SemaDeclCXX.cpp revision 238429
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 SemaRef.PDiag(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 PDiag(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 PDiag(diag::err_incomplete_base_class) 1059 << SpecifierRange)) { 1060 Class->setInvalidDecl(); 1061 return 0; 1062 } 1063 1064 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1065 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1066 assert(BaseDecl && "Record type has no declaration"); 1067 BaseDecl = BaseDecl->getDefinition(); 1068 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1069 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1070 assert(CXXBaseDecl && "Base type is not a C++ type"); 1071 1072 // C++ [class]p3: 1073 // If a class is marked final and it appears as a base-type-specifier in 1074 // base-clause, the program is ill-formed. 1075 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1076 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1077 << CXXBaseDecl->getDeclName(); 1078 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1079 << CXXBaseDecl->getDeclName(); 1080 return 0; 1081 } 1082 1083 if (BaseDecl->isInvalidDecl()) 1084 Class->setInvalidDecl(); 1085 1086 // Create the base specifier. 1087 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1088 Class->getTagKind() == TTK_Class, 1089 Access, TInfo, EllipsisLoc); 1090} 1091 1092/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1093/// one entry in the base class list of a class specifier, for 1094/// example: 1095/// class foo : public bar, virtual private baz { 1096/// 'public bar' and 'virtual private baz' are each base-specifiers. 1097BaseResult 1098Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1099 bool Virtual, AccessSpecifier Access, 1100 ParsedType basetype, SourceLocation BaseLoc, 1101 SourceLocation EllipsisLoc) { 1102 if (!classdecl) 1103 return true; 1104 1105 AdjustDeclIfTemplate(classdecl); 1106 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1107 if (!Class) 1108 return true; 1109 1110 TypeSourceInfo *TInfo = 0; 1111 GetTypeFromParser(basetype, &TInfo); 1112 1113 if (EllipsisLoc.isInvalid() && 1114 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1115 UPPC_BaseType)) 1116 return true; 1117 1118 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1119 Virtual, Access, TInfo, 1120 EllipsisLoc)) 1121 return BaseSpec; 1122 1123 return true; 1124} 1125 1126/// \brief Performs the actual work of attaching the given base class 1127/// specifiers to a C++ class. 1128bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1129 unsigned NumBases) { 1130 if (NumBases == 0) 1131 return false; 1132 1133 // Used to keep track of which base types we have already seen, so 1134 // that we can properly diagnose redundant direct base types. Note 1135 // that the key is always the unqualified canonical type of the base 1136 // class. 1137 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1138 1139 // Copy non-redundant base specifiers into permanent storage. 1140 unsigned NumGoodBases = 0; 1141 bool Invalid = false; 1142 for (unsigned idx = 0; idx < NumBases; ++idx) { 1143 QualType NewBaseType 1144 = Context.getCanonicalType(Bases[idx]->getType()); 1145 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1146 1147 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1148 if (KnownBase) { 1149 // C++ [class.mi]p3: 1150 // A class shall not be specified as a direct base class of a 1151 // derived class more than once. 1152 Diag(Bases[idx]->getLocStart(), 1153 diag::err_duplicate_base_class) 1154 << KnownBase->getType() 1155 << Bases[idx]->getSourceRange(); 1156 1157 // Delete the duplicate base class specifier; we're going to 1158 // overwrite its pointer later. 1159 Context.Deallocate(Bases[idx]); 1160 1161 Invalid = true; 1162 } else { 1163 // Okay, add this new base class. 1164 KnownBase = Bases[idx]; 1165 Bases[NumGoodBases++] = Bases[idx]; 1166 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1167 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1168 if (RD->hasAttr<WeakAttr>()) 1169 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1170 } 1171 } 1172 1173 // Attach the remaining base class specifiers to the derived class. 1174 Class->setBases(Bases, NumGoodBases); 1175 1176 // Delete the remaining (good) base class specifiers, since their 1177 // data has been copied into the CXXRecordDecl. 1178 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1179 Context.Deallocate(Bases[idx]); 1180 1181 return Invalid; 1182} 1183 1184/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1185/// class, after checking whether there are any duplicate base 1186/// classes. 1187void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1188 unsigned NumBases) { 1189 if (!ClassDecl || !Bases || !NumBases) 1190 return; 1191 1192 AdjustDeclIfTemplate(ClassDecl); 1193 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1194 (CXXBaseSpecifier**)(Bases), NumBases); 1195} 1196 1197static CXXRecordDecl *GetClassForType(QualType T) { 1198 if (const RecordType *RT = T->getAs<RecordType>()) 1199 return cast<CXXRecordDecl>(RT->getDecl()); 1200 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1201 return ICT->getDecl(); 1202 else 1203 return 0; 1204} 1205 1206/// \brief Determine whether the type \p Derived is a C++ class that is 1207/// derived from the type \p Base. 1208bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1209 if (!getLangOpts().CPlusPlus) 1210 return false; 1211 1212 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1213 if (!DerivedRD) 1214 return false; 1215 1216 CXXRecordDecl *BaseRD = GetClassForType(Base); 1217 if (!BaseRD) 1218 return false; 1219 1220 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1221 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1222} 1223 1224/// \brief Determine whether the type \p Derived is a C++ class that is 1225/// derived from the type \p Base. 1226bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1227 if (!getLangOpts().CPlusPlus) 1228 return false; 1229 1230 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1231 if (!DerivedRD) 1232 return false; 1233 1234 CXXRecordDecl *BaseRD = GetClassForType(Base); 1235 if (!BaseRD) 1236 return false; 1237 1238 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1239} 1240 1241void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1242 CXXCastPath &BasePathArray) { 1243 assert(BasePathArray.empty() && "Base path array must be empty!"); 1244 assert(Paths.isRecordingPaths() && "Must record paths!"); 1245 1246 const CXXBasePath &Path = Paths.front(); 1247 1248 // We first go backward and check if we have a virtual base. 1249 // FIXME: It would be better if CXXBasePath had the base specifier for 1250 // the nearest virtual base. 1251 unsigned Start = 0; 1252 for (unsigned I = Path.size(); I != 0; --I) { 1253 if (Path[I - 1].Base->isVirtual()) { 1254 Start = I - 1; 1255 break; 1256 } 1257 } 1258 1259 // Now add all bases. 1260 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1261 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1262} 1263 1264/// \brief Determine whether the given base path includes a virtual 1265/// base class. 1266bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1267 for (CXXCastPath::const_iterator B = BasePath.begin(), 1268 BEnd = BasePath.end(); 1269 B != BEnd; ++B) 1270 if ((*B)->isVirtual()) 1271 return true; 1272 1273 return false; 1274} 1275 1276/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1277/// conversion (where Derived and Base are class types) is 1278/// well-formed, meaning that the conversion is unambiguous (and 1279/// that all of the base classes are accessible). Returns true 1280/// and emits a diagnostic if the code is ill-formed, returns false 1281/// otherwise. Loc is the location where this routine should point to 1282/// if there is an error, and Range is the source range to highlight 1283/// if there is an error. 1284bool 1285Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1286 unsigned InaccessibleBaseID, 1287 unsigned AmbigiousBaseConvID, 1288 SourceLocation Loc, SourceRange Range, 1289 DeclarationName Name, 1290 CXXCastPath *BasePath) { 1291 // First, determine whether the path from Derived to Base is 1292 // ambiguous. This is slightly more expensive than checking whether 1293 // the Derived to Base conversion exists, because here we need to 1294 // explore multiple paths to determine if there is an ambiguity. 1295 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1296 /*DetectVirtual=*/false); 1297 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1298 assert(DerivationOkay && 1299 "Can only be used with a derived-to-base conversion"); 1300 (void)DerivationOkay; 1301 1302 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1303 if (InaccessibleBaseID) { 1304 // Check that the base class can be accessed. 1305 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1306 InaccessibleBaseID)) { 1307 case AR_inaccessible: 1308 return true; 1309 case AR_accessible: 1310 case AR_dependent: 1311 case AR_delayed: 1312 break; 1313 } 1314 } 1315 1316 // Build a base path if necessary. 1317 if (BasePath) 1318 BuildBasePathArray(Paths, *BasePath); 1319 return false; 1320 } 1321 1322 // We know that the derived-to-base conversion is ambiguous, and 1323 // we're going to produce a diagnostic. Perform the derived-to-base 1324 // search just one more time to compute all of the possible paths so 1325 // that we can print them out. This is more expensive than any of 1326 // the previous derived-to-base checks we've done, but at this point 1327 // performance isn't as much of an issue. 1328 Paths.clear(); 1329 Paths.setRecordingPaths(true); 1330 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1331 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1332 (void)StillOkay; 1333 1334 // Build up a textual representation of the ambiguous paths, e.g., 1335 // D -> B -> A, that will be used to illustrate the ambiguous 1336 // conversions in the diagnostic. We only print one of the paths 1337 // to each base class subobject. 1338 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1339 1340 Diag(Loc, AmbigiousBaseConvID) 1341 << Derived << Base << PathDisplayStr << Range << Name; 1342 return true; 1343} 1344 1345bool 1346Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1347 SourceLocation Loc, SourceRange Range, 1348 CXXCastPath *BasePath, 1349 bool IgnoreAccess) { 1350 return CheckDerivedToBaseConversion(Derived, Base, 1351 IgnoreAccess ? 0 1352 : diag::err_upcast_to_inaccessible_base, 1353 diag::err_ambiguous_derived_to_base_conv, 1354 Loc, Range, DeclarationName(), 1355 BasePath); 1356} 1357 1358 1359/// @brief Builds a string representing ambiguous paths from a 1360/// specific derived class to different subobjects of the same base 1361/// class. 1362/// 1363/// This function builds a string that can be used in error messages 1364/// to show the different paths that one can take through the 1365/// inheritance hierarchy to go from the derived class to different 1366/// subobjects of a base class. The result looks something like this: 1367/// @code 1368/// struct D -> struct B -> struct A 1369/// struct D -> struct C -> struct A 1370/// @endcode 1371std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1372 std::string PathDisplayStr; 1373 std::set<unsigned> DisplayedPaths; 1374 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1375 Path != Paths.end(); ++Path) { 1376 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1377 // We haven't displayed a path to this particular base 1378 // class subobject yet. 1379 PathDisplayStr += "\n "; 1380 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1381 for (CXXBasePath::const_iterator Element = Path->begin(); 1382 Element != Path->end(); ++Element) 1383 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1384 } 1385 } 1386 1387 return PathDisplayStr; 1388} 1389 1390//===----------------------------------------------------------------------===// 1391// C++ class member Handling 1392//===----------------------------------------------------------------------===// 1393 1394/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1395bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1396 SourceLocation ASLoc, 1397 SourceLocation ColonLoc, 1398 AttributeList *Attrs) { 1399 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1400 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1401 ASLoc, ColonLoc); 1402 CurContext->addHiddenDecl(ASDecl); 1403 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1404} 1405 1406/// CheckOverrideControl - Check C++0x override control semantics. 1407void Sema::CheckOverrideControl(const Decl *D) { 1408 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1409 if (!MD || !MD->isVirtual()) 1410 return; 1411 1412 if (MD->isDependentContext()) 1413 return; 1414 1415 // C++0x [class.virtual]p3: 1416 // If a virtual function is marked with the virt-specifier override and does 1417 // not override a member function of a base class, 1418 // the program is ill-formed. 1419 bool HasOverriddenMethods = 1420 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1421 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1422 Diag(MD->getLocation(), 1423 diag::err_function_marked_override_not_overriding) 1424 << MD->getDeclName(); 1425 return; 1426 } 1427} 1428 1429/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1430/// function overrides a virtual member function marked 'final', according to 1431/// C++0x [class.virtual]p3. 1432bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1433 const CXXMethodDecl *Old) { 1434 if (!Old->hasAttr<FinalAttr>()) 1435 return false; 1436 1437 Diag(New->getLocation(), diag::err_final_function_overridden) 1438 << New->getDeclName(); 1439 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1440 return true; 1441} 1442 1443/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1444/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1445/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1446/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1447/// present but parsing it has been deferred. 1448Decl * 1449Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1450 MultiTemplateParamsArg TemplateParameterLists, 1451 Expr *BW, const VirtSpecifiers &VS, 1452 bool HasDeferredInit) { 1453 const DeclSpec &DS = D.getDeclSpec(); 1454 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1455 DeclarationName Name = NameInfo.getName(); 1456 SourceLocation Loc = NameInfo.getLoc(); 1457 1458 // For anonymous bitfields, the location should point to the type. 1459 if (Loc.isInvalid()) 1460 Loc = D.getLocStart(); 1461 1462 Expr *BitWidth = static_cast<Expr*>(BW); 1463 1464 assert(isa<CXXRecordDecl>(CurContext)); 1465 assert(!DS.isFriendSpecified()); 1466 1467 bool isFunc = D.isDeclarationOfFunction(); 1468 1469 // C++ 9.2p6: A member shall not be declared to have automatic storage 1470 // duration (auto, register) or with the extern storage-class-specifier. 1471 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1472 // data members and cannot be applied to names declared const or static, 1473 // and cannot be applied to reference members. 1474 switch (DS.getStorageClassSpec()) { 1475 case DeclSpec::SCS_unspecified: 1476 case DeclSpec::SCS_typedef: 1477 case DeclSpec::SCS_static: 1478 // FALL THROUGH. 1479 break; 1480 case DeclSpec::SCS_mutable: 1481 if (isFunc) { 1482 if (DS.getStorageClassSpecLoc().isValid()) 1483 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1484 else 1485 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1486 1487 // FIXME: It would be nicer if the keyword was ignored only for this 1488 // declarator. Otherwise we could get follow-up errors. 1489 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1490 } 1491 break; 1492 default: 1493 if (DS.getStorageClassSpecLoc().isValid()) 1494 Diag(DS.getStorageClassSpecLoc(), 1495 diag::err_storageclass_invalid_for_member); 1496 else 1497 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1498 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1499 } 1500 1501 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1502 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1503 !isFunc); 1504 1505 Decl *Member; 1506 if (isInstField) { 1507 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1508 1509 // Data members must have identifiers for names. 1510 if (Name.getNameKind() != DeclarationName::Identifier) { 1511 Diag(Loc, diag::err_bad_variable_name) 1512 << Name; 1513 return 0; 1514 } 1515 1516 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1517 1518 // Member field could not be with "template" keyword. 1519 // So TemplateParameterLists should be empty in this case. 1520 if (TemplateParameterLists.size()) { 1521 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1522 if (TemplateParams->size()) { 1523 // There is no such thing as a member field template. 1524 Diag(D.getIdentifierLoc(), diag::err_template_member) 1525 << II 1526 << SourceRange(TemplateParams->getTemplateLoc(), 1527 TemplateParams->getRAngleLoc()); 1528 } else { 1529 // There is an extraneous 'template<>' for this member. 1530 Diag(TemplateParams->getTemplateLoc(), 1531 diag::err_template_member_noparams) 1532 << II 1533 << SourceRange(TemplateParams->getTemplateLoc(), 1534 TemplateParams->getRAngleLoc()); 1535 } 1536 return 0; 1537 } 1538 1539 if (SS.isSet() && !SS.isInvalid()) { 1540 // The user provided a superfluous scope specifier inside a class 1541 // definition: 1542 // 1543 // class X { 1544 // int X::member; 1545 // }; 1546 if (DeclContext *DC = computeDeclContext(SS, false)) 1547 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1548 else 1549 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1550 << Name << SS.getRange(); 1551 1552 SS.clear(); 1553 } 1554 1555 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1556 HasDeferredInit, AS); 1557 assert(Member && "HandleField never returns null"); 1558 } else { 1559 assert(!HasDeferredInit); 1560 1561 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1562 if (!Member) { 1563 return 0; 1564 } 1565 1566 // Non-instance-fields can't have a bitfield. 1567 if (BitWidth) { 1568 if (Member->isInvalidDecl()) { 1569 // don't emit another diagnostic. 1570 } else if (isa<VarDecl>(Member)) { 1571 // C++ 9.6p3: A bit-field shall not be a static member. 1572 // "static member 'A' cannot be a bit-field" 1573 Diag(Loc, diag::err_static_not_bitfield) 1574 << Name << BitWidth->getSourceRange(); 1575 } else if (isa<TypedefDecl>(Member)) { 1576 // "typedef member 'x' cannot be a bit-field" 1577 Diag(Loc, diag::err_typedef_not_bitfield) 1578 << Name << BitWidth->getSourceRange(); 1579 } else { 1580 // A function typedef ("typedef int f(); f a;"). 1581 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1582 Diag(Loc, diag::err_not_integral_type_bitfield) 1583 << Name << cast<ValueDecl>(Member)->getType() 1584 << BitWidth->getSourceRange(); 1585 } 1586 1587 BitWidth = 0; 1588 Member->setInvalidDecl(); 1589 } 1590 1591 Member->setAccess(AS); 1592 1593 // If we have declared a member function template, set the access of the 1594 // templated declaration as well. 1595 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1596 FunTmpl->getTemplatedDecl()->setAccess(AS); 1597 } 1598 1599 if (VS.isOverrideSpecified()) { 1600 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1601 if (!MD || !MD->isVirtual()) { 1602 Diag(Member->getLocStart(), 1603 diag::override_keyword_only_allowed_on_virtual_member_functions) 1604 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1605 } else 1606 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1607 } 1608 if (VS.isFinalSpecified()) { 1609 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1610 if (!MD || !MD->isVirtual()) { 1611 Diag(Member->getLocStart(), 1612 diag::override_keyword_only_allowed_on_virtual_member_functions) 1613 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1614 } else 1615 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1616 } 1617 1618 if (VS.getLastLocation().isValid()) { 1619 // Update the end location of a method that has a virt-specifiers. 1620 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1621 MD->setRangeEnd(VS.getLastLocation()); 1622 } 1623 1624 CheckOverrideControl(Member); 1625 1626 assert((Name || isInstField) && "No identifier for non-field ?"); 1627 1628 if (isInstField) 1629 FieldCollector->Add(cast<FieldDecl>(Member)); 1630 return Member; 1631} 1632 1633/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1634/// in-class initializer for a non-static C++ class member, and after 1635/// instantiating an in-class initializer in a class template. Such actions 1636/// are deferred until the class is complete. 1637void 1638Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1639 Expr *InitExpr) { 1640 FieldDecl *FD = cast<FieldDecl>(D); 1641 1642 if (!InitExpr) { 1643 FD->setInvalidDecl(); 1644 FD->removeInClassInitializer(); 1645 return; 1646 } 1647 1648 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1649 FD->setInvalidDecl(); 1650 FD->removeInClassInitializer(); 1651 return; 1652 } 1653 1654 ExprResult Init = InitExpr; 1655 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1656 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1657 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1658 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1659 } 1660 Expr **Inits = &InitExpr; 1661 unsigned NumInits = 1; 1662 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1663 InitializationKind Kind = EqualLoc.isInvalid() 1664 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1665 : InitializationKind::CreateCopy(InitExpr->getLocStart(), EqualLoc); 1666 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1667 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1668 if (Init.isInvalid()) { 1669 FD->setInvalidDecl(); 1670 return; 1671 } 1672 1673 CheckImplicitConversions(Init.get(), EqualLoc); 1674 } 1675 1676 // C++0x [class.base.init]p7: 1677 // The initialization of each base and member constitutes a 1678 // full-expression. 1679 Init = MaybeCreateExprWithCleanups(Init); 1680 if (Init.isInvalid()) { 1681 FD->setInvalidDecl(); 1682 return; 1683 } 1684 1685 InitExpr = Init.release(); 1686 1687 FD->setInClassInitializer(InitExpr); 1688} 1689 1690/// \brief Find the direct and/or virtual base specifiers that 1691/// correspond to the given base type, for use in base initialization 1692/// within a constructor. 1693static bool FindBaseInitializer(Sema &SemaRef, 1694 CXXRecordDecl *ClassDecl, 1695 QualType BaseType, 1696 const CXXBaseSpecifier *&DirectBaseSpec, 1697 const CXXBaseSpecifier *&VirtualBaseSpec) { 1698 // First, check for a direct base class. 1699 DirectBaseSpec = 0; 1700 for (CXXRecordDecl::base_class_const_iterator Base 1701 = ClassDecl->bases_begin(); 1702 Base != ClassDecl->bases_end(); ++Base) { 1703 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1704 // We found a direct base of this type. That's what we're 1705 // initializing. 1706 DirectBaseSpec = &*Base; 1707 break; 1708 } 1709 } 1710 1711 // Check for a virtual base class. 1712 // FIXME: We might be able to short-circuit this if we know in advance that 1713 // there are no virtual bases. 1714 VirtualBaseSpec = 0; 1715 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1716 // We haven't found a base yet; search the class hierarchy for a 1717 // virtual base class. 1718 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1719 /*DetectVirtual=*/false); 1720 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1721 BaseType, Paths)) { 1722 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1723 Path != Paths.end(); ++Path) { 1724 if (Path->back().Base->isVirtual()) { 1725 VirtualBaseSpec = Path->back().Base; 1726 break; 1727 } 1728 } 1729 } 1730 } 1731 1732 return DirectBaseSpec || VirtualBaseSpec; 1733} 1734 1735/// \brief Handle a C++ member initializer using braced-init-list syntax. 1736MemInitResult 1737Sema::ActOnMemInitializer(Decl *ConstructorD, 1738 Scope *S, 1739 CXXScopeSpec &SS, 1740 IdentifierInfo *MemberOrBase, 1741 ParsedType TemplateTypeTy, 1742 const DeclSpec &DS, 1743 SourceLocation IdLoc, 1744 Expr *InitList, 1745 SourceLocation EllipsisLoc) { 1746 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1747 DS, IdLoc, InitList, 1748 EllipsisLoc); 1749} 1750 1751/// \brief Handle a C++ member initializer using parentheses syntax. 1752MemInitResult 1753Sema::ActOnMemInitializer(Decl *ConstructorD, 1754 Scope *S, 1755 CXXScopeSpec &SS, 1756 IdentifierInfo *MemberOrBase, 1757 ParsedType TemplateTypeTy, 1758 const DeclSpec &DS, 1759 SourceLocation IdLoc, 1760 SourceLocation LParenLoc, 1761 Expr **Args, unsigned NumArgs, 1762 SourceLocation RParenLoc, 1763 SourceLocation EllipsisLoc) { 1764 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1765 RParenLoc); 1766 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1767 DS, IdLoc, List, EllipsisLoc); 1768} 1769 1770namespace { 1771 1772// Callback to only accept typo corrections that can be a valid C++ member 1773// intializer: either a non-static field member or a base class. 1774class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1775 public: 1776 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1777 : ClassDecl(ClassDecl) {} 1778 1779 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1780 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1781 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1782 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1783 else 1784 return isa<TypeDecl>(ND); 1785 } 1786 return false; 1787 } 1788 1789 private: 1790 CXXRecordDecl *ClassDecl; 1791}; 1792 1793} 1794 1795/// \brief Handle a C++ member initializer. 1796MemInitResult 1797Sema::BuildMemInitializer(Decl *ConstructorD, 1798 Scope *S, 1799 CXXScopeSpec &SS, 1800 IdentifierInfo *MemberOrBase, 1801 ParsedType TemplateTypeTy, 1802 const DeclSpec &DS, 1803 SourceLocation IdLoc, 1804 Expr *Init, 1805 SourceLocation EllipsisLoc) { 1806 if (!ConstructorD) 1807 return true; 1808 1809 AdjustDeclIfTemplate(ConstructorD); 1810 1811 CXXConstructorDecl *Constructor 1812 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1813 if (!Constructor) { 1814 // The user wrote a constructor initializer on a function that is 1815 // not a C++ constructor. Ignore the error for now, because we may 1816 // have more member initializers coming; we'll diagnose it just 1817 // once in ActOnMemInitializers. 1818 return true; 1819 } 1820 1821 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1822 1823 // C++ [class.base.init]p2: 1824 // Names in a mem-initializer-id are looked up in the scope of the 1825 // constructor's class and, if not found in that scope, are looked 1826 // up in the scope containing the constructor's definition. 1827 // [Note: if the constructor's class contains a member with the 1828 // same name as a direct or virtual base class of the class, a 1829 // mem-initializer-id naming the member or base class and composed 1830 // of a single identifier refers to the class member. A 1831 // mem-initializer-id for the hidden base class may be specified 1832 // using a qualified name. ] 1833 if (!SS.getScopeRep() && !TemplateTypeTy) { 1834 // Look for a member, first. 1835 DeclContext::lookup_result Result 1836 = ClassDecl->lookup(MemberOrBase); 1837 if (Result.first != Result.second) { 1838 ValueDecl *Member; 1839 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1840 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1841 if (EllipsisLoc.isValid()) 1842 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1843 << MemberOrBase 1844 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1845 1846 return BuildMemberInitializer(Member, Init, IdLoc); 1847 } 1848 } 1849 } 1850 // It didn't name a member, so see if it names a class. 1851 QualType BaseType; 1852 TypeSourceInfo *TInfo = 0; 1853 1854 if (TemplateTypeTy) { 1855 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1856 } else if (DS.getTypeSpecType() == TST_decltype) { 1857 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1858 } else { 1859 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1860 LookupParsedName(R, S, &SS); 1861 1862 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1863 if (!TyD) { 1864 if (R.isAmbiguous()) return true; 1865 1866 // We don't want access-control diagnostics here. 1867 R.suppressDiagnostics(); 1868 1869 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1870 bool NotUnknownSpecialization = false; 1871 DeclContext *DC = computeDeclContext(SS, false); 1872 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1873 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1874 1875 if (!NotUnknownSpecialization) { 1876 // When the scope specifier can refer to a member of an unknown 1877 // specialization, we take it as a type name. 1878 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1879 SS.getWithLocInContext(Context), 1880 *MemberOrBase, IdLoc); 1881 if (BaseType.isNull()) 1882 return true; 1883 1884 R.clear(); 1885 R.setLookupName(MemberOrBase); 1886 } 1887 } 1888 1889 // If no results were found, try to correct typos. 1890 TypoCorrection Corr; 1891 MemInitializerValidatorCCC Validator(ClassDecl); 1892 if (R.empty() && BaseType.isNull() && 1893 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1894 Validator, ClassDecl))) { 1895 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 1896 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 1897 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1898 // We have found a non-static data member with a similar 1899 // name to what was typed; complain and initialize that 1900 // member. 1901 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1902 << MemberOrBase << true << CorrectedQuotedStr 1903 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1904 Diag(Member->getLocation(), diag::note_previous_decl) 1905 << CorrectedQuotedStr; 1906 1907 return BuildMemberInitializer(Member, Init, IdLoc); 1908 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1909 const CXXBaseSpecifier *DirectBaseSpec; 1910 const CXXBaseSpecifier *VirtualBaseSpec; 1911 if (FindBaseInitializer(*this, ClassDecl, 1912 Context.getTypeDeclType(Type), 1913 DirectBaseSpec, VirtualBaseSpec)) { 1914 // We have found a direct or virtual base class with a 1915 // similar name to what was typed; complain and initialize 1916 // that base class. 1917 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1918 << MemberOrBase << false << CorrectedQuotedStr 1919 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1920 1921 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1922 : VirtualBaseSpec; 1923 Diag(BaseSpec->getLocStart(), 1924 diag::note_base_class_specified_here) 1925 << BaseSpec->getType() 1926 << BaseSpec->getSourceRange(); 1927 1928 TyD = Type; 1929 } 1930 } 1931 } 1932 1933 if (!TyD && BaseType.isNull()) { 1934 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1935 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1936 return true; 1937 } 1938 } 1939 1940 if (BaseType.isNull()) { 1941 BaseType = Context.getTypeDeclType(TyD); 1942 if (SS.isSet()) { 1943 NestedNameSpecifier *Qualifier = 1944 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1945 1946 // FIXME: preserve source range information 1947 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1948 } 1949 } 1950 } 1951 1952 if (!TInfo) 1953 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1954 1955 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 1956} 1957 1958/// Checks a member initializer expression for cases where reference (or 1959/// pointer) members are bound to by-value parameters (or their addresses). 1960static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1961 Expr *Init, 1962 SourceLocation IdLoc) { 1963 QualType MemberTy = Member->getType(); 1964 1965 // We only handle pointers and references currently. 1966 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1967 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1968 return; 1969 1970 const bool IsPointer = MemberTy->isPointerType(); 1971 if (IsPointer) { 1972 if (const UnaryOperator *Op 1973 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1974 // The only case we're worried about with pointers requires taking the 1975 // address. 1976 if (Op->getOpcode() != UO_AddrOf) 1977 return; 1978 1979 Init = Op->getSubExpr(); 1980 } else { 1981 // We only handle address-of expression initializers for pointers. 1982 return; 1983 } 1984 } 1985 1986 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1987 // Taking the address of a temporary will be diagnosed as a hard error. 1988 if (IsPointer) 1989 return; 1990 1991 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1992 << Member << Init->getSourceRange(); 1993 } else if (const DeclRefExpr *DRE 1994 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1995 // We only warn when referring to a non-reference parameter declaration. 1996 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1997 if (!Parameter || Parameter->getType()->isReferenceType()) 1998 return; 1999 2000 S.Diag(Init->getExprLoc(), 2001 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2002 : diag::warn_bind_ref_member_to_parameter) 2003 << Member << Parameter << Init->getSourceRange(); 2004 } else { 2005 // Other initializers are fine. 2006 return; 2007 } 2008 2009 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2010 << (unsigned)IsPointer; 2011} 2012 2013/// Checks an initializer expression for use of uninitialized fields, such as 2014/// containing the field that is being initialized. Returns true if there is an 2015/// uninitialized field was used an updates the SourceLocation parameter; false 2016/// otherwise. 2017static bool InitExprContainsUninitializedFields(const Stmt *S, 2018 const ValueDecl *LhsField, 2019 SourceLocation *L) { 2020 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 2021 2022 if (isa<CallExpr>(S)) { 2023 // Do not descend into function calls or constructors, as the use 2024 // of an uninitialized field may be valid. One would have to inspect 2025 // the contents of the function/ctor to determine if it is safe or not. 2026 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 2027 // may be safe, depending on what the function/ctor does. 2028 return false; 2029 } 2030 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 2031 const NamedDecl *RhsField = ME->getMemberDecl(); 2032 2033 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 2034 // The member expression points to a static data member. 2035 assert(VD->isStaticDataMember() && 2036 "Member points to non-static data member!"); 2037 (void)VD; 2038 return false; 2039 } 2040 2041 if (isa<EnumConstantDecl>(RhsField)) { 2042 // The member expression points to an enum. 2043 return false; 2044 } 2045 2046 if (RhsField == LhsField) { 2047 // Initializing a field with itself. Throw a warning. 2048 // But wait; there are exceptions! 2049 // Exception #1: The field may not belong to this record. 2050 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2051 const Expr *base = ME->getBase(); 2052 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2053 // Even though the field matches, it does not belong to this record. 2054 return false; 2055 } 2056 // None of the exceptions triggered; return true to indicate an 2057 // uninitialized field was used. 2058 *L = ME->getMemberLoc(); 2059 return true; 2060 } 2061 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2062 // sizeof/alignof doesn't reference contents, do not warn. 2063 return false; 2064 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2065 // address-of doesn't reference contents (the pointer may be dereferenced 2066 // in the same expression but it would be rare; and weird). 2067 if (UOE->getOpcode() == UO_AddrOf) 2068 return false; 2069 } 2070 for (Stmt::const_child_range it = S->children(); it; ++it) { 2071 if (!*it) { 2072 // An expression such as 'member(arg ?: "")' may trigger this. 2073 continue; 2074 } 2075 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2076 return true; 2077 } 2078 return false; 2079} 2080 2081MemInitResult 2082Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2083 SourceLocation IdLoc) { 2084 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2085 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2086 assert((DirectMember || IndirectMember) && 2087 "Member must be a FieldDecl or IndirectFieldDecl"); 2088 2089 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2090 return true; 2091 2092 if (Member->isInvalidDecl()) 2093 return true; 2094 2095 // Diagnose value-uses of fields to initialize themselves, e.g. 2096 // foo(foo) 2097 // where foo is not also a parameter to the constructor. 2098 // TODO: implement -Wuninitialized and fold this into that framework. 2099 Expr **Args; 2100 unsigned NumArgs; 2101 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2102 Args = ParenList->getExprs(); 2103 NumArgs = ParenList->getNumExprs(); 2104 } else { 2105 InitListExpr *InitList = cast<InitListExpr>(Init); 2106 Args = InitList->getInits(); 2107 NumArgs = InitList->getNumInits(); 2108 } 2109 for (unsigned i = 0; i < NumArgs; ++i) { 2110 SourceLocation L; 2111 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 2112 // FIXME: Return true in the case when other fields are used before being 2113 // uninitialized. For example, let this field be the i'th field. When 2114 // initializing the i'th field, throw a warning if any of the >= i'th 2115 // fields are used, as they are not yet initialized. 2116 // Right now we are only handling the case where the i'th field uses 2117 // itself in its initializer. 2118 Diag(L, diag::warn_field_is_uninit); 2119 } 2120 } 2121 2122 SourceRange InitRange = Init->getSourceRange(); 2123 2124 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2125 // Can't check initialization for a member of dependent type or when 2126 // any of the arguments are type-dependent expressions. 2127 DiscardCleanupsInEvaluationContext(); 2128 } else { 2129 bool InitList = false; 2130 if (isa<InitListExpr>(Init)) { 2131 InitList = true; 2132 Args = &Init; 2133 NumArgs = 1; 2134 2135 if (isStdInitializerList(Member->getType(), 0)) { 2136 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2137 << /*at end of ctor*/1 << InitRange; 2138 } 2139 } 2140 2141 // Initialize the member. 2142 InitializedEntity MemberEntity = 2143 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2144 : InitializedEntity::InitializeMember(IndirectMember, 0); 2145 InitializationKind Kind = 2146 InitList ? InitializationKind::CreateDirectList(IdLoc) 2147 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2148 InitRange.getEnd()); 2149 2150 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2151 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2152 MultiExprArg(*this, Args, NumArgs), 2153 0); 2154 if (MemberInit.isInvalid()) 2155 return true; 2156 2157 CheckImplicitConversions(MemberInit.get(), 2158 InitRange.getBegin()); 2159 2160 // C++0x [class.base.init]p7: 2161 // The initialization of each base and member constitutes a 2162 // full-expression. 2163 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2164 if (MemberInit.isInvalid()) 2165 return true; 2166 2167 // If we are in a dependent context, template instantiation will 2168 // perform this type-checking again. Just save the arguments that we 2169 // received. 2170 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2171 // of the information that we have about the member 2172 // initializer. However, deconstructing the ASTs is a dicey process, 2173 // and this approach is far more likely to get the corner cases right. 2174 if (CurContext->isDependentContext()) { 2175 // The existing Init will do fine. 2176 } else { 2177 Init = MemberInit.get(); 2178 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2179 } 2180 } 2181 2182 if (DirectMember) { 2183 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2184 InitRange.getBegin(), Init, 2185 InitRange.getEnd()); 2186 } else { 2187 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2188 InitRange.getBegin(), Init, 2189 InitRange.getEnd()); 2190 } 2191} 2192 2193MemInitResult 2194Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2195 CXXRecordDecl *ClassDecl) { 2196 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2197 if (!LangOpts.CPlusPlus0x) 2198 return Diag(NameLoc, diag::err_delegating_ctor) 2199 << TInfo->getTypeLoc().getLocalSourceRange(); 2200 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2201 2202 bool InitList = true; 2203 Expr **Args = &Init; 2204 unsigned NumArgs = 1; 2205 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2206 InitList = false; 2207 Args = ParenList->getExprs(); 2208 NumArgs = ParenList->getNumExprs(); 2209 } 2210 2211 SourceRange InitRange = Init->getSourceRange(); 2212 // Initialize the object. 2213 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2214 QualType(ClassDecl->getTypeForDecl(), 0)); 2215 InitializationKind Kind = 2216 InitList ? InitializationKind::CreateDirectList(NameLoc) 2217 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2218 InitRange.getEnd()); 2219 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2220 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2221 MultiExprArg(*this, Args,NumArgs), 2222 0); 2223 if (DelegationInit.isInvalid()) 2224 return true; 2225 2226 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2227 "Delegating constructor with no target?"); 2228 2229 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2230 2231 // C++0x [class.base.init]p7: 2232 // The initialization of each base and member constitutes a 2233 // full-expression. 2234 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2235 if (DelegationInit.isInvalid()) 2236 return true; 2237 2238 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2239 DelegationInit.takeAs<Expr>(), 2240 InitRange.getEnd()); 2241} 2242 2243MemInitResult 2244Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2245 Expr *Init, CXXRecordDecl *ClassDecl, 2246 SourceLocation EllipsisLoc) { 2247 SourceLocation BaseLoc 2248 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2249 2250 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2251 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2252 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2253 2254 // C++ [class.base.init]p2: 2255 // [...] Unless the mem-initializer-id names a nonstatic data 2256 // member of the constructor's class or a direct or virtual base 2257 // of that class, the mem-initializer is ill-formed. A 2258 // mem-initializer-list can initialize a base class using any 2259 // name that denotes that base class type. 2260 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2261 2262 SourceRange InitRange = Init->getSourceRange(); 2263 if (EllipsisLoc.isValid()) { 2264 // This is a pack expansion. 2265 if (!BaseType->containsUnexpandedParameterPack()) { 2266 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2267 << SourceRange(BaseLoc, InitRange.getEnd()); 2268 2269 EllipsisLoc = SourceLocation(); 2270 } 2271 } else { 2272 // Check for any unexpanded parameter packs. 2273 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2274 return true; 2275 2276 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2277 return true; 2278 } 2279 2280 // Check for direct and virtual base classes. 2281 const CXXBaseSpecifier *DirectBaseSpec = 0; 2282 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2283 if (!Dependent) { 2284 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2285 BaseType)) 2286 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2287 2288 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2289 VirtualBaseSpec); 2290 2291 // C++ [base.class.init]p2: 2292 // Unless the mem-initializer-id names a nonstatic data member of the 2293 // constructor's class or a direct or virtual base of that class, the 2294 // mem-initializer is ill-formed. 2295 if (!DirectBaseSpec && !VirtualBaseSpec) { 2296 // If the class has any dependent bases, then it's possible that 2297 // one of those types will resolve to the same type as 2298 // BaseType. Therefore, just treat this as a dependent base 2299 // class initialization. FIXME: Should we try to check the 2300 // initialization anyway? It seems odd. 2301 if (ClassDecl->hasAnyDependentBases()) 2302 Dependent = true; 2303 else 2304 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2305 << BaseType << Context.getTypeDeclType(ClassDecl) 2306 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2307 } 2308 } 2309 2310 if (Dependent) { 2311 DiscardCleanupsInEvaluationContext(); 2312 2313 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2314 /*IsVirtual=*/false, 2315 InitRange.getBegin(), Init, 2316 InitRange.getEnd(), EllipsisLoc); 2317 } 2318 2319 // C++ [base.class.init]p2: 2320 // If a mem-initializer-id is ambiguous because it designates both 2321 // a direct non-virtual base class and an inherited virtual base 2322 // class, the mem-initializer is ill-formed. 2323 if (DirectBaseSpec && VirtualBaseSpec) 2324 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2325 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2326 2327 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2328 if (!BaseSpec) 2329 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2330 2331 // Initialize the base. 2332 bool InitList = true; 2333 Expr **Args = &Init; 2334 unsigned NumArgs = 1; 2335 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2336 InitList = false; 2337 Args = ParenList->getExprs(); 2338 NumArgs = ParenList->getNumExprs(); 2339 } 2340 2341 InitializedEntity BaseEntity = 2342 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2343 InitializationKind Kind = 2344 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2345 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2346 InitRange.getEnd()); 2347 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2348 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2349 MultiExprArg(*this, Args, NumArgs), 2350 0); 2351 if (BaseInit.isInvalid()) 2352 return true; 2353 2354 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2355 2356 // C++0x [class.base.init]p7: 2357 // The initialization of each base and member constitutes a 2358 // full-expression. 2359 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2360 if (BaseInit.isInvalid()) 2361 return true; 2362 2363 // If we are in a dependent context, template instantiation will 2364 // perform this type-checking again. Just save the arguments that we 2365 // received in a ParenListExpr. 2366 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2367 // of the information that we have about the base 2368 // initializer. However, deconstructing the ASTs is a dicey process, 2369 // and this approach is far more likely to get the corner cases right. 2370 if (CurContext->isDependentContext()) 2371 BaseInit = Owned(Init); 2372 2373 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2374 BaseSpec->isVirtual(), 2375 InitRange.getBegin(), 2376 BaseInit.takeAs<Expr>(), 2377 InitRange.getEnd(), EllipsisLoc); 2378} 2379 2380// Create a static_cast\<T&&>(expr). 2381static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2382 QualType ExprType = E->getType(); 2383 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2384 SourceLocation ExprLoc = E->getLocStart(); 2385 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2386 TargetType, ExprLoc); 2387 2388 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2389 SourceRange(ExprLoc, ExprLoc), 2390 E->getSourceRange()).take(); 2391} 2392 2393/// ImplicitInitializerKind - How an implicit base or member initializer should 2394/// initialize its base or member. 2395enum ImplicitInitializerKind { 2396 IIK_Default, 2397 IIK_Copy, 2398 IIK_Move 2399}; 2400 2401static bool 2402BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2403 ImplicitInitializerKind ImplicitInitKind, 2404 CXXBaseSpecifier *BaseSpec, 2405 bool IsInheritedVirtualBase, 2406 CXXCtorInitializer *&CXXBaseInit) { 2407 InitializedEntity InitEntity 2408 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2409 IsInheritedVirtualBase); 2410 2411 ExprResult BaseInit; 2412 2413 switch (ImplicitInitKind) { 2414 case IIK_Default: { 2415 InitializationKind InitKind 2416 = InitializationKind::CreateDefault(Constructor->getLocation()); 2417 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2418 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2419 MultiExprArg(SemaRef, 0, 0)); 2420 break; 2421 } 2422 2423 case IIK_Move: 2424 case IIK_Copy: { 2425 bool Moving = ImplicitInitKind == IIK_Move; 2426 ParmVarDecl *Param = Constructor->getParamDecl(0); 2427 QualType ParamType = Param->getType().getNonReferenceType(); 2428 2429 Expr *CopyCtorArg = 2430 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2431 SourceLocation(), Param, false, 2432 Constructor->getLocation(), ParamType, 2433 VK_LValue, 0); 2434 2435 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2436 2437 // Cast to the base class to avoid ambiguities. 2438 QualType ArgTy = 2439 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2440 ParamType.getQualifiers()); 2441 2442 if (Moving) { 2443 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2444 } 2445 2446 CXXCastPath BasePath; 2447 BasePath.push_back(BaseSpec); 2448 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2449 CK_UncheckedDerivedToBase, 2450 Moving ? VK_XValue : VK_LValue, 2451 &BasePath).take(); 2452 2453 InitializationKind InitKind 2454 = InitializationKind::CreateDirect(Constructor->getLocation(), 2455 SourceLocation(), SourceLocation()); 2456 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2457 &CopyCtorArg, 1); 2458 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2459 MultiExprArg(&CopyCtorArg, 1)); 2460 break; 2461 } 2462 } 2463 2464 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2465 if (BaseInit.isInvalid()) 2466 return true; 2467 2468 CXXBaseInit = 2469 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2470 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2471 SourceLocation()), 2472 BaseSpec->isVirtual(), 2473 SourceLocation(), 2474 BaseInit.takeAs<Expr>(), 2475 SourceLocation(), 2476 SourceLocation()); 2477 2478 return false; 2479} 2480 2481static bool RefersToRValueRef(Expr *MemRef) { 2482 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2483 return Referenced->getType()->isRValueReferenceType(); 2484} 2485 2486static bool 2487BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2488 ImplicitInitializerKind ImplicitInitKind, 2489 FieldDecl *Field, IndirectFieldDecl *Indirect, 2490 CXXCtorInitializer *&CXXMemberInit) { 2491 if (Field->isInvalidDecl()) 2492 return true; 2493 2494 SourceLocation Loc = Constructor->getLocation(); 2495 2496 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2497 bool Moving = ImplicitInitKind == IIK_Move; 2498 ParmVarDecl *Param = Constructor->getParamDecl(0); 2499 QualType ParamType = Param->getType().getNonReferenceType(); 2500 2501 // Suppress copying zero-width bitfields. 2502 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2503 return false; 2504 2505 Expr *MemberExprBase = 2506 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2507 SourceLocation(), Param, false, 2508 Loc, ParamType, VK_LValue, 0); 2509 2510 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2511 2512 if (Moving) { 2513 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2514 } 2515 2516 // Build a reference to this field within the parameter. 2517 CXXScopeSpec SS; 2518 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2519 Sema::LookupMemberName); 2520 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2521 : cast<ValueDecl>(Field), AS_public); 2522 MemberLookup.resolveKind(); 2523 ExprResult CtorArg 2524 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2525 ParamType, Loc, 2526 /*IsArrow=*/false, 2527 SS, 2528 /*TemplateKWLoc=*/SourceLocation(), 2529 /*FirstQualifierInScope=*/0, 2530 MemberLookup, 2531 /*TemplateArgs=*/0); 2532 if (CtorArg.isInvalid()) 2533 return true; 2534 2535 // C++11 [class.copy]p15: 2536 // - if a member m has rvalue reference type T&&, it is direct-initialized 2537 // with static_cast<T&&>(x.m); 2538 if (RefersToRValueRef(CtorArg.get())) { 2539 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2540 } 2541 2542 // When the field we are copying is an array, create index variables for 2543 // each dimension of the array. We use these index variables to subscript 2544 // the source array, and other clients (e.g., CodeGen) will perform the 2545 // necessary iteration with these index variables. 2546 SmallVector<VarDecl *, 4> IndexVariables; 2547 QualType BaseType = Field->getType(); 2548 QualType SizeType = SemaRef.Context.getSizeType(); 2549 bool InitializingArray = false; 2550 while (const ConstantArrayType *Array 2551 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2552 InitializingArray = true; 2553 // Create the iteration variable for this array index. 2554 IdentifierInfo *IterationVarName = 0; 2555 { 2556 SmallString<8> Str; 2557 llvm::raw_svector_ostream OS(Str); 2558 OS << "__i" << IndexVariables.size(); 2559 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2560 } 2561 VarDecl *IterationVar 2562 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2563 IterationVarName, SizeType, 2564 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2565 SC_None, SC_None); 2566 IndexVariables.push_back(IterationVar); 2567 2568 // Create a reference to the iteration variable. 2569 ExprResult IterationVarRef 2570 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2571 assert(!IterationVarRef.isInvalid() && 2572 "Reference to invented variable cannot fail!"); 2573 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2574 assert(!IterationVarRef.isInvalid() && 2575 "Conversion of invented variable cannot fail!"); 2576 2577 // Subscript the array with this iteration variable. 2578 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2579 IterationVarRef.take(), 2580 Loc); 2581 if (CtorArg.isInvalid()) 2582 return true; 2583 2584 BaseType = Array->getElementType(); 2585 } 2586 2587 // The array subscript expression is an lvalue, which is wrong for moving. 2588 if (Moving && InitializingArray) 2589 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2590 2591 // Construct the entity that we will be initializing. For an array, this 2592 // will be first element in the array, which may require several levels 2593 // of array-subscript entities. 2594 SmallVector<InitializedEntity, 4> Entities; 2595 Entities.reserve(1 + IndexVariables.size()); 2596 if (Indirect) 2597 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2598 else 2599 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2600 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2601 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2602 0, 2603 Entities.back())); 2604 2605 // Direct-initialize to use the copy constructor. 2606 InitializationKind InitKind = 2607 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2608 2609 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2610 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2611 &CtorArgE, 1); 2612 2613 ExprResult MemberInit 2614 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2615 MultiExprArg(&CtorArgE, 1)); 2616 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2617 if (MemberInit.isInvalid()) 2618 return true; 2619 2620 if (Indirect) { 2621 assert(IndexVariables.size() == 0 && 2622 "Indirect field improperly initialized"); 2623 CXXMemberInit 2624 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2625 Loc, Loc, 2626 MemberInit.takeAs<Expr>(), 2627 Loc); 2628 } else 2629 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2630 Loc, MemberInit.takeAs<Expr>(), 2631 Loc, 2632 IndexVariables.data(), 2633 IndexVariables.size()); 2634 return false; 2635 } 2636 2637 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2638 2639 QualType FieldBaseElementType = 2640 SemaRef.Context.getBaseElementType(Field->getType()); 2641 2642 if (FieldBaseElementType->isRecordType()) { 2643 InitializedEntity InitEntity 2644 = Indirect? InitializedEntity::InitializeMember(Indirect) 2645 : InitializedEntity::InitializeMember(Field); 2646 InitializationKind InitKind = 2647 InitializationKind::CreateDefault(Loc); 2648 2649 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2650 ExprResult MemberInit = 2651 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2652 2653 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2654 if (MemberInit.isInvalid()) 2655 return true; 2656 2657 if (Indirect) 2658 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2659 Indirect, Loc, 2660 Loc, 2661 MemberInit.get(), 2662 Loc); 2663 else 2664 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2665 Field, Loc, Loc, 2666 MemberInit.get(), 2667 Loc); 2668 return false; 2669 } 2670 2671 if (!Field->getParent()->isUnion()) { 2672 if (FieldBaseElementType->isReferenceType()) { 2673 SemaRef.Diag(Constructor->getLocation(), 2674 diag::err_uninitialized_member_in_ctor) 2675 << (int)Constructor->isImplicit() 2676 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2677 << 0 << Field->getDeclName(); 2678 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2679 return true; 2680 } 2681 2682 if (FieldBaseElementType.isConstQualified()) { 2683 SemaRef.Diag(Constructor->getLocation(), 2684 diag::err_uninitialized_member_in_ctor) 2685 << (int)Constructor->isImplicit() 2686 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2687 << 1 << Field->getDeclName(); 2688 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2689 return true; 2690 } 2691 } 2692 2693 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2694 FieldBaseElementType->isObjCRetainableType() && 2695 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2696 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2697 // Instant objects: 2698 // Default-initialize Objective-C pointers to NULL. 2699 CXXMemberInit 2700 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2701 Loc, Loc, 2702 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2703 Loc); 2704 return false; 2705 } 2706 2707 // Nothing to initialize. 2708 CXXMemberInit = 0; 2709 return false; 2710} 2711 2712namespace { 2713struct BaseAndFieldInfo { 2714 Sema &S; 2715 CXXConstructorDecl *Ctor; 2716 bool AnyErrorsInInits; 2717 ImplicitInitializerKind IIK; 2718 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2719 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2720 2721 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2722 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2723 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2724 if (Generated && Ctor->isCopyConstructor()) 2725 IIK = IIK_Copy; 2726 else if (Generated && Ctor->isMoveConstructor()) 2727 IIK = IIK_Move; 2728 else 2729 IIK = IIK_Default; 2730 } 2731 2732 bool isImplicitCopyOrMove() const { 2733 switch (IIK) { 2734 case IIK_Copy: 2735 case IIK_Move: 2736 return true; 2737 2738 case IIK_Default: 2739 return false; 2740 } 2741 2742 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2743 } 2744}; 2745} 2746 2747/// \brief Determine whether the given indirect field declaration is somewhere 2748/// within an anonymous union. 2749static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2750 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2751 CEnd = F->chain_end(); 2752 C != CEnd; ++C) 2753 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2754 if (Record->isUnion()) 2755 return true; 2756 2757 return false; 2758} 2759 2760/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2761/// array type. 2762static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2763 if (T->isIncompleteArrayType()) 2764 return true; 2765 2766 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2767 if (!ArrayT->getSize()) 2768 return true; 2769 2770 T = ArrayT->getElementType(); 2771 } 2772 2773 return false; 2774} 2775 2776static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2777 FieldDecl *Field, 2778 IndirectFieldDecl *Indirect = 0) { 2779 2780 // Overwhelmingly common case: we have a direct initializer for this field. 2781 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2782 Info.AllToInit.push_back(Init); 2783 return false; 2784 } 2785 2786 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2787 // has a brace-or-equal-initializer, the entity is initialized as specified 2788 // in [dcl.init]. 2789 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2790 CXXCtorInitializer *Init; 2791 if (Indirect) 2792 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2793 SourceLocation(), 2794 SourceLocation(), 0, 2795 SourceLocation()); 2796 else 2797 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2798 SourceLocation(), 2799 SourceLocation(), 0, 2800 SourceLocation()); 2801 Info.AllToInit.push_back(Init); 2802 return false; 2803 } 2804 2805 // Don't build an implicit initializer for union members if none was 2806 // explicitly specified. 2807 if (Field->getParent()->isUnion() || 2808 (Indirect && isWithinAnonymousUnion(Indirect))) 2809 return false; 2810 2811 // Don't initialize incomplete or zero-length arrays. 2812 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2813 return false; 2814 2815 // Don't try to build an implicit initializer if there were semantic 2816 // errors in any of the initializers (and therefore we might be 2817 // missing some that the user actually wrote). 2818 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2819 return false; 2820 2821 CXXCtorInitializer *Init = 0; 2822 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2823 Indirect, Init)) 2824 return true; 2825 2826 if (Init) 2827 Info.AllToInit.push_back(Init); 2828 2829 return false; 2830} 2831 2832bool 2833Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2834 CXXCtorInitializer *Initializer) { 2835 assert(Initializer->isDelegatingInitializer()); 2836 Constructor->setNumCtorInitializers(1); 2837 CXXCtorInitializer **initializer = 2838 new (Context) CXXCtorInitializer*[1]; 2839 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2840 Constructor->setCtorInitializers(initializer); 2841 2842 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2843 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2844 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2845 } 2846 2847 DelegatingCtorDecls.push_back(Constructor); 2848 2849 return false; 2850} 2851 2852bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2853 CXXCtorInitializer **Initializers, 2854 unsigned NumInitializers, 2855 bool AnyErrors) { 2856 if (Constructor->isDependentContext()) { 2857 // Just store the initializers as written, they will be checked during 2858 // instantiation. 2859 if (NumInitializers > 0) { 2860 Constructor->setNumCtorInitializers(NumInitializers); 2861 CXXCtorInitializer **baseOrMemberInitializers = 2862 new (Context) CXXCtorInitializer*[NumInitializers]; 2863 memcpy(baseOrMemberInitializers, Initializers, 2864 NumInitializers * sizeof(CXXCtorInitializer*)); 2865 Constructor->setCtorInitializers(baseOrMemberInitializers); 2866 } 2867 2868 return false; 2869 } 2870 2871 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2872 2873 // We need to build the initializer AST according to order of construction 2874 // and not what user specified in the Initializers list. 2875 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2876 if (!ClassDecl) 2877 return true; 2878 2879 bool HadError = false; 2880 2881 for (unsigned i = 0; i < NumInitializers; i++) { 2882 CXXCtorInitializer *Member = Initializers[i]; 2883 2884 if (Member->isBaseInitializer()) 2885 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2886 else 2887 Info.AllBaseFields[Member->getAnyMember()] = Member; 2888 } 2889 2890 // Keep track of the direct virtual bases. 2891 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2892 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2893 E = ClassDecl->bases_end(); I != E; ++I) { 2894 if (I->isVirtual()) 2895 DirectVBases.insert(I); 2896 } 2897 2898 // Push virtual bases before others. 2899 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2900 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2901 2902 if (CXXCtorInitializer *Value 2903 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2904 Info.AllToInit.push_back(Value); 2905 } else if (!AnyErrors) { 2906 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2907 CXXCtorInitializer *CXXBaseInit; 2908 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2909 VBase, IsInheritedVirtualBase, 2910 CXXBaseInit)) { 2911 HadError = true; 2912 continue; 2913 } 2914 2915 Info.AllToInit.push_back(CXXBaseInit); 2916 } 2917 } 2918 2919 // Non-virtual bases. 2920 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2921 E = ClassDecl->bases_end(); Base != E; ++Base) { 2922 // Virtuals are in the virtual base list and already constructed. 2923 if (Base->isVirtual()) 2924 continue; 2925 2926 if (CXXCtorInitializer *Value 2927 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2928 Info.AllToInit.push_back(Value); 2929 } else if (!AnyErrors) { 2930 CXXCtorInitializer *CXXBaseInit; 2931 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2932 Base, /*IsInheritedVirtualBase=*/false, 2933 CXXBaseInit)) { 2934 HadError = true; 2935 continue; 2936 } 2937 2938 Info.AllToInit.push_back(CXXBaseInit); 2939 } 2940 } 2941 2942 // Fields. 2943 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2944 MemEnd = ClassDecl->decls_end(); 2945 Mem != MemEnd; ++Mem) { 2946 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2947 // C++ [class.bit]p2: 2948 // A declaration for a bit-field that omits the identifier declares an 2949 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2950 // initialized. 2951 if (F->isUnnamedBitfield()) 2952 continue; 2953 2954 // If we're not generating the implicit copy/move constructor, then we'll 2955 // handle anonymous struct/union fields based on their individual 2956 // indirect fields. 2957 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2958 continue; 2959 2960 if (CollectFieldInitializer(*this, Info, F)) 2961 HadError = true; 2962 continue; 2963 } 2964 2965 // Beyond this point, we only consider default initialization. 2966 if (Info.IIK != IIK_Default) 2967 continue; 2968 2969 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2970 if (F->getType()->isIncompleteArrayType()) { 2971 assert(ClassDecl->hasFlexibleArrayMember() && 2972 "Incomplete array type is not valid"); 2973 continue; 2974 } 2975 2976 // Initialize each field of an anonymous struct individually. 2977 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2978 HadError = true; 2979 2980 continue; 2981 } 2982 } 2983 2984 NumInitializers = Info.AllToInit.size(); 2985 if (NumInitializers > 0) { 2986 Constructor->setNumCtorInitializers(NumInitializers); 2987 CXXCtorInitializer **baseOrMemberInitializers = 2988 new (Context) CXXCtorInitializer*[NumInitializers]; 2989 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2990 NumInitializers * sizeof(CXXCtorInitializer*)); 2991 Constructor->setCtorInitializers(baseOrMemberInitializers); 2992 2993 // Constructors implicitly reference the base and member 2994 // destructors. 2995 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2996 Constructor->getParent()); 2997 } 2998 2999 return HadError; 3000} 3001 3002static void *GetKeyForTopLevelField(FieldDecl *Field) { 3003 // For anonymous unions, use the class declaration as the key. 3004 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3005 if (RT->getDecl()->isAnonymousStructOrUnion()) 3006 return static_cast<void *>(RT->getDecl()); 3007 } 3008 return static_cast<void *>(Field); 3009} 3010 3011static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3012 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3013} 3014 3015static void *GetKeyForMember(ASTContext &Context, 3016 CXXCtorInitializer *Member) { 3017 if (!Member->isAnyMemberInitializer()) 3018 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3019 3020 // For fields injected into the class via declaration of an anonymous union, 3021 // use its anonymous union class declaration as the unique key. 3022 FieldDecl *Field = Member->getAnyMember(); 3023 3024 // If the field is a member of an anonymous struct or union, our key 3025 // is the anonymous record decl that's a direct child of the class. 3026 RecordDecl *RD = Field->getParent(); 3027 if (RD->isAnonymousStructOrUnion()) { 3028 while (true) { 3029 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3030 if (Parent->isAnonymousStructOrUnion()) 3031 RD = Parent; 3032 else 3033 break; 3034 } 3035 3036 return static_cast<void *>(RD); 3037 } 3038 3039 return static_cast<void *>(Field); 3040} 3041 3042static void 3043DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3044 const CXXConstructorDecl *Constructor, 3045 CXXCtorInitializer **Inits, 3046 unsigned NumInits) { 3047 if (Constructor->getDeclContext()->isDependentContext()) 3048 return; 3049 3050 // Don't check initializers order unless the warning is enabled at the 3051 // location of at least one initializer. 3052 bool ShouldCheckOrder = false; 3053 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3054 CXXCtorInitializer *Init = Inits[InitIndex]; 3055 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3056 Init->getSourceLocation()) 3057 != DiagnosticsEngine::Ignored) { 3058 ShouldCheckOrder = true; 3059 break; 3060 } 3061 } 3062 if (!ShouldCheckOrder) 3063 return; 3064 3065 // Build the list of bases and members in the order that they'll 3066 // actually be initialized. The explicit initializers should be in 3067 // this same order but may be missing things. 3068 SmallVector<const void*, 32> IdealInitKeys; 3069 3070 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3071 3072 // 1. Virtual bases. 3073 for (CXXRecordDecl::base_class_const_iterator VBase = 3074 ClassDecl->vbases_begin(), 3075 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3076 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3077 3078 // 2. Non-virtual bases. 3079 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3080 E = ClassDecl->bases_end(); Base != E; ++Base) { 3081 if (Base->isVirtual()) 3082 continue; 3083 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3084 } 3085 3086 // 3. Direct fields. 3087 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3088 E = ClassDecl->field_end(); Field != E; ++Field) { 3089 if (Field->isUnnamedBitfield()) 3090 continue; 3091 3092 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3093 } 3094 3095 unsigned NumIdealInits = IdealInitKeys.size(); 3096 unsigned IdealIndex = 0; 3097 3098 CXXCtorInitializer *PrevInit = 0; 3099 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3100 CXXCtorInitializer *Init = Inits[InitIndex]; 3101 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3102 3103 // Scan forward to try to find this initializer in the idealized 3104 // initializers list. 3105 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3106 if (InitKey == IdealInitKeys[IdealIndex]) 3107 break; 3108 3109 // If we didn't find this initializer, it must be because we 3110 // scanned past it on a previous iteration. That can only 3111 // happen if we're out of order; emit a warning. 3112 if (IdealIndex == NumIdealInits && PrevInit) { 3113 Sema::SemaDiagnosticBuilder D = 3114 SemaRef.Diag(PrevInit->getSourceLocation(), 3115 diag::warn_initializer_out_of_order); 3116 3117 if (PrevInit->isAnyMemberInitializer()) 3118 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3119 else 3120 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3121 3122 if (Init->isAnyMemberInitializer()) 3123 D << 0 << Init->getAnyMember()->getDeclName(); 3124 else 3125 D << 1 << Init->getTypeSourceInfo()->getType(); 3126 3127 // Move back to the initializer's location in the ideal list. 3128 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3129 if (InitKey == IdealInitKeys[IdealIndex]) 3130 break; 3131 3132 assert(IdealIndex != NumIdealInits && 3133 "initializer not found in initializer list"); 3134 } 3135 3136 PrevInit = Init; 3137 } 3138} 3139 3140namespace { 3141bool CheckRedundantInit(Sema &S, 3142 CXXCtorInitializer *Init, 3143 CXXCtorInitializer *&PrevInit) { 3144 if (!PrevInit) { 3145 PrevInit = Init; 3146 return false; 3147 } 3148 3149 if (FieldDecl *Field = Init->getMember()) 3150 S.Diag(Init->getSourceLocation(), 3151 diag::err_multiple_mem_initialization) 3152 << Field->getDeclName() 3153 << Init->getSourceRange(); 3154 else { 3155 const Type *BaseClass = Init->getBaseClass(); 3156 assert(BaseClass && "neither field nor base"); 3157 S.Diag(Init->getSourceLocation(), 3158 diag::err_multiple_base_initialization) 3159 << QualType(BaseClass, 0) 3160 << Init->getSourceRange(); 3161 } 3162 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3163 << 0 << PrevInit->getSourceRange(); 3164 3165 return true; 3166} 3167 3168typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3169typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3170 3171bool CheckRedundantUnionInit(Sema &S, 3172 CXXCtorInitializer *Init, 3173 RedundantUnionMap &Unions) { 3174 FieldDecl *Field = Init->getAnyMember(); 3175 RecordDecl *Parent = Field->getParent(); 3176 NamedDecl *Child = Field; 3177 3178 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3179 if (Parent->isUnion()) { 3180 UnionEntry &En = Unions[Parent]; 3181 if (En.first && En.first != Child) { 3182 S.Diag(Init->getSourceLocation(), 3183 diag::err_multiple_mem_union_initialization) 3184 << Field->getDeclName() 3185 << Init->getSourceRange(); 3186 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3187 << 0 << En.second->getSourceRange(); 3188 return true; 3189 } 3190 if (!En.first) { 3191 En.first = Child; 3192 En.second = Init; 3193 } 3194 if (!Parent->isAnonymousStructOrUnion()) 3195 return false; 3196 } 3197 3198 Child = Parent; 3199 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3200 } 3201 3202 return false; 3203} 3204} 3205 3206/// ActOnMemInitializers - Handle the member initializers for a constructor. 3207void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3208 SourceLocation ColonLoc, 3209 CXXCtorInitializer **meminits, 3210 unsigned NumMemInits, 3211 bool AnyErrors) { 3212 if (!ConstructorDecl) 3213 return; 3214 3215 AdjustDeclIfTemplate(ConstructorDecl); 3216 3217 CXXConstructorDecl *Constructor 3218 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3219 3220 if (!Constructor) { 3221 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3222 return; 3223 } 3224 3225 CXXCtorInitializer **MemInits = 3226 reinterpret_cast<CXXCtorInitializer **>(meminits); 3227 3228 // Mapping for the duplicate initializers check. 3229 // For member initializers, this is keyed with a FieldDecl*. 3230 // For base initializers, this is keyed with a Type*. 3231 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3232 3233 // Mapping for the inconsistent anonymous-union initializers check. 3234 RedundantUnionMap MemberUnions; 3235 3236 bool HadError = false; 3237 for (unsigned i = 0; i < NumMemInits; i++) { 3238 CXXCtorInitializer *Init = MemInits[i]; 3239 3240 // Set the source order index. 3241 Init->setSourceOrder(i); 3242 3243 if (Init->isAnyMemberInitializer()) { 3244 FieldDecl *Field = Init->getAnyMember(); 3245 if (CheckRedundantInit(*this, Init, Members[Field]) || 3246 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3247 HadError = true; 3248 } else if (Init->isBaseInitializer()) { 3249 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3250 if (CheckRedundantInit(*this, Init, Members[Key])) 3251 HadError = true; 3252 } else { 3253 assert(Init->isDelegatingInitializer()); 3254 // This must be the only initializer 3255 if (i != 0 || NumMemInits > 1) { 3256 Diag(MemInits[0]->getSourceLocation(), 3257 diag::err_delegating_initializer_alone) 3258 << MemInits[0]->getSourceRange(); 3259 HadError = true; 3260 // We will treat this as being the only initializer. 3261 } 3262 SetDelegatingInitializer(Constructor, MemInits[i]); 3263 // Return immediately as the initializer is set. 3264 return; 3265 } 3266 } 3267 3268 if (HadError) 3269 return; 3270 3271 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3272 3273 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3274} 3275 3276void 3277Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3278 CXXRecordDecl *ClassDecl) { 3279 // Ignore dependent contexts. Also ignore unions, since their members never 3280 // have destructors implicitly called. 3281 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3282 return; 3283 3284 // FIXME: all the access-control diagnostics are positioned on the 3285 // field/base declaration. That's probably good; that said, the 3286 // user might reasonably want to know why the destructor is being 3287 // emitted, and we currently don't say. 3288 3289 // Non-static data members. 3290 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3291 E = ClassDecl->field_end(); I != E; ++I) { 3292 FieldDecl *Field = *I; 3293 if (Field->isInvalidDecl()) 3294 continue; 3295 3296 // Don't destroy incomplete or zero-length arrays. 3297 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3298 continue; 3299 3300 QualType FieldType = Context.getBaseElementType(Field->getType()); 3301 3302 const RecordType* RT = FieldType->getAs<RecordType>(); 3303 if (!RT) 3304 continue; 3305 3306 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3307 if (FieldClassDecl->isInvalidDecl()) 3308 continue; 3309 if (FieldClassDecl->hasIrrelevantDestructor()) 3310 continue; 3311 // The destructor for an implicit anonymous union member is never invoked. 3312 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3313 continue; 3314 3315 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3316 assert(Dtor && "No dtor found for FieldClassDecl!"); 3317 CheckDestructorAccess(Field->getLocation(), Dtor, 3318 PDiag(diag::err_access_dtor_field) 3319 << Field->getDeclName() 3320 << FieldType); 3321 3322 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3323 DiagnoseUseOfDecl(Dtor, Location); 3324 } 3325 3326 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3327 3328 // Bases. 3329 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3330 E = ClassDecl->bases_end(); Base != E; ++Base) { 3331 // Bases are always records in a well-formed non-dependent class. 3332 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3333 3334 // Remember direct virtual bases. 3335 if (Base->isVirtual()) 3336 DirectVirtualBases.insert(RT); 3337 3338 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3339 // If our base class is invalid, we probably can't get its dtor anyway. 3340 if (BaseClassDecl->isInvalidDecl()) 3341 continue; 3342 if (BaseClassDecl->hasIrrelevantDestructor()) 3343 continue; 3344 3345 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3346 assert(Dtor && "No dtor found for BaseClassDecl!"); 3347 3348 // FIXME: caret should be on the start of the class name 3349 CheckDestructorAccess(Base->getLocStart(), Dtor, 3350 PDiag(diag::err_access_dtor_base) 3351 << Base->getType() 3352 << Base->getSourceRange(), 3353 Context.getTypeDeclType(ClassDecl)); 3354 3355 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3356 DiagnoseUseOfDecl(Dtor, Location); 3357 } 3358 3359 // Virtual bases. 3360 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3361 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3362 3363 // Bases are always records in a well-formed non-dependent class. 3364 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3365 3366 // Ignore direct virtual bases. 3367 if (DirectVirtualBases.count(RT)) 3368 continue; 3369 3370 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3371 // If our base class is invalid, we probably can't get its dtor anyway. 3372 if (BaseClassDecl->isInvalidDecl()) 3373 continue; 3374 if (BaseClassDecl->hasIrrelevantDestructor()) 3375 continue; 3376 3377 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3378 assert(Dtor && "No dtor found for BaseClassDecl!"); 3379 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3380 PDiag(diag::err_access_dtor_vbase) 3381 << VBase->getType(), 3382 Context.getTypeDeclType(ClassDecl)); 3383 3384 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3385 DiagnoseUseOfDecl(Dtor, Location); 3386 } 3387} 3388 3389void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3390 if (!CDtorDecl) 3391 return; 3392 3393 if (CXXConstructorDecl *Constructor 3394 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3395 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3396} 3397 3398bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3399 unsigned DiagID, AbstractDiagSelID SelID) { 3400 if (SelID == -1) 3401 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3402 else 3403 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3404} 3405 3406bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3407 const PartialDiagnostic &PD) { 3408 if (!getLangOpts().CPlusPlus) 3409 return false; 3410 3411 if (const ArrayType *AT = Context.getAsArrayType(T)) 3412 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3413 3414 if (const PointerType *PT = T->getAs<PointerType>()) { 3415 // Find the innermost pointer type. 3416 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3417 PT = T; 3418 3419 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3420 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3421 } 3422 3423 const RecordType *RT = T->getAs<RecordType>(); 3424 if (!RT) 3425 return false; 3426 3427 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3428 3429 // We can't answer whether something is abstract until it has a 3430 // definition. If it's currently being defined, we'll walk back 3431 // over all the declarations when we have a full definition. 3432 const CXXRecordDecl *Def = RD->getDefinition(); 3433 if (!Def || Def->isBeingDefined()) 3434 return false; 3435 3436 if (!RD->isAbstract()) 3437 return false; 3438 3439 Diag(Loc, PD) << RD->getDeclName(); 3440 DiagnoseAbstractType(RD); 3441 3442 return true; 3443} 3444 3445void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3446 // Check if we've already emitted the list of pure virtual functions 3447 // for this class. 3448 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3449 return; 3450 3451 CXXFinalOverriderMap FinalOverriders; 3452 RD->getFinalOverriders(FinalOverriders); 3453 3454 // Keep a set of seen pure methods so we won't diagnose the same method 3455 // more than once. 3456 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3457 3458 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3459 MEnd = FinalOverriders.end(); 3460 M != MEnd; 3461 ++M) { 3462 for (OverridingMethods::iterator SO = M->second.begin(), 3463 SOEnd = M->second.end(); 3464 SO != SOEnd; ++SO) { 3465 // C++ [class.abstract]p4: 3466 // A class is abstract if it contains or inherits at least one 3467 // pure virtual function for which the final overrider is pure 3468 // virtual. 3469 3470 // 3471 if (SO->second.size() != 1) 3472 continue; 3473 3474 if (!SO->second.front().Method->isPure()) 3475 continue; 3476 3477 if (!SeenPureMethods.insert(SO->second.front().Method)) 3478 continue; 3479 3480 Diag(SO->second.front().Method->getLocation(), 3481 diag::note_pure_virtual_function) 3482 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3483 } 3484 } 3485 3486 if (!PureVirtualClassDiagSet) 3487 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3488 PureVirtualClassDiagSet->insert(RD); 3489} 3490 3491namespace { 3492struct AbstractUsageInfo { 3493 Sema &S; 3494 CXXRecordDecl *Record; 3495 CanQualType AbstractType; 3496 bool Invalid; 3497 3498 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3499 : S(S), Record(Record), 3500 AbstractType(S.Context.getCanonicalType( 3501 S.Context.getTypeDeclType(Record))), 3502 Invalid(false) {} 3503 3504 void DiagnoseAbstractType() { 3505 if (Invalid) return; 3506 S.DiagnoseAbstractType(Record); 3507 Invalid = true; 3508 } 3509 3510 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3511}; 3512 3513struct CheckAbstractUsage { 3514 AbstractUsageInfo &Info; 3515 const NamedDecl *Ctx; 3516 3517 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3518 : Info(Info), Ctx(Ctx) {} 3519 3520 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3521 switch (TL.getTypeLocClass()) { 3522#define ABSTRACT_TYPELOC(CLASS, PARENT) 3523#define TYPELOC(CLASS, PARENT) \ 3524 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3525#include "clang/AST/TypeLocNodes.def" 3526 } 3527 } 3528 3529 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3530 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3531 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3532 if (!TL.getArg(I)) 3533 continue; 3534 3535 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3536 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3537 } 3538 } 3539 3540 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3541 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3542 } 3543 3544 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3545 // Visit the type parameters from a permissive context. 3546 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3547 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3548 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3549 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3550 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3551 // TODO: other template argument types? 3552 } 3553 } 3554 3555 // Visit pointee types from a permissive context. 3556#define CheckPolymorphic(Type) \ 3557 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3558 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3559 } 3560 CheckPolymorphic(PointerTypeLoc) 3561 CheckPolymorphic(ReferenceTypeLoc) 3562 CheckPolymorphic(MemberPointerTypeLoc) 3563 CheckPolymorphic(BlockPointerTypeLoc) 3564 CheckPolymorphic(AtomicTypeLoc) 3565 3566 /// Handle all the types we haven't given a more specific 3567 /// implementation for above. 3568 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3569 // Every other kind of type that we haven't called out already 3570 // that has an inner type is either (1) sugar or (2) contains that 3571 // inner type in some way as a subobject. 3572 if (TypeLoc Next = TL.getNextTypeLoc()) 3573 return Visit(Next, Sel); 3574 3575 // If there's no inner type and we're in a permissive context, 3576 // don't diagnose. 3577 if (Sel == Sema::AbstractNone) return; 3578 3579 // Check whether the type matches the abstract type. 3580 QualType T = TL.getType(); 3581 if (T->isArrayType()) { 3582 Sel = Sema::AbstractArrayType; 3583 T = Info.S.Context.getBaseElementType(T); 3584 } 3585 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3586 if (CT != Info.AbstractType) return; 3587 3588 // It matched; do some magic. 3589 if (Sel == Sema::AbstractArrayType) { 3590 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3591 << T << TL.getSourceRange(); 3592 } else { 3593 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3594 << Sel << T << TL.getSourceRange(); 3595 } 3596 Info.DiagnoseAbstractType(); 3597 } 3598}; 3599 3600void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3601 Sema::AbstractDiagSelID Sel) { 3602 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3603} 3604 3605} 3606 3607/// Check for invalid uses of an abstract type in a method declaration. 3608static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3609 CXXMethodDecl *MD) { 3610 // No need to do the check on definitions, which require that 3611 // the return/param types be complete. 3612 if (MD->doesThisDeclarationHaveABody()) 3613 return; 3614 3615 // For safety's sake, just ignore it if we don't have type source 3616 // information. This should never happen for non-implicit methods, 3617 // but... 3618 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3619 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3620} 3621 3622/// Check for invalid uses of an abstract type within a class definition. 3623static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3624 CXXRecordDecl *RD) { 3625 for (CXXRecordDecl::decl_iterator 3626 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3627 Decl *D = *I; 3628 if (D->isImplicit()) continue; 3629 3630 // Methods and method templates. 3631 if (isa<CXXMethodDecl>(D)) { 3632 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3633 } else if (isa<FunctionTemplateDecl>(D)) { 3634 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3635 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3636 3637 // Fields and static variables. 3638 } else if (isa<FieldDecl>(D)) { 3639 FieldDecl *FD = cast<FieldDecl>(D); 3640 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3641 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3642 } else if (isa<VarDecl>(D)) { 3643 VarDecl *VD = cast<VarDecl>(D); 3644 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3645 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3646 3647 // Nested classes and class templates. 3648 } else if (isa<CXXRecordDecl>(D)) { 3649 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3650 } else if (isa<ClassTemplateDecl>(D)) { 3651 CheckAbstractClassUsage(Info, 3652 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3653 } 3654 } 3655} 3656 3657/// \brief Perform semantic checks on a class definition that has been 3658/// completing, introducing implicitly-declared members, checking for 3659/// abstract types, etc. 3660void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3661 if (!Record) 3662 return; 3663 3664 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3665 AbstractUsageInfo Info(*this, Record); 3666 CheckAbstractClassUsage(Info, Record); 3667 } 3668 3669 // If this is not an aggregate type and has no user-declared constructor, 3670 // complain about any non-static data members of reference or const scalar 3671 // type, since they will never get initializers. 3672 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3673 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3674 !Record->isLambda()) { 3675 bool Complained = false; 3676 for (RecordDecl::field_iterator F = Record->field_begin(), 3677 FEnd = Record->field_end(); 3678 F != FEnd; ++F) { 3679 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3680 continue; 3681 3682 if (F->getType()->isReferenceType() || 3683 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3684 if (!Complained) { 3685 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3686 << Record->getTagKind() << Record; 3687 Complained = true; 3688 } 3689 3690 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3691 << F->getType()->isReferenceType() 3692 << F->getDeclName(); 3693 } 3694 } 3695 } 3696 3697 if (Record->isDynamicClass() && !Record->isDependentType()) 3698 DynamicClasses.push_back(Record); 3699 3700 if (Record->getIdentifier()) { 3701 // C++ [class.mem]p13: 3702 // If T is the name of a class, then each of the following shall have a 3703 // name different from T: 3704 // - every member of every anonymous union that is a member of class T. 3705 // 3706 // C++ [class.mem]p14: 3707 // In addition, if class T has a user-declared constructor (12.1), every 3708 // non-static data member of class T shall have a name different from T. 3709 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3710 R.first != R.second; ++R.first) { 3711 NamedDecl *D = *R.first; 3712 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3713 isa<IndirectFieldDecl>(D)) { 3714 Diag(D->getLocation(), diag::err_member_name_of_class) 3715 << D->getDeclName(); 3716 break; 3717 } 3718 } 3719 } 3720 3721 // Warn if the class has virtual methods but non-virtual public destructor. 3722 if (Record->isPolymorphic() && !Record->isDependentType()) { 3723 CXXDestructorDecl *dtor = Record->getDestructor(); 3724 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3725 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3726 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3727 } 3728 3729 // See if a method overloads virtual methods in a base 3730 /// class without overriding any. 3731 if (!Record->isDependentType()) { 3732 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3733 MEnd = Record->method_end(); 3734 M != MEnd; ++M) { 3735 if (!(*M)->isStatic()) 3736 DiagnoseHiddenVirtualMethods(Record, *M); 3737 } 3738 } 3739 3740 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3741 // function that is not a constructor declares that member function to be 3742 // const. [...] The class of which that function is a member shall be 3743 // a literal type. 3744 // 3745 // If the class has virtual bases, any constexpr members will already have 3746 // been diagnosed by the checks performed on the member declaration, so 3747 // suppress this (less useful) diagnostic. 3748 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3749 !Record->isLiteral() && !Record->getNumVBases()) { 3750 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3751 MEnd = Record->method_end(); 3752 M != MEnd; ++M) { 3753 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3754 switch (Record->getTemplateSpecializationKind()) { 3755 case TSK_ImplicitInstantiation: 3756 case TSK_ExplicitInstantiationDeclaration: 3757 case TSK_ExplicitInstantiationDefinition: 3758 // If a template instantiates to a non-literal type, but its members 3759 // instantiate to constexpr functions, the template is technically 3760 // ill-formed, but we allow it for sanity. 3761 continue; 3762 3763 case TSK_Undeclared: 3764 case TSK_ExplicitSpecialization: 3765 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3766 PDiag(diag::err_constexpr_method_non_literal)); 3767 break; 3768 } 3769 3770 // Only produce one error per class. 3771 break; 3772 } 3773 } 3774 } 3775 3776 // Declare inherited constructors. We do this eagerly here because: 3777 // - The standard requires an eager diagnostic for conflicting inherited 3778 // constructors from different classes. 3779 // - The lazy declaration of the other implicit constructors is so as to not 3780 // waste space and performance on classes that are not meant to be 3781 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3782 // have inherited constructors. 3783 DeclareInheritedConstructors(Record); 3784 3785 if (!Record->isDependentType()) 3786 CheckExplicitlyDefaultedMethods(Record); 3787} 3788 3789void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3790 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3791 ME = Record->method_end(); 3792 MI != ME; ++MI) { 3793 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3794 switch (getSpecialMember(*MI)) { 3795 case CXXDefaultConstructor: 3796 CheckExplicitlyDefaultedDefaultConstructor( 3797 cast<CXXConstructorDecl>(*MI)); 3798 break; 3799 3800 case CXXDestructor: 3801 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3802 break; 3803 3804 case CXXCopyConstructor: 3805 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3806 break; 3807 3808 case CXXCopyAssignment: 3809 CheckExplicitlyDefaultedCopyAssignment(*MI); 3810 break; 3811 3812 case CXXMoveConstructor: 3813 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3814 break; 3815 3816 case CXXMoveAssignment: 3817 CheckExplicitlyDefaultedMoveAssignment(*MI); 3818 break; 3819 3820 case CXXInvalid: 3821 llvm_unreachable("non-special member explicitly defaulted!"); 3822 } 3823 } 3824 } 3825 3826} 3827 3828void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3829 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3830 3831 // Whether this was the first-declared instance of the constructor. 3832 // This affects whether we implicitly add an exception spec (and, eventually, 3833 // constexpr). It is also ill-formed to explicitly default a constructor such 3834 // that it would be deleted. (C++0x [decl.fct.def.default]) 3835 bool First = CD == CD->getCanonicalDecl(); 3836 3837 bool HadError = false; 3838 if (CD->getNumParams() != 0) { 3839 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3840 << CD->getSourceRange(); 3841 HadError = true; 3842 } 3843 3844 ImplicitExceptionSpecification Spec 3845 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3846 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3847 if (EPI.ExceptionSpecType == EST_Delayed) { 3848 // Exception specification depends on some deferred part of the class. We'll 3849 // try again when the class's definition has been fully processed. 3850 return; 3851 } 3852 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3853 *ExceptionType = Context.getFunctionType( 3854 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3855 3856 // C++11 [dcl.fct.def.default]p2: 3857 // An explicitly-defaulted function may be declared constexpr only if it 3858 // would have been implicitly declared as constexpr, 3859 // Do not apply this rule to templates, since core issue 1358 makes such 3860 // functions always instantiate to constexpr functions. 3861 if (CD->isConstexpr() && 3862 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3863 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3864 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3865 << CXXDefaultConstructor; 3866 HadError = true; 3867 } 3868 } 3869 // and may have an explicit exception-specification only if it is compatible 3870 // with the exception-specification on the implicit declaration. 3871 if (CtorType->hasExceptionSpec()) { 3872 if (CheckEquivalentExceptionSpec( 3873 PDiag(diag::err_incorrect_defaulted_exception_spec) 3874 << CXXDefaultConstructor, 3875 PDiag(), 3876 ExceptionType, SourceLocation(), 3877 CtorType, CD->getLocation())) { 3878 HadError = true; 3879 } 3880 } 3881 3882 // If a function is explicitly defaulted on its first declaration, 3883 if (First) { 3884 // -- it is implicitly considered to be constexpr if the implicit 3885 // definition would be, 3886 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3887 3888 // -- it is implicitly considered to have the same 3889 // exception-specification as if it had been implicitly declared 3890 // 3891 // FIXME: a compatible, but different, explicit exception specification 3892 // will be silently overridden. We should issue a warning if this happens. 3893 EPI.ExtInfo = CtorType->getExtInfo(); 3894 3895 // Such a function is also trivial if the implicitly-declared function 3896 // would have been. 3897 CD->setTrivial(CD->getParent()->hasTrivialDefaultConstructor()); 3898 } 3899 3900 if (HadError) { 3901 CD->setInvalidDecl(); 3902 return; 3903 } 3904 3905 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3906 if (First) { 3907 CD->setDeletedAsWritten(); 3908 } else { 3909 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3910 << CXXDefaultConstructor; 3911 CD->setInvalidDecl(); 3912 } 3913 } 3914} 3915 3916void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3917 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3918 3919 // Whether this was the first-declared instance of the constructor. 3920 bool First = CD == CD->getCanonicalDecl(); 3921 3922 bool HadError = false; 3923 if (CD->getNumParams() != 1) { 3924 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3925 << CD->getSourceRange(); 3926 HadError = true; 3927 } 3928 3929 ImplicitExceptionSpecification Spec(*this); 3930 bool Const; 3931 llvm::tie(Spec, Const) = 3932 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3933 3934 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3935 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3936 *ExceptionType = Context.getFunctionType( 3937 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3938 3939 // Check for parameter type matching. 3940 // This is a copy ctor so we know it's a cv-qualified reference to T. 3941 QualType ArgType = CtorType->getArgType(0); 3942 if (ArgType->getPointeeType().isVolatileQualified()) { 3943 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3944 HadError = true; 3945 } 3946 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3947 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3948 HadError = true; 3949 } 3950 3951 // C++11 [dcl.fct.def.default]p2: 3952 // An explicitly-defaulted function may be declared constexpr only if it 3953 // would have been implicitly declared as constexpr, 3954 // Do not apply this rule to templates, since core issue 1358 makes such 3955 // functions always instantiate to constexpr functions. 3956 if (CD->isConstexpr() && 3957 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3958 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3959 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3960 << CXXCopyConstructor; 3961 HadError = true; 3962 } 3963 } 3964 // and may have an explicit exception-specification only if it is compatible 3965 // with the exception-specification on the implicit declaration. 3966 if (CtorType->hasExceptionSpec()) { 3967 if (CheckEquivalentExceptionSpec( 3968 PDiag(diag::err_incorrect_defaulted_exception_spec) 3969 << CXXCopyConstructor, 3970 PDiag(), 3971 ExceptionType, SourceLocation(), 3972 CtorType, CD->getLocation())) { 3973 HadError = true; 3974 } 3975 } 3976 3977 // If a function is explicitly defaulted on its first declaration, 3978 if (First) { 3979 // -- it is implicitly considered to be constexpr if the implicit 3980 // definition would be, 3981 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3982 3983 // -- it is implicitly considered to have the same 3984 // exception-specification as if it had been implicitly declared, and 3985 // 3986 // FIXME: a compatible, but different, explicit exception specification 3987 // will be silently overridden. We should issue a warning if this happens. 3988 EPI.ExtInfo = CtorType->getExtInfo(); 3989 3990 // -- [...] it shall have the same parameter type as if it had been 3991 // implicitly declared. 3992 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3993 3994 // Such a function is also trivial if the implicitly-declared function 3995 // would have been. 3996 CD->setTrivial(CD->getParent()->hasTrivialCopyConstructor()); 3997 } 3998 3999 if (HadError) { 4000 CD->setInvalidDecl(); 4001 return; 4002 } 4003 4004 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 4005 if (First) { 4006 CD->setDeletedAsWritten(); 4007 } else { 4008 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4009 << CXXCopyConstructor; 4010 CD->setInvalidDecl(); 4011 } 4012 } 4013} 4014 4015void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 4016 assert(MD->isExplicitlyDefaulted()); 4017 4018 // Whether this was the first-declared instance of the operator 4019 bool First = MD == MD->getCanonicalDecl(); 4020 4021 bool HadError = false; 4022 if (MD->getNumParams() != 1) { 4023 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 4024 << MD->getSourceRange(); 4025 HadError = true; 4026 } 4027 4028 QualType ReturnType = 4029 MD->getType()->getAs<FunctionType>()->getResultType(); 4030 if (!ReturnType->isLValueReferenceType() || 4031 !Context.hasSameType( 4032 Context.getCanonicalType(ReturnType->getPointeeType()), 4033 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4034 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 4035 HadError = true; 4036 } 4037 4038 ImplicitExceptionSpecification Spec(*this); 4039 bool Const; 4040 llvm::tie(Spec, Const) = 4041 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 4042 4043 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4044 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4045 *ExceptionType = Context.getFunctionType( 4046 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4047 4048 QualType ArgType = OperType->getArgType(0); 4049 if (!ArgType->isLValueReferenceType()) { 4050 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4051 HadError = true; 4052 } else { 4053 if (ArgType->getPointeeType().isVolatileQualified()) { 4054 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 4055 HadError = true; 4056 } 4057 if (ArgType->getPointeeType().isConstQualified() && !Const) { 4058 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 4059 HadError = true; 4060 } 4061 } 4062 4063 if (OperType->getTypeQuals()) { 4064 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 4065 HadError = true; 4066 } 4067 4068 if (OperType->hasExceptionSpec()) { 4069 if (CheckEquivalentExceptionSpec( 4070 PDiag(diag::err_incorrect_defaulted_exception_spec) 4071 << CXXCopyAssignment, 4072 PDiag(), 4073 ExceptionType, SourceLocation(), 4074 OperType, MD->getLocation())) { 4075 HadError = true; 4076 } 4077 } 4078 if (First) { 4079 // We set the declaration to have the computed exception spec here. 4080 // We duplicate the one parameter type. 4081 EPI.RefQualifier = OperType->getRefQualifier(); 4082 EPI.ExtInfo = OperType->getExtInfo(); 4083 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4084 4085 // Such a function is also trivial if the implicitly-declared function 4086 // would have been. 4087 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 4088 } 4089 4090 if (HadError) { 4091 MD->setInvalidDecl(); 4092 return; 4093 } 4094 4095 if (ShouldDeleteSpecialMember(MD, CXXCopyAssignment)) { 4096 if (First) { 4097 MD->setDeletedAsWritten(); 4098 } else { 4099 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4100 << CXXCopyAssignment; 4101 MD->setInvalidDecl(); 4102 } 4103 } 4104} 4105 4106void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 4107 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 4108 4109 // Whether this was the first-declared instance of the constructor. 4110 bool First = CD == CD->getCanonicalDecl(); 4111 4112 bool HadError = false; 4113 if (CD->getNumParams() != 1) { 4114 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4115 << CD->getSourceRange(); 4116 HadError = true; 4117 } 4118 4119 ImplicitExceptionSpecification Spec( 4120 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4121 4122 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4123 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4124 *ExceptionType = Context.getFunctionType( 4125 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4126 4127 // Check for parameter type matching. 4128 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4129 QualType ArgType = CtorType->getArgType(0); 4130 if (ArgType->getPointeeType().isVolatileQualified()) { 4131 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4132 HadError = true; 4133 } 4134 if (ArgType->getPointeeType().isConstQualified()) { 4135 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4136 HadError = true; 4137 } 4138 4139 // C++11 [dcl.fct.def.default]p2: 4140 // An explicitly-defaulted function may be declared constexpr only if it 4141 // would have been implicitly declared as constexpr, 4142 // Do not apply this rule to templates, since core issue 1358 makes such 4143 // functions always instantiate to constexpr functions. 4144 if (CD->isConstexpr() && 4145 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4146 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4147 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4148 << CXXMoveConstructor; 4149 HadError = true; 4150 } 4151 } 4152 // and may have an explicit exception-specification only if it is compatible 4153 // with the exception-specification on the implicit declaration. 4154 if (CtorType->hasExceptionSpec()) { 4155 if (CheckEquivalentExceptionSpec( 4156 PDiag(diag::err_incorrect_defaulted_exception_spec) 4157 << CXXMoveConstructor, 4158 PDiag(), 4159 ExceptionType, SourceLocation(), 4160 CtorType, CD->getLocation())) { 4161 HadError = true; 4162 } 4163 } 4164 4165 // If a function is explicitly defaulted on its first declaration, 4166 if (First) { 4167 // -- it is implicitly considered to be constexpr if the implicit 4168 // definition would be, 4169 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4170 4171 // -- it is implicitly considered to have the same 4172 // exception-specification as if it had been implicitly declared, and 4173 // 4174 // FIXME: a compatible, but different, explicit exception specification 4175 // will be silently overridden. We should issue a warning if this happens. 4176 EPI.ExtInfo = CtorType->getExtInfo(); 4177 4178 // -- [...] it shall have the same parameter type as if it had been 4179 // implicitly declared. 4180 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4181 4182 // Such a function is also trivial if the implicitly-declared function 4183 // would have been. 4184 CD->setTrivial(CD->getParent()->hasTrivialMoveConstructor()); 4185 } 4186 4187 if (HadError) { 4188 CD->setInvalidDecl(); 4189 return; 4190 } 4191 4192 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4193 if (First) { 4194 CD->setDeletedAsWritten(); 4195 } else { 4196 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4197 << CXXMoveConstructor; 4198 CD->setInvalidDecl(); 4199 } 4200 } 4201} 4202 4203void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4204 assert(MD->isExplicitlyDefaulted()); 4205 4206 // Whether this was the first-declared instance of the operator 4207 bool First = MD == MD->getCanonicalDecl(); 4208 4209 bool HadError = false; 4210 if (MD->getNumParams() != 1) { 4211 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4212 << MD->getSourceRange(); 4213 HadError = true; 4214 } 4215 4216 QualType ReturnType = 4217 MD->getType()->getAs<FunctionType>()->getResultType(); 4218 if (!ReturnType->isLValueReferenceType() || 4219 !Context.hasSameType( 4220 Context.getCanonicalType(ReturnType->getPointeeType()), 4221 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4222 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4223 HadError = true; 4224 } 4225 4226 ImplicitExceptionSpecification Spec( 4227 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4228 4229 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4230 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4231 *ExceptionType = Context.getFunctionType( 4232 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4233 4234 QualType ArgType = OperType->getArgType(0); 4235 if (!ArgType->isRValueReferenceType()) { 4236 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4237 HadError = true; 4238 } else { 4239 if (ArgType->getPointeeType().isVolatileQualified()) { 4240 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4241 HadError = true; 4242 } 4243 if (ArgType->getPointeeType().isConstQualified()) { 4244 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4245 HadError = true; 4246 } 4247 } 4248 4249 if (OperType->getTypeQuals()) { 4250 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4251 HadError = true; 4252 } 4253 4254 if (OperType->hasExceptionSpec()) { 4255 if (CheckEquivalentExceptionSpec( 4256 PDiag(diag::err_incorrect_defaulted_exception_spec) 4257 << CXXMoveAssignment, 4258 PDiag(), 4259 ExceptionType, SourceLocation(), 4260 OperType, MD->getLocation())) { 4261 HadError = true; 4262 } 4263 } 4264 if (First) { 4265 // We set the declaration to have the computed exception spec here. 4266 // We duplicate the one parameter type. 4267 EPI.RefQualifier = OperType->getRefQualifier(); 4268 EPI.ExtInfo = OperType->getExtInfo(); 4269 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4270 4271 // Such a function is also trivial if the implicitly-declared function 4272 // would have been. 4273 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 4274 } 4275 4276 if (HadError) { 4277 MD->setInvalidDecl(); 4278 return; 4279 } 4280 4281 if (ShouldDeleteSpecialMember(MD, CXXMoveAssignment)) { 4282 if (First) { 4283 MD->setDeletedAsWritten(); 4284 } else { 4285 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4286 << CXXMoveAssignment; 4287 MD->setInvalidDecl(); 4288 } 4289 } 4290} 4291 4292void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4293 assert(DD->isExplicitlyDefaulted()); 4294 4295 // Whether this was the first-declared instance of the destructor. 4296 bool First = DD == DD->getCanonicalDecl(); 4297 4298 ImplicitExceptionSpecification Spec 4299 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4300 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4301 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4302 *ExceptionType = Context.getFunctionType( 4303 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4304 4305 if (DtorType->hasExceptionSpec()) { 4306 if (CheckEquivalentExceptionSpec( 4307 PDiag(diag::err_incorrect_defaulted_exception_spec) 4308 << CXXDestructor, 4309 PDiag(), 4310 ExceptionType, SourceLocation(), 4311 DtorType, DD->getLocation())) { 4312 DD->setInvalidDecl(); 4313 return; 4314 } 4315 } 4316 if (First) { 4317 // We set the declaration to have the computed exception spec here. 4318 // There are no parameters. 4319 EPI.ExtInfo = DtorType->getExtInfo(); 4320 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4321 4322 // Such a function is also trivial if the implicitly-declared function 4323 // would have been. 4324 DD->setTrivial(DD->getParent()->hasTrivialDestructor()); 4325 } 4326 4327 if (ShouldDeleteSpecialMember(DD, CXXDestructor)) { 4328 if (First) { 4329 DD->setDeletedAsWritten(); 4330 } else { 4331 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4332 << CXXDestructor; 4333 DD->setInvalidDecl(); 4334 } 4335 } 4336} 4337 4338namespace { 4339struct SpecialMemberDeletionInfo { 4340 Sema &S; 4341 CXXMethodDecl *MD; 4342 Sema::CXXSpecialMember CSM; 4343 bool Diagnose; 4344 4345 // Properties of the special member, computed for convenience. 4346 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4347 SourceLocation Loc; 4348 4349 bool AllFieldsAreConst; 4350 4351 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4352 Sema::CXXSpecialMember CSM, bool Diagnose) 4353 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4354 IsConstructor(false), IsAssignment(false), IsMove(false), 4355 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4356 AllFieldsAreConst(true) { 4357 switch (CSM) { 4358 case Sema::CXXDefaultConstructor: 4359 case Sema::CXXCopyConstructor: 4360 IsConstructor = true; 4361 break; 4362 case Sema::CXXMoveConstructor: 4363 IsConstructor = true; 4364 IsMove = true; 4365 break; 4366 case Sema::CXXCopyAssignment: 4367 IsAssignment = true; 4368 break; 4369 case Sema::CXXMoveAssignment: 4370 IsAssignment = true; 4371 IsMove = true; 4372 break; 4373 case Sema::CXXDestructor: 4374 break; 4375 case Sema::CXXInvalid: 4376 llvm_unreachable("invalid special member kind"); 4377 } 4378 4379 if (MD->getNumParams()) { 4380 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4381 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4382 } 4383 } 4384 4385 bool inUnion() const { return MD->getParent()->isUnion(); } 4386 4387 /// Look up the corresponding special member in the given class. 4388 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class) { 4389 unsigned TQ = MD->getTypeQualifiers(); 4390 return S.LookupSpecialMember(Class, CSM, ConstArg, VolatileArg, 4391 MD->getRefQualifier() == RQ_RValue, 4392 TQ & Qualifiers::Const, 4393 TQ & Qualifiers::Volatile); 4394 } 4395 4396 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4397 4398 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4399 bool shouldDeleteForField(FieldDecl *FD); 4400 bool shouldDeleteForAllConstMembers(); 4401 4402 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj); 4403 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4404 Sema::SpecialMemberOverloadResult *SMOR, 4405 bool IsDtorCallInCtor); 4406 4407 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4408}; 4409} 4410 4411/// Is the given special member inaccessible when used on the given 4412/// sub-object. 4413bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4414 CXXMethodDecl *target) { 4415 /// If we're operating on a base class, the object type is the 4416 /// type of this special member. 4417 QualType objectTy; 4418 AccessSpecifier access = target->getAccess();; 4419 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4420 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4421 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4422 4423 // If we're operating on a field, the object type is the type of the field. 4424 } else { 4425 objectTy = S.Context.getTypeDeclType(target->getParent()); 4426 } 4427 4428 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4429} 4430 4431/// Check whether we should delete a special member due to the implicit 4432/// definition containing a call to a special member of a subobject. 4433bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4434 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4435 bool IsDtorCallInCtor) { 4436 CXXMethodDecl *Decl = SMOR->getMethod(); 4437 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4438 4439 int DiagKind = -1; 4440 4441 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4442 DiagKind = !Decl ? 0 : 1; 4443 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4444 DiagKind = 2; 4445 else if (!isAccessible(Subobj, Decl)) 4446 DiagKind = 3; 4447 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4448 !Decl->isTrivial()) { 4449 // A member of a union must have a trivial corresponding special member. 4450 // As a weird special case, a destructor call from a union's constructor 4451 // must be accessible and non-deleted, but need not be trivial. Such a 4452 // destructor is never actually called, but is semantically checked as 4453 // if it were. 4454 DiagKind = 4; 4455 } 4456 4457 if (DiagKind == -1) 4458 return false; 4459 4460 if (Diagnose) { 4461 if (Field) { 4462 S.Diag(Field->getLocation(), 4463 diag::note_deleted_special_member_class_subobject) 4464 << CSM << MD->getParent() << /*IsField*/true 4465 << Field << DiagKind << IsDtorCallInCtor; 4466 } else { 4467 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4468 S.Diag(Base->getLocStart(), 4469 diag::note_deleted_special_member_class_subobject) 4470 << CSM << MD->getParent() << /*IsField*/false 4471 << Base->getType() << DiagKind << IsDtorCallInCtor; 4472 } 4473 4474 if (DiagKind == 1) 4475 S.NoteDeletedFunction(Decl); 4476 // FIXME: Explain inaccessibility if DiagKind == 3. 4477 } 4478 4479 return true; 4480} 4481 4482/// Check whether we should delete a special member function due to having a 4483/// direct or virtual base class or static data member of class type M. 4484bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4485 CXXRecordDecl *Class, Subobject Subobj) { 4486 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4487 4488 // C++11 [class.ctor]p5: 4489 // -- any direct or virtual base class, or non-static data member with no 4490 // brace-or-equal-initializer, has class type M (or array thereof) and 4491 // either M has no default constructor or overload resolution as applied 4492 // to M's default constructor results in an ambiguity or in a function 4493 // that is deleted or inaccessible 4494 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4495 // -- a direct or virtual base class B that cannot be copied/moved because 4496 // overload resolution, as applied to B's corresponding special member, 4497 // results in an ambiguity or a function that is deleted or inaccessible 4498 // from the defaulted special member 4499 // C++11 [class.dtor]p5: 4500 // -- any direct or virtual base class [...] has a type with a destructor 4501 // that is deleted or inaccessible 4502 if (!(CSM == Sema::CXXDefaultConstructor && 4503 Field && Field->hasInClassInitializer()) && 4504 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class), false)) 4505 return true; 4506 4507 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4508 // -- any direct or virtual base class or non-static data member has a 4509 // type with a destructor that is deleted or inaccessible 4510 if (IsConstructor) { 4511 Sema::SpecialMemberOverloadResult *SMOR = 4512 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4513 false, false, false, false, false); 4514 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4515 return true; 4516 } 4517 4518 return false; 4519} 4520 4521/// Check whether we should delete a special member function due to the class 4522/// having a particular direct or virtual base class. 4523bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4524 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4525 return shouldDeleteForClassSubobject(BaseClass, Base); 4526} 4527 4528/// Check whether we should delete a special member function due to the class 4529/// having a particular non-static data member. 4530bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4531 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4532 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4533 4534 if (CSM == Sema::CXXDefaultConstructor) { 4535 // For a default constructor, all references must be initialized in-class 4536 // and, if a union, it must have a non-const member. 4537 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4538 if (Diagnose) 4539 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4540 << MD->getParent() << FD << FieldType << /*Reference*/0; 4541 return true; 4542 } 4543 // C++11 [class.ctor]p5: any non-variant non-static data member of 4544 // const-qualified type (or array thereof) with no 4545 // brace-or-equal-initializer does not have a user-provided default 4546 // constructor. 4547 if (!inUnion() && FieldType.isConstQualified() && 4548 !FD->hasInClassInitializer() && 4549 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4550 if (Diagnose) 4551 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4552 << MD->getParent() << FD << FieldType << /*Const*/1; 4553 return true; 4554 } 4555 4556 if (inUnion() && !FieldType.isConstQualified()) 4557 AllFieldsAreConst = false; 4558 } else if (CSM == Sema::CXXCopyConstructor) { 4559 // For a copy constructor, data members must not be of rvalue reference 4560 // type. 4561 if (FieldType->isRValueReferenceType()) { 4562 if (Diagnose) 4563 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4564 << MD->getParent() << FD << FieldType; 4565 return true; 4566 } 4567 } else if (IsAssignment) { 4568 // For an assignment operator, data members must not be of reference type. 4569 if (FieldType->isReferenceType()) { 4570 if (Diagnose) 4571 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4572 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4573 return true; 4574 } 4575 if (!FieldRecord && FieldType.isConstQualified()) { 4576 // C++11 [class.copy]p23: 4577 // -- a non-static data member of const non-class type (or array thereof) 4578 if (Diagnose) 4579 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4580 << IsMove << MD->getParent() << FD << FieldType << /*Const*/1; 4581 return true; 4582 } 4583 } 4584 4585 if (FieldRecord) { 4586 // Some additional restrictions exist on the variant members. 4587 if (!inUnion() && FieldRecord->isUnion() && 4588 FieldRecord->isAnonymousStructOrUnion()) { 4589 bool AllVariantFieldsAreConst = true; 4590 4591 // FIXME: Handle anonymous unions declared within anonymous unions. 4592 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4593 UE = FieldRecord->field_end(); 4594 UI != UE; ++UI) { 4595 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4596 4597 if (!UnionFieldType.isConstQualified()) 4598 AllVariantFieldsAreConst = false; 4599 4600 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4601 if (UnionFieldRecord && 4602 shouldDeleteForClassSubobject(UnionFieldRecord, *UI)) 4603 return true; 4604 } 4605 4606 // At least one member in each anonymous union must be non-const 4607 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4608 FieldRecord->field_begin() != FieldRecord->field_end()) { 4609 if (Diagnose) 4610 S.Diag(FieldRecord->getLocation(), 4611 diag::note_deleted_default_ctor_all_const) 4612 << MD->getParent() << /*anonymous union*/1; 4613 return true; 4614 } 4615 4616 // Don't check the implicit member of the anonymous union type. 4617 // This is technically non-conformant, but sanity demands it. 4618 return false; 4619 } 4620 4621 if (shouldDeleteForClassSubobject(FieldRecord, FD)) 4622 return true; 4623 } 4624 4625 return false; 4626} 4627 4628/// C++11 [class.ctor] p5: 4629/// A defaulted default constructor for a class X is defined as deleted if 4630/// X is a union and all of its variant members are of const-qualified type. 4631bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4632 // This is a silly definition, because it gives an empty union a deleted 4633 // default constructor. Don't do that. 4634 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4635 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4636 if (Diagnose) 4637 S.Diag(MD->getParent()->getLocation(), 4638 diag::note_deleted_default_ctor_all_const) 4639 << MD->getParent() << /*not anonymous union*/0; 4640 return true; 4641 } 4642 return false; 4643} 4644 4645/// Determine whether a defaulted special member function should be defined as 4646/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4647/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4648bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4649 bool Diagnose) { 4650 assert(!MD->isInvalidDecl()); 4651 CXXRecordDecl *RD = MD->getParent(); 4652 assert(!RD->isDependentType() && "do deletion after instantiation"); 4653 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4654 return false; 4655 4656 // C++11 [expr.lambda.prim]p19: 4657 // The closure type associated with a lambda-expression has a 4658 // deleted (8.4.3) default constructor and a deleted copy 4659 // assignment operator. 4660 if (RD->isLambda() && 4661 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4662 if (Diagnose) 4663 Diag(RD->getLocation(), diag::note_lambda_decl); 4664 return true; 4665 } 4666 4667 // For an anonymous struct or union, the copy and assignment special members 4668 // will never be used, so skip the check. For an anonymous union declared at 4669 // namespace scope, the constructor and destructor are used. 4670 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4671 RD->isAnonymousStructOrUnion()) 4672 return false; 4673 4674 // C++11 [class.copy]p7, p18: 4675 // If the class definition declares a move constructor or move assignment 4676 // operator, an implicitly declared copy constructor or copy assignment 4677 // operator is defined as deleted. 4678 if (MD->isImplicit() && 4679 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4680 CXXMethodDecl *UserDeclaredMove = 0; 4681 4682 // In Microsoft mode, a user-declared move only causes the deletion of the 4683 // corresponding copy operation, not both copy operations. 4684 if (RD->hasUserDeclaredMoveConstructor() && 4685 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4686 if (!Diagnose) return true; 4687 UserDeclaredMove = RD->getMoveConstructor(); 4688 assert(UserDeclaredMove); 4689 } else if (RD->hasUserDeclaredMoveAssignment() && 4690 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4691 if (!Diagnose) return true; 4692 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4693 assert(UserDeclaredMove); 4694 } 4695 4696 if (UserDeclaredMove) { 4697 Diag(UserDeclaredMove->getLocation(), 4698 diag::note_deleted_copy_user_declared_move) 4699 << (CSM == CXXCopyAssignment) << RD 4700 << UserDeclaredMove->isMoveAssignmentOperator(); 4701 return true; 4702 } 4703 } 4704 4705 // Do access control from the special member function 4706 ContextRAII MethodContext(*this, MD); 4707 4708 // C++11 [class.dtor]p5: 4709 // -- for a virtual destructor, lookup of the non-array deallocation function 4710 // results in an ambiguity or in a function that is deleted or inaccessible 4711 if (CSM == CXXDestructor && MD->isVirtual()) { 4712 FunctionDecl *OperatorDelete = 0; 4713 DeclarationName Name = 4714 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4715 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4716 OperatorDelete, false)) { 4717 if (Diagnose) 4718 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4719 return true; 4720 } 4721 } 4722 4723 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4724 4725 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4726 BE = RD->bases_end(); BI != BE; ++BI) 4727 if (!BI->isVirtual() && 4728 SMI.shouldDeleteForBase(BI)) 4729 return true; 4730 4731 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4732 BE = RD->vbases_end(); BI != BE; ++BI) 4733 if (SMI.shouldDeleteForBase(BI)) 4734 return true; 4735 4736 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4737 FE = RD->field_end(); FI != FE; ++FI) 4738 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4739 SMI.shouldDeleteForField(*FI)) 4740 return true; 4741 4742 if (SMI.shouldDeleteForAllConstMembers()) 4743 return true; 4744 4745 return false; 4746} 4747 4748/// \brief Data used with FindHiddenVirtualMethod 4749namespace { 4750 struct FindHiddenVirtualMethodData { 4751 Sema *S; 4752 CXXMethodDecl *Method; 4753 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4754 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4755 }; 4756} 4757 4758/// \brief Member lookup function that determines whether a given C++ 4759/// method overloads virtual methods in a base class without overriding any, 4760/// to be used with CXXRecordDecl::lookupInBases(). 4761static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4762 CXXBasePath &Path, 4763 void *UserData) { 4764 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4765 4766 FindHiddenVirtualMethodData &Data 4767 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4768 4769 DeclarationName Name = Data.Method->getDeclName(); 4770 assert(Name.getNameKind() == DeclarationName::Identifier); 4771 4772 bool foundSameNameMethod = false; 4773 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4774 for (Path.Decls = BaseRecord->lookup(Name); 4775 Path.Decls.first != Path.Decls.second; 4776 ++Path.Decls.first) { 4777 NamedDecl *D = *Path.Decls.first; 4778 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4779 MD = MD->getCanonicalDecl(); 4780 foundSameNameMethod = true; 4781 // Interested only in hidden virtual methods. 4782 if (!MD->isVirtual()) 4783 continue; 4784 // If the method we are checking overrides a method from its base 4785 // don't warn about the other overloaded methods. 4786 if (!Data.S->IsOverload(Data.Method, MD, false)) 4787 return true; 4788 // Collect the overload only if its hidden. 4789 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4790 overloadedMethods.push_back(MD); 4791 } 4792 } 4793 4794 if (foundSameNameMethod) 4795 Data.OverloadedMethods.append(overloadedMethods.begin(), 4796 overloadedMethods.end()); 4797 return foundSameNameMethod; 4798} 4799 4800/// \brief See if a method overloads virtual methods in a base class without 4801/// overriding any. 4802void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4803 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4804 MD->getLocation()) == DiagnosticsEngine::Ignored) 4805 return; 4806 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4807 return; 4808 4809 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4810 /*bool RecordPaths=*/false, 4811 /*bool DetectVirtual=*/false); 4812 FindHiddenVirtualMethodData Data; 4813 Data.Method = MD; 4814 Data.S = this; 4815 4816 // Keep the base methods that were overriden or introduced in the subclass 4817 // by 'using' in a set. A base method not in this set is hidden. 4818 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4819 res.first != res.second; ++res.first) { 4820 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4821 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4822 E = MD->end_overridden_methods(); 4823 I != E; ++I) 4824 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4825 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4826 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4827 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4828 } 4829 4830 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4831 !Data.OverloadedMethods.empty()) { 4832 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4833 << MD << (Data.OverloadedMethods.size() > 1); 4834 4835 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4836 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4837 Diag(overloadedMD->getLocation(), 4838 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4839 } 4840 } 4841} 4842 4843void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4844 Decl *TagDecl, 4845 SourceLocation LBrac, 4846 SourceLocation RBrac, 4847 AttributeList *AttrList) { 4848 if (!TagDecl) 4849 return; 4850 4851 AdjustDeclIfTemplate(TagDecl); 4852 4853 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4854 // strict aliasing violation! 4855 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4856 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4857 4858 CheckCompletedCXXClass( 4859 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4860} 4861 4862/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4863/// special functions, such as the default constructor, copy 4864/// constructor, or destructor, to the given C++ class (C++ 4865/// [special]p1). This routine can only be executed just before the 4866/// definition of the class is complete. 4867void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4868 if (!ClassDecl->hasUserDeclaredConstructor()) 4869 ++ASTContext::NumImplicitDefaultConstructors; 4870 4871 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4872 ++ASTContext::NumImplicitCopyConstructors; 4873 4874 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4875 ++ASTContext::NumImplicitMoveConstructors; 4876 4877 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4878 ++ASTContext::NumImplicitCopyAssignmentOperators; 4879 4880 // If we have a dynamic class, then the copy assignment operator may be 4881 // virtual, so we have to declare it immediately. This ensures that, e.g., 4882 // it shows up in the right place in the vtable and that we diagnose 4883 // problems with the implicit exception specification. 4884 if (ClassDecl->isDynamicClass()) 4885 DeclareImplicitCopyAssignment(ClassDecl); 4886 } 4887 4888 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4889 ++ASTContext::NumImplicitMoveAssignmentOperators; 4890 4891 // Likewise for the move assignment operator. 4892 if (ClassDecl->isDynamicClass()) 4893 DeclareImplicitMoveAssignment(ClassDecl); 4894 } 4895 4896 if (!ClassDecl->hasUserDeclaredDestructor()) { 4897 ++ASTContext::NumImplicitDestructors; 4898 4899 // If we have a dynamic class, then the destructor may be virtual, so we 4900 // have to declare the destructor immediately. This ensures that, e.g., it 4901 // shows up in the right place in the vtable and that we diagnose problems 4902 // with the implicit exception specification. 4903 if (ClassDecl->isDynamicClass()) 4904 DeclareImplicitDestructor(ClassDecl); 4905 } 4906} 4907 4908void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4909 if (!D) 4910 return; 4911 4912 int NumParamList = D->getNumTemplateParameterLists(); 4913 for (int i = 0; i < NumParamList; i++) { 4914 TemplateParameterList* Params = D->getTemplateParameterList(i); 4915 for (TemplateParameterList::iterator Param = Params->begin(), 4916 ParamEnd = Params->end(); 4917 Param != ParamEnd; ++Param) { 4918 NamedDecl *Named = cast<NamedDecl>(*Param); 4919 if (Named->getDeclName()) { 4920 S->AddDecl(Named); 4921 IdResolver.AddDecl(Named); 4922 } 4923 } 4924 } 4925} 4926 4927void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4928 if (!D) 4929 return; 4930 4931 TemplateParameterList *Params = 0; 4932 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4933 Params = Template->getTemplateParameters(); 4934 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4935 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4936 Params = PartialSpec->getTemplateParameters(); 4937 else 4938 return; 4939 4940 for (TemplateParameterList::iterator Param = Params->begin(), 4941 ParamEnd = Params->end(); 4942 Param != ParamEnd; ++Param) { 4943 NamedDecl *Named = cast<NamedDecl>(*Param); 4944 if (Named->getDeclName()) { 4945 S->AddDecl(Named); 4946 IdResolver.AddDecl(Named); 4947 } 4948 } 4949} 4950 4951void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4952 if (!RecordD) return; 4953 AdjustDeclIfTemplate(RecordD); 4954 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4955 PushDeclContext(S, Record); 4956} 4957 4958void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4959 if (!RecordD) return; 4960 PopDeclContext(); 4961} 4962 4963/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4964/// parsing a top-level (non-nested) C++ class, and we are now 4965/// parsing those parts of the given Method declaration that could 4966/// not be parsed earlier (C++ [class.mem]p2), such as default 4967/// arguments. This action should enter the scope of the given 4968/// Method declaration as if we had just parsed the qualified method 4969/// name. However, it should not bring the parameters into scope; 4970/// that will be performed by ActOnDelayedCXXMethodParameter. 4971void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4972} 4973 4974/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4975/// C++ method declaration. We're (re-)introducing the given 4976/// function parameter into scope for use in parsing later parts of 4977/// the method declaration. For example, we could see an 4978/// ActOnParamDefaultArgument event for this parameter. 4979void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4980 if (!ParamD) 4981 return; 4982 4983 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4984 4985 // If this parameter has an unparsed default argument, clear it out 4986 // to make way for the parsed default argument. 4987 if (Param->hasUnparsedDefaultArg()) 4988 Param->setDefaultArg(0); 4989 4990 S->AddDecl(Param); 4991 if (Param->getDeclName()) 4992 IdResolver.AddDecl(Param); 4993} 4994 4995/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4996/// processing the delayed method declaration for Method. The method 4997/// declaration is now considered finished. There may be a separate 4998/// ActOnStartOfFunctionDef action later (not necessarily 4999/// immediately!) for this method, if it was also defined inside the 5000/// class body. 5001void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5002 if (!MethodD) 5003 return; 5004 5005 AdjustDeclIfTemplate(MethodD); 5006 5007 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5008 5009 // Now that we have our default arguments, check the constructor 5010 // again. It could produce additional diagnostics or affect whether 5011 // the class has implicitly-declared destructors, among other 5012 // things. 5013 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5014 CheckConstructor(Constructor); 5015 5016 // Check the default arguments, which we may have added. 5017 if (!Method->isInvalidDecl()) 5018 CheckCXXDefaultArguments(Method); 5019} 5020 5021/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5022/// the well-formedness of the constructor declarator @p D with type @p 5023/// R. If there are any errors in the declarator, this routine will 5024/// emit diagnostics and set the invalid bit to true. In any case, the type 5025/// will be updated to reflect a well-formed type for the constructor and 5026/// returned. 5027QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5028 StorageClass &SC) { 5029 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5030 5031 // C++ [class.ctor]p3: 5032 // A constructor shall not be virtual (10.3) or static (9.4). A 5033 // constructor can be invoked for a const, volatile or const 5034 // volatile object. A constructor shall not be declared const, 5035 // volatile, or const volatile (9.3.2). 5036 if (isVirtual) { 5037 if (!D.isInvalidType()) 5038 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5039 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5040 << SourceRange(D.getIdentifierLoc()); 5041 D.setInvalidType(); 5042 } 5043 if (SC == SC_Static) { 5044 if (!D.isInvalidType()) 5045 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5046 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5047 << SourceRange(D.getIdentifierLoc()); 5048 D.setInvalidType(); 5049 SC = SC_None; 5050 } 5051 5052 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5053 if (FTI.TypeQuals != 0) { 5054 if (FTI.TypeQuals & Qualifiers::Const) 5055 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5056 << "const" << SourceRange(D.getIdentifierLoc()); 5057 if (FTI.TypeQuals & Qualifiers::Volatile) 5058 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5059 << "volatile" << SourceRange(D.getIdentifierLoc()); 5060 if (FTI.TypeQuals & Qualifiers::Restrict) 5061 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5062 << "restrict" << SourceRange(D.getIdentifierLoc()); 5063 D.setInvalidType(); 5064 } 5065 5066 // C++0x [class.ctor]p4: 5067 // A constructor shall not be declared with a ref-qualifier. 5068 if (FTI.hasRefQualifier()) { 5069 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5070 << FTI.RefQualifierIsLValueRef 5071 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5072 D.setInvalidType(); 5073 } 5074 5075 // Rebuild the function type "R" without any type qualifiers (in 5076 // case any of the errors above fired) and with "void" as the 5077 // return type, since constructors don't have return types. 5078 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5079 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5080 return R; 5081 5082 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5083 EPI.TypeQuals = 0; 5084 EPI.RefQualifier = RQ_None; 5085 5086 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5087 Proto->getNumArgs(), EPI); 5088} 5089 5090/// CheckConstructor - Checks a fully-formed constructor for 5091/// well-formedness, issuing any diagnostics required. Returns true if 5092/// the constructor declarator is invalid. 5093void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5094 CXXRecordDecl *ClassDecl 5095 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5096 if (!ClassDecl) 5097 return Constructor->setInvalidDecl(); 5098 5099 // C++ [class.copy]p3: 5100 // A declaration of a constructor for a class X is ill-formed if 5101 // its first parameter is of type (optionally cv-qualified) X and 5102 // either there are no other parameters or else all other 5103 // parameters have default arguments. 5104 if (!Constructor->isInvalidDecl() && 5105 ((Constructor->getNumParams() == 1) || 5106 (Constructor->getNumParams() > 1 && 5107 Constructor->getParamDecl(1)->hasDefaultArg())) && 5108 Constructor->getTemplateSpecializationKind() 5109 != TSK_ImplicitInstantiation) { 5110 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5111 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5112 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5113 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5114 const char *ConstRef 5115 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5116 : " const &"; 5117 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5118 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5119 5120 // FIXME: Rather that making the constructor invalid, we should endeavor 5121 // to fix the type. 5122 Constructor->setInvalidDecl(); 5123 } 5124 } 5125} 5126 5127/// CheckDestructor - Checks a fully-formed destructor definition for 5128/// well-formedness, issuing any diagnostics required. Returns true 5129/// on error. 5130bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5131 CXXRecordDecl *RD = Destructor->getParent(); 5132 5133 if (Destructor->isVirtual()) { 5134 SourceLocation Loc; 5135 5136 if (!Destructor->isImplicit()) 5137 Loc = Destructor->getLocation(); 5138 else 5139 Loc = RD->getLocation(); 5140 5141 // If we have a virtual destructor, look up the deallocation function 5142 FunctionDecl *OperatorDelete = 0; 5143 DeclarationName Name = 5144 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5145 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5146 return true; 5147 5148 MarkFunctionReferenced(Loc, OperatorDelete); 5149 5150 Destructor->setOperatorDelete(OperatorDelete); 5151 } 5152 5153 return false; 5154} 5155 5156static inline bool 5157FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5158 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5159 FTI.ArgInfo[0].Param && 5160 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5161} 5162 5163/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5164/// the well-formednes of the destructor declarator @p D with type @p 5165/// R. If there are any errors in the declarator, this routine will 5166/// emit diagnostics and set the declarator to invalid. Even if this happens, 5167/// will be updated to reflect a well-formed type for the destructor and 5168/// returned. 5169QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5170 StorageClass& SC) { 5171 // C++ [class.dtor]p1: 5172 // [...] A typedef-name that names a class is a class-name 5173 // (7.1.3); however, a typedef-name that names a class shall not 5174 // be used as the identifier in the declarator for a destructor 5175 // declaration. 5176 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5177 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5178 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5179 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5180 else if (const TemplateSpecializationType *TST = 5181 DeclaratorType->getAs<TemplateSpecializationType>()) 5182 if (TST->isTypeAlias()) 5183 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5184 << DeclaratorType << 1; 5185 5186 // C++ [class.dtor]p2: 5187 // A destructor is used to destroy objects of its class type. A 5188 // destructor takes no parameters, and no return type can be 5189 // specified for it (not even void). The address of a destructor 5190 // shall not be taken. A destructor shall not be static. A 5191 // destructor can be invoked for a const, volatile or const 5192 // volatile object. A destructor shall not be declared const, 5193 // volatile or const volatile (9.3.2). 5194 if (SC == SC_Static) { 5195 if (!D.isInvalidType()) 5196 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5197 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5198 << SourceRange(D.getIdentifierLoc()) 5199 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5200 5201 SC = SC_None; 5202 } 5203 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5204 // Destructors don't have return types, but the parser will 5205 // happily parse something like: 5206 // 5207 // class X { 5208 // float ~X(); 5209 // }; 5210 // 5211 // The return type will be eliminated later. 5212 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5213 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5214 << SourceRange(D.getIdentifierLoc()); 5215 } 5216 5217 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5218 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5219 if (FTI.TypeQuals & Qualifiers::Const) 5220 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5221 << "const" << SourceRange(D.getIdentifierLoc()); 5222 if (FTI.TypeQuals & Qualifiers::Volatile) 5223 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5224 << "volatile" << SourceRange(D.getIdentifierLoc()); 5225 if (FTI.TypeQuals & Qualifiers::Restrict) 5226 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5227 << "restrict" << SourceRange(D.getIdentifierLoc()); 5228 D.setInvalidType(); 5229 } 5230 5231 // C++0x [class.dtor]p2: 5232 // A destructor shall not be declared with a ref-qualifier. 5233 if (FTI.hasRefQualifier()) { 5234 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5235 << FTI.RefQualifierIsLValueRef 5236 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5237 D.setInvalidType(); 5238 } 5239 5240 // Make sure we don't have any parameters. 5241 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5242 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5243 5244 // Delete the parameters. 5245 FTI.freeArgs(); 5246 D.setInvalidType(); 5247 } 5248 5249 // Make sure the destructor isn't variadic. 5250 if (FTI.isVariadic) { 5251 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5252 D.setInvalidType(); 5253 } 5254 5255 // Rebuild the function type "R" without any type qualifiers or 5256 // parameters (in case any of the errors above fired) and with 5257 // "void" as the return type, since destructors don't have return 5258 // types. 5259 if (!D.isInvalidType()) 5260 return R; 5261 5262 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5263 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5264 EPI.Variadic = false; 5265 EPI.TypeQuals = 0; 5266 EPI.RefQualifier = RQ_None; 5267 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5268} 5269 5270/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5271/// well-formednes of the conversion function declarator @p D with 5272/// type @p R. If there are any errors in the declarator, this routine 5273/// will emit diagnostics and return true. Otherwise, it will return 5274/// false. Either way, the type @p R will be updated to reflect a 5275/// well-formed type for the conversion operator. 5276void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5277 StorageClass& SC) { 5278 // C++ [class.conv.fct]p1: 5279 // Neither parameter types nor return type can be specified. The 5280 // type of a conversion function (8.3.5) is "function taking no 5281 // parameter returning conversion-type-id." 5282 if (SC == SC_Static) { 5283 if (!D.isInvalidType()) 5284 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5285 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5286 << SourceRange(D.getIdentifierLoc()); 5287 D.setInvalidType(); 5288 SC = SC_None; 5289 } 5290 5291 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5292 5293 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5294 // Conversion functions don't have return types, but the parser will 5295 // happily parse something like: 5296 // 5297 // class X { 5298 // float operator bool(); 5299 // }; 5300 // 5301 // The return type will be changed later anyway. 5302 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5303 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5304 << SourceRange(D.getIdentifierLoc()); 5305 D.setInvalidType(); 5306 } 5307 5308 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5309 5310 // Make sure we don't have any parameters. 5311 if (Proto->getNumArgs() > 0) { 5312 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5313 5314 // Delete the parameters. 5315 D.getFunctionTypeInfo().freeArgs(); 5316 D.setInvalidType(); 5317 } else if (Proto->isVariadic()) { 5318 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5319 D.setInvalidType(); 5320 } 5321 5322 // Diagnose "&operator bool()" and other such nonsense. This 5323 // is actually a gcc extension which we don't support. 5324 if (Proto->getResultType() != ConvType) { 5325 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5326 << Proto->getResultType(); 5327 D.setInvalidType(); 5328 ConvType = Proto->getResultType(); 5329 } 5330 5331 // C++ [class.conv.fct]p4: 5332 // The conversion-type-id shall not represent a function type nor 5333 // an array type. 5334 if (ConvType->isArrayType()) { 5335 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5336 ConvType = Context.getPointerType(ConvType); 5337 D.setInvalidType(); 5338 } else if (ConvType->isFunctionType()) { 5339 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5340 ConvType = Context.getPointerType(ConvType); 5341 D.setInvalidType(); 5342 } 5343 5344 // Rebuild the function type "R" without any parameters (in case any 5345 // of the errors above fired) and with the conversion type as the 5346 // return type. 5347 if (D.isInvalidType()) 5348 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5349 5350 // C++0x explicit conversion operators. 5351 if (D.getDeclSpec().isExplicitSpecified()) 5352 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5353 getLangOpts().CPlusPlus0x ? 5354 diag::warn_cxx98_compat_explicit_conversion_functions : 5355 diag::ext_explicit_conversion_functions) 5356 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5357} 5358 5359/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5360/// the declaration of the given C++ conversion function. This routine 5361/// is responsible for recording the conversion function in the C++ 5362/// class, if possible. 5363Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5364 assert(Conversion && "Expected to receive a conversion function declaration"); 5365 5366 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5367 5368 // Make sure we aren't redeclaring the conversion function. 5369 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5370 5371 // C++ [class.conv.fct]p1: 5372 // [...] A conversion function is never used to convert a 5373 // (possibly cv-qualified) object to the (possibly cv-qualified) 5374 // same object type (or a reference to it), to a (possibly 5375 // cv-qualified) base class of that type (or a reference to it), 5376 // or to (possibly cv-qualified) void. 5377 // FIXME: Suppress this warning if the conversion function ends up being a 5378 // virtual function that overrides a virtual function in a base class. 5379 QualType ClassType 5380 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5381 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5382 ConvType = ConvTypeRef->getPointeeType(); 5383 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5384 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5385 /* Suppress diagnostics for instantiations. */; 5386 else if (ConvType->isRecordType()) { 5387 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5388 if (ConvType == ClassType) 5389 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5390 << ClassType; 5391 else if (IsDerivedFrom(ClassType, ConvType)) 5392 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5393 << ClassType << ConvType; 5394 } else if (ConvType->isVoidType()) { 5395 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5396 << ClassType << ConvType; 5397 } 5398 5399 if (FunctionTemplateDecl *ConversionTemplate 5400 = Conversion->getDescribedFunctionTemplate()) 5401 return ConversionTemplate; 5402 5403 return Conversion; 5404} 5405 5406//===----------------------------------------------------------------------===// 5407// Namespace Handling 5408//===----------------------------------------------------------------------===// 5409 5410 5411 5412/// ActOnStartNamespaceDef - This is called at the start of a namespace 5413/// definition. 5414Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5415 SourceLocation InlineLoc, 5416 SourceLocation NamespaceLoc, 5417 SourceLocation IdentLoc, 5418 IdentifierInfo *II, 5419 SourceLocation LBrace, 5420 AttributeList *AttrList) { 5421 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5422 // For anonymous namespace, take the location of the left brace. 5423 SourceLocation Loc = II ? IdentLoc : LBrace; 5424 bool IsInline = InlineLoc.isValid(); 5425 bool IsInvalid = false; 5426 bool IsStd = false; 5427 bool AddToKnown = false; 5428 Scope *DeclRegionScope = NamespcScope->getParent(); 5429 5430 NamespaceDecl *PrevNS = 0; 5431 if (II) { 5432 // C++ [namespace.def]p2: 5433 // The identifier in an original-namespace-definition shall not 5434 // have been previously defined in the declarative region in 5435 // which the original-namespace-definition appears. The 5436 // identifier in an original-namespace-definition is the name of 5437 // the namespace. Subsequently in that declarative region, it is 5438 // treated as an original-namespace-name. 5439 // 5440 // Since namespace names are unique in their scope, and we don't 5441 // look through using directives, just look for any ordinary names. 5442 5443 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5444 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5445 Decl::IDNS_Namespace; 5446 NamedDecl *PrevDecl = 0; 5447 for (DeclContext::lookup_result R 5448 = CurContext->getRedeclContext()->lookup(II); 5449 R.first != R.second; ++R.first) { 5450 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5451 PrevDecl = *R.first; 5452 break; 5453 } 5454 } 5455 5456 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5457 5458 if (PrevNS) { 5459 // This is an extended namespace definition. 5460 if (IsInline != PrevNS->isInline()) { 5461 // inline-ness must match 5462 if (PrevNS->isInline()) { 5463 // The user probably just forgot the 'inline', so suggest that it 5464 // be added back. 5465 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5466 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5467 } else { 5468 Diag(Loc, diag::err_inline_namespace_mismatch) 5469 << IsInline; 5470 } 5471 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5472 5473 IsInline = PrevNS->isInline(); 5474 } 5475 } else if (PrevDecl) { 5476 // This is an invalid name redefinition. 5477 Diag(Loc, diag::err_redefinition_different_kind) 5478 << II; 5479 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5480 IsInvalid = true; 5481 // Continue on to push Namespc as current DeclContext and return it. 5482 } else if (II->isStr("std") && 5483 CurContext->getRedeclContext()->isTranslationUnit()) { 5484 // This is the first "real" definition of the namespace "std", so update 5485 // our cache of the "std" namespace to point at this definition. 5486 PrevNS = getStdNamespace(); 5487 IsStd = true; 5488 AddToKnown = !IsInline; 5489 } else { 5490 // We've seen this namespace for the first time. 5491 AddToKnown = !IsInline; 5492 } 5493 } else { 5494 // Anonymous namespaces. 5495 5496 // Determine whether the parent already has an anonymous namespace. 5497 DeclContext *Parent = CurContext->getRedeclContext(); 5498 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5499 PrevNS = TU->getAnonymousNamespace(); 5500 } else { 5501 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5502 PrevNS = ND->getAnonymousNamespace(); 5503 } 5504 5505 if (PrevNS && IsInline != PrevNS->isInline()) { 5506 // inline-ness must match 5507 Diag(Loc, diag::err_inline_namespace_mismatch) 5508 << IsInline; 5509 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5510 5511 // Recover by ignoring the new namespace's inline status. 5512 IsInline = PrevNS->isInline(); 5513 } 5514 } 5515 5516 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5517 StartLoc, Loc, II, PrevNS); 5518 if (IsInvalid) 5519 Namespc->setInvalidDecl(); 5520 5521 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5522 5523 // FIXME: Should we be merging attributes? 5524 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5525 PushNamespaceVisibilityAttr(Attr, Loc); 5526 5527 if (IsStd) 5528 StdNamespace = Namespc; 5529 if (AddToKnown) 5530 KnownNamespaces[Namespc] = false; 5531 5532 if (II) { 5533 PushOnScopeChains(Namespc, DeclRegionScope); 5534 } else { 5535 // Link the anonymous namespace into its parent. 5536 DeclContext *Parent = CurContext->getRedeclContext(); 5537 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5538 TU->setAnonymousNamespace(Namespc); 5539 } else { 5540 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5541 } 5542 5543 CurContext->addDecl(Namespc); 5544 5545 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5546 // behaves as if it were replaced by 5547 // namespace unique { /* empty body */ } 5548 // using namespace unique; 5549 // namespace unique { namespace-body } 5550 // where all occurrences of 'unique' in a translation unit are 5551 // replaced by the same identifier and this identifier differs 5552 // from all other identifiers in the entire program. 5553 5554 // We just create the namespace with an empty name and then add an 5555 // implicit using declaration, just like the standard suggests. 5556 // 5557 // CodeGen enforces the "universally unique" aspect by giving all 5558 // declarations semantically contained within an anonymous 5559 // namespace internal linkage. 5560 5561 if (!PrevNS) { 5562 UsingDirectiveDecl* UD 5563 = UsingDirectiveDecl::Create(Context, CurContext, 5564 /* 'using' */ LBrace, 5565 /* 'namespace' */ SourceLocation(), 5566 /* qualifier */ NestedNameSpecifierLoc(), 5567 /* identifier */ SourceLocation(), 5568 Namespc, 5569 /* Ancestor */ CurContext); 5570 UD->setImplicit(); 5571 CurContext->addDecl(UD); 5572 } 5573 } 5574 5575 // Although we could have an invalid decl (i.e. the namespace name is a 5576 // redefinition), push it as current DeclContext and try to continue parsing. 5577 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5578 // for the namespace has the declarations that showed up in that particular 5579 // namespace definition. 5580 PushDeclContext(NamespcScope, Namespc); 5581 return Namespc; 5582} 5583 5584/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5585/// is a namespace alias, returns the namespace it points to. 5586static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5587 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5588 return AD->getNamespace(); 5589 return dyn_cast_or_null<NamespaceDecl>(D); 5590} 5591 5592/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5593/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5594void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5595 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5596 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5597 Namespc->setRBraceLoc(RBrace); 5598 PopDeclContext(); 5599 if (Namespc->hasAttr<VisibilityAttr>()) 5600 PopPragmaVisibility(true, RBrace); 5601} 5602 5603CXXRecordDecl *Sema::getStdBadAlloc() const { 5604 return cast_or_null<CXXRecordDecl>( 5605 StdBadAlloc.get(Context.getExternalSource())); 5606} 5607 5608NamespaceDecl *Sema::getStdNamespace() const { 5609 return cast_or_null<NamespaceDecl>( 5610 StdNamespace.get(Context.getExternalSource())); 5611} 5612 5613/// \brief Retrieve the special "std" namespace, which may require us to 5614/// implicitly define the namespace. 5615NamespaceDecl *Sema::getOrCreateStdNamespace() { 5616 if (!StdNamespace) { 5617 // The "std" namespace has not yet been defined, so build one implicitly. 5618 StdNamespace = NamespaceDecl::Create(Context, 5619 Context.getTranslationUnitDecl(), 5620 /*Inline=*/false, 5621 SourceLocation(), SourceLocation(), 5622 &PP.getIdentifierTable().get("std"), 5623 /*PrevDecl=*/0); 5624 getStdNamespace()->setImplicit(true); 5625 } 5626 5627 return getStdNamespace(); 5628} 5629 5630bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5631 assert(getLangOpts().CPlusPlus && 5632 "Looking for std::initializer_list outside of C++."); 5633 5634 // We're looking for implicit instantiations of 5635 // template <typename E> class std::initializer_list. 5636 5637 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5638 return false; 5639 5640 ClassTemplateDecl *Template = 0; 5641 const TemplateArgument *Arguments = 0; 5642 5643 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5644 5645 ClassTemplateSpecializationDecl *Specialization = 5646 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5647 if (!Specialization) 5648 return false; 5649 5650 Template = Specialization->getSpecializedTemplate(); 5651 Arguments = Specialization->getTemplateArgs().data(); 5652 } else if (const TemplateSpecializationType *TST = 5653 Ty->getAs<TemplateSpecializationType>()) { 5654 Template = dyn_cast_or_null<ClassTemplateDecl>( 5655 TST->getTemplateName().getAsTemplateDecl()); 5656 Arguments = TST->getArgs(); 5657 } 5658 if (!Template) 5659 return false; 5660 5661 if (!StdInitializerList) { 5662 // Haven't recognized std::initializer_list yet, maybe this is it. 5663 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5664 if (TemplateClass->getIdentifier() != 5665 &PP.getIdentifierTable().get("initializer_list") || 5666 !getStdNamespace()->InEnclosingNamespaceSetOf( 5667 TemplateClass->getDeclContext())) 5668 return false; 5669 // This is a template called std::initializer_list, but is it the right 5670 // template? 5671 TemplateParameterList *Params = Template->getTemplateParameters(); 5672 if (Params->getMinRequiredArguments() != 1) 5673 return false; 5674 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5675 return false; 5676 5677 // It's the right template. 5678 StdInitializerList = Template; 5679 } 5680 5681 if (Template != StdInitializerList) 5682 return false; 5683 5684 // This is an instance of std::initializer_list. Find the argument type. 5685 if (Element) 5686 *Element = Arguments[0].getAsType(); 5687 return true; 5688} 5689 5690static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5691 NamespaceDecl *Std = S.getStdNamespace(); 5692 if (!Std) { 5693 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5694 return 0; 5695 } 5696 5697 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5698 Loc, Sema::LookupOrdinaryName); 5699 if (!S.LookupQualifiedName(Result, Std)) { 5700 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5701 return 0; 5702 } 5703 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5704 if (!Template) { 5705 Result.suppressDiagnostics(); 5706 // We found something weird. Complain about the first thing we found. 5707 NamedDecl *Found = *Result.begin(); 5708 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5709 return 0; 5710 } 5711 5712 // We found some template called std::initializer_list. Now verify that it's 5713 // correct. 5714 TemplateParameterList *Params = Template->getTemplateParameters(); 5715 if (Params->getMinRequiredArguments() != 1 || 5716 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5717 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5718 return 0; 5719 } 5720 5721 return Template; 5722} 5723 5724QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5725 if (!StdInitializerList) { 5726 StdInitializerList = LookupStdInitializerList(*this, Loc); 5727 if (!StdInitializerList) 5728 return QualType(); 5729 } 5730 5731 TemplateArgumentListInfo Args(Loc, Loc); 5732 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5733 Context.getTrivialTypeSourceInfo(Element, 5734 Loc))); 5735 return Context.getCanonicalType( 5736 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5737} 5738 5739bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5740 // C++ [dcl.init.list]p2: 5741 // A constructor is an initializer-list constructor if its first parameter 5742 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5743 // std::initializer_list<E> for some type E, and either there are no other 5744 // parameters or else all other parameters have default arguments. 5745 if (Ctor->getNumParams() < 1 || 5746 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5747 return false; 5748 5749 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5750 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5751 ArgType = RT->getPointeeType().getUnqualifiedType(); 5752 5753 return isStdInitializerList(ArgType, 0); 5754} 5755 5756/// \brief Determine whether a using statement is in a context where it will be 5757/// apply in all contexts. 5758static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5759 switch (CurContext->getDeclKind()) { 5760 case Decl::TranslationUnit: 5761 return true; 5762 case Decl::LinkageSpec: 5763 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5764 default: 5765 return false; 5766 } 5767} 5768 5769namespace { 5770 5771// Callback to only accept typo corrections that are namespaces. 5772class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5773 public: 5774 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5775 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5776 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5777 } 5778 return false; 5779 } 5780}; 5781 5782} 5783 5784static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5785 CXXScopeSpec &SS, 5786 SourceLocation IdentLoc, 5787 IdentifierInfo *Ident) { 5788 NamespaceValidatorCCC Validator; 5789 R.clear(); 5790 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5791 R.getLookupKind(), Sc, &SS, 5792 Validator)) { 5793 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5794 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5795 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5796 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5797 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5798 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5799 else 5800 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5801 << Ident << CorrectedQuotedStr 5802 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5803 5804 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5805 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5806 5807 R.addDecl(Corrected.getCorrectionDecl()); 5808 return true; 5809 } 5810 return false; 5811} 5812 5813Decl *Sema::ActOnUsingDirective(Scope *S, 5814 SourceLocation UsingLoc, 5815 SourceLocation NamespcLoc, 5816 CXXScopeSpec &SS, 5817 SourceLocation IdentLoc, 5818 IdentifierInfo *NamespcName, 5819 AttributeList *AttrList) { 5820 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5821 assert(NamespcName && "Invalid NamespcName."); 5822 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5823 5824 // This can only happen along a recovery path. 5825 while (S->getFlags() & Scope::TemplateParamScope) 5826 S = S->getParent(); 5827 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5828 5829 UsingDirectiveDecl *UDir = 0; 5830 NestedNameSpecifier *Qualifier = 0; 5831 if (SS.isSet()) 5832 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5833 5834 // Lookup namespace name. 5835 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5836 LookupParsedName(R, S, &SS); 5837 if (R.isAmbiguous()) 5838 return 0; 5839 5840 if (R.empty()) { 5841 R.clear(); 5842 // Allow "using namespace std;" or "using namespace ::std;" even if 5843 // "std" hasn't been defined yet, for GCC compatibility. 5844 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5845 NamespcName->isStr("std")) { 5846 Diag(IdentLoc, diag::ext_using_undefined_std); 5847 R.addDecl(getOrCreateStdNamespace()); 5848 R.resolveKind(); 5849 } 5850 // Otherwise, attempt typo correction. 5851 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5852 } 5853 5854 if (!R.empty()) { 5855 NamedDecl *Named = R.getFoundDecl(); 5856 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5857 && "expected namespace decl"); 5858 // C++ [namespace.udir]p1: 5859 // A using-directive specifies that the names in the nominated 5860 // namespace can be used in the scope in which the 5861 // using-directive appears after the using-directive. During 5862 // unqualified name lookup (3.4.1), the names appear as if they 5863 // were declared in the nearest enclosing namespace which 5864 // contains both the using-directive and the nominated 5865 // namespace. [Note: in this context, "contains" means "contains 5866 // directly or indirectly". ] 5867 5868 // Find enclosing context containing both using-directive and 5869 // nominated namespace. 5870 NamespaceDecl *NS = getNamespaceDecl(Named); 5871 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5872 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5873 CommonAncestor = CommonAncestor->getParent(); 5874 5875 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5876 SS.getWithLocInContext(Context), 5877 IdentLoc, Named, CommonAncestor); 5878 5879 if (IsUsingDirectiveInToplevelContext(CurContext) && 5880 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5881 Diag(IdentLoc, diag::warn_using_directive_in_header); 5882 } 5883 5884 PushUsingDirective(S, UDir); 5885 } else { 5886 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5887 } 5888 5889 // FIXME: We ignore attributes for now. 5890 return UDir; 5891} 5892 5893void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5894 // If the scope has an associated entity and the using directive is at 5895 // namespace or translation unit scope, add the UsingDirectiveDecl into 5896 // its lookup structure so qualified name lookup can find it. 5897 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5898 if (Ctx && !Ctx->isFunctionOrMethod()) 5899 Ctx->addDecl(UDir); 5900 else 5901 // Otherwise, it is at block sope. The using-directives will affect lookup 5902 // only to the end of the scope. 5903 S->PushUsingDirective(UDir); 5904} 5905 5906 5907Decl *Sema::ActOnUsingDeclaration(Scope *S, 5908 AccessSpecifier AS, 5909 bool HasUsingKeyword, 5910 SourceLocation UsingLoc, 5911 CXXScopeSpec &SS, 5912 UnqualifiedId &Name, 5913 AttributeList *AttrList, 5914 bool IsTypeName, 5915 SourceLocation TypenameLoc) { 5916 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5917 5918 switch (Name.getKind()) { 5919 case UnqualifiedId::IK_ImplicitSelfParam: 5920 case UnqualifiedId::IK_Identifier: 5921 case UnqualifiedId::IK_OperatorFunctionId: 5922 case UnqualifiedId::IK_LiteralOperatorId: 5923 case UnqualifiedId::IK_ConversionFunctionId: 5924 break; 5925 5926 case UnqualifiedId::IK_ConstructorName: 5927 case UnqualifiedId::IK_ConstructorTemplateId: 5928 // C++11 inheriting constructors. 5929 Diag(Name.getLocStart(), 5930 getLangOpts().CPlusPlus0x ? 5931 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 5932 // instead once inheriting constructors work. 5933 diag::err_using_decl_constructor_unsupported : 5934 diag::err_using_decl_constructor) 5935 << SS.getRange(); 5936 5937 if (getLangOpts().CPlusPlus0x) break; 5938 5939 return 0; 5940 5941 case UnqualifiedId::IK_DestructorName: 5942 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5943 << SS.getRange(); 5944 return 0; 5945 5946 case UnqualifiedId::IK_TemplateId: 5947 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5948 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5949 return 0; 5950 } 5951 5952 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5953 DeclarationName TargetName = TargetNameInfo.getName(); 5954 if (!TargetName) 5955 return 0; 5956 5957 // Warn about using declarations. 5958 // TODO: store that the declaration was written without 'using' and 5959 // talk about access decls instead of using decls in the 5960 // diagnostics. 5961 if (!HasUsingKeyword) { 5962 UsingLoc = Name.getLocStart(); 5963 5964 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5965 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5966 } 5967 5968 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5969 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5970 return 0; 5971 5972 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5973 TargetNameInfo, AttrList, 5974 /* IsInstantiation */ false, 5975 IsTypeName, TypenameLoc); 5976 if (UD) 5977 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5978 5979 return UD; 5980} 5981 5982/// \brief Determine whether a using declaration considers the given 5983/// declarations as "equivalent", e.g., if they are redeclarations of 5984/// the same entity or are both typedefs of the same type. 5985static bool 5986IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5987 bool &SuppressRedeclaration) { 5988 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5989 SuppressRedeclaration = false; 5990 return true; 5991 } 5992 5993 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5994 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5995 SuppressRedeclaration = true; 5996 return Context.hasSameType(TD1->getUnderlyingType(), 5997 TD2->getUnderlyingType()); 5998 } 5999 6000 return false; 6001} 6002 6003 6004/// Determines whether to create a using shadow decl for a particular 6005/// decl, given the set of decls existing prior to this using lookup. 6006bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6007 const LookupResult &Previous) { 6008 // Diagnose finding a decl which is not from a base class of the 6009 // current class. We do this now because there are cases where this 6010 // function will silently decide not to build a shadow decl, which 6011 // will pre-empt further diagnostics. 6012 // 6013 // We don't need to do this in C++0x because we do the check once on 6014 // the qualifier. 6015 // 6016 // FIXME: diagnose the following if we care enough: 6017 // struct A { int foo; }; 6018 // struct B : A { using A::foo; }; 6019 // template <class T> struct C : A {}; 6020 // template <class T> struct D : C<T> { using B::foo; } // <--- 6021 // This is invalid (during instantiation) in C++03 because B::foo 6022 // resolves to the using decl in B, which is not a base class of D<T>. 6023 // We can't diagnose it immediately because C<T> is an unknown 6024 // specialization. The UsingShadowDecl in D<T> then points directly 6025 // to A::foo, which will look well-formed when we instantiate. 6026 // The right solution is to not collapse the shadow-decl chain. 6027 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 6028 DeclContext *OrigDC = Orig->getDeclContext(); 6029 6030 // Handle enums and anonymous structs. 6031 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6032 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6033 while (OrigRec->isAnonymousStructOrUnion()) 6034 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6035 6036 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6037 if (OrigDC == CurContext) { 6038 Diag(Using->getLocation(), 6039 diag::err_using_decl_nested_name_specifier_is_current_class) 6040 << Using->getQualifierLoc().getSourceRange(); 6041 Diag(Orig->getLocation(), diag::note_using_decl_target); 6042 return true; 6043 } 6044 6045 Diag(Using->getQualifierLoc().getBeginLoc(), 6046 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6047 << Using->getQualifier() 6048 << cast<CXXRecordDecl>(CurContext) 6049 << Using->getQualifierLoc().getSourceRange(); 6050 Diag(Orig->getLocation(), diag::note_using_decl_target); 6051 return true; 6052 } 6053 } 6054 6055 if (Previous.empty()) return false; 6056 6057 NamedDecl *Target = Orig; 6058 if (isa<UsingShadowDecl>(Target)) 6059 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6060 6061 // If the target happens to be one of the previous declarations, we 6062 // don't have a conflict. 6063 // 6064 // FIXME: but we might be increasing its access, in which case we 6065 // should redeclare it. 6066 NamedDecl *NonTag = 0, *Tag = 0; 6067 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6068 I != E; ++I) { 6069 NamedDecl *D = (*I)->getUnderlyingDecl(); 6070 bool Result; 6071 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6072 return Result; 6073 6074 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6075 } 6076 6077 if (Target->isFunctionOrFunctionTemplate()) { 6078 FunctionDecl *FD; 6079 if (isa<FunctionTemplateDecl>(Target)) 6080 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6081 else 6082 FD = cast<FunctionDecl>(Target); 6083 6084 NamedDecl *OldDecl = 0; 6085 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6086 case Ovl_Overload: 6087 return false; 6088 6089 case Ovl_NonFunction: 6090 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6091 break; 6092 6093 // We found a decl with the exact signature. 6094 case Ovl_Match: 6095 // If we're in a record, we want to hide the target, so we 6096 // return true (without a diagnostic) to tell the caller not to 6097 // build a shadow decl. 6098 if (CurContext->isRecord()) 6099 return true; 6100 6101 // If we're not in a record, this is an error. 6102 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6103 break; 6104 } 6105 6106 Diag(Target->getLocation(), diag::note_using_decl_target); 6107 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6108 return true; 6109 } 6110 6111 // Target is not a function. 6112 6113 if (isa<TagDecl>(Target)) { 6114 // No conflict between a tag and a non-tag. 6115 if (!Tag) return false; 6116 6117 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6118 Diag(Target->getLocation(), diag::note_using_decl_target); 6119 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6120 return true; 6121 } 6122 6123 // No conflict between a tag and a non-tag. 6124 if (!NonTag) return false; 6125 6126 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6127 Diag(Target->getLocation(), diag::note_using_decl_target); 6128 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6129 return true; 6130} 6131 6132/// Builds a shadow declaration corresponding to a 'using' declaration. 6133UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6134 UsingDecl *UD, 6135 NamedDecl *Orig) { 6136 6137 // If we resolved to another shadow declaration, just coalesce them. 6138 NamedDecl *Target = Orig; 6139 if (isa<UsingShadowDecl>(Target)) { 6140 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6141 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6142 } 6143 6144 UsingShadowDecl *Shadow 6145 = UsingShadowDecl::Create(Context, CurContext, 6146 UD->getLocation(), UD, Target); 6147 UD->addShadowDecl(Shadow); 6148 6149 Shadow->setAccess(UD->getAccess()); 6150 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6151 Shadow->setInvalidDecl(); 6152 6153 if (S) 6154 PushOnScopeChains(Shadow, S); 6155 else 6156 CurContext->addDecl(Shadow); 6157 6158 6159 return Shadow; 6160} 6161 6162/// Hides a using shadow declaration. This is required by the current 6163/// using-decl implementation when a resolvable using declaration in a 6164/// class is followed by a declaration which would hide or override 6165/// one or more of the using decl's targets; for example: 6166/// 6167/// struct Base { void foo(int); }; 6168/// struct Derived : Base { 6169/// using Base::foo; 6170/// void foo(int); 6171/// }; 6172/// 6173/// The governing language is C++03 [namespace.udecl]p12: 6174/// 6175/// When a using-declaration brings names from a base class into a 6176/// derived class scope, member functions in the derived class 6177/// override and/or hide member functions with the same name and 6178/// parameter types in a base class (rather than conflicting). 6179/// 6180/// There are two ways to implement this: 6181/// (1) optimistically create shadow decls when they're not hidden 6182/// by existing declarations, or 6183/// (2) don't create any shadow decls (or at least don't make them 6184/// visible) until we've fully parsed/instantiated the class. 6185/// The problem with (1) is that we might have to retroactively remove 6186/// a shadow decl, which requires several O(n) operations because the 6187/// decl structures are (very reasonably) not designed for removal. 6188/// (2) avoids this but is very fiddly and phase-dependent. 6189void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6190 if (Shadow->getDeclName().getNameKind() == 6191 DeclarationName::CXXConversionFunctionName) 6192 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6193 6194 // Remove it from the DeclContext... 6195 Shadow->getDeclContext()->removeDecl(Shadow); 6196 6197 // ...and the scope, if applicable... 6198 if (S) { 6199 S->RemoveDecl(Shadow); 6200 IdResolver.RemoveDecl(Shadow); 6201 } 6202 6203 // ...and the using decl. 6204 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6205 6206 // TODO: complain somehow if Shadow was used. It shouldn't 6207 // be possible for this to happen, because...? 6208} 6209 6210/// Builds a using declaration. 6211/// 6212/// \param IsInstantiation - Whether this call arises from an 6213/// instantiation of an unresolved using declaration. We treat 6214/// the lookup differently for these declarations. 6215NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6216 SourceLocation UsingLoc, 6217 CXXScopeSpec &SS, 6218 const DeclarationNameInfo &NameInfo, 6219 AttributeList *AttrList, 6220 bool IsInstantiation, 6221 bool IsTypeName, 6222 SourceLocation TypenameLoc) { 6223 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6224 SourceLocation IdentLoc = NameInfo.getLoc(); 6225 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6226 6227 // FIXME: We ignore attributes for now. 6228 6229 if (SS.isEmpty()) { 6230 Diag(IdentLoc, diag::err_using_requires_qualname); 6231 return 0; 6232 } 6233 6234 // Do the redeclaration lookup in the current scope. 6235 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6236 ForRedeclaration); 6237 Previous.setHideTags(false); 6238 if (S) { 6239 LookupName(Previous, S); 6240 6241 // It is really dumb that we have to do this. 6242 LookupResult::Filter F = Previous.makeFilter(); 6243 while (F.hasNext()) { 6244 NamedDecl *D = F.next(); 6245 if (!isDeclInScope(D, CurContext, S)) 6246 F.erase(); 6247 } 6248 F.done(); 6249 } else { 6250 assert(IsInstantiation && "no scope in non-instantiation"); 6251 assert(CurContext->isRecord() && "scope not record in instantiation"); 6252 LookupQualifiedName(Previous, CurContext); 6253 } 6254 6255 // Check for invalid redeclarations. 6256 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6257 return 0; 6258 6259 // Check for bad qualifiers. 6260 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6261 return 0; 6262 6263 DeclContext *LookupContext = computeDeclContext(SS); 6264 NamedDecl *D; 6265 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6266 if (!LookupContext) { 6267 if (IsTypeName) { 6268 // FIXME: not all declaration name kinds are legal here 6269 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6270 UsingLoc, TypenameLoc, 6271 QualifierLoc, 6272 IdentLoc, NameInfo.getName()); 6273 } else { 6274 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6275 QualifierLoc, NameInfo); 6276 } 6277 } else { 6278 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6279 NameInfo, IsTypeName); 6280 } 6281 D->setAccess(AS); 6282 CurContext->addDecl(D); 6283 6284 if (!LookupContext) return D; 6285 UsingDecl *UD = cast<UsingDecl>(D); 6286 6287 if (RequireCompleteDeclContext(SS, LookupContext)) { 6288 UD->setInvalidDecl(); 6289 return UD; 6290 } 6291 6292 // The normal rules do not apply to inheriting constructor declarations. 6293 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6294 if (CheckInheritingConstructorUsingDecl(UD)) 6295 UD->setInvalidDecl(); 6296 return UD; 6297 } 6298 6299 // Otherwise, look up the target name. 6300 6301 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6302 6303 // Unlike most lookups, we don't always want to hide tag 6304 // declarations: tag names are visible through the using declaration 6305 // even if hidden by ordinary names, *except* in a dependent context 6306 // where it's important for the sanity of two-phase lookup. 6307 if (!IsInstantiation) 6308 R.setHideTags(false); 6309 6310 // For the purposes of this lookup, we have a base object type 6311 // equal to that of the current context. 6312 if (CurContext->isRecord()) { 6313 R.setBaseObjectType( 6314 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6315 } 6316 6317 LookupQualifiedName(R, LookupContext); 6318 6319 if (R.empty()) { 6320 Diag(IdentLoc, diag::err_no_member) 6321 << NameInfo.getName() << LookupContext << SS.getRange(); 6322 UD->setInvalidDecl(); 6323 return UD; 6324 } 6325 6326 if (R.isAmbiguous()) { 6327 UD->setInvalidDecl(); 6328 return UD; 6329 } 6330 6331 if (IsTypeName) { 6332 // If we asked for a typename and got a non-type decl, error out. 6333 if (!R.getAsSingle<TypeDecl>()) { 6334 Diag(IdentLoc, diag::err_using_typename_non_type); 6335 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6336 Diag((*I)->getUnderlyingDecl()->getLocation(), 6337 diag::note_using_decl_target); 6338 UD->setInvalidDecl(); 6339 return UD; 6340 } 6341 } else { 6342 // If we asked for a non-typename and we got a type, error out, 6343 // but only if this is an instantiation of an unresolved using 6344 // decl. Otherwise just silently find the type name. 6345 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6346 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6347 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6348 UD->setInvalidDecl(); 6349 return UD; 6350 } 6351 } 6352 6353 // C++0x N2914 [namespace.udecl]p6: 6354 // A using-declaration shall not name a namespace. 6355 if (R.getAsSingle<NamespaceDecl>()) { 6356 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6357 << SS.getRange(); 6358 UD->setInvalidDecl(); 6359 return UD; 6360 } 6361 6362 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6363 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6364 BuildUsingShadowDecl(S, UD, *I); 6365 } 6366 6367 return UD; 6368} 6369 6370/// Additional checks for a using declaration referring to a constructor name. 6371bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6372 assert(!UD->isTypeName() && "expecting a constructor name"); 6373 6374 const Type *SourceType = UD->getQualifier()->getAsType(); 6375 assert(SourceType && 6376 "Using decl naming constructor doesn't have type in scope spec."); 6377 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6378 6379 // Check whether the named type is a direct base class. 6380 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6381 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6382 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6383 BaseIt != BaseE; ++BaseIt) { 6384 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6385 if (CanonicalSourceType == BaseType) 6386 break; 6387 if (BaseIt->getType()->isDependentType()) 6388 break; 6389 } 6390 6391 if (BaseIt == BaseE) { 6392 // Did not find SourceType in the bases. 6393 Diag(UD->getUsingLocation(), 6394 diag::err_using_decl_constructor_not_in_direct_base) 6395 << UD->getNameInfo().getSourceRange() 6396 << QualType(SourceType, 0) << TargetClass; 6397 return true; 6398 } 6399 6400 if (!CurContext->isDependentContext()) 6401 BaseIt->setInheritConstructors(); 6402 6403 return false; 6404} 6405 6406/// Checks that the given using declaration is not an invalid 6407/// redeclaration. Note that this is checking only for the using decl 6408/// itself, not for any ill-formedness among the UsingShadowDecls. 6409bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6410 bool isTypeName, 6411 const CXXScopeSpec &SS, 6412 SourceLocation NameLoc, 6413 const LookupResult &Prev) { 6414 // C++03 [namespace.udecl]p8: 6415 // C++0x [namespace.udecl]p10: 6416 // A using-declaration is a declaration and can therefore be used 6417 // repeatedly where (and only where) multiple declarations are 6418 // allowed. 6419 // 6420 // That's in non-member contexts. 6421 if (!CurContext->getRedeclContext()->isRecord()) 6422 return false; 6423 6424 NestedNameSpecifier *Qual 6425 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6426 6427 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6428 NamedDecl *D = *I; 6429 6430 bool DTypename; 6431 NestedNameSpecifier *DQual; 6432 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6433 DTypename = UD->isTypeName(); 6434 DQual = UD->getQualifier(); 6435 } else if (UnresolvedUsingValueDecl *UD 6436 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6437 DTypename = false; 6438 DQual = UD->getQualifier(); 6439 } else if (UnresolvedUsingTypenameDecl *UD 6440 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6441 DTypename = true; 6442 DQual = UD->getQualifier(); 6443 } else continue; 6444 6445 // using decls differ if one says 'typename' and the other doesn't. 6446 // FIXME: non-dependent using decls? 6447 if (isTypeName != DTypename) continue; 6448 6449 // using decls differ if they name different scopes (but note that 6450 // template instantiation can cause this check to trigger when it 6451 // didn't before instantiation). 6452 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6453 Context.getCanonicalNestedNameSpecifier(DQual)) 6454 continue; 6455 6456 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6457 Diag(D->getLocation(), diag::note_using_decl) << 1; 6458 return true; 6459 } 6460 6461 return false; 6462} 6463 6464 6465/// Checks that the given nested-name qualifier used in a using decl 6466/// in the current context is appropriately related to the current 6467/// scope. If an error is found, diagnoses it and returns true. 6468bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6469 const CXXScopeSpec &SS, 6470 SourceLocation NameLoc) { 6471 DeclContext *NamedContext = computeDeclContext(SS); 6472 6473 if (!CurContext->isRecord()) { 6474 // C++03 [namespace.udecl]p3: 6475 // C++0x [namespace.udecl]p8: 6476 // A using-declaration for a class member shall be a member-declaration. 6477 6478 // If we weren't able to compute a valid scope, it must be a 6479 // dependent class scope. 6480 if (!NamedContext || NamedContext->isRecord()) { 6481 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6482 << SS.getRange(); 6483 return true; 6484 } 6485 6486 // Otherwise, everything is known to be fine. 6487 return false; 6488 } 6489 6490 // The current scope is a record. 6491 6492 // If the named context is dependent, we can't decide much. 6493 if (!NamedContext) { 6494 // FIXME: in C++0x, we can diagnose if we can prove that the 6495 // nested-name-specifier does not refer to a base class, which is 6496 // still possible in some cases. 6497 6498 // Otherwise we have to conservatively report that things might be 6499 // okay. 6500 return false; 6501 } 6502 6503 if (!NamedContext->isRecord()) { 6504 // Ideally this would point at the last name in the specifier, 6505 // but we don't have that level of source info. 6506 Diag(SS.getRange().getBegin(), 6507 diag::err_using_decl_nested_name_specifier_is_not_class) 6508 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6509 return true; 6510 } 6511 6512 if (!NamedContext->isDependentContext() && 6513 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6514 return true; 6515 6516 if (getLangOpts().CPlusPlus0x) { 6517 // C++0x [namespace.udecl]p3: 6518 // In a using-declaration used as a member-declaration, the 6519 // nested-name-specifier shall name a base class of the class 6520 // being defined. 6521 6522 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6523 cast<CXXRecordDecl>(NamedContext))) { 6524 if (CurContext == NamedContext) { 6525 Diag(NameLoc, 6526 diag::err_using_decl_nested_name_specifier_is_current_class) 6527 << SS.getRange(); 6528 return true; 6529 } 6530 6531 Diag(SS.getRange().getBegin(), 6532 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6533 << (NestedNameSpecifier*) SS.getScopeRep() 6534 << cast<CXXRecordDecl>(CurContext) 6535 << SS.getRange(); 6536 return true; 6537 } 6538 6539 return false; 6540 } 6541 6542 // C++03 [namespace.udecl]p4: 6543 // A using-declaration used as a member-declaration shall refer 6544 // to a member of a base class of the class being defined [etc.]. 6545 6546 // Salient point: SS doesn't have to name a base class as long as 6547 // lookup only finds members from base classes. Therefore we can 6548 // diagnose here only if we can prove that that can't happen, 6549 // i.e. if the class hierarchies provably don't intersect. 6550 6551 // TODO: it would be nice if "definitely valid" results were cached 6552 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6553 // need to be repeated. 6554 6555 struct UserData { 6556 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6557 6558 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6559 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6560 Data->Bases.insert(Base); 6561 return true; 6562 } 6563 6564 bool hasDependentBases(const CXXRecordDecl *Class) { 6565 return !Class->forallBases(collect, this); 6566 } 6567 6568 /// Returns true if the base is dependent or is one of the 6569 /// accumulated base classes. 6570 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6571 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6572 return !Data->Bases.count(Base); 6573 } 6574 6575 bool mightShareBases(const CXXRecordDecl *Class) { 6576 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6577 } 6578 }; 6579 6580 UserData Data; 6581 6582 // Returns false if we find a dependent base. 6583 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6584 return false; 6585 6586 // Returns false if the class has a dependent base or if it or one 6587 // of its bases is present in the base set of the current context. 6588 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6589 return false; 6590 6591 Diag(SS.getRange().getBegin(), 6592 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6593 << (NestedNameSpecifier*) SS.getScopeRep() 6594 << cast<CXXRecordDecl>(CurContext) 6595 << SS.getRange(); 6596 6597 return true; 6598} 6599 6600Decl *Sema::ActOnAliasDeclaration(Scope *S, 6601 AccessSpecifier AS, 6602 MultiTemplateParamsArg TemplateParamLists, 6603 SourceLocation UsingLoc, 6604 UnqualifiedId &Name, 6605 TypeResult Type) { 6606 // Skip up to the relevant declaration scope. 6607 while (S->getFlags() & Scope::TemplateParamScope) 6608 S = S->getParent(); 6609 assert((S->getFlags() & Scope::DeclScope) && 6610 "got alias-declaration outside of declaration scope"); 6611 6612 if (Type.isInvalid()) 6613 return 0; 6614 6615 bool Invalid = false; 6616 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6617 TypeSourceInfo *TInfo = 0; 6618 GetTypeFromParser(Type.get(), &TInfo); 6619 6620 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6621 return 0; 6622 6623 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6624 UPPC_DeclarationType)) { 6625 Invalid = true; 6626 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6627 TInfo->getTypeLoc().getBeginLoc()); 6628 } 6629 6630 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6631 LookupName(Previous, S); 6632 6633 // Warn about shadowing the name of a template parameter. 6634 if (Previous.isSingleResult() && 6635 Previous.getFoundDecl()->isTemplateParameter()) { 6636 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6637 Previous.clear(); 6638 } 6639 6640 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6641 "name in alias declaration must be an identifier"); 6642 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6643 Name.StartLocation, 6644 Name.Identifier, TInfo); 6645 6646 NewTD->setAccess(AS); 6647 6648 if (Invalid) 6649 NewTD->setInvalidDecl(); 6650 6651 CheckTypedefForVariablyModifiedType(S, NewTD); 6652 Invalid |= NewTD->isInvalidDecl(); 6653 6654 bool Redeclaration = false; 6655 6656 NamedDecl *NewND; 6657 if (TemplateParamLists.size()) { 6658 TypeAliasTemplateDecl *OldDecl = 0; 6659 TemplateParameterList *OldTemplateParams = 0; 6660 6661 if (TemplateParamLists.size() != 1) { 6662 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6663 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6664 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6665 } 6666 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6667 6668 // Only consider previous declarations in the same scope. 6669 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6670 /*ExplicitInstantiationOrSpecialization*/false); 6671 if (!Previous.empty()) { 6672 Redeclaration = true; 6673 6674 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6675 if (!OldDecl && !Invalid) { 6676 Diag(UsingLoc, diag::err_redefinition_different_kind) 6677 << Name.Identifier; 6678 6679 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6680 if (OldD->getLocation().isValid()) 6681 Diag(OldD->getLocation(), diag::note_previous_definition); 6682 6683 Invalid = true; 6684 } 6685 6686 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6687 if (TemplateParameterListsAreEqual(TemplateParams, 6688 OldDecl->getTemplateParameters(), 6689 /*Complain=*/true, 6690 TPL_TemplateMatch)) 6691 OldTemplateParams = OldDecl->getTemplateParameters(); 6692 else 6693 Invalid = true; 6694 6695 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6696 if (!Invalid && 6697 !Context.hasSameType(OldTD->getUnderlyingType(), 6698 NewTD->getUnderlyingType())) { 6699 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6700 // but we can't reasonably accept it. 6701 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6702 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6703 if (OldTD->getLocation().isValid()) 6704 Diag(OldTD->getLocation(), diag::note_previous_definition); 6705 Invalid = true; 6706 } 6707 } 6708 } 6709 6710 // Merge any previous default template arguments into our parameters, 6711 // and check the parameter list. 6712 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6713 TPC_TypeAliasTemplate)) 6714 return 0; 6715 6716 TypeAliasTemplateDecl *NewDecl = 6717 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6718 Name.Identifier, TemplateParams, 6719 NewTD); 6720 6721 NewDecl->setAccess(AS); 6722 6723 if (Invalid) 6724 NewDecl->setInvalidDecl(); 6725 else if (OldDecl) 6726 NewDecl->setPreviousDeclaration(OldDecl); 6727 6728 NewND = NewDecl; 6729 } else { 6730 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6731 NewND = NewTD; 6732 } 6733 6734 if (!Redeclaration) 6735 PushOnScopeChains(NewND, S); 6736 6737 return NewND; 6738} 6739 6740Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6741 SourceLocation NamespaceLoc, 6742 SourceLocation AliasLoc, 6743 IdentifierInfo *Alias, 6744 CXXScopeSpec &SS, 6745 SourceLocation IdentLoc, 6746 IdentifierInfo *Ident) { 6747 6748 // Lookup the namespace name. 6749 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6750 LookupParsedName(R, S, &SS); 6751 6752 // Check if we have a previous declaration with the same name. 6753 NamedDecl *PrevDecl 6754 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6755 ForRedeclaration); 6756 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6757 PrevDecl = 0; 6758 6759 if (PrevDecl) { 6760 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6761 // We already have an alias with the same name that points to the same 6762 // namespace, so don't create a new one. 6763 // FIXME: At some point, we'll want to create the (redundant) 6764 // declaration to maintain better source information. 6765 if (!R.isAmbiguous() && !R.empty() && 6766 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6767 return 0; 6768 } 6769 6770 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6771 diag::err_redefinition_different_kind; 6772 Diag(AliasLoc, DiagID) << Alias; 6773 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6774 return 0; 6775 } 6776 6777 if (R.isAmbiguous()) 6778 return 0; 6779 6780 if (R.empty()) { 6781 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6782 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6783 return 0; 6784 } 6785 } 6786 6787 NamespaceAliasDecl *AliasDecl = 6788 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6789 Alias, SS.getWithLocInContext(Context), 6790 IdentLoc, R.getFoundDecl()); 6791 6792 PushOnScopeChains(AliasDecl, S); 6793 return AliasDecl; 6794} 6795 6796namespace { 6797 /// \brief Scoped object used to handle the state changes required in Sema 6798 /// to implicitly define the body of a C++ member function; 6799 class ImplicitlyDefinedFunctionScope { 6800 Sema &S; 6801 Sema::ContextRAII SavedContext; 6802 6803 public: 6804 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6805 : S(S), SavedContext(S, Method) 6806 { 6807 S.PushFunctionScope(); 6808 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6809 } 6810 6811 ~ImplicitlyDefinedFunctionScope() { 6812 S.PopExpressionEvaluationContext(); 6813 S.PopFunctionScopeInfo(); 6814 } 6815 }; 6816} 6817 6818Sema::ImplicitExceptionSpecification 6819Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6820 // C++ [except.spec]p14: 6821 // An implicitly declared special member function (Clause 12) shall have an 6822 // exception-specification. [...] 6823 ImplicitExceptionSpecification ExceptSpec(*this); 6824 if (ClassDecl->isInvalidDecl()) 6825 return ExceptSpec; 6826 6827 // Direct base-class constructors. 6828 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6829 BEnd = ClassDecl->bases_end(); 6830 B != BEnd; ++B) { 6831 if (B->isVirtual()) // Handled below. 6832 continue; 6833 6834 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6835 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6836 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6837 // If this is a deleted function, add it anyway. This might be conformant 6838 // with the standard. This might not. I'm not sure. It might not matter. 6839 if (Constructor) 6840 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6841 } 6842 } 6843 6844 // Virtual base-class constructors. 6845 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6846 BEnd = ClassDecl->vbases_end(); 6847 B != BEnd; ++B) { 6848 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6849 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6850 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6851 // If this is a deleted function, add it anyway. This might be conformant 6852 // with the standard. This might not. I'm not sure. It might not matter. 6853 if (Constructor) 6854 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6855 } 6856 } 6857 6858 // Field constructors. 6859 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6860 FEnd = ClassDecl->field_end(); 6861 F != FEnd; ++F) { 6862 if (F->hasInClassInitializer()) { 6863 if (Expr *E = F->getInClassInitializer()) 6864 ExceptSpec.CalledExpr(E); 6865 else if (!F->isInvalidDecl()) 6866 ExceptSpec.SetDelayed(); 6867 } else if (const RecordType *RecordTy 6868 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6869 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6870 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6871 // If this is a deleted function, add it anyway. This might be conformant 6872 // with the standard. This might not. I'm not sure. It might not matter. 6873 // In particular, the problem is that this function never gets called. It 6874 // might just be ill-formed because this function attempts to refer to 6875 // a deleted function here. 6876 if (Constructor) 6877 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6878 } 6879 } 6880 6881 return ExceptSpec; 6882} 6883 6884CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6885 CXXRecordDecl *ClassDecl) { 6886 // C++ [class.ctor]p5: 6887 // A default constructor for a class X is a constructor of class X 6888 // that can be called without an argument. If there is no 6889 // user-declared constructor for class X, a default constructor is 6890 // implicitly declared. An implicitly-declared default constructor 6891 // is an inline public member of its class. 6892 assert(!ClassDecl->hasUserDeclaredConstructor() && 6893 "Should not build implicit default constructor!"); 6894 6895 ImplicitExceptionSpecification Spec = 6896 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6897 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6898 6899 // Create the actual constructor declaration. 6900 CanQualType ClassType 6901 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6902 SourceLocation ClassLoc = ClassDecl->getLocation(); 6903 DeclarationName Name 6904 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6905 DeclarationNameInfo NameInfo(Name, ClassLoc); 6906 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6907 Context, ClassDecl, ClassLoc, NameInfo, 6908 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6909 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6910 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 6911 getLangOpts().CPlusPlus0x); 6912 DefaultCon->setAccess(AS_public); 6913 DefaultCon->setDefaulted(); 6914 DefaultCon->setImplicit(); 6915 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6916 6917 // Note that we have declared this constructor. 6918 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6919 6920 if (Scope *S = getScopeForContext(ClassDecl)) 6921 PushOnScopeChains(DefaultCon, S, false); 6922 ClassDecl->addDecl(DefaultCon); 6923 6924 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6925 DefaultCon->setDeletedAsWritten(); 6926 6927 return DefaultCon; 6928} 6929 6930void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6931 CXXConstructorDecl *Constructor) { 6932 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6933 !Constructor->doesThisDeclarationHaveABody() && 6934 !Constructor->isDeleted()) && 6935 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6936 6937 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6938 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6939 6940 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6941 DiagnosticErrorTrap Trap(Diags); 6942 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6943 Trap.hasErrorOccurred()) { 6944 Diag(CurrentLocation, diag::note_member_synthesized_at) 6945 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6946 Constructor->setInvalidDecl(); 6947 return; 6948 } 6949 6950 SourceLocation Loc = Constructor->getLocation(); 6951 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6952 6953 Constructor->setUsed(); 6954 MarkVTableUsed(CurrentLocation, ClassDecl); 6955 6956 if (ASTMutationListener *L = getASTMutationListener()) { 6957 L->CompletedImplicitDefinition(Constructor); 6958 } 6959} 6960 6961/// Get any existing defaulted default constructor for the given class. Do not 6962/// implicitly define one if it does not exist. 6963static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6964 CXXRecordDecl *D) { 6965 ASTContext &Context = Self.Context; 6966 QualType ClassType = Context.getTypeDeclType(D); 6967 DeclarationName ConstructorName 6968 = Context.DeclarationNames.getCXXConstructorName( 6969 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6970 6971 DeclContext::lookup_const_iterator Con, ConEnd; 6972 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6973 Con != ConEnd; ++Con) { 6974 // A function template cannot be defaulted. 6975 if (isa<FunctionTemplateDecl>(*Con)) 6976 continue; 6977 6978 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6979 if (Constructor->isDefaultConstructor()) 6980 return Constructor->isDefaulted() ? Constructor : 0; 6981 } 6982 return 0; 6983} 6984 6985void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6986 if (!D) return; 6987 AdjustDeclIfTemplate(D); 6988 6989 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6990 CXXConstructorDecl *CtorDecl 6991 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6992 6993 if (!CtorDecl) return; 6994 6995 // Compute the exception specification for the default constructor. 6996 const FunctionProtoType *CtorTy = 6997 CtorDecl->getType()->castAs<FunctionProtoType>(); 6998 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6999 // FIXME: Don't do this unless the exception spec is needed. 7000 ImplicitExceptionSpecification Spec = 7001 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 7002 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7003 assert(EPI.ExceptionSpecType != EST_Delayed); 7004 7005 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7006 } 7007 7008 // If the default constructor is explicitly defaulted, checking the exception 7009 // specification is deferred until now. 7010 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 7011 !ClassDecl->isDependentType()) 7012 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 7013} 7014 7015void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7016 // We start with an initial pass over the base classes to collect those that 7017 // inherit constructors from. If there are none, we can forgo all further 7018 // processing. 7019 typedef SmallVector<const RecordType *, 4> BasesVector; 7020 BasesVector BasesToInheritFrom; 7021 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7022 BaseE = ClassDecl->bases_end(); 7023 BaseIt != BaseE; ++BaseIt) { 7024 if (BaseIt->getInheritConstructors()) { 7025 QualType Base = BaseIt->getType(); 7026 if (Base->isDependentType()) { 7027 // If we inherit constructors from anything that is dependent, just 7028 // abort processing altogether. We'll get another chance for the 7029 // instantiations. 7030 return; 7031 } 7032 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7033 } 7034 } 7035 if (BasesToInheritFrom.empty()) 7036 return; 7037 7038 // Now collect the constructors that we already have in the current class. 7039 // Those take precedence over inherited constructors. 7040 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7041 // unless there is a user-declared constructor with the same signature in 7042 // the class where the using-declaration appears. 7043 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7044 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7045 CtorE = ClassDecl->ctor_end(); 7046 CtorIt != CtorE; ++CtorIt) { 7047 ExistingConstructors.insert( 7048 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7049 } 7050 7051 DeclarationName CreatedCtorName = 7052 Context.DeclarationNames.getCXXConstructorName( 7053 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7054 7055 // Now comes the true work. 7056 // First, we keep a map from constructor types to the base that introduced 7057 // them. Needed for finding conflicting constructors. We also keep the 7058 // actually inserted declarations in there, for pretty diagnostics. 7059 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7060 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7061 ConstructorToSourceMap InheritedConstructors; 7062 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7063 BaseE = BasesToInheritFrom.end(); 7064 BaseIt != BaseE; ++BaseIt) { 7065 const RecordType *Base = *BaseIt; 7066 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7067 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7068 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7069 CtorE = BaseDecl->ctor_end(); 7070 CtorIt != CtorE; ++CtorIt) { 7071 // Find the using declaration for inheriting this base's constructors. 7072 // FIXME: Don't perform name lookup just to obtain a source location! 7073 DeclarationName Name = 7074 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7075 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 7076 LookupQualifiedName(Result, CurContext); 7077 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 7078 SourceLocation UsingLoc = UD ? UD->getLocation() : 7079 ClassDecl->getLocation(); 7080 7081 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7082 // from the class X named in the using-declaration consists of actual 7083 // constructors and notional constructors that result from the 7084 // transformation of defaulted parameters as follows: 7085 // - all non-template default constructors of X, and 7086 // - for each non-template constructor of X that has at least one 7087 // parameter with a default argument, the set of constructors that 7088 // results from omitting any ellipsis parameter specification and 7089 // successively omitting parameters with a default argument from the 7090 // end of the parameter-type-list. 7091 CXXConstructorDecl *BaseCtor = *CtorIt; 7092 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7093 const FunctionProtoType *BaseCtorType = 7094 BaseCtor->getType()->getAs<FunctionProtoType>(); 7095 7096 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7097 maxParams = BaseCtor->getNumParams(); 7098 params <= maxParams; ++params) { 7099 // Skip default constructors. They're never inherited. 7100 if (params == 0) 7101 continue; 7102 // Skip copy and move constructors for the same reason. 7103 if (CanBeCopyOrMove && params == 1) 7104 continue; 7105 7106 // Build up a function type for this particular constructor. 7107 // FIXME: The working paper does not consider that the exception spec 7108 // for the inheriting constructor might be larger than that of the 7109 // source. This code doesn't yet, either. When it does, this code will 7110 // need to be delayed until after exception specifications and in-class 7111 // member initializers are attached. 7112 const Type *NewCtorType; 7113 if (params == maxParams) 7114 NewCtorType = BaseCtorType; 7115 else { 7116 SmallVector<QualType, 16> Args; 7117 for (unsigned i = 0; i < params; ++i) { 7118 Args.push_back(BaseCtorType->getArgType(i)); 7119 } 7120 FunctionProtoType::ExtProtoInfo ExtInfo = 7121 BaseCtorType->getExtProtoInfo(); 7122 ExtInfo.Variadic = false; 7123 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7124 Args.data(), params, ExtInfo) 7125 .getTypePtr(); 7126 } 7127 const Type *CanonicalNewCtorType = 7128 Context.getCanonicalType(NewCtorType); 7129 7130 // Now that we have the type, first check if the class already has a 7131 // constructor with this signature. 7132 if (ExistingConstructors.count(CanonicalNewCtorType)) 7133 continue; 7134 7135 // Then we check if we have already declared an inherited constructor 7136 // with this signature. 7137 std::pair<ConstructorToSourceMap::iterator, bool> result = 7138 InheritedConstructors.insert(std::make_pair( 7139 CanonicalNewCtorType, 7140 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7141 if (!result.second) { 7142 // Already in the map. If it came from a different class, that's an 7143 // error. Not if it's from the same. 7144 CanQualType PreviousBase = result.first->second.first; 7145 if (CanonicalBase != PreviousBase) { 7146 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7147 const CXXConstructorDecl *PrevBaseCtor = 7148 PrevCtor->getInheritedConstructor(); 7149 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7150 7151 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7152 Diag(BaseCtor->getLocation(), 7153 diag::note_using_decl_constructor_conflict_current_ctor); 7154 Diag(PrevBaseCtor->getLocation(), 7155 diag::note_using_decl_constructor_conflict_previous_ctor); 7156 Diag(PrevCtor->getLocation(), 7157 diag::note_using_decl_constructor_conflict_previous_using); 7158 } 7159 continue; 7160 } 7161 7162 // OK, we're there, now add the constructor. 7163 // C++0x [class.inhctor]p8: [...] that would be performed by a 7164 // user-written inline constructor [...] 7165 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7166 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7167 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7168 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7169 /*ImplicitlyDeclared=*/true, 7170 // FIXME: Due to a defect in the standard, we treat inherited 7171 // constructors as constexpr even if that makes them ill-formed. 7172 /*Constexpr=*/BaseCtor->isConstexpr()); 7173 NewCtor->setAccess(BaseCtor->getAccess()); 7174 7175 // Build up the parameter decls and add them. 7176 SmallVector<ParmVarDecl *, 16> ParamDecls; 7177 for (unsigned i = 0; i < params; ++i) { 7178 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7179 UsingLoc, UsingLoc, 7180 /*IdentifierInfo=*/0, 7181 BaseCtorType->getArgType(i), 7182 /*TInfo=*/0, SC_None, 7183 SC_None, /*DefaultArg=*/0)); 7184 } 7185 NewCtor->setParams(ParamDecls); 7186 NewCtor->setInheritedConstructor(BaseCtor); 7187 7188 ClassDecl->addDecl(NewCtor); 7189 result.first->second.second = NewCtor; 7190 } 7191 } 7192 } 7193} 7194 7195Sema::ImplicitExceptionSpecification 7196Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7197 // C++ [except.spec]p14: 7198 // An implicitly declared special member function (Clause 12) shall have 7199 // an exception-specification. 7200 ImplicitExceptionSpecification ExceptSpec(*this); 7201 if (ClassDecl->isInvalidDecl()) 7202 return ExceptSpec; 7203 7204 // Direct base-class destructors. 7205 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7206 BEnd = ClassDecl->bases_end(); 7207 B != BEnd; ++B) { 7208 if (B->isVirtual()) // Handled below. 7209 continue; 7210 7211 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7212 ExceptSpec.CalledDecl(B->getLocStart(), 7213 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7214 } 7215 7216 // Virtual base-class destructors. 7217 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7218 BEnd = ClassDecl->vbases_end(); 7219 B != BEnd; ++B) { 7220 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7221 ExceptSpec.CalledDecl(B->getLocStart(), 7222 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7223 } 7224 7225 // Field destructors. 7226 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7227 FEnd = ClassDecl->field_end(); 7228 F != FEnd; ++F) { 7229 if (const RecordType *RecordTy 7230 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7231 ExceptSpec.CalledDecl(F->getLocation(), 7232 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7233 } 7234 7235 return ExceptSpec; 7236} 7237 7238CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7239 // C++ [class.dtor]p2: 7240 // If a class has no user-declared destructor, a destructor is 7241 // declared implicitly. An implicitly-declared destructor is an 7242 // inline public member of its class. 7243 7244 ImplicitExceptionSpecification Spec = 7245 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7246 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7247 7248 // Create the actual destructor declaration. 7249 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7250 7251 CanQualType ClassType 7252 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7253 SourceLocation ClassLoc = ClassDecl->getLocation(); 7254 DeclarationName Name 7255 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7256 DeclarationNameInfo NameInfo(Name, ClassLoc); 7257 CXXDestructorDecl *Destructor 7258 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7259 /*isInline=*/true, 7260 /*isImplicitlyDeclared=*/true); 7261 Destructor->setAccess(AS_public); 7262 Destructor->setDefaulted(); 7263 Destructor->setImplicit(); 7264 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7265 7266 // Note that we have declared this destructor. 7267 ++ASTContext::NumImplicitDestructorsDeclared; 7268 7269 // Introduce this destructor into its scope. 7270 if (Scope *S = getScopeForContext(ClassDecl)) 7271 PushOnScopeChains(Destructor, S, false); 7272 ClassDecl->addDecl(Destructor); 7273 7274 // This could be uniqued if it ever proves significant. 7275 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7276 7277 AddOverriddenMethods(ClassDecl, Destructor); 7278 7279 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7280 Destructor->setDeletedAsWritten(); 7281 7282 return Destructor; 7283} 7284 7285void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7286 CXXDestructorDecl *Destructor) { 7287 assert((Destructor->isDefaulted() && 7288 !Destructor->doesThisDeclarationHaveABody() && 7289 !Destructor->isDeleted()) && 7290 "DefineImplicitDestructor - call it for implicit default dtor"); 7291 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7292 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7293 7294 if (Destructor->isInvalidDecl()) 7295 return; 7296 7297 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7298 7299 DiagnosticErrorTrap Trap(Diags); 7300 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7301 Destructor->getParent()); 7302 7303 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7304 Diag(CurrentLocation, diag::note_member_synthesized_at) 7305 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7306 7307 Destructor->setInvalidDecl(); 7308 return; 7309 } 7310 7311 SourceLocation Loc = Destructor->getLocation(); 7312 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7313 Destructor->setImplicitlyDefined(true); 7314 Destructor->setUsed(); 7315 MarkVTableUsed(CurrentLocation, ClassDecl); 7316 7317 if (ASTMutationListener *L = getASTMutationListener()) { 7318 L->CompletedImplicitDefinition(Destructor); 7319 } 7320} 7321 7322/// \brief Perform any semantic analysis which needs to be delayed until all 7323/// pending class member declarations have been parsed. 7324void Sema::ActOnFinishCXXMemberDecls() { 7325 // Now we have parsed all exception specifications, determine the implicit 7326 // exception specifications for destructors. 7327 for (unsigned i = 0, e = DelayedDestructorExceptionSpecs.size(); 7328 i != e; ++i) { 7329 CXXDestructorDecl *Dtor = DelayedDestructorExceptionSpecs[i]; 7330 AdjustDestructorExceptionSpec(Dtor->getParent(), Dtor, true); 7331 } 7332 DelayedDestructorExceptionSpecs.clear(); 7333 7334 // Perform any deferred checking of exception specifications for virtual 7335 // destructors. 7336 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7337 i != e; ++i) { 7338 const CXXDestructorDecl *Dtor = 7339 DelayedDestructorExceptionSpecChecks[i].first; 7340 assert(!Dtor->getParent()->isDependentType() && 7341 "Should not ever add destructors of templates into the list."); 7342 CheckOverridingFunctionExceptionSpec(Dtor, 7343 DelayedDestructorExceptionSpecChecks[i].second); 7344 } 7345 DelayedDestructorExceptionSpecChecks.clear(); 7346} 7347 7348void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7349 CXXDestructorDecl *destructor, 7350 bool WasDelayed) { 7351 // C++11 [class.dtor]p3: 7352 // A declaration of a destructor that does not have an exception- 7353 // specification is implicitly considered to have the same exception- 7354 // specification as an implicit declaration. 7355 const FunctionProtoType *dtorType = destructor->getType()-> 7356 getAs<FunctionProtoType>(); 7357 if (!WasDelayed && dtorType->hasExceptionSpec()) 7358 return; 7359 7360 ImplicitExceptionSpecification exceptSpec = 7361 ComputeDefaultedDtorExceptionSpec(classDecl); 7362 7363 // Replace the destructor's type, building off the existing one. Fortunately, 7364 // the only thing of interest in the destructor type is its extended info. 7365 // The return and arguments are fixed. 7366 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7367 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7368 epi.NumExceptions = exceptSpec.size(); 7369 epi.Exceptions = exceptSpec.data(); 7370 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7371 7372 destructor->setType(ty); 7373 7374 // If we can't compute the exception specification for this destructor yet 7375 // (because it depends on an exception specification which we have not parsed 7376 // yet), make a note that we need to try again when the class is complete. 7377 if (epi.ExceptionSpecType == EST_Delayed) { 7378 assert(!WasDelayed && "couldn't compute destructor exception spec"); 7379 DelayedDestructorExceptionSpecs.push_back(destructor); 7380 } 7381 7382 // FIXME: If the destructor has a body that could throw, and the newly created 7383 // spec doesn't allow exceptions, we should emit a warning, because this 7384 // change in behavior can break conforming C++03 programs at runtime. 7385 // However, we don't have a body yet, so it needs to be done somewhere else. 7386} 7387 7388/// \brief Builds a statement that copies/moves the given entity from \p From to 7389/// \c To. 7390/// 7391/// This routine is used to copy/move the members of a class with an 7392/// implicitly-declared copy/move assignment operator. When the entities being 7393/// copied are arrays, this routine builds for loops to copy them. 7394/// 7395/// \param S The Sema object used for type-checking. 7396/// 7397/// \param Loc The location where the implicit copy/move is being generated. 7398/// 7399/// \param T The type of the expressions being copied/moved. Both expressions 7400/// must have this type. 7401/// 7402/// \param To The expression we are copying/moving to. 7403/// 7404/// \param From The expression we are copying/moving from. 7405/// 7406/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7407/// Otherwise, it's a non-static member subobject. 7408/// 7409/// \param Copying Whether we're copying or moving. 7410/// 7411/// \param Depth Internal parameter recording the depth of the recursion. 7412/// 7413/// \returns A statement or a loop that copies the expressions. 7414static StmtResult 7415BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7416 Expr *To, Expr *From, 7417 bool CopyingBaseSubobject, bool Copying, 7418 unsigned Depth = 0) { 7419 // C++0x [class.copy]p28: 7420 // Each subobject is assigned in the manner appropriate to its type: 7421 // 7422 // - if the subobject is of class type, as if by a call to operator= with 7423 // the subobject as the object expression and the corresponding 7424 // subobject of x as a single function argument (as if by explicit 7425 // qualification; that is, ignoring any possible virtual overriding 7426 // functions in more derived classes); 7427 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7428 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7429 7430 // Look for operator=. 7431 DeclarationName Name 7432 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7433 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7434 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7435 7436 // Filter out any result that isn't a copy/move-assignment operator. 7437 LookupResult::Filter F = OpLookup.makeFilter(); 7438 while (F.hasNext()) { 7439 NamedDecl *D = F.next(); 7440 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7441 if (Method->isCopyAssignmentOperator() || 7442 (!Copying && Method->isMoveAssignmentOperator())) 7443 continue; 7444 7445 F.erase(); 7446 } 7447 F.done(); 7448 7449 // Suppress the protected check (C++ [class.protected]) for each of the 7450 // assignment operators we found. This strange dance is required when 7451 // we're assigning via a base classes's copy-assignment operator. To 7452 // ensure that we're getting the right base class subobject (without 7453 // ambiguities), we need to cast "this" to that subobject type; to 7454 // ensure that we don't go through the virtual call mechanism, we need 7455 // to qualify the operator= name with the base class (see below). However, 7456 // this means that if the base class has a protected copy assignment 7457 // operator, the protected member access check will fail. So, we 7458 // rewrite "protected" access to "public" access in this case, since we 7459 // know by construction that we're calling from a derived class. 7460 if (CopyingBaseSubobject) { 7461 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7462 L != LEnd; ++L) { 7463 if (L.getAccess() == AS_protected) 7464 L.setAccess(AS_public); 7465 } 7466 } 7467 7468 // Create the nested-name-specifier that will be used to qualify the 7469 // reference to operator=; this is required to suppress the virtual 7470 // call mechanism. 7471 CXXScopeSpec SS; 7472 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7473 SS.MakeTrivial(S.Context, 7474 NestedNameSpecifier::Create(S.Context, 0, false, 7475 CanonicalT), 7476 Loc); 7477 7478 // Create the reference to operator=. 7479 ExprResult OpEqualRef 7480 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7481 /*TemplateKWLoc=*/SourceLocation(), 7482 /*FirstQualifierInScope=*/0, 7483 OpLookup, 7484 /*TemplateArgs=*/0, 7485 /*SuppressQualifierCheck=*/true); 7486 if (OpEqualRef.isInvalid()) 7487 return StmtError(); 7488 7489 // Build the call to the assignment operator. 7490 7491 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7492 OpEqualRef.takeAs<Expr>(), 7493 Loc, &From, 1, Loc); 7494 if (Call.isInvalid()) 7495 return StmtError(); 7496 7497 return S.Owned(Call.takeAs<Stmt>()); 7498 } 7499 7500 // - if the subobject is of scalar type, the built-in assignment 7501 // operator is used. 7502 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7503 if (!ArrayTy) { 7504 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7505 if (Assignment.isInvalid()) 7506 return StmtError(); 7507 7508 return S.Owned(Assignment.takeAs<Stmt>()); 7509 } 7510 7511 // - if the subobject is an array, each element is assigned, in the 7512 // manner appropriate to the element type; 7513 7514 // Construct a loop over the array bounds, e.g., 7515 // 7516 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7517 // 7518 // that will copy each of the array elements. 7519 QualType SizeType = S.Context.getSizeType(); 7520 7521 // Create the iteration variable. 7522 IdentifierInfo *IterationVarName = 0; 7523 { 7524 SmallString<8> Str; 7525 llvm::raw_svector_ostream OS(Str); 7526 OS << "__i" << Depth; 7527 IterationVarName = &S.Context.Idents.get(OS.str()); 7528 } 7529 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7530 IterationVarName, SizeType, 7531 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7532 SC_None, SC_None); 7533 7534 // Initialize the iteration variable to zero. 7535 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7536 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7537 7538 // Create a reference to the iteration variable; we'll use this several 7539 // times throughout. 7540 Expr *IterationVarRef 7541 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7542 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7543 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7544 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7545 7546 // Create the DeclStmt that holds the iteration variable. 7547 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7548 7549 // Create the comparison against the array bound. 7550 llvm::APInt Upper 7551 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7552 Expr *Comparison 7553 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7554 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7555 BO_NE, S.Context.BoolTy, 7556 VK_RValue, OK_Ordinary, Loc); 7557 7558 // Create the pre-increment of the iteration variable. 7559 Expr *Increment 7560 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7561 VK_LValue, OK_Ordinary, Loc); 7562 7563 // Subscript the "from" and "to" expressions with the iteration variable. 7564 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7565 IterationVarRefRVal, 7566 Loc)); 7567 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7568 IterationVarRefRVal, 7569 Loc)); 7570 if (!Copying) // Cast to rvalue 7571 From = CastForMoving(S, From); 7572 7573 // Build the copy/move for an individual element of the array. 7574 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7575 To, From, CopyingBaseSubobject, 7576 Copying, Depth + 1); 7577 if (Copy.isInvalid()) 7578 return StmtError(); 7579 7580 // Construct the loop that copies all elements of this array. 7581 return S.ActOnForStmt(Loc, Loc, InitStmt, 7582 S.MakeFullExpr(Comparison), 7583 0, S.MakeFullExpr(Increment), 7584 Loc, Copy.take()); 7585} 7586 7587std::pair<Sema::ImplicitExceptionSpecification, bool> 7588Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7589 CXXRecordDecl *ClassDecl) { 7590 if (ClassDecl->isInvalidDecl()) 7591 return std::make_pair(ImplicitExceptionSpecification(*this), false); 7592 7593 // C++ [class.copy]p10: 7594 // If the class definition does not explicitly declare a copy 7595 // assignment operator, one is declared implicitly. 7596 // The implicitly-defined copy assignment operator for a class X 7597 // will have the form 7598 // 7599 // X& X::operator=(const X&) 7600 // 7601 // if 7602 bool HasConstCopyAssignment = true; 7603 7604 // -- each direct base class B of X has a copy assignment operator 7605 // whose parameter is of type const B&, const volatile B& or B, 7606 // and 7607 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7608 BaseEnd = ClassDecl->bases_end(); 7609 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7610 // We'll handle this below 7611 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7612 continue; 7613 7614 assert(!Base->getType()->isDependentType() && 7615 "Cannot generate implicit members for class with dependent bases."); 7616 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7617 HasConstCopyAssignment &= 7618 (bool)LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7619 false, 0); 7620 } 7621 7622 // In C++11, the above citation has "or virtual" added 7623 if (LangOpts.CPlusPlus0x) { 7624 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7625 BaseEnd = ClassDecl->vbases_end(); 7626 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7627 assert(!Base->getType()->isDependentType() && 7628 "Cannot generate implicit members for class with dependent bases."); 7629 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7630 HasConstCopyAssignment &= 7631 (bool)LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7632 false, 0); 7633 } 7634 } 7635 7636 // -- for all the nonstatic data members of X that are of a class 7637 // type M (or array thereof), each such class type has a copy 7638 // assignment operator whose parameter is of type const M&, 7639 // const volatile M& or M. 7640 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7641 FieldEnd = ClassDecl->field_end(); 7642 HasConstCopyAssignment && Field != FieldEnd; 7643 ++Field) { 7644 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7645 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7646 HasConstCopyAssignment &= 7647 (bool)LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7648 false, 0); 7649 } 7650 } 7651 7652 // Otherwise, the implicitly declared copy assignment operator will 7653 // have the form 7654 // 7655 // X& X::operator=(X&) 7656 7657 // C++ [except.spec]p14: 7658 // An implicitly declared special member function (Clause 12) shall have an 7659 // exception-specification. [...] 7660 7661 // It is unspecified whether or not an implicit copy assignment operator 7662 // attempts to deduplicate calls to assignment operators of virtual bases are 7663 // made. As such, this exception specification is effectively unspecified. 7664 // Based on a similar decision made for constness in C++0x, we're erring on 7665 // the side of assuming such calls to be made regardless of whether they 7666 // actually happen. 7667 ImplicitExceptionSpecification ExceptSpec(*this); 7668 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7669 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7670 BaseEnd = ClassDecl->bases_end(); 7671 Base != BaseEnd; ++Base) { 7672 if (Base->isVirtual()) 7673 continue; 7674 7675 CXXRecordDecl *BaseClassDecl 7676 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7677 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7678 ArgQuals, false, 0)) 7679 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7680 } 7681 7682 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7683 BaseEnd = ClassDecl->vbases_end(); 7684 Base != BaseEnd; ++Base) { 7685 CXXRecordDecl *BaseClassDecl 7686 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7687 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7688 ArgQuals, false, 0)) 7689 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7690 } 7691 7692 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7693 FieldEnd = ClassDecl->field_end(); 7694 Field != FieldEnd; 7695 ++Field) { 7696 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7697 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7698 if (CXXMethodDecl *CopyAssign = 7699 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7700 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7701 } 7702 } 7703 7704 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7705} 7706 7707CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7708 // Note: The following rules are largely analoguous to the copy 7709 // constructor rules. Note that virtual bases are not taken into account 7710 // for determining the argument type of the operator. Note also that 7711 // operators taking an object instead of a reference are allowed. 7712 7713 ImplicitExceptionSpecification Spec(*this); 7714 bool Const; 7715 llvm::tie(Spec, Const) = 7716 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7717 7718 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7719 QualType RetType = Context.getLValueReferenceType(ArgType); 7720 if (Const) 7721 ArgType = ArgType.withConst(); 7722 ArgType = Context.getLValueReferenceType(ArgType); 7723 7724 // An implicitly-declared copy assignment operator is an inline public 7725 // member of its class. 7726 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7727 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7728 SourceLocation ClassLoc = ClassDecl->getLocation(); 7729 DeclarationNameInfo NameInfo(Name, ClassLoc); 7730 CXXMethodDecl *CopyAssignment 7731 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7732 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7733 /*TInfo=*/0, /*isStatic=*/false, 7734 /*StorageClassAsWritten=*/SC_None, 7735 /*isInline=*/true, /*isConstexpr=*/false, 7736 SourceLocation()); 7737 CopyAssignment->setAccess(AS_public); 7738 CopyAssignment->setDefaulted(); 7739 CopyAssignment->setImplicit(); 7740 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7741 7742 // Add the parameter to the operator. 7743 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7744 ClassLoc, ClassLoc, /*Id=*/0, 7745 ArgType, /*TInfo=*/0, 7746 SC_None, 7747 SC_None, 0); 7748 CopyAssignment->setParams(FromParam); 7749 7750 // Note that we have added this copy-assignment operator. 7751 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7752 7753 if (Scope *S = getScopeForContext(ClassDecl)) 7754 PushOnScopeChains(CopyAssignment, S, false); 7755 ClassDecl->addDecl(CopyAssignment); 7756 7757 // C++0x [class.copy]p19: 7758 // .... If the class definition does not explicitly declare a copy 7759 // assignment operator, there is no user-declared move constructor, and 7760 // there is no user-declared move assignment operator, a copy assignment 7761 // operator is implicitly declared as defaulted. 7762 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7763 CopyAssignment->setDeletedAsWritten(); 7764 7765 AddOverriddenMethods(ClassDecl, CopyAssignment); 7766 return CopyAssignment; 7767} 7768 7769void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7770 CXXMethodDecl *CopyAssignOperator) { 7771 assert((CopyAssignOperator->isDefaulted() && 7772 CopyAssignOperator->isOverloadedOperator() && 7773 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7774 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7775 !CopyAssignOperator->isDeleted()) && 7776 "DefineImplicitCopyAssignment called for wrong function"); 7777 7778 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7779 7780 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7781 CopyAssignOperator->setInvalidDecl(); 7782 return; 7783 } 7784 7785 CopyAssignOperator->setUsed(); 7786 7787 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7788 DiagnosticErrorTrap Trap(Diags); 7789 7790 // C++0x [class.copy]p30: 7791 // The implicitly-defined or explicitly-defaulted copy assignment operator 7792 // for a non-union class X performs memberwise copy assignment of its 7793 // subobjects. The direct base classes of X are assigned first, in the 7794 // order of their declaration in the base-specifier-list, and then the 7795 // immediate non-static data members of X are assigned, in the order in 7796 // which they were declared in the class definition. 7797 7798 // The statements that form the synthesized function body. 7799 ASTOwningVector<Stmt*> Statements(*this); 7800 7801 // The parameter for the "other" object, which we are copying from. 7802 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7803 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7804 QualType OtherRefType = Other->getType(); 7805 if (const LValueReferenceType *OtherRef 7806 = OtherRefType->getAs<LValueReferenceType>()) { 7807 OtherRefType = OtherRef->getPointeeType(); 7808 OtherQuals = OtherRefType.getQualifiers(); 7809 } 7810 7811 // Our location for everything implicitly-generated. 7812 SourceLocation Loc = CopyAssignOperator->getLocation(); 7813 7814 // Construct a reference to the "other" object. We'll be using this 7815 // throughout the generated ASTs. 7816 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7817 assert(OtherRef && "Reference to parameter cannot fail!"); 7818 7819 // Construct the "this" pointer. We'll be using this throughout the generated 7820 // ASTs. 7821 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7822 assert(This && "Reference to this cannot fail!"); 7823 7824 // Assign base classes. 7825 bool Invalid = false; 7826 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7827 E = ClassDecl->bases_end(); Base != E; ++Base) { 7828 // Form the assignment: 7829 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7830 QualType BaseType = Base->getType().getUnqualifiedType(); 7831 if (!BaseType->isRecordType()) { 7832 Invalid = true; 7833 continue; 7834 } 7835 7836 CXXCastPath BasePath; 7837 BasePath.push_back(Base); 7838 7839 // Construct the "from" expression, which is an implicit cast to the 7840 // appropriately-qualified base type. 7841 Expr *From = OtherRef; 7842 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7843 CK_UncheckedDerivedToBase, 7844 VK_LValue, &BasePath).take(); 7845 7846 // Dereference "this". 7847 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7848 7849 // Implicitly cast "this" to the appropriately-qualified base type. 7850 To = ImpCastExprToType(To.take(), 7851 Context.getCVRQualifiedType(BaseType, 7852 CopyAssignOperator->getTypeQualifiers()), 7853 CK_UncheckedDerivedToBase, 7854 VK_LValue, &BasePath); 7855 7856 // Build the copy. 7857 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7858 To.get(), From, 7859 /*CopyingBaseSubobject=*/true, 7860 /*Copying=*/true); 7861 if (Copy.isInvalid()) { 7862 Diag(CurrentLocation, diag::note_member_synthesized_at) 7863 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7864 CopyAssignOperator->setInvalidDecl(); 7865 return; 7866 } 7867 7868 // Success! Record the copy. 7869 Statements.push_back(Copy.takeAs<Expr>()); 7870 } 7871 7872 // \brief Reference to the __builtin_memcpy function. 7873 Expr *BuiltinMemCpyRef = 0; 7874 // \brief Reference to the __builtin_objc_memmove_collectable function. 7875 Expr *CollectableMemCpyRef = 0; 7876 7877 // Assign non-static members. 7878 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7879 FieldEnd = ClassDecl->field_end(); 7880 Field != FieldEnd; ++Field) { 7881 if (Field->isUnnamedBitfield()) 7882 continue; 7883 7884 // Check for members of reference type; we can't copy those. 7885 if (Field->getType()->isReferenceType()) { 7886 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7887 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7888 Diag(Field->getLocation(), diag::note_declared_at); 7889 Diag(CurrentLocation, diag::note_member_synthesized_at) 7890 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7891 Invalid = true; 7892 continue; 7893 } 7894 7895 // Check for members of const-qualified, non-class type. 7896 QualType BaseType = Context.getBaseElementType(Field->getType()); 7897 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7898 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7899 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7900 Diag(Field->getLocation(), diag::note_declared_at); 7901 Diag(CurrentLocation, diag::note_member_synthesized_at) 7902 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7903 Invalid = true; 7904 continue; 7905 } 7906 7907 // Suppress assigning zero-width bitfields. 7908 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7909 continue; 7910 7911 QualType FieldType = Field->getType().getNonReferenceType(); 7912 if (FieldType->isIncompleteArrayType()) { 7913 assert(ClassDecl->hasFlexibleArrayMember() && 7914 "Incomplete array type is not valid"); 7915 continue; 7916 } 7917 7918 // Build references to the field in the object we're copying from and to. 7919 CXXScopeSpec SS; // Intentionally empty 7920 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7921 LookupMemberName); 7922 MemberLookup.addDecl(*Field); 7923 MemberLookup.resolveKind(); 7924 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7925 Loc, /*IsArrow=*/false, 7926 SS, SourceLocation(), 0, 7927 MemberLookup, 0); 7928 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7929 Loc, /*IsArrow=*/true, 7930 SS, SourceLocation(), 0, 7931 MemberLookup, 0); 7932 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7933 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7934 7935 // If the field should be copied with __builtin_memcpy rather than via 7936 // explicit assignments, do so. This optimization only applies for arrays 7937 // of scalars and arrays of class type with trivial copy-assignment 7938 // operators. 7939 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7940 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7941 // Compute the size of the memory buffer to be copied. 7942 QualType SizeType = Context.getSizeType(); 7943 llvm::APInt Size(Context.getTypeSize(SizeType), 7944 Context.getTypeSizeInChars(BaseType).getQuantity()); 7945 for (const ConstantArrayType *Array 7946 = Context.getAsConstantArrayType(FieldType); 7947 Array; 7948 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7949 llvm::APInt ArraySize 7950 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7951 Size *= ArraySize; 7952 } 7953 7954 // Take the address of the field references for "from" and "to". 7955 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7956 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7957 7958 bool NeedsCollectableMemCpy = 7959 (BaseType->isRecordType() && 7960 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7961 7962 if (NeedsCollectableMemCpy) { 7963 if (!CollectableMemCpyRef) { 7964 // Create a reference to the __builtin_objc_memmove_collectable function. 7965 LookupResult R(*this, 7966 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7967 Loc, LookupOrdinaryName); 7968 LookupName(R, TUScope, true); 7969 7970 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7971 if (!CollectableMemCpy) { 7972 // Something went horribly wrong earlier, and we will have 7973 // complained about it. 7974 Invalid = true; 7975 continue; 7976 } 7977 7978 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7979 CollectableMemCpy->getType(), 7980 VK_LValue, Loc, 0).take(); 7981 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7982 } 7983 } 7984 // Create a reference to the __builtin_memcpy builtin function. 7985 else if (!BuiltinMemCpyRef) { 7986 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7987 LookupOrdinaryName); 7988 LookupName(R, TUScope, true); 7989 7990 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7991 if (!BuiltinMemCpy) { 7992 // Something went horribly wrong earlier, and we will have complained 7993 // about it. 7994 Invalid = true; 7995 continue; 7996 } 7997 7998 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7999 BuiltinMemCpy->getType(), 8000 VK_LValue, Loc, 0).take(); 8001 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8002 } 8003 8004 ASTOwningVector<Expr*> CallArgs(*this); 8005 CallArgs.push_back(To.takeAs<Expr>()); 8006 CallArgs.push_back(From.takeAs<Expr>()); 8007 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8008 ExprResult Call = ExprError(); 8009 if (NeedsCollectableMemCpy) 8010 Call = ActOnCallExpr(/*Scope=*/0, 8011 CollectableMemCpyRef, 8012 Loc, move_arg(CallArgs), 8013 Loc); 8014 else 8015 Call = ActOnCallExpr(/*Scope=*/0, 8016 BuiltinMemCpyRef, 8017 Loc, move_arg(CallArgs), 8018 Loc); 8019 8020 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8021 Statements.push_back(Call.takeAs<Expr>()); 8022 continue; 8023 } 8024 8025 // Build the copy of this field. 8026 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 8027 To.get(), From.get(), 8028 /*CopyingBaseSubobject=*/false, 8029 /*Copying=*/true); 8030 if (Copy.isInvalid()) { 8031 Diag(CurrentLocation, diag::note_member_synthesized_at) 8032 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8033 CopyAssignOperator->setInvalidDecl(); 8034 return; 8035 } 8036 8037 // Success! Record the copy. 8038 Statements.push_back(Copy.takeAs<Stmt>()); 8039 } 8040 8041 if (!Invalid) { 8042 // Add a "return *this;" 8043 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8044 8045 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8046 if (Return.isInvalid()) 8047 Invalid = true; 8048 else { 8049 Statements.push_back(Return.takeAs<Stmt>()); 8050 8051 if (Trap.hasErrorOccurred()) { 8052 Diag(CurrentLocation, diag::note_member_synthesized_at) 8053 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8054 Invalid = true; 8055 } 8056 } 8057 } 8058 8059 if (Invalid) { 8060 CopyAssignOperator->setInvalidDecl(); 8061 return; 8062 } 8063 8064 StmtResult Body; 8065 { 8066 CompoundScopeRAII CompoundScope(*this); 8067 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8068 /*isStmtExpr=*/false); 8069 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8070 } 8071 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8072 8073 if (ASTMutationListener *L = getASTMutationListener()) { 8074 L->CompletedImplicitDefinition(CopyAssignOperator); 8075 } 8076} 8077 8078Sema::ImplicitExceptionSpecification 8079Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 8080 ImplicitExceptionSpecification ExceptSpec(*this); 8081 8082 if (ClassDecl->isInvalidDecl()) 8083 return ExceptSpec; 8084 8085 // C++0x [except.spec]p14: 8086 // An implicitly declared special member function (Clause 12) shall have an 8087 // exception-specification. [...] 8088 8089 // It is unspecified whether or not an implicit move assignment operator 8090 // attempts to deduplicate calls to assignment operators of virtual bases are 8091 // made. As such, this exception specification is effectively unspecified. 8092 // Based on a similar decision made for constness in C++0x, we're erring on 8093 // the side of assuming such calls to be made regardless of whether they 8094 // actually happen. 8095 // Note that a move constructor is not implicitly declared when there are 8096 // virtual bases, but it can still be user-declared and explicitly defaulted. 8097 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8098 BaseEnd = ClassDecl->bases_end(); 8099 Base != BaseEnd; ++Base) { 8100 if (Base->isVirtual()) 8101 continue; 8102 8103 CXXRecordDecl *BaseClassDecl 8104 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8105 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8106 false, 0)) 8107 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8108 } 8109 8110 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8111 BaseEnd = ClassDecl->vbases_end(); 8112 Base != BaseEnd; ++Base) { 8113 CXXRecordDecl *BaseClassDecl 8114 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8115 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8116 false, 0)) 8117 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8118 } 8119 8120 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8121 FieldEnd = ClassDecl->field_end(); 8122 Field != FieldEnd; 8123 ++Field) { 8124 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8125 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8126 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8127 false, 0)) 8128 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8129 } 8130 } 8131 8132 return ExceptSpec; 8133} 8134 8135/// Determine whether the class type has any direct or indirect virtual base 8136/// classes which have a non-trivial move assignment operator. 8137static bool 8138hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8139 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8140 BaseEnd = ClassDecl->vbases_end(); 8141 Base != BaseEnd; ++Base) { 8142 CXXRecordDecl *BaseClass = 8143 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8144 8145 // Try to declare the move assignment. If it would be deleted, then the 8146 // class does not have a non-trivial move assignment. 8147 if (BaseClass->needsImplicitMoveAssignment()) 8148 S.DeclareImplicitMoveAssignment(BaseClass); 8149 8150 // If the class has both a trivial move assignment and a non-trivial move 8151 // assignment, hasTrivialMoveAssignment() is false. 8152 if (BaseClass->hasDeclaredMoveAssignment() && 8153 !BaseClass->hasTrivialMoveAssignment()) 8154 return true; 8155 } 8156 8157 return false; 8158} 8159 8160/// Determine whether the given type either has a move constructor or is 8161/// trivially copyable. 8162static bool 8163hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8164 Type = S.Context.getBaseElementType(Type); 8165 8166 // FIXME: Technically, non-trivially-copyable non-class types, such as 8167 // reference types, are supposed to return false here, but that appears 8168 // to be a standard defect. 8169 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8170 if (!ClassDecl) 8171 return true; 8172 8173 if (Type.isTriviallyCopyableType(S.Context)) 8174 return true; 8175 8176 if (IsConstructor) { 8177 if (ClassDecl->needsImplicitMoveConstructor()) 8178 S.DeclareImplicitMoveConstructor(ClassDecl); 8179 return ClassDecl->hasDeclaredMoveConstructor(); 8180 } 8181 8182 if (ClassDecl->needsImplicitMoveAssignment()) 8183 S.DeclareImplicitMoveAssignment(ClassDecl); 8184 return ClassDecl->hasDeclaredMoveAssignment(); 8185} 8186 8187/// Determine whether all non-static data members and direct or virtual bases 8188/// of class \p ClassDecl have either a move operation, or are trivially 8189/// copyable. 8190static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8191 bool IsConstructor) { 8192 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8193 BaseEnd = ClassDecl->bases_end(); 8194 Base != BaseEnd; ++Base) { 8195 if (Base->isVirtual()) 8196 continue; 8197 8198 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8199 return false; 8200 } 8201 8202 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8203 BaseEnd = ClassDecl->vbases_end(); 8204 Base != BaseEnd; ++Base) { 8205 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8206 return false; 8207 } 8208 8209 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8210 FieldEnd = ClassDecl->field_end(); 8211 Field != FieldEnd; ++Field) { 8212 if (!hasMoveOrIsTriviallyCopyable(S, (*Field)->getType(), IsConstructor)) 8213 return false; 8214 } 8215 8216 return true; 8217} 8218 8219CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8220 // C++11 [class.copy]p20: 8221 // If the definition of a class X does not explicitly declare a move 8222 // assignment operator, one will be implicitly declared as defaulted 8223 // if and only if: 8224 // 8225 // - [first 4 bullets] 8226 assert(ClassDecl->needsImplicitMoveAssignment()); 8227 8228 // [Checked after we build the declaration] 8229 // - the move assignment operator would not be implicitly defined as 8230 // deleted, 8231 8232 // [DR1402]: 8233 // - X has no direct or indirect virtual base class with a non-trivial 8234 // move assignment operator, and 8235 // - each of X's non-static data members and direct or virtual base classes 8236 // has a type that either has a move assignment operator or is trivially 8237 // copyable. 8238 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8239 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8240 ClassDecl->setFailedImplicitMoveAssignment(); 8241 return 0; 8242 } 8243 8244 // Note: The following rules are largely analoguous to the move 8245 // constructor rules. 8246 8247 ImplicitExceptionSpecification Spec( 8248 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8249 8250 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8251 QualType RetType = Context.getLValueReferenceType(ArgType); 8252 ArgType = Context.getRValueReferenceType(ArgType); 8253 8254 // An implicitly-declared move assignment operator is an inline public 8255 // member of its class. 8256 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8257 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8258 SourceLocation ClassLoc = ClassDecl->getLocation(); 8259 DeclarationNameInfo NameInfo(Name, ClassLoc); 8260 CXXMethodDecl *MoveAssignment 8261 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8262 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8263 /*TInfo=*/0, /*isStatic=*/false, 8264 /*StorageClassAsWritten=*/SC_None, 8265 /*isInline=*/true, 8266 /*isConstexpr=*/false, 8267 SourceLocation()); 8268 MoveAssignment->setAccess(AS_public); 8269 MoveAssignment->setDefaulted(); 8270 MoveAssignment->setImplicit(); 8271 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8272 8273 // Add the parameter to the operator. 8274 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8275 ClassLoc, ClassLoc, /*Id=*/0, 8276 ArgType, /*TInfo=*/0, 8277 SC_None, 8278 SC_None, 0); 8279 MoveAssignment->setParams(FromParam); 8280 8281 // Note that we have added this copy-assignment operator. 8282 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8283 8284 // C++0x [class.copy]p9: 8285 // If the definition of a class X does not explicitly declare a move 8286 // assignment operator, one will be implicitly declared as defaulted if and 8287 // only if: 8288 // [...] 8289 // - the move assignment operator would not be implicitly defined as 8290 // deleted. 8291 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8292 // Cache this result so that we don't try to generate this over and over 8293 // on every lookup, leaking memory and wasting time. 8294 ClassDecl->setFailedImplicitMoveAssignment(); 8295 return 0; 8296 } 8297 8298 if (Scope *S = getScopeForContext(ClassDecl)) 8299 PushOnScopeChains(MoveAssignment, S, false); 8300 ClassDecl->addDecl(MoveAssignment); 8301 8302 AddOverriddenMethods(ClassDecl, MoveAssignment); 8303 return MoveAssignment; 8304} 8305 8306void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8307 CXXMethodDecl *MoveAssignOperator) { 8308 assert((MoveAssignOperator->isDefaulted() && 8309 MoveAssignOperator->isOverloadedOperator() && 8310 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8311 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8312 !MoveAssignOperator->isDeleted()) && 8313 "DefineImplicitMoveAssignment called for wrong function"); 8314 8315 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8316 8317 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8318 MoveAssignOperator->setInvalidDecl(); 8319 return; 8320 } 8321 8322 MoveAssignOperator->setUsed(); 8323 8324 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8325 DiagnosticErrorTrap Trap(Diags); 8326 8327 // C++0x [class.copy]p28: 8328 // The implicitly-defined or move assignment operator for a non-union class 8329 // X performs memberwise move assignment of its subobjects. The direct base 8330 // classes of X are assigned first, in the order of their declaration in the 8331 // base-specifier-list, and then the immediate non-static data members of X 8332 // are assigned, in the order in which they were declared in the class 8333 // definition. 8334 8335 // The statements that form the synthesized function body. 8336 ASTOwningVector<Stmt*> Statements(*this); 8337 8338 // The parameter for the "other" object, which we are move from. 8339 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8340 QualType OtherRefType = Other->getType()-> 8341 getAs<RValueReferenceType>()->getPointeeType(); 8342 assert(OtherRefType.getQualifiers() == 0 && 8343 "Bad argument type of defaulted move assignment"); 8344 8345 // Our location for everything implicitly-generated. 8346 SourceLocation Loc = MoveAssignOperator->getLocation(); 8347 8348 // Construct a reference to the "other" object. We'll be using this 8349 // throughout the generated ASTs. 8350 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8351 assert(OtherRef && "Reference to parameter cannot fail!"); 8352 // Cast to rvalue. 8353 OtherRef = CastForMoving(*this, OtherRef); 8354 8355 // Construct the "this" pointer. We'll be using this throughout the generated 8356 // ASTs. 8357 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8358 assert(This && "Reference to this cannot fail!"); 8359 8360 // Assign base classes. 8361 bool Invalid = false; 8362 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8363 E = ClassDecl->bases_end(); Base != E; ++Base) { 8364 // Form the assignment: 8365 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8366 QualType BaseType = Base->getType().getUnqualifiedType(); 8367 if (!BaseType->isRecordType()) { 8368 Invalid = true; 8369 continue; 8370 } 8371 8372 CXXCastPath BasePath; 8373 BasePath.push_back(Base); 8374 8375 // Construct the "from" expression, which is an implicit cast to the 8376 // appropriately-qualified base type. 8377 Expr *From = OtherRef; 8378 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8379 VK_XValue, &BasePath).take(); 8380 8381 // Dereference "this". 8382 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8383 8384 // Implicitly cast "this" to the appropriately-qualified base type. 8385 To = ImpCastExprToType(To.take(), 8386 Context.getCVRQualifiedType(BaseType, 8387 MoveAssignOperator->getTypeQualifiers()), 8388 CK_UncheckedDerivedToBase, 8389 VK_LValue, &BasePath); 8390 8391 // Build the move. 8392 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8393 To.get(), From, 8394 /*CopyingBaseSubobject=*/true, 8395 /*Copying=*/false); 8396 if (Move.isInvalid()) { 8397 Diag(CurrentLocation, diag::note_member_synthesized_at) 8398 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8399 MoveAssignOperator->setInvalidDecl(); 8400 return; 8401 } 8402 8403 // Success! Record the move. 8404 Statements.push_back(Move.takeAs<Expr>()); 8405 } 8406 8407 // \brief Reference to the __builtin_memcpy function. 8408 Expr *BuiltinMemCpyRef = 0; 8409 // \brief Reference to the __builtin_objc_memmove_collectable function. 8410 Expr *CollectableMemCpyRef = 0; 8411 8412 // Assign non-static members. 8413 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8414 FieldEnd = ClassDecl->field_end(); 8415 Field != FieldEnd; ++Field) { 8416 if (Field->isUnnamedBitfield()) 8417 continue; 8418 8419 // Check for members of reference type; we can't move those. 8420 if (Field->getType()->isReferenceType()) { 8421 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8422 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8423 Diag(Field->getLocation(), diag::note_declared_at); 8424 Diag(CurrentLocation, diag::note_member_synthesized_at) 8425 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8426 Invalid = true; 8427 continue; 8428 } 8429 8430 // Check for members of const-qualified, non-class type. 8431 QualType BaseType = Context.getBaseElementType(Field->getType()); 8432 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8433 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8434 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8435 Diag(Field->getLocation(), diag::note_declared_at); 8436 Diag(CurrentLocation, diag::note_member_synthesized_at) 8437 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8438 Invalid = true; 8439 continue; 8440 } 8441 8442 // Suppress assigning zero-width bitfields. 8443 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8444 continue; 8445 8446 QualType FieldType = Field->getType().getNonReferenceType(); 8447 if (FieldType->isIncompleteArrayType()) { 8448 assert(ClassDecl->hasFlexibleArrayMember() && 8449 "Incomplete array type is not valid"); 8450 continue; 8451 } 8452 8453 // Build references to the field in the object we're copying from and to. 8454 CXXScopeSpec SS; // Intentionally empty 8455 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8456 LookupMemberName); 8457 MemberLookup.addDecl(*Field); 8458 MemberLookup.resolveKind(); 8459 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8460 Loc, /*IsArrow=*/false, 8461 SS, SourceLocation(), 0, 8462 MemberLookup, 0); 8463 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8464 Loc, /*IsArrow=*/true, 8465 SS, SourceLocation(), 0, 8466 MemberLookup, 0); 8467 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8468 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8469 8470 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8471 "Member reference with rvalue base must be rvalue except for reference " 8472 "members, which aren't allowed for move assignment."); 8473 8474 // If the field should be copied with __builtin_memcpy rather than via 8475 // explicit assignments, do so. This optimization only applies for arrays 8476 // of scalars and arrays of class type with trivial move-assignment 8477 // operators. 8478 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8479 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8480 // Compute the size of the memory buffer to be copied. 8481 QualType SizeType = Context.getSizeType(); 8482 llvm::APInt Size(Context.getTypeSize(SizeType), 8483 Context.getTypeSizeInChars(BaseType).getQuantity()); 8484 for (const ConstantArrayType *Array 8485 = Context.getAsConstantArrayType(FieldType); 8486 Array; 8487 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8488 llvm::APInt ArraySize 8489 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8490 Size *= ArraySize; 8491 } 8492 8493 // Take the address of the field references for "from" and "to". We 8494 // directly construct UnaryOperators here because semantic analysis 8495 // does not permit us to take the address of an xvalue. 8496 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8497 Context.getPointerType(From.get()->getType()), 8498 VK_RValue, OK_Ordinary, Loc); 8499 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8500 Context.getPointerType(To.get()->getType()), 8501 VK_RValue, OK_Ordinary, Loc); 8502 8503 bool NeedsCollectableMemCpy = 8504 (BaseType->isRecordType() && 8505 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8506 8507 if (NeedsCollectableMemCpy) { 8508 if (!CollectableMemCpyRef) { 8509 // Create a reference to the __builtin_objc_memmove_collectable function. 8510 LookupResult R(*this, 8511 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8512 Loc, LookupOrdinaryName); 8513 LookupName(R, TUScope, true); 8514 8515 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8516 if (!CollectableMemCpy) { 8517 // Something went horribly wrong earlier, and we will have 8518 // complained about it. 8519 Invalid = true; 8520 continue; 8521 } 8522 8523 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8524 CollectableMemCpy->getType(), 8525 VK_LValue, Loc, 0).take(); 8526 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8527 } 8528 } 8529 // Create a reference to the __builtin_memcpy builtin function. 8530 else if (!BuiltinMemCpyRef) { 8531 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8532 LookupOrdinaryName); 8533 LookupName(R, TUScope, true); 8534 8535 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8536 if (!BuiltinMemCpy) { 8537 // Something went horribly wrong earlier, and we will have complained 8538 // about it. 8539 Invalid = true; 8540 continue; 8541 } 8542 8543 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8544 BuiltinMemCpy->getType(), 8545 VK_LValue, Loc, 0).take(); 8546 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8547 } 8548 8549 ASTOwningVector<Expr*> CallArgs(*this); 8550 CallArgs.push_back(To.takeAs<Expr>()); 8551 CallArgs.push_back(From.takeAs<Expr>()); 8552 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8553 ExprResult Call = ExprError(); 8554 if (NeedsCollectableMemCpy) 8555 Call = ActOnCallExpr(/*Scope=*/0, 8556 CollectableMemCpyRef, 8557 Loc, move_arg(CallArgs), 8558 Loc); 8559 else 8560 Call = ActOnCallExpr(/*Scope=*/0, 8561 BuiltinMemCpyRef, 8562 Loc, move_arg(CallArgs), 8563 Loc); 8564 8565 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8566 Statements.push_back(Call.takeAs<Expr>()); 8567 continue; 8568 } 8569 8570 // Build the move of this field. 8571 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8572 To.get(), From.get(), 8573 /*CopyingBaseSubobject=*/false, 8574 /*Copying=*/false); 8575 if (Move.isInvalid()) { 8576 Diag(CurrentLocation, diag::note_member_synthesized_at) 8577 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8578 MoveAssignOperator->setInvalidDecl(); 8579 return; 8580 } 8581 8582 // Success! Record the copy. 8583 Statements.push_back(Move.takeAs<Stmt>()); 8584 } 8585 8586 if (!Invalid) { 8587 // Add a "return *this;" 8588 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8589 8590 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8591 if (Return.isInvalid()) 8592 Invalid = true; 8593 else { 8594 Statements.push_back(Return.takeAs<Stmt>()); 8595 8596 if (Trap.hasErrorOccurred()) { 8597 Diag(CurrentLocation, diag::note_member_synthesized_at) 8598 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8599 Invalid = true; 8600 } 8601 } 8602 } 8603 8604 if (Invalid) { 8605 MoveAssignOperator->setInvalidDecl(); 8606 return; 8607 } 8608 8609 StmtResult Body; 8610 { 8611 CompoundScopeRAII CompoundScope(*this); 8612 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8613 /*isStmtExpr=*/false); 8614 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8615 } 8616 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8617 8618 if (ASTMutationListener *L = getASTMutationListener()) { 8619 L->CompletedImplicitDefinition(MoveAssignOperator); 8620 } 8621} 8622 8623std::pair<Sema::ImplicitExceptionSpecification, bool> 8624Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8625 if (ClassDecl->isInvalidDecl()) 8626 return std::make_pair(ImplicitExceptionSpecification(*this), false); 8627 8628 // C++ [class.copy]p5: 8629 // The implicitly-declared copy constructor for a class X will 8630 // have the form 8631 // 8632 // X::X(const X&) 8633 // 8634 // if 8635 // FIXME: It ought to be possible to store this on the record. 8636 bool HasConstCopyConstructor = true; 8637 8638 // -- each direct or virtual base class B of X has a copy 8639 // constructor whose first parameter is of type const B& or 8640 // const volatile B&, and 8641 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8642 BaseEnd = ClassDecl->bases_end(); 8643 HasConstCopyConstructor && Base != BaseEnd; 8644 ++Base) { 8645 // Virtual bases are handled below. 8646 if (Base->isVirtual()) 8647 continue; 8648 8649 CXXRecordDecl *BaseClassDecl 8650 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8651 HasConstCopyConstructor &= 8652 (bool)LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const); 8653 } 8654 8655 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8656 BaseEnd = ClassDecl->vbases_end(); 8657 HasConstCopyConstructor && Base != BaseEnd; 8658 ++Base) { 8659 CXXRecordDecl *BaseClassDecl 8660 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8661 HasConstCopyConstructor &= 8662 (bool)LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const); 8663 } 8664 8665 // -- for all the nonstatic data members of X that are of a 8666 // class type M (or array thereof), each such class type 8667 // has a copy constructor whose first parameter is of type 8668 // const M& or const volatile M&. 8669 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8670 FieldEnd = ClassDecl->field_end(); 8671 HasConstCopyConstructor && Field != FieldEnd; 8672 ++Field) { 8673 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8674 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8675 HasConstCopyConstructor &= 8676 (bool)LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const); 8677 } 8678 } 8679 // Otherwise, the implicitly declared copy constructor will have 8680 // the form 8681 // 8682 // X::X(X&) 8683 8684 // C++ [except.spec]p14: 8685 // An implicitly declared special member function (Clause 12) shall have an 8686 // exception-specification. [...] 8687 ImplicitExceptionSpecification ExceptSpec(*this); 8688 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8689 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8690 BaseEnd = ClassDecl->bases_end(); 8691 Base != BaseEnd; 8692 ++Base) { 8693 // Virtual bases are handled below. 8694 if (Base->isVirtual()) 8695 continue; 8696 8697 CXXRecordDecl *BaseClassDecl 8698 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8699 if (CXXConstructorDecl *CopyConstructor = 8700 LookupCopyingConstructor(BaseClassDecl, Quals)) 8701 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8702 } 8703 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8704 BaseEnd = ClassDecl->vbases_end(); 8705 Base != BaseEnd; 8706 ++Base) { 8707 CXXRecordDecl *BaseClassDecl 8708 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8709 if (CXXConstructorDecl *CopyConstructor = 8710 LookupCopyingConstructor(BaseClassDecl, Quals)) 8711 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8712 } 8713 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8714 FieldEnd = ClassDecl->field_end(); 8715 Field != FieldEnd; 8716 ++Field) { 8717 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8718 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8719 if (CXXConstructorDecl *CopyConstructor = 8720 LookupCopyingConstructor(FieldClassDecl, Quals)) 8721 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8722 } 8723 } 8724 8725 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8726} 8727 8728CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8729 CXXRecordDecl *ClassDecl) { 8730 // C++ [class.copy]p4: 8731 // If the class definition does not explicitly declare a copy 8732 // constructor, one is declared implicitly. 8733 8734 ImplicitExceptionSpecification Spec(*this); 8735 bool Const; 8736 llvm::tie(Spec, Const) = 8737 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8738 8739 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8740 QualType ArgType = ClassType; 8741 if (Const) 8742 ArgType = ArgType.withConst(); 8743 ArgType = Context.getLValueReferenceType(ArgType); 8744 8745 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8746 8747 DeclarationName Name 8748 = Context.DeclarationNames.getCXXConstructorName( 8749 Context.getCanonicalType(ClassType)); 8750 SourceLocation ClassLoc = ClassDecl->getLocation(); 8751 DeclarationNameInfo NameInfo(Name, ClassLoc); 8752 8753 // An implicitly-declared copy constructor is an inline public 8754 // member of its class. 8755 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8756 Context, ClassDecl, ClassLoc, NameInfo, 8757 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8758 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8759 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8760 getLangOpts().CPlusPlus0x); 8761 CopyConstructor->setAccess(AS_public); 8762 CopyConstructor->setDefaulted(); 8763 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8764 8765 // Note that we have declared this constructor. 8766 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8767 8768 // Add the parameter to the constructor. 8769 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8770 ClassLoc, ClassLoc, 8771 /*IdentifierInfo=*/0, 8772 ArgType, /*TInfo=*/0, 8773 SC_None, 8774 SC_None, 0); 8775 CopyConstructor->setParams(FromParam); 8776 8777 if (Scope *S = getScopeForContext(ClassDecl)) 8778 PushOnScopeChains(CopyConstructor, S, false); 8779 ClassDecl->addDecl(CopyConstructor); 8780 8781 // C++11 [class.copy]p8: 8782 // ... If the class definition does not explicitly declare a copy 8783 // constructor, there is no user-declared move constructor, and there is no 8784 // user-declared move assignment operator, a copy constructor is implicitly 8785 // declared as defaulted. 8786 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8787 CopyConstructor->setDeletedAsWritten(); 8788 8789 return CopyConstructor; 8790} 8791 8792void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8793 CXXConstructorDecl *CopyConstructor) { 8794 assert((CopyConstructor->isDefaulted() && 8795 CopyConstructor->isCopyConstructor() && 8796 !CopyConstructor->doesThisDeclarationHaveABody() && 8797 !CopyConstructor->isDeleted()) && 8798 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8799 8800 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8801 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8802 8803 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8804 DiagnosticErrorTrap Trap(Diags); 8805 8806 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8807 Trap.hasErrorOccurred()) { 8808 Diag(CurrentLocation, diag::note_member_synthesized_at) 8809 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8810 CopyConstructor->setInvalidDecl(); 8811 } else { 8812 Sema::CompoundScopeRAII CompoundScope(*this); 8813 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8814 CopyConstructor->getLocation(), 8815 MultiStmtArg(*this, 0, 0), 8816 /*isStmtExpr=*/false) 8817 .takeAs<Stmt>()); 8818 CopyConstructor->setImplicitlyDefined(true); 8819 } 8820 8821 CopyConstructor->setUsed(); 8822 if (ASTMutationListener *L = getASTMutationListener()) { 8823 L->CompletedImplicitDefinition(CopyConstructor); 8824 } 8825} 8826 8827Sema::ImplicitExceptionSpecification 8828Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8829 // C++ [except.spec]p14: 8830 // An implicitly declared special member function (Clause 12) shall have an 8831 // exception-specification. [...] 8832 ImplicitExceptionSpecification ExceptSpec(*this); 8833 if (ClassDecl->isInvalidDecl()) 8834 return ExceptSpec; 8835 8836 // Direct base-class constructors. 8837 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8838 BEnd = ClassDecl->bases_end(); 8839 B != BEnd; ++B) { 8840 if (B->isVirtual()) // Handled below. 8841 continue; 8842 8843 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8844 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8845 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8846 // If this is a deleted function, add it anyway. This might be conformant 8847 // with the standard. This might not. I'm not sure. It might not matter. 8848 if (Constructor) 8849 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8850 } 8851 } 8852 8853 // Virtual base-class constructors. 8854 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8855 BEnd = ClassDecl->vbases_end(); 8856 B != BEnd; ++B) { 8857 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8858 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8859 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8860 // If this is a deleted function, add it anyway. This might be conformant 8861 // with the standard. This might not. I'm not sure. It might not matter. 8862 if (Constructor) 8863 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8864 } 8865 } 8866 8867 // Field constructors. 8868 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8869 FEnd = ClassDecl->field_end(); 8870 F != FEnd; ++F) { 8871 if (const RecordType *RecordTy 8872 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8873 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8874 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8875 // If this is a deleted function, add it anyway. This might be conformant 8876 // with the standard. This might not. I'm not sure. It might not matter. 8877 // In particular, the problem is that this function never gets called. It 8878 // might just be ill-formed because this function attempts to refer to 8879 // a deleted function here. 8880 if (Constructor) 8881 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8882 } 8883 } 8884 8885 return ExceptSpec; 8886} 8887 8888CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8889 CXXRecordDecl *ClassDecl) { 8890 // C++11 [class.copy]p9: 8891 // If the definition of a class X does not explicitly declare a move 8892 // constructor, one will be implicitly declared as defaulted if and only if: 8893 // 8894 // - [first 4 bullets] 8895 assert(ClassDecl->needsImplicitMoveConstructor()); 8896 8897 // [Checked after we build the declaration] 8898 // - the move assignment operator would not be implicitly defined as 8899 // deleted, 8900 8901 // [DR1402]: 8902 // - each of X's non-static data members and direct or virtual base classes 8903 // has a type that either has a move constructor or is trivially copyable. 8904 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8905 ClassDecl->setFailedImplicitMoveConstructor(); 8906 return 0; 8907 } 8908 8909 ImplicitExceptionSpecification Spec( 8910 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8911 8912 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8913 QualType ArgType = Context.getRValueReferenceType(ClassType); 8914 8915 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8916 8917 DeclarationName Name 8918 = Context.DeclarationNames.getCXXConstructorName( 8919 Context.getCanonicalType(ClassType)); 8920 SourceLocation ClassLoc = ClassDecl->getLocation(); 8921 DeclarationNameInfo NameInfo(Name, ClassLoc); 8922 8923 // C++0x [class.copy]p11: 8924 // An implicitly-declared copy/move constructor is an inline public 8925 // member of its class. 8926 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8927 Context, ClassDecl, ClassLoc, NameInfo, 8928 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8929 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8930 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8931 getLangOpts().CPlusPlus0x); 8932 MoveConstructor->setAccess(AS_public); 8933 MoveConstructor->setDefaulted(); 8934 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8935 8936 // Add the parameter to the constructor. 8937 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8938 ClassLoc, ClassLoc, 8939 /*IdentifierInfo=*/0, 8940 ArgType, /*TInfo=*/0, 8941 SC_None, 8942 SC_None, 0); 8943 MoveConstructor->setParams(FromParam); 8944 8945 // C++0x [class.copy]p9: 8946 // If the definition of a class X does not explicitly declare a move 8947 // constructor, one will be implicitly declared as defaulted if and only if: 8948 // [...] 8949 // - the move constructor would not be implicitly defined as deleted. 8950 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8951 // Cache this result so that we don't try to generate this over and over 8952 // on every lookup, leaking memory and wasting time. 8953 ClassDecl->setFailedImplicitMoveConstructor(); 8954 return 0; 8955 } 8956 8957 // Note that we have declared this constructor. 8958 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8959 8960 if (Scope *S = getScopeForContext(ClassDecl)) 8961 PushOnScopeChains(MoveConstructor, S, false); 8962 ClassDecl->addDecl(MoveConstructor); 8963 8964 return MoveConstructor; 8965} 8966 8967void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8968 CXXConstructorDecl *MoveConstructor) { 8969 assert((MoveConstructor->isDefaulted() && 8970 MoveConstructor->isMoveConstructor() && 8971 !MoveConstructor->doesThisDeclarationHaveABody() && 8972 !MoveConstructor->isDeleted()) && 8973 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8974 8975 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8976 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8977 8978 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8979 DiagnosticErrorTrap Trap(Diags); 8980 8981 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8982 Trap.hasErrorOccurred()) { 8983 Diag(CurrentLocation, diag::note_member_synthesized_at) 8984 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8985 MoveConstructor->setInvalidDecl(); 8986 } else { 8987 Sema::CompoundScopeRAII CompoundScope(*this); 8988 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8989 MoveConstructor->getLocation(), 8990 MultiStmtArg(*this, 0, 0), 8991 /*isStmtExpr=*/false) 8992 .takeAs<Stmt>()); 8993 MoveConstructor->setImplicitlyDefined(true); 8994 } 8995 8996 MoveConstructor->setUsed(); 8997 8998 if (ASTMutationListener *L = getASTMutationListener()) { 8999 L->CompletedImplicitDefinition(MoveConstructor); 9000 } 9001} 9002 9003bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 9004 return FD->isDeleted() && 9005 (FD->isDefaulted() || FD->isImplicit()) && 9006 isa<CXXMethodDecl>(FD); 9007} 9008 9009/// \brief Mark the call operator of the given lambda closure type as "used". 9010static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 9011 CXXMethodDecl *CallOperator 9012 = cast<CXXMethodDecl>( 9013 *Lambda->lookup( 9014 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 9015 CallOperator->setReferenced(); 9016 CallOperator->setUsed(); 9017} 9018 9019void Sema::DefineImplicitLambdaToFunctionPointerConversion( 9020 SourceLocation CurrentLocation, 9021 CXXConversionDecl *Conv) 9022{ 9023 CXXRecordDecl *Lambda = Conv->getParent(); 9024 9025 // Make sure that the lambda call operator is marked used. 9026 markLambdaCallOperatorUsed(*this, Lambda); 9027 9028 Conv->setUsed(); 9029 9030 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 9031 DiagnosticErrorTrap Trap(Diags); 9032 9033 // Return the address of the __invoke function. 9034 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 9035 CXXMethodDecl *Invoke 9036 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 9037 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 9038 VK_LValue, Conv->getLocation()).take(); 9039 assert(FunctionRef && "Can't refer to __invoke function?"); 9040 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 9041 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 9042 Conv->getLocation(), 9043 Conv->getLocation())); 9044 9045 // Fill in the __invoke function with a dummy implementation. IR generation 9046 // will fill in the actual details. 9047 Invoke->setUsed(); 9048 Invoke->setReferenced(); 9049 Invoke->setBody(new (Context) CompoundStmt(Context, 0, 0, Conv->getLocation(), 9050 Conv->getLocation())); 9051 9052 if (ASTMutationListener *L = getASTMutationListener()) { 9053 L->CompletedImplicitDefinition(Conv); 9054 L->CompletedImplicitDefinition(Invoke); 9055 } 9056} 9057 9058void Sema::DefineImplicitLambdaToBlockPointerConversion( 9059 SourceLocation CurrentLocation, 9060 CXXConversionDecl *Conv) 9061{ 9062 Conv->setUsed(); 9063 9064 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 9065 DiagnosticErrorTrap Trap(Diags); 9066 9067 // Copy-initialize the lambda object as needed to capture it. 9068 Expr *This = ActOnCXXThis(CurrentLocation).take(); 9069 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 9070 9071 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 9072 Conv->getLocation(), 9073 Conv, DerefThis); 9074 9075 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 9076 // behavior. Note that only the general conversion function does this 9077 // (since it's unusable otherwise); in the case where we inline the 9078 // block literal, it has block literal lifetime semantics. 9079 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 9080 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 9081 CK_CopyAndAutoreleaseBlockObject, 9082 BuildBlock.get(), 0, VK_RValue); 9083 9084 if (BuildBlock.isInvalid()) { 9085 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9086 Conv->setInvalidDecl(); 9087 return; 9088 } 9089 9090 // Create the return statement that returns the block from the conversion 9091 // function. 9092 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9093 if (Return.isInvalid()) { 9094 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9095 Conv->setInvalidDecl(); 9096 return; 9097 } 9098 9099 // Set the body of the conversion function. 9100 Stmt *ReturnS = Return.take(); 9101 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 9102 Conv->getLocation(), 9103 Conv->getLocation())); 9104 9105 // We're done; notify the mutation listener, if any. 9106 if (ASTMutationListener *L = getASTMutationListener()) { 9107 L->CompletedImplicitDefinition(Conv); 9108 } 9109} 9110 9111/// \brief Determine whether the given list arguments contains exactly one 9112/// "real" (non-default) argument. 9113static bool hasOneRealArgument(MultiExprArg Args) { 9114 switch (Args.size()) { 9115 case 0: 9116 return false; 9117 9118 default: 9119 if (!Args.get()[1]->isDefaultArgument()) 9120 return false; 9121 9122 // fall through 9123 case 1: 9124 return !Args.get()[0]->isDefaultArgument(); 9125 } 9126 9127 return false; 9128} 9129 9130ExprResult 9131Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9132 CXXConstructorDecl *Constructor, 9133 MultiExprArg ExprArgs, 9134 bool HadMultipleCandidates, 9135 bool RequiresZeroInit, 9136 unsigned ConstructKind, 9137 SourceRange ParenRange) { 9138 bool Elidable = false; 9139 9140 // C++0x [class.copy]p34: 9141 // When certain criteria are met, an implementation is allowed to 9142 // omit the copy/move construction of a class object, even if the 9143 // copy/move constructor and/or destructor for the object have 9144 // side effects. [...] 9145 // - when a temporary class object that has not been bound to a 9146 // reference (12.2) would be copied/moved to a class object 9147 // with the same cv-unqualified type, the copy/move operation 9148 // can be omitted by constructing the temporary object 9149 // directly into the target of the omitted copy/move 9150 if (ConstructKind == CXXConstructExpr::CK_Complete && 9151 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9152 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 9153 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9154 } 9155 9156 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9157 Elidable, move(ExprArgs), HadMultipleCandidates, 9158 RequiresZeroInit, ConstructKind, ParenRange); 9159} 9160 9161/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9162/// including handling of its default argument expressions. 9163ExprResult 9164Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9165 CXXConstructorDecl *Constructor, bool Elidable, 9166 MultiExprArg ExprArgs, 9167 bool HadMultipleCandidates, 9168 bool RequiresZeroInit, 9169 unsigned ConstructKind, 9170 SourceRange ParenRange) { 9171 unsigned NumExprs = ExprArgs.size(); 9172 Expr **Exprs = (Expr **)ExprArgs.release(); 9173 9174 for (specific_attr_iterator<NonNullAttr> 9175 i = Constructor->specific_attr_begin<NonNullAttr>(), 9176 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 9177 const NonNullAttr *NonNull = *i; 9178 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 9179 } 9180 9181 MarkFunctionReferenced(ConstructLoc, Constructor); 9182 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9183 Constructor, Elidable, Exprs, NumExprs, 9184 HadMultipleCandidates, /*FIXME*/false, 9185 RequiresZeroInit, 9186 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9187 ParenRange)); 9188} 9189 9190bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9191 CXXConstructorDecl *Constructor, 9192 MultiExprArg Exprs, 9193 bool HadMultipleCandidates) { 9194 // FIXME: Provide the correct paren SourceRange when available. 9195 ExprResult TempResult = 9196 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9197 move(Exprs), HadMultipleCandidates, false, 9198 CXXConstructExpr::CK_Complete, SourceRange()); 9199 if (TempResult.isInvalid()) 9200 return true; 9201 9202 Expr *Temp = TempResult.takeAs<Expr>(); 9203 CheckImplicitConversions(Temp, VD->getLocation()); 9204 MarkFunctionReferenced(VD->getLocation(), Constructor); 9205 Temp = MaybeCreateExprWithCleanups(Temp); 9206 VD->setInit(Temp); 9207 9208 return false; 9209} 9210 9211void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9212 if (VD->isInvalidDecl()) return; 9213 9214 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9215 if (ClassDecl->isInvalidDecl()) return; 9216 if (ClassDecl->hasIrrelevantDestructor()) return; 9217 if (ClassDecl->isDependentContext()) return; 9218 9219 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9220 MarkFunctionReferenced(VD->getLocation(), Destructor); 9221 CheckDestructorAccess(VD->getLocation(), Destructor, 9222 PDiag(diag::err_access_dtor_var) 9223 << VD->getDeclName() 9224 << VD->getType()); 9225 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9226 9227 if (!VD->hasGlobalStorage()) return; 9228 9229 // Emit warning for non-trivial dtor in global scope (a real global, 9230 // class-static, function-static). 9231 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9232 9233 // TODO: this should be re-enabled for static locals by !CXAAtExit 9234 if (!VD->isStaticLocal()) 9235 Diag(VD->getLocation(), diag::warn_global_destructor); 9236} 9237 9238/// \brief Given a constructor and the set of arguments provided for the 9239/// constructor, convert the arguments and add any required default arguments 9240/// to form a proper call to this constructor. 9241/// 9242/// \returns true if an error occurred, false otherwise. 9243bool 9244Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9245 MultiExprArg ArgsPtr, 9246 SourceLocation Loc, 9247 ASTOwningVector<Expr*> &ConvertedArgs, 9248 bool AllowExplicit) { 9249 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9250 unsigned NumArgs = ArgsPtr.size(); 9251 Expr **Args = (Expr **)ArgsPtr.get(); 9252 9253 const FunctionProtoType *Proto 9254 = Constructor->getType()->getAs<FunctionProtoType>(); 9255 assert(Proto && "Constructor without a prototype?"); 9256 unsigned NumArgsInProto = Proto->getNumArgs(); 9257 9258 // If too few arguments are available, we'll fill in the rest with defaults. 9259 if (NumArgs < NumArgsInProto) 9260 ConvertedArgs.reserve(NumArgsInProto); 9261 else 9262 ConvertedArgs.reserve(NumArgs); 9263 9264 VariadicCallType CallType = 9265 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9266 SmallVector<Expr *, 8> AllArgs; 9267 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9268 Proto, 0, Args, NumArgs, AllArgs, 9269 CallType, AllowExplicit); 9270 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9271 9272 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9273 9274 // FIXME: Missing call to CheckFunctionCall or equivalent 9275 9276 return Invalid; 9277} 9278 9279static inline bool 9280CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9281 const FunctionDecl *FnDecl) { 9282 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9283 if (isa<NamespaceDecl>(DC)) { 9284 return SemaRef.Diag(FnDecl->getLocation(), 9285 diag::err_operator_new_delete_declared_in_namespace) 9286 << FnDecl->getDeclName(); 9287 } 9288 9289 if (isa<TranslationUnitDecl>(DC) && 9290 FnDecl->getStorageClass() == SC_Static) { 9291 return SemaRef.Diag(FnDecl->getLocation(), 9292 diag::err_operator_new_delete_declared_static) 9293 << FnDecl->getDeclName(); 9294 } 9295 9296 return false; 9297} 9298 9299static inline bool 9300CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9301 CanQualType ExpectedResultType, 9302 CanQualType ExpectedFirstParamType, 9303 unsigned DependentParamTypeDiag, 9304 unsigned InvalidParamTypeDiag) { 9305 QualType ResultType = 9306 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9307 9308 // Check that the result type is not dependent. 9309 if (ResultType->isDependentType()) 9310 return SemaRef.Diag(FnDecl->getLocation(), 9311 diag::err_operator_new_delete_dependent_result_type) 9312 << FnDecl->getDeclName() << ExpectedResultType; 9313 9314 // Check that the result type is what we expect. 9315 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9316 return SemaRef.Diag(FnDecl->getLocation(), 9317 diag::err_operator_new_delete_invalid_result_type) 9318 << FnDecl->getDeclName() << ExpectedResultType; 9319 9320 // A function template must have at least 2 parameters. 9321 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9322 return SemaRef.Diag(FnDecl->getLocation(), 9323 diag::err_operator_new_delete_template_too_few_parameters) 9324 << FnDecl->getDeclName(); 9325 9326 // The function decl must have at least 1 parameter. 9327 if (FnDecl->getNumParams() == 0) 9328 return SemaRef.Diag(FnDecl->getLocation(), 9329 diag::err_operator_new_delete_too_few_parameters) 9330 << FnDecl->getDeclName(); 9331 9332 // Check the the first parameter type is not dependent. 9333 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9334 if (FirstParamType->isDependentType()) 9335 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9336 << FnDecl->getDeclName() << ExpectedFirstParamType; 9337 9338 // Check that the first parameter type is what we expect. 9339 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9340 ExpectedFirstParamType) 9341 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9342 << FnDecl->getDeclName() << ExpectedFirstParamType; 9343 9344 return false; 9345} 9346 9347static bool 9348CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9349 // C++ [basic.stc.dynamic.allocation]p1: 9350 // A program is ill-formed if an allocation function is declared in a 9351 // namespace scope other than global scope or declared static in global 9352 // scope. 9353 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9354 return true; 9355 9356 CanQualType SizeTy = 9357 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9358 9359 // C++ [basic.stc.dynamic.allocation]p1: 9360 // The return type shall be void*. The first parameter shall have type 9361 // std::size_t. 9362 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9363 SizeTy, 9364 diag::err_operator_new_dependent_param_type, 9365 diag::err_operator_new_param_type)) 9366 return true; 9367 9368 // C++ [basic.stc.dynamic.allocation]p1: 9369 // The first parameter shall not have an associated default argument. 9370 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9371 return SemaRef.Diag(FnDecl->getLocation(), 9372 diag::err_operator_new_default_arg) 9373 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9374 9375 return false; 9376} 9377 9378static bool 9379CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9380 // C++ [basic.stc.dynamic.deallocation]p1: 9381 // A program is ill-formed if deallocation functions are declared in a 9382 // namespace scope other than global scope or declared static in global 9383 // scope. 9384 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9385 return true; 9386 9387 // C++ [basic.stc.dynamic.deallocation]p2: 9388 // Each deallocation function shall return void and its first parameter 9389 // shall be void*. 9390 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9391 SemaRef.Context.VoidPtrTy, 9392 diag::err_operator_delete_dependent_param_type, 9393 diag::err_operator_delete_param_type)) 9394 return true; 9395 9396 return false; 9397} 9398 9399/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9400/// of this overloaded operator is well-formed. If so, returns false; 9401/// otherwise, emits appropriate diagnostics and returns true. 9402bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9403 assert(FnDecl && FnDecl->isOverloadedOperator() && 9404 "Expected an overloaded operator declaration"); 9405 9406 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9407 9408 // C++ [over.oper]p5: 9409 // The allocation and deallocation functions, operator new, 9410 // operator new[], operator delete and operator delete[], are 9411 // described completely in 3.7.3. The attributes and restrictions 9412 // found in the rest of this subclause do not apply to them unless 9413 // explicitly stated in 3.7.3. 9414 if (Op == OO_Delete || Op == OO_Array_Delete) 9415 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9416 9417 if (Op == OO_New || Op == OO_Array_New) 9418 return CheckOperatorNewDeclaration(*this, FnDecl); 9419 9420 // C++ [over.oper]p6: 9421 // An operator function shall either be a non-static member 9422 // function or be a non-member function and have at least one 9423 // parameter whose type is a class, a reference to a class, an 9424 // enumeration, or a reference to an enumeration. 9425 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9426 if (MethodDecl->isStatic()) 9427 return Diag(FnDecl->getLocation(), 9428 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9429 } else { 9430 bool ClassOrEnumParam = false; 9431 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9432 ParamEnd = FnDecl->param_end(); 9433 Param != ParamEnd; ++Param) { 9434 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9435 if (ParamType->isDependentType() || ParamType->isRecordType() || 9436 ParamType->isEnumeralType()) { 9437 ClassOrEnumParam = true; 9438 break; 9439 } 9440 } 9441 9442 if (!ClassOrEnumParam) 9443 return Diag(FnDecl->getLocation(), 9444 diag::err_operator_overload_needs_class_or_enum) 9445 << FnDecl->getDeclName(); 9446 } 9447 9448 // C++ [over.oper]p8: 9449 // An operator function cannot have default arguments (8.3.6), 9450 // except where explicitly stated below. 9451 // 9452 // Only the function-call operator allows default arguments 9453 // (C++ [over.call]p1). 9454 if (Op != OO_Call) { 9455 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9456 Param != FnDecl->param_end(); ++Param) { 9457 if ((*Param)->hasDefaultArg()) 9458 return Diag((*Param)->getLocation(), 9459 diag::err_operator_overload_default_arg) 9460 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9461 } 9462 } 9463 9464 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9465 { false, false, false } 9466#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9467 , { Unary, Binary, MemberOnly } 9468#include "clang/Basic/OperatorKinds.def" 9469 }; 9470 9471 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9472 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9473 bool MustBeMemberOperator = OperatorUses[Op][2]; 9474 9475 // C++ [over.oper]p8: 9476 // [...] Operator functions cannot have more or fewer parameters 9477 // than the number required for the corresponding operator, as 9478 // described in the rest of this subclause. 9479 unsigned NumParams = FnDecl->getNumParams() 9480 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9481 if (Op != OO_Call && 9482 ((NumParams == 1 && !CanBeUnaryOperator) || 9483 (NumParams == 2 && !CanBeBinaryOperator) || 9484 (NumParams < 1) || (NumParams > 2))) { 9485 // We have the wrong number of parameters. 9486 unsigned ErrorKind; 9487 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9488 ErrorKind = 2; // 2 -> unary or binary. 9489 } else if (CanBeUnaryOperator) { 9490 ErrorKind = 0; // 0 -> unary 9491 } else { 9492 assert(CanBeBinaryOperator && 9493 "All non-call overloaded operators are unary or binary!"); 9494 ErrorKind = 1; // 1 -> binary 9495 } 9496 9497 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9498 << FnDecl->getDeclName() << NumParams << ErrorKind; 9499 } 9500 9501 // Overloaded operators other than operator() cannot be variadic. 9502 if (Op != OO_Call && 9503 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9504 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9505 << FnDecl->getDeclName(); 9506 } 9507 9508 // Some operators must be non-static member functions. 9509 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9510 return Diag(FnDecl->getLocation(), 9511 diag::err_operator_overload_must_be_member) 9512 << FnDecl->getDeclName(); 9513 } 9514 9515 // C++ [over.inc]p1: 9516 // The user-defined function called operator++ implements the 9517 // prefix and postfix ++ operator. If this function is a member 9518 // function with no parameters, or a non-member function with one 9519 // parameter of class or enumeration type, it defines the prefix 9520 // increment operator ++ for objects of that type. If the function 9521 // is a member function with one parameter (which shall be of type 9522 // int) or a non-member function with two parameters (the second 9523 // of which shall be of type int), it defines the postfix 9524 // increment operator ++ for objects of that type. 9525 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9526 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9527 bool ParamIsInt = false; 9528 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9529 ParamIsInt = BT->getKind() == BuiltinType::Int; 9530 9531 if (!ParamIsInt) 9532 return Diag(LastParam->getLocation(), 9533 diag::err_operator_overload_post_incdec_must_be_int) 9534 << LastParam->getType() << (Op == OO_MinusMinus); 9535 } 9536 9537 return false; 9538} 9539 9540/// CheckLiteralOperatorDeclaration - Check whether the declaration 9541/// of this literal operator function is well-formed. If so, returns 9542/// false; otherwise, emits appropriate diagnostics and returns true. 9543bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9544 if (isa<CXXMethodDecl>(FnDecl)) { 9545 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9546 << FnDecl->getDeclName(); 9547 return true; 9548 } 9549 9550 if (FnDecl->isExternC()) { 9551 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9552 return true; 9553 } 9554 9555 bool Valid = false; 9556 9557 // This might be the definition of a literal operator template. 9558 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9559 // This might be a specialization of a literal operator template. 9560 if (!TpDecl) 9561 TpDecl = FnDecl->getPrimaryTemplate(); 9562 9563 // template <char...> type operator "" name() is the only valid template 9564 // signature, and the only valid signature with no parameters. 9565 if (TpDecl) { 9566 if (FnDecl->param_size() == 0) { 9567 // Must have only one template parameter 9568 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9569 if (Params->size() == 1) { 9570 NonTypeTemplateParmDecl *PmDecl = 9571 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9572 9573 // The template parameter must be a char parameter pack. 9574 if (PmDecl && PmDecl->isTemplateParameterPack() && 9575 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9576 Valid = true; 9577 } 9578 } 9579 } else if (FnDecl->param_size()) { 9580 // Check the first parameter 9581 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9582 9583 QualType T = (*Param)->getType().getUnqualifiedType(); 9584 9585 // unsigned long long int, long double, and any character type are allowed 9586 // as the only parameters. 9587 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9588 Context.hasSameType(T, Context.LongDoubleTy) || 9589 Context.hasSameType(T, Context.CharTy) || 9590 Context.hasSameType(T, Context.WCharTy) || 9591 Context.hasSameType(T, Context.Char16Ty) || 9592 Context.hasSameType(T, Context.Char32Ty)) { 9593 if (++Param == FnDecl->param_end()) 9594 Valid = true; 9595 goto FinishedParams; 9596 } 9597 9598 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9599 const PointerType *PT = T->getAs<PointerType>(); 9600 if (!PT) 9601 goto FinishedParams; 9602 T = PT->getPointeeType(); 9603 if (!T.isConstQualified() || T.isVolatileQualified()) 9604 goto FinishedParams; 9605 T = T.getUnqualifiedType(); 9606 9607 // Move on to the second parameter; 9608 ++Param; 9609 9610 // If there is no second parameter, the first must be a const char * 9611 if (Param == FnDecl->param_end()) { 9612 if (Context.hasSameType(T, Context.CharTy)) 9613 Valid = true; 9614 goto FinishedParams; 9615 } 9616 9617 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9618 // are allowed as the first parameter to a two-parameter function 9619 if (!(Context.hasSameType(T, Context.CharTy) || 9620 Context.hasSameType(T, Context.WCharTy) || 9621 Context.hasSameType(T, Context.Char16Ty) || 9622 Context.hasSameType(T, Context.Char32Ty))) 9623 goto FinishedParams; 9624 9625 // The second and final parameter must be an std::size_t 9626 T = (*Param)->getType().getUnqualifiedType(); 9627 if (Context.hasSameType(T, Context.getSizeType()) && 9628 ++Param == FnDecl->param_end()) 9629 Valid = true; 9630 } 9631 9632 // FIXME: This diagnostic is absolutely terrible. 9633FinishedParams: 9634 if (!Valid) { 9635 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9636 << FnDecl->getDeclName(); 9637 return true; 9638 } 9639 9640 // A parameter-declaration-clause containing a default argument is not 9641 // equivalent to any of the permitted forms. 9642 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9643 ParamEnd = FnDecl->param_end(); 9644 Param != ParamEnd; ++Param) { 9645 if ((*Param)->hasDefaultArg()) { 9646 Diag((*Param)->getDefaultArgRange().getBegin(), 9647 diag::err_literal_operator_default_argument) 9648 << (*Param)->getDefaultArgRange(); 9649 break; 9650 } 9651 } 9652 9653 StringRef LiteralName 9654 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9655 if (LiteralName[0] != '_') { 9656 // C++11 [usrlit.suffix]p1: 9657 // Literal suffix identifiers that do not start with an underscore 9658 // are reserved for future standardization. 9659 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9660 } 9661 9662 return false; 9663} 9664 9665/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9666/// linkage specification, including the language and (if present) 9667/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9668/// the location of the language string literal, which is provided 9669/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9670/// the '{' brace. Otherwise, this linkage specification does not 9671/// have any braces. 9672Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9673 SourceLocation LangLoc, 9674 StringRef Lang, 9675 SourceLocation LBraceLoc) { 9676 LinkageSpecDecl::LanguageIDs Language; 9677 if (Lang == "\"C\"") 9678 Language = LinkageSpecDecl::lang_c; 9679 else if (Lang == "\"C++\"") 9680 Language = LinkageSpecDecl::lang_cxx; 9681 else { 9682 Diag(LangLoc, diag::err_bad_language); 9683 return 0; 9684 } 9685 9686 // FIXME: Add all the various semantics of linkage specifications 9687 9688 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9689 ExternLoc, LangLoc, Language); 9690 CurContext->addDecl(D); 9691 PushDeclContext(S, D); 9692 return D; 9693} 9694 9695/// ActOnFinishLinkageSpecification - Complete the definition of 9696/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9697/// valid, it's the position of the closing '}' brace in a linkage 9698/// specification that uses braces. 9699Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9700 Decl *LinkageSpec, 9701 SourceLocation RBraceLoc) { 9702 if (LinkageSpec) { 9703 if (RBraceLoc.isValid()) { 9704 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9705 LSDecl->setRBraceLoc(RBraceLoc); 9706 } 9707 PopDeclContext(); 9708 } 9709 return LinkageSpec; 9710} 9711 9712/// \brief Perform semantic analysis for the variable declaration that 9713/// occurs within a C++ catch clause, returning the newly-created 9714/// variable. 9715VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9716 TypeSourceInfo *TInfo, 9717 SourceLocation StartLoc, 9718 SourceLocation Loc, 9719 IdentifierInfo *Name) { 9720 bool Invalid = false; 9721 QualType ExDeclType = TInfo->getType(); 9722 9723 // Arrays and functions decay. 9724 if (ExDeclType->isArrayType()) 9725 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9726 else if (ExDeclType->isFunctionType()) 9727 ExDeclType = Context.getPointerType(ExDeclType); 9728 9729 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9730 // The exception-declaration shall not denote a pointer or reference to an 9731 // incomplete type, other than [cv] void*. 9732 // N2844 forbids rvalue references. 9733 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9734 Diag(Loc, diag::err_catch_rvalue_ref); 9735 Invalid = true; 9736 } 9737 9738 QualType BaseType = ExDeclType; 9739 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9740 unsigned DK = diag::err_catch_incomplete; 9741 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9742 BaseType = Ptr->getPointeeType(); 9743 Mode = 1; 9744 DK = diag::err_catch_incomplete_ptr; 9745 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9746 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9747 BaseType = Ref->getPointeeType(); 9748 Mode = 2; 9749 DK = diag::err_catch_incomplete_ref; 9750 } 9751 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9752 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9753 Invalid = true; 9754 9755 if (!Invalid && !ExDeclType->isDependentType() && 9756 RequireNonAbstractType(Loc, ExDeclType, 9757 diag::err_abstract_type_in_decl, 9758 AbstractVariableType)) 9759 Invalid = true; 9760 9761 // Only the non-fragile NeXT runtime currently supports C++ catches 9762 // of ObjC types, and no runtime supports catching ObjC types by value. 9763 if (!Invalid && getLangOpts().ObjC1) { 9764 QualType T = ExDeclType; 9765 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9766 T = RT->getPointeeType(); 9767 9768 if (T->isObjCObjectType()) { 9769 Diag(Loc, diag::err_objc_object_catch); 9770 Invalid = true; 9771 } else if (T->isObjCObjectPointerType()) { 9772 if (!getLangOpts().ObjCNonFragileABI) 9773 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9774 } 9775 } 9776 9777 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9778 ExDeclType, TInfo, SC_None, SC_None); 9779 ExDecl->setExceptionVariable(true); 9780 9781 // In ARC, infer 'retaining' for variables of retainable type. 9782 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9783 Invalid = true; 9784 9785 if (!Invalid && !ExDeclType->isDependentType()) { 9786 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9787 // C++ [except.handle]p16: 9788 // The object declared in an exception-declaration or, if the 9789 // exception-declaration does not specify a name, a temporary (12.2) is 9790 // copy-initialized (8.5) from the exception object. [...] 9791 // The object is destroyed when the handler exits, after the destruction 9792 // of any automatic objects initialized within the handler. 9793 // 9794 // We just pretend to initialize the object with itself, then make sure 9795 // it can be destroyed later. 9796 QualType initType = ExDeclType; 9797 9798 InitializedEntity entity = 9799 InitializedEntity::InitializeVariable(ExDecl); 9800 InitializationKind initKind = 9801 InitializationKind::CreateCopy(Loc, SourceLocation()); 9802 9803 Expr *opaqueValue = 9804 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9805 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9806 ExprResult result = sequence.Perform(*this, entity, initKind, 9807 MultiExprArg(&opaqueValue, 1)); 9808 if (result.isInvalid()) 9809 Invalid = true; 9810 else { 9811 // If the constructor used was non-trivial, set this as the 9812 // "initializer". 9813 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9814 if (!construct->getConstructor()->isTrivial()) { 9815 Expr *init = MaybeCreateExprWithCleanups(construct); 9816 ExDecl->setInit(init); 9817 } 9818 9819 // And make sure it's destructable. 9820 FinalizeVarWithDestructor(ExDecl, recordType); 9821 } 9822 } 9823 } 9824 9825 if (Invalid) 9826 ExDecl->setInvalidDecl(); 9827 9828 return ExDecl; 9829} 9830 9831/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9832/// handler. 9833Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9834 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9835 bool Invalid = D.isInvalidType(); 9836 9837 // Check for unexpanded parameter packs. 9838 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9839 UPPC_ExceptionType)) { 9840 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9841 D.getIdentifierLoc()); 9842 Invalid = true; 9843 } 9844 9845 IdentifierInfo *II = D.getIdentifier(); 9846 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9847 LookupOrdinaryName, 9848 ForRedeclaration)) { 9849 // The scope should be freshly made just for us. There is just no way 9850 // it contains any previous declaration. 9851 assert(!S->isDeclScope(PrevDecl)); 9852 if (PrevDecl->isTemplateParameter()) { 9853 // Maybe we will complain about the shadowed template parameter. 9854 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9855 PrevDecl = 0; 9856 } 9857 } 9858 9859 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9860 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9861 << D.getCXXScopeSpec().getRange(); 9862 Invalid = true; 9863 } 9864 9865 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9866 D.getLocStart(), 9867 D.getIdentifierLoc(), 9868 D.getIdentifier()); 9869 if (Invalid) 9870 ExDecl->setInvalidDecl(); 9871 9872 // Add the exception declaration into this scope. 9873 if (II) 9874 PushOnScopeChains(ExDecl, S); 9875 else 9876 CurContext->addDecl(ExDecl); 9877 9878 ProcessDeclAttributes(S, ExDecl, D); 9879 return ExDecl; 9880} 9881 9882Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9883 Expr *AssertExpr, 9884 Expr *AssertMessageExpr_, 9885 SourceLocation RParenLoc) { 9886 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9887 9888 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9889 // In a static_assert-declaration, the constant-expression shall be a 9890 // constant expression that can be contextually converted to bool. 9891 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9892 if (Converted.isInvalid()) 9893 return 0; 9894 9895 llvm::APSInt Cond; 9896 if (VerifyIntegerConstantExpression(Converted.get(), &Cond, 9897 PDiag(diag::err_static_assert_expression_is_not_constant), 9898 /*AllowFold=*/false).isInvalid()) 9899 return 0; 9900 9901 if (!Cond) { 9902 llvm::SmallString<256> MsgBuffer; 9903 llvm::raw_svector_ostream Msg(MsgBuffer); 9904 AssertMessage->printPretty(Msg, Context, 0, getPrintingPolicy()); 9905 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9906 << Msg.str() << AssertExpr->getSourceRange(); 9907 } 9908 } 9909 9910 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9911 return 0; 9912 9913 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9914 AssertExpr, AssertMessage, RParenLoc); 9915 9916 CurContext->addDecl(Decl); 9917 return Decl; 9918} 9919 9920/// \brief Perform semantic analysis of the given friend type declaration. 9921/// 9922/// \returns A friend declaration that. 9923FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9924 SourceLocation FriendLoc, 9925 TypeSourceInfo *TSInfo) { 9926 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9927 9928 QualType T = TSInfo->getType(); 9929 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9930 9931 // C++03 [class.friend]p2: 9932 // An elaborated-type-specifier shall be used in a friend declaration 9933 // for a class.* 9934 // 9935 // * The class-key of the elaborated-type-specifier is required. 9936 if (!ActiveTemplateInstantiations.empty()) { 9937 // Do not complain about the form of friend template types during 9938 // template instantiation; we will already have complained when the 9939 // template was declared. 9940 } else if (!T->isElaboratedTypeSpecifier()) { 9941 // If we evaluated the type to a record type, suggest putting 9942 // a tag in front. 9943 if (const RecordType *RT = T->getAs<RecordType>()) { 9944 RecordDecl *RD = RT->getDecl(); 9945 9946 std::string InsertionText = std::string(" ") + RD->getKindName(); 9947 9948 Diag(TypeRange.getBegin(), 9949 getLangOpts().CPlusPlus0x ? 9950 diag::warn_cxx98_compat_unelaborated_friend_type : 9951 diag::ext_unelaborated_friend_type) 9952 << (unsigned) RD->getTagKind() 9953 << T 9954 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9955 InsertionText); 9956 } else { 9957 Diag(FriendLoc, 9958 getLangOpts().CPlusPlus0x ? 9959 diag::warn_cxx98_compat_nonclass_type_friend : 9960 diag::ext_nonclass_type_friend) 9961 << T 9962 << SourceRange(FriendLoc, TypeRange.getEnd()); 9963 } 9964 } else if (T->getAs<EnumType>()) { 9965 Diag(FriendLoc, 9966 getLangOpts().CPlusPlus0x ? 9967 diag::warn_cxx98_compat_enum_friend : 9968 diag::ext_enum_friend) 9969 << T 9970 << SourceRange(FriendLoc, TypeRange.getEnd()); 9971 } 9972 9973 // C++0x [class.friend]p3: 9974 // If the type specifier in a friend declaration designates a (possibly 9975 // cv-qualified) class type, that class is declared as a friend; otherwise, 9976 // the friend declaration is ignored. 9977 9978 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9979 // in [class.friend]p3 that we do not implement. 9980 9981 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9982} 9983 9984/// Handle a friend tag declaration where the scope specifier was 9985/// templated. 9986Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9987 unsigned TagSpec, SourceLocation TagLoc, 9988 CXXScopeSpec &SS, 9989 IdentifierInfo *Name, SourceLocation NameLoc, 9990 AttributeList *Attr, 9991 MultiTemplateParamsArg TempParamLists) { 9992 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9993 9994 bool isExplicitSpecialization = false; 9995 bool Invalid = false; 9996 9997 if (TemplateParameterList *TemplateParams 9998 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9999 TempParamLists.get(), 10000 TempParamLists.size(), 10001 /*friend*/ true, 10002 isExplicitSpecialization, 10003 Invalid)) { 10004 if (TemplateParams->size() > 0) { 10005 // This is a declaration of a class template. 10006 if (Invalid) 10007 return 0; 10008 10009 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 10010 SS, Name, NameLoc, Attr, 10011 TemplateParams, AS_public, 10012 /*ModulePrivateLoc=*/SourceLocation(), 10013 TempParamLists.size() - 1, 10014 (TemplateParameterList**) TempParamLists.release()).take(); 10015 } else { 10016 // The "template<>" header is extraneous. 10017 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 10018 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 10019 isExplicitSpecialization = true; 10020 } 10021 } 10022 10023 if (Invalid) return 0; 10024 10025 bool isAllExplicitSpecializations = true; 10026 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 10027 if (TempParamLists.get()[I]->size()) { 10028 isAllExplicitSpecializations = false; 10029 break; 10030 } 10031 } 10032 10033 // FIXME: don't ignore attributes. 10034 10035 // If it's explicit specializations all the way down, just forget 10036 // about the template header and build an appropriate non-templated 10037 // friend. TODO: for source fidelity, remember the headers. 10038 if (isAllExplicitSpecializations) { 10039 if (SS.isEmpty()) { 10040 bool Owned = false; 10041 bool IsDependent = false; 10042 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 10043 Attr, AS_public, 10044 /*ModulePrivateLoc=*/SourceLocation(), 10045 MultiTemplateParamsArg(), Owned, IsDependent, 10046 /*ScopedEnumKWLoc=*/SourceLocation(), 10047 /*ScopedEnumUsesClassTag=*/false, 10048 /*UnderlyingType=*/TypeResult()); 10049 } 10050 10051 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10052 ElaboratedTypeKeyword Keyword 10053 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10054 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10055 *Name, NameLoc); 10056 if (T.isNull()) 10057 return 0; 10058 10059 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10060 if (isa<DependentNameType>(T)) { 10061 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10062 TL.setElaboratedKeywordLoc(TagLoc); 10063 TL.setQualifierLoc(QualifierLoc); 10064 TL.setNameLoc(NameLoc); 10065 } else { 10066 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 10067 TL.setElaboratedKeywordLoc(TagLoc); 10068 TL.setQualifierLoc(QualifierLoc); 10069 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 10070 } 10071 10072 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10073 TSI, FriendLoc); 10074 Friend->setAccess(AS_public); 10075 CurContext->addDecl(Friend); 10076 return Friend; 10077 } 10078 10079 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10080 10081 10082 10083 // Handle the case of a templated-scope friend class. e.g. 10084 // template <class T> class A<T>::B; 10085 // FIXME: we don't support these right now. 10086 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10087 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10088 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10089 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10090 TL.setElaboratedKeywordLoc(TagLoc); 10091 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10092 TL.setNameLoc(NameLoc); 10093 10094 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10095 TSI, FriendLoc); 10096 Friend->setAccess(AS_public); 10097 Friend->setUnsupportedFriend(true); 10098 CurContext->addDecl(Friend); 10099 return Friend; 10100} 10101 10102 10103/// Handle a friend type declaration. This works in tandem with 10104/// ActOnTag. 10105/// 10106/// Notes on friend class templates: 10107/// 10108/// We generally treat friend class declarations as if they were 10109/// declaring a class. So, for example, the elaborated type specifier 10110/// in a friend declaration is required to obey the restrictions of a 10111/// class-head (i.e. no typedefs in the scope chain), template 10112/// parameters are required to match up with simple template-ids, &c. 10113/// However, unlike when declaring a template specialization, it's 10114/// okay to refer to a template specialization without an empty 10115/// template parameter declaration, e.g. 10116/// friend class A<T>::B<unsigned>; 10117/// We permit this as a special case; if there are any template 10118/// parameters present at all, require proper matching, i.e. 10119/// template <> template <class T> friend class A<int>::B; 10120Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10121 MultiTemplateParamsArg TempParams) { 10122 SourceLocation Loc = DS.getLocStart(); 10123 10124 assert(DS.isFriendSpecified()); 10125 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10126 10127 // Try to convert the decl specifier to a type. This works for 10128 // friend templates because ActOnTag never produces a ClassTemplateDecl 10129 // for a TUK_Friend. 10130 Declarator TheDeclarator(DS, Declarator::MemberContext); 10131 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10132 QualType T = TSI->getType(); 10133 if (TheDeclarator.isInvalidType()) 10134 return 0; 10135 10136 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10137 return 0; 10138 10139 // This is definitely an error in C++98. It's probably meant to 10140 // be forbidden in C++0x, too, but the specification is just 10141 // poorly written. 10142 // 10143 // The problem is with declarations like the following: 10144 // template <T> friend A<T>::foo; 10145 // where deciding whether a class C is a friend or not now hinges 10146 // on whether there exists an instantiation of A that causes 10147 // 'foo' to equal C. There are restrictions on class-heads 10148 // (which we declare (by fiat) elaborated friend declarations to 10149 // be) that makes this tractable. 10150 // 10151 // FIXME: handle "template <> friend class A<T>;", which 10152 // is possibly well-formed? Who even knows? 10153 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10154 Diag(Loc, diag::err_tagless_friend_type_template) 10155 << DS.getSourceRange(); 10156 return 0; 10157 } 10158 10159 // C++98 [class.friend]p1: A friend of a class is a function 10160 // or class that is not a member of the class . . . 10161 // This is fixed in DR77, which just barely didn't make the C++03 10162 // deadline. It's also a very silly restriction that seriously 10163 // affects inner classes and which nobody else seems to implement; 10164 // thus we never diagnose it, not even in -pedantic. 10165 // 10166 // But note that we could warn about it: it's always useless to 10167 // friend one of your own members (it's not, however, worthless to 10168 // friend a member of an arbitrary specialization of your template). 10169 10170 Decl *D; 10171 if (unsigned NumTempParamLists = TempParams.size()) 10172 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10173 NumTempParamLists, 10174 TempParams.release(), 10175 TSI, 10176 DS.getFriendSpecLoc()); 10177 else 10178 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10179 10180 if (!D) 10181 return 0; 10182 10183 D->setAccess(AS_public); 10184 CurContext->addDecl(D); 10185 10186 return D; 10187} 10188 10189Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10190 MultiTemplateParamsArg TemplateParams) { 10191 const DeclSpec &DS = D.getDeclSpec(); 10192 10193 assert(DS.isFriendSpecified()); 10194 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10195 10196 SourceLocation Loc = D.getIdentifierLoc(); 10197 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10198 10199 // C++ [class.friend]p1 10200 // A friend of a class is a function or class.... 10201 // Note that this sees through typedefs, which is intended. 10202 // It *doesn't* see through dependent types, which is correct 10203 // according to [temp.arg.type]p3: 10204 // If a declaration acquires a function type through a 10205 // type dependent on a template-parameter and this causes 10206 // a declaration that does not use the syntactic form of a 10207 // function declarator to have a function type, the program 10208 // is ill-formed. 10209 if (!TInfo->getType()->isFunctionType()) { 10210 Diag(Loc, diag::err_unexpected_friend); 10211 10212 // It might be worthwhile to try to recover by creating an 10213 // appropriate declaration. 10214 return 0; 10215 } 10216 10217 // C++ [namespace.memdef]p3 10218 // - If a friend declaration in a non-local class first declares a 10219 // class or function, the friend class or function is a member 10220 // of the innermost enclosing namespace. 10221 // - The name of the friend is not found by simple name lookup 10222 // until a matching declaration is provided in that namespace 10223 // scope (either before or after the class declaration granting 10224 // friendship). 10225 // - If a friend function is called, its name may be found by the 10226 // name lookup that considers functions from namespaces and 10227 // classes associated with the types of the function arguments. 10228 // - When looking for a prior declaration of a class or a function 10229 // declared as a friend, scopes outside the innermost enclosing 10230 // namespace scope are not considered. 10231 10232 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10233 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10234 DeclarationName Name = NameInfo.getName(); 10235 assert(Name); 10236 10237 // Check for unexpanded parameter packs. 10238 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10239 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10240 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10241 return 0; 10242 10243 // The context we found the declaration in, or in which we should 10244 // create the declaration. 10245 DeclContext *DC; 10246 Scope *DCScope = S; 10247 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10248 ForRedeclaration); 10249 10250 // FIXME: there are different rules in local classes 10251 10252 // There are four cases here. 10253 // - There's no scope specifier, in which case we just go to the 10254 // appropriate scope and look for a function or function template 10255 // there as appropriate. 10256 // Recover from invalid scope qualifiers as if they just weren't there. 10257 if (SS.isInvalid() || !SS.isSet()) { 10258 // C++0x [namespace.memdef]p3: 10259 // If the name in a friend declaration is neither qualified nor 10260 // a template-id and the declaration is a function or an 10261 // elaborated-type-specifier, the lookup to determine whether 10262 // the entity has been previously declared shall not consider 10263 // any scopes outside the innermost enclosing namespace. 10264 // C++0x [class.friend]p11: 10265 // If a friend declaration appears in a local class and the name 10266 // specified is an unqualified name, a prior declaration is 10267 // looked up without considering scopes that are outside the 10268 // innermost enclosing non-class scope. For a friend function 10269 // declaration, if there is no prior declaration, the program is 10270 // ill-formed. 10271 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10272 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10273 10274 // Find the appropriate context according to the above. 10275 DC = CurContext; 10276 while (true) { 10277 // Skip class contexts. If someone can cite chapter and verse 10278 // for this behavior, that would be nice --- it's what GCC and 10279 // EDG do, and it seems like a reasonable intent, but the spec 10280 // really only says that checks for unqualified existing 10281 // declarations should stop at the nearest enclosing namespace, 10282 // not that they should only consider the nearest enclosing 10283 // namespace. 10284 while (DC->isRecord() || DC->isTransparentContext()) 10285 DC = DC->getParent(); 10286 10287 LookupQualifiedName(Previous, DC); 10288 10289 // TODO: decide what we think about using declarations. 10290 if (isLocal || !Previous.empty()) 10291 break; 10292 10293 if (isTemplateId) { 10294 if (isa<TranslationUnitDecl>(DC)) break; 10295 } else { 10296 if (DC->isFileContext()) break; 10297 } 10298 DC = DC->getParent(); 10299 } 10300 10301 // C++ [class.friend]p1: A friend of a class is a function or 10302 // class that is not a member of the class . . . 10303 // C++11 changes this for both friend types and functions. 10304 // Most C++ 98 compilers do seem to give an error here, so 10305 // we do, too. 10306 if (!Previous.empty() && DC->Equals(CurContext)) 10307 Diag(DS.getFriendSpecLoc(), 10308 getLangOpts().CPlusPlus0x ? 10309 diag::warn_cxx98_compat_friend_is_member : 10310 diag::err_friend_is_member); 10311 10312 DCScope = getScopeForDeclContext(S, DC); 10313 10314 // C++ [class.friend]p6: 10315 // A function can be defined in a friend declaration of a class if and 10316 // only if the class is a non-local class (9.8), the function name is 10317 // unqualified, and the function has namespace scope. 10318 if (isLocal && D.isFunctionDefinition()) { 10319 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10320 } 10321 10322 // - There's a non-dependent scope specifier, in which case we 10323 // compute it and do a previous lookup there for a function 10324 // or function template. 10325 } else if (!SS.getScopeRep()->isDependent()) { 10326 DC = computeDeclContext(SS); 10327 if (!DC) return 0; 10328 10329 if (RequireCompleteDeclContext(SS, DC)) return 0; 10330 10331 LookupQualifiedName(Previous, DC); 10332 10333 // Ignore things found implicitly in the wrong scope. 10334 // TODO: better diagnostics for this case. Suggesting the right 10335 // qualified scope would be nice... 10336 LookupResult::Filter F = Previous.makeFilter(); 10337 while (F.hasNext()) { 10338 NamedDecl *D = F.next(); 10339 if (!DC->InEnclosingNamespaceSetOf( 10340 D->getDeclContext()->getRedeclContext())) 10341 F.erase(); 10342 } 10343 F.done(); 10344 10345 if (Previous.empty()) { 10346 D.setInvalidType(); 10347 Diag(Loc, diag::err_qualified_friend_not_found) 10348 << Name << TInfo->getType(); 10349 return 0; 10350 } 10351 10352 // C++ [class.friend]p1: A friend of a class is a function or 10353 // class that is not a member of the class . . . 10354 if (DC->Equals(CurContext)) 10355 Diag(DS.getFriendSpecLoc(), 10356 getLangOpts().CPlusPlus0x ? 10357 diag::warn_cxx98_compat_friend_is_member : 10358 diag::err_friend_is_member); 10359 10360 if (D.isFunctionDefinition()) { 10361 // C++ [class.friend]p6: 10362 // A function can be defined in a friend declaration of a class if and 10363 // only if the class is a non-local class (9.8), the function name is 10364 // unqualified, and the function has namespace scope. 10365 SemaDiagnosticBuilder DB 10366 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10367 10368 DB << SS.getScopeRep(); 10369 if (DC->isFileContext()) 10370 DB << FixItHint::CreateRemoval(SS.getRange()); 10371 SS.clear(); 10372 } 10373 10374 // - There's a scope specifier that does not match any template 10375 // parameter lists, in which case we use some arbitrary context, 10376 // create a method or method template, and wait for instantiation. 10377 // - There's a scope specifier that does match some template 10378 // parameter lists, which we don't handle right now. 10379 } else { 10380 if (D.isFunctionDefinition()) { 10381 // C++ [class.friend]p6: 10382 // A function can be defined in a friend declaration of a class if and 10383 // only if the class is a non-local class (9.8), the function name is 10384 // unqualified, and the function has namespace scope. 10385 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10386 << SS.getScopeRep(); 10387 } 10388 10389 DC = CurContext; 10390 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10391 } 10392 10393 if (!DC->isRecord()) { 10394 // This implies that it has to be an operator or function. 10395 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10396 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10397 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10398 Diag(Loc, diag::err_introducing_special_friend) << 10399 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10400 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10401 return 0; 10402 } 10403 } 10404 10405 // FIXME: This is an egregious hack to cope with cases where the scope stack 10406 // does not contain the declaration context, i.e., in an out-of-line 10407 // definition of a class. 10408 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10409 if (!DCScope) { 10410 FakeDCScope.setEntity(DC); 10411 DCScope = &FakeDCScope; 10412 } 10413 10414 bool AddToScope = true; 10415 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10416 move(TemplateParams), AddToScope); 10417 if (!ND) return 0; 10418 10419 assert(ND->getDeclContext() == DC); 10420 assert(ND->getLexicalDeclContext() == CurContext); 10421 10422 // Add the function declaration to the appropriate lookup tables, 10423 // adjusting the redeclarations list as necessary. We don't 10424 // want to do this yet if the friending class is dependent. 10425 // 10426 // Also update the scope-based lookup if the target context's 10427 // lookup context is in lexical scope. 10428 if (!CurContext->isDependentContext()) { 10429 DC = DC->getRedeclContext(); 10430 DC->makeDeclVisibleInContext(ND); 10431 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10432 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10433 } 10434 10435 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10436 D.getIdentifierLoc(), ND, 10437 DS.getFriendSpecLoc()); 10438 FrD->setAccess(AS_public); 10439 CurContext->addDecl(FrD); 10440 10441 if (ND->isInvalidDecl()) 10442 FrD->setInvalidDecl(); 10443 else { 10444 FunctionDecl *FD; 10445 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10446 FD = FTD->getTemplatedDecl(); 10447 else 10448 FD = cast<FunctionDecl>(ND); 10449 10450 // Mark templated-scope function declarations as unsupported. 10451 if (FD->getNumTemplateParameterLists()) 10452 FrD->setUnsupportedFriend(true); 10453 } 10454 10455 return ND; 10456} 10457 10458void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10459 AdjustDeclIfTemplate(Dcl); 10460 10461 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10462 if (!Fn) { 10463 Diag(DelLoc, diag::err_deleted_non_function); 10464 return; 10465 } 10466 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10467 Diag(DelLoc, diag::err_deleted_decl_not_first); 10468 Diag(Prev->getLocation(), diag::note_previous_declaration); 10469 // If the declaration wasn't the first, we delete the function anyway for 10470 // recovery. 10471 } 10472 Fn->setDeletedAsWritten(); 10473 10474 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10475 if (!MD) 10476 return; 10477 10478 // A deleted special member function is trivial if the corresponding 10479 // implicitly-declared function would have been. 10480 switch (getSpecialMember(MD)) { 10481 case CXXInvalid: 10482 break; 10483 case CXXDefaultConstructor: 10484 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10485 break; 10486 case CXXCopyConstructor: 10487 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10488 break; 10489 case CXXMoveConstructor: 10490 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10491 break; 10492 case CXXCopyAssignment: 10493 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10494 break; 10495 case CXXMoveAssignment: 10496 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10497 break; 10498 case CXXDestructor: 10499 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10500 break; 10501 } 10502} 10503 10504void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10505 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10506 10507 if (MD) { 10508 if (MD->getParent()->isDependentType()) { 10509 MD->setDefaulted(); 10510 MD->setExplicitlyDefaulted(); 10511 return; 10512 } 10513 10514 CXXSpecialMember Member = getSpecialMember(MD); 10515 if (Member == CXXInvalid) { 10516 Diag(DefaultLoc, diag::err_default_special_members); 10517 return; 10518 } 10519 10520 MD->setDefaulted(); 10521 MD->setExplicitlyDefaulted(); 10522 10523 // If this definition appears within the record, do the checking when 10524 // the record is complete. 10525 const FunctionDecl *Primary = MD; 10526 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10527 // Find the uninstantiated declaration that actually had the '= default' 10528 // on it. 10529 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10530 10531 if (Primary == Primary->getCanonicalDecl()) 10532 return; 10533 10534 switch (Member) { 10535 case CXXDefaultConstructor: { 10536 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10537 CheckExplicitlyDefaultedDefaultConstructor(CD); 10538 if (!CD->isInvalidDecl()) 10539 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10540 break; 10541 } 10542 10543 case CXXCopyConstructor: { 10544 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10545 CheckExplicitlyDefaultedCopyConstructor(CD); 10546 if (!CD->isInvalidDecl()) 10547 DefineImplicitCopyConstructor(DefaultLoc, CD); 10548 break; 10549 } 10550 10551 case CXXCopyAssignment: { 10552 CheckExplicitlyDefaultedCopyAssignment(MD); 10553 if (!MD->isInvalidDecl()) 10554 DefineImplicitCopyAssignment(DefaultLoc, MD); 10555 break; 10556 } 10557 10558 case CXXDestructor: { 10559 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10560 CheckExplicitlyDefaultedDestructor(DD); 10561 if (!DD->isInvalidDecl()) 10562 DefineImplicitDestructor(DefaultLoc, DD); 10563 break; 10564 } 10565 10566 case CXXMoveConstructor: { 10567 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10568 CheckExplicitlyDefaultedMoveConstructor(CD); 10569 if (!CD->isInvalidDecl()) 10570 DefineImplicitMoveConstructor(DefaultLoc, CD); 10571 break; 10572 } 10573 10574 case CXXMoveAssignment: { 10575 CheckExplicitlyDefaultedMoveAssignment(MD); 10576 if (!MD->isInvalidDecl()) 10577 DefineImplicitMoveAssignment(DefaultLoc, MD); 10578 break; 10579 } 10580 10581 case CXXInvalid: 10582 llvm_unreachable("Invalid special member."); 10583 } 10584 } else { 10585 Diag(DefaultLoc, diag::err_default_special_members); 10586 } 10587} 10588 10589static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10590 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10591 Stmt *SubStmt = *CI; 10592 if (!SubStmt) 10593 continue; 10594 if (isa<ReturnStmt>(SubStmt)) 10595 Self.Diag(SubStmt->getLocStart(), 10596 diag::err_return_in_constructor_handler); 10597 if (!isa<Expr>(SubStmt)) 10598 SearchForReturnInStmt(Self, SubStmt); 10599 } 10600} 10601 10602void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10603 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10604 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10605 SearchForReturnInStmt(*this, Handler); 10606 } 10607} 10608 10609bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10610 const CXXMethodDecl *Old) { 10611 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10612 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10613 10614 if (Context.hasSameType(NewTy, OldTy) || 10615 NewTy->isDependentType() || OldTy->isDependentType()) 10616 return false; 10617 10618 // Check if the return types are covariant 10619 QualType NewClassTy, OldClassTy; 10620 10621 /// Both types must be pointers or references to classes. 10622 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10623 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10624 NewClassTy = NewPT->getPointeeType(); 10625 OldClassTy = OldPT->getPointeeType(); 10626 } 10627 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10628 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10629 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10630 NewClassTy = NewRT->getPointeeType(); 10631 OldClassTy = OldRT->getPointeeType(); 10632 } 10633 } 10634 } 10635 10636 // The return types aren't either both pointers or references to a class type. 10637 if (NewClassTy.isNull()) { 10638 Diag(New->getLocation(), 10639 diag::err_different_return_type_for_overriding_virtual_function) 10640 << New->getDeclName() << NewTy << OldTy; 10641 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10642 10643 return true; 10644 } 10645 10646 // C++ [class.virtual]p6: 10647 // If the return type of D::f differs from the return type of B::f, the 10648 // class type in the return type of D::f shall be complete at the point of 10649 // declaration of D::f or shall be the class type D. 10650 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10651 if (!RT->isBeingDefined() && 10652 RequireCompleteType(New->getLocation(), NewClassTy, 10653 PDiag(diag::err_covariant_return_incomplete) 10654 << New->getDeclName())) 10655 return true; 10656 } 10657 10658 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10659 // Check if the new class derives from the old class. 10660 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10661 Diag(New->getLocation(), 10662 diag::err_covariant_return_not_derived) 10663 << New->getDeclName() << NewTy << OldTy; 10664 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10665 return true; 10666 } 10667 10668 // Check if we the conversion from derived to base is valid. 10669 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10670 diag::err_covariant_return_inaccessible_base, 10671 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10672 // FIXME: Should this point to the return type? 10673 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10674 // FIXME: this note won't trigger for delayed access control 10675 // diagnostics, and it's impossible to get an undelayed error 10676 // here from access control during the original parse because 10677 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10678 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10679 return true; 10680 } 10681 } 10682 10683 // The qualifiers of the return types must be the same. 10684 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10685 Diag(New->getLocation(), 10686 diag::err_covariant_return_type_different_qualifications) 10687 << New->getDeclName() << NewTy << OldTy; 10688 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10689 return true; 10690 }; 10691 10692 10693 // The new class type must have the same or less qualifiers as the old type. 10694 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10695 Diag(New->getLocation(), 10696 diag::err_covariant_return_type_class_type_more_qualified) 10697 << New->getDeclName() << NewTy << OldTy; 10698 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10699 return true; 10700 }; 10701 10702 return false; 10703} 10704 10705/// \brief Mark the given method pure. 10706/// 10707/// \param Method the method to be marked pure. 10708/// 10709/// \param InitRange the source range that covers the "0" initializer. 10710bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10711 SourceLocation EndLoc = InitRange.getEnd(); 10712 if (EndLoc.isValid()) 10713 Method->setRangeEnd(EndLoc); 10714 10715 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10716 Method->setPure(); 10717 return false; 10718 } 10719 10720 if (!Method->isInvalidDecl()) 10721 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10722 << Method->getDeclName() << InitRange; 10723 return true; 10724} 10725 10726/// \brief Determine whether the given declaration is a static data member. 10727static bool isStaticDataMember(Decl *D) { 10728 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10729 if (!Var) 10730 return false; 10731 10732 return Var->isStaticDataMember(); 10733} 10734/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10735/// an initializer for the out-of-line declaration 'Dcl'. The scope 10736/// is a fresh scope pushed for just this purpose. 10737/// 10738/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10739/// static data member of class X, names should be looked up in the scope of 10740/// class X. 10741void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10742 // If there is no declaration, there was an error parsing it. 10743 if (D == 0 || D->isInvalidDecl()) return; 10744 10745 // We should only get called for declarations with scope specifiers, like: 10746 // int foo::bar; 10747 assert(D->isOutOfLine()); 10748 EnterDeclaratorContext(S, D->getDeclContext()); 10749 10750 // If we are parsing the initializer for a static data member, push a 10751 // new expression evaluation context that is associated with this static 10752 // data member. 10753 if (isStaticDataMember(D)) 10754 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10755} 10756 10757/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10758/// initializer for the out-of-line declaration 'D'. 10759void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10760 // If there is no declaration, there was an error parsing it. 10761 if (D == 0 || D->isInvalidDecl()) return; 10762 10763 if (isStaticDataMember(D)) 10764 PopExpressionEvaluationContext(); 10765 10766 assert(D->isOutOfLine()); 10767 ExitDeclaratorContext(S); 10768} 10769 10770/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10771/// C++ if/switch/while/for statement. 10772/// e.g: "if (int x = f()) {...}" 10773DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10774 // C++ 6.4p2: 10775 // The declarator shall not specify a function or an array. 10776 // The type-specifier-seq shall not contain typedef and shall not declare a 10777 // new class or enumeration. 10778 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10779 "Parser allowed 'typedef' as storage class of condition decl."); 10780 10781 Decl *Dcl = ActOnDeclarator(S, D); 10782 if (!Dcl) 10783 return true; 10784 10785 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10786 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10787 << D.getSourceRange(); 10788 return true; 10789 } 10790 10791 return Dcl; 10792} 10793 10794void Sema::LoadExternalVTableUses() { 10795 if (!ExternalSource) 10796 return; 10797 10798 SmallVector<ExternalVTableUse, 4> VTables; 10799 ExternalSource->ReadUsedVTables(VTables); 10800 SmallVector<VTableUse, 4> NewUses; 10801 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10802 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10803 = VTablesUsed.find(VTables[I].Record); 10804 // Even if a definition wasn't required before, it may be required now. 10805 if (Pos != VTablesUsed.end()) { 10806 if (!Pos->second && VTables[I].DefinitionRequired) 10807 Pos->second = true; 10808 continue; 10809 } 10810 10811 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10812 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10813 } 10814 10815 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10816} 10817 10818void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10819 bool DefinitionRequired) { 10820 // Ignore any vtable uses in unevaluated operands or for classes that do 10821 // not have a vtable. 10822 if (!Class->isDynamicClass() || Class->isDependentContext() || 10823 CurContext->isDependentContext() || 10824 ExprEvalContexts.back().Context == Unevaluated) 10825 return; 10826 10827 // Try to insert this class into the map. 10828 LoadExternalVTableUses(); 10829 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10830 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10831 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10832 if (!Pos.second) { 10833 // If we already had an entry, check to see if we are promoting this vtable 10834 // to required a definition. If so, we need to reappend to the VTableUses 10835 // list, since we may have already processed the first entry. 10836 if (DefinitionRequired && !Pos.first->second) { 10837 Pos.first->second = true; 10838 } else { 10839 // Otherwise, we can early exit. 10840 return; 10841 } 10842 } 10843 10844 // Local classes need to have their virtual members marked 10845 // immediately. For all other classes, we mark their virtual members 10846 // at the end of the translation unit. 10847 if (Class->isLocalClass()) 10848 MarkVirtualMembersReferenced(Loc, Class); 10849 else 10850 VTableUses.push_back(std::make_pair(Class, Loc)); 10851} 10852 10853bool Sema::DefineUsedVTables() { 10854 LoadExternalVTableUses(); 10855 if (VTableUses.empty()) 10856 return false; 10857 10858 // Note: The VTableUses vector could grow as a result of marking 10859 // the members of a class as "used", so we check the size each 10860 // time through the loop and prefer indices (with are stable) to 10861 // iterators (which are not). 10862 bool DefinedAnything = false; 10863 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10864 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10865 if (!Class) 10866 continue; 10867 10868 SourceLocation Loc = VTableUses[I].second; 10869 10870 // If this class has a key function, but that key function is 10871 // defined in another translation unit, we don't need to emit the 10872 // vtable even though we're using it. 10873 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10874 if (KeyFunction && !KeyFunction->hasBody()) { 10875 switch (KeyFunction->getTemplateSpecializationKind()) { 10876 case TSK_Undeclared: 10877 case TSK_ExplicitSpecialization: 10878 case TSK_ExplicitInstantiationDeclaration: 10879 // The key function is in another translation unit. 10880 continue; 10881 10882 case TSK_ExplicitInstantiationDefinition: 10883 case TSK_ImplicitInstantiation: 10884 // We will be instantiating the key function. 10885 break; 10886 } 10887 } else if (!KeyFunction) { 10888 // If we have a class with no key function that is the subject 10889 // of an explicit instantiation declaration, suppress the 10890 // vtable; it will live with the explicit instantiation 10891 // definition. 10892 bool IsExplicitInstantiationDeclaration 10893 = Class->getTemplateSpecializationKind() 10894 == TSK_ExplicitInstantiationDeclaration; 10895 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10896 REnd = Class->redecls_end(); 10897 R != REnd; ++R) { 10898 TemplateSpecializationKind TSK 10899 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10900 if (TSK == TSK_ExplicitInstantiationDeclaration) 10901 IsExplicitInstantiationDeclaration = true; 10902 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10903 IsExplicitInstantiationDeclaration = false; 10904 break; 10905 } 10906 } 10907 10908 if (IsExplicitInstantiationDeclaration) 10909 continue; 10910 } 10911 10912 // Mark all of the virtual members of this class as referenced, so 10913 // that we can build a vtable. Then, tell the AST consumer that a 10914 // vtable for this class is required. 10915 DefinedAnything = true; 10916 MarkVirtualMembersReferenced(Loc, Class); 10917 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10918 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10919 10920 // Optionally warn if we're emitting a weak vtable. 10921 if (Class->getLinkage() == ExternalLinkage && 10922 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10923 const FunctionDecl *KeyFunctionDef = 0; 10924 if (!KeyFunction || 10925 (KeyFunction->hasBody(KeyFunctionDef) && 10926 KeyFunctionDef->isInlined())) 10927 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10928 TSK_ExplicitInstantiationDefinition 10929 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10930 << Class; 10931 } 10932 } 10933 VTableUses.clear(); 10934 10935 return DefinedAnything; 10936} 10937 10938void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10939 const CXXRecordDecl *RD) { 10940 // Mark all functions which will appear in RD's vtable as used. 10941 CXXFinalOverriderMap FinalOverriders; 10942 RD->getFinalOverriders(FinalOverriders); 10943 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 10944 E = FinalOverriders.end(); 10945 I != E; ++I) { 10946 for (OverridingMethods::const_iterator OI = I->second.begin(), 10947 OE = I->second.end(); 10948 OI != OE; ++OI) { 10949 assert(OI->second.size() > 0 && "no final overrider"); 10950 CXXMethodDecl *Overrider = OI->second.front().Method; 10951 10952 // C++ [basic.def.odr]p2: 10953 // [...] A virtual member function is used if it is not pure. [...] 10954 if (!Overrider->isPure()) 10955 MarkFunctionReferenced(Loc, Overrider); 10956 } 10957 } 10958 10959 // Only classes that have virtual bases need a VTT. 10960 if (RD->getNumVBases() == 0) 10961 return; 10962 10963 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10964 e = RD->bases_end(); i != e; ++i) { 10965 const CXXRecordDecl *Base = 10966 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10967 if (Base->getNumVBases() == 0) 10968 continue; 10969 MarkVirtualMembersReferenced(Loc, Base); 10970 } 10971} 10972 10973/// SetIvarInitializers - This routine builds initialization ASTs for the 10974/// Objective-C implementation whose ivars need be initialized. 10975void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10976 if (!getLangOpts().CPlusPlus) 10977 return; 10978 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10979 SmallVector<ObjCIvarDecl*, 8> ivars; 10980 CollectIvarsToConstructOrDestruct(OID, ivars); 10981 if (ivars.empty()) 10982 return; 10983 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10984 for (unsigned i = 0; i < ivars.size(); i++) { 10985 FieldDecl *Field = ivars[i]; 10986 if (Field->isInvalidDecl()) 10987 continue; 10988 10989 CXXCtorInitializer *Member; 10990 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10991 InitializationKind InitKind = 10992 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10993 10994 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10995 ExprResult MemberInit = 10996 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10997 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10998 // Note, MemberInit could actually come back empty if no initialization 10999 // is required (e.g., because it would call a trivial default constructor) 11000 if (!MemberInit.get() || MemberInit.isInvalid()) 11001 continue; 11002 11003 Member = 11004 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 11005 SourceLocation(), 11006 MemberInit.takeAs<Expr>(), 11007 SourceLocation()); 11008 AllToInit.push_back(Member); 11009 11010 // Be sure that the destructor is accessible and is marked as referenced. 11011 if (const RecordType *RecordTy 11012 = Context.getBaseElementType(Field->getType()) 11013 ->getAs<RecordType>()) { 11014 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 11015 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 11016 MarkFunctionReferenced(Field->getLocation(), Destructor); 11017 CheckDestructorAccess(Field->getLocation(), Destructor, 11018 PDiag(diag::err_access_dtor_ivar) 11019 << Context.getBaseElementType(Field->getType())); 11020 } 11021 } 11022 } 11023 ObjCImplementation->setIvarInitializers(Context, 11024 AllToInit.data(), AllToInit.size()); 11025 } 11026} 11027 11028static 11029void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 11030 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 11031 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 11032 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 11033 Sema &S) { 11034 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11035 CE = Current.end(); 11036 if (Ctor->isInvalidDecl()) 11037 return; 11038 11039 const FunctionDecl *FNTarget = 0; 11040 CXXConstructorDecl *Target; 11041 11042 // We ignore the result here since if we don't have a body, Target will be 11043 // null below. 11044 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 11045 Target 11046= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 11047 11048 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 11049 // Avoid dereferencing a null pointer here. 11050 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 11051 11052 if (!Current.insert(Canonical)) 11053 return; 11054 11055 // We know that beyond here, we aren't chaining into a cycle. 11056 if (!Target || !Target->isDelegatingConstructor() || 11057 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11058 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11059 Valid.insert(*CI); 11060 Current.clear(); 11061 // We've hit a cycle. 11062 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11063 Current.count(TCanonical)) { 11064 // If we haven't diagnosed this cycle yet, do so now. 11065 if (!Invalid.count(TCanonical)) { 11066 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11067 diag::warn_delegating_ctor_cycle) 11068 << Ctor; 11069 11070 // Don't add a note for a function delegating directo to itself. 11071 if (TCanonical != Canonical) 11072 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11073 11074 CXXConstructorDecl *C = Target; 11075 while (C->getCanonicalDecl() != Canonical) { 11076 (void)C->getTargetConstructor()->hasBody(FNTarget); 11077 assert(FNTarget && "Ctor cycle through bodiless function"); 11078 11079 C 11080 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 11081 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11082 } 11083 } 11084 11085 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11086 Invalid.insert(*CI); 11087 Current.clear(); 11088 } else { 11089 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11090 } 11091} 11092 11093 11094void Sema::CheckDelegatingCtorCycles() { 11095 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11096 11097 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11098 CE = Current.end(); 11099 11100 for (DelegatingCtorDeclsType::iterator 11101 I = DelegatingCtorDecls.begin(ExternalSource), 11102 E = DelegatingCtorDecls.end(); 11103 I != E; ++I) { 11104 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11105 } 11106 11107 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11108 (*CI)->setInvalidDecl(); 11109} 11110 11111namespace { 11112 /// \brief AST visitor that finds references to the 'this' expression. 11113 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11114 Sema &S; 11115 11116 public: 11117 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11118 11119 bool VisitCXXThisExpr(CXXThisExpr *E) { 11120 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11121 << E->isImplicit(); 11122 return false; 11123 } 11124 }; 11125} 11126 11127bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11128 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11129 if (!TSInfo) 11130 return false; 11131 11132 TypeLoc TL = TSInfo->getTypeLoc(); 11133 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11134 if (!ProtoTL) 11135 return false; 11136 11137 // C++11 [expr.prim.general]p3: 11138 // [The expression this] shall not appear before the optional 11139 // cv-qualifier-seq and it shall not appear within the declaration of a 11140 // static member function (although its type and value category are defined 11141 // within a static member function as they are within a non-static member 11142 // function). [ Note: this is because declaration matching does not occur 11143 // until the complete declarator is known. - end note ] 11144 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11145 FindCXXThisExpr Finder(*this); 11146 11147 // If the return type came after the cv-qualifier-seq, check it now. 11148 if (Proto->hasTrailingReturn() && 11149 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 11150 return true; 11151 11152 // Check the exception specification. 11153 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11154 return true; 11155 11156 return checkThisInStaticMemberFunctionAttributes(Method); 11157} 11158 11159bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11160 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11161 if (!TSInfo) 11162 return false; 11163 11164 TypeLoc TL = TSInfo->getTypeLoc(); 11165 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11166 if (!ProtoTL) 11167 return false; 11168 11169 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11170 FindCXXThisExpr Finder(*this); 11171 11172 switch (Proto->getExceptionSpecType()) { 11173 case EST_Uninstantiated: 11174 case EST_BasicNoexcept: 11175 case EST_Delayed: 11176 case EST_DynamicNone: 11177 case EST_MSAny: 11178 case EST_None: 11179 break; 11180 11181 case EST_ComputedNoexcept: 11182 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11183 return true; 11184 11185 case EST_Dynamic: 11186 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11187 EEnd = Proto->exception_end(); 11188 E != EEnd; ++E) { 11189 if (!Finder.TraverseType(*E)) 11190 return true; 11191 } 11192 break; 11193 } 11194 11195 return false; 11196} 11197 11198bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11199 FindCXXThisExpr Finder(*this); 11200 11201 // Check attributes. 11202 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11203 A != AEnd; ++A) { 11204 // FIXME: This should be emitted by tblgen. 11205 Expr *Arg = 0; 11206 ArrayRef<Expr *> Args; 11207 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11208 Arg = G->getArg(); 11209 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11210 Arg = G->getArg(); 11211 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11212 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11213 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11214 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11215 else if (ExclusiveLockFunctionAttr *ELF 11216 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11217 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11218 else if (SharedLockFunctionAttr *SLF 11219 = dyn_cast<SharedLockFunctionAttr>(*A)) 11220 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11221 else if (ExclusiveTrylockFunctionAttr *ETLF 11222 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11223 Arg = ETLF->getSuccessValue(); 11224 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11225 } else if (SharedTrylockFunctionAttr *STLF 11226 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11227 Arg = STLF->getSuccessValue(); 11228 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11229 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11230 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11231 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11232 Arg = LR->getArg(); 11233 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11234 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11235 else if (ExclusiveLocksRequiredAttr *ELR 11236 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11237 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11238 else if (SharedLocksRequiredAttr *SLR 11239 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11240 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11241 11242 if (Arg && !Finder.TraverseStmt(Arg)) 11243 return true; 11244 11245 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11246 if (!Finder.TraverseStmt(Args[I])) 11247 return true; 11248 } 11249 } 11250 11251 return false; 11252} 11253 11254void 11255Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11256 ArrayRef<ParsedType> DynamicExceptions, 11257 ArrayRef<SourceRange> DynamicExceptionRanges, 11258 Expr *NoexceptExpr, 11259 llvm::SmallVectorImpl<QualType> &Exceptions, 11260 FunctionProtoType::ExtProtoInfo &EPI) { 11261 Exceptions.clear(); 11262 EPI.ExceptionSpecType = EST; 11263 if (EST == EST_Dynamic) { 11264 Exceptions.reserve(DynamicExceptions.size()); 11265 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11266 // FIXME: Preserve type source info. 11267 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11268 11269 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11270 collectUnexpandedParameterPacks(ET, Unexpanded); 11271 if (!Unexpanded.empty()) { 11272 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11273 UPPC_ExceptionType, 11274 Unexpanded); 11275 continue; 11276 } 11277 11278 // Check that the type is valid for an exception spec, and 11279 // drop it if not. 11280 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11281 Exceptions.push_back(ET); 11282 } 11283 EPI.NumExceptions = Exceptions.size(); 11284 EPI.Exceptions = Exceptions.data(); 11285 return; 11286 } 11287 11288 if (EST == EST_ComputedNoexcept) { 11289 // If an error occurred, there's no expression here. 11290 if (NoexceptExpr) { 11291 assert((NoexceptExpr->isTypeDependent() || 11292 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11293 Context.BoolTy) && 11294 "Parser should have made sure that the expression is boolean"); 11295 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11296 EPI.ExceptionSpecType = EST_BasicNoexcept; 11297 return; 11298 } 11299 11300 if (!NoexceptExpr->isValueDependent()) 11301 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11302 PDiag(diag::err_noexcept_needs_constant_expression), 11303 /*AllowFold*/ false).take(); 11304 EPI.NoexceptExpr = NoexceptExpr; 11305 } 11306 return; 11307 } 11308} 11309 11310/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11311Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11312 // Implicitly declared functions (e.g. copy constructors) are 11313 // __host__ __device__ 11314 if (D->isImplicit()) 11315 return CFT_HostDevice; 11316 11317 if (D->hasAttr<CUDAGlobalAttr>()) 11318 return CFT_Global; 11319 11320 if (D->hasAttr<CUDADeviceAttr>()) { 11321 if (D->hasAttr<CUDAHostAttr>()) 11322 return CFT_HostDevice; 11323 else 11324 return CFT_Device; 11325 } 11326 11327 return CFT_Host; 11328} 11329 11330bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11331 CUDAFunctionTarget CalleeTarget) { 11332 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11333 // Callable from the device only." 11334 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11335 return true; 11336 11337 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11338 // Callable from the host only." 11339 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11340 // Callable from the host only." 11341 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11342 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11343 return true; 11344 11345 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11346 return true; 11347 11348 return false; 11349} 11350