SemaDeclCXX.cpp revision f502d8ec9b43b259db9e37e9622279df46070fed
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/RecursiveASTVisitor.h" 29#include "clang/AST/StmtVisitor.h" 30#include "clang/AST/TypeLoc.h" 31#include "clang/AST/TypeOrdering.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/ParsedTemplate.h" 34#include "clang/Basic/PartialDiagnostic.h" 35#include "clang/Lex/Preprocessor.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->getLocStart(), 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->getLocStart(), 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->getLocStart(), 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(SourceLocation CallLoc, 129 CXXMethodDecl *Method) { 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 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 137 if (!Proto) 138 return; 139 140 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 141 142 // If this function can throw any exceptions, make a note of that. 143 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 144 ClearExceptions(); 145 ComputedEST = EST; 146 return; 147 } 148 149 // FIXME: If the call to this decl is using any of its default arguments, we 150 // need to search them for potentially-throwing calls. 151 152 // If this function has a basic noexcept, it doesn't affect the outcome. 153 if (EST == EST_BasicNoexcept) 154 return; 155 156 // If we have a throw-all spec at this point, ignore the function. 157 if (ComputedEST == EST_None) 158 return; 159 160 // If we're still at noexcept(true) and there's a nothrow() callee, 161 // change to that specification. 162 if (EST == EST_DynamicNone) { 163 if (ComputedEST == EST_BasicNoexcept) 164 ComputedEST = EST_DynamicNone; 165 return; 166 } 167 168 // Check out noexcept specs. 169 if (EST == EST_ComputedNoexcept) { 170 FunctionProtoType::NoexceptResult NR = 171 Proto->getNoexceptSpec(Self->Context); 172 assert(NR != FunctionProtoType::NR_NoNoexcept && 173 "Must have noexcept result for EST_ComputedNoexcept."); 174 assert(NR != FunctionProtoType::NR_Dependent && 175 "Should not generate implicit declarations for dependent cases, " 176 "and don't know how to handle them anyway."); 177 178 // noexcept(false) -> no spec on the new function 179 if (NR == FunctionProtoType::NR_Throw) { 180 ClearExceptions(); 181 ComputedEST = EST_None; 182 } 183 // noexcept(true) won't change anything either. 184 return; 185 } 186 187 assert(EST == EST_Dynamic && "EST case not considered earlier."); 188 assert(ComputedEST != EST_None && 189 "Shouldn't collect exceptions when throw-all is guaranteed."); 190 ComputedEST = EST_Dynamic; 191 // Record the exceptions in this function's exception specification. 192 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 193 EEnd = Proto->exception_end(); 194 E != EEnd; ++E) 195 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 196 Exceptions.push_back(*E); 197} 198 199void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 200 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 201 return; 202 203 // FIXME: 204 // 205 // C++0x [except.spec]p14: 206 // [An] implicit exception-specification specifies the type-id T if and 207 // only if T is allowed by the exception-specification of a function directly 208 // invoked by f's implicit definition; f shall allow all exceptions if any 209 // function it directly invokes allows all exceptions, and f shall allow no 210 // exceptions if every function it directly invokes allows no exceptions. 211 // 212 // Note in particular that if an implicit exception-specification is generated 213 // for a function containing a throw-expression, that specification can still 214 // be noexcept(true). 215 // 216 // Note also that 'directly invoked' is not defined in the standard, and there 217 // is no indication that we should only consider potentially-evaluated calls. 218 // 219 // Ultimately we should implement the intent of the standard: the exception 220 // specification should be the set of exceptions which can be thrown by the 221 // implicit definition. For now, we assume that any non-nothrow expression can 222 // throw any exception. 223 224 if (Self->canThrow(E)) 225 ComputedEST = EST_None; 226} 227 228bool 229Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 230 SourceLocation EqualLoc) { 231 if (RequireCompleteType(Param->getLocation(), Param->getType(), 232 diag::err_typecheck_decl_incomplete_type)) { 233 Param->setInvalidDecl(); 234 return true; 235 } 236 237 // C++ [dcl.fct.default]p5 238 // A default argument expression is implicitly converted (clause 239 // 4) to the parameter type. The default argument expression has 240 // the same semantic constraints as the initializer expression in 241 // a declaration of a variable of the parameter type, using the 242 // copy-initialization semantics (8.5). 243 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 244 Param); 245 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 246 EqualLoc); 247 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 248 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 249 MultiExprArg(*this, &Arg, 1)); 250 if (Result.isInvalid()) 251 return true; 252 Arg = Result.takeAs<Expr>(); 253 254 CheckImplicitConversions(Arg, EqualLoc); 255 Arg = MaybeCreateExprWithCleanups(Arg); 256 257 // Okay: add the default argument to the parameter 258 Param->setDefaultArg(Arg); 259 260 // We have already instantiated this parameter; provide each of the 261 // instantiations with the uninstantiated default argument. 262 UnparsedDefaultArgInstantiationsMap::iterator InstPos 263 = UnparsedDefaultArgInstantiations.find(Param); 264 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 265 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 266 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 267 268 // We're done tracking this parameter's instantiations. 269 UnparsedDefaultArgInstantiations.erase(InstPos); 270 } 271 272 return false; 273} 274 275/// ActOnParamDefaultArgument - Check whether the default argument 276/// provided for a function parameter is well-formed. If so, attach it 277/// to the parameter declaration. 278void 279Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 280 Expr *DefaultArg) { 281 if (!param || !DefaultArg) 282 return; 283 284 ParmVarDecl *Param = cast<ParmVarDecl>(param); 285 UnparsedDefaultArgLocs.erase(Param); 286 287 // Default arguments are only permitted in C++ 288 if (!getLangOpts().CPlusPlus) { 289 Diag(EqualLoc, diag::err_param_default_argument) 290 << DefaultArg->getSourceRange(); 291 Param->setInvalidDecl(); 292 return; 293 } 294 295 // Check for unexpanded parameter packs. 296 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 297 Param->setInvalidDecl(); 298 return; 299 } 300 301 // Check that the default argument is well-formed 302 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 303 if (DefaultArgChecker.Visit(DefaultArg)) { 304 Param->setInvalidDecl(); 305 return; 306 } 307 308 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 309} 310 311/// ActOnParamUnparsedDefaultArgument - We've seen a default 312/// argument for a function parameter, but we can't parse it yet 313/// because we're inside a class definition. Note that this default 314/// argument will be parsed later. 315void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 316 SourceLocation EqualLoc, 317 SourceLocation ArgLoc) { 318 if (!param) 319 return; 320 321 ParmVarDecl *Param = cast<ParmVarDecl>(param); 322 if (Param) 323 Param->setUnparsedDefaultArg(); 324 325 UnparsedDefaultArgLocs[Param] = ArgLoc; 326} 327 328/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 329/// the default argument for the parameter param failed. 330void Sema::ActOnParamDefaultArgumentError(Decl *param) { 331 if (!param) 332 return; 333 334 ParmVarDecl *Param = cast<ParmVarDecl>(param); 335 336 Param->setInvalidDecl(); 337 338 UnparsedDefaultArgLocs.erase(Param); 339} 340 341/// CheckExtraCXXDefaultArguments - Check for any extra default 342/// arguments in the declarator, which is not a function declaration 343/// or definition and therefore is not permitted to have default 344/// arguments. This routine should be invoked for every declarator 345/// that is not a function declaration or definition. 346void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 347 // C++ [dcl.fct.default]p3 348 // A default argument expression shall be specified only in the 349 // parameter-declaration-clause of a function declaration or in a 350 // template-parameter (14.1). It shall not be specified for a 351 // parameter pack. If it is specified in a 352 // parameter-declaration-clause, it shall not occur within a 353 // declarator or abstract-declarator of a parameter-declaration. 354 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 355 DeclaratorChunk &chunk = D.getTypeObject(i); 356 if (chunk.Kind == DeclaratorChunk::Function) { 357 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 358 ParmVarDecl *Param = 359 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 360 if (Param->hasUnparsedDefaultArg()) { 361 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 362 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 363 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 364 delete Toks; 365 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 366 } else if (Param->getDefaultArg()) { 367 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 368 << Param->getDefaultArg()->getSourceRange(); 369 Param->setDefaultArg(0); 370 } 371 } 372 } 373 } 374} 375 376// MergeCXXFunctionDecl - Merge two declarations of the same C++ 377// function, once we already know that they have the same 378// type. Subroutine of MergeFunctionDecl. Returns true if there was an 379// error, false otherwise. 380bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 381 Scope *S) { 382 bool Invalid = false; 383 384 // C++ [dcl.fct.default]p4: 385 // For non-template functions, default arguments can be added in 386 // later declarations of a function in the same 387 // scope. Declarations in different scopes have completely 388 // distinct sets of default arguments. That is, declarations in 389 // inner scopes do not acquire default arguments from 390 // declarations in outer scopes, and vice versa. In a given 391 // function declaration, all parameters subsequent to a 392 // parameter with a default argument shall have default 393 // arguments supplied in this or previous declarations. A 394 // default argument shall not be redefined by a later 395 // declaration (not even to the same value). 396 // 397 // C++ [dcl.fct.default]p6: 398 // Except for member functions of class templates, the default arguments 399 // in a member function definition that appears outside of the class 400 // definition are added to the set of default arguments provided by the 401 // member function declaration in the class definition. 402 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 403 ParmVarDecl *OldParam = Old->getParamDecl(p); 404 ParmVarDecl *NewParam = New->getParamDecl(p); 405 406 bool OldParamHasDfl = OldParam->hasDefaultArg(); 407 bool NewParamHasDfl = NewParam->hasDefaultArg(); 408 409 NamedDecl *ND = Old; 410 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 411 // Ignore default parameters of old decl if they are not in 412 // the same scope. 413 OldParamHasDfl = false; 414 415 if (OldParamHasDfl && NewParamHasDfl) { 416 417 unsigned DiagDefaultParamID = 418 diag::err_param_default_argument_redefinition; 419 420 // MSVC accepts that default parameters be redefined for member functions 421 // of template class. The new default parameter's value is ignored. 422 Invalid = true; 423 if (getLangOpts().MicrosoftExt) { 424 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 425 if (MD && MD->getParent()->getDescribedClassTemplate()) { 426 // Merge the old default argument into the new parameter. 427 NewParam->setHasInheritedDefaultArg(); 428 if (OldParam->hasUninstantiatedDefaultArg()) 429 NewParam->setUninstantiatedDefaultArg( 430 OldParam->getUninstantiatedDefaultArg()); 431 else 432 NewParam->setDefaultArg(OldParam->getInit()); 433 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 434 Invalid = false; 435 } 436 } 437 438 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 439 // hint here. Alternatively, we could walk the type-source information 440 // for NewParam to find the last source location in the type... but it 441 // isn't worth the effort right now. This is the kind of test case that 442 // is hard to get right: 443 // int f(int); 444 // void g(int (*fp)(int) = f); 445 // void g(int (*fp)(int) = &f); 446 Diag(NewParam->getLocation(), DiagDefaultParamID) 447 << NewParam->getDefaultArgRange(); 448 449 // Look for the function declaration where the default argument was 450 // actually written, which may be a declaration prior to Old. 451 for (FunctionDecl *Older = Old->getPreviousDecl(); 452 Older; Older = Older->getPreviousDecl()) { 453 if (!Older->getParamDecl(p)->hasDefaultArg()) 454 break; 455 456 OldParam = Older->getParamDecl(p); 457 } 458 459 Diag(OldParam->getLocation(), diag::note_previous_definition) 460 << OldParam->getDefaultArgRange(); 461 } else if (OldParamHasDfl) { 462 // Merge the old default argument into the new parameter. 463 // It's important to use getInit() here; getDefaultArg() 464 // strips off any top-level ExprWithCleanups. 465 NewParam->setHasInheritedDefaultArg(); 466 if (OldParam->hasUninstantiatedDefaultArg()) 467 NewParam->setUninstantiatedDefaultArg( 468 OldParam->getUninstantiatedDefaultArg()); 469 else 470 NewParam->setDefaultArg(OldParam->getInit()); 471 } else if (NewParamHasDfl) { 472 if (New->getDescribedFunctionTemplate()) { 473 // Paragraph 4, quoted above, only applies to non-template functions. 474 Diag(NewParam->getLocation(), 475 diag::err_param_default_argument_template_redecl) 476 << NewParam->getDefaultArgRange(); 477 Diag(Old->getLocation(), diag::note_template_prev_declaration) 478 << false; 479 } else if (New->getTemplateSpecializationKind() 480 != TSK_ImplicitInstantiation && 481 New->getTemplateSpecializationKind() != TSK_Undeclared) { 482 // C++ [temp.expr.spec]p21: 483 // Default function arguments shall not be specified in a declaration 484 // or a definition for one of the following explicit specializations: 485 // - the explicit specialization of a function template; 486 // - the explicit specialization of a member function template; 487 // - the explicit specialization of a member function of a class 488 // template where the class template specialization to which the 489 // member function specialization belongs is implicitly 490 // instantiated. 491 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 492 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 493 << New->getDeclName() 494 << NewParam->getDefaultArgRange(); 495 } else if (New->getDeclContext()->isDependentContext()) { 496 // C++ [dcl.fct.default]p6 (DR217): 497 // Default arguments for a member function of a class template shall 498 // be specified on the initial declaration of the member function 499 // within the class template. 500 // 501 // Reading the tea leaves a bit in DR217 and its reference to DR205 502 // leads me to the conclusion that one cannot add default function 503 // arguments for an out-of-line definition of a member function of a 504 // dependent type. 505 int WhichKind = 2; 506 if (CXXRecordDecl *Record 507 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 508 if (Record->getDescribedClassTemplate()) 509 WhichKind = 0; 510 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 511 WhichKind = 1; 512 else 513 WhichKind = 2; 514 } 515 516 Diag(NewParam->getLocation(), 517 diag::err_param_default_argument_member_template_redecl) 518 << WhichKind 519 << NewParam->getDefaultArgRange(); 520 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 521 CXXSpecialMember NewSM = getSpecialMember(Ctor), 522 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 523 if (NewSM != OldSM) { 524 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 525 << NewParam->getDefaultArgRange() << NewSM; 526 Diag(Old->getLocation(), diag::note_previous_declaration_special) 527 << OldSM; 528 } 529 } 530 } 531 } 532 533 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 534 // template has a constexpr specifier then all its declarations shall 535 // contain the constexpr specifier. 536 if (New->isConstexpr() != Old->isConstexpr()) { 537 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 538 << New << New->isConstexpr(); 539 Diag(Old->getLocation(), diag::note_previous_declaration); 540 Invalid = true; 541 } 542 543 if (CheckEquivalentExceptionSpec(Old, New)) 544 Invalid = true; 545 546 return Invalid; 547} 548 549/// \brief Merge the exception specifications of two variable declarations. 550/// 551/// This is called when there's a redeclaration of a VarDecl. The function 552/// checks if the redeclaration might have an exception specification and 553/// validates compatibility and merges the specs if necessary. 554void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 555 // Shortcut if exceptions are disabled. 556 if (!getLangOpts().CXXExceptions) 557 return; 558 559 assert(Context.hasSameType(New->getType(), Old->getType()) && 560 "Should only be called if types are otherwise the same."); 561 562 QualType NewType = New->getType(); 563 QualType OldType = Old->getType(); 564 565 // We're only interested in pointers and references to functions, as well 566 // as pointers to member functions. 567 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 568 NewType = R->getPointeeType(); 569 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 570 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 571 NewType = P->getPointeeType(); 572 OldType = OldType->getAs<PointerType>()->getPointeeType(); 573 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 574 NewType = M->getPointeeType(); 575 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 576 } 577 578 if (!NewType->isFunctionProtoType()) 579 return; 580 581 // There's lots of special cases for functions. For function pointers, system 582 // libraries are hopefully not as broken so that we don't need these 583 // workarounds. 584 if (CheckEquivalentExceptionSpec( 585 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 586 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 587 New->setInvalidDecl(); 588 } 589} 590 591/// CheckCXXDefaultArguments - Verify that the default arguments for a 592/// function declaration are well-formed according to C++ 593/// [dcl.fct.default]. 594void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 595 unsigned NumParams = FD->getNumParams(); 596 unsigned p; 597 598 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 599 isa<CXXMethodDecl>(FD) && 600 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 601 602 // Find first parameter with a default argument 603 for (p = 0; p < NumParams; ++p) { 604 ParmVarDecl *Param = FD->getParamDecl(p); 605 if (Param->hasDefaultArg()) { 606 // C++11 [expr.prim.lambda]p5: 607 // [...] Default arguments (8.3.6) shall not be specified in the 608 // parameter-declaration-clause of a lambda-declarator. 609 // 610 // FIXME: Core issue 974 strikes this sentence, we only provide an 611 // extension warning. 612 if (IsLambda) 613 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 614 << Param->getDefaultArgRange(); 615 break; 616 } 617 } 618 619 // C++ [dcl.fct.default]p4: 620 // In a given function declaration, all parameters 621 // subsequent to a parameter with a default argument shall 622 // have default arguments supplied in this or previous 623 // declarations. A default argument shall not be redefined 624 // by a later declaration (not even to the same value). 625 unsigned LastMissingDefaultArg = 0; 626 for (; p < NumParams; ++p) { 627 ParmVarDecl *Param = FD->getParamDecl(p); 628 if (!Param->hasDefaultArg()) { 629 if (Param->isInvalidDecl()) 630 /* We already complained about this parameter. */; 631 else if (Param->getIdentifier()) 632 Diag(Param->getLocation(), 633 diag::err_param_default_argument_missing_name) 634 << Param->getIdentifier(); 635 else 636 Diag(Param->getLocation(), 637 diag::err_param_default_argument_missing); 638 639 LastMissingDefaultArg = p; 640 } 641 } 642 643 if (LastMissingDefaultArg > 0) { 644 // Some default arguments were missing. Clear out all of the 645 // default arguments up to (and including) the last missing 646 // default argument, so that we leave the function parameters 647 // in a semantically valid state. 648 for (p = 0; p <= LastMissingDefaultArg; ++p) { 649 ParmVarDecl *Param = FD->getParamDecl(p); 650 if (Param->hasDefaultArg()) { 651 Param->setDefaultArg(0); 652 } 653 } 654 } 655} 656 657// CheckConstexprParameterTypes - Check whether a function's parameter types 658// are all literal types. If so, return true. If not, produce a suitable 659// diagnostic and return false. 660static bool CheckConstexprParameterTypes(Sema &SemaRef, 661 const FunctionDecl *FD) { 662 unsigned ArgIndex = 0; 663 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 664 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 665 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 666 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 667 SourceLocation ParamLoc = PD->getLocation(); 668 if (!(*i)->isDependentType() && 669 SemaRef.RequireLiteralType(ParamLoc, *i, 670 diag::err_constexpr_non_literal_param, 671 ArgIndex+1, PD->getSourceRange(), 672 isa<CXXConstructorDecl>(FD))) 673 return false; 674 } 675 return true; 676} 677 678// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 679// the requirements of a constexpr function definition or a constexpr 680// constructor definition. If so, return true. If not, produce appropriate 681// diagnostics and return false. 682// 683// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 684bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 685 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 686 if (MD && MD->isInstance()) { 687 // C++11 [dcl.constexpr]p4: 688 // The definition of a constexpr constructor shall satisfy the following 689 // constraints: 690 // - the class shall not have any virtual base classes; 691 const CXXRecordDecl *RD = MD->getParent(); 692 if (RD->getNumVBases()) { 693 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 694 << isa<CXXConstructorDecl>(NewFD) << RD->isStruct() 695 << RD->getNumVBases(); 696 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 697 E = RD->vbases_end(); I != E; ++I) 698 Diag(I->getLocStart(), 699 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 700 return false; 701 } 702 } 703 704 if (!isa<CXXConstructorDecl>(NewFD)) { 705 // C++11 [dcl.constexpr]p3: 706 // The definition of a constexpr function shall satisfy the following 707 // constraints: 708 // - it shall not be virtual; 709 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 710 if (Method && Method->isVirtual()) { 711 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 712 713 // If it's not obvious why this function is virtual, find an overridden 714 // function which uses the 'virtual' keyword. 715 const CXXMethodDecl *WrittenVirtual = Method; 716 while (!WrittenVirtual->isVirtualAsWritten()) 717 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 718 if (WrittenVirtual != Method) 719 Diag(WrittenVirtual->getLocation(), 720 diag::note_overridden_virtual_function); 721 return false; 722 } 723 724 // - its return type shall be a literal type; 725 QualType RT = NewFD->getResultType(); 726 if (!RT->isDependentType() && 727 RequireLiteralType(NewFD->getLocation(), RT, 728 diag::err_constexpr_non_literal_return)) 729 return false; 730 } 731 732 // - each of its parameter types shall be a literal type; 733 if (!CheckConstexprParameterTypes(*this, NewFD)) 734 return false; 735 736 return true; 737} 738 739/// Check the given declaration statement is legal within a constexpr function 740/// body. C++0x [dcl.constexpr]p3,p4. 741/// 742/// \return true if the body is OK, false if we have diagnosed a problem. 743static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 744 DeclStmt *DS) { 745 // C++0x [dcl.constexpr]p3 and p4: 746 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 747 // contain only 748 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 749 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 750 switch ((*DclIt)->getKind()) { 751 case Decl::StaticAssert: 752 case Decl::Using: 753 case Decl::UsingShadow: 754 case Decl::UsingDirective: 755 case Decl::UnresolvedUsingTypename: 756 // - static_assert-declarations 757 // - using-declarations, 758 // - using-directives, 759 continue; 760 761 case Decl::Typedef: 762 case Decl::TypeAlias: { 763 // - typedef declarations and alias-declarations that do not define 764 // classes or enumerations, 765 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 766 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 767 // Don't allow variably-modified types in constexpr functions. 768 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 769 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 770 << TL.getSourceRange() << TL.getType() 771 << isa<CXXConstructorDecl>(Dcl); 772 return false; 773 } 774 continue; 775 } 776 777 case Decl::Enum: 778 case Decl::CXXRecord: 779 // As an extension, we allow the declaration (but not the definition) of 780 // classes and enumerations in all declarations, not just in typedef and 781 // alias declarations. 782 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 783 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 784 << isa<CXXConstructorDecl>(Dcl); 785 return false; 786 } 787 continue; 788 789 case Decl::Var: 790 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 791 << isa<CXXConstructorDecl>(Dcl); 792 return false; 793 794 default: 795 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 796 << isa<CXXConstructorDecl>(Dcl); 797 return false; 798 } 799 } 800 801 return true; 802} 803 804/// Check that the given field is initialized within a constexpr constructor. 805/// 806/// \param Dcl The constexpr constructor being checked. 807/// \param Field The field being checked. This may be a member of an anonymous 808/// struct or union nested within the class being checked. 809/// \param Inits All declarations, including anonymous struct/union members and 810/// indirect members, for which any initialization was provided. 811/// \param Diagnosed Set to true if an error is produced. 812static void CheckConstexprCtorInitializer(Sema &SemaRef, 813 const FunctionDecl *Dcl, 814 FieldDecl *Field, 815 llvm::SmallSet<Decl*, 16> &Inits, 816 bool &Diagnosed) { 817 if (Field->isUnnamedBitfield()) 818 return; 819 820 if (Field->isAnonymousStructOrUnion() && 821 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 822 return; 823 824 if (!Inits.count(Field)) { 825 if (!Diagnosed) { 826 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 827 Diagnosed = true; 828 } 829 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 830 } else if (Field->isAnonymousStructOrUnion()) { 831 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 832 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 833 I != E; ++I) 834 // If an anonymous union contains an anonymous struct of which any member 835 // is initialized, all members must be initialized. 836 if (!RD->isUnion() || Inits.count(&*I)) 837 CheckConstexprCtorInitializer(SemaRef, Dcl, &*I, Inits, Diagnosed); 838 } 839} 840 841/// Check the body for the given constexpr function declaration only contains 842/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 843/// 844/// \return true if the body is OK, false if we have diagnosed a problem. 845bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 846 if (isa<CXXTryStmt>(Body)) { 847 // C++11 [dcl.constexpr]p3: 848 // The definition of a constexpr function shall satisfy the following 849 // constraints: [...] 850 // - its function-body shall be = delete, = default, or a 851 // compound-statement 852 // 853 // C++11 [dcl.constexpr]p4: 854 // In the definition of a constexpr constructor, [...] 855 // - its function-body shall not be a function-try-block; 856 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 857 << isa<CXXConstructorDecl>(Dcl); 858 return false; 859 } 860 861 // - its function-body shall be [...] a compound-statement that contains only 862 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 863 864 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 865 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 866 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 867 switch ((*BodyIt)->getStmtClass()) { 868 case Stmt::NullStmtClass: 869 // - null statements, 870 continue; 871 872 case Stmt::DeclStmtClass: 873 // - static_assert-declarations 874 // - using-declarations, 875 // - using-directives, 876 // - typedef declarations and alias-declarations that do not define 877 // classes or enumerations, 878 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 879 return false; 880 continue; 881 882 case Stmt::ReturnStmtClass: 883 // - and exactly one return statement; 884 if (isa<CXXConstructorDecl>(Dcl)) 885 break; 886 887 ReturnStmts.push_back((*BodyIt)->getLocStart()); 888 continue; 889 890 default: 891 break; 892 } 893 894 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 895 << isa<CXXConstructorDecl>(Dcl); 896 return false; 897 } 898 899 if (const CXXConstructorDecl *Constructor 900 = dyn_cast<CXXConstructorDecl>(Dcl)) { 901 const CXXRecordDecl *RD = Constructor->getParent(); 902 // DR1359: 903 // - every non-variant non-static data member and base class sub-object 904 // shall be initialized; 905 // - if the class is a non-empty union, or for each non-empty anonymous 906 // union member of a non-union class, exactly one non-static data member 907 // shall be initialized; 908 if (RD->isUnion()) { 909 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 910 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 911 return false; 912 } 913 } else if (!Constructor->isDependentContext() && 914 !Constructor->isDelegatingConstructor()) { 915 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 916 917 // Skip detailed checking if we have enough initializers, and we would 918 // allow at most one initializer per member. 919 bool AnyAnonStructUnionMembers = false; 920 unsigned Fields = 0; 921 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 922 E = RD->field_end(); I != E; ++I, ++Fields) { 923 if (I->isAnonymousStructOrUnion()) { 924 AnyAnonStructUnionMembers = true; 925 break; 926 } 927 } 928 if (AnyAnonStructUnionMembers || 929 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 930 // Check initialization of non-static data members. Base classes are 931 // always initialized so do not need to be checked. Dependent bases 932 // might not have initializers in the member initializer list. 933 llvm::SmallSet<Decl*, 16> Inits; 934 for (CXXConstructorDecl::init_const_iterator 935 I = Constructor->init_begin(), E = Constructor->init_end(); 936 I != E; ++I) { 937 if (FieldDecl *FD = (*I)->getMember()) 938 Inits.insert(FD); 939 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 940 Inits.insert(ID->chain_begin(), ID->chain_end()); 941 } 942 943 bool Diagnosed = false; 944 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 945 E = RD->field_end(); I != E; ++I) 946 CheckConstexprCtorInitializer(*this, Dcl, &*I, Inits, Diagnosed); 947 if (Diagnosed) 948 return false; 949 } 950 } 951 } else { 952 if (ReturnStmts.empty()) { 953 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 954 return false; 955 } 956 if (ReturnStmts.size() > 1) { 957 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 958 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 959 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 960 return false; 961 } 962 } 963 964 // C++11 [dcl.constexpr]p5: 965 // if no function argument values exist such that the function invocation 966 // substitution would produce a constant expression, the program is 967 // ill-formed; no diagnostic required. 968 // C++11 [dcl.constexpr]p3: 969 // - every constructor call and implicit conversion used in initializing the 970 // return value shall be one of those allowed in a constant expression. 971 // C++11 [dcl.constexpr]p4: 972 // - every constructor involved in initializing non-static data members and 973 // base class sub-objects shall be a constexpr constructor. 974 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 975 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 976 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 977 << isa<CXXConstructorDecl>(Dcl); 978 for (size_t I = 0, N = Diags.size(); I != N; ++I) 979 Diag(Diags[I].first, Diags[I].second); 980 return false; 981 } 982 983 return true; 984} 985 986/// isCurrentClassName - Determine whether the identifier II is the 987/// name of the class type currently being defined. In the case of 988/// nested classes, this will only return true if II is the name of 989/// the innermost class. 990bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 991 const CXXScopeSpec *SS) { 992 assert(getLangOpts().CPlusPlus && "No class names in C!"); 993 994 CXXRecordDecl *CurDecl; 995 if (SS && SS->isSet() && !SS->isInvalid()) { 996 DeclContext *DC = computeDeclContext(*SS, true); 997 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 998 } else 999 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1000 1001 if (CurDecl && CurDecl->getIdentifier()) 1002 return &II == CurDecl->getIdentifier(); 1003 else 1004 return false; 1005} 1006 1007/// \brief Check the validity of a C++ base class specifier. 1008/// 1009/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1010/// and returns NULL otherwise. 1011CXXBaseSpecifier * 1012Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1013 SourceRange SpecifierRange, 1014 bool Virtual, AccessSpecifier Access, 1015 TypeSourceInfo *TInfo, 1016 SourceLocation EllipsisLoc) { 1017 QualType BaseType = TInfo->getType(); 1018 1019 // C++ [class.union]p1: 1020 // A union shall not have base classes. 1021 if (Class->isUnion()) { 1022 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1023 << SpecifierRange; 1024 return 0; 1025 } 1026 1027 if (EllipsisLoc.isValid() && 1028 !TInfo->getType()->containsUnexpandedParameterPack()) { 1029 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1030 << TInfo->getTypeLoc().getSourceRange(); 1031 EllipsisLoc = SourceLocation(); 1032 } 1033 1034 if (BaseType->isDependentType()) 1035 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1036 Class->getTagKind() == TTK_Class, 1037 Access, TInfo, EllipsisLoc); 1038 1039 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1040 1041 // Base specifiers must be record types. 1042 if (!BaseType->isRecordType()) { 1043 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1044 return 0; 1045 } 1046 1047 // C++ [class.union]p1: 1048 // A union shall not be used as a base class. 1049 if (BaseType->isUnionType()) { 1050 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1051 return 0; 1052 } 1053 1054 // C++ [class.derived]p2: 1055 // The class-name in a base-specifier shall not be an incompletely 1056 // defined class. 1057 if (RequireCompleteType(BaseLoc, BaseType, 1058 diag::err_incomplete_base_class, SpecifierRange)) { 1059 Class->setInvalidDecl(); 1060 return 0; 1061 } 1062 1063 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1064 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1065 assert(BaseDecl && "Record type has no declaration"); 1066 BaseDecl = BaseDecl->getDefinition(); 1067 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1068 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1069 assert(CXXBaseDecl && "Base type is not a C++ type"); 1070 1071 // C++ [class]p3: 1072 // If a class is marked final and it appears as a base-type-specifier in 1073 // base-clause, the program is ill-formed. 1074 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1075 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1076 << CXXBaseDecl->getDeclName(); 1077 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1078 << CXXBaseDecl->getDeclName(); 1079 return 0; 1080 } 1081 1082 if (BaseDecl->isInvalidDecl()) 1083 Class->setInvalidDecl(); 1084 1085 // Create the base specifier. 1086 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1087 Class->getTagKind() == TTK_Class, 1088 Access, TInfo, EllipsisLoc); 1089} 1090 1091/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1092/// one entry in the base class list of a class specifier, for 1093/// example: 1094/// class foo : public bar, virtual private baz { 1095/// 'public bar' and 'virtual private baz' are each base-specifiers. 1096BaseResult 1097Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1098 bool Virtual, AccessSpecifier Access, 1099 ParsedType basetype, SourceLocation BaseLoc, 1100 SourceLocation EllipsisLoc) { 1101 if (!classdecl) 1102 return true; 1103 1104 AdjustDeclIfTemplate(classdecl); 1105 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1106 if (!Class) 1107 return true; 1108 1109 TypeSourceInfo *TInfo = 0; 1110 GetTypeFromParser(basetype, &TInfo); 1111 1112 if (EllipsisLoc.isInvalid() && 1113 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1114 UPPC_BaseType)) 1115 return true; 1116 1117 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1118 Virtual, Access, TInfo, 1119 EllipsisLoc)) 1120 return BaseSpec; 1121 1122 return true; 1123} 1124 1125/// \brief Performs the actual work of attaching the given base class 1126/// specifiers to a C++ class. 1127bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1128 unsigned NumBases) { 1129 if (NumBases == 0) 1130 return false; 1131 1132 // Used to keep track of which base types we have already seen, so 1133 // that we can properly diagnose redundant direct base types. Note 1134 // that the key is always the unqualified canonical type of the base 1135 // class. 1136 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1137 1138 // Copy non-redundant base specifiers into permanent storage. 1139 unsigned NumGoodBases = 0; 1140 bool Invalid = false; 1141 for (unsigned idx = 0; idx < NumBases; ++idx) { 1142 QualType NewBaseType 1143 = Context.getCanonicalType(Bases[idx]->getType()); 1144 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1145 1146 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1147 if (KnownBase) { 1148 // C++ [class.mi]p3: 1149 // A class shall not be specified as a direct base class of a 1150 // derived class more than once. 1151 Diag(Bases[idx]->getLocStart(), 1152 diag::err_duplicate_base_class) 1153 << KnownBase->getType() 1154 << Bases[idx]->getSourceRange(); 1155 1156 // Delete the duplicate base class specifier; we're going to 1157 // overwrite its pointer later. 1158 Context.Deallocate(Bases[idx]); 1159 1160 Invalid = true; 1161 } else { 1162 // Okay, add this new base class. 1163 KnownBase = Bases[idx]; 1164 Bases[NumGoodBases++] = Bases[idx]; 1165 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1166 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1167 if (RD->hasAttr<WeakAttr>()) 1168 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1169 } 1170 } 1171 1172 // Attach the remaining base class specifiers to the derived class. 1173 Class->setBases(Bases, NumGoodBases); 1174 1175 // Delete the remaining (good) base class specifiers, since their 1176 // data has been copied into the CXXRecordDecl. 1177 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1178 Context.Deallocate(Bases[idx]); 1179 1180 return Invalid; 1181} 1182 1183/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1184/// class, after checking whether there are any duplicate base 1185/// classes. 1186void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1187 unsigned NumBases) { 1188 if (!ClassDecl || !Bases || !NumBases) 1189 return; 1190 1191 AdjustDeclIfTemplate(ClassDecl); 1192 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1193 (CXXBaseSpecifier**)(Bases), NumBases); 1194} 1195 1196static CXXRecordDecl *GetClassForType(QualType T) { 1197 if (const RecordType *RT = T->getAs<RecordType>()) 1198 return cast<CXXRecordDecl>(RT->getDecl()); 1199 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1200 return ICT->getDecl(); 1201 else 1202 return 0; 1203} 1204 1205/// \brief Determine whether the type \p Derived is a C++ class that is 1206/// derived from the type \p Base. 1207bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1208 if (!getLangOpts().CPlusPlus) 1209 return false; 1210 1211 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1212 if (!DerivedRD) 1213 return false; 1214 1215 CXXRecordDecl *BaseRD = GetClassForType(Base); 1216 if (!BaseRD) 1217 return false; 1218 1219 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1220 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1221} 1222 1223/// \brief Determine whether the type \p Derived is a C++ class that is 1224/// derived from the type \p Base. 1225bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1226 if (!getLangOpts().CPlusPlus) 1227 return false; 1228 1229 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1230 if (!DerivedRD) 1231 return false; 1232 1233 CXXRecordDecl *BaseRD = GetClassForType(Base); 1234 if (!BaseRD) 1235 return false; 1236 1237 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1238} 1239 1240void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1241 CXXCastPath &BasePathArray) { 1242 assert(BasePathArray.empty() && "Base path array must be empty!"); 1243 assert(Paths.isRecordingPaths() && "Must record paths!"); 1244 1245 const CXXBasePath &Path = Paths.front(); 1246 1247 // We first go backward and check if we have a virtual base. 1248 // FIXME: It would be better if CXXBasePath had the base specifier for 1249 // the nearest virtual base. 1250 unsigned Start = 0; 1251 for (unsigned I = Path.size(); I != 0; --I) { 1252 if (Path[I - 1].Base->isVirtual()) { 1253 Start = I - 1; 1254 break; 1255 } 1256 } 1257 1258 // Now add all bases. 1259 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1260 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1261} 1262 1263/// \brief Determine whether the given base path includes a virtual 1264/// base class. 1265bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1266 for (CXXCastPath::const_iterator B = BasePath.begin(), 1267 BEnd = BasePath.end(); 1268 B != BEnd; ++B) 1269 if ((*B)->isVirtual()) 1270 return true; 1271 1272 return false; 1273} 1274 1275/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1276/// conversion (where Derived and Base are class types) is 1277/// well-formed, meaning that the conversion is unambiguous (and 1278/// that all of the base classes are accessible). Returns true 1279/// and emits a diagnostic if the code is ill-formed, returns false 1280/// otherwise. Loc is the location where this routine should point to 1281/// if there is an error, and Range is the source range to highlight 1282/// if there is an error. 1283bool 1284Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1285 unsigned InaccessibleBaseID, 1286 unsigned AmbigiousBaseConvID, 1287 SourceLocation Loc, SourceRange Range, 1288 DeclarationName Name, 1289 CXXCastPath *BasePath) { 1290 // First, determine whether the path from Derived to Base is 1291 // ambiguous. This is slightly more expensive than checking whether 1292 // the Derived to Base conversion exists, because here we need to 1293 // explore multiple paths to determine if there is an ambiguity. 1294 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1295 /*DetectVirtual=*/false); 1296 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1297 assert(DerivationOkay && 1298 "Can only be used with a derived-to-base conversion"); 1299 (void)DerivationOkay; 1300 1301 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1302 if (InaccessibleBaseID) { 1303 // Check that the base class can be accessed. 1304 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1305 InaccessibleBaseID)) { 1306 case AR_inaccessible: 1307 return true; 1308 case AR_accessible: 1309 case AR_dependent: 1310 case AR_delayed: 1311 break; 1312 } 1313 } 1314 1315 // Build a base path if necessary. 1316 if (BasePath) 1317 BuildBasePathArray(Paths, *BasePath); 1318 return false; 1319 } 1320 1321 // We know that the derived-to-base conversion is ambiguous, and 1322 // we're going to produce a diagnostic. Perform the derived-to-base 1323 // search just one more time to compute all of the possible paths so 1324 // that we can print them out. This is more expensive than any of 1325 // the previous derived-to-base checks we've done, but at this point 1326 // performance isn't as much of an issue. 1327 Paths.clear(); 1328 Paths.setRecordingPaths(true); 1329 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1330 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1331 (void)StillOkay; 1332 1333 // Build up a textual representation of the ambiguous paths, e.g., 1334 // D -> B -> A, that will be used to illustrate the ambiguous 1335 // conversions in the diagnostic. We only print one of the paths 1336 // to each base class subobject. 1337 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1338 1339 Diag(Loc, AmbigiousBaseConvID) 1340 << Derived << Base << PathDisplayStr << Range << Name; 1341 return true; 1342} 1343 1344bool 1345Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1346 SourceLocation Loc, SourceRange Range, 1347 CXXCastPath *BasePath, 1348 bool IgnoreAccess) { 1349 return CheckDerivedToBaseConversion(Derived, Base, 1350 IgnoreAccess ? 0 1351 : diag::err_upcast_to_inaccessible_base, 1352 diag::err_ambiguous_derived_to_base_conv, 1353 Loc, Range, DeclarationName(), 1354 BasePath); 1355} 1356 1357 1358/// @brief Builds a string representing ambiguous paths from a 1359/// specific derived class to different subobjects of the same base 1360/// class. 1361/// 1362/// This function builds a string that can be used in error messages 1363/// to show the different paths that one can take through the 1364/// inheritance hierarchy to go from the derived class to different 1365/// subobjects of a base class. The result looks something like this: 1366/// @code 1367/// struct D -> struct B -> struct A 1368/// struct D -> struct C -> struct A 1369/// @endcode 1370std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1371 std::string PathDisplayStr; 1372 std::set<unsigned> DisplayedPaths; 1373 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1374 Path != Paths.end(); ++Path) { 1375 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1376 // We haven't displayed a path to this particular base 1377 // class subobject yet. 1378 PathDisplayStr += "\n "; 1379 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1380 for (CXXBasePath::const_iterator Element = Path->begin(); 1381 Element != Path->end(); ++Element) 1382 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1383 } 1384 } 1385 1386 return PathDisplayStr; 1387} 1388 1389//===----------------------------------------------------------------------===// 1390// C++ class member Handling 1391//===----------------------------------------------------------------------===// 1392 1393/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1394bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1395 SourceLocation ASLoc, 1396 SourceLocation ColonLoc, 1397 AttributeList *Attrs) { 1398 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1399 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1400 ASLoc, ColonLoc); 1401 CurContext->addHiddenDecl(ASDecl); 1402 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1403} 1404 1405/// CheckOverrideControl - Check C++0x override control semantics. 1406void Sema::CheckOverrideControl(const Decl *D) { 1407 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1408 if (!MD || !MD->isVirtual()) 1409 return; 1410 1411 if (MD->isDependentContext()) 1412 return; 1413 1414 // C++0x [class.virtual]p3: 1415 // If a virtual function is marked with the virt-specifier override and does 1416 // not override a member function of a base class, 1417 // the program is ill-formed. 1418 bool HasOverriddenMethods = 1419 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1420 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1421 Diag(MD->getLocation(), 1422 diag::err_function_marked_override_not_overriding) 1423 << MD->getDeclName(); 1424 return; 1425 } 1426} 1427 1428/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1429/// function overrides a virtual member function marked 'final', according to 1430/// C++0x [class.virtual]p3. 1431bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1432 const CXXMethodDecl *Old) { 1433 if (!Old->hasAttr<FinalAttr>()) 1434 return false; 1435 1436 Diag(New->getLocation(), diag::err_final_function_overridden) 1437 << New->getDeclName(); 1438 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1439 return true; 1440} 1441 1442/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1443/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1444/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1445/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1446/// present but parsing it has been deferred. 1447Decl * 1448Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1449 MultiTemplateParamsArg TemplateParameterLists, 1450 Expr *BW, const VirtSpecifiers &VS, 1451 bool HasDeferredInit) { 1452 const DeclSpec &DS = D.getDeclSpec(); 1453 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1454 DeclarationName Name = NameInfo.getName(); 1455 SourceLocation Loc = NameInfo.getLoc(); 1456 1457 // For anonymous bitfields, the location should point to the type. 1458 if (Loc.isInvalid()) 1459 Loc = D.getLocStart(); 1460 1461 Expr *BitWidth = static_cast<Expr*>(BW); 1462 1463 assert(isa<CXXRecordDecl>(CurContext)); 1464 assert(!DS.isFriendSpecified()); 1465 1466 bool isFunc = D.isDeclarationOfFunction(); 1467 1468 // C++ 9.2p6: A member shall not be declared to have automatic storage 1469 // duration (auto, register) or with the extern storage-class-specifier. 1470 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1471 // data members and cannot be applied to names declared const or static, 1472 // and cannot be applied to reference members. 1473 switch (DS.getStorageClassSpec()) { 1474 case DeclSpec::SCS_unspecified: 1475 case DeclSpec::SCS_typedef: 1476 case DeclSpec::SCS_static: 1477 // FALL THROUGH. 1478 break; 1479 case DeclSpec::SCS_mutable: 1480 if (isFunc) { 1481 if (DS.getStorageClassSpecLoc().isValid()) 1482 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1483 else 1484 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1485 1486 // FIXME: It would be nicer if the keyword was ignored only for this 1487 // declarator. Otherwise we could get follow-up errors. 1488 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1489 } 1490 break; 1491 default: 1492 if (DS.getStorageClassSpecLoc().isValid()) 1493 Diag(DS.getStorageClassSpecLoc(), 1494 diag::err_storageclass_invalid_for_member); 1495 else 1496 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1497 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1498 } 1499 1500 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1501 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1502 !isFunc); 1503 1504 Decl *Member; 1505 if (isInstField) { 1506 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1507 1508 // Data members must have identifiers for names. 1509 if (Name.getNameKind() != DeclarationName::Identifier) { 1510 Diag(Loc, diag::err_bad_variable_name) 1511 << Name; 1512 return 0; 1513 } 1514 1515 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1516 1517 // Member field could not be with "template" keyword. 1518 // So TemplateParameterLists should be empty in this case. 1519 if (TemplateParameterLists.size()) { 1520 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1521 if (TemplateParams->size()) { 1522 // There is no such thing as a member field template. 1523 Diag(D.getIdentifierLoc(), diag::err_template_member) 1524 << II 1525 << SourceRange(TemplateParams->getTemplateLoc(), 1526 TemplateParams->getRAngleLoc()); 1527 } else { 1528 // There is an extraneous 'template<>' for this member. 1529 Diag(TemplateParams->getTemplateLoc(), 1530 diag::err_template_member_noparams) 1531 << II 1532 << SourceRange(TemplateParams->getTemplateLoc(), 1533 TemplateParams->getRAngleLoc()); 1534 } 1535 return 0; 1536 } 1537 1538 if (SS.isSet() && !SS.isInvalid()) { 1539 // The user provided a superfluous scope specifier inside a class 1540 // definition: 1541 // 1542 // class X { 1543 // int X::member; 1544 // }; 1545 if (DeclContext *DC = computeDeclContext(SS, false)) 1546 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1547 else 1548 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1549 << Name << SS.getRange(); 1550 1551 SS.clear(); 1552 } 1553 1554 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1555 HasDeferredInit, AS); 1556 assert(Member && "HandleField never returns null"); 1557 } else { 1558 assert(!HasDeferredInit); 1559 1560 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1561 if (!Member) { 1562 return 0; 1563 } 1564 1565 // Non-instance-fields can't have a bitfield. 1566 if (BitWidth) { 1567 if (Member->isInvalidDecl()) { 1568 // don't emit another diagnostic. 1569 } else if (isa<VarDecl>(Member)) { 1570 // C++ 9.6p3: A bit-field shall not be a static member. 1571 // "static member 'A' cannot be a bit-field" 1572 Diag(Loc, diag::err_static_not_bitfield) 1573 << Name << BitWidth->getSourceRange(); 1574 } else if (isa<TypedefDecl>(Member)) { 1575 // "typedef member 'x' cannot be a bit-field" 1576 Diag(Loc, diag::err_typedef_not_bitfield) 1577 << Name << BitWidth->getSourceRange(); 1578 } else { 1579 // A function typedef ("typedef int f(); f a;"). 1580 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1581 Diag(Loc, diag::err_not_integral_type_bitfield) 1582 << Name << cast<ValueDecl>(Member)->getType() 1583 << BitWidth->getSourceRange(); 1584 } 1585 1586 BitWidth = 0; 1587 Member->setInvalidDecl(); 1588 } 1589 1590 Member->setAccess(AS); 1591 1592 // If we have declared a member function template, set the access of the 1593 // templated declaration as well. 1594 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1595 FunTmpl->getTemplatedDecl()->setAccess(AS); 1596 } 1597 1598 if (VS.isOverrideSpecified()) { 1599 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1600 if (!MD || !MD->isVirtual()) { 1601 Diag(Member->getLocStart(), 1602 diag::override_keyword_only_allowed_on_virtual_member_functions) 1603 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1604 } else 1605 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1606 } 1607 if (VS.isFinalSpecified()) { 1608 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1609 if (!MD || !MD->isVirtual()) { 1610 Diag(Member->getLocStart(), 1611 diag::override_keyword_only_allowed_on_virtual_member_functions) 1612 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1613 } else 1614 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1615 } 1616 1617 if (VS.getLastLocation().isValid()) { 1618 // Update the end location of a method that has a virt-specifiers. 1619 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1620 MD->setRangeEnd(VS.getLastLocation()); 1621 } 1622 1623 CheckOverrideControl(Member); 1624 1625 assert((Name || isInstField) && "No identifier for non-field ?"); 1626 1627 if (isInstField) 1628 FieldCollector->Add(cast<FieldDecl>(Member)); 1629 return Member; 1630} 1631 1632/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1633/// in-class initializer for a non-static C++ class member, and after 1634/// instantiating an in-class initializer in a class template. Such actions 1635/// are deferred until the class is complete. 1636void 1637Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1638 Expr *InitExpr) { 1639 FieldDecl *FD = cast<FieldDecl>(D); 1640 1641 if (!InitExpr) { 1642 FD->setInvalidDecl(); 1643 FD->removeInClassInitializer(); 1644 return; 1645 } 1646 1647 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1648 FD->setInvalidDecl(); 1649 FD->removeInClassInitializer(); 1650 return; 1651 } 1652 1653 ExprResult Init = InitExpr; 1654 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1655 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1656 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1657 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1658 } 1659 Expr **Inits = &InitExpr; 1660 unsigned NumInits = 1; 1661 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1662 InitializationKind Kind = EqualLoc.isInvalid() 1663 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1664 : InitializationKind::CreateCopy(InitExpr->getLocStart(), EqualLoc); 1665 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1666 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1667 if (Init.isInvalid()) { 1668 FD->setInvalidDecl(); 1669 return; 1670 } 1671 1672 CheckImplicitConversions(Init.get(), EqualLoc); 1673 } 1674 1675 // C++0x [class.base.init]p7: 1676 // The initialization of each base and member constitutes a 1677 // full-expression. 1678 Init = MaybeCreateExprWithCleanups(Init); 1679 if (Init.isInvalid()) { 1680 FD->setInvalidDecl(); 1681 return; 1682 } 1683 1684 InitExpr = Init.release(); 1685 1686 FD->setInClassInitializer(InitExpr); 1687} 1688 1689/// \brief Find the direct and/or virtual base specifiers that 1690/// correspond to the given base type, for use in base initialization 1691/// within a constructor. 1692static bool FindBaseInitializer(Sema &SemaRef, 1693 CXXRecordDecl *ClassDecl, 1694 QualType BaseType, 1695 const CXXBaseSpecifier *&DirectBaseSpec, 1696 const CXXBaseSpecifier *&VirtualBaseSpec) { 1697 // First, check for a direct base class. 1698 DirectBaseSpec = 0; 1699 for (CXXRecordDecl::base_class_const_iterator Base 1700 = ClassDecl->bases_begin(); 1701 Base != ClassDecl->bases_end(); ++Base) { 1702 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1703 // We found a direct base of this type. That's what we're 1704 // initializing. 1705 DirectBaseSpec = &*Base; 1706 break; 1707 } 1708 } 1709 1710 // Check for a virtual base class. 1711 // FIXME: We might be able to short-circuit this if we know in advance that 1712 // there are no virtual bases. 1713 VirtualBaseSpec = 0; 1714 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1715 // We haven't found a base yet; search the class hierarchy for a 1716 // virtual base class. 1717 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1718 /*DetectVirtual=*/false); 1719 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1720 BaseType, Paths)) { 1721 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1722 Path != Paths.end(); ++Path) { 1723 if (Path->back().Base->isVirtual()) { 1724 VirtualBaseSpec = Path->back().Base; 1725 break; 1726 } 1727 } 1728 } 1729 } 1730 1731 return DirectBaseSpec || VirtualBaseSpec; 1732} 1733 1734/// \brief Handle a C++ member initializer using braced-init-list syntax. 1735MemInitResult 1736Sema::ActOnMemInitializer(Decl *ConstructorD, 1737 Scope *S, 1738 CXXScopeSpec &SS, 1739 IdentifierInfo *MemberOrBase, 1740 ParsedType TemplateTypeTy, 1741 const DeclSpec &DS, 1742 SourceLocation IdLoc, 1743 Expr *InitList, 1744 SourceLocation EllipsisLoc) { 1745 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1746 DS, IdLoc, InitList, 1747 EllipsisLoc); 1748} 1749 1750/// \brief Handle a C++ member initializer using parentheses syntax. 1751MemInitResult 1752Sema::ActOnMemInitializer(Decl *ConstructorD, 1753 Scope *S, 1754 CXXScopeSpec &SS, 1755 IdentifierInfo *MemberOrBase, 1756 ParsedType TemplateTypeTy, 1757 const DeclSpec &DS, 1758 SourceLocation IdLoc, 1759 SourceLocation LParenLoc, 1760 Expr **Args, unsigned NumArgs, 1761 SourceLocation RParenLoc, 1762 SourceLocation EllipsisLoc) { 1763 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1764 RParenLoc); 1765 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1766 DS, IdLoc, List, EllipsisLoc); 1767} 1768 1769namespace { 1770 1771// Callback to only accept typo corrections that can be a valid C++ member 1772// intializer: either a non-static field member or a base class. 1773class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1774 public: 1775 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1776 : ClassDecl(ClassDecl) {} 1777 1778 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1779 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1780 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1781 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1782 else 1783 return isa<TypeDecl>(ND); 1784 } 1785 return false; 1786 } 1787 1788 private: 1789 CXXRecordDecl *ClassDecl; 1790}; 1791 1792} 1793 1794/// \brief Handle a C++ member initializer. 1795MemInitResult 1796Sema::BuildMemInitializer(Decl *ConstructorD, 1797 Scope *S, 1798 CXXScopeSpec &SS, 1799 IdentifierInfo *MemberOrBase, 1800 ParsedType TemplateTypeTy, 1801 const DeclSpec &DS, 1802 SourceLocation IdLoc, 1803 Expr *Init, 1804 SourceLocation EllipsisLoc) { 1805 if (!ConstructorD) 1806 return true; 1807 1808 AdjustDeclIfTemplate(ConstructorD); 1809 1810 CXXConstructorDecl *Constructor 1811 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1812 if (!Constructor) { 1813 // The user wrote a constructor initializer on a function that is 1814 // not a C++ constructor. Ignore the error for now, because we may 1815 // have more member initializers coming; we'll diagnose it just 1816 // once in ActOnMemInitializers. 1817 return true; 1818 } 1819 1820 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1821 1822 // C++ [class.base.init]p2: 1823 // Names in a mem-initializer-id are looked up in the scope of the 1824 // constructor's class and, if not found in that scope, are looked 1825 // up in the scope containing the constructor's definition. 1826 // [Note: if the constructor's class contains a member with the 1827 // same name as a direct or virtual base class of the class, a 1828 // mem-initializer-id naming the member or base class and composed 1829 // of a single identifier refers to the class member. A 1830 // mem-initializer-id for the hidden base class may be specified 1831 // using a qualified name. ] 1832 if (!SS.getScopeRep() && !TemplateTypeTy) { 1833 // Look for a member, first. 1834 DeclContext::lookup_result Result 1835 = ClassDecl->lookup(MemberOrBase); 1836 if (Result.first != Result.second) { 1837 ValueDecl *Member; 1838 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1839 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1840 if (EllipsisLoc.isValid()) 1841 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1842 << MemberOrBase 1843 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1844 1845 return BuildMemberInitializer(Member, Init, IdLoc); 1846 } 1847 } 1848 } 1849 // It didn't name a member, so see if it names a class. 1850 QualType BaseType; 1851 TypeSourceInfo *TInfo = 0; 1852 1853 if (TemplateTypeTy) { 1854 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1855 } else if (DS.getTypeSpecType() == TST_decltype) { 1856 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1857 } else { 1858 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1859 LookupParsedName(R, S, &SS); 1860 1861 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1862 if (!TyD) { 1863 if (R.isAmbiguous()) return true; 1864 1865 // We don't want access-control diagnostics here. 1866 R.suppressDiagnostics(); 1867 1868 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1869 bool NotUnknownSpecialization = false; 1870 DeclContext *DC = computeDeclContext(SS, false); 1871 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1872 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1873 1874 if (!NotUnknownSpecialization) { 1875 // When the scope specifier can refer to a member of an unknown 1876 // specialization, we take it as a type name. 1877 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1878 SS.getWithLocInContext(Context), 1879 *MemberOrBase, IdLoc); 1880 if (BaseType.isNull()) 1881 return true; 1882 1883 R.clear(); 1884 R.setLookupName(MemberOrBase); 1885 } 1886 } 1887 1888 // If no results were found, try to correct typos. 1889 TypoCorrection Corr; 1890 MemInitializerValidatorCCC Validator(ClassDecl); 1891 if (R.empty() && BaseType.isNull() && 1892 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1893 Validator, ClassDecl))) { 1894 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 1895 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 1896 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1897 // We have found a non-static data member with a similar 1898 // name to what was typed; complain and initialize that 1899 // member. 1900 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1901 << MemberOrBase << true << CorrectedQuotedStr 1902 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1903 Diag(Member->getLocation(), diag::note_previous_decl) 1904 << CorrectedQuotedStr; 1905 1906 return BuildMemberInitializer(Member, Init, IdLoc); 1907 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1908 const CXXBaseSpecifier *DirectBaseSpec; 1909 const CXXBaseSpecifier *VirtualBaseSpec; 1910 if (FindBaseInitializer(*this, ClassDecl, 1911 Context.getTypeDeclType(Type), 1912 DirectBaseSpec, VirtualBaseSpec)) { 1913 // We have found a direct or virtual base class with a 1914 // similar name to what was typed; complain and initialize 1915 // that base class. 1916 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1917 << MemberOrBase << false << CorrectedQuotedStr 1918 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1919 1920 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1921 : VirtualBaseSpec; 1922 Diag(BaseSpec->getLocStart(), 1923 diag::note_base_class_specified_here) 1924 << BaseSpec->getType() 1925 << BaseSpec->getSourceRange(); 1926 1927 TyD = Type; 1928 } 1929 } 1930 } 1931 1932 if (!TyD && BaseType.isNull()) { 1933 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1934 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1935 return true; 1936 } 1937 } 1938 1939 if (BaseType.isNull()) { 1940 BaseType = Context.getTypeDeclType(TyD); 1941 if (SS.isSet()) { 1942 NestedNameSpecifier *Qualifier = 1943 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1944 1945 // FIXME: preserve source range information 1946 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1947 } 1948 } 1949 } 1950 1951 if (!TInfo) 1952 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1953 1954 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 1955} 1956 1957/// Checks a member initializer expression for cases where reference (or 1958/// pointer) members are bound to by-value parameters (or their addresses). 1959static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1960 Expr *Init, 1961 SourceLocation IdLoc) { 1962 QualType MemberTy = Member->getType(); 1963 1964 // We only handle pointers and references currently. 1965 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1966 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1967 return; 1968 1969 const bool IsPointer = MemberTy->isPointerType(); 1970 if (IsPointer) { 1971 if (const UnaryOperator *Op 1972 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1973 // The only case we're worried about with pointers requires taking the 1974 // address. 1975 if (Op->getOpcode() != UO_AddrOf) 1976 return; 1977 1978 Init = Op->getSubExpr(); 1979 } else { 1980 // We only handle address-of expression initializers for pointers. 1981 return; 1982 } 1983 } 1984 1985 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1986 // Taking the address of a temporary will be diagnosed as a hard error. 1987 if (IsPointer) 1988 return; 1989 1990 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1991 << Member << Init->getSourceRange(); 1992 } else if (const DeclRefExpr *DRE 1993 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1994 // We only warn when referring to a non-reference parameter declaration. 1995 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1996 if (!Parameter || Parameter->getType()->isReferenceType()) 1997 return; 1998 1999 S.Diag(Init->getExprLoc(), 2000 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2001 : diag::warn_bind_ref_member_to_parameter) 2002 << Member << Parameter << Init->getSourceRange(); 2003 } else { 2004 // Other initializers are fine. 2005 return; 2006 } 2007 2008 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2009 << (unsigned)IsPointer; 2010} 2011 2012/// Checks an initializer expression for use of uninitialized fields, such as 2013/// containing the field that is being initialized. Returns true if there is an 2014/// uninitialized field was used an updates the SourceLocation parameter; false 2015/// otherwise. 2016static bool InitExprContainsUninitializedFields(const Stmt *S, 2017 const ValueDecl *LhsField, 2018 SourceLocation *L) { 2019 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 2020 2021 if (isa<CallExpr>(S)) { 2022 // Do not descend into function calls or constructors, as the use 2023 // of an uninitialized field may be valid. One would have to inspect 2024 // the contents of the function/ctor to determine if it is safe or not. 2025 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 2026 // may be safe, depending on what the function/ctor does. 2027 return false; 2028 } 2029 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 2030 const NamedDecl *RhsField = ME->getMemberDecl(); 2031 2032 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 2033 // The member expression points to a static data member. 2034 assert(VD->isStaticDataMember() && 2035 "Member points to non-static data member!"); 2036 (void)VD; 2037 return false; 2038 } 2039 2040 if (isa<EnumConstantDecl>(RhsField)) { 2041 // The member expression points to an enum. 2042 return false; 2043 } 2044 2045 if (RhsField == LhsField) { 2046 // Initializing a field with itself. Throw a warning. 2047 // But wait; there are exceptions! 2048 // Exception #1: The field may not belong to this record. 2049 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2050 const Expr *base = ME->getBase(); 2051 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2052 // Even though the field matches, it does not belong to this record. 2053 return false; 2054 } 2055 // None of the exceptions triggered; return true to indicate an 2056 // uninitialized field was used. 2057 *L = ME->getMemberLoc(); 2058 return true; 2059 } 2060 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2061 // sizeof/alignof doesn't reference contents, do not warn. 2062 return false; 2063 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2064 // address-of doesn't reference contents (the pointer may be dereferenced 2065 // in the same expression but it would be rare; and weird). 2066 if (UOE->getOpcode() == UO_AddrOf) 2067 return false; 2068 } 2069 for (Stmt::const_child_range it = S->children(); it; ++it) { 2070 if (!*it) { 2071 // An expression such as 'member(arg ?: "")' may trigger this. 2072 continue; 2073 } 2074 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2075 return true; 2076 } 2077 return false; 2078} 2079 2080MemInitResult 2081Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2082 SourceLocation IdLoc) { 2083 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2084 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2085 assert((DirectMember || IndirectMember) && 2086 "Member must be a FieldDecl or IndirectFieldDecl"); 2087 2088 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2089 return true; 2090 2091 if (Member->isInvalidDecl()) 2092 return true; 2093 2094 // Diagnose value-uses of fields to initialize themselves, e.g. 2095 // foo(foo) 2096 // where foo is not also a parameter to the constructor. 2097 // TODO: implement -Wuninitialized and fold this into that framework. 2098 Expr **Args; 2099 unsigned NumArgs; 2100 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2101 Args = ParenList->getExprs(); 2102 NumArgs = ParenList->getNumExprs(); 2103 } else { 2104 InitListExpr *InitList = cast<InitListExpr>(Init); 2105 Args = InitList->getInits(); 2106 NumArgs = InitList->getNumInits(); 2107 } 2108 for (unsigned i = 0; i < NumArgs; ++i) { 2109 SourceLocation L; 2110 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 2111 // FIXME: Return true in the case when other fields are used before being 2112 // uninitialized. For example, let this field be the i'th field. When 2113 // initializing the i'th field, throw a warning if any of the >= i'th 2114 // fields are used, as they are not yet initialized. 2115 // Right now we are only handling the case where the i'th field uses 2116 // itself in its initializer. 2117 Diag(L, diag::warn_field_is_uninit); 2118 } 2119 } 2120 2121 SourceRange InitRange = Init->getSourceRange(); 2122 2123 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2124 // Can't check initialization for a member of dependent type or when 2125 // any of the arguments are type-dependent expressions. 2126 DiscardCleanupsInEvaluationContext(); 2127 } else { 2128 bool InitList = false; 2129 if (isa<InitListExpr>(Init)) { 2130 InitList = true; 2131 Args = &Init; 2132 NumArgs = 1; 2133 2134 if (isStdInitializerList(Member->getType(), 0)) { 2135 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2136 << /*at end of ctor*/1 << InitRange; 2137 } 2138 } 2139 2140 // Initialize the member. 2141 InitializedEntity MemberEntity = 2142 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2143 : InitializedEntity::InitializeMember(IndirectMember, 0); 2144 InitializationKind Kind = 2145 InitList ? InitializationKind::CreateDirectList(IdLoc) 2146 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2147 InitRange.getEnd()); 2148 2149 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2150 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2151 MultiExprArg(*this, Args, NumArgs), 2152 0); 2153 if (MemberInit.isInvalid()) 2154 return true; 2155 2156 CheckImplicitConversions(MemberInit.get(), 2157 InitRange.getBegin()); 2158 2159 // C++0x [class.base.init]p7: 2160 // The initialization of each base and member constitutes a 2161 // full-expression. 2162 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2163 if (MemberInit.isInvalid()) 2164 return true; 2165 2166 // If we are in a dependent context, template instantiation will 2167 // perform this type-checking again. Just save the arguments that we 2168 // received. 2169 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2170 // of the information that we have about the member 2171 // initializer. However, deconstructing the ASTs is a dicey process, 2172 // and this approach is far more likely to get the corner cases right. 2173 if (CurContext->isDependentContext()) { 2174 // The existing Init will do fine. 2175 } else { 2176 Init = MemberInit.get(); 2177 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2178 } 2179 } 2180 2181 if (DirectMember) { 2182 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2183 InitRange.getBegin(), Init, 2184 InitRange.getEnd()); 2185 } else { 2186 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2187 InitRange.getBegin(), Init, 2188 InitRange.getEnd()); 2189 } 2190} 2191 2192MemInitResult 2193Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2194 CXXRecordDecl *ClassDecl) { 2195 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2196 if (!LangOpts.CPlusPlus0x) 2197 return Diag(NameLoc, diag::err_delegating_ctor) 2198 << TInfo->getTypeLoc().getLocalSourceRange(); 2199 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2200 2201 bool InitList = true; 2202 Expr **Args = &Init; 2203 unsigned NumArgs = 1; 2204 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2205 InitList = false; 2206 Args = ParenList->getExprs(); 2207 NumArgs = ParenList->getNumExprs(); 2208 } 2209 2210 SourceRange InitRange = Init->getSourceRange(); 2211 // Initialize the object. 2212 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2213 QualType(ClassDecl->getTypeForDecl(), 0)); 2214 InitializationKind Kind = 2215 InitList ? InitializationKind::CreateDirectList(NameLoc) 2216 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2217 InitRange.getEnd()); 2218 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2219 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2220 MultiExprArg(*this, Args,NumArgs), 2221 0); 2222 if (DelegationInit.isInvalid()) 2223 return true; 2224 2225 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2226 "Delegating constructor with no target?"); 2227 2228 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2229 2230 // C++0x [class.base.init]p7: 2231 // The initialization of each base and member constitutes a 2232 // full-expression. 2233 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2234 if (DelegationInit.isInvalid()) 2235 return true; 2236 2237 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2238 DelegationInit.takeAs<Expr>(), 2239 InitRange.getEnd()); 2240} 2241 2242MemInitResult 2243Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2244 Expr *Init, CXXRecordDecl *ClassDecl, 2245 SourceLocation EllipsisLoc) { 2246 SourceLocation BaseLoc 2247 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2248 2249 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2250 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2251 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2252 2253 // C++ [class.base.init]p2: 2254 // [...] Unless the mem-initializer-id names a nonstatic data 2255 // member of the constructor's class or a direct or virtual base 2256 // of that class, the mem-initializer is ill-formed. A 2257 // mem-initializer-list can initialize a base class using any 2258 // name that denotes that base class type. 2259 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2260 2261 SourceRange InitRange = Init->getSourceRange(); 2262 if (EllipsisLoc.isValid()) { 2263 // This is a pack expansion. 2264 if (!BaseType->containsUnexpandedParameterPack()) { 2265 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2266 << SourceRange(BaseLoc, InitRange.getEnd()); 2267 2268 EllipsisLoc = SourceLocation(); 2269 } 2270 } else { 2271 // Check for any unexpanded parameter packs. 2272 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2273 return true; 2274 2275 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2276 return true; 2277 } 2278 2279 // Check for direct and virtual base classes. 2280 const CXXBaseSpecifier *DirectBaseSpec = 0; 2281 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2282 if (!Dependent) { 2283 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2284 BaseType)) 2285 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2286 2287 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2288 VirtualBaseSpec); 2289 2290 // C++ [base.class.init]p2: 2291 // Unless the mem-initializer-id names a nonstatic data member of the 2292 // constructor's class or a direct or virtual base of that class, the 2293 // mem-initializer is ill-formed. 2294 if (!DirectBaseSpec && !VirtualBaseSpec) { 2295 // If the class has any dependent bases, then it's possible that 2296 // one of those types will resolve to the same type as 2297 // BaseType. Therefore, just treat this as a dependent base 2298 // class initialization. FIXME: Should we try to check the 2299 // initialization anyway? It seems odd. 2300 if (ClassDecl->hasAnyDependentBases()) 2301 Dependent = true; 2302 else 2303 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2304 << BaseType << Context.getTypeDeclType(ClassDecl) 2305 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2306 } 2307 } 2308 2309 if (Dependent) { 2310 DiscardCleanupsInEvaluationContext(); 2311 2312 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2313 /*IsVirtual=*/false, 2314 InitRange.getBegin(), Init, 2315 InitRange.getEnd(), EllipsisLoc); 2316 } 2317 2318 // C++ [base.class.init]p2: 2319 // If a mem-initializer-id is ambiguous because it designates both 2320 // a direct non-virtual base class and an inherited virtual base 2321 // class, the mem-initializer is ill-formed. 2322 if (DirectBaseSpec && VirtualBaseSpec) 2323 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2324 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2325 2326 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2327 if (!BaseSpec) 2328 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2329 2330 // Initialize the base. 2331 bool InitList = true; 2332 Expr **Args = &Init; 2333 unsigned NumArgs = 1; 2334 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2335 InitList = false; 2336 Args = ParenList->getExprs(); 2337 NumArgs = ParenList->getNumExprs(); 2338 } 2339 2340 InitializedEntity BaseEntity = 2341 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2342 InitializationKind Kind = 2343 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2344 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2345 InitRange.getEnd()); 2346 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2347 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2348 MultiExprArg(*this, Args, NumArgs), 2349 0); 2350 if (BaseInit.isInvalid()) 2351 return true; 2352 2353 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2354 2355 // C++0x [class.base.init]p7: 2356 // The initialization of each base and member constitutes a 2357 // full-expression. 2358 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2359 if (BaseInit.isInvalid()) 2360 return true; 2361 2362 // If we are in a dependent context, template instantiation will 2363 // perform this type-checking again. Just save the arguments that we 2364 // received in a ParenListExpr. 2365 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2366 // of the information that we have about the base 2367 // initializer. However, deconstructing the ASTs is a dicey process, 2368 // and this approach is far more likely to get the corner cases right. 2369 if (CurContext->isDependentContext()) 2370 BaseInit = Owned(Init); 2371 2372 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2373 BaseSpec->isVirtual(), 2374 InitRange.getBegin(), 2375 BaseInit.takeAs<Expr>(), 2376 InitRange.getEnd(), EllipsisLoc); 2377} 2378 2379// Create a static_cast\<T&&>(expr). 2380static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2381 QualType ExprType = E->getType(); 2382 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2383 SourceLocation ExprLoc = E->getLocStart(); 2384 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2385 TargetType, ExprLoc); 2386 2387 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2388 SourceRange(ExprLoc, ExprLoc), 2389 E->getSourceRange()).take(); 2390} 2391 2392/// ImplicitInitializerKind - How an implicit base or member initializer should 2393/// initialize its base or member. 2394enum ImplicitInitializerKind { 2395 IIK_Default, 2396 IIK_Copy, 2397 IIK_Move 2398}; 2399 2400static bool 2401BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2402 ImplicitInitializerKind ImplicitInitKind, 2403 CXXBaseSpecifier *BaseSpec, 2404 bool IsInheritedVirtualBase, 2405 CXXCtorInitializer *&CXXBaseInit) { 2406 InitializedEntity InitEntity 2407 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2408 IsInheritedVirtualBase); 2409 2410 ExprResult BaseInit; 2411 2412 switch (ImplicitInitKind) { 2413 case IIK_Default: { 2414 InitializationKind InitKind 2415 = InitializationKind::CreateDefault(Constructor->getLocation()); 2416 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2417 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2418 MultiExprArg(SemaRef, 0, 0)); 2419 break; 2420 } 2421 2422 case IIK_Move: 2423 case IIK_Copy: { 2424 bool Moving = ImplicitInitKind == IIK_Move; 2425 ParmVarDecl *Param = Constructor->getParamDecl(0); 2426 QualType ParamType = Param->getType().getNonReferenceType(); 2427 2428 Expr *CopyCtorArg = 2429 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2430 SourceLocation(), Param, false, 2431 Constructor->getLocation(), ParamType, 2432 VK_LValue, 0); 2433 2434 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2435 2436 // Cast to the base class to avoid ambiguities. 2437 QualType ArgTy = 2438 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2439 ParamType.getQualifiers()); 2440 2441 if (Moving) { 2442 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2443 } 2444 2445 CXXCastPath BasePath; 2446 BasePath.push_back(BaseSpec); 2447 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2448 CK_UncheckedDerivedToBase, 2449 Moving ? VK_XValue : VK_LValue, 2450 &BasePath).take(); 2451 2452 InitializationKind InitKind 2453 = InitializationKind::CreateDirect(Constructor->getLocation(), 2454 SourceLocation(), SourceLocation()); 2455 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2456 &CopyCtorArg, 1); 2457 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2458 MultiExprArg(&CopyCtorArg, 1)); 2459 break; 2460 } 2461 } 2462 2463 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2464 if (BaseInit.isInvalid()) 2465 return true; 2466 2467 CXXBaseInit = 2468 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2469 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2470 SourceLocation()), 2471 BaseSpec->isVirtual(), 2472 SourceLocation(), 2473 BaseInit.takeAs<Expr>(), 2474 SourceLocation(), 2475 SourceLocation()); 2476 2477 return false; 2478} 2479 2480static bool RefersToRValueRef(Expr *MemRef) { 2481 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2482 return Referenced->getType()->isRValueReferenceType(); 2483} 2484 2485static bool 2486BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2487 ImplicitInitializerKind ImplicitInitKind, 2488 FieldDecl *Field, IndirectFieldDecl *Indirect, 2489 CXXCtorInitializer *&CXXMemberInit) { 2490 if (Field->isInvalidDecl()) 2491 return true; 2492 2493 SourceLocation Loc = Constructor->getLocation(); 2494 2495 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2496 bool Moving = ImplicitInitKind == IIK_Move; 2497 ParmVarDecl *Param = Constructor->getParamDecl(0); 2498 QualType ParamType = Param->getType().getNonReferenceType(); 2499 2500 // Suppress copying zero-width bitfields. 2501 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2502 return false; 2503 2504 Expr *MemberExprBase = 2505 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2506 SourceLocation(), Param, false, 2507 Loc, ParamType, VK_LValue, 0); 2508 2509 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2510 2511 if (Moving) { 2512 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2513 } 2514 2515 // Build a reference to this field within the parameter. 2516 CXXScopeSpec SS; 2517 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2518 Sema::LookupMemberName); 2519 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2520 : cast<ValueDecl>(Field), AS_public); 2521 MemberLookup.resolveKind(); 2522 ExprResult CtorArg 2523 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2524 ParamType, Loc, 2525 /*IsArrow=*/false, 2526 SS, 2527 /*TemplateKWLoc=*/SourceLocation(), 2528 /*FirstQualifierInScope=*/0, 2529 MemberLookup, 2530 /*TemplateArgs=*/0); 2531 if (CtorArg.isInvalid()) 2532 return true; 2533 2534 // C++11 [class.copy]p15: 2535 // - if a member m has rvalue reference type T&&, it is direct-initialized 2536 // with static_cast<T&&>(x.m); 2537 if (RefersToRValueRef(CtorArg.get())) { 2538 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2539 } 2540 2541 // When the field we are copying is an array, create index variables for 2542 // each dimension of the array. We use these index variables to subscript 2543 // the source array, and other clients (e.g., CodeGen) will perform the 2544 // necessary iteration with these index variables. 2545 SmallVector<VarDecl *, 4> IndexVariables; 2546 QualType BaseType = Field->getType(); 2547 QualType SizeType = SemaRef.Context.getSizeType(); 2548 bool InitializingArray = false; 2549 while (const ConstantArrayType *Array 2550 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2551 InitializingArray = true; 2552 // Create the iteration variable for this array index. 2553 IdentifierInfo *IterationVarName = 0; 2554 { 2555 SmallString<8> Str; 2556 llvm::raw_svector_ostream OS(Str); 2557 OS << "__i" << IndexVariables.size(); 2558 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2559 } 2560 VarDecl *IterationVar 2561 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2562 IterationVarName, SizeType, 2563 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2564 SC_None, SC_None); 2565 IndexVariables.push_back(IterationVar); 2566 2567 // Create a reference to the iteration variable. 2568 ExprResult IterationVarRef 2569 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2570 assert(!IterationVarRef.isInvalid() && 2571 "Reference to invented variable cannot fail!"); 2572 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2573 assert(!IterationVarRef.isInvalid() && 2574 "Conversion of invented variable cannot fail!"); 2575 2576 // Subscript the array with this iteration variable. 2577 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2578 IterationVarRef.take(), 2579 Loc); 2580 if (CtorArg.isInvalid()) 2581 return true; 2582 2583 BaseType = Array->getElementType(); 2584 } 2585 2586 // The array subscript expression is an lvalue, which is wrong for moving. 2587 if (Moving && InitializingArray) 2588 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2589 2590 // Construct the entity that we will be initializing. For an array, this 2591 // will be first element in the array, which may require several levels 2592 // of array-subscript entities. 2593 SmallVector<InitializedEntity, 4> Entities; 2594 Entities.reserve(1 + IndexVariables.size()); 2595 if (Indirect) 2596 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2597 else 2598 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2599 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2600 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2601 0, 2602 Entities.back())); 2603 2604 // Direct-initialize to use the copy constructor. 2605 InitializationKind InitKind = 2606 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2607 2608 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2609 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2610 &CtorArgE, 1); 2611 2612 ExprResult MemberInit 2613 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2614 MultiExprArg(&CtorArgE, 1)); 2615 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2616 if (MemberInit.isInvalid()) 2617 return true; 2618 2619 if (Indirect) { 2620 assert(IndexVariables.size() == 0 && 2621 "Indirect field improperly initialized"); 2622 CXXMemberInit 2623 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2624 Loc, Loc, 2625 MemberInit.takeAs<Expr>(), 2626 Loc); 2627 } else 2628 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2629 Loc, MemberInit.takeAs<Expr>(), 2630 Loc, 2631 IndexVariables.data(), 2632 IndexVariables.size()); 2633 return false; 2634 } 2635 2636 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2637 2638 QualType FieldBaseElementType = 2639 SemaRef.Context.getBaseElementType(Field->getType()); 2640 2641 if (FieldBaseElementType->isRecordType()) { 2642 InitializedEntity InitEntity 2643 = Indirect? InitializedEntity::InitializeMember(Indirect) 2644 : InitializedEntity::InitializeMember(Field); 2645 InitializationKind InitKind = 2646 InitializationKind::CreateDefault(Loc); 2647 2648 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2649 ExprResult MemberInit = 2650 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2651 2652 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2653 if (MemberInit.isInvalid()) 2654 return true; 2655 2656 if (Indirect) 2657 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2658 Indirect, Loc, 2659 Loc, 2660 MemberInit.get(), 2661 Loc); 2662 else 2663 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2664 Field, Loc, Loc, 2665 MemberInit.get(), 2666 Loc); 2667 return false; 2668 } 2669 2670 if (!Field->getParent()->isUnion()) { 2671 if (FieldBaseElementType->isReferenceType()) { 2672 SemaRef.Diag(Constructor->getLocation(), 2673 diag::err_uninitialized_member_in_ctor) 2674 << (int)Constructor->isImplicit() 2675 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2676 << 0 << Field->getDeclName(); 2677 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2678 return true; 2679 } 2680 2681 if (FieldBaseElementType.isConstQualified()) { 2682 SemaRef.Diag(Constructor->getLocation(), 2683 diag::err_uninitialized_member_in_ctor) 2684 << (int)Constructor->isImplicit() 2685 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2686 << 1 << Field->getDeclName(); 2687 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2688 return true; 2689 } 2690 } 2691 2692 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2693 FieldBaseElementType->isObjCRetainableType() && 2694 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2695 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2696 // Instant objects: 2697 // Default-initialize Objective-C pointers to NULL. 2698 CXXMemberInit 2699 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2700 Loc, Loc, 2701 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2702 Loc); 2703 return false; 2704 } 2705 2706 // Nothing to initialize. 2707 CXXMemberInit = 0; 2708 return false; 2709} 2710 2711namespace { 2712struct BaseAndFieldInfo { 2713 Sema &S; 2714 CXXConstructorDecl *Ctor; 2715 bool AnyErrorsInInits; 2716 ImplicitInitializerKind IIK; 2717 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2718 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2719 2720 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2721 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2722 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2723 if (Generated && Ctor->isCopyConstructor()) 2724 IIK = IIK_Copy; 2725 else if (Generated && Ctor->isMoveConstructor()) 2726 IIK = IIK_Move; 2727 else 2728 IIK = IIK_Default; 2729 } 2730 2731 bool isImplicitCopyOrMove() const { 2732 switch (IIK) { 2733 case IIK_Copy: 2734 case IIK_Move: 2735 return true; 2736 2737 case IIK_Default: 2738 return false; 2739 } 2740 2741 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2742 } 2743}; 2744} 2745 2746/// \brief Determine whether the given indirect field declaration is somewhere 2747/// within an anonymous union. 2748static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2749 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2750 CEnd = F->chain_end(); 2751 C != CEnd; ++C) 2752 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2753 if (Record->isUnion()) 2754 return true; 2755 2756 return false; 2757} 2758 2759/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2760/// array type. 2761static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2762 if (T->isIncompleteArrayType()) 2763 return true; 2764 2765 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2766 if (!ArrayT->getSize()) 2767 return true; 2768 2769 T = ArrayT->getElementType(); 2770 } 2771 2772 return false; 2773} 2774 2775static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2776 FieldDecl *Field, 2777 IndirectFieldDecl *Indirect = 0) { 2778 2779 // Overwhelmingly common case: we have a direct initializer for this field. 2780 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2781 Info.AllToInit.push_back(Init); 2782 return false; 2783 } 2784 2785 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2786 // has a brace-or-equal-initializer, the entity is initialized as specified 2787 // in [dcl.init]. 2788 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2789 CXXCtorInitializer *Init; 2790 if (Indirect) 2791 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2792 SourceLocation(), 2793 SourceLocation(), 0, 2794 SourceLocation()); 2795 else 2796 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2797 SourceLocation(), 2798 SourceLocation(), 0, 2799 SourceLocation()); 2800 Info.AllToInit.push_back(Init); 2801 return false; 2802 } 2803 2804 // Don't build an implicit initializer for union members if none was 2805 // explicitly specified. 2806 if (Field->getParent()->isUnion() || 2807 (Indirect && isWithinAnonymousUnion(Indirect))) 2808 return false; 2809 2810 // Don't initialize incomplete or zero-length arrays. 2811 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2812 return false; 2813 2814 // Don't try to build an implicit initializer if there were semantic 2815 // errors in any of the initializers (and therefore we might be 2816 // missing some that the user actually wrote). 2817 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2818 return false; 2819 2820 CXXCtorInitializer *Init = 0; 2821 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2822 Indirect, Init)) 2823 return true; 2824 2825 if (Init) 2826 Info.AllToInit.push_back(Init); 2827 2828 return false; 2829} 2830 2831bool 2832Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2833 CXXCtorInitializer *Initializer) { 2834 assert(Initializer->isDelegatingInitializer()); 2835 Constructor->setNumCtorInitializers(1); 2836 CXXCtorInitializer **initializer = 2837 new (Context) CXXCtorInitializer*[1]; 2838 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2839 Constructor->setCtorInitializers(initializer); 2840 2841 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2842 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2843 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2844 } 2845 2846 DelegatingCtorDecls.push_back(Constructor); 2847 2848 return false; 2849} 2850 2851bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2852 CXXCtorInitializer **Initializers, 2853 unsigned NumInitializers, 2854 bool AnyErrors) { 2855 if (Constructor->isDependentContext()) { 2856 // Just store the initializers as written, they will be checked during 2857 // instantiation. 2858 if (NumInitializers > 0) { 2859 Constructor->setNumCtorInitializers(NumInitializers); 2860 CXXCtorInitializer **baseOrMemberInitializers = 2861 new (Context) CXXCtorInitializer*[NumInitializers]; 2862 memcpy(baseOrMemberInitializers, Initializers, 2863 NumInitializers * sizeof(CXXCtorInitializer*)); 2864 Constructor->setCtorInitializers(baseOrMemberInitializers); 2865 } 2866 2867 return false; 2868 } 2869 2870 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2871 2872 // We need to build the initializer AST according to order of construction 2873 // and not what user specified in the Initializers list. 2874 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2875 if (!ClassDecl) 2876 return true; 2877 2878 bool HadError = false; 2879 2880 for (unsigned i = 0; i < NumInitializers; i++) { 2881 CXXCtorInitializer *Member = Initializers[i]; 2882 2883 if (Member->isBaseInitializer()) 2884 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2885 else 2886 Info.AllBaseFields[Member->getAnyMember()] = Member; 2887 } 2888 2889 // Keep track of the direct virtual bases. 2890 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2891 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2892 E = ClassDecl->bases_end(); I != E; ++I) { 2893 if (I->isVirtual()) 2894 DirectVBases.insert(I); 2895 } 2896 2897 // Push virtual bases before others. 2898 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2899 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2900 2901 if (CXXCtorInitializer *Value 2902 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2903 Info.AllToInit.push_back(Value); 2904 } else if (!AnyErrors) { 2905 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2906 CXXCtorInitializer *CXXBaseInit; 2907 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2908 VBase, IsInheritedVirtualBase, 2909 CXXBaseInit)) { 2910 HadError = true; 2911 continue; 2912 } 2913 2914 Info.AllToInit.push_back(CXXBaseInit); 2915 } 2916 } 2917 2918 // Non-virtual bases. 2919 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2920 E = ClassDecl->bases_end(); Base != E; ++Base) { 2921 // Virtuals are in the virtual base list and already constructed. 2922 if (Base->isVirtual()) 2923 continue; 2924 2925 if (CXXCtorInitializer *Value 2926 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2927 Info.AllToInit.push_back(Value); 2928 } else if (!AnyErrors) { 2929 CXXCtorInitializer *CXXBaseInit; 2930 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2931 Base, /*IsInheritedVirtualBase=*/false, 2932 CXXBaseInit)) { 2933 HadError = true; 2934 continue; 2935 } 2936 2937 Info.AllToInit.push_back(CXXBaseInit); 2938 } 2939 } 2940 2941 // Fields. 2942 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2943 MemEnd = ClassDecl->decls_end(); 2944 Mem != MemEnd; ++Mem) { 2945 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2946 // C++ [class.bit]p2: 2947 // A declaration for a bit-field that omits the identifier declares an 2948 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2949 // initialized. 2950 if (F->isUnnamedBitfield()) 2951 continue; 2952 2953 // If we're not generating the implicit copy/move constructor, then we'll 2954 // handle anonymous struct/union fields based on their individual 2955 // indirect fields. 2956 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2957 continue; 2958 2959 if (CollectFieldInitializer(*this, Info, F)) 2960 HadError = true; 2961 continue; 2962 } 2963 2964 // Beyond this point, we only consider default initialization. 2965 if (Info.IIK != IIK_Default) 2966 continue; 2967 2968 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2969 if (F->getType()->isIncompleteArrayType()) { 2970 assert(ClassDecl->hasFlexibleArrayMember() && 2971 "Incomplete array type is not valid"); 2972 continue; 2973 } 2974 2975 // Initialize each field of an anonymous struct individually. 2976 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2977 HadError = true; 2978 2979 continue; 2980 } 2981 } 2982 2983 NumInitializers = Info.AllToInit.size(); 2984 if (NumInitializers > 0) { 2985 Constructor->setNumCtorInitializers(NumInitializers); 2986 CXXCtorInitializer **baseOrMemberInitializers = 2987 new (Context) CXXCtorInitializer*[NumInitializers]; 2988 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2989 NumInitializers * sizeof(CXXCtorInitializer*)); 2990 Constructor->setCtorInitializers(baseOrMemberInitializers); 2991 2992 // Constructors implicitly reference the base and member 2993 // destructors. 2994 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2995 Constructor->getParent()); 2996 } 2997 2998 return HadError; 2999} 3000 3001static void *GetKeyForTopLevelField(FieldDecl *Field) { 3002 // For anonymous unions, use the class declaration as the key. 3003 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3004 if (RT->getDecl()->isAnonymousStructOrUnion()) 3005 return static_cast<void *>(RT->getDecl()); 3006 } 3007 return static_cast<void *>(Field); 3008} 3009 3010static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3011 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3012} 3013 3014static void *GetKeyForMember(ASTContext &Context, 3015 CXXCtorInitializer *Member) { 3016 if (!Member->isAnyMemberInitializer()) 3017 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3018 3019 // For fields injected into the class via declaration of an anonymous union, 3020 // use its anonymous union class declaration as the unique key. 3021 FieldDecl *Field = Member->getAnyMember(); 3022 3023 // If the field is a member of an anonymous struct or union, our key 3024 // is the anonymous record decl that's a direct child of the class. 3025 RecordDecl *RD = Field->getParent(); 3026 if (RD->isAnonymousStructOrUnion()) { 3027 while (true) { 3028 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3029 if (Parent->isAnonymousStructOrUnion()) 3030 RD = Parent; 3031 else 3032 break; 3033 } 3034 3035 return static_cast<void *>(RD); 3036 } 3037 3038 return static_cast<void *>(Field); 3039} 3040 3041static void 3042DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3043 const CXXConstructorDecl *Constructor, 3044 CXXCtorInitializer **Inits, 3045 unsigned NumInits) { 3046 if (Constructor->getDeclContext()->isDependentContext()) 3047 return; 3048 3049 // Don't check initializers order unless the warning is enabled at the 3050 // location of at least one initializer. 3051 bool ShouldCheckOrder = false; 3052 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3053 CXXCtorInitializer *Init = Inits[InitIndex]; 3054 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3055 Init->getSourceLocation()) 3056 != DiagnosticsEngine::Ignored) { 3057 ShouldCheckOrder = true; 3058 break; 3059 } 3060 } 3061 if (!ShouldCheckOrder) 3062 return; 3063 3064 // Build the list of bases and members in the order that they'll 3065 // actually be initialized. The explicit initializers should be in 3066 // this same order but may be missing things. 3067 SmallVector<const void*, 32> IdealInitKeys; 3068 3069 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3070 3071 // 1. Virtual bases. 3072 for (CXXRecordDecl::base_class_const_iterator VBase = 3073 ClassDecl->vbases_begin(), 3074 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3075 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3076 3077 // 2. Non-virtual bases. 3078 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3079 E = ClassDecl->bases_end(); Base != E; ++Base) { 3080 if (Base->isVirtual()) 3081 continue; 3082 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3083 } 3084 3085 // 3. Direct fields. 3086 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3087 E = ClassDecl->field_end(); Field != E; ++Field) { 3088 if (Field->isUnnamedBitfield()) 3089 continue; 3090 3091 IdealInitKeys.push_back(GetKeyForTopLevelField(&*Field)); 3092 } 3093 3094 unsigned NumIdealInits = IdealInitKeys.size(); 3095 unsigned IdealIndex = 0; 3096 3097 CXXCtorInitializer *PrevInit = 0; 3098 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3099 CXXCtorInitializer *Init = Inits[InitIndex]; 3100 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3101 3102 // Scan forward to try to find this initializer in the idealized 3103 // initializers list. 3104 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3105 if (InitKey == IdealInitKeys[IdealIndex]) 3106 break; 3107 3108 // If we didn't find this initializer, it must be because we 3109 // scanned past it on a previous iteration. That can only 3110 // happen if we're out of order; emit a warning. 3111 if (IdealIndex == NumIdealInits && PrevInit) { 3112 Sema::SemaDiagnosticBuilder D = 3113 SemaRef.Diag(PrevInit->getSourceLocation(), 3114 diag::warn_initializer_out_of_order); 3115 3116 if (PrevInit->isAnyMemberInitializer()) 3117 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3118 else 3119 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3120 3121 if (Init->isAnyMemberInitializer()) 3122 D << 0 << Init->getAnyMember()->getDeclName(); 3123 else 3124 D << 1 << Init->getTypeSourceInfo()->getType(); 3125 3126 // Move back to the initializer's location in the ideal list. 3127 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3128 if (InitKey == IdealInitKeys[IdealIndex]) 3129 break; 3130 3131 assert(IdealIndex != NumIdealInits && 3132 "initializer not found in initializer list"); 3133 } 3134 3135 PrevInit = Init; 3136 } 3137} 3138 3139namespace { 3140bool CheckRedundantInit(Sema &S, 3141 CXXCtorInitializer *Init, 3142 CXXCtorInitializer *&PrevInit) { 3143 if (!PrevInit) { 3144 PrevInit = Init; 3145 return false; 3146 } 3147 3148 if (FieldDecl *Field = Init->getMember()) 3149 S.Diag(Init->getSourceLocation(), 3150 diag::err_multiple_mem_initialization) 3151 << Field->getDeclName() 3152 << Init->getSourceRange(); 3153 else { 3154 const Type *BaseClass = Init->getBaseClass(); 3155 assert(BaseClass && "neither field nor base"); 3156 S.Diag(Init->getSourceLocation(), 3157 diag::err_multiple_base_initialization) 3158 << QualType(BaseClass, 0) 3159 << Init->getSourceRange(); 3160 } 3161 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3162 << 0 << PrevInit->getSourceRange(); 3163 3164 return true; 3165} 3166 3167typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3168typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3169 3170bool CheckRedundantUnionInit(Sema &S, 3171 CXXCtorInitializer *Init, 3172 RedundantUnionMap &Unions) { 3173 FieldDecl *Field = Init->getAnyMember(); 3174 RecordDecl *Parent = Field->getParent(); 3175 NamedDecl *Child = Field; 3176 3177 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3178 if (Parent->isUnion()) { 3179 UnionEntry &En = Unions[Parent]; 3180 if (En.first && En.first != Child) { 3181 S.Diag(Init->getSourceLocation(), 3182 diag::err_multiple_mem_union_initialization) 3183 << Field->getDeclName() 3184 << Init->getSourceRange(); 3185 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3186 << 0 << En.second->getSourceRange(); 3187 return true; 3188 } 3189 if (!En.first) { 3190 En.first = Child; 3191 En.second = Init; 3192 } 3193 if (!Parent->isAnonymousStructOrUnion()) 3194 return false; 3195 } 3196 3197 Child = Parent; 3198 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3199 } 3200 3201 return false; 3202} 3203} 3204 3205/// ActOnMemInitializers - Handle the member initializers for a constructor. 3206void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3207 SourceLocation ColonLoc, 3208 CXXCtorInitializer **meminits, 3209 unsigned NumMemInits, 3210 bool AnyErrors) { 3211 if (!ConstructorDecl) 3212 return; 3213 3214 AdjustDeclIfTemplate(ConstructorDecl); 3215 3216 CXXConstructorDecl *Constructor 3217 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3218 3219 if (!Constructor) { 3220 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3221 return; 3222 } 3223 3224 CXXCtorInitializer **MemInits = 3225 reinterpret_cast<CXXCtorInitializer **>(meminits); 3226 3227 // Mapping for the duplicate initializers check. 3228 // For member initializers, this is keyed with a FieldDecl*. 3229 // For base initializers, this is keyed with a Type*. 3230 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3231 3232 // Mapping for the inconsistent anonymous-union initializers check. 3233 RedundantUnionMap MemberUnions; 3234 3235 bool HadError = false; 3236 for (unsigned i = 0; i < NumMemInits; i++) { 3237 CXXCtorInitializer *Init = MemInits[i]; 3238 3239 // Set the source order index. 3240 Init->setSourceOrder(i); 3241 3242 if (Init->isAnyMemberInitializer()) { 3243 FieldDecl *Field = Init->getAnyMember(); 3244 if (CheckRedundantInit(*this, Init, Members[Field]) || 3245 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3246 HadError = true; 3247 } else if (Init->isBaseInitializer()) { 3248 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3249 if (CheckRedundantInit(*this, Init, Members[Key])) 3250 HadError = true; 3251 } else { 3252 assert(Init->isDelegatingInitializer()); 3253 // This must be the only initializer 3254 if (i != 0 || NumMemInits > 1) { 3255 Diag(MemInits[0]->getSourceLocation(), 3256 diag::err_delegating_initializer_alone) 3257 << MemInits[0]->getSourceRange(); 3258 HadError = true; 3259 // We will treat this as being the only initializer. 3260 } 3261 SetDelegatingInitializer(Constructor, MemInits[i]); 3262 // Return immediately as the initializer is set. 3263 return; 3264 } 3265 } 3266 3267 if (HadError) 3268 return; 3269 3270 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3271 3272 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3273} 3274 3275void 3276Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3277 CXXRecordDecl *ClassDecl) { 3278 // Ignore dependent contexts. Also ignore unions, since their members never 3279 // have destructors implicitly called. 3280 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3281 return; 3282 3283 // FIXME: all the access-control diagnostics are positioned on the 3284 // field/base declaration. That's probably good; that said, the 3285 // user might reasonably want to know why the destructor is being 3286 // emitted, and we currently don't say. 3287 3288 // Non-static data members. 3289 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3290 E = ClassDecl->field_end(); I != E; ++I) { 3291 FieldDecl *Field = &*I; 3292 if (Field->isInvalidDecl()) 3293 continue; 3294 3295 // Don't destroy incomplete or zero-length arrays. 3296 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3297 continue; 3298 3299 QualType FieldType = Context.getBaseElementType(Field->getType()); 3300 3301 const RecordType* RT = FieldType->getAs<RecordType>(); 3302 if (!RT) 3303 continue; 3304 3305 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3306 if (FieldClassDecl->isInvalidDecl()) 3307 continue; 3308 if (FieldClassDecl->hasIrrelevantDestructor()) 3309 continue; 3310 // The destructor for an implicit anonymous union member is never invoked. 3311 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3312 continue; 3313 3314 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3315 assert(Dtor && "No dtor found for FieldClassDecl!"); 3316 CheckDestructorAccess(Field->getLocation(), Dtor, 3317 PDiag(diag::err_access_dtor_field) 3318 << Field->getDeclName() 3319 << FieldType); 3320 3321 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3322 DiagnoseUseOfDecl(Dtor, Location); 3323 } 3324 3325 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3326 3327 // Bases. 3328 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3329 E = ClassDecl->bases_end(); Base != E; ++Base) { 3330 // Bases are always records in a well-formed non-dependent class. 3331 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3332 3333 // Remember direct virtual bases. 3334 if (Base->isVirtual()) 3335 DirectVirtualBases.insert(RT); 3336 3337 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3338 // If our base class is invalid, we probably can't get its dtor anyway. 3339 if (BaseClassDecl->isInvalidDecl()) 3340 continue; 3341 if (BaseClassDecl->hasIrrelevantDestructor()) 3342 continue; 3343 3344 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3345 assert(Dtor && "No dtor found for BaseClassDecl!"); 3346 3347 // FIXME: caret should be on the start of the class name 3348 CheckDestructorAccess(Base->getLocStart(), Dtor, 3349 PDiag(diag::err_access_dtor_base) 3350 << Base->getType() 3351 << Base->getSourceRange(), 3352 Context.getTypeDeclType(ClassDecl)); 3353 3354 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3355 DiagnoseUseOfDecl(Dtor, Location); 3356 } 3357 3358 // Virtual bases. 3359 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3360 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3361 3362 // Bases are always records in a well-formed non-dependent class. 3363 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3364 3365 // Ignore direct virtual bases. 3366 if (DirectVirtualBases.count(RT)) 3367 continue; 3368 3369 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3370 // If our base class is invalid, we probably can't get its dtor anyway. 3371 if (BaseClassDecl->isInvalidDecl()) 3372 continue; 3373 if (BaseClassDecl->hasIrrelevantDestructor()) 3374 continue; 3375 3376 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3377 assert(Dtor && "No dtor found for BaseClassDecl!"); 3378 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3379 PDiag(diag::err_access_dtor_vbase) 3380 << VBase->getType(), 3381 Context.getTypeDeclType(ClassDecl)); 3382 3383 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3384 DiagnoseUseOfDecl(Dtor, Location); 3385 } 3386} 3387 3388void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3389 if (!CDtorDecl) 3390 return; 3391 3392 if (CXXConstructorDecl *Constructor 3393 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3394 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3395} 3396 3397bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3398 unsigned DiagID, AbstractDiagSelID SelID) { 3399 if (SelID == -1) 3400 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3401 else 3402 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3403} 3404 3405bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3406 const PartialDiagnostic &PD) { 3407 if (!getLangOpts().CPlusPlus) 3408 return false; 3409 3410 if (const ArrayType *AT = Context.getAsArrayType(T)) 3411 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3412 3413 if (const PointerType *PT = T->getAs<PointerType>()) { 3414 // Find the innermost pointer type. 3415 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3416 PT = T; 3417 3418 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3419 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3420 } 3421 3422 const RecordType *RT = T->getAs<RecordType>(); 3423 if (!RT) 3424 return false; 3425 3426 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3427 3428 // We can't answer whether something is abstract until it has a 3429 // definition. If it's currently being defined, we'll walk back 3430 // over all the declarations when we have a full definition. 3431 const CXXRecordDecl *Def = RD->getDefinition(); 3432 if (!Def || Def->isBeingDefined()) 3433 return false; 3434 3435 if (!RD->isAbstract()) 3436 return false; 3437 3438 Diag(Loc, PD) << RD->getDeclName(); 3439 DiagnoseAbstractType(RD); 3440 3441 return true; 3442} 3443 3444void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3445 // Check if we've already emitted the list of pure virtual functions 3446 // for this class. 3447 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3448 return; 3449 3450 CXXFinalOverriderMap FinalOverriders; 3451 RD->getFinalOverriders(FinalOverriders); 3452 3453 // Keep a set of seen pure methods so we won't diagnose the same method 3454 // more than once. 3455 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3456 3457 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3458 MEnd = FinalOverriders.end(); 3459 M != MEnd; 3460 ++M) { 3461 for (OverridingMethods::iterator SO = M->second.begin(), 3462 SOEnd = M->second.end(); 3463 SO != SOEnd; ++SO) { 3464 // C++ [class.abstract]p4: 3465 // A class is abstract if it contains or inherits at least one 3466 // pure virtual function for which the final overrider is pure 3467 // virtual. 3468 3469 // 3470 if (SO->second.size() != 1) 3471 continue; 3472 3473 if (!SO->second.front().Method->isPure()) 3474 continue; 3475 3476 if (!SeenPureMethods.insert(SO->second.front().Method)) 3477 continue; 3478 3479 Diag(SO->second.front().Method->getLocation(), 3480 diag::note_pure_virtual_function) 3481 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3482 } 3483 } 3484 3485 if (!PureVirtualClassDiagSet) 3486 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3487 PureVirtualClassDiagSet->insert(RD); 3488} 3489 3490namespace { 3491struct AbstractUsageInfo { 3492 Sema &S; 3493 CXXRecordDecl *Record; 3494 CanQualType AbstractType; 3495 bool Invalid; 3496 3497 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3498 : S(S), Record(Record), 3499 AbstractType(S.Context.getCanonicalType( 3500 S.Context.getTypeDeclType(Record))), 3501 Invalid(false) {} 3502 3503 void DiagnoseAbstractType() { 3504 if (Invalid) return; 3505 S.DiagnoseAbstractType(Record); 3506 Invalid = true; 3507 } 3508 3509 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3510}; 3511 3512struct CheckAbstractUsage { 3513 AbstractUsageInfo &Info; 3514 const NamedDecl *Ctx; 3515 3516 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3517 : Info(Info), Ctx(Ctx) {} 3518 3519 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3520 switch (TL.getTypeLocClass()) { 3521#define ABSTRACT_TYPELOC(CLASS, PARENT) 3522#define TYPELOC(CLASS, PARENT) \ 3523 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3524#include "clang/AST/TypeLocNodes.def" 3525 } 3526 } 3527 3528 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3529 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3530 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3531 if (!TL.getArg(I)) 3532 continue; 3533 3534 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3535 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3536 } 3537 } 3538 3539 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3540 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3541 } 3542 3543 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3544 // Visit the type parameters from a permissive context. 3545 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3546 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3547 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3548 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3549 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3550 // TODO: other template argument types? 3551 } 3552 } 3553 3554 // Visit pointee types from a permissive context. 3555#define CheckPolymorphic(Type) \ 3556 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3557 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3558 } 3559 CheckPolymorphic(PointerTypeLoc) 3560 CheckPolymorphic(ReferenceTypeLoc) 3561 CheckPolymorphic(MemberPointerTypeLoc) 3562 CheckPolymorphic(BlockPointerTypeLoc) 3563 CheckPolymorphic(AtomicTypeLoc) 3564 3565 /// Handle all the types we haven't given a more specific 3566 /// implementation for above. 3567 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3568 // Every other kind of type that we haven't called out already 3569 // that has an inner type is either (1) sugar or (2) contains that 3570 // inner type in some way as a subobject. 3571 if (TypeLoc Next = TL.getNextTypeLoc()) 3572 return Visit(Next, Sel); 3573 3574 // If there's no inner type and we're in a permissive context, 3575 // don't diagnose. 3576 if (Sel == Sema::AbstractNone) return; 3577 3578 // Check whether the type matches the abstract type. 3579 QualType T = TL.getType(); 3580 if (T->isArrayType()) { 3581 Sel = Sema::AbstractArrayType; 3582 T = Info.S.Context.getBaseElementType(T); 3583 } 3584 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3585 if (CT != Info.AbstractType) return; 3586 3587 // It matched; do some magic. 3588 if (Sel == Sema::AbstractArrayType) { 3589 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3590 << T << TL.getSourceRange(); 3591 } else { 3592 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3593 << Sel << T << TL.getSourceRange(); 3594 } 3595 Info.DiagnoseAbstractType(); 3596 } 3597}; 3598 3599void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3600 Sema::AbstractDiagSelID Sel) { 3601 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3602} 3603 3604} 3605 3606/// Check for invalid uses of an abstract type in a method declaration. 3607static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3608 CXXMethodDecl *MD) { 3609 // No need to do the check on definitions, which require that 3610 // the return/param types be complete. 3611 if (MD->doesThisDeclarationHaveABody()) 3612 return; 3613 3614 // For safety's sake, just ignore it if we don't have type source 3615 // information. This should never happen for non-implicit methods, 3616 // but... 3617 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3618 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3619} 3620 3621/// Check for invalid uses of an abstract type within a class definition. 3622static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3623 CXXRecordDecl *RD) { 3624 for (CXXRecordDecl::decl_iterator 3625 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3626 Decl *D = *I; 3627 if (D->isImplicit()) continue; 3628 3629 // Methods and method templates. 3630 if (isa<CXXMethodDecl>(D)) { 3631 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3632 } else if (isa<FunctionTemplateDecl>(D)) { 3633 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3634 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3635 3636 // Fields and static variables. 3637 } else if (isa<FieldDecl>(D)) { 3638 FieldDecl *FD = cast<FieldDecl>(D); 3639 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3640 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3641 } else if (isa<VarDecl>(D)) { 3642 VarDecl *VD = cast<VarDecl>(D); 3643 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3644 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3645 3646 // Nested classes and class templates. 3647 } else if (isa<CXXRecordDecl>(D)) { 3648 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3649 } else if (isa<ClassTemplateDecl>(D)) { 3650 CheckAbstractClassUsage(Info, 3651 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3652 } 3653 } 3654} 3655 3656/// \brief Perform semantic checks on a class definition that has been 3657/// completing, introducing implicitly-declared members, checking for 3658/// abstract types, etc. 3659void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3660 if (!Record) 3661 return; 3662 3663 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3664 AbstractUsageInfo Info(*this, Record); 3665 CheckAbstractClassUsage(Info, Record); 3666 } 3667 3668 // If this is not an aggregate type and has no user-declared constructor, 3669 // complain about any non-static data members of reference or const scalar 3670 // type, since they will never get initializers. 3671 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3672 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3673 !Record->isLambda()) { 3674 bool Complained = false; 3675 for (RecordDecl::field_iterator F = Record->field_begin(), 3676 FEnd = Record->field_end(); 3677 F != FEnd; ++F) { 3678 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3679 continue; 3680 3681 if (F->getType()->isReferenceType() || 3682 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3683 if (!Complained) { 3684 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3685 << Record->getTagKind() << Record; 3686 Complained = true; 3687 } 3688 3689 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3690 << F->getType()->isReferenceType() 3691 << F->getDeclName(); 3692 } 3693 } 3694 } 3695 3696 if (Record->isDynamicClass() && !Record->isDependentType()) 3697 DynamicClasses.push_back(Record); 3698 3699 if (Record->getIdentifier()) { 3700 // C++ [class.mem]p13: 3701 // If T is the name of a class, then each of the following shall have a 3702 // name different from T: 3703 // - every member of every anonymous union that is a member of class T. 3704 // 3705 // C++ [class.mem]p14: 3706 // In addition, if class T has a user-declared constructor (12.1), every 3707 // non-static data member of class T shall have a name different from T. 3708 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3709 R.first != R.second; ++R.first) { 3710 NamedDecl *D = *R.first; 3711 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3712 isa<IndirectFieldDecl>(D)) { 3713 Diag(D->getLocation(), diag::err_member_name_of_class) 3714 << D->getDeclName(); 3715 break; 3716 } 3717 } 3718 } 3719 3720 // Warn if the class has virtual methods but non-virtual public destructor. 3721 if (Record->isPolymorphic() && !Record->isDependentType()) { 3722 CXXDestructorDecl *dtor = Record->getDestructor(); 3723 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3724 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3725 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3726 } 3727 3728 // See if a method overloads virtual methods in a base 3729 /// class without overriding any. 3730 if (!Record->isDependentType()) { 3731 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3732 MEnd = Record->method_end(); 3733 M != MEnd; ++M) { 3734 if (!M->isStatic()) 3735 DiagnoseHiddenVirtualMethods(Record, &*M); 3736 } 3737 } 3738 3739 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3740 // function that is not a constructor declares that member function to be 3741 // const. [...] The class of which that function is a member shall be 3742 // a literal type. 3743 // 3744 // If the class has virtual bases, any constexpr members will already have 3745 // been diagnosed by the checks performed on the member declaration, so 3746 // suppress this (less useful) diagnostic. 3747 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3748 !Record->isLiteral() && !Record->getNumVBases()) { 3749 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3750 MEnd = Record->method_end(); 3751 M != MEnd; ++M) { 3752 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3753 switch (Record->getTemplateSpecializationKind()) { 3754 case TSK_ImplicitInstantiation: 3755 case TSK_ExplicitInstantiationDeclaration: 3756 case TSK_ExplicitInstantiationDefinition: 3757 // If a template instantiates to a non-literal type, but its members 3758 // instantiate to constexpr functions, the template is technically 3759 // ill-formed, but we allow it for sanity. 3760 continue; 3761 3762 case TSK_Undeclared: 3763 case TSK_ExplicitSpecialization: 3764 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 3765 diag::err_constexpr_method_non_literal); 3766 break; 3767 } 3768 3769 // Only produce one error per class. 3770 break; 3771 } 3772 } 3773 } 3774 3775 // Declare inherited constructors. We do this eagerly here because: 3776 // - The standard requires an eager diagnostic for conflicting inherited 3777 // constructors from different classes. 3778 // - The lazy declaration of the other implicit constructors is so as to not 3779 // waste space and performance on classes that are not meant to be 3780 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3781 // have inherited constructors. 3782 DeclareInheritedConstructors(Record); 3783 3784 if (!Record->isDependentType()) 3785 CheckExplicitlyDefaultedMethods(Record); 3786} 3787 3788void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3789 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3790 ME = Record->method_end(); 3791 MI != ME; ++MI) { 3792 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3793 switch (getSpecialMember(&*MI)) { 3794 case CXXDefaultConstructor: 3795 CheckExplicitlyDefaultedDefaultConstructor( 3796 cast<CXXConstructorDecl>(&*MI)); 3797 break; 3798 3799 case CXXDestructor: 3800 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(&*MI)); 3801 break; 3802 3803 case CXXCopyConstructor: 3804 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(&*MI)); 3805 break; 3806 3807 case CXXCopyAssignment: 3808 CheckExplicitlyDefaultedCopyAssignment(&*MI); 3809 break; 3810 3811 case CXXMoveConstructor: 3812 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(&*MI)); 3813 break; 3814 3815 case CXXMoveAssignment: 3816 CheckExplicitlyDefaultedMoveAssignment(&*MI); 3817 break; 3818 3819 case CXXInvalid: 3820 llvm_unreachable("non-special member explicitly defaulted!"); 3821 } 3822 } 3823 } 3824 3825} 3826 3827void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3828 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3829 3830 // Whether this was the first-declared instance of the constructor. 3831 // This affects whether we implicitly add an exception spec (and, eventually, 3832 // constexpr). It is also ill-formed to explicitly default a constructor such 3833 // that it would be deleted. (C++0x [decl.fct.def.default]) 3834 bool First = CD == CD->getCanonicalDecl(); 3835 3836 bool HadError = false; 3837 if (CD->getNumParams() != 0) { 3838 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3839 << CD->getSourceRange(); 3840 HadError = true; 3841 } 3842 3843 ImplicitExceptionSpecification Spec 3844 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3845 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3846 if (EPI.ExceptionSpecType == EST_Delayed) { 3847 // Exception specification depends on some deferred part of the class. We'll 3848 // try again when the class's definition has been fully processed. 3849 return; 3850 } 3851 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3852 *ExceptionType = Context.getFunctionType( 3853 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3854 3855 // C++11 [dcl.fct.def.default]p2: 3856 // An explicitly-defaulted function may be declared constexpr only if it 3857 // would have been implicitly declared as constexpr, 3858 // Do not apply this rule to templates, since core issue 1358 makes such 3859 // functions always instantiate to constexpr functions. 3860 if (CD->isConstexpr() && 3861 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3862 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3863 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3864 << CXXDefaultConstructor; 3865 HadError = true; 3866 } 3867 } 3868 // and may have an explicit exception-specification only if it is compatible 3869 // with the exception-specification on the implicit declaration. 3870 if (CtorType->hasExceptionSpec()) { 3871 if (CheckEquivalentExceptionSpec( 3872 PDiag(diag::err_incorrect_defaulted_exception_spec) 3873 << CXXDefaultConstructor, 3874 PDiag(), 3875 ExceptionType, SourceLocation(), 3876 CtorType, CD->getLocation())) { 3877 HadError = true; 3878 } 3879 } 3880 3881 // If a function is explicitly defaulted on its first declaration, 3882 if (First) { 3883 // -- it is implicitly considered to be constexpr if the implicit 3884 // definition would be, 3885 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3886 3887 // -- it is implicitly considered to have the same 3888 // exception-specification as if it had been implicitly declared 3889 // 3890 // FIXME: a compatible, but different, explicit exception specification 3891 // will be silently overridden. We should issue a warning if this happens. 3892 EPI.ExtInfo = CtorType->getExtInfo(); 3893 3894 // Such a function is also trivial if the implicitly-declared function 3895 // would have been. 3896 CD->setTrivial(CD->getParent()->hasTrivialDefaultConstructor()); 3897 } 3898 3899 if (HadError) { 3900 CD->setInvalidDecl(); 3901 return; 3902 } 3903 3904 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3905 if (First) { 3906 CD->setDeletedAsWritten(); 3907 } else { 3908 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3909 << CXXDefaultConstructor; 3910 CD->setInvalidDecl(); 3911 } 3912 } 3913} 3914 3915void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3916 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3917 3918 // Whether this was the first-declared instance of the constructor. 3919 bool First = CD == CD->getCanonicalDecl(); 3920 3921 bool HadError = false; 3922 if (CD->getNumParams() != 1) { 3923 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3924 << CD->getSourceRange(); 3925 HadError = true; 3926 } 3927 3928 ImplicitExceptionSpecification Spec(*this); 3929 bool Const; 3930 llvm::tie(Spec, Const) = 3931 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3932 3933 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3934 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3935 *ExceptionType = Context.getFunctionType( 3936 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3937 3938 // Check for parameter type matching. 3939 // This is a copy ctor so we know it's a cv-qualified reference to T. 3940 QualType ArgType = CtorType->getArgType(0); 3941 if (ArgType->getPointeeType().isVolatileQualified()) { 3942 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3943 HadError = true; 3944 } 3945 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3946 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3947 HadError = true; 3948 } 3949 3950 // C++11 [dcl.fct.def.default]p2: 3951 // An explicitly-defaulted function may be declared constexpr only if it 3952 // would have been implicitly declared as constexpr, 3953 // Do not apply this rule to templates, since core issue 1358 makes such 3954 // functions always instantiate to constexpr functions. 3955 if (CD->isConstexpr() && 3956 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3957 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3958 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3959 << CXXCopyConstructor; 3960 HadError = true; 3961 } 3962 } 3963 // and may have an explicit exception-specification only if it is compatible 3964 // with the exception-specification on the implicit declaration. 3965 if (CtorType->hasExceptionSpec()) { 3966 if (CheckEquivalentExceptionSpec( 3967 PDiag(diag::err_incorrect_defaulted_exception_spec) 3968 << CXXCopyConstructor, 3969 PDiag(), 3970 ExceptionType, SourceLocation(), 3971 CtorType, CD->getLocation())) { 3972 HadError = true; 3973 } 3974 } 3975 3976 // If a function is explicitly defaulted on its first declaration, 3977 if (First) { 3978 // -- it is implicitly considered to be constexpr if the implicit 3979 // definition would be, 3980 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3981 3982 // -- it is implicitly considered to have the same 3983 // exception-specification as if it had been implicitly declared, and 3984 // 3985 // FIXME: a compatible, but different, explicit exception specification 3986 // will be silently overridden. We should issue a warning if this happens. 3987 EPI.ExtInfo = CtorType->getExtInfo(); 3988 3989 // -- [...] it shall have the same parameter type as if it had been 3990 // implicitly declared. 3991 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3992 3993 // Such a function is also trivial if the implicitly-declared function 3994 // would have been. 3995 CD->setTrivial(CD->getParent()->hasTrivialCopyConstructor()); 3996 } 3997 3998 if (HadError) { 3999 CD->setInvalidDecl(); 4000 return; 4001 } 4002 4003 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 4004 if (First) { 4005 CD->setDeletedAsWritten(); 4006 } else { 4007 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4008 << CXXCopyConstructor; 4009 CD->setInvalidDecl(); 4010 } 4011 } 4012} 4013 4014void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 4015 assert(MD->isExplicitlyDefaulted()); 4016 4017 // Whether this was the first-declared instance of the operator 4018 bool First = MD == MD->getCanonicalDecl(); 4019 4020 bool HadError = false; 4021 if (MD->getNumParams() != 1) { 4022 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 4023 << MD->getSourceRange(); 4024 HadError = true; 4025 } 4026 4027 QualType ReturnType = 4028 MD->getType()->getAs<FunctionType>()->getResultType(); 4029 if (!ReturnType->isLValueReferenceType() || 4030 !Context.hasSameType( 4031 Context.getCanonicalType(ReturnType->getPointeeType()), 4032 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4033 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 4034 HadError = true; 4035 } 4036 4037 ImplicitExceptionSpecification Spec(*this); 4038 bool Const; 4039 llvm::tie(Spec, Const) = 4040 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 4041 4042 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4043 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4044 *ExceptionType = Context.getFunctionType( 4045 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4046 4047 QualType ArgType = OperType->getArgType(0); 4048 if (!ArgType->isLValueReferenceType()) { 4049 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4050 HadError = true; 4051 } else { 4052 if (ArgType->getPointeeType().isVolatileQualified()) { 4053 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 4054 HadError = true; 4055 } 4056 if (ArgType->getPointeeType().isConstQualified() && !Const) { 4057 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 4058 HadError = true; 4059 } 4060 } 4061 4062 if (OperType->getTypeQuals()) { 4063 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 4064 HadError = true; 4065 } 4066 4067 if (OperType->hasExceptionSpec()) { 4068 if (CheckEquivalentExceptionSpec( 4069 PDiag(diag::err_incorrect_defaulted_exception_spec) 4070 << CXXCopyAssignment, 4071 PDiag(), 4072 ExceptionType, SourceLocation(), 4073 OperType, MD->getLocation())) { 4074 HadError = true; 4075 } 4076 } 4077 if (First) { 4078 // We set the declaration to have the computed exception spec here. 4079 // We duplicate the one parameter type. 4080 EPI.RefQualifier = OperType->getRefQualifier(); 4081 EPI.ExtInfo = OperType->getExtInfo(); 4082 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4083 4084 // Such a function is also trivial if the implicitly-declared function 4085 // would have been. 4086 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 4087 } 4088 4089 if (HadError) { 4090 MD->setInvalidDecl(); 4091 return; 4092 } 4093 4094 if (ShouldDeleteSpecialMember(MD, CXXCopyAssignment)) { 4095 if (First) { 4096 MD->setDeletedAsWritten(); 4097 } else { 4098 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4099 << CXXCopyAssignment; 4100 MD->setInvalidDecl(); 4101 } 4102 } 4103} 4104 4105void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 4106 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 4107 4108 // Whether this was the first-declared instance of the constructor. 4109 bool First = CD == CD->getCanonicalDecl(); 4110 4111 bool HadError = false; 4112 if (CD->getNumParams() != 1) { 4113 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4114 << CD->getSourceRange(); 4115 HadError = true; 4116 } 4117 4118 ImplicitExceptionSpecification Spec( 4119 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4120 4121 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4122 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4123 *ExceptionType = Context.getFunctionType( 4124 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4125 4126 // Check for parameter type matching. 4127 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4128 QualType ArgType = CtorType->getArgType(0); 4129 if (ArgType->getPointeeType().isVolatileQualified()) { 4130 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4131 HadError = true; 4132 } 4133 if (ArgType->getPointeeType().isConstQualified()) { 4134 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4135 HadError = true; 4136 } 4137 4138 // C++11 [dcl.fct.def.default]p2: 4139 // An explicitly-defaulted function may be declared constexpr only if it 4140 // would have been implicitly declared as constexpr, 4141 // Do not apply this rule to templates, since core issue 1358 makes such 4142 // functions always instantiate to constexpr functions. 4143 if (CD->isConstexpr() && 4144 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4145 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4146 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4147 << CXXMoveConstructor; 4148 HadError = true; 4149 } 4150 } 4151 // and may have an explicit exception-specification only if it is compatible 4152 // with the exception-specification on the implicit declaration. 4153 if (CtorType->hasExceptionSpec()) { 4154 if (CheckEquivalentExceptionSpec( 4155 PDiag(diag::err_incorrect_defaulted_exception_spec) 4156 << CXXMoveConstructor, 4157 PDiag(), 4158 ExceptionType, SourceLocation(), 4159 CtorType, CD->getLocation())) { 4160 HadError = true; 4161 } 4162 } 4163 4164 // If a function is explicitly defaulted on its first declaration, 4165 if (First) { 4166 // -- it is implicitly considered to be constexpr if the implicit 4167 // definition would be, 4168 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4169 4170 // -- it is implicitly considered to have the same 4171 // exception-specification as if it had been implicitly declared, and 4172 // 4173 // FIXME: a compatible, but different, explicit exception specification 4174 // will be silently overridden. We should issue a warning if this happens. 4175 EPI.ExtInfo = CtorType->getExtInfo(); 4176 4177 // -- [...] it shall have the same parameter type as if it had been 4178 // implicitly declared. 4179 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4180 4181 // Such a function is also trivial if the implicitly-declared function 4182 // would have been. 4183 CD->setTrivial(CD->getParent()->hasTrivialMoveConstructor()); 4184 } 4185 4186 if (HadError) { 4187 CD->setInvalidDecl(); 4188 return; 4189 } 4190 4191 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4192 if (First) { 4193 CD->setDeletedAsWritten(); 4194 } else { 4195 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4196 << CXXMoveConstructor; 4197 CD->setInvalidDecl(); 4198 } 4199 } 4200} 4201 4202void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4203 assert(MD->isExplicitlyDefaulted()); 4204 4205 // Whether this was the first-declared instance of the operator 4206 bool First = MD == MD->getCanonicalDecl(); 4207 4208 bool HadError = false; 4209 if (MD->getNumParams() != 1) { 4210 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4211 << MD->getSourceRange(); 4212 HadError = true; 4213 } 4214 4215 QualType ReturnType = 4216 MD->getType()->getAs<FunctionType>()->getResultType(); 4217 if (!ReturnType->isLValueReferenceType() || 4218 !Context.hasSameType( 4219 Context.getCanonicalType(ReturnType->getPointeeType()), 4220 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4221 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4222 HadError = true; 4223 } 4224 4225 ImplicitExceptionSpecification Spec( 4226 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4227 4228 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4229 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4230 *ExceptionType = Context.getFunctionType( 4231 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4232 4233 QualType ArgType = OperType->getArgType(0); 4234 if (!ArgType->isRValueReferenceType()) { 4235 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4236 HadError = true; 4237 } else { 4238 if (ArgType->getPointeeType().isVolatileQualified()) { 4239 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4240 HadError = true; 4241 } 4242 if (ArgType->getPointeeType().isConstQualified()) { 4243 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4244 HadError = true; 4245 } 4246 } 4247 4248 if (OperType->getTypeQuals()) { 4249 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4250 HadError = true; 4251 } 4252 4253 if (OperType->hasExceptionSpec()) { 4254 if (CheckEquivalentExceptionSpec( 4255 PDiag(diag::err_incorrect_defaulted_exception_spec) 4256 << CXXMoveAssignment, 4257 PDiag(), 4258 ExceptionType, SourceLocation(), 4259 OperType, MD->getLocation())) { 4260 HadError = true; 4261 } 4262 } 4263 if (First) { 4264 // We set the declaration to have the computed exception spec here. 4265 // We duplicate the one parameter type. 4266 EPI.RefQualifier = OperType->getRefQualifier(); 4267 EPI.ExtInfo = OperType->getExtInfo(); 4268 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4269 4270 // Such a function is also trivial if the implicitly-declared function 4271 // would have been. 4272 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 4273 } 4274 4275 if (HadError) { 4276 MD->setInvalidDecl(); 4277 return; 4278 } 4279 4280 if (ShouldDeleteSpecialMember(MD, CXXMoveAssignment)) { 4281 if (First) { 4282 MD->setDeletedAsWritten(); 4283 } else { 4284 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4285 << CXXMoveAssignment; 4286 MD->setInvalidDecl(); 4287 } 4288 } 4289} 4290 4291void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4292 assert(DD->isExplicitlyDefaulted()); 4293 4294 // Whether this was the first-declared instance of the destructor. 4295 bool First = DD == DD->getCanonicalDecl(); 4296 4297 ImplicitExceptionSpecification Spec 4298 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4299 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4300 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4301 *ExceptionType = Context.getFunctionType( 4302 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4303 4304 if (DtorType->hasExceptionSpec()) { 4305 if (CheckEquivalentExceptionSpec( 4306 PDiag(diag::err_incorrect_defaulted_exception_spec) 4307 << CXXDestructor, 4308 PDiag(), 4309 ExceptionType, SourceLocation(), 4310 DtorType, DD->getLocation())) { 4311 DD->setInvalidDecl(); 4312 return; 4313 } 4314 } 4315 if (First) { 4316 // We set the declaration to have the computed exception spec here. 4317 // There are no parameters. 4318 EPI.ExtInfo = DtorType->getExtInfo(); 4319 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4320 4321 // Such a function is also trivial if the implicitly-declared function 4322 // would have been. 4323 DD->setTrivial(DD->getParent()->hasTrivialDestructor()); 4324 } 4325 4326 if (ShouldDeleteSpecialMember(DD, CXXDestructor)) { 4327 if (First) { 4328 DD->setDeletedAsWritten(); 4329 } else { 4330 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4331 << CXXDestructor; 4332 DD->setInvalidDecl(); 4333 } 4334 } 4335} 4336 4337namespace { 4338struct SpecialMemberDeletionInfo { 4339 Sema &S; 4340 CXXMethodDecl *MD; 4341 Sema::CXXSpecialMember CSM; 4342 bool Diagnose; 4343 4344 // Properties of the special member, computed for convenience. 4345 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4346 SourceLocation Loc; 4347 4348 bool AllFieldsAreConst; 4349 4350 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4351 Sema::CXXSpecialMember CSM, bool Diagnose) 4352 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4353 IsConstructor(false), IsAssignment(false), IsMove(false), 4354 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4355 AllFieldsAreConst(true) { 4356 switch (CSM) { 4357 case Sema::CXXDefaultConstructor: 4358 case Sema::CXXCopyConstructor: 4359 IsConstructor = true; 4360 break; 4361 case Sema::CXXMoveConstructor: 4362 IsConstructor = true; 4363 IsMove = true; 4364 break; 4365 case Sema::CXXCopyAssignment: 4366 IsAssignment = true; 4367 break; 4368 case Sema::CXXMoveAssignment: 4369 IsAssignment = true; 4370 IsMove = true; 4371 break; 4372 case Sema::CXXDestructor: 4373 break; 4374 case Sema::CXXInvalid: 4375 llvm_unreachable("invalid special member kind"); 4376 } 4377 4378 if (MD->getNumParams()) { 4379 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4380 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4381 } 4382 } 4383 4384 bool inUnion() const { return MD->getParent()->isUnion(); } 4385 4386 /// Look up the corresponding special member in the given class. 4387 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class) { 4388 unsigned TQ = MD->getTypeQualifiers(); 4389 return S.LookupSpecialMember(Class, CSM, ConstArg, VolatileArg, 4390 MD->getRefQualifier() == RQ_RValue, 4391 TQ & Qualifiers::Const, 4392 TQ & Qualifiers::Volatile); 4393 } 4394 4395 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4396 4397 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4398 bool shouldDeleteForField(FieldDecl *FD); 4399 bool shouldDeleteForAllConstMembers(); 4400 4401 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj); 4402 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4403 Sema::SpecialMemberOverloadResult *SMOR, 4404 bool IsDtorCallInCtor); 4405 4406 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4407}; 4408} 4409 4410/// Is the given special member inaccessible when used on the given 4411/// sub-object. 4412bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4413 CXXMethodDecl *target) { 4414 /// If we're operating on a base class, the object type is the 4415 /// type of this special member. 4416 QualType objectTy; 4417 AccessSpecifier access = target->getAccess();; 4418 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4419 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4420 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4421 4422 // If we're operating on a field, the object type is the type of the field. 4423 } else { 4424 objectTy = S.Context.getTypeDeclType(target->getParent()); 4425 } 4426 4427 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4428} 4429 4430/// Check whether we should delete a special member due to the implicit 4431/// definition containing a call to a special member of a subobject. 4432bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4433 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4434 bool IsDtorCallInCtor) { 4435 CXXMethodDecl *Decl = SMOR->getMethod(); 4436 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4437 4438 int DiagKind = -1; 4439 4440 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4441 DiagKind = !Decl ? 0 : 1; 4442 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4443 DiagKind = 2; 4444 else if (!isAccessible(Subobj, Decl)) 4445 DiagKind = 3; 4446 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4447 !Decl->isTrivial()) { 4448 // A member of a union must have a trivial corresponding special member. 4449 // As a weird special case, a destructor call from a union's constructor 4450 // must be accessible and non-deleted, but need not be trivial. Such a 4451 // destructor is never actually called, but is semantically checked as 4452 // if it were. 4453 DiagKind = 4; 4454 } 4455 4456 if (DiagKind == -1) 4457 return false; 4458 4459 if (Diagnose) { 4460 if (Field) { 4461 S.Diag(Field->getLocation(), 4462 diag::note_deleted_special_member_class_subobject) 4463 << CSM << MD->getParent() << /*IsField*/true 4464 << Field << DiagKind << IsDtorCallInCtor; 4465 } else { 4466 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4467 S.Diag(Base->getLocStart(), 4468 diag::note_deleted_special_member_class_subobject) 4469 << CSM << MD->getParent() << /*IsField*/false 4470 << Base->getType() << DiagKind << IsDtorCallInCtor; 4471 } 4472 4473 if (DiagKind == 1) 4474 S.NoteDeletedFunction(Decl); 4475 // FIXME: Explain inaccessibility if DiagKind == 3. 4476 } 4477 4478 return true; 4479} 4480 4481/// Check whether we should delete a special member function due to having a 4482/// direct or virtual base class or static data member of class type M. 4483bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4484 CXXRecordDecl *Class, Subobject Subobj) { 4485 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4486 4487 // C++11 [class.ctor]p5: 4488 // -- any direct or virtual base class, or non-static data member with no 4489 // brace-or-equal-initializer, has class type M (or array thereof) and 4490 // either M has no default constructor or overload resolution as applied 4491 // to M's default constructor results in an ambiguity or in a function 4492 // that is deleted or inaccessible 4493 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4494 // -- a direct or virtual base class B that cannot be copied/moved because 4495 // overload resolution, as applied to B's corresponding special member, 4496 // results in an ambiguity or a function that is deleted or inaccessible 4497 // from the defaulted special member 4498 // C++11 [class.dtor]p5: 4499 // -- any direct or virtual base class [...] has a type with a destructor 4500 // that is deleted or inaccessible 4501 if (!(CSM == Sema::CXXDefaultConstructor && 4502 Field && Field->hasInClassInitializer()) && 4503 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class), false)) 4504 return true; 4505 4506 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4507 // -- any direct or virtual base class or non-static data member has a 4508 // type with a destructor that is deleted or inaccessible 4509 if (IsConstructor) { 4510 Sema::SpecialMemberOverloadResult *SMOR = 4511 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4512 false, false, false, false, false); 4513 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4514 return true; 4515 } 4516 4517 return false; 4518} 4519 4520/// Check whether we should delete a special member function due to the class 4521/// having a particular direct or virtual base class. 4522bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4523 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4524 return shouldDeleteForClassSubobject(BaseClass, Base); 4525} 4526 4527/// Check whether we should delete a special member function due to the class 4528/// having a particular non-static data member. 4529bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4530 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4531 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4532 4533 if (CSM == Sema::CXXDefaultConstructor) { 4534 // For a default constructor, all references must be initialized in-class 4535 // and, if a union, it must have a non-const member. 4536 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4537 if (Diagnose) 4538 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4539 << MD->getParent() << FD << FieldType << /*Reference*/0; 4540 return true; 4541 } 4542 // C++11 [class.ctor]p5: any non-variant non-static data member of 4543 // const-qualified type (or array thereof) with no 4544 // brace-or-equal-initializer does not have a user-provided default 4545 // constructor. 4546 if (!inUnion() && FieldType.isConstQualified() && 4547 !FD->hasInClassInitializer() && 4548 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4549 if (Diagnose) 4550 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4551 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4552 return true; 4553 } 4554 4555 if (inUnion() && !FieldType.isConstQualified()) 4556 AllFieldsAreConst = false; 4557 } else if (CSM == Sema::CXXCopyConstructor) { 4558 // For a copy constructor, data members must not be of rvalue reference 4559 // type. 4560 if (FieldType->isRValueReferenceType()) { 4561 if (Diagnose) 4562 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4563 << MD->getParent() << FD << FieldType; 4564 return true; 4565 } 4566 } else if (IsAssignment) { 4567 // For an assignment operator, data members must not be of reference type. 4568 if (FieldType->isReferenceType()) { 4569 if (Diagnose) 4570 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4571 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4572 return true; 4573 } 4574 if (!FieldRecord && FieldType.isConstQualified()) { 4575 // C++11 [class.copy]p23: 4576 // -- a non-static data member of const non-class type (or array thereof) 4577 if (Diagnose) 4578 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4579 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4580 return true; 4581 } 4582 } 4583 4584 if (FieldRecord) { 4585 // Some additional restrictions exist on the variant members. 4586 if (!inUnion() && FieldRecord->isUnion() && 4587 FieldRecord->isAnonymousStructOrUnion()) { 4588 bool AllVariantFieldsAreConst = true; 4589 4590 // FIXME: Handle anonymous unions declared within anonymous unions. 4591 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4592 UE = FieldRecord->field_end(); 4593 UI != UE; ++UI) { 4594 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4595 4596 if (!UnionFieldType.isConstQualified()) 4597 AllVariantFieldsAreConst = false; 4598 4599 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4600 if (UnionFieldRecord && 4601 shouldDeleteForClassSubobject(UnionFieldRecord, &*UI)) 4602 return true; 4603 } 4604 4605 // At least one member in each anonymous union must be non-const 4606 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4607 FieldRecord->field_begin() != FieldRecord->field_end()) { 4608 if (Diagnose) 4609 S.Diag(FieldRecord->getLocation(), 4610 diag::note_deleted_default_ctor_all_const) 4611 << MD->getParent() << /*anonymous union*/1; 4612 return true; 4613 } 4614 4615 // Don't check the implicit member of the anonymous union type. 4616 // This is technically non-conformant, but sanity demands it. 4617 return false; 4618 } 4619 4620 if (shouldDeleteForClassSubobject(FieldRecord, FD)) 4621 return true; 4622 } 4623 4624 return false; 4625} 4626 4627/// C++11 [class.ctor] p5: 4628/// A defaulted default constructor for a class X is defined as deleted if 4629/// X is a union and all of its variant members are of const-qualified type. 4630bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4631 // This is a silly definition, because it gives an empty union a deleted 4632 // default constructor. Don't do that. 4633 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4634 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4635 if (Diagnose) 4636 S.Diag(MD->getParent()->getLocation(), 4637 diag::note_deleted_default_ctor_all_const) 4638 << MD->getParent() << /*not anonymous union*/0; 4639 return true; 4640 } 4641 return false; 4642} 4643 4644/// Determine whether a defaulted special member function should be defined as 4645/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4646/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4647bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4648 bool Diagnose) { 4649 assert(!MD->isInvalidDecl()); 4650 CXXRecordDecl *RD = MD->getParent(); 4651 assert(!RD->isDependentType() && "do deletion after instantiation"); 4652 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4653 return false; 4654 4655 // C++11 [expr.lambda.prim]p19: 4656 // The closure type associated with a lambda-expression has a 4657 // deleted (8.4.3) default constructor and a deleted copy 4658 // assignment operator. 4659 if (RD->isLambda() && 4660 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4661 if (Diagnose) 4662 Diag(RD->getLocation(), diag::note_lambda_decl); 4663 return true; 4664 } 4665 4666 // For an anonymous struct or union, the copy and assignment special members 4667 // will never be used, so skip the check. For an anonymous union declared at 4668 // namespace scope, the constructor and destructor are used. 4669 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4670 RD->isAnonymousStructOrUnion()) 4671 return false; 4672 4673 // C++11 [class.copy]p7, p18: 4674 // If the class definition declares a move constructor or move assignment 4675 // operator, an implicitly declared copy constructor or copy assignment 4676 // operator is defined as deleted. 4677 if (MD->isImplicit() && 4678 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4679 CXXMethodDecl *UserDeclaredMove = 0; 4680 4681 // In Microsoft mode, a user-declared move only causes the deletion of the 4682 // corresponding copy operation, not both copy operations. 4683 if (RD->hasUserDeclaredMoveConstructor() && 4684 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4685 if (!Diagnose) return true; 4686 UserDeclaredMove = RD->getMoveConstructor(); 4687 assert(UserDeclaredMove); 4688 } else if (RD->hasUserDeclaredMoveAssignment() && 4689 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4690 if (!Diagnose) return true; 4691 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4692 assert(UserDeclaredMove); 4693 } 4694 4695 if (UserDeclaredMove) { 4696 Diag(UserDeclaredMove->getLocation(), 4697 diag::note_deleted_copy_user_declared_move) 4698 << (CSM == CXXCopyAssignment) << RD 4699 << UserDeclaredMove->isMoveAssignmentOperator(); 4700 return true; 4701 } 4702 } 4703 4704 // Do access control from the special member function 4705 ContextRAII MethodContext(*this, MD); 4706 4707 // C++11 [class.dtor]p5: 4708 // -- for a virtual destructor, lookup of the non-array deallocation function 4709 // results in an ambiguity or in a function that is deleted or inaccessible 4710 if (CSM == CXXDestructor && MD->isVirtual()) { 4711 FunctionDecl *OperatorDelete = 0; 4712 DeclarationName Name = 4713 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4714 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4715 OperatorDelete, false)) { 4716 if (Diagnose) 4717 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4718 return true; 4719 } 4720 } 4721 4722 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4723 4724 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4725 BE = RD->bases_end(); BI != BE; ++BI) 4726 if (!BI->isVirtual() && 4727 SMI.shouldDeleteForBase(BI)) 4728 return true; 4729 4730 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4731 BE = RD->vbases_end(); BI != BE; ++BI) 4732 if (SMI.shouldDeleteForBase(BI)) 4733 return true; 4734 4735 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4736 FE = RD->field_end(); FI != FE; ++FI) 4737 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4738 SMI.shouldDeleteForField(&*FI)) 4739 return true; 4740 4741 if (SMI.shouldDeleteForAllConstMembers()) 4742 return true; 4743 4744 return false; 4745} 4746 4747/// \brief Data used with FindHiddenVirtualMethod 4748namespace { 4749 struct FindHiddenVirtualMethodData { 4750 Sema *S; 4751 CXXMethodDecl *Method; 4752 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4753 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4754 }; 4755} 4756 4757/// \brief Member lookup function that determines whether a given C++ 4758/// method overloads virtual methods in a base class without overriding any, 4759/// to be used with CXXRecordDecl::lookupInBases(). 4760static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4761 CXXBasePath &Path, 4762 void *UserData) { 4763 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4764 4765 FindHiddenVirtualMethodData &Data 4766 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4767 4768 DeclarationName Name = Data.Method->getDeclName(); 4769 assert(Name.getNameKind() == DeclarationName::Identifier); 4770 4771 bool foundSameNameMethod = false; 4772 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4773 for (Path.Decls = BaseRecord->lookup(Name); 4774 Path.Decls.first != Path.Decls.second; 4775 ++Path.Decls.first) { 4776 NamedDecl *D = *Path.Decls.first; 4777 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4778 MD = MD->getCanonicalDecl(); 4779 foundSameNameMethod = true; 4780 // Interested only in hidden virtual methods. 4781 if (!MD->isVirtual()) 4782 continue; 4783 // If the method we are checking overrides a method from its base 4784 // don't warn about the other overloaded methods. 4785 if (!Data.S->IsOverload(Data.Method, MD, false)) 4786 return true; 4787 // Collect the overload only if its hidden. 4788 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4789 overloadedMethods.push_back(MD); 4790 } 4791 } 4792 4793 if (foundSameNameMethod) 4794 Data.OverloadedMethods.append(overloadedMethods.begin(), 4795 overloadedMethods.end()); 4796 return foundSameNameMethod; 4797} 4798 4799/// \brief See if a method overloads virtual methods in a base class without 4800/// overriding any. 4801void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4802 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4803 MD->getLocation()) == DiagnosticsEngine::Ignored) 4804 return; 4805 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4806 return; 4807 4808 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4809 /*bool RecordPaths=*/false, 4810 /*bool DetectVirtual=*/false); 4811 FindHiddenVirtualMethodData Data; 4812 Data.Method = MD; 4813 Data.S = this; 4814 4815 // Keep the base methods that were overriden or introduced in the subclass 4816 // by 'using' in a set. A base method not in this set is hidden. 4817 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4818 res.first != res.second; ++res.first) { 4819 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4820 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4821 E = MD->end_overridden_methods(); 4822 I != E; ++I) 4823 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4824 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4825 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4826 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4827 } 4828 4829 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4830 !Data.OverloadedMethods.empty()) { 4831 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4832 << MD << (Data.OverloadedMethods.size() > 1); 4833 4834 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4835 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4836 Diag(overloadedMD->getLocation(), 4837 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4838 } 4839 } 4840} 4841 4842void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4843 Decl *TagDecl, 4844 SourceLocation LBrac, 4845 SourceLocation RBrac, 4846 AttributeList *AttrList) { 4847 if (!TagDecl) 4848 return; 4849 4850 AdjustDeclIfTemplate(TagDecl); 4851 4852 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4853 // strict aliasing violation! 4854 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4855 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4856 4857 CheckCompletedCXXClass( 4858 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4859} 4860 4861/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4862/// special functions, such as the default constructor, copy 4863/// constructor, or destructor, to the given C++ class (C++ 4864/// [special]p1). This routine can only be executed just before the 4865/// definition of the class is complete. 4866void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4867 if (!ClassDecl->hasUserDeclaredConstructor()) 4868 ++ASTContext::NumImplicitDefaultConstructors; 4869 4870 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4871 ++ASTContext::NumImplicitCopyConstructors; 4872 4873 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4874 ++ASTContext::NumImplicitMoveConstructors; 4875 4876 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4877 ++ASTContext::NumImplicitCopyAssignmentOperators; 4878 4879 // If we have a dynamic class, then the copy assignment operator may be 4880 // virtual, so we have to declare it immediately. This ensures that, e.g., 4881 // it shows up in the right place in the vtable and that we diagnose 4882 // problems with the implicit exception specification. 4883 if (ClassDecl->isDynamicClass()) 4884 DeclareImplicitCopyAssignment(ClassDecl); 4885 } 4886 4887 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4888 ++ASTContext::NumImplicitMoveAssignmentOperators; 4889 4890 // Likewise for the move assignment operator. 4891 if (ClassDecl->isDynamicClass()) 4892 DeclareImplicitMoveAssignment(ClassDecl); 4893 } 4894 4895 if (!ClassDecl->hasUserDeclaredDestructor()) { 4896 ++ASTContext::NumImplicitDestructors; 4897 4898 // If we have a dynamic class, then the destructor may be virtual, so we 4899 // have to declare the destructor immediately. This ensures that, e.g., it 4900 // shows up in the right place in the vtable and that we diagnose problems 4901 // with the implicit exception specification. 4902 if (ClassDecl->isDynamicClass()) 4903 DeclareImplicitDestructor(ClassDecl); 4904 } 4905} 4906 4907void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4908 if (!D) 4909 return; 4910 4911 int NumParamList = D->getNumTemplateParameterLists(); 4912 for (int i = 0; i < NumParamList; i++) { 4913 TemplateParameterList* Params = D->getTemplateParameterList(i); 4914 for (TemplateParameterList::iterator Param = Params->begin(), 4915 ParamEnd = Params->end(); 4916 Param != ParamEnd; ++Param) { 4917 NamedDecl *Named = cast<NamedDecl>(*Param); 4918 if (Named->getDeclName()) { 4919 S->AddDecl(Named); 4920 IdResolver.AddDecl(Named); 4921 } 4922 } 4923 } 4924} 4925 4926void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4927 if (!D) 4928 return; 4929 4930 TemplateParameterList *Params = 0; 4931 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4932 Params = Template->getTemplateParameters(); 4933 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4934 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4935 Params = PartialSpec->getTemplateParameters(); 4936 else 4937 return; 4938 4939 for (TemplateParameterList::iterator Param = Params->begin(), 4940 ParamEnd = Params->end(); 4941 Param != ParamEnd; ++Param) { 4942 NamedDecl *Named = cast<NamedDecl>(*Param); 4943 if (Named->getDeclName()) { 4944 S->AddDecl(Named); 4945 IdResolver.AddDecl(Named); 4946 } 4947 } 4948} 4949 4950void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4951 if (!RecordD) return; 4952 AdjustDeclIfTemplate(RecordD); 4953 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4954 PushDeclContext(S, Record); 4955} 4956 4957void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4958 if (!RecordD) return; 4959 PopDeclContext(); 4960} 4961 4962/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4963/// parsing a top-level (non-nested) C++ class, and we are now 4964/// parsing those parts of the given Method declaration that could 4965/// not be parsed earlier (C++ [class.mem]p2), such as default 4966/// arguments. This action should enter the scope of the given 4967/// Method declaration as if we had just parsed the qualified method 4968/// name. However, it should not bring the parameters into scope; 4969/// that will be performed by ActOnDelayedCXXMethodParameter. 4970void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4971} 4972 4973/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4974/// C++ method declaration. We're (re-)introducing the given 4975/// function parameter into scope for use in parsing later parts of 4976/// the method declaration. For example, we could see an 4977/// ActOnParamDefaultArgument event for this parameter. 4978void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4979 if (!ParamD) 4980 return; 4981 4982 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4983 4984 // If this parameter has an unparsed default argument, clear it out 4985 // to make way for the parsed default argument. 4986 if (Param->hasUnparsedDefaultArg()) 4987 Param->setDefaultArg(0); 4988 4989 S->AddDecl(Param); 4990 if (Param->getDeclName()) 4991 IdResolver.AddDecl(Param); 4992} 4993 4994/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4995/// processing the delayed method declaration for Method. The method 4996/// declaration is now considered finished. There may be a separate 4997/// ActOnStartOfFunctionDef action later (not necessarily 4998/// immediately!) for this method, if it was also defined inside the 4999/// class body. 5000void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5001 if (!MethodD) 5002 return; 5003 5004 AdjustDeclIfTemplate(MethodD); 5005 5006 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5007 5008 // Now that we have our default arguments, check the constructor 5009 // again. It could produce additional diagnostics or affect whether 5010 // the class has implicitly-declared destructors, among other 5011 // things. 5012 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5013 CheckConstructor(Constructor); 5014 5015 // Check the default arguments, which we may have added. 5016 if (!Method->isInvalidDecl()) 5017 CheckCXXDefaultArguments(Method); 5018} 5019 5020/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5021/// the well-formedness of the constructor declarator @p D with type @p 5022/// R. If there are any errors in the declarator, this routine will 5023/// emit diagnostics and set the invalid bit to true. In any case, the type 5024/// will be updated to reflect a well-formed type for the constructor and 5025/// returned. 5026QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5027 StorageClass &SC) { 5028 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5029 5030 // C++ [class.ctor]p3: 5031 // A constructor shall not be virtual (10.3) or static (9.4). A 5032 // constructor can be invoked for a const, volatile or const 5033 // volatile object. A constructor shall not be declared const, 5034 // volatile, or const volatile (9.3.2). 5035 if (isVirtual) { 5036 if (!D.isInvalidType()) 5037 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5038 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5039 << SourceRange(D.getIdentifierLoc()); 5040 D.setInvalidType(); 5041 } 5042 if (SC == SC_Static) { 5043 if (!D.isInvalidType()) 5044 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5045 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5046 << SourceRange(D.getIdentifierLoc()); 5047 D.setInvalidType(); 5048 SC = SC_None; 5049 } 5050 5051 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5052 if (FTI.TypeQuals != 0) { 5053 if (FTI.TypeQuals & Qualifiers::Const) 5054 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5055 << "const" << SourceRange(D.getIdentifierLoc()); 5056 if (FTI.TypeQuals & Qualifiers::Volatile) 5057 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5058 << "volatile" << SourceRange(D.getIdentifierLoc()); 5059 if (FTI.TypeQuals & Qualifiers::Restrict) 5060 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5061 << "restrict" << SourceRange(D.getIdentifierLoc()); 5062 D.setInvalidType(); 5063 } 5064 5065 // C++0x [class.ctor]p4: 5066 // A constructor shall not be declared with a ref-qualifier. 5067 if (FTI.hasRefQualifier()) { 5068 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5069 << FTI.RefQualifierIsLValueRef 5070 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5071 D.setInvalidType(); 5072 } 5073 5074 // Rebuild the function type "R" without any type qualifiers (in 5075 // case any of the errors above fired) and with "void" as the 5076 // return type, since constructors don't have return types. 5077 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5078 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5079 return R; 5080 5081 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5082 EPI.TypeQuals = 0; 5083 EPI.RefQualifier = RQ_None; 5084 5085 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5086 Proto->getNumArgs(), EPI); 5087} 5088 5089/// CheckConstructor - Checks a fully-formed constructor for 5090/// well-formedness, issuing any diagnostics required. Returns true if 5091/// the constructor declarator is invalid. 5092void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5093 CXXRecordDecl *ClassDecl 5094 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5095 if (!ClassDecl) 5096 return Constructor->setInvalidDecl(); 5097 5098 // C++ [class.copy]p3: 5099 // A declaration of a constructor for a class X is ill-formed if 5100 // its first parameter is of type (optionally cv-qualified) X and 5101 // either there are no other parameters or else all other 5102 // parameters have default arguments. 5103 if (!Constructor->isInvalidDecl() && 5104 ((Constructor->getNumParams() == 1) || 5105 (Constructor->getNumParams() > 1 && 5106 Constructor->getParamDecl(1)->hasDefaultArg())) && 5107 Constructor->getTemplateSpecializationKind() 5108 != TSK_ImplicitInstantiation) { 5109 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5110 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5111 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5112 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5113 const char *ConstRef 5114 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5115 : " const &"; 5116 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5117 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5118 5119 // FIXME: Rather that making the constructor invalid, we should endeavor 5120 // to fix the type. 5121 Constructor->setInvalidDecl(); 5122 } 5123 } 5124} 5125 5126/// CheckDestructor - Checks a fully-formed destructor definition for 5127/// well-formedness, issuing any diagnostics required. Returns true 5128/// on error. 5129bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5130 CXXRecordDecl *RD = Destructor->getParent(); 5131 5132 if (Destructor->isVirtual()) { 5133 SourceLocation Loc; 5134 5135 if (!Destructor->isImplicit()) 5136 Loc = Destructor->getLocation(); 5137 else 5138 Loc = RD->getLocation(); 5139 5140 // If we have a virtual destructor, look up the deallocation function 5141 FunctionDecl *OperatorDelete = 0; 5142 DeclarationName Name = 5143 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5144 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5145 return true; 5146 5147 MarkFunctionReferenced(Loc, OperatorDelete); 5148 5149 Destructor->setOperatorDelete(OperatorDelete); 5150 } 5151 5152 return false; 5153} 5154 5155static inline bool 5156FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5157 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5158 FTI.ArgInfo[0].Param && 5159 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5160} 5161 5162/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5163/// the well-formednes of the destructor declarator @p D with type @p 5164/// R. If there are any errors in the declarator, this routine will 5165/// emit diagnostics and set the declarator to invalid. Even if this happens, 5166/// will be updated to reflect a well-formed type for the destructor and 5167/// returned. 5168QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5169 StorageClass& SC) { 5170 // C++ [class.dtor]p1: 5171 // [...] A typedef-name that names a class is a class-name 5172 // (7.1.3); however, a typedef-name that names a class shall not 5173 // be used as the identifier in the declarator for a destructor 5174 // declaration. 5175 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5176 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5177 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5178 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5179 else if (const TemplateSpecializationType *TST = 5180 DeclaratorType->getAs<TemplateSpecializationType>()) 5181 if (TST->isTypeAlias()) 5182 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5183 << DeclaratorType << 1; 5184 5185 // C++ [class.dtor]p2: 5186 // A destructor is used to destroy objects of its class type. A 5187 // destructor takes no parameters, and no return type can be 5188 // specified for it (not even void). The address of a destructor 5189 // shall not be taken. A destructor shall not be static. A 5190 // destructor can be invoked for a const, volatile or const 5191 // volatile object. A destructor shall not be declared const, 5192 // volatile or const volatile (9.3.2). 5193 if (SC == SC_Static) { 5194 if (!D.isInvalidType()) 5195 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5196 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5197 << SourceRange(D.getIdentifierLoc()) 5198 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5199 5200 SC = SC_None; 5201 } 5202 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5203 // Destructors don't have return types, but the parser will 5204 // happily parse something like: 5205 // 5206 // class X { 5207 // float ~X(); 5208 // }; 5209 // 5210 // The return type will be eliminated later. 5211 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5212 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5213 << SourceRange(D.getIdentifierLoc()); 5214 } 5215 5216 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5217 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5218 if (FTI.TypeQuals & Qualifiers::Const) 5219 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5220 << "const" << SourceRange(D.getIdentifierLoc()); 5221 if (FTI.TypeQuals & Qualifiers::Volatile) 5222 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5223 << "volatile" << SourceRange(D.getIdentifierLoc()); 5224 if (FTI.TypeQuals & Qualifiers::Restrict) 5225 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5226 << "restrict" << SourceRange(D.getIdentifierLoc()); 5227 D.setInvalidType(); 5228 } 5229 5230 // C++0x [class.dtor]p2: 5231 // A destructor shall not be declared with a ref-qualifier. 5232 if (FTI.hasRefQualifier()) { 5233 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5234 << FTI.RefQualifierIsLValueRef 5235 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5236 D.setInvalidType(); 5237 } 5238 5239 // Make sure we don't have any parameters. 5240 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5241 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5242 5243 // Delete the parameters. 5244 FTI.freeArgs(); 5245 D.setInvalidType(); 5246 } 5247 5248 // Make sure the destructor isn't variadic. 5249 if (FTI.isVariadic) { 5250 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5251 D.setInvalidType(); 5252 } 5253 5254 // Rebuild the function type "R" without any type qualifiers or 5255 // parameters (in case any of the errors above fired) and with 5256 // "void" as the return type, since destructors don't have return 5257 // types. 5258 if (!D.isInvalidType()) 5259 return R; 5260 5261 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5262 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5263 EPI.Variadic = false; 5264 EPI.TypeQuals = 0; 5265 EPI.RefQualifier = RQ_None; 5266 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5267} 5268 5269/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5270/// well-formednes of the conversion function declarator @p D with 5271/// type @p R. If there are any errors in the declarator, this routine 5272/// will emit diagnostics and return true. Otherwise, it will return 5273/// false. Either way, the type @p R will be updated to reflect a 5274/// well-formed type for the conversion operator. 5275void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5276 StorageClass& SC) { 5277 // C++ [class.conv.fct]p1: 5278 // Neither parameter types nor return type can be specified. The 5279 // type of a conversion function (8.3.5) is "function taking no 5280 // parameter returning conversion-type-id." 5281 if (SC == SC_Static) { 5282 if (!D.isInvalidType()) 5283 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5284 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5285 << SourceRange(D.getIdentifierLoc()); 5286 D.setInvalidType(); 5287 SC = SC_None; 5288 } 5289 5290 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5291 5292 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5293 // Conversion functions don't have return types, but the parser will 5294 // happily parse something like: 5295 // 5296 // class X { 5297 // float operator bool(); 5298 // }; 5299 // 5300 // The return type will be changed later anyway. 5301 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5302 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5303 << SourceRange(D.getIdentifierLoc()); 5304 D.setInvalidType(); 5305 } 5306 5307 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5308 5309 // Make sure we don't have any parameters. 5310 if (Proto->getNumArgs() > 0) { 5311 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5312 5313 // Delete the parameters. 5314 D.getFunctionTypeInfo().freeArgs(); 5315 D.setInvalidType(); 5316 } else if (Proto->isVariadic()) { 5317 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5318 D.setInvalidType(); 5319 } 5320 5321 // Diagnose "&operator bool()" and other such nonsense. This 5322 // is actually a gcc extension which we don't support. 5323 if (Proto->getResultType() != ConvType) { 5324 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5325 << Proto->getResultType(); 5326 D.setInvalidType(); 5327 ConvType = Proto->getResultType(); 5328 } 5329 5330 // C++ [class.conv.fct]p4: 5331 // The conversion-type-id shall not represent a function type nor 5332 // an array type. 5333 if (ConvType->isArrayType()) { 5334 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5335 ConvType = Context.getPointerType(ConvType); 5336 D.setInvalidType(); 5337 } else if (ConvType->isFunctionType()) { 5338 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5339 ConvType = Context.getPointerType(ConvType); 5340 D.setInvalidType(); 5341 } 5342 5343 // Rebuild the function type "R" without any parameters (in case any 5344 // of the errors above fired) and with the conversion type as the 5345 // return type. 5346 if (D.isInvalidType()) 5347 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5348 5349 // C++0x explicit conversion operators. 5350 if (D.getDeclSpec().isExplicitSpecified()) 5351 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5352 getLangOpts().CPlusPlus0x ? 5353 diag::warn_cxx98_compat_explicit_conversion_functions : 5354 diag::ext_explicit_conversion_functions) 5355 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5356} 5357 5358/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5359/// the declaration of the given C++ conversion function. This routine 5360/// is responsible for recording the conversion function in the C++ 5361/// class, if possible. 5362Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5363 assert(Conversion && "Expected to receive a conversion function declaration"); 5364 5365 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5366 5367 // Make sure we aren't redeclaring the conversion function. 5368 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5369 5370 // C++ [class.conv.fct]p1: 5371 // [...] A conversion function is never used to convert a 5372 // (possibly cv-qualified) object to the (possibly cv-qualified) 5373 // same object type (or a reference to it), to a (possibly 5374 // cv-qualified) base class of that type (or a reference to it), 5375 // or to (possibly cv-qualified) void. 5376 // FIXME: Suppress this warning if the conversion function ends up being a 5377 // virtual function that overrides a virtual function in a base class. 5378 QualType ClassType 5379 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5380 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5381 ConvType = ConvTypeRef->getPointeeType(); 5382 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5383 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5384 /* Suppress diagnostics for instantiations. */; 5385 else if (ConvType->isRecordType()) { 5386 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5387 if (ConvType == ClassType) 5388 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5389 << ClassType; 5390 else if (IsDerivedFrom(ClassType, ConvType)) 5391 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5392 << ClassType << ConvType; 5393 } else if (ConvType->isVoidType()) { 5394 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5395 << ClassType << ConvType; 5396 } 5397 5398 if (FunctionTemplateDecl *ConversionTemplate 5399 = Conversion->getDescribedFunctionTemplate()) 5400 return ConversionTemplate; 5401 5402 return Conversion; 5403} 5404 5405//===----------------------------------------------------------------------===// 5406// Namespace Handling 5407//===----------------------------------------------------------------------===// 5408 5409 5410 5411/// ActOnStartNamespaceDef - This is called at the start of a namespace 5412/// definition. 5413Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5414 SourceLocation InlineLoc, 5415 SourceLocation NamespaceLoc, 5416 SourceLocation IdentLoc, 5417 IdentifierInfo *II, 5418 SourceLocation LBrace, 5419 AttributeList *AttrList) { 5420 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5421 // For anonymous namespace, take the location of the left brace. 5422 SourceLocation Loc = II ? IdentLoc : LBrace; 5423 bool IsInline = InlineLoc.isValid(); 5424 bool IsInvalid = false; 5425 bool IsStd = false; 5426 bool AddToKnown = false; 5427 Scope *DeclRegionScope = NamespcScope->getParent(); 5428 5429 NamespaceDecl *PrevNS = 0; 5430 if (II) { 5431 // C++ [namespace.def]p2: 5432 // The identifier in an original-namespace-definition shall not 5433 // have been previously defined in the declarative region in 5434 // which the original-namespace-definition appears. The 5435 // identifier in an original-namespace-definition is the name of 5436 // the namespace. Subsequently in that declarative region, it is 5437 // treated as an original-namespace-name. 5438 // 5439 // Since namespace names are unique in their scope, and we don't 5440 // look through using directives, just look for any ordinary names. 5441 5442 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5443 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5444 Decl::IDNS_Namespace; 5445 NamedDecl *PrevDecl = 0; 5446 for (DeclContext::lookup_result R 5447 = CurContext->getRedeclContext()->lookup(II); 5448 R.first != R.second; ++R.first) { 5449 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5450 PrevDecl = *R.first; 5451 break; 5452 } 5453 } 5454 5455 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5456 5457 if (PrevNS) { 5458 // This is an extended namespace definition. 5459 if (IsInline != PrevNS->isInline()) { 5460 // inline-ness must match 5461 if (PrevNS->isInline()) { 5462 // The user probably just forgot the 'inline', so suggest that it 5463 // be added back. 5464 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5465 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5466 } else { 5467 Diag(Loc, diag::err_inline_namespace_mismatch) 5468 << IsInline; 5469 } 5470 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5471 5472 IsInline = PrevNS->isInline(); 5473 } 5474 } else if (PrevDecl) { 5475 // This is an invalid name redefinition. 5476 Diag(Loc, diag::err_redefinition_different_kind) 5477 << II; 5478 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5479 IsInvalid = true; 5480 // Continue on to push Namespc as current DeclContext and return it. 5481 } else if (II->isStr("std") && 5482 CurContext->getRedeclContext()->isTranslationUnit()) { 5483 // This is the first "real" definition of the namespace "std", so update 5484 // our cache of the "std" namespace to point at this definition. 5485 PrevNS = getStdNamespace(); 5486 IsStd = true; 5487 AddToKnown = !IsInline; 5488 } else { 5489 // We've seen this namespace for the first time. 5490 AddToKnown = !IsInline; 5491 } 5492 } else { 5493 // Anonymous namespaces. 5494 5495 // Determine whether the parent already has an anonymous namespace. 5496 DeclContext *Parent = CurContext->getRedeclContext(); 5497 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5498 PrevNS = TU->getAnonymousNamespace(); 5499 } else { 5500 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5501 PrevNS = ND->getAnonymousNamespace(); 5502 } 5503 5504 if (PrevNS && IsInline != PrevNS->isInline()) { 5505 // inline-ness must match 5506 Diag(Loc, diag::err_inline_namespace_mismatch) 5507 << IsInline; 5508 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5509 5510 // Recover by ignoring the new namespace's inline status. 5511 IsInline = PrevNS->isInline(); 5512 } 5513 } 5514 5515 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5516 StartLoc, Loc, II, PrevNS); 5517 if (IsInvalid) 5518 Namespc->setInvalidDecl(); 5519 5520 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5521 5522 // FIXME: Should we be merging attributes? 5523 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5524 PushNamespaceVisibilityAttr(Attr, Loc); 5525 5526 if (IsStd) 5527 StdNamespace = Namespc; 5528 if (AddToKnown) 5529 KnownNamespaces[Namespc] = false; 5530 5531 if (II) { 5532 PushOnScopeChains(Namespc, DeclRegionScope); 5533 } else { 5534 // Link the anonymous namespace into its parent. 5535 DeclContext *Parent = CurContext->getRedeclContext(); 5536 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5537 TU->setAnonymousNamespace(Namespc); 5538 } else { 5539 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5540 } 5541 5542 CurContext->addDecl(Namespc); 5543 5544 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5545 // behaves as if it were replaced by 5546 // namespace unique { /* empty body */ } 5547 // using namespace unique; 5548 // namespace unique { namespace-body } 5549 // where all occurrences of 'unique' in a translation unit are 5550 // replaced by the same identifier and this identifier differs 5551 // from all other identifiers in the entire program. 5552 5553 // We just create the namespace with an empty name and then add an 5554 // implicit using declaration, just like the standard suggests. 5555 // 5556 // CodeGen enforces the "universally unique" aspect by giving all 5557 // declarations semantically contained within an anonymous 5558 // namespace internal linkage. 5559 5560 if (!PrevNS) { 5561 UsingDirectiveDecl* UD 5562 = UsingDirectiveDecl::Create(Context, CurContext, 5563 /* 'using' */ LBrace, 5564 /* 'namespace' */ SourceLocation(), 5565 /* qualifier */ NestedNameSpecifierLoc(), 5566 /* identifier */ SourceLocation(), 5567 Namespc, 5568 /* Ancestor */ CurContext); 5569 UD->setImplicit(); 5570 CurContext->addDecl(UD); 5571 } 5572 } 5573 5574 // Although we could have an invalid decl (i.e. the namespace name is a 5575 // redefinition), push it as current DeclContext and try to continue parsing. 5576 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5577 // for the namespace has the declarations that showed up in that particular 5578 // namespace definition. 5579 PushDeclContext(NamespcScope, Namespc); 5580 return Namespc; 5581} 5582 5583/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5584/// is a namespace alias, returns the namespace it points to. 5585static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5586 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5587 return AD->getNamespace(); 5588 return dyn_cast_or_null<NamespaceDecl>(D); 5589} 5590 5591/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5592/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5593void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5594 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5595 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5596 Namespc->setRBraceLoc(RBrace); 5597 PopDeclContext(); 5598 if (Namespc->hasAttr<VisibilityAttr>()) 5599 PopPragmaVisibility(true, RBrace); 5600} 5601 5602CXXRecordDecl *Sema::getStdBadAlloc() const { 5603 return cast_or_null<CXXRecordDecl>( 5604 StdBadAlloc.get(Context.getExternalSource())); 5605} 5606 5607NamespaceDecl *Sema::getStdNamespace() const { 5608 return cast_or_null<NamespaceDecl>( 5609 StdNamespace.get(Context.getExternalSource())); 5610} 5611 5612/// \brief Retrieve the special "std" namespace, which may require us to 5613/// implicitly define the namespace. 5614NamespaceDecl *Sema::getOrCreateStdNamespace() { 5615 if (!StdNamespace) { 5616 // The "std" namespace has not yet been defined, so build one implicitly. 5617 StdNamespace = NamespaceDecl::Create(Context, 5618 Context.getTranslationUnitDecl(), 5619 /*Inline=*/false, 5620 SourceLocation(), SourceLocation(), 5621 &PP.getIdentifierTable().get("std"), 5622 /*PrevDecl=*/0); 5623 getStdNamespace()->setImplicit(true); 5624 } 5625 5626 return getStdNamespace(); 5627} 5628 5629bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5630 assert(getLangOpts().CPlusPlus && 5631 "Looking for std::initializer_list outside of C++."); 5632 5633 // We're looking for implicit instantiations of 5634 // template <typename E> class std::initializer_list. 5635 5636 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5637 return false; 5638 5639 ClassTemplateDecl *Template = 0; 5640 const TemplateArgument *Arguments = 0; 5641 5642 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5643 5644 ClassTemplateSpecializationDecl *Specialization = 5645 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5646 if (!Specialization) 5647 return false; 5648 5649 Template = Specialization->getSpecializedTemplate(); 5650 Arguments = Specialization->getTemplateArgs().data(); 5651 } else if (const TemplateSpecializationType *TST = 5652 Ty->getAs<TemplateSpecializationType>()) { 5653 Template = dyn_cast_or_null<ClassTemplateDecl>( 5654 TST->getTemplateName().getAsTemplateDecl()); 5655 Arguments = TST->getArgs(); 5656 } 5657 if (!Template) 5658 return false; 5659 5660 if (!StdInitializerList) { 5661 // Haven't recognized std::initializer_list yet, maybe this is it. 5662 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5663 if (TemplateClass->getIdentifier() != 5664 &PP.getIdentifierTable().get("initializer_list") || 5665 !getStdNamespace()->InEnclosingNamespaceSetOf( 5666 TemplateClass->getDeclContext())) 5667 return false; 5668 // This is a template called std::initializer_list, but is it the right 5669 // template? 5670 TemplateParameterList *Params = Template->getTemplateParameters(); 5671 if (Params->getMinRequiredArguments() != 1) 5672 return false; 5673 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5674 return false; 5675 5676 // It's the right template. 5677 StdInitializerList = Template; 5678 } 5679 5680 if (Template != StdInitializerList) 5681 return false; 5682 5683 // This is an instance of std::initializer_list. Find the argument type. 5684 if (Element) 5685 *Element = Arguments[0].getAsType(); 5686 return true; 5687} 5688 5689static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5690 NamespaceDecl *Std = S.getStdNamespace(); 5691 if (!Std) { 5692 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5693 return 0; 5694 } 5695 5696 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5697 Loc, Sema::LookupOrdinaryName); 5698 if (!S.LookupQualifiedName(Result, Std)) { 5699 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5700 return 0; 5701 } 5702 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5703 if (!Template) { 5704 Result.suppressDiagnostics(); 5705 // We found something weird. Complain about the first thing we found. 5706 NamedDecl *Found = *Result.begin(); 5707 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5708 return 0; 5709 } 5710 5711 // We found some template called std::initializer_list. Now verify that it's 5712 // correct. 5713 TemplateParameterList *Params = Template->getTemplateParameters(); 5714 if (Params->getMinRequiredArguments() != 1 || 5715 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5716 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5717 return 0; 5718 } 5719 5720 return Template; 5721} 5722 5723QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5724 if (!StdInitializerList) { 5725 StdInitializerList = LookupStdInitializerList(*this, Loc); 5726 if (!StdInitializerList) 5727 return QualType(); 5728 } 5729 5730 TemplateArgumentListInfo Args(Loc, Loc); 5731 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5732 Context.getTrivialTypeSourceInfo(Element, 5733 Loc))); 5734 return Context.getCanonicalType( 5735 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5736} 5737 5738bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5739 // C++ [dcl.init.list]p2: 5740 // A constructor is an initializer-list constructor if its first parameter 5741 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5742 // std::initializer_list<E> for some type E, and either there are no other 5743 // parameters or else all other parameters have default arguments. 5744 if (Ctor->getNumParams() < 1 || 5745 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5746 return false; 5747 5748 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5749 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5750 ArgType = RT->getPointeeType().getUnqualifiedType(); 5751 5752 return isStdInitializerList(ArgType, 0); 5753} 5754 5755/// \brief Determine whether a using statement is in a context where it will be 5756/// apply in all contexts. 5757static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5758 switch (CurContext->getDeclKind()) { 5759 case Decl::TranslationUnit: 5760 return true; 5761 case Decl::LinkageSpec: 5762 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5763 default: 5764 return false; 5765 } 5766} 5767 5768namespace { 5769 5770// Callback to only accept typo corrections that are namespaces. 5771class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5772 public: 5773 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5774 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5775 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5776 } 5777 return false; 5778 } 5779}; 5780 5781} 5782 5783static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5784 CXXScopeSpec &SS, 5785 SourceLocation IdentLoc, 5786 IdentifierInfo *Ident) { 5787 NamespaceValidatorCCC Validator; 5788 R.clear(); 5789 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5790 R.getLookupKind(), Sc, &SS, 5791 Validator)) { 5792 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5793 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5794 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5795 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5796 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5797 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5798 else 5799 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5800 << Ident << CorrectedQuotedStr 5801 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5802 5803 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5804 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5805 5806 R.addDecl(Corrected.getCorrectionDecl()); 5807 return true; 5808 } 5809 return false; 5810} 5811 5812Decl *Sema::ActOnUsingDirective(Scope *S, 5813 SourceLocation UsingLoc, 5814 SourceLocation NamespcLoc, 5815 CXXScopeSpec &SS, 5816 SourceLocation IdentLoc, 5817 IdentifierInfo *NamespcName, 5818 AttributeList *AttrList) { 5819 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5820 assert(NamespcName && "Invalid NamespcName."); 5821 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5822 5823 // This can only happen along a recovery path. 5824 while (S->getFlags() & Scope::TemplateParamScope) 5825 S = S->getParent(); 5826 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5827 5828 UsingDirectiveDecl *UDir = 0; 5829 NestedNameSpecifier *Qualifier = 0; 5830 if (SS.isSet()) 5831 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5832 5833 // Lookup namespace name. 5834 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5835 LookupParsedName(R, S, &SS); 5836 if (R.isAmbiguous()) 5837 return 0; 5838 5839 if (R.empty()) { 5840 R.clear(); 5841 // Allow "using namespace std;" or "using namespace ::std;" even if 5842 // "std" hasn't been defined yet, for GCC compatibility. 5843 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5844 NamespcName->isStr("std")) { 5845 Diag(IdentLoc, diag::ext_using_undefined_std); 5846 R.addDecl(getOrCreateStdNamespace()); 5847 R.resolveKind(); 5848 } 5849 // Otherwise, attempt typo correction. 5850 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5851 } 5852 5853 if (!R.empty()) { 5854 NamedDecl *Named = R.getFoundDecl(); 5855 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5856 && "expected namespace decl"); 5857 // C++ [namespace.udir]p1: 5858 // A using-directive specifies that the names in the nominated 5859 // namespace can be used in the scope in which the 5860 // using-directive appears after the using-directive. During 5861 // unqualified name lookup (3.4.1), the names appear as if they 5862 // were declared in the nearest enclosing namespace which 5863 // contains both the using-directive and the nominated 5864 // namespace. [Note: in this context, "contains" means "contains 5865 // directly or indirectly". ] 5866 5867 // Find enclosing context containing both using-directive and 5868 // nominated namespace. 5869 NamespaceDecl *NS = getNamespaceDecl(Named); 5870 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5871 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5872 CommonAncestor = CommonAncestor->getParent(); 5873 5874 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5875 SS.getWithLocInContext(Context), 5876 IdentLoc, Named, CommonAncestor); 5877 5878 if (IsUsingDirectiveInToplevelContext(CurContext) && 5879 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5880 Diag(IdentLoc, diag::warn_using_directive_in_header); 5881 } 5882 5883 PushUsingDirective(S, UDir); 5884 } else { 5885 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5886 } 5887 5888 // FIXME: We ignore attributes for now. 5889 return UDir; 5890} 5891 5892void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5893 // If the scope has an associated entity and the using directive is at 5894 // namespace or translation unit scope, add the UsingDirectiveDecl into 5895 // its lookup structure so qualified name lookup can find it. 5896 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5897 if (Ctx && !Ctx->isFunctionOrMethod()) 5898 Ctx->addDecl(UDir); 5899 else 5900 // Otherwise, it is at block sope. The using-directives will affect lookup 5901 // only to the end of the scope. 5902 S->PushUsingDirective(UDir); 5903} 5904 5905 5906Decl *Sema::ActOnUsingDeclaration(Scope *S, 5907 AccessSpecifier AS, 5908 bool HasUsingKeyword, 5909 SourceLocation UsingLoc, 5910 CXXScopeSpec &SS, 5911 UnqualifiedId &Name, 5912 AttributeList *AttrList, 5913 bool IsTypeName, 5914 SourceLocation TypenameLoc) { 5915 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5916 5917 switch (Name.getKind()) { 5918 case UnqualifiedId::IK_ImplicitSelfParam: 5919 case UnqualifiedId::IK_Identifier: 5920 case UnqualifiedId::IK_OperatorFunctionId: 5921 case UnqualifiedId::IK_LiteralOperatorId: 5922 case UnqualifiedId::IK_ConversionFunctionId: 5923 break; 5924 5925 case UnqualifiedId::IK_ConstructorName: 5926 case UnqualifiedId::IK_ConstructorTemplateId: 5927 // C++11 inheriting constructors. 5928 Diag(Name.getLocStart(), 5929 getLangOpts().CPlusPlus0x ? 5930 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 5931 // instead once inheriting constructors work. 5932 diag::err_using_decl_constructor_unsupported : 5933 diag::err_using_decl_constructor) 5934 << SS.getRange(); 5935 5936 if (getLangOpts().CPlusPlus0x) break; 5937 5938 return 0; 5939 5940 case UnqualifiedId::IK_DestructorName: 5941 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5942 << SS.getRange(); 5943 return 0; 5944 5945 case UnqualifiedId::IK_TemplateId: 5946 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5947 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5948 return 0; 5949 } 5950 5951 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5952 DeclarationName TargetName = TargetNameInfo.getName(); 5953 if (!TargetName) 5954 return 0; 5955 5956 // Warn about using declarations. 5957 // TODO: store that the declaration was written without 'using' and 5958 // talk about access decls instead of using decls in the 5959 // diagnostics. 5960 if (!HasUsingKeyword) { 5961 UsingLoc = Name.getLocStart(); 5962 5963 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5964 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5965 } 5966 5967 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5968 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5969 return 0; 5970 5971 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5972 TargetNameInfo, AttrList, 5973 /* IsInstantiation */ false, 5974 IsTypeName, TypenameLoc); 5975 if (UD) 5976 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5977 5978 return UD; 5979} 5980 5981/// \brief Determine whether a using declaration considers the given 5982/// declarations as "equivalent", e.g., if they are redeclarations of 5983/// the same entity or are both typedefs of the same type. 5984static bool 5985IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5986 bool &SuppressRedeclaration) { 5987 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5988 SuppressRedeclaration = false; 5989 return true; 5990 } 5991 5992 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5993 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5994 SuppressRedeclaration = true; 5995 return Context.hasSameType(TD1->getUnderlyingType(), 5996 TD2->getUnderlyingType()); 5997 } 5998 5999 return false; 6000} 6001 6002 6003/// Determines whether to create a using shadow decl for a particular 6004/// decl, given the set of decls existing prior to this using lookup. 6005bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6006 const LookupResult &Previous) { 6007 // Diagnose finding a decl which is not from a base class of the 6008 // current class. We do this now because there are cases where this 6009 // function will silently decide not to build a shadow decl, which 6010 // will pre-empt further diagnostics. 6011 // 6012 // We don't need to do this in C++0x because we do the check once on 6013 // the qualifier. 6014 // 6015 // FIXME: diagnose the following if we care enough: 6016 // struct A { int foo; }; 6017 // struct B : A { using A::foo; }; 6018 // template <class T> struct C : A {}; 6019 // template <class T> struct D : C<T> { using B::foo; } // <--- 6020 // This is invalid (during instantiation) in C++03 because B::foo 6021 // resolves to the using decl in B, which is not a base class of D<T>. 6022 // We can't diagnose it immediately because C<T> is an unknown 6023 // specialization. The UsingShadowDecl in D<T> then points directly 6024 // to A::foo, which will look well-formed when we instantiate. 6025 // The right solution is to not collapse the shadow-decl chain. 6026 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 6027 DeclContext *OrigDC = Orig->getDeclContext(); 6028 6029 // Handle enums and anonymous structs. 6030 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6031 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6032 while (OrigRec->isAnonymousStructOrUnion()) 6033 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6034 6035 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6036 if (OrigDC == CurContext) { 6037 Diag(Using->getLocation(), 6038 diag::err_using_decl_nested_name_specifier_is_current_class) 6039 << Using->getQualifierLoc().getSourceRange(); 6040 Diag(Orig->getLocation(), diag::note_using_decl_target); 6041 return true; 6042 } 6043 6044 Diag(Using->getQualifierLoc().getBeginLoc(), 6045 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6046 << Using->getQualifier() 6047 << cast<CXXRecordDecl>(CurContext) 6048 << Using->getQualifierLoc().getSourceRange(); 6049 Diag(Orig->getLocation(), diag::note_using_decl_target); 6050 return true; 6051 } 6052 } 6053 6054 if (Previous.empty()) return false; 6055 6056 NamedDecl *Target = Orig; 6057 if (isa<UsingShadowDecl>(Target)) 6058 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6059 6060 // If the target happens to be one of the previous declarations, we 6061 // don't have a conflict. 6062 // 6063 // FIXME: but we might be increasing its access, in which case we 6064 // should redeclare it. 6065 NamedDecl *NonTag = 0, *Tag = 0; 6066 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6067 I != E; ++I) { 6068 NamedDecl *D = (*I)->getUnderlyingDecl(); 6069 bool Result; 6070 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6071 return Result; 6072 6073 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6074 } 6075 6076 if (Target->isFunctionOrFunctionTemplate()) { 6077 FunctionDecl *FD; 6078 if (isa<FunctionTemplateDecl>(Target)) 6079 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6080 else 6081 FD = cast<FunctionDecl>(Target); 6082 6083 NamedDecl *OldDecl = 0; 6084 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6085 case Ovl_Overload: 6086 return false; 6087 6088 case Ovl_NonFunction: 6089 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6090 break; 6091 6092 // We found a decl with the exact signature. 6093 case Ovl_Match: 6094 // If we're in a record, we want to hide the target, so we 6095 // return true (without a diagnostic) to tell the caller not to 6096 // build a shadow decl. 6097 if (CurContext->isRecord()) 6098 return true; 6099 6100 // If we're not in a record, this is an error. 6101 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6102 break; 6103 } 6104 6105 Diag(Target->getLocation(), diag::note_using_decl_target); 6106 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6107 return true; 6108 } 6109 6110 // Target is not a function. 6111 6112 if (isa<TagDecl>(Target)) { 6113 // No conflict between a tag and a non-tag. 6114 if (!Tag) return false; 6115 6116 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6117 Diag(Target->getLocation(), diag::note_using_decl_target); 6118 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6119 return true; 6120 } 6121 6122 // No conflict between a tag and a non-tag. 6123 if (!NonTag) return false; 6124 6125 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6126 Diag(Target->getLocation(), diag::note_using_decl_target); 6127 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6128 return true; 6129} 6130 6131/// Builds a shadow declaration corresponding to a 'using' declaration. 6132UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6133 UsingDecl *UD, 6134 NamedDecl *Orig) { 6135 6136 // If we resolved to another shadow declaration, just coalesce them. 6137 NamedDecl *Target = Orig; 6138 if (isa<UsingShadowDecl>(Target)) { 6139 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6140 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6141 } 6142 6143 UsingShadowDecl *Shadow 6144 = UsingShadowDecl::Create(Context, CurContext, 6145 UD->getLocation(), UD, Target); 6146 UD->addShadowDecl(Shadow); 6147 6148 Shadow->setAccess(UD->getAccess()); 6149 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6150 Shadow->setInvalidDecl(); 6151 6152 if (S) 6153 PushOnScopeChains(Shadow, S); 6154 else 6155 CurContext->addDecl(Shadow); 6156 6157 6158 return Shadow; 6159} 6160 6161/// Hides a using shadow declaration. This is required by the current 6162/// using-decl implementation when a resolvable using declaration in a 6163/// class is followed by a declaration which would hide or override 6164/// one or more of the using decl's targets; for example: 6165/// 6166/// struct Base { void foo(int); }; 6167/// struct Derived : Base { 6168/// using Base::foo; 6169/// void foo(int); 6170/// }; 6171/// 6172/// The governing language is C++03 [namespace.udecl]p12: 6173/// 6174/// When a using-declaration brings names from a base class into a 6175/// derived class scope, member functions in the derived class 6176/// override and/or hide member functions with the same name and 6177/// parameter types in a base class (rather than conflicting). 6178/// 6179/// There are two ways to implement this: 6180/// (1) optimistically create shadow decls when they're not hidden 6181/// by existing declarations, or 6182/// (2) don't create any shadow decls (or at least don't make them 6183/// visible) until we've fully parsed/instantiated the class. 6184/// The problem with (1) is that we might have to retroactively remove 6185/// a shadow decl, which requires several O(n) operations because the 6186/// decl structures are (very reasonably) not designed for removal. 6187/// (2) avoids this but is very fiddly and phase-dependent. 6188void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6189 if (Shadow->getDeclName().getNameKind() == 6190 DeclarationName::CXXConversionFunctionName) 6191 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6192 6193 // Remove it from the DeclContext... 6194 Shadow->getDeclContext()->removeDecl(Shadow); 6195 6196 // ...and the scope, if applicable... 6197 if (S) { 6198 S->RemoveDecl(Shadow); 6199 IdResolver.RemoveDecl(Shadow); 6200 } 6201 6202 // ...and the using decl. 6203 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6204 6205 // TODO: complain somehow if Shadow was used. It shouldn't 6206 // be possible for this to happen, because...? 6207} 6208 6209/// Builds a using declaration. 6210/// 6211/// \param IsInstantiation - Whether this call arises from an 6212/// instantiation of an unresolved using declaration. We treat 6213/// the lookup differently for these declarations. 6214NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6215 SourceLocation UsingLoc, 6216 CXXScopeSpec &SS, 6217 const DeclarationNameInfo &NameInfo, 6218 AttributeList *AttrList, 6219 bool IsInstantiation, 6220 bool IsTypeName, 6221 SourceLocation TypenameLoc) { 6222 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6223 SourceLocation IdentLoc = NameInfo.getLoc(); 6224 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6225 6226 // FIXME: We ignore attributes for now. 6227 6228 if (SS.isEmpty()) { 6229 Diag(IdentLoc, diag::err_using_requires_qualname); 6230 return 0; 6231 } 6232 6233 // Do the redeclaration lookup in the current scope. 6234 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6235 ForRedeclaration); 6236 Previous.setHideTags(false); 6237 if (S) { 6238 LookupName(Previous, S); 6239 6240 // It is really dumb that we have to do this. 6241 LookupResult::Filter F = Previous.makeFilter(); 6242 while (F.hasNext()) { 6243 NamedDecl *D = F.next(); 6244 if (!isDeclInScope(D, CurContext, S)) 6245 F.erase(); 6246 } 6247 F.done(); 6248 } else { 6249 assert(IsInstantiation && "no scope in non-instantiation"); 6250 assert(CurContext->isRecord() && "scope not record in instantiation"); 6251 LookupQualifiedName(Previous, CurContext); 6252 } 6253 6254 // Check for invalid redeclarations. 6255 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6256 return 0; 6257 6258 // Check for bad qualifiers. 6259 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6260 return 0; 6261 6262 DeclContext *LookupContext = computeDeclContext(SS); 6263 NamedDecl *D; 6264 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6265 if (!LookupContext) { 6266 if (IsTypeName) { 6267 // FIXME: not all declaration name kinds are legal here 6268 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6269 UsingLoc, TypenameLoc, 6270 QualifierLoc, 6271 IdentLoc, NameInfo.getName()); 6272 } else { 6273 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6274 QualifierLoc, NameInfo); 6275 } 6276 } else { 6277 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6278 NameInfo, IsTypeName); 6279 } 6280 D->setAccess(AS); 6281 CurContext->addDecl(D); 6282 6283 if (!LookupContext) return D; 6284 UsingDecl *UD = cast<UsingDecl>(D); 6285 6286 if (RequireCompleteDeclContext(SS, LookupContext)) { 6287 UD->setInvalidDecl(); 6288 return UD; 6289 } 6290 6291 // The normal rules do not apply to inheriting constructor declarations. 6292 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6293 if (CheckInheritingConstructorUsingDecl(UD)) 6294 UD->setInvalidDecl(); 6295 return UD; 6296 } 6297 6298 // Otherwise, look up the target name. 6299 6300 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6301 6302 // Unlike most lookups, we don't always want to hide tag 6303 // declarations: tag names are visible through the using declaration 6304 // even if hidden by ordinary names, *except* in a dependent context 6305 // where it's important for the sanity of two-phase lookup. 6306 if (!IsInstantiation) 6307 R.setHideTags(false); 6308 6309 // For the purposes of this lookup, we have a base object type 6310 // equal to that of the current context. 6311 if (CurContext->isRecord()) { 6312 R.setBaseObjectType( 6313 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6314 } 6315 6316 LookupQualifiedName(R, LookupContext); 6317 6318 if (R.empty()) { 6319 Diag(IdentLoc, diag::err_no_member) 6320 << NameInfo.getName() << LookupContext << SS.getRange(); 6321 UD->setInvalidDecl(); 6322 return UD; 6323 } 6324 6325 if (R.isAmbiguous()) { 6326 UD->setInvalidDecl(); 6327 return UD; 6328 } 6329 6330 if (IsTypeName) { 6331 // If we asked for a typename and got a non-type decl, error out. 6332 if (!R.getAsSingle<TypeDecl>()) { 6333 Diag(IdentLoc, diag::err_using_typename_non_type); 6334 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6335 Diag((*I)->getUnderlyingDecl()->getLocation(), 6336 diag::note_using_decl_target); 6337 UD->setInvalidDecl(); 6338 return UD; 6339 } 6340 } else { 6341 // If we asked for a non-typename and we got a type, error out, 6342 // but only if this is an instantiation of an unresolved using 6343 // decl. Otherwise just silently find the type name. 6344 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6345 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6346 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6347 UD->setInvalidDecl(); 6348 return UD; 6349 } 6350 } 6351 6352 // C++0x N2914 [namespace.udecl]p6: 6353 // A using-declaration shall not name a namespace. 6354 if (R.getAsSingle<NamespaceDecl>()) { 6355 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6356 << SS.getRange(); 6357 UD->setInvalidDecl(); 6358 return UD; 6359 } 6360 6361 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6362 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6363 BuildUsingShadowDecl(S, UD, *I); 6364 } 6365 6366 return UD; 6367} 6368 6369/// Additional checks for a using declaration referring to a constructor name. 6370bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6371 assert(!UD->isTypeName() && "expecting a constructor name"); 6372 6373 const Type *SourceType = UD->getQualifier()->getAsType(); 6374 assert(SourceType && 6375 "Using decl naming constructor doesn't have type in scope spec."); 6376 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6377 6378 // Check whether the named type is a direct base class. 6379 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6380 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6381 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6382 BaseIt != BaseE; ++BaseIt) { 6383 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6384 if (CanonicalSourceType == BaseType) 6385 break; 6386 if (BaseIt->getType()->isDependentType()) 6387 break; 6388 } 6389 6390 if (BaseIt == BaseE) { 6391 // Did not find SourceType in the bases. 6392 Diag(UD->getUsingLocation(), 6393 diag::err_using_decl_constructor_not_in_direct_base) 6394 << UD->getNameInfo().getSourceRange() 6395 << QualType(SourceType, 0) << TargetClass; 6396 return true; 6397 } 6398 6399 if (!CurContext->isDependentContext()) 6400 BaseIt->setInheritConstructors(); 6401 6402 return false; 6403} 6404 6405/// Checks that the given using declaration is not an invalid 6406/// redeclaration. Note that this is checking only for the using decl 6407/// itself, not for any ill-formedness among the UsingShadowDecls. 6408bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6409 bool isTypeName, 6410 const CXXScopeSpec &SS, 6411 SourceLocation NameLoc, 6412 const LookupResult &Prev) { 6413 // C++03 [namespace.udecl]p8: 6414 // C++0x [namespace.udecl]p10: 6415 // A using-declaration is a declaration and can therefore be used 6416 // repeatedly where (and only where) multiple declarations are 6417 // allowed. 6418 // 6419 // That's in non-member contexts. 6420 if (!CurContext->getRedeclContext()->isRecord()) 6421 return false; 6422 6423 NestedNameSpecifier *Qual 6424 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6425 6426 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6427 NamedDecl *D = *I; 6428 6429 bool DTypename; 6430 NestedNameSpecifier *DQual; 6431 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6432 DTypename = UD->isTypeName(); 6433 DQual = UD->getQualifier(); 6434 } else if (UnresolvedUsingValueDecl *UD 6435 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6436 DTypename = false; 6437 DQual = UD->getQualifier(); 6438 } else if (UnresolvedUsingTypenameDecl *UD 6439 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6440 DTypename = true; 6441 DQual = UD->getQualifier(); 6442 } else continue; 6443 6444 // using decls differ if one says 'typename' and the other doesn't. 6445 // FIXME: non-dependent using decls? 6446 if (isTypeName != DTypename) continue; 6447 6448 // using decls differ if they name different scopes (but note that 6449 // template instantiation can cause this check to trigger when it 6450 // didn't before instantiation). 6451 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6452 Context.getCanonicalNestedNameSpecifier(DQual)) 6453 continue; 6454 6455 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6456 Diag(D->getLocation(), diag::note_using_decl) << 1; 6457 return true; 6458 } 6459 6460 return false; 6461} 6462 6463 6464/// Checks that the given nested-name qualifier used in a using decl 6465/// in the current context is appropriately related to the current 6466/// scope. If an error is found, diagnoses it and returns true. 6467bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6468 const CXXScopeSpec &SS, 6469 SourceLocation NameLoc) { 6470 DeclContext *NamedContext = computeDeclContext(SS); 6471 6472 if (!CurContext->isRecord()) { 6473 // C++03 [namespace.udecl]p3: 6474 // C++0x [namespace.udecl]p8: 6475 // A using-declaration for a class member shall be a member-declaration. 6476 6477 // If we weren't able to compute a valid scope, it must be a 6478 // dependent class scope. 6479 if (!NamedContext || NamedContext->isRecord()) { 6480 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6481 << SS.getRange(); 6482 return true; 6483 } 6484 6485 // Otherwise, everything is known to be fine. 6486 return false; 6487 } 6488 6489 // The current scope is a record. 6490 6491 // If the named context is dependent, we can't decide much. 6492 if (!NamedContext) { 6493 // FIXME: in C++0x, we can diagnose if we can prove that the 6494 // nested-name-specifier does not refer to a base class, which is 6495 // still possible in some cases. 6496 6497 // Otherwise we have to conservatively report that things might be 6498 // okay. 6499 return false; 6500 } 6501 6502 if (!NamedContext->isRecord()) { 6503 // Ideally this would point at the last name in the specifier, 6504 // but we don't have that level of source info. 6505 Diag(SS.getRange().getBegin(), 6506 diag::err_using_decl_nested_name_specifier_is_not_class) 6507 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6508 return true; 6509 } 6510 6511 if (!NamedContext->isDependentContext() && 6512 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6513 return true; 6514 6515 if (getLangOpts().CPlusPlus0x) { 6516 // C++0x [namespace.udecl]p3: 6517 // In a using-declaration used as a member-declaration, the 6518 // nested-name-specifier shall name a base class of the class 6519 // being defined. 6520 6521 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6522 cast<CXXRecordDecl>(NamedContext))) { 6523 if (CurContext == NamedContext) { 6524 Diag(NameLoc, 6525 diag::err_using_decl_nested_name_specifier_is_current_class) 6526 << SS.getRange(); 6527 return true; 6528 } 6529 6530 Diag(SS.getRange().getBegin(), 6531 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6532 << (NestedNameSpecifier*) SS.getScopeRep() 6533 << cast<CXXRecordDecl>(CurContext) 6534 << SS.getRange(); 6535 return true; 6536 } 6537 6538 return false; 6539 } 6540 6541 // C++03 [namespace.udecl]p4: 6542 // A using-declaration used as a member-declaration shall refer 6543 // to a member of a base class of the class being defined [etc.]. 6544 6545 // Salient point: SS doesn't have to name a base class as long as 6546 // lookup only finds members from base classes. Therefore we can 6547 // diagnose here only if we can prove that that can't happen, 6548 // i.e. if the class hierarchies provably don't intersect. 6549 6550 // TODO: it would be nice if "definitely valid" results were cached 6551 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6552 // need to be repeated. 6553 6554 struct UserData { 6555 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6556 6557 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6558 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6559 Data->Bases.insert(Base); 6560 return true; 6561 } 6562 6563 bool hasDependentBases(const CXXRecordDecl *Class) { 6564 return !Class->forallBases(collect, this); 6565 } 6566 6567 /// Returns true if the base is dependent or is one of the 6568 /// accumulated base classes. 6569 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6570 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6571 return !Data->Bases.count(Base); 6572 } 6573 6574 bool mightShareBases(const CXXRecordDecl *Class) { 6575 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6576 } 6577 }; 6578 6579 UserData Data; 6580 6581 // Returns false if we find a dependent base. 6582 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6583 return false; 6584 6585 // Returns false if the class has a dependent base or if it or one 6586 // of its bases is present in the base set of the current context. 6587 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6588 return false; 6589 6590 Diag(SS.getRange().getBegin(), 6591 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6592 << (NestedNameSpecifier*) SS.getScopeRep() 6593 << cast<CXXRecordDecl>(CurContext) 6594 << SS.getRange(); 6595 6596 return true; 6597} 6598 6599Decl *Sema::ActOnAliasDeclaration(Scope *S, 6600 AccessSpecifier AS, 6601 MultiTemplateParamsArg TemplateParamLists, 6602 SourceLocation UsingLoc, 6603 UnqualifiedId &Name, 6604 TypeResult Type) { 6605 // Skip up to the relevant declaration scope. 6606 while (S->getFlags() & Scope::TemplateParamScope) 6607 S = S->getParent(); 6608 assert((S->getFlags() & Scope::DeclScope) && 6609 "got alias-declaration outside of declaration scope"); 6610 6611 if (Type.isInvalid()) 6612 return 0; 6613 6614 bool Invalid = false; 6615 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6616 TypeSourceInfo *TInfo = 0; 6617 GetTypeFromParser(Type.get(), &TInfo); 6618 6619 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6620 return 0; 6621 6622 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6623 UPPC_DeclarationType)) { 6624 Invalid = true; 6625 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6626 TInfo->getTypeLoc().getBeginLoc()); 6627 } 6628 6629 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6630 LookupName(Previous, S); 6631 6632 // Warn about shadowing the name of a template parameter. 6633 if (Previous.isSingleResult() && 6634 Previous.getFoundDecl()->isTemplateParameter()) { 6635 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6636 Previous.clear(); 6637 } 6638 6639 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6640 "name in alias declaration must be an identifier"); 6641 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6642 Name.StartLocation, 6643 Name.Identifier, TInfo); 6644 6645 NewTD->setAccess(AS); 6646 6647 if (Invalid) 6648 NewTD->setInvalidDecl(); 6649 6650 CheckTypedefForVariablyModifiedType(S, NewTD); 6651 Invalid |= NewTD->isInvalidDecl(); 6652 6653 bool Redeclaration = false; 6654 6655 NamedDecl *NewND; 6656 if (TemplateParamLists.size()) { 6657 TypeAliasTemplateDecl *OldDecl = 0; 6658 TemplateParameterList *OldTemplateParams = 0; 6659 6660 if (TemplateParamLists.size() != 1) { 6661 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6662 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6663 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6664 } 6665 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6666 6667 // Only consider previous declarations in the same scope. 6668 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6669 /*ExplicitInstantiationOrSpecialization*/false); 6670 if (!Previous.empty()) { 6671 Redeclaration = true; 6672 6673 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6674 if (!OldDecl && !Invalid) { 6675 Diag(UsingLoc, diag::err_redefinition_different_kind) 6676 << Name.Identifier; 6677 6678 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6679 if (OldD->getLocation().isValid()) 6680 Diag(OldD->getLocation(), diag::note_previous_definition); 6681 6682 Invalid = true; 6683 } 6684 6685 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6686 if (TemplateParameterListsAreEqual(TemplateParams, 6687 OldDecl->getTemplateParameters(), 6688 /*Complain=*/true, 6689 TPL_TemplateMatch)) 6690 OldTemplateParams = OldDecl->getTemplateParameters(); 6691 else 6692 Invalid = true; 6693 6694 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6695 if (!Invalid && 6696 !Context.hasSameType(OldTD->getUnderlyingType(), 6697 NewTD->getUnderlyingType())) { 6698 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6699 // but we can't reasonably accept it. 6700 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6701 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6702 if (OldTD->getLocation().isValid()) 6703 Diag(OldTD->getLocation(), diag::note_previous_definition); 6704 Invalid = true; 6705 } 6706 } 6707 } 6708 6709 // Merge any previous default template arguments into our parameters, 6710 // and check the parameter list. 6711 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6712 TPC_TypeAliasTemplate)) 6713 return 0; 6714 6715 TypeAliasTemplateDecl *NewDecl = 6716 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6717 Name.Identifier, TemplateParams, 6718 NewTD); 6719 6720 NewDecl->setAccess(AS); 6721 6722 if (Invalid) 6723 NewDecl->setInvalidDecl(); 6724 else if (OldDecl) 6725 NewDecl->setPreviousDeclaration(OldDecl); 6726 6727 NewND = NewDecl; 6728 } else { 6729 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6730 NewND = NewTD; 6731 } 6732 6733 if (!Redeclaration) 6734 PushOnScopeChains(NewND, S); 6735 6736 return NewND; 6737} 6738 6739Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6740 SourceLocation NamespaceLoc, 6741 SourceLocation AliasLoc, 6742 IdentifierInfo *Alias, 6743 CXXScopeSpec &SS, 6744 SourceLocation IdentLoc, 6745 IdentifierInfo *Ident) { 6746 6747 // Lookup the namespace name. 6748 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6749 LookupParsedName(R, S, &SS); 6750 6751 // Check if we have a previous declaration with the same name. 6752 NamedDecl *PrevDecl 6753 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6754 ForRedeclaration); 6755 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6756 PrevDecl = 0; 6757 6758 if (PrevDecl) { 6759 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6760 // We already have an alias with the same name that points to the same 6761 // namespace, so don't create a new one. 6762 // FIXME: At some point, we'll want to create the (redundant) 6763 // declaration to maintain better source information. 6764 if (!R.isAmbiguous() && !R.empty() && 6765 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6766 return 0; 6767 } 6768 6769 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6770 diag::err_redefinition_different_kind; 6771 Diag(AliasLoc, DiagID) << Alias; 6772 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6773 return 0; 6774 } 6775 6776 if (R.isAmbiguous()) 6777 return 0; 6778 6779 if (R.empty()) { 6780 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6781 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6782 return 0; 6783 } 6784 } 6785 6786 NamespaceAliasDecl *AliasDecl = 6787 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6788 Alias, SS.getWithLocInContext(Context), 6789 IdentLoc, R.getFoundDecl()); 6790 6791 PushOnScopeChains(AliasDecl, S); 6792 return AliasDecl; 6793} 6794 6795namespace { 6796 /// \brief Scoped object used to handle the state changes required in Sema 6797 /// to implicitly define the body of a C++ member function; 6798 class ImplicitlyDefinedFunctionScope { 6799 Sema &S; 6800 Sema::ContextRAII SavedContext; 6801 6802 public: 6803 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6804 : S(S), SavedContext(S, Method) 6805 { 6806 S.PushFunctionScope(); 6807 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6808 } 6809 6810 ~ImplicitlyDefinedFunctionScope() { 6811 S.PopExpressionEvaluationContext(); 6812 S.PopFunctionScopeInfo(); 6813 } 6814 }; 6815} 6816 6817Sema::ImplicitExceptionSpecification 6818Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6819 // C++ [except.spec]p14: 6820 // An implicitly declared special member function (Clause 12) shall have an 6821 // exception-specification. [...] 6822 ImplicitExceptionSpecification ExceptSpec(*this); 6823 if (ClassDecl->isInvalidDecl()) 6824 return ExceptSpec; 6825 6826 // Direct base-class constructors. 6827 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6828 BEnd = ClassDecl->bases_end(); 6829 B != BEnd; ++B) { 6830 if (B->isVirtual()) // Handled below. 6831 continue; 6832 6833 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6834 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6835 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6836 // If this is a deleted function, add it anyway. This might be conformant 6837 // with the standard. This might not. I'm not sure. It might not matter. 6838 if (Constructor) 6839 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6840 } 6841 } 6842 6843 // Virtual base-class constructors. 6844 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6845 BEnd = ClassDecl->vbases_end(); 6846 B != BEnd; ++B) { 6847 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6848 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6849 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6850 // If this is a deleted function, add it anyway. This might be conformant 6851 // with the standard. This might not. I'm not sure. It might not matter. 6852 if (Constructor) 6853 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6854 } 6855 } 6856 6857 // Field constructors. 6858 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6859 FEnd = ClassDecl->field_end(); 6860 F != FEnd; ++F) { 6861 if (F->hasInClassInitializer()) { 6862 if (Expr *E = F->getInClassInitializer()) 6863 ExceptSpec.CalledExpr(E); 6864 else if (!F->isInvalidDecl()) 6865 ExceptSpec.SetDelayed(); 6866 } else if (const RecordType *RecordTy 6867 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6868 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6869 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6870 // If this is a deleted function, add it anyway. This might be conformant 6871 // with the standard. This might not. I'm not sure. It might not matter. 6872 // In particular, the problem is that this function never gets called. It 6873 // might just be ill-formed because this function attempts to refer to 6874 // a deleted function here. 6875 if (Constructor) 6876 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6877 } 6878 } 6879 6880 return ExceptSpec; 6881} 6882 6883CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6884 CXXRecordDecl *ClassDecl) { 6885 // C++ [class.ctor]p5: 6886 // A default constructor for a class X is a constructor of class X 6887 // that can be called without an argument. If there is no 6888 // user-declared constructor for class X, a default constructor is 6889 // implicitly declared. An implicitly-declared default constructor 6890 // is an inline public member of its class. 6891 assert(!ClassDecl->hasUserDeclaredConstructor() && 6892 "Should not build implicit default constructor!"); 6893 6894 ImplicitExceptionSpecification Spec = 6895 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6896 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6897 6898 // Create the actual constructor declaration. 6899 CanQualType ClassType 6900 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6901 SourceLocation ClassLoc = ClassDecl->getLocation(); 6902 DeclarationName Name 6903 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6904 DeclarationNameInfo NameInfo(Name, ClassLoc); 6905 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6906 Context, ClassDecl, ClassLoc, NameInfo, 6907 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6908 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6909 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 6910 getLangOpts().CPlusPlus0x); 6911 DefaultCon->setAccess(AS_public); 6912 DefaultCon->setDefaulted(); 6913 DefaultCon->setImplicit(); 6914 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6915 6916 // Note that we have declared this constructor. 6917 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6918 6919 if (Scope *S = getScopeForContext(ClassDecl)) 6920 PushOnScopeChains(DefaultCon, S, false); 6921 ClassDecl->addDecl(DefaultCon); 6922 6923 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6924 DefaultCon->setDeletedAsWritten(); 6925 6926 return DefaultCon; 6927} 6928 6929void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6930 CXXConstructorDecl *Constructor) { 6931 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6932 !Constructor->doesThisDeclarationHaveABody() && 6933 !Constructor->isDeleted()) && 6934 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6935 6936 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6937 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6938 6939 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6940 DiagnosticErrorTrap Trap(Diags); 6941 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6942 Trap.hasErrorOccurred()) { 6943 Diag(CurrentLocation, diag::note_member_synthesized_at) 6944 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6945 Constructor->setInvalidDecl(); 6946 return; 6947 } 6948 6949 SourceLocation Loc = Constructor->getLocation(); 6950 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6951 6952 Constructor->setUsed(); 6953 MarkVTableUsed(CurrentLocation, ClassDecl); 6954 6955 if (ASTMutationListener *L = getASTMutationListener()) { 6956 L->CompletedImplicitDefinition(Constructor); 6957 } 6958} 6959 6960/// Get any existing defaulted default constructor for the given class. Do not 6961/// implicitly define one if it does not exist. 6962static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6963 CXXRecordDecl *D) { 6964 ASTContext &Context = Self.Context; 6965 QualType ClassType = Context.getTypeDeclType(D); 6966 DeclarationName ConstructorName 6967 = Context.DeclarationNames.getCXXConstructorName( 6968 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6969 6970 DeclContext::lookup_const_iterator Con, ConEnd; 6971 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6972 Con != ConEnd; ++Con) { 6973 // A function template cannot be defaulted. 6974 if (isa<FunctionTemplateDecl>(*Con)) 6975 continue; 6976 6977 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6978 if (Constructor->isDefaultConstructor()) 6979 return Constructor->isDefaulted() ? Constructor : 0; 6980 } 6981 return 0; 6982} 6983 6984void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6985 if (!D) return; 6986 AdjustDeclIfTemplate(D); 6987 6988 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6989 CXXConstructorDecl *CtorDecl 6990 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6991 6992 if (!CtorDecl) return; 6993 6994 // Compute the exception specification for the default constructor. 6995 const FunctionProtoType *CtorTy = 6996 CtorDecl->getType()->castAs<FunctionProtoType>(); 6997 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6998 // FIXME: Don't do this unless the exception spec is needed. 6999 ImplicitExceptionSpecification Spec = 7000 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 7001 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7002 assert(EPI.ExceptionSpecType != EST_Delayed); 7003 7004 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7005 } 7006 7007 // If the default constructor is explicitly defaulted, checking the exception 7008 // specification is deferred until now. 7009 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 7010 !ClassDecl->isDependentType()) 7011 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 7012} 7013 7014void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7015 // We start with an initial pass over the base classes to collect those that 7016 // inherit constructors from. If there are none, we can forgo all further 7017 // processing. 7018 typedef SmallVector<const RecordType *, 4> BasesVector; 7019 BasesVector BasesToInheritFrom; 7020 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7021 BaseE = ClassDecl->bases_end(); 7022 BaseIt != BaseE; ++BaseIt) { 7023 if (BaseIt->getInheritConstructors()) { 7024 QualType Base = BaseIt->getType(); 7025 if (Base->isDependentType()) { 7026 // If we inherit constructors from anything that is dependent, just 7027 // abort processing altogether. We'll get another chance for the 7028 // instantiations. 7029 return; 7030 } 7031 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7032 } 7033 } 7034 if (BasesToInheritFrom.empty()) 7035 return; 7036 7037 // Now collect the constructors that we already have in the current class. 7038 // Those take precedence over inherited constructors. 7039 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7040 // unless there is a user-declared constructor with the same signature in 7041 // the class where the using-declaration appears. 7042 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7043 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7044 CtorE = ClassDecl->ctor_end(); 7045 CtorIt != CtorE; ++CtorIt) { 7046 ExistingConstructors.insert( 7047 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7048 } 7049 7050 DeclarationName CreatedCtorName = 7051 Context.DeclarationNames.getCXXConstructorName( 7052 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7053 7054 // Now comes the true work. 7055 // First, we keep a map from constructor types to the base that introduced 7056 // them. Needed for finding conflicting constructors. We also keep the 7057 // actually inserted declarations in there, for pretty diagnostics. 7058 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7059 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7060 ConstructorToSourceMap InheritedConstructors; 7061 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7062 BaseE = BasesToInheritFrom.end(); 7063 BaseIt != BaseE; ++BaseIt) { 7064 const RecordType *Base = *BaseIt; 7065 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7066 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7067 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7068 CtorE = BaseDecl->ctor_end(); 7069 CtorIt != CtorE; ++CtorIt) { 7070 // Find the using declaration for inheriting this base's constructors. 7071 // FIXME: Don't perform name lookup just to obtain a source location! 7072 DeclarationName Name = 7073 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7074 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 7075 LookupQualifiedName(Result, CurContext); 7076 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 7077 SourceLocation UsingLoc = UD ? UD->getLocation() : 7078 ClassDecl->getLocation(); 7079 7080 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7081 // from the class X named in the using-declaration consists of actual 7082 // constructors and notional constructors that result from the 7083 // transformation of defaulted parameters as follows: 7084 // - all non-template default constructors of X, and 7085 // - for each non-template constructor of X that has at least one 7086 // parameter with a default argument, the set of constructors that 7087 // results from omitting any ellipsis parameter specification and 7088 // successively omitting parameters with a default argument from the 7089 // end of the parameter-type-list. 7090 CXXConstructorDecl *BaseCtor = &*CtorIt; 7091 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7092 const FunctionProtoType *BaseCtorType = 7093 BaseCtor->getType()->getAs<FunctionProtoType>(); 7094 7095 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7096 maxParams = BaseCtor->getNumParams(); 7097 params <= maxParams; ++params) { 7098 // Skip default constructors. They're never inherited. 7099 if (params == 0) 7100 continue; 7101 // Skip copy and move constructors for the same reason. 7102 if (CanBeCopyOrMove && params == 1) 7103 continue; 7104 7105 // Build up a function type for this particular constructor. 7106 // FIXME: The working paper does not consider that the exception spec 7107 // for the inheriting constructor might be larger than that of the 7108 // source. This code doesn't yet, either. When it does, this code will 7109 // need to be delayed until after exception specifications and in-class 7110 // member initializers are attached. 7111 const Type *NewCtorType; 7112 if (params == maxParams) 7113 NewCtorType = BaseCtorType; 7114 else { 7115 SmallVector<QualType, 16> Args; 7116 for (unsigned i = 0; i < params; ++i) { 7117 Args.push_back(BaseCtorType->getArgType(i)); 7118 } 7119 FunctionProtoType::ExtProtoInfo ExtInfo = 7120 BaseCtorType->getExtProtoInfo(); 7121 ExtInfo.Variadic = false; 7122 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7123 Args.data(), params, ExtInfo) 7124 .getTypePtr(); 7125 } 7126 const Type *CanonicalNewCtorType = 7127 Context.getCanonicalType(NewCtorType); 7128 7129 // Now that we have the type, first check if the class already has a 7130 // constructor with this signature. 7131 if (ExistingConstructors.count(CanonicalNewCtorType)) 7132 continue; 7133 7134 // Then we check if we have already declared an inherited constructor 7135 // with this signature. 7136 std::pair<ConstructorToSourceMap::iterator, bool> result = 7137 InheritedConstructors.insert(std::make_pair( 7138 CanonicalNewCtorType, 7139 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7140 if (!result.second) { 7141 // Already in the map. If it came from a different class, that's an 7142 // error. Not if it's from the same. 7143 CanQualType PreviousBase = result.first->second.first; 7144 if (CanonicalBase != PreviousBase) { 7145 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7146 const CXXConstructorDecl *PrevBaseCtor = 7147 PrevCtor->getInheritedConstructor(); 7148 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7149 7150 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7151 Diag(BaseCtor->getLocation(), 7152 diag::note_using_decl_constructor_conflict_current_ctor); 7153 Diag(PrevBaseCtor->getLocation(), 7154 diag::note_using_decl_constructor_conflict_previous_ctor); 7155 Diag(PrevCtor->getLocation(), 7156 diag::note_using_decl_constructor_conflict_previous_using); 7157 } 7158 continue; 7159 } 7160 7161 // OK, we're there, now add the constructor. 7162 // C++0x [class.inhctor]p8: [...] that would be performed by a 7163 // user-written inline constructor [...] 7164 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7165 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7166 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7167 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7168 /*ImplicitlyDeclared=*/true, 7169 // FIXME: Due to a defect in the standard, we treat inherited 7170 // constructors as constexpr even if that makes them ill-formed. 7171 /*Constexpr=*/BaseCtor->isConstexpr()); 7172 NewCtor->setAccess(BaseCtor->getAccess()); 7173 7174 // Build up the parameter decls and add them. 7175 SmallVector<ParmVarDecl *, 16> ParamDecls; 7176 for (unsigned i = 0; i < params; ++i) { 7177 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7178 UsingLoc, UsingLoc, 7179 /*IdentifierInfo=*/0, 7180 BaseCtorType->getArgType(i), 7181 /*TInfo=*/0, SC_None, 7182 SC_None, /*DefaultArg=*/0)); 7183 } 7184 NewCtor->setParams(ParamDecls); 7185 NewCtor->setInheritedConstructor(BaseCtor); 7186 7187 ClassDecl->addDecl(NewCtor); 7188 result.first->second.second = NewCtor; 7189 } 7190 } 7191 } 7192} 7193 7194Sema::ImplicitExceptionSpecification 7195Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7196 // C++ [except.spec]p14: 7197 // An implicitly declared special member function (Clause 12) shall have 7198 // an exception-specification. 7199 ImplicitExceptionSpecification ExceptSpec(*this); 7200 if (ClassDecl->isInvalidDecl()) 7201 return ExceptSpec; 7202 7203 // Direct base-class destructors. 7204 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7205 BEnd = ClassDecl->bases_end(); 7206 B != BEnd; ++B) { 7207 if (B->isVirtual()) // Handled below. 7208 continue; 7209 7210 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7211 ExceptSpec.CalledDecl(B->getLocStart(), 7212 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7213 } 7214 7215 // Virtual base-class destructors. 7216 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7217 BEnd = ClassDecl->vbases_end(); 7218 B != BEnd; ++B) { 7219 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7220 ExceptSpec.CalledDecl(B->getLocStart(), 7221 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7222 } 7223 7224 // Field destructors. 7225 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7226 FEnd = ClassDecl->field_end(); 7227 F != FEnd; ++F) { 7228 if (const RecordType *RecordTy 7229 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7230 ExceptSpec.CalledDecl(F->getLocation(), 7231 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7232 } 7233 7234 return ExceptSpec; 7235} 7236 7237CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7238 // C++ [class.dtor]p2: 7239 // If a class has no user-declared destructor, a destructor is 7240 // declared implicitly. An implicitly-declared destructor is an 7241 // inline public member of its class. 7242 7243 ImplicitExceptionSpecification Spec = 7244 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7245 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7246 7247 // Create the actual destructor declaration. 7248 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7249 7250 CanQualType ClassType 7251 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7252 SourceLocation ClassLoc = ClassDecl->getLocation(); 7253 DeclarationName Name 7254 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7255 DeclarationNameInfo NameInfo(Name, ClassLoc); 7256 CXXDestructorDecl *Destructor 7257 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7258 /*isInline=*/true, 7259 /*isImplicitlyDeclared=*/true); 7260 Destructor->setAccess(AS_public); 7261 Destructor->setDefaulted(); 7262 Destructor->setImplicit(); 7263 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7264 7265 // Note that we have declared this destructor. 7266 ++ASTContext::NumImplicitDestructorsDeclared; 7267 7268 // Introduce this destructor into its scope. 7269 if (Scope *S = getScopeForContext(ClassDecl)) 7270 PushOnScopeChains(Destructor, S, false); 7271 ClassDecl->addDecl(Destructor); 7272 7273 // This could be uniqued if it ever proves significant. 7274 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7275 7276 AddOverriddenMethods(ClassDecl, Destructor); 7277 7278 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7279 Destructor->setDeletedAsWritten(); 7280 7281 return Destructor; 7282} 7283 7284void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7285 CXXDestructorDecl *Destructor) { 7286 assert((Destructor->isDefaulted() && 7287 !Destructor->doesThisDeclarationHaveABody() && 7288 !Destructor->isDeleted()) && 7289 "DefineImplicitDestructor - call it for implicit default dtor"); 7290 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7291 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7292 7293 if (Destructor->isInvalidDecl()) 7294 return; 7295 7296 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7297 7298 DiagnosticErrorTrap Trap(Diags); 7299 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7300 Destructor->getParent()); 7301 7302 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7303 Diag(CurrentLocation, diag::note_member_synthesized_at) 7304 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7305 7306 Destructor->setInvalidDecl(); 7307 return; 7308 } 7309 7310 SourceLocation Loc = Destructor->getLocation(); 7311 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7312 Destructor->setImplicitlyDefined(true); 7313 Destructor->setUsed(); 7314 MarkVTableUsed(CurrentLocation, ClassDecl); 7315 7316 if (ASTMutationListener *L = getASTMutationListener()) { 7317 L->CompletedImplicitDefinition(Destructor); 7318 } 7319} 7320 7321/// \brief Perform any semantic analysis which needs to be delayed until all 7322/// pending class member declarations have been parsed. 7323void Sema::ActOnFinishCXXMemberDecls() { 7324 // Now we have parsed all exception specifications, determine the implicit 7325 // exception specifications for destructors. 7326 for (unsigned i = 0, e = DelayedDestructorExceptionSpecs.size(); 7327 i != e; ++i) { 7328 CXXDestructorDecl *Dtor = DelayedDestructorExceptionSpecs[i]; 7329 AdjustDestructorExceptionSpec(Dtor->getParent(), Dtor, true); 7330 } 7331 DelayedDestructorExceptionSpecs.clear(); 7332 7333 // Perform any deferred checking of exception specifications for virtual 7334 // destructors. 7335 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7336 i != e; ++i) { 7337 const CXXDestructorDecl *Dtor = 7338 DelayedDestructorExceptionSpecChecks[i].first; 7339 assert(!Dtor->getParent()->isDependentType() && 7340 "Should not ever add destructors of templates into the list."); 7341 CheckOverridingFunctionExceptionSpec(Dtor, 7342 DelayedDestructorExceptionSpecChecks[i].second); 7343 } 7344 DelayedDestructorExceptionSpecChecks.clear(); 7345} 7346 7347void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7348 CXXDestructorDecl *destructor, 7349 bool WasDelayed) { 7350 // C++11 [class.dtor]p3: 7351 // A declaration of a destructor that does not have an exception- 7352 // specification is implicitly considered to have the same exception- 7353 // specification as an implicit declaration. 7354 const FunctionProtoType *dtorType = destructor->getType()-> 7355 getAs<FunctionProtoType>(); 7356 if (!WasDelayed && dtorType->hasExceptionSpec()) 7357 return; 7358 7359 ImplicitExceptionSpecification exceptSpec = 7360 ComputeDefaultedDtorExceptionSpec(classDecl); 7361 7362 // Replace the destructor's type, building off the existing one. Fortunately, 7363 // the only thing of interest in the destructor type is its extended info. 7364 // The return and arguments are fixed. 7365 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7366 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7367 epi.NumExceptions = exceptSpec.size(); 7368 epi.Exceptions = exceptSpec.data(); 7369 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7370 7371 destructor->setType(ty); 7372 7373 // If we can't compute the exception specification for this destructor yet 7374 // (because it depends on an exception specification which we have not parsed 7375 // yet), make a note that we need to try again when the class is complete. 7376 if (epi.ExceptionSpecType == EST_Delayed) { 7377 assert(!WasDelayed && "couldn't compute destructor exception spec"); 7378 DelayedDestructorExceptionSpecs.push_back(destructor); 7379 } 7380 7381 // FIXME: If the destructor has a body that could throw, and the newly created 7382 // spec doesn't allow exceptions, we should emit a warning, because this 7383 // change in behavior can break conforming C++03 programs at runtime. 7384 // However, we don't have a body yet, so it needs to be done somewhere else. 7385} 7386 7387/// \brief Builds a statement that copies/moves the given entity from \p From to 7388/// \c To. 7389/// 7390/// This routine is used to copy/move the members of a class with an 7391/// implicitly-declared copy/move assignment operator. When the entities being 7392/// copied are arrays, this routine builds for loops to copy them. 7393/// 7394/// \param S The Sema object used for type-checking. 7395/// 7396/// \param Loc The location where the implicit copy/move is being generated. 7397/// 7398/// \param T The type of the expressions being copied/moved. Both expressions 7399/// must have this type. 7400/// 7401/// \param To The expression we are copying/moving to. 7402/// 7403/// \param From The expression we are copying/moving from. 7404/// 7405/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7406/// Otherwise, it's a non-static member subobject. 7407/// 7408/// \param Copying Whether we're copying or moving. 7409/// 7410/// \param Depth Internal parameter recording the depth of the recursion. 7411/// 7412/// \returns A statement or a loop that copies the expressions. 7413static StmtResult 7414BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7415 Expr *To, Expr *From, 7416 bool CopyingBaseSubobject, bool Copying, 7417 unsigned Depth = 0) { 7418 // C++0x [class.copy]p28: 7419 // Each subobject is assigned in the manner appropriate to its type: 7420 // 7421 // - if the subobject is of class type, as if by a call to operator= with 7422 // the subobject as the object expression and the corresponding 7423 // subobject of x as a single function argument (as if by explicit 7424 // qualification; that is, ignoring any possible virtual overriding 7425 // functions in more derived classes); 7426 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7427 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7428 7429 // Look for operator=. 7430 DeclarationName Name 7431 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7432 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7433 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7434 7435 // Filter out any result that isn't a copy/move-assignment operator. 7436 LookupResult::Filter F = OpLookup.makeFilter(); 7437 while (F.hasNext()) { 7438 NamedDecl *D = F.next(); 7439 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7440 if (Method->isCopyAssignmentOperator() || 7441 (!Copying && Method->isMoveAssignmentOperator())) 7442 continue; 7443 7444 F.erase(); 7445 } 7446 F.done(); 7447 7448 // Suppress the protected check (C++ [class.protected]) for each of the 7449 // assignment operators we found. This strange dance is required when 7450 // we're assigning via a base classes's copy-assignment operator. To 7451 // ensure that we're getting the right base class subobject (without 7452 // ambiguities), we need to cast "this" to that subobject type; to 7453 // ensure that we don't go through the virtual call mechanism, we need 7454 // to qualify the operator= name with the base class (see below). However, 7455 // this means that if the base class has a protected copy assignment 7456 // operator, the protected member access check will fail. So, we 7457 // rewrite "protected" access to "public" access in this case, since we 7458 // know by construction that we're calling from a derived class. 7459 if (CopyingBaseSubobject) { 7460 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7461 L != LEnd; ++L) { 7462 if (L.getAccess() == AS_protected) 7463 L.setAccess(AS_public); 7464 } 7465 } 7466 7467 // Create the nested-name-specifier that will be used to qualify the 7468 // reference to operator=; this is required to suppress the virtual 7469 // call mechanism. 7470 CXXScopeSpec SS; 7471 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7472 SS.MakeTrivial(S.Context, 7473 NestedNameSpecifier::Create(S.Context, 0, false, 7474 CanonicalT), 7475 Loc); 7476 7477 // Create the reference to operator=. 7478 ExprResult OpEqualRef 7479 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7480 /*TemplateKWLoc=*/SourceLocation(), 7481 /*FirstQualifierInScope=*/0, 7482 OpLookup, 7483 /*TemplateArgs=*/0, 7484 /*SuppressQualifierCheck=*/true); 7485 if (OpEqualRef.isInvalid()) 7486 return StmtError(); 7487 7488 // Build the call to the assignment operator. 7489 7490 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7491 OpEqualRef.takeAs<Expr>(), 7492 Loc, &From, 1, Loc); 7493 if (Call.isInvalid()) 7494 return StmtError(); 7495 7496 return S.Owned(Call.takeAs<Stmt>()); 7497 } 7498 7499 // - if the subobject is of scalar type, the built-in assignment 7500 // operator is used. 7501 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7502 if (!ArrayTy) { 7503 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7504 if (Assignment.isInvalid()) 7505 return StmtError(); 7506 7507 return S.Owned(Assignment.takeAs<Stmt>()); 7508 } 7509 7510 // - if the subobject is an array, each element is assigned, in the 7511 // manner appropriate to the element type; 7512 7513 // Construct a loop over the array bounds, e.g., 7514 // 7515 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7516 // 7517 // that will copy each of the array elements. 7518 QualType SizeType = S.Context.getSizeType(); 7519 7520 // Create the iteration variable. 7521 IdentifierInfo *IterationVarName = 0; 7522 { 7523 SmallString<8> Str; 7524 llvm::raw_svector_ostream OS(Str); 7525 OS << "__i" << Depth; 7526 IterationVarName = &S.Context.Idents.get(OS.str()); 7527 } 7528 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7529 IterationVarName, SizeType, 7530 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7531 SC_None, SC_None); 7532 7533 // Initialize the iteration variable to zero. 7534 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7535 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7536 7537 // Create a reference to the iteration variable; we'll use this several 7538 // times throughout. 7539 Expr *IterationVarRef 7540 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7541 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7542 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7543 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7544 7545 // Create the DeclStmt that holds the iteration variable. 7546 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7547 7548 // Create the comparison against the array bound. 7549 llvm::APInt Upper 7550 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7551 Expr *Comparison 7552 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7553 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7554 BO_NE, S.Context.BoolTy, 7555 VK_RValue, OK_Ordinary, Loc); 7556 7557 // Create the pre-increment of the iteration variable. 7558 Expr *Increment 7559 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7560 VK_LValue, OK_Ordinary, Loc); 7561 7562 // Subscript the "from" and "to" expressions with the iteration variable. 7563 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7564 IterationVarRefRVal, 7565 Loc)); 7566 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7567 IterationVarRefRVal, 7568 Loc)); 7569 if (!Copying) // Cast to rvalue 7570 From = CastForMoving(S, From); 7571 7572 // Build the copy/move for an individual element of the array. 7573 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7574 To, From, CopyingBaseSubobject, 7575 Copying, Depth + 1); 7576 if (Copy.isInvalid()) 7577 return StmtError(); 7578 7579 // Construct the loop that copies all elements of this array. 7580 return S.ActOnForStmt(Loc, Loc, InitStmt, 7581 S.MakeFullExpr(Comparison), 7582 0, S.MakeFullExpr(Increment), 7583 Loc, Copy.take()); 7584} 7585 7586std::pair<Sema::ImplicitExceptionSpecification, bool> 7587Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7588 CXXRecordDecl *ClassDecl) { 7589 if (ClassDecl->isInvalidDecl()) 7590 return std::make_pair(ImplicitExceptionSpecification(*this), false); 7591 7592 // C++ [class.copy]p10: 7593 // If the class definition does not explicitly declare a copy 7594 // assignment operator, one is declared implicitly. 7595 // The implicitly-defined copy assignment operator for a class X 7596 // will have the form 7597 // 7598 // X& X::operator=(const X&) 7599 // 7600 // if 7601 bool HasConstCopyAssignment = true; 7602 7603 // -- each direct base class B of X has a copy assignment operator 7604 // whose parameter is of type const B&, const volatile B& or B, 7605 // and 7606 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7607 BaseEnd = ClassDecl->bases_end(); 7608 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7609 // We'll handle this below 7610 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7611 continue; 7612 7613 assert(!Base->getType()->isDependentType() && 7614 "Cannot generate implicit members for class with dependent bases."); 7615 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7616 HasConstCopyAssignment &= 7617 (bool)LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7618 false, 0); 7619 } 7620 7621 // In C++11, the above citation has "or virtual" added 7622 if (LangOpts.CPlusPlus0x) { 7623 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7624 BaseEnd = ClassDecl->vbases_end(); 7625 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7626 assert(!Base->getType()->isDependentType() && 7627 "Cannot generate implicit members for class with dependent bases."); 7628 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7629 HasConstCopyAssignment &= 7630 (bool)LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7631 false, 0); 7632 } 7633 } 7634 7635 // -- for all the nonstatic data members of X that are of a class 7636 // type M (or array thereof), each such class type has a copy 7637 // assignment operator whose parameter is of type const M&, 7638 // const volatile M& or M. 7639 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7640 FieldEnd = ClassDecl->field_end(); 7641 HasConstCopyAssignment && Field != FieldEnd; 7642 ++Field) { 7643 QualType FieldType = Context.getBaseElementType(Field->getType()); 7644 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7645 HasConstCopyAssignment &= 7646 (bool)LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7647 false, 0); 7648 } 7649 } 7650 7651 // Otherwise, the implicitly declared copy assignment operator will 7652 // have the form 7653 // 7654 // X& X::operator=(X&) 7655 7656 // C++ [except.spec]p14: 7657 // An implicitly declared special member function (Clause 12) shall have an 7658 // exception-specification. [...] 7659 7660 // It is unspecified whether or not an implicit copy assignment operator 7661 // attempts to deduplicate calls to assignment operators of virtual bases are 7662 // made. As such, this exception specification is effectively unspecified. 7663 // Based on a similar decision made for constness in C++0x, we're erring on 7664 // the side of assuming such calls to be made regardless of whether they 7665 // actually happen. 7666 ImplicitExceptionSpecification ExceptSpec(*this); 7667 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7668 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7669 BaseEnd = ClassDecl->bases_end(); 7670 Base != BaseEnd; ++Base) { 7671 if (Base->isVirtual()) 7672 continue; 7673 7674 CXXRecordDecl *BaseClassDecl 7675 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7676 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7677 ArgQuals, false, 0)) 7678 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7679 } 7680 7681 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7682 BaseEnd = ClassDecl->vbases_end(); 7683 Base != BaseEnd; ++Base) { 7684 CXXRecordDecl *BaseClassDecl 7685 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7686 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7687 ArgQuals, false, 0)) 7688 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7689 } 7690 7691 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7692 FieldEnd = ClassDecl->field_end(); 7693 Field != FieldEnd; 7694 ++Field) { 7695 QualType FieldType = Context.getBaseElementType(Field->getType()); 7696 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7697 if (CXXMethodDecl *CopyAssign = 7698 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7699 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7700 } 7701 } 7702 7703 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7704} 7705 7706CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7707 // Note: The following rules are largely analoguous to the copy 7708 // constructor rules. Note that virtual bases are not taken into account 7709 // for determining the argument type of the operator. Note also that 7710 // operators taking an object instead of a reference are allowed. 7711 7712 ImplicitExceptionSpecification Spec(*this); 7713 bool Const; 7714 llvm::tie(Spec, Const) = 7715 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7716 7717 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7718 QualType RetType = Context.getLValueReferenceType(ArgType); 7719 if (Const) 7720 ArgType = ArgType.withConst(); 7721 ArgType = Context.getLValueReferenceType(ArgType); 7722 7723 // An implicitly-declared copy assignment operator is an inline public 7724 // member of its class. 7725 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7726 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7727 SourceLocation ClassLoc = ClassDecl->getLocation(); 7728 DeclarationNameInfo NameInfo(Name, ClassLoc); 7729 CXXMethodDecl *CopyAssignment 7730 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7731 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7732 /*TInfo=*/0, /*isStatic=*/false, 7733 /*StorageClassAsWritten=*/SC_None, 7734 /*isInline=*/true, /*isConstexpr=*/false, 7735 SourceLocation()); 7736 CopyAssignment->setAccess(AS_public); 7737 CopyAssignment->setDefaulted(); 7738 CopyAssignment->setImplicit(); 7739 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7740 7741 // Add the parameter to the operator. 7742 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7743 ClassLoc, ClassLoc, /*Id=*/0, 7744 ArgType, /*TInfo=*/0, 7745 SC_None, 7746 SC_None, 0); 7747 CopyAssignment->setParams(FromParam); 7748 7749 // Note that we have added this copy-assignment operator. 7750 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7751 7752 if (Scope *S = getScopeForContext(ClassDecl)) 7753 PushOnScopeChains(CopyAssignment, S, false); 7754 ClassDecl->addDecl(CopyAssignment); 7755 7756 // C++0x [class.copy]p19: 7757 // .... If the class definition does not explicitly declare a copy 7758 // assignment operator, there is no user-declared move constructor, and 7759 // there is no user-declared move assignment operator, a copy assignment 7760 // operator is implicitly declared as defaulted. 7761 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7762 CopyAssignment->setDeletedAsWritten(); 7763 7764 AddOverriddenMethods(ClassDecl, CopyAssignment); 7765 return CopyAssignment; 7766} 7767 7768void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7769 CXXMethodDecl *CopyAssignOperator) { 7770 assert((CopyAssignOperator->isDefaulted() && 7771 CopyAssignOperator->isOverloadedOperator() && 7772 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7773 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7774 !CopyAssignOperator->isDeleted()) && 7775 "DefineImplicitCopyAssignment called for wrong function"); 7776 7777 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7778 7779 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7780 CopyAssignOperator->setInvalidDecl(); 7781 return; 7782 } 7783 7784 CopyAssignOperator->setUsed(); 7785 7786 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7787 DiagnosticErrorTrap Trap(Diags); 7788 7789 // C++0x [class.copy]p30: 7790 // The implicitly-defined or explicitly-defaulted copy assignment operator 7791 // for a non-union class X performs memberwise copy assignment of its 7792 // subobjects. The direct base classes of X are assigned first, in the 7793 // order of their declaration in the base-specifier-list, and then the 7794 // immediate non-static data members of X are assigned, in the order in 7795 // which they were declared in the class definition. 7796 7797 // The statements that form the synthesized function body. 7798 ASTOwningVector<Stmt*> Statements(*this); 7799 7800 // The parameter for the "other" object, which we are copying from. 7801 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7802 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7803 QualType OtherRefType = Other->getType(); 7804 if (const LValueReferenceType *OtherRef 7805 = OtherRefType->getAs<LValueReferenceType>()) { 7806 OtherRefType = OtherRef->getPointeeType(); 7807 OtherQuals = OtherRefType.getQualifiers(); 7808 } 7809 7810 // Our location for everything implicitly-generated. 7811 SourceLocation Loc = CopyAssignOperator->getLocation(); 7812 7813 // Construct a reference to the "other" object. We'll be using this 7814 // throughout the generated ASTs. 7815 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7816 assert(OtherRef && "Reference to parameter cannot fail!"); 7817 7818 // Construct the "this" pointer. We'll be using this throughout the generated 7819 // ASTs. 7820 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7821 assert(This && "Reference to this cannot fail!"); 7822 7823 // Assign base classes. 7824 bool Invalid = false; 7825 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7826 E = ClassDecl->bases_end(); Base != E; ++Base) { 7827 // Form the assignment: 7828 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7829 QualType BaseType = Base->getType().getUnqualifiedType(); 7830 if (!BaseType->isRecordType()) { 7831 Invalid = true; 7832 continue; 7833 } 7834 7835 CXXCastPath BasePath; 7836 BasePath.push_back(Base); 7837 7838 // Construct the "from" expression, which is an implicit cast to the 7839 // appropriately-qualified base type. 7840 Expr *From = OtherRef; 7841 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7842 CK_UncheckedDerivedToBase, 7843 VK_LValue, &BasePath).take(); 7844 7845 // Dereference "this". 7846 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7847 7848 // Implicitly cast "this" to the appropriately-qualified base type. 7849 To = ImpCastExprToType(To.take(), 7850 Context.getCVRQualifiedType(BaseType, 7851 CopyAssignOperator->getTypeQualifiers()), 7852 CK_UncheckedDerivedToBase, 7853 VK_LValue, &BasePath); 7854 7855 // Build the copy. 7856 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7857 To.get(), From, 7858 /*CopyingBaseSubobject=*/true, 7859 /*Copying=*/true); 7860 if (Copy.isInvalid()) { 7861 Diag(CurrentLocation, diag::note_member_synthesized_at) 7862 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7863 CopyAssignOperator->setInvalidDecl(); 7864 return; 7865 } 7866 7867 // Success! Record the copy. 7868 Statements.push_back(Copy.takeAs<Expr>()); 7869 } 7870 7871 // \brief Reference to the __builtin_memcpy function. 7872 Expr *BuiltinMemCpyRef = 0; 7873 // \brief Reference to the __builtin_objc_memmove_collectable function. 7874 Expr *CollectableMemCpyRef = 0; 7875 7876 // Assign non-static members. 7877 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7878 FieldEnd = ClassDecl->field_end(); 7879 Field != FieldEnd; ++Field) { 7880 if (Field->isUnnamedBitfield()) 7881 continue; 7882 7883 // Check for members of reference type; we can't copy those. 7884 if (Field->getType()->isReferenceType()) { 7885 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7886 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7887 Diag(Field->getLocation(), diag::note_declared_at); 7888 Diag(CurrentLocation, diag::note_member_synthesized_at) 7889 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7890 Invalid = true; 7891 continue; 7892 } 7893 7894 // Check for members of const-qualified, non-class type. 7895 QualType BaseType = Context.getBaseElementType(Field->getType()); 7896 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7897 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7898 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7899 Diag(Field->getLocation(), diag::note_declared_at); 7900 Diag(CurrentLocation, diag::note_member_synthesized_at) 7901 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7902 Invalid = true; 7903 continue; 7904 } 7905 7906 // Suppress assigning zero-width bitfields. 7907 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7908 continue; 7909 7910 QualType FieldType = Field->getType().getNonReferenceType(); 7911 if (FieldType->isIncompleteArrayType()) { 7912 assert(ClassDecl->hasFlexibleArrayMember() && 7913 "Incomplete array type is not valid"); 7914 continue; 7915 } 7916 7917 // Build references to the field in the object we're copying from and to. 7918 CXXScopeSpec SS; // Intentionally empty 7919 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7920 LookupMemberName); 7921 MemberLookup.addDecl(&*Field); 7922 MemberLookup.resolveKind(); 7923 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7924 Loc, /*IsArrow=*/false, 7925 SS, SourceLocation(), 0, 7926 MemberLookup, 0); 7927 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7928 Loc, /*IsArrow=*/true, 7929 SS, SourceLocation(), 0, 7930 MemberLookup, 0); 7931 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7932 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7933 7934 // If the field should be copied with __builtin_memcpy rather than via 7935 // explicit assignments, do so. This optimization only applies for arrays 7936 // of scalars and arrays of class type with trivial copy-assignment 7937 // operators. 7938 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7939 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7940 // Compute the size of the memory buffer to be copied. 7941 QualType SizeType = Context.getSizeType(); 7942 llvm::APInt Size(Context.getTypeSize(SizeType), 7943 Context.getTypeSizeInChars(BaseType).getQuantity()); 7944 for (const ConstantArrayType *Array 7945 = Context.getAsConstantArrayType(FieldType); 7946 Array; 7947 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7948 llvm::APInt ArraySize 7949 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7950 Size *= ArraySize; 7951 } 7952 7953 // Take the address of the field references for "from" and "to". 7954 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7955 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7956 7957 bool NeedsCollectableMemCpy = 7958 (BaseType->isRecordType() && 7959 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7960 7961 if (NeedsCollectableMemCpy) { 7962 if (!CollectableMemCpyRef) { 7963 // Create a reference to the __builtin_objc_memmove_collectable function. 7964 LookupResult R(*this, 7965 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7966 Loc, LookupOrdinaryName); 7967 LookupName(R, TUScope, true); 7968 7969 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7970 if (!CollectableMemCpy) { 7971 // Something went horribly wrong earlier, and we will have 7972 // complained about it. 7973 Invalid = true; 7974 continue; 7975 } 7976 7977 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7978 CollectableMemCpy->getType(), 7979 VK_LValue, Loc, 0).take(); 7980 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7981 } 7982 } 7983 // Create a reference to the __builtin_memcpy builtin function. 7984 else if (!BuiltinMemCpyRef) { 7985 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7986 LookupOrdinaryName); 7987 LookupName(R, TUScope, true); 7988 7989 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7990 if (!BuiltinMemCpy) { 7991 // Something went horribly wrong earlier, and we will have complained 7992 // about it. 7993 Invalid = true; 7994 continue; 7995 } 7996 7997 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7998 BuiltinMemCpy->getType(), 7999 VK_LValue, Loc, 0).take(); 8000 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8001 } 8002 8003 ASTOwningVector<Expr*> CallArgs(*this); 8004 CallArgs.push_back(To.takeAs<Expr>()); 8005 CallArgs.push_back(From.takeAs<Expr>()); 8006 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8007 ExprResult Call = ExprError(); 8008 if (NeedsCollectableMemCpy) 8009 Call = ActOnCallExpr(/*Scope=*/0, 8010 CollectableMemCpyRef, 8011 Loc, move_arg(CallArgs), 8012 Loc); 8013 else 8014 Call = ActOnCallExpr(/*Scope=*/0, 8015 BuiltinMemCpyRef, 8016 Loc, move_arg(CallArgs), 8017 Loc); 8018 8019 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8020 Statements.push_back(Call.takeAs<Expr>()); 8021 continue; 8022 } 8023 8024 // Build the copy of this field. 8025 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 8026 To.get(), From.get(), 8027 /*CopyingBaseSubobject=*/false, 8028 /*Copying=*/true); 8029 if (Copy.isInvalid()) { 8030 Diag(CurrentLocation, diag::note_member_synthesized_at) 8031 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8032 CopyAssignOperator->setInvalidDecl(); 8033 return; 8034 } 8035 8036 // Success! Record the copy. 8037 Statements.push_back(Copy.takeAs<Stmt>()); 8038 } 8039 8040 if (!Invalid) { 8041 // Add a "return *this;" 8042 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8043 8044 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8045 if (Return.isInvalid()) 8046 Invalid = true; 8047 else { 8048 Statements.push_back(Return.takeAs<Stmt>()); 8049 8050 if (Trap.hasErrorOccurred()) { 8051 Diag(CurrentLocation, diag::note_member_synthesized_at) 8052 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8053 Invalid = true; 8054 } 8055 } 8056 } 8057 8058 if (Invalid) { 8059 CopyAssignOperator->setInvalidDecl(); 8060 return; 8061 } 8062 8063 StmtResult Body; 8064 { 8065 CompoundScopeRAII CompoundScope(*this); 8066 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8067 /*isStmtExpr=*/false); 8068 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8069 } 8070 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8071 8072 if (ASTMutationListener *L = getASTMutationListener()) { 8073 L->CompletedImplicitDefinition(CopyAssignOperator); 8074 } 8075} 8076 8077Sema::ImplicitExceptionSpecification 8078Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 8079 ImplicitExceptionSpecification ExceptSpec(*this); 8080 8081 if (ClassDecl->isInvalidDecl()) 8082 return ExceptSpec; 8083 8084 // C++0x [except.spec]p14: 8085 // An implicitly declared special member function (Clause 12) shall have an 8086 // exception-specification. [...] 8087 8088 // It is unspecified whether or not an implicit move assignment operator 8089 // attempts to deduplicate calls to assignment operators of virtual bases are 8090 // made. As such, this exception specification is effectively unspecified. 8091 // Based on a similar decision made for constness in C++0x, we're erring on 8092 // the side of assuming such calls to be made regardless of whether they 8093 // actually happen. 8094 // Note that a move constructor is not implicitly declared when there are 8095 // virtual bases, but it can still be user-declared and explicitly defaulted. 8096 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8097 BaseEnd = ClassDecl->bases_end(); 8098 Base != BaseEnd; ++Base) { 8099 if (Base->isVirtual()) 8100 continue; 8101 8102 CXXRecordDecl *BaseClassDecl 8103 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8104 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8105 false, 0)) 8106 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8107 } 8108 8109 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8110 BaseEnd = ClassDecl->vbases_end(); 8111 Base != BaseEnd; ++Base) { 8112 CXXRecordDecl *BaseClassDecl 8113 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8114 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8115 false, 0)) 8116 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8117 } 8118 8119 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8120 FieldEnd = ClassDecl->field_end(); 8121 Field != FieldEnd; 8122 ++Field) { 8123 QualType FieldType = Context.getBaseElementType(Field->getType()); 8124 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8125 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8126 false, 0)) 8127 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8128 } 8129 } 8130 8131 return ExceptSpec; 8132} 8133 8134/// Determine whether the class type has any direct or indirect virtual base 8135/// classes which have a non-trivial move assignment operator. 8136static bool 8137hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8138 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8139 BaseEnd = ClassDecl->vbases_end(); 8140 Base != BaseEnd; ++Base) { 8141 CXXRecordDecl *BaseClass = 8142 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8143 8144 // Try to declare the move assignment. If it would be deleted, then the 8145 // class does not have a non-trivial move assignment. 8146 if (BaseClass->needsImplicitMoveAssignment()) 8147 S.DeclareImplicitMoveAssignment(BaseClass); 8148 8149 // If the class has both a trivial move assignment and a non-trivial move 8150 // assignment, hasTrivialMoveAssignment() is false. 8151 if (BaseClass->hasDeclaredMoveAssignment() && 8152 !BaseClass->hasTrivialMoveAssignment()) 8153 return true; 8154 } 8155 8156 return false; 8157} 8158 8159/// Determine whether the given type either has a move constructor or is 8160/// trivially copyable. 8161static bool 8162hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8163 Type = S.Context.getBaseElementType(Type); 8164 8165 // FIXME: Technically, non-trivially-copyable non-class types, such as 8166 // reference types, are supposed to return false here, but that appears 8167 // to be a standard defect. 8168 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8169 if (!ClassDecl || !ClassDecl->getDefinition()) 8170 return true; 8171 8172 if (Type.isTriviallyCopyableType(S.Context)) 8173 return true; 8174 8175 if (IsConstructor) { 8176 if (ClassDecl->needsImplicitMoveConstructor()) 8177 S.DeclareImplicitMoveConstructor(ClassDecl); 8178 return ClassDecl->hasDeclaredMoveConstructor(); 8179 } 8180 8181 if (ClassDecl->needsImplicitMoveAssignment()) 8182 S.DeclareImplicitMoveAssignment(ClassDecl); 8183 return ClassDecl->hasDeclaredMoveAssignment(); 8184} 8185 8186/// Determine whether all non-static data members and direct or virtual bases 8187/// of class \p ClassDecl have either a move operation, or are trivially 8188/// copyable. 8189static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8190 bool IsConstructor) { 8191 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8192 BaseEnd = ClassDecl->bases_end(); 8193 Base != BaseEnd; ++Base) { 8194 if (Base->isVirtual()) 8195 continue; 8196 8197 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8198 return false; 8199 } 8200 8201 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8202 BaseEnd = ClassDecl->vbases_end(); 8203 Base != BaseEnd; ++Base) { 8204 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8205 return false; 8206 } 8207 8208 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8209 FieldEnd = ClassDecl->field_end(); 8210 Field != FieldEnd; ++Field) { 8211 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8212 return false; 8213 } 8214 8215 return true; 8216} 8217 8218CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8219 // C++11 [class.copy]p20: 8220 // If the definition of a class X does not explicitly declare a move 8221 // assignment operator, one will be implicitly declared as defaulted 8222 // if and only if: 8223 // 8224 // - [first 4 bullets] 8225 assert(ClassDecl->needsImplicitMoveAssignment()); 8226 8227 // [Checked after we build the declaration] 8228 // - the move assignment operator would not be implicitly defined as 8229 // deleted, 8230 8231 // [DR1402]: 8232 // - X has no direct or indirect virtual base class with a non-trivial 8233 // move assignment operator, and 8234 // - each of X's non-static data members and direct or virtual base classes 8235 // has a type that either has a move assignment operator or is trivially 8236 // copyable. 8237 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8238 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8239 ClassDecl->setFailedImplicitMoveAssignment(); 8240 return 0; 8241 } 8242 8243 // Note: The following rules are largely analoguous to the move 8244 // constructor rules. 8245 8246 ImplicitExceptionSpecification Spec( 8247 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8248 8249 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8250 QualType RetType = Context.getLValueReferenceType(ArgType); 8251 ArgType = Context.getRValueReferenceType(ArgType); 8252 8253 // An implicitly-declared move assignment operator is an inline public 8254 // member of its class. 8255 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8256 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8257 SourceLocation ClassLoc = ClassDecl->getLocation(); 8258 DeclarationNameInfo NameInfo(Name, ClassLoc); 8259 CXXMethodDecl *MoveAssignment 8260 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8261 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8262 /*TInfo=*/0, /*isStatic=*/false, 8263 /*StorageClassAsWritten=*/SC_None, 8264 /*isInline=*/true, 8265 /*isConstexpr=*/false, 8266 SourceLocation()); 8267 MoveAssignment->setAccess(AS_public); 8268 MoveAssignment->setDefaulted(); 8269 MoveAssignment->setImplicit(); 8270 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8271 8272 // Add the parameter to the operator. 8273 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8274 ClassLoc, ClassLoc, /*Id=*/0, 8275 ArgType, /*TInfo=*/0, 8276 SC_None, 8277 SC_None, 0); 8278 MoveAssignment->setParams(FromParam); 8279 8280 // Note that we have added this copy-assignment operator. 8281 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8282 8283 // C++0x [class.copy]p9: 8284 // If the definition of a class X does not explicitly declare a move 8285 // assignment operator, one will be implicitly declared as defaulted if and 8286 // only if: 8287 // [...] 8288 // - the move assignment operator would not be implicitly defined as 8289 // deleted. 8290 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8291 // Cache this result so that we don't try to generate this over and over 8292 // on every lookup, leaking memory and wasting time. 8293 ClassDecl->setFailedImplicitMoveAssignment(); 8294 return 0; 8295 } 8296 8297 if (Scope *S = getScopeForContext(ClassDecl)) 8298 PushOnScopeChains(MoveAssignment, S, false); 8299 ClassDecl->addDecl(MoveAssignment); 8300 8301 AddOverriddenMethods(ClassDecl, MoveAssignment); 8302 return MoveAssignment; 8303} 8304 8305void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8306 CXXMethodDecl *MoveAssignOperator) { 8307 assert((MoveAssignOperator->isDefaulted() && 8308 MoveAssignOperator->isOverloadedOperator() && 8309 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8310 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8311 !MoveAssignOperator->isDeleted()) && 8312 "DefineImplicitMoveAssignment called for wrong function"); 8313 8314 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8315 8316 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8317 MoveAssignOperator->setInvalidDecl(); 8318 return; 8319 } 8320 8321 MoveAssignOperator->setUsed(); 8322 8323 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8324 DiagnosticErrorTrap Trap(Diags); 8325 8326 // C++0x [class.copy]p28: 8327 // The implicitly-defined or move assignment operator for a non-union class 8328 // X performs memberwise move assignment of its subobjects. The direct base 8329 // classes of X are assigned first, in the order of their declaration in the 8330 // base-specifier-list, and then the immediate non-static data members of X 8331 // are assigned, in the order in which they were declared in the class 8332 // definition. 8333 8334 // The statements that form the synthesized function body. 8335 ASTOwningVector<Stmt*> Statements(*this); 8336 8337 // The parameter for the "other" object, which we are move from. 8338 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8339 QualType OtherRefType = Other->getType()-> 8340 getAs<RValueReferenceType>()->getPointeeType(); 8341 assert(OtherRefType.getQualifiers() == 0 && 8342 "Bad argument type of defaulted move assignment"); 8343 8344 // Our location for everything implicitly-generated. 8345 SourceLocation Loc = MoveAssignOperator->getLocation(); 8346 8347 // Construct a reference to the "other" object. We'll be using this 8348 // throughout the generated ASTs. 8349 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8350 assert(OtherRef && "Reference to parameter cannot fail!"); 8351 // Cast to rvalue. 8352 OtherRef = CastForMoving(*this, OtherRef); 8353 8354 // Construct the "this" pointer. We'll be using this throughout the generated 8355 // ASTs. 8356 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8357 assert(This && "Reference to this cannot fail!"); 8358 8359 // Assign base classes. 8360 bool Invalid = false; 8361 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8362 E = ClassDecl->bases_end(); Base != E; ++Base) { 8363 // Form the assignment: 8364 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8365 QualType BaseType = Base->getType().getUnqualifiedType(); 8366 if (!BaseType->isRecordType()) { 8367 Invalid = true; 8368 continue; 8369 } 8370 8371 CXXCastPath BasePath; 8372 BasePath.push_back(Base); 8373 8374 // Construct the "from" expression, which is an implicit cast to the 8375 // appropriately-qualified base type. 8376 Expr *From = OtherRef; 8377 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8378 VK_XValue, &BasePath).take(); 8379 8380 // Dereference "this". 8381 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8382 8383 // Implicitly cast "this" to the appropriately-qualified base type. 8384 To = ImpCastExprToType(To.take(), 8385 Context.getCVRQualifiedType(BaseType, 8386 MoveAssignOperator->getTypeQualifiers()), 8387 CK_UncheckedDerivedToBase, 8388 VK_LValue, &BasePath); 8389 8390 // Build the move. 8391 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8392 To.get(), From, 8393 /*CopyingBaseSubobject=*/true, 8394 /*Copying=*/false); 8395 if (Move.isInvalid()) { 8396 Diag(CurrentLocation, diag::note_member_synthesized_at) 8397 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8398 MoveAssignOperator->setInvalidDecl(); 8399 return; 8400 } 8401 8402 // Success! Record the move. 8403 Statements.push_back(Move.takeAs<Expr>()); 8404 } 8405 8406 // \brief Reference to the __builtin_memcpy function. 8407 Expr *BuiltinMemCpyRef = 0; 8408 // \brief Reference to the __builtin_objc_memmove_collectable function. 8409 Expr *CollectableMemCpyRef = 0; 8410 8411 // Assign non-static members. 8412 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8413 FieldEnd = ClassDecl->field_end(); 8414 Field != FieldEnd; ++Field) { 8415 if (Field->isUnnamedBitfield()) 8416 continue; 8417 8418 // Check for members of reference type; we can't move those. 8419 if (Field->getType()->isReferenceType()) { 8420 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8421 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8422 Diag(Field->getLocation(), diag::note_declared_at); 8423 Diag(CurrentLocation, diag::note_member_synthesized_at) 8424 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8425 Invalid = true; 8426 continue; 8427 } 8428 8429 // Check for members of const-qualified, non-class type. 8430 QualType BaseType = Context.getBaseElementType(Field->getType()); 8431 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8432 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8433 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8434 Diag(Field->getLocation(), diag::note_declared_at); 8435 Diag(CurrentLocation, diag::note_member_synthesized_at) 8436 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8437 Invalid = true; 8438 continue; 8439 } 8440 8441 // Suppress assigning zero-width bitfields. 8442 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8443 continue; 8444 8445 QualType FieldType = Field->getType().getNonReferenceType(); 8446 if (FieldType->isIncompleteArrayType()) { 8447 assert(ClassDecl->hasFlexibleArrayMember() && 8448 "Incomplete array type is not valid"); 8449 continue; 8450 } 8451 8452 // Build references to the field in the object we're copying from and to. 8453 CXXScopeSpec SS; // Intentionally empty 8454 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8455 LookupMemberName); 8456 MemberLookup.addDecl(&*Field); 8457 MemberLookup.resolveKind(); 8458 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8459 Loc, /*IsArrow=*/false, 8460 SS, SourceLocation(), 0, 8461 MemberLookup, 0); 8462 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8463 Loc, /*IsArrow=*/true, 8464 SS, SourceLocation(), 0, 8465 MemberLookup, 0); 8466 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8467 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8468 8469 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8470 "Member reference with rvalue base must be rvalue except for reference " 8471 "members, which aren't allowed for move assignment."); 8472 8473 // If the field should be copied with __builtin_memcpy rather than via 8474 // explicit assignments, do so. This optimization only applies for arrays 8475 // of scalars and arrays of class type with trivial move-assignment 8476 // operators. 8477 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8478 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8479 // Compute the size of the memory buffer to be copied. 8480 QualType SizeType = Context.getSizeType(); 8481 llvm::APInt Size(Context.getTypeSize(SizeType), 8482 Context.getTypeSizeInChars(BaseType).getQuantity()); 8483 for (const ConstantArrayType *Array 8484 = Context.getAsConstantArrayType(FieldType); 8485 Array; 8486 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8487 llvm::APInt ArraySize 8488 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8489 Size *= ArraySize; 8490 } 8491 8492 // Take the address of the field references for "from" and "to". We 8493 // directly construct UnaryOperators here because semantic analysis 8494 // does not permit us to take the address of an xvalue. 8495 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8496 Context.getPointerType(From.get()->getType()), 8497 VK_RValue, OK_Ordinary, Loc); 8498 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8499 Context.getPointerType(To.get()->getType()), 8500 VK_RValue, OK_Ordinary, Loc); 8501 8502 bool NeedsCollectableMemCpy = 8503 (BaseType->isRecordType() && 8504 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8505 8506 if (NeedsCollectableMemCpy) { 8507 if (!CollectableMemCpyRef) { 8508 // Create a reference to the __builtin_objc_memmove_collectable function. 8509 LookupResult R(*this, 8510 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8511 Loc, LookupOrdinaryName); 8512 LookupName(R, TUScope, true); 8513 8514 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8515 if (!CollectableMemCpy) { 8516 // Something went horribly wrong earlier, and we will have 8517 // complained about it. 8518 Invalid = true; 8519 continue; 8520 } 8521 8522 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8523 CollectableMemCpy->getType(), 8524 VK_LValue, Loc, 0).take(); 8525 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8526 } 8527 } 8528 // Create a reference to the __builtin_memcpy builtin function. 8529 else if (!BuiltinMemCpyRef) { 8530 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8531 LookupOrdinaryName); 8532 LookupName(R, TUScope, true); 8533 8534 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8535 if (!BuiltinMemCpy) { 8536 // Something went horribly wrong earlier, and we will have complained 8537 // about it. 8538 Invalid = true; 8539 continue; 8540 } 8541 8542 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8543 BuiltinMemCpy->getType(), 8544 VK_LValue, Loc, 0).take(); 8545 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8546 } 8547 8548 ASTOwningVector<Expr*> CallArgs(*this); 8549 CallArgs.push_back(To.takeAs<Expr>()); 8550 CallArgs.push_back(From.takeAs<Expr>()); 8551 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8552 ExprResult Call = ExprError(); 8553 if (NeedsCollectableMemCpy) 8554 Call = ActOnCallExpr(/*Scope=*/0, 8555 CollectableMemCpyRef, 8556 Loc, move_arg(CallArgs), 8557 Loc); 8558 else 8559 Call = ActOnCallExpr(/*Scope=*/0, 8560 BuiltinMemCpyRef, 8561 Loc, move_arg(CallArgs), 8562 Loc); 8563 8564 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8565 Statements.push_back(Call.takeAs<Expr>()); 8566 continue; 8567 } 8568 8569 // Build the move of this field. 8570 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8571 To.get(), From.get(), 8572 /*CopyingBaseSubobject=*/false, 8573 /*Copying=*/false); 8574 if (Move.isInvalid()) { 8575 Diag(CurrentLocation, diag::note_member_synthesized_at) 8576 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8577 MoveAssignOperator->setInvalidDecl(); 8578 return; 8579 } 8580 8581 // Success! Record the copy. 8582 Statements.push_back(Move.takeAs<Stmt>()); 8583 } 8584 8585 if (!Invalid) { 8586 // Add a "return *this;" 8587 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8588 8589 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8590 if (Return.isInvalid()) 8591 Invalid = true; 8592 else { 8593 Statements.push_back(Return.takeAs<Stmt>()); 8594 8595 if (Trap.hasErrorOccurred()) { 8596 Diag(CurrentLocation, diag::note_member_synthesized_at) 8597 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8598 Invalid = true; 8599 } 8600 } 8601 } 8602 8603 if (Invalid) { 8604 MoveAssignOperator->setInvalidDecl(); 8605 return; 8606 } 8607 8608 StmtResult Body; 8609 { 8610 CompoundScopeRAII CompoundScope(*this); 8611 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8612 /*isStmtExpr=*/false); 8613 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8614 } 8615 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8616 8617 if (ASTMutationListener *L = getASTMutationListener()) { 8618 L->CompletedImplicitDefinition(MoveAssignOperator); 8619 } 8620} 8621 8622std::pair<Sema::ImplicitExceptionSpecification, bool> 8623Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8624 if (ClassDecl->isInvalidDecl()) 8625 return std::make_pair(ImplicitExceptionSpecification(*this), false); 8626 8627 // C++ [class.copy]p5: 8628 // The implicitly-declared copy constructor for a class X will 8629 // have the form 8630 // 8631 // X::X(const X&) 8632 // 8633 // if 8634 // FIXME: It ought to be possible to store this on the record. 8635 bool HasConstCopyConstructor = true; 8636 8637 // -- each direct or virtual base class B of X has a copy 8638 // constructor whose first parameter is of type const B& or 8639 // const volatile B&, and 8640 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8641 BaseEnd = ClassDecl->bases_end(); 8642 HasConstCopyConstructor && Base != BaseEnd; 8643 ++Base) { 8644 // Virtual bases are handled below. 8645 if (Base->isVirtual()) 8646 continue; 8647 8648 CXXRecordDecl *BaseClassDecl 8649 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8650 HasConstCopyConstructor &= 8651 (bool)LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const); 8652 } 8653 8654 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8655 BaseEnd = ClassDecl->vbases_end(); 8656 HasConstCopyConstructor && Base != BaseEnd; 8657 ++Base) { 8658 CXXRecordDecl *BaseClassDecl 8659 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8660 HasConstCopyConstructor &= 8661 (bool)LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const); 8662 } 8663 8664 // -- for all the nonstatic data members of X that are of a 8665 // class type M (or array thereof), each such class type 8666 // has a copy constructor whose first parameter is of type 8667 // const M& or const volatile M&. 8668 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8669 FieldEnd = ClassDecl->field_end(); 8670 HasConstCopyConstructor && Field != FieldEnd; 8671 ++Field) { 8672 QualType FieldType = Context.getBaseElementType(Field->getType()); 8673 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8674 HasConstCopyConstructor &= 8675 (bool)LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const); 8676 } 8677 } 8678 // Otherwise, the implicitly declared copy constructor will have 8679 // the form 8680 // 8681 // X::X(X&) 8682 8683 // C++ [except.spec]p14: 8684 // An implicitly declared special member function (Clause 12) shall have an 8685 // exception-specification. [...] 8686 ImplicitExceptionSpecification ExceptSpec(*this); 8687 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8688 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8689 BaseEnd = ClassDecl->bases_end(); 8690 Base != BaseEnd; 8691 ++Base) { 8692 // Virtual bases are handled below. 8693 if (Base->isVirtual()) 8694 continue; 8695 8696 CXXRecordDecl *BaseClassDecl 8697 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8698 if (CXXConstructorDecl *CopyConstructor = 8699 LookupCopyingConstructor(BaseClassDecl, Quals)) 8700 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8701 } 8702 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8703 BaseEnd = ClassDecl->vbases_end(); 8704 Base != BaseEnd; 8705 ++Base) { 8706 CXXRecordDecl *BaseClassDecl 8707 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8708 if (CXXConstructorDecl *CopyConstructor = 8709 LookupCopyingConstructor(BaseClassDecl, Quals)) 8710 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8711 } 8712 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8713 FieldEnd = ClassDecl->field_end(); 8714 Field != FieldEnd; 8715 ++Field) { 8716 QualType FieldType = Context.getBaseElementType(Field->getType()); 8717 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8718 if (CXXConstructorDecl *CopyConstructor = 8719 LookupCopyingConstructor(FieldClassDecl, Quals)) 8720 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8721 } 8722 } 8723 8724 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8725} 8726 8727CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8728 CXXRecordDecl *ClassDecl) { 8729 // C++ [class.copy]p4: 8730 // If the class definition does not explicitly declare a copy 8731 // constructor, one is declared implicitly. 8732 8733 ImplicitExceptionSpecification Spec(*this); 8734 bool Const; 8735 llvm::tie(Spec, Const) = 8736 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8737 8738 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8739 QualType ArgType = ClassType; 8740 if (Const) 8741 ArgType = ArgType.withConst(); 8742 ArgType = Context.getLValueReferenceType(ArgType); 8743 8744 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8745 8746 DeclarationName Name 8747 = Context.DeclarationNames.getCXXConstructorName( 8748 Context.getCanonicalType(ClassType)); 8749 SourceLocation ClassLoc = ClassDecl->getLocation(); 8750 DeclarationNameInfo NameInfo(Name, ClassLoc); 8751 8752 // An implicitly-declared copy constructor is an inline public 8753 // member of its class. 8754 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8755 Context, ClassDecl, ClassLoc, NameInfo, 8756 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8757 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8758 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8759 getLangOpts().CPlusPlus0x); 8760 CopyConstructor->setAccess(AS_public); 8761 CopyConstructor->setDefaulted(); 8762 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8763 8764 // Note that we have declared this constructor. 8765 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8766 8767 // Add the parameter to the constructor. 8768 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8769 ClassLoc, ClassLoc, 8770 /*IdentifierInfo=*/0, 8771 ArgType, /*TInfo=*/0, 8772 SC_None, 8773 SC_None, 0); 8774 CopyConstructor->setParams(FromParam); 8775 8776 if (Scope *S = getScopeForContext(ClassDecl)) 8777 PushOnScopeChains(CopyConstructor, S, false); 8778 ClassDecl->addDecl(CopyConstructor); 8779 8780 // C++11 [class.copy]p8: 8781 // ... If the class definition does not explicitly declare a copy 8782 // constructor, there is no user-declared move constructor, and there is no 8783 // user-declared move assignment operator, a copy constructor is implicitly 8784 // declared as defaulted. 8785 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8786 CopyConstructor->setDeletedAsWritten(); 8787 8788 return CopyConstructor; 8789} 8790 8791void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8792 CXXConstructorDecl *CopyConstructor) { 8793 assert((CopyConstructor->isDefaulted() && 8794 CopyConstructor->isCopyConstructor() && 8795 !CopyConstructor->doesThisDeclarationHaveABody() && 8796 !CopyConstructor->isDeleted()) && 8797 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8798 8799 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8800 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8801 8802 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8803 DiagnosticErrorTrap Trap(Diags); 8804 8805 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8806 Trap.hasErrorOccurred()) { 8807 Diag(CurrentLocation, diag::note_member_synthesized_at) 8808 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8809 CopyConstructor->setInvalidDecl(); 8810 } else { 8811 Sema::CompoundScopeRAII CompoundScope(*this); 8812 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8813 CopyConstructor->getLocation(), 8814 MultiStmtArg(*this, 0, 0), 8815 /*isStmtExpr=*/false) 8816 .takeAs<Stmt>()); 8817 CopyConstructor->setImplicitlyDefined(true); 8818 } 8819 8820 CopyConstructor->setUsed(); 8821 if (ASTMutationListener *L = getASTMutationListener()) { 8822 L->CompletedImplicitDefinition(CopyConstructor); 8823 } 8824} 8825 8826Sema::ImplicitExceptionSpecification 8827Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8828 // C++ [except.spec]p14: 8829 // An implicitly declared special member function (Clause 12) shall have an 8830 // exception-specification. [...] 8831 ImplicitExceptionSpecification ExceptSpec(*this); 8832 if (ClassDecl->isInvalidDecl()) 8833 return ExceptSpec; 8834 8835 // Direct base-class constructors. 8836 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8837 BEnd = ClassDecl->bases_end(); 8838 B != BEnd; ++B) { 8839 if (B->isVirtual()) // Handled below. 8840 continue; 8841 8842 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8843 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8844 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8845 // If this is a deleted function, add it anyway. This might be conformant 8846 // with the standard. This might not. I'm not sure. It might not matter. 8847 if (Constructor) 8848 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8849 } 8850 } 8851 8852 // Virtual base-class constructors. 8853 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8854 BEnd = ClassDecl->vbases_end(); 8855 B != BEnd; ++B) { 8856 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8857 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8858 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8859 // If this is a deleted function, add it anyway. This might be conformant 8860 // with the standard. This might not. I'm not sure. It might not matter. 8861 if (Constructor) 8862 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8863 } 8864 } 8865 8866 // Field constructors. 8867 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8868 FEnd = ClassDecl->field_end(); 8869 F != FEnd; ++F) { 8870 if (const RecordType *RecordTy 8871 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8872 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8873 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8874 // If this is a deleted function, add it anyway. This might be conformant 8875 // with the standard. This might not. I'm not sure. It might not matter. 8876 // In particular, the problem is that this function never gets called. It 8877 // might just be ill-formed because this function attempts to refer to 8878 // a deleted function here. 8879 if (Constructor) 8880 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8881 } 8882 } 8883 8884 return ExceptSpec; 8885} 8886 8887CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8888 CXXRecordDecl *ClassDecl) { 8889 // C++11 [class.copy]p9: 8890 // If the definition of a class X does not explicitly declare a move 8891 // constructor, one will be implicitly declared as defaulted if and only if: 8892 // 8893 // - [first 4 bullets] 8894 assert(ClassDecl->needsImplicitMoveConstructor()); 8895 8896 // [Checked after we build the declaration] 8897 // - the move assignment operator would not be implicitly defined as 8898 // deleted, 8899 8900 // [DR1402]: 8901 // - each of X's non-static data members and direct or virtual base classes 8902 // has a type that either has a move constructor or is trivially copyable. 8903 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8904 ClassDecl->setFailedImplicitMoveConstructor(); 8905 return 0; 8906 } 8907 8908 ImplicitExceptionSpecification Spec( 8909 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8910 8911 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8912 QualType ArgType = Context.getRValueReferenceType(ClassType); 8913 8914 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8915 8916 DeclarationName Name 8917 = Context.DeclarationNames.getCXXConstructorName( 8918 Context.getCanonicalType(ClassType)); 8919 SourceLocation ClassLoc = ClassDecl->getLocation(); 8920 DeclarationNameInfo NameInfo(Name, ClassLoc); 8921 8922 // C++0x [class.copy]p11: 8923 // An implicitly-declared copy/move constructor is an inline public 8924 // member of its class. 8925 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8926 Context, ClassDecl, ClassLoc, NameInfo, 8927 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8928 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8929 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8930 getLangOpts().CPlusPlus0x); 8931 MoveConstructor->setAccess(AS_public); 8932 MoveConstructor->setDefaulted(); 8933 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8934 8935 // Add the parameter to the constructor. 8936 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8937 ClassLoc, ClassLoc, 8938 /*IdentifierInfo=*/0, 8939 ArgType, /*TInfo=*/0, 8940 SC_None, 8941 SC_None, 0); 8942 MoveConstructor->setParams(FromParam); 8943 8944 // C++0x [class.copy]p9: 8945 // If the definition of a class X does not explicitly declare a move 8946 // constructor, one will be implicitly declared as defaulted if and only if: 8947 // [...] 8948 // - the move constructor would not be implicitly defined as deleted. 8949 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8950 // Cache this result so that we don't try to generate this over and over 8951 // on every lookup, leaking memory and wasting time. 8952 ClassDecl->setFailedImplicitMoveConstructor(); 8953 return 0; 8954 } 8955 8956 // Note that we have declared this constructor. 8957 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8958 8959 if (Scope *S = getScopeForContext(ClassDecl)) 8960 PushOnScopeChains(MoveConstructor, S, false); 8961 ClassDecl->addDecl(MoveConstructor); 8962 8963 return MoveConstructor; 8964} 8965 8966void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8967 CXXConstructorDecl *MoveConstructor) { 8968 assert((MoveConstructor->isDefaulted() && 8969 MoveConstructor->isMoveConstructor() && 8970 !MoveConstructor->doesThisDeclarationHaveABody() && 8971 !MoveConstructor->isDeleted()) && 8972 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8973 8974 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8975 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8976 8977 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8978 DiagnosticErrorTrap Trap(Diags); 8979 8980 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8981 Trap.hasErrorOccurred()) { 8982 Diag(CurrentLocation, diag::note_member_synthesized_at) 8983 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8984 MoveConstructor->setInvalidDecl(); 8985 } else { 8986 Sema::CompoundScopeRAII CompoundScope(*this); 8987 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8988 MoveConstructor->getLocation(), 8989 MultiStmtArg(*this, 0, 0), 8990 /*isStmtExpr=*/false) 8991 .takeAs<Stmt>()); 8992 MoveConstructor->setImplicitlyDefined(true); 8993 } 8994 8995 MoveConstructor->setUsed(); 8996 8997 if (ASTMutationListener *L = getASTMutationListener()) { 8998 L->CompletedImplicitDefinition(MoveConstructor); 8999 } 9000} 9001 9002bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 9003 return FD->isDeleted() && 9004 (FD->isDefaulted() || FD->isImplicit()) && 9005 isa<CXXMethodDecl>(FD); 9006} 9007 9008/// \brief Mark the call operator of the given lambda closure type as "used". 9009static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 9010 CXXMethodDecl *CallOperator 9011 = cast<CXXMethodDecl>( 9012 *Lambda->lookup( 9013 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 9014 CallOperator->setReferenced(); 9015 CallOperator->setUsed(); 9016} 9017 9018void Sema::DefineImplicitLambdaToFunctionPointerConversion( 9019 SourceLocation CurrentLocation, 9020 CXXConversionDecl *Conv) 9021{ 9022 CXXRecordDecl *Lambda = Conv->getParent(); 9023 9024 // Make sure that the lambda call operator is marked used. 9025 markLambdaCallOperatorUsed(*this, Lambda); 9026 9027 Conv->setUsed(); 9028 9029 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 9030 DiagnosticErrorTrap Trap(Diags); 9031 9032 // Return the address of the __invoke function. 9033 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 9034 CXXMethodDecl *Invoke 9035 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 9036 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 9037 VK_LValue, Conv->getLocation()).take(); 9038 assert(FunctionRef && "Can't refer to __invoke function?"); 9039 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 9040 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 9041 Conv->getLocation(), 9042 Conv->getLocation())); 9043 9044 // Fill in the __invoke function with a dummy implementation. IR generation 9045 // will fill in the actual details. 9046 Invoke->setUsed(); 9047 Invoke->setReferenced(); 9048 Invoke->setBody(new (Context) CompoundStmt(Context, 0, 0, Conv->getLocation(), 9049 Conv->getLocation())); 9050 9051 if (ASTMutationListener *L = getASTMutationListener()) { 9052 L->CompletedImplicitDefinition(Conv); 9053 L->CompletedImplicitDefinition(Invoke); 9054 } 9055} 9056 9057void Sema::DefineImplicitLambdaToBlockPointerConversion( 9058 SourceLocation CurrentLocation, 9059 CXXConversionDecl *Conv) 9060{ 9061 Conv->setUsed(); 9062 9063 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 9064 DiagnosticErrorTrap Trap(Diags); 9065 9066 // Copy-initialize the lambda object as needed to capture it. 9067 Expr *This = ActOnCXXThis(CurrentLocation).take(); 9068 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 9069 9070 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 9071 Conv->getLocation(), 9072 Conv, DerefThis); 9073 9074 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 9075 // behavior. Note that only the general conversion function does this 9076 // (since it's unusable otherwise); in the case where we inline the 9077 // block literal, it has block literal lifetime semantics. 9078 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 9079 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 9080 CK_CopyAndAutoreleaseBlockObject, 9081 BuildBlock.get(), 0, VK_RValue); 9082 9083 if (BuildBlock.isInvalid()) { 9084 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9085 Conv->setInvalidDecl(); 9086 return; 9087 } 9088 9089 // Create the return statement that returns the block from the conversion 9090 // function. 9091 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9092 if (Return.isInvalid()) { 9093 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9094 Conv->setInvalidDecl(); 9095 return; 9096 } 9097 9098 // Set the body of the conversion function. 9099 Stmt *ReturnS = Return.take(); 9100 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 9101 Conv->getLocation(), 9102 Conv->getLocation())); 9103 9104 // We're done; notify the mutation listener, if any. 9105 if (ASTMutationListener *L = getASTMutationListener()) { 9106 L->CompletedImplicitDefinition(Conv); 9107 } 9108} 9109 9110/// \brief Determine whether the given list arguments contains exactly one 9111/// "real" (non-default) argument. 9112static bool hasOneRealArgument(MultiExprArg Args) { 9113 switch (Args.size()) { 9114 case 0: 9115 return false; 9116 9117 default: 9118 if (!Args.get()[1]->isDefaultArgument()) 9119 return false; 9120 9121 // fall through 9122 case 1: 9123 return !Args.get()[0]->isDefaultArgument(); 9124 } 9125 9126 return false; 9127} 9128 9129ExprResult 9130Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9131 CXXConstructorDecl *Constructor, 9132 MultiExprArg ExprArgs, 9133 bool HadMultipleCandidates, 9134 bool RequiresZeroInit, 9135 unsigned ConstructKind, 9136 SourceRange ParenRange) { 9137 bool Elidable = false; 9138 9139 // C++0x [class.copy]p34: 9140 // When certain criteria are met, an implementation is allowed to 9141 // omit the copy/move construction of a class object, even if the 9142 // copy/move constructor and/or destructor for the object have 9143 // side effects. [...] 9144 // - when a temporary class object that has not been bound to a 9145 // reference (12.2) would be copied/moved to a class object 9146 // with the same cv-unqualified type, the copy/move operation 9147 // can be omitted by constructing the temporary object 9148 // directly into the target of the omitted copy/move 9149 if (ConstructKind == CXXConstructExpr::CK_Complete && 9150 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9151 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 9152 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9153 } 9154 9155 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9156 Elidable, move(ExprArgs), HadMultipleCandidates, 9157 RequiresZeroInit, ConstructKind, ParenRange); 9158} 9159 9160/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9161/// including handling of its default argument expressions. 9162ExprResult 9163Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9164 CXXConstructorDecl *Constructor, bool Elidable, 9165 MultiExprArg ExprArgs, 9166 bool HadMultipleCandidates, 9167 bool RequiresZeroInit, 9168 unsigned ConstructKind, 9169 SourceRange ParenRange) { 9170 unsigned NumExprs = ExprArgs.size(); 9171 Expr **Exprs = (Expr **)ExprArgs.release(); 9172 9173 for (specific_attr_iterator<NonNullAttr> 9174 i = Constructor->specific_attr_begin<NonNullAttr>(), 9175 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 9176 const NonNullAttr *NonNull = *i; 9177 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 9178 } 9179 9180 MarkFunctionReferenced(ConstructLoc, Constructor); 9181 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9182 Constructor, Elidable, Exprs, NumExprs, 9183 HadMultipleCandidates, /*FIXME*/false, 9184 RequiresZeroInit, 9185 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9186 ParenRange)); 9187} 9188 9189bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9190 CXXConstructorDecl *Constructor, 9191 MultiExprArg Exprs, 9192 bool HadMultipleCandidates) { 9193 // FIXME: Provide the correct paren SourceRange when available. 9194 ExprResult TempResult = 9195 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9196 move(Exprs), HadMultipleCandidates, false, 9197 CXXConstructExpr::CK_Complete, SourceRange()); 9198 if (TempResult.isInvalid()) 9199 return true; 9200 9201 Expr *Temp = TempResult.takeAs<Expr>(); 9202 CheckImplicitConversions(Temp, VD->getLocation()); 9203 MarkFunctionReferenced(VD->getLocation(), Constructor); 9204 Temp = MaybeCreateExprWithCleanups(Temp); 9205 VD->setInit(Temp); 9206 9207 return false; 9208} 9209 9210void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9211 if (VD->isInvalidDecl()) return; 9212 9213 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9214 if (ClassDecl->isInvalidDecl()) return; 9215 if (ClassDecl->hasIrrelevantDestructor()) return; 9216 if (ClassDecl->isDependentContext()) return; 9217 9218 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9219 MarkFunctionReferenced(VD->getLocation(), Destructor); 9220 CheckDestructorAccess(VD->getLocation(), Destructor, 9221 PDiag(diag::err_access_dtor_var) 9222 << VD->getDeclName() 9223 << VD->getType()); 9224 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9225 9226 if (!VD->hasGlobalStorage()) return; 9227 9228 // Emit warning for non-trivial dtor in global scope (a real global, 9229 // class-static, function-static). 9230 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9231 9232 // TODO: this should be re-enabled for static locals by !CXAAtExit 9233 if (!VD->isStaticLocal()) 9234 Diag(VD->getLocation(), diag::warn_global_destructor); 9235} 9236 9237/// \brief Given a constructor and the set of arguments provided for the 9238/// constructor, convert the arguments and add any required default arguments 9239/// to form a proper call to this constructor. 9240/// 9241/// \returns true if an error occurred, false otherwise. 9242bool 9243Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9244 MultiExprArg ArgsPtr, 9245 SourceLocation Loc, 9246 ASTOwningVector<Expr*> &ConvertedArgs, 9247 bool AllowExplicit) { 9248 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9249 unsigned NumArgs = ArgsPtr.size(); 9250 Expr **Args = (Expr **)ArgsPtr.get(); 9251 9252 const FunctionProtoType *Proto 9253 = Constructor->getType()->getAs<FunctionProtoType>(); 9254 assert(Proto && "Constructor without a prototype?"); 9255 unsigned NumArgsInProto = Proto->getNumArgs(); 9256 9257 // If too few arguments are available, we'll fill in the rest with defaults. 9258 if (NumArgs < NumArgsInProto) 9259 ConvertedArgs.reserve(NumArgsInProto); 9260 else 9261 ConvertedArgs.reserve(NumArgs); 9262 9263 VariadicCallType CallType = 9264 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9265 SmallVector<Expr *, 8> AllArgs; 9266 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9267 Proto, 0, Args, NumArgs, AllArgs, 9268 CallType, AllowExplicit); 9269 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9270 9271 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9272 9273 // FIXME: Missing call to CheckFunctionCall or equivalent 9274 9275 return Invalid; 9276} 9277 9278static inline bool 9279CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9280 const FunctionDecl *FnDecl) { 9281 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9282 if (isa<NamespaceDecl>(DC)) { 9283 return SemaRef.Diag(FnDecl->getLocation(), 9284 diag::err_operator_new_delete_declared_in_namespace) 9285 << FnDecl->getDeclName(); 9286 } 9287 9288 if (isa<TranslationUnitDecl>(DC) && 9289 FnDecl->getStorageClass() == SC_Static) { 9290 return SemaRef.Diag(FnDecl->getLocation(), 9291 diag::err_operator_new_delete_declared_static) 9292 << FnDecl->getDeclName(); 9293 } 9294 9295 return false; 9296} 9297 9298static inline bool 9299CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9300 CanQualType ExpectedResultType, 9301 CanQualType ExpectedFirstParamType, 9302 unsigned DependentParamTypeDiag, 9303 unsigned InvalidParamTypeDiag) { 9304 QualType ResultType = 9305 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9306 9307 // Check that the result type is not dependent. 9308 if (ResultType->isDependentType()) 9309 return SemaRef.Diag(FnDecl->getLocation(), 9310 diag::err_operator_new_delete_dependent_result_type) 9311 << FnDecl->getDeclName() << ExpectedResultType; 9312 9313 // Check that the result type is what we expect. 9314 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9315 return SemaRef.Diag(FnDecl->getLocation(), 9316 diag::err_operator_new_delete_invalid_result_type) 9317 << FnDecl->getDeclName() << ExpectedResultType; 9318 9319 // A function template must have at least 2 parameters. 9320 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9321 return SemaRef.Diag(FnDecl->getLocation(), 9322 diag::err_operator_new_delete_template_too_few_parameters) 9323 << FnDecl->getDeclName(); 9324 9325 // The function decl must have at least 1 parameter. 9326 if (FnDecl->getNumParams() == 0) 9327 return SemaRef.Diag(FnDecl->getLocation(), 9328 diag::err_operator_new_delete_too_few_parameters) 9329 << FnDecl->getDeclName(); 9330 9331 // Check the the first parameter type is not dependent. 9332 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9333 if (FirstParamType->isDependentType()) 9334 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9335 << FnDecl->getDeclName() << ExpectedFirstParamType; 9336 9337 // Check that the first parameter type is what we expect. 9338 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9339 ExpectedFirstParamType) 9340 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9341 << FnDecl->getDeclName() << ExpectedFirstParamType; 9342 9343 return false; 9344} 9345 9346static bool 9347CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9348 // C++ [basic.stc.dynamic.allocation]p1: 9349 // A program is ill-formed if an allocation function is declared in a 9350 // namespace scope other than global scope or declared static in global 9351 // scope. 9352 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9353 return true; 9354 9355 CanQualType SizeTy = 9356 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9357 9358 // C++ [basic.stc.dynamic.allocation]p1: 9359 // The return type shall be void*. The first parameter shall have type 9360 // std::size_t. 9361 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9362 SizeTy, 9363 diag::err_operator_new_dependent_param_type, 9364 diag::err_operator_new_param_type)) 9365 return true; 9366 9367 // C++ [basic.stc.dynamic.allocation]p1: 9368 // The first parameter shall not have an associated default argument. 9369 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9370 return SemaRef.Diag(FnDecl->getLocation(), 9371 diag::err_operator_new_default_arg) 9372 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9373 9374 return false; 9375} 9376 9377static bool 9378CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9379 // C++ [basic.stc.dynamic.deallocation]p1: 9380 // A program is ill-formed if deallocation functions are declared in a 9381 // namespace scope other than global scope or declared static in global 9382 // scope. 9383 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9384 return true; 9385 9386 // C++ [basic.stc.dynamic.deallocation]p2: 9387 // Each deallocation function shall return void and its first parameter 9388 // shall be void*. 9389 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9390 SemaRef.Context.VoidPtrTy, 9391 diag::err_operator_delete_dependent_param_type, 9392 diag::err_operator_delete_param_type)) 9393 return true; 9394 9395 return false; 9396} 9397 9398/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9399/// of this overloaded operator is well-formed. If so, returns false; 9400/// otherwise, emits appropriate diagnostics and returns true. 9401bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9402 assert(FnDecl && FnDecl->isOverloadedOperator() && 9403 "Expected an overloaded operator declaration"); 9404 9405 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9406 9407 // C++ [over.oper]p5: 9408 // The allocation and deallocation functions, operator new, 9409 // operator new[], operator delete and operator delete[], are 9410 // described completely in 3.7.3. The attributes and restrictions 9411 // found in the rest of this subclause do not apply to them unless 9412 // explicitly stated in 3.7.3. 9413 if (Op == OO_Delete || Op == OO_Array_Delete) 9414 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9415 9416 if (Op == OO_New || Op == OO_Array_New) 9417 return CheckOperatorNewDeclaration(*this, FnDecl); 9418 9419 // C++ [over.oper]p6: 9420 // An operator function shall either be a non-static member 9421 // function or be a non-member function and have at least one 9422 // parameter whose type is a class, a reference to a class, an 9423 // enumeration, or a reference to an enumeration. 9424 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9425 if (MethodDecl->isStatic()) 9426 return Diag(FnDecl->getLocation(), 9427 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9428 } else { 9429 bool ClassOrEnumParam = false; 9430 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9431 ParamEnd = FnDecl->param_end(); 9432 Param != ParamEnd; ++Param) { 9433 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9434 if (ParamType->isDependentType() || ParamType->isRecordType() || 9435 ParamType->isEnumeralType()) { 9436 ClassOrEnumParam = true; 9437 break; 9438 } 9439 } 9440 9441 if (!ClassOrEnumParam) 9442 return Diag(FnDecl->getLocation(), 9443 diag::err_operator_overload_needs_class_or_enum) 9444 << FnDecl->getDeclName(); 9445 } 9446 9447 // C++ [over.oper]p8: 9448 // An operator function cannot have default arguments (8.3.6), 9449 // except where explicitly stated below. 9450 // 9451 // Only the function-call operator allows default arguments 9452 // (C++ [over.call]p1). 9453 if (Op != OO_Call) { 9454 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9455 Param != FnDecl->param_end(); ++Param) { 9456 if ((*Param)->hasDefaultArg()) 9457 return Diag((*Param)->getLocation(), 9458 diag::err_operator_overload_default_arg) 9459 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9460 } 9461 } 9462 9463 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9464 { false, false, false } 9465#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9466 , { Unary, Binary, MemberOnly } 9467#include "clang/Basic/OperatorKinds.def" 9468 }; 9469 9470 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9471 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9472 bool MustBeMemberOperator = OperatorUses[Op][2]; 9473 9474 // C++ [over.oper]p8: 9475 // [...] Operator functions cannot have more or fewer parameters 9476 // than the number required for the corresponding operator, as 9477 // described in the rest of this subclause. 9478 unsigned NumParams = FnDecl->getNumParams() 9479 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9480 if (Op != OO_Call && 9481 ((NumParams == 1 && !CanBeUnaryOperator) || 9482 (NumParams == 2 && !CanBeBinaryOperator) || 9483 (NumParams < 1) || (NumParams > 2))) { 9484 // We have the wrong number of parameters. 9485 unsigned ErrorKind; 9486 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9487 ErrorKind = 2; // 2 -> unary or binary. 9488 } else if (CanBeUnaryOperator) { 9489 ErrorKind = 0; // 0 -> unary 9490 } else { 9491 assert(CanBeBinaryOperator && 9492 "All non-call overloaded operators are unary or binary!"); 9493 ErrorKind = 1; // 1 -> binary 9494 } 9495 9496 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9497 << FnDecl->getDeclName() << NumParams << ErrorKind; 9498 } 9499 9500 // Overloaded operators other than operator() cannot be variadic. 9501 if (Op != OO_Call && 9502 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9503 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9504 << FnDecl->getDeclName(); 9505 } 9506 9507 // Some operators must be non-static member functions. 9508 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9509 return Diag(FnDecl->getLocation(), 9510 diag::err_operator_overload_must_be_member) 9511 << FnDecl->getDeclName(); 9512 } 9513 9514 // C++ [over.inc]p1: 9515 // The user-defined function called operator++ implements the 9516 // prefix and postfix ++ operator. If this function is a member 9517 // function with no parameters, or a non-member function with one 9518 // parameter of class or enumeration type, it defines the prefix 9519 // increment operator ++ for objects of that type. If the function 9520 // is a member function with one parameter (which shall be of type 9521 // int) or a non-member function with two parameters (the second 9522 // of which shall be of type int), it defines the postfix 9523 // increment operator ++ for objects of that type. 9524 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9525 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9526 bool ParamIsInt = false; 9527 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9528 ParamIsInt = BT->getKind() == BuiltinType::Int; 9529 9530 if (!ParamIsInt) 9531 return Diag(LastParam->getLocation(), 9532 diag::err_operator_overload_post_incdec_must_be_int) 9533 << LastParam->getType() << (Op == OO_MinusMinus); 9534 } 9535 9536 return false; 9537} 9538 9539/// CheckLiteralOperatorDeclaration - Check whether the declaration 9540/// of this literal operator function is well-formed. If so, returns 9541/// false; otherwise, emits appropriate diagnostics and returns true. 9542bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9543 if (isa<CXXMethodDecl>(FnDecl)) { 9544 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9545 << FnDecl->getDeclName(); 9546 return true; 9547 } 9548 9549 if (FnDecl->isExternC()) { 9550 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9551 return true; 9552 } 9553 9554 bool Valid = false; 9555 9556 // This might be the definition of a literal operator template. 9557 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9558 // This might be a specialization of a literal operator template. 9559 if (!TpDecl) 9560 TpDecl = FnDecl->getPrimaryTemplate(); 9561 9562 // template <char...> type operator "" name() is the only valid template 9563 // signature, and the only valid signature with no parameters. 9564 if (TpDecl) { 9565 if (FnDecl->param_size() == 0) { 9566 // Must have only one template parameter 9567 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9568 if (Params->size() == 1) { 9569 NonTypeTemplateParmDecl *PmDecl = 9570 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9571 9572 // The template parameter must be a char parameter pack. 9573 if (PmDecl && PmDecl->isTemplateParameterPack() && 9574 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9575 Valid = true; 9576 } 9577 } 9578 } else if (FnDecl->param_size()) { 9579 // Check the first parameter 9580 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9581 9582 QualType T = (*Param)->getType().getUnqualifiedType(); 9583 9584 // unsigned long long int, long double, and any character type are allowed 9585 // as the only parameters. 9586 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9587 Context.hasSameType(T, Context.LongDoubleTy) || 9588 Context.hasSameType(T, Context.CharTy) || 9589 Context.hasSameType(T, Context.WCharTy) || 9590 Context.hasSameType(T, Context.Char16Ty) || 9591 Context.hasSameType(T, Context.Char32Ty)) { 9592 if (++Param == FnDecl->param_end()) 9593 Valid = true; 9594 goto FinishedParams; 9595 } 9596 9597 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9598 const PointerType *PT = T->getAs<PointerType>(); 9599 if (!PT) 9600 goto FinishedParams; 9601 T = PT->getPointeeType(); 9602 if (!T.isConstQualified() || T.isVolatileQualified()) 9603 goto FinishedParams; 9604 T = T.getUnqualifiedType(); 9605 9606 // Move on to the second parameter; 9607 ++Param; 9608 9609 // If there is no second parameter, the first must be a const char * 9610 if (Param == FnDecl->param_end()) { 9611 if (Context.hasSameType(T, Context.CharTy)) 9612 Valid = true; 9613 goto FinishedParams; 9614 } 9615 9616 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9617 // are allowed as the first parameter to a two-parameter function 9618 if (!(Context.hasSameType(T, Context.CharTy) || 9619 Context.hasSameType(T, Context.WCharTy) || 9620 Context.hasSameType(T, Context.Char16Ty) || 9621 Context.hasSameType(T, Context.Char32Ty))) 9622 goto FinishedParams; 9623 9624 // The second and final parameter must be an std::size_t 9625 T = (*Param)->getType().getUnqualifiedType(); 9626 if (Context.hasSameType(T, Context.getSizeType()) && 9627 ++Param == FnDecl->param_end()) 9628 Valid = true; 9629 } 9630 9631 // FIXME: This diagnostic is absolutely terrible. 9632FinishedParams: 9633 if (!Valid) { 9634 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9635 << FnDecl->getDeclName(); 9636 return true; 9637 } 9638 9639 // A parameter-declaration-clause containing a default argument is not 9640 // equivalent to any of the permitted forms. 9641 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9642 ParamEnd = FnDecl->param_end(); 9643 Param != ParamEnd; ++Param) { 9644 if ((*Param)->hasDefaultArg()) { 9645 Diag((*Param)->getDefaultArgRange().getBegin(), 9646 diag::err_literal_operator_default_argument) 9647 << (*Param)->getDefaultArgRange(); 9648 break; 9649 } 9650 } 9651 9652 StringRef LiteralName 9653 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9654 if (LiteralName[0] != '_') { 9655 // C++11 [usrlit.suffix]p1: 9656 // Literal suffix identifiers that do not start with an underscore 9657 // are reserved for future standardization. 9658 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9659 } 9660 9661 return false; 9662} 9663 9664/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9665/// linkage specification, including the language and (if present) 9666/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9667/// the location of the language string literal, which is provided 9668/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9669/// the '{' brace. Otherwise, this linkage specification does not 9670/// have any braces. 9671Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9672 SourceLocation LangLoc, 9673 StringRef Lang, 9674 SourceLocation LBraceLoc) { 9675 LinkageSpecDecl::LanguageIDs Language; 9676 if (Lang == "\"C\"") 9677 Language = LinkageSpecDecl::lang_c; 9678 else if (Lang == "\"C++\"") 9679 Language = LinkageSpecDecl::lang_cxx; 9680 else { 9681 Diag(LangLoc, diag::err_bad_language); 9682 return 0; 9683 } 9684 9685 // FIXME: Add all the various semantics of linkage specifications 9686 9687 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9688 ExternLoc, LangLoc, Language); 9689 CurContext->addDecl(D); 9690 PushDeclContext(S, D); 9691 return D; 9692} 9693 9694/// ActOnFinishLinkageSpecification - Complete the definition of 9695/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9696/// valid, it's the position of the closing '}' brace in a linkage 9697/// specification that uses braces. 9698Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9699 Decl *LinkageSpec, 9700 SourceLocation RBraceLoc) { 9701 if (LinkageSpec) { 9702 if (RBraceLoc.isValid()) { 9703 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9704 LSDecl->setRBraceLoc(RBraceLoc); 9705 } 9706 PopDeclContext(); 9707 } 9708 return LinkageSpec; 9709} 9710 9711/// \brief Perform semantic analysis for the variable declaration that 9712/// occurs within a C++ catch clause, returning the newly-created 9713/// variable. 9714VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9715 TypeSourceInfo *TInfo, 9716 SourceLocation StartLoc, 9717 SourceLocation Loc, 9718 IdentifierInfo *Name) { 9719 bool Invalid = false; 9720 QualType ExDeclType = TInfo->getType(); 9721 9722 // Arrays and functions decay. 9723 if (ExDeclType->isArrayType()) 9724 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9725 else if (ExDeclType->isFunctionType()) 9726 ExDeclType = Context.getPointerType(ExDeclType); 9727 9728 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9729 // The exception-declaration shall not denote a pointer or reference to an 9730 // incomplete type, other than [cv] void*. 9731 // N2844 forbids rvalue references. 9732 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9733 Diag(Loc, diag::err_catch_rvalue_ref); 9734 Invalid = true; 9735 } 9736 9737 QualType BaseType = ExDeclType; 9738 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9739 unsigned DK = diag::err_catch_incomplete; 9740 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9741 BaseType = Ptr->getPointeeType(); 9742 Mode = 1; 9743 DK = diag::err_catch_incomplete_ptr; 9744 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9745 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9746 BaseType = Ref->getPointeeType(); 9747 Mode = 2; 9748 DK = diag::err_catch_incomplete_ref; 9749 } 9750 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9751 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9752 Invalid = true; 9753 9754 if (!Invalid && !ExDeclType->isDependentType() && 9755 RequireNonAbstractType(Loc, ExDeclType, 9756 diag::err_abstract_type_in_decl, 9757 AbstractVariableType)) 9758 Invalid = true; 9759 9760 // Only the non-fragile NeXT runtime currently supports C++ catches 9761 // of ObjC types, and no runtime supports catching ObjC types by value. 9762 if (!Invalid && getLangOpts().ObjC1) { 9763 QualType T = ExDeclType; 9764 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9765 T = RT->getPointeeType(); 9766 9767 if (T->isObjCObjectType()) { 9768 Diag(Loc, diag::err_objc_object_catch); 9769 Invalid = true; 9770 } else if (T->isObjCObjectPointerType()) { 9771 if (!getLangOpts().ObjCNonFragileABI) 9772 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9773 } 9774 } 9775 9776 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9777 ExDeclType, TInfo, SC_None, SC_None); 9778 ExDecl->setExceptionVariable(true); 9779 9780 // In ARC, infer 'retaining' for variables of retainable type. 9781 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9782 Invalid = true; 9783 9784 if (!Invalid && !ExDeclType->isDependentType()) { 9785 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9786 // C++ [except.handle]p16: 9787 // The object declared in an exception-declaration or, if the 9788 // exception-declaration does not specify a name, a temporary (12.2) is 9789 // copy-initialized (8.5) from the exception object. [...] 9790 // The object is destroyed when the handler exits, after the destruction 9791 // of any automatic objects initialized within the handler. 9792 // 9793 // We just pretend to initialize the object with itself, then make sure 9794 // it can be destroyed later. 9795 QualType initType = ExDeclType; 9796 9797 InitializedEntity entity = 9798 InitializedEntity::InitializeVariable(ExDecl); 9799 InitializationKind initKind = 9800 InitializationKind::CreateCopy(Loc, SourceLocation()); 9801 9802 Expr *opaqueValue = 9803 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9804 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9805 ExprResult result = sequence.Perform(*this, entity, initKind, 9806 MultiExprArg(&opaqueValue, 1)); 9807 if (result.isInvalid()) 9808 Invalid = true; 9809 else { 9810 // If the constructor used was non-trivial, set this as the 9811 // "initializer". 9812 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9813 if (!construct->getConstructor()->isTrivial()) { 9814 Expr *init = MaybeCreateExprWithCleanups(construct); 9815 ExDecl->setInit(init); 9816 } 9817 9818 // And make sure it's destructable. 9819 FinalizeVarWithDestructor(ExDecl, recordType); 9820 } 9821 } 9822 } 9823 9824 if (Invalid) 9825 ExDecl->setInvalidDecl(); 9826 9827 return ExDecl; 9828} 9829 9830/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9831/// handler. 9832Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9833 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9834 bool Invalid = D.isInvalidType(); 9835 9836 // Check for unexpanded parameter packs. 9837 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9838 UPPC_ExceptionType)) { 9839 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9840 D.getIdentifierLoc()); 9841 Invalid = true; 9842 } 9843 9844 IdentifierInfo *II = D.getIdentifier(); 9845 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9846 LookupOrdinaryName, 9847 ForRedeclaration)) { 9848 // The scope should be freshly made just for us. There is just no way 9849 // it contains any previous declaration. 9850 assert(!S->isDeclScope(PrevDecl)); 9851 if (PrevDecl->isTemplateParameter()) { 9852 // Maybe we will complain about the shadowed template parameter. 9853 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9854 PrevDecl = 0; 9855 } 9856 } 9857 9858 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9859 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9860 << D.getCXXScopeSpec().getRange(); 9861 Invalid = true; 9862 } 9863 9864 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9865 D.getLocStart(), 9866 D.getIdentifierLoc(), 9867 D.getIdentifier()); 9868 if (Invalid) 9869 ExDecl->setInvalidDecl(); 9870 9871 // Add the exception declaration into this scope. 9872 if (II) 9873 PushOnScopeChains(ExDecl, S); 9874 else 9875 CurContext->addDecl(ExDecl); 9876 9877 ProcessDeclAttributes(S, ExDecl, D); 9878 return ExDecl; 9879} 9880 9881Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9882 Expr *AssertExpr, 9883 Expr *AssertMessageExpr_, 9884 SourceLocation RParenLoc) { 9885 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9886 9887 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9888 // In a static_assert-declaration, the constant-expression shall be a 9889 // constant expression that can be contextually converted to bool. 9890 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9891 if (Converted.isInvalid()) 9892 return 0; 9893 9894 llvm::APSInt Cond; 9895 if (VerifyIntegerConstantExpression(Converted.get(), &Cond, 9896 PDiag(diag::err_static_assert_expression_is_not_constant), 9897 /*AllowFold=*/false).isInvalid()) 9898 return 0; 9899 9900 if (!Cond) { 9901 llvm::SmallString<256> MsgBuffer; 9902 llvm::raw_svector_ostream Msg(MsgBuffer); 9903 AssertMessage->printPretty(Msg, Context, 0, getPrintingPolicy()); 9904 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9905 << Msg.str() << AssertExpr->getSourceRange(); 9906 } 9907 } 9908 9909 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9910 return 0; 9911 9912 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9913 AssertExpr, AssertMessage, RParenLoc); 9914 9915 CurContext->addDecl(Decl); 9916 return Decl; 9917} 9918 9919/// \brief Perform semantic analysis of the given friend type declaration. 9920/// 9921/// \returns A friend declaration that. 9922FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9923 SourceLocation FriendLoc, 9924 TypeSourceInfo *TSInfo) { 9925 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9926 9927 QualType T = TSInfo->getType(); 9928 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9929 9930 // C++03 [class.friend]p2: 9931 // An elaborated-type-specifier shall be used in a friend declaration 9932 // for a class.* 9933 // 9934 // * The class-key of the elaborated-type-specifier is required. 9935 if (!ActiveTemplateInstantiations.empty()) { 9936 // Do not complain about the form of friend template types during 9937 // template instantiation; we will already have complained when the 9938 // template was declared. 9939 } else if (!T->isElaboratedTypeSpecifier()) { 9940 // If we evaluated the type to a record type, suggest putting 9941 // a tag in front. 9942 if (const RecordType *RT = T->getAs<RecordType>()) { 9943 RecordDecl *RD = RT->getDecl(); 9944 9945 std::string InsertionText = std::string(" ") + RD->getKindName(); 9946 9947 Diag(TypeRange.getBegin(), 9948 getLangOpts().CPlusPlus0x ? 9949 diag::warn_cxx98_compat_unelaborated_friend_type : 9950 diag::ext_unelaborated_friend_type) 9951 << (unsigned) RD->getTagKind() 9952 << T 9953 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9954 InsertionText); 9955 } else { 9956 Diag(FriendLoc, 9957 getLangOpts().CPlusPlus0x ? 9958 diag::warn_cxx98_compat_nonclass_type_friend : 9959 diag::ext_nonclass_type_friend) 9960 << T 9961 << SourceRange(FriendLoc, TypeRange.getEnd()); 9962 } 9963 } else if (T->getAs<EnumType>()) { 9964 Diag(FriendLoc, 9965 getLangOpts().CPlusPlus0x ? 9966 diag::warn_cxx98_compat_enum_friend : 9967 diag::ext_enum_friend) 9968 << T 9969 << SourceRange(FriendLoc, TypeRange.getEnd()); 9970 } 9971 9972 // C++0x [class.friend]p3: 9973 // If the type specifier in a friend declaration designates a (possibly 9974 // cv-qualified) class type, that class is declared as a friend; otherwise, 9975 // the friend declaration is ignored. 9976 9977 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9978 // in [class.friend]p3 that we do not implement. 9979 9980 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9981} 9982 9983/// Handle a friend tag declaration where the scope specifier was 9984/// templated. 9985Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9986 unsigned TagSpec, SourceLocation TagLoc, 9987 CXXScopeSpec &SS, 9988 IdentifierInfo *Name, SourceLocation NameLoc, 9989 AttributeList *Attr, 9990 MultiTemplateParamsArg TempParamLists) { 9991 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9992 9993 bool isExplicitSpecialization = false; 9994 bool Invalid = false; 9995 9996 if (TemplateParameterList *TemplateParams 9997 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9998 TempParamLists.get(), 9999 TempParamLists.size(), 10000 /*friend*/ true, 10001 isExplicitSpecialization, 10002 Invalid)) { 10003 if (TemplateParams->size() > 0) { 10004 // This is a declaration of a class template. 10005 if (Invalid) 10006 return 0; 10007 10008 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 10009 SS, Name, NameLoc, Attr, 10010 TemplateParams, AS_public, 10011 /*ModulePrivateLoc=*/SourceLocation(), 10012 TempParamLists.size() - 1, 10013 (TemplateParameterList**) TempParamLists.release()).take(); 10014 } else { 10015 // The "template<>" header is extraneous. 10016 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 10017 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 10018 isExplicitSpecialization = true; 10019 } 10020 } 10021 10022 if (Invalid) return 0; 10023 10024 bool isAllExplicitSpecializations = true; 10025 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 10026 if (TempParamLists.get()[I]->size()) { 10027 isAllExplicitSpecializations = false; 10028 break; 10029 } 10030 } 10031 10032 // FIXME: don't ignore attributes. 10033 10034 // If it's explicit specializations all the way down, just forget 10035 // about the template header and build an appropriate non-templated 10036 // friend. TODO: for source fidelity, remember the headers. 10037 if (isAllExplicitSpecializations) { 10038 if (SS.isEmpty()) { 10039 bool Owned = false; 10040 bool IsDependent = false; 10041 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 10042 Attr, AS_public, 10043 /*ModulePrivateLoc=*/SourceLocation(), 10044 MultiTemplateParamsArg(), Owned, IsDependent, 10045 /*ScopedEnumKWLoc=*/SourceLocation(), 10046 /*ScopedEnumUsesClassTag=*/false, 10047 /*UnderlyingType=*/TypeResult()); 10048 } 10049 10050 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10051 ElaboratedTypeKeyword Keyword 10052 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10053 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10054 *Name, NameLoc); 10055 if (T.isNull()) 10056 return 0; 10057 10058 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10059 if (isa<DependentNameType>(T)) { 10060 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10061 TL.setElaboratedKeywordLoc(TagLoc); 10062 TL.setQualifierLoc(QualifierLoc); 10063 TL.setNameLoc(NameLoc); 10064 } else { 10065 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 10066 TL.setElaboratedKeywordLoc(TagLoc); 10067 TL.setQualifierLoc(QualifierLoc); 10068 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 10069 } 10070 10071 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10072 TSI, FriendLoc); 10073 Friend->setAccess(AS_public); 10074 CurContext->addDecl(Friend); 10075 return Friend; 10076 } 10077 10078 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10079 10080 10081 10082 // Handle the case of a templated-scope friend class. e.g. 10083 // template <class T> class A<T>::B; 10084 // FIXME: we don't support these right now. 10085 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10086 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10087 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10088 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10089 TL.setElaboratedKeywordLoc(TagLoc); 10090 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10091 TL.setNameLoc(NameLoc); 10092 10093 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10094 TSI, FriendLoc); 10095 Friend->setAccess(AS_public); 10096 Friend->setUnsupportedFriend(true); 10097 CurContext->addDecl(Friend); 10098 return Friend; 10099} 10100 10101 10102/// Handle a friend type declaration. This works in tandem with 10103/// ActOnTag. 10104/// 10105/// Notes on friend class templates: 10106/// 10107/// We generally treat friend class declarations as if they were 10108/// declaring a class. So, for example, the elaborated type specifier 10109/// in a friend declaration is required to obey the restrictions of a 10110/// class-head (i.e. no typedefs in the scope chain), template 10111/// parameters are required to match up with simple template-ids, &c. 10112/// However, unlike when declaring a template specialization, it's 10113/// okay to refer to a template specialization without an empty 10114/// template parameter declaration, e.g. 10115/// friend class A<T>::B<unsigned>; 10116/// We permit this as a special case; if there are any template 10117/// parameters present at all, require proper matching, i.e. 10118/// template <> template <class T> friend class A<int>::B; 10119Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10120 MultiTemplateParamsArg TempParams) { 10121 SourceLocation Loc = DS.getLocStart(); 10122 10123 assert(DS.isFriendSpecified()); 10124 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10125 10126 // Try to convert the decl specifier to a type. This works for 10127 // friend templates because ActOnTag never produces a ClassTemplateDecl 10128 // for a TUK_Friend. 10129 Declarator TheDeclarator(DS, Declarator::MemberContext); 10130 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10131 QualType T = TSI->getType(); 10132 if (TheDeclarator.isInvalidType()) 10133 return 0; 10134 10135 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10136 return 0; 10137 10138 // This is definitely an error in C++98. It's probably meant to 10139 // be forbidden in C++0x, too, but the specification is just 10140 // poorly written. 10141 // 10142 // The problem is with declarations like the following: 10143 // template <T> friend A<T>::foo; 10144 // where deciding whether a class C is a friend or not now hinges 10145 // on whether there exists an instantiation of A that causes 10146 // 'foo' to equal C. There are restrictions on class-heads 10147 // (which we declare (by fiat) elaborated friend declarations to 10148 // be) that makes this tractable. 10149 // 10150 // FIXME: handle "template <> friend class A<T>;", which 10151 // is possibly well-formed? Who even knows? 10152 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10153 Diag(Loc, diag::err_tagless_friend_type_template) 10154 << DS.getSourceRange(); 10155 return 0; 10156 } 10157 10158 // C++98 [class.friend]p1: A friend of a class is a function 10159 // or class that is not a member of the class . . . 10160 // This is fixed in DR77, which just barely didn't make the C++03 10161 // deadline. It's also a very silly restriction that seriously 10162 // affects inner classes and which nobody else seems to implement; 10163 // thus we never diagnose it, not even in -pedantic. 10164 // 10165 // But note that we could warn about it: it's always useless to 10166 // friend one of your own members (it's not, however, worthless to 10167 // friend a member of an arbitrary specialization of your template). 10168 10169 Decl *D; 10170 if (unsigned NumTempParamLists = TempParams.size()) 10171 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10172 NumTempParamLists, 10173 TempParams.release(), 10174 TSI, 10175 DS.getFriendSpecLoc()); 10176 else 10177 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10178 10179 if (!D) 10180 return 0; 10181 10182 D->setAccess(AS_public); 10183 CurContext->addDecl(D); 10184 10185 return D; 10186} 10187 10188Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10189 MultiTemplateParamsArg TemplateParams) { 10190 const DeclSpec &DS = D.getDeclSpec(); 10191 10192 assert(DS.isFriendSpecified()); 10193 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10194 10195 SourceLocation Loc = D.getIdentifierLoc(); 10196 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10197 10198 // C++ [class.friend]p1 10199 // A friend of a class is a function or class.... 10200 // Note that this sees through typedefs, which is intended. 10201 // It *doesn't* see through dependent types, which is correct 10202 // according to [temp.arg.type]p3: 10203 // If a declaration acquires a function type through a 10204 // type dependent on a template-parameter and this causes 10205 // a declaration that does not use the syntactic form of a 10206 // function declarator to have a function type, the program 10207 // is ill-formed. 10208 if (!TInfo->getType()->isFunctionType()) { 10209 Diag(Loc, diag::err_unexpected_friend); 10210 10211 // It might be worthwhile to try to recover by creating an 10212 // appropriate declaration. 10213 return 0; 10214 } 10215 10216 // C++ [namespace.memdef]p3 10217 // - If a friend declaration in a non-local class first declares a 10218 // class or function, the friend class or function is a member 10219 // of the innermost enclosing namespace. 10220 // - The name of the friend is not found by simple name lookup 10221 // until a matching declaration is provided in that namespace 10222 // scope (either before or after the class declaration granting 10223 // friendship). 10224 // - If a friend function is called, its name may be found by the 10225 // name lookup that considers functions from namespaces and 10226 // classes associated with the types of the function arguments. 10227 // - When looking for a prior declaration of a class or a function 10228 // declared as a friend, scopes outside the innermost enclosing 10229 // namespace scope are not considered. 10230 10231 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10232 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10233 DeclarationName Name = NameInfo.getName(); 10234 assert(Name); 10235 10236 // Check for unexpanded parameter packs. 10237 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10238 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10239 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10240 return 0; 10241 10242 // The context we found the declaration in, or in which we should 10243 // create the declaration. 10244 DeclContext *DC; 10245 Scope *DCScope = S; 10246 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10247 ForRedeclaration); 10248 10249 // FIXME: there are different rules in local classes 10250 10251 // There are four cases here. 10252 // - There's no scope specifier, in which case we just go to the 10253 // appropriate scope and look for a function or function template 10254 // there as appropriate. 10255 // Recover from invalid scope qualifiers as if they just weren't there. 10256 if (SS.isInvalid() || !SS.isSet()) { 10257 // C++0x [namespace.memdef]p3: 10258 // If the name in a friend declaration is neither qualified nor 10259 // a template-id and the declaration is a function or an 10260 // elaborated-type-specifier, the lookup to determine whether 10261 // the entity has been previously declared shall not consider 10262 // any scopes outside the innermost enclosing namespace. 10263 // C++0x [class.friend]p11: 10264 // If a friend declaration appears in a local class and the name 10265 // specified is an unqualified name, a prior declaration is 10266 // looked up without considering scopes that are outside the 10267 // innermost enclosing non-class scope. For a friend function 10268 // declaration, if there is no prior declaration, the program is 10269 // ill-formed. 10270 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10271 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10272 10273 // Find the appropriate context according to the above. 10274 DC = CurContext; 10275 while (true) { 10276 // Skip class contexts. If someone can cite chapter and verse 10277 // for this behavior, that would be nice --- it's what GCC and 10278 // EDG do, and it seems like a reasonable intent, but the spec 10279 // really only says that checks for unqualified existing 10280 // declarations should stop at the nearest enclosing namespace, 10281 // not that they should only consider the nearest enclosing 10282 // namespace. 10283 while (DC->isRecord() || DC->isTransparentContext()) 10284 DC = DC->getParent(); 10285 10286 LookupQualifiedName(Previous, DC); 10287 10288 // TODO: decide what we think about using declarations. 10289 if (isLocal || !Previous.empty()) 10290 break; 10291 10292 if (isTemplateId) { 10293 if (isa<TranslationUnitDecl>(DC)) break; 10294 } else { 10295 if (DC->isFileContext()) break; 10296 } 10297 DC = DC->getParent(); 10298 } 10299 10300 // C++ [class.friend]p1: A friend of a class is a function or 10301 // class that is not a member of the class . . . 10302 // C++11 changes this for both friend types and functions. 10303 // Most C++ 98 compilers do seem to give an error here, so 10304 // we do, too. 10305 if (!Previous.empty() && DC->Equals(CurContext)) 10306 Diag(DS.getFriendSpecLoc(), 10307 getLangOpts().CPlusPlus0x ? 10308 diag::warn_cxx98_compat_friend_is_member : 10309 diag::err_friend_is_member); 10310 10311 DCScope = getScopeForDeclContext(S, DC); 10312 10313 // C++ [class.friend]p6: 10314 // A function can be defined in a friend declaration of a class if and 10315 // only if the class is a non-local class (9.8), the function name is 10316 // unqualified, and the function has namespace scope. 10317 if (isLocal && D.isFunctionDefinition()) { 10318 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10319 } 10320 10321 // - There's a non-dependent scope specifier, in which case we 10322 // compute it and do a previous lookup there for a function 10323 // or function template. 10324 } else if (!SS.getScopeRep()->isDependent()) { 10325 DC = computeDeclContext(SS); 10326 if (!DC) return 0; 10327 10328 if (RequireCompleteDeclContext(SS, DC)) return 0; 10329 10330 LookupQualifiedName(Previous, DC); 10331 10332 // Ignore things found implicitly in the wrong scope. 10333 // TODO: better diagnostics for this case. Suggesting the right 10334 // qualified scope would be nice... 10335 LookupResult::Filter F = Previous.makeFilter(); 10336 while (F.hasNext()) { 10337 NamedDecl *D = F.next(); 10338 if (!DC->InEnclosingNamespaceSetOf( 10339 D->getDeclContext()->getRedeclContext())) 10340 F.erase(); 10341 } 10342 F.done(); 10343 10344 if (Previous.empty()) { 10345 D.setInvalidType(); 10346 Diag(Loc, diag::err_qualified_friend_not_found) 10347 << Name << TInfo->getType(); 10348 return 0; 10349 } 10350 10351 // C++ [class.friend]p1: A friend of a class is a function or 10352 // class that is not a member of the class . . . 10353 if (DC->Equals(CurContext)) 10354 Diag(DS.getFriendSpecLoc(), 10355 getLangOpts().CPlusPlus0x ? 10356 diag::warn_cxx98_compat_friend_is_member : 10357 diag::err_friend_is_member); 10358 10359 if (D.isFunctionDefinition()) { 10360 // C++ [class.friend]p6: 10361 // A function can be defined in a friend declaration of a class if and 10362 // only if the class is a non-local class (9.8), the function name is 10363 // unqualified, and the function has namespace scope. 10364 SemaDiagnosticBuilder DB 10365 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10366 10367 DB << SS.getScopeRep(); 10368 if (DC->isFileContext()) 10369 DB << FixItHint::CreateRemoval(SS.getRange()); 10370 SS.clear(); 10371 } 10372 10373 // - There's a scope specifier that does not match any template 10374 // parameter lists, in which case we use some arbitrary context, 10375 // create a method or method template, and wait for instantiation. 10376 // - There's a scope specifier that does match some template 10377 // parameter lists, which we don't handle right now. 10378 } else { 10379 if (D.isFunctionDefinition()) { 10380 // C++ [class.friend]p6: 10381 // A function can be defined in a friend declaration of a class if and 10382 // only if the class is a non-local class (9.8), the function name is 10383 // unqualified, and the function has namespace scope. 10384 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10385 << SS.getScopeRep(); 10386 } 10387 10388 DC = CurContext; 10389 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10390 } 10391 10392 if (!DC->isRecord()) { 10393 // This implies that it has to be an operator or function. 10394 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10395 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10396 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10397 Diag(Loc, diag::err_introducing_special_friend) << 10398 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10399 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10400 return 0; 10401 } 10402 } 10403 10404 // FIXME: This is an egregious hack to cope with cases where the scope stack 10405 // does not contain the declaration context, i.e., in an out-of-line 10406 // definition of a class. 10407 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10408 if (!DCScope) { 10409 FakeDCScope.setEntity(DC); 10410 DCScope = &FakeDCScope; 10411 } 10412 10413 bool AddToScope = true; 10414 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10415 move(TemplateParams), AddToScope); 10416 if (!ND) return 0; 10417 10418 assert(ND->getDeclContext() == DC); 10419 assert(ND->getLexicalDeclContext() == CurContext); 10420 10421 // Add the function declaration to the appropriate lookup tables, 10422 // adjusting the redeclarations list as necessary. We don't 10423 // want to do this yet if the friending class is dependent. 10424 // 10425 // Also update the scope-based lookup if the target context's 10426 // lookup context is in lexical scope. 10427 if (!CurContext->isDependentContext()) { 10428 DC = DC->getRedeclContext(); 10429 DC->makeDeclVisibleInContext(ND); 10430 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10431 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10432 } 10433 10434 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10435 D.getIdentifierLoc(), ND, 10436 DS.getFriendSpecLoc()); 10437 FrD->setAccess(AS_public); 10438 CurContext->addDecl(FrD); 10439 10440 if (ND->isInvalidDecl()) 10441 FrD->setInvalidDecl(); 10442 else { 10443 FunctionDecl *FD; 10444 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10445 FD = FTD->getTemplatedDecl(); 10446 else 10447 FD = cast<FunctionDecl>(ND); 10448 10449 // Mark templated-scope function declarations as unsupported. 10450 if (FD->getNumTemplateParameterLists()) 10451 FrD->setUnsupportedFriend(true); 10452 } 10453 10454 return ND; 10455} 10456 10457void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10458 AdjustDeclIfTemplate(Dcl); 10459 10460 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10461 if (!Fn) { 10462 Diag(DelLoc, diag::err_deleted_non_function); 10463 return; 10464 } 10465 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10466 Diag(DelLoc, diag::err_deleted_decl_not_first); 10467 Diag(Prev->getLocation(), diag::note_previous_declaration); 10468 // If the declaration wasn't the first, we delete the function anyway for 10469 // recovery. 10470 } 10471 Fn->setDeletedAsWritten(); 10472 10473 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10474 if (!MD) 10475 return; 10476 10477 // A deleted special member function is trivial if the corresponding 10478 // implicitly-declared function would have been. 10479 switch (getSpecialMember(MD)) { 10480 case CXXInvalid: 10481 break; 10482 case CXXDefaultConstructor: 10483 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10484 break; 10485 case CXXCopyConstructor: 10486 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10487 break; 10488 case CXXMoveConstructor: 10489 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10490 break; 10491 case CXXCopyAssignment: 10492 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10493 break; 10494 case CXXMoveAssignment: 10495 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10496 break; 10497 case CXXDestructor: 10498 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10499 break; 10500 } 10501} 10502 10503void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10504 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10505 10506 if (MD) { 10507 if (MD->getParent()->isDependentType()) { 10508 MD->setDefaulted(); 10509 MD->setExplicitlyDefaulted(); 10510 return; 10511 } 10512 10513 CXXSpecialMember Member = getSpecialMember(MD); 10514 if (Member == CXXInvalid) { 10515 Diag(DefaultLoc, diag::err_default_special_members); 10516 return; 10517 } 10518 10519 MD->setDefaulted(); 10520 MD->setExplicitlyDefaulted(); 10521 10522 // If this definition appears within the record, do the checking when 10523 // the record is complete. 10524 const FunctionDecl *Primary = MD; 10525 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10526 // Find the uninstantiated declaration that actually had the '= default' 10527 // on it. 10528 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10529 10530 if (Primary == Primary->getCanonicalDecl()) 10531 return; 10532 10533 switch (Member) { 10534 case CXXDefaultConstructor: { 10535 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10536 CheckExplicitlyDefaultedDefaultConstructor(CD); 10537 if (!CD->isInvalidDecl()) 10538 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10539 break; 10540 } 10541 10542 case CXXCopyConstructor: { 10543 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10544 CheckExplicitlyDefaultedCopyConstructor(CD); 10545 if (!CD->isInvalidDecl()) 10546 DefineImplicitCopyConstructor(DefaultLoc, CD); 10547 break; 10548 } 10549 10550 case CXXCopyAssignment: { 10551 CheckExplicitlyDefaultedCopyAssignment(MD); 10552 if (!MD->isInvalidDecl()) 10553 DefineImplicitCopyAssignment(DefaultLoc, MD); 10554 break; 10555 } 10556 10557 case CXXDestructor: { 10558 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10559 CheckExplicitlyDefaultedDestructor(DD); 10560 if (!DD->isInvalidDecl()) 10561 DefineImplicitDestructor(DefaultLoc, DD); 10562 break; 10563 } 10564 10565 case CXXMoveConstructor: { 10566 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10567 CheckExplicitlyDefaultedMoveConstructor(CD); 10568 if (!CD->isInvalidDecl()) 10569 DefineImplicitMoveConstructor(DefaultLoc, CD); 10570 break; 10571 } 10572 10573 case CXXMoveAssignment: { 10574 CheckExplicitlyDefaultedMoveAssignment(MD); 10575 if (!MD->isInvalidDecl()) 10576 DefineImplicitMoveAssignment(DefaultLoc, MD); 10577 break; 10578 } 10579 10580 case CXXInvalid: 10581 llvm_unreachable("Invalid special member."); 10582 } 10583 } else { 10584 Diag(DefaultLoc, diag::err_default_special_members); 10585 } 10586} 10587 10588static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10589 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10590 Stmt *SubStmt = *CI; 10591 if (!SubStmt) 10592 continue; 10593 if (isa<ReturnStmt>(SubStmt)) 10594 Self.Diag(SubStmt->getLocStart(), 10595 diag::err_return_in_constructor_handler); 10596 if (!isa<Expr>(SubStmt)) 10597 SearchForReturnInStmt(Self, SubStmt); 10598 } 10599} 10600 10601void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10602 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10603 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10604 SearchForReturnInStmt(*this, Handler); 10605 } 10606} 10607 10608bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10609 const CXXMethodDecl *Old) { 10610 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10611 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10612 10613 if (Context.hasSameType(NewTy, OldTy) || 10614 NewTy->isDependentType() || OldTy->isDependentType()) 10615 return false; 10616 10617 // Check if the return types are covariant 10618 QualType NewClassTy, OldClassTy; 10619 10620 /// Both types must be pointers or references to classes. 10621 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10622 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10623 NewClassTy = NewPT->getPointeeType(); 10624 OldClassTy = OldPT->getPointeeType(); 10625 } 10626 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10627 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10628 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10629 NewClassTy = NewRT->getPointeeType(); 10630 OldClassTy = OldRT->getPointeeType(); 10631 } 10632 } 10633 } 10634 10635 // The return types aren't either both pointers or references to a class type. 10636 if (NewClassTy.isNull()) { 10637 Diag(New->getLocation(), 10638 diag::err_different_return_type_for_overriding_virtual_function) 10639 << New->getDeclName() << NewTy << OldTy; 10640 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10641 10642 return true; 10643 } 10644 10645 // C++ [class.virtual]p6: 10646 // If the return type of D::f differs from the return type of B::f, the 10647 // class type in the return type of D::f shall be complete at the point of 10648 // declaration of D::f or shall be the class type D. 10649 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10650 if (!RT->isBeingDefined() && 10651 RequireCompleteType(New->getLocation(), NewClassTy, 10652 diag::err_covariant_return_incomplete, 10653 New->getDeclName())) 10654 return true; 10655 } 10656 10657 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10658 // Check if the new class derives from the old class. 10659 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10660 Diag(New->getLocation(), 10661 diag::err_covariant_return_not_derived) 10662 << New->getDeclName() << NewTy << OldTy; 10663 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10664 return true; 10665 } 10666 10667 // Check if we the conversion from derived to base is valid. 10668 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10669 diag::err_covariant_return_inaccessible_base, 10670 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10671 // FIXME: Should this point to the return type? 10672 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10673 // FIXME: this note won't trigger for delayed access control 10674 // diagnostics, and it's impossible to get an undelayed error 10675 // here from access control during the original parse because 10676 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10677 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10678 return true; 10679 } 10680 } 10681 10682 // The qualifiers of the return types must be the same. 10683 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10684 Diag(New->getLocation(), 10685 diag::err_covariant_return_type_different_qualifications) 10686 << New->getDeclName() << NewTy << OldTy; 10687 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10688 return true; 10689 }; 10690 10691 10692 // The new class type must have the same or less qualifiers as the old type. 10693 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10694 Diag(New->getLocation(), 10695 diag::err_covariant_return_type_class_type_more_qualified) 10696 << New->getDeclName() << NewTy << OldTy; 10697 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10698 return true; 10699 }; 10700 10701 return false; 10702} 10703 10704/// \brief Mark the given method pure. 10705/// 10706/// \param Method the method to be marked pure. 10707/// 10708/// \param InitRange the source range that covers the "0" initializer. 10709bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10710 SourceLocation EndLoc = InitRange.getEnd(); 10711 if (EndLoc.isValid()) 10712 Method->setRangeEnd(EndLoc); 10713 10714 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10715 Method->setPure(); 10716 return false; 10717 } 10718 10719 if (!Method->isInvalidDecl()) 10720 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10721 << Method->getDeclName() << InitRange; 10722 return true; 10723} 10724 10725/// \brief Determine whether the given declaration is a static data member. 10726static bool isStaticDataMember(Decl *D) { 10727 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10728 if (!Var) 10729 return false; 10730 10731 return Var->isStaticDataMember(); 10732} 10733/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10734/// an initializer for the out-of-line declaration 'Dcl'. The scope 10735/// is a fresh scope pushed for just this purpose. 10736/// 10737/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10738/// static data member of class X, names should be looked up in the scope of 10739/// class X. 10740void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10741 // If there is no declaration, there was an error parsing it. 10742 if (D == 0 || D->isInvalidDecl()) return; 10743 10744 // We should only get called for declarations with scope specifiers, like: 10745 // int foo::bar; 10746 assert(D->isOutOfLine()); 10747 EnterDeclaratorContext(S, D->getDeclContext()); 10748 10749 // If we are parsing the initializer for a static data member, push a 10750 // new expression evaluation context that is associated with this static 10751 // data member. 10752 if (isStaticDataMember(D)) 10753 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10754} 10755 10756/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10757/// initializer for the out-of-line declaration 'D'. 10758void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10759 // If there is no declaration, there was an error parsing it. 10760 if (D == 0 || D->isInvalidDecl()) return; 10761 10762 if (isStaticDataMember(D)) 10763 PopExpressionEvaluationContext(); 10764 10765 assert(D->isOutOfLine()); 10766 ExitDeclaratorContext(S); 10767} 10768 10769/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10770/// C++ if/switch/while/for statement. 10771/// e.g: "if (int x = f()) {...}" 10772DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10773 // C++ 6.4p2: 10774 // The declarator shall not specify a function or an array. 10775 // The type-specifier-seq shall not contain typedef and shall not declare a 10776 // new class or enumeration. 10777 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10778 "Parser allowed 'typedef' as storage class of condition decl."); 10779 10780 Decl *Dcl = ActOnDeclarator(S, D); 10781 if (!Dcl) 10782 return true; 10783 10784 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10785 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10786 << D.getSourceRange(); 10787 return true; 10788 } 10789 10790 return Dcl; 10791} 10792 10793void Sema::LoadExternalVTableUses() { 10794 if (!ExternalSource) 10795 return; 10796 10797 SmallVector<ExternalVTableUse, 4> VTables; 10798 ExternalSource->ReadUsedVTables(VTables); 10799 SmallVector<VTableUse, 4> NewUses; 10800 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10801 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10802 = VTablesUsed.find(VTables[I].Record); 10803 // Even if a definition wasn't required before, it may be required now. 10804 if (Pos != VTablesUsed.end()) { 10805 if (!Pos->second && VTables[I].DefinitionRequired) 10806 Pos->second = true; 10807 continue; 10808 } 10809 10810 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10811 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10812 } 10813 10814 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10815} 10816 10817void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10818 bool DefinitionRequired) { 10819 // Ignore any vtable uses in unevaluated operands or for classes that do 10820 // not have a vtable. 10821 if (!Class->isDynamicClass() || Class->isDependentContext() || 10822 CurContext->isDependentContext() || 10823 ExprEvalContexts.back().Context == Unevaluated) 10824 return; 10825 10826 // Try to insert this class into the map. 10827 LoadExternalVTableUses(); 10828 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10829 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10830 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10831 if (!Pos.second) { 10832 // If we already had an entry, check to see if we are promoting this vtable 10833 // to required a definition. If so, we need to reappend to the VTableUses 10834 // list, since we may have already processed the first entry. 10835 if (DefinitionRequired && !Pos.first->second) { 10836 Pos.first->second = true; 10837 } else { 10838 // Otherwise, we can early exit. 10839 return; 10840 } 10841 } 10842 10843 // Local classes need to have their virtual members marked 10844 // immediately. For all other classes, we mark their virtual members 10845 // at the end of the translation unit. 10846 if (Class->isLocalClass()) 10847 MarkVirtualMembersReferenced(Loc, Class); 10848 else 10849 VTableUses.push_back(std::make_pair(Class, Loc)); 10850} 10851 10852bool Sema::DefineUsedVTables() { 10853 LoadExternalVTableUses(); 10854 if (VTableUses.empty()) 10855 return false; 10856 10857 // Note: The VTableUses vector could grow as a result of marking 10858 // the members of a class as "used", so we check the size each 10859 // time through the loop and prefer indices (with are stable) to 10860 // iterators (which are not). 10861 bool DefinedAnything = false; 10862 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10863 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10864 if (!Class) 10865 continue; 10866 10867 SourceLocation Loc = VTableUses[I].second; 10868 10869 // If this class has a key function, but that key function is 10870 // defined in another translation unit, we don't need to emit the 10871 // vtable even though we're using it. 10872 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10873 if (KeyFunction && !KeyFunction->hasBody()) { 10874 switch (KeyFunction->getTemplateSpecializationKind()) { 10875 case TSK_Undeclared: 10876 case TSK_ExplicitSpecialization: 10877 case TSK_ExplicitInstantiationDeclaration: 10878 // The key function is in another translation unit. 10879 continue; 10880 10881 case TSK_ExplicitInstantiationDefinition: 10882 case TSK_ImplicitInstantiation: 10883 // We will be instantiating the key function. 10884 break; 10885 } 10886 } else if (!KeyFunction) { 10887 // If we have a class with no key function that is the subject 10888 // of an explicit instantiation declaration, suppress the 10889 // vtable; it will live with the explicit instantiation 10890 // definition. 10891 bool IsExplicitInstantiationDeclaration 10892 = Class->getTemplateSpecializationKind() 10893 == TSK_ExplicitInstantiationDeclaration; 10894 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10895 REnd = Class->redecls_end(); 10896 R != REnd; ++R) { 10897 TemplateSpecializationKind TSK 10898 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10899 if (TSK == TSK_ExplicitInstantiationDeclaration) 10900 IsExplicitInstantiationDeclaration = true; 10901 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10902 IsExplicitInstantiationDeclaration = false; 10903 break; 10904 } 10905 } 10906 10907 if (IsExplicitInstantiationDeclaration) 10908 continue; 10909 } 10910 10911 // Mark all of the virtual members of this class as referenced, so 10912 // that we can build a vtable. Then, tell the AST consumer that a 10913 // vtable for this class is required. 10914 DefinedAnything = true; 10915 MarkVirtualMembersReferenced(Loc, Class); 10916 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10917 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10918 10919 // Optionally warn if we're emitting a weak vtable. 10920 if (Class->getLinkage() == ExternalLinkage && 10921 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10922 const FunctionDecl *KeyFunctionDef = 0; 10923 if (!KeyFunction || 10924 (KeyFunction->hasBody(KeyFunctionDef) && 10925 KeyFunctionDef->isInlined())) 10926 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10927 TSK_ExplicitInstantiationDefinition 10928 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10929 << Class; 10930 } 10931 } 10932 VTableUses.clear(); 10933 10934 return DefinedAnything; 10935} 10936 10937void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10938 const CXXRecordDecl *RD) { 10939 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10940 e = RD->method_end(); i != e; ++i) { 10941 CXXMethodDecl *MD = &*i; 10942 10943 // C++ [basic.def.odr]p2: 10944 // [...] A virtual member function is used if it is not pure. [...] 10945 if (MD->isVirtual() && !MD->isPure()) 10946 MarkFunctionReferenced(Loc, MD); 10947 } 10948 10949 // Only classes that have virtual bases need a VTT. 10950 if (RD->getNumVBases() == 0) 10951 return; 10952 10953 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10954 e = RD->bases_end(); i != e; ++i) { 10955 const CXXRecordDecl *Base = 10956 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10957 if (Base->getNumVBases() == 0) 10958 continue; 10959 MarkVirtualMembersReferenced(Loc, Base); 10960 } 10961} 10962 10963/// SetIvarInitializers - This routine builds initialization ASTs for the 10964/// Objective-C implementation whose ivars need be initialized. 10965void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10966 if (!getLangOpts().CPlusPlus) 10967 return; 10968 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10969 SmallVector<ObjCIvarDecl*, 8> ivars; 10970 CollectIvarsToConstructOrDestruct(OID, ivars); 10971 if (ivars.empty()) 10972 return; 10973 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10974 for (unsigned i = 0; i < ivars.size(); i++) { 10975 FieldDecl *Field = ivars[i]; 10976 if (Field->isInvalidDecl()) 10977 continue; 10978 10979 CXXCtorInitializer *Member; 10980 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10981 InitializationKind InitKind = 10982 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10983 10984 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10985 ExprResult MemberInit = 10986 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10987 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10988 // Note, MemberInit could actually come back empty if no initialization 10989 // is required (e.g., because it would call a trivial default constructor) 10990 if (!MemberInit.get() || MemberInit.isInvalid()) 10991 continue; 10992 10993 Member = 10994 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10995 SourceLocation(), 10996 MemberInit.takeAs<Expr>(), 10997 SourceLocation()); 10998 AllToInit.push_back(Member); 10999 11000 // Be sure that the destructor is accessible and is marked as referenced. 11001 if (const RecordType *RecordTy 11002 = Context.getBaseElementType(Field->getType()) 11003 ->getAs<RecordType>()) { 11004 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 11005 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 11006 MarkFunctionReferenced(Field->getLocation(), Destructor); 11007 CheckDestructorAccess(Field->getLocation(), Destructor, 11008 PDiag(diag::err_access_dtor_ivar) 11009 << Context.getBaseElementType(Field->getType())); 11010 } 11011 } 11012 } 11013 ObjCImplementation->setIvarInitializers(Context, 11014 AllToInit.data(), AllToInit.size()); 11015 } 11016} 11017 11018static 11019void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 11020 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 11021 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 11022 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 11023 Sema &S) { 11024 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11025 CE = Current.end(); 11026 if (Ctor->isInvalidDecl()) 11027 return; 11028 11029 const FunctionDecl *FNTarget = 0; 11030 CXXConstructorDecl *Target; 11031 11032 // We ignore the result here since if we don't have a body, Target will be 11033 // null below. 11034 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 11035 Target 11036= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 11037 11038 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 11039 // Avoid dereferencing a null pointer here. 11040 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 11041 11042 if (!Current.insert(Canonical)) 11043 return; 11044 11045 // We know that beyond here, we aren't chaining into a cycle. 11046 if (!Target || !Target->isDelegatingConstructor() || 11047 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11048 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11049 Valid.insert(*CI); 11050 Current.clear(); 11051 // We've hit a cycle. 11052 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11053 Current.count(TCanonical)) { 11054 // If we haven't diagnosed this cycle yet, do so now. 11055 if (!Invalid.count(TCanonical)) { 11056 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11057 diag::warn_delegating_ctor_cycle) 11058 << Ctor; 11059 11060 // Don't add a note for a function delegating directo to itself. 11061 if (TCanonical != Canonical) 11062 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11063 11064 CXXConstructorDecl *C = Target; 11065 while (C->getCanonicalDecl() != Canonical) { 11066 (void)C->getTargetConstructor()->hasBody(FNTarget); 11067 assert(FNTarget && "Ctor cycle through bodiless function"); 11068 11069 C 11070 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 11071 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11072 } 11073 } 11074 11075 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11076 Invalid.insert(*CI); 11077 Current.clear(); 11078 } else { 11079 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11080 } 11081} 11082 11083 11084void Sema::CheckDelegatingCtorCycles() { 11085 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11086 11087 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11088 CE = Current.end(); 11089 11090 for (DelegatingCtorDeclsType::iterator 11091 I = DelegatingCtorDecls.begin(ExternalSource), 11092 E = DelegatingCtorDecls.end(); 11093 I != E; ++I) { 11094 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11095 } 11096 11097 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11098 (*CI)->setInvalidDecl(); 11099} 11100 11101namespace { 11102 /// \brief AST visitor that finds references to the 'this' expression. 11103 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11104 Sema &S; 11105 11106 public: 11107 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11108 11109 bool VisitCXXThisExpr(CXXThisExpr *E) { 11110 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11111 << E->isImplicit(); 11112 return false; 11113 } 11114 }; 11115} 11116 11117bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11118 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11119 if (!TSInfo) 11120 return false; 11121 11122 TypeLoc TL = TSInfo->getTypeLoc(); 11123 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11124 if (!ProtoTL) 11125 return false; 11126 11127 // C++11 [expr.prim.general]p3: 11128 // [The expression this] shall not appear before the optional 11129 // cv-qualifier-seq and it shall not appear within the declaration of a 11130 // static member function (although its type and value category are defined 11131 // within a static member function as they are within a non-static member 11132 // function). [ Note: this is because declaration matching does not occur 11133 // until the complete declarator is known. - end note ] 11134 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11135 FindCXXThisExpr Finder(*this); 11136 11137 // If the return type came after the cv-qualifier-seq, check it now. 11138 if (Proto->hasTrailingReturn() && 11139 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 11140 return true; 11141 11142 // Check the exception specification. 11143 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11144 return true; 11145 11146 return checkThisInStaticMemberFunctionAttributes(Method); 11147} 11148 11149bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11150 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11151 if (!TSInfo) 11152 return false; 11153 11154 TypeLoc TL = TSInfo->getTypeLoc(); 11155 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11156 if (!ProtoTL) 11157 return false; 11158 11159 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11160 FindCXXThisExpr Finder(*this); 11161 11162 switch (Proto->getExceptionSpecType()) { 11163 case EST_Uninstantiated: 11164 case EST_BasicNoexcept: 11165 case EST_Delayed: 11166 case EST_DynamicNone: 11167 case EST_MSAny: 11168 case EST_None: 11169 break; 11170 11171 case EST_ComputedNoexcept: 11172 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11173 return true; 11174 11175 case EST_Dynamic: 11176 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11177 EEnd = Proto->exception_end(); 11178 E != EEnd; ++E) { 11179 if (!Finder.TraverseType(*E)) 11180 return true; 11181 } 11182 break; 11183 } 11184 11185 return false; 11186} 11187 11188bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11189 FindCXXThisExpr Finder(*this); 11190 11191 // Check attributes. 11192 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11193 A != AEnd; ++A) { 11194 // FIXME: This should be emitted by tblgen. 11195 Expr *Arg = 0; 11196 ArrayRef<Expr *> Args; 11197 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11198 Arg = G->getArg(); 11199 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11200 Arg = G->getArg(); 11201 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11202 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11203 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11204 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11205 else if (ExclusiveLockFunctionAttr *ELF 11206 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11207 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11208 else if (SharedLockFunctionAttr *SLF 11209 = dyn_cast<SharedLockFunctionAttr>(*A)) 11210 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11211 else if (ExclusiveTrylockFunctionAttr *ETLF 11212 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11213 Arg = ETLF->getSuccessValue(); 11214 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11215 } else if (SharedTrylockFunctionAttr *STLF 11216 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11217 Arg = STLF->getSuccessValue(); 11218 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11219 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11220 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11221 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11222 Arg = LR->getArg(); 11223 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11224 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11225 else if (ExclusiveLocksRequiredAttr *ELR 11226 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11227 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11228 else if (SharedLocksRequiredAttr *SLR 11229 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11230 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11231 11232 if (Arg && !Finder.TraverseStmt(Arg)) 11233 return true; 11234 11235 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11236 if (!Finder.TraverseStmt(Args[I])) 11237 return true; 11238 } 11239 } 11240 11241 return false; 11242} 11243 11244void 11245Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11246 ArrayRef<ParsedType> DynamicExceptions, 11247 ArrayRef<SourceRange> DynamicExceptionRanges, 11248 Expr *NoexceptExpr, 11249 llvm::SmallVectorImpl<QualType> &Exceptions, 11250 FunctionProtoType::ExtProtoInfo &EPI) { 11251 Exceptions.clear(); 11252 EPI.ExceptionSpecType = EST; 11253 if (EST == EST_Dynamic) { 11254 Exceptions.reserve(DynamicExceptions.size()); 11255 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11256 // FIXME: Preserve type source info. 11257 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11258 11259 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11260 collectUnexpandedParameterPacks(ET, Unexpanded); 11261 if (!Unexpanded.empty()) { 11262 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11263 UPPC_ExceptionType, 11264 Unexpanded); 11265 continue; 11266 } 11267 11268 // Check that the type is valid for an exception spec, and 11269 // drop it if not. 11270 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11271 Exceptions.push_back(ET); 11272 } 11273 EPI.NumExceptions = Exceptions.size(); 11274 EPI.Exceptions = Exceptions.data(); 11275 return; 11276 } 11277 11278 if (EST == EST_ComputedNoexcept) { 11279 // If an error occurred, there's no expression here. 11280 if (NoexceptExpr) { 11281 assert((NoexceptExpr->isTypeDependent() || 11282 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11283 Context.BoolTy) && 11284 "Parser should have made sure that the expression is boolean"); 11285 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11286 EPI.ExceptionSpecType = EST_BasicNoexcept; 11287 return; 11288 } 11289 11290 if (!NoexceptExpr->isValueDependent()) 11291 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11292 PDiag(diag::err_noexcept_needs_constant_expression), 11293 /*AllowFold*/ false).take(); 11294 EPI.NoexceptExpr = NoexceptExpr; 11295 } 11296 return; 11297 } 11298} 11299 11300/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11301Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11302 // Implicitly declared functions (e.g. copy constructors) are 11303 // __host__ __device__ 11304 if (D->isImplicit()) 11305 return CFT_HostDevice; 11306 11307 if (D->hasAttr<CUDAGlobalAttr>()) 11308 return CFT_Global; 11309 11310 if (D->hasAttr<CUDADeviceAttr>()) { 11311 if (D->hasAttr<CUDAHostAttr>()) 11312 return CFT_HostDevice; 11313 else 11314 return CFT_Device; 11315 } 11316 11317 return CFT_Host; 11318} 11319 11320bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11321 CUDAFunctionTarget CalleeTarget) { 11322 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11323 // Callable from the device only." 11324 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11325 return true; 11326 11327 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11328 // Callable from the host only." 11329 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11330 // Callable from the host only." 11331 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11332 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11333 return true; 11334 11335 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11336 return true; 11337 11338 return false; 11339} 11340