permanent storage. 1130 unsigned NumGoodBases = 0; 1131 bool Invalid = false; 1132 for (unsigned idx = 0; idx < NumBases; ++idx) { 1133 QualType NewBaseType 1134 = Context.getCanonicalType(Bases[idx]->getType()); 1135 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1136 if (KnownBaseTypes[NewBaseType]) { 1137 // C++ [class.mi]p3: 1138 // A class shall not be specified as a direct base class of a 1139 // derived class more than once. 1140 Diag(Bases[idx]->getSourceRange().getBegin(), 1141 diag::err_duplicate_base_class) 1142 << KnownBaseTypes[NewBaseType]->getType() 1143 << Bases[idx]->getSourceRange(); 1144 1145 // Delete the duplicate base class specifier; we're going to 1146 // overwrite its pointer later. 1147 Context.Deallocate(Bases[idx]); 1148 1149 Invalid = true; 1150 } else { 1151 // Okay, add this new base class. 1152 KnownBaseTypes[NewBaseType] = Bases[idx]; 1153 Bases[NumGoodBases++] = Bases[idx]; 1154 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1155 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1156 if (RD->hasAttr<WeakAttr>()) 1157 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1158 } 1159 } 1160 1161 // Attach the remaining base class specifiers to the derived class. 1162 Class->setBases(Bases, NumGoodBases); 1163 1164 // Delete the remaining (good) base class specifiers, since their 1165 // data has been copied into the CXXRecordDecl. 1166 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1167 Context.Deallocate(Bases[idx]); 1168 1169 return Invalid; 1170} 1171 1172/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1173/// class, after checking whether there are any duplicate base 1174/// classes. 1175void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1176 unsigned NumBases) { 1177 if (!ClassDecl || !Bases || !NumBases) 1178 return; 1179 1180 AdjustDeclIfTemplate(ClassDecl); 1181 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1182 (CXXBaseSpecifier**)(Bases), NumBases); 1183} 1184 1185static CXXRecordDecl *GetClassForType(QualType T) { 1186 if (const RecordType *RT = T->getAs<RecordType>()) 1187 return cast<CXXRecordDecl>(RT->getDecl()); 1188 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1189 return ICT->getDecl(); 1190 else 1191 return 0; 1192} 1193 1194/// \brief Determine whether the type \p Derived is a C++ class that is 1195/// derived from the type \p Base. 1196bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1197 if (!getLangOptions().CPlusPlus) 1198 return false; 1199 1200 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1201 if (!DerivedRD) 1202 return false; 1203 1204 CXXRecordDecl *BaseRD = GetClassForType(Base); 1205 if (!BaseRD) 1206 return false; 1207 1208 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1209 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1210} 1211 1212/// \brief Determine whether the type \p Derived is a C++ class that is 1213/// derived from the type \p Base. 1214bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1215 if (!getLangOptions().CPlusPlus) 1216 return false; 1217 1218 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1219 if (!DerivedRD) 1220 return false; 1221 1222 CXXRecordDecl *BaseRD = GetClassForType(Base); 1223 if (!BaseRD) 1224 return false; 1225 1226 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1227} 1228 1229void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1230 CXXCastPath &BasePathArray) { 1231 assert(BasePathArray.empty() && "Base path array must be empty!"); 1232 assert(Paths.isRecordingPaths() && "Must record paths!"); 1233 1234 const CXXBasePath &Path = Paths.front(); 1235 1236 // We first go backward and check if we have a virtual base. 1237 // FIXME: It would be better if CXXBasePath had the base specifier for 1238 // the nearest virtual base. 1239 unsigned Start = 0; 1240 for (unsigned I = Path.size(); I != 0; --I) { 1241 if (Path[I - 1].Base->isVirtual()) { 1242 Start = I - 1; 1243 break; 1244 } 1245 } 1246 1247 // Now add all bases. 1248 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1249 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1250} 1251 1252/// \brief Determine whether the given base path includes a virtual 1253/// base class. 1254bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1255 for (CXXCastPath::const_iterator B = BasePath.begin(), 1256 BEnd = BasePath.end(); 1257 B != BEnd; ++B) 1258 if ((*B)->isVirtual()) 1259 return true; 1260 1261 return false; 1262} 1263 1264/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1265/// conversion (where Derived and Base are class types) is 1266/// well-formed, meaning that the conversion is unambiguous (and 1267/// that all of the base classes are accessible). Returns true 1268/// and emits a diagnostic if the code is ill-formed, returns false 1269/// otherwise. Loc is the location where this routine should point to 1270/// if there is an error, and Range is the source range to highlight 1271/// if there is an error. 1272bool 1273Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1274 unsigned InaccessibleBaseID, 1275 unsigned AmbigiousBaseConvID, 1276 SourceLocation Loc, SourceRange Range, 1277 DeclarationName Name, 1278 CXXCastPath *BasePath) { 1279 // First, determine whether the path from Derived to Base is 1280 // ambiguous. This is slightly more expensive than checking whether 1281 // the Derived to Base conversion exists, because here we need to 1282 // explore multiple paths to determine if there is an ambiguity. 1283 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1284 /*DetectVirtual=*/false); 1285 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1286 assert(DerivationOkay && 1287 "Can only be used with a derived-to-base conversion"); 1288 (void)DerivationOkay; 1289 1290 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1291 if (InaccessibleBaseID) { 1292 // Check that the base class can be accessed. 1293 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1294 InaccessibleBaseID)) { 1295 case AR_inaccessible: 1296 return true; 1297 case AR_accessible: 1298 case AR_dependent: 1299 case AR_delayed: 1300 break; 1301 } 1302 } 1303 1304 // Build a base path if necessary. 1305 if (BasePath) 1306 BuildBasePathArray(Paths, *BasePath); 1307 return false; 1308 } 1309 1310 // We know that the derived-to-base conversion is ambiguous, and 1311 // we're going to produce a diagnostic. Perform the derived-to-base 1312 // search just one more time to compute all of the possible paths so 1313 // that we can print them out. This is more expensive than any of 1314 // the previous derived-to-base checks we've done, but at this point 1315 // performance isn't as much of an issue. 1316 Paths.clear(); 1317 Paths.setRecordingPaths(true); 1318 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1319 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1320 (void)StillOkay; 1321 1322 // Build up a textual representation of the ambiguous paths, e.g., 1323 // D -> B -> A, that will be used to illustrate the ambiguous 1324 // conversions in the diagnostic. We only print one of the paths 1325 // to each base class subobject. 1326 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1327 1328 Diag(Loc, AmbigiousBaseConvID) 1329 << Derived << Base << PathDisplayStr << Range << Name; 1330 return true; 1331} 1332 1333bool 1334Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1335 SourceLocation Loc, SourceRange Range, 1336 CXXCastPath *BasePath, 1337 bool IgnoreAccess) { 1338 return CheckDerivedToBaseConversion(Derived, Base, 1339 IgnoreAccess ? 0 1340 : diag::err_upcast_to_inaccessible_base, 1341 diag::err_ambiguous_derived_to_base_conv, 1342 Loc, Range, DeclarationName(), 1343 BasePath); 1344} 1345 1346 1347/// @brief Builds a string representing ambiguous paths from a 1348/// specific derived class to different subobjects of the same base 1349/// class. 1350/// 1351/// This function builds a string that can be used in error messages 1352/// to show the different paths that one can take through the 1353/// inheritance hierarchy to go from the derived class to different 1354/// subobjects of a base class. The result looks something like this: 1355/// @code 1356/// struct D -> struct B -> struct A 1357/// struct D -> struct C -> struct A 1358/// @endcode 1359std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1360 std::string PathDisplayStr; 1361 std::set<unsigned> DisplayedPaths; 1362 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1363 Path != Paths.end(); ++Path) { 1364 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1365 // We haven't displayed a path to this particular base 1366 // class subobject yet. 1367 PathDisplayStr += "\n "; 1368 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1369 for (CXXBasePath::const_iterator Element = Path->begin(); 1370 Element != Path->end(); ++Element) 1371 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1372 } 1373 } 1374 1375 return PathDisplayStr; 1376} 1377 1378//===----------------------------------------------------------------------===// 1379// C++ class member Handling 1380//===----------------------------------------------------------------------===// 1381 1382/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1383bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1384 SourceLocation ASLoc, 1385 SourceLocation ColonLoc, 1386 AttributeList *Attrs) { 1387 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1388 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1389 ASLoc, ColonLoc); 1390 CurContext->addHiddenDecl(ASDecl); 1391 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1392} 1393 1394/// CheckOverrideControl - Check C++0x override control semantics. 1395void Sema::CheckOverrideControl(const Decl *D) { 1396 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1397 if (!MD || !MD->isVirtual()) 1398 return; 1399 1400 if (MD->isDependentContext()) 1401 return; 1402 1403 // C++0x [class.virtual]p3: 1404 // If a virtual function is marked with the virt-specifier override and does 1405 // not override a member function of a base class, 1406 // the program is ill-formed. 1407 bool HasOverriddenMethods = 1408 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1409 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1410 Diag(MD->getLocation(), 1411 diag::err_function_marked_override_not_overriding) 1412 << MD->getDeclName(); 1413 return; 1414 } 1415} 1416 1417/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1418/// function overrides a virtual member function marked 'final', according to 1419/// C++0x [class.virtual]p3. 1420bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1421 const CXXMethodDecl *Old) { 1422 if (!Old->hasAttr<FinalAttr>()) 1423 return false; 1424 1425 Diag(New->getLocation(), diag::err_final_function_overridden) 1426 << New->getDeclName(); 1427 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1428 return true; 1429} 1430 1431/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1432/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1433/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1434/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1435/// present but parsing it has been deferred. 1436Decl * 1437Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1438 MultiTemplateParamsArg TemplateParameterLists, 1439 Expr *BW, const VirtSpecifiers &VS, 1440 bool HasDeferredInit) { 1441 const DeclSpec &DS = D.getDeclSpec(); 1442 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1443 DeclarationName Name = NameInfo.getName(); 1444 SourceLocation Loc = NameInfo.getLoc(); 1445 1446 // For anonymous bitfields, the location should point to the type. 1447 if (Loc.isInvalid()) 1448 Loc = D.getSourceRange().getBegin(); 1449 1450 Expr *BitWidth = static_cast<Expr*>(BW); 1451 1452 assert(isa<CXXRecordDecl>(CurContext)); 1453 assert(!DS.isFriendSpecified()); 1454 1455 bool isFunc = D.isDeclarationOfFunction(); 1456 1457 // C++ 9.2p6: A member shall not be declared to have automatic storage 1458 // duration (auto, register) or with the extern storage-class-specifier. 1459 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1460 // data members and cannot be applied to names declared const or static, 1461 // and cannot be applied to reference members. 1462 switch (DS.getStorageClassSpec()) { 1463 case DeclSpec::SCS_unspecified: 1464 case DeclSpec::SCS_typedef: 1465 case DeclSpec::SCS_static: 1466 // FALL THROUGH. 1467 break; 1468 case DeclSpec::SCS_mutable: 1469 if (isFunc) { 1470 if (DS.getStorageClassSpecLoc().isValid()) 1471 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1472 else 1473 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1474 1475 // FIXME: It would be nicer if the keyword was ignored only for this 1476 // declarator. Otherwise we could get follow-up errors. 1477 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1478 } 1479 break; 1480 default: 1481 if (DS.getStorageClassSpecLoc().isValid()) 1482 Diag(DS.getStorageClassSpecLoc(), 1483 diag::err_storageclass_invalid_for_member); 1484 else 1485 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1486 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1487 } 1488 1489 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1490 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1491 !isFunc); 1492 1493 Decl *Member; 1494 if (isInstField) { 1495 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1496 1497 // Data members must have identifiers for names. 1498 if (Name.getNameKind() != DeclarationName::Identifier) { 1499 Diag(Loc, diag::err_bad_variable_name) 1500 << Name; 1501 return 0; 1502 } 1503 1504 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1505 1506 // Member field could not be with "template" keyword. 1507 // So TemplateParameterLists should be empty in this case. 1508 if (TemplateParameterLists.size()) { 1509 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1510 if (TemplateParams->size()) { 1511 // There is no such thing as a member field template. 1512 Diag(D.getIdentifierLoc(), diag::err_template_member) 1513 << II 1514 << SourceRange(TemplateParams->getTemplateLoc(), 1515 TemplateParams->getRAngleLoc()); 1516 } else { 1517 // There is an extraneous 'template<>' for this member. 1518 Diag(TemplateParams->getTemplateLoc(), 1519 diag::err_template_member_noparams) 1520 << II 1521 << SourceRange(TemplateParams->getTemplateLoc(), 1522 TemplateParams->getRAngleLoc()); 1523 } 1524 return 0; 1525 } 1526 1527 if (SS.isSet() && !SS.isInvalid()) { 1528 // The user provided a superfluous scope specifier inside a class 1529 // definition: 1530 // 1531 // class X { 1532 // int X::member; 1533 // }; 1534 DeclContext *DC = 0; 1535 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1536 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1537 << Name << FixItHint::CreateRemoval(SS.getRange()); 1538 else 1539 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1540 << Name << SS.getRange(); 1541 1542 SS.clear(); 1543 } 1544 1545 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1546 HasDeferredInit, AS); 1547 assert(Member && "HandleField never returns null"); 1548 } else { 1549 assert(!HasDeferredInit); 1550 1551 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1552 if (!Member) { 1553 return 0; 1554 } 1555 1556 // Non-instance-fields can't have a bitfield. 1557 if (BitWidth) { 1558 if (Member->isInvalidDecl()) { 1559 // don't emit another diagnostic. 1560 } else if (isa<VarDecl>(Member)) { 1561 // C++ 9.6p3: A bit-field shall not be a static member. 1562 // "static member 'A' cannot be a bit-field" 1563 Diag(Loc, diag::err_static_not_bitfield) 1564 << Name << BitWidth->getSourceRange(); 1565 } else if (isa<TypedefDecl>(Member)) { 1566 // "typedef member 'x' cannot be a bit-field" 1567 Diag(Loc, diag::err_typedef_not_bitfield) 1568 << Name << BitWidth->getSourceRange(); 1569 } else { 1570 // A function typedef ("typedef int f(); f a;"). 1571 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1572 Diag(Loc, diag::err_not_integral_type_bitfield) 1573 << Name << cast<ValueDecl>(Member)->getType() 1574 << BitWidth->getSourceRange(); 1575 } 1576 1577 BitWidth = 0; 1578 Member->setInvalidDecl(); 1579 } 1580 1581 Member->setAccess(AS); 1582 1583 // If we have declared a member function template, set the access of the 1584 // templated declaration as well. 1585 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1586 FunTmpl->getTemplatedDecl()->setAccess(AS); 1587 } 1588 1589 if (VS.isOverrideSpecified()) { 1590 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1591 if (!MD || !MD->isVirtual()) { 1592 Diag(Member->getLocStart(), 1593 diag::override_keyword_only_allowed_on_virtual_member_functions) 1594 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1595 } else 1596 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1597 } 1598 if (VS.isFinalSpecified()) { 1599 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1600 if (!MD || !MD->isVirtual()) { 1601 Diag(Member->getLocStart(), 1602 diag::override_keyword_only_allowed_on_virtual_member_functions) 1603 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1604 } else 1605 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1606 } 1607 1608 if (VS.getLastLocation().isValid()) { 1609 // Update the end location of a method that has a virt-specifiers. 1610 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1611 MD->setRangeEnd(VS.getLastLocation()); 1612 } 1613 1614 CheckOverrideControl(Member); 1615 1616 assert((Name || isInstField) && "No identifier for non-field ?"); 1617 1618 if (isInstField) 1619 FieldCollector->Add(cast<FieldDecl>(Member)); 1620 return Member; 1621} 1622 1623/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1624/// in-class initializer for a non-static C++ class member, and after 1625/// instantiating an in-class initializer in a class template. Such actions 1626/// are deferred until the class is complete. 1627void 1628Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1629 Expr *InitExpr) { 1630 FieldDecl *FD = cast<FieldDecl>(D); 1631 1632 if (!InitExpr) { 1633 FD->setInvalidDecl(); 1634 FD->removeInClassInitializer(); 1635 return; 1636 } 1637 1638 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1639 FD->setInvalidDecl(); 1640 FD->removeInClassInitializer(); 1641 return; 1642 } 1643 1644 ExprResult Init = InitExpr; 1645 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1646 // FIXME: if there is no EqualLoc, this is list-initialization. 1647 Init = PerformCopyInitialization( 1648 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1649 if (Init.isInvalid()) { 1650 FD->setInvalidDecl(); 1651 return; 1652 } 1653 1654 CheckImplicitConversions(Init.get(), EqualLoc); 1655 } 1656 1657 // C++0x [class.base.init]p7: 1658 // The initialization of each base and member constitutes a 1659 // full-expression. 1660 Init = MaybeCreateExprWithCleanups(Init); 1661 if (Init.isInvalid()) { 1662 FD->setInvalidDecl(); 1663 return; 1664 } 1665 1666 InitExpr = Init.release(); 1667 1668 FD->setInClassInitializer(InitExpr); 1669} 1670 1671/// \brief Find the direct and/or virtual base specifiers that 1672/// correspond to the given base type, for use in base initialization 1673/// within a constructor. 1674static bool FindBaseInitializer(Sema &SemaRef, 1675 CXXRecordDecl *ClassDecl, 1676 QualType BaseType, 1677 const CXXBaseSpecifier *&DirectBaseSpec, 1678 const CXXBaseSpecifier *&VirtualBaseSpec) { 1679 // First, check for a direct base class. 1680 DirectBaseSpec = 0; 1681 for (CXXRecordDecl::base_class_const_iterator Base 1682 = ClassDecl->bases_begin(); 1683 Base != ClassDecl->bases_end(); ++Base) { 1684 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1685 // We found a direct base of this type. That's what we're 1686 // initializing. 1687 DirectBaseSpec = &*Base; 1688 break; 1689 } 1690 } 1691 1692 // Check for a virtual base class. 1693 // FIXME: We might be able to short-circuit this if we know in advance that 1694 // there are no virtual bases. 1695 VirtualBaseSpec = 0; 1696 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1697 // We haven't found a base yet; search the class hierarchy for a 1698 // virtual base class. 1699 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1700 /*DetectVirtual=*/false); 1701 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1702 BaseType, Paths)) { 1703 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1704 Path != Paths.end(); ++Path) { 1705 if (Path->back().Base->isVirtual()) { 1706 VirtualBaseSpec = Path->back().Base; 1707 break; 1708 } 1709 } 1710 } 1711 } 1712 1713 return DirectBaseSpec || VirtualBaseSpec; 1714} 1715 1716/// \brief Handle a C++ member initializer using braced-init-list syntax. 1717MemInitResult 1718Sema::ActOnMemInitializer(Decl *ConstructorD, 1719 Scope *S, 1720 CXXScopeSpec &SS, 1721 IdentifierInfo *MemberOrBase, 1722 ParsedType TemplateTypeTy, 1723 const DeclSpec &DS, 1724 SourceLocation IdLoc, 1725 Expr *InitList, 1726 SourceLocation EllipsisLoc) { 1727 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1728 DS, IdLoc, InitList, 1729 EllipsisLoc); 1730} 1731 1732/// \brief Handle a C++ member initializer using parentheses syntax. 1733MemInitResult 1734Sema::ActOnMemInitializer(Decl *ConstructorD, 1735 Scope *S, 1736 CXXScopeSpec &SS, 1737 IdentifierInfo *MemberOrBase, 1738 ParsedType TemplateTypeTy, 1739 const DeclSpec &DS, 1740 SourceLocation IdLoc, 1741 SourceLocation LParenLoc, 1742 Expr **Args, unsigned NumArgs, 1743 SourceLocation RParenLoc, 1744 SourceLocation EllipsisLoc) { 1745 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1746 RParenLoc); 1747 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1748 DS, IdLoc, List, EllipsisLoc); 1749} 1750 1751namespace { 1752 1753// Callback to only accept typo corrections that can be a valid C++ member 1754// intializer: either a non-static field member or a base class. 1755class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1756 public: 1757 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1758 : ClassDecl(ClassDecl) {} 1759 1760 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1761 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1762 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1763 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1764 else 1765 return isa<TypeDecl>(ND); 1766 } 1767 return false; 1768 } 1769 1770 private: 1771 CXXRecordDecl *ClassDecl; 1772}; 1773 1774} 1775 1776/// \brief Handle a C++ member initializer. 1777MemInitResult 1778Sema::BuildMemInitializer(Decl *ConstructorD, 1779 Scope *S, 1780 CXXScopeSpec &SS, 1781 IdentifierInfo *MemberOrBase, 1782 ParsedType TemplateTypeTy, 1783 const DeclSpec &DS, 1784 SourceLocation IdLoc, 1785 Expr *Init, 1786 SourceLocation EllipsisLoc) { 1787 if (!ConstructorD) 1788 return true; 1789 1790 AdjustDeclIfTemplate(ConstructorD); 1791 1792 CXXConstructorDecl *Constructor 1793 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1794 if (!Constructor) { 1795 // The user wrote a constructor initializer on a function that is 1796 // not a C++ constructor. Ignore the error for now, because we may 1797 // have more member initializers coming; we'll diagnose it just 1798 // once in ActOnMemInitializers. 1799 return true; 1800 } 1801 1802 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1803 1804 // C++ [class.base.init]p2: 1805 // Names in a mem-initializer-id are looked up in the scope of the 1806 // constructor's class and, if not found in that scope, are looked 1807 // up in the scope containing the constructor's definition. 1808 // [Note: if the constructor's class contains a member with the 1809 // same name as a direct or virtual base class of the class, a 1810 // mem-initializer-id naming the member or base class and composed 1811 // of a single identifier refers to the class member. A 1812 // mem-initializer-id for the hidden base class may be specified 1813 // using a qualified name. ] 1814 if (!SS.getScopeRep() && !TemplateTypeTy) { 1815 // Look for a member, first. 1816 DeclContext::lookup_result Result 1817 = ClassDecl->lookup(MemberOrBase); 1818 if (Result.first != Result.second) { 1819 ValueDecl *Member; 1820 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1821 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1822 if (EllipsisLoc.isValid()) 1823 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1824 << MemberOrBase 1825 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1826 1827 return BuildMemberInitializer(Member, Init, IdLoc); 1828 } 1829 } 1830 } 1831 // It didn't name a member, so see if it names a class. 1832 QualType BaseType; 1833 TypeSourceInfo *TInfo = 0; 1834 1835 if (TemplateTypeTy) { 1836 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1837 } else if (DS.getTypeSpecType() == TST_decltype) { 1838 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1839 } else { 1840 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1841 LookupParsedName(R, S, &SS); 1842 1843 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1844 if (!TyD) { 1845 if (R.isAmbiguous()) return true; 1846 1847 // We don't want access-control diagnostics here. 1848 R.suppressDiagnostics(); 1849 1850 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1851 bool NotUnknownSpecialization = false; 1852 DeclContext *DC = computeDeclContext(SS, false); 1853 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1854 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1855 1856 if (!NotUnknownSpecialization) { 1857 // When the scope specifier can refer to a member of an unknown 1858 // specialization, we take it as a type name. 1859 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1860 SS.getWithLocInContext(Context), 1861 *MemberOrBase, IdLoc); 1862 if (BaseType.isNull()) 1863 return true; 1864 1865 R.clear(); 1866 R.setLookupName(MemberOrBase); 1867 } 1868 } 1869 1870 // If no results were found, try to correct typos. 1871 TypoCorrection Corr; 1872 MemInitializerValidatorCCC Validator(ClassDecl); 1873 if (R.empty() && BaseType.isNull() && 1874 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1875 Validator, ClassDecl))) { 1876 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1877 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1878 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1879 // We have found a non-static data member with a similar 1880 // name to what was typed; complain and initialize that 1881 // member. 1882 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1883 << MemberOrBase << true << CorrectedQuotedStr 1884 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1885 Diag(Member->getLocation(), diag::note_previous_decl) 1886 << CorrectedQuotedStr; 1887 1888 return BuildMemberInitializer(Member, Init, IdLoc); 1889 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1890 const CXXBaseSpecifier *DirectBaseSpec; 1891 const CXXBaseSpecifier *VirtualBaseSpec; 1892 if (FindBaseInitializer(*this, ClassDecl, 1893 Context.getTypeDeclType(Type), 1894 DirectBaseSpec, VirtualBaseSpec)) { 1895 // We have found a direct or virtual base class with a 1896 // similar name to what was typed; complain and initialize 1897 // that base class. 1898 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1899 << MemberOrBase << false << CorrectedQuotedStr 1900 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1901 1902 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1903 : VirtualBaseSpec; 1904 Diag(BaseSpec->getSourceRange().getBegin(), 1905 diag::note_base_class_specified_here) 1906 << BaseSpec->getType() 1907 << BaseSpec->getSourceRange(); 1908 1909 TyD = Type; 1910 } 1911 } 1912 } 1913 1914 if (!TyD && BaseType.isNull()) { 1915 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1916 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1917 return true; 1918 } 1919 } 1920 1921 if (BaseType.isNull()) { 1922 BaseType = Context.getTypeDeclType(TyD); 1923 if (SS.isSet()) { 1924 NestedNameSpecifier *Qualifier = 1925 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1926 1927 // FIXME: preserve source range information 1928 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1929 } 1930 } 1931 } 1932 1933 if (!TInfo) 1934 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1935 1936 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 1937} 1938 1939/// Checks a member initializer expression for cases where reference (or 1940/// pointer) members are bound to by-value parameters (or their addresses). 1941static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1942 Expr *Init, 1943 SourceLocation IdLoc) { 1944 QualType MemberTy = Member->getType(); 1945 1946 // We only handle pointers and references currently. 1947 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1948 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1949 return; 1950 1951 const bool IsPointer = MemberTy->isPointerType(); 1952 if (IsPointer) { 1953 if (const UnaryOperator *Op 1954 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1955 // The only case we're worried about with pointers requires taking the 1956 // address. 1957 if (Op->getOpcode() != UO_AddrOf) 1958 return; 1959 1960 Init = Op->getSubExpr(); 1961 } else { 1962 // We only handle address-of expression initializers for pointers. 1963 return; 1964 } 1965 } 1966 1967 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1968 // Taking the address of a temporary will be diagnosed as a hard error. 1969 if (IsPointer) 1970 return; 1971 1972 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1973 << Member << Init->getSourceRange(); 1974 } else if (const DeclRefExpr *DRE 1975 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1976 // We only warn when referring to a non-reference parameter declaration. 1977 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1978 if (!Parameter || Parameter->getType()->isReferenceType()) 1979 return; 1980 1981 S.Diag(Init->getExprLoc(), 1982 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1983 : diag::warn_bind_ref_member_to_parameter) 1984 << Member << Parameter << Init->getSourceRange(); 1985 } else { 1986 // Other initializers are fine. 1987 return; 1988 } 1989 1990 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1991 << (unsigned)IsPointer; 1992} 1993 1994/// Checks an initializer expression for use of uninitialized fields, such as 1995/// containing the field that is being initialized. Returns true if there is an 1996/// uninitialized field was used an updates the SourceLocation parameter; false 1997/// otherwise. 1998static bool InitExprContainsUninitializedFields(const Stmt *S, 1999 const ValueDecl *LhsField, 2000 SourceLocation *L) { 2001 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 2002 2003 if (isa<CallExpr>(S)) { 2004 // Do not descend into function calls or constructors, as the use 2005 // of an uninitialized field may be valid. One would have to inspect 2006 // the contents of the function/ctor to determine if it is safe or not. 2007 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 2008 // may be safe, depending on what the function/ctor does. 2009 return false; 2010 } 2011 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 2012 const NamedDecl *RhsField = ME->getMemberDecl(); 2013 2014 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 2015 // The member expression points to a static data member. 2016 assert(VD->isStaticDataMember() && 2017 "Member points to non-static data member!"); 2018 (void)VD; 2019 return false; 2020 } 2021 2022 if (isa<EnumConstantDecl>(RhsField)) { 2023 // The member expression points to an enum. 2024 return false; 2025 } 2026 2027 if (RhsField == LhsField) { 2028 // Initializing a field with itself. Throw a warning. 2029 // But wait; there are exceptions! 2030 // Exception #1: The field may not belong to this record. 2031 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2032 const Expr *base = ME->getBase(); 2033 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2034 // Even though the field matches, it does not belong to this record. 2035 return false; 2036 } 2037 // None of the exceptions triggered; return true to indicate an 2038 // uninitialized field was used. 2039 *L = ME->getMemberLoc(); 2040 return true; 2041 } 2042 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2043 // sizeof/alignof doesn't reference contents, do not warn. 2044 return false; 2045 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2046 // address-of doesn't reference contents (the pointer may be dereferenced 2047 // in the same expression but it would be rare; and weird). 2048 if (UOE->getOpcode() == UO_AddrOf) 2049 return false; 2050 } 2051 for (Stmt::const_child_range it = S->children(); it; ++it) { 2052 if (!*it) { 2053 // An expression such as 'member(arg ?: "")' may trigger this. 2054 continue; 2055 } 2056 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2057 return true; 2058 } 2059 return false; 2060} 2061 2062MemInitResult 2063Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2064 SourceLocation IdLoc) { 2065 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2066 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2067 assert((DirectMember || IndirectMember) && 2068 "Member must be a FieldDecl or IndirectFieldDecl"); 2069 2070 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2071 return true; 2072 2073 if (Member->isInvalidDecl()) 2074 return true; 2075 2076 // Diagnose value-uses of fields to initialize themselves, e.g. 2077 // foo(foo) 2078 // where foo is not also a parameter to the constructor. 2079 // TODO: implement -Wuninitialized and fold this into that framework. 2080 Expr **Args; 2081 unsigned NumArgs; 2082 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2083 Args = ParenList->getExprs(); 2084 NumArgs = ParenList->getNumExprs(); 2085 } else { 2086 InitListExpr *InitList = cast<InitListExpr>(Init); 2087 Args = InitList->getInits(); 2088 NumArgs = InitList->getNumInits(); 2089 } 2090 for (unsigned i = 0; i < NumArgs; ++i) { 2091 SourceLocation L; 2092 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 2093 // FIXME: Return true in the case when other fields are used before being 2094 // uninitialized. For example, let this field be the i'th field. When 2095 // initializing the i'th field, throw a warning if any of the >= i'th 2096 // fields are used, as they are not yet initialized. 2097 // Right now we are only handling the case where the i'th field uses 2098 // itself in its initializer. 2099 Diag(L, diag::warn_field_is_uninit); 2100 } 2101 } 2102 2103 SourceRange InitRange = Init->getSourceRange(); 2104 2105 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2106 // Can't check initialization for a member of dependent type or when 2107 // any of the arguments are type-dependent expressions. 2108 DiscardCleanupsInEvaluationContext(); 2109 } else { 2110 bool InitList = false; 2111 if (isa<InitListExpr>(Init)) { 2112 InitList = true; 2113 Args = &Init; 2114 NumArgs = 1; 2115 } 2116 2117 // Initialize the member. 2118 InitializedEntity MemberEntity = 2119 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2120 : InitializedEntity::InitializeMember(IndirectMember, 0); 2121 InitializationKind Kind = 2122 InitList ? InitializationKind::CreateDirectList(IdLoc) 2123 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2124 InitRange.getEnd()); 2125 2126 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2127 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2128 MultiExprArg(*this, Args, NumArgs), 2129 0); 2130 if (MemberInit.isInvalid()) 2131 return true; 2132 2133 CheckImplicitConversions(MemberInit.get(), 2134 InitRange.getBegin()); 2135 2136 // C++0x [class.base.init]p7: 2137 // The initialization of each base and member constitutes a 2138 // full-expression. 2139 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2140 if (MemberInit.isInvalid()) 2141 return true; 2142 2143 // If we are in a dependent context, template instantiation will 2144 // perform this type-checking again. Just save the arguments that we 2145 // received. 2146 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2147 // of the information that we have about the member 2148 // initializer. However, deconstructing the ASTs is a dicey process, 2149 // and this approach is far more likely to get the corner cases right. 2150 if (CurContext->isDependentContext()) { 2151 // The existing Init will do fine. 2152 } else { 2153 Init = MemberInit.get(); 2154 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2155 } 2156 } 2157 2158 if (DirectMember) { 2159 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2160 InitRange.getBegin(), Init, 2161 InitRange.getEnd()); 2162 } else { 2163 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2164 InitRange.getBegin(), Init, 2165 InitRange.getEnd()); 2166 } 2167} 2168 2169MemInitResult 2170Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2171 CXXRecordDecl *ClassDecl) { 2172 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2173 if (!LangOpts.CPlusPlus0x) 2174 return Diag(NameLoc, diag::err_delegating_ctor) 2175 << TInfo->getTypeLoc().getLocalSourceRange(); 2176 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2177 2178 bool InitList = true; 2179 Expr **Args = &Init; 2180 unsigned NumArgs = 1; 2181 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2182 InitList = false; 2183 Args = ParenList->getExprs(); 2184 NumArgs = ParenList->getNumExprs(); 2185 } 2186 2187 SourceRange InitRange = Init->getSourceRange(); 2188 // Initialize the object. 2189 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2190 QualType(ClassDecl->getTypeForDecl(), 0)); 2191 InitializationKind Kind = 2192 InitList ? InitializationKind::CreateDirectList(NameLoc) 2193 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2194 InitRange.getEnd()); 2195 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2196 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2197 MultiExprArg(*this, Args,NumArgs), 2198 0); 2199 if (DelegationInit.isInvalid()) 2200 return true; 2201 2202 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2203 "Delegating constructor with no target?"); 2204 2205 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2206 2207 // C++0x [class.base.init]p7: 2208 // The initialization of each base and member constitutes a 2209 // full-expression. 2210 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2211 if (DelegationInit.isInvalid()) 2212 return true; 2213 2214 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2215 DelegationInit.takeAs<Expr>(), 2216 InitRange.getEnd()); 2217} 2218 2219MemInitResult 2220Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2221 Expr *Init, CXXRecordDecl *ClassDecl, 2222 SourceLocation EllipsisLoc) { 2223 SourceLocation BaseLoc 2224 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2225 2226 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2227 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2228 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2229 2230 // C++ [class.base.init]p2: 2231 // [...] Unless the mem-initializer-id names a nonstatic data 2232 // member of the constructor's class or a direct or virtual base 2233 // of that class, the mem-initializer is ill-formed. A 2234 // mem-initializer-list can initialize a base class using any 2235 // name that denotes that base class type. 2236 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2237 2238 SourceRange InitRange = Init->getSourceRange(); 2239 if (EllipsisLoc.isValid()) { 2240 // This is a pack expansion. 2241 if (!BaseType->containsUnexpandedParameterPack()) { 2242 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2243 << SourceRange(BaseLoc, InitRange.getEnd()); 2244 2245 EllipsisLoc = SourceLocation(); 2246 } 2247 } else { 2248 // Check for any unexpanded parameter packs. 2249 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2250 return true; 2251 2252 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2253 return true; 2254 } 2255 2256 // Check for direct and virtual base classes. 2257 const CXXBaseSpecifier *DirectBaseSpec = 0; 2258 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2259 if (!Dependent) { 2260 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2261 BaseType)) 2262 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2263 2264 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2265 VirtualBaseSpec); 2266 2267 // C++ [base.class.init]p2: 2268 // Unless the mem-initializer-id names a nonstatic data member of the 2269 // constructor's class or a direct or virtual base of that class, the 2270 // mem-initializer is ill-formed. 2271 if (!DirectBaseSpec && !VirtualBaseSpec) { 2272 // If the class has any dependent bases, then it's possible that 2273 // one of those types will resolve to the same type as 2274 // BaseType. Therefore, just treat this as a dependent base 2275 // class initialization. FIXME: Should we try to check the 2276 // initialization anyway? It seems odd. 2277 if (ClassDecl->hasAnyDependentBases()) 2278 Dependent = true; 2279 else 2280 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2281 << BaseType << Context.getTypeDeclType(ClassDecl) 2282 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2283 } 2284 } 2285 2286 if (Dependent) { 2287 DiscardCleanupsInEvaluationContext(); 2288 2289 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2290 /*IsVirtual=*/false, 2291 InitRange.getBegin(), Init, 2292 InitRange.getEnd(), EllipsisLoc); 2293 } 2294 2295 // C++ [base.class.init]p2: 2296 // If a mem-initializer-id is ambiguous because it designates both 2297 // a direct non-virtual base class and an inherited virtual base 2298 // class, the mem-initializer is ill-formed. 2299 if (DirectBaseSpec && VirtualBaseSpec) 2300 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2301 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2302 2303 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2304 if (!BaseSpec) 2305 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2306 2307 // Initialize the base. 2308 bool InitList = true; 2309 Expr **Args = &Init; 2310 unsigned NumArgs = 1; 2311 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2312 InitList = false; 2313 Args = ParenList->getExprs(); 2314 NumArgs = ParenList->getNumExprs(); 2315 } 2316 2317 InitializedEntity BaseEntity = 2318 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2319 InitializationKind Kind = 2320 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2321 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2322 InitRange.getEnd()); 2323 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2324 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2325 MultiExprArg(*this, Args, NumArgs), 2326 0); 2327 if (BaseInit.isInvalid()) 2328 return true; 2329 2330 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2331 2332 // C++0x [class.base.init]p7: 2333 // The initialization of each base and member constitutes a 2334 // full-expression. 2335 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2336 if (BaseInit.isInvalid()) 2337 return true; 2338 2339 // If we are in a dependent context, template instantiation will 2340 // perform this type-checking again. Just save the arguments that we 2341 // received in a ParenListExpr. 2342 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2343 // of the information that we have about the base 2344 // initializer. However, deconstructing the ASTs is a dicey process, 2345 // and this approach is far more likely to get the corner cases right. 2346 if (CurContext->isDependentContext()) 2347 BaseInit = Owned(Init); 2348 2349 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2350 BaseSpec->isVirtual(), 2351 InitRange.getBegin(), 2352 BaseInit.takeAs<Expr>(), 2353 InitRange.getEnd(), EllipsisLoc); 2354} 2355 2356// Create a static_cast\<T&&>(expr). 2357static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2358 QualType ExprType = E->getType(); 2359 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2360 SourceLocation ExprLoc = E->getLocStart(); 2361 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2362 TargetType, ExprLoc); 2363 2364 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2365 SourceRange(ExprLoc, ExprLoc), 2366 E->getSourceRange()).take(); 2367} 2368 2369/// ImplicitInitializerKind - How an implicit base or member initializer should 2370/// initialize its base or member. 2371enum ImplicitInitializerKind { 2372 IIK_Default, 2373 IIK_Copy, 2374 IIK_Move 2375}; 2376 2377static bool 2378BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2379 ImplicitInitializerKind ImplicitInitKind, 2380 CXXBaseSpecifier *BaseSpec, 2381 bool IsInheritedVirtualBase, 2382 CXXCtorInitializer *&CXXBaseInit) { 2383 InitializedEntity InitEntity 2384 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2385 IsInheritedVirtualBase); 2386 2387 ExprResult BaseInit; 2388 2389 switch (ImplicitInitKind) { 2390 case IIK_Default: { 2391 InitializationKind InitKind 2392 = InitializationKind::CreateDefault(Constructor->getLocation()); 2393 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2394 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2395 MultiExprArg(SemaRef, 0, 0)); 2396 break; 2397 } 2398 2399 case IIK_Move: 2400 case IIK_Copy: { 2401 bool Moving = ImplicitInitKind == IIK_Move; 2402 ParmVarDecl *Param = Constructor->getParamDecl(0); 2403 QualType ParamType = Param->getType().getNonReferenceType(); 2404 2405 Expr *CopyCtorArg = 2406 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2407 SourceLocation(), Param, 2408 Constructor->getLocation(), ParamType, 2409 VK_LValue, 0); 2410 2411 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2412 2413 // Cast to the base class to avoid ambiguities. 2414 QualType ArgTy = 2415 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2416 ParamType.getQualifiers()); 2417 2418 if (Moving) { 2419 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2420 } 2421 2422 CXXCastPath BasePath; 2423 BasePath.push_back(BaseSpec); 2424 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2425 CK_UncheckedDerivedToBase, 2426 Moving ? VK_XValue : VK_LValue, 2427 &BasePath).take(); 2428 2429 InitializationKind InitKind 2430 = InitializationKind::CreateDirect(Constructor->getLocation(), 2431 SourceLocation(), SourceLocation()); 2432 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2433 &CopyCtorArg, 1); 2434 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2435 MultiExprArg(&CopyCtorArg, 1)); 2436 break; 2437 } 2438 } 2439 2440 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2441 if (BaseInit.isInvalid()) 2442 return true; 2443 2444 CXXBaseInit = 2445 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2446 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2447 SourceLocation()), 2448 BaseSpec->isVirtual(), 2449 SourceLocation(), 2450 BaseInit.takeAs<Expr>(), 2451 SourceLocation(), 2452 SourceLocation()); 2453 2454 return false; 2455} 2456 2457static bool RefersToRValueRef(Expr *MemRef) { 2458 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2459 return Referenced->getType()->isRValueReferenceType(); 2460} 2461 2462static bool 2463BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2464 ImplicitInitializerKind ImplicitInitKind, 2465 FieldDecl *Field, IndirectFieldDecl *Indirect, 2466 CXXCtorInitializer *&CXXMemberInit) { 2467 if (Field->isInvalidDecl()) 2468 return true; 2469 2470 SourceLocation Loc = Constructor->getLocation(); 2471 2472 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2473 bool Moving = ImplicitInitKind == IIK_Move; 2474 ParmVarDecl *Param = Constructor->getParamDecl(0); 2475 QualType ParamType = Param->getType().getNonReferenceType(); 2476 2477 // Suppress copying zero-width bitfields. 2478 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2479 return false; 2480 2481 Expr *MemberExprBase = 2482 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2483 SourceLocation(), Param, 2484 Loc, ParamType, VK_LValue, 0); 2485 2486 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2487 2488 if (Moving) { 2489 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2490 } 2491 2492 // Build a reference to this field within the parameter. 2493 CXXScopeSpec SS; 2494 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2495 Sema::LookupMemberName); 2496 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2497 : cast<ValueDecl>(Field), AS_public); 2498 MemberLookup.resolveKind(); 2499 ExprResult CtorArg 2500 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2501 ParamType, Loc, 2502 /*IsArrow=*/false, 2503 SS, 2504 /*TemplateKWLoc=*/SourceLocation(), 2505 /*FirstQualifierInScope=*/0, 2506 MemberLookup, 2507 /*TemplateArgs=*/0); 2508 if (CtorArg.isInvalid()) 2509 return true; 2510 2511 // C++11 [class.copy]p15: 2512 // - if a member m has rvalue reference type T&&, it is direct-initialized 2513 // with static_cast<T&&>(x.m); 2514 if (RefersToRValueRef(CtorArg.get())) { 2515 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2516 } 2517 2518 // When the field we are copying is an array, create index variables for 2519 // each dimension of the array. We use these index variables to subscript 2520 // the source array, and other clients (e.g., CodeGen) will perform the 2521 // necessary iteration with these index variables. 2522 SmallVector<VarDecl *, 4> IndexVariables; 2523 QualType BaseType = Field->getType(); 2524 QualType SizeType = SemaRef.Context.getSizeType(); 2525 bool InitializingArray = false; 2526 while (const ConstantArrayType *Array 2527 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2528 InitializingArray = true; 2529 // Create the iteration variable for this array index. 2530 IdentifierInfo *IterationVarName = 0; 2531 { 2532 SmallString<8> Str; 2533 llvm::raw_svector_ostream OS(Str); 2534 OS << "__i" << IndexVariables.size(); 2535 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2536 } 2537 VarDecl *IterationVar 2538 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2539 IterationVarName, SizeType, 2540 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2541 SC_None, SC_None); 2542 IndexVariables.push_back(IterationVar); 2543 2544 // Create a reference to the iteration variable. 2545 ExprResult IterationVarRef 2546 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2547 assert(!IterationVarRef.isInvalid() && 2548 "Reference to invented variable cannot fail!"); 2549 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2550 assert(!IterationVarRef.isInvalid() && 2551 "Conversion of invented variable cannot fail!"); 2552 2553 // Subscript the array with this iteration variable. 2554 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2555 IterationVarRef.take(), 2556 Loc); 2557 if (CtorArg.isInvalid()) 2558 return true; 2559 2560 BaseType = Array->getElementType(); 2561 } 2562 2563 // The array subscript expression is an lvalue, which is wrong for moving. 2564 if (Moving && InitializingArray) 2565 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2566 2567 // Construct the entity that we will be initializing. For an array, this 2568 // will be first element in the array, which may require several levels 2569 // of array-subscript entities. 2570 SmallVector<InitializedEntity, 4> Entities; 2571 Entities.reserve(1 + IndexVariables.size()); 2572 if (Indirect) 2573 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2574 else 2575 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2576 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2577 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2578 0, 2579 Entities.back())); 2580 2581 // Direct-initialize to use the copy constructor. 2582 InitializationKind InitKind = 2583 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2584 2585 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2586 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2587 &CtorArgE, 1); 2588 2589 ExprResult MemberInit 2590 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2591 MultiExprArg(&CtorArgE, 1)); 2592 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2593 if (MemberInit.isInvalid()) 2594 return true; 2595 2596 if (Indirect) { 2597 assert(IndexVariables.size() == 0 && 2598 "Indirect field improperly initialized"); 2599 CXXMemberInit 2600 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2601 Loc, Loc, 2602 MemberInit.takeAs<Expr>(), 2603 Loc); 2604 } else 2605 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2606 Loc, MemberInit.takeAs<Expr>(), 2607 Loc, 2608 IndexVariables.data(), 2609 IndexVariables.size()); 2610 return false; 2611 } 2612 2613 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2614 2615 QualType FieldBaseElementType = 2616 SemaRef.Context.getBaseElementType(Field->getType()); 2617 2618 if (FieldBaseElementType->isRecordType()) { 2619 InitializedEntity InitEntity 2620 = Indirect? InitializedEntity::InitializeMember(Indirect) 2621 : InitializedEntity::InitializeMember(Field); 2622 InitializationKind InitKind = 2623 InitializationKind::CreateDefault(Loc); 2624 2625 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2626 ExprResult MemberInit = 2627 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2628 2629 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2630 if (MemberInit.isInvalid()) 2631 return true; 2632 2633 if (Indirect) 2634 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2635 Indirect, Loc, 2636 Loc, 2637 MemberInit.get(), 2638 Loc); 2639 else 2640 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2641 Field, Loc, Loc, 2642 MemberInit.get(), 2643 Loc); 2644 return false; 2645 } 2646 2647 if (!Field->getParent()->isUnion()) { 2648 if (FieldBaseElementType->isReferenceType()) { 2649 SemaRef.Diag(Constructor->getLocation(), 2650 diag::err_uninitialized_member_in_ctor) 2651 << (int)Constructor->isImplicit() 2652 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2653 << 0 << Field->getDeclName(); 2654 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2655 return true; 2656 } 2657 2658 if (FieldBaseElementType.isConstQualified()) { 2659 SemaRef.Diag(Constructor->getLocation(), 2660 diag::err_uninitialized_member_in_ctor) 2661 << (int)Constructor->isImplicit() 2662 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2663 << 1 << Field->getDeclName(); 2664 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2665 return true; 2666 } 2667 } 2668 2669 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2670 FieldBaseElementType->isObjCRetainableType() && 2671 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2672 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2673 // Instant objects: 2674 // Default-initialize Objective-C pointers to NULL. 2675 CXXMemberInit 2676 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2677 Loc, Loc, 2678 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2679 Loc); 2680 return false; 2681 } 2682 2683 // Nothing to initialize. 2684 CXXMemberInit = 0; 2685 return false; 2686} 2687 2688namespace { 2689struct BaseAndFieldInfo { 2690 Sema &S; 2691 CXXConstructorDecl *Ctor; 2692 bool AnyErrorsInInits; 2693 ImplicitInitializerKind IIK; 2694 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2695 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2696 2697 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2698 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2699 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2700 if (Generated && Ctor->isCopyConstructor()) 2701 IIK = IIK_Copy; 2702 else if (Generated && Ctor->isMoveConstructor()) 2703 IIK = IIK_Move; 2704 else 2705 IIK = IIK_Default; 2706 } 2707 2708 bool isImplicitCopyOrMove() const { 2709 switch (IIK) { 2710 case IIK_Copy: 2711 case IIK_Move: 2712 return true; 2713 2714 case IIK_Default: 2715 return false; 2716 } 2717 2718 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2719 } 2720}; 2721} 2722 2723/// \brief Determine whether the given indirect field declaration is somewhere 2724/// within an anonymous union. 2725static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2726 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2727 CEnd = F->chain_end(); 2728 C != CEnd; ++C) 2729 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2730 if (Record->isUnion()) 2731 return true; 2732 2733 return false; 2734} 2735 2736/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2737/// array type. 2738static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2739 if (T->isIncompleteArrayType()) 2740 return true; 2741 2742 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2743 if (!ArrayT->getSize()) 2744 return true; 2745 2746 T = ArrayT->getElementType(); 2747 } 2748 2749 return false; 2750} 2751 2752static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2753 FieldDecl *Field, 2754 IndirectFieldDecl *Indirect = 0) { 2755 2756 // Overwhelmingly common case: we have a direct initializer for this field. 2757 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2758 Info.AllToInit.push_back(Init); 2759 return false; 2760 } 2761 2762 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2763 // has a brace-or-equal-initializer, the entity is initialized as specified 2764 // in [dcl.init]. 2765 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2766 CXXCtorInitializer *Init; 2767 if (Indirect) 2768 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2769 SourceLocation(), 2770 SourceLocation(), 0, 2771 SourceLocation()); 2772 else 2773 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2774 SourceLocation(), 2775 SourceLocation(), 0, 2776 SourceLocation()); 2777 Info.AllToInit.push_back(Init); 2778 return false; 2779 } 2780 2781 // Don't build an implicit initializer for union members if none was 2782 // explicitly specified. 2783 if (Field->getParent()->isUnion() || 2784 (Indirect && isWithinAnonymousUnion(Indirect))) 2785 return false; 2786 2787 // Don't initialize incomplete or zero-length arrays. 2788 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2789 return false; 2790 2791 // Don't try to build an implicit initializer if there were semantic 2792 // errors in any of the initializers (and therefore we might be 2793 // missing some that the user actually wrote). 2794 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2795 return false; 2796 2797 CXXCtorInitializer *Init = 0; 2798 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2799 Indirect, Init)) 2800 return true; 2801 2802 if (Init) 2803 Info.AllToInit.push_back(Init); 2804 2805 return false; 2806} 2807 2808bool 2809Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2810 CXXCtorInitializer *Initializer) { 2811 assert(Initializer->isDelegatingInitializer()); 2812 Constructor->setNumCtorInitializers(1); 2813 CXXCtorInitializer **initializer = 2814 new (Context) CXXCtorInitializer*[1]; 2815 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2816 Constructor->setCtorInitializers(initializer); 2817 2818 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2819 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2820 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2821 } 2822 2823 DelegatingCtorDecls.push_back(Constructor); 2824 2825 return false; 2826} 2827 2828bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2829 CXXCtorInitializer **Initializers, 2830 unsigned NumInitializers, 2831 bool AnyErrors) { 2832 if (Constructor->isDependentContext()) { 2833 // Just store the initializers as written, they will be checked during 2834 // instantiation. 2835 if (NumInitializers > 0) { 2836 Constructor->setNumCtorInitializers(NumInitializers); 2837 CXXCtorInitializer **baseOrMemberInitializers = 2838 new (Context) CXXCtorInitializer*[NumInitializers]; 2839 memcpy(baseOrMemberInitializers, Initializers, 2840 NumInitializers * sizeof(CXXCtorInitializer*)); 2841 Constructor->setCtorInitializers(baseOrMemberInitializers); 2842 } 2843 2844 return false; 2845 } 2846 2847 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2848 2849 // We need to build the initializer AST according to order of construction 2850 // and not what user specified in the Initializers list. 2851 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2852 if (!ClassDecl) 2853 return true; 2854 2855 bool HadError = false; 2856 2857 for (unsigned i = 0; i < NumInitializers; i++) { 2858 CXXCtorInitializer *Member = Initializers[i]; 2859 2860 if (Member->isBaseInitializer()) 2861 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2862 else 2863 Info.AllBaseFields[Member->getAnyMember()] = Member; 2864 } 2865 2866 // Keep track of the direct virtual bases. 2867 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2868 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2869 E = ClassDecl->bases_end(); I != E; ++I) { 2870 if (I->isVirtual()) 2871 DirectVBases.insert(I); 2872 } 2873 2874 // Push virtual bases before others. 2875 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2876 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2877 2878 if (CXXCtorInitializer *Value 2879 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2880 Info.AllToInit.push_back(Value); 2881 } else if (!AnyErrors) { 2882 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2883 CXXCtorInitializer *CXXBaseInit; 2884 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2885 VBase, IsInheritedVirtualBase, 2886 CXXBaseInit)) { 2887 HadError = true; 2888 continue; 2889 } 2890 2891 Info.AllToInit.push_back(CXXBaseInit); 2892 } 2893 } 2894 2895 // Non-virtual bases. 2896 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2897 E = ClassDecl->bases_end(); Base != E; ++Base) { 2898 // Virtuals are in the virtual base list and already constructed. 2899 if (Base->isVirtual()) 2900 continue; 2901 2902 if (CXXCtorInitializer *Value 2903 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2904 Info.AllToInit.push_back(Value); 2905 } else if (!AnyErrors) { 2906 CXXCtorInitializer *CXXBaseInit; 2907 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2908 Base, /*IsInheritedVirtualBase=*/false, 2909 CXXBaseInit)) { 2910 HadError = true; 2911 continue; 2912 } 2913 2914 Info.AllToInit.push_back(CXXBaseInit); 2915 } 2916 } 2917 2918 // Fields. 2919 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2920 MemEnd = ClassDecl->decls_end(); 2921 Mem != MemEnd; ++Mem) { 2922 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2923 // C++ [class.bit]p2: 2924 // A declaration for a bit-field that omits the identifier declares an 2925 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2926 // initialized. 2927 if (F->isUnnamedBitfield()) 2928 continue; 2929 2930 // If we're not generating the implicit copy/move constructor, then we'll 2931 // handle anonymous struct/union fields based on their individual 2932 // indirect fields. 2933 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2934 continue; 2935 2936 if (CollectFieldInitializer(*this, Info, F)) 2937 HadError = true; 2938 continue; 2939 } 2940 2941 // Beyond this point, we only consider default initialization. 2942 if (Info.IIK != IIK_Default) 2943 continue; 2944 2945 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2946 if (F->getType()->isIncompleteArrayType()) { 2947 assert(ClassDecl->hasFlexibleArrayMember() && 2948 "Incomplete array type is not valid"); 2949 continue; 2950 } 2951 2952 // Initialize each field of an anonymous struct individually. 2953 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2954 HadError = true; 2955 2956 continue; 2957 } 2958 } 2959 2960 NumInitializers = Info.AllToInit.size(); 2961 if (NumInitializers > 0) { 2962 Constructor->setNumCtorInitializers(NumInitializers); 2963 CXXCtorInitializer **baseOrMemberInitializers = 2964 new (Context) CXXCtorInitializer*[NumInitializers]; 2965 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2966 NumInitializers * sizeof(CXXCtorInitializer*)); 2967 Constructor->setCtorInitializers(baseOrMemberInitializers); 2968 2969 // Constructors implicitly reference the base and member 2970 // destructors. 2971 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2972 Constructor->getParent()); 2973 } 2974 2975 return HadError; 2976} 2977 2978static void *GetKeyForTopLevelField(FieldDecl *Field) { 2979 // For anonymous unions, use the class declaration as the key. 2980 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2981 if (RT->getDecl()->isAnonymousStructOrUnion()) 2982 return static_cast<void *>(RT->getDecl()); 2983 } 2984 return static_cast<void *>(Field); 2985} 2986 2987static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2988 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2989} 2990 2991static void *GetKeyForMember(ASTContext &Context, 2992 CXXCtorInitializer *Member) { 2993 if (!Member->isAnyMemberInitializer()) 2994 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2995 2996 // For fields injected into the class via declaration of an anonymous union, 2997 // use its anonymous union class declaration as the unique key. 2998 FieldDecl *Field = Member->getAnyMember(); 2999 3000 // If the field is a member of an anonymous struct or union, our key 3001 // is the anonymous record decl that's a direct child of the class. 3002 RecordDecl *RD = Field->getParent(); 3003 if (RD->isAnonymousStructOrUnion()) { 3004 while (true) { 3005 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3006 if (Parent->isAnonymousStructOrUnion()) 3007 RD = Parent; 3008 else 3009 break; 3010 } 3011 3012 return static_cast<void *>(RD); 3013 } 3014 3015 return static_cast<void *>(Field); 3016} 3017 3018static void 3019DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3020 const CXXConstructorDecl *Constructor, 3021 CXXCtorInitializer **Inits, 3022 unsigned NumInits) { 3023 if (Constructor->getDeclContext()->isDependentContext()) 3024 return; 3025 3026 // Don't check initializers order unless the warning is enabled at the 3027 // location of at least one initializer. 3028 bool ShouldCheckOrder = false; 3029 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3030 CXXCtorInitializer *Init = Inits[InitIndex]; 3031 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3032 Init->getSourceLocation()) 3033 != DiagnosticsEngine::Ignored) { 3034 ShouldCheckOrder = true; 3035 break; 3036 } 3037 } 3038 if (!ShouldCheckOrder) 3039 return; 3040 3041 // Build the list of bases and members in the order that they'll 3042 // actually be initialized. The explicit initializers should be in 3043 // this same order but may be missing things. 3044 SmallVector<const void*, 32> IdealInitKeys; 3045 3046 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3047 3048 // 1. Virtual bases. 3049 for (CXXRecordDecl::base_class_const_iterator VBase = 3050 ClassDecl->vbases_begin(), 3051 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3052 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3053 3054 // 2. Non-virtual bases. 3055 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3056 E = ClassDecl->bases_end(); Base != E; ++Base) { 3057 if (Base->isVirtual()) 3058 continue; 3059 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3060 } 3061 3062 // 3. Direct fields. 3063 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3064 E = ClassDecl->field_end(); Field != E; ++Field) { 3065 if (Field->isUnnamedBitfield()) 3066 continue; 3067 3068 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3069 } 3070 3071 unsigned NumIdealInits = IdealInitKeys.size(); 3072 unsigned IdealIndex = 0; 3073 3074 CXXCtorInitializer *PrevInit = 0; 3075 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3076 CXXCtorInitializer *Init = Inits[InitIndex]; 3077 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3078 3079 // Scan forward to try to find this initializer in the idealized 3080 // initializers list. 3081 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3082 if (InitKey == IdealInitKeys[IdealIndex]) 3083 break; 3084 3085 // If we didn't find this initializer, it must be because we 3086 // scanned past it on a previous iteration. That can only 3087 // happen if we're out of order; emit a warning. 3088 if (IdealIndex == NumIdealInits && PrevInit) { 3089 Sema::SemaDiagnosticBuilder D = 3090 SemaRef.Diag(PrevInit->getSourceLocation(), 3091 diag::warn_initializer_out_of_order); 3092 3093 if (PrevInit->isAnyMemberInitializer()) 3094 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3095 else 3096 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3097 3098 if (Init->isAnyMemberInitializer()) 3099 D << 0 << Init->getAnyMember()->getDeclName(); 3100 else 3101 D << 1 << Init->getTypeSourceInfo()->getType(); 3102 3103 // Move back to the initializer's location in the ideal list. 3104 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3105 if (InitKey == IdealInitKeys[IdealIndex]) 3106 break; 3107 3108 assert(IdealIndex != NumIdealInits && 3109 "initializer not found in initializer list"); 3110 } 3111 3112 PrevInit = Init; 3113 } 3114} 3115 3116namespace { 3117bool CheckRedundantInit(Sema &S, 3118 CXXCtorInitializer *Init, 3119 CXXCtorInitializer *&PrevInit) { 3120 if (!PrevInit) { 3121 PrevInit = Init; 3122 return false; 3123 } 3124 3125 if (FieldDecl *Field = Init->getMember()) 3126 S.Diag(Init->getSourceLocation(), 3127 diag::err_multiple_mem_initialization) 3128 << Field->getDeclName() 3129 << Init->getSourceRange(); 3130 else { 3131 const Type *BaseClass = Init->getBaseClass(); 3132 assert(BaseClass && "neither field nor base"); 3133 S.Diag(Init->getSourceLocation(), 3134 diag::err_multiple_base_initialization) 3135 << QualType(BaseClass, 0) 3136 << Init->getSourceRange(); 3137 } 3138 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3139 << 0 << PrevInit->getSourceRange(); 3140 3141 return true; 3142} 3143 3144typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3145typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3146 3147bool CheckRedundantUnionInit(Sema &S, 3148 CXXCtorInitializer *Init, 3149 RedundantUnionMap &Unions) { 3150 FieldDecl *Field = Init->getAnyMember(); 3151 RecordDecl *Parent = Field->getParent(); 3152 NamedDecl *Child = Field; 3153 3154 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3155 if (Parent->isUnion()) { 3156 UnionEntry &En = Unions[Parent]; 3157 if (En.first && En.first != Child) { 3158 S.Diag(Init->getSourceLocation(), 3159 diag::err_multiple_mem_union_initialization) 3160 << Field->getDeclName() 3161 << Init->getSourceRange(); 3162 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3163 << 0 << En.second->getSourceRange(); 3164 return true; 3165 } 3166 if (!En.first) { 3167 En.first = Child; 3168 En.second = Init; 3169 } 3170 if (!Parent->isAnonymousStructOrUnion()) 3171 return false; 3172 } 3173 3174 Child = Parent; 3175 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3176 } 3177 3178 return false; 3179} 3180} 3181 3182/// ActOnMemInitializers - Handle the member initializers for a constructor. 3183void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3184 SourceLocation ColonLoc, 3185 CXXCtorInitializer **meminits, 3186 unsigned NumMemInits, 3187 bool AnyErrors) { 3188 if (!ConstructorDecl) 3189 return; 3190 3191 AdjustDeclIfTemplate(ConstructorDecl); 3192 3193 CXXConstructorDecl *Constructor 3194 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3195 3196 if (!Constructor) { 3197 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3198 return; 3199 } 3200 3201 CXXCtorInitializer **MemInits = 3202 reinterpret_cast<CXXCtorInitializer **>(meminits); 3203 3204 // Mapping for the duplicate initializers check. 3205 // For member initializers, this is keyed with a FieldDecl*. 3206 // For base initializers, this is keyed with a Type*. 3207 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3208 3209 // Mapping for the inconsistent anonymous-union initializers check. 3210 RedundantUnionMap MemberUnions; 3211 3212 bool HadError = false; 3213 for (unsigned i = 0; i < NumMemInits; i++) { 3214 CXXCtorInitializer *Init = MemInits[i]; 3215 3216 // Set the source order index. 3217 Init->setSourceOrder(i); 3218 3219 if (Init->isAnyMemberInitializer()) { 3220 FieldDecl *Field = Init->getAnyMember(); 3221 if (CheckRedundantInit(*this, Init, Members[Field]) || 3222 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3223 HadError = true; 3224 } else if (Init->isBaseInitializer()) { 3225 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3226 if (CheckRedundantInit(*this, Init, Members[Key])) 3227 HadError = true; 3228 } else { 3229 assert(Init->isDelegatingInitializer()); 3230 // This must be the only initializer 3231 if (i != 0 || NumMemInits > 1) { 3232 Diag(MemInits[0]->getSourceLocation(), 3233 diag::err_delegating_initializer_alone) 3234 << MemInits[0]->getSourceRange(); 3235 HadError = true; 3236 // We will treat this as being the only initializer. 3237 } 3238 SetDelegatingInitializer(Constructor, MemInits[i]); 3239 // Return immediately as the initializer is set. 3240 return; 3241 } 3242 } 3243 3244 if (HadError) 3245 return; 3246 3247 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3248 3249 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3250} 3251 3252void 3253Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3254 CXXRecordDecl *ClassDecl) { 3255 // Ignore dependent contexts. Also ignore unions, since their members never 3256 // have destructors implicitly called. 3257 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3258 return; 3259 3260 // FIXME: all the access-control diagnostics are positioned on the 3261 // field/base declaration. That's probably good; that said, the 3262 // user might reasonably want to know why the destructor is being 3263 // emitted, and we currently don't say. 3264 3265 // Non-static data members. 3266 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3267 E = ClassDecl->field_end(); I != E; ++I) { 3268 FieldDecl *Field = *I; 3269 if (Field->isInvalidDecl()) 3270 continue; 3271 3272 // Don't destroy incomplete or zero-length arrays. 3273 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3274 continue; 3275 3276 QualType FieldType = Context.getBaseElementType(Field->getType()); 3277 3278 const RecordType* RT = FieldType->getAs<RecordType>(); 3279 if (!RT) 3280 continue; 3281 3282 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3283 if (FieldClassDecl->isInvalidDecl()) 3284 continue; 3285 if (FieldClassDecl->hasTrivialDestructor()) 3286 continue; 3287 3288 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3289 assert(Dtor && "No dtor found for FieldClassDecl!"); 3290 CheckDestructorAccess(Field->getLocation(), Dtor, 3291 PDiag(diag::err_access_dtor_field) 3292 << Field->getDeclName() 3293 << FieldType); 3294 3295 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3296 } 3297 3298 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3299 3300 // Bases. 3301 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3302 E = ClassDecl->bases_end(); Base != E; ++Base) { 3303 // Bases are always records in a well-formed non-dependent class. 3304 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3305 3306 // Remember direct virtual bases. 3307 if (Base->isVirtual()) 3308 DirectVirtualBases.insert(RT); 3309 3310 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3311 // If our base class is invalid, we probably can't get its dtor anyway. 3312 if (BaseClassDecl->isInvalidDecl()) 3313 continue; 3314 // Ignore trivial destructors. 3315 if (BaseClassDecl->hasTrivialDestructor()) 3316 continue; 3317 3318 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3319 assert(Dtor && "No dtor found for BaseClassDecl!"); 3320 3321 // FIXME: caret should be on the start of the class name 3322 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3323 PDiag(diag::err_access_dtor_base) 3324 << Base->getType() 3325 << Base->getSourceRange()); 3326 3327 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3328 } 3329 3330 // Virtual bases. 3331 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3332 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3333 3334 // Bases are always records in a well-formed non-dependent class. 3335 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3336 3337 // Ignore direct virtual bases. 3338 if (DirectVirtualBases.count(RT)) 3339 continue; 3340 3341 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3342 // If our base class is invalid, we probably can't get its dtor anyway. 3343 if (BaseClassDecl->isInvalidDecl()) 3344 continue; 3345 // Ignore trivial destructors. 3346 if (BaseClassDecl->hasTrivialDestructor()) 3347 continue; 3348 3349 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3350 assert(Dtor && "No dtor found for BaseClassDecl!"); 3351 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3352 PDiag(diag::err_access_dtor_vbase) 3353 << VBase->getType()); 3354 3355 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3356 } 3357} 3358 3359void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3360 if (!CDtorDecl) 3361 return; 3362 3363 if (CXXConstructorDecl *Constructor 3364 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3365 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3366} 3367 3368bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3369 unsigned DiagID, AbstractDiagSelID SelID) { 3370 if (SelID == -1) 3371 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3372 else 3373 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3374} 3375 3376bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3377 const PartialDiagnostic &PD) { 3378 if (!getLangOptions().CPlusPlus) 3379 return false; 3380 3381 if (const ArrayType *AT = Context.getAsArrayType(T)) 3382 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3383 3384 if (const PointerType *PT = T->getAs<PointerType>()) { 3385 // Find the innermost pointer type. 3386 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3387 PT = T; 3388 3389 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3390 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3391 } 3392 3393 const RecordType *RT = T->getAs<RecordType>(); 3394 if (!RT) 3395 return false; 3396 3397 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3398 3399 // We can't answer whether something is abstract until it has a 3400 // definition. If it's currently being defined, we'll walk back 3401 // over all the declarations when we have a full definition. 3402 const CXXRecordDecl *Def = RD->getDefinition(); 3403 if (!Def || Def->isBeingDefined()) 3404 return false; 3405 3406 if (!RD->isAbstract()) 3407 return false; 3408 3409 Diag(Loc, PD) << RD->getDeclName(); 3410 DiagnoseAbstractType(RD); 3411 3412 return true; 3413} 3414 3415void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3416 // Check if we've already emitted the list of pure virtual functions 3417 // for this class. 3418 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3419 return; 3420 3421 CXXFinalOverriderMap FinalOverriders; 3422 RD->getFinalOverriders(FinalOverriders); 3423 3424 // Keep a set of seen pure methods so we won't diagnose the same method 3425 // more than once. 3426 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3427 3428 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3429 MEnd = FinalOverriders.end(); 3430 M != MEnd; 3431 ++M) { 3432 for (OverridingMethods::iterator SO = M->second.begin(), 3433 SOEnd = M->second.end(); 3434 SO != SOEnd; ++SO) { 3435 // C++ [class.abstract]p4: 3436 // A class is abstract if it contains or inherits at least one 3437 // pure virtual function for which the final overrider is pure 3438 // virtual. 3439 3440 // 3441 if (SO->second.size() != 1) 3442 continue; 3443 3444 if (!SO->second.front().Method->isPure()) 3445 continue; 3446 3447 if (!SeenPureMethods.insert(SO->second.front().Method)) 3448 continue; 3449 3450 Diag(SO->second.front().Method->getLocation(), 3451 diag::note_pure_virtual_function) 3452 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3453 } 3454 } 3455 3456 if (!PureVirtualClassDiagSet) 3457 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3458 PureVirtualClassDiagSet->insert(RD); 3459} 3460 3461namespace { 3462struct AbstractUsageInfo { 3463 Sema &S; 3464 CXXRecordDecl *Record; 3465 CanQualType AbstractType; 3466 bool Invalid; 3467 3468 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3469 : S(S), Record(Record), 3470 AbstractType(S.Context.getCanonicalType( 3471 S.Context.getTypeDeclType(Record))), 3472 Invalid(false) {} 3473 3474 void DiagnoseAbstractType() { 3475 if (Invalid) return; 3476 S.DiagnoseAbstractType(Record); 3477 Invalid = true; 3478 } 3479 3480 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3481}; 3482 3483struct CheckAbstractUsage { 3484 AbstractUsageInfo &Info; 3485 const NamedDecl *Ctx; 3486 3487 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3488 : Info(Info), Ctx(Ctx) {} 3489 3490 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3491 switch (TL.getTypeLocClass()) { 3492#define ABSTRACT_TYPELOC(CLASS, PARENT) 3493#define TYPELOC(CLASS, PARENT) \ 3494 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3495#include "clang/AST/TypeLocNodes.def" 3496 } 3497 } 3498 3499 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3500 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3501 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3502 if (!TL.getArg(I)) 3503 continue; 3504 3505 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3506 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3507 } 3508 } 3509 3510 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3511 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3512 } 3513 3514 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3515 // Visit the type parameters from a permissive context. 3516 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3517 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3518 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3519 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3520 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3521 // TODO: other template argument types? 3522 } 3523 } 3524 3525 // Visit pointee types from a permissive context. 3526#define CheckPolymorphic(Type) \ 3527 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3528 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3529 } 3530 CheckPolymorphic(PointerTypeLoc) 3531 CheckPolymorphic(ReferenceTypeLoc) 3532 CheckPolymorphic(MemberPointerTypeLoc) 3533 CheckPolymorphic(BlockPointerTypeLoc) 3534 CheckPolymorphic(AtomicTypeLoc) 3535 3536 /// Handle all the types we haven't given a more specific 3537 /// implementation for above. 3538 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3539 // Every other kind of type that we haven't called out already 3540 // that has an inner type is either (1) sugar or (2) contains that 3541 // inner type in some way as a subobject. 3542 if (TypeLoc Next = TL.getNextTypeLoc()) 3543 return Visit(Next, Sel); 3544 3545 // If there's no inner type and we're in a permissive context, 3546 // don't diagnose. 3547 if (Sel == Sema::AbstractNone) return; 3548 3549 // Check whether the type matches the abstract type. 3550 QualType T = TL.getType(); 3551 if (T->isArrayType()) { 3552 Sel = Sema::AbstractArrayType; 3553 T = Info.S.Context.getBaseElementType(T); 3554 } 3555 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3556 if (CT != Info.AbstractType) return; 3557 3558 // It matched; do some magic. 3559 if (Sel == Sema::AbstractArrayType) { 3560 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3561 << T << TL.getSourceRange(); 3562 } else { 3563 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3564 << Sel << T << TL.getSourceRange(); 3565 } 3566 Info.DiagnoseAbstractType(); 3567 } 3568}; 3569 3570void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3571 Sema::AbstractDiagSelID Sel) { 3572 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3573} 3574 3575} 3576 3577/// Check for invalid uses of an abstract type in a method declaration. 3578static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3579 CXXMethodDecl *MD) { 3580 // No need to do the check on definitions, which require that 3581 // the return/param types be complete. 3582 if (MD->doesThisDeclarationHaveABody()) 3583 return; 3584 3585 // For safety's sake, just ignore it if we don't have type source 3586 // information. This should never happen for non-implicit methods, 3587 // but... 3588 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3589 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3590} 3591 3592/// Check for invalid uses of an abstract type within a class definition. 3593static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3594 CXXRecordDecl *RD) { 3595 for (CXXRecordDecl::decl_iterator 3596 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3597 Decl *D = *I; 3598 if (D->isImplicit()) continue; 3599 3600 // Methods and method templates. 3601 if (isa<CXXMethodDecl>(D)) { 3602 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3603 } else if (isa<FunctionTemplateDecl>(D)) { 3604 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3605 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3606 3607 // Fields and static variables. 3608 } else if (isa<FieldDecl>(D)) { 3609 FieldDecl *FD = cast<FieldDecl>(D); 3610 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3611 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3612 } else if (isa<VarDecl>(D)) { 3613 VarDecl *VD = cast<VarDecl>(D); 3614 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3615 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3616 3617 // Nested classes and class templates. 3618 } else if (isa<CXXRecordDecl>(D)) { 3619 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3620 } else if (isa<ClassTemplateDecl>(D)) { 3621 CheckAbstractClassUsage(Info, 3622 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3623 } 3624 } 3625} 3626 3627/// \brief Perform semantic checks on a class definition that has been 3628/// completing, introducing implicitly-declared members, checking for 3629/// abstract types, etc. 3630void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3631 if (!Record) 3632 return; 3633 3634 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3635 AbstractUsageInfo Info(*this, Record); 3636 CheckAbstractClassUsage(Info, Record); 3637 } 3638 3639 // If this is not an aggregate type and has no user-declared constructor, 3640 // complain about any non-static data members of reference or const scalar 3641 // type, since they will never get initializers. 3642 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3643 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3644 !Record->isLambda()) { 3645 bool Complained = false; 3646 for (RecordDecl::field_iterator F = Record->field_begin(), 3647 FEnd = Record->field_end(); 3648 F != FEnd; ++F) { 3649 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3650 continue; 3651 3652 if (F->getType()->isReferenceType() || 3653 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3654 if (!Complained) { 3655 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3656 << Record->getTagKind() << Record; 3657 Complained = true; 3658 } 3659 3660 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3661 << F->getType()->isReferenceType() 3662 << F->getDeclName(); 3663 } 3664 } 3665 } 3666 3667 if (Record->isDynamicClass() && !Record->isDependentType()) 3668 DynamicClasses.push_back(Record); 3669 3670 if (Record->getIdentifier()) { 3671 // C++ [class.mem]p13: 3672 // If T is the name of a class, then each of the following shall have a 3673 // name different from T: 3674 // - every member of every anonymous union that is a member of class T. 3675 // 3676 // C++ [class.mem]p14: 3677 // In addition, if class T has a user-declared constructor (12.1), every 3678 // non-static data member of class T shall have a name different from T. 3679 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3680 R.first != R.second; ++R.first) { 3681 NamedDecl *D = *R.first; 3682 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3683 isa<IndirectFieldDecl>(D)) { 3684 Diag(D->getLocation(), diag::err_member_name_of_class) 3685 << D->getDeclName(); 3686 break; 3687 } 3688 } 3689 } 3690 3691 // Warn if the class has virtual methods but non-virtual public destructor. 3692 if (Record->isPolymorphic() && !Record->isDependentType()) { 3693 CXXDestructorDecl *dtor = Record->getDestructor(); 3694 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3695 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3696 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3697 } 3698 3699 // See if a method overloads virtual methods in a base 3700 /// class without overriding any. 3701 if (!Record->isDependentType()) { 3702 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3703 MEnd = Record->method_end(); 3704 M != MEnd; ++M) { 3705 if (!(*M)->isStatic()) 3706 DiagnoseHiddenVirtualMethods(Record, *M); 3707 } 3708 } 3709 3710 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3711 // function that is not a constructor declares that member function to be 3712 // const. [...] The class of which that function is a member shall be 3713 // a literal type. 3714 // 3715 // If the class has virtual bases, any constexpr members will already have 3716 // been diagnosed by the checks performed on the member declaration, so 3717 // suppress this (less useful) diagnostic. 3718 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3719 !Record->isLiteral() && !Record->getNumVBases()) { 3720 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3721 MEnd = Record->method_end(); 3722 M != MEnd; ++M) { 3723 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3724 switch (Record->getTemplateSpecializationKind()) { 3725 case TSK_ImplicitInstantiation: 3726 case TSK_ExplicitInstantiationDeclaration: 3727 case TSK_ExplicitInstantiationDefinition: 3728 // If a template instantiates to a non-literal type, but its members 3729 // instantiate to constexpr functions, the template is technically 3730 // ill-formed, but we allow it for sanity. 3731 continue; 3732 3733 case TSK_Undeclared: 3734 case TSK_ExplicitSpecialization: 3735 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3736 PDiag(diag::err_constexpr_method_non_literal)); 3737 break; 3738 } 3739 3740 // Only produce one error per class. 3741 break; 3742 } 3743 } 3744 } 3745 3746 // Declare inherited constructors. We do this eagerly here because: 3747 // - The standard requires an eager diagnostic for conflicting inherited 3748 // constructors from different classes. 3749 // - The lazy declaration of the other implicit constructors is so as to not 3750 // waste space and performance on classes that are not meant to be 3751 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3752 // have inherited constructors. 3753 DeclareInheritedConstructors(Record); 3754 3755 if (!Record->isDependentType()) 3756 CheckExplicitlyDefaultedMethods(Record); 3757} 3758 3759void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3760 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3761 ME = Record->method_end(); 3762 MI != ME; ++MI) { 3763 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3764 switch (getSpecialMember(*MI)) { 3765 case CXXDefaultConstructor: 3766 CheckExplicitlyDefaultedDefaultConstructor( 3767 cast<CXXConstructorDecl>(*MI)); 3768 break; 3769 3770 case CXXDestructor: 3771 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3772 break; 3773 3774 case CXXCopyConstructor: 3775 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3776 break; 3777 3778 case CXXCopyAssignment: 3779 CheckExplicitlyDefaultedCopyAssignment(*MI); 3780 break; 3781 3782 case CXXMoveConstructor: 3783 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3784 break; 3785 3786 case CXXMoveAssignment: 3787 CheckExplicitlyDefaultedMoveAssignment(*MI); 3788 break; 3789 3790 case CXXInvalid: 3791 llvm_unreachable("non-special member explicitly defaulted!"); 3792 } 3793 } 3794 } 3795 3796} 3797 3798void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3799 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3800 3801 // Whether this was the first-declared instance of the constructor. 3802 // This affects whether we implicitly add an exception spec (and, eventually, 3803 // constexpr). It is also ill-formed to explicitly default a constructor such 3804 // that it would be deleted. (C++0x [decl.fct.def.default]) 3805 bool First = CD == CD->getCanonicalDecl(); 3806 3807 bool HadError = false; 3808 if (CD->getNumParams() != 0) { 3809 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3810 << CD->getSourceRange(); 3811 HadError = true; 3812 } 3813 3814 ImplicitExceptionSpecification Spec 3815 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3816 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3817 if (EPI.ExceptionSpecType == EST_Delayed) { 3818 // Exception specification depends on some deferred part of the class. We'll 3819 // try again when the class's definition has been fully processed. 3820 return; 3821 } 3822 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3823 *ExceptionType = Context.getFunctionType( 3824 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3825 3826 // C++11 [dcl.fct.def.default]p2: 3827 // An explicitly-defaulted function may be declared constexpr only if it 3828 // would have been implicitly declared as constexpr, 3829 // Do not apply this rule to templates, since core issue 1358 makes such 3830 // functions always instantiate to constexpr functions. 3831 if (CD->isConstexpr() && 3832 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3833 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3834 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3835 << CXXDefaultConstructor; 3836 HadError = true; 3837 } 3838 } 3839 // and may have an explicit exception-specification only if it is compatible 3840 // with the exception-specification on the implicit declaration. 3841 if (CtorType->hasExceptionSpec()) { 3842 if (CheckEquivalentExceptionSpec( 3843 PDiag(diag::err_incorrect_defaulted_exception_spec) 3844 << CXXDefaultConstructor, 3845 PDiag(), 3846 ExceptionType, SourceLocation(), 3847 CtorType, CD->getLocation())) { 3848 HadError = true; 3849 } 3850 } 3851 3852 // If a function is explicitly defaulted on its first declaration, 3853 if (First) { 3854 // -- it is implicitly considered to be constexpr if the implicit 3855 // definition would be, 3856 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3857 3858 // -- it is implicitly considered to have the same 3859 // exception-specification as if it had been implicitly declared 3860 // 3861 // FIXME: a compatible, but different, explicit exception specification 3862 // will be silently overridden. We should issue a warning if this happens. 3863 EPI.ExtInfo = CtorType->getExtInfo(); 3864 } 3865 3866 if (HadError) { 3867 CD->setInvalidDecl(); 3868 return; 3869 } 3870 3871 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3872 if (First) { 3873 CD->setDeletedAsWritten(); 3874 } else { 3875 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3876 << CXXDefaultConstructor; 3877 CD->setInvalidDecl(); 3878 } 3879 } 3880} 3881 3882void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3883 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3884 3885 // Whether this was the first-declared instance of the constructor. 3886 bool First = CD == CD->getCanonicalDecl(); 3887 3888 bool HadError = false; 3889 if (CD->getNumParams() != 1) { 3890 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3891 << CD->getSourceRange(); 3892 HadError = true; 3893 } 3894 3895 ImplicitExceptionSpecification Spec(Context); 3896 bool Const; 3897 llvm::tie(Spec, Const) = 3898 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3899 3900 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3901 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3902 *ExceptionType = Context.getFunctionType( 3903 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3904 3905 // Check for parameter type matching. 3906 // This is a copy ctor so we know it's a cv-qualified reference to T. 3907 QualType ArgType = CtorType->getArgType(0); 3908 if (ArgType->getPointeeType().isVolatileQualified()) { 3909 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3910 HadError = true; 3911 } 3912 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3913 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3914 HadError = true; 3915 } 3916 3917 // C++11 [dcl.fct.def.default]p2: 3918 // An explicitly-defaulted function may be declared constexpr only if it 3919 // would have been implicitly declared as constexpr, 3920 // Do not apply this rule to templates, since core issue 1358 makes such 3921 // functions always instantiate to constexpr functions. 3922 if (CD->isConstexpr() && 3923 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3924 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3925 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3926 << CXXCopyConstructor; 3927 HadError = true; 3928 } 3929 } 3930 // and may have an explicit exception-specification only if it is compatible 3931 // with the exception-specification on the implicit declaration. 3932 if (CtorType->hasExceptionSpec()) { 3933 if (CheckEquivalentExceptionSpec( 3934 PDiag(diag::err_incorrect_defaulted_exception_spec) 3935 << CXXCopyConstructor, 3936 PDiag(), 3937 ExceptionType, SourceLocation(), 3938 CtorType, CD->getLocation())) { 3939 HadError = true; 3940 } 3941 } 3942 3943 // If a function is explicitly defaulted on its first declaration, 3944 if (First) { 3945 // -- it is implicitly considered to be constexpr if the implicit 3946 // definition would be, 3947 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3948 3949 // -- it is implicitly considered to have the same 3950 // exception-specification as if it had been implicitly declared, and 3951 // 3952 // FIXME: a compatible, but different, explicit exception specification 3953 // will be silently overridden. We should issue a warning if this happens. 3954 EPI.ExtInfo = CtorType->getExtInfo(); 3955 3956 // -- [...] it shall have the same parameter type as if it had been 3957 // implicitly declared. 3958 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3959 } 3960 3961 if (HadError) { 3962 CD->setInvalidDecl(); 3963 return; 3964 } 3965 3966 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3967 if (First) { 3968 CD->setDeletedAsWritten(); 3969 } else { 3970 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3971 << CXXCopyConstructor; 3972 CD->setInvalidDecl(); 3973 } 3974 } 3975} 3976 3977void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3978 assert(MD->isExplicitlyDefaulted()); 3979 3980 // Whether this was the first-declared instance of the operator 3981 bool First = MD == MD->getCanonicalDecl(); 3982 3983 bool HadError = false; 3984 if (MD->getNumParams() != 1) { 3985 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3986 << MD->getSourceRange(); 3987 HadError = true; 3988 } 3989 3990 QualType ReturnType = 3991 MD->getType()->getAs<FunctionType>()->getResultType(); 3992 if (!ReturnType->isLValueReferenceType() || 3993 !Context.hasSameType( 3994 Context.getCanonicalType(ReturnType->getPointeeType()), 3995 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3996 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3997 HadError = true; 3998 } 3999 4000 ImplicitExceptionSpecification Spec(Context); 4001 bool Const; 4002 llvm::tie(Spec, Const) = 4003 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 4004 4005 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4006 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4007 *ExceptionType = Context.getFunctionType( 4008 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4009 4010 QualType ArgType = OperType->getArgType(0); 4011 if (!ArgType->isLValueReferenceType()) { 4012 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4013 HadError = true; 4014 } else { 4015 if (ArgType->getPointeeType().isVolatileQualified()) { 4016 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 4017 HadError = true; 4018 } 4019 if (ArgType->getPointeeType().isConstQualified() && !Const) { 4020 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 4021 HadError = true; 4022 } 4023 } 4024 4025 if (OperType->getTypeQuals()) { 4026 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 4027 HadError = true; 4028 } 4029 4030 if (OperType->hasExceptionSpec()) { 4031 if (CheckEquivalentExceptionSpec( 4032 PDiag(diag::err_incorrect_defaulted_exception_spec) 4033 << CXXCopyAssignment, 4034 PDiag(), 4035 ExceptionType, SourceLocation(), 4036 OperType, MD->getLocation())) { 4037 HadError = true; 4038 } 4039 } 4040 if (First) { 4041 // We set the declaration to have the computed exception spec here. 4042 // We duplicate the one parameter type. 4043 EPI.RefQualifier = OperType->getRefQualifier(); 4044 EPI.ExtInfo = OperType->getExtInfo(); 4045 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4046 } 4047 4048 if (HadError) { 4049 MD->setInvalidDecl(); 4050 return; 4051 } 4052 4053 if (ShouldDeleteSpecialMember(MD, CXXCopyAssignment)) { 4054 if (First) { 4055 MD->setDeletedAsWritten(); 4056 } else { 4057 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4058 << CXXCopyAssignment; 4059 MD->setInvalidDecl(); 4060 } 4061 } 4062} 4063 4064void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 4065 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 4066 4067 // Whether this was the first-declared instance of the constructor. 4068 bool First = CD == CD->getCanonicalDecl(); 4069 4070 bool HadError = false; 4071 if (CD->getNumParams() != 1) { 4072 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4073 << CD->getSourceRange(); 4074 HadError = true; 4075 } 4076 4077 ImplicitExceptionSpecification Spec( 4078 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4079 4080 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4081 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4082 *ExceptionType = Context.getFunctionType( 4083 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4084 4085 // Check for parameter type matching. 4086 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4087 QualType ArgType = CtorType->getArgType(0); 4088 if (ArgType->getPointeeType().isVolatileQualified()) { 4089 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4090 HadError = true; 4091 } 4092 if (ArgType->getPointeeType().isConstQualified()) { 4093 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4094 HadError = true; 4095 } 4096 4097 // C++11 [dcl.fct.def.default]p2: 4098 // An explicitly-defaulted function may be declared constexpr only if it 4099 // would have been implicitly declared as constexpr, 4100 // Do not apply this rule to templates, since core issue 1358 makes such 4101 // functions always instantiate to constexpr functions. 4102 if (CD->isConstexpr() && 4103 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4104 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4105 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4106 << CXXMoveConstructor; 4107 HadError = true; 4108 } 4109 } 4110 // and may have an explicit exception-specification only if it is compatible 4111 // with the exception-specification on the implicit declaration. 4112 if (CtorType->hasExceptionSpec()) { 4113 if (CheckEquivalentExceptionSpec( 4114 PDiag(diag::err_incorrect_defaulted_exception_spec) 4115 << CXXMoveConstructor, 4116 PDiag(), 4117 ExceptionType, SourceLocation(), 4118 CtorType, CD->getLocation())) { 4119 HadError = true; 4120 } 4121 } 4122 4123 // If a function is explicitly defaulted on its first declaration, 4124 if (First) { 4125 // -- it is implicitly considered to be constexpr if the implicit 4126 // definition would be, 4127 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4128 4129 // -- it is implicitly considered to have the same 4130 // exception-specification as if it had been implicitly declared, and 4131 // 4132 // FIXME: a compatible, but different, explicit exception specification 4133 // will be silently overridden. We should issue a warning if this happens. 4134 EPI.ExtInfo = CtorType->getExtInfo(); 4135 4136 // -- [...] it shall have the same parameter type as if it had been 4137 // implicitly declared. 4138 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4139 } 4140 4141 if (HadError) { 4142 CD->setInvalidDecl(); 4143 return; 4144 } 4145 4146 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4147 if (First) { 4148 CD->setDeletedAsWritten(); 4149 } else { 4150 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4151 << CXXMoveConstructor; 4152 CD->setInvalidDecl(); 4153 } 4154 } 4155} 4156 4157void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4158 assert(MD->isExplicitlyDefaulted()); 4159 4160 // Whether this was the first-declared instance of the operator 4161 bool First = MD == MD->getCanonicalDecl(); 4162 4163 bool HadError = false; 4164 if (MD->getNumParams() != 1) { 4165 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4166 << MD->getSourceRange(); 4167 HadError = true; 4168 } 4169 4170 QualType ReturnType = 4171 MD->getType()->getAs<FunctionType>()->getResultType(); 4172 if (!ReturnType->isLValueReferenceType() || 4173 !Context.hasSameType( 4174 Context.getCanonicalType(ReturnType->getPointeeType()), 4175 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4176 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4177 HadError = true; 4178 } 4179 4180 ImplicitExceptionSpecification Spec( 4181 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4182 4183 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4184 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4185 *ExceptionType = Context.getFunctionType( 4186 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4187 4188 QualType ArgType = OperType->getArgType(0); 4189 if (!ArgType->isRValueReferenceType()) { 4190 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4191 HadError = true; 4192 } else { 4193 if (ArgType->getPointeeType().isVolatileQualified()) { 4194 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4195 HadError = true; 4196 } 4197 if (ArgType->getPointeeType().isConstQualified()) { 4198 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4199 HadError = true; 4200 } 4201 } 4202 4203 if (OperType->getTypeQuals()) { 4204 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4205 HadError = true; 4206 } 4207 4208 if (OperType->hasExceptionSpec()) { 4209 if (CheckEquivalentExceptionSpec( 4210 PDiag(diag::err_incorrect_defaulted_exception_spec) 4211 << CXXMoveAssignment, 4212 PDiag(), 4213 ExceptionType, SourceLocation(), 4214 OperType, MD->getLocation())) { 4215 HadError = true; 4216 } 4217 } 4218 if (First) { 4219 // We set the declaration to have the computed exception spec here. 4220 // We duplicate the one parameter type. 4221 EPI.RefQualifier = OperType->getRefQualifier(); 4222 EPI.ExtInfo = OperType->getExtInfo(); 4223 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4224 } 4225 4226 if (HadError) { 4227 MD->setInvalidDecl(); 4228 return; 4229 } 4230 4231 if (ShouldDeleteSpecialMember(MD, CXXMoveAssignment)) { 4232 if (First) { 4233 MD->setDeletedAsWritten(); 4234 } else { 4235 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4236 << CXXMoveAssignment; 4237 MD->setInvalidDecl(); 4238 } 4239 } 4240} 4241 4242void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4243 assert(DD->isExplicitlyDefaulted()); 4244 4245 // Whether this was the first-declared instance of the destructor. 4246 bool First = DD == DD->getCanonicalDecl(); 4247 4248 ImplicitExceptionSpecification Spec 4249 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4250 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4251 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4252 *ExceptionType = Context.getFunctionType( 4253 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4254 4255 if (DtorType->hasExceptionSpec()) { 4256 if (CheckEquivalentExceptionSpec( 4257 PDiag(diag::err_incorrect_defaulted_exception_spec) 4258 << CXXDestructor, 4259 PDiag(), 4260 ExceptionType, SourceLocation(), 4261 DtorType, DD->getLocation())) { 4262 DD->setInvalidDecl(); 4263 return; 4264 } 4265 } 4266 if (First) { 4267 // We set the declaration to have the computed exception spec here. 4268 // There are no parameters. 4269 EPI.ExtInfo = DtorType->getExtInfo(); 4270 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4271 } 4272 4273 if (ShouldDeleteSpecialMember(DD, CXXDestructor)) { 4274 if (First) { 4275 DD->setDeletedAsWritten(); 4276 } else { 4277 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4278 << CXXDestructor; 4279 DD->setInvalidDecl(); 4280 } 4281 } 4282} 4283 4284namespace { 4285struct SpecialMemberDeletionInfo { 4286 Sema &S; 4287 CXXMethodDecl *MD; 4288 Sema::CXXSpecialMember CSM; 4289 4290 // Properties of the special member, computed for convenience. 4291 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4292 SourceLocation Loc; 4293 4294 bool AllFieldsAreConst; 4295 4296 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4297 Sema::CXXSpecialMember CSM) 4298 : S(S), MD(MD), CSM(CSM), 4299 IsConstructor(false), IsAssignment(false), IsMove(false), 4300 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4301 AllFieldsAreConst(true) { 4302 switch (CSM) { 4303 case Sema::CXXDefaultConstructor: 4304 case Sema::CXXCopyConstructor: 4305 IsConstructor = true; 4306 break; 4307 case Sema::CXXMoveConstructor: 4308 IsConstructor = true; 4309 IsMove = true; 4310 break; 4311 case Sema::CXXCopyAssignment: 4312 IsAssignment = true; 4313 break; 4314 case Sema::CXXMoveAssignment: 4315 IsAssignment = true; 4316 IsMove = true; 4317 break; 4318 case Sema::CXXDestructor: 4319 break; 4320 case Sema::CXXInvalid: 4321 llvm_unreachable("invalid special member kind"); 4322 } 4323 4324 if (MD->getNumParams()) { 4325 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4326 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4327 } 4328 } 4329 4330 bool inUnion() const { return MD->getParent()->isUnion(); } 4331 4332 /// Look up the corresponding special member in the given class. 4333 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class) { 4334 unsigned TQ = MD->getTypeQualifiers(); 4335 return S.LookupSpecialMember(Class, CSM, ConstArg, VolatileArg, 4336 MD->getRefQualifier() == RQ_RValue, 4337 TQ & Qualifiers::Const, 4338 TQ & Qualifiers::Volatile); 4339 } 4340 4341 bool shouldDeleteForBase(CXXRecordDecl *BaseDecl, bool IsVirtualBase); 4342 bool shouldDeleteForField(FieldDecl *FD); 4343 bool shouldDeleteForAllConstMembers(); 4344}; 4345} 4346 4347/// Check whether we should delete a special member function due to the class 4348/// having a particular direct or virtual base class. 4349bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXRecordDecl *BaseDecl, 4350 bool IsVirtualBase) { 4351 // C++11 [class.copy]p23: 4352 // -- for the move assignment operator, any direct or indirect virtual 4353 // base class. 4354 if (CSM == Sema::CXXMoveAssignment && IsVirtualBase) 4355 return true; 4356 4357 // C++11 [class.ctor]p5, C++11 [class.copy]p11, C++11 [class.dtor]p5: 4358 // -- any direct or virtual base class [...] has a type with a destructor 4359 // that is deleted or inaccessible 4360 if (!IsAssignment) { 4361 CXXDestructorDecl *BaseDtor = S.LookupDestructor(BaseDecl); 4362 if (BaseDtor->isDeleted()) 4363 return true; 4364 if (S.CheckDestructorAccess(Loc, BaseDtor, S.PDiag()) 4365 != Sema::AR_accessible) 4366 return true; 4367 } 4368 4369 // C++11 [class.ctor]p5: 4370 // -- any direct or virtual base class [...] has class type M [...] and 4371 // either M has no default constructor or overload resolution as applied 4372 // to M's default constructor results in an ambiguity or in a function 4373 // that is deleted or inaccessible 4374 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4375 // -- a direct or virtual base class B that cannot be copied/moved because 4376 // overload resolution, as applied to B's corresponding special member, 4377 // results in an ambiguity or a function that is deleted or inaccessible 4378 // from the defaulted special member 4379 if (CSM != Sema::CXXDestructor) { 4380 Sema::SpecialMemberOverloadResult *SMOR = lookupIn(BaseDecl); 4381 if (!SMOR->hasSuccess()) 4382 return true; 4383 4384 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4385 if (IsConstructor) { 4386 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4387 if (S.CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4388 S.PDiag()) != Sema::AR_accessible) 4389 return true; 4390 4391 // -- for the move constructor, a [...] direct or virtual base class with 4392 // a type that does not have a move constructor and is not trivially 4393 // copyable. 4394 if (IsMove && !BaseCtor->isMoveConstructor() && 4395 !BaseDecl->isTriviallyCopyable()) 4396 return true; 4397 } else { 4398 assert(IsAssignment && "unexpected kind of special member"); 4399 if (S.CheckDirectMemberAccess(Loc, BaseMember, S.PDiag()) 4400 != Sema::AR_accessible) 4401 return true; 4402 4403 // -- for the move assignment operator, a direct base class with a type 4404 // that does not have a move assignment operator and is not trivially 4405 // copyable. 4406 if (IsMove && !BaseMember->isMoveAssignmentOperator() && 4407 !BaseDecl->isTriviallyCopyable()) 4408 return true; 4409 } 4410 } 4411 4412 // C++11 [class.dtor]p5: 4413 // -- for a virtual destructor, lookup of the non-array deallocation function 4414 // results in an ambiguity or in a function that is deleted or inaccessible 4415 if (CSM == Sema::CXXDestructor && MD->isVirtual()) { 4416 FunctionDecl *OperatorDelete = 0; 4417 DeclarationName Name = 4418 S.Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4419 if (S.FindDeallocationFunction(Loc, MD->getParent(), Name, 4420 OperatorDelete, false)) 4421 return true; 4422 } 4423 4424 return false; 4425} 4426 4427/// Check whether we should delete a special member function due to the class 4428/// having a particular non-static data member. 4429bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4430 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4431 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4432 4433 if (CSM == Sema::CXXDefaultConstructor) { 4434 // For a default constructor, all references must be initialized in-class 4435 // and, if a union, it must have a non-const member. 4436 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) 4437 return true; 4438 4439 if (inUnion() && !FieldType.isConstQualified()) 4440 AllFieldsAreConst = false; 4441 } else if (CSM == Sema::CXXCopyConstructor) { 4442 // For a copy constructor, data members must not be of rvalue reference 4443 // type. 4444 if (FieldType->isRValueReferenceType()) 4445 return true; 4446 } else if (IsAssignment) { 4447 // For an assignment operator, data members must not be of reference type. 4448 if (FieldType->isReferenceType()) 4449 return true; 4450 } 4451 4452 if (FieldRecord) { 4453 // For a default constructor, a const member must have a user-provided 4454 // default constructor or else be explicitly initialized. 4455 if (CSM == Sema::CXXDefaultConstructor && FieldType.isConstQualified() && 4456 !FD->hasInClassInitializer() && 4457 !FieldRecord->hasUserProvidedDefaultConstructor()) 4458 return true; 4459 4460 // Some additional restrictions exist on the variant members. 4461 if (!inUnion() && FieldRecord->isUnion() && 4462 FieldRecord->isAnonymousStructOrUnion()) { 4463 bool AllVariantFieldsAreConst = true; 4464 4465 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4466 UE = FieldRecord->field_end(); 4467 UI != UE; ++UI) { 4468 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4469 CXXRecordDecl *UnionFieldRecord = 4470 UnionFieldType->getAsCXXRecordDecl(); 4471 4472 if (!UnionFieldType.isConstQualified()) 4473 AllVariantFieldsAreConst = false; 4474 4475 if (UnionFieldRecord) { 4476 // FIXME: Checking for accessibility and validity of this 4477 // destructor is technically going beyond the 4478 // standard, but this is believed to be a defect. 4479 if (!IsAssignment) { 4480 CXXDestructorDecl *FieldDtor = S.LookupDestructor(UnionFieldRecord); 4481 if (FieldDtor->isDeleted()) 4482 return true; 4483 if (S.CheckDestructorAccess(Loc, FieldDtor, S.PDiag()) != 4484 Sema::AR_accessible) 4485 return true; 4486 if (!FieldDtor->isTrivial()) 4487 return true; 4488 } 4489 4490 // FIXME: in-class initializers should be handled here 4491 if (CSM != Sema::CXXDestructor) { 4492 Sema::SpecialMemberOverloadResult *SMOR = 4493 lookupIn(UnionFieldRecord); 4494 // FIXME: Checking for accessibility and validity of this 4495 // corresponding member is technically going beyond the 4496 // standard, but this is believed to be a defect. 4497 if (!SMOR->hasSuccess()) 4498 return true; 4499 4500 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4501 // A member of a union must have a trivial corresponding 4502 // special member. 4503 if (!FieldMember->isTrivial()) 4504 return true; 4505 4506 if (IsConstructor) { 4507 CXXConstructorDecl *FieldCtor = 4508 cast<CXXConstructorDecl>(FieldMember); 4509 if (S.CheckConstructorAccess(Loc, FieldCtor, 4510 FieldCtor->getAccess(), 4511 S.PDiag()) != Sema::AR_accessible) 4512 return true; 4513 } else { 4514 assert(IsAssignment && "unexpected kind of special member"); 4515 if (S.CheckDirectMemberAccess(Loc, FieldMember, S.PDiag()) 4516 != Sema::AR_accessible) 4517 return true; 4518 } 4519 } 4520 } 4521 } 4522 4523 // At least one member in each anonymous union must be non-const 4524 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst) 4525 return true; 4526 4527 // Don't try to initialize the anonymous union 4528 // This is technically non-conformant, but sanity demands it. 4529 return false; 4530 } 4531 4532 // Unless we're doing assignment, the field's destructor must be 4533 // accessible and not deleted. 4534 if (!IsAssignment) { 4535 CXXDestructorDecl *FieldDtor = S.LookupDestructor(FieldRecord); 4536 if (FieldDtor->isDeleted()) 4537 return true; 4538 if (S.CheckDestructorAccess(Loc, FieldDtor, S.PDiag()) != 4539 Sema::AR_accessible) 4540 return true; 4541 } 4542 4543 // Check that the corresponding member of the field is accessible, 4544 // unique, and non-deleted. We don't do this if it has an explicit 4545 // initialization when default-constructing. 4546 if (CSM != Sema::CXXDestructor && 4547 !(CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer())) { 4548 Sema::SpecialMemberOverloadResult *SMOR = lookupIn(FieldRecord); 4549 if (!SMOR->hasSuccess()) 4550 return true; 4551 4552 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4553 if (IsConstructor) { 4554 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4555 if (S.CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4556 S.PDiag()) != Sema::AR_accessible) 4557 return true; 4558 4559 // For a move operation, the corresponding operation must actually 4560 // be a move operation (and not a copy selected by overload 4561 // resolution) unless we are working on a trivially copyable class. 4562 if (IsMove && !FieldCtor->isMoveConstructor() && 4563 !FieldRecord->isTriviallyCopyable()) 4564 return true; 4565 } else { 4566 assert(IsAssignment && "unexpected kind of special member"); 4567 if (S.CheckDirectMemberAccess(Loc, FieldMember, S.PDiag()) 4568 != Sema::AR_accessible) 4569 return true; 4570 4571 // -- for the move assignment operator, a non-static data member with a 4572 // type that does not have a move assignment operator and is not 4573 // trivially copyable. 4574 if (IsMove && !FieldMember->isMoveAssignmentOperator() && 4575 !FieldRecord->isTriviallyCopyable()) 4576 return true; 4577 } 4578 4579 // We need the corresponding member of a union to be trivial so that 4580 // we can safely copy them all simultaneously. 4581 // FIXME: Note that performing the check here (where we rely on the lack 4582 // of an in-class initializer) is technically ill-formed. However, this 4583 // seems most obviously to be a bug in the standard. 4584 if (inUnion() && !FieldMember->isTrivial()) 4585 return true; 4586 } 4587 } else if (CSM == Sema::CXXDefaultConstructor && !inUnion() && 4588 FieldType.isConstQualified() && !FD->hasInClassInitializer()) { 4589 // We can't initialize a const member of non-class type to any value. 4590 return true; 4591 } else if (IsAssignment && FieldType.isConstQualified()) { 4592 // C++11 [class.copy]p23: 4593 // -- a non-static data member of const non-class type (or array thereof) 4594 return true; 4595 } 4596 4597 return false; 4598} 4599 4600/// C++11 [class.ctor] p5: 4601/// A defaulted default constructor for a class X is defined as deleted if 4602/// X is a union and all of its variant members are of const-qualified type. 4603bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4604 return CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst; 4605} 4606 4607/// Determine whether a defaulted special member function should be defined as 4608/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4609/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4610bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4611 assert(!MD->isInvalidDecl()); 4612 CXXRecordDecl *RD = MD->getParent(); 4613 assert(!RD->isDependentType() && "do deletion after instantiation"); 4614 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4615 return false; 4616 4617 // C++11 [expr.lambda.prim]p19: 4618 // The closure type associated with a lambda-expression has a 4619 // deleted (8.4.3) default constructor and a deleted copy 4620 // assignment operator. 4621 if (RD->isLambda() && 4622 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) 4623 return true; 4624 4625 // For an anonymous struct or union, the copy and assignment special members 4626 // will never be used, so skip the check. For an anonymous union declared at 4627 // namespace scope, the constructor and destructor are used. 4628 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4629 RD->isAnonymousStructOrUnion()) 4630 return false; 4631 4632 // Do access control from the special member function 4633 ContextRAII MethodContext(*this, MD); 4634 4635 SpecialMemberDeletionInfo SMI(*this, MD, CSM); 4636 4637 // FIXME: We should put some diagnostic logic right into this function. 4638 4639 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4640 BE = RD->bases_end(); BI != BE; ++BI) 4641 if (!BI->isVirtual() && 4642 SMI.shouldDeleteForBase(BI->getType()->getAsCXXRecordDecl(), false)) 4643 return true; 4644 4645 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4646 BE = RD->vbases_end(); BI != BE; ++BI) 4647 if (SMI.shouldDeleteForBase(BI->getType()->getAsCXXRecordDecl(), true)) 4648 return true; 4649 4650 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4651 FE = RD->field_end(); FI != FE; ++FI) 4652 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4653 SMI.shouldDeleteForField(*FI)) 4654 return true; 4655 4656 if (SMI.shouldDeleteForAllConstMembers()) 4657 return true; 4658 4659 return false; 4660} 4661 4662/// \brief Data used with FindHiddenVirtualMethod 4663namespace { 4664 struct FindHiddenVirtualMethodData { 4665 Sema *S; 4666 CXXMethodDecl *Method; 4667 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4668 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4669 }; 4670} 4671 4672/// \brief Member lookup function that determines whether a given C++ 4673/// method overloads virtual methods in a base class without overriding any, 4674/// to be used with CXXRecordDecl::lookupInBases(). 4675static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4676 CXXBasePath &Path, 4677 void *UserData) { 4678 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4679 4680 FindHiddenVirtualMethodData &Data 4681 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4682 4683 DeclarationName Name = Data.Method->getDeclName(); 4684 assert(Name.getNameKind() == DeclarationName::Identifier); 4685 4686 bool foundSameNameMethod = false; 4687 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4688 for (Path.Decls = BaseRecord->lookup(Name); 4689 Path.Decls.first != Path.Decls.second; 4690 ++Path.Decls.first) { 4691 NamedDecl *D = *Path.Decls.first; 4692 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4693 MD = MD->getCanonicalDecl(); 4694 foundSameNameMethod = true; 4695 // Interested only in hidden virtual methods. 4696 if (!MD->isVirtual()) 4697 continue; 4698 // If the method we are checking overrides a method from its base 4699 // don't warn about the other overloaded methods. 4700 if (!Data.S->IsOverload(Data.Method, MD, false)) 4701 return true; 4702 // Collect the overload only if its hidden. 4703 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4704 overloadedMethods.push_back(MD); 4705 } 4706 } 4707 4708 if (foundSameNameMethod) 4709 Data.OverloadedMethods.append(overloadedMethods.begin(), 4710 overloadedMethods.end()); 4711 return foundSameNameMethod; 4712} 4713 4714/// \brief See if a method overloads virtual methods in a base class without 4715/// overriding any. 4716void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4717 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4718 MD->getLocation()) == DiagnosticsEngine::Ignored) 4719 return; 4720 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4721 return; 4722 4723 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4724 /*bool RecordPaths=*/false, 4725 /*bool DetectVirtual=*/false); 4726 FindHiddenVirtualMethodData Data; 4727 Data.Method = MD; 4728 Data.S = this; 4729 4730 // Keep the base methods that were overriden or introduced in the subclass 4731 // by 'using' in a set. A base method not in this set is hidden. 4732 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4733 res.first != res.second; ++res.first) { 4734 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4735 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4736 E = MD->end_overridden_methods(); 4737 I != E; ++I) 4738 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4739 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4740 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4741 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4742 } 4743 4744 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4745 !Data.OverloadedMethods.empty()) { 4746 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4747 << MD << (Data.OverloadedMethods.size() > 1); 4748 4749 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4750 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4751 Diag(overloadedMD->getLocation(), 4752 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4753 } 4754 } 4755} 4756 4757void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4758 Decl *TagDecl, 4759 SourceLocation LBrac, 4760 SourceLocation RBrac, 4761 AttributeList *AttrList) { 4762 if (!TagDecl) 4763 return; 4764 4765 AdjustDeclIfTemplate(TagDecl); 4766 4767 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4768 // strict aliasing violation! 4769 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4770 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4771 4772 CheckCompletedCXXClass( 4773 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4774} 4775 4776/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4777/// special functions, such as the default constructor, copy 4778/// constructor, or destructor, to the given C++ class (C++ 4779/// [special]p1). This routine can only be executed just before the 4780/// definition of the class is complete. 4781void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4782 if (!ClassDecl->hasUserDeclaredConstructor()) 4783 ++ASTContext::NumImplicitDefaultConstructors; 4784 4785 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4786 ++ASTContext::NumImplicitCopyConstructors; 4787 4788 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4789 ++ASTContext::NumImplicitMoveConstructors; 4790 4791 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4792 ++ASTContext::NumImplicitCopyAssignmentOperators; 4793 4794 // If we have a dynamic class, then the copy assignment operator may be 4795 // virtual, so we have to declare it immediately. This ensures that, e.g., 4796 // it shows up in the right place in the vtable and that we diagnose 4797 // problems with the implicit exception specification. 4798 if (ClassDecl->isDynamicClass()) 4799 DeclareImplicitCopyAssignment(ClassDecl); 4800 } 4801 4802 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()){ 4803 ++ASTContext::NumImplicitMoveAssignmentOperators; 4804 4805 // Likewise for the move assignment operator. 4806 if (ClassDecl->isDynamicClass()) 4807 DeclareImplicitMoveAssignment(ClassDecl); 4808 } 4809 4810 if (!ClassDecl->hasUserDeclaredDestructor()) { 4811 ++ASTContext::NumImplicitDestructors; 4812 4813 // If we have a dynamic class, then the destructor may be virtual, so we 4814 // have to declare the destructor immediately. This ensures that, e.g., it 4815 // shows up in the right place in the vtable and that we diagnose problems 4816 // with the implicit exception specification. 4817 if (ClassDecl->isDynamicClass()) 4818 DeclareImplicitDestructor(ClassDecl); 4819 } 4820} 4821 4822void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4823 if (!D) 4824 return; 4825 4826 int NumParamList = D->getNumTemplateParameterLists(); 4827 for (int i = 0; i < NumParamList; i++) { 4828 TemplateParameterList* Params = D->getTemplateParameterList(i); 4829 for (TemplateParameterList::iterator Param = Params->begin(), 4830 ParamEnd = Params->end(); 4831 Param != ParamEnd; ++Param) { 4832 NamedDecl *Named = cast<NamedDecl>(*Param); 4833 if (Named->getDeclName()) { 4834 S->AddDecl(Named); 4835 IdResolver.AddDecl(Named); 4836 } 4837 } 4838 } 4839} 4840 4841void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4842 if (!D) 4843 return; 4844 4845 TemplateParameterList *Params = 0; 4846 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4847 Params = Template->getTemplateParameters(); 4848 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4849 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4850 Params = PartialSpec->getTemplateParameters(); 4851 else 4852 return; 4853 4854 for (TemplateParameterList::iterator Param = Params->begin(), 4855 ParamEnd = Params->end(); 4856 Param != ParamEnd; ++Param) { 4857 NamedDecl *Named = cast<NamedDecl>(*Param); 4858 if (Named->getDeclName()) { 4859 S->AddDecl(Named); 4860 IdResolver.AddDecl(Named); 4861 } 4862 } 4863} 4864 4865void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4866 if (!RecordD) return; 4867 AdjustDeclIfTemplate(RecordD); 4868 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4869 PushDeclContext(S, Record); 4870} 4871 4872void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4873 if (!RecordD) return; 4874 PopDeclContext(); 4875} 4876 4877/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4878/// parsing a top-level (non-nested) C++ class, and we are now 4879/// parsing those parts of the given Method declaration that could 4880/// not be parsed earlier (C++ [class.mem]p2), such as default 4881/// arguments. This action should enter the scope of the given 4882/// Method declaration as if we had just parsed the qualified method 4883/// name. However, it should not bring the parameters into scope; 4884/// that will be performed by ActOnDelayedCXXMethodParameter. 4885void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4886} 4887 4888/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4889/// C++ method declaration. We're (re-)introducing the given 4890/// function parameter into scope for use in parsing later parts of 4891/// the method declaration. For example, we could see an 4892/// ActOnParamDefaultArgument event for this parameter. 4893void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4894 if (!ParamD) 4895 return; 4896 4897 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4898 4899 // If this parameter has an unparsed default argument, clear it out 4900 // to make way for the parsed default argument. 4901 if (Param->hasUnparsedDefaultArg()) 4902 Param->setDefaultArg(0); 4903 4904 S->AddDecl(Param); 4905 if (Param->getDeclName()) 4906 IdResolver.AddDecl(Param); 4907} 4908 4909/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4910/// processing the delayed method declaration for Method. The method 4911/// declaration is now considered finished. There may be a separate 4912/// ActOnStartOfFunctionDef action later (not necessarily 4913/// immediately!) for this method, if it was also defined inside the 4914/// class body. 4915void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4916 if (!MethodD) 4917 return; 4918 4919 AdjustDeclIfTemplate(MethodD); 4920 4921 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4922 4923 // Now that we have our default arguments, check the constructor 4924 // again. It could produce additional diagnostics or affect whether 4925 // the class has implicitly-declared destructors, among other 4926 // things. 4927 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4928 CheckConstructor(Constructor); 4929 4930 // Check the default arguments, which we may have added. 4931 if (!Method->isInvalidDecl()) 4932 CheckCXXDefaultArguments(Method); 4933} 4934 4935/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4936/// the well-formedness of the constructor declarator @p D with type @p 4937/// R. If there are any errors in the declarator, this routine will 4938/// emit diagnostics and set the invalid bit to true. In any case, the type 4939/// will be updated to reflect a well-formed type for the constructor and 4940/// returned. 4941QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4942 StorageClass &SC) { 4943 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4944 4945 // C++ [class.ctor]p3: 4946 // A constructor shall not be virtual (10.3) or static (9.4). A 4947 // constructor can be invoked for a const, volatile or const 4948 // volatile object. A constructor shall not be declared const, 4949 // volatile, or const volatile (9.3.2). 4950 if (isVirtual) { 4951 if (!D.isInvalidType()) 4952 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4953 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4954 << SourceRange(D.getIdentifierLoc()); 4955 D.setInvalidType(); 4956 } 4957 if (SC == SC_Static) { 4958 if (!D.isInvalidType()) 4959 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4960 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4961 << SourceRange(D.getIdentifierLoc()); 4962 D.setInvalidType(); 4963 SC = SC_None; 4964 } 4965 4966 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4967 if (FTI.TypeQuals != 0) { 4968 if (FTI.TypeQuals & Qualifiers::Const) 4969 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4970 << "const" << SourceRange(D.getIdentifierLoc()); 4971 if (FTI.TypeQuals & Qualifiers::Volatile) 4972 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4973 << "volatile" << SourceRange(D.getIdentifierLoc()); 4974 if (FTI.TypeQuals & Qualifiers::Restrict) 4975 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4976 << "restrict" << SourceRange(D.getIdentifierLoc()); 4977 D.setInvalidType(); 4978 } 4979 4980 // C++0x [class.ctor]p4: 4981 // A constructor shall not be declared with a ref-qualifier. 4982 if (FTI.hasRefQualifier()) { 4983 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4984 << FTI.RefQualifierIsLValueRef 4985 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4986 D.setInvalidType(); 4987 } 4988 4989 // Rebuild the function type "R" without any type qualifiers (in 4990 // case any of the errors above fired) and with "void" as the 4991 // return type, since constructors don't have return types. 4992 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4993 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4994 return R; 4995 4996 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4997 EPI.TypeQuals = 0; 4998 EPI.RefQualifier = RQ_None; 4999 5000 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5001 Proto->getNumArgs(), EPI); 5002} 5003 5004/// CheckConstructor - Checks a fully-formed constructor for 5005/// well-formedness, issuing any diagnostics required. Returns true if 5006/// the constructor declarator is invalid. 5007void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5008 CXXRecordDecl *ClassDecl 5009 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5010 if (!ClassDecl) 5011 return Constructor->setInvalidDecl(); 5012 5013 // C++ [class.copy]p3: 5014 // A declaration of a constructor for a class X is ill-formed if 5015 // its first parameter is of type (optionally cv-qualified) X and 5016 // either there are no other parameters or else all other 5017 // parameters have default arguments. 5018 if (!Constructor->isInvalidDecl() && 5019 ((Constructor->getNumParams() == 1) || 5020 (Constructor->getNumParams() > 1 && 5021 Constructor->getParamDecl(1)->hasDefaultArg())) && 5022 Constructor->getTemplateSpecializationKind() 5023 != TSK_ImplicitInstantiation) { 5024 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5025 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5026 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5027 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5028 const char *ConstRef 5029 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5030 : " const &"; 5031 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5032 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5033 5034 // FIXME: Rather that making the constructor invalid, we should endeavor 5035 // to fix the type. 5036 Constructor->setInvalidDecl(); 5037 } 5038 } 5039} 5040 5041/// CheckDestructor - Checks a fully-formed destructor definition for 5042/// well-formedness, issuing any diagnostics required. Returns true 5043/// on error. 5044bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5045 CXXRecordDecl *RD = Destructor->getParent(); 5046 5047 if (Destructor->isVirtual()) { 5048 SourceLocation Loc; 5049 5050 if (!Destructor->isImplicit()) 5051 Loc = Destructor->getLocation(); 5052 else 5053 Loc = RD->getLocation(); 5054 5055 // If we have a virtual destructor, look up the deallocation function 5056 FunctionDecl *OperatorDelete = 0; 5057 DeclarationName Name = 5058 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5059 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5060 return true; 5061 5062 MarkFunctionReferenced(Loc, OperatorDelete); 5063 5064 Destructor->setOperatorDelete(OperatorDelete); 5065 } 5066 5067 return false; 5068} 5069 5070static inline bool 5071FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5072 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5073 FTI.ArgInfo[0].Param && 5074 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5075} 5076 5077/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5078/// the well-formednes of the destructor declarator @p D with type @p 5079/// R. If there are any errors in the declarator, this routine will 5080/// emit diagnostics and set the declarator to invalid. Even if this happens, 5081/// will be updated to reflect a well-formed type for the destructor and 5082/// returned. 5083QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5084 StorageClass& SC) { 5085 // C++ [class.dtor]p1: 5086 // [...] A typedef-name that names a class is a class-name 5087 // (7.1.3); however, a typedef-name that names a class shall not 5088 // be used as the identifier in the declarator for a destructor 5089 // declaration. 5090 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5091 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5092 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5093 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5094 else if (const TemplateSpecializationType *TST = 5095 DeclaratorType->getAs<TemplateSpecializationType>()) 5096 if (TST->isTypeAlias()) 5097 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5098 << DeclaratorType << 1; 5099 5100 // C++ [class.dtor]p2: 5101 // A destructor is used to destroy objects of its class type. A 5102 // destructor takes no parameters, and no return type can be 5103 // specified for it (not even void). The address of a destructor 5104 // shall not be taken. A destructor shall not be static. A 5105 // destructor can be invoked for a const, volatile or const 5106 // volatile object. A destructor shall not be declared const, 5107 // volatile or const volatile (9.3.2). 5108 if (SC == SC_Static) { 5109 if (!D.isInvalidType()) 5110 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5111 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5112 << SourceRange(D.getIdentifierLoc()) 5113 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5114 5115 SC = SC_None; 5116 } 5117 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5118 // Destructors don't have return types, but the parser will 5119 // happily parse something like: 5120 // 5121 // class X { 5122 // float ~X(); 5123 // }; 5124 // 5125 // The return type will be eliminated later. 5126 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5127 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5128 << SourceRange(D.getIdentifierLoc()); 5129 } 5130 5131 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5132 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5133 if (FTI.TypeQuals & Qualifiers::Const) 5134 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5135 << "const" << SourceRange(D.getIdentifierLoc()); 5136 if (FTI.TypeQuals & Qualifiers::Volatile) 5137 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5138 << "volatile" << SourceRange(D.getIdentifierLoc()); 5139 if (FTI.TypeQuals & Qualifiers::Restrict) 5140 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5141 << "restrict" << SourceRange(D.getIdentifierLoc()); 5142 D.setInvalidType(); 5143 } 5144 5145 // C++0x [class.dtor]p2: 5146 // A destructor shall not be declared with a ref-qualifier. 5147 if (FTI.hasRefQualifier()) { 5148 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5149 << FTI.RefQualifierIsLValueRef 5150 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5151 D.setInvalidType(); 5152 } 5153 5154 // Make sure we don't have any parameters. 5155 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5156 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5157 5158 // Delete the parameters. 5159 FTI.freeArgs(); 5160 D.setInvalidType(); 5161 } 5162 5163 // Make sure the destructor isn't variadic. 5164 if (FTI.isVariadic) { 5165 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5166 D.setInvalidType(); 5167 } 5168 5169 // Rebuild the function type "R" without any type qualifiers or 5170 // parameters (in case any of the errors above fired) and with 5171 // "void" as the return type, since destructors don't have return 5172 // types. 5173 if (!D.isInvalidType()) 5174 return R; 5175 5176 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5177 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5178 EPI.Variadic = false; 5179 EPI.TypeQuals = 0; 5180 EPI.RefQualifier = RQ_None; 5181 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5182} 5183 5184/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5185/// well-formednes of the conversion function declarator @p D with 5186/// type @p R. If there are any errors in the declarator, this routine 5187/// will emit diagnostics and return true. Otherwise, it will return 5188/// false. Either way, the type @p R will be updated to reflect a 5189/// well-formed type for the conversion operator. 5190void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5191 StorageClass& SC) { 5192 // C++ [class.conv.fct]p1: 5193 // Neither parameter types nor return type can be specified. The 5194 // type of a conversion function (8.3.5) is "function taking no 5195 // parameter returning conversion-type-id." 5196 if (SC == SC_Static) { 5197 if (!D.isInvalidType()) 5198 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5199 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5200 << SourceRange(D.getIdentifierLoc()); 5201 D.setInvalidType(); 5202 SC = SC_None; 5203 } 5204 5205 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5206 5207 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5208 // Conversion functions don't have return types, but the parser will 5209 // happily parse something like: 5210 // 5211 // class X { 5212 // float operator bool(); 5213 // }; 5214 // 5215 // The return type will be changed later anyway. 5216 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5217 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5218 << SourceRange(D.getIdentifierLoc()); 5219 D.setInvalidType(); 5220 } 5221 5222 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5223 5224 // Make sure we don't have any parameters. 5225 if (Proto->getNumArgs() > 0) { 5226 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5227 5228 // Delete the parameters. 5229 D.getFunctionTypeInfo().freeArgs(); 5230 D.setInvalidType(); 5231 } else if (Proto->isVariadic()) { 5232 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5233 D.setInvalidType(); 5234 } 5235 5236 // Diagnose "&operator bool()" and other such nonsense. This 5237 // is actually a gcc extension which we don't support. 5238 if (Proto->getResultType() != ConvType) { 5239 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5240 << Proto->getResultType(); 5241 D.setInvalidType(); 5242 ConvType = Proto->getResultType(); 5243 } 5244 5245 // C++ [class.conv.fct]p4: 5246 // The conversion-type-id shall not represent a function type nor 5247 // an array type. 5248 if (ConvType->isArrayType()) { 5249 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5250 ConvType = Context.getPointerType(ConvType); 5251 D.setInvalidType(); 5252 } else if (ConvType->isFunctionType()) { 5253 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5254 ConvType = Context.getPointerType(ConvType); 5255 D.setInvalidType(); 5256 } 5257 5258 // Rebuild the function type "R" without any parameters (in case any 5259 // of the errors above fired) and with the conversion type as the 5260 // return type. 5261 if (D.isInvalidType()) 5262 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5263 5264 // C++0x explicit conversion operators. 5265 if (D.getDeclSpec().isExplicitSpecified()) 5266 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5267 getLangOptions().CPlusPlus0x ? 5268 diag::warn_cxx98_compat_explicit_conversion_functions : 5269 diag::ext_explicit_conversion_functions) 5270 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5271} 5272 5273/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5274/// the declaration of the given C++ conversion function. This routine 5275/// is responsible for recording the conversion function in the C++ 5276/// class, if possible. 5277Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5278 assert(Conversion && "Expected to receive a conversion function declaration"); 5279 5280 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5281 5282 // Make sure we aren't redeclaring the conversion function. 5283 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5284 5285 // C++ [class.conv.fct]p1: 5286 // [...] A conversion function is never used to convert a 5287 // (possibly cv-qualified) object to the (possibly cv-qualified) 5288 // same object type (or a reference to it), to a (possibly 5289 // cv-qualified) base class of that type (or a reference to it), 5290 // or to (possibly cv-qualified) void. 5291 // FIXME: Suppress this warning if the conversion function ends up being a 5292 // virtual function that overrides a virtual function in a base class. 5293 QualType ClassType 5294 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5295 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5296 ConvType = ConvTypeRef->getPointeeType(); 5297 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5298 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5299 /* Suppress diagnostics for instantiations. */; 5300 else if (ConvType->isRecordType()) { 5301 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5302 if (ConvType == ClassType) 5303 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5304 << ClassType; 5305 else if (IsDerivedFrom(ClassType, ConvType)) 5306 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5307 << ClassType << ConvType; 5308 } else if (ConvType->isVoidType()) { 5309 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5310 << ClassType << ConvType; 5311 } 5312 5313 if (FunctionTemplateDecl *ConversionTemplate 5314 = Conversion->getDescribedFunctionTemplate()) 5315 return ConversionTemplate; 5316 5317 return Conversion; 5318} 5319 5320//===----------------------------------------------------------------------===// 5321// Namespace Handling 5322//===----------------------------------------------------------------------===// 5323 5324 5325 5326/// ActOnStartNamespaceDef - This is called at the start of a namespace 5327/// definition. 5328Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5329 SourceLocation InlineLoc, 5330 SourceLocation NamespaceLoc, 5331 SourceLocation IdentLoc, 5332 IdentifierInfo *II, 5333 SourceLocation LBrace, 5334 AttributeList *AttrList) { 5335 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5336 // For anonymous namespace, take the location of the left brace. 5337 SourceLocation Loc = II ? IdentLoc : LBrace; 5338 bool IsInline = InlineLoc.isValid(); 5339 bool IsInvalid = false; 5340 bool IsStd = false; 5341 bool AddToKnown = false; 5342 Scope *DeclRegionScope = NamespcScope->getParent(); 5343 5344 NamespaceDecl *PrevNS = 0; 5345 if (II) { 5346 // C++ [namespace.def]p2: 5347 // The identifier in an original-namespace-definition shall not 5348 // have been previously defined in the declarative region in 5349 // which the original-namespace-definition appears. The 5350 // identifier in an original-namespace-definition is the name of 5351 // the namespace. Subsequently in that declarative region, it is 5352 // treated as an original-namespace-name. 5353 // 5354 // Since namespace names are unique in their scope, and we don't 5355 // look through using directives, just look for any ordinary names. 5356 5357 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5358 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5359 Decl::IDNS_Namespace; 5360 NamedDecl *PrevDecl = 0; 5361 for (DeclContext::lookup_result R 5362 = CurContext->getRedeclContext()->lookup(II); 5363 R.first != R.second; ++R.first) { 5364 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5365 PrevDecl = *R.first; 5366 break; 5367 } 5368 } 5369 5370 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5371 5372 if (PrevNS) { 5373 // This is an extended namespace definition. 5374 if (IsInline != PrevNS->isInline()) { 5375 // inline-ness must match 5376 if (PrevNS->isInline()) { 5377 // The user probably just forgot the 'inline', so suggest that it 5378 // be added back. 5379 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5380 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5381 } else { 5382 Diag(Loc, diag::err_inline_namespace_mismatch) 5383 << IsInline; 5384 } 5385 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5386 5387 IsInline = PrevNS->isInline(); 5388 } 5389 } else if (PrevDecl) { 5390 // This is an invalid name redefinition. 5391 Diag(Loc, diag::err_redefinition_different_kind) 5392 << II; 5393 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5394 IsInvalid = true; 5395 // Continue on to push Namespc as current DeclContext and return it. 5396 } else if (II->isStr("std") && 5397 CurContext->getRedeclContext()->isTranslationUnit()) { 5398 // This is the first "real" definition of the namespace "std", so update 5399 // our cache of the "std" namespace to point at this definition. 5400 PrevNS = getStdNamespace(); 5401 IsStd = true; 5402 AddToKnown = !IsInline; 5403 } else { 5404 // We've seen this namespace for the first time. 5405 AddToKnown = !IsInline; 5406 } 5407 } else { 5408 // Anonymous namespaces. 5409 5410 // Determine whether the parent already has an anonymous namespace. 5411 DeclContext *Parent = CurContext->getRedeclContext(); 5412 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5413 PrevNS = TU->getAnonymousNamespace(); 5414 } else { 5415 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5416 PrevNS = ND->getAnonymousNamespace(); 5417 } 5418 5419 if (PrevNS && IsInline != PrevNS->isInline()) { 5420 // inline-ness must match 5421 Diag(Loc, diag::err_inline_namespace_mismatch) 5422 << IsInline; 5423 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5424 5425 // Recover by ignoring the new namespace's inline status. 5426 IsInline = PrevNS->isInline(); 5427 } 5428 } 5429 5430 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5431 StartLoc, Loc, II, PrevNS); 5432 if (IsInvalid) 5433 Namespc->setInvalidDecl(); 5434 5435 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5436 5437 // FIXME: Should we be merging attributes? 5438 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5439 PushNamespaceVisibilityAttr(Attr, Loc); 5440 5441 if (IsStd) 5442 StdNamespace = Namespc; 5443 if (AddToKnown) 5444 KnownNamespaces[Namespc] = false; 5445 5446 if (II) { 5447 PushOnScopeChains(Namespc, DeclRegionScope); 5448 } else { 5449 // Link the anonymous namespace into its parent. 5450 DeclContext *Parent = CurContext->getRedeclContext(); 5451 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5452 TU->setAnonymousNamespace(Namespc); 5453 } else { 5454 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5455 } 5456 5457 CurContext->addDecl(Namespc); 5458 5459 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5460 // behaves as if it were replaced by 5461 // namespace unique { /* empty body */ } 5462 // using namespace unique; 5463 // namespace unique { namespace-body } 5464 // where all occurrences of 'unique' in a translation unit are 5465 // replaced by the same identifier and this identifier differs 5466 // from all other identifiers in the entire program. 5467 5468 // We just create the namespace with an empty name and then add an 5469 // implicit using declaration, just like the standard suggests. 5470 // 5471 // CodeGen enforces the "universally unique" aspect by giving all 5472 // declarations semantically contained within an anonymous 5473 // namespace internal linkage. 5474 5475 if (!PrevNS) { 5476 UsingDirectiveDecl* UD 5477 = UsingDirectiveDecl::Create(Context, CurContext, 5478 /* 'using' */ LBrace, 5479 /* 'namespace' */ SourceLocation(), 5480 /* qualifier */ NestedNameSpecifierLoc(), 5481 /* identifier */ SourceLocation(), 5482 Namespc, 5483 /* Ancestor */ CurContext); 5484 UD->setImplicit(); 5485 CurContext->addDecl(UD); 5486 } 5487 } 5488 5489 // Although we could have an invalid decl (i.e. the namespace name is a 5490 // redefinition), push it as current DeclContext and try to continue parsing. 5491 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5492 // for the namespace has the declarations that showed up in that particular 5493 // namespace definition. 5494 PushDeclContext(NamespcScope, Namespc); 5495 return Namespc; 5496} 5497 5498/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5499/// is a namespace alias, returns the namespace it points to. 5500static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5501 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5502 return AD->getNamespace(); 5503 return dyn_cast_or_null<NamespaceDecl>(D); 5504} 5505 5506/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5507/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5508void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5509 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5510 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5511 Namespc->setRBraceLoc(RBrace); 5512 PopDeclContext(); 5513 if (Namespc->hasAttr<VisibilityAttr>()) 5514 PopPragmaVisibility(true, RBrace); 5515} 5516 5517CXXRecordDecl *Sema::getStdBadAlloc() const { 5518 return cast_or_null<CXXRecordDecl>( 5519 StdBadAlloc.get(Context.getExternalSource())); 5520} 5521 5522NamespaceDecl *Sema::getStdNamespace() const { 5523 return cast_or_null<NamespaceDecl>( 5524 StdNamespace.get(Context.getExternalSource())); 5525} 5526 5527/// \brief Retrieve the special "std" namespace, which may require us to 5528/// implicitly define the namespace. 5529NamespaceDecl *Sema::getOrCreateStdNamespace() { 5530 if (!StdNamespace) { 5531 // The "std" namespace has not yet been defined, so build one implicitly. 5532 StdNamespace = NamespaceDecl::Create(Context, 5533 Context.getTranslationUnitDecl(), 5534 /*Inline=*/false, 5535 SourceLocation(), SourceLocation(), 5536 &PP.getIdentifierTable().get("std"), 5537 /*PrevDecl=*/0); 5538 getStdNamespace()->setImplicit(true); 5539 } 5540 5541 return getStdNamespace(); 5542} 5543 5544bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5545 assert(getLangOptions().CPlusPlus && 5546 "Looking for std::initializer_list outside of C++."); 5547 5548 // We're looking for implicit instantiations of 5549 // template <typename E> class std::initializer_list. 5550 5551 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5552 return false; 5553 5554 ClassTemplateDecl *Template = 0; 5555 const TemplateArgument *Arguments = 0; 5556 5557 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5558 5559 ClassTemplateSpecializationDecl *Specialization = 5560 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5561 if (!Specialization) 5562 return false; 5563 5564 Template = Specialization->getSpecializedTemplate(); 5565 Arguments = Specialization->getTemplateArgs().data(); 5566 } else if (const TemplateSpecializationType *TST = 5567 Ty->getAs<TemplateSpecializationType>()) { 5568 Template = dyn_cast_or_null<ClassTemplateDecl>( 5569 TST->getTemplateName().getAsTemplateDecl()); 5570 Arguments = TST->getArgs(); 5571 } 5572 if (!Template) 5573 return false; 5574 5575 if (!StdInitializerList) { 5576 // Haven't recognized std::initializer_list yet, maybe this is it. 5577 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5578 if (TemplateClass->getIdentifier() != 5579 &PP.getIdentifierTable().get("initializer_list") || 5580 !getStdNamespace()->InEnclosingNamespaceSetOf( 5581 TemplateClass->getDeclContext())) 5582 return false; 5583 // This is a template called std::initializer_list, but is it the right 5584 // template? 5585 TemplateParameterList *Params = Template->getTemplateParameters(); 5586 if (Params->getMinRequiredArguments() != 1) 5587 return false; 5588 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5589 return false; 5590 5591 // It's the right template. 5592 StdInitializerList = Template; 5593 } 5594 5595 if (Template != StdInitializerList) 5596 return false; 5597 5598 // This is an instance of std::initializer_list. Find the argument type. 5599 if (Element) 5600 *Element = Arguments[0].getAsType(); 5601 return true; 5602} 5603 5604static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5605 NamespaceDecl *Std = S.getStdNamespace(); 5606 if (!Std) { 5607 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5608 return 0; 5609 } 5610 5611 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5612 Loc, Sema::LookupOrdinaryName); 5613 if (!S.LookupQualifiedName(Result, Std)) { 5614 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5615 return 0; 5616 } 5617 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5618 if (!Template) { 5619 Result.suppressDiagnostics(); 5620 // We found something weird. Complain about the first thing we found. 5621 NamedDecl *Found = *Result.begin(); 5622 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5623 return 0; 5624 } 5625 5626 // We found some template called std::initializer_list. Now verify that it's 5627 // correct. 5628 TemplateParameterList *Params = Template->getTemplateParameters(); 5629 if (Params->getMinRequiredArguments() != 1 || 5630 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5631 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5632 return 0; 5633 } 5634 5635 return Template; 5636} 5637 5638QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5639 if (!StdInitializerList) { 5640 StdInitializerList = LookupStdInitializerList(*this, Loc); 5641 if (!StdInitializerList) 5642 return QualType(); 5643 } 5644 5645 TemplateArgumentListInfo Args(Loc, Loc); 5646 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5647 Context.getTrivialTypeSourceInfo(Element, 5648 Loc))); 5649 return Context.getCanonicalType( 5650 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5651} 5652 5653bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5654 // C++ [dcl.init.list]p2: 5655 // A constructor is an initializer-list constructor if its first parameter 5656 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5657 // std::initializer_list<E> for some type E, and either there are no other 5658 // parameters or else all other parameters have default arguments. 5659 if (Ctor->getNumParams() < 1 || 5660 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5661 return false; 5662 5663 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5664 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5665 ArgType = RT->getPointeeType().getUnqualifiedType(); 5666 5667 return isStdInitializerList(ArgType, 0); 5668} 5669 5670/// \brief Determine whether a using statement is in a context where it will be 5671/// apply in all contexts. 5672static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5673 switch (CurContext->getDeclKind()) { 5674 case Decl::TranslationUnit: 5675 return true; 5676 case Decl::LinkageSpec: 5677 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5678 default: 5679 return false; 5680 } 5681} 5682 5683namespace { 5684 5685// Callback to only accept typo corrections that are namespaces. 5686class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5687 public: 5688 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5689 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5690 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5691 } 5692 return false; 5693 } 5694}; 5695 5696} 5697 5698static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5699 CXXScopeSpec &SS, 5700 SourceLocation IdentLoc, 5701 IdentifierInfo *Ident) { 5702 NamespaceValidatorCCC Validator; 5703 R.clear(); 5704 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5705 R.getLookupKind(), Sc, &SS, 5706 Validator)) { 5707 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5708 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5709 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5710 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5711 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5712 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5713 else 5714 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5715 << Ident << CorrectedQuotedStr 5716 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5717 5718 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5719 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5720 5721 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5722 R.addDecl(Corrected.getCorrectionDecl()); 5723 return true; 5724 } 5725 return false; 5726} 5727 5728Decl *Sema::ActOnUsingDirective(Scope *S, 5729 SourceLocation UsingLoc, 5730 SourceLocation NamespcLoc, 5731 CXXScopeSpec &SS, 5732 SourceLocation IdentLoc, 5733 IdentifierInfo *NamespcName, 5734 AttributeList *AttrList) { 5735 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5736 assert(NamespcName && "Invalid NamespcName."); 5737 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5738 5739 // This can only happen along a recovery path. 5740 while (S->getFlags() & Scope::TemplateParamScope) 5741 S = S->getParent(); 5742 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5743 5744 UsingDirectiveDecl *UDir = 0; 5745 NestedNameSpecifier *Qualifier = 0; 5746 if (SS.isSet()) 5747 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5748 5749 // Lookup namespace name. 5750 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5751 LookupParsedName(R, S, &SS); 5752 if (R.isAmbiguous()) 5753 return 0; 5754 5755 if (R.empty()) { 5756 R.clear(); 5757 // Allow "using namespace std;" or "using namespace ::std;" even if 5758 // "std" hasn't been defined yet, for GCC compatibility. 5759 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5760 NamespcName->isStr("std")) { 5761 Diag(IdentLoc, diag::ext_using_undefined_std); 5762 R.addDecl(getOrCreateStdNamespace()); 5763 R.resolveKind(); 5764 } 5765 // Otherwise, attempt typo correction. 5766 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5767 } 5768 5769 if (!R.empty()) { 5770 NamedDecl *Named = R.getFoundDecl(); 5771 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5772 && "expected namespace decl"); 5773 // C++ [namespace.udir]p1: 5774 // A using-directive specifies that the names in the nominated 5775 // namespace can be used in the scope in which the 5776 // using-directive appears after the using-directive. During 5777 // unqualified name lookup (3.4.1), the names appear as if they 5778 // were declared in the nearest enclosing namespace which 5779 // contains both the using-directive and the nominated 5780 // namespace. [Note: in this context, "contains" means "contains 5781 // directly or indirectly". ] 5782 5783 // Find enclosing context containing both using-directive and 5784 // nominated namespace. 5785 NamespaceDecl *NS = getNamespaceDecl(Named); 5786 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5787 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5788 CommonAncestor = CommonAncestor->getParent(); 5789 5790 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5791 SS.getWithLocInContext(Context), 5792 IdentLoc, Named, CommonAncestor); 5793 5794 if (IsUsingDirectiveInToplevelContext(CurContext) && 5795 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5796 Diag(IdentLoc, diag::warn_using_directive_in_header); 5797 } 5798 5799 PushUsingDirective(S, UDir); 5800 } else { 5801 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5802 } 5803 5804 // FIXME: We ignore attributes for now. 5805 return UDir; 5806} 5807 5808void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5809 // If scope has associated entity, then using directive is at namespace 5810 // or translation unit scope. We add UsingDirectiveDecls, into 5811 // it's lookup structure. 5812 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5813 Ctx->addDecl(UDir); 5814 else 5815 // Otherwise it is block-sope. using-directives will affect lookup 5816 // only to the end of scope. 5817 S->PushUsingDirective(UDir); 5818} 5819 5820 5821Decl *Sema::ActOnUsingDeclaration(Scope *S, 5822 AccessSpecifier AS, 5823 bool HasUsingKeyword, 5824 SourceLocation UsingLoc, 5825 CXXScopeSpec &SS, 5826 UnqualifiedId &Name, 5827 AttributeList *AttrList, 5828 bool IsTypeName, 5829 SourceLocation TypenameLoc) { 5830 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5831 5832 switch (Name.getKind()) { 5833 case UnqualifiedId::IK_ImplicitSelfParam: 5834 case UnqualifiedId::IK_Identifier: 5835 case UnqualifiedId::IK_OperatorFunctionId: 5836 case UnqualifiedId::IK_LiteralOperatorId: 5837 case UnqualifiedId::IK_ConversionFunctionId: 5838 break; 5839 5840 case UnqualifiedId::IK_ConstructorName: 5841 case UnqualifiedId::IK_ConstructorTemplateId: 5842 // C++0x inherited constructors. 5843 Diag(Name.getSourceRange().getBegin(), 5844 getLangOptions().CPlusPlus0x ? 5845 diag::warn_cxx98_compat_using_decl_constructor : 5846 diag::err_using_decl_constructor) 5847 << SS.getRange(); 5848 5849 if (getLangOptions().CPlusPlus0x) break; 5850 5851 return 0; 5852 5853 case UnqualifiedId::IK_DestructorName: 5854 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5855 << SS.getRange(); 5856 return 0; 5857 5858 case UnqualifiedId::IK_TemplateId: 5859 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5860 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5861 return 0; 5862 } 5863 5864 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5865 DeclarationName TargetName = TargetNameInfo.getName(); 5866 if (!TargetName) 5867 return 0; 5868 5869 // Warn about using declarations. 5870 // TODO: store that the declaration was written without 'using' and 5871 // talk about access decls instead of using decls in the 5872 // diagnostics. 5873 if (!HasUsingKeyword) { 5874 UsingLoc = Name.getSourceRange().getBegin(); 5875 5876 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5877 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5878 } 5879 5880 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5881 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5882 return 0; 5883 5884 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5885 TargetNameInfo, AttrList, 5886 /* IsInstantiation */ false, 5887 IsTypeName, TypenameLoc); 5888 if (UD) 5889 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5890 5891 return UD; 5892} 5893 5894/// \brief Determine whether a using declaration considers the given 5895/// declarations as "equivalent", e.g., if they are redeclarations of 5896/// the same entity or are both typedefs of the same type. 5897static bool 5898IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5899 bool &SuppressRedeclaration) { 5900 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5901 SuppressRedeclaration = false; 5902 return true; 5903 } 5904 5905 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5906 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5907 SuppressRedeclaration = true; 5908 return Context.hasSameType(TD1->getUnderlyingType(), 5909 TD2->getUnderlyingType()); 5910 } 5911 5912 return false; 5913} 5914 5915 5916/// Determines whether to create a using shadow decl for a particular 5917/// decl, given the set of decls existing prior to this using lookup. 5918bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5919 const LookupResult &Previous) { 5920 // Diagnose finding a decl which is not from a base class of the 5921 // current class. We do this now because there are cases where this 5922 // function will silently decide not to build a shadow decl, which 5923 // will pre-empt further diagnostics. 5924 // 5925 // We don't need to do this in C++0x because we do the check once on 5926 // the qualifier. 5927 // 5928 // FIXME: diagnose the following if we care enough: 5929 // struct A { int foo; }; 5930 // struct B : A { using A::foo; }; 5931 // template <class T> struct C : A {}; 5932 // template <class T> struct D : C<T> { using B::foo; } // <--- 5933 // This is invalid (during instantiation) in C++03 because B::foo 5934 // resolves to the using decl in B, which is not a base class of D<T>. 5935 // We can't diagnose it immediately because C<T> is an unknown 5936 // specialization. The UsingShadowDecl in D<T> then points directly 5937 // to A::foo, which will look well-formed when we instantiate. 5938 // The right solution is to not collapse the shadow-decl chain. 5939 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5940 DeclContext *OrigDC = Orig->getDeclContext(); 5941 5942 // Handle enums and anonymous structs. 5943 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5944 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5945 while (OrigRec->isAnonymousStructOrUnion()) 5946 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5947 5948 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5949 if (OrigDC == CurContext) { 5950 Diag(Using->getLocation(), 5951 diag::err_using_decl_nested_name_specifier_is_current_class) 5952 << Using->getQualifierLoc().getSourceRange(); 5953 Diag(Orig->getLocation(), diag::note_using_decl_target); 5954 return true; 5955 } 5956 5957 Diag(Using->getQualifierLoc().getBeginLoc(), 5958 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5959 << Using->getQualifier() 5960 << cast<CXXRecordDecl>(CurContext) 5961 << Using->getQualifierLoc().getSourceRange(); 5962 Diag(Orig->getLocation(), diag::note_using_decl_target); 5963 return true; 5964 } 5965 } 5966 5967 if (Previous.empty()) return false; 5968 5969 NamedDecl *Target = Orig; 5970 if (isa<UsingShadowDecl>(Target)) 5971 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5972 5973 // If the target happens to be one of the previous declarations, we 5974 // don't have a conflict. 5975 // 5976 // FIXME: but we might be increasing its access, in which case we 5977 // should redeclare it. 5978 NamedDecl *NonTag = 0, *Tag = 0; 5979 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5980 I != E; ++I) { 5981 NamedDecl *D = (*I)->getUnderlyingDecl(); 5982 bool Result; 5983 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5984 return Result; 5985 5986 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5987 } 5988 5989 if (Target->isFunctionOrFunctionTemplate()) { 5990 FunctionDecl *FD; 5991 if (isa<FunctionTemplateDecl>(Target)) 5992 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5993 else 5994 FD = cast<FunctionDecl>(Target); 5995 5996 NamedDecl *OldDecl = 0; 5997 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5998 case Ovl_Overload: 5999 return false; 6000 6001 case Ovl_NonFunction: 6002 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6003 break; 6004 6005 // We found a decl with the exact signature. 6006 case Ovl_Match: 6007 // If we're in a record, we want to hide the target, so we 6008 // return true (without a diagnostic) to tell the caller not to 6009 // build a shadow decl. 6010 if (CurContext->isRecord()) 6011 return true; 6012 6013 // If we're not in a record, this is an error. 6014 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6015 break; 6016 } 6017 6018 Diag(Target->getLocation(), diag::note_using_decl_target); 6019 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6020 return true; 6021 } 6022 6023 // Target is not a function. 6024 6025 if (isa<TagDecl>(Target)) { 6026 // No conflict between a tag and a non-tag. 6027 if (!Tag) return false; 6028 6029 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6030 Diag(Target->getLocation(), diag::note_using_decl_target); 6031 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6032 return true; 6033 } 6034 6035 // No conflict between a tag and a non-tag. 6036 if (!NonTag) return false; 6037 6038 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6039 Diag(Target->getLocation(), diag::note_using_decl_target); 6040 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6041 return true; 6042} 6043 6044/// Builds a shadow declaration corresponding to a 'using' declaration. 6045UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6046 UsingDecl *UD, 6047 NamedDecl *Orig) { 6048 6049 // If we resolved to another shadow declaration, just coalesce them. 6050 NamedDecl *Target = Orig; 6051 if (isa<UsingShadowDecl>(Target)) { 6052 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6053 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6054 } 6055 6056 UsingShadowDecl *Shadow 6057 = UsingShadowDecl::Create(Context, CurContext, 6058 UD->getLocation(), UD, Target); 6059 UD->addShadowDecl(Shadow); 6060 6061 Shadow->setAccess(UD->getAccess()); 6062 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6063 Shadow->setInvalidDecl(); 6064 6065 if (S) 6066 PushOnScopeChains(Shadow, S); 6067 else 6068 CurContext->addDecl(Shadow); 6069 6070 6071 return Shadow; 6072} 6073 6074/// Hides a using shadow declaration. This is required by the current 6075/// using-decl implementation when a resolvable using declaration in a 6076/// class is followed by a declaration which would hide or override 6077/// one or more of the using decl's targets; for example: 6078/// 6079/// struct Base { void foo(int); }; 6080/// struct Derived : Base { 6081/// using Base::foo; 6082/// void foo(int); 6083/// }; 6084/// 6085/// The governing language is C++03 [namespace.udecl]p12: 6086/// 6087/// When a using-declaration brings names from a base class into a 6088/// derived class scope, member functions in the derived class 6089/// override and/or hide member functions with the same name and 6090/// parameter types in a base class (rather than conflicting). 6091/// 6092/// There are two ways to implement this: 6093/// (1) optimistically create shadow decls when they're not hidden 6094/// by existing declarations, or 6095/// (2) don't create any shadow decls (or at least don't make them 6096/// visible) until we've fully parsed/instantiated the class. 6097/// The problem with (1) is that we might have to retroactively remove 6098/// a shadow decl, which requires several O(n) operations because the 6099/// decl structures are (very reasonably) not designed for removal. 6100/// (2) avoids this but is very fiddly and phase-dependent. 6101void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6102 if (Shadow->getDeclName().getNameKind() == 6103 DeclarationName::CXXConversionFunctionName) 6104 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6105 6106 // Remove it from the DeclContext... 6107 Shadow->getDeclContext()->removeDecl(Shadow); 6108 6109 // ...and the scope, if applicable... 6110 if (S) { 6111 S->RemoveDecl(Shadow); 6112 IdResolver.RemoveDecl(Shadow); 6113 } 6114 6115 // ...and the using decl. 6116 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6117 6118 // TODO: complain somehow if Shadow was used. It shouldn't 6119 // be possible for this to happen, because...? 6120} 6121 6122/// Builds a using declaration. 6123/// 6124/// \param IsInstantiation - Whether this call arises from an 6125/// instantiation of an unresolved using declaration. We treat 6126/// the lookup differently for these declarations. 6127NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6128 SourceLocation UsingLoc, 6129 CXXScopeSpec &SS, 6130 const DeclarationNameInfo &NameInfo, 6131 AttributeList *AttrList, 6132 bool IsInstantiation, 6133 bool IsTypeName, 6134 SourceLocation TypenameLoc) { 6135 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6136 SourceLocation IdentLoc = NameInfo.getLoc(); 6137 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6138 6139 // FIXME: We ignore attributes for now. 6140 6141 if (SS.isEmpty()) { 6142 Diag(IdentLoc, diag::err_using_requires_qualname); 6143 return 0; 6144 } 6145 6146 // Do the redeclaration lookup in the current scope. 6147 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6148 ForRedeclaration); 6149 Previous.setHideTags(false); 6150 if (S) { 6151 LookupName(Previous, S); 6152 6153 // It is really dumb that we have to do this. 6154 LookupResult::Filter F = Previous.makeFilter(); 6155 while (F.hasNext()) { 6156 NamedDecl *D = F.next(); 6157 if (!isDeclInScope(D, CurContext, S)) 6158 F.erase(); 6159 } 6160 F.done(); 6161 } else { 6162 assert(IsInstantiation && "no scope in non-instantiation"); 6163 assert(CurContext->isRecord() && "scope not record in instantiation"); 6164 LookupQualifiedName(Previous, CurContext); 6165 } 6166 6167 // Check for invalid redeclarations. 6168 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6169 return 0; 6170 6171 // Check for bad qualifiers. 6172 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6173 return 0; 6174 6175 DeclContext *LookupContext = computeDeclContext(SS); 6176 NamedDecl *D; 6177 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6178 if (!LookupContext) { 6179 if (IsTypeName) { 6180 // FIXME: not all declaration name kinds are legal here 6181 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6182 UsingLoc, TypenameLoc, 6183 QualifierLoc, 6184 IdentLoc, NameInfo.getName()); 6185 } else { 6186 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6187 QualifierLoc, NameInfo); 6188 } 6189 } else { 6190 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6191 NameInfo, IsTypeName); 6192 } 6193 D->setAccess(AS); 6194 CurContext->addDecl(D); 6195 6196 if (!LookupContext) return D; 6197 UsingDecl *UD = cast<UsingDecl>(D); 6198 6199 if (RequireCompleteDeclContext(SS, LookupContext)) { 6200 UD->setInvalidDecl(); 6201 return UD; 6202 } 6203 6204 // Constructor inheriting using decls get special treatment. 6205 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6206 if (CheckInheritedConstructorUsingDecl(UD)) 6207 UD->setInvalidDecl(); 6208 return UD; 6209 } 6210 6211 // Otherwise, look up the target name. 6212 6213 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6214 6215 // Unlike most lookups, we don't always want to hide tag 6216 // declarations: tag names are visible through the using declaration 6217 // even if hidden by ordinary names, *except* in a dependent context 6218 // where it's important for the sanity of two-phase lookup. 6219 if (!IsInstantiation) 6220 R.setHideTags(false); 6221 6222 LookupQualifiedName(R, LookupContext); 6223 6224 if (R.empty()) { 6225 Diag(IdentLoc, diag::err_no_member) 6226 << NameInfo.getName() << LookupContext << SS.getRange(); 6227 UD->setInvalidDecl(); 6228 return UD; 6229 } 6230 6231 if (R.isAmbiguous()) { 6232 UD->setInvalidDecl(); 6233 return UD; 6234 } 6235 6236 if (IsTypeName) { 6237 // If we asked for a typename and got a non-type decl, error out. 6238 if (!R.getAsSingle<TypeDecl>()) { 6239 Diag(IdentLoc, diag::err_using_typename_non_type); 6240 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6241 Diag((*I)->getUnderlyingDecl()->getLocation(), 6242 diag::note_using_decl_target); 6243 UD->setInvalidDecl(); 6244 return UD; 6245 } 6246 } else { 6247 // If we asked for a non-typename and we got a type, error out, 6248 // but only if this is an instantiation of an unresolved using 6249 // decl. Otherwise just silently find the type name. 6250 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6251 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6252 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6253 UD->setInvalidDecl(); 6254 return UD; 6255 } 6256 } 6257 6258 // C++0x N2914 [namespace.udecl]p6: 6259 // A using-declaration shall not name a namespace. 6260 if (R.getAsSingle<NamespaceDecl>()) { 6261 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6262 << SS.getRange(); 6263 UD->setInvalidDecl(); 6264 return UD; 6265 } 6266 6267 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6268 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6269 BuildUsingShadowDecl(S, UD, *I); 6270 } 6271 6272 return UD; 6273} 6274 6275/// Additional checks for a using declaration referring to a constructor name. 6276bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6277 if (UD->isTypeName()) { 6278 // FIXME: Cannot specify typename when specifying constructor 6279 return true; 6280 } 6281 6282 const Type *SourceType = UD->getQualifier()->getAsType(); 6283 assert(SourceType && 6284 "Using decl naming constructor doesn't have type in scope spec."); 6285 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6286 6287 // Check whether the named type is a direct base class. 6288 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6289 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6290 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6291 BaseIt != BaseE; ++BaseIt) { 6292 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6293 if (CanonicalSourceType == BaseType) 6294 break; 6295 } 6296 6297 if (BaseIt == BaseE) { 6298 // Did not find SourceType in the bases. 6299 Diag(UD->getUsingLocation(), 6300 diag::err_using_decl_constructor_not_in_direct_base) 6301 << UD->getNameInfo().getSourceRange() 6302 << QualType(SourceType, 0) << TargetClass; 6303 return true; 6304 } 6305 6306 BaseIt->setInheritConstructors(); 6307 6308 return false; 6309} 6310 6311/// Checks that the given using declaration is not an invalid 6312/// redeclaration. Note that this is checking only for the using decl 6313/// itself, not for any ill-formedness among the UsingShadowDecls. 6314bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6315 bool isTypeName, 6316 const CXXScopeSpec &SS, 6317 SourceLocation NameLoc, 6318 const LookupResult &Prev) { 6319 // C++03 [namespace.udecl]p8: 6320 // C++0x [namespace.udecl]p10: 6321 // A using-declaration is a declaration and can therefore be used 6322 // repeatedly where (and only where) multiple declarations are 6323 // allowed. 6324 // 6325 // That's in non-member contexts. 6326 if (!CurContext->getRedeclContext()->isRecord()) 6327 return false; 6328 6329 NestedNameSpecifier *Qual 6330 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6331 6332 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6333 NamedDecl *D = *I; 6334 6335 bool DTypename; 6336 NestedNameSpecifier *DQual; 6337 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6338 DTypename = UD->isTypeName(); 6339 DQual = UD->getQualifier(); 6340 } else if (UnresolvedUsingValueDecl *UD 6341 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6342 DTypename = false; 6343 DQual = UD->getQualifier(); 6344 } else if (UnresolvedUsingTypenameDecl *UD 6345 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6346 DTypename = true; 6347 DQual = UD->getQualifier(); 6348 } else continue; 6349 6350 // using decls differ if one says 'typename' and the other doesn't. 6351 // FIXME: non-dependent using decls? 6352 if (isTypeName != DTypename) continue; 6353 6354 // using decls differ if they name different scopes (but note that 6355 // template instantiation can cause this check to trigger when it 6356 // didn't before instantiation). 6357 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6358 Context.getCanonicalNestedNameSpecifier(DQual)) 6359 continue; 6360 6361 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6362 Diag(D->getLocation(), diag::note_using_decl) << 1; 6363 return true; 6364 } 6365 6366 return false; 6367} 6368 6369 6370/// Checks that the given nested-name qualifier used in a using decl 6371/// in the current context is appropriately related to the current 6372/// scope. If an error is found, diagnoses it and returns true. 6373bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6374 const CXXScopeSpec &SS, 6375 SourceLocation NameLoc) { 6376 DeclContext *NamedContext = computeDeclContext(SS); 6377 6378 if (!CurContext->isRecord()) { 6379 // C++03 [namespace.udecl]p3: 6380 // C++0x [namespace.udecl]p8: 6381 // A using-declaration for a class member shall be a member-declaration. 6382 6383 // If we weren't able to compute a valid scope, it must be a 6384 // dependent class scope. 6385 if (!NamedContext || NamedContext->isRecord()) { 6386 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6387 << SS.getRange(); 6388 return true; 6389 } 6390 6391 // Otherwise, everything is known to be fine. 6392 return false; 6393 } 6394 6395 // The current scope is a record. 6396 6397 // If the named context is dependent, we can't decide much. 6398 if (!NamedContext) { 6399 // FIXME: in C++0x, we can diagnose if we can prove that the 6400 // nested-name-specifier does not refer to a base class, which is 6401 // still possible in some cases. 6402 6403 // Otherwise we have to conservatively report that things might be 6404 // okay. 6405 return false; 6406 } 6407 6408 if (!NamedContext->isRecord()) { 6409 // Ideally this would point at the last name in the specifier, 6410 // but we don't have that level of source info. 6411 Diag(SS.getRange().getBegin(), 6412 diag::err_using_decl_nested_name_specifier_is_not_class) 6413 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6414 return true; 6415 } 6416 6417 if (!NamedContext->isDependentContext() && 6418 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6419 return true; 6420 6421 if (getLangOptions().CPlusPlus0x) { 6422 // C++0x [namespace.udecl]p3: 6423 // In a using-declaration used as a member-declaration, the 6424 // nested-name-specifier shall name a base class of the class 6425 // being defined. 6426 6427 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6428 cast<CXXRecordDecl>(NamedContext))) { 6429 if (CurContext == NamedContext) { 6430 Diag(NameLoc, 6431 diag::err_using_decl_nested_name_specifier_is_current_class) 6432 << SS.getRange(); 6433 return true; 6434 } 6435 6436 Diag(SS.getRange().getBegin(), 6437 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6438 << (NestedNameSpecifier*) SS.getScopeRep() 6439 << cast<CXXRecordDecl>(CurContext) 6440 << SS.getRange(); 6441 return true; 6442 } 6443 6444 return false; 6445 } 6446 6447 // C++03 [namespace.udecl]p4: 6448 // A using-declaration used as a member-declaration shall refer 6449 // to a member of a base class of the class being defined [etc.]. 6450 6451 // Salient point: SS doesn't have to name a base class as long as 6452 // lookup only finds members from base classes. Therefore we can 6453 // diagnose here only if we can prove that that can't happen, 6454 // i.e. if the class hierarchies provably don't intersect. 6455 6456 // TODO: it would be nice if "definitely valid" results were cached 6457 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6458 // need to be repeated. 6459 6460 struct UserData { 6461 llvm::DenseSet<const CXXRecordDecl*> Bases; 6462 6463 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6464 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6465 Data->Bases.insert(Base); 6466 return true; 6467 } 6468 6469 bool hasDependentBases(const CXXRecordDecl *Class) { 6470 return !Class->forallBases(collect, this); 6471 } 6472 6473 /// Returns true if the base is dependent or is one of the 6474 /// accumulated base classes. 6475 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6476 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6477 return !Data->Bases.count(Base); 6478 } 6479 6480 bool mightShareBases(const CXXRecordDecl *Class) { 6481 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6482 } 6483 }; 6484 6485 UserData Data; 6486 6487 // Returns false if we find a dependent base. 6488 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6489 return false; 6490 6491 // Returns false if the class has a dependent base or if it or one 6492 // of its bases is present in the base set of the current context. 6493 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6494 return false; 6495 6496 Diag(SS.getRange().getBegin(), 6497 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6498 << (NestedNameSpecifier*) SS.getScopeRep() 6499 << cast<CXXRecordDecl>(CurContext) 6500 << SS.getRange(); 6501 6502 return true; 6503} 6504 6505Decl *Sema::ActOnAliasDeclaration(Scope *S, 6506 AccessSpecifier AS, 6507 MultiTemplateParamsArg TemplateParamLists, 6508 SourceLocation UsingLoc, 6509 UnqualifiedId &Name, 6510 TypeResult Type) { 6511 // Skip up to the relevant declaration scope. 6512 while (S->getFlags() & Scope::TemplateParamScope) 6513 S = S->getParent(); 6514 assert((S->getFlags() & Scope::DeclScope) && 6515 "got alias-declaration outside of declaration scope"); 6516 6517 if (Type.isInvalid()) 6518 return 0; 6519 6520 bool Invalid = false; 6521 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6522 TypeSourceInfo *TInfo = 0; 6523 GetTypeFromParser(Type.get(), &TInfo); 6524 6525 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6526 return 0; 6527 6528 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6529 UPPC_DeclarationType)) { 6530 Invalid = true; 6531 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6532 TInfo->getTypeLoc().getBeginLoc()); 6533 } 6534 6535 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6536 LookupName(Previous, S); 6537 6538 // Warn about shadowing the name of a template parameter. 6539 if (Previous.isSingleResult() && 6540 Previous.getFoundDecl()->isTemplateParameter()) { 6541 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6542 Previous.clear(); 6543 } 6544 6545 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6546 "name in alias declaration must be an identifier"); 6547 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6548 Name.StartLocation, 6549 Name.Identifier, TInfo); 6550 6551 NewTD->setAccess(AS); 6552 6553 if (Invalid) 6554 NewTD->setInvalidDecl(); 6555 6556 CheckTypedefForVariablyModifiedType(S, NewTD); 6557 Invalid |= NewTD->isInvalidDecl(); 6558 6559 bool Redeclaration = false; 6560 6561 NamedDecl *NewND; 6562 if (TemplateParamLists.size()) { 6563 TypeAliasTemplateDecl *OldDecl = 0; 6564 TemplateParameterList *OldTemplateParams = 0; 6565 6566 if (TemplateParamLists.size() != 1) { 6567 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6568 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6569 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6570 } 6571 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6572 6573 // Only consider previous declarations in the same scope. 6574 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6575 /*ExplicitInstantiationOrSpecialization*/false); 6576 if (!Previous.empty()) { 6577 Redeclaration = true; 6578 6579 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6580 if (!OldDecl && !Invalid) { 6581 Diag(UsingLoc, diag::err_redefinition_different_kind) 6582 << Name.Identifier; 6583 6584 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6585 if (OldD->getLocation().isValid()) 6586 Diag(OldD->getLocation(), diag::note_previous_definition); 6587 6588 Invalid = true; 6589 } 6590 6591 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6592 if (TemplateParameterListsAreEqual(TemplateParams, 6593 OldDecl->getTemplateParameters(), 6594 /*Complain=*/true, 6595 TPL_TemplateMatch)) 6596 OldTemplateParams = OldDecl->getTemplateParameters(); 6597 else 6598 Invalid = true; 6599 6600 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6601 if (!Invalid && 6602 !Context.hasSameType(OldTD->getUnderlyingType(), 6603 NewTD->getUnderlyingType())) { 6604 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6605 // but we can't reasonably accept it. 6606 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6607 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6608 if (OldTD->getLocation().isValid()) 6609 Diag(OldTD->getLocation(), diag::note_previous_definition); 6610 Invalid = true; 6611 } 6612 } 6613 } 6614 6615 // Merge any previous default template arguments into our parameters, 6616 // and check the parameter list. 6617 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6618 TPC_TypeAliasTemplate)) 6619 return 0; 6620 6621 TypeAliasTemplateDecl *NewDecl = 6622 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6623 Name.Identifier, TemplateParams, 6624 NewTD); 6625 6626 NewDecl->setAccess(AS); 6627 6628 if (Invalid) 6629 NewDecl->setInvalidDecl(); 6630 else if (OldDecl) 6631 NewDecl->setPreviousDeclaration(OldDecl); 6632 6633 NewND = NewDecl; 6634 } else { 6635 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6636 NewND = NewTD; 6637 } 6638 6639 if (!Redeclaration) 6640 PushOnScopeChains(NewND, S); 6641 6642 return NewND; 6643} 6644 6645Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6646 SourceLocation NamespaceLoc, 6647 SourceLocation AliasLoc, 6648 IdentifierInfo *Alias, 6649 CXXScopeSpec &SS, 6650 SourceLocation IdentLoc, 6651 IdentifierInfo *Ident) { 6652 6653 // Lookup the namespace name. 6654 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6655 LookupParsedName(R, S, &SS); 6656 6657 // Check if we have a previous declaration with the same name. 6658 NamedDecl *PrevDecl 6659 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6660 ForRedeclaration); 6661 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6662 PrevDecl = 0; 6663 6664 if (PrevDecl) { 6665 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6666 // We already have an alias with the same name that points to the same 6667 // namespace, so don't create a new one. 6668 // FIXME: At some point, we'll want to create the (redundant) 6669 // declaration to maintain better source information. 6670 if (!R.isAmbiguous() && !R.empty() && 6671 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6672 return 0; 6673 } 6674 6675 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6676 diag::err_redefinition_different_kind; 6677 Diag(AliasLoc, DiagID) << Alias; 6678 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6679 return 0; 6680 } 6681 6682 if (R.isAmbiguous()) 6683 return 0; 6684 6685 if (R.empty()) { 6686 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6687 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6688 return 0; 6689 } 6690 } 6691 6692 NamespaceAliasDecl *AliasDecl = 6693 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6694 Alias, SS.getWithLocInContext(Context), 6695 IdentLoc, R.getFoundDecl()); 6696 6697 PushOnScopeChains(AliasDecl, S); 6698 return AliasDecl; 6699} 6700 6701namespace { 6702 /// \brief Scoped object used to handle the state changes required in Sema 6703 /// to implicitly define the body of a C++ member function; 6704 class ImplicitlyDefinedFunctionScope { 6705 Sema &S; 6706 Sema::ContextRAII SavedContext; 6707 6708 public: 6709 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6710 : S(S), SavedContext(S, Method) 6711 { 6712 S.PushFunctionScope(); 6713 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6714 } 6715 6716 ~ImplicitlyDefinedFunctionScope() { 6717 S.PopExpressionEvaluationContext(); 6718 S.PopFunctionScopeInfo(); 6719 } 6720 }; 6721} 6722 6723Sema::ImplicitExceptionSpecification 6724Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6725 // C++ [except.spec]p14: 6726 // An implicitly declared special member function (Clause 12) shall have an 6727 // exception-specification. [...] 6728 ImplicitExceptionSpecification ExceptSpec(Context); 6729 if (ClassDecl->isInvalidDecl()) 6730 return ExceptSpec; 6731 6732 // Direct base-class constructors. 6733 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6734 BEnd = ClassDecl->bases_end(); 6735 B != BEnd; ++B) { 6736 if (B->isVirtual()) // Handled below. 6737 continue; 6738 6739 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6740 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6741 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6742 // If this is a deleted function, add it anyway. This might be conformant 6743 // with the standard. This might not. I'm not sure. It might not matter. 6744 if (Constructor) 6745 ExceptSpec.CalledDecl(Constructor); 6746 } 6747 } 6748 6749 // Virtual base-class constructors. 6750 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6751 BEnd = ClassDecl->vbases_end(); 6752 B != BEnd; ++B) { 6753 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6754 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6755 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6756 // If this is a deleted function, add it anyway. This might be conformant 6757 // with the standard. This might not. I'm not sure. It might not matter. 6758 if (Constructor) 6759 ExceptSpec.CalledDecl(Constructor); 6760 } 6761 } 6762 6763 // Field constructors. 6764 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6765 FEnd = ClassDecl->field_end(); 6766 F != FEnd; ++F) { 6767 if (F->hasInClassInitializer()) { 6768 if (Expr *E = F->getInClassInitializer()) 6769 ExceptSpec.CalledExpr(E); 6770 else if (!F->isInvalidDecl()) 6771 ExceptSpec.SetDelayed(); 6772 } else if (const RecordType *RecordTy 6773 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6774 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6775 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6776 // If this is a deleted function, add it anyway. This might be conformant 6777 // with the standard. This might not. I'm not sure. It might not matter. 6778 // In particular, the problem is that this function never gets called. It 6779 // might just be ill-formed because this function attempts to refer to 6780 // a deleted function here. 6781 if (Constructor) 6782 ExceptSpec.CalledDecl(Constructor); 6783 } 6784 } 6785 6786 return ExceptSpec; 6787} 6788 6789CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6790 CXXRecordDecl *ClassDecl) { 6791 // C++ [class.ctor]p5: 6792 // A default constructor for a class X is a constructor of class X 6793 // that can be called without an argument. If there is no 6794 // user-declared constructor for class X, a default constructor is 6795 // implicitly declared. An implicitly-declared default constructor 6796 // is an inline public member of its class. 6797 assert(!ClassDecl->hasUserDeclaredConstructor() && 6798 "Should not build implicit default constructor!"); 6799 6800 ImplicitExceptionSpecification Spec = 6801 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6802 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6803 6804 // Create the actual constructor declaration. 6805 CanQualType ClassType 6806 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6807 SourceLocation ClassLoc = ClassDecl->getLocation(); 6808 DeclarationName Name 6809 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6810 DeclarationNameInfo NameInfo(Name, ClassLoc); 6811 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6812 Context, ClassDecl, ClassLoc, NameInfo, 6813 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6814 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6815 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 6816 getLangOptions().CPlusPlus0x); 6817 DefaultCon->setAccess(AS_public); 6818 DefaultCon->setDefaulted(); 6819 DefaultCon->setImplicit(); 6820 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6821 6822 // Note that we have declared this constructor. 6823 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6824 6825 if (Scope *S = getScopeForContext(ClassDecl)) 6826 PushOnScopeChains(DefaultCon, S, false); 6827 ClassDecl->addDecl(DefaultCon); 6828 6829 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6830 DefaultCon->setDeletedAsWritten(); 6831 6832 return DefaultCon; 6833} 6834 6835void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6836 CXXConstructorDecl *Constructor) { 6837 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6838 !Constructor->doesThisDeclarationHaveABody() && 6839 !Constructor->isDeleted()) && 6840 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6841 6842 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6843 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6844 6845 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6846 DiagnosticErrorTrap Trap(Diags); 6847 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6848 Trap.hasErrorOccurred()) { 6849 Diag(CurrentLocation, diag::note_member_synthesized_at) 6850 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6851 Constructor->setInvalidDecl(); 6852 return; 6853 } 6854 6855 SourceLocation Loc = Constructor->getLocation(); 6856 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6857 6858 Constructor->setUsed(); 6859 MarkVTableUsed(CurrentLocation, ClassDecl); 6860 6861 if (ASTMutationListener *L = getASTMutationListener()) { 6862 L->CompletedImplicitDefinition(Constructor); 6863 } 6864} 6865 6866/// Get any existing defaulted default constructor for the given class. Do not 6867/// implicitly define one if it does not exist. 6868static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6869 CXXRecordDecl *D) { 6870 ASTContext &Context = Self.Context; 6871 QualType ClassType = Context.getTypeDeclType(D); 6872 DeclarationName ConstructorName 6873 = Context.DeclarationNames.getCXXConstructorName( 6874 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6875 6876 DeclContext::lookup_const_iterator Con, ConEnd; 6877 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6878 Con != ConEnd; ++Con) { 6879 // A function template cannot be defaulted. 6880 if (isa<FunctionTemplateDecl>(*Con)) 6881 continue; 6882 6883 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6884 if (Constructor->isDefaultConstructor()) 6885 return Constructor->isDefaulted() ? Constructor : 0; 6886 } 6887 return 0; 6888} 6889 6890void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6891 if (!D) return; 6892 AdjustDeclIfTemplate(D); 6893 6894 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6895 CXXConstructorDecl *CtorDecl 6896 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6897 6898 if (!CtorDecl) return; 6899 6900 // Compute the exception specification for the default constructor. 6901 const FunctionProtoType *CtorTy = 6902 CtorDecl->getType()->castAs<FunctionProtoType>(); 6903 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6904 ImplicitExceptionSpecification Spec = 6905 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6906 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6907 assert(EPI.ExceptionSpecType != EST_Delayed); 6908 6909 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6910 } 6911 6912 // If the default constructor is explicitly defaulted, checking the exception 6913 // specification is deferred until now. 6914 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6915 !ClassDecl->isDependentType()) 6916 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6917} 6918 6919void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6920 // We start with an initial pass over the base classes to collect those that 6921 // inherit constructors from. If there are none, we can forgo all further 6922 // processing. 6923 typedef SmallVector<const RecordType *, 4> BasesVector; 6924 BasesVector BasesToInheritFrom; 6925 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6926 BaseE = ClassDecl->bases_end(); 6927 BaseIt != BaseE; ++BaseIt) { 6928 if (BaseIt->getInheritConstructors()) { 6929 QualType Base = BaseIt->getType(); 6930 if (Base->isDependentType()) { 6931 // If we inherit constructors from anything that is dependent, just 6932 // abort processing altogether. We'll get another chance for the 6933 // instantiations. 6934 return; 6935 } 6936 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6937 } 6938 } 6939 if (BasesToInheritFrom.empty()) 6940 return; 6941 6942 // Now collect the constructors that we already have in the current class. 6943 // Those take precedence over inherited constructors. 6944 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6945 // unless there is a user-declared constructor with the same signature in 6946 // the class where the using-declaration appears. 6947 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6948 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6949 CtorE = ClassDecl->ctor_end(); 6950 CtorIt != CtorE; ++CtorIt) { 6951 ExistingConstructors.insert( 6952 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6953 } 6954 6955 Scope *S = getScopeForContext(ClassDecl); 6956 DeclarationName CreatedCtorName = 6957 Context.DeclarationNames.getCXXConstructorName( 6958 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6959 6960 // Now comes the true work. 6961 // First, we keep a map from constructor types to the base that introduced 6962 // them. Needed for finding conflicting constructors. We also keep the 6963 // actually inserted declarations in there, for pretty diagnostics. 6964 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6965 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6966 ConstructorToSourceMap InheritedConstructors; 6967 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6968 BaseE = BasesToInheritFrom.end(); 6969 BaseIt != BaseE; ++BaseIt) { 6970 const RecordType *Base = *BaseIt; 6971 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6972 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6973 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6974 CtorE = BaseDecl->ctor_end(); 6975 CtorIt != CtorE; ++CtorIt) { 6976 // Find the using declaration for inheriting this base's constructors. 6977 DeclarationName Name = 6978 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6979 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6980 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6981 SourceLocation UsingLoc = UD ? UD->getLocation() : 6982 ClassDecl->getLocation(); 6983 6984 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6985 // from the class X named in the using-declaration consists of actual 6986 // constructors and notional constructors that result from the 6987 // transformation of defaulted parameters as follows: 6988 // - all non-template default constructors of X, and 6989 // - for each non-template constructor of X that has at least one 6990 // parameter with a default argument, the set of constructors that 6991 // results from omitting any ellipsis parameter specification and 6992 // successively omitting parameters with a default argument from the 6993 // end of the parameter-type-list. 6994 CXXConstructorDecl *BaseCtor = *CtorIt; 6995 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6996 const FunctionProtoType *BaseCtorType = 6997 BaseCtor->getType()->getAs<FunctionProtoType>(); 6998 6999 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7000 maxParams = BaseCtor->getNumParams(); 7001 params <= maxParams; ++params) { 7002 // Skip default constructors. They're never inherited. 7003 if (params == 0) 7004 continue; 7005 // Skip copy and move constructors for the same reason. 7006 if (CanBeCopyOrMove && params == 1) 7007 continue; 7008 7009 // Build up a function type for this particular constructor. 7010 // FIXME: The working paper does not consider that the exception spec 7011 // for the inheriting constructor might be larger than that of the 7012 // source. This code doesn't yet, either. When it does, this code will 7013 // need to be delayed until after exception specifications and in-class 7014 // member initializers are attached. 7015 const Type *NewCtorType; 7016 if (params == maxParams) 7017 NewCtorType = BaseCtorType; 7018 else { 7019 SmallVector<QualType, 16> Args; 7020 for (unsigned i = 0; i < params; ++i) { 7021 Args.push_back(BaseCtorType->getArgType(i)); 7022 } 7023 FunctionProtoType::ExtProtoInfo ExtInfo = 7024 BaseCtorType->getExtProtoInfo(); 7025 ExtInfo.Variadic = false; 7026 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7027 Args.data(), params, ExtInfo) 7028 .getTypePtr(); 7029 } 7030 const Type *CanonicalNewCtorType = 7031 Context.getCanonicalType(NewCtorType); 7032 7033 // Now that we have the type, first check if the class already has a 7034 // constructor with this signature. 7035 if (ExistingConstructors.count(CanonicalNewCtorType)) 7036 continue; 7037 7038 // Then we check if we have already declared an inherited constructor 7039 // with this signature. 7040 std::pair<ConstructorToSourceMap::iterator, bool> result = 7041 InheritedConstructors.insert(std::make_pair( 7042 CanonicalNewCtorType, 7043 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7044 if (!result.second) { 7045 // Already in the map. If it came from a different class, that's an 7046 // error. Not if it's from the same. 7047 CanQualType PreviousBase = result.first->second.first; 7048 if (CanonicalBase != PreviousBase) { 7049 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7050 const CXXConstructorDecl *PrevBaseCtor = 7051 PrevCtor->getInheritedConstructor(); 7052 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7053 7054 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7055 Diag(BaseCtor->getLocation(), 7056 diag::note_using_decl_constructor_conflict_current_ctor); 7057 Diag(PrevBaseCtor->getLocation(), 7058 diag::note_using_decl_constructor_conflict_previous_ctor); 7059 Diag(PrevCtor->getLocation(), 7060 diag::note_using_decl_constructor_conflict_previous_using); 7061 } 7062 continue; 7063 } 7064 7065 // OK, we're there, now add the constructor. 7066 // C++0x [class.inhctor]p8: [...] that would be performed by a 7067 // user-written inline constructor [...] 7068 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7069 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7070 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7071 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7072 /*ImplicitlyDeclared=*/true, 7073 // FIXME: Due to a defect in the standard, we treat inherited 7074 // constructors as constexpr even if that makes them ill-formed. 7075 /*Constexpr=*/BaseCtor->isConstexpr()); 7076 NewCtor->setAccess(BaseCtor->getAccess()); 7077 7078 // Build up the parameter decls and add them. 7079 SmallVector<ParmVarDecl *, 16> ParamDecls; 7080 for (unsigned i = 0; i < params; ++i) { 7081 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7082 UsingLoc, UsingLoc, 7083 /*IdentifierInfo=*/0, 7084 BaseCtorType->getArgType(i), 7085 /*TInfo=*/0, SC_None, 7086 SC_None, /*DefaultArg=*/0)); 7087 } 7088 NewCtor->setParams(ParamDecls); 7089 NewCtor->setInheritedConstructor(BaseCtor); 7090 7091 PushOnScopeChains(NewCtor, S, false); 7092 ClassDecl->addDecl(NewCtor); 7093 result.first->second.second = NewCtor; 7094 } 7095 } 7096 } 7097} 7098 7099Sema::ImplicitExceptionSpecification 7100Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7101 // C++ [except.spec]p14: 7102 // An implicitly declared special member function (Clause 12) shall have 7103 // an exception-specification. 7104 ImplicitExceptionSpecification ExceptSpec(Context); 7105 if (ClassDecl->isInvalidDecl()) 7106 return ExceptSpec; 7107 7108 // Direct base-class destructors. 7109 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7110 BEnd = ClassDecl->bases_end(); 7111 B != BEnd; ++B) { 7112 if (B->isVirtual()) // Handled below. 7113 continue; 7114 7115 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7116 ExceptSpec.CalledDecl( 7117 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7118 } 7119 7120 // Virtual base-class destructors. 7121 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7122 BEnd = ClassDecl->vbases_end(); 7123 B != BEnd; ++B) { 7124 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7125 ExceptSpec.CalledDecl( 7126 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7127 } 7128 7129 // Field destructors. 7130 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7131 FEnd = ClassDecl->field_end(); 7132 F != FEnd; ++F) { 7133 if (const RecordType *RecordTy 7134 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7135 ExceptSpec.CalledDecl( 7136 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7137 } 7138 7139 return ExceptSpec; 7140} 7141 7142CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7143 // C++ [class.dtor]p2: 7144 // If a class has no user-declared destructor, a destructor is 7145 // declared implicitly. An implicitly-declared destructor is an 7146 // inline public member of its class. 7147 7148 ImplicitExceptionSpecification Spec = 7149 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7150 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7151 7152 // Create the actual destructor declaration. 7153 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7154 7155 CanQualType ClassType 7156 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7157 SourceLocation ClassLoc = ClassDecl->getLocation(); 7158 DeclarationName Name 7159 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7160 DeclarationNameInfo NameInfo(Name, ClassLoc); 7161 CXXDestructorDecl *Destructor 7162 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7163 /*isInline=*/true, 7164 /*isImplicitlyDeclared=*/true); 7165 Destructor->setAccess(AS_public); 7166 Destructor->setDefaulted(); 7167 Destructor->setImplicit(); 7168 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7169 7170 // Note that we have declared this destructor. 7171 ++ASTContext::NumImplicitDestructorsDeclared; 7172 7173 // Introduce this destructor into its scope. 7174 if (Scope *S = getScopeForContext(ClassDecl)) 7175 PushOnScopeChains(Destructor, S, false); 7176 ClassDecl->addDecl(Destructor); 7177 7178 // This could be uniqued if it ever proves significant. 7179 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7180 7181 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7182 Destructor->setDeletedAsWritten(); 7183 7184 AddOverriddenMethods(ClassDecl, Destructor); 7185 7186 return Destructor; 7187} 7188 7189void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7190 CXXDestructorDecl *Destructor) { 7191 assert((Destructor->isDefaulted() && 7192 !Destructor->doesThisDeclarationHaveABody()) && 7193 "DefineImplicitDestructor - call it for implicit default dtor"); 7194 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7195 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7196 7197 if (Destructor->isInvalidDecl()) 7198 return; 7199 7200 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7201 7202 DiagnosticErrorTrap Trap(Diags); 7203 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7204 Destructor->getParent()); 7205 7206 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7207 Diag(CurrentLocation, diag::note_member_synthesized_at) 7208 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7209 7210 Destructor->setInvalidDecl(); 7211 return; 7212 } 7213 7214 SourceLocation Loc = Destructor->getLocation(); 7215 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7216 Destructor->setImplicitlyDefined(true); 7217 Destructor->setUsed(); 7218 MarkVTableUsed(CurrentLocation, ClassDecl); 7219 7220 if (ASTMutationListener *L = getASTMutationListener()) { 7221 L->CompletedImplicitDefinition(Destructor); 7222 } 7223} 7224 7225void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7226 CXXDestructorDecl *destructor) { 7227 // C++11 [class.dtor]p3: 7228 // A declaration of a destructor that does not have an exception- 7229 // specification is implicitly considered to have the same exception- 7230 // specification as an implicit declaration. 7231 const FunctionProtoType *dtorType = destructor->getType()-> 7232 getAs<FunctionProtoType>(); 7233 if (dtorType->hasExceptionSpec()) 7234 return; 7235 7236 ImplicitExceptionSpecification exceptSpec = 7237 ComputeDefaultedDtorExceptionSpec(classDecl); 7238 7239 // Replace the destructor's type, building off the existing one. Fortunately, 7240 // the only thing of interest in the destructor type is its extended info. 7241 // The return and arguments are fixed. 7242 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7243 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7244 epi.NumExceptions = exceptSpec.size(); 7245 epi.Exceptions = exceptSpec.data(); 7246 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7247 7248 destructor->setType(ty); 7249 7250 // FIXME: If the destructor has a body that could throw, and the newly created 7251 // spec doesn't allow exceptions, we should emit a warning, because this 7252 // change in behavior can break conforming C++03 programs at runtime. 7253 // However, we don't have a body yet, so it needs to be done somewhere else. 7254} 7255 7256/// \brief Builds a statement that copies/moves the given entity from \p From to 7257/// \c To. 7258/// 7259/// This routine is used to copy/move the members of a class with an 7260/// implicitly-declared copy/move assignment operator. When the entities being 7261/// copied are arrays, this routine builds for loops to copy them. 7262/// 7263/// \param S The Sema object used for type-checking. 7264/// 7265/// \param Loc The location where the implicit copy/move is being generated. 7266/// 7267/// \param T The type of the expressions being copied/moved. Both expressions 7268/// must have this type. 7269/// 7270/// \param To The expression we are copying/moving to. 7271/// 7272/// \param From The expression we are copying/moving from. 7273/// 7274/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7275/// Otherwise, it's a non-static member subobject. 7276/// 7277/// \param Copying Whether we're copying or moving. 7278/// 7279/// \param Depth Internal parameter recording the depth of the recursion. 7280/// 7281/// \returns A statement or a loop that copies the expressions. 7282static StmtResult 7283BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7284 Expr *To, Expr *From, 7285 bool CopyingBaseSubobject, bool Copying, 7286 unsigned Depth = 0) { 7287 // C++0x [class.copy]p28: 7288 // Each subobject is assigned in the manner appropriate to its type: 7289 // 7290 // - if the subobject is of class type, as if by a call to operator= with 7291 // the subobject as the object expression and the corresponding 7292 // subobject of x as a single function argument (as if by explicit 7293 // qualification; that is, ignoring any possible virtual overriding 7294 // functions in more derived classes); 7295 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7296 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7297 7298 // Look for operator=. 7299 DeclarationName Name 7300 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7301 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7302 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7303 7304 // Filter out any result that isn't a copy/move-assignment operator. 7305 LookupResult::Filter F = OpLookup.makeFilter(); 7306 while (F.hasNext()) { 7307 NamedDecl *D = F.next(); 7308 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7309 if (Copying ? Method->isCopyAssignmentOperator() : 7310 Method->isMoveAssignmentOperator()) 7311 continue; 7312 7313 F.erase(); 7314 } 7315 F.done(); 7316 7317 // Suppress the protected check (C++ [class.protected]) for each of the 7318 // assignment operators we found. This strange dance is required when 7319 // we're assigning via a base classes's copy-assignment operator. To 7320 // ensure that we're getting the right base class subobject (without 7321 // ambiguities), we need to cast "this" to that subobject type; to 7322 // ensure that we don't go through the virtual call mechanism, we need 7323 // to qualify the operator= name with the base class (see below). However, 7324 // this means that if the base class has a protected copy assignment 7325 // operator, the protected member access check will fail. So, we 7326 // rewrite "protected" access to "public" access in this case, since we 7327 // know by construction that we're calling from a derived class. 7328 if (CopyingBaseSubobject) { 7329 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7330 L != LEnd; ++L) { 7331 if (L.getAccess() == AS_protected) 7332 L.setAccess(AS_public); 7333 } 7334 } 7335 7336 // Create the nested-name-specifier that will be used to qualify the 7337 // reference to operator=; this is required to suppress the virtual 7338 // call mechanism. 7339 CXXScopeSpec SS; 7340 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7341 SS.MakeTrivial(S.Context, 7342 NestedNameSpecifier::Create(S.Context, 0, false, 7343 CanonicalT), 7344 Loc); 7345 7346 // Create the reference to operator=. 7347 ExprResult OpEqualRef 7348 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7349 /*TemplateKWLoc=*/SourceLocation(), 7350 /*FirstQualifierInScope=*/0, 7351 OpLookup, 7352 /*TemplateArgs=*/0, 7353 /*SuppressQualifierCheck=*/true); 7354 if (OpEqualRef.isInvalid()) 7355 return StmtError(); 7356 7357 // Build the call to the assignment operator. 7358 7359 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7360 OpEqualRef.takeAs<Expr>(), 7361 Loc, &From, 1, Loc); 7362 if (Call.isInvalid()) 7363 return StmtError(); 7364 7365 return S.Owned(Call.takeAs<Stmt>()); 7366 } 7367 7368 // - if the subobject is of scalar type, the built-in assignment 7369 // operator is used. 7370 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7371 if (!ArrayTy) { 7372 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7373 if (Assignment.isInvalid()) 7374 return StmtError(); 7375 7376 return S.Owned(Assignment.takeAs<Stmt>()); 7377 } 7378 7379 // - if the subobject is an array, each element is assigned, in the 7380 // manner appropriate to the element type; 7381 7382 // Construct a loop over the array bounds, e.g., 7383 // 7384 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7385 // 7386 // that will copy each of the array elements. 7387 QualType SizeType = S.Context.getSizeType(); 7388 7389 // Create the iteration variable. 7390 IdentifierInfo *IterationVarName = 0; 7391 { 7392 SmallString<8> Str; 7393 llvm::raw_svector_ostream OS(Str); 7394 OS << "__i" << Depth; 7395 IterationVarName = &S.Context.Idents.get(OS.str()); 7396 } 7397 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7398 IterationVarName, SizeType, 7399 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7400 SC_None, SC_None); 7401 7402 // Initialize the iteration variable to zero. 7403 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7404 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7405 7406 // Create a reference to the iteration variable; we'll use this several 7407 // times throughout. 7408 Expr *IterationVarRef 7409 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7410 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7411 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7412 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7413 7414 // Create the DeclStmt that holds the iteration variable. 7415 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7416 7417 // Create the comparison against the array bound. 7418 llvm::APInt Upper 7419 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7420 Expr *Comparison 7421 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7422 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7423 BO_NE, S.Context.BoolTy, 7424 VK_RValue, OK_Ordinary, Loc); 7425 7426 // Create the pre-increment of the iteration variable. 7427 Expr *Increment 7428 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7429 VK_LValue, OK_Ordinary, Loc); 7430 7431 // Subscript the "from" and "to" expressions with the iteration variable. 7432 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7433 IterationVarRefRVal, 7434 Loc)); 7435 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7436 IterationVarRefRVal, 7437 Loc)); 7438 if (!Copying) // Cast to rvalue 7439 From = CastForMoving(S, From); 7440 7441 // Build the copy/move for an individual element of the array. 7442 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7443 To, From, CopyingBaseSubobject, 7444 Copying, Depth + 1); 7445 if (Copy.isInvalid()) 7446 return StmtError(); 7447 7448 // Construct the loop that copies all elements of this array. 7449 return S.ActOnForStmt(Loc, Loc, InitStmt, 7450 S.MakeFullExpr(Comparison), 7451 0, S.MakeFullExpr(Increment), 7452 Loc, Copy.take()); 7453} 7454 7455std::pair<Sema::ImplicitExceptionSpecification, bool> 7456Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7457 CXXRecordDecl *ClassDecl) { 7458 if (ClassDecl->isInvalidDecl()) 7459 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7460 7461 // C++ [class.copy]p10: 7462 // If the class definition does not explicitly declare a copy 7463 // assignment operator, one is declared implicitly. 7464 // The implicitly-defined copy assignment operator for a class X 7465 // will have the form 7466 // 7467 // X& X::operator=(const X&) 7468 // 7469 // if 7470 bool HasConstCopyAssignment = true; 7471 7472 // -- each direct base class B of X has a copy assignment operator 7473 // whose parameter is of type const B&, const volatile B& or B, 7474 // and 7475 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7476 BaseEnd = ClassDecl->bases_end(); 7477 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7478 // We'll handle this below 7479 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7480 continue; 7481 7482 assert(!Base->getType()->isDependentType() && 7483 "Cannot generate implicit members for class with dependent bases."); 7484 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7485 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7486 &HasConstCopyAssignment); 7487 } 7488 7489 // In C++11, the above citation has "or virtual" added 7490 if (LangOpts.CPlusPlus0x) { 7491 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7492 BaseEnd = ClassDecl->vbases_end(); 7493 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7494 assert(!Base->getType()->isDependentType() && 7495 "Cannot generate implicit members for class with dependent bases."); 7496 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7497 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7498 &HasConstCopyAssignment); 7499 } 7500 } 7501 7502 // -- for all the nonstatic data members of X that are of a class 7503 // type M (or array thereof), each such class type has a copy 7504 // assignment operator whose parameter is of type const M&, 7505 // const volatile M& or M. 7506 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7507 FieldEnd = ClassDecl->field_end(); 7508 HasConstCopyAssignment && Field != FieldEnd; 7509 ++Field) { 7510 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7511 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7512 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7513 &HasConstCopyAssignment); 7514 } 7515 } 7516 7517 // Otherwise, the implicitly declared copy assignment operator will 7518 // have the form 7519 // 7520 // X& X::operator=(X&) 7521 7522 // C++ [except.spec]p14: 7523 // An implicitly declared special member function (Clause 12) shall have an 7524 // exception-specification. [...] 7525 7526 // It is unspecified whether or not an implicit copy assignment operator 7527 // attempts to deduplicate calls to assignment operators of virtual bases are 7528 // made. As such, this exception specification is effectively unspecified. 7529 // Based on a similar decision made for constness in C++0x, we're erring on 7530 // the side of assuming such calls to be made regardless of whether they 7531 // actually happen. 7532 ImplicitExceptionSpecification ExceptSpec(Context); 7533 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7534 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7535 BaseEnd = ClassDecl->bases_end(); 7536 Base != BaseEnd; ++Base) { 7537 if (Base->isVirtual()) 7538 continue; 7539 7540 CXXRecordDecl *BaseClassDecl 7541 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7542 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7543 ArgQuals, false, 0)) 7544 ExceptSpec.CalledDecl(CopyAssign); 7545 } 7546 7547 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7548 BaseEnd = ClassDecl->vbases_end(); 7549 Base != BaseEnd; ++Base) { 7550 CXXRecordDecl *BaseClassDecl 7551 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7552 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7553 ArgQuals, false, 0)) 7554 ExceptSpec.CalledDecl(CopyAssign); 7555 } 7556 7557 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7558 FieldEnd = ClassDecl->field_end(); 7559 Field != FieldEnd; 7560 ++Field) { 7561 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7562 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7563 if (CXXMethodDecl *CopyAssign = 7564 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7565 ExceptSpec.CalledDecl(CopyAssign); 7566 } 7567 } 7568 7569 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7570} 7571 7572CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7573 // Note: The following rules are largely analoguous to the copy 7574 // constructor rules. Note that virtual bases are not taken into account 7575 // for determining the argument type of the operator. Note also that 7576 // operators taking an object instead of a reference are allowed. 7577 7578 ImplicitExceptionSpecification Spec(Context); 7579 bool Const; 7580 llvm::tie(Spec, Const) = 7581 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7582 7583 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7584 QualType RetType = Context.getLValueReferenceType(ArgType); 7585 if (Const) 7586 ArgType = ArgType.withConst(); 7587 ArgType = Context.getLValueReferenceType(ArgType); 7588 7589 // An implicitly-declared copy assignment operator is an inline public 7590 // member of its class. 7591 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7592 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7593 SourceLocation ClassLoc = ClassDecl->getLocation(); 7594 DeclarationNameInfo NameInfo(Name, ClassLoc); 7595 CXXMethodDecl *CopyAssignment 7596 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7597 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7598 /*TInfo=*/0, /*isStatic=*/false, 7599 /*StorageClassAsWritten=*/SC_None, 7600 /*isInline=*/true, /*isConstexpr=*/false, 7601 SourceLocation()); 7602 CopyAssignment->setAccess(AS_public); 7603 CopyAssignment->setDefaulted(); 7604 CopyAssignment->setImplicit(); 7605 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7606 7607 // Add the parameter to the operator. 7608 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7609 ClassLoc, ClassLoc, /*Id=*/0, 7610 ArgType, /*TInfo=*/0, 7611 SC_None, 7612 SC_None, 0); 7613 CopyAssignment->setParams(FromParam); 7614 7615 // Note that we have added this copy-assignment operator. 7616 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7617 7618 if (Scope *S = getScopeForContext(ClassDecl)) 7619 PushOnScopeChains(CopyAssignment, S, false); 7620 ClassDecl->addDecl(CopyAssignment); 7621 7622 // C++0x [class.copy]p19: 7623 // .... If the class definition does not explicitly declare a copy 7624 // assignment operator, there is no user-declared move constructor, and 7625 // there is no user-declared move assignment operator, a copy assignment 7626 // operator is implicitly declared as defaulted. 7627 if ((ClassDecl->hasUserDeclaredMoveConstructor() && 7628 !getLangOptions().MicrosoftMode) || 7629 ClassDecl->hasUserDeclaredMoveAssignment() || 7630 ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7631 CopyAssignment->setDeletedAsWritten(); 7632 7633 AddOverriddenMethods(ClassDecl, CopyAssignment); 7634 return CopyAssignment; 7635} 7636 7637void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7638 CXXMethodDecl *CopyAssignOperator) { 7639 assert((CopyAssignOperator->isDefaulted() && 7640 CopyAssignOperator->isOverloadedOperator() && 7641 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7642 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7643 "DefineImplicitCopyAssignment called for wrong function"); 7644 7645 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7646 7647 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7648 CopyAssignOperator->setInvalidDecl(); 7649 return; 7650 } 7651 7652 CopyAssignOperator->setUsed(); 7653 7654 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7655 DiagnosticErrorTrap Trap(Diags); 7656 7657 // C++0x [class.copy]p30: 7658 // The implicitly-defined or explicitly-defaulted copy assignment operator 7659 // for a non-union class X performs memberwise copy assignment of its 7660 // subobjects. The direct base classes of X are assigned first, in the 7661 // order of their declaration in the base-specifier-list, and then the 7662 // immediate non-static data members of X are assigned, in the order in 7663 // which they were declared in the class definition. 7664 7665 // The statements that form the synthesized function body. 7666 ASTOwningVector<Stmt*> Statements(*this); 7667 7668 // The parameter for the "other" object, which we are copying from. 7669 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7670 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7671 QualType OtherRefType = Other->getType(); 7672 if (const LValueReferenceType *OtherRef 7673 = OtherRefType->getAs<LValueReferenceType>()) { 7674 OtherRefType = OtherRef->getPointeeType(); 7675 OtherQuals = OtherRefType.getQualifiers(); 7676 } 7677 7678 // Our location for everything implicitly-generated. 7679 SourceLocation Loc = CopyAssignOperator->getLocation(); 7680 7681 // Construct a reference to the "other" object. We'll be using this 7682 // throughout the generated ASTs. 7683 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7684 assert(OtherRef && "Reference to parameter cannot fail!"); 7685 7686 // Construct the "this" pointer. We'll be using this throughout the generated 7687 // ASTs. 7688 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7689 assert(This && "Reference to this cannot fail!"); 7690 7691 // Assign base classes. 7692 bool Invalid = false; 7693 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7694 E = ClassDecl->bases_end(); Base != E; ++Base) { 7695 // Form the assignment: 7696 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7697 QualType BaseType = Base->getType().getUnqualifiedType(); 7698 if (!BaseType->isRecordType()) { 7699 Invalid = true; 7700 continue; 7701 } 7702 7703 CXXCastPath BasePath; 7704 BasePath.push_back(Base); 7705 7706 // Construct the "from" expression, which is an implicit cast to the 7707 // appropriately-qualified base type. 7708 Expr *From = OtherRef; 7709 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7710 CK_UncheckedDerivedToBase, 7711 VK_LValue, &BasePath).take(); 7712 7713 // Dereference "this". 7714 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7715 7716 // Implicitly cast "this" to the appropriately-qualified base type. 7717 To = ImpCastExprToType(To.take(), 7718 Context.getCVRQualifiedType(BaseType, 7719 CopyAssignOperator->getTypeQualifiers()), 7720 CK_UncheckedDerivedToBase, 7721 VK_LValue, &BasePath); 7722 7723 // Build the copy. 7724 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7725 To.get(), From, 7726 /*CopyingBaseSubobject=*/true, 7727 /*Copying=*/true); 7728 if (Copy.isInvalid()) { 7729 Diag(CurrentLocation, diag::note_member_synthesized_at) 7730 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7731 CopyAssignOperator->setInvalidDecl(); 7732 return; 7733 } 7734 7735 // Success! Record the copy. 7736 Statements.push_back(Copy.takeAs<Expr>()); 7737 } 7738 7739 // \brief Reference to the __builtin_memcpy function. 7740 Expr *BuiltinMemCpyRef = 0; 7741 // \brief Reference to the __builtin_objc_memmove_collectable function. 7742 Expr *CollectableMemCpyRef = 0; 7743 7744 // Assign non-static members. 7745 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7746 FieldEnd = ClassDecl->field_end(); 7747 Field != FieldEnd; ++Field) { 7748 if (Field->isUnnamedBitfield()) 7749 continue; 7750 7751 // Check for members of reference type; we can't copy those. 7752 if (Field->getType()->isReferenceType()) { 7753 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7754 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7755 Diag(Field->getLocation(), diag::note_declared_at); 7756 Diag(CurrentLocation, diag::note_member_synthesized_at) 7757 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7758 Invalid = true; 7759 continue; 7760 } 7761 7762 // Check for members of const-qualified, non-class type. 7763 QualType BaseType = Context.getBaseElementType(Field->getType()); 7764 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7765 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7766 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7767 Diag(Field->getLocation(), diag::note_declared_at); 7768 Diag(CurrentLocation, diag::note_member_synthesized_at) 7769 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7770 Invalid = true; 7771 continue; 7772 } 7773 7774 // Suppress assigning zero-width bitfields. 7775 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7776 continue; 7777 7778 QualType FieldType = Field->getType().getNonReferenceType(); 7779 if (FieldType->isIncompleteArrayType()) { 7780 assert(ClassDecl->hasFlexibleArrayMember() && 7781 "Incomplete array type is not valid"); 7782 continue; 7783 } 7784 7785 // Build references to the field in the object we're copying from and to. 7786 CXXScopeSpec SS; // Intentionally empty 7787 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7788 LookupMemberName); 7789 MemberLookup.addDecl(*Field); 7790 MemberLookup.resolveKind(); 7791 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7792 Loc, /*IsArrow=*/false, 7793 SS, SourceLocation(), 0, 7794 MemberLookup, 0); 7795 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7796 Loc, /*IsArrow=*/true, 7797 SS, SourceLocation(), 0, 7798 MemberLookup, 0); 7799 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7800 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7801 7802 // If the field should be copied with __builtin_memcpy rather than via 7803 // explicit assignments, do so. This optimization only applies for arrays 7804 // of scalars and arrays of class type with trivial copy-assignment 7805 // operators. 7806 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7807 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7808 // Compute the size of the memory buffer to be copied. 7809 QualType SizeType = Context.getSizeType(); 7810 llvm::APInt Size(Context.getTypeSize(SizeType), 7811 Context.getTypeSizeInChars(BaseType).getQuantity()); 7812 for (const ConstantArrayType *Array 7813 = Context.getAsConstantArrayType(FieldType); 7814 Array; 7815 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7816 llvm::APInt ArraySize 7817 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7818 Size *= ArraySize; 7819 } 7820 7821 // Take the address of the field references for "from" and "to". 7822 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7823 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7824 7825 bool NeedsCollectableMemCpy = 7826 (BaseType->isRecordType() && 7827 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7828 7829 if (NeedsCollectableMemCpy) { 7830 if (!CollectableMemCpyRef) { 7831 // Create a reference to the __builtin_objc_memmove_collectable function. 7832 LookupResult R(*this, 7833 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7834 Loc, LookupOrdinaryName); 7835 LookupName(R, TUScope, true); 7836 7837 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7838 if (!CollectableMemCpy) { 7839 // Something went horribly wrong earlier, and we will have 7840 // complained about it. 7841 Invalid = true; 7842 continue; 7843 } 7844 7845 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7846 CollectableMemCpy->getType(), 7847 VK_LValue, Loc, 0).take(); 7848 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7849 } 7850 } 7851 // Create a reference to the __builtin_memcpy builtin function. 7852 else if (!BuiltinMemCpyRef) { 7853 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7854 LookupOrdinaryName); 7855 LookupName(R, TUScope, true); 7856 7857 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7858 if (!BuiltinMemCpy) { 7859 // Something went horribly wrong earlier, and we will have complained 7860 // about it. 7861 Invalid = true; 7862 continue; 7863 } 7864 7865 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7866 BuiltinMemCpy->getType(), 7867 VK_LValue, Loc, 0).take(); 7868 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7869 } 7870 7871 ASTOwningVector<Expr*> CallArgs(*this); 7872 CallArgs.push_back(To.takeAs<Expr>()); 7873 CallArgs.push_back(From.takeAs<Expr>()); 7874 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7875 ExprResult Call = ExprError(); 7876 if (NeedsCollectableMemCpy) 7877 Call = ActOnCallExpr(/*Scope=*/0, 7878 CollectableMemCpyRef, 7879 Loc, move_arg(CallArgs), 7880 Loc); 7881 else 7882 Call = ActOnCallExpr(/*Scope=*/0, 7883 BuiltinMemCpyRef, 7884 Loc, move_arg(CallArgs), 7885 Loc); 7886 7887 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7888 Statements.push_back(Call.takeAs<Expr>()); 7889 continue; 7890 } 7891 7892 // Build the copy of this field. 7893 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7894 To.get(), From.get(), 7895 /*CopyingBaseSubobject=*/false, 7896 /*Copying=*/true); 7897 if (Copy.isInvalid()) { 7898 Diag(CurrentLocation, diag::note_member_synthesized_at) 7899 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7900 CopyAssignOperator->setInvalidDecl(); 7901 return; 7902 } 7903 7904 // Success! Record the copy. 7905 Statements.push_back(Copy.takeAs<Stmt>()); 7906 } 7907 7908 if (!Invalid) { 7909 // Add a "return *this;" 7910 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7911 7912 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7913 if (Return.isInvalid()) 7914 Invalid = true; 7915 else { 7916 Statements.push_back(Return.takeAs<Stmt>()); 7917 7918 if (Trap.hasErrorOccurred()) { 7919 Diag(CurrentLocation, diag::note_member_synthesized_at) 7920 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7921 Invalid = true; 7922 } 7923 } 7924 } 7925 7926 if (Invalid) { 7927 CopyAssignOperator->setInvalidDecl(); 7928 return; 7929 } 7930 7931 StmtResult Body; 7932 { 7933 CompoundScopeRAII CompoundScope(*this); 7934 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7935 /*isStmtExpr=*/false); 7936 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7937 } 7938 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7939 7940 if (ASTMutationListener *L = getASTMutationListener()) { 7941 L->CompletedImplicitDefinition(CopyAssignOperator); 7942 } 7943} 7944 7945Sema::ImplicitExceptionSpecification 7946Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7947 ImplicitExceptionSpecification ExceptSpec(Context); 7948 7949 if (ClassDecl->isInvalidDecl()) 7950 return ExceptSpec; 7951 7952 // C++0x [except.spec]p14: 7953 // An implicitly declared special member function (Clause 12) shall have an 7954 // exception-specification. [...] 7955 7956 // It is unspecified whether or not an implicit move assignment operator 7957 // attempts to deduplicate calls to assignment operators of virtual bases are 7958 // made. As such, this exception specification is effectively unspecified. 7959 // Based on a similar decision made for constness in C++0x, we're erring on 7960 // the side of assuming such calls to be made regardless of whether they 7961 // actually happen. 7962 // Note that a move constructor is not implicitly declared when there are 7963 // virtual bases, but it can still be user-declared and explicitly defaulted. 7964 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7965 BaseEnd = ClassDecl->bases_end(); 7966 Base != BaseEnd; ++Base) { 7967 if (Base->isVirtual()) 7968 continue; 7969 7970 CXXRecordDecl *BaseClassDecl 7971 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7972 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7973 false, 0)) 7974 ExceptSpec.CalledDecl(MoveAssign); 7975 } 7976 7977 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7978 BaseEnd = ClassDecl->vbases_end(); 7979 Base != BaseEnd; ++Base) { 7980 CXXRecordDecl *BaseClassDecl 7981 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7982 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7983 false, 0)) 7984 ExceptSpec.CalledDecl(MoveAssign); 7985 } 7986 7987 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7988 FieldEnd = ClassDecl->field_end(); 7989 Field != FieldEnd; 7990 ++Field) { 7991 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7992 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7993 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7994 false, 0)) 7995 ExceptSpec.CalledDecl(MoveAssign); 7996 } 7997 } 7998 7999 return ExceptSpec; 8000} 8001 8002CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8003 // Note: The following rules are largely analoguous to the move 8004 // constructor rules. 8005 8006 ImplicitExceptionSpecification Spec( 8007 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8008 8009 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8010 QualType RetType = Context.getLValueReferenceType(ArgType); 8011 ArgType = Context.getRValueReferenceType(ArgType); 8012 8013 // An implicitly-declared move assignment operator is an inline public 8014 // member of its class. 8015 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8016 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8017 SourceLocation ClassLoc = ClassDecl->getLocation(); 8018 DeclarationNameInfo NameInfo(Name, ClassLoc); 8019 CXXMethodDecl *MoveAssignment 8020 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8021 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8022 /*TInfo=*/0, /*isStatic=*/false, 8023 /*StorageClassAsWritten=*/SC_None, 8024 /*isInline=*/true, 8025 /*isConstexpr=*/false, 8026 SourceLocation()); 8027 MoveAssignment->setAccess(AS_public); 8028 MoveAssignment->setDefaulted(); 8029 MoveAssignment->setImplicit(); 8030 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8031 8032 // Add the parameter to the operator. 8033 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8034 ClassLoc, ClassLoc, /*Id=*/0, 8035 ArgType, /*TInfo=*/0, 8036 SC_None, 8037 SC_None, 0); 8038 MoveAssignment->setParams(FromParam); 8039 8040 // Note that we have added this copy-assignment operator. 8041 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8042 8043 // C++0x [class.copy]p9: 8044 // If the definition of a class X does not explicitly declare a move 8045 // assignment operator, one will be implicitly declared as defaulted if and 8046 // only if: 8047 // [...] 8048 // - the move assignment operator would not be implicitly defined as 8049 // deleted. 8050 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8051 // Cache this result so that we don't try to generate this over and over 8052 // on every lookup, leaking memory and wasting time. 8053 ClassDecl->setFailedImplicitMoveAssignment(); 8054 return 0; 8055 } 8056 8057 if (Scope *S = getScopeForContext(ClassDecl)) 8058 PushOnScopeChains(MoveAssignment, S, false); 8059 ClassDecl->addDecl(MoveAssignment); 8060 8061 AddOverriddenMethods(ClassDecl, MoveAssignment); 8062 return MoveAssignment; 8063} 8064 8065void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8066 CXXMethodDecl *MoveAssignOperator) { 8067 assert((MoveAssignOperator->isDefaulted() && 8068 MoveAssignOperator->isOverloadedOperator() && 8069 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8070 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8071 "DefineImplicitMoveAssignment called for wrong function"); 8072 8073 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8074 8075 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8076 MoveAssignOperator->setInvalidDecl(); 8077 return; 8078 } 8079 8080 MoveAssignOperator->setUsed(); 8081 8082 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8083 DiagnosticErrorTrap Trap(Diags); 8084 8085 // C++0x [class.copy]p28: 8086 // The implicitly-defined or move assignment operator for a non-union class 8087 // X performs memberwise move assignment of its subobjects. The direct base 8088 // classes of X are assigned first, in the order of their declaration in the 8089 // base-specifier-list, and then the immediate non-static data members of X 8090 // are assigned, in the order in which they were declared in the class 8091 // definition. 8092 8093 // The statements that form the synthesized function body. 8094 ASTOwningVector<Stmt*> Statements(*this); 8095 8096 // The parameter for the "other" object, which we are move from. 8097 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8098 QualType OtherRefType = Other->getType()-> 8099 getAs<RValueReferenceType>()->getPointeeType(); 8100 assert(OtherRefType.getQualifiers() == 0 && 8101 "Bad argument type of defaulted move assignment"); 8102 8103 // Our location for everything implicitly-generated. 8104 SourceLocation Loc = MoveAssignOperator->getLocation(); 8105 8106 // Construct a reference to the "other" object. We'll be using this 8107 // throughout the generated ASTs. 8108 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8109 assert(OtherRef && "Reference to parameter cannot fail!"); 8110 // Cast to rvalue. 8111 OtherRef = CastForMoving(*this, OtherRef); 8112 8113 // Construct the "this" pointer. We'll be using this throughout the generated 8114 // ASTs. 8115 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8116 assert(This && "Reference to this cannot fail!"); 8117 8118 // Assign base classes. 8119 bool Invalid = false; 8120 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8121 E = ClassDecl->bases_end(); Base != E; ++Base) { 8122 // Form the assignment: 8123 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8124 QualType BaseType = Base->getType().getUnqualifiedType(); 8125 if (!BaseType->isRecordType()) { 8126 Invalid = true; 8127 continue; 8128 } 8129 8130 CXXCastPath BasePath; 8131 BasePath.push_back(Base); 8132 8133 // Construct the "from" expression, which is an implicit cast to the 8134 // appropriately-qualified base type. 8135 Expr *From = OtherRef; 8136 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8137 VK_XValue, &BasePath).take(); 8138 8139 // Dereference "this". 8140 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8141 8142 // Implicitly cast "this" to the appropriately-qualified base type. 8143 To = ImpCastExprToType(To.take(), 8144 Context.getCVRQualifiedType(BaseType, 8145 MoveAssignOperator->getTypeQualifiers()), 8146 CK_UncheckedDerivedToBase, 8147 VK_LValue, &BasePath); 8148 8149 // Build the move. 8150 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8151 To.get(), From, 8152 /*CopyingBaseSubobject=*/true, 8153 /*Copying=*/false); 8154 if (Move.isInvalid()) { 8155 Diag(CurrentLocation, diag::note_member_synthesized_at) 8156 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8157 MoveAssignOperator->setInvalidDecl(); 8158 return; 8159 } 8160 8161 // Success! Record the move. 8162 Statements.push_back(Move.takeAs<Expr>()); 8163 } 8164 8165 // \brief Reference to the __builtin_memcpy function. 8166 Expr *BuiltinMemCpyRef = 0; 8167 // \brief Reference to the __builtin_objc_memmove_collectable function. 8168 Expr *CollectableMemCpyRef = 0; 8169 8170 // Assign non-static members. 8171 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8172 FieldEnd = ClassDecl->field_end(); 8173 Field != FieldEnd; ++Field) { 8174 if (Field->isUnnamedBitfield()) 8175 continue; 8176 8177 // Check for members of reference type; we can't move those. 8178 if (Field->getType()->isReferenceType()) { 8179 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8180 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8181 Diag(Field->getLocation(), diag::note_declared_at); 8182 Diag(CurrentLocation, diag::note_member_synthesized_at) 8183 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8184 Invalid = true; 8185 continue; 8186 } 8187 8188 // Check for members of const-qualified, non-class type. 8189 QualType BaseType = Context.getBaseElementType(Field->getType()); 8190 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8191 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8192 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8193 Diag(Field->getLocation(), diag::note_declared_at); 8194 Diag(CurrentLocation, diag::note_member_synthesized_at) 8195 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8196 Invalid = true; 8197 continue; 8198 } 8199 8200 // Suppress assigning zero-width bitfields. 8201 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8202 continue; 8203 8204 QualType FieldType = Field->getType().getNonReferenceType(); 8205 if (FieldType->isIncompleteArrayType()) { 8206 assert(ClassDecl->hasFlexibleArrayMember() && 8207 "Incomplete array type is not valid"); 8208 continue; 8209 } 8210 8211 // Build references to the field in the object we're copying from and to. 8212 CXXScopeSpec SS; // Intentionally empty 8213 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8214 LookupMemberName); 8215 MemberLookup.addDecl(*Field); 8216 MemberLookup.resolveKind(); 8217 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8218 Loc, /*IsArrow=*/false, 8219 SS, SourceLocation(), 0, 8220 MemberLookup, 0); 8221 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8222 Loc, /*IsArrow=*/true, 8223 SS, SourceLocation(), 0, 8224 MemberLookup, 0); 8225 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8226 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8227 8228 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8229 "Member reference with rvalue base must be rvalue except for reference " 8230 "members, which aren't allowed for move assignment."); 8231 8232 // If the field should be copied with __builtin_memcpy rather than via 8233 // explicit assignments, do so. This optimization only applies for arrays 8234 // of scalars and arrays of class type with trivial move-assignment 8235 // operators. 8236 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8237 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8238 // Compute the size of the memory buffer to be copied. 8239 QualType SizeType = Context.getSizeType(); 8240 llvm::APInt Size(Context.getTypeSize(SizeType), 8241 Context.getTypeSizeInChars(BaseType).getQuantity()); 8242 for (const ConstantArrayType *Array 8243 = Context.getAsConstantArrayType(FieldType); 8244 Array; 8245 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8246 llvm::APInt ArraySize 8247 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8248 Size *= ArraySize; 8249 } 8250 8251 // Take the address of the field references for "from" and "to". We 8252 // directly construct UnaryOperators here because semantic analysis 8253 // does not permit us to take the address of an xvalue. 8254 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8255 Context.getPointerType(From.get()->getType()), 8256 VK_RValue, OK_Ordinary, Loc); 8257 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8258 Context.getPointerType(To.get()->getType()), 8259 VK_RValue, OK_Ordinary, Loc); 8260 8261 bool NeedsCollectableMemCpy = 8262 (BaseType->isRecordType() && 8263 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8264 8265 if (NeedsCollectableMemCpy) { 8266 if (!CollectableMemCpyRef) { 8267 // Create a reference to the __builtin_objc_memmove_collectable function. 8268 LookupResult R(*this, 8269 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8270 Loc, LookupOrdinaryName); 8271 LookupName(R, TUScope, true); 8272 8273 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8274 if (!CollectableMemCpy) { 8275 // Something went horribly wrong earlier, and we will have 8276 // complained about it. 8277 Invalid = true; 8278 continue; 8279 } 8280 8281 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8282 CollectableMemCpy->getType(), 8283 VK_LValue, Loc, 0).take(); 8284 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8285 } 8286 } 8287 // Create a reference to the __builtin_memcpy builtin function. 8288 else if (!BuiltinMemCpyRef) { 8289 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8290 LookupOrdinaryName); 8291 LookupName(R, TUScope, true); 8292 8293 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8294 if (!BuiltinMemCpy) { 8295 // Something went horribly wrong earlier, and we will have complained 8296 // about it. 8297 Invalid = true; 8298 continue; 8299 } 8300 8301 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8302 BuiltinMemCpy->getType(), 8303 VK_LValue, Loc, 0).take(); 8304 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8305 } 8306 8307 ASTOwningVector<Expr*> CallArgs(*this); 8308 CallArgs.push_back(To.takeAs<Expr>()); 8309 CallArgs.push_back(From.takeAs<Expr>()); 8310 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8311 ExprResult Call = ExprError(); 8312 if (NeedsCollectableMemCpy) 8313 Call = ActOnCallExpr(/*Scope=*/0, 8314 CollectableMemCpyRef, 8315 Loc, move_arg(CallArgs), 8316 Loc); 8317 else 8318 Call = ActOnCallExpr(/*Scope=*/0, 8319 BuiltinMemCpyRef, 8320 Loc, move_arg(CallArgs), 8321 Loc); 8322 8323 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8324 Statements.push_back(Call.takeAs<Expr>()); 8325 continue; 8326 } 8327 8328 // Build the move of this field. 8329 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8330 To.get(), From.get(), 8331 /*CopyingBaseSubobject=*/false, 8332 /*Copying=*/false); 8333 if (Move.isInvalid()) { 8334 Diag(CurrentLocation, diag::note_member_synthesized_at) 8335 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8336 MoveAssignOperator->setInvalidDecl(); 8337 return; 8338 } 8339 8340 // Success! Record the copy. 8341 Statements.push_back(Move.takeAs<Stmt>()); 8342 } 8343 8344 if (!Invalid) { 8345 // Add a "return *this;" 8346 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8347 8348 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8349 if (Return.isInvalid()) 8350 Invalid = true; 8351 else { 8352 Statements.push_back(Return.takeAs<Stmt>()); 8353 8354 if (Trap.hasErrorOccurred()) { 8355 Diag(CurrentLocation, diag::note_member_synthesized_at) 8356 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8357 Invalid = true; 8358 } 8359 } 8360 } 8361 8362 if (Invalid) { 8363 MoveAssignOperator->setInvalidDecl(); 8364 return; 8365 } 8366 8367 StmtResult Body; 8368 { 8369 CompoundScopeRAII CompoundScope(*this); 8370 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8371 /*isStmtExpr=*/false); 8372 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8373 } 8374 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8375 8376 if (ASTMutationListener *L = getASTMutationListener()) { 8377 L->CompletedImplicitDefinition(MoveAssignOperator); 8378 } 8379} 8380 8381std::pair<Sema::ImplicitExceptionSpecification, bool> 8382Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8383 if (ClassDecl->isInvalidDecl()) 8384 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8385 8386 // C++ [class.copy]p5: 8387 // The implicitly-declared copy constructor for a class X will 8388 // have the form 8389 // 8390 // X::X(const X&) 8391 // 8392 // if 8393 // FIXME: It ought to be possible to store this on the record. 8394 bool HasConstCopyConstructor = true; 8395 8396 // -- each direct or virtual base class B of X has a copy 8397 // constructor whose first parameter is of type const B& or 8398 // const volatile B&, and 8399 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8400 BaseEnd = ClassDecl->bases_end(); 8401 HasConstCopyConstructor && Base != BaseEnd; 8402 ++Base) { 8403 // Virtual bases are handled below. 8404 if (Base->isVirtual()) 8405 continue; 8406 8407 CXXRecordDecl *BaseClassDecl 8408 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8409 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8410 &HasConstCopyConstructor); 8411 } 8412 8413 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8414 BaseEnd = ClassDecl->vbases_end(); 8415 HasConstCopyConstructor && Base != BaseEnd; 8416 ++Base) { 8417 CXXRecordDecl *BaseClassDecl 8418 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8419 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8420 &HasConstCopyConstructor); 8421 } 8422 8423 // -- for all the nonstatic data members of X that are of a 8424 // class type M (or array thereof), each such class type 8425 // has a copy constructor whose first parameter is of type 8426 // const M& or const volatile M&. 8427 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8428 FieldEnd = ClassDecl->field_end(); 8429 HasConstCopyConstructor && Field != FieldEnd; 8430 ++Field) { 8431 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8432 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8433 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8434 &HasConstCopyConstructor); 8435 } 8436 } 8437 // Otherwise, the implicitly declared copy constructor will have 8438 // the form 8439 // 8440 // X::X(X&) 8441 8442 // C++ [except.spec]p14: 8443 // An implicitly declared special member function (Clause 12) shall have an 8444 // exception-specification. [...] 8445 ImplicitExceptionSpecification ExceptSpec(Context); 8446 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8447 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8448 BaseEnd = ClassDecl->bases_end(); 8449 Base != BaseEnd; 8450 ++Base) { 8451 // Virtual bases are handled below. 8452 if (Base->isVirtual()) 8453 continue; 8454 8455 CXXRecordDecl *BaseClassDecl 8456 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8457 if (CXXConstructorDecl *CopyConstructor = 8458 LookupCopyingConstructor(BaseClassDecl, Quals)) 8459 ExceptSpec.CalledDecl(CopyConstructor); 8460 } 8461 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8462 BaseEnd = ClassDecl->vbases_end(); 8463 Base != BaseEnd; 8464 ++Base) { 8465 CXXRecordDecl *BaseClassDecl 8466 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8467 if (CXXConstructorDecl *CopyConstructor = 8468 LookupCopyingConstructor(BaseClassDecl, Quals)) 8469 ExceptSpec.CalledDecl(CopyConstructor); 8470 } 8471 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8472 FieldEnd = ClassDecl->field_end(); 8473 Field != FieldEnd; 8474 ++Field) { 8475 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8476 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8477 if (CXXConstructorDecl *CopyConstructor = 8478 LookupCopyingConstructor(FieldClassDecl, Quals)) 8479 ExceptSpec.CalledDecl(CopyConstructor); 8480 } 8481 } 8482 8483 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8484} 8485 8486CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8487 CXXRecordDecl *ClassDecl) { 8488 // C++ [class.copy]p4: 8489 // If the class definition does not explicitly declare a copy 8490 // constructor, one is declared implicitly. 8491 8492 ImplicitExceptionSpecification Spec(Context); 8493 bool Const; 8494 llvm::tie(Spec, Const) = 8495 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8496 8497 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8498 QualType ArgType = ClassType; 8499 if (Const) 8500 ArgType = ArgType.withConst(); 8501 ArgType = Context.getLValueReferenceType(ArgType); 8502 8503 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8504 8505 DeclarationName Name 8506 = Context.DeclarationNames.getCXXConstructorName( 8507 Context.getCanonicalType(ClassType)); 8508 SourceLocation ClassLoc = ClassDecl->getLocation(); 8509 DeclarationNameInfo NameInfo(Name, ClassLoc); 8510 8511 // An implicitly-declared copy constructor is an inline public 8512 // member of its class. 8513 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8514 Context, ClassDecl, ClassLoc, NameInfo, 8515 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8516 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8517 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8518 getLangOptions().CPlusPlus0x); 8519 CopyConstructor->setAccess(AS_public); 8520 CopyConstructor->setDefaulted(); 8521 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8522 8523 // Note that we have declared this constructor. 8524 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8525 8526 // Add the parameter to the constructor. 8527 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8528 ClassLoc, ClassLoc, 8529 /*IdentifierInfo=*/0, 8530 ArgType, /*TInfo=*/0, 8531 SC_None, 8532 SC_None, 0); 8533 CopyConstructor->setParams(FromParam); 8534 8535 if (Scope *S = getScopeForContext(ClassDecl)) 8536 PushOnScopeChains(CopyConstructor, S, false); 8537 ClassDecl->addDecl(CopyConstructor); 8538 8539 // C++11 [class.copy]p8: 8540 // ... If the class definition does not explicitly declare a copy 8541 // constructor, there is no user-declared move constructor, and there is no 8542 // user-declared move assignment operator, a copy constructor is implicitly 8543 // declared as defaulted. 8544 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8545 (ClassDecl->hasUserDeclaredMoveAssignment() && 8546 !getLangOptions().MicrosoftMode) || 8547 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8548 CopyConstructor->setDeletedAsWritten(); 8549 8550 return CopyConstructor; 8551} 8552 8553void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8554 CXXConstructorDecl *CopyConstructor) { 8555 assert((CopyConstructor->isDefaulted() && 8556 CopyConstructor->isCopyConstructor() && 8557 !CopyConstructor->doesThisDeclarationHaveABody()) && 8558 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8559 8560 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8561 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8562 8563 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8564 DiagnosticErrorTrap Trap(Diags); 8565 8566 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8567 Trap.hasErrorOccurred()) { 8568 Diag(CurrentLocation, diag::note_member_synthesized_at) 8569 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8570 CopyConstructor->setInvalidDecl(); 8571 } else { 8572 Sema::CompoundScopeRAII CompoundScope(*this); 8573 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8574 CopyConstructor->getLocation(), 8575 MultiStmtArg(*this, 0, 0), 8576 /*isStmtExpr=*/false) 8577 .takeAs<Stmt>()); 8578 CopyConstructor->setImplicitlyDefined(true); 8579 } 8580 8581 CopyConstructor->setUsed(); 8582 if (ASTMutationListener *L = getASTMutationListener()) { 8583 L->CompletedImplicitDefinition(CopyConstructor); 8584 } 8585} 8586 8587Sema::ImplicitExceptionSpecification 8588Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8589 // C++ [except.spec]p14: 8590 // An implicitly declared special member function (Clause 12) shall have an 8591 // exception-specification. [...] 8592 ImplicitExceptionSpecification ExceptSpec(Context); 8593 if (ClassDecl->isInvalidDecl()) 8594 return ExceptSpec; 8595 8596 // Direct base-class constructors. 8597 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8598 BEnd = ClassDecl->bases_end(); 8599 B != BEnd; ++B) { 8600 if (B->isVirtual()) // Handled below. 8601 continue; 8602 8603 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8604 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8605 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8606 // If this is a deleted function, add it anyway. This might be conformant 8607 // with the standard. This might not. I'm not sure. It might not matter. 8608 if (Constructor) 8609 ExceptSpec.CalledDecl(Constructor); 8610 } 8611 } 8612 8613 // Virtual base-class constructors. 8614 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8615 BEnd = ClassDecl->vbases_end(); 8616 B != BEnd; ++B) { 8617 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8618 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8619 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8620 // If this is a deleted function, add it anyway. This might be conformant 8621 // with the standard. This might not. I'm not sure. It might not matter. 8622 if (Constructor) 8623 ExceptSpec.CalledDecl(Constructor); 8624 } 8625 } 8626 8627 // Field constructors. 8628 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8629 FEnd = ClassDecl->field_end(); 8630 F != FEnd; ++F) { 8631 if (const RecordType *RecordTy 8632 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8633 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8634 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8635 // If this is a deleted function, add it anyway. This might be conformant 8636 // with the standard. This might not. I'm not sure. It might not matter. 8637 // In particular, the problem is that this function never gets called. It 8638 // might just be ill-formed because this function attempts to refer to 8639 // a deleted function here. 8640 if (Constructor) 8641 ExceptSpec.CalledDecl(Constructor); 8642 } 8643 } 8644 8645 return ExceptSpec; 8646} 8647 8648CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8649 CXXRecordDecl *ClassDecl) { 8650 ImplicitExceptionSpecification Spec( 8651 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8652 8653 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8654 QualType ArgType = Context.getRValueReferenceType(ClassType); 8655 8656 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8657 8658 DeclarationName Name 8659 = Context.DeclarationNames.getCXXConstructorName( 8660 Context.getCanonicalType(ClassType)); 8661 SourceLocation ClassLoc = ClassDecl->getLocation(); 8662 DeclarationNameInfo NameInfo(Name, ClassLoc); 8663 8664 // C++0x [class.copy]p11: 8665 // An implicitly-declared copy/move constructor is an inline public 8666 // member of its class. 8667 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8668 Context, ClassDecl, ClassLoc, NameInfo, 8669 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8670 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8671 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8672 getLangOptions().CPlusPlus0x); 8673 MoveConstructor->setAccess(AS_public); 8674 MoveConstructor->setDefaulted(); 8675 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8676 8677 // Add the parameter to the constructor. 8678 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8679 ClassLoc, ClassLoc, 8680 /*IdentifierInfo=*/0, 8681 ArgType, /*TInfo=*/0, 8682 SC_None, 8683 SC_None, 0); 8684 MoveConstructor->setParams(FromParam); 8685 8686 // C++0x [class.copy]p9: 8687 // If the definition of a class X does not explicitly declare a move 8688 // constructor, one will be implicitly declared as defaulted if and only if: 8689 // [...] 8690 // - the move constructor would not be implicitly defined as deleted. 8691 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8692 // Cache this result so that we don't try to generate this over and over 8693 // on every lookup, leaking memory and wasting time. 8694 ClassDecl->setFailedImplicitMoveConstructor(); 8695 return 0; 8696 } 8697 8698 // Note that we have declared this constructor. 8699 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8700 8701 if (Scope *S = getScopeForContext(ClassDecl)) 8702 PushOnScopeChains(MoveConstructor, S, false); 8703 ClassDecl->addDecl(MoveConstructor); 8704 8705 return MoveConstructor; 8706} 8707 8708void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8709 CXXConstructorDecl *MoveConstructor) { 8710 assert((MoveConstructor->isDefaulted() && 8711 MoveConstructor->isMoveConstructor() && 8712 !MoveConstructor->doesThisDeclarationHaveABody()) && 8713 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8714 8715 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8716 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8717 8718 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8719 DiagnosticErrorTrap Trap(Diags); 8720 8721 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8722 Trap.hasErrorOccurred()) { 8723 Diag(CurrentLocation, diag::note_member_synthesized_at) 8724 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8725 MoveConstructor->setInvalidDecl(); 8726 } else { 8727 Sema::CompoundScopeRAII CompoundScope(*this); 8728 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8729 MoveConstructor->getLocation(), 8730 MultiStmtArg(*this, 0, 0), 8731 /*isStmtExpr=*/false) 8732 .takeAs<Stmt>()); 8733 MoveConstructor->setImplicitlyDefined(true); 8734 } 8735 8736 MoveConstructor->setUsed(); 8737 8738 if (ASTMutationListener *L = getASTMutationListener()) { 8739 L->CompletedImplicitDefinition(MoveConstructor); 8740 } 8741} 8742 8743bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8744 return FD->isDeleted() && 8745 (FD->isDefaulted() || FD->isImplicit()) && 8746 isa<CXXMethodDecl>(FD); 8747} 8748 8749/// \brief Mark the call operator of the given lambda closure type as "used". 8750static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8751 CXXMethodDecl *CallOperator 8752 = cast<CXXMethodDecl>( 8753 *Lambda->lookup( 8754 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8755 CallOperator->setReferenced(); 8756 CallOperator->setUsed(); 8757} 8758 8759void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8760 SourceLocation CurrentLocation, 8761 CXXConversionDecl *Conv) 8762{ 8763 CXXRecordDecl *Lambda = Conv->getParent(); 8764 8765 // Make sure that the lambda call operator is marked used. 8766 markLambdaCallOperatorUsed(*this, Lambda); 8767 8768 Conv->setUsed(); 8769 8770 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8771 DiagnosticErrorTrap Trap(Diags); 8772 8773 // Return the address of the __invoke function. 8774 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8775 CXXMethodDecl *Invoke 8776 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8777 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8778 VK_LValue, Conv->getLocation()).take(); 8779 assert(FunctionRef && "Can't refer to __invoke function?"); 8780 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8781 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8782 Conv->getLocation(), 8783 Conv->getLocation())); 8784 8785 // Fill in the __invoke function with a dummy implementation. IR generation 8786 // will fill in the actual details. 8787 Invoke->setUsed(); 8788 Invoke->setReferenced(); 8789 Invoke->setBody(new (Context) CompoundStmt(Context, 0, 0, Conv->getLocation(), 8790 Conv->getLocation())); 8791 8792 if (ASTMutationListener *L = getASTMutationListener()) { 8793 L->CompletedImplicitDefinition(Conv); 8794 L->CompletedImplicitDefinition(Invoke); 8795 } 8796} 8797 8798void Sema::DefineImplicitLambdaToBlockPointerConversion( 8799 SourceLocation CurrentLocation, 8800 CXXConversionDecl *Conv) 8801{ 8802 // Make sure that the lambda call operator is marked used. 8803 markLambdaCallOperatorUsed(*this, Conv->getParent()); 8804 Conv->setUsed(); 8805 8806 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8807 DiagnosticErrorTrap Trap(Diags); 8808 8809 // Copy-initialize the lambda object as needed to capture 8810 Expr *This = ActOnCXXThis(CurrentLocation).take(); 8811 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 8812 ExprResult Init = PerformCopyInitialization( 8813 InitializedEntity::InitializeBlock(CurrentLocation, 8814 DerefThis->getType(), 8815 /*NRVO=*/false), 8816 CurrentLocation, DerefThis); 8817 if (!Init.isInvalid()) 8818 Init = ActOnFinishFullExpr(Init.take()); 8819 8820 if (!Init.isInvalid()) 8821 Conv->setLambdaToBlockPointerCopyInit(Init.take()); 8822 else { 8823 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8824 } 8825 8826 // Introduce a bogus body, which IR generation will override anyway. 8827 Conv->setBody(new (Context) CompoundStmt(Context, 0, 0, Conv->getLocation(), 8828 Conv->getLocation())); 8829 8830 if (ASTMutationListener *L = getASTMutationListener()) { 8831 L->CompletedImplicitDefinition(Conv); 8832 } 8833} 8834 8835ExprResult 8836Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8837 CXXConstructorDecl *Constructor, 8838 MultiExprArg ExprArgs, 8839 bool HadMultipleCandidates, 8840 bool RequiresZeroInit, 8841 unsigned ConstructKind, 8842 SourceRange ParenRange) { 8843 bool Elidable = false; 8844 8845 // C++0x [class.copy]p34: 8846 // When certain criteria are met, an implementation is allowed to 8847 // omit the copy/move construction of a class object, even if the 8848 // copy/move constructor and/or destructor for the object have 8849 // side effects. [...] 8850 // - when a temporary class object that has not been bound to a 8851 // reference (12.2) would be copied/moved to a class object 8852 // with the same cv-unqualified type, the copy/move operation 8853 // can be omitted by constructing the temporary object 8854 // directly into the target of the omitted copy/move 8855 if (ConstructKind == CXXConstructExpr::CK_Complete && 8856 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8857 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8858 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8859 } 8860 8861 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8862 Elidable, move(ExprArgs), HadMultipleCandidates, 8863 RequiresZeroInit, ConstructKind, ParenRange); 8864} 8865 8866/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8867/// including handling of its default argument expressions. 8868ExprResult 8869Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8870 CXXConstructorDecl *Constructor, bool Elidable, 8871 MultiExprArg ExprArgs, 8872 bool HadMultipleCandidates, 8873 bool RequiresZeroInit, 8874 unsigned ConstructKind, 8875 SourceRange ParenRange) { 8876 unsigned NumExprs = ExprArgs.size(); 8877 Expr **Exprs = (Expr **)ExprArgs.release(); 8878 8879 for (specific_attr_iterator<NonNullAttr> 8880 i = Constructor->specific_attr_begin<NonNullAttr>(), 8881 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8882 const NonNullAttr *NonNull = *i; 8883 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8884 } 8885 8886 MarkFunctionReferenced(ConstructLoc, Constructor); 8887 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8888 Constructor, Elidable, Exprs, NumExprs, 8889 HadMultipleCandidates, /*FIXME*/false, 8890 RequiresZeroInit, 8891 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8892 ParenRange)); 8893} 8894 8895bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8896 CXXConstructorDecl *Constructor, 8897 MultiExprArg Exprs, 8898 bool HadMultipleCandidates) { 8899 // FIXME: Provide the correct paren SourceRange when available. 8900 ExprResult TempResult = 8901 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8902 move(Exprs), HadMultipleCandidates, false, 8903 CXXConstructExpr::CK_Complete, SourceRange()); 8904 if (TempResult.isInvalid()) 8905 return true; 8906 8907 Expr *Temp = TempResult.takeAs<Expr>(); 8908 CheckImplicitConversions(Temp, VD->getLocation()); 8909 MarkFunctionReferenced(VD->getLocation(), Constructor); 8910 Temp = MaybeCreateExprWithCleanups(Temp); 8911 VD->setInit(Temp); 8912 8913 return false; 8914} 8915 8916void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8917 if (VD->isInvalidDecl()) return; 8918 8919 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8920 if (ClassDecl->isInvalidDecl()) return; 8921 if (ClassDecl->hasTrivialDestructor()) return; 8922 if (ClassDecl->isDependentContext()) return; 8923 8924 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 8925 MarkFunctionReferenced(VD->getLocation(), Destructor); 8926 CheckDestructorAccess(VD->getLocation(), Destructor, 8927 PDiag(diag::err_access_dtor_var) 8928 << VD->getDeclName() 8929 << VD->getType()); 8930 8931 if (!VD->hasGlobalStorage()) return; 8932 8933 // Emit warning for non-trivial dtor in global scope (a real global, 8934 // class-static, function-static). 8935 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 8936 8937 // TODO: this should be re-enabled for static locals by !CXAAtExit 8938 if (!VD->isStaticLocal()) 8939 Diag(VD->getLocation(), diag::warn_global_destructor); 8940} 8941 8942/// \brief Given a constructor and the set of arguments provided for the 8943/// constructor, convert the arguments and add any required default arguments 8944/// to form a proper call to this constructor. 8945/// 8946/// \returns true if an error occurred, false otherwise. 8947bool 8948Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 8949 MultiExprArg ArgsPtr, 8950 SourceLocation Loc, 8951 ASTOwningVector<Expr*> &ConvertedArgs) { 8952 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 8953 unsigned NumArgs = ArgsPtr.size(); 8954 Expr **Args = (Expr **)ArgsPtr.get(); 8955 8956 const FunctionProtoType *Proto 8957 = Constructor->getType()->getAs<FunctionProtoType>(); 8958 assert(Proto && "Constructor without a prototype?"); 8959 unsigned NumArgsInProto = Proto->getNumArgs(); 8960 8961 // If too few arguments are available, we'll fill in the rest with defaults. 8962 if (NumArgs < NumArgsInProto) 8963 ConvertedArgs.reserve(NumArgsInProto); 8964 else 8965 ConvertedArgs.reserve(NumArgs); 8966 8967 VariadicCallType CallType = 8968 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 8969 SmallVector<Expr *, 8> AllArgs; 8970 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 8971 Proto, 0, Args, NumArgs, AllArgs, 8972 CallType); 8973 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 8974 return Invalid; 8975} 8976 8977static inline bool 8978CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 8979 const FunctionDecl *FnDecl) { 8980 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 8981 if (isa<NamespaceDecl>(DC)) { 8982 return SemaRef.Diag(FnDecl->getLocation(), 8983 diag::err_operator_new_delete_declared_in_namespace) 8984 << FnDecl->getDeclName(); 8985 } 8986 8987 if (isa<TranslationUnitDecl>(DC) && 8988 FnDecl->getStorageClass() == SC_Static) { 8989 return SemaRef.Diag(FnDecl->getLocation(), 8990 diag::err_operator_new_delete_declared_static) 8991 << FnDecl->getDeclName(); 8992 } 8993 8994 return false; 8995} 8996 8997static inline bool 8998CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 8999 CanQualType ExpectedResultType, 9000 CanQualType ExpectedFirstParamType, 9001 unsigned DependentParamTypeDiag, 9002 unsigned InvalidParamTypeDiag) { 9003 QualType ResultType = 9004 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9005 9006 // Check that the result type is not dependent. 9007 if (ResultType->isDependentType()) 9008 return SemaRef.Diag(FnDecl->getLocation(), 9009 diag::err_operator_new_delete_dependent_result_type) 9010 << FnDecl->getDeclName() << ExpectedResultType; 9011 9012 // Check that the result type is what we expect. 9013 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9014 return SemaRef.Diag(FnDecl->getLocation(), 9015 diag::err_operator_new_delete_invalid_result_type) 9016 << FnDecl->getDeclName() << ExpectedResultType; 9017 9018 // A function template must have at least 2 parameters. 9019 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9020 return SemaRef.Diag(FnDecl->getLocation(), 9021 diag::err_operator_new_delete_template_too_few_parameters) 9022 << FnDecl->getDeclName(); 9023 9024 // The function decl must have at least 1 parameter. 9025 if (FnDecl->getNumParams() == 0) 9026 return SemaRef.Diag(FnDecl->getLocation(), 9027 diag::err_operator_new_delete_too_few_parameters) 9028 << FnDecl->getDeclName(); 9029 9030 // Check the the first parameter type is not dependent. 9031 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9032 if (FirstParamType->isDependentType()) 9033 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9034 << FnDecl->getDeclName() << ExpectedFirstParamType; 9035 9036 // Check that the first parameter type is what we expect. 9037 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9038 ExpectedFirstParamType) 9039 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9040 << FnDecl->getDeclName() << ExpectedFirstParamType; 9041 9042 return false; 9043} 9044 9045static bool 9046CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9047 // C++ [basic.stc.dynamic.allocation]p1: 9048 // A program is ill-formed if an allocation function is declared in a 9049 // namespace scope other than global scope or declared static in global 9050 // scope. 9051 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9052 return true; 9053 9054 CanQualType SizeTy = 9055 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9056 9057 // C++ [basic.stc.dynamic.allocation]p1: 9058 // The return type shall be void*. The first parameter shall have type 9059 // std::size_t. 9060 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9061 SizeTy, 9062 diag::err_operator_new_dependent_param_type, 9063 diag::err_operator_new_param_type)) 9064 return true; 9065 9066 // C++ [basic.stc.dynamic.allocation]p1: 9067 // The first parameter shall not have an associated default argument. 9068 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9069 return SemaRef.Diag(FnDecl->getLocation(), 9070 diag::err_operator_new_default_arg) 9071 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9072 9073 return false; 9074} 9075 9076static bool 9077CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9078 // C++ [basic.stc.dynamic.deallocation]p1: 9079 // A program is ill-formed if deallocation functions are declared in a 9080 // namespace scope other than global scope or declared static in global 9081 // scope. 9082 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9083 return true; 9084 9085 // C++ [basic.stc.dynamic.deallocation]p2: 9086 // Each deallocation function shall return void and its first parameter 9087 // shall be void*. 9088 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9089 SemaRef.Context.VoidPtrTy, 9090 diag::err_operator_delete_dependent_param_type, 9091 diag::err_operator_delete_param_type)) 9092 return true; 9093 9094 return false; 9095} 9096 9097/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9098/// of this overloaded operator is well-formed. If so, returns false; 9099/// otherwise, emits appropriate diagnostics and returns true. 9100bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9101 assert(FnDecl && FnDecl->isOverloadedOperator() && 9102 "Expected an overloaded operator declaration"); 9103 9104 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9105 9106 // C++ [over.oper]p5: 9107 // The allocation and deallocation functions, operator new, 9108 // operator new[], operator delete and operator delete[], are 9109 // described completely in 3.7.3. The attributes and restrictions 9110 // found in the rest of this subclause do not apply to them unless 9111 // explicitly stated in 3.7.3. 9112 if (Op == OO_Delete || Op == OO_Array_Delete) 9113 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9114 9115 if (Op == OO_New || Op == OO_Array_New) 9116 return CheckOperatorNewDeclaration(*this, FnDecl); 9117 9118 // C++ [over.oper]p6: 9119 // An operator function shall either be a non-static member 9120 // function or be a non-member function and have at least one 9121 // parameter whose type is a class, a reference to a class, an 9122 // enumeration, or a reference to an enumeration. 9123 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9124 if (MethodDecl->isStatic()) 9125 return Diag(FnDecl->getLocation(), 9126 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9127 } else { 9128 bool ClassOrEnumParam = false; 9129 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9130 ParamEnd = FnDecl->param_end(); 9131 Param != ParamEnd; ++Param) { 9132 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9133 if (ParamType->isDependentType() || ParamType->isRecordType() || 9134 ParamType->isEnumeralType()) { 9135 ClassOrEnumParam = true; 9136 break; 9137 } 9138 } 9139 9140 if (!ClassOrEnumParam) 9141 return Diag(FnDecl->getLocation(), 9142 diag::err_operator_overload_needs_class_or_enum) 9143 << FnDecl->getDeclName(); 9144 } 9145 9146 // C++ [over.oper]p8: 9147 // An operator function cannot have default arguments (8.3.6), 9148 // except where explicitly stated below. 9149 // 9150 // Only the function-call operator allows default arguments 9151 // (C++ [over.call]p1). 9152 if (Op != OO_Call) { 9153 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9154 Param != FnDecl->param_end(); ++Param) { 9155 if ((*Param)->hasDefaultArg()) 9156 return Diag((*Param)->getLocation(), 9157 diag::err_operator_overload_default_arg) 9158 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9159 } 9160 } 9161 9162 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9163 { false, false, false } 9164#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9165 , { Unary, Binary, MemberOnly } 9166#include "clang/Basic/OperatorKinds.def" 9167 }; 9168 9169 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9170 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9171 bool MustBeMemberOperator = OperatorUses[Op][2]; 9172 9173 // C++ [over.oper]p8: 9174 // [...] Operator functions cannot have more or fewer parameters 9175 // than the number required for the corresponding operator, as 9176 // described in the rest of this subclause. 9177 unsigned NumParams = FnDecl->getNumParams() 9178 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9179 if (Op != OO_Call && 9180 ((NumParams == 1 && !CanBeUnaryOperator) || 9181 (NumParams == 2 && !CanBeBinaryOperator) || 9182 (NumParams < 1) || (NumParams > 2))) { 9183 // We have the wrong number of parameters. 9184 unsigned ErrorKind; 9185 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9186 ErrorKind = 2; // 2 -> unary or binary. 9187 } else if (CanBeUnaryOperator) { 9188 ErrorKind = 0; // 0 -> unary 9189 } else { 9190 assert(CanBeBinaryOperator && 9191 "All non-call overloaded operators are unary or binary!"); 9192 ErrorKind = 1; // 1 -> binary 9193 } 9194 9195 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9196 << FnDecl->getDeclName() << NumParams << ErrorKind; 9197 } 9198 9199 // Overloaded operators other than operator() cannot be variadic. 9200 if (Op != OO_Call && 9201 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9202 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9203 << FnDecl->getDeclName(); 9204 } 9205 9206 // Some operators must be non-static member functions. 9207 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9208 return Diag(FnDecl->getLocation(), 9209 diag::err_operator_overload_must_be_member) 9210 << FnDecl->getDeclName(); 9211 } 9212 9213 // C++ [over.inc]p1: 9214 // The user-defined function called operator++ implements the 9215 // prefix and postfix ++ operator. If this function is a member 9216 // function with no parameters, or a non-member function with one 9217 // parameter of class or enumeration type, it defines the prefix 9218 // increment operator ++ for objects of that type. If the function 9219 // is a member function with one parameter (which shall be of type 9220 // int) or a non-member function with two parameters (the second 9221 // of which shall be of type int), it defines the postfix 9222 // increment operator ++ for objects of that type. 9223 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9224 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9225 bool ParamIsInt = false; 9226 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9227 ParamIsInt = BT->getKind() == BuiltinType::Int; 9228 9229 if (!ParamIsInt) 9230 return Diag(LastParam->getLocation(), 9231 diag::err_operator_overload_post_incdec_must_be_int) 9232 << LastParam->getType() << (Op == OO_MinusMinus); 9233 } 9234 9235 return false; 9236} 9237 9238/// CheckLiteralOperatorDeclaration - Check whether the declaration 9239/// of this literal operator function is well-formed. If so, returns 9240/// false; otherwise, emits appropriate diagnostics and returns true. 9241bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9242 DeclContext *DC = FnDecl->getDeclContext(); 9243 Decl::Kind Kind = DC->getDeclKind(); 9244 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9245 Kind != Decl::LinkageSpec) { 9246 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9247 << FnDecl->getDeclName(); 9248 return true; 9249 } 9250 9251 bool Valid = false; 9252 9253 // template <char...> type operator "" name() is the only valid template 9254 // signature, and the only valid signature with no parameters. 9255 if (FnDecl->param_size() == 0) { 9256 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9257 // Must have only one template parameter 9258 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9259 if (Params->size() == 1) { 9260 NonTypeTemplateParmDecl *PmDecl = 9261 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9262 9263 // The template parameter must be a char parameter pack. 9264 if (PmDecl && PmDecl->isTemplateParameterPack() && 9265 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9266 Valid = true; 9267 } 9268 } 9269 } else { 9270 // Check the first parameter 9271 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9272 9273 QualType T = (*Param)->getType(); 9274 9275 // unsigned long long int, long double, and any character type are allowed 9276 // as the only parameters. 9277 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9278 Context.hasSameType(T, Context.LongDoubleTy) || 9279 Context.hasSameType(T, Context.CharTy) || 9280 Context.hasSameType(T, Context.WCharTy) || 9281 Context.hasSameType(T, Context.Char16Ty) || 9282 Context.hasSameType(T, Context.Char32Ty)) { 9283 if (++Param == FnDecl->param_end()) 9284 Valid = true; 9285 goto FinishedParams; 9286 } 9287 9288 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9289 const PointerType *PT = T->getAs<PointerType>(); 9290 if (!PT) 9291 goto FinishedParams; 9292 T = PT->getPointeeType(); 9293 if (!T.isConstQualified()) 9294 goto FinishedParams; 9295 T = T.getUnqualifiedType(); 9296 9297 // Move on to the second parameter; 9298 ++Param; 9299 9300 // If there is no second parameter, the first must be a const char * 9301 if (Param == FnDecl->param_end()) { 9302 if (Context.hasSameType(T, Context.CharTy)) 9303 Valid = true; 9304 goto FinishedParams; 9305 } 9306 9307 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9308 // are allowed as the first parameter to a two-parameter function 9309 if (!(Context.hasSameType(T, Context.CharTy) || 9310 Context.hasSameType(T, Context.WCharTy) || 9311 Context.hasSameType(T, Context.Char16Ty) || 9312 Context.hasSameType(T, Context.Char32Ty))) 9313 goto FinishedParams; 9314 9315 // The second and final parameter must be an std::size_t 9316 T = (*Param)->getType().getUnqualifiedType(); 9317 if (Context.hasSameType(T, Context.getSizeType()) && 9318 ++Param == FnDecl->param_end()) 9319 Valid = true; 9320 } 9321 9322 // FIXME: This diagnostic is absolutely terrible. 9323FinishedParams: 9324 if (!Valid) { 9325 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9326 << FnDecl->getDeclName(); 9327 return true; 9328 } 9329 9330 StringRef LiteralName 9331 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9332 if (LiteralName[0] != '_') { 9333 // C++0x [usrlit.suffix]p1: 9334 // Literal suffix identifiers that do not start with an underscore are 9335 // reserved for future standardization. 9336 bool IsHexFloat = true; 9337 if (LiteralName.size() > 1 && 9338 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9339 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9340 if (!isdigit(LiteralName[I])) { 9341 IsHexFloat = false; 9342 break; 9343 } 9344 } 9345 } 9346 9347 if (IsHexFloat) 9348 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9349 << LiteralName; 9350 else 9351 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9352 } 9353 9354 return false; 9355} 9356 9357/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9358/// linkage specification, including the language and (if present) 9359/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9360/// the location of the language string literal, which is provided 9361/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9362/// the '{' brace. Otherwise, this linkage specification does not 9363/// have any braces. 9364Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9365 SourceLocation LangLoc, 9366 StringRef Lang, 9367 SourceLocation LBraceLoc) { 9368 LinkageSpecDecl::LanguageIDs Language; 9369 if (Lang == "\"C\"") 9370 Language = LinkageSpecDecl::lang_c; 9371 else if (Lang == "\"C++\"") 9372 Language = LinkageSpecDecl::lang_cxx; 9373 else { 9374 Diag(LangLoc, diag::err_bad_language); 9375 return 0; 9376 } 9377 9378 // FIXME: Add all the various semantics of linkage specifications 9379 9380 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9381 ExternLoc, LangLoc, Language); 9382 CurContext->addDecl(D); 9383 PushDeclContext(S, D); 9384 return D; 9385} 9386 9387/// ActOnFinishLinkageSpecification - Complete the definition of 9388/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9389/// valid, it's the position of the closing '}' brace in a linkage 9390/// specification that uses braces. 9391Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9392 Decl *LinkageSpec, 9393 SourceLocation RBraceLoc) { 9394 if (LinkageSpec) { 9395 if (RBraceLoc.isValid()) { 9396 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9397 LSDecl->setRBraceLoc(RBraceLoc); 9398 } 9399 PopDeclContext(); 9400 } 9401 return LinkageSpec; 9402} 9403 9404/// \brief Perform semantic analysis for the variable declaration that 9405/// occurs within a C++ catch clause, returning the newly-created 9406/// variable. 9407VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9408 TypeSourceInfo *TInfo, 9409 SourceLocation StartLoc, 9410 SourceLocation Loc, 9411 IdentifierInfo *Name) { 9412 bool Invalid = false; 9413 QualType ExDeclType = TInfo->getType(); 9414 9415 // Arrays and functions decay. 9416 if (ExDeclType->isArrayType()) 9417 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9418 else if (ExDeclType->isFunctionType()) 9419 ExDeclType = Context.getPointerType(ExDeclType); 9420 9421 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9422 // The exception-declaration shall not denote a pointer or reference to an 9423 // incomplete type, other than [cv] void*. 9424 // N2844 forbids rvalue references. 9425 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9426 Diag(Loc, diag::err_catch_rvalue_ref); 9427 Invalid = true; 9428 } 9429 9430 QualType BaseType = ExDeclType; 9431 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9432 unsigned DK = diag::err_catch_incomplete; 9433 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9434 BaseType = Ptr->getPointeeType(); 9435 Mode = 1; 9436 DK = diag::err_catch_incomplete_ptr; 9437 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9438 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9439 BaseType = Ref->getPointeeType(); 9440 Mode = 2; 9441 DK = diag::err_catch_incomplete_ref; 9442 } 9443 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9444 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9445 Invalid = true; 9446 9447 if (!Invalid && !ExDeclType->isDependentType() && 9448 RequireNonAbstractType(Loc, ExDeclType, 9449 diag::err_abstract_type_in_decl, 9450 AbstractVariableType)) 9451 Invalid = true; 9452 9453 // Only the non-fragile NeXT runtime currently supports C++ catches 9454 // of ObjC types, and no runtime supports catching ObjC types by value. 9455 if (!Invalid && getLangOptions().ObjC1) { 9456 QualType T = ExDeclType; 9457 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9458 T = RT->getPointeeType(); 9459 9460 if (T->isObjCObjectType()) { 9461 Diag(Loc, diag::err_objc_object_catch); 9462 Invalid = true; 9463 } else if (T->isObjCObjectPointerType()) { 9464 if (!getLangOptions().ObjCNonFragileABI) 9465 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9466 } 9467 } 9468 9469 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9470 ExDeclType, TInfo, SC_None, SC_None); 9471 ExDecl->setExceptionVariable(true); 9472 9473 // In ARC, infer 'retaining' for variables of retainable type. 9474 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9475 Invalid = true; 9476 9477 if (!Invalid && !ExDeclType->isDependentType()) { 9478 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9479 // C++ [except.handle]p16: 9480 // The object declared in an exception-declaration or, if the 9481 // exception-declaration does not specify a name, a temporary (12.2) is 9482 // copy-initialized (8.5) from the exception object. [...] 9483 // The object is destroyed when the handler exits, after the destruction 9484 // of any automatic objects initialized within the handler. 9485 // 9486 // We just pretend to initialize the object with itself, then make sure 9487 // it can be destroyed later. 9488 QualType initType = ExDeclType; 9489 9490 InitializedEntity entity = 9491 InitializedEntity::InitializeVariable(ExDecl); 9492 InitializationKind initKind = 9493 InitializationKind::CreateCopy(Loc, SourceLocation()); 9494 9495 Expr *opaqueValue = 9496 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9497 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9498 ExprResult result = sequence.Perform(*this, entity, initKind, 9499 MultiExprArg(&opaqueValue, 1)); 9500 if (result.isInvalid()) 9501 Invalid = true; 9502 else { 9503 // If the constructor used was non-trivial, set this as the 9504 // "initializer". 9505 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9506 if (!construct->getConstructor()->isTrivial()) { 9507 Expr *init = MaybeCreateExprWithCleanups(construct); 9508 ExDecl->setInit(init); 9509 } 9510 9511 // And make sure it's destructable. 9512 FinalizeVarWithDestructor(ExDecl, recordType); 9513 } 9514 } 9515 } 9516 9517 if (Invalid) 9518 ExDecl->setInvalidDecl(); 9519 9520 return ExDecl; 9521} 9522 9523/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9524/// handler. 9525Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9526 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9527 bool Invalid = D.isInvalidType(); 9528 9529 // Check for unexpanded parameter packs. 9530 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9531 UPPC_ExceptionType)) { 9532 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9533 D.getIdentifierLoc()); 9534 Invalid = true; 9535 } 9536 9537 IdentifierInfo *II = D.getIdentifier(); 9538 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9539 LookupOrdinaryName, 9540 ForRedeclaration)) { 9541 // The scope should be freshly made just for us. There is just no way 9542 // it contains any previous declaration. 9543 assert(!S->isDeclScope(PrevDecl)); 9544 if (PrevDecl->isTemplateParameter()) { 9545 // Maybe we will complain about the shadowed template parameter. 9546 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9547 PrevDecl = 0; 9548 } 9549 } 9550 9551 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9552 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9553 << D.getCXXScopeSpec().getRange(); 9554 Invalid = true; 9555 } 9556 9557 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9558 D.getSourceRange().getBegin(), 9559 D.getIdentifierLoc(), 9560 D.getIdentifier()); 9561 if (Invalid) 9562 ExDecl->setInvalidDecl(); 9563 9564 // Add the exception declaration into this scope. 9565 if (II) 9566 PushOnScopeChains(ExDecl, S); 9567 else 9568 CurContext->addDecl(ExDecl); 9569 9570 ProcessDeclAttributes(S, ExDecl, D); 9571 return ExDecl; 9572} 9573 9574Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9575 Expr *AssertExpr, 9576 Expr *AssertMessageExpr_, 9577 SourceLocation RParenLoc) { 9578 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9579 9580 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9581 // In a static_assert-declaration, the constant-expression shall be a 9582 // constant expression that can be contextually converted to bool. 9583 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9584 if (Converted.isInvalid()) 9585 return 0; 9586 9587 llvm::APSInt Cond; 9588 if (VerifyIntegerConstantExpression(Converted.get(), &Cond, 9589 PDiag(diag::err_static_assert_expression_is_not_constant), 9590 /*AllowFold=*/false).isInvalid()) 9591 return 0; 9592 9593 if (!Cond) 9594 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9595 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9596 } 9597 9598 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9599 return 0; 9600 9601 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9602 AssertExpr, AssertMessage, RParenLoc); 9603 9604 CurContext->addDecl(Decl); 9605 return Decl; 9606} 9607 9608/// \brief Perform semantic analysis of the given friend type declaration. 9609/// 9610/// \returns A friend declaration that. 9611FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9612 SourceLocation FriendLoc, 9613 TypeSourceInfo *TSInfo) { 9614 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9615 9616 QualType T = TSInfo->getType(); 9617 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9618 9619 // C++03 [class.friend]p2: 9620 // An elaborated-type-specifier shall be used in a friend declaration 9621 // for a class.* 9622 // 9623 // * The class-key of the elaborated-type-specifier is required. 9624 if (!ActiveTemplateInstantiations.empty()) { 9625 // Do not complain about the form of friend template types during 9626 // template instantiation; we will already have complained when the 9627 // template was declared. 9628 } else if (!T->isElaboratedTypeSpecifier()) { 9629 // If we evaluated the type to a record type, suggest putting 9630 // a tag in front. 9631 if (const RecordType *RT = T->getAs<RecordType>()) { 9632 RecordDecl *RD = RT->getDecl(); 9633 9634 std::string InsertionText = std::string(" ") + RD->getKindName(); 9635 9636 Diag(TypeRange.getBegin(), 9637 getLangOptions().CPlusPlus0x ? 9638 diag::warn_cxx98_compat_unelaborated_friend_type : 9639 diag::ext_unelaborated_friend_type) 9640 << (unsigned) RD->getTagKind() 9641 << T 9642 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9643 InsertionText); 9644 } else { 9645 Diag(FriendLoc, 9646 getLangOptions().CPlusPlus0x ? 9647 diag::warn_cxx98_compat_nonclass_type_friend : 9648 diag::ext_nonclass_type_friend) 9649 << T 9650 << SourceRange(FriendLoc, TypeRange.getEnd()); 9651 } 9652 } else if (T->getAs<EnumType>()) { 9653 Diag(FriendLoc, 9654 getLangOptions().CPlusPlus0x ? 9655 diag::warn_cxx98_compat_enum_friend : 9656 diag::ext_enum_friend) 9657 << T 9658 << SourceRange(FriendLoc, TypeRange.getEnd()); 9659 } 9660 9661 // C++0x [class.friend]p3: 9662 // If the type specifier in a friend declaration designates a (possibly 9663 // cv-qualified) class type, that class is declared as a friend; otherwise, 9664 // the friend declaration is ignored. 9665 9666 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9667 // in [class.friend]p3 that we do not implement. 9668 9669 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9670} 9671 9672/// Handle a friend tag declaration where the scope specifier was 9673/// templated. 9674Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9675 unsigned TagSpec, SourceLocation TagLoc, 9676 CXXScopeSpec &SS, 9677 IdentifierInfo *Name, SourceLocation NameLoc, 9678 AttributeList *Attr, 9679 MultiTemplateParamsArg TempParamLists) { 9680 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9681 9682 bool isExplicitSpecialization = false; 9683 bool Invalid = false; 9684 9685 if (TemplateParameterList *TemplateParams 9686 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9687 TempParamLists.get(), 9688 TempParamLists.size(), 9689 /*friend*/ true, 9690 isExplicitSpecialization, 9691 Invalid)) { 9692 if (TemplateParams->size() > 0) { 9693 // This is a declaration of a class template. 9694 if (Invalid) 9695 return 0; 9696 9697 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9698 SS, Name, NameLoc, Attr, 9699 TemplateParams, AS_public, 9700 /*ModulePrivateLoc=*/SourceLocation(), 9701 TempParamLists.size() - 1, 9702 (TemplateParameterList**) TempParamLists.release()).take(); 9703 } else { 9704 // The "template<>" header is extraneous. 9705 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9706 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9707 isExplicitSpecialization = true; 9708 } 9709 } 9710 9711 if (Invalid) return 0; 9712 9713 bool isAllExplicitSpecializations = true; 9714 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9715 if (TempParamLists.get()[I]->size()) { 9716 isAllExplicitSpecializations = false; 9717 break; 9718 } 9719 } 9720 9721 // FIXME: don't ignore attributes. 9722 9723 // If it's explicit specializations all the way down, just forget 9724 // about the template header and build an appropriate non-templated 9725 // friend. TODO: for source fidelity, remember the headers. 9726 if (isAllExplicitSpecializations) { 9727 if (SS.isEmpty()) { 9728 bool Owned = false; 9729 bool IsDependent = false; 9730 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9731 Attr, AS_public, 9732 /*ModulePrivateLoc=*/SourceLocation(), 9733 MultiTemplateParamsArg(), Owned, IsDependent, 9734 /*ScopedEnumKWLoc=*/SourceLocation(), 9735 /*ScopedEnumUsesClassTag=*/false, 9736 /*UnderlyingType=*/TypeResult()); 9737 } 9738 9739 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9740 ElaboratedTypeKeyword Keyword 9741 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9742 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9743 *Name, NameLoc); 9744 if (T.isNull()) 9745 return 0; 9746 9747 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9748 if (isa<DependentNameType>(T)) { 9749 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9750 TL.setElaboratedKeywordLoc(TagLoc); 9751 TL.setQualifierLoc(QualifierLoc); 9752 TL.setNameLoc(NameLoc); 9753 } else { 9754 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9755 TL.setElaboratedKeywordLoc(TagLoc); 9756 TL.setQualifierLoc(QualifierLoc); 9757 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9758 } 9759 9760 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9761 TSI, FriendLoc); 9762 Friend->setAccess(AS_public); 9763 CurContext->addDecl(Friend); 9764 return Friend; 9765 } 9766 9767 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9768 9769 9770 9771 // Handle the case of a templated-scope friend class. e.g. 9772 // template <class T> class A<T>::B; 9773 // FIXME: we don't support these right now. 9774 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9775 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9776 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9777 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9778 TL.setElaboratedKeywordLoc(TagLoc); 9779 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9780 TL.setNameLoc(NameLoc); 9781 9782 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9783 TSI, FriendLoc); 9784 Friend->setAccess(AS_public); 9785 Friend->setUnsupportedFriend(true); 9786 CurContext->addDecl(Friend); 9787 return Friend; 9788} 9789 9790 9791/// Handle a friend type declaration. This works in tandem with 9792/// ActOnTag. 9793/// 9794/// Notes on friend class templates: 9795/// 9796/// We generally treat friend class declarations as if they were 9797/// declaring a class. So, for example, the elaborated type specifier 9798/// in a friend declaration is required to obey the restrictions of a 9799/// class-head (i.e. no typedefs in the scope chain), template 9800/// parameters are required to match up with simple template-ids, &c. 9801/// However, unlike when declaring a template specialization, it's 9802/// okay to refer to a template specialization without an empty 9803/// template parameter declaration, e.g. 9804/// friend class A<T>::B<unsigned>; 9805/// We permit this as a special case; if there are any template 9806/// parameters present at all, require proper matching, i.e. 9807/// template <> template <class T> friend class A<int>::B; 9808Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9809 MultiTemplateParamsArg TempParams) { 9810 SourceLocation Loc = DS.getSourceRange().getBegin(); 9811 9812 assert(DS.isFriendSpecified()); 9813 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9814 9815 // Try to convert the decl specifier to a type. This works for 9816 // friend templates because ActOnTag never produces a ClassTemplateDecl 9817 // for a TUK_Friend. 9818 Declarator TheDeclarator(DS, Declarator::MemberContext); 9819 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9820 QualType T = TSI->getType(); 9821 if (TheDeclarator.isInvalidType()) 9822 return 0; 9823 9824 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9825 return 0; 9826 9827 // This is definitely an error in C++98. It's probably meant to 9828 // be forbidden in C++0x, too, but the specification is just 9829 // poorly written. 9830 // 9831 // The problem is with declarations like the following: 9832 // template <T> friend A<T>::foo; 9833 // where deciding whether a class C is a friend or not now hinges 9834 // on whether there exists an instantiation of A that causes 9835 // 'foo' to equal C. There are restrictions on class-heads 9836 // (which we declare (by fiat) elaborated friend declarations to 9837 // be) that makes this tractable. 9838 // 9839 // FIXME: handle "template <> friend class A<T>;", which 9840 // is possibly well-formed? Who even knows? 9841 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9842 Diag(Loc, diag::err_tagless_friend_type_template) 9843 << DS.getSourceRange(); 9844 return 0; 9845 } 9846 9847 // C++98 [class.friend]p1: A friend of a class is a function 9848 // or class that is not a member of the class . . . 9849 // This is fixed in DR77, which just barely didn't make the C++03 9850 // deadline. It's also a very silly restriction that seriously 9851 // affects inner classes and which nobody else seems to implement; 9852 // thus we never diagnose it, not even in -pedantic. 9853 // 9854 // But note that we could warn about it: it's always useless to 9855 // friend one of your own members (it's not, however, worthless to 9856 // friend a member of an arbitrary specialization of your template). 9857 9858 Decl *D; 9859 if (unsigned NumTempParamLists = TempParams.size()) 9860 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9861 NumTempParamLists, 9862 TempParams.release(), 9863 TSI, 9864 DS.getFriendSpecLoc()); 9865 else 9866 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 9867 9868 if (!D) 9869 return 0; 9870 9871 D->setAccess(AS_public); 9872 CurContext->addDecl(D); 9873 9874 return D; 9875} 9876 9877Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 9878 MultiTemplateParamsArg TemplateParams) { 9879 const DeclSpec &DS = D.getDeclSpec(); 9880 9881 assert(DS.isFriendSpecified()); 9882 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9883 9884 SourceLocation Loc = D.getIdentifierLoc(); 9885 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9886 9887 // C++ [class.friend]p1 9888 // A friend of a class is a function or class.... 9889 // Note that this sees through typedefs, which is intended. 9890 // It *doesn't* see through dependent types, which is correct 9891 // according to [temp.arg.type]p3: 9892 // If a declaration acquires a function type through a 9893 // type dependent on a template-parameter and this causes 9894 // a declaration that does not use the syntactic form of a 9895 // function declarator to have a function type, the program 9896 // is ill-formed. 9897 if (!TInfo->getType()->isFunctionType()) { 9898 Diag(Loc, diag::err_unexpected_friend); 9899 9900 // It might be worthwhile to try to recover by creating an 9901 // appropriate declaration. 9902 return 0; 9903 } 9904 9905 // C++ [namespace.memdef]p3 9906 // - If a friend declaration in a non-local class first declares a 9907 // class or function, the friend class or function is a member 9908 // of the innermost enclosing namespace. 9909 // - The name of the friend is not found by simple name lookup 9910 // until a matching declaration is provided in that namespace 9911 // scope (either before or after the class declaration granting 9912 // friendship). 9913 // - If a friend function is called, its name may be found by the 9914 // name lookup that considers functions from namespaces and 9915 // classes associated with the types of the function arguments. 9916 // - When looking for a prior declaration of a class or a function 9917 // declared as a friend, scopes outside the innermost enclosing 9918 // namespace scope are not considered. 9919 9920 CXXScopeSpec &SS = D.getCXXScopeSpec(); 9921 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 9922 DeclarationName Name = NameInfo.getName(); 9923 assert(Name); 9924 9925 // Check for unexpanded parameter packs. 9926 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 9927 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 9928 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 9929 return 0; 9930 9931 // The context we found the declaration in, or in which we should 9932 // create the declaration. 9933 DeclContext *DC; 9934 Scope *DCScope = S; 9935 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 9936 ForRedeclaration); 9937 9938 // FIXME: there are different rules in local classes 9939 9940 // There are four cases here. 9941 // - There's no scope specifier, in which case we just go to the 9942 // appropriate scope and look for a function or function template 9943 // there as appropriate. 9944 // Recover from invalid scope qualifiers as if they just weren't there. 9945 if (SS.isInvalid() || !SS.isSet()) { 9946 // C++0x [namespace.memdef]p3: 9947 // If the name in a friend declaration is neither qualified nor 9948 // a template-id and the declaration is a function or an 9949 // elaborated-type-specifier, the lookup to determine whether 9950 // the entity has been previously declared shall not consider 9951 // any scopes outside the innermost enclosing namespace. 9952 // C++0x [class.friend]p11: 9953 // If a friend declaration appears in a local class and the name 9954 // specified is an unqualified name, a prior declaration is 9955 // looked up without considering scopes that are outside the 9956 // innermost enclosing non-class scope. For a friend function 9957 // declaration, if there is no prior declaration, the program is 9958 // ill-formed. 9959 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 9960 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 9961 9962 // Find the appropriate context according to the above. 9963 DC = CurContext; 9964 while (true) { 9965 // Skip class contexts. If someone can cite chapter and verse 9966 // for this behavior, that would be nice --- it's what GCC and 9967 // EDG do, and it seems like a reasonable intent, but the spec 9968 // really only says that checks for unqualified existing 9969 // declarations should stop at the nearest enclosing namespace, 9970 // not that they should only consider the nearest enclosing 9971 // namespace. 9972 while (DC->isRecord()) 9973 DC = DC->getParent(); 9974 9975 LookupQualifiedName(Previous, DC); 9976 9977 // TODO: decide what we think about using declarations. 9978 if (isLocal || !Previous.empty()) 9979 break; 9980 9981 if (isTemplateId) { 9982 if (isa<TranslationUnitDecl>(DC)) break; 9983 } else { 9984 if (DC->isFileContext()) break; 9985 } 9986 DC = DC->getParent(); 9987 } 9988 9989 // C++ [class.friend]p1: A friend of a class is a function or 9990 // class that is not a member of the class . . . 9991 // C++11 changes this for both friend types and functions. 9992 // Most C++ 98 compilers do seem to give an error here, so 9993 // we do, too. 9994 if (!Previous.empty() && DC->Equals(CurContext)) 9995 Diag(DS.getFriendSpecLoc(), 9996 getLangOptions().CPlusPlus0x ? 9997 diag::warn_cxx98_compat_friend_is_member : 9998 diag::err_friend_is_member); 9999 10000 DCScope = getScopeForDeclContext(S, DC); 10001 10002 // C++ [class.friend]p6: 10003 // A function can be defined in a friend declaration of a class if and 10004 // only if the class is a non-local class (9.8), the function name is 10005 // unqualified, and the function has namespace scope. 10006 if (isLocal && D.isFunctionDefinition()) { 10007 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10008 } 10009 10010 // - There's a non-dependent scope specifier, in which case we 10011 // compute it and do a previous lookup there for a function 10012 // or function template. 10013 } else if (!SS.getScopeRep()->isDependent()) { 10014 DC = computeDeclContext(SS); 10015 if (!DC) return 0; 10016 10017 if (RequireCompleteDeclContext(SS, DC)) return 0; 10018 10019 LookupQualifiedName(Previous, DC); 10020 10021 // Ignore things found implicitly in the wrong scope. 10022 // TODO: better diagnostics for this case. Suggesting the right 10023 // qualified scope would be nice... 10024 LookupResult::Filter F = Previous.makeFilter(); 10025 while (F.hasNext()) { 10026 NamedDecl *D = F.next(); 10027 if (!DC->InEnclosingNamespaceSetOf( 10028 D->getDeclContext()->getRedeclContext())) 10029 F.erase(); 10030 } 10031 F.done(); 10032 10033 if (Previous.empty()) { 10034 D.setInvalidType(); 10035 Diag(Loc, diag::err_qualified_friend_not_found) 10036 << Name << TInfo->getType(); 10037 return 0; 10038 } 10039 10040 // C++ [class.friend]p1: A friend of a class is a function or 10041 // class that is not a member of the class . . . 10042 if (DC->Equals(CurContext)) 10043 Diag(DS.getFriendSpecLoc(), 10044 getLangOptions().CPlusPlus0x ? 10045 diag::warn_cxx98_compat_friend_is_member : 10046 diag::err_friend_is_member); 10047 10048 if (D.isFunctionDefinition()) { 10049 // C++ [class.friend]p6: 10050 // A function can be defined in a friend declaration of a class if and 10051 // only if the class is a non-local class (9.8), the function name is 10052 // unqualified, and the function has namespace scope. 10053 SemaDiagnosticBuilder DB 10054 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10055 10056 DB << SS.getScopeRep(); 10057 if (DC->isFileContext()) 10058 DB << FixItHint::CreateRemoval(SS.getRange()); 10059 SS.clear(); 10060 } 10061 10062 // - There's a scope specifier that does not match any template 10063 // parameter lists, in which case we use some arbitrary context, 10064 // create a method or method template, and wait for instantiation. 10065 // - There's a scope specifier that does match some template 10066 // parameter lists, which we don't handle right now. 10067 } else { 10068 if (D.isFunctionDefinition()) { 10069 // C++ [class.friend]p6: 10070 // A function can be defined in a friend declaration of a class if and 10071 // only if the class is a non-local class (9.8), the function name is 10072 // unqualified, and the function has namespace scope. 10073 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10074 << SS.getScopeRep(); 10075 } 10076 10077 DC = CurContext; 10078 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10079 } 10080 10081 if (!DC->isRecord()) { 10082 // This implies that it has to be an operator or function. 10083 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10084 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10085 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10086 Diag(Loc, diag::err_introducing_special_friend) << 10087 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10088 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10089 return 0; 10090 } 10091 } 10092 10093 // FIXME: This is an egregious hack to cope with cases where the scope stack 10094 // does not contain the declaration context, i.e., in an out-of-line 10095 // definition of a class. 10096 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10097 if (!DCScope) { 10098 FakeDCScope.setEntity(DC); 10099 DCScope = &FakeDCScope; 10100 } 10101 10102 bool AddToScope = true; 10103 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10104 move(TemplateParams), AddToScope); 10105 if (!ND) return 0; 10106 10107 assert(ND->getDeclContext() == DC); 10108 assert(ND->getLexicalDeclContext() == CurContext); 10109 10110 // Add the function declaration to the appropriate lookup tables, 10111 // adjusting the redeclarations list as necessary. We don't 10112 // want to do this yet if the friending class is dependent. 10113 // 10114 // Also update the scope-based lookup if the target context's 10115 // lookup context is in lexical scope. 10116 if (!CurContext->isDependentContext()) { 10117 DC = DC->getRedeclContext(); 10118 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10119 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10120 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10121 } 10122 10123 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10124 D.getIdentifierLoc(), ND, 10125 DS.getFriendSpecLoc()); 10126 FrD->setAccess(AS_public); 10127 CurContext->addDecl(FrD); 10128 10129 if (ND->isInvalidDecl()) 10130 FrD->setInvalidDecl(); 10131 else { 10132 FunctionDecl *FD; 10133 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10134 FD = FTD->getTemplatedDecl(); 10135 else 10136 FD = cast<FunctionDecl>(ND); 10137 10138 // Mark templated-scope function declarations as unsupported. 10139 if (FD->getNumTemplateParameterLists()) 10140 FrD->setUnsupportedFriend(true); 10141 } 10142 10143 return ND; 10144} 10145 10146void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10147 AdjustDeclIfTemplate(Dcl); 10148 10149 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10150 if (!Fn) { 10151 Diag(DelLoc, diag::err_deleted_non_function); 10152 return; 10153 } 10154 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10155 Diag(DelLoc, diag::err_deleted_decl_not_first); 10156 Diag(Prev->getLocation(), diag::note_previous_declaration); 10157 // If the declaration wasn't the first, we delete the function anyway for 10158 // recovery. 10159 } 10160 Fn->setDeletedAsWritten(); 10161} 10162 10163void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10164 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10165 10166 if (MD) { 10167 if (MD->getParent()->isDependentType()) { 10168 MD->setDefaulted(); 10169 MD->setExplicitlyDefaulted(); 10170 return; 10171 } 10172 10173 CXXSpecialMember Member = getSpecialMember(MD); 10174 if (Member == CXXInvalid) { 10175 Diag(DefaultLoc, diag::err_default_special_members); 10176 return; 10177 } 10178 10179 MD->setDefaulted(); 10180 MD->setExplicitlyDefaulted(); 10181 10182 // If this definition appears within the record, do the checking when 10183 // the record is complete. 10184 const FunctionDecl *Primary = MD; 10185 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10186 // Find the uninstantiated declaration that actually had the '= default' 10187 // on it. 10188 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10189 10190 if (Primary == Primary->getCanonicalDecl()) 10191 return; 10192 10193 switch (Member) { 10194 case CXXDefaultConstructor: { 10195 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10196 CheckExplicitlyDefaultedDefaultConstructor(CD); 10197 if (!CD->isInvalidDecl()) 10198 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10199 break; 10200 } 10201 10202 case CXXCopyConstructor: { 10203 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10204 CheckExplicitlyDefaultedCopyConstructor(CD); 10205 if (!CD->isInvalidDecl()) 10206 DefineImplicitCopyConstructor(DefaultLoc, CD); 10207 break; 10208 } 10209 10210 case CXXCopyAssignment: { 10211 CheckExplicitlyDefaultedCopyAssignment(MD); 10212 if (!MD->isInvalidDecl()) 10213 DefineImplicitCopyAssignment(DefaultLoc, MD); 10214 break; 10215 } 10216 10217 case CXXDestructor: { 10218 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10219 CheckExplicitlyDefaultedDestructor(DD); 10220 if (!DD->isInvalidDecl()) 10221 DefineImplicitDestructor(DefaultLoc, DD); 10222 break; 10223 } 10224 10225 case CXXMoveConstructor: { 10226 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10227 CheckExplicitlyDefaultedMoveConstructor(CD); 10228 if (!CD->isInvalidDecl()) 10229 DefineImplicitMoveConstructor(DefaultLoc, CD); 10230 break; 10231 } 10232 10233 case CXXMoveAssignment: { 10234 CheckExplicitlyDefaultedMoveAssignment(MD); 10235 if (!MD->isInvalidDecl()) 10236 DefineImplicitMoveAssignment(DefaultLoc, MD); 10237 break; 10238 } 10239 10240 case CXXInvalid: 10241 llvm_unreachable("Invalid special member."); 10242 } 10243 } else { 10244 Diag(DefaultLoc, diag::err_default_special_members); 10245 } 10246} 10247 10248static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10249 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10250 Stmt *SubStmt = *CI; 10251 if (!SubStmt) 10252 continue; 10253 if (isa<ReturnStmt>(SubStmt)) 10254 Self.Diag(SubStmt->getSourceRange().getBegin(), 10255 diag::err_return_in_constructor_handler); 10256 if (!isa<Expr>(SubStmt)) 10257 SearchForReturnInStmt(Self, SubStmt); 10258 } 10259} 10260 10261void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10262 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10263 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10264 SearchForReturnInStmt(*this, Handler); 10265 } 10266} 10267 10268bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10269 const CXXMethodDecl *Old) { 10270 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10271 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10272 10273 if (Context.hasSameType(NewTy, OldTy) || 10274 NewTy->isDependentType() || OldTy->isDependentType()) 10275 return false; 10276 10277 // Check if the return types are covariant 10278 QualType NewClassTy, OldClassTy; 10279 10280 /// Both types must be pointers or references to classes. 10281 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10282 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10283 NewClassTy = NewPT->getPointeeType(); 10284 OldClassTy = OldPT->getPointeeType(); 10285 } 10286 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10287 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10288 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10289 NewClassTy = NewRT->getPointeeType(); 10290 OldClassTy = OldRT->getPointeeType(); 10291 } 10292 } 10293 } 10294 10295 // The return types aren't either both pointers or references to a class type. 10296 if (NewClassTy.isNull()) { 10297 Diag(New->getLocation(), 10298 diag::err_different_return_type_for_overriding_virtual_function) 10299 << New->getDeclName() << NewTy << OldTy; 10300 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10301 10302 return true; 10303 } 10304 10305 // C++ [class.virtual]p6: 10306 // If the return type of D::f differs from the return type of B::f, the 10307 // class type in the return type of D::f shall be complete at the point of 10308 // declaration of D::f or shall be the class type D. 10309 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10310 if (!RT->isBeingDefined() && 10311 RequireCompleteType(New->getLocation(), NewClassTy, 10312 PDiag(diag::err_covariant_return_incomplete) 10313 << New->getDeclName())) 10314 return true; 10315 } 10316 10317 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10318 // Check if the new class derives from the old class. 10319 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10320 Diag(New->getLocation(), 10321 diag::err_covariant_return_not_derived) 10322 << New->getDeclName() << NewTy << OldTy; 10323 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10324 return true; 10325 } 10326 10327 // Check if we the conversion from derived to base is valid. 10328 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10329 diag::err_covariant_return_inaccessible_base, 10330 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10331 // FIXME: Should this point to the return type? 10332 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10333 // FIXME: this note won't trigger for delayed access control 10334 // diagnostics, and it's impossible to get an undelayed error 10335 // here from access control during the original parse because 10336 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10337 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10338 return true; 10339 } 10340 } 10341 10342 // The qualifiers of the return types must be the same. 10343 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10344 Diag(New->getLocation(), 10345 diag::err_covariant_return_type_different_qualifications) 10346 << New->getDeclName() << NewTy << OldTy; 10347 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10348 return true; 10349 }; 10350 10351 10352 // The new class type must have the same or less qualifiers as the old type. 10353 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10354 Diag(New->getLocation(), 10355 diag::err_covariant_return_type_class_type_more_qualified) 10356 << New->getDeclName() << NewTy << OldTy; 10357 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10358 return true; 10359 }; 10360 10361 return false; 10362} 10363 10364/// \brief Mark the given method pure. 10365/// 10366/// \param Method the method to be marked pure. 10367/// 10368/// \param InitRange the source range that covers the "0" initializer. 10369bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10370 SourceLocation EndLoc = InitRange.getEnd(); 10371 if (EndLoc.isValid()) 10372 Method->setRangeEnd(EndLoc); 10373 10374 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10375 Method->setPure(); 10376 return false; 10377 } 10378 10379 if (!Method->isInvalidDecl()) 10380 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10381 << Method->getDeclName() << InitRange; 10382 return true; 10383} 10384 10385/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10386/// an initializer for the out-of-line declaration 'Dcl'. The scope 10387/// is a fresh scope pushed for just this purpose. 10388/// 10389/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10390/// static data member of class X, names should be looked up in the scope of 10391/// class X. 10392void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10393 // If there is no declaration, there was an error parsing it. 10394 if (D == 0 || D->isInvalidDecl()) return; 10395 10396 // We should only get called for declarations with scope specifiers, like: 10397 // int foo::bar; 10398 assert(D->isOutOfLine()); 10399 EnterDeclaratorContext(S, D->getDeclContext()); 10400} 10401 10402/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10403/// initializer for the out-of-line declaration 'D'. 10404void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10405 // If there is no declaration, there was an error parsing it. 10406 if (D == 0 || D->isInvalidDecl()) return; 10407 10408 assert(D->isOutOfLine()); 10409 ExitDeclaratorContext(S); 10410} 10411 10412/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10413/// C++ if/switch/while/for statement. 10414/// e.g: "if (int x = f()) {...}" 10415DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10416 // C++ 6.4p2: 10417 // The declarator shall not specify a function or an array. 10418 // The type-specifier-seq shall not contain typedef and shall not declare a 10419 // new class or enumeration. 10420 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10421 "Parser allowed 'typedef' as storage class of condition decl."); 10422 10423 Decl *Dcl = ActOnDeclarator(S, D); 10424 if (!Dcl) 10425 return true; 10426 10427 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10428 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10429 << D.getSourceRange(); 10430 return true; 10431 } 10432 10433 return Dcl; 10434} 10435 10436void Sema::LoadExternalVTableUses() { 10437 if (!ExternalSource) 10438 return; 10439 10440 SmallVector<ExternalVTableUse, 4> VTables; 10441 ExternalSource->ReadUsedVTables(VTables); 10442 SmallVector<VTableUse, 4> NewUses; 10443 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10444 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10445 = VTablesUsed.find(VTables[I].Record); 10446 // Even if a definition wasn't required before, it may be required now. 10447 if (Pos != VTablesUsed.end()) { 10448 if (!Pos->second && VTables[I].DefinitionRequired) 10449 Pos->second = true; 10450 continue; 10451 } 10452 10453 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10454 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10455 } 10456 10457 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10458} 10459 10460void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10461 bool DefinitionRequired) { 10462 // Ignore any vtable uses in unevaluated operands or for classes that do 10463 // not have a vtable. 10464 if (!Class->isDynamicClass() || Class->isDependentContext() || 10465 CurContext->isDependentContext() || 10466 ExprEvalContexts.back().Context == Unevaluated) 10467 return; 10468 10469 // Try to insert this class into the map. 10470 LoadExternalVTableUses(); 10471 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10472 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10473 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10474 if (!Pos.second) { 10475 // If we already had an entry, check to see if we are promoting this vtable 10476 // to required a definition. If so, we need to reappend to the VTableUses 10477 // list, since we may have already processed the first entry. 10478 if (DefinitionRequired && !Pos.first->second) { 10479 Pos.first->second = true; 10480 } else { 10481 // Otherwise, we can early exit. 10482 return; 10483 } 10484 } 10485 10486 // Local classes need to have their virtual members marked 10487 // immediately. For all other classes, we mark their virtual members 10488 // at the end of the translation unit. 10489 if (Class->isLocalClass()) 10490 MarkVirtualMembersReferenced(Loc, Class); 10491 else 10492 VTableUses.push_back(std::make_pair(Class, Loc)); 10493} 10494 10495bool Sema::DefineUsedVTables() { 10496 LoadExternalVTableUses(); 10497 if (VTableUses.empty()) 10498 return false; 10499 10500 // Note: The VTableUses vector could grow as a result of marking 10501 // the members of a class as "used", so we check the size each 10502 // time through the loop and prefer indices (with are stable) to 10503 // iterators (which are not). 10504 bool DefinedAnything = false; 10505 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10506 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10507 if (!Class) 10508 continue; 10509 10510 SourceLocation Loc = VTableUses[I].second; 10511 10512 // If this class has a key function, but that key function is 10513 // defined in another translation unit, we don't need to emit the 10514 // vtable even though we're using it. 10515 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10516 if (KeyFunction && !KeyFunction->hasBody()) { 10517 switch (KeyFunction->getTemplateSpecializationKind()) { 10518 case TSK_Undeclared: 10519 case TSK_ExplicitSpecialization: 10520 case TSK_ExplicitInstantiationDeclaration: 10521 // The key function is in another translation unit. 10522 continue; 10523 10524 case TSK_ExplicitInstantiationDefinition: 10525 case TSK_ImplicitInstantiation: 10526 // We will be instantiating the key function. 10527 break; 10528 } 10529 } else if (!KeyFunction) { 10530 // If we have a class with no key function that is the subject 10531 // of an explicit instantiation declaration, suppress the 10532 // vtable; it will live with the explicit instantiation 10533 // definition. 10534 bool IsExplicitInstantiationDeclaration 10535 = Class->getTemplateSpecializationKind() 10536 == TSK_ExplicitInstantiationDeclaration; 10537 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10538 REnd = Class->redecls_end(); 10539 R != REnd; ++R) { 10540 TemplateSpecializationKind TSK 10541 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10542 if (TSK == TSK_ExplicitInstantiationDeclaration) 10543 IsExplicitInstantiationDeclaration = true; 10544 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10545 IsExplicitInstantiationDeclaration = false; 10546 break; 10547 } 10548 } 10549 10550 if (IsExplicitInstantiationDeclaration) 10551 continue; 10552 } 10553 10554 // Mark all of the virtual members of this class as referenced, so 10555 // that we can build a vtable. Then, tell the AST consumer that a 10556 // vtable for this class is required. 10557 DefinedAnything = true; 10558 MarkVirtualMembersReferenced(Loc, Class); 10559 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10560 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10561 10562 // Optionally warn if we're emitting a weak vtable. 10563 if (Class->getLinkage() == ExternalLinkage && 10564 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10565 const FunctionDecl *KeyFunctionDef = 0; 10566 if (!KeyFunction || 10567 (KeyFunction->hasBody(KeyFunctionDef) && 10568 KeyFunctionDef->isInlined())) 10569 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10570 TSK_ExplicitInstantiationDefinition 10571 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10572 << Class; 10573 } 10574 } 10575 VTableUses.clear(); 10576 10577 return DefinedAnything; 10578} 10579 10580void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10581 const CXXRecordDecl *RD) { 10582 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10583 e = RD->method_end(); i != e; ++i) { 10584 CXXMethodDecl *MD = *i; 10585 10586 // C++ [basic.def.odr]p2: 10587 // [...] A virtual member function is used if it is not pure. [...] 10588 if (MD->isVirtual() && !MD->isPure()) 10589 MarkFunctionReferenced(Loc, MD); 10590 } 10591 10592 // Only classes that have virtual bases need a VTT. 10593 if (RD->getNumVBases() == 0) 10594 return; 10595 10596 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10597 e = RD->bases_end(); i != e; ++i) { 10598 const CXXRecordDecl *Base = 10599 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10600 if (Base->getNumVBases() == 0) 10601 continue; 10602 MarkVirtualMembersReferenced(Loc, Base); 10603 } 10604} 10605 10606/// SetIvarInitializers - This routine builds initialization ASTs for the 10607/// Objective-C implementation whose ivars need be initialized. 10608void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10609 if (!getLangOptions().CPlusPlus) 10610 return; 10611 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10612 SmallVector<ObjCIvarDecl*, 8> ivars; 10613 CollectIvarsToConstructOrDestruct(OID, ivars); 10614 if (ivars.empty()) 10615 return; 10616 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10617 for (unsigned i = 0; i < ivars.size(); i++) { 10618 FieldDecl *Field = ivars[i]; 10619 if (Field->isInvalidDecl()) 10620 continue; 10621 10622 CXXCtorInitializer *Member; 10623 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10624 InitializationKind InitKind = 10625 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10626 10627 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10628 ExprResult MemberInit = 10629 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10630 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10631 // Note, MemberInit could actually come back empty if no initialization 10632 // is required (e.g., because it would call a trivial default constructor) 10633 if (!MemberInit.get() || MemberInit.isInvalid()) 10634 continue; 10635 10636 Member = 10637 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10638 SourceLocation(), 10639 MemberInit.takeAs<Expr>(), 10640 SourceLocation()); 10641 AllToInit.push_back(Member); 10642 10643 // Be sure that the destructor is accessible and is marked as referenced. 10644 if (const RecordType *RecordTy 10645 = Context.getBaseElementType(Field->getType()) 10646 ->getAs<RecordType>()) { 10647 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10648 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10649 MarkFunctionReferenced(Field->getLocation(), Destructor); 10650 CheckDestructorAccess(Field->getLocation(), Destructor, 10651 PDiag(diag::err_access_dtor_ivar) 10652 << Context.getBaseElementType(Field->getType())); 10653 } 10654 } 10655 } 10656 ObjCImplementation->setIvarInitializers(Context, 10657 AllToInit.data(), AllToInit.size()); 10658 } 10659} 10660 10661static 10662void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10663 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10664 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10665 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10666 Sema &S) { 10667 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10668 CE = Current.end(); 10669 if (Ctor->isInvalidDecl()) 10670 return; 10671 10672 const FunctionDecl *FNTarget = 0; 10673 CXXConstructorDecl *Target; 10674 10675 // We ignore the result here since if we don't have a body, Target will be 10676 // null below. 10677 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10678 Target 10679= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10680 10681 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10682 // Avoid dereferencing a null pointer here. 10683 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10684 10685 if (!Current.insert(Canonical)) 10686 return; 10687 10688 // We know that beyond here, we aren't chaining into a cycle. 10689 if (!Target || !Target->isDelegatingConstructor() || 10690 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10691 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10692 Valid.insert(*CI); 10693 Current.clear(); 10694 // We've hit a cycle. 10695 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10696 Current.count(TCanonical)) { 10697 // If we haven't diagnosed this cycle yet, do so now. 10698 if (!Invalid.count(TCanonical)) { 10699 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10700 diag::warn_delegating_ctor_cycle) 10701 << Ctor; 10702 10703 // Don't add a note for a function delegating directo to itself. 10704 if (TCanonical != Canonical) 10705 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10706 10707 CXXConstructorDecl *C = Target; 10708 while (C->getCanonicalDecl() != Canonical) { 10709 (void)C->getTargetConstructor()->hasBody(FNTarget); 10710 assert(FNTarget && "Ctor cycle through bodiless function"); 10711 10712 C 10713 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10714 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10715 } 10716 } 10717 10718 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10719 Invalid.insert(*CI); 10720 Current.clear(); 10721 } else { 10722 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10723 } 10724} 10725 10726 10727void Sema::CheckDelegatingCtorCycles() { 10728 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10729 10730 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10731 CE = Current.end(); 10732 10733 for (DelegatingCtorDeclsType::iterator 10734 I = DelegatingCtorDecls.begin(ExternalSource), 10735 E = DelegatingCtorDecls.end(); 10736 I != E; ++I) { 10737 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10738 } 10739 10740 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10741 (*CI)->setInvalidDecl(); 10742} 10743 10744/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10745Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10746 // Implicitly declared functions (e.g. copy constructors) are 10747 // __host__ __device__ 10748 if (D->isImplicit()) 10749 return CFT_HostDevice; 10750 10751 if (D->hasAttr<CUDAGlobalAttr>()) 10752 return CFT_Global; 10753 10754 if (D->hasAttr<CUDADeviceAttr>()) { 10755 if (D->hasAttr<CUDAHostAttr>()) 10756 return CFT_HostDevice; 10757 else 10758 return CFT_Device; 10759 } 10760 10761 return CFT_Host; 10762} 10763 10764bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10765 CUDAFunctionTarget CalleeTarget) { 10766 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10767 // Callable from the device only." 10768 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10769 return true; 10770 10771 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10772 // Callable from the host only." 10773 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10774 // Callable from the host only." 10775 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10776 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 10777 return true; 10778 10779 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 10780 return true; 10781 10782 return false; 10783} 10784