SemaDeclCXX.cpp revision ac1303eca6cbe3e623fb5ec6fe7ec184ef4b0dfa
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++11 [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. 522 if (New->isConstexpr() != Old->isConstexpr()) { 523 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 524 << New << New->isConstexpr(); 525 Diag(Old->getLocation(), diag::note_previous_declaration); 526 Invalid = true; 527 } 528 529 if (CheckEquivalentExceptionSpec(Old, New)) 530 Invalid = true; 531 532 return Invalid; 533} 534 535/// \brief Merge the exception specifications of two variable declarations. 536/// 537/// This is called when there's a redeclaration of a VarDecl. The function 538/// checks if the redeclaration might have an exception specification and 539/// validates compatibility and merges the specs if necessary. 540void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 541 // Shortcut if exceptions are disabled. 542 if (!getLangOptions().CXXExceptions) 543 return; 544 545 assert(Context.hasSameType(New->getType(), Old->getType()) && 546 "Should only be called if types are otherwise the same."); 547 548 QualType NewType = New->getType(); 549 QualType OldType = Old->getType(); 550 551 // We're only interested in pointers and references to functions, as well 552 // as pointers to member functions. 553 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 554 NewType = R->getPointeeType(); 555 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 556 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 557 NewType = P->getPointeeType(); 558 OldType = OldType->getAs<PointerType>()->getPointeeType(); 559 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 560 NewType = M->getPointeeType(); 561 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 562 } 563 564 if (!NewType->isFunctionProtoType()) 565 return; 566 567 // There's lots of special cases for functions. For function pointers, system 568 // libraries are hopefully not as broken so that we don't need these 569 // workarounds. 570 if (CheckEquivalentExceptionSpec( 571 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 572 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 573 New->setInvalidDecl(); 574 } 575} 576 577/// CheckCXXDefaultArguments - Verify that the default arguments for a 578/// function declaration are well-formed according to C++ 579/// [dcl.fct.default]. 580void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 581 unsigned NumParams = FD->getNumParams(); 582 unsigned p; 583 584 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 585 isa<CXXMethodDecl>(FD) && 586 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 587 588 // Find first parameter with a default argument 589 for (p = 0; p < NumParams; ++p) { 590 ParmVarDecl *Param = FD->getParamDecl(p); 591 if (Param->hasDefaultArg()) { 592 // C++11 [expr.prim.lambda]p5: 593 // [...] Default arguments (8.3.6) shall not be specified in the 594 // parameter-declaration-clause of a lambda-declarator. 595 // 596 // FIXME: Core issue 974 strikes this sentence, we only provide an 597 // extension warning. 598 if (IsLambda) 599 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 600 << Param->getDefaultArgRange(); 601 break; 602 } 603 } 604 605 // C++ [dcl.fct.default]p4: 606 // In a given function declaration, all parameters 607 // subsequent to a parameter with a default argument shall 608 // have default arguments supplied in this or previous 609 // declarations. A default argument shall not be redefined 610 // by a later declaration (not even to the same value). 611 unsigned LastMissingDefaultArg = 0; 612 for (; p < NumParams; ++p) { 613 ParmVarDecl *Param = FD->getParamDecl(p); 614 if (!Param->hasDefaultArg()) { 615 if (Param->isInvalidDecl()) 616 /* We already complained about this parameter. */; 617 else if (Param->getIdentifier()) 618 Diag(Param->getLocation(), 619 diag::err_param_default_argument_missing_name) 620 << Param->getIdentifier(); 621 else 622 Diag(Param->getLocation(), 623 diag::err_param_default_argument_missing); 624 625 LastMissingDefaultArg = p; 626 } 627 } 628 629 if (LastMissingDefaultArg > 0) { 630 // Some default arguments were missing. Clear out all of the 631 // default arguments up to (and including) the last missing 632 // default argument, so that we leave the function parameters 633 // in a semantically valid state. 634 for (p = 0; p <= LastMissingDefaultArg; ++p) { 635 ParmVarDecl *Param = FD->getParamDecl(p); 636 if (Param->hasDefaultArg()) { 637 Param->setDefaultArg(0); 638 } 639 } 640 } 641} 642 643// CheckConstexprParameterTypes - Check whether a function's parameter types 644// are all literal types. If so, return true. If not, produce a suitable 645// diagnostic and return false. 646static bool CheckConstexprParameterTypes(Sema &SemaRef, 647 const FunctionDecl *FD) { 648 unsigned ArgIndex = 0; 649 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 650 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 651 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 652 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 653 SourceLocation ParamLoc = PD->getLocation(); 654 if (!(*i)->isDependentType() && 655 SemaRef.RequireLiteralType(ParamLoc, *i, 656 SemaRef.PDiag(diag::err_constexpr_non_literal_param) 657 << ArgIndex+1 << PD->getSourceRange() 658 << isa<CXXConstructorDecl>(FD))) 659 return false; 660 } 661 return true; 662} 663 664// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 665// the requirements of a constexpr function definition or a constexpr 666// constructor definition. If so, return true. If not, produce appropriate 667// diagnostics and return false. 668// 669// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 670bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 671 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 672 if (MD && MD->isInstance()) { 673 // C++11 [dcl.constexpr]p4: 674 // The definition of a constexpr constructor shall satisfy the following 675 // constraints: 676 // - the class shall not have any virtual base classes; 677 const CXXRecordDecl *RD = MD->getParent(); 678 if (RD->getNumVBases()) { 679 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 680 << isa<CXXConstructorDecl>(NewFD) << RD->isStruct() 681 << RD->getNumVBases(); 682 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 683 E = RD->vbases_end(); I != E; ++I) 684 Diag(I->getSourceRange().getBegin(), 685 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 686 return false; 687 } 688 } 689 690 if (!isa<CXXConstructorDecl>(NewFD)) { 691 // C++11 [dcl.constexpr]p3: 692 // The definition of a constexpr function shall satisfy the following 693 // constraints: 694 // - it shall not be virtual; 695 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 696 if (Method && Method->isVirtual()) { 697 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 698 699 // If it's not obvious why this function is virtual, find an overridden 700 // function which uses the 'virtual' keyword. 701 const CXXMethodDecl *WrittenVirtual = Method; 702 while (!WrittenVirtual->isVirtualAsWritten()) 703 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 704 if (WrittenVirtual != Method) 705 Diag(WrittenVirtual->getLocation(), 706 diag::note_overridden_virtual_function); 707 return false; 708 } 709 710 // - its return type shall be a literal type; 711 QualType RT = NewFD->getResultType(); 712 if (!RT->isDependentType() && 713 RequireLiteralType(NewFD->getLocation(), RT, 714 PDiag(diag::err_constexpr_non_literal_return))) 715 return false; 716 } 717 718 // - each of its parameter types shall be a literal type; 719 if (!CheckConstexprParameterTypes(*this, NewFD)) 720 return false; 721 722 return true; 723} 724 725/// Check the given declaration statement is legal within a constexpr function 726/// body. C++0x [dcl.constexpr]p3,p4. 727/// 728/// \return true if the body is OK, false if we have diagnosed a problem. 729static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 730 DeclStmt *DS) { 731 // C++0x [dcl.constexpr]p3 and p4: 732 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 733 // contain only 734 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 735 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 736 switch ((*DclIt)->getKind()) { 737 case Decl::StaticAssert: 738 case Decl::Using: 739 case Decl::UsingShadow: 740 case Decl::UsingDirective: 741 case Decl::UnresolvedUsingTypename: 742 // - static_assert-declarations 743 // - using-declarations, 744 // - using-directives, 745 continue; 746 747 case Decl::Typedef: 748 case Decl::TypeAlias: { 749 // - typedef declarations and alias-declarations that do not define 750 // classes or enumerations, 751 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 752 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 753 // Don't allow variably-modified types in constexpr functions. 754 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 755 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 756 << TL.getSourceRange() << TL.getType() 757 << isa<CXXConstructorDecl>(Dcl); 758 return false; 759 } 760 continue; 761 } 762 763 case Decl::Enum: 764 case Decl::CXXRecord: 765 // As an extension, we allow the declaration (but not the definition) of 766 // classes and enumerations in all declarations, not just in typedef and 767 // alias declarations. 768 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 769 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 770 << isa<CXXConstructorDecl>(Dcl); 771 return false; 772 } 773 continue; 774 775 case Decl::Var: 776 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 777 << isa<CXXConstructorDecl>(Dcl); 778 return false; 779 780 default: 781 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 782 << isa<CXXConstructorDecl>(Dcl); 783 return false; 784 } 785 } 786 787 return true; 788} 789 790/// Check that the given field is initialized within a constexpr constructor. 791/// 792/// \param Dcl The constexpr constructor being checked. 793/// \param Field The field being checked. This may be a member of an anonymous 794/// struct or union nested within the class being checked. 795/// \param Inits All declarations, including anonymous struct/union members and 796/// indirect members, for which any initialization was provided. 797/// \param Diagnosed Set to true if an error is produced. 798static void CheckConstexprCtorInitializer(Sema &SemaRef, 799 const FunctionDecl *Dcl, 800 FieldDecl *Field, 801 llvm::SmallSet<Decl*, 16> &Inits, 802 bool &Diagnosed) { 803 if (Field->isUnnamedBitfield()) 804 return; 805 806 if (Field->isAnonymousStructOrUnion() && 807 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 808 return; 809 810 if (!Inits.count(Field)) { 811 if (!Diagnosed) { 812 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 813 Diagnosed = true; 814 } 815 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 816 } else if (Field->isAnonymousStructOrUnion()) { 817 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 818 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 819 I != E; ++I) 820 // If an anonymous union contains an anonymous struct of which any member 821 // is initialized, all members must be initialized. 822 if (!RD->isUnion() || Inits.count(*I)) 823 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 824 } 825} 826 827/// Check the body for the given constexpr function declaration only contains 828/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 829/// 830/// \return true if the body is OK, false if we have diagnosed a problem. 831bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 832 if (isa<CXXTryStmt>(Body)) { 833 // C++11 [dcl.constexpr]p3: 834 // The definition of a constexpr function shall satisfy the following 835 // constraints: [...] 836 // - its function-body shall be = delete, = default, or a 837 // compound-statement 838 // 839 // C++11 [dcl.constexpr]p4: 840 // In the definition of a constexpr constructor, [...] 841 // - its function-body shall not be a function-try-block; 842 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 843 << isa<CXXConstructorDecl>(Dcl); 844 return false; 845 } 846 847 // - its function-body shall be [...] a compound-statement that contains only 848 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 849 850 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 851 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 852 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 853 switch ((*BodyIt)->getStmtClass()) { 854 case Stmt::NullStmtClass: 855 // - null statements, 856 continue; 857 858 case Stmt::DeclStmtClass: 859 // - static_assert-declarations 860 // - using-declarations, 861 // - using-directives, 862 // - typedef declarations and alias-declarations that do not define 863 // classes or enumerations, 864 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 865 return false; 866 continue; 867 868 case Stmt::ReturnStmtClass: 869 // - and exactly one return statement; 870 if (isa<CXXConstructorDecl>(Dcl)) 871 break; 872 873 ReturnStmts.push_back((*BodyIt)->getLocStart()); 874 continue; 875 876 default: 877 break; 878 } 879 880 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 881 << isa<CXXConstructorDecl>(Dcl); 882 return false; 883 } 884 885 if (const CXXConstructorDecl *Constructor 886 = dyn_cast<CXXConstructorDecl>(Dcl)) { 887 const CXXRecordDecl *RD = Constructor->getParent(); 888 // DR1359: 889 // - every non-variant non-static data member and base class sub-object 890 // shall be initialized; 891 // - if the class is a non-empty union, or for each non-empty anonymous 892 // union member of a non-union class, exactly one non-static data member 893 // shall be initialized; 894 if (RD->isUnion()) { 895 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 896 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 897 return false; 898 } 899 } else if (!Constructor->isDependentContext() && 900 !Constructor->isDelegatingConstructor()) { 901 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 902 903 // Skip detailed checking if we have enough initializers, and we would 904 // allow at most one initializer per member. 905 bool AnyAnonStructUnionMembers = false; 906 unsigned Fields = 0; 907 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 908 E = RD->field_end(); I != E; ++I, ++Fields) { 909 if ((*I)->isAnonymousStructOrUnion()) { 910 AnyAnonStructUnionMembers = true; 911 break; 912 } 913 } 914 if (AnyAnonStructUnionMembers || 915 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 916 // Check initialization of non-static data members. Base classes are 917 // always initialized so do not need to be checked. Dependent bases 918 // might not have initializers in the member initializer list. 919 llvm::SmallSet<Decl*, 16> Inits; 920 for (CXXConstructorDecl::init_const_iterator 921 I = Constructor->init_begin(), E = Constructor->init_end(); 922 I != E; ++I) { 923 if (FieldDecl *FD = (*I)->getMember()) 924 Inits.insert(FD); 925 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 926 Inits.insert(ID->chain_begin(), ID->chain_end()); 927 } 928 929 bool Diagnosed = false; 930 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 931 E = RD->field_end(); I != E; ++I) 932 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 933 if (Diagnosed) 934 return false; 935 } 936 } 937 } else { 938 if (ReturnStmts.empty()) { 939 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 940 return false; 941 } 942 if (ReturnStmts.size() > 1) { 943 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 944 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 945 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 946 return false; 947 } 948 } 949 950 // C++11 [dcl.constexpr]p5: 951 // if no function argument values exist such that the function invocation 952 // substitution would produce a constant expression, the program is 953 // ill-formed; no diagnostic required. 954 // C++11 [dcl.constexpr]p3: 955 // - every constructor call and implicit conversion used in initializing the 956 // return value shall be one of those allowed in a constant expression. 957 // C++11 [dcl.constexpr]p4: 958 // - every constructor involved in initializing non-static data members and 959 // base class sub-objects shall be a constexpr constructor. 960 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 961 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 962 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 963 << isa<CXXConstructorDecl>(Dcl); 964 for (size_t I = 0, N = Diags.size(); I != N; ++I) 965 Diag(Diags[I].first, Diags[I].second); 966 return false; 967 } 968 969 return true; 970} 971 972/// isCurrentClassName - Determine whether the identifier II is the 973/// name of the class type currently being defined. In the case of 974/// nested classes, this will only return true if II is the name of 975/// the innermost class. 976bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 977 const CXXScopeSpec *SS) { 978 assert(getLangOptions().CPlusPlus && "No class names in C!"); 979 980 CXXRecordDecl *CurDecl; 981 if (SS && SS->isSet() && !SS->isInvalid()) { 982 DeclContext *DC = computeDeclContext(*SS, true); 983 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 984 } else 985 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 986 987 if (CurDecl && CurDecl->getIdentifier()) 988 return &II == CurDecl->getIdentifier(); 989 else 990 return false; 991} 992 993/// \brief Check the validity of a C++ base class specifier. 994/// 995/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 996/// and returns NULL otherwise. 997CXXBaseSpecifier * 998Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 999 SourceRange SpecifierRange, 1000 bool Virtual, AccessSpecifier Access, 1001 TypeSourceInfo *TInfo, 1002 SourceLocation EllipsisLoc) { 1003 QualType BaseType = TInfo->getType(); 1004 1005 // C++ [class.union]p1: 1006 // A union shall not have base classes. 1007 if (Class->isUnion()) { 1008 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1009 << SpecifierRange; 1010 return 0; 1011 } 1012 1013 if (EllipsisLoc.isValid() && 1014 !TInfo->getType()->containsUnexpandedParameterPack()) { 1015 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1016 << TInfo->getTypeLoc().getSourceRange(); 1017 EllipsisLoc = SourceLocation(); 1018 } 1019 1020 if (BaseType->isDependentType()) 1021 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1022 Class->getTagKind() == TTK_Class, 1023 Access, TInfo, EllipsisLoc); 1024 1025 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1026 1027 // Base specifiers must be record types. 1028 if (!BaseType->isRecordType()) { 1029 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1030 return 0; 1031 } 1032 1033 // C++ [class.union]p1: 1034 // A union shall not be used as a base class. 1035 if (BaseType->isUnionType()) { 1036 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1037 return 0; 1038 } 1039 1040 // C++ [class.derived]p2: 1041 // The class-name in a base-specifier shall not be an incompletely 1042 // defined class. 1043 if (RequireCompleteType(BaseLoc, BaseType, 1044 PDiag(diag::err_incomplete_base_class) 1045 << SpecifierRange)) { 1046 Class->setInvalidDecl(); 1047 return 0; 1048 } 1049 1050 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1051 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1052 assert(BaseDecl && "Record type has no declaration"); 1053 BaseDecl = BaseDecl->getDefinition(); 1054 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1055 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1056 assert(CXXBaseDecl && "Base type is not a C++ type"); 1057 1058 // C++ [class]p3: 1059 // If a class is marked final and it appears as a base-type-specifier in 1060 // base-clause, the program is ill-formed. 1061 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1062 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1063 << CXXBaseDecl->getDeclName(); 1064 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1065 << CXXBaseDecl->getDeclName(); 1066 return 0; 1067 } 1068 1069 if (BaseDecl->isInvalidDecl()) 1070 Class->setInvalidDecl(); 1071 1072 // Create the base specifier. 1073 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1074 Class->getTagKind() == TTK_Class, 1075 Access, TInfo, EllipsisLoc); 1076} 1077 1078/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1079/// one entry in the base class list of a class specifier, for 1080/// example: 1081/// class foo : public bar, virtual private baz { 1082/// 'public bar' and 'virtual private baz' are each base-specifiers. 1083BaseResult 1084Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1085 bool Virtual, AccessSpecifier Access, 1086 ParsedType basetype, SourceLocation BaseLoc, 1087 SourceLocation EllipsisLoc) { 1088 if (!classdecl) 1089 return true; 1090 1091 AdjustDeclIfTemplate(classdecl); 1092 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1093 if (!Class) 1094 return true; 1095 1096 TypeSourceInfo *TInfo = 0; 1097 GetTypeFromParser(basetype, &TInfo); 1098 1099 if (EllipsisLoc.isInvalid() && 1100 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1101 UPPC_BaseType)) 1102 return true; 1103 1104 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1105 Virtual, Access, TInfo, 1106 EllipsisLoc)) 1107 return BaseSpec; 1108 1109 return true; 1110} 1111 1112/// \brief Performs the actual work of attaching the given base class 1113/// specifiers to a C++ class. 1114bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1115 unsigned NumBases) { 1116 if (NumBases == 0) 1117 return false; 1118 1119 // Used to keep track of which base types we have already seen, so 1120 // that we can properly diagnose redundant direct base types. Note 1121 // that the key is always the unqualified canonical type of the base 1122 // class. 1123 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1124 1125 // Copy non-redundant base specifiers into permanent storage. 1126 unsigned NumGoodBases = 0; 1127 bool Invalid = false; 1128 for (unsigned idx = 0; idx < NumBases; ++idx) { 1129 QualType NewBaseType 1130 = Context.getCanonicalType(Bases[idx]->getType()); 1131 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1132 if (KnownBaseTypes[NewBaseType]) { 1133 // C++ [class.mi]p3: 1134 // A class shall not be specified as a direct base class of a 1135 // derived class more than once. 1136 Diag(Bases[idx]->getSourceRange().getBegin(), 1137 diag::err_duplicate_base_class) 1138 << KnownBaseTypes[NewBaseType]->getType() 1139 << Bases[idx]->getSourceRange(); 1140 1141 // Delete the duplicate base class specifier; we're going to 1142 // overwrite its pointer later. 1143 Context.Deallocate(Bases[idx]); 1144 1145 Invalid = true; 1146 } else { 1147 // Okay, add this new base class. 1148 KnownBaseTypes[NewBaseType] = Bases[idx]; 1149 Bases[NumGoodBases++] = Bases[idx]; 1150 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1151 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1152 if (RD->hasAttr<WeakAttr>()) 1153 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1154 } 1155 } 1156 1157 // Attach the remaining base class specifiers to the derived class. 1158 Class->setBases(Bases, NumGoodBases); 1159 1160 // Delete the remaining (good) base class specifiers, since their 1161 // data has been copied into the CXXRecordDecl. 1162 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1163 Context.Deallocate(Bases[idx]); 1164 1165 return Invalid; 1166} 1167 1168/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1169/// class, after checking whether there are any duplicate base 1170/// classes. 1171void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1172 unsigned NumBases) { 1173 if (!ClassDecl || !Bases || !NumBases) 1174 return; 1175 1176 AdjustDeclIfTemplate(ClassDecl); 1177 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1178 (CXXBaseSpecifier**)(Bases), NumBases); 1179} 1180 1181static CXXRecordDecl *GetClassForType(QualType T) { 1182 if (const RecordType *RT = T->getAs<RecordType>()) 1183 return cast<CXXRecordDecl>(RT->getDecl()); 1184 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1185 return ICT->getDecl(); 1186 else 1187 return 0; 1188} 1189 1190/// \brief Determine whether the type \p Derived is a C++ class that is 1191/// derived from the type \p Base. 1192bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1193 if (!getLangOptions().CPlusPlus) 1194 return false; 1195 1196 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1197 if (!DerivedRD) 1198 return false; 1199 1200 CXXRecordDecl *BaseRD = GetClassForType(Base); 1201 if (!BaseRD) 1202 return false; 1203 1204 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1205 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1206} 1207 1208/// \brief Determine whether the type \p Derived is a C++ class that is 1209/// derived from the type \p Base. 1210bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1211 if (!getLangOptions().CPlusPlus) 1212 return false; 1213 1214 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1215 if (!DerivedRD) 1216 return false; 1217 1218 CXXRecordDecl *BaseRD = GetClassForType(Base); 1219 if (!BaseRD) 1220 return false; 1221 1222 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1223} 1224 1225void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1226 CXXCastPath &BasePathArray) { 1227 assert(BasePathArray.empty() && "Base path array must be empty!"); 1228 assert(Paths.isRecordingPaths() && "Must record paths!"); 1229 1230 const CXXBasePath &Path = Paths.front(); 1231 1232 // We first go backward and check if we have a virtual base. 1233 // FIXME: It would be better if CXXBasePath had the base specifier for 1234 // the nearest virtual base. 1235 unsigned Start = 0; 1236 for (unsigned I = Path.size(); I != 0; --I) { 1237 if (Path[I - 1].Base->isVirtual()) { 1238 Start = I - 1; 1239 break; 1240 } 1241 } 1242 1243 // Now add all bases. 1244 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1245 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1246} 1247 1248/// \brief Determine whether the given base path includes a virtual 1249/// base class. 1250bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1251 for (CXXCastPath::const_iterator B = BasePath.begin(), 1252 BEnd = BasePath.end(); 1253 B != BEnd; ++B) 1254 if ((*B)->isVirtual()) 1255 return true; 1256 1257 return false; 1258} 1259 1260/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1261/// conversion (where Derived and Base are class types) is 1262/// well-formed, meaning that the conversion is unambiguous (and 1263/// that all of the base classes are accessible). Returns true 1264/// and emits a diagnostic if the code is ill-formed, returns false 1265/// otherwise. Loc is the location where this routine should point to 1266/// if there is an error, and Range is the source range to highlight 1267/// if there is an error. 1268bool 1269Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1270 unsigned InaccessibleBaseID, 1271 unsigned AmbigiousBaseConvID, 1272 SourceLocation Loc, SourceRange Range, 1273 DeclarationName Name, 1274 CXXCastPath *BasePath) { 1275 // First, determine whether the path from Derived to Base is 1276 // ambiguous. This is slightly more expensive than checking whether 1277 // the Derived to Base conversion exists, because here we need to 1278 // explore multiple paths to determine if there is an ambiguity. 1279 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1280 /*DetectVirtual=*/false); 1281 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1282 assert(DerivationOkay && 1283 "Can only be used with a derived-to-base conversion"); 1284 (void)DerivationOkay; 1285 1286 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1287 if (InaccessibleBaseID) { 1288 // Check that the base class can be accessed. 1289 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1290 InaccessibleBaseID)) { 1291 case AR_inaccessible: 1292 return true; 1293 case AR_accessible: 1294 case AR_dependent: 1295 case AR_delayed: 1296 break; 1297 } 1298 } 1299 1300 // Build a base path if necessary. 1301 if (BasePath) 1302 BuildBasePathArray(Paths, *BasePath); 1303 return false; 1304 } 1305 1306 // We know that the derived-to-base conversion is ambiguous, and 1307 // we're going to produce a diagnostic. Perform the derived-to-base 1308 // search just one more time to compute all of the possible paths so 1309 // that we can print them out. This is more expensive than any of 1310 // the previous derived-to-base checks we've done, but at this point 1311 // performance isn't as much of an issue. 1312 Paths.clear(); 1313 Paths.setRecordingPaths(true); 1314 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1315 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1316 (void)StillOkay; 1317 1318 // Build up a textual representation of the ambiguous paths, e.g., 1319 // D -> B -> A, that will be used to illustrate the ambiguous 1320 // conversions in the diagnostic. We only print one of the paths 1321 // to each base class subobject. 1322 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1323 1324 Diag(Loc, AmbigiousBaseConvID) 1325 << Derived << Base << PathDisplayStr << Range << Name; 1326 return true; 1327} 1328 1329bool 1330Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1331 SourceLocation Loc, SourceRange Range, 1332 CXXCastPath *BasePath, 1333 bool IgnoreAccess) { 1334 return CheckDerivedToBaseConversion(Derived, Base, 1335 IgnoreAccess ? 0 1336 : diag::err_upcast_to_inaccessible_base, 1337 diag::err_ambiguous_derived_to_base_conv, 1338 Loc, Range, DeclarationName(), 1339 BasePath); 1340} 1341 1342 1343/// @brief Builds a string representing ambiguous paths from a 1344/// specific derived class to different subobjects of the same base 1345/// class. 1346/// 1347/// This function builds a string that can be used in error messages 1348/// to show the different paths that one can take through the 1349/// inheritance hierarchy to go from the derived class to different 1350/// subobjects of a base class. The result looks something like this: 1351/// @code 1352/// struct D -> struct B -> struct A 1353/// struct D -> struct C -> struct A 1354/// @endcode 1355std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1356 std::string PathDisplayStr; 1357 std::set<unsigned> DisplayedPaths; 1358 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1359 Path != Paths.end(); ++Path) { 1360 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1361 // We haven't displayed a path to this particular base 1362 // class subobject yet. 1363 PathDisplayStr += "\n "; 1364 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1365 for (CXXBasePath::const_iterator Element = Path->begin(); 1366 Element != Path->end(); ++Element) 1367 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1368 } 1369 } 1370 1371 return PathDisplayStr; 1372} 1373 1374//===----------------------------------------------------------------------===// 1375// C++ class member Handling 1376//===----------------------------------------------------------------------===// 1377 1378/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1379bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1380 SourceLocation ASLoc, 1381 SourceLocation ColonLoc, 1382 AttributeList *Attrs) { 1383 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1384 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1385 ASLoc, ColonLoc); 1386 CurContext->addHiddenDecl(ASDecl); 1387 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1388} 1389 1390/// CheckOverrideControl - Check C++0x override control semantics. 1391void Sema::CheckOverrideControl(const Decl *D) { 1392 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1393 if (!MD || !MD->isVirtual()) 1394 return; 1395 1396 if (MD->isDependentContext()) 1397 return; 1398 1399 // C++0x [class.virtual]p3: 1400 // If a virtual function is marked with the virt-specifier override and does 1401 // not override a member function of a base class, 1402 // the program is ill-formed. 1403 bool HasOverriddenMethods = 1404 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1405 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1406 Diag(MD->getLocation(), 1407 diag::err_function_marked_override_not_overriding) 1408 << MD->getDeclName(); 1409 return; 1410 } 1411} 1412 1413/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1414/// function overrides a virtual member function marked 'final', according to 1415/// C++0x [class.virtual]p3. 1416bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1417 const CXXMethodDecl *Old) { 1418 if (!Old->hasAttr<FinalAttr>()) 1419 return false; 1420 1421 Diag(New->getLocation(), diag::err_final_function_overridden) 1422 << New->getDeclName(); 1423 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1424 return true; 1425} 1426 1427/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1428/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1429/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1430/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1431/// present but parsing it has been deferred. 1432Decl * 1433Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1434 MultiTemplateParamsArg TemplateParameterLists, 1435 Expr *BW, const VirtSpecifiers &VS, 1436 bool HasDeferredInit) { 1437 const DeclSpec &DS = D.getDeclSpec(); 1438 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1439 DeclarationName Name = NameInfo.getName(); 1440 SourceLocation Loc = NameInfo.getLoc(); 1441 1442 // For anonymous bitfields, the location should point to the type. 1443 if (Loc.isInvalid()) 1444 Loc = D.getSourceRange().getBegin(); 1445 1446 Expr *BitWidth = static_cast<Expr*>(BW); 1447 1448 assert(isa<CXXRecordDecl>(CurContext)); 1449 assert(!DS.isFriendSpecified()); 1450 1451 bool isFunc = D.isDeclarationOfFunction(); 1452 1453 // C++ 9.2p6: A member shall not be declared to have automatic storage 1454 // duration (auto, register) or with the extern storage-class-specifier. 1455 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1456 // data members and cannot be applied to names declared const or static, 1457 // and cannot be applied to reference members. 1458 switch (DS.getStorageClassSpec()) { 1459 case DeclSpec::SCS_unspecified: 1460 case DeclSpec::SCS_typedef: 1461 case DeclSpec::SCS_static: 1462 // FALL THROUGH. 1463 break; 1464 case DeclSpec::SCS_mutable: 1465 if (isFunc) { 1466 if (DS.getStorageClassSpecLoc().isValid()) 1467 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1468 else 1469 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1470 1471 // FIXME: It would be nicer if the keyword was ignored only for this 1472 // declarator. Otherwise we could get follow-up errors. 1473 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1474 } 1475 break; 1476 default: 1477 if (DS.getStorageClassSpecLoc().isValid()) 1478 Diag(DS.getStorageClassSpecLoc(), 1479 diag::err_storageclass_invalid_for_member); 1480 else 1481 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1482 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1483 } 1484 1485 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1486 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1487 !isFunc); 1488 1489 Decl *Member; 1490 if (isInstField) { 1491 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1492 1493 // Data members must have identifiers for names. 1494 if (Name.getNameKind() != DeclarationName::Identifier) { 1495 Diag(Loc, diag::err_bad_variable_name) 1496 << Name; 1497 return 0; 1498 } 1499 1500 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1501 1502 // Member field could not be with "template" keyword. 1503 // So TemplateParameterLists should be empty in this case. 1504 if (TemplateParameterLists.size()) { 1505 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1506 if (TemplateParams->size()) { 1507 // There is no such thing as a member field template. 1508 Diag(D.getIdentifierLoc(), diag::err_template_member) 1509 << II 1510 << SourceRange(TemplateParams->getTemplateLoc(), 1511 TemplateParams->getRAngleLoc()); 1512 } else { 1513 // There is an extraneous 'template<>' for this member. 1514 Diag(TemplateParams->getTemplateLoc(), 1515 diag::err_template_member_noparams) 1516 << II 1517 << SourceRange(TemplateParams->getTemplateLoc(), 1518 TemplateParams->getRAngleLoc()); 1519 } 1520 return 0; 1521 } 1522 1523 if (SS.isSet() && !SS.isInvalid()) { 1524 // The user provided a superfluous scope specifier inside a class 1525 // definition: 1526 // 1527 // class X { 1528 // int X::member; 1529 // }; 1530 DeclContext *DC = 0; 1531 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1532 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1533 << Name << FixItHint::CreateRemoval(SS.getRange()); 1534 else 1535 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1536 << Name << SS.getRange(); 1537 1538 SS.clear(); 1539 } 1540 1541 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1542 HasDeferredInit, AS); 1543 assert(Member && "HandleField never returns null"); 1544 } else { 1545 assert(!HasDeferredInit); 1546 1547 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1548 if (!Member) { 1549 return 0; 1550 } 1551 1552 // Non-instance-fields can't have a bitfield. 1553 if (BitWidth) { 1554 if (Member->isInvalidDecl()) { 1555 // don't emit another diagnostic. 1556 } else if (isa<VarDecl>(Member)) { 1557 // C++ 9.6p3: A bit-field shall not be a static member. 1558 // "static member 'A' cannot be a bit-field" 1559 Diag(Loc, diag::err_static_not_bitfield) 1560 << Name << BitWidth->getSourceRange(); 1561 } else if (isa<TypedefDecl>(Member)) { 1562 // "typedef member 'x' cannot be a bit-field" 1563 Diag(Loc, diag::err_typedef_not_bitfield) 1564 << Name << BitWidth->getSourceRange(); 1565 } else { 1566 // A function typedef ("typedef int f(); f a;"). 1567 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1568 Diag(Loc, diag::err_not_integral_type_bitfield) 1569 << Name << cast<ValueDecl>(Member)->getType() 1570 << BitWidth->getSourceRange(); 1571 } 1572 1573 BitWidth = 0; 1574 Member->setInvalidDecl(); 1575 } 1576 1577 Member->setAccess(AS); 1578 1579 // If we have declared a member function template, set the access of the 1580 // templated declaration as well. 1581 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1582 FunTmpl->getTemplatedDecl()->setAccess(AS); 1583 } 1584 1585 if (VS.isOverrideSpecified()) { 1586 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1587 if (!MD || !MD->isVirtual()) { 1588 Diag(Member->getLocStart(), 1589 diag::override_keyword_only_allowed_on_virtual_member_functions) 1590 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1591 } else 1592 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1593 } 1594 if (VS.isFinalSpecified()) { 1595 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1596 if (!MD || !MD->isVirtual()) { 1597 Diag(Member->getLocStart(), 1598 diag::override_keyword_only_allowed_on_virtual_member_functions) 1599 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1600 } else 1601 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1602 } 1603 1604 if (VS.getLastLocation().isValid()) { 1605 // Update the end location of a method that has a virt-specifiers. 1606 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1607 MD->setRangeEnd(VS.getLastLocation()); 1608 } 1609 1610 CheckOverrideControl(Member); 1611 1612 assert((Name || isInstField) && "No identifier for non-field ?"); 1613 1614 if (isInstField) 1615 FieldCollector->Add(cast<FieldDecl>(Member)); 1616 return Member; 1617} 1618 1619/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1620/// in-class initializer for a non-static C++ class member, and after 1621/// instantiating an in-class initializer in a class template. Such actions 1622/// are deferred until the class is complete. 1623void 1624Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1625 Expr *InitExpr) { 1626 FieldDecl *FD = cast<FieldDecl>(D); 1627 1628 if (!InitExpr) { 1629 FD->setInvalidDecl(); 1630 FD->removeInClassInitializer(); 1631 return; 1632 } 1633 1634 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1635 FD->setInvalidDecl(); 1636 FD->removeInClassInitializer(); 1637 return; 1638 } 1639 1640 ExprResult Init = InitExpr; 1641 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1642 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1643 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1644 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1645 } 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 if (isStdInitializerList(Member->getType(), 0)) { 2117 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2118 << /*at end of ctor*/1 << InitRange; 2119 } 2120 } 2121 2122 // Initialize the member. 2123 InitializedEntity MemberEntity = 2124 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2125 : InitializedEntity::InitializeMember(IndirectMember, 0); 2126 InitializationKind Kind = 2127 InitList ? InitializationKind::CreateDirectList(IdLoc) 2128 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2129 InitRange.getEnd()); 2130 2131 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2132 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2133 MultiExprArg(*this, Args, NumArgs), 2134 0); 2135 if (MemberInit.isInvalid()) 2136 return true; 2137 2138 CheckImplicitConversions(MemberInit.get(), 2139 InitRange.getBegin()); 2140 2141 // C++0x [class.base.init]p7: 2142 // The initialization of each base and member constitutes a 2143 // full-expression. 2144 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2145 if (MemberInit.isInvalid()) 2146 return true; 2147 2148 // If we are in a dependent context, template instantiation will 2149 // perform this type-checking again. Just save the arguments that we 2150 // received. 2151 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2152 // of the information that we have about the member 2153 // initializer. However, deconstructing the ASTs is a dicey process, 2154 // and this approach is far more likely to get the corner cases right. 2155 if (CurContext->isDependentContext()) { 2156 // The existing Init will do fine. 2157 } else { 2158 Init = MemberInit.get(); 2159 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2160 } 2161 } 2162 2163 if (DirectMember) { 2164 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2165 InitRange.getBegin(), Init, 2166 InitRange.getEnd()); 2167 } else { 2168 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2169 InitRange.getBegin(), Init, 2170 InitRange.getEnd()); 2171 } 2172} 2173 2174MemInitResult 2175Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2176 CXXRecordDecl *ClassDecl) { 2177 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2178 if (!LangOpts.CPlusPlus0x) 2179 return Diag(NameLoc, diag::err_delegating_ctor) 2180 << TInfo->getTypeLoc().getLocalSourceRange(); 2181 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2182 2183 bool InitList = true; 2184 Expr **Args = &Init; 2185 unsigned NumArgs = 1; 2186 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2187 InitList = false; 2188 Args = ParenList->getExprs(); 2189 NumArgs = ParenList->getNumExprs(); 2190 } 2191 2192 SourceRange InitRange = Init->getSourceRange(); 2193 // Initialize the object. 2194 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2195 QualType(ClassDecl->getTypeForDecl(), 0)); 2196 InitializationKind Kind = 2197 InitList ? InitializationKind::CreateDirectList(NameLoc) 2198 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2199 InitRange.getEnd()); 2200 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2201 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2202 MultiExprArg(*this, Args,NumArgs), 2203 0); 2204 if (DelegationInit.isInvalid()) 2205 return true; 2206 2207 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2208 "Delegating constructor with no target?"); 2209 2210 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2211 2212 // C++0x [class.base.init]p7: 2213 // The initialization of each base and member constitutes a 2214 // full-expression. 2215 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2216 if (DelegationInit.isInvalid()) 2217 return true; 2218 2219 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2220 DelegationInit.takeAs<Expr>(), 2221 InitRange.getEnd()); 2222} 2223 2224MemInitResult 2225Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2226 Expr *Init, CXXRecordDecl *ClassDecl, 2227 SourceLocation EllipsisLoc) { 2228 SourceLocation BaseLoc 2229 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2230 2231 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2232 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2233 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2234 2235 // C++ [class.base.init]p2: 2236 // [...] Unless the mem-initializer-id names a nonstatic data 2237 // member of the constructor's class or a direct or virtual base 2238 // of that class, the mem-initializer is ill-formed. A 2239 // mem-initializer-list can initialize a base class using any 2240 // name that denotes that base class type. 2241 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2242 2243 SourceRange InitRange = Init->getSourceRange(); 2244 if (EllipsisLoc.isValid()) { 2245 // This is a pack expansion. 2246 if (!BaseType->containsUnexpandedParameterPack()) { 2247 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2248 << SourceRange(BaseLoc, InitRange.getEnd()); 2249 2250 EllipsisLoc = SourceLocation(); 2251 } 2252 } else { 2253 // Check for any unexpanded parameter packs. 2254 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2255 return true; 2256 2257 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2258 return true; 2259 } 2260 2261 // Check for direct and virtual base classes. 2262 const CXXBaseSpecifier *DirectBaseSpec = 0; 2263 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2264 if (!Dependent) { 2265 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2266 BaseType)) 2267 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2268 2269 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2270 VirtualBaseSpec); 2271 2272 // C++ [base.class.init]p2: 2273 // Unless the mem-initializer-id names a nonstatic data member of the 2274 // constructor's class or a direct or virtual base of that class, the 2275 // mem-initializer is ill-formed. 2276 if (!DirectBaseSpec && !VirtualBaseSpec) { 2277 // If the class has any dependent bases, then it's possible that 2278 // one of those types will resolve to the same type as 2279 // BaseType. Therefore, just treat this as a dependent base 2280 // class initialization. FIXME: Should we try to check the 2281 // initialization anyway? It seems odd. 2282 if (ClassDecl->hasAnyDependentBases()) 2283 Dependent = true; 2284 else 2285 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2286 << BaseType << Context.getTypeDeclType(ClassDecl) 2287 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2288 } 2289 } 2290 2291 if (Dependent) { 2292 DiscardCleanupsInEvaluationContext(); 2293 2294 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2295 /*IsVirtual=*/false, 2296 InitRange.getBegin(), Init, 2297 InitRange.getEnd(), EllipsisLoc); 2298 } 2299 2300 // C++ [base.class.init]p2: 2301 // If a mem-initializer-id is ambiguous because it designates both 2302 // a direct non-virtual base class and an inherited virtual base 2303 // class, the mem-initializer is ill-formed. 2304 if (DirectBaseSpec && VirtualBaseSpec) 2305 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2306 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2307 2308 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2309 if (!BaseSpec) 2310 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2311 2312 // Initialize the base. 2313 bool InitList = true; 2314 Expr **Args = &Init; 2315 unsigned NumArgs = 1; 2316 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2317 InitList = false; 2318 Args = ParenList->getExprs(); 2319 NumArgs = ParenList->getNumExprs(); 2320 } 2321 2322 InitializedEntity BaseEntity = 2323 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2324 InitializationKind Kind = 2325 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2326 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2327 InitRange.getEnd()); 2328 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2329 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2330 MultiExprArg(*this, Args, NumArgs), 2331 0); 2332 if (BaseInit.isInvalid()) 2333 return true; 2334 2335 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2336 2337 // C++0x [class.base.init]p7: 2338 // The initialization of each base and member constitutes a 2339 // full-expression. 2340 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2341 if (BaseInit.isInvalid()) 2342 return true; 2343 2344 // If we are in a dependent context, template instantiation will 2345 // perform this type-checking again. Just save the arguments that we 2346 // received in a ParenListExpr. 2347 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2348 // of the information that we have about the base 2349 // initializer. However, deconstructing the ASTs is a dicey process, 2350 // and this approach is far more likely to get the corner cases right. 2351 if (CurContext->isDependentContext()) 2352 BaseInit = Owned(Init); 2353 2354 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2355 BaseSpec->isVirtual(), 2356 InitRange.getBegin(), 2357 BaseInit.takeAs<Expr>(), 2358 InitRange.getEnd(), EllipsisLoc); 2359} 2360 2361// Create a static_cast\<T&&>(expr). 2362static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2363 QualType ExprType = E->getType(); 2364 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2365 SourceLocation ExprLoc = E->getLocStart(); 2366 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2367 TargetType, ExprLoc); 2368 2369 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2370 SourceRange(ExprLoc, ExprLoc), 2371 E->getSourceRange()).take(); 2372} 2373 2374/// ImplicitInitializerKind - How an implicit base or member initializer should 2375/// initialize its base or member. 2376enum ImplicitInitializerKind { 2377 IIK_Default, 2378 IIK_Copy, 2379 IIK_Move 2380}; 2381 2382static bool 2383BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2384 ImplicitInitializerKind ImplicitInitKind, 2385 CXXBaseSpecifier *BaseSpec, 2386 bool IsInheritedVirtualBase, 2387 CXXCtorInitializer *&CXXBaseInit) { 2388 InitializedEntity InitEntity 2389 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2390 IsInheritedVirtualBase); 2391 2392 ExprResult BaseInit; 2393 2394 switch (ImplicitInitKind) { 2395 case IIK_Default: { 2396 InitializationKind InitKind 2397 = InitializationKind::CreateDefault(Constructor->getLocation()); 2398 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2399 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2400 MultiExprArg(SemaRef, 0, 0)); 2401 break; 2402 } 2403 2404 case IIK_Move: 2405 case IIK_Copy: { 2406 bool Moving = ImplicitInitKind == IIK_Move; 2407 ParmVarDecl *Param = Constructor->getParamDecl(0); 2408 QualType ParamType = Param->getType().getNonReferenceType(); 2409 2410 Expr *CopyCtorArg = 2411 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2412 SourceLocation(), Param, 2413 Constructor->getLocation(), ParamType, 2414 VK_LValue, 0); 2415 2416 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2417 2418 // Cast to the base class to avoid ambiguities. 2419 QualType ArgTy = 2420 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2421 ParamType.getQualifiers()); 2422 2423 if (Moving) { 2424 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2425 } 2426 2427 CXXCastPath BasePath; 2428 BasePath.push_back(BaseSpec); 2429 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2430 CK_UncheckedDerivedToBase, 2431 Moving ? VK_XValue : VK_LValue, 2432 &BasePath).take(); 2433 2434 InitializationKind InitKind 2435 = InitializationKind::CreateDirect(Constructor->getLocation(), 2436 SourceLocation(), SourceLocation()); 2437 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2438 &CopyCtorArg, 1); 2439 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2440 MultiExprArg(&CopyCtorArg, 1)); 2441 break; 2442 } 2443 } 2444 2445 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2446 if (BaseInit.isInvalid()) 2447 return true; 2448 2449 CXXBaseInit = 2450 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2451 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2452 SourceLocation()), 2453 BaseSpec->isVirtual(), 2454 SourceLocation(), 2455 BaseInit.takeAs<Expr>(), 2456 SourceLocation(), 2457 SourceLocation()); 2458 2459 return false; 2460} 2461 2462static bool RefersToRValueRef(Expr *MemRef) { 2463 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2464 return Referenced->getType()->isRValueReferenceType(); 2465} 2466 2467static bool 2468BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2469 ImplicitInitializerKind ImplicitInitKind, 2470 FieldDecl *Field, IndirectFieldDecl *Indirect, 2471 CXXCtorInitializer *&CXXMemberInit) { 2472 if (Field->isInvalidDecl()) 2473 return true; 2474 2475 SourceLocation Loc = Constructor->getLocation(); 2476 2477 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2478 bool Moving = ImplicitInitKind == IIK_Move; 2479 ParmVarDecl *Param = Constructor->getParamDecl(0); 2480 QualType ParamType = Param->getType().getNonReferenceType(); 2481 2482 // Suppress copying zero-width bitfields. 2483 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2484 return false; 2485 2486 Expr *MemberExprBase = 2487 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2488 SourceLocation(), Param, 2489 Loc, ParamType, VK_LValue, 0); 2490 2491 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2492 2493 if (Moving) { 2494 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2495 } 2496 2497 // Build a reference to this field within the parameter. 2498 CXXScopeSpec SS; 2499 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2500 Sema::LookupMemberName); 2501 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2502 : cast<ValueDecl>(Field), AS_public); 2503 MemberLookup.resolveKind(); 2504 ExprResult CtorArg 2505 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2506 ParamType, Loc, 2507 /*IsArrow=*/false, 2508 SS, 2509 /*TemplateKWLoc=*/SourceLocation(), 2510 /*FirstQualifierInScope=*/0, 2511 MemberLookup, 2512 /*TemplateArgs=*/0); 2513 if (CtorArg.isInvalid()) 2514 return true; 2515 2516 // C++11 [class.copy]p15: 2517 // - if a member m has rvalue reference type T&&, it is direct-initialized 2518 // with static_cast<T&&>(x.m); 2519 if (RefersToRValueRef(CtorArg.get())) { 2520 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2521 } 2522 2523 // When the field we are copying is an array, create index variables for 2524 // each dimension of the array. We use these index variables to subscript 2525 // the source array, and other clients (e.g., CodeGen) will perform the 2526 // necessary iteration with these index variables. 2527 SmallVector<VarDecl *, 4> IndexVariables; 2528 QualType BaseType = Field->getType(); 2529 QualType SizeType = SemaRef.Context.getSizeType(); 2530 bool InitializingArray = false; 2531 while (const ConstantArrayType *Array 2532 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2533 InitializingArray = true; 2534 // Create the iteration variable for this array index. 2535 IdentifierInfo *IterationVarName = 0; 2536 { 2537 SmallString<8> Str; 2538 llvm::raw_svector_ostream OS(Str); 2539 OS << "__i" << IndexVariables.size(); 2540 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2541 } 2542 VarDecl *IterationVar 2543 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2544 IterationVarName, SizeType, 2545 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2546 SC_None, SC_None); 2547 IndexVariables.push_back(IterationVar); 2548 2549 // Create a reference to the iteration variable. 2550 ExprResult IterationVarRef 2551 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2552 assert(!IterationVarRef.isInvalid() && 2553 "Reference to invented variable cannot fail!"); 2554 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2555 assert(!IterationVarRef.isInvalid() && 2556 "Conversion of invented variable cannot fail!"); 2557 2558 // Subscript the array with this iteration variable. 2559 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2560 IterationVarRef.take(), 2561 Loc); 2562 if (CtorArg.isInvalid()) 2563 return true; 2564 2565 BaseType = Array->getElementType(); 2566 } 2567 2568 // The array subscript expression is an lvalue, which is wrong for moving. 2569 if (Moving && InitializingArray) 2570 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2571 2572 // Construct the entity that we will be initializing. For an array, this 2573 // will be first element in the array, which may require several levels 2574 // of array-subscript entities. 2575 SmallVector<InitializedEntity, 4> Entities; 2576 Entities.reserve(1 + IndexVariables.size()); 2577 if (Indirect) 2578 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2579 else 2580 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2581 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2582 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2583 0, 2584 Entities.back())); 2585 2586 // Direct-initialize to use the copy constructor. 2587 InitializationKind InitKind = 2588 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2589 2590 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2591 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2592 &CtorArgE, 1); 2593 2594 ExprResult MemberInit 2595 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2596 MultiExprArg(&CtorArgE, 1)); 2597 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2598 if (MemberInit.isInvalid()) 2599 return true; 2600 2601 if (Indirect) { 2602 assert(IndexVariables.size() == 0 && 2603 "Indirect field improperly initialized"); 2604 CXXMemberInit 2605 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2606 Loc, Loc, 2607 MemberInit.takeAs<Expr>(), 2608 Loc); 2609 } else 2610 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2611 Loc, MemberInit.takeAs<Expr>(), 2612 Loc, 2613 IndexVariables.data(), 2614 IndexVariables.size()); 2615 return false; 2616 } 2617 2618 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2619 2620 QualType FieldBaseElementType = 2621 SemaRef.Context.getBaseElementType(Field->getType()); 2622 2623 if (FieldBaseElementType->isRecordType()) { 2624 InitializedEntity InitEntity 2625 = Indirect? InitializedEntity::InitializeMember(Indirect) 2626 : InitializedEntity::InitializeMember(Field); 2627 InitializationKind InitKind = 2628 InitializationKind::CreateDefault(Loc); 2629 2630 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2631 ExprResult MemberInit = 2632 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2633 2634 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2635 if (MemberInit.isInvalid()) 2636 return true; 2637 2638 if (Indirect) 2639 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2640 Indirect, Loc, 2641 Loc, 2642 MemberInit.get(), 2643 Loc); 2644 else 2645 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2646 Field, Loc, Loc, 2647 MemberInit.get(), 2648 Loc); 2649 return false; 2650 } 2651 2652 if (!Field->getParent()->isUnion()) { 2653 if (FieldBaseElementType->isReferenceType()) { 2654 SemaRef.Diag(Constructor->getLocation(), 2655 diag::err_uninitialized_member_in_ctor) 2656 << (int)Constructor->isImplicit() 2657 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2658 << 0 << Field->getDeclName(); 2659 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2660 return true; 2661 } 2662 2663 if (FieldBaseElementType.isConstQualified()) { 2664 SemaRef.Diag(Constructor->getLocation(), 2665 diag::err_uninitialized_member_in_ctor) 2666 << (int)Constructor->isImplicit() 2667 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2668 << 1 << Field->getDeclName(); 2669 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2670 return true; 2671 } 2672 } 2673 2674 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2675 FieldBaseElementType->isObjCRetainableType() && 2676 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2677 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2678 // Instant objects: 2679 // Default-initialize Objective-C pointers to NULL. 2680 CXXMemberInit 2681 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2682 Loc, Loc, 2683 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2684 Loc); 2685 return false; 2686 } 2687 2688 // Nothing to initialize. 2689 CXXMemberInit = 0; 2690 return false; 2691} 2692 2693namespace { 2694struct BaseAndFieldInfo { 2695 Sema &S; 2696 CXXConstructorDecl *Ctor; 2697 bool AnyErrorsInInits; 2698 ImplicitInitializerKind IIK; 2699 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2700 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2701 2702 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2703 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2704 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2705 if (Generated && Ctor->isCopyConstructor()) 2706 IIK = IIK_Copy; 2707 else if (Generated && Ctor->isMoveConstructor()) 2708 IIK = IIK_Move; 2709 else 2710 IIK = IIK_Default; 2711 } 2712 2713 bool isImplicitCopyOrMove() const { 2714 switch (IIK) { 2715 case IIK_Copy: 2716 case IIK_Move: 2717 return true; 2718 2719 case IIK_Default: 2720 return false; 2721 } 2722 2723 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2724 } 2725}; 2726} 2727 2728/// \brief Determine whether the given indirect field declaration is somewhere 2729/// within an anonymous union. 2730static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2731 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2732 CEnd = F->chain_end(); 2733 C != CEnd; ++C) 2734 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2735 if (Record->isUnion()) 2736 return true; 2737 2738 return false; 2739} 2740 2741/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2742/// array type. 2743static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2744 if (T->isIncompleteArrayType()) 2745 return true; 2746 2747 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2748 if (!ArrayT->getSize()) 2749 return true; 2750 2751 T = ArrayT->getElementType(); 2752 } 2753 2754 return false; 2755} 2756 2757static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2758 FieldDecl *Field, 2759 IndirectFieldDecl *Indirect = 0) { 2760 2761 // Overwhelmingly common case: we have a direct initializer for this field. 2762 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2763 Info.AllToInit.push_back(Init); 2764 return false; 2765 } 2766 2767 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2768 // has a brace-or-equal-initializer, the entity is initialized as specified 2769 // in [dcl.init]. 2770 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2771 CXXCtorInitializer *Init; 2772 if (Indirect) 2773 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2774 SourceLocation(), 2775 SourceLocation(), 0, 2776 SourceLocation()); 2777 else 2778 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2779 SourceLocation(), 2780 SourceLocation(), 0, 2781 SourceLocation()); 2782 Info.AllToInit.push_back(Init); 2783 return false; 2784 } 2785 2786 // Don't build an implicit initializer for union members if none was 2787 // explicitly specified. 2788 if (Field->getParent()->isUnion() || 2789 (Indirect && isWithinAnonymousUnion(Indirect))) 2790 return false; 2791 2792 // Don't initialize incomplete or zero-length arrays. 2793 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2794 return false; 2795 2796 // Don't try to build an implicit initializer if there were semantic 2797 // errors in any of the initializers (and therefore we might be 2798 // missing some that the user actually wrote). 2799 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2800 return false; 2801 2802 CXXCtorInitializer *Init = 0; 2803 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2804 Indirect, Init)) 2805 return true; 2806 2807 if (Init) 2808 Info.AllToInit.push_back(Init); 2809 2810 return false; 2811} 2812 2813bool 2814Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2815 CXXCtorInitializer *Initializer) { 2816 assert(Initializer->isDelegatingInitializer()); 2817 Constructor->setNumCtorInitializers(1); 2818 CXXCtorInitializer **initializer = 2819 new (Context) CXXCtorInitializer*[1]; 2820 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2821 Constructor->setCtorInitializers(initializer); 2822 2823 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2824 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2825 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2826 } 2827 2828 DelegatingCtorDecls.push_back(Constructor); 2829 2830 return false; 2831} 2832 2833bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2834 CXXCtorInitializer **Initializers, 2835 unsigned NumInitializers, 2836 bool AnyErrors) { 2837 if (Constructor->isDependentContext()) { 2838 // Just store the initializers as written, they will be checked during 2839 // instantiation. 2840 if (NumInitializers > 0) { 2841 Constructor->setNumCtorInitializers(NumInitializers); 2842 CXXCtorInitializer **baseOrMemberInitializers = 2843 new (Context) CXXCtorInitializer*[NumInitializers]; 2844 memcpy(baseOrMemberInitializers, Initializers, 2845 NumInitializers * sizeof(CXXCtorInitializer*)); 2846 Constructor->setCtorInitializers(baseOrMemberInitializers); 2847 } 2848 2849 return false; 2850 } 2851 2852 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2853 2854 // We need to build the initializer AST according to order of construction 2855 // and not what user specified in the Initializers list. 2856 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2857 if (!ClassDecl) 2858 return true; 2859 2860 bool HadError = false; 2861 2862 for (unsigned i = 0; i < NumInitializers; i++) { 2863 CXXCtorInitializer *Member = Initializers[i]; 2864 2865 if (Member->isBaseInitializer()) 2866 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2867 else 2868 Info.AllBaseFields[Member->getAnyMember()] = Member; 2869 } 2870 2871 // Keep track of the direct virtual bases. 2872 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2873 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2874 E = ClassDecl->bases_end(); I != E; ++I) { 2875 if (I->isVirtual()) 2876 DirectVBases.insert(I); 2877 } 2878 2879 // Push virtual bases before others. 2880 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2881 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2882 2883 if (CXXCtorInitializer *Value 2884 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2885 Info.AllToInit.push_back(Value); 2886 } else if (!AnyErrors) { 2887 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2888 CXXCtorInitializer *CXXBaseInit; 2889 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2890 VBase, IsInheritedVirtualBase, 2891 CXXBaseInit)) { 2892 HadError = true; 2893 continue; 2894 } 2895 2896 Info.AllToInit.push_back(CXXBaseInit); 2897 } 2898 } 2899 2900 // Non-virtual bases. 2901 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2902 E = ClassDecl->bases_end(); Base != E; ++Base) { 2903 // Virtuals are in the virtual base list and already constructed. 2904 if (Base->isVirtual()) 2905 continue; 2906 2907 if (CXXCtorInitializer *Value 2908 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2909 Info.AllToInit.push_back(Value); 2910 } else if (!AnyErrors) { 2911 CXXCtorInitializer *CXXBaseInit; 2912 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2913 Base, /*IsInheritedVirtualBase=*/false, 2914 CXXBaseInit)) { 2915 HadError = true; 2916 continue; 2917 } 2918 2919 Info.AllToInit.push_back(CXXBaseInit); 2920 } 2921 } 2922 2923 // Fields. 2924 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2925 MemEnd = ClassDecl->decls_end(); 2926 Mem != MemEnd; ++Mem) { 2927 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2928 // C++ [class.bit]p2: 2929 // A declaration for a bit-field that omits the identifier declares an 2930 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2931 // initialized. 2932 if (F->isUnnamedBitfield()) 2933 continue; 2934 2935 // If we're not generating the implicit copy/move constructor, then we'll 2936 // handle anonymous struct/union fields based on their individual 2937 // indirect fields. 2938 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2939 continue; 2940 2941 if (CollectFieldInitializer(*this, Info, F)) 2942 HadError = true; 2943 continue; 2944 } 2945 2946 // Beyond this point, we only consider default initialization. 2947 if (Info.IIK != IIK_Default) 2948 continue; 2949 2950 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2951 if (F->getType()->isIncompleteArrayType()) { 2952 assert(ClassDecl->hasFlexibleArrayMember() && 2953 "Incomplete array type is not valid"); 2954 continue; 2955 } 2956 2957 // Initialize each field of an anonymous struct individually. 2958 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2959 HadError = true; 2960 2961 continue; 2962 } 2963 } 2964 2965 NumInitializers = Info.AllToInit.size(); 2966 if (NumInitializers > 0) { 2967 Constructor->setNumCtorInitializers(NumInitializers); 2968 CXXCtorInitializer **baseOrMemberInitializers = 2969 new (Context) CXXCtorInitializer*[NumInitializers]; 2970 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2971 NumInitializers * sizeof(CXXCtorInitializer*)); 2972 Constructor->setCtorInitializers(baseOrMemberInitializers); 2973 2974 // Constructors implicitly reference the base and member 2975 // destructors. 2976 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2977 Constructor->getParent()); 2978 } 2979 2980 return HadError; 2981} 2982 2983static void *GetKeyForTopLevelField(FieldDecl *Field) { 2984 // For anonymous unions, use the class declaration as the key. 2985 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2986 if (RT->getDecl()->isAnonymousStructOrUnion()) 2987 return static_cast<void *>(RT->getDecl()); 2988 } 2989 return static_cast<void *>(Field); 2990} 2991 2992static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2993 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2994} 2995 2996static void *GetKeyForMember(ASTContext &Context, 2997 CXXCtorInitializer *Member) { 2998 if (!Member->isAnyMemberInitializer()) 2999 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3000 3001 // For fields injected into the class via declaration of an anonymous union, 3002 // use its anonymous union class declaration as the unique key. 3003 FieldDecl *Field = Member->getAnyMember(); 3004 3005 // If the field is a member of an anonymous struct or union, our key 3006 // is the anonymous record decl that's a direct child of the class. 3007 RecordDecl *RD = Field->getParent(); 3008 if (RD->isAnonymousStructOrUnion()) { 3009 while (true) { 3010 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3011 if (Parent->isAnonymousStructOrUnion()) 3012 RD = Parent; 3013 else 3014 break; 3015 } 3016 3017 return static_cast<void *>(RD); 3018 } 3019 3020 return static_cast<void *>(Field); 3021} 3022 3023static void 3024DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3025 const CXXConstructorDecl *Constructor, 3026 CXXCtorInitializer **Inits, 3027 unsigned NumInits) { 3028 if (Constructor->getDeclContext()->isDependentContext()) 3029 return; 3030 3031 // Don't check initializers order unless the warning is enabled at the 3032 // location of at least one initializer. 3033 bool ShouldCheckOrder = false; 3034 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3035 CXXCtorInitializer *Init = Inits[InitIndex]; 3036 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3037 Init->getSourceLocation()) 3038 != DiagnosticsEngine::Ignored) { 3039 ShouldCheckOrder = true; 3040 break; 3041 } 3042 } 3043 if (!ShouldCheckOrder) 3044 return; 3045 3046 // Build the list of bases and members in the order that they'll 3047 // actually be initialized. The explicit initializers should be in 3048 // this same order but may be missing things. 3049 SmallVector<const void*, 32> IdealInitKeys; 3050 3051 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3052 3053 // 1. Virtual bases. 3054 for (CXXRecordDecl::base_class_const_iterator VBase = 3055 ClassDecl->vbases_begin(), 3056 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3057 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3058 3059 // 2. Non-virtual bases. 3060 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3061 E = ClassDecl->bases_end(); Base != E; ++Base) { 3062 if (Base->isVirtual()) 3063 continue; 3064 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3065 } 3066 3067 // 3. Direct fields. 3068 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3069 E = ClassDecl->field_end(); Field != E; ++Field) { 3070 if (Field->isUnnamedBitfield()) 3071 continue; 3072 3073 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3074 } 3075 3076 unsigned NumIdealInits = IdealInitKeys.size(); 3077 unsigned IdealIndex = 0; 3078 3079 CXXCtorInitializer *PrevInit = 0; 3080 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3081 CXXCtorInitializer *Init = Inits[InitIndex]; 3082 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3083 3084 // Scan forward to try to find this initializer in the idealized 3085 // initializers list. 3086 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3087 if (InitKey == IdealInitKeys[IdealIndex]) 3088 break; 3089 3090 // If we didn't find this initializer, it must be because we 3091 // scanned past it on a previous iteration. That can only 3092 // happen if we're out of order; emit a warning. 3093 if (IdealIndex == NumIdealInits && PrevInit) { 3094 Sema::SemaDiagnosticBuilder D = 3095 SemaRef.Diag(PrevInit->getSourceLocation(), 3096 diag::warn_initializer_out_of_order); 3097 3098 if (PrevInit->isAnyMemberInitializer()) 3099 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3100 else 3101 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3102 3103 if (Init->isAnyMemberInitializer()) 3104 D << 0 << Init->getAnyMember()->getDeclName(); 3105 else 3106 D << 1 << Init->getTypeSourceInfo()->getType(); 3107 3108 // Move back to the initializer's location in the ideal list. 3109 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3110 if (InitKey == IdealInitKeys[IdealIndex]) 3111 break; 3112 3113 assert(IdealIndex != NumIdealInits && 3114 "initializer not found in initializer list"); 3115 } 3116 3117 PrevInit = Init; 3118 } 3119} 3120 3121namespace { 3122bool CheckRedundantInit(Sema &S, 3123 CXXCtorInitializer *Init, 3124 CXXCtorInitializer *&PrevInit) { 3125 if (!PrevInit) { 3126 PrevInit = Init; 3127 return false; 3128 } 3129 3130 if (FieldDecl *Field = Init->getMember()) 3131 S.Diag(Init->getSourceLocation(), 3132 diag::err_multiple_mem_initialization) 3133 << Field->getDeclName() 3134 << Init->getSourceRange(); 3135 else { 3136 const Type *BaseClass = Init->getBaseClass(); 3137 assert(BaseClass && "neither field nor base"); 3138 S.Diag(Init->getSourceLocation(), 3139 diag::err_multiple_base_initialization) 3140 << QualType(BaseClass, 0) 3141 << Init->getSourceRange(); 3142 } 3143 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3144 << 0 << PrevInit->getSourceRange(); 3145 3146 return true; 3147} 3148 3149typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3150typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3151 3152bool CheckRedundantUnionInit(Sema &S, 3153 CXXCtorInitializer *Init, 3154 RedundantUnionMap &Unions) { 3155 FieldDecl *Field = Init->getAnyMember(); 3156 RecordDecl *Parent = Field->getParent(); 3157 NamedDecl *Child = Field; 3158 3159 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3160 if (Parent->isUnion()) { 3161 UnionEntry &En = Unions[Parent]; 3162 if (En.first && En.first != Child) { 3163 S.Diag(Init->getSourceLocation(), 3164 diag::err_multiple_mem_union_initialization) 3165 << Field->getDeclName() 3166 << Init->getSourceRange(); 3167 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3168 << 0 << En.second->getSourceRange(); 3169 return true; 3170 } 3171 if (!En.first) { 3172 En.first = Child; 3173 En.second = Init; 3174 } 3175 if (!Parent->isAnonymousStructOrUnion()) 3176 return false; 3177 } 3178 3179 Child = Parent; 3180 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3181 } 3182 3183 return false; 3184} 3185} 3186 3187/// ActOnMemInitializers - Handle the member initializers for a constructor. 3188void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3189 SourceLocation ColonLoc, 3190 CXXCtorInitializer **meminits, 3191 unsigned NumMemInits, 3192 bool AnyErrors) { 3193 if (!ConstructorDecl) 3194 return; 3195 3196 AdjustDeclIfTemplate(ConstructorDecl); 3197 3198 CXXConstructorDecl *Constructor 3199 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3200 3201 if (!Constructor) { 3202 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3203 return; 3204 } 3205 3206 CXXCtorInitializer **MemInits = 3207 reinterpret_cast<CXXCtorInitializer **>(meminits); 3208 3209 // Mapping for the duplicate initializers check. 3210 // For member initializers, this is keyed with a FieldDecl*. 3211 // For base initializers, this is keyed with a Type*. 3212 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3213 3214 // Mapping for the inconsistent anonymous-union initializers check. 3215 RedundantUnionMap MemberUnions; 3216 3217 bool HadError = false; 3218 for (unsigned i = 0; i < NumMemInits; i++) { 3219 CXXCtorInitializer *Init = MemInits[i]; 3220 3221 // Set the source order index. 3222 Init->setSourceOrder(i); 3223 3224 if (Init->isAnyMemberInitializer()) { 3225 FieldDecl *Field = Init->getAnyMember(); 3226 if (CheckRedundantInit(*this, Init, Members[Field]) || 3227 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3228 HadError = true; 3229 } else if (Init->isBaseInitializer()) { 3230 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3231 if (CheckRedundantInit(*this, Init, Members[Key])) 3232 HadError = true; 3233 } else { 3234 assert(Init->isDelegatingInitializer()); 3235 // This must be the only initializer 3236 if (i != 0 || NumMemInits > 1) { 3237 Diag(MemInits[0]->getSourceLocation(), 3238 diag::err_delegating_initializer_alone) 3239 << MemInits[0]->getSourceRange(); 3240 HadError = true; 3241 // We will treat this as being the only initializer. 3242 } 3243 SetDelegatingInitializer(Constructor, MemInits[i]); 3244 // Return immediately as the initializer is set. 3245 return; 3246 } 3247 } 3248 3249 if (HadError) 3250 return; 3251 3252 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3253 3254 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3255} 3256 3257void 3258Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3259 CXXRecordDecl *ClassDecl) { 3260 // Ignore dependent contexts. Also ignore unions, since their members never 3261 // have destructors implicitly called. 3262 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3263 return; 3264 3265 // FIXME: all the access-control diagnostics are positioned on the 3266 // field/base declaration. That's probably good; that said, the 3267 // user might reasonably want to know why the destructor is being 3268 // emitted, and we currently don't say. 3269 3270 // Non-static data members. 3271 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3272 E = ClassDecl->field_end(); I != E; ++I) { 3273 FieldDecl *Field = *I; 3274 if (Field->isInvalidDecl()) 3275 continue; 3276 3277 // Don't destroy incomplete or zero-length arrays. 3278 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3279 continue; 3280 3281 QualType FieldType = Context.getBaseElementType(Field->getType()); 3282 3283 const RecordType* RT = FieldType->getAs<RecordType>(); 3284 if (!RT) 3285 continue; 3286 3287 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3288 if (FieldClassDecl->isInvalidDecl()) 3289 continue; 3290 if (FieldClassDecl->hasIrrelevantDestructor()) 3291 continue; 3292 3293 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3294 assert(Dtor && "No dtor found for FieldClassDecl!"); 3295 CheckDestructorAccess(Field->getLocation(), Dtor, 3296 PDiag(diag::err_access_dtor_field) 3297 << Field->getDeclName() 3298 << FieldType); 3299 3300 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3301 DiagnoseUseOfDecl(Dtor, Location); 3302 } 3303 3304 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3305 3306 // Bases. 3307 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3308 E = ClassDecl->bases_end(); Base != E; ++Base) { 3309 // Bases are always records in a well-formed non-dependent class. 3310 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3311 3312 // Remember direct virtual bases. 3313 if (Base->isVirtual()) 3314 DirectVirtualBases.insert(RT); 3315 3316 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3317 // If our base class is invalid, we probably can't get its dtor anyway. 3318 if (BaseClassDecl->isInvalidDecl()) 3319 continue; 3320 if (BaseClassDecl->hasIrrelevantDestructor()) 3321 continue; 3322 3323 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3324 assert(Dtor && "No dtor found for BaseClassDecl!"); 3325 3326 // FIXME: caret should be on the start of the class name 3327 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3328 PDiag(diag::err_access_dtor_base) 3329 << Base->getType() 3330 << Base->getSourceRange()); 3331 3332 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3333 DiagnoseUseOfDecl(Dtor, Location); 3334 } 3335 3336 // Virtual bases. 3337 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3338 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3339 3340 // Bases are always records in a well-formed non-dependent class. 3341 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3342 3343 // Ignore direct virtual bases. 3344 if (DirectVirtualBases.count(RT)) 3345 continue; 3346 3347 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3348 // If our base class is invalid, we probably can't get its dtor anyway. 3349 if (BaseClassDecl->isInvalidDecl()) 3350 continue; 3351 if (BaseClassDecl->hasIrrelevantDestructor()) 3352 continue; 3353 3354 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3355 assert(Dtor && "No dtor found for BaseClassDecl!"); 3356 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3357 PDiag(diag::err_access_dtor_vbase) 3358 << VBase->getType()); 3359 3360 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3361 DiagnoseUseOfDecl(Dtor, Location); 3362 } 3363} 3364 3365void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3366 if (!CDtorDecl) 3367 return; 3368 3369 if (CXXConstructorDecl *Constructor 3370 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3371 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3372} 3373 3374bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3375 unsigned DiagID, AbstractDiagSelID SelID) { 3376 if (SelID == -1) 3377 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3378 else 3379 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3380} 3381 3382bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3383 const PartialDiagnostic &PD) { 3384 if (!getLangOptions().CPlusPlus) 3385 return false; 3386 3387 if (const ArrayType *AT = Context.getAsArrayType(T)) 3388 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3389 3390 if (const PointerType *PT = T->getAs<PointerType>()) { 3391 // Find the innermost pointer type. 3392 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3393 PT = T; 3394 3395 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3396 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3397 } 3398 3399 const RecordType *RT = T->getAs<RecordType>(); 3400 if (!RT) 3401 return false; 3402 3403 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3404 3405 // We can't answer whether something is abstract until it has a 3406 // definition. If it's currently being defined, we'll walk back 3407 // over all the declarations when we have a full definition. 3408 const CXXRecordDecl *Def = RD->getDefinition(); 3409 if (!Def || Def->isBeingDefined()) 3410 return false; 3411 3412 if (!RD->isAbstract()) 3413 return false; 3414 3415 Diag(Loc, PD) << RD->getDeclName(); 3416 DiagnoseAbstractType(RD); 3417 3418 return true; 3419} 3420 3421void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3422 // Check if we've already emitted the list of pure virtual functions 3423 // for this class. 3424 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3425 return; 3426 3427 CXXFinalOverriderMap FinalOverriders; 3428 RD->getFinalOverriders(FinalOverriders); 3429 3430 // Keep a set of seen pure methods so we won't diagnose the same method 3431 // more than once. 3432 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3433 3434 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3435 MEnd = FinalOverriders.end(); 3436 M != MEnd; 3437 ++M) { 3438 for (OverridingMethods::iterator SO = M->second.begin(), 3439 SOEnd = M->second.end(); 3440 SO != SOEnd; ++SO) { 3441 // C++ [class.abstract]p4: 3442 // A class is abstract if it contains or inherits at least one 3443 // pure virtual function for which the final overrider is pure 3444 // virtual. 3445 3446 // 3447 if (SO->second.size() != 1) 3448 continue; 3449 3450 if (!SO->second.front().Method->isPure()) 3451 continue; 3452 3453 if (!SeenPureMethods.insert(SO->second.front().Method)) 3454 continue; 3455 3456 Diag(SO->second.front().Method->getLocation(), 3457 diag::note_pure_virtual_function) 3458 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3459 } 3460 } 3461 3462 if (!PureVirtualClassDiagSet) 3463 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3464 PureVirtualClassDiagSet->insert(RD); 3465} 3466 3467namespace { 3468struct AbstractUsageInfo { 3469 Sema &S; 3470 CXXRecordDecl *Record; 3471 CanQualType AbstractType; 3472 bool Invalid; 3473 3474 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3475 : S(S), Record(Record), 3476 AbstractType(S.Context.getCanonicalType( 3477 S.Context.getTypeDeclType(Record))), 3478 Invalid(false) {} 3479 3480 void DiagnoseAbstractType() { 3481 if (Invalid) return; 3482 S.DiagnoseAbstractType(Record); 3483 Invalid = true; 3484 } 3485 3486 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3487}; 3488 3489struct CheckAbstractUsage { 3490 AbstractUsageInfo &Info; 3491 const NamedDecl *Ctx; 3492 3493 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3494 : Info(Info), Ctx(Ctx) {} 3495 3496 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3497 switch (TL.getTypeLocClass()) { 3498#define ABSTRACT_TYPELOC(CLASS, PARENT) 3499#define TYPELOC(CLASS, PARENT) \ 3500 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3501#include "clang/AST/TypeLocNodes.def" 3502 } 3503 } 3504 3505 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3506 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3507 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3508 if (!TL.getArg(I)) 3509 continue; 3510 3511 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3512 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3513 } 3514 } 3515 3516 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3517 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3518 } 3519 3520 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3521 // Visit the type parameters from a permissive context. 3522 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3523 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3524 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3525 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3526 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3527 // TODO: other template argument types? 3528 } 3529 } 3530 3531 // Visit pointee types from a permissive context. 3532#define CheckPolymorphic(Type) \ 3533 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3534 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3535 } 3536 CheckPolymorphic(PointerTypeLoc) 3537 CheckPolymorphic(ReferenceTypeLoc) 3538 CheckPolymorphic(MemberPointerTypeLoc) 3539 CheckPolymorphic(BlockPointerTypeLoc) 3540 CheckPolymorphic(AtomicTypeLoc) 3541 3542 /// Handle all the types we haven't given a more specific 3543 /// implementation for above. 3544 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3545 // Every other kind of type that we haven't called out already 3546 // that has an inner type is either (1) sugar or (2) contains that 3547 // inner type in some way as a subobject. 3548 if (TypeLoc Next = TL.getNextTypeLoc()) 3549 return Visit(Next, Sel); 3550 3551 // If there's no inner type and we're in a permissive context, 3552 // don't diagnose. 3553 if (Sel == Sema::AbstractNone) return; 3554 3555 // Check whether the type matches the abstract type. 3556 QualType T = TL.getType(); 3557 if (T->isArrayType()) { 3558 Sel = Sema::AbstractArrayType; 3559 T = Info.S.Context.getBaseElementType(T); 3560 } 3561 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3562 if (CT != Info.AbstractType) return; 3563 3564 // It matched; do some magic. 3565 if (Sel == Sema::AbstractArrayType) { 3566 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3567 << T << TL.getSourceRange(); 3568 } else { 3569 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3570 << Sel << T << TL.getSourceRange(); 3571 } 3572 Info.DiagnoseAbstractType(); 3573 } 3574}; 3575 3576void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3577 Sema::AbstractDiagSelID Sel) { 3578 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3579} 3580 3581} 3582 3583/// Check for invalid uses of an abstract type in a method declaration. 3584static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3585 CXXMethodDecl *MD) { 3586 // No need to do the check on definitions, which require that 3587 // the return/param types be complete. 3588 if (MD->doesThisDeclarationHaveABody()) 3589 return; 3590 3591 // For safety's sake, just ignore it if we don't have type source 3592 // information. This should never happen for non-implicit methods, 3593 // but... 3594 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3595 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3596} 3597 3598/// Check for invalid uses of an abstract type within a class definition. 3599static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3600 CXXRecordDecl *RD) { 3601 for (CXXRecordDecl::decl_iterator 3602 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3603 Decl *D = *I; 3604 if (D->isImplicit()) continue; 3605 3606 // Methods and method templates. 3607 if (isa<CXXMethodDecl>(D)) { 3608 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3609 } else if (isa<FunctionTemplateDecl>(D)) { 3610 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3611 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3612 3613 // Fields and static variables. 3614 } else if (isa<FieldDecl>(D)) { 3615 FieldDecl *FD = cast<FieldDecl>(D); 3616 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3617 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3618 } else if (isa<VarDecl>(D)) { 3619 VarDecl *VD = cast<VarDecl>(D); 3620 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3621 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3622 3623 // Nested classes and class templates. 3624 } else if (isa<CXXRecordDecl>(D)) { 3625 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3626 } else if (isa<ClassTemplateDecl>(D)) { 3627 CheckAbstractClassUsage(Info, 3628 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3629 } 3630 } 3631} 3632 3633/// \brief Perform semantic checks on a class definition that has been 3634/// completing, introducing implicitly-declared members, checking for 3635/// abstract types, etc. 3636void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3637 if (!Record) 3638 return; 3639 3640 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3641 AbstractUsageInfo Info(*this, Record); 3642 CheckAbstractClassUsage(Info, Record); 3643 } 3644 3645 // If this is not an aggregate type and has no user-declared constructor, 3646 // complain about any non-static data members of reference or const scalar 3647 // type, since they will never get initializers. 3648 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3649 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3650 !Record->isLambda()) { 3651 bool Complained = false; 3652 for (RecordDecl::field_iterator F = Record->field_begin(), 3653 FEnd = Record->field_end(); 3654 F != FEnd; ++F) { 3655 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3656 continue; 3657 3658 if (F->getType()->isReferenceType() || 3659 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3660 if (!Complained) { 3661 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3662 << Record->getTagKind() << Record; 3663 Complained = true; 3664 } 3665 3666 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3667 << F->getType()->isReferenceType() 3668 << F->getDeclName(); 3669 } 3670 } 3671 } 3672 3673 if (Record->isDynamicClass() && !Record->isDependentType()) 3674 DynamicClasses.push_back(Record); 3675 3676 if (Record->getIdentifier()) { 3677 // C++ [class.mem]p13: 3678 // If T is the name of a class, then each of the following shall have a 3679 // name different from T: 3680 // - every member of every anonymous union that is a member of class T. 3681 // 3682 // C++ [class.mem]p14: 3683 // In addition, if class T has a user-declared constructor (12.1), every 3684 // non-static data member of class T shall have a name different from T. 3685 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3686 R.first != R.second; ++R.first) { 3687 NamedDecl *D = *R.first; 3688 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3689 isa<IndirectFieldDecl>(D)) { 3690 Diag(D->getLocation(), diag::err_member_name_of_class) 3691 << D->getDeclName(); 3692 break; 3693 } 3694 } 3695 } 3696 3697 // Warn if the class has virtual methods but non-virtual public destructor. 3698 if (Record->isPolymorphic() && !Record->isDependentType()) { 3699 CXXDestructorDecl *dtor = Record->getDestructor(); 3700 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3701 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3702 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3703 } 3704 3705 // See if a method overloads virtual methods in a base 3706 /// class without overriding any. 3707 if (!Record->isDependentType()) { 3708 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3709 MEnd = Record->method_end(); 3710 M != MEnd; ++M) { 3711 if (!(*M)->isStatic()) 3712 DiagnoseHiddenVirtualMethods(Record, *M); 3713 } 3714 } 3715 3716 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3717 // function that is not a constructor declares that member function to be 3718 // const. [...] The class of which that function is a member shall be 3719 // a literal type. 3720 // 3721 // If the class has virtual bases, any constexpr members will already have 3722 // been diagnosed by the checks performed on the member declaration, so 3723 // suppress this (less useful) diagnostic. 3724 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3725 !Record->isLiteral() && !Record->getNumVBases()) { 3726 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3727 MEnd = Record->method_end(); 3728 M != MEnd; ++M) { 3729 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3730 switch (Record->getTemplateSpecializationKind()) { 3731 case TSK_ImplicitInstantiation: 3732 case TSK_ExplicitInstantiationDeclaration: 3733 case TSK_ExplicitInstantiationDefinition: 3734 // If a template instantiates to a non-literal type, but its members 3735 // instantiate to constexpr functions, the template is technically 3736 // ill-formed, but we allow it for sanity. 3737 continue; 3738 3739 case TSK_Undeclared: 3740 case TSK_ExplicitSpecialization: 3741 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3742 PDiag(diag::err_constexpr_method_non_literal)); 3743 break; 3744 } 3745 3746 // Only produce one error per class. 3747 break; 3748 } 3749 } 3750 } 3751 3752 // Declare inherited constructors. We do this eagerly here because: 3753 // - The standard requires an eager diagnostic for conflicting inherited 3754 // constructors from different classes. 3755 // - The lazy declaration of the other implicit constructors is so as to not 3756 // waste space and performance on classes that are not meant to be 3757 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3758 // have inherited constructors. 3759 DeclareInheritedConstructors(Record); 3760 3761 if (!Record->isDependentType()) 3762 CheckExplicitlyDefaultedMethods(Record); 3763} 3764 3765void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3766 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3767 ME = Record->method_end(); 3768 MI != ME; ++MI) { 3769 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3770 switch (getSpecialMember(*MI)) { 3771 case CXXDefaultConstructor: 3772 CheckExplicitlyDefaultedDefaultConstructor( 3773 cast<CXXConstructorDecl>(*MI)); 3774 break; 3775 3776 case CXXDestructor: 3777 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3778 break; 3779 3780 case CXXCopyConstructor: 3781 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3782 break; 3783 3784 case CXXCopyAssignment: 3785 CheckExplicitlyDefaultedCopyAssignment(*MI); 3786 break; 3787 3788 case CXXMoveConstructor: 3789 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3790 break; 3791 3792 case CXXMoveAssignment: 3793 CheckExplicitlyDefaultedMoveAssignment(*MI); 3794 break; 3795 3796 case CXXInvalid: 3797 llvm_unreachable("non-special member explicitly defaulted!"); 3798 } 3799 } 3800 } 3801 3802} 3803 3804void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3805 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3806 3807 // Whether this was the first-declared instance of the constructor. 3808 // This affects whether we implicitly add an exception spec (and, eventually, 3809 // constexpr). It is also ill-formed to explicitly default a constructor such 3810 // that it would be deleted. (C++0x [decl.fct.def.default]) 3811 bool First = CD == CD->getCanonicalDecl(); 3812 3813 bool HadError = false; 3814 if (CD->getNumParams() != 0) { 3815 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3816 << CD->getSourceRange(); 3817 HadError = true; 3818 } 3819 3820 ImplicitExceptionSpecification Spec 3821 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3822 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3823 if (EPI.ExceptionSpecType == EST_Delayed) { 3824 // Exception specification depends on some deferred part of the class. We'll 3825 // try again when the class's definition has been fully processed. 3826 return; 3827 } 3828 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3829 *ExceptionType = Context.getFunctionType( 3830 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3831 3832 // C++11 [dcl.fct.def.default]p2: 3833 // An explicitly-defaulted function may be declared constexpr only if it 3834 // would have been implicitly declared as constexpr, 3835 // Do not apply this rule to templates, since core issue 1358 makes such 3836 // functions always instantiate to constexpr functions. 3837 if (CD->isConstexpr() && 3838 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3839 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3840 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3841 << CXXDefaultConstructor; 3842 HadError = true; 3843 } 3844 } 3845 // and may have an explicit exception-specification only if it is compatible 3846 // with the exception-specification on the implicit declaration. 3847 if (CtorType->hasExceptionSpec()) { 3848 if (CheckEquivalentExceptionSpec( 3849 PDiag(diag::err_incorrect_defaulted_exception_spec) 3850 << CXXDefaultConstructor, 3851 PDiag(), 3852 ExceptionType, SourceLocation(), 3853 CtorType, CD->getLocation())) { 3854 HadError = true; 3855 } 3856 } 3857 3858 // If a function is explicitly defaulted on its first declaration, 3859 if (First) { 3860 // -- it is implicitly considered to be constexpr if the implicit 3861 // definition would be, 3862 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3863 3864 // -- it is implicitly considered to have the same 3865 // exception-specification as if it had been implicitly declared 3866 // 3867 // FIXME: a compatible, but different, explicit exception specification 3868 // will be silently overridden. We should issue a warning if this happens. 3869 EPI.ExtInfo = CtorType->getExtInfo(); 3870 } 3871 3872 if (HadError) { 3873 CD->setInvalidDecl(); 3874 return; 3875 } 3876 3877 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3878 if (First) { 3879 CD->setDeletedAsWritten(); 3880 } else { 3881 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3882 << CXXDefaultConstructor; 3883 CD->setInvalidDecl(); 3884 } 3885 } 3886} 3887 3888void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3889 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3890 3891 // Whether this was the first-declared instance of the constructor. 3892 bool First = CD == CD->getCanonicalDecl(); 3893 3894 bool HadError = false; 3895 if (CD->getNumParams() != 1) { 3896 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3897 << CD->getSourceRange(); 3898 HadError = true; 3899 } 3900 3901 ImplicitExceptionSpecification Spec(Context); 3902 bool Const; 3903 llvm::tie(Spec, Const) = 3904 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3905 3906 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3907 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3908 *ExceptionType = Context.getFunctionType( 3909 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3910 3911 // Check for parameter type matching. 3912 // This is a copy ctor so we know it's a cv-qualified reference to T. 3913 QualType ArgType = CtorType->getArgType(0); 3914 if (ArgType->getPointeeType().isVolatileQualified()) { 3915 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3916 HadError = true; 3917 } 3918 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3919 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3920 HadError = true; 3921 } 3922 3923 // C++11 [dcl.fct.def.default]p2: 3924 // An explicitly-defaulted function may be declared constexpr only if it 3925 // would have been implicitly declared as constexpr, 3926 // Do not apply this rule to templates, since core issue 1358 makes such 3927 // functions always instantiate to constexpr functions. 3928 if (CD->isConstexpr() && 3929 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3930 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3931 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3932 << CXXCopyConstructor; 3933 HadError = true; 3934 } 3935 } 3936 // and may have an explicit exception-specification only if it is compatible 3937 // with the exception-specification on the implicit declaration. 3938 if (CtorType->hasExceptionSpec()) { 3939 if (CheckEquivalentExceptionSpec( 3940 PDiag(diag::err_incorrect_defaulted_exception_spec) 3941 << CXXCopyConstructor, 3942 PDiag(), 3943 ExceptionType, SourceLocation(), 3944 CtorType, CD->getLocation())) { 3945 HadError = true; 3946 } 3947 } 3948 3949 // If a function is explicitly defaulted on its first declaration, 3950 if (First) { 3951 // -- it is implicitly considered to be constexpr if the implicit 3952 // definition would be, 3953 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3954 3955 // -- it is implicitly considered to have the same 3956 // exception-specification as if it had been implicitly declared, and 3957 // 3958 // FIXME: a compatible, but different, explicit exception specification 3959 // will be silently overridden. We should issue a warning if this happens. 3960 EPI.ExtInfo = CtorType->getExtInfo(); 3961 3962 // -- [...] it shall have the same parameter type as if it had been 3963 // implicitly declared. 3964 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3965 } 3966 3967 if (HadError) { 3968 CD->setInvalidDecl(); 3969 return; 3970 } 3971 3972 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3973 if (First) { 3974 CD->setDeletedAsWritten(); 3975 } else { 3976 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3977 << CXXCopyConstructor; 3978 CD->setInvalidDecl(); 3979 } 3980 } 3981} 3982 3983void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3984 assert(MD->isExplicitlyDefaulted()); 3985 3986 // Whether this was the first-declared instance of the operator 3987 bool First = MD == MD->getCanonicalDecl(); 3988 3989 bool HadError = false; 3990 if (MD->getNumParams() != 1) { 3991 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3992 << MD->getSourceRange(); 3993 HadError = true; 3994 } 3995 3996 QualType ReturnType = 3997 MD->getType()->getAs<FunctionType>()->getResultType(); 3998 if (!ReturnType->isLValueReferenceType() || 3999 !Context.hasSameType( 4000 Context.getCanonicalType(ReturnType->getPointeeType()), 4001 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4002 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 4003 HadError = true; 4004 } 4005 4006 ImplicitExceptionSpecification Spec(Context); 4007 bool Const; 4008 llvm::tie(Spec, Const) = 4009 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 4010 4011 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4012 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4013 *ExceptionType = Context.getFunctionType( 4014 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4015 4016 QualType ArgType = OperType->getArgType(0); 4017 if (!ArgType->isLValueReferenceType()) { 4018 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4019 HadError = true; 4020 } else { 4021 if (ArgType->getPointeeType().isVolatileQualified()) { 4022 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 4023 HadError = true; 4024 } 4025 if (ArgType->getPointeeType().isConstQualified() && !Const) { 4026 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 4027 HadError = true; 4028 } 4029 } 4030 4031 if (OperType->getTypeQuals()) { 4032 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 4033 HadError = true; 4034 } 4035 4036 if (OperType->hasExceptionSpec()) { 4037 if (CheckEquivalentExceptionSpec( 4038 PDiag(diag::err_incorrect_defaulted_exception_spec) 4039 << CXXCopyAssignment, 4040 PDiag(), 4041 ExceptionType, SourceLocation(), 4042 OperType, MD->getLocation())) { 4043 HadError = true; 4044 } 4045 } 4046 if (First) { 4047 // We set the declaration to have the computed exception spec here. 4048 // We duplicate the one parameter type. 4049 EPI.RefQualifier = OperType->getRefQualifier(); 4050 EPI.ExtInfo = OperType->getExtInfo(); 4051 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4052 } 4053 4054 if (HadError) { 4055 MD->setInvalidDecl(); 4056 return; 4057 } 4058 4059 if (ShouldDeleteSpecialMember(MD, CXXCopyAssignment)) { 4060 if (First) { 4061 MD->setDeletedAsWritten(); 4062 } else { 4063 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4064 << CXXCopyAssignment; 4065 MD->setInvalidDecl(); 4066 } 4067 } 4068} 4069 4070void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 4071 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 4072 4073 // Whether this was the first-declared instance of the constructor. 4074 bool First = CD == CD->getCanonicalDecl(); 4075 4076 bool HadError = false; 4077 if (CD->getNumParams() != 1) { 4078 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4079 << CD->getSourceRange(); 4080 HadError = true; 4081 } 4082 4083 ImplicitExceptionSpecification Spec( 4084 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4085 4086 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4087 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4088 *ExceptionType = Context.getFunctionType( 4089 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4090 4091 // Check for parameter type matching. 4092 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4093 QualType ArgType = CtorType->getArgType(0); 4094 if (ArgType->getPointeeType().isVolatileQualified()) { 4095 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4096 HadError = true; 4097 } 4098 if (ArgType->getPointeeType().isConstQualified()) { 4099 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4100 HadError = true; 4101 } 4102 4103 // C++11 [dcl.fct.def.default]p2: 4104 // An explicitly-defaulted function may be declared constexpr only if it 4105 // would have been implicitly declared as constexpr, 4106 // Do not apply this rule to templates, since core issue 1358 makes such 4107 // functions always instantiate to constexpr functions. 4108 if (CD->isConstexpr() && 4109 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4110 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4111 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4112 << CXXMoveConstructor; 4113 HadError = true; 4114 } 4115 } 4116 // and may have an explicit exception-specification only if it is compatible 4117 // with the exception-specification on the implicit declaration. 4118 if (CtorType->hasExceptionSpec()) { 4119 if (CheckEquivalentExceptionSpec( 4120 PDiag(diag::err_incorrect_defaulted_exception_spec) 4121 << CXXMoveConstructor, 4122 PDiag(), 4123 ExceptionType, SourceLocation(), 4124 CtorType, CD->getLocation())) { 4125 HadError = true; 4126 } 4127 } 4128 4129 // If a function is explicitly defaulted on its first declaration, 4130 if (First) { 4131 // -- it is implicitly considered to be constexpr if the implicit 4132 // definition would be, 4133 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4134 4135 // -- it is implicitly considered to have the same 4136 // exception-specification as if it had been implicitly declared, and 4137 // 4138 // FIXME: a compatible, but different, explicit exception specification 4139 // will be silently overridden. We should issue a warning if this happens. 4140 EPI.ExtInfo = CtorType->getExtInfo(); 4141 4142 // -- [...] it shall have the same parameter type as if it had been 4143 // implicitly declared. 4144 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4145 } 4146 4147 if (HadError) { 4148 CD->setInvalidDecl(); 4149 return; 4150 } 4151 4152 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4153 if (First) { 4154 CD->setDeletedAsWritten(); 4155 } else { 4156 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4157 << CXXMoveConstructor; 4158 CD->setInvalidDecl(); 4159 } 4160 } 4161} 4162 4163void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4164 assert(MD->isExplicitlyDefaulted()); 4165 4166 // Whether this was the first-declared instance of the operator 4167 bool First = MD == MD->getCanonicalDecl(); 4168 4169 bool HadError = false; 4170 if (MD->getNumParams() != 1) { 4171 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4172 << MD->getSourceRange(); 4173 HadError = true; 4174 } 4175 4176 QualType ReturnType = 4177 MD->getType()->getAs<FunctionType>()->getResultType(); 4178 if (!ReturnType->isLValueReferenceType() || 4179 !Context.hasSameType( 4180 Context.getCanonicalType(ReturnType->getPointeeType()), 4181 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4182 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4183 HadError = true; 4184 } 4185 4186 ImplicitExceptionSpecification Spec( 4187 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4188 4189 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4190 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4191 *ExceptionType = Context.getFunctionType( 4192 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4193 4194 QualType ArgType = OperType->getArgType(0); 4195 if (!ArgType->isRValueReferenceType()) { 4196 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4197 HadError = true; 4198 } else { 4199 if (ArgType->getPointeeType().isVolatileQualified()) { 4200 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4201 HadError = true; 4202 } 4203 if (ArgType->getPointeeType().isConstQualified()) { 4204 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4205 HadError = true; 4206 } 4207 } 4208 4209 if (OperType->getTypeQuals()) { 4210 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4211 HadError = true; 4212 } 4213 4214 if (OperType->hasExceptionSpec()) { 4215 if (CheckEquivalentExceptionSpec( 4216 PDiag(diag::err_incorrect_defaulted_exception_spec) 4217 << CXXMoveAssignment, 4218 PDiag(), 4219 ExceptionType, SourceLocation(), 4220 OperType, MD->getLocation())) { 4221 HadError = true; 4222 } 4223 } 4224 if (First) { 4225 // We set the declaration to have the computed exception spec here. 4226 // We duplicate the one parameter type. 4227 EPI.RefQualifier = OperType->getRefQualifier(); 4228 EPI.ExtInfo = OperType->getExtInfo(); 4229 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4230 } 4231 4232 if (HadError) { 4233 MD->setInvalidDecl(); 4234 return; 4235 } 4236 4237 if (ShouldDeleteSpecialMember(MD, CXXMoveAssignment)) { 4238 if (First) { 4239 MD->setDeletedAsWritten(); 4240 } else { 4241 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4242 << CXXMoveAssignment; 4243 MD->setInvalidDecl(); 4244 } 4245 } 4246} 4247 4248void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4249 assert(DD->isExplicitlyDefaulted()); 4250 4251 // Whether this was the first-declared instance of the destructor. 4252 bool First = DD == DD->getCanonicalDecl(); 4253 4254 ImplicitExceptionSpecification Spec 4255 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4256 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4257 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4258 *ExceptionType = Context.getFunctionType( 4259 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4260 4261 if (DtorType->hasExceptionSpec()) { 4262 if (CheckEquivalentExceptionSpec( 4263 PDiag(diag::err_incorrect_defaulted_exception_spec) 4264 << CXXDestructor, 4265 PDiag(), 4266 ExceptionType, SourceLocation(), 4267 DtorType, DD->getLocation())) { 4268 DD->setInvalidDecl(); 4269 return; 4270 } 4271 } 4272 if (First) { 4273 // We set the declaration to have the computed exception spec here. 4274 // There are no parameters. 4275 EPI.ExtInfo = DtorType->getExtInfo(); 4276 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4277 } 4278 4279 if (ShouldDeleteSpecialMember(DD, CXXDestructor)) { 4280 if (First) { 4281 DD->setDeletedAsWritten(); 4282 } else { 4283 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4284 << CXXDestructor; 4285 DD->setInvalidDecl(); 4286 } 4287 } 4288} 4289 4290namespace { 4291struct SpecialMemberDeletionInfo { 4292 Sema &S; 4293 CXXMethodDecl *MD; 4294 Sema::CXXSpecialMember CSM; 4295 4296 // Properties of the special member, computed for convenience. 4297 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4298 SourceLocation Loc; 4299 4300 bool AllFieldsAreConst; 4301 4302 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4303 Sema::CXXSpecialMember CSM) 4304 : S(S), MD(MD), CSM(CSM), 4305 IsConstructor(false), IsAssignment(false), IsMove(false), 4306 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4307 AllFieldsAreConst(true) { 4308 switch (CSM) { 4309 case Sema::CXXDefaultConstructor: 4310 case Sema::CXXCopyConstructor: 4311 IsConstructor = true; 4312 break; 4313 case Sema::CXXMoveConstructor: 4314 IsConstructor = true; 4315 IsMove = true; 4316 break; 4317 case Sema::CXXCopyAssignment: 4318 IsAssignment = true; 4319 break; 4320 case Sema::CXXMoveAssignment: 4321 IsAssignment = true; 4322 IsMove = true; 4323 break; 4324 case Sema::CXXDestructor: 4325 break; 4326 case Sema::CXXInvalid: 4327 llvm_unreachable("invalid special member kind"); 4328 } 4329 4330 if (MD->getNumParams()) { 4331 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4332 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4333 } 4334 } 4335 4336 bool inUnion() const { return MD->getParent()->isUnion(); } 4337 4338 /// Look up the corresponding special member in the given class. 4339 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class) { 4340 unsigned TQ = MD->getTypeQualifiers(); 4341 return S.LookupSpecialMember(Class, CSM, ConstArg, VolatileArg, 4342 MD->getRefQualifier() == RQ_RValue, 4343 TQ & Qualifiers::Const, 4344 TQ & Qualifiers::Volatile); 4345 } 4346 4347 bool shouldDeleteForBase(CXXRecordDecl *BaseDecl, bool IsVirtualBase); 4348 bool shouldDeleteForField(FieldDecl *FD); 4349 bool shouldDeleteForAllConstMembers(); 4350}; 4351} 4352 4353/// Check whether we should delete a special member function due to the class 4354/// having a particular direct or virtual base class. 4355bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXRecordDecl *BaseDecl, 4356 bool IsVirtualBase) { 4357 // C++11 [class.copy]p23: 4358 // -- for the move assignment operator, any direct or indirect virtual 4359 // base class. 4360 if (CSM == Sema::CXXMoveAssignment && IsVirtualBase) 4361 return true; 4362 4363 // C++11 [class.ctor]p5, C++11 [class.copy]p11, C++11 [class.dtor]p5: 4364 // -- any direct or virtual base class [...] has a type with a destructor 4365 // that is deleted or inaccessible 4366 if (!IsAssignment) { 4367 CXXDestructorDecl *BaseDtor = S.LookupDestructor(BaseDecl); 4368 if (BaseDtor->isDeleted()) 4369 return true; 4370 if (S.CheckDestructorAccess(Loc, BaseDtor, S.PDiag()) 4371 != Sema::AR_accessible) 4372 return true; 4373 } 4374 4375 // C++11 [class.ctor]p5: 4376 // -- any direct or virtual base class [...] has class type M [...] and 4377 // either M has no default constructor or overload resolution as applied 4378 // to M's default constructor results in an ambiguity or in a function 4379 // that is deleted or inaccessible 4380 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4381 // -- a direct or virtual base class B that cannot be copied/moved because 4382 // overload resolution, as applied to B's corresponding special member, 4383 // results in an ambiguity or a function that is deleted or inaccessible 4384 // from the defaulted special member 4385 if (CSM != Sema::CXXDestructor) { 4386 Sema::SpecialMemberOverloadResult *SMOR = lookupIn(BaseDecl); 4387 if (!SMOR->hasSuccess()) 4388 return true; 4389 4390 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4391 if (IsConstructor) { 4392 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4393 if (S.CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4394 S.PDiag()) != Sema::AR_accessible) 4395 return true; 4396 4397 // -- for the move constructor, a [...] direct or virtual base class with 4398 // a type that does not have a move constructor and is not trivially 4399 // copyable. 4400 if (IsMove && !BaseCtor->isMoveConstructor() && 4401 !BaseDecl->isTriviallyCopyable()) 4402 return true; 4403 } else { 4404 assert(IsAssignment && "unexpected kind of special member"); 4405 if (S.CheckDirectMemberAccess(Loc, BaseMember, S.PDiag()) 4406 != Sema::AR_accessible) 4407 return true; 4408 4409 // -- for the move assignment operator, a direct base class with a type 4410 // that does not have a move assignment operator and is not trivially 4411 // copyable. 4412 if (IsMove && !BaseMember->isMoveAssignmentOperator() && 4413 !BaseDecl->isTriviallyCopyable()) 4414 return true; 4415 } 4416 } 4417 4418 // C++11 [class.dtor]p5: 4419 // -- for a virtual destructor, lookup of the non-array deallocation function 4420 // results in an ambiguity or in a function that is deleted or inaccessible 4421 if (CSM == Sema::CXXDestructor && MD->isVirtual()) { 4422 FunctionDecl *OperatorDelete = 0; 4423 DeclarationName Name = 4424 S.Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4425 if (S.FindDeallocationFunction(Loc, MD->getParent(), Name, 4426 OperatorDelete, false)) 4427 return true; 4428 } 4429 4430 return false; 4431} 4432 4433/// Check whether we should delete a special member function due to the class 4434/// having a particular non-static data member. 4435bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4436 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4437 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4438 4439 if (CSM == Sema::CXXDefaultConstructor) { 4440 // For a default constructor, all references must be initialized in-class 4441 // and, if a union, it must have a non-const member. 4442 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) 4443 return true; 4444 4445 if (inUnion() && !FieldType.isConstQualified()) 4446 AllFieldsAreConst = false; 4447 } else if (CSM == Sema::CXXCopyConstructor) { 4448 // For a copy constructor, data members must not be of rvalue reference 4449 // type. 4450 if (FieldType->isRValueReferenceType()) 4451 return true; 4452 } else if (IsAssignment) { 4453 // For an assignment operator, data members must not be of reference type. 4454 if (FieldType->isReferenceType()) 4455 return true; 4456 } 4457 4458 if (FieldRecord) { 4459 // For a default constructor, a const member must have a user-provided 4460 // default constructor or else be explicitly initialized. 4461 if (CSM == Sema::CXXDefaultConstructor && FieldType.isConstQualified() && 4462 !FD->hasInClassInitializer() && 4463 !FieldRecord->hasUserProvidedDefaultConstructor()) 4464 return true; 4465 4466 // Some additional restrictions exist on the variant members. 4467 if (!inUnion() && FieldRecord->isUnion() && 4468 FieldRecord->isAnonymousStructOrUnion()) { 4469 bool AllVariantFieldsAreConst = true; 4470 4471 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4472 UE = FieldRecord->field_end(); 4473 UI != UE; ++UI) { 4474 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4475 CXXRecordDecl *UnionFieldRecord = 4476 UnionFieldType->getAsCXXRecordDecl(); 4477 4478 if (!UnionFieldType.isConstQualified()) 4479 AllVariantFieldsAreConst = false; 4480 4481 if (UnionFieldRecord) { 4482 // FIXME: Checking for accessibility and validity of this 4483 // destructor is technically going beyond the 4484 // standard, but this is believed to be a defect. 4485 if (!IsAssignment) { 4486 CXXDestructorDecl *FieldDtor = S.LookupDestructor(UnionFieldRecord); 4487 if (FieldDtor->isDeleted()) 4488 return true; 4489 if (S.CheckDestructorAccess(Loc, FieldDtor, S.PDiag()) != 4490 Sema::AR_accessible) 4491 return true; 4492 if (!FieldDtor->isTrivial()) 4493 return true; 4494 } 4495 4496 // FIXME: in-class initializers should be handled here 4497 if (CSM != Sema::CXXDestructor) { 4498 Sema::SpecialMemberOverloadResult *SMOR = 4499 lookupIn(UnionFieldRecord); 4500 // FIXME: Checking for accessibility and validity of this 4501 // corresponding member is technically going beyond the 4502 // standard, but this is believed to be a defect. 4503 if (!SMOR->hasSuccess()) 4504 return true; 4505 4506 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4507 // A member of a union must have a trivial corresponding 4508 // special member. 4509 if (!FieldMember->isTrivial()) 4510 return true; 4511 4512 if (IsConstructor) { 4513 CXXConstructorDecl *FieldCtor = 4514 cast<CXXConstructorDecl>(FieldMember); 4515 if (S.CheckConstructorAccess(Loc, FieldCtor, 4516 FieldCtor->getAccess(), 4517 S.PDiag()) != Sema::AR_accessible) 4518 return true; 4519 } else { 4520 assert(IsAssignment && "unexpected kind of special member"); 4521 if (S.CheckDirectMemberAccess(Loc, FieldMember, S.PDiag()) 4522 != Sema::AR_accessible) 4523 return true; 4524 } 4525 } 4526 } 4527 } 4528 4529 // At least one member in each anonymous union must be non-const 4530 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst) 4531 return true; 4532 4533 // Don't try to initialize the anonymous union 4534 // This is technically non-conformant, but sanity demands it. 4535 return false; 4536 } 4537 4538 // Unless we're doing assignment, the field's destructor must be 4539 // accessible and not deleted. 4540 if (!IsAssignment) { 4541 CXXDestructorDecl *FieldDtor = S.LookupDestructor(FieldRecord); 4542 if (FieldDtor->isDeleted()) 4543 return true; 4544 if (S.CheckDestructorAccess(Loc, FieldDtor, S.PDiag()) != 4545 Sema::AR_accessible) 4546 return true; 4547 } 4548 4549 // Check that the corresponding member of the field is accessible, 4550 // unique, and non-deleted. We don't do this if it has an explicit 4551 // initialization when default-constructing. 4552 if (CSM != Sema::CXXDestructor && 4553 !(CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer())) { 4554 Sema::SpecialMemberOverloadResult *SMOR = lookupIn(FieldRecord); 4555 if (!SMOR->hasSuccess()) 4556 return true; 4557 4558 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4559 if (IsConstructor) { 4560 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4561 if (S.CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4562 S.PDiag()) != Sema::AR_accessible) 4563 return true; 4564 4565 // For a move operation, the corresponding operation must actually 4566 // be a move operation (and not a copy selected by overload 4567 // resolution) unless we are working on a trivially copyable class. 4568 if (IsMove && !FieldCtor->isMoveConstructor() && 4569 !FieldRecord->isTriviallyCopyable()) 4570 return true; 4571 } else { 4572 assert(IsAssignment && "unexpected kind of special member"); 4573 if (S.CheckDirectMemberAccess(Loc, FieldMember, S.PDiag()) 4574 != Sema::AR_accessible) 4575 return true; 4576 4577 // -- for the move assignment operator, a non-static data member with a 4578 // type that does not have a move assignment operator and is not 4579 // trivially copyable. 4580 if (IsMove && !FieldMember->isMoveAssignmentOperator() && 4581 !FieldRecord->isTriviallyCopyable()) 4582 return true; 4583 } 4584 4585 // We need the corresponding member of a union to be trivial so that 4586 // we can safely copy them all simultaneously. 4587 // FIXME: Note that performing the check here (where we rely on the lack 4588 // of an in-class initializer) is technically ill-formed. However, this 4589 // seems most obviously to be a bug in the standard. 4590 if (inUnion() && !FieldMember->isTrivial()) 4591 return true; 4592 } 4593 } else if (CSM == Sema::CXXDefaultConstructor && !inUnion() && 4594 FieldType.isConstQualified() && !FD->hasInClassInitializer()) { 4595 // We can't initialize a const member of non-class type to any value. 4596 return true; 4597 } else if (IsAssignment && FieldType.isConstQualified()) { 4598 // C++11 [class.copy]p23: 4599 // -- a non-static data member of const non-class type (or array thereof) 4600 return true; 4601 } 4602 4603 return false; 4604} 4605 4606/// C++11 [class.ctor] p5: 4607/// A defaulted default constructor for a class X is defined as deleted if 4608/// X is a union and all of its variant members are of const-qualified type. 4609bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4610 return CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst; 4611} 4612 4613/// Determine whether a defaulted special member function should be defined as 4614/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4615/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4616bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4617 assert(!MD->isInvalidDecl()); 4618 CXXRecordDecl *RD = MD->getParent(); 4619 assert(!RD->isDependentType() && "do deletion after instantiation"); 4620 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4621 return false; 4622 4623 // C++11 [expr.lambda.prim]p19: 4624 // The closure type associated with a lambda-expression has a 4625 // deleted (8.4.3) default constructor and a deleted copy 4626 // assignment operator. 4627 if (RD->isLambda() && 4628 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) 4629 return true; 4630 4631 // For an anonymous struct or union, the copy and assignment special members 4632 // will never be used, so skip the check. For an anonymous union declared at 4633 // namespace scope, the constructor and destructor are used. 4634 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4635 RD->isAnonymousStructOrUnion()) 4636 return false; 4637 4638 // Do access control from the special member function 4639 ContextRAII MethodContext(*this, MD); 4640 4641 SpecialMemberDeletionInfo SMI(*this, MD, CSM); 4642 4643 // FIXME: We should put some diagnostic logic right into this function. 4644 4645 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4646 BE = RD->bases_end(); BI != BE; ++BI) 4647 if (!BI->isVirtual() && 4648 SMI.shouldDeleteForBase(BI->getType()->getAsCXXRecordDecl(), false)) 4649 return true; 4650 4651 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4652 BE = RD->vbases_end(); BI != BE; ++BI) 4653 if (SMI.shouldDeleteForBase(BI->getType()->getAsCXXRecordDecl(), true)) 4654 return true; 4655 4656 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4657 FE = RD->field_end(); FI != FE; ++FI) 4658 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4659 SMI.shouldDeleteForField(*FI)) 4660 return true; 4661 4662 if (SMI.shouldDeleteForAllConstMembers()) 4663 return true; 4664 4665 return false; 4666} 4667 4668/// \brief Data used with FindHiddenVirtualMethod 4669namespace { 4670 struct FindHiddenVirtualMethodData { 4671 Sema *S; 4672 CXXMethodDecl *Method; 4673 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4674 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4675 }; 4676} 4677 4678/// \brief Member lookup function that determines whether a given C++ 4679/// method overloads virtual methods in a base class without overriding any, 4680/// to be used with CXXRecordDecl::lookupInBases(). 4681static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4682 CXXBasePath &Path, 4683 void *UserData) { 4684 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4685 4686 FindHiddenVirtualMethodData &Data 4687 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4688 4689 DeclarationName Name = Data.Method->getDeclName(); 4690 assert(Name.getNameKind() == DeclarationName::Identifier); 4691 4692 bool foundSameNameMethod = false; 4693 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4694 for (Path.Decls = BaseRecord->lookup(Name); 4695 Path.Decls.first != Path.Decls.second; 4696 ++Path.Decls.first) { 4697 NamedDecl *D = *Path.Decls.first; 4698 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4699 MD = MD->getCanonicalDecl(); 4700 foundSameNameMethod = true; 4701 // Interested only in hidden virtual methods. 4702 if (!MD->isVirtual()) 4703 continue; 4704 // If the method we are checking overrides a method from its base 4705 // don't warn about the other overloaded methods. 4706 if (!Data.S->IsOverload(Data.Method, MD, false)) 4707 return true; 4708 // Collect the overload only if its hidden. 4709 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4710 overloadedMethods.push_back(MD); 4711 } 4712 } 4713 4714 if (foundSameNameMethod) 4715 Data.OverloadedMethods.append(overloadedMethods.begin(), 4716 overloadedMethods.end()); 4717 return foundSameNameMethod; 4718} 4719 4720/// \brief See if a method overloads virtual methods in a base class without 4721/// overriding any. 4722void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4723 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4724 MD->getLocation()) == DiagnosticsEngine::Ignored) 4725 return; 4726 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4727 return; 4728 4729 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4730 /*bool RecordPaths=*/false, 4731 /*bool DetectVirtual=*/false); 4732 FindHiddenVirtualMethodData Data; 4733 Data.Method = MD; 4734 Data.S = this; 4735 4736 // Keep the base methods that were overriden or introduced in the subclass 4737 // by 'using' in a set. A base method not in this set is hidden. 4738 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4739 res.first != res.second; ++res.first) { 4740 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4741 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4742 E = MD->end_overridden_methods(); 4743 I != E; ++I) 4744 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4745 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4746 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4747 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4748 } 4749 4750 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4751 !Data.OverloadedMethods.empty()) { 4752 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4753 << MD << (Data.OverloadedMethods.size() > 1); 4754 4755 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4756 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4757 Diag(overloadedMD->getLocation(), 4758 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4759 } 4760 } 4761} 4762 4763void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4764 Decl *TagDecl, 4765 SourceLocation LBrac, 4766 SourceLocation RBrac, 4767 AttributeList *AttrList) { 4768 if (!TagDecl) 4769 return; 4770 4771 AdjustDeclIfTemplate(TagDecl); 4772 4773 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4774 // strict aliasing violation! 4775 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4776 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4777 4778 CheckCompletedCXXClass( 4779 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4780} 4781 4782/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4783/// special functions, such as the default constructor, copy 4784/// constructor, or destructor, to the given C++ class (C++ 4785/// [special]p1). This routine can only be executed just before the 4786/// definition of the class is complete. 4787void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4788 if (!ClassDecl->hasUserDeclaredConstructor()) 4789 ++ASTContext::NumImplicitDefaultConstructors; 4790 4791 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4792 ++ASTContext::NumImplicitCopyConstructors; 4793 4794 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4795 ++ASTContext::NumImplicitMoveConstructors; 4796 4797 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4798 ++ASTContext::NumImplicitCopyAssignmentOperators; 4799 4800 // If we have a dynamic class, then the copy assignment operator may be 4801 // virtual, so we have to declare it immediately. This ensures that, e.g., 4802 // it shows up in the right place in the vtable and that we diagnose 4803 // problems with the implicit exception specification. 4804 if (ClassDecl->isDynamicClass()) 4805 DeclareImplicitCopyAssignment(ClassDecl); 4806 } 4807 4808 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()){ 4809 ++ASTContext::NumImplicitMoveAssignmentOperators; 4810 4811 // Likewise for the move assignment operator. 4812 if (ClassDecl->isDynamicClass()) 4813 DeclareImplicitMoveAssignment(ClassDecl); 4814 } 4815 4816 if (!ClassDecl->hasUserDeclaredDestructor()) { 4817 ++ASTContext::NumImplicitDestructors; 4818 4819 // If we have a dynamic class, then the destructor may be virtual, so we 4820 // have to declare the destructor immediately. This ensures that, e.g., it 4821 // shows up in the right place in the vtable and that we diagnose problems 4822 // with the implicit exception specification. 4823 if (ClassDecl->isDynamicClass()) 4824 DeclareImplicitDestructor(ClassDecl); 4825 } 4826} 4827 4828void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4829 if (!D) 4830 return; 4831 4832 int NumParamList = D->getNumTemplateParameterLists(); 4833 for (int i = 0; i < NumParamList; i++) { 4834 TemplateParameterList* Params = D->getTemplateParameterList(i); 4835 for (TemplateParameterList::iterator Param = Params->begin(), 4836 ParamEnd = Params->end(); 4837 Param != ParamEnd; ++Param) { 4838 NamedDecl *Named = cast<NamedDecl>(*Param); 4839 if (Named->getDeclName()) { 4840 S->AddDecl(Named); 4841 IdResolver.AddDecl(Named); 4842 } 4843 } 4844 } 4845} 4846 4847void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4848 if (!D) 4849 return; 4850 4851 TemplateParameterList *Params = 0; 4852 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4853 Params = Template->getTemplateParameters(); 4854 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4855 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4856 Params = PartialSpec->getTemplateParameters(); 4857 else 4858 return; 4859 4860 for (TemplateParameterList::iterator Param = Params->begin(), 4861 ParamEnd = Params->end(); 4862 Param != ParamEnd; ++Param) { 4863 NamedDecl *Named = cast<NamedDecl>(*Param); 4864 if (Named->getDeclName()) { 4865 S->AddDecl(Named); 4866 IdResolver.AddDecl(Named); 4867 } 4868 } 4869} 4870 4871void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4872 if (!RecordD) return; 4873 AdjustDeclIfTemplate(RecordD); 4874 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4875 PushDeclContext(S, Record); 4876} 4877 4878void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4879 if (!RecordD) return; 4880 PopDeclContext(); 4881} 4882 4883/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4884/// parsing a top-level (non-nested) C++ class, and we are now 4885/// parsing those parts of the given Method declaration that could 4886/// not be parsed earlier (C++ [class.mem]p2), such as default 4887/// arguments. This action should enter the scope of the given 4888/// Method declaration as if we had just parsed the qualified method 4889/// name. However, it should not bring the parameters into scope; 4890/// that will be performed by ActOnDelayedCXXMethodParameter. 4891void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4892} 4893 4894/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4895/// C++ method declaration. We're (re-)introducing the given 4896/// function parameter into scope for use in parsing later parts of 4897/// the method declaration. For example, we could see an 4898/// ActOnParamDefaultArgument event for this parameter. 4899void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4900 if (!ParamD) 4901 return; 4902 4903 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4904 4905 // If this parameter has an unparsed default argument, clear it out 4906 // to make way for the parsed default argument. 4907 if (Param->hasUnparsedDefaultArg()) 4908 Param->setDefaultArg(0); 4909 4910 S->AddDecl(Param); 4911 if (Param->getDeclName()) 4912 IdResolver.AddDecl(Param); 4913} 4914 4915/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4916/// processing the delayed method declaration for Method. The method 4917/// declaration is now considered finished. There may be a separate 4918/// ActOnStartOfFunctionDef action later (not necessarily 4919/// immediately!) for this method, if it was also defined inside the 4920/// class body. 4921void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4922 if (!MethodD) 4923 return; 4924 4925 AdjustDeclIfTemplate(MethodD); 4926 4927 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4928 4929 // Now that we have our default arguments, check the constructor 4930 // again. It could produce additional diagnostics or affect whether 4931 // the class has implicitly-declared destructors, among other 4932 // things. 4933 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4934 CheckConstructor(Constructor); 4935 4936 // Check the default arguments, which we may have added. 4937 if (!Method->isInvalidDecl()) 4938 CheckCXXDefaultArguments(Method); 4939} 4940 4941/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4942/// the well-formedness of the constructor declarator @p D with type @p 4943/// R. If there are any errors in the declarator, this routine will 4944/// emit diagnostics and set the invalid bit to true. In any case, the type 4945/// will be updated to reflect a well-formed type for the constructor and 4946/// returned. 4947QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4948 StorageClass &SC) { 4949 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4950 4951 // C++ [class.ctor]p3: 4952 // A constructor shall not be virtual (10.3) or static (9.4). A 4953 // constructor can be invoked for a const, volatile or const 4954 // volatile object. A constructor shall not be declared const, 4955 // volatile, or const volatile (9.3.2). 4956 if (isVirtual) { 4957 if (!D.isInvalidType()) 4958 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4959 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4960 << SourceRange(D.getIdentifierLoc()); 4961 D.setInvalidType(); 4962 } 4963 if (SC == SC_Static) { 4964 if (!D.isInvalidType()) 4965 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4966 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4967 << SourceRange(D.getIdentifierLoc()); 4968 D.setInvalidType(); 4969 SC = SC_None; 4970 } 4971 4972 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4973 if (FTI.TypeQuals != 0) { 4974 if (FTI.TypeQuals & Qualifiers::Const) 4975 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4976 << "const" << SourceRange(D.getIdentifierLoc()); 4977 if (FTI.TypeQuals & Qualifiers::Volatile) 4978 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4979 << "volatile" << SourceRange(D.getIdentifierLoc()); 4980 if (FTI.TypeQuals & Qualifiers::Restrict) 4981 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4982 << "restrict" << SourceRange(D.getIdentifierLoc()); 4983 D.setInvalidType(); 4984 } 4985 4986 // C++0x [class.ctor]p4: 4987 // A constructor shall not be declared with a ref-qualifier. 4988 if (FTI.hasRefQualifier()) { 4989 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4990 << FTI.RefQualifierIsLValueRef 4991 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4992 D.setInvalidType(); 4993 } 4994 4995 // Rebuild the function type "R" without any type qualifiers (in 4996 // case any of the errors above fired) and with "void" as the 4997 // return type, since constructors don't have return types. 4998 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4999 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5000 return R; 5001 5002 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5003 EPI.TypeQuals = 0; 5004 EPI.RefQualifier = RQ_None; 5005 5006 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5007 Proto->getNumArgs(), EPI); 5008} 5009 5010/// CheckConstructor - Checks a fully-formed constructor for 5011/// well-formedness, issuing any diagnostics required. Returns true if 5012/// the constructor declarator is invalid. 5013void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5014 CXXRecordDecl *ClassDecl 5015 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5016 if (!ClassDecl) 5017 return Constructor->setInvalidDecl(); 5018 5019 // C++ [class.copy]p3: 5020 // A declaration of a constructor for a class X is ill-formed if 5021 // its first parameter is of type (optionally cv-qualified) X and 5022 // either there are no other parameters or else all other 5023 // parameters have default arguments. 5024 if (!Constructor->isInvalidDecl() && 5025 ((Constructor->getNumParams() == 1) || 5026 (Constructor->getNumParams() > 1 && 5027 Constructor->getParamDecl(1)->hasDefaultArg())) && 5028 Constructor->getTemplateSpecializationKind() 5029 != TSK_ImplicitInstantiation) { 5030 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5031 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5032 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5033 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5034 const char *ConstRef 5035 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5036 : " const &"; 5037 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5038 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5039 5040 // FIXME: Rather that making the constructor invalid, we should endeavor 5041 // to fix the type. 5042 Constructor->setInvalidDecl(); 5043 } 5044 } 5045} 5046 5047/// CheckDestructor - Checks a fully-formed destructor definition for 5048/// well-formedness, issuing any diagnostics required. Returns true 5049/// on error. 5050bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5051 CXXRecordDecl *RD = Destructor->getParent(); 5052 5053 if (Destructor->isVirtual()) { 5054 SourceLocation Loc; 5055 5056 if (!Destructor->isImplicit()) 5057 Loc = Destructor->getLocation(); 5058 else 5059 Loc = RD->getLocation(); 5060 5061 // If we have a virtual destructor, look up the deallocation function 5062 FunctionDecl *OperatorDelete = 0; 5063 DeclarationName Name = 5064 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5065 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5066 return true; 5067 5068 MarkFunctionReferenced(Loc, OperatorDelete); 5069 5070 Destructor->setOperatorDelete(OperatorDelete); 5071 } 5072 5073 return false; 5074} 5075 5076static inline bool 5077FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5078 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5079 FTI.ArgInfo[0].Param && 5080 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5081} 5082 5083/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5084/// the well-formednes of the destructor declarator @p D with type @p 5085/// R. If there are any errors in the declarator, this routine will 5086/// emit diagnostics and set the declarator to invalid. Even if this happens, 5087/// will be updated to reflect a well-formed type for the destructor and 5088/// returned. 5089QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5090 StorageClass& SC) { 5091 // C++ [class.dtor]p1: 5092 // [...] A typedef-name that names a class is a class-name 5093 // (7.1.3); however, a typedef-name that names a class shall not 5094 // be used as the identifier in the declarator for a destructor 5095 // declaration. 5096 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5097 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5098 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5099 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5100 else if (const TemplateSpecializationType *TST = 5101 DeclaratorType->getAs<TemplateSpecializationType>()) 5102 if (TST->isTypeAlias()) 5103 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5104 << DeclaratorType << 1; 5105 5106 // C++ [class.dtor]p2: 5107 // A destructor is used to destroy objects of its class type. A 5108 // destructor takes no parameters, and no return type can be 5109 // specified for it (not even void). The address of a destructor 5110 // shall not be taken. A destructor shall not be static. A 5111 // destructor can be invoked for a const, volatile or const 5112 // volatile object. A destructor shall not be declared const, 5113 // volatile or const volatile (9.3.2). 5114 if (SC == SC_Static) { 5115 if (!D.isInvalidType()) 5116 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5117 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5118 << SourceRange(D.getIdentifierLoc()) 5119 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5120 5121 SC = SC_None; 5122 } 5123 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5124 // Destructors don't have return types, but the parser will 5125 // happily parse something like: 5126 // 5127 // class X { 5128 // float ~X(); 5129 // }; 5130 // 5131 // The return type will be eliminated later. 5132 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5133 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5134 << SourceRange(D.getIdentifierLoc()); 5135 } 5136 5137 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5138 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5139 if (FTI.TypeQuals & Qualifiers::Const) 5140 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5141 << "const" << SourceRange(D.getIdentifierLoc()); 5142 if (FTI.TypeQuals & Qualifiers::Volatile) 5143 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5144 << "volatile" << SourceRange(D.getIdentifierLoc()); 5145 if (FTI.TypeQuals & Qualifiers::Restrict) 5146 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5147 << "restrict" << SourceRange(D.getIdentifierLoc()); 5148 D.setInvalidType(); 5149 } 5150 5151 // C++0x [class.dtor]p2: 5152 // A destructor shall not be declared with a ref-qualifier. 5153 if (FTI.hasRefQualifier()) { 5154 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5155 << FTI.RefQualifierIsLValueRef 5156 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5157 D.setInvalidType(); 5158 } 5159 5160 // Make sure we don't have any parameters. 5161 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5162 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5163 5164 // Delete the parameters. 5165 FTI.freeArgs(); 5166 D.setInvalidType(); 5167 } 5168 5169 // Make sure the destructor isn't variadic. 5170 if (FTI.isVariadic) { 5171 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5172 D.setInvalidType(); 5173 } 5174 5175 // Rebuild the function type "R" without any type qualifiers or 5176 // parameters (in case any of the errors above fired) and with 5177 // "void" as the return type, since destructors don't have return 5178 // types. 5179 if (!D.isInvalidType()) 5180 return R; 5181 5182 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5183 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5184 EPI.Variadic = false; 5185 EPI.TypeQuals = 0; 5186 EPI.RefQualifier = RQ_None; 5187 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5188} 5189 5190/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5191/// well-formednes of the conversion function declarator @p D with 5192/// type @p R. If there are any errors in the declarator, this routine 5193/// will emit diagnostics and return true. Otherwise, it will return 5194/// false. Either way, the type @p R will be updated to reflect a 5195/// well-formed type for the conversion operator. 5196void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5197 StorageClass& SC) { 5198 // C++ [class.conv.fct]p1: 5199 // Neither parameter types nor return type can be specified. The 5200 // type of a conversion function (8.3.5) is "function taking no 5201 // parameter returning conversion-type-id." 5202 if (SC == SC_Static) { 5203 if (!D.isInvalidType()) 5204 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5205 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5206 << SourceRange(D.getIdentifierLoc()); 5207 D.setInvalidType(); 5208 SC = SC_None; 5209 } 5210 5211 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5212 5213 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5214 // Conversion functions don't have return types, but the parser will 5215 // happily parse something like: 5216 // 5217 // class X { 5218 // float operator bool(); 5219 // }; 5220 // 5221 // The return type will be changed later anyway. 5222 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5223 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5224 << SourceRange(D.getIdentifierLoc()); 5225 D.setInvalidType(); 5226 } 5227 5228 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5229 5230 // Make sure we don't have any parameters. 5231 if (Proto->getNumArgs() > 0) { 5232 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5233 5234 // Delete the parameters. 5235 D.getFunctionTypeInfo().freeArgs(); 5236 D.setInvalidType(); 5237 } else if (Proto->isVariadic()) { 5238 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5239 D.setInvalidType(); 5240 } 5241 5242 // Diagnose "&operator bool()" and other such nonsense. This 5243 // is actually a gcc extension which we don't support. 5244 if (Proto->getResultType() != ConvType) { 5245 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5246 << Proto->getResultType(); 5247 D.setInvalidType(); 5248 ConvType = Proto->getResultType(); 5249 } 5250 5251 // C++ [class.conv.fct]p4: 5252 // The conversion-type-id shall not represent a function type nor 5253 // an array type. 5254 if (ConvType->isArrayType()) { 5255 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5256 ConvType = Context.getPointerType(ConvType); 5257 D.setInvalidType(); 5258 } else if (ConvType->isFunctionType()) { 5259 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5260 ConvType = Context.getPointerType(ConvType); 5261 D.setInvalidType(); 5262 } 5263 5264 // Rebuild the function type "R" without any parameters (in case any 5265 // of the errors above fired) and with the conversion type as the 5266 // return type. 5267 if (D.isInvalidType()) 5268 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5269 5270 // C++0x explicit conversion operators. 5271 if (D.getDeclSpec().isExplicitSpecified()) 5272 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5273 getLangOptions().CPlusPlus0x ? 5274 diag::warn_cxx98_compat_explicit_conversion_functions : 5275 diag::ext_explicit_conversion_functions) 5276 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5277} 5278 5279/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5280/// the declaration of the given C++ conversion function. This routine 5281/// is responsible for recording the conversion function in the C++ 5282/// class, if possible. 5283Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5284 assert(Conversion && "Expected to receive a conversion function declaration"); 5285 5286 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5287 5288 // Make sure we aren't redeclaring the conversion function. 5289 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5290 5291 // C++ [class.conv.fct]p1: 5292 // [...] A conversion function is never used to convert a 5293 // (possibly cv-qualified) object to the (possibly cv-qualified) 5294 // same object type (or a reference to it), to a (possibly 5295 // cv-qualified) base class of that type (or a reference to it), 5296 // or to (possibly cv-qualified) void. 5297 // FIXME: Suppress this warning if the conversion function ends up being a 5298 // virtual function that overrides a virtual function in a base class. 5299 QualType ClassType 5300 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5301 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5302 ConvType = ConvTypeRef->getPointeeType(); 5303 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5304 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5305 /* Suppress diagnostics for instantiations. */; 5306 else if (ConvType->isRecordType()) { 5307 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5308 if (ConvType == ClassType) 5309 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5310 << ClassType; 5311 else if (IsDerivedFrom(ClassType, ConvType)) 5312 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5313 << ClassType << ConvType; 5314 } else if (ConvType->isVoidType()) { 5315 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5316 << ClassType << ConvType; 5317 } 5318 5319 if (FunctionTemplateDecl *ConversionTemplate 5320 = Conversion->getDescribedFunctionTemplate()) 5321 return ConversionTemplate; 5322 5323 return Conversion; 5324} 5325 5326//===----------------------------------------------------------------------===// 5327// Namespace Handling 5328//===----------------------------------------------------------------------===// 5329 5330 5331 5332/// ActOnStartNamespaceDef - This is called at the start of a namespace 5333/// definition. 5334Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5335 SourceLocation InlineLoc, 5336 SourceLocation NamespaceLoc, 5337 SourceLocation IdentLoc, 5338 IdentifierInfo *II, 5339 SourceLocation LBrace, 5340 AttributeList *AttrList) { 5341 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5342 // For anonymous namespace, take the location of the left brace. 5343 SourceLocation Loc = II ? IdentLoc : LBrace; 5344 bool IsInline = InlineLoc.isValid(); 5345 bool IsInvalid = false; 5346 bool IsStd = false; 5347 bool AddToKnown = false; 5348 Scope *DeclRegionScope = NamespcScope->getParent(); 5349 5350 NamespaceDecl *PrevNS = 0; 5351 if (II) { 5352 // C++ [namespace.def]p2: 5353 // The identifier in an original-namespace-definition shall not 5354 // have been previously defined in the declarative region in 5355 // which the original-namespace-definition appears. The 5356 // identifier in an original-namespace-definition is the name of 5357 // the namespace. Subsequently in that declarative region, it is 5358 // treated as an original-namespace-name. 5359 // 5360 // Since namespace names are unique in their scope, and we don't 5361 // look through using directives, just look for any ordinary names. 5362 5363 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5364 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5365 Decl::IDNS_Namespace; 5366 NamedDecl *PrevDecl = 0; 5367 for (DeclContext::lookup_result R 5368 = CurContext->getRedeclContext()->lookup(II); 5369 R.first != R.second; ++R.first) { 5370 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5371 PrevDecl = *R.first; 5372 break; 5373 } 5374 } 5375 5376 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5377 5378 if (PrevNS) { 5379 // This is an extended namespace definition. 5380 if (IsInline != PrevNS->isInline()) { 5381 // inline-ness must match 5382 if (PrevNS->isInline()) { 5383 // The user probably just forgot the 'inline', so suggest that it 5384 // be added back. 5385 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5386 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5387 } else { 5388 Diag(Loc, diag::err_inline_namespace_mismatch) 5389 << IsInline; 5390 } 5391 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5392 5393 IsInline = PrevNS->isInline(); 5394 } 5395 } else if (PrevDecl) { 5396 // This is an invalid name redefinition. 5397 Diag(Loc, diag::err_redefinition_different_kind) 5398 << II; 5399 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5400 IsInvalid = true; 5401 // Continue on to push Namespc as current DeclContext and return it. 5402 } else if (II->isStr("std") && 5403 CurContext->getRedeclContext()->isTranslationUnit()) { 5404 // This is the first "real" definition of the namespace "std", so update 5405 // our cache of the "std" namespace to point at this definition. 5406 PrevNS = getStdNamespace(); 5407 IsStd = true; 5408 AddToKnown = !IsInline; 5409 } else { 5410 // We've seen this namespace for the first time. 5411 AddToKnown = !IsInline; 5412 } 5413 } else { 5414 // Anonymous namespaces. 5415 5416 // Determine whether the parent already has an anonymous namespace. 5417 DeclContext *Parent = CurContext->getRedeclContext(); 5418 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5419 PrevNS = TU->getAnonymousNamespace(); 5420 } else { 5421 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5422 PrevNS = ND->getAnonymousNamespace(); 5423 } 5424 5425 if (PrevNS && IsInline != PrevNS->isInline()) { 5426 // inline-ness must match 5427 Diag(Loc, diag::err_inline_namespace_mismatch) 5428 << IsInline; 5429 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5430 5431 // Recover by ignoring the new namespace's inline status. 5432 IsInline = PrevNS->isInline(); 5433 } 5434 } 5435 5436 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5437 StartLoc, Loc, II, PrevNS); 5438 if (IsInvalid) 5439 Namespc->setInvalidDecl(); 5440 5441 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5442 5443 // FIXME: Should we be merging attributes? 5444 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5445 PushNamespaceVisibilityAttr(Attr, Loc); 5446 5447 if (IsStd) 5448 StdNamespace = Namespc; 5449 if (AddToKnown) 5450 KnownNamespaces[Namespc] = false; 5451 5452 if (II) { 5453 PushOnScopeChains(Namespc, DeclRegionScope); 5454 } else { 5455 // Link the anonymous namespace into its parent. 5456 DeclContext *Parent = CurContext->getRedeclContext(); 5457 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5458 TU->setAnonymousNamespace(Namespc); 5459 } else { 5460 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5461 } 5462 5463 CurContext->addDecl(Namespc); 5464 5465 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5466 // behaves as if it were replaced by 5467 // namespace unique { /* empty body */ } 5468 // using namespace unique; 5469 // namespace unique { namespace-body } 5470 // where all occurrences of 'unique' in a translation unit are 5471 // replaced by the same identifier and this identifier differs 5472 // from all other identifiers in the entire program. 5473 5474 // We just create the namespace with an empty name and then add an 5475 // implicit using declaration, just like the standard suggests. 5476 // 5477 // CodeGen enforces the "universally unique" aspect by giving all 5478 // declarations semantically contained within an anonymous 5479 // namespace internal linkage. 5480 5481 if (!PrevNS) { 5482 UsingDirectiveDecl* UD 5483 = UsingDirectiveDecl::Create(Context, CurContext, 5484 /* 'using' */ LBrace, 5485 /* 'namespace' */ SourceLocation(), 5486 /* qualifier */ NestedNameSpecifierLoc(), 5487 /* identifier */ SourceLocation(), 5488 Namespc, 5489 /* Ancestor */ CurContext); 5490 UD->setImplicit(); 5491 CurContext->addDecl(UD); 5492 } 5493 } 5494 5495 // Although we could have an invalid decl (i.e. the namespace name is a 5496 // redefinition), push it as current DeclContext and try to continue parsing. 5497 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5498 // for the namespace has the declarations that showed up in that particular 5499 // namespace definition. 5500 PushDeclContext(NamespcScope, Namespc); 5501 return Namespc; 5502} 5503 5504/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5505/// is a namespace alias, returns the namespace it points to. 5506static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5507 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5508 return AD->getNamespace(); 5509 return dyn_cast_or_null<NamespaceDecl>(D); 5510} 5511 5512/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5513/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5514void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5515 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5516 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5517 Namespc->setRBraceLoc(RBrace); 5518 PopDeclContext(); 5519 if (Namespc->hasAttr<VisibilityAttr>()) 5520 PopPragmaVisibility(true, RBrace); 5521} 5522 5523CXXRecordDecl *Sema::getStdBadAlloc() const { 5524 return cast_or_null<CXXRecordDecl>( 5525 StdBadAlloc.get(Context.getExternalSource())); 5526} 5527 5528NamespaceDecl *Sema::getStdNamespace() const { 5529 return cast_or_null<NamespaceDecl>( 5530 StdNamespace.get(Context.getExternalSource())); 5531} 5532 5533/// \brief Retrieve the special "std" namespace, which may require us to 5534/// implicitly define the namespace. 5535NamespaceDecl *Sema::getOrCreateStdNamespace() { 5536 if (!StdNamespace) { 5537 // The "std" namespace has not yet been defined, so build one implicitly. 5538 StdNamespace = NamespaceDecl::Create(Context, 5539 Context.getTranslationUnitDecl(), 5540 /*Inline=*/false, 5541 SourceLocation(), SourceLocation(), 5542 &PP.getIdentifierTable().get("std"), 5543 /*PrevDecl=*/0); 5544 getStdNamespace()->setImplicit(true); 5545 } 5546 5547 return getStdNamespace(); 5548} 5549 5550bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5551 assert(getLangOptions().CPlusPlus && 5552 "Looking for std::initializer_list outside of C++."); 5553 5554 // We're looking for implicit instantiations of 5555 // template <typename E> class std::initializer_list. 5556 5557 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5558 return false; 5559 5560 ClassTemplateDecl *Template = 0; 5561 const TemplateArgument *Arguments = 0; 5562 5563 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5564 5565 ClassTemplateSpecializationDecl *Specialization = 5566 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5567 if (!Specialization) 5568 return false; 5569 5570 Template = Specialization->getSpecializedTemplate(); 5571 Arguments = Specialization->getTemplateArgs().data(); 5572 } else if (const TemplateSpecializationType *TST = 5573 Ty->getAs<TemplateSpecializationType>()) { 5574 Template = dyn_cast_or_null<ClassTemplateDecl>( 5575 TST->getTemplateName().getAsTemplateDecl()); 5576 Arguments = TST->getArgs(); 5577 } 5578 if (!Template) 5579 return false; 5580 5581 if (!StdInitializerList) { 5582 // Haven't recognized std::initializer_list yet, maybe this is it. 5583 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5584 if (TemplateClass->getIdentifier() != 5585 &PP.getIdentifierTable().get("initializer_list") || 5586 !getStdNamespace()->InEnclosingNamespaceSetOf( 5587 TemplateClass->getDeclContext())) 5588 return false; 5589 // This is a template called std::initializer_list, but is it the right 5590 // template? 5591 TemplateParameterList *Params = Template->getTemplateParameters(); 5592 if (Params->getMinRequiredArguments() != 1) 5593 return false; 5594 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5595 return false; 5596 5597 // It's the right template. 5598 StdInitializerList = Template; 5599 } 5600 5601 if (Template != StdInitializerList) 5602 return false; 5603 5604 // This is an instance of std::initializer_list. Find the argument type. 5605 if (Element) 5606 *Element = Arguments[0].getAsType(); 5607 return true; 5608} 5609 5610static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5611 NamespaceDecl *Std = S.getStdNamespace(); 5612 if (!Std) { 5613 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5614 return 0; 5615 } 5616 5617 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5618 Loc, Sema::LookupOrdinaryName); 5619 if (!S.LookupQualifiedName(Result, Std)) { 5620 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5621 return 0; 5622 } 5623 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5624 if (!Template) { 5625 Result.suppressDiagnostics(); 5626 // We found something weird. Complain about the first thing we found. 5627 NamedDecl *Found = *Result.begin(); 5628 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5629 return 0; 5630 } 5631 5632 // We found some template called std::initializer_list. Now verify that it's 5633 // correct. 5634 TemplateParameterList *Params = Template->getTemplateParameters(); 5635 if (Params->getMinRequiredArguments() != 1 || 5636 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5637 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5638 return 0; 5639 } 5640 5641 return Template; 5642} 5643 5644QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5645 if (!StdInitializerList) { 5646 StdInitializerList = LookupStdInitializerList(*this, Loc); 5647 if (!StdInitializerList) 5648 return QualType(); 5649 } 5650 5651 TemplateArgumentListInfo Args(Loc, Loc); 5652 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5653 Context.getTrivialTypeSourceInfo(Element, 5654 Loc))); 5655 return Context.getCanonicalType( 5656 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5657} 5658 5659bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5660 // C++ [dcl.init.list]p2: 5661 // A constructor is an initializer-list constructor if its first parameter 5662 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5663 // std::initializer_list<E> for some type E, and either there are no other 5664 // parameters or else all other parameters have default arguments. 5665 if (Ctor->getNumParams() < 1 || 5666 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5667 return false; 5668 5669 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5670 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5671 ArgType = RT->getPointeeType().getUnqualifiedType(); 5672 5673 return isStdInitializerList(ArgType, 0); 5674} 5675 5676/// \brief Determine whether a using statement is in a context where it will be 5677/// apply in all contexts. 5678static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5679 switch (CurContext->getDeclKind()) { 5680 case Decl::TranslationUnit: 5681 return true; 5682 case Decl::LinkageSpec: 5683 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5684 default: 5685 return false; 5686 } 5687} 5688 5689namespace { 5690 5691// Callback to only accept typo corrections that are namespaces. 5692class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5693 public: 5694 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5695 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5696 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5697 } 5698 return false; 5699 } 5700}; 5701 5702} 5703 5704static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5705 CXXScopeSpec &SS, 5706 SourceLocation IdentLoc, 5707 IdentifierInfo *Ident) { 5708 NamespaceValidatorCCC Validator; 5709 R.clear(); 5710 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5711 R.getLookupKind(), Sc, &SS, 5712 Validator)) { 5713 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5714 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5715 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5716 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5717 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5718 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5719 else 5720 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5721 << Ident << CorrectedQuotedStr 5722 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5723 5724 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5725 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5726 5727 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5728 R.addDecl(Corrected.getCorrectionDecl()); 5729 return true; 5730 } 5731 return false; 5732} 5733 5734Decl *Sema::ActOnUsingDirective(Scope *S, 5735 SourceLocation UsingLoc, 5736 SourceLocation NamespcLoc, 5737 CXXScopeSpec &SS, 5738 SourceLocation IdentLoc, 5739 IdentifierInfo *NamespcName, 5740 AttributeList *AttrList) { 5741 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5742 assert(NamespcName && "Invalid NamespcName."); 5743 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5744 5745 // This can only happen along a recovery path. 5746 while (S->getFlags() & Scope::TemplateParamScope) 5747 S = S->getParent(); 5748 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5749 5750 UsingDirectiveDecl *UDir = 0; 5751 NestedNameSpecifier *Qualifier = 0; 5752 if (SS.isSet()) 5753 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5754 5755 // Lookup namespace name. 5756 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5757 LookupParsedName(R, S, &SS); 5758 if (R.isAmbiguous()) 5759 return 0; 5760 5761 if (R.empty()) { 5762 R.clear(); 5763 // Allow "using namespace std;" or "using namespace ::std;" even if 5764 // "std" hasn't been defined yet, for GCC compatibility. 5765 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5766 NamespcName->isStr("std")) { 5767 Diag(IdentLoc, diag::ext_using_undefined_std); 5768 R.addDecl(getOrCreateStdNamespace()); 5769 R.resolveKind(); 5770 } 5771 // Otherwise, attempt typo correction. 5772 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5773 } 5774 5775 if (!R.empty()) { 5776 NamedDecl *Named = R.getFoundDecl(); 5777 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5778 && "expected namespace decl"); 5779 // C++ [namespace.udir]p1: 5780 // A using-directive specifies that the names in the nominated 5781 // namespace can be used in the scope in which the 5782 // using-directive appears after the using-directive. During 5783 // unqualified name lookup (3.4.1), the names appear as if they 5784 // were declared in the nearest enclosing namespace which 5785 // contains both the using-directive and the nominated 5786 // namespace. [Note: in this context, "contains" means "contains 5787 // directly or indirectly". ] 5788 5789 // Find enclosing context containing both using-directive and 5790 // nominated namespace. 5791 NamespaceDecl *NS = getNamespaceDecl(Named); 5792 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5793 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5794 CommonAncestor = CommonAncestor->getParent(); 5795 5796 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5797 SS.getWithLocInContext(Context), 5798 IdentLoc, Named, CommonAncestor); 5799 5800 if (IsUsingDirectiveInToplevelContext(CurContext) && 5801 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5802 Diag(IdentLoc, diag::warn_using_directive_in_header); 5803 } 5804 5805 PushUsingDirective(S, UDir); 5806 } else { 5807 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5808 } 5809 5810 // FIXME: We ignore attributes for now. 5811 return UDir; 5812} 5813 5814void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5815 // If scope has associated entity, then using directive is at namespace 5816 // or translation unit scope. We add UsingDirectiveDecls, into 5817 // it's lookup structure. 5818 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5819 Ctx->addDecl(UDir); 5820 else 5821 // Otherwise it is block-sope. using-directives will affect lookup 5822 // only to the end of scope. 5823 S->PushUsingDirective(UDir); 5824} 5825 5826 5827Decl *Sema::ActOnUsingDeclaration(Scope *S, 5828 AccessSpecifier AS, 5829 bool HasUsingKeyword, 5830 SourceLocation UsingLoc, 5831 CXXScopeSpec &SS, 5832 UnqualifiedId &Name, 5833 AttributeList *AttrList, 5834 bool IsTypeName, 5835 SourceLocation TypenameLoc) { 5836 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5837 5838 switch (Name.getKind()) { 5839 case UnqualifiedId::IK_ImplicitSelfParam: 5840 case UnqualifiedId::IK_Identifier: 5841 case UnqualifiedId::IK_OperatorFunctionId: 5842 case UnqualifiedId::IK_LiteralOperatorId: 5843 case UnqualifiedId::IK_ConversionFunctionId: 5844 break; 5845 5846 case UnqualifiedId::IK_ConstructorName: 5847 case UnqualifiedId::IK_ConstructorTemplateId: 5848 // C++0x inherited constructors. 5849 Diag(Name.getSourceRange().getBegin(), 5850 getLangOptions().CPlusPlus0x ? 5851 diag::warn_cxx98_compat_using_decl_constructor : 5852 diag::err_using_decl_constructor) 5853 << SS.getRange(); 5854 5855 if (getLangOptions().CPlusPlus0x) break; 5856 5857 return 0; 5858 5859 case UnqualifiedId::IK_DestructorName: 5860 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5861 << SS.getRange(); 5862 return 0; 5863 5864 case UnqualifiedId::IK_TemplateId: 5865 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5866 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5867 return 0; 5868 } 5869 5870 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5871 DeclarationName TargetName = TargetNameInfo.getName(); 5872 if (!TargetName) 5873 return 0; 5874 5875 // Warn about using declarations. 5876 // TODO: store that the declaration was written without 'using' and 5877 // talk about access decls instead of using decls in the 5878 // diagnostics. 5879 if (!HasUsingKeyword) { 5880 UsingLoc = Name.getSourceRange().getBegin(); 5881 5882 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5883 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5884 } 5885 5886 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5887 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5888 return 0; 5889 5890 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5891 TargetNameInfo, AttrList, 5892 /* IsInstantiation */ false, 5893 IsTypeName, TypenameLoc); 5894 if (UD) 5895 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5896 5897 return UD; 5898} 5899 5900/// \brief Determine whether a using declaration considers the given 5901/// declarations as "equivalent", e.g., if they are redeclarations of 5902/// the same entity or are both typedefs of the same type. 5903static bool 5904IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5905 bool &SuppressRedeclaration) { 5906 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5907 SuppressRedeclaration = false; 5908 return true; 5909 } 5910 5911 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5912 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5913 SuppressRedeclaration = true; 5914 return Context.hasSameType(TD1->getUnderlyingType(), 5915 TD2->getUnderlyingType()); 5916 } 5917 5918 return false; 5919} 5920 5921 5922/// Determines whether to create a using shadow decl for a particular 5923/// decl, given the set of decls existing prior to this using lookup. 5924bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5925 const LookupResult &Previous) { 5926 // Diagnose finding a decl which is not from a base class of the 5927 // current class. We do this now because there are cases where this 5928 // function will silently decide not to build a shadow decl, which 5929 // will pre-empt further diagnostics. 5930 // 5931 // We don't need to do this in C++0x because we do the check once on 5932 // the qualifier. 5933 // 5934 // FIXME: diagnose the following if we care enough: 5935 // struct A { int foo; }; 5936 // struct B : A { using A::foo; }; 5937 // template <class T> struct C : A {}; 5938 // template <class T> struct D : C<T> { using B::foo; } // <--- 5939 // This is invalid (during instantiation) in C++03 because B::foo 5940 // resolves to the using decl in B, which is not a base class of D<T>. 5941 // We can't diagnose it immediately because C<T> is an unknown 5942 // specialization. The UsingShadowDecl in D<T> then points directly 5943 // to A::foo, which will look well-formed when we instantiate. 5944 // The right solution is to not collapse the shadow-decl chain. 5945 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5946 DeclContext *OrigDC = Orig->getDeclContext(); 5947 5948 // Handle enums and anonymous structs. 5949 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5950 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5951 while (OrigRec->isAnonymousStructOrUnion()) 5952 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5953 5954 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5955 if (OrigDC == CurContext) { 5956 Diag(Using->getLocation(), 5957 diag::err_using_decl_nested_name_specifier_is_current_class) 5958 << Using->getQualifierLoc().getSourceRange(); 5959 Diag(Orig->getLocation(), diag::note_using_decl_target); 5960 return true; 5961 } 5962 5963 Diag(Using->getQualifierLoc().getBeginLoc(), 5964 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5965 << Using->getQualifier() 5966 << cast<CXXRecordDecl>(CurContext) 5967 << Using->getQualifierLoc().getSourceRange(); 5968 Diag(Orig->getLocation(), diag::note_using_decl_target); 5969 return true; 5970 } 5971 } 5972 5973 if (Previous.empty()) return false; 5974 5975 NamedDecl *Target = Orig; 5976 if (isa<UsingShadowDecl>(Target)) 5977 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5978 5979 // If the target happens to be one of the previous declarations, we 5980 // don't have a conflict. 5981 // 5982 // FIXME: but we might be increasing its access, in which case we 5983 // should redeclare it. 5984 NamedDecl *NonTag = 0, *Tag = 0; 5985 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5986 I != E; ++I) { 5987 NamedDecl *D = (*I)->getUnderlyingDecl(); 5988 bool Result; 5989 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5990 return Result; 5991 5992 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5993 } 5994 5995 if (Target->isFunctionOrFunctionTemplate()) { 5996 FunctionDecl *FD; 5997 if (isa<FunctionTemplateDecl>(Target)) 5998 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5999 else 6000 FD = cast<FunctionDecl>(Target); 6001 6002 NamedDecl *OldDecl = 0; 6003 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6004 case Ovl_Overload: 6005 return false; 6006 6007 case Ovl_NonFunction: 6008 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6009 break; 6010 6011 // We found a decl with the exact signature. 6012 case Ovl_Match: 6013 // If we're in a record, we want to hide the target, so we 6014 // return true (without a diagnostic) to tell the caller not to 6015 // build a shadow decl. 6016 if (CurContext->isRecord()) 6017 return true; 6018 6019 // If we're not in a record, this is an error. 6020 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6021 break; 6022 } 6023 6024 Diag(Target->getLocation(), diag::note_using_decl_target); 6025 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6026 return true; 6027 } 6028 6029 // Target is not a function. 6030 6031 if (isa<TagDecl>(Target)) { 6032 // No conflict between a tag and a non-tag. 6033 if (!Tag) return false; 6034 6035 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6036 Diag(Target->getLocation(), diag::note_using_decl_target); 6037 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6038 return true; 6039 } 6040 6041 // No conflict between a tag and a non-tag. 6042 if (!NonTag) return false; 6043 6044 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6045 Diag(Target->getLocation(), diag::note_using_decl_target); 6046 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6047 return true; 6048} 6049 6050/// Builds a shadow declaration corresponding to a 'using' declaration. 6051UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6052 UsingDecl *UD, 6053 NamedDecl *Orig) { 6054 6055 // If we resolved to another shadow declaration, just coalesce them. 6056 NamedDecl *Target = Orig; 6057 if (isa<UsingShadowDecl>(Target)) { 6058 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6059 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6060 } 6061 6062 UsingShadowDecl *Shadow 6063 = UsingShadowDecl::Create(Context, CurContext, 6064 UD->getLocation(), UD, Target); 6065 UD->addShadowDecl(Shadow); 6066 6067 Shadow->setAccess(UD->getAccess()); 6068 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6069 Shadow->setInvalidDecl(); 6070 6071 if (S) 6072 PushOnScopeChains(Shadow, S); 6073 else 6074 CurContext->addDecl(Shadow); 6075 6076 6077 return Shadow; 6078} 6079 6080/// Hides a using shadow declaration. This is required by the current 6081/// using-decl implementation when a resolvable using declaration in a 6082/// class is followed by a declaration which would hide or override 6083/// one or more of the using decl's targets; for example: 6084/// 6085/// struct Base { void foo(int); }; 6086/// struct Derived : Base { 6087/// using Base::foo; 6088/// void foo(int); 6089/// }; 6090/// 6091/// The governing language is C++03 [namespace.udecl]p12: 6092/// 6093/// When a using-declaration brings names from a base class into a 6094/// derived class scope, member functions in the derived class 6095/// override and/or hide member functions with the same name and 6096/// parameter types in a base class (rather than conflicting). 6097/// 6098/// There are two ways to implement this: 6099/// (1) optimistically create shadow decls when they're not hidden 6100/// by existing declarations, or 6101/// (2) don't create any shadow decls (or at least don't make them 6102/// visible) until we've fully parsed/instantiated the class. 6103/// The problem with (1) is that we might have to retroactively remove 6104/// a shadow decl, which requires several O(n) operations because the 6105/// decl structures are (very reasonably) not designed for removal. 6106/// (2) avoids this but is very fiddly and phase-dependent. 6107void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6108 if (Shadow->getDeclName().getNameKind() == 6109 DeclarationName::CXXConversionFunctionName) 6110 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6111 6112 // Remove it from the DeclContext... 6113 Shadow->getDeclContext()->removeDecl(Shadow); 6114 6115 // ...and the scope, if applicable... 6116 if (S) { 6117 S->RemoveDecl(Shadow); 6118 IdResolver.RemoveDecl(Shadow); 6119 } 6120 6121 // ...and the using decl. 6122 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6123 6124 // TODO: complain somehow if Shadow was used. It shouldn't 6125 // be possible for this to happen, because...? 6126} 6127 6128/// Builds a using declaration. 6129/// 6130/// \param IsInstantiation - Whether this call arises from an 6131/// instantiation of an unresolved using declaration. We treat 6132/// the lookup differently for these declarations. 6133NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6134 SourceLocation UsingLoc, 6135 CXXScopeSpec &SS, 6136 const DeclarationNameInfo &NameInfo, 6137 AttributeList *AttrList, 6138 bool IsInstantiation, 6139 bool IsTypeName, 6140 SourceLocation TypenameLoc) { 6141 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6142 SourceLocation IdentLoc = NameInfo.getLoc(); 6143 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6144 6145 // FIXME: We ignore attributes for now. 6146 6147 if (SS.isEmpty()) { 6148 Diag(IdentLoc, diag::err_using_requires_qualname); 6149 return 0; 6150 } 6151 6152 // Do the redeclaration lookup in the current scope. 6153 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6154 ForRedeclaration); 6155 Previous.setHideTags(false); 6156 if (S) { 6157 LookupName(Previous, S); 6158 6159 // It is really dumb that we have to do this. 6160 LookupResult::Filter F = Previous.makeFilter(); 6161 while (F.hasNext()) { 6162 NamedDecl *D = F.next(); 6163 if (!isDeclInScope(D, CurContext, S)) 6164 F.erase(); 6165 } 6166 F.done(); 6167 } else { 6168 assert(IsInstantiation && "no scope in non-instantiation"); 6169 assert(CurContext->isRecord() && "scope not record in instantiation"); 6170 LookupQualifiedName(Previous, CurContext); 6171 } 6172 6173 // Check for invalid redeclarations. 6174 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6175 return 0; 6176 6177 // Check for bad qualifiers. 6178 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6179 return 0; 6180 6181 DeclContext *LookupContext = computeDeclContext(SS); 6182 NamedDecl *D; 6183 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6184 if (!LookupContext) { 6185 if (IsTypeName) { 6186 // FIXME: not all declaration name kinds are legal here 6187 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6188 UsingLoc, TypenameLoc, 6189 QualifierLoc, 6190 IdentLoc, NameInfo.getName()); 6191 } else { 6192 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6193 QualifierLoc, NameInfo); 6194 } 6195 } else { 6196 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6197 NameInfo, IsTypeName); 6198 } 6199 D->setAccess(AS); 6200 CurContext->addDecl(D); 6201 6202 if (!LookupContext) return D; 6203 UsingDecl *UD = cast<UsingDecl>(D); 6204 6205 if (RequireCompleteDeclContext(SS, LookupContext)) { 6206 UD->setInvalidDecl(); 6207 return UD; 6208 } 6209 6210 // Constructor inheriting using decls get special treatment. 6211 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6212 if (CheckInheritedConstructorUsingDecl(UD)) 6213 UD->setInvalidDecl(); 6214 return UD; 6215 } 6216 6217 // Otherwise, look up the target name. 6218 6219 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6220 6221 // Unlike most lookups, we don't always want to hide tag 6222 // declarations: tag names are visible through the using declaration 6223 // even if hidden by ordinary names, *except* in a dependent context 6224 // where it's important for the sanity of two-phase lookup. 6225 if (!IsInstantiation) 6226 R.setHideTags(false); 6227 6228 LookupQualifiedName(R, LookupContext); 6229 6230 if (R.empty()) { 6231 Diag(IdentLoc, diag::err_no_member) 6232 << NameInfo.getName() << LookupContext << SS.getRange(); 6233 UD->setInvalidDecl(); 6234 return UD; 6235 } 6236 6237 if (R.isAmbiguous()) { 6238 UD->setInvalidDecl(); 6239 return UD; 6240 } 6241 6242 if (IsTypeName) { 6243 // If we asked for a typename and got a non-type decl, error out. 6244 if (!R.getAsSingle<TypeDecl>()) { 6245 Diag(IdentLoc, diag::err_using_typename_non_type); 6246 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6247 Diag((*I)->getUnderlyingDecl()->getLocation(), 6248 diag::note_using_decl_target); 6249 UD->setInvalidDecl(); 6250 return UD; 6251 } 6252 } else { 6253 // If we asked for a non-typename and we got a type, error out, 6254 // but only if this is an instantiation of an unresolved using 6255 // decl. Otherwise just silently find the type name. 6256 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6257 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6258 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6259 UD->setInvalidDecl(); 6260 return UD; 6261 } 6262 } 6263 6264 // C++0x N2914 [namespace.udecl]p6: 6265 // A using-declaration shall not name a namespace. 6266 if (R.getAsSingle<NamespaceDecl>()) { 6267 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6268 << SS.getRange(); 6269 UD->setInvalidDecl(); 6270 return UD; 6271 } 6272 6273 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6274 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6275 BuildUsingShadowDecl(S, UD, *I); 6276 } 6277 6278 return UD; 6279} 6280 6281/// Additional checks for a using declaration referring to a constructor name. 6282bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6283 if (UD->isTypeName()) { 6284 // FIXME: Cannot specify typename when specifying constructor 6285 return true; 6286 } 6287 6288 const Type *SourceType = UD->getQualifier()->getAsType(); 6289 assert(SourceType && 6290 "Using decl naming constructor doesn't have type in scope spec."); 6291 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6292 6293 // Check whether the named type is a direct base class. 6294 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6295 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6296 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6297 BaseIt != BaseE; ++BaseIt) { 6298 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6299 if (CanonicalSourceType == BaseType) 6300 break; 6301 } 6302 6303 if (BaseIt == BaseE) { 6304 // Did not find SourceType in the bases. 6305 Diag(UD->getUsingLocation(), 6306 diag::err_using_decl_constructor_not_in_direct_base) 6307 << UD->getNameInfo().getSourceRange() 6308 << QualType(SourceType, 0) << TargetClass; 6309 return true; 6310 } 6311 6312 BaseIt->setInheritConstructors(); 6313 6314 return false; 6315} 6316 6317/// Checks that the given using declaration is not an invalid 6318/// redeclaration. Note that this is checking only for the using decl 6319/// itself, not for any ill-formedness among the UsingShadowDecls. 6320bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6321 bool isTypeName, 6322 const CXXScopeSpec &SS, 6323 SourceLocation NameLoc, 6324 const LookupResult &Prev) { 6325 // C++03 [namespace.udecl]p8: 6326 // C++0x [namespace.udecl]p10: 6327 // A using-declaration is a declaration and can therefore be used 6328 // repeatedly where (and only where) multiple declarations are 6329 // allowed. 6330 // 6331 // That's in non-member contexts. 6332 if (!CurContext->getRedeclContext()->isRecord()) 6333 return false; 6334 6335 NestedNameSpecifier *Qual 6336 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6337 6338 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6339 NamedDecl *D = *I; 6340 6341 bool DTypename; 6342 NestedNameSpecifier *DQual; 6343 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6344 DTypename = UD->isTypeName(); 6345 DQual = UD->getQualifier(); 6346 } else if (UnresolvedUsingValueDecl *UD 6347 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6348 DTypename = false; 6349 DQual = UD->getQualifier(); 6350 } else if (UnresolvedUsingTypenameDecl *UD 6351 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6352 DTypename = true; 6353 DQual = UD->getQualifier(); 6354 } else continue; 6355 6356 // using decls differ if one says 'typename' and the other doesn't. 6357 // FIXME: non-dependent using decls? 6358 if (isTypeName != DTypename) continue; 6359 6360 // using decls differ if they name different scopes (but note that 6361 // template instantiation can cause this check to trigger when it 6362 // didn't before instantiation). 6363 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6364 Context.getCanonicalNestedNameSpecifier(DQual)) 6365 continue; 6366 6367 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6368 Diag(D->getLocation(), diag::note_using_decl) << 1; 6369 return true; 6370 } 6371 6372 return false; 6373} 6374 6375 6376/// Checks that the given nested-name qualifier used in a using decl 6377/// in the current context is appropriately related to the current 6378/// scope. If an error is found, diagnoses it and returns true. 6379bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6380 const CXXScopeSpec &SS, 6381 SourceLocation NameLoc) { 6382 DeclContext *NamedContext = computeDeclContext(SS); 6383 6384 if (!CurContext->isRecord()) { 6385 // C++03 [namespace.udecl]p3: 6386 // C++0x [namespace.udecl]p8: 6387 // A using-declaration for a class member shall be a member-declaration. 6388 6389 // If we weren't able to compute a valid scope, it must be a 6390 // dependent class scope. 6391 if (!NamedContext || NamedContext->isRecord()) { 6392 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6393 << SS.getRange(); 6394 return true; 6395 } 6396 6397 // Otherwise, everything is known to be fine. 6398 return false; 6399 } 6400 6401 // The current scope is a record. 6402 6403 // If the named context is dependent, we can't decide much. 6404 if (!NamedContext) { 6405 // FIXME: in C++0x, we can diagnose if we can prove that the 6406 // nested-name-specifier does not refer to a base class, which is 6407 // still possible in some cases. 6408 6409 // Otherwise we have to conservatively report that things might be 6410 // okay. 6411 return false; 6412 } 6413 6414 if (!NamedContext->isRecord()) { 6415 // Ideally this would point at the last name in the specifier, 6416 // but we don't have that level of source info. 6417 Diag(SS.getRange().getBegin(), 6418 diag::err_using_decl_nested_name_specifier_is_not_class) 6419 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6420 return true; 6421 } 6422 6423 if (!NamedContext->isDependentContext() && 6424 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6425 return true; 6426 6427 if (getLangOptions().CPlusPlus0x) { 6428 // C++0x [namespace.udecl]p3: 6429 // In a using-declaration used as a member-declaration, the 6430 // nested-name-specifier shall name a base class of the class 6431 // being defined. 6432 6433 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6434 cast<CXXRecordDecl>(NamedContext))) { 6435 if (CurContext == NamedContext) { 6436 Diag(NameLoc, 6437 diag::err_using_decl_nested_name_specifier_is_current_class) 6438 << SS.getRange(); 6439 return true; 6440 } 6441 6442 Diag(SS.getRange().getBegin(), 6443 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6444 << (NestedNameSpecifier*) SS.getScopeRep() 6445 << cast<CXXRecordDecl>(CurContext) 6446 << SS.getRange(); 6447 return true; 6448 } 6449 6450 return false; 6451 } 6452 6453 // C++03 [namespace.udecl]p4: 6454 // A using-declaration used as a member-declaration shall refer 6455 // to a member of a base class of the class being defined [etc.]. 6456 6457 // Salient point: SS doesn't have to name a base class as long as 6458 // lookup only finds members from base classes. Therefore we can 6459 // diagnose here only if we can prove that that can't happen, 6460 // i.e. if the class hierarchies provably don't intersect. 6461 6462 // TODO: it would be nice if "definitely valid" results were cached 6463 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6464 // need to be repeated. 6465 6466 struct UserData { 6467 llvm::DenseSet<const CXXRecordDecl*> Bases; 6468 6469 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6470 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6471 Data->Bases.insert(Base); 6472 return true; 6473 } 6474 6475 bool hasDependentBases(const CXXRecordDecl *Class) { 6476 return !Class->forallBases(collect, this); 6477 } 6478 6479 /// Returns true if the base is dependent or is one of the 6480 /// accumulated base classes. 6481 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6482 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6483 return !Data->Bases.count(Base); 6484 } 6485 6486 bool mightShareBases(const CXXRecordDecl *Class) { 6487 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6488 } 6489 }; 6490 6491 UserData Data; 6492 6493 // Returns false if we find a dependent base. 6494 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6495 return false; 6496 6497 // Returns false if the class has a dependent base or if it or one 6498 // of its bases is present in the base set of the current context. 6499 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6500 return false; 6501 6502 Diag(SS.getRange().getBegin(), 6503 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6504 << (NestedNameSpecifier*) SS.getScopeRep() 6505 << cast<CXXRecordDecl>(CurContext) 6506 << SS.getRange(); 6507 6508 return true; 6509} 6510 6511Decl *Sema::ActOnAliasDeclaration(Scope *S, 6512 AccessSpecifier AS, 6513 MultiTemplateParamsArg TemplateParamLists, 6514 SourceLocation UsingLoc, 6515 UnqualifiedId &Name, 6516 TypeResult Type) { 6517 // Skip up to the relevant declaration scope. 6518 while (S->getFlags() & Scope::TemplateParamScope) 6519 S = S->getParent(); 6520 assert((S->getFlags() & Scope::DeclScope) && 6521 "got alias-declaration outside of declaration scope"); 6522 6523 if (Type.isInvalid()) 6524 return 0; 6525 6526 bool Invalid = false; 6527 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6528 TypeSourceInfo *TInfo = 0; 6529 GetTypeFromParser(Type.get(), &TInfo); 6530 6531 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6532 return 0; 6533 6534 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6535 UPPC_DeclarationType)) { 6536 Invalid = true; 6537 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6538 TInfo->getTypeLoc().getBeginLoc()); 6539 } 6540 6541 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6542 LookupName(Previous, S); 6543 6544 // Warn about shadowing the name of a template parameter. 6545 if (Previous.isSingleResult() && 6546 Previous.getFoundDecl()->isTemplateParameter()) { 6547 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6548 Previous.clear(); 6549 } 6550 6551 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6552 "name in alias declaration must be an identifier"); 6553 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6554 Name.StartLocation, 6555 Name.Identifier, TInfo); 6556 6557 NewTD->setAccess(AS); 6558 6559 if (Invalid) 6560 NewTD->setInvalidDecl(); 6561 6562 CheckTypedefForVariablyModifiedType(S, NewTD); 6563 Invalid |= NewTD->isInvalidDecl(); 6564 6565 bool Redeclaration = false; 6566 6567 NamedDecl *NewND; 6568 if (TemplateParamLists.size()) { 6569 TypeAliasTemplateDecl *OldDecl = 0; 6570 TemplateParameterList *OldTemplateParams = 0; 6571 6572 if (TemplateParamLists.size() != 1) { 6573 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6574 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6575 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6576 } 6577 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6578 6579 // Only consider previous declarations in the same scope. 6580 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6581 /*ExplicitInstantiationOrSpecialization*/false); 6582 if (!Previous.empty()) { 6583 Redeclaration = true; 6584 6585 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6586 if (!OldDecl && !Invalid) { 6587 Diag(UsingLoc, diag::err_redefinition_different_kind) 6588 << Name.Identifier; 6589 6590 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6591 if (OldD->getLocation().isValid()) 6592 Diag(OldD->getLocation(), diag::note_previous_definition); 6593 6594 Invalid = true; 6595 } 6596 6597 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6598 if (TemplateParameterListsAreEqual(TemplateParams, 6599 OldDecl->getTemplateParameters(), 6600 /*Complain=*/true, 6601 TPL_TemplateMatch)) 6602 OldTemplateParams = OldDecl->getTemplateParameters(); 6603 else 6604 Invalid = true; 6605 6606 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6607 if (!Invalid && 6608 !Context.hasSameType(OldTD->getUnderlyingType(), 6609 NewTD->getUnderlyingType())) { 6610 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6611 // but we can't reasonably accept it. 6612 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6613 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6614 if (OldTD->getLocation().isValid()) 6615 Diag(OldTD->getLocation(), diag::note_previous_definition); 6616 Invalid = true; 6617 } 6618 } 6619 } 6620 6621 // Merge any previous default template arguments into our parameters, 6622 // and check the parameter list. 6623 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6624 TPC_TypeAliasTemplate)) 6625 return 0; 6626 6627 TypeAliasTemplateDecl *NewDecl = 6628 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6629 Name.Identifier, TemplateParams, 6630 NewTD); 6631 6632 NewDecl->setAccess(AS); 6633 6634 if (Invalid) 6635 NewDecl->setInvalidDecl(); 6636 else if (OldDecl) 6637 NewDecl->setPreviousDeclaration(OldDecl); 6638 6639 NewND = NewDecl; 6640 } else { 6641 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6642 NewND = NewTD; 6643 } 6644 6645 if (!Redeclaration) 6646 PushOnScopeChains(NewND, S); 6647 6648 return NewND; 6649} 6650 6651Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6652 SourceLocation NamespaceLoc, 6653 SourceLocation AliasLoc, 6654 IdentifierInfo *Alias, 6655 CXXScopeSpec &SS, 6656 SourceLocation IdentLoc, 6657 IdentifierInfo *Ident) { 6658 6659 // Lookup the namespace name. 6660 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6661 LookupParsedName(R, S, &SS); 6662 6663 // Check if we have a previous declaration with the same name. 6664 NamedDecl *PrevDecl 6665 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6666 ForRedeclaration); 6667 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6668 PrevDecl = 0; 6669 6670 if (PrevDecl) { 6671 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6672 // We already have an alias with the same name that points to the same 6673 // namespace, so don't create a new one. 6674 // FIXME: At some point, we'll want to create the (redundant) 6675 // declaration to maintain better source information. 6676 if (!R.isAmbiguous() && !R.empty() && 6677 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6678 return 0; 6679 } 6680 6681 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6682 diag::err_redefinition_different_kind; 6683 Diag(AliasLoc, DiagID) << Alias; 6684 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6685 return 0; 6686 } 6687 6688 if (R.isAmbiguous()) 6689 return 0; 6690 6691 if (R.empty()) { 6692 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6693 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6694 return 0; 6695 } 6696 } 6697 6698 NamespaceAliasDecl *AliasDecl = 6699 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6700 Alias, SS.getWithLocInContext(Context), 6701 IdentLoc, R.getFoundDecl()); 6702 6703 PushOnScopeChains(AliasDecl, S); 6704 return AliasDecl; 6705} 6706 6707namespace { 6708 /// \brief Scoped object used to handle the state changes required in Sema 6709 /// to implicitly define the body of a C++ member function; 6710 class ImplicitlyDefinedFunctionScope { 6711 Sema &S; 6712 Sema::ContextRAII SavedContext; 6713 6714 public: 6715 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6716 : S(S), SavedContext(S, Method) 6717 { 6718 S.PushFunctionScope(); 6719 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6720 } 6721 6722 ~ImplicitlyDefinedFunctionScope() { 6723 S.PopExpressionEvaluationContext(); 6724 S.PopFunctionScopeInfo(); 6725 } 6726 }; 6727} 6728 6729Sema::ImplicitExceptionSpecification 6730Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6731 // C++ [except.spec]p14: 6732 // An implicitly declared special member function (Clause 12) shall have an 6733 // exception-specification. [...] 6734 ImplicitExceptionSpecification ExceptSpec(Context); 6735 if (ClassDecl->isInvalidDecl()) 6736 return ExceptSpec; 6737 6738 // Direct base-class constructors. 6739 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6740 BEnd = ClassDecl->bases_end(); 6741 B != BEnd; ++B) { 6742 if (B->isVirtual()) // Handled below. 6743 continue; 6744 6745 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6746 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6747 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6748 // If this is a deleted function, add it anyway. This might be conformant 6749 // with the standard. This might not. I'm not sure. It might not matter. 6750 if (Constructor) 6751 ExceptSpec.CalledDecl(Constructor); 6752 } 6753 } 6754 6755 // Virtual base-class constructors. 6756 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6757 BEnd = ClassDecl->vbases_end(); 6758 B != BEnd; ++B) { 6759 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6760 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6761 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6762 // If this is a deleted function, add it anyway. This might be conformant 6763 // with the standard. This might not. I'm not sure. It might not matter. 6764 if (Constructor) 6765 ExceptSpec.CalledDecl(Constructor); 6766 } 6767 } 6768 6769 // Field constructors. 6770 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6771 FEnd = ClassDecl->field_end(); 6772 F != FEnd; ++F) { 6773 if (F->hasInClassInitializer()) { 6774 if (Expr *E = F->getInClassInitializer()) 6775 ExceptSpec.CalledExpr(E); 6776 else if (!F->isInvalidDecl()) 6777 ExceptSpec.SetDelayed(); 6778 } else if (const RecordType *RecordTy 6779 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6780 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6781 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6782 // If this is a deleted function, add it anyway. This might be conformant 6783 // with the standard. This might not. I'm not sure. It might not matter. 6784 // In particular, the problem is that this function never gets called. It 6785 // might just be ill-formed because this function attempts to refer to 6786 // a deleted function here. 6787 if (Constructor) 6788 ExceptSpec.CalledDecl(Constructor); 6789 } 6790 } 6791 6792 return ExceptSpec; 6793} 6794 6795CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6796 CXXRecordDecl *ClassDecl) { 6797 // C++ [class.ctor]p5: 6798 // A default constructor for a class X is a constructor of class X 6799 // that can be called without an argument. If there is no 6800 // user-declared constructor for class X, a default constructor is 6801 // implicitly declared. An implicitly-declared default constructor 6802 // is an inline public member of its class. 6803 assert(!ClassDecl->hasUserDeclaredConstructor() && 6804 "Should not build implicit default constructor!"); 6805 6806 ImplicitExceptionSpecification Spec = 6807 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6808 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6809 6810 // Create the actual constructor declaration. 6811 CanQualType ClassType 6812 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6813 SourceLocation ClassLoc = ClassDecl->getLocation(); 6814 DeclarationName Name 6815 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6816 DeclarationNameInfo NameInfo(Name, ClassLoc); 6817 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6818 Context, ClassDecl, ClassLoc, NameInfo, 6819 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6820 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6821 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 6822 getLangOptions().CPlusPlus0x); 6823 DefaultCon->setAccess(AS_public); 6824 DefaultCon->setDefaulted(); 6825 DefaultCon->setImplicit(); 6826 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6827 6828 // Note that we have declared this constructor. 6829 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6830 6831 if (Scope *S = getScopeForContext(ClassDecl)) 6832 PushOnScopeChains(DefaultCon, S, false); 6833 ClassDecl->addDecl(DefaultCon); 6834 6835 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6836 DefaultCon->setDeletedAsWritten(); 6837 6838 return DefaultCon; 6839} 6840 6841void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6842 CXXConstructorDecl *Constructor) { 6843 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6844 !Constructor->doesThisDeclarationHaveABody() && 6845 !Constructor->isDeleted()) && 6846 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6847 6848 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6849 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6850 6851 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6852 DiagnosticErrorTrap Trap(Diags); 6853 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6854 Trap.hasErrorOccurred()) { 6855 Diag(CurrentLocation, diag::note_member_synthesized_at) 6856 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6857 Constructor->setInvalidDecl(); 6858 return; 6859 } 6860 6861 SourceLocation Loc = Constructor->getLocation(); 6862 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6863 6864 Constructor->setUsed(); 6865 MarkVTableUsed(CurrentLocation, ClassDecl); 6866 6867 if (ASTMutationListener *L = getASTMutationListener()) { 6868 L->CompletedImplicitDefinition(Constructor); 6869 } 6870} 6871 6872/// Get any existing defaulted default constructor for the given class. Do not 6873/// implicitly define one if it does not exist. 6874static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6875 CXXRecordDecl *D) { 6876 ASTContext &Context = Self.Context; 6877 QualType ClassType = Context.getTypeDeclType(D); 6878 DeclarationName ConstructorName 6879 = Context.DeclarationNames.getCXXConstructorName( 6880 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6881 6882 DeclContext::lookup_const_iterator Con, ConEnd; 6883 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6884 Con != ConEnd; ++Con) { 6885 // A function template cannot be defaulted. 6886 if (isa<FunctionTemplateDecl>(*Con)) 6887 continue; 6888 6889 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6890 if (Constructor->isDefaultConstructor()) 6891 return Constructor->isDefaulted() ? Constructor : 0; 6892 } 6893 return 0; 6894} 6895 6896void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6897 if (!D) return; 6898 AdjustDeclIfTemplate(D); 6899 6900 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6901 CXXConstructorDecl *CtorDecl 6902 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6903 6904 if (!CtorDecl) return; 6905 6906 // Compute the exception specification for the default constructor. 6907 const FunctionProtoType *CtorTy = 6908 CtorDecl->getType()->castAs<FunctionProtoType>(); 6909 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6910 ImplicitExceptionSpecification Spec = 6911 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6912 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6913 assert(EPI.ExceptionSpecType != EST_Delayed); 6914 6915 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6916 } 6917 6918 // If the default constructor is explicitly defaulted, checking the exception 6919 // specification is deferred until now. 6920 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6921 !ClassDecl->isDependentType()) 6922 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6923} 6924 6925void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6926 // We start with an initial pass over the base classes to collect those that 6927 // inherit constructors from. If there are none, we can forgo all further 6928 // processing. 6929 typedef SmallVector<const RecordType *, 4> BasesVector; 6930 BasesVector BasesToInheritFrom; 6931 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6932 BaseE = ClassDecl->bases_end(); 6933 BaseIt != BaseE; ++BaseIt) { 6934 if (BaseIt->getInheritConstructors()) { 6935 QualType Base = BaseIt->getType(); 6936 if (Base->isDependentType()) { 6937 // If we inherit constructors from anything that is dependent, just 6938 // abort processing altogether. We'll get another chance for the 6939 // instantiations. 6940 return; 6941 } 6942 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6943 } 6944 } 6945 if (BasesToInheritFrom.empty()) 6946 return; 6947 6948 // Now collect the constructors that we already have in the current class. 6949 // Those take precedence over inherited constructors. 6950 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6951 // unless there is a user-declared constructor with the same signature in 6952 // the class where the using-declaration appears. 6953 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6954 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6955 CtorE = ClassDecl->ctor_end(); 6956 CtorIt != CtorE; ++CtorIt) { 6957 ExistingConstructors.insert( 6958 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6959 } 6960 6961 Scope *S = getScopeForContext(ClassDecl); 6962 DeclarationName CreatedCtorName = 6963 Context.DeclarationNames.getCXXConstructorName( 6964 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6965 6966 // Now comes the true work. 6967 // First, we keep a map from constructor types to the base that introduced 6968 // them. Needed for finding conflicting constructors. We also keep the 6969 // actually inserted declarations in there, for pretty diagnostics. 6970 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6971 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6972 ConstructorToSourceMap InheritedConstructors; 6973 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6974 BaseE = BasesToInheritFrom.end(); 6975 BaseIt != BaseE; ++BaseIt) { 6976 const RecordType *Base = *BaseIt; 6977 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6978 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6979 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6980 CtorE = BaseDecl->ctor_end(); 6981 CtorIt != CtorE; ++CtorIt) { 6982 // Find the using declaration for inheriting this base's constructors. 6983 DeclarationName Name = 6984 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6985 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6986 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6987 SourceLocation UsingLoc = UD ? UD->getLocation() : 6988 ClassDecl->getLocation(); 6989 6990 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6991 // from the class X named in the using-declaration consists of actual 6992 // constructors and notional constructors that result from the 6993 // transformation of defaulted parameters as follows: 6994 // - all non-template default constructors of X, and 6995 // - for each non-template constructor of X that has at least one 6996 // parameter with a default argument, the set of constructors that 6997 // results from omitting any ellipsis parameter specification and 6998 // successively omitting parameters with a default argument from the 6999 // end of the parameter-type-list. 7000 CXXConstructorDecl *BaseCtor = *CtorIt; 7001 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7002 const FunctionProtoType *BaseCtorType = 7003 BaseCtor->getType()->getAs<FunctionProtoType>(); 7004 7005 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7006 maxParams = BaseCtor->getNumParams(); 7007 params <= maxParams; ++params) { 7008 // Skip default constructors. They're never inherited. 7009 if (params == 0) 7010 continue; 7011 // Skip copy and move constructors for the same reason. 7012 if (CanBeCopyOrMove && params == 1) 7013 continue; 7014 7015 // Build up a function type for this particular constructor. 7016 // FIXME: The working paper does not consider that the exception spec 7017 // for the inheriting constructor might be larger than that of the 7018 // source. This code doesn't yet, either. When it does, this code will 7019 // need to be delayed until after exception specifications and in-class 7020 // member initializers are attached. 7021 const Type *NewCtorType; 7022 if (params == maxParams) 7023 NewCtorType = BaseCtorType; 7024 else { 7025 SmallVector<QualType, 16> Args; 7026 for (unsigned i = 0; i < params; ++i) { 7027 Args.push_back(BaseCtorType->getArgType(i)); 7028 } 7029 FunctionProtoType::ExtProtoInfo ExtInfo = 7030 BaseCtorType->getExtProtoInfo(); 7031 ExtInfo.Variadic = false; 7032 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7033 Args.data(), params, ExtInfo) 7034 .getTypePtr(); 7035 } 7036 const Type *CanonicalNewCtorType = 7037 Context.getCanonicalType(NewCtorType); 7038 7039 // Now that we have the type, first check if the class already has a 7040 // constructor with this signature. 7041 if (ExistingConstructors.count(CanonicalNewCtorType)) 7042 continue; 7043 7044 // Then we check if we have already declared an inherited constructor 7045 // with this signature. 7046 std::pair<ConstructorToSourceMap::iterator, bool> result = 7047 InheritedConstructors.insert(std::make_pair( 7048 CanonicalNewCtorType, 7049 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7050 if (!result.second) { 7051 // Already in the map. If it came from a different class, that's an 7052 // error. Not if it's from the same. 7053 CanQualType PreviousBase = result.first->second.first; 7054 if (CanonicalBase != PreviousBase) { 7055 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7056 const CXXConstructorDecl *PrevBaseCtor = 7057 PrevCtor->getInheritedConstructor(); 7058 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7059 7060 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7061 Diag(BaseCtor->getLocation(), 7062 diag::note_using_decl_constructor_conflict_current_ctor); 7063 Diag(PrevBaseCtor->getLocation(), 7064 diag::note_using_decl_constructor_conflict_previous_ctor); 7065 Diag(PrevCtor->getLocation(), 7066 diag::note_using_decl_constructor_conflict_previous_using); 7067 } 7068 continue; 7069 } 7070 7071 // OK, we're there, now add the constructor. 7072 // C++0x [class.inhctor]p8: [...] that would be performed by a 7073 // user-written inline constructor [...] 7074 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7075 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7076 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7077 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7078 /*ImplicitlyDeclared=*/true, 7079 // FIXME: Due to a defect in the standard, we treat inherited 7080 // constructors as constexpr even if that makes them ill-formed. 7081 /*Constexpr=*/BaseCtor->isConstexpr()); 7082 NewCtor->setAccess(BaseCtor->getAccess()); 7083 7084 // Build up the parameter decls and add them. 7085 SmallVector<ParmVarDecl *, 16> ParamDecls; 7086 for (unsigned i = 0; i < params; ++i) { 7087 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7088 UsingLoc, UsingLoc, 7089 /*IdentifierInfo=*/0, 7090 BaseCtorType->getArgType(i), 7091 /*TInfo=*/0, SC_None, 7092 SC_None, /*DefaultArg=*/0)); 7093 } 7094 NewCtor->setParams(ParamDecls); 7095 NewCtor->setInheritedConstructor(BaseCtor); 7096 7097 PushOnScopeChains(NewCtor, S, false); 7098 ClassDecl->addDecl(NewCtor); 7099 result.first->second.second = NewCtor; 7100 } 7101 } 7102 } 7103} 7104 7105Sema::ImplicitExceptionSpecification 7106Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7107 // C++ [except.spec]p14: 7108 // An implicitly declared special member function (Clause 12) shall have 7109 // an exception-specification. 7110 ImplicitExceptionSpecification ExceptSpec(Context); 7111 if (ClassDecl->isInvalidDecl()) 7112 return ExceptSpec; 7113 7114 // Direct base-class destructors. 7115 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7116 BEnd = ClassDecl->bases_end(); 7117 B != BEnd; ++B) { 7118 if (B->isVirtual()) // Handled below. 7119 continue; 7120 7121 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7122 ExceptSpec.CalledDecl( 7123 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7124 } 7125 7126 // Virtual base-class destructors. 7127 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7128 BEnd = ClassDecl->vbases_end(); 7129 B != BEnd; ++B) { 7130 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7131 ExceptSpec.CalledDecl( 7132 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7133 } 7134 7135 // Field destructors. 7136 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7137 FEnd = ClassDecl->field_end(); 7138 F != FEnd; ++F) { 7139 if (const RecordType *RecordTy 7140 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7141 ExceptSpec.CalledDecl( 7142 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7143 } 7144 7145 return ExceptSpec; 7146} 7147 7148CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7149 // C++ [class.dtor]p2: 7150 // If a class has no user-declared destructor, a destructor is 7151 // declared implicitly. An implicitly-declared destructor is an 7152 // inline public member of its class. 7153 7154 ImplicitExceptionSpecification Spec = 7155 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7156 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7157 7158 // Create the actual destructor declaration. 7159 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7160 7161 CanQualType ClassType 7162 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7163 SourceLocation ClassLoc = ClassDecl->getLocation(); 7164 DeclarationName Name 7165 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7166 DeclarationNameInfo NameInfo(Name, ClassLoc); 7167 CXXDestructorDecl *Destructor 7168 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7169 /*isInline=*/true, 7170 /*isImplicitlyDeclared=*/true); 7171 Destructor->setAccess(AS_public); 7172 Destructor->setDefaulted(); 7173 Destructor->setImplicit(); 7174 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7175 7176 // Note that we have declared this destructor. 7177 ++ASTContext::NumImplicitDestructorsDeclared; 7178 7179 // Introduce this destructor into its scope. 7180 if (Scope *S = getScopeForContext(ClassDecl)) 7181 PushOnScopeChains(Destructor, S, false); 7182 ClassDecl->addDecl(Destructor); 7183 7184 // This could be uniqued if it ever proves significant. 7185 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7186 7187 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7188 Destructor->setDeletedAsWritten(); 7189 7190 AddOverriddenMethods(ClassDecl, Destructor); 7191 7192 return Destructor; 7193} 7194 7195void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7196 CXXDestructorDecl *Destructor) { 7197 assert((Destructor->isDefaulted() && 7198 !Destructor->doesThisDeclarationHaveABody()) && 7199 "DefineImplicitDestructor - call it for implicit default dtor"); 7200 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7201 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7202 7203 if (Destructor->isInvalidDecl()) 7204 return; 7205 7206 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7207 7208 DiagnosticErrorTrap Trap(Diags); 7209 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7210 Destructor->getParent()); 7211 7212 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7213 Diag(CurrentLocation, diag::note_member_synthesized_at) 7214 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7215 7216 Destructor->setInvalidDecl(); 7217 return; 7218 } 7219 7220 SourceLocation Loc = Destructor->getLocation(); 7221 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7222 Destructor->setImplicitlyDefined(true); 7223 Destructor->setUsed(); 7224 MarkVTableUsed(CurrentLocation, ClassDecl); 7225 7226 if (ASTMutationListener *L = getASTMutationListener()) { 7227 L->CompletedImplicitDefinition(Destructor); 7228 } 7229} 7230 7231void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7232 CXXDestructorDecl *destructor) { 7233 // C++11 [class.dtor]p3: 7234 // A declaration of a destructor that does not have an exception- 7235 // specification is implicitly considered to have the same exception- 7236 // specification as an implicit declaration. 7237 const FunctionProtoType *dtorType = destructor->getType()-> 7238 getAs<FunctionProtoType>(); 7239 if (dtorType->hasExceptionSpec()) 7240 return; 7241 7242 ImplicitExceptionSpecification exceptSpec = 7243 ComputeDefaultedDtorExceptionSpec(classDecl); 7244 7245 // Replace the destructor's type, building off the existing one. Fortunately, 7246 // the only thing of interest in the destructor type is its extended info. 7247 // The return and arguments are fixed. 7248 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7249 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7250 epi.NumExceptions = exceptSpec.size(); 7251 epi.Exceptions = exceptSpec.data(); 7252 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7253 7254 destructor->setType(ty); 7255 7256 // FIXME: If the destructor has a body that could throw, and the newly created 7257 // spec doesn't allow exceptions, we should emit a warning, because this 7258 // change in behavior can break conforming C++03 programs at runtime. 7259 // However, we don't have a body yet, so it needs to be done somewhere else. 7260} 7261 7262/// \brief Builds a statement that copies/moves the given entity from \p From to 7263/// \c To. 7264/// 7265/// This routine is used to copy/move the members of a class with an 7266/// implicitly-declared copy/move assignment operator. When the entities being 7267/// copied are arrays, this routine builds for loops to copy them. 7268/// 7269/// \param S The Sema object used for type-checking. 7270/// 7271/// \param Loc The location where the implicit copy/move is being generated. 7272/// 7273/// \param T The type of the expressions being copied/moved. Both expressions 7274/// must have this type. 7275/// 7276/// \param To The expression we are copying/moving to. 7277/// 7278/// \param From The expression we are copying/moving from. 7279/// 7280/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7281/// Otherwise, it's a non-static member subobject. 7282/// 7283/// \param Copying Whether we're copying or moving. 7284/// 7285/// \param Depth Internal parameter recording the depth of the recursion. 7286/// 7287/// \returns A statement or a loop that copies the expressions. 7288static StmtResult 7289BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7290 Expr *To, Expr *From, 7291 bool CopyingBaseSubobject, bool Copying, 7292 unsigned Depth = 0) { 7293 // C++0x [class.copy]p28: 7294 // Each subobject is assigned in the manner appropriate to its type: 7295 // 7296 // - if the subobject is of class type, as if by a call to operator= with 7297 // the subobject as the object expression and the corresponding 7298 // subobject of x as a single function argument (as if by explicit 7299 // qualification; that is, ignoring any possible virtual overriding 7300 // functions in more derived classes); 7301 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7302 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7303 7304 // Look for operator=. 7305 DeclarationName Name 7306 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7307 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7308 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7309 7310 // Filter out any result that isn't a copy/move-assignment operator. 7311 LookupResult::Filter F = OpLookup.makeFilter(); 7312 while (F.hasNext()) { 7313 NamedDecl *D = F.next(); 7314 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7315 if (Copying ? Method->isCopyAssignmentOperator() : 7316 Method->isMoveAssignmentOperator()) 7317 continue; 7318 7319 F.erase(); 7320 } 7321 F.done(); 7322 7323 // Suppress the protected check (C++ [class.protected]) for each of the 7324 // assignment operators we found. This strange dance is required when 7325 // we're assigning via a base classes's copy-assignment operator. To 7326 // ensure that we're getting the right base class subobject (without 7327 // ambiguities), we need to cast "this" to that subobject type; to 7328 // ensure that we don't go through the virtual call mechanism, we need 7329 // to qualify the operator= name with the base class (see below). However, 7330 // this means that if the base class has a protected copy assignment 7331 // operator, the protected member access check will fail. So, we 7332 // rewrite "protected" access to "public" access in this case, since we 7333 // know by construction that we're calling from a derived class. 7334 if (CopyingBaseSubobject) { 7335 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7336 L != LEnd; ++L) { 7337 if (L.getAccess() == AS_protected) 7338 L.setAccess(AS_public); 7339 } 7340 } 7341 7342 // Create the nested-name-specifier that will be used to qualify the 7343 // reference to operator=; this is required to suppress the virtual 7344 // call mechanism. 7345 CXXScopeSpec SS; 7346 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7347 SS.MakeTrivial(S.Context, 7348 NestedNameSpecifier::Create(S.Context, 0, false, 7349 CanonicalT), 7350 Loc); 7351 7352 // Create the reference to operator=. 7353 ExprResult OpEqualRef 7354 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7355 /*TemplateKWLoc=*/SourceLocation(), 7356 /*FirstQualifierInScope=*/0, 7357 OpLookup, 7358 /*TemplateArgs=*/0, 7359 /*SuppressQualifierCheck=*/true); 7360 if (OpEqualRef.isInvalid()) 7361 return StmtError(); 7362 7363 // Build the call to the assignment operator. 7364 7365 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7366 OpEqualRef.takeAs<Expr>(), 7367 Loc, &From, 1, Loc); 7368 if (Call.isInvalid()) 7369 return StmtError(); 7370 7371 return S.Owned(Call.takeAs<Stmt>()); 7372 } 7373 7374 // - if the subobject is of scalar type, the built-in assignment 7375 // operator is used. 7376 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7377 if (!ArrayTy) { 7378 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7379 if (Assignment.isInvalid()) 7380 return StmtError(); 7381 7382 return S.Owned(Assignment.takeAs<Stmt>()); 7383 } 7384 7385 // - if the subobject is an array, each element is assigned, in the 7386 // manner appropriate to the element type; 7387 7388 // Construct a loop over the array bounds, e.g., 7389 // 7390 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7391 // 7392 // that will copy each of the array elements. 7393 QualType SizeType = S.Context.getSizeType(); 7394 7395 // Create the iteration variable. 7396 IdentifierInfo *IterationVarName = 0; 7397 { 7398 SmallString<8> Str; 7399 llvm::raw_svector_ostream OS(Str); 7400 OS << "__i" << Depth; 7401 IterationVarName = &S.Context.Idents.get(OS.str()); 7402 } 7403 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7404 IterationVarName, SizeType, 7405 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7406 SC_None, SC_None); 7407 7408 // Initialize the iteration variable to zero. 7409 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7410 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7411 7412 // Create a reference to the iteration variable; we'll use this several 7413 // times throughout. 7414 Expr *IterationVarRef 7415 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7416 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7417 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7418 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7419 7420 // Create the DeclStmt that holds the iteration variable. 7421 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7422 7423 // Create the comparison against the array bound. 7424 llvm::APInt Upper 7425 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7426 Expr *Comparison 7427 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7428 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7429 BO_NE, S.Context.BoolTy, 7430 VK_RValue, OK_Ordinary, Loc); 7431 7432 // Create the pre-increment of the iteration variable. 7433 Expr *Increment 7434 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7435 VK_LValue, OK_Ordinary, Loc); 7436 7437 // Subscript the "from" and "to" expressions with the iteration variable. 7438 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7439 IterationVarRefRVal, 7440 Loc)); 7441 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7442 IterationVarRefRVal, 7443 Loc)); 7444 if (!Copying) // Cast to rvalue 7445 From = CastForMoving(S, From); 7446 7447 // Build the copy/move for an individual element of the array. 7448 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7449 To, From, CopyingBaseSubobject, 7450 Copying, Depth + 1); 7451 if (Copy.isInvalid()) 7452 return StmtError(); 7453 7454 // Construct the loop that copies all elements of this array. 7455 return S.ActOnForStmt(Loc, Loc, InitStmt, 7456 S.MakeFullExpr(Comparison), 7457 0, S.MakeFullExpr(Increment), 7458 Loc, Copy.take()); 7459} 7460 7461std::pair<Sema::ImplicitExceptionSpecification, bool> 7462Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7463 CXXRecordDecl *ClassDecl) { 7464 if (ClassDecl->isInvalidDecl()) 7465 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7466 7467 // C++ [class.copy]p10: 7468 // If the class definition does not explicitly declare a copy 7469 // assignment operator, one is declared implicitly. 7470 // The implicitly-defined copy assignment operator for a class X 7471 // will have the form 7472 // 7473 // X& X::operator=(const X&) 7474 // 7475 // if 7476 bool HasConstCopyAssignment = true; 7477 7478 // -- each direct base class B of X has a copy assignment operator 7479 // whose parameter is of type const B&, const volatile B& or B, 7480 // and 7481 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7482 BaseEnd = ClassDecl->bases_end(); 7483 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7484 // We'll handle this below 7485 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7486 continue; 7487 7488 assert(!Base->getType()->isDependentType() && 7489 "Cannot generate implicit members for class with dependent bases."); 7490 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7491 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7492 &HasConstCopyAssignment); 7493 } 7494 7495 // In C++11, the above citation has "or virtual" added 7496 if (LangOpts.CPlusPlus0x) { 7497 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7498 BaseEnd = ClassDecl->vbases_end(); 7499 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7500 assert(!Base->getType()->isDependentType() && 7501 "Cannot generate implicit members for class with dependent bases."); 7502 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7503 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7504 &HasConstCopyAssignment); 7505 } 7506 } 7507 7508 // -- for all the nonstatic data members of X that are of a class 7509 // type M (or array thereof), each such class type has a copy 7510 // assignment operator whose parameter is of type const M&, 7511 // const volatile M& or M. 7512 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7513 FieldEnd = ClassDecl->field_end(); 7514 HasConstCopyAssignment && Field != FieldEnd; 7515 ++Field) { 7516 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7517 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7518 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7519 &HasConstCopyAssignment); 7520 } 7521 } 7522 7523 // Otherwise, the implicitly declared copy assignment operator will 7524 // have the form 7525 // 7526 // X& X::operator=(X&) 7527 7528 // C++ [except.spec]p14: 7529 // An implicitly declared special member function (Clause 12) shall have an 7530 // exception-specification. [...] 7531 7532 // It is unspecified whether or not an implicit copy assignment operator 7533 // attempts to deduplicate calls to assignment operators of virtual bases are 7534 // made. As such, this exception specification is effectively unspecified. 7535 // Based on a similar decision made for constness in C++0x, we're erring on 7536 // the side of assuming such calls to be made regardless of whether they 7537 // actually happen. 7538 ImplicitExceptionSpecification ExceptSpec(Context); 7539 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7540 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7541 BaseEnd = ClassDecl->bases_end(); 7542 Base != BaseEnd; ++Base) { 7543 if (Base->isVirtual()) 7544 continue; 7545 7546 CXXRecordDecl *BaseClassDecl 7547 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7548 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7549 ArgQuals, false, 0)) 7550 ExceptSpec.CalledDecl(CopyAssign); 7551 } 7552 7553 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7554 BaseEnd = ClassDecl->vbases_end(); 7555 Base != BaseEnd; ++Base) { 7556 CXXRecordDecl *BaseClassDecl 7557 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7558 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7559 ArgQuals, false, 0)) 7560 ExceptSpec.CalledDecl(CopyAssign); 7561 } 7562 7563 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7564 FieldEnd = ClassDecl->field_end(); 7565 Field != FieldEnd; 7566 ++Field) { 7567 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7568 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7569 if (CXXMethodDecl *CopyAssign = 7570 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7571 ExceptSpec.CalledDecl(CopyAssign); 7572 } 7573 } 7574 7575 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7576} 7577 7578CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7579 // Note: The following rules are largely analoguous to the copy 7580 // constructor rules. Note that virtual bases are not taken into account 7581 // for determining the argument type of the operator. Note also that 7582 // operators taking an object instead of a reference are allowed. 7583 7584 ImplicitExceptionSpecification Spec(Context); 7585 bool Const; 7586 llvm::tie(Spec, Const) = 7587 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7588 7589 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7590 QualType RetType = Context.getLValueReferenceType(ArgType); 7591 if (Const) 7592 ArgType = ArgType.withConst(); 7593 ArgType = Context.getLValueReferenceType(ArgType); 7594 7595 // An implicitly-declared copy assignment operator is an inline public 7596 // member of its class. 7597 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7598 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7599 SourceLocation ClassLoc = ClassDecl->getLocation(); 7600 DeclarationNameInfo NameInfo(Name, ClassLoc); 7601 CXXMethodDecl *CopyAssignment 7602 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7603 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7604 /*TInfo=*/0, /*isStatic=*/false, 7605 /*StorageClassAsWritten=*/SC_None, 7606 /*isInline=*/true, /*isConstexpr=*/false, 7607 SourceLocation()); 7608 CopyAssignment->setAccess(AS_public); 7609 CopyAssignment->setDefaulted(); 7610 CopyAssignment->setImplicit(); 7611 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7612 7613 // Add the parameter to the operator. 7614 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7615 ClassLoc, ClassLoc, /*Id=*/0, 7616 ArgType, /*TInfo=*/0, 7617 SC_None, 7618 SC_None, 0); 7619 CopyAssignment->setParams(FromParam); 7620 7621 // Note that we have added this copy-assignment operator. 7622 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7623 7624 if (Scope *S = getScopeForContext(ClassDecl)) 7625 PushOnScopeChains(CopyAssignment, S, false); 7626 ClassDecl->addDecl(CopyAssignment); 7627 7628 // C++0x [class.copy]p19: 7629 // .... If the class definition does not explicitly declare a copy 7630 // assignment operator, there is no user-declared move constructor, and 7631 // there is no user-declared move assignment operator, a copy assignment 7632 // operator is implicitly declared as defaulted. 7633 if ((ClassDecl->hasUserDeclaredMoveConstructor() && 7634 !getLangOptions().MicrosoftMode) || 7635 ClassDecl->hasUserDeclaredMoveAssignment() || 7636 ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7637 CopyAssignment->setDeletedAsWritten(); 7638 7639 AddOverriddenMethods(ClassDecl, CopyAssignment); 7640 return CopyAssignment; 7641} 7642 7643void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7644 CXXMethodDecl *CopyAssignOperator) { 7645 assert((CopyAssignOperator->isDefaulted() && 7646 CopyAssignOperator->isOverloadedOperator() && 7647 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7648 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7649 "DefineImplicitCopyAssignment called for wrong function"); 7650 7651 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7652 7653 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7654 CopyAssignOperator->setInvalidDecl(); 7655 return; 7656 } 7657 7658 CopyAssignOperator->setUsed(); 7659 7660 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7661 DiagnosticErrorTrap Trap(Diags); 7662 7663 // C++0x [class.copy]p30: 7664 // The implicitly-defined or explicitly-defaulted copy assignment operator 7665 // for a non-union class X performs memberwise copy assignment of its 7666 // subobjects. The direct base classes of X are assigned first, in the 7667 // order of their declaration in the base-specifier-list, and then the 7668 // immediate non-static data members of X are assigned, in the order in 7669 // which they were declared in the class definition. 7670 7671 // The statements that form the synthesized function body. 7672 ASTOwningVector<Stmt*> Statements(*this); 7673 7674 // The parameter for the "other" object, which we are copying from. 7675 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7676 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7677 QualType OtherRefType = Other->getType(); 7678 if (const LValueReferenceType *OtherRef 7679 = OtherRefType->getAs<LValueReferenceType>()) { 7680 OtherRefType = OtherRef->getPointeeType(); 7681 OtherQuals = OtherRefType.getQualifiers(); 7682 } 7683 7684 // Our location for everything implicitly-generated. 7685 SourceLocation Loc = CopyAssignOperator->getLocation(); 7686 7687 // Construct a reference to the "other" object. We'll be using this 7688 // throughout the generated ASTs. 7689 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7690 assert(OtherRef && "Reference to parameter cannot fail!"); 7691 7692 // Construct the "this" pointer. We'll be using this throughout the generated 7693 // ASTs. 7694 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7695 assert(This && "Reference to this cannot fail!"); 7696 7697 // Assign base classes. 7698 bool Invalid = false; 7699 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7700 E = ClassDecl->bases_end(); Base != E; ++Base) { 7701 // Form the assignment: 7702 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7703 QualType BaseType = Base->getType().getUnqualifiedType(); 7704 if (!BaseType->isRecordType()) { 7705 Invalid = true; 7706 continue; 7707 } 7708 7709 CXXCastPath BasePath; 7710 BasePath.push_back(Base); 7711 7712 // Construct the "from" expression, which is an implicit cast to the 7713 // appropriately-qualified base type. 7714 Expr *From = OtherRef; 7715 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7716 CK_UncheckedDerivedToBase, 7717 VK_LValue, &BasePath).take(); 7718 7719 // Dereference "this". 7720 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7721 7722 // Implicitly cast "this" to the appropriately-qualified base type. 7723 To = ImpCastExprToType(To.take(), 7724 Context.getCVRQualifiedType(BaseType, 7725 CopyAssignOperator->getTypeQualifiers()), 7726 CK_UncheckedDerivedToBase, 7727 VK_LValue, &BasePath); 7728 7729 // Build the copy. 7730 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7731 To.get(), From, 7732 /*CopyingBaseSubobject=*/true, 7733 /*Copying=*/true); 7734 if (Copy.isInvalid()) { 7735 Diag(CurrentLocation, diag::note_member_synthesized_at) 7736 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7737 CopyAssignOperator->setInvalidDecl(); 7738 return; 7739 } 7740 7741 // Success! Record the copy. 7742 Statements.push_back(Copy.takeAs<Expr>()); 7743 } 7744 7745 // \brief Reference to the __builtin_memcpy function. 7746 Expr *BuiltinMemCpyRef = 0; 7747 // \brief Reference to the __builtin_objc_memmove_collectable function. 7748 Expr *CollectableMemCpyRef = 0; 7749 7750 // Assign non-static members. 7751 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7752 FieldEnd = ClassDecl->field_end(); 7753 Field != FieldEnd; ++Field) { 7754 if (Field->isUnnamedBitfield()) 7755 continue; 7756 7757 // Check for members of reference type; we can't copy those. 7758 if (Field->getType()->isReferenceType()) { 7759 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7760 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7761 Diag(Field->getLocation(), diag::note_declared_at); 7762 Diag(CurrentLocation, diag::note_member_synthesized_at) 7763 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7764 Invalid = true; 7765 continue; 7766 } 7767 7768 // Check for members of const-qualified, non-class type. 7769 QualType BaseType = Context.getBaseElementType(Field->getType()); 7770 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7771 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7772 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7773 Diag(Field->getLocation(), diag::note_declared_at); 7774 Diag(CurrentLocation, diag::note_member_synthesized_at) 7775 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7776 Invalid = true; 7777 continue; 7778 } 7779 7780 // Suppress assigning zero-width bitfields. 7781 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7782 continue; 7783 7784 QualType FieldType = Field->getType().getNonReferenceType(); 7785 if (FieldType->isIncompleteArrayType()) { 7786 assert(ClassDecl->hasFlexibleArrayMember() && 7787 "Incomplete array type is not valid"); 7788 continue; 7789 } 7790 7791 // Build references to the field in the object we're copying from and to. 7792 CXXScopeSpec SS; // Intentionally empty 7793 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7794 LookupMemberName); 7795 MemberLookup.addDecl(*Field); 7796 MemberLookup.resolveKind(); 7797 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7798 Loc, /*IsArrow=*/false, 7799 SS, SourceLocation(), 0, 7800 MemberLookup, 0); 7801 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7802 Loc, /*IsArrow=*/true, 7803 SS, SourceLocation(), 0, 7804 MemberLookup, 0); 7805 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7806 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7807 7808 // If the field should be copied with __builtin_memcpy rather than via 7809 // explicit assignments, do so. This optimization only applies for arrays 7810 // of scalars and arrays of class type with trivial copy-assignment 7811 // operators. 7812 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7813 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7814 // Compute the size of the memory buffer to be copied. 7815 QualType SizeType = Context.getSizeType(); 7816 llvm::APInt Size(Context.getTypeSize(SizeType), 7817 Context.getTypeSizeInChars(BaseType).getQuantity()); 7818 for (const ConstantArrayType *Array 7819 = Context.getAsConstantArrayType(FieldType); 7820 Array; 7821 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7822 llvm::APInt ArraySize 7823 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7824 Size *= ArraySize; 7825 } 7826 7827 // Take the address of the field references for "from" and "to". 7828 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7829 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7830 7831 bool NeedsCollectableMemCpy = 7832 (BaseType->isRecordType() && 7833 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7834 7835 if (NeedsCollectableMemCpy) { 7836 if (!CollectableMemCpyRef) { 7837 // Create a reference to the __builtin_objc_memmove_collectable function. 7838 LookupResult R(*this, 7839 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7840 Loc, LookupOrdinaryName); 7841 LookupName(R, TUScope, true); 7842 7843 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7844 if (!CollectableMemCpy) { 7845 // Something went horribly wrong earlier, and we will have 7846 // complained about it. 7847 Invalid = true; 7848 continue; 7849 } 7850 7851 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7852 CollectableMemCpy->getType(), 7853 VK_LValue, Loc, 0).take(); 7854 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7855 } 7856 } 7857 // Create a reference to the __builtin_memcpy builtin function. 7858 else if (!BuiltinMemCpyRef) { 7859 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7860 LookupOrdinaryName); 7861 LookupName(R, TUScope, true); 7862 7863 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7864 if (!BuiltinMemCpy) { 7865 // Something went horribly wrong earlier, and we will have complained 7866 // about it. 7867 Invalid = true; 7868 continue; 7869 } 7870 7871 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7872 BuiltinMemCpy->getType(), 7873 VK_LValue, Loc, 0).take(); 7874 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7875 } 7876 7877 ASTOwningVector<Expr*> CallArgs(*this); 7878 CallArgs.push_back(To.takeAs<Expr>()); 7879 CallArgs.push_back(From.takeAs<Expr>()); 7880 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7881 ExprResult Call = ExprError(); 7882 if (NeedsCollectableMemCpy) 7883 Call = ActOnCallExpr(/*Scope=*/0, 7884 CollectableMemCpyRef, 7885 Loc, move_arg(CallArgs), 7886 Loc); 7887 else 7888 Call = ActOnCallExpr(/*Scope=*/0, 7889 BuiltinMemCpyRef, 7890 Loc, move_arg(CallArgs), 7891 Loc); 7892 7893 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7894 Statements.push_back(Call.takeAs<Expr>()); 7895 continue; 7896 } 7897 7898 // Build the copy of this field. 7899 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7900 To.get(), From.get(), 7901 /*CopyingBaseSubobject=*/false, 7902 /*Copying=*/true); 7903 if (Copy.isInvalid()) { 7904 Diag(CurrentLocation, diag::note_member_synthesized_at) 7905 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7906 CopyAssignOperator->setInvalidDecl(); 7907 return; 7908 } 7909 7910 // Success! Record the copy. 7911 Statements.push_back(Copy.takeAs<Stmt>()); 7912 } 7913 7914 if (!Invalid) { 7915 // Add a "return *this;" 7916 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7917 7918 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7919 if (Return.isInvalid()) 7920 Invalid = true; 7921 else { 7922 Statements.push_back(Return.takeAs<Stmt>()); 7923 7924 if (Trap.hasErrorOccurred()) { 7925 Diag(CurrentLocation, diag::note_member_synthesized_at) 7926 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7927 Invalid = true; 7928 } 7929 } 7930 } 7931 7932 if (Invalid) { 7933 CopyAssignOperator->setInvalidDecl(); 7934 return; 7935 } 7936 7937 StmtResult Body; 7938 { 7939 CompoundScopeRAII CompoundScope(*this); 7940 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7941 /*isStmtExpr=*/false); 7942 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7943 } 7944 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7945 7946 if (ASTMutationListener *L = getASTMutationListener()) { 7947 L->CompletedImplicitDefinition(CopyAssignOperator); 7948 } 7949} 7950 7951Sema::ImplicitExceptionSpecification 7952Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7953 ImplicitExceptionSpecification ExceptSpec(Context); 7954 7955 if (ClassDecl->isInvalidDecl()) 7956 return ExceptSpec; 7957 7958 // C++0x [except.spec]p14: 7959 // An implicitly declared special member function (Clause 12) shall have an 7960 // exception-specification. [...] 7961 7962 // It is unspecified whether or not an implicit move assignment operator 7963 // attempts to deduplicate calls to assignment operators of virtual bases are 7964 // made. As such, this exception specification is effectively unspecified. 7965 // Based on a similar decision made for constness in C++0x, we're erring on 7966 // the side of assuming such calls to be made regardless of whether they 7967 // actually happen. 7968 // Note that a move constructor is not implicitly declared when there are 7969 // virtual bases, but it can still be user-declared and explicitly defaulted. 7970 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7971 BaseEnd = ClassDecl->bases_end(); 7972 Base != BaseEnd; ++Base) { 7973 if (Base->isVirtual()) 7974 continue; 7975 7976 CXXRecordDecl *BaseClassDecl 7977 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7978 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7979 false, 0)) 7980 ExceptSpec.CalledDecl(MoveAssign); 7981 } 7982 7983 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7984 BaseEnd = ClassDecl->vbases_end(); 7985 Base != BaseEnd; ++Base) { 7986 CXXRecordDecl *BaseClassDecl 7987 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7988 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7989 false, 0)) 7990 ExceptSpec.CalledDecl(MoveAssign); 7991 } 7992 7993 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7994 FieldEnd = ClassDecl->field_end(); 7995 Field != FieldEnd; 7996 ++Field) { 7997 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7998 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7999 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8000 false, 0)) 8001 ExceptSpec.CalledDecl(MoveAssign); 8002 } 8003 } 8004 8005 return ExceptSpec; 8006} 8007 8008CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8009 // Note: The following rules are largely analoguous to the move 8010 // constructor rules. 8011 8012 ImplicitExceptionSpecification Spec( 8013 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8014 8015 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8016 QualType RetType = Context.getLValueReferenceType(ArgType); 8017 ArgType = Context.getRValueReferenceType(ArgType); 8018 8019 // An implicitly-declared move assignment operator is an inline public 8020 // member of its class. 8021 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8022 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8023 SourceLocation ClassLoc = ClassDecl->getLocation(); 8024 DeclarationNameInfo NameInfo(Name, ClassLoc); 8025 CXXMethodDecl *MoveAssignment 8026 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8027 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8028 /*TInfo=*/0, /*isStatic=*/false, 8029 /*StorageClassAsWritten=*/SC_None, 8030 /*isInline=*/true, 8031 /*isConstexpr=*/false, 8032 SourceLocation()); 8033 MoveAssignment->setAccess(AS_public); 8034 MoveAssignment->setDefaulted(); 8035 MoveAssignment->setImplicit(); 8036 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8037 8038 // Add the parameter to the operator. 8039 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8040 ClassLoc, ClassLoc, /*Id=*/0, 8041 ArgType, /*TInfo=*/0, 8042 SC_None, 8043 SC_None, 0); 8044 MoveAssignment->setParams(FromParam); 8045 8046 // Note that we have added this copy-assignment operator. 8047 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8048 8049 // C++0x [class.copy]p9: 8050 // If the definition of a class X does not explicitly declare a move 8051 // assignment operator, one will be implicitly declared as defaulted if and 8052 // only if: 8053 // [...] 8054 // - the move assignment operator would not be implicitly defined as 8055 // deleted. 8056 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8057 // Cache this result so that we don't try to generate this over and over 8058 // on every lookup, leaking memory and wasting time. 8059 ClassDecl->setFailedImplicitMoveAssignment(); 8060 return 0; 8061 } 8062 8063 if (Scope *S = getScopeForContext(ClassDecl)) 8064 PushOnScopeChains(MoveAssignment, S, false); 8065 ClassDecl->addDecl(MoveAssignment); 8066 8067 AddOverriddenMethods(ClassDecl, MoveAssignment); 8068 return MoveAssignment; 8069} 8070 8071void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8072 CXXMethodDecl *MoveAssignOperator) { 8073 assert((MoveAssignOperator->isDefaulted() && 8074 MoveAssignOperator->isOverloadedOperator() && 8075 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8076 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8077 "DefineImplicitMoveAssignment called for wrong function"); 8078 8079 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8080 8081 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8082 MoveAssignOperator->setInvalidDecl(); 8083 return; 8084 } 8085 8086 MoveAssignOperator->setUsed(); 8087 8088 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8089 DiagnosticErrorTrap Trap(Diags); 8090 8091 // C++0x [class.copy]p28: 8092 // The implicitly-defined or move assignment operator for a non-union class 8093 // X performs memberwise move assignment of its subobjects. The direct base 8094 // classes of X are assigned first, in the order of their declaration in the 8095 // base-specifier-list, and then the immediate non-static data members of X 8096 // are assigned, in the order in which they were declared in the class 8097 // definition. 8098 8099 // The statements that form the synthesized function body. 8100 ASTOwningVector<Stmt*> Statements(*this); 8101 8102 // The parameter for the "other" object, which we are move from. 8103 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8104 QualType OtherRefType = Other->getType()-> 8105 getAs<RValueReferenceType>()->getPointeeType(); 8106 assert(OtherRefType.getQualifiers() == 0 && 8107 "Bad argument type of defaulted move assignment"); 8108 8109 // Our location for everything implicitly-generated. 8110 SourceLocation Loc = MoveAssignOperator->getLocation(); 8111 8112 // Construct a reference to the "other" object. We'll be using this 8113 // throughout the generated ASTs. 8114 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8115 assert(OtherRef && "Reference to parameter cannot fail!"); 8116 // Cast to rvalue. 8117 OtherRef = CastForMoving(*this, OtherRef); 8118 8119 // Construct the "this" pointer. We'll be using this throughout the generated 8120 // ASTs. 8121 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8122 assert(This && "Reference to this cannot fail!"); 8123 8124 // Assign base classes. 8125 bool Invalid = false; 8126 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8127 E = ClassDecl->bases_end(); Base != E; ++Base) { 8128 // Form the assignment: 8129 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8130 QualType BaseType = Base->getType().getUnqualifiedType(); 8131 if (!BaseType->isRecordType()) { 8132 Invalid = true; 8133 continue; 8134 } 8135 8136 CXXCastPath BasePath; 8137 BasePath.push_back(Base); 8138 8139 // Construct the "from" expression, which is an implicit cast to the 8140 // appropriately-qualified base type. 8141 Expr *From = OtherRef; 8142 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8143 VK_XValue, &BasePath).take(); 8144 8145 // Dereference "this". 8146 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8147 8148 // Implicitly cast "this" to the appropriately-qualified base type. 8149 To = ImpCastExprToType(To.take(), 8150 Context.getCVRQualifiedType(BaseType, 8151 MoveAssignOperator->getTypeQualifiers()), 8152 CK_UncheckedDerivedToBase, 8153 VK_LValue, &BasePath); 8154 8155 // Build the move. 8156 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8157 To.get(), From, 8158 /*CopyingBaseSubobject=*/true, 8159 /*Copying=*/false); 8160 if (Move.isInvalid()) { 8161 Diag(CurrentLocation, diag::note_member_synthesized_at) 8162 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8163 MoveAssignOperator->setInvalidDecl(); 8164 return; 8165 } 8166 8167 // Success! Record the move. 8168 Statements.push_back(Move.takeAs<Expr>()); 8169 } 8170 8171 // \brief Reference to the __builtin_memcpy function. 8172 Expr *BuiltinMemCpyRef = 0; 8173 // \brief Reference to the __builtin_objc_memmove_collectable function. 8174 Expr *CollectableMemCpyRef = 0; 8175 8176 // Assign non-static members. 8177 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8178 FieldEnd = ClassDecl->field_end(); 8179 Field != FieldEnd; ++Field) { 8180 if (Field->isUnnamedBitfield()) 8181 continue; 8182 8183 // Check for members of reference type; we can't move those. 8184 if (Field->getType()->isReferenceType()) { 8185 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8186 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8187 Diag(Field->getLocation(), diag::note_declared_at); 8188 Diag(CurrentLocation, diag::note_member_synthesized_at) 8189 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8190 Invalid = true; 8191 continue; 8192 } 8193 8194 // Check for members of const-qualified, non-class type. 8195 QualType BaseType = Context.getBaseElementType(Field->getType()); 8196 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8197 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8198 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8199 Diag(Field->getLocation(), diag::note_declared_at); 8200 Diag(CurrentLocation, diag::note_member_synthesized_at) 8201 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8202 Invalid = true; 8203 continue; 8204 } 8205 8206 // Suppress assigning zero-width bitfields. 8207 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8208 continue; 8209 8210 QualType FieldType = Field->getType().getNonReferenceType(); 8211 if (FieldType->isIncompleteArrayType()) { 8212 assert(ClassDecl->hasFlexibleArrayMember() && 8213 "Incomplete array type is not valid"); 8214 continue; 8215 } 8216 8217 // Build references to the field in the object we're copying from and to. 8218 CXXScopeSpec SS; // Intentionally empty 8219 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8220 LookupMemberName); 8221 MemberLookup.addDecl(*Field); 8222 MemberLookup.resolveKind(); 8223 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8224 Loc, /*IsArrow=*/false, 8225 SS, SourceLocation(), 0, 8226 MemberLookup, 0); 8227 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8228 Loc, /*IsArrow=*/true, 8229 SS, SourceLocation(), 0, 8230 MemberLookup, 0); 8231 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8232 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8233 8234 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8235 "Member reference with rvalue base must be rvalue except for reference " 8236 "members, which aren't allowed for move assignment."); 8237 8238 // If the field should be copied with __builtin_memcpy rather than via 8239 // explicit assignments, do so. This optimization only applies for arrays 8240 // of scalars and arrays of class type with trivial move-assignment 8241 // operators. 8242 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8243 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8244 // Compute the size of the memory buffer to be copied. 8245 QualType SizeType = Context.getSizeType(); 8246 llvm::APInt Size(Context.getTypeSize(SizeType), 8247 Context.getTypeSizeInChars(BaseType).getQuantity()); 8248 for (const ConstantArrayType *Array 8249 = Context.getAsConstantArrayType(FieldType); 8250 Array; 8251 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8252 llvm::APInt ArraySize 8253 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8254 Size *= ArraySize; 8255 } 8256 8257 // Take the address of the field references for "from" and "to". We 8258 // directly construct UnaryOperators here because semantic analysis 8259 // does not permit us to take the address of an xvalue. 8260 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8261 Context.getPointerType(From.get()->getType()), 8262 VK_RValue, OK_Ordinary, Loc); 8263 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8264 Context.getPointerType(To.get()->getType()), 8265 VK_RValue, OK_Ordinary, Loc); 8266 8267 bool NeedsCollectableMemCpy = 8268 (BaseType->isRecordType() && 8269 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8270 8271 if (NeedsCollectableMemCpy) { 8272 if (!CollectableMemCpyRef) { 8273 // Create a reference to the __builtin_objc_memmove_collectable function. 8274 LookupResult R(*this, 8275 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8276 Loc, LookupOrdinaryName); 8277 LookupName(R, TUScope, true); 8278 8279 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8280 if (!CollectableMemCpy) { 8281 // Something went horribly wrong earlier, and we will have 8282 // complained about it. 8283 Invalid = true; 8284 continue; 8285 } 8286 8287 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8288 CollectableMemCpy->getType(), 8289 VK_LValue, Loc, 0).take(); 8290 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8291 } 8292 } 8293 // Create a reference to the __builtin_memcpy builtin function. 8294 else if (!BuiltinMemCpyRef) { 8295 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8296 LookupOrdinaryName); 8297 LookupName(R, TUScope, true); 8298 8299 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8300 if (!BuiltinMemCpy) { 8301 // Something went horribly wrong earlier, and we will have complained 8302 // about it. 8303 Invalid = true; 8304 continue; 8305 } 8306 8307 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8308 BuiltinMemCpy->getType(), 8309 VK_LValue, Loc, 0).take(); 8310 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8311 } 8312 8313 ASTOwningVector<Expr*> CallArgs(*this); 8314 CallArgs.push_back(To.takeAs<Expr>()); 8315 CallArgs.push_back(From.takeAs<Expr>()); 8316 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8317 ExprResult Call = ExprError(); 8318 if (NeedsCollectableMemCpy) 8319 Call = ActOnCallExpr(/*Scope=*/0, 8320 CollectableMemCpyRef, 8321 Loc, move_arg(CallArgs), 8322 Loc); 8323 else 8324 Call = ActOnCallExpr(/*Scope=*/0, 8325 BuiltinMemCpyRef, 8326 Loc, move_arg(CallArgs), 8327 Loc); 8328 8329 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8330 Statements.push_back(Call.takeAs<Expr>()); 8331 continue; 8332 } 8333 8334 // Build the move of this field. 8335 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8336 To.get(), From.get(), 8337 /*CopyingBaseSubobject=*/false, 8338 /*Copying=*/false); 8339 if (Move.isInvalid()) { 8340 Diag(CurrentLocation, diag::note_member_synthesized_at) 8341 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8342 MoveAssignOperator->setInvalidDecl(); 8343 return; 8344 } 8345 8346 // Success! Record the copy. 8347 Statements.push_back(Move.takeAs<Stmt>()); 8348 } 8349 8350 if (!Invalid) { 8351 // Add a "return *this;" 8352 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8353 8354 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8355 if (Return.isInvalid()) 8356 Invalid = true; 8357 else { 8358 Statements.push_back(Return.takeAs<Stmt>()); 8359 8360 if (Trap.hasErrorOccurred()) { 8361 Diag(CurrentLocation, diag::note_member_synthesized_at) 8362 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8363 Invalid = true; 8364 } 8365 } 8366 } 8367 8368 if (Invalid) { 8369 MoveAssignOperator->setInvalidDecl(); 8370 return; 8371 } 8372 8373 StmtResult Body; 8374 { 8375 CompoundScopeRAII CompoundScope(*this); 8376 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8377 /*isStmtExpr=*/false); 8378 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8379 } 8380 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8381 8382 if (ASTMutationListener *L = getASTMutationListener()) { 8383 L->CompletedImplicitDefinition(MoveAssignOperator); 8384 } 8385} 8386 8387std::pair<Sema::ImplicitExceptionSpecification, bool> 8388Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8389 if (ClassDecl->isInvalidDecl()) 8390 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8391 8392 // C++ [class.copy]p5: 8393 // The implicitly-declared copy constructor for a class X will 8394 // have the form 8395 // 8396 // X::X(const X&) 8397 // 8398 // if 8399 // FIXME: It ought to be possible to store this on the record. 8400 bool HasConstCopyConstructor = true; 8401 8402 // -- each direct or virtual base class B of X has a copy 8403 // constructor whose first parameter is of type const B& or 8404 // const volatile B&, and 8405 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8406 BaseEnd = ClassDecl->bases_end(); 8407 HasConstCopyConstructor && Base != BaseEnd; 8408 ++Base) { 8409 // Virtual bases are handled below. 8410 if (Base->isVirtual()) 8411 continue; 8412 8413 CXXRecordDecl *BaseClassDecl 8414 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8415 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8416 &HasConstCopyConstructor); 8417 } 8418 8419 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8420 BaseEnd = ClassDecl->vbases_end(); 8421 HasConstCopyConstructor && Base != BaseEnd; 8422 ++Base) { 8423 CXXRecordDecl *BaseClassDecl 8424 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8425 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8426 &HasConstCopyConstructor); 8427 } 8428 8429 // -- for all the nonstatic data members of X that are of a 8430 // class type M (or array thereof), each such class type 8431 // has a copy constructor whose first parameter is of type 8432 // const M& or const volatile M&. 8433 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8434 FieldEnd = ClassDecl->field_end(); 8435 HasConstCopyConstructor && Field != FieldEnd; 8436 ++Field) { 8437 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8438 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8439 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8440 &HasConstCopyConstructor); 8441 } 8442 } 8443 // Otherwise, the implicitly declared copy constructor will have 8444 // the form 8445 // 8446 // X::X(X&) 8447 8448 // C++ [except.spec]p14: 8449 // An implicitly declared special member function (Clause 12) shall have an 8450 // exception-specification. [...] 8451 ImplicitExceptionSpecification ExceptSpec(Context); 8452 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8453 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8454 BaseEnd = ClassDecl->bases_end(); 8455 Base != BaseEnd; 8456 ++Base) { 8457 // Virtual bases are handled below. 8458 if (Base->isVirtual()) 8459 continue; 8460 8461 CXXRecordDecl *BaseClassDecl 8462 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8463 if (CXXConstructorDecl *CopyConstructor = 8464 LookupCopyingConstructor(BaseClassDecl, Quals)) 8465 ExceptSpec.CalledDecl(CopyConstructor); 8466 } 8467 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8468 BaseEnd = ClassDecl->vbases_end(); 8469 Base != BaseEnd; 8470 ++Base) { 8471 CXXRecordDecl *BaseClassDecl 8472 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8473 if (CXXConstructorDecl *CopyConstructor = 8474 LookupCopyingConstructor(BaseClassDecl, Quals)) 8475 ExceptSpec.CalledDecl(CopyConstructor); 8476 } 8477 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8478 FieldEnd = ClassDecl->field_end(); 8479 Field != FieldEnd; 8480 ++Field) { 8481 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8482 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8483 if (CXXConstructorDecl *CopyConstructor = 8484 LookupCopyingConstructor(FieldClassDecl, Quals)) 8485 ExceptSpec.CalledDecl(CopyConstructor); 8486 } 8487 } 8488 8489 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8490} 8491 8492CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8493 CXXRecordDecl *ClassDecl) { 8494 // C++ [class.copy]p4: 8495 // If the class definition does not explicitly declare a copy 8496 // constructor, one is declared implicitly. 8497 8498 ImplicitExceptionSpecification Spec(Context); 8499 bool Const; 8500 llvm::tie(Spec, Const) = 8501 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8502 8503 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8504 QualType ArgType = ClassType; 8505 if (Const) 8506 ArgType = ArgType.withConst(); 8507 ArgType = Context.getLValueReferenceType(ArgType); 8508 8509 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8510 8511 DeclarationName Name 8512 = Context.DeclarationNames.getCXXConstructorName( 8513 Context.getCanonicalType(ClassType)); 8514 SourceLocation ClassLoc = ClassDecl->getLocation(); 8515 DeclarationNameInfo NameInfo(Name, ClassLoc); 8516 8517 // An implicitly-declared copy constructor is an inline public 8518 // member of its class. 8519 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8520 Context, ClassDecl, ClassLoc, NameInfo, 8521 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8522 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8523 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8524 getLangOptions().CPlusPlus0x); 8525 CopyConstructor->setAccess(AS_public); 8526 CopyConstructor->setDefaulted(); 8527 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8528 8529 // Note that we have declared this constructor. 8530 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8531 8532 // Add the parameter to the constructor. 8533 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8534 ClassLoc, ClassLoc, 8535 /*IdentifierInfo=*/0, 8536 ArgType, /*TInfo=*/0, 8537 SC_None, 8538 SC_None, 0); 8539 CopyConstructor->setParams(FromParam); 8540 8541 if (Scope *S = getScopeForContext(ClassDecl)) 8542 PushOnScopeChains(CopyConstructor, S, false); 8543 ClassDecl->addDecl(CopyConstructor); 8544 8545 // C++11 [class.copy]p8: 8546 // ... If the class definition does not explicitly declare a copy 8547 // constructor, there is no user-declared move constructor, and there is no 8548 // user-declared move assignment operator, a copy constructor is implicitly 8549 // declared as defaulted. 8550 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8551 (ClassDecl->hasUserDeclaredMoveAssignment() && 8552 !getLangOptions().MicrosoftMode) || 8553 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8554 CopyConstructor->setDeletedAsWritten(); 8555 8556 return CopyConstructor; 8557} 8558 8559void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8560 CXXConstructorDecl *CopyConstructor) { 8561 assert((CopyConstructor->isDefaulted() && 8562 CopyConstructor->isCopyConstructor() && 8563 !CopyConstructor->doesThisDeclarationHaveABody()) && 8564 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8565 8566 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8567 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8568 8569 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8570 DiagnosticErrorTrap Trap(Diags); 8571 8572 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8573 Trap.hasErrorOccurred()) { 8574 Diag(CurrentLocation, diag::note_member_synthesized_at) 8575 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8576 CopyConstructor->setInvalidDecl(); 8577 } else { 8578 Sema::CompoundScopeRAII CompoundScope(*this); 8579 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8580 CopyConstructor->getLocation(), 8581 MultiStmtArg(*this, 0, 0), 8582 /*isStmtExpr=*/false) 8583 .takeAs<Stmt>()); 8584 CopyConstructor->setImplicitlyDefined(true); 8585 } 8586 8587 CopyConstructor->setUsed(); 8588 if (ASTMutationListener *L = getASTMutationListener()) { 8589 L->CompletedImplicitDefinition(CopyConstructor); 8590 } 8591} 8592 8593Sema::ImplicitExceptionSpecification 8594Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8595 // C++ [except.spec]p14: 8596 // An implicitly declared special member function (Clause 12) shall have an 8597 // exception-specification. [...] 8598 ImplicitExceptionSpecification ExceptSpec(Context); 8599 if (ClassDecl->isInvalidDecl()) 8600 return ExceptSpec; 8601 8602 // Direct base-class constructors. 8603 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8604 BEnd = ClassDecl->bases_end(); 8605 B != BEnd; ++B) { 8606 if (B->isVirtual()) // Handled below. 8607 continue; 8608 8609 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8610 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8611 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8612 // If this is a deleted function, add it anyway. This might be conformant 8613 // with the standard. This might not. I'm not sure. It might not matter. 8614 if (Constructor) 8615 ExceptSpec.CalledDecl(Constructor); 8616 } 8617 } 8618 8619 // Virtual base-class constructors. 8620 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8621 BEnd = ClassDecl->vbases_end(); 8622 B != BEnd; ++B) { 8623 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8624 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8625 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8626 // If this is a deleted function, add it anyway. This might be conformant 8627 // with the standard. This might not. I'm not sure. It might not matter. 8628 if (Constructor) 8629 ExceptSpec.CalledDecl(Constructor); 8630 } 8631 } 8632 8633 // Field constructors. 8634 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8635 FEnd = ClassDecl->field_end(); 8636 F != FEnd; ++F) { 8637 if (const RecordType *RecordTy 8638 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8639 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8640 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8641 // If this is a deleted function, add it anyway. This might be conformant 8642 // with the standard. This might not. I'm not sure. It might not matter. 8643 // In particular, the problem is that this function never gets called. It 8644 // might just be ill-formed because this function attempts to refer to 8645 // a deleted function here. 8646 if (Constructor) 8647 ExceptSpec.CalledDecl(Constructor); 8648 } 8649 } 8650 8651 return ExceptSpec; 8652} 8653 8654CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8655 CXXRecordDecl *ClassDecl) { 8656 ImplicitExceptionSpecification Spec( 8657 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8658 8659 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8660 QualType ArgType = Context.getRValueReferenceType(ClassType); 8661 8662 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8663 8664 DeclarationName Name 8665 = Context.DeclarationNames.getCXXConstructorName( 8666 Context.getCanonicalType(ClassType)); 8667 SourceLocation ClassLoc = ClassDecl->getLocation(); 8668 DeclarationNameInfo NameInfo(Name, ClassLoc); 8669 8670 // C++0x [class.copy]p11: 8671 // An implicitly-declared copy/move constructor is an inline public 8672 // member of its class. 8673 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8674 Context, ClassDecl, ClassLoc, NameInfo, 8675 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8676 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8677 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8678 getLangOptions().CPlusPlus0x); 8679 MoveConstructor->setAccess(AS_public); 8680 MoveConstructor->setDefaulted(); 8681 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8682 8683 // Add the parameter to the constructor. 8684 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8685 ClassLoc, ClassLoc, 8686 /*IdentifierInfo=*/0, 8687 ArgType, /*TInfo=*/0, 8688 SC_None, 8689 SC_None, 0); 8690 MoveConstructor->setParams(FromParam); 8691 8692 // C++0x [class.copy]p9: 8693 // If the definition of a class X does not explicitly declare a move 8694 // constructor, one will be implicitly declared as defaulted if and only if: 8695 // [...] 8696 // - the move constructor would not be implicitly defined as deleted. 8697 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8698 // Cache this result so that we don't try to generate this over and over 8699 // on every lookup, leaking memory and wasting time. 8700 ClassDecl->setFailedImplicitMoveConstructor(); 8701 return 0; 8702 } 8703 8704 // Note that we have declared this constructor. 8705 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8706 8707 if (Scope *S = getScopeForContext(ClassDecl)) 8708 PushOnScopeChains(MoveConstructor, S, false); 8709 ClassDecl->addDecl(MoveConstructor); 8710 8711 return MoveConstructor; 8712} 8713 8714void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8715 CXXConstructorDecl *MoveConstructor) { 8716 assert((MoveConstructor->isDefaulted() && 8717 MoveConstructor->isMoveConstructor() && 8718 !MoveConstructor->doesThisDeclarationHaveABody()) && 8719 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8720 8721 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8722 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8723 8724 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8725 DiagnosticErrorTrap Trap(Diags); 8726 8727 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8728 Trap.hasErrorOccurred()) { 8729 Diag(CurrentLocation, diag::note_member_synthesized_at) 8730 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8731 MoveConstructor->setInvalidDecl(); 8732 } else { 8733 Sema::CompoundScopeRAII CompoundScope(*this); 8734 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8735 MoveConstructor->getLocation(), 8736 MultiStmtArg(*this, 0, 0), 8737 /*isStmtExpr=*/false) 8738 .takeAs<Stmt>()); 8739 MoveConstructor->setImplicitlyDefined(true); 8740 } 8741 8742 MoveConstructor->setUsed(); 8743 8744 if (ASTMutationListener *L = getASTMutationListener()) { 8745 L->CompletedImplicitDefinition(MoveConstructor); 8746 } 8747} 8748 8749bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8750 return FD->isDeleted() && 8751 (FD->isDefaulted() || FD->isImplicit()) && 8752 isa<CXXMethodDecl>(FD); 8753} 8754 8755/// \brief Mark the call operator of the given lambda closure type as "used". 8756static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8757 CXXMethodDecl *CallOperator 8758 = cast<CXXMethodDecl>( 8759 *Lambda->lookup( 8760 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8761 CallOperator->setReferenced(); 8762 CallOperator->setUsed(); 8763} 8764 8765void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8766 SourceLocation CurrentLocation, 8767 CXXConversionDecl *Conv) 8768{ 8769 CXXRecordDecl *Lambda = Conv->getParent(); 8770 8771 // Make sure that the lambda call operator is marked used. 8772 markLambdaCallOperatorUsed(*this, Lambda); 8773 8774 Conv->setUsed(); 8775 8776 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8777 DiagnosticErrorTrap Trap(Diags); 8778 8779 // Return the address of the __invoke function. 8780 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8781 CXXMethodDecl *Invoke 8782 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8783 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8784 VK_LValue, Conv->getLocation()).take(); 8785 assert(FunctionRef && "Can't refer to __invoke function?"); 8786 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8787 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8788 Conv->getLocation(), 8789 Conv->getLocation())); 8790 8791 // Fill in the __invoke function with a dummy implementation. IR generation 8792 // will fill in the actual details. 8793 Invoke->setUsed(); 8794 Invoke->setReferenced(); 8795 Invoke->setBody(new (Context) CompoundStmt(Context, 0, 0, Conv->getLocation(), 8796 Conv->getLocation())); 8797 8798 if (ASTMutationListener *L = getASTMutationListener()) { 8799 L->CompletedImplicitDefinition(Conv); 8800 L->CompletedImplicitDefinition(Invoke); 8801 } 8802} 8803 8804void Sema::DefineImplicitLambdaToBlockPointerConversion( 8805 SourceLocation CurrentLocation, 8806 CXXConversionDecl *Conv) 8807{ 8808 CXXRecordDecl *Lambda = Conv->getParent(); 8809 8810 // Make sure that the lambda call operator is marked used. 8811 CXXMethodDecl *CallOperator 8812 = cast<CXXMethodDecl>( 8813 *Lambda->lookup( 8814 Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8815 CallOperator->setReferenced(); 8816 CallOperator->setUsed(); 8817 Conv->setUsed(); 8818 8819 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8820 DiagnosticErrorTrap Trap(Diags); 8821 8822 // Copy-initialize the lambda object as needed to capture it. 8823 Expr *This = ActOnCXXThis(CurrentLocation).take(); 8824 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 8825 ExprResult Init = PerformCopyInitialization( 8826 InitializedEntity::InitializeBlock(CurrentLocation, 8827 DerefThis->getType(), 8828 /*NRVO=*/false), 8829 CurrentLocation, DerefThis); 8830 if (!Init.isInvalid()) 8831 Init = ActOnFinishFullExpr(Init.take()); 8832 8833 if (Init.isInvalid()) { 8834 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8835 Conv->setInvalidDecl(); 8836 return; 8837 } 8838 8839 // Create the new block to be returned. 8840 BlockDecl *Block = BlockDecl::Create(Context, Conv, Conv->getLocation()); 8841 8842 // Set the type information. 8843 Block->setSignatureAsWritten(CallOperator->getTypeSourceInfo()); 8844 Block->setIsVariadic(CallOperator->isVariadic()); 8845 Block->setBlockMissingReturnType(false); 8846 8847 // Add parameters. 8848 SmallVector<ParmVarDecl *, 4> BlockParams; 8849 for (unsigned I = 0, N = CallOperator->getNumParams(); I != N; ++I) { 8850 ParmVarDecl *From = CallOperator->getParamDecl(I); 8851 BlockParams.push_back(ParmVarDecl::Create(Context, Block, 8852 From->getLocStart(), 8853 From->getLocation(), 8854 From->getIdentifier(), 8855 From->getType(), 8856 From->getTypeSourceInfo(), 8857 From->getStorageClass(), 8858 From->getStorageClassAsWritten(), 8859 /*DefaultArg=*/0)); 8860 } 8861 Block->setParams(BlockParams); 8862 8863 // Add capture. The capture is uses a fake (NULL) variable, since we don't 8864 // actually want to have to name a capture variable. However, the 8865 // initializer copy-initializes the lambda object. 8866 BlockDecl::Capture Capture(/*Variable=*/0, /*ByRef=*/false, /*Nested=*/false, 8867 /*Copy=*/Init.take()); 8868 Block->setCaptures(Context, &Capture, &Capture + 1, 8869 /*CapturesCXXThis=*/false); 8870 8871 // Add a fake function body to the block. IR generation is responsible 8872 // for filling in the actual body, which cannot be expressed as an AST. 8873 Block->setBody(new (Context) CompoundStmt(Context, 0, 0, 8874 Conv->getLocation(), 8875 Conv->getLocation())); 8876 8877 // Create the block literal expression. 8878 Expr *BuildBlock = new (Context) BlockExpr(Block, Conv->getConversionType()); 8879 ExprCleanupObjects.push_back(Block); 8880 ExprNeedsCleanups = true; 8881 8882 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 8883 // behavior. 8884 if (!getLangOptions().ObjCAutoRefCount) 8885 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock->getType(), 8886 CK_CopyAndAutoreleaseBlockObject, 8887 BuildBlock, 0, VK_RValue); 8888 8889 // Create the return statement that returns the block from the conversion 8890 // function. 8891 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock); 8892 if (Return.isInvalid()) { 8893 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8894 Conv->setInvalidDecl(); 8895 return; 8896 } 8897 8898 // Set the body of the conversion function. 8899 Stmt *ReturnS = Return.take(); 8900 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 8901 Conv->getLocation(), 8902 Conv->getLocation())); 8903 8904 // We're done; notify the mutation listener, if any. 8905 if (ASTMutationListener *L = getASTMutationListener()) { 8906 L->CompletedImplicitDefinition(Conv); 8907 } 8908} 8909 8910ExprResult 8911Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8912 CXXConstructorDecl *Constructor, 8913 MultiExprArg ExprArgs, 8914 bool HadMultipleCandidates, 8915 bool RequiresZeroInit, 8916 unsigned ConstructKind, 8917 SourceRange ParenRange) { 8918 bool Elidable = false; 8919 8920 // C++0x [class.copy]p34: 8921 // When certain criteria are met, an implementation is allowed to 8922 // omit the copy/move construction of a class object, even if the 8923 // copy/move constructor and/or destructor for the object have 8924 // side effects. [...] 8925 // - when a temporary class object that has not been bound to a 8926 // reference (12.2) would be copied/moved to a class object 8927 // with the same cv-unqualified type, the copy/move operation 8928 // can be omitted by constructing the temporary object 8929 // directly into the target of the omitted copy/move 8930 if (ConstructKind == CXXConstructExpr::CK_Complete && 8931 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8932 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8933 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8934 } 8935 8936 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8937 Elidable, move(ExprArgs), HadMultipleCandidates, 8938 RequiresZeroInit, ConstructKind, ParenRange); 8939} 8940 8941/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8942/// including handling of its default argument expressions. 8943ExprResult 8944Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8945 CXXConstructorDecl *Constructor, bool Elidable, 8946 MultiExprArg ExprArgs, 8947 bool HadMultipleCandidates, 8948 bool RequiresZeroInit, 8949 unsigned ConstructKind, 8950 SourceRange ParenRange) { 8951 unsigned NumExprs = ExprArgs.size(); 8952 Expr **Exprs = (Expr **)ExprArgs.release(); 8953 8954 for (specific_attr_iterator<NonNullAttr> 8955 i = Constructor->specific_attr_begin<NonNullAttr>(), 8956 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8957 const NonNullAttr *NonNull = *i; 8958 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8959 } 8960 8961 MarkFunctionReferenced(ConstructLoc, Constructor); 8962 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8963 Constructor, Elidable, Exprs, NumExprs, 8964 HadMultipleCandidates, /*FIXME*/false, 8965 RequiresZeroInit, 8966 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8967 ParenRange)); 8968} 8969 8970bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8971 CXXConstructorDecl *Constructor, 8972 MultiExprArg Exprs, 8973 bool HadMultipleCandidates) { 8974 // FIXME: Provide the correct paren SourceRange when available. 8975 ExprResult TempResult = 8976 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8977 move(Exprs), HadMultipleCandidates, false, 8978 CXXConstructExpr::CK_Complete, SourceRange()); 8979 if (TempResult.isInvalid()) 8980 return true; 8981 8982 Expr *Temp = TempResult.takeAs<Expr>(); 8983 CheckImplicitConversions(Temp, VD->getLocation()); 8984 MarkFunctionReferenced(VD->getLocation(), Constructor); 8985 Temp = MaybeCreateExprWithCleanups(Temp); 8986 VD->setInit(Temp); 8987 8988 return false; 8989} 8990 8991void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8992 if (VD->isInvalidDecl()) return; 8993 8994 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8995 if (ClassDecl->isInvalidDecl()) return; 8996 if (ClassDecl->hasIrrelevantDestructor()) return; 8997 if (ClassDecl->isDependentContext()) return; 8998 8999 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9000 MarkFunctionReferenced(VD->getLocation(), Destructor); 9001 CheckDestructorAccess(VD->getLocation(), Destructor, 9002 PDiag(diag::err_access_dtor_var) 9003 << VD->getDeclName() 9004 << VD->getType()); 9005 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9006 9007 if (!VD->hasGlobalStorage()) return; 9008 9009 // Emit warning for non-trivial dtor in global scope (a real global, 9010 // class-static, function-static). 9011 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9012 9013 // TODO: this should be re-enabled for static locals by !CXAAtExit 9014 if (!VD->isStaticLocal()) 9015 Diag(VD->getLocation(), diag::warn_global_destructor); 9016} 9017 9018/// \brief Given a constructor and the set of arguments provided for the 9019/// constructor, convert the arguments and add any required default arguments 9020/// to form a proper call to this constructor. 9021/// 9022/// \returns true if an error occurred, false otherwise. 9023bool 9024Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9025 MultiExprArg ArgsPtr, 9026 SourceLocation Loc, 9027 ASTOwningVector<Expr*> &ConvertedArgs) { 9028 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9029 unsigned NumArgs = ArgsPtr.size(); 9030 Expr **Args = (Expr **)ArgsPtr.get(); 9031 9032 const FunctionProtoType *Proto 9033 = Constructor->getType()->getAs<FunctionProtoType>(); 9034 assert(Proto && "Constructor without a prototype?"); 9035 unsigned NumArgsInProto = Proto->getNumArgs(); 9036 9037 // If too few arguments are available, we'll fill in the rest with defaults. 9038 if (NumArgs < NumArgsInProto) 9039 ConvertedArgs.reserve(NumArgsInProto); 9040 else 9041 ConvertedArgs.reserve(NumArgs); 9042 9043 VariadicCallType CallType = 9044 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9045 SmallVector<Expr *, 8> AllArgs; 9046 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9047 Proto, 0, Args, NumArgs, AllArgs, 9048 CallType); 9049 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9050 9051 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9052 9053 // FIXME: Missing call to CheckFunctionCall or equivalent 9054 9055 return Invalid; 9056} 9057 9058static inline bool 9059CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9060 const FunctionDecl *FnDecl) { 9061 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9062 if (isa<NamespaceDecl>(DC)) { 9063 return SemaRef.Diag(FnDecl->getLocation(), 9064 diag::err_operator_new_delete_declared_in_namespace) 9065 << FnDecl->getDeclName(); 9066 } 9067 9068 if (isa<TranslationUnitDecl>(DC) && 9069 FnDecl->getStorageClass() == SC_Static) { 9070 return SemaRef.Diag(FnDecl->getLocation(), 9071 diag::err_operator_new_delete_declared_static) 9072 << FnDecl->getDeclName(); 9073 } 9074 9075 return false; 9076} 9077 9078static inline bool 9079CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9080 CanQualType ExpectedResultType, 9081 CanQualType ExpectedFirstParamType, 9082 unsigned DependentParamTypeDiag, 9083 unsigned InvalidParamTypeDiag) { 9084 QualType ResultType = 9085 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9086 9087 // Check that the result type is not dependent. 9088 if (ResultType->isDependentType()) 9089 return SemaRef.Diag(FnDecl->getLocation(), 9090 diag::err_operator_new_delete_dependent_result_type) 9091 << FnDecl->getDeclName() << ExpectedResultType; 9092 9093 // Check that the result type is what we expect. 9094 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9095 return SemaRef.Diag(FnDecl->getLocation(), 9096 diag::err_operator_new_delete_invalid_result_type) 9097 << FnDecl->getDeclName() << ExpectedResultType; 9098 9099 // A function template must have at least 2 parameters. 9100 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9101 return SemaRef.Diag(FnDecl->getLocation(), 9102 diag::err_operator_new_delete_template_too_few_parameters) 9103 << FnDecl->getDeclName(); 9104 9105 // The function decl must have at least 1 parameter. 9106 if (FnDecl->getNumParams() == 0) 9107 return SemaRef.Diag(FnDecl->getLocation(), 9108 diag::err_operator_new_delete_too_few_parameters) 9109 << FnDecl->getDeclName(); 9110 9111 // Check the the first parameter type is not dependent. 9112 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9113 if (FirstParamType->isDependentType()) 9114 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9115 << FnDecl->getDeclName() << ExpectedFirstParamType; 9116 9117 // Check that the first parameter type is what we expect. 9118 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9119 ExpectedFirstParamType) 9120 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9121 << FnDecl->getDeclName() << ExpectedFirstParamType; 9122 9123 return false; 9124} 9125 9126static bool 9127CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9128 // C++ [basic.stc.dynamic.allocation]p1: 9129 // A program is ill-formed if an allocation function is declared in a 9130 // namespace scope other than global scope or declared static in global 9131 // scope. 9132 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9133 return true; 9134 9135 CanQualType SizeTy = 9136 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9137 9138 // C++ [basic.stc.dynamic.allocation]p1: 9139 // The return type shall be void*. The first parameter shall have type 9140 // std::size_t. 9141 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9142 SizeTy, 9143 diag::err_operator_new_dependent_param_type, 9144 diag::err_operator_new_param_type)) 9145 return true; 9146 9147 // C++ [basic.stc.dynamic.allocation]p1: 9148 // The first parameter shall not have an associated default argument. 9149 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9150 return SemaRef.Diag(FnDecl->getLocation(), 9151 diag::err_operator_new_default_arg) 9152 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9153 9154 return false; 9155} 9156 9157static bool 9158CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9159 // C++ [basic.stc.dynamic.deallocation]p1: 9160 // A program is ill-formed if deallocation functions are declared in a 9161 // namespace scope other than global scope or declared static in global 9162 // scope. 9163 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9164 return true; 9165 9166 // C++ [basic.stc.dynamic.deallocation]p2: 9167 // Each deallocation function shall return void and its first parameter 9168 // shall be void*. 9169 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9170 SemaRef.Context.VoidPtrTy, 9171 diag::err_operator_delete_dependent_param_type, 9172 diag::err_operator_delete_param_type)) 9173 return true; 9174 9175 return false; 9176} 9177 9178/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9179/// of this overloaded operator is well-formed. If so, returns false; 9180/// otherwise, emits appropriate diagnostics and returns true. 9181bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9182 assert(FnDecl && FnDecl->isOverloadedOperator() && 9183 "Expected an overloaded operator declaration"); 9184 9185 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9186 9187 // C++ [over.oper]p5: 9188 // The allocation and deallocation functions, operator new, 9189 // operator new[], operator delete and operator delete[], are 9190 // described completely in 3.7.3. The attributes and restrictions 9191 // found in the rest of this subclause do not apply to them unless 9192 // explicitly stated in 3.7.3. 9193 if (Op == OO_Delete || Op == OO_Array_Delete) 9194 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9195 9196 if (Op == OO_New || Op == OO_Array_New) 9197 return CheckOperatorNewDeclaration(*this, FnDecl); 9198 9199 // C++ [over.oper]p6: 9200 // An operator function shall either be a non-static member 9201 // function or be a non-member function and have at least one 9202 // parameter whose type is a class, a reference to a class, an 9203 // enumeration, or a reference to an enumeration. 9204 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9205 if (MethodDecl->isStatic()) 9206 return Diag(FnDecl->getLocation(), 9207 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9208 } else { 9209 bool ClassOrEnumParam = false; 9210 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9211 ParamEnd = FnDecl->param_end(); 9212 Param != ParamEnd; ++Param) { 9213 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9214 if (ParamType->isDependentType() || ParamType->isRecordType() || 9215 ParamType->isEnumeralType()) { 9216 ClassOrEnumParam = true; 9217 break; 9218 } 9219 } 9220 9221 if (!ClassOrEnumParam) 9222 return Diag(FnDecl->getLocation(), 9223 diag::err_operator_overload_needs_class_or_enum) 9224 << FnDecl->getDeclName(); 9225 } 9226 9227 // C++ [over.oper]p8: 9228 // An operator function cannot have default arguments (8.3.6), 9229 // except where explicitly stated below. 9230 // 9231 // Only the function-call operator allows default arguments 9232 // (C++ [over.call]p1). 9233 if (Op != OO_Call) { 9234 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9235 Param != FnDecl->param_end(); ++Param) { 9236 if ((*Param)->hasDefaultArg()) 9237 return Diag((*Param)->getLocation(), 9238 diag::err_operator_overload_default_arg) 9239 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9240 } 9241 } 9242 9243 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9244 { false, false, false } 9245#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9246 , { Unary, Binary, MemberOnly } 9247#include "clang/Basic/OperatorKinds.def" 9248 }; 9249 9250 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9251 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9252 bool MustBeMemberOperator = OperatorUses[Op][2]; 9253 9254 // C++ [over.oper]p8: 9255 // [...] Operator functions cannot have more or fewer parameters 9256 // than the number required for the corresponding operator, as 9257 // described in the rest of this subclause. 9258 unsigned NumParams = FnDecl->getNumParams() 9259 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9260 if (Op != OO_Call && 9261 ((NumParams == 1 && !CanBeUnaryOperator) || 9262 (NumParams == 2 && !CanBeBinaryOperator) || 9263 (NumParams < 1) || (NumParams > 2))) { 9264 // We have the wrong number of parameters. 9265 unsigned ErrorKind; 9266 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9267 ErrorKind = 2; // 2 -> unary or binary. 9268 } else if (CanBeUnaryOperator) { 9269 ErrorKind = 0; // 0 -> unary 9270 } else { 9271 assert(CanBeBinaryOperator && 9272 "All non-call overloaded operators are unary or binary!"); 9273 ErrorKind = 1; // 1 -> binary 9274 } 9275 9276 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9277 << FnDecl->getDeclName() << NumParams << ErrorKind; 9278 } 9279 9280 // Overloaded operators other than operator() cannot be variadic. 9281 if (Op != OO_Call && 9282 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9283 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9284 << FnDecl->getDeclName(); 9285 } 9286 9287 // Some operators must be non-static member functions. 9288 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9289 return Diag(FnDecl->getLocation(), 9290 diag::err_operator_overload_must_be_member) 9291 << FnDecl->getDeclName(); 9292 } 9293 9294 // C++ [over.inc]p1: 9295 // The user-defined function called operator++ implements the 9296 // prefix and postfix ++ operator. If this function is a member 9297 // function with no parameters, or a non-member function with one 9298 // parameter of class or enumeration type, it defines the prefix 9299 // increment operator ++ for objects of that type. If the function 9300 // is a member function with one parameter (which shall be of type 9301 // int) or a non-member function with two parameters (the second 9302 // of which shall be of type int), it defines the postfix 9303 // increment operator ++ for objects of that type. 9304 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9305 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9306 bool ParamIsInt = false; 9307 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9308 ParamIsInt = BT->getKind() == BuiltinType::Int; 9309 9310 if (!ParamIsInt) 9311 return Diag(LastParam->getLocation(), 9312 diag::err_operator_overload_post_incdec_must_be_int) 9313 << LastParam->getType() << (Op == OO_MinusMinus); 9314 } 9315 9316 return false; 9317} 9318 9319/// CheckLiteralOperatorDeclaration - Check whether the declaration 9320/// of this literal operator function is well-formed. If so, returns 9321/// false; otherwise, emits appropriate diagnostics and returns true. 9322bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9323 DeclContext *DC = FnDecl->getDeclContext(); 9324 Decl::Kind Kind = DC->getDeclKind(); 9325 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9326 Kind != Decl::LinkageSpec) { 9327 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9328 << FnDecl->getDeclName(); 9329 return true; 9330 } 9331 9332 bool Valid = false; 9333 9334 // template <char...> type operator "" name() is the only valid template 9335 // signature, and the only valid signature with no parameters. 9336 if (FnDecl->param_size() == 0) { 9337 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9338 // Must have only one template parameter 9339 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9340 if (Params->size() == 1) { 9341 NonTypeTemplateParmDecl *PmDecl = 9342 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9343 9344 // The template parameter must be a char parameter pack. 9345 if (PmDecl && PmDecl->isTemplateParameterPack() && 9346 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9347 Valid = true; 9348 } 9349 } 9350 } else { 9351 // Check the first parameter 9352 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9353 9354 QualType T = (*Param)->getType(); 9355 9356 // unsigned long long int, long double, and any character type are allowed 9357 // as the only parameters. 9358 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9359 Context.hasSameType(T, Context.LongDoubleTy) || 9360 Context.hasSameType(T, Context.CharTy) || 9361 Context.hasSameType(T, Context.WCharTy) || 9362 Context.hasSameType(T, Context.Char16Ty) || 9363 Context.hasSameType(T, Context.Char32Ty)) { 9364 if (++Param == FnDecl->param_end()) 9365 Valid = true; 9366 goto FinishedParams; 9367 } 9368 9369 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9370 const PointerType *PT = T->getAs<PointerType>(); 9371 if (!PT) 9372 goto FinishedParams; 9373 T = PT->getPointeeType(); 9374 if (!T.isConstQualified()) 9375 goto FinishedParams; 9376 T = T.getUnqualifiedType(); 9377 9378 // Move on to the second parameter; 9379 ++Param; 9380 9381 // If there is no second parameter, the first must be a const char * 9382 if (Param == FnDecl->param_end()) { 9383 if (Context.hasSameType(T, Context.CharTy)) 9384 Valid = true; 9385 goto FinishedParams; 9386 } 9387 9388 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9389 // are allowed as the first parameter to a two-parameter function 9390 if (!(Context.hasSameType(T, Context.CharTy) || 9391 Context.hasSameType(T, Context.WCharTy) || 9392 Context.hasSameType(T, Context.Char16Ty) || 9393 Context.hasSameType(T, Context.Char32Ty))) 9394 goto FinishedParams; 9395 9396 // The second and final parameter must be an std::size_t 9397 T = (*Param)->getType().getUnqualifiedType(); 9398 if (Context.hasSameType(T, Context.getSizeType()) && 9399 ++Param == FnDecl->param_end()) 9400 Valid = true; 9401 } 9402 9403 // FIXME: This diagnostic is absolutely terrible. 9404FinishedParams: 9405 if (!Valid) { 9406 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9407 << FnDecl->getDeclName(); 9408 return true; 9409 } 9410 9411 StringRef LiteralName 9412 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9413 if (LiteralName[0] != '_') { 9414 // C++0x [usrlit.suffix]p1: 9415 // Literal suffix identifiers that do not start with an underscore are 9416 // reserved for future standardization. 9417 bool IsHexFloat = true; 9418 if (LiteralName.size() > 1 && 9419 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9420 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9421 if (!isdigit(LiteralName[I])) { 9422 IsHexFloat = false; 9423 break; 9424 } 9425 } 9426 } 9427 9428 if (IsHexFloat) 9429 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9430 << LiteralName; 9431 else 9432 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9433 } 9434 9435 return false; 9436} 9437 9438/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9439/// linkage specification, including the language and (if present) 9440/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9441/// the location of the language string literal, which is provided 9442/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9443/// the '{' brace. Otherwise, this linkage specification does not 9444/// have any braces. 9445Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9446 SourceLocation LangLoc, 9447 StringRef Lang, 9448 SourceLocation LBraceLoc) { 9449 LinkageSpecDecl::LanguageIDs Language; 9450 if (Lang == "\"C\"") 9451 Language = LinkageSpecDecl::lang_c; 9452 else if (Lang == "\"C++\"") 9453 Language = LinkageSpecDecl::lang_cxx; 9454 else { 9455 Diag(LangLoc, diag::err_bad_language); 9456 return 0; 9457 } 9458 9459 // FIXME: Add all the various semantics of linkage specifications 9460 9461 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9462 ExternLoc, LangLoc, Language); 9463 CurContext->addDecl(D); 9464 PushDeclContext(S, D); 9465 return D; 9466} 9467 9468/// ActOnFinishLinkageSpecification - Complete the definition of 9469/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9470/// valid, it's the position of the closing '}' brace in a linkage 9471/// specification that uses braces. 9472Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9473 Decl *LinkageSpec, 9474 SourceLocation RBraceLoc) { 9475 if (LinkageSpec) { 9476 if (RBraceLoc.isValid()) { 9477 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9478 LSDecl->setRBraceLoc(RBraceLoc); 9479 } 9480 PopDeclContext(); 9481 } 9482 return LinkageSpec; 9483} 9484 9485/// \brief Perform semantic analysis for the variable declaration that 9486/// occurs within a C++ catch clause, returning the newly-created 9487/// variable. 9488VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9489 TypeSourceInfo *TInfo, 9490 SourceLocation StartLoc, 9491 SourceLocation Loc, 9492 IdentifierInfo *Name) { 9493 bool Invalid = false; 9494 QualType ExDeclType = TInfo->getType(); 9495 9496 // Arrays and functions decay. 9497 if (ExDeclType->isArrayType()) 9498 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9499 else if (ExDeclType->isFunctionType()) 9500 ExDeclType = Context.getPointerType(ExDeclType); 9501 9502 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9503 // The exception-declaration shall not denote a pointer or reference to an 9504 // incomplete type, other than [cv] void*. 9505 // N2844 forbids rvalue references. 9506 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9507 Diag(Loc, diag::err_catch_rvalue_ref); 9508 Invalid = true; 9509 } 9510 9511 QualType BaseType = ExDeclType; 9512 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9513 unsigned DK = diag::err_catch_incomplete; 9514 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9515 BaseType = Ptr->getPointeeType(); 9516 Mode = 1; 9517 DK = diag::err_catch_incomplete_ptr; 9518 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9519 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9520 BaseType = Ref->getPointeeType(); 9521 Mode = 2; 9522 DK = diag::err_catch_incomplete_ref; 9523 } 9524 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9525 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9526 Invalid = true; 9527 9528 if (!Invalid && !ExDeclType->isDependentType() && 9529 RequireNonAbstractType(Loc, ExDeclType, 9530 diag::err_abstract_type_in_decl, 9531 AbstractVariableType)) 9532 Invalid = true; 9533 9534 // Only the non-fragile NeXT runtime currently supports C++ catches 9535 // of ObjC types, and no runtime supports catching ObjC types by value. 9536 if (!Invalid && getLangOptions().ObjC1) { 9537 QualType T = ExDeclType; 9538 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9539 T = RT->getPointeeType(); 9540 9541 if (T->isObjCObjectType()) { 9542 Diag(Loc, diag::err_objc_object_catch); 9543 Invalid = true; 9544 } else if (T->isObjCObjectPointerType()) { 9545 if (!getLangOptions().ObjCNonFragileABI) 9546 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9547 } 9548 } 9549 9550 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9551 ExDeclType, TInfo, SC_None, SC_None); 9552 ExDecl->setExceptionVariable(true); 9553 9554 // In ARC, infer 'retaining' for variables of retainable type. 9555 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9556 Invalid = true; 9557 9558 if (!Invalid && !ExDeclType->isDependentType()) { 9559 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9560 // C++ [except.handle]p16: 9561 // The object declared in an exception-declaration or, if the 9562 // exception-declaration does not specify a name, a temporary (12.2) is 9563 // copy-initialized (8.5) from the exception object. [...] 9564 // The object is destroyed when the handler exits, after the destruction 9565 // of any automatic objects initialized within the handler. 9566 // 9567 // We just pretend to initialize the object with itself, then make sure 9568 // it can be destroyed later. 9569 QualType initType = ExDeclType; 9570 9571 InitializedEntity entity = 9572 InitializedEntity::InitializeVariable(ExDecl); 9573 InitializationKind initKind = 9574 InitializationKind::CreateCopy(Loc, SourceLocation()); 9575 9576 Expr *opaqueValue = 9577 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9578 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9579 ExprResult result = sequence.Perform(*this, entity, initKind, 9580 MultiExprArg(&opaqueValue, 1)); 9581 if (result.isInvalid()) 9582 Invalid = true; 9583 else { 9584 // If the constructor used was non-trivial, set this as the 9585 // "initializer". 9586 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9587 if (!construct->getConstructor()->isTrivial()) { 9588 Expr *init = MaybeCreateExprWithCleanups(construct); 9589 ExDecl->setInit(init); 9590 } 9591 9592 // And make sure it's destructable. 9593 FinalizeVarWithDestructor(ExDecl, recordType); 9594 } 9595 } 9596 } 9597 9598 if (Invalid) 9599 ExDecl->setInvalidDecl(); 9600 9601 return ExDecl; 9602} 9603 9604/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9605/// handler. 9606Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9607 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9608 bool Invalid = D.isInvalidType(); 9609 9610 // Check for unexpanded parameter packs. 9611 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9612 UPPC_ExceptionType)) { 9613 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9614 D.getIdentifierLoc()); 9615 Invalid = true; 9616 } 9617 9618 IdentifierInfo *II = D.getIdentifier(); 9619 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9620 LookupOrdinaryName, 9621 ForRedeclaration)) { 9622 // The scope should be freshly made just for us. There is just no way 9623 // it contains any previous declaration. 9624 assert(!S->isDeclScope(PrevDecl)); 9625 if (PrevDecl->isTemplateParameter()) { 9626 // Maybe we will complain about the shadowed template parameter. 9627 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9628 PrevDecl = 0; 9629 } 9630 } 9631 9632 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9633 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9634 << D.getCXXScopeSpec().getRange(); 9635 Invalid = true; 9636 } 9637 9638 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9639 D.getSourceRange().getBegin(), 9640 D.getIdentifierLoc(), 9641 D.getIdentifier()); 9642 if (Invalid) 9643 ExDecl->setInvalidDecl(); 9644 9645 // Add the exception declaration into this scope. 9646 if (II) 9647 PushOnScopeChains(ExDecl, S); 9648 else 9649 CurContext->addDecl(ExDecl); 9650 9651 ProcessDeclAttributes(S, ExDecl, D); 9652 return ExDecl; 9653} 9654 9655Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9656 Expr *AssertExpr, 9657 Expr *AssertMessageExpr_, 9658 SourceLocation RParenLoc) { 9659 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9660 9661 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9662 // In a static_assert-declaration, the constant-expression shall be a 9663 // constant expression that can be contextually converted to bool. 9664 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9665 if (Converted.isInvalid()) 9666 return 0; 9667 9668 llvm::APSInt Cond; 9669 if (VerifyIntegerConstantExpression(Converted.get(), &Cond, 9670 PDiag(diag::err_static_assert_expression_is_not_constant), 9671 /*AllowFold=*/false).isInvalid()) 9672 return 0; 9673 9674 if (!Cond) 9675 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9676 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9677 } 9678 9679 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9680 return 0; 9681 9682 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9683 AssertExpr, AssertMessage, RParenLoc); 9684 9685 CurContext->addDecl(Decl); 9686 return Decl; 9687} 9688 9689/// \brief Perform semantic analysis of the given friend type declaration. 9690/// 9691/// \returns A friend declaration that. 9692FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9693 SourceLocation FriendLoc, 9694 TypeSourceInfo *TSInfo) { 9695 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9696 9697 QualType T = TSInfo->getType(); 9698 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9699 9700 // C++03 [class.friend]p2: 9701 // An elaborated-type-specifier shall be used in a friend declaration 9702 // for a class.* 9703 // 9704 // * The class-key of the elaborated-type-specifier is required. 9705 if (!ActiveTemplateInstantiations.empty()) { 9706 // Do not complain about the form of friend template types during 9707 // template instantiation; we will already have complained when the 9708 // template was declared. 9709 } else if (!T->isElaboratedTypeSpecifier()) { 9710 // If we evaluated the type to a record type, suggest putting 9711 // a tag in front. 9712 if (const RecordType *RT = T->getAs<RecordType>()) { 9713 RecordDecl *RD = RT->getDecl(); 9714 9715 std::string InsertionText = std::string(" ") + RD->getKindName(); 9716 9717 Diag(TypeRange.getBegin(), 9718 getLangOptions().CPlusPlus0x ? 9719 diag::warn_cxx98_compat_unelaborated_friend_type : 9720 diag::ext_unelaborated_friend_type) 9721 << (unsigned) RD->getTagKind() 9722 << T 9723 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9724 InsertionText); 9725 } else { 9726 Diag(FriendLoc, 9727 getLangOptions().CPlusPlus0x ? 9728 diag::warn_cxx98_compat_nonclass_type_friend : 9729 diag::ext_nonclass_type_friend) 9730 << T 9731 << SourceRange(FriendLoc, TypeRange.getEnd()); 9732 } 9733 } else if (T->getAs<EnumType>()) { 9734 Diag(FriendLoc, 9735 getLangOptions().CPlusPlus0x ? 9736 diag::warn_cxx98_compat_enum_friend : 9737 diag::ext_enum_friend) 9738 << T 9739 << SourceRange(FriendLoc, TypeRange.getEnd()); 9740 } 9741 9742 // C++0x [class.friend]p3: 9743 // If the type specifier in a friend declaration designates a (possibly 9744 // cv-qualified) class type, that class is declared as a friend; otherwise, 9745 // the friend declaration is ignored. 9746 9747 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9748 // in [class.friend]p3 that we do not implement. 9749 9750 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9751} 9752 9753/// Handle a friend tag declaration where the scope specifier was 9754/// templated. 9755Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9756 unsigned TagSpec, SourceLocation TagLoc, 9757 CXXScopeSpec &SS, 9758 IdentifierInfo *Name, SourceLocation NameLoc, 9759 AttributeList *Attr, 9760 MultiTemplateParamsArg TempParamLists) { 9761 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9762 9763 bool isExplicitSpecialization = false; 9764 bool Invalid = false; 9765 9766 if (TemplateParameterList *TemplateParams 9767 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9768 TempParamLists.get(), 9769 TempParamLists.size(), 9770 /*friend*/ true, 9771 isExplicitSpecialization, 9772 Invalid)) { 9773 if (TemplateParams->size() > 0) { 9774 // This is a declaration of a class template. 9775 if (Invalid) 9776 return 0; 9777 9778 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9779 SS, Name, NameLoc, Attr, 9780 TemplateParams, AS_public, 9781 /*ModulePrivateLoc=*/SourceLocation(), 9782 TempParamLists.size() - 1, 9783 (TemplateParameterList**) TempParamLists.release()).take(); 9784 } else { 9785 // The "template<>" header is extraneous. 9786 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9787 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9788 isExplicitSpecialization = true; 9789 } 9790 } 9791 9792 if (Invalid) return 0; 9793 9794 bool isAllExplicitSpecializations = true; 9795 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9796 if (TempParamLists.get()[I]->size()) { 9797 isAllExplicitSpecializations = false; 9798 break; 9799 } 9800 } 9801 9802 // FIXME: don't ignore attributes. 9803 9804 // If it's explicit specializations all the way down, just forget 9805 // about the template header and build an appropriate non-templated 9806 // friend. TODO: for source fidelity, remember the headers. 9807 if (isAllExplicitSpecializations) { 9808 if (SS.isEmpty()) { 9809 bool Owned = false; 9810 bool IsDependent = false; 9811 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9812 Attr, AS_public, 9813 /*ModulePrivateLoc=*/SourceLocation(), 9814 MultiTemplateParamsArg(), Owned, IsDependent, 9815 /*ScopedEnumKWLoc=*/SourceLocation(), 9816 /*ScopedEnumUsesClassTag=*/false, 9817 /*UnderlyingType=*/TypeResult()); 9818 } 9819 9820 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9821 ElaboratedTypeKeyword Keyword 9822 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9823 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9824 *Name, NameLoc); 9825 if (T.isNull()) 9826 return 0; 9827 9828 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9829 if (isa<DependentNameType>(T)) { 9830 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9831 TL.setElaboratedKeywordLoc(TagLoc); 9832 TL.setQualifierLoc(QualifierLoc); 9833 TL.setNameLoc(NameLoc); 9834 } else { 9835 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9836 TL.setElaboratedKeywordLoc(TagLoc); 9837 TL.setQualifierLoc(QualifierLoc); 9838 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9839 } 9840 9841 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9842 TSI, FriendLoc); 9843 Friend->setAccess(AS_public); 9844 CurContext->addDecl(Friend); 9845 return Friend; 9846 } 9847 9848 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9849 9850 9851 9852 // Handle the case of a templated-scope friend class. e.g. 9853 // template <class T> class A<T>::B; 9854 // FIXME: we don't support these right now. 9855 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9856 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9857 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9858 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9859 TL.setElaboratedKeywordLoc(TagLoc); 9860 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9861 TL.setNameLoc(NameLoc); 9862 9863 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9864 TSI, FriendLoc); 9865 Friend->setAccess(AS_public); 9866 Friend->setUnsupportedFriend(true); 9867 CurContext->addDecl(Friend); 9868 return Friend; 9869} 9870 9871 9872/// Handle a friend type declaration. This works in tandem with 9873/// ActOnTag. 9874/// 9875/// Notes on friend class templates: 9876/// 9877/// We generally treat friend class declarations as if they were 9878/// declaring a class. So, for example, the elaborated type specifier 9879/// in a friend declaration is required to obey the restrictions of a 9880/// class-head (i.e. no typedefs in the scope chain), template 9881/// parameters are required to match up with simple template-ids, &c. 9882/// However, unlike when declaring a template specialization, it's 9883/// okay to refer to a template specialization without an empty 9884/// template parameter declaration, e.g. 9885/// friend class A<T>::B<unsigned>; 9886/// We permit this as a special case; if there are any template 9887/// parameters present at all, require proper matching, i.e. 9888/// template <> template <class T> friend class A<int>::B; 9889Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9890 MultiTemplateParamsArg TempParams) { 9891 SourceLocation Loc = DS.getSourceRange().getBegin(); 9892 9893 assert(DS.isFriendSpecified()); 9894 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9895 9896 // Try to convert the decl specifier to a type. This works for 9897 // friend templates because ActOnTag never produces a ClassTemplateDecl 9898 // for a TUK_Friend. 9899 Declarator TheDeclarator(DS, Declarator::MemberContext); 9900 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9901 QualType T = TSI->getType(); 9902 if (TheDeclarator.isInvalidType()) 9903 return 0; 9904 9905 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9906 return 0; 9907 9908 // This is definitely an error in C++98. It's probably meant to 9909 // be forbidden in C++0x, too, but the specification is just 9910 // poorly written. 9911 // 9912 // The problem is with declarations like the following: 9913 // template <T> friend A<T>::foo; 9914 // where deciding whether a class C is a friend or not now hinges 9915 // on whether there exists an instantiation of A that causes 9916 // 'foo' to equal C. There are restrictions on class-heads 9917 // (which we declare (by fiat) elaborated friend declarations to 9918 // be) that makes this tractable. 9919 // 9920 // FIXME: handle "template <> friend class A<T>;", which 9921 // is possibly well-formed? Who even knows? 9922 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9923 Diag(Loc, diag::err_tagless_friend_type_template) 9924 << DS.getSourceRange(); 9925 return 0; 9926 } 9927 9928 // C++98 [class.friend]p1: A friend of a class is a function 9929 // or class that is not a member of the class . . . 9930 // This is fixed in DR77, which just barely didn't make the C++03 9931 // deadline. It's also a very silly restriction that seriously 9932 // affects inner classes and which nobody else seems to implement; 9933 // thus we never diagnose it, not even in -pedantic. 9934 // 9935 // But note that we could warn about it: it's always useless to 9936 // friend one of your own members (it's not, however, worthless to 9937 // friend a member of an arbitrary specialization of your template). 9938 9939 Decl *D; 9940 if (unsigned NumTempParamLists = TempParams.size()) 9941 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9942 NumTempParamLists, 9943 TempParams.release(), 9944 TSI, 9945 DS.getFriendSpecLoc()); 9946 else 9947 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 9948 9949 if (!D) 9950 return 0; 9951 9952 D->setAccess(AS_public); 9953 CurContext->addDecl(D); 9954 9955 return D; 9956} 9957 9958Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 9959 MultiTemplateParamsArg TemplateParams) { 9960 const DeclSpec &DS = D.getDeclSpec(); 9961 9962 assert(DS.isFriendSpecified()); 9963 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9964 9965 SourceLocation Loc = D.getIdentifierLoc(); 9966 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9967 9968 // C++ [class.friend]p1 9969 // A friend of a class is a function or class.... 9970 // Note that this sees through typedefs, which is intended. 9971 // It *doesn't* see through dependent types, which is correct 9972 // according to [temp.arg.type]p3: 9973 // If a declaration acquires a function type through a 9974 // type dependent on a template-parameter and this causes 9975 // a declaration that does not use the syntactic form of a 9976 // function declarator to have a function type, the program 9977 // is ill-formed. 9978 if (!TInfo->getType()->isFunctionType()) { 9979 Diag(Loc, diag::err_unexpected_friend); 9980 9981 // It might be worthwhile to try to recover by creating an 9982 // appropriate declaration. 9983 return 0; 9984 } 9985 9986 // C++ [namespace.memdef]p3 9987 // - If a friend declaration in a non-local class first declares a 9988 // class or function, the friend class or function is a member 9989 // of the innermost enclosing namespace. 9990 // - The name of the friend is not found by simple name lookup 9991 // until a matching declaration is provided in that namespace 9992 // scope (either before or after the class declaration granting 9993 // friendship). 9994 // - If a friend function is called, its name may be found by the 9995 // name lookup that considers functions from namespaces and 9996 // classes associated with the types of the function arguments. 9997 // - When looking for a prior declaration of a class or a function 9998 // declared as a friend, scopes outside the innermost enclosing 9999 // namespace scope are not considered. 10000 10001 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10002 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10003 DeclarationName Name = NameInfo.getName(); 10004 assert(Name); 10005 10006 // Check for unexpanded parameter packs. 10007 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10008 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10009 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10010 return 0; 10011 10012 // The context we found the declaration in, or in which we should 10013 // create the declaration. 10014 DeclContext *DC; 10015 Scope *DCScope = S; 10016 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10017 ForRedeclaration); 10018 10019 // FIXME: there are different rules in local classes 10020 10021 // There are four cases here. 10022 // - There's no scope specifier, in which case we just go to the 10023 // appropriate scope and look for a function or function template 10024 // there as appropriate. 10025 // Recover from invalid scope qualifiers as if they just weren't there. 10026 if (SS.isInvalid() || !SS.isSet()) { 10027 // C++0x [namespace.memdef]p3: 10028 // If the name in a friend declaration is neither qualified nor 10029 // a template-id and the declaration is a function or an 10030 // elaborated-type-specifier, the lookup to determine whether 10031 // the entity has been previously declared shall not consider 10032 // any scopes outside the innermost enclosing namespace. 10033 // C++0x [class.friend]p11: 10034 // If a friend declaration appears in a local class and the name 10035 // specified is an unqualified name, a prior declaration is 10036 // looked up without considering scopes that are outside the 10037 // innermost enclosing non-class scope. For a friend function 10038 // declaration, if there is no prior declaration, the program is 10039 // ill-formed. 10040 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10041 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10042 10043 // Find the appropriate context according to the above. 10044 DC = CurContext; 10045 while (true) { 10046 // Skip class contexts. If someone can cite chapter and verse 10047 // for this behavior, that would be nice --- it's what GCC and 10048 // EDG do, and it seems like a reasonable intent, but the spec 10049 // really only says that checks for unqualified existing 10050 // declarations should stop at the nearest enclosing namespace, 10051 // not that they should only consider the nearest enclosing 10052 // namespace. 10053 while (DC->isRecord()) 10054 DC = DC->getParent(); 10055 10056 LookupQualifiedName(Previous, DC); 10057 10058 // TODO: decide what we think about using declarations. 10059 if (isLocal || !Previous.empty()) 10060 break; 10061 10062 if (isTemplateId) { 10063 if (isa<TranslationUnitDecl>(DC)) break; 10064 } else { 10065 if (DC->isFileContext()) break; 10066 } 10067 DC = DC->getParent(); 10068 } 10069 10070 // C++ [class.friend]p1: A friend of a class is a function or 10071 // class that is not a member of the class . . . 10072 // C++11 changes this for both friend types and functions. 10073 // Most C++ 98 compilers do seem to give an error here, so 10074 // we do, too. 10075 if (!Previous.empty() && DC->Equals(CurContext)) 10076 Diag(DS.getFriendSpecLoc(), 10077 getLangOptions().CPlusPlus0x ? 10078 diag::warn_cxx98_compat_friend_is_member : 10079 diag::err_friend_is_member); 10080 10081 DCScope = getScopeForDeclContext(S, DC); 10082 10083 // C++ [class.friend]p6: 10084 // A function can be defined in a friend declaration of a class if and 10085 // only if the class is a non-local class (9.8), the function name is 10086 // unqualified, and the function has namespace scope. 10087 if (isLocal && D.isFunctionDefinition()) { 10088 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10089 } 10090 10091 // - There's a non-dependent scope specifier, in which case we 10092 // compute it and do a previous lookup there for a function 10093 // or function template. 10094 } else if (!SS.getScopeRep()->isDependent()) { 10095 DC = computeDeclContext(SS); 10096 if (!DC) return 0; 10097 10098 if (RequireCompleteDeclContext(SS, DC)) return 0; 10099 10100 LookupQualifiedName(Previous, DC); 10101 10102 // Ignore things found implicitly in the wrong scope. 10103 // TODO: better diagnostics for this case. Suggesting the right 10104 // qualified scope would be nice... 10105 LookupResult::Filter F = Previous.makeFilter(); 10106 while (F.hasNext()) { 10107 NamedDecl *D = F.next(); 10108 if (!DC->InEnclosingNamespaceSetOf( 10109 D->getDeclContext()->getRedeclContext())) 10110 F.erase(); 10111 } 10112 F.done(); 10113 10114 if (Previous.empty()) { 10115 D.setInvalidType(); 10116 Diag(Loc, diag::err_qualified_friend_not_found) 10117 << Name << TInfo->getType(); 10118 return 0; 10119 } 10120 10121 // C++ [class.friend]p1: A friend of a class is a function or 10122 // class that is not a member of the class . . . 10123 if (DC->Equals(CurContext)) 10124 Diag(DS.getFriendSpecLoc(), 10125 getLangOptions().CPlusPlus0x ? 10126 diag::warn_cxx98_compat_friend_is_member : 10127 diag::err_friend_is_member); 10128 10129 if (D.isFunctionDefinition()) { 10130 // C++ [class.friend]p6: 10131 // A function can be defined in a friend declaration of a class if and 10132 // only if the class is a non-local class (9.8), the function name is 10133 // unqualified, and the function has namespace scope. 10134 SemaDiagnosticBuilder DB 10135 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10136 10137 DB << SS.getScopeRep(); 10138 if (DC->isFileContext()) 10139 DB << FixItHint::CreateRemoval(SS.getRange()); 10140 SS.clear(); 10141 } 10142 10143 // - There's a scope specifier that does not match any template 10144 // parameter lists, in which case we use some arbitrary context, 10145 // create a method or method template, and wait for instantiation. 10146 // - There's a scope specifier that does match some template 10147 // parameter lists, which we don't handle right now. 10148 } else { 10149 if (D.isFunctionDefinition()) { 10150 // C++ [class.friend]p6: 10151 // A function can be defined in a friend declaration of a class if and 10152 // only if the class is a non-local class (9.8), the function name is 10153 // unqualified, and the function has namespace scope. 10154 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10155 << SS.getScopeRep(); 10156 } 10157 10158 DC = CurContext; 10159 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10160 } 10161 10162 if (!DC->isRecord()) { 10163 // This implies that it has to be an operator or function. 10164 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10165 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10166 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10167 Diag(Loc, diag::err_introducing_special_friend) << 10168 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10169 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10170 return 0; 10171 } 10172 } 10173 10174 // FIXME: This is an egregious hack to cope with cases where the scope stack 10175 // does not contain the declaration context, i.e., in an out-of-line 10176 // definition of a class. 10177 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10178 if (!DCScope) { 10179 FakeDCScope.setEntity(DC); 10180 DCScope = &FakeDCScope; 10181 } 10182 10183 bool AddToScope = true; 10184 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10185 move(TemplateParams), AddToScope); 10186 if (!ND) return 0; 10187 10188 assert(ND->getDeclContext() == DC); 10189 assert(ND->getLexicalDeclContext() == CurContext); 10190 10191 // Add the function declaration to the appropriate lookup tables, 10192 // adjusting the redeclarations list as necessary. We don't 10193 // want to do this yet if the friending class is dependent. 10194 // 10195 // Also update the scope-based lookup if the target context's 10196 // lookup context is in lexical scope. 10197 if (!CurContext->isDependentContext()) { 10198 DC = DC->getRedeclContext(); 10199 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10200 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10201 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10202 } 10203 10204 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10205 D.getIdentifierLoc(), ND, 10206 DS.getFriendSpecLoc()); 10207 FrD->setAccess(AS_public); 10208 CurContext->addDecl(FrD); 10209 10210 if (ND->isInvalidDecl()) 10211 FrD->setInvalidDecl(); 10212 else { 10213 FunctionDecl *FD; 10214 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10215 FD = FTD->getTemplatedDecl(); 10216 else 10217 FD = cast<FunctionDecl>(ND); 10218 10219 // Mark templated-scope function declarations as unsupported. 10220 if (FD->getNumTemplateParameterLists()) 10221 FrD->setUnsupportedFriend(true); 10222 } 10223 10224 return ND; 10225} 10226 10227void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10228 AdjustDeclIfTemplate(Dcl); 10229 10230 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10231 if (!Fn) { 10232 Diag(DelLoc, diag::err_deleted_non_function); 10233 return; 10234 } 10235 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10236 Diag(DelLoc, diag::err_deleted_decl_not_first); 10237 Diag(Prev->getLocation(), diag::note_previous_declaration); 10238 // If the declaration wasn't the first, we delete the function anyway for 10239 // recovery. 10240 } 10241 Fn->setDeletedAsWritten(); 10242} 10243 10244void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10245 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10246 10247 if (MD) { 10248 if (MD->getParent()->isDependentType()) { 10249 MD->setDefaulted(); 10250 MD->setExplicitlyDefaulted(); 10251 return; 10252 } 10253 10254 CXXSpecialMember Member = getSpecialMember(MD); 10255 if (Member == CXXInvalid) { 10256 Diag(DefaultLoc, diag::err_default_special_members); 10257 return; 10258 } 10259 10260 MD->setDefaulted(); 10261 MD->setExplicitlyDefaulted(); 10262 10263 // If this definition appears within the record, do the checking when 10264 // the record is complete. 10265 const FunctionDecl *Primary = MD; 10266 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10267 // Find the uninstantiated declaration that actually had the '= default' 10268 // on it. 10269 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10270 10271 if (Primary == Primary->getCanonicalDecl()) 10272 return; 10273 10274 switch (Member) { 10275 case CXXDefaultConstructor: { 10276 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10277 CheckExplicitlyDefaultedDefaultConstructor(CD); 10278 if (!CD->isInvalidDecl()) 10279 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10280 break; 10281 } 10282 10283 case CXXCopyConstructor: { 10284 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10285 CheckExplicitlyDefaultedCopyConstructor(CD); 10286 if (!CD->isInvalidDecl()) 10287 DefineImplicitCopyConstructor(DefaultLoc, CD); 10288 break; 10289 } 10290 10291 case CXXCopyAssignment: { 10292 CheckExplicitlyDefaultedCopyAssignment(MD); 10293 if (!MD->isInvalidDecl()) 10294 DefineImplicitCopyAssignment(DefaultLoc, MD); 10295 break; 10296 } 10297 10298 case CXXDestructor: { 10299 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10300 CheckExplicitlyDefaultedDestructor(DD); 10301 if (!DD->isInvalidDecl()) 10302 DefineImplicitDestructor(DefaultLoc, DD); 10303 break; 10304 } 10305 10306 case CXXMoveConstructor: { 10307 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10308 CheckExplicitlyDefaultedMoveConstructor(CD); 10309 if (!CD->isInvalidDecl()) 10310 DefineImplicitMoveConstructor(DefaultLoc, CD); 10311 break; 10312 } 10313 10314 case CXXMoveAssignment: { 10315 CheckExplicitlyDefaultedMoveAssignment(MD); 10316 if (!MD->isInvalidDecl()) 10317 DefineImplicitMoveAssignment(DefaultLoc, MD); 10318 break; 10319 } 10320 10321 case CXXInvalid: 10322 llvm_unreachable("Invalid special member."); 10323 } 10324 } else { 10325 Diag(DefaultLoc, diag::err_default_special_members); 10326 } 10327} 10328 10329static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10330 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10331 Stmt *SubStmt = *CI; 10332 if (!SubStmt) 10333 continue; 10334 if (isa<ReturnStmt>(SubStmt)) 10335 Self.Diag(SubStmt->getSourceRange().getBegin(), 10336 diag::err_return_in_constructor_handler); 10337 if (!isa<Expr>(SubStmt)) 10338 SearchForReturnInStmt(Self, SubStmt); 10339 } 10340} 10341 10342void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10343 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10344 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10345 SearchForReturnInStmt(*this, Handler); 10346 } 10347} 10348 10349bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10350 const CXXMethodDecl *Old) { 10351 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10352 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10353 10354 if (Context.hasSameType(NewTy, OldTy) || 10355 NewTy->isDependentType() || OldTy->isDependentType()) 10356 return false; 10357 10358 // Check if the return types are covariant 10359 QualType NewClassTy, OldClassTy; 10360 10361 /// Both types must be pointers or references to classes. 10362 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10363 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10364 NewClassTy = NewPT->getPointeeType(); 10365 OldClassTy = OldPT->getPointeeType(); 10366 } 10367 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10368 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10369 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10370 NewClassTy = NewRT->getPointeeType(); 10371 OldClassTy = OldRT->getPointeeType(); 10372 } 10373 } 10374 } 10375 10376 // The return types aren't either both pointers or references to a class type. 10377 if (NewClassTy.isNull()) { 10378 Diag(New->getLocation(), 10379 diag::err_different_return_type_for_overriding_virtual_function) 10380 << New->getDeclName() << NewTy << OldTy; 10381 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10382 10383 return true; 10384 } 10385 10386 // C++ [class.virtual]p6: 10387 // If the return type of D::f differs from the return type of B::f, the 10388 // class type in the return type of D::f shall be complete at the point of 10389 // declaration of D::f or shall be the class type D. 10390 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10391 if (!RT->isBeingDefined() && 10392 RequireCompleteType(New->getLocation(), NewClassTy, 10393 PDiag(diag::err_covariant_return_incomplete) 10394 << New->getDeclName())) 10395 return true; 10396 } 10397 10398 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10399 // Check if the new class derives from the old class. 10400 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10401 Diag(New->getLocation(), 10402 diag::err_covariant_return_not_derived) 10403 << New->getDeclName() << NewTy << OldTy; 10404 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10405 return true; 10406 } 10407 10408 // Check if we the conversion from derived to base is valid. 10409 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10410 diag::err_covariant_return_inaccessible_base, 10411 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10412 // FIXME: Should this point to the return type? 10413 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10414 // FIXME: this note won't trigger for delayed access control 10415 // diagnostics, and it's impossible to get an undelayed error 10416 // here from access control during the original parse because 10417 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10418 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10419 return true; 10420 } 10421 } 10422 10423 // The qualifiers of the return types must be the same. 10424 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10425 Diag(New->getLocation(), 10426 diag::err_covariant_return_type_different_qualifications) 10427 << New->getDeclName() << NewTy << OldTy; 10428 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10429 return true; 10430 }; 10431 10432 10433 // The new class type must have the same or less qualifiers as the old type. 10434 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10435 Diag(New->getLocation(), 10436 diag::err_covariant_return_type_class_type_more_qualified) 10437 << New->getDeclName() << NewTy << OldTy; 10438 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10439 return true; 10440 }; 10441 10442 return false; 10443} 10444 10445/// \brief Mark the given method pure. 10446/// 10447/// \param Method the method to be marked pure. 10448/// 10449/// \param InitRange the source range that covers the "0" initializer. 10450bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10451 SourceLocation EndLoc = InitRange.getEnd(); 10452 if (EndLoc.isValid()) 10453 Method->setRangeEnd(EndLoc); 10454 10455 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10456 Method->setPure(); 10457 return false; 10458 } 10459 10460 if (!Method->isInvalidDecl()) 10461 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10462 << Method->getDeclName() << InitRange; 10463 return true; 10464} 10465 10466/// \brief Determine whether the given declaration is a static data member. 10467static bool isStaticDataMember(Decl *D) { 10468 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10469 if (!Var) 10470 return false; 10471 10472 return Var->isStaticDataMember(); 10473} 10474/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10475/// an initializer for the out-of-line declaration 'Dcl'. The scope 10476/// is a fresh scope pushed for just this purpose. 10477/// 10478/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10479/// static data member of class X, names should be looked up in the scope of 10480/// class X. 10481void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10482 // If there is no declaration, there was an error parsing it. 10483 if (D == 0 || D->isInvalidDecl()) return; 10484 10485 // We should only get called for declarations with scope specifiers, like: 10486 // int foo::bar; 10487 assert(D->isOutOfLine()); 10488 EnterDeclaratorContext(S, D->getDeclContext()); 10489 10490 // If we are parsing the initializer for a static data member, push a 10491 // new expression evaluation context that is associated with this static 10492 // data member. 10493 if (isStaticDataMember(D)) 10494 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10495} 10496 10497/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10498/// initializer for the out-of-line declaration 'D'. 10499void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10500 // If there is no declaration, there was an error parsing it. 10501 if (D == 0 || D->isInvalidDecl()) return; 10502 10503 if (isStaticDataMember(D)) 10504 PopExpressionEvaluationContext(); 10505 10506 assert(D->isOutOfLine()); 10507 ExitDeclaratorContext(S); 10508} 10509 10510/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10511/// C++ if/switch/while/for statement. 10512/// e.g: "if (int x = f()) {...}" 10513DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10514 // C++ 6.4p2: 10515 // The declarator shall not specify a function or an array. 10516 // The type-specifier-seq shall not contain typedef and shall not declare a 10517 // new class or enumeration. 10518 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10519 "Parser allowed 'typedef' as storage class of condition decl."); 10520 10521 Decl *Dcl = ActOnDeclarator(S, D); 10522 if (!Dcl) 10523 return true; 10524 10525 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10526 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10527 << D.getSourceRange(); 10528 return true; 10529 } 10530 10531 return Dcl; 10532} 10533 10534void Sema::LoadExternalVTableUses() { 10535 if (!ExternalSource) 10536 return; 10537 10538 SmallVector<ExternalVTableUse, 4> VTables; 10539 ExternalSource->ReadUsedVTables(VTables); 10540 SmallVector<VTableUse, 4> NewUses; 10541 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10542 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10543 = VTablesUsed.find(VTables[I].Record); 10544 // Even if a definition wasn't required before, it may be required now. 10545 if (Pos != VTablesUsed.end()) { 10546 if (!Pos->second && VTables[I].DefinitionRequired) 10547 Pos->second = true; 10548 continue; 10549 } 10550 10551 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10552 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10553 } 10554 10555 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10556} 10557 10558void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10559 bool DefinitionRequired) { 10560 // Ignore any vtable uses in unevaluated operands or for classes that do 10561 // not have a vtable. 10562 if (!Class->isDynamicClass() || Class->isDependentContext() || 10563 CurContext->isDependentContext() || 10564 ExprEvalContexts.back().Context == Unevaluated) 10565 return; 10566 10567 // Try to insert this class into the map. 10568 LoadExternalVTableUses(); 10569 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10570 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10571 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10572 if (!Pos.second) { 10573 // If we already had an entry, check to see if we are promoting this vtable 10574 // to required a definition. If so, we need to reappend to the VTableUses 10575 // list, since we may have already processed the first entry. 10576 if (DefinitionRequired && !Pos.first->second) { 10577 Pos.first->second = true; 10578 } else { 10579 // Otherwise, we can early exit. 10580 return; 10581 } 10582 } 10583 10584 // Local classes need to have their virtual members marked 10585 // immediately. For all other classes, we mark their virtual members 10586 // at the end of the translation unit. 10587 if (Class->isLocalClass()) 10588 MarkVirtualMembersReferenced(Loc, Class); 10589 else 10590 VTableUses.push_back(std::make_pair(Class, Loc)); 10591} 10592 10593bool Sema::DefineUsedVTables() { 10594 LoadExternalVTableUses(); 10595 if (VTableUses.empty()) 10596 return false; 10597 10598 // Note: The VTableUses vector could grow as a result of marking 10599 // the members of a class as "used", so we check the size each 10600 // time through the loop and prefer indices (with are stable) to 10601 // iterators (which are not). 10602 bool DefinedAnything = false; 10603 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10604 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10605 if (!Class) 10606 continue; 10607 10608 SourceLocation Loc = VTableUses[I].second; 10609 10610 // If this class has a key function, but that key function is 10611 // defined in another translation unit, we don't need to emit the 10612 // vtable even though we're using it. 10613 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10614 if (KeyFunction && !KeyFunction->hasBody()) { 10615 switch (KeyFunction->getTemplateSpecializationKind()) { 10616 case TSK_Undeclared: 10617 case TSK_ExplicitSpecialization: 10618 case TSK_ExplicitInstantiationDeclaration: 10619 // The key function is in another translation unit. 10620 continue; 10621 10622 case TSK_ExplicitInstantiationDefinition: 10623 case TSK_ImplicitInstantiation: 10624 // We will be instantiating the key function. 10625 break; 10626 } 10627 } else if (!KeyFunction) { 10628 // If we have a class with no key function that is the subject 10629 // of an explicit instantiation declaration, suppress the 10630 // vtable; it will live with the explicit instantiation 10631 // definition. 10632 bool IsExplicitInstantiationDeclaration 10633 = Class->getTemplateSpecializationKind() 10634 == TSK_ExplicitInstantiationDeclaration; 10635 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10636 REnd = Class->redecls_end(); 10637 R != REnd; ++R) { 10638 TemplateSpecializationKind TSK 10639 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10640 if (TSK == TSK_ExplicitInstantiationDeclaration) 10641 IsExplicitInstantiationDeclaration = true; 10642 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10643 IsExplicitInstantiationDeclaration = false; 10644 break; 10645 } 10646 } 10647 10648 if (IsExplicitInstantiationDeclaration) 10649 continue; 10650 } 10651 10652 // Mark all of the virtual members of this class as referenced, so 10653 // that we can build a vtable. Then, tell the AST consumer that a 10654 // vtable for this class is required. 10655 DefinedAnything = true; 10656 MarkVirtualMembersReferenced(Loc, Class); 10657 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10658 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10659 10660 // Optionally warn if we're emitting a weak vtable. 10661 if (Class->getLinkage() == ExternalLinkage && 10662 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10663 const FunctionDecl *KeyFunctionDef = 0; 10664 if (!KeyFunction || 10665 (KeyFunction->hasBody(KeyFunctionDef) && 10666 KeyFunctionDef->isInlined())) 10667 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10668 TSK_ExplicitInstantiationDefinition 10669 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10670 << Class; 10671 } 10672 } 10673 VTableUses.clear(); 10674 10675 return DefinedAnything; 10676} 10677 10678void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10679 const CXXRecordDecl *RD) { 10680 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10681 e = RD->method_end(); i != e; ++i) { 10682 CXXMethodDecl *MD = *i; 10683 10684 // C++ [basic.def.odr]p2: 10685 // [...] A virtual member function is used if it is not pure. [...] 10686 if (MD->isVirtual() && !MD->isPure()) 10687 MarkFunctionReferenced(Loc, MD); 10688 } 10689 10690 // Only classes that have virtual bases need a VTT. 10691 if (RD->getNumVBases() == 0) 10692 return; 10693 10694 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10695 e = RD->bases_end(); i != e; ++i) { 10696 const CXXRecordDecl *Base = 10697 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10698 if (Base->getNumVBases() == 0) 10699 continue; 10700 MarkVirtualMembersReferenced(Loc, Base); 10701 } 10702} 10703 10704/// SetIvarInitializers - This routine builds initialization ASTs for the 10705/// Objective-C implementation whose ivars need be initialized. 10706void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10707 if (!getLangOptions().CPlusPlus) 10708 return; 10709 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10710 SmallVector<ObjCIvarDecl*, 8> ivars; 10711 CollectIvarsToConstructOrDestruct(OID, ivars); 10712 if (ivars.empty()) 10713 return; 10714 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10715 for (unsigned i = 0; i < ivars.size(); i++) { 10716 FieldDecl *Field = ivars[i]; 10717 if (Field->isInvalidDecl()) 10718 continue; 10719 10720 CXXCtorInitializer *Member; 10721 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10722 InitializationKind InitKind = 10723 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10724 10725 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10726 ExprResult MemberInit = 10727 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10728 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10729 // Note, MemberInit could actually come back empty if no initialization 10730 // is required (e.g., because it would call a trivial default constructor) 10731 if (!MemberInit.get() || MemberInit.isInvalid()) 10732 continue; 10733 10734 Member = 10735 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10736 SourceLocation(), 10737 MemberInit.takeAs<Expr>(), 10738 SourceLocation()); 10739 AllToInit.push_back(Member); 10740 10741 // Be sure that the destructor is accessible and is marked as referenced. 10742 if (const RecordType *RecordTy 10743 = Context.getBaseElementType(Field->getType()) 10744 ->getAs<RecordType>()) { 10745 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10746 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10747 MarkFunctionReferenced(Field->getLocation(), Destructor); 10748 CheckDestructorAccess(Field->getLocation(), Destructor, 10749 PDiag(diag::err_access_dtor_ivar) 10750 << Context.getBaseElementType(Field->getType())); 10751 } 10752 } 10753 } 10754 ObjCImplementation->setIvarInitializers(Context, 10755 AllToInit.data(), AllToInit.size()); 10756 } 10757} 10758 10759static 10760void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10761 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10762 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10763 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10764 Sema &S) { 10765 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10766 CE = Current.end(); 10767 if (Ctor->isInvalidDecl()) 10768 return; 10769 10770 const FunctionDecl *FNTarget = 0; 10771 CXXConstructorDecl *Target; 10772 10773 // We ignore the result here since if we don't have a body, Target will be 10774 // null below. 10775 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10776 Target 10777= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10778 10779 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10780 // Avoid dereferencing a null pointer here. 10781 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10782 10783 if (!Current.insert(Canonical)) 10784 return; 10785 10786 // We know that beyond here, we aren't chaining into a cycle. 10787 if (!Target || !Target->isDelegatingConstructor() || 10788 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10789 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10790 Valid.insert(*CI); 10791 Current.clear(); 10792 // We've hit a cycle. 10793 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10794 Current.count(TCanonical)) { 10795 // If we haven't diagnosed this cycle yet, do so now. 10796 if (!Invalid.count(TCanonical)) { 10797 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10798 diag::warn_delegating_ctor_cycle) 10799 << Ctor; 10800 10801 // Don't add a note for a function delegating directo to itself. 10802 if (TCanonical != Canonical) 10803 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10804 10805 CXXConstructorDecl *C = Target; 10806 while (C->getCanonicalDecl() != Canonical) { 10807 (void)C->getTargetConstructor()->hasBody(FNTarget); 10808 assert(FNTarget && "Ctor cycle through bodiless function"); 10809 10810 C 10811 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10812 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10813 } 10814 } 10815 10816 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10817 Invalid.insert(*CI); 10818 Current.clear(); 10819 } else { 10820 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10821 } 10822} 10823 10824 10825void Sema::CheckDelegatingCtorCycles() { 10826 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10827 10828 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10829 CE = Current.end(); 10830 10831 for (DelegatingCtorDeclsType::iterator 10832 I = DelegatingCtorDecls.begin(ExternalSource), 10833 E = DelegatingCtorDecls.end(); 10834 I != E; ++I) { 10835 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10836 } 10837 10838 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10839 (*CI)->setInvalidDecl(); 10840} 10841 10842/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10843Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10844 // Implicitly declared functions (e.g. copy constructors) are 10845 // __host__ __device__ 10846 if (D->isImplicit()) 10847 return CFT_HostDevice; 10848 10849 if (D->hasAttr<CUDAGlobalAttr>()) 10850 return CFT_Global; 10851 10852 if (D->hasAttr<CUDADeviceAttr>()) { 10853 if (D->hasAttr<CUDAHostAttr>()) 10854 return CFT_HostDevice; 10855 else 10856 return CFT_Device; 10857 } 10858 10859 return CFT_Host; 10860} 10861 10862bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10863 CUDAFunctionTarget CalleeTarget) { 10864 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10865 // Callable from the device only." 10866 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10867 return true; 10868 10869 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10870 // Callable from the host only." 10871 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10872 // Callable from the host only." 10873 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10874 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 10875 return true; 10876 10877 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 10878 return true; 10879 10880 return false; 10881} 10882